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/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "nfs4idmap.h" 67 #include "nfs4session.h" 68 #include "fscache.h" 69 #include "nfs42.h" 70 71 #include "nfs4trace.h" 72 73 #define NFSDBG_FACILITY NFSDBG_PROC 74 75 #define NFS4_BITMASK_SZ 3 76 77 #define NFS4_POLL_RETRY_MIN (HZ/10) 78 #define NFS4_POLL_RETRY_MAX (15*HZ) 79 80 /* file attributes which can be mapped to nfs attributes */ 81 #define NFS4_VALID_ATTRS (ATTR_MODE \ 82 | ATTR_UID \ 83 | ATTR_GID \ 84 | ATTR_SIZE \ 85 | ATTR_ATIME \ 86 | ATTR_MTIME \ 87 | ATTR_CTIME \ 88 | ATTR_ATIME_SET \ 89 | ATTR_MTIME_SET) 90 91 struct nfs4_opendata; 92 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 93 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 94 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 95 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode); 96 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 97 struct nfs_fattr *fattr, struct iattr *sattr, 98 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 99 struct nfs4_label *olabel); 100 #ifdef CONFIG_NFS_V4_1 101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 102 const struct cred *cred, 103 struct nfs4_slot *slot, 104 bool is_privileged); 105 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 106 const struct cred *); 107 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 108 const struct cred *, bool); 109 #endif 110 111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 112 static inline struct nfs4_label * 113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 114 struct iattr *sattr, struct nfs4_label *label) 115 { 116 int err; 117 118 if (label == NULL) 119 return NULL; 120 121 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 122 return NULL; 123 124 err = security_dentry_init_security(dentry, sattr->ia_mode, 125 &dentry->d_name, (void **)&label->label, &label->len); 126 if (err == 0) 127 return label; 128 129 return NULL; 130 } 131 static inline void 132 nfs4_label_release_security(struct nfs4_label *label) 133 { 134 if (label) 135 security_release_secctx(label->label, label->len); 136 } 137 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 138 { 139 if (label) 140 return server->attr_bitmask; 141 142 return server->attr_bitmask_nl; 143 } 144 #else 145 static inline struct nfs4_label * 146 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 147 struct iattr *sattr, struct nfs4_label *l) 148 { return NULL; } 149 static inline void 150 nfs4_label_release_security(struct nfs4_label *label) 151 { return; } 152 static inline u32 * 153 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 154 { return server->attr_bitmask; } 155 #endif 156 157 /* Prevent leaks of NFSv4 errors into userland */ 158 static int nfs4_map_errors(int err) 159 { 160 if (err >= -1000) 161 return err; 162 switch (err) { 163 case -NFS4ERR_RESOURCE: 164 case -NFS4ERR_LAYOUTTRYLATER: 165 case -NFS4ERR_RECALLCONFLICT: 166 return -EREMOTEIO; 167 case -NFS4ERR_WRONGSEC: 168 case -NFS4ERR_WRONG_CRED: 169 return -EPERM; 170 case -NFS4ERR_BADOWNER: 171 case -NFS4ERR_BADNAME: 172 return -EINVAL; 173 case -NFS4ERR_SHARE_DENIED: 174 return -EACCES; 175 case -NFS4ERR_MINOR_VERS_MISMATCH: 176 return -EPROTONOSUPPORT; 177 case -NFS4ERR_FILE_OPEN: 178 return -EBUSY; 179 default: 180 dprintk("%s could not handle NFSv4 error %d\n", 181 __func__, -err); 182 break; 183 } 184 return -EIO; 185 } 186 187 /* 188 * This is our standard bitmap for GETATTR requests. 189 */ 190 const u32 nfs4_fattr_bitmap[3] = { 191 FATTR4_WORD0_TYPE 192 | FATTR4_WORD0_CHANGE 193 | FATTR4_WORD0_SIZE 194 | FATTR4_WORD0_FSID 195 | FATTR4_WORD0_FILEID, 196 FATTR4_WORD1_MODE 197 | FATTR4_WORD1_NUMLINKS 198 | FATTR4_WORD1_OWNER 199 | FATTR4_WORD1_OWNER_GROUP 200 | FATTR4_WORD1_RAWDEV 201 | FATTR4_WORD1_SPACE_USED 202 | FATTR4_WORD1_TIME_ACCESS 203 | FATTR4_WORD1_TIME_METADATA 204 | FATTR4_WORD1_TIME_MODIFY 205 | FATTR4_WORD1_MOUNTED_ON_FILEID, 206 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 207 FATTR4_WORD2_SECURITY_LABEL 208 #endif 209 }; 210 211 static const u32 nfs4_pnfs_open_bitmap[3] = { 212 FATTR4_WORD0_TYPE 213 | FATTR4_WORD0_CHANGE 214 | FATTR4_WORD0_SIZE 215 | FATTR4_WORD0_FSID 216 | FATTR4_WORD0_FILEID, 217 FATTR4_WORD1_MODE 218 | FATTR4_WORD1_NUMLINKS 219 | FATTR4_WORD1_OWNER 220 | FATTR4_WORD1_OWNER_GROUP 221 | FATTR4_WORD1_RAWDEV 222 | FATTR4_WORD1_SPACE_USED 223 | FATTR4_WORD1_TIME_ACCESS 224 | FATTR4_WORD1_TIME_METADATA 225 | FATTR4_WORD1_TIME_MODIFY, 226 FATTR4_WORD2_MDSTHRESHOLD 227 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 228 | FATTR4_WORD2_SECURITY_LABEL 229 #endif 230 }; 231 232 static const u32 nfs4_open_noattr_bitmap[3] = { 233 FATTR4_WORD0_TYPE 234 | FATTR4_WORD0_FILEID, 235 }; 236 237 const u32 nfs4_statfs_bitmap[3] = { 238 FATTR4_WORD0_FILES_AVAIL 239 | FATTR4_WORD0_FILES_FREE 240 | FATTR4_WORD0_FILES_TOTAL, 241 FATTR4_WORD1_SPACE_AVAIL 242 | FATTR4_WORD1_SPACE_FREE 243 | FATTR4_WORD1_SPACE_TOTAL 244 }; 245 246 const u32 nfs4_pathconf_bitmap[3] = { 247 FATTR4_WORD0_MAXLINK 248 | FATTR4_WORD0_MAXNAME, 249 0 250 }; 251 252 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 253 | FATTR4_WORD0_MAXREAD 254 | FATTR4_WORD0_MAXWRITE 255 | FATTR4_WORD0_LEASE_TIME, 256 FATTR4_WORD1_TIME_DELTA 257 | FATTR4_WORD1_FS_LAYOUT_TYPES, 258 FATTR4_WORD2_LAYOUT_BLKSIZE 259 | FATTR4_WORD2_CLONE_BLKSIZE 260 | FATTR4_WORD2_XATTR_SUPPORT 261 }; 262 263 const u32 nfs4_fs_locations_bitmap[3] = { 264 FATTR4_WORD0_CHANGE 265 | FATTR4_WORD0_SIZE 266 | FATTR4_WORD0_FSID 267 | FATTR4_WORD0_FILEID 268 | FATTR4_WORD0_FS_LOCATIONS, 269 FATTR4_WORD1_OWNER 270 | FATTR4_WORD1_OWNER_GROUP 271 | FATTR4_WORD1_RAWDEV 272 | FATTR4_WORD1_SPACE_USED 273 | FATTR4_WORD1_TIME_ACCESS 274 | FATTR4_WORD1_TIME_METADATA 275 | FATTR4_WORD1_TIME_MODIFY 276 | FATTR4_WORD1_MOUNTED_ON_FILEID, 277 }; 278 279 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 280 struct inode *inode) 281 { 282 unsigned long cache_validity; 283 284 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 285 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 286 return; 287 288 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 289 if (!(cache_validity & NFS_INO_REVAL_FORCED)) 290 cache_validity &= ~(NFS_INO_INVALID_CHANGE 291 | NFS_INO_INVALID_SIZE); 292 293 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 294 dst[0] &= ~FATTR4_WORD0_SIZE; 295 296 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 297 dst[0] &= ~FATTR4_WORD0_CHANGE; 298 } 299 300 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst, 301 const __u32 *src, struct inode *inode) 302 { 303 nfs4_bitmap_copy_adjust(dst, src, inode); 304 } 305 306 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 307 struct nfs4_readdir_arg *readdir) 308 { 309 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 310 __be32 *start, *p; 311 312 if (cookie > 2) { 313 readdir->cookie = cookie; 314 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 315 return; 316 } 317 318 readdir->cookie = 0; 319 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 320 if (cookie == 2) 321 return; 322 323 /* 324 * NFSv4 servers do not return entries for '.' and '..' 325 * Therefore, we fake these entries here. We let '.' 326 * have cookie 0 and '..' have cookie 1. Note that 327 * when talking to the server, we always send cookie 0 328 * instead of 1 or 2. 329 */ 330 start = p = kmap_atomic(*readdir->pages); 331 332 if (cookie == 0) { 333 *p++ = xdr_one; /* next */ 334 *p++ = xdr_zero; /* cookie, first word */ 335 *p++ = xdr_one; /* cookie, second word */ 336 *p++ = xdr_one; /* entry len */ 337 memcpy(p, ".\0\0\0", 4); /* entry */ 338 p++; 339 *p++ = xdr_one; /* bitmap length */ 340 *p++ = htonl(attrs); /* bitmap */ 341 *p++ = htonl(12); /* attribute buffer length */ 342 *p++ = htonl(NF4DIR); 343 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 344 } 345 346 *p++ = xdr_one; /* next */ 347 *p++ = xdr_zero; /* cookie, first word */ 348 *p++ = xdr_two; /* cookie, second word */ 349 *p++ = xdr_two; /* entry len */ 350 memcpy(p, "..\0\0", 4); /* entry */ 351 p++; 352 *p++ = xdr_one; /* bitmap length */ 353 *p++ = htonl(attrs); /* bitmap */ 354 *p++ = htonl(12); /* attribute buffer length */ 355 *p++ = htonl(NF4DIR); 356 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 357 358 readdir->pgbase = (char *)p - (char *)start; 359 readdir->count -= readdir->pgbase; 360 kunmap_atomic(start); 361 } 362 363 static void nfs4_test_and_free_stateid(struct nfs_server *server, 364 nfs4_stateid *stateid, 365 const struct cred *cred) 366 { 367 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 368 369 ops->test_and_free_expired(server, stateid, cred); 370 } 371 372 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 373 nfs4_stateid *stateid, 374 const struct cred *cred) 375 { 376 stateid->type = NFS4_REVOKED_STATEID_TYPE; 377 nfs4_test_and_free_stateid(server, stateid, cred); 378 } 379 380 static void nfs4_free_revoked_stateid(struct nfs_server *server, 381 const nfs4_stateid *stateid, 382 const struct cred *cred) 383 { 384 nfs4_stateid tmp; 385 386 nfs4_stateid_copy(&tmp, stateid); 387 __nfs4_free_revoked_stateid(server, &tmp, cred); 388 } 389 390 static long nfs4_update_delay(long *timeout) 391 { 392 long ret; 393 if (!timeout) 394 return NFS4_POLL_RETRY_MAX; 395 if (*timeout <= 0) 396 *timeout = NFS4_POLL_RETRY_MIN; 397 if (*timeout > NFS4_POLL_RETRY_MAX) 398 *timeout = NFS4_POLL_RETRY_MAX; 399 ret = *timeout; 400 *timeout <<= 1; 401 return ret; 402 } 403 404 static int nfs4_delay_killable(long *timeout) 405 { 406 might_sleep(); 407 408 freezable_schedule_timeout_killable_unsafe( 409 nfs4_update_delay(timeout)); 410 if (!__fatal_signal_pending(current)) 411 return 0; 412 return -EINTR; 413 } 414 415 static int nfs4_delay_interruptible(long *timeout) 416 { 417 might_sleep(); 418 419 freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout)); 420 if (!signal_pending(current)) 421 return 0; 422 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 423 } 424 425 static int nfs4_delay(long *timeout, bool interruptible) 426 { 427 if (interruptible) 428 return nfs4_delay_interruptible(timeout); 429 return nfs4_delay_killable(timeout); 430 } 431 432 static const nfs4_stateid * 433 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 434 { 435 if (!stateid) 436 return NULL; 437 switch (stateid->type) { 438 case NFS4_OPEN_STATEID_TYPE: 439 case NFS4_LOCK_STATEID_TYPE: 440 case NFS4_DELEGATION_STATEID_TYPE: 441 return stateid; 442 default: 443 break; 444 } 445 return NULL; 446 } 447 448 /* This is the error handling routine for processes that are allowed 449 * to sleep. 450 */ 451 static int nfs4_do_handle_exception(struct nfs_server *server, 452 int errorcode, struct nfs4_exception *exception) 453 { 454 struct nfs_client *clp = server->nfs_client; 455 struct nfs4_state *state = exception->state; 456 const nfs4_stateid *stateid; 457 struct inode *inode = exception->inode; 458 int ret = errorcode; 459 460 exception->delay = 0; 461 exception->recovering = 0; 462 exception->retry = 0; 463 464 stateid = nfs4_recoverable_stateid(exception->stateid); 465 if (stateid == NULL && state != NULL) 466 stateid = nfs4_recoverable_stateid(&state->stateid); 467 468 switch(errorcode) { 469 case 0: 470 return 0; 471 case -NFS4ERR_BADHANDLE: 472 case -ESTALE: 473 if (inode != NULL && S_ISREG(inode->i_mode)) 474 pnfs_destroy_layout(NFS_I(inode)); 475 break; 476 case -NFS4ERR_DELEG_REVOKED: 477 case -NFS4ERR_ADMIN_REVOKED: 478 case -NFS4ERR_EXPIRED: 479 case -NFS4ERR_BAD_STATEID: 480 case -NFS4ERR_PARTNER_NO_AUTH: 481 if (inode != NULL && stateid != NULL) { 482 nfs_inode_find_state_and_recover(inode, 483 stateid); 484 goto wait_on_recovery; 485 } 486 /* Fall through */ 487 case -NFS4ERR_OPENMODE: 488 if (inode) { 489 int err; 490 491 err = nfs_async_inode_return_delegation(inode, 492 stateid); 493 if (err == 0) 494 goto wait_on_recovery; 495 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 496 exception->retry = 1; 497 break; 498 } 499 } 500 if (state == NULL) 501 break; 502 ret = nfs4_schedule_stateid_recovery(server, state); 503 if (ret < 0) 504 break; 505 goto wait_on_recovery; 506 case -NFS4ERR_STALE_STATEID: 507 case -NFS4ERR_STALE_CLIENTID: 508 nfs4_schedule_lease_recovery(clp); 509 goto wait_on_recovery; 510 case -NFS4ERR_MOVED: 511 ret = nfs4_schedule_migration_recovery(server); 512 if (ret < 0) 513 break; 514 goto wait_on_recovery; 515 case -NFS4ERR_LEASE_MOVED: 516 nfs4_schedule_lease_moved_recovery(clp); 517 goto wait_on_recovery; 518 #if defined(CONFIG_NFS_V4_1) 519 case -NFS4ERR_BADSESSION: 520 case -NFS4ERR_BADSLOT: 521 case -NFS4ERR_BAD_HIGH_SLOT: 522 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 523 case -NFS4ERR_DEADSESSION: 524 case -NFS4ERR_SEQ_FALSE_RETRY: 525 case -NFS4ERR_SEQ_MISORDERED: 526 /* Handled in nfs41_sequence_process() */ 527 goto wait_on_recovery; 528 #endif /* defined(CONFIG_NFS_V4_1) */ 529 case -NFS4ERR_FILE_OPEN: 530 if (exception->timeout > HZ) { 531 /* We have retried a decent amount, time to 532 * fail 533 */ 534 ret = -EBUSY; 535 break; 536 } 537 /* Fall through */ 538 case -NFS4ERR_DELAY: 539 nfs_inc_server_stats(server, NFSIOS_DELAY); 540 /* Fall through */ 541 case -NFS4ERR_GRACE: 542 case -NFS4ERR_LAYOUTTRYLATER: 543 case -NFS4ERR_RECALLCONFLICT: 544 exception->delay = 1; 545 return 0; 546 547 case -NFS4ERR_RETRY_UNCACHED_REP: 548 case -NFS4ERR_OLD_STATEID: 549 exception->retry = 1; 550 break; 551 case -NFS4ERR_BADOWNER: 552 /* The following works around a Linux server bug! */ 553 case -NFS4ERR_BADNAME: 554 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 555 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 556 exception->retry = 1; 557 printk(KERN_WARNING "NFS: v4 server %s " 558 "does not accept raw " 559 "uid/gids. " 560 "Reenabling the idmapper.\n", 561 server->nfs_client->cl_hostname); 562 } 563 } 564 /* We failed to handle the error */ 565 return nfs4_map_errors(ret); 566 wait_on_recovery: 567 exception->recovering = 1; 568 return 0; 569 } 570 571 /* This is the error handling routine for processes that are allowed 572 * to sleep. 573 */ 574 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 575 { 576 struct nfs_client *clp = server->nfs_client; 577 int ret; 578 579 ret = nfs4_do_handle_exception(server, errorcode, exception); 580 if (exception->delay) { 581 ret = nfs4_delay(&exception->timeout, 582 exception->interruptible); 583 goto out_retry; 584 } 585 if (exception->recovering) { 586 ret = nfs4_wait_clnt_recover(clp); 587 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 588 return -EIO; 589 goto out_retry; 590 } 591 return ret; 592 out_retry: 593 if (ret == 0) 594 exception->retry = 1; 595 return ret; 596 } 597 598 static int 599 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 600 int errorcode, struct nfs4_exception *exception) 601 { 602 struct nfs_client *clp = server->nfs_client; 603 int ret; 604 605 ret = nfs4_do_handle_exception(server, errorcode, exception); 606 if (exception->delay) { 607 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 608 goto out_retry; 609 } 610 if (exception->recovering) { 611 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 612 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 613 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 614 goto out_retry; 615 } 616 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 617 ret = -EIO; 618 return ret; 619 out_retry: 620 if (ret == 0) { 621 exception->retry = 1; 622 /* 623 * For NFS4ERR_MOVED, the client transport will need to 624 * be recomputed after migration recovery has completed. 625 */ 626 if (errorcode == -NFS4ERR_MOVED) 627 rpc_task_release_transport(task); 628 } 629 return ret; 630 } 631 632 int 633 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 634 struct nfs4_state *state, long *timeout) 635 { 636 struct nfs4_exception exception = { 637 .state = state, 638 }; 639 640 if (task->tk_status >= 0) 641 return 0; 642 if (timeout) 643 exception.timeout = *timeout; 644 task->tk_status = nfs4_async_handle_exception(task, server, 645 task->tk_status, 646 &exception); 647 if (exception.delay && timeout) 648 *timeout = exception.timeout; 649 if (exception.retry) 650 return -EAGAIN; 651 return 0; 652 } 653 654 /* 655 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 656 * or 'false' otherwise. 657 */ 658 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 659 { 660 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 661 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 662 } 663 664 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 665 { 666 spin_lock(&clp->cl_lock); 667 if (time_before(clp->cl_last_renewal,timestamp)) 668 clp->cl_last_renewal = timestamp; 669 spin_unlock(&clp->cl_lock); 670 } 671 672 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 673 { 674 struct nfs_client *clp = server->nfs_client; 675 676 if (!nfs4_has_session(clp)) 677 do_renew_lease(clp, timestamp); 678 } 679 680 struct nfs4_call_sync_data { 681 const struct nfs_server *seq_server; 682 struct nfs4_sequence_args *seq_args; 683 struct nfs4_sequence_res *seq_res; 684 }; 685 686 void nfs4_init_sequence(struct nfs4_sequence_args *args, 687 struct nfs4_sequence_res *res, int cache_reply, 688 int privileged) 689 { 690 args->sa_slot = NULL; 691 args->sa_cache_this = cache_reply; 692 args->sa_privileged = privileged; 693 694 res->sr_slot = NULL; 695 } 696 697 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 698 { 699 struct nfs4_slot *slot = res->sr_slot; 700 struct nfs4_slot_table *tbl; 701 702 tbl = slot->table; 703 spin_lock(&tbl->slot_tbl_lock); 704 if (!nfs41_wake_and_assign_slot(tbl, slot)) 705 nfs4_free_slot(tbl, slot); 706 spin_unlock(&tbl->slot_tbl_lock); 707 708 res->sr_slot = NULL; 709 } 710 711 static int nfs40_sequence_done(struct rpc_task *task, 712 struct nfs4_sequence_res *res) 713 { 714 if (res->sr_slot != NULL) 715 nfs40_sequence_free_slot(res); 716 return 1; 717 } 718 719 #if defined(CONFIG_NFS_V4_1) 720 721 static void nfs41_release_slot(struct nfs4_slot *slot) 722 { 723 struct nfs4_session *session; 724 struct nfs4_slot_table *tbl; 725 bool send_new_highest_used_slotid = false; 726 727 if (!slot) 728 return; 729 tbl = slot->table; 730 session = tbl->session; 731 732 /* Bump the slot sequence number */ 733 if (slot->seq_done) 734 slot->seq_nr++; 735 slot->seq_done = 0; 736 737 spin_lock(&tbl->slot_tbl_lock); 738 /* Be nice to the server: try to ensure that the last transmitted 739 * value for highest_user_slotid <= target_highest_slotid 740 */ 741 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 742 send_new_highest_used_slotid = true; 743 744 if (nfs41_wake_and_assign_slot(tbl, slot)) { 745 send_new_highest_used_slotid = false; 746 goto out_unlock; 747 } 748 nfs4_free_slot(tbl, slot); 749 750 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 751 send_new_highest_used_slotid = false; 752 out_unlock: 753 spin_unlock(&tbl->slot_tbl_lock); 754 if (send_new_highest_used_slotid) 755 nfs41_notify_server(session->clp); 756 if (waitqueue_active(&tbl->slot_waitq)) 757 wake_up_all(&tbl->slot_waitq); 758 } 759 760 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 761 { 762 nfs41_release_slot(res->sr_slot); 763 res->sr_slot = NULL; 764 } 765 766 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 767 u32 seqnr) 768 { 769 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 770 slot->seq_nr_highest_sent = seqnr; 771 } 772 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, 773 u32 seqnr) 774 { 775 slot->seq_nr_highest_sent = seqnr; 776 slot->seq_nr_last_acked = seqnr; 777 } 778 779 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 780 struct nfs4_slot *slot) 781 { 782 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 783 if (!IS_ERR(task)) 784 rpc_put_task_async(task); 785 } 786 787 static int nfs41_sequence_process(struct rpc_task *task, 788 struct nfs4_sequence_res *res) 789 { 790 struct nfs4_session *session; 791 struct nfs4_slot *slot = res->sr_slot; 792 struct nfs_client *clp; 793 int status; 794 int ret = 1; 795 796 if (slot == NULL) 797 goto out_noaction; 798 /* don't increment the sequence number if the task wasn't sent */ 799 if (!RPC_WAS_SENT(task) || slot->seq_done) 800 goto out; 801 802 session = slot->table->session; 803 clp = session->clp; 804 805 trace_nfs4_sequence_done(session, res); 806 807 status = res->sr_status; 808 if (task->tk_status == -NFS4ERR_DEADSESSION) 809 status = -NFS4ERR_DEADSESSION; 810 811 /* Check the SEQUENCE operation status */ 812 switch (status) { 813 case 0: 814 /* Mark this sequence number as having been acked */ 815 nfs4_slot_sequence_acked(slot, slot->seq_nr); 816 /* Update the slot's sequence and clientid lease timer */ 817 slot->seq_done = 1; 818 do_renew_lease(clp, res->sr_timestamp); 819 /* Check sequence flags */ 820 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 821 !!slot->privileged); 822 nfs41_update_target_slotid(slot->table, slot, res); 823 break; 824 case 1: 825 /* 826 * sr_status remains 1 if an RPC level error occurred. 827 * The server may or may not have processed the sequence 828 * operation.. 829 */ 830 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 831 slot->seq_done = 1; 832 goto out; 833 case -NFS4ERR_DELAY: 834 /* The server detected a resend of the RPC call and 835 * returned NFS4ERR_DELAY as per Section 2.10.6.2 836 * of RFC5661. 837 */ 838 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 839 __func__, 840 slot->slot_nr, 841 slot->seq_nr); 842 nfs4_slot_sequence_acked(slot, slot->seq_nr); 843 goto out_retry; 844 case -NFS4ERR_RETRY_UNCACHED_REP: 845 case -NFS4ERR_SEQ_FALSE_RETRY: 846 /* 847 * The server thinks we tried to replay a request. 848 * Retry the call after bumping the sequence ID. 849 */ 850 nfs4_slot_sequence_acked(slot, slot->seq_nr); 851 goto retry_new_seq; 852 case -NFS4ERR_BADSLOT: 853 /* 854 * The slot id we used was probably retired. Try again 855 * using a different slot id. 856 */ 857 if (slot->slot_nr < slot->table->target_highest_slotid) 858 goto session_recover; 859 goto retry_nowait; 860 case -NFS4ERR_SEQ_MISORDERED: 861 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 862 /* 863 * Were one or more calls using this slot interrupted? 864 * If the server never received the request, then our 865 * transmitted slot sequence number may be too high. However, 866 * if the server did receive the request then it might 867 * accidentally give us a reply with a mismatched operation. 868 * We can sort this out by sending a lone sequence operation 869 * to the server on the same slot. 870 */ 871 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 872 slot->seq_nr--; 873 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 874 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 875 res->sr_slot = NULL; 876 } 877 goto retry_nowait; 878 } 879 /* 880 * RFC5661: 881 * A retry might be sent while the original request is 882 * still in progress on the replier. The replier SHOULD 883 * deal with the issue by returning NFS4ERR_DELAY as the 884 * reply to SEQUENCE or CB_SEQUENCE operation, but 885 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 886 * 887 * Restart the search after a delay. 888 */ 889 slot->seq_nr = slot->seq_nr_highest_sent; 890 goto out_retry; 891 case -NFS4ERR_BADSESSION: 892 case -NFS4ERR_DEADSESSION: 893 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 894 goto session_recover; 895 default: 896 /* Just update the slot sequence no. */ 897 slot->seq_done = 1; 898 } 899 out: 900 /* The session may be reset by one of the error handlers. */ 901 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 902 out_noaction: 903 return ret; 904 session_recover: 905 nfs4_schedule_session_recovery(session, status); 906 dprintk("%s ERROR: %d Reset session\n", __func__, status); 907 nfs41_sequence_free_slot(res); 908 goto out; 909 retry_new_seq: 910 ++slot->seq_nr; 911 retry_nowait: 912 if (rpc_restart_call_prepare(task)) { 913 nfs41_sequence_free_slot(res); 914 task->tk_status = 0; 915 ret = 0; 916 } 917 goto out; 918 out_retry: 919 if (!rpc_restart_call(task)) 920 goto out; 921 rpc_delay(task, NFS4_POLL_RETRY_MAX); 922 return 0; 923 } 924 925 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 926 { 927 if (!nfs41_sequence_process(task, res)) 928 return 0; 929 if (res->sr_slot != NULL) 930 nfs41_sequence_free_slot(res); 931 return 1; 932 933 } 934 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 935 936 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 937 { 938 if (res->sr_slot == NULL) 939 return 1; 940 if (res->sr_slot->table->session != NULL) 941 return nfs41_sequence_process(task, res); 942 return nfs40_sequence_done(task, res); 943 } 944 945 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 946 { 947 if (res->sr_slot != NULL) { 948 if (res->sr_slot->table->session != NULL) 949 nfs41_sequence_free_slot(res); 950 else 951 nfs40_sequence_free_slot(res); 952 } 953 } 954 955 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 956 { 957 if (res->sr_slot == NULL) 958 return 1; 959 if (!res->sr_slot->table->session) 960 return nfs40_sequence_done(task, res); 961 return nfs41_sequence_done(task, res); 962 } 963 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 964 965 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 966 { 967 struct nfs4_call_sync_data *data = calldata; 968 969 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 970 971 nfs4_setup_sequence(data->seq_server->nfs_client, 972 data->seq_args, data->seq_res, task); 973 } 974 975 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 976 { 977 struct nfs4_call_sync_data *data = calldata; 978 979 nfs41_sequence_done(task, data->seq_res); 980 } 981 982 static const struct rpc_call_ops nfs41_call_sync_ops = { 983 .rpc_call_prepare = nfs41_call_sync_prepare, 984 .rpc_call_done = nfs41_call_sync_done, 985 }; 986 987 #else /* !CONFIG_NFS_V4_1 */ 988 989 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 990 { 991 return nfs40_sequence_done(task, res); 992 } 993 994 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 995 { 996 if (res->sr_slot != NULL) 997 nfs40_sequence_free_slot(res); 998 } 999 1000 int nfs4_sequence_done(struct rpc_task *task, 1001 struct nfs4_sequence_res *res) 1002 { 1003 return nfs40_sequence_done(task, res); 1004 } 1005 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1006 1007 #endif /* !CONFIG_NFS_V4_1 */ 1008 1009 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1010 { 1011 res->sr_timestamp = jiffies; 1012 res->sr_status_flags = 0; 1013 res->sr_status = 1; 1014 } 1015 1016 static 1017 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1018 struct nfs4_sequence_res *res, 1019 struct nfs4_slot *slot) 1020 { 1021 if (!slot) 1022 return; 1023 slot->privileged = args->sa_privileged ? 1 : 0; 1024 args->sa_slot = slot; 1025 1026 res->sr_slot = slot; 1027 } 1028 1029 int nfs4_setup_sequence(struct nfs_client *client, 1030 struct nfs4_sequence_args *args, 1031 struct nfs4_sequence_res *res, 1032 struct rpc_task *task) 1033 { 1034 struct nfs4_session *session = nfs4_get_session(client); 1035 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1036 struct nfs4_slot *slot; 1037 1038 /* slot already allocated? */ 1039 if (res->sr_slot != NULL) 1040 goto out_start; 1041 1042 if (session) 1043 tbl = &session->fc_slot_table; 1044 1045 spin_lock(&tbl->slot_tbl_lock); 1046 /* The state manager will wait until the slot table is empty */ 1047 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1048 goto out_sleep; 1049 1050 slot = nfs4_alloc_slot(tbl); 1051 if (IS_ERR(slot)) { 1052 if (slot == ERR_PTR(-ENOMEM)) 1053 goto out_sleep_timeout; 1054 goto out_sleep; 1055 } 1056 spin_unlock(&tbl->slot_tbl_lock); 1057 1058 nfs4_sequence_attach_slot(args, res, slot); 1059 1060 trace_nfs4_setup_sequence(session, args); 1061 out_start: 1062 nfs41_sequence_res_init(res); 1063 rpc_call_start(task); 1064 return 0; 1065 out_sleep_timeout: 1066 /* Try again in 1/4 second */ 1067 if (args->sa_privileged) 1068 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1069 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1070 else 1071 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1072 NULL, jiffies + (HZ >> 2)); 1073 spin_unlock(&tbl->slot_tbl_lock); 1074 return -EAGAIN; 1075 out_sleep: 1076 if (args->sa_privileged) 1077 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1078 RPC_PRIORITY_PRIVILEGED); 1079 else 1080 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1081 spin_unlock(&tbl->slot_tbl_lock); 1082 return -EAGAIN; 1083 } 1084 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1085 1086 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1087 { 1088 struct nfs4_call_sync_data *data = calldata; 1089 nfs4_setup_sequence(data->seq_server->nfs_client, 1090 data->seq_args, data->seq_res, task); 1091 } 1092 1093 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1094 { 1095 struct nfs4_call_sync_data *data = calldata; 1096 nfs4_sequence_done(task, data->seq_res); 1097 } 1098 1099 static const struct rpc_call_ops nfs40_call_sync_ops = { 1100 .rpc_call_prepare = nfs40_call_sync_prepare, 1101 .rpc_call_done = nfs40_call_sync_done, 1102 }; 1103 1104 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1105 { 1106 int ret; 1107 struct rpc_task *task; 1108 1109 task = rpc_run_task(task_setup); 1110 if (IS_ERR(task)) 1111 return PTR_ERR(task); 1112 1113 ret = task->tk_status; 1114 rpc_put_task(task); 1115 return ret; 1116 } 1117 1118 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1119 struct nfs_server *server, 1120 struct rpc_message *msg, 1121 struct nfs4_sequence_args *args, 1122 struct nfs4_sequence_res *res, 1123 unsigned short task_flags) 1124 { 1125 struct nfs_client *clp = server->nfs_client; 1126 struct nfs4_call_sync_data data = { 1127 .seq_server = server, 1128 .seq_args = args, 1129 .seq_res = res, 1130 }; 1131 struct rpc_task_setup task_setup = { 1132 .rpc_client = clnt, 1133 .rpc_message = msg, 1134 .callback_ops = clp->cl_mvops->call_sync_ops, 1135 .callback_data = &data, 1136 .flags = task_flags, 1137 }; 1138 1139 return nfs4_call_sync_custom(&task_setup); 1140 } 1141 1142 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1143 struct nfs_server *server, 1144 struct rpc_message *msg, 1145 struct nfs4_sequence_args *args, 1146 struct nfs4_sequence_res *res) 1147 { 1148 return nfs4_do_call_sync(clnt, server, msg, args, res, 0); 1149 } 1150 1151 1152 int nfs4_call_sync(struct rpc_clnt *clnt, 1153 struct nfs_server *server, 1154 struct rpc_message *msg, 1155 struct nfs4_sequence_args *args, 1156 struct nfs4_sequence_res *res, 1157 int cache_reply) 1158 { 1159 nfs4_init_sequence(args, res, cache_reply, 0); 1160 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1161 } 1162 1163 static void 1164 nfs4_inc_nlink_locked(struct inode *inode) 1165 { 1166 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER; 1167 inc_nlink(inode); 1168 } 1169 1170 static void 1171 nfs4_dec_nlink_locked(struct inode *inode) 1172 { 1173 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER; 1174 drop_nlink(inode); 1175 } 1176 1177 static void 1178 nfs4_update_changeattr_locked(struct inode *inode, 1179 struct nfs4_change_info *cinfo, 1180 unsigned long timestamp, unsigned long cache_validity) 1181 { 1182 struct nfs_inode *nfsi = NFS_I(inode); 1183 1184 nfsi->cache_validity |= NFS_INO_INVALID_CTIME 1185 | NFS_INO_INVALID_MTIME 1186 | cache_validity; 1187 1188 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(inode)) { 1189 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; 1190 nfsi->attrtimeo_timestamp = jiffies; 1191 } else { 1192 if (S_ISDIR(inode->i_mode)) { 1193 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1194 nfs_force_lookup_revalidate(inode); 1195 } else { 1196 if (!NFS_PROTO(inode)->have_delegation(inode, 1197 FMODE_READ)) 1198 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; 1199 } 1200 1201 if (cinfo->before != inode_peek_iversion_raw(inode)) 1202 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | 1203 NFS_INO_INVALID_ACL | 1204 NFS_INO_INVALID_XATTR; 1205 } 1206 inode_set_iversion_raw(inode, cinfo->after); 1207 nfsi->read_cache_jiffies = timestamp; 1208 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1209 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1210 1211 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1212 nfs_fscache_invalidate(inode); 1213 } 1214 1215 void 1216 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1217 unsigned long timestamp, unsigned long cache_validity) 1218 { 1219 spin_lock(&dir->i_lock); 1220 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1221 spin_unlock(&dir->i_lock); 1222 } 1223 1224 struct nfs4_open_createattrs { 1225 struct nfs4_label *label; 1226 struct iattr *sattr; 1227 const __u32 verf[2]; 1228 }; 1229 1230 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1231 int err, struct nfs4_exception *exception) 1232 { 1233 if (err != -EINVAL) 1234 return false; 1235 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1236 return false; 1237 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1238 exception->retry = 1; 1239 return true; 1240 } 1241 1242 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1243 { 1244 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1245 } 1246 1247 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1248 { 1249 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1250 1251 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1252 } 1253 1254 static u32 1255 nfs4_map_atomic_open_share(struct nfs_server *server, 1256 fmode_t fmode, int openflags) 1257 { 1258 u32 res = 0; 1259 1260 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1261 case FMODE_READ: 1262 res = NFS4_SHARE_ACCESS_READ; 1263 break; 1264 case FMODE_WRITE: 1265 res = NFS4_SHARE_ACCESS_WRITE; 1266 break; 1267 case FMODE_READ|FMODE_WRITE: 1268 res = NFS4_SHARE_ACCESS_BOTH; 1269 } 1270 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1271 goto out; 1272 /* Want no delegation if we're using O_DIRECT */ 1273 if (openflags & O_DIRECT) 1274 res |= NFS4_SHARE_WANT_NO_DELEG; 1275 out: 1276 return res; 1277 } 1278 1279 static enum open_claim_type4 1280 nfs4_map_atomic_open_claim(struct nfs_server *server, 1281 enum open_claim_type4 claim) 1282 { 1283 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1284 return claim; 1285 switch (claim) { 1286 default: 1287 return claim; 1288 case NFS4_OPEN_CLAIM_FH: 1289 return NFS4_OPEN_CLAIM_NULL; 1290 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1291 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1292 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1293 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1294 } 1295 } 1296 1297 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1298 { 1299 p->o_res.f_attr = &p->f_attr; 1300 p->o_res.f_label = p->f_label; 1301 p->o_res.seqid = p->o_arg.seqid; 1302 p->c_res.seqid = p->c_arg.seqid; 1303 p->o_res.server = p->o_arg.server; 1304 p->o_res.access_request = p->o_arg.access; 1305 nfs_fattr_init(&p->f_attr); 1306 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1307 } 1308 1309 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1310 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1311 const struct nfs4_open_createattrs *c, 1312 enum open_claim_type4 claim, 1313 gfp_t gfp_mask) 1314 { 1315 struct dentry *parent = dget_parent(dentry); 1316 struct inode *dir = d_inode(parent); 1317 struct nfs_server *server = NFS_SERVER(dir); 1318 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1319 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1320 struct nfs4_opendata *p; 1321 1322 p = kzalloc(sizeof(*p), gfp_mask); 1323 if (p == NULL) 1324 goto err; 1325 1326 p->f_label = nfs4_label_alloc(server, gfp_mask); 1327 if (IS_ERR(p->f_label)) 1328 goto err_free_p; 1329 1330 p->a_label = nfs4_label_alloc(server, gfp_mask); 1331 if (IS_ERR(p->a_label)) 1332 goto err_free_f; 1333 1334 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1335 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1336 if (IS_ERR(p->o_arg.seqid)) 1337 goto err_free_label; 1338 nfs_sb_active(dentry->d_sb); 1339 p->dentry = dget(dentry); 1340 p->dir = parent; 1341 p->owner = sp; 1342 atomic_inc(&sp->so_count); 1343 p->o_arg.open_flags = flags; 1344 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1345 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1346 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1347 fmode, flags); 1348 if (flags & O_CREAT) { 1349 p->o_arg.umask = current_umask(); 1350 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1351 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1352 p->o_arg.u.attrs = &p->attrs; 1353 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1354 1355 memcpy(p->o_arg.u.verifier.data, c->verf, 1356 sizeof(p->o_arg.u.verifier.data)); 1357 } 1358 } 1359 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1360 * will return permission denied for all bits until close */ 1361 if (!(flags & O_EXCL)) { 1362 /* ask server to check for all possible rights as results 1363 * are cached */ 1364 switch (p->o_arg.claim) { 1365 default: 1366 break; 1367 case NFS4_OPEN_CLAIM_NULL: 1368 case NFS4_OPEN_CLAIM_FH: 1369 p->o_arg.access = NFS4_ACCESS_READ | 1370 NFS4_ACCESS_MODIFY | 1371 NFS4_ACCESS_EXTEND | 1372 NFS4_ACCESS_EXECUTE; 1373 #ifdef CONFIG_NFS_V4_2 1374 if (server->caps & NFS_CAP_XATTR) 1375 p->o_arg.access |= NFS4_ACCESS_XAREAD | 1376 NFS4_ACCESS_XAWRITE | 1377 NFS4_ACCESS_XALIST; 1378 #endif 1379 } 1380 } 1381 p->o_arg.clientid = server->nfs_client->cl_clientid; 1382 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1383 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1384 p->o_arg.name = &dentry->d_name; 1385 p->o_arg.server = server; 1386 p->o_arg.bitmask = nfs4_bitmask(server, label); 1387 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1388 switch (p->o_arg.claim) { 1389 case NFS4_OPEN_CLAIM_NULL: 1390 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1391 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1392 p->o_arg.fh = NFS_FH(dir); 1393 break; 1394 case NFS4_OPEN_CLAIM_PREVIOUS: 1395 case NFS4_OPEN_CLAIM_FH: 1396 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1397 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1398 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1399 } 1400 p->c_arg.fh = &p->o_res.fh; 1401 p->c_arg.stateid = &p->o_res.stateid; 1402 p->c_arg.seqid = p->o_arg.seqid; 1403 nfs4_init_opendata_res(p); 1404 kref_init(&p->kref); 1405 return p; 1406 1407 err_free_label: 1408 nfs4_label_free(p->a_label); 1409 err_free_f: 1410 nfs4_label_free(p->f_label); 1411 err_free_p: 1412 kfree(p); 1413 err: 1414 dput(parent); 1415 return NULL; 1416 } 1417 1418 static void nfs4_opendata_free(struct kref *kref) 1419 { 1420 struct nfs4_opendata *p = container_of(kref, 1421 struct nfs4_opendata, kref); 1422 struct super_block *sb = p->dentry->d_sb; 1423 1424 nfs4_lgopen_release(p->lgp); 1425 nfs_free_seqid(p->o_arg.seqid); 1426 nfs4_sequence_free_slot(&p->o_res.seq_res); 1427 if (p->state != NULL) 1428 nfs4_put_open_state(p->state); 1429 nfs4_put_state_owner(p->owner); 1430 1431 nfs4_label_free(p->a_label); 1432 nfs4_label_free(p->f_label); 1433 1434 dput(p->dir); 1435 dput(p->dentry); 1436 nfs_sb_deactive(sb); 1437 nfs_fattr_free_names(&p->f_attr); 1438 kfree(p->f_attr.mdsthreshold); 1439 kfree(p); 1440 } 1441 1442 static void nfs4_opendata_put(struct nfs4_opendata *p) 1443 { 1444 if (p != NULL) 1445 kref_put(&p->kref, nfs4_opendata_free); 1446 } 1447 1448 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1449 fmode_t fmode) 1450 { 1451 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1452 case FMODE_READ|FMODE_WRITE: 1453 return state->n_rdwr != 0; 1454 case FMODE_WRITE: 1455 return state->n_wronly != 0; 1456 case FMODE_READ: 1457 return state->n_rdonly != 0; 1458 } 1459 WARN_ON_ONCE(1); 1460 return false; 1461 } 1462 1463 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1464 int open_mode, enum open_claim_type4 claim) 1465 { 1466 int ret = 0; 1467 1468 if (open_mode & (O_EXCL|O_TRUNC)) 1469 goto out; 1470 switch (claim) { 1471 case NFS4_OPEN_CLAIM_NULL: 1472 case NFS4_OPEN_CLAIM_FH: 1473 goto out; 1474 default: 1475 break; 1476 } 1477 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1478 case FMODE_READ: 1479 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1480 && state->n_rdonly != 0; 1481 break; 1482 case FMODE_WRITE: 1483 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1484 && state->n_wronly != 0; 1485 break; 1486 case FMODE_READ|FMODE_WRITE: 1487 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1488 && state->n_rdwr != 0; 1489 } 1490 out: 1491 return ret; 1492 } 1493 1494 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1495 enum open_claim_type4 claim) 1496 { 1497 if (delegation == NULL) 1498 return 0; 1499 if ((delegation->type & fmode) != fmode) 1500 return 0; 1501 switch (claim) { 1502 case NFS4_OPEN_CLAIM_NULL: 1503 case NFS4_OPEN_CLAIM_FH: 1504 break; 1505 case NFS4_OPEN_CLAIM_PREVIOUS: 1506 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1507 break; 1508 /* Fall through */ 1509 default: 1510 return 0; 1511 } 1512 nfs_mark_delegation_referenced(delegation); 1513 return 1; 1514 } 1515 1516 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1517 { 1518 switch (fmode) { 1519 case FMODE_WRITE: 1520 state->n_wronly++; 1521 break; 1522 case FMODE_READ: 1523 state->n_rdonly++; 1524 break; 1525 case FMODE_READ|FMODE_WRITE: 1526 state->n_rdwr++; 1527 } 1528 nfs4_state_set_mode_locked(state, state->state | fmode); 1529 } 1530 1531 #ifdef CONFIG_NFS_V4_1 1532 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1533 { 1534 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1535 return true; 1536 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1537 return true; 1538 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1539 return true; 1540 return false; 1541 } 1542 #endif /* CONFIG_NFS_V4_1 */ 1543 1544 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1545 { 1546 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1547 wake_up_all(&state->waitq); 1548 } 1549 1550 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state, 1551 const nfs4_stateid *stateid) 1552 { 1553 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid); 1554 u32 stateid_seqid = be32_to_cpu(stateid->seqid); 1555 1556 if (stateid_seqid == state_seqid + 1U || 1557 (stateid_seqid == 1U && state_seqid == 0xffffffffU)) 1558 nfs_state_log_update_open_stateid(state); 1559 else 1560 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1561 } 1562 1563 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1564 { 1565 struct nfs_client *clp = state->owner->so_server->nfs_client; 1566 bool need_recover = false; 1567 1568 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1569 need_recover = true; 1570 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1571 need_recover = true; 1572 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1573 need_recover = true; 1574 if (need_recover) 1575 nfs4_state_mark_reclaim_nograce(clp, state); 1576 } 1577 1578 /* 1579 * Check for whether or not the caller may update the open stateid 1580 * to the value passed in by stateid. 1581 * 1582 * Note: This function relies heavily on the server implementing 1583 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1584 * correctly. 1585 * i.e. The stateid seqids have to be initialised to 1, and 1586 * are then incremented on every state transition. 1587 */ 1588 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1589 const nfs4_stateid *stateid) 1590 { 1591 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 || 1592 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1593 if (stateid->seqid == cpu_to_be32(1)) 1594 nfs_state_log_update_open_stateid(state); 1595 else 1596 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1597 return true; 1598 } 1599 1600 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1601 nfs_state_log_out_of_order_open_stateid(state, stateid); 1602 return true; 1603 } 1604 return false; 1605 } 1606 1607 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1608 { 1609 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1610 return; 1611 if (state->n_wronly) 1612 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1613 if (state->n_rdonly) 1614 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1615 if (state->n_rdwr) 1616 set_bit(NFS_O_RDWR_STATE, &state->flags); 1617 set_bit(NFS_OPEN_STATE, &state->flags); 1618 } 1619 1620 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1621 nfs4_stateid *stateid, fmode_t fmode) 1622 { 1623 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1624 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1625 case FMODE_WRITE: 1626 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1627 break; 1628 case FMODE_READ: 1629 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1630 break; 1631 case 0: 1632 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1633 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1634 clear_bit(NFS_OPEN_STATE, &state->flags); 1635 } 1636 if (stateid == NULL) 1637 return; 1638 /* Handle OPEN+OPEN_DOWNGRADE races */ 1639 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1640 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1641 nfs_resync_open_stateid_locked(state); 1642 goto out; 1643 } 1644 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1645 nfs4_stateid_copy(&state->stateid, stateid); 1646 nfs4_stateid_copy(&state->open_stateid, stateid); 1647 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1648 out: 1649 nfs_state_log_update_open_stateid(state); 1650 } 1651 1652 static void nfs_clear_open_stateid(struct nfs4_state *state, 1653 nfs4_stateid *arg_stateid, 1654 nfs4_stateid *stateid, fmode_t fmode) 1655 { 1656 write_seqlock(&state->seqlock); 1657 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1658 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1659 nfs_clear_open_stateid_locked(state, stateid, fmode); 1660 write_sequnlock(&state->seqlock); 1661 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1662 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1663 } 1664 1665 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1666 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1667 __must_hold(&state->owner->so_lock) 1668 __must_hold(&state->seqlock) 1669 __must_hold(RCU) 1670 1671 { 1672 DEFINE_WAIT(wait); 1673 int status = 0; 1674 for (;;) { 1675 1676 if (!nfs_need_update_open_stateid(state, stateid)) 1677 return; 1678 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1679 break; 1680 if (status) 1681 break; 1682 /* Rely on seqids for serialisation with NFSv4.0 */ 1683 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1684 break; 1685 1686 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1687 /* 1688 * Ensure we process the state changes in the same order 1689 * in which the server processed them by delaying the 1690 * update of the stateid until we are in sequence. 1691 */ 1692 write_sequnlock(&state->seqlock); 1693 spin_unlock(&state->owner->so_lock); 1694 rcu_read_unlock(); 1695 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1696 if (!signal_pending(current)) { 1697 if (schedule_timeout(5*HZ) == 0) 1698 status = -EAGAIN; 1699 else 1700 status = 0; 1701 } else 1702 status = -EINTR; 1703 finish_wait(&state->waitq, &wait); 1704 rcu_read_lock(); 1705 spin_lock(&state->owner->so_lock); 1706 write_seqlock(&state->seqlock); 1707 } 1708 1709 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1710 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1711 nfs4_stateid_copy(freeme, &state->open_stateid); 1712 nfs_test_and_clear_all_open_stateid(state); 1713 } 1714 1715 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1716 nfs4_stateid_copy(&state->stateid, stateid); 1717 nfs4_stateid_copy(&state->open_stateid, stateid); 1718 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1719 nfs_state_log_update_open_stateid(state); 1720 } 1721 1722 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1723 const nfs4_stateid *open_stateid, 1724 fmode_t fmode, 1725 nfs4_stateid *freeme) 1726 { 1727 /* 1728 * Protect the call to nfs4_state_set_mode_locked and 1729 * serialise the stateid update 1730 */ 1731 write_seqlock(&state->seqlock); 1732 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1733 switch (fmode) { 1734 case FMODE_READ: 1735 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1736 break; 1737 case FMODE_WRITE: 1738 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1739 break; 1740 case FMODE_READ|FMODE_WRITE: 1741 set_bit(NFS_O_RDWR_STATE, &state->flags); 1742 } 1743 set_bit(NFS_OPEN_STATE, &state->flags); 1744 write_sequnlock(&state->seqlock); 1745 } 1746 1747 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1748 { 1749 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1750 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1751 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1752 clear_bit(NFS_OPEN_STATE, &state->flags); 1753 } 1754 1755 static void nfs_state_set_delegation(struct nfs4_state *state, 1756 const nfs4_stateid *deleg_stateid, 1757 fmode_t fmode) 1758 { 1759 /* 1760 * Protect the call to nfs4_state_set_mode_locked and 1761 * serialise the stateid update 1762 */ 1763 write_seqlock(&state->seqlock); 1764 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1765 set_bit(NFS_DELEGATED_STATE, &state->flags); 1766 write_sequnlock(&state->seqlock); 1767 } 1768 1769 static void nfs_state_clear_delegation(struct nfs4_state *state) 1770 { 1771 write_seqlock(&state->seqlock); 1772 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1773 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1774 write_sequnlock(&state->seqlock); 1775 } 1776 1777 int update_open_stateid(struct nfs4_state *state, 1778 const nfs4_stateid *open_stateid, 1779 const nfs4_stateid *delegation, 1780 fmode_t fmode) 1781 { 1782 struct nfs_server *server = NFS_SERVER(state->inode); 1783 struct nfs_client *clp = server->nfs_client; 1784 struct nfs_inode *nfsi = NFS_I(state->inode); 1785 struct nfs_delegation *deleg_cur; 1786 nfs4_stateid freeme = { }; 1787 int ret = 0; 1788 1789 fmode &= (FMODE_READ|FMODE_WRITE); 1790 1791 rcu_read_lock(); 1792 spin_lock(&state->owner->so_lock); 1793 if (open_stateid != NULL) { 1794 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1795 ret = 1; 1796 } 1797 1798 deleg_cur = nfs4_get_valid_delegation(state->inode); 1799 if (deleg_cur == NULL) 1800 goto no_delegation; 1801 1802 spin_lock(&deleg_cur->lock); 1803 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1804 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1805 (deleg_cur->type & fmode) != fmode) 1806 goto no_delegation_unlock; 1807 1808 if (delegation == NULL) 1809 delegation = &deleg_cur->stateid; 1810 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1811 goto no_delegation_unlock; 1812 1813 nfs_mark_delegation_referenced(deleg_cur); 1814 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1815 ret = 1; 1816 no_delegation_unlock: 1817 spin_unlock(&deleg_cur->lock); 1818 no_delegation: 1819 if (ret) 1820 update_open_stateflags(state, fmode); 1821 spin_unlock(&state->owner->so_lock); 1822 rcu_read_unlock(); 1823 1824 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1825 nfs4_schedule_state_manager(clp); 1826 if (freeme.type != 0) 1827 nfs4_test_and_free_stateid(server, &freeme, 1828 state->owner->so_cred); 1829 1830 return ret; 1831 } 1832 1833 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1834 const nfs4_stateid *stateid) 1835 { 1836 struct nfs4_state *state = lsp->ls_state; 1837 bool ret = false; 1838 1839 spin_lock(&state->state_lock); 1840 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1841 goto out_noupdate; 1842 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1843 goto out_noupdate; 1844 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1845 ret = true; 1846 out_noupdate: 1847 spin_unlock(&state->state_lock); 1848 return ret; 1849 } 1850 1851 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1852 { 1853 struct nfs_delegation *delegation; 1854 1855 fmode &= FMODE_READ|FMODE_WRITE; 1856 rcu_read_lock(); 1857 delegation = nfs4_get_valid_delegation(inode); 1858 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1859 rcu_read_unlock(); 1860 return; 1861 } 1862 rcu_read_unlock(); 1863 nfs4_inode_return_delegation(inode); 1864 } 1865 1866 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1867 { 1868 struct nfs4_state *state = opendata->state; 1869 struct nfs_delegation *delegation; 1870 int open_mode = opendata->o_arg.open_flags; 1871 fmode_t fmode = opendata->o_arg.fmode; 1872 enum open_claim_type4 claim = opendata->o_arg.claim; 1873 nfs4_stateid stateid; 1874 int ret = -EAGAIN; 1875 1876 for (;;) { 1877 spin_lock(&state->owner->so_lock); 1878 if (can_open_cached(state, fmode, open_mode, claim)) { 1879 update_open_stateflags(state, fmode); 1880 spin_unlock(&state->owner->so_lock); 1881 goto out_return_state; 1882 } 1883 spin_unlock(&state->owner->so_lock); 1884 rcu_read_lock(); 1885 delegation = nfs4_get_valid_delegation(state->inode); 1886 if (!can_open_delegated(delegation, fmode, claim)) { 1887 rcu_read_unlock(); 1888 break; 1889 } 1890 /* Save the delegation */ 1891 nfs4_stateid_copy(&stateid, &delegation->stateid); 1892 rcu_read_unlock(); 1893 nfs_release_seqid(opendata->o_arg.seqid); 1894 if (!opendata->is_recover) { 1895 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1896 if (ret != 0) 1897 goto out; 1898 } 1899 ret = -EAGAIN; 1900 1901 /* Try to update the stateid using the delegation */ 1902 if (update_open_stateid(state, NULL, &stateid, fmode)) 1903 goto out_return_state; 1904 } 1905 out: 1906 return ERR_PTR(ret); 1907 out_return_state: 1908 refcount_inc(&state->count); 1909 return state; 1910 } 1911 1912 static void 1913 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1914 { 1915 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1916 struct nfs_delegation *delegation; 1917 int delegation_flags = 0; 1918 1919 rcu_read_lock(); 1920 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1921 if (delegation) 1922 delegation_flags = delegation->flags; 1923 rcu_read_unlock(); 1924 switch (data->o_arg.claim) { 1925 default: 1926 break; 1927 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1928 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1929 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1930 "returning a delegation for " 1931 "OPEN(CLAIM_DELEGATE_CUR)\n", 1932 clp->cl_hostname); 1933 return; 1934 } 1935 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1936 nfs_inode_set_delegation(state->inode, 1937 data->owner->so_cred, 1938 data->o_res.delegation_type, 1939 &data->o_res.delegation, 1940 data->o_res.pagemod_limit); 1941 else 1942 nfs_inode_reclaim_delegation(state->inode, 1943 data->owner->so_cred, 1944 data->o_res.delegation_type, 1945 &data->o_res.delegation, 1946 data->o_res.pagemod_limit); 1947 1948 if (data->o_res.do_recall) 1949 nfs_async_inode_return_delegation(state->inode, 1950 &data->o_res.delegation); 1951 } 1952 1953 /* 1954 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1955 * and update the nfs4_state. 1956 */ 1957 static struct nfs4_state * 1958 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1959 { 1960 struct inode *inode = data->state->inode; 1961 struct nfs4_state *state = data->state; 1962 int ret; 1963 1964 if (!data->rpc_done) { 1965 if (data->rpc_status) 1966 return ERR_PTR(data->rpc_status); 1967 /* cached opens have already been processed */ 1968 goto update; 1969 } 1970 1971 ret = nfs_refresh_inode(inode, &data->f_attr); 1972 if (ret) 1973 return ERR_PTR(ret); 1974 1975 if (data->o_res.delegation_type != 0) 1976 nfs4_opendata_check_deleg(data, state); 1977 update: 1978 if (!update_open_stateid(state, &data->o_res.stateid, 1979 NULL, data->o_arg.fmode)) 1980 return ERR_PTR(-EAGAIN); 1981 refcount_inc(&state->count); 1982 1983 return state; 1984 } 1985 1986 static struct inode * 1987 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1988 { 1989 struct inode *inode; 1990 1991 switch (data->o_arg.claim) { 1992 case NFS4_OPEN_CLAIM_NULL: 1993 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1994 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1995 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1996 return ERR_PTR(-EAGAIN); 1997 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 1998 &data->f_attr, data->f_label); 1999 break; 2000 default: 2001 inode = d_inode(data->dentry); 2002 ihold(inode); 2003 nfs_refresh_inode(inode, &data->f_attr); 2004 } 2005 return inode; 2006 } 2007 2008 static struct nfs4_state * 2009 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2010 { 2011 struct nfs4_state *state; 2012 struct inode *inode; 2013 2014 inode = nfs4_opendata_get_inode(data); 2015 if (IS_ERR(inode)) 2016 return ERR_CAST(inode); 2017 if (data->state != NULL && data->state->inode == inode) { 2018 state = data->state; 2019 refcount_inc(&state->count); 2020 } else 2021 state = nfs4_get_open_state(inode, data->owner); 2022 iput(inode); 2023 if (state == NULL) 2024 state = ERR_PTR(-ENOMEM); 2025 return state; 2026 } 2027 2028 static struct nfs4_state * 2029 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2030 { 2031 struct nfs4_state *state; 2032 2033 if (!data->rpc_done) { 2034 state = nfs4_try_open_cached(data); 2035 trace_nfs4_cached_open(data->state); 2036 goto out; 2037 } 2038 2039 state = nfs4_opendata_find_nfs4_state(data); 2040 if (IS_ERR(state)) 2041 goto out; 2042 2043 if (data->o_res.delegation_type != 0) 2044 nfs4_opendata_check_deleg(data, state); 2045 if (!update_open_stateid(state, &data->o_res.stateid, 2046 NULL, data->o_arg.fmode)) { 2047 nfs4_put_open_state(state); 2048 state = ERR_PTR(-EAGAIN); 2049 } 2050 out: 2051 nfs_release_seqid(data->o_arg.seqid); 2052 return state; 2053 } 2054 2055 static struct nfs4_state * 2056 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2057 { 2058 struct nfs4_state *ret; 2059 2060 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2061 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2062 else 2063 ret = _nfs4_opendata_to_nfs4_state(data); 2064 nfs4_sequence_free_slot(&data->o_res.seq_res); 2065 return ret; 2066 } 2067 2068 static struct nfs_open_context * 2069 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2070 { 2071 struct nfs_inode *nfsi = NFS_I(state->inode); 2072 struct nfs_open_context *ctx; 2073 2074 rcu_read_lock(); 2075 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2076 if (ctx->state != state) 2077 continue; 2078 if ((ctx->mode & mode) != mode) 2079 continue; 2080 if (!get_nfs_open_context(ctx)) 2081 continue; 2082 rcu_read_unlock(); 2083 return ctx; 2084 } 2085 rcu_read_unlock(); 2086 return ERR_PTR(-ENOENT); 2087 } 2088 2089 static struct nfs_open_context * 2090 nfs4_state_find_open_context(struct nfs4_state *state) 2091 { 2092 struct nfs_open_context *ctx; 2093 2094 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2095 if (!IS_ERR(ctx)) 2096 return ctx; 2097 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2098 if (!IS_ERR(ctx)) 2099 return ctx; 2100 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2101 } 2102 2103 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2104 struct nfs4_state *state, enum open_claim_type4 claim) 2105 { 2106 struct nfs4_opendata *opendata; 2107 2108 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2109 NULL, claim, GFP_NOFS); 2110 if (opendata == NULL) 2111 return ERR_PTR(-ENOMEM); 2112 opendata->state = state; 2113 refcount_inc(&state->count); 2114 return opendata; 2115 } 2116 2117 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2118 fmode_t fmode) 2119 { 2120 struct nfs4_state *newstate; 2121 int ret; 2122 2123 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2124 return 0; 2125 opendata->o_arg.open_flags = 0; 2126 opendata->o_arg.fmode = fmode; 2127 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 2128 NFS_SB(opendata->dentry->d_sb), 2129 fmode, 0); 2130 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2131 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2132 nfs4_init_opendata_res(opendata); 2133 ret = _nfs4_recover_proc_open(opendata); 2134 if (ret != 0) 2135 return ret; 2136 newstate = nfs4_opendata_to_nfs4_state(opendata); 2137 if (IS_ERR(newstate)) 2138 return PTR_ERR(newstate); 2139 if (newstate != opendata->state) 2140 ret = -ESTALE; 2141 nfs4_close_state(newstate, fmode); 2142 return ret; 2143 } 2144 2145 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2146 { 2147 int ret; 2148 2149 /* memory barrier prior to reading state->n_* */ 2150 smp_rmb(); 2151 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2152 if (ret != 0) 2153 return ret; 2154 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2155 if (ret != 0) 2156 return ret; 2157 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2158 if (ret != 0) 2159 return ret; 2160 /* 2161 * We may have performed cached opens for all three recoveries. 2162 * Check if we need to update the current stateid. 2163 */ 2164 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2165 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2166 write_seqlock(&state->seqlock); 2167 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2168 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2169 write_sequnlock(&state->seqlock); 2170 } 2171 return 0; 2172 } 2173 2174 /* 2175 * OPEN_RECLAIM: 2176 * reclaim state on the server after a reboot. 2177 */ 2178 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2179 { 2180 struct nfs_delegation *delegation; 2181 struct nfs4_opendata *opendata; 2182 fmode_t delegation_type = 0; 2183 int status; 2184 2185 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2186 NFS4_OPEN_CLAIM_PREVIOUS); 2187 if (IS_ERR(opendata)) 2188 return PTR_ERR(opendata); 2189 rcu_read_lock(); 2190 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2191 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2192 delegation_type = delegation->type; 2193 rcu_read_unlock(); 2194 opendata->o_arg.u.delegation_type = delegation_type; 2195 status = nfs4_open_recover(opendata, state); 2196 nfs4_opendata_put(opendata); 2197 return status; 2198 } 2199 2200 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2201 { 2202 struct nfs_server *server = NFS_SERVER(state->inode); 2203 struct nfs4_exception exception = { }; 2204 int err; 2205 do { 2206 err = _nfs4_do_open_reclaim(ctx, state); 2207 trace_nfs4_open_reclaim(ctx, 0, err); 2208 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2209 continue; 2210 if (err != -NFS4ERR_DELAY) 2211 break; 2212 nfs4_handle_exception(server, err, &exception); 2213 } while (exception.retry); 2214 return err; 2215 } 2216 2217 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2218 { 2219 struct nfs_open_context *ctx; 2220 int ret; 2221 2222 ctx = nfs4_state_find_open_context(state); 2223 if (IS_ERR(ctx)) 2224 return -EAGAIN; 2225 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2226 nfs_state_clear_open_state_flags(state); 2227 ret = nfs4_do_open_reclaim(ctx, state); 2228 put_nfs_open_context(ctx); 2229 return ret; 2230 } 2231 2232 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err) 2233 { 2234 switch (err) { 2235 default: 2236 printk(KERN_ERR "NFS: %s: unhandled error " 2237 "%d.\n", __func__, err); 2238 case 0: 2239 case -ENOENT: 2240 case -EAGAIN: 2241 case -ESTALE: 2242 case -ETIMEDOUT: 2243 break; 2244 case -NFS4ERR_BADSESSION: 2245 case -NFS4ERR_BADSLOT: 2246 case -NFS4ERR_BAD_HIGH_SLOT: 2247 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2248 case -NFS4ERR_DEADSESSION: 2249 return -EAGAIN; 2250 case -NFS4ERR_STALE_CLIENTID: 2251 case -NFS4ERR_STALE_STATEID: 2252 /* Don't recall a delegation if it was lost */ 2253 nfs4_schedule_lease_recovery(server->nfs_client); 2254 return -EAGAIN; 2255 case -NFS4ERR_MOVED: 2256 nfs4_schedule_migration_recovery(server); 2257 return -EAGAIN; 2258 case -NFS4ERR_LEASE_MOVED: 2259 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2260 return -EAGAIN; 2261 case -NFS4ERR_DELEG_REVOKED: 2262 case -NFS4ERR_ADMIN_REVOKED: 2263 case -NFS4ERR_EXPIRED: 2264 case -NFS4ERR_BAD_STATEID: 2265 case -NFS4ERR_OPENMODE: 2266 nfs_inode_find_state_and_recover(state->inode, 2267 stateid); 2268 nfs4_schedule_stateid_recovery(server, state); 2269 return -EAGAIN; 2270 case -NFS4ERR_DELAY: 2271 case -NFS4ERR_GRACE: 2272 ssleep(1); 2273 return -EAGAIN; 2274 case -ENOMEM: 2275 case -NFS4ERR_DENIED: 2276 if (fl) { 2277 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2278 if (lsp) 2279 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2280 } 2281 return 0; 2282 } 2283 return err; 2284 } 2285 2286 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2287 struct nfs4_state *state, const nfs4_stateid *stateid) 2288 { 2289 struct nfs_server *server = NFS_SERVER(state->inode); 2290 struct nfs4_opendata *opendata; 2291 int err = 0; 2292 2293 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2294 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2295 if (IS_ERR(opendata)) 2296 return PTR_ERR(opendata); 2297 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2298 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2299 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2300 if (err) 2301 goto out; 2302 } 2303 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2304 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2305 if (err) 2306 goto out; 2307 } 2308 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2309 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2310 if (err) 2311 goto out; 2312 } 2313 nfs_state_clear_delegation(state); 2314 out: 2315 nfs4_opendata_put(opendata); 2316 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2317 } 2318 2319 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2320 { 2321 struct nfs4_opendata *data = calldata; 2322 2323 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2324 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2325 } 2326 2327 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2328 { 2329 struct nfs4_opendata *data = calldata; 2330 2331 nfs40_sequence_done(task, &data->c_res.seq_res); 2332 2333 data->rpc_status = task->tk_status; 2334 if (data->rpc_status == 0) { 2335 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2336 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2337 renew_lease(data->o_res.server, data->timestamp); 2338 data->rpc_done = true; 2339 } 2340 } 2341 2342 static void nfs4_open_confirm_release(void *calldata) 2343 { 2344 struct nfs4_opendata *data = calldata; 2345 struct nfs4_state *state = NULL; 2346 2347 /* If this request hasn't been cancelled, do nothing */ 2348 if (!data->cancelled) 2349 goto out_free; 2350 /* In case of error, no cleanup! */ 2351 if (!data->rpc_done) 2352 goto out_free; 2353 state = nfs4_opendata_to_nfs4_state(data); 2354 if (!IS_ERR(state)) 2355 nfs4_close_state(state, data->o_arg.fmode); 2356 out_free: 2357 nfs4_opendata_put(data); 2358 } 2359 2360 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2361 .rpc_call_prepare = nfs4_open_confirm_prepare, 2362 .rpc_call_done = nfs4_open_confirm_done, 2363 .rpc_release = nfs4_open_confirm_release, 2364 }; 2365 2366 /* 2367 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2368 */ 2369 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2370 { 2371 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2372 struct rpc_task *task; 2373 struct rpc_message msg = { 2374 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2375 .rpc_argp = &data->c_arg, 2376 .rpc_resp = &data->c_res, 2377 .rpc_cred = data->owner->so_cred, 2378 }; 2379 struct rpc_task_setup task_setup_data = { 2380 .rpc_client = server->client, 2381 .rpc_message = &msg, 2382 .callback_ops = &nfs4_open_confirm_ops, 2383 .callback_data = data, 2384 .workqueue = nfsiod_workqueue, 2385 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2386 }; 2387 int status; 2388 2389 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2390 data->is_recover); 2391 kref_get(&data->kref); 2392 data->rpc_done = false; 2393 data->rpc_status = 0; 2394 data->timestamp = jiffies; 2395 task = rpc_run_task(&task_setup_data); 2396 if (IS_ERR(task)) 2397 return PTR_ERR(task); 2398 status = rpc_wait_for_completion_task(task); 2399 if (status != 0) { 2400 data->cancelled = true; 2401 smp_wmb(); 2402 } else 2403 status = data->rpc_status; 2404 rpc_put_task(task); 2405 return status; 2406 } 2407 2408 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2409 { 2410 struct nfs4_opendata *data = calldata; 2411 struct nfs4_state_owner *sp = data->owner; 2412 struct nfs_client *clp = sp->so_server->nfs_client; 2413 enum open_claim_type4 claim = data->o_arg.claim; 2414 2415 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2416 goto out_wait; 2417 /* 2418 * Check if we still need to send an OPEN call, or if we can use 2419 * a delegation instead. 2420 */ 2421 if (data->state != NULL) { 2422 struct nfs_delegation *delegation; 2423 2424 if (can_open_cached(data->state, data->o_arg.fmode, 2425 data->o_arg.open_flags, claim)) 2426 goto out_no_action; 2427 rcu_read_lock(); 2428 delegation = nfs4_get_valid_delegation(data->state->inode); 2429 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2430 goto unlock_no_action; 2431 rcu_read_unlock(); 2432 } 2433 /* Update client id. */ 2434 data->o_arg.clientid = clp->cl_clientid; 2435 switch (claim) { 2436 default: 2437 break; 2438 case NFS4_OPEN_CLAIM_PREVIOUS: 2439 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2440 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2441 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2442 /* Fall through */ 2443 case NFS4_OPEN_CLAIM_FH: 2444 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2445 } 2446 data->timestamp = jiffies; 2447 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2448 &data->o_arg.seq_args, 2449 &data->o_res.seq_res, 2450 task) != 0) 2451 nfs_release_seqid(data->o_arg.seqid); 2452 2453 /* Set the create mode (note dependency on the session type) */ 2454 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2455 if (data->o_arg.open_flags & O_EXCL) { 2456 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2457 if (nfs4_has_persistent_session(clp)) 2458 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2459 else if (clp->cl_mvops->minor_version > 0) 2460 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2461 } 2462 return; 2463 unlock_no_action: 2464 trace_nfs4_cached_open(data->state); 2465 rcu_read_unlock(); 2466 out_no_action: 2467 task->tk_action = NULL; 2468 out_wait: 2469 nfs4_sequence_done(task, &data->o_res.seq_res); 2470 } 2471 2472 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2473 { 2474 struct nfs4_opendata *data = calldata; 2475 2476 data->rpc_status = task->tk_status; 2477 2478 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2479 return; 2480 2481 if (task->tk_status == 0) { 2482 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2483 switch (data->o_res.f_attr->mode & S_IFMT) { 2484 case S_IFREG: 2485 break; 2486 case S_IFLNK: 2487 data->rpc_status = -ELOOP; 2488 break; 2489 case S_IFDIR: 2490 data->rpc_status = -EISDIR; 2491 break; 2492 default: 2493 data->rpc_status = -ENOTDIR; 2494 } 2495 } 2496 renew_lease(data->o_res.server, data->timestamp); 2497 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2498 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2499 } 2500 data->rpc_done = true; 2501 } 2502 2503 static void nfs4_open_release(void *calldata) 2504 { 2505 struct nfs4_opendata *data = calldata; 2506 struct nfs4_state *state = NULL; 2507 2508 /* If this request hasn't been cancelled, do nothing */ 2509 if (!data->cancelled) 2510 goto out_free; 2511 /* In case of error, no cleanup! */ 2512 if (data->rpc_status != 0 || !data->rpc_done) 2513 goto out_free; 2514 /* In case we need an open_confirm, no cleanup! */ 2515 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2516 goto out_free; 2517 state = nfs4_opendata_to_nfs4_state(data); 2518 if (!IS_ERR(state)) 2519 nfs4_close_state(state, data->o_arg.fmode); 2520 out_free: 2521 nfs4_opendata_put(data); 2522 } 2523 2524 static const struct rpc_call_ops nfs4_open_ops = { 2525 .rpc_call_prepare = nfs4_open_prepare, 2526 .rpc_call_done = nfs4_open_done, 2527 .rpc_release = nfs4_open_release, 2528 }; 2529 2530 static int nfs4_run_open_task(struct nfs4_opendata *data, 2531 struct nfs_open_context *ctx) 2532 { 2533 struct inode *dir = d_inode(data->dir); 2534 struct nfs_server *server = NFS_SERVER(dir); 2535 struct nfs_openargs *o_arg = &data->o_arg; 2536 struct nfs_openres *o_res = &data->o_res; 2537 struct rpc_task *task; 2538 struct rpc_message msg = { 2539 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2540 .rpc_argp = o_arg, 2541 .rpc_resp = o_res, 2542 .rpc_cred = data->owner->so_cred, 2543 }; 2544 struct rpc_task_setup task_setup_data = { 2545 .rpc_client = server->client, 2546 .rpc_message = &msg, 2547 .callback_ops = &nfs4_open_ops, 2548 .callback_data = data, 2549 .workqueue = nfsiod_workqueue, 2550 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2551 }; 2552 int status; 2553 2554 kref_get(&data->kref); 2555 data->rpc_done = false; 2556 data->rpc_status = 0; 2557 data->cancelled = false; 2558 data->is_recover = false; 2559 if (!ctx) { 2560 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2561 data->is_recover = true; 2562 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2563 } else { 2564 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2565 pnfs_lgopen_prepare(data, ctx); 2566 } 2567 task = rpc_run_task(&task_setup_data); 2568 if (IS_ERR(task)) 2569 return PTR_ERR(task); 2570 status = rpc_wait_for_completion_task(task); 2571 if (status != 0) { 2572 data->cancelled = true; 2573 smp_wmb(); 2574 } else 2575 status = data->rpc_status; 2576 rpc_put_task(task); 2577 2578 return status; 2579 } 2580 2581 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2582 { 2583 struct inode *dir = d_inode(data->dir); 2584 struct nfs_openres *o_res = &data->o_res; 2585 int status; 2586 2587 status = nfs4_run_open_task(data, NULL); 2588 if (status != 0 || !data->rpc_done) 2589 return status; 2590 2591 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2592 2593 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2594 status = _nfs4_proc_open_confirm(data); 2595 2596 return status; 2597 } 2598 2599 /* 2600 * Additional permission checks in order to distinguish between an 2601 * open for read, and an open for execute. This works around the 2602 * fact that NFSv4 OPEN treats read and execute permissions as being 2603 * the same. 2604 * Note that in the non-execute case, we want to turn off permission 2605 * checking if we just created a new file (POSIX open() semantics). 2606 */ 2607 static int nfs4_opendata_access(const struct cred *cred, 2608 struct nfs4_opendata *opendata, 2609 struct nfs4_state *state, fmode_t fmode, 2610 int openflags) 2611 { 2612 struct nfs_access_entry cache; 2613 u32 mask, flags; 2614 2615 /* access call failed or for some reason the server doesn't 2616 * support any access modes -- defer access call until later */ 2617 if (opendata->o_res.access_supported == 0) 2618 return 0; 2619 2620 mask = 0; 2621 /* 2622 * Use openflags to check for exec, because fmode won't 2623 * always have FMODE_EXEC set when file open for exec. 2624 */ 2625 if (openflags & __FMODE_EXEC) { 2626 /* ONLY check for exec rights */ 2627 if (S_ISDIR(state->inode->i_mode)) 2628 mask = NFS4_ACCESS_LOOKUP; 2629 else 2630 mask = NFS4_ACCESS_EXECUTE; 2631 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2632 mask = NFS4_ACCESS_READ; 2633 2634 cache.cred = cred; 2635 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2636 nfs_access_add_cache(state->inode, &cache); 2637 2638 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2639 if ((mask & ~cache.mask & flags) == 0) 2640 return 0; 2641 2642 return -EACCES; 2643 } 2644 2645 /* 2646 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2647 */ 2648 static int _nfs4_proc_open(struct nfs4_opendata *data, 2649 struct nfs_open_context *ctx) 2650 { 2651 struct inode *dir = d_inode(data->dir); 2652 struct nfs_server *server = NFS_SERVER(dir); 2653 struct nfs_openargs *o_arg = &data->o_arg; 2654 struct nfs_openres *o_res = &data->o_res; 2655 int status; 2656 2657 status = nfs4_run_open_task(data, ctx); 2658 if (!data->rpc_done) 2659 return status; 2660 if (status != 0) { 2661 if (status == -NFS4ERR_BADNAME && 2662 !(o_arg->open_flags & O_CREAT)) 2663 return -ENOENT; 2664 return status; 2665 } 2666 2667 nfs_fattr_map_and_free_names(server, &data->f_attr); 2668 2669 if (o_arg->open_flags & O_CREAT) { 2670 if (o_arg->open_flags & O_EXCL) 2671 data->file_created = true; 2672 else if (o_res->cinfo.before != o_res->cinfo.after) 2673 data->file_created = true; 2674 if (data->file_created || 2675 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2676 nfs4_update_changeattr(dir, &o_res->cinfo, 2677 o_res->f_attr->time_start, 2678 NFS_INO_INVALID_DATA); 2679 } 2680 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2681 server->caps &= ~NFS_CAP_POSIX_LOCK; 2682 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2683 status = _nfs4_proc_open_confirm(data); 2684 if (status != 0) 2685 return status; 2686 } 2687 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2688 nfs4_sequence_free_slot(&o_res->seq_res); 2689 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, 2690 o_res->f_label, NULL); 2691 } 2692 return 0; 2693 } 2694 2695 /* 2696 * OPEN_EXPIRED: 2697 * reclaim state on the server after a network partition. 2698 * Assumes caller holds the appropriate lock 2699 */ 2700 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2701 { 2702 struct nfs4_opendata *opendata; 2703 int ret; 2704 2705 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2706 NFS4_OPEN_CLAIM_FH); 2707 if (IS_ERR(opendata)) 2708 return PTR_ERR(opendata); 2709 ret = nfs4_open_recover(opendata, state); 2710 if (ret == -ESTALE) 2711 d_drop(ctx->dentry); 2712 nfs4_opendata_put(opendata); 2713 return ret; 2714 } 2715 2716 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2717 { 2718 struct nfs_server *server = NFS_SERVER(state->inode); 2719 struct nfs4_exception exception = { }; 2720 int err; 2721 2722 do { 2723 err = _nfs4_open_expired(ctx, state); 2724 trace_nfs4_open_expired(ctx, 0, err); 2725 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2726 continue; 2727 switch (err) { 2728 default: 2729 goto out; 2730 case -NFS4ERR_GRACE: 2731 case -NFS4ERR_DELAY: 2732 nfs4_handle_exception(server, err, &exception); 2733 err = 0; 2734 } 2735 } while (exception.retry); 2736 out: 2737 return err; 2738 } 2739 2740 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2741 { 2742 struct nfs_open_context *ctx; 2743 int ret; 2744 2745 ctx = nfs4_state_find_open_context(state); 2746 if (IS_ERR(ctx)) 2747 return -EAGAIN; 2748 ret = nfs4_do_open_expired(ctx, state); 2749 put_nfs_open_context(ctx); 2750 return ret; 2751 } 2752 2753 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2754 const nfs4_stateid *stateid) 2755 { 2756 nfs_remove_bad_delegation(state->inode, stateid); 2757 nfs_state_clear_delegation(state); 2758 } 2759 2760 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2761 { 2762 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2763 nfs_finish_clear_delegation_stateid(state, NULL); 2764 } 2765 2766 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2767 { 2768 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2769 nfs40_clear_delegation_stateid(state); 2770 nfs_state_clear_open_state_flags(state); 2771 return nfs4_open_expired(sp, state); 2772 } 2773 2774 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2775 nfs4_stateid *stateid, 2776 const struct cred *cred) 2777 { 2778 return -NFS4ERR_BAD_STATEID; 2779 } 2780 2781 #if defined(CONFIG_NFS_V4_1) 2782 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2783 nfs4_stateid *stateid, 2784 const struct cred *cred) 2785 { 2786 int status; 2787 2788 switch (stateid->type) { 2789 default: 2790 break; 2791 case NFS4_INVALID_STATEID_TYPE: 2792 case NFS4_SPECIAL_STATEID_TYPE: 2793 return -NFS4ERR_BAD_STATEID; 2794 case NFS4_REVOKED_STATEID_TYPE: 2795 goto out_free; 2796 } 2797 2798 status = nfs41_test_stateid(server, stateid, cred); 2799 switch (status) { 2800 case -NFS4ERR_EXPIRED: 2801 case -NFS4ERR_ADMIN_REVOKED: 2802 case -NFS4ERR_DELEG_REVOKED: 2803 break; 2804 default: 2805 return status; 2806 } 2807 out_free: 2808 /* Ack the revoked state to the server */ 2809 nfs41_free_stateid(server, stateid, cred, true); 2810 return -NFS4ERR_EXPIRED; 2811 } 2812 2813 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2814 { 2815 struct nfs_server *server = NFS_SERVER(state->inode); 2816 nfs4_stateid stateid; 2817 struct nfs_delegation *delegation; 2818 const struct cred *cred = NULL; 2819 int status, ret = NFS_OK; 2820 2821 /* Get the delegation credential for use by test/free_stateid */ 2822 rcu_read_lock(); 2823 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2824 if (delegation == NULL) { 2825 rcu_read_unlock(); 2826 nfs_state_clear_delegation(state); 2827 return NFS_OK; 2828 } 2829 2830 spin_lock(&delegation->lock); 2831 nfs4_stateid_copy(&stateid, &delegation->stateid); 2832 2833 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2834 &delegation->flags)) { 2835 spin_unlock(&delegation->lock); 2836 rcu_read_unlock(); 2837 return NFS_OK; 2838 } 2839 2840 if (delegation->cred) 2841 cred = get_cred(delegation->cred); 2842 spin_unlock(&delegation->lock); 2843 rcu_read_unlock(); 2844 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2845 trace_nfs4_test_delegation_stateid(state, NULL, status); 2846 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2847 nfs_finish_clear_delegation_stateid(state, &stateid); 2848 else 2849 ret = status; 2850 2851 put_cred(cred); 2852 return ret; 2853 } 2854 2855 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2856 { 2857 nfs4_stateid tmp; 2858 2859 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2860 nfs4_copy_delegation_stateid(state->inode, state->state, 2861 &tmp, NULL) && 2862 nfs4_stateid_match_other(&state->stateid, &tmp)) 2863 nfs_state_set_delegation(state, &tmp, state->state); 2864 else 2865 nfs_state_clear_delegation(state); 2866 } 2867 2868 /** 2869 * nfs41_check_expired_locks - possibly free a lock stateid 2870 * 2871 * @state: NFSv4 state for an inode 2872 * 2873 * Returns NFS_OK if recovery for this stateid is now finished. 2874 * Otherwise a negative NFS4ERR value is returned. 2875 */ 2876 static int nfs41_check_expired_locks(struct nfs4_state *state) 2877 { 2878 int status, ret = NFS_OK; 2879 struct nfs4_lock_state *lsp, *prev = NULL; 2880 struct nfs_server *server = NFS_SERVER(state->inode); 2881 2882 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2883 goto out; 2884 2885 spin_lock(&state->state_lock); 2886 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2887 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2888 const struct cred *cred = lsp->ls_state->owner->so_cred; 2889 2890 refcount_inc(&lsp->ls_count); 2891 spin_unlock(&state->state_lock); 2892 2893 nfs4_put_lock_state(prev); 2894 prev = lsp; 2895 2896 status = nfs41_test_and_free_expired_stateid(server, 2897 &lsp->ls_stateid, 2898 cred); 2899 trace_nfs4_test_lock_stateid(state, lsp, status); 2900 if (status == -NFS4ERR_EXPIRED || 2901 status == -NFS4ERR_BAD_STATEID) { 2902 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2903 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2904 if (!recover_lost_locks) 2905 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2906 } else if (status != NFS_OK) { 2907 ret = status; 2908 nfs4_put_lock_state(prev); 2909 goto out; 2910 } 2911 spin_lock(&state->state_lock); 2912 } 2913 } 2914 spin_unlock(&state->state_lock); 2915 nfs4_put_lock_state(prev); 2916 out: 2917 return ret; 2918 } 2919 2920 /** 2921 * nfs41_check_open_stateid - possibly free an open stateid 2922 * 2923 * @state: NFSv4 state for an inode 2924 * 2925 * Returns NFS_OK if recovery for this stateid is now finished. 2926 * Otherwise a negative NFS4ERR value is returned. 2927 */ 2928 static int nfs41_check_open_stateid(struct nfs4_state *state) 2929 { 2930 struct nfs_server *server = NFS_SERVER(state->inode); 2931 nfs4_stateid *stateid = &state->open_stateid; 2932 const struct cred *cred = state->owner->so_cred; 2933 int status; 2934 2935 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2936 return -NFS4ERR_BAD_STATEID; 2937 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2938 trace_nfs4_test_open_stateid(state, NULL, status); 2939 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2940 nfs_state_clear_open_state_flags(state); 2941 stateid->type = NFS4_INVALID_STATEID_TYPE; 2942 return status; 2943 } 2944 if (nfs_open_stateid_recover_openmode(state)) 2945 return -NFS4ERR_OPENMODE; 2946 return NFS_OK; 2947 } 2948 2949 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2950 { 2951 int status; 2952 2953 status = nfs41_check_delegation_stateid(state); 2954 if (status != NFS_OK) 2955 return status; 2956 nfs41_delegation_recover_stateid(state); 2957 2958 status = nfs41_check_expired_locks(state); 2959 if (status != NFS_OK) 2960 return status; 2961 status = nfs41_check_open_stateid(state); 2962 if (status != NFS_OK) 2963 status = nfs4_open_expired(sp, state); 2964 return status; 2965 } 2966 #endif 2967 2968 /* 2969 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2970 * fields corresponding to attributes that were used to store the verifier. 2971 * Make sure we clobber those fields in the later setattr call 2972 */ 2973 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2974 struct iattr *sattr, struct nfs4_label **label) 2975 { 2976 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2977 __u32 attrset[3]; 2978 unsigned ret; 2979 unsigned i; 2980 2981 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 2982 attrset[i] = opendata->o_res.attrset[i]; 2983 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 2984 attrset[i] &= ~bitmask[i]; 2985 } 2986 2987 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 2988 sattr->ia_valid : 0; 2989 2990 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 2991 if (sattr->ia_valid & ATTR_ATIME_SET) 2992 ret |= ATTR_ATIME_SET; 2993 else 2994 ret |= ATTR_ATIME; 2995 } 2996 2997 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 2998 if (sattr->ia_valid & ATTR_MTIME_SET) 2999 ret |= ATTR_MTIME_SET; 3000 else 3001 ret |= ATTR_MTIME; 3002 } 3003 3004 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3005 *label = NULL; 3006 return ret; 3007 } 3008 3009 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3010 int flags, struct nfs_open_context *ctx) 3011 { 3012 struct nfs4_state_owner *sp = opendata->owner; 3013 struct nfs_server *server = sp->so_server; 3014 struct dentry *dentry; 3015 struct nfs4_state *state; 3016 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3017 struct inode *dir = d_inode(opendata->dir); 3018 unsigned long dir_verifier; 3019 unsigned int seq; 3020 int ret; 3021 3022 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3023 dir_verifier = nfs_save_change_attribute(dir); 3024 3025 ret = _nfs4_proc_open(opendata, ctx); 3026 if (ret != 0) 3027 goto out; 3028 3029 state = _nfs4_opendata_to_nfs4_state(opendata); 3030 ret = PTR_ERR(state); 3031 if (IS_ERR(state)) 3032 goto out; 3033 ctx->state = state; 3034 if (server->caps & NFS_CAP_POSIX_LOCK) 3035 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3036 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3037 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3038 3039 dentry = opendata->dentry; 3040 if (d_really_is_negative(dentry)) { 3041 struct dentry *alias; 3042 d_drop(dentry); 3043 alias = d_exact_alias(dentry, state->inode); 3044 if (!alias) 3045 alias = d_splice_alias(igrab(state->inode), dentry); 3046 /* d_splice_alias() can't fail here - it's a non-directory */ 3047 if (alias) { 3048 dput(ctx->dentry); 3049 ctx->dentry = dentry = alias; 3050 } 3051 } 3052 3053 switch(opendata->o_arg.claim) { 3054 default: 3055 break; 3056 case NFS4_OPEN_CLAIM_NULL: 3057 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3058 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3059 if (!opendata->rpc_done) 3060 break; 3061 if (opendata->o_res.delegation_type != 0) 3062 dir_verifier = nfs_save_change_attribute(dir); 3063 nfs_set_verifier(dentry, dir_verifier); 3064 } 3065 3066 /* Parse layoutget results before we check for access */ 3067 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3068 3069 ret = nfs4_opendata_access(sp->so_cred, opendata, state, 3070 acc_mode, flags); 3071 if (ret != 0) 3072 goto out; 3073 3074 if (d_inode(dentry) == state->inode) { 3075 nfs_inode_attach_open_context(ctx); 3076 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3077 nfs4_schedule_stateid_recovery(server, state); 3078 } 3079 3080 out: 3081 if (!opendata->cancelled) 3082 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3083 return ret; 3084 } 3085 3086 /* 3087 * Returns a referenced nfs4_state 3088 */ 3089 static int _nfs4_do_open(struct inode *dir, 3090 struct nfs_open_context *ctx, 3091 int flags, 3092 const struct nfs4_open_createattrs *c, 3093 int *opened) 3094 { 3095 struct nfs4_state_owner *sp; 3096 struct nfs4_state *state = NULL; 3097 struct nfs_server *server = NFS_SERVER(dir); 3098 struct nfs4_opendata *opendata; 3099 struct dentry *dentry = ctx->dentry; 3100 const struct cred *cred = ctx->cred; 3101 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3102 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3103 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3104 struct iattr *sattr = c->sattr; 3105 struct nfs4_label *label = c->label; 3106 struct nfs4_label *olabel = NULL; 3107 int status; 3108 3109 /* Protect against reboot recovery conflicts */ 3110 status = -ENOMEM; 3111 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3112 if (sp == NULL) { 3113 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3114 goto out_err; 3115 } 3116 status = nfs4_client_recover_expired_lease(server->nfs_client); 3117 if (status != 0) 3118 goto err_put_state_owner; 3119 if (d_really_is_positive(dentry)) 3120 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3121 status = -ENOMEM; 3122 if (d_really_is_positive(dentry)) 3123 claim = NFS4_OPEN_CLAIM_FH; 3124 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3125 c, claim, GFP_KERNEL); 3126 if (opendata == NULL) 3127 goto err_put_state_owner; 3128 3129 if (label) { 3130 olabel = nfs4_label_alloc(server, GFP_KERNEL); 3131 if (IS_ERR(olabel)) { 3132 status = PTR_ERR(olabel); 3133 goto err_opendata_put; 3134 } 3135 } 3136 3137 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3138 if (!opendata->f_attr.mdsthreshold) { 3139 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3140 if (!opendata->f_attr.mdsthreshold) 3141 goto err_free_label; 3142 } 3143 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3144 } 3145 if (d_really_is_positive(dentry)) 3146 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3147 3148 status = _nfs4_open_and_get_state(opendata, flags, ctx); 3149 if (status != 0) 3150 goto err_free_label; 3151 state = ctx->state; 3152 3153 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3154 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3155 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3156 /* 3157 * send create attributes which was not set by open 3158 * with an extra setattr. 3159 */ 3160 if (attrs || label) { 3161 unsigned ia_old = sattr->ia_valid; 3162 3163 sattr->ia_valid = attrs; 3164 nfs_fattr_init(opendata->o_res.f_attr); 3165 status = nfs4_do_setattr(state->inode, cred, 3166 opendata->o_res.f_attr, sattr, 3167 ctx, label, olabel); 3168 if (status == 0) { 3169 nfs_setattr_update_inode(state->inode, sattr, 3170 opendata->o_res.f_attr); 3171 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 3172 } 3173 sattr->ia_valid = ia_old; 3174 } 3175 } 3176 if (opened && opendata->file_created) 3177 *opened = 1; 3178 3179 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3180 *ctx_th = opendata->f_attr.mdsthreshold; 3181 opendata->f_attr.mdsthreshold = NULL; 3182 } 3183 3184 nfs4_label_free(olabel); 3185 3186 nfs4_opendata_put(opendata); 3187 nfs4_put_state_owner(sp); 3188 return 0; 3189 err_free_label: 3190 nfs4_label_free(olabel); 3191 err_opendata_put: 3192 nfs4_opendata_put(opendata); 3193 err_put_state_owner: 3194 nfs4_put_state_owner(sp); 3195 out_err: 3196 return status; 3197 } 3198 3199 3200 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3201 struct nfs_open_context *ctx, 3202 int flags, 3203 struct iattr *sattr, 3204 struct nfs4_label *label, 3205 int *opened) 3206 { 3207 struct nfs_server *server = NFS_SERVER(dir); 3208 struct nfs4_exception exception = { 3209 .interruptible = true, 3210 }; 3211 struct nfs4_state *res; 3212 struct nfs4_open_createattrs c = { 3213 .label = label, 3214 .sattr = sattr, 3215 .verf = { 3216 [0] = (__u32)jiffies, 3217 [1] = (__u32)current->pid, 3218 }, 3219 }; 3220 int status; 3221 3222 do { 3223 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3224 res = ctx->state; 3225 trace_nfs4_open_file(ctx, flags, status); 3226 if (status == 0) 3227 break; 3228 /* NOTE: BAD_SEQID means the server and client disagree about the 3229 * book-keeping w.r.t. state-changing operations 3230 * (OPEN/CLOSE/LOCK/LOCKU...) 3231 * It is actually a sign of a bug on the client or on the server. 3232 * 3233 * If we receive a BAD_SEQID error in the particular case of 3234 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3235 * have unhashed the old state_owner for us, and that we can 3236 * therefore safely retry using a new one. We should still warn 3237 * the user though... 3238 */ 3239 if (status == -NFS4ERR_BAD_SEQID) { 3240 pr_warn_ratelimited("NFS: v4 server %s " 3241 " returned a bad sequence-id error!\n", 3242 NFS_SERVER(dir)->nfs_client->cl_hostname); 3243 exception.retry = 1; 3244 continue; 3245 } 3246 /* 3247 * BAD_STATEID on OPEN means that the server cancelled our 3248 * state before it received the OPEN_CONFIRM. 3249 * Recover by retrying the request as per the discussion 3250 * on Page 181 of RFC3530. 3251 */ 3252 if (status == -NFS4ERR_BAD_STATEID) { 3253 exception.retry = 1; 3254 continue; 3255 } 3256 if (status == -NFS4ERR_EXPIRED) { 3257 nfs4_schedule_lease_recovery(server->nfs_client); 3258 exception.retry = 1; 3259 continue; 3260 } 3261 if (status == -EAGAIN) { 3262 /* We must have found a delegation */ 3263 exception.retry = 1; 3264 continue; 3265 } 3266 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3267 continue; 3268 res = ERR_PTR(nfs4_handle_exception(server, 3269 status, &exception)); 3270 } while (exception.retry); 3271 return res; 3272 } 3273 3274 static int _nfs4_do_setattr(struct inode *inode, 3275 struct nfs_setattrargs *arg, 3276 struct nfs_setattrres *res, 3277 const struct cred *cred, 3278 struct nfs_open_context *ctx) 3279 { 3280 struct nfs_server *server = NFS_SERVER(inode); 3281 struct rpc_message msg = { 3282 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3283 .rpc_argp = arg, 3284 .rpc_resp = res, 3285 .rpc_cred = cred, 3286 }; 3287 const struct cred *delegation_cred = NULL; 3288 unsigned long timestamp = jiffies; 3289 bool truncate; 3290 int status; 3291 3292 nfs_fattr_init(res->fattr); 3293 3294 /* Servers should only apply open mode checks for file size changes */ 3295 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3296 if (!truncate) 3297 goto zero_stateid; 3298 3299 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3300 /* Use that stateid */ 3301 } else if (ctx != NULL && ctx->state) { 3302 struct nfs_lock_context *l_ctx; 3303 if (!nfs4_valid_open_stateid(ctx->state)) 3304 return -EBADF; 3305 l_ctx = nfs_get_lock_context(ctx); 3306 if (IS_ERR(l_ctx)) 3307 return PTR_ERR(l_ctx); 3308 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3309 &arg->stateid, &delegation_cred); 3310 nfs_put_lock_context(l_ctx); 3311 if (status == -EIO) 3312 return -EBADF; 3313 else if (status == -EAGAIN) 3314 goto zero_stateid; 3315 } else { 3316 zero_stateid: 3317 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3318 } 3319 if (delegation_cred) 3320 msg.rpc_cred = delegation_cred; 3321 3322 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3323 3324 put_cred(delegation_cred); 3325 if (status == 0 && ctx != NULL) 3326 renew_lease(server, timestamp); 3327 trace_nfs4_setattr(inode, &arg->stateid, status); 3328 return status; 3329 } 3330 3331 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3332 struct nfs_fattr *fattr, struct iattr *sattr, 3333 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 3334 struct nfs4_label *olabel) 3335 { 3336 struct nfs_server *server = NFS_SERVER(inode); 3337 __u32 bitmask[NFS4_BITMASK_SZ]; 3338 struct nfs4_state *state = ctx ? ctx->state : NULL; 3339 struct nfs_setattrargs arg = { 3340 .fh = NFS_FH(inode), 3341 .iap = sattr, 3342 .server = server, 3343 .bitmask = bitmask, 3344 .label = ilabel, 3345 }; 3346 struct nfs_setattrres res = { 3347 .fattr = fattr, 3348 .label = olabel, 3349 .server = server, 3350 }; 3351 struct nfs4_exception exception = { 3352 .state = state, 3353 .inode = inode, 3354 .stateid = &arg.stateid, 3355 }; 3356 int err; 3357 3358 do { 3359 nfs4_bitmap_copy_adjust_setattr(bitmask, 3360 nfs4_bitmask(server, olabel), 3361 inode); 3362 3363 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3364 switch (err) { 3365 case -NFS4ERR_OPENMODE: 3366 if (!(sattr->ia_valid & ATTR_SIZE)) { 3367 pr_warn_once("NFSv4: server %s is incorrectly " 3368 "applying open mode checks to " 3369 "a SETATTR that is not " 3370 "changing file size.\n", 3371 server->nfs_client->cl_hostname); 3372 } 3373 if (state && !(state->state & FMODE_WRITE)) { 3374 err = -EBADF; 3375 if (sattr->ia_valid & ATTR_OPEN) 3376 err = -EACCES; 3377 goto out; 3378 } 3379 } 3380 err = nfs4_handle_exception(server, err, &exception); 3381 } while (exception.retry); 3382 out: 3383 return err; 3384 } 3385 3386 static bool 3387 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3388 { 3389 if (inode == NULL || !nfs_have_layout(inode)) 3390 return false; 3391 3392 return pnfs_wait_on_layoutreturn(inode, task); 3393 } 3394 3395 /* 3396 * Update the seqid of an open stateid 3397 */ 3398 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3399 struct nfs4_state *state) 3400 { 3401 __be32 seqid_open; 3402 u32 dst_seqid; 3403 int seq; 3404 3405 for (;;) { 3406 if (!nfs4_valid_open_stateid(state)) 3407 break; 3408 seq = read_seqbegin(&state->seqlock); 3409 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3410 nfs4_stateid_copy(dst, &state->open_stateid); 3411 if (read_seqretry(&state->seqlock, seq)) 3412 continue; 3413 break; 3414 } 3415 seqid_open = state->open_stateid.seqid; 3416 if (read_seqretry(&state->seqlock, seq)) 3417 continue; 3418 3419 dst_seqid = be32_to_cpu(dst->seqid); 3420 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3421 dst->seqid = seqid_open; 3422 break; 3423 } 3424 } 3425 3426 /* 3427 * Update the seqid of an open stateid after receiving 3428 * NFS4ERR_OLD_STATEID 3429 */ 3430 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3431 struct nfs4_state *state) 3432 { 3433 __be32 seqid_open; 3434 u32 dst_seqid; 3435 bool ret; 3436 int seq; 3437 3438 for (;;) { 3439 ret = false; 3440 if (!nfs4_valid_open_stateid(state)) 3441 break; 3442 seq = read_seqbegin(&state->seqlock); 3443 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3444 if (read_seqretry(&state->seqlock, seq)) 3445 continue; 3446 break; 3447 } 3448 seqid_open = state->open_stateid.seqid; 3449 if (read_seqretry(&state->seqlock, seq)) 3450 continue; 3451 3452 dst_seqid = be32_to_cpu(dst->seqid); 3453 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0) 3454 dst->seqid = cpu_to_be32(dst_seqid + 1); 3455 else 3456 dst->seqid = seqid_open; 3457 ret = true; 3458 break; 3459 } 3460 3461 return ret; 3462 } 3463 3464 struct nfs4_closedata { 3465 struct inode *inode; 3466 struct nfs4_state *state; 3467 struct nfs_closeargs arg; 3468 struct nfs_closeres res; 3469 struct { 3470 struct nfs4_layoutreturn_args arg; 3471 struct nfs4_layoutreturn_res res; 3472 struct nfs4_xdr_opaque_data ld_private; 3473 u32 roc_barrier; 3474 bool roc; 3475 } lr; 3476 struct nfs_fattr fattr; 3477 unsigned long timestamp; 3478 }; 3479 3480 static void nfs4_free_closedata(void *data) 3481 { 3482 struct nfs4_closedata *calldata = data; 3483 struct nfs4_state_owner *sp = calldata->state->owner; 3484 struct super_block *sb = calldata->state->inode->i_sb; 3485 3486 if (calldata->lr.roc) 3487 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3488 calldata->res.lr_ret); 3489 nfs4_put_open_state(calldata->state); 3490 nfs_free_seqid(calldata->arg.seqid); 3491 nfs4_put_state_owner(sp); 3492 nfs_sb_deactive(sb); 3493 kfree(calldata); 3494 } 3495 3496 static void nfs4_close_done(struct rpc_task *task, void *data) 3497 { 3498 struct nfs4_closedata *calldata = data; 3499 struct nfs4_state *state = calldata->state; 3500 struct nfs_server *server = NFS_SERVER(calldata->inode); 3501 nfs4_stateid *res_stateid = NULL; 3502 struct nfs4_exception exception = { 3503 .state = state, 3504 .inode = calldata->inode, 3505 .stateid = &calldata->arg.stateid, 3506 }; 3507 3508 dprintk("%s: begin!\n", __func__); 3509 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3510 return; 3511 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3512 3513 /* Handle Layoutreturn errors */ 3514 if (pnfs_roc_done(task, calldata->inode, 3515 &calldata->arg.lr_args, 3516 &calldata->res.lr_res, 3517 &calldata->res.lr_ret) == -EAGAIN) 3518 goto out_restart; 3519 3520 /* hmm. we are done with the inode, and in the process of freeing 3521 * the state_owner. we keep this around to process errors 3522 */ 3523 switch (task->tk_status) { 3524 case 0: 3525 res_stateid = &calldata->res.stateid; 3526 renew_lease(server, calldata->timestamp); 3527 break; 3528 case -NFS4ERR_ACCESS: 3529 if (calldata->arg.bitmask != NULL) { 3530 calldata->arg.bitmask = NULL; 3531 calldata->res.fattr = NULL; 3532 goto out_restart; 3533 3534 } 3535 break; 3536 case -NFS4ERR_OLD_STATEID: 3537 /* Did we race with OPEN? */ 3538 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3539 state)) 3540 goto out_restart; 3541 goto out_release; 3542 case -NFS4ERR_ADMIN_REVOKED: 3543 case -NFS4ERR_STALE_STATEID: 3544 case -NFS4ERR_EXPIRED: 3545 nfs4_free_revoked_stateid(server, 3546 &calldata->arg.stateid, 3547 task->tk_msg.rpc_cred); 3548 /* Fallthrough */ 3549 case -NFS4ERR_BAD_STATEID: 3550 if (calldata->arg.fmode == 0) 3551 break; 3552 /* Fallthrough */ 3553 default: 3554 task->tk_status = nfs4_async_handle_exception(task, 3555 server, task->tk_status, &exception); 3556 if (exception.retry) 3557 goto out_restart; 3558 } 3559 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3560 res_stateid, calldata->arg.fmode); 3561 out_release: 3562 task->tk_status = 0; 3563 nfs_release_seqid(calldata->arg.seqid); 3564 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3565 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 3566 return; 3567 out_restart: 3568 task->tk_status = 0; 3569 rpc_restart_call_prepare(task); 3570 goto out_release; 3571 } 3572 3573 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3574 { 3575 struct nfs4_closedata *calldata = data; 3576 struct nfs4_state *state = calldata->state; 3577 struct inode *inode = calldata->inode; 3578 struct pnfs_layout_hdr *lo; 3579 bool is_rdonly, is_wronly, is_rdwr; 3580 int call_close = 0; 3581 3582 dprintk("%s: begin!\n", __func__); 3583 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3584 goto out_wait; 3585 3586 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3587 spin_lock(&state->owner->so_lock); 3588 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3589 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3590 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3591 /* Calculate the change in open mode */ 3592 calldata->arg.fmode = 0; 3593 if (state->n_rdwr == 0) { 3594 if (state->n_rdonly == 0) 3595 call_close |= is_rdonly; 3596 else if (is_rdonly) 3597 calldata->arg.fmode |= FMODE_READ; 3598 if (state->n_wronly == 0) 3599 call_close |= is_wronly; 3600 else if (is_wronly) 3601 calldata->arg.fmode |= FMODE_WRITE; 3602 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3603 call_close |= is_rdwr; 3604 } else if (is_rdwr) 3605 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3606 3607 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3608 if (!nfs4_valid_open_stateid(state)) 3609 call_close = 0; 3610 spin_unlock(&state->owner->so_lock); 3611 3612 if (!call_close) { 3613 /* Note: exit _without_ calling nfs4_close_done */ 3614 goto out_no_action; 3615 } 3616 3617 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3618 nfs_release_seqid(calldata->arg.seqid); 3619 goto out_wait; 3620 } 3621 3622 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3623 if (lo && !pnfs_layout_is_valid(lo)) { 3624 calldata->arg.lr_args = NULL; 3625 calldata->res.lr_res = NULL; 3626 } 3627 3628 if (calldata->arg.fmode == 0) 3629 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3630 3631 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3632 /* Close-to-open cache consistency revalidation */ 3633 if (!nfs4_have_delegation(inode, FMODE_READ)) 3634 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3635 else 3636 calldata->arg.bitmask = NULL; 3637 } 3638 3639 calldata->arg.share_access = 3640 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3641 calldata->arg.fmode, 0); 3642 3643 if (calldata->res.fattr == NULL) 3644 calldata->arg.bitmask = NULL; 3645 else if (calldata->arg.bitmask == NULL) 3646 calldata->res.fattr = NULL; 3647 calldata->timestamp = jiffies; 3648 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3649 &calldata->arg.seq_args, 3650 &calldata->res.seq_res, 3651 task) != 0) 3652 nfs_release_seqid(calldata->arg.seqid); 3653 dprintk("%s: done!\n", __func__); 3654 return; 3655 out_no_action: 3656 task->tk_action = NULL; 3657 out_wait: 3658 nfs4_sequence_done(task, &calldata->res.seq_res); 3659 } 3660 3661 static const struct rpc_call_ops nfs4_close_ops = { 3662 .rpc_call_prepare = nfs4_close_prepare, 3663 .rpc_call_done = nfs4_close_done, 3664 .rpc_release = nfs4_free_closedata, 3665 }; 3666 3667 /* 3668 * It is possible for data to be read/written from a mem-mapped file 3669 * after the sys_close call (which hits the vfs layer as a flush). 3670 * This means that we can't safely call nfsv4 close on a file until 3671 * the inode is cleared. This in turn means that we are not good 3672 * NFSv4 citizens - we do not indicate to the server to update the file's 3673 * share state even when we are done with one of the three share 3674 * stateid's in the inode. 3675 * 3676 * NOTE: Caller must be holding the sp->so_owner semaphore! 3677 */ 3678 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3679 { 3680 struct nfs_server *server = NFS_SERVER(state->inode); 3681 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3682 struct nfs4_closedata *calldata; 3683 struct nfs4_state_owner *sp = state->owner; 3684 struct rpc_task *task; 3685 struct rpc_message msg = { 3686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3687 .rpc_cred = state->owner->so_cred, 3688 }; 3689 struct rpc_task_setup task_setup_data = { 3690 .rpc_client = server->client, 3691 .rpc_message = &msg, 3692 .callback_ops = &nfs4_close_ops, 3693 .workqueue = nfsiod_workqueue, 3694 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3695 }; 3696 int status = -ENOMEM; 3697 3698 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3699 &task_setup_data.rpc_client, &msg); 3700 3701 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3702 if (calldata == NULL) 3703 goto out; 3704 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3705 calldata->inode = state->inode; 3706 calldata->state = state; 3707 calldata->arg.fh = NFS_FH(state->inode); 3708 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3709 goto out_free_calldata; 3710 /* Serialization for the sequence id */ 3711 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3712 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3713 if (IS_ERR(calldata->arg.seqid)) 3714 goto out_free_calldata; 3715 nfs_fattr_init(&calldata->fattr); 3716 calldata->arg.fmode = 0; 3717 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3718 calldata->res.fattr = &calldata->fattr; 3719 calldata->res.seqid = calldata->arg.seqid; 3720 calldata->res.server = server; 3721 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3722 calldata->lr.roc = pnfs_roc(state->inode, 3723 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3724 if (calldata->lr.roc) { 3725 calldata->arg.lr_args = &calldata->lr.arg; 3726 calldata->res.lr_res = &calldata->lr.res; 3727 } 3728 nfs_sb_active(calldata->inode->i_sb); 3729 3730 msg.rpc_argp = &calldata->arg; 3731 msg.rpc_resp = &calldata->res; 3732 task_setup_data.callback_data = calldata; 3733 task = rpc_run_task(&task_setup_data); 3734 if (IS_ERR(task)) 3735 return PTR_ERR(task); 3736 status = 0; 3737 if (wait) 3738 status = rpc_wait_for_completion_task(task); 3739 rpc_put_task(task); 3740 return status; 3741 out_free_calldata: 3742 kfree(calldata); 3743 out: 3744 nfs4_put_open_state(state); 3745 nfs4_put_state_owner(sp); 3746 return status; 3747 } 3748 3749 static struct inode * 3750 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3751 int open_flags, struct iattr *attr, int *opened) 3752 { 3753 struct nfs4_state *state; 3754 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3755 3756 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3757 3758 /* Protect against concurrent sillydeletes */ 3759 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3760 3761 nfs4_label_release_security(label); 3762 3763 if (IS_ERR(state)) 3764 return ERR_CAST(state); 3765 return state->inode; 3766 } 3767 3768 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3769 { 3770 if (ctx->state == NULL) 3771 return; 3772 if (is_sync) 3773 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3774 else 3775 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3776 } 3777 3778 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3779 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3780 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3781 3782 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3783 { 3784 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3785 struct nfs4_server_caps_arg args = { 3786 .fhandle = fhandle, 3787 .bitmask = bitmask, 3788 }; 3789 struct nfs4_server_caps_res res = {}; 3790 struct rpc_message msg = { 3791 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3792 .rpc_argp = &args, 3793 .rpc_resp = &res, 3794 }; 3795 int status; 3796 int i; 3797 3798 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3799 FATTR4_WORD0_FH_EXPIRE_TYPE | 3800 FATTR4_WORD0_LINK_SUPPORT | 3801 FATTR4_WORD0_SYMLINK_SUPPORT | 3802 FATTR4_WORD0_ACLSUPPORT; 3803 if (minorversion) 3804 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3805 3806 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3807 if (status == 0) { 3808 /* Sanity check the server answers */ 3809 switch (minorversion) { 3810 case 0: 3811 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3812 res.attr_bitmask[2] = 0; 3813 break; 3814 case 1: 3815 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3816 break; 3817 case 2: 3818 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3819 } 3820 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3821 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3822 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3823 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3824 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3825 NFS_CAP_CTIME|NFS_CAP_MTIME| 3826 NFS_CAP_SECURITY_LABEL); 3827 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3828 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3829 server->caps |= NFS_CAP_ACLS; 3830 if (res.has_links != 0) 3831 server->caps |= NFS_CAP_HARDLINKS; 3832 if (res.has_symlinks != 0) 3833 server->caps |= NFS_CAP_SYMLINKS; 3834 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3835 server->caps |= NFS_CAP_FILEID; 3836 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3837 server->caps |= NFS_CAP_MODE; 3838 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3839 server->caps |= NFS_CAP_NLINK; 3840 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3841 server->caps |= NFS_CAP_OWNER; 3842 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3843 server->caps |= NFS_CAP_OWNER_GROUP; 3844 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3845 server->caps |= NFS_CAP_ATIME; 3846 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3847 server->caps |= NFS_CAP_CTIME; 3848 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3849 server->caps |= NFS_CAP_MTIME; 3850 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3851 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3852 server->caps |= NFS_CAP_SECURITY_LABEL; 3853 #endif 3854 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3855 sizeof(server->attr_bitmask)); 3856 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3857 3858 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3859 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3860 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3861 server->cache_consistency_bitmask[2] = 0; 3862 3863 /* Avoid a regression due to buggy server */ 3864 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3865 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3866 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3867 sizeof(server->exclcreat_bitmask)); 3868 3869 server->acl_bitmask = res.acl_bitmask; 3870 server->fh_expire_type = res.fh_expire_type; 3871 } 3872 3873 return status; 3874 } 3875 3876 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3877 { 3878 struct nfs4_exception exception = { 3879 .interruptible = true, 3880 }; 3881 int err; 3882 do { 3883 err = nfs4_handle_exception(server, 3884 _nfs4_server_capabilities(server, fhandle), 3885 &exception); 3886 } while (exception.retry); 3887 return err; 3888 } 3889 3890 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3891 struct nfs_fsinfo *info) 3892 { 3893 u32 bitmask[3]; 3894 struct nfs4_lookup_root_arg args = { 3895 .bitmask = bitmask, 3896 }; 3897 struct nfs4_lookup_res res = { 3898 .server = server, 3899 .fattr = info->fattr, 3900 .fh = fhandle, 3901 }; 3902 struct rpc_message msg = { 3903 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3904 .rpc_argp = &args, 3905 .rpc_resp = &res, 3906 }; 3907 3908 bitmask[0] = nfs4_fattr_bitmap[0]; 3909 bitmask[1] = nfs4_fattr_bitmap[1]; 3910 /* 3911 * Process the label in the upcoming getfattr 3912 */ 3913 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3914 3915 nfs_fattr_init(info->fattr); 3916 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3917 } 3918 3919 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3920 struct nfs_fsinfo *info) 3921 { 3922 struct nfs4_exception exception = { 3923 .interruptible = true, 3924 }; 3925 int err; 3926 do { 3927 err = _nfs4_lookup_root(server, fhandle, info); 3928 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3929 switch (err) { 3930 case 0: 3931 case -NFS4ERR_WRONGSEC: 3932 goto out; 3933 default: 3934 err = nfs4_handle_exception(server, err, &exception); 3935 } 3936 } while (exception.retry); 3937 out: 3938 return err; 3939 } 3940 3941 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3942 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3943 { 3944 struct rpc_auth_create_args auth_args = { 3945 .pseudoflavor = flavor, 3946 }; 3947 struct rpc_auth *auth; 3948 3949 auth = rpcauth_create(&auth_args, server->client); 3950 if (IS_ERR(auth)) 3951 return -EACCES; 3952 return nfs4_lookup_root(server, fhandle, info); 3953 } 3954 3955 /* 3956 * Retry pseudoroot lookup with various security flavors. We do this when: 3957 * 3958 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3959 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3960 * 3961 * Returns zero on success, or a negative NFS4ERR value, or a 3962 * negative errno value. 3963 */ 3964 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3965 struct nfs_fsinfo *info) 3966 { 3967 /* Per 3530bis 15.33.5 */ 3968 static const rpc_authflavor_t flav_array[] = { 3969 RPC_AUTH_GSS_KRB5P, 3970 RPC_AUTH_GSS_KRB5I, 3971 RPC_AUTH_GSS_KRB5, 3972 RPC_AUTH_UNIX, /* courtesy */ 3973 RPC_AUTH_NULL, 3974 }; 3975 int status = -EPERM; 3976 size_t i; 3977 3978 if (server->auth_info.flavor_len > 0) { 3979 /* try each flavor specified by user */ 3980 for (i = 0; i < server->auth_info.flavor_len; i++) { 3981 status = nfs4_lookup_root_sec(server, fhandle, info, 3982 server->auth_info.flavors[i]); 3983 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3984 continue; 3985 break; 3986 } 3987 } else { 3988 /* no flavors specified by user, try default list */ 3989 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3990 status = nfs4_lookup_root_sec(server, fhandle, info, 3991 flav_array[i]); 3992 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3993 continue; 3994 break; 3995 } 3996 } 3997 3998 /* 3999 * -EACCES could mean that the user doesn't have correct permissions 4000 * to access the mount. It could also mean that we tried to mount 4001 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4002 * existing mount programs don't handle -EACCES very well so it should 4003 * be mapped to -EPERM instead. 4004 */ 4005 if (status == -EACCES) 4006 status = -EPERM; 4007 return status; 4008 } 4009 4010 /** 4011 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4012 * @server: initialized nfs_server handle 4013 * @fhandle: we fill in the pseudo-fs root file handle 4014 * @info: we fill in an FSINFO struct 4015 * @auth_probe: probe the auth flavours 4016 * 4017 * Returns zero on success, or a negative errno. 4018 */ 4019 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4020 struct nfs_fsinfo *info, 4021 bool auth_probe) 4022 { 4023 int status = 0; 4024 4025 if (!auth_probe) 4026 status = nfs4_lookup_root(server, fhandle, info); 4027 4028 if (auth_probe || status == NFS4ERR_WRONGSEC) 4029 status = server->nfs_client->cl_mvops->find_root_sec(server, 4030 fhandle, info); 4031 4032 if (status == 0) 4033 status = nfs4_server_capabilities(server, fhandle); 4034 if (status == 0) 4035 status = nfs4_do_fsinfo(server, fhandle, info); 4036 4037 return nfs4_map_errors(status); 4038 } 4039 4040 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4041 struct nfs_fsinfo *info) 4042 { 4043 int error; 4044 struct nfs_fattr *fattr = info->fattr; 4045 struct nfs4_label *label = fattr->label; 4046 4047 error = nfs4_server_capabilities(server, mntfh); 4048 if (error < 0) { 4049 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4050 return error; 4051 } 4052 4053 error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL); 4054 if (error < 0) { 4055 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4056 goto out; 4057 } 4058 4059 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4060 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4061 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4062 4063 out: 4064 return error; 4065 } 4066 4067 /* 4068 * Get locations and (maybe) other attributes of a referral. 4069 * Note that we'll actually follow the referral later when 4070 * we detect fsid mismatch in inode revalidation 4071 */ 4072 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4073 const struct qstr *name, struct nfs_fattr *fattr, 4074 struct nfs_fh *fhandle) 4075 { 4076 int status = -ENOMEM; 4077 struct page *page = NULL; 4078 struct nfs4_fs_locations *locations = NULL; 4079 4080 page = alloc_page(GFP_KERNEL); 4081 if (page == NULL) 4082 goto out; 4083 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4084 if (locations == NULL) 4085 goto out; 4086 4087 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4088 if (status != 0) 4089 goto out; 4090 4091 /* 4092 * If the fsid didn't change, this is a migration event, not a 4093 * referral. Cause us to drop into the exception handler, which 4094 * will kick off migration recovery. 4095 */ 4096 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 4097 dprintk("%s: server did not return a different fsid for" 4098 " a referral at %s\n", __func__, name->name); 4099 status = -NFS4ERR_MOVED; 4100 goto out; 4101 } 4102 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4103 nfs_fixup_referral_attributes(&locations->fattr); 4104 4105 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 4106 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 4107 memset(fhandle, 0, sizeof(struct nfs_fh)); 4108 out: 4109 if (page) 4110 __free_page(page); 4111 kfree(locations); 4112 return status; 4113 } 4114 4115 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4116 struct nfs_fattr *fattr, struct nfs4_label *label, 4117 struct inode *inode) 4118 { 4119 __u32 bitmask[NFS4_BITMASK_SZ]; 4120 struct nfs4_getattr_arg args = { 4121 .fh = fhandle, 4122 .bitmask = bitmask, 4123 }; 4124 struct nfs4_getattr_res res = { 4125 .fattr = fattr, 4126 .label = label, 4127 .server = server, 4128 }; 4129 struct rpc_message msg = { 4130 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4131 .rpc_argp = &args, 4132 .rpc_resp = &res, 4133 }; 4134 unsigned short task_flags = 0; 4135 4136 /* Is this is an attribute revalidation, subject to softreval? */ 4137 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4138 task_flags |= RPC_TASK_TIMEOUT; 4139 4140 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode); 4141 4142 nfs_fattr_init(fattr); 4143 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4144 return nfs4_do_call_sync(server->client, server, &msg, 4145 &args.seq_args, &res.seq_res, task_flags); 4146 } 4147 4148 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4149 struct nfs_fattr *fattr, struct nfs4_label *label, 4150 struct inode *inode) 4151 { 4152 struct nfs4_exception exception = { 4153 .interruptible = true, 4154 }; 4155 int err; 4156 do { 4157 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode); 4158 trace_nfs4_getattr(server, fhandle, fattr, err); 4159 err = nfs4_handle_exception(server, err, 4160 &exception); 4161 } while (exception.retry); 4162 return err; 4163 } 4164 4165 /* 4166 * The file is not closed if it is opened due to the a request to change 4167 * the size of the file. The open call will not be needed once the 4168 * VFS layer lookup-intents are implemented. 4169 * 4170 * Close is called when the inode is destroyed. 4171 * If we haven't opened the file for O_WRONLY, we 4172 * need to in the size_change case to obtain a stateid. 4173 * 4174 * Got race? 4175 * Because OPEN is always done by name in nfsv4, it is 4176 * possible that we opened a different file by the same 4177 * name. We can recognize this race condition, but we 4178 * can't do anything about it besides returning an error. 4179 * 4180 * This will be fixed with VFS changes (lookup-intent). 4181 */ 4182 static int 4183 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4184 struct iattr *sattr) 4185 { 4186 struct inode *inode = d_inode(dentry); 4187 const struct cred *cred = NULL; 4188 struct nfs_open_context *ctx = NULL; 4189 struct nfs4_label *label = NULL; 4190 int status; 4191 4192 if (pnfs_ld_layoutret_on_setattr(inode) && 4193 sattr->ia_valid & ATTR_SIZE && 4194 sattr->ia_size < i_size_read(inode)) 4195 pnfs_commit_and_return_layout(inode); 4196 4197 nfs_fattr_init(fattr); 4198 4199 /* Deal with open(O_TRUNC) */ 4200 if (sattr->ia_valid & ATTR_OPEN) 4201 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4202 4203 /* Optimization: if the end result is no change, don't RPC */ 4204 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4205 return 0; 4206 4207 /* Search for an existing open(O_WRITE) file */ 4208 if (sattr->ia_valid & ATTR_FILE) { 4209 4210 ctx = nfs_file_open_context(sattr->ia_file); 4211 if (ctx) 4212 cred = ctx->cred; 4213 } 4214 4215 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 4216 if (IS_ERR(label)) 4217 return PTR_ERR(label); 4218 4219 /* Return any delegations if we're going to change ACLs */ 4220 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4221 nfs4_inode_make_writeable(inode); 4222 4223 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label); 4224 if (status == 0) { 4225 nfs_setattr_update_inode(inode, sattr, fattr); 4226 nfs_setsecurity(inode, fattr, label); 4227 } 4228 nfs4_label_free(label); 4229 return status; 4230 } 4231 4232 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4233 struct dentry *dentry, struct nfs_fh *fhandle, 4234 struct nfs_fattr *fattr, struct nfs4_label *label) 4235 { 4236 struct nfs_server *server = NFS_SERVER(dir); 4237 int status; 4238 struct nfs4_lookup_arg args = { 4239 .bitmask = server->attr_bitmask, 4240 .dir_fh = NFS_FH(dir), 4241 .name = &dentry->d_name, 4242 }; 4243 struct nfs4_lookup_res res = { 4244 .server = server, 4245 .fattr = fattr, 4246 .label = label, 4247 .fh = fhandle, 4248 }; 4249 struct rpc_message msg = { 4250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4251 .rpc_argp = &args, 4252 .rpc_resp = &res, 4253 }; 4254 unsigned short task_flags = 0; 4255 4256 /* Is this is an attribute revalidation, subject to softreval? */ 4257 if (nfs_lookup_is_soft_revalidate(dentry)) 4258 task_flags |= RPC_TASK_TIMEOUT; 4259 4260 args.bitmask = nfs4_bitmask(server, label); 4261 4262 nfs_fattr_init(fattr); 4263 4264 dprintk("NFS call lookup %pd2\n", dentry); 4265 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4266 status = nfs4_do_call_sync(clnt, server, &msg, 4267 &args.seq_args, &res.seq_res, task_flags); 4268 dprintk("NFS reply lookup: %d\n", status); 4269 return status; 4270 } 4271 4272 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4273 { 4274 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4275 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4276 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4277 fattr->nlink = 2; 4278 } 4279 4280 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4281 struct dentry *dentry, struct nfs_fh *fhandle, 4282 struct nfs_fattr *fattr, struct nfs4_label *label) 4283 { 4284 struct nfs4_exception exception = { 4285 .interruptible = true, 4286 }; 4287 struct rpc_clnt *client = *clnt; 4288 const struct qstr *name = &dentry->d_name; 4289 int err; 4290 do { 4291 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label); 4292 trace_nfs4_lookup(dir, name, err); 4293 switch (err) { 4294 case -NFS4ERR_BADNAME: 4295 err = -ENOENT; 4296 goto out; 4297 case -NFS4ERR_MOVED: 4298 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4299 if (err == -NFS4ERR_MOVED) 4300 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4301 goto out; 4302 case -NFS4ERR_WRONGSEC: 4303 err = -EPERM; 4304 if (client != *clnt) 4305 goto out; 4306 client = nfs4_negotiate_security(client, dir, name); 4307 if (IS_ERR(client)) 4308 return PTR_ERR(client); 4309 4310 exception.retry = 1; 4311 break; 4312 default: 4313 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4314 } 4315 } while (exception.retry); 4316 4317 out: 4318 if (err == 0) 4319 *clnt = client; 4320 else if (client != *clnt) 4321 rpc_shutdown_client(client); 4322 4323 return err; 4324 } 4325 4326 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4327 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4328 struct nfs4_label *label) 4329 { 4330 int status; 4331 struct rpc_clnt *client = NFS_CLIENT(dir); 4332 4333 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label); 4334 if (client != NFS_CLIENT(dir)) { 4335 rpc_shutdown_client(client); 4336 nfs_fixup_secinfo_attributes(fattr); 4337 } 4338 return status; 4339 } 4340 4341 struct rpc_clnt * 4342 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4343 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4344 { 4345 struct rpc_clnt *client = NFS_CLIENT(dir); 4346 int status; 4347 4348 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL); 4349 if (status < 0) 4350 return ERR_PTR(status); 4351 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4352 } 4353 4354 static int _nfs4_proc_lookupp(struct inode *inode, 4355 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4356 struct nfs4_label *label) 4357 { 4358 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4359 struct nfs_server *server = NFS_SERVER(inode); 4360 int status; 4361 struct nfs4_lookupp_arg args = { 4362 .bitmask = server->attr_bitmask, 4363 .fh = NFS_FH(inode), 4364 }; 4365 struct nfs4_lookupp_res res = { 4366 .server = server, 4367 .fattr = fattr, 4368 .label = label, 4369 .fh = fhandle, 4370 }; 4371 struct rpc_message msg = { 4372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4373 .rpc_argp = &args, 4374 .rpc_resp = &res, 4375 }; 4376 4377 args.bitmask = nfs4_bitmask(server, label); 4378 4379 nfs_fattr_init(fattr); 4380 4381 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4382 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4383 &res.seq_res, 0); 4384 dprintk("NFS reply lookupp: %d\n", status); 4385 return status; 4386 } 4387 4388 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4389 struct nfs_fattr *fattr, struct nfs4_label *label) 4390 { 4391 struct nfs4_exception exception = { 4392 .interruptible = true, 4393 }; 4394 int err; 4395 do { 4396 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label); 4397 trace_nfs4_lookupp(inode, err); 4398 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4399 &exception); 4400 } while (exception.retry); 4401 return err; 4402 } 4403 4404 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4405 { 4406 struct nfs_server *server = NFS_SERVER(inode); 4407 struct nfs4_accessargs args = { 4408 .fh = NFS_FH(inode), 4409 .access = entry->mask, 4410 }; 4411 struct nfs4_accessres res = { 4412 .server = server, 4413 }; 4414 struct rpc_message msg = { 4415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4416 .rpc_argp = &args, 4417 .rpc_resp = &res, 4418 .rpc_cred = entry->cred, 4419 }; 4420 int status = 0; 4421 4422 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4423 res.fattr = nfs_alloc_fattr(); 4424 if (res.fattr == NULL) 4425 return -ENOMEM; 4426 args.bitmask = server->cache_consistency_bitmask; 4427 } 4428 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4429 if (!status) { 4430 nfs_access_set_mask(entry, res.access); 4431 if (res.fattr) 4432 nfs_refresh_inode(inode, res.fattr); 4433 } 4434 nfs_free_fattr(res.fattr); 4435 return status; 4436 } 4437 4438 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4439 { 4440 struct nfs4_exception exception = { 4441 .interruptible = true, 4442 }; 4443 int err; 4444 do { 4445 err = _nfs4_proc_access(inode, entry); 4446 trace_nfs4_access(inode, err); 4447 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4448 &exception); 4449 } while (exception.retry); 4450 return err; 4451 } 4452 4453 /* 4454 * TODO: For the time being, we don't try to get any attributes 4455 * along with any of the zero-copy operations READ, READDIR, 4456 * READLINK, WRITE. 4457 * 4458 * In the case of the first three, we want to put the GETATTR 4459 * after the read-type operation -- this is because it is hard 4460 * to predict the length of a GETATTR response in v4, and thus 4461 * align the READ data correctly. This means that the GETATTR 4462 * may end up partially falling into the page cache, and we should 4463 * shift it into the 'tail' of the xdr_buf before processing. 4464 * To do this efficiently, we need to know the total length 4465 * of data received, which doesn't seem to be available outside 4466 * of the RPC layer. 4467 * 4468 * In the case of WRITE, we also want to put the GETATTR after 4469 * the operation -- in this case because we want to make sure 4470 * we get the post-operation mtime and size. 4471 * 4472 * Both of these changes to the XDR layer would in fact be quite 4473 * minor, but I decided to leave them for a subsequent patch. 4474 */ 4475 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4476 unsigned int pgbase, unsigned int pglen) 4477 { 4478 struct nfs4_readlink args = { 4479 .fh = NFS_FH(inode), 4480 .pgbase = pgbase, 4481 .pglen = pglen, 4482 .pages = &page, 4483 }; 4484 struct nfs4_readlink_res res; 4485 struct rpc_message msg = { 4486 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4487 .rpc_argp = &args, 4488 .rpc_resp = &res, 4489 }; 4490 4491 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4492 } 4493 4494 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4495 unsigned int pgbase, unsigned int pglen) 4496 { 4497 struct nfs4_exception exception = { 4498 .interruptible = true, 4499 }; 4500 int err; 4501 do { 4502 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4503 trace_nfs4_readlink(inode, err); 4504 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4505 &exception); 4506 } while (exception.retry); 4507 return err; 4508 } 4509 4510 /* 4511 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4512 */ 4513 static int 4514 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4515 int flags) 4516 { 4517 struct nfs_server *server = NFS_SERVER(dir); 4518 struct nfs4_label l, *ilabel = NULL; 4519 struct nfs_open_context *ctx; 4520 struct nfs4_state *state; 4521 int status = 0; 4522 4523 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4524 if (IS_ERR(ctx)) 4525 return PTR_ERR(ctx); 4526 4527 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4528 4529 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4530 sattr->ia_mode &= ~current_umask(); 4531 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4532 if (IS_ERR(state)) { 4533 status = PTR_ERR(state); 4534 goto out; 4535 } 4536 out: 4537 nfs4_label_release_security(ilabel); 4538 put_nfs_open_context(ctx); 4539 return status; 4540 } 4541 4542 static int 4543 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4544 { 4545 struct nfs_server *server = NFS_SERVER(dir); 4546 struct nfs_removeargs args = { 4547 .fh = NFS_FH(dir), 4548 .name = *name, 4549 }; 4550 struct nfs_removeres res = { 4551 .server = server, 4552 }; 4553 struct rpc_message msg = { 4554 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4555 .rpc_argp = &args, 4556 .rpc_resp = &res, 4557 }; 4558 unsigned long timestamp = jiffies; 4559 int status; 4560 4561 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4562 if (status == 0) { 4563 spin_lock(&dir->i_lock); 4564 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4565 NFS_INO_INVALID_DATA); 4566 /* Removing a directory decrements nlink in the parent */ 4567 if (ftype == NF4DIR && dir->i_nlink > 2) 4568 nfs4_dec_nlink_locked(dir); 4569 spin_unlock(&dir->i_lock); 4570 } 4571 return status; 4572 } 4573 4574 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4575 { 4576 struct nfs4_exception exception = { 4577 .interruptible = true, 4578 }; 4579 struct inode *inode = d_inode(dentry); 4580 int err; 4581 4582 if (inode) { 4583 if (inode->i_nlink == 1) 4584 nfs4_inode_return_delegation(inode); 4585 else 4586 nfs4_inode_make_writeable(inode); 4587 } 4588 do { 4589 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4590 trace_nfs4_remove(dir, &dentry->d_name, err); 4591 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4592 &exception); 4593 } while (exception.retry); 4594 return err; 4595 } 4596 4597 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4598 { 4599 struct nfs4_exception exception = { 4600 .interruptible = true, 4601 }; 4602 int err; 4603 4604 do { 4605 err = _nfs4_proc_remove(dir, name, NF4DIR); 4606 trace_nfs4_remove(dir, name, err); 4607 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4608 &exception); 4609 } while (exception.retry); 4610 return err; 4611 } 4612 4613 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4614 struct dentry *dentry, 4615 struct inode *inode) 4616 { 4617 struct nfs_removeargs *args = msg->rpc_argp; 4618 struct nfs_removeres *res = msg->rpc_resp; 4619 4620 res->server = NFS_SB(dentry->d_sb); 4621 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4622 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4623 4624 nfs_fattr_init(res->dir_attr); 4625 4626 if (inode) 4627 nfs4_inode_return_delegation(inode); 4628 } 4629 4630 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4631 { 4632 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4633 &data->args.seq_args, 4634 &data->res.seq_res, 4635 task); 4636 } 4637 4638 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4639 { 4640 struct nfs_unlinkdata *data = task->tk_calldata; 4641 struct nfs_removeres *res = &data->res; 4642 4643 if (!nfs4_sequence_done(task, &res->seq_res)) 4644 return 0; 4645 if (nfs4_async_handle_error(task, res->server, NULL, 4646 &data->timeout) == -EAGAIN) 4647 return 0; 4648 if (task->tk_status == 0) 4649 nfs4_update_changeattr(dir, &res->cinfo, 4650 res->dir_attr->time_start, 4651 NFS_INO_INVALID_DATA); 4652 return 1; 4653 } 4654 4655 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4656 struct dentry *old_dentry, 4657 struct dentry *new_dentry) 4658 { 4659 struct nfs_renameargs *arg = msg->rpc_argp; 4660 struct nfs_renameres *res = msg->rpc_resp; 4661 struct inode *old_inode = d_inode(old_dentry); 4662 struct inode *new_inode = d_inode(new_dentry); 4663 4664 if (old_inode) 4665 nfs4_inode_make_writeable(old_inode); 4666 if (new_inode) 4667 nfs4_inode_return_delegation(new_inode); 4668 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4669 res->server = NFS_SB(old_dentry->d_sb); 4670 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4671 } 4672 4673 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4674 { 4675 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4676 &data->args.seq_args, 4677 &data->res.seq_res, 4678 task); 4679 } 4680 4681 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4682 struct inode *new_dir) 4683 { 4684 struct nfs_renamedata *data = task->tk_calldata; 4685 struct nfs_renameres *res = &data->res; 4686 4687 if (!nfs4_sequence_done(task, &res->seq_res)) 4688 return 0; 4689 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4690 return 0; 4691 4692 if (task->tk_status == 0) { 4693 if (new_dir != old_dir) { 4694 /* Note: If we moved a directory, nlink will change */ 4695 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4696 res->old_fattr->time_start, 4697 NFS_INO_INVALID_OTHER | 4698 NFS_INO_INVALID_DATA); 4699 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4700 res->new_fattr->time_start, 4701 NFS_INO_INVALID_OTHER | 4702 NFS_INO_INVALID_DATA); 4703 } else 4704 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4705 res->old_fattr->time_start, 4706 NFS_INO_INVALID_DATA); 4707 } 4708 return 1; 4709 } 4710 4711 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4712 { 4713 struct nfs_server *server = NFS_SERVER(inode); 4714 __u32 bitmask[NFS4_BITMASK_SZ]; 4715 struct nfs4_link_arg arg = { 4716 .fh = NFS_FH(inode), 4717 .dir_fh = NFS_FH(dir), 4718 .name = name, 4719 .bitmask = bitmask, 4720 }; 4721 struct nfs4_link_res res = { 4722 .server = server, 4723 .label = NULL, 4724 }; 4725 struct rpc_message msg = { 4726 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4727 .rpc_argp = &arg, 4728 .rpc_resp = &res, 4729 }; 4730 int status = -ENOMEM; 4731 4732 res.fattr = nfs_alloc_fattr(); 4733 if (res.fattr == NULL) 4734 goto out; 4735 4736 res.label = nfs4_label_alloc(server, GFP_KERNEL); 4737 if (IS_ERR(res.label)) { 4738 status = PTR_ERR(res.label); 4739 goto out; 4740 } 4741 4742 nfs4_inode_make_writeable(inode); 4743 nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode); 4744 4745 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4746 if (!status) { 4747 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4748 NFS_INO_INVALID_DATA); 4749 status = nfs_post_op_update_inode(inode, res.fattr); 4750 if (!status) 4751 nfs_setsecurity(inode, res.fattr, res.label); 4752 } 4753 4754 4755 nfs4_label_free(res.label); 4756 4757 out: 4758 nfs_free_fattr(res.fattr); 4759 return status; 4760 } 4761 4762 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4763 { 4764 struct nfs4_exception exception = { 4765 .interruptible = true, 4766 }; 4767 int err; 4768 do { 4769 err = nfs4_handle_exception(NFS_SERVER(inode), 4770 _nfs4_proc_link(inode, dir, name), 4771 &exception); 4772 } while (exception.retry); 4773 return err; 4774 } 4775 4776 struct nfs4_createdata { 4777 struct rpc_message msg; 4778 struct nfs4_create_arg arg; 4779 struct nfs4_create_res res; 4780 struct nfs_fh fh; 4781 struct nfs_fattr fattr; 4782 struct nfs4_label *label; 4783 }; 4784 4785 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4786 const struct qstr *name, struct iattr *sattr, u32 ftype) 4787 { 4788 struct nfs4_createdata *data; 4789 4790 data = kzalloc(sizeof(*data), GFP_KERNEL); 4791 if (data != NULL) { 4792 struct nfs_server *server = NFS_SERVER(dir); 4793 4794 data->label = nfs4_label_alloc(server, GFP_KERNEL); 4795 if (IS_ERR(data->label)) 4796 goto out_free; 4797 4798 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4799 data->msg.rpc_argp = &data->arg; 4800 data->msg.rpc_resp = &data->res; 4801 data->arg.dir_fh = NFS_FH(dir); 4802 data->arg.server = server; 4803 data->arg.name = name; 4804 data->arg.attrs = sattr; 4805 data->arg.ftype = ftype; 4806 data->arg.bitmask = nfs4_bitmask(server, data->label); 4807 data->arg.umask = current_umask(); 4808 data->res.server = server; 4809 data->res.fh = &data->fh; 4810 data->res.fattr = &data->fattr; 4811 data->res.label = data->label; 4812 nfs_fattr_init(data->res.fattr); 4813 } 4814 return data; 4815 out_free: 4816 kfree(data); 4817 return NULL; 4818 } 4819 4820 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4821 { 4822 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4823 &data->arg.seq_args, &data->res.seq_res, 1); 4824 if (status == 0) { 4825 spin_lock(&dir->i_lock); 4826 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4827 data->res.fattr->time_start, 4828 NFS_INO_INVALID_DATA); 4829 /* Creating a directory bumps nlink in the parent */ 4830 if (data->arg.ftype == NF4DIR) 4831 nfs4_inc_nlink_locked(dir); 4832 spin_unlock(&dir->i_lock); 4833 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 4834 } 4835 return status; 4836 } 4837 4838 static void nfs4_free_createdata(struct nfs4_createdata *data) 4839 { 4840 nfs4_label_free(data->label); 4841 kfree(data); 4842 } 4843 4844 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4845 struct page *page, unsigned int len, struct iattr *sattr, 4846 struct nfs4_label *label) 4847 { 4848 struct nfs4_createdata *data; 4849 int status = -ENAMETOOLONG; 4850 4851 if (len > NFS4_MAXPATHLEN) 4852 goto out; 4853 4854 status = -ENOMEM; 4855 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 4856 if (data == NULL) 4857 goto out; 4858 4859 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 4860 data->arg.u.symlink.pages = &page; 4861 data->arg.u.symlink.len = len; 4862 data->arg.label = label; 4863 4864 status = nfs4_do_create(dir, dentry, data); 4865 4866 nfs4_free_createdata(data); 4867 out: 4868 return status; 4869 } 4870 4871 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4872 struct page *page, unsigned int len, struct iattr *sattr) 4873 { 4874 struct nfs4_exception exception = { 4875 .interruptible = true, 4876 }; 4877 struct nfs4_label l, *label = NULL; 4878 int err; 4879 4880 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4881 4882 do { 4883 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4884 trace_nfs4_symlink(dir, &dentry->d_name, err); 4885 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4886 &exception); 4887 } while (exception.retry); 4888 4889 nfs4_label_release_security(label); 4890 return err; 4891 } 4892 4893 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4894 struct iattr *sattr, struct nfs4_label *label) 4895 { 4896 struct nfs4_createdata *data; 4897 int status = -ENOMEM; 4898 4899 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4900 if (data == NULL) 4901 goto out; 4902 4903 data->arg.label = label; 4904 status = nfs4_do_create(dir, dentry, data); 4905 4906 nfs4_free_createdata(data); 4907 out: 4908 return status; 4909 } 4910 4911 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4912 struct iattr *sattr) 4913 { 4914 struct nfs_server *server = NFS_SERVER(dir); 4915 struct nfs4_exception exception = { 4916 .interruptible = true, 4917 }; 4918 struct nfs4_label l, *label = NULL; 4919 int err; 4920 4921 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4922 4923 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4924 sattr->ia_mode &= ~current_umask(); 4925 do { 4926 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4927 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4928 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4929 &exception); 4930 } while (exception.retry); 4931 nfs4_label_release_security(label); 4932 4933 return err; 4934 } 4935 4936 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred, 4937 u64 cookie, struct page **pages, unsigned int count, bool plus) 4938 { 4939 struct inode *dir = d_inode(dentry); 4940 struct nfs4_readdir_arg args = { 4941 .fh = NFS_FH(dir), 4942 .pages = pages, 4943 .pgbase = 0, 4944 .count = count, 4945 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4946 .plus = plus, 4947 }; 4948 struct nfs4_readdir_res res; 4949 struct rpc_message msg = { 4950 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4951 .rpc_argp = &args, 4952 .rpc_resp = &res, 4953 .rpc_cred = cred, 4954 }; 4955 int status; 4956 4957 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4958 dentry, 4959 (unsigned long long)cookie); 4960 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4961 res.pgbase = args.pgbase; 4962 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4963 if (status >= 0) { 4964 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4965 status += args.pgbase; 4966 } 4967 4968 nfs_invalidate_atime(dir); 4969 4970 dprintk("%s: returns %d\n", __func__, status); 4971 return status; 4972 } 4973 4974 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred, 4975 u64 cookie, struct page **pages, unsigned int count, bool plus) 4976 { 4977 struct nfs4_exception exception = { 4978 .interruptible = true, 4979 }; 4980 int err; 4981 do { 4982 err = _nfs4_proc_readdir(dentry, cred, cookie, 4983 pages, count, plus); 4984 trace_nfs4_readdir(d_inode(dentry), err); 4985 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4986 &exception); 4987 } while (exception.retry); 4988 return err; 4989 } 4990 4991 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4992 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4993 { 4994 struct nfs4_createdata *data; 4995 int mode = sattr->ia_mode; 4996 int status = -ENOMEM; 4997 4998 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4999 if (data == NULL) 5000 goto out; 5001 5002 if (S_ISFIFO(mode)) 5003 data->arg.ftype = NF4FIFO; 5004 else if (S_ISBLK(mode)) { 5005 data->arg.ftype = NF4BLK; 5006 data->arg.u.device.specdata1 = MAJOR(rdev); 5007 data->arg.u.device.specdata2 = MINOR(rdev); 5008 } 5009 else if (S_ISCHR(mode)) { 5010 data->arg.ftype = NF4CHR; 5011 data->arg.u.device.specdata1 = MAJOR(rdev); 5012 data->arg.u.device.specdata2 = MINOR(rdev); 5013 } else if (!S_ISSOCK(mode)) { 5014 status = -EINVAL; 5015 goto out_free; 5016 } 5017 5018 data->arg.label = label; 5019 status = nfs4_do_create(dir, dentry, data); 5020 out_free: 5021 nfs4_free_createdata(data); 5022 out: 5023 return status; 5024 } 5025 5026 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5027 struct iattr *sattr, dev_t rdev) 5028 { 5029 struct nfs_server *server = NFS_SERVER(dir); 5030 struct nfs4_exception exception = { 5031 .interruptible = true, 5032 }; 5033 struct nfs4_label l, *label = NULL; 5034 int err; 5035 5036 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5037 5038 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5039 sattr->ia_mode &= ~current_umask(); 5040 do { 5041 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5042 trace_nfs4_mknod(dir, &dentry->d_name, err); 5043 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5044 &exception); 5045 } while (exception.retry); 5046 5047 nfs4_label_release_security(label); 5048 5049 return err; 5050 } 5051 5052 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5053 struct nfs_fsstat *fsstat) 5054 { 5055 struct nfs4_statfs_arg args = { 5056 .fh = fhandle, 5057 .bitmask = server->attr_bitmask, 5058 }; 5059 struct nfs4_statfs_res res = { 5060 .fsstat = fsstat, 5061 }; 5062 struct rpc_message msg = { 5063 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5064 .rpc_argp = &args, 5065 .rpc_resp = &res, 5066 }; 5067 5068 nfs_fattr_init(fsstat->fattr); 5069 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5070 } 5071 5072 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5073 { 5074 struct nfs4_exception exception = { 5075 .interruptible = true, 5076 }; 5077 int err; 5078 do { 5079 err = nfs4_handle_exception(server, 5080 _nfs4_proc_statfs(server, fhandle, fsstat), 5081 &exception); 5082 } while (exception.retry); 5083 return err; 5084 } 5085 5086 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5087 struct nfs_fsinfo *fsinfo) 5088 { 5089 struct nfs4_fsinfo_arg args = { 5090 .fh = fhandle, 5091 .bitmask = server->attr_bitmask, 5092 }; 5093 struct nfs4_fsinfo_res res = { 5094 .fsinfo = fsinfo, 5095 }; 5096 struct rpc_message msg = { 5097 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5098 .rpc_argp = &args, 5099 .rpc_resp = &res, 5100 }; 5101 5102 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5103 } 5104 5105 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5106 { 5107 struct nfs4_exception exception = { 5108 .interruptible = true, 5109 }; 5110 int err; 5111 5112 do { 5113 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5114 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5115 if (err == 0) { 5116 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5117 break; 5118 } 5119 err = nfs4_handle_exception(server, err, &exception); 5120 } while (exception.retry); 5121 return err; 5122 } 5123 5124 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5125 { 5126 int error; 5127 5128 nfs_fattr_init(fsinfo->fattr); 5129 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5130 if (error == 0) { 5131 /* block layout checks this! */ 5132 server->pnfs_blksize = fsinfo->blksize; 5133 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5134 } 5135 5136 return error; 5137 } 5138 5139 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5140 struct nfs_pathconf *pathconf) 5141 { 5142 struct nfs4_pathconf_arg args = { 5143 .fh = fhandle, 5144 .bitmask = server->attr_bitmask, 5145 }; 5146 struct nfs4_pathconf_res res = { 5147 .pathconf = pathconf, 5148 }; 5149 struct rpc_message msg = { 5150 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5151 .rpc_argp = &args, 5152 .rpc_resp = &res, 5153 }; 5154 5155 /* None of the pathconf attributes are mandatory to implement */ 5156 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5157 memset(pathconf, 0, sizeof(*pathconf)); 5158 return 0; 5159 } 5160 5161 nfs_fattr_init(pathconf->fattr); 5162 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5163 } 5164 5165 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5166 struct nfs_pathconf *pathconf) 5167 { 5168 struct nfs4_exception exception = { 5169 .interruptible = true, 5170 }; 5171 int err; 5172 5173 do { 5174 err = nfs4_handle_exception(server, 5175 _nfs4_proc_pathconf(server, fhandle, pathconf), 5176 &exception); 5177 } while (exception.retry); 5178 return err; 5179 } 5180 5181 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5182 const struct nfs_open_context *ctx, 5183 const struct nfs_lock_context *l_ctx, 5184 fmode_t fmode) 5185 { 5186 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5187 } 5188 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5189 5190 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5191 const struct nfs_open_context *ctx, 5192 const struct nfs_lock_context *l_ctx, 5193 fmode_t fmode) 5194 { 5195 nfs4_stateid _current_stateid; 5196 5197 /* If the current stateid represents a lost lock, then exit */ 5198 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5199 return true; 5200 return nfs4_stateid_match(stateid, &_current_stateid); 5201 } 5202 5203 static bool nfs4_error_stateid_expired(int err) 5204 { 5205 switch (err) { 5206 case -NFS4ERR_DELEG_REVOKED: 5207 case -NFS4ERR_ADMIN_REVOKED: 5208 case -NFS4ERR_BAD_STATEID: 5209 case -NFS4ERR_STALE_STATEID: 5210 case -NFS4ERR_OLD_STATEID: 5211 case -NFS4ERR_OPENMODE: 5212 case -NFS4ERR_EXPIRED: 5213 return true; 5214 } 5215 return false; 5216 } 5217 5218 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5219 { 5220 struct nfs_server *server = NFS_SERVER(hdr->inode); 5221 5222 trace_nfs4_read(hdr, task->tk_status); 5223 if (task->tk_status < 0) { 5224 struct nfs4_exception exception = { 5225 .inode = hdr->inode, 5226 .state = hdr->args.context->state, 5227 .stateid = &hdr->args.stateid, 5228 }; 5229 task->tk_status = nfs4_async_handle_exception(task, 5230 server, task->tk_status, &exception); 5231 if (exception.retry) { 5232 rpc_restart_call_prepare(task); 5233 return -EAGAIN; 5234 } 5235 } 5236 5237 if (task->tk_status > 0) 5238 renew_lease(server, hdr->timestamp); 5239 return 0; 5240 } 5241 5242 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5243 struct nfs_pgio_args *args) 5244 { 5245 5246 if (!nfs4_error_stateid_expired(task->tk_status) || 5247 nfs4_stateid_is_current(&args->stateid, 5248 args->context, 5249 args->lock_context, 5250 FMODE_READ)) 5251 return false; 5252 rpc_restart_call_prepare(task); 5253 return true; 5254 } 5255 5256 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5257 { 5258 5259 dprintk("--> %s\n", __func__); 5260 5261 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5262 return -EAGAIN; 5263 if (nfs4_read_stateid_changed(task, &hdr->args)) 5264 return -EAGAIN; 5265 if (task->tk_status > 0) 5266 nfs_invalidate_atime(hdr->inode); 5267 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5268 nfs4_read_done_cb(task, hdr); 5269 } 5270 5271 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5272 struct rpc_message *msg) 5273 { 5274 hdr->timestamp = jiffies; 5275 if (!hdr->pgio_done_cb) 5276 hdr->pgio_done_cb = nfs4_read_done_cb; 5277 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5278 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5279 } 5280 5281 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5282 struct nfs_pgio_header *hdr) 5283 { 5284 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5285 &hdr->args.seq_args, 5286 &hdr->res.seq_res, 5287 task)) 5288 return 0; 5289 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5290 hdr->args.lock_context, 5291 hdr->rw_mode) == -EIO) 5292 return -EIO; 5293 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5294 return -EIO; 5295 return 0; 5296 } 5297 5298 static int nfs4_write_done_cb(struct rpc_task *task, 5299 struct nfs_pgio_header *hdr) 5300 { 5301 struct inode *inode = hdr->inode; 5302 5303 trace_nfs4_write(hdr, task->tk_status); 5304 if (task->tk_status < 0) { 5305 struct nfs4_exception exception = { 5306 .inode = hdr->inode, 5307 .state = hdr->args.context->state, 5308 .stateid = &hdr->args.stateid, 5309 }; 5310 task->tk_status = nfs4_async_handle_exception(task, 5311 NFS_SERVER(inode), task->tk_status, 5312 &exception); 5313 if (exception.retry) { 5314 rpc_restart_call_prepare(task); 5315 return -EAGAIN; 5316 } 5317 } 5318 if (task->tk_status >= 0) { 5319 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5320 nfs_writeback_update_inode(hdr); 5321 } 5322 return 0; 5323 } 5324 5325 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5326 struct nfs_pgio_args *args) 5327 { 5328 5329 if (!nfs4_error_stateid_expired(task->tk_status) || 5330 nfs4_stateid_is_current(&args->stateid, 5331 args->context, 5332 args->lock_context, 5333 FMODE_WRITE)) 5334 return false; 5335 rpc_restart_call_prepare(task); 5336 return true; 5337 } 5338 5339 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5340 { 5341 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5342 return -EAGAIN; 5343 if (nfs4_write_stateid_changed(task, &hdr->args)) 5344 return -EAGAIN; 5345 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5346 nfs4_write_done_cb(task, hdr); 5347 } 5348 5349 static 5350 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5351 { 5352 /* Don't request attributes for pNFS or O_DIRECT writes */ 5353 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5354 return false; 5355 /* Otherwise, request attributes if and only if we don't hold 5356 * a delegation 5357 */ 5358 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5359 } 5360 5361 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5362 struct rpc_message *msg, 5363 struct rpc_clnt **clnt) 5364 { 5365 struct nfs_server *server = NFS_SERVER(hdr->inode); 5366 5367 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5368 hdr->args.bitmask = NULL; 5369 hdr->res.fattr = NULL; 5370 } else 5371 hdr->args.bitmask = server->cache_consistency_bitmask; 5372 5373 if (!hdr->pgio_done_cb) 5374 hdr->pgio_done_cb = nfs4_write_done_cb; 5375 hdr->res.server = server; 5376 hdr->timestamp = jiffies; 5377 5378 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5379 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5380 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5381 } 5382 5383 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5384 { 5385 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5386 &data->args.seq_args, 5387 &data->res.seq_res, 5388 task); 5389 } 5390 5391 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5392 { 5393 struct inode *inode = data->inode; 5394 5395 trace_nfs4_commit(data, task->tk_status); 5396 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5397 NULL, NULL) == -EAGAIN) { 5398 rpc_restart_call_prepare(task); 5399 return -EAGAIN; 5400 } 5401 return 0; 5402 } 5403 5404 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5405 { 5406 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5407 return -EAGAIN; 5408 return data->commit_done_cb(task, data); 5409 } 5410 5411 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5412 struct rpc_clnt **clnt) 5413 { 5414 struct nfs_server *server = NFS_SERVER(data->inode); 5415 5416 if (data->commit_done_cb == NULL) 5417 data->commit_done_cb = nfs4_commit_done_cb; 5418 data->res.server = server; 5419 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5420 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5421 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5422 } 5423 5424 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5425 struct nfs_commitres *res) 5426 { 5427 struct inode *dst_inode = file_inode(dst); 5428 struct nfs_server *server = NFS_SERVER(dst_inode); 5429 struct rpc_message msg = { 5430 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5431 .rpc_argp = args, 5432 .rpc_resp = res, 5433 }; 5434 5435 args->fh = NFS_FH(dst_inode); 5436 return nfs4_call_sync(server->client, server, &msg, 5437 &args->seq_args, &res->seq_res, 1); 5438 } 5439 5440 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5441 { 5442 struct nfs_commitargs args = { 5443 .offset = offset, 5444 .count = count, 5445 }; 5446 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5447 struct nfs4_exception exception = { }; 5448 int status; 5449 5450 do { 5451 status = _nfs4_proc_commit(dst, &args, res); 5452 status = nfs4_handle_exception(dst_server, status, &exception); 5453 } while (exception.retry); 5454 5455 return status; 5456 } 5457 5458 struct nfs4_renewdata { 5459 struct nfs_client *client; 5460 unsigned long timestamp; 5461 }; 5462 5463 /* 5464 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5465 * standalone procedure for queueing an asynchronous RENEW. 5466 */ 5467 static void nfs4_renew_release(void *calldata) 5468 { 5469 struct nfs4_renewdata *data = calldata; 5470 struct nfs_client *clp = data->client; 5471 5472 if (refcount_read(&clp->cl_count) > 1) 5473 nfs4_schedule_state_renewal(clp); 5474 nfs_put_client(clp); 5475 kfree(data); 5476 } 5477 5478 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5479 { 5480 struct nfs4_renewdata *data = calldata; 5481 struct nfs_client *clp = data->client; 5482 unsigned long timestamp = data->timestamp; 5483 5484 trace_nfs4_renew_async(clp, task->tk_status); 5485 switch (task->tk_status) { 5486 case 0: 5487 break; 5488 case -NFS4ERR_LEASE_MOVED: 5489 nfs4_schedule_lease_moved_recovery(clp); 5490 break; 5491 default: 5492 /* Unless we're shutting down, schedule state recovery! */ 5493 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5494 return; 5495 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5496 nfs4_schedule_lease_recovery(clp); 5497 return; 5498 } 5499 nfs4_schedule_path_down_recovery(clp); 5500 } 5501 do_renew_lease(clp, timestamp); 5502 } 5503 5504 static const struct rpc_call_ops nfs4_renew_ops = { 5505 .rpc_call_done = nfs4_renew_done, 5506 .rpc_release = nfs4_renew_release, 5507 }; 5508 5509 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5510 { 5511 struct rpc_message msg = { 5512 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5513 .rpc_argp = clp, 5514 .rpc_cred = cred, 5515 }; 5516 struct nfs4_renewdata *data; 5517 5518 if (renew_flags == 0) 5519 return 0; 5520 if (!refcount_inc_not_zero(&clp->cl_count)) 5521 return -EIO; 5522 data = kmalloc(sizeof(*data), GFP_NOFS); 5523 if (data == NULL) { 5524 nfs_put_client(clp); 5525 return -ENOMEM; 5526 } 5527 data->client = clp; 5528 data->timestamp = jiffies; 5529 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5530 &nfs4_renew_ops, data); 5531 } 5532 5533 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5534 { 5535 struct rpc_message msg = { 5536 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5537 .rpc_argp = clp, 5538 .rpc_cred = cred, 5539 }; 5540 unsigned long now = jiffies; 5541 int status; 5542 5543 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5544 if (status < 0) 5545 return status; 5546 do_renew_lease(clp, now); 5547 return 0; 5548 } 5549 5550 static inline int nfs4_server_supports_acls(struct nfs_server *server) 5551 { 5552 return server->caps & NFS_CAP_ACLS; 5553 } 5554 5555 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5556 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5557 * the stack. 5558 */ 5559 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5560 5561 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5562 struct page **pages) 5563 { 5564 struct page *newpage, **spages; 5565 int rc = 0; 5566 size_t len; 5567 spages = pages; 5568 5569 do { 5570 len = min_t(size_t, PAGE_SIZE, buflen); 5571 newpage = alloc_page(GFP_KERNEL); 5572 5573 if (newpage == NULL) 5574 goto unwind; 5575 memcpy(page_address(newpage), buf, len); 5576 buf += len; 5577 buflen -= len; 5578 *pages++ = newpage; 5579 rc++; 5580 } while (buflen != 0); 5581 5582 return rc; 5583 5584 unwind: 5585 for(; rc > 0; rc--) 5586 __free_page(spages[rc-1]); 5587 return -ENOMEM; 5588 } 5589 5590 struct nfs4_cached_acl { 5591 int cached; 5592 size_t len; 5593 char data[]; 5594 }; 5595 5596 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5597 { 5598 struct nfs_inode *nfsi = NFS_I(inode); 5599 5600 spin_lock(&inode->i_lock); 5601 kfree(nfsi->nfs4_acl); 5602 nfsi->nfs4_acl = acl; 5603 spin_unlock(&inode->i_lock); 5604 } 5605 5606 static void nfs4_zap_acl_attr(struct inode *inode) 5607 { 5608 nfs4_set_cached_acl(inode, NULL); 5609 } 5610 5611 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 5612 { 5613 struct nfs_inode *nfsi = NFS_I(inode); 5614 struct nfs4_cached_acl *acl; 5615 int ret = -ENOENT; 5616 5617 spin_lock(&inode->i_lock); 5618 acl = nfsi->nfs4_acl; 5619 if (acl == NULL) 5620 goto out; 5621 if (buf == NULL) /* user is just asking for length */ 5622 goto out_len; 5623 if (acl->cached == 0) 5624 goto out; 5625 ret = -ERANGE; /* see getxattr(2) man page */ 5626 if (acl->len > buflen) 5627 goto out; 5628 memcpy(buf, acl->data, acl->len); 5629 out_len: 5630 ret = acl->len; 5631 out: 5632 spin_unlock(&inode->i_lock); 5633 return ret; 5634 } 5635 5636 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 5637 { 5638 struct nfs4_cached_acl *acl; 5639 size_t buflen = sizeof(*acl) + acl_len; 5640 5641 if (buflen <= PAGE_SIZE) { 5642 acl = kmalloc(buflen, GFP_KERNEL); 5643 if (acl == NULL) 5644 goto out; 5645 acl->cached = 1; 5646 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5647 } else { 5648 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5649 if (acl == NULL) 5650 goto out; 5651 acl->cached = 0; 5652 } 5653 acl->len = acl_len; 5654 out: 5655 nfs4_set_cached_acl(inode, acl); 5656 } 5657 5658 /* 5659 * The getxattr API returns the required buffer length when called with a 5660 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5661 * the required buf. On a NULL buf, we send a page of data to the server 5662 * guessing that the ACL request can be serviced by a page. If so, we cache 5663 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5664 * the cache. If not so, we throw away the page, and cache the required 5665 * length. The next getxattr call will then produce another round trip to 5666 * the server, this time with the input buf of the required size. 5667 */ 5668 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5669 { 5670 struct page **pages; 5671 struct nfs_getaclargs args = { 5672 .fh = NFS_FH(inode), 5673 .acl_len = buflen, 5674 }; 5675 struct nfs_getaclres res = { 5676 .acl_len = buflen, 5677 }; 5678 struct rpc_message msg = { 5679 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5680 .rpc_argp = &args, 5681 .rpc_resp = &res, 5682 }; 5683 unsigned int npages; 5684 int ret = -ENOMEM, i; 5685 struct nfs_server *server = NFS_SERVER(inode); 5686 5687 if (buflen == 0) 5688 buflen = server->rsize; 5689 5690 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5691 pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS); 5692 if (!pages) 5693 return -ENOMEM; 5694 5695 args.acl_pages = pages; 5696 5697 for (i = 0; i < npages; i++) { 5698 pages[i] = alloc_page(GFP_KERNEL); 5699 if (!pages[i]) 5700 goto out_free; 5701 } 5702 5703 /* for decoding across pages */ 5704 res.acl_scratch = alloc_page(GFP_KERNEL); 5705 if (!res.acl_scratch) 5706 goto out_free; 5707 5708 args.acl_len = npages * PAGE_SIZE; 5709 5710 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5711 __func__, buf, buflen, npages, args.acl_len); 5712 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5713 &msg, &args.seq_args, &res.seq_res, 0); 5714 if (ret) 5715 goto out_free; 5716 5717 /* Handle the case where the passed-in buffer is too short */ 5718 if (res.acl_flags & NFS4_ACL_TRUNC) { 5719 /* Did the user only issue a request for the acl length? */ 5720 if (buf == NULL) 5721 goto out_ok; 5722 ret = -ERANGE; 5723 goto out_free; 5724 } 5725 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 5726 if (buf) { 5727 if (res.acl_len > buflen) { 5728 ret = -ERANGE; 5729 goto out_free; 5730 } 5731 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5732 } 5733 out_ok: 5734 ret = res.acl_len; 5735 out_free: 5736 for (i = 0; i < npages; i++) 5737 if (pages[i]) 5738 __free_page(pages[i]); 5739 if (res.acl_scratch) 5740 __free_page(res.acl_scratch); 5741 kfree(pages); 5742 return ret; 5743 } 5744 5745 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5746 { 5747 struct nfs4_exception exception = { 5748 .interruptible = true, 5749 }; 5750 ssize_t ret; 5751 do { 5752 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 5753 trace_nfs4_get_acl(inode, ret); 5754 if (ret >= 0) 5755 break; 5756 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 5757 } while (exception.retry); 5758 return ret; 5759 } 5760 5761 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 5762 { 5763 struct nfs_server *server = NFS_SERVER(inode); 5764 int ret; 5765 5766 if (!nfs4_server_supports_acls(server)) 5767 return -EOPNOTSUPP; 5768 ret = nfs_revalidate_inode(server, inode); 5769 if (ret < 0) 5770 return ret; 5771 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 5772 nfs_zap_acl_cache(inode); 5773 ret = nfs4_read_cached_acl(inode, buf, buflen); 5774 if (ret != -ENOENT) 5775 /* -ENOENT is returned if there is no ACL or if there is an ACL 5776 * but no cached acl data, just the acl length */ 5777 return ret; 5778 return nfs4_get_acl_uncached(inode, buf, buflen); 5779 } 5780 5781 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5782 { 5783 struct nfs_server *server = NFS_SERVER(inode); 5784 struct page *pages[NFS4ACL_MAXPAGES]; 5785 struct nfs_setaclargs arg = { 5786 .fh = NFS_FH(inode), 5787 .acl_pages = pages, 5788 .acl_len = buflen, 5789 }; 5790 struct nfs_setaclres res; 5791 struct rpc_message msg = { 5792 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 5793 .rpc_argp = &arg, 5794 .rpc_resp = &res, 5795 }; 5796 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 5797 int ret, i; 5798 5799 if (!nfs4_server_supports_acls(server)) 5800 return -EOPNOTSUPP; 5801 if (npages > ARRAY_SIZE(pages)) 5802 return -ERANGE; 5803 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 5804 if (i < 0) 5805 return i; 5806 nfs4_inode_make_writeable(inode); 5807 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5808 5809 /* 5810 * Free each page after tx, so the only ref left is 5811 * held by the network stack 5812 */ 5813 for (; i > 0; i--) 5814 put_page(pages[i-1]); 5815 5816 /* 5817 * Acl update can result in inode attribute update. 5818 * so mark the attribute cache invalid. 5819 */ 5820 spin_lock(&inode->i_lock); 5821 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 5822 | NFS_INO_INVALID_CTIME 5823 | NFS_INO_REVAL_FORCED; 5824 spin_unlock(&inode->i_lock); 5825 nfs_access_zap_cache(inode); 5826 nfs_zap_acl_cache(inode); 5827 return ret; 5828 } 5829 5830 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5831 { 5832 struct nfs4_exception exception = { }; 5833 int err; 5834 do { 5835 err = __nfs4_proc_set_acl(inode, buf, buflen); 5836 trace_nfs4_set_acl(inode, err); 5837 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5838 &exception); 5839 } while (exception.retry); 5840 return err; 5841 } 5842 5843 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5844 static int _nfs4_get_security_label(struct inode *inode, void *buf, 5845 size_t buflen) 5846 { 5847 struct nfs_server *server = NFS_SERVER(inode); 5848 struct nfs_fattr fattr; 5849 struct nfs4_label label = {0, 0, buflen, buf}; 5850 5851 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5852 struct nfs4_getattr_arg arg = { 5853 .fh = NFS_FH(inode), 5854 .bitmask = bitmask, 5855 }; 5856 struct nfs4_getattr_res res = { 5857 .fattr = &fattr, 5858 .label = &label, 5859 .server = server, 5860 }; 5861 struct rpc_message msg = { 5862 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 5863 .rpc_argp = &arg, 5864 .rpc_resp = &res, 5865 }; 5866 int ret; 5867 5868 nfs_fattr_init(&fattr); 5869 5870 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 5871 if (ret) 5872 return ret; 5873 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 5874 return -ENOENT; 5875 return 0; 5876 } 5877 5878 static int nfs4_get_security_label(struct inode *inode, void *buf, 5879 size_t buflen) 5880 { 5881 struct nfs4_exception exception = { 5882 .interruptible = true, 5883 }; 5884 int err; 5885 5886 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5887 return -EOPNOTSUPP; 5888 5889 do { 5890 err = _nfs4_get_security_label(inode, buf, buflen); 5891 trace_nfs4_get_security_label(inode, err); 5892 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5893 &exception); 5894 } while (exception.retry); 5895 return err; 5896 } 5897 5898 static int _nfs4_do_set_security_label(struct inode *inode, 5899 struct nfs4_label *ilabel, 5900 struct nfs_fattr *fattr, 5901 struct nfs4_label *olabel) 5902 { 5903 5904 struct iattr sattr = {0}; 5905 struct nfs_server *server = NFS_SERVER(inode); 5906 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5907 struct nfs_setattrargs arg = { 5908 .fh = NFS_FH(inode), 5909 .iap = &sattr, 5910 .server = server, 5911 .bitmask = bitmask, 5912 .label = ilabel, 5913 }; 5914 struct nfs_setattrres res = { 5915 .fattr = fattr, 5916 .label = olabel, 5917 .server = server, 5918 }; 5919 struct rpc_message msg = { 5920 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 5921 .rpc_argp = &arg, 5922 .rpc_resp = &res, 5923 }; 5924 int status; 5925 5926 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 5927 5928 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5929 if (status) 5930 dprintk("%s failed: %d\n", __func__, status); 5931 5932 return status; 5933 } 5934 5935 static int nfs4_do_set_security_label(struct inode *inode, 5936 struct nfs4_label *ilabel, 5937 struct nfs_fattr *fattr, 5938 struct nfs4_label *olabel) 5939 { 5940 struct nfs4_exception exception = { }; 5941 int err; 5942 5943 do { 5944 err = _nfs4_do_set_security_label(inode, ilabel, 5945 fattr, olabel); 5946 trace_nfs4_set_security_label(inode, err); 5947 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5948 &exception); 5949 } while (exception.retry); 5950 return err; 5951 } 5952 5953 static int 5954 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 5955 { 5956 struct nfs4_label ilabel, *olabel = NULL; 5957 struct nfs_fattr fattr; 5958 int status; 5959 5960 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5961 return -EOPNOTSUPP; 5962 5963 nfs_fattr_init(&fattr); 5964 5965 ilabel.pi = 0; 5966 ilabel.lfs = 0; 5967 ilabel.label = (char *)buf; 5968 ilabel.len = buflen; 5969 5970 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5971 if (IS_ERR(olabel)) { 5972 status = -PTR_ERR(olabel); 5973 goto out; 5974 } 5975 5976 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5977 if (status == 0) 5978 nfs_setsecurity(inode, &fattr, olabel); 5979 5980 nfs4_label_free(olabel); 5981 out: 5982 return status; 5983 } 5984 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5985 5986 5987 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5988 nfs4_verifier *bootverf) 5989 { 5990 __be32 verf[2]; 5991 5992 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5993 /* An impossible timestamp guarantees this value 5994 * will never match a generated boot time. */ 5995 verf[0] = cpu_to_be32(U32_MAX); 5996 verf[1] = cpu_to_be32(U32_MAX); 5997 } else { 5998 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5999 u64 ns = ktime_to_ns(nn->boot_time); 6000 6001 verf[0] = cpu_to_be32(ns >> 32); 6002 verf[1] = cpu_to_be32(ns); 6003 } 6004 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6005 } 6006 6007 static int 6008 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6009 { 6010 size_t len; 6011 char *str; 6012 6013 if (clp->cl_owner_id != NULL) 6014 return 0; 6015 6016 rcu_read_lock(); 6017 len = 14 + 6018 strlen(clp->cl_rpcclient->cl_nodename) + 6019 1 + 6020 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6021 1; 6022 rcu_read_unlock(); 6023 if (nfs4_client_id_uniquifier[0] != '\0') 6024 len += strlen(nfs4_client_id_uniquifier) + 1; 6025 if (len > NFS4_OPAQUE_LIMIT + 1) 6026 return -EINVAL; 6027 6028 /* 6029 * Since this string is allocated at mount time, and held until the 6030 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6031 * about a memory-reclaim deadlock. 6032 */ 6033 str = kmalloc(len, GFP_KERNEL); 6034 if (!str) 6035 return -ENOMEM; 6036 6037 rcu_read_lock(); 6038 if (nfs4_client_id_uniquifier[0] != '\0') 6039 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6040 clp->cl_rpcclient->cl_nodename, 6041 nfs4_client_id_uniquifier, 6042 rpc_peeraddr2str(clp->cl_rpcclient, 6043 RPC_DISPLAY_ADDR)); 6044 else 6045 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6046 clp->cl_rpcclient->cl_nodename, 6047 rpc_peeraddr2str(clp->cl_rpcclient, 6048 RPC_DISPLAY_ADDR)); 6049 rcu_read_unlock(); 6050 6051 clp->cl_owner_id = str; 6052 return 0; 6053 } 6054 6055 static int 6056 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 6057 { 6058 size_t len; 6059 char *str; 6060 6061 len = 10 + 10 + 1 + 10 + 1 + 6062 strlen(nfs4_client_id_uniquifier) + 1 + 6063 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6064 6065 if (len > NFS4_OPAQUE_LIMIT + 1) 6066 return -EINVAL; 6067 6068 /* 6069 * Since this string is allocated at mount time, and held until the 6070 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6071 * about a memory-reclaim deadlock. 6072 */ 6073 str = kmalloc(len, GFP_KERNEL); 6074 if (!str) 6075 return -ENOMEM; 6076 6077 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6078 clp->rpc_ops->version, clp->cl_minorversion, 6079 nfs4_client_id_uniquifier, 6080 clp->cl_rpcclient->cl_nodename); 6081 clp->cl_owner_id = str; 6082 return 0; 6083 } 6084 6085 static int 6086 nfs4_init_uniform_client_string(struct nfs_client *clp) 6087 { 6088 size_t len; 6089 char *str; 6090 6091 if (clp->cl_owner_id != NULL) 6092 return 0; 6093 6094 if (nfs4_client_id_uniquifier[0] != '\0') 6095 return nfs4_init_uniquifier_client_string(clp); 6096 6097 len = 10 + 10 + 1 + 10 + 1 + 6098 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6099 6100 if (len > NFS4_OPAQUE_LIMIT + 1) 6101 return -EINVAL; 6102 6103 /* 6104 * Since this string is allocated at mount time, and held until the 6105 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6106 * about a memory-reclaim deadlock. 6107 */ 6108 str = kmalloc(len, GFP_KERNEL); 6109 if (!str) 6110 return -ENOMEM; 6111 6112 scnprintf(str, len, "Linux NFSv%u.%u %s", 6113 clp->rpc_ops->version, clp->cl_minorversion, 6114 clp->cl_rpcclient->cl_nodename); 6115 clp->cl_owner_id = str; 6116 return 0; 6117 } 6118 6119 /* 6120 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6121 * services. Advertise one based on the address family of the 6122 * clientaddr. 6123 */ 6124 static unsigned int 6125 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6126 { 6127 if (strchr(clp->cl_ipaddr, ':') != NULL) 6128 return scnprintf(buf, len, "tcp6"); 6129 else 6130 return scnprintf(buf, len, "tcp"); 6131 } 6132 6133 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6134 { 6135 struct nfs4_setclientid *sc = calldata; 6136 6137 if (task->tk_status == 0) 6138 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6139 } 6140 6141 static const struct rpc_call_ops nfs4_setclientid_ops = { 6142 .rpc_call_done = nfs4_setclientid_done, 6143 }; 6144 6145 /** 6146 * nfs4_proc_setclientid - Negotiate client ID 6147 * @clp: state data structure 6148 * @program: RPC program for NFSv4 callback service 6149 * @port: IP port number for NFS4 callback service 6150 * @cred: credential to use for this call 6151 * @res: where to place the result 6152 * 6153 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6154 */ 6155 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6156 unsigned short port, const struct cred *cred, 6157 struct nfs4_setclientid_res *res) 6158 { 6159 nfs4_verifier sc_verifier; 6160 struct nfs4_setclientid setclientid = { 6161 .sc_verifier = &sc_verifier, 6162 .sc_prog = program, 6163 .sc_clnt = clp, 6164 }; 6165 struct rpc_message msg = { 6166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6167 .rpc_argp = &setclientid, 6168 .rpc_resp = res, 6169 .rpc_cred = cred, 6170 }; 6171 struct rpc_task_setup task_setup_data = { 6172 .rpc_client = clp->cl_rpcclient, 6173 .rpc_message = &msg, 6174 .callback_ops = &nfs4_setclientid_ops, 6175 .callback_data = &setclientid, 6176 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6177 }; 6178 unsigned long now = jiffies; 6179 int status; 6180 6181 /* nfs_client_id4 */ 6182 nfs4_init_boot_verifier(clp, &sc_verifier); 6183 6184 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6185 status = nfs4_init_uniform_client_string(clp); 6186 else 6187 status = nfs4_init_nonuniform_client_string(clp); 6188 6189 if (status) 6190 goto out; 6191 6192 /* cb_client4 */ 6193 setclientid.sc_netid_len = 6194 nfs4_init_callback_netid(clp, 6195 setclientid.sc_netid, 6196 sizeof(setclientid.sc_netid)); 6197 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6198 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6199 clp->cl_ipaddr, port >> 8, port & 255); 6200 6201 dprintk("NFS call setclientid auth=%s, '%s'\n", 6202 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6203 clp->cl_owner_id); 6204 6205 status = nfs4_call_sync_custom(&task_setup_data); 6206 if (setclientid.sc_cred) { 6207 kfree(clp->cl_acceptor); 6208 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6209 put_rpccred(setclientid.sc_cred); 6210 } 6211 6212 if (status == 0) 6213 do_renew_lease(clp, now); 6214 out: 6215 trace_nfs4_setclientid(clp, status); 6216 dprintk("NFS reply setclientid: %d\n", status); 6217 return status; 6218 } 6219 6220 /** 6221 * nfs4_proc_setclientid_confirm - Confirm client ID 6222 * @clp: state data structure 6223 * @arg: result of a previous SETCLIENTID 6224 * @cred: credential to use for this call 6225 * 6226 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6227 */ 6228 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6229 struct nfs4_setclientid_res *arg, 6230 const struct cred *cred) 6231 { 6232 struct rpc_message msg = { 6233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6234 .rpc_argp = arg, 6235 .rpc_cred = cred, 6236 }; 6237 int status; 6238 6239 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6240 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6241 clp->cl_clientid); 6242 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6243 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6244 trace_nfs4_setclientid_confirm(clp, status); 6245 dprintk("NFS reply setclientid_confirm: %d\n", status); 6246 return status; 6247 } 6248 6249 struct nfs4_delegreturndata { 6250 struct nfs4_delegreturnargs args; 6251 struct nfs4_delegreturnres res; 6252 struct nfs_fh fh; 6253 nfs4_stateid stateid; 6254 unsigned long timestamp; 6255 struct { 6256 struct nfs4_layoutreturn_args arg; 6257 struct nfs4_layoutreturn_res res; 6258 struct nfs4_xdr_opaque_data ld_private; 6259 u32 roc_barrier; 6260 bool roc; 6261 } lr; 6262 struct nfs_fattr fattr; 6263 int rpc_status; 6264 struct inode *inode; 6265 }; 6266 6267 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6268 { 6269 struct nfs4_delegreturndata *data = calldata; 6270 struct nfs4_exception exception = { 6271 .inode = data->inode, 6272 .stateid = &data->stateid, 6273 }; 6274 6275 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6276 return; 6277 6278 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6279 6280 /* Handle Layoutreturn errors */ 6281 if (pnfs_roc_done(task, data->inode, 6282 &data->args.lr_args, 6283 &data->res.lr_res, 6284 &data->res.lr_ret) == -EAGAIN) 6285 goto out_restart; 6286 6287 switch (task->tk_status) { 6288 case 0: 6289 renew_lease(data->res.server, data->timestamp); 6290 break; 6291 case -NFS4ERR_ADMIN_REVOKED: 6292 case -NFS4ERR_DELEG_REVOKED: 6293 case -NFS4ERR_EXPIRED: 6294 nfs4_free_revoked_stateid(data->res.server, 6295 data->args.stateid, 6296 task->tk_msg.rpc_cred); 6297 /* Fallthrough */ 6298 case -NFS4ERR_BAD_STATEID: 6299 case -NFS4ERR_STALE_STATEID: 6300 case -ETIMEDOUT: 6301 task->tk_status = 0; 6302 break; 6303 case -NFS4ERR_OLD_STATEID: 6304 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6305 nfs4_stateid_seqid_inc(&data->stateid); 6306 if (data->args.bitmask) { 6307 data->args.bitmask = NULL; 6308 data->res.fattr = NULL; 6309 } 6310 goto out_restart; 6311 case -NFS4ERR_ACCESS: 6312 if (data->args.bitmask) { 6313 data->args.bitmask = NULL; 6314 data->res.fattr = NULL; 6315 goto out_restart; 6316 } 6317 /* Fallthrough */ 6318 default: 6319 task->tk_status = nfs4_async_handle_exception(task, 6320 data->res.server, task->tk_status, 6321 &exception); 6322 if (exception.retry) 6323 goto out_restart; 6324 } 6325 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6326 data->rpc_status = task->tk_status; 6327 return; 6328 out_restart: 6329 task->tk_status = 0; 6330 rpc_restart_call_prepare(task); 6331 } 6332 6333 static void nfs4_delegreturn_release(void *calldata) 6334 { 6335 struct nfs4_delegreturndata *data = calldata; 6336 struct inode *inode = data->inode; 6337 6338 if (inode) { 6339 if (data->lr.roc) 6340 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6341 data->res.lr_ret); 6342 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 6343 nfs_iput_and_deactive(inode); 6344 } 6345 kfree(calldata); 6346 } 6347 6348 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6349 { 6350 struct nfs4_delegreturndata *d_data; 6351 struct pnfs_layout_hdr *lo; 6352 6353 d_data = (struct nfs4_delegreturndata *)data; 6354 6355 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6356 nfs4_sequence_done(task, &d_data->res.seq_res); 6357 return; 6358 } 6359 6360 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6361 if (lo && !pnfs_layout_is_valid(lo)) { 6362 d_data->args.lr_args = NULL; 6363 d_data->res.lr_res = NULL; 6364 } 6365 6366 nfs4_setup_sequence(d_data->res.server->nfs_client, 6367 &d_data->args.seq_args, 6368 &d_data->res.seq_res, 6369 task); 6370 } 6371 6372 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6373 .rpc_call_prepare = nfs4_delegreturn_prepare, 6374 .rpc_call_done = nfs4_delegreturn_done, 6375 .rpc_release = nfs4_delegreturn_release, 6376 }; 6377 6378 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6379 { 6380 struct nfs4_delegreturndata *data; 6381 struct nfs_server *server = NFS_SERVER(inode); 6382 struct rpc_task *task; 6383 struct rpc_message msg = { 6384 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6385 .rpc_cred = cred, 6386 }; 6387 struct rpc_task_setup task_setup_data = { 6388 .rpc_client = server->client, 6389 .rpc_message = &msg, 6390 .callback_ops = &nfs4_delegreturn_ops, 6391 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6392 }; 6393 int status = 0; 6394 6395 data = kzalloc(sizeof(*data), GFP_NOFS); 6396 if (data == NULL) 6397 return -ENOMEM; 6398 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 6399 6400 nfs4_state_protect(server->nfs_client, 6401 NFS_SP4_MACH_CRED_CLEANUP, 6402 &task_setup_data.rpc_client, &msg); 6403 6404 data->args.fhandle = &data->fh; 6405 data->args.stateid = &data->stateid; 6406 data->args.bitmask = server->cache_consistency_bitmask; 6407 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6408 nfs4_stateid_copy(&data->stateid, stateid); 6409 data->res.fattr = &data->fattr; 6410 data->res.server = server; 6411 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6412 data->lr.arg.ld_private = &data->lr.ld_private; 6413 nfs_fattr_init(data->res.fattr); 6414 data->timestamp = jiffies; 6415 data->rpc_status = 0; 6416 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred); 6417 data->inode = nfs_igrab_and_active(inode); 6418 if (data->inode) { 6419 if (data->lr.roc) { 6420 data->args.lr_args = &data->lr.arg; 6421 data->res.lr_res = &data->lr.res; 6422 } 6423 } else if (data->lr.roc) { 6424 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0); 6425 data->lr.roc = false; 6426 } 6427 6428 task_setup_data.callback_data = data; 6429 msg.rpc_argp = &data->args; 6430 msg.rpc_resp = &data->res; 6431 task = rpc_run_task(&task_setup_data); 6432 if (IS_ERR(task)) 6433 return PTR_ERR(task); 6434 if (!issync) 6435 goto out; 6436 status = rpc_wait_for_completion_task(task); 6437 if (status != 0) 6438 goto out; 6439 status = data->rpc_status; 6440 out: 6441 rpc_put_task(task); 6442 return status; 6443 } 6444 6445 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6446 { 6447 struct nfs_server *server = NFS_SERVER(inode); 6448 struct nfs4_exception exception = { }; 6449 int err; 6450 do { 6451 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6452 trace_nfs4_delegreturn(inode, stateid, err); 6453 switch (err) { 6454 case -NFS4ERR_STALE_STATEID: 6455 case -NFS4ERR_EXPIRED: 6456 case 0: 6457 return 0; 6458 } 6459 err = nfs4_handle_exception(server, err, &exception); 6460 } while (exception.retry); 6461 return err; 6462 } 6463 6464 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6465 { 6466 struct inode *inode = state->inode; 6467 struct nfs_server *server = NFS_SERVER(inode); 6468 struct nfs_client *clp = server->nfs_client; 6469 struct nfs_lockt_args arg = { 6470 .fh = NFS_FH(inode), 6471 .fl = request, 6472 }; 6473 struct nfs_lockt_res res = { 6474 .denied = request, 6475 }; 6476 struct rpc_message msg = { 6477 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6478 .rpc_argp = &arg, 6479 .rpc_resp = &res, 6480 .rpc_cred = state->owner->so_cred, 6481 }; 6482 struct nfs4_lock_state *lsp; 6483 int status; 6484 6485 arg.lock_owner.clientid = clp->cl_clientid; 6486 status = nfs4_set_lock_state(state, request); 6487 if (status != 0) 6488 goto out; 6489 lsp = request->fl_u.nfs4_fl.owner; 6490 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6491 arg.lock_owner.s_dev = server->s_dev; 6492 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6493 switch (status) { 6494 case 0: 6495 request->fl_type = F_UNLCK; 6496 break; 6497 case -NFS4ERR_DENIED: 6498 status = 0; 6499 } 6500 request->fl_ops->fl_release_private(request); 6501 request->fl_ops = NULL; 6502 out: 6503 return status; 6504 } 6505 6506 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6507 { 6508 struct nfs4_exception exception = { 6509 .interruptible = true, 6510 }; 6511 int err; 6512 6513 do { 6514 err = _nfs4_proc_getlk(state, cmd, request); 6515 trace_nfs4_get_lock(request, state, cmd, err); 6516 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6517 &exception); 6518 } while (exception.retry); 6519 return err; 6520 } 6521 6522 /* 6523 * Update the seqid of a lock stateid after receiving 6524 * NFS4ERR_OLD_STATEID 6525 */ 6526 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6527 struct nfs4_lock_state *lsp) 6528 { 6529 struct nfs4_state *state = lsp->ls_state; 6530 bool ret = false; 6531 6532 spin_lock(&state->state_lock); 6533 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6534 goto out; 6535 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6536 nfs4_stateid_seqid_inc(dst); 6537 else 6538 dst->seqid = lsp->ls_stateid.seqid; 6539 ret = true; 6540 out: 6541 spin_unlock(&state->state_lock); 6542 return ret; 6543 } 6544 6545 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6546 struct nfs4_lock_state *lsp) 6547 { 6548 struct nfs4_state *state = lsp->ls_state; 6549 bool ret; 6550 6551 spin_lock(&state->state_lock); 6552 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6553 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6554 spin_unlock(&state->state_lock); 6555 return ret; 6556 } 6557 6558 struct nfs4_unlockdata { 6559 struct nfs_locku_args arg; 6560 struct nfs_locku_res res; 6561 struct nfs4_lock_state *lsp; 6562 struct nfs_open_context *ctx; 6563 struct nfs_lock_context *l_ctx; 6564 struct file_lock fl; 6565 struct nfs_server *server; 6566 unsigned long timestamp; 6567 }; 6568 6569 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6570 struct nfs_open_context *ctx, 6571 struct nfs4_lock_state *lsp, 6572 struct nfs_seqid *seqid) 6573 { 6574 struct nfs4_unlockdata *p; 6575 struct nfs4_state *state = lsp->ls_state; 6576 struct inode *inode = state->inode; 6577 6578 p = kzalloc(sizeof(*p), GFP_NOFS); 6579 if (p == NULL) 6580 return NULL; 6581 p->arg.fh = NFS_FH(inode); 6582 p->arg.fl = &p->fl; 6583 p->arg.seqid = seqid; 6584 p->res.seqid = seqid; 6585 p->lsp = lsp; 6586 /* Ensure we don't close file until we're done freeing locks! */ 6587 p->ctx = get_nfs_open_context(ctx); 6588 p->l_ctx = nfs_get_lock_context(ctx); 6589 locks_init_lock(&p->fl); 6590 locks_copy_lock(&p->fl, fl); 6591 p->server = NFS_SERVER(inode); 6592 spin_lock(&state->state_lock); 6593 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6594 spin_unlock(&state->state_lock); 6595 return p; 6596 } 6597 6598 static void nfs4_locku_release_calldata(void *data) 6599 { 6600 struct nfs4_unlockdata *calldata = data; 6601 nfs_free_seqid(calldata->arg.seqid); 6602 nfs4_put_lock_state(calldata->lsp); 6603 nfs_put_lock_context(calldata->l_ctx); 6604 put_nfs_open_context(calldata->ctx); 6605 kfree(calldata); 6606 } 6607 6608 static void nfs4_locku_done(struct rpc_task *task, void *data) 6609 { 6610 struct nfs4_unlockdata *calldata = data; 6611 struct nfs4_exception exception = { 6612 .inode = calldata->lsp->ls_state->inode, 6613 .stateid = &calldata->arg.stateid, 6614 }; 6615 6616 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6617 return; 6618 switch (task->tk_status) { 6619 case 0: 6620 renew_lease(calldata->server, calldata->timestamp); 6621 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6622 if (nfs4_update_lock_stateid(calldata->lsp, 6623 &calldata->res.stateid)) 6624 break; 6625 /* Fall through */ 6626 case -NFS4ERR_ADMIN_REVOKED: 6627 case -NFS4ERR_EXPIRED: 6628 nfs4_free_revoked_stateid(calldata->server, 6629 &calldata->arg.stateid, 6630 task->tk_msg.rpc_cred); 6631 /* Fall through */ 6632 case -NFS4ERR_BAD_STATEID: 6633 case -NFS4ERR_STALE_STATEID: 6634 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6635 calldata->lsp)) 6636 rpc_restart_call_prepare(task); 6637 break; 6638 case -NFS4ERR_OLD_STATEID: 6639 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6640 calldata->lsp)) 6641 rpc_restart_call_prepare(task); 6642 break; 6643 default: 6644 task->tk_status = nfs4_async_handle_exception(task, 6645 calldata->server, task->tk_status, 6646 &exception); 6647 if (exception.retry) 6648 rpc_restart_call_prepare(task); 6649 } 6650 nfs_release_seqid(calldata->arg.seqid); 6651 } 6652 6653 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6654 { 6655 struct nfs4_unlockdata *calldata = data; 6656 6657 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6658 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6659 return; 6660 6661 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6662 goto out_wait; 6663 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6664 /* Note: exit _without_ running nfs4_locku_done */ 6665 goto out_no_action; 6666 } 6667 calldata->timestamp = jiffies; 6668 if (nfs4_setup_sequence(calldata->server->nfs_client, 6669 &calldata->arg.seq_args, 6670 &calldata->res.seq_res, 6671 task) != 0) 6672 nfs_release_seqid(calldata->arg.seqid); 6673 return; 6674 out_no_action: 6675 task->tk_action = NULL; 6676 out_wait: 6677 nfs4_sequence_done(task, &calldata->res.seq_res); 6678 } 6679 6680 static const struct rpc_call_ops nfs4_locku_ops = { 6681 .rpc_call_prepare = nfs4_locku_prepare, 6682 .rpc_call_done = nfs4_locku_done, 6683 .rpc_release = nfs4_locku_release_calldata, 6684 }; 6685 6686 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6687 struct nfs_open_context *ctx, 6688 struct nfs4_lock_state *lsp, 6689 struct nfs_seqid *seqid) 6690 { 6691 struct nfs4_unlockdata *data; 6692 struct rpc_message msg = { 6693 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6694 .rpc_cred = ctx->cred, 6695 }; 6696 struct rpc_task_setup task_setup_data = { 6697 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6698 .rpc_message = &msg, 6699 .callback_ops = &nfs4_locku_ops, 6700 .workqueue = nfsiod_workqueue, 6701 .flags = RPC_TASK_ASYNC, 6702 }; 6703 6704 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6705 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6706 6707 /* Ensure this is an unlock - when canceling a lock, the 6708 * canceled lock is passed in, and it won't be an unlock. 6709 */ 6710 fl->fl_type = F_UNLCK; 6711 if (fl->fl_flags & FL_CLOSE) 6712 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6713 6714 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6715 if (data == NULL) { 6716 nfs_free_seqid(seqid); 6717 return ERR_PTR(-ENOMEM); 6718 } 6719 6720 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6721 msg.rpc_argp = &data->arg; 6722 msg.rpc_resp = &data->res; 6723 task_setup_data.callback_data = data; 6724 return rpc_run_task(&task_setup_data); 6725 } 6726 6727 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6728 { 6729 struct inode *inode = state->inode; 6730 struct nfs4_state_owner *sp = state->owner; 6731 struct nfs_inode *nfsi = NFS_I(inode); 6732 struct nfs_seqid *seqid; 6733 struct nfs4_lock_state *lsp; 6734 struct rpc_task *task; 6735 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6736 int status = 0; 6737 unsigned char fl_flags = request->fl_flags; 6738 6739 status = nfs4_set_lock_state(state, request); 6740 /* Unlock _before_ we do the RPC call */ 6741 request->fl_flags |= FL_EXISTS; 6742 /* Exclude nfs_delegation_claim_locks() */ 6743 mutex_lock(&sp->so_delegreturn_mutex); 6744 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 6745 down_read(&nfsi->rwsem); 6746 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 6747 up_read(&nfsi->rwsem); 6748 mutex_unlock(&sp->so_delegreturn_mutex); 6749 goto out; 6750 } 6751 up_read(&nfsi->rwsem); 6752 mutex_unlock(&sp->so_delegreturn_mutex); 6753 if (status != 0) 6754 goto out; 6755 /* Is this a delegated lock? */ 6756 lsp = request->fl_u.nfs4_fl.owner; 6757 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 6758 goto out; 6759 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 6760 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 6761 status = -ENOMEM; 6762 if (IS_ERR(seqid)) 6763 goto out; 6764 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 6765 status = PTR_ERR(task); 6766 if (IS_ERR(task)) 6767 goto out; 6768 status = rpc_wait_for_completion_task(task); 6769 rpc_put_task(task); 6770 out: 6771 request->fl_flags = fl_flags; 6772 trace_nfs4_unlock(request, state, F_SETLK, status); 6773 return status; 6774 } 6775 6776 struct nfs4_lockdata { 6777 struct nfs_lock_args arg; 6778 struct nfs_lock_res res; 6779 struct nfs4_lock_state *lsp; 6780 struct nfs_open_context *ctx; 6781 struct file_lock fl; 6782 unsigned long timestamp; 6783 int rpc_status; 6784 int cancelled; 6785 struct nfs_server *server; 6786 }; 6787 6788 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 6789 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 6790 gfp_t gfp_mask) 6791 { 6792 struct nfs4_lockdata *p; 6793 struct inode *inode = lsp->ls_state->inode; 6794 struct nfs_server *server = NFS_SERVER(inode); 6795 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6796 6797 p = kzalloc(sizeof(*p), gfp_mask); 6798 if (p == NULL) 6799 return NULL; 6800 6801 p->arg.fh = NFS_FH(inode); 6802 p->arg.fl = &p->fl; 6803 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 6804 if (IS_ERR(p->arg.open_seqid)) 6805 goto out_free; 6806 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 6807 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 6808 if (IS_ERR(p->arg.lock_seqid)) 6809 goto out_free_seqid; 6810 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 6811 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 6812 p->arg.lock_owner.s_dev = server->s_dev; 6813 p->res.lock_seqid = p->arg.lock_seqid; 6814 p->lsp = lsp; 6815 p->server = server; 6816 p->ctx = get_nfs_open_context(ctx); 6817 locks_init_lock(&p->fl); 6818 locks_copy_lock(&p->fl, fl); 6819 return p; 6820 out_free_seqid: 6821 nfs_free_seqid(p->arg.open_seqid); 6822 out_free: 6823 kfree(p); 6824 return NULL; 6825 } 6826 6827 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 6828 { 6829 struct nfs4_lockdata *data = calldata; 6830 struct nfs4_state *state = data->lsp->ls_state; 6831 6832 dprintk("%s: begin!\n", __func__); 6833 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 6834 goto out_wait; 6835 /* Do we need to do an open_to_lock_owner? */ 6836 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 6837 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 6838 goto out_release_lock_seqid; 6839 } 6840 nfs4_stateid_copy(&data->arg.open_stateid, 6841 &state->open_stateid); 6842 data->arg.new_lock_owner = 1; 6843 data->res.open_seqid = data->arg.open_seqid; 6844 } else { 6845 data->arg.new_lock_owner = 0; 6846 nfs4_stateid_copy(&data->arg.lock_stateid, 6847 &data->lsp->ls_stateid); 6848 } 6849 if (!nfs4_valid_open_stateid(state)) { 6850 data->rpc_status = -EBADF; 6851 task->tk_action = NULL; 6852 goto out_release_open_seqid; 6853 } 6854 data->timestamp = jiffies; 6855 if (nfs4_setup_sequence(data->server->nfs_client, 6856 &data->arg.seq_args, 6857 &data->res.seq_res, 6858 task) == 0) 6859 return; 6860 out_release_open_seqid: 6861 nfs_release_seqid(data->arg.open_seqid); 6862 out_release_lock_seqid: 6863 nfs_release_seqid(data->arg.lock_seqid); 6864 out_wait: 6865 nfs4_sequence_done(task, &data->res.seq_res); 6866 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 6867 } 6868 6869 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 6870 { 6871 struct nfs4_lockdata *data = calldata; 6872 struct nfs4_lock_state *lsp = data->lsp; 6873 6874 dprintk("%s: begin!\n", __func__); 6875 6876 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6877 return; 6878 6879 data->rpc_status = task->tk_status; 6880 switch (task->tk_status) { 6881 case 0: 6882 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 6883 data->timestamp); 6884 if (data->arg.new_lock && !data->cancelled) { 6885 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 6886 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 6887 goto out_restart; 6888 } 6889 if (data->arg.new_lock_owner != 0) { 6890 nfs_confirm_seqid(&lsp->ls_seqid, 0); 6891 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 6892 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6893 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 6894 goto out_restart; 6895 break; 6896 case -NFS4ERR_BAD_STATEID: 6897 case -NFS4ERR_OLD_STATEID: 6898 case -NFS4ERR_STALE_STATEID: 6899 case -NFS4ERR_EXPIRED: 6900 if (data->arg.new_lock_owner != 0) { 6901 if (!nfs4_stateid_match(&data->arg.open_stateid, 6902 &lsp->ls_state->open_stateid)) 6903 goto out_restart; 6904 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 6905 &lsp->ls_stateid)) 6906 goto out_restart; 6907 } 6908 out_done: 6909 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 6910 return; 6911 out_restart: 6912 if (!data->cancelled) 6913 rpc_restart_call_prepare(task); 6914 goto out_done; 6915 } 6916 6917 static void nfs4_lock_release(void *calldata) 6918 { 6919 struct nfs4_lockdata *data = calldata; 6920 6921 dprintk("%s: begin!\n", __func__); 6922 nfs_free_seqid(data->arg.open_seqid); 6923 if (data->cancelled && data->rpc_status == 0) { 6924 struct rpc_task *task; 6925 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 6926 data->arg.lock_seqid); 6927 if (!IS_ERR(task)) 6928 rpc_put_task_async(task); 6929 dprintk("%s: cancelling lock!\n", __func__); 6930 } else 6931 nfs_free_seqid(data->arg.lock_seqid); 6932 nfs4_put_lock_state(data->lsp); 6933 put_nfs_open_context(data->ctx); 6934 kfree(data); 6935 dprintk("%s: done!\n", __func__); 6936 } 6937 6938 static const struct rpc_call_ops nfs4_lock_ops = { 6939 .rpc_call_prepare = nfs4_lock_prepare, 6940 .rpc_call_done = nfs4_lock_done, 6941 .rpc_release = nfs4_lock_release, 6942 }; 6943 6944 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 6945 { 6946 switch (error) { 6947 case -NFS4ERR_ADMIN_REVOKED: 6948 case -NFS4ERR_EXPIRED: 6949 case -NFS4ERR_BAD_STATEID: 6950 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6951 if (new_lock_owner != 0 || 6952 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 6953 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 6954 break; 6955 case -NFS4ERR_STALE_STATEID: 6956 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6957 nfs4_schedule_lease_recovery(server->nfs_client); 6958 } 6959 } 6960 6961 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 6962 { 6963 struct nfs4_lockdata *data; 6964 struct rpc_task *task; 6965 struct rpc_message msg = { 6966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 6967 .rpc_cred = state->owner->so_cred, 6968 }; 6969 struct rpc_task_setup task_setup_data = { 6970 .rpc_client = NFS_CLIENT(state->inode), 6971 .rpc_message = &msg, 6972 .callback_ops = &nfs4_lock_ops, 6973 .workqueue = nfsiod_workqueue, 6974 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 6975 }; 6976 int ret; 6977 6978 dprintk("%s: begin!\n", __func__); 6979 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 6980 fl->fl_u.nfs4_fl.owner, 6981 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 6982 if (data == NULL) 6983 return -ENOMEM; 6984 if (IS_SETLKW(cmd)) 6985 data->arg.block = 1; 6986 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 6987 recovery_type > NFS_LOCK_NEW); 6988 msg.rpc_argp = &data->arg; 6989 msg.rpc_resp = &data->res; 6990 task_setup_data.callback_data = data; 6991 if (recovery_type > NFS_LOCK_NEW) { 6992 if (recovery_type == NFS_LOCK_RECLAIM) 6993 data->arg.reclaim = NFS_LOCK_RECLAIM; 6994 } else 6995 data->arg.new_lock = 1; 6996 task = rpc_run_task(&task_setup_data); 6997 if (IS_ERR(task)) 6998 return PTR_ERR(task); 6999 ret = rpc_wait_for_completion_task(task); 7000 if (ret == 0) { 7001 ret = data->rpc_status; 7002 if (ret) 7003 nfs4_handle_setlk_error(data->server, data->lsp, 7004 data->arg.new_lock_owner, ret); 7005 } else 7006 data->cancelled = true; 7007 rpc_put_task(task); 7008 dprintk("%s: done, ret = %d!\n", __func__, ret); 7009 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7010 return ret; 7011 } 7012 7013 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7014 { 7015 struct nfs_server *server = NFS_SERVER(state->inode); 7016 struct nfs4_exception exception = { 7017 .inode = state->inode, 7018 }; 7019 int err; 7020 7021 do { 7022 /* Cache the lock if possible... */ 7023 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7024 return 0; 7025 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7026 if (err != -NFS4ERR_DELAY) 7027 break; 7028 nfs4_handle_exception(server, err, &exception); 7029 } while (exception.retry); 7030 return err; 7031 } 7032 7033 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7034 { 7035 struct nfs_server *server = NFS_SERVER(state->inode); 7036 struct nfs4_exception exception = { 7037 .inode = state->inode, 7038 }; 7039 int err; 7040 7041 err = nfs4_set_lock_state(state, request); 7042 if (err != 0) 7043 return err; 7044 if (!recover_lost_locks) { 7045 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7046 return 0; 7047 } 7048 do { 7049 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7050 return 0; 7051 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7052 switch (err) { 7053 default: 7054 goto out; 7055 case -NFS4ERR_GRACE: 7056 case -NFS4ERR_DELAY: 7057 nfs4_handle_exception(server, err, &exception); 7058 err = 0; 7059 } 7060 } while (exception.retry); 7061 out: 7062 return err; 7063 } 7064 7065 #if defined(CONFIG_NFS_V4_1) 7066 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7067 { 7068 struct nfs4_lock_state *lsp; 7069 int status; 7070 7071 status = nfs4_set_lock_state(state, request); 7072 if (status != 0) 7073 return status; 7074 lsp = request->fl_u.nfs4_fl.owner; 7075 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7076 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7077 return 0; 7078 return nfs4_lock_expired(state, request); 7079 } 7080 #endif 7081 7082 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7083 { 7084 struct nfs_inode *nfsi = NFS_I(state->inode); 7085 struct nfs4_state_owner *sp = state->owner; 7086 unsigned char fl_flags = request->fl_flags; 7087 int status; 7088 7089 request->fl_flags |= FL_ACCESS; 7090 status = locks_lock_inode_wait(state->inode, request); 7091 if (status < 0) 7092 goto out; 7093 mutex_lock(&sp->so_delegreturn_mutex); 7094 down_read(&nfsi->rwsem); 7095 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7096 /* Yes: cache locks! */ 7097 /* ...but avoid races with delegation recall... */ 7098 request->fl_flags = fl_flags & ~FL_SLEEP; 7099 status = locks_lock_inode_wait(state->inode, request); 7100 up_read(&nfsi->rwsem); 7101 mutex_unlock(&sp->so_delegreturn_mutex); 7102 goto out; 7103 } 7104 up_read(&nfsi->rwsem); 7105 mutex_unlock(&sp->so_delegreturn_mutex); 7106 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7107 out: 7108 request->fl_flags = fl_flags; 7109 return status; 7110 } 7111 7112 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7113 { 7114 struct nfs4_exception exception = { 7115 .state = state, 7116 .inode = state->inode, 7117 .interruptible = true, 7118 }; 7119 int err; 7120 7121 do { 7122 err = _nfs4_proc_setlk(state, cmd, request); 7123 if (err == -NFS4ERR_DENIED) 7124 err = -EAGAIN; 7125 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7126 err, &exception); 7127 } while (exception.retry); 7128 return err; 7129 } 7130 7131 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7132 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7133 7134 static int 7135 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7136 struct file_lock *request) 7137 { 7138 int status = -ERESTARTSYS; 7139 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7140 7141 while(!signalled()) { 7142 status = nfs4_proc_setlk(state, cmd, request); 7143 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7144 break; 7145 freezable_schedule_timeout_interruptible(timeout); 7146 timeout *= 2; 7147 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7148 status = -ERESTARTSYS; 7149 } 7150 return status; 7151 } 7152 7153 #ifdef CONFIG_NFS_V4_1 7154 struct nfs4_lock_waiter { 7155 struct task_struct *task; 7156 struct inode *inode; 7157 struct nfs_lowner *owner; 7158 }; 7159 7160 static int 7161 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7162 { 7163 int ret; 7164 struct nfs4_lock_waiter *waiter = wait->private; 7165 7166 /* NULL key means to wake up everyone */ 7167 if (key) { 7168 struct cb_notify_lock_args *cbnl = key; 7169 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7170 *wowner = waiter->owner; 7171 7172 /* Only wake if the callback was for the same owner. */ 7173 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7174 return 0; 7175 7176 /* Make sure it's for the right inode */ 7177 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7178 return 0; 7179 } 7180 7181 /* override "private" so we can use default_wake_function */ 7182 wait->private = waiter->task; 7183 ret = woken_wake_function(wait, mode, flags, key); 7184 if (ret) 7185 list_del_init(&wait->entry); 7186 wait->private = waiter; 7187 return ret; 7188 } 7189 7190 static int 7191 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7192 { 7193 int status = -ERESTARTSYS; 7194 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7195 struct nfs_server *server = NFS_SERVER(state->inode); 7196 struct nfs_client *clp = server->nfs_client; 7197 wait_queue_head_t *q = &clp->cl_lock_waitq; 7198 struct nfs_lowner owner = { .clientid = clp->cl_clientid, 7199 .id = lsp->ls_seqid.owner_id, 7200 .s_dev = server->s_dev }; 7201 struct nfs4_lock_waiter waiter = { .task = current, 7202 .inode = state->inode, 7203 .owner = &owner}; 7204 wait_queue_entry_t wait; 7205 7206 /* Don't bother with waitqueue if we don't expect a callback */ 7207 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7208 return nfs4_retry_setlk_simple(state, cmd, request); 7209 7210 init_wait(&wait); 7211 wait.private = &waiter; 7212 wait.func = nfs4_wake_lock_waiter; 7213 7214 while(!signalled()) { 7215 add_wait_queue(q, &wait); 7216 status = nfs4_proc_setlk(state, cmd, request); 7217 if ((status != -EAGAIN) || IS_SETLK(cmd)) { 7218 finish_wait(q, &wait); 7219 break; 7220 } 7221 7222 status = -ERESTARTSYS; 7223 freezer_do_not_count(); 7224 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT); 7225 freezer_count(); 7226 finish_wait(q, &wait); 7227 } 7228 7229 return status; 7230 } 7231 #else /* !CONFIG_NFS_V4_1 */ 7232 static inline int 7233 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7234 { 7235 return nfs4_retry_setlk_simple(state, cmd, request); 7236 } 7237 #endif 7238 7239 static int 7240 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7241 { 7242 struct nfs_open_context *ctx; 7243 struct nfs4_state *state; 7244 int status; 7245 7246 /* verify open state */ 7247 ctx = nfs_file_open_context(filp); 7248 state = ctx->state; 7249 7250 if (IS_GETLK(cmd)) { 7251 if (state != NULL) 7252 return nfs4_proc_getlk(state, F_GETLK, request); 7253 return 0; 7254 } 7255 7256 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7257 return -EINVAL; 7258 7259 if (request->fl_type == F_UNLCK) { 7260 if (state != NULL) 7261 return nfs4_proc_unlck(state, cmd, request); 7262 return 0; 7263 } 7264 7265 if (state == NULL) 7266 return -ENOLCK; 7267 7268 if ((request->fl_flags & FL_POSIX) && 7269 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7270 return -ENOLCK; 7271 7272 /* 7273 * Don't rely on the VFS having checked the file open mode, 7274 * since it won't do this for flock() locks. 7275 */ 7276 switch (request->fl_type) { 7277 case F_RDLCK: 7278 if (!(filp->f_mode & FMODE_READ)) 7279 return -EBADF; 7280 break; 7281 case F_WRLCK: 7282 if (!(filp->f_mode & FMODE_WRITE)) 7283 return -EBADF; 7284 } 7285 7286 status = nfs4_set_lock_state(state, request); 7287 if (status != 0) 7288 return status; 7289 7290 return nfs4_retry_setlk(state, cmd, request); 7291 } 7292 7293 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7294 { 7295 struct nfs_server *server = NFS_SERVER(state->inode); 7296 int err; 7297 7298 err = nfs4_set_lock_state(state, fl); 7299 if (err != 0) 7300 return err; 7301 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7302 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7303 } 7304 7305 struct nfs_release_lockowner_data { 7306 struct nfs4_lock_state *lsp; 7307 struct nfs_server *server; 7308 struct nfs_release_lockowner_args args; 7309 struct nfs_release_lockowner_res res; 7310 unsigned long timestamp; 7311 }; 7312 7313 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7314 { 7315 struct nfs_release_lockowner_data *data = calldata; 7316 struct nfs_server *server = data->server; 7317 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7318 &data->res.seq_res, task); 7319 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7320 data->timestamp = jiffies; 7321 } 7322 7323 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7324 { 7325 struct nfs_release_lockowner_data *data = calldata; 7326 struct nfs_server *server = data->server; 7327 7328 nfs40_sequence_done(task, &data->res.seq_res); 7329 7330 switch (task->tk_status) { 7331 case 0: 7332 renew_lease(server, data->timestamp); 7333 break; 7334 case -NFS4ERR_STALE_CLIENTID: 7335 case -NFS4ERR_EXPIRED: 7336 nfs4_schedule_lease_recovery(server->nfs_client); 7337 break; 7338 case -NFS4ERR_LEASE_MOVED: 7339 case -NFS4ERR_DELAY: 7340 if (nfs4_async_handle_error(task, server, 7341 NULL, NULL) == -EAGAIN) 7342 rpc_restart_call_prepare(task); 7343 } 7344 } 7345 7346 static void nfs4_release_lockowner_release(void *calldata) 7347 { 7348 struct nfs_release_lockowner_data *data = calldata; 7349 nfs4_free_lock_state(data->server, data->lsp); 7350 kfree(calldata); 7351 } 7352 7353 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7354 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7355 .rpc_call_done = nfs4_release_lockowner_done, 7356 .rpc_release = nfs4_release_lockowner_release, 7357 }; 7358 7359 static void 7360 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7361 { 7362 struct nfs_release_lockowner_data *data; 7363 struct rpc_message msg = { 7364 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7365 }; 7366 7367 if (server->nfs_client->cl_mvops->minor_version != 0) 7368 return; 7369 7370 data = kmalloc(sizeof(*data), GFP_NOFS); 7371 if (!data) 7372 return; 7373 data->lsp = lsp; 7374 data->server = server; 7375 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7376 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7377 data->args.lock_owner.s_dev = server->s_dev; 7378 7379 msg.rpc_argp = &data->args; 7380 msg.rpc_resp = &data->res; 7381 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7382 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7383 } 7384 7385 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7386 7387 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7388 struct dentry *unused, struct inode *inode, 7389 const char *key, const void *buf, 7390 size_t buflen, int flags) 7391 { 7392 return nfs4_proc_set_acl(inode, buf, buflen); 7393 } 7394 7395 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7396 struct dentry *unused, struct inode *inode, 7397 const char *key, void *buf, size_t buflen) 7398 { 7399 return nfs4_proc_get_acl(inode, buf, buflen); 7400 } 7401 7402 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7403 { 7404 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 7405 } 7406 7407 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7408 7409 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7410 struct dentry *unused, struct inode *inode, 7411 const char *key, const void *buf, 7412 size_t buflen, int flags) 7413 { 7414 if (security_ismaclabel(key)) 7415 return nfs4_set_security_label(inode, buf, buflen); 7416 7417 return -EOPNOTSUPP; 7418 } 7419 7420 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7421 struct dentry *unused, struct inode *inode, 7422 const char *key, void *buf, size_t buflen) 7423 { 7424 if (security_ismaclabel(key)) 7425 return nfs4_get_security_label(inode, buf, buflen); 7426 return -EOPNOTSUPP; 7427 } 7428 7429 static ssize_t 7430 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7431 { 7432 int len = 0; 7433 7434 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7435 len = security_inode_listsecurity(inode, list, list_len); 7436 if (list_len && len > list_len) 7437 return -ERANGE; 7438 } 7439 return len; 7440 } 7441 7442 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7443 .prefix = XATTR_SECURITY_PREFIX, 7444 .get = nfs4_xattr_get_nfs4_label, 7445 .set = nfs4_xattr_set_nfs4_label, 7446 }; 7447 7448 #else 7449 7450 static ssize_t 7451 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7452 { 7453 return 0; 7454 } 7455 7456 #endif 7457 7458 #ifdef CONFIG_NFS_V4_2 7459 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7460 struct dentry *unused, struct inode *inode, 7461 const char *key, const void *buf, 7462 size_t buflen, int flags) 7463 { 7464 struct nfs_access_entry cache; 7465 int ret; 7466 7467 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7468 return -EOPNOTSUPP; 7469 7470 /* 7471 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7472 * flags right now. Handling of xattr operations use the normal 7473 * file read/write permissions. 7474 * 7475 * Just in case the server has other ideas (which RFC 8276 allows), 7476 * do a cached access check for the XA* flags to possibly avoid 7477 * doing an RPC and getting EACCES back. 7478 */ 7479 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) { 7480 if (!(cache.mask & NFS_ACCESS_XAWRITE)) 7481 return -EACCES; 7482 } 7483 7484 if (buf == NULL) { 7485 ret = nfs42_proc_removexattr(inode, key); 7486 if (!ret) 7487 nfs4_xattr_cache_remove(inode, key); 7488 } else { 7489 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7490 if (!ret) 7491 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7492 } 7493 7494 return ret; 7495 } 7496 7497 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7498 struct dentry *unused, struct inode *inode, 7499 const char *key, void *buf, size_t buflen) 7500 { 7501 struct nfs_access_entry cache; 7502 ssize_t ret; 7503 7504 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7505 return -EOPNOTSUPP; 7506 7507 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) { 7508 if (!(cache.mask & NFS_ACCESS_XAREAD)) 7509 return -EACCES; 7510 } 7511 7512 ret = nfs_revalidate_inode(NFS_SERVER(inode), inode); 7513 if (ret) 7514 return ret; 7515 7516 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7517 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7518 return ret; 7519 7520 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7521 7522 return ret; 7523 } 7524 7525 static ssize_t 7526 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7527 { 7528 u64 cookie; 7529 bool eof; 7530 ssize_t ret, size; 7531 char *buf; 7532 size_t buflen; 7533 struct nfs_access_entry cache; 7534 7535 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7536 return 0; 7537 7538 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) { 7539 if (!(cache.mask & NFS_ACCESS_XALIST)) 7540 return 0; 7541 } 7542 7543 ret = nfs_revalidate_inode(NFS_SERVER(inode), inode); 7544 if (ret) 7545 return ret; 7546 7547 ret = nfs4_xattr_cache_list(inode, list, list_len); 7548 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7549 return ret; 7550 7551 cookie = 0; 7552 eof = false; 7553 buflen = list_len ? list_len : XATTR_LIST_MAX; 7554 buf = list_len ? list : NULL; 7555 size = 0; 7556 7557 while (!eof) { 7558 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7559 &cookie, &eof); 7560 if (ret < 0) 7561 return ret; 7562 7563 if (list_len) { 7564 buf += ret; 7565 buflen -= ret; 7566 } 7567 size += ret; 7568 } 7569 7570 if (list_len) 7571 nfs4_xattr_cache_set_list(inode, list, size); 7572 7573 return size; 7574 } 7575 7576 #else 7577 7578 static ssize_t 7579 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7580 { 7581 return 0; 7582 } 7583 #endif /* CONFIG_NFS_V4_2 */ 7584 7585 /* 7586 * nfs_fhget will use either the mounted_on_fileid or the fileid 7587 */ 7588 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7589 { 7590 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7591 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7592 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7593 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7594 return; 7595 7596 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7597 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7598 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7599 fattr->nlink = 2; 7600 } 7601 7602 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7603 const struct qstr *name, 7604 struct nfs4_fs_locations *fs_locations, 7605 struct page *page) 7606 { 7607 struct nfs_server *server = NFS_SERVER(dir); 7608 u32 bitmask[3]; 7609 struct nfs4_fs_locations_arg args = { 7610 .dir_fh = NFS_FH(dir), 7611 .name = name, 7612 .page = page, 7613 .bitmask = bitmask, 7614 }; 7615 struct nfs4_fs_locations_res res = { 7616 .fs_locations = fs_locations, 7617 }; 7618 struct rpc_message msg = { 7619 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7620 .rpc_argp = &args, 7621 .rpc_resp = &res, 7622 }; 7623 int status; 7624 7625 dprintk("%s: start\n", __func__); 7626 7627 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7628 bitmask[1] = nfs4_fattr_bitmap[1]; 7629 7630 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7631 * is not supported */ 7632 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7633 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7634 else 7635 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7636 7637 nfs_fattr_init(&fs_locations->fattr); 7638 fs_locations->server = server; 7639 fs_locations->nlocations = 0; 7640 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7641 dprintk("%s: returned status = %d\n", __func__, status); 7642 return status; 7643 } 7644 7645 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7646 const struct qstr *name, 7647 struct nfs4_fs_locations *fs_locations, 7648 struct page *page) 7649 { 7650 struct nfs4_exception exception = { 7651 .interruptible = true, 7652 }; 7653 int err; 7654 do { 7655 err = _nfs4_proc_fs_locations(client, dir, name, 7656 fs_locations, page); 7657 trace_nfs4_get_fs_locations(dir, name, err); 7658 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7659 &exception); 7660 } while (exception.retry); 7661 return err; 7662 } 7663 7664 /* 7665 * This operation also signals the server that this client is 7666 * performing migration recovery. The server can stop returning 7667 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 7668 * appended to this compound to identify the client ID which is 7669 * performing recovery. 7670 */ 7671 static int _nfs40_proc_get_locations(struct inode *inode, 7672 struct nfs4_fs_locations *locations, 7673 struct page *page, const struct cred *cred) 7674 { 7675 struct nfs_server *server = NFS_SERVER(inode); 7676 struct rpc_clnt *clnt = server->client; 7677 u32 bitmask[2] = { 7678 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7679 }; 7680 struct nfs4_fs_locations_arg args = { 7681 .clientid = server->nfs_client->cl_clientid, 7682 .fh = NFS_FH(inode), 7683 .page = page, 7684 .bitmask = bitmask, 7685 .migration = 1, /* skip LOOKUP */ 7686 .renew = 1, /* append RENEW */ 7687 }; 7688 struct nfs4_fs_locations_res res = { 7689 .fs_locations = locations, 7690 .migration = 1, 7691 .renew = 1, 7692 }; 7693 struct rpc_message msg = { 7694 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7695 .rpc_argp = &args, 7696 .rpc_resp = &res, 7697 .rpc_cred = cred, 7698 }; 7699 unsigned long now = jiffies; 7700 int status; 7701 7702 nfs_fattr_init(&locations->fattr); 7703 locations->server = server; 7704 locations->nlocations = 0; 7705 7706 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7707 status = nfs4_call_sync_sequence(clnt, server, &msg, 7708 &args.seq_args, &res.seq_res); 7709 if (status) 7710 return status; 7711 7712 renew_lease(server, now); 7713 return 0; 7714 } 7715 7716 #ifdef CONFIG_NFS_V4_1 7717 7718 /* 7719 * This operation also signals the server that this client is 7720 * performing migration recovery. The server can stop asserting 7721 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 7722 * performing this operation is identified in the SEQUENCE 7723 * operation in this compound. 7724 * 7725 * When the client supports GETATTR(fs_locations_info), it can 7726 * be plumbed in here. 7727 */ 7728 static int _nfs41_proc_get_locations(struct inode *inode, 7729 struct nfs4_fs_locations *locations, 7730 struct page *page, const struct cred *cred) 7731 { 7732 struct nfs_server *server = NFS_SERVER(inode); 7733 struct rpc_clnt *clnt = server->client; 7734 u32 bitmask[2] = { 7735 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7736 }; 7737 struct nfs4_fs_locations_arg args = { 7738 .fh = NFS_FH(inode), 7739 .page = page, 7740 .bitmask = bitmask, 7741 .migration = 1, /* skip LOOKUP */ 7742 }; 7743 struct nfs4_fs_locations_res res = { 7744 .fs_locations = locations, 7745 .migration = 1, 7746 }; 7747 struct rpc_message msg = { 7748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7749 .rpc_argp = &args, 7750 .rpc_resp = &res, 7751 .rpc_cred = cred, 7752 }; 7753 int status; 7754 7755 nfs_fattr_init(&locations->fattr); 7756 locations->server = server; 7757 locations->nlocations = 0; 7758 7759 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7760 status = nfs4_call_sync_sequence(clnt, server, &msg, 7761 &args.seq_args, &res.seq_res); 7762 if (status == NFS4_OK && 7763 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7764 status = -NFS4ERR_LEASE_MOVED; 7765 return status; 7766 } 7767 7768 #endif /* CONFIG_NFS_V4_1 */ 7769 7770 /** 7771 * nfs4_proc_get_locations - discover locations for a migrated FSID 7772 * @inode: inode on FSID that is migrating 7773 * @locations: result of query 7774 * @page: buffer 7775 * @cred: credential to use for this operation 7776 * 7777 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 7778 * operation failed, or a negative errno if a local error occurred. 7779 * 7780 * On success, "locations" is filled in, but if the server has 7781 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 7782 * asserted. 7783 * 7784 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 7785 * from this client that require migration recovery. 7786 */ 7787 int nfs4_proc_get_locations(struct inode *inode, 7788 struct nfs4_fs_locations *locations, 7789 struct page *page, const struct cred *cred) 7790 { 7791 struct nfs_server *server = NFS_SERVER(inode); 7792 struct nfs_client *clp = server->nfs_client; 7793 const struct nfs4_mig_recovery_ops *ops = 7794 clp->cl_mvops->mig_recovery_ops; 7795 struct nfs4_exception exception = { 7796 .interruptible = true, 7797 }; 7798 int status; 7799 7800 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7801 (unsigned long long)server->fsid.major, 7802 (unsigned long long)server->fsid.minor, 7803 clp->cl_hostname); 7804 nfs_display_fhandle(NFS_FH(inode), __func__); 7805 7806 do { 7807 status = ops->get_locations(inode, locations, page, cred); 7808 if (status != -NFS4ERR_DELAY) 7809 break; 7810 nfs4_handle_exception(server, status, &exception); 7811 } while (exception.retry); 7812 return status; 7813 } 7814 7815 /* 7816 * This operation also signals the server that this client is 7817 * performing "lease moved" recovery. The server can stop 7818 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 7819 * is appended to this compound to identify the client ID which is 7820 * performing recovery. 7821 */ 7822 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 7823 { 7824 struct nfs_server *server = NFS_SERVER(inode); 7825 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 7826 struct rpc_clnt *clnt = server->client; 7827 struct nfs4_fsid_present_arg args = { 7828 .fh = NFS_FH(inode), 7829 .clientid = clp->cl_clientid, 7830 .renew = 1, /* append RENEW */ 7831 }; 7832 struct nfs4_fsid_present_res res = { 7833 .renew = 1, 7834 }; 7835 struct rpc_message msg = { 7836 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7837 .rpc_argp = &args, 7838 .rpc_resp = &res, 7839 .rpc_cred = cred, 7840 }; 7841 unsigned long now = jiffies; 7842 int status; 7843 7844 res.fh = nfs_alloc_fhandle(); 7845 if (res.fh == NULL) 7846 return -ENOMEM; 7847 7848 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7849 status = nfs4_call_sync_sequence(clnt, server, &msg, 7850 &args.seq_args, &res.seq_res); 7851 nfs_free_fhandle(res.fh); 7852 if (status) 7853 return status; 7854 7855 do_renew_lease(clp, now); 7856 return 0; 7857 } 7858 7859 #ifdef CONFIG_NFS_V4_1 7860 7861 /* 7862 * This operation also signals the server that this client is 7863 * performing "lease moved" recovery. The server can stop asserting 7864 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 7865 * this operation is identified in the SEQUENCE operation in this 7866 * compound. 7867 */ 7868 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 7869 { 7870 struct nfs_server *server = NFS_SERVER(inode); 7871 struct rpc_clnt *clnt = server->client; 7872 struct nfs4_fsid_present_arg args = { 7873 .fh = NFS_FH(inode), 7874 }; 7875 struct nfs4_fsid_present_res res = { 7876 }; 7877 struct rpc_message msg = { 7878 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7879 .rpc_argp = &args, 7880 .rpc_resp = &res, 7881 .rpc_cred = cred, 7882 }; 7883 int status; 7884 7885 res.fh = nfs_alloc_fhandle(); 7886 if (res.fh == NULL) 7887 return -ENOMEM; 7888 7889 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7890 status = nfs4_call_sync_sequence(clnt, server, &msg, 7891 &args.seq_args, &res.seq_res); 7892 nfs_free_fhandle(res.fh); 7893 if (status == NFS4_OK && 7894 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7895 status = -NFS4ERR_LEASE_MOVED; 7896 return status; 7897 } 7898 7899 #endif /* CONFIG_NFS_V4_1 */ 7900 7901 /** 7902 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 7903 * @inode: inode on FSID to check 7904 * @cred: credential to use for this operation 7905 * 7906 * Server indicates whether the FSID is present, moved, or not 7907 * recognized. This operation is necessary to clear a LEASE_MOVED 7908 * condition for this client ID. 7909 * 7910 * Returns NFS4_OK if the FSID is present on this server, 7911 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 7912 * NFS4ERR code if some error occurred on the server, or a 7913 * negative errno if a local failure occurred. 7914 */ 7915 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 7916 { 7917 struct nfs_server *server = NFS_SERVER(inode); 7918 struct nfs_client *clp = server->nfs_client; 7919 const struct nfs4_mig_recovery_ops *ops = 7920 clp->cl_mvops->mig_recovery_ops; 7921 struct nfs4_exception exception = { 7922 .interruptible = true, 7923 }; 7924 int status; 7925 7926 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7927 (unsigned long long)server->fsid.major, 7928 (unsigned long long)server->fsid.minor, 7929 clp->cl_hostname); 7930 nfs_display_fhandle(NFS_FH(inode), __func__); 7931 7932 do { 7933 status = ops->fsid_present(inode, cred); 7934 if (status != -NFS4ERR_DELAY) 7935 break; 7936 nfs4_handle_exception(server, status, &exception); 7937 } while (exception.retry); 7938 return status; 7939 } 7940 7941 /* 7942 * If 'use_integrity' is true and the state managment nfs_client 7943 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 7944 * and the machine credential as per RFC3530bis and RFC5661 Security 7945 * Considerations sections. Otherwise, just use the user cred with the 7946 * filesystem's rpc_client. 7947 */ 7948 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7949 { 7950 int status; 7951 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 7952 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 7953 struct nfs4_secinfo_arg args = { 7954 .dir_fh = NFS_FH(dir), 7955 .name = name, 7956 }; 7957 struct nfs4_secinfo_res res = { 7958 .flavors = flavors, 7959 }; 7960 struct rpc_message msg = { 7961 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 7962 .rpc_argp = &args, 7963 .rpc_resp = &res, 7964 }; 7965 struct nfs4_call_sync_data data = { 7966 .seq_server = NFS_SERVER(dir), 7967 .seq_args = &args.seq_args, 7968 .seq_res = &res.seq_res, 7969 }; 7970 struct rpc_task_setup task_setup = { 7971 .rpc_client = clnt, 7972 .rpc_message = &msg, 7973 .callback_ops = clp->cl_mvops->call_sync_ops, 7974 .callback_data = &data, 7975 .flags = RPC_TASK_NO_ROUND_ROBIN, 7976 }; 7977 const struct cred *cred = NULL; 7978 7979 if (use_integrity) { 7980 clnt = clp->cl_rpcclient; 7981 task_setup.rpc_client = clnt; 7982 7983 cred = nfs4_get_clid_cred(clp); 7984 msg.rpc_cred = cred; 7985 } 7986 7987 dprintk("NFS call secinfo %s\n", name->name); 7988 7989 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 7990 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 7991 status = nfs4_call_sync_custom(&task_setup); 7992 7993 dprintk("NFS reply secinfo: %d\n", status); 7994 7995 put_cred(cred); 7996 return status; 7997 } 7998 7999 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8000 struct nfs4_secinfo_flavors *flavors) 8001 { 8002 struct nfs4_exception exception = { 8003 .interruptible = true, 8004 }; 8005 int err; 8006 do { 8007 err = -NFS4ERR_WRONGSEC; 8008 8009 /* try to use integrity protection with machine cred */ 8010 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8011 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8012 8013 /* 8014 * if unable to use integrity protection, or SECINFO with 8015 * integrity protection returns NFS4ERR_WRONGSEC (which is 8016 * disallowed by spec, but exists in deployed servers) use 8017 * the current filesystem's rpc_client and the user cred. 8018 */ 8019 if (err == -NFS4ERR_WRONGSEC) 8020 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8021 8022 trace_nfs4_secinfo(dir, name, err); 8023 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8024 &exception); 8025 } while (exception.retry); 8026 return err; 8027 } 8028 8029 #ifdef CONFIG_NFS_V4_1 8030 /* 8031 * Check the exchange flags returned by the server for invalid flags, having 8032 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8033 * DS flags set. 8034 */ 8035 static int nfs4_check_cl_exchange_flags(u32 flags) 8036 { 8037 if (flags & ~EXCHGID4_FLAG_MASK_R) 8038 goto out_inval; 8039 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8040 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8041 goto out_inval; 8042 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8043 goto out_inval; 8044 return NFS_OK; 8045 out_inval: 8046 return -NFS4ERR_INVAL; 8047 } 8048 8049 static bool 8050 nfs41_same_server_scope(struct nfs41_server_scope *a, 8051 struct nfs41_server_scope *b) 8052 { 8053 if (a->server_scope_sz != b->server_scope_sz) 8054 return false; 8055 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8056 } 8057 8058 static void 8059 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8060 { 8061 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8062 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8063 struct nfs_client *clp = args->client; 8064 8065 switch (task->tk_status) { 8066 case -NFS4ERR_BADSESSION: 8067 case -NFS4ERR_DEADSESSION: 8068 nfs4_schedule_session_recovery(clp->cl_session, 8069 task->tk_status); 8070 } 8071 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8072 res->dir != NFS4_CDFS4_BOTH) { 8073 rpc_task_close_connection(task); 8074 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8075 rpc_restart_call(task); 8076 } 8077 } 8078 8079 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8080 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8081 }; 8082 8083 /* 8084 * nfs4_proc_bind_one_conn_to_session() 8085 * 8086 * The 4.1 client currently uses the same TCP connection for the 8087 * fore and backchannel. 8088 */ 8089 static 8090 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8091 struct rpc_xprt *xprt, 8092 struct nfs_client *clp, 8093 const struct cred *cred) 8094 { 8095 int status; 8096 struct nfs41_bind_conn_to_session_args args = { 8097 .client = clp, 8098 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8099 .retries = 0, 8100 }; 8101 struct nfs41_bind_conn_to_session_res res; 8102 struct rpc_message msg = { 8103 .rpc_proc = 8104 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8105 .rpc_argp = &args, 8106 .rpc_resp = &res, 8107 .rpc_cred = cred, 8108 }; 8109 struct rpc_task_setup task_setup_data = { 8110 .rpc_client = clnt, 8111 .rpc_xprt = xprt, 8112 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8113 .rpc_message = &msg, 8114 .flags = RPC_TASK_TIMEOUT, 8115 }; 8116 struct rpc_task *task; 8117 8118 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8119 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8120 args.dir = NFS4_CDFC4_FORE; 8121 8122 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8123 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8124 args.dir = NFS4_CDFC4_FORE; 8125 8126 task = rpc_run_task(&task_setup_data); 8127 if (!IS_ERR(task)) { 8128 status = task->tk_status; 8129 rpc_put_task(task); 8130 } else 8131 status = PTR_ERR(task); 8132 trace_nfs4_bind_conn_to_session(clp, status); 8133 if (status == 0) { 8134 if (memcmp(res.sessionid.data, 8135 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8136 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8137 return -EIO; 8138 } 8139 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8140 dprintk("NFS: %s: Unexpected direction from server\n", 8141 __func__); 8142 return -EIO; 8143 } 8144 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8145 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8146 __func__); 8147 return -EIO; 8148 } 8149 } 8150 8151 return status; 8152 } 8153 8154 struct rpc_bind_conn_calldata { 8155 struct nfs_client *clp; 8156 const struct cred *cred; 8157 }; 8158 8159 static int 8160 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8161 struct rpc_xprt *xprt, 8162 void *calldata) 8163 { 8164 struct rpc_bind_conn_calldata *p = calldata; 8165 8166 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8167 } 8168 8169 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8170 { 8171 struct rpc_bind_conn_calldata data = { 8172 .clp = clp, 8173 .cred = cred, 8174 }; 8175 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8176 nfs4_proc_bind_conn_to_session_callback, &data); 8177 } 8178 8179 /* 8180 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8181 * and operations we'd like to see to enable certain features in the allow map 8182 */ 8183 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8184 .how = SP4_MACH_CRED, 8185 .enforce.u.words = { 8186 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8187 1 << (OP_EXCHANGE_ID - 32) | 8188 1 << (OP_CREATE_SESSION - 32) | 8189 1 << (OP_DESTROY_SESSION - 32) | 8190 1 << (OP_DESTROY_CLIENTID - 32) 8191 }, 8192 .allow.u.words = { 8193 [0] = 1 << (OP_CLOSE) | 8194 1 << (OP_OPEN_DOWNGRADE) | 8195 1 << (OP_LOCKU) | 8196 1 << (OP_DELEGRETURN) | 8197 1 << (OP_COMMIT), 8198 [1] = 1 << (OP_SECINFO - 32) | 8199 1 << (OP_SECINFO_NO_NAME - 32) | 8200 1 << (OP_LAYOUTRETURN - 32) | 8201 1 << (OP_TEST_STATEID - 32) | 8202 1 << (OP_FREE_STATEID - 32) | 8203 1 << (OP_WRITE - 32) 8204 } 8205 }; 8206 8207 /* 8208 * Select the state protection mode for client `clp' given the server results 8209 * from exchange_id in `sp'. 8210 * 8211 * Returns 0 on success, negative errno otherwise. 8212 */ 8213 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8214 struct nfs41_state_protection *sp) 8215 { 8216 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8217 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8218 1 << (OP_EXCHANGE_ID - 32) | 8219 1 << (OP_CREATE_SESSION - 32) | 8220 1 << (OP_DESTROY_SESSION - 32) | 8221 1 << (OP_DESTROY_CLIENTID - 32) 8222 }; 8223 unsigned long flags = 0; 8224 unsigned int i; 8225 int ret = 0; 8226 8227 if (sp->how == SP4_MACH_CRED) { 8228 /* Print state protect result */ 8229 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8230 for (i = 0; i <= LAST_NFS4_OP; i++) { 8231 if (test_bit(i, sp->enforce.u.longs)) 8232 dfprintk(MOUNT, " enforce op %d\n", i); 8233 if (test_bit(i, sp->allow.u.longs)) 8234 dfprintk(MOUNT, " allow op %d\n", i); 8235 } 8236 8237 /* make sure nothing is on enforce list that isn't supported */ 8238 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8239 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8240 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8241 ret = -EINVAL; 8242 goto out; 8243 } 8244 } 8245 8246 /* 8247 * Minimal mode - state operations are allowed to use machine 8248 * credential. Note this already happens by default, so the 8249 * client doesn't have to do anything more than the negotiation. 8250 * 8251 * NOTE: we don't care if EXCHANGE_ID is in the list - 8252 * we're already using the machine cred for exchange_id 8253 * and will never use a different cred. 8254 */ 8255 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8256 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8257 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8258 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8259 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8260 dfprintk(MOUNT, " minimal mode enabled\n"); 8261 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8262 } else { 8263 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8264 ret = -EINVAL; 8265 goto out; 8266 } 8267 8268 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8269 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8270 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8271 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8272 dfprintk(MOUNT, " cleanup mode enabled\n"); 8273 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8274 } 8275 8276 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8277 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8278 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8279 } 8280 8281 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8282 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8283 dfprintk(MOUNT, " secinfo mode enabled\n"); 8284 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8285 } 8286 8287 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8288 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8289 dfprintk(MOUNT, " stateid mode enabled\n"); 8290 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8291 } 8292 8293 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8294 dfprintk(MOUNT, " write mode enabled\n"); 8295 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8296 } 8297 8298 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8299 dfprintk(MOUNT, " commit mode enabled\n"); 8300 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8301 } 8302 } 8303 out: 8304 clp->cl_sp4_flags = flags; 8305 return ret; 8306 } 8307 8308 struct nfs41_exchange_id_data { 8309 struct nfs41_exchange_id_res res; 8310 struct nfs41_exchange_id_args args; 8311 }; 8312 8313 static void nfs4_exchange_id_release(void *data) 8314 { 8315 struct nfs41_exchange_id_data *cdata = 8316 (struct nfs41_exchange_id_data *)data; 8317 8318 nfs_put_client(cdata->args.client); 8319 kfree(cdata->res.impl_id); 8320 kfree(cdata->res.server_scope); 8321 kfree(cdata->res.server_owner); 8322 kfree(cdata); 8323 } 8324 8325 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8326 .rpc_release = nfs4_exchange_id_release, 8327 }; 8328 8329 /* 8330 * _nfs4_proc_exchange_id() 8331 * 8332 * Wrapper for EXCHANGE_ID operation. 8333 */ 8334 static struct rpc_task * 8335 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8336 u32 sp4_how, struct rpc_xprt *xprt) 8337 { 8338 struct rpc_message msg = { 8339 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8340 .rpc_cred = cred, 8341 }; 8342 struct rpc_task_setup task_setup_data = { 8343 .rpc_client = clp->cl_rpcclient, 8344 .callback_ops = &nfs4_exchange_id_call_ops, 8345 .rpc_message = &msg, 8346 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8347 }; 8348 struct nfs41_exchange_id_data *calldata; 8349 int status; 8350 8351 if (!refcount_inc_not_zero(&clp->cl_count)) 8352 return ERR_PTR(-EIO); 8353 8354 status = -ENOMEM; 8355 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8356 if (!calldata) 8357 goto out; 8358 8359 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8360 8361 status = nfs4_init_uniform_client_string(clp); 8362 if (status) 8363 goto out_calldata; 8364 8365 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8366 GFP_NOFS); 8367 status = -ENOMEM; 8368 if (unlikely(calldata->res.server_owner == NULL)) 8369 goto out_calldata; 8370 8371 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8372 GFP_NOFS); 8373 if (unlikely(calldata->res.server_scope == NULL)) 8374 goto out_server_owner; 8375 8376 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8377 if (unlikely(calldata->res.impl_id == NULL)) 8378 goto out_server_scope; 8379 8380 switch (sp4_how) { 8381 case SP4_NONE: 8382 calldata->args.state_protect.how = SP4_NONE; 8383 break; 8384 8385 case SP4_MACH_CRED: 8386 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8387 break; 8388 8389 default: 8390 /* unsupported! */ 8391 WARN_ON_ONCE(1); 8392 status = -EINVAL; 8393 goto out_impl_id; 8394 } 8395 if (xprt) { 8396 task_setup_data.rpc_xprt = xprt; 8397 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8398 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8399 sizeof(calldata->args.verifier.data)); 8400 } 8401 calldata->args.client = clp; 8402 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8403 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8404 #ifdef CONFIG_NFS_V4_1_MIGRATION 8405 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8406 #endif 8407 msg.rpc_argp = &calldata->args; 8408 msg.rpc_resp = &calldata->res; 8409 task_setup_data.callback_data = calldata; 8410 8411 return rpc_run_task(&task_setup_data); 8412 8413 out_impl_id: 8414 kfree(calldata->res.impl_id); 8415 out_server_scope: 8416 kfree(calldata->res.server_scope); 8417 out_server_owner: 8418 kfree(calldata->res.server_owner); 8419 out_calldata: 8420 kfree(calldata); 8421 out: 8422 nfs_put_client(clp); 8423 return ERR_PTR(status); 8424 } 8425 8426 /* 8427 * _nfs4_proc_exchange_id() 8428 * 8429 * Wrapper for EXCHANGE_ID operation. 8430 */ 8431 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8432 u32 sp4_how) 8433 { 8434 struct rpc_task *task; 8435 struct nfs41_exchange_id_args *argp; 8436 struct nfs41_exchange_id_res *resp; 8437 unsigned long now = jiffies; 8438 int status; 8439 8440 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8441 if (IS_ERR(task)) 8442 return PTR_ERR(task); 8443 8444 argp = task->tk_msg.rpc_argp; 8445 resp = task->tk_msg.rpc_resp; 8446 status = task->tk_status; 8447 if (status != 0) 8448 goto out; 8449 8450 status = nfs4_check_cl_exchange_flags(resp->flags); 8451 if (status != 0) 8452 goto out; 8453 8454 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8455 if (status != 0) 8456 goto out; 8457 8458 do_renew_lease(clp, now); 8459 8460 clp->cl_clientid = resp->clientid; 8461 clp->cl_exchange_flags = resp->flags; 8462 clp->cl_seqid = resp->seqid; 8463 /* Client ID is not confirmed */ 8464 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8465 clear_bit(NFS4_SESSION_ESTABLISHED, 8466 &clp->cl_session->session_state); 8467 8468 if (clp->cl_serverscope != NULL && 8469 !nfs41_same_server_scope(clp->cl_serverscope, 8470 resp->server_scope)) { 8471 dprintk("%s: server_scope mismatch detected\n", 8472 __func__); 8473 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8474 } 8475 8476 swap(clp->cl_serverowner, resp->server_owner); 8477 swap(clp->cl_serverscope, resp->server_scope); 8478 swap(clp->cl_implid, resp->impl_id); 8479 8480 /* Save the EXCHANGE_ID verifier session trunk tests */ 8481 memcpy(clp->cl_confirm.data, argp->verifier.data, 8482 sizeof(clp->cl_confirm.data)); 8483 out: 8484 trace_nfs4_exchange_id(clp, status); 8485 rpc_put_task(task); 8486 return status; 8487 } 8488 8489 /* 8490 * nfs4_proc_exchange_id() 8491 * 8492 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8493 * 8494 * Since the clientid has expired, all compounds using sessions 8495 * associated with the stale clientid will be returning 8496 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8497 * be in some phase of session reset. 8498 * 8499 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8500 */ 8501 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8502 { 8503 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8504 int status; 8505 8506 /* try SP4_MACH_CRED if krb5i/p */ 8507 if (authflavor == RPC_AUTH_GSS_KRB5I || 8508 authflavor == RPC_AUTH_GSS_KRB5P) { 8509 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8510 if (!status) 8511 return 0; 8512 } 8513 8514 /* try SP4_NONE */ 8515 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8516 } 8517 8518 /** 8519 * nfs4_test_session_trunk 8520 * 8521 * This is an add_xprt_test() test function called from 8522 * rpc_clnt_setup_test_and_add_xprt. 8523 * 8524 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8525 * and is dereferrenced in nfs4_exchange_id_release 8526 * 8527 * Upon success, add the new transport to the rpc_clnt 8528 * 8529 * @clnt: struct rpc_clnt to get new transport 8530 * @xprt: the rpc_xprt to test 8531 * @data: call data for _nfs4_proc_exchange_id. 8532 */ 8533 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8534 void *data) 8535 { 8536 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 8537 struct rpc_task *task; 8538 int status; 8539 8540 u32 sp4_how; 8541 8542 dprintk("--> %s try %s\n", __func__, 8543 xprt->address_strings[RPC_DISPLAY_ADDR]); 8544 8545 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8546 8547 /* Test connection for session trunking. Async exchange_id call */ 8548 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8549 if (IS_ERR(task)) 8550 return; 8551 8552 status = task->tk_status; 8553 if (status == 0) 8554 status = nfs4_detect_session_trunking(adata->clp, 8555 task->tk_msg.rpc_resp, xprt); 8556 8557 if (status == 0) 8558 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8559 8560 rpc_put_task(task); 8561 } 8562 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8563 8564 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8565 const struct cred *cred) 8566 { 8567 struct rpc_message msg = { 8568 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8569 .rpc_argp = clp, 8570 .rpc_cred = cred, 8571 }; 8572 int status; 8573 8574 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8575 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8576 trace_nfs4_destroy_clientid(clp, status); 8577 if (status) 8578 dprintk("NFS: Got error %d from the server %s on " 8579 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8580 return status; 8581 } 8582 8583 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8584 const struct cred *cred) 8585 { 8586 unsigned int loop; 8587 int ret; 8588 8589 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8590 ret = _nfs4_proc_destroy_clientid(clp, cred); 8591 switch (ret) { 8592 case -NFS4ERR_DELAY: 8593 case -NFS4ERR_CLIENTID_BUSY: 8594 ssleep(1); 8595 break; 8596 default: 8597 return ret; 8598 } 8599 } 8600 return 0; 8601 } 8602 8603 int nfs4_destroy_clientid(struct nfs_client *clp) 8604 { 8605 const struct cred *cred; 8606 int ret = 0; 8607 8608 if (clp->cl_mvops->minor_version < 1) 8609 goto out; 8610 if (clp->cl_exchange_flags == 0) 8611 goto out; 8612 if (clp->cl_preserve_clid) 8613 goto out; 8614 cred = nfs4_get_clid_cred(clp); 8615 ret = nfs4_proc_destroy_clientid(clp, cred); 8616 put_cred(cred); 8617 switch (ret) { 8618 case 0: 8619 case -NFS4ERR_STALE_CLIENTID: 8620 clp->cl_exchange_flags = 0; 8621 } 8622 out: 8623 return ret; 8624 } 8625 8626 #endif /* CONFIG_NFS_V4_1 */ 8627 8628 struct nfs4_get_lease_time_data { 8629 struct nfs4_get_lease_time_args *args; 8630 struct nfs4_get_lease_time_res *res; 8631 struct nfs_client *clp; 8632 }; 8633 8634 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 8635 void *calldata) 8636 { 8637 struct nfs4_get_lease_time_data *data = 8638 (struct nfs4_get_lease_time_data *)calldata; 8639 8640 dprintk("--> %s\n", __func__); 8641 /* just setup sequence, do not trigger session recovery 8642 since we're invoked within one */ 8643 nfs4_setup_sequence(data->clp, 8644 &data->args->la_seq_args, 8645 &data->res->lr_seq_res, 8646 task); 8647 dprintk("<-- %s\n", __func__); 8648 } 8649 8650 /* 8651 * Called from nfs4_state_manager thread for session setup, so don't recover 8652 * from sequence operation or clientid errors. 8653 */ 8654 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 8655 { 8656 struct nfs4_get_lease_time_data *data = 8657 (struct nfs4_get_lease_time_data *)calldata; 8658 8659 dprintk("--> %s\n", __func__); 8660 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 8661 return; 8662 switch (task->tk_status) { 8663 case -NFS4ERR_DELAY: 8664 case -NFS4ERR_GRACE: 8665 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 8666 rpc_delay(task, NFS4_POLL_RETRY_MIN); 8667 task->tk_status = 0; 8668 /* fall through */ 8669 case -NFS4ERR_RETRY_UNCACHED_REP: 8670 rpc_restart_call_prepare(task); 8671 return; 8672 } 8673 dprintk("<-- %s\n", __func__); 8674 } 8675 8676 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 8677 .rpc_call_prepare = nfs4_get_lease_time_prepare, 8678 .rpc_call_done = nfs4_get_lease_time_done, 8679 }; 8680 8681 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 8682 { 8683 struct nfs4_get_lease_time_args args; 8684 struct nfs4_get_lease_time_res res = { 8685 .lr_fsinfo = fsinfo, 8686 }; 8687 struct nfs4_get_lease_time_data data = { 8688 .args = &args, 8689 .res = &res, 8690 .clp = clp, 8691 }; 8692 struct rpc_message msg = { 8693 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 8694 .rpc_argp = &args, 8695 .rpc_resp = &res, 8696 }; 8697 struct rpc_task_setup task_setup = { 8698 .rpc_client = clp->cl_rpcclient, 8699 .rpc_message = &msg, 8700 .callback_ops = &nfs4_get_lease_time_ops, 8701 .callback_data = &data, 8702 .flags = RPC_TASK_TIMEOUT, 8703 }; 8704 8705 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 8706 return nfs4_call_sync_custom(&task_setup); 8707 } 8708 8709 #ifdef CONFIG_NFS_V4_1 8710 8711 /* 8712 * Initialize the values to be used by the client in CREATE_SESSION 8713 * If nfs4_init_session set the fore channel request and response sizes, 8714 * use them. 8715 * 8716 * Set the back channel max_resp_sz_cached to zero to force the client to 8717 * always set csa_cachethis to FALSE because the current implementation 8718 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 8719 */ 8720 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 8721 struct rpc_clnt *clnt) 8722 { 8723 unsigned int max_rqst_sz, max_resp_sz; 8724 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 8725 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 8726 8727 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 8728 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 8729 8730 /* Fore channel attributes */ 8731 args->fc_attrs.max_rqst_sz = max_rqst_sz; 8732 args->fc_attrs.max_resp_sz = max_resp_sz; 8733 args->fc_attrs.max_ops = NFS4_MAX_OPS; 8734 args->fc_attrs.max_reqs = max_session_slots; 8735 8736 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 8737 "max_ops=%u max_reqs=%u\n", 8738 __func__, 8739 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 8740 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 8741 8742 /* Back channel attributes */ 8743 args->bc_attrs.max_rqst_sz = max_bc_payload; 8744 args->bc_attrs.max_resp_sz = max_bc_payload; 8745 args->bc_attrs.max_resp_sz_cached = 0; 8746 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 8747 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 8748 if (args->bc_attrs.max_reqs > max_bc_slots) 8749 args->bc_attrs.max_reqs = max_bc_slots; 8750 8751 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 8752 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 8753 __func__, 8754 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 8755 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 8756 args->bc_attrs.max_reqs); 8757 } 8758 8759 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 8760 struct nfs41_create_session_res *res) 8761 { 8762 struct nfs4_channel_attrs *sent = &args->fc_attrs; 8763 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 8764 8765 if (rcvd->max_resp_sz > sent->max_resp_sz) 8766 return -EINVAL; 8767 /* 8768 * Our requested max_ops is the minimum we need; we're not 8769 * prepared to break up compounds into smaller pieces than that. 8770 * So, no point even trying to continue if the server won't 8771 * cooperate: 8772 */ 8773 if (rcvd->max_ops < sent->max_ops) 8774 return -EINVAL; 8775 if (rcvd->max_reqs == 0) 8776 return -EINVAL; 8777 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 8778 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 8779 return 0; 8780 } 8781 8782 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 8783 struct nfs41_create_session_res *res) 8784 { 8785 struct nfs4_channel_attrs *sent = &args->bc_attrs; 8786 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 8787 8788 if (!(res->flags & SESSION4_BACK_CHAN)) 8789 goto out; 8790 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 8791 return -EINVAL; 8792 if (rcvd->max_resp_sz < sent->max_resp_sz) 8793 return -EINVAL; 8794 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 8795 return -EINVAL; 8796 if (rcvd->max_ops > sent->max_ops) 8797 return -EINVAL; 8798 if (rcvd->max_reqs > sent->max_reqs) 8799 return -EINVAL; 8800 out: 8801 return 0; 8802 } 8803 8804 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 8805 struct nfs41_create_session_res *res) 8806 { 8807 int ret; 8808 8809 ret = nfs4_verify_fore_channel_attrs(args, res); 8810 if (ret) 8811 return ret; 8812 return nfs4_verify_back_channel_attrs(args, res); 8813 } 8814 8815 static void nfs4_update_session(struct nfs4_session *session, 8816 struct nfs41_create_session_res *res) 8817 { 8818 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 8819 /* Mark client id and session as being confirmed */ 8820 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 8821 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 8822 session->flags = res->flags; 8823 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 8824 if (res->flags & SESSION4_BACK_CHAN) 8825 memcpy(&session->bc_attrs, &res->bc_attrs, 8826 sizeof(session->bc_attrs)); 8827 } 8828 8829 static int _nfs4_proc_create_session(struct nfs_client *clp, 8830 const struct cred *cred) 8831 { 8832 struct nfs4_session *session = clp->cl_session; 8833 struct nfs41_create_session_args args = { 8834 .client = clp, 8835 .clientid = clp->cl_clientid, 8836 .seqid = clp->cl_seqid, 8837 .cb_program = NFS4_CALLBACK, 8838 }; 8839 struct nfs41_create_session_res res; 8840 8841 struct rpc_message msg = { 8842 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 8843 .rpc_argp = &args, 8844 .rpc_resp = &res, 8845 .rpc_cred = cred, 8846 }; 8847 int status; 8848 8849 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 8850 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 8851 8852 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 8853 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8854 trace_nfs4_create_session(clp, status); 8855 8856 switch (status) { 8857 case -NFS4ERR_STALE_CLIENTID: 8858 case -NFS4ERR_DELAY: 8859 case -ETIMEDOUT: 8860 case -EACCES: 8861 case -EAGAIN: 8862 goto out; 8863 } 8864 8865 clp->cl_seqid++; 8866 if (!status) { 8867 /* Verify the session's negotiated channel_attrs values */ 8868 status = nfs4_verify_channel_attrs(&args, &res); 8869 /* Increment the clientid slot sequence id */ 8870 if (status) 8871 goto out; 8872 nfs4_update_session(session, &res); 8873 } 8874 out: 8875 return status; 8876 } 8877 8878 /* 8879 * Issues a CREATE_SESSION operation to the server. 8880 * It is the responsibility of the caller to verify the session is 8881 * expired before calling this routine. 8882 */ 8883 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 8884 { 8885 int status; 8886 unsigned *ptr; 8887 struct nfs4_session *session = clp->cl_session; 8888 8889 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 8890 8891 status = _nfs4_proc_create_session(clp, cred); 8892 if (status) 8893 goto out; 8894 8895 /* Init or reset the session slot tables */ 8896 status = nfs4_setup_session_slot_tables(session); 8897 dprintk("slot table setup returned %d\n", status); 8898 if (status) 8899 goto out; 8900 8901 ptr = (unsigned *)&session->sess_id.data[0]; 8902 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 8903 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 8904 out: 8905 dprintk("<-- %s\n", __func__); 8906 return status; 8907 } 8908 8909 /* 8910 * Issue the over-the-wire RPC DESTROY_SESSION. 8911 * The caller must serialize access to this routine. 8912 */ 8913 int nfs4_proc_destroy_session(struct nfs4_session *session, 8914 const struct cred *cred) 8915 { 8916 struct rpc_message msg = { 8917 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 8918 .rpc_argp = session, 8919 .rpc_cred = cred, 8920 }; 8921 int status = 0; 8922 8923 dprintk("--> nfs4_proc_destroy_session\n"); 8924 8925 /* session is still being setup */ 8926 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 8927 return 0; 8928 8929 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 8930 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8931 trace_nfs4_destroy_session(session->clp, status); 8932 8933 if (status) 8934 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 8935 "Session has been destroyed regardless...\n", status); 8936 8937 dprintk("<-- nfs4_proc_destroy_session\n"); 8938 return status; 8939 } 8940 8941 /* 8942 * Renew the cl_session lease. 8943 */ 8944 struct nfs4_sequence_data { 8945 struct nfs_client *clp; 8946 struct nfs4_sequence_args args; 8947 struct nfs4_sequence_res res; 8948 }; 8949 8950 static void nfs41_sequence_release(void *data) 8951 { 8952 struct nfs4_sequence_data *calldata = data; 8953 struct nfs_client *clp = calldata->clp; 8954 8955 if (refcount_read(&clp->cl_count) > 1) 8956 nfs4_schedule_state_renewal(clp); 8957 nfs_put_client(clp); 8958 kfree(calldata); 8959 } 8960 8961 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8962 { 8963 switch(task->tk_status) { 8964 case -NFS4ERR_DELAY: 8965 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8966 return -EAGAIN; 8967 default: 8968 nfs4_schedule_lease_recovery(clp); 8969 } 8970 return 0; 8971 } 8972 8973 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 8974 { 8975 struct nfs4_sequence_data *calldata = data; 8976 struct nfs_client *clp = calldata->clp; 8977 8978 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 8979 return; 8980 8981 trace_nfs4_sequence(clp, task->tk_status); 8982 if (task->tk_status < 0) { 8983 dprintk("%s ERROR %d\n", __func__, task->tk_status); 8984 if (refcount_read(&clp->cl_count) == 1) 8985 goto out; 8986 8987 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 8988 rpc_restart_call_prepare(task); 8989 return; 8990 } 8991 } 8992 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 8993 out: 8994 dprintk("<-- %s\n", __func__); 8995 } 8996 8997 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 8998 { 8999 struct nfs4_sequence_data *calldata = data; 9000 struct nfs_client *clp = calldata->clp; 9001 struct nfs4_sequence_args *args; 9002 struct nfs4_sequence_res *res; 9003 9004 args = task->tk_msg.rpc_argp; 9005 res = task->tk_msg.rpc_resp; 9006 9007 nfs4_setup_sequence(clp, args, res, task); 9008 } 9009 9010 static const struct rpc_call_ops nfs41_sequence_ops = { 9011 .rpc_call_done = nfs41_sequence_call_done, 9012 .rpc_call_prepare = nfs41_sequence_prepare, 9013 .rpc_release = nfs41_sequence_release, 9014 }; 9015 9016 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9017 const struct cred *cred, 9018 struct nfs4_slot *slot, 9019 bool is_privileged) 9020 { 9021 struct nfs4_sequence_data *calldata; 9022 struct rpc_message msg = { 9023 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9024 .rpc_cred = cred, 9025 }; 9026 struct rpc_task_setup task_setup_data = { 9027 .rpc_client = clp->cl_rpcclient, 9028 .rpc_message = &msg, 9029 .callback_ops = &nfs41_sequence_ops, 9030 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 9031 }; 9032 struct rpc_task *ret; 9033 9034 ret = ERR_PTR(-EIO); 9035 if (!refcount_inc_not_zero(&clp->cl_count)) 9036 goto out_err; 9037 9038 ret = ERR_PTR(-ENOMEM); 9039 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9040 if (calldata == NULL) 9041 goto out_put_clp; 9042 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9043 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9044 msg.rpc_argp = &calldata->args; 9045 msg.rpc_resp = &calldata->res; 9046 calldata->clp = clp; 9047 task_setup_data.callback_data = calldata; 9048 9049 ret = rpc_run_task(&task_setup_data); 9050 if (IS_ERR(ret)) 9051 goto out_err; 9052 return ret; 9053 out_put_clp: 9054 nfs_put_client(clp); 9055 out_err: 9056 nfs41_release_slot(slot); 9057 return ret; 9058 } 9059 9060 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9061 { 9062 struct rpc_task *task; 9063 int ret = 0; 9064 9065 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9066 return -EAGAIN; 9067 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9068 if (IS_ERR(task)) 9069 ret = PTR_ERR(task); 9070 else 9071 rpc_put_task_async(task); 9072 dprintk("<-- %s status=%d\n", __func__, ret); 9073 return ret; 9074 } 9075 9076 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9077 { 9078 struct rpc_task *task; 9079 int ret; 9080 9081 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9082 if (IS_ERR(task)) { 9083 ret = PTR_ERR(task); 9084 goto out; 9085 } 9086 ret = rpc_wait_for_completion_task(task); 9087 if (!ret) 9088 ret = task->tk_status; 9089 rpc_put_task(task); 9090 out: 9091 dprintk("<-- %s status=%d\n", __func__, ret); 9092 return ret; 9093 } 9094 9095 struct nfs4_reclaim_complete_data { 9096 struct nfs_client *clp; 9097 struct nfs41_reclaim_complete_args arg; 9098 struct nfs41_reclaim_complete_res res; 9099 }; 9100 9101 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9102 { 9103 struct nfs4_reclaim_complete_data *calldata = data; 9104 9105 nfs4_setup_sequence(calldata->clp, 9106 &calldata->arg.seq_args, 9107 &calldata->res.seq_res, 9108 task); 9109 } 9110 9111 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9112 { 9113 switch(task->tk_status) { 9114 case 0: 9115 wake_up_all(&clp->cl_lock_waitq); 9116 /* Fallthrough */ 9117 case -NFS4ERR_COMPLETE_ALREADY: 9118 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9119 break; 9120 case -NFS4ERR_DELAY: 9121 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9122 /* fall through */ 9123 case -NFS4ERR_RETRY_UNCACHED_REP: 9124 return -EAGAIN; 9125 case -NFS4ERR_BADSESSION: 9126 case -NFS4ERR_DEADSESSION: 9127 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9128 break; 9129 default: 9130 nfs4_schedule_lease_recovery(clp); 9131 } 9132 return 0; 9133 } 9134 9135 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9136 { 9137 struct nfs4_reclaim_complete_data *calldata = data; 9138 struct nfs_client *clp = calldata->clp; 9139 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9140 9141 dprintk("--> %s\n", __func__); 9142 if (!nfs41_sequence_done(task, res)) 9143 return; 9144 9145 trace_nfs4_reclaim_complete(clp, task->tk_status); 9146 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9147 rpc_restart_call_prepare(task); 9148 return; 9149 } 9150 dprintk("<-- %s\n", __func__); 9151 } 9152 9153 static void nfs4_free_reclaim_complete_data(void *data) 9154 { 9155 struct nfs4_reclaim_complete_data *calldata = data; 9156 9157 kfree(calldata); 9158 } 9159 9160 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9161 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9162 .rpc_call_done = nfs4_reclaim_complete_done, 9163 .rpc_release = nfs4_free_reclaim_complete_data, 9164 }; 9165 9166 /* 9167 * Issue a global reclaim complete. 9168 */ 9169 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9170 const struct cred *cred) 9171 { 9172 struct nfs4_reclaim_complete_data *calldata; 9173 struct rpc_message msg = { 9174 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9175 .rpc_cred = cred, 9176 }; 9177 struct rpc_task_setup task_setup_data = { 9178 .rpc_client = clp->cl_rpcclient, 9179 .rpc_message = &msg, 9180 .callback_ops = &nfs4_reclaim_complete_call_ops, 9181 .flags = RPC_TASK_NO_ROUND_ROBIN, 9182 }; 9183 int status = -ENOMEM; 9184 9185 dprintk("--> %s\n", __func__); 9186 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9187 if (calldata == NULL) 9188 goto out; 9189 calldata->clp = clp; 9190 calldata->arg.one_fs = 0; 9191 9192 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9193 msg.rpc_argp = &calldata->arg; 9194 msg.rpc_resp = &calldata->res; 9195 task_setup_data.callback_data = calldata; 9196 status = nfs4_call_sync_custom(&task_setup_data); 9197 out: 9198 dprintk("<-- %s status=%d\n", __func__, status); 9199 return status; 9200 } 9201 9202 static void 9203 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9204 { 9205 struct nfs4_layoutget *lgp = calldata; 9206 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9207 9208 dprintk("--> %s\n", __func__); 9209 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9210 &lgp->res.seq_res, task); 9211 dprintk("<-- %s\n", __func__); 9212 } 9213 9214 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9215 { 9216 struct nfs4_layoutget *lgp = calldata; 9217 9218 dprintk("--> %s\n", __func__); 9219 nfs41_sequence_process(task, &lgp->res.seq_res); 9220 dprintk("<-- %s\n", __func__); 9221 } 9222 9223 static int 9224 nfs4_layoutget_handle_exception(struct rpc_task *task, 9225 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9226 { 9227 struct inode *inode = lgp->args.inode; 9228 struct nfs_server *server = NFS_SERVER(inode); 9229 struct pnfs_layout_hdr *lo; 9230 int nfs4err = task->tk_status; 9231 int err, status = 0; 9232 LIST_HEAD(head); 9233 9234 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9235 9236 nfs4_sequence_free_slot(&lgp->res.seq_res); 9237 9238 switch (nfs4err) { 9239 case 0: 9240 goto out; 9241 9242 /* 9243 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9244 * on the file. set tk_status to -ENODATA to tell upper layer to 9245 * retry go inband. 9246 */ 9247 case -NFS4ERR_LAYOUTUNAVAILABLE: 9248 status = -ENODATA; 9249 goto out; 9250 /* 9251 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9252 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9253 */ 9254 case -NFS4ERR_BADLAYOUT: 9255 status = -EOVERFLOW; 9256 goto out; 9257 /* 9258 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9259 * (or clients) writing to the same RAID stripe except when 9260 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9261 * 9262 * Treat it like we would RECALLCONFLICT -- we retry for a little 9263 * while, and then eventually give up. 9264 */ 9265 case -NFS4ERR_LAYOUTTRYLATER: 9266 if (lgp->args.minlength == 0) { 9267 status = -EOVERFLOW; 9268 goto out; 9269 } 9270 status = -EBUSY; 9271 break; 9272 case -NFS4ERR_RECALLCONFLICT: 9273 status = -ERECALLCONFLICT; 9274 break; 9275 case -NFS4ERR_DELEG_REVOKED: 9276 case -NFS4ERR_ADMIN_REVOKED: 9277 case -NFS4ERR_EXPIRED: 9278 case -NFS4ERR_BAD_STATEID: 9279 exception->timeout = 0; 9280 spin_lock(&inode->i_lock); 9281 lo = NFS_I(inode)->layout; 9282 /* If the open stateid was bad, then recover it. */ 9283 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9284 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9285 spin_unlock(&inode->i_lock); 9286 exception->state = lgp->args.ctx->state; 9287 exception->stateid = &lgp->args.stateid; 9288 break; 9289 } 9290 9291 /* 9292 * Mark the bad layout state as invalid, then retry 9293 */ 9294 pnfs_mark_layout_stateid_invalid(lo, &head); 9295 spin_unlock(&inode->i_lock); 9296 nfs_commit_inode(inode, 0); 9297 pnfs_free_lseg_list(&head); 9298 status = -EAGAIN; 9299 goto out; 9300 } 9301 9302 err = nfs4_handle_exception(server, nfs4err, exception); 9303 if (!status) { 9304 if (exception->retry) 9305 status = -EAGAIN; 9306 else 9307 status = err; 9308 } 9309 out: 9310 dprintk("<-- %s\n", __func__); 9311 return status; 9312 } 9313 9314 size_t max_response_pages(struct nfs_server *server) 9315 { 9316 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9317 return nfs_page_array_len(0, max_resp_sz); 9318 } 9319 9320 static void nfs4_layoutget_release(void *calldata) 9321 { 9322 struct nfs4_layoutget *lgp = calldata; 9323 9324 dprintk("--> %s\n", __func__); 9325 nfs4_sequence_free_slot(&lgp->res.seq_res); 9326 pnfs_layoutget_free(lgp); 9327 dprintk("<-- %s\n", __func__); 9328 } 9329 9330 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9331 .rpc_call_prepare = nfs4_layoutget_prepare, 9332 .rpc_call_done = nfs4_layoutget_done, 9333 .rpc_release = nfs4_layoutget_release, 9334 }; 9335 9336 struct pnfs_layout_segment * 9337 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9338 { 9339 struct inode *inode = lgp->args.inode; 9340 struct nfs_server *server = NFS_SERVER(inode); 9341 struct rpc_task *task; 9342 struct rpc_message msg = { 9343 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9344 .rpc_argp = &lgp->args, 9345 .rpc_resp = &lgp->res, 9346 .rpc_cred = lgp->cred, 9347 }; 9348 struct rpc_task_setup task_setup_data = { 9349 .rpc_client = server->client, 9350 .rpc_message = &msg, 9351 .callback_ops = &nfs4_layoutget_call_ops, 9352 .callback_data = lgp, 9353 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 9354 }; 9355 struct pnfs_layout_segment *lseg = NULL; 9356 struct nfs4_exception exception = { 9357 .inode = inode, 9358 .timeout = *timeout, 9359 }; 9360 int status = 0; 9361 9362 dprintk("--> %s\n", __func__); 9363 9364 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 9365 pnfs_get_layout_hdr(NFS_I(inode)->layout); 9366 9367 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9368 9369 task = rpc_run_task(&task_setup_data); 9370 9371 status = rpc_wait_for_completion_task(task); 9372 if (status != 0) 9373 goto out; 9374 9375 if (task->tk_status < 0) { 9376 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9377 *timeout = exception.timeout; 9378 } else if (lgp->res.layoutp->len == 0) { 9379 status = -EAGAIN; 9380 *timeout = nfs4_update_delay(&exception.timeout); 9381 } else 9382 lseg = pnfs_layout_process(lgp); 9383 out: 9384 trace_nfs4_layoutget(lgp->args.ctx, 9385 &lgp->args.range, 9386 &lgp->res.range, 9387 &lgp->res.stateid, 9388 status); 9389 9390 rpc_put_task(task); 9391 dprintk("<-- %s status=%d\n", __func__, status); 9392 if (status) 9393 return ERR_PTR(status); 9394 return lseg; 9395 } 9396 9397 static void 9398 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9399 { 9400 struct nfs4_layoutreturn *lrp = calldata; 9401 9402 dprintk("--> %s\n", __func__); 9403 nfs4_setup_sequence(lrp->clp, 9404 &lrp->args.seq_args, 9405 &lrp->res.seq_res, 9406 task); 9407 if (!pnfs_layout_is_valid(lrp->args.layout)) 9408 rpc_exit(task, 0); 9409 } 9410 9411 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9412 { 9413 struct nfs4_layoutreturn *lrp = calldata; 9414 struct nfs_server *server; 9415 9416 dprintk("--> %s\n", __func__); 9417 9418 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9419 return; 9420 9421 /* 9422 * Was there an RPC level error? Assume the call succeeded, 9423 * and that we need to release the layout 9424 */ 9425 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9426 lrp->res.lrs_present = 0; 9427 return; 9428 } 9429 9430 server = NFS_SERVER(lrp->args.inode); 9431 switch (task->tk_status) { 9432 case -NFS4ERR_OLD_STATEID: 9433 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9434 &lrp->args.range, 9435 lrp->args.inode)) 9436 goto out_restart; 9437 /* Fallthrough */ 9438 default: 9439 task->tk_status = 0; 9440 /* Fallthrough */ 9441 case 0: 9442 break; 9443 case -NFS4ERR_DELAY: 9444 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9445 break; 9446 goto out_restart; 9447 } 9448 dprintk("<-- %s\n", __func__); 9449 return; 9450 out_restart: 9451 task->tk_status = 0; 9452 nfs4_sequence_free_slot(&lrp->res.seq_res); 9453 rpc_restart_call_prepare(task); 9454 } 9455 9456 static void nfs4_layoutreturn_release(void *calldata) 9457 { 9458 struct nfs4_layoutreturn *lrp = calldata; 9459 struct pnfs_layout_hdr *lo = lrp->args.layout; 9460 9461 dprintk("--> %s\n", __func__); 9462 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9463 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9464 nfs4_sequence_free_slot(&lrp->res.seq_res); 9465 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9466 lrp->ld_private.ops->free(&lrp->ld_private); 9467 pnfs_put_layout_hdr(lrp->args.layout); 9468 nfs_iput_and_deactive(lrp->inode); 9469 put_cred(lrp->cred); 9470 kfree(calldata); 9471 dprintk("<-- %s\n", __func__); 9472 } 9473 9474 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9475 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9476 .rpc_call_done = nfs4_layoutreturn_done, 9477 .rpc_release = nfs4_layoutreturn_release, 9478 }; 9479 9480 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9481 { 9482 struct rpc_task *task; 9483 struct rpc_message msg = { 9484 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9485 .rpc_argp = &lrp->args, 9486 .rpc_resp = &lrp->res, 9487 .rpc_cred = lrp->cred, 9488 }; 9489 struct rpc_task_setup task_setup_data = { 9490 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9491 .rpc_message = &msg, 9492 .callback_ops = &nfs4_layoutreturn_call_ops, 9493 .callback_data = lrp, 9494 }; 9495 int status = 0; 9496 9497 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9498 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9499 &task_setup_data.rpc_client, &msg); 9500 9501 dprintk("--> %s\n", __func__); 9502 if (!sync) { 9503 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9504 if (!lrp->inode) { 9505 nfs4_layoutreturn_release(lrp); 9506 return -EAGAIN; 9507 } 9508 task_setup_data.flags |= RPC_TASK_ASYNC; 9509 } 9510 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0); 9511 task = rpc_run_task(&task_setup_data); 9512 if (IS_ERR(task)) 9513 return PTR_ERR(task); 9514 if (sync) 9515 status = task->tk_status; 9516 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9517 dprintk("<-- %s status=%d\n", __func__, status); 9518 rpc_put_task(task); 9519 return status; 9520 } 9521 9522 static int 9523 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9524 struct pnfs_device *pdev, 9525 const struct cred *cred) 9526 { 9527 struct nfs4_getdeviceinfo_args args = { 9528 .pdev = pdev, 9529 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9530 NOTIFY_DEVICEID4_DELETE, 9531 }; 9532 struct nfs4_getdeviceinfo_res res = { 9533 .pdev = pdev, 9534 }; 9535 struct rpc_message msg = { 9536 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9537 .rpc_argp = &args, 9538 .rpc_resp = &res, 9539 .rpc_cred = cred, 9540 }; 9541 int status; 9542 9543 dprintk("--> %s\n", __func__); 9544 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9545 if (res.notification & ~args.notify_types) 9546 dprintk("%s: unsupported notification\n", __func__); 9547 if (res.notification != args.notify_types) 9548 pdev->nocache = 1; 9549 9550 dprintk("<-- %s status=%d\n", __func__, status); 9551 9552 return status; 9553 } 9554 9555 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9556 struct pnfs_device *pdev, 9557 const struct cred *cred) 9558 { 9559 struct nfs4_exception exception = { }; 9560 int err; 9561 9562 do { 9563 err = nfs4_handle_exception(server, 9564 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9565 &exception); 9566 } while (exception.retry); 9567 return err; 9568 } 9569 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9570 9571 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9572 { 9573 struct nfs4_layoutcommit_data *data = calldata; 9574 struct nfs_server *server = NFS_SERVER(data->args.inode); 9575 9576 nfs4_setup_sequence(server->nfs_client, 9577 &data->args.seq_args, 9578 &data->res.seq_res, 9579 task); 9580 } 9581 9582 static void 9583 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9584 { 9585 struct nfs4_layoutcommit_data *data = calldata; 9586 struct nfs_server *server = NFS_SERVER(data->args.inode); 9587 9588 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9589 return; 9590 9591 switch (task->tk_status) { /* Just ignore these failures */ 9592 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9593 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9594 case -NFS4ERR_BADLAYOUT: /* no layout */ 9595 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9596 task->tk_status = 0; 9597 case 0: 9598 break; 9599 default: 9600 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9601 rpc_restart_call_prepare(task); 9602 return; 9603 } 9604 } 9605 } 9606 9607 static void nfs4_layoutcommit_release(void *calldata) 9608 { 9609 struct nfs4_layoutcommit_data *data = calldata; 9610 9611 pnfs_cleanup_layoutcommit(data); 9612 nfs_post_op_update_inode_force_wcc(data->args.inode, 9613 data->res.fattr); 9614 put_cred(data->cred); 9615 nfs_iput_and_deactive(data->inode); 9616 kfree(data); 9617 } 9618 9619 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9620 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9621 .rpc_call_done = nfs4_layoutcommit_done, 9622 .rpc_release = nfs4_layoutcommit_release, 9623 }; 9624 9625 int 9626 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9627 { 9628 struct rpc_message msg = { 9629 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9630 .rpc_argp = &data->args, 9631 .rpc_resp = &data->res, 9632 .rpc_cred = data->cred, 9633 }; 9634 struct rpc_task_setup task_setup_data = { 9635 .task = &data->task, 9636 .rpc_client = NFS_CLIENT(data->args.inode), 9637 .rpc_message = &msg, 9638 .callback_ops = &nfs4_layoutcommit_ops, 9639 .callback_data = data, 9640 }; 9641 struct rpc_task *task; 9642 int status = 0; 9643 9644 dprintk("NFS: initiating layoutcommit call. sync %d " 9645 "lbw: %llu inode %lu\n", sync, 9646 data->args.lastbytewritten, 9647 data->args.inode->i_ino); 9648 9649 if (!sync) { 9650 data->inode = nfs_igrab_and_active(data->args.inode); 9651 if (data->inode == NULL) { 9652 nfs4_layoutcommit_release(data); 9653 return -EAGAIN; 9654 } 9655 task_setup_data.flags = RPC_TASK_ASYNC; 9656 } 9657 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 9658 task = rpc_run_task(&task_setup_data); 9659 if (IS_ERR(task)) 9660 return PTR_ERR(task); 9661 if (sync) 9662 status = task->tk_status; 9663 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 9664 dprintk("%s: status %d\n", __func__, status); 9665 rpc_put_task(task); 9666 return status; 9667 } 9668 9669 /* 9670 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 9671 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 9672 */ 9673 static int 9674 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9675 struct nfs_fsinfo *info, 9676 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 9677 { 9678 struct nfs41_secinfo_no_name_args args = { 9679 .style = SECINFO_STYLE_CURRENT_FH, 9680 }; 9681 struct nfs4_secinfo_res res = { 9682 .flavors = flavors, 9683 }; 9684 struct rpc_message msg = { 9685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 9686 .rpc_argp = &args, 9687 .rpc_resp = &res, 9688 }; 9689 struct rpc_clnt *clnt = server->client; 9690 struct nfs4_call_sync_data data = { 9691 .seq_server = server, 9692 .seq_args = &args.seq_args, 9693 .seq_res = &res.seq_res, 9694 }; 9695 struct rpc_task_setup task_setup = { 9696 .rpc_client = server->client, 9697 .rpc_message = &msg, 9698 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 9699 .callback_data = &data, 9700 .flags = RPC_TASK_NO_ROUND_ROBIN, 9701 }; 9702 const struct cred *cred = NULL; 9703 int status; 9704 9705 if (use_integrity) { 9706 clnt = server->nfs_client->cl_rpcclient; 9707 task_setup.rpc_client = clnt; 9708 9709 cred = nfs4_get_clid_cred(server->nfs_client); 9710 msg.rpc_cred = cred; 9711 } 9712 9713 dprintk("--> %s\n", __func__); 9714 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 9715 status = nfs4_call_sync_custom(&task_setup); 9716 dprintk("<-- %s status=%d\n", __func__, status); 9717 9718 put_cred(cred); 9719 9720 return status; 9721 } 9722 9723 static int 9724 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9725 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 9726 { 9727 struct nfs4_exception exception = { 9728 .interruptible = true, 9729 }; 9730 int err; 9731 do { 9732 /* first try using integrity protection */ 9733 err = -NFS4ERR_WRONGSEC; 9734 9735 /* try to use integrity protection with machine cred */ 9736 if (_nfs4_is_integrity_protected(server->nfs_client)) 9737 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9738 flavors, true); 9739 9740 /* 9741 * if unable to use integrity protection, or SECINFO with 9742 * integrity protection returns NFS4ERR_WRONGSEC (which is 9743 * disallowed by spec, but exists in deployed servers) use 9744 * the current filesystem's rpc_client and the user cred. 9745 */ 9746 if (err == -NFS4ERR_WRONGSEC) 9747 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9748 flavors, false); 9749 9750 switch (err) { 9751 case 0: 9752 case -NFS4ERR_WRONGSEC: 9753 case -ENOTSUPP: 9754 goto out; 9755 default: 9756 err = nfs4_handle_exception(server, err, &exception); 9757 } 9758 } while (exception.retry); 9759 out: 9760 return err; 9761 } 9762 9763 static int 9764 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 9765 struct nfs_fsinfo *info) 9766 { 9767 int err; 9768 struct page *page; 9769 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 9770 struct nfs4_secinfo_flavors *flavors; 9771 struct nfs4_secinfo4 *secinfo; 9772 int i; 9773 9774 page = alloc_page(GFP_KERNEL); 9775 if (!page) { 9776 err = -ENOMEM; 9777 goto out; 9778 } 9779 9780 flavors = page_address(page); 9781 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 9782 9783 /* 9784 * Fall back on "guess and check" method if 9785 * the server doesn't support SECINFO_NO_NAME 9786 */ 9787 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 9788 err = nfs4_find_root_sec(server, fhandle, info); 9789 goto out_freepage; 9790 } 9791 if (err) 9792 goto out_freepage; 9793 9794 for (i = 0; i < flavors->num_flavors; i++) { 9795 secinfo = &flavors->flavors[i]; 9796 9797 switch (secinfo->flavor) { 9798 case RPC_AUTH_NULL: 9799 case RPC_AUTH_UNIX: 9800 case RPC_AUTH_GSS: 9801 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 9802 &secinfo->flavor_info); 9803 break; 9804 default: 9805 flavor = RPC_AUTH_MAXFLAVOR; 9806 break; 9807 } 9808 9809 if (!nfs_auth_info_match(&server->auth_info, flavor)) 9810 flavor = RPC_AUTH_MAXFLAVOR; 9811 9812 if (flavor != RPC_AUTH_MAXFLAVOR) { 9813 err = nfs4_lookup_root_sec(server, fhandle, 9814 info, flavor); 9815 if (!err) 9816 break; 9817 } 9818 } 9819 9820 if (flavor == RPC_AUTH_MAXFLAVOR) 9821 err = -EPERM; 9822 9823 out_freepage: 9824 put_page(page); 9825 if (err == -EACCES) 9826 return -EPERM; 9827 out: 9828 return err; 9829 } 9830 9831 static int _nfs41_test_stateid(struct nfs_server *server, 9832 nfs4_stateid *stateid, 9833 const struct cred *cred) 9834 { 9835 int status; 9836 struct nfs41_test_stateid_args args = { 9837 .stateid = stateid, 9838 }; 9839 struct nfs41_test_stateid_res res; 9840 struct rpc_message msg = { 9841 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 9842 .rpc_argp = &args, 9843 .rpc_resp = &res, 9844 .rpc_cred = cred, 9845 }; 9846 struct rpc_clnt *rpc_client = server->client; 9847 9848 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9849 &rpc_client, &msg); 9850 9851 dprintk("NFS call test_stateid %p\n", stateid); 9852 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 9853 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 9854 &args.seq_args, &res.seq_res); 9855 if (status != NFS_OK) { 9856 dprintk("NFS reply test_stateid: failed, %d\n", status); 9857 return status; 9858 } 9859 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 9860 return -res.status; 9861 } 9862 9863 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 9864 int err, struct nfs4_exception *exception) 9865 { 9866 exception->retry = 0; 9867 switch(err) { 9868 case -NFS4ERR_DELAY: 9869 case -NFS4ERR_RETRY_UNCACHED_REP: 9870 nfs4_handle_exception(server, err, exception); 9871 break; 9872 case -NFS4ERR_BADSESSION: 9873 case -NFS4ERR_BADSLOT: 9874 case -NFS4ERR_BAD_HIGH_SLOT: 9875 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9876 case -NFS4ERR_DEADSESSION: 9877 nfs4_do_handle_exception(server, err, exception); 9878 } 9879 } 9880 9881 /** 9882 * nfs41_test_stateid - perform a TEST_STATEID operation 9883 * 9884 * @server: server / transport on which to perform the operation 9885 * @stateid: state ID to test 9886 * @cred: credential 9887 * 9888 * Returns NFS_OK if the server recognizes that "stateid" is valid. 9889 * Otherwise a negative NFS4ERR value is returned if the operation 9890 * failed or the state ID is not currently valid. 9891 */ 9892 static int nfs41_test_stateid(struct nfs_server *server, 9893 nfs4_stateid *stateid, 9894 const struct cred *cred) 9895 { 9896 struct nfs4_exception exception = { 9897 .interruptible = true, 9898 }; 9899 int err; 9900 do { 9901 err = _nfs41_test_stateid(server, stateid, cred); 9902 nfs4_handle_delay_or_session_error(server, err, &exception); 9903 } while (exception.retry); 9904 return err; 9905 } 9906 9907 struct nfs_free_stateid_data { 9908 struct nfs_server *server; 9909 struct nfs41_free_stateid_args args; 9910 struct nfs41_free_stateid_res res; 9911 }; 9912 9913 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 9914 { 9915 struct nfs_free_stateid_data *data = calldata; 9916 nfs4_setup_sequence(data->server->nfs_client, 9917 &data->args.seq_args, 9918 &data->res.seq_res, 9919 task); 9920 } 9921 9922 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 9923 { 9924 struct nfs_free_stateid_data *data = calldata; 9925 9926 nfs41_sequence_done(task, &data->res.seq_res); 9927 9928 switch (task->tk_status) { 9929 case -NFS4ERR_DELAY: 9930 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 9931 rpc_restart_call_prepare(task); 9932 } 9933 } 9934 9935 static void nfs41_free_stateid_release(void *calldata) 9936 { 9937 kfree(calldata); 9938 } 9939 9940 static const struct rpc_call_ops nfs41_free_stateid_ops = { 9941 .rpc_call_prepare = nfs41_free_stateid_prepare, 9942 .rpc_call_done = nfs41_free_stateid_done, 9943 .rpc_release = nfs41_free_stateid_release, 9944 }; 9945 9946 /** 9947 * nfs41_free_stateid - perform a FREE_STATEID operation 9948 * 9949 * @server: server / transport on which to perform the operation 9950 * @stateid: state ID to release 9951 * @cred: credential 9952 * @privileged: set to true if this call needs to be privileged 9953 * 9954 * Note: this function is always asynchronous. 9955 */ 9956 static int nfs41_free_stateid(struct nfs_server *server, 9957 const nfs4_stateid *stateid, 9958 const struct cred *cred, 9959 bool privileged) 9960 { 9961 struct rpc_message msg = { 9962 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 9963 .rpc_cred = cred, 9964 }; 9965 struct rpc_task_setup task_setup = { 9966 .rpc_client = server->client, 9967 .rpc_message = &msg, 9968 .callback_ops = &nfs41_free_stateid_ops, 9969 .flags = RPC_TASK_ASYNC, 9970 }; 9971 struct nfs_free_stateid_data *data; 9972 struct rpc_task *task; 9973 9974 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9975 &task_setup.rpc_client, &msg); 9976 9977 dprintk("NFS call free_stateid %p\n", stateid); 9978 data = kmalloc(sizeof(*data), GFP_NOFS); 9979 if (!data) 9980 return -ENOMEM; 9981 data->server = server; 9982 nfs4_stateid_copy(&data->args.stateid, stateid); 9983 9984 task_setup.callback_data = data; 9985 9986 msg.rpc_argp = &data->args; 9987 msg.rpc_resp = &data->res; 9988 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 9989 task = rpc_run_task(&task_setup); 9990 if (IS_ERR(task)) 9991 return PTR_ERR(task); 9992 rpc_put_task(task); 9993 return 0; 9994 } 9995 9996 static void 9997 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 9998 { 9999 const struct cred *cred = lsp->ls_state->owner->so_cred; 10000 10001 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10002 nfs4_free_lock_state(server, lsp); 10003 } 10004 10005 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10006 const nfs4_stateid *s2) 10007 { 10008 if (s1->type != s2->type) 10009 return false; 10010 10011 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10012 return false; 10013 10014 if (s1->seqid == s2->seqid) 10015 return true; 10016 10017 return s1->seqid == 0 || s2->seqid == 0; 10018 } 10019 10020 #endif /* CONFIG_NFS_V4_1 */ 10021 10022 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10023 const nfs4_stateid *s2) 10024 { 10025 return nfs4_stateid_match(s1, s2); 10026 } 10027 10028 10029 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10030 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10031 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10032 .recover_open = nfs4_open_reclaim, 10033 .recover_lock = nfs4_lock_reclaim, 10034 .establish_clid = nfs4_init_clientid, 10035 .detect_trunking = nfs40_discover_server_trunking, 10036 }; 10037 10038 #if defined(CONFIG_NFS_V4_1) 10039 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10040 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10041 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10042 .recover_open = nfs4_open_reclaim, 10043 .recover_lock = nfs4_lock_reclaim, 10044 .establish_clid = nfs41_init_clientid, 10045 .reclaim_complete = nfs41_proc_reclaim_complete, 10046 .detect_trunking = nfs41_discover_server_trunking, 10047 }; 10048 #endif /* CONFIG_NFS_V4_1 */ 10049 10050 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10051 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10052 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10053 .recover_open = nfs40_open_expired, 10054 .recover_lock = nfs4_lock_expired, 10055 .establish_clid = nfs4_init_clientid, 10056 }; 10057 10058 #if defined(CONFIG_NFS_V4_1) 10059 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10060 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10061 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10062 .recover_open = nfs41_open_expired, 10063 .recover_lock = nfs41_lock_expired, 10064 .establish_clid = nfs41_init_clientid, 10065 }; 10066 #endif /* CONFIG_NFS_V4_1 */ 10067 10068 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10069 .sched_state_renewal = nfs4_proc_async_renew, 10070 .get_state_renewal_cred = nfs4_get_renew_cred, 10071 .renew_lease = nfs4_proc_renew, 10072 }; 10073 10074 #if defined(CONFIG_NFS_V4_1) 10075 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10076 .sched_state_renewal = nfs41_proc_async_sequence, 10077 .get_state_renewal_cred = nfs4_get_machine_cred, 10078 .renew_lease = nfs4_proc_sequence, 10079 }; 10080 #endif 10081 10082 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10083 .get_locations = _nfs40_proc_get_locations, 10084 .fsid_present = _nfs40_proc_fsid_present, 10085 }; 10086 10087 #if defined(CONFIG_NFS_V4_1) 10088 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10089 .get_locations = _nfs41_proc_get_locations, 10090 .fsid_present = _nfs41_proc_fsid_present, 10091 }; 10092 #endif /* CONFIG_NFS_V4_1 */ 10093 10094 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10095 .minor_version = 0, 10096 .init_caps = NFS_CAP_READDIRPLUS 10097 | NFS_CAP_ATOMIC_OPEN 10098 | NFS_CAP_POSIX_LOCK, 10099 .init_client = nfs40_init_client, 10100 .shutdown_client = nfs40_shutdown_client, 10101 .match_stateid = nfs4_match_stateid, 10102 .find_root_sec = nfs4_find_root_sec, 10103 .free_lock_state = nfs4_release_lockowner, 10104 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10105 .alloc_seqid = nfs_alloc_seqid, 10106 .call_sync_ops = &nfs40_call_sync_ops, 10107 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10108 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10109 .state_renewal_ops = &nfs40_state_renewal_ops, 10110 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10111 }; 10112 10113 #if defined(CONFIG_NFS_V4_1) 10114 static struct nfs_seqid * 10115 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10116 { 10117 return NULL; 10118 } 10119 10120 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10121 .minor_version = 1, 10122 .init_caps = NFS_CAP_READDIRPLUS 10123 | NFS_CAP_ATOMIC_OPEN 10124 | NFS_CAP_POSIX_LOCK 10125 | NFS_CAP_STATEID_NFSV41 10126 | NFS_CAP_ATOMIC_OPEN_V1 10127 | NFS_CAP_LGOPEN, 10128 .init_client = nfs41_init_client, 10129 .shutdown_client = nfs41_shutdown_client, 10130 .match_stateid = nfs41_match_stateid, 10131 .find_root_sec = nfs41_find_root_sec, 10132 .free_lock_state = nfs41_free_lock_state, 10133 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10134 .alloc_seqid = nfs_alloc_no_seqid, 10135 .session_trunk = nfs4_test_session_trunk, 10136 .call_sync_ops = &nfs41_call_sync_ops, 10137 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10138 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10139 .state_renewal_ops = &nfs41_state_renewal_ops, 10140 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10141 }; 10142 #endif 10143 10144 #if defined(CONFIG_NFS_V4_2) 10145 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10146 .minor_version = 2, 10147 .init_caps = NFS_CAP_READDIRPLUS 10148 | NFS_CAP_ATOMIC_OPEN 10149 | NFS_CAP_POSIX_LOCK 10150 | NFS_CAP_STATEID_NFSV41 10151 | NFS_CAP_ATOMIC_OPEN_V1 10152 | NFS_CAP_LGOPEN 10153 | NFS_CAP_ALLOCATE 10154 | NFS_CAP_COPY 10155 | NFS_CAP_OFFLOAD_CANCEL 10156 | NFS_CAP_COPY_NOTIFY 10157 | NFS_CAP_DEALLOCATE 10158 | NFS_CAP_SEEK 10159 | NFS_CAP_LAYOUTSTATS 10160 | NFS_CAP_CLONE 10161 | NFS_CAP_LAYOUTERROR, 10162 .init_client = nfs41_init_client, 10163 .shutdown_client = nfs41_shutdown_client, 10164 .match_stateid = nfs41_match_stateid, 10165 .find_root_sec = nfs41_find_root_sec, 10166 .free_lock_state = nfs41_free_lock_state, 10167 .call_sync_ops = &nfs41_call_sync_ops, 10168 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10169 .alloc_seqid = nfs_alloc_no_seqid, 10170 .session_trunk = nfs4_test_session_trunk, 10171 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10172 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10173 .state_renewal_ops = &nfs41_state_renewal_ops, 10174 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10175 }; 10176 #endif 10177 10178 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10179 [0] = &nfs_v4_0_minor_ops, 10180 #if defined(CONFIG_NFS_V4_1) 10181 [1] = &nfs_v4_1_minor_ops, 10182 #endif 10183 #if defined(CONFIG_NFS_V4_2) 10184 [2] = &nfs_v4_2_minor_ops, 10185 #endif 10186 }; 10187 10188 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10189 { 10190 ssize_t error, error2, error3; 10191 10192 error = generic_listxattr(dentry, list, size); 10193 if (error < 0) 10194 return error; 10195 if (list) { 10196 list += error; 10197 size -= error; 10198 } 10199 10200 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10201 if (error2 < 0) 10202 return error2; 10203 10204 if (list) { 10205 list += error2; 10206 size -= error2; 10207 } 10208 10209 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10210 if (error3 < 0) 10211 return error3; 10212 10213 return error + error2 + error3; 10214 } 10215 10216 static const struct inode_operations nfs4_dir_inode_operations = { 10217 .create = nfs_create, 10218 .lookup = nfs_lookup, 10219 .atomic_open = nfs_atomic_open, 10220 .link = nfs_link, 10221 .unlink = nfs_unlink, 10222 .symlink = nfs_symlink, 10223 .mkdir = nfs_mkdir, 10224 .rmdir = nfs_rmdir, 10225 .mknod = nfs_mknod, 10226 .rename = nfs_rename, 10227 .permission = nfs_permission, 10228 .getattr = nfs_getattr, 10229 .setattr = nfs_setattr, 10230 .listxattr = nfs4_listxattr, 10231 }; 10232 10233 static const struct inode_operations nfs4_file_inode_operations = { 10234 .permission = nfs_permission, 10235 .getattr = nfs_getattr, 10236 .setattr = nfs_setattr, 10237 .listxattr = nfs4_listxattr, 10238 }; 10239 10240 const struct nfs_rpc_ops nfs_v4_clientops = { 10241 .version = 4, /* protocol version */ 10242 .dentry_ops = &nfs4_dentry_operations, 10243 .dir_inode_ops = &nfs4_dir_inode_operations, 10244 .file_inode_ops = &nfs4_file_inode_operations, 10245 .file_ops = &nfs4_file_operations, 10246 .getroot = nfs4_proc_get_root, 10247 .submount = nfs4_submount, 10248 .try_get_tree = nfs4_try_get_tree, 10249 .getattr = nfs4_proc_getattr, 10250 .setattr = nfs4_proc_setattr, 10251 .lookup = nfs4_proc_lookup, 10252 .lookupp = nfs4_proc_lookupp, 10253 .access = nfs4_proc_access, 10254 .readlink = nfs4_proc_readlink, 10255 .create = nfs4_proc_create, 10256 .remove = nfs4_proc_remove, 10257 .unlink_setup = nfs4_proc_unlink_setup, 10258 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10259 .unlink_done = nfs4_proc_unlink_done, 10260 .rename_setup = nfs4_proc_rename_setup, 10261 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10262 .rename_done = nfs4_proc_rename_done, 10263 .link = nfs4_proc_link, 10264 .symlink = nfs4_proc_symlink, 10265 .mkdir = nfs4_proc_mkdir, 10266 .rmdir = nfs4_proc_rmdir, 10267 .readdir = nfs4_proc_readdir, 10268 .mknod = nfs4_proc_mknod, 10269 .statfs = nfs4_proc_statfs, 10270 .fsinfo = nfs4_proc_fsinfo, 10271 .pathconf = nfs4_proc_pathconf, 10272 .set_capabilities = nfs4_server_capabilities, 10273 .decode_dirent = nfs4_decode_dirent, 10274 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10275 .read_setup = nfs4_proc_read_setup, 10276 .read_done = nfs4_read_done, 10277 .write_setup = nfs4_proc_write_setup, 10278 .write_done = nfs4_write_done, 10279 .commit_setup = nfs4_proc_commit_setup, 10280 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10281 .commit_done = nfs4_commit_done, 10282 .lock = nfs4_proc_lock, 10283 .clear_acl_cache = nfs4_zap_acl_attr, 10284 .close_context = nfs4_close_context, 10285 .open_context = nfs4_atomic_open, 10286 .have_delegation = nfs4_have_delegation, 10287 .alloc_client = nfs4_alloc_client, 10288 .init_client = nfs4_init_client, 10289 .free_client = nfs4_free_client, 10290 .create_server = nfs4_create_server, 10291 .clone_server = nfs_clone_server, 10292 }; 10293 10294 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10295 .name = XATTR_NAME_NFSV4_ACL, 10296 .list = nfs4_xattr_list_nfs4_acl, 10297 .get = nfs4_xattr_get_nfs4_acl, 10298 .set = nfs4_xattr_set_nfs4_acl, 10299 }; 10300 10301 #ifdef CONFIG_NFS_V4_2 10302 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10303 .prefix = XATTR_USER_PREFIX, 10304 .get = nfs4_xattr_get_nfs4_user, 10305 .set = nfs4_xattr_set_nfs4_user, 10306 }; 10307 #endif 10308 10309 const struct xattr_handler *nfs4_xattr_handlers[] = { 10310 &nfs4_xattr_nfs4_acl_handler, 10311 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10312 &nfs4_xattr_nfs4_label_handler, 10313 #endif 10314 #ifdef CONFIG_NFS_V4_2 10315 &nfs4_xattr_nfs4_user_handler, 10316 #endif 10317 NULL 10318 }; 10319 10320 /* 10321 * Local variables: 10322 * c-basic-offset: 8 10323 * End: 10324 */ 10325