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 "sysfs.h" 67 #include "nfs4idmap.h" 68 #include "nfs4session.h" 69 #include "fscache.h" 70 #include "nfs42.h" 71 72 #include "nfs4trace.h" 73 74 #ifdef CONFIG_NFS_V4_2 75 #include "nfs42.h" 76 #endif /* CONFIG_NFS_V4_2 */ 77 78 #define NFSDBG_FACILITY NFSDBG_PROC 79 80 #define NFS4_BITMASK_SZ 3 81 82 #define NFS4_POLL_RETRY_MIN (HZ/10) 83 #define NFS4_POLL_RETRY_MAX (15*HZ) 84 85 /* file attributes which can be mapped to nfs attributes */ 86 #define NFS4_VALID_ATTRS (ATTR_MODE \ 87 | ATTR_UID \ 88 | ATTR_GID \ 89 | ATTR_SIZE \ 90 | ATTR_ATIME \ 91 | ATTR_MTIME \ 92 | ATTR_CTIME \ 93 | ATTR_ATIME_SET \ 94 | ATTR_MTIME_SET) 95 96 struct nfs4_opendata; 97 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 98 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 99 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 100 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode); 101 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 102 struct nfs_fattr *fattr, struct iattr *sattr, 103 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 104 struct nfs4_label *olabel); 105 #ifdef CONFIG_NFS_V4_1 106 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 107 const struct cred *cred, 108 struct nfs4_slot *slot, 109 bool is_privileged); 110 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 111 const struct cred *); 112 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 113 const struct cred *, bool); 114 #endif 115 static void nfs4_bitmask_adjust(__u32 *bitmask, struct inode *inode, 116 struct nfs_server *server, 117 struct nfs4_label *label); 118 119 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 120 static inline struct nfs4_label * 121 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 122 struct iattr *sattr, struct nfs4_label *label) 123 { 124 int err; 125 126 if (label == NULL) 127 return NULL; 128 129 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 130 return NULL; 131 132 err = security_dentry_init_security(dentry, sattr->ia_mode, 133 &dentry->d_name, (void **)&label->label, &label->len); 134 if (err == 0) 135 return label; 136 137 return NULL; 138 } 139 static inline void 140 nfs4_label_release_security(struct nfs4_label *label) 141 { 142 if (label) 143 security_release_secctx(label->label, label->len); 144 } 145 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 146 { 147 if (label) 148 return server->attr_bitmask; 149 150 return server->attr_bitmask_nl; 151 } 152 #else 153 static inline struct nfs4_label * 154 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 155 struct iattr *sattr, struct nfs4_label *l) 156 { return NULL; } 157 static inline void 158 nfs4_label_release_security(struct nfs4_label *label) 159 { return; } 160 static inline u32 * 161 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 162 { return server->attr_bitmask; } 163 #endif 164 165 /* Prevent leaks of NFSv4 errors into userland */ 166 static int nfs4_map_errors(int err) 167 { 168 if (err >= -1000) 169 return err; 170 switch (err) { 171 case -NFS4ERR_RESOURCE: 172 case -NFS4ERR_LAYOUTTRYLATER: 173 case -NFS4ERR_RECALLCONFLICT: 174 return -EREMOTEIO; 175 case -NFS4ERR_WRONGSEC: 176 case -NFS4ERR_WRONG_CRED: 177 return -EPERM; 178 case -NFS4ERR_BADOWNER: 179 case -NFS4ERR_BADNAME: 180 return -EINVAL; 181 case -NFS4ERR_SHARE_DENIED: 182 return -EACCES; 183 case -NFS4ERR_MINOR_VERS_MISMATCH: 184 return -EPROTONOSUPPORT; 185 case -NFS4ERR_FILE_OPEN: 186 return -EBUSY; 187 default: 188 dprintk("%s could not handle NFSv4 error %d\n", 189 __func__, -err); 190 break; 191 } 192 return -EIO; 193 } 194 195 /* 196 * This is our standard bitmap for GETATTR requests. 197 */ 198 const u32 nfs4_fattr_bitmap[3] = { 199 FATTR4_WORD0_TYPE 200 | FATTR4_WORD0_CHANGE 201 | FATTR4_WORD0_SIZE 202 | FATTR4_WORD0_FSID 203 | FATTR4_WORD0_FILEID, 204 FATTR4_WORD1_MODE 205 | FATTR4_WORD1_NUMLINKS 206 | FATTR4_WORD1_OWNER 207 | FATTR4_WORD1_OWNER_GROUP 208 | FATTR4_WORD1_RAWDEV 209 | FATTR4_WORD1_SPACE_USED 210 | FATTR4_WORD1_TIME_ACCESS 211 | FATTR4_WORD1_TIME_METADATA 212 | FATTR4_WORD1_TIME_MODIFY 213 | FATTR4_WORD1_MOUNTED_ON_FILEID, 214 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 215 FATTR4_WORD2_SECURITY_LABEL 216 #endif 217 }; 218 219 static const u32 nfs4_pnfs_open_bitmap[3] = { 220 FATTR4_WORD0_TYPE 221 | FATTR4_WORD0_CHANGE 222 | FATTR4_WORD0_SIZE 223 | FATTR4_WORD0_FSID 224 | FATTR4_WORD0_FILEID, 225 FATTR4_WORD1_MODE 226 | FATTR4_WORD1_NUMLINKS 227 | FATTR4_WORD1_OWNER 228 | FATTR4_WORD1_OWNER_GROUP 229 | FATTR4_WORD1_RAWDEV 230 | FATTR4_WORD1_SPACE_USED 231 | FATTR4_WORD1_TIME_ACCESS 232 | FATTR4_WORD1_TIME_METADATA 233 | FATTR4_WORD1_TIME_MODIFY, 234 FATTR4_WORD2_MDSTHRESHOLD 235 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 236 | FATTR4_WORD2_SECURITY_LABEL 237 #endif 238 }; 239 240 static const u32 nfs4_open_noattr_bitmap[3] = { 241 FATTR4_WORD0_TYPE 242 | FATTR4_WORD0_FILEID, 243 }; 244 245 const u32 nfs4_statfs_bitmap[3] = { 246 FATTR4_WORD0_FILES_AVAIL 247 | FATTR4_WORD0_FILES_FREE 248 | FATTR4_WORD0_FILES_TOTAL, 249 FATTR4_WORD1_SPACE_AVAIL 250 | FATTR4_WORD1_SPACE_FREE 251 | FATTR4_WORD1_SPACE_TOTAL 252 }; 253 254 const u32 nfs4_pathconf_bitmap[3] = { 255 FATTR4_WORD0_MAXLINK 256 | FATTR4_WORD0_MAXNAME, 257 0 258 }; 259 260 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 261 | FATTR4_WORD0_MAXREAD 262 | FATTR4_WORD0_MAXWRITE 263 | FATTR4_WORD0_LEASE_TIME, 264 FATTR4_WORD1_TIME_DELTA 265 | FATTR4_WORD1_FS_LAYOUT_TYPES, 266 FATTR4_WORD2_LAYOUT_BLKSIZE 267 | FATTR4_WORD2_CLONE_BLKSIZE 268 | FATTR4_WORD2_XATTR_SUPPORT 269 }; 270 271 const u32 nfs4_fs_locations_bitmap[3] = { 272 FATTR4_WORD0_CHANGE 273 | FATTR4_WORD0_SIZE 274 | FATTR4_WORD0_FSID 275 | FATTR4_WORD0_FILEID 276 | FATTR4_WORD0_FS_LOCATIONS, 277 FATTR4_WORD1_OWNER 278 | FATTR4_WORD1_OWNER_GROUP 279 | FATTR4_WORD1_RAWDEV 280 | FATTR4_WORD1_SPACE_USED 281 | FATTR4_WORD1_TIME_ACCESS 282 | FATTR4_WORD1_TIME_METADATA 283 | FATTR4_WORD1_TIME_MODIFY 284 | FATTR4_WORD1_MOUNTED_ON_FILEID, 285 }; 286 287 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 288 struct inode *inode) 289 { 290 unsigned long cache_validity; 291 292 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 293 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 294 return; 295 296 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 297 if (!(cache_validity & NFS_INO_REVAL_FORCED)) 298 cache_validity &= ~(NFS_INO_INVALID_CHANGE 299 | NFS_INO_INVALID_SIZE); 300 301 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 302 dst[0] &= ~FATTR4_WORD0_SIZE; 303 304 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 305 dst[0] &= ~FATTR4_WORD0_CHANGE; 306 } 307 308 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst, 309 const __u32 *src, struct inode *inode) 310 { 311 nfs4_bitmap_copy_adjust(dst, src, inode); 312 } 313 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 315 struct nfs4_readdir_arg *readdir) 316 { 317 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 318 __be32 *start, *p; 319 320 if (cookie > 2) { 321 readdir->cookie = cookie; 322 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 323 return; 324 } 325 326 readdir->cookie = 0; 327 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 328 if (cookie == 2) 329 return; 330 331 /* 332 * NFSv4 servers do not return entries for '.' and '..' 333 * Therefore, we fake these entries here. We let '.' 334 * have cookie 0 and '..' have cookie 1. Note that 335 * when talking to the server, we always send cookie 0 336 * instead of 1 or 2. 337 */ 338 start = p = kmap_atomic(*readdir->pages); 339 340 if (cookie == 0) { 341 *p++ = xdr_one; /* next */ 342 *p++ = xdr_zero; /* cookie, first word */ 343 *p++ = xdr_one; /* cookie, second word */ 344 *p++ = xdr_one; /* entry len */ 345 memcpy(p, ".\0\0\0", 4); /* entry */ 346 p++; 347 *p++ = xdr_one; /* bitmap length */ 348 *p++ = htonl(attrs); /* bitmap */ 349 *p++ = htonl(12); /* attribute buffer length */ 350 *p++ = htonl(NF4DIR); 351 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 352 } 353 354 *p++ = xdr_one; /* next */ 355 *p++ = xdr_zero; /* cookie, first word */ 356 *p++ = xdr_two; /* cookie, second word */ 357 *p++ = xdr_two; /* entry len */ 358 memcpy(p, "..\0\0", 4); /* entry */ 359 p++; 360 *p++ = xdr_one; /* bitmap length */ 361 *p++ = htonl(attrs); /* bitmap */ 362 *p++ = htonl(12); /* attribute buffer length */ 363 *p++ = htonl(NF4DIR); 364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 365 366 readdir->pgbase = (char *)p - (char *)start; 367 readdir->count -= readdir->pgbase; 368 kunmap_atomic(start); 369 } 370 371 static void nfs4_test_and_free_stateid(struct nfs_server *server, 372 nfs4_stateid *stateid, 373 const struct cred *cred) 374 { 375 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 376 377 ops->test_and_free_expired(server, stateid, cred); 378 } 379 380 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 381 nfs4_stateid *stateid, 382 const struct cred *cred) 383 { 384 stateid->type = NFS4_REVOKED_STATEID_TYPE; 385 nfs4_test_and_free_stateid(server, stateid, cred); 386 } 387 388 static void nfs4_free_revoked_stateid(struct nfs_server *server, 389 const nfs4_stateid *stateid, 390 const struct cred *cred) 391 { 392 nfs4_stateid tmp; 393 394 nfs4_stateid_copy(&tmp, stateid); 395 __nfs4_free_revoked_stateid(server, &tmp, cred); 396 } 397 398 static long nfs4_update_delay(long *timeout) 399 { 400 long ret; 401 if (!timeout) 402 return NFS4_POLL_RETRY_MAX; 403 if (*timeout <= 0) 404 *timeout = NFS4_POLL_RETRY_MIN; 405 if (*timeout > NFS4_POLL_RETRY_MAX) 406 *timeout = NFS4_POLL_RETRY_MAX; 407 ret = *timeout; 408 *timeout <<= 1; 409 return ret; 410 } 411 412 static int nfs4_delay_killable(long *timeout) 413 { 414 might_sleep(); 415 416 freezable_schedule_timeout_killable_unsafe( 417 nfs4_update_delay(timeout)); 418 if (!__fatal_signal_pending(current)) 419 return 0; 420 return -EINTR; 421 } 422 423 static int nfs4_delay_interruptible(long *timeout) 424 { 425 might_sleep(); 426 427 freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout)); 428 if (!signal_pending(current)) 429 return 0; 430 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 431 } 432 433 static int nfs4_delay(long *timeout, bool interruptible) 434 { 435 if (interruptible) 436 return nfs4_delay_interruptible(timeout); 437 return nfs4_delay_killable(timeout); 438 } 439 440 static const nfs4_stateid * 441 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 442 { 443 if (!stateid) 444 return NULL; 445 switch (stateid->type) { 446 case NFS4_OPEN_STATEID_TYPE: 447 case NFS4_LOCK_STATEID_TYPE: 448 case NFS4_DELEGATION_STATEID_TYPE: 449 return stateid; 450 default: 451 break; 452 } 453 return NULL; 454 } 455 456 /* This is the error handling routine for processes that are allowed 457 * to sleep. 458 */ 459 static int nfs4_do_handle_exception(struct nfs_server *server, 460 int errorcode, struct nfs4_exception *exception) 461 { 462 struct nfs_client *clp = server->nfs_client; 463 struct nfs4_state *state = exception->state; 464 const nfs4_stateid *stateid; 465 struct inode *inode = exception->inode; 466 int ret = errorcode; 467 468 exception->delay = 0; 469 exception->recovering = 0; 470 exception->retry = 0; 471 472 stateid = nfs4_recoverable_stateid(exception->stateid); 473 if (stateid == NULL && state != NULL) 474 stateid = nfs4_recoverable_stateid(&state->stateid); 475 476 switch(errorcode) { 477 case 0: 478 return 0; 479 case -NFS4ERR_BADHANDLE: 480 case -ESTALE: 481 if (inode != NULL && S_ISREG(inode->i_mode)) 482 pnfs_destroy_layout(NFS_I(inode)); 483 break; 484 case -NFS4ERR_DELEG_REVOKED: 485 case -NFS4ERR_ADMIN_REVOKED: 486 case -NFS4ERR_EXPIRED: 487 case -NFS4ERR_BAD_STATEID: 488 case -NFS4ERR_PARTNER_NO_AUTH: 489 if (inode != NULL && stateid != NULL) { 490 nfs_inode_find_state_and_recover(inode, 491 stateid); 492 goto wait_on_recovery; 493 } 494 fallthrough; 495 case -NFS4ERR_OPENMODE: 496 if (inode) { 497 int err; 498 499 err = nfs_async_inode_return_delegation(inode, 500 stateid); 501 if (err == 0) 502 goto wait_on_recovery; 503 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 504 exception->retry = 1; 505 break; 506 } 507 } 508 if (state == NULL) 509 break; 510 ret = nfs4_schedule_stateid_recovery(server, state); 511 if (ret < 0) 512 break; 513 goto wait_on_recovery; 514 case -NFS4ERR_STALE_STATEID: 515 case -NFS4ERR_STALE_CLIENTID: 516 nfs4_schedule_lease_recovery(clp); 517 goto wait_on_recovery; 518 case -NFS4ERR_MOVED: 519 ret = nfs4_schedule_migration_recovery(server); 520 if (ret < 0) 521 break; 522 goto wait_on_recovery; 523 case -NFS4ERR_LEASE_MOVED: 524 nfs4_schedule_lease_moved_recovery(clp); 525 goto wait_on_recovery; 526 #if defined(CONFIG_NFS_V4_1) 527 case -NFS4ERR_BADSESSION: 528 case -NFS4ERR_BADSLOT: 529 case -NFS4ERR_BAD_HIGH_SLOT: 530 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 531 case -NFS4ERR_DEADSESSION: 532 case -NFS4ERR_SEQ_FALSE_RETRY: 533 case -NFS4ERR_SEQ_MISORDERED: 534 /* Handled in nfs41_sequence_process() */ 535 goto wait_on_recovery; 536 #endif /* defined(CONFIG_NFS_V4_1) */ 537 case -NFS4ERR_FILE_OPEN: 538 if (exception->timeout > HZ) { 539 /* We have retried a decent amount, time to 540 * fail 541 */ 542 ret = -EBUSY; 543 break; 544 } 545 fallthrough; 546 case -NFS4ERR_DELAY: 547 nfs_inc_server_stats(server, NFSIOS_DELAY); 548 fallthrough; 549 case -NFS4ERR_GRACE: 550 case -NFS4ERR_LAYOUTTRYLATER: 551 case -NFS4ERR_RECALLCONFLICT: 552 exception->delay = 1; 553 return 0; 554 555 case -NFS4ERR_RETRY_UNCACHED_REP: 556 case -NFS4ERR_OLD_STATEID: 557 exception->retry = 1; 558 break; 559 case -NFS4ERR_BADOWNER: 560 /* The following works around a Linux server bug! */ 561 case -NFS4ERR_BADNAME: 562 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 563 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 564 exception->retry = 1; 565 printk(KERN_WARNING "NFS: v4 server %s " 566 "does not accept raw " 567 "uid/gids. " 568 "Reenabling the idmapper.\n", 569 server->nfs_client->cl_hostname); 570 } 571 } 572 /* We failed to handle the error */ 573 return nfs4_map_errors(ret); 574 wait_on_recovery: 575 exception->recovering = 1; 576 return 0; 577 } 578 579 /* This is the error handling routine for processes that are allowed 580 * to sleep. 581 */ 582 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 583 { 584 struct nfs_client *clp = server->nfs_client; 585 int ret; 586 587 ret = nfs4_do_handle_exception(server, errorcode, exception); 588 if (exception->delay) { 589 ret = nfs4_delay(&exception->timeout, 590 exception->interruptible); 591 goto out_retry; 592 } 593 if (exception->recovering) { 594 ret = nfs4_wait_clnt_recover(clp); 595 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 596 return -EIO; 597 goto out_retry; 598 } 599 return ret; 600 out_retry: 601 if (ret == 0) 602 exception->retry = 1; 603 return ret; 604 } 605 606 static int 607 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 608 int errorcode, struct nfs4_exception *exception) 609 { 610 struct nfs_client *clp = server->nfs_client; 611 int ret; 612 613 ret = nfs4_do_handle_exception(server, errorcode, exception); 614 if (exception->delay) { 615 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 616 goto out_retry; 617 } 618 if (exception->recovering) { 619 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 620 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 621 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 622 goto out_retry; 623 } 624 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 625 ret = -EIO; 626 return ret; 627 out_retry: 628 if (ret == 0) { 629 exception->retry = 1; 630 /* 631 * For NFS4ERR_MOVED, the client transport will need to 632 * be recomputed after migration recovery has completed. 633 */ 634 if (errorcode == -NFS4ERR_MOVED) 635 rpc_task_release_transport(task); 636 } 637 return ret; 638 } 639 640 int 641 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 642 struct nfs4_state *state, long *timeout) 643 { 644 struct nfs4_exception exception = { 645 .state = state, 646 }; 647 648 if (task->tk_status >= 0) 649 return 0; 650 if (timeout) 651 exception.timeout = *timeout; 652 task->tk_status = nfs4_async_handle_exception(task, server, 653 task->tk_status, 654 &exception); 655 if (exception.delay && timeout) 656 *timeout = exception.timeout; 657 if (exception.retry) 658 return -EAGAIN; 659 return 0; 660 } 661 662 /* 663 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 664 * or 'false' otherwise. 665 */ 666 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 667 { 668 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 669 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 670 } 671 672 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 673 { 674 spin_lock(&clp->cl_lock); 675 if (time_before(clp->cl_last_renewal,timestamp)) 676 clp->cl_last_renewal = timestamp; 677 spin_unlock(&clp->cl_lock); 678 } 679 680 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 681 { 682 struct nfs_client *clp = server->nfs_client; 683 684 if (!nfs4_has_session(clp)) 685 do_renew_lease(clp, timestamp); 686 } 687 688 struct nfs4_call_sync_data { 689 const struct nfs_server *seq_server; 690 struct nfs4_sequence_args *seq_args; 691 struct nfs4_sequence_res *seq_res; 692 }; 693 694 void nfs4_init_sequence(struct nfs4_sequence_args *args, 695 struct nfs4_sequence_res *res, int cache_reply, 696 int privileged) 697 { 698 args->sa_slot = NULL; 699 args->sa_cache_this = cache_reply; 700 args->sa_privileged = privileged; 701 702 res->sr_slot = NULL; 703 } 704 705 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 706 { 707 struct nfs4_slot *slot = res->sr_slot; 708 struct nfs4_slot_table *tbl; 709 710 tbl = slot->table; 711 spin_lock(&tbl->slot_tbl_lock); 712 if (!nfs41_wake_and_assign_slot(tbl, slot)) 713 nfs4_free_slot(tbl, slot); 714 spin_unlock(&tbl->slot_tbl_lock); 715 716 res->sr_slot = NULL; 717 } 718 719 static int nfs40_sequence_done(struct rpc_task *task, 720 struct nfs4_sequence_res *res) 721 { 722 if (res->sr_slot != NULL) 723 nfs40_sequence_free_slot(res); 724 return 1; 725 } 726 727 #if defined(CONFIG_NFS_V4_1) 728 729 static void nfs41_release_slot(struct nfs4_slot *slot) 730 { 731 struct nfs4_session *session; 732 struct nfs4_slot_table *tbl; 733 bool send_new_highest_used_slotid = false; 734 735 if (!slot) 736 return; 737 tbl = slot->table; 738 session = tbl->session; 739 740 /* Bump the slot sequence number */ 741 if (slot->seq_done) 742 slot->seq_nr++; 743 slot->seq_done = 0; 744 745 spin_lock(&tbl->slot_tbl_lock); 746 /* Be nice to the server: try to ensure that the last transmitted 747 * value for highest_user_slotid <= target_highest_slotid 748 */ 749 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 750 send_new_highest_used_slotid = true; 751 752 if (nfs41_wake_and_assign_slot(tbl, slot)) { 753 send_new_highest_used_slotid = false; 754 goto out_unlock; 755 } 756 nfs4_free_slot(tbl, slot); 757 758 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 759 send_new_highest_used_slotid = false; 760 out_unlock: 761 spin_unlock(&tbl->slot_tbl_lock); 762 if (send_new_highest_used_slotid) 763 nfs41_notify_server(session->clp); 764 if (waitqueue_active(&tbl->slot_waitq)) 765 wake_up_all(&tbl->slot_waitq); 766 } 767 768 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 769 { 770 nfs41_release_slot(res->sr_slot); 771 res->sr_slot = NULL; 772 } 773 774 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 775 u32 seqnr) 776 { 777 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 778 slot->seq_nr_highest_sent = seqnr; 779 } 780 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, 781 u32 seqnr) 782 { 783 slot->seq_nr_highest_sent = seqnr; 784 slot->seq_nr_last_acked = seqnr; 785 } 786 787 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 788 struct nfs4_slot *slot) 789 { 790 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 791 if (!IS_ERR(task)) 792 rpc_put_task_async(task); 793 } 794 795 static int nfs41_sequence_process(struct rpc_task *task, 796 struct nfs4_sequence_res *res) 797 { 798 struct nfs4_session *session; 799 struct nfs4_slot *slot = res->sr_slot; 800 struct nfs_client *clp; 801 int status; 802 int ret = 1; 803 804 if (slot == NULL) 805 goto out_noaction; 806 /* don't increment the sequence number if the task wasn't sent */ 807 if (!RPC_WAS_SENT(task) || slot->seq_done) 808 goto out; 809 810 session = slot->table->session; 811 clp = session->clp; 812 813 trace_nfs4_sequence_done(session, res); 814 815 status = res->sr_status; 816 if (task->tk_status == -NFS4ERR_DEADSESSION) 817 status = -NFS4ERR_DEADSESSION; 818 819 /* Check the SEQUENCE operation status */ 820 switch (status) { 821 case 0: 822 /* Mark this sequence number as having been acked */ 823 nfs4_slot_sequence_acked(slot, slot->seq_nr); 824 /* Update the slot's sequence and clientid lease timer */ 825 slot->seq_done = 1; 826 do_renew_lease(clp, res->sr_timestamp); 827 /* Check sequence flags */ 828 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 829 !!slot->privileged); 830 nfs41_update_target_slotid(slot->table, slot, res); 831 break; 832 case 1: 833 /* 834 * sr_status remains 1 if an RPC level error occurred. 835 * The server may or may not have processed the sequence 836 * operation.. 837 */ 838 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 839 slot->seq_done = 1; 840 goto out; 841 case -NFS4ERR_DELAY: 842 /* The server detected a resend of the RPC call and 843 * returned NFS4ERR_DELAY as per Section 2.10.6.2 844 * of RFC5661. 845 */ 846 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 847 __func__, 848 slot->slot_nr, 849 slot->seq_nr); 850 nfs4_slot_sequence_acked(slot, slot->seq_nr); 851 goto out_retry; 852 case -NFS4ERR_RETRY_UNCACHED_REP: 853 case -NFS4ERR_SEQ_FALSE_RETRY: 854 /* 855 * The server thinks we tried to replay a request. 856 * Retry the call after bumping the sequence ID. 857 */ 858 nfs4_slot_sequence_acked(slot, slot->seq_nr); 859 goto retry_new_seq; 860 case -NFS4ERR_BADSLOT: 861 /* 862 * The slot id we used was probably retired. Try again 863 * using a different slot id. 864 */ 865 if (slot->slot_nr < slot->table->target_highest_slotid) 866 goto session_recover; 867 goto retry_nowait; 868 case -NFS4ERR_SEQ_MISORDERED: 869 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 870 /* 871 * Were one or more calls using this slot interrupted? 872 * If the server never received the request, then our 873 * transmitted slot sequence number may be too high. However, 874 * if the server did receive the request then it might 875 * accidentally give us a reply with a mismatched operation. 876 * We can sort this out by sending a lone sequence operation 877 * to the server on the same slot. 878 */ 879 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 880 slot->seq_nr--; 881 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 882 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 883 res->sr_slot = NULL; 884 } 885 goto retry_nowait; 886 } 887 /* 888 * RFC5661: 889 * A retry might be sent while the original request is 890 * still in progress on the replier. The replier SHOULD 891 * deal with the issue by returning NFS4ERR_DELAY as the 892 * reply to SEQUENCE or CB_SEQUENCE operation, but 893 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 894 * 895 * Restart the search after a delay. 896 */ 897 slot->seq_nr = slot->seq_nr_highest_sent; 898 goto out_retry; 899 case -NFS4ERR_BADSESSION: 900 case -NFS4ERR_DEADSESSION: 901 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 902 goto session_recover; 903 default: 904 /* Just update the slot sequence no. */ 905 slot->seq_done = 1; 906 } 907 out: 908 /* The session may be reset by one of the error handlers. */ 909 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 910 out_noaction: 911 return ret; 912 session_recover: 913 nfs4_schedule_session_recovery(session, status); 914 dprintk("%s ERROR: %d Reset session\n", __func__, status); 915 nfs41_sequence_free_slot(res); 916 goto out; 917 retry_new_seq: 918 ++slot->seq_nr; 919 retry_nowait: 920 if (rpc_restart_call_prepare(task)) { 921 nfs41_sequence_free_slot(res); 922 task->tk_status = 0; 923 ret = 0; 924 } 925 goto out; 926 out_retry: 927 if (!rpc_restart_call(task)) 928 goto out; 929 rpc_delay(task, NFS4_POLL_RETRY_MAX); 930 return 0; 931 } 932 933 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 934 { 935 if (!nfs41_sequence_process(task, res)) 936 return 0; 937 if (res->sr_slot != NULL) 938 nfs41_sequence_free_slot(res); 939 return 1; 940 941 } 942 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 943 944 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 945 { 946 if (res->sr_slot == NULL) 947 return 1; 948 if (res->sr_slot->table->session != NULL) 949 return nfs41_sequence_process(task, res); 950 return nfs40_sequence_done(task, res); 951 } 952 953 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 954 { 955 if (res->sr_slot != NULL) { 956 if (res->sr_slot->table->session != NULL) 957 nfs41_sequence_free_slot(res); 958 else 959 nfs40_sequence_free_slot(res); 960 } 961 } 962 963 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 964 { 965 if (res->sr_slot == NULL) 966 return 1; 967 if (!res->sr_slot->table->session) 968 return nfs40_sequence_done(task, res); 969 return nfs41_sequence_done(task, res); 970 } 971 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 972 973 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 974 { 975 struct nfs4_call_sync_data *data = calldata; 976 977 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 978 979 nfs4_setup_sequence(data->seq_server->nfs_client, 980 data->seq_args, data->seq_res, task); 981 } 982 983 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 984 { 985 struct nfs4_call_sync_data *data = calldata; 986 987 nfs41_sequence_done(task, data->seq_res); 988 } 989 990 static const struct rpc_call_ops nfs41_call_sync_ops = { 991 .rpc_call_prepare = nfs41_call_sync_prepare, 992 .rpc_call_done = nfs41_call_sync_done, 993 }; 994 995 #else /* !CONFIG_NFS_V4_1 */ 996 997 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 998 { 999 return nfs40_sequence_done(task, res); 1000 } 1001 1002 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1003 { 1004 if (res->sr_slot != NULL) 1005 nfs40_sequence_free_slot(res); 1006 } 1007 1008 int nfs4_sequence_done(struct rpc_task *task, 1009 struct nfs4_sequence_res *res) 1010 { 1011 return nfs40_sequence_done(task, res); 1012 } 1013 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1014 1015 #endif /* !CONFIG_NFS_V4_1 */ 1016 1017 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1018 { 1019 res->sr_timestamp = jiffies; 1020 res->sr_status_flags = 0; 1021 res->sr_status = 1; 1022 } 1023 1024 static 1025 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1026 struct nfs4_sequence_res *res, 1027 struct nfs4_slot *slot) 1028 { 1029 if (!slot) 1030 return; 1031 slot->privileged = args->sa_privileged ? 1 : 0; 1032 args->sa_slot = slot; 1033 1034 res->sr_slot = slot; 1035 } 1036 1037 int nfs4_setup_sequence(struct nfs_client *client, 1038 struct nfs4_sequence_args *args, 1039 struct nfs4_sequence_res *res, 1040 struct rpc_task *task) 1041 { 1042 struct nfs4_session *session = nfs4_get_session(client); 1043 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1044 struct nfs4_slot *slot; 1045 1046 /* slot already allocated? */ 1047 if (res->sr_slot != NULL) 1048 goto out_start; 1049 1050 if (session) 1051 tbl = &session->fc_slot_table; 1052 1053 spin_lock(&tbl->slot_tbl_lock); 1054 /* The state manager will wait until the slot table is empty */ 1055 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1056 goto out_sleep; 1057 1058 slot = nfs4_alloc_slot(tbl); 1059 if (IS_ERR(slot)) { 1060 if (slot == ERR_PTR(-ENOMEM)) 1061 goto out_sleep_timeout; 1062 goto out_sleep; 1063 } 1064 spin_unlock(&tbl->slot_tbl_lock); 1065 1066 nfs4_sequence_attach_slot(args, res, slot); 1067 1068 trace_nfs4_setup_sequence(session, args); 1069 out_start: 1070 nfs41_sequence_res_init(res); 1071 rpc_call_start(task); 1072 return 0; 1073 out_sleep_timeout: 1074 /* Try again in 1/4 second */ 1075 if (args->sa_privileged) 1076 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1077 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1078 else 1079 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1080 NULL, jiffies + (HZ >> 2)); 1081 spin_unlock(&tbl->slot_tbl_lock); 1082 return -EAGAIN; 1083 out_sleep: 1084 if (args->sa_privileged) 1085 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1086 RPC_PRIORITY_PRIVILEGED); 1087 else 1088 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1089 spin_unlock(&tbl->slot_tbl_lock); 1090 return -EAGAIN; 1091 } 1092 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1093 1094 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1095 { 1096 struct nfs4_call_sync_data *data = calldata; 1097 nfs4_setup_sequence(data->seq_server->nfs_client, 1098 data->seq_args, data->seq_res, task); 1099 } 1100 1101 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1102 { 1103 struct nfs4_call_sync_data *data = calldata; 1104 nfs4_sequence_done(task, data->seq_res); 1105 } 1106 1107 static const struct rpc_call_ops nfs40_call_sync_ops = { 1108 .rpc_call_prepare = nfs40_call_sync_prepare, 1109 .rpc_call_done = nfs40_call_sync_done, 1110 }; 1111 1112 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1113 { 1114 int ret; 1115 struct rpc_task *task; 1116 1117 task = rpc_run_task(task_setup); 1118 if (IS_ERR(task)) 1119 return PTR_ERR(task); 1120 1121 ret = task->tk_status; 1122 rpc_put_task(task); 1123 return ret; 1124 } 1125 1126 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1127 struct nfs_server *server, 1128 struct rpc_message *msg, 1129 struct nfs4_sequence_args *args, 1130 struct nfs4_sequence_res *res, 1131 unsigned short task_flags) 1132 { 1133 struct nfs_client *clp = server->nfs_client; 1134 struct nfs4_call_sync_data data = { 1135 .seq_server = server, 1136 .seq_args = args, 1137 .seq_res = res, 1138 }; 1139 struct rpc_task_setup task_setup = { 1140 .rpc_client = clnt, 1141 .rpc_message = msg, 1142 .callback_ops = clp->cl_mvops->call_sync_ops, 1143 .callback_data = &data, 1144 .flags = task_flags, 1145 }; 1146 1147 return nfs4_call_sync_custom(&task_setup); 1148 } 1149 1150 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1151 struct nfs_server *server, 1152 struct rpc_message *msg, 1153 struct nfs4_sequence_args *args, 1154 struct nfs4_sequence_res *res) 1155 { 1156 return nfs4_do_call_sync(clnt, server, msg, args, res, 0); 1157 } 1158 1159 1160 int nfs4_call_sync(struct rpc_clnt *clnt, 1161 struct nfs_server *server, 1162 struct rpc_message *msg, 1163 struct nfs4_sequence_args *args, 1164 struct nfs4_sequence_res *res, 1165 int cache_reply) 1166 { 1167 nfs4_init_sequence(args, res, cache_reply, 0); 1168 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1169 } 1170 1171 static void 1172 nfs4_inc_nlink_locked(struct inode *inode) 1173 { 1174 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER; 1175 inc_nlink(inode); 1176 } 1177 1178 static void 1179 nfs4_dec_nlink_locked(struct inode *inode) 1180 { 1181 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER; 1182 drop_nlink(inode); 1183 } 1184 1185 static void 1186 nfs4_update_changeattr_locked(struct inode *inode, 1187 struct nfs4_change_info *cinfo, 1188 unsigned long timestamp, unsigned long cache_validity) 1189 { 1190 struct nfs_inode *nfsi = NFS_I(inode); 1191 1192 nfsi->cache_validity |= NFS_INO_INVALID_CTIME 1193 | NFS_INO_INVALID_MTIME 1194 | cache_validity; 1195 1196 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(inode)) { 1197 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; 1198 nfsi->attrtimeo_timestamp = jiffies; 1199 } else { 1200 if (S_ISDIR(inode->i_mode)) { 1201 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1202 nfs_force_lookup_revalidate(inode); 1203 } else { 1204 if (!NFS_PROTO(inode)->have_delegation(inode, 1205 FMODE_READ)) 1206 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; 1207 } 1208 1209 if (cinfo->before != inode_peek_iversion_raw(inode)) 1210 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | 1211 NFS_INO_INVALID_ACL | 1212 NFS_INO_INVALID_XATTR; 1213 } 1214 inode_set_iversion_raw(inode, cinfo->after); 1215 nfsi->read_cache_jiffies = timestamp; 1216 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1217 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1218 1219 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1220 nfs_fscache_invalidate(inode); 1221 } 1222 1223 void 1224 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1225 unsigned long timestamp, unsigned long cache_validity) 1226 { 1227 spin_lock(&dir->i_lock); 1228 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1229 spin_unlock(&dir->i_lock); 1230 } 1231 1232 struct nfs4_open_createattrs { 1233 struct nfs4_label *label; 1234 struct iattr *sattr; 1235 const __u32 verf[2]; 1236 }; 1237 1238 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1239 int err, struct nfs4_exception *exception) 1240 { 1241 if (err != -EINVAL) 1242 return false; 1243 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1244 return false; 1245 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1246 exception->retry = 1; 1247 return true; 1248 } 1249 1250 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1251 { 1252 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1253 } 1254 1255 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1256 { 1257 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1258 1259 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1260 } 1261 1262 static u32 1263 nfs4_map_atomic_open_share(struct nfs_server *server, 1264 fmode_t fmode, int openflags) 1265 { 1266 u32 res = 0; 1267 1268 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1269 case FMODE_READ: 1270 res = NFS4_SHARE_ACCESS_READ; 1271 break; 1272 case FMODE_WRITE: 1273 res = NFS4_SHARE_ACCESS_WRITE; 1274 break; 1275 case FMODE_READ|FMODE_WRITE: 1276 res = NFS4_SHARE_ACCESS_BOTH; 1277 } 1278 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1279 goto out; 1280 /* Want no delegation if we're using O_DIRECT */ 1281 if (openflags & O_DIRECT) 1282 res |= NFS4_SHARE_WANT_NO_DELEG; 1283 out: 1284 return res; 1285 } 1286 1287 static enum open_claim_type4 1288 nfs4_map_atomic_open_claim(struct nfs_server *server, 1289 enum open_claim_type4 claim) 1290 { 1291 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1292 return claim; 1293 switch (claim) { 1294 default: 1295 return claim; 1296 case NFS4_OPEN_CLAIM_FH: 1297 return NFS4_OPEN_CLAIM_NULL; 1298 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1299 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1300 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1301 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1302 } 1303 } 1304 1305 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1306 { 1307 p->o_res.f_attr = &p->f_attr; 1308 p->o_res.f_label = p->f_label; 1309 p->o_res.seqid = p->o_arg.seqid; 1310 p->c_res.seqid = p->c_arg.seqid; 1311 p->o_res.server = p->o_arg.server; 1312 p->o_res.access_request = p->o_arg.access; 1313 nfs_fattr_init(&p->f_attr); 1314 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1315 } 1316 1317 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1318 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1319 const struct nfs4_open_createattrs *c, 1320 enum open_claim_type4 claim, 1321 gfp_t gfp_mask) 1322 { 1323 struct dentry *parent = dget_parent(dentry); 1324 struct inode *dir = d_inode(parent); 1325 struct nfs_server *server = NFS_SERVER(dir); 1326 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1327 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1328 struct nfs4_opendata *p; 1329 1330 p = kzalloc(sizeof(*p), gfp_mask); 1331 if (p == NULL) 1332 goto err; 1333 1334 p->f_label = nfs4_label_alloc(server, gfp_mask); 1335 if (IS_ERR(p->f_label)) 1336 goto err_free_p; 1337 1338 p->a_label = nfs4_label_alloc(server, gfp_mask); 1339 if (IS_ERR(p->a_label)) 1340 goto err_free_f; 1341 1342 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1343 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1344 if (IS_ERR(p->o_arg.seqid)) 1345 goto err_free_label; 1346 nfs_sb_active(dentry->d_sb); 1347 p->dentry = dget(dentry); 1348 p->dir = parent; 1349 p->owner = sp; 1350 atomic_inc(&sp->so_count); 1351 p->o_arg.open_flags = flags; 1352 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1353 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1354 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1355 fmode, flags); 1356 if (flags & O_CREAT) { 1357 p->o_arg.umask = current_umask(); 1358 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1359 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1360 p->o_arg.u.attrs = &p->attrs; 1361 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1362 1363 memcpy(p->o_arg.u.verifier.data, c->verf, 1364 sizeof(p->o_arg.u.verifier.data)); 1365 } 1366 } 1367 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1368 * will return permission denied for all bits until close */ 1369 if (!(flags & O_EXCL)) { 1370 /* ask server to check for all possible rights as results 1371 * are cached */ 1372 switch (p->o_arg.claim) { 1373 default: 1374 break; 1375 case NFS4_OPEN_CLAIM_NULL: 1376 case NFS4_OPEN_CLAIM_FH: 1377 p->o_arg.access = NFS4_ACCESS_READ | 1378 NFS4_ACCESS_MODIFY | 1379 NFS4_ACCESS_EXTEND | 1380 NFS4_ACCESS_EXECUTE; 1381 #ifdef CONFIG_NFS_V4_2 1382 if (server->caps & NFS_CAP_XATTR) 1383 p->o_arg.access |= NFS4_ACCESS_XAREAD | 1384 NFS4_ACCESS_XAWRITE | 1385 NFS4_ACCESS_XALIST; 1386 #endif 1387 } 1388 } 1389 p->o_arg.clientid = server->nfs_client->cl_clientid; 1390 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1391 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1392 p->o_arg.name = &dentry->d_name; 1393 p->o_arg.server = server; 1394 p->o_arg.bitmask = nfs4_bitmask(server, label); 1395 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1396 switch (p->o_arg.claim) { 1397 case NFS4_OPEN_CLAIM_NULL: 1398 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1399 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1400 p->o_arg.fh = NFS_FH(dir); 1401 break; 1402 case NFS4_OPEN_CLAIM_PREVIOUS: 1403 case NFS4_OPEN_CLAIM_FH: 1404 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1405 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1406 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1407 } 1408 p->c_arg.fh = &p->o_res.fh; 1409 p->c_arg.stateid = &p->o_res.stateid; 1410 p->c_arg.seqid = p->o_arg.seqid; 1411 nfs4_init_opendata_res(p); 1412 kref_init(&p->kref); 1413 return p; 1414 1415 err_free_label: 1416 nfs4_label_free(p->a_label); 1417 err_free_f: 1418 nfs4_label_free(p->f_label); 1419 err_free_p: 1420 kfree(p); 1421 err: 1422 dput(parent); 1423 return NULL; 1424 } 1425 1426 static void nfs4_opendata_free(struct kref *kref) 1427 { 1428 struct nfs4_opendata *p = container_of(kref, 1429 struct nfs4_opendata, kref); 1430 struct super_block *sb = p->dentry->d_sb; 1431 1432 nfs4_lgopen_release(p->lgp); 1433 nfs_free_seqid(p->o_arg.seqid); 1434 nfs4_sequence_free_slot(&p->o_res.seq_res); 1435 if (p->state != NULL) 1436 nfs4_put_open_state(p->state); 1437 nfs4_put_state_owner(p->owner); 1438 1439 nfs4_label_free(p->a_label); 1440 nfs4_label_free(p->f_label); 1441 1442 dput(p->dir); 1443 dput(p->dentry); 1444 nfs_sb_deactive(sb); 1445 nfs_fattr_free_names(&p->f_attr); 1446 kfree(p->f_attr.mdsthreshold); 1447 kfree(p); 1448 } 1449 1450 static void nfs4_opendata_put(struct nfs4_opendata *p) 1451 { 1452 if (p != NULL) 1453 kref_put(&p->kref, nfs4_opendata_free); 1454 } 1455 1456 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1457 fmode_t fmode) 1458 { 1459 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1460 case FMODE_READ|FMODE_WRITE: 1461 return state->n_rdwr != 0; 1462 case FMODE_WRITE: 1463 return state->n_wronly != 0; 1464 case FMODE_READ: 1465 return state->n_rdonly != 0; 1466 } 1467 WARN_ON_ONCE(1); 1468 return false; 1469 } 1470 1471 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1472 int open_mode, enum open_claim_type4 claim) 1473 { 1474 int ret = 0; 1475 1476 if (open_mode & (O_EXCL|O_TRUNC)) 1477 goto out; 1478 switch (claim) { 1479 case NFS4_OPEN_CLAIM_NULL: 1480 case NFS4_OPEN_CLAIM_FH: 1481 goto out; 1482 default: 1483 break; 1484 } 1485 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1486 case FMODE_READ: 1487 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1488 && state->n_rdonly != 0; 1489 break; 1490 case FMODE_WRITE: 1491 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1492 && state->n_wronly != 0; 1493 break; 1494 case FMODE_READ|FMODE_WRITE: 1495 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1496 && state->n_rdwr != 0; 1497 } 1498 out: 1499 return ret; 1500 } 1501 1502 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1503 enum open_claim_type4 claim) 1504 { 1505 if (delegation == NULL) 1506 return 0; 1507 if ((delegation->type & fmode) != fmode) 1508 return 0; 1509 switch (claim) { 1510 case NFS4_OPEN_CLAIM_NULL: 1511 case NFS4_OPEN_CLAIM_FH: 1512 break; 1513 case NFS4_OPEN_CLAIM_PREVIOUS: 1514 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1515 break; 1516 fallthrough; 1517 default: 1518 return 0; 1519 } 1520 nfs_mark_delegation_referenced(delegation); 1521 return 1; 1522 } 1523 1524 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1525 { 1526 switch (fmode) { 1527 case FMODE_WRITE: 1528 state->n_wronly++; 1529 break; 1530 case FMODE_READ: 1531 state->n_rdonly++; 1532 break; 1533 case FMODE_READ|FMODE_WRITE: 1534 state->n_rdwr++; 1535 } 1536 nfs4_state_set_mode_locked(state, state->state | fmode); 1537 } 1538 1539 #ifdef CONFIG_NFS_V4_1 1540 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1541 { 1542 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1543 return true; 1544 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1545 return true; 1546 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1547 return true; 1548 return false; 1549 } 1550 #endif /* CONFIG_NFS_V4_1 */ 1551 1552 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1553 { 1554 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1555 wake_up_all(&state->waitq); 1556 } 1557 1558 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1559 { 1560 struct nfs_client *clp = state->owner->so_server->nfs_client; 1561 bool need_recover = false; 1562 1563 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1564 need_recover = true; 1565 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1566 need_recover = true; 1567 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1568 need_recover = true; 1569 if (need_recover) 1570 nfs4_state_mark_reclaim_nograce(clp, state); 1571 } 1572 1573 /* 1574 * Check for whether or not the caller may update the open stateid 1575 * to the value passed in by stateid. 1576 * 1577 * Note: This function relies heavily on the server implementing 1578 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1579 * correctly. 1580 * i.e. The stateid seqids have to be initialised to 1, and 1581 * are then incremented on every state transition. 1582 */ 1583 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1584 const nfs4_stateid *stateid) 1585 { 1586 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1587 /* The common case - we're updating to a new sequence number */ 1588 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1589 nfs4_stateid_is_next(&state->open_stateid, stateid)) { 1590 return true; 1591 } 1592 } else { 1593 /* This is the first OPEN in this generation */ 1594 if (stateid->seqid == cpu_to_be32(1)) 1595 return true; 1596 } 1597 return false; 1598 } 1599 1600 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1601 { 1602 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1603 return; 1604 if (state->n_wronly) 1605 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1606 if (state->n_rdonly) 1607 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1608 if (state->n_rdwr) 1609 set_bit(NFS_O_RDWR_STATE, &state->flags); 1610 set_bit(NFS_OPEN_STATE, &state->flags); 1611 } 1612 1613 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1614 nfs4_stateid *stateid, fmode_t fmode) 1615 { 1616 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1617 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1618 case FMODE_WRITE: 1619 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1620 break; 1621 case FMODE_READ: 1622 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1623 break; 1624 case 0: 1625 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1626 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1627 clear_bit(NFS_OPEN_STATE, &state->flags); 1628 } 1629 if (stateid == NULL) 1630 return; 1631 /* Handle OPEN+OPEN_DOWNGRADE races */ 1632 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1633 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1634 nfs_resync_open_stateid_locked(state); 1635 goto out; 1636 } 1637 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1638 nfs4_stateid_copy(&state->stateid, stateid); 1639 nfs4_stateid_copy(&state->open_stateid, stateid); 1640 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1641 out: 1642 nfs_state_log_update_open_stateid(state); 1643 } 1644 1645 static void nfs_clear_open_stateid(struct nfs4_state *state, 1646 nfs4_stateid *arg_stateid, 1647 nfs4_stateid *stateid, fmode_t fmode) 1648 { 1649 write_seqlock(&state->seqlock); 1650 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1651 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1652 nfs_clear_open_stateid_locked(state, stateid, fmode); 1653 write_sequnlock(&state->seqlock); 1654 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1655 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1656 } 1657 1658 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1659 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1660 __must_hold(&state->owner->so_lock) 1661 __must_hold(&state->seqlock) 1662 __must_hold(RCU) 1663 1664 { 1665 DEFINE_WAIT(wait); 1666 int status = 0; 1667 for (;;) { 1668 1669 if (nfs_stateid_is_sequential(state, stateid)) 1670 break; 1671 1672 if (status) 1673 break; 1674 /* Rely on seqids for serialisation with NFSv4.0 */ 1675 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1676 break; 1677 1678 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1679 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1680 /* 1681 * Ensure we process the state changes in the same order 1682 * in which the server processed them by delaying the 1683 * update of the stateid until we are in sequence. 1684 */ 1685 write_sequnlock(&state->seqlock); 1686 spin_unlock(&state->owner->so_lock); 1687 rcu_read_unlock(); 1688 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1689 1690 if (!signal_pending(current)) { 1691 if (schedule_timeout(5*HZ) == 0) 1692 status = -EAGAIN; 1693 else 1694 status = 0; 1695 } else 1696 status = -EINTR; 1697 finish_wait(&state->waitq, &wait); 1698 rcu_read_lock(); 1699 spin_lock(&state->owner->so_lock); 1700 write_seqlock(&state->seqlock); 1701 } 1702 1703 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1704 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1705 nfs4_stateid_copy(freeme, &state->open_stateid); 1706 nfs_test_and_clear_all_open_stateid(state); 1707 } 1708 1709 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1710 nfs4_stateid_copy(&state->stateid, stateid); 1711 nfs4_stateid_copy(&state->open_stateid, stateid); 1712 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1713 nfs_state_log_update_open_stateid(state); 1714 } 1715 1716 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1717 const nfs4_stateid *open_stateid, 1718 fmode_t fmode, 1719 nfs4_stateid *freeme) 1720 { 1721 /* 1722 * Protect the call to nfs4_state_set_mode_locked and 1723 * serialise the stateid update 1724 */ 1725 write_seqlock(&state->seqlock); 1726 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1727 switch (fmode) { 1728 case FMODE_READ: 1729 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1730 break; 1731 case FMODE_WRITE: 1732 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1733 break; 1734 case FMODE_READ|FMODE_WRITE: 1735 set_bit(NFS_O_RDWR_STATE, &state->flags); 1736 } 1737 set_bit(NFS_OPEN_STATE, &state->flags); 1738 write_sequnlock(&state->seqlock); 1739 } 1740 1741 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1742 { 1743 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1744 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1745 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1746 clear_bit(NFS_OPEN_STATE, &state->flags); 1747 } 1748 1749 static void nfs_state_set_delegation(struct nfs4_state *state, 1750 const nfs4_stateid *deleg_stateid, 1751 fmode_t fmode) 1752 { 1753 /* 1754 * Protect the call to nfs4_state_set_mode_locked and 1755 * serialise the stateid update 1756 */ 1757 write_seqlock(&state->seqlock); 1758 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1759 set_bit(NFS_DELEGATED_STATE, &state->flags); 1760 write_sequnlock(&state->seqlock); 1761 } 1762 1763 static void nfs_state_clear_delegation(struct nfs4_state *state) 1764 { 1765 write_seqlock(&state->seqlock); 1766 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1767 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1768 write_sequnlock(&state->seqlock); 1769 } 1770 1771 int update_open_stateid(struct nfs4_state *state, 1772 const nfs4_stateid *open_stateid, 1773 const nfs4_stateid *delegation, 1774 fmode_t fmode) 1775 { 1776 struct nfs_server *server = NFS_SERVER(state->inode); 1777 struct nfs_client *clp = server->nfs_client; 1778 struct nfs_inode *nfsi = NFS_I(state->inode); 1779 struct nfs_delegation *deleg_cur; 1780 nfs4_stateid freeme = { }; 1781 int ret = 0; 1782 1783 fmode &= (FMODE_READ|FMODE_WRITE); 1784 1785 rcu_read_lock(); 1786 spin_lock(&state->owner->so_lock); 1787 if (open_stateid != NULL) { 1788 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1789 ret = 1; 1790 } 1791 1792 deleg_cur = nfs4_get_valid_delegation(state->inode); 1793 if (deleg_cur == NULL) 1794 goto no_delegation; 1795 1796 spin_lock(&deleg_cur->lock); 1797 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1798 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1799 (deleg_cur->type & fmode) != fmode) 1800 goto no_delegation_unlock; 1801 1802 if (delegation == NULL) 1803 delegation = &deleg_cur->stateid; 1804 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1805 goto no_delegation_unlock; 1806 1807 nfs_mark_delegation_referenced(deleg_cur); 1808 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1809 ret = 1; 1810 no_delegation_unlock: 1811 spin_unlock(&deleg_cur->lock); 1812 no_delegation: 1813 if (ret) 1814 update_open_stateflags(state, fmode); 1815 spin_unlock(&state->owner->so_lock); 1816 rcu_read_unlock(); 1817 1818 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1819 nfs4_schedule_state_manager(clp); 1820 if (freeme.type != 0) 1821 nfs4_test_and_free_stateid(server, &freeme, 1822 state->owner->so_cred); 1823 1824 return ret; 1825 } 1826 1827 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1828 const nfs4_stateid *stateid) 1829 { 1830 struct nfs4_state *state = lsp->ls_state; 1831 bool ret = false; 1832 1833 spin_lock(&state->state_lock); 1834 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1835 goto out_noupdate; 1836 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1837 goto out_noupdate; 1838 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1839 ret = true; 1840 out_noupdate: 1841 spin_unlock(&state->state_lock); 1842 return ret; 1843 } 1844 1845 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1846 { 1847 struct nfs_delegation *delegation; 1848 1849 fmode &= FMODE_READ|FMODE_WRITE; 1850 rcu_read_lock(); 1851 delegation = nfs4_get_valid_delegation(inode); 1852 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1853 rcu_read_unlock(); 1854 return; 1855 } 1856 rcu_read_unlock(); 1857 nfs4_inode_return_delegation(inode); 1858 } 1859 1860 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1861 { 1862 struct nfs4_state *state = opendata->state; 1863 struct nfs_delegation *delegation; 1864 int open_mode = opendata->o_arg.open_flags; 1865 fmode_t fmode = opendata->o_arg.fmode; 1866 enum open_claim_type4 claim = opendata->o_arg.claim; 1867 nfs4_stateid stateid; 1868 int ret = -EAGAIN; 1869 1870 for (;;) { 1871 spin_lock(&state->owner->so_lock); 1872 if (can_open_cached(state, fmode, open_mode, claim)) { 1873 update_open_stateflags(state, fmode); 1874 spin_unlock(&state->owner->so_lock); 1875 goto out_return_state; 1876 } 1877 spin_unlock(&state->owner->so_lock); 1878 rcu_read_lock(); 1879 delegation = nfs4_get_valid_delegation(state->inode); 1880 if (!can_open_delegated(delegation, fmode, claim)) { 1881 rcu_read_unlock(); 1882 break; 1883 } 1884 /* Save the delegation */ 1885 nfs4_stateid_copy(&stateid, &delegation->stateid); 1886 rcu_read_unlock(); 1887 nfs_release_seqid(opendata->o_arg.seqid); 1888 if (!opendata->is_recover) { 1889 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1890 if (ret != 0) 1891 goto out; 1892 } 1893 ret = -EAGAIN; 1894 1895 /* Try to update the stateid using the delegation */ 1896 if (update_open_stateid(state, NULL, &stateid, fmode)) 1897 goto out_return_state; 1898 } 1899 out: 1900 return ERR_PTR(ret); 1901 out_return_state: 1902 refcount_inc(&state->count); 1903 return state; 1904 } 1905 1906 static void 1907 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1908 { 1909 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1910 struct nfs_delegation *delegation; 1911 int delegation_flags = 0; 1912 1913 rcu_read_lock(); 1914 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1915 if (delegation) 1916 delegation_flags = delegation->flags; 1917 rcu_read_unlock(); 1918 switch (data->o_arg.claim) { 1919 default: 1920 break; 1921 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1922 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1923 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1924 "returning a delegation for " 1925 "OPEN(CLAIM_DELEGATE_CUR)\n", 1926 clp->cl_hostname); 1927 return; 1928 } 1929 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1930 nfs_inode_set_delegation(state->inode, 1931 data->owner->so_cred, 1932 data->o_res.delegation_type, 1933 &data->o_res.delegation, 1934 data->o_res.pagemod_limit); 1935 else 1936 nfs_inode_reclaim_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 1942 if (data->o_res.do_recall) 1943 nfs_async_inode_return_delegation(state->inode, 1944 &data->o_res.delegation); 1945 } 1946 1947 /* 1948 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1949 * and update the nfs4_state. 1950 */ 1951 static struct nfs4_state * 1952 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1953 { 1954 struct inode *inode = data->state->inode; 1955 struct nfs4_state *state = data->state; 1956 int ret; 1957 1958 if (!data->rpc_done) { 1959 if (data->rpc_status) 1960 return ERR_PTR(data->rpc_status); 1961 /* cached opens have already been processed */ 1962 goto update; 1963 } 1964 1965 ret = nfs_refresh_inode(inode, &data->f_attr); 1966 if (ret) 1967 return ERR_PTR(ret); 1968 1969 if (data->o_res.delegation_type != 0) 1970 nfs4_opendata_check_deleg(data, state); 1971 update: 1972 if (!update_open_stateid(state, &data->o_res.stateid, 1973 NULL, data->o_arg.fmode)) 1974 return ERR_PTR(-EAGAIN); 1975 refcount_inc(&state->count); 1976 1977 return state; 1978 } 1979 1980 static struct inode * 1981 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1982 { 1983 struct inode *inode; 1984 1985 switch (data->o_arg.claim) { 1986 case NFS4_OPEN_CLAIM_NULL: 1987 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1988 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1989 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1990 return ERR_PTR(-EAGAIN); 1991 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 1992 &data->f_attr, data->f_label); 1993 break; 1994 default: 1995 inode = d_inode(data->dentry); 1996 ihold(inode); 1997 nfs_refresh_inode(inode, &data->f_attr); 1998 } 1999 return inode; 2000 } 2001 2002 static struct nfs4_state * 2003 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2004 { 2005 struct nfs4_state *state; 2006 struct inode *inode; 2007 2008 inode = nfs4_opendata_get_inode(data); 2009 if (IS_ERR(inode)) 2010 return ERR_CAST(inode); 2011 if (data->state != NULL && data->state->inode == inode) { 2012 state = data->state; 2013 refcount_inc(&state->count); 2014 } else 2015 state = nfs4_get_open_state(inode, data->owner); 2016 iput(inode); 2017 if (state == NULL) 2018 state = ERR_PTR(-ENOMEM); 2019 return state; 2020 } 2021 2022 static struct nfs4_state * 2023 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2024 { 2025 struct nfs4_state *state; 2026 2027 if (!data->rpc_done) { 2028 state = nfs4_try_open_cached(data); 2029 trace_nfs4_cached_open(data->state); 2030 goto out; 2031 } 2032 2033 state = nfs4_opendata_find_nfs4_state(data); 2034 if (IS_ERR(state)) 2035 goto out; 2036 2037 if (data->o_res.delegation_type != 0) 2038 nfs4_opendata_check_deleg(data, state); 2039 if (!update_open_stateid(state, &data->o_res.stateid, 2040 NULL, data->o_arg.fmode)) { 2041 nfs4_put_open_state(state); 2042 state = ERR_PTR(-EAGAIN); 2043 } 2044 out: 2045 nfs_release_seqid(data->o_arg.seqid); 2046 return state; 2047 } 2048 2049 static struct nfs4_state * 2050 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2051 { 2052 struct nfs4_state *ret; 2053 2054 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2055 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2056 else 2057 ret = _nfs4_opendata_to_nfs4_state(data); 2058 nfs4_sequence_free_slot(&data->o_res.seq_res); 2059 return ret; 2060 } 2061 2062 static struct nfs_open_context * 2063 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2064 { 2065 struct nfs_inode *nfsi = NFS_I(state->inode); 2066 struct nfs_open_context *ctx; 2067 2068 rcu_read_lock(); 2069 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2070 if (ctx->state != state) 2071 continue; 2072 if ((ctx->mode & mode) != mode) 2073 continue; 2074 if (!get_nfs_open_context(ctx)) 2075 continue; 2076 rcu_read_unlock(); 2077 return ctx; 2078 } 2079 rcu_read_unlock(); 2080 return ERR_PTR(-ENOENT); 2081 } 2082 2083 static struct nfs_open_context * 2084 nfs4_state_find_open_context(struct nfs4_state *state) 2085 { 2086 struct nfs_open_context *ctx; 2087 2088 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2089 if (!IS_ERR(ctx)) 2090 return ctx; 2091 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2092 if (!IS_ERR(ctx)) 2093 return ctx; 2094 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2095 } 2096 2097 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2098 struct nfs4_state *state, enum open_claim_type4 claim) 2099 { 2100 struct nfs4_opendata *opendata; 2101 2102 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2103 NULL, claim, GFP_NOFS); 2104 if (opendata == NULL) 2105 return ERR_PTR(-ENOMEM); 2106 opendata->state = state; 2107 refcount_inc(&state->count); 2108 return opendata; 2109 } 2110 2111 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2112 fmode_t fmode) 2113 { 2114 struct nfs4_state *newstate; 2115 int ret; 2116 2117 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2118 return 0; 2119 opendata->o_arg.open_flags = 0; 2120 opendata->o_arg.fmode = fmode; 2121 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 2122 NFS_SB(opendata->dentry->d_sb), 2123 fmode, 0); 2124 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2125 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2126 nfs4_init_opendata_res(opendata); 2127 ret = _nfs4_recover_proc_open(opendata); 2128 if (ret != 0) 2129 return ret; 2130 newstate = nfs4_opendata_to_nfs4_state(opendata); 2131 if (IS_ERR(newstate)) 2132 return PTR_ERR(newstate); 2133 if (newstate != opendata->state) 2134 ret = -ESTALE; 2135 nfs4_close_state(newstate, fmode); 2136 return ret; 2137 } 2138 2139 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2140 { 2141 int ret; 2142 2143 /* memory barrier prior to reading state->n_* */ 2144 smp_rmb(); 2145 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2146 if (ret != 0) 2147 return ret; 2148 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2149 if (ret != 0) 2150 return ret; 2151 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2152 if (ret != 0) 2153 return ret; 2154 /* 2155 * We may have performed cached opens for all three recoveries. 2156 * Check if we need to update the current stateid. 2157 */ 2158 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2159 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2160 write_seqlock(&state->seqlock); 2161 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2162 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2163 write_sequnlock(&state->seqlock); 2164 } 2165 return 0; 2166 } 2167 2168 /* 2169 * OPEN_RECLAIM: 2170 * reclaim state on the server after a reboot. 2171 */ 2172 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2173 { 2174 struct nfs_delegation *delegation; 2175 struct nfs4_opendata *opendata; 2176 fmode_t delegation_type = 0; 2177 int status; 2178 2179 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2180 NFS4_OPEN_CLAIM_PREVIOUS); 2181 if (IS_ERR(opendata)) 2182 return PTR_ERR(opendata); 2183 rcu_read_lock(); 2184 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2185 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2186 delegation_type = delegation->type; 2187 rcu_read_unlock(); 2188 opendata->o_arg.u.delegation_type = delegation_type; 2189 status = nfs4_open_recover(opendata, state); 2190 nfs4_opendata_put(opendata); 2191 return status; 2192 } 2193 2194 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2195 { 2196 struct nfs_server *server = NFS_SERVER(state->inode); 2197 struct nfs4_exception exception = { }; 2198 int err; 2199 do { 2200 err = _nfs4_do_open_reclaim(ctx, state); 2201 trace_nfs4_open_reclaim(ctx, 0, err); 2202 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2203 continue; 2204 if (err != -NFS4ERR_DELAY) 2205 break; 2206 nfs4_handle_exception(server, err, &exception); 2207 } while (exception.retry); 2208 return err; 2209 } 2210 2211 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2212 { 2213 struct nfs_open_context *ctx; 2214 int ret; 2215 2216 ctx = nfs4_state_find_open_context(state); 2217 if (IS_ERR(ctx)) 2218 return -EAGAIN; 2219 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2220 nfs_state_clear_open_state_flags(state); 2221 ret = nfs4_do_open_reclaim(ctx, state); 2222 put_nfs_open_context(ctx); 2223 return ret; 2224 } 2225 2226 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) 2227 { 2228 switch (err) { 2229 default: 2230 printk(KERN_ERR "NFS: %s: unhandled error " 2231 "%d.\n", __func__, err); 2232 case 0: 2233 case -ENOENT: 2234 case -EAGAIN: 2235 case -ESTALE: 2236 case -ETIMEDOUT: 2237 break; 2238 case -NFS4ERR_BADSESSION: 2239 case -NFS4ERR_BADSLOT: 2240 case -NFS4ERR_BAD_HIGH_SLOT: 2241 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2242 case -NFS4ERR_DEADSESSION: 2243 return -EAGAIN; 2244 case -NFS4ERR_STALE_CLIENTID: 2245 case -NFS4ERR_STALE_STATEID: 2246 /* Don't recall a delegation if it was lost */ 2247 nfs4_schedule_lease_recovery(server->nfs_client); 2248 return -EAGAIN; 2249 case -NFS4ERR_MOVED: 2250 nfs4_schedule_migration_recovery(server); 2251 return -EAGAIN; 2252 case -NFS4ERR_LEASE_MOVED: 2253 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2254 return -EAGAIN; 2255 case -NFS4ERR_DELEG_REVOKED: 2256 case -NFS4ERR_ADMIN_REVOKED: 2257 case -NFS4ERR_EXPIRED: 2258 case -NFS4ERR_BAD_STATEID: 2259 case -NFS4ERR_OPENMODE: 2260 nfs_inode_find_state_and_recover(state->inode, 2261 stateid); 2262 nfs4_schedule_stateid_recovery(server, state); 2263 return -EAGAIN; 2264 case -NFS4ERR_DELAY: 2265 case -NFS4ERR_GRACE: 2266 ssleep(1); 2267 return -EAGAIN; 2268 case -ENOMEM: 2269 case -NFS4ERR_DENIED: 2270 if (fl) { 2271 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2272 if (lsp) 2273 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2274 } 2275 return 0; 2276 } 2277 return err; 2278 } 2279 2280 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2281 struct nfs4_state *state, const nfs4_stateid *stateid) 2282 { 2283 struct nfs_server *server = NFS_SERVER(state->inode); 2284 struct nfs4_opendata *opendata; 2285 int err = 0; 2286 2287 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2288 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2289 if (IS_ERR(opendata)) 2290 return PTR_ERR(opendata); 2291 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2292 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2293 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2294 if (err) 2295 goto out; 2296 } 2297 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2298 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2299 if (err) 2300 goto out; 2301 } 2302 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2303 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2304 if (err) 2305 goto out; 2306 } 2307 nfs_state_clear_delegation(state); 2308 out: 2309 nfs4_opendata_put(opendata); 2310 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2311 } 2312 2313 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2314 { 2315 struct nfs4_opendata *data = calldata; 2316 2317 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2318 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2319 } 2320 2321 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2322 { 2323 struct nfs4_opendata *data = calldata; 2324 2325 nfs40_sequence_done(task, &data->c_res.seq_res); 2326 2327 data->rpc_status = task->tk_status; 2328 if (data->rpc_status == 0) { 2329 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2330 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2331 renew_lease(data->o_res.server, data->timestamp); 2332 data->rpc_done = true; 2333 } 2334 } 2335 2336 static void nfs4_open_confirm_release(void *calldata) 2337 { 2338 struct nfs4_opendata *data = calldata; 2339 struct nfs4_state *state = NULL; 2340 2341 /* If this request hasn't been cancelled, do nothing */ 2342 if (!data->cancelled) 2343 goto out_free; 2344 /* In case of error, no cleanup! */ 2345 if (!data->rpc_done) 2346 goto out_free; 2347 state = nfs4_opendata_to_nfs4_state(data); 2348 if (!IS_ERR(state)) 2349 nfs4_close_state(state, data->o_arg.fmode); 2350 out_free: 2351 nfs4_opendata_put(data); 2352 } 2353 2354 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2355 .rpc_call_prepare = nfs4_open_confirm_prepare, 2356 .rpc_call_done = nfs4_open_confirm_done, 2357 .rpc_release = nfs4_open_confirm_release, 2358 }; 2359 2360 /* 2361 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2362 */ 2363 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2364 { 2365 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2366 struct rpc_task *task; 2367 struct rpc_message msg = { 2368 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2369 .rpc_argp = &data->c_arg, 2370 .rpc_resp = &data->c_res, 2371 .rpc_cred = data->owner->so_cred, 2372 }; 2373 struct rpc_task_setup task_setup_data = { 2374 .rpc_client = server->client, 2375 .rpc_message = &msg, 2376 .callback_ops = &nfs4_open_confirm_ops, 2377 .callback_data = data, 2378 .workqueue = nfsiod_workqueue, 2379 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2380 }; 2381 int status; 2382 2383 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2384 data->is_recover); 2385 kref_get(&data->kref); 2386 data->rpc_done = false; 2387 data->rpc_status = 0; 2388 data->timestamp = jiffies; 2389 task = rpc_run_task(&task_setup_data); 2390 if (IS_ERR(task)) 2391 return PTR_ERR(task); 2392 status = rpc_wait_for_completion_task(task); 2393 if (status != 0) { 2394 data->cancelled = true; 2395 smp_wmb(); 2396 } else 2397 status = data->rpc_status; 2398 rpc_put_task(task); 2399 return status; 2400 } 2401 2402 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2403 { 2404 struct nfs4_opendata *data = calldata; 2405 struct nfs4_state_owner *sp = data->owner; 2406 struct nfs_client *clp = sp->so_server->nfs_client; 2407 enum open_claim_type4 claim = data->o_arg.claim; 2408 2409 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2410 goto out_wait; 2411 /* 2412 * Check if we still need to send an OPEN call, or if we can use 2413 * a delegation instead. 2414 */ 2415 if (data->state != NULL) { 2416 struct nfs_delegation *delegation; 2417 2418 if (can_open_cached(data->state, data->o_arg.fmode, 2419 data->o_arg.open_flags, claim)) 2420 goto out_no_action; 2421 rcu_read_lock(); 2422 delegation = nfs4_get_valid_delegation(data->state->inode); 2423 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2424 goto unlock_no_action; 2425 rcu_read_unlock(); 2426 } 2427 /* Update client id. */ 2428 data->o_arg.clientid = clp->cl_clientid; 2429 switch (claim) { 2430 default: 2431 break; 2432 case NFS4_OPEN_CLAIM_PREVIOUS: 2433 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2434 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2435 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2436 fallthrough; 2437 case NFS4_OPEN_CLAIM_FH: 2438 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2439 } 2440 data->timestamp = jiffies; 2441 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2442 &data->o_arg.seq_args, 2443 &data->o_res.seq_res, 2444 task) != 0) 2445 nfs_release_seqid(data->o_arg.seqid); 2446 2447 /* Set the create mode (note dependency on the session type) */ 2448 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2449 if (data->o_arg.open_flags & O_EXCL) { 2450 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2451 if (nfs4_has_persistent_session(clp)) 2452 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2453 else if (clp->cl_mvops->minor_version > 0) 2454 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2455 } 2456 return; 2457 unlock_no_action: 2458 trace_nfs4_cached_open(data->state); 2459 rcu_read_unlock(); 2460 out_no_action: 2461 task->tk_action = NULL; 2462 out_wait: 2463 nfs4_sequence_done(task, &data->o_res.seq_res); 2464 } 2465 2466 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2467 { 2468 struct nfs4_opendata *data = calldata; 2469 2470 data->rpc_status = task->tk_status; 2471 2472 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2473 return; 2474 2475 if (task->tk_status == 0) { 2476 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2477 switch (data->o_res.f_attr->mode & S_IFMT) { 2478 case S_IFREG: 2479 break; 2480 case S_IFLNK: 2481 data->rpc_status = -ELOOP; 2482 break; 2483 case S_IFDIR: 2484 data->rpc_status = -EISDIR; 2485 break; 2486 default: 2487 data->rpc_status = -ENOTDIR; 2488 } 2489 } 2490 renew_lease(data->o_res.server, data->timestamp); 2491 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2492 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2493 } 2494 data->rpc_done = true; 2495 } 2496 2497 static void nfs4_open_release(void *calldata) 2498 { 2499 struct nfs4_opendata *data = calldata; 2500 struct nfs4_state *state = NULL; 2501 2502 /* If this request hasn't been cancelled, do nothing */ 2503 if (!data->cancelled) 2504 goto out_free; 2505 /* In case of error, no cleanup! */ 2506 if (data->rpc_status != 0 || !data->rpc_done) 2507 goto out_free; 2508 /* In case we need an open_confirm, no cleanup! */ 2509 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2510 goto out_free; 2511 state = nfs4_opendata_to_nfs4_state(data); 2512 if (!IS_ERR(state)) 2513 nfs4_close_state(state, data->o_arg.fmode); 2514 out_free: 2515 nfs4_opendata_put(data); 2516 } 2517 2518 static const struct rpc_call_ops nfs4_open_ops = { 2519 .rpc_call_prepare = nfs4_open_prepare, 2520 .rpc_call_done = nfs4_open_done, 2521 .rpc_release = nfs4_open_release, 2522 }; 2523 2524 static int nfs4_run_open_task(struct nfs4_opendata *data, 2525 struct nfs_open_context *ctx) 2526 { 2527 struct inode *dir = d_inode(data->dir); 2528 struct nfs_server *server = NFS_SERVER(dir); 2529 struct nfs_openargs *o_arg = &data->o_arg; 2530 struct nfs_openres *o_res = &data->o_res; 2531 struct rpc_task *task; 2532 struct rpc_message msg = { 2533 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2534 .rpc_argp = o_arg, 2535 .rpc_resp = o_res, 2536 .rpc_cred = data->owner->so_cred, 2537 }; 2538 struct rpc_task_setup task_setup_data = { 2539 .rpc_client = server->client, 2540 .rpc_message = &msg, 2541 .callback_ops = &nfs4_open_ops, 2542 .callback_data = data, 2543 .workqueue = nfsiod_workqueue, 2544 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2545 }; 2546 int status; 2547 2548 kref_get(&data->kref); 2549 data->rpc_done = false; 2550 data->rpc_status = 0; 2551 data->cancelled = false; 2552 data->is_recover = false; 2553 if (!ctx) { 2554 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2555 data->is_recover = true; 2556 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2557 } else { 2558 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2559 pnfs_lgopen_prepare(data, ctx); 2560 } 2561 task = rpc_run_task(&task_setup_data); 2562 if (IS_ERR(task)) 2563 return PTR_ERR(task); 2564 status = rpc_wait_for_completion_task(task); 2565 if (status != 0) { 2566 data->cancelled = true; 2567 smp_wmb(); 2568 } else 2569 status = data->rpc_status; 2570 rpc_put_task(task); 2571 2572 return status; 2573 } 2574 2575 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2576 { 2577 struct inode *dir = d_inode(data->dir); 2578 struct nfs_openres *o_res = &data->o_res; 2579 int status; 2580 2581 status = nfs4_run_open_task(data, NULL); 2582 if (status != 0 || !data->rpc_done) 2583 return status; 2584 2585 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2586 2587 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2588 status = _nfs4_proc_open_confirm(data); 2589 2590 return status; 2591 } 2592 2593 /* 2594 * Additional permission checks in order to distinguish between an 2595 * open for read, and an open for execute. This works around the 2596 * fact that NFSv4 OPEN treats read and execute permissions as being 2597 * the same. 2598 * Note that in the non-execute case, we want to turn off permission 2599 * checking if we just created a new file (POSIX open() semantics). 2600 */ 2601 static int nfs4_opendata_access(const struct cred *cred, 2602 struct nfs4_opendata *opendata, 2603 struct nfs4_state *state, fmode_t fmode, 2604 int openflags) 2605 { 2606 struct nfs_access_entry cache; 2607 u32 mask, flags; 2608 2609 /* access call failed or for some reason the server doesn't 2610 * support any access modes -- defer access call until later */ 2611 if (opendata->o_res.access_supported == 0) 2612 return 0; 2613 2614 mask = 0; 2615 /* 2616 * Use openflags to check for exec, because fmode won't 2617 * always have FMODE_EXEC set when file open for exec. 2618 */ 2619 if (openflags & __FMODE_EXEC) { 2620 /* ONLY check for exec rights */ 2621 if (S_ISDIR(state->inode->i_mode)) 2622 mask = NFS4_ACCESS_LOOKUP; 2623 else 2624 mask = NFS4_ACCESS_EXECUTE; 2625 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2626 mask = NFS4_ACCESS_READ; 2627 2628 cache.cred = cred; 2629 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2630 nfs_access_add_cache(state->inode, &cache); 2631 2632 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2633 if ((mask & ~cache.mask & flags) == 0) 2634 return 0; 2635 2636 return -EACCES; 2637 } 2638 2639 /* 2640 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2641 */ 2642 static int _nfs4_proc_open(struct nfs4_opendata *data, 2643 struct nfs_open_context *ctx) 2644 { 2645 struct inode *dir = d_inode(data->dir); 2646 struct nfs_server *server = NFS_SERVER(dir); 2647 struct nfs_openargs *o_arg = &data->o_arg; 2648 struct nfs_openres *o_res = &data->o_res; 2649 int status; 2650 2651 status = nfs4_run_open_task(data, ctx); 2652 if (!data->rpc_done) 2653 return status; 2654 if (status != 0) { 2655 if (status == -NFS4ERR_BADNAME && 2656 !(o_arg->open_flags & O_CREAT)) 2657 return -ENOENT; 2658 return status; 2659 } 2660 2661 nfs_fattr_map_and_free_names(server, &data->f_attr); 2662 2663 if (o_arg->open_flags & O_CREAT) { 2664 if (o_arg->open_flags & O_EXCL) 2665 data->file_created = true; 2666 else if (o_res->cinfo.before != o_res->cinfo.after) 2667 data->file_created = true; 2668 if (data->file_created || 2669 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2670 nfs4_update_changeattr(dir, &o_res->cinfo, 2671 o_res->f_attr->time_start, 2672 NFS_INO_INVALID_DATA); 2673 } 2674 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2675 server->caps &= ~NFS_CAP_POSIX_LOCK; 2676 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2677 status = _nfs4_proc_open_confirm(data); 2678 if (status != 0) 2679 return status; 2680 } 2681 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2682 nfs4_sequence_free_slot(&o_res->seq_res); 2683 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, 2684 o_res->f_label, NULL); 2685 } 2686 return 0; 2687 } 2688 2689 /* 2690 * OPEN_EXPIRED: 2691 * reclaim state on the server after a network partition. 2692 * Assumes caller holds the appropriate lock 2693 */ 2694 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2695 { 2696 struct nfs4_opendata *opendata; 2697 int ret; 2698 2699 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2700 NFS4_OPEN_CLAIM_FH); 2701 if (IS_ERR(opendata)) 2702 return PTR_ERR(opendata); 2703 ret = nfs4_open_recover(opendata, state); 2704 if (ret == -ESTALE) 2705 d_drop(ctx->dentry); 2706 nfs4_opendata_put(opendata); 2707 return ret; 2708 } 2709 2710 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2711 { 2712 struct nfs_server *server = NFS_SERVER(state->inode); 2713 struct nfs4_exception exception = { }; 2714 int err; 2715 2716 do { 2717 err = _nfs4_open_expired(ctx, state); 2718 trace_nfs4_open_expired(ctx, 0, err); 2719 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2720 continue; 2721 switch (err) { 2722 default: 2723 goto out; 2724 case -NFS4ERR_GRACE: 2725 case -NFS4ERR_DELAY: 2726 nfs4_handle_exception(server, err, &exception); 2727 err = 0; 2728 } 2729 } while (exception.retry); 2730 out: 2731 return err; 2732 } 2733 2734 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2735 { 2736 struct nfs_open_context *ctx; 2737 int ret; 2738 2739 ctx = nfs4_state_find_open_context(state); 2740 if (IS_ERR(ctx)) 2741 return -EAGAIN; 2742 ret = nfs4_do_open_expired(ctx, state); 2743 put_nfs_open_context(ctx); 2744 return ret; 2745 } 2746 2747 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2748 const nfs4_stateid *stateid) 2749 { 2750 nfs_remove_bad_delegation(state->inode, stateid); 2751 nfs_state_clear_delegation(state); 2752 } 2753 2754 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2755 { 2756 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2757 nfs_finish_clear_delegation_stateid(state, NULL); 2758 } 2759 2760 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2761 { 2762 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2763 nfs40_clear_delegation_stateid(state); 2764 nfs_state_clear_open_state_flags(state); 2765 return nfs4_open_expired(sp, state); 2766 } 2767 2768 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2769 nfs4_stateid *stateid, 2770 const struct cred *cred) 2771 { 2772 return -NFS4ERR_BAD_STATEID; 2773 } 2774 2775 #if defined(CONFIG_NFS_V4_1) 2776 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2777 nfs4_stateid *stateid, 2778 const struct cred *cred) 2779 { 2780 int status; 2781 2782 switch (stateid->type) { 2783 default: 2784 break; 2785 case NFS4_INVALID_STATEID_TYPE: 2786 case NFS4_SPECIAL_STATEID_TYPE: 2787 return -NFS4ERR_BAD_STATEID; 2788 case NFS4_REVOKED_STATEID_TYPE: 2789 goto out_free; 2790 } 2791 2792 status = nfs41_test_stateid(server, stateid, cred); 2793 switch (status) { 2794 case -NFS4ERR_EXPIRED: 2795 case -NFS4ERR_ADMIN_REVOKED: 2796 case -NFS4ERR_DELEG_REVOKED: 2797 break; 2798 default: 2799 return status; 2800 } 2801 out_free: 2802 /* Ack the revoked state to the server */ 2803 nfs41_free_stateid(server, stateid, cred, true); 2804 return -NFS4ERR_EXPIRED; 2805 } 2806 2807 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2808 { 2809 struct nfs_server *server = NFS_SERVER(state->inode); 2810 nfs4_stateid stateid; 2811 struct nfs_delegation *delegation; 2812 const struct cred *cred = NULL; 2813 int status, ret = NFS_OK; 2814 2815 /* Get the delegation credential for use by test/free_stateid */ 2816 rcu_read_lock(); 2817 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2818 if (delegation == NULL) { 2819 rcu_read_unlock(); 2820 nfs_state_clear_delegation(state); 2821 return NFS_OK; 2822 } 2823 2824 spin_lock(&delegation->lock); 2825 nfs4_stateid_copy(&stateid, &delegation->stateid); 2826 2827 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2828 &delegation->flags)) { 2829 spin_unlock(&delegation->lock); 2830 rcu_read_unlock(); 2831 return NFS_OK; 2832 } 2833 2834 if (delegation->cred) 2835 cred = get_cred(delegation->cred); 2836 spin_unlock(&delegation->lock); 2837 rcu_read_unlock(); 2838 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2839 trace_nfs4_test_delegation_stateid(state, NULL, status); 2840 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2841 nfs_finish_clear_delegation_stateid(state, &stateid); 2842 else 2843 ret = status; 2844 2845 put_cred(cred); 2846 return ret; 2847 } 2848 2849 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2850 { 2851 nfs4_stateid tmp; 2852 2853 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2854 nfs4_copy_delegation_stateid(state->inode, state->state, 2855 &tmp, NULL) && 2856 nfs4_stateid_match_other(&state->stateid, &tmp)) 2857 nfs_state_set_delegation(state, &tmp, state->state); 2858 else 2859 nfs_state_clear_delegation(state); 2860 } 2861 2862 /** 2863 * nfs41_check_expired_locks - possibly free a lock stateid 2864 * 2865 * @state: NFSv4 state for an inode 2866 * 2867 * Returns NFS_OK if recovery for this stateid is now finished. 2868 * Otherwise a negative NFS4ERR value is returned. 2869 */ 2870 static int nfs41_check_expired_locks(struct nfs4_state *state) 2871 { 2872 int status, ret = NFS_OK; 2873 struct nfs4_lock_state *lsp, *prev = NULL; 2874 struct nfs_server *server = NFS_SERVER(state->inode); 2875 2876 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2877 goto out; 2878 2879 spin_lock(&state->state_lock); 2880 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2881 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2882 const struct cred *cred = lsp->ls_state->owner->so_cred; 2883 2884 refcount_inc(&lsp->ls_count); 2885 spin_unlock(&state->state_lock); 2886 2887 nfs4_put_lock_state(prev); 2888 prev = lsp; 2889 2890 status = nfs41_test_and_free_expired_stateid(server, 2891 &lsp->ls_stateid, 2892 cred); 2893 trace_nfs4_test_lock_stateid(state, lsp, status); 2894 if (status == -NFS4ERR_EXPIRED || 2895 status == -NFS4ERR_BAD_STATEID) { 2896 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2897 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2898 if (!recover_lost_locks) 2899 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2900 } else if (status != NFS_OK) { 2901 ret = status; 2902 nfs4_put_lock_state(prev); 2903 goto out; 2904 } 2905 spin_lock(&state->state_lock); 2906 } 2907 } 2908 spin_unlock(&state->state_lock); 2909 nfs4_put_lock_state(prev); 2910 out: 2911 return ret; 2912 } 2913 2914 /** 2915 * nfs41_check_open_stateid - possibly free an open stateid 2916 * 2917 * @state: NFSv4 state for an inode 2918 * 2919 * Returns NFS_OK if recovery for this stateid is now finished. 2920 * Otherwise a negative NFS4ERR value is returned. 2921 */ 2922 static int nfs41_check_open_stateid(struct nfs4_state *state) 2923 { 2924 struct nfs_server *server = NFS_SERVER(state->inode); 2925 nfs4_stateid *stateid = &state->open_stateid; 2926 const struct cred *cred = state->owner->so_cred; 2927 int status; 2928 2929 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2930 return -NFS4ERR_BAD_STATEID; 2931 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2932 trace_nfs4_test_open_stateid(state, NULL, status); 2933 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2934 nfs_state_clear_open_state_flags(state); 2935 stateid->type = NFS4_INVALID_STATEID_TYPE; 2936 return status; 2937 } 2938 if (nfs_open_stateid_recover_openmode(state)) 2939 return -NFS4ERR_OPENMODE; 2940 return NFS_OK; 2941 } 2942 2943 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2944 { 2945 int status; 2946 2947 status = nfs41_check_delegation_stateid(state); 2948 if (status != NFS_OK) 2949 return status; 2950 nfs41_delegation_recover_stateid(state); 2951 2952 status = nfs41_check_expired_locks(state); 2953 if (status != NFS_OK) 2954 return status; 2955 status = nfs41_check_open_stateid(state); 2956 if (status != NFS_OK) 2957 status = nfs4_open_expired(sp, state); 2958 return status; 2959 } 2960 #endif 2961 2962 /* 2963 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2964 * fields corresponding to attributes that were used to store the verifier. 2965 * Make sure we clobber those fields in the later setattr call 2966 */ 2967 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2968 struct iattr *sattr, struct nfs4_label **label) 2969 { 2970 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2971 __u32 attrset[3]; 2972 unsigned ret; 2973 unsigned i; 2974 2975 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 2976 attrset[i] = opendata->o_res.attrset[i]; 2977 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 2978 attrset[i] &= ~bitmask[i]; 2979 } 2980 2981 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 2982 sattr->ia_valid : 0; 2983 2984 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 2985 if (sattr->ia_valid & ATTR_ATIME_SET) 2986 ret |= ATTR_ATIME_SET; 2987 else 2988 ret |= ATTR_ATIME; 2989 } 2990 2991 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 2992 if (sattr->ia_valid & ATTR_MTIME_SET) 2993 ret |= ATTR_MTIME_SET; 2994 else 2995 ret |= ATTR_MTIME; 2996 } 2997 2998 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 2999 *label = NULL; 3000 return ret; 3001 } 3002 3003 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3004 int flags, struct nfs_open_context *ctx) 3005 { 3006 struct nfs4_state_owner *sp = opendata->owner; 3007 struct nfs_server *server = sp->so_server; 3008 struct dentry *dentry; 3009 struct nfs4_state *state; 3010 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3011 struct inode *dir = d_inode(opendata->dir); 3012 unsigned long dir_verifier; 3013 unsigned int seq; 3014 int ret; 3015 3016 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3017 dir_verifier = nfs_save_change_attribute(dir); 3018 3019 ret = _nfs4_proc_open(opendata, ctx); 3020 if (ret != 0) 3021 goto out; 3022 3023 state = _nfs4_opendata_to_nfs4_state(opendata); 3024 ret = PTR_ERR(state); 3025 if (IS_ERR(state)) 3026 goto out; 3027 ctx->state = state; 3028 if (server->caps & NFS_CAP_POSIX_LOCK) 3029 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3030 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3031 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3032 3033 dentry = opendata->dentry; 3034 if (d_really_is_negative(dentry)) { 3035 struct dentry *alias; 3036 d_drop(dentry); 3037 alias = d_exact_alias(dentry, state->inode); 3038 if (!alias) 3039 alias = d_splice_alias(igrab(state->inode), dentry); 3040 /* d_splice_alias() can't fail here - it's a non-directory */ 3041 if (alias) { 3042 dput(ctx->dentry); 3043 ctx->dentry = dentry = alias; 3044 } 3045 } 3046 3047 switch(opendata->o_arg.claim) { 3048 default: 3049 break; 3050 case NFS4_OPEN_CLAIM_NULL: 3051 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3052 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3053 if (!opendata->rpc_done) 3054 break; 3055 if (opendata->o_res.delegation_type != 0) 3056 dir_verifier = nfs_save_change_attribute(dir); 3057 nfs_set_verifier(dentry, dir_verifier); 3058 } 3059 3060 /* Parse layoutget results before we check for access */ 3061 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3062 3063 ret = nfs4_opendata_access(sp->so_cred, opendata, state, 3064 acc_mode, flags); 3065 if (ret != 0) 3066 goto out; 3067 3068 if (d_inode(dentry) == state->inode) { 3069 nfs_inode_attach_open_context(ctx); 3070 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3071 nfs4_schedule_stateid_recovery(server, state); 3072 } 3073 3074 out: 3075 if (!opendata->cancelled) 3076 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3077 return ret; 3078 } 3079 3080 /* 3081 * Returns a referenced nfs4_state 3082 */ 3083 static int _nfs4_do_open(struct inode *dir, 3084 struct nfs_open_context *ctx, 3085 int flags, 3086 const struct nfs4_open_createattrs *c, 3087 int *opened) 3088 { 3089 struct nfs4_state_owner *sp; 3090 struct nfs4_state *state = NULL; 3091 struct nfs_server *server = NFS_SERVER(dir); 3092 struct nfs4_opendata *opendata; 3093 struct dentry *dentry = ctx->dentry; 3094 const struct cred *cred = ctx->cred; 3095 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3096 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3097 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3098 struct iattr *sattr = c->sattr; 3099 struct nfs4_label *label = c->label; 3100 struct nfs4_label *olabel = NULL; 3101 int status; 3102 3103 /* Protect against reboot recovery conflicts */ 3104 status = -ENOMEM; 3105 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3106 if (sp == NULL) { 3107 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3108 goto out_err; 3109 } 3110 status = nfs4_client_recover_expired_lease(server->nfs_client); 3111 if (status != 0) 3112 goto err_put_state_owner; 3113 if (d_really_is_positive(dentry)) 3114 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3115 status = -ENOMEM; 3116 if (d_really_is_positive(dentry)) 3117 claim = NFS4_OPEN_CLAIM_FH; 3118 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3119 c, claim, GFP_KERNEL); 3120 if (opendata == NULL) 3121 goto err_put_state_owner; 3122 3123 if (label) { 3124 olabel = nfs4_label_alloc(server, GFP_KERNEL); 3125 if (IS_ERR(olabel)) { 3126 status = PTR_ERR(olabel); 3127 goto err_opendata_put; 3128 } 3129 } 3130 3131 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3132 if (!opendata->f_attr.mdsthreshold) { 3133 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3134 if (!opendata->f_attr.mdsthreshold) 3135 goto err_free_label; 3136 } 3137 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3138 } 3139 if (d_really_is_positive(dentry)) 3140 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3141 3142 status = _nfs4_open_and_get_state(opendata, flags, ctx); 3143 if (status != 0) 3144 goto err_free_label; 3145 state = ctx->state; 3146 3147 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3148 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3149 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3150 /* 3151 * send create attributes which was not set by open 3152 * with an extra setattr. 3153 */ 3154 if (attrs || label) { 3155 unsigned ia_old = sattr->ia_valid; 3156 3157 sattr->ia_valid = attrs; 3158 nfs_fattr_init(opendata->o_res.f_attr); 3159 status = nfs4_do_setattr(state->inode, cred, 3160 opendata->o_res.f_attr, sattr, 3161 ctx, label, olabel); 3162 if (status == 0) { 3163 nfs_setattr_update_inode(state->inode, sattr, 3164 opendata->o_res.f_attr); 3165 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 3166 } 3167 sattr->ia_valid = ia_old; 3168 } 3169 } 3170 if (opened && opendata->file_created) 3171 *opened = 1; 3172 3173 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3174 *ctx_th = opendata->f_attr.mdsthreshold; 3175 opendata->f_attr.mdsthreshold = NULL; 3176 } 3177 3178 nfs4_label_free(olabel); 3179 3180 nfs4_opendata_put(opendata); 3181 nfs4_put_state_owner(sp); 3182 return 0; 3183 err_free_label: 3184 nfs4_label_free(olabel); 3185 err_opendata_put: 3186 nfs4_opendata_put(opendata); 3187 err_put_state_owner: 3188 nfs4_put_state_owner(sp); 3189 out_err: 3190 return status; 3191 } 3192 3193 3194 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3195 struct nfs_open_context *ctx, 3196 int flags, 3197 struct iattr *sattr, 3198 struct nfs4_label *label, 3199 int *opened) 3200 { 3201 struct nfs_server *server = NFS_SERVER(dir); 3202 struct nfs4_exception exception = { 3203 .interruptible = true, 3204 }; 3205 struct nfs4_state *res; 3206 struct nfs4_open_createattrs c = { 3207 .label = label, 3208 .sattr = sattr, 3209 .verf = { 3210 [0] = (__u32)jiffies, 3211 [1] = (__u32)current->pid, 3212 }, 3213 }; 3214 int status; 3215 3216 do { 3217 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3218 res = ctx->state; 3219 trace_nfs4_open_file(ctx, flags, status); 3220 if (status == 0) 3221 break; 3222 /* NOTE: BAD_SEQID means the server and client disagree about the 3223 * book-keeping w.r.t. state-changing operations 3224 * (OPEN/CLOSE/LOCK/LOCKU...) 3225 * It is actually a sign of a bug on the client or on the server. 3226 * 3227 * If we receive a BAD_SEQID error in the particular case of 3228 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3229 * have unhashed the old state_owner for us, and that we can 3230 * therefore safely retry using a new one. We should still warn 3231 * the user though... 3232 */ 3233 if (status == -NFS4ERR_BAD_SEQID) { 3234 pr_warn_ratelimited("NFS: v4 server %s " 3235 " returned a bad sequence-id error!\n", 3236 NFS_SERVER(dir)->nfs_client->cl_hostname); 3237 exception.retry = 1; 3238 continue; 3239 } 3240 /* 3241 * BAD_STATEID on OPEN means that the server cancelled our 3242 * state before it received the OPEN_CONFIRM. 3243 * Recover by retrying the request as per the discussion 3244 * on Page 181 of RFC3530. 3245 */ 3246 if (status == -NFS4ERR_BAD_STATEID) { 3247 exception.retry = 1; 3248 continue; 3249 } 3250 if (status == -NFS4ERR_EXPIRED) { 3251 nfs4_schedule_lease_recovery(server->nfs_client); 3252 exception.retry = 1; 3253 continue; 3254 } 3255 if (status == -EAGAIN) { 3256 /* We must have found a delegation */ 3257 exception.retry = 1; 3258 continue; 3259 } 3260 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3261 continue; 3262 res = ERR_PTR(nfs4_handle_exception(server, 3263 status, &exception)); 3264 } while (exception.retry); 3265 return res; 3266 } 3267 3268 static int _nfs4_do_setattr(struct inode *inode, 3269 struct nfs_setattrargs *arg, 3270 struct nfs_setattrres *res, 3271 const struct cred *cred, 3272 struct nfs_open_context *ctx) 3273 { 3274 struct nfs_server *server = NFS_SERVER(inode); 3275 struct rpc_message msg = { 3276 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3277 .rpc_argp = arg, 3278 .rpc_resp = res, 3279 .rpc_cred = cred, 3280 }; 3281 const struct cred *delegation_cred = NULL; 3282 unsigned long timestamp = jiffies; 3283 bool truncate; 3284 int status; 3285 3286 nfs_fattr_init(res->fattr); 3287 3288 /* Servers should only apply open mode checks for file size changes */ 3289 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3290 if (!truncate) { 3291 nfs4_inode_make_writeable(inode); 3292 goto zero_stateid; 3293 } 3294 3295 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3296 /* Use that stateid */ 3297 } else if (ctx != NULL && ctx->state) { 3298 struct nfs_lock_context *l_ctx; 3299 if (!nfs4_valid_open_stateid(ctx->state)) 3300 return -EBADF; 3301 l_ctx = nfs_get_lock_context(ctx); 3302 if (IS_ERR(l_ctx)) 3303 return PTR_ERR(l_ctx); 3304 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3305 &arg->stateid, &delegation_cred); 3306 nfs_put_lock_context(l_ctx); 3307 if (status == -EIO) 3308 return -EBADF; 3309 else if (status == -EAGAIN) 3310 goto zero_stateid; 3311 } else { 3312 zero_stateid: 3313 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3314 } 3315 if (delegation_cred) 3316 msg.rpc_cred = delegation_cred; 3317 3318 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3319 3320 put_cred(delegation_cred); 3321 if (status == 0 && ctx != NULL) 3322 renew_lease(server, timestamp); 3323 trace_nfs4_setattr(inode, &arg->stateid, status); 3324 return status; 3325 } 3326 3327 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3328 struct nfs_fattr *fattr, struct iattr *sattr, 3329 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 3330 struct nfs4_label *olabel) 3331 { 3332 struct nfs_server *server = NFS_SERVER(inode); 3333 __u32 bitmask[NFS4_BITMASK_SZ]; 3334 struct nfs4_state *state = ctx ? ctx->state : NULL; 3335 struct nfs_setattrargs arg = { 3336 .fh = NFS_FH(inode), 3337 .iap = sattr, 3338 .server = server, 3339 .bitmask = bitmask, 3340 .label = ilabel, 3341 }; 3342 struct nfs_setattrres res = { 3343 .fattr = fattr, 3344 .label = olabel, 3345 .server = server, 3346 }; 3347 struct nfs4_exception exception = { 3348 .state = state, 3349 .inode = inode, 3350 .stateid = &arg.stateid, 3351 }; 3352 int err; 3353 3354 do { 3355 nfs4_bitmap_copy_adjust_setattr(bitmask, 3356 nfs4_bitmask(server, olabel), 3357 inode); 3358 3359 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3360 switch (err) { 3361 case -NFS4ERR_OPENMODE: 3362 if (!(sattr->ia_valid & ATTR_SIZE)) { 3363 pr_warn_once("NFSv4: server %s is incorrectly " 3364 "applying open mode checks to " 3365 "a SETATTR that is not " 3366 "changing file size.\n", 3367 server->nfs_client->cl_hostname); 3368 } 3369 if (state && !(state->state & FMODE_WRITE)) { 3370 err = -EBADF; 3371 if (sattr->ia_valid & ATTR_OPEN) 3372 err = -EACCES; 3373 goto out; 3374 } 3375 } 3376 err = nfs4_handle_exception(server, err, &exception); 3377 } while (exception.retry); 3378 out: 3379 return err; 3380 } 3381 3382 static bool 3383 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3384 { 3385 if (inode == NULL || !nfs_have_layout(inode)) 3386 return false; 3387 3388 return pnfs_wait_on_layoutreturn(inode, task); 3389 } 3390 3391 /* 3392 * Update the seqid of an open stateid 3393 */ 3394 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3395 struct nfs4_state *state) 3396 { 3397 __be32 seqid_open; 3398 u32 dst_seqid; 3399 int seq; 3400 3401 for (;;) { 3402 if (!nfs4_valid_open_stateid(state)) 3403 break; 3404 seq = read_seqbegin(&state->seqlock); 3405 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3406 nfs4_stateid_copy(dst, &state->open_stateid); 3407 if (read_seqretry(&state->seqlock, seq)) 3408 continue; 3409 break; 3410 } 3411 seqid_open = state->open_stateid.seqid; 3412 if (read_seqretry(&state->seqlock, seq)) 3413 continue; 3414 3415 dst_seqid = be32_to_cpu(dst->seqid); 3416 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3417 dst->seqid = seqid_open; 3418 break; 3419 } 3420 } 3421 3422 /* 3423 * Update the seqid of an open stateid after receiving 3424 * NFS4ERR_OLD_STATEID 3425 */ 3426 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3427 struct nfs4_state *state) 3428 { 3429 __be32 seqid_open; 3430 u32 dst_seqid; 3431 bool ret; 3432 int seq, status = -EAGAIN; 3433 DEFINE_WAIT(wait); 3434 3435 for (;;) { 3436 ret = false; 3437 if (!nfs4_valid_open_stateid(state)) 3438 break; 3439 seq = read_seqbegin(&state->seqlock); 3440 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3441 if (read_seqretry(&state->seqlock, seq)) 3442 continue; 3443 break; 3444 } 3445 3446 write_seqlock(&state->seqlock); 3447 seqid_open = state->open_stateid.seqid; 3448 3449 dst_seqid = be32_to_cpu(dst->seqid); 3450 3451 /* Did another OPEN bump the state's seqid? try again: */ 3452 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3453 dst->seqid = seqid_open; 3454 write_sequnlock(&state->seqlock); 3455 ret = true; 3456 break; 3457 } 3458 3459 /* server says we're behind but we haven't seen the update yet */ 3460 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3461 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3462 write_sequnlock(&state->seqlock); 3463 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3464 3465 if (signal_pending(current)) 3466 status = -EINTR; 3467 else 3468 if (schedule_timeout(5*HZ) != 0) 3469 status = 0; 3470 3471 finish_wait(&state->waitq, &wait); 3472 3473 if (!status) 3474 continue; 3475 if (status == -EINTR) 3476 break; 3477 3478 /* we slept the whole 5 seconds, we must have lost a seqid */ 3479 dst->seqid = cpu_to_be32(dst_seqid + 1); 3480 ret = true; 3481 break; 3482 } 3483 3484 return ret; 3485 } 3486 3487 struct nfs4_closedata { 3488 struct inode *inode; 3489 struct nfs4_state *state; 3490 struct nfs_closeargs arg; 3491 struct nfs_closeres res; 3492 struct { 3493 struct nfs4_layoutreturn_args arg; 3494 struct nfs4_layoutreturn_res res; 3495 struct nfs4_xdr_opaque_data ld_private; 3496 u32 roc_barrier; 3497 bool roc; 3498 } lr; 3499 struct nfs_fattr fattr; 3500 unsigned long timestamp; 3501 }; 3502 3503 static void nfs4_free_closedata(void *data) 3504 { 3505 struct nfs4_closedata *calldata = data; 3506 struct nfs4_state_owner *sp = calldata->state->owner; 3507 struct super_block *sb = calldata->state->inode->i_sb; 3508 3509 if (calldata->lr.roc) 3510 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3511 calldata->res.lr_ret); 3512 nfs4_put_open_state(calldata->state); 3513 nfs_free_seqid(calldata->arg.seqid); 3514 nfs4_put_state_owner(sp); 3515 nfs_sb_deactive(sb); 3516 kfree(calldata); 3517 } 3518 3519 static void nfs4_close_done(struct rpc_task *task, void *data) 3520 { 3521 struct nfs4_closedata *calldata = data; 3522 struct nfs4_state *state = calldata->state; 3523 struct nfs_server *server = NFS_SERVER(calldata->inode); 3524 nfs4_stateid *res_stateid = NULL; 3525 struct nfs4_exception exception = { 3526 .state = state, 3527 .inode = calldata->inode, 3528 .stateid = &calldata->arg.stateid, 3529 }; 3530 3531 dprintk("%s: begin!\n", __func__); 3532 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3533 return; 3534 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3535 3536 /* Handle Layoutreturn errors */ 3537 if (pnfs_roc_done(task, calldata->inode, 3538 &calldata->arg.lr_args, 3539 &calldata->res.lr_res, 3540 &calldata->res.lr_ret) == -EAGAIN) 3541 goto out_restart; 3542 3543 /* hmm. we are done with the inode, and in the process of freeing 3544 * the state_owner. we keep this around to process errors 3545 */ 3546 switch (task->tk_status) { 3547 case 0: 3548 res_stateid = &calldata->res.stateid; 3549 renew_lease(server, calldata->timestamp); 3550 break; 3551 case -NFS4ERR_ACCESS: 3552 if (calldata->arg.bitmask != NULL) { 3553 calldata->arg.bitmask = NULL; 3554 calldata->res.fattr = NULL; 3555 goto out_restart; 3556 3557 } 3558 break; 3559 case -NFS4ERR_OLD_STATEID: 3560 /* Did we race with OPEN? */ 3561 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3562 state)) 3563 goto out_restart; 3564 goto out_release; 3565 case -NFS4ERR_ADMIN_REVOKED: 3566 case -NFS4ERR_STALE_STATEID: 3567 case -NFS4ERR_EXPIRED: 3568 nfs4_free_revoked_stateid(server, 3569 &calldata->arg.stateid, 3570 task->tk_msg.rpc_cred); 3571 fallthrough; 3572 case -NFS4ERR_BAD_STATEID: 3573 if (calldata->arg.fmode == 0) 3574 break; 3575 fallthrough; 3576 default: 3577 task->tk_status = nfs4_async_handle_exception(task, 3578 server, task->tk_status, &exception); 3579 if (exception.retry) 3580 goto out_restart; 3581 } 3582 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3583 res_stateid, calldata->arg.fmode); 3584 out_release: 3585 task->tk_status = 0; 3586 nfs_release_seqid(calldata->arg.seqid); 3587 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3588 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 3589 return; 3590 out_restart: 3591 task->tk_status = 0; 3592 rpc_restart_call_prepare(task); 3593 goto out_release; 3594 } 3595 3596 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3597 { 3598 struct nfs4_closedata *calldata = data; 3599 struct nfs4_state *state = calldata->state; 3600 struct inode *inode = calldata->inode; 3601 struct pnfs_layout_hdr *lo; 3602 bool is_rdonly, is_wronly, is_rdwr; 3603 int call_close = 0; 3604 3605 dprintk("%s: begin!\n", __func__); 3606 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3607 goto out_wait; 3608 3609 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3610 spin_lock(&state->owner->so_lock); 3611 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3612 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3613 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3614 /* Calculate the change in open mode */ 3615 calldata->arg.fmode = 0; 3616 if (state->n_rdwr == 0) { 3617 if (state->n_rdonly == 0) 3618 call_close |= is_rdonly; 3619 else if (is_rdonly) 3620 calldata->arg.fmode |= FMODE_READ; 3621 if (state->n_wronly == 0) 3622 call_close |= is_wronly; 3623 else if (is_wronly) 3624 calldata->arg.fmode |= FMODE_WRITE; 3625 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3626 call_close |= is_rdwr; 3627 } else if (is_rdwr) 3628 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3629 3630 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3631 if (!nfs4_valid_open_stateid(state)) 3632 call_close = 0; 3633 spin_unlock(&state->owner->so_lock); 3634 3635 if (!call_close) { 3636 /* Note: exit _without_ calling nfs4_close_done */ 3637 goto out_no_action; 3638 } 3639 3640 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3641 nfs_release_seqid(calldata->arg.seqid); 3642 goto out_wait; 3643 } 3644 3645 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3646 if (lo && !pnfs_layout_is_valid(lo)) { 3647 calldata->arg.lr_args = NULL; 3648 calldata->res.lr_res = NULL; 3649 } 3650 3651 if (calldata->arg.fmode == 0) 3652 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3653 3654 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3655 /* Close-to-open cache consistency revalidation */ 3656 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3657 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3658 nfs4_bitmask_adjust(calldata->arg.bitmask, inode, NFS_SERVER(inode), NULL); 3659 } else 3660 calldata->arg.bitmask = NULL; 3661 } 3662 3663 calldata->arg.share_access = 3664 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3665 calldata->arg.fmode, 0); 3666 3667 if (calldata->res.fattr == NULL) 3668 calldata->arg.bitmask = NULL; 3669 else if (calldata->arg.bitmask == NULL) 3670 calldata->res.fattr = NULL; 3671 calldata->timestamp = jiffies; 3672 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3673 &calldata->arg.seq_args, 3674 &calldata->res.seq_res, 3675 task) != 0) 3676 nfs_release_seqid(calldata->arg.seqid); 3677 dprintk("%s: done!\n", __func__); 3678 return; 3679 out_no_action: 3680 task->tk_action = NULL; 3681 out_wait: 3682 nfs4_sequence_done(task, &calldata->res.seq_res); 3683 } 3684 3685 static const struct rpc_call_ops nfs4_close_ops = { 3686 .rpc_call_prepare = nfs4_close_prepare, 3687 .rpc_call_done = nfs4_close_done, 3688 .rpc_release = nfs4_free_closedata, 3689 }; 3690 3691 /* 3692 * It is possible for data to be read/written from a mem-mapped file 3693 * after the sys_close call (which hits the vfs layer as a flush). 3694 * This means that we can't safely call nfsv4 close on a file until 3695 * the inode is cleared. This in turn means that we are not good 3696 * NFSv4 citizens - we do not indicate to the server to update the file's 3697 * share state even when we are done with one of the three share 3698 * stateid's in the inode. 3699 * 3700 * NOTE: Caller must be holding the sp->so_owner semaphore! 3701 */ 3702 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3703 { 3704 struct nfs_server *server = NFS_SERVER(state->inode); 3705 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3706 struct nfs4_closedata *calldata; 3707 struct nfs4_state_owner *sp = state->owner; 3708 struct rpc_task *task; 3709 struct rpc_message msg = { 3710 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3711 .rpc_cred = state->owner->so_cred, 3712 }; 3713 struct rpc_task_setup task_setup_data = { 3714 .rpc_client = server->client, 3715 .rpc_message = &msg, 3716 .callback_ops = &nfs4_close_ops, 3717 .workqueue = nfsiod_workqueue, 3718 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3719 }; 3720 int status = -ENOMEM; 3721 3722 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3723 &task_setup_data.rpc_client, &msg); 3724 3725 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3726 if (calldata == NULL) 3727 goto out; 3728 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3729 calldata->inode = state->inode; 3730 calldata->state = state; 3731 calldata->arg.fh = NFS_FH(state->inode); 3732 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3733 goto out_free_calldata; 3734 /* Serialization for the sequence id */ 3735 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3736 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3737 if (IS_ERR(calldata->arg.seqid)) 3738 goto out_free_calldata; 3739 nfs_fattr_init(&calldata->fattr); 3740 calldata->arg.fmode = 0; 3741 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3742 calldata->res.fattr = &calldata->fattr; 3743 calldata->res.seqid = calldata->arg.seqid; 3744 calldata->res.server = server; 3745 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3746 calldata->lr.roc = pnfs_roc(state->inode, 3747 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3748 if (calldata->lr.roc) { 3749 calldata->arg.lr_args = &calldata->lr.arg; 3750 calldata->res.lr_res = &calldata->lr.res; 3751 } 3752 nfs_sb_active(calldata->inode->i_sb); 3753 3754 msg.rpc_argp = &calldata->arg; 3755 msg.rpc_resp = &calldata->res; 3756 task_setup_data.callback_data = calldata; 3757 task = rpc_run_task(&task_setup_data); 3758 if (IS_ERR(task)) 3759 return PTR_ERR(task); 3760 status = 0; 3761 if (wait) 3762 status = rpc_wait_for_completion_task(task); 3763 rpc_put_task(task); 3764 return status; 3765 out_free_calldata: 3766 kfree(calldata); 3767 out: 3768 nfs4_put_open_state(state); 3769 nfs4_put_state_owner(sp); 3770 return status; 3771 } 3772 3773 static struct inode * 3774 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3775 int open_flags, struct iattr *attr, int *opened) 3776 { 3777 struct nfs4_state *state; 3778 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3779 3780 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3781 3782 /* Protect against concurrent sillydeletes */ 3783 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3784 3785 nfs4_label_release_security(label); 3786 3787 if (IS_ERR(state)) 3788 return ERR_CAST(state); 3789 return state->inode; 3790 } 3791 3792 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3793 { 3794 if (ctx->state == NULL) 3795 return; 3796 if (is_sync) 3797 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3798 else 3799 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3800 } 3801 3802 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3803 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3804 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3805 3806 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3807 { 3808 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3809 struct nfs4_server_caps_arg args = { 3810 .fhandle = fhandle, 3811 .bitmask = bitmask, 3812 }; 3813 struct nfs4_server_caps_res res = {}; 3814 struct rpc_message msg = { 3815 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3816 .rpc_argp = &args, 3817 .rpc_resp = &res, 3818 }; 3819 int status; 3820 int i; 3821 3822 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3823 FATTR4_WORD0_FH_EXPIRE_TYPE | 3824 FATTR4_WORD0_LINK_SUPPORT | 3825 FATTR4_WORD0_SYMLINK_SUPPORT | 3826 FATTR4_WORD0_ACLSUPPORT; 3827 if (minorversion) 3828 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3829 3830 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3831 if (status == 0) { 3832 /* Sanity check the server answers */ 3833 switch (minorversion) { 3834 case 0: 3835 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3836 res.attr_bitmask[2] = 0; 3837 break; 3838 case 1: 3839 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3840 break; 3841 case 2: 3842 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3843 } 3844 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3845 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3846 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3847 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3848 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3849 NFS_CAP_CTIME|NFS_CAP_MTIME| 3850 NFS_CAP_SECURITY_LABEL); 3851 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3852 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3853 server->caps |= NFS_CAP_ACLS; 3854 if (res.has_links != 0) 3855 server->caps |= NFS_CAP_HARDLINKS; 3856 if (res.has_symlinks != 0) 3857 server->caps |= NFS_CAP_SYMLINKS; 3858 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3859 server->caps |= NFS_CAP_FILEID; 3860 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3861 server->caps |= NFS_CAP_MODE; 3862 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3863 server->caps |= NFS_CAP_NLINK; 3864 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3865 server->caps |= NFS_CAP_OWNER; 3866 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3867 server->caps |= NFS_CAP_OWNER_GROUP; 3868 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3869 server->caps |= NFS_CAP_ATIME; 3870 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3871 server->caps |= NFS_CAP_CTIME; 3872 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3873 server->caps |= NFS_CAP_MTIME; 3874 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3875 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3876 server->caps |= NFS_CAP_SECURITY_LABEL; 3877 #endif 3878 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3879 sizeof(server->attr_bitmask)); 3880 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3881 3882 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3883 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3884 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3885 server->cache_consistency_bitmask[2] = 0; 3886 3887 /* Avoid a regression due to buggy server */ 3888 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3889 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3890 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3891 sizeof(server->exclcreat_bitmask)); 3892 3893 server->acl_bitmask = res.acl_bitmask; 3894 server->fh_expire_type = res.fh_expire_type; 3895 } 3896 3897 return status; 3898 } 3899 3900 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3901 { 3902 struct nfs4_exception exception = { 3903 .interruptible = true, 3904 }; 3905 int err; 3906 do { 3907 err = nfs4_handle_exception(server, 3908 _nfs4_server_capabilities(server, fhandle), 3909 &exception); 3910 } while (exception.retry); 3911 return err; 3912 } 3913 3914 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3915 struct nfs_fsinfo *info) 3916 { 3917 u32 bitmask[3]; 3918 struct nfs4_lookup_root_arg args = { 3919 .bitmask = bitmask, 3920 }; 3921 struct nfs4_lookup_res res = { 3922 .server = server, 3923 .fattr = info->fattr, 3924 .fh = fhandle, 3925 }; 3926 struct rpc_message msg = { 3927 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3928 .rpc_argp = &args, 3929 .rpc_resp = &res, 3930 }; 3931 3932 bitmask[0] = nfs4_fattr_bitmap[0]; 3933 bitmask[1] = nfs4_fattr_bitmap[1]; 3934 /* 3935 * Process the label in the upcoming getfattr 3936 */ 3937 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3938 3939 nfs_fattr_init(info->fattr); 3940 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3941 } 3942 3943 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3944 struct nfs_fsinfo *info) 3945 { 3946 struct nfs4_exception exception = { 3947 .interruptible = true, 3948 }; 3949 int err; 3950 do { 3951 err = _nfs4_lookup_root(server, fhandle, info); 3952 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3953 switch (err) { 3954 case 0: 3955 case -NFS4ERR_WRONGSEC: 3956 goto out; 3957 default: 3958 err = nfs4_handle_exception(server, err, &exception); 3959 } 3960 } while (exception.retry); 3961 out: 3962 return err; 3963 } 3964 3965 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3966 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3967 { 3968 struct rpc_auth_create_args auth_args = { 3969 .pseudoflavor = flavor, 3970 }; 3971 struct rpc_auth *auth; 3972 3973 auth = rpcauth_create(&auth_args, server->client); 3974 if (IS_ERR(auth)) 3975 return -EACCES; 3976 return nfs4_lookup_root(server, fhandle, info); 3977 } 3978 3979 /* 3980 * Retry pseudoroot lookup with various security flavors. We do this when: 3981 * 3982 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3983 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3984 * 3985 * Returns zero on success, or a negative NFS4ERR value, or a 3986 * negative errno value. 3987 */ 3988 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3989 struct nfs_fsinfo *info) 3990 { 3991 /* Per 3530bis 15.33.5 */ 3992 static const rpc_authflavor_t flav_array[] = { 3993 RPC_AUTH_GSS_KRB5P, 3994 RPC_AUTH_GSS_KRB5I, 3995 RPC_AUTH_GSS_KRB5, 3996 RPC_AUTH_UNIX, /* courtesy */ 3997 RPC_AUTH_NULL, 3998 }; 3999 int status = -EPERM; 4000 size_t i; 4001 4002 if (server->auth_info.flavor_len > 0) { 4003 /* try each flavor specified by user */ 4004 for (i = 0; i < server->auth_info.flavor_len; i++) { 4005 status = nfs4_lookup_root_sec(server, fhandle, info, 4006 server->auth_info.flavors[i]); 4007 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4008 continue; 4009 break; 4010 } 4011 } else { 4012 /* no flavors specified by user, try default list */ 4013 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4014 status = nfs4_lookup_root_sec(server, fhandle, info, 4015 flav_array[i]); 4016 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4017 continue; 4018 break; 4019 } 4020 } 4021 4022 /* 4023 * -EACCES could mean that the user doesn't have correct permissions 4024 * to access the mount. It could also mean that we tried to mount 4025 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4026 * existing mount programs don't handle -EACCES very well so it should 4027 * be mapped to -EPERM instead. 4028 */ 4029 if (status == -EACCES) 4030 status = -EPERM; 4031 return status; 4032 } 4033 4034 /** 4035 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4036 * @server: initialized nfs_server handle 4037 * @fhandle: we fill in the pseudo-fs root file handle 4038 * @info: we fill in an FSINFO struct 4039 * @auth_probe: probe the auth flavours 4040 * 4041 * Returns zero on success, or a negative errno. 4042 */ 4043 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4044 struct nfs_fsinfo *info, 4045 bool auth_probe) 4046 { 4047 int status = 0; 4048 4049 if (!auth_probe) 4050 status = nfs4_lookup_root(server, fhandle, info); 4051 4052 if (auth_probe || status == NFS4ERR_WRONGSEC) 4053 status = server->nfs_client->cl_mvops->find_root_sec(server, 4054 fhandle, info); 4055 4056 if (status == 0) 4057 status = nfs4_server_capabilities(server, fhandle); 4058 if (status == 0) 4059 status = nfs4_do_fsinfo(server, fhandle, info); 4060 4061 return nfs4_map_errors(status); 4062 } 4063 4064 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4065 struct nfs_fsinfo *info) 4066 { 4067 int error; 4068 struct nfs_fattr *fattr = info->fattr; 4069 struct nfs4_label *label = fattr->label; 4070 4071 error = nfs4_server_capabilities(server, mntfh); 4072 if (error < 0) { 4073 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4074 return error; 4075 } 4076 4077 error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL); 4078 if (error < 0) { 4079 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4080 goto out; 4081 } 4082 4083 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4084 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4085 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4086 4087 out: 4088 return error; 4089 } 4090 4091 /* 4092 * Get locations and (maybe) other attributes of a referral. 4093 * Note that we'll actually follow the referral later when 4094 * we detect fsid mismatch in inode revalidation 4095 */ 4096 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4097 const struct qstr *name, struct nfs_fattr *fattr, 4098 struct nfs_fh *fhandle) 4099 { 4100 int status = -ENOMEM; 4101 struct page *page = NULL; 4102 struct nfs4_fs_locations *locations = NULL; 4103 4104 page = alloc_page(GFP_KERNEL); 4105 if (page == NULL) 4106 goto out; 4107 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4108 if (locations == NULL) 4109 goto out; 4110 4111 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4112 if (status != 0) 4113 goto out; 4114 4115 /* 4116 * If the fsid didn't change, this is a migration event, not a 4117 * referral. Cause us to drop into the exception handler, which 4118 * will kick off migration recovery. 4119 */ 4120 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 4121 dprintk("%s: server did not return a different fsid for" 4122 " a referral at %s\n", __func__, name->name); 4123 status = -NFS4ERR_MOVED; 4124 goto out; 4125 } 4126 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4127 nfs_fixup_referral_attributes(&locations->fattr); 4128 4129 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 4130 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 4131 memset(fhandle, 0, sizeof(struct nfs_fh)); 4132 out: 4133 if (page) 4134 __free_page(page); 4135 kfree(locations); 4136 return status; 4137 } 4138 4139 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4140 struct nfs_fattr *fattr, struct nfs4_label *label, 4141 struct inode *inode) 4142 { 4143 __u32 bitmask[NFS4_BITMASK_SZ]; 4144 struct nfs4_getattr_arg args = { 4145 .fh = fhandle, 4146 .bitmask = bitmask, 4147 }; 4148 struct nfs4_getattr_res res = { 4149 .fattr = fattr, 4150 .label = label, 4151 .server = server, 4152 }; 4153 struct rpc_message msg = { 4154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4155 .rpc_argp = &args, 4156 .rpc_resp = &res, 4157 }; 4158 unsigned short task_flags = 0; 4159 4160 /* Is this is an attribute revalidation, subject to softreval? */ 4161 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4162 task_flags |= RPC_TASK_TIMEOUT; 4163 4164 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode); 4165 4166 nfs_fattr_init(fattr); 4167 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4168 return nfs4_do_call_sync(server->client, server, &msg, 4169 &args.seq_args, &res.seq_res, task_flags); 4170 } 4171 4172 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4173 struct nfs_fattr *fattr, struct nfs4_label *label, 4174 struct inode *inode) 4175 { 4176 struct nfs4_exception exception = { 4177 .interruptible = true, 4178 }; 4179 int err; 4180 do { 4181 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode); 4182 trace_nfs4_getattr(server, fhandle, fattr, err); 4183 err = nfs4_handle_exception(server, err, 4184 &exception); 4185 } while (exception.retry); 4186 return err; 4187 } 4188 4189 /* 4190 * The file is not closed if it is opened due to the a request to change 4191 * the size of the file. The open call will not be needed once the 4192 * VFS layer lookup-intents are implemented. 4193 * 4194 * Close is called when the inode is destroyed. 4195 * If we haven't opened the file for O_WRONLY, we 4196 * need to in the size_change case to obtain a stateid. 4197 * 4198 * Got race? 4199 * Because OPEN is always done by name in nfsv4, it is 4200 * possible that we opened a different file by the same 4201 * name. We can recognize this race condition, but we 4202 * can't do anything about it besides returning an error. 4203 * 4204 * This will be fixed with VFS changes (lookup-intent). 4205 */ 4206 static int 4207 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4208 struct iattr *sattr) 4209 { 4210 struct inode *inode = d_inode(dentry); 4211 const struct cred *cred = NULL; 4212 struct nfs_open_context *ctx = NULL; 4213 struct nfs4_label *label = NULL; 4214 int status; 4215 4216 if (pnfs_ld_layoutret_on_setattr(inode) && 4217 sattr->ia_valid & ATTR_SIZE && 4218 sattr->ia_size < i_size_read(inode)) 4219 pnfs_commit_and_return_layout(inode); 4220 4221 nfs_fattr_init(fattr); 4222 4223 /* Deal with open(O_TRUNC) */ 4224 if (sattr->ia_valid & ATTR_OPEN) 4225 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4226 4227 /* Optimization: if the end result is no change, don't RPC */ 4228 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4229 return 0; 4230 4231 /* Search for an existing open(O_WRITE) file */ 4232 if (sattr->ia_valid & ATTR_FILE) { 4233 4234 ctx = nfs_file_open_context(sattr->ia_file); 4235 if (ctx) 4236 cred = ctx->cred; 4237 } 4238 4239 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 4240 if (IS_ERR(label)) 4241 return PTR_ERR(label); 4242 4243 /* Return any delegations if we're going to change ACLs */ 4244 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4245 nfs4_inode_make_writeable(inode); 4246 4247 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label); 4248 if (status == 0) { 4249 nfs_setattr_update_inode(inode, sattr, fattr); 4250 nfs_setsecurity(inode, fattr, label); 4251 } 4252 nfs4_label_free(label); 4253 return status; 4254 } 4255 4256 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4257 struct dentry *dentry, struct nfs_fh *fhandle, 4258 struct nfs_fattr *fattr, struct nfs4_label *label) 4259 { 4260 struct nfs_server *server = NFS_SERVER(dir); 4261 int status; 4262 struct nfs4_lookup_arg args = { 4263 .bitmask = server->attr_bitmask, 4264 .dir_fh = NFS_FH(dir), 4265 .name = &dentry->d_name, 4266 }; 4267 struct nfs4_lookup_res res = { 4268 .server = server, 4269 .fattr = fattr, 4270 .label = label, 4271 .fh = fhandle, 4272 }; 4273 struct rpc_message msg = { 4274 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4275 .rpc_argp = &args, 4276 .rpc_resp = &res, 4277 }; 4278 unsigned short task_flags = 0; 4279 4280 /* Is this is an attribute revalidation, subject to softreval? */ 4281 if (nfs_lookup_is_soft_revalidate(dentry)) 4282 task_flags |= RPC_TASK_TIMEOUT; 4283 4284 args.bitmask = nfs4_bitmask(server, label); 4285 4286 nfs_fattr_init(fattr); 4287 4288 dprintk("NFS call lookup %pd2\n", dentry); 4289 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4290 status = nfs4_do_call_sync(clnt, server, &msg, 4291 &args.seq_args, &res.seq_res, task_flags); 4292 dprintk("NFS reply lookup: %d\n", status); 4293 return status; 4294 } 4295 4296 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4297 { 4298 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4299 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4300 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4301 fattr->nlink = 2; 4302 } 4303 4304 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4305 struct dentry *dentry, struct nfs_fh *fhandle, 4306 struct nfs_fattr *fattr, struct nfs4_label *label) 4307 { 4308 struct nfs4_exception exception = { 4309 .interruptible = true, 4310 }; 4311 struct rpc_clnt *client = *clnt; 4312 const struct qstr *name = &dentry->d_name; 4313 int err; 4314 do { 4315 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label); 4316 trace_nfs4_lookup(dir, name, err); 4317 switch (err) { 4318 case -NFS4ERR_BADNAME: 4319 err = -ENOENT; 4320 goto out; 4321 case -NFS4ERR_MOVED: 4322 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4323 if (err == -NFS4ERR_MOVED) 4324 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4325 goto out; 4326 case -NFS4ERR_WRONGSEC: 4327 err = -EPERM; 4328 if (client != *clnt) 4329 goto out; 4330 client = nfs4_negotiate_security(client, dir, name); 4331 if (IS_ERR(client)) 4332 return PTR_ERR(client); 4333 4334 exception.retry = 1; 4335 break; 4336 default: 4337 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4338 } 4339 } while (exception.retry); 4340 4341 out: 4342 if (err == 0) 4343 *clnt = client; 4344 else if (client != *clnt) 4345 rpc_shutdown_client(client); 4346 4347 return err; 4348 } 4349 4350 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4351 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4352 struct nfs4_label *label) 4353 { 4354 int status; 4355 struct rpc_clnt *client = NFS_CLIENT(dir); 4356 4357 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label); 4358 if (client != NFS_CLIENT(dir)) { 4359 rpc_shutdown_client(client); 4360 nfs_fixup_secinfo_attributes(fattr); 4361 } 4362 return status; 4363 } 4364 4365 struct rpc_clnt * 4366 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4367 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4368 { 4369 struct rpc_clnt *client = NFS_CLIENT(dir); 4370 int status; 4371 4372 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL); 4373 if (status < 0) 4374 return ERR_PTR(status); 4375 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4376 } 4377 4378 static int _nfs4_proc_lookupp(struct inode *inode, 4379 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4380 struct nfs4_label *label) 4381 { 4382 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4383 struct nfs_server *server = NFS_SERVER(inode); 4384 int status; 4385 struct nfs4_lookupp_arg args = { 4386 .bitmask = server->attr_bitmask, 4387 .fh = NFS_FH(inode), 4388 }; 4389 struct nfs4_lookupp_res res = { 4390 .server = server, 4391 .fattr = fattr, 4392 .label = label, 4393 .fh = fhandle, 4394 }; 4395 struct rpc_message msg = { 4396 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4397 .rpc_argp = &args, 4398 .rpc_resp = &res, 4399 }; 4400 4401 args.bitmask = nfs4_bitmask(server, label); 4402 4403 nfs_fattr_init(fattr); 4404 4405 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4406 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4407 &res.seq_res, 0); 4408 dprintk("NFS reply lookupp: %d\n", status); 4409 return status; 4410 } 4411 4412 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4413 struct nfs_fattr *fattr, struct nfs4_label *label) 4414 { 4415 struct nfs4_exception exception = { 4416 .interruptible = true, 4417 }; 4418 int err; 4419 do { 4420 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label); 4421 trace_nfs4_lookupp(inode, err); 4422 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4423 &exception); 4424 } while (exception.retry); 4425 return err; 4426 } 4427 4428 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4429 { 4430 struct nfs_server *server = NFS_SERVER(inode); 4431 struct nfs4_accessargs args = { 4432 .fh = NFS_FH(inode), 4433 .access = entry->mask, 4434 }; 4435 struct nfs4_accessres res = { 4436 .server = server, 4437 }; 4438 struct rpc_message msg = { 4439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4440 .rpc_argp = &args, 4441 .rpc_resp = &res, 4442 .rpc_cred = entry->cred, 4443 }; 4444 int status = 0; 4445 4446 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4447 res.fattr = nfs_alloc_fattr(); 4448 if (res.fattr == NULL) 4449 return -ENOMEM; 4450 args.bitmask = server->cache_consistency_bitmask; 4451 } 4452 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4453 if (!status) { 4454 nfs_access_set_mask(entry, res.access); 4455 if (res.fattr) 4456 nfs_refresh_inode(inode, res.fattr); 4457 } 4458 nfs_free_fattr(res.fattr); 4459 return status; 4460 } 4461 4462 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4463 { 4464 struct nfs4_exception exception = { 4465 .interruptible = true, 4466 }; 4467 int err; 4468 do { 4469 err = _nfs4_proc_access(inode, entry); 4470 trace_nfs4_access(inode, err); 4471 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4472 &exception); 4473 } while (exception.retry); 4474 return err; 4475 } 4476 4477 /* 4478 * TODO: For the time being, we don't try to get any attributes 4479 * along with any of the zero-copy operations READ, READDIR, 4480 * READLINK, WRITE. 4481 * 4482 * In the case of the first three, we want to put the GETATTR 4483 * after the read-type operation -- this is because it is hard 4484 * to predict the length of a GETATTR response in v4, and thus 4485 * align the READ data correctly. This means that the GETATTR 4486 * may end up partially falling into the page cache, and we should 4487 * shift it into the 'tail' of the xdr_buf before processing. 4488 * To do this efficiently, we need to know the total length 4489 * of data received, which doesn't seem to be available outside 4490 * of the RPC layer. 4491 * 4492 * In the case of WRITE, we also want to put the GETATTR after 4493 * the operation -- in this case because we want to make sure 4494 * we get the post-operation mtime and size. 4495 * 4496 * Both of these changes to the XDR layer would in fact be quite 4497 * minor, but I decided to leave them for a subsequent patch. 4498 */ 4499 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4500 unsigned int pgbase, unsigned int pglen) 4501 { 4502 struct nfs4_readlink args = { 4503 .fh = NFS_FH(inode), 4504 .pgbase = pgbase, 4505 .pglen = pglen, 4506 .pages = &page, 4507 }; 4508 struct nfs4_readlink_res res; 4509 struct rpc_message msg = { 4510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4511 .rpc_argp = &args, 4512 .rpc_resp = &res, 4513 }; 4514 4515 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4516 } 4517 4518 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4519 unsigned int pgbase, unsigned int pglen) 4520 { 4521 struct nfs4_exception exception = { 4522 .interruptible = true, 4523 }; 4524 int err; 4525 do { 4526 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4527 trace_nfs4_readlink(inode, err); 4528 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4529 &exception); 4530 } while (exception.retry); 4531 return err; 4532 } 4533 4534 /* 4535 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4536 */ 4537 static int 4538 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4539 int flags) 4540 { 4541 struct nfs_server *server = NFS_SERVER(dir); 4542 struct nfs4_label l, *ilabel = NULL; 4543 struct nfs_open_context *ctx; 4544 struct nfs4_state *state; 4545 int status = 0; 4546 4547 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4548 if (IS_ERR(ctx)) 4549 return PTR_ERR(ctx); 4550 4551 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4552 4553 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4554 sattr->ia_mode &= ~current_umask(); 4555 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4556 if (IS_ERR(state)) { 4557 status = PTR_ERR(state); 4558 goto out; 4559 } 4560 out: 4561 nfs4_label_release_security(ilabel); 4562 put_nfs_open_context(ctx); 4563 return status; 4564 } 4565 4566 static int 4567 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4568 { 4569 struct nfs_server *server = NFS_SERVER(dir); 4570 struct nfs_removeargs args = { 4571 .fh = NFS_FH(dir), 4572 .name = *name, 4573 }; 4574 struct nfs_removeres res = { 4575 .server = server, 4576 }; 4577 struct rpc_message msg = { 4578 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4579 .rpc_argp = &args, 4580 .rpc_resp = &res, 4581 }; 4582 unsigned long timestamp = jiffies; 4583 int status; 4584 4585 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4586 if (status == 0) { 4587 spin_lock(&dir->i_lock); 4588 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4589 NFS_INO_INVALID_DATA); 4590 /* Removing a directory decrements nlink in the parent */ 4591 if (ftype == NF4DIR && dir->i_nlink > 2) 4592 nfs4_dec_nlink_locked(dir); 4593 spin_unlock(&dir->i_lock); 4594 } 4595 return status; 4596 } 4597 4598 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4599 { 4600 struct nfs4_exception exception = { 4601 .interruptible = true, 4602 }; 4603 struct inode *inode = d_inode(dentry); 4604 int err; 4605 4606 if (inode) { 4607 if (inode->i_nlink == 1) 4608 nfs4_inode_return_delegation(inode); 4609 else 4610 nfs4_inode_make_writeable(inode); 4611 } 4612 do { 4613 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4614 trace_nfs4_remove(dir, &dentry->d_name, err); 4615 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4616 &exception); 4617 } while (exception.retry); 4618 return err; 4619 } 4620 4621 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4622 { 4623 struct nfs4_exception exception = { 4624 .interruptible = true, 4625 }; 4626 int err; 4627 4628 do { 4629 err = _nfs4_proc_remove(dir, name, NF4DIR); 4630 trace_nfs4_remove(dir, name, err); 4631 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4632 &exception); 4633 } while (exception.retry); 4634 return err; 4635 } 4636 4637 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4638 struct dentry *dentry, 4639 struct inode *inode) 4640 { 4641 struct nfs_removeargs *args = msg->rpc_argp; 4642 struct nfs_removeres *res = msg->rpc_resp; 4643 4644 res->server = NFS_SB(dentry->d_sb); 4645 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4646 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4647 4648 nfs_fattr_init(res->dir_attr); 4649 4650 if (inode) 4651 nfs4_inode_return_delegation(inode); 4652 } 4653 4654 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4655 { 4656 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4657 &data->args.seq_args, 4658 &data->res.seq_res, 4659 task); 4660 } 4661 4662 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4663 { 4664 struct nfs_unlinkdata *data = task->tk_calldata; 4665 struct nfs_removeres *res = &data->res; 4666 4667 if (!nfs4_sequence_done(task, &res->seq_res)) 4668 return 0; 4669 if (nfs4_async_handle_error(task, res->server, NULL, 4670 &data->timeout) == -EAGAIN) 4671 return 0; 4672 if (task->tk_status == 0) 4673 nfs4_update_changeattr(dir, &res->cinfo, 4674 res->dir_attr->time_start, 4675 NFS_INO_INVALID_DATA); 4676 return 1; 4677 } 4678 4679 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4680 struct dentry *old_dentry, 4681 struct dentry *new_dentry) 4682 { 4683 struct nfs_renameargs *arg = msg->rpc_argp; 4684 struct nfs_renameres *res = msg->rpc_resp; 4685 struct inode *old_inode = d_inode(old_dentry); 4686 struct inode *new_inode = d_inode(new_dentry); 4687 4688 if (old_inode) 4689 nfs4_inode_make_writeable(old_inode); 4690 if (new_inode) 4691 nfs4_inode_return_delegation(new_inode); 4692 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4693 res->server = NFS_SB(old_dentry->d_sb); 4694 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4695 } 4696 4697 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4698 { 4699 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4700 &data->args.seq_args, 4701 &data->res.seq_res, 4702 task); 4703 } 4704 4705 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4706 struct inode *new_dir) 4707 { 4708 struct nfs_renamedata *data = task->tk_calldata; 4709 struct nfs_renameres *res = &data->res; 4710 4711 if (!nfs4_sequence_done(task, &res->seq_res)) 4712 return 0; 4713 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4714 return 0; 4715 4716 if (task->tk_status == 0) { 4717 if (new_dir != old_dir) { 4718 /* Note: If we moved a directory, nlink will change */ 4719 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4720 res->old_fattr->time_start, 4721 NFS_INO_INVALID_OTHER | 4722 NFS_INO_INVALID_DATA); 4723 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4724 res->new_fattr->time_start, 4725 NFS_INO_INVALID_OTHER | 4726 NFS_INO_INVALID_DATA); 4727 } else 4728 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4729 res->old_fattr->time_start, 4730 NFS_INO_INVALID_DATA); 4731 } 4732 return 1; 4733 } 4734 4735 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4736 { 4737 struct nfs_server *server = NFS_SERVER(inode); 4738 __u32 bitmask[NFS4_BITMASK_SZ]; 4739 struct nfs4_link_arg arg = { 4740 .fh = NFS_FH(inode), 4741 .dir_fh = NFS_FH(dir), 4742 .name = name, 4743 .bitmask = bitmask, 4744 }; 4745 struct nfs4_link_res res = { 4746 .server = server, 4747 .label = NULL, 4748 }; 4749 struct rpc_message msg = { 4750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4751 .rpc_argp = &arg, 4752 .rpc_resp = &res, 4753 }; 4754 int status = -ENOMEM; 4755 4756 res.fattr = nfs_alloc_fattr(); 4757 if (res.fattr == NULL) 4758 goto out; 4759 4760 res.label = nfs4_label_alloc(server, GFP_KERNEL); 4761 if (IS_ERR(res.label)) { 4762 status = PTR_ERR(res.label); 4763 goto out; 4764 } 4765 4766 nfs4_inode_make_writeable(inode); 4767 nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode); 4768 4769 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4770 if (!status) { 4771 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4772 NFS_INO_INVALID_DATA); 4773 status = nfs_post_op_update_inode(inode, res.fattr); 4774 if (!status) 4775 nfs_setsecurity(inode, res.fattr, res.label); 4776 } 4777 4778 4779 nfs4_label_free(res.label); 4780 4781 out: 4782 nfs_free_fattr(res.fattr); 4783 return status; 4784 } 4785 4786 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4787 { 4788 struct nfs4_exception exception = { 4789 .interruptible = true, 4790 }; 4791 int err; 4792 do { 4793 err = nfs4_handle_exception(NFS_SERVER(inode), 4794 _nfs4_proc_link(inode, dir, name), 4795 &exception); 4796 } while (exception.retry); 4797 return err; 4798 } 4799 4800 struct nfs4_createdata { 4801 struct rpc_message msg; 4802 struct nfs4_create_arg arg; 4803 struct nfs4_create_res res; 4804 struct nfs_fh fh; 4805 struct nfs_fattr fattr; 4806 struct nfs4_label *label; 4807 }; 4808 4809 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4810 const struct qstr *name, struct iattr *sattr, u32 ftype) 4811 { 4812 struct nfs4_createdata *data; 4813 4814 data = kzalloc(sizeof(*data), GFP_KERNEL); 4815 if (data != NULL) { 4816 struct nfs_server *server = NFS_SERVER(dir); 4817 4818 data->label = nfs4_label_alloc(server, GFP_KERNEL); 4819 if (IS_ERR(data->label)) 4820 goto out_free; 4821 4822 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4823 data->msg.rpc_argp = &data->arg; 4824 data->msg.rpc_resp = &data->res; 4825 data->arg.dir_fh = NFS_FH(dir); 4826 data->arg.server = server; 4827 data->arg.name = name; 4828 data->arg.attrs = sattr; 4829 data->arg.ftype = ftype; 4830 data->arg.bitmask = nfs4_bitmask(server, data->label); 4831 data->arg.umask = current_umask(); 4832 data->res.server = server; 4833 data->res.fh = &data->fh; 4834 data->res.fattr = &data->fattr; 4835 data->res.label = data->label; 4836 nfs_fattr_init(data->res.fattr); 4837 } 4838 return data; 4839 out_free: 4840 kfree(data); 4841 return NULL; 4842 } 4843 4844 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4845 { 4846 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4847 &data->arg.seq_args, &data->res.seq_res, 1); 4848 if (status == 0) { 4849 spin_lock(&dir->i_lock); 4850 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4851 data->res.fattr->time_start, 4852 NFS_INO_INVALID_DATA); 4853 /* Creating a directory bumps nlink in the parent */ 4854 if (data->arg.ftype == NF4DIR) 4855 nfs4_inc_nlink_locked(dir); 4856 spin_unlock(&dir->i_lock); 4857 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 4858 } 4859 return status; 4860 } 4861 4862 static void nfs4_free_createdata(struct nfs4_createdata *data) 4863 { 4864 nfs4_label_free(data->label); 4865 kfree(data); 4866 } 4867 4868 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4869 struct page *page, unsigned int len, struct iattr *sattr, 4870 struct nfs4_label *label) 4871 { 4872 struct nfs4_createdata *data; 4873 int status = -ENAMETOOLONG; 4874 4875 if (len > NFS4_MAXPATHLEN) 4876 goto out; 4877 4878 status = -ENOMEM; 4879 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 4880 if (data == NULL) 4881 goto out; 4882 4883 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 4884 data->arg.u.symlink.pages = &page; 4885 data->arg.u.symlink.len = len; 4886 data->arg.label = label; 4887 4888 status = nfs4_do_create(dir, dentry, data); 4889 4890 nfs4_free_createdata(data); 4891 out: 4892 return status; 4893 } 4894 4895 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4896 struct page *page, unsigned int len, struct iattr *sattr) 4897 { 4898 struct nfs4_exception exception = { 4899 .interruptible = true, 4900 }; 4901 struct nfs4_label l, *label = NULL; 4902 int err; 4903 4904 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4905 4906 do { 4907 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4908 trace_nfs4_symlink(dir, &dentry->d_name, err); 4909 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4910 &exception); 4911 } while (exception.retry); 4912 4913 nfs4_label_release_security(label); 4914 return err; 4915 } 4916 4917 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4918 struct iattr *sattr, struct nfs4_label *label) 4919 { 4920 struct nfs4_createdata *data; 4921 int status = -ENOMEM; 4922 4923 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4924 if (data == NULL) 4925 goto out; 4926 4927 data->arg.label = label; 4928 status = nfs4_do_create(dir, dentry, data); 4929 4930 nfs4_free_createdata(data); 4931 out: 4932 return status; 4933 } 4934 4935 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4936 struct iattr *sattr) 4937 { 4938 struct nfs_server *server = NFS_SERVER(dir); 4939 struct nfs4_exception exception = { 4940 .interruptible = true, 4941 }; 4942 struct nfs4_label l, *label = NULL; 4943 int err; 4944 4945 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4946 4947 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4948 sattr->ia_mode &= ~current_umask(); 4949 do { 4950 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4951 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4952 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4953 &exception); 4954 } while (exception.retry); 4955 nfs4_label_release_security(label); 4956 4957 return err; 4958 } 4959 4960 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred, 4961 u64 cookie, struct page **pages, unsigned int count, bool plus) 4962 { 4963 struct inode *dir = d_inode(dentry); 4964 struct nfs4_readdir_arg args = { 4965 .fh = NFS_FH(dir), 4966 .pages = pages, 4967 .pgbase = 0, 4968 .count = count, 4969 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4970 .plus = plus, 4971 }; 4972 struct nfs4_readdir_res res; 4973 struct rpc_message msg = { 4974 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4975 .rpc_argp = &args, 4976 .rpc_resp = &res, 4977 .rpc_cred = cred, 4978 }; 4979 int status; 4980 4981 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4982 dentry, 4983 (unsigned long long)cookie); 4984 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4985 res.pgbase = args.pgbase; 4986 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4987 if (status >= 0) { 4988 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4989 status += args.pgbase; 4990 } 4991 4992 nfs_invalidate_atime(dir); 4993 4994 dprintk("%s: returns %d\n", __func__, status); 4995 return status; 4996 } 4997 4998 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred, 4999 u64 cookie, struct page **pages, unsigned int count, bool plus) 5000 { 5001 struct nfs4_exception exception = { 5002 .interruptible = true, 5003 }; 5004 int err; 5005 do { 5006 err = _nfs4_proc_readdir(dentry, cred, cookie, 5007 pages, count, plus); 5008 trace_nfs4_readdir(d_inode(dentry), err); 5009 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 5010 &exception); 5011 } while (exception.retry); 5012 return err; 5013 } 5014 5015 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5016 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5017 { 5018 struct nfs4_createdata *data; 5019 int mode = sattr->ia_mode; 5020 int status = -ENOMEM; 5021 5022 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5023 if (data == NULL) 5024 goto out; 5025 5026 if (S_ISFIFO(mode)) 5027 data->arg.ftype = NF4FIFO; 5028 else if (S_ISBLK(mode)) { 5029 data->arg.ftype = NF4BLK; 5030 data->arg.u.device.specdata1 = MAJOR(rdev); 5031 data->arg.u.device.specdata2 = MINOR(rdev); 5032 } 5033 else if (S_ISCHR(mode)) { 5034 data->arg.ftype = NF4CHR; 5035 data->arg.u.device.specdata1 = MAJOR(rdev); 5036 data->arg.u.device.specdata2 = MINOR(rdev); 5037 } else if (!S_ISSOCK(mode)) { 5038 status = -EINVAL; 5039 goto out_free; 5040 } 5041 5042 data->arg.label = label; 5043 status = nfs4_do_create(dir, dentry, data); 5044 out_free: 5045 nfs4_free_createdata(data); 5046 out: 5047 return status; 5048 } 5049 5050 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5051 struct iattr *sattr, dev_t rdev) 5052 { 5053 struct nfs_server *server = NFS_SERVER(dir); 5054 struct nfs4_exception exception = { 5055 .interruptible = true, 5056 }; 5057 struct nfs4_label l, *label = NULL; 5058 int err; 5059 5060 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5061 5062 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5063 sattr->ia_mode &= ~current_umask(); 5064 do { 5065 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5066 trace_nfs4_mknod(dir, &dentry->d_name, err); 5067 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5068 &exception); 5069 } while (exception.retry); 5070 5071 nfs4_label_release_security(label); 5072 5073 return err; 5074 } 5075 5076 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5077 struct nfs_fsstat *fsstat) 5078 { 5079 struct nfs4_statfs_arg args = { 5080 .fh = fhandle, 5081 .bitmask = server->attr_bitmask, 5082 }; 5083 struct nfs4_statfs_res res = { 5084 .fsstat = fsstat, 5085 }; 5086 struct rpc_message msg = { 5087 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5088 .rpc_argp = &args, 5089 .rpc_resp = &res, 5090 }; 5091 5092 nfs_fattr_init(fsstat->fattr); 5093 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5094 } 5095 5096 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5097 { 5098 struct nfs4_exception exception = { 5099 .interruptible = true, 5100 }; 5101 int err; 5102 do { 5103 err = nfs4_handle_exception(server, 5104 _nfs4_proc_statfs(server, fhandle, fsstat), 5105 &exception); 5106 } while (exception.retry); 5107 return err; 5108 } 5109 5110 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5111 struct nfs_fsinfo *fsinfo) 5112 { 5113 struct nfs4_fsinfo_arg args = { 5114 .fh = fhandle, 5115 .bitmask = server->attr_bitmask, 5116 }; 5117 struct nfs4_fsinfo_res res = { 5118 .fsinfo = fsinfo, 5119 }; 5120 struct rpc_message msg = { 5121 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5122 .rpc_argp = &args, 5123 .rpc_resp = &res, 5124 }; 5125 5126 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5127 } 5128 5129 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5130 { 5131 struct nfs4_exception exception = { 5132 .interruptible = true, 5133 }; 5134 int err; 5135 5136 do { 5137 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5138 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5139 if (err == 0) { 5140 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5141 break; 5142 } 5143 err = nfs4_handle_exception(server, err, &exception); 5144 } while (exception.retry); 5145 return err; 5146 } 5147 5148 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5149 { 5150 int error; 5151 5152 nfs_fattr_init(fsinfo->fattr); 5153 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5154 if (error == 0) { 5155 /* block layout checks this! */ 5156 server->pnfs_blksize = fsinfo->blksize; 5157 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5158 } 5159 5160 return error; 5161 } 5162 5163 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5164 struct nfs_pathconf *pathconf) 5165 { 5166 struct nfs4_pathconf_arg args = { 5167 .fh = fhandle, 5168 .bitmask = server->attr_bitmask, 5169 }; 5170 struct nfs4_pathconf_res res = { 5171 .pathconf = pathconf, 5172 }; 5173 struct rpc_message msg = { 5174 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5175 .rpc_argp = &args, 5176 .rpc_resp = &res, 5177 }; 5178 5179 /* None of the pathconf attributes are mandatory to implement */ 5180 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5181 memset(pathconf, 0, sizeof(*pathconf)); 5182 return 0; 5183 } 5184 5185 nfs_fattr_init(pathconf->fattr); 5186 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5187 } 5188 5189 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5190 struct nfs_pathconf *pathconf) 5191 { 5192 struct nfs4_exception exception = { 5193 .interruptible = true, 5194 }; 5195 int err; 5196 5197 do { 5198 err = nfs4_handle_exception(server, 5199 _nfs4_proc_pathconf(server, fhandle, pathconf), 5200 &exception); 5201 } while (exception.retry); 5202 return err; 5203 } 5204 5205 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5206 const struct nfs_open_context *ctx, 5207 const struct nfs_lock_context *l_ctx, 5208 fmode_t fmode) 5209 { 5210 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5211 } 5212 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5213 5214 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5215 const struct nfs_open_context *ctx, 5216 const struct nfs_lock_context *l_ctx, 5217 fmode_t fmode) 5218 { 5219 nfs4_stateid _current_stateid; 5220 5221 /* If the current stateid represents a lost lock, then exit */ 5222 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5223 return true; 5224 return nfs4_stateid_match(stateid, &_current_stateid); 5225 } 5226 5227 static bool nfs4_error_stateid_expired(int err) 5228 { 5229 switch (err) { 5230 case -NFS4ERR_DELEG_REVOKED: 5231 case -NFS4ERR_ADMIN_REVOKED: 5232 case -NFS4ERR_BAD_STATEID: 5233 case -NFS4ERR_STALE_STATEID: 5234 case -NFS4ERR_OLD_STATEID: 5235 case -NFS4ERR_OPENMODE: 5236 case -NFS4ERR_EXPIRED: 5237 return true; 5238 } 5239 return false; 5240 } 5241 5242 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5243 { 5244 struct nfs_server *server = NFS_SERVER(hdr->inode); 5245 5246 trace_nfs4_read(hdr, task->tk_status); 5247 if (task->tk_status < 0) { 5248 struct nfs4_exception exception = { 5249 .inode = hdr->inode, 5250 .state = hdr->args.context->state, 5251 .stateid = &hdr->args.stateid, 5252 }; 5253 task->tk_status = nfs4_async_handle_exception(task, 5254 server, task->tk_status, &exception); 5255 if (exception.retry) { 5256 rpc_restart_call_prepare(task); 5257 return -EAGAIN; 5258 } 5259 } 5260 5261 if (task->tk_status > 0) 5262 renew_lease(server, hdr->timestamp); 5263 return 0; 5264 } 5265 5266 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5267 struct nfs_pgio_args *args) 5268 { 5269 5270 if (!nfs4_error_stateid_expired(task->tk_status) || 5271 nfs4_stateid_is_current(&args->stateid, 5272 args->context, 5273 args->lock_context, 5274 FMODE_READ)) 5275 return false; 5276 rpc_restart_call_prepare(task); 5277 return true; 5278 } 5279 5280 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5281 struct nfs_pgio_header *hdr) 5282 { 5283 struct nfs_server *server = NFS_SERVER(hdr->inode); 5284 struct rpc_message *msg = &task->tk_msg; 5285 5286 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5287 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5288 server->caps &= ~NFS_CAP_READ_PLUS; 5289 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5290 rpc_restart_call_prepare(task); 5291 return true; 5292 } 5293 return false; 5294 } 5295 5296 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5297 { 5298 dprintk("--> %s\n", __func__); 5299 5300 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5301 return -EAGAIN; 5302 if (nfs4_read_stateid_changed(task, &hdr->args)) 5303 return -EAGAIN; 5304 if (nfs4_read_plus_not_supported(task, hdr)) 5305 return -EAGAIN; 5306 if (task->tk_status > 0) 5307 nfs_invalidate_atime(hdr->inode); 5308 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5309 nfs4_read_done_cb(task, hdr); 5310 } 5311 5312 #ifdef CONFIG_NFS_V4_2 5313 static void nfs42_read_plus_support(struct nfs_server *server, struct rpc_message *msg) 5314 { 5315 if (server->caps & NFS_CAP_READ_PLUS) 5316 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5317 else 5318 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5319 } 5320 #else 5321 static void nfs42_read_plus_support(struct nfs_server *server, struct rpc_message *msg) 5322 { 5323 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5324 } 5325 #endif /* CONFIG_NFS_V4_2 */ 5326 5327 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5328 struct rpc_message *msg) 5329 { 5330 hdr->timestamp = jiffies; 5331 if (!hdr->pgio_done_cb) 5332 hdr->pgio_done_cb = nfs4_read_done_cb; 5333 nfs42_read_plus_support(NFS_SERVER(hdr->inode), msg); 5334 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5335 } 5336 5337 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5338 struct nfs_pgio_header *hdr) 5339 { 5340 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5341 &hdr->args.seq_args, 5342 &hdr->res.seq_res, 5343 task)) 5344 return 0; 5345 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5346 hdr->args.lock_context, 5347 hdr->rw_mode) == -EIO) 5348 return -EIO; 5349 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5350 return -EIO; 5351 return 0; 5352 } 5353 5354 static int nfs4_write_done_cb(struct rpc_task *task, 5355 struct nfs_pgio_header *hdr) 5356 { 5357 struct inode *inode = hdr->inode; 5358 5359 trace_nfs4_write(hdr, task->tk_status); 5360 if (task->tk_status < 0) { 5361 struct nfs4_exception exception = { 5362 .inode = hdr->inode, 5363 .state = hdr->args.context->state, 5364 .stateid = &hdr->args.stateid, 5365 }; 5366 task->tk_status = nfs4_async_handle_exception(task, 5367 NFS_SERVER(inode), task->tk_status, 5368 &exception); 5369 if (exception.retry) { 5370 rpc_restart_call_prepare(task); 5371 return -EAGAIN; 5372 } 5373 } 5374 if (task->tk_status >= 0) { 5375 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5376 nfs_writeback_update_inode(hdr); 5377 } 5378 return 0; 5379 } 5380 5381 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5382 struct nfs_pgio_args *args) 5383 { 5384 5385 if (!nfs4_error_stateid_expired(task->tk_status) || 5386 nfs4_stateid_is_current(&args->stateid, 5387 args->context, 5388 args->lock_context, 5389 FMODE_WRITE)) 5390 return false; 5391 rpc_restart_call_prepare(task); 5392 return true; 5393 } 5394 5395 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5396 { 5397 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5398 return -EAGAIN; 5399 if (nfs4_write_stateid_changed(task, &hdr->args)) 5400 return -EAGAIN; 5401 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5402 nfs4_write_done_cb(task, hdr); 5403 } 5404 5405 static 5406 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5407 { 5408 /* Don't request attributes for pNFS or O_DIRECT writes */ 5409 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5410 return false; 5411 /* Otherwise, request attributes if and only if we don't hold 5412 * a delegation 5413 */ 5414 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5415 } 5416 5417 static void nfs4_bitmask_adjust(__u32 *bitmask, struct inode *inode, 5418 struct nfs_server *server, 5419 struct nfs4_label *label) 5420 { 5421 5422 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 5423 5424 if ((cache_validity & NFS_INO_INVALID_DATA) || 5425 (cache_validity & NFS_INO_REVAL_PAGECACHE) || 5426 (cache_validity & NFS_INO_REVAL_FORCED) || 5427 (cache_validity & NFS_INO_INVALID_OTHER)) 5428 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode); 5429 5430 if (cache_validity & NFS_INO_INVALID_ATIME) 5431 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5432 if (cache_validity & NFS_INO_INVALID_ACCESS) 5433 bitmask[0] |= FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | 5434 FATTR4_WORD1_OWNER_GROUP; 5435 if (cache_validity & NFS_INO_INVALID_ACL) 5436 bitmask[0] |= FATTR4_WORD0_ACL; 5437 if (cache_validity & NFS_INO_INVALID_LABEL) 5438 bitmask[2] |= FATTR4_WORD2_SECURITY_LABEL; 5439 if (cache_validity & NFS_INO_INVALID_CTIME) 5440 bitmask[0] |= FATTR4_WORD0_CHANGE; 5441 if (cache_validity & NFS_INO_INVALID_MTIME) 5442 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5443 if (cache_validity & NFS_INO_INVALID_SIZE) 5444 bitmask[0] |= FATTR4_WORD0_SIZE; 5445 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5446 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5447 } 5448 5449 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5450 struct rpc_message *msg, 5451 struct rpc_clnt **clnt) 5452 { 5453 struct nfs_server *server = NFS_SERVER(hdr->inode); 5454 5455 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5456 hdr->args.bitmask = NULL; 5457 hdr->res.fattr = NULL; 5458 } else { 5459 hdr->args.bitmask = server->cache_consistency_bitmask; 5460 nfs4_bitmask_adjust(hdr->args.bitmask, hdr->inode, server, NULL); 5461 } 5462 5463 if (!hdr->pgio_done_cb) 5464 hdr->pgio_done_cb = nfs4_write_done_cb; 5465 hdr->res.server = server; 5466 hdr->timestamp = jiffies; 5467 5468 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5469 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5470 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5471 } 5472 5473 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5474 { 5475 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5476 &data->args.seq_args, 5477 &data->res.seq_res, 5478 task); 5479 } 5480 5481 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5482 { 5483 struct inode *inode = data->inode; 5484 5485 trace_nfs4_commit(data, task->tk_status); 5486 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5487 NULL, NULL) == -EAGAIN) { 5488 rpc_restart_call_prepare(task); 5489 return -EAGAIN; 5490 } 5491 return 0; 5492 } 5493 5494 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5495 { 5496 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5497 return -EAGAIN; 5498 return data->commit_done_cb(task, data); 5499 } 5500 5501 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5502 struct rpc_clnt **clnt) 5503 { 5504 struct nfs_server *server = NFS_SERVER(data->inode); 5505 5506 if (data->commit_done_cb == NULL) 5507 data->commit_done_cb = nfs4_commit_done_cb; 5508 data->res.server = server; 5509 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5510 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5511 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5512 } 5513 5514 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5515 struct nfs_commitres *res) 5516 { 5517 struct inode *dst_inode = file_inode(dst); 5518 struct nfs_server *server = NFS_SERVER(dst_inode); 5519 struct rpc_message msg = { 5520 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5521 .rpc_argp = args, 5522 .rpc_resp = res, 5523 }; 5524 5525 args->fh = NFS_FH(dst_inode); 5526 return nfs4_call_sync(server->client, server, &msg, 5527 &args->seq_args, &res->seq_res, 1); 5528 } 5529 5530 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5531 { 5532 struct nfs_commitargs args = { 5533 .offset = offset, 5534 .count = count, 5535 }; 5536 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5537 struct nfs4_exception exception = { }; 5538 int status; 5539 5540 do { 5541 status = _nfs4_proc_commit(dst, &args, res); 5542 status = nfs4_handle_exception(dst_server, status, &exception); 5543 } while (exception.retry); 5544 5545 return status; 5546 } 5547 5548 struct nfs4_renewdata { 5549 struct nfs_client *client; 5550 unsigned long timestamp; 5551 }; 5552 5553 /* 5554 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5555 * standalone procedure for queueing an asynchronous RENEW. 5556 */ 5557 static void nfs4_renew_release(void *calldata) 5558 { 5559 struct nfs4_renewdata *data = calldata; 5560 struct nfs_client *clp = data->client; 5561 5562 if (refcount_read(&clp->cl_count) > 1) 5563 nfs4_schedule_state_renewal(clp); 5564 nfs_put_client(clp); 5565 kfree(data); 5566 } 5567 5568 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5569 { 5570 struct nfs4_renewdata *data = calldata; 5571 struct nfs_client *clp = data->client; 5572 unsigned long timestamp = data->timestamp; 5573 5574 trace_nfs4_renew_async(clp, task->tk_status); 5575 switch (task->tk_status) { 5576 case 0: 5577 break; 5578 case -NFS4ERR_LEASE_MOVED: 5579 nfs4_schedule_lease_moved_recovery(clp); 5580 break; 5581 default: 5582 /* Unless we're shutting down, schedule state recovery! */ 5583 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5584 return; 5585 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5586 nfs4_schedule_lease_recovery(clp); 5587 return; 5588 } 5589 nfs4_schedule_path_down_recovery(clp); 5590 } 5591 do_renew_lease(clp, timestamp); 5592 } 5593 5594 static const struct rpc_call_ops nfs4_renew_ops = { 5595 .rpc_call_done = nfs4_renew_done, 5596 .rpc_release = nfs4_renew_release, 5597 }; 5598 5599 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5600 { 5601 struct rpc_message msg = { 5602 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5603 .rpc_argp = clp, 5604 .rpc_cred = cred, 5605 }; 5606 struct nfs4_renewdata *data; 5607 5608 if (renew_flags == 0) 5609 return 0; 5610 if (!refcount_inc_not_zero(&clp->cl_count)) 5611 return -EIO; 5612 data = kmalloc(sizeof(*data), GFP_NOFS); 5613 if (data == NULL) { 5614 nfs_put_client(clp); 5615 return -ENOMEM; 5616 } 5617 data->client = clp; 5618 data->timestamp = jiffies; 5619 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5620 &nfs4_renew_ops, data); 5621 } 5622 5623 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5624 { 5625 struct rpc_message msg = { 5626 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5627 .rpc_argp = clp, 5628 .rpc_cred = cred, 5629 }; 5630 unsigned long now = jiffies; 5631 int status; 5632 5633 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5634 if (status < 0) 5635 return status; 5636 do_renew_lease(clp, now); 5637 return 0; 5638 } 5639 5640 static inline int nfs4_server_supports_acls(struct nfs_server *server) 5641 { 5642 return server->caps & NFS_CAP_ACLS; 5643 } 5644 5645 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5646 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5647 * the stack. 5648 */ 5649 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5650 5651 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5652 struct page **pages) 5653 { 5654 struct page *newpage, **spages; 5655 int rc = 0; 5656 size_t len; 5657 spages = pages; 5658 5659 do { 5660 len = min_t(size_t, PAGE_SIZE, buflen); 5661 newpage = alloc_page(GFP_KERNEL); 5662 5663 if (newpage == NULL) 5664 goto unwind; 5665 memcpy(page_address(newpage), buf, len); 5666 buf += len; 5667 buflen -= len; 5668 *pages++ = newpage; 5669 rc++; 5670 } while (buflen != 0); 5671 5672 return rc; 5673 5674 unwind: 5675 for(; rc > 0; rc--) 5676 __free_page(spages[rc-1]); 5677 return -ENOMEM; 5678 } 5679 5680 struct nfs4_cached_acl { 5681 int cached; 5682 size_t len; 5683 char data[]; 5684 }; 5685 5686 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5687 { 5688 struct nfs_inode *nfsi = NFS_I(inode); 5689 5690 spin_lock(&inode->i_lock); 5691 kfree(nfsi->nfs4_acl); 5692 nfsi->nfs4_acl = acl; 5693 spin_unlock(&inode->i_lock); 5694 } 5695 5696 static void nfs4_zap_acl_attr(struct inode *inode) 5697 { 5698 nfs4_set_cached_acl(inode, NULL); 5699 } 5700 5701 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 5702 { 5703 struct nfs_inode *nfsi = NFS_I(inode); 5704 struct nfs4_cached_acl *acl; 5705 int ret = -ENOENT; 5706 5707 spin_lock(&inode->i_lock); 5708 acl = nfsi->nfs4_acl; 5709 if (acl == NULL) 5710 goto out; 5711 if (buf == NULL) /* user is just asking for length */ 5712 goto out_len; 5713 if (acl->cached == 0) 5714 goto out; 5715 ret = -ERANGE; /* see getxattr(2) man page */ 5716 if (acl->len > buflen) 5717 goto out; 5718 memcpy(buf, acl->data, acl->len); 5719 out_len: 5720 ret = acl->len; 5721 out: 5722 spin_unlock(&inode->i_lock); 5723 return ret; 5724 } 5725 5726 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 5727 { 5728 struct nfs4_cached_acl *acl; 5729 size_t buflen = sizeof(*acl) + acl_len; 5730 5731 if (buflen <= PAGE_SIZE) { 5732 acl = kmalloc(buflen, GFP_KERNEL); 5733 if (acl == NULL) 5734 goto out; 5735 acl->cached = 1; 5736 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5737 } else { 5738 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5739 if (acl == NULL) 5740 goto out; 5741 acl->cached = 0; 5742 } 5743 acl->len = acl_len; 5744 out: 5745 nfs4_set_cached_acl(inode, acl); 5746 } 5747 5748 /* 5749 * The getxattr API returns the required buffer length when called with a 5750 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5751 * the required buf. On a NULL buf, we send a page of data to the server 5752 * guessing that the ACL request can be serviced by a page. If so, we cache 5753 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5754 * the cache. If not so, we throw away the page, and cache the required 5755 * length. The next getxattr call will then produce another round trip to 5756 * the server, this time with the input buf of the required size. 5757 */ 5758 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5759 { 5760 struct page **pages; 5761 struct nfs_getaclargs args = { 5762 .fh = NFS_FH(inode), 5763 .acl_len = buflen, 5764 }; 5765 struct nfs_getaclres res = { 5766 .acl_len = buflen, 5767 }; 5768 struct rpc_message msg = { 5769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5770 .rpc_argp = &args, 5771 .rpc_resp = &res, 5772 }; 5773 unsigned int npages; 5774 int ret = -ENOMEM, i; 5775 struct nfs_server *server = NFS_SERVER(inode); 5776 5777 if (buflen == 0) 5778 buflen = server->rsize; 5779 5780 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5781 pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS); 5782 if (!pages) 5783 return -ENOMEM; 5784 5785 args.acl_pages = pages; 5786 5787 for (i = 0; i < npages; i++) { 5788 pages[i] = alloc_page(GFP_KERNEL); 5789 if (!pages[i]) 5790 goto out_free; 5791 } 5792 5793 /* for decoding across pages */ 5794 res.acl_scratch = alloc_page(GFP_KERNEL); 5795 if (!res.acl_scratch) 5796 goto out_free; 5797 5798 args.acl_len = npages * PAGE_SIZE; 5799 5800 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5801 __func__, buf, buflen, npages, args.acl_len); 5802 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5803 &msg, &args.seq_args, &res.seq_res, 0); 5804 if (ret) 5805 goto out_free; 5806 5807 /* Handle the case where the passed-in buffer is too short */ 5808 if (res.acl_flags & NFS4_ACL_TRUNC) { 5809 /* Did the user only issue a request for the acl length? */ 5810 if (buf == NULL) 5811 goto out_ok; 5812 ret = -ERANGE; 5813 goto out_free; 5814 } 5815 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 5816 if (buf) { 5817 if (res.acl_len > buflen) { 5818 ret = -ERANGE; 5819 goto out_free; 5820 } 5821 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5822 } 5823 out_ok: 5824 ret = res.acl_len; 5825 out_free: 5826 for (i = 0; i < npages; i++) 5827 if (pages[i]) 5828 __free_page(pages[i]); 5829 if (res.acl_scratch) 5830 __free_page(res.acl_scratch); 5831 kfree(pages); 5832 return ret; 5833 } 5834 5835 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5836 { 5837 struct nfs4_exception exception = { 5838 .interruptible = true, 5839 }; 5840 ssize_t ret; 5841 do { 5842 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 5843 trace_nfs4_get_acl(inode, ret); 5844 if (ret >= 0) 5845 break; 5846 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 5847 } while (exception.retry); 5848 return ret; 5849 } 5850 5851 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 5852 { 5853 struct nfs_server *server = NFS_SERVER(inode); 5854 int ret; 5855 5856 if (!nfs4_server_supports_acls(server)) 5857 return -EOPNOTSUPP; 5858 ret = nfs_revalidate_inode(server, inode); 5859 if (ret < 0) 5860 return ret; 5861 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 5862 nfs_zap_acl_cache(inode); 5863 ret = nfs4_read_cached_acl(inode, buf, buflen); 5864 if (ret != -ENOENT) 5865 /* -ENOENT is returned if there is no ACL or if there is an ACL 5866 * but no cached acl data, just the acl length */ 5867 return ret; 5868 return nfs4_get_acl_uncached(inode, buf, buflen); 5869 } 5870 5871 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5872 { 5873 struct nfs_server *server = NFS_SERVER(inode); 5874 struct page *pages[NFS4ACL_MAXPAGES]; 5875 struct nfs_setaclargs arg = { 5876 .fh = NFS_FH(inode), 5877 .acl_pages = pages, 5878 .acl_len = buflen, 5879 }; 5880 struct nfs_setaclres res; 5881 struct rpc_message msg = { 5882 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 5883 .rpc_argp = &arg, 5884 .rpc_resp = &res, 5885 }; 5886 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 5887 int ret, i; 5888 5889 if (!nfs4_server_supports_acls(server)) 5890 return -EOPNOTSUPP; 5891 if (npages > ARRAY_SIZE(pages)) 5892 return -ERANGE; 5893 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 5894 if (i < 0) 5895 return i; 5896 nfs4_inode_make_writeable(inode); 5897 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5898 5899 /* 5900 * Free each page after tx, so the only ref left is 5901 * held by the network stack 5902 */ 5903 for (; i > 0; i--) 5904 put_page(pages[i-1]); 5905 5906 /* 5907 * Acl update can result in inode attribute update. 5908 * so mark the attribute cache invalid. 5909 */ 5910 spin_lock(&inode->i_lock); 5911 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 5912 | NFS_INO_INVALID_CTIME 5913 | NFS_INO_REVAL_FORCED; 5914 spin_unlock(&inode->i_lock); 5915 nfs_access_zap_cache(inode); 5916 nfs_zap_acl_cache(inode); 5917 return ret; 5918 } 5919 5920 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5921 { 5922 struct nfs4_exception exception = { }; 5923 int err; 5924 do { 5925 err = __nfs4_proc_set_acl(inode, buf, buflen); 5926 trace_nfs4_set_acl(inode, err); 5927 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5928 &exception); 5929 } while (exception.retry); 5930 return err; 5931 } 5932 5933 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5934 static int _nfs4_get_security_label(struct inode *inode, void *buf, 5935 size_t buflen) 5936 { 5937 struct nfs_server *server = NFS_SERVER(inode); 5938 struct nfs_fattr fattr; 5939 struct nfs4_label label = {0, 0, buflen, buf}; 5940 5941 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5942 struct nfs4_getattr_arg arg = { 5943 .fh = NFS_FH(inode), 5944 .bitmask = bitmask, 5945 }; 5946 struct nfs4_getattr_res res = { 5947 .fattr = &fattr, 5948 .label = &label, 5949 .server = server, 5950 }; 5951 struct rpc_message msg = { 5952 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 5953 .rpc_argp = &arg, 5954 .rpc_resp = &res, 5955 }; 5956 int ret; 5957 5958 nfs_fattr_init(&fattr); 5959 5960 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 5961 if (ret) 5962 return ret; 5963 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 5964 return -ENOENT; 5965 return 0; 5966 } 5967 5968 static int nfs4_get_security_label(struct inode *inode, void *buf, 5969 size_t buflen) 5970 { 5971 struct nfs4_exception exception = { 5972 .interruptible = true, 5973 }; 5974 int err; 5975 5976 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5977 return -EOPNOTSUPP; 5978 5979 do { 5980 err = _nfs4_get_security_label(inode, buf, buflen); 5981 trace_nfs4_get_security_label(inode, err); 5982 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5983 &exception); 5984 } while (exception.retry); 5985 return err; 5986 } 5987 5988 static int _nfs4_do_set_security_label(struct inode *inode, 5989 struct nfs4_label *ilabel, 5990 struct nfs_fattr *fattr, 5991 struct nfs4_label *olabel) 5992 { 5993 5994 struct iattr sattr = {0}; 5995 struct nfs_server *server = NFS_SERVER(inode); 5996 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5997 struct nfs_setattrargs arg = { 5998 .fh = NFS_FH(inode), 5999 .iap = &sattr, 6000 .server = server, 6001 .bitmask = bitmask, 6002 .label = ilabel, 6003 }; 6004 struct nfs_setattrres res = { 6005 .fattr = fattr, 6006 .label = olabel, 6007 .server = server, 6008 }; 6009 struct rpc_message msg = { 6010 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6011 .rpc_argp = &arg, 6012 .rpc_resp = &res, 6013 }; 6014 int status; 6015 6016 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6017 6018 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6019 if (status) 6020 dprintk("%s failed: %d\n", __func__, status); 6021 6022 return status; 6023 } 6024 6025 static int nfs4_do_set_security_label(struct inode *inode, 6026 struct nfs4_label *ilabel, 6027 struct nfs_fattr *fattr, 6028 struct nfs4_label *olabel) 6029 { 6030 struct nfs4_exception exception = { }; 6031 int err; 6032 6033 do { 6034 err = _nfs4_do_set_security_label(inode, ilabel, 6035 fattr, olabel); 6036 trace_nfs4_set_security_label(inode, err); 6037 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6038 &exception); 6039 } while (exception.retry); 6040 return err; 6041 } 6042 6043 static int 6044 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6045 { 6046 struct nfs4_label ilabel, *olabel = NULL; 6047 struct nfs_fattr fattr; 6048 int status; 6049 6050 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6051 return -EOPNOTSUPP; 6052 6053 nfs_fattr_init(&fattr); 6054 6055 ilabel.pi = 0; 6056 ilabel.lfs = 0; 6057 ilabel.label = (char *)buf; 6058 ilabel.len = buflen; 6059 6060 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 6061 if (IS_ERR(olabel)) { 6062 status = -PTR_ERR(olabel); 6063 goto out; 6064 } 6065 6066 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 6067 if (status == 0) 6068 nfs_setsecurity(inode, &fattr, olabel); 6069 6070 nfs4_label_free(olabel); 6071 out: 6072 return status; 6073 } 6074 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6075 6076 6077 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6078 nfs4_verifier *bootverf) 6079 { 6080 __be32 verf[2]; 6081 6082 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6083 /* An impossible timestamp guarantees this value 6084 * will never match a generated boot time. */ 6085 verf[0] = cpu_to_be32(U32_MAX); 6086 verf[1] = cpu_to_be32(U32_MAX); 6087 } else { 6088 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6089 u64 ns = ktime_to_ns(nn->boot_time); 6090 6091 verf[0] = cpu_to_be32(ns >> 32); 6092 verf[1] = cpu_to_be32(ns); 6093 } 6094 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6095 } 6096 6097 static size_t 6098 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6099 { 6100 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6101 struct nfs_netns_client *nn_clp = nn->nfs_client; 6102 const char *id; 6103 6104 buf[0] = '\0'; 6105 6106 if (nn_clp) { 6107 rcu_read_lock(); 6108 id = rcu_dereference(nn_clp->identifier); 6109 if (id) 6110 strscpy(buf, id, buflen); 6111 rcu_read_unlock(); 6112 } 6113 6114 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6115 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6116 6117 return strlen(buf); 6118 } 6119 6120 static int 6121 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6122 { 6123 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6124 size_t buflen; 6125 size_t len; 6126 char *str; 6127 6128 if (clp->cl_owner_id != NULL) 6129 return 0; 6130 6131 rcu_read_lock(); 6132 len = 14 + 6133 strlen(clp->cl_rpcclient->cl_nodename) + 6134 1 + 6135 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6136 1; 6137 rcu_read_unlock(); 6138 6139 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6140 if (buflen) 6141 len += buflen + 1; 6142 6143 if (len > NFS4_OPAQUE_LIMIT + 1) 6144 return -EINVAL; 6145 6146 /* 6147 * Since this string is allocated at mount time, and held until the 6148 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6149 * about a memory-reclaim deadlock. 6150 */ 6151 str = kmalloc(len, GFP_KERNEL); 6152 if (!str) 6153 return -ENOMEM; 6154 6155 rcu_read_lock(); 6156 if (buflen) 6157 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6158 clp->cl_rpcclient->cl_nodename, buf, 6159 rpc_peeraddr2str(clp->cl_rpcclient, 6160 RPC_DISPLAY_ADDR)); 6161 else 6162 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6163 clp->cl_rpcclient->cl_nodename, 6164 rpc_peeraddr2str(clp->cl_rpcclient, 6165 RPC_DISPLAY_ADDR)); 6166 rcu_read_unlock(); 6167 6168 clp->cl_owner_id = str; 6169 return 0; 6170 } 6171 6172 static int 6173 nfs4_init_uniform_client_string(struct nfs_client *clp) 6174 { 6175 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6176 size_t buflen; 6177 size_t len; 6178 char *str; 6179 6180 if (clp->cl_owner_id != NULL) 6181 return 0; 6182 6183 len = 10 + 10 + 1 + 10 + 1 + 6184 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6185 6186 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6187 if (buflen) 6188 len += buflen + 1; 6189 6190 if (len > NFS4_OPAQUE_LIMIT + 1) 6191 return -EINVAL; 6192 6193 /* 6194 * Since this string is allocated at mount time, and held until the 6195 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6196 * about a memory-reclaim deadlock. 6197 */ 6198 str = kmalloc(len, GFP_KERNEL); 6199 if (!str) 6200 return -ENOMEM; 6201 6202 if (buflen) 6203 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6204 clp->rpc_ops->version, clp->cl_minorversion, 6205 buf, clp->cl_rpcclient->cl_nodename); 6206 else 6207 scnprintf(str, len, "Linux NFSv%u.%u %s", 6208 clp->rpc_ops->version, clp->cl_minorversion, 6209 clp->cl_rpcclient->cl_nodename); 6210 clp->cl_owner_id = str; 6211 return 0; 6212 } 6213 6214 /* 6215 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6216 * services. Advertise one based on the address family of the 6217 * clientaddr. 6218 */ 6219 static unsigned int 6220 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6221 { 6222 if (strchr(clp->cl_ipaddr, ':') != NULL) 6223 return scnprintf(buf, len, "tcp6"); 6224 else 6225 return scnprintf(buf, len, "tcp"); 6226 } 6227 6228 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6229 { 6230 struct nfs4_setclientid *sc = calldata; 6231 6232 if (task->tk_status == 0) 6233 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6234 } 6235 6236 static const struct rpc_call_ops nfs4_setclientid_ops = { 6237 .rpc_call_done = nfs4_setclientid_done, 6238 }; 6239 6240 /** 6241 * nfs4_proc_setclientid - Negotiate client ID 6242 * @clp: state data structure 6243 * @program: RPC program for NFSv4 callback service 6244 * @port: IP port number for NFS4 callback service 6245 * @cred: credential to use for this call 6246 * @res: where to place the result 6247 * 6248 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6249 */ 6250 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6251 unsigned short port, const struct cred *cred, 6252 struct nfs4_setclientid_res *res) 6253 { 6254 nfs4_verifier sc_verifier; 6255 struct nfs4_setclientid setclientid = { 6256 .sc_verifier = &sc_verifier, 6257 .sc_prog = program, 6258 .sc_clnt = clp, 6259 }; 6260 struct rpc_message msg = { 6261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6262 .rpc_argp = &setclientid, 6263 .rpc_resp = res, 6264 .rpc_cred = cred, 6265 }; 6266 struct rpc_task_setup task_setup_data = { 6267 .rpc_client = clp->cl_rpcclient, 6268 .rpc_message = &msg, 6269 .callback_ops = &nfs4_setclientid_ops, 6270 .callback_data = &setclientid, 6271 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6272 }; 6273 unsigned long now = jiffies; 6274 int status; 6275 6276 /* nfs_client_id4 */ 6277 nfs4_init_boot_verifier(clp, &sc_verifier); 6278 6279 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6280 status = nfs4_init_uniform_client_string(clp); 6281 else 6282 status = nfs4_init_nonuniform_client_string(clp); 6283 6284 if (status) 6285 goto out; 6286 6287 /* cb_client4 */ 6288 setclientid.sc_netid_len = 6289 nfs4_init_callback_netid(clp, 6290 setclientid.sc_netid, 6291 sizeof(setclientid.sc_netid)); 6292 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6293 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6294 clp->cl_ipaddr, port >> 8, port & 255); 6295 6296 dprintk("NFS call setclientid auth=%s, '%s'\n", 6297 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6298 clp->cl_owner_id); 6299 6300 status = nfs4_call_sync_custom(&task_setup_data); 6301 if (setclientid.sc_cred) { 6302 kfree(clp->cl_acceptor); 6303 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6304 put_rpccred(setclientid.sc_cred); 6305 } 6306 6307 if (status == 0) 6308 do_renew_lease(clp, now); 6309 out: 6310 trace_nfs4_setclientid(clp, status); 6311 dprintk("NFS reply setclientid: %d\n", status); 6312 return status; 6313 } 6314 6315 /** 6316 * nfs4_proc_setclientid_confirm - Confirm client ID 6317 * @clp: state data structure 6318 * @arg: result of a previous SETCLIENTID 6319 * @cred: credential to use for this call 6320 * 6321 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6322 */ 6323 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6324 struct nfs4_setclientid_res *arg, 6325 const struct cred *cred) 6326 { 6327 struct rpc_message msg = { 6328 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6329 .rpc_argp = arg, 6330 .rpc_cred = cred, 6331 }; 6332 int status; 6333 6334 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6335 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6336 clp->cl_clientid); 6337 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6338 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6339 trace_nfs4_setclientid_confirm(clp, status); 6340 dprintk("NFS reply setclientid_confirm: %d\n", status); 6341 return status; 6342 } 6343 6344 struct nfs4_delegreturndata { 6345 struct nfs4_delegreturnargs args; 6346 struct nfs4_delegreturnres res; 6347 struct nfs_fh fh; 6348 nfs4_stateid stateid; 6349 unsigned long timestamp; 6350 struct { 6351 struct nfs4_layoutreturn_args arg; 6352 struct nfs4_layoutreturn_res res; 6353 struct nfs4_xdr_opaque_data ld_private; 6354 u32 roc_barrier; 6355 bool roc; 6356 } lr; 6357 struct nfs_fattr fattr; 6358 int rpc_status; 6359 struct inode *inode; 6360 }; 6361 6362 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6363 { 6364 struct nfs4_delegreturndata *data = calldata; 6365 struct nfs4_exception exception = { 6366 .inode = data->inode, 6367 .stateid = &data->stateid, 6368 }; 6369 6370 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6371 return; 6372 6373 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6374 6375 /* Handle Layoutreturn errors */ 6376 if (pnfs_roc_done(task, data->inode, 6377 &data->args.lr_args, 6378 &data->res.lr_res, 6379 &data->res.lr_ret) == -EAGAIN) 6380 goto out_restart; 6381 6382 switch (task->tk_status) { 6383 case 0: 6384 renew_lease(data->res.server, data->timestamp); 6385 break; 6386 case -NFS4ERR_ADMIN_REVOKED: 6387 case -NFS4ERR_DELEG_REVOKED: 6388 case -NFS4ERR_EXPIRED: 6389 nfs4_free_revoked_stateid(data->res.server, 6390 data->args.stateid, 6391 task->tk_msg.rpc_cred); 6392 fallthrough; 6393 case -NFS4ERR_BAD_STATEID: 6394 case -NFS4ERR_STALE_STATEID: 6395 case -ETIMEDOUT: 6396 task->tk_status = 0; 6397 break; 6398 case -NFS4ERR_OLD_STATEID: 6399 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6400 nfs4_stateid_seqid_inc(&data->stateid); 6401 if (data->args.bitmask) { 6402 data->args.bitmask = NULL; 6403 data->res.fattr = NULL; 6404 } 6405 goto out_restart; 6406 case -NFS4ERR_ACCESS: 6407 if (data->args.bitmask) { 6408 data->args.bitmask = NULL; 6409 data->res.fattr = NULL; 6410 goto out_restart; 6411 } 6412 fallthrough; 6413 default: 6414 task->tk_status = nfs4_async_handle_exception(task, 6415 data->res.server, task->tk_status, 6416 &exception); 6417 if (exception.retry) 6418 goto out_restart; 6419 } 6420 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6421 data->rpc_status = task->tk_status; 6422 return; 6423 out_restart: 6424 task->tk_status = 0; 6425 rpc_restart_call_prepare(task); 6426 } 6427 6428 static void nfs4_delegreturn_release(void *calldata) 6429 { 6430 struct nfs4_delegreturndata *data = calldata; 6431 struct inode *inode = data->inode; 6432 6433 if (inode) { 6434 if (data->lr.roc) 6435 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6436 data->res.lr_ret); 6437 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 6438 nfs_iput_and_deactive(inode); 6439 } 6440 kfree(calldata); 6441 } 6442 6443 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6444 { 6445 struct nfs4_delegreturndata *d_data; 6446 struct pnfs_layout_hdr *lo; 6447 6448 d_data = (struct nfs4_delegreturndata *)data; 6449 6450 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6451 nfs4_sequence_done(task, &d_data->res.seq_res); 6452 return; 6453 } 6454 6455 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6456 if (lo && !pnfs_layout_is_valid(lo)) { 6457 d_data->args.lr_args = NULL; 6458 d_data->res.lr_res = NULL; 6459 } 6460 6461 nfs4_setup_sequence(d_data->res.server->nfs_client, 6462 &d_data->args.seq_args, 6463 &d_data->res.seq_res, 6464 task); 6465 } 6466 6467 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6468 .rpc_call_prepare = nfs4_delegreturn_prepare, 6469 .rpc_call_done = nfs4_delegreturn_done, 6470 .rpc_release = nfs4_delegreturn_release, 6471 }; 6472 6473 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6474 { 6475 struct nfs4_delegreturndata *data; 6476 struct nfs_server *server = NFS_SERVER(inode); 6477 struct rpc_task *task; 6478 struct rpc_message msg = { 6479 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6480 .rpc_cred = cred, 6481 }; 6482 struct rpc_task_setup task_setup_data = { 6483 .rpc_client = server->client, 6484 .rpc_message = &msg, 6485 .callback_ops = &nfs4_delegreturn_ops, 6486 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6487 }; 6488 int status = 0; 6489 6490 data = kzalloc(sizeof(*data), GFP_NOFS); 6491 if (data == NULL) 6492 return -ENOMEM; 6493 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 6494 6495 nfs4_state_protect(server->nfs_client, 6496 NFS_SP4_MACH_CRED_CLEANUP, 6497 &task_setup_data.rpc_client, &msg); 6498 6499 data->args.fhandle = &data->fh; 6500 data->args.stateid = &data->stateid; 6501 data->args.bitmask = server->cache_consistency_bitmask; 6502 nfs4_bitmask_adjust(data->args.bitmask, inode, server, NULL); 6503 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6504 nfs4_stateid_copy(&data->stateid, stateid); 6505 data->res.fattr = &data->fattr; 6506 data->res.server = server; 6507 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6508 data->lr.arg.ld_private = &data->lr.ld_private; 6509 nfs_fattr_init(data->res.fattr); 6510 data->timestamp = jiffies; 6511 data->rpc_status = 0; 6512 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred); 6513 data->inode = nfs_igrab_and_active(inode); 6514 if (data->inode) { 6515 if (data->lr.roc) { 6516 data->args.lr_args = &data->lr.arg; 6517 data->res.lr_res = &data->lr.res; 6518 } 6519 } else if (data->lr.roc) { 6520 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0); 6521 data->lr.roc = false; 6522 } 6523 6524 task_setup_data.callback_data = data; 6525 msg.rpc_argp = &data->args; 6526 msg.rpc_resp = &data->res; 6527 task = rpc_run_task(&task_setup_data); 6528 if (IS_ERR(task)) 6529 return PTR_ERR(task); 6530 if (!issync) 6531 goto out; 6532 status = rpc_wait_for_completion_task(task); 6533 if (status != 0) 6534 goto out; 6535 status = data->rpc_status; 6536 out: 6537 rpc_put_task(task); 6538 return status; 6539 } 6540 6541 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6542 { 6543 struct nfs_server *server = NFS_SERVER(inode); 6544 struct nfs4_exception exception = { }; 6545 int err; 6546 do { 6547 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6548 trace_nfs4_delegreturn(inode, stateid, err); 6549 switch (err) { 6550 case -NFS4ERR_STALE_STATEID: 6551 case -NFS4ERR_EXPIRED: 6552 case 0: 6553 return 0; 6554 } 6555 err = nfs4_handle_exception(server, err, &exception); 6556 } while (exception.retry); 6557 return err; 6558 } 6559 6560 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6561 { 6562 struct inode *inode = state->inode; 6563 struct nfs_server *server = NFS_SERVER(inode); 6564 struct nfs_client *clp = server->nfs_client; 6565 struct nfs_lockt_args arg = { 6566 .fh = NFS_FH(inode), 6567 .fl = request, 6568 }; 6569 struct nfs_lockt_res res = { 6570 .denied = request, 6571 }; 6572 struct rpc_message msg = { 6573 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6574 .rpc_argp = &arg, 6575 .rpc_resp = &res, 6576 .rpc_cred = state->owner->so_cred, 6577 }; 6578 struct nfs4_lock_state *lsp; 6579 int status; 6580 6581 arg.lock_owner.clientid = clp->cl_clientid; 6582 status = nfs4_set_lock_state(state, request); 6583 if (status != 0) 6584 goto out; 6585 lsp = request->fl_u.nfs4_fl.owner; 6586 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6587 arg.lock_owner.s_dev = server->s_dev; 6588 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6589 switch (status) { 6590 case 0: 6591 request->fl_type = F_UNLCK; 6592 break; 6593 case -NFS4ERR_DENIED: 6594 status = 0; 6595 } 6596 request->fl_ops->fl_release_private(request); 6597 request->fl_ops = NULL; 6598 out: 6599 return status; 6600 } 6601 6602 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6603 { 6604 struct nfs4_exception exception = { 6605 .interruptible = true, 6606 }; 6607 int err; 6608 6609 do { 6610 err = _nfs4_proc_getlk(state, cmd, request); 6611 trace_nfs4_get_lock(request, state, cmd, err); 6612 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6613 &exception); 6614 } while (exception.retry); 6615 return err; 6616 } 6617 6618 /* 6619 * Update the seqid of a lock stateid after receiving 6620 * NFS4ERR_OLD_STATEID 6621 */ 6622 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6623 struct nfs4_lock_state *lsp) 6624 { 6625 struct nfs4_state *state = lsp->ls_state; 6626 bool ret = false; 6627 6628 spin_lock(&state->state_lock); 6629 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6630 goto out; 6631 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6632 nfs4_stateid_seqid_inc(dst); 6633 else 6634 dst->seqid = lsp->ls_stateid.seqid; 6635 ret = true; 6636 out: 6637 spin_unlock(&state->state_lock); 6638 return ret; 6639 } 6640 6641 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6642 struct nfs4_lock_state *lsp) 6643 { 6644 struct nfs4_state *state = lsp->ls_state; 6645 bool ret; 6646 6647 spin_lock(&state->state_lock); 6648 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6649 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6650 spin_unlock(&state->state_lock); 6651 return ret; 6652 } 6653 6654 struct nfs4_unlockdata { 6655 struct nfs_locku_args arg; 6656 struct nfs_locku_res res; 6657 struct nfs4_lock_state *lsp; 6658 struct nfs_open_context *ctx; 6659 struct nfs_lock_context *l_ctx; 6660 struct file_lock fl; 6661 struct nfs_server *server; 6662 unsigned long timestamp; 6663 }; 6664 6665 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6666 struct nfs_open_context *ctx, 6667 struct nfs4_lock_state *lsp, 6668 struct nfs_seqid *seqid) 6669 { 6670 struct nfs4_unlockdata *p; 6671 struct nfs4_state *state = lsp->ls_state; 6672 struct inode *inode = state->inode; 6673 6674 p = kzalloc(sizeof(*p), GFP_NOFS); 6675 if (p == NULL) 6676 return NULL; 6677 p->arg.fh = NFS_FH(inode); 6678 p->arg.fl = &p->fl; 6679 p->arg.seqid = seqid; 6680 p->res.seqid = seqid; 6681 p->lsp = lsp; 6682 /* Ensure we don't close file until we're done freeing locks! */ 6683 p->ctx = get_nfs_open_context(ctx); 6684 p->l_ctx = nfs_get_lock_context(ctx); 6685 locks_init_lock(&p->fl); 6686 locks_copy_lock(&p->fl, fl); 6687 p->server = NFS_SERVER(inode); 6688 spin_lock(&state->state_lock); 6689 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6690 spin_unlock(&state->state_lock); 6691 return p; 6692 } 6693 6694 static void nfs4_locku_release_calldata(void *data) 6695 { 6696 struct nfs4_unlockdata *calldata = data; 6697 nfs_free_seqid(calldata->arg.seqid); 6698 nfs4_put_lock_state(calldata->lsp); 6699 nfs_put_lock_context(calldata->l_ctx); 6700 put_nfs_open_context(calldata->ctx); 6701 kfree(calldata); 6702 } 6703 6704 static void nfs4_locku_done(struct rpc_task *task, void *data) 6705 { 6706 struct nfs4_unlockdata *calldata = data; 6707 struct nfs4_exception exception = { 6708 .inode = calldata->lsp->ls_state->inode, 6709 .stateid = &calldata->arg.stateid, 6710 }; 6711 6712 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6713 return; 6714 switch (task->tk_status) { 6715 case 0: 6716 renew_lease(calldata->server, calldata->timestamp); 6717 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6718 if (nfs4_update_lock_stateid(calldata->lsp, 6719 &calldata->res.stateid)) 6720 break; 6721 fallthrough; 6722 case -NFS4ERR_ADMIN_REVOKED: 6723 case -NFS4ERR_EXPIRED: 6724 nfs4_free_revoked_stateid(calldata->server, 6725 &calldata->arg.stateid, 6726 task->tk_msg.rpc_cred); 6727 fallthrough; 6728 case -NFS4ERR_BAD_STATEID: 6729 case -NFS4ERR_STALE_STATEID: 6730 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6731 calldata->lsp)) 6732 rpc_restart_call_prepare(task); 6733 break; 6734 case -NFS4ERR_OLD_STATEID: 6735 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6736 calldata->lsp)) 6737 rpc_restart_call_prepare(task); 6738 break; 6739 default: 6740 task->tk_status = nfs4_async_handle_exception(task, 6741 calldata->server, task->tk_status, 6742 &exception); 6743 if (exception.retry) 6744 rpc_restart_call_prepare(task); 6745 } 6746 nfs_release_seqid(calldata->arg.seqid); 6747 } 6748 6749 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6750 { 6751 struct nfs4_unlockdata *calldata = data; 6752 6753 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6754 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6755 return; 6756 6757 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6758 goto out_wait; 6759 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6760 /* Note: exit _without_ running nfs4_locku_done */ 6761 goto out_no_action; 6762 } 6763 calldata->timestamp = jiffies; 6764 if (nfs4_setup_sequence(calldata->server->nfs_client, 6765 &calldata->arg.seq_args, 6766 &calldata->res.seq_res, 6767 task) != 0) 6768 nfs_release_seqid(calldata->arg.seqid); 6769 return; 6770 out_no_action: 6771 task->tk_action = NULL; 6772 out_wait: 6773 nfs4_sequence_done(task, &calldata->res.seq_res); 6774 } 6775 6776 static const struct rpc_call_ops nfs4_locku_ops = { 6777 .rpc_call_prepare = nfs4_locku_prepare, 6778 .rpc_call_done = nfs4_locku_done, 6779 .rpc_release = nfs4_locku_release_calldata, 6780 }; 6781 6782 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6783 struct nfs_open_context *ctx, 6784 struct nfs4_lock_state *lsp, 6785 struct nfs_seqid *seqid) 6786 { 6787 struct nfs4_unlockdata *data; 6788 struct rpc_message msg = { 6789 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6790 .rpc_cred = ctx->cred, 6791 }; 6792 struct rpc_task_setup task_setup_data = { 6793 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6794 .rpc_message = &msg, 6795 .callback_ops = &nfs4_locku_ops, 6796 .workqueue = nfsiod_workqueue, 6797 .flags = RPC_TASK_ASYNC, 6798 }; 6799 6800 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6801 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6802 6803 /* Ensure this is an unlock - when canceling a lock, the 6804 * canceled lock is passed in, and it won't be an unlock. 6805 */ 6806 fl->fl_type = F_UNLCK; 6807 if (fl->fl_flags & FL_CLOSE) 6808 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6809 6810 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6811 if (data == NULL) { 6812 nfs_free_seqid(seqid); 6813 return ERR_PTR(-ENOMEM); 6814 } 6815 6816 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6817 msg.rpc_argp = &data->arg; 6818 msg.rpc_resp = &data->res; 6819 task_setup_data.callback_data = data; 6820 return rpc_run_task(&task_setup_data); 6821 } 6822 6823 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6824 { 6825 struct inode *inode = state->inode; 6826 struct nfs4_state_owner *sp = state->owner; 6827 struct nfs_inode *nfsi = NFS_I(inode); 6828 struct nfs_seqid *seqid; 6829 struct nfs4_lock_state *lsp; 6830 struct rpc_task *task; 6831 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6832 int status = 0; 6833 unsigned char fl_flags = request->fl_flags; 6834 6835 status = nfs4_set_lock_state(state, request); 6836 /* Unlock _before_ we do the RPC call */ 6837 request->fl_flags |= FL_EXISTS; 6838 /* Exclude nfs_delegation_claim_locks() */ 6839 mutex_lock(&sp->so_delegreturn_mutex); 6840 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 6841 down_read(&nfsi->rwsem); 6842 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 6843 up_read(&nfsi->rwsem); 6844 mutex_unlock(&sp->so_delegreturn_mutex); 6845 goto out; 6846 } 6847 up_read(&nfsi->rwsem); 6848 mutex_unlock(&sp->so_delegreturn_mutex); 6849 if (status != 0) 6850 goto out; 6851 /* Is this a delegated lock? */ 6852 lsp = request->fl_u.nfs4_fl.owner; 6853 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 6854 goto out; 6855 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 6856 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 6857 status = -ENOMEM; 6858 if (IS_ERR(seqid)) 6859 goto out; 6860 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 6861 status = PTR_ERR(task); 6862 if (IS_ERR(task)) 6863 goto out; 6864 status = rpc_wait_for_completion_task(task); 6865 rpc_put_task(task); 6866 out: 6867 request->fl_flags = fl_flags; 6868 trace_nfs4_unlock(request, state, F_SETLK, status); 6869 return status; 6870 } 6871 6872 struct nfs4_lockdata { 6873 struct nfs_lock_args arg; 6874 struct nfs_lock_res res; 6875 struct nfs4_lock_state *lsp; 6876 struct nfs_open_context *ctx; 6877 struct file_lock fl; 6878 unsigned long timestamp; 6879 int rpc_status; 6880 int cancelled; 6881 struct nfs_server *server; 6882 }; 6883 6884 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 6885 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 6886 gfp_t gfp_mask) 6887 { 6888 struct nfs4_lockdata *p; 6889 struct inode *inode = lsp->ls_state->inode; 6890 struct nfs_server *server = NFS_SERVER(inode); 6891 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6892 6893 p = kzalloc(sizeof(*p), gfp_mask); 6894 if (p == NULL) 6895 return NULL; 6896 6897 p->arg.fh = NFS_FH(inode); 6898 p->arg.fl = &p->fl; 6899 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 6900 if (IS_ERR(p->arg.open_seqid)) 6901 goto out_free; 6902 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 6903 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 6904 if (IS_ERR(p->arg.lock_seqid)) 6905 goto out_free_seqid; 6906 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 6907 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 6908 p->arg.lock_owner.s_dev = server->s_dev; 6909 p->res.lock_seqid = p->arg.lock_seqid; 6910 p->lsp = lsp; 6911 p->server = server; 6912 p->ctx = get_nfs_open_context(ctx); 6913 locks_init_lock(&p->fl); 6914 locks_copy_lock(&p->fl, fl); 6915 return p; 6916 out_free_seqid: 6917 nfs_free_seqid(p->arg.open_seqid); 6918 out_free: 6919 kfree(p); 6920 return NULL; 6921 } 6922 6923 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 6924 { 6925 struct nfs4_lockdata *data = calldata; 6926 struct nfs4_state *state = data->lsp->ls_state; 6927 6928 dprintk("%s: begin!\n", __func__); 6929 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 6930 goto out_wait; 6931 /* Do we need to do an open_to_lock_owner? */ 6932 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 6933 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 6934 goto out_release_lock_seqid; 6935 } 6936 nfs4_stateid_copy(&data->arg.open_stateid, 6937 &state->open_stateid); 6938 data->arg.new_lock_owner = 1; 6939 data->res.open_seqid = data->arg.open_seqid; 6940 } else { 6941 data->arg.new_lock_owner = 0; 6942 nfs4_stateid_copy(&data->arg.lock_stateid, 6943 &data->lsp->ls_stateid); 6944 } 6945 if (!nfs4_valid_open_stateid(state)) { 6946 data->rpc_status = -EBADF; 6947 task->tk_action = NULL; 6948 goto out_release_open_seqid; 6949 } 6950 data->timestamp = jiffies; 6951 if (nfs4_setup_sequence(data->server->nfs_client, 6952 &data->arg.seq_args, 6953 &data->res.seq_res, 6954 task) == 0) 6955 return; 6956 out_release_open_seqid: 6957 nfs_release_seqid(data->arg.open_seqid); 6958 out_release_lock_seqid: 6959 nfs_release_seqid(data->arg.lock_seqid); 6960 out_wait: 6961 nfs4_sequence_done(task, &data->res.seq_res); 6962 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 6963 } 6964 6965 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 6966 { 6967 struct nfs4_lockdata *data = calldata; 6968 struct nfs4_lock_state *lsp = data->lsp; 6969 6970 dprintk("%s: begin!\n", __func__); 6971 6972 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6973 return; 6974 6975 data->rpc_status = task->tk_status; 6976 switch (task->tk_status) { 6977 case 0: 6978 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 6979 data->timestamp); 6980 if (data->arg.new_lock && !data->cancelled) { 6981 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 6982 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 6983 goto out_restart; 6984 } 6985 if (data->arg.new_lock_owner != 0) { 6986 nfs_confirm_seqid(&lsp->ls_seqid, 0); 6987 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 6988 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6989 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 6990 goto out_restart; 6991 break; 6992 case -NFS4ERR_BAD_STATEID: 6993 case -NFS4ERR_OLD_STATEID: 6994 case -NFS4ERR_STALE_STATEID: 6995 case -NFS4ERR_EXPIRED: 6996 if (data->arg.new_lock_owner != 0) { 6997 if (!nfs4_stateid_match(&data->arg.open_stateid, 6998 &lsp->ls_state->open_stateid)) 6999 goto out_restart; 7000 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7001 &lsp->ls_stateid)) 7002 goto out_restart; 7003 } 7004 out_done: 7005 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 7006 return; 7007 out_restart: 7008 if (!data->cancelled) 7009 rpc_restart_call_prepare(task); 7010 goto out_done; 7011 } 7012 7013 static void nfs4_lock_release(void *calldata) 7014 { 7015 struct nfs4_lockdata *data = calldata; 7016 7017 dprintk("%s: begin!\n", __func__); 7018 nfs_free_seqid(data->arg.open_seqid); 7019 if (data->cancelled && data->rpc_status == 0) { 7020 struct rpc_task *task; 7021 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7022 data->arg.lock_seqid); 7023 if (!IS_ERR(task)) 7024 rpc_put_task_async(task); 7025 dprintk("%s: cancelling lock!\n", __func__); 7026 } else 7027 nfs_free_seqid(data->arg.lock_seqid); 7028 nfs4_put_lock_state(data->lsp); 7029 put_nfs_open_context(data->ctx); 7030 kfree(data); 7031 dprintk("%s: done!\n", __func__); 7032 } 7033 7034 static const struct rpc_call_ops nfs4_lock_ops = { 7035 .rpc_call_prepare = nfs4_lock_prepare, 7036 .rpc_call_done = nfs4_lock_done, 7037 .rpc_release = nfs4_lock_release, 7038 }; 7039 7040 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7041 { 7042 switch (error) { 7043 case -NFS4ERR_ADMIN_REVOKED: 7044 case -NFS4ERR_EXPIRED: 7045 case -NFS4ERR_BAD_STATEID: 7046 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7047 if (new_lock_owner != 0 || 7048 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7049 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7050 break; 7051 case -NFS4ERR_STALE_STATEID: 7052 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7053 nfs4_schedule_lease_recovery(server->nfs_client); 7054 } 7055 } 7056 7057 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7058 { 7059 struct nfs4_lockdata *data; 7060 struct rpc_task *task; 7061 struct rpc_message msg = { 7062 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7063 .rpc_cred = state->owner->so_cred, 7064 }; 7065 struct rpc_task_setup task_setup_data = { 7066 .rpc_client = NFS_CLIENT(state->inode), 7067 .rpc_message = &msg, 7068 .callback_ops = &nfs4_lock_ops, 7069 .workqueue = nfsiod_workqueue, 7070 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7071 }; 7072 int ret; 7073 7074 dprintk("%s: begin!\n", __func__); 7075 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7076 fl->fl_u.nfs4_fl.owner, 7077 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 7078 if (data == NULL) 7079 return -ENOMEM; 7080 if (IS_SETLKW(cmd)) 7081 data->arg.block = 1; 7082 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7083 recovery_type > NFS_LOCK_NEW); 7084 msg.rpc_argp = &data->arg; 7085 msg.rpc_resp = &data->res; 7086 task_setup_data.callback_data = data; 7087 if (recovery_type > NFS_LOCK_NEW) { 7088 if (recovery_type == NFS_LOCK_RECLAIM) 7089 data->arg.reclaim = NFS_LOCK_RECLAIM; 7090 } else 7091 data->arg.new_lock = 1; 7092 task = rpc_run_task(&task_setup_data); 7093 if (IS_ERR(task)) 7094 return PTR_ERR(task); 7095 ret = rpc_wait_for_completion_task(task); 7096 if (ret == 0) { 7097 ret = data->rpc_status; 7098 if (ret) 7099 nfs4_handle_setlk_error(data->server, data->lsp, 7100 data->arg.new_lock_owner, ret); 7101 } else 7102 data->cancelled = true; 7103 rpc_put_task(task); 7104 dprintk("%s: done, ret = %d!\n", __func__, ret); 7105 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7106 return ret; 7107 } 7108 7109 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7110 { 7111 struct nfs_server *server = NFS_SERVER(state->inode); 7112 struct nfs4_exception exception = { 7113 .inode = state->inode, 7114 }; 7115 int err; 7116 7117 do { 7118 /* Cache the lock if possible... */ 7119 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7120 return 0; 7121 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7122 if (err != -NFS4ERR_DELAY) 7123 break; 7124 nfs4_handle_exception(server, err, &exception); 7125 } while (exception.retry); 7126 return err; 7127 } 7128 7129 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7130 { 7131 struct nfs_server *server = NFS_SERVER(state->inode); 7132 struct nfs4_exception exception = { 7133 .inode = state->inode, 7134 }; 7135 int err; 7136 7137 err = nfs4_set_lock_state(state, request); 7138 if (err != 0) 7139 return err; 7140 if (!recover_lost_locks) { 7141 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7142 return 0; 7143 } 7144 do { 7145 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7146 return 0; 7147 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7148 switch (err) { 7149 default: 7150 goto out; 7151 case -NFS4ERR_GRACE: 7152 case -NFS4ERR_DELAY: 7153 nfs4_handle_exception(server, err, &exception); 7154 err = 0; 7155 } 7156 } while (exception.retry); 7157 out: 7158 return err; 7159 } 7160 7161 #if defined(CONFIG_NFS_V4_1) 7162 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7163 { 7164 struct nfs4_lock_state *lsp; 7165 int status; 7166 7167 status = nfs4_set_lock_state(state, request); 7168 if (status != 0) 7169 return status; 7170 lsp = request->fl_u.nfs4_fl.owner; 7171 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7172 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7173 return 0; 7174 return nfs4_lock_expired(state, request); 7175 } 7176 #endif 7177 7178 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7179 { 7180 struct nfs_inode *nfsi = NFS_I(state->inode); 7181 struct nfs4_state_owner *sp = state->owner; 7182 unsigned char fl_flags = request->fl_flags; 7183 int status; 7184 7185 request->fl_flags |= FL_ACCESS; 7186 status = locks_lock_inode_wait(state->inode, request); 7187 if (status < 0) 7188 goto out; 7189 mutex_lock(&sp->so_delegreturn_mutex); 7190 down_read(&nfsi->rwsem); 7191 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7192 /* Yes: cache locks! */ 7193 /* ...but avoid races with delegation recall... */ 7194 request->fl_flags = fl_flags & ~FL_SLEEP; 7195 status = locks_lock_inode_wait(state->inode, request); 7196 up_read(&nfsi->rwsem); 7197 mutex_unlock(&sp->so_delegreturn_mutex); 7198 goto out; 7199 } 7200 up_read(&nfsi->rwsem); 7201 mutex_unlock(&sp->so_delegreturn_mutex); 7202 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7203 out: 7204 request->fl_flags = fl_flags; 7205 return status; 7206 } 7207 7208 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7209 { 7210 struct nfs4_exception exception = { 7211 .state = state, 7212 .inode = state->inode, 7213 .interruptible = true, 7214 }; 7215 int err; 7216 7217 do { 7218 err = _nfs4_proc_setlk(state, cmd, request); 7219 if (err == -NFS4ERR_DENIED) 7220 err = -EAGAIN; 7221 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7222 err, &exception); 7223 } while (exception.retry); 7224 return err; 7225 } 7226 7227 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7228 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7229 7230 static int 7231 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7232 struct file_lock *request) 7233 { 7234 int status = -ERESTARTSYS; 7235 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7236 7237 while(!signalled()) { 7238 status = nfs4_proc_setlk(state, cmd, request); 7239 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7240 break; 7241 freezable_schedule_timeout_interruptible(timeout); 7242 timeout *= 2; 7243 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7244 status = -ERESTARTSYS; 7245 } 7246 return status; 7247 } 7248 7249 #ifdef CONFIG_NFS_V4_1 7250 struct nfs4_lock_waiter { 7251 struct task_struct *task; 7252 struct inode *inode; 7253 struct nfs_lowner *owner; 7254 }; 7255 7256 static int 7257 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7258 { 7259 int ret; 7260 struct nfs4_lock_waiter *waiter = wait->private; 7261 7262 /* NULL key means to wake up everyone */ 7263 if (key) { 7264 struct cb_notify_lock_args *cbnl = key; 7265 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7266 *wowner = waiter->owner; 7267 7268 /* Only wake if the callback was for the same owner. */ 7269 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7270 return 0; 7271 7272 /* Make sure it's for the right inode */ 7273 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7274 return 0; 7275 } 7276 7277 /* override "private" so we can use default_wake_function */ 7278 wait->private = waiter->task; 7279 ret = woken_wake_function(wait, mode, flags, key); 7280 if (ret) 7281 list_del_init(&wait->entry); 7282 wait->private = waiter; 7283 return ret; 7284 } 7285 7286 static int 7287 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7288 { 7289 int status = -ERESTARTSYS; 7290 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7291 struct nfs_server *server = NFS_SERVER(state->inode); 7292 struct nfs_client *clp = server->nfs_client; 7293 wait_queue_head_t *q = &clp->cl_lock_waitq; 7294 struct nfs_lowner owner = { .clientid = clp->cl_clientid, 7295 .id = lsp->ls_seqid.owner_id, 7296 .s_dev = server->s_dev }; 7297 struct nfs4_lock_waiter waiter = { .task = current, 7298 .inode = state->inode, 7299 .owner = &owner}; 7300 wait_queue_entry_t wait; 7301 7302 /* Don't bother with waitqueue if we don't expect a callback */ 7303 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7304 return nfs4_retry_setlk_simple(state, cmd, request); 7305 7306 init_wait(&wait); 7307 wait.private = &waiter; 7308 wait.func = nfs4_wake_lock_waiter; 7309 7310 while(!signalled()) { 7311 add_wait_queue(q, &wait); 7312 status = nfs4_proc_setlk(state, cmd, request); 7313 if ((status != -EAGAIN) || IS_SETLK(cmd)) { 7314 finish_wait(q, &wait); 7315 break; 7316 } 7317 7318 status = -ERESTARTSYS; 7319 freezer_do_not_count(); 7320 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT); 7321 freezer_count(); 7322 finish_wait(q, &wait); 7323 } 7324 7325 return status; 7326 } 7327 #else /* !CONFIG_NFS_V4_1 */ 7328 static inline int 7329 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7330 { 7331 return nfs4_retry_setlk_simple(state, cmd, request); 7332 } 7333 #endif 7334 7335 static int 7336 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7337 { 7338 struct nfs_open_context *ctx; 7339 struct nfs4_state *state; 7340 int status; 7341 7342 /* verify open state */ 7343 ctx = nfs_file_open_context(filp); 7344 state = ctx->state; 7345 7346 if (IS_GETLK(cmd)) { 7347 if (state != NULL) 7348 return nfs4_proc_getlk(state, F_GETLK, request); 7349 return 0; 7350 } 7351 7352 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7353 return -EINVAL; 7354 7355 if (request->fl_type == F_UNLCK) { 7356 if (state != NULL) 7357 return nfs4_proc_unlck(state, cmd, request); 7358 return 0; 7359 } 7360 7361 if (state == NULL) 7362 return -ENOLCK; 7363 7364 if ((request->fl_flags & FL_POSIX) && 7365 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7366 return -ENOLCK; 7367 7368 /* 7369 * Don't rely on the VFS having checked the file open mode, 7370 * since it won't do this for flock() locks. 7371 */ 7372 switch (request->fl_type) { 7373 case F_RDLCK: 7374 if (!(filp->f_mode & FMODE_READ)) 7375 return -EBADF; 7376 break; 7377 case F_WRLCK: 7378 if (!(filp->f_mode & FMODE_WRITE)) 7379 return -EBADF; 7380 } 7381 7382 status = nfs4_set_lock_state(state, request); 7383 if (status != 0) 7384 return status; 7385 7386 return nfs4_retry_setlk(state, cmd, request); 7387 } 7388 7389 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7390 { 7391 struct nfs_server *server = NFS_SERVER(state->inode); 7392 int err; 7393 7394 err = nfs4_set_lock_state(state, fl); 7395 if (err != 0) 7396 return err; 7397 do { 7398 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7399 if (err != -NFS4ERR_DELAY) 7400 break; 7401 ssleep(1); 7402 } while (err == -NFS4ERR_DELAY); 7403 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7404 } 7405 7406 struct nfs_release_lockowner_data { 7407 struct nfs4_lock_state *lsp; 7408 struct nfs_server *server; 7409 struct nfs_release_lockowner_args args; 7410 struct nfs_release_lockowner_res res; 7411 unsigned long timestamp; 7412 }; 7413 7414 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7415 { 7416 struct nfs_release_lockowner_data *data = calldata; 7417 struct nfs_server *server = data->server; 7418 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7419 &data->res.seq_res, task); 7420 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7421 data->timestamp = jiffies; 7422 } 7423 7424 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7425 { 7426 struct nfs_release_lockowner_data *data = calldata; 7427 struct nfs_server *server = data->server; 7428 7429 nfs40_sequence_done(task, &data->res.seq_res); 7430 7431 switch (task->tk_status) { 7432 case 0: 7433 renew_lease(server, data->timestamp); 7434 break; 7435 case -NFS4ERR_STALE_CLIENTID: 7436 case -NFS4ERR_EXPIRED: 7437 nfs4_schedule_lease_recovery(server->nfs_client); 7438 break; 7439 case -NFS4ERR_LEASE_MOVED: 7440 case -NFS4ERR_DELAY: 7441 if (nfs4_async_handle_error(task, server, 7442 NULL, NULL) == -EAGAIN) 7443 rpc_restart_call_prepare(task); 7444 } 7445 } 7446 7447 static void nfs4_release_lockowner_release(void *calldata) 7448 { 7449 struct nfs_release_lockowner_data *data = calldata; 7450 nfs4_free_lock_state(data->server, data->lsp); 7451 kfree(calldata); 7452 } 7453 7454 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7455 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7456 .rpc_call_done = nfs4_release_lockowner_done, 7457 .rpc_release = nfs4_release_lockowner_release, 7458 }; 7459 7460 static void 7461 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7462 { 7463 struct nfs_release_lockowner_data *data; 7464 struct rpc_message msg = { 7465 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7466 }; 7467 7468 if (server->nfs_client->cl_mvops->minor_version != 0) 7469 return; 7470 7471 data = kmalloc(sizeof(*data), GFP_NOFS); 7472 if (!data) 7473 return; 7474 data->lsp = lsp; 7475 data->server = server; 7476 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7477 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7478 data->args.lock_owner.s_dev = server->s_dev; 7479 7480 msg.rpc_argp = &data->args; 7481 msg.rpc_resp = &data->res; 7482 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7483 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7484 } 7485 7486 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7487 7488 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7489 struct dentry *unused, struct inode *inode, 7490 const char *key, const void *buf, 7491 size_t buflen, int flags) 7492 { 7493 return nfs4_proc_set_acl(inode, buf, buflen); 7494 } 7495 7496 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7497 struct dentry *unused, struct inode *inode, 7498 const char *key, void *buf, size_t buflen) 7499 { 7500 return nfs4_proc_get_acl(inode, buf, buflen); 7501 } 7502 7503 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7504 { 7505 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 7506 } 7507 7508 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7509 7510 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7511 struct dentry *unused, struct inode *inode, 7512 const char *key, const void *buf, 7513 size_t buflen, int flags) 7514 { 7515 if (security_ismaclabel(key)) 7516 return nfs4_set_security_label(inode, buf, buflen); 7517 7518 return -EOPNOTSUPP; 7519 } 7520 7521 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7522 struct dentry *unused, struct inode *inode, 7523 const char *key, void *buf, size_t buflen) 7524 { 7525 if (security_ismaclabel(key)) 7526 return nfs4_get_security_label(inode, buf, buflen); 7527 return -EOPNOTSUPP; 7528 } 7529 7530 static ssize_t 7531 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7532 { 7533 int len = 0; 7534 7535 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7536 len = security_inode_listsecurity(inode, list, list_len); 7537 if (len >= 0 && list_len && len > list_len) 7538 return -ERANGE; 7539 } 7540 return len; 7541 } 7542 7543 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7544 .prefix = XATTR_SECURITY_PREFIX, 7545 .get = nfs4_xattr_get_nfs4_label, 7546 .set = nfs4_xattr_set_nfs4_label, 7547 }; 7548 7549 #else 7550 7551 static ssize_t 7552 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7553 { 7554 return 0; 7555 } 7556 7557 #endif 7558 7559 #ifdef CONFIG_NFS_V4_2 7560 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7561 struct dentry *unused, struct inode *inode, 7562 const char *key, const void *buf, 7563 size_t buflen, int flags) 7564 { 7565 struct nfs_access_entry cache; 7566 int ret; 7567 7568 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7569 return -EOPNOTSUPP; 7570 7571 /* 7572 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7573 * flags right now. Handling of xattr operations use the normal 7574 * file read/write permissions. 7575 * 7576 * Just in case the server has other ideas (which RFC 8276 allows), 7577 * do a cached access check for the XA* flags to possibly avoid 7578 * doing an RPC and getting EACCES back. 7579 */ 7580 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) { 7581 if (!(cache.mask & NFS_ACCESS_XAWRITE)) 7582 return -EACCES; 7583 } 7584 7585 if (buf == NULL) { 7586 ret = nfs42_proc_removexattr(inode, key); 7587 if (!ret) 7588 nfs4_xattr_cache_remove(inode, key); 7589 } else { 7590 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7591 if (!ret) 7592 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7593 } 7594 7595 return ret; 7596 } 7597 7598 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7599 struct dentry *unused, struct inode *inode, 7600 const char *key, void *buf, size_t buflen) 7601 { 7602 struct nfs_access_entry cache; 7603 ssize_t ret; 7604 7605 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7606 return -EOPNOTSUPP; 7607 7608 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) { 7609 if (!(cache.mask & NFS_ACCESS_XAREAD)) 7610 return -EACCES; 7611 } 7612 7613 ret = nfs_revalidate_inode(NFS_SERVER(inode), inode); 7614 if (ret) 7615 return ret; 7616 7617 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7618 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7619 return ret; 7620 7621 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7622 7623 return ret; 7624 } 7625 7626 static ssize_t 7627 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7628 { 7629 u64 cookie; 7630 bool eof; 7631 ssize_t ret, size; 7632 char *buf; 7633 size_t buflen; 7634 struct nfs_access_entry cache; 7635 7636 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7637 return 0; 7638 7639 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) { 7640 if (!(cache.mask & NFS_ACCESS_XALIST)) 7641 return 0; 7642 } 7643 7644 ret = nfs_revalidate_inode(NFS_SERVER(inode), inode); 7645 if (ret) 7646 return ret; 7647 7648 ret = nfs4_xattr_cache_list(inode, list, list_len); 7649 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7650 return ret; 7651 7652 cookie = 0; 7653 eof = false; 7654 buflen = list_len ? list_len : XATTR_LIST_MAX; 7655 buf = list_len ? list : NULL; 7656 size = 0; 7657 7658 while (!eof) { 7659 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7660 &cookie, &eof); 7661 if (ret < 0) 7662 return ret; 7663 7664 if (list_len) { 7665 buf += ret; 7666 buflen -= ret; 7667 } 7668 size += ret; 7669 } 7670 7671 if (list_len) 7672 nfs4_xattr_cache_set_list(inode, list, size); 7673 7674 return size; 7675 } 7676 7677 #else 7678 7679 static ssize_t 7680 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7681 { 7682 return 0; 7683 } 7684 #endif /* CONFIG_NFS_V4_2 */ 7685 7686 /* 7687 * nfs_fhget will use either the mounted_on_fileid or the fileid 7688 */ 7689 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7690 { 7691 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7692 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7693 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7694 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7695 return; 7696 7697 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7698 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7699 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7700 fattr->nlink = 2; 7701 } 7702 7703 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7704 const struct qstr *name, 7705 struct nfs4_fs_locations *fs_locations, 7706 struct page *page) 7707 { 7708 struct nfs_server *server = NFS_SERVER(dir); 7709 u32 bitmask[3]; 7710 struct nfs4_fs_locations_arg args = { 7711 .dir_fh = NFS_FH(dir), 7712 .name = name, 7713 .page = page, 7714 .bitmask = bitmask, 7715 }; 7716 struct nfs4_fs_locations_res res = { 7717 .fs_locations = fs_locations, 7718 }; 7719 struct rpc_message msg = { 7720 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7721 .rpc_argp = &args, 7722 .rpc_resp = &res, 7723 }; 7724 int status; 7725 7726 dprintk("%s: start\n", __func__); 7727 7728 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7729 bitmask[1] = nfs4_fattr_bitmap[1]; 7730 7731 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7732 * is not supported */ 7733 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7734 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7735 else 7736 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7737 7738 nfs_fattr_init(&fs_locations->fattr); 7739 fs_locations->server = server; 7740 fs_locations->nlocations = 0; 7741 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7742 dprintk("%s: returned status = %d\n", __func__, status); 7743 return status; 7744 } 7745 7746 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7747 const struct qstr *name, 7748 struct nfs4_fs_locations *fs_locations, 7749 struct page *page) 7750 { 7751 struct nfs4_exception exception = { 7752 .interruptible = true, 7753 }; 7754 int err; 7755 do { 7756 err = _nfs4_proc_fs_locations(client, dir, name, 7757 fs_locations, page); 7758 trace_nfs4_get_fs_locations(dir, name, err); 7759 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7760 &exception); 7761 } while (exception.retry); 7762 return err; 7763 } 7764 7765 /* 7766 * This operation also signals the server that this client is 7767 * performing migration recovery. The server can stop returning 7768 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 7769 * appended to this compound to identify the client ID which is 7770 * performing recovery. 7771 */ 7772 static int _nfs40_proc_get_locations(struct inode *inode, 7773 struct nfs4_fs_locations *locations, 7774 struct page *page, const struct cred *cred) 7775 { 7776 struct nfs_server *server = NFS_SERVER(inode); 7777 struct rpc_clnt *clnt = server->client; 7778 u32 bitmask[2] = { 7779 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7780 }; 7781 struct nfs4_fs_locations_arg args = { 7782 .clientid = server->nfs_client->cl_clientid, 7783 .fh = NFS_FH(inode), 7784 .page = page, 7785 .bitmask = bitmask, 7786 .migration = 1, /* skip LOOKUP */ 7787 .renew = 1, /* append RENEW */ 7788 }; 7789 struct nfs4_fs_locations_res res = { 7790 .fs_locations = locations, 7791 .migration = 1, 7792 .renew = 1, 7793 }; 7794 struct rpc_message msg = { 7795 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7796 .rpc_argp = &args, 7797 .rpc_resp = &res, 7798 .rpc_cred = cred, 7799 }; 7800 unsigned long now = jiffies; 7801 int status; 7802 7803 nfs_fattr_init(&locations->fattr); 7804 locations->server = server; 7805 locations->nlocations = 0; 7806 7807 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7808 status = nfs4_call_sync_sequence(clnt, server, &msg, 7809 &args.seq_args, &res.seq_res); 7810 if (status) 7811 return status; 7812 7813 renew_lease(server, now); 7814 return 0; 7815 } 7816 7817 #ifdef CONFIG_NFS_V4_1 7818 7819 /* 7820 * This operation also signals the server that this client is 7821 * performing migration recovery. The server can stop asserting 7822 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 7823 * performing this operation is identified in the SEQUENCE 7824 * operation in this compound. 7825 * 7826 * When the client supports GETATTR(fs_locations_info), it can 7827 * be plumbed in here. 7828 */ 7829 static int _nfs41_proc_get_locations(struct inode *inode, 7830 struct nfs4_fs_locations *locations, 7831 struct page *page, const struct cred *cred) 7832 { 7833 struct nfs_server *server = NFS_SERVER(inode); 7834 struct rpc_clnt *clnt = server->client; 7835 u32 bitmask[2] = { 7836 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7837 }; 7838 struct nfs4_fs_locations_arg args = { 7839 .fh = NFS_FH(inode), 7840 .page = page, 7841 .bitmask = bitmask, 7842 .migration = 1, /* skip LOOKUP */ 7843 }; 7844 struct nfs4_fs_locations_res res = { 7845 .fs_locations = locations, 7846 .migration = 1, 7847 }; 7848 struct rpc_message msg = { 7849 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7850 .rpc_argp = &args, 7851 .rpc_resp = &res, 7852 .rpc_cred = cred, 7853 }; 7854 int status; 7855 7856 nfs_fattr_init(&locations->fattr); 7857 locations->server = server; 7858 locations->nlocations = 0; 7859 7860 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7861 status = nfs4_call_sync_sequence(clnt, server, &msg, 7862 &args.seq_args, &res.seq_res); 7863 if (status == NFS4_OK && 7864 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7865 status = -NFS4ERR_LEASE_MOVED; 7866 return status; 7867 } 7868 7869 #endif /* CONFIG_NFS_V4_1 */ 7870 7871 /** 7872 * nfs4_proc_get_locations - discover locations for a migrated FSID 7873 * @inode: inode on FSID that is migrating 7874 * @locations: result of query 7875 * @page: buffer 7876 * @cred: credential to use for this operation 7877 * 7878 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 7879 * operation failed, or a negative errno if a local error occurred. 7880 * 7881 * On success, "locations" is filled in, but if the server has 7882 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 7883 * asserted. 7884 * 7885 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 7886 * from this client that require migration recovery. 7887 */ 7888 int nfs4_proc_get_locations(struct inode *inode, 7889 struct nfs4_fs_locations *locations, 7890 struct page *page, const struct cred *cred) 7891 { 7892 struct nfs_server *server = NFS_SERVER(inode); 7893 struct nfs_client *clp = server->nfs_client; 7894 const struct nfs4_mig_recovery_ops *ops = 7895 clp->cl_mvops->mig_recovery_ops; 7896 struct nfs4_exception exception = { 7897 .interruptible = true, 7898 }; 7899 int status; 7900 7901 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7902 (unsigned long long)server->fsid.major, 7903 (unsigned long long)server->fsid.minor, 7904 clp->cl_hostname); 7905 nfs_display_fhandle(NFS_FH(inode), __func__); 7906 7907 do { 7908 status = ops->get_locations(inode, locations, page, cred); 7909 if (status != -NFS4ERR_DELAY) 7910 break; 7911 nfs4_handle_exception(server, status, &exception); 7912 } while (exception.retry); 7913 return status; 7914 } 7915 7916 /* 7917 * This operation also signals the server that this client is 7918 * performing "lease moved" recovery. The server can stop 7919 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 7920 * is appended to this compound to identify the client ID which is 7921 * performing recovery. 7922 */ 7923 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 7924 { 7925 struct nfs_server *server = NFS_SERVER(inode); 7926 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 7927 struct rpc_clnt *clnt = server->client; 7928 struct nfs4_fsid_present_arg args = { 7929 .fh = NFS_FH(inode), 7930 .clientid = clp->cl_clientid, 7931 .renew = 1, /* append RENEW */ 7932 }; 7933 struct nfs4_fsid_present_res res = { 7934 .renew = 1, 7935 }; 7936 struct rpc_message msg = { 7937 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7938 .rpc_argp = &args, 7939 .rpc_resp = &res, 7940 .rpc_cred = cred, 7941 }; 7942 unsigned long now = jiffies; 7943 int status; 7944 7945 res.fh = nfs_alloc_fhandle(); 7946 if (res.fh == NULL) 7947 return -ENOMEM; 7948 7949 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7950 status = nfs4_call_sync_sequence(clnt, server, &msg, 7951 &args.seq_args, &res.seq_res); 7952 nfs_free_fhandle(res.fh); 7953 if (status) 7954 return status; 7955 7956 do_renew_lease(clp, now); 7957 return 0; 7958 } 7959 7960 #ifdef CONFIG_NFS_V4_1 7961 7962 /* 7963 * This operation also signals the server that this client is 7964 * performing "lease moved" recovery. The server can stop asserting 7965 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 7966 * this operation is identified in the SEQUENCE operation in this 7967 * compound. 7968 */ 7969 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 7970 { 7971 struct nfs_server *server = NFS_SERVER(inode); 7972 struct rpc_clnt *clnt = server->client; 7973 struct nfs4_fsid_present_arg args = { 7974 .fh = NFS_FH(inode), 7975 }; 7976 struct nfs4_fsid_present_res res = { 7977 }; 7978 struct rpc_message msg = { 7979 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7980 .rpc_argp = &args, 7981 .rpc_resp = &res, 7982 .rpc_cred = cred, 7983 }; 7984 int status; 7985 7986 res.fh = nfs_alloc_fhandle(); 7987 if (res.fh == NULL) 7988 return -ENOMEM; 7989 7990 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7991 status = nfs4_call_sync_sequence(clnt, server, &msg, 7992 &args.seq_args, &res.seq_res); 7993 nfs_free_fhandle(res.fh); 7994 if (status == NFS4_OK && 7995 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7996 status = -NFS4ERR_LEASE_MOVED; 7997 return status; 7998 } 7999 8000 #endif /* CONFIG_NFS_V4_1 */ 8001 8002 /** 8003 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8004 * @inode: inode on FSID to check 8005 * @cred: credential to use for this operation 8006 * 8007 * Server indicates whether the FSID is present, moved, or not 8008 * recognized. This operation is necessary to clear a LEASE_MOVED 8009 * condition for this client ID. 8010 * 8011 * Returns NFS4_OK if the FSID is present on this server, 8012 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8013 * NFS4ERR code if some error occurred on the server, or a 8014 * negative errno if a local failure occurred. 8015 */ 8016 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8017 { 8018 struct nfs_server *server = NFS_SERVER(inode); 8019 struct nfs_client *clp = server->nfs_client; 8020 const struct nfs4_mig_recovery_ops *ops = 8021 clp->cl_mvops->mig_recovery_ops; 8022 struct nfs4_exception exception = { 8023 .interruptible = true, 8024 }; 8025 int status; 8026 8027 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8028 (unsigned long long)server->fsid.major, 8029 (unsigned long long)server->fsid.minor, 8030 clp->cl_hostname); 8031 nfs_display_fhandle(NFS_FH(inode), __func__); 8032 8033 do { 8034 status = ops->fsid_present(inode, cred); 8035 if (status != -NFS4ERR_DELAY) 8036 break; 8037 nfs4_handle_exception(server, status, &exception); 8038 } while (exception.retry); 8039 return status; 8040 } 8041 8042 /* 8043 * If 'use_integrity' is true and the state managment nfs_client 8044 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8045 * and the machine credential as per RFC3530bis and RFC5661 Security 8046 * Considerations sections. Otherwise, just use the user cred with the 8047 * filesystem's rpc_client. 8048 */ 8049 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8050 { 8051 int status; 8052 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8053 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8054 struct nfs4_secinfo_arg args = { 8055 .dir_fh = NFS_FH(dir), 8056 .name = name, 8057 }; 8058 struct nfs4_secinfo_res res = { 8059 .flavors = flavors, 8060 }; 8061 struct rpc_message msg = { 8062 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8063 .rpc_argp = &args, 8064 .rpc_resp = &res, 8065 }; 8066 struct nfs4_call_sync_data data = { 8067 .seq_server = NFS_SERVER(dir), 8068 .seq_args = &args.seq_args, 8069 .seq_res = &res.seq_res, 8070 }; 8071 struct rpc_task_setup task_setup = { 8072 .rpc_client = clnt, 8073 .rpc_message = &msg, 8074 .callback_ops = clp->cl_mvops->call_sync_ops, 8075 .callback_data = &data, 8076 .flags = RPC_TASK_NO_ROUND_ROBIN, 8077 }; 8078 const struct cred *cred = NULL; 8079 8080 if (use_integrity) { 8081 clnt = clp->cl_rpcclient; 8082 task_setup.rpc_client = clnt; 8083 8084 cred = nfs4_get_clid_cred(clp); 8085 msg.rpc_cred = cred; 8086 } 8087 8088 dprintk("NFS call secinfo %s\n", name->name); 8089 8090 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8091 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8092 status = nfs4_call_sync_custom(&task_setup); 8093 8094 dprintk("NFS reply secinfo: %d\n", status); 8095 8096 put_cred(cred); 8097 return status; 8098 } 8099 8100 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8101 struct nfs4_secinfo_flavors *flavors) 8102 { 8103 struct nfs4_exception exception = { 8104 .interruptible = true, 8105 }; 8106 int err; 8107 do { 8108 err = -NFS4ERR_WRONGSEC; 8109 8110 /* try to use integrity protection with machine cred */ 8111 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8112 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8113 8114 /* 8115 * if unable to use integrity protection, or SECINFO with 8116 * integrity protection returns NFS4ERR_WRONGSEC (which is 8117 * disallowed by spec, but exists in deployed servers) use 8118 * the current filesystem's rpc_client and the user cred. 8119 */ 8120 if (err == -NFS4ERR_WRONGSEC) 8121 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8122 8123 trace_nfs4_secinfo(dir, name, err); 8124 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8125 &exception); 8126 } while (exception.retry); 8127 return err; 8128 } 8129 8130 #ifdef CONFIG_NFS_V4_1 8131 /* 8132 * Check the exchange flags returned by the server for invalid flags, having 8133 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8134 * DS flags set. 8135 */ 8136 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8137 { 8138 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8139 goto out_inval; 8140 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8141 goto out_inval; 8142 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8143 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8144 goto out_inval; 8145 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8146 goto out_inval; 8147 return NFS_OK; 8148 out_inval: 8149 return -NFS4ERR_INVAL; 8150 } 8151 8152 static bool 8153 nfs41_same_server_scope(struct nfs41_server_scope *a, 8154 struct nfs41_server_scope *b) 8155 { 8156 if (a->server_scope_sz != b->server_scope_sz) 8157 return false; 8158 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8159 } 8160 8161 static void 8162 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8163 { 8164 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8165 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8166 struct nfs_client *clp = args->client; 8167 8168 switch (task->tk_status) { 8169 case -NFS4ERR_BADSESSION: 8170 case -NFS4ERR_DEADSESSION: 8171 nfs4_schedule_session_recovery(clp->cl_session, 8172 task->tk_status); 8173 } 8174 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8175 res->dir != NFS4_CDFS4_BOTH) { 8176 rpc_task_close_connection(task); 8177 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8178 rpc_restart_call(task); 8179 } 8180 } 8181 8182 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8183 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8184 }; 8185 8186 /* 8187 * nfs4_proc_bind_one_conn_to_session() 8188 * 8189 * The 4.1 client currently uses the same TCP connection for the 8190 * fore and backchannel. 8191 */ 8192 static 8193 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8194 struct rpc_xprt *xprt, 8195 struct nfs_client *clp, 8196 const struct cred *cred) 8197 { 8198 int status; 8199 struct nfs41_bind_conn_to_session_args args = { 8200 .client = clp, 8201 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8202 .retries = 0, 8203 }; 8204 struct nfs41_bind_conn_to_session_res res; 8205 struct rpc_message msg = { 8206 .rpc_proc = 8207 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8208 .rpc_argp = &args, 8209 .rpc_resp = &res, 8210 .rpc_cred = cred, 8211 }; 8212 struct rpc_task_setup task_setup_data = { 8213 .rpc_client = clnt, 8214 .rpc_xprt = xprt, 8215 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8216 .rpc_message = &msg, 8217 .flags = RPC_TASK_TIMEOUT, 8218 }; 8219 struct rpc_task *task; 8220 8221 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8222 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8223 args.dir = NFS4_CDFC4_FORE; 8224 8225 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8226 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8227 args.dir = NFS4_CDFC4_FORE; 8228 8229 task = rpc_run_task(&task_setup_data); 8230 if (!IS_ERR(task)) { 8231 status = task->tk_status; 8232 rpc_put_task(task); 8233 } else 8234 status = PTR_ERR(task); 8235 trace_nfs4_bind_conn_to_session(clp, status); 8236 if (status == 0) { 8237 if (memcmp(res.sessionid.data, 8238 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8239 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8240 return -EIO; 8241 } 8242 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8243 dprintk("NFS: %s: Unexpected direction from server\n", 8244 __func__); 8245 return -EIO; 8246 } 8247 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8248 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8249 __func__); 8250 return -EIO; 8251 } 8252 } 8253 8254 return status; 8255 } 8256 8257 struct rpc_bind_conn_calldata { 8258 struct nfs_client *clp; 8259 const struct cred *cred; 8260 }; 8261 8262 static int 8263 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8264 struct rpc_xprt *xprt, 8265 void *calldata) 8266 { 8267 struct rpc_bind_conn_calldata *p = calldata; 8268 8269 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8270 } 8271 8272 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8273 { 8274 struct rpc_bind_conn_calldata data = { 8275 .clp = clp, 8276 .cred = cred, 8277 }; 8278 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8279 nfs4_proc_bind_conn_to_session_callback, &data); 8280 } 8281 8282 /* 8283 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8284 * and operations we'd like to see to enable certain features in the allow map 8285 */ 8286 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8287 .how = SP4_MACH_CRED, 8288 .enforce.u.words = { 8289 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8290 1 << (OP_EXCHANGE_ID - 32) | 8291 1 << (OP_CREATE_SESSION - 32) | 8292 1 << (OP_DESTROY_SESSION - 32) | 8293 1 << (OP_DESTROY_CLIENTID - 32) 8294 }, 8295 .allow.u.words = { 8296 [0] = 1 << (OP_CLOSE) | 8297 1 << (OP_OPEN_DOWNGRADE) | 8298 1 << (OP_LOCKU) | 8299 1 << (OP_DELEGRETURN) | 8300 1 << (OP_COMMIT), 8301 [1] = 1 << (OP_SECINFO - 32) | 8302 1 << (OP_SECINFO_NO_NAME - 32) | 8303 1 << (OP_LAYOUTRETURN - 32) | 8304 1 << (OP_TEST_STATEID - 32) | 8305 1 << (OP_FREE_STATEID - 32) | 8306 1 << (OP_WRITE - 32) 8307 } 8308 }; 8309 8310 /* 8311 * Select the state protection mode for client `clp' given the server results 8312 * from exchange_id in `sp'. 8313 * 8314 * Returns 0 on success, negative errno otherwise. 8315 */ 8316 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8317 struct nfs41_state_protection *sp) 8318 { 8319 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8320 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8321 1 << (OP_EXCHANGE_ID - 32) | 8322 1 << (OP_CREATE_SESSION - 32) | 8323 1 << (OP_DESTROY_SESSION - 32) | 8324 1 << (OP_DESTROY_CLIENTID - 32) 8325 }; 8326 unsigned long flags = 0; 8327 unsigned int i; 8328 int ret = 0; 8329 8330 if (sp->how == SP4_MACH_CRED) { 8331 /* Print state protect result */ 8332 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8333 for (i = 0; i <= LAST_NFS4_OP; i++) { 8334 if (test_bit(i, sp->enforce.u.longs)) 8335 dfprintk(MOUNT, " enforce op %d\n", i); 8336 if (test_bit(i, sp->allow.u.longs)) 8337 dfprintk(MOUNT, " allow op %d\n", i); 8338 } 8339 8340 /* make sure nothing is on enforce list that isn't supported */ 8341 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8342 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8343 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8344 ret = -EINVAL; 8345 goto out; 8346 } 8347 } 8348 8349 /* 8350 * Minimal mode - state operations are allowed to use machine 8351 * credential. Note this already happens by default, so the 8352 * client doesn't have to do anything more than the negotiation. 8353 * 8354 * NOTE: we don't care if EXCHANGE_ID is in the list - 8355 * we're already using the machine cred for exchange_id 8356 * and will never use a different cred. 8357 */ 8358 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8359 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8360 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8361 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8362 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8363 dfprintk(MOUNT, " minimal mode enabled\n"); 8364 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8365 } else { 8366 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8367 ret = -EINVAL; 8368 goto out; 8369 } 8370 8371 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8372 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8373 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8374 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8375 dfprintk(MOUNT, " cleanup mode enabled\n"); 8376 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8377 } 8378 8379 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8380 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8381 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8382 } 8383 8384 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8385 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8386 dfprintk(MOUNT, " secinfo mode enabled\n"); 8387 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8388 } 8389 8390 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8391 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8392 dfprintk(MOUNT, " stateid mode enabled\n"); 8393 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8394 } 8395 8396 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8397 dfprintk(MOUNT, " write mode enabled\n"); 8398 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8399 } 8400 8401 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8402 dfprintk(MOUNT, " commit mode enabled\n"); 8403 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8404 } 8405 } 8406 out: 8407 clp->cl_sp4_flags = flags; 8408 return ret; 8409 } 8410 8411 struct nfs41_exchange_id_data { 8412 struct nfs41_exchange_id_res res; 8413 struct nfs41_exchange_id_args args; 8414 }; 8415 8416 static void nfs4_exchange_id_release(void *data) 8417 { 8418 struct nfs41_exchange_id_data *cdata = 8419 (struct nfs41_exchange_id_data *)data; 8420 8421 nfs_put_client(cdata->args.client); 8422 kfree(cdata->res.impl_id); 8423 kfree(cdata->res.server_scope); 8424 kfree(cdata->res.server_owner); 8425 kfree(cdata); 8426 } 8427 8428 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8429 .rpc_release = nfs4_exchange_id_release, 8430 }; 8431 8432 /* 8433 * _nfs4_proc_exchange_id() 8434 * 8435 * Wrapper for EXCHANGE_ID operation. 8436 */ 8437 static struct rpc_task * 8438 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8439 u32 sp4_how, struct rpc_xprt *xprt) 8440 { 8441 struct rpc_message msg = { 8442 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8443 .rpc_cred = cred, 8444 }; 8445 struct rpc_task_setup task_setup_data = { 8446 .rpc_client = clp->cl_rpcclient, 8447 .callback_ops = &nfs4_exchange_id_call_ops, 8448 .rpc_message = &msg, 8449 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8450 }; 8451 struct nfs41_exchange_id_data *calldata; 8452 int status; 8453 8454 if (!refcount_inc_not_zero(&clp->cl_count)) 8455 return ERR_PTR(-EIO); 8456 8457 status = -ENOMEM; 8458 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8459 if (!calldata) 8460 goto out; 8461 8462 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8463 8464 status = nfs4_init_uniform_client_string(clp); 8465 if (status) 8466 goto out_calldata; 8467 8468 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8469 GFP_NOFS); 8470 status = -ENOMEM; 8471 if (unlikely(calldata->res.server_owner == NULL)) 8472 goto out_calldata; 8473 8474 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8475 GFP_NOFS); 8476 if (unlikely(calldata->res.server_scope == NULL)) 8477 goto out_server_owner; 8478 8479 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8480 if (unlikely(calldata->res.impl_id == NULL)) 8481 goto out_server_scope; 8482 8483 switch (sp4_how) { 8484 case SP4_NONE: 8485 calldata->args.state_protect.how = SP4_NONE; 8486 break; 8487 8488 case SP4_MACH_CRED: 8489 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8490 break; 8491 8492 default: 8493 /* unsupported! */ 8494 WARN_ON_ONCE(1); 8495 status = -EINVAL; 8496 goto out_impl_id; 8497 } 8498 if (xprt) { 8499 task_setup_data.rpc_xprt = xprt; 8500 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8501 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8502 sizeof(calldata->args.verifier.data)); 8503 } 8504 calldata->args.client = clp; 8505 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8506 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8507 #ifdef CONFIG_NFS_V4_1_MIGRATION 8508 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8509 #endif 8510 msg.rpc_argp = &calldata->args; 8511 msg.rpc_resp = &calldata->res; 8512 task_setup_data.callback_data = calldata; 8513 8514 return rpc_run_task(&task_setup_data); 8515 8516 out_impl_id: 8517 kfree(calldata->res.impl_id); 8518 out_server_scope: 8519 kfree(calldata->res.server_scope); 8520 out_server_owner: 8521 kfree(calldata->res.server_owner); 8522 out_calldata: 8523 kfree(calldata); 8524 out: 8525 nfs_put_client(clp); 8526 return ERR_PTR(status); 8527 } 8528 8529 /* 8530 * _nfs4_proc_exchange_id() 8531 * 8532 * Wrapper for EXCHANGE_ID operation. 8533 */ 8534 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8535 u32 sp4_how) 8536 { 8537 struct rpc_task *task; 8538 struct nfs41_exchange_id_args *argp; 8539 struct nfs41_exchange_id_res *resp; 8540 unsigned long now = jiffies; 8541 int status; 8542 8543 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8544 if (IS_ERR(task)) 8545 return PTR_ERR(task); 8546 8547 argp = task->tk_msg.rpc_argp; 8548 resp = task->tk_msg.rpc_resp; 8549 status = task->tk_status; 8550 if (status != 0) 8551 goto out; 8552 8553 status = nfs4_check_cl_exchange_flags(resp->flags, 8554 clp->cl_mvops->minor_version); 8555 if (status != 0) 8556 goto out; 8557 8558 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8559 if (status != 0) 8560 goto out; 8561 8562 do_renew_lease(clp, now); 8563 8564 clp->cl_clientid = resp->clientid; 8565 clp->cl_exchange_flags = resp->flags; 8566 clp->cl_seqid = resp->seqid; 8567 /* Client ID is not confirmed */ 8568 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8569 clear_bit(NFS4_SESSION_ESTABLISHED, 8570 &clp->cl_session->session_state); 8571 8572 if (clp->cl_serverscope != NULL && 8573 !nfs41_same_server_scope(clp->cl_serverscope, 8574 resp->server_scope)) { 8575 dprintk("%s: server_scope mismatch detected\n", 8576 __func__); 8577 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8578 } 8579 8580 swap(clp->cl_serverowner, resp->server_owner); 8581 swap(clp->cl_serverscope, resp->server_scope); 8582 swap(clp->cl_implid, resp->impl_id); 8583 8584 /* Save the EXCHANGE_ID verifier session trunk tests */ 8585 memcpy(clp->cl_confirm.data, argp->verifier.data, 8586 sizeof(clp->cl_confirm.data)); 8587 out: 8588 trace_nfs4_exchange_id(clp, status); 8589 rpc_put_task(task); 8590 return status; 8591 } 8592 8593 /* 8594 * nfs4_proc_exchange_id() 8595 * 8596 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8597 * 8598 * Since the clientid has expired, all compounds using sessions 8599 * associated with the stale clientid will be returning 8600 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8601 * be in some phase of session reset. 8602 * 8603 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8604 */ 8605 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8606 { 8607 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8608 int status; 8609 8610 /* try SP4_MACH_CRED if krb5i/p */ 8611 if (authflavor == RPC_AUTH_GSS_KRB5I || 8612 authflavor == RPC_AUTH_GSS_KRB5P) { 8613 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8614 if (!status) 8615 return 0; 8616 } 8617 8618 /* try SP4_NONE */ 8619 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8620 } 8621 8622 /** 8623 * nfs4_test_session_trunk 8624 * 8625 * This is an add_xprt_test() test function called from 8626 * rpc_clnt_setup_test_and_add_xprt. 8627 * 8628 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8629 * and is dereferrenced in nfs4_exchange_id_release 8630 * 8631 * Upon success, add the new transport to the rpc_clnt 8632 * 8633 * @clnt: struct rpc_clnt to get new transport 8634 * @xprt: the rpc_xprt to test 8635 * @data: call data for _nfs4_proc_exchange_id. 8636 */ 8637 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8638 void *data) 8639 { 8640 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 8641 struct rpc_task *task; 8642 int status; 8643 8644 u32 sp4_how; 8645 8646 dprintk("--> %s try %s\n", __func__, 8647 xprt->address_strings[RPC_DISPLAY_ADDR]); 8648 8649 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8650 8651 /* Test connection for session trunking. Async exchange_id call */ 8652 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8653 if (IS_ERR(task)) 8654 return; 8655 8656 status = task->tk_status; 8657 if (status == 0) 8658 status = nfs4_detect_session_trunking(adata->clp, 8659 task->tk_msg.rpc_resp, xprt); 8660 8661 if (status == 0) 8662 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8663 8664 rpc_put_task(task); 8665 } 8666 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8667 8668 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8669 const struct cred *cred) 8670 { 8671 struct rpc_message msg = { 8672 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8673 .rpc_argp = clp, 8674 .rpc_cred = cred, 8675 }; 8676 int status; 8677 8678 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8679 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8680 trace_nfs4_destroy_clientid(clp, status); 8681 if (status) 8682 dprintk("NFS: Got error %d from the server %s on " 8683 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8684 return status; 8685 } 8686 8687 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8688 const struct cred *cred) 8689 { 8690 unsigned int loop; 8691 int ret; 8692 8693 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8694 ret = _nfs4_proc_destroy_clientid(clp, cred); 8695 switch (ret) { 8696 case -NFS4ERR_DELAY: 8697 case -NFS4ERR_CLIENTID_BUSY: 8698 ssleep(1); 8699 break; 8700 default: 8701 return ret; 8702 } 8703 } 8704 return 0; 8705 } 8706 8707 int nfs4_destroy_clientid(struct nfs_client *clp) 8708 { 8709 const struct cred *cred; 8710 int ret = 0; 8711 8712 if (clp->cl_mvops->minor_version < 1) 8713 goto out; 8714 if (clp->cl_exchange_flags == 0) 8715 goto out; 8716 if (clp->cl_preserve_clid) 8717 goto out; 8718 cred = nfs4_get_clid_cred(clp); 8719 ret = nfs4_proc_destroy_clientid(clp, cred); 8720 put_cred(cred); 8721 switch (ret) { 8722 case 0: 8723 case -NFS4ERR_STALE_CLIENTID: 8724 clp->cl_exchange_flags = 0; 8725 } 8726 out: 8727 return ret; 8728 } 8729 8730 #endif /* CONFIG_NFS_V4_1 */ 8731 8732 struct nfs4_get_lease_time_data { 8733 struct nfs4_get_lease_time_args *args; 8734 struct nfs4_get_lease_time_res *res; 8735 struct nfs_client *clp; 8736 }; 8737 8738 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 8739 void *calldata) 8740 { 8741 struct nfs4_get_lease_time_data *data = 8742 (struct nfs4_get_lease_time_data *)calldata; 8743 8744 dprintk("--> %s\n", __func__); 8745 /* just setup sequence, do not trigger session recovery 8746 since we're invoked within one */ 8747 nfs4_setup_sequence(data->clp, 8748 &data->args->la_seq_args, 8749 &data->res->lr_seq_res, 8750 task); 8751 dprintk("<-- %s\n", __func__); 8752 } 8753 8754 /* 8755 * Called from nfs4_state_manager thread for session setup, so don't recover 8756 * from sequence operation or clientid errors. 8757 */ 8758 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 8759 { 8760 struct nfs4_get_lease_time_data *data = 8761 (struct nfs4_get_lease_time_data *)calldata; 8762 8763 dprintk("--> %s\n", __func__); 8764 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 8765 return; 8766 switch (task->tk_status) { 8767 case -NFS4ERR_DELAY: 8768 case -NFS4ERR_GRACE: 8769 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 8770 rpc_delay(task, NFS4_POLL_RETRY_MIN); 8771 task->tk_status = 0; 8772 fallthrough; 8773 case -NFS4ERR_RETRY_UNCACHED_REP: 8774 rpc_restart_call_prepare(task); 8775 return; 8776 } 8777 dprintk("<-- %s\n", __func__); 8778 } 8779 8780 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 8781 .rpc_call_prepare = nfs4_get_lease_time_prepare, 8782 .rpc_call_done = nfs4_get_lease_time_done, 8783 }; 8784 8785 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 8786 { 8787 struct nfs4_get_lease_time_args args; 8788 struct nfs4_get_lease_time_res res = { 8789 .lr_fsinfo = fsinfo, 8790 }; 8791 struct nfs4_get_lease_time_data data = { 8792 .args = &args, 8793 .res = &res, 8794 .clp = clp, 8795 }; 8796 struct rpc_message msg = { 8797 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 8798 .rpc_argp = &args, 8799 .rpc_resp = &res, 8800 }; 8801 struct rpc_task_setup task_setup = { 8802 .rpc_client = clp->cl_rpcclient, 8803 .rpc_message = &msg, 8804 .callback_ops = &nfs4_get_lease_time_ops, 8805 .callback_data = &data, 8806 .flags = RPC_TASK_TIMEOUT, 8807 }; 8808 8809 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 8810 return nfs4_call_sync_custom(&task_setup); 8811 } 8812 8813 #ifdef CONFIG_NFS_V4_1 8814 8815 /* 8816 * Initialize the values to be used by the client in CREATE_SESSION 8817 * If nfs4_init_session set the fore channel request and response sizes, 8818 * use them. 8819 * 8820 * Set the back channel max_resp_sz_cached to zero to force the client to 8821 * always set csa_cachethis to FALSE because the current implementation 8822 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 8823 */ 8824 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 8825 struct rpc_clnt *clnt) 8826 { 8827 unsigned int max_rqst_sz, max_resp_sz; 8828 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 8829 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 8830 8831 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 8832 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 8833 8834 /* Fore channel attributes */ 8835 args->fc_attrs.max_rqst_sz = max_rqst_sz; 8836 args->fc_attrs.max_resp_sz = max_resp_sz; 8837 args->fc_attrs.max_ops = NFS4_MAX_OPS; 8838 args->fc_attrs.max_reqs = max_session_slots; 8839 8840 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 8841 "max_ops=%u max_reqs=%u\n", 8842 __func__, 8843 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 8844 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 8845 8846 /* Back channel attributes */ 8847 args->bc_attrs.max_rqst_sz = max_bc_payload; 8848 args->bc_attrs.max_resp_sz = max_bc_payload; 8849 args->bc_attrs.max_resp_sz_cached = 0; 8850 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 8851 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 8852 if (args->bc_attrs.max_reqs > max_bc_slots) 8853 args->bc_attrs.max_reqs = max_bc_slots; 8854 8855 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 8856 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 8857 __func__, 8858 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 8859 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 8860 args->bc_attrs.max_reqs); 8861 } 8862 8863 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 8864 struct nfs41_create_session_res *res) 8865 { 8866 struct nfs4_channel_attrs *sent = &args->fc_attrs; 8867 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 8868 8869 if (rcvd->max_resp_sz > sent->max_resp_sz) 8870 return -EINVAL; 8871 /* 8872 * Our requested max_ops is the minimum we need; we're not 8873 * prepared to break up compounds into smaller pieces than that. 8874 * So, no point even trying to continue if the server won't 8875 * cooperate: 8876 */ 8877 if (rcvd->max_ops < sent->max_ops) 8878 return -EINVAL; 8879 if (rcvd->max_reqs == 0) 8880 return -EINVAL; 8881 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 8882 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 8883 return 0; 8884 } 8885 8886 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 8887 struct nfs41_create_session_res *res) 8888 { 8889 struct nfs4_channel_attrs *sent = &args->bc_attrs; 8890 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 8891 8892 if (!(res->flags & SESSION4_BACK_CHAN)) 8893 goto out; 8894 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 8895 return -EINVAL; 8896 if (rcvd->max_resp_sz < sent->max_resp_sz) 8897 return -EINVAL; 8898 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 8899 return -EINVAL; 8900 if (rcvd->max_ops > sent->max_ops) 8901 return -EINVAL; 8902 if (rcvd->max_reqs > sent->max_reqs) 8903 return -EINVAL; 8904 out: 8905 return 0; 8906 } 8907 8908 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 8909 struct nfs41_create_session_res *res) 8910 { 8911 int ret; 8912 8913 ret = nfs4_verify_fore_channel_attrs(args, res); 8914 if (ret) 8915 return ret; 8916 return nfs4_verify_back_channel_attrs(args, res); 8917 } 8918 8919 static void nfs4_update_session(struct nfs4_session *session, 8920 struct nfs41_create_session_res *res) 8921 { 8922 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 8923 /* Mark client id and session as being confirmed */ 8924 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 8925 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 8926 session->flags = res->flags; 8927 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 8928 if (res->flags & SESSION4_BACK_CHAN) 8929 memcpy(&session->bc_attrs, &res->bc_attrs, 8930 sizeof(session->bc_attrs)); 8931 } 8932 8933 static int _nfs4_proc_create_session(struct nfs_client *clp, 8934 const struct cred *cred) 8935 { 8936 struct nfs4_session *session = clp->cl_session; 8937 struct nfs41_create_session_args args = { 8938 .client = clp, 8939 .clientid = clp->cl_clientid, 8940 .seqid = clp->cl_seqid, 8941 .cb_program = NFS4_CALLBACK, 8942 }; 8943 struct nfs41_create_session_res res; 8944 8945 struct rpc_message msg = { 8946 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 8947 .rpc_argp = &args, 8948 .rpc_resp = &res, 8949 .rpc_cred = cred, 8950 }; 8951 int status; 8952 8953 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 8954 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 8955 8956 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 8957 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8958 trace_nfs4_create_session(clp, status); 8959 8960 switch (status) { 8961 case -NFS4ERR_STALE_CLIENTID: 8962 case -NFS4ERR_DELAY: 8963 case -ETIMEDOUT: 8964 case -EACCES: 8965 case -EAGAIN: 8966 goto out; 8967 } 8968 8969 clp->cl_seqid++; 8970 if (!status) { 8971 /* Verify the session's negotiated channel_attrs values */ 8972 status = nfs4_verify_channel_attrs(&args, &res); 8973 /* Increment the clientid slot sequence id */ 8974 if (status) 8975 goto out; 8976 nfs4_update_session(session, &res); 8977 } 8978 out: 8979 return status; 8980 } 8981 8982 /* 8983 * Issues a CREATE_SESSION operation to the server. 8984 * It is the responsibility of the caller to verify the session is 8985 * expired before calling this routine. 8986 */ 8987 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 8988 { 8989 int status; 8990 unsigned *ptr; 8991 struct nfs4_session *session = clp->cl_session; 8992 8993 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 8994 8995 status = _nfs4_proc_create_session(clp, cred); 8996 if (status) 8997 goto out; 8998 8999 /* Init or reset the session slot tables */ 9000 status = nfs4_setup_session_slot_tables(session); 9001 dprintk("slot table setup returned %d\n", status); 9002 if (status) 9003 goto out; 9004 9005 ptr = (unsigned *)&session->sess_id.data[0]; 9006 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9007 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9008 out: 9009 dprintk("<-- %s\n", __func__); 9010 return status; 9011 } 9012 9013 /* 9014 * Issue the over-the-wire RPC DESTROY_SESSION. 9015 * The caller must serialize access to this routine. 9016 */ 9017 int nfs4_proc_destroy_session(struct nfs4_session *session, 9018 const struct cred *cred) 9019 { 9020 struct rpc_message msg = { 9021 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9022 .rpc_argp = session, 9023 .rpc_cred = cred, 9024 }; 9025 int status = 0; 9026 9027 dprintk("--> nfs4_proc_destroy_session\n"); 9028 9029 /* session is still being setup */ 9030 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9031 return 0; 9032 9033 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9034 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9035 trace_nfs4_destroy_session(session->clp, status); 9036 9037 if (status) 9038 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9039 "Session has been destroyed regardless...\n", status); 9040 9041 dprintk("<-- nfs4_proc_destroy_session\n"); 9042 return status; 9043 } 9044 9045 /* 9046 * Renew the cl_session lease. 9047 */ 9048 struct nfs4_sequence_data { 9049 struct nfs_client *clp; 9050 struct nfs4_sequence_args args; 9051 struct nfs4_sequence_res res; 9052 }; 9053 9054 static void nfs41_sequence_release(void *data) 9055 { 9056 struct nfs4_sequence_data *calldata = data; 9057 struct nfs_client *clp = calldata->clp; 9058 9059 if (refcount_read(&clp->cl_count) > 1) 9060 nfs4_schedule_state_renewal(clp); 9061 nfs_put_client(clp); 9062 kfree(calldata); 9063 } 9064 9065 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9066 { 9067 switch(task->tk_status) { 9068 case -NFS4ERR_DELAY: 9069 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9070 return -EAGAIN; 9071 default: 9072 nfs4_schedule_lease_recovery(clp); 9073 } 9074 return 0; 9075 } 9076 9077 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9078 { 9079 struct nfs4_sequence_data *calldata = data; 9080 struct nfs_client *clp = calldata->clp; 9081 9082 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9083 return; 9084 9085 trace_nfs4_sequence(clp, task->tk_status); 9086 if (task->tk_status < 0) { 9087 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9088 if (refcount_read(&clp->cl_count) == 1) 9089 goto out; 9090 9091 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9092 rpc_restart_call_prepare(task); 9093 return; 9094 } 9095 } 9096 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9097 out: 9098 dprintk("<-- %s\n", __func__); 9099 } 9100 9101 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9102 { 9103 struct nfs4_sequence_data *calldata = data; 9104 struct nfs_client *clp = calldata->clp; 9105 struct nfs4_sequence_args *args; 9106 struct nfs4_sequence_res *res; 9107 9108 args = task->tk_msg.rpc_argp; 9109 res = task->tk_msg.rpc_resp; 9110 9111 nfs4_setup_sequence(clp, args, res, task); 9112 } 9113 9114 static const struct rpc_call_ops nfs41_sequence_ops = { 9115 .rpc_call_done = nfs41_sequence_call_done, 9116 .rpc_call_prepare = nfs41_sequence_prepare, 9117 .rpc_release = nfs41_sequence_release, 9118 }; 9119 9120 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9121 const struct cred *cred, 9122 struct nfs4_slot *slot, 9123 bool is_privileged) 9124 { 9125 struct nfs4_sequence_data *calldata; 9126 struct rpc_message msg = { 9127 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9128 .rpc_cred = cred, 9129 }; 9130 struct rpc_task_setup task_setup_data = { 9131 .rpc_client = clp->cl_rpcclient, 9132 .rpc_message = &msg, 9133 .callback_ops = &nfs41_sequence_ops, 9134 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 9135 }; 9136 struct rpc_task *ret; 9137 9138 ret = ERR_PTR(-EIO); 9139 if (!refcount_inc_not_zero(&clp->cl_count)) 9140 goto out_err; 9141 9142 ret = ERR_PTR(-ENOMEM); 9143 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9144 if (calldata == NULL) 9145 goto out_put_clp; 9146 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9147 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9148 msg.rpc_argp = &calldata->args; 9149 msg.rpc_resp = &calldata->res; 9150 calldata->clp = clp; 9151 task_setup_data.callback_data = calldata; 9152 9153 ret = rpc_run_task(&task_setup_data); 9154 if (IS_ERR(ret)) 9155 goto out_err; 9156 return ret; 9157 out_put_clp: 9158 nfs_put_client(clp); 9159 out_err: 9160 nfs41_release_slot(slot); 9161 return ret; 9162 } 9163 9164 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9165 { 9166 struct rpc_task *task; 9167 int ret = 0; 9168 9169 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9170 return -EAGAIN; 9171 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9172 if (IS_ERR(task)) 9173 ret = PTR_ERR(task); 9174 else 9175 rpc_put_task_async(task); 9176 dprintk("<-- %s status=%d\n", __func__, ret); 9177 return ret; 9178 } 9179 9180 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9181 { 9182 struct rpc_task *task; 9183 int ret; 9184 9185 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9186 if (IS_ERR(task)) { 9187 ret = PTR_ERR(task); 9188 goto out; 9189 } 9190 ret = rpc_wait_for_completion_task(task); 9191 if (!ret) 9192 ret = task->tk_status; 9193 rpc_put_task(task); 9194 out: 9195 dprintk("<-- %s status=%d\n", __func__, ret); 9196 return ret; 9197 } 9198 9199 struct nfs4_reclaim_complete_data { 9200 struct nfs_client *clp; 9201 struct nfs41_reclaim_complete_args arg; 9202 struct nfs41_reclaim_complete_res res; 9203 }; 9204 9205 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9206 { 9207 struct nfs4_reclaim_complete_data *calldata = data; 9208 9209 nfs4_setup_sequence(calldata->clp, 9210 &calldata->arg.seq_args, 9211 &calldata->res.seq_res, 9212 task); 9213 } 9214 9215 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9216 { 9217 switch(task->tk_status) { 9218 case 0: 9219 wake_up_all(&clp->cl_lock_waitq); 9220 fallthrough; 9221 case -NFS4ERR_COMPLETE_ALREADY: 9222 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9223 break; 9224 case -NFS4ERR_DELAY: 9225 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9226 fallthrough; 9227 case -NFS4ERR_RETRY_UNCACHED_REP: 9228 return -EAGAIN; 9229 case -NFS4ERR_BADSESSION: 9230 case -NFS4ERR_DEADSESSION: 9231 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9232 break; 9233 default: 9234 nfs4_schedule_lease_recovery(clp); 9235 } 9236 return 0; 9237 } 9238 9239 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9240 { 9241 struct nfs4_reclaim_complete_data *calldata = data; 9242 struct nfs_client *clp = calldata->clp; 9243 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9244 9245 dprintk("--> %s\n", __func__); 9246 if (!nfs41_sequence_done(task, res)) 9247 return; 9248 9249 trace_nfs4_reclaim_complete(clp, task->tk_status); 9250 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9251 rpc_restart_call_prepare(task); 9252 return; 9253 } 9254 dprintk("<-- %s\n", __func__); 9255 } 9256 9257 static void nfs4_free_reclaim_complete_data(void *data) 9258 { 9259 struct nfs4_reclaim_complete_data *calldata = data; 9260 9261 kfree(calldata); 9262 } 9263 9264 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9265 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9266 .rpc_call_done = nfs4_reclaim_complete_done, 9267 .rpc_release = nfs4_free_reclaim_complete_data, 9268 }; 9269 9270 /* 9271 * Issue a global reclaim complete. 9272 */ 9273 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9274 const struct cred *cred) 9275 { 9276 struct nfs4_reclaim_complete_data *calldata; 9277 struct rpc_message msg = { 9278 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9279 .rpc_cred = cred, 9280 }; 9281 struct rpc_task_setup task_setup_data = { 9282 .rpc_client = clp->cl_rpcclient, 9283 .rpc_message = &msg, 9284 .callback_ops = &nfs4_reclaim_complete_call_ops, 9285 .flags = RPC_TASK_NO_ROUND_ROBIN, 9286 }; 9287 int status = -ENOMEM; 9288 9289 dprintk("--> %s\n", __func__); 9290 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9291 if (calldata == NULL) 9292 goto out; 9293 calldata->clp = clp; 9294 calldata->arg.one_fs = 0; 9295 9296 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9297 msg.rpc_argp = &calldata->arg; 9298 msg.rpc_resp = &calldata->res; 9299 task_setup_data.callback_data = calldata; 9300 status = nfs4_call_sync_custom(&task_setup_data); 9301 out: 9302 dprintk("<-- %s status=%d\n", __func__, status); 9303 return status; 9304 } 9305 9306 static void 9307 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9308 { 9309 struct nfs4_layoutget *lgp = calldata; 9310 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9311 9312 dprintk("--> %s\n", __func__); 9313 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9314 &lgp->res.seq_res, task); 9315 dprintk("<-- %s\n", __func__); 9316 } 9317 9318 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9319 { 9320 struct nfs4_layoutget *lgp = calldata; 9321 9322 dprintk("--> %s\n", __func__); 9323 nfs41_sequence_process(task, &lgp->res.seq_res); 9324 dprintk("<-- %s\n", __func__); 9325 } 9326 9327 static int 9328 nfs4_layoutget_handle_exception(struct rpc_task *task, 9329 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9330 { 9331 struct inode *inode = lgp->args.inode; 9332 struct nfs_server *server = NFS_SERVER(inode); 9333 struct pnfs_layout_hdr *lo; 9334 int nfs4err = task->tk_status; 9335 int err, status = 0; 9336 LIST_HEAD(head); 9337 9338 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9339 9340 nfs4_sequence_free_slot(&lgp->res.seq_res); 9341 9342 switch (nfs4err) { 9343 case 0: 9344 goto out; 9345 9346 /* 9347 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9348 * on the file. set tk_status to -ENODATA to tell upper layer to 9349 * retry go inband. 9350 */ 9351 case -NFS4ERR_LAYOUTUNAVAILABLE: 9352 status = -ENODATA; 9353 goto out; 9354 /* 9355 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9356 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9357 */ 9358 case -NFS4ERR_BADLAYOUT: 9359 status = -EOVERFLOW; 9360 goto out; 9361 /* 9362 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9363 * (or clients) writing to the same RAID stripe except when 9364 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9365 * 9366 * Treat it like we would RECALLCONFLICT -- we retry for a little 9367 * while, and then eventually give up. 9368 */ 9369 case -NFS4ERR_LAYOUTTRYLATER: 9370 if (lgp->args.minlength == 0) { 9371 status = -EOVERFLOW; 9372 goto out; 9373 } 9374 status = -EBUSY; 9375 break; 9376 case -NFS4ERR_RECALLCONFLICT: 9377 status = -ERECALLCONFLICT; 9378 break; 9379 case -NFS4ERR_DELEG_REVOKED: 9380 case -NFS4ERR_ADMIN_REVOKED: 9381 case -NFS4ERR_EXPIRED: 9382 case -NFS4ERR_BAD_STATEID: 9383 exception->timeout = 0; 9384 spin_lock(&inode->i_lock); 9385 lo = NFS_I(inode)->layout; 9386 /* If the open stateid was bad, then recover it. */ 9387 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9388 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9389 spin_unlock(&inode->i_lock); 9390 exception->state = lgp->args.ctx->state; 9391 exception->stateid = &lgp->args.stateid; 9392 break; 9393 } 9394 9395 /* 9396 * Mark the bad layout state as invalid, then retry 9397 */ 9398 pnfs_mark_layout_stateid_invalid(lo, &head); 9399 spin_unlock(&inode->i_lock); 9400 nfs_commit_inode(inode, 0); 9401 pnfs_free_lseg_list(&head); 9402 status = -EAGAIN; 9403 goto out; 9404 } 9405 9406 err = nfs4_handle_exception(server, nfs4err, exception); 9407 if (!status) { 9408 if (exception->retry) 9409 status = -EAGAIN; 9410 else 9411 status = err; 9412 } 9413 out: 9414 dprintk("<-- %s\n", __func__); 9415 return status; 9416 } 9417 9418 size_t max_response_pages(struct nfs_server *server) 9419 { 9420 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9421 return nfs_page_array_len(0, max_resp_sz); 9422 } 9423 9424 static void nfs4_layoutget_release(void *calldata) 9425 { 9426 struct nfs4_layoutget *lgp = calldata; 9427 9428 dprintk("--> %s\n", __func__); 9429 nfs4_sequence_free_slot(&lgp->res.seq_res); 9430 pnfs_layoutget_free(lgp); 9431 dprintk("<-- %s\n", __func__); 9432 } 9433 9434 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9435 .rpc_call_prepare = nfs4_layoutget_prepare, 9436 .rpc_call_done = nfs4_layoutget_done, 9437 .rpc_release = nfs4_layoutget_release, 9438 }; 9439 9440 struct pnfs_layout_segment * 9441 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9442 { 9443 struct inode *inode = lgp->args.inode; 9444 struct nfs_server *server = NFS_SERVER(inode); 9445 struct rpc_task *task; 9446 struct rpc_message msg = { 9447 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9448 .rpc_argp = &lgp->args, 9449 .rpc_resp = &lgp->res, 9450 .rpc_cred = lgp->cred, 9451 }; 9452 struct rpc_task_setup task_setup_data = { 9453 .rpc_client = server->client, 9454 .rpc_message = &msg, 9455 .callback_ops = &nfs4_layoutget_call_ops, 9456 .callback_data = lgp, 9457 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 9458 }; 9459 struct pnfs_layout_segment *lseg = NULL; 9460 struct nfs4_exception exception = { 9461 .inode = inode, 9462 .timeout = *timeout, 9463 }; 9464 int status = 0; 9465 9466 dprintk("--> %s\n", __func__); 9467 9468 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 9469 pnfs_get_layout_hdr(NFS_I(inode)->layout); 9470 9471 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9472 9473 task = rpc_run_task(&task_setup_data); 9474 9475 status = rpc_wait_for_completion_task(task); 9476 if (status != 0) 9477 goto out; 9478 9479 if (task->tk_status < 0) { 9480 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9481 *timeout = exception.timeout; 9482 } else if (lgp->res.layoutp->len == 0) { 9483 status = -EAGAIN; 9484 *timeout = nfs4_update_delay(&exception.timeout); 9485 } else 9486 lseg = pnfs_layout_process(lgp); 9487 out: 9488 trace_nfs4_layoutget(lgp->args.ctx, 9489 &lgp->args.range, 9490 &lgp->res.range, 9491 &lgp->res.stateid, 9492 status); 9493 9494 rpc_put_task(task); 9495 dprintk("<-- %s status=%d\n", __func__, status); 9496 if (status) 9497 return ERR_PTR(status); 9498 return lseg; 9499 } 9500 9501 static void 9502 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9503 { 9504 struct nfs4_layoutreturn *lrp = calldata; 9505 9506 dprintk("--> %s\n", __func__); 9507 nfs4_setup_sequence(lrp->clp, 9508 &lrp->args.seq_args, 9509 &lrp->res.seq_res, 9510 task); 9511 if (!pnfs_layout_is_valid(lrp->args.layout)) 9512 rpc_exit(task, 0); 9513 } 9514 9515 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9516 { 9517 struct nfs4_layoutreturn *lrp = calldata; 9518 struct nfs_server *server; 9519 9520 dprintk("--> %s\n", __func__); 9521 9522 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9523 return; 9524 9525 /* 9526 * Was there an RPC level error? Assume the call succeeded, 9527 * and that we need to release the layout 9528 */ 9529 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9530 lrp->res.lrs_present = 0; 9531 return; 9532 } 9533 9534 server = NFS_SERVER(lrp->args.inode); 9535 switch (task->tk_status) { 9536 case -NFS4ERR_OLD_STATEID: 9537 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9538 &lrp->args.range, 9539 lrp->args.inode)) 9540 goto out_restart; 9541 fallthrough; 9542 default: 9543 task->tk_status = 0; 9544 fallthrough; 9545 case 0: 9546 break; 9547 case -NFS4ERR_DELAY: 9548 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9549 break; 9550 goto out_restart; 9551 } 9552 dprintk("<-- %s\n", __func__); 9553 return; 9554 out_restart: 9555 task->tk_status = 0; 9556 nfs4_sequence_free_slot(&lrp->res.seq_res); 9557 rpc_restart_call_prepare(task); 9558 } 9559 9560 static void nfs4_layoutreturn_release(void *calldata) 9561 { 9562 struct nfs4_layoutreturn *lrp = calldata; 9563 struct pnfs_layout_hdr *lo = lrp->args.layout; 9564 9565 dprintk("--> %s\n", __func__); 9566 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9567 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9568 nfs4_sequence_free_slot(&lrp->res.seq_res); 9569 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9570 lrp->ld_private.ops->free(&lrp->ld_private); 9571 pnfs_put_layout_hdr(lrp->args.layout); 9572 nfs_iput_and_deactive(lrp->inode); 9573 put_cred(lrp->cred); 9574 kfree(calldata); 9575 dprintk("<-- %s\n", __func__); 9576 } 9577 9578 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9579 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9580 .rpc_call_done = nfs4_layoutreturn_done, 9581 .rpc_release = nfs4_layoutreturn_release, 9582 }; 9583 9584 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9585 { 9586 struct rpc_task *task; 9587 struct rpc_message msg = { 9588 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9589 .rpc_argp = &lrp->args, 9590 .rpc_resp = &lrp->res, 9591 .rpc_cred = lrp->cred, 9592 }; 9593 struct rpc_task_setup task_setup_data = { 9594 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9595 .rpc_message = &msg, 9596 .callback_ops = &nfs4_layoutreturn_call_ops, 9597 .callback_data = lrp, 9598 }; 9599 int status = 0; 9600 9601 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9602 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9603 &task_setup_data.rpc_client, &msg); 9604 9605 dprintk("--> %s\n", __func__); 9606 if (!sync) { 9607 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9608 if (!lrp->inode) { 9609 nfs4_layoutreturn_release(lrp); 9610 return -EAGAIN; 9611 } 9612 task_setup_data.flags |= RPC_TASK_ASYNC; 9613 } 9614 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0); 9615 task = rpc_run_task(&task_setup_data); 9616 if (IS_ERR(task)) 9617 return PTR_ERR(task); 9618 if (sync) 9619 status = task->tk_status; 9620 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9621 dprintk("<-- %s status=%d\n", __func__, status); 9622 rpc_put_task(task); 9623 return status; 9624 } 9625 9626 static int 9627 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9628 struct pnfs_device *pdev, 9629 const struct cred *cred) 9630 { 9631 struct nfs4_getdeviceinfo_args args = { 9632 .pdev = pdev, 9633 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9634 NOTIFY_DEVICEID4_DELETE, 9635 }; 9636 struct nfs4_getdeviceinfo_res res = { 9637 .pdev = pdev, 9638 }; 9639 struct rpc_message msg = { 9640 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9641 .rpc_argp = &args, 9642 .rpc_resp = &res, 9643 .rpc_cred = cred, 9644 }; 9645 int status; 9646 9647 dprintk("--> %s\n", __func__); 9648 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9649 if (res.notification & ~args.notify_types) 9650 dprintk("%s: unsupported notification\n", __func__); 9651 if (res.notification != args.notify_types) 9652 pdev->nocache = 1; 9653 9654 dprintk("<-- %s status=%d\n", __func__, status); 9655 9656 return status; 9657 } 9658 9659 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9660 struct pnfs_device *pdev, 9661 const struct cred *cred) 9662 { 9663 struct nfs4_exception exception = { }; 9664 int err; 9665 9666 do { 9667 err = nfs4_handle_exception(server, 9668 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9669 &exception); 9670 } while (exception.retry); 9671 return err; 9672 } 9673 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9674 9675 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9676 { 9677 struct nfs4_layoutcommit_data *data = calldata; 9678 struct nfs_server *server = NFS_SERVER(data->args.inode); 9679 9680 nfs4_setup_sequence(server->nfs_client, 9681 &data->args.seq_args, 9682 &data->res.seq_res, 9683 task); 9684 } 9685 9686 static void 9687 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9688 { 9689 struct nfs4_layoutcommit_data *data = calldata; 9690 struct nfs_server *server = NFS_SERVER(data->args.inode); 9691 9692 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9693 return; 9694 9695 switch (task->tk_status) { /* Just ignore these failures */ 9696 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9697 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9698 case -NFS4ERR_BADLAYOUT: /* no layout */ 9699 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9700 task->tk_status = 0; 9701 case 0: 9702 break; 9703 default: 9704 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9705 rpc_restart_call_prepare(task); 9706 return; 9707 } 9708 } 9709 } 9710 9711 static void nfs4_layoutcommit_release(void *calldata) 9712 { 9713 struct nfs4_layoutcommit_data *data = calldata; 9714 9715 pnfs_cleanup_layoutcommit(data); 9716 nfs_post_op_update_inode_force_wcc(data->args.inode, 9717 data->res.fattr); 9718 put_cred(data->cred); 9719 nfs_iput_and_deactive(data->inode); 9720 kfree(data); 9721 } 9722 9723 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9724 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9725 .rpc_call_done = nfs4_layoutcommit_done, 9726 .rpc_release = nfs4_layoutcommit_release, 9727 }; 9728 9729 int 9730 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9731 { 9732 struct rpc_message msg = { 9733 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9734 .rpc_argp = &data->args, 9735 .rpc_resp = &data->res, 9736 .rpc_cred = data->cred, 9737 }; 9738 struct rpc_task_setup task_setup_data = { 9739 .task = &data->task, 9740 .rpc_client = NFS_CLIENT(data->args.inode), 9741 .rpc_message = &msg, 9742 .callback_ops = &nfs4_layoutcommit_ops, 9743 .callback_data = data, 9744 }; 9745 struct rpc_task *task; 9746 int status = 0; 9747 9748 dprintk("NFS: initiating layoutcommit call. sync %d " 9749 "lbw: %llu inode %lu\n", sync, 9750 data->args.lastbytewritten, 9751 data->args.inode->i_ino); 9752 9753 if (!sync) { 9754 data->inode = nfs_igrab_and_active(data->args.inode); 9755 if (data->inode == NULL) { 9756 nfs4_layoutcommit_release(data); 9757 return -EAGAIN; 9758 } 9759 task_setup_data.flags = RPC_TASK_ASYNC; 9760 } 9761 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 9762 task = rpc_run_task(&task_setup_data); 9763 if (IS_ERR(task)) 9764 return PTR_ERR(task); 9765 if (sync) 9766 status = task->tk_status; 9767 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 9768 dprintk("%s: status %d\n", __func__, status); 9769 rpc_put_task(task); 9770 return status; 9771 } 9772 9773 /* 9774 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 9775 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 9776 */ 9777 static int 9778 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9779 struct nfs_fsinfo *info, 9780 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 9781 { 9782 struct nfs41_secinfo_no_name_args args = { 9783 .style = SECINFO_STYLE_CURRENT_FH, 9784 }; 9785 struct nfs4_secinfo_res res = { 9786 .flavors = flavors, 9787 }; 9788 struct rpc_message msg = { 9789 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 9790 .rpc_argp = &args, 9791 .rpc_resp = &res, 9792 }; 9793 struct nfs4_call_sync_data data = { 9794 .seq_server = server, 9795 .seq_args = &args.seq_args, 9796 .seq_res = &res.seq_res, 9797 }; 9798 struct rpc_task_setup task_setup = { 9799 .rpc_client = server->client, 9800 .rpc_message = &msg, 9801 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 9802 .callback_data = &data, 9803 .flags = RPC_TASK_NO_ROUND_ROBIN, 9804 }; 9805 const struct cred *cred = NULL; 9806 int status; 9807 9808 if (use_integrity) { 9809 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 9810 9811 cred = nfs4_get_clid_cred(server->nfs_client); 9812 msg.rpc_cred = cred; 9813 } 9814 9815 dprintk("--> %s\n", __func__); 9816 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 9817 status = nfs4_call_sync_custom(&task_setup); 9818 dprintk("<-- %s status=%d\n", __func__, status); 9819 9820 put_cred(cred); 9821 9822 return status; 9823 } 9824 9825 static int 9826 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9827 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 9828 { 9829 struct nfs4_exception exception = { 9830 .interruptible = true, 9831 }; 9832 int err; 9833 do { 9834 /* first try using integrity protection */ 9835 err = -NFS4ERR_WRONGSEC; 9836 9837 /* try to use integrity protection with machine cred */ 9838 if (_nfs4_is_integrity_protected(server->nfs_client)) 9839 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9840 flavors, true); 9841 9842 /* 9843 * if unable to use integrity protection, or SECINFO with 9844 * integrity protection returns NFS4ERR_WRONGSEC (which is 9845 * disallowed by spec, but exists in deployed servers) use 9846 * the current filesystem's rpc_client and the user cred. 9847 */ 9848 if (err == -NFS4ERR_WRONGSEC) 9849 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9850 flavors, false); 9851 9852 switch (err) { 9853 case 0: 9854 case -NFS4ERR_WRONGSEC: 9855 case -ENOTSUPP: 9856 goto out; 9857 default: 9858 err = nfs4_handle_exception(server, err, &exception); 9859 } 9860 } while (exception.retry); 9861 out: 9862 return err; 9863 } 9864 9865 static int 9866 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 9867 struct nfs_fsinfo *info) 9868 { 9869 int err; 9870 struct page *page; 9871 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 9872 struct nfs4_secinfo_flavors *flavors; 9873 struct nfs4_secinfo4 *secinfo; 9874 int i; 9875 9876 page = alloc_page(GFP_KERNEL); 9877 if (!page) { 9878 err = -ENOMEM; 9879 goto out; 9880 } 9881 9882 flavors = page_address(page); 9883 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 9884 9885 /* 9886 * Fall back on "guess and check" method if 9887 * the server doesn't support SECINFO_NO_NAME 9888 */ 9889 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 9890 err = nfs4_find_root_sec(server, fhandle, info); 9891 goto out_freepage; 9892 } 9893 if (err) 9894 goto out_freepage; 9895 9896 for (i = 0; i < flavors->num_flavors; i++) { 9897 secinfo = &flavors->flavors[i]; 9898 9899 switch (secinfo->flavor) { 9900 case RPC_AUTH_NULL: 9901 case RPC_AUTH_UNIX: 9902 case RPC_AUTH_GSS: 9903 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 9904 &secinfo->flavor_info); 9905 break; 9906 default: 9907 flavor = RPC_AUTH_MAXFLAVOR; 9908 break; 9909 } 9910 9911 if (!nfs_auth_info_match(&server->auth_info, flavor)) 9912 flavor = RPC_AUTH_MAXFLAVOR; 9913 9914 if (flavor != RPC_AUTH_MAXFLAVOR) { 9915 err = nfs4_lookup_root_sec(server, fhandle, 9916 info, flavor); 9917 if (!err) 9918 break; 9919 } 9920 } 9921 9922 if (flavor == RPC_AUTH_MAXFLAVOR) 9923 err = -EPERM; 9924 9925 out_freepage: 9926 put_page(page); 9927 if (err == -EACCES) 9928 return -EPERM; 9929 out: 9930 return err; 9931 } 9932 9933 static int _nfs41_test_stateid(struct nfs_server *server, 9934 nfs4_stateid *stateid, 9935 const struct cred *cred) 9936 { 9937 int status; 9938 struct nfs41_test_stateid_args args = { 9939 .stateid = stateid, 9940 }; 9941 struct nfs41_test_stateid_res res; 9942 struct rpc_message msg = { 9943 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 9944 .rpc_argp = &args, 9945 .rpc_resp = &res, 9946 .rpc_cred = cred, 9947 }; 9948 struct rpc_clnt *rpc_client = server->client; 9949 9950 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9951 &rpc_client, &msg); 9952 9953 dprintk("NFS call test_stateid %p\n", stateid); 9954 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 9955 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 9956 &args.seq_args, &res.seq_res); 9957 if (status != NFS_OK) { 9958 dprintk("NFS reply test_stateid: failed, %d\n", status); 9959 return status; 9960 } 9961 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 9962 return -res.status; 9963 } 9964 9965 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 9966 int err, struct nfs4_exception *exception) 9967 { 9968 exception->retry = 0; 9969 switch(err) { 9970 case -NFS4ERR_DELAY: 9971 case -NFS4ERR_RETRY_UNCACHED_REP: 9972 nfs4_handle_exception(server, err, exception); 9973 break; 9974 case -NFS4ERR_BADSESSION: 9975 case -NFS4ERR_BADSLOT: 9976 case -NFS4ERR_BAD_HIGH_SLOT: 9977 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9978 case -NFS4ERR_DEADSESSION: 9979 nfs4_do_handle_exception(server, err, exception); 9980 } 9981 } 9982 9983 /** 9984 * nfs41_test_stateid - perform a TEST_STATEID operation 9985 * 9986 * @server: server / transport on which to perform the operation 9987 * @stateid: state ID to test 9988 * @cred: credential 9989 * 9990 * Returns NFS_OK if the server recognizes that "stateid" is valid. 9991 * Otherwise a negative NFS4ERR value is returned if the operation 9992 * failed or the state ID is not currently valid. 9993 */ 9994 static int nfs41_test_stateid(struct nfs_server *server, 9995 nfs4_stateid *stateid, 9996 const struct cred *cred) 9997 { 9998 struct nfs4_exception exception = { 9999 .interruptible = true, 10000 }; 10001 int err; 10002 do { 10003 err = _nfs41_test_stateid(server, stateid, cred); 10004 nfs4_handle_delay_or_session_error(server, err, &exception); 10005 } while (exception.retry); 10006 return err; 10007 } 10008 10009 struct nfs_free_stateid_data { 10010 struct nfs_server *server; 10011 struct nfs41_free_stateid_args args; 10012 struct nfs41_free_stateid_res res; 10013 }; 10014 10015 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10016 { 10017 struct nfs_free_stateid_data *data = calldata; 10018 nfs4_setup_sequence(data->server->nfs_client, 10019 &data->args.seq_args, 10020 &data->res.seq_res, 10021 task); 10022 } 10023 10024 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10025 { 10026 struct nfs_free_stateid_data *data = calldata; 10027 10028 nfs41_sequence_done(task, &data->res.seq_res); 10029 10030 switch (task->tk_status) { 10031 case -NFS4ERR_DELAY: 10032 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10033 rpc_restart_call_prepare(task); 10034 } 10035 } 10036 10037 static void nfs41_free_stateid_release(void *calldata) 10038 { 10039 kfree(calldata); 10040 } 10041 10042 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10043 .rpc_call_prepare = nfs41_free_stateid_prepare, 10044 .rpc_call_done = nfs41_free_stateid_done, 10045 .rpc_release = nfs41_free_stateid_release, 10046 }; 10047 10048 /** 10049 * nfs41_free_stateid - perform a FREE_STATEID operation 10050 * 10051 * @server: server / transport on which to perform the operation 10052 * @stateid: state ID to release 10053 * @cred: credential 10054 * @privileged: set to true if this call needs to be privileged 10055 * 10056 * Note: this function is always asynchronous. 10057 */ 10058 static int nfs41_free_stateid(struct nfs_server *server, 10059 const nfs4_stateid *stateid, 10060 const struct cred *cred, 10061 bool privileged) 10062 { 10063 struct rpc_message msg = { 10064 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10065 .rpc_cred = cred, 10066 }; 10067 struct rpc_task_setup task_setup = { 10068 .rpc_client = server->client, 10069 .rpc_message = &msg, 10070 .callback_ops = &nfs41_free_stateid_ops, 10071 .flags = RPC_TASK_ASYNC, 10072 }; 10073 struct nfs_free_stateid_data *data; 10074 struct rpc_task *task; 10075 10076 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10077 &task_setup.rpc_client, &msg); 10078 10079 dprintk("NFS call free_stateid %p\n", stateid); 10080 data = kmalloc(sizeof(*data), GFP_NOFS); 10081 if (!data) 10082 return -ENOMEM; 10083 data->server = server; 10084 nfs4_stateid_copy(&data->args.stateid, stateid); 10085 10086 task_setup.callback_data = data; 10087 10088 msg.rpc_argp = &data->args; 10089 msg.rpc_resp = &data->res; 10090 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10091 task = rpc_run_task(&task_setup); 10092 if (IS_ERR(task)) 10093 return PTR_ERR(task); 10094 rpc_put_task(task); 10095 return 0; 10096 } 10097 10098 static void 10099 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10100 { 10101 const struct cred *cred = lsp->ls_state->owner->so_cred; 10102 10103 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10104 nfs4_free_lock_state(server, lsp); 10105 } 10106 10107 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10108 const nfs4_stateid *s2) 10109 { 10110 if (s1->type != s2->type) 10111 return false; 10112 10113 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10114 return false; 10115 10116 if (s1->seqid == s2->seqid) 10117 return true; 10118 10119 return s1->seqid == 0 || s2->seqid == 0; 10120 } 10121 10122 #endif /* CONFIG_NFS_V4_1 */ 10123 10124 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10125 const nfs4_stateid *s2) 10126 { 10127 return nfs4_stateid_match(s1, s2); 10128 } 10129 10130 10131 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10132 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10133 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10134 .recover_open = nfs4_open_reclaim, 10135 .recover_lock = nfs4_lock_reclaim, 10136 .establish_clid = nfs4_init_clientid, 10137 .detect_trunking = nfs40_discover_server_trunking, 10138 }; 10139 10140 #if defined(CONFIG_NFS_V4_1) 10141 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10142 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10143 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10144 .recover_open = nfs4_open_reclaim, 10145 .recover_lock = nfs4_lock_reclaim, 10146 .establish_clid = nfs41_init_clientid, 10147 .reclaim_complete = nfs41_proc_reclaim_complete, 10148 .detect_trunking = nfs41_discover_server_trunking, 10149 }; 10150 #endif /* CONFIG_NFS_V4_1 */ 10151 10152 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10153 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10154 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10155 .recover_open = nfs40_open_expired, 10156 .recover_lock = nfs4_lock_expired, 10157 .establish_clid = nfs4_init_clientid, 10158 }; 10159 10160 #if defined(CONFIG_NFS_V4_1) 10161 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10162 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10163 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10164 .recover_open = nfs41_open_expired, 10165 .recover_lock = nfs41_lock_expired, 10166 .establish_clid = nfs41_init_clientid, 10167 }; 10168 #endif /* CONFIG_NFS_V4_1 */ 10169 10170 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10171 .sched_state_renewal = nfs4_proc_async_renew, 10172 .get_state_renewal_cred = nfs4_get_renew_cred, 10173 .renew_lease = nfs4_proc_renew, 10174 }; 10175 10176 #if defined(CONFIG_NFS_V4_1) 10177 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10178 .sched_state_renewal = nfs41_proc_async_sequence, 10179 .get_state_renewal_cred = nfs4_get_machine_cred, 10180 .renew_lease = nfs4_proc_sequence, 10181 }; 10182 #endif 10183 10184 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10185 .get_locations = _nfs40_proc_get_locations, 10186 .fsid_present = _nfs40_proc_fsid_present, 10187 }; 10188 10189 #if defined(CONFIG_NFS_V4_1) 10190 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10191 .get_locations = _nfs41_proc_get_locations, 10192 .fsid_present = _nfs41_proc_fsid_present, 10193 }; 10194 #endif /* CONFIG_NFS_V4_1 */ 10195 10196 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10197 .minor_version = 0, 10198 .init_caps = NFS_CAP_READDIRPLUS 10199 | NFS_CAP_ATOMIC_OPEN 10200 | NFS_CAP_POSIX_LOCK, 10201 .init_client = nfs40_init_client, 10202 .shutdown_client = nfs40_shutdown_client, 10203 .match_stateid = nfs4_match_stateid, 10204 .find_root_sec = nfs4_find_root_sec, 10205 .free_lock_state = nfs4_release_lockowner, 10206 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10207 .alloc_seqid = nfs_alloc_seqid, 10208 .call_sync_ops = &nfs40_call_sync_ops, 10209 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10210 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10211 .state_renewal_ops = &nfs40_state_renewal_ops, 10212 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10213 }; 10214 10215 #if defined(CONFIG_NFS_V4_1) 10216 static struct nfs_seqid * 10217 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10218 { 10219 return NULL; 10220 } 10221 10222 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10223 .minor_version = 1, 10224 .init_caps = NFS_CAP_READDIRPLUS 10225 | NFS_CAP_ATOMIC_OPEN 10226 | NFS_CAP_POSIX_LOCK 10227 | NFS_CAP_STATEID_NFSV41 10228 | NFS_CAP_ATOMIC_OPEN_V1 10229 | NFS_CAP_LGOPEN, 10230 .init_client = nfs41_init_client, 10231 .shutdown_client = nfs41_shutdown_client, 10232 .match_stateid = nfs41_match_stateid, 10233 .find_root_sec = nfs41_find_root_sec, 10234 .free_lock_state = nfs41_free_lock_state, 10235 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10236 .alloc_seqid = nfs_alloc_no_seqid, 10237 .session_trunk = nfs4_test_session_trunk, 10238 .call_sync_ops = &nfs41_call_sync_ops, 10239 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10240 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10241 .state_renewal_ops = &nfs41_state_renewal_ops, 10242 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10243 }; 10244 #endif 10245 10246 #if defined(CONFIG_NFS_V4_2) 10247 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10248 .minor_version = 2, 10249 .init_caps = NFS_CAP_READDIRPLUS 10250 | NFS_CAP_ATOMIC_OPEN 10251 | NFS_CAP_POSIX_LOCK 10252 | NFS_CAP_STATEID_NFSV41 10253 | NFS_CAP_ATOMIC_OPEN_V1 10254 | NFS_CAP_LGOPEN 10255 | NFS_CAP_ALLOCATE 10256 | NFS_CAP_COPY 10257 | NFS_CAP_OFFLOAD_CANCEL 10258 | NFS_CAP_COPY_NOTIFY 10259 | NFS_CAP_DEALLOCATE 10260 | NFS_CAP_SEEK 10261 | NFS_CAP_LAYOUTSTATS 10262 | NFS_CAP_CLONE 10263 | NFS_CAP_LAYOUTERROR 10264 | NFS_CAP_READ_PLUS, 10265 .init_client = nfs41_init_client, 10266 .shutdown_client = nfs41_shutdown_client, 10267 .match_stateid = nfs41_match_stateid, 10268 .find_root_sec = nfs41_find_root_sec, 10269 .free_lock_state = nfs41_free_lock_state, 10270 .call_sync_ops = &nfs41_call_sync_ops, 10271 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10272 .alloc_seqid = nfs_alloc_no_seqid, 10273 .session_trunk = nfs4_test_session_trunk, 10274 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10275 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10276 .state_renewal_ops = &nfs41_state_renewal_ops, 10277 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10278 }; 10279 #endif 10280 10281 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10282 [0] = &nfs_v4_0_minor_ops, 10283 #if defined(CONFIG_NFS_V4_1) 10284 [1] = &nfs_v4_1_minor_ops, 10285 #endif 10286 #if defined(CONFIG_NFS_V4_2) 10287 [2] = &nfs_v4_2_minor_ops, 10288 #endif 10289 }; 10290 10291 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10292 { 10293 ssize_t error, error2, error3; 10294 10295 error = generic_listxattr(dentry, list, size); 10296 if (error < 0) 10297 return error; 10298 if (list) { 10299 list += error; 10300 size -= error; 10301 } 10302 10303 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10304 if (error2 < 0) 10305 return error2; 10306 10307 if (list) { 10308 list += error2; 10309 size -= error2; 10310 } 10311 10312 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10313 if (error3 < 0) 10314 return error3; 10315 10316 return error + error2 + error3; 10317 } 10318 10319 static const struct inode_operations nfs4_dir_inode_operations = { 10320 .create = nfs_create, 10321 .lookup = nfs_lookup, 10322 .atomic_open = nfs_atomic_open, 10323 .link = nfs_link, 10324 .unlink = nfs_unlink, 10325 .symlink = nfs_symlink, 10326 .mkdir = nfs_mkdir, 10327 .rmdir = nfs_rmdir, 10328 .mknod = nfs_mknod, 10329 .rename = nfs_rename, 10330 .permission = nfs_permission, 10331 .getattr = nfs_getattr, 10332 .setattr = nfs_setattr, 10333 .listxattr = nfs4_listxattr, 10334 }; 10335 10336 static const struct inode_operations nfs4_file_inode_operations = { 10337 .permission = nfs_permission, 10338 .getattr = nfs_getattr, 10339 .setattr = nfs_setattr, 10340 .listxattr = nfs4_listxattr, 10341 }; 10342 10343 const struct nfs_rpc_ops nfs_v4_clientops = { 10344 .version = 4, /* protocol version */ 10345 .dentry_ops = &nfs4_dentry_operations, 10346 .dir_inode_ops = &nfs4_dir_inode_operations, 10347 .file_inode_ops = &nfs4_file_inode_operations, 10348 .file_ops = &nfs4_file_operations, 10349 .getroot = nfs4_proc_get_root, 10350 .submount = nfs4_submount, 10351 .try_get_tree = nfs4_try_get_tree, 10352 .getattr = nfs4_proc_getattr, 10353 .setattr = nfs4_proc_setattr, 10354 .lookup = nfs4_proc_lookup, 10355 .lookupp = nfs4_proc_lookupp, 10356 .access = nfs4_proc_access, 10357 .readlink = nfs4_proc_readlink, 10358 .create = nfs4_proc_create, 10359 .remove = nfs4_proc_remove, 10360 .unlink_setup = nfs4_proc_unlink_setup, 10361 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10362 .unlink_done = nfs4_proc_unlink_done, 10363 .rename_setup = nfs4_proc_rename_setup, 10364 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10365 .rename_done = nfs4_proc_rename_done, 10366 .link = nfs4_proc_link, 10367 .symlink = nfs4_proc_symlink, 10368 .mkdir = nfs4_proc_mkdir, 10369 .rmdir = nfs4_proc_rmdir, 10370 .readdir = nfs4_proc_readdir, 10371 .mknod = nfs4_proc_mknod, 10372 .statfs = nfs4_proc_statfs, 10373 .fsinfo = nfs4_proc_fsinfo, 10374 .pathconf = nfs4_proc_pathconf, 10375 .set_capabilities = nfs4_server_capabilities, 10376 .decode_dirent = nfs4_decode_dirent, 10377 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10378 .read_setup = nfs4_proc_read_setup, 10379 .read_done = nfs4_read_done, 10380 .write_setup = nfs4_proc_write_setup, 10381 .write_done = nfs4_write_done, 10382 .commit_setup = nfs4_proc_commit_setup, 10383 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10384 .commit_done = nfs4_commit_done, 10385 .lock = nfs4_proc_lock, 10386 .clear_acl_cache = nfs4_zap_acl_attr, 10387 .close_context = nfs4_close_context, 10388 .open_context = nfs4_atomic_open, 10389 .have_delegation = nfs4_have_delegation, 10390 .alloc_client = nfs4_alloc_client, 10391 .init_client = nfs4_init_client, 10392 .free_client = nfs4_free_client, 10393 .create_server = nfs4_create_server, 10394 .clone_server = nfs_clone_server, 10395 }; 10396 10397 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10398 .name = XATTR_NAME_NFSV4_ACL, 10399 .list = nfs4_xattr_list_nfs4_acl, 10400 .get = nfs4_xattr_get_nfs4_acl, 10401 .set = nfs4_xattr_set_nfs4_acl, 10402 }; 10403 10404 #ifdef CONFIG_NFS_V4_2 10405 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10406 .prefix = XATTR_USER_PREFIX, 10407 .get = nfs4_xattr_get_nfs4_user, 10408 .set = nfs4_xattr_set_nfs4_user, 10409 }; 10410 #endif 10411 10412 const struct xattr_handler *nfs4_xattr_handlers[] = { 10413 &nfs4_xattr_nfs4_acl_handler, 10414 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10415 &nfs4_xattr_nfs4_label_handler, 10416 #endif 10417 #ifdef CONFIG_NFS_V4_2 10418 &nfs4_xattr_nfs4_user_handler, 10419 #endif 10420 NULL 10421 }; 10422 10423 /* 10424 * Local variables: 10425 * c-basic-offset: 8 10426 * End: 10427 */ 10428