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 #define NFSDBG_FACILITY NFSDBG_PROC 75 76 #define NFS4_BITMASK_SZ 3 77 78 #define NFS4_POLL_RETRY_MIN (HZ/10) 79 #define NFS4_POLL_RETRY_MAX (15*HZ) 80 81 /* file attributes which can be mapped to nfs attributes */ 82 #define NFS4_VALID_ATTRS (ATTR_MODE \ 83 | ATTR_UID \ 84 | ATTR_GID \ 85 | ATTR_SIZE \ 86 | ATTR_ATIME \ 87 | ATTR_MTIME \ 88 | ATTR_CTIME \ 89 | ATTR_ATIME_SET \ 90 | ATTR_MTIME_SET) 91 92 struct nfs4_opendata; 93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 97 struct nfs_fattr *fattr, struct inode *inode); 98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 99 struct nfs_fattr *fattr, struct iattr *sattr, 100 struct nfs_open_context *ctx, struct nfs4_label *ilabel); 101 #ifdef CONFIG_NFS_V4_1 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 103 const struct cred *cred, 104 struct nfs4_slot *slot, 105 bool is_privileged); 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 107 const struct cred *); 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 109 const struct cred *, bool); 110 #endif 111 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 113 static inline struct nfs4_label * 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 115 struct iattr *sattr, struct nfs4_label *label) 116 { 117 int err; 118 119 if (label == NULL) 120 return NULL; 121 122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 123 return NULL; 124 125 err = security_dentry_init_security(dentry, sattr->ia_mode, 126 &dentry->d_name, NULL, 127 (void **)&label->label, &label->len); 128 if (err == 0) 129 return label; 130 131 return NULL; 132 } 133 static inline void 134 nfs4_label_release_security(struct nfs4_label *label) 135 { 136 if (label) 137 security_release_secctx(label->label, label->len); 138 } 139 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 140 { 141 if (label) 142 return server->attr_bitmask; 143 144 return server->attr_bitmask_nl; 145 } 146 #else 147 static inline struct nfs4_label * 148 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 149 struct iattr *sattr, struct nfs4_label *l) 150 { return NULL; } 151 static inline void 152 nfs4_label_release_security(struct nfs4_label *label) 153 { return; } 154 static inline u32 * 155 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 156 { return server->attr_bitmask; } 157 #endif 158 159 /* Prevent leaks of NFSv4 errors into userland */ 160 static int nfs4_map_errors(int err) 161 { 162 if (err >= -1000) 163 return err; 164 switch (err) { 165 case -NFS4ERR_RESOURCE: 166 case -NFS4ERR_LAYOUTTRYLATER: 167 case -NFS4ERR_RECALLCONFLICT: 168 return -EREMOTEIO; 169 case -NFS4ERR_WRONGSEC: 170 case -NFS4ERR_WRONG_CRED: 171 return -EPERM; 172 case -NFS4ERR_BADOWNER: 173 case -NFS4ERR_BADNAME: 174 return -EINVAL; 175 case -NFS4ERR_SHARE_DENIED: 176 return -EACCES; 177 case -NFS4ERR_MINOR_VERS_MISMATCH: 178 return -EPROTONOSUPPORT; 179 case -NFS4ERR_FILE_OPEN: 180 return -EBUSY; 181 case -NFS4ERR_NOT_SAME: 182 return -ENOTSYNC; 183 default: 184 dprintk("%s could not handle NFSv4 error %d\n", 185 __func__, -err); 186 break; 187 } 188 return -EIO; 189 } 190 191 /* 192 * This is our standard bitmap for GETATTR requests. 193 */ 194 const u32 nfs4_fattr_bitmap[3] = { 195 FATTR4_WORD0_TYPE 196 | FATTR4_WORD0_CHANGE 197 | FATTR4_WORD0_SIZE 198 | FATTR4_WORD0_FSID 199 | FATTR4_WORD0_FILEID, 200 FATTR4_WORD1_MODE 201 | FATTR4_WORD1_NUMLINKS 202 | FATTR4_WORD1_OWNER 203 | FATTR4_WORD1_OWNER_GROUP 204 | FATTR4_WORD1_RAWDEV 205 | FATTR4_WORD1_SPACE_USED 206 | FATTR4_WORD1_TIME_ACCESS 207 | FATTR4_WORD1_TIME_METADATA 208 | FATTR4_WORD1_TIME_MODIFY 209 | FATTR4_WORD1_MOUNTED_ON_FILEID, 210 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 211 FATTR4_WORD2_SECURITY_LABEL 212 #endif 213 }; 214 215 static const u32 nfs4_pnfs_open_bitmap[3] = { 216 FATTR4_WORD0_TYPE 217 | FATTR4_WORD0_CHANGE 218 | FATTR4_WORD0_SIZE 219 | FATTR4_WORD0_FSID 220 | FATTR4_WORD0_FILEID, 221 FATTR4_WORD1_MODE 222 | FATTR4_WORD1_NUMLINKS 223 | FATTR4_WORD1_OWNER 224 | FATTR4_WORD1_OWNER_GROUP 225 | FATTR4_WORD1_RAWDEV 226 | FATTR4_WORD1_SPACE_USED 227 | FATTR4_WORD1_TIME_ACCESS 228 | FATTR4_WORD1_TIME_METADATA 229 | FATTR4_WORD1_TIME_MODIFY, 230 FATTR4_WORD2_MDSTHRESHOLD 231 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 232 | FATTR4_WORD2_SECURITY_LABEL 233 #endif 234 }; 235 236 static const u32 nfs4_open_noattr_bitmap[3] = { 237 FATTR4_WORD0_TYPE 238 | FATTR4_WORD0_FILEID, 239 }; 240 241 const u32 nfs4_statfs_bitmap[3] = { 242 FATTR4_WORD0_FILES_AVAIL 243 | FATTR4_WORD0_FILES_FREE 244 | FATTR4_WORD0_FILES_TOTAL, 245 FATTR4_WORD1_SPACE_AVAIL 246 | FATTR4_WORD1_SPACE_FREE 247 | FATTR4_WORD1_SPACE_TOTAL 248 }; 249 250 const u32 nfs4_pathconf_bitmap[3] = { 251 FATTR4_WORD0_MAXLINK 252 | FATTR4_WORD0_MAXNAME, 253 0 254 }; 255 256 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 257 | FATTR4_WORD0_MAXREAD 258 | FATTR4_WORD0_MAXWRITE 259 | FATTR4_WORD0_LEASE_TIME, 260 FATTR4_WORD1_TIME_DELTA 261 | FATTR4_WORD1_FS_LAYOUT_TYPES, 262 FATTR4_WORD2_LAYOUT_BLKSIZE 263 | FATTR4_WORD2_CLONE_BLKSIZE 264 | FATTR4_WORD2_CHANGE_ATTR_TYPE 265 | FATTR4_WORD2_XATTR_SUPPORT 266 }; 267 268 const u32 nfs4_fs_locations_bitmap[3] = { 269 FATTR4_WORD0_CHANGE 270 | FATTR4_WORD0_SIZE 271 | FATTR4_WORD0_FSID 272 | FATTR4_WORD0_FILEID 273 | FATTR4_WORD0_FS_LOCATIONS, 274 FATTR4_WORD1_OWNER 275 | FATTR4_WORD1_OWNER_GROUP 276 | FATTR4_WORD1_RAWDEV 277 | FATTR4_WORD1_SPACE_USED 278 | FATTR4_WORD1_TIME_ACCESS 279 | FATTR4_WORD1_TIME_METADATA 280 | FATTR4_WORD1_TIME_MODIFY 281 | FATTR4_WORD1_MOUNTED_ON_FILEID, 282 }; 283 284 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 285 struct inode *inode, unsigned long flags) 286 { 287 unsigned long cache_validity; 288 289 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 290 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 291 return; 292 293 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 294 295 /* Remove the attributes over which we have full control */ 296 dst[1] &= ~FATTR4_WORD1_RAWDEV; 297 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 298 dst[0] &= ~FATTR4_WORD0_SIZE; 299 300 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 301 dst[0] &= ~FATTR4_WORD0_CHANGE; 302 303 if (!(cache_validity & NFS_INO_INVALID_MODE)) 304 dst[1] &= ~FATTR4_WORD1_MODE; 305 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 306 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 307 } 308 309 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 310 struct nfs4_readdir_arg *readdir) 311 { 312 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 313 __be32 *start, *p; 314 315 if (cookie > 2) { 316 readdir->cookie = cookie; 317 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 318 return; 319 } 320 321 readdir->cookie = 0; 322 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 323 if (cookie == 2) 324 return; 325 326 /* 327 * NFSv4 servers do not return entries for '.' and '..' 328 * Therefore, we fake these entries here. We let '.' 329 * have cookie 0 and '..' have cookie 1. Note that 330 * when talking to the server, we always send cookie 0 331 * instead of 1 or 2. 332 */ 333 start = p = kmap_atomic(*readdir->pages); 334 335 if (cookie == 0) { 336 *p++ = xdr_one; /* next */ 337 *p++ = xdr_zero; /* cookie, first word */ 338 *p++ = xdr_one; /* cookie, second word */ 339 *p++ = xdr_one; /* entry len */ 340 memcpy(p, ".\0\0\0", 4); /* entry */ 341 p++; 342 *p++ = xdr_one; /* bitmap length */ 343 *p++ = htonl(attrs); /* bitmap */ 344 *p++ = htonl(12); /* attribute buffer length */ 345 *p++ = htonl(NF4DIR); 346 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 347 } 348 349 *p++ = xdr_one; /* next */ 350 *p++ = xdr_zero; /* cookie, first word */ 351 *p++ = xdr_two; /* cookie, second word */ 352 *p++ = xdr_two; /* entry len */ 353 memcpy(p, "..\0\0", 4); /* entry */ 354 p++; 355 *p++ = xdr_one; /* bitmap length */ 356 *p++ = htonl(attrs); /* bitmap */ 357 *p++ = htonl(12); /* attribute buffer length */ 358 *p++ = htonl(NF4DIR); 359 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 360 361 readdir->pgbase = (char *)p - (char *)start; 362 readdir->count -= readdir->pgbase; 363 kunmap_atomic(start); 364 } 365 366 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 367 { 368 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 369 fattr->pre_change_attr = version; 370 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 371 } 372 } 373 374 static void nfs4_test_and_free_stateid(struct nfs_server *server, 375 nfs4_stateid *stateid, 376 const struct cred *cred) 377 { 378 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 379 380 ops->test_and_free_expired(server, stateid, cred); 381 } 382 383 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 384 nfs4_stateid *stateid, 385 const struct cred *cred) 386 { 387 stateid->type = NFS4_REVOKED_STATEID_TYPE; 388 nfs4_test_and_free_stateid(server, stateid, cred); 389 } 390 391 static void nfs4_free_revoked_stateid(struct nfs_server *server, 392 const nfs4_stateid *stateid, 393 const struct cred *cred) 394 { 395 nfs4_stateid tmp; 396 397 nfs4_stateid_copy(&tmp, stateid); 398 __nfs4_free_revoked_stateid(server, &tmp, cred); 399 } 400 401 static long nfs4_update_delay(long *timeout) 402 { 403 long ret; 404 if (!timeout) 405 return NFS4_POLL_RETRY_MAX; 406 if (*timeout <= 0) 407 *timeout = NFS4_POLL_RETRY_MIN; 408 if (*timeout > NFS4_POLL_RETRY_MAX) 409 *timeout = NFS4_POLL_RETRY_MAX; 410 ret = *timeout; 411 *timeout <<= 1; 412 return ret; 413 } 414 415 static int nfs4_delay_killable(long *timeout) 416 { 417 might_sleep(); 418 419 freezable_schedule_timeout_killable_unsafe( 420 nfs4_update_delay(timeout)); 421 if (!__fatal_signal_pending(current)) 422 return 0; 423 return -EINTR; 424 } 425 426 static int nfs4_delay_interruptible(long *timeout) 427 { 428 might_sleep(); 429 430 freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout)); 431 if (!signal_pending(current)) 432 return 0; 433 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 434 } 435 436 static int nfs4_delay(long *timeout, bool interruptible) 437 { 438 if (interruptible) 439 return nfs4_delay_interruptible(timeout); 440 return nfs4_delay_killable(timeout); 441 } 442 443 static const nfs4_stateid * 444 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 445 { 446 if (!stateid) 447 return NULL; 448 switch (stateid->type) { 449 case NFS4_OPEN_STATEID_TYPE: 450 case NFS4_LOCK_STATEID_TYPE: 451 case NFS4_DELEGATION_STATEID_TYPE: 452 return stateid; 453 default: 454 break; 455 } 456 return NULL; 457 } 458 459 /* This is the error handling routine for processes that are allowed 460 * to sleep. 461 */ 462 static int nfs4_do_handle_exception(struct nfs_server *server, 463 int errorcode, struct nfs4_exception *exception) 464 { 465 struct nfs_client *clp = server->nfs_client; 466 struct nfs4_state *state = exception->state; 467 const nfs4_stateid *stateid; 468 struct inode *inode = exception->inode; 469 int ret = errorcode; 470 471 exception->delay = 0; 472 exception->recovering = 0; 473 exception->retry = 0; 474 475 stateid = nfs4_recoverable_stateid(exception->stateid); 476 if (stateid == NULL && state != NULL) 477 stateid = nfs4_recoverable_stateid(&state->stateid); 478 479 switch(errorcode) { 480 case 0: 481 return 0; 482 case -NFS4ERR_BADHANDLE: 483 case -ESTALE: 484 if (inode != NULL && S_ISREG(inode->i_mode)) 485 pnfs_destroy_layout(NFS_I(inode)); 486 break; 487 case -NFS4ERR_DELEG_REVOKED: 488 case -NFS4ERR_ADMIN_REVOKED: 489 case -NFS4ERR_EXPIRED: 490 case -NFS4ERR_BAD_STATEID: 491 case -NFS4ERR_PARTNER_NO_AUTH: 492 if (inode != NULL && stateid != NULL) { 493 nfs_inode_find_state_and_recover(inode, 494 stateid); 495 goto wait_on_recovery; 496 } 497 fallthrough; 498 case -NFS4ERR_OPENMODE: 499 if (inode) { 500 int err; 501 502 err = nfs_async_inode_return_delegation(inode, 503 stateid); 504 if (err == 0) 505 goto wait_on_recovery; 506 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 507 exception->retry = 1; 508 break; 509 } 510 } 511 if (state == NULL) 512 break; 513 ret = nfs4_schedule_stateid_recovery(server, state); 514 if (ret < 0) 515 break; 516 goto wait_on_recovery; 517 case -NFS4ERR_STALE_STATEID: 518 case -NFS4ERR_STALE_CLIENTID: 519 nfs4_schedule_lease_recovery(clp); 520 goto wait_on_recovery; 521 case -NFS4ERR_MOVED: 522 ret = nfs4_schedule_migration_recovery(server); 523 if (ret < 0) 524 break; 525 goto wait_on_recovery; 526 case -NFS4ERR_LEASE_MOVED: 527 nfs4_schedule_lease_moved_recovery(clp); 528 goto wait_on_recovery; 529 #if defined(CONFIG_NFS_V4_1) 530 case -NFS4ERR_BADSESSION: 531 case -NFS4ERR_BADSLOT: 532 case -NFS4ERR_BAD_HIGH_SLOT: 533 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 534 case -NFS4ERR_DEADSESSION: 535 case -NFS4ERR_SEQ_FALSE_RETRY: 536 case -NFS4ERR_SEQ_MISORDERED: 537 /* Handled in nfs41_sequence_process() */ 538 goto wait_on_recovery; 539 #endif /* defined(CONFIG_NFS_V4_1) */ 540 case -NFS4ERR_FILE_OPEN: 541 if (exception->timeout > HZ) { 542 /* We have retried a decent amount, time to 543 * fail 544 */ 545 ret = -EBUSY; 546 break; 547 } 548 fallthrough; 549 case -NFS4ERR_DELAY: 550 nfs_inc_server_stats(server, NFSIOS_DELAY); 551 fallthrough; 552 case -NFS4ERR_GRACE: 553 case -NFS4ERR_LAYOUTTRYLATER: 554 case -NFS4ERR_RECALLCONFLICT: 555 exception->delay = 1; 556 return 0; 557 558 case -NFS4ERR_RETRY_UNCACHED_REP: 559 case -NFS4ERR_OLD_STATEID: 560 exception->retry = 1; 561 break; 562 case -NFS4ERR_BADOWNER: 563 /* The following works around a Linux server bug! */ 564 case -NFS4ERR_BADNAME: 565 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 566 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 567 exception->retry = 1; 568 printk(KERN_WARNING "NFS: v4 server %s " 569 "does not accept raw " 570 "uid/gids. " 571 "Reenabling the idmapper.\n", 572 server->nfs_client->cl_hostname); 573 } 574 } 575 /* We failed to handle the error */ 576 return nfs4_map_errors(ret); 577 wait_on_recovery: 578 exception->recovering = 1; 579 return 0; 580 } 581 582 /* This is the error handling routine for processes that are allowed 583 * to sleep. 584 */ 585 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 586 { 587 struct nfs_client *clp = server->nfs_client; 588 int ret; 589 590 ret = nfs4_do_handle_exception(server, errorcode, exception); 591 if (exception->delay) { 592 ret = nfs4_delay(&exception->timeout, 593 exception->interruptible); 594 goto out_retry; 595 } 596 if (exception->recovering) { 597 if (exception->task_is_privileged) 598 return -EDEADLOCK; 599 ret = nfs4_wait_clnt_recover(clp); 600 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 601 return -EIO; 602 goto out_retry; 603 } 604 return ret; 605 out_retry: 606 if (ret == 0) 607 exception->retry = 1; 608 return ret; 609 } 610 611 static int 612 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 613 int errorcode, struct nfs4_exception *exception) 614 { 615 struct nfs_client *clp = server->nfs_client; 616 int ret; 617 618 ret = nfs4_do_handle_exception(server, errorcode, exception); 619 if (exception->delay) { 620 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 621 goto out_retry; 622 } 623 if (exception->recovering) { 624 if (exception->task_is_privileged) 625 return -EDEADLOCK; 626 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 627 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 628 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 629 goto out_retry; 630 } 631 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 632 ret = -EIO; 633 return ret; 634 out_retry: 635 if (ret == 0) { 636 exception->retry = 1; 637 /* 638 * For NFS4ERR_MOVED, the client transport will need to 639 * be recomputed after migration recovery has completed. 640 */ 641 if (errorcode == -NFS4ERR_MOVED) 642 rpc_task_release_transport(task); 643 } 644 return ret; 645 } 646 647 int 648 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 649 struct nfs4_state *state, long *timeout) 650 { 651 struct nfs4_exception exception = { 652 .state = state, 653 }; 654 655 if (task->tk_status >= 0) 656 return 0; 657 if (timeout) 658 exception.timeout = *timeout; 659 task->tk_status = nfs4_async_handle_exception(task, server, 660 task->tk_status, 661 &exception); 662 if (exception.delay && timeout) 663 *timeout = exception.timeout; 664 if (exception.retry) 665 return -EAGAIN; 666 return 0; 667 } 668 669 /* 670 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 671 * or 'false' otherwise. 672 */ 673 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 674 { 675 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 676 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 677 } 678 679 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 680 { 681 spin_lock(&clp->cl_lock); 682 if (time_before(clp->cl_last_renewal,timestamp)) 683 clp->cl_last_renewal = timestamp; 684 spin_unlock(&clp->cl_lock); 685 } 686 687 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 688 { 689 struct nfs_client *clp = server->nfs_client; 690 691 if (!nfs4_has_session(clp)) 692 do_renew_lease(clp, timestamp); 693 } 694 695 struct nfs4_call_sync_data { 696 const struct nfs_server *seq_server; 697 struct nfs4_sequence_args *seq_args; 698 struct nfs4_sequence_res *seq_res; 699 }; 700 701 void nfs4_init_sequence(struct nfs4_sequence_args *args, 702 struct nfs4_sequence_res *res, int cache_reply, 703 int privileged) 704 { 705 args->sa_slot = NULL; 706 args->sa_cache_this = cache_reply; 707 args->sa_privileged = privileged; 708 709 res->sr_slot = NULL; 710 } 711 712 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 713 { 714 struct nfs4_slot *slot = res->sr_slot; 715 struct nfs4_slot_table *tbl; 716 717 tbl = slot->table; 718 spin_lock(&tbl->slot_tbl_lock); 719 if (!nfs41_wake_and_assign_slot(tbl, slot)) 720 nfs4_free_slot(tbl, slot); 721 spin_unlock(&tbl->slot_tbl_lock); 722 723 res->sr_slot = NULL; 724 } 725 726 static int nfs40_sequence_done(struct rpc_task *task, 727 struct nfs4_sequence_res *res) 728 { 729 if (res->sr_slot != NULL) 730 nfs40_sequence_free_slot(res); 731 return 1; 732 } 733 734 #if defined(CONFIG_NFS_V4_1) 735 736 static void nfs41_release_slot(struct nfs4_slot *slot) 737 { 738 struct nfs4_session *session; 739 struct nfs4_slot_table *tbl; 740 bool send_new_highest_used_slotid = false; 741 742 if (!slot) 743 return; 744 tbl = slot->table; 745 session = tbl->session; 746 747 /* Bump the slot sequence number */ 748 if (slot->seq_done) 749 slot->seq_nr++; 750 slot->seq_done = 0; 751 752 spin_lock(&tbl->slot_tbl_lock); 753 /* Be nice to the server: try to ensure that the last transmitted 754 * value for highest_user_slotid <= target_highest_slotid 755 */ 756 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 757 send_new_highest_used_slotid = true; 758 759 if (nfs41_wake_and_assign_slot(tbl, slot)) { 760 send_new_highest_used_slotid = false; 761 goto out_unlock; 762 } 763 nfs4_free_slot(tbl, slot); 764 765 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 766 send_new_highest_used_slotid = false; 767 out_unlock: 768 spin_unlock(&tbl->slot_tbl_lock); 769 if (send_new_highest_used_slotid) 770 nfs41_notify_server(session->clp); 771 if (waitqueue_active(&tbl->slot_waitq)) 772 wake_up_all(&tbl->slot_waitq); 773 } 774 775 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 776 { 777 nfs41_release_slot(res->sr_slot); 778 res->sr_slot = NULL; 779 } 780 781 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 782 u32 seqnr) 783 { 784 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 785 slot->seq_nr_highest_sent = seqnr; 786 } 787 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 788 { 789 nfs4_slot_sequence_record_sent(slot, seqnr); 790 slot->seq_nr_last_acked = seqnr; 791 } 792 793 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 794 struct nfs4_slot *slot) 795 { 796 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 797 if (!IS_ERR(task)) 798 rpc_put_task_async(task); 799 } 800 801 static int nfs41_sequence_process(struct rpc_task *task, 802 struct nfs4_sequence_res *res) 803 { 804 struct nfs4_session *session; 805 struct nfs4_slot *slot = res->sr_slot; 806 struct nfs_client *clp; 807 int status; 808 int ret = 1; 809 810 if (slot == NULL) 811 goto out_noaction; 812 /* don't increment the sequence number if the task wasn't sent */ 813 if (!RPC_WAS_SENT(task) || slot->seq_done) 814 goto out; 815 816 session = slot->table->session; 817 clp = session->clp; 818 819 trace_nfs4_sequence_done(session, res); 820 821 status = res->sr_status; 822 if (task->tk_status == -NFS4ERR_DEADSESSION) 823 status = -NFS4ERR_DEADSESSION; 824 825 /* Check the SEQUENCE operation status */ 826 switch (status) { 827 case 0: 828 /* Mark this sequence number as having been acked */ 829 nfs4_slot_sequence_acked(slot, slot->seq_nr); 830 /* Update the slot's sequence and clientid lease timer */ 831 slot->seq_done = 1; 832 do_renew_lease(clp, res->sr_timestamp); 833 /* Check sequence flags */ 834 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 835 !!slot->privileged); 836 nfs41_update_target_slotid(slot->table, slot, res); 837 break; 838 case 1: 839 /* 840 * sr_status remains 1 if an RPC level error occurred. 841 * The server may or may not have processed the sequence 842 * operation.. 843 */ 844 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 845 slot->seq_done = 1; 846 goto out; 847 case -NFS4ERR_DELAY: 848 /* The server detected a resend of the RPC call and 849 * returned NFS4ERR_DELAY as per Section 2.10.6.2 850 * of RFC5661. 851 */ 852 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 853 __func__, 854 slot->slot_nr, 855 slot->seq_nr); 856 goto out_retry; 857 case -NFS4ERR_RETRY_UNCACHED_REP: 858 case -NFS4ERR_SEQ_FALSE_RETRY: 859 /* 860 * The server thinks we tried to replay a request. 861 * Retry the call after bumping the sequence ID. 862 */ 863 nfs4_slot_sequence_acked(slot, slot->seq_nr); 864 goto retry_new_seq; 865 case -NFS4ERR_BADSLOT: 866 /* 867 * The slot id we used was probably retired. Try again 868 * using a different slot id. 869 */ 870 if (slot->slot_nr < slot->table->target_highest_slotid) 871 goto session_recover; 872 goto retry_nowait; 873 case -NFS4ERR_SEQ_MISORDERED: 874 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 875 /* 876 * Were one or more calls using this slot interrupted? 877 * If the server never received the request, then our 878 * transmitted slot sequence number may be too high. However, 879 * if the server did receive the request then it might 880 * accidentally give us a reply with a mismatched operation. 881 * We can sort this out by sending a lone sequence operation 882 * to the server on the same slot. 883 */ 884 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 885 slot->seq_nr--; 886 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 887 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 888 res->sr_slot = NULL; 889 } 890 goto retry_nowait; 891 } 892 /* 893 * RFC5661: 894 * A retry might be sent while the original request is 895 * still in progress on the replier. The replier SHOULD 896 * deal with the issue by returning NFS4ERR_DELAY as the 897 * reply to SEQUENCE or CB_SEQUENCE operation, but 898 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 899 * 900 * Restart the search after a delay. 901 */ 902 slot->seq_nr = slot->seq_nr_highest_sent; 903 goto out_retry; 904 case -NFS4ERR_BADSESSION: 905 case -NFS4ERR_DEADSESSION: 906 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 907 goto session_recover; 908 default: 909 /* Just update the slot sequence no. */ 910 slot->seq_done = 1; 911 } 912 out: 913 /* The session may be reset by one of the error handlers. */ 914 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 915 out_noaction: 916 return ret; 917 session_recover: 918 nfs4_schedule_session_recovery(session, status); 919 dprintk("%s ERROR: %d Reset session\n", __func__, status); 920 nfs41_sequence_free_slot(res); 921 goto out; 922 retry_new_seq: 923 ++slot->seq_nr; 924 retry_nowait: 925 if (rpc_restart_call_prepare(task)) { 926 nfs41_sequence_free_slot(res); 927 task->tk_status = 0; 928 ret = 0; 929 } 930 goto out; 931 out_retry: 932 if (!rpc_restart_call(task)) 933 goto out; 934 rpc_delay(task, NFS4_POLL_RETRY_MAX); 935 return 0; 936 } 937 938 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 939 { 940 if (!nfs41_sequence_process(task, res)) 941 return 0; 942 if (res->sr_slot != NULL) 943 nfs41_sequence_free_slot(res); 944 return 1; 945 946 } 947 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 948 949 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 950 { 951 if (res->sr_slot == NULL) 952 return 1; 953 if (res->sr_slot->table->session != NULL) 954 return nfs41_sequence_process(task, res); 955 return nfs40_sequence_done(task, res); 956 } 957 958 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 959 { 960 if (res->sr_slot != NULL) { 961 if (res->sr_slot->table->session != NULL) 962 nfs41_sequence_free_slot(res); 963 else 964 nfs40_sequence_free_slot(res); 965 } 966 } 967 968 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 969 { 970 if (res->sr_slot == NULL) 971 return 1; 972 if (!res->sr_slot->table->session) 973 return nfs40_sequence_done(task, res); 974 return nfs41_sequence_done(task, res); 975 } 976 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 977 978 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 979 { 980 struct nfs4_call_sync_data *data = calldata; 981 982 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 983 984 nfs4_setup_sequence(data->seq_server->nfs_client, 985 data->seq_args, data->seq_res, task); 986 } 987 988 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 989 { 990 struct nfs4_call_sync_data *data = calldata; 991 992 nfs41_sequence_done(task, data->seq_res); 993 } 994 995 static const struct rpc_call_ops nfs41_call_sync_ops = { 996 .rpc_call_prepare = nfs41_call_sync_prepare, 997 .rpc_call_done = nfs41_call_sync_done, 998 }; 999 1000 #else /* !CONFIG_NFS_V4_1 */ 1001 1002 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1003 { 1004 return nfs40_sequence_done(task, res); 1005 } 1006 1007 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1008 { 1009 if (res->sr_slot != NULL) 1010 nfs40_sequence_free_slot(res); 1011 } 1012 1013 int nfs4_sequence_done(struct rpc_task *task, 1014 struct nfs4_sequence_res *res) 1015 { 1016 return nfs40_sequence_done(task, res); 1017 } 1018 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1019 1020 #endif /* !CONFIG_NFS_V4_1 */ 1021 1022 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1023 { 1024 res->sr_timestamp = jiffies; 1025 res->sr_status_flags = 0; 1026 res->sr_status = 1; 1027 } 1028 1029 static 1030 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1031 struct nfs4_sequence_res *res, 1032 struct nfs4_slot *slot) 1033 { 1034 if (!slot) 1035 return; 1036 slot->privileged = args->sa_privileged ? 1 : 0; 1037 args->sa_slot = slot; 1038 1039 res->sr_slot = slot; 1040 } 1041 1042 int nfs4_setup_sequence(struct nfs_client *client, 1043 struct nfs4_sequence_args *args, 1044 struct nfs4_sequence_res *res, 1045 struct rpc_task *task) 1046 { 1047 struct nfs4_session *session = nfs4_get_session(client); 1048 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1049 struct nfs4_slot *slot; 1050 1051 /* slot already allocated? */ 1052 if (res->sr_slot != NULL) 1053 goto out_start; 1054 1055 if (session) 1056 tbl = &session->fc_slot_table; 1057 1058 spin_lock(&tbl->slot_tbl_lock); 1059 /* The state manager will wait until the slot table is empty */ 1060 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1061 goto out_sleep; 1062 1063 slot = nfs4_alloc_slot(tbl); 1064 if (IS_ERR(slot)) { 1065 if (slot == ERR_PTR(-ENOMEM)) 1066 goto out_sleep_timeout; 1067 goto out_sleep; 1068 } 1069 spin_unlock(&tbl->slot_tbl_lock); 1070 1071 nfs4_sequence_attach_slot(args, res, slot); 1072 1073 trace_nfs4_setup_sequence(session, args); 1074 out_start: 1075 nfs41_sequence_res_init(res); 1076 rpc_call_start(task); 1077 return 0; 1078 out_sleep_timeout: 1079 /* Try again in 1/4 second */ 1080 if (args->sa_privileged) 1081 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1082 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1083 else 1084 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1085 NULL, jiffies + (HZ >> 2)); 1086 spin_unlock(&tbl->slot_tbl_lock); 1087 return -EAGAIN; 1088 out_sleep: 1089 if (args->sa_privileged) 1090 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1091 RPC_PRIORITY_PRIVILEGED); 1092 else 1093 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1094 spin_unlock(&tbl->slot_tbl_lock); 1095 return -EAGAIN; 1096 } 1097 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1098 1099 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1100 { 1101 struct nfs4_call_sync_data *data = calldata; 1102 nfs4_setup_sequence(data->seq_server->nfs_client, 1103 data->seq_args, data->seq_res, task); 1104 } 1105 1106 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1107 { 1108 struct nfs4_call_sync_data *data = calldata; 1109 nfs4_sequence_done(task, data->seq_res); 1110 } 1111 1112 static const struct rpc_call_ops nfs40_call_sync_ops = { 1113 .rpc_call_prepare = nfs40_call_sync_prepare, 1114 .rpc_call_done = nfs40_call_sync_done, 1115 }; 1116 1117 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1118 { 1119 int ret; 1120 struct rpc_task *task; 1121 1122 task = rpc_run_task(task_setup); 1123 if (IS_ERR(task)) 1124 return PTR_ERR(task); 1125 1126 ret = task->tk_status; 1127 rpc_put_task(task); 1128 return ret; 1129 } 1130 1131 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1132 struct nfs_server *server, 1133 struct rpc_message *msg, 1134 struct nfs4_sequence_args *args, 1135 struct nfs4_sequence_res *res, 1136 unsigned short task_flags) 1137 { 1138 struct nfs_client *clp = server->nfs_client; 1139 struct nfs4_call_sync_data data = { 1140 .seq_server = server, 1141 .seq_args = args, 1142 .seq_res = res, 1143 }; 1144 struct rpc_task_setup task_setup = { 1145 .rpc_client = clnt, 1146 .rpc_message = msg, 1147 .callback_ops = clp->cl_mvops->call_sync_ops, 1148 .callback_data = &data, 1149 .flags = task_flags, 1150 }; 1151 1152 return nfs4_call_sync_custom(&task_setup); 1153 } 1154 1155 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1156 struct nfs_server *server, 1157 struct rpc_message *msg, 1158 struct nfs4_sequence_args *args, 1159 struct nfs4_sequence_res *res) 1160 { 1161 unsigned short task_flags = 0; 1162 1163 if (server->caps & NFS_CAP_MOVEABLE) 1164 task_flags = RPC_TASK_MOVEABLE; 1165 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1166 } 1167 1168 1169 int nfs4_call_sync(struct rpc_clnt *clnt, 1170 struct nfs_server *server, 1171 struct rpc_message *msg, 1172 struct nfs4_sequence_args *args, 1173 struct nfs4_sequence_res *res, 1174 int cache_reply) 1175 { 1176 nfs4_init_sequence(args, res, cache_reply, 0); 1177 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1178 } 1179 1180 static void 1181 nfs4_inc_nlink_locked(struct inode *inode) 1182 { 1183 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1184 NFS_INO_INVALID_CTIME | 1185 NFS_INO_INVALID_NLINK); 1186 inc_nlink(inode); 1187 } 1188 1189 static void 1190 nfs4_inc_nlink(struct inode *inode) 1191 { 1192 spin_lock(&inode->i_lock); 1193 nfs4_inc_nlink_locked(inode); 1194 spin_unlock(&inode->i_lock); 1195 } 1196 1197 static void 1198 nfs4_dec_nlink_locked(struct inode *inode) 1199 { 1200 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1201 NFS_INO_INVALID_CTIME | 1202 NFS_INO_INVALID_NLINK); 1203 drop_nlink(inode); 1204 } 1205 1206 static void 1207 nfs4_update_changeattr_locked(struct inode *inode, 1208 struct nfs4_change_info *cinfo, 1209 unsigned long timestamp, unsigned long cache_validity) 1210 { 1211 struct nfs_inode *nfsi = NFS_I(inode); 1212 u64 change_attr = inode_peek_iversion_raw(inode); 1213 1214 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1215 if (S_ISDIR(inode->i_mode)) 1216 cache_validity |= NFS_INO_INVALID_DATA; 1217 1218 switch (NFS_SERVER(inode)->change_attr_type) { 1219 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1220 if (cinfo->after == change_attr) 1221 goto out; 1222 break; 1223 default: 1224 if ((s64)(change_attr - cinfo->after) >= 0) 1225 goto out; 1226 } 1227 1228 inode_set_iversion_raw(inode, cinfo->after); 1229 if (!cinfo->atomic || cinfo->before != change_attr) { 1230 if (S_ISDIR(inode->i_mode)) 1231 nfs_force_lookup_revalidate(inode); 1232 1233 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1234 cache_validity |= 1235 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1236 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1237 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1238 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1239 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1240 } 1241 nfsi->attrtimeo_timestamp = jiffies; 1242 nfsi->read_cache_jiffies = timestamp; 1243 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1244 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1245 out: 1246 nfs_set_cache_invalid(inode, cache_validity); 1247 } 1248 1249 void 1250 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1251 unsigned long timestamp, unsigned long cache_validity) 1252 { 1253 spin_lock(&dir->i_lock); 1254 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1255 spin_unlock(&dir->i_lock); 1256 } 1257 1258 struct nfs4_open_createattrs { 1259 struct nfs4_label *label; 1260 struct iattr *sattr; 1261 const __u32 verf[2]; 1262 }; 1263 1264 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1265 int err, struct nfs4_exception *exception) 1266 { 1267 if (err != -EINVAL) 1268 return false; 1269 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1270 return false; 1271 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1272 exception->retry = 1; 1273 return true; 1274 } 1275 1276 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1277 { 1278 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1279 } 1280 1281 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1282 { 1283 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1284 1285 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1286 } 1287 1288 static u32 1289 nfs4_map_atomic_open_share(struct nfs_server *server, 1290 fmode_t fmode, int openflags) 1291 { 1292 u32 res = 0; 1293 1294 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1295 case FMODE_READ: 1296 res = NFS4_SHARE_ACCESS_READ; 1297 break; 1298 case FMODE_WRITE: 1299 res = NFS4_SHARE_ACCESS_WRITE; 1300 break; 1301 case FMODE_READ|FMODE_WRITE: 1302 res = NFS4_SHARE_ACCESS_BOTH; 1303 } 1304 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1305 goto out; 1306 /* Want no delegation if we're using O_DIRECT */ 1307 if (openflags & O_DIRECT) 1308 res |= NFS4_SHARE_WANT_NO_DELEG; 1309 out: 1310 return res; 1311 } 1312 1313 static enum open_claim_type4 1314 nfs4_map_atomic_open_claim(struct nfs_server *server, 1315 enum open_claim_type4 claim) 1316 { 1317 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1318 return claim; 1319 switch (claim) { 1320 default: 1321 return claim; 1322 case NFS4_OPEN_CLAIM_FH: 1323 return NFS4_OPEN_CLAIM_NULL; 1324 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1325 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1326 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1327 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1328 } 1329 } 1330 1331 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1332 { 1333 p->o_res.f_attr = &p->f_attr; 1334 p->o_res.seqid = p->o_arg.seqid; 1335 p->c_res.seqid = p->c_arg.seqid; 1336 p->o_res.server = p->o_arg.server; 1337 p->o_res.access_request = p->o_arg.access; 1338 nfs_fattr_init(&p->f_attr); 1339 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1340 } 1341 1342 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1343 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1344 const struct nfs4_open_createattrs *c, 1345 enum open_claim_type4 claim, 1346 gfp_t gfp_mask) 1347 { 1348 struct dentry *parent = dget_parent(dentry); 1349 struct inode *dir = d_inode(parent); 1350 struct nfs_server *server = NFS_SERVER(dir); 1351 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1352 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1353 struct nfs4_opendata *p; 1354 1355 p = kzalloc(sizeof(*p), gfp_mask); 1356 if (p == NULL) 1357 goto err; 1358 1359 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1360 if (IS_ERR(p->f_attr.label)) 1361 goto err_free_p; 1362 1363 p->a_label = nfs4_label_alloc(server, gfp_mask); 1364 if (IS_ERR(p->a_label)) 1365 goto err_free_f; 1366 1367 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1368 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1369 if (IS_ERR(p->o_arg.seqid)) 1370 goto err_free_label; 1371 nfs_sb_active(dentry->d_sb); 1372 p->dentry = dget(dentry); 1373 p->dir = parent; 1374 p->owner = sp; 1375 atomic_inc(&sp->so_count); 1376 p->o_arg.open_flags = flags; 1377 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1378 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1379 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1380 fmode, flags); 1381 if (flags & O_CREAT) { 1382 p->o_arg.umask = current_umask(); 1383 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1384 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1385 p->o_arg.u.attrs = &p->attrs; 1386 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1387 1388 memcpy(p->o_arg.u.verifier.data, c->verf, 1389 sizeof(p->o_arg.u.verifier.data)); 1390 } 1391 } 1392 /* ask server to check for all possible rights as results 1393 * are cached */ 1394 switch (p->o_arg.claim) { 1395 default: 1396 break; 1397 case NFS4_OPEN_CLAIM_NULL: 1398 case NFS4_OPEN_CLAIM_FH: 1399 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1400 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1401 NFS4_ACCESS_EXECUTE | 1402 nfs_access_xattr_mask(server); 1403 } 1404 p->o_arg.clientid = server->nfs_client->cl_clientid; 1405 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1406 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1407 p->o_arg.name = &dentry->d_name; 1408 p->o_arg.server = server; 1409 p->o_arg.bitmask = nfs4_bitmask(server, label); 1410 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1411 switch (p->o_arg.claim) { 1412 case NFS4_OPEN_CLAIM_NULL: 1413 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1414 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1415 p->o_arg.fh = NFS_FH(dir); 1416 break; 1417 case NFS4_OPEN_CLAIM_PREVIOUS: 1418 case NFS4_OPEN_CLAIM_FH: 1419 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1420 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1421 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1422 } 1423 p->c_arg.fh = &p->o_res.fh; 1424 p->c_arg.stateid = &p->o_res.stateid; 1425 p->c_arg.seqid = p->o_arg.seqid; 1426 nfs4_init_opendata_res(p); 1427 kref_init(&p->kref); 1428 return p; 1429 1430 err_free_label: 1431 nfs4_label_free(p->a_label); 1432 err_free_f: 1433 nfs4_label_free(p->f_attr.label); 1434 err_free_p: 1435 kfree(p); 1436 err: 1437 dput(parent); 1438 return NULL; 1439 } 1440 1441 static void nfs4_opendata_free(struct kref *kref) 1442 { 1443 struct nfs4_opendata *p = container_of(kref, 1444 struct nfs4_opendata, kref); 1445 struct super_block *sb = p->dentry->d_sb; 1446 1447 nfs4_lgopen_release(p->lgp); 1448 nfs_free_seqid(p->o_arg.seqid); 1449 nfs4_sequence_free_slot(&p->o_res.seq_res); 1450 if (p->state != NULL) 1451 nfs4_put_open_state(p->state); 1452 nfs4_put_state_owner(p->owner); 1453 1454 nfs4_label_free(p->a_label); 1455 nfs4_label_free(p->f_attr.label); 1456 1457 dput(p->dir); 1458 dput(p->dentry); 1459 nfs_sb_deactive(sb); 1460 nfs_fattr_free_names(&p->f_attr); 1461 kfree(p->f_attr.mdsthreshold); 1462 kfree(p); 1463 } 1464 1465 static void nfs4_opendata_put(struct nfs4_opendata *p) 1466 { 1467 if (p != NULL) 1468 kref_put(&p->kref, nfs4_opendata_free); 1469 } 1470 1471 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1472 fmode_t fmode) 1473 { 1474 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1475 case FMODE_READ|FMODE_WRITE: 1476 return state->n_rdwr != 0; 1477 case FMODE_WRITE: 1478 return state->n_wronly != 0; 1479 case FMODE_READ: 1480 return state->n_rdonly != 0; 1481 } 1482 WARN_ON_ONCE(1); 1483 return false; 1484 } 1485 1486 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1487 int open_mode, enum open_claim_type4 claim) 1488 { 1489 int ret = 0; 1490 1491 if (open_mode & (O_EXCL|O_TRUNC)) 1492 goto out; 1493 switch (claim) { 1494 case NFS4_OPEN_CLAIM_NULL: 1495 case NFS4_OPEN_CLAIM_FH: 1496 goto out; 1497 default: 1498 break; 1499 } 1500 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1501 case FMODE_READ: 1502 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1503 && state->n_rdonly != 0; 1504 break; 1505 case FMODE_WRITE: 1506 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1507 && state->n_wronly != 0; 1508 break; 1509 case FMODE_READ|FMODE_WRITE: 1510 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1511 && state->n_rdwr != 0; 1512 } 1513 out: 1514 return ret; 1515 } 1516 1517 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1518 enum open_claim_type4 claim) 1519 { 1520 if (delegation == NULL) 1521 return 0; 1522 if ((delegation->type & fmode) != fmode) 1523 return 0; 1524 switch (claim) { 1525 case NFS4_OPEN_CLAIM_NULL: 1526 case NFS4_OPEN_CLAIM_FH: 1527 break; 1528 case NFS4_OPEN_CLAIM_PREVIOUS: 1529 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1530 break; 1531 fallthrough; 1532 default: 1533 return 0; 1534 } 1535 nfs_mark_delegation_referenced(delegation); 1536 return 1; 1537 } 1538 1539 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1540 { 1541 switch (fmode) { 1542 case FMODE_WRITE: 1543 state->n_wronly++; 1544 break; 1545 case FMODE_READ: 1546 state->n_rdonly++; 1547 break; 1548 case FMODE_READ|FMODE_WRITE: 1549 state->n_rdwr++; 1550 } 1551 nfs4_state_set_mode_locked(state, state->state | fmode); 1552 } 1553 1554 #ifdef CONFIG_NFS_V4_1 1555 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1556 { 1557 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1558 return true; 1559 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1560 return true; 1561 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1562 return true; 1563 return false; 1564 } 1565 #endif /* CONFIG_NFS_V4_1 */ 1566 1567 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1568 { 1569 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1570 wake_up_all(&state->waitq); 1571 } 1572 1573 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1574 { 1575 struct nfs_client *clp = state->owner->so_server->nfs_client; 1576 bool need_recover = false; 1577 1578 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1579 need_recover = true; 1580 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1581 need_recover = true; 1582 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1583 need_recover = true; 1584 if (need_recover) 1585 nfs4_state_mark_reclaim_nograce(clp, state); 1586 } 1587 1588 /* 1589 * Check for whether or not the caller may update the open stateid 1590 * to the value passed in by stateid. 1591 * 1592 * Note: This function relies heavily on the server implementing 1593 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1594 * correctly. 1595 * i.e. The stateid seqids have to be initialised to 1, and 1596 * are then incremented on every state transition. 1597 */ 1598 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1599 const nfs4_stateid *stateid) 1600 { 1601 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1602 /* The common case - we're updating to a new sequence number */ 1603 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1604 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1605 return true; 1606 return false; 1607 } 1608 /* The server returned a new stateid */ 1609 } 1610 /* This is the first OPEN in this generation */ 1611 if (stateid->seqid == cpu_to_be32(1)) 1612 return true; 1613 return false; 1614 } 1615 1616 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1617 { 1618 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1619 return; 1620 if (state->n_wronly) 1621 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1622 if (state->n_rdonly) 1623 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1624 if (state->n_rdwr) 1625 set_bit(NFS_O_RDWR_STATE, &state->flags); 1626 set_bit(NFS_OPEN_STATE, &state->flags); 1627 } 1628 1629 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1630 nfs4_stateid *stateid, fmode_t fmode) 1631 { 1632 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1633 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1634 case FMODE_WRITE: 1635 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1636 break; 1637 case FMODE_READ: 1638 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1639 break; 1640 case 0: 1641 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1642 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1643 clear_bit(NFS_OPEN_STATE, &state->flags); 1644 } 1645 if (stateid == NULL) 1646 return; 1647 /* Handle OPEN+OPEN_DOWNGRADE races */ 1648 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1649 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1650 nfs_resync_open_stateid_locked(state); 1651 goto out; 1652 } 1653 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1654 nfs4_stateid_copy(&state->stateid, stateid); 1655 nfs4_stateid_copy(&state->open_stateid, stateid); 1656 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1657 out: 1658 nfs_state_log_update_open_stateid(state); 1659 } 1660 1661 static void nfs_clear_open_stateid(struct nfs4_state *state, 1662 nfs4_stateid *arg_stateid, 1663 nfs4_stateid *stateid, fmode_t fmode) 1664 { 1665 write_seqlock(&state->seqlock); 1666 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1667 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1668 nfs_clear_open_stateid_locked(state, stateid, fmode); 1669 write_sequnlock(&state->seqlock); 1670 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1671 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1672 } 1673 1674 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1675 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1676 __must_hold(&state->owner->so_lock) 1677 __must_hold(&state->seqlock) 1678 __must_hold(RCU) 1679 1680 { 1681 DEFINE_WAIT(wait); 1682 int status = 0; 1683 for (;;) { 1684 1685 if (nfs_stateid_is_sequential(state, stateid)) 1686 break; 1687 1688 if (status) 1689 break; 1690 /* Rely on seqids for serialisation with NFSv4.0 */ 1691 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1692 break; 1693 1694 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1695 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1696 /* 1697 * Ensure we process the state changes in the same order 1698 * in which the server processed them by delaying the 1699 * update of the stateid until we are in sequence. 1700 */ 1701 write_sequnlock(&state->seqlock); 1702 spin_unlock(&state->owner->so_lock); 1703 rcu_read_unlock(); 1704 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1705 1706 if (!fatal_signal_pending(current)) { 1707 if (schedule_timeout(5*HZ) == 0) 1708 status = -EAGAIN; 1709 else 1710 status = 0; 1711 } else 1712 status = -EINTR; 1713 finish_wait(&state->waitq, &wait); 1714 rcu_read_lock(); 1715 spin_lock(&state->owner->so_lock); 1716 write_seqlock(&state->seqlock); 1717 } 1718 1719 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1720 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1721 nfs4_stateid_copy(freeme, &state->open_stateid); 1722 nfs_test_and_clear_all_open_stateid(state); 1723 } 1724 1725 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1726 nfs4_stateid_copy(&state->stateid, stateid); 1727 nfs4_stateid_copy(&state->open_stateid, stateid); 1728 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1729 nfs_state_log_update_open_stateid(state); 1730 } 1731 1732 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1733 const nfs4_stateid *open_stateid, 1734 fmode_t fmode, 1735 nfs4_stateid *freeme) 1736 { 1737 /* 1738 * Protect the call to nfs4_state_set_mode_locked and 1739 * serialise the stateid update 1740 */ 1741 write_seqlock(&state->seqlock); 1742 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1743 switch (fmode) { 1744 case FMODE_READ: 1745 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1746 break; 1747 case FMODE_WRITE: 1748 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1749 break; 1750 case FMODE_READ|FMODE_WRITE: 1751 set_bit(NFS_O_RDWR_STATE, &state->flags); 1752 } 1753 set_bit(NFS_OPEN_STATE, &state->flags); 1754 write_sequnlock(&state->seqlock); 1755 } 1756 1757 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1758 { 1759 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1760 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1761 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1762 clear_bit(NFS_OPEN_STATE, &state->flags); 1763 } 1764 1765 static void nfs_state_set_delegation(struct nfs4_state *state, 1766 const nfs4_stateid *deleg_stateid, 1767 fmode_t fmode) 1768 { 1769 /* 1770 * Protect the call to nfs4_state_set_mode_locked and 1771 * serialise the stateid update 1772 */ 1773 write_seqlock(&state->seqlock); 1774 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1775 set_bit(NFS_DELEGATED_STATE, &state->flags); 1776 write_sequnlock(&state->seqlock); 1777 } 1778 1779 static void nfs_state_clear_delegation(struct nfs4_state *state) 1780 { 1781 write_seqlock(&state->seqlock); 1782 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1783 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1784 write_sequnlock(&state->seqlock); 1785 } 1786 1787 int update_open_stateid(struct nfs4_state *state, 1788 const nfs4_stateid *open_stateid, 1789 const nfs4_stateid *delegation, 1790 fmode_t fmode) 1791 { 1792 struct nfs_server *server = NFS_SERVER(state->inode); 1793 struct nfs_client *clp = server->nfs_client; 1794 struct nfs_inode *nfsi = NFS_I(state->inode); 1795 struct nfs_delegation *deleg_cur; 1796 nfs4_stateid freeme = { }; 1797 int ret = 0; 1798 1799 fmode &= (FMODE_READ|FMODE_WRITE); 1800 1801 rcu_read_lock(); 1802 spin_lock(&state->owner->so_lock); 1803 if (open_stateid != NULL) { 1804 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1805 ret = 1; 1806 } 1807 1808 deleg_cur = nfs4_get_valid_delegation(state->inode); 1809 if (deleg_cur == NULL) 1810 goto no_delegation; 1811 1812 spin_lock(&deleg_cur->lock); 1813 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1814 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1815 (deleg_cur->type & fmode) != fmode) 1816 goto no_delegation_unlock; 1817 1818 if (delegation == NULL) 1819 delegation = &deleg_cur->stateid; 1820 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1821 goto no_delegation_unlock; 1822 1823 nfs_mark_delegation_referenced(deleg_cur); 1824 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1825 ret = 1; 1826 no_delegation_unlock: 1827 spin_unlock(&deleg_cur->lock); 1828 no_delegation: 1829 if (ret) 1830 update_open_stateflags(state, fmode); 1831 spin_unlock(&state->owner->so_lock); 1832 rcu_read_unlock(); 1833 1834 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1835 nfs4_schedule_state_manager(clp); 1836 if (freeme.type != 0) 1837 nfs4_test_and_free_stateid(server, &freeme, 1838 state->owner->so_cred); 1839 1840 return ret; 1841 } 1842 1843 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1844 const nfs4_stateid *stateid) 1845 { 1846 struct nfs4_state *state = lsp->ls_state; 1847 bool ret = false; 1848 1849 spin_lock(&state->state_lock); 1850 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1851 goto out_noupdate; 1852 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1853 goto out_noupdate; 1854 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1855 ret = true; 1856 out_noupdate: 1857 spin_unlock(&state->state_lock); 1858 return ret; 1859 } 1860 1861 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1862 { 1863 struct nfs_delegation *delegation; 1864 1865 fmode &= FMODE_READ|FMODE_WRITE; 1866 rcu_read_lock(); 1867 delegation = nfs4_get_valid_delegation(inode); 1868 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1869 rcu_read_unlock(); 1870 return; 1871 } 1872 rcu_read_unlock(); 1873 nfs4_inode_return_delegation(inode); 1874 } 1875 1876 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1877 { 1878 struct nfs4_state *state = opendata->state; 1879 struct nfs_delegation *delegation; 1880 int open_mode = opendata->o_arg.open_flags; 1881 fmode_t fmode = opendata->o_arg.fmode; 1882 enum open_claim_type4 claim = opendata->o_arg.claim; 1883 nfs4_stateid stateid; 1884 int ret = -EAGAIN; 1885 1886 for (;;) { 1887 spin_lock(&state->owner->so_lock); 1888 if (can_open_cached(state, fmode, open_mode, claim)) { 1889 update_open_stateflags(state, fmode); 1890 spin_unlock(&state->owner->so_lock); 1891 goto out_return_state; 1892 } 1893 spin_unlock(&state->owner->so_lock); 1894 rcu_read_lock(); 1895 delegation = nfs4_get_valid_delegation(state->inode); 1896 if (!can_open_delegated(delegation, fmode, claim)) { 1897 rcu_read_unlock(); 1898 break; 1899 } 1900 /* Save the delegation */ 1901 nfs4_stateid_copy(&stateid, &delegation->stateid); 1902 rcu_read_unlock(); 1903 nfs_release_seqid(opendata->o_arg.seqid); 1904 if (!opendata->is_recover) { 1905 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1906 if (ret != 0) 1907 goto out; 1908 } 1909 ret = -EAGAIN; 1910 1911 /* Try to update the stateid using the delegation */ 1912 if (update_open_stateid(state, NULL, &stateid, fmode)) 1913 goto out_return_state; 1914 } 1915 out: 1916 return ERR_PTR(ret); 1917 out_return_state: 1918 refcount_inc(&state->count); 1919 return state; 1920 } 1921 1922 static void 1923 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1924 { 1925 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1926 struct nfs_delegation *delegation; 1927 int delegation_flags = 0; 1928 1929 rcu_read_lock(); 1930 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1931 if (delegation) 1932 delegation_flags = delegation->flags; 1933 rcu_read_unlock(); 1934 switch (data->o_arg.claim) { 1935 default: 1936 break; 1937 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1938 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1939 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1940 "returning a delegation for " 1941 "OPEN(CLAIM_DELEGATE_CUR)\n", 1942 clp->cl_hostname); 1943 return; 1944 } 1945 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1946 nfs_inode_set_delegation(state->inode, 1947 data->owner->so_cred, 1948 data->o_res.delegation_type, 1949 &data->o_res.delegation, 1950 data->o_res.pagemod_limit); 1951 else 1952 nfs_inode_reclaim_delegation(state->inode, 1953 data->owner->so_cred, 1954 data->o_res.delegation_type, 1955 &data->o_res.delegation, 1956 data->o_res.pagemod_limit); 1957 1958 if (data->o_res.do_recall) 1959 nfs_async_inode_return_delegation(state->inode, 1960 &data->o_res.delegation); 1961 } 1962 1963 /* 1964 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1965 * and update the nfs4_state. 1966 */ 1967 static struct nfs4_state * 1968 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1969 { 1970 struct inode *inode = data->state->inode; 1971 struct nfs4_state *state = data->state; 1972 int ret; 1973 1974 if (!data->rpc_done) { 1975 if (data->rpc_status) 1976 return ERR_PTR(data->rpc_status); 1977 /* cached opens have already been processed */ 1978 goto update; 1979 } 1980 1981 ret = nfs_refresh_inode(inode, &data->f_attr); 1982 if (ret) 1983 return ERR_PTR(ret); 1984 1985 if (data->o_res.delegation_type != 0) 1986 nfs4_opendata_check_deleg(data, state); 1987 update: 1988 if (!update_open_stateid(state, &data->o_res.stateid, 1989 NULL, data->o_arg.fmode)) 1990 return ERR_PTR(-EAGAIN); 1991 refcount_inc(&state->count); 1992 1993 return state; 1994 } 1995 1996 static struct inode * 1997 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1998 { 1999 struct inode *inode; 2000 2001 switch (data->o_arg.claim) { 2002 case NFS4_OPEN_CLAIM_NULL: 2003 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2004 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2005 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2006 return ERR_PTR(-EAGAIN); 2007 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2008 &data->f_attr); 2009 break; 2010 default: 2011 inode = d_inode(data->dentry); 2012 ihold(inode); 2013 nfs_refresh_inode(inode, &data->f_attr); 2014 } 2015 return inode; 2016 } 2017 2018 static struct nfs4_state * 2019 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2020 { 2021 struct nfs4_state *state; 2022 struct inode *inode; 2023 2024 inode = nfs4_opendata_get_inode(data); 2025 if (IS_ERR(inode)) 2026 return ERR_CAST(inode); 2027 if (data->state != NULL && data->state->inode == inode) { 2028 state = data->state; 2029 refcount_inc(&state->count); 2030 } else 2031 state = nfs4_get_open_state(inode, data->owner); 2032 iput(inode); 2033 if (state == NULL) 2034 state = ERR_PTR(-ENOMEM); 2035 return state; 2036 } 2037 2038 static struct nfs4_state * 2039 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2040 { 2041 struct nfs4_state *state; 2042 2043 if (!data->rpc_done) { 2044 state = nfs4_try_open_cached(data); 2045 trace_nfs4_cached_open(data->state); 2046 goto out; 2047 } 2048 2049 state = nfs4_opendata_find_nfs4_state(data); 2050 if (IS_ERR(state)) 2051 goto out; 2052 2053 if (data->o_res.delegation_type != 0) 2054 nfs4_opendata_check_deleg(data, state); 2055 if (!update_open_stateid(state, &data->o_res.stateid, 2056 NULL, data->o_arg.fmode)) { 2057 nfs4_put_open_state(state); 2058 state = ERR_PTR(-EAGAIN); 2059 } 2060 out: 2061 nfs_release_seqid(data->o_arg.seqid); 2062 return state; 2063 } 2064 2065 static struct nfs4_state * 2066 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2067 { 2068 struct nfs4_state *ret; 2069 2070 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2071 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2072 else 2073 ret = _nfs4_opendata_to_nfs4_state(data); 2074 nfs4_sequence_free_slot(&data->o_res.seq_res); 2075 return ret; 2076 } 2077 2078 static struct nfs_open_context * 2079 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2080 { 2081 struct nfs_inode *nfsi = NFS_I(state->inode); 2082 struct nfs_open_context *ctx; 2083 2084 rcu_read_lock(); 2085 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2086 if (ctx->state != state) 2087 continue; 2088 if ((ctx->mode & mode) != mode) 2089 continue; 2090 if (!get_nfs_open_context(ctx)) 2091 continue; 2092 rcu_read_unlock(); 2093 return ctx; 2094 } 2095 rcu_read_unlock(); 2096 return ERR_PTR(-ENOENT); 2097 } 2098 2099 static struct nfs_open_context * 2100 nfs4_state_find_open_context(struct nfs4_state *state) 2101 { 2102 struct nfs_open_context *ctx; 2103 2104 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2105 if (!IS_ERR(ctx)) 2106 return ctx; 2107 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2108 if (!IS_ERR(ctx)) 2109 return ctx; 2110 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2111 } 2112 2113 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2114 struct nfs4_state *state, enum open_claim_type4 claim) 2115 { 2116 struct nfs4_opendata *opendata; 2117 2118 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2119 NULL, claim, GFP_NOFS); 2120 if (opendata == NULL) 2121 return ERR_PTR(-ENOMEM); 2122 opendata->state = state; 2123 refcount_inc(&state->count); 2124 return opendata; 2125 } 2126 2127 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2128 fmode_t fmode) 2129 { 2130 struct nfs4_state *newstate; 2131 int ret; 2132 2133 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2134 return 0; 2135 opendata->o_arg.open_flags = 0; 2136 opendata->o_arg.fmode = fmode; 2137 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 2138 NFS_SB(opendata->dentry->d_sb), 2139 fmode, 0); 2140 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2141 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2142 nfs4_init_opendata_res(opendata); 2143 ret = _nfs4_recover_proc_open(opendata); 2144 if (ret != 0) 2145 return ret; 2146 newstate = nfs4_opendata_to_nfs4_state(opendata); 2147 if (IS_ERR(newstate)) 2148 return PTR_ERR(newstate); 2149 if (newstate != opendata->state) 2150 ret = -ESTALE; 2151 nfs4_close_state(newstate, fmode); 2152 return ret; 2153 } 2154 2155 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2156 { 2157 int ret; 2158 2159 /* memory barrier prior to reading state->n_* */ 2160 smp_rmb(); 2161 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2162 if (ret != 0) 2163 return ret; 2164 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2165 if (ret != 0) 2166 return ret; 2167 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2168 if (ret != 0) 2169 return ret; 2170 /* 2171 * We may have performed cached opens for all three recoveries. 2172 * Check if we need to update the current stateid. 2173 */ 2174 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2175 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2176 write_seqlock(&state->seqlock); 2177 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2178 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2179 write_sequnlock(&state->seqlock); 2180 } 2181 return 0; 2182 } 2183 2184 /* 2185 * OPEN_RECLAIM: 2186 * reclaim state on the server after a reboot. 2187 */ 2188 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2189 { 2190 struct nfs_delegation *delegation; 2191 struct nfs4_opendata *opendata; 2192 fmode_t delegation_type = 0; 2193 int status; 2194 2195 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2196 NFS4_OPEN_CLAIM_PREVIOUS); 2197 if (IS_ERR(opendata)) 2198 return PTR_ERR(opendata); 2199 rcu_read_lock(); 2200 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2201 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2202 delegation_type = delegation->type; 2203 rcu_read_unlock(); 2204 opendata->o_arg.u.delegation_type = delegation_type; 2205 status = nfs4_open_recover(opendata, state); 2206 nfs4_opendata_put(opendata); 2207 return status; 2208 } 2209 2210 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2211 { 2212 struct nfs_server *server = NFS_SERVER(state->inode); 2213 struct nfs4_exception exception = { }; 2214 int err; 2215 do { 2216 err = _nfs4_do_open_reclaim(ctx, state); 2217 trace_nfs4_open_reclaim(ctx, 0, err); 2218 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2219 continue; 2220 if (err != -NFS4ERR_DELAY) 2221 break; 2222 nfs4_handle_exception(server, err, &exception); 2223 } while (exception.retry); 2224 return err; 2225 } 2226 2227 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2228 { 2229 struct nfs_open_context *ctx; 2230 int ret; 2231 2232 ctx = nfs4_state_find_open_context(state); 2233 if (IS_ERR(ctx)) 2234 return -EAGAIN; 2235 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2236 nfs_state_clear_open_state_flags(state); 2237 ret = nfs4_do_open_reclaim(ctx, state); 2238 put_nfs_open_context(ctx); 2239 return ret; 2240 } 2241 2242 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) 2243 { 2244 switch (err) { 2245 default: 2246 printk(KERN_ERR "NFS: %s: unhandled error " 2247 "%d.\n", __func__, err); 2248 fallthrough; 2249 case 0: 2250 case -ENOENT: 2251 case -EAGAIN: 2252 case -ESTALE: 2253 case -ETIMEDOUT: 2254 break; 2255 case -NFS4ERR_BADSESSION: 2256 case -NFS4ERR_BADSLOT: 2257 case -NFS4ERR_BAD_HIGH_SLOT: 2258 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2259 case -NFS4ERR_DEADSESSION: 2260 return -EAGAIN; 2261 case -NFS4ERR_STALE_CLIENTID: 2262 case -NFS4ERR_STALE_STATEID: 2263 /* Don't recall a delegation if it was lost */ 2264 nfs4_schedule_lease_recovery(server->nfs_client); 2265 return -EAGAIN; 2266 case -NFS4ERR_MOVED: 2267 nfs4_schedule_migration_recovery(server); 2268 return -EAGAIN; 2269 case -NFS4ERR_LEASE_MOVED: 2270 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2271 return -EAGAIN; 2272 case -NFS4ERR_DELEG_REVOKED: 2273 case -NFS4ERR_ADMIN_REVOKED: 2274 case -NFS4ERR_EXPIRED: 2275 case -NFS4ERR_BAD_STATEID: 2276 case -NFS4ERR_OPENMODE: 2277 nfs_inode_find_state_and_recover(state->inode, 2278 stateid); 2279 nfs4_schedule_stateid_recovery(server, state); 2280 return -EAGAIN; 2281 case -NFS4ERR_DELAY: 2282 case -NFS4ERR_GRACE: 2283 ssleep(1); 2284 return -EAGAIN; 2285 case -ENOMEM: 2286 case -NFS4ERR_DENIED: 2287 if (fl) { 2288 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2289 if (lsp) 2290 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2291 } 2292 return 0; 2293 } 2294 return err; 2295 } 2296 2297 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2298 struct nfs4_state *state, const nfs4_stateid *stateid) 2299 { 2300 struct nfs_server *server = NFS_SERVER(state->inode); 2301 struct nfs4_opendata *opendata; 2302 int err = 0; 2303 2304 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2305 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2306 if (IS_ERR(opendata)) 2307 return PTR_ERR(opendata); 2308 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2309 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2310 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2311 if (err) 2312 goto out; 2313 } 2314 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2315 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2316 if (err) 2317 goto out; 2318 } 2319 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2320 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2321 if (err) 2322 goto out; 2323 } 2324 nfs_state_clear_delegation(state); 2325 out: 2326 nfs4_opendata_put(opendata); 2327 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2328 } 2329 2330 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2331 { 2332 struct nfs4_opendata *data = calldata; 2333 2334 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2335 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2336 } 2337 2338 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2339 { 2340 struct nfs4_opendata *data = calldata; 2341 2342 nfs40_sequence_done(task, &data->c_res.seq_res); 2343 2344 data->rpc_status = task->tk_status; 2345 if (data->rpc_status == 0) { 2346 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2347 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2348 renew_lease(data->o_res.server, data->timestamp); 2349 data->rpc_done = true; 2350 } 2351 } 2352 2353 static void nfs4_open_confirm_release(void *calldata) 2354 { 2355 struct nfs4_opendata *data = calldata; 2356 struct nfs4_state *state = NULL; 2357 2358 /* If this request hasn't been cancelled, do nothing */ 2359 if (!data->cancelled) 2360 goto out_free; 2361 /* In case of error, no cleanup! */ 2362 if (!data->rpc_done) 2363 goto out_free; 2364 state = nfs4_opendata_to_nfs4_state(data); 2365 if (!IS_ERR(state)) 2366 nfs4_close_state(state, data->o_arg.fmode); 2367 out_free: 2368 nfs4_opendata_put(data); 2369 } 2370 2371 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2372 .rpc_call_prepare = nfs4_open_confirm_prepare, 2373 .rpc_call_done = nfs4_open_confirm_done, 2374 .rpc_release = nfs4_open_confirm_release, 2375 }; 2376 2377 /* 2378 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2379 */ 2380 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2381 { 2382 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2383 struct rpc_task *task; 2384 struct rpc_message msg = { 2385 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2386 .rpc_argp = &data->c_arg, 2387 .rpc_resp = &data->c_res, 2388 .rpc_cred = data->owner->so_cred, 2389 }; 2390 struct rpc_task_setup task_setup_data = { 2391 .rpc_client = server->client, 2392 .rpc_message = &msg, 2393 .callback_ops = &nfs4_open_confirm_ops, 2394 .callback_data = data, 2395 .workqueue = nfsiod_workqueue, 2396 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2397 }; 2398 int status; 2399 2400 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2401 data->is_recover); 2402 kref_get(&data->kref); 2403 data->rpc_done = false; 2404 data->rpc_status = 0; 2405 data->timestamp = jiffies; 2406 task = rpc_run_task(&task_setup_data); 2407 if (IS_ERR(task)) 2408 return PTR_ERR(task); 2409 status = rpc_wait_for_completion_task(task); 2410 if (status != 0) { 2411 data->cancelled = true; 2412 smp_wmb(); 2413 } else 2414 status = data->rpc_status; 2415 rpc_put_task(task); 2416 return status; 2417 } 2418 2419 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2420 { 2421 struct nfs4_opendata *data = calldata; 2422 struct nfs4_state_owner *sp = data->owner; 2423 struct nfs_client *clp = sp->so_server->nfs_client; 2424 enum open_claim_type4 claim = data->o_arg.claim; 2425 2426 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2427 goto out_wait; 2428 /* 2429 * Check if we still need to send an OPEN call, or if we can use 2430 * a delegation instead. 2431 */ 2432 if (data->state != NULL) { 2433 struct nfs_delegation *delegation; 2434 2435 if (can_open_cached(data->state, data->o_arg.fmode, 2436 data->o_arg.open_flags, claim)) 2437 goto out_no_action; 2438 rcu_read_lock(); 2439 delegation = nfs4_get_valid_delegation(data->state->inode); 2440 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2441 goto unlock_no_action; 2442 rcu_read_unlock(); 2443 } 2444 /* Update client id. */ 2445 data->o_arg.clientid = clp->cl_clientid; 2446 switch (claim) { 2447 default: 2448 break; 2449 case NFS4_OPEN_CLAIM_PREVIOUS: 2450 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2451 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2452 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2453 fallthrough; 2454 case NFS4_OPEN_CLAIM_FH: 2455 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2456 } 2457 data->timestamp = jiffies; 2458 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2459 &data->o_arg.seq_args, 2460 &data->o_res.seq_res, 2461 task) != 0) 2462 nfs_release_seqid(data->o_arg.seqid); 2463 2464 /* Set the create mode (note dependency on the session type) */ 2465 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2466 if (data->o_arg.open_flags & O_EXCL) { 2467 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2468 if (clp->cl_mvops->minor_version == 0) { 2469 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2470 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2471 * because ACCESS will return permission denied for 2472 * all bits until close */ 2473 data->o_res.access_request = data->o_arg.access = 0; 2474 } else if (nfs4_has_persistent_session(clp)) 2475 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2476 } 2477 return; 2478 unlock_no_action: 2479 trace_nfs4_cached_open(data->state); 2480 rcu_read_unlock(); 2481 out_no_action: 2482 task->tk_action = NULL; 2483 out_wait: 2484 nfs4_sequence_done(task, &data->o_res.seq_res); 2485 } 2486 2487 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2488 { 2489 struct nfs4_opendata *data = calldata; 2490 2491 data->rpc_status = task->tk_status; 2492 2493 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2494 return; 2495 2496 if (task->tk_status == 0) { 2497 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2498 switch (data->o_res.f_attr->mode & S_IFMT) { 2499 case S_IFREG: 2500 break; 2501 case S_IFLNK: 2502 data->rpc_status = -ELOOP; 2503 break; 2504 case S_IFDIR: 2505 data->rpc_status = -EISDIR; 2506 break; 2507 default: 2508 data->rpc_status = -ENOTDIR; 2509 } 2510 } 2511 renew_lease(data->o_res.server, data->timestamp); 2512 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2513 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2514 } 2515 data->rpc_done = true; 2516 } 2517 2518 static void nfs4_open_release(void *calldata) 2519 { 2520 struct nfs4_opendata *data = calldata; 2521 struct nfs4_state *state = NULL; 2522 2523 /* If this request hasn't been cancelled, do nothing */ 2524 if (!data->cancelled) 2525 goto out_free; 2526 /* In case of error, no cleanup! */ 2527 if (data->rpc_status != 0 || !data->rpc_done) 2528 goto out_free; 2529 /* In case we need an open_confirm, no cleanup! */ 2530 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2531 goto out_free; 2532 state = nfs4_opendata_to_nfs4_state(data); 2533 if (!IS_ERR(state)) 2534 nfs4_close_state(state, data->o_arg.fmode); 2535 out_free: 2536 nfs4_opendata_put(data); 2537 } 2538 2539 static const struct rpc_call_ops nfs4_open_ops = { 2540 .rpc_call_prepare = nfs4_open_prepare, 2541 .rpc_call_done = nfs4_open_done, 2542 .rpc_release = nfs4_open_release, 2543 }; 2544 2545 static int nfs4_run_open_task(struct nfs4_opendata *data, 2546 struct nfs_open_context *ctx) 2547 { 2548 struct inode *dir = d_inode(data->dir); 2549 struct nfs_server *server = NFS_SERVER(dir); 2550 struct nfs_openargs *o_arg = &data->o_arg; 2551 struct nfs_openres *o_res = &data->o_res; 2552 struct rpc_task *task; 2553 struct rpc_message msg = { 2554 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2555 .rpc_argp = o_arg, 2556 .rpc_resp = o_res, 2557 .rpc_cred = data->owner->so_cred, 2558 }; 2559 struct rpc_task_setup task_setup_data = { 2560 .rpc_client = server->client, 2561 .rpc_message = &msg, 2562 .callback_ops = &nfs4_open_ops, 2563 .callback_data = data, 2564 .workqueue = nfsiod_workqueue, 2565 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2566 }; 2567 int status; 2568 2569 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2570 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2571 2572 kref_get(&data->kref); 2573 data->rpc_done = false; 2574 data->rpc_status = 0; 2575 data->cancelled = false; 2576 data->is_recover = false; 2577 if (!ctx) { 2578 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2579 data->is_recover = true; 2580 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2581 } else { 2582 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2583 pnfs_lgopen_prepare(data, ctx); 2584 } 2585 task = rpc_run_task(&task_setup_data); 2586 if (IS_ERR(task)) 2587 return PTR_ERR(task); 2588 status = rpc_wait_for_completion_task(task); 2589 if (status != 0) { 2590 data->cancelled = true; 2591 smp_wmb(); 2592 } else 2593 status = data->rpc_status; 2594 rpc_put_task(task); 2595 2596 return status; 2597 } 2598 2599 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2600 { 2601 struct inode *dir = d_inode(data->dir); 2602 struct nfs_openres *o_res = &data->o_res; 2603 int status; 2604 2605 status = nfs4_run_open_task(data, NULL); 2606 if (status != 0 || !data->rpc_done) 2607 return status; 2608 2609 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2610 2611 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2612 status = _nfs4_proc_open_confirm(data); 2613 2614 return status; 2615 } 2616 2617 /* 2618 * Additional permission checks in order to distinguish between an 2619 * open for read, and an open for execute. This works around the 2620 * fact that NFSv4 OPEN treats read and execute permissions as being 2621 * the same. 2622 * Note that in the non-execute case, we want to turn off permission 2623 * checking if we just created a new file (POSIX open() semantics). 2624 */ 2625 static int nfs4_opendata_access(const struct cred *cred, 2626 struct nfs4_opendata *opendata, 2627 struct nfs4_state *state, fmode_t fmode, 2628 int openflags) 2629 { 2630 struct nfs_access_entry cache; 2631 u32 mask, flags; 2632 2633 /* access call failed or for some reason the server doesn't 2634 * support any access modes -- defer access call until later */ 2635 if (opendata->o_res.access_supported == 0) 2636 return 0; 2637 2638 mask = 0; 2639 /* 2640 * Use openflags to check for exec, because fmode won't 2641 * always have FMODE_EXEC set when file open for exec. 2642 */ 2643 if (openflags & __FMODE_EXEC) { 2644 /* ONLY check for exec rights */ 2645 if (S_ISDIR(state->inode->i_mode)) 2646 mask = NFS4_ACCESS_LOOKUP; 2647 else 2648 mask = NFS4_ACCESS_EXECUTE; 2649 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2650 mask = NFS4_ACCESS_READ; 2651 2652 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2653 nfs_access_add_cache(state->inode, &cache, cred); 2654 2655 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2656 if ((mask & ~cache.mask & flags) == 0) 2657 return 0; 2658 2659 return -EACCES; 2660 } 2661 2662 /* 2663 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2664 */ 2665 static int _nfs4_proc_open(struct nfs4_opendata *data, 2666 struct nfs_open_context *ctx) 2667 { 2668 struct inode *dir = d_inode(data->dir); 2669 struct nfs_server *server = NFS_SERVER(dir); 2670 struct nfs_openargs *o_arg = &data->o_arg; 2671 struct nfs_openres *o_res = &data->o_res; 2672 int status; 2673 2674 status = nfs4_run_open_task(data, ctx); 2675 if (!data->rpc_done) 2676 return status; 2677 if (status != 0) { 2678 if (status == -NFS4ERR_BADNAME && 2679 !(o_arg->open_flags & O_CREAT)) 2680 return -ENOENT; 2681 return status; 2682 } 2683 2684 nfs_fattr_map_and_free_names(server, &data->f_attr); 2685 2686 if (o_arg->open_flags & O_CREAT) { 2687 if (o_arg->open_flags & O_EXCL) 2688 data->file_created = true; 2689 else if (o_res->cinfo.before != o_res->cinfo.after) 2690 data->file_created = true; 2691 if (data->file_created || 2692 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2693 nfs4_update_changeattr(dir, &o_res->cinfo, 2694 o_res->f_attr->time_start, 2695 NFS_INO_INVALID_DATA); 2696 } 2697 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2698 server->caps &= ~NFS_CAP_POSIX_LOCK; 2699 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2700 status = _nfs4_proc_open_confirm(data); 2701 if (status != 0) 2702 return status; 2703 } 2704 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2705 nfs4_sequence_free_slot(&o_res->seq_res); 2706 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL); 2707 } 2708 return 0; 2709 } 2710 2711 /* 2712 * OPEN_EXPIRED: 2713 * reclaim state on the server after a network partition. 2714 * Assumes caller holds the appropriate lock 2715 */ 2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2717 { 2718 struct nfs4_opendata *opendata; 2719 int ret; 2720 2721 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2722 NFS4_OPEN_CLAIM_FH); 2723 if (IS_ERR(opendata)) 2724 return PTR_ERR(opendata); 2725 ret = nfs4_open_recover(opendata, state); 2726 if (ret == -ESTALE) 2727 d_drop(ctx->dentry); 2728 nfs4_opendata_put(opendata); 2729 return ret; 2730 } 2731 2732 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2733 { 2734 struct nfs_server *server = NFS_SERVER(state->inode); 2735 struct nfs4_exception exception = { }; 2736 int err; 2737 2738 do { 2739 err = _nfs4_open_expired(ctx, state); 2740 trace_nfs4_open_expired(ctx, 0, err); 2741 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2742 continue; 2743 switch (err) { 2744 default: 2745 goto out; 2746 case -NFS4ERR_GRACE: 2747 case -NFS4ERR_DELAY: 2748 nfs4_handle_exception(server, err, &exception); 2749 err = 0; 2750 } 2751 } while (exception.retry); 2752 out: 2753 return err; 2754 } 2755 2756 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2757 { 2758 struct nfs_open_context *ctx; 2759 int ret; 2760 2761 ctx = nfs4_state_find_open_context(state); 2762 if (IS_ERR(ctx)) 2763 return -EAGAIN; 2764 ret = nfs4_do_open_expired(ctx, state); 2765 put_nfs_open_context(ctx); 2766 return ret; 2767 } 2768 2769 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2770 const nfs4_stateid *stateid) 2771 { 2772 nfs_remove_bad_delegation(state->inode, stateid); 2773 nfs_state_clear_delegation(state); 2774 } 2775 2776 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2777 { 2778 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2779 nfs_finish_clear_delegation_stateid(state, NULL); 2780 } 2781 2782 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2783 { 2784 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2785 nfs40_clear_delegation_stateid(state); 2786 nfs_state_clear_open_state_flags(state); 2787 return nfs4_open_expired(sp, state); 2788 } 2789 2790 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2791 nfs4_stateid *stateid, 2792 const struct cred *cred) 2793 { 2794 return -NFS4ERR_BAD_STATEID; 2795 } 2796 2797 #if defined(CONFIG_NFS_V4_1) 2798 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2799 nfs4_stateid *stateid, 2800 const struct cred *cred) 2801 { 2802 int status; 2803 2804 switch (stateid->type) { 2805 default: 2806 break; 2807 case NFS4_INVALID_STATEID_TYPE: 2808 case NFS4_SPECIAL_STATEID_TYPE: 2809 return -NFS4ERR_BAD_STATEID; 2810 case NFS4_REVOKED_STATEID_TYPE: 2811 goto out_free; 2812 } 2813 2814 status = nfs41_test_stateid(server, stateid, cred); 2815 switch (status) { 2816 case -NFS4ERR_EXPIRED: 2817 case -NFS4ERR_ADMIN_REVOKED: 2818 case -NFS4ERR_DELEG_REVOKED: 2819 break; 2820 default: 2821 return status; 2822 } 2823 out_free: 2824 /* Ack the revoked state to the server */ 2825 nfs41_free_stateid(server, stateid, cred, true); 2826 return -NFS4ERR_EXPIRED; 2827 } 2828 2829 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2830 { 2831 struct nfs_server *server = NFS_SERVER(state->inode); 2832 nfs4_stateid stateid; 2833 struct nfs_delegation *delegation; 2834 const struct cred *cred = NULL; 2835 int status, ret = NFS_OK; 2836 2837 /* Get the delegation credential for use by test/free_stateid */ 2838 rcu_read_lock(); 2839 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2840 if (delegation == NULL) { 2841 rcu_read_unlock(); 2842 nfs_state_clear_delegation(state); 2843 return NFS_OK; 2844 } 2845 2846 spin_lock(&delegation->lock); 2847 nfs4_stateid_copy(&stateid, &delegation->stateid); 2848 2849 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2850 &delegation->flags)) { 2851 spin_unlock(&delegation->lock); 2852 rcu_read_unlock(); 2853 return NFS_OK; 2854 } 2855 2856 if (delegation->cred) 2857 cred = get_cred(delegation->cred); 2858 spin_unlock(&delegation->lock); 2859 rcu_read_unlock(); 2860 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2861 trace_nfs4_test_delegation_stateid(state, NULL, status); 2862 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2863 nfs_finish_clear_delegation_stateid(state, &stateid); 2864 else 2865 ret = status; 2866 2867 put_cred(cred); 2868 return ret; 2869 } 2870 2871 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2872 { 2873 nfs4_stateid tmp; 2874 2875 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2876 nfs4_copy_delegation_stateid(state->inode, state->state, 2877 &tmp, NULL) && 2878 nfs4_stateid_match_other(&state->stateid, &tmp)) 2879 nfs_state_set_delegation(state, &tmp, state->state); 2880 else 2881 nfs_state_clear_delegation(state); 2882 } 2883 2884 /** 2885 * nfs41_check_expired_locks - possibly free a lock stateid 2886 * 2887 * @state: NFSv4 state for an inode 2888 * 2889 * Returns NFS_OK if recovery for this stateid is now finished. 2890 * Otherwise a negative NFS4ERR value is returned. 2891 */ 2892 static int nfs41_check_expired_locks(struct nfs4_state *state) 2893 { 2894 int status, ret = NFS_OK; 2895 struct nfs4_lock_state *lsp, *prev = NULL; 2896 struct nfs_server *server = NFS_SERVER(state->inode); 2897 2898 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2899 goto out; 2900 2901 spin_lock(&state->state_lock); 2902 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2903 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2904 const struct cred *cred = lsp->ls_state->owner->so_cred; 2905 2906 refcount_inc(&lsp->ls_count); 2907 spin_unlock(&state->state_lock); 2908 2909 nfs4_put_lock_state(prev); 2910 prev = lsp; 2911 2912 status = nfs41_test_and_free_expired_stateid(server, 2913 &lsp->ls_stateid, 2914 cred); 2915 trace_nfs4_test_lock_stateid(state, lsp, status); 2916 if (status == -NFS4ERR_EXPIRED || 2917 status == -NFS4ERR_BAD_STATEID) { 2918 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2919 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2920 if (!recover_lost_locks) 2921 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2922 } else if (status != NFS_OK) { 2923 ret = status; 2924 nfs4_put_lock_state(prev); 2925 goto out; 2926 } 2927 spin_lock(&state->state_lock); 2928 } 2929 } 2930 spin_unlock(&state->state_lock); 2931 nfs4_put_lock_state(prev); 2932 out: 2933 return ret; 2934 } 2935 2936 /** 2937 * nfs41_check_open_stateid - possibly free an open stateid 2938 * 2939 * @state: NFSv4 state for an inode 2940 * 2941 * Returns NFS_OK if recovery for this stateid is now finished. 2942 * Otherwise a negative NFS4ERR value is returned. 2943 */ 2944 static int nfs41_check_open_stateid(struct nfs4_state *state) 2945 { 2946 struct nfs_server *server = NFS_SERVER(state->inode); 2947 nfs4_stateid *stateid = &state->open_stateid; 2948 const struct cred *cred = state->owner->so_cred; 2949 int status; 2950 2951 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2952 return -NFS4ERR_BAD_STATEID; 2953 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2954 trace_nfs4_test_open_stateid(state, NULL, status); 2955 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2956 nfs_state_clear_open_state_flags(state); 2957 stateid->type = NFS4_INVALID_STATEID_TYPE; 2958 return status; 2959 } 2960 if (nfs_open_stateid_recover_openmode(state)) 2961 return -NFS4ERR_OPENMODE; 2962 return NFS_OK; 2963 } 2964 2965 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2966 { 2967 int status; 2968 2969 status = nfs41_check_delegation_stateid(state); 2970 if (status != NFS_OK) 2971 return status; 2972 nfs41_delegation_recover_stateid(state); 2973 2974 status = nfs41_check_expired_locks(state); 2975 if (status != NFS_OK) 2976 return status; 2977 status = nfs41_check_open_stateid(state); 2978 if (status != NFS_OK) 2979 status = nfs4_open_expired(sp, state); 2980 return status; 2981 } 2982 #endif 2983 2984 /* 2985 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2986 * fields corresponding to attributes that were used to store the verifier. 2987 * Make sure we clobber those fields in the later setattr call 2988 */ 2989 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2990 struct iattr *sattr, struct nfs4_label **label) 2991 { 2992 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2993 __u32 attrset[3]; 2994 unsigned ret; 2995 unsigned i; 2996 2997 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 2998 attrset[i] = opendata->o_res.attrset[i]; 2999 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3000 attrset[i] &= ~bitmask[i]; 3001 } 3002 3003 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3004 sattr->ia_valid : 0; 3005 3006 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3007 if (sattr->ia_valid & ATTR_ATIME_SET) 3008 ret |= ATTR_ATIME_SET; 3009 else 3010 ret |= ATTR_ATIME; 3011 } 3012 3013 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3014 if (sattr->ia_valid & ATTR_MTIME_SET) 3015 ret |= ATTR_MTIME_SET; 3016 else 3017 ret |= ATTR_MTIME; 3018 } 3019 3020 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3021 *label = NULL; 3022 return ret; 3023 } 3024 3025 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3026 int flags, struct nfs_open_context *ctx) 3027 { 3028 struct nfs4_state_owner *sp = opendata->owner; 3029 struct nfs_server *server = sp->so_server; 3030 struct dentry *dentry; 3031 struct nfs4_state *state; 3032 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3033 struct inode *dir = d_inode(opendata->dir); 3034 unsigned long dir_verifier; 3035 unsigned int seq; 3036 int ret; 3037 3038 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3039 dir_verifier = nfs_save_change_attribute(dir); 3040 3041 ret = _nfs4_proc_open(opendata, ctx); 3042 if (ret != 0) 3043 goto out; 3044 3045 state = _nfs4_opendata_to_nfs4_state(opendata); 3046 ret = PTR_ERR(state); 3047 if (IS_ERR(state)) 3048 goto out; 3049 ctx->state = state; 3050 if (server->caps & NFS_CAP_POSIX_LOCK) 3051 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3052 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3053 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3054 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3055 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3056 3057 dentry = opendata->dentry; 3058 if (d_really_is_negative(dentry)) { 3059 struct dentry *alias; 3060 d_drop(dentry); 3061 alias = d_exact_alias(dentry, state->inode); 3062 if (!alias) 3063 alias = d_splice_alias(igrab(state->inode), dentry); 3064 /* d_splice_alias() can't fail here - it's a non-directory */ 3065 if (alias) { 3066 dput(ctx->dentry); 3067 ctx->dentry = dentry = alias; 3068 } 3069 } 3070 3071 switch(opendata->o_arg.claim) { 3072 default: 3073 break; 3074 case NFS4_OPEN_CLAIM_NULL: 3075 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3076 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3077 if (!opendata->rpc_done) 3078 break; 3079 if (opendata->o_res.delegation_type != 0) 3080 dir_verifier = nfs_save_change_attribute(dir); 3081 nfs_set_verifier(dentry, dir_verifier); 3082 } 3083 3084 /* Parse layoutget results before we check for access */ 3085 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3086 3087 ret = nfs4_opendata_access(sp->so_cred, opendata, state, 3088 acc_mode, flags); 3089 if (ret != 0) 3090 goto out; 3091 3092 if (d_inode(dentry) == state->inode) { 3093 nfs_inode_attach_open_context(ctx); 3094 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3095 nfs4_schedule_stateid_recovery(server, state); 3096 } 3097 3098 out: 3099 if (!opendata->cancelled) { 3100 if (opendata->lgp) { 3101 nfs4_lgopen_release(opendata->lgp); 3102 opendata->lgp = NULL; 3103 } 3104 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3105 } 3106 return ret; 3107 } 3108 3109 /* 3110 * Returns a referenced nfs4_state 3111 */ 3112 static int _nfs4_do_open(struct inode *dir, 3113 struct nfs_open_context *ctx, 3114 int flags, 3115 const struct nfs4_open_createattrs *c, 3116 int *opened) 3117 { 3118 struct nfs4_state_owner *sp; 3119 struct nfs4_state *state = NULL; 3120 struct nfs_server *server = NFS_SERVER(dir); 3121 struct nfs4_opendata *opendata; 3122 struct dentry *dentry = ctx->dentry; 3123 const struct cred *cred = ctx->cred; 3124 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3125 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3126 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3127 struct iattr *sattr = c->sattr; 3128 struct nfs4_label *label = c->label; 3129 int status; 3130 3131 /* Protect against reboot recovery conflicts */ 3132 status = -ENOMEM; 3133 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3134 if (sp == NULL) { 3135 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3136 goto out_err; 3137 } 3138 status = nfs4_client_recover_expired_lease(server->nfs_client); 3139 if (status != 0) 3140 goto err_put_state_owner; 3141 if (d_really_is_positive(dentry)) 3142 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3143 status = -ENOMEM; 3144 if (d_really_is_positive(dentry)) 3145 claim = NFS4_OPEN_CLAIM_FH; 3146 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3147 c, claim, GFP_KERNEL); 3148 if (opendata == NULL) 3149 goto err_put_state_owner; 3150 3151 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3152 if (!opendata->f_attr.mdsthreshold) { 3153 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3154 if (!opendata->f_attr.mdsthreshold) 3155 goto err_opendata_put; 3156 } 3157 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3158 } 3159 if (d_really_is_positive(dentry)) 3160 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3161 3162 status = _nfs4_open_and_get_state(opendata, flags, ctx); 3163 if (status != 0) 3164 goto err_opendata_put; 3165 state = ctx->state; 3166 3167 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3168 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3169 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3170 /* 3171 * send create attributes which was not set by open 3172 * with an extra setattr. 3173 */ 3174 if (attrs || label) { 3175 unsigned ia_old = sattr->ia_valid; 3176 3177 sattr->ia_valid = attrs; 3178 nfs_fattr_init(opendata->o_res.f_attr); 3179 status = nfs4_do_setattr(state->inode, cred, 3180 opendata->o_res.f_attr, sattr, 3181 ctx, label); 3182 if (status == 0) { 3183 nfs_setattr_update_inode(state->inode, sattr, 3184 opendata->o_res.f_attr); 3185 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3186 } 3187 sattr->ia_valid = ia_old; 3188 } 3189 } 3190 if (opened && opendata->file_created) 3191 *opened = 1; 3192 3193 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3194 *ctx_th = opendata->f_attr.mdsthreshold; 3195 opendata->f_attr.mdsthreshold = NULL; 3196 } 3197 3198 nfs4_opendata_put(opendata); 3199 nfs4_put_state_owner(sp); 3200 return 0; 3201 err_opendata_put: 3202 nfs4_opendata_put(opendata); 3203 err_put_state_owner: 3204 nfs4_put_state_owner(sp); 3205 out_err: 3206 return status; 3207 } 3208 3209 3210 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3211 struct nfs_open_context *ctx, 3212 int flags, 3213 struct iattr *sattr, 3214 struct nfs4_label *label, 3215 int *opened) 3216 { 3217 struct nfs_server *server = NFS_SERVER(dir); 3218 struct nfs4_exception exception = { 3219 .interruptible = true, 3220 }; 3221 struct nfs4_state *res; 3222 struct nfs4_open_createattrs c = { 3223 .label = label, 3224 .sattr = sattr, 3225 .verf = { 3226 [0] = (__u32)jiffies, 3227 [1] = (__u32)current->pid, 3228 }, 3229 }; 3230 int status; 3231 3232 do { 3233 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3234 res = ctx->state; 3235 trace_nfs4_open_file(ctx, flags, status); 3236 if (status == 0) 3237 break; 3238 /* NOTE: BAD_SEQID means the server and client disagree about the 3239 * book-keeping w.r.t. state-changing operations 3240 * (OPEN/CLOSE/LOCK/LOCKU...) 3241 * It is actually a sign of a bug on the client or on the server. 3242 * 3243 * If we receive a BAD_SEQID error in the particular case of 3244 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3245 * have unhashed the old state_owner for us, and that we can 3246 * therefore safely retry using a new one. We should still warn 3247 * the user though... 3248 */ 3249 if (status == -NFS4ERR_BAD_SEQID) { 3250 pr_warn_ratelimited("NFS: v4 server %s " 3251 " returned a bad sequence-id error!\n", 3252 NFS_SERVER(dir)->nfs_client->cl_hostname); 3253 exception.retry = 1; 3254 continue; 3255 } 3256 /* 3257 * BAD_STATEID on OPEN means that the server cancelled our 3258 * state before it received the OPEN_CONFIRM. 3259 * Recover by retrying the request as per the discussion 3260 * on Page 181 of RFC3530. 3261 */ 3262 if (status == -NFS4ERR_BAD_STATEID) { 3263 exception.retry = 1; 3264 continue; 3265 } 3266 if (status == -NFS4ERR_EXPIRED) { 3267 nfs4_schedule_lease_recovery(server->nfs_client); 3268 exception.retry = 1; 3269 continue; 3270 } 3271 if (status == -EAGAIN) { 3272 /* We must have found a delegation */ 3273 exception.retry = 1; 3274 continue; 3275 } 3276 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3277 continue; 3278 res = ERR_PTR(nfs4_handle_exception(server, 3279 status, &exception)); 3280 } while (exception.retry); 3281 return res; 3282 } 3283 3284 static int _nfs4_do_setattr(struct inode *inode, 3285 struct nfs_setattrargs *arg, 3286 struct nfs_setattrres *res, 3287 const struct cred *cred, 3288 struct nfs_open_context *ctx) 3289 { 3290 struct nfs_server *server = NFS_SERVER(inode); 3291 struct rpc_message msg = { 3292 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3293 .rpc_argp = arg, 3294 .rpc_resp = res, 3295 .rpc_cred = cred, 3296 }; 3297 const struct cred *delegation_cred = NULL; 3298 unsigned long timestamp = jiffies; 3299 bool truncate; 3300 int status; 3301 3302 nfs_fattr_init(res->fattr); 3303 3304 /* Servers should only apply open mode checks for file size changes */ 3305 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3306 if (!truncate) { 3307 nfs4_inode_make_writeable(inode); 3308 goto zero_stateid; 3309 } 3310 3311 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3312 /* Use that stateid */ 3313 } else if (ctx != NULL && ctx->state) { 3314 struct nfs_lock_context *l_ctx; 3315 if (!nfs4_valid_open_stateid(ctx->state)) 3316 return -EBADF; 3317 l_ctx = nfs_get_lock_context(ctx); 3318 if (IS_ERR(l_ctx)) 3319 return PTR_ERR(l_ctx); 3320 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3321 &arg->stateid, &delegation_cred); 3322 nfs_put_lock_context(l_ctx); 3323 if (status == -EIO) 3324 return -EBADF; 3325 else if (status == -EAGAIN) 3326 goto zero_stateid; 3327 } else { 3328 zero_stateid: 3329 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3330 } 3331 if (delegation_cred) 3332 msg.rpc_cred = delegation_cred; 3333 3334 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3335 3336 put_cred(delegation_cred); 3337 if (status == 0 && ctx != NULL) 3338 renew_lease(server, timestamp); 3339 trace_nfs4_setattr(inode, &arg->stateid, status); 3340 return status; 3341 } 3342 3343 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3344 struct nfs_fattr *fattr, struct iattr *sattr, 3345 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3346 { 3347 struct nfs_server *server = NFS_SERVER(inode); 3348 __u32 bitmask[NFS4_BITMASK_SZ]; 3349 struct nfs4_state *state = ctx ? ctx->state : NULL; 3350 struct nfs_setattrargs arg = { 3351 .fh = NFS_FH(inode), 3352 .iap = sattr, 3353 .server = server, 3354 .bitmask = bitmask, 3355 .label = ilabel, 3356 }; 3357 struct nfs_setattrres res = { 3358 .fattr = fattr, 3359 .server = server, 3360 }; 3361 struct nfs4_exception exception = { 3362 .state = state, 3363 .inode = inode, 3364 .stateid = &arg.stateid, 3365 }; 3366 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3367 int err; 3368 3369 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3370 adjust_flags |= NFS_INO_INVALID_MODE; 3371 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3372 adjust_flags |= NFS_INO_INVALID_OTHER; 3373 3374 do { 3375 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3376 inode, adjust_flags); 3377 3378 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3379 switch (err) { 3380 case -NFS4ERR_OPENMODE: 3381 if (!(sattr->ia_valid & ATTR_SIZE)) { 3382 pr_warn_once("NFSv4: server %s is incorrectly " 3383 "applying open mode checks to " 3384 "a SETATTR that is not " 3385 "changing file size.\n", 3386 server->nfs_client->cl_hostname); 3387 } 3388 if (state && !(state->state & FMODE_WRITE)) { 3389 err = -EBADF; 3390 if (sattr->ia_valid & ATTR_OPEN) 3391 err = -EACCES; 3392 goto out; 3393 } 3394 } 3395 err = nfs4_handle_exception(server, err, &exception); 3396 } while (exception.retry); 3397 out: 3398 return err; 3399 } 3400 3401 static bool 3402 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3403 { 3404 if (inode == NULL || !nfs_have_layout(inode)) 3405 return false; 3406 3407 return pnfs_wait_on_layoutreturn(inode, task); 3408 } 3409 3410 /* 3411 * Update the seqid of an open stateid 3412 */ 3413 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3414 struct nfs4_state *state) 3415 { 3416 __be32 seqid_open; 3417 u32 dst_seqid; 3418 int seq; 3419 3420 for (;;) { 3421 if (!nfs4_valid_open_stateid(state)) 3422 break; 3423 seq = read_seqbegin(&state->seqlock); 3424 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3425 nfs4_stateid_copy(dst, &state->open_stateid); 3426 if (read_seqretry(&state->seqlock, seq)) 3427 continue; 3428 break; 3429 } 3430 seqid_open = state->open_stateid.seqid; 3431 if (read_seqretry(&state->seqlock, seq)) 3432 continue; 3433 3434 dst_seqid = be32_to_cpu(dst->seqid); 3435 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3436 dst->seqid = seqid_open; 3437 break; 3438 } 3439 } 3440 3441 /* 3442 * Update the seqid of an open stateid after receiving 3443 * NFS4ERR_OLD_STATEID 3444 */ 3445 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3446 struct nfs4_state *state) 3447 { 3448 __be32 seqid_open; 3449 u32 dst_seqid; 3450 bool ret; 3451 int seq, status = -EAGAIN; 3452 DEFINE_WAIT(wait); 3453 3454 for (;;) { 3455 ret = false; 3456 if (!nfs4_valid_open_stateid(state)) 3457 break; 3458 seq = read_seqbegin(&state->seqlock); 3459 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3460 if (read_seqretry(&state->seqlock, seq)) 3461 continue; 3462 break; 3463 } 3464 3465 write_seqlock(&state->seqlock); 3466 seqid_open = state->open_stateid.seqid; 3467 3468 dst_seqid = be32_to_cpu(dst->seqid); 3469 3470 /* Did another OPEN bump the state's seqid? try again: */ 3471 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3472 dst->seqid = seqid_open; 3473 write_sequnlock(&state->seqlock); 3474 ret = true; 3475 break; 3476 } 3477 3478 /* server says we're behind but we haven't seen the update yet */ 3479 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3480 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3481 write_sequnlock(&state->seqlock); 3482 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3483 3484 if (fatal_signal_pending(current)) 3485 status = -EINTR; 3486 else 3487 if (schedule_timeout(5*HZ) != 0) 3488 status = 0; 3489 3490 finish_wait(&state->waitq, &wait); 3491 3492 if (!status) 3493 continue; 3494 if (status == -EINTR) 3495 break; 3496 3497 /* we slept the whole 5 seconds, we must have lost a seqid */ 3498 dst->seqid = cpu_to_be32(dst_seqid + 1); 3499 ret = true; 3500 break; 3501 } 3502 3503 return ret; 3504 } 3505 3506 struct nfs4_closedata { 3507 struct inode *inode; 3508 struct nfs4_state *state; 3509 struct nfs_closeargs arg; 3510 struct nfs_closeres res; 3511 struct { 3512 struct nfs4_layoutreturn_args arg; 3513 struct nfs4_layoutreturn_res res; 3514 struct nfs4_xdr_opaque_data ld_private; 3515 u32 roc_barrier; 3516 bool roc; 3517 } lr; 3518 struct nfs_fattr fattr; 3519 unsigned long timestamp; 3520 }; 3521 3522 static void nfs4_free_closedata(void *data) 3523 { 3524 struct nfs4_closedata *calldata = data; 3525 struct nfs4_state_owner *sp = calldata->state->owner; 3526 struct super_block *sb = calldata->state->inode->i_sb; 3527 3528 if (calldata->lr.roc) 3529 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3530 calldata->res.lr_ret); 3531 nfs4_put_open_state(calldata->state); 3532 nfs_free_seqid(calldata->arg.seqid); 3533 nfs4_put_state_owner(sp); 3534 nfs_sb_deactive(sb); 3535 kfree(calldata); 3536 } 3537 3538 static void nfs4_close_done(struct rpc_task *task, void *data) 3539 { 3540 struct nfs4_closedata *calldata = data; 3541 struct nfs4_state *state = calldata->state; 3542 struct nfs_server *server = NFS_SERVER(calldata->inode); 3543 nfs4_stateid *res_stateid = NULL; 3544 struct nfs4_exception exception = { 3545 .state = state, 3546 .inode = calldata->inode, 3547 .stateid = &calldata->arg.stateid, 3548 }; 3549 3550 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3551 return; 3552 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3553 3554 /* Handle Layoutreturn errors */ 3555 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3556 &calldata->res.lr_ret) == -EAGAIN) 3557 goto out_restart; 3558 3559 /* hmm. we are done with the inode, and in the process of freeing 3560 * the state_owner. we keep this around to process errors 3561 */ 3562 switch (task->tk_status) { 3563 case 0: 3564 res_stateid = &calldata->res.stateid; 3565 renew_lease(server, calldata->timestamp); 3566 break; 3567 case -NFS4ERR_ACCESS: 3568 if (calldata->arg.bitmask != NULL) { 3569 calldata->arg.bitmask = NULL; 3570 calldata->res.fattr = NULL; 3571 goto out_restart; 3572 3573 } 3574 break; 3575 case -NFS4ERR_OLD_STATEID: 3576 /* Did we race with OPEN? */ 3577 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3578 state)) 3579 goto out_restart; 3580 goto out_release; 3581 case -NFS4ERR_ADMIN_REVOKED: 3582 case -NFS4ERR_STALE_STATEID: 3583 case -NFS4ERR_EXPIRED: 3584 nfs4_free_revoked_stateid(server, 3585 &calldata->arg.stateid, 3586 task->tk_msg.rpc_cred); 3587 fallthrough; 3588 case -NFS4ERR_BAD_STATEID: 3589 if (calldata->arg.fmode == 0) 3590 break; 3591 fallthrough; 3592 default: 3593 task->tk_status = nfs4_async_handle_exception(task, 3594 server, task->tk_status, &exception); 3595 if (exception.retry) 3596 goto out_restart; 3597 } 3598 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3599 res_stateid, calldata->arg.fmode); 3600 out_release: 3601 task->tk_status = 0; 3602 nfs_release_seqid(calldata->arg.seqid); 3603 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3604 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3605 return; 3606 out_restart: 3607 task->tk_status = 0; 3608 rpc_restart_call_prepare(task); 3609 goto out_release; 3610 } 3611 3612 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3613 { 3614 struct nfs4_closedata *calldata = data; 3615 struct nfs4_state *state = calldata->state; 3616 struct inode *inode = calldata->inode; 3617 struct nfs_server *server = NFS_SERVER(inode); 3618 struct pnfs_layout_hdr *lo; 3619 bool is_rdonly, is_wronly, is_rdwr; 3620 int call_close = 0; 3621 3622 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3623 goto out_wait; 3624 3625 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3626 spin_lock(&state->owner->so_lock); 3627 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3628 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3629 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3630 /* Calculate the change in open mode */ 3631 calldata->arg.fmode = 0; 3632 if (state->n_rdwr == 0) { 3633 if (state->n_rdonly == 0) 3634 call_close |= is_rdonly; 3635 else if (is_rdonly) 3636 calldata->arg.fmode |= FMODE_READ; 3637 if (state->n_wronly == 0) 3638 call_close |= is_wronly; 3639 else if (is_wronly) 3640 calldata->arg.fmode |= FMODE_WRITE; 3641 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3642 call_close |= is_rdwr; 3643 } else if (is_rdwr) 3644 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3645 3646 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3647 if (!nfs4_valid_open_stateid(state)) 3648 call_close = 0; 3649 spin_unlock(&state->owner->so_lock); 3650 3651 if (!call_close) { 3652 /* Note: exit _without_ calling nfs4_close_done */ 3653 goto out_no_action; 3654 } 3655 3656 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3657 nfs_release_seqid(calldata->arg.seqid); 3658 goto out_wait; 3659 } 3660 3661 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3662 if (lo && !pnfs_layout_is_valid(lo)) { 3663 calldata->arg.lr_args = NULL; 3664 calldata->res.lr_res = NULL; 3665 } 3666 3667 if (calldata->arg.fmode == 0) 3668 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3669 3670 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3671 /* Close-to-open cache consistency revalidation */ 3672 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3673 nfs4_bitmask_set(calldata->arg.bitmask_store, 3674 server->cache_consistency_bitmask, 3675 inode, 0); 3676 calldata->arg.bitmask = calldata->arg.bitmask_store; 3677 } else 3678 calldata->arg.bitmask = NULL; 3679 } 3680 3681 calldata->arg.share_access = 3682 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3683 calldata->arg.fmode, 0); 3684 3685 if (calldata->res.fattr == NULL) 3686 calldata->arg.bitmask = NULL; 3687 else if (calldata->arg.bitmask == NULL) 3688 calldata->res.fattr = NULL; 3689 calldata->timestamp = jiffies; 3690 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3691 &calldata->arg.seq_args, 3692 &calldata->res.seq_res, 3693 task) != 0) 3694 nfs_release_seqid(calldata->arg.seqid); 3695 return; 3696 out_no_action: 3697 task->tk_action = NULL; 3698 out_wait: 3699 nfs4_sequence_done(task, &calldata->res.seq_res); 3700 } 3701 3702 static const struct rpc_call_ops nfs4_close_ops = { 3703 .rpc_call_prepare = nfs4_close_prepare, 3704 .rpc_call_done = nfs4_close_done, 3705 .rpc_release = nfs4_free_closedata, 3706 }; 3707 3708 /* 3709 * It is possible for data to be read/written from a mem-mapped file 3710 * after the sys_close call (which hits the vfs layer as a flush). 3711 * This means that we can't safely call nfsv4 close on a file until 3712 * the inode is cleared. This in turn means that we are not good 3713 * NFSv4 citizens - we do not indicate to the server to update the file's 3714 * share state even when we are done with one of the three share 3715 * stateid's in the inode. 3716 * 3717 * NOTE: Caller must be holding the sp->so_owner semaphore! 3718 */ 3719 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3720 { 3721 struct nfs_server *server = NFS_SERVER(state->inode); 3722 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3723 struct nfs4_closedata *calldata; 3724 struct nfs4_state_owner *sp = state->owner; 3725 struct rpc_task *task; 3726 struct rpc_message msg = { 3727 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3728 .rpc_cred = state->owner->so_cred, 3729 }; 3730 struct rpc_task_setup task_setup_data = { 3731 .rpc_client = server->client, 3732 .rpc_message = &msg, 3733 .callback_ops = &nfs4_close_ops, 3734 .workqueue = nfsiod_workqueue, 3735 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3736 }; 3737 int status = -ENOMEM; 3738 3739 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3740 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3741 3742 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3743 &task_setup_data.rpc_client, &msg); 3744 3745 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3746 if (calldata == NULL) 3747 goto out; 3748 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3749 calldata->inode = state->inode; 3750 calldata->state = state; 3751 calldata->arg.fh = NFS_FH(state->inode); 3752 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3753 goto out_free_calldata; 3754 /* Serialization for the sequence id */ 3755 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3756 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3757 if (IS_ERR(calldata->arg.seqid)) 3758 goto out_free_calldata; 3759 nfs_fattr_init(&calldata->fattr); 3760 calldata->arg.fmode = 0; 3761 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3762 calldata->res.fattr = &calldata->fattr; 3763 calldata->res.seqid = calldata->arg.seqid; 3764 calldata->res.server = server; 3765 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3766 calldata->lr.roc = pnfs_roc(state->inode, 3767 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3768 if (calldata->lr.roc) { 3769 calldata->arg.lr_args = &calldata->lr.arg; 3770 calldata->res.lr_res = &calldata->lr.res; 3771 } 3772 nfs_sb_active(calldata->inode->i_sb); 3773 3774 msg.rpc_argp = &calldata->arg; 3775 msg.rpc_resp = &calldata->res; 3776 task_setup_data.callback_data = calldata; 3777 task = rpc_run_task(&task_setup_data); 3778 if (IS_ERR(task)) 3779 return PTR_ERR(task); 3780 status = 0; 3781 if (wait) 3782 status = rpc_wait_for_completion_task(task); 3783 rpc_put_task(task); 3784 return status; 3785 out_free_calldata: 3786 kfree(calldata); 3787 out: 3788 nfs4_put_open_state(state); 3789 nfs4_put_state_owner(sp); 3790 return status; 3791 } 3792 3793 static struct inode * 3794 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3795 int open_flags, struct iattr *attr, int *opened) 3796 { 3797 struct nfs4_state *state; 3798 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3799 3800 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3801 3802 /* Protect against concurrent sillydeletes */ 3803 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3804 3805 nfs4_label_release_security(label); 3806 3807 if (IS_ERR(state)) 3808 return ERR_CAST(state); 3809 return state->inode; 3810 } 3811 3812 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3813 { 3814 if (ctx->state == NULL) 3815 return; 3816 if (is_sync) 3817 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3818 else 3819 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3820 } 3821 3822 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3823 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3824 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3825 3826 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3827 { 3828 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3829 struct nfs4_server_caps_arg args = { 3830 .fhandle = fhandle, 3831 .bitmask = bitmask, 3832 }; 3833 struct nfs4_server_caps_res res = {}; 3834 struct rpc_message msg = { 3835 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3836 .rpc_argp = &args, 3837 .rpc_resp = &res, 3838 }; 3839 int status; 3840 int i; 3841 3842 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3843 FATTR4_WORD0_FH_EXPIRE_TYPE | 3844 FATTR4_WORD0_LINK_SUPPORT | 3845 FATTR4_WORD0_SYMLINK_SUPPORT | 3846 FATTR4_WORD0_ACLSUPPORT | 3847 FATTR4_WORD0_CASE_INSENSITIVE | 3848 FATTR4_WORD0_CASE_PRESERVING; 3849 if (minorversion) 3850 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3851 3852 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3853 if (status == 0) { 3854 /* Sanity check the server answers */ 3855 switch (minorversion) { 3856 case 0: 3857 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3858 res.attr_bitmask[2] = 0; 3859 break; 3860 case 1: 3861 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3862 break; 3863 case 2: 3864 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3865 } 3866 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3867 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3868 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3869 server->fattr_valid = NFS_ATTR_FATTR_V4; 3870 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3871 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3872 server->caps |= NFS_CAP_ACLS; 3873 if (res.has_links != 0) 3874 server->caps |= NFS_CAP_HARDLINKS; 3875 if (res.has_symlinks != 0) 3876 server->caps |= NFS_CAP_SYMLINKS; 3877 if (res.case_insensitive) 3878 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3879 if (res.case_preserving) 3880 server->caps |= NFS_CAP_CASE_PRESERVING; 3881 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3882 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3883 server->caps |= NFS_CAP_SECURITY_LABEL; 3884 #endif 3885 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3886 server->caps |= NFS_CAP_FS_LOCATIONS; 3887 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3888 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3889 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3890 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3891 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3892 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3893 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3894 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3895 NFS_ATTR_FATTR_OWNER_NAME); 3896 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3897 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3898 NFS_ATTR_FATTR_GROUP_NAME); 3899 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3900 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3901 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3902 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3903 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3904 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3905 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3906 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3907 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3908 sizeof(server->attr_bitmask)); 3909 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3910 3911 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3912 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3913 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3914 server->cache_consistency_bitmask[2] = 0; 3915 3916 /* Avoid a regression due to buggy server */ 3917 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3918 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3919 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3920 sizeof(server->exclcreat_bitmask)); 3921 3922 server->acl_bitmask = res.acl_bitmask; 3923 server->fh_expire_type = res.fh_expire_type; 3924 } 3925 3926 return status; 3927 } 3928 3929 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3930 { 3931 struct nfs4_exception exception = { 3932 .interruptible = true, 3933 }; 3934 int err; 3935 3936 nfs4_server_set_init_caps(server); 3937 do { 3938 err = nfs4_handle_exception(server, 3939 _nfs4_server_capabilities(server, fhandle), 3940 &exception); 3941 } while (exception.retry); 3942 return err; 3943 } 3944 3945 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3946 struct nfs_client *clp, 3947 struct nfs_server *server) 3948 { 3949 int i; 3950 3951 for (i = 0; i < location->nservers; i++) { 3952 struct nfs4_string *srv_loc = &location->servers[i]; 3953 struct sockaddr addr; 3954 size_t addrlen; 3955 struct xprt_create xprt_args = { 3956 .ident = 0, 3957 .net = clp->cl_net, 3958 }; 3959 struct nfs4_add_xprt_data xprtdata = { 3960 .clp = clp, 3961 }; 3962 struct rpc_add_xprt_test rpcdata = { 3963 .add_xprt_test = clp->cl_mvops->session_trunk, 3964 .data = &xprtdata, 3965 }; 3966 char *servername = NULL; 3967 3968 if (!srv_loc->len) 3969 continue; 3970 3971 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3972 &addr, sizeof(addr), 3973 clp->cl_net, server->port); 3974 if (!addrlen) 3975 return; 3976 xprt_args.dstaddr = &addr; 3977 xprt_args.addrlen = addrlen; 3978 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3979 if (!servername) 3980 return; 3981 memcpy(servername, srv_loc->data, srv_loc->len); 3982 servername[srv_loc->len] = '\0'; 3983 xprt_args.servername = servername; 3984 3985 xprtdata.cred = nfs4_get_clid_cred(clp); 3986 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3987 rpc_clnt_setup_test_and_add_xprt, 3988 &rpcdata); 3989 if (xprtdata.cred) 3990 put_cred(xprtdata.cred); 3991 kfree(servername); 3992 } 3993 } 3994 3995 static int _nfs4_discover_trunking(struct nfs_server *server, 3996 struct nfs_fh *fhandle) 3997 { 3998 struct nfs4_fs_locations *locations = NULL; 3999 struct page *page; 4000 const struct cred *cred; 4001 struct nfs_client *clp = server->nfs_client; 4002 const struct nfs4_state_maintenance_ops *ops = 4003 clp->cl_mvops->state_renewal_ops; 4004 int status = -ENOMEM, i; 4005 4006 cred = ops->get_state_renewal_cred(clp); 4007 if (cred == NULL) { 4008 cred = nfs4_get_clid_cred(clp); 4009 if (cred == NULL) 4010 return -ENOKEY; 4011 } 4012 4013 page = alloc_page(GFP_KERNEL); 4014 if (!page) 4015 return -ENOMEM; 4016 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4017 if (!locations) 4018 goto out_free; 4019 locations->fattr = nfs_alloc_fattr(); 4020 if (!locations->fattr) 4021 goto out_free_2; 4022 4023 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4024 cred); 4025 if (status) 4026 goto out_free_3; 4027 4028 for (i = 0; i < locations->nlocations; i++) 4029 test_fs_location_for_trunking(&locations->locations[i], clp, 4030 server); 4031 out_free_3: 4032 kfree(locations->fattr); 4033 out_free_2: 4034 kfree(locations); 4035 out_free: 4036 __free_page(page); 4037 return status; 4038 } 4039 4040 static int nfs4_discover_trunking(struct nfs_server *server, 4041 struct nfs_fh *fhandle) 4042 { 4043 struct nfs4_exception exception = { 4044 .interruptible = true, 4045 }; 4046 struct nfs_client *clp = server->nfs_client; 4047 int err = 0; 4048 4049 if (!nfs4_has_session(clp)) 4050 goto out; 4051 do { 4052 err = nfs4_handle_exception(server, 4053 _nfs4_discover_trunking(server, fhandle), 4054 &exception); 4055 } while (exception.retry); 4056 out: 4057 return err; 4058 } 4059 4060 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4061 struct nfs_fsinfo *info) 4062 { 4063 u32 bitmask[3]; 4064 struct nfs4_lookup_root_arg args = { 4065 .bitmask = bitmask, 4066 }; 4067 struct nfs4_lookup_res res = { 4068 .server = server, 4069 .fattr = info->fattr, 4070 .fh = fhandle, 4071 }; 4072 struct rpc_message msg = { 4073 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4074 .rpc_argp = &args, 4075 .rpc_resp = &res, 4076 }; 4077 4078 bitmask[0] = nfs4_fattr_bitmap[0]; 4079 bitmask[1] = nfs4_fattr_bitmap[1]; 4080 /* 4081 * Process the label in the upcoming getfattr 4082 */ 4083 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4084 4085 nfs_fattr_init(info->fattr); 4086 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4087 } 4088 4089 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4090 struct nfs_fsinfo *info) 4091 { 4092 struct nfs4_exception exception = { 4093 .interruptible = true, 4094 }; 4095 int err; 4096 do { 4097 err = _nfs4_lookup_root(server, fhandle, info); 4098 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4099 switch (err) { 4100 case 0: 4101 case -NFS4ERR_WRONGSEC: 4102 goto out; 4103 default: 4104 err = nfs4_handle_exception(server, err, &exception); 4105 } 4106 } while (exception.retry); 4107 out: 4108 return err; 4109 } 4110 4111 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4112 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4113 { 4114 struct rpc_auth_create_args auth_args = { 4115 .pseudoflavor = flavor, 4116 }; 4117 struct rpc_auth *auth; 4118 4119 auth = rpcauth_create(&auth_args, server->client); 4120 if (IS_ERR(auth)) 4121 return -EACCES; 4122 return nfs4_lookup_root(server, fhandle, info); 4123 } 4124 4125 /* 4126 * Retry pseudoroot lookup with various security flavors. We do this when: 4127 * 4128 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4129 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4130 * 4131 * Returns zero on success, or a negative NFS4ERR value, or a 4132 * negative errno value. 4133 */ 4134 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4135 struct nfs_fsinfo *info) 4136 { 4137 /* Per 3530bis 15.33.5 */ 4138 static const rpc_authflavor_t flav_array[] = { 4139 RPC_AUTH_GSS_KRB5P, 4140 RPC_AUTH_GSS_KRB5I, 4141 RPC_AUTH_GSS_KRB5, 4142 RPC_AUTH_UNIX, /* courtesy */ 4143 RPC_AUTH_NULL, 4144 }; 4145 int status = -EPERM; 4146 size_t i; 4147 4148 if (server->auth_info.flavor_len > 0) { 4149 /* try each flavor specified by user */ 4150 for (i = 0; i < server->auth_info.flavor_len; i++) { 4151 status = nfs4_lookup_root_sec(server, fhandle, info, 4152 server->auth_info.flavors[i]); 4153 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4154 continue; 4155 break; 4156 } 4157 } else { 4158 /* no flavors specified by user, try default list */ 4159 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4160 status = nfs4_lookup_root_sec(server, fhandle, info, 4161 flav_array[i]); 4162 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4163 continue; 4164 break; 4165 } 4166 } 4167 4168 /* 4169 * -EACCES could mean that the user doesn't have correct permissions 4170 * to access the mount. It could also mean that we tried to mount 4171 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4172 * existing mount programs don't handle -EACCES very well so it should 4173 * be mapped to -EPERM instead. 4174 */ 4175 if (status == -EACCES) 4176 status = -EPERM; 4177 return status; 4178 } 4179 4180 /** 4181 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4182 * @server: initialized nfs_server handle 4183 * @fhandle: we fill in the pseudo-fs root file handle 4184 * @info: we fill in an FSINFO struct 4185 * @auth_probe: probe the auth flavours 4186 * 4187 * Returns zero on success, or a negative errno. 4188 */ 4189 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4190 struct nfs_fsinfo *info, 4191 bool auth_probe) 4192 { 4193 int status = 0; 4194 4195 if (!auth_probe) 4196 status = nfs4_lookup_root(server, fhandle, info); 4197 4198 if (auth_probe || status == NFS4ERR_WRONGSEC) 4199 status = server->nfs_client->cl_mvops->find_root_sec(server, 4200 fhandle, info); 4201 4202 if (status == 0) 4203 status = nfs4_server_capabilities(server, fhandle); 4204 if (status == 0) 4205 status = nfs4_do_fsinfo(server, fhandle, info); 4206 4207 return nfs4_map_errors(status); 4208 } 4209 4210 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4211 struct nfs_fsinfo *info) 4212 { 4213 int error; 4214 struct nfs_fattr *fattr = info->fattr; 4215 4216 error = nfs4_server_capabilities(server, mntfh); 4217 if (error < 0) { 4218 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4219 return error; 4220 } 4221 4222 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4223 if (error < 0) { 4224 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4225 goto out; 4226 } 4227 4228 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4229 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4230 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4231 4232 out: 4233 return error; 4234 } 4235 4236 /* 4237 * Get locations and (maybe) other attributes of a referral. 4238 * Note that we'll actually follow the referral later when 4239 * we detect fsid mismatch in inode revalidation 4240 */ 4241 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4242 const struct qstr *name, struct nfs_fattr *fattr, 4243 struct nfs_fh *fhandle) 4244 { 4245 int status = -ENOMEM; 4246 struct page *page = NULL; 4247 struct nfs4_fs_locations *locations = NULL; 4248 4249 page = alloc_page(GFP_KERNEL); 4250 if (page == NULL) 4251 goto out; 4252 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4253 if (locations == NULL) 4254 goto out; 4255 4256 locations->fattr = fattr; 4257 4258 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4259 if (status != 0) 4260 goto out; 4261 4262 /* 4263 * If the fsid didn't change, this is a migration event, not a 4264 * referral. Cause us to drop into the exception handler, which 4265 * will kick off migration recovery. 4266 */ 4267 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4268 dprintk("%s: server did not return a different fsid for" 4269 " a referral at %s\n", __func__, name->name); 4270 status = -NFS4ERR_MOVED; 4271 goto out; 4272 } 4273 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4274 nfs_fixup_referral_attributes(fattr); 4275 memset(fhandle, 0, sizeof(struct nfs_fh)); 4276 out: 4277 if (page) 4278 __free_page(page); 4279 kfree(locations); 4280 return status; 4281 } 4282 4283 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4284 struct nfs_fattr *fattr, struct inode *inode) 4285 { 4286 __u32 bitmask[NFS4_BITMASK_SZ]; 4287 struct nfs4_getattr_arg args = { 4288 .fh = fhandle, 4289 .bitmask = bitmask, 4290 }; 4291 struct nfs4_getattr_res res = { 4292 .fattr = fattr, 4293 .server = server, 4294 }; 4295 struct rpc_message msg = { 4296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4297 .rpc_argp = &args, 4298 .rpc_resp = &res, 4299 }; 4300 unsigned short task_flags = 0; 4301 4302 if (nfs4_has_session(server->nfs_client)) 4303 task_flags = RPC_TASK_MOVEABLE; 4304 4305 /* Is this is an attribute revalidation, subject to softreval? */ 4306 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4307 task_flags |= RPC_TASK_TIMEOUT; 4308 4309 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4310 nfs_fattr_init(fattr); 4311 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4312 return nfs4_do_call_sync(server->client, server, &msg, 4313 &args.seq_args, &res.seq_res, task_flags); 4314 } 4315 4316 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4317 struct nfs_fattr *fattr, struct inode *inode) 4318 { 4319 struct nfs4_exception exception = { 4320 .interruptible = true, 4321 }; 4322 int err; 4323 do { 4324 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4325 trace_nfs4_getattr(server, fhandle, fattr, err); 4326 err = nfs4_handle_exception(server, err, 4327 &exception); 4328 } while (exception.retry); 4329 return err; 4330 } 4331 4332 /* 4333 * The file is not closed if it is opened due to the a request to change 4334 * the size of the file. The open call will not be needed once the 4335 * VFS layer lookup-intents are implemented. 4336 * 4337 * Close is called when the inode is destroyed. 4338 * If we haven't opened the file for O_WRONLY, we 4339 * need to in the size_change case to obtain a stateid. 4340 * 4341 * Got race? 4342 * Because OPEN is always done by name in nfsv4, it is 4343 * possible that we opened a different file by the same 4344 * name. We can recognize this race condition, but we 4345 * can't do anything about it besides returning an error. 4346 * 4347 * This will be fixed with VFS changes (lookup-intent). 4348 */ 4349 static int 4350 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4351 struct iattr *sattr) 4352 { 4353 struct inode *inode = d_inode(dentry); 4354 const struct cred *cred = NULL; 4355 struct nfs_open_context *ctx = NULL; 4356 int status; 4357 4358 if (pnfs_ld_layoutret_on_setattr(inode) && 4359 sattr->ia_valid & ATTR_SIZE && 4360 sattr->ia_size < i_size_read(inode)) 4361 pnfs_commit_and_return_layout(inode); 4362 4363 nfs_fattr_init(fattr); 4364 4365 /* Deal with open(O_TRUNC) */ 4366 if (sattr->ia_valid & ATTR_OPEN) 4367 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4368 4369 /* Optimization: if the end result is no change, don't RPC */ 4370 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4371 return 0; 4372 4373 /* Search for an existing open(O_WRITE) file */ 4374 if (sattr->ia_valid & ATTR_FILE) { 4375 4376 ctx = nfs_file_open_context(sattr->ia_file); 4377 if (ctx) 4378 cred = ctx->cred; 4379 } 4380 4381 /* Return any delegations if we're going to change ACLs */ 4382 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4383 nfs4_inode_make_writeable(inode); 4384 4385 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4386 if (status == 0) { 4387 nfs_setattr_update_inode(inode, sattr, fattr); 4388 nfs_setsecurity(inode, fattr); 4389 } 4390 return status; 4391 } 4392 4393 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4394 struct dentry *dentry, struct nfs_fh *fhandle, 4395 struct nfs_fattr *fattr) 4396 { 4397 struct nfs_server *server = NFS_SERVER(dir); 4398 int status; 4399 struct nfs4_lookup_arg args = { 4400 .bitmask = server->attr_bitmask, 4401 .dir_fh = NFS_FH(dir), 4402 .name = &dentry->d_name, 4403 }; 4404 struct nfs4_lookup_res res = { 4405 .server = server, 4406 .fattr = fattr, 4407 .fh = fhandle, 4408 }; 4409 struct rpc_message msg = { 4410 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4411 .rpc_argp = &args, 4412 .rpc_resp = &res, 4413 }; 4414 unsigned short task_flags = 0; 4415 4416 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4417 task_flags = RPC_TASK_MOVEABLE; 4418 4419 /* Is this is an attribute revalidation, subject to softreval? */ 4420 if (nfs_lookup_is_soft_revalidate(dentry)) 4421 task_flags |= RPC_TASK_TIMEOUT; 4422 4423 args.bitmask = nfs4_bitmask(server, fattr->label); 4424 4425 nfs_fattr_init(fattr); 4426 4427 dprintk("NFS call lookup %pd2\n", dentry); 4428 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4429 status = nfs4_do_call_sync(clnt, server, &msg, 4430 &args.seq_args, &res.seq_res, task_flags); 4431 dprintk("NFS reply lookup: %d\n", status); 4432 return status; 4433 } 4434 4435 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4436 { 4437 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4438 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4439 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4440 fattr->nlink = 2; 4441 } 4442 4443 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4444 struct dentry *dentry, struct nfs_fh *fhandle, 4445 struct nfs_fattr *fattr) 4446 { 4447 struct nfs4_exception exception = { 4448 .interruptible = true, 4449 }; 4450 struct rpc_clnt *client = *clnt; 4451 const struct qstr *name = &dentry->d_name; 4452 int err; 4453 do { 4454 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4455 trace_nfs4_lookup(dir, name, err); 4456 switch (err) { 4457 case -NFS4ERR_BADNAME: 4458 err = -ENOENT; 4459 goto out; 4460 case -NFS4ERR_MOVED: 4461 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4462 if (err == -NFS4ERR_MOVED) 4463 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4464 goto out; 4465 case -NFS4ERR_WRONGSEC: 4466 err = -EPERM; 4467 if (client != *clnt) 4468 goto out; 4469 client = nfs4_negotiate_security(client, dir, name); 4470 if (IS_ERR(client)) 4471 return PTR_ERR(client); 4472 4473 exception.retry = 1; 4474 break; 4475 default: 4476 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4477 } 4478 } while (exception.retry); 4479 4480 out: 4481 if (err == 0) 4482 *clnt = client; 4483 else if (client != *clnt) 4484 rpc_shutdown_client(client); 4485 4486 return err; 4487 } 4488 4489 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4490 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4491 { 4492 int status; 4493 struct rpc_clnt *client = NFS_CLIENT(dir); 4494 4495 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4496 if (client != NFS_CLIENT(dir)) { 4497 rpc_shutdown_client(client); 4498 nfs_fixup_secinfo_attributes(fattr); 4499 } 4500 return status; 4501 } 4502 4503 struct rpc_clnt * 4504 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4505 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4506 { 4507 struct rpc_clnt *client = NFS_CLIENT(dir); 4508 int status; 4509 4510 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4511 if (status < 0) 4512 return ERR_PTR(status); 4513 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4514 } 4515 4516 static int _nfs4_proc_lookupp(struct inode *inode, 4517 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4518 { 4519 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4520 struct nfs_server *server = NFS_SERVER(inode); 4521 int status; 4522 struct nfs4_lookupp_arg args = { 4523 .bitmask = server->attr_bitmask, 4524 .fh = NFS_FH(inode), 4525 }; 4526 struct nfs4_lookupp_res res = { 4527 .server = server, 4528 .fattr = fattr, 4529 .fh = fhandle, 4530 }; 4531 struct rpc_message msg = { 4532 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4533 .rpc_argp = &args, 4534 .rpc_resp = &res, 4535 }; 4536 unsigned short task_flags = 0; 4537 4538 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4539 task_flags |= RPC_TASK_TIMEOUT; 4540 4541 args.bitmask = nfs4_bitmask(server, fattr->label); 4542 4543 nfs_fattr_init(fattr); 4544 4545 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4546 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4547 &res.seq_res, task_flags); 4548 dprintk("NFS reply lookupp: %d\n", status); 4549 return status; 4550 } 4551 4552 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4553 struct nfs_fattr *fattr) 4554 { 4555 struct nfs4_exception exception = { 4556 .interruptible = true, 4557 }; 4558 int err; 4559 do { 4560 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4561 trace_nfs4_lookupp(inode, err); 4562 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4563 &exception); 4564 } while (exception.retry); 4565 return err; 4566 } 4567 4568 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4569 const struct cred *cred) 4570 { 4571 struct nfs_server *server = NFS_SERVER(inode); 4572 struct nfs4_accessargs args = { 4573 .fh = NFS_FH(inode), 4574 .access = entry->mask, 4575 }; 4576 struct nfs4_accessres res = { 4577 .server = server, 4578 }; 4579 struct rpc_message msg = { 4580 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4581 .rpc_argp = &args, 4582 .rpc_resp = &res, 4583 .rpc_cred = cred, 4584 }; 4585 int status = 0; 4586 4587 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4588 res.fattr = nfs_alloc_fattr(); 4589 if (res.fattr == NULL) 4590 return -ENOMEM; 4591 args.bitmask = server->cache_consistency_bitmask; 4592 } 4593 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4594 if (!status) { 4595 nfs_access_set_mask(entry, res.access); 4596 if (res.fattr) 4597 nfs_refresh_inode(inode, res.fattr); 4598 } 4599 nfs_free_fattr(res.fattr); 4600 return status; 4601 } 4602 4603 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4604 const struct cred *cred) 4605 { 4606 struct nfs4_exception exception = { 4607 .interruptible = true, 4608 }; 4609 int err; 4610 do { 4611 err = _nfs4_proc_access(inode, entry, cred); 4612 trace_nfs4_access(inode, err); 4613 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4614 &exception); 4615 } while (exception.retry); 4616 return err; 4617 } 4618 4619 /* 4620 * TODO: For the time being, we don't try to get any attributes 4621 * along with any of the zero-copy operations READ, READDIR, 4622 * READLINK, WRITE. 4623 * 4624 * In the case of the first three, we want to put the GETATTR 4625 * after the read-type operation -- this is because it is hard 4626 * to predict the length of a GETATTR response in v4, and thus 4627 * align the READ data correctly. This means that the GETATTR 4628 * may end up partially falling into the page cache, and we should 4629 * shift it into the 'tail' of the xdr_buf before processing. 4630 * To do this efficiently, we need to know the total length 4631 * of data received, which doesn't seem to be available outside 4632 * of the RPC layer. 4633 * 4634 * In the case of WRITE, we also want to put the GETATTR after 4635 * the operation -- in this case because we want to make sure 4636 * we get the post-operation mtime and size. 4637 * 4638 * Both of these changes to the XDR layer would in fact be quite 4639 * minor, but I decided to leave them for a subsequent patch. 4640 */ 4641 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4642 unsigned int pgbase, unsigned int pglen) 4643 { 4644 struct nfs4_readlink args = { 4645 .fh = NFS_FH(inode), 4646 .pgbase = pgbase, 4647 .pglen = pglen, 4648 .pages = &page, 4649 }; 4650 struct nfs4_readlink_res res; 4651 struct rpc_message msg = { 4652 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4653 .rpc_argp = &args, 4654 .rpc_resp = &res, 4655 }; 4656 4657 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4658 } 4659 4660 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4661 unsigned int pgbase, unsigned int pglen) 4662 { 4663 struct nfs4_exception exception = { 4664 .interruptible = true, 4665 }; 4666 int err; 4667 do { 4668 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4669 trace_nfs4_readlink(inode, err); 4670 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4671 &exception); 4672 } while (exception.retry); 4673 return err; 4674 } 4675 4676 /* 4677 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4678 */ 4679 static int 4680 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4681 int flags) 4682 { 4683 struct nfs_server *server = NFS_SERVER(dir); 4684 struct nfs4_label l, *ilabel = NULL; 4685 struct nfs_open_context *ctx; 4686 struct nfs4_state *state; 4687 int status = 0; 4688 4689 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4690 if (IS_ERR(ctx)) 4691 return PTR_ERR(ctx); 4692 4693 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4694 4695 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4696 sattr->ia_mode &= ~current_umask(); 4697 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4698 if (IS_ERR(state)) { 4699 status = PTR_ERR(state); 4700 goto out; 4701 } 4702 out: 4703 nfs4_label_release_security(ilabel); 4704 put_nfs_open_context(ctx); 4705 return status; 4706 } 4707 4708 static int 4709 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4710 { 4711 struct nfs_server *server = NFS_SERVER(dir); 4712 struct nfs_removeargs args = { 4713 .fh = NFS_FH(dir), 4714 .name = *name, 4715 }; 4716 struct nfs_removeres res = { 4717 .server = server, 4718 }; 4719 struct rpc_message msg = { 4720 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4721 .rpc_argp = &args, 4722 .rpc_resp = &res, 4723 }; 4724 unsigned long timestamp = jiffies; 4725 int status; 4726 4727 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4728 if (status == 0) { 4729 spin_lock(&dir->i_lock); 4730 /* Removing a directory decrements nlink in the parent */ 4731 if (ftype == NF4DIR && dir->i_nlink > 2) 4732 nfs4_dec_nlink_locked(dir); 4733 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4734 NFS_INO_INVALID_DATA); 4735 spin_unlock(&dir->i_lock); 4736 } 4737 return status; 4738 } 4739 4740 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4741 { 4742 struct nfs4_exception exception = { 4743 .interruptible = true, 4744 }; 4745 struct inode *inode = d_inode(dentry); 4746 int err; 4747 4748 if (inode) { 4749 if (inode->i_nlink == 1) 4750 nfs4_inode_return_delegation(inode); 4751 else 4752 nfs4_inode_make_writeable(inode); 4753 } 4754 do { 4755 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4756 trace_nfs4_remove(dir, &dentry->d_name, err); 4757 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4758 &exception); 4759 } while (exception.retry); 4760 return err; 4761 } 4762 4763 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4764 { 4765 struct nfs4_exception exception = { 4766 .interruptible = true, 4767 }; 4768 int err; 4769 4770 do { 4771 err = _nfs4_proc_remove(dir, name, NF4DIR); 4772 trace_nfs4_remove(dir, name, err); 4773 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4774 &exception); 4775 } while (exception.retry); 4776 return err; 4777 } 4778 4779 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4780 struct dentry *dentry, 4781 struct inode *inode) 4782 { 4783 struct nfs_removeargs *args = msg->rpc_argp; 4784 struct nfs_removeres *res = msg->rpc_resp; 4785 4786 res->server = NFS_SB(dentry->d_sb); 4787 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4788 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4789 4790 nfs_fattr_init(res->dir_attr); 4791 4792 if (inode) { 4793 nfs4_inode_return_delegation(inode); 4794 nfs_d_prune_case_insensitive_aliases(inode); 4795 } 4796 } 4797 4798 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4799 { 4800 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4801 &data->args.seq_args, 4802 &data->res.seq_res, 4803 task); 4804 } 4805 4806 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4807 { 4808 struct nfs_unlinkdata *data = task->tk_calldata; 4809 struct nfs_removeres *res = &data->res; 4810 4811 if (!nfs4_sequence_done(task, &res->seq_res)) 4812 return 0; 4813 if (nfs4_async_handle_error(task, res->server, NULL, 4814 &data->timeout) == -EAGAIN) 4815 return 0; 4816 if (task->tk_status == 0) 4817 nfs4_update_changeattr(dir, &res->cinfo, 4818 res->dir_attr->time_start, 4819 NFS_INO_INVALID_DATA); 4820 return 1; 4821 } 4822 4823 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4824 struct dentry *old_dentry, 4825 struct dentry *new_dentry) 4826 { 4827 struct nfs_renameargs *arg = msg->rpc_argp; 4828 struct nfs_renameres *res = msg->rpc_resp; 4829 struct inode *old_inode = d_inode(old_dentry); 4830 struct inode *new_inode = d_inode(new_dentry); 4831 4832 if (old_inode) 4833 nfs4_inode_make_writeable(old_inode); 4834 if (new_inode) 4835 nfs4_inode_return_delegation(new_inode); 4836 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4837 res->server = NFS_SB(old_dentry->d_sb); 4838 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4839 } 4840 4841 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4842 { 4843 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4844 &data->args.seq_args, 4845 &data->res.seq_res, 4846 task); 4847 } 4848 4849 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4850 struct inode *new_dir) 4851 { 4852 struct nfs_renamedata *data = task->tk_calldata; 4853 struct nfs_renameres *res = &data->res; 4854 4855 if (!nfs4_sequence_done(task, &res->seq_res)) 4856 return 0; 4857 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4858 return 0; 4859 4860 if (task->tk_status == 0) { 4861 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4862 if (new_dir != old_dir) { 4863 /* Note: If we moved a directory, nlink will change */ 4864 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4865 res->old_fattr->time_start, 4866 NFS_INO_INVALID_NLINK | 4867 NFS_INO_INVALID_DATA); 4868 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4869 res->new_fattr->time_start, 4870 NFS_INO_INVALID_NLINK | 4871 NFS_INO_INVALID_DATA); 4872 } else 4873 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4874 res->old_fattr->time_start, 4875 NFS_INO_INVALID_DATA); 4876 } 4877 return 1; 4878 } 4879 4880 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4881 { 4882 struct nfs_server *server = NFS_SERVER(inode); 4883 __u32 bitmask[NFS4_BITMASK_SZ]; 4884 struct nfs4_link_arg arg = { 4885 .fh = NFS_FH(inode), 4886 .dir_fh = NFS_FH(dir), 4887 .name = name, 4888 .bitmask = bitmask, 4889 }; 4890 struct nfs4_link_res res = { 4891 .server = server, 4892 }; 4893 struct rpc_message msg = { 4894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4895 .rpc_argp = &arg, 4896 .rpc_resp = &res, 4897 }; 4898 int status = -ENOMEM; 4899 4900 res.fattr = nfs_alloc_fattr_with_label(server); 4901 if (res.fattr == NULL) 4902 goto out; 4903 4904 nfs4_inode_make_writeable(inode); 4905 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4906 NFS_INO_INVALID_CHANGE); 4907 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4908 if (!status) { 4909 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4910 NFS_INO_INVALID_DATA); 4911 nfs4_inc_nlink(inode); 4912 status = nfs_post_op_update_inode(inode, res.fattr); 4913 if (!status) 4914 nfs_setsecurity(inode, res.fattr); 4915 } 4916 4917 out: 4918 nfs_free_fattr(res.fattr); 4919 return status; 4920 } 4921 4922 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4923 { 4924 struct nfs4_exception exception = { 4925 .interruptible = true, 4926 }; 4927 int err; 4928 do { 4929 err = nfs4_handle_exception(NFS_SERVER(inode), 4930 _nfs4_proc_link(inode, dir, name), 4931 &exception); 4932 } while (exception.retry); 4933 return err; 4934 } 4935 4936 struct nfs4_createdata { 4937 struct rpc_message msg; 4938 struct nfs4_create_arg arg; 4939 struct nfs4_create_res res; 4940 struct nfs_fh fh; 4941 struct nfs_fattr fattr; 4942 }; 4943 4944 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4945 const struct qstr *name, struct iattr *sattr, u32 ftype) 4946 { 4947 struct nfs4_createdata *data; 4948 4949 data = kzalloc(sizeof(*data), GFP_KERNEL); 4950 if (data != NULL) { 4951 struct nfs_server *server = NFS_SERVER(dir); 4952 4953 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4954 if (IS_ERR(data->fattr.label)) 4955 goto out_free; 4956 4957 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4958 data->msg.rpc_argp = &data->arg; 4959 data->msg.rpc_resp = &data->res; 4960 data->arg.dir_fh = NFS_FH(dir); 4961 data->arg.server = server; 4962 data->arg.name = name; 4963 data->arg.attrs = sattr; 4964 data->arg.ftype = ftype; 4965 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4966 data->arg.umask = current_umask(); 4967 data->res.server = server; 4968 data->res.fh = &data->fh; 4969 data->res.fattr = &data->fattr; 4970 nfs_fattr_init(data->res.fattr); 4971 } 4972 return data; 4973 out_free: 4974 kfree(data); 4975 return NULL; 4976 } 4977 4978 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4979 { 4980 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4981 &data->arg.seq_args, &data->res.seq_res, 1); 4982 if (status == 0) { 4983 spin_lock(&dir->i_lock); 4984 /* Creating a directory bumps nlink in the parent */ 4985 if (data->arg.ftype == NF4DIR) 4986 nfs4_inc_nlink_locked(dir); 4987 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4988 data->res.fattr->time_start, 4989 NFS_INO_INVALID_DATA); 4990 spin_unlock(&dir->i_lock); 4991 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 4992 } 4993 return status; 4994 } 4995 4996 static void nfs4_free_createdata(struct nfs4_createdata *data) 4997 { 4998 nfs4_label_free(data->fattr.label); 4999 kfree(data); 5000 } 5001 5002 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5003 struct page *page, unsigned int len, struct iattr *sattr, 5004 struct nfs4_label *label) 5005 { 5006 struct nfs4_createdata *data; 5007 int status = -ENAMETOOLONG; 5008 5009 if (len > NFS4_MAXPATHLEN) 5010 goto out; 5011 5012 status = -ENOMEM; 5013 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5014 if (data == NULL) 5015 goto out; 5016 5017 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5018 data->arg.u.symlink.pages = &page; 5019 data->arg.u.symlink.len = len; 5020 data->arg.label = label; 5021 5022 status = nfs4_do_create(dir, dentry, data); 5023 5024 nfs4_free_createdata(data); 5025 out: 5026 return status; 5027 } 5028 5029 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5030 struct page *page, unsigned int len, struct iattr *sattr) 5031 { 5032 struct nfs4_exception exception = { 5033 .interruptible = true, 5034 }; 5035 struct nfs4_label l, *label = NULL; 5036 int err; 5037 5038 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5039 5040 do { 5041 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5042 trace_nfs4_symlink(dir, &dentry->d_name, err); 5043 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5044 &exception); 5045 } while (exception.retry); 5046 5047 nfs4_label_release_security(label); 5048 return err; 5049 } 5050 5051 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5052 struct iattr *sattr, struct nfs4_label *label) 5053 { 5054 struct nfs4_createdata *data; 5055 int status = -ENOMEM; 5056 5057 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5058 if (data == NULL) 5059 goto out; 5060 5061 data->arg.label = label; 5062 status = nfs4_do_create(dir, dentry, data); 5063 5064 nfs4_free_createdata(data); 5065 out: 5066 return status; 5067 } 5068 5069 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5070 struct iattr *sattr) 5071 { 5072 struct nfs_server *server = NFS_SERVER(dir); 5073 struct nfs4_exception exception = { 5074 .interruptible = true, 5075 }; 5076 struct nfs4_label l, *label = NULL; 5077 int err; 5078 5079 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5080 5081 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5082 sattr->ia_mode &= ~current_umask(); 5083 do { 5084 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5085 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5086 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5087 &exception); 5088 } while (exception.retry); 5089 nfs4_label_release_security(label); 5090 5091 return err; 5092 } 5093 5094 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5095 struct nfs_readdir_res *nr_res) 5096 { 5097 struct inode *dir = d_inode(nr_arg->dentry); 5098 struct nfs_server *server = NFS_SERVER(dir); 5099 struct nfs4_readdir_arg args = { 5100 .fh = NFS_FH(dir), 5101 .pages = nr_arg->pages, 5102 .pgbase = 0, 5103 .count = nr_arg->page_len, 5104 .plus = nr_arg->plus, 5105 }; 5106 struct nfs4_readdir_res res; 5107 struct rpc_message msg = { 5108 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5109 .rpc_argp = &args, 5110 .rpc_resp = &res, 5111 .rpc_cred = nr_arg->cred, 5112 }; 5113 int status; 5114 5115 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5116 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5117 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5118 args.bitmask = server->attr_bitmask_nl; 5119 else 5120 args.bitmask = server->attr_bitmask; 5121 5122 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5123 res.pgbase = args.pgbase; 5124 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5125 &res.seq_res, 0); 5126 if (status >= 0) { 5127 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5128 status += args.pgbase; 5129 } 5130 5131 nfs_invalidate_atime(dir); 5132 5133 dprintk("%s: returns %d\n", __func__, status); 5134 return status; 5135 } 5136 5137 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5138 struct nfs_readdir_res *res) 5139 { 5140 struct nfs4_exception exception = { 5141 .interruptible = true, 5142 }; 5143 int err; 5144 do { 5145 err = _nfs4_proc_readdir(arg, res); 5146 trace_nfs4_readdir(d_inode(arg->dentry), err); 5147 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5148 err, &exception); 5149 } while (exception.retry); 5150 return err; 5151 } 5152 5153 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5154 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5155 { 5156 struct nfs4_createdata *data; 5157 int mode = sattr->ia_mode; 5158 int status = -ENOMEM; 5159 5160 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5161 if (data == NULL) 5162 goto out; 5163 5164 if (S_ISFIFO(mode)) 5165 data->arg.ftype = NF4FIFO; 5166 else if (S_ISBLK(mode)) { 5167 data->arg.ftype = NF4BLK; 5168 data->arg.u.device.specdata1 = MAJOR(rdev); 5169 data->arg.u.device.specdata2 = MINOR(rdev); 5170 } 5171 else if (S_ISCHR(mode)) { 5172 data->arg.ftype = NF4CHR; 5173 data->arg.u.device.specdata1 = MAJOR(rdev); 5174 data->arg.u.device.specdata2 = MINOR(rdev); 5175 } else if (!S_ISSOCK(mode)) { 5176 status = -EINVAL; 5177 goto out_free; 5178 } 5179 5180 data->arg.label = label; 5181 status = nfs4_do_create(dir, dentry, data); 5182 out_free: 5183 nfs4_free_createdata(data); 5184 out: 5185 return status; 5186 } 5187 5188 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5189 struct iattr *sattr, dev_t rdev) 5190 { 5191 struct nfs_server *server = NFS_SERVER(dir); 5192 struct nfs4_exception exception = { 5193 .interruptible = true, 5194 }; 5195 struct nfs4_label l, *label = NULL; 5196 int err; 5197 5198 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5199 5200 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5201 sattr->ia_mode &= ~current_umask(); 5202 do { 5203 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5204 trace_nfs4_mknod(dir, &dentry->d_name, err); 5205 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5206 &exception); 5207 } while (exception.retry); 5208 5209 nfs4_label_release_security(label); 5210 5211 return err; 5212 } 5213 5214 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5215 struct nfs_fsstat *fsstat) 5216 { 5217 struct nfs4_statfs_arg args = { 5218 .fh = fhandle, 5219 .bitmask = server->attr_bitmask, 5220 }; 5221 struct nfs4_statfs_res res = { 5222 .fsstat = fsstat, 5223 }; 5224 struct rpc_message msg = { 5225 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5226 .rpc_argp = &args, 5227 .rpc_resp = &res, 5228 }; 5229 5230 nfs_fattr_init(fsstat->fattr); 5231 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5232 } 5233 5234 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5235 { 5236 struct nfs4_exception exception = { 5237 .interruptible = true, 5238 }; 5239 int err; 5240 do { 5241 err = nfs4_handle_exception(server, 5242 _nfs4_proc_statfs(server, fhandle, fsstat), 5243 &exception); 5244 } while (exception.retry); 5245 return err; 5246 } 5247 5248 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5249 struct nfs_fsinfo *fsinfo) 5250 { 5251 struct nfs4_fsinfo_arg args = { 5252 .fh = fhandle, 5253 .bitmask = server->attr_bitmask, 5254 }; 5255 struct nfs4_fsinfo_res res = { 5256 .fsinfo = fsinfo, 5257 }; 5258 struct rpc_message msg = { 5259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5260 .rpc_argp = &args, 5261 .rpc_resp = &res, 5262 }; 5263 5264 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5265 } 5266 5267 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5268 { 5269 struct nfs4_exception exception = { 5270 .interruptible = true, 5271 }; 5272 int err; 5273 5274 do { 5275 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5276 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5277 if (err == 0) { 5278 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5279 break; 5280 } 5281 err = nfs4_handle_exception(server, err, &exception); 5282 } while (exception.retry); 5283 return err; 5284 } 5285 5286 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5287 { 5288 int error; 5289 5290 nfs_fattr_init(fsinfo->fattr); 5291 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5292 if (error == 0) { 5293 /* block layout checks this! */ 5294 server->pnfs_blksize = fsinfo->blksize; 5295 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5296 } 5297 5298 return error; 5299 } 5300 5301 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5302 struct nfs_pathconf *pathconf) 5303 { 5304 struct nfs4_pathconf_arg args = { 5305 .fh = fhandle, 5306 .bitmask = server->attr_bitmask, 5307 }; 5308 struct nfs4_pathconf_res res = { 5309 .pathconf = pathconf, 5310 }; 5311 struct rpc_message msg = { 5312 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5313 .rpc_argp = &args, 5314 .rpc_resp = &res, 5315 }; 5316 5317 /* None of the pathconf attributes are mandatory to implement */ 5318 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5319 memset(pathconf, 0, sizeof(*pathconf)); 5320 return 0; 5321 } 5322 5323 nfs_fattr_init(pathconf->fattr); 5324 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5325 } 5326 5327 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5328 struct nfs_pathconf *pathconf) 5329 { 5330 struct nfs4_exception exception = { 5331 .interruptible = true, 5332 }; 5333 int err; 5334 5335 do { 5336 err = nfs4_handle_exception(server, 5337 _nfs4_proc_pathconf(server, fhandle, pathconf), 5338 &exception); 5339 } while (exception.retry); 5340 return err; 5341 } 5342 5343 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5344 const struct nfs_open_context *ctx, 5345 const struct nfs_lock_context *l_ctx, 5346 fmode_t fmode) 5347 { 5348 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5349 } 5350 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5351 5352 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5353 const struct nfs_open_context *ctx, 5354 const struct nfs_lock_context *l_ctx, 5355 fmode_t fmode) 5356 { 5357 nfs4_stateid _current_stateid; 5358 5359 /* If the current stateid represents a lost lock, then exit */ 5360 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5361 return true; 5362 return nfs4_stateid_match(stateid, &_current_stateid); 5363 } 5364 5365 static bool nfs4_error_stateid_expired(int err) 5366 { 5367 switch (err) { 5368 case -NFS4ERR_DELEG_REVOKED: 5369 case -NFS4ERR_ADMIN_REVOKED: 5370 case -NFS4ERR_BAD_STATEID: 5371 case -NFS4ERR_STALE_STATEID: 5372 case -NFS4ERR_OLD_STATEID: 5373 case -NFS4ERR_OPENMODE: 5374 case -NFS4ERR_EXPIRED: 5375 return true; 5376 } 5377 return false; 5378 } 5379 5380 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5381 { 5382 struct nfs_server *server = NFS_SERVER(hdr->inode); 5383 5384 trace_nfs4_read(hdr, task->tk_status); 5385 if (task->tk_status < 0) { 5386 struct nfs4_exception exception = { 5387 .inode = hdr->inode, 5388 .state = hdr->args.context->state, 5389 .stateid = &hdr->args.stateid, 5390 }; 5391 task->tk_status = nfs4_async_handle_exception(task, 5392 server, task->tk_status, &exception); 5393 if (exception.retry) { 5394 rpc_restart_call_prepare(task); 5395 return -EAGAIN; 5396 } 5397 } 5398 5399 if (task->tk_status > 0) 5400 renew_lease(server, hdr->timestamp); 5401 return 0; 5402 } 5403 5404 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5405 struct nfs_pgio_args *args) 5406 { 5407 5408 if (!nfs4_error_stateid_expired(task->tk_status) || 5409 nfs4_stateid_is_current(&args->stateid, 5410 args->context, 5411 args->lock_context, 5412 FMODE_READ)) 5413 return false; 5414 rpc_restart_call_prepare(task); 5415 return true; 5416 } 5417 5418 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5419 struct nfs_pgio_header *hdr) 5420 { 5421 struct nfs_server *server = NFS_SERVER(hdr->inode); 5422 struct rpc_message *msg = &task->tk_msg; 5423 5424 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5425 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5426 server->caps &= ~NFS_CAP_READ_PLUS; 5427 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5428 rpc_restart_call_prepare(task); 5429 return true; 5430 } 5431 return false; 5432 } 5433 5434 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5435 { 5436 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5437 return -EAGAIN; 5438 if (nfs4_read_stateid_changed(task, &hdr->args)) 5439 return -EAGAIN; 5440 if (nfs4_read_plus_not_supported(task, hdr)) 5441 return -EAGAIN; 5442 if (task->tk_status > 0) 5443 nfs_invalidate_atime(hdr->inode); 5444 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5445 nfs4_read_done_cb(task, hdr); 5446 } 5447 5448 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5449 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5450 struct rpc_message *msg) 5451 { 5452 /* Note: We don't use READ_PLUS with pNFS yet */ 5453 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) 5454 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5455 } 5456 #else 5457 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5458 struct rpc_message *msg) 5459 { 5460 } 5461 #endif /* CONFIG_NFS_V4_2 */ 5462 5463 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5464 struct rpc_message *msg) 5465 { 5466 hdr->timestamp = jiffies; 5467 if (!hdr->pgio_done_cb) 5468 hdr->pgio_done_cb = nfs4_read_done_cb; 5469 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5470 nfs42_read_plus_support(hdr, msg); 5471 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5472 } 5473 5474 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5475 struct nfs_pgio_header *hdr) 5476 { 5477 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5478 &hdr->args.seq_args, 5479 &hdr->res.seq_res, 5480 task)) 5481 return 0; 5482 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5483 hdr->args.lock_context, 5484 hdr->rw_mode) == -EIO) 5485 return -EIO; 5486 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5487 return -EIO; 5488 return 0; 5489 } 5490 5491 static int nfs4_write_done_cb(struct rpc_task *task, 5492 struct nfs_pgio_header *hdr) 5493 { 5494 struct inode *inode = hdr->inode; 5495 5496 trace_nfs4_write(hdr, task->tk_status); 5497 if (task->tk_status < 0) { 5498 struct nfs4_exception exception = { 5499 .inode = hdr->inode, 5500 .state = hdr->args.context->state, 5501 .stateid = &hdr->args.stateid, 5502 }; 5503 task->tk_status = nfs4_async_handle_exception(task, 5504 NFS_SERVER(inode), task->tk_status, 5505 &exception); 5506 if (exception.retry) { 5507 rpc_restart_call_prepare(task); 5508 return -EAGAIN; 5509 } 5510 } 5511 if (task->tk_status >= 0) { 5512 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5513 nfs_writeback_update_inode(hdr); 5514 } 5515 return 0; 5516 } 5517 5518 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5519 struct nfs_pgio_args *args) 5520 { 5521 5522 if (!nfs4_error_stateid_expired(task->tk_status) || 5523 nfs4_stateid_is_current(&args->stateid, 5524 args->context, 5525 args->lock_context, 5526 FMODE_WRITE)) 5527 return false; 5528 rpc_restart_call_prepare(task); 5529 return true; 5530 } 5531 5532 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5533 { 5534 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5535 return -EAGAIN; 5536 if (nfs4_write_stateid_changed(task, &hdr->args)) 5537 return -EAGAIN; 5538 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5539 nfs4_write_done_cb(task, hdr); 5540 } 5541 5542 static 5543 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5544 { 5545 /* Don't request attributes for pNFS or O_DIRECT writes */ 5546 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5547 return false; 5548 /* Otherwise, request attributes if and only if we don't hold 5549 * a delegation 5550 */ 5551 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5552 } 5553 5554 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5555 struct inode *inode, unsigned long cache_validity) 5556 { 5557 struct nfs_server *server = NFS_SERVER(inode); 5558 unsigned int i; 5559 5560 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5561 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5562 5563 if (cache_validity & NFS_INO_INVALID_CHANGE) 5564 bitmask[0] |= FATTR4_WORD0_CHANGE; 5565 if (cache_validity & NFS_INO_INVALID_ATIME) 5566 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5567 if (cache_validity & NFS_INO_INVALID_MODE) 5568 bitmask[1] |= FATTR4_WORD1_MODE; 5569 if (cache_validity & NFS_INO_INVALID_OTHER) 5570 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5571 if (cache_validity & NFS_INO_INVALID_NLINK) 5572 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5573 if (cache_validity & NFS_INO_INVALID_CTIME) 5574 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5575 if (cache_validity & NFS_INO_INVALID_MTIME) 5576 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5577 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5578 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5579 5580 if (cache_validity & NFS_INO_INVALID_SIZE) 5581 bitmask[0] |= FATTR4_WORD0_SIZE; 5582 5583 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5584 bitmask[i] &= server->attr_bitmask[i]; 5585 } 5586 5587 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5588 struct rpc_message *msg, 5589 struct rpc_clnt **clnt) 5590 { 5591 struct nfs_server *server = NFS_SERVER(hdr->inode); 5592 5593 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5594 hdr->args.bitmask = NULL; 5595 hdr->res.fattr = NULL; 5596 } else { 5597 nfs4_bitmask_set(hdr->args.bitmask_store, 5598 server->cache_consistency_bitmask, 5599 hdr->inode, NFS_INO_INVALID_BLOCKS); 5600 hdr->args.bitmask = hdr->args.bitmask_store; 5601 } 5602 5603 if (!hdr->pgio_done_cb) 5604 hdr->pgio_done_cb = nfs4_write_done_cb; 5605 hdr->res.server = server; 5606 hdr->timestamp = jiffies; 5607 5608 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5609 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5610 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5611 } 5612 5613 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5614 { 5615 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5616 &data->args.seq_args, 5617 &data->res.seq_res, 5618 task); 5619 } 5620 5621 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5622 { 5623 struct inode *inode = data->inode; 5624 5625 trace_nfs4_commit(data, task->tk_status); 5626 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5627 NULL, NULL) == -EAGAIN) { 5628 rpc_restart_call_prepare(task); 5629 return -EAGAIN; 5630 } 5631 return 0; 5632 } 5633 5634 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5635 { 5636 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5637 return -EAGAIN; 5638 return data->commit_done_cb(task, data); 5639 } 5640 5641 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5642 struct rpc_clnt **clnt) 5643 { 5644 struct nfs_server *server = NFS_SERVER(data->inode); 5645 5646 if (data->commit_done_cb == NULL) 5647 data->commit_done_cb = nfs4_commit_done_cb; 5648 data->res.server = server; 5649 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5650 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5651 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5652 } 5653 5654 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5655 struct nfs_commitres *res) 5656 { 5657 struct inode *dst_inode = file_inode(dst); 5658 struct nfs_server *server = NFS_SERVER(dst_inode); 5659 struct rpc_message msg = { 5660 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5661 .rpc_argp = args, 5662 .rpc_resp = res, 5663 }; 5664 5665 args->fh = NFS_FH(dst_inode); 5666 return nfs4_call_sync(server->client, server, &msg, 5667 &args->seq_args, &res->seq_res, 1); 5668 } 5669 5670 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5671 { 5672 struct nfs_commitargs args = { 5673 .offset = offset, 5674 .count = count, 5675 }; 5676 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5677 struct nfs4_exception exception = { }; 5678 int status; 5679 5680 do { 5681 status = _nfs4_proc_commit(dst, &args, res); 5682 status = nfs4_handle_exception(dst_server, status, &exception); 5683 } while (exception.retry); 5684 5685 return status; 5686 } 5687 5688 struct nfs4_renewdata { 5689 struct nfs_client *client; 5690 unsigned long timestamp; 5691 }; 5692 5693 /* 5694 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5695 * standalone procedure for queueing an asynchronous RENEW. 5696 */ 5697 static void nfs4_renew_release(void *calldata) 5698 { 5699 struct nfs4_renewdata *data = calldata; 5700 struct nfs_client *clp = data->client; 5701 5702 if (refcount_read(&clp->cl_count) > 1) 5703 nfs4_schedule_state_renewal(clp); 5704 nfs_put_client(clp); 5705 kfree(data); 5706 } 5707 5708 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5709 { 5710 struct nfs4_renewdata *data = calldata; 5711 struct nfs_client *clp = data->client; 5712 unsigned long timestamp = data->timestamp; 5713 5714 trace_nfs4_renew_async(clp, task->tk_status); 5715 switch (task->tk_status) { 5716 case 0: 5717 break; 5718 case -NFS4ERR_LEASE_MOVED: 5719 nfs4_schedule_lease_moved_recovery(clp); 5720 break; 5721 default: 5722 /* Unless we're shutting down, schedule state recovery! */ 5723 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5724 return; 5725 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5726 nfs4_schedule_lease_recovery(clp); 5727 return; 5728 } 5729 nfs4_schedule_path_down_recovery(clp); 5730 } 5731 do_renew_lease(clp, timestamp); 5732 } 5733 5734 static const struct rpc_call_ops nfs4_renew_ops = { 5735 .rpc_call_done = nfs4_renew_done, 5736 .rpc_release = nfs4_renew_release, 5737 }; 5738 5739 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5740 { 5741 struct rpc_message msg = { 5742 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5743 .rpc_argp = clp, 5744 .rpc_cred = cred, 5745 }; 5746 struct nfs4_renewdata *data; 5747 5748 if (renew_flags == 0) 5749 return 0; 5750 if (!refcount_inc_not_zero(&clp->cl_count)) 5751 return -EIO; 5752 data = kmalloc(sizeof(*data), GFP_NOFS); 5753 if (data == NULL) { 5754 nfs_put_client(clp); 5755 return -ENOMEM; 5756 } 5757 data->client = clp; 5758 data->timestamp = jiffies; 5759 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5760 &nfs4_renew_ops, data); 5761 } 5762 5763 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5764 { 5765 struct rpc_message msg = { 5766 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5767 .rpc_argp = clp, 5768 .rpc_cred = cred, 5769 }; 5770 unsigned long now = jiffies; 5771 int status; 5772 5773 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5774 if (status < 0) 5775 return status; 5776 do_renew_lease(clp, now); 5777 return 0; 5778 } 5779 5780 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5781 enum nfs4_acl_type type) 5782 { 5783 switch (type) { 5784 default: 5785 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5786 case NFS4ACL_DACL: 5787 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5788 case NFS4ACL_SACL: 5789 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5790 } 5791 } 5792 5793 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5794 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5795 * the stack. 5796 */ 5797 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5798 5799 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5800 struct page **pages) 5801 { 5802 struct page *newpage, **spages; 5803 int rc = 0; 5804 size_t len; 5805 spages = pages; 5806 5807 do { 5808 len = min_t(size_t, PAGE_SIZE, buflen); 5809 newpage = alloc_page(GFP_KERNEL); 5810 5811 if (newpage == NULL) 5812 goto unwind; 5813 memcpy(page_address(newpage), buf, len); 5814 buf += len; 5815 buflen -= len; 5816 *pages++ = newpage; 5817 rc++; 5818 } while (buflen != 0); 5819 5820 return rc; 5821 5822 unwind: 5823 for(; rc > 0; rc--) 5824 __free_page(spages[rc-1]); 5825 return -ENOMEM; 5826 } 5827 5828 struct nfs4_cached_acl { 5829 enum nfs4_acl_type type; 5830 int cached; 5831 size_t len; 5832 char data[]; 5833 }; 5834 5835 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5836 { 5837 struct nfs_inode *nfsi = NFS_I(inode); 5838 5839 spin_lock(&inode->i_lock); 5840 kfree(nfsi->nfs4_acl); 5841 nfsi->nfs4_acl = acl; 5842 spin_unlock(&inode->i_lock); 5843 } 5844 5845 static void nfs4_zap_acl_attr(struct inode *inode) 5846 { 5847 nfs4_set_cached_acl(inode, NULL); 5848 } 5849 5850 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5851 size_t buflen, enum nfs4_acl_type type) 5852 { 5853 struct nfs_inode *nfsi = NFS_I(inode); 5854 struct nfs4_cached_acl *acl; 5855 int ret = -ENOENT; 5856 5857 spin_lock(&inode->i_lock); 5858 acl = nfsi->nfs4_acl; 5859 if (acl == NULL) 5860 goto out; 5861 if (acl->type != type) 5862 goto out; 5863 if (buf == NULL) /* user is just asking for length */ 5864 goto out_len; 5865 if (acl->cached == 0) 5866 goto out; 5867 ret = -ERANGE; /* see getxattr(2) man page */ 5868 if (acl->len > buflen) 5869 goto out; 5870 memcpy(buf, acl->data, acl->len); 5871 out_len: 5872 ret = acl->len; 5873 out: 5874 spin_unlock(&inode->i_lock); 5875 return ret; 5876 } 5877 5878 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5879 size_t pgbase, size_t acl_len, 5880 enum nfs4_acl_type type) 5881 { 5882 struct nfs4_cached_acl *acl; 5883 size_t buflen = sizeof(*acl) + acl_len; 5884 5885 if (buflen <= PAGE_SIZE) { 5886 acl = kmalloc(buflen, GFP_KERNEL); 5887 if (acl == NULL) 5888 goto out; 5889 acl->cached = 1; 5890 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5891 } else { 5892 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5893 if (acl == NULL) 5894 goto out; 5895 acl->cached = 0; 5896 } 5897 acl->type = type; 5898 acl->len = acl_len; 5899 out: 5900 nfs4_set_cached_acl(inode, acl); 5901 } 5902 5903 /* 5904 * The getxattr API returns the required buffer length when called with a 5905 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5906 * the required buf. On a NULL buf, we send a page of data to the server 5907 * guessing that the ACL request can be serviced by a page. If so, we cache 5908 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5909 * the cache. If not so, we throw away the page, and cache the required 5910 * length. The next getxattr call will then produce another round trip to 5911 * the server, this time with the input buf of the required size. 5912 */ 5913 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5914 size_t buflen, enum nfs4_acl_type type) 5915 { 5916 struct page **pages; 5917 struct nfs_getaclargs args = { 5918 .fh = NFS_FH(inode), 5919 .acl_type = type, 5920 .acl_len = buflen, 5921 }; 5922 struct nfs_getaclres res = { 5923 .acl_type = type, 5924 .acl_len = buflen, 5925 }; 5926 struct rpc_message msg = { 5927 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5928 .rpc_argp = &args, 5929 .rpc_resp = &res, 5930 }; 5931 unsigned int npages; 5932 int ret = -ENOMEM, i; 5933 struct nfs_server *server = NFS_SERVER(inode); 5934 5935 if (buflen == 0) 5936 buflen = server->rsize; 5937 5938 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5939 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5940 if (!pages) 5941 return -ENOMEM; 5942 5943 args.acl_pages = pages; 5944 5945 for (i = 0; i < npages; i++) { 5946 pages[i] = alloc_page(GFP_KERNEL); 5947 if (!pages[i]) 5948 goto out_free; 5949 } 5950 5951 /* for decoding across pages */ 5952 res.acl_scratch = alloc_page(GFP_KERNEL); 5953 if (!res.acl_scratch) 5954 goto out_free; 5955 5956 args.acl_len = npages * PAGE_SIZE; 5957 5958 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5959 __func__, buf, buflen, npages, args.acl_len); 5960 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5961 &msg, &args.seq_args, &res.seq_res, 0); 5962 if (ret) 5963 goto out_free; 5964 5965 /* Handle the case where the passed-in buffer is too short */ 5966 if (res.acl_flags & NFS4_ACL_TRUNC) { 5967 /* Did the user only issue a request for the acl length? */ 5968 if (buf == NULL) 5969 goto out_ok; 5970 ret = -ERANGE; 5971 goto out_free; 5972 } 5973 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5974 type); 5975 if (buf) { 5976 if (res.acl_len > buflen) { 5977 ret = -ERANGE; 5978 goto out_free; 5979 } 5980 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5981 } 5982 out_ok: 5983 ret = res.acl_len; 5984 out_free: 5985 for (i = 0; i < npages; i++) 5986 if (pages[i]) 5987 __free_page(pages[i]); 5988 if (res.acl_scratch) 5989 __free_page(res.acl_scratch); 5990 kfree(pages); 5991 return ret; 5992 } 5993 5994 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 5995 size_t buflen, enum nfs4_acl_type type) 5996 { 5997 struct nfs4_exception exception = { 5998 .interruptible = true, 5999 }; 6000 ssize_t ret; 6001 do { 6002 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6003 trace_nfs4_get_acl(inode, ret); 6004 if (ret >= 0) 6005 break; 6006 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6007 } while (exception.retry); 6008 return ret; 6009 } 6010 6011 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6012 enum nfs4_acl_type type) 6013 { 6014 struct nfs_server *server = NFS_SERVER(inode); 6015 int ret; 6016 6017 if (!nfs4_server_supports_acls(server, type)) 6018 return -EOPNOTSUPP; 6019 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6020 if (ret < 0) 6021 return ret; 6022 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6023 nfs_zap_acl_cache(inode); 6024 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6025 if (ret != -ENOENT) 6026 /* -ENOENT is returned if there is no ACL or if there is an ACL 6027 * but no cached acl data, just the acl length */ 6028 return ret; 6029 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6030 } 6031 6032 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6033 size_t buflen, enum nfs4_acl_type type) 6034 { 6035 struct nfs_server *server = NFS_SERVER(inode); 6036 struct page *pages[NFS4ACL_MAXPAGES]; 6037 struct nfs_setaclargs arg = { 6038 .fh = NFS_FH(inode), 6039 .acl_type = type, 6040 .acl_len = buflen, 6041 .acl_pages = pages, 6042 }; 6043 struct nfs_setaclres res; 6044 struct rpc_message msg = { 6045 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6046 .rpc_argp = &arg, 6047 .rpc_resp = &res, 6048 }; 6049 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6050 int ret, i; 6051 6052 /* You can't remove system.nfs4_acl: */ 6053 if (buflen == 0) 6054 return -EINVAL; 6055 if (!nfs4_server_supports_acls(server, type)) 6056 return -EOPNOTSUPP; 6057 if (npages > ARRAY_SIZE(pages)) 6058 return -ERANGE; 6059 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6060 if (i < 0) 6061 return i; 6062 nfs4_inode_make_writeable(inode); 6063 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6064 6065 /* 6066 * Free each page after tx, so the only ref left is 6067 * held by the network stack 6068 */ 6069 for (; i > 0; i--) 6070 put_page(pages[i-1]); 6071 6072 /* 6073 * Acl update can result in inode attribute update. 6074 * so mark the attribute cache invalid. 6075 */ 6076 spin_lock(&inode->i_lock); 6077 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6078 NFS_INO_INVALID_CTIME | 6079 NFS_INO_REVAL_FORCED); 6080 spin_unlock(&inode->i_lock); 6081 nfs_access_zap_cache(inode); 6082 nfs_zap_acl_cache(inode); 6083 return ret; 6084 } 6085 6086 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6087 size_t buflen, enum nfs4_acl_type type) 6088 { 6089 struct nfs4_exception exception = { }; 6090 int err; 6091 do { 6092 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6093 trace_nfs4_set_acl(inode, err); 6094 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6095 /* 6096 * no need to retry since the kernel 6097 * isn't involved in encoding the ACEs. 6098 */ 6099 err = -EINVAL; 6100 break; 6101 } 6102 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6103 &exception); 6104 } while (exception.retry); 6105 return err; 6106 } 6107 6108 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6109 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6110 size_t buflen) 6111 { 6112 struct nfs_server *server = NFS_SERVER(inode); 6113 struct nfs4_label label = {0, 0, buflen, buf}; 6114 6115 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6116 struct nfs_fattr fattr = { 6117 .label = &label, 6118 }; 6119 struct nfs4_getattr_arg arg = { 6120 .fh = NFS_FH(inode), 6121 .bitmask = bitmask, 6122 }; 6123 struct nfs4_getattr_res res = { 6124 .fattr = &fattr, 6125 .server = server, 6126 }; 6127 struct rpc_message msg = { 6128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6129 .rpc_argp = &arg, 6130 .rpc_resp = &res, 6131 }; 6132 int ret; 6133 6134 nfs_fattr_init(&fattr); 6135 6136 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6137 if (ret) 6138 return ret; 6139 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6140 return -ENOENT; 6141 return label.len; 6142 } 6143 6144 static int nfs4_get_security_label(struct inode *inode, void *buf, 6145 size_t buflen) 6146 { 6147 struct nfs4_exception exception = { 6148 .interruptible = true, 6149 }; 6150 int err; 6151 6152 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6153 return -EOPNOTSUPP; 6154 6155 do { 6156 err = _nfs4_get_security_label(inode, buf, buflen); 6157 trace_nfs4_get_security_label(inode, err); 6158 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6159 &exception); 6160 } while (exception.retry); 6161 return err; 6162 } 6163 6164 static int _nfs4_do_set_security_label(struct inode *inode, 6165 struct nfs4_label *ilabel, 6166 struct nfs_fattr *fattr) 6167 { 6168 6169 struct iattr sattr = {0}; 6170 struct nfs_server *server = NFS_SERVER(inode); 6171 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6172 struct nfs_setattrargs arg = { 6173 .fh = NFS_FH(inode), 6174 .iap = &sattr, 6175 .server = server, 6176 .bitmask = bitmask, 6177 .label = ilabel, 6178 }; 6179 struct nfs_setattrres res = { 6180 .fattr = fattr, 6181 .server = server, 6182 }; 6183 struct rpc_message msg = { 6184 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6185 .rpc_argp = &arg, 6186 .rpc_resp = &res, 6187 }; 6188 int status; 6189 6190 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6191 6192 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6193 if (status) 6194 dprintk("%s failed: %d\n", __func__, status); 6195 6196 return status; 6197 } 6198 6199 static int nfs4_do_set_security_label(struct inode *inode, 6200 struct nfs4_label *ilabel, 6201 struct nfs_fattr *fattr) 6202 { 6203 struct nfs4_exception exception = { }; 6204 int err; 6205 6206 do { 6207 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6208 trace_nfs4_set_security_label(inode, err); 6209 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6210 &exception); 6211 } while (exception.retry); 6212 return err; 6213 } 6214 6215 static int 6216 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6217 { 6218 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6219 struct nfs_fattr *fattr; 6220 int status; 6221 6222 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6223 return -EOPNOTSUPP; 6224 6225 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6226 if (fattr == NULL) 6227 return -ENOMEM; 6228 6229 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6230 if (status == 0) 6231 nfs_setsecurity(inode, fattr); 6232 6233 return status; 6234 } 6235 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6236 6237 6238 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6239 nfs4_verifier *bootverf) 6240 { 6241 __be32 verf[2]; 6242 6243 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6244 /* An impossible timestamp guarantees this value 6245 * will never match a generated boot time. */ 6246 verf[0] = cpu_to_be32(U32_MAX); 6247 verf[1] = cpu_to_be32(U32_MAX); 6248 } else { 6249 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6250 u64 ns = ktime_to_ns(nn->boot_time); 6251 6252 verf[0] = cpu_to_be32(ns >> 32); 6253 verf[1] = cpu_to_be32(ns); 6254 } 6255 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6256 } 6257 6258 static size_t 6259 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6260 { 6261 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6262 struct nfs_netns_client *nn_clp = nn->nfs_client; 6263 const char *id; 6264 6265 buf[0] = '\0'; 6266 6267 if (nn_clp) { 6268 rcu_read_lock(); 6269 id = rcu_dereference(nn_clp->identifier); 6270 if (id) 6271 strscpy(buf, id, buflen); 6272 rcu_read_unlock(); 6273 } 6274 6275 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6276 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6277 6278 return strlen(buf); 6279 } 6280 6281 static int 6282 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6283 { 6284 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6285 size_t buflen; 6286 size_t len; 6287 char *str; 6288 6289 if (clp->cl_owner_id != NULL) 6290 return 0; 6291 6292 rcu_read_lock(); 6293 len = 14 + 6294 strlen(clp->cl_rpcclient->cl_nodename) + 6295 1 + 6296 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6297 1; 6298 rcu_read_unlock(); 6299 6300 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6301 if (buflen) 6302 len += buflen + 1; 6303 6304 if (len > NFS4_OPAQUE_LIMIT + 1) 6305 return -EINVAL; 6306 6307 /* 6308 * Since this string is allocated at mount time, and held until the 6309 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6310 * about a memory-reclaim deadlock. 6311 */ 6312 str = kmalloc(len, GFP_KERNEL); 6313 if (!str) 6314 return -ENOMEM; 6315 6316 rcu_read_lock(); 6317 if (buflen) 6318 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6319 clp->cl_rpcclient->cl_nodename, buf, 6320 rpc_peeraddr2str(clp->cl_rpcclient, 6321 RPC_DISPLAY_ADDR)); 6322 else 6323 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6324 clp->cl_rpcclient->cl_nodename, 6325 rpc_peeraddr2str(clp->cl_rpcclient, 6326 RPC_DISPLAY_ADDR)); 6327 rcu_read_unlock(); 6328 6329 clp->cl_owner_id = str; 6330 return 0; 6331 } 6332 6333 static int 6334 nfs4_init_uniform_client_string(struct nfs_client *clp) 6335 { 6336 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6337 size_t buflen; 6338 size_t len; 6339 char *str; 6340 6341 if (clp->cl_owner_id != NULL) 6342 return 0; 6343 6344 len = 10 + 10 + 1 + 10 + 1 + 6345 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6346 6347 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6348 if (buflen) 6349 len += buflen + 1; 6350 6351 if (len > NFS4_OPAQUE_LIMIT + 1) 6352 return -EINVAL; 6353 6354 /* 6355 * Since this string is allocated at mount time, and held until the 6356 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6357 * about a memory-reclaim deadlock. 6358 */ 6359 str = kmalloc(len, GFP_KERNEL); 6360 if (!str) 6361 return -ENOMEM; 6362 6363 if (buflen) 6364 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6365 clp->rpc_ops->version, clp->cl_minorversion, 6366 buf, clp->cl_rpcclient->cl_nodename); 6367 else 6368 scnprintf(str, len, "Linux NFSv%u.%u %s", 6369 clp->rpc_ops->version, clp->cl_minorversion, 6370 clp->cl_rpcclient->cl_nodename); 6371 clp->cl_owner_id = str; 6372 return 0; 6373 } 6374 6375 /* 6376 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6377 * services. Advertise one based on the address family of the 6378 * clientaddr. 6379 */ 6380 static unsigned int 6381 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6382 { 6383 if (strchr(clp->cl_ipaddr, ':') != NULL) 6384 return scnprintf(buf, len, "tcp6"); 6385 else 6386 return scnprintf(buf, len, "tcp"); 6387 } 6388 6389 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6390 { 6391 struct nfs4_setclientid *sc = calldata; 6392 6393 if (task->tk_status == 0) 6394 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6395 } 6396 6397 static const struct rpc_call_ops nfs4_setclientid_ops = { 6398 .rpc_call_done = nfs4_setclientid_done, 6399 }; 6400 6401 /** 6402 * nfs4_proc_setclientid - Negotiate client ID 6403 * @clp: state data structure 6404 * @program: RPC program for NFSv4 callback service 6405 * @port: IP port number for NFS4 callback service 6406 * @cred: credential to use for this call 6407 * @res: where to place the result 6408 * 6409 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6410 */ 6411 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6412 unsigned short port, const struct cred *cred, 6413 struct nfs4_setclientid_res *res) 6414 { 6415 nfs4_verifier sc_verifier; 6416 struct nfs4_setclientid setclientid = { 6417 .sc_verifier = &sc_verifier, 6418 .sc_prog = program, 6419 .sc_clnt = clp, 6420 }; 6421 struct rpc_message msg = { 6422 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6423 .rpc_argp = &setclientid, 6424 .rpc_resp = res, 6425 .rpc_cred = cred, 6426 }; 6427 struct rpc_task_setup task_setup_data = { 6428 .rpc_client = clp->cl_rpcclient, 6429 .rpc_message = &msg, 6430 .callback_ops = &nfs4_setclientid_ops, 6431 .callback_data = &setclientid, 6432 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6433 }; 6434 unsigned long now = jiffies; 6435 int status; 6436 6437 /* nfs_client_id4 */ 6438 nfs4_init_boot_verifier(clp, &sc_verifier); 6439 6440 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6441 status = nfs4_init_uniform_client_string(clp); 6442 else 6443 status = nfs4_init_nonuniform_client_string(clp); 6444 6445 if (status) 6446 goto out; 6447 6448 /* cb_client4 */ 6449 setclientid.sc_netid_len = 6450 nfs4_init_callback_netid(clp, 6451 setclientid.sc_netid, 6452 sizeof(setclientid.sc_netid)); 6453 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6454 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6455 clp->cl_ipaddr, port >> 8, port & 255); 6456 6457 dprintk("NFS call setclientid auth=%s, '%s'\n", 6458 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6459 clp->cl_owner_id); 6460 6461 status = nfs4_call_sync_custom(&task_setup_data); 6462 if (setclientid.sc_cred) { 6463 kfree(clp->cl_acceptor); 6464 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6465 put_rpccred(setclientid.sc_cred); 6466 } 6467 6468 if (status == 0) 6469 do_renew_lease(clp, now); 6470 out: 6471 trace_nfs4_setclientid(clp, status); 6472 dprintk("NFS reply setclientid: %d\n", status); 6473 return status; 6474 } 6475 6476 /** 6477 * nfs4_proc_setclientid_confirm - Confirm client ID 6478 * @clp: state data structure 6479 * @arg: result of a previous SETCLIENTID 6480 * @cred: credential to use for this call 6481 * 6482 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6483 */ 6484 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6485 struct nfs4_setclientid_res *arg, 6486 const struct cred *cred) 6487 { 6488 struct rpc_message msg = { 6489 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6490 .rpc_argp = arg, 6491 .rpc_cred = cred, 6492 }; 6493 int status; 6494 6495 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6496 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6497 clp->cl_clientid); 6498 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6499 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6500 trace_nfs4_setclientid_confirm(clp, status); 6501 dprintk("NFS reply setclientid_confirm: %d\n", status); 6502 return status; 6503 } 6504 6505 struct nfs4_delegreturndata { 6506 struct nfs4_delegreturnargs args; 6507 struct nfs4_delegreturnres res; 6508 struct nfs_fh fh; 6509 nfs4_stateid stateid; 6510 unsigned long timestamp; 6511 struct { 6512 struct nfs4_layoutreturn_args arg; 6513 struct nfs4_layoutreturn_res res; 6514 struct nfs4_xdr_opaque_data ld_private; 6515 u32 roc_barrier; 6516 bool roc; 6517 } lr; 6518 struct nfs_fattr fattr; 6519 int rpc_status; 6520 struct inode *inode; 6521 }; 6522 6523 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6524 { 6525 struct nfs4_delegreturndata *data = calldata; 6526 struct nfs4_exception exception = { 6527 .inode = data->inode, 6528 .stateid = &data->stateid, 6529 .task_is_privileged = data->args.seq_args.sa_privileged, 6530 }; 6531 6532 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6533 return; 6534 6535 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6536 6537 /* Handle Layoutreturn errors */ 6538 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6539 &data->res.lr_ret) == -EAGAIN) 6540 goto out_restart; 6541 6542 switch (task->tk_status) { 6543 case 0: 6544 renew_lease(data->res.server, data->timestamp); 6545 break; 6546 case -NFS4ERR_ADMIN_REVOKED: 6547 case -NFS4ERR_DELEG_REVOKED: 6548 case -NFS4ERR_EXPIRED: 6549 nfs4_free_revoked_stateid(data->res.server, 6550 data->args.stateid, 6551 task->tk_msg.rpc_cred); 6552 fallthrough; 6553 case -NFS4ERR_BAD_STATEID: 6554 case -NFS4ERR_STALE_STATEID: 6555 case -ETIMEDOUT: 6556 task->tk_status = 0; 6557 break; 6558 case -NFS4ERR_OLD_STATEID: 6559 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6560 nfs4_stateid_seqid_inc(&data->stateid); 6561 if (data->args.bitmask) { 6562 data->args.bitmask = NULL; 6563 data->res.fattr = NULL; 6564 } 6565 goto out_restart; 6566 case -NFS4ERR_ACCESS: 6567 if (data->args.bitmask) { 6568 data->args.bitmask = NULL; 6569 data->res.fattr = NULL; 6570 goto out_restart; 6571 } 6572 fallthrough; 6573 default: 6574 task->tk_status = nfs4_async_handle_exception(task, 6575 data->res.server, task->tk_status, 6576 &exception); 6577 if (exception.retry) 6578 goto out_restart; 6579 } 6580 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6581 data->rpc_status = task->tk_status; 6582 return; 6583 out_restart: 6584 task->tk_status = 0; 6585 rpc_restart_call_prepare(task); 6586 } 6587 6588 static void nfs4_delegreturn_release(void *calldata) 6589 { 6590 struct nfs4_delegreturndata *data = calldata; 6591 struct inode *inode = data->inode; 6592 6593 if (data->lr.roc) 6594 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6595 data->res.lr_ret); 6596 if (inode) { 6597 nfs4_fattr_set_prechange(&data->fattr, 6598 inode_peek_iversion_raw(inode)); 6599 nfs_refresh_inode(inode, &data->fattr); 6600 nfs_iput_and_deactive(inode); 6601 } 6602 kfree(calldata); 6603 } 6604 6605 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6606 { 6607 struct nfs4_delegreturndata *d_data; 6608 struct pnfs_layout_hdr *lo; 6609 6610 d_data = (struct nfs4_delegreturndata *)data; 6611 6612 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6613 nfs4_sequence_done(task, &d_data->res.seq_res); 6614 return; 6615 } 6616 6617 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6618 if (lo && !pnfs_layout_is_valid(lo)) { 6619 d_data->args.lr_args = NULL; 6620 d_data->res.lr_res = NULL; 6621 } 6622 6623 nfs4_setup_sequence(d_data->res.server->nfs_client, 6624 &d_data->args.seq_args, 6625 &d_data->res.seq_res, 6626 task); 6627 } 6628 6629 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6630 .rpc_call_prepare = nfs4_delegreturn_prepare, 6631 .rpc_call_done = nfs4_delegreturn_done, 6632 .rpc_release = nfs4_delegreturn_release, 6633 }; 6634 6635 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6636 { 6637 struct nfs4_delegreturndata *data; 6638 struct nfs_server *server = NFS_SERVER(inode); 6639 struct rpc_task *task; 6640 struct rpc_message msg = { 6641 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6642 .rpc_cred = cred, 6643 }; 6644 struct rpc_task_setup task_setup_data = { 6645 .rpc_client = server->client, 6646 .rpc_message = &msg, 6647 .callback_ops = &nfs4_delegreturn_ops, 6648 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6649 }; 6650 int status = 0; 6651 6652 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6653 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6654 6655 data = kzalloc(sizeof(*data), GFP_KERNEL); 6656 if (data == NULL) 6657 return -ENOMEM; 6658 6659 nfs4_state_protect(server->nfs_client, 6660 NFS_SP4_MACH_CRED_CLEANUP, 6661 &task_setup_data.rpc_client, &msg); 6662 6663 data->args.fhandle = &data->fh; 6664 data->args.stateid = &data->stateid; 6665 nfs4_bitmask_set(data->args.bitmask_store, 6666 server->cache_consistency_bitmask, inode, 0); 6667 data->args.bitmask = data->args.bitmask_store; 6668 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6669 nfs4_stateid_copy(&data->stateid, stateid); 6670 data->res.fattr = &data->fattr; 6671 data->res.server = server; 6672 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6673 data->lr.arg.ld_private = &data->lr.ld_private; 6674 nfs_fattr_init(data->res.fattr); 6675 data->timestamp = jiffies; 6676 data->rpc_status = 0; 6677 data->inode = nfs_igrab_and_active(inode); 6678 if (data->inode || issync) { 6679 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6680 cred); 6681 if (data->lr.roc) { 6682 data->args.lr_args = &data->lr.arg; 6683 data->res.lr_res = &data->lr.res; 6684 } 6685 } 6686 6687 if (!data->inode) 6688 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6689 1); 6690 else 6691 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6692 0); 6693 task_setup_data.callback_data = data; 6694 msg.rpc_argp = &data->args; 6695 msg.rpc_resp = &data->res; 6696 task = rpc_run_task(&task_setup_data); 6697 if (IS_ERR(task)) 6698 return PTR_ERR(task); 6699 if (!issync) 6700 goto out; 6701 status = rpc_wait_for_completion_task(task); 6702 if (status != 0) 6703 goto out; 6704 status = data->rpc_status; 6705 out: 6706 rpc_put_task(task); 6707 return status; 6708 } 6709 6710 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6711 { 6712 struct nfs_server *server = NFS_SERVER(inode); 6713 struct nfs4_exception exception = { }; 6714 int err; 6715 do { 6716 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6717 trace_nfs4_delegreturn(inode, stateid, err); 6718 switch (err) { 6719 case -NFS4ERR_STALE_STATEID: 6720 case -NFS4ERR_EXPIRED: 6721 case 0: 6722 return 0; 6723 } 6724 err = nfs4_handle_exception(server, err, &exception); 6725 } while (exception.retry); 6726 return err; 6727 } 6728 6729 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6730 { 6731 struct inode *inode = state->inode; 6732 struct nfs_server *server = NFS_SERVER(inode); 6733 struct nfs_client *clp = server->nfs_client; 6734 struct nfs_lockt_args arg = { 6735 .fh = NFS_FH(inode), 6736 .fl = request, 6737 }; 6738 struct nfs_lockt_res res = { 6739 .denied = request, 6740 }; 6741 struct rpc_message msg = { 6742 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6743 .rpc_argp = &arg, 6744 .rpc_resp = &res, 6745 .rpc_cred = state->owner->so_cred, 6746 }; 6747 struct nfs4_lock_state *lsp; 6748 int status; 6749 6750 arg.lock_owner.clientid = clp->cl_clientid; 6751 status = nfs4_set_lock_state(state, request); 6752 if (status != 0) 6753 goto out; 6754 lsp = request->fl_u.nfs4_fl.owner; 6755 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6756 arg.lock_owner.s_dev = server->s_dev; 6757 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6758 switch (status) { 6759 case 0: 6760 request->fl_type = F_UNLCK; 6761 break; 6762 case -NFS4ERR_DENIED: 6763 status = 0; 6764 } 6765 request->fl_ops->fl_release_private(request); 6766 request->fl_ops = NULL; 6767 out: 6768 return status; 6769 } 6770 6771 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6772 { 6773 struct nfs4_exception exception = { 6774 .interruptible = true, 6775 }; 6776 int err; 6777 6778 do { 6779 err = _nfs4_proc_getlk(state, cmd, request); 6780 trace_nfs4_get_lock(request, state, cmd, err); 6781 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6782 &exception); 6783 } while (exception.retry); 6784 return err; 6785 } 6786 6787 /* 6788 * Update the seqid of a lock stateid after receiving 6789 * NFS4ERR_OLD_STATEID 6790 */ 6791 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6792 struct nfs4_lock_state *lsp) 6793 { 6794 struct nfs4_state *state = lsp->ls_state; 6795 bool ret = false; 6796 6797 spin_lock(&state->state_lock); 6798 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6799 goto out; 6800 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6801 nfs4_stateid_seqid_inc(dst); 6802 else 6803 dst->seqid = lsp->ls_stateid.seqid; 6804 ret = true; 6805 out: 6806 spin_unlock(&state->state_lock); 6807 return ret; 6808 } 6809 6810 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6811 struct nfs4_lock_state *lsp) 6812 { 6813 struct nfs4_state *state = lsp->ls_state; 6814 bool ret; 6815 6816 spin_lock(&state->state_lock); 6817 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6818 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6819 spin_unlock(&state->state_lock); 6820 return ret; 6821 } 6822 6823 struct nfs4_unlockdata { 6824 struct nfs_locku_args arg; 6825 struct nfs_locku_res res; 6826 struct nfs4_lock_state *lsp; 6827 struct nfs_open_context *ctx; 6828 struct nfs_lock_context *l_ctx; 6829 struct file_lock fl; 6830 struct nfs_server *server; 6831 unsigned long timestamp; 6832 }; 6833 6834 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6835 struct nfs_open_context *ctx, 6836 struct nfs4_lock_state *lsp, 6837 struct nfs_seqid *seqid) 6838 { 6839 struct nfs4_unlockdata *p; 6840 struct nfs4_state *state = lsp->ls_state; 6841 struct inode *inode = state->inode; 6842 6843 p = kzalloc(sizeof(*p), GFP_KERNEL); 6844 if (p == NULL) 6845 return NULL; 6846 p->arg.fh = NFS_FH(inode); 6847 p->arg.fl = &p->fl; 6848 p->arg.seqid = seqid; 6849 p->res.seqid = seqid; 6850 p->lsp = lsp; 6851 /* Ensure we don't close file until we're done freeing locks! */ 6852 p->ctx = get_nfs_open_context(ctx); 6853 p->l_ctx = nfs_get_lock_context(ctx); 6854 locks_init_lock(&p->fl); 6855 locks_copy_lock(&p->fl, fl); 6856 p->server = NFS_SERVER(inode); 6857 spin_lock(&state->state_lock); 6858 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6859 spin_unlock(&state->state_lock); 6860 return p; 6861 } 6862 6863 static void nfs4_locku_release_calldata(void *data) 6864 { 6865 struct nfs4_unlockdata *calldata = data; 6866 nfs_free_seqid(calldata->arg.seqid); 6867 nfs4_put_lock_state(calldata->lsp); 6868 nfs_put_lock_context(calldata->l_ctx); 6869 put_nfs_open_context(calldata->ctx); 6870 kfree(calldata); 6871 } 6872 6873 static void nfs4_locku_done(struct rpc_task *task, void *data) 6874 { 6875 struct nfs4_unlockdata *calldata = data; 6876 struct nfs4_exception exception = { 6877 .inode = calldata->lsp->ls_state->inode, 6878 .stateid = &calldata->arg.stateid, 6879 }; 6880 6881 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6882 return; 6883 switch (task->tk_status) { 6884 case 0: 6885 renew_lease(calldata->server, calldata->timestamp); 6886 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6887 if (nfs4_update_lock_stateid(calldata->lsp, 6888 &calldata->res.stateid)) 6889 break; 6890 fallthrough; 6891 case -NFS4ERR_ADMIN_REVOKED: 6892 case -NFS4ERR_EXPIRED: 6893 nfs4_free_revoked_stateid(calldata->server, 6894 &calldata->arg.stateid, 6895 task->tk_msg.rpc_cred); 6896 fallthrough; 6897 case -NFS4ERR_BAD_STATEID: 6898 case -NFS4ERR_STALE_STATEID: 6899 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6900 calldata->lsp)) 6901 rpc_restart_call_prepare(task); 6902 break; 6903 case -NFS4ERR_OLD_STATEID: 6904 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6905 calldata->lsp)) 6906 rpc_restart_call_prepare(task); 6907 break; 6908 default: 6909 task->tk_status = nfs4_async_handle_exception(task, 6910 calldata->server, task->tk_status, 6911 &exception); 6912 if (exception.retry) 6913 rpc_restart_call_prepare(task); 6914 } 6915 nfs_release_seqid(calldata->arg.seqid); 6916 } 6917 6918 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6919 { 6920 struct nfs4_unlockdata *calldata = data; 6921 6922 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6923 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6924 return; 6925 6926 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6927 goto out_wait; 6928 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6929 /* Note: exit _without_ running nfs4_locku_done */ 6930 goto out_no_action; 6931 } 6932 calldata->timestamp = jiffies; 6933 if (nfs4_setup_sequence(calldata->server->nfs_client, 6934 &calldata->arg.seq_args, 6935 &calldata->res.seq_res, 6936 task) != 0) 6937 nfs_release_seqid(calldata->arg.seqid); 6938 return; 6939 out_no_action: 6940 task->tk_action = NULL; 6941 out_wait: 6942 nfs4_sequence_done(task, &calldata->res.seq_res); 6943 } 6944 6945 static const struct rpc_call_ops nfs4_locku_ops = { 6946 .rpc_call_prepare = nfs4_locku_prepare, 6947 .rpc_call_done = nfs4_locku_done, 6948 .rpc_release = nfs4_locku_release_calldata, 6949 }; 6950 6951 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6952 struct nfs_open_context *ctx, 6953 struct nfs4_lock_state *lsp, 6954 struct nfs_seqid *seqid) 6955 { 6956 struct nfs4_unlockdata *data; 6957 struct rpc_message msg = { 6958 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6959 .rpc_cred = ctx->cred, 6960 }; 6961 struct rpc_task_setup task_setup_data = { 6962 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6963 .rpc_message = &msg, 6964 .callback_ops = &nfs4_locku_ops, 6965 .workqueue = nfsiod_workqueue, 6966 .flags = RPC_TASK_ASYNC, 6967 }; 6968 6969 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6970 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6971 6972 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6973 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6974 6975 /* Ensure this is an unlock - when canceling a lock, the 6976 * canceled lock is passed in, and it won't be an unlock. 6977 */ 6978 fl->fl_type = F_UNLCK; 6979 if (fl->fl_flags & FL_CLOSE) 6980 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6981 6982 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6983 if (data == NULL) { 6984 nfs_free_seqid(seqid); 6985 return ERR_PTR(-ENOMEM); 6986 } 6987 6988 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6989 msg.rpc_argp = &data->arg; 6990 msg.rpc_resp = &data->res; 6991 task_setup_data.callback_data = data; 6992 return rpc_run_task(&task_setup_data); 6993 } 6994 6995 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6996 { 6997 struct inode *inode = state->inode; 6998 struct nfs4_state_owner *sp = state->owner; 6999 struct nfs_inode *nfsi = NFS_I(inode); 7000 struct nfs_seqid *seqid; 7001 struct nfs4_lock_state *lsp; 7002 struct rpc_task *task; 7003 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7004 int status = 0; 7005 unsigned char fl_flags = request->fl_flags; 7006 7007 status = nfs4_set_lock_state(state, request); 7008 /* Unlock _before_ we do the RPC call */ 7009 request->fl_flags |= FL_EXISTS; 7010 /* Exclude nfs_delegation_claim_locks() */ 7011 mutex_lock(&sp->so_delegreturn_mutex); 7012 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7013 down_read(&nfsi->rwsem); 7014 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7015 up_read(&nfsi->rwsem); 7016 mutex_unlock(&sp->so_delegreturn_mutex); 7017 goto out; 7018 } 7019 up_read(&nfsi->rwsem); 7020 mutex_unlock(&sp->so_delegreturn_mutex); 7021 if (status != 0) 7022 goto out; 7023 /* Is this a delegated lock? */ 7024 lsp = request->fl_u.nfs4_fl.owner; 7025 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7026 goto out; 7027 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7028 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7029 status = -ENOMEM; 7030 if (IS_ERR(seqid)) 7031 goto out; 7032 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7033 status = PTR_ERR(task); 7034 if (IS_ERR(task)) 7035 goto out; 7036 status = rpc_wait_for_completion_task(task); 7037 rpc_put_task(task); 7038 out: 7039 request->fl_flags = fl_flags; 7040 trace_nfs4_unlock(request, state, F_SETLK, status); 7041 return status; 7042 } 7043 7044 struct nfs4_lockdata { 7045 struct nfs_lock_args arg; 7046 struct nfs_lock_res res; 7047 struct nfs4_lock_state *lsp; 7048 struct nfs_open_context *ctx; 7049 struct file_lock fl; 7050 unsigned long timestamp; 7051 int rpc_status; 7052 int cancelled; 7053 struct nfs_server *server; 7054 }; 7055 7056 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7057 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7058 gfp_t gfp_mask) 7059 { 7060 struct nfs4_lockdata *p; 7061 struct inode *inode = lsp->ls_state->inode; 7062 struct nfs_server *server = NFS_SERVER(inode); 7063 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7064 7065 p = kzalloc(sizeof(*p), gfp_mask); 7066 if (p == NULL) 7067 return NULL; 7068 7069 p->arg.fh = NFS_FH(inode); 7070 p->arg.fl = &p->fl; 7071 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7072 if (IS_ERR(p->arg.open_seqid)) 7073 goto out_free; 7074 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7075 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7076 if (IS_ERR(p->arg.lock_seqid)) 7077 goto out_free_seqid; 7078 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7079 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7080 p->arg.lock_owner.s_dev = server->s_dev; 7081 p->res.lock_seqid = p->arg.lock_seqid; 7082 p->lsp = lsp; 7083 p->server = server; 7084 p->ctx = get_nfs_open_context(ctx); 7085 locks_init_lock(&p->fl); 7086 locks_copy_lock(&p->fl, fl); 7087 return p; 7088 out_free_seqid: 7089 nfs_free_seqid(p->arg.open_seqid); 7090 out_free: 7091 kfree(p); 7092 return NULL; 7093 } 7094 7095 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7096 { 7097 struct nfs4_lockdata *data = calldata; 7098 struct nfs4_state *state = data->lsp->ls_state; 7099 7100 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7101 goto out_wait; 7102 /* Do we need to do an open_to_lock_owner? */ 7103 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7104 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7105 goto out_release_lock_seqid; 7106 } 7107 nfs4_stateid_copy(&data->arg.open_stateid, 7108 &state->open_stateid); 7109 data->arg.new_lock_owner = 1; 7110 data->res.open_seqid = data->arg.open_seqid; 7111 } else { 7112 data->arg.new_lock_owner = 0; 7113 nfs4_stateid_copy(&data->arg.lock_stateid, 7114 &data->lsp->ls_stateid); 7115 } 7116 if (!nfs4_valid_open_stateid(state)) { 7117 data->rpc_status = -EBADF; 7118 task->tk_action = NULL; 7119 goto out_release_open_seqid; 7120 } 7121 data->timestamp = jiffies; 7122 if (nfs4_setup_sequence(data->server->nfs_client, 7123 &data->arg.seq_args, 7124 &data->res.seq_res, 7125 task) == 0) 7126 return; 7127 out_release_open_seqid: 7128 nfs_release_seqid(data->arg.open_seqid); 7129 out_release_lock_seqid: 7130 nfs_release_seqid(data->arg.lock_seqid); 7131 out_wait: 7132 nfs4_sequence_done(task, &data->res.seq_res); 7133 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7134 } 7135 7136 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7137 { 7138 struct nfs4_lockdata *data = calldata; 7139 struct nfs4_lock_state *lsp = data->lsp; 7140 7141 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7142 return; 7143 7144 data->rpc_status = task->tk_status; 7145 switch (task->tk_status) { 7146 case 0: 7147 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7148 data->timestamp); 7149 if (data->arg.new_lock && !data->cancelled) { 7150 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7151 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7152 goto out_restart; 7153 } 7154 if (data->arg.new_lock_owner != 0) { 7155 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7156 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7157 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7158 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7159 goto out_restart; 7160 break; 7161 case -NFS4ERR_BAD_STATEID: 7162 case -NFS4ERR_OLD_STATEID: 7163 case -NFS4ERR_STALE_STATEID: 7164 case -NFS4ERR_EXPIRED: 7165 if (data->arg.new_lock_owner != 0) { 7166 if (!nfs4_stateid_match(&data->arg.open_stateid, 7167 &lsp->ls_state->open_stateid)) 7168 goto out_restart; 7169 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7170 &lsp->ls_stateid)) 7171 goto out_restart; 7172 } 7173 out_done: 7174 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7175 return; 7176 out_restart: 7177 if (!data->cancelled) 7178 rpc_restart_call_prepare(task); 7179 goto out_done; 7180 } 7181 7182 static void nfs4_lock_release(void *calldata) 7183 { 7184 struct nfs4_lockdata *data = calldata; 7185 7186 nfs_free_seqid(data->arg.open_seqid); 7187 if (data->cancelled && data->rpc_status == 0) { 7188 struct rpc_task *task; 7189 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7190 data->arg.lock_seqid); 7191 if (!IS_ERR(task)) 7192 rpc_put_task_async(task); 7193 dprintk("%s: cancelling lock!\n", __func__); 7194 } else 7195 nfs_free_seqid(data->arg.lock_seqid); 7196 nfs4_put_lock_state(data->lsp); 7197 put_nfs_open_context(data->ctx); 7198 kfree(data); 7199 } 7200 7201 static const struct rpc_call_ops nfs4_lock_ops = { 7202 .rpc_call_prepare = nfs4_lock_prepare, 7203 .rpc_call_done = nfs4_lock_done, 7204 .rpc_release = nfs4_lock_release, 7205 }; 7206 7207 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7208 { 7209 switch (error) { 7210 case -NFS4ERR_ADMIN_REVOKED: 7211 case -NFS4ERR_EXPIRED: 7212 case -NFS4ERR_BAD_STATEID: 7213 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7214 if (new_lock_owner != 0 || 7215 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7216 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7217 break; 7218 case -NFS4ERR_STALE_STATEID: 7219 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7220 nfs4_schedule_lease_recovery(server->nfs_client); 7221 } 7222 } 7223 7224 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7225 { 7226 struct nfs4_lockdata *data; 7227 struct rpc_task *task; 7228 struct rpc_message msg = { 7229 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7230 .rpc_cred = state->owner->so_cred, 7231 }; 7232 struct rpc_task_setup task_setup_data = { 7233 .rpc_client = NFS_CLIENT(state->inode), 7234 .rpc_message = &msg, 7235 .callback_ops = &nfs4_lock_ops, 7236 .workqueue = nfsiod_workqueue, 7237 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7238 }; 7239 int ret; 7240 7241 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7242 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7243 7244 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7245 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7246 if (data == NULL) 7247 return -ENOMEM; 7248 if (IS_SETLKW(cmd)) 7249 data->arg.block = 1; 7250 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7251 recovery_type > NFS_LOCK_NEW); 7252 msg.rpc_argp = &data->arg; 7253 msg.rpc_resp = &data->res; 7254 task_setup_data.callback_data = data; 7255 if (recovery_type > NFS_LOCK_NEW) { 7256 if (recovery_type == NFS_LOCK_RECLAIM) 7257 data->arg.reclaim = NFS_LOCK_RECLAIM; 7258 } else 7259 data->arg.new_lock = 1; 7260 task = rpc_run_task(&task_setup_data); 7261 if (IS_ERR(task)) 7262 return PTR_ERR(task); 7263 ret = rpc_wait_for_completion_task(task); 7264 if (ret == 0) { 7265 ret = data->rpc_status; 7266 if (ret) 7267 nfs4_handle_setlk_error(data->server, data->lsp, 7268 data->arg.new_lock_owner, ret); 7269 } else 7270 data->cancelled = true; 7271 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7272 rpc_put_task(task); 7273 dprintk("%s: ret = %d\n", __func__, ret); 7274 return ret; 7275 } 7276 7277 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7278 { 7279 struct nfs_server *server = NFS_SERVER(state->inode); 7280 struct nfs4_exception exception = { 7281 .inode = state->inode, 7282 }; 7283 int err; 7284 7285 do { 7286 /* Cache the lock if possible... */ 7287 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7288 return 0; 7289 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7290 if (err != -NFS4ERR_DELAY) 7291 break; 7292 nfs4_handle_exception(server, err, &exception); 7293 } while (exception.retry); 7294 return err; 7295 } 7296 7297 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7298 { 7299 struct nfs_server *server = NFS_SERVER(state->inode); 7300 struct nfs4_exception exception = { 7301 .inode = state->inode, 7302 }; 7303 int err; 7304 7305 err = nfs4_set_lock_state(state, request); 7306 if (err != 0) 7307 return err; 7308 if (!recover_lost_locks) { 7309 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7310 return 0; 7311 } 7312 do { 7313 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7314 return 0; 7315 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7316 switch (err) { 7317 default: 7318 goto out; 7319 case -NFS4ERR_GRACE: 7320 case -NFS4ERR_DELAY: 7321 nfs4_handle_exception(server, err, &exception); 7322 err = 0; 7323 } 7324 } while (exception.retry); 7325 out: 7326 return err; 7327 } 7328 7329 #if defined(CONFIG_NFS_V4_1) 7330 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7331 { 7332 struct nfs4_lock_state *lsp; 7333 int status; 7334 7335 status = nfs4_set_lock_state(state, request); 7336 if (status != 0) 7337 return status; 7338 lsp = request->fl_u.nfs4_fl.owner; 7339 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7340 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7341 return 0; 7342 return nfs4_lock_expired(state, request); 7343 } 7344 #endif 7345 7346 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7347 { 7348 struct nfs_inode *nfsi = NFS_I(state->inode); 7349 struct nfs4_state_owner *sp = state->owner; 7350 unsigned char fl_flags = request->fl_flags; 7351 int status; 7352 7353 request->fl_flags |= FL_ACCESS; 7354 status = locks_lock_inode_wait(state->inode, request); 7355 if (status < 0) 7356 goto out; 7357 mutex_lock(&sp->so_delegreturn_mutex); 7358 down_read(&nfsi->rwsem); 7359 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7360 /* Yes: cache locks! */ 7361 /* ...but avoid races with delegation recall... */ 7362 request->fl_flags = fl_flags & ~FL_SLEEP; 7363 status = locks_lock_inode_wait(state->inode, request); 7364 up_read(&nfsi->rwsem); 7365 mutex_unlock(&sp->so_delegreturn_mutex); 7366 goto out; 7367 } 7368 up_read(&nfsi->rwsem); 7369 mutex_unlock(&sp->so_delegreturn_mutex); 7370 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7371 out: 7372 request->fl_flags = fl_flags; 7373 return status; 7374 } 7375 7376 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7377 { 7378 struct nfs4_exception exception = { 7379 .state = state, 7380 .inode = state->inode, 7381 .interruptible = true, 7382 }; 7383 int err; 7384 7385 do { 7386 err = _nfs4_proc_setlk(state, cmd, request); 7387 if (err == -NFS4ERR_DENIED) 7388 err = -EAGAIN; 7389 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7390 err, &exception); 7391 } while (exception.retry); 7392 return err; 7393 } 7394 7395 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7396 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7397 7398 static int 7399 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7400 struct file_lock *request) 7401 { 7402 int status = -ERESTARTSYS; 7403 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7404 7405 while(!signalled()) { 7406 status = nfs4_proc_setlk(state, cmd, request); 7407 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7408 break; 7409 freezable_schedule_timeout_interruptible(timeout); 7410 timeout *= 2; 7411 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7412 status = -ERESTARTSYS; 7413 } 7414 return status; 7415 } 7416 7417 #ifdef CONFIG_NFS_V4_1 7418 struct nfs4_lock_waiter { 7419 struct inode *inode; 7420 struct nfs_lowner owner; 7421 wait_queue_entry_t wait; 7422 }; 7423 7424 static int 7425 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7426 { 7427 struct nfs4_lock_waiter *waiter = 7428 container_of(wait, struct nfs4_lock_waiter, wait); 7429 7430 /* NULL key means to wake up everyone */ 7431 if (key) { 7432 struct cb_notify_lock_args *cbnl = key; 7433 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7434 *wowner = &waiter->owner; 7435 7436 /* Only wake if the callback was for the same owner. */ 7437 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7438 return 0; 7439 7440 /* Make sure it's for the right inode */ 7441 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7442 return 0; 7443 } 7444 7445 return woken_wake_function(wait, mode, flags, key); 7446 } 7447 7448 static int 7449 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7450 { 7451 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7452 struct nfs_server *server = NFS_SERVER(state->inode); 7453 struct nfs_client *clp = server->nfs_client; 7454 wait_queue_head_t *q = &clp->cl_lock_waitq; 7455 struct nfs4_lock_waiter waiter = { 7456 .inode = state->inode, 7457 .owner = { .clientid = clp->cl_clientid, 7458 .id = lsp->ls_seqid.owner_id, 7459 .s_dev = server->s_dev }, 7460 }; 7461 int status; 7462 7463 /* Don't bother with waitqueue if we don't expect a callback */ 7464 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7465 return nfs4_retry_setlk_simple(state, cmd, request); 7466 7467 init_wait(&waiter.wait); 7468 waiter.wait.func = nfs4_wake_lock_waiter; 7469 add_wait_queue(q, &waiter.wait); 7470 7471 do { 7472 status = nfs4_proc_setlk(state, cmd, request); 7473 if (status != -EAGAIN || IS_SETLK(cmd)) 7474 break; 7475 7476 status = -ERESTARTSYS; 7477 freezer_do_not_count(); 7478 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE, 7479 NFS4_LOCK_MAXTIMEOUT); 7480 freezer_count(); 7481 } while (!signalled()); 7482 7483 remove_wait_queue(q, &waiter.wait); 7484 7485 return status; 7486 } 7487 #else /* !CONFIG_NFS_V4_1 */ 7488 static inline int 7489 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7490 { 7491 return nfs4_retry_setlk_simple(state, cmd, request); 7492 } 7493 #endif 7494 7495 static int 7496 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7497 { 7498 struct nfs_open_context *ctx; 7499 struct nfs4_state *state; 7500 int status; 7501 7502 /* verify open state */ 7503 ctx = nfs_file_open_context(filp); 7504 state = ctx->state; 7505 7506 if (IS_GETLK(cmd)) { 7507 if (state != NULL) 7508 return nfs4_proc_getlk(state, F_GETLK, request); 7509 return 0; 7510 } 7511 7512 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7513 return -EINVAL; 7514 7515 if (request->fl_type == F_UNLCK) { 7516 if (state != NULL) 7517 return nfs4_proc_unlck(state, cmd, request); 7518 return 0; 7519 } 7520 7521 if (state == NULL) 7522 return -ENOLCK; 7523 7524 if ((request->fl_flags & FL_POSIX) && 7525 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7526 return -ENOLCK; 7527 7528 /* 7529 * Don't rely on the VFS having checked the file open mode, 7530 * since it won't do this for flock() locks. 7531 */ 7532 switch (request->fl_type) { 7533 case F_RDLCK: 7534 if (!(filp->f_mode & FMODE_READ)) 7535 return -EBADF; 7536 break; 7537 case F_WRLCK: 7538 if (!(filp->f_mode & FMODE_WRITE)) 7539 return -EBADF; 7540 } 7541 7542 status = nfs4_set_lock_state(state, request); 7543 if (status != 0) 7544 return status; 7545 7546 return nfs4_retry_setlk(state, cmd, request); 7547 } 7548 7549 static int nfs4_delete_lease(struct file *file, void **priv) 7550 { 7551 return generic_setlease(file, F_UNLCK, NULL, priv); 7552 } 7553 7554 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease, 7555 void **priv) 7556 { 7557 struct inode *inode = file_inode(file); 7558 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7559 int ret; 7560 7561 /* No delegation, no lease */ 7562 if (!nfs4_have_delegation(inode, type)) 7563 return -EAGAIN; 7564 ret = generic_setlease(file, arg, lease, priv); 7565 if (ret || nfs4_have_delegation(inode, type)) 7566 return ret; 7567 /* We raced with a delegation return */ 7568 nfs4_delete_lease(file, priv); 7569 return -EAGAIN; 7570 } 7571 7572 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease, 7573 void **priv) 7574 { 7575 switch (arg) { 7576 case F_RDLCK: 7577 case F_WRLCK: 7578 return nfs4_add_lease(file, arg, lease, priv); 7579 case F_UNLCK: 7580 return nfs4_delete_lease(file, priv); 7581 default: 7582 return -EINVAL; 7583 } 7584 } 7585 7586 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7587 { 7588 struct nfs_server *server = NFS_SERVER(state->inode); 7589 int err; 7590 7591 err = nfs4_set_lock_state(state, fl); 7592 if (err != 0) 7593 return err; 7594 do { 7595 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7596 if (err != -NFS4ERR_DELAY) 7597 break; 7598 ssleep(1); 7599 } while (err == -NFS4ERR_DELAY); 7600 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7601 } 7602 7603 struct nfs_release_lockowner_data { 7604 struct nfs4_lock_state *lsp; 7605 struct nfs_server *server; 7606 struct nfs_release_lockowner_args args; 7607 struct nfs_release_lockowner_res res; 7608 unsigned long timestamp; 7609 }; 7610 7611 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7612 { 7613 struct nfs_release_lockowner_data *data = calldata; 7614 struct nfs_server *server = data->server; 7615 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7616 &data->res.seq_res, task); 7617 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7618 data->timestamp = jiffies; 7619 } 7620 7621 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7622 { 7623 struct nfs_release_lockowner_data *data = calldata; 7624 struct nfs_server *server = data->server; 7625 7626 nfs40_sequence_done(task, &data->res.seq_res); 7627 7628 switch (task->tk_status) { 7629 case 0: 7630 renew_lease(server, data->timestamp); 7631 break; 7632 case -NFS4ERR_STALE_CLIENTID: 7633 case -NFS4ERR_EXPIRED: 7634 nfs4_schedule_lease_recovery(server->nfs_client); 7635 break; 7636 case -NFS4ERR_LEASE_MOVED: 7637 case -NFS4ERR_DELAY: 7638 if (nfs4_async_handle_error(task, server, 7639 NULL, NULL) == -EAGAIN) 7640 rpc_restart_call_prepare(task); 7641 } 7642 } 7643 7644 static void nfs4_release_lockowner_release(void *calldata) 7645 { 7646 struct nfs_release_lockowner_data *data = calldata; 7647 nfs4_free_lock_state(data->server, data->lsp); 7648 kfree(calldata); 7649 } 7650 7651 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7652 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7653 .rpc_call_done = nfs4_release_lockowner_done, 7654 .rpc_release = nfs4_release_lockowner_release, 7655 }; 7656 7657 static void 7658 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7659 { 7660 struct nfs_release_lockowner_data *data; 7661 struct rpc_message msg = { 7662 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7663 }; 7664 7665 if (server->nfs_client->cl_mvops->minor_version != 0) 7666 return; 7667 7668 data = kmalloc(sizeof(*data), GFP_KERNEL); 7669 if (!data) 7670 return; 7671 data->lsp = lsp; 7672 data->server = server; 7673 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7674 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7675 data->args.lock_owner.s_dev = server->s_dev; 7676 7677 msg.rpc_argp = &data->args; 7678 msg.rpc_resp = &data->res; 7679 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7680 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7681 } 7682 7683 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7684 7685 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7686 struct user_namespace *mnt_userns, 7687 struct dentry *unused, struct inode *inode, 7688 const char *key, const void *buf, 7689 size_t buflen, int flags) 7690 { 7691 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7692 } 7693 7694 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7695 struct dentry *unused, struct inode *inode, 7696 const char *key, void *buf, size_t buflen) 7697 { 7698 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7699 } 7700 7701 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7702 { 7703 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7704 } 7705 7706 #if defined(CONFIG_NFS_V4_1) 7707 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7708 7709 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7710 struct user_namespace *mnt_userns, 7711 struct dentry *unused, struct inode *inode, 7712 const char *key, const void *buf, 7713 size_t buflen, int flags) 7714 { 7715 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7716 } 7717 7718 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7719 struct dentry *unused, struct inode *inode, 7720 const char *key, void *buf, size_t buflen) 7721 { 7722 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7723 } 7724 7725 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7726 { 7727 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7728 } 7729 7730 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7731 7732 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7733 struct user_namespace *mnt_userns, 7734 struct dentry *unused, struct inode *inode, 7735 const char *key, const void *buf, 7736 size_t buflen, int flags) 7737 { 7738 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7739 } 7740 7741 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7742 struct dentry *unused, struct inode *inode, 7743 const char *key, void *buf, size_t buflen) 7744 { 7745 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7746 } 7747 7748 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7749 { 7750 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7751 } 7752 7753 #endif 7754 7755 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7756 7757 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7758 struct user_namespace *mnt_userns, 7759 struct dentry *unused, struct inode *inode, 7760 const char *key, const void *buf, 7761 size_t buflen, int flags) 7762 { 7763 if (security_ismaclabel(key)) 7764 return nfs4_set_security_label(inode, buf, buflen); 7765 7766 return -EOPNOTSUPP; 7767 } 7768 7769 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7770 struct dentry *unused, struct inode *inode, 7771 const char *key, void *buf, size_t buflen) 7772 { 7773 if (security_ismaclabel(key)) 7774 return nfs4_get_security_label(inode, buf, buflen); 7775 return -EOPNOTSUPP; 7776 } 7777 7778 static ssize_t 7779 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7780 { 7781 int len = 0; 7782 7783 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7784 len = security_inode_listsecurity(inode, list, list_len); 7785 if (len >= 0 && list_len && len > list_len) 7786 return -ERANGE; 7787 } 7788 return len; 7789 } 7790 7791 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7792 .prefix = XATTR_SECURITY_PREFIX, 7793 .get = nfs4_xattr_get_nfs4_label, 7794 .set = nfs4_xattr_set_nfs4_label, 7795 }; 7796 7797 #else 7798 7799 static ssize_t 7800 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7801 { 7802 return 0; 7803 } 7804 7805 #endif 7806 7807 #ifdef CONFIG_NFS_V4_2 7808 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7809 struct user_namespace *mnt_userns, 7810 struct dentry *unused, struct inode *inode, 7811 const char *key, const void *buf, 7812 size_t buflen, int flags) 7813 { 7814 u32 mask; 7815 int ret; 7816 7817 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7818 return -EOPNOTSUPP; 7819 7820 /* 7821 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7822 * flags right now. Handling of xattr operations use the normal 7823 * file read/write permissions. 7824 * 7825 * Just in case the server has other ideas (which RFC 8276 allows), 7826 * do a cached access check for the XA* flags to possibly avoid 7827 * doing an RPC and getting EACCES back. 7828 */ 7829 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7830 if (!(mask & NFS_ACCESS_XAWRITE)) 7831 return -EACCES; 7832 } 7833 7834 if (buf == NULL) { 7835 ret = nfs42_proc_removexattr(inode, key); 7836 if (!ret) 7837 nfs4_xattr_cache_remove(inode, key); 7838 } else { 7839 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7840 if (!ret) 7841 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7842 } 7843 7844 return ret; 7845 } 7846 7847 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7848 struct dentry *unused, struct inode *inode, 7849 const char *key, void *buf, size_t buflen) 7850 { 7851 u32 mask; 7852 ssize_t ret; 7853 7854 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7855 return -EOPNOTSUPP; 7856 7857 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7858 if (!(mask & NFS_ACCESS_XAREAD)) 7859 return -EACCES; 7860 } 7861 7862 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7863 if (ret) 7864 return ret; 7865 7866 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7867 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7868 return ret; 7869 7870 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7871 7872 return ret; 7873 } 7874 7875 static ssize_t 7876 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7877 { 7878 u64 cookie; 7879 bool eof; 7880 ssize_t ret, size; 7881 char *buf; 7882 size_t buflen; 7883 u32 mask; 7884 7885 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7886 return 0; 7887 7888 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7889 if (!(mask & NFS_ACCESS_XALIST)) 7890 return 0; 7891 } 7892 7893 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7894 if (ret) 7895 return ret; 7896 7897 ret = nfs4_xattr_cache_list(inode, list, list_len); 7898 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7899 return ret; 7900 7901 cookie = 0; 7902 eof = false; 7903 buflen = list_len ? list_len : XATTR_LIST_MAX; 7904 buf = list_len ? list : NULL; 7905 size = 0; 7906 7907 while (!eof) { 7908 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7909 &cookie, &eof); 7910 if (ret < 0) 7911 return ret; 7912 7913 if (list_len) { 7914 buf += ret; 7915 buflen -= ret; 7916 } 7917 size += ret; 7918 } 7919 7920 if (list_len) 7921 nfs4_xattr_cache_set_list(inode, list, size); 7922 7923 return size; 7924 } 7925 7926 #else 7927 7928 static ssize_t 7929 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7930 { 7931 return 0; 7932 } 7933 #endif /* CONFIG_NFS_V4_2 */ 7934 7935 /* 7936 * nfs_fhget will use either the mounted_on_fileid or the fileid 7937 */ 7938 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7939 { 7940 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7941 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7942 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7943 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7944 return; 7945 7946 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7947 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7948 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7949 fattr->nlink = 2; 7950 } 7951 7952 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7953 const struct qstr *name, 7954 struct nfs4_fs_locations *fs_locations, 7955 struct page *page) 7956 { 7957 struct nfs_server *server = NFS_SERVER(dir); 7958 u32 bitmask[3]; 7959 struct nfs4_fs_locations_arg args = { 7960 .dir_fh = NFS_FH(dir), 7961 .name = name, 7962 .page = page, 7963 .bitmask = bitmask, 7964 }; 7965 struct nfs4_fs_locations_res res = { 7966 .fs_locations = fs_locations, 7967 }; 7968 struct rpc_message msg = { 7969 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7970 .rpc_argp = &args, 7971 .rpc_resp = &res, 7972 }; 7973 int status; 7974 7975 dprintk("%s: start\n", __func__); 7976 7977 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7978 bitmask[1] = nfs4_fattr_bitmap[1]; 7979 7980 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7981 * is not supported */ 7982 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7983 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7984 else 7985 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7986 7987 nfs_fattr_init(fs_locations->fattr); 7988 fs_locations->server = server; 7989 fs_locations->nlocations = 0; 7990 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7991 dprintk("%s: returned status = %d\n", __func__, status); 7992 return status; 7993 } 7994 7995 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7996 const struct qstr *name, 7997 struct nfs4_fs_locations *fs_locations, 7998 struct page *page) 7999 { 8000 struct nfs4_exception exception = { 8001 .interruptible = true, 8002 }; 8003 int err; 8004 do { 8005 err = _nfs4_proc_fs_locations(client, dir, name, 8006 fs_locations, page); 8007 trace_nfs4_get_fs_locations(dir, name, err); 8008 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8009 &exception); 8010 } while (exception.retry); 8011 return err; 8012 } 8013 8014 /* 8015 * This operation also signals the server that this client is 8016 * performing migration recovery. The server can stop returning 8017 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8018 * appended to this compound to identify the client ID which is 8019 * performing recovery. 8020 */ 8021 static int _nfs40_proc_get_locations(struct nfs_server *server, 8022 struct nfs_fh *fhandle, 8023 struct nfs4_fs_locations *locations, 8024 struct page *page, const struct cred *cred) 8025 { 8026 struct rpc_clnt *clnt = server->client; 8027 u32 bitmask[2] = { 8028 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8029 }; 8030 struct nfs4_fs_locations_arg args = { 8031 .clientid = server->nfs_client->cl_clientid, 8032 .fh = fhandle, 8033 .page = page, 8034 .bitmask = bitmask, 8035 .migration = 1, /* skip LOOKUP */ 8036 .renew = 1, /* append RENEW */ 8037 }; 8038 struct nfs4_fs_locations_res res = { 8039 .fs_locations = locations, 8040 .migration = 1, 8041 .renew = 1, 8042 }; 8043 struct rpc_message msg = { 8044 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8045 .rpc_argp = &args, 8046 .rpc_resp = &res, 8047 .rpc_cred = cred, 8048 }; 8049 unsigned long now = jiffies; 8050 int status; 8051 8052 nfs_fattr_init(locations->fattr); 8053 locations->server = server; 8054 locations->nlocations = 0; 8055 8056 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8057 status = nfs4_call_sync_sequence(clnt, server, &msg, 8058 &args.seq_args, &res.seq_res); 8059 if (status) 8060 return status; 8061 8062 renew_lease(server, now); 8063 return 0; 8064 } 8065 8066 #ifdef CONFIG_NFS_V4_1 8067 8068 /* 8069 * This operation also signals the server that this client is 8070 * performing migration recovery. The server can stop asserting 8071 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8072 * performing this operation is identified in the SEQUENCE 8073 * operation in this compound. 8074 * 8075 * When the client supports GETATTR(fs_locations_info), it can 8076 * be plumbed in here. 8077 */ 8078 static int _nfs41_proc_get_locations(struct nfs_server *server, 8079 struct nfs_fh *fhandle, 8080 struct nfs4_fs_locations *locations, 8081 struct page *page, const struct cred *cred) 8082 { 8083 struct rpc_clnt *clnt = server->client; 8084 u32 bitmask[2] = { 8085 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8086 }; 8087 struct nfs4_fs_locations_arg args = { 8088 .fh = fhandle, 8089 .page = page, 8090 .bitmask = bitmask, 8091 .migration = 1, /* skip LOOKUP */ 8092 }; 8093 struct nfs4_fs_locations_res res = { 8094 .fs_locations = locations, 8095 .migration = 1, 8096 }; 8097 struct rpc_message msg = { 8098 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8099 .rpc_argp = &args, 8100 .rpc_resp = &res, 8101 .rpc_cred = cred, 8102 }; 8103 struct nfs4_call_sync_data data = { 8104 .seq_server = server, 8105 .seq_args = &args.seq_args, 8106 .seq_res = &res.seq_res, 8107 }; 8108 struct rpc_task_setup task_setup_data = { 8109 .rpc_client = clnt, 8110 .rpc_message = &msg, 8111 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8112 .callback_data = &data, 8113 .flags = RPC_TASK_NO_ROUND_ROBIN, 8114 }; 8115 int status; 8116 8117 nfs_fattr_init(locations->fattr); 8118 locations->server = server; 8119 locations->nlocations = 0; 8120 8121 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8122 status = nfs4_call_sync_custom(&task_setup_data); 8123 if (status == NFS4_OK && 8124 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8125 status = -NFS4ERR_LEASE_MOVED; 8126 return status; 8127 } 8128 8129 #endif /* CONFIG_NFS_V4_1 */ 8130 8131 /** 8132 * nfs4_proc_get_locations - discover locations for a migrated FSID 8133 * @server: pointer to nfs_server to process 8134 * @fhandle: pointer to the kernel NFS client file handle 8135 * @locations: result of query 8136 * @page: buffer 8137 * @cred: credential to use for this operation 8138 * 8139 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8140 * operation failed, or a negative errno if a local error occurred. 8141 * 8142 * On success, "locations" is filled in, but if the server has 8143 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8144 * asserted. 8145 * 8146 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8147 * from this client that require migration recovery. 8148 */ 8149 int nfs4_proc_get_locations(struct nfs_server *server, 8150 struct nfs_fh *fhandle, 8151 struct nfs4_fs_locations *locations, 8152 struct page *page, const struct cred *cred) 8153 { 8154 struct nfs_client *clp = server->nfs_client; 8155 const struct nfs4_mig_recovery_ops *ops = 8156 clp->cl_mvops->mig_recovery_ops; 8157 struct nfs4_exception exception = { 8158 .interruptible = true, 8159 }; 8160 int status; 8161 8162 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8163 (unsigned long long)server->fsid.major, 8164 (unsigned long long)server->fsid.minor, 8165 clp->cl_hostname); 8166 nfs_display_fhandle(fhandle, __func__); 8167 8168 do { 8169 status = ops->get_locations(server, fhandle, locations, page, 8170 cred); 8171 if (status != -NFS4ERR_DELAY) 8172 break; 8173 nfs4_handle_exception(server, status, &exception); 8174 } while (exception.retry); 8175 return status; 8176 } 8177 8178 /* 8179 * This operation also signals the server that this client is 8180 * performing "lease moved" recovery. The server can stop 8181 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8182 * is appended to this compound to identify the client ID which is 8183 * performing recovery. 8184 */ 8185 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8186 { 8187 struct nfs_server *server = NFS_SERVER(inode); 8188 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8189 struct rpc_clnt *clnt = server->client; 8190 struct nfs4_fsid_present_arg args = { 8191 .fh = NFS_FH(inode), 8192 .clientid = clp->cl_clientid, 8193 .renew = 1, /* append RENEW */ 8194 }; 8195 struct nfs4_fsid_present_res res = { 8196 .renew = 1, 8197 }; 8198 struct rpc_message msg = { 8199 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8200 .rpc_argp = &args, 8201 .rpc_resp = &res, 8202 .rpc_cred = cred, 8203 }; 8204 unsigned long now = jiffies; 8205 int status; 8206 8207 res.fh = nfs_alloc_fhandle(); 8208 if (res.fh == NULL) 8209 return -ENOMEM; 8210 8211 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8212 status = nfs4_call_sync_sequence(clnt, server, &msg, 8213 &args.seq_args, &res.seq_res); 8214 nfs_free_fhandle(res.fh); 8215 if (status) 8216 return status; 8217 8218 do_renew_lease(clp, now); 8219 return 0; 8220 } 8221 8222 #ifdef CONFIG_NFS_V4_1 8223 8224 /* 8225 * This operation also signals the server that this client is 8226 * performing "lease moved" recovery. The server can stop asserting 8227 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8228 * this operation is identified in the SEQUENCE operation in this 8229 * compound. 8230 */ 8231 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8232 { 8233 struct nfs_server *server = NFS_SERVER(inode); 8234 struct rpc_clnt *clnt = server->client; 8235 struct nfs4_fsid_present_arg args = { 8236 .fh = NFS_FH(inode), 8237 }; 8238 struct nfs4_fsid_present_res res = { 8239 }; 8240 struct rpc_message msg = { 8241 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8242 .rpc_argp = &args, 8243 .rpc_resp = &res, 8244 .rpc_cred = cred, 8245 }; 8246 int status; 8247 8248 res.fh = nfs_alloc_fhandle(); 8249 if (res.fh == NULL) 8250 return -ENOMEM; 8251 8252 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8253 status = nfs4_call_sync_sequence(clnt, server, &msg, 8254 &args.seq_args, &res.seq_res); 8255 nfs_free_fhandle(res.fh); 8256 if (status == NFS4_OK && 8257 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8258 status = -NFS4ERR_LEASE_MOVED; 8259 return status; 8260 } 8261 8262 #endif /* CONFIG_NFS_V4_1 */ 8263 8264 /** 8265 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8266 * @inode: inode on FSID to check 8267 * @cred: credential to use for this operation 8268 * 8269 * Server indicates whether the FSID is present, moved, or not 8270 * recognized. This operation is necessary to clear a LEASE_MOVED 8271 * condition for this client ID. 8272 * 8273 * Returns NFS4_OK if the FSID is present on this server, 8274 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8275 * NFS4ERR code if some error occurred on the server, or a 8276 * negative errno if a local failure occurred. 8277 */ 8278 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8279 { 8280 struct nfs_server *server = NFS_SERVER(inode); 8281 struct nfs_client *clp = server->nfs_client; 8282 const struct nfs4_mig_recovery_ops *ops = 8283 clp->cl_mvops->mig_recovery_ops; 8284 struct nfs4_exception exception = { 8285 .interruptible = true, 8286 }; 8287 int status; 8288 8289 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8290 (unsigned long long)server->fsid.major, 8291 (unsigned long long)server->fsid.minor, 8292 clp->cl_hostname); 8293 nfs_display_fhandle(NFS_FH(inode), __func__); 8294 8295 do { 8296 status = ops->fsid_present(inode, cred); 8297 if (status != -NFS4ERR_DELAY) 8298 break; 8299 nfs4_handle_exception(server, status, &exception); 8300 } while (exception.retry); 8301 return status; 8302 } 8303 8304 /* 8305 * If 'use_integrity' is true and the state managment nfs_client 8306 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8307 * and the machine credential as per RFC3530bis and RFC5661 Security 8308 * Considerations sections. Otherwise, just use the user cred with the 8309 * filesystem's rpc_client. 8310 */ 8311 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8312 { 8313 int status; 8314 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8315 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8316 struct nfs4_secinfo_arg args = { 8317 .dir_fh = NFS_FH(dir), 8318 .name = name, 8319 }; 8320 struct nfs4_secinfo_res res = { 8321 .flavors = flavors, 8322 }; 8323 struct rpc_message msg = { 8324 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8325 .rpc_argp = &args, 8326 .rpc_resp = &res, 8327 }; 8328 struct nfs4_call_sync_data data = { 8329 .seq_server = NFS_SERVER(dir), 8330 .seq_args = &args.seq_args, 8331 .seq_res = &res.seq_res, 8332 }; 8333 struct rpc_task_setup task_setup = { 8334 .rpc_client = clnt, 8335 .rpc_message = &msg, 8336 .callback_ops = clp->cl_mvops->call_sync_ops, 8337 .callback_data = &data, 8338 .flags = RPC_TASK_NO_ROUND_ROBIN, 8339 }; 8340 const struct cred *cred = NULL; 8341 8342 if (use_integrity) { 8343 clnt = clp->cl_rpcclient; 8344 task_setup.rpc_client = clnt; 8345 8346 cred = nfs4_get_clid_cred(clp); 8347 msg.rpc_cred = cred; 8348 } 8349 8350 dprintk("NFS call secinfo %s\n", name->name); 8351 8352 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8353 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8354 status = nfs4_call_sync_custom(&task_setup); 8355 8356 dprintk("NFS reply secinfo: %d\n", status); 8357 8358 put_cred(cred); 8359 return status; 8360 } 8361 8362 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8363 struct nfs4_secinfo_flavors *flavors) 8364 { 8365 struct nfs4_exception exception = { 8366 .interruptible = true, 8367 }; 8368 int err; 8369 do { 8370 err = -NFS4ERR_WRONGSEC; 8371 8372 /* try to use integrity protection with machine cred */ 8373 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8374 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8375 8376 /* 8377 * if unable to use integrity protection, or SECINFO with 8378 * integrity protection returns NFS4ERR_WRONGSEC (which is 8379 * disallowed by spec, but exists in deployed servers) use 8380 * the current filesystem's rpc_client and the user cred. 8381 */ 8382 if (err == -NFS4ERR_WRONGSEC) 8383 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8384 8385 trace_nfs4_secinfo(dir, name, err); 8386 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8387 &exception); 8388 } while (exception.retry); 8389 return err; 8390 } 8391 8392 #ifdef CONFIG_NFS_V4_1 8393 /* 8394 * Check the exchange flags returned by the server for invalid flags, having 8395 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8396 * DS flags set. 8397 */ 8398 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8399 { 8400 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8401 goto out_inval; 8402 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8403 goto out_inval; 8404 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8405 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8406 goto out_inval; 8407 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8408 goto out_inval; 8409 return NFS_OK; 8410 out_inval: 8411 return -NFS4ERR_INVAL; 8412 } 8413 8414 static bool 8415 nfs41_same_server_scope(struct nfs41_server_scope *a, 8416 struct nfs41_server_scope *b) 8417 { 8418 if (a->server_scope_sz != b->server_scope_sz) 8419 return false; 8420 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8421 } 8422 8423 static void 8424 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8425 { 8426 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8427 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8428 struct nfs_client *clp = args->client; 8429 8430 switch (task->tk_status) { 8431 case -NFS4ERR_BADSESSION: 8432 case -NFS4ERR_DEADSESSION: 8433 nfs4_schedule_session_recovery(clp->cl_session, 8434 task->tk_status); 8435 return; 8436 } 8437 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8438 res->dir != NFS4_CDFS4_BOTH) { 8439 rpc_task_close_connection(task); 8440 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8441 rpc_restart_call(task); 8442 } 8443 } 8444 8445 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8446 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8447 }; 8448 8449 /* 8450 * nfs4_proc_bind_one_conn_to_session() 8451 * 8452 * The 4.1 client currently uses the same TCP connection for the 8453 * fore and backchannel. 8454 */ 8455 static 8456 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8457 struct rpc_xprt *xprt, 8458 struct nfs_client *clp, 8459 const struct cred *cred) 8460 { 8461 int status; 8462 struct nfs41_bind_conn_to_session_args args = { 8463 .client = clp, 8464 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8465 .retries = 0, 8466 }; 8467 struct nfs41_bind_conn_to_session_res res; 8468 struct rpc_message msg = { 8469 .rpc_proc = 8470 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8471 .rpc_argp = &args, 8472 .rpc_resp = &res, 8473 .rpc_cred = cred, 8474 }; 8475 struct rpc_task_setup task_setup_data = { 8476 .rpc_client = clnt, 8477 .rpc_xprt = xprt, 8478 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8479 .rpc_message = &msg, 8480 .flags = RPC_TASK_TIMEOUT, 8481 }; 8482 struct rpc_task *task; 8483 8484 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8485 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8486 args.dir = NFS4_CDFC4_FORE; 8487 8488 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8489 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8490 args.dir = NFS4_CDFC4_FORE; 8491 8492 task = rpc_run_task(&task_setup_data); 8493 if (!IS_ERR(task)) { 8494 status = task->tk_status; 8495 rpc_put_task(task); 8496 } else 8497 status = PTR_ERR(task); 8498 trace_nfs4_bind_conn_to_session(clp, status); 8499 if (status == 0) { 8500 if (memcmp(res.sessionid.data, 8501 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8502 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8503 return -EIO; 8504 } 8505 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8506 dprintk("NFS: %s: Unexpected direction from server\n", 8507 __func__); 8508 return -EIO; 8509 } 8510 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8511 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8512 __func__); 8513 return -EIO; 8514 } 8515 } 8516 8517 return status; 8518 } 8519 8520 struct rpc_bind_conn_calldata { 8521 struct nfs_client *clp; 8522 const struct cred *cred; 8523 }; 8524 8525 static int 8526 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8527 struct rpc_xprt *xprt, 8528 void *calldata) 8529 { 8530 struct rpc_bind_conn_calldata *p = calldata; 8531 8532 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8533 } 8534 8535 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8536 { 8537 struct rpc_bind_conn_calldata data = { 8538 .clp = clp, 8539 .cred = cred, 8540 }; 8541 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8542 nfs4_proc_bind_conn_to_session_callback, &data); 8543 } 8544 8545 /* 8546 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8547 * and operations we'd like to see to enable certain features in the allow map 8548 */ 8549 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8550 .how = SP4_MACH_CRED, 8551 .enforce.u.words = { 8552 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8553 1 << (OP_EXCHANGE_ID - 32) | 8554 1 << (OP_CREATE_SESSION - 32) | 8555 1 << (OP_DESTROY_SESSION - 32) | 8556 1 << (OP_DESTROY_CLIENTID - 32) 8557 }, 8558 .allow.u.words = { 8559 [0] = 1 << (OP_CLOSE) | 8560 1 << (OP_OPEN_DOWNGRADE) | 8561 1 << (OP_LOCKU) | 8562 1 << (OP_DELEGRETURN) | 8563 1 << (OP_COMMIT), 8564 [1] = 1 << (OP_SECINFO - 32) | 8565 1 << (OP_SECINFO_NO_NAME - 32) | 8566 1 << (OP_LAYOUTRETURN - 32) | 8567 1 << (OP_TEST_STATEID - 32) | 8568 1 << (OP_FREE_STATEID - 32) | 8569 1 << (OP_WRITE - 32) 8570 } 8571 }; 8572 8573 /* 8574 * Select the state protection mode for client `clp' given the server results 8575 * from exchange_id in `sp'. 8576 * 8577 * Returns 0 on success, negative errno otherwise. 8578 */ 8579 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8580 struct nfs41_state_protection *sp) 8581 { 8582 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8583 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8584 1 << (OP_EXCHANGE_ID - 32) | 8585 1 << (OP_CREATE_SESSION - 32) | 8586 1 << (OP_DESTROY_SESSION - 32) | 8587 1 << (OP_DESTROY_CLIENTID - 32) 8588 }; 8589 unsigned long flags = 0; 8590 unsigned int i; 8591 int ret = 0; 8592 8593 if (sp->how == SP4_MACH_CRED) { 8594 /* Print state protect result */ 8595 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8596 for (i = 0; i <= LAST_NFS4_OP; i++) { 8597 if (test_bit(i, sp->enforce.u.longs)) 8598 dfprintk(MOUNT, " enforce op %d\n", i); 8599 if (test_bit(i, sp->allow.u.longs)) 8600 dfprintk(MOUNT, " allow op %d\n", i); 8601 } 8602 8603 /* make sure nothing is on enforce list that isn't supported */ 8604 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8605 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8606 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8607 ret = -EINVAL; 8608 goto out; 8609 } 8610 } 8611 8612 /* 8613 * Minimal mode - state operations are allowed to use machine 8614 * credential. Note this already happens by default, so the 8615 * client doesn't have to do anything more than the negotiation. 8616 * 8617 * NOTE: we don't care if EXCHANGE_ID is in the list - 8618 * we're already using the machine cred for exchange_id 8619 * and will never use a different cred. 8620 */ 8621 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8622 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8623 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8624 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8625 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8626 dfprintk(MOUNT, " minimal mode enabled\n"); 8627 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8628 } else { 8629 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8630 ret = -EINVAL; 8631 goto out; 8632 } 8633 8634 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8635 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8636 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8637 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8638 dfprintk(MOUNT, " cleanup mode enabled\n"); 8639 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8640 } 8641 8642 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8643 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8644 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8645 } 8646 8647 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8648 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8649 dfprintk(MOUNT, " secinfo mode enabled\n"); 8650 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8651 } 8652 8653 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8654 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8655 dfprintk(MOUNT, " stateid mode enabled\n"); 8656 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8657 } 8658 8659 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8660 dfprintk(MOUNT, " write mode enabled\n"); 8661 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8662 } 8663 8664 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8665 dfprintk(MOUNT, " commit mode enabled\n"); 8666 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8667 } 8668 } 8669 out: 8670 clp->cl_sp4_flags = flags; 8671 return ret; 8672 } 8673 8674 struct nfs41_exchange_id_data { 8675 struct nfs41_exchange_id_res res; 8676 struct nfs41_exchange_id_args args; 8677 }; 8678 8679 static void nfs4_exchange_id_release(void *data) 8680 { 8681 struct nfs41_exchange_id_data *cdata = 8682 (struct nfs41_exchange_id_data *)data; 8683 8684 nfs_put_client(cdata->args.client); 8685 kfree(cdata->res.impl_id); 8686 kfree(cdata->res.server_scope); 8687 kfree(cdata->res.server_owner); 8688 kfree(cdata); 8689 } 8690 8691 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8692 .rpc_release = nfs4_exchange_id_release, 8693 }; 8694 8695 /* 8696 * _nfs4_proc_exchange_id() 8697 * 8698 * Wrapper for EXCHANGE_ID operation. 8699 */ 8700 static struct rpc_task * 8701 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8702 u32 sp4_how, struct rpc_xprt *xprt) 8703 { 8704 struct rpc_message msg = { 8705 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8706 .rpc_cred = cred, 8707 }; 8708 struct rpc_task_setup task_setup_data = { 8709 .rpc_client = clp->cl_rpcclient, 8710 .callback_ops = &nfs4_exchange_id_call_ops, 8711 .rpc_message = &msg, 8712 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8713 }; 8714 struct nfs41_exchange_id_data *calldata; 8715 int status; 8716 8717 if (!refcount_inc_not_zero(&clp->cl_count)) 8718 return ERR_PTR(-EIO); 8719 8720 status = -ENOMEM; 8721 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8722 if (!calldata) 8723 goto out; 8724 8725 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8726 8727 status = nfs4_init_uniform_client_string(clp); 8728 if (status) 8729 goto out_calldata; 8730 8731 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8732 GFP_NOFS); 8733 status = -ENOMEM; 8734 if (unlikely(calldata->res.server_owner == NULL)) 8735 goto out_calldata; 8736 8737 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8738 GFP_NOFS); 8739 if (unlikely(calldata->res.server_scope == NULL)) 8740 goto out_server_owner; 8741 8742 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8743 if (unlikely(calldata->res.impl_id == NULL)) 8744 goto out_server_scope; 8745 8746 switch (sp4_how) { 8747 case SP4_NONE: 8748 calldata->args.state_protect.how = SP4_NONE; 8749 break; 8750 8751 case SP4_MACH_CRED: 8752 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8753 break; 8754 8755 default: 8756 /* unsupported! */ 8757 WARN_ON_ONCE(1); 8758 status = -EINVAL; 8759 goto out_impl_id; 8760 } 8761 if (xprt) { 8762 task_setup_data.rpc_xprt = xprt; 8763 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8764 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8765 sizeof(calldata->args.verifier.data)); 8766 } 8767 calldata->args.client = clp; 8768 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8769 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8770 #ifdef CONFIG_NFS_V4_1_MIGRATION 8771 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8772 #endif 8773 msg.rpc_argp = &calldata->args; 8774 msg.rpc_resp = &calldata->res; 8775 task_setup_data.callback_data = calldata; 8776 8777 return rpc_run_task(&task_setup_data); 8778 8779 out_impl_id: 8780 kfree(calldata->res.impl_id); 8781 out_server_scope: 8782 kfree(calldata->res.server_scope); 8783 out_server_owner: 8784 kfree(calldata->res.server_owner); 8785 out_calldata: 8786 kfree(calldata); 8787 out: 8788 nfs_put_client(clp); 8789 return ERR_PTR(status); 8790 } 8791 8792 /* 8793 * _nfs4_proc_exchange_id() 8794 * 8795 * Wrapper for EXCHANGE_ID operation. 8796 */ 8797 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8798 u32 sp4_how) 8799 { 8800 struct rpc_task *task; 8801 struct nfs41_exchange_id_args *argp; 8802 struct nfs41_exchange_id_res *resp; 8803 unsigned long now = jiffies; 8804 int status; 8805 8806 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8807 if (IS_ERR(task)) 8808 return PTR_ERR(task); 8809 8810 argp = task->tk_msg.rpc_argp; 8811 resp = task->tk_msg.rpc_resp; 8812 status = task->tk_status; 8813 if (status != 0) 8814 goto out; 8815 8816 status = nfs4_check_cl_exchange_flags(resp->flags, 8817 clp->cl_mvops->minor_version); 8818 if (status != 0) 8819 goto out; 8820 8821 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8822 if (status != 0) 8823 goto out; 8824 8825 do_renew_lease(clp, now); 8826 8827 clp->cl_clientid = resp->clientid; 8828 clp->cl_exchange_flags = resp->flags; 8829 clp->cl_seqid = resp->seqid; 8830 /* Client ID is not confirmed */ 8831 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8832 clear_bit(NFS4_SESSION_ESTABLISHED, 8833 &clp->cl_session->session_state); 8834 8835 if (clp->cl_serverscope != NULL && 8836 !nfs41_same_server_scope(clp->cl_serverscope, 8837 resp->server_scope)) { 8838 dprintk("%s: server_scope mismatch detected\n", 8839 __func__); 8840 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8841 } 8842 8843 swap(clp->cl_serverowner, resp->server_owner); 8844 swap(clp->cl_serverscope, resp->server_scope); 8845 swap(clp->cl_implid, resp->impl_id); 8846 8847 /* Save the EXCHANGE_ID verifier session trunk tests */ 8848 memcpy(clp->cl_confirm.data, argp->verifier.data, 8849 sizeof(clp->cl_confirm.data)); 8850 out: 8851 trace_nfs4_exchange_id(clp, status); 8852 rpc_put_task(task); 8853 return status; 8854 } 8855 8856 /* 8857 * nfs4_proc_exchange_id() 8858 * 8859 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8860 * 8861 * Since the clientid has expired, all compounds using sessions 8862 * associated with the stale clientid will be returning 8863 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8864 * be in some phase of session reset. 8865 * 8866 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8867 */ 8868 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8869 { 8870 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8871 int status; 8872 8873 /* try SP4_MACH_CRED if krb5i/p */ 8874 if (authflavor == RPC_AUTH_GSS_KRB5I || 8875 authflavor == RPC_AUTH_GSS_KRB5P) { 8876 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8877 if (!status) 8878 return 0; 8879 } 8880 8881 /* try SP4_NONE */ 8882 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8883 } 8884 8885 /** 8886 * nfs4_test_session_trunk 8887 * 8888 * This is an add_xprt_test() test function called from 8889 * rpc_clnt_setup_test_and_add_xprt. 8890 * 8891 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8892 * and is dereferrenced in nfs4_exchange_id_release 8893 * 8894 * Upon success, add the new transport to the rpc_clnt 8895 * 8896 * @clnt: struct rpc_clnt to get new transport 8897 * @xprt: the rpc_xprt to test 8898 * @data: call data for _nfs4_proc_exchange_id. 8899 */ 8900 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8901 void *data) 8902 { 8903 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 8904 struct rpc_task *task; 8905 int status; 8906 8907 u32 sp4_how; 8908 8909 dprintk("--> %s try %s\n", __func__, 8910 xprt->address_strings[RPC_DISPLAY_ADDR]); 8911 8912 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8913 8914 /* Test connection for session trunking. Async exchange_id call */ 8915 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8916 if (IS_ERR(task)) 8917 return; 8918 8919 status = task->tk_status; 8920 if (status == 0) 8921 status = nfs4_detect_session_trunking(adata->clp, 8922 task->tk_msg.rpc_resp, xprt); 8923 8924 if (status == 0) 8925 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8926 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8927 (struct sockaddr *)&xprt->addr)) 8928 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8929 8930 rpc_put_task(task); 8931 } 8932 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8933 8934 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8935 const struct cred *cred) 8936 { 8937 struct rpc_message msg = { 8938 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8939 .rpc_argp = clp, 8940 .rpc_cred = cred, 8941 }; 8942 int status; 8943 8944 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8945 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8946 trace_nfs4_destroy_clientid(clp, status); 8947 if (status) 8948 dprintk("NFS: Got error %d from the server %s on " 8949 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8950 return status; 8951 } 8952 8953 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8954 const struct cred *cred) 8955 { 8956 unsigned int loop; 8957 int ret; 8958 8959 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8960 ret = _nfs4_proc_destroy_clientid(clp, cred); 8961 switch (ret) { 8962 case -NFS4ERR_DELAY: 8963 case -NFS4ERR_CLIENTID_BUSY: 8964 ssleep(1); 8965 break; 8966 default: 8967 return ret; 8968 } 8969 } 8970 return 0; 8971 } 8972 8973 int nfs4_destroy_clientid(struct nfs_client *clp) 8974 { 8975 const struct cred *cred; 8976 int ret = 0; 8977 8978 if (clp->cl_mvops->minor_version < 1) 8979 goto out; 8980 if (clp->cl_exchange_flags == 0) 8981 goto out; 8982 if (clp->cl_preserve_clid) 8983 goto out; 8984 cred = nfs4_get_clid_cred(clp); 8985 ret = nfs4_proc_destroy_clientid(clp, cred); 8986 put_cred(cred); 8987 switch (ret) { 8988 case 0: 8989 case -NFS4ERR_STALE_CLIENTID: 8990 clp->cl_exchange_flags = 0; 8991 } 8992 out: 8993 return ret; 8994 } 8995 8996 #endif /* CONFIG_NFS_V4_1 */ 8997 8998 struct nfs4_get_lease_time_data { 8999 struct nfs4_get_lease_time_args *args; 9000 struct nfs4_get_lease_time_res *res; 9001 struct nfs_client *clp; 9002 }; 9003 9004 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9005 void *calldata) 9006 { 9007 struct nfs4_get_lease_time_data *data = 9008 (struct nfs4_get_lease_time_data *)calldata; 9009 9010 /* just setup sequence, do not trigger session recovery 9011 since we're invoked within one */ 9012 nfs4_setup_sequence(data->clp, 9013 &data->args->la_seq_args, 9014 &data->res->lr_seq_res, 9015 task); 9016 } 9017 9018 /* 9019 * Called from nfs4_state_manager thread for session setup, so don't recover 9020 * from sequence operation or clientid errors. 9021 */ 9022 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9023 { 9024 struct nfs4_get_lease_time_data *data = 9025 (struct nfs4_get_lease_time_data *)calldata; 9026 9027 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9028 return; 9029 switch (task->tk_status) { 9030 case -NFS4ERR_DELAY: 9031 case -NFS4ERR_GRACE: 9032 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9033 task->tk_status = 0; 9034 fallthrough; 9035 case -NFS4ERR_RETRY_UNCACHED_REP: 9036 rpc_restart_call_prepare(task); 9037 return; 9038 } 9039 } 9040 9041 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9042 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9043 .rpc_call_done = nfs4_get_lease_time_done, 9044 }; 9045 9046 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9047 { 9048 struct nfs4_get_lease_time_args args; 9049 struct nfs4_get_lease_time_res res = { 9050 .lr_fsinfo = fsinfo, 9051 }; 9052 struct nfs4_get_lease_time_data data = { 9053 .args = &args, 9054 .res = &res, 9055 .clp = clp, 9056 }; 9057 struct rpc_message msg = { 9058 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9059 .rpc_argp = &args, 9060 .rpc_resp = &res, 9061 }; 9062 struct rpc_task_setup task_setup = { 9063 .rpc_client = clp->cl_rpcclient, 9064 .rpc_message = &msg, 9065 .callback_ops = &nfs4_get_lease_time_ops, 9066 .callback_data = &data, 9067 .flags = RPC_TASK_TIMEOUT, 9068 }; 9069 9070 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9071 return nfs4_call_sync_custom(&task_setup); 9072 } 9073 9074 #ifdef CONFIG_NFS_V4_1 9075 9076 /* 9077 * Initialize the values to be used by the client in CREATE_SESSION 9078 * If nfs4_init_session set the fore channel request and response sizes, 9079 * use them. 9080 * 9081 * Set the back channel max_resp_sz_cached to zero to force the client to 9082 * always set csa_cachethis to FALSE because the current implementation 9083 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9084 */ 9085 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9086 struct rpc_clnt *clnt) 9087 { 9088 unsigned int max_rqst_sz, max_resp_sz; 9089 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9090 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9091 9092 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9093 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9094 9095 /* Fore channel attributes */ 9096 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9097 args->fc_attrs.max_resp_sz = max_resp_sz; 9098 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9099 args->fc_attrs.max_reqs = max_session_slots; 9100 9101 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9102 "max_ops=%u max_reqs=%u\n", 9103 __func__, 9104 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9105 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9106 9107 /* Back channel attributes */ 9108 args->bc_attrs.max_rqst_sz = max_bc_payload; 9109 args->bc_attrs.max_resp_sz = max_bc_payload; 9110 args->bc_attrs.max_resp_sz_cached = 0; 9111 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9112 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9113 if (args->bc_attrs.max_reqs > max_bc_slots) 9114 args->bc_attrs.max_reqs = max_bc_slots; 9115 9116 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9117 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9118 __func__, 9119 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9120 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9121 args->bc_attrs.max_reqs); 9122 } 9123 9124 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9125 struct nfs41_create_session_res *res) 9126 { 9127 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9128 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9129 9130 if (rcvd->max_resp_sz > sent->max_resp_sz) 9131 return -EINVAL; 9132 /* 9133 * Our requested max_ops is the minimum we need; we're not 9134 * prepared to break up compounds into smaller pieces than that. 9135 * So, no point even trying to continue if the server won't 9136 * cooperate: 9137 */ 9138 if (rcvd->max_ops < sent->max_ops) 9139 return -EINVAL; 9140 if (rcvd->max_reqs == 0) 9141 return -EINVAL; 9142 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9143 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9144 return 0; 9145 } 9146 9147 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9148 struct nfs41_create_session_res *res) 9149 { 9150 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9151 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9152 9153 if (!(res->flags & SESSION4_BACK_CHAN)) 9154 goto out; 9155 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9156 return -EINVAL; 9157 if (rcvd->max_resp_sz < sent->max_resp_sz) 9158 return -EINVAL; 9159 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9160 return -EINVAL; 9161 if (rcvd->max_ops > sent->max_ops) 9162 return -EINVAL; 9163 if (rcvd->max_reqs > sent->max_reqs) 9164 return -EINVAL; 9165 out: 9166 return 0; 9167 } 9168 9169 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9170 struct nfs41_create_session_res *res) 9171 { 9172 int ret; 9173 9174 ret = nfs4_verify_fore_channel_attrs(args, res); 9175 if (ret) 9176 return ret; 9177 return nfs4_verify_back_channel_attrs(args, res); 9178 } 9179 9180 static void nfs4_update_session(struct nfs4_session *session, 9181 struct nfs41_create_session_res *res) 9182 { 9183 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9184 /* Mark client id and session as being confirmed */ 9185 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9186 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9187 session->flags = res->flags; 9188 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9189 if (res->flags & SESSION4_BACK_CHAN) 9190 memcpy(&session->bc_attrs, &res->bc_attrs, 9191 sizeof(session->bc_attrs)); 9192 } 9193 9194 static int _nfs4_proc_create_session(struct nfs_client *clp, 9195 const struct cred *cred) 9196 { 9197 struct nfs4_session *session = clp->cl_session; 9198 struct nfs41_create_session_args args = { 9199 .client = clp, 9200 .clientid = clp->cl_clientid, 9201 .seqid = clp->cl_seqid, 9202 .cb_program = NFS4_CALLBACK, 9203 }; 9204 struct nfs41_create_session_res res; 9205 9206 struct rpc_message msg = { 9207 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9208 .rpc_argp = &args, 9209 .rpc_resp = &res, 9210 .rpc_cred = cred, 9211 }; 9212 int status; 9213 9214 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9215 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9216 9217 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9218 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9219 trace_nfs4_create_session(clp, status); 9220 9221 switch (status) { 9222 case -NFS4ERR_STALE_CLIENTID: 9223 case -NFS4ERR_DELAY: 9224 case -ETIMEDOUT: 9225 case -EACCES: 9226 case -EAGAIN: 9227 goto out; 9228 } 9229 9230 clp->cl_seqid++; 9231 if (!status) { 9232 /* Verify the session's negotiated channel_attrs values */ 9233 status = nfs4_verify_channel_attrs(&args, &res); 9234 /* Increment the clientid slot sequence id */ 9235 if (status) 9236 goto out; 9237 nfs4_update_session(session, &res); 9238 } 9239 out: 9240 return status; 9241 } 9242 9243 /* 9244 * Issues a CREATE_SESSION operation to the server. 9245 * It is the responsibility of the caller to verify the session is 9246 * expired before calling this routine. 9247 */ 9248 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9249 { 9250 int status; 9251 unsigned *ptr; 9252 struct nfs4_session *session = clp->cl_session; 9253 struct nfs4_add_xprt_data xprtdata = { 9254 .clp = clp, 9255 }; 9256 struct rpc_add_xprt_test rpcdata = { 9257 .add_xprt_test = clp->cl_mvops->session_trunk, 9258 .data = &xprtdata, 9259 }; 9260 9261 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9262 9263 status = _nfs4_proc_create_session(clp, cred); 9264 if (status) 9265 goto out; 9266 9267 /* Init or reset the session slot tables */ 9268 status = nfs4_setup_session_slot_tables(session); 9269 dprintk("slot table setup returned %d\n", status); 9270 if (status) 9271 goto out; 9272 9273 ptr = (unsigned *)&session->sess_id.data[0]; 9274 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9275 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9276 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9277 out: 9278 return status; 9279 } 9280 9281 /* 9282 * Issue the over-the-wire RPC DESTROY_SESSION. 9283 * The caller must serialize access to this routine. 9284 */ 9285 int nfs4_proc_destroy_session(struct nfs4_session *session, 9286 const struct cred *cred) 9287 { 9288 struct rpc_message msg = { 9289 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9290 .rpc_argp = session, 9291 .rpc_cred = cred, 9292 }; 9293 int status = 0; 9294 9295 /* session is still being setup */ 9296 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9297 return 0; 9298 9299 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9300 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9301 trace_nfs4_destroy_session(session->clp, status); 9302 9303 if (status) 9304 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9305 "Session has been destroyed regardless...\n", status); 9306 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9307 return status; 9308 } 9309 9310 /* 9311 * Renew the cl_session lease. 9312 */ 9313 struct nfs4_sequence_data { 9314 struct nfs_client *clp; 9315 struct nfs4_sequence_args args; 9316 struct nfs4_sequence_res res; 9317 }; 9318 9319 static void nfs41_sequence_release(void *data) 9320 { 9321 struct nfs4_sequence_data *calldata = data; 9322 struct nfs_client *clp = calldata->clp; 9323 9324 if (refcount_read(&clp->cl_count) > 1) 9325 nfs4_schedule_state_renewal(clp); 9326 nfs_put_client(clp); 9327 kfree(calldata); 9328 } 9329 9330 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9331 { 9332 switch(task->tk_status) { 9333 case -NFS4ERR_DELAY: 9334 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9335 return -EAGAIN; 9336 default: 9337 nfs4_schedule_lease_recovery(clp); 9338 } 9339 return 0; 9340 } 9341 9342 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9343 { 9344 struct nfs4_sequence_data *calldata = data; 9345 struct nfs_client *clp = calldata->clp; 9346 9347 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9348 return; 9349 9350 trace_nfs4_sequence(clp, task->tk_status); 9351 if (task->tk_status < 0) { 9352 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9353 if (refcount_read(&clp->cl_count) == 1) 9354 return; 9355 9356 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9357 rpc_restart_call_prepare(task); 9358 return; 9359 } 9360 } 9361 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9362 } 9363 9364 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9365 { 9366 struct nfs4_sequence_data *calldata = data; 9367 struct nfs_client *clp = calldata->clp; 9368 struct nfs4_sequence_args *args; 9369 struct nfs4_sequence_res *res; 9370 9371 args = task->tk_msg.rpc_argp; 9372 res = task->tk_msg.rpc_resp; 9373 9374 nfs4_setup_sequence(clp, args, res, task); 9375 } 9376 9377 static const struct rpc_call_ops nfs41_sequence_ops = { 9378 .rpc_call_done = nfs41_sequence_call_done, 9379 .rpc_call_prepare = nfs41_sequence_prepare, 9380 .rpc_release = nfs41_sequence_release, 9381 }; 9382 9383 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9384 const struct cred *cred, 9385 struct nfs4_slot *slot, 9386 bool is_privileged) 9387 { 9388 struct nfs4_sequence_data *calldata; 9389 struct rpc_message msg = { 9390 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9391 .rpc_cred = cred, 9392 }; 9393 struct rpc_task_setup task_setup_data = { 9394 .rpc_client = clp->cl_rpcclient, 9395 .rpc_message = &msg, 9396 .callback_ops = &nfs41_sequence_ops, 9397 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9398 }; 9399 struct rpc_task *ret; 9400 9401 ret = ERR_PTR(-EIO); 9402 if (!refcount_inc_not_zero(&clp->cl_count)) 9403 goto out_err; 9404 9405 ret = ERR_PTR(-ENOMEM); 9406 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9407 if (calldata == NULL) 9408 goto out_put_clp; 9409 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9410 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9411 msg.rpc_argp = &calldata->args; 9412 msg.rpc_resp = &calldata->res; 9413 calldata->clp = clp; 9414 task_setup_data.callback_data = calldata; 9415 9416 ret = rpc_run_task(&task_setup_data); 9417 if (IS_ERR(ret)) 9418 goto out_err; 9419 return ret; 9420 out_put_clp: 9421 nfs_put_client(clp); 9422 out_err: 9423 nfs41_release_slot(slot); 9424 return ret; 9425 } 9426 9427 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9428 { 9429 struct rpc_task *task; 9430 int ret = 0; 9431 9432 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9433 return -EAGAIN; 9434 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9435 if (IS_ERR(task)) 9436 ret = PTR_ERR(task); 9437 else 9438 rpc_put_task_async(task); 9439 dprintk("<-- %s status=%d\n", __func__, ret); 9440 return ret; 9441 } 9442 9443 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9444 { 9445 struct rpc_task *task; 9446 int ret; 9447 9448 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9449 if (IS_ERR(task)) { 9450 ret = PTR_ERR(task); 9451 goto out; 9452 } 9453 ret = rpc_wait_for_completion_task(task); 9454 if (!ret) 9455 ret = task->tk_status; 9456 rpc_put_task(task); 9457 out: 9458 dprintk("<-- %s status=%d\n", __func__, ret); 9459 return ret; 9460 } 9461 9462 struct nfs4_reclaim_complete_data { 9463 struct nfs_client *clp; 9464 struct nfs41_reclaim_complete_args arg; 9465 struct nfs41_reclaim_complete_res res; 9466 }; 9467 9468 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9469 { 9470 struct nfs4_reclaim_complete_data *calldata = data; 9471 9472 nfs4_setup_sequence(calldata->clp, 9473 &calldata->arg.seq_args, 9474 &calldata->res.seq_res, 9475 task); 9476 } 9477 9478 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9479 { 9480 switch(task->tk_status) { 9481 case 0: 9482 wake_up_all(&clp->cl_lock_waitq); 9483 fallthrough; 9484 case -NFS4ERR_COMPLETE_ALREADY: 9485 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9486 break; 9487 case -NFS4ERR_DELAY: 9488 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9489 fallthrough; 9490 case -NFS4ERR_RETRY_UNCACHED_REP: 9491 case -EACCES: 9492 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9493 __func__, task->tk_status, clp->cl_hostname); 9494 return -EAGAIN; 9495 case -NFS4ERR_BADSESSION: 9496 case -NFS4ERR_DEADSESSION: 9497 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9498 break; 9499 default: 9500 nfs4_schedule_lease_recovery(clp); 9501 } 9502 return 0; 9503 } 9504 9505 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9506 { 9507 struct nfs4_reclaim_complete_data *calldata = data; 9508 struct nfs_client *clp = calldata->clp; 9509 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9510 9511 if (!nfs41_sequence_done(task, res)) 9512 return; 9513 9514 trace_nfs4_reclaim_complete(clp, task->tk_status); 9515 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9516 rpc_restart_call_prepare(task); 9517 return; 9518 } 9519 } 9520 9521 static void nfs4_free_reclaim_complete_data(void *data) 9522 { 9523 struct nfs4_reclaim_complete_data *calldata = data; 9524 9525 kfree(calldata); 9526 } 9527 9528 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9529 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9530 .rpc_call_done = nfs4_reclaim_complete_done, 9531 .rpc_release = nfs4_free_reclaim_complete_data, 9532 }; 9533 9534 /* 9535 * Issue a global reclaim complete. 9536 */ 9537 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9538 const struct cred *cred) 9539 { 9540 struct nfs4_reclaim_complete_data *calldata; 9541 struct rpc_message msg = { 9542 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9543 .rpc_cred = cred, 9544 }; 9545 struct rpc_task_setup task_setup_data = { 9546 .rpc_client = clp->cl_rpcclient, 9547 .rpc_message = &msg, 9548 .callback_ops = &nfs4_reclaim_complete_call_ops, 9549 .flags = RPC_TASK_NO_ROUND_ROBIN, 9550 }; 9551 int status = -ENOMEM; 9552 9553 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9554 if (calldata == NULL) 9555 goto out; 9556 calldata->clp = clp; 9557 calldata->arg.one_fs = 0; 9558 9559 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9560 msg.rpc_argp = &calldata->arg; 9561 msg.rpc_resp = &calldata->res; 9562 task_setup_data.callback_data = calldata; 9563 status = nfs4_call_sync_custom(&task_setup_data); 9564 out: 9565 dprintk("<-- %s status=%d\n", __func__, status); 9566 return status; 9567 } 9568 9569 static void 9570 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9571 { 9572 struct nfs4_layoutget *lgp = calldata; 9573 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9574 9575 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9576 &lgp->res.seq_res, task); 9577 } 9578 9579 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9580 { 9581 struct nfs4_layoutget *lgp = calldata; 9582 9583 nfs41_sequence_process(task, &lgp->res.seq_res); 9584 } 9585 9586 static int 9587 nfs4_layoutget_handle_exception(struct rpc_task *task, 9588 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9589 { 9590 struct inode *inode = lgp->args.inode; 9591 struct nfs_server *server = NFS_SERVER(inode); 9592 struct pnfs_layout_hdr *lo = lgp->lo; 9593 int nfs4err = task->tk_status; 9594 int err, status = 0; 9595 LIST_HEAD(head); 9596 9597 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9598 9599 nfs4_sequence_free_slot(&lgp->res.seq_res); 9600 9601 switch (nfs4err) { 9602 case 0: 9603 goto out; 9604 9605 /* 9606 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9607 * on the file. set tk_status to -ENODATA to tell upper layer to 9608 * retry go inband. 9609 */ 9610 case -NFS4ERR_LAYOUTUNAVAILABLE: 9611 status = -ENODATA; 9612 goto out; 9613 /* 9614 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9615 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9616 */ 9617 case -NFS4ERR_BADLAYOUT: 9618 status = -EOVERFLOW; 9619 goto out; 9620 /* 9621 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9622 * (or clients) writing to the same RAID stripe except when 9623 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9624 * 9625 * Treat it like we would RECALLCONFLICT -- we retry for a little 9626 * while, and then eventually give up. 9627 */ 9628 case -NFS4ERR_LAYOUTTRYLATER: 9629 if (lgp->args.minlength == 0) { 9630 status = -EOVERFLOW; 9631 goto out; 9632 } 9633 status = -EBUSY; 9634 break; 9635 case -NFS4ERR_RECALLCONFLICT: 9636 status = -ERECALLCONFLICT; 9637 break; 9638 case -NFS4ERR_DELEG_REVOKED: 9639 case -NFS4ERR_ADMIN_REVOKED: 9640 case -NFS4ERR_EXPIRED: 9641 case -NFS4ERR_BAD_STATEID: 9642 exception->timeout = 0; 9643 spin_lock(&inode->i_lock); 9644 /* If the open stateid was bad, then recover it. */ 9645 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9646 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9647 spin_unlock(&inode->i_lock); 9648 exception->state = lgp->args.ctx->state; 9649 exception->stateid = &lgp->args.stateid; 9650 break; 9651 } 9652 9653 /* 9654 * Mark the bad layout state as invalid, then retry 9655 */ 9656 pnfs_mark_layout_stateid_invalid(lo, &head); 9657 spin_unlock(&inode->i_lock); 9658 nfs_commit_inode(inode, 0); 9659 pnfs_free_lseg_list(&head); 9660 status = -EAGAIN; 9661 goto out; 9662 } 9663 9664 err = nfs4_handle_exception(server, nfs4err, exception); 9665 if (!status) { 9666 if (exception->retry) 9667 status = -EAGAIN; 9668 else 9669 status = err; 9670 } 9671 out: 9672 return status; 9673 } 9674 9675 size_t max_response_pages(struct nfs_server *server) 9676 { 9677 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9678 return nfs_page_array_len(0, max_resp_sz); 9679 } 9680 9681 static void nfs4_layoutget_release(void *calldata) 9682 { 9683 struct nfs4_layoutget *lgp = calldata; 9684 9685 nfs4_sequence_free_slot(&lgp->res.seq_res); 9686 pnfs_layoutget_free(lgp); 9687 } 9688 9689 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9690 .rpc_call_prepare = nfs4_layoutget_prepare, 9691 .rpc_call_done = nfs4_layoutget_done, 9692 .rpc_release = nfs4_layoutget_release, 9693 }; 9694 9695 struct pnfs_layout_segment * 9696 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9697 { 9698 struct inode *inode = lgp->args.inode; 9699 struct nfs_server *server = NFS_SERVER(inode); 9700 struct rpc_task *task; 9701 struct rpc_message msg = { 9702 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9703 .rpc_argp = &lgp->args, 9704 .rpc_resp = &lgp->res, 9705 .rpc_cred = lgp->cred, 9706 }; 9707 struct rpc_task_setup task_setup_data = { 9708 .rpc_client = server->client, 9709 .rpc_message = &msg, 9710 .callback_ops = &nfs4_layoutget_call_ops, 9711 .callback_data = lgp, 9712 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9713 RPC_TASK_MOVEABLE, 9714 }; 9715 struct pnfs_layout_segment *lseg = NULL; 9716 struct nfs4_exception exception = { 9717 .inode = inode, 9718 .timeout = *timeout, 9719 }; 9720 int status = 0; 9721 9722 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9723 9724 task = rpc_run_task(&task_setup_data); 9725 if (IS_ERR(task)) 9726 return ERR_CAST(task); 9727 9728 status = rpc_wait_for_completion_task(task); 9729 if (status != 0) 9730 goto out; 9731 9732 if (task->tk_status < 0) { 9733 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9734 *timeout = exception.timeout; 9735 } else if (lgp->res.layoutp->len == 0) { 9736 status = -EAGAIN; 9737 *timeout = nfs4_update_delay(&exception.timeout); 9738 } else 9739 lseg = pnfs_layout_process(lgp); 9740 out: 9741 trace_nfs4_layoutget(lgp->args.ctx, 9742 &lgp->args.range, 9743 &lgp->res.range, 9744 &lgp->res.stateid, 9745 status); 9746 9747 rpc_put_task(task); 9748 dprintk("<-- %s status=%d\n", __func__, status); 9749 if (status) 9750 return ERR_PTR(status); 9751 return lseg; 9752 } 9753 9754 static void 9755 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9756 { 9757 struct nfs4_layoutreturn *lrp = calldata; 9758 9759 nfs4_setup_sequence(lrp->clp, 9760 &lrp->args.seq_args, 9761 &lrp->res.seq_res, 9762 task); 9763 if (!pnfs_layout_is_valid(lrp->args.layout)) 9764 rpc_exit(task, 0); 9765 } 9766 9767 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9768 { 9769 struct nfs4_layoutreturn *lrp = calldata; 9770 struct nfs_server *server; 9771 9772 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9773 return; 9774 9775 /* 9776 * Was there an RPC level error? Assume the call succeeded, 9777 * and that we need to release the layout 9778 */ 9779 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9780 lrp->res.lrs_present = 0; 9781 return; 9782 } 9783 9784 server = NFS_SERVER(lrp->args.inode); 9785 switch (task->tk_status) { 9786 case -NFS4ERR_OLD_STATEID: 9787 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9788 &lrp->args.range, 9789 lrp->args.inode)) 9790 goto out_restart; 9791 fallthrough; 9792 default: 9793 task->tk_status = 0; 9794 fallthrough; 9795 case 0: 9796 break; 9797 case -NFS4ERR_DELAY: 9798 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9799 break; 9800 goto out_restart; 9801 } 9802 return; 9803 out_restart: 9804 task->tk_status = 0; 9805 nfs4_sequence_free_slot(&lrp->res.seq_res); 9806 rpc_restart_call_prepare(task); 9807 } 9808 9809 static void nfs4_layoutreturn_release(void *calldata) 9810 { 9811 struct nfs4_layoutreturn *lrp = calldata; 9812 struct pnfs_layout_hdr *lo = lrp->args.layout; 9813 9814 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9815 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9816 nfs4_sequence_free_slot(&lrp->res.seq_res); 9817 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9818 lrp->ld_private.ops->free(&lrp->ld_private); 9819 pnfs_put_layout_hdr(lrp->args.layout); 9820 nfs_iput_and_deactive(lrp->inode); 9821 put_cred(lrp->cred); 9822 kfree(calldata); 9823 } 9824 9825 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9826 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9827 .rpc_call_done = nfs4_layoutreturn_done, 9828 .rpc_release = nfs4_layoutreturn_release, 9829 }; 9830 9831 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9832 { 9833 struct rpc_task *task; 9834 struct rpc_message msg = { 9835 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9836 .rpc_argp = &lrp->args, 9837 .rpc_resp = &lrp->res, 9838 .rpc_cred = lrp->cred, 9839 }; 9840 struct rpc_task_setup task_setup_data = { 9841 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9842 .rpc_message = &msg, 9843 .callback_ops = &nfs4_layoutreturn_call_ops, 9844 .callback_data = lrp, 9845 .flags = RPC_TASK_MOVEABLE, 9846 }; 9847 int status = 0; 9848 9849 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9850 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9851 &task_setup_data.rpc_client, &msg); 9852 9853 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9854 if (!sync) { 9855 if (!lrp->inode) { 9856 nfs4_layoutreturn_release(lrp); 9857 return -EAGAIN; 9858 } 9859 task_setup_data.flags |= RPC_TASK_ASYNC; 9860 } 9861 if (!lrp->inode) 9862 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9863 1); 9864 else 9865 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9866 0); 9867 task = rpc_run_task(&task_setup_data); 9868 if (IS_ERR(task)) 9869 return PTR_ERR(task); 9870 if (sync) 9871 status = task->tk_status; 9872 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9873 dprintk("<-- %s status=%d\n", __func__, status); 9874 rpc_put_task(task); 9875 return status; 9876 } 9877 9878 static int 9879 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9880 struct pnfs_device *pdev, 9881 const struct cred *cred) 9882 { 9883 struct nfs4_getdeviceinfo_args args = { 9884 .pdev = pdev, 9885 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9886 NOTIFY_DEVICEID4_DELETE, 9887 }; 9888 struct nfs4_getdeviceinfo_res res = { 9889 .pdev = pdev, 9890 }; 9891 struct rpc_message msg = { 9892 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9893 .rpc_argp = &args, 9894 .rpc_resp = &res, 9895 .rpc_cred = cred, 9896 }; 9897 int status; 9898 9899 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9900 if (res.notification & ~args.notify_types) 9901 dprintk("%s: unsupported notification\n", __func__); 9902 if (res.notification != args.notify_types) 9903 pdev->nocache = 1; 9904 9905 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9906 9907 dprintk("<-- %s status=%d\n", __func__, status); 9908 9909 return status; 9910 } 9911 9912 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9913 struct pnfs_device *pdev, 9914 const struct cred *cred) 9915 { 9916 struct nfs4_exception exception = { }; 9917 int err; 9918 9919 do { 9920 err = nfs4_handle_exception(server, 9921 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9922 &exception); 9923 } while (exception.retry); 9924 return err; 9925 } 9926 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9927 9928 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9929 { 9930 struct nfs4_layoutcommit_data *data = calldata; 9931 struct nfs_server *server = NFS_SERVER(data->args.inode); 9932 9933 nfs4_setup_sequence(server->nfs_client, 9934 &data->args.seq_args, 9935 &data->res.seq_res, 9936 task); 9937 } 9938 9939 static void 9940 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9941 { 9942 struct nfs4_layoutcommit_data *data = calldata; 9943 struct nfs_server *server = NFS_SERVER(data->args.inode); 9944 9945 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9946 return; 9947 9948 switch (task->tk_status) { /* Just ignore these failures */ 9949 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9950 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9951 case -NFS4ERR_BADLAYOUT: /* no layout */ 9952 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9953 task->tk_status = 0; 9954 break; 9955 case 0: 9956 break; 9957 default: 9958 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9959 rpc_restart_call_prepare(task); 9960 return; 9961 } 9962 } 9963 } 9964 9965 static void nfs4_layoutcommit_release(void *calldata) 9966 { 9967 struct nfs4_layoutcommit_data *data = calldata; 9968 9969 pnfs_cleanup_layoutcommit(data); 9970 nfs_post_op_update_inode_force_wcc(data->args.inode, 9971 data->res.fattr); 9972 put_cred(data->cred); 9973 nfs_iput_and_deactive(data->inode); 9974 kfree(data); 9975 } 9976 9977 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9978 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9979 .rpc_call_done = nfs4_layoutcommit_done, 9980 .rpc_release = nfs4_layoutcommit_release, 9981 }; 9982 9983 int 9984 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9985 { 9986 struct rpc_message msg = { 9987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9988 .rpc_argp = &data->args, 9989 .rpc_resp = &data->res, 9990 .rpc_cred = data->cred, 9991 }; 9992 struct rpc_task_setup task_setup_data = { 9993 .task = &data->task, 9994 .rpc_client = NFS_CLIENT(data->args.inode), 9995 .rpc_message = &msg, 9996 .callback_ops = &nfs4_layoutcommit_ops, 9997 .callback_data = data, 9998 .flags = RPC_TASK_MOVEABLE, 9999 }; 10000 struct rpc_task *task; 10001 int status = 0; 10002 10003 dprintk("NFS: initiating layoutcommit call. sync %d " 10004 "lbw: %llu inode %lu\n", sync, 10005 data->args.lastbytewritten, 10006 data->args.inode->i_ino); 10007 10008 if (!sync) { 10009 data->inode = nfs_igrab_and_active(data->args.inode); 10010 if (data->inode == NULL) { 10011 nfs4_layoutcommit_release(data); 10012 return -EAGAIN; 10013 } 10014 task_setup_data.flags = RPC_TASK_ASYNC; 10015 } 10016 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10017 task = rpc_run_task(&task_setup_data); 10018 if (IS_ERR(task)) 10019 return PTR_ERR(task); 10020 if (sync) 10021 status = task->tk_status; 10022 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10023 dprintk("%s: status %d\n", __func__, status); 10024 rpc_put_task(task); 10025 return status; 10026 } 10027 10028 /* 10029 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10030 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10031 */ 10032 static int 10033 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10034 struct nfs_fsinfo *info, 10035 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10036 { 10037 struct nfs41_secinfo_no_name_args args = { 10038 .style = SECINFO_STYLE_CURRENT_FH, 10039 }; 10040 struct nfs4_secinfo_res res = { 10041 .flavors = flavors, 10042 }; 10043 struct rpc_message msg = { 10044 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10045 .rpc_argp = &args, 10046 .rpc_resp = &res, 10047 }; 10048 struct nfs4_call_sync_data data = { 10049 .seq_server = server, 10050 .seq_args = &args.seq_args, 10051 .seq_res = &res.seq_res, 10052 }; 10053 struct rpc_task_setup task_setup = { 10054 .rpc_client = server->client, 10055 .rpc_message = &msg, 10056 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10057 .callback_data = &data, 10058 .flags = RPC_TASK_NO_ROUND_ROBIN, 10059 }; 10060 const struct cred *cred = NULL; 10061 int status; 10062 10063 if (use_integrity) { 10064 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10065 10066 cred = nfs4_get_clid_cred(server->nfs_client); 10067 msg.rpc_cred = cred; 10068 } 10069 10070 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10071 status = nfs4_call_sync_custom(&task_setup); 10072 dprintk("<-- %s status=%d\n", __func__, status); 10073 10074 put_cred(cred); 10075 10076 return status; 10077 } 10078 10079 static int 10080 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10081 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10082 { 10083 struct nfs4_exception exception = { 10084 .interruptible = true, 10085 }; 10086 int err; 10087 do { 10088 /* first try using integrity protection */ 10089 err = -NFS4ERR_WRONGSEC; 10090 10091 /* try to use integrity protection with machine cred */ 10092 if (_nfs4_is_integrity_protected(server->nfs_client)) 10093 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10094 flavors, true); 10095 10096 /* 10097 * if unable to use integrity protection, or SECINFO with 10098 * integrity protection returns NFS4ERR_WRONGSEC (which is 10099 * disallowed by spec, but exists in deployed servers) use 10100 * the current filesystem's rpc_client and the user cred. 10101 */ 10102 if (err == -NFS4ERR_WRONGSEC) 10103 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10104 flavors, false); 10105 10106 switch (err) { 10107 case 0: 10108 case -NFS4ERR_WRONGSEC: 10109 case -ENOTSUPP: 10110 goto out; 10111 default: 10112 err = nfs4_handle_exception(server, err, &exception); 10113 } 10114 } while (exception.retry); 10115 out: 10116 return err; 10117 } 10118 10119 static int 10120 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10121 struct nfs_fsinfo *info) 10122 { 10123 int err; 10124 struct page *page; 10125 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10126 struct nfs4_secinfo_flavors *flavors; 10127 struct nfs4_secinfo4 *secinfo; 10128 int i; 10129 10130 page = alloc_page(GFP_KERNEL); 10131 if (!page) { 10132 err = -ENOMEM; 10133 goto out; 10134 } 10135 10136 flavors = page_address(page); 10137 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10138 10139 /* 10140 * Fall back on "guess and check" method if 10141 * the server doesn't support SECINFO_NO_NAME 10142 */ 10143 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10144 err = nfs4_find_root_sec(server, fhandle, info); 10145 goto out_freepage; 10146 } 10147 if (err) 10148 goto out_freepage; 10149 10150 for (i = 0; i < flavors->num_flavors; i++) { 10151 secinfo = &flavors->flavors[i]; 10152 10153 switch (secinfo->flavor) { 10154 case RPC_AUTH_NULL: 10155 case RPC_AUTH_UNIX: 10156 case RPC_AUTH_GSS: 10157 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10158 &secinfo->flavor_info); 10159 break; 10160 default: 10161 flavor = RPC_AUTH_MAXFLAVOR; 10162 break; 10163 } 10164 10165 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10166 flavor = RPC_AUTH_MAXFLAVOR; 10167 10168 if (flavor != RPC_AUTH_MAXFLAVOR) { 10169 err = nfs4_lookup_root_sec(server, fhandle, 10170 info, flavor); 10171 if (!err) 10172 break; 10173 } 10174 } 10175 10176 if (flavor == RPC_AUTH_MAXFLAVOR) 10177 err = -EPERM; 10178 10179 out_freepage: 10180 put_page(page); 10181 if (err == -EACCES) 10182 return -EPERM; 10183 out: 10184 return err; 10185 } 10186 10187 static int _nfs41_test_stateid(struct nfs_server *server, 10188 nfs4_stateid *stateid, 10189 const struct cred *cred) 10190 { 10191 int status; 10192 struct nfs41_test_stateid_args args = { 10193 .stateid = stateid, 10194 }; 10195 struct nfs41_test_stateid_res res; 10196 struct rpc_message msg = { 10197 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10198 .rpc_argp = &args, 10199 .rpc_resp = &res, 10200 .rpc_cred = cred, 10201 }; 10202 struct rpc_clnt *rpc_client = server->client; 10203 10204 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10205 &rpc_client, &msg); 10206 10207 dprintk("NFS call test_stateid %p\n", stateid); 10208 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10209 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10210 &args.seq_args, &res.seq_res); 10211 if (status != NFS_OK) { 10212 dprintk("NFS reply test_stateid: failed, %d\n", status); 10213 return status; 10214 } 10215 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10216 return -res.status; 10217 } 10218 10219 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10220 int err, struct nfs4_exception *exception) 10221 { 10222 exception->retry = 0; 10223 switch(err) { 10224 case -NFS4ERR_DELAY: 10225 case -NFS4ERR_RETRY_UNCACHED_REP: 10226 nfs4_handle_exception(server, err, exception); 10227 break; 10228 case -NFS4ERR_BADSESSION: 10229 case -NFS4ERR_BADSLOT: 10230 case -NFS4ERR_BAD_HIGH_SLOT: 10231 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10232 case -NFS4ERR_DEADSESSION: 10233 nfs4_do_handle_exception(server, err, exception); 10234 } 10235 } 10236 10237 /** 10238 * nfs41_test_stateid - perform a TEST_STATEID operation 10239 * 10240 * @server: server / transport on which to perform the operation 10241 * @stateid: state ID to test 10242 * @cred: credential 10243 * 10244 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10245 * Otherwise a negative NFS4ERR value is returned if the operation 10246 * failed or the state ID is not currently valid. 10247 */ 10248 static int nfs41_test_stateid(struct nfs_server *server, 10249 nfs4_stateid *stateid, 10250 const struct cred *cred) 10251 { 10252 struct nfs4_exception exception = { 10253 .interruptible = true, 10254 }; 10255 int err; 10256 do { 10257 err = _nfs41_test_stateid(server, stateid, cred); 10258 nfs4_handle_delay_or_session_error(server, err, &exception); 10259 } while (exception.retry); 10260 return err; 10261 } 10262 10263 struct nfs_free_stateid_data { 10264 struct nfs_server *server; 10265 struct nfs41_free_stateid_args args; 10266 struct nfs41_free_stateid_res res; 10267 }; 10268 10269 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10270 { 10271 struct nfs_free_stateid_data *data = calldata; 10272 nfs4_setup_sequence(data->server->nfs_client, 10273 &data->args.seq_args, 10274 &data->res.seq_res, 10275 task); 10276 } 10277 10278 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10279 { 10280 struct nfs_free_stateid_data *data = calldata; 10281 10282 nfs41_sequence_done(task, &data->res.seq_res); 10283 10284 switch (task->tk_status) { 10285 case -NFS4ERR_DELAY: 10286 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10287 rpc_restart_call_prepare(task); 10288 } 10289 } 10290 10291 static void nfs41_free_stateid_release(void *calldata) 10292 { 10293 struct nfs_free_stateid_data *data = calldata; 10294 struct nfs_client *clp = data->server->nfs_client; 10295 10296 nfs_put_client(clp); 10297 kfree(calldata); 10298 } 10299 10300 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10301 .rpc_call_prepare = nfs41_free_stateid_prepare, 10302 .rpc_call_done = nfs41_free_stateid_done, 10303 .rpc_release = nfs41_free_stateid_release, 10304 }; 10305 10306 /** 10307 * nfs41_free_stateid - perform a FREE_STATEID operation 10308 * 10309 * @server: server / transport on which to perform the operation 10310 * @stateid: state ID to release 10311 * @cred: credential 10312 * @privileged: set to true if this call needs to be privileged 10313 * 10314 * Note: this function is always asynchronous. 10315 */ 10316 static int nfs41_free_stateid(struct nfs_server *server, 10317 const nfs4_stateid *stateid, 10318 const struct cred *cred, 10319 bool privileged) 10320 { 10321 struct rpc_message msg = { 10322 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10323 .rpc_cred = cred, 10324 }; 10325 struct rpc_task_setup task_setup = { 10326 .rpc_client = server->client, 10327 .rpc_message = &msg, 10328 .callback_ops = &nfs41_free_stateid_ops, 10329 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10330 }; 10331 struct nfs_free_stateid_data *data; 10332 struct rpc_task *task; 10333 struct nfs_client *clp = server->nfs_client; 10334 10335 if (!refcount_inc_not_zero(&clp->cl_count)) 10336 return -EIO; 10337 10338 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10339 &task_setup.rpc_client, &msg); 10340 10341 dprintk("NFS call free_stateid %p\n", stateid); 10342 data = kmalloc(sizeof(*data), GFP_KERNEL); 10343 if (!data) 10344 return -ENOMEM; 10345 data->server = server; 10346 nfs4_stateid_copy(&data->args.stateid, stateid); 10347 10348 task_setup.callback_data = data; 10349 10350 msg.rpc_argp = &data->args; 10351 msg.rpc_resp = &data->res; 10352 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10353 task = rpc_run_task(&task_setup); 10354 if (IS_ERR(task)) 10355 return PTR_ERR(task); 10356 rpc_put_task(task); 10357 return 0; 10358 } 10359 10360 static void 10361 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10362 { 10363 const struct cred *cred = lsp->ls_state->owner->so_cred; 10364 10365 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10366 nfs4_free_lock_state(server, lsp); 10367 } 10368 10369 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10370 const nfs4_stateid *s2) 10371 { 10372 if (s1->type != s2->type) 10373 return false; 10374 10375 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10376 return false; 10377 10378 if (s1->seqid == s2->seqid) 10379 return true; 10380 10381 return s1->seqid == 0 || s2->seqid == 0; 10382 } 10383 10384 #endif /* CONFIG_NFS_V4_1 */ 10385 10386 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10387 const nfs4_stateid *s2) 10388 { 10389 return nfs4_stateid_match(s1, s2); 10390 } 10391 10392 10393 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10394 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10395 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10396 .recover_open = nfs4_open_reclaim, 10397 .recover_lock = nfs4_lock_reclaim, 10398 .establish_clid = nfs4_init_clientid, 10399 .detect_trunking = nfs40_discover_server_trunking, 10400 }; 10401 10402 #if defined(CONFIG_NFS_V4_1) 10403 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10404 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10405 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10406 .recover_open = nfs4_open_reclaim, 10407 .recover_lock = nfs4_lock_reclaim, 10408 .establish_clid = nfs41_init_clientid, 10409 .reclaim_complete = nfs41_proc_reclaim_complete, 10410 .detect_trunking = nfs41_discover_server_trunking, 10411 }; 10412 #endif /* CONFIG_NFS_V4_1 */ 10413 10414 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10415 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10416 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10417 .recover_open = nfs40_open_expired, 10418 .recover_lock = nfs4_lock_expired, 10419 .establish_clid = nfs4_init_clientid, 10420 }; 10421 10422 #if defined(CONFIG_NFS_V4_1) 10423 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10424 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10425 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10426 .recover_open = nfs41_open_expired, 10427 .recover_lock = nfs41_lock_expired, 10428 .establish_clid = nfs41_init_clientid, 10429 }; 10430 #endif /* CONFIG_NFS_V4_1 */ 10431 10432 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10433 .sched_state_renewal = nfs4_proc_async_renew, 10434 .get_state_renewal_cred = nfs4_get_renew_cred, 10435 .renew_lease = nfs4_proc_renew, 10436 }; 10437 10438 #if defined(CONFIG_NFS_V4_1) 10439 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10440 .sched_state_renewal = nfs41_proc_async_sequence, 10441 .get_state_renewal_cred = nfs4_get_machine_cred, 10442 .renew_lease = nfs4_proc_sequence, 10443 }; 10444 #endif 10445 10446 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10447 .get_locations = _nfs40_proc_get_locations, 10448 .fsid_present = _nfs40_proc_fsid_present, 10449 }; 10450 10451 #if defined(CONFIG_NFS_V4_1) 10452 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10453 .get_locations = _nfs41_proc_get_locations, 10454 .fsid_present = _nfs41_proc_fsid_present, 10455 }; 10456 #endif /* CONFIG_NFS_V4_1 */ 10457 10458 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10459 .minor_version = 0, 10460 .init_caps = NFS_CAP_READDIRPLUS 10461 | NFS_CAP_ATOMIC_OPEN 10462 | NFS_CAP_POSIX_LOCK, 10463 .init_client = nfs40_init_client, 10464 .shutdown_client = nfs40_shutdown_client, 10465 .match_stateid = nfs4_match_stateid, 10466 .find_root_sec = nfs4_find_root_sec, 10467 .free_lock_state = nfs4_release_lockowner, 10468 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10469 .alloc_seqid = nfs_alloc_seqid, 10470 .call_sync_ops = &nfs40_call_sync_ops, 10471 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10472 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10473 .state_renewal_ops = &nfs40_state_renewal_ops, 10474 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10475 }; 10476 10477 #if defined(CONFIG_NFS_V4_1) 10478 static struct nfs_seqid * 10479 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10480 { 10481 return NULL; 10482 } 10483 10484 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10485 .minor_version = 1, 10486 .init_caps = NFS_CAP_READDIRPLUS 10487 | NFS_CAP_ATOMIC_OPEN 10488 | NFS_CAP_POSIX_LOCK 10489 | NFS_CAP_STATEID_NFSV41 10490 | NFS_CAP_ATOMIC_OPEN_V1 10491 | NFS_CAP_LGOPEN 10492 | NFS_CAP_MOVEABLE, 10493 .init_client = nfs41_init_client, 10494 .shutdown_client = nfs41_shutdown_client, 10495 .match_stateid = nfs41_match_stateid, 10496 .find_root_sec = nfs41_find_root_sec, 10497 .free_lock_state = nfs41_free_lock_state, 10498 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10499 .alloc_seqid = nfs_alloc_no_seqid, 10500 .session_trunk = nfs4_test_session_trunk, 10501 .call_sync_ops = &nfs41_call_sync_ops, 10502 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10503 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10504 .state_renewal_ops = &nfs41_state_renewal_ops, 10505 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10506 }; 10507 #endif 10508 10509 #if defined(CONFIG_NFS_V4_2) 10510 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10511 .minor_version = 2, 10512 .init_caps = NFS_CAP_READDIRPLUS 10513 | NFS_CAP_ATOMIC_OPEN 10514 | NFS_CAP_POSIX_LOCK 10515 | NFS_CAP_STATEID_NFSV41 10516 | NFS_CAP_ATOMIC_OPEN_V1 10517 | NFS_CAP_LGOPEN 10518 | NFS_CAP_ALLOCATE 10519 | NFS_CAP_COPY 10520 | NFS_CAP_OFFLOAD_CANCEL 10521 | NFS_CAP_COPY_NOTIFY 10522 | NFS_CAP_DEALLOCATE 10523 | NFS_CAP_SEEK 10524 | NFS_CAP_LAYOUTSTATS 10525 | NFS_CAP_CLONE 10526 | NFS_CAP_LAYOUTERROR 10527 | NFS_CAP_READ_PLUS 10528 | NFS_CAP_MOVEABLE, 10529 .init_client = nfs41_init_client, 10530 .shutdown_client = nfs41_shutdown_client, 10531 .match_stateid = nfs41_match_stateid, 10532 .find_root_sec = nfs41_find_root_sec, 10533 .free_lock_state = nfs41_free_lock_state, 10534 .call_sync_ops = &nfs41_call_sync_ops, 10535 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10536 .alloc_seqid = nfs_alloc_no_seqid, 10537 .session_trunk = nfs4_test_session_trunk, 10538 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10539 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10540 .state_renewal_ops = &nfs41_state_renewal_ops, 10541 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10542 }; 10543 #endif 10544 10545 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10546 [0] = &nfs_v4_0_minor_ops, 10547 #if defined(CONFIG_NFS_V4_1) 10548 [1] = &nfs_v4_1_minor_ops, 10549 #endif 10550 #if defined(CONFIG_NFS_V4_2) 10551 [2] = &nfs_v4_2_minor_ops, 10552 #endif 10553 }; 10554 10555 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10556 { 10557 ssize_t error, error2, error3; 10558 10559 error = generic_listxattr(dentry, list, size); 10560 if (error < 0) 10561 return error; 10562 if (list) { 10563 list += error; 10564 size -= error; 10565 } 10566 10567 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10568 if (error2 < 0) 10569 return error2; 10570 10571 if (list) { 10572 list += error2; 10573 size -= error2; 10574 } 10575 10576 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10577 if (error3 < 0) 10578 return error3; 10579 10580 return error + error2 + error3; 10581 } 10582 10583 static void nfs4_enable_swap(struct inode *inode) 10584 { 10585 /* The state manager thread must always be running. 10586 * It will notice the client is a swapper, and stay put. 10587 */ 10588 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10589 10590 nfs4_schedule_state_manager(clp); 10591 } 10592 10593 static void nfs4_disable_swap(struct inode *inode) 10594 { 10595 /* The state manager thread will now exit once it is 10596 * woken. 10597 */ 10598 wake_up_var(&NFS_SERVER(inode)->nfs_client->cl_state); 10599 } 10600 10601 static const struct inode_operations nfs4_dir_inode_operations = { 10602 .create = nfs_create, 10603 .lookup = nfs_lookup, 10604 .atomic_open = nfs_atomic_open, 10605 .link = nfs_link, 10606 .unlink = nfs_unlink, 10607 .symlink = nfs_symlink, 10608 .mkdir = nfs_mkdir, 10609 .rmdir = nfs_rmdir, 10610 .mknod = nfs_mknod, 10611 .rename = nfs_rename, 10612 .permission = nfs_permission, 10613 .getattr = nfs_getattr, 10614 .setattr = nfs_setattr, 10615 .listxattr = nfs4_listxattr, 10616 }; 10617 10618 static const struct inode_operations nfs4_file_inode_operations = { 10619 .permission = nfs_permission, 10620 .getattr = nfs_getattr, 10621 .setattr = nfs_setattr, 10622 .listxattr = nfs4_listxattr, 10623 }; 10624 10625 const struct nfs_rpc_ops nfs_v4_clientops = { 10626 .version = 4, /* protocol version */ 10627 .dentry_ops = &nfs4_dentry_operations, 10628 .dir_inode_ops = &nfs4_dir_inode_operations, 10629 .file_inode_ops = &nfs4_file_inode_operations, 10630 .file_ops = &nfs4_file_operations, 10631 .getroot = nfs4_proc_get_root, 10632 .submount = nfs4_submount, 10633 .try_get_tree = nfs4_try_get_tree, 10634 .getattr = nfs4_proc_getattr, 10635 .setattr = nfs4_proc_setattr, 10636 .lookup = nfs4_proc_lookup, 10637 .lookupp = nfs4_proc_lookupp, 10638 .access = nfs4_proc_access, 10639 .readlink = nfs4_proc_readlink, 10640 .create = nfs4_proc_create, 10641 .remove = nfs4_proc_remove, 10642 .unlink_setup = nfs4_proc_unlink_setup, 10643 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10644 .unlink_done = nfs4_proc_unlink_done, 10645 .rename_setup = nfs4_proc_rename_setup, 10646 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10647 .rename_done = nfs4_proc_rename_done, 10648 .link = nfs4_proc_link, 10649 .symlink = nfs4_proc_symlink, 10650 .mkdir = nfs4_proc_mkdir, 10651 .rmdir = nfs4_proc_rmdir, 10652 .readdir = nfs4_proc_readdir, 10653 .mknod = nfs4_proc_mknod, 10654 .statfs = nfs4_proc_statfs, 10655 .fsinfo = nfs4_proc_fsinfo, 10656 .pathconf = nfs4_proc_pathconf, 10657 .set_capabilities = nfs4_server_capabilities, 10658 .decode_dirent = nfs4_decode_dirent, 10659 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10660 .read_setup = nfs4_proc_read_setup, 10661 .read_done = nfs4_read_done, 10662 .write_setup = nfs4_proc_write_setup, 10663 .write_done = nfs4_write_done, 10664 .commit_setup = nfs4_proc_commit_setup, 10665 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10666 .commit_done = nfs4_commit_done, 10667 .lock = nfs4_proc_lock, 10668 .clear_acl_cache = nfs4_zap_acl_attr, 10669 .close_context = nfs4_close_context, 10670 .open_context = nfs4_atomic_open, 10671 .have_delegation = nfs4_have_delegation, 10672 .alloc_client = nfs4_alloc_client, 10673 .init_client = nfs4_init_client, 10674 .free_client = nfs4_free_client, 10675 .create_server = nfs4_create_server, 10676 .clone_server = nfs_clone_server, 10677 .discover_trunking = nfs4_discover_trunking, 10678 .enable_swap = nfs4_enable_swap, 10679 .disable_swap = nfs4_disable_swap, 10680 }; 10681 10682 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10683 .name = XATTR_NAME_NFSV4_ACL, 10684 .list = nfs4_xattr_list_nfs4_acl, 10685 .get = nfs4_xattr_get_nfs4_acl, 10686 .set = nfs4_xattr_set_nfs4_acl, 10687 }; 10688 10689 #if defined(CONFIG_NFS_V4_1) 10690 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10691 .name = XATTR_NAME_NFSV4_DACL, 10692 .list = nfs4_xattr_list_nfs4_dacl, 10693 .get = nfs4_xattr_get_nfs4_dacl, 10694 .set = nfs4_xattr_set_nfs4_dacl, 10695 }; 10696 10697 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10698 .name = XATTR_NAME_NFSV4_SACL, 10699 .list = nfs4_xattr_list_nfs4_sacl, 10700 .get = nfs4_xattr_get_nfs4_sacl, 10701 .set = nfs4_xattr_set_nfs4_sacl, 10702 }; 10703 #endif 10704 10705 #ifdef CONFIG_NFS_V4_2 10706 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10707 .prefix = XATTR_USER_PREFIX, 10708 .get = nfs4_xattr_get_nfs4_user, 10709 .set = nfs4_xattr_set_nfs4_user, 10710 }; 10711 #endif 10712 10713 const struct xattr_handler *nfs4_xattr_handlers[] = { 10714 &nfs4_xattr_nfs4_acl_handler, 10715 #if defined(CONFIG_NFS_V4_1) 10716 &nfs4_xattr_nfs4_dacl_handler, 10717 &nfs4_xattr_nfs4_sacl_handler, 10718 #endif 10719 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10720 &nfs4_xattr_nfs4_label_handler, 10721 #endif 10722 #ifdef CONFIG_NFS_V4_2 10723 &nfs4_xattr_nfs4_user_handler, 10724 #endif 10725 NULL 10726 }; 10727