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