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 label->lfs = 0; 126 label->pi = 0; 127 label->len = 0; 128 label->label = NULL; 129 130 err = security_dentry_init_security(dentry, sattr->ia_mode, 131 &dentry->d_name, NULL, 132 (void **)&label->label, &label->len); 133 if (err == 0) 134 return label; 135 136 return NULL; 137 } 138 static inline void 139 nfs4_label_release_security(struct nfs4_label *label) 140 { 141 if (label) 142 security_release_secctx(label->label, label->len); 143 } 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 145 { 146 if (label) 147 return server->attr_bitmask; 148 149 return server->attr_bitmask_nl; 150 } 151 #else 152 static inline struct nfs4_label * 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 154 struct iattr *sattr, struct nfs4_label *l) 155 { return NULL; } 156 static inline void 157 nfs4_label_release_security(struct nfs4_label *label) 158 { return; } 159 static inline u32 * 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 161 { return server->attr_bitmask; } 162 #endif 163 164 /* Prevent leaks of NFSv4 errors into userland */ 165 static int nfs4_map_errors(int err) 166 { 167 if (err >= -1000) 168 return err; 169 switch (err) { 170 case -NFS4ERR_RESOURCE: 171 case -NFS4ERR_LAYOUTTRYLATER: 172 case -NFS4ERR_RECALLCONFLICT: 173 return -EREMOTEIO; 174 case -NFS4ERR_WRONGSEC: 175 case -NFS4ERR_WRONG_CRED: 176 return -EPERM; 177 case -NFS4ERR_BADOWNER: 178 case -NFS4ERR_BADNAME: 179 return -EINVAL; 180 case -NFS4ERR_SHARE_DENIED: 181 return -EACCES; 182 case -NFS4ERR_MINOR_VERS_MISMATCH: 183 return -EPROTONOSUPPORT; 184 case -NFS4ERR_FILE_OPEN: 185 return -EBUSY; 186 case -NFS4ERR_NOT_SAME: 187 return -ENOTSYNC; 188 default: 189 dprintk("%s could not handle NFSv4 error %d\n", 190 __func__, -err); 191 break; 192 } 193 return -EIO; 194 } 195 196 /* 197 * This is our standard bitmap for GETATTR requests. 198 */ 199 const u32 nfs4_fattr_bitmap[3] = { 200 FATTR4_WORD0_TYPE 201 | FATTR4_WORD0_CHANGE 202 | FATTR4_WORD0_SIZE 203 | FATTR4_WORD0_FSID 204 | FATTR4_WORD0_FILEID, 205 FATTR4_WORD1_MODE 206 | FATTR4_WORD1_NUMLINKS 207 | FATTR4_WORD1_OWNER 208 | FATTR4_WORD1_OWNER_GROUP 209 | FATTR4_WORD1_RAWDEV 210 | FATTR4_WORD1_SPACE_USED 211 | FATTR4_WORD1_TIME_ACCESS 212 | FATTR4_WORD1_TIME_METADATA 213 | FATTR4_WORD1_TIME_MODIFY 214 | FATTR4_WORD1_MOUNTED_ON_FILEID, 215 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 216 FATTR4_WORD2_SECURITY_LABEL 217 #endif 218 }; 219 220 static const u32 nfs4_pnfs_open_bitmap[3] = { 221 FATTR4_WORD0_TYPE 222 | FATTR4_WORD0_CHANGE 223 | FATTR4_WORD0_SIZE 224 | FATTR4_WORD0_FSID 225 | FATTR4_WORD0_FILEID, 226 FATTR4_WORD1_MODE 227 | FATTR4_WORD1_NUMLINKS 228 | FATTR4_WORD1_OWNER 229 | FATTR4_WORD1_OWNER_GROUP 230 | FATTR4_WORD1_RAWDEV 231 | FATTR4_WORD1_SPACE_USED 232 | FATTR4_WORD1_TIME_ACCESS 233 | FATTR4_WORD1_TIME_METADATA 234 | FATTR4_WORD1_TIME_MODIFY, 235 FATTR4_WORD2_MDSTHRESHOLD 236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 237 | FATTR4_WORD2_SECURITY_LABEL 238 #endif 239 }; 240 241 static const u32 nfs4_open_noattr_bitmap[3] = { 242 FATTR4_WORD0_TYPE 243 | FATTR4_WORD0_FILEID, 244 }; 245 246 const u32 nfs4_statfs_bitmap[3] = { 247 FATTR4_WORD0_FILES_AVAIL 248 | FATTR4_WORD0_FILES_FREE 249 | FATTR4_WORD0_FILES_TOTAL, 250 FATTR4_WORD1_SPACE_AVAIL 251 | FATTR4_WORD1_SPACE_FREE 252 | FATTR4_WORD1_SPACE_TOTAL 253 }; 254 255 const u32 nfs4_pathconf_bitmap[3] = { 256 FATTR4_WORD0_MAXLINK 257 | FATTR4_WORD0_MAXNAME, 258 0 259 }; 260 261 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 262 | FATTR4_WORD0_MAXREAD 263 | FATTR4_WORD0_MAXWRITE 264 | FATTR4_WORD0_LEASE_TIME, 265 FATTR4_WORD1_TIME_DELTA 266 | FATTR4_WORD1_FS_LAYOUT_TYPES, 267 FATTR4_WORD2_LAYOUT_BLKSIZE 268 | FATTR4_WORD2_CLONE_BLKSIZE 269 | FATTR4_WORD2_CHANGE_ATTR_TYPE 270 | FATTR4_WORD2_XATTR_SUPPORT 271 }; 272 273 const u32 nfs4_fs_locations_bitmap[3] = { 274 FATTR4_WORD0_CHANGE 275 | FATTR4_WORD0_SIZE 276 | FATTR4_WORD0_FSID 277 | FATTR4_WORD0_FILEID 278 | FATTR4_WORD0_FS_LOCATIONS, 279 FATTR4_WORD1_OWNER 280 | FATTR4_WORD1_OWNER_GROUP 281 | FATTR4_WORD1_RAWDEV 282 | FATTR4_WORD1_SPACE_USED 283 | FATTR4_WORD1_TIME_ACCESS 284 | FATTR4_WORD1_TIME_METADATA 285 | FATTR4_WORD1_TIME_MODIFY 286 | FATTR4_WORD1_MOUNTED_ON_FILEID, 287 }; 288 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 290 struct inode *inode, unsigned long flags) 291 { 292 unsigned long cache_validity; 293 294 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 295 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 296 return; 297 298 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 299 300 /* Remove the attributes over which we have full control */ 301 dst[1] &= ~FATTR4_WORD1_RAWDEV; 302 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 303 dst[0] &= ~FATTR4_WORD0_SIZE; 304 305 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 306 dst[0] &= ~FATTR4_WORD0_CHANGE; 307 308 if (!(cache_validity & NFS_INO_INVALID_MODE)) 309 dst[1] &= ~FATTR4_WORD1_MODE; 310 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 311 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 312 } 313 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 315 struct nfs4_readdir_arg *readdir) 316 { 317 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 318 __be32 *start, *p; 319 320 if (cookie > 2) { 321 readdir->cookie = cookie; 322 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 323 return; 324 } 325 326 readdir->cookie = 0; 327 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 328 if (cookie == 2) 329 return; 330 331 /* 332 * NFSv4 servers do not return entries for '.' and '..' 333 * Therefore, we fake these entries here. We let '.' 334 * have cookie 0 and '..' have cookie 1. Note that 335 * when talking to the server, we always send cookie 0 336 * instead of 1 or 2. 337 */ 338 start = p = kmap_atomic(*readdir->pages); 339 340 if (cookie == 0) { 341 *p++ = xdr_one; /* next */ 342 *p++ = xdr_zero; /* cookie, first word */ 343 *p++ = xdr_one; /* cookie, second word */ 344 *p++ = xdr_one; /* entry len */ 345 memcpy(p, ".\0\0\0", 4); /* entry */ 346 p++; 347 *p++ = xdr_one; /* bitmap length */ 348 *p++ = htonl(attrs); /* bitmap */ 349 *p++ = htonl(12); /* attribute buffer length */ 350 *p++ = htonl(NF4DIR); 351 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 352 } 353 354 *p++ = xdr_one; /* next */ 355 *p++ = xdr_zero; /* cookie, first word */ 356 *p++ = xdr_two; /* cookie, second word */ 357 *p++ = xdr_two; /* entry len */ 358 memcpy(p, "..\0\0", 4); /* entry */ 359 p++; 360 *p++ = xdr_one; /* bitmap length */ 361 *p++ = htonl(attrs); /* bitmap */ 362 *p++ = htonl(12); /* attribute buffer length */ 363 *p++ = htonl(NF4DIR); 364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 365 366 readdir->pgbase = (char *)p - (char *)start; 367 readdir->count -= readdir->pgbase; 368 kunmap_atomic(start); 369 } 370 371 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 372 { 373 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 374 fattr->pre_change_attr = version; 375 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 376 } 377 } 378 379 static void nfs4_test_and_free_stateid(struct nfs_server *server, 380 nfs4_stateid *stateid, 381 const struct cred *cred) 382 { 383 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 384 385 ops->test_and_free_expired(server, stateid, cred); 386 } 387 388 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 389 nfs4_stateid *stateid, 390 const struct cred *cred) 391 { 392 stateid->type = NFS4_REVOKED_STATEID_TYPE; 393 nfs4_test_and_free_stateid(server, stateid, cred); 394 } 395 396 static void nfs4_free_revoked_stateid(struct nfs_server *server, 397 const nfs4_stateid *stateid, 398 const struct cred *cred) 399 { 400 nfs4_stateid tmp; 401 402 nfs4_stateid_copy(&tmp, stateid); 403 __nfs4_free_revoked_stateid(server, &tmp, cred); 404 } 405 406 static long nfs4_update_delay(long *timeout) 407 { 408 long ret; 409 if (!timeout) 410 return NFS4_POLL_RETRY_MAX; 411 if (*timeout <= 0) 412 *timeout = NFS4_POLL_RETRY_MIN; 413 if (*timeout > NFS4_POLL_RETRY_MAX) 414 *timeout = NFS4_POLL_RETRY_MAX; 415 ret = *timeout; 416 *timeout <<= 1; 417 return ret; 418 } 419 420 static int nfs4_delay_killable(long *timeout) 421 { 422 might_sleep(); 423 424 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 425 schedule_timeout(nfs4_update_delay(timeout)); 426 if (!__fatal_signal_pending(current)) 427 return 0; 428 return -EINTR; 429 } 430 431 static int nfs4_delay_interruptible(long *timeout) 432 { 433 might_sleep(); 434 435 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 436 schedule_timeout(nfs4_update_delay(timeout)); 437 if (!signal_pending(current)) 438 return 0; 439 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 440 } 441 442 static int nfs4_delay(long *timeout, bool interruptible) 443 { 444 if (interruptible) 445 return nfs4_delay_interruptible(timeout); 446 return nfs4_delay_killable(timeout); 447 } 448 449 static const nfs4_stateid * 450 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 451 { 452 if (!stateid) 453 return NULL; 454 switch (stateid->type) { 455 case NFS4_OPEN_STATEID_TYPE: 456 case NFS4_LOCK_STATEID_TYPE: 457 case NFS4_DELEGATION_STATEID_TYPE: 458 return stateid; 459 default: 460 break; 461 } 462 return NULL; 463 } 464 465 /* This is the error handling routine for processes that are allowed 466 * to sleep. 467 */ 468 static int nfs4_do_handle_exception(struct nfs_server *server, 469 int errorcode, struct nfs4_exception *exception) 470 { 471 struct nfs_client *clp = server->nfs_client; 472 struct nfs4_state *state = exception->state; 473 const nfs4_stateid *stateid; 474 struct inode *inode = exception->inode; 475 int ret = errorcode; 476 477 exception->delay = 0; 478 exception->recovering = 0; 479 exception->retry = 0; 480 481 stateid = nfs4_recoverable_stateid(exception->stateid); 482 if (stateid == NULL && state != NULL) 483 stateid = nfs4_recoverable_stateid(&state->stateid); 484 485 switch(errorcode) { 486 case 0: 487 return 0; 488 case -NFS4ERR_BADHANDLE: 489 case -ESTALE: 490 if (inode != NULL && S_ISREG(inode->i_mode)) 491 pnfs_destroy_layout(NFS_I(inode)); 492 break; 493 case -NFS4ERR_DELEG_REVOKED: 494 case -NFS4ERR_ADMIN_REVOKED: 495 case -NFS4ERR_EXPIRED: 496 case -NFS4ERR_BAD_STATEID: 497 case -NFS4ERR_PARTNER_NO_AUTH: 498 if (inode != NULL && stateid != NULL) { 499 nfs_inode_find_state_and_recover(inode, 500 stateid); 501 goto wait_on_recovery; 502 } 503 fallthrough; 504 case -NFS4ERR_OPENMODE: 505 if (inode) { 506 int err; 507 508 err = nfs_async_inode_return_delegation(inode, 509 stateid); 510 if (err == 0) 511 goto wait_on_recovery; 512 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 513 exception->retry = 1; 514 break; 515 } 516 } 517 if (state == NULL) 518 break; 519 ret = nfs4_schedule_stateid_recovery(server, state); 520 if (ret < 0) 521 break; 522 goto wait_on_recovery; 523 case -NFS4ERR_STALE_STATEID: 524 case -NFS4ERR_STALE_CLIENTID: 525 nfs4_schedule_lease_recovery(clp); 526 goto wait_on_recovery; 527 case -NFS4ERR_MOVED: 528 ret = nfs4_schedule_migration_recovery(server); 529 if (ret < 0) 530 break; 531 goto wait_on_recovery; 532 case -NFS4ERR_LEASE_MOVED: 533 nfs4_schedule_lease_moved_recovery(clp); 534 goto wait_on_recovery; 535 #if defined(CONFIG_NFS_V4_1) 536 case -NFS4ERR_BADSESSION: 537 case -NFS4ERR_BADSLOT: 538 case -NFS4ERR_BAD_HIGH_SLOT: 539 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 540 case -NFS4ERR_DEADSESSION: 541 case -NFS4ERR_SEQ_FALSE_RETRY: 542 case -NFS4ERR_SEQ_MISORDERED: 543 /* Handled in nfs41_sequence_process() */ 544 goto wait_on_recovery; 545 #endif /* defined(CONFIG_NFS_V4_1) */ 546 case -NFS4ERR_FILE_OPEN: 547 if (exception->timeout > HZ) { 548 /* We have retried a decent amount, time to 549 * fail 550 */ 551 ret = -EBUSY; 552 break; 553 } 554 fallthrough; 555 case -NFS4ERR_DELAY: 556 nfs_inc_server_stats(server, NFSIOS_DELAY); 557 fallthrough; 558 case -NFS4ERR_GRACE: 559 case -NFS4ERR_LAYOUTTRYLATER: 560 case -NFS4ERR_RECALLCONFLICT: 561 exception->delay = 1; 562 return 0; 563 564 case -NFS4ERR_RETRY_UNCACHED_REP: 565 case -NFS4ERR_OLD_STATEID: 566 exception->retry = 1; 567 break; 568 case -NFS4ERR_BADOWNER: 569 /* The following works around a Linux server bug! */ 570 case -NFS4ERR_BADNAME: 571 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 572 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 573 exception->retry = 1; 574 printk(KERN_WARNING "NFS: v4 server %s " 575 "does not accept raw " 576 "uid/gids. " 577 "Reenabling the idmapper.\n", 578 server->nfs_client->cl_hostname); 579 } 580 } 581 /* We failed to handle the error */ 582 return nfs4_map_errors(ret); 583 wait_on_recovery: 584 exception->recovering = 1; 585 return 0; 586 } 587 588 /* This is the error handling routine for processes that are allowed 589 * to sleep. 590 */ 591 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 592 { 593 struct nfs_client *clp = server->nfs_client; 594 int ret; 595 596 ret = nfs4_do_handle_exception(server, errorcode, exception); 597 if (exception->delay) { 598 ret = nfs4_delay(&exception->timeout, 599 exception->interruptible); 600 goto out_retry; 601 } 602 if (exception->recovering) { 603 if (exception->task_is_privileged) 604 return -EDEADLOCK; 605 ret = nfs4_wait_clnt_recover(clp); 606 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 607 return -EIO; 608 goto out_retry; 609 } 610 return ret; 611 out_retry: 612 if (ret == 0) 613 exception->retry = 1; 614 return ret; 615 } 616 617 static int 618 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 619 int errorcode, struct nfs4_exception *exception) 620 { 621 struct nfs_client *clp = server->nfs_client; 622 int ret; 623 624 ret = nfs4_do_handle_exception(server, errorcode, exception); 625 if (exception->delay) { 626 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 627 goto out_retry; 628 } 629 if (exception->recovering) { 630 if (exception->task_is_privileged) 631 return -EDEADLOCK; 632 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 633 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 634 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 635 goto out_retry; 636 } 637 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 638 ret = -EIO; 639 return ret; 640 out_retry: 641 if (ret == 0) { 642 exception->retry = 1; 643 /* 644 * For NFS4ERR_MOVED, the client transport will need to 645 * be recomputed after migration recovery has completed. 646 */ 647 if (errorcode == -NFS4ERR_MOVED) 648 rpc_task_release_transport(task); 649 } 650 return ret; 651 } 652 653 int 654 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 655 struct nfs4_state *state, long *timeout) 656 { 657 struct nfs4_exception exception = { 658 .state = state, 659 }; 660 661 if (task->tk_status >= 0) 662 return 0; 663 if (timeout) 664 exception.timeout = *timeout; 665 task->tk_status = nfs4_async_handle_exception(task, server, 666 task->tk_status, 667 &exception); 668 if (exception.delay && timeout) 669 *timeout = exception.timeout; 670 if (exception.retry) 671 return -EAGAIN; 672 return 0; 673 } 674 675 /* 676 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 677 * or 'false' otherwise. 678 */ 679 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 680 { 681 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 682 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 683 } 684 685 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 686 { 687 spin_lock(&clp->cl_lock); 688 if (time_before(clp->cl_last_renewal,timestamp)) 689 clp->cl_last_renewal = timestamp; 690 spin_unlock(&clp->cl_lock); 691 } 692 693 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 694 { 695 struct nfs_client *clp = server->nfs_client; 696 697 if (!nfs4_has_session(clp)) 698 do_renew_lease(clp, timestamp); 699 } 700 701 struct nfs4_call_sync_data { 702 const struct nfs_server *seq_server; 703 struct nfs4_sequence_args *seq_args; 704 struct nfs4_sequence_res *seq_res; 705 }; 706 707 void nfs4_init_sequence(struct nfs4_sequence_args *args, 708 struct nfs4_sequence_res *res, int cache_reply, 709 int privileged) 710 { 711 args->sa_slot = NULL; 712 args->sa_cache_this = cache_reply; 713 args->sa_privileged = privileged; 714 715 res->sr_slot = NULL; 716 } 717 718 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 719 { 720 struct nfs4_slot *slot = res->sr_slot; 721 struct nfs4_slot_table *tbl; 722 723 tbl = slot->table; 724 spin_lock(&tbl->slot_tbl_lock); 725 if (!nfs41_wake_and_assign_slot(tbl, slot)) 726 nfs4_free_slot(tbl, slot); 727 spin_unlock(&tbl->slot_tbl_lock); 728 729 res->sr_slot = NULL; 730 } 731 732 static int nfs40_sequence_done(struct rpc_task *task, 733 struct nfs4_sequence_res *res) 734 { 735 if (res->sr_slot != NULL) 736 nfs40_sequence_free_slot(res); 737 return 1; 738 } 739 740 #if defined(CONFIG_NFS_V4_1) 741 742 static void nfs41_release_slot(struct nfs4_slot *slot) 743 { 744 struct nfs4_session *session; 745 struct nfs4_slot_table *tbl; 746 bool send_new_highest_used_slotid = false; 747 748 if (!slot) 749 return; 750 tbl = slot->table; 751 session = tbl->session; 752 753 /* Bump the slot sequence number */ 754 if (slot->seq_done) 755 slot->seq_nr++; 756 slot->seq_done = 0; 757 758 spin_lock(&tbl->slot_tbl_lock); 759 /* Be nice to the server: try to ensure that the last transmitted 760 * value for highest_user_slotid <= target_highest_slotid 761 */ 762 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 763 send_new_highest_used_slotid = true; 764 765 if (nfs41_wake_and_assign_slot(tbl, slot)) { 766 send_new_highest_used_slotid = false; 767 goto out_unlock; 768 } 769 nfs4_free_slot(tbl, slot); 770 771 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 772 send_new_highest_used_slotid = false; 773 out_unlock: 774 spin_unlock(&tbl->slot_tbl_lock); 775 if (send_new_highest_used_slotid) 776 nfs41_notify_server(session->clp); 777 if (waitqueue_active(&tbl->slot_waitq)) 778 wake_up_all(&tbl->slot_waitq); 779 } 780 781 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 782 { 783 nfs41_release_slot(res->sr_slot); 784 res->sr_slot = NULL; 785 } 786 787 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 788 u32 seqnr) 789 { 790 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 791 slot->seq_nr_highest_sent = seqnr; 792 } 793 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 794 { 795 nfs4_slot_sequence_record_sent(slot, seqnr); 796 slot->seq_nr_last_acked = seqnr; 797 } 798 799 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 800 struct nfs4_slot *slot) 801 { 802 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 803 if (!IS_ERR(task)) 804 rpc_put_task_async(task); 805 } 806 807 static int nfs41_sequence_process(struct rpc_task *task, 808 struct nfs4_sequence_res *res) 809 { 810 struct nfs4_session *session; 811 struct nfs4_slot *slot = res->sr_slot; 812 struct nfs_client *clp; 813 int status; 814 int ret = 1; 815 816 if (slot == NULL) 817 goto out_noaction; 818 /* don't increment the sequence number if the task wasn't sent */ 819 if (!RPC_WAS_SENT(task) || slot->seq_done) 820 goto out; 821 822 session = slot->table->session; 823 clp = session->clp; 824 825 trace_nfs4_sequence_done(session, res); 826 827 status = res->sr_status; 828 if (task->tk_status == -NFS4ERR_DEADSESSION) 829 status = -NFS4ERR_DEADSESSION; 830 831 /* Check the SEQUENCE operation status */ 832 switch (status) { 833 case 0: 834 /* Mark this sequence number as having been acked */ 835 nfs4_slot_sequence_acked(slot, slot->seq_nr); 836 /* Update the slot's sequence and clientid lease timer */ 837 slot->seq_done = 1; 838 do_renew_lease(clp, res->sr_timestamp); 839 /* Check sequence flags */ 840 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 841 !!slot->privileged); 842 nfs41_update_target_slotid(slot->table, slot, res); 843 break; 844 case 1: 845 /* 846 * sr_status remains 1 if an RPC level error occurred. 847 * The server may or may not have processed the sequence 848 * operation.. 849 */ 850 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 851 slot->seq_done = 1; 852 goto out; 853 case -NFS4ERR_DELAY: 854 /* The server detected a resend of the RPC call and 855 * returned NFS4ERR_DELAY as per Section 2.10.6.2 856 * of RFC5661. 857 */ 858 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 859 __func__, 860 slot->slot_nr, 861 slot->seq_nr); 862 goto out_retry; 863 case -NFS4ERR_RETRY_UNCACHED_REP: 864 case -NFS4ERR_SEQ_FALSE_RETRY: 865 /* 866 * The server thinks we tried to replay a request. 867 * Retry the call after bumping the sequence ID. 868 */ 869 nfs4_slot_sequence_acked(slot, slot->seq_nr); 870 goto retry_new_seq; 871 case -NFS4ERR_BADSLOT: 872 /* 873 * The slot id we used was probably retired. Try again 874 * using a different slot id. 875 */ 876 if (slot->slot_nr < slot->table->target_highest_slotid) 877 goto session_recover; 878 goto retry_nowait; 879 case -NFS4ERR_SEQ_MISORDERED: 880 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 881 /* 882 * Were one or more calls using this slot interrupted? 883 * If the server never received the request, then our 884 * transmitted slot sequence number may be too high. However, 885 * if the server did receive the request then it might 886 * accidentally give us a reply with a mismatched operation. 887 * We can sort this out by sending a lone sequence operation 888 * to the server on the same slot. 889 */ 890 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 891 slot->seq_nr--; 892 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 893 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 894 res->sr_slot = NULL; 895 } 896 goto retry_nowait; 897 } 898 /* 899 * RFC5661: 900 * A retry might be sent while the original request is 901 * still in progress on the replier. The replier SHOULD 902 * deal with the issue by returning NFS4ERR_DELAY as the 903 * reply to SEQUENCE or CB_SEQUENCE operation, but 904 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 905 * 906 * Restart the search after a delay. 907 */ 908 slot->seq_nr = slot->seq_nr_highest_sent; 909 goto out_retry; 910 case -NFS4ERR_BADSESSION: 911 case -NFS4ERR_DEADSESSION: 912 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 913 goto session_recover; 914 default: 915 /* Just update the slot sequence no. */ 916 slot->seq_done = 1; 917 } 918 out: 919 /* The session may be reset by one of the error handlers. */ 920 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 921 out_noaction: 922 return ret; 923 session_recover: 924 nfs4_schedule_session_recovery(session, status); 925 dprintk("%s ERROR: %d Reset session\n", __func__, status); 926 nfs41_sequence_free_slot(res); 927 goto out; 928 retry_new_seq: 929 ++slot->seq_nr; 930 retry_nowait: 931 if (rpc_restart_call_prepare(task)) { 932 nfs41_sequence_free_slot(res); 933 task->tk_status = 0; 934 ret = 0; 935 } 936 goto out; 937 out_retry: 938 if (!rpc_restart_call(task)) 939 goto out; 940 rpc_delay(task, NFS4_POLL_RETRY_MAX); 941 return 0; 942 } 943 944 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 945 { 946 if (!nfs41_sequence_process(task, res)) 947 return 0; 948 if (res->sr_slot != NULL) 949 nfs41_sequence_free_slot(res); 950 return 1; 951 952 } 953 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 954 955 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 956 { 957 if (res->sr_slot == NULL) 958 return 1; 959 if (res->sr_slot->table->session != NULL) 960 return nfs41_sequence_process(task, res); 961 return nfs40_sequence_done(task, res); 962 } 963 964 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 965 { 966 if (res->sr_slot != NULL) { 967 if (res->sr_slot->table->session != NULL) 968 nfs41_sequence_free_slot(res); 969 else 970 nfs40_sequence_free_slot(res); 971 } 972 } 973 974 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 975 { 976 if (res->sr_slot == NULL) 977 return 1; 978 if (!res->sr_slot->table->session) 979 return nfs40_sequence_done(task, res); 980 return nfs41_sequence_done(task, res); 981 } 982 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 983 984 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 985 { 986 struct nfs4_call_sync_data *data = calldata; 987 988 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 989 990 nfs4_setup_sequence(data->seq_server->nfs_client, 991 data->seq_args, data->seq_res, task); 992 } 993 994 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 995 { 996 struct nfs4_call_sync_data *data = calldata; 997 998 nfs41_sequence_done(task, data->seq_res); 999 } 1000 1001 static const struct rpc_call_ops nfs41_call_sync_ops = { 1002 .rpc_call_prepare = nfs41_call_sync_prepare, 1003 .rpc_call_done = nfs41_call_sync_done, 1004 }; 1005 1006 #else /* !CONFIG_NFS_V4_1 */ 1007 1008 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1009 { 1010 return nfs40_sequence_done(task, res); 1011 } 1012 1013 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1014 { 1015 if (res->sr_slot != NULL) 1016 nfs40_sequence_free_slot(res); 1017 } 1018 1019 int nfs4_sequence_done(struct rpc_task *task, 1020 struct nfs4_sequence_res *res) 1021 { 1022 return nfs40_sequence_done(task, res); 1023 } 1024 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1025 1026 #endif /* !CONFIG_NFS_V4_1 */ 1027 1028 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1029 { 1030 res->sr_timestamp = jiffies; 1031 res->sr_status_flags = 0; 1032 res->sr_status = 1; 1033 } 1034 1035 static 1036 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1037 struct nfs4_sequence_res *res, 1038 struct nfs4_slot *slot) 1039 { 1040 if (!slot) 1041 return; 1042 slot->privileged = args->sa_privileged ? 1 : 0; 1043 args->sa_slot = slot; 1044 1045 res->sr_slot = slot; 1046 } 1047 1048 int nfs4_setup_sequence(struct nfs_client *client, 1049 struct nfs4_sequence_args *args, 1050 struct nfs4_sequence_res *res, 1051 struct rpc_task *task) 1052 { 1053 struct nfs4_session *session = nfs4_get_session(client); 1054 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1055 struct nfs4_slot *slot; 1056 1057 /* slot already allocated? */ 1058 if (res->sr_slot != NULL) 1059 goto out_start; 1060 1061 if (session) 1062 tbl = &session->fc_slot_table; 1063 1064 spin_lock(&tbl->slot_tbl_lock); 1065 /* The state manager will wait until the slot table is empty */ 1066 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1067 goto out_sleep; 1068 1069 slot = nfs4_alloc_slot(tbl); 1070 if (IS_ERR(slot)) { 1071 if (slot == ERR_PTR(-ENOMEM)) 1072 goto out_sleep_timeout; 1073 goto out_sleep; 1074 } 1075 spin_unlock(&tbl->slot_tbl_lock); 1076 1077 nfs4_sequence_attach_slot(args, res, slot); 1078 1079 trace_nfs4_setup_sequence(session, args); 1080 out_start: 1081 nfs41_sequence_res_init(res); 1082 rpc_call_start(task); 1083 return 0; 1084 out_sleep_timeout: 1085 /* Try again in 1/4 second */ 1086 if (args->sa_privileged) 1087 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1088 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1089 else 1090 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1091 NULL, jiffies + (HZ >> 2)); 1092 spin_unlock(&tbl->slot_tbl_lock); 1093 return -EAGAIN; 1094 out_sleep: 1095 if (args->sa_privileged) 1096 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1097 RPC_PRIORITY_PRIVILEGED); 1098 else 1099 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1100 spin_unlock(&tbl->slot_tbl_lock); 1101 return -EAGAIN; 1102 } 1103 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1104 1105 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1106 { 1107 struct nfs4_call_sync_data *data = calldata; 1108 nfs4_setup_sequence(data->seq_server->nfs_client, 1109 data->seq_args, data->seq_res, task); 1110 } 1111 1112 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1113 { 1114 struct nfs4_call_sync_data *data = calldata; 1115 nfs4_sequence_done(task, data->seq_res); 1116 } 1117 1118 static const struct rpc_call_ops nfs40_call_sync_ops = { 1119 .rpc_call_prepare = nfs40_call_sync_prepare, 1120 .rpc_call_done = nfs40_call_sync_done, 1121 }; 1122 1123 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1124 { 1125 int ret; 1126 struct rpc_task *task; 1127 1128 task = rpc_run_task(task_setup); 1129 if (IS_ERR(task)) 1130 return PTR_ERR(task); 1131 1132 ret = task->tk_status; 1133 rpc_put_task(task); 1134 return ret; 1135 } 1136 1137 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1138 struct nfs_server *server, 1139 struct rpc_message *msg, 1140 struct nfs4_sequence_args *args, 1141 struct nfs4_sequence_res *res, 1142 unsigned short task_flags) 1143 { 1144 struct nfs_client *clp = server->nfs_client; 1145 struct nfs4_call_sync_data data = { 1146 .seq_server = server, 1147 .seq_args = args, 1148 .seq_res = res, 1149 }; 1150 struct rpc_task_setup task_setup = { 1151 .rpc_client = clnt, 1152 .rpc_message = msg, 1153 .callback_ops = clp->cl_mvops->call_sync_ops, 1154 .callback_data = &data, 1155 .flags = task_flags, 1156 }; 1157 1158 return nfs4_call_sync_custom(&task_setup); 1159 } 1160 1161 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1162 struct nfs_server *server, 1163 struct rpc_message *msg, 1164 struct nfs4_sequence_args *args, 1165 struct nfs4_sequence_res *res) 1166 { 1167 unsigned short task_flags = 0; 1168 1169 if (server->caps & NFS_CAP_MOVEABLE) 1170 task_flags = RPC_TASK_MOVEABLE; 1171 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1172 } 1173 1174 1175 int nfs4_call_sync(struct rpc_clnt *clnt, 1176 struct nfs_server *server, 1177 struct rpc_message *msg, 1178 struct nfs4_sequence_args *args, 1179 struct nfs4_sequence_res *res, 1180 int cache_reply) 1181 { 1182 nfs4_init_sequence(args, res, cache_reply, 0); 1183 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1184 } 1185 1186 static void 1187 nfs4_inc_nlink_locked(struct inode *inode) 1188 { 1189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1190 NFS_INO_INVALID_CTIME | 1191 NFS_INO_INVALID_NLINK); 1192 inc_nlink(inode); 1193 } 1194 1195 static void 1196 nfs4_inc_nlink(struct inode *inode) 1197 { 1198 spin_lock(&inode->i_lock); 1199 nfs4_inc_nlink_locked(inode); 1200 spin_unlock(&inode->i_lock); 1201 } 1202 1203 static void 1204 nfs4_dec_nlink_locked(struct inode *inode) 1205 { 1206 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1207 NFS_INO_INVALID_CTIME | 1208 NFS_INO_INVALID_NLINK); 1209 drop_nlink(inode); 1210 } 1211 1212 static void 1213 nfs4_update_changeattr_locked(struct inode *inode, 1214 struct nfs4_change_info *cinfo, 1215 unsigned long timestamp, unsigned long cache_validity) 1216 { 1217 struct nfs_inode *nfsi = NFS_I(inode); 1218 u64 change_attr = inode_peek_iversion_raw(inode); 1219 1220 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1221 if (S_ISDIR(inode->i_mode)) 1222 cache_validity |= NFS_INO_INVALID_DATA; 1223 1224 switch (NFS_SERVER(inode)->change_attr_type) { 1225 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1226 if (cinfo->after == change_attr) 1227 goto out; 1228 break; 1229 default: 1230 if ((s64)(change_attr - cinfo->after) >= 0) 1231 goto out; 1232 } 1233 1234 inode_set_iversion_raw(inode, cinfo->after); 1235 if (!cinfo->atomic || cinfo->before != change_attr) { 1236 if (S_ISDIR(inode->i_mode)) 1237 nfs_force_lookup_revalidate(inode); 1238 1239 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1240 cache_validity |= 1241 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1242 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1243 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1244 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1245 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1246 } 1247 nfsi->attrtimeo_timestamp = jiffies; 1248 nfsi->read_cache_jiffies = timestamp; 1249 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1250 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1251 out: 1252 nfs_set_cache_invalid(inode, cache_validity); 1253 } 1254 1255 void 1256 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1257 unsigned long timestamp, unsigned long cache_validity) 1258 { 1259 spin_lock(&dir->i_lock); 1260 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1261 spin_unlock(&dir->i_lock); 1262 } 1263 1264 struct nfs4_open_createattrs { 1265 struct nfs4_label *label; 1266 struct iattr *sattr; 1267 const __u32 verf[2]; 1268 }; 1269 1270 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1271 int err, struct nfs4_exception *exception) 1272 { 1273 if (err != -EINVAL) 1274 return false; 1275 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1276 return false; 1277 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1278 exception->retry = 1; 1279 return true; 1280 } 1281 1282 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1283 { 1284 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1285 } 1286 1287 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1288 { 1289 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1290 1291 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1292 } 1293 1294 static u32 1295 nfs4_map_atomic_open_share(struct nfs_server *server, 1296 fmode_t fmode, int openflags) 1297 { 1298 u32 res = 0; 1299 1300 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1301 case FMODE_READ: 1302 res = NFS4_SHARE_ACCESS_READ; 1303 break; 1304 case FMODE_WRITE: 1305 res = NFS4_SHARE_ACCESS_WRITE; 1306 break; 1307 case FMODE_READ|FMODE_WRITE: 1308 res = NFS4_SHARE_ACCESS_BOTH; 1309 } 1310 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1311 goto out; 1312 /* Want no delegation if we're using O_DIRECT */ 1313 if (openflags & O_DIRECT) 1314 res |= NFS4_SHARE_WANT_NO_DELEG; 1315 out: 1316 return res; 1317 } 1318 1319 static enum open_claim_type4 1320 nfs4_map_atomic_open_claim(struct nfs_server *server, 1321 enum open_claim_type4 claim) 1322 { 1323 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1324 return claim; 1325 switch (claim) { 1326 default: 1327 return claim; 1328 case NFS4_OPEN_CLAIM_FH: 1329 return NFS4_OPEN_CLAIM_NULL; 1330 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1331 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1332 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1333 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1334 } 1335 } 1336 1337 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1338 { 1339 p->o_res.f_attr = &p->f_attr; 1340 p->o_res.seqid = p->o_arg.seqid; 1341 p->c_res.seqid = p->c_arg.seqid; 1342 p->o_res.server = p->o_arg.server; 1343 p->o_res.access_request = p->o_arg.access; 1344 nfs_fattr_init(&p->f_attr); 1345 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1346 } 1347 1348 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1349 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1350 const struct nfs4_open_createattrs *c, 1351 enum open_claim_type4 claim, 1352 gfp_t gfp_mask) 1353 { 1354 struct dentry *parent = dget_parent(dentry); 1355 struct inode *dir = d_inode(parent); 1356 struct nfs_server *server = NFS_SERVER(dir); 1357 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1358 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1359 struct nfs4_opendata *p; 1360 1361 p = kzalloc(sizeof(*p), gfp_mask); 1362 if (p == NULL) 1363 goto err; 1364 1365 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1366 if (IS_ERR(p->f_attr.label)) 1367 goto err_free_p; 1368 1369 p->a_label = nfs4_label_alloc(server, gfp_mask); 1370 if (IS_ERR(p->a_label)) 1371 goto err_free_f; 1372 1373 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1374 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1375 if (IS_ERR(p->o_arg.seqid)) 1376 goto err_free_label; 1377 nfs_sb_active(dentry->d_sb); 1378 p->dentry = dget(dentry); 1379 p->dir = parent; 1380 p->owner = sp; 1381 atomic_inc(&sp->so_count); 1382 p->o_arg.open_flags = flags; 1383 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1384 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1385 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1386 fmode, flags); 1387 if (flags & O_CREAT) { 1388 p->o_arg.umask = current_umask(); 1389 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1390 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1391 p->o_arg.u.attrs = &p->attrs; 1392 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1393 1394 memcpy(p->o_arg.u.verifier.data, c->verf, 1395 sizeof(p->o_arg.u.verifier.data)); 1396 } 1397 } 1398 /* ask server to check for all possible rights as results 1399 * are cached */ 1400 switch (p->o_arg.claim) { 1401 default: 1402 break; 1403 case NFS4_OPEN_CLAIM_NULL: 1404 case NFS4_OPEN_CLAIM_FH: 1405 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1406 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1407 NFS4_ACCESS_EXECUTE | 1408 nfs_access_xattr_mask(server); 1409 } 1410 p->o_arg.clientid = server->nfs_client->cl_clientid; 1411 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1412 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1413 p->o_arg.name = &dentry->d_name; 1414 p->o_arg.server = server; 1415 p->o_arg.bitmask = nfs4_bitmask(server, label); 1416 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1417 switch (p->o_arg.claim) { 1418 case NFS4_OPEN_CLAIM_NULL: 1419 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1420 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1421 p->o_arg.fh = NFS_FH(dir); 1422 break; 1423 case NFS4_OPEN_CLAIM_PREVIOUS: 1424 case NFS4_OPEN_CLAIM_FH: 1425 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1426 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1427 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1428 } 1429 p->c_arg.fh = &p->o_res.fh; 1430 p->c_arg.stateid = &p->o_res.stateid; 1431 p->c_arg.seqid = p->o_arg.seqid; 1432 nfs4_init_opendata_res(p); 1433 kref_init(&p->kref); 1434 return p; 1435 1436 err_free_label: 1437 nfs4_label_free(p->a_label); 1438 err_free_f: 1439 nfs4_label_free(p->f_attr.label); 1440 err_free_p: 1441 kfree(p); 1442 err: 1443 dput(parent); 1444 return NULL; 1445 } 1446 1447 static void nfs4_opendata_free(struct kref *kref) 1448 { 1449 struct nfs4_opendata *p = container_of(kref, 1450 struct nfs4_opendata, kref); 1451 struct super_block *sb = p->dentry->d_sb; 1452 1453 nfs4_lgopen_release(p->lgp); 1454 nfs_free_seqid(p->o_arg.seqid); 1455 nfs4_sequence_free_slot(&p->o_res.seq_res); 1456 if (p->state != NULL) 1457 nfs4_put_open_state(p->state); 1458 nfs4_put_state_owner(p->owner); 1459 1460 nfs4_label_free(p->a_label); 1461 nfs4_label_free(p->f_attr.label); 1462 1463 dput(p->dir); 1464 dput(p->dentry); 1465 nfs_sb_deactive(sb); 1466 nfs_fattr_free_names(&p->f_attr); 1467 kfree(p->f_attr.mdsthreshold); 1468 kfree(p); 1469 } 1470 1471 static void nfs4_opendata_put(struct nfs4_opendata *p) 1472 { 1473 if (p != NULL) 1474 kref_put(&p->kref, nfs4_opendata_free); 1475 } 1476 1477 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1478 fmode_t fmode) 1479 { 1480 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1481 case FMODE_READ|FMODE_WRITE: 1482 return state->n_rdwr != 0; 1483 case FMODE_WRITE: 1484 return state->n_wronly != 0; 1485 case FMODE_READ: 1486 return state->n_rdonly != 0; 1487 } 1488 WARN_ON_ONCE(1); 1489 return false; 1490 } 1491 1492 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1493 int open_mode, enum open_claim_type4 claim) 1494 { 1495 int ret = 0; 1496 1497 if (open_mode & (O_EXCL|O_TRUNC)) 1498 goto out; 1499 switch (claim) { 1500 case NFS4_OPEN_CLAIM_NULL: 1501 case NFS4_OPEN_CLAIM_FH: 1502 goto out; 1503 default: 1504 break; 1505 } 1506 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1507 case FMODE_READ: 1508 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1509 && state->n_rdonly != 0; 1510 break; 1511 case FMODE_WRITE: 1512 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1513 && state->n_wronly != 0; 1514 break; 1515 case FMODE_READ|FMODE_WRITE: 1516 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1517 && state->n_rdwr != 0; 1518 } 1519 out: 1520 return ret; 1521 } 1522 1523 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1524 enum open_claim_type4 claim) 1525 { 1526 if (delegation == NULL) 1527 return 0; 1528 if ((delegation->type & fmode) != fmode) 1529 return 0; 1530 switch (claim) { 1531 case NFS4_OPEN_CLAIM_NULL: 1532 case NFS4_OPEN_CLAIM_FH: 1533 break; 1534 case NFS4_OPEN_CLAIM_PREVIOUS: 1535 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1536 break; 1537 fallthrough; 1538 default: 1539 return 0; 1540 } 1541 nfs_mark_delegation_referenced(delegation); 1542 return 1; 1543 } 1544 1545 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1546 { 1547 switch (fmode) { 1548 case FMODE_WRITE: 1549 state->n_wronly++; 1550 break; 1551 case FMODE_READ: 1552 state->n_rdonly++; 1553 break; 1554 case FMODE_READ|FMODE_WRITE: 1555 state->n_rdwr++; 1556 } 1557 nfs4_state_set_mode_locked(state, state->state | fmode); 1558 } 1559 1560 #ifdef CONFIG_NFS_V4_1 1561 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1562 { 1563 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1564 return true; 1565 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1566 return true; 1567 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1568 return true; 1569 return false; 1570 } 1571 #endif /* CONFIG_NFS_V4_1 */ 1572 1573 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1574 { 1575 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1576 wake_up_all(&state->waitq); 1577 } 1578 1579 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1580 { 1581 struct nfs_client *clp = state->owner->so_server->nfs_client; 1582 bool need_recover = false; 1583 1584 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1585 need_recover = true; 1586 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1587 need_recover = true; 1588 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1589 need_recover = true; 1590 if (need_recover) 1591 nfs4_state_mark_reclaim_nograce(clp, state); 1592 } 1593 1594 /* 1595 * Check for whether or not the caller may update the open stateid 1596 * to the value passed in by stateid. 1597 * 1598 * Note: This function relies heavily on the server implementing 1599 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1600 * correctly. 1601 * i.e. The stateid seqids have to be initialised to 1, and 1602 * are then incremented on every state transition. 1603 */ 1604 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1605 const nfs4_stateid *stateid) 1606 { 1607 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1608 /* The common case - we're updating to a new sequence number */ 1609 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1610 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1611 return true; 1612 return false; 1613 } 1614 /* The server returned a new stateid */ 1615 } 1616 /* This is the first OPEN in this generation */ 1617 if (stateid->seqid == cpu_to_be32(1)) 1618 return true; 1619 return false; 1620 } 1621 1622 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1623 { 1624 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1625 return; 1626 if (state->n_wronly) 1627 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1628 if (state->n_rdonly) 1629 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1630 if (state->n_rdwr) 1631 set_bit(NFS_O_RDWR_STATE, &state->flags); 1632 set_bit(NFS_OPEN_STATE, &state->flags); 1633 } 1634 1635 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1636 nfs4_stateid *stateid, fmode_t fmode) 1637 { 1638 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1639 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1640 case FMODE_WRITE: 1641 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1642 break; 1643 case FMODE_READ: 1644 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1645 break; 1646 case 0: 1647 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1648 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1649 clear_bit(NFS_OPEN_STATE, &state->flags); 1650 } 1651 if (stateid == NULL) 1652 return; 1653 /* Handle OPEN+OPEN_DOWNGRADE races */ 1654 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1655 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1656 nfs_resync_open_stateid_locked(state); 1657 goto out; 1658 } 1659 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1660 nfs4_stateid_copy(&state->stateid, stateid); 1661 nfs4_stateid_copy(&state->open_stateid, stateid); 1662 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1663 out: 1664 nfs_state_log_update_open_stateid(state); 1665 } 1666 1667 static void nfs_clear_open_stateid(struct nfs4_state *state, 1668 nfs4_stateid *arg_stateid, 1669 nfs4_stateid *stateid, fmode_t fmode) 1670 { 1671 write_seqlock(&state->seqlock); 1672 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1673 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1674 nfs_clear_open_stateid_locked(state, stateid, fmode); 1675 write_sequnlock(&state->seqlock); 1676 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1677 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1678 } 1679 1680 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1681 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1682 __must_hold(&state->owner->so_lock) 1683 __must_hold(&state->seqlock) 1684 __must_hold(RCU) 1685 1686 { 1687 DEFINE_WAIT(wait); 1688 int status = 0; 1689 for (;;) { 1690 1691 if (nfs_stateid_is_sequential(state, stateid)) 1692 break; 1693 1694 if (status) 1695 break; 1696 /* Rely on seqids for serialisation with NFSv4.0 */ 1697 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1698 break; 1699 1700 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1701 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1702 /* 1703 * Ensure we process the state changes in the same order 1704 * in which the server processed them by delaying the 1705 * update of the stateid until we are in sequence. 1706 */ 1707 write_sequnlock(&state->seqlock); 1708 spin_unlock(&state->owner->so_lock); 1709 rcu_read_unlock(); 1710 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1711 1712 if (!fatal_signal_pending(current)) { 1713 if (schedule_timeout(5*HZ) == 0) 1714 status = -EAGAIN; 1715 else 1716 status = 0; 1717 } else 1718 status = -EINTR; 1719 finish_wait(&state->waitq, &wait); 1720 rcu_read_lock(); 1721 spin_lock(&state->owner->so_lock); 1722 write_seqlock(&state->seqlock); 1723 } 1724 1725 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1726 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1727 nfs4_stateid_copy(freeme, &state->open_stateid); 1728 nfs_test_and_clear_all_open_stateid(state); 1729 } 1730 1731 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1732 nfs4_stateid_copy(&state->stateid, stateid); 1733 nfs4_stateid_copy(&state->open_stateid, stateid); 1734 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1735 nfs_state_log_update_open_stateid(state); 1736 } 1737 1738 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1739 const nfs4_stateid *open_stateid, 1740 fmode_t fmode, 1741 nfs4_stateid *freeme) 1742 { 1743 /* 1744 * Protect the call to nfs4_state_set_mode_locked and 1745 * serialise the stateid update 1746 */ 1747 write_seqlock(&state->seqlock); 1748 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1749 switch (fmode) { 1750 case FMODE_READ: 1751 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1752 break; 1753 case FMODE_WRITE: 1754 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1755 break; 1756 case FMODE_READ|FMODE_WRITE: 1757 set_bit(NFS_O_RDWR_STATE, &state->flags); 1758 } 1759 set_bit(NFS_OPEN_STATE, &state->flags); 1760 write_sequnlock(&state->seqlock); 1761 } 1762 1763 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1764 { 1765 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1766 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1767 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1768 clear_bit(NFS_OPEN_STATE, &state->flags); 1769 } 1770 1771 static void nfs_state_set_delegation(struct nfs4_state *state, 1772 const nfs4_stateid *deleg_stateid, 1773 fmode_t fmode) 1774 { 1775 /* 1776 * Protect the call to nfs4_state_set_mode_locked and 1777 * serialise the stateid update 1778 */ 1779 write_seqlock(&state->seqlock); 1780 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1781 set_bit(NFS_DELEGATED_STATE, &state->flags); 1782 write_sequnlock(&state->seqlock); 1783 } 1784 1785 static void nfs_state_clear_delegation(struct nfs4_state *state) 1786 { 1787 write_seqlock(&state->seqlock); 1788 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1789 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1790 write_sequnlock(&state->seqlock); 1791 } 1792 1793 int update_open_stateid(struct nfs4_state *state, 1794 const nfs4_stateid *open_stateid, 1795 const nfs4_stateid *delegation, 1796 fmode_t fmode) 1797 { 1798 struct nfs_server *server = NFS_SERVER(state->inode); 1799 struct nfs_client *clp = server->nfs_client; 1800 struct nfs_inode *nfsi = NFS_I(state->inode); 1801 struct nfs_delegation *deleg_cur; 1802 nfs4_stateid freeme = { }; 1803 int ret = 0; 1804 1805 fmode &= (FMODE_READ|FMODE_WRITE); 1806 1807 rcu_read_lock(); 1808 spin_lock(&state->owner->so_lock); 1809 if (open_stateid != NULL) { 1810 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1811 ret = 1; 1812 } 1813 1814 deleg_cur = nfs4_get_valid_delegation(state->inode); 1815 if (deleg_cur == NULL) 1816 goto no_delegation; 1817 1818 spin_lock(&deleg_cur->lock); 1819 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1820 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1821 (deleg_cur->type & fmode) != fmode) 1822 goto no_delegation_unlock; 1823 1824 if (delegation == NULL) 1825 delegation = &deleg_cur->stateid; 1826 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1827 goto no_delegation_unlock; 1828 1829 nfs_mark_delegation_referenced(deleg_cur); 1830 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1831 ret = 1; 1832 no_delegation_unlock: 1833 spin_unlock(&deleg_cur->lock); 1834 no_delegation: 1835 if (ret) 1836 update_open_stateflags(state, fmode); 1837 spin_unlock(&state->owner->so_lock); 1838 rcu_read_unlock(); 1839 1840 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1841 nfs4_schedule_state_manager(clp); 1842 if (freeme.type != 0) 1843 nfs4_test_and_free_stateid(server, &freeme, 1844 state->owner->so_cred); 1845 1846 return ret; 1847 } 1848 1849 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1850 const nfs4_stateid *stateid) 1851 { 1852 struct nfs4_state *state = lsp->ls_state; 1853 bool ret = false; 1854 1855 spin_lock(&state->state_lock); 1856 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1857 goto out_noupdate; 1858 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1859 goto out_noupdate; 1860 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1861 ret = true; 1862 out_noupdate: 1863 spin_unlock(&state->state_lock); 1864 return ret; 1865 } 1866 1867 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1868 { 1869 struct nfs_delegation *delegation; 1870 1871 fmode &= FMODE_READ|FMODE_WRITE; 1872 rcu_read_lock(); 1873 delegation = nfs4_get_valid_delegation(inode); 1874 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1875 rcu_read_unlock(); 1876 return; 1877 } 1878 rcu_read_unlock(); 1879 nfs4_inode_return_delegation(inode); 1880 } 1881 1882 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1883 { 1884 struct nfs4_state *state = opendata->state; 1885 struct nfs_delegation *delegation; 1886 int open_mode = opendata->o_arg.open_flags; 1887 fmode_t fmode = opendata->o_arg.fmode; 1888 enum open_claim_type4 claim = opendata->o_arg.claim; 1889 nfs4_stateid stateid; 1890 int ret = -EAGAIN; 1891 1892 for (;;) { 1893 spin_lock(&state->owner->so_lock); 1894 if (can_open_cached(state, fmode, open_mode, claim)) { 1895 update_open_stateflags(state, fmode); 1896 spin_unlock(&state->owner->so_lock); 1897 goto out_return_state; 1898 } 1899 spin_unlock(&state->owner->so_lock); 1900 rcu_read_lock(); 1901 delegation = nfs4_get_valid_delegation(state->inode); 1902 if (!can_open_delegated(delegation, fmode, claim)) { 1903 rcu_read_unlock(); 1904 break; 1905 } 1906 /* Save the delegation */ 1907 nfs4_stateid_copy(&stateid, &delegation->stateid); 1908 rcu_read_unlock(); 1909 nfs_release_seqid(opendata->o_arg.seqid); 1910 if (!opendata->is_recover) { 1911 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1912 if (ret != 0) 1913 goto out; 1914 } 1915 ret = -EAGAIN; 1916 1917 /* Try to update the stateid using the delegation */ 1918 if (update_open_stateid(state, NULL, &stateid, fmode)) 1919 goto out_return_state; 1920 } 1921 out: 1922 return ERR_PTR(ret); 1923 out_return_state: 1924 refcount_inc(&state->count); 1925 return state; 1926 } 1927 1928 static void 1929 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1930 { 1931 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1932 struct nfs_delegation *delegation; 1933 int delegation_flags = 0; 1934 1935 rcu_read_lock(); 1936 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1937 if (delegation) 1938 delegation_flags = delegation->flags; 1939 rcu_read_unlock(); 1940 switch (data->o_arg.claim) { 1941 default: 1942 break; 1943 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1944 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1945 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1946 "returning a delegation for " 1947 "OPEN(CLAIM_DELEGATE_CUR)\n", 1948 clp->cl_hostname); 1949 return; 1950 } 1951 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1952 nfs_inode_set_delegation(state->inode, 1953 data->owner->so_cred, 1954 data->o_res.delegation_type, 1955 &data->o_res.delegation, 1956 data->o_res.pagemod_limit); 1957 else 1958 nfs_inode_reclaim_delegation(state->inode, 1959 data->owner->so_cred, 1960 data->o_res.delegation_type, 1961 &data->o_res.delegation, 1962 data->o_res.pagemod_limit); 1963 1964 if (data->o_res.do_recall) 1965 nfs_async_inode_return_delegation(state->inode, 1966 &data->o_res.delegation); 1967 } 1968 1969 /* 1970 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1971 * and update the nfs4_state. 1972 */ 1973 static struct nfs4_state * 1974 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1975 { 1976 struct inode *inode = data->state->inode; 1977 struct nfs4_state *state = data->state; 1978 int ret; 1979 1980 if (!data->rpc_done) { 1981 if (data->rpc_status) 1982 return ERR_PTR(data->rpc_status); 1983 /* cached opens have already been processed */ 1984 goto update; 1985 } 1986 1987 ret = nfs_refresh_inode(inode, &data->f_attr); 1988 if (ret) 1989 return ERR_PTR(ret); 1990 1991 if (data->o_res.delegation_type != 0) 1992 nfs4_opendata_check_deleg(data, state); 1993 update: 1994 if (!update_open_stateid(state, &data->o_res.stateid, 1995 NULL, data->o_arg.fmode)) 1996 return ERR_PTR(-EAGAIN); 1997 refcount_inc(&state->count); 1998 1999 return state; 2000 } 2001 2002 static struct inode * 2003 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2004 { 2005 struct inode *inode; 2006 2007 switch (data->o_arg.claim) { 2008 case NFS4_OPEN_CLAIM_NULL: 2009 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2010 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2011 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2012 return ERR_PTR(-EAGAIN); 2013 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2014 &data->f_attr); 2015 break; 2016 default: 2017 inode = d_inode(data->dentry); 2018 ihold(inode); 2019 nfs_refresh_inode(inode, &data->f_attr); 2020 } 2021 return inode; 2022 } 2023 2024 static struct nfs4_state * 2025 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2026 { 2027 struct nfs4_state *state; 2028 struct inode *inode; 2029 2030 inode = nfs4_opendata_get_inode(data); 2031 if (IS_ERR(inode)) 2032 return ERR_CAST(inode); 2033 if (data->state != NULL && data->state->inode == inode) { 2034 state = data->state; 2035 refcount_inc(&state->count); 2036 } else 2037 state = nfs4_get_open_state(inode, data->owner); 2038 iput(inode); 2039 if (state == NULL) 2040 state = ERR_PTR(-ENOMEM); 2041 return state; 2042 } 2043 2044 static struct nfs4_state * 2045 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2046 { 2047 struct nfs4_state *state; 2048 2049 if (!data->rpc_done) { 2050 state = nfs4_try_open_cached(data); 2051 trace_nfs4_cached_open(data->state); 2052 goto out; 2053 } 2054 2055 state = nfs4_opendata_find_nfs4_state(data); 2056 if (IS_ERR(state)) 2057 goto out; 2058 2059 if (data->o_res.delegation_type != 0) 2060 nfs4_opendata_check_deleg(data, state); 2061 if (!update_open_stateid(state, &data->o_res.stateid, 2062 NULL, data->o_arg.fmode)) { 2063 nfs4_put_open_state(state); 2064 state = ERR_PTR(-EAGAIN); 2065 } 2066 out: 2067 nfs_release_seqid(data->o_arg.seqid); 2068 return state; 2069 } 2070 2071 static struct nfs4_state * 2072 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2073 { 2074 struct nfs4_state *ret; 2075 2076 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2077 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2078 else 2079 ret = _nfs4_opendata_to_nfs4_state(data); 2080 nfs4_sequence_free_slot(&data->o_res.seq_res); 2081 return ret; 2082 } 2083 2084 static struct nfs_open_context * 2085 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2086 { 2087 struct nfs_inode *nfsi = NFS_I(state->inode); 2088 struct nfs_open_context *ctx; 2089 2090 rcu_read_lock(); 2091 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2092 if (ctx->state != state) 2093 continue; 2094 if ((ctx->mode & mode) != mode) 2095 continue; 2096 if (!get_nfs_open_context(ctx)) 2097 continue; 2098 rcu_read_unlock(); 2099 return ctx; 2100 } 2101 rcu_read_unlock(); 2102 return ERR_PTR(-ENOENT); 2103 } 2104 2105 static struct nfs_open_context * 2106 nfs4_state_find_open_context(struct nfs4_state *state) 2107 { 2108 struct nfs_open_context *ctx; 2109 2110 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2111 if (!IS_ERR(ctx)) 2112 return ctx; 2113 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2114 if (!IS_ERR(ctx)) 2115 return ctx; 2116 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2117 } 2118 2119 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2120 struct nfs4_state *state, enum open_claim_type4 claim) 2121 { 2122 struct nfs4_opendata *opendata; 2123 2124 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2125 NULL, claim, GFP_NOFS); 2126 if (opendata == NULL) 2127 return ERR_PTR(-ENOMEM); 2128 opendata->state = state; 2129 refcount_inc(&state->count); 2130 return opendata; 2131 } 2132 2133 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2134 fmode_t fmode) 2135 { 2136 struct nfs4_state *newstate; 2137 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2138 int openflags = opendata->o_arg.open_flags; 2139 int ret; 2140 2141 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2142 return 0; 2143 opendata->o_arg.fmode = fmode; 2144 opendata->o_arg.share_access = 2145 nfs4_map_atomic_open_share(server, fmode, openflags); 2146 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2147 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2148 nfs4_init_opendata_res(opendata); 2149 ret = _nfs4_recover_proc_open(opendata); 2150 if (ret != 0) 2151 return ret; 2152 newstate = nfs4_opendata_to_nfs4_state(opendata); 2153 if (IS_ERR(newstate)) 2154 return PTR_ERR(newstate); 2155 if (newstate != opendata->state) 2156 ret = -ESTALE; 2157 nfs4_close_state(newstate, fmode); 2158 return ret; 2159 } 2160 2161 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2162 { 2163 int ret; 2164 2165 /* memory barrier prior to reading state->n_* */ 2166 smp_rmb(); 2167 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2168 if (ret != 0) 2169 return ret; 2170 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2171 if (ret != 0) 2172 return ret; 2173 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2174 if (ret != 0) 2175 return ret; 2176 /* 2177 * We may have performed cached opens for all three recoveries. 2178 * Check if we need to update the current stateid. 2179 */ 2180 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2181 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2182 write_seqlock(&state->seqlock); 2183 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2184 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2185 write_sequnlock(&state->seqlock); 2186 } 2187 return 0; 2188 } 2189 2190 /* 2191 * OPEN_RECLAIM: 2192 * reclaim state on the server after a reboot. 2193 */ 2194 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2195 { 2196 struct nfs_delegation *delegation; 2197 struct nfs4_opendata *opendata; 2198 fmode_t delegation_type = 0; 2199 int status; 2200 2201 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2202 NFS4_OPEN_CLAIM_PREVIOUS); 2203 if (IS_ERR(opendata)) 2204 return PTR_ERR(opendata); 2205 rcu_read_lock(); 2206 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2207 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2208 delegation_type = delegation->type; 2209 rcu_read_unlock(); 2210 opendata->o_arg.u.delegation_type = delegation_type; 2211 status = nfs4_open_recover(opendata, state); 2212 nfs4_opendata_put(opendata); 2213 return status; 2214 } 2215 2216 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2217 { 2218 struct nfs_server *server = NFS_SERVER(state->inode); 2219 struct nfs4_exception exception = { }; 2220 int err; 2221 do { 2222 err = _nfs4_do_open_reclaim(ctx, state); 2223 trace_nfs4_open_reclaim(ctx, 0, err); 2224 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2225 continue; 2226 if (err != -NFS4ERR_DELAY) 2227 break; 2228 nfs4_handle_exception(server, err, &exception); 2229 } while (exception.retry); 2230 return err; 2231 } 2232 2233 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2234 { 2235 struct nfs_open_context *ctx; 2236 int ret; 2237 2238 ctx = nfs4_state_find_open_context(state); 2239 if (IS_ERR(ctx)) 2240 return -EAGAIN; 2241 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2242 nfs_state_clear_open_state_flags(state); 2243 ret = nfs4_do_open_reclaim(ctx, state); 2244 put_nfs_open_context(ctx); 2245 return ret; 2246 } 2247 2248 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) 2249 { 2250 switch (err) { 2251 default: 2252 printk(KERN_ERR "NFS: %s: unhandled error " 2253 "%d.\n", __func__, err); 2254 fallthrough; 2255 case 0: 2256 case -ENOENT: 2257 case -EAGAIN: 2258 case -ESTALE: 2259 case -ETIMEDOUT: 2260 break; 2261 case -NFS4ERR_BADSESSION: 2262 case -NFS4ERR_BADSLOT: 2263 case -NFS4ERR_BAD_HIGH_SLOT: 2264 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2265 case -NFS4ERR_DEADSESSION: 2266 return -EAGAIN; 2267 case -NFS4ERR_STALE_CLIENTID: 2268 case -NFS4ERR_STALE_STATEID: 2269 /* Don't recall a delegation if it was lost */ 2270 nfs4_schedule_lease_recovery(server->nfs_client); 2271 return -EAGAIN; 2272 case -NFS4ERR_MOVED: 2273 nfs4_schedule_migration_recovery(server); 2274 return -EAGAIN; 2275 case -NFS4ERR_LEASE_MOVED: 2276 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2277 return -EAGAIN; 2278 case -NFS4ERR_DELEG_REVOKED: 2279 case -NFS4ERR_ADMIN_REVOKED: 2280 case -NFS4ERR_EXPIRED: 2281 case -NFS4ERR_BAD_STATEID: 2282 case -NFS4ERR_OPENMODE: 2283 nfs_inode_find_state_and_recover(state->inode, 2284 stateid); 2285 nfs4_schedule_stateid_recovery(server, state); 2286 return -EAGAIN; 2287 case -NFS4ERR_DELAY: 2288 case -NFS4ERR_GRACE: 2289 ssleep(1); 2290 return -EAGAIN; 2291 case -ENOMEM: 2292 case -NFS4ERR_DENIED: 2293 if (fl) { 2294 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2295 if (lsp) 2296 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2297 } 2298 return 0; 2299 } 2300 return err; 2301 } 2302 2303 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2304 struct nfs4_state *state, const nfs4_stateid *stateid) 2305 { 2306 struct nfs_server *server = NFS_SERVER(state->inode); 2307 struct nfs4_opendata *opendata; 2308 int err = 0; 2309 2310 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2311 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2312 if (IS_ERR(opendata)) 2313 return PTR_ERR(opendata); 2314 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2315 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2316 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2317 if (err) 2318 goto out; 2319 } 2320 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2321 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2322 if (err) 2323 goto out; 2324 } 2325 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2326 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2327 if (err) 2328 goto out; 2329 } 2330 nfs_state_clear_delegation(state); 2331 out: 2332 nfs4_opendata_put(opendata); 2333 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2334 } 2335 2336 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2337 { 2338 struct nfs4_opendata *data = calldata; 2339 2340 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2341 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2342 } 2343 2344 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2345 { 2346 struct nfs4_opendata *data = calldata; 2347 2348 nfs40_sequence_done(task, &data->c_res.seq_res); 2349 2350 data->rpc_status = task->tk_status; 2351 if (data->rpc_status == 0) { 2352 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2353 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2354 renew_lease(data->o_res.server, data->timestamp); 2355 data->rpc_done = true; 2356 } 2357 } 2358 2359 static void nfs4_open_confirm_release(void *calldata) 2360 { 2361 struct nfs4_opendata *data = calldata; 2362 struct nfs4_state *state = NULL; 2363 2364 /* If this request hasn't been cancelled, do nothing */ 2365 if (!data->cancelled) 2366 goto out_free; 2367 /* In case of error, no cleanup! */ 2368 if (!data->rpc_done) 2369 goto out_free; 2370 state = nfs4_opendata_to_nfs4_state(data); 2371 if (!IS_ERR(state)) 2372 nfs4_close_state(state, data->o_arg.fmode); 2373 out_free: 2374 nfs4_opendata_put(data); 2375 } 2376 2377 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2378 .rpc_call_prepare = nfs4_open_confirm_prepare, 2379 .rpc_call_done = nfs4_open_confirm_done, 2380 .rpc_release = nfs4_open_confirm_release, 2381 }; 2382 2383 /* 2384 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2385 */ 2386 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2387 { 2388 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2389 struct rpc_task *task; 2390 struct rpc_message msg = { 2391 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2392 .rpc_argp = &data->c_arg, 2393 .rpc_resp = &data->c_res, 2394 .rpc_cred = data->owner->so_cred, 2395 }; 2396 struct rpc_task_setup task_setup_data = { 2397 .rpc_client = server->client, 2398 .rpc_message = &msg, 2399 .callback_ops = &nfs4_open_confirm_ops, 2400 .callback_data = data, 2401 .workqueue = nfsiod_workqueue, 2402 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2403 }; 2404 int status; 2405 2406 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2407 data->is_recover); 2408 kref_get(&data->kref); 2409 data->rpc_done = false; 2410 data->rpc_status = 0; 2411 data->timestamp = jiffies; 2412 task = rpc_run_task(&task_setup_data); 2413 if (IS_ERR(task)) 2414 return PTR_ERR(task); 2415 status = rpc_wait_for_completion_task(task); 2416 if (status != 0) { 2417 data->cancelled = true; 2418 smp_wmb(); 2419 } else 2420 status = data->rpc_status; 2421 rpc_put_task(task); 2422 return status; 2423 } 2424 2425 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2426 { 2427 struct nfs4_opendata *data = calldata; 2428 struct nfs4_state_owner *sp = data->owner; 2429 struct nfs_client *clp = sp->so_server->nfs_client; 2430 enum open_claim_type4 claim = data->o_arg.claim; 2431 2432 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2433 goto out_wait; 2434 /* 2435 * Check if we still need to send an OPEN call, or if we can use 2436 * a delegation instead. 2437 */ 2438 if (data->state != NULL) { 2439 struct nfs_delegation *delegation; 2440 2441 if (can_open_cached(data->state, data->o_arg.fmode, 2442 data->o_arg.open_flags, claim)) 2443 goto out_no_action; 2444 rcu_read_lock(); 2445 delegation = nfs4_get_valid_delegation(data->state->inode); 2446 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2447 goto unlock_no_action; 2448 rcu_read_unlock(); 2449 } 2450 /* Update client id. */ 2451 data->o_arg.clientid = clp->cl_clientid; 2452 switch (claim) { 2453 default: 2454 break; 2455 case NFS4_OPEN_CLAIM_PREVIOUS: 2456 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2457 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2458 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2459 fallthrough; 2460 case NFS4_OPEN_CLAIM_FH: 2461 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2462 } 2463 data->timestamp = jiffies; 2464 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2465 &data->o_arg.seq_args, 2466 &data->o_res.seq_res, 2467 task) != 0) 2468 nfs_release_seqid(data->o_arg.seqid); 2469 2470 /* Set the create mode (note dependency on the session type) */ 2471 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2472 if (data->o_arg.open_flags & O_EXCL) { 2473 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2474 if (clp->cl_mvops->minor_version == 0) { 2475 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2476 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2477 * because ACCESS will return permission denied for 2478 * all bits until close */ 2479 data->o_res.access_request = data->o_arg.access = 0; 2480 } else if (nfs4_has_persistent_session(clp)) 2481 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2482 } 2483 return; 2484 unlock_no_action: 2485 trace_nfs4_cached_open(data->state); 2486 rcu_read_unlock(); 2487 out_no_action: 2488 task->tk_action = NULL; 2489 out_wait: 2490 nfs4_sequence_done(task, &data->o_res.seq_res); 2491 } 2492 2493 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2494 { 2495 struct nfs4_opendata *data = calldata; 2496 2497 data->rpc_status = task->tk_status; 2498 2499 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2500 return; 2501 2502 if (task->tk_status == 0) { 2503 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2504 switch (data->o_res.f_attr->mode & S_IFMT) { 2505 case S_IFREG: 2506 break; 2507 case S_IFLNK: 2508 data->rpc_status = -ELOOP; 2509 break; 2510 case S_IFDIR: 2511 data->rpc_status = -EISDIR; 2512 break; 2513 default: 2514 data->rpc_status = -ENOTDIR; 2515 } 2516 } 2517 renew_lease(data->o_res.server, data->timestamp); 2518 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2519 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2520 } 2521 data->rpc_done = true; 2522 } 2523 2524 static void nfs4_open_release(void *calldata) 2525 { 2526 struct nfs4_opendata *data = calldata; 2527 struct nfs4_state *state = NULL; 2528 2529 /* If this request hasn't been cancelled, do nothing */ 2530 if (!data->cancelled) 2531 goto out_free; 2532 /* In case of error, no cleanup! */ 2533 if (data->rpc_status != 0 || !data->rpc_done) 2534 goto out_free; 2535 /* In case we need an open_confirm, no cleanup! */ 2536 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2537 goto out_free; 2538 state = nfs4_opendata_to_nfs4_state(data); 2539 if (!IS_ERR(state)) 2540 nfs4_close_state(state, data->o_arg.fmode); 2541 out_free: 2542 nfs4_opendata_put(data); 2543 } 2544 2545 static const struct rpc_call_ops nfs4_open_ops = { 2546 .rpc_call_prepare = nfs4_open_prepare, 2547 .rpc_call_done = nfs4_open_done, 2548 .rpc_release = nfs4_open_release, 2549 }; 2550 2551 static int nfs4_run_open_task(struct nfs4_opendata *data, 2552 struct nfs_open_context *ctx) 2553 { 2554 struct inode *dir = d_inode(data->dir); 2555 struct nfs_server *server = NFS_SERVER(dir); 2556 struct nfs_openargs *o_arg = &data->o_arg; 2557 struct nfs_openres *o_res = &data->o_res; 2558 struct rpc_task *task; 2559 struct rpc_message msg = { 2560 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2561 .rpc_argp = o_arg, 2562 .rpc_resp = o_res, 2563 .rpc_cred = data->owner->so_cred, 2564 }; 2565 struct rpc_task_setup task_setup_data = { 2566 .rpc_client = server->client, 2567 .rpc_message = &msg, 2568 .callback_ops = &nfs4_open_ops, 2569 .callback_data = data, 2570 .workqueue = nfsiod_workqueue, 2571 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2572 }; 2573 int status; 2574 2575 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2576 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2577 2578 kref_get(&data->kref); 2579 data->rpc_done = false; 2580 data->rpc_status = 0; 2581 data->cancelled = false; 2582 data->is_recover = false; 2583 if (!ctx) { 2584 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2585 data->is_recover = true; 2586 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2587 } else { 2588 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2589 pnfs_lgopen_prepare(data, ctx); 2590 } 2591 task = rpc_run_task(&task_setup_data); 2592 if (IS_ERR(task)) 2593 return PTR_ERR(task); 2594 status = rpc_wait_for_completion_task(task); 2595 if (status != 0) { 2596 data->cancelled = true; 2597 smp_wmb(); 2598 } else 2599 status = data->rpc_status; 2600 rpc_put_task(task); 2601 2602 return status; 2603 } 2604 2605 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2606 { 2607 struct inode *dir = d_inode(data->dir); 2608 struct nfs_openres *o_res = &data->o_res; 2609 int status; 2610 2611 status = nfs4_run_open_task(data, NULL); 2612 if (status != 0 || !data->rpc_done) 2613 return status; 2614 2615 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2616 2617 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2618 status = _nfs4_proc_open_confirm(data); 2619 2620 return status; 2621 } 2622 2623 /* 2624 * Additional permission checks in order to distinguish between an 2625 * open for read, and an open for execute. This works around the 2626 * fact that NFSv4 OPEN treats read and execute permissions as being 2627 * the same. 2628 * Note that in the non-execute case, we want to turn off permission 2629 * checking if we just created a new file (POSIX open() semantics). 2630 */ 2631 static int nfs4_opendata_access(const struct cred *cred, 2632 struct nfs4_opendata *opendata, 2633 struct nfs4_state *state, fmode_t fmode) 2634 { 2635 struct nfs_access_entry cache; 2636 u32 mask, flags; 2637 2638 /* access call failed or for some reason the server doesn't 2639 * support any access modes -- defer access call until later */ 2640 if (opendata->o_res.access_supported == 0) 2641 return 0; 2642 2643 mask = 0; 2644 if (fmode & FMODE_EXEC) { 2645 /* ONLY check for exec rights */ 2646 if (S_ISDIR(state->inode->i_mode)) 2647 mask = NFS4_ACCESS_LOOKUP; 2648 else 2649 mask = NFS4_ACCESS_EXECUTE; 2650 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2651 mask = NFS4_ACCESS_READ; 2652 2653 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2654 nfs_access_add_cache(state->inode, &cache, cred); 2655 2656 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2657 if ((mask & ~cache.mask & flags) == 0) 2658 return 0; 2659 2660 return -EACCES; 2661 } 2662 2663 /* 2664 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2665 */ 2666 static int _nfs4_proc_open(struct nfs4_opendata *data, 2667 struct nfs_open_context *ctx) 2668 { 2669 struct inode *dir = d_inode(data->dir); 2670 struct nfs_server *server = NFS_SERVER(dir); 2671 struct nfs_openargs *o_arg = &data->o_arg; 2672 struct nfs_openres *o_res = &data->o_res; 2673 int status; 2674 2675 status = nfs4_run_open_task(data, ctx); 2676 if (!data->rpc_done) 2677 return status; 2678 if (status != 0) { 2679 if (status == -NFS4ERR_BADNAME && 2680 !(o_arg->open_flags & O_CREAT)) 2681 return -ENOENT; 2682 return status; 2683 } 2684 2685 nfs_fattr_map_and_free_names(server, &data->f_attr); 2686 2687 if (o_arg->open_flags & O_CREAT) { 2688 if (o_arg->open_flags & O_EXCL) 2689 data->file_created = true; 2690 else if (o_res->cinfo.before != o_res->cinfo.after) 2691 data->file_created = true; 2692 if (data->file_created || 2693 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2694 nfs4_update_changeattr(dir, &o_res->cinfo, 2695 o_res->f_attr->time_start, 2696 NFS_INO_INVALID_DATA); 2697 } 2698 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2699 server->caps &= ~NFS_CAP_POSIX_LOCK; 2700 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2701 status = _nfs4_proc_open_confirm(data); 2702 if (status != 0) 2703 return status; 2704 } 2705 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2706 nfs4_sequence_free_slot(&o_res->seq_res); 2707 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL); 2708 } 2709 return 0; 2710 } 2711 2712 /* 2713 * OPEN_EXPIRED: 2714 * reclaim state on the server after a network partition. 2715 * Assumes caller holds the appropriate lock 2716 */ 2717 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2718 { 2719 struct nfs4_opendata *opendata; 2720 int ret; 2721 2722 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2723 if (IS_ERR(opendata)) 2724 return PTR_ERR(opendata); 2725 /* 2726 * We're not recovering a delegation, so ask for no delegation. 2727 * Otherwise the recovery thread could deadlock with an outstanding 2728 * delegation return. 2729 */ 2730 opendata->o_arg.open_flags = O_DIRECT; 2731 ret = nfs4_open_recover(opendata, state); 2732 if (ret == -ESTALE) 2733 d_drop(ctx->dentry); 2734 nfs4_opendata_put(opendata); 2735 return ret; 2736 } 2737 2738 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2739 { 2740 struct nfs_server *server = NFS_SERVER(state->inode); 2741 struct nfs4_exception exception = { }; 2742 int err; 2743 2744 do { 2745 err = _nfs4_open_expired(ctx, state); 2746 trace_nfs4_open_expired(ctx, 0, err); 2747 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2748 continue; 2749 switch (err) { 2750 default: 2751 goto out; 2752 case -NFS4ERR_GRACE: 2753 case -NFS4ERR_DELAY: 2754 nfs4_handle_exception(server, err, &exception); 2755 err = 0; 2756 } 2757 } while (exception.retry); 2758 out: 2759 return err; 2760 } 2761 2762 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2763 { 2764 struct nfs_open_context *ctx; 2765 int ret; 2766 2767 ctx = nfs4_state_find_open_context(state); 2768 if (IS_ERR(ctx)) 2769 return -EAGAIN; 2770 ret = nfs4_do_open_expired(ctx, state); 2771 put_nfs_open_context(ctx); 2772 return ret; 2773 } 2774 2775 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2776 const nfs4_stateid *stateid) 2777 { 2778 nfs_remove_bad_delegation(state->inode, stateid); 2779 nfs_state_clear_delegation(state); 2780 } 2781 2782 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2783 { 2784 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2785 nfs_finish_clear_delegation_stateid(state, NULL); 2786 } 2787 2788 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2789 { 2790 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2791 nfs40_clear_delegation_stateid(state); 2792 nfs_state_clear_open_state_flags(state); 2793 return nfs4_open_expired(sp, state); 2794 } 2795 2796 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2797 nfs4_stateid *stateid, 2798 const struct cred *cred) 2799 { 2800 return -NFS4ERR_BAD_STATEID; 2801 } 2802 2803 #if defined(CONFIG_NFS_V4_1) 2804 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2805 nfs4_stateid *stateid, 2806 const struct cred *cred) 2807 { 2808 int status; 2809 2810 switch (stateid->type) { 2811 default: 2812 break; 2813 case NFS4_INVALID_STATEID_TYPE: 2814 case NFS4_SPECIAL_STATEID_TYPE: 2815 return -NFS4ERR_BAD_STATEID; 2816 case NFS4_REVOKED_STATEID_TYPE: 2817 goto out_free; 2818 } 2819 2820 status = nfs41_test_stateid(server, stateid, cred); 2821 switch (status) { 2822 case -NFS4ERR_EXPIRED: 2823 case -NFS4ERR_ADMIN_REVOKED: 2824 case -NFS4ERR_DELEG_REVOKED: 2825 break; 2826 default: 2827 return status; 2828 } 2829 out_free: 2830 /* Ack the revoked state to the server */ 2831 nfs41_free_stateid(server, stateid, cred, true); 2832 return -NFS4ERR_EXPIRED; 2833 } 2834 2835 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2836 { 2837 struct nfs_server *server = NFS_SERVER(state->inode); 2838 nfs4_stateid stateid; 2839 struct nfs_delegation *delegation; 2840 const struct cred *cred = NULL; 2841 int status, ret = NFS_OK; 2842 2843 /* Get the delegation credential for use by test/free_stateid */ 2844 rcu_read_lock(); 2845 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2846 if (delegation == NULL) { 2847 rcu_read_unlock(); 2848 nfs_state_clear_delegation(state); 2849 return NFS_OK; 2850 } 2851 2852 spin_lock(&delegation->lock); 2853 nfs4_stateid_copy(&stateid, &delegation->stateid); 2854 2855 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2856 &delegation->flags)) { 2857 spin_unlock(&delegation->lock); 2858 rcu_read_unlock(); 2859 return NFS_OK; 2860 } 2861 2862 if (delegation->cred) 2863 cred = get_cred(delegation->cred); 2864 spin_unlock(&delegation->lock); 2865 rcu_read_unlock(); 2866 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2867 trace_nfs4_test_delegation_stateid(state, NULL, status); 2868 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2869 nfs_finish_clear_delegation_stateid(state, &stateid); 2870 else 2871 ret = status; 2872 2873 put_cred(cred); 2874 return ret; 2875 } 2876 2877 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2878 { 2879 nfs4_stateid tmp; 2880 2881 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2882 nfs4_copy_delegation_stateid(state->inode, state->state, 2883 &tmp, NULL) && 2884 nfs4_stateid_match_other(&state->stateid, &tmp)) 2885 nfs_state_set_delegation(state, &tmp, state->state); 2886 else 2887 nfs_state_clear_delegation(state); 2888 } 2889 2890 /** 2891 * nfs41_check_expired_locks - possibly free a lock stateid 2892 * 2893 * @state: NFSv4 state for an inode 2894 * 2895 * Returns NFS_OK if recovery for this stateid is now finished. 2896 * Otherwise a negative NFS4ERR value is returned. 2897 */ 2898 static int nfs41_check_expired_locks(struct nfs4_state *state) 2899 { 2900 int status, ret = NFS_OK; 2901 struct nfs4_lock_state *lsp, *prev = NULL; 2902 struct nfs_server *server = NFS_SERVER(state->inode); 2903 2904 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2905 goto out; 2906 2907 spin_lock(&state->state_lock); 2908 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2909 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2910 const struct cred *cred = lsp->ls_state->owner->so_cred; 2911 2912 refcount_inc(&lsp->ls_count); 2913 spin_unlock(&state->state_lock); 2914 2915 nfs4_put_lock_state(prev); 2916 prev = lsp; 2917 2918 status = nfs41_test_and_free_expired_stateid(server, 2919 &lsp->ls_stateid, 2920 cred); 2921 trace_nfs4_test_lock_stateid(state, lsp, status); 2922 if (status == -NFS4ERR_EXPIRED || 2923 status == -NFS4ERR_BAD_STATEID) { 2924 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2925 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2926 if (!recover_lost_locks) 2927 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2928 } else if (status != NFS_OK) { 2929 ret = status; 2930 nfs4_put_lock_state(prev); 2931 goto out; 2932 } 2933 spin_lock(&state->state_lock); 2934 } 2935 } 2936 spin_unlock(&state->state_lock); 2937 nfs4_put_lock_state(prev); 2938 out: 2939 return ret; 2940 } 2941 2942 /** 2943 * nfs41_check_open_stateid - possibly free an open stateid 2944 * 2945 * @state: NFSv4 state for an inode 2946 * 2947 * Returns NFS_OK if recovery for this stateid is now finished. 2948 * Otherwise a negative NFS4ERR value is returned. 2949 */ 2950 static int nfs41_check_open_stateid(struct nfs4_state *state) 2951 { 2952 struct nfs_server *server = NFS_SERVER(state->inode); 2953 nfs4_stateid *stateid = &state->open_stateid; 2954 const struct cred *cred = state->owner->so_cred; 2955 int status; 2956 2957 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2958 return -NFS4ERR_BAD_STATEID; 2959 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2960 trace_nfs4_test_open_stateid(state, NULL, status); 2961 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2962 nfs_state_clear_open_state_flags(state); 2963 stateid->type = NFS4_INVALID_STATEID_TYPE; 2964 return status; 2965 } 2966 if (nfs_open_stateid_recover_openmode(state)) 2967 return -NFS4ERR_OPENMODE; 2968 return NFS_OK; 2969 } 2970 2971 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2972 { 2973 int status; 2974 2975 status = nfs41_check_delegation_stateid(state); 2976 if (status != NFS_OK) 2977 return status; 2978 nfs41_delegation_recover_stateid(state); 2979 2980 status = nfs41_check_expired_locks(state); 2981 if (status != NFS_OK) 2982 return status; 2983 status = nfs41_check_open_stateid(state); 2984 if (status != NFS_OK) 2985 status = nfs4_open_expired(sp, state); 2986 return status; 2987 } 2988 #endif 2989 2990 /* 2991 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2992 * fields corresponding to attributes that were used to store the verifier. 2993 * Make sure we clobber those fields in the later setattr call 2994 */ 2995 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2996 struct iattr *sattr, struct nfs4_label **label) 2997 { 2998 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2999 __u32 attrset[3]; 3000 unsigned ret; 3001 unsigned i; 3002 3003 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3004 attrset[i] = opendata->o_res.attrset[i]; 3005 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3006 attrset[i] &= ~bitmask[i]; 3007 } 3008 3009 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3010 sattr->ia_valid : 0; 3011 3012 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3013 if (sattr->ia_valid & ATTR_ATIME_SET) 3014 ret |= ATTR_ATIME_SET; 3015 else 3016 ret |= ATTR_ATIME; 3017 } 3018 3019 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3020 if (sattr->ia_valid & ATTR_MTIME_SET) 3021 ret |= ATTR_MTIME_SET; 3022 else 3023 ret |= ATTR_MTIME; 3024 } 3025 3026 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3027 *label = NULL; 3028 return ret; 3029 } 3030 3031 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3032 struct nfs_open_context *ctx) 3033 { 3034 struct nfs4_state_owner *sp = opendata->owner; 3035 struct nfs_server *server = sp->so_server; 3036 struct dentry *dentry; 3037 struct nfs4_state *state; 3038 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3039 struct inode *dir = d_inode(opendata->dir); 3040 unsigned long dir_verifier; 3041 unsigned int seq; 3042 int ret; 3043 3044 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3045 dir_verifier = nfs_save_change_attribute(dir); 3046 3047 ret = _nfs4_proc_open(opendata, ctx); 3048 if (ret != 0) 3049 goto out; 3050 3051 state = _nfs4_opendata_to_nfs4_state(opendata); 3052 ret = PTR_ERR(state); 3053 if (IS_ERR(state)) 3054 goto out; 3055 ctx->state = state; 3056 if (server->caps & NFS_CAP_POSIX_LOCK) 3057 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3058 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3059 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3060 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3061 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3062 3063 dentry = opendata->dentry; 3064 if (d_really_is_negative(dentry)) { 3065 struct dentry *alias; 3066 d_drop(dentry); 3067 alias = d_exact_alias(dentry, state->inode); 3068 if (!alias) 3069 alias = d_splice_alias(igrab(state->inode), dentry); 3070 /* d_splice_alias() can't fail here - it's a non-directory */ 3071 if (alias) { 3072 dput(ctx->dentry); 3073 ctx->dentry = dentry = alias; 3074 } 3075 } 3076 3077 switch(opendata->o_arg.claim) { 3078 default: 3079 break; 3080 case NFS4_OPEN_CLAIM_NULL: 3081 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3082 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3083 if (!opendata->rpc_done) 3084 break; 3085 if (opendata->o_res.delegation_type != 0) 3086 dir_verifier = nfs_save_change_attribute(dir); 3087 nfs_set_verifier(dentry, dir_verifier); 3088 } 3089 3090 /* Parse layoutget results before we check for access */ 3091 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3092 3093 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3094 if (ret != 0) 3095 goto out; 3096 3097 if (d_inode(dentry) == state->inode) { 3098 nfs_inode_attach_open_context(ctx); 3099 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3100 nfs4_schedule_stateid_recovery(server, state); 3101 } 3102 3103 out: 3104 if (!opendata->cancelled) { 3105 if (opendata->lgp) { 3106 nfs4_lgopen_release(opendata->lgp); 3107 opendata->lgp = NULL; 3108 } 3109 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3110 } 3111 return ret; 3112 } 3113 3114 /* 3115 * Returns a referenced nfs4_state 3116 */ 3117 static int _nfs4_do_open(struct inode *dir, 3118 struct nfs_open_context *ctx, 3119 int flags, 3120 const struct nfs4_open_createattrs *c, 3121 int *opened) 3122 { 3123 struct nfs4_state_owner *sp; 3124 struct nfs4_state *state = NULL; 3125 struct nfs_server *server = NFS_SERVER(dir); 3126 struct nfs4_opendata *opendata; 3127 struct dentry *dentry = ctx->dentry; 3128 const struct cred *cred = ctx->cred; 3129 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3130 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3131 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3132 struct iattr *sattr = c->sattr; 3133 struct nfs4_label *label = c->label; 3134 int status; 3135 3136 /* Protect against reboot recovery conflicts */ 3137 status = -ENOMEM; 3138 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3139 if (sp == NULL) { 3140 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3141 goto out_err; 3142 } 3143 status = nfs4_client_recover_expired_lease(server->nfs_client); 3144 if (status != 0) 3145 goto err_put_state_owner; 3146 if (d_really_is_positive(dentry)) 3147 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3148 status = -ENOMEM; 3149 if (d_really_is_positive(dentry)) 3150 claim = NFS4_OPEN_CLAIM_FH; 3151 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3152 c, claim, GFP_KERNEL); 3153 if (opendata == NULL) 3154 goto err_put_state_owner; 3155 3156 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3157 if (!opendata->f_attr.mdsthreshold) { 3158 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3159 if (!opendata->f_attr.mdsthreshold) 3160 goto err_opendata_put; 3161 } 3162 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3163 } 3164 if (d_really_is_positive(dentry)) 3165 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3166 3167 status = _nfs4_open_and_get_state(opendata, ctx); 3168 if (status != 0) 3169 goto err_opendata_put; 3170 state = ctx->state; 3171 3172 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3173 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3174 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3175 /* 3176 * send create attributes which was not set by open 3177 * with an extra setattr. 3178 */ 3179 if (attrs || label) { 3180 unsigned ia_old = sattr->ia_valid; 3181 3182 sattr->ia_valid = attrs; 3183 nfs_fattr_init(opendata->o_res.f_attr); 3184 status = nfs4_do_setattr(state->inode, cred, 3185 opendata->o_res.f_attr, sattr, 3186 ctx, label); 3187 if (status == 0) { 3188 nfs_setattr_update_inode(state->inode, sattr, 3189 opendata->o_res.f_attr); 3190 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3191 } 3192 sattr->ia_valid = ia_old; 3193 } 3194 } 3195 if (opened && opendata->file_created) 3196 *opened = 1; 3197 3198 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3199 *ctx_th = opendata->f_attr.mdsthreshold; 3200 opendata->f_attr.mdsthreshold = NULL; 3201 } 3202 3203 nfs4_opendata_put(opendata); 3204 nfs4_put_state_owner(sp); 3205 return 0; 3206 err_opendata_put: 3207 nfs4_opendata_put(opendata); 3208 err_put_state_owner: 3209 nfs4_put_state_owner(sp); 3210 out_err: 3211 return status; 3212 } 3213 3214 3215 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3216 struct nfs_open_context *ctx, 3217 int flags, 3218 struct iattr *sattr, 3219 struct nfs4_label *label, 3220 int *opened) 3221 { 3222 struct nfs_server *server = NFS_SERVER(dir); 3223 struct nfs4_exception exception = { 3224 .interruptible = true, 3225 }; 3226 struct nfs4_state *res; 3227 struct nfs4_open_createattrs c = { 3228 .label = label, 3229 .sattr = sattr, 3230 .verf = { 3231 [0] = (__u32)jiffies, 3232 [1] = (__u32)current->pid, 3233 }, 3234 }; 3235 int status; 3236 3237 do { 3238 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3239 res = ctx->state; 3240 trace_nfs4_open_file(ctx, flags, status); 3241 if (status == 0) 3242 break; 3243 /* NOTE: BAD_SEQID means the server and client disagree about the 3244 * book-keeping w.r.t. state-changing operations 3245 * (OPEN/CLOSE/LOCK/LOCKU...) 3246 * It is actually a sign of a bug on the client or on the server. 3247 * 3248 * If we receive a BAD_SEQID error in the particular case of 3249 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3250 * have unhashed the old state_owner for us, and that we can 3251 * therefore safely retry using a new one. We should still warn 3252 * the user though... 3253 */ 3254 if (status == -NFS4ERR_BAD_SEQID) { 3255 pr_warn_ratelimited("NFS: v4 server %s " 3256 " returned a bad sequence-id error!\n", 3257 NFS_SERVER(dir)->nfs_client->cl_hostname); 3258 exception.retry = 1; 3259 continue; 3260 } 3261 /* 3262 * BAD_STATEID on OPEN means that the server cancelled our 3263 * state before it received the OPEN_CONFIRM. 3264 * Recover by retrying the request as per the discussion 3265 * on Page 181 of RFC3530. 3266 */ 3267 if (status == -NFS4ERR_BAD_STATEID) { 3268 exception.retry = 1; 3269 continue; 3270 } 3271 if (status == -NFS4ERR_EXPIRED) { 3272 nfs4_schedule_lease_recovery(server->nfs_client); 3273 exception.retry = 1; 3274 continue; 3275 } 3276 if (status == -EAGAIN) { 3277 /* We must have found a delegation */ 3278 exception.retry = 1; 3279 continue; 3280 } 3281 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3282 continue; 3283 res = ERR_PTR(nfs4_handle_exception(server, 3284 status, &exception)); 3285 } while (exception.retry); 3286 return res; 3287 } 3288 3289 static int _nfs4_do_setattr(struct inode *inode, 3290 struct nfs_setattrargs *arg, 3291 struct nfs_setattrres *res, 3292 const struct cred *cred, 3293 struct nfs_open_context *ctx) 3294 { 3295 struct nfs_server *server = NFS_SERVER(inode); 3296 struct rpc_message msg = { 3297 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3298 .rpc_argp = arg, 3299 .rpc_resp = res, 3300 .rpc_cred = cred, 3301 }; 3302 const struct cred *delegation_cred = NULL; 3303 unsigned long timestamp = jiffies; 3304 bool truncate; 3305 int status; 3306 3307 nfs_fattr_init(res->fattr); 3308 3309 /* Servers should only apply open mode checks for file size changes */ 3310 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3311 if (!truncate) { 3312 nfs4_inode_make_writeable(inode); 3313 goto zero_stateid; 3314 } 3315 3316 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3317 /* Use that stateid */ 3318 } else if (ctx != NULL && ctx->state) { 3319 struct nfs_lock_context *l_ctx; 3320 if (!nfs4_valid_open_stateid(ctx->state)) 3321 return -EBADF; 3322 l_ctx = nfs_get_lock_context(ctx); 3323 if (IS_ERR(l_ctx)) 3324 return PTR_ERR(l_ctx); 3325 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3326 &arg->stateid, &delegation_cred); 3327 nfs_put_lock_context(l_ctx); 3328 if (status == -EIO) 3329 return -EBADF; 3330 else if (status == -EAGAIN) 3331 goto zero_stateid; 3332 } else { 3333 zero_stateid: 3334 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3335 } 3336 if (delegation_cred) 3337 msg.rpc_cred = delegation_cred; 3338 3339 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3340 3341 put_cred(delegation_cred); 3342 if (status == 0 && ctx != NULL) 3343 renew_lease(server, timestamp); 3344 trace_nfs4_setattr(inode, &arg->stateid, status); 3345 return status; 3346 } 3347 3348 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3349 struct nfs_fattr *fattr, struct iattr *sattr, 3350 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3351 { 3352 struct nfs_server *server = NFS_SERVER(inode); 3353 __u32 bitmask[NFS4_BITMASK_SZ]; 3354 struct nfs4_state *state = ctx ? ctx->state : NULL; 3355 struct nfs_setattrargs arg = { 3356 .fh = NFS_FH(inode), 3357 .iap = sattr, 3358 .server = server, 3359 .bitmask = bitmask, 3360 .label = ilabel, 3361 }; 3362 struct nfs_setattrres res = { 3363 .fattr = fattr, 3364 .server = server, 3365 }; 3366 struct nfs4_exception exception = { 3367 .state = state, 3368 .inode = inode, 3369 .stateid = &arg.stateid, 3370 }; 3371 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3372 int err; 3373 3374 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3375 adjust_flags |= NFS_INO_INVALID_MODE; 3376 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3377 adjust_flags |= NFS_INO_INVALID_OTHER; 3378 3379 do { 3380 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3381 inode, adjust_flags); 3382 3383 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3384 switch (err) { 3385 case -NFS4ERR_OPENMODE: 3386 if (!(sattr->ia_valid & ATTR_SIZE)) { 3387 pr_warn_once("NFSv4: server %s is incorrectly " 3388 "applying open mode checks to " 3389 "a SETATTR that is not " 3390 "changing file size.\n", 3391 server->nfs_client->cl_hostname); 3392 } 3393 if (state && !(state->state & FMODE_WRITE)) { 3394 err = -EBADF; 3395 if (sattr->ia_valid & ATTR_OPEN) 3396 err = -EACCES; 3397 goto out; 3398 } 3399 } 3400 err = nfs4_handle_exception(server, err, &exception); 3401 } while (exception.retry); 3402 out: 3403 return err; 3404 } 3405 3406 static bool 3407 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3408 { 3409 if (inode == NULL || !nfs_have_layout(inode)) 3410 return false; 3411 3412 return pnfs_wait_on_layoutreturn(inode, task); 3413 } 3414 3415 /* 3416 * Update the seqid of an open stateid 3417 */ 3418 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3419 struct nfs4_state *state) 3420 { 3421 __be32 seqid_open; 3422 u32 dst_seqid; 3423 int seq; 3424 3425 for (;;) { 3426 if (!nfs4_valid_open_stateid(state)) 3427 break; 3428 seq = read_seqbegin(&state->seqlock); 3429 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3430 nfs4_stateid_copy(dst, &state->open_stateid); 3431 if (read_seqretry(&state->seqlock, seq)) 3432 continue; 3433 break; 3434 } 3435 seqid_open = state->open_stateid.seqid; 3436 if (read_seqretry(&state->seqlock, seq)) 3437 continue; 3438 3439 dst_seqid = be32_to_cpu(dst->seqid); 3440 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3441 dst->seqid = seqid_open; 3442 break; 3443 } 3444 } 3445 3446 /* 3447 * Update the seqid of an open stateid after receiving 3448 * NFS4ERR_OLD_STATEID 3449 */ 3450 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3451 struct nfs4_state *state) 3452 { 3453 __be32 seqid_open; 3454 u32 dst_seqid; 3455 bool ret; 3456 int seq, status = -EAGAIN; 3457 DEFINE_WAIT(wait); 3458 3459 for (;;) { 3460 ret = false; 3461 if (!nfs4_valid_open_stateid(state)) 3462 break; 3463 seq = read_seqbegin(&state->seqlock); 3464 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3465 if (read_seqretry(&state->seqlock, seq)) 3466 continue; 3467 break; 3468 } 3469 3470 write_seqlock(&state->seqlock); 3471 seqid_open = state->open_stateid.seqid; 3472 3473 dst_seqid = be32_to_cpu(dst->seqid); 3474 3475 /* Did another OPEN bump the state's seqid? try again: */ 3476 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3477 dst->seqid = seqid_open; 3478 write_sequnlock(&state->seqlock); 3479 ret = true; 3480 break; 3481 } 3482 3483 /* server says we're behind but we haven't seen the update yet */ 3484 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3485 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3486 write_sequnlock(&state->seqlock); 3487 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3488 3489 if (fatal_signal_pending(current)) 3490 status = -EINTR; 3491 else 3492 if (schedule_timeout(5*HZ) != 0) 3493 status = 0; 3494 3495 finish_wait(&state->waitq, &wait); 3496 3497 if (!status) 3498 continue; 3499 if (status == -EINTR) 3500 break; 3501 3502 /* we slept the whole 5 seconds, we must have lost a seqid */ 3503 dst->seqid = cpu_to_be32(dst_seqid + 1); 3504 ret = true; 3505 break; 3506 } 3507 3508 return ret; 3509 } 3510 3511 struct nfs4_closedata { 3512 struct inode *inode; 3513 struct nfs4_state *state; 3514 struct nfs_closeargs arg; 3515 struct nfs_closeres res; 3516 struct { 3517 struct nfs4_layoutreturn_args arg; 3518 struct nfs4_layoutreturn_res res; 3519 struct nfs4_xdr_opaque_data ld_private; 3520 u32 roc_barrier; 3521 bool roc; 3522 } lr; 3523 struct nfs_fattr fattr; 3524 unsigned long timestamp; 3525 }; 3526 3527 static void nfs4_free_closedata(void *data) 3528 { 3529 struct nfs4_closedata *calldata = data; 3530 struct nfs4_state_owner *sp = calldata->state->owner; 3531 struct super_block *sb = calldata->state->inode->i_sb; 3532 3533 if (calldata->lr.roc) 3534 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3535 calldata->res.lr_ret); 3536 nfs4_put_open_state(calldata->state); 3537 nfs_free_seqid(calldata->arg.seqid); 3538 nfs4_put_state_owner(sp); 3539 nfs_sb_deactive(sb); 3540 kfree(calldata); 3541 } 3542 3543 static void nfs4_close_done(struct rpc_task *task, void *data) 3544 { 3545 struct nfs4_closedata *calldata = data; 3546 struct nfs4_state *state = calldata->state; 3547 struct nfs_server *server = NFS_SERVER(calldata->inode); 3548 nfs4_stateid *res_stateid = NULL; 3549 struct nfs4_exception exception = { 3550 .state = state, 3551 .inode = calldata->inode, 3552 .stateid = &calldata->arg.stateid, 3553 }; 3554 3555 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3556 return; 3557 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3558 3559 /* Handle Layoutreturn errors */ 3560 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3561 &calldata->res.lr_ret) == -EAGAIN) 3562 goto out_restart; 3563 3564 /* hmm. we are done with the inode, and in the process of freeing 3565 * the state_owner. we keep this around to process errors 3566 */ 3567 switch (task->tk_status) { 3568 case 0: 3569 res_stateid = &calldata->res.stateid; 3570 renew_lease(server, calldata->timestamp); 3571 break; 3572 case -NFS4ERR_ACCESS: 3573 if (calldata->arg.bitmask != NULL) { 3574 calldata->arg.bitmask = NULL; 3575 calldata->res.fattr = NULL; 3576 goto out_restart; 3577 3578 } 3579 break; 3580 case -NFS4ERR_OLD_STATEID: 3581 /* Did we race with OPEN? */ 3582 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3583 state)) 3584 goto out_restart; 3585 goto out_release; 3586 case -NFS4ERR_ADMIN_REVOKED: 3587 case -NFS4ERR_STALE_STATEID: 3588 case -NFS4ERR_EXPIRED: 3589 nfs4_free_revoked_stateid(server, 3590 &calldata->arg.stateid, 3591 task->tk_msg.rpc_cred); 3592 fallthrough; 3593 case -NFS4ERR_BAD_STATEID: 3594 if (calldata->arg.fmode == 0) 3595 break; 3596 fallthrough; 3597 default: 3598 task->tk_status = nfs4_async_handle_exception(task, 3599 server, task->tk_status, &exception); 3600 if (exception.retry) 3601 goto out_restart; 3602 } 3603 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3604 res_stateid, calldata->arg.fmode); 3605 out_release: 3606 task->tk_status = 0; 3607 nfs_release_seqid(calldata->arg.seqid); 3608 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3609 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3610 return; 3611 out_restart: 3612 task->tk_status = 0; 3613 rpc_restart_call_prepare(task); 3614 goto out_release; 3615 } 3616 3617 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3618 { 3619 struct nfs4_closedata *calldata = data; 3620 struct nfs4_state *state = calldata->state; 3621 struct inode *inode = calldata->inode; 3622 struct nfs_server *server = NFS_SERVER(inode); 3623 struct pnfs_layout_hdr *lo; 3624 bool is_rdonly, is_wronly, is_rdwr; 3625 int call_close = 0; 3626 3627 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3628 goto out_wait; 3629 3630 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3631 spin_lock(&state->owner->so_lock); 3632 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3633 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3634 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3635 /* Calculate the change in open mode */ 3636 calldata->arg.fmode = 0; 3637 if (state->n_rdwr == 0) { 3638 if (state->n_rdonly == 0) 3639 call_close |= is_rdonly; 3640 else if (is_rdonly) 3641 calldata->arg.fmode |= FMODE_READ; 3642 if (state->n_wronly == 0) 3643 call_close |= is_wronly; 3644 else if (is_wronly) 3645 calldata->arg.fmode |= FMODE_WRITE; 3646 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3647 call_close |= is_rdwr; 3648 } else if (is_rdwr) 3649 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3650 3651 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3652 if (!nfs4_valid_open_stateid(state)) 3653 call_close = 0; 3654 spin_unlock(&state->owner->so_lock); 3655 3656 if (!call_close) { 3657 /* Note: exit _without_ calling nfs4_close_done */ 3658 goto out_no_action; 3659 } 3660 3661 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3662 nfs_release_seqid(calldata->arg.seqid); 3663 goto out_wait; 3664 } 3665 3666 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3667 if (lo && !pnfs_layout_is_valid(lo)) { 3668 calldata->arg.lr_args = NULL; 3669 calldata->res.lr_res = NULL; 3670 } 3671 3672 if (calldata->arg.fmode == 0) 3673 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3674 3675 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3676 /* Close-to-open cache consistency revalidation */ 3677 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3678 nfs4_bitmask_set(calldata->arg.bitmask_store, 3679 server->cache_consistency_bitmask, 3680 inode, 0); 3681 calldata->arg.bitmask = calldata->arg.bitmask_store; 3682 } else 3683 calldata->arg.bitmask = NULL; 3684 } 3685 3686 calldata->arg.share_access = 3687 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3688 calldata->arg.fmode, 0); 3689 3690 if (calldata->res.fattr == NULL) 3691 calldata->arg.bitmask = NULL; 3692 else if (calldata->arg.bitmask == NULL) 3693 calldata->res.fattr = NULL; 3694 calldata->timestamp = jiffies; 3695 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3696 &calldata->arg.seq_args, 3697 &calldata->res.seq_res, 3698 task) != 0) 3699 nfs_release_seqid(calldata->arg.seqid); 3700 return; 3701 out_no_action: 3702 task->tk_action = NULL; 3703 out_wait: 3704 nfs4_sequence_done(task, &calldata->res.seq_res); 3705 } 3706 3707 static const struct rpc_call_ops nfs4_close_ops = { 3708 .rpc_call_prepare = nfs4_close_prepare, 3709 .rpc_call_done = nfs4_close_done, 3710 .rpc_release = nfs4_free_closedata, 3711 }; 3712 3713 /* 3714 * It is possible for data to be read/written from a mem-mapped file 3715 * after the sys_close call (which hits the vfs layer as a flush). 3716 * This means that we can't safely call nfsv4 close on a file until 3717 * the inode is cleared. This in turn means that we are not good 3718 * NFSv4 citizens - we do not indicate to the server to update the file's 3719 * share state even when we are done with one of the three share 3720 * stateid's in the inode. 3721 * 3722 * NOTE: Caller must be holding the sp->so_owner semaphore! 3723 */ 3724 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3725 { 3726 struct nfs_server *server = NFS_SERVER(state->inode); 3727 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3728 struct nfs4_closedata *calldata; 3729 struct nfs4_state_owner *sp = state->owner; 3730 struct rpc_task *task; 3731 struct rpc_message msg = { 3732 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3733 .rpc_cred = state->owner->so_cred, 3734 }; 3735 struct rpc_task_setup task_setup_data = { 3736 .rpc_client = server->client, 3737 .rpc_message = &msg, 3738 .callback_ops = &nfs4_close_ops, 3739 .workqueue = nfsiod_workqueue, 3740 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3741 }; 3742 int status = -ENOMEM; 3743 3744 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3745 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3746 3747 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3748 &task_setup_data.rpc_client, &msg); 3749 3750 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3751 if (calldata == NULL) 3752 goto out; 3753 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3754 calldata->inode = state->inode; 3755 calldata->state = state; 3756 calldata->arg.fh = NFS_FH(state->inode); 3757 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3758 goto out_free_calldata; 3759 /* Serialization for the sequence id */ 3760 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3761 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3762 if (IS_ERR(calldata->arg.seqid)) 3763 goto out_free_calldata; 3764 nfs_fattr_init(&calldata->fattr); 3765 calldata->arg.fmode = 0; 3766 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3767 calldata->res.fattr = &calldata->fattr; 3768 calldata->res.seqid = calldata->arg.seqid; 3769 calldata->res.server = server; 3770 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3771 calldata->lr.roc = pnfs_roc(state->inode, 3772 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3773 if (calldata->lr.roc) { 3774 calldata->arg.lr_args = &calldata->lr.arg; 3775 calldata->res.lr_res = &calldata->lr.res; 3776 } 3777 nfs_sb_active(calldata->inode->i_sb); 3778 3779 msg.rpc_argp = &calldata->arg; 3780 msg.rpc_resp = &calldata->res; 3781 task_setup_data.callback_data = calldata; 3782 task = rpc_run_task(&task_setup_data); 3783 if (IS_ERR(task)) 3784 return PTR_ERR(task); 3785 status = 0; 3786 if (wait) 3787 status = rpc_wait_for_completion_task(task); 3788 rpc_put_task(task); 3789 return status; 3790 out_free_calldata: 3791 kfree(calldata); 3792 out: 3793 nfs4_put_open_state(state); 3794 nfs4_put_state_owner(sp); 3795 return status; 3796 } 3797 3798 static struct inode * 3799 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3800 int open_flags, struct iattr *attr, int *opened) 3801 { 3802 struct nfs4_state *state; 3803 struct nfs4_label l, *label; 3804 3805 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3806 3807 /* Protect against concurrent sillydeletes */ 3808 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3809 3810 nfs4_label_release_security(label); 3811 3812 if (IS_ERR(state)) 3813 return ERR_CAST(state); 3814 return state->inode; 3815 } 3816 3817 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3818 { 3819 if (ctx->state == NULL) 3820 return; 3821 if (is_sync) 3822 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3823 else 3824 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3825 } 3826 3827 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3828 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3829 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3830 3831 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3832 { 3833 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3834 struct nfs4_server_caps_arg args = { 3835 .fhandle = fhandle, 3836 .bitmask = bitmask, 3837 }; 3838 struct nfs4_server_caps_res res = {}; 3839 struct rpc_message msg = { 3840 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3841 .rpc_argp = &args, 3842 .rpc_resp = &res, 3843 }; 3844 int status; 3845 int i; 3846 3847 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3848 FATTR4_WORD0_FH_EXPIRE_TYPE | 3849 FATTR4_WORD0_LINK_SUPPORT | 3850 FATTR4_WORD0_SYMLINK_SUPPORT | 3851 FATTR4_WORD0_ACLSUPPORT | 3852 FATTR4_WORD0_CASE_INSENSITIVE | 3853 FATTR4_WORD0_CASE_PRESERVING; 3854 if (minorversion) 3855 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3856 3857 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3858 if (status == 0) { 3859 /* Sanity check the server answers */ 3860 switch (minorversion) { 3861 case 0: 3862 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3863 res.attr_bitmask[2] = 0; 3864 break; 3865 case 1: 3866 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3867 break; 3868 case 2: 3869 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3870 } 3871 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3872 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3873 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3874 server->fattr_valid = NFS_ATTR_FATTR_V4; 3875 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3876 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3877 server->caps |= NFS_CAP_ACLS; 3878 if (res.has_links != 0) 3879 server->caps |= NFS_CAP_HARDLINKS; 3880 if (res.has_symlinks != 0) 3881 server->caps |= NFS_CAP_SYMLINKS; 3882 if (res.case_insensitive) 3883 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3884 if (res.case_preserving) 3885 server->caps |= NFS_CAP_CASE_PRESERVING; 3886 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3887 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3888 server->caps |= NFS_CAP_SECURITY_LABEL; 3889 #endif 3890 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3891 server->caps |= NFS_CAP_FS_LOCATIONS; 3892 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3893 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3894 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3895 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3896 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3897 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3898 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3899 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3900 NFS_ATTR_FATTR_OWNER_NAME); 3901 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3902 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3903 NFS_ATTR_FATTR_GROUP_NAME); 3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3905 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3906 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3907 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3908 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3909 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3910 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3911 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3912 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3913 sizeof(server->attr_bitmask)); 3914 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3915 3916 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3917 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3918 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3919 server->cache_consistency_bitmask[2] = 0; 3920 3921 /* Avoid a regression due to buggy server */ 3922 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3923 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3924 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3925 sizeof(server->exclcreat_bitmask)); 3926 3927 server->acl_bitmask = res.acl_bitmask; 3928 server->fh_expire_type = res.fh_expire_type; 3929 } 3930 3931 return status; 3932 } 3933 3934 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3935 { 3936 struct nfs4_exception exception = { 3937 .interruptible = true, 3938 }; 3939 int err; 3940 3941 nfs4_server_set_init_caps(server); 3942 do { 3943 err = nfs4_handle_exception(server, 3944 _nfs4_server_capabilities(server, fhandle), 3945 &exception); 3946 } while (exception.retry); 3947 return err; 3948 } 3949 3950 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3951 struct nfs_client *clp, 3952 struct nfs_server *server) 3953 { 3954 int i; 3955 3956 for (i = 0; i < location->nservers; i++) { 3957 struct nfs4_string *srv_loc = &location->servers[i]; 3958 struct sockaddr_storage addr; 3959 size_t addrlen; 3960 struct xprt_create xprt_args = { 3961 .ident = 0, 3962 .net = clp->cl_net, 3963 }; 3964 struct nfs4_add_xprt_data xprtdata = { 3965 .clp = clp, 3966 }; 3967 struct rpc_add_xprt_test rpcdata = { 3968 .add_xprt_test = clp->cl_mvops->session_trunk, 3969 .data = &xprtdata, 3970 }; 3971 char *servername = NULL; 3972 3973 if (!srv_loc->len) 3974 continue; 3975 3976 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3977 &addr, sizeof(addr), 3978 clp->cl_net, server->port); 3979 if (!addrlen) 3980 return; 3981 xprt_args.dstaddr = (struct sockaddr *)&addr; 3982 xprt_args.addrlen = addrlen; 3983 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3984 if (!servername) 3985 return; 3986 memcpy(servername, srv_loc->data, srv_loc->len); 3987 servername[srv_loc->len] = '\0'; 3988 xprt_args.servername = servername; 3989 3990 xprtdata.cred = nfs4_get_clid_cred(clp); 3991 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3992 rpc_clnt_setup_test_and_add_xprt, 3993 &rpcdata); 3994 if (xprtdata.cred) 3995 put_cred(xprtdata.cred); 3996 kfree(servername); 3997 } 3998 } 3999 4000 static int _nfs4_discover_trunking(struct nfs_server *server, 4001 struct nfs_fh *fhandle) 4002 { 4003 struct nfs4_fs_locations *locations = NULL; 4004 struct page *page; 4005 const struct cred *cred; 4006 struct nfs_client *clp = server->nfs_client; 4007 const struct nfs4_state_maintenance_ops *ops = 4008 clp->cl_mvops->state_renewal_ops; 4009 int status = -ENOMEM, i; 4010 4011 cred = ops->get_state_renewal_cred(clp); 4012 if (cred == NULL) { 4013 cred = nfs4_get_clid_cred(clp); 4014 if (cred == NULL) 4015 return -ENOKEY; 4016 } 4017 4018 page = alloc_page(GFP_KERNEL); 4019 if (!page) 4020 goto out_put_cred; 4021 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4022 if (!locations) 4023 goto out_free; 4024 locations->fattr = nfs_alloc_fattr(); 4025 if (!locations->fattr) 4026 goto out_free_2; 4027 4028 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4029 cred); 4030 if (status) 4031 goto out_free_3; 4032 4033 for (i = 0; i < locations->nlocations; i++) 4034 test_fs_location_for_trunking(&locations->locations[i], clp, 4035 server); 4036 out_free_3: 4037 kfree(locations->fattr); 4038 out_free_2: 4039 kfree(locations); 4040 out_free: 4041 __free_page(page); 4042 out_put_cred: 4043 put_cred(cred); 4044 return status; 4045 } 4046 4047 static int nfs4_discover_trunking(struct nfs_server *server, 4048 struct nfs_fh *fhandle) 4049 { 4050 struct nfs4_exception exception = { 4051 .interruptible = true, 4052 }; 4053 struct nfs_client *clp = server->nfs_client; 4054 int err = 0; 4055 4056 if (!nfs4_has_session(clp)) 4057 goto out; 4058 do { 4059 err = nfs4_handle_exception(server, 4060 _nfs4_discover_trunking(server, fhandle), 4061 &exception); 4062 } while (exception.retry); 4063 out: 4064 return err; 4065 } 4066 4067 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4068 struct nfs_fsinfo *info) 4069 { 4070 u32 bitmask[3]; 4071 struct nfs4_lookup_root_arg args = { 4072 .bitmask = bitmask, 4073 }; 4074 struct nfs4_lookup_res res = { 4075 .server = server, 4076 .fattr = info->fattr, 4077 .fh = fhandle, 4078 }; 4079 struct rpc_message msg = { 4080 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4081 .rpc_argp = &args, 4082 .rpc_resp = &res, 4083 }; 4084 4085 bitmask[0] = nfs4_fattr_bitmap[0]; 4086 bitmask[1] = nfs4_fattr_bitmap[1]; 4087 /* 4088 * Process the label in the upcoming getfattr 4089 */ 4090 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4091 4092 nfs_fattr_init(info->fattr); 4093 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4094 } 4095 4096 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4097 struct nfs_fsinfo *info) 4098 { 4099 struct nfs4_exception exception = { 4100 .interruptible = true, 4101 }; 4102 int err; 4103 do { 4104 err = _nfs4_lookup_root(server, fhandle, info); 4105 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4106 switch (err) { 4107 case 0: 4108 case -NFS4ERR_WRONGSEC: 4109 goto out; 4110 default: 4111 err = nfs4_handle_exception(server, err, &exception); 4112 } 4113 } while (exception.retry); 4114 out: 4115 return err; 4116 } 4117 4118 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4119 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4120 { 4121 struct rpc_auth_create_args auth_args = { 4122 .pseudoflavor = flavor, 4123 }; 4124 struct rpc_auth *auth; 4125 4126 auth = rpcauth_create(&auth_args, server->client); 4127 if (IS_ERR(auth)) 4128 return -EACCES; 4129 return nfs4_lookup_root(server, fhandle, info); 4130 } 4131 4132 /* 4133 * Retry pseudoroot lookup with various security flavors. We do this when: 4134 * 4135 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4136 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4137 * 4138 * Returns zero on success, or a negative NFS4ERR value, or a 4139 * negative errno value. 4140 */ 4141 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4142 struct nfs_fsinfo *info) 4143 { 4144 /* Per 3530bis 15.33.5 */ 4145 static const rpc_authflavor_t flav_array[] = { 4146 RPC_AUTH_GSS_KRB5P, 4147 RPC_AUTH_GSS_KRB5I, 4148 RPC_AUTH_GSS_KRB5, 4149 RPC_AUTH_UNIX, /* courtesy */ 4150 RPC_AUTH_NULL, 4151 }; 4152 int status = -EPERM; 4153 size_t i; 4154 4155 if (server->auth_info.flavor_len > 0) { 4156 /* try each flavor specified by user */ 4157 for (i = 0; i < server->auth_info.flavor_len; i++) { 4158 status = nfs4_lookup_root_sec(server, fhandle, info, 4159 server->auth_info.flavors[i]); 4160 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4161 continue; 4162 break; 4163 } 4164 } else { 4165 /* no flavors specified by user, try default list */ 4166 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4167 status = nfs4_lookup_root_sec(server, fhandle, info, 4168 flav_array[i]); 4169 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4170 continue; 4171 break; 4172 } 4173 } 4174 4175 /* 4176 * -EACCES could mean that the user doesn't have correct permissions 4177 * to access the mount. It could also mean that we tried to mount 4178 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4179 * existing mount programs don't handle -EACCES very well so it should 4180 * be mapped to -EPERM instead. 4181 */ 4182 if (status == -EACCES) 4183 status = -EPERM; 4184 return status; 4185 } 4186 4187 /** 4188 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4189 * @server: initialized nfs_server handle 4190 * @fhandle: we fill in the pseudo-fs root file handle 4191 * @info: we fill in an FSINFO struct 4192 * @auth_probe: probe the auth flavours 4193 * 4194 * Returns zero on success, or a negative errno. 4195 */ 4196 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4197 struct nfs_fsinfo *info, 4198 bool auth_probe) 4199 { 4200 int status = 0; 4201 4202 if (!auth_probe) 4203 status = nfs4_lookup_root(server, fhandle, info); 4204 4205 if (auth_probe || status == NFS4ERR_WRONGSEC) 4206 status = server->nfs_client->cl_mvops->find_root_sec(server, 4207 fhandle, info); 4208 4209 if (status == 0) 4210 status = nfs4_server_capabilities(server, fhandle); 4211 if (status == 0) 4212 status = nfs4_do_fsinfo(server, fhandle, info); 4213 4214 return nfs4_map_errors(status); 4215 } 4216 4217 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4218 struct nfs_fsinfo *info) 4219 { 4220 int error; 4221 struct nfs_fattr *fattr = info->fattr; 4222 4223 error = nfs4_server_capabilities(server, mntfh); 4224 if (error < 0) { 4225 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4226 return error; 4227 } 4228 4229 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4230 if (error < 0) { 4231 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4232 goto out; 4233 } 4234 4235 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4236 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4237 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4238 4239 out: 4240 return error; 4241 } 4242 4243 /* 4244 * Get locations and (maybe) other attributes of a referral. 4245 * Note that we'll actually follow the referral later when 4246 * we detect fsid mismatch in inode revalidation 4247 */ 4248 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4249 const struct qstr *name, struct nfs_fattr *fattr, 4250 struct nfs_fh *fhandle) 4251 { 4252 int status = -ENOMEM; 4253 struct page *page = NULL; 4254 struct nfs4_fs_locations *locations = NULL; 4255 4256 page = alloc_page(GFP_KERNEL); 4257 if (page == NULL) 4258 goto out; 4259 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4260 if (locations == NULL) 4261 goto out; 4262 4263 locations->fattr = fattr; 4264 4265 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4266 if (status != 0) 4267 goto out; 4268 4269 /* 4270 * If the fsid didn't change, this is a migration event, not a 4271 * referral. Cause us to drop into the exception handler, which 4272 * will kick off migration recovery. 4273 */ 4274 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4275 dprintk("%s: server did not return a different fsid for" 4276 " a referral at %s\n", __func__, name->name); 4277 status = -NFS4ERR_MOVED; 4278 goto out; 4279 } 4280 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4281 nfs_fixup_referral_attributes(fattr); 4282 memset(fhandle, 0, sizeof(struct nfs_fh)); 4283 out: 4284 if (page) 4285 __free_page(page); 4286 kfree(locations); 4287 return status; 4288 } 4289 4290 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4291 struct nfs_fattr *fattr, struct inode *inode) 4292 { 4293 __u32 bitmask[NFS4_BITMASK_SZ]; 4294 struct nfs4_getattr_arg args = { 4295 .fh = fhandle, 4296 .bitmask = bitmask, 4297 }; 4298 struct nfs4_getattr_res res = { 4299 .fattr = fattr, 4300 .server = server, 4301 }; 4302 struct rpc_message msg = { 4303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4304 .rpc_argp = &args, 4305 .rpc_resp = &res, 4306 }; 4307 unsigned short task_flags = 0; 4308 4309 if (nfs4_has_session(server->nfs_client)) 4310 task_flags = RPC_TASK_MOVEABLE; 4311 4312 /* Is this is an attribute revalidation, subject to softreval? */ 4313 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4314 task_flags |= RPC_TASK_TIMEOUT; 4315 4316 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4317 nfs_fattr_init(fattr); 4318 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4319 return nfs4_do_call_sync(server->client, server, &msg, 4320 &args.seq_args, &res.seq_res, task_flags); 4321 } 4322 4323 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4324 struct nfs_fattr *fattr, struct inode *inode) 4325 { 4326 struct nfs4_exception exception = { 4327 .interruptible = true, 4328 }; 4329 int err; 4330 do { 4331 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4332 trace_nfs4_getattr(server, fhandle, fattr, err); 4333 err = nfs4_handle_exception(server, err, 4334 &exception); 4335 } while (exception.retry); 4336 return err; 4337 } 4338 4339 /* 4340 * The file is not closed if it is opened due to the a request to change 4341 * the size of the file. The open call will not be needed once the 4342 * VFS layer lookup-intents are implemented. 4343 * 4344 * Close is called when the inode is destroyed. 4345 * If we haven't opened the file for O_WRONLY, we 4346 * need to in the size_change case to obtain a stateid. 4347 * 4348 * Got race? 4349 * Because OPEN is always done by name in nfsv4, it is 4350 * possible that we opened a different file by the same 4351 * name. We can recognize this race condition, but we 4352 * can't do anything about it besides returning an error. 4353 * 4354 * This will be fixed with VFS changes (lookup-intent). 4355 */ 4356 static int 4357 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4358 struct iattr *sattr) 4359 { 4360 struct inode *inode = d_inode(dentry); 4361 const struct cred *cred = NULL; 4362 struct nfs_open_context *ctx = NULL; 4363 int status; 4364 4365 if (pnfs_ld_layoutret_on_setattr(inode) && 4366 sattr->ia_valid & ATTR_SIZE && 4367 sattr->ia_size < i_size_read(inode)) 4368 pnfs_commit_and_return_layout(inode); 4369 4370 nfs_fattr_init(fattr); 4371 4372 /* Deal with open(O_TRUNC) */ 4373 if (sattr->ia_valid & ATTR_OPEN) 4374 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4375 4376 /* Optimization: if the end result is no change, don't RPC */ 4377 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4378 return 0; 4379 4380 /* Search for an existing open(O_WRITE) file */ 4381 if (sattr->ia_valid & ATTR_FILE) { 4382 4383 ctx = nfs_file_open_context(sattr->ia_file); 4384 if (ctx) 4385 cred = ctx->cred; 4386 } 4387 4388 /* Return any delegations if we're going to change ACLs */ 4389 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4390 nfs4_inode_make_writeable(inode); 4391 4392 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4393 if (status == 0) { 4394 nfs_setattr_update_inode(inode, sattr, fattr); 4395 nfs_setsecurity(inode, fattr); 4396 } 4397 return status; 4398 } 4399 4400 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4401 struct dentry *dentry, struct nfs_fh *fhandle, 4402 struct nfs_fattr *fattr) 4403 { 4404 struct nfs_server *server = NFS_SERVER(dir); 4405 int status; 4406 struct nfs4_lookup_arg args = { 4407 .bitmask = server->attr_bitmask, 4408 .dir_fh = NFS_FH(dir), 4409 .name = &dentry->d_name, 4410 }; 4411 struct nfs4_lookup_res res = { 4412 .server = server, 4413 .fattr = fattr, 4414 .fh = fhandle, 4415 }; 4416 struct rpc_message msg = { 4417 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4418 .rpc_argp = &args, 4419 .rpc_resp = &res, 4420 }; 4421 unsigned short task_flags = 0; 4422 4423 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4424 task_flags = RPC_TASK_MOVEABLE; 4425 4426 /* Is this is an attribute revalidation, subject to softreval? */ 4427 if (nfs_lookup_is_soft_revalidate(dentry)) 4428 task_flags |= RPC_TASK_TIMEOUT; 4429 4430 args.bitmask = nfs4_bitmask(server, fattr->label); 4431 4432 nfs_fattr_init(fattr); 4433 4434 dprintk("NFS call lookup %pd2\n", dentry); 4435 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4436 status = nfs4_do_call_sync(clnt, server, &msg, 4437 &args.seq_args, &res.seq_res, task_flags); 4438 dprintk("NFS reply lookup: %d\n", status); 4439 return status; 4440 } 4441 4442 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4443 { 4444 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4445 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4446 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4447 fattr->nlink = 2; 4448 } 4449 4450 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4451 struct dentry *dentry, struct nfs_fh *fhandle, 4452 struct nfs_fattr *fattr) 4453 { 4454 struct nfs4_exception exception = { 4455 .interruptible = true, 4456 }; 4457 struct rpc_clnt *client = *clnt; 4458 const struct qstr *name = &dentry->d_name; 4459 int err; 4460 do { 4461 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4462 trace_nfs4_lookup(dir, name, err); 4463 switch (err) { 4464 case -NFS4ERR_BADNAME: 4465 err = -ENOENT; 4466 goto out; 4467 case -NFS4ERR_MOVED: 4468 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4469 if (err == -NFS4ERR_MOVED) 4470 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4471 goto out; 4472 case -NFS4ERR_WRONGSEC: 4473 err = -EPERM; 4474 if (client != *clnt) 4475 goto out; 4476 client = nfs4_negotiate_security(client, dir, name); 4477 if (IS_ERR(client)) 4478 return PTR_ERR(client); 4479 4480 exception.retry = 1; 4481 break; 4482 default: 4483 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4484 } 4485 } while (exception.retry); 4486 4487 out: 4488 if (err == 0) 4489 *clnt = client; 4490 else if (client != *clnt) 4491 rpc_shutdown_client(client); 4492 4493 return err; 4494 } 4495 4496 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4497 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4498 { 4499 int status; 4500 struct rpc_clnt *client = NFS_CLIENT(dir); 4501 4502 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4503 if (client != NFS_CLIENT(dir)) { 4504 rpc_shutdown_client(client); 4505 nfs_fixup_secinfo_attributes(fattr); 4506 } 4507 return status; 4508 } 4509 4510 struct rpc_clnt * 4511 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4512 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4513 { 4514 struct rpc_clnt *client = NFS_CLIENT(dir); 4515 int status; 4516 4517 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4518 if (status < 0) 4519 return ERR_PTR(status); 4520 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4521 } 4522 4523 static int _nfs4_proc_lookupp(struct inode *inode, 4524 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4525 { 4526 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4527 struct nfs_server *server = NFS_SERVER(inode); 4528 int status; 4529 struct nfs4_lookupp_arg args = { 4530 .bitmask = server->attr_bitmask, 4531 .fh = NFS_FH(inode), 4532 }; 4533 struct nfs4_lookupp_res res = { 4534 .server = server, 4535 .fattr = fattr, 4536 .fh = fhandle, 4537 }; 4538 struct rpc_message msg = { 4539 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4540 .rpc_argp = &args, 4541 .rpc_resp = &res, 4542 }; 4543 unsigned short task_flags = 0; 4544 4545 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4546 task_flags |= RPC_TASK_TIMEOUT; 4547 4548 args.bitmask = nfs4_bitmask(server, fattr->label); 4549 4550 nfs_fattr_init(fattr); 4551 4552 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4553 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4554 &res.seq_res, task_flags); 4555 dprintk("NFS reply lookupp: %d\n", status); 4556 return status; 4557 } 4558 4559 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4560 struct nfs_fattr *fattr) 4561 { 4562 struct nfs4_exception exception = { 4563 .interruptible = true, 4564 }; 4565 int err; 4566 do { 4567 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4568 trace_nfs4_lookupp(inode, err); 4569 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4570 &exception); 4571 } while (exception.retry); 4572 return err; 4573 } 4574 4575 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4576 const struct cred *cred) 4577 { 4578 struct nfs_server *server = NFS_SERVER(inode); 4579 struct nfs4_accessargs args = { 4580 .fh = NFS_FH(inode), 4581 .access = entry->mask, 4582 }; 4583 struct nfs4_accessres res = { 4584 .server = server, 4585 }; 4586 struct rpc_message msg = { 4587 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4588 .rpc_argp = &args, 4589 .rpc_resp = &res, 4590 .rpc_cred = cred, 4591 }; 4592 int status = 0; 4593 4594 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4595 res.fattr = nfs_alloc_fattr(); 4596 if (res.fattr == NULL) 4597 return -ENOMEM; 4598 args.bitmask = server->cache_consistency_bitmask; 4599 } 4600 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4601 if (!status) { 4602 nfs_access_set_mask(entry, res.access); 4603 if (res.fattr) 4604 nfs_refresh_inode(inode, res.fattr); 4605 } 4606 nfs_free_fattr(res.fattr); 4607 return status; 4608 } 4609 4610 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4611 const struct cred *cred) 4612 { 4613 struct nfs4_exception exception = { 4614 .interruptible = true, 4615 }; 4616 int err; 4617 do { 4618 err = _nfs4_proc_access(inode, entry, cred); 4619 trace_nfs4_access(inode, err); 4620 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4621 &exception); 4622 } while (exception.retry); 4623 return err; 4624 } 4625 4626 /* 4627 * TODO: For the time being, we don't try to get any attributes 4628 * along with any of the zero-copy operations READ, READDIR, 4629 * READLINK, WRITE. 4630 * 4631 * In the case of the first three, we want to put the GETATTR 4632 * after the read-type operation -- this is because it is hard 4633 * to predict the length of a GETATTR response in v4, and thus 4634 * align the READ data correctly. This means that the GETATTR 4635 * may end up partially falling into the page cache, and we should 4636 * shift it into the 'tail' of the xdr_buf before processing. 4637 * To do this efficiently, we need to know the total length 4638 * of data received, which doesn't seem to be available outside 4639 * of the RPC layer. 4640 * 4641 * In the case of WRITE, we also want to put the GETATTR after 4642 * the operation -- in this case because we want to make sure 4643 * we get the post-operation mtime and size. 4644 * 4645 * Both of these changes to the XDR layer would in fact be quite 4646 * minor, but I decided to leave them for a subsequent patch. 4647 */ 4648 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4649 unsigned int pgbase, unsigned int pglen) 4650 { 4651 struct nfs4_readlink args = { 4652 .fh = NFS_FH(inode), 4653 .pgbase = pgbase, 4654 .pglen = pglen, 4655 .pages = &page, 4656 }; 4657 struct nfs4_readlink_res res; 4658 struct rpc_message msg = { 4659 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4660 .rpc_argp = &args, 4661 .rpc_resp = &res, 4662 }; 4663 4664 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4665 } 4666 4667 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4668 unsigned int pgbase, unsigned int pglen) 4669 { 4670 struct nfs4_exception exception = { 4671 .interruptible = true, 4672 }; 4673 int err; 4674 do { 4675 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4676 trace_nfs4_readlink(inode, err); 4677 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4678 &exception); 4679 } while (exception.retry); 4680 return err; 4681 } 4682 4683 /* 4684 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4685 */ 4686 static int 4687 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4688 int flags) 4689 { 4690 struct nfs_server *server = NFS_SERVER(dir); 4691 struct nfs4_label l, *ilabel; 4692 struct nfs_open_context *ctx; 4693 struct nfs4_state *state; 4694 int status = 0; 4695 4696 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4697 if (IS_ERR(ctx)) 4698 return PTR_ERR(ctx); 4699 4700 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4701 4702 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4703 sattr->ia_mode &= ~current_umask(); 4704 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4705 if (IS_ERR(state)) { 4706 status = PTR_ERR(state); 4707 goto out; 4708 } 4709 out: 4710 nfs4_label_release_security(ilabel); 4711 put_nfs_open_context(ctx); 4712 return status; 4713 } 4714 4715 static int 4716 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4717 { 4718 struct nfs_server *server = NFS_SERVER(dir); 4719 struct nfs_removeargs args = { 4720 .fh = NFS_FH(dir), 4721 .name = *name, 4722 }; 4723 struct nfs_removeres res = { 4724 .server = server, 4725 }; 4726 struct rpc_message msg = { 4727 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4728 .rpc_argp = &args, 4729 .rpc_resp = &res, 4730 }; 4731 unsigned long timestamp = jiffies; 4732 int status; 4733 4734 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4735 if (status == 0) { 4736 spin_lock(&dir->i_lock); 4737 /* Removing a directory decrements nlink in the parent */ 4738 if (ftype == NF4DIR && dir->i_nlink > 2) 4739 nfs4_dec_nlink_locked(dir); 4740 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4741 NFS_INO_INVALID_DATA); 4742 spin_unlock(&dir->i_lock); 4743 } 4744 return status; 4745 } 4746 4747 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4748 { 4749 struct nfs4_exception exception = { 4750 .interruptible = true, 4751 }; 4752 struct inode *inode = d_inode(dentry); 4753 int err; 4754 4755 if (inode) { 4756 if (inode->i_nlink == 1) 4757 nfs4_inode_return_delegation(inode); 4758 else 4759 nfs4_inode_make_writeable(inode); 4760 } 4761 do { 4762 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4763 trace_nfs4_remove(dir, &dentry->d_name, err); 4764 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4765 &exception); 4766 } while (exception.retry); 4767 return err; 4768 } 4769 4770 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4771 { 4772 struct nfs4_exception exception = { 4773 .interruptible = true, 4774 }; 4775 int err; 4776 4777 do { 4778 err = _nfs4_proc_remove(dir, name, NF4DIR); 4779 trace_nfs4_remove(dir, name, err); 4780 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4781 &exception); 4782 } while (exception.retry); 4783 return err; 4784 } 4785 4786 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4787 struct dentry *dentry, 4788 struct inode *inode) 4789 { 4790 struct nfs_removeargs *args = msg->rpc_argp; 4791 struct nfs_removeres *res = msg->rpc_resp; 4792 4793 res->server = NFS_SB(dentry->d_sb); 4794 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4795 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4796 4797 nfs_fattr_init(res->dir_attr); 4798 4799 if (inode) { 4800 nfs4_inode_return_delegation(inode); 4801 nfs_d_prune_case_insensitive_aliases(inode); 4802 } 4803 } 4804 4805 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4806 { 4807 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4808 &data->args.seq_args, 4809 &data->res.seq_res, 4810 task); 4811 } 4812 4813 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4814 { 4815 struct nfs_unlinkdata *data = task->tk_calldata; 4816 struct nfs_removeres *res = &data->res; 4817 4818 if (!nfs4_sequence_done(task, &res->seq_res)) 4819 return 0; 4820 if (nfs4_async_handle_error(task, res->server, NULL, 4821 &data->timeout) == -EAGAIN) 4822 return 0; 4823 if (task->tk_status == 0) 4824 nfs4_update_changeattr(dir, &res->cinfo, 4825 res->dir_attr->time_start, 4826 NFS_INO_INVALID_DATA); 4827 return 1; 4828 } 4829 4830 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4831 struct dentry *old_dentry, 4832 struct dentry *new_dentry) 4833 { 4834 struct nfs_renameargs *arg = msg->rpc_argp; 4835 struct nfs_renameres *res = msg->rpc_resp; 4836 struct inode *old_inode = d_inode(old_dentry); 4837 struct inode *new_inode = d_inode(new_dentry); 4838 4839 if (old_inode) 4840 nfs4_inode_make_writeable(old_inode); 4841 if (new_inode) 4842 nfs4_inode_return_delegation(new_inode); 4843 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4844 res->server = NFS_SB(old_dentry->d_sb); 4845 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4846 } 4847 4848 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4849 { 4850 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4851 &data->args.seq_args, 4852 &data->res.seq_res, 4853 task); 4854 } 4855 4856 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4857 struct inode *new_dir) 4858 { 4859 struct nfs_renamedata *data = task->tk_calldata; 4860 struct nfs_renameres *res = &data->res; 4861 4862 if (!nfs4_sequence_done(task, &res->seq_res)) 4863 return 0; 4864 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4865 return 0; 4866 4867 if (task->tk_status == 0) { 4868 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4869 if (new_dir != old_dir) { 4870 /* Note: If we moved a directory, nlink will change */ 4871 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4872 res->old_fattr->time_start, 4873 NFS_INO_INVALID_NLINK | 4874 NFS_INO_INVALID_DATA); 4875 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4876 res->new_fattr->time_start, 4877 NFS_INO_INVALID_NLINK | 4878 NFS_INO_INVALID_DATA); 4879 } else 4880 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4881 res->old_fattr->time_start, 4882 NFS_INO_INVALID_DATA); 4883 } 4884 return 1; 4885 } 4886 4887 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4888 { 4889 struct nfs_server *server = NFS_SERVER(inode); 4890 __u32 bitmask[NFS4_BITMASK_SZ]; 4891 struct nfs4_link_arg arg = { 4892 .fh = NFS_FH(inode), 4893 .dir_fh = NFS_FH(dir), 4894 .name = name, 4895 .bitmask = bitmask, 4896 }; 4897 struct nfs4_link_res res = { 4898 .server = server, 4899 }; 4900 struct rpc_message msg = { 4901 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4902 .rpc_argp = &arg, 4903 .rpc_resp = &res, 4904 }; 4905 int status = -ENOMEM; 4906 4907 res.fattr = nfs_alloc_fattr_with_label(server); 4908 if (res.fattr == NULL) 4909 goto out; 4910 4911 nfs4_inode_make_writeable(inode); 4912 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4913 NFS_INO_INVALID_CHANGE); 4914 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4915 if (!status) { 4916 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4917 NFS_INO_INVALID_DATA); 4918 nfs4_inc_nlink(inode); 4919 status = nfs_post_op_update_inode(inode, res.fattr); 4920 if (!status) 4921 nfs_setsecurity(inode, res.fattr); 4922 } 4923 4924 out: 4925 nfs_free_fattr(res.fattr); 4926 return status; 4927 } 4928 4929 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4930 { 4931 struct nfs4_exception exception = { 4932 .interruptible = true, 4933 }; 4934 int err; 4935 do { 4936 err = nfs4_handle_exception(NFS_SERVER(inode), 4937 _nfs4_proc_link(inode, dir, name), 4938 &exception); 4939 } while (exception.retry); 4940 return err; 4941 } 4942 4943 struct nfs4_createdata { 4944 struct rpc_message msg; 4945 struct nfs4_create_arg arg; 4946 struct nfs4_create_res res; 4947 struct nfs_fh fh; 4948 struct nfs_fattr fattr; 4949 }; 4950 4951 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4952 const struct qstr *name, struct iattr *sattr, u32 ftype) 4953 { 4954 struct nfs4_createdata *data; 4955 4956 data = kzalloc(sizeof(*data), GFP_KERNEL); 4957 if (data != NULL) { 4958 struct nfs_server *server = NFS_SERVER(dir); 4959 4960 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4961 if (IS_ERR(data->fattr.label)) 4962 goto out_free; 4963 4964 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4965 data->msg.rpc_argp = &data->arg; 4966 data->msg.rpc_resp = &data->res; 4967 data->arg.dir_fh = NFS_FH(dir); 4968 data->arg.server = server; 4969 data->arg.name = name; 4970 data->arg.attrs = sattr; 4971 data->arg.ftype = ftype; 4972 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4973 data->arg.umask = current_umask(); 4974 data->res.server = server; 4975 data->res.fh = &data->fh; 4976 data->res.fattr = &data->fattr; 4977 nfs_fattr_init(data->res.fattr); 4978 } 4979 return data; 4980 out_free: 4981 kfree(data); 4982 return NULL; 4983 } 4984 4985 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4986 { 4987 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4988 &data->arg.seq_args, &data->res.seq_res, 1); 4989 if (status == 0) { 4990 spin_lock(&dir->i_lock); 4991 /* Creating a directory bumps nlink in the parent */ 4992 if (data->arg.ftype == NF4DIR) 4993 nfs4_inc_nlink_locked(dir); 4994 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4995 data->res.fattr->time_start, 4996 NFS_INO_INVALID_DATA); 4997 spin_unlock(&dir->i_lock); 4998 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 4999 } 5000 return status; 5001 } 5002 5003 static void nfs4_free_createdata(struct nfs4_createdata *data) 5004 { 5005 nfs4_label_free(data->fattr.label); 5006 kfree(data); 5007 } 5008 5009 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5010 struct page *page, unsigned int len, struct iattr *sattr, 5011 struct nfs4_label *label) 5012 { 5013 struct nfs4_createdata *data; 5014 int status = -ENAMETOOLONG; 5015 5016 if (len > NFS4_MAXPATHLEN) 5017 goto out; 5018 5019 status = -ENOMEM; 5020 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5021 if (data == NULL) 5022 goto out; 5023 5024 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5025 data->arg.u.symlink.pages = &page; 5026 data->arg.u.symlink.len = len; 5027 data->arg.label = label; 5028 5029 status = nfs4_do_create(dir, dentry, data); 5030 5031 nfs4_free_createdata(data); 5032 out: 5033 return status; 5034 } 5035 5036 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5037 struct page *page, unsigned int len, struct iattr *sattr) 5038 { 5039 struct nfs4_exception exception = { 5040 .interruptible = true, 5041 }; 5042 struct nfs4_label l, *label; 5043 int err; 5044 5045 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5046 5047 do { 5048 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5049 trace_nfs4_symlink(dir, &dentry->d_name, err); 5050 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5051 &exception); 5052 } while (exception.retry); 5053 5054 nfs4_label_release_security(label); 5055 return err; 5056 } 5057 5058 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5059 struct iattr *sattr, struct nfs4_label *label) 5060 { 5061 struct nfs4_createdata *data; 5062 int status = -ENOMEM; 5063 5064 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5065 if (data == NULL) 5066 goto out; 5067 5068 data->arg.label = label; 5069 status = nfs4_do_create(dir, dentry, data); 5070 5071 nfs4_free_createdata(data); 5072 out: 5073 return status; 5074 } 5075 5076 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5077 struct iattr *sattr) 5078 { 5079 struct nfs_server *server = NFS_SERVER(dir); 5080 struct nfs4_exception exception = { 5081 .interruptible = true, 5082 }; 5083 struct nfs4_label l, *label; 5084 int err; 5085 5086 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5087 5088 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5089 sattr->ia_mode &= ~current_umask(); 5090 do { 5091 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5092 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5093 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5094 &exception); 5095 } while (exception.retry); 5096 nfs4_label_release_security(label); 5097 5098 return err; 5099 } 5100 5101 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5102 struct nfs_readdir_res *nr_res) 5103 { 5104 struct inode *dir = d_inode(nr_arg->dentry); 5105 struct nfs_server *server = NFS_SERVER(dir); 5106 struct nfs4_readdir_arg args = { 5107 .fh = NFS_FH(dir), 5108 .pages = nr_arg->pages, 5109 .pgbase = 0, 5110 .count = nr_arg->page_len, 5111 .plus = nr_arg->plus, 5112 }; 5113 struct nfs4_readdir_res res; 5114 struct rpc_message msg = { 5115 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5116 .rpc_argp = &args, 5117 .rpc_resp = &res, 5118 .rpc_cred = nr_arg->cred, 5119 }; 5120 int status; 5121 5122 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5123 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5124 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5125 args.bitmask = server->attr_bitmask_nl; 5126 else 5127 args.bitmask = server->attr_bitmask; 5128 5129 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5130 res.pgbase = args.pgbase; 5131 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5132 &res.seq_res, 0); 5133 if (status >= 0) { 5134 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5135 status += args.pgbase; 5136 } 5137 5138 nfs_invalidate_atime(dir); 5139 5140 dprintk("%s: returns %d\n", __func__, status); 5141 return status; 5142 } 5143 5144 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5145 struct nfs_readdir_res *res) 5146 { 5147 struct nfs4_exception exception = { 5148 .interruptible = true, 5149 }; 5150 int err; 5151 do { 5152 err = _nfs4_proc_readdir(arg, res); 5153 trace_nfs4_readdir(d_inode(arg->dentry), err); 5154 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5155 err, &exception); 5156 } while (exception.retry); 5157 return err; 5158 } 5159 5160 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5161 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5162 { 5163 struct nfs4_createdata *data; 5164 int mode = sattr->ia_mode; 5165 int status = -ENOMEM; 5166 5167 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5168 if (data == NULL) 5169 goto out; 5170 5171 if (S_ISFIFO(mode)) 5172 data->arg.ftype = NF4FIFO; 5173 else if (S_ISBLK(mode)) { 5174 data->arg.ftype = NF4BLK; 5175 data->arg.u.device.specdata1 = MAJOR(rdev); 5176 data->arg.u.device.specdata2 = MINOR(rdev); 5177 } 5178 else if (S_ISCHR(mode)) { 5179 data->arg.ftype = NF4CHR; 5180 data->arg.u.device.specdata1 = MAJOR(rdev); 5181 data->arg.u.device.specdata2 = MINOR(rdev); 5182 } else if (!S_ISSOCK(mode)) { 5183 status = -EINVAL; 5184 goto out_free; 5185 } 5186 5187 data->arg.label = label; 5188 status = nfs4_do_create(dir, dentry, data); 5189 out_free: 5190 nfs4_free_createdata(data); 5191 out: 5192 return status; 5193 } 5194 5195 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5196 struct iattr *sattr, dev_t rdev) 5197 { 5198 struct nfs_server *server = NFS_SERVER(dir); 5199 struct nfs4_exception exception = { 5200 .interruptible = true, 5201 }; 5202 struct nfs4_label l, *label; 5203 int err; 5204 5205 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5206 5207 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5208 sattr->ia_mode &= ~current_umask(); 5209 do { 5210 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5211 trace_nfs4_mknod(dir, &dentry->d_name, err); 5212 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5213 &exception); 5214 } while (exception.retry); 5215 5216 nfs4_label_release_security(label); 5217 5218 return err; 5219 } 5220 5221 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5222 struct nfs_fsstat *fsstat) 5223 { 5224 struct nfs4_statfs_arg args = { 5225 .fh = fhandle, 5226 .bitmask = server->attr_bitmask, 5227 }; 5228 struct nfs4_statfs_res res = { 5229 .fsstat = fsstat, 5230 }; 5231 struct rpc_message msg = { 5232 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5233 .rpc_argp = &args, 5234 .rpc_resp = &res, 5235 }; 5236 5237 nfs_fattr_init(fsstat->fattr); 5238 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5239 } 5240 5241 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5242 { 5243 struct nfs4_exception exception = { 5244 .interruptible = true, 5245 }; 5246 int err; 5247 do { 5248 err = nfs4_handle_exception(server, 5249 _nfs4_proc_statfs(server, fhandle, fsstat), 5250 &exception); 5251 } while (exception.retry); 5252 return err; 5253 } 5254 5255 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5256 struct nfs_fsinfo *fsinfo) 5257 { 5258 struct nfs4_fsinfo_arg args = { 5259 .fh = fhandle, 5260 .bitmask = server->attr_bitmask, 5261 }; 5262 struct nfs4_fsinfo_res res = { 5263 .fsinfo = fsinfo, 5264 }; 5265 struct rpc_message msg = { 5266 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5267 .rpc_argp = &args, 5268 .rpc_resp = &res, 5269 }; 5270 5271 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5272 } 5273 5274 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5275 { 5276 struct nfs4_exception exception = { 5277 .interruptible = true, 5278 }; 5279 int err; 5280 5281 do { 5282 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5283 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5284 if (err == 0) { 5285 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5286 break; 5287 } 5288 err = nfs4_handle_exception(server, err, &exception); 5289 } while (exception.retry); 5290 return err; 5291 } 5292 5293 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5294 { 5295 int error; 5296 5297 nfs_fattr_init(fsinfo->fattr); 5298 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5299 if (error == 0) { 5300 /* block layout checks this! */ 5301 server->pnfs_blksize = fsinfo->blksize; 5302 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5303 } 5304 5305 return error; 5306 } 5307 5308 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5309 struct nfs_pathconf *pathconf) 5310 { 5311 struct nfs4_pathconf_arg args = { 5312 .fh = fhandle, 5313 .bitmask = server->attr_bitmask, 5314 }; 5315 struct nfs4_pathconf_res res = { 5316 .pathconf = pathconf, 5317 }; 5318 struct rpc_message msg = { 5319 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5320 .rpc_argp = &args, 5321 .rpc_resp = &res, 5322 }; 5323 5324 /* None of the pathconf attributes are mandatory to implement */ 5325 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5326 memset(pathconf, 0, sizeof(*pathconf)); 5327 return 0; 5328 } 5329 5330 nfs_fattr_init(pathconf->fattr); 5331 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5332 } 5333 5334 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5335 struct nfs_pathconf *pathconf) 5336 { 5337 struct nfs4_exception exception = { 5338 .interruptible = true, 5339 }; 5340 int err; 5341 5342 do { 5343 err = nfs4_handle_exception(server, 5344 _nfs4_proc_pathconf(server, fhandle, pathconf), 5345 &exception); 5346 } while (exception.retry); 5347 return err; 5348 } 5349 5350 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5351 const struct nfs_open_context *ctx, 5352 const struct nfs_lock_context *l_ctx, 5353 fmode_t fmode) 5354 { 5355 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5356 } 5357 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5358 5359 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5360 const struct nfs_open_context *ctx, 5361 const struct nfs_lock_context *l_ctx, 5362 fmode_t fmode) 5363 { 5364 nfs4_stateid _current_stateid; 5365 5366 /* If the current stateid represents a lost lock, then exit */ 5367 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5368 return true; 5369 return nfs4_stateid_match(stateid, &_current_stateid); 5370 } 5371 5372 static bool nfs4_error_stateid_expired(int err) 5373 { 5374 switch (err) { 5375 case -NFS4ERR_DELEG_REVOKED: 5376 case -NFS4ERR_ADMIN_REVOKED: 5377 case -NFS4ERR_BAD_STATEID: 5378 case -NFS4ERR_STALE_STATEID: 5379 case -NFS4ERR_OLD_STATEID: 5380 case -NFS4ERR_OPENMODE: 5381 case -NFS4ERR_EXPIRED: 5382 return true; 5383 } 5384 return false; 5385 } 5386 5387 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5388 { 5389 struct nfs_server *server = NFS_SERVER(hdr->inode); 5390 5391 trace_nfs4_read(hdr, task->tk_status); 5392 if (task->tk_status < 0) { 5393 struct nfs4_exception exception = { 5394 .inode = hdr->inode, 5395 .state = hdr->args.context->state, 5396 .stateid = &hdr->args.stateid, 5397 }; 5398 task->tk_status = nfs4_async_handle_exception(task, 5399 server, task->tk_status, &exception); 5400 if (exception.retry) { 5401 rpc_restart_call_prepare(task); 5402 return -EAGAIN; 5403 } 5404 } 5405 5406 if (task->tk_status > 0) 5407 renew_lease(server, hdr->timestamp); 5408 return 0; 5409 } 5410 5411 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5412 struct nfs_pgio_args *args) 5413 { 5414 5415 if (!nfs4_error_stateid_expired(task->tk_status) || 5416 nfs4_stateid_is_current(&args->stateid, 5417 args->context, 5418 args->lock_context, 5419 FMODE_READ)) 5420 return false; 5421 rpc_restart_call_prepare(task); 5422 return true; 5423 } 5424 5425 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5426 struct nfs_pgio_header *hdr) 5427 { 5428 struct nfs_server *server = NFS_SERVER(hdr->inode); 5429 struct rpc_message *msg = &task->tk_msg; 5430 5431 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5432 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5433 server->caps &= ~NFS_CAP_READ_PLUS; 5434 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5435 rpc_restart_call_prepare(task); 5436 return true; 5437 } 5438 return false; 5439 } 5440 5441 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5442 { 5443 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5444 return -EAGAIN; 5445 if (nfs4_read_stateid_changed(task, &hdr->args)) 5446 return -EAGAIN; 5447 if (nfs4_read_plus_not_supported(task, hdr)) 5448 return -EAGAIN; 5449 if (task->tk_status > 0) 5450 nfs_invalidate_atime(hdr->inode); 5451 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5452 nfs4_read_done_cb(task, hdr); 5453 } 5454 5455 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5456 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5457 struct rpc_message *msg) 5458 { 5459 /* Note: We don't use READ_PLUS with pNFS yet */ 5460 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) 5461 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5462 } 5463 #else 5464 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5465 struct rpc_message *msg) 5466 { 5467 } 5468 #endif /* CONFIG_NFS_V4_2 */ 5469 5470 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5471 struct rpc_message *msg) 5472 { 5473 hdr->timestamp = jiffies; 5474 if (!hdr->pgio_done_cb) 5475 hdr->pgio_done_cb = nfs4_read_done_cb; 5476 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5477 nfs42_read_plus_support(hdr, msg); 5478 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5479 } 5480 5481 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5482 struct nfs_pgio_header *hdr) 5483 { 5484 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5485 &hdr->args.seq_args, 5486 &hdr->res.seq_res, 5487 task)) 5488 return 0; 5489 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5490 hdr->args.lock_context, 5491 hdr->rw_mode) == -EIO) 5492 return -EIO; 5493 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5494 return -EIO; 5495 return 0; 5496 } 5497 5498 static int nfs4_write_done_cb(struct rpc_task *task, 5499 struct nfs_pgio_header *hdr) 5500 { 5501 struct inode *inode = hdr->inode; 5502 5503 trace_nfs4_write(hdr, task->tk_status); 5504 if (task->tk_status < 0) { 5505 struct nfs4_exception exception = { 5506 .inode = hdr->inode, 5507 .state = hdr->args.context->state, 5508 .stateid = &hdr->args.stateid, 5509 }; 5510 task->tk_status = nfs4_async_handle_exception(task, 5511 NFS_SERVER(inode), task->tk_status, 5512 &exception); 5513 if (exception.retry) { 5514 rpc_restart_call_prepare(task); 5515 return -EAGAIN; 5516 } 5517 } 5518 if (task->tk_status >= 0) { 5519 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5520 nfs_writeback_update_inode(hdr); 5521 } 5522 return 0; 5523 } 5524 5525 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5526 struct nfs_pgio_args *args) 5527 { 5528 5529 if (!nfs4_error_stateid_expired(task->tk_status) || 5530 nfs4_stateid_is_current(&args->stateid, 5531 args->context, 5532 args->lock_context, 5533 FMODE_WRITE)) 5534 return false; 5535 rpc_restart_call_prepare(task); 5536 return true; 5537 } 5538 5539 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5540 { 5541 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5542 return -EAGAIN; 5543 if (nfs4_write_stateid_changed(task, &hdr->args)) 5544 return -EAGAIN; 5545 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5546 nfs4_write_done_cb(task, hdr); 5547 } 5548 5549 static 5550 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5551 { 5552 /* Don't request attributes for pNFS or O_DIRECT writes */ 5553 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5554 return false; 5555 /* Otherwise, request attributes if and only if we don't hold 5556 * a delegation 5557 */ 5558 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5559 } 5560 5561 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5562 struct inode *inode, unsigned long cache_validity) 5563 { 5564 struct nfs_server *server = NFS_SERVER(inode); 5565 unsigned int i; 5566 5567 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5568 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5569 5570 if (cache_validity & NFS_INO_INVALID_CHANGE) 5571 bitmask[0] |= FATTR4_WORD0_CHANGE; 5572 if (cache_validity & NFS_INO_INVALID_ATIME) 5573 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5574 if (cache_validity & NFS_INO_INVALID_MODE) 5575 bitmask[1] |= FATTR4_WORD1_MODE; 5576 if (cache_validity & NFS_INO_INVALID_OTHER) 5577 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5578 if (cache_validity & NFS_INO_INVALID_NLINK) 5579 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5580 if (cache_validity & NFS_INO_INVALID_CTIME) 5581 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5582 if (cache_validity & NFS_INO_INVALID_MTIME) 5583 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5584 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5585 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5586 5587 if (cache_validity & NFS_INO_INVALID_SIZE) 5588 bitmask[0] |= FATTR4_WORD0_SIZE; 5589 5590 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5591 bitmask[i] &= server->attr_bitmask[i]; 5592 } 5593 5594 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5595 struct rpc_message *msg, 5596 struct rpc_clnt **clnt) 5597 { 5598 struct nfs_server *server = NFS_SERVER(hdr->inode); 5599 5600 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5601 hdr->args.bitmask = NULL; 5602 hdr->res.fattr = NULL; 5603 } else { 5604 nfs4_bitmask_set(hdr->args.bitmask_store, 5605 server->cache_consistency_bitmask, 5606 hdr->inode, NFS_INO_INVALID_BLOCKS); 5607 hdr->args.bitmask = hdr->args.bitmask_store; 5608 } 5609 5610 if (!hdr->pgio_done_cb) 5611 hdr->pgio_done_cb = nfs4_write_done_cb; 5612 hdr->res.server = server; 5613 hdr->timestamp = jiffies; 5614 5615 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5616 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5617 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5618 } 5619 5620 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5621 { 5622 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5623 &data->args.seq_args, 5624 &data->res.seq_res, 5625 task); 5626 } 5627 5628 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5629 { 5630 struct inode *inode = data->inode; 5631 5632 trace_nfs4_commit(data, task->tk_status); 5633 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5634 NULL, NULL) == -EAGAIN) { 5635 rpc_restart_call_prepare(task); 5636 return -EAGAIN; 5637 } 5638 return 0; 5639 } 5640 5641 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5642 { 5643 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5644 return -EAGAIN; 5645 return data->commit_done_cb(task, data); 5646 } 5647 5648 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5649 struct rpc_clnt **clnt) 5650 { 5651 struct nfs_server *server = NFS_SERVER(data->inode); 5652 5653 if (data->commit_done_cb == NULL) 5654 data->commit_done_cb = nfs4_commit_done_cb; 5655 data->res.server = server; 5656 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5657 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5658 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5659 } 5660 5661 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5662 struct nfs_commitres *res) 5663 { 5664 struct inode *dst_inode = file_inode(dst); 5665 struct nfs_server *server = NFS_SERVER(dst_inode); 5666 struct rpc_message msg = { 5667 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5668 .rpc_argp = args, 5669 .rpc_resp = res, 5670 }; 5671 5672 args->fh = NFS_FH(dst_inode); 5673 return nfs4_call_sync(server->client, server, &msg, 5674 &args->seq_args, &res->seq_res, 1); 5675 } 5676 5677 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5678 { 5679 struct nfs_commitargs args = { 5680 .offset = offset, 5681 .count = count, 5682 }; 5683 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5684 struct nfs4_exception exception = { }; 5685 int status; 5686 5687 do { 5688 status = _nfs4_proc_commit(dst, &args, res); 5689 status = nfs4_handle_exception(dst_server, status, &exception); 5690 } while (exception.retry); 5691 5692 return status; 5693 } 5694 5695 struct nfs4_renewdata { 5696 struct nfs_client *client; 5697 unsigned long timestamp; 5698 }; 5699 5700 /* 5701 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5702 * standalone procedure for queueing an asynchronous RENEW. 5703 */ 5704 static void nfs4_renew_release(void *calldata) 5705 { 5706 struct nfs4_renewdata *data = calldata; 5707 struct nfs_client *clp = data->client; 5708 5709 if (refcount_read(&clp->cl_count) > 1) 5710 nfs4_schedule_state_renewal(clp); 5711 nfs_put_client(clp); 5712 kfree(data); 5713 } 5714 5715 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5716 { 5717 struct nfs4_renewdata *data = calldata; 5718 struct nfs_client *clp = data->client; 5719 unsigned long timestamp = data->timestamp; 5720 5721 trace_nfs4_renew_async(clp, task->tk_status); 5722 switch (task->tk_status) { 5723 case 0: 5724 break; 5725 case -NFS4ERR_LEASE_MOVED: 5726 nfs4_schedule_lease_moved_recovery(clp); 5727 break; 5728 default: 5729 /* Unless we're shutting down, schedule state recovery! */ 5730 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5731 return; 5732 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5733 nfs4_schedule_lease_recovery(clp); 5734 return; 5735 } 5736 nfs4_schedule_path_down_recovery(clp); 5737 } 5738 do_renew_lease(clp, timestamp); 5739 } 5740 5741 static const struct rpc_call_ops nfs4_renew_ops = { 5742 .rpc_call_done = nfs4_renew_done, 5743 .rpc_release = nfs4_renew_release, 5744 }; 5745 5746 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5747 { 5748 struct rpc_message msg = { 5749 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5750 .rpc_argp = clp, 5751 .rpc_cred = cred, 5752 }; 5753 struct nfs4_renewdata *data; 5754 5755 if (renew_flags == 0) 5756 return 0; 5757 if (!refcount_inc_not_zero(&clp->cl_count)) 5758 return -EIO; 5759 data = kmalloc(sizeof(*data), GFP_NOFS); 5760 if (data == NULL) { 5761 nfs_put_client(clp); 5762 return -ENOMEM; 5763 } 5764 data->client = clp; 5765 data->timestamp = jiffies; 5766 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5767 &nfs4_renew_ops, data); 5768 } 5769 5770 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5771 { 5772 struct rpc_message msg = { 5773 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5774 .rpc_argp = clp, 5775 .rpc_cred = cred, 5776 }; 5777 unsigned long now = jiffies; 5778 int status; 5779 5780 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5781 if (status < 0) 5782 return status; 5783 do_renew_lease(clp, now); 5784 return 0; 5785 } 5786 5787 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5788 enum nfs4_acl_type type) 5789 { 5790 switch (type) { 5791 default: 5792 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5793 case NFS4ACL_DACL: 5794 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5795 case NFS4ACL_SACL: 5796 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5797 } 5798 } 5799 5800 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5801 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5802 * the stack. 5803 */ 5804 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5805 5806 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5807 struct page **pages) 5808 { 5809 struct page *newpage, **spages; 5810 int rc = 0; 5811 size_t len; 5812 spages = pages; 5813 5814 do { 5815 len = min_t(size_t, PAGE_SIZE, buflen); 5816 newpage = alloc_page(GFP_KERNEL); 5817 5818 if (newpage == NULL) 5819 goto unwind; 5820 memcpy(page_address(newpage), buf, len); 5821 buf += len; 5822 buflen -= len; 5823 *pages++ = newpage; 5824 rc++; 5825 } while (buflen != 0); 5826 5827 return rc; 5828 5829 unwind: 5830 for(; rc > 0; rc--) 5831 __free_page(spages[rc-1]); 5832 return -ENOMEM; 5833 } 5834 5835 struct nfs4_cached_acl { 5836 enum nfs4_acl_type type; 5837 int cached; 5838 size_t len; 5839 char data[]; 5840 }; 5841 5842 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5843 { 5844 struct nfs_inode *nfsi = NFS_I(inode); 5845 5846 spin_lock(&inode->i_lock); 5847 kfree(nfsi->nfs4_acl); 5848 nfsi->nfs4_acl = acl; 5849 spin_unlock(&inode->i_lock); 5850 } 5851 5852 static void nfs4_zap_acl_attr(struct inode *inode) 5853 { 5854 nfs4_set_cached_acl(inode, NULL); 5855 } 5856 5857 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5858 size_t buflen, enum nfs4_acl_type type) 5859 { 5860 struct nfs_inode *nfsi = NFS_I(inode); 5861 struct nfs4_cached_acl *acl; 5862 int ret = -ENOENT; 5863 5864 spin_lock(&inode->i_lock); 5865 acl = nfsi->nfs4_acl; 5866 if (acl == NULL) 5867 goto out; 5868 if (acl->type != type) 5869 goto out; 5870 if (buf == NULL) /* user is just asking for length */ 5871 goto out_len; 5872 if (acl->cached == 0) 5873 goto out; 5874 ret = -ERANGE; /* see getxattr(2) man page */ 5875 if (acl->len > buflen) 5876 goto out; 5877 memcpy(buf, acl->data, acl->len); 5878 out_len: 5879 ret = acl->len; 5880 out: 5881 spin_unlock(&inode->i_lock); 5882 return ret; 5883 } 5884 5885 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5886 size_t pgbase, size_t acl_len, 5887 enum nfs4_acl_type type) 5888 { 5889 struct nfs4_cached_acl *acl; 5890 size_t buflen = sizeof(*acl) + acl_len; 5891 5892 if (buflen <= PAGE_SIZE) { 5893 acl = kmalloc(buflen, GFP_KERNEL); 5894 if (acl == NULL) 5895 goto out; 5896 acl->cached = 1; 5897 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5898 } else { 5899 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5900 if (acl == NULL) 5901 goto out; 5902 acl->cached = 0; 5903 } 5904 acl->type = type; 5905 acl->len = acl_len; 5906 out: 5907 nfs4_set_cached_acl(inode, acl); 5908 } 5909 5910 /* 5911 * The getxattr API returns the required buffer length when called with a 5912 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5913 * the required buf. On a NULL buf, we send a page of data to the server 5914 * guessing that the ACL request can be serviced by a page. If so, we cache 5915 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5916 * the cache. If not so, we throw away the page, and cache the required 5917 * length. The next getxattr call will then produce another round trip to 5918 * the server, this time with the input buf of the required size. 5919 */ 5920 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5921 size_t buflen, enum nfs4_acl_type type) 5922 { 5923 struct page **pages; 5924 struct nfs_getaclargs args = { 5925 .fh = NFS_FH(inode), 5926 .acl_type = type, 5927 .acl_len = buflen, 5928 }; 5929 struct nfs_getaclres res = { 5930 .acl_type = type, 5931 .acl_len = buflen, 5932 }; 5933 struct rpc_message msg = { 5934 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5935 .rpc_argp = &args, 5936 .rpc_resp = &res, 5937 }; 5938 unsigned int npages; 5939 int ret = -ENOMEM, i; 5940 struct nfs_server *server = NFS_SERVER(inode); 5941 5942 if (buflen == 0) 5943 buflen = server->rsize; 5944 5945 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5946 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5947 if (!pages) 5948 return -ENOMEM; 5949 5950 args.acl_pages = pages; 5951 5952 for (i = 0; i < npages; i++) { 5953 pages[i] = alloc_page(GFP_KERNEL); 5954 if (!pages[i]) 5955 goto out_free; 5956 } 5957 5958 /* for decoding across pages */ 5959 res.acl_scratch = alloc_page(GFP_KERNEL); 5960 if (!res.acl_scratch) 5961 goto out_free; 5962 5963 args.acl_len = npages * PAGE_SIZE; 5964 5965 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5966 __func__, buf, buflen, npages, args.acl_len); 5967 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5968 &msg, &args.seq_args, &res.seq_res, 0); 5969 if (ret) 5970 goto out_free; 5971 5972 /* Handle the case where the passed-in buffer is too short */ 5973 if (res.acl_flags & NFS4_ACL_TRUNC) { 5974 /* Did the user only issue a request for the acl length? */ 5975 if (buf == NULL) 5976 goto out_ok; 5977 ret = -ERANGE; 5978 goto out_free; 5979 } 5980 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5981 type); 5982 if (buf) { 5983 if (res.acl_len > buflen) { 5984 ret = -ERANGE; 5985 goto out_free; 5986 } 5987 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5988 } 5989 out_ok: 5990 ret = res.acl_len; 5991 out_free: 5992 for (i = 0; i < npages; i++) 5993 if (pages[i]) 5994 __free_page(pages[i]); 5995 if (res.acl_scratch) 5996 __free_page(res.acl_scratch); 5997 kfree(pages); 5998 return ret; 5999 } 6000 6001 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6002 size_t buflen, enum nfs4_acl_type type) 6003 { 6004 struct nfs4_exception exception = { 6005 .interruptible = true, 6006 }; 6007 ssize_t ret; 6008 do { 6009 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6010 trace_nfs4_get_acl(inode, ret); 6011 if (ret >= 0) 6012 break; 6013 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6014 } while (exception.retry); 6015 return ret; 6016 } 6017 6018 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6019 enum nfs4_acl_type type) 6020 { 6021 struct nfs_server *server = NFS_SERVER(inode); 6022 int ret; 6023 6024 if (!nfs4_server_supports_acls(server, type)) 6025 return -EOPNOTSUPP; 6026 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6027 if (ret < 0) 6028 return ret; 6029 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6030 nfs_zap_acl_cache(inode); 6031 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6032 if (ret != -ENOENT) 6033 /* -ENOENT is returned if there is no ACL or if there is an ACL 6034 * but no cached acl data, just the acl length */ 6035 return ret; 6036 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6037 } 6038 6039 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6040 size_t buflen, enum nfs4_acl_type type) 6041 { 6042 struct nfs_server *server = NFS_SERVER(inode); 6043 struct page *pages[NFS4ACL_MAXPAGES]; 6044 struct nfs_setaclargs arg = { 6045 .fh = NFS_FH(inode), 6046 .acl_type = type, 6047 .acl_len = buflen, 6048 .acl_pages = pages, 6049 }; 6050 struct nfs_setaclres res; 6051 struct rpc_message msg = { 6052 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6053 .rpc_argp = &arg, 6054 .rpc_resp = &res, 6055 }; 6056 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6057 int ret, i; 6058 6059 /* You can't remove system.nfs4_acl: */ 6060 if (buflen == 0) 6061 return -EINVAL; 6062 if (!nfs4_server_supports_acls(server, type)) 6063 return -EOPNOTSUPP; 6064 if (npages > ARRAY_SIZE(pages)) 6065 return -ERANGE; 6066 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6067 if (i < 0) 6068 return i; 6069 nfs4_inode_make_writeable(inode); 6070 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6071 6072 /* 6073 * Free each page after tx, so the only ref left is 6074 * held by the network stack 6075 */ 6076 for (; i > 0; i--) 6077 put_page(pages[i-1]); 6078 6079 /* 6080 * Acl update can result in inode attribute update. 6081 * so mark the attribute cache invalid. 6082 */ 6083 spin_lock(&inode->i_lock); 6084 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6085 NFS_INO_INVALID_CTIME | 6086 NFS_INO_REVAL_FORCED); 6087 spin_unlock(&inode->i_lock); 6088 nfs_access_zap_cache(inode); 6089 nfs_zap_acl_cache(inode); 6090 return ret; 6091 } 6092 6093 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6094 size_t buflen, enum nfs4_acl_type type) 6095 { 6096 struct nfs4_exception exception = { }; 6097 int err; 6098 do { 6099 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6100 trace_nfs4_set_acl(inode, err); 6101 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6102 /* 6103 * no need to retry since the kernel 6104 * isn't involved in encoding the ACEs. 6105 */ 6106 err = -EINVAL; 6107 break; 6108 } 6109 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6110 &exception); 6111 } while (exception.retry); 6112 return err; 6113 } 6114 6115 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6116 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6117 size_t buflen) 6118 { 6119 struct nfs_server *server = NFS_SERVER(inode); 6120 struct nfs4_label label = {0, 0, buflen, buf}; 6121 6122 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6123 struct nfs_fattr fattr = { 6124 .label = &label, 6125 }; 6126 struct nfs4_getattr_arg arg = { 6127 .fh = NFS_FH(inode), 6128 .bitmask = bitmask, 6129 }; 6130 struct nfs4_getattr_res res = { 6131 .fattr = &fattr, 6132 .server = server, 6133 }; 6134 struct rpc_message msg = { 6135 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6136 .rpc_argp = &arg, 6137 .rpc_resp = &res, 6138 }; 6139 int ret; 6140 6141 nfs_fattr_init(&fattr); 6142 6143 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6144 if (ret) 6145 return ret; 6146 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6147 return -ENOENT; 6148 return label.len; 6149 } 6150 6151 static int nfs4_get_security_label(struct inode *inode, void *buf, 6152 size_t buflen) 6153 { 6154 struct nfs4_exception exception = { 6155 .interruptible = true, 6156 }; 6157 int err; 6158 6159 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6160 return -EOPNOTSUPP; 6161 6162 do { 6163 err = _nfs4_get_security_label(inode, buf, buflen); 6164 trace_nfs4_get_security_label(inode, err); 6165 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6166 &exception); 6167 } while (exception.retry); 6168 return err; 6169 } 6170 6171 static int _nfs4_do_set_security_label(struct inode *inode, 6172 struct nfs4_label *ilabel, 6173 struct nfs_fattr *fattr) 6174 { 6175 6176 struct iattr sattr = {0}; 6177 struct nfs_server *server = NFS_SERVER(inode); 6178 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6179 struct nfs_setattrargs arg = { 6180 .fh = NFS_FH(inode), 6181 .iap = &sattr, 6182 .server = server, 6183 .bitmask = bitmask, 6184 .label = ilabel, 6185 }; 6186 struct nfs_setattrres res = { 6187 .fattr = fattr, 6188 .server = server, 6189 }; 6190 struct rpc_message msg = { 6191 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6192 .rpc_argp = &arg, 6193 .rpc_resp = &res, 6194 }; 6195 int status; 6196 6197 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6198 6199 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6200 if (status) 6201 dprintk("%s failed: %d\n", __func__, status); 6202 6203 return status; 6204 } 6205 6206 static int nfs4_do_set_security_label(struct inode *inode, 6207 struct nfs4_label *ilabel, 6208 struct nfs_fattr *fattr) 6209 { 6210 struct nfs4_exception exception = { }; 6211 int err; 6212 6213 do { 6214 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6215 trace_nfs4_set_security_label(inode, err); 6216 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6217 &exception); 6218 } while (exception.retry); 6219 return err; 6220 } 6221 6222 static int 6223 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6224 { 6225 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6226 struct nfs_fattr *fattr; 6227 int status; 6228 6229 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6230 return -EOPNOTSUPP; 6231 6232 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6233 if (fattr == NULL) 6234 return -ENOMEM; 6235 6236 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6237 if (status == 0) 6238 nfs_setsecurity(inode, fattr); 6239 6240 return status; 6241 } 6242 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6243 6244 6245 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6246 nfs4_verifier *bootverf) 6247 { 6248 __be32 verf[2]; 6249 6250 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6251 /* An impossible timestamp guarantees this value 6252 * will never match a generated boot time. */ 6253 verf[0] = cpu_to_be32(U32_MAX); 6254 verf[1] = cpu_to_be32(U32_MAX); 6255 } else { 6256 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6257 u64 ns = ktime_to_ns(nn->boot_time); 6258 6259 verf[0] = cpu_to_be32(ns >> 32); 6260 verf[1] = cpu_to_be32(ns); 6261 } 6262 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6263 } 6264 6265 static size_t 6266 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6267 { 6268 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6269 struct nfs_netns_client *nn_clp = nn->nfs_client; 6270 const char *id; 6271 6272 buf[0] = '\0'; 6273 6274 if (nn_clp) { 6275 rcu_read_lock(); 6276 id = rcu_dereference(nn_clp->identifier); 6277 if (id) 6278 strscpy(buf, id, buflen); 6279 rcu_read_unlock(); 6280 } 6281 6282 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6283 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6284 6285 return strlen(buf); 6286 } 6287 6288 static int 6289 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6290 { 6291 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6292 size_t buflen; 6293 size_t len; 6294 char *str; 6295 6296 if (clp->cl_owner_id != NULL) 6297 return 0; 6298 6299 rcu_read_lock(); 6300 len = 14 + 6301 strlen(clp->cl_rpcclient->cl_nodename) + 6302 1 + 6303 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6304 1; 6305 rcu_read_unlock(); 6306 6307 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6308 if (buflen) 6309 len += buflen + 1; 6310 6311 if (len > NFS4_OPAQUE_LIMIT + 1) 6312 return -EINVAL; 6313 6314 /* 6315 * Since this string is allocated at mount time, and held until the 6316 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6317 * about a memory-reclaim deadlock. 6318 */ 6319 str = kmalloc(len, GFP_KERNEL); 6320 if (!str) 6321 return -ENOMEM; 6322 6323 rcu_read_lock(); 6324 if (buflen) 6325 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6326 clp->cl_rpcclient->cl_nodename, buf, 6327 rpc_peeraddr2str(clp->cl_rpcclient, 6328 RPC_DISPLAY_ADDR)); 6329 else 6330 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6331 clp->cl_rpcclient->cl_nodename, 6332 rpc_peeraddr2str(clp->cl_rpcclient, 6333 RPC_DISPLAY_ADDR)); 6334 rcu_read_unlock(); 6335 6336 clp->cl_owner_id = str; 6337 return 0; 6338 } 6339 6340 static int 6341 nfs4_init_uniform_client_string(struct nfs_client *clp) 6342 { 6343 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6344 size_t buflen; 6345 size_t len; 6346 char *str; 6347 6348 if (clp->cl_owner_id != NULL) 6349 return 0; 6350 6351 len = 10 + 10 + 1 + 10 + 1 + 6352 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6353 6354 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6355 if (buflen) 6356 len += buflen + 1; 6357 6358 if (len > NFS4_OPAQUE_LIMIT + 1) 6359 return -EINVAL; 6360 6361 /* 6362 * Since this string is allocated at mount time, and held until the 6363 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6364 * about a memory-reclaim deadlock. 6365 */ 6366 str = kmalloc(len, GFP_KERNEL); 6367 if (!str) 6368 return -ENOMEM; 6369 6370 if (buflen) 6371 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6372 clp->rpc_ops->version, clp->cl_minorversion, 6373 buf, clp->cl_rpcclient->cl_nodename); 6374 else 6375 scnprintf(str, len, "Linux NFSv%u.%u %s", 6376 clp->rpc_ops->version, clp->cl_minorversion, 6377 clp->cl_rpcclient->cl_nodename); 6378 clp->cl_owner_id = str; 6379 return 0; 6380 } 6381 6382 /* 6383 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6384 * services. Advertise one based on the address family of the 6385 * clientaddr. 6386 */ 6387 static unsigned int 6388 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6389 { 6390 if (strchr(clp->cl_ipaddr, ':') != NULL) 6391 return scnprintf(buf, len, "tcp6"); 6392 else 6393 return scnprintf(buf, len, "tcp"); 6394 } 6395 6396 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6397 { 6398 struct nfs4_setclientid *sc = calldata; 6399 6400 if (task->tk_status == 0) 6401 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6402 } 6403 6404 static const struct rpc_call_ops nfs4_setclientid_ops = { 6405 .rpc_call_done = nfs4_setclientid_done, 6406 }; 6407 6408 /** 6409 * nfs4_proc_setclientid - Negotiate client ID 6410 * @clp: state data structure 6411 * @program: RPC program for NFSv4 callback service 6412 * @port: IP port number for NFS4 callback service 6413 * @cred: credential to use for this call 6414 * @res: where to place the result 6415 * 6416 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6417 */ 6418 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6419 unsigned short port, const struct cred *cred, 6420 struct nfs4_setclientid_res *res) 6421 { 6422 nfs4_verifier sc_verifier; 6423 struct nfs4_setclientid setclientid = { 6424 .sc_verifier = &sc_verifier, 6425 .sc_prog = program, 6426 .sc_clnt = clp, 6427 }; 6428 struct rpc_message msg = { 6429 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6430 .rpc_argp = &setclientid, 6431 .rpc_resp = res, 6432 .rpc_cred = cred, 6433 }; 6434 struct rpc_task_setup task_setup_data = { 6435 .rpc_client = clp->cl_rpcclient, 6436 .rpc_message = &msg, 6437 .callback_ops = &nfs4_setclientid_ops, 6438 .callback_data = &setclientid, 6439 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6440 }; 6441 unsigned long now = jiffies; 6442 int status; 6443 6444 /* nfs_client_id4 */ 6445 nfs4_init_boot_verifier(clp, &sc_verifier); 6446 6447 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6448 status = nfs4_init_uniform_client_string(clp); 6449 else 6450 status = nfs4_init_nonuniform_client_string(clp); 6451 6452 if (status) 6453 goto out; 6454 6455 /* cb_client4 */ 6456 setclientid.sc_netid_len = 6457 nfs4_init_callback_netid(clp, 6458 setclientid.sc_netid, 6459 sizeof(setclientid.sc_netid)); 6460 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6461 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6462 clp->cl_ipaddr, port >> 8, port & 255); 6463 6464 dprintk("NFS call setclientid auth=%s, '%s'\n", 6465 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6466 clp->cl_owner_id); 6467 6468 status = nfs4_call_sync_custom(&task_setup_data); 6469 if (setclientid.sc_cred) { 6470 kfree(clp->cl_acceptor); 6471 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6472 put_rpccred(setclientid.sc_cred); 6473 } 6474 6475 if (status == 0) 6476 do_renew_lease(clp, now); 6477 out: 6478 trace_nfs4_setclientid(clp, status); 6479 dprintk("NFS reply setclientid: %d\n", status); 6480 return status; 6481 } 6482 6483 /** 6484 * nfs4_proc_setclientid_confirm - Confirm client ID 6485 * @clp: state data structure 6486 * @arg: result of a previous SETCLIENTID 6487 * @cred: credential to use for this call 6488 * 6489 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6490 */ 6491 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6492 struct nfs4_setclientid_res *arg, 6493 const struct cred *cred) 6494 { 6495 struct rpc_message msg = { 6496 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6497 .rpc_argp = arg, 6498 .rpc_cred = cred, 6499 }; 6500 int status; 6501 6502 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6503 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6504 clp->cl_clientid); 6505 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6506 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6507 trace_nfs4_setclientid_confirm(clp, status); 6508 dprintk("NFS reply setclientid_confirm: %d\n", status); 6509 return status; 6510 } 6511 6512 struct nfs4_delegreturndata { 6513 struct nfs4_delegreturnargs args; 6514 struct nfs4_delegreturnres res; 6515 struct nfs_fh fh; 6516 nfs4_stateid stateid; 6517 unsigned long timestamp; 6518 struct { 6519 struct nfs4_layoutreturn_args arg; 6520 struct nfs4_layoutreturn_res res; 6521 struct nfs4_xdr_opaque_data ld_private; 6522 u32 roc_barrier; 6523 bool roc; 6524 } lr; 6525 struct nfs_fattr fattr; 6526 int rpc_status; 6527 struct inode *inode; 6528 }; 6529 6530 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6531 { 6532 struct nfs4_delegreturndata *data = calldata; 6533 struct nfs4_exception exception = { 6534 .inode = data->inode, 6535 .stateid = &data->stateid, 6536 .task_is_privileged = data->args.seq_args.sa_privileged, 6537 }; 6538 6539 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6540 return; 6541 6542 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6543 6544 /* Handle Layoutreturn errors */ 6545 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6546 &data->res.lr_ret) == -EAGAIN) 6547 goto out_restart; 6548 6549 switch (task->tk_status) { 6550 case 0: 6551 renew_lease(data->res.server, data->timestamp); 6552 break; 6553 case -NFS4ERR_ADMIN_REVOKED: 6554 case -NFS4ERR_DELEG_REVOKED: 6555 case -NFS4ERR_EXPIRED: 6556 nfs4_free_revoked_stateid(data->res.server, 6557 data->args.stateid, 6558 task->tk_msg.rpc_cred); 6559 fallthrough; 6560 case -NFS4ERR_BAD_STATEID: 6561 case -NFS4ERR_STALE_STATEID: 6562 case -ETIMEDOUT: 6563 task->tk_status = 0; 6564 break; 6565 case -NFS4ERR_OLD_STATEID: 6566 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6567 nfs4_stateid_seqid_inc(&data->stateid); 6568 if (data->args.bitmask) { 6569 data->args.bitmask = NULL; 6570 data->res.fattr = NULL; 6571 } 6572 goto out_restart; 6573 case -NFS4ERR_ACCESS: 6574 if (data->args.bitmask) { 6575 data->args.bitmask = NULL; 6576 data->res.fattr = NULL; 6577 goto out_restart; 6578 } 6579 fallthrough; 6580 default: 6581 task->tk_status = nfs4_async_handle_exception(task, 6582 data->res.server, task->tk_status, 6583 &exception); 6584 if (exception.retry) 6585 goto out_restart; 6586 } 6587 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6588 data->rpc_status = task->tk_status; 6589 return; 6590 out_restart: 6591 task->tk_status = 0; 6592 rpc_restart_call_prepare(task); 6593 } 6594 6595 static void nfs4_delegreturn_release(void *calldata) 6596 { 6597 struct nfs4_delegreturndata *data = calldata; 6598 struct inode *inode = data->inode; 6599 6600 if (data->lr.roc) 6601 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6602 data->res.lr_ret); 6603 if (inode) { 6604 nfs4_fattr_set_prechange(&data->fattr, 6605 inode_peek_iversion_raw(inode)); 6606 nfs_refresh_inode(inode, &data->fattr); 6607 nfs_iput_and_deactive(inode); 6608 } 6609 kfree(calldata); 6610 } 6611 6612 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6613 { 6614 struct nfs4_delegreturndata *d_data; 6615 struct pnfs_layout_hdr *lo; 6616 6617 d_data = data; 6618 6619 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6620 nfs4_sequence_done(task, &d_data->res.seq_res); 6621 return; 6622 } 6623 6624 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6625 if (lo && !pnfs_layout_is_valid(lo)) { 6626 d_data->args.lr_args = NULL; 6627 d_data->res.lr_res = NULL; 6628 } 6629 6630 nfs4_setup_sequence(d_data->res.server->nfs_client, 6631 &d_data->args.seq_args, 6632 &d_data->res.seq_res, 6633 task); 6634 } 6635 6636 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6637 .rpc_call_prepare = nfs4_delegreturn_prepare, 6638 .rpc_call_done = nfs4_delegreturn_done, 6639 .rpc_release = nfs4_delegreturn_release, 6640 }; 6641 6642 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6643 { 6644 struct nfs4_delegreturndata *data; 6645 struct nfs_server *server = NFS_SERVER(inode); 6646 struct rpc_task *task; 6647 struct rpc_message msg = { 6648 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6649 .rpc_cred = cred, 6650 }; 6651 struct rpc_task_setup task_setup_data = { 6652 .rpc_client = server->client, 6653 .rpc_message = &msg, 6654 .callback_ops = &nfs4_delegreturn_ops, 6655 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6656 }; 6657 int status = 0; 6658 6659 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6660 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6661 6662 data = kzalloc(sizeof(*data), GFP_KERNEL); 6663 if (data == NULL) 6664 return -ENOMEM; 6665 6666 nfs4_state_protect(server->nfs_client, 6667 NFS_SP4_MACH_CRED_CLEANUP, 6668 &task_setup_data.rpc_client, &msg); 6669 6670 data->args.fhandle = &data->fh; 6671 data->args.stateid = &data->stateid; 6672 nfs4_bitmask_set(data->args.bitmask_store, 6673 server->cache_consistency_bitmask, inode, 0); 6674 data->args.bitmask = data->args.bitmask_store; 6675 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6676 nfs4_stateid_copy(&data->stateid, stateid); 6677 data->res.fattr = &data->fattr; 6678 data->res.server = server; 6679 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6680 data->lr.arg.ld_private = &data->lr.ld_private; 6681 nfs_fattr_init(data->res.fattr); 6682 data->timestamp = jiffies; 6683 data->rpc_status = 0; 6684 data->inode = nfs_igrab_and_active(inode); 6685 if (data->inode || issync) { 6686 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6687 cred); 6688 if (data->lr.roc) { 6689 data->args.lr_args = &data->lr.arg; 6690 data->res.lr_res = &data->lr.res; 6691 } 6692 } 6693 6694 if (!data->inode) 6695 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6696 1); 6697 else 6698 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6699 0); 6700 task_setup_data.callback_data = data; 6701 msg.rpc_argp = &data->args; 6702 msg.rpc_resp = &data->res; 6703 task = rpc_run_task(&task_setup_data); 6704 if (IS_ERR(task)) 6705 return PTR_ERR(task); 6706 if (!issync) 6707 goto out; 6708 status = rpc_wait_for_completion_task(task); 6709 if (status != 0) 6710 goto out; 6711 status = data->rpc_status; 6712 out: 6713 rpc_put_task(task); 6714 return status; 6715 } 6716 6717 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6718 { 6719 struct nfs_server *server = NFS_SERVER(inode); 6720 struct nfs4_exception exception = { }; 6721 int err; 6722 do { 6723 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6724 trace_nfs4_delegreturn(inode, stateid, err); 6725 switch (err) { 6726 case -NFS4ERR_STALE_STATEID: 6727 case -NFS4ERR_EXPIRED: 6728 case 0: 6729 return 0; 6730 } 6731 err = nfs4_handle_exception(server, err, &exception); 6732 } while (exception.retry); 6733 return err; 6734 } 6735 6736 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6737 { 6738 struct inode *inode = state->inode; 6739 struct nfs_server *server = NFS_SERVER(inode); 6740 struct nfs_client *clp = server->nfs_client; 6741 struct nfs_lockt_args arg = { 6742 .fh = NFS_FH(inode), 6743 .fl = request, 6744 }; 6745 struct nfs_lockt_res res = { 6746 .denied = request, 6747 }; 6748 struct rpc_message msg = { 6749 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6750 .rpc_argp = &arg, 6751 .rpc_resp = &res, 6752 .rpc_cred = state->owner->so_cred, 6753 }; 6754 struct nfs4_lock_state *lsp; 6755 int status; 6756 6757 arg.lock_owner.clientid = clp->cl_clientid; 6758 status = nfs4_set_lock_state(state, request); 6759 if (status != 0) 6760 goto out; 6761 lsp = request->fl_u.nfs4_fl.owner; 6762 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6763 arg.lock_owner.s_dev = server->s_dev; 6764 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6765 switch (status) { 6766 case 0: 6767 request->fl_type = F_UNLCK; 6768 break; 6769 case -NFS4ERR_DENIED: 6770 status = 0; 6771 } 6772 request->fl_ops->fl_release_private(request); 6773 request->fl_ops = NULL; 6774 out: 6775 return status; 6776 } 6777 6778 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6779 { 6780 struct nfs4_exception exception = { 6781 .interruptible = true, 6782 }; 6783 int err; 6784 6785 do { 6786 err = _nfs4_proc_getlk(state, cmd, request); 6787 trace_nfs4_get_lock(request, state, cmd, err); 6788 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6789 &exception); 6790 } while (exception.retry); 6791 return err; 6792 } 6793 6794 /* 6795 * Update the seqid of a lock stateid after receiving 6796 * NFS4ERR_OLD_STATEID 6797 */ 6798 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6799 struct nfs4_lock_state *lsp) 6800 { 6801 struct nfs4_state *state = lsp->ls_state; 6802 bool ret = false; 6803 6804 spin_lock(&state->state_lock); 6805 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6806 goto out; 6807 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6808 nfs4_stateid_seqid_inc(dst); 6809 else 6810 dst->seqid = lsp->ls_stateid.seqid; 6811 ret = true; 6812 out: 6813 spin_unlock(&state->state_lock); 6814 return ret; 6815 } 6816 6817 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6818 struct nfs4_lock_state *lsp) 6819 { 6820 struct nfs4_state *state = lsp->ls_state; 6821 bool ret; 6822 6823 spin_lock(&state->state_lock); 6824 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6825 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6826 spin_unlock(&state->state_lock); 6827 return ret; 6828 } 6829 6830 struct nfs4_unlockdata { 6831 struct nfs_locku_args arg; 6832 struct nfs_locku_res res; 6833 struct nfs4_lock_state *lsp; 6834 struct nfs_open_context *ctx; 6835 struct nfs_lock_context *l_ctx; 6836 struct file_lock fl; 6837 struct nfs_server *server; 6838 unsigned long timestamp; 6839 }; 6840 6841 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6842 struct nfs_open_context *ctx, 6843 struct nfs4_lock_state *lsp, 6844 struct nfs_seqid *seqid) 6845 { 6846 struct nfs4_unlockdata *p; 6847 struct nfs4_state *state = lsp->ls_state; 6848 struct inode *inode = state->inode; 6849 6850 p = kzalloc(sizeof(*p), GFP_KERNEL); 6851 if (p == NULL) 6852 return NULL; 6853 p->arg.fh = NFS_FH(inode); 6854 p->arg.fl = &p->fl; 6855 p->arg.seqid = seqid; 6856 p->res.seqid = seqid; 6857 p->lsp = lsp; 6858 /* Ensure we don't close file until we're done freeing locks! */ 6859 p->ctx = get_nfs_open_context(ctx); 6860 p->l_ctx = nfs_get_lock_context(ctx); 6861 locks_init_lock(&p->fl); 6862 locks_copy_lock(&p->fl, fl); 6863 p->server = NFS_SERVER(inode); 6864 spin_lock(&state->state_lock); 6865 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6866 spin_unlock(&state->state_lock); 6867 return p; 6868 } 6869 6870 static void nfs4_locku_release_calldata(void *data) 6871 { 6872 struct nfs4_unlockdata *calldata = data; 6873 nfs_free_seqid(calldata->arg.seqid); 6874 nfs4_put_lock_state(calldata->lsp); 6875 nfs_put_lock_context(calldata->l_ctx); 6876 put_nfs_open_context(calldata->ctx); 6877 kfree(calldata); 6878 } 6879 6880 static void nfs4_locku_done(struct rpc_task *task, void *data) 6881 { 6882 struct nfs4_unlockdata *calldata = data; 6883 struct nfs4_exception exception = { 6884 .inode = calldata->lsp->ls_state->inode, 6885 .stateid = &calldata->arg.stateid, 6886 }; 6887 6888 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6889 return; 6890 switch (task->tk_status) { 6891 case 0: 6892 renew_lease(calldata->server, calldata->timestamp); 6893 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6894 if (nfs4_update_lock_stateid(calldata->lsp, 6895 &calldata->res.stateid)) 6896 break; 6897 fallthrough; 6898 case -NFS4ERR_ADMIN_REVOKED: 6899 case -NFS4ERR_EXPIRED: 6900 nfs4_free_revoked_stateid(calldata->server, 6901 &calldata->arg.stateid, 6902 task->tk_msg.rpc_cred); 6903 fallthrough; 6904 case -NFS4ERR_BAD_STATEID: 6905 case -NFS4ERR_STALE_STATEID: 6906 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6907 calldata->lsp)) 6908 rpc_restart_call_prepare(task); 6909 break; 6910 case -NFS4ERR_OLD_STATEID: 6911 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6912 calldata->lsp)) 6913 rpc_restart_call_prepare(task); 6914 break; 6915 default: 6916 task->tk_status = nfs4_async_handle_exception(task, 6917 calldata->server, task->tk_status, 6918 &exception); 6919 if (exception.retry) 6920 rpc_restart_call_prepare(task); 6921 } 6922 nfs_release_seqid(calldata->arg.seqid); 6923 } 6924 6925 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6926 { 6927 struct nfs4_unlockdata *calldata = data; 6928 6929 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6930 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6931 return; 6932 6933 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6934 goto out_wait; 6935 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6936 /* Note: exit _without_ running nfs4_locku_done */ 6937 goto out_no_action; 6938 } 6939 calldata->timestamp = jiffies; 6940 if (nfs4_setup_sequence(calldata->server->nfs_client, 6941 &calldata->arg.seq_args, 6942 &calldata->res.seq_res, 6943 task) != 0) 6944 nfs_release_seqid(calldata->arg.seqid); 6945 return; 6946 out_no_action: 6947 task->tk_action = NULL; 6948 out_wait: 6949 nfs4_sequence_done(task, &calldata->res.seq_res); 6950 } 6951 6952 static const struct rpc_call_ops nfs4_locku_ops = { 6953 .rpc_call_prepare = nfs4_locku_prepare, 6954 .rpc_call_done = nfs4_locku_done, 6955 .rpc_release = nfs4_locku_release_calldata, 6956 }; 6957 6958 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6959 struct nfs_open_context *ctx, 6960 struct nfs4_lock_state *lsp, 6961 struct nfs_seqid *seqid) 6962 { 6963 struct nfs4_unlockdata *data; 6964 struct rpc_message msg = { 6965 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6966 .rpc_cred = ctx->cred, 6967 }; 6968 struct rpc_task_setup task_setup_data = { 6969 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6970 .rpc_message = &msg, 6971 .callback_ops = &nfs4_locku_ops, 6972 .workqueue = nfsiod_workqueue, 6973 .flags = RPC_TASK_ASYNC, 6974 }; 6975 6976 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6977 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6978 6979 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6980 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6981 6982 /* Ensure this is an unlock - when canceling a lock, the 6983 * canceled lock is passed in, and it won't be an unlock. 6984 */ 6985 fl->fl_type = F_UNLCK; 6986 if (fl->fl_flags & FL_CLOSE) 6987 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6988 6989 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6990 if (data == NULL) { 6991 nfs_free_seqid(seqid); 6992 return ERR_PTR(-ENOMEM); 6993 } 6994 6995 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6996 msg.rpc_argp = &data->arg; 6997 msg.rpc_resp = &data->res; 6998 task_setup_data.callback_data = data; 6999 return rpc_run_task(&task_setup_data); 7000 } 7001 7002 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7003 { 7004 struct inode *inode = state->inode; 7005 struct nfs4_state_owner *sp = state->owner; 7006 struct nfs_inode *nfsi = NFS_I(inode); 7007 struct nfs_seqid *seqid; 7008 struct nfs4_lock_state *lsp; 7009 struct rpc_task *task; 7010 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7011 int status = 0; 7012 unsigned char fl_flags = request->fl_flags; 7013 7014 status = nfs4_set_lock_state(state, request); 7015 /* Unlock _before_ we do the RPC call */ 7016 request->fl_flags |= FL_EXISTS; 7017 /* Exclude nfs_delegation_claim_locks() */ 7018 mutex_lock(&sp->so_delegreturn_mutex); 7019 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7020 down_read(&nfsi->rwsem); 7021 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7022 up_read(&nfsi->rwsem); 7023 mutex_unlock(&sp->so_delegreturn_mutex); 7024 goto out; 7025 } 7026 lsp = request->fl_u.nfs4_fl.owner; 7027 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7028 up_read(&nfsi->rwsem); 7029 mutex_unlock(&sp->so_delegreturn_mutex); 7030 if (status != 0) 7031 goto out; 7032 /* Is this a delegated lock? */ 7033 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7034 goto out; 7035 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7036 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7037 status = -ENOMEM; 7038 if (IS_ERR(seqid)) 7039 goto out; 7040 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7041 status = PTR_ERR(task); 7042 if (IS_ERR(task)) 7043 goto out; 7044 status = rpc_wait_for_completion_task(task); 7045 rpc_put_task(task); 7046 out: 7047 request->fl_flags = fl_flags; 7048 trace_nfs4_unlock(request, state, F_SETLK, status); 7049 return status; 7050 } 7051 7052 struct nfs4_lockdata { 7053 struct nfs_lock_args arg; 7054 struct nfs_lock_res res; 7055 struct nfs4_lock_state *lsp; 7056 struct nfs_open_context *ctx; 7057 struct file_lock fl; 7058 unsigned long timestamp; 7059 int rpc_status; 7060 int cancelled; 7061 struct nfs_server *server; 7062 }; 7063 7064 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7065 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7066 gfp_t gfp_mask) 7067 { 7068 struct nfs4_lockdata *p; 7069 struct inode *inode = lsp->ls_state->inode; 7070 struct nfs_server *server = NFS_SERVER(inode); 7071 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7072 7073 p = kzalloc(sizeof(*p), gfp_mask); 7074 if (p == NULL) 7075 return NULL; 7076 7077 p->arg.fh = NFS_FH(inode); 7078 p->arg.fl = &p->fl; 7079 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7080 if (IS_ERR(p->arg.open_seqid)) 7081 goto out_free; 7082 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7083 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7084 if (IS_ERR(p->arg.lock_seqid)) 7085 goto out_free_seqid; 7086 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7087 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7088 p->arg.lock_owner.s_dev = server->s_dev; 7089 p->res.lock_seqid = p->arg.lock_seqid; 7090 p->lsp = lsp; 7091 p->server = server; 7092 p->ctx = get_nfs_open_context(ctx); 7093 locks_init_lock(&p->fl); 7094 locks_copy_lock(&p->fl, fl); 7095 return p; 7096 out_free_seqid: 7097 nfs_free_seqid(p->arg.open_seqid); 7098 out_free: 7099 kfree(p); 7100 return NULL; 7101 } 7102 7103 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7104 { 7105 struct nfs4_lockdata *data = calldata; 7106 struct nfs4_state *state = data->lsp->ls_state; 7107 7108 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7109 goto out_wait; 7110 /* Do we need to do an open_to_lock_owner? */ 7111 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7112 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7113 goto out_release_lock_seqid; 7114 } 7115 nfs4_stateid_copy(&data->arg.open_stateid, 7116 &state->open_stateid); 7117 data->arg.new_lock_owner = 1; 7118 data->res.open_seqid = data->arg.open_seqid; 7119 } else { 7120 data->arg.new_lock_owner = 0; 7121 nfs4_stateid_copy(&data->arg.lock_stateid, 7122 &data->lsp->ls_stateid); 7123 } 7124 if (!nfs4_valid_open_stateid(state)) { 7125 data->rpc_status = -EBADF; 7126 task->tk_action = NULL; 7127 goto out_release_open_seqid; 7128 } 7129 data->timestamp = jiffies; 7130 if (nfs4_setup_sequence(data->server->nfs_client, 7131 &data->arg.seq_args, 7132 &data->res.seq_res, 7133 task) == 0) 7134 return; 7135 out_release_open_seqid: 7136 nfs_release_seqid(data->arg.open_seqid); 7137 out_release_lock_seqid: 7138 nfs_release_seqid(data->arg.lock_seqid); 7139 out_wait: 7140 nfs4_sequence_done(task, &data->res.seq_res); 7141 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7142 } 7143 7144 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7145 { 7146 struct nfs4_lockdata *data = calldata; 7147 struct nfs4_lock_state *lsp = data->lsp; 7148 struct nfs_server *server = NFS_SERVER(d_inode(data->ctx->dentry)); 7149 7150 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7151 return; 7152 7153 data->rpc_status = task->tk_status; 7154 switch (task->tk_status) { 7155 case 0: 7156 renew_lease(server, data->timestamp); 7157 if (data->arg.new_lock && !data->cancelled) { 7158 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7159 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7160 goto out_restart; 7161 } 7162 if (data->arg.new_lock_owner != 0) { 7163 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7164 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7165 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7166 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7167 goto out_restart; 7168 break; 7169 case -NFS4ERR_BAD_STATEID: 7170 case -NFS4ERR_OLD_STATEID: 7171 case -NFS4ERR_STALE_STATEID: 7172 case -NFS4ERR_EXPIRED: 7173 if (data->arg.new_lock_owner != 0) { 7174 if (!nfs4_stateid_match(&data->arg.open_stateid, 7175 &lsp->ls_state->open_stateid)) 7176 goto out_restart; 7177 else if (nfs4_async_handle_error(task, server, lsp->ls_state, NULL) == -EAGAIN) 7178 goto out_restart; 7179 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7180 &lsp->ls_stateid)) 7181 goto out_restart; 7182 } 7183 out_done: 7184 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7185 return; 7186 out_restart: 7187 if (!data->cancelled) 7188 rpc_restart_call_prepare(task); 7189 goto out_done; 7190 } 7191 7192 static void nfs4_lock_release(void *calldata) 7193 { 7194 struct nfs4_lockdata *data = calldata; 7195 7196 nfs_free_seqid(data->arg.open_seqid); 7197 if (data->cancelled && data->rpc_status == 0) { 7198 struct rpc_task *task; 7199 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7200 data->arg.lock_seqid); 7201 if (!IS_ERR(task)) 7202 rpc_put_task_async(task); 7203 dprintk("%s: cancelling lock!\n", __func__); 7204 } else 7205 nfs_free_seqid(data->arg.lock_seqid); 7206 nfs4_put_lock_state(data->lsp); 7207 put_nfs_open_context(data->ctx); 7208 kfree(data); 7209 } 7210 7211 static const struct rpc_call_ops nfs4_lock_ops = { 7212 .rpc_call_prepare = nfs4_lock_prepare, 7213 .rpc_call_done = nfs4_lock_done, 7214 .rpc_release = nfs4_lock_release, 7215 }; 7216 7217 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7218 { 7219 switch (error) { 7220 case -NFS4ERR_ADMIN_REVOKED: 7221 case -NFS4ERR_EXPIRED: 7222 case -NFS4ERR_BAD_STATEID: 7223 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7224 if (new_lock_owner != 0 || 7225 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7226 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7227 break; 7228 case -NFS4ERR_STALE_STATEID: 7229 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7230 nfs4_schedule_lease_recovery(server->nfs_client); 7231 } 7232 } 7233 7234 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7235 { 7236 struct nfs4_lockdata *data; 7237 struct rpc_task *task; 7238 struct rpc_message msg = { 7239 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7240 .rpc_cred = state->owner->so_cred, 7241 }; 7242 struct rpc_task_setup task_setup_data = { 7243 .rpc_client = NFS_CLIENT(state->inode), 7244 .rpc_message = &msg, 7245 .callback_ops = &nfs4_lock_ops, 7246 .workqueue = nfsiod_workqueue, 7247 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7248 }; 7249 int ret; 7250 7251 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7252 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7253 7254 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7255 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7256 if (data == NULL) 7257 return -ENOMEM; 7258 if (IS_SETLKW(cmd)) 7259 data->arg.block = 1; 7260 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7261 recovery_type > NFS_LOCK_NEW); 7262 msg.rpc_argp = &data->arg; 7263 msg.rpc_resp = &data->res; 7264 task_setup_data.callback_data = data; 7265 if (recovery_type > NFS_LOCK_NEW) { 7266 if (recovery_type == NFS_LOCK_RECLAIM) 7267 data->arg.reclaim = NFS_LOCK_RECLAIM; 7268 } else 7269 data->arg.new_lock = 1; 7270 task = rpc_run_task(&task_setup_data); 7271 if (IS_ERR(task)) 7272 return PTR_ERR(task); 7273 ret = rpc_wait_for_completion_task(task); 7274 if (ret == 0) { 7275 ret = data->rpc_status; 7276 if (ret) 7277 nfs4_handle_setlk_error(data->server, data->lsp, 7278 data->arg.new_lock_owner, ret); 7279 } else 7280 data->cancelled = true; 7281 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7282 rpc_put_task(task); 7283 dprintk("%s: ret = %d\n", __func__, ret); 7284 return ret; 7285 } 7286 7287 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7288 { 7289 struct nfs_server *server = NFS_SERVER(state->inode); 7290 struct nfs4_exception exception = { 7291 .inode = state->inode, 7292 }; 7293 int err; 7294 7295 do { 7296 /* Cache the lock if possible... */ 7297 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7298 return 0; 7299 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7300 if (err != -NFS4ERR_DELAY) 7301 break; 7302 nfs4_handle_exception(server, err, &exception); 7303 } while (exception.retry); 7304 return err; 7305 } 7306 7307 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7308 { 7309 struct nfs_server *server = NFS_SERVER(state->inode); 7310 struct nfs4_exception exception = { 7311 .inode = state->inode, 7312 }; 7313 int err; 7314 7315 err = nfs4_set_lock_state(state, request); 7316 if (err != 0) 7317 return err; 7318 if (!recover_lost_locks) { 7319 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7320 return 0; 7321 } 7322 do { 7323 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7324 return 0; 7325 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7326 switch (err) { 7327 default: 7328 goto out; 7329 case -NFS4ERR_GRACE: 7330 case -NFS4ERR_DELAY: 7331 nfs4_handle_exception(server, err, &exception); 7332 err = 0; 7333 } 7334 } while (exception.retry); 7335 out: 7336 return err; 7337 } 7338 7339 #if defined(CONFIG_NFS_V4_1) 7340 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7341 { 7342 struct nfs4_lock_state *lsp; 7343 int status; 7344 7345 status = nfs4_set_lock_state(state, request); 7346 if (status != 0) 7347 return status; 7348 lsp = request->fl_u.nfs4_fl.owner; 7349 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7350 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7351 return 0; 7352 return nfs4_lock_expired(state, request); 7353 } 7354 #endif 7355 7356 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7357 { 7358 struct nfs_inode *nfsi = NFS_I(state->inode); 7359 struct nfs4_state_owner *sp = state->owner; 7360 unsigned char fl_flags = request->fl_flags; 7361 int status; 7362 7363 request->fl_flags |= FL_ACCESS; 7364 status = locks_lock_inode_wait(state->inode, request); 7365 if (status < 0) 7366 goto out; 7367 mutex_lock(&sp->so_delegreturn_mutex); 7368 down_read(&nfsi->rwsem); 7369 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7370 /* Yes: cache locks! */ 7371 /* ...but avoid races with delegation recall... */ 7372 request->fl_flags = fl_flags & ~FL_SLEEP; 7373 status = locks_lock_inode_wait(state->inode, request); 7374 up_read(&nfsi->rwsem); 7375 mutex_unlock(&sp->so_delegreturn_mutex); 7376 goto out; 7377 } 7378 up_read(&nfsi->rwsem); 7379 mutex_unlock(&sp->so_delegreturn_mutex); 7380 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7381 out: 7382 request->fl_flags = fl_flags; 7383 return status; 7384 } 7385 7386 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7387 { 7388 struct nfs4_exception exception = { 7389 .state = state, 7390 .inode = state->inode, 7391 .interruptible = true, 7392 }; 7393 int err; 7394 7395 do { 7396 err = _nfs4_proc_setlk(state, cmd, request); 7397 if (err == -NFS4ERR_DENIED) 7398 err = -EAGAIN; 7399 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7400 err, &exception); 7401 } while (exception.retry); 7402 return err; 7403 } 7404 7405 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7406 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7407 7408 static int 7409 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7410 struct file_lock *request) 7411 { 7412 int status = -ERESTARTSYS; 7413 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7414 7415 while(!signalled()) { 7416 status = nfs4_proc_setlk(state, cmd, request); 7417 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7418 break; 7419 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7420 schedule_timeout(timeout); 7421 timeout *= 2; 7422 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7423 status = -ERESTARTSYS; 7424 } 7425 return status; 7426 } 7427 7428 #ifdef CONFIG_NFS_V4_1 7429 struct nfs4_lock_waiter { 7430 struct inode *inode; 7431 struct nfs_lowner owner; 7432 wait_queue_entry_t wait; 7433 }; 7434 7435 static int 7436 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7437 { 7438 struct nfs4_lock_waiter *waiter = 7439 container_of(wait, struct nfs4_lock_waiter, wait); 7440 7441 /* NULL key means to wake up everyone */ 7442 if (key) { 7443 struct cb_notify_lock_args *cbnl = key; 7444 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7445 *wowner = &waiter->owner; 7446 7447 /* Only wake if the callback was for the same owner. */ 7448 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7449 return 0; 7450 7451 /* Make sure it's for the right inode */ 7452 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7453 return 0; 7454 } 7455 7456 return woken_wake_function(wait, mode, flags, key); 7457 } 7458 7459 static int 7460 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7461 { 7462 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7463 struct nfs_server *server = NFS_SERVER(state->inode); 7464 struct nfs_client *clp = server->nfs_client; 7465 wait_queue_head_t *q = &clp->cl_lock_waitq; 7466 struct nfs4_lock_waiter waiter = { 7467 .inode = state->inode, 7468 .owner = { .clientid = clp->cl_clientid, 7469 .id = lsp->ls_seqid.owner_id, 7470 .s_dev = server->s_dev }, 7471 }; 7472 int status; 7473 7474 /* Don't bother with waitqueue if we don't expect a callback */ 7475 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7476 return nfs4_retry_setlk_simple(state, cmd, request); 7477 7478 init_wait(&waiter.wait); 7479 waiter.wait.func = nfs4_wake_lock_waiter; 7480 add_wait_queue(q, &waiter.wait); 7481 7482 do { 7483 status = nfs4_proc_setlk(state, cmd, request); 7484 if (status != -EAGAIN || IS_SETLK(cmd)) 7485 break; 7486 7487 status = -ERESTARTSYS; 7488 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7489 NFS4_LOCK_MAXTIMEOUT); 7490 } while (!signalled()); 7491 7492 remove_wait_queue(q, &waiter.wait); 7493 7494 return status; 7495 } 7496 #else /* !CONFIG_NFS_V4_1 */ 7497 static inline int 7498 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7499 { 7500 return nfs4_retry_setlk_simple(state, cmd, request); 7501 } 7502 #endif 7503 7504 static int 7505 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7506 { 7507 struct nfs_open_context *ctx; 7508 struct nfs4_state *state; 7509 int status; 7510 7511 /* verify open state */ 7512 ctx = nfs_file_open_context(filp); 7513 state = ctx->state; 7514 7515 if (IS_GETLK(cmd)) { 7516 if (state != NULL) 7517 return nfs4_proc_getlk(state, F_GETLK, request); 7518 return 0; 7519 } 7520 7521 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7522 return -EINVAL; 7523 7524 if (request->fl_type == F_UNLCK) { 7525 if (state != NULL) 7526 return nfs4_proc_unlck(state, cmd, request); 7527 return 0; 7528 } 7529 7530 if (state == NULL) 7531 return -ENOLCK; 7532 7533 if ((request->fl_flags & FL_POSIX) && 7534 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7535 return -ENOLCK; 7536 7537 /* 7538 * Don't rely on the VFS having checked the file open mode, 7539 * since it won't do this for flock() locks. 7540 */ 7541 switch (request->fl_type) { 7542 case F_RDLCK: 7543 if (!(filp->f_mode & FMODE_READ)) 7544 return -EBADF; 7545 break; 7546 case F_WRLCK: 7547 if (!(filp->f_mode & FMODE_WRITE)) 7548 return -EBADF; 7549 } 7550 7551 status = nfs4_set_lock_state(state, request); 7552 if (status != 0) 7553 return status; 7554 7555 return nfs4_retry_setlk(state, cmd, request); 7556 } 7557 7558 static int nfs4_delete_lease(struct file *file, void **priv) 7559 { 7560 return generic_setlease(file, F_UNLCK, NULL, priv); 7561 } 7562 7563 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease, 7564 void **priv) 7565 { 7566 struct inode *inode = file_inode(file); 7567 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7568 int ret; 7569 7570 /* No delegation, no lease */ 7571 if (!nfs4_have_delegation(inode, type)) 7572 return -EAGAIN; 7573 ret = generic_setlease(file, arg, lease, priv); 7574 if (ret || nfs4_have_delegation(inode, type)) 7575 return ret; 7576 /* We raced with a delegation return */ 7577 nfs4_delete_lease(file, priv); 7578 return -EAGAIN; 7579 } 7580 7581 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease, 7582 void **priv) 7583 { 7584 switch (arg) { 7585 case F_RDLCK: 7586 case F_WRLCK: 7587 return nfs4_add_lease(file, arg, lease, priv); 7588 case F_UNLCK: 7589 return nfs4_delete_lease(file, priv); 7590 default: 7591 return -EINVAL; 7592 } 7593 } 7594 7595 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7596 { 7597 struct nfs_server *server = NFS_SERVER(state->inode); 7598 int err; 7599 7600 err = nfs4_set_lock_state(state, fl); 7601 if (err != 0) 7602 return err; 7603 do { 7604 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7605 if (err != -NFS4ERR_DELAY) 7606 break; 7607 ssleep(1); 7608 } while (err == -NFS4ERR_DELAY); 7609 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7610 } 7611 7612 struct nfs_release_lockowner_data { 7613 struct nfs4_lock_state *lsp; 7614 struct nfs_server *server; 7615 struct nfs_release_lockowner_args args; 7616 struct nfs_release_lockowner_res res; 7617 unsigned long timestamp; 7618 }; 7619 7620 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7621 { 7622 struct nfs_release_lockowner_data *data = calldata; 7623 struct nfs_server *server = data->server; 7624 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7625 &data->res.seq_res, task); 7626 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7627 data->timestamp = jiffies; 7628 } 7629 7630 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7631 { 7632 struct nfs_release_lockowner_data *data = calldata; 7633 struct nfs_server *server = data->server; 7634 7635 nfs40_sequence_done(task, &data->res.seq_res); 7636 7637 switch (task->tk_status) { 7638 case 0: 7639 renew_lease(server, data->timestamp); 7640 break; 7641 case -NFS4ERR_STALE_CLIENTID: 7642 case -NFS4ERR_EXPIRED: 7643 nfs4_schedule_lease_recovery(server->nfs_client); 7644 break; 7645 case -NFS4ERR_LEASE_MOVED: 7646 case -NFS4ERR_DELAY: 7647 if (nfs4_async_handle_error(task, server, 7648 NULL, NULL) == -EAGAIN) 7649 rpc_restart_call_prepare(task); 7650 } 7651 } 7652 7653 static void nfs4_release_lockowner_release(void *calldata) 7654 { 7655 struct nfs_release_lockowner_data *data = calldata; 7656 nfs4_free_lock_state(data->server, data->lsp); 7657 kfree(calldata); 7658 } 7659 7660 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7661 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7662 .rpc_call_done = nfs4_release_lockowner_done, 7663 .rpc_release = nfs4_release_lockowner_release, 7664 }; 7665 7666 static void 7667 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7668 { 7669 struct nfs_release_lockowner_data *data; 7670 struct rpc_message msg = { 7671 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7672 }; 7673 7674 if (server->nfs_client->cl_mvops->minor_version != 0) 7675 return; 7676 7677 data = kmalloc(sizeof(*data), GFP_KERNEL); 7678 if (!data) 7679 return; 7680 data->lsp = lsp; 7681 data->server = server; 7682 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7683 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7684 data->args.lock_owner.s_dev = server->s_dev; 7685 7686 msg.rpc_argp = &data->args; 7687 msg.rpc_resp = &data->res; 7688 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7689 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7690 } 7691 7692 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7693 7694 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7695 struct mnt_idmap *idmap, 7696 struct dentry *unused, struct inode *inode, 7697 const char *key, const void *buf, 7698 size_t buflen, int flags) 7699 { 7700 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7701 } 7702 7703 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7704 struct dentry *unused, struct inode *inode, 7705 const char *key, void *buf, size_t buflen) 7706 { 7707 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7708 } 7709 7710 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7711 { 7712 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7713 } 7714 7715 #if defined(CONFIG_NFS_V4_1) 7716 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7717 7718 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7719 struct mnt_idmap *idmap, 7720 struct dentry *unused, struct inode *inode, 7721 const char *key, const void *buf, 7722 size_t buflen, int flags) 7723 { 7724 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7725 } 7726 7727 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7728 struct dentry *unused, struct inode *inode, 7729 const char *key, void *buf, size_t buflen) 7730 { 7731 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7732 } 7733 7734 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7735 { 7736 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7737 } 7738 7739 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7740 7741 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7742 struct mnt_idmap *idmap, 7743 struct dentry *unused, struct inode *inode, 7744 const char *key, const void *buf, 7745 size_t buflen, int flags) 7746 { 7747 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7748 } 7749 7750 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7751 struct dentry *unused, struct inode *inode, 7752 const char *key, void *buf, size_t buflen) 7753 { 7754 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7755 } 7756 7757 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7758 { 7759 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7760 } 7761 7762 #endif 7763 7764 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7765 7766 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7767 struct mnt_idmap *idmap, 7768 struct dentry *unused, struct inode *inode, 7769 const char *key, const void *buf, 7770 size_t buflen, int flags) 7771 { 7772 if (security_ismaclabel(key)) 7773 return nfs4_set_security_label(inode, buf, buflen); 7774 7775 return -EOPNOTSUPP; 7776 } 7777 7778 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7779 struct dentry *unused, struct inode *inode, 7780 const char *key, void *buf, size_t buflen) 7781 { 7782 if (security_ismaclabel(key)) 7783 return nfs4_get_security_label(inode, buf, buflen); 7784 return -EOPNOTSUPP; 7785 } 7786 7787 static ssize_t 7788 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7789 { 7790 int len = 0; 7791 7792 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7793 len = security_inode_listsecurity(inode, list, list_len); 7794 if (len >= 0 && list_len && len > list_len) 7795 return -ERANGE; 7796 } 7797 return len; 7798 } 7799 7800 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7801 .prefix = XATTR_SECURITY_PREFIX, 7802 .get = nfs4_xattr_get_nfs4_label, 7803 .set = nfs4_xattr_set_nfs4_label, 7804 }; 7805 7806 #else 7807 7808 static ssize_t 7809 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7810 { 7811 return 0; 7812 } 7813 7814 #endif 7815 7816 #ifdef CONFIG_NFS_V4_2 7817 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7818 struct mnt_idmap *idmap, 7819 struct dentry *unused, struct inode *inode, 7820 const char *key, const void *buf, 7821 size_t buflen, int flags) 7822 { 7823 u32 mask; 7824 int ret; 7825 7826 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7827 return -EOPNOTSUPP; 7828 7829 /* 7830 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7831 * flags right now. Handling of xattr operations use the normal 7832 * file read/write permissions. 7833 * 7834 * Just in case the server has other ideas (which RFC 8276 allows), 7835 * do a cached access check for the XA* flags to possibly avoid 7836 * doing an RPC and getting EACCES back. 7837 */ 7838 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7839 if (!(mask & NFS_ACCESS_XAWRITE)) 7840 return -EACCES; 7841 } 7842 7843 if (buf == NULL) { 7844 ret = nfs42_proc_removexattr(inode, key); 7845 if (!ret) 7846 nfs4_xattr_cache_remove(inode, key); 7847 } else { 7848 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7849 if (!ret) 7850 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7851 } 7852 7853 return ret; 7854 } 7855 7856 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7857 struct dentry *unused, struct inode *inode, 7858 const char *key, void *buf, size_t buflen) 7859 { 7860 u32 mask; 7861 ssize_t ret; 7862 7863 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7864 return -EOPNOTSUPP; 7865 7866 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7867 if (!(mask & NFS_ACCESS_XAREAD)) 7868 return -EACCES; 7869 } 7870 7871 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7872 if (ret) 7873 return ret; 7874 7875 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7876 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7877 return ret; 7878 7879 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7880 7881 return ret; 7882 } 7883 7884 static ssize_t 7885 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7886 { 7887 u64 cookie; 7888 bool eof; 7889 ssize_t ret, size; 7890 char *buf; 7891 size_t buflen; 7892 u32 mask; 7893 7894 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7895 return 0; 7896 7897 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7898 if (!(mask & NFS_ACCESS_XALIST)) 7899 return 0; 7900 } 7901 7902 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7903 if (ret) 7904 return ret; 7905 7906 ret = nfs4_xattr_cache_list(inode, list, list_len); 7907 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7908 return ret; 7909 7910 cookie = 0; 7911 eof = false; 7912 buflen = list_len ? list_len : XATTR_LIST_MAX; 7913 buf = list_len ? list : NULL; 7914 size = 0; 7915 7916 while (!eof) { 7917 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7918 &cookie, &eof); 7919 if (ret < 0) 7920 return ret; 7921 7922 if (list_len) { 7923 buf += ret; 7924 buflen -= ret; 7925 } 7926 size += ret; 7927 } 7928 7929 if (list_len) 7930 nfs4_xattr_cache_set_list(inode, list, size); 7931 7932 return size; 7933 } 7934 7935 #else 7936 7937 static ssize_t 7938 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7939 { 7940 return 0; 7941 } 7942 #endif /* CONFIG_NFS_V4_2 */ 7943 7944 /* 7945 * nfs_fhget will use either the mounted_on_fileid or the fileid 7946 */ 7947 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7948 { 7949 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7950 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7951 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7952 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7953 return; 7954 7955 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7956 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7957 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7958 fattr->nlink = 2; 7959 } 7960 7961 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7962 const struct qstr *name, 7963 struct nfs4_fs_locations *fs_locations, 7964 struct page *page) 7965 { 7966 struct nfs_server *server = NFS_SERVER(dir); 7967 u32 bitmask[3]; 7968 struct nfs4_fs_locations_arg args = { 7969 .dir_fh = NFS_FH(dir), 7970 .name = name, 7971 .page = page, 7972 .bitmask = bitmask, 7973 }; 7974 struct nfs4_fs_locations_res res = { 7975 .fs_locations = fs_locations, 7976 }; 7977 struct rpc_message msg = { 7978 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7979 .rpc_argp = &args, 7980 .rpc_resp = &res, 7981 }; 7982 int status; 7983 7984 dprintk("%s: start\n", __func__); 7985 7986 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7987 bitmask[1] = nfs4_fattr_bitmap[1]; 7988 7989 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7990 * is not supported */ 7991 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7992 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7993 else 7994 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7995 7996 nfs_fattr_init(fs_locations->fattr); 7997 fs_locations->server = server; 7998 fs_locations->nlocations = 0; 7999 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8000 dprintk("%s: returned status = %d\n", __func__, status); 8001 return status; 8002 } 8003 8004 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8005 const struct qstr *name, 8006 struct nfs4_fs_locations *fs_locations, 8007 struct page *page) 8008 { 8009 struct nfs4_exception exception = { 8010 .interruptible = true, 8011 }; 8012 int err; 8013 do { 8014 err = _nfs4_proc_fs_locations(client, dir, name, 8015 fs_locations, page); 8016 trace_nfs4_get_fs_locations(dir, name, err); 8017 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8018 &exception); 8019 } while (exception.retry); 8020 return err; 8021 } 8022 8023 /* 8024 * This operation also signals the server that this client is 8025 * performing migration recovery. The server can stop returning 8026 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8027 * appended to this compound to identify the client ID which is 8028 * performing recovery. 8029 */ 8030 static int _nfs40_proc_get_locations(struct nfs_server *server, 8031 struct nfs_fh *fhandle, 8032 struct nfs4_fs_locations *locations, 8033 struct page *page, const struct cred *cred) 8034 { 8035 struct rpc_clnt *clnt = server->client; 8036 u32 bitmask[2] = { 8037 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8038 }; 8039 struct nfs4_fs_locations_arg args = { 8040 .clientid = server->nfs_client->cl_clientid, 8041 .fh = fhandle, 8042 .page = page, 8043 .bitmask = bitmask, 8044 .migration = 1, /* skip LOOKUP */ 8045 .renew = 1, /* append RENEW */ 8046 }; 8047 struct nfs4_fs_locations_res res = { 8048 .fs_locations = locations, 8049 .migration = 1, 8050 .renew = 1, 8051 }; 8052 struct rpc_message msg = { 8053 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8054 .rpc_argp = &args, 8055 .rpc_resp = &res, 8056 .rpc_cred = cred, 8057 }; 8058 unsigned long now = jiffies; 8059 int status; 8060 8061 nfs_fattr_init(locations->fattr); 8062 locations->server = server; 8063 locations->nlocations = 0; 8064 8065 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8066 status = nfs4_call_sync_sequence(clnt, server, &msg, 8067 &args.seq_args, &res.seq_res); 8068 if (status) 8069 return status; 8070 8071 renew_lease(server, now); 8072 return 0; 8073 } 8074 8075 #ifdef CONFIG_NFS_V4_1 8076 8077 /* 8078 * This operation also signals the server that this client is 8079 * performing migration recovery. The server can stop asserting 8080 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8081 * performing this operation is identified in the SEQUENCE 8082 * operation in this compound. 8083 * 8084 * When the client supports GETATTR(fs_locations_info), it can 8085 * be plumbed in here. 8086 */ 8087 static int _nfs41_proc_get_locations(struct nfs_server *server, 8088 struct nfs_fh *fhandle, 8089 struct nfs4_fs_locations *locations, 8090 struct page *page, const struct cred *cred) 8091 { 8092 struct rpc_clnt *clnt = server->client; 8093 u32 bitmask[2] = { 8094 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8095 }; 8096 struct nfs4_fs_locations_arg args = { 8097 .fh = fhandle, 8098 .page = page, 8099 .bitmask = bitmask, 8100 .migration = 1, /* skip LOOKUP */ 8101 }; 8102 struct nfs4_fs_locations_res res = { 8103 .fs_locations = locations, 8104 .migration = 1, 8105 }; 8106 struct rpc_message msg = { 8107 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8108 .rpc_argp = &args, 8109 .rpc_resp = &res, 8110 .rpc_cred = cred, 8111 }; 8112 struct nfs4_call_sync_data data = { 8113 .seq_server = server, 8114 .seq_args = &args.seq_args, 8115 .seq_res = &res.seq_res, 8116 }; 8117 struct rpc_task_setup task_setup_data = { 8118 .rpc_client = clnt, 8119 .rpc_message = &msg, 8120 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8121 .callback_data = &data, 8122 .flags = RPC_TASK_NO_ROUND_ROBIN, 8123 }; 8124 int status; 8125 8126 nfs_fattr_init(locations->fattr); 8127 locations->server = server; 8128 locations->nlocations = 0; 8129 8130 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8131 status = nfs4_call_sync_custom(&task_setup_data); 8132 if (status == NFS4_OK && 8133 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8134 status = -NFS4ERR_LEASE_MOVED; 8135 return status; 8136 } 8137 8138 #endif /* CONFIG_NFS_V4_1 */ 8139 8140 /** 8141 * nfs4_proc_get_locations - discover locations for a migrated FSID 8142 * @server: pointer to nfs_server to process 8143 * @fhandle: pointer to the kernel NFS client file handle 8144 * @locations: result of query 8145 * @page: buffer 8146 * @cred: credential to use for this operation 8147 * 8148 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8149 * operation failed, or a negative errno if a local error occurred. 8150 * 8151 * On success, "locations" is filled in, but if the server has 8152 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8153 * asserted. 8154 * 8155 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8156 * from this client that require migration recovery. 8157 */ 8158 int nfs4_proc_get_locations(struct nfs_server *server, 8159 struct nfs_fh *fhandle, 8160 struct nfs4_fs_locations *locations, 8161 struct page *page, const struct cred *cred) 8162 { 8163 struct nfs_client *clp = server->nfs_client; 8164 const struct nfs4_mig_recovery_ops *ops = 8165 clp->cl_mvops->mig_recovery_ops; 8166 struct nfs4_exception exception = { 8167 .interruptible = true, 8168 }; 8169 int status; 8170 8171 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8172 (unsigned long long)server->fsid.major, 8173 (unsigned long long)server->fsid.minor, 8174 clp->cl_hostname); 8175 nfs_display_fhandle(fhandle, __func__); 8176 8177 do { 8178 status = ops->get_locations(server, fhandle, locations, page, 8179 cred); 8180 if (status != -NFS4ERR_DELAY) 8181 break; 8182 nfs4_handle_exception(server, status, &exception); 8183 } while (exception.retry); 8184 return status; 8185 } 8186 8187 /* 8188 * This operation also signals the server that this client is 8189 * performing "lease moved" recovery. The server can stop 8190 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8191 * is appended to this compound to identify the client ID which is 8192 * performing recovery. 8193 */ 8194 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8195 { 8196 struct nfs_server *server = NFS_SERVER(inode); 8197 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8198 struct rpc_clnt *clnt = server->client; 8199 struct nfs4_fsid_present_arg args = { 8200 .fh = NFS_FH(inode), 8201 .clientid = clp->cl_clientid, 8202 .renew = 1, /* append RENEW */ 8203 }; 8204 struct nfs4_fsid_present_res res = { 8205 .renew = 1, 8206 }; 8207 struct rpc_message msg = { 8208 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8209 .rpc_argp = &args, 8210 .rpc_resp = &res, 8211 .rpc_cred = cred, 8212 }; 8213 unsigned long now = jiffies; 8214 int status; 8215 8216 res.fh = nfs_alloc_fhandle(); 8217 if (res.fh == NULL) 8218 return -ENOMEM; 8219 8220 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8221 status = nfs4_call_sync_sequence(clnt, server, &msg, 8222 &args.seq_args, &res.seq_res); 8223 nfs_free_fhandle(res.fh); 8224 if (status) 8225 return status; 8226 8227 do_renew_lease(clp, now); 8228 return 0; 8229 } 8230 8231 #ifdef CONFIG_NFS_V4_1 8232 8233 /* 8234 * This operation also signals the server that this client is 8235 * performing "lease moved" recovery. The server can stop asserting 8236 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8237 * this operation is identified in the SEQUENCE operation in this 8238 * compound. 8239 */ 8240 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8241 { 8242 struct nfs_server *server = NFS_SERVER(inode); 8243 struct rpc_clnt *clnt = server->client; 8244 struct nfs4_fsid_present_arg args = { 8245 .fh = NFS_FH(inode), 8246 }; 8247 struct nfs4_fsid_present_res res = { 8248 }; 8249 struct rpc_message msg = { 8250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8251 .rpc_argp = &args, 8252 .rpc_resp = &res, 8253 .rpc_cred = cred, 8254 }; 8255 int status; 8256 8257 res.fh = nfs_alloc_fhandle(); 8258 if (res.fh == NULL) 8259 return -ENOMEM; 8260 8261 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8262 status = nfs4_call_sync_sequence(clnt, server, &msg, 8263 &args.seq_args, &res.seq_res); 8264 nfs_free_fhandle(res.fh); 8265 if (status == NFS4_OK && 8266 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8267 status = -NFS4ERR_LEASE_MOVED; 8268 return status; 8269 } 8270 8271 #endif /* CONFIG_NFS_V4_1 */ 8272 8273 /** 8274 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8275 * @inode: inode on FSID to check 8276 * @cred: credential to use for this operation 8277 * 8278 * Server indicates whether the FSID is present, moved, or not 8279 * recognized. This operation is necessary to clear a LEASE_MOVED 8280 * condition for this client ID. 8281 * 8282 * Returns NFS4_OK if the FSID is present on this server, 8283 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8284 * NFS4ERR code if some error occurred on the server, or a 8285 * negative errno if a local failure occurred. 8286 */ 8287 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8288 { 8289 struct nfs_server *server = NFS_SERVER(inode); 8290 struct nfs_client *clp = server->nfs_client; 8291 const struct nfs4_mig_recovery_ops *ops = 8292 clp->cl_mvops->mig_recovery_ops; 8293 struct nfs4_exception exception = { 8294 .interruptible = true, 8295 }; 8296 int status; 8297 8298 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8299 (unsigned long long)server->fsid.major, 8300 (unsigned long long)server->fsid.minor, 8301 clp->cl_hostname); 8302 nfs_display_fhandle(NFS_FH(inode), __func__); 8303 8304 do { 8305 status = ops->fsid_present(inode, cred); 8306 if (status != -NFS4ERR_DELAY) 8307 break; 8308 nfs4_handle_exception(server, status, &exception); 8309 } while (exception.retry); 8310 return status; 8311 } 8312 8313 /* 8314 * If 'use_integrity' is true and the state managment nfs_client 8315 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8316 * and the machine credential as per RFC3530bis and RFC5661 Security 8317 * Considerations sections. Otherwise, just use the user cred with the 8318 * filesystem's rpc_client. 8319 */ 8320 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8321 { 8322 int status; 8323 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8324 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8325 struct nfs4_secinfo_arg args = { 8326 .dir_fh = NFS_FH(dir), 8327 .name = name, 8328 }; 8329 struct nfs4_secinfo_res res = { 8330 .flavors = flavors, 8331 }; 8332 struct rpc_message msg = { 8333 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8334 .rpc_argp = &args, 8335 .rpc_resp = &res, 8336 }; 8337 struct nfs4_call_sync_data data = { 8338 .seq_server = NFS_SERVER(dir), 8339 .seq_args = &args.seq_args, 8340 .seq_res = &res.seq_res, 8341 }; 8342 struct rpc_task_setup task_setup = { 8343 .rpc_client = clnt, 8344 .rpc_message = &msg, 8345 .callback_ops = clp->cl_mvops->call_sync_ops, 8346 .callback_data = &data, 8347 .flags = RPC_TASK_NO_ROUND_ROBIN, 8348 }; 8349 const struct cred *cred = NULL; 8350 8351 if (use_integrity) { 8352 clnt = clp->cl_rpcclient; 8353 task_setup.rpc_client = clnt; 8354 8355 cred = nfs4_get_clid_cred(clp); 8356 msg.rpc_cred = cred; 8357 } 8358 8359 dprintk("NFS call secinfo %s\n", name->name); 8360 8361 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8362 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8363 status = nfs4_call_sync_custom(&task_setup); 8364 8365 dprintk("NFS reply secinfo: %d\n", status); 8366 8367 put_cred(cred); 8368 return status; 8369 } 8370 8371 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8372 struct nfs4_secinfo_flavors *flavors) 8373 { 8374 struct nfs4_exception exception = { 8375 .interruptible = true, 8376 }; 8377 int err; 8378 do { 8379 err = -NFS4ERR_WRONGSEC; 8380 8381 /* try to use integrity protection with machine cred */ 8382 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8383 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8384 8385 /* 8386 * if unable to use integrity protection, or SECINFO with 8387 * integrity protection returns NFS4ERR_WRONGSEC (which is 8388 * disallowed by spec, but exists in deployed servers) use 8389 * the current filesystem's rpc_client and the user cred. 8390 */ 8391 if (err == -NFS4ERR_WRONGSEC) 8392 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8393 8394 trace_nfs4_secinfo(dir, name, err); 8395 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8396 &exception); 8397 } while (exception.retry); 8398 return err; 8399 } 8400 8401 #ifdef CONFIG_NFS_V4_1 8402 /* 8403 * Check the exchange flags returned by the server for invalid flags, having 8404 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8405 * DS flags set. 8406 */ 8407 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8408 { 8409 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8410 goto out_inval; 8411 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8412 goto out_inval; 8413 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8414 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8415 goto out_inval; 8416 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8417 goto out_inval; 8418 return NFS_OK; 8419 out_inval: 8420 return -NFS4ERR_INVAL; 8421 } 8422 8423 static bool 8424 nfs41_same_server_scope(struct nfs41_server_scope *a, 8425 struct nfs41_server_scope *b) 8426 { 8427 if (a->server_scope_sz != b->server_scope_sz) 8428 return false; 8429 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8430 } 8431 8432 static void 8433 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8434 { 8435 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8436 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8437 struct nfs_client *clp = args->client; 8438 8439 switch (task->tk_status) { 8440 case -NFS4ERR_BADSESSION: 8441 case -NFS4ERR_DEADSESSION: 8442 nfs4_schedule_session_recovery(clp->cl_session, 8443 task->tk_status); 8444 return; 8445 } 8446 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8447 res->dir != NFS4_CDFS4_BOTH) { 8448 rpc_task_close_connection(task); 8449 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8450 rpc_restart_call(task); 8451 } 8452 } 8453 8454 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8455 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8456 }; 8457 8458 /* 8459 * nfs4_proc_bind_one_conn_to_session() 8460 * 8461 * The 4.1 client currently uses the same TCP connection for the 8462 * fore and backchannel. 8463 */ 8464 static 8465 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8466 struct rpc_xprt *xprt, 8467 struct nfs_client *clp, 8468 const struct cred *cred) 8469 { 8470 int status; 8471 struct nfs41_bind_conn_to_session_args args = { 8472 .client = clp, 8473 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8474 .retries = 0, 8475 }; 8476 struct nfs41_bind_conn_to_session_res res; 8477 struct rpc_message msg = { 8478 .rpc_proc = 8479 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8480 .rpc_argp = &args, 8481 .rpc_resp = &res, 8482 .rpc_cred = cred, 8483 }; 8484 struct rpc_task_setup task_setup_data = { 8485 .rpc_client = clnt, 8486 .rpc_xprt = xprt, 8487 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8488 .rpc_message = &msg, 8489 .flags = RPC_TASK_TIMEOUT, 8490 }; 8491 struct rpc_task *task; 8492 8493 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8494 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8495 args.dir = NFS4_CDFC4_FORE; 8496 8497 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8498 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8499 args.dir = NFS4_CDFC4_FORE; 8500 8501 task = rpc_run_task(&task_setup_data); 8502 if (!IS_ERR(task)) { 8503 status = task->tk_status; 8504 rpc_put_task(task); 8505 } else 8506 status = PTR_ERR(task); 8507 trace_nfs4_bind_conn_to_session(clp, status); 8508 if (status == 0) { 8509 if (memcmp(res.sessionid.data, 8510 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8511 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8512 return -EIO; 8513 } 8514 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8515 dprintk("NFS: %s: Unexpected direction from server\n", 8516 __func__); 8517 return -EIO; 8518 } 8519 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8520 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8521 __func__); 8522 return -EIO; 8523 } 8524 } 8525 8526 return status; 8527 } 8528 8529 struct rpc_bind_conn_calldata { 8530 struct nfs_client *clp; 8531 const struct cred *cred; 8532 }; 8533 8534 static int 8535 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8536 struct rpc_xprt *xprt, 8537 void *calldata) 8538 { 8539 struct rpc_bind_conn_calldata *p = calldata; 8540 8541 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8542 } 8543 8544 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8545 { 8546 struct rpc_bind_conn_calldata data = { 8547 .clp = clp, 8548 .cred = cred, 8549 }; 8550 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8551 nfs4_proc_bind_conn_to_session_callback, &data); 8552 } 8553 8554 /* 8555 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8556 * and operations we'd like to see to enable certain features in the allow map 8557 */ 8558 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8559 .how = SP4_MACH_CRED, 8560 .enforce.u.words = { 8561 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8562 1 << (OP_EXCHANGE_ID - 32) | 8563 1 << (OP_CREATE_SESSION - 32) | 8564 1 << (OP_DESTROY_SESSION - 32) | 8565 1 << (OP_DESTROY_CLIENTID - 32) 8566 }, 8567 .allow.u.words = { 8568 [0] = 1 << (OP_CLOSE) | 8569 1 << (OP_OPEN_DOWNGRADE) | 8570 1 << (OP_LOCKU) | 8571 1 << (OP_DELEGRETURN) | 8572 1 << (OP_COMMIT), 8573 [1] = 1 << (OP_SECINFO - 32) | 8574 1 << (OP_SECINFO_NO_NAME - 32) | 8575 1 << (OP_LAYOUTRETURN - 32) | 8576 1 << (OP_TEST_STATEID - 32) | 8577 1 << (OP_FREE_STATEID - 32) | 8578 1 << (OP_WRITE - 32) 8579 } 8580 }; 8581 8582 /* 8583 * Select the state protection mode for client `clp' given the server results 8584 * from exchange_id in `sp'. 8585 * 8586 * Returns 0 on success, negative errno otherwise. 8587 */ 8588 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8589 struct nfs41_state_protection *sp) 8590 { 8591 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8592 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8593 1 << (OP_EXCHANGE_ID - 32) | 8594 1 << (OP_CREATE_SESSION - 32) | 8595 1 << (OP_DESTROY_SESSION - 32) | 8596 1 << (OP_DESTROY_CLIENTID - 32) 8597 }; 8598 unsigned long flags = 0; 8599 unsigned int i; 8600 int ret = 0; 8601 8602 if (sp->how == SP4_MACH_CRED) { 8603 /* Print state protect result */ 8604 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8605 for (i = 0; i <= LAST_NFS4_OP; i++) { 8606 if (test_bit(i, sp->enforce.u.longs)) 8607 dfprintk(MOUNT, " enforce op %d\n", i); 8608 if (test_bit(i, sp->allow.u.longs)) 8609 dfprintk(MOUNT, " allow op %d\n", i); 8610 } 8611 8612 /* make sure nothing is on enforce list that isn't supported */ 8613 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8614 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8615 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8616 ret = -EINVAL; 8617 goto out; 8618 } 8619 } 8620 8621 /* 8622 * Minimal mode - state operations are allowed to use machine 8623 * credential. Note this already happens by default, so the 8624 * client doesn't have to do anything more than the negotiation. 8625 * 8626 * NOTE: we don't care if EXCHANGE_ID is in the list - 8627 * we're already using the machine cred for exchange_id 8628 * and will never use a different cred. 8629 */ 8630 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8631 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8632 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8633 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8634 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8635 dfprintk(MOUNT, " minimal mode enabled\n"); 8636 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8637 } else { 8638 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8639 ret = -EINVAL; 8640 goto out; 8641 } 8642 8643 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8644 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8645 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8646 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8647 dfprintk(MOUNT, " cleanup mode enabled\n"); 8648 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8649 } 8650 8651 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8652 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8653 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8654 } 8655 8656 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8657 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8658 dfprintk(MOUNT, " secinfo mode enabled\n"); 8659 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8660 } 8661 8662 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8663 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8664 dfprintk(MOUNT, " stateid mode enabled\n"); 8665 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8666 } 8667 8668 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8669 dfprintk(MOUNT, " write mode enabled\n"); 8670 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8671 } 8672 8673 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8674 dfprintk(MOUNT, " commit mode enabled\n"); 8675 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8676 } 8677 } 8678 out: 8679 clp->cl_sp4_flags = flags; 8680 return ret; 8681 } 8682 8683 struct nfs41_exchange_id_data { 8684 struct nfs41_exchange_id_res res; 8685 struct nfs41_exchange_id_args args; 8686 }; 8687 8688 static void nfs4_exchange_id_release(void *data) 8689 { 8690 struct nfs41_exchange_id_data *cdata = 8691 (struct nfs41_exchange_id_data *)data; 8692 8693 nfs_put_client(cdata->args.client); 8694 kfree(cdata->res.impl_id); 8695 kfree(cdata->res.server_scope); 8696 kfree(cdata->res.server_owner); 8697 kfree(cdata); 8698 } 8699 8700 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8701 .rpc_release = nfs4_exchange_id_release, 8702 }; 8703 8704 /* 8705 * _nfs4_proc_exchange_id() 8706 * 8707 * Wrapper for EXCHANGE_ID operation. 8708 */ 8709 static struct rpc_task * 8710 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8711 u32 sp4_how, struct rpc_xprt *xprt) 8712 { 8713 struct rpc_message msg = { 8714 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8715 .rpc_cred = cred, 8716 }; 8717 struct rpc_task_setup task_setup_data = { 8718 .rpc_client = clp->cl_rpcclient, 8719 .callback_ops = &nfs4_exchange_id_call_ops, 8720 .rpc_message = &msg, 8721 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8722 }; 8723 struct nfs41_exchange_id_data *calldata; 8724 int status; 8725 8726 if (!refcount_inc_not_zero(&clp->cl_count)) 8727 return ERR_PTR(-EIO); 8728 8729 status = -ENOMEM; 8730 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8731 if (!calldata) 8732 goto out; 8733 8734 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8735 8736 status = nfs4_init_uniform_client_string(clp); 8737 if (status) 8738 goto out_calldata; 8739 8740 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8741 GFP_NOFS); 8742 status = -ENOMEM; 8743 if (unlikely(calldata->res.server_owner == NULL)) 8744 goto out_calldata; 8745 8746 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8747 GFP_NOFS); 8748 if (unlikely(calldata->res.server_scope == NULL)) 8749 goto out_server_owner; 8750 8751 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8752 if (unlikely(calldata->res.impl_id == NULL)) 8753 goto out_server_scope; 8754 8755 switch (sp4_how) { 8756 case SP4_NONE: 8757 calldata->args.state_protect.how = SP4_NONE; 8758 break; 8759 8760 case SP4_MACH_CRED: 8761 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8762 break; 8763 8764 default: 8765 /* unsupported! */ 8766 WARN_ON_ONCE(1); 8767 status = -EINVAL; 8768 goto out_impl_id; 8769 } 8770 if (xprt) { 8771 task_setup_data.rpc_xprt = xprt; 8772 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8773 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8774 sizeof(calldata->args.verifier.data)); 8775 } 8776 calldata->args.client = clp; 8777 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8778 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8779 #ifdef CONFIG_NFS_V4_1_MIGRATION 8780 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8781 #endif 8782 msg.rpc_argp = &calldata->args; 8783 msg.rpc_resp = &calldata->res; 8784 task_setup_data.callback_data = calldata; 8785 8786 return rpc_run_task(&task_setup_data); 8787 8788 out_impl_id: 8789 kfree(calldata->res.impl_id); 8790 out_server_scope: 8791 kfree(calldata->res.server_scope); 8792 out_server_owner: 8793 kfree(calldata->res.server_owner); 8794 out_calldata: 8795 kfree(calldata); 8796 out: 8797 nfs_put_client(clp); 8798 return ERR_PTR(status); 8799 } 8800 8801 /* 8802 * _nfs4_proc_exchange_id() 8803 * 8804 * Wrapper for EXCHANGE_ID operation. 8805 */ 8806 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8807 u32 sp4_how) 8808 { 8809 struct rpc_task *task; 8810 struct nfs41_exchange_id_args *argp; 8811 struct nfs41_exchange_id_res *resp; 8812 unsigned long now = jiffies; 8813 int status; 8814 8815 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8816 if (IS_ERR(task)) 8817 return PTR_ERR(task); 8818 8819 argp = task->tk_msg.rpc_argp; 8820 resp = task->tk_msg.rpc_resp; 8821 status = task->tk_status; 8822 if (status != 0) 8823 goto out; 8824 8825 status = nfs4_check_cl_exchange_flags(resp->flags, 8826 clp->cl_mvops->minor_version); 8827 if (status != 0) 8828 goto out; 8829 8830 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8831 if (status != 0) 8832 goto out; 8833 8834 do_renew_lease(clp, now); 8835 8836 clp->cl_clientid = resp->clientid; 8837 clp->cl_exchange_flags = resp->flags; 8838 clp->cl_seqid = resp->seqid; 8839 /* Client ID is not confirmed */ 8840 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8841 clear_bit(NFS4_SESSION_ESTABLISHED, 8842 &clp->cl_session->session_state); 8843 8844 if (clp->cl_serverscope != NULL && 8845 !nfs41_same_server_scope(clp->cl_serverscope, 8846 resp->server_scope)) { 8847 dprintk("%s: server_scope mismatch detected\n", 8848 __func__); 8849 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8850 } 8851 8852 swap(clp->cl_serverowner, resp->server_owner); 8853 swap(clp->cl_serverscope, resp->server_scope); 8854 swap(clp->cl_implid, resp->impl_id); 8855 8856 /* Save the EXCHANGE_ID verifier session trunk tests */ 8857 memcpy(clp->cl_confirm.data, argp->verifier.data, 8858 sizeof(clp->cl_confirm.data)); 8859 out: 8860 trace_nfs4_exchange_id(clp, status); 8861 rpc_put_task(task); 8862 return status; 8863 } 8864 8865 /* 8866 * nfs4_proc_exchange_id() 8867 * 8868 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8869 * 8870 * Since the clientid has expired, all compounds using sessions 8871 * associated with the stale clientid will be returning 8872 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8873 * be in some phase of session reset. 8874 * 8875 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8876 */ 8877 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8878 { 8879 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8880 int status; 8881 8882 /* try SP4_MACH_CRED if krb5i/p */ 8883 if (authflavor == RPC_AUTH_GSS_KRB5I || 8884 authflavor == RPC_AUTH_GSS_KRB5P) { 8885 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8886 if (!status) 8887 return 0; 8888 } 8889 8890 /* try SP4_NONE */ 8891 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8892 } 8893 8894 /** 8895 * nfs4_test_session_trunk 8896 * 8897 * This is an add_xprt_test() test function called from 8898 * rpc_clnt_setup_test_and_add_xprt. 8899 * 8900 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8901 * and is dereferrenced in nfs4_exchange_id_release 8902 * 8903 * Upon success, add the new transport to the rpc_clnt 8904 * 8905 * @clnt: struct rpc_clnt to get new transport 8906 * @xprt: the rpc_xprt to test 8907 * @data: call data for _nfs4_proc_exchange_id. 8908 */ 8909 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8910 void *data) 8911 { 8912 struct nfs4_add_xprt_data *adata = data; 8913 struct rpc_task *task; 8914 int status; 8915 8916 u32 sp4_how; 8917 8918 dprintk("--> %s try %s\n", __func__, 8919 xprt->address_strings[RPC_DISPLAY_ADDR]); 8920 8921 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8922 8923 /* Test connection for session trunking. Async exchange_id call */ 8924 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8925 if (IS_ERR(task)) 8926 return; 8927 8928 status = task->tk_status; 8929 if (status == 0) 8930 status = nfs4_detect_session_trunking(adata->clp, 8931 task->tk_msg.rpc_resp, xprt); 8932 8933 if (status == 0) 8934 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8935 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8936 (struct sockaddr *)&xprt->addr)) 8937 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8938 8939 rpc_put_task(task); 8940 } 8941 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8942 8943 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8944 const struct cred *cred) 8945 { 8946 struct rpc_message msg = { 8947 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8948 .rpc_argp = clp, 8949 .rpc_cred = cred, 8950 }; 8951 int status; 8952 8953 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8954 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8955 trace_nfs4_destroy_clientid(clp, status); 8956 if (status) 8957 dprintk("NFS: Got error %d from the server %s on " 8958 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8959 return status; 8960 } 8961 8962 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8963 const struct cred *cred) 8964 { 8965 unsigned int loop; 8966 int ret; 8967 8968 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8969 ret = _nfs4_proc_destroy_clientid(clp, cred); 8970 switch (ret) { 8971 case -NFS4ERR_DELAY: 8972 case -NFS4ERR_CLIENTID_BUSY: 8973 ssleep(1); 8974 break; 8975 default: 8976 return ret; 8977 } 8978 } 8979 return 0; 8980 } 8981 8982 int nfs4_destroy_clientid(struct nfs_client *clp) 8983 { 8984 const struct cred *cred; 8985 int ret = 0; 8986 8987 if (clp->cl_mvops->minor_version < 1) 8988 goto out; 8989 if (clp->cl_exchange_flags == 0) 8990 goto out; 8991 if (clp->cl_preserve_clid) 8992 goto out; 8993 cred = nfs4_get_clid_cred(clp); 8994 ret = nfs4_proc_destroy_clientid(clp, cred); 8995 put_cred(cred); 8996 switch (ret) { 8997 case 0: 8998 case -NFS4ERR_STALE_CLIENTID: 8999 clp->cl_exchange_flags = 0; 9000 } 9001 out: 9002 return ret; 9003 } 9004 9005 #endif /* CONFIG_NFS_V4_1 */ 9006 9007 struct nfs4_get_lease_time_data { 9008 struct nfs4_get_lease_time_args *args; 9009 struct nfs4_get_lease_time_res *res; 9010 struct nfs_client *clp; 9011 }; 9012 9013 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9014 void *calldata) 9015 { 9016 struct nfs4_get_lease_time_data *data = 9017 (struct nfs4_get_lease_time_data *)calldata; 9018 9019 /* just setup sequence, do not trigger session recovery 9020 since we're invoked within one */ 9021 nfs4_setup_sequence(data->clp, 9022 &data->args->la_seq_args, 9023 &data->res->lr_seq_res, 9024 task); 9025 } 9026 9027 /* 9028 * Called from nfs4_state_manager thread for session setup, so don't recover 9029 * from sequence operation or clientid errors. 9030 */ 9031 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9032 { 9033 struct nfs4_get_lease_time_data *data = 9034 (struct nfs4_get_lease_time_data *)calldata; 9035 9036 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9037 return; 9038 switch (task->tk_status) { 9039 case -NFS4ERR_DELAY: 9040 case -NFS4ERR_GRACE: 9041 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9042 task->tk_status = 0; 9043 fallthrough; 9044 case -NFS4ERR_RETRY_UNCACHED_REP: 9045 rpc_restart_call_prepare(task); 9046 return; 9047 } 9048 } 9049 9050 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9051 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9052 .rpc_call_done = nfs4_get_lease_time_done, 9053 }; 9054 9055 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9056 { 9057 struct nfs4_get_lease_time_args args; 9058 struct nfs4_get_lease_time_res res = { 9059 .lr_fsinfo = fsinfo, 9060 }; 9061 struct nfs4_get_lease_time_data data = { 9062 .args = &args, 9063 .res = &res, 9064 .clp = clp, 9065 }; 9066 struct rpc_message msg = { 9067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9068 .rpc_argp = &args, 9069 .rpc_resp = &res, 9070 }; 9071 struct rpc_task_setup task_setup = { 9072 .rpc_client = clp->cl_rpcclient, 9073 .rpc_message = &msg, 9074 .callback_ops = &nfs4_get_lease_time_ops, 9075 .callback_data = &data, 9076 .flags = RPC_TASK_TIMEOUT, 9077 }; 9078 9079 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9080 return nfs4_call_sync_custom(&task_setup); 9081 } 9082 9083 #ifdef CONFIG_NFS_V4_1 9084 9085 /* 9086 * Initialize the values to be used by the client in CREATE_SESSION 9087 * If nfs4_init_session set the fore channel request and response sizes, 9088 * use them. 9089 * 9090 * Set the back channel max_resp_sz_cached to zero to force the client to 9091 * always set csa_cachethis to FALSE because the current implementation 9092 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9093 */ 9094 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9095 struct rpc_clnt *clnt) 9096 { 9097 unsigned int max_rqst_sz, max_resp_sz; 9098 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9099 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9100 9101 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9102 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9103 9104 /* Fore channel attributes */ 9105 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9106 args->fc_attrs.max_resp_sz = max_resp_sz; 9107 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9108 args->fc_attrs.max_reqs = max_session_slots; 9109 9110 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9111 "max_ops=%u max_reqs=%u\n", 9112 __func__, 9113 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9114 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9115 9116 /* Back channel attributes */ 9117 args->bc_attrs.max_rqst_sz = max_bc_payload; 9118 args->bc_attrs.max_resp_sz = max_bc_payload; 9119 args->bc_attrs.max_resp_sz_cached = 0; 9120 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9121 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9122 if (args->bc_attrs.max_reqs > max_bc_slots) 9123 args->bc_attrs.max_reqs = max_bc_slots; 9124 9125 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9126 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9127 __func__, 9128 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9129 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9130 args->bc_attrs.max_reqs); 9131 } 9132 9133 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9134 struct nfs41_create_session_res *res) 9135 { 9136 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9137 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9138 9139 if (rcvd->max_resp_sz > sent->max_resp_sz) 9140 return -EINVAL; 9141 /* 9142 * Our requested max_ops is the minimum we need; we're not 9143 * prepared to break up compounds into smaller pieces than that. 9144 * So, no point even trying to continue if the server won't 9145 * cooperate: 9146 */ 9147 if (rcvd->max_ops < sent->max_ops) 9148 return -EINVAL; 9149 if (rcvd->max_reqs == 0) 9150 return -EINVAL; 9151 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9152 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9153 return 0; 9154 } 9155 9156 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9157 struct nfs41_create_session_res *res) 9158 { 9159 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9160 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9161 9162 if (!(res->flags & SESSION4_BACK_CHAN)) 9163 goto out; 9164 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9165 return -EINVAL; 9166 if (rcvd->max_resp_sz < sent->max_resp_sz) 9167 return -EINVAL; 9168 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9169 return -EINVAL; 9170 if (rcvd->max_ops > sent->max_ops) 9171 return -EINVAL; 9172 if (rcvd->max_reqs > sent->max_reqs) 9173 return -EINVAL; 9174 out: 9175 return 0; 9176 } 9177 9178 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9179 struct nfs41_create_session_res *res) 9180 { 9181 int ret; 9182 9183 ret = nfs4_verify_fore_channel_attrs(args, res); 9184 if (ret) 9185 return ret; 9186 return nfs4_verify_back_channel_attrs(args, res); 9187 } 9188 9189 static void nfs4_update_session(struct nfs4_session *session, 9190 struct nfs41_create_session_res *res) 9191 { 9192 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9193 /* Mark client id and session as being confirmed */ 9194 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9195 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9196 session->flags = res->flags; 9197 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9198 if (res->flags & SESSION4_BACK_CHAN) 9199 memcpy(&session->bc_attrs, &res->bc_attrs, 9200 sizeof(session->bc_attrs)); 9201 } 9202 9203 static int _nfs4_proc_create_session(struct nfs_client *clp, 9204 const struct cred *cred) 9205 { 9206 struct nfs4_session *session = clp->cl_session; 9207 struct nfs41_create_session_args args = { 9208 .client = clp, 9209 .clientid = clp->cl_clientid, 9210 .seqid = clp->cl_seqid, 9211 .cb_program = NFS4_CALLBACK, 9212 }; 9213 struct nfs41_create_session_res res; 9214 9215 struct rpc_message msg = { 9216 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9217 .rpc_argp = &args, 9218 .rpc_resp = &res, 9219 .rpc_cred = cred, 9220 }; 9221 int status; 9222 9223 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9224 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9225 9226 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9227 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9228 trace_nfs4_create_session(clp, status); 9229 9230 switch (status) { 9231 case -NFS4ERR_STALE_CLIENTID: 9232 case -NFS4ERR_DELAY: 9233 case -ETIMEDOUT: 9234 case -EACCES: 9235 case -EAGAIN: 9236 goto out; 9237 } 9238 9239 clp->cl_seqid++; 9240 if (!status) { 9241 /* Verify the session's negotiated channel_attrs values */ 9242 status = nfs4_verify_channel_attrs(&args, &res); 9243 /* Increment the clientid slot sequence id */ 9244 if (status) 9245 goto out; 9246 nfs4_update_session(session, &res); 9247 } 9248 out: 9249 return status; 9250 } 9251 9252 /* 9253 * Issues a CREATE_SESSION operation to the server. 9254 * It is the responsibility of the caller to verify the session is 9255 * expired before calling this routine. 9256 */ 9257 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9258 { 9259 int status; 9260 unsigned *ptr; 9261 struct nfs4_session *session = clp->cl_session; 9262 struct nfs4_add_xprt_data xprtdata = { 9263 .clp = clp, 9264 }; 9265 struct rpc_add_xprt_test rpcdata = { 9266 .add_xprt_test = clp->cl_mvops->session_trunk, 9267 .data = &xprtdata, 9268 }; 9269 9270 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9271 9272 status = _nfs4_proc_create_session(clp, cred); 9273 if (status) 9274 goto out; 9275 9276 /* Init or reset the session slot tables */ 9277 status = nfs4_setup_session_slot_tables(session); 9278 dprintk("slot table setup returned %d\n", status); 9279 if (status) 9280 goto out; 9281 9282 ptr = (unsigned *)&session->sess_id.data[0]; 9283 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9284 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9285 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9286 out: 9287 return status; 9288 } 9289 9290 /* 9291 * Issue the over-the-wire RPC DESTROY_SESSION. 9292 * The caller must serialize access to this routine. 9293 */ 9294 int nfs4_proc_destroy_session(struct nfs4_session *session, 9295 const struct cred *cred) 9296 { 9297 struct rpc_message msg = { 9298 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9299 .rpc_argp = session, 9300 .rpc_cred = cred, 9301 }; 9302 int status = 0; 9303 9304 /* session is still being setup */ 9305 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9306 return 0; 9307 9308 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9309 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9310 trace_nfs4_destroy_session(session->clp, status); 9311 9312 if (status) 9313 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9314 "Session has been destroyed regardless...\n", status); 9315 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9316 return status; 9317 } 9318 9319 /* 9320 * Renew the cl_session lease. 9321 */ 9322 struct nfs4_sequence_data { 9323 struct nfs_client *clp; 9324 struct nfs4_sequence_args args; 9325 struct nfs4_sequence_res res; 9326 }; 9327 9328 static void nfs41_sequence_release(void *data) 9329 { 9330 struct nfs4_sequence_data *calldata = data; 9331 struct nfs_client *clp = calldata->clp; 9332 9333 if (refcount_read(&clp->cl_count) > 1) 9334 nfs4_schedule_state_renewal(clp); 9335 nfs_put_client(clp); 9336 kfree(calldata); 9337 } 9338 9339 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9340 { 9341 switch(task->tk_status) { 9342 case -NFS4ERR_DELAY: 9343 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9344 return -EAGAIN; 9345 default: 9346 nfs4_schedule_lease_recovery(clp); 9347 } 9348 return 0; 9349 } 9350 9351 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9352 { 9353 struct nfs4_sequence_data *calldata = data; 9354 struct nfs_client *clp = calldata->clp; 9355 9356 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9357 return; 9358 9359 trace_nfs4_sequence(clp, task->tk_status); 9360 if (task->tk_status < 0) { 9361 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9362 if (refcount_read(&clp->cl_count) == 1) 9363 return; 9364 9365 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9366 rpc_restart_call_prepare(task); 9367 return; 9368 } 9369 } 9370 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9371 } 9372 9373 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9374 { 9375 struct nfs4_sequence_data *calldata = data; 9376 struct nfs_client *clp = calldata->clp; 9377 struct nfs4_sequence_args *args; 9378 struct nfs4_sequence_res *res; 9379 9380 args = task->tk_msg.rpc_argp; 9381 res = task->tk_msg.rpc_resp; 9382 9383 nfs4_setup_sequence(clp, args, res, task); 9384 } 9385 9386 static const struct rpc_call_ops nfs41_sequence_ops = { 9387 .rpc_call_done = nfs41_sequence_call_done, 9388 .rpc_call_prepare = nfs41_sequence_prepare, 9389 .rpc_release = nfs41_sequence_release, 9390 }; 9391 9392 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9393 const struct cred *cred, 9394 struct nfs4_slot *slot, 9395 bool is_privileged) 9396 { 9397 struct nfs4_sequence_data *calldata; 9398 struct rpc_message msg = { 9399 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9400 .rpc_cred = cred, 9401 }; 9402 struct rpc_task_setup task_setup_data = { 9403 .rpc_client = clp->cl_rpcclient, 9404 .rpc_message = &msg, 9405 .callback_ops = &nfs41_sequence_ops, 9406 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9407 }; 9408 struct rpc_task *ret; 9409 9410 ret = ERR_PTR(-EIO); 9411 if (!refcount_inc_not_zero(&clp->cl_count)) 9412 goto out_err; 9413 9414 ret = ERR_PTR(-ENOMEM); 9415 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9416 if (calldata == NULL) 9417 goto out_put_clp; 9418 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9419 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9420 msg.rpc_argp = &calldata->args; 9421 msg.rpc_resp = &calldata->res; 9422 calldata->clp = clp; 9423 task_setup_data.callback_data = calldata; 9424 9425 ret = rpc_run_task(&task_setup_data); 9426 if (IS_ERR(ret)) 9427 goto out_err; 9428 return ret; 9429 out_put_clp: 9430 nfs_put_client(clp); 9431 out_err: 9432 nfs41_release_slot(slot); 9433 return ret; 9434 } 9435 9436 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9437 { 9438 struct rpc_task *task; 9439 int ret = 0; 9440 9441 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9442 return -EAGAIN; 9443 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9444 if (IS_ERR(task)) 9445 ret = PTR_ERR(task); 9446 else 9447 rpc_put_task_async(task); 9448 dprintk("<-- %s status=%d\n", __func__, ret); 9449 return ret; 9450 } 9451 9452 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9453 { 9454 struct rpc_task *task; 9455 int ret; 9456 9457 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9458 if (IS_ERR(task)) { 9459 ret = PTR_ERR(task); 9460 goto out; 9461 } 9462 ret = rpc_wait_for_completion_task(task); 9463 if (!ret) 9464 ret = task->tk_status; 9465 rpc_put_task(task); 9466 out: 9467 dprintk("<-- %s status=%d\n", __func__, ret); 9468 return ret; 9469 } 9470 9471 struct nfs4_reclaim_complete_data { 9472 struct nfs_client *clp; 9473 struct nfs41_reclaim_complete_args arg; 9474 struct nfs41_reclaim_complete_res res; 9475 }; 9476 9477 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9478 { 9479 struct nfs4_reclaim_complete_data *calldata = data; 9480 9481 nfs4_setup_sequence(calldata->clp, 9482 &calldata->arg.seq_args, 9483 &calldata->res.seq_res, 9484 task); 9485 } 9486 9487 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9488 { 9489 switch(task->tk_status) { 9490 case 0: 9491 wake_up_all(&clp->cl_lock_waitq); 9492 fallthrough; 9493 case -NFS4ERR_COMPLETE_ALREADY: 9494 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9495 break; 9496 case -NFS4ERR_DELAY: 9497 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9498 fallthrough; 9499 case -NFS4ERR_RETRY_UNCACHED_REP: 9500 case -EACCES: 9501 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9502 __func__, task->tk_status, clp->cl_hostname); 9503 return -EAGAIN; 9504 case -NFS4ERR_BADSESSION: 9505 case -NFS4ERR_DEADSESSION: 9506 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9507 break; 9508 default: 9509 nfs4_schedule_lease_recovery(clp); 9510 } 9511 return 0; 9512 } 9513 9514 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9515 { 9516 struct nfs4_reclaim_complete_data *calldata = data; 9517 struct nfs_client *clp = calldata->clp; 9518 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9519 9520 if (!nfs41_sequence_done(task, res)) 9521 return; 9522 9523 trace_nfs4_reclaim_complete(clp, task->tk_status); 9524 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9525 rpc_restart_call_prepare(task); 9526 return; 9527 } 9528 } 9529 9530 static void nfs4_free_reclaim_complete_data(void *data) 9531 { 9532 struct nfs4_reclaim_complete_data *calldata = data; 9533 9534 kfree(calldata); 9535 } 9536 9537 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9538 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9539 .rpc_call_done = nfs4_reclaim_complete_done, 9540 .rpc_release = nfs4_free_reclaim_complete_data, 9541 }; 9542 9543 /* 9544 * Issue a global reclaim complete. 9545 */ 9546 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9547 const struct cred *cred) 9548 { 9549 struct nfs4_reclaim_complete_data *calldata; 9550 struct rpc_message msg = { 9551 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9552 .rpc_cred = cred, 9553 }; 9554 struct rpc_task_setup task_setup_data = { 9555 .rpc_client = clp->cl_rpcclient, 9556 .rpc_message = &msg, 9557 .callback_ops = &nfs4_reclaim_complete_call_ops, 9558 .flags = RPC_TASK_NO_ROUND_ROBIN, 9559 }; 9560 int status = -ENOMEM; 9561 9562 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9563 if (calldata == NULL) 9564 goto out; 9565 calldata->clp = clp; 9566 calldata->arg.one_fs = 0; 9567 9568 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9569 msg.rpc_argp = &calldata->arg; 9570 msg.rpc_resp = &calldata->res; 9571 task_setup_data.callback_data = calldata; 9572 status = nfs4_call_sync_custom(&task_setup_data); 9573 out: 9574 dprintk("<-- %s status=%d\n", __func__, status); 9575 return status; 9576 } 9577 9578 static void 9579 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9580 { 9581 struct nfs4_layoutget *lgp = calldata; 9582 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9583 9584 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9585 &lgp->res.seq_res, task); 9586 } 9587 9588 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9589 { 9590 struct nfs4_layoutget *lgp = calldata; 9591 9592 nfs41_sequence_process(task, &lgp->res.seq_res); 9593 } 9594 9595 static int 9596 nfs4_layoutget_handle_exception(struct rpc_task *task, 9597 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9598 { 9599 struct inode *inode = lgp->args.inode; 9600 struct nfs_server *server = NFS_SERVER(inode); 9601 struct pnfs_layout_hdr *lo = lgp->lo; 9602 int nfs4err = task->tk_status; 9603 int err, status = 0; 9604 LIST_HEAD(head); 9605 9606 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9607 9608 nfs4_sequence_free_slot(&lgp->res.seq_res); 9609 9610 switch (nfs4err) { 9611 case 0: 9612 goto out; 9613 9614 /* 9615 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9616 * on the file. set tk_status to -ENODATA to tell upper layer to 9617 * retry go inband. 9618 */ 9619 case -NFS4ERR_LAYOUTUNAVAILABLE: 9620 status = -ENODATA; 9621 goto out; 9622 /* 9623 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9624 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9625 */ 9626 case -NFS4ERR_BADLAYOUT: 9627 status = -EOVERFLOW; 9628 goto out; 9629 /* 9630 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9631 * (or clients) writing to the same RAID stripe except when 9632 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9633 * 9634 * Treat it like we would RECALLCONFLICT -- we retry for a little 9635 * while, and then eventually give up. 9636 */ 9637 case -NFS4ERR_LAYOUTTRYLATER: 9638 if (lgp->args.minlength == 0) { 9639 status = -EOVERFLOW; 9640 goto out; 9641 } 9642 status = -EBUSY; 9643 break; 9644 case -NFS4ERR_RECALLCONFLICT: 9645 status = -ERECALLCONFLICT; 9646 break; 9647 case -NFS4ERR_DELEG_REVOKED: 9648 case -NFS4ERR_ADMIN_REVOKED: 9649 case -NFS4ERR_EXPIRED: 9650 case -NFS4ERR_BAD_STATEID: 9651 exception->timeout = 0; 9652 spin_lock(&inode->i_lock); 9653 /* If the open stateid was bad, then recover it. */ 9654 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9655 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9656 spin_unlock(&inode->i_lock); 9657 exception->state = lgp->args.ctx->state; 9658 exception->stateid = &lgp->args.stateid; 9659 break; 9660 } 9661 9662 /* 9663 * Mark the bad layout state as invalid, then retry 9664 */ 9665 pnfs_mark_layout_stateid_invalid(lo, &head); 9666 spin_unlock(&inode->i_lock); 9667 nfs_commit_inode(inode, 0); 9668 pnfs_free_lseg_list(&head); 9669 status = -EAGAIN; 9670 goto out; 9671 } 9672 9673 err = nfs4_handle_exception(server, nfs4err, exception); 9674 if (!status) { 9675 if (exception->retry) 9676 status = -EAGAIN; 9677 else 9678 status = err; 9679 } 9680 out: 9681 return status; 9682 } 9683 9684 size_t max_response_pages(struct nfs_server *server) 9685 { 9686 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9687 return nfs_page_array_len(0, max_resp_sz); 9688 } 9689 9690 static void nfs4_layoutget_release(void *calldata) 9691 { 9692 struct nfs4_layoutget *lgp = calldata; 9693 9694 nfs4_sequence_free_slot(&lgp->res.seq_res); 9695 pnfs_layoutget_free(lgp); 9696 } 9697 9698 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9699 .rpc_call_prepare = nfs4_layoutget_prepare, 9700 .rpc_call_done = nfs4_layoutget_done, 9701 .rpc_release = nfs4_layoutget_release, 9702 }; 9703 9704 struct pnfs_layout_segment * 9705 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9706 { 9707 struct inode *inode = lgp->args.inode; 9708 struct nfs_server *server = NFS_SERVER(inode); 9709 struct rpc_task *task; 9710 struct rpc_message msg = { 9711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9712 .rpc_argp = &lgp->args, 9713 .rpc_resp = &lgp->res, 9714 .rpc_cred = lgp->cred, 9715 }; 9716 struct rpc_task_setup task_setup_data = { 9717 .rpc_client = server->client, 9718 .rpc_message = &msg, 9719 .callback_ops = &nfs4_layoutget_call_ops, 9720 .callback_data = lgp, 9721 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9722 RPC_TASK_MOVEABLE, 9723 }; 9724 struct pnfs_layout_segment *lseg = NULL; 9725 struct nfs4_exception exception = { 9726 .inode = inode, 9727 .timeout = *timeout, 9728 }; 9729 int status = 0; 9730 9731 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9732 9733 task = rpc_run_task(&task_setup_data); 9734 if (IS_ERR(task)) 9735 return ERR_CAST(task); 9736 9737 status = rpc_wait_for_completion_task(task); 9738 if (status != 0) 9739 goto out; 9740 9741 if (task->tk_status < 0) { 9742 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9743 *timeout = exception.timeout; 9744 } else if (lgp->res.layoutp->len == 0) { 9745 status = -EAGAIN; 9746 *timeout = nfs4_update_delay(&exception.timeout); 9747 } else 9748 lseg = pnfs_layout_process(lgp); 9749 out: 9750 trace_nfs4_layoutget(lgp->args.ctx, 9751 &lgp->args.range, 9752 &lgp->res.range, 9753 &lgp->res.stateid, 9754 status); 9755 9756 rpc_put_task(task); 9757 dprintk("<-- %s status=%d\n", __func__, status); 9758 if (status) 9759 return ERR_PTR(status); 9760 return lseg; 9761 } 9762 9763 static void 9764 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9765 { 9766 struct nfs4_layoutreturn *lrp = calldata; 9767 9768 nfs4_setup_sequence(lrp->clp, 9769 &lrp->args.seq_args, 9770 &lrp->res.seq_res, 9771 task); 9772 if (!pnfs_layout_is_valid(lrp->args.layout)) 9773 rpc_exit(task, 0); 9774 } 9775 9776 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9777 { 9778 struct nfs4_layoutreturn *lrp = calldata; 9779 struct nfs_server *server; 9780 9781 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9782 return; 9783 9784 /* 9785 * Was there an RPC level error? Assume the call succeeded, 9786 * and that we need to release the layout 9787 */ 9788 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9789 lrp->res.lrs_present = 0; 9790 return; 9791 } 9792 9793 server = NFS_SERVER(lrp->args.inode); 9794 switch (task->tk_status) { 9795 case -NFS4ERR_OLD_STATEID: 9796 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9797 &lrp->args.range, 9798 lrp->args.inode)) 9799 goto out_restart; 9800 fallthrough; 9801 default: 9802 task->tk_status = 0; 9803 fallthrough; 9804 case 0: 9805 break; 9806 case -NFS4ERR_DELAY: 9807 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9808 break; 9809 goto out_restart; 9810 } 9811 return; 9812 out_restart: 9813 task->tk_status = 0; 9814 nfs4_sequence_free_slot(&lrp->res.seq_res); 9815 rpc_restart_call_prepare(task); 9816 } 9817 9818 static void nfs4_layoutreturn_release(void *calldata) 9819 { 9820 struct nfs4_layoutreturn *lrp = calldata; 9821 struct pnfs_layout_hdr *lo = lrp->args.layout; 9822 9823 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9824 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9825 nfs4_sequence_free_slot(&lrp->res.seq_res); 9826 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9827 lrp->ld_private.ops->free(&lrp->ld_private); 9828 pnfs_put_layout_hdr(lrp->args.layout); 9829 nfs_iput_and_deactive(lrp->inode); 9830 put_cred(lrp->cred); 9831 kfree(calldata); 9832 } 9833 9834 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9835 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9836 .rpc_call_done = nfs4_layoutreturn_done, 9837 .rpc_release = nfs4_layoutreturn_release, 9838 }; 9839 9840 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9841 { 9842 struct rpc_task *task; 9843 struct rpc_message msg = { 9844 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9845 .rpc_argp = &lrp->args, 9846 .rpc_resp = &lrp->res, 9847 .rpc_cred = lrp->cred, 9848 }; 9849 struct rpc_task_setup task_setup_data = { 9850 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9851 .rpc_message = &msg, 9852 .callback_ops = &nfs4_layoutreturn_call_ops, 9853 .callback_data = lrp, 9854 .flags = RPC_TASK_MOVEABLE, 9855 }; 9856 int status = 0; 9857 9858 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9859 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9860 &task_setup_data.rpc_client, &msg); 9861 9862 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9863 if (!sync) { 9864 if (!lrp->inode) { 9865 nfs4_layoutreturn_release(lrp); 9866 return -EAGAIN; 9867 } 9868 task_setup_data.flags |= RPC_TASK_ASYNC; 9869 } 9870 if (!lrp->inode) 9871 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9872 1); 9873 else 9874 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9875 0); 9876 task = rpc_run_task(&task_setup_data); 9877 if (IS_ERR(task)) 9878 return PTR_ERR(task); 9879 if (sync) 9880 status = task->tk_status; 9881 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9882 dprintk("<-- %s status=%d\n", __func__, status); 9883 rpc_put_task(task); 9884 return status; 9885 } 9886 9887 static int 9888 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9889 struct pnfs_device *pdev, 9890 const struct cred *cred) 9891 { 9892 struct nfs4_getdeviceinfo_args args = { 9893 .pdev = pdev, 9894 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9895 NOTIFY_DEVICEID4_DELETE, 9896 }; 9897 struct nfs4_getdeviceinfo_res res = { 9898 .pdev = pdev, 9899 }; 9900 struct rpc_message msg = { 9901 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9902 .rpc_argp = &args, 9903 .rpc_resp = &res, 9904 .rpc_cred = cred, 9905 }; 9906 int status; 9907 9908 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9909 if (res.notification & ~args.notify_types) 9910 dprintk("%s: unsupported notification\n", __func__); 9911 if (res.notification != args.notify_types) 9912 pdev->nocache = 1; 9913 9914 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9915 9916 dprintk("<-- %s status=%d\n", __func__, status); 9917 9918 return status; 9919 } 9920 9921 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9922 struct pnfs_device *pdev, 9923 const struct cred *cred) 9924 { 9925 struct nfs4_exception exception = { }; 9926 int err; 9927 9928 do { 9929 err = nfs4_handle_exception(server, 9930 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9931 &exception); 9932 } while (exception.retry); 9933 return err; 9934 } 9935 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9936 9937 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9938 { 9939 struct nfs4_layoutcommit_data *data = calldata; 9940 struct nfs_server *server = NFS_SERVER(data->args.inode); 9941 9942 nfs4_setup_sequence(server->nfs_client, 9943 &data->args.seq_args, 9944 &data->res.seq_res, 9945 task); 9946 } 9947 9948 static void 9949 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9950 { 9951 struct nfs4_layoutcommit_data *data = calldata; 9952 struct nfs_server *server = NFS_SERVER(data->args.inode); 9953 9954 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9955 return; 9956 9957 switch (task->tk_status) { /* Just ignore these failures */ 9958 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9959 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9960 case -NFS4ERR_BADLAYOUT: /* no layout */ 9961 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9962 task->tk_status = 0; 9963 break; 9964 case 0: 9965 break; 9966 default: 9967 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9968 rpc_restart_call_prepare(task); 9969 return; 9970 } 9971 } 9972 } 9973 9974 static void nfs4_layoutcommit_release(void *calldata) 9975 { 9976 struct nfs4_layoutcommit_data *data = calldata; 9977 9978 pnfs_cleanup_layoutcommit(data); 9979 nfs_post_op_update_inode_force_wcc(data->args.inode, 9980 data->res.fattr); 9981 put_cred(data->cred); 9982 nfs_iput_and_deactive(data->inode); 9983 kfree(data); 9984 } 9985 9986 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9987 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9988 .rpc_call_done = nfs4_layoutcommit_done, 9989 .rpc_release = nfs4_layoutcommit_release, 9990 }; 9991 9992 int 9993 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9994 { 9995 struct rpc_message msg = { 9996 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9997 .rpc_argp = &data->args, 9998 .rpc_resp = &data->res, 9999 .rpc_cred = data->cred, 10000 }; 10001 struct rpc_task_setup task_setup_data = { 10002 .task = &data->task, 10003 .rpc_client = NFS_CLIENT(data->args.inode), 10004 .rpc_message = &msg, 10005 .callback_ops = &nfs4_layoutcommit_ops, 10006 .callback_data = data, 10007 .flags = RPC_TASK_MOVEABLE, 10008 }; 10009 struct rpc_task *task; 10010 int status = 0; 10011 10012 dprintk("NFS: initiating layoutcommit call. sync %d " 10013 "lbw: %llu inode %lu\n", sync, 10014 data->args.lastbytewritten, 10015 data->args.inode->i_ino); 10016 10017 if (!sync) { 10018 data->inode = nfs_igrab_and_active(data->args.inode); 10019 if (data->inode == NULL) { 10020 nfs4_layoutcommit_release(data); 10021 return -EAGAIN; 10022 } 10023 task_setup_data.flags = RPC_TASK_ASYNC; 10024 } 10025 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10026 task = rpc_run_task(&task_setup_data); 10027 if (IS_ERR(task)) 10028 return PTR_ERR(task); 10029 if (sync) 10030 status = task->tk_status; 10031 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10032 dprintk("%s: status %d\n", __func__, status); 10033 rpc_put_task(task); 10034 return status; 10035 } 10036 10037 /* 10038 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10039 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10040 */ 10041 static int 10042 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10043 struct nfs_fsinfo *info, 10044 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10045 { 10046 struct nfs41_secinfo_no_name_args args = { 10047 .style = SECINFO_STYLE_CURRENT_FH, 10048 }; 10049 struct nfs4_secinfo_res res = { 10050 .flavors = flavors, 10051 }; 10052 struct rpc_message msg = { 10053 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10054 .rpc_argp = &args, 10055 .rpc_resp = &res, 10056 }; 10057 struct nfs4_call_sync_data data = { 10058 .seq_server = server, 10059 .seq_args = &args.seq_args, 10060 .seq_res = &res.seq_res, 10061 }; 10062 struct rpc_task_setup task_setup = { 10063 .rpc_client = server->client, 10064 .rpc_message = &msg, 10065 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10066 .callback_data = &data, 10067 .flags = RPC_TASK_NO_ROUND_ROBIN, 10068 }; 10069 const struct cred *cred = NULL; 10070 int status; 10071 10072 if (use_integrity) { 10073 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10074 10075 cred = nfs4_get_clid_cred(server->nfs_client); 10076 msg.rpc_cred = cred; 10077 } 10078 10079 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10080 status = nfs4_call_sync_custom(&task_setup); 10081 dprintk("<-- %s status=%d\n", __func__, status); 10082 10083 put_cred(cred); 10084 10085 return status; 10086 } 10087 10088 static int 10089 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10090 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10091 { 10092 struct nfs4_exception exception = { 10093 .interruptible = true, 10094 }; 10095 int err; 10096 do { 10097 /* first try using integrity protection */ 10098 err = -NFS4ERR_WRONGSEC; 10099 10100 /* try to use integrity protection with machine cred */ 10101 if (_nfs4_is_integrity_protected(server->nfs_client)) 10102 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10103 flavors, true); 10104 10105 /* 10106 * if unable to use integrity protection, or SECINFO with 10107 * integrity protection returns NFS4ERR_WRONGSEC (which is 10108 * disallowed by spec, but exists in deployed servers) use 10109 * the current filesystem's rpc_client and the user cred. 10110 */ 10111 if (err == -NFS4ERR_WRONGSEC) 10112 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10113 flavors, false); 10114 10115 switch (err) { 10116 case 0: 10117 case -NFS4ERR_WRONGSEC: 10118 case -ENOTSUPP: 10119 goto out; 10120 default: 10121 err = nfs4_handle_exception(server, err, &exception); 10122 } 10123 } while (exception.retry); 10124 out: 10125 return err; 10126 } 10127 10128 static int 10129 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10130 struct nfs_fsinfo *info) 10131 { 10132 int err; 10133 struct page *page; 10134 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10135 struct nfs4_secinfo_flavors *flavors; 10136 struct nfs4_secinfo4 *secinfo; 10137 int i; 10138 10139 page = alloc_page(GFP_KERNEL); 10140 if (!page) { 10141 err = -ENOMEM; 10142 goto out; 10143 } 10144 10145 flavors = page_address(page); 10146 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10147 10148 /* 10149 * Fall back on "guess and check" method if 10150 * the server doesn't support SECINFO_NO_NAME 10151 */ 10152 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10153 err = nfs4_find_root_sec(server, fhandle, info); 10154 goto out_freepage; 10155 } 10156 if (err) 10157 goto out_freepage; 10158 10159 for (i = 0; i < flavors->num_flavors; i++) { 10160 secinfo = &flavors->flavors[i]; 10161 10162 switch (secinfo->flavor) { 10163 case RPC_AUTH_NULL: 10164 case RPC_AUTH_UNIX: 10165 case RPC_AUTH_GSS: 10166 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10167 &secinfo->flavor_info); 10168 break; 10169 default: 10170 flavor = RPC_AUTH_MAXFLAVOR; 10171 break; 10172 } 10173 10174 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10175 flavor = RPC_AUTH_MAXFLAVOR; 10176 10177 if (flavor != RPC_AUTH_MAXFLAVOR) { 10178 err = nfs4_lookup_root_sec(server, fhandle, 10179 info, flavor); 10180 if (!err) 10181 break; 10182 } 10183 } 10184 10185 if (flavor == RPC_AUTH_MAXFLAVOR) 10186 err = -EPERM; 10187 10188 out_freepage: 10189 put_page(page); 10190 if (err == -EACCES) 10191 return -EPERM; 10192 out: 10193 return err; 10194 } 10195 10196 static int _nfs41_test_stateid(struct nfs_server *server, 10197 nfs4_stateid *stateid, 10198 const struct cred *cred) 10199 { 10200 int status; 10201 struct nfs41_test_stateid_args args = { 10202 .stateid = stateid, 10203 }; 10204 struct nfs41_test_stateid_res res; 10205 struct rpc_message msg = { 10206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10207 .rpc_argp = &args, 10208 .rpc_resp = &res, 10209 .rpc_cred = cred, 10210 }; 10211 struct rpc_clnt *rpc_client = server->client; 10212 10213 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10214 &rpc_client, &msg); 10215 10216 dprintk("NFS call test_stateid %p\n", stateid); 10217 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10218 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10219 &args.seq_args, &res.seq_res); 10220 if (status != NFS_OK) { 10221 dprintk("NFS reply test_stateid: failed, %d\n", status); 10222 return status; 10223 } 10224 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10225 return -res.status; 10226 } 10227 10228 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10229 int err, struct nfs4_exception *exception) 10230 { 10231 exception->retry = 0; 10232 switch(err) { 10233 case -NFS4ERR_DELAY: 10234 case -NFS4ERR_RETRY_UNCACHED_REP: 10235 nfs4_handle_exception(server, err, exception); 10236 break; 10237 case -NFS4ERR_BADSESSION: 10238 case -NFS4ERR_BADSLOT: 10239 case -NFS4ERR_BAD_HIGH_SLOT: 10240 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10241 case -NFS4ERR_DEADSESSION: 10242 nfs4_do_handle_exception(server, err, exception); 10243 } 10244 } 10245 10246 /** 10247 * nfs41_test_stateid - perform a TEST_STATEID operation 10248 * 10249 * @server: server / transport on which to perform the operation 10250 * @stateid: state ID to test 10251 * @cred: credential 10252 * 10253 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10254 * Otherwise a negative NFS4ERR value is returned if the operation 10255 * failed or the state ID is not currently valid. 10256 */ 10257 static int nfs41_test_stateid(struct nfs_server *server, 10258 nfs4_stateid *stateid, 10259 const struct cred *cred) 10260 { 10261 struct nfs4_exception exception = { 10262 .interruptible = true, 10263 }; 10264 int err; 10265 do { 10266 err = _nfs41_test_stateid(server, stateid, cred); 10267 nfs4_handle_delay_or_session_error(server, err, &exception); 10268 } while (exception.retry); 10269 return err; 10270 } 10271 10272 struct nfs_free_stateid_data { 10273 struct nfs_server *server; 10274 struct nfs41_free_stateid_args args; 10275 struct nfs41_free_stateid_res res; 10276 }; 10277 10278 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10279 { 10280 struct nfs_free_stateid_data *data = calldata; 10281 nfs4_setup_sequence(data->server->nfs_client, 10282 &data->args.seq_args, 10283 &data->res.seq_res, 10284 task); 10285 } 10286 10287 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10288 { 10289 struct nfs_free_stateid_data *data = calldata; 10290 10291 nfs41_sequence_done(task, &data->res.seq_res); 10292 10293 switch (task->tk_status) { 10294 case -NFS4ERR_DELAY: 10295 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10296 rpc_restart_call_prepare(task); 10297 } 10298 } 10299 10300 static void nfs41_free_stateid_release(void *calldata) 10301 { 10302 struct nfs_free_stateid_data *data = calldata; 10303 struct nfs_client *clp = data->server->nfs_client; 10304 10305 nfs_put_client(clp); 10306 kfree(calldata); 10307 } 10308 10309 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10310 .rpc_call_prepare = nfs41_free_stateid_prepare, 10311 .rpc_call_done = nfs41_free_stateid_done, 10312 .rpc_release = nfs41_free_stateid_release, 10313 }; 10314 10315 /** 10316 * nfs41_free_stateid - perform a FREE_STATEID operation 10317 * 10318 * @server: server / transport on which to perform the operation 10319 * @stateid: state ID to release 10320 * @cred: credential 10321 * @privileged: set to true if this call needs to be privileged 10322 * 10323 * Note: this function is always asynchronous. 10324 */ 10325 static int nfs41_free_stateid(struct nfs_server *server, 10326 const nfs4_stateid *stateid, 10327 const struct cred *cred, 10328 bool privileged) 10329 { 10330 struct rpc_message msg = { 10331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10332 .rpc_cred = cred, 10333 }; 10334 struct rpc_task_setup task_setup = { 10335 .rpc_client = server->client, 10336 .rpc_message = &msg, 10337 .callback_ops = &nfs41_free_stateid_ops, 10338 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10339 }; 10340 struct nfs_free_stateid_data *data; 10341 struct rpc_task *task; 10342 struct nfs_client *clp = server->nfs_client; 10343 10344 if (!refcount_inc_not_zero(&clp->cl_count)) 10345 return -EIO; 10346 10347 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10348 &task_setup.rpc_client, &msg); 10349 10350 dprintk("NFS call free_stateid %p\n", stateid); 10351 data = kmalloc(sizeof(*data), GFP_KERNEL); 10352 if (!data) 10353 return -ENOMEM; 10354 data->server = server; 10355 nfs4_stateid_copy(&data->args.stateid, stateid); 10356 10357 task_setup.callback_data = data; 10358 10359 msg.rpc_argp = &data->args; 10360 msg.rpc_resp = &data->res; 10361 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10362 task = rpc_run_task(&task_setup); 10363 if (IS_ERR(task)) 10364 return PTR_ERR(task); 10365 rpc_put_task(task); 10366 return 0; 10367 } 10368 10369 static void 10370 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10371 { 10372 const struct cred *cred = lsp->ls_state->owner->so_cred; 10373 10374 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10375 nfs4_free_lock_state(server, lsp); 10376 } 10377 10378 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10379 const nfs4_stateid *s2) 10380 { 10381 if (s1->type != s2->type) 10382 return false; 10383 10384 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10385 return false; 10386 10387 if (s1->seqid == s2->seqid) 10388 return true; 10389 10390 return s1->seqid == 0 || s2->seqid == 0; 10391 } 10392 10393 #endif /* CONFIG_NFS_V4_1 */ 10394 10395 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10396 const nfs4_stateid *s2) 10397 { 10398 return nfs4_stateid_match(s1, s2); 10399 } 10400 10401 10402 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10403 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10404 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10405 .recover_open = nfs4_open_reclaim, 10406 .recover_lock = nfs4_lock_reclaim, 10407 .establish_clid = nfs4_init_clientid, 10408 .detect_trunking = nfs40_discover_server_trunking, 10409 }; 10410 10411 #if defined(CONFIG_NFS_V4_1) 10412 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10413 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10414 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10415 .recover_open = nfs4_open_reclaim, 10416 .recover_lock = nfs4_lock_reclaim, 10417 .establish_clid = nfs41_init_clientid, 10418 .reclaim_complete = nfs41_proc_reclaim_complete, 10419 .detect_trunking = nfs41_discover_server_trunking, 10420 }; 10421 #endif /* CONFIG_NFS_V4_1 */ 10422 10423 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10424 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10425 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10426 .recover_open = nfs40_open_expired, 10427 .recover_lock = nfs4_lock_expired, 10428 .establish_clid = nfs4_init_clientid, 10429 }; 10430 10431 #if defined(CONFIG_NFS_V4_1) 10432 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10433 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10434 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10435 .recover_open = nfs41_open_expired, 10436 .recover_lock = nfs41_lock_expired, 10437 .establish_clid = nfs41_init_clientid, 10438 }; 10439 #endif /* CONFIG_NFS_V4_1 */ 10440 10441 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10442 .sched_state_renewal = nfs4_proc_async_renew, 10443 .get_state_renewal_cred = nfs4_get_renew_cred, 10444 .renew_lease = nfs4_proc_renew, 10445 }; 10446 10447 #if defined(CONFIG_NFS_V4_1) 10448 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10449 .sched_state_renewal = nfs41_proc_async_sequence, 10450 .get_state_renewal_cred = nfs4_get_machine_cred, 10451 .renew_lease = nfs4_proc_sequence, 10452 }; 10453 #endif 10454 10455 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10456 .get_locations = _nfs40_proc_get_locations, 10457 .fsid_present = _nfs40_proc_fsid_present, 10458 }; 10459 10460 #if defined(CONFIG_NFS_V4_1) 10461 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10462 .get_locations = _nfs41_proc_get_locations, 10463 .fsid_present = _nfs41_proc_fsid_present, 10464 }; 10465 #endif /* CONFIG_NFS_V4_1 */ 10466 10467 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10468 .minor_version = 0, 10469 .init_caps = NFS_CAP_READDIRPLUS 10470 | NFS_CAP_ATOMIC_OPEN 10471 | NFS_CAP_POSIX_LOCK, 10472 .init_client = nfs40_init_client, 10473 .shutdown_client = nfs40_shutdown_client, 10474 .match_stateid = nfs4_match_stateid, 10475 .find_root_sec = nfs4_find_root_sec, 10476 .free_lock_state = nfs4_release_lockowner, 10477 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10478 .alloc_seqid = nfs_alloc_seqid, 10479 .call_sync_ops = &nfs40_call_sync_ops, 10480 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10481 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10482 .state_renewal_ops = &nfs40_state_renewal_ops, 10483 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10484 }; 10485 10486 #if defined(CONFIG_NFS_V4_1) 10487 static struct nfs_seqid * 10488 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10489 { 10490 return NULL; 10491 } 10492 10493 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10494 .minor_version = 1, 10495 .init_caps = NFS_CAP_READDIRPLUS 10496 | NFS_CAP_ATOMIC_OPEN 10497 | NFS_CAP_POSIX_LOCK 10498 | NFS_CAP_STATEID_NFSV41 10499 | NFS_CAP_ATOMIC_OPEN_V1 10500 | NFS_CAP_LGOPEN 10501 | NFS_CAP_MOVEABLE, 10502 .init_client = nfs41_init_client, 10503 .shutdown_client = nfs41_shutdown_client, 10504 .match_stateid = nfs41_match_stateid, 10505 .find_root_sec = nfs41_find_root_sec, 10506 .free_lock_state = nfs41_free_lock_state, 10507 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10508 .alloc_seqid = nfs_alloc_no_seqid, 10509 .session_trunk = nfs4_test_session_trunk, 10510 .call_sync_ops = &nfs41_call_sync_ops, 10511 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10512 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10513 .state_renewal_ops = &nfs41_state_renewal_ops, 10514 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10515 }; 10516 #endif 10517 10518 #if defined(CONFIG_NFS_V4_2) 10519 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10520 .minor_version = 2, 10521 .init_caps = NFS_CAP_READDIRPLUS 10522 | NFS_CAP_ATOMIC_OPEN 10523 | NFS_CAP_POSIX_LOCK 10524 | NFS_CAP_STATEID_NFSV41 10525 | NFS_CAP_ATOMIC_OPEN_V1 10526 | NFS_CAP_LGOPEN 10527 | NFS_CAP_ALLOCATE 10528 | NFS_CAP_COPY 10529 | NFS_CAP_OFFLOAD_CANCEL 10530 | NFS_CAP_COPY_NOTIFY 10531 | NFS_CAP_DEALLOCATE 10532 | NFS_CAP_SEEK 10533 | NFS_CAP_LAYOUTSTATS 10534 | NFS_CAP_CLONE 10535 | NFS_CAP_LAYOUTERROR 10536 | NFS_CAP_READ_PLUS 10537 | NFS_CAP_MOVEABLE, 10538 .init_client = nfs41_init_client, 10539 .shutdown_client = nfs41_shutdown_client, 10540 .match_stateid = nfs41_match_stateid, 10541 .find_root_sec = nfs41_find_root_sec, 10542 .free_lock_state = nfs41_free_lock_state, 10543 .call_sync_ops = &nfs41_call_sync_ops, 10544 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10545 .alloc_seqid = nfs_alloc_no_seqid, 10546 .session_trunk = nfs4_test_session_trunk, 10547 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10548 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10549 .state_renewal_ops = &nfs41_state_renewal_ops, 10550 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10551 }; 10552 #endif 10553 10554 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10555 [0] = &nfs_v4_0_minor_ops, 10556 #if defined(CONFIG_NFS_V4_1) 10557 [1] = &nfs_v4_1_minor_ops, 10558 #endif 10559 #if defined(CONFIG_NFS_V4_2) 10560 [2] = &nfs_v4_2_minor_ops, 10561 #endif 10562 }; 10563 10564 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10565 { 10566 ssize_t error, error2, error3; 10567 10568 error = generic_listxattr(dentry, list, size); 10569 if (error < 0) 10570 return error; 10571 if (list) { 10572 list += error; 10573 size -= error; 10574 } 10575 10576 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10577 if (error2 < 0) 10578 return error2; 10579 10580 if (list) { 10581 list += error2; 10582 size -= error2; 10583 } 10584 10585 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10586 if (error3 < 0) 10587 return error3; 10588 10589 return error + error2 + error3; 10590 } 10591 10592 static void nfs4_enable_swap(struct inode *inode) 10593 { 10594 /* The state manager thread must always be running. 10595 * It will notice the client is a swapper, and stay put. 10596 */ 10597 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10598 10599 nfs4_schedule_state_manager(clp); 10600 } 10601 10602 static void nfs4_disable_swap(struct inode *inode) 10603 { 10604 /* The state manager thread will now exit once it is 10605 * woken. 10606 */ 10607 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10608 10609 nfs4_schedule_state_manager(clp); 10610 } 10611 10612 static const struct inode_operations nfs4_dir_inode_operations = { 10613 .create = nfs_create, 10614 .lookup = nfs_lookup, 10615 .atomic_open = nfs_atomic_open, 10616 .link = nfs_link, 10617 .unlink = nfs_unlink, 10618 .symlink = nfs_symlink, 10619 .mkdir = nfs_mkdir, 10620 .rmdir = nfs_rmdir, 10621 .mknod = nfs_mknod, 10622 .rename = nfs_rename, 10623 .permission = nfs_permission, 10624 .getattr = nfs_getattr, 10625 .setattr = nfs_setattr, 10626 .listxattr = nfs4_listxattr, 10627 }; 10628 10629 static const struct inode_operations nfs4_file_inode_operations = { 10630 .permission = nfs_permission, 10631 .getattr = nfs_getattr, 10632 .setattr = nfs_setattr, 10633 .listxattr = nfs4_listxattr, 10634 }; 10635 10636 const struct nfs_rpc_ops nfs_v4_clientops = { 10637 .version = 4, /* protocol version */ 10638 .dentry_ops = &nfs4_dentry_operations, 10639 .dir_inode_ops = &nfs4_dir_inode_operations, 10640 .file_inode_ops = &nfs4_file_inode_operations, 10641 .file_ops = &nfs4_file_operations, 10642 .getroot = nfs4_proc_get_root, 10643 .submount = nfs4_submount, 10644 .try_get_tree = nfs4_try_get_tree, 10645 .getattr = nfs4_proc_getattr, 10646 .setattr = nfs4_proc_setattr, 10647 .lookup = nfs4_proc_lookup, 10648 .lookupp = nfs4_proc_lookupp, 10649 .access = nfs4_proc_access, 10650 .readlink = nfs4_proc_readlink, 10651 .create = nfs4_proc_create, 10652 .remove = nfs4_proc_remove, 10653 .unlink_setup = nfs4_proc_unlink_setup, 10654 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10655 .unlink_done = nfs4_proc_unlink_done, 10656 .rename_setup = nfs4_proc_rename_setup, 10657 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10658 .rename_done = nfs4_proc_rename_done, 10659 .link = nfs4_proc_link, 10660 .symlink = nfs4_proc_symlink, 10661 .mkdir = nfs4_proc_mkdir, 10662 .rmdir = nfs4_proc_rmdir, 10663 .readdir = nfs4_proc_readdir, 10664 .mknod = nfs4_proc_mknod, 10665 .statfs = nfs4_proc_statfs, 10666 .fsinfo = nfs4_proc_fsinfo, 10667 .pathconf = nfs4_proc_pathconf, 10668 .set_capabilities = nfs4_server_capabilities, 10669 .decode_dirent = nfs4_decode_dirent, 10670 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10671 .read_setup = nfs4_proc_read_setup, 10672 .read_done = nfs4_read_done, 10673 .write_setup = nfs4_proc_write_setup, 10674 .write_done = nfs4_write_done, 10675 .commit_setup = nfs4_proc_commit_setup, 10676 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10677 .commit_done = nfs4_commit_done, 10678 .lock = nfs4_proc_lock, 10679 .clear_acl_cache = nfs4_zap_acl_attr, 10680 .close_context = nfs4_close_context, 10681 .open_context = nfs4_atomic_open, 10682 .have_delegation = nfs4_have_delegation, 10683 .alloc_client = nfs4_alloc_client, 10684 .init_client = nfs4_init_client, 10685 .free_client = nfs4_free_client, 10686 .create_server = nfs4_create_server, 10687 .clone_server = nfs_clone_server, 10688 .discover_trunking = nfs4_discover_trunking, 10689 .enable_swap = nfs4_enable_swap, 10690 .disable_swap = nfs4_disable_swap, 10691 }; 10692 10693 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10694 .name = XATTR_NAME_NFSV4_ACL, 10695 .list = nfs4_xattr_list_nfs4_acl, 10696 .get = nfs4_xattr_get_nfs4_acl, 10697 .set = nfs4_xattr_set_nfs4_acl, 10698 }; 10699 10700 #if defined(CONFIG_NFS_V4_1) 10701 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10702 .name = XATTR_NAME_NFSV4_DACL, 10703 .list = nfs4_xattr_list_nfs4_dacl, 10704 .get = nfs4_xattr_get_nfs4_dacl, 10705 .set = nfs4_xattr_set_nfs4_dacl, 10706 }; 10707 10708 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10709 .name = XATTR_NAME_NFSV4_SACL, 10710 .list = nfs4_xattr_list_nfs4_sacl, 10711 .get = nfs4_xattr_get_nfs4_sacl, 10712 .set = nfs4_xattr_set_nfs4_sacl, 10713 }; 10714 #endif 10715 10716 #ifdef CONFIG_NFS_V4_2 10717 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10718 .prefix = XATTR_USER_PREFIX, 10719 .get = nfs4_xattr_get_nfs4_user, 10720 .set = nfs4_xattr_set_nfs4_user, 10721 }; 10722 #endif 10723 10724 const struct xattr_handler *nfs4_xattr_handlers[] = { 10725 &nfs4_xattr_nfs4_acl_handler, 10726 #if defined(CONFIG_NFS_V4_1) 10727 &nfs4_xattr_nfs4_dacl_handler, 10728 &nfs4_xattr_nfs4_sacl_handler, 10729 #endif 10730 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10731 &nfs4_xattr_nfs4_label_handler, 10732 #endif 10733 #ifdef CONFIG_NFS_V4_2 10734 &nfs4_xattr_nfs4_user_handler, 10735 #endif 10736 NULL 10737 }; 10738