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 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state); 925 nfs4_schedule_session_recovery(session, status); 926 dprintk("%s ERROR: %d Reset session\n", __func__, status); 927 nfs41_sequence_free_slot(res); 928 goto out; 929 retry_new_seq: 930 ++slot->seq_nr; 931 retry_nowait: 932 if (rpc_restart_call_prepare(task)) { 933 nfs41_sequence_free_slot(res); 934 task->tk_status = 0; 935 ret = 0; 936 } 937 goto out; 938 out_retry: 939 if (!rpc_restart_call(task)) 940 goto out; 941 rpc_delay(task, NFS4_POLL_RETRY_MAX); 942 return 0; 943 } 944 945 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 946 { 947 if (!nfs41_sequence_process(task, res)) 948 return 0; 949 if (res->sr_slot != NULL) 950 nfs41_sequence_free_slot(res); 951 return 1; 952 953 } 954 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 955 956 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 957 { 958 if (res->sr_slot == NULL) 959 return 1; 960 if (res->sr_slot->table->session != NULL) 961 return nfs41_sequence_process(task, res); 962 return nfs40_sequence_done(task, res); 963 } 964 965 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 966 { 967 if (res->sr_slot != NULL) { 968 if (res->sr_slot->table->session != NULL) 969 nfs41_sequence_free_slot(res); 970 else 971 nfs40_sequence_free_slot(res); 972 } 973 } 974 975 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 976 { 977 if (res->sr_slot == NULL) 978 return 1; 979 if (!res->sr_slot->table->session) 980 return nfs40_sequence_done(task, res); 981 return nfs41_sequence_done(task, res); 982 } 983 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 984 985 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 986 { 987 struct nfs4_call_sync_data *data = calldata; 988 989 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 990 991 nfs4_setup_sequence(data->seq_server->nfs_client, 992 data->seq_args, data->seq_res, task); 993 } 994 995 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 996 { 997 struct nfs4_call_sync_data *data = calldata; 998 999 nfs41_sequence_done(task, data->seq_res); 1000 } 1001 1002 static const struct rpc_call_ops nfs41_call_sync_ops = { 1003 .rpc_call_prepare = nfs41_call_sync_prepare, 1004 .rpc_call_done = nfs41_call_sync_done, 1005 }; 1006 1007 #else /* !CONFIG_NFS_V4_1 */ 1008 1009 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1010 { 1011 return nfs40_sequence_done(task, res); 1012 } 1013 1014 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1015 { 1016 if (res->sr_slot != NULL) 1017 nfs40_sequence_free_slot(res); 1018 } 1019 1020 int nfs4_sequence_done(struct rpc_task *task, 1021 struct nfs4_sequence_res *res) 1022 { 1023 return nfs40_sequence_done(task, res); 1024 } 1025 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1026 1027 #endif /* !CONFIG_NFS_V4_1 */ 1028 1029 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1030 { 1031 res->sr_timestamp = jiffies; 1032 res->sr_status_flags = 0; 1033 res->sr_status = 1; 1034 } 1035 1036 static 1037 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1038 struct nfs4_sequence_res *res, 1039 struct nfs4_slot *slot) 1040 { 1041 if (!slot) 1042 return; 1043 slot->privileged = args->sa_privileged ? 1 : 0; 1044 args->sa_slot = slot; 1045 1046 res->sr_slot = slot; 1047 } 1048 1049 int nfs4_setup_sequence(struct nfs_client *client, 1050 struct nfs4_sequence_args *args, 1051 struct nfs4_sequence_res *res, 1052 struct rpc_task *task) 1053 { 1054 struct nfs4_session *session = nfs4_get_session(client); 1055 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1056 struct nfs4_slot *slot; 1057 1058 /* slot already allocated? */ 1059 if (res->sr_slot != NULL) 1060 goto out_start; 1061 1062 if (session) 1063 tbl = &session->fc_slot_table; 1064 1065 spin_lock(&tbl->slot_tbl_lock); 1066 /* The state manager will wait until the slot table is empty */ 1067 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1068 goto out_sleep; 1069 1070 slot = nfs4_alloc_slot(tbl); 1071 if (IS_ERR(slot)) { 1072 if (slot == ERR_PTR(-ENOMEM)) 1073 goto out_sleep_timeout; 1074 goto out_sleep; 1075 } 1076 spin_unlock(&tbl->slot_tbl_lock); 1077 1078 nfs4_sequence_attach_slot(args, res, slot); 1079 1080 trace_nfs4_setup_sequence(session, args); 1081 out_start: 1082 nfs41_sequence_res_init(res); 1083 rpc_call_start(task); 1084 return 0; 1085 out_sleep_timeout: 1086 /* Try again in 1/4 second */ 1087 if (args->sa_privileged) 1088 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1089 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1090 else 1091 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1092 NULL, jiffies + (HZ >> 2)); 1093 spin_unlock(&tbl->slot_tbl_lock); 1094 return -EAGAIN; 1095 out_sleep: 1096 if (args->sa_privileged) 1097 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1098 RPC_PRIORITY_PRIVILEGED); 1099 else 1100 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1101 spin_unlock(&tbl->slot_tbl_lock); 1102 return -EAGAIN; 1103 } 1104 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1105 1106 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1107 { 1108 struct nfs4_call_sync_data *data = calldata; 1109 nfs4_setup_sequence(data->seq_server->nfs_client, 1110 data->seq_args, data->seq_res, task); 1111 } 1112 1113 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1114 { 1115 struct nfs4_call_sync_data *data = calldata; 1116 nfs4_sequence_done(task, data->seq_res); 1117 } 1118 1119 static const struct rpc_call_ops nfs40_call_sync_ops = { 1120 .rpc_call_prepare = nfs40_call_sync_prepare, 1121 .rpc_call_done = nfs40_call_sync_done, 1122 }; 1123 1124 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1125 { 1126 int ret; 1127 struct rpc_task *task; 1128 1129 task = rpc_run_task(task_setup); 1130 if (IS_ERR(task)) 1131 return PTR_ERR(task); 1132 1133 ret = task->tk_status; 1134 rpc_put_task(task); 1135 return ret; 1136 } 1137 1138 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1139 struct nfs_server *server, 1140 struct rpc_message *msg, 1141 struct nfs4_sequence_args *args, 1142 struct nfs4_sequence_res *res, 1143 unsigned short task_flags) 1144 { 1145 struct nfs_client *clp = server->nfs_client; 1146 struct nfs4_call_sync_data data = { 1147 .seq_server = server, 1148 .seq_args = args, 1149 .seq_res = res, 1150 }; 1151 struct rpc_task_setup task_setup = { 1152 .rpc_client = clnt, 1153 .rpc_message = msg, 1154 .callback_ops = clp->cl_mvops->call_sync_ops, 1155 .callback_data = &data, 1156 .flags = task_flags, 1157 }; 1158 1159 return nfs4_call_sync_custom(&task_setup); 1160 } 1161 1162 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1163 struct nfs_server *server, 1164 struct rpc_message *msg, 1165 struct nfs4_sequence_args *args, 1166 struct nfs4_sequence_res *res) 1167 { 1168 unsigned short task_flags = 0; 1169 1170 if (server->caps & NFS_CAP_MOVEABLE) 1171 task_flags = RPC_TASK_MOVEABLE; 1172 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1173 } 1174 1175 1176 int nfs4_call_sync(struct rpc_clnt *clnt, 1177 struct nfs_server *server, 1178 struct rpc_message *msg, 1179 struct nfs4_sequence_args *args, 1180 struct nfs4_sequence_res *res, 1181 int cache_reply) 1182 { 1183 nfs4_init_sequence(args, res, cache_reply, 0); 1184 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1185 } 1186 1187 static void 1188 nfs4_inc_nlink_locked(struct inode *inode) 1189 { 1190 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1191 NFS_INO_INVALID_CTIME | 1192 NFS_INO_INVALID_NLINK); 1193 inc_nlink(inode); 1194 } 1195 1196 static void 1197 nfs4_inc_nlink(struct inode *inode) 1198 { 1199 spin_lock(&inode->i_lock); 1200 nfs4_inc_nlink_locked(inode); 1201 spin_unlock(&inode->i_lock); 1202 } 1203 1204 static void 1205 nfs4_dec_nlink_locked(struct inode *inode) 1206 { 1207 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1208 NFS_INO_INVALID_CTIME | 1209 NFS_INO_INVALID_NLINK); 1210 drop_nlink(inode); 1211 } 1212 1213 static void 1214 nfs4_update_changeattr_locked(struct inode *inode, 1215 struct nfs4_change_info *cinfo, 1216 unsigned long timestamp, unsigned long cache_validity) 1217 { 1218 struct nfs_inode *nfsi = NFS_I(inode); 1219 u64 change_attr = inode_peek_iversion_raw(inode); 1220 1221 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1222 if (S_ISDIR(inode->i_mode)) 1223 cache_validity |= NFS_INO_INVALID_DATA; 1224 1225 switch (NFS_SERVER(inode)->change_attr_type) { 1226 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1227 if (cinfo->after == change_attr) 1228 goto out; 1229 break; 1230 default: 1231 if ((s64)(change_attr - cinfo->after) >= 0) 1232 goto out; 1233 } 1234 1235 inode_set_iversion_raw(inode, cinfo->after); 1236 if (!cinfo->atomic || cinfo->before != change_attr) { 1237 if (S_ISDIR(inode->i_mode)) 1238 nfs_force_lookup_revalidate(inode); 1239 1240 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1241 cache_validity |= 1242 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1243 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1244 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1245 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1246 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1247 } 1248 nfsi->attrtimeo_timestamp = jiffies; 1249 nfsi->read_cache_jiffies = timestamp; 1250 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1251 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1252 out: 1253 nfs_set_cache_invalid(inode, cache_validity); 1254 } 1255 1256 void 1257 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1258 unsigned long timestamp, unsigned long cache_validity) 1259 { 1260 spin_lock(&dir->i_lock); 1261 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1262 spin_unlock(&dir->i_lock); 1263 } 1264 1265 struct nfs4_open_createattrs { 1266 struct nfs4_label *label; 1267 struct iattr *sattr; 1268 const __u32 verf[2]; 1269 }; 1270 1271 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1272 int err, struct nfs4_exception *exception) 1273 { 1274 if (err != -EINVAL) 1275 return false; 1276 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1277 return false; 1278 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1279 exception->retry = 1; 1280 return true; 1281 } 1282 1283 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1284 { 1285 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1286 } 1287 1288 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1289 { 1290 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1291 1292 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1293 } 1294 1295 static u32 1296 nfs4_map_atomic_open_share(struct nfs_server *server, 1297 fmode_t fmode, int openflags) 1298 { 1299 u32 res = 0; 1300 1301 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1302 case FMODE_READ: 1303 res = NFS4_SHARE_ACCESS_READ; 1304 break; 1305 case FMODE_WRITE: 1306 res = NFS4_SHARE_ACCESS_WRITE; 1307 break; 1308 case FMODE_READ|FMODE_WRITE: 1309 res = NFS4_SHARE_ACCESS_BOTH; 1310 } 1311 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1312 goto out; 1313 /* Want no delegation if we're using O_DIRECT */ 1314 if (openflags & O_DIRECT) 1315 res |= NFS4_SHARE_WANT_NO_DELEG; 1316 out: 1317 return res; 1318 } 1319 1320 static enum open_claim_type4 1321 nfs4_map_atomic_open_claim(struct nfs_server *server, 1322 enum open_claim_type4 claim) 1323 { 1324 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1325 return claim; 1326 switch (claim) { 1327 default: 1328 return claim; 1329 case NFS4_OPEN_CLAIM_FH: 1330 return NFS4_OPEN_CLAIM_NULL; 1331 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1332 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1333 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1334 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1335 } 1336 } 1337 1338 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1339 { 1340 p->o_res.f_attr = &p->f_attr; 1341 p->o_res.seqid = p->o_arg.seqid; 1342 p->c_res.seqid = p->c_arg.seqid; 1343 p->o_res.server = p->o_arg.server; 1344 p->o_res.access_request = p->o_arg.access; 1345 nfs_fattr_init(&p->f_attr); 1346 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1347 } 1348 1349 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1350 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1351 const struct nfs4_open_createattrs *c, 1352 enum open_claim_type4 claim, 1353 gfp_t gfp_mask) 1354 { 1355 struct dentry *parent = dget_parent(dentry); 1356 struct inode *dir = d_inode(parent); 1357 struct nfs_server *server = NFS_SERVER(dir); 1358 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1359 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1360 struct nfs4_opendata *p; 1361 1362 p = kzalloc(sizeof(*p), gfp_mask); 1363 if (p == NULL) 1364 goto err; 1365 1366 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1367 if (IS_ERR(p->f_attr.label)) 1368 goto err_free_p; 1369 1370 p->a_label = nfs4_label_alloc(server, gfp_mask); 1371 if (IS_ERR(p->a_label)) 1372 goto err_free_f; 1373 1374 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1375 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1376 if (IS_ERR(p->o_arg.seqid)) 1377 goto err_free_label; 1378 nfs_sb_active(dentry->d_sb); 1379 p->dentry = dget(dentry); 1380 p->dir = parent; 1381 p->owner = sp; 1382 atomic_inc(&sp->so_count); 1383 p->o_arg.open_flags = flags; 1384 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1385 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1386 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1387 fmode, flags); 1388 if (flags & O_CREAT) { 1389 p->o_arg.umask = current_umask(); 1390 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1391 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1392 p->o_arg.u.attrs = &p->attrs; 1393 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1394 1395 memcpy(p->o_arg.u.verifier.data, c->verf, 1396 sizeof(p->o_arg.u.verifier.data)); 1397 } 1398 } 1399 /* ask server to check for all possible rights as results 1400 * are cached */ 1401 switch (p->o_arg.claim) { 1402 default: 1403 break; 1404 case NFS4_OPEN_CLAIM_NULL: 1405 case NFS4_OPEN_CLAIM_FH: 1406 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1407 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1408 NFS4_ACCESS_EXECUTE | 1409 nfs_access_xattr_mask(server); 1410 } 1411 p->o_arg.clientid = server->nfs_client->cl_clientid; 1412 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1413 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1414 p->o_arg.name = &dentry->d_name; 1415 p->o_arg.server = server; 1416 p->o_arg.bitmask = nfs4_bitmask(server, label); 1417 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1418 switch (p->o_arg.claim) { 1419 case NFS4_OPEN_CLAIM_NULL: 1420 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1421 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1422 p->o_arg.fh = NFS_FH(dir); 1423 break; 1424 case NFS4_OPEN_CLAIM_PREVIOUS: 1425 case NFS4_OPEN_CLAIM_FH: 1426 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1427 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1428 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1429 } 1430 p->c_arg.fh = &p->o_res.fh; 1431 p->c_arg.stateid = &p->o_res.stateid; 1432 p->c_arg.seqid = p->o_arg.seqid; 1433 nfs4_init_opendata_res(p); 1434 kref_init(&p->kref); 1435 return p; 1436 1437 err_free_label: 1438 nfs4_label_free(p->a_label); 1439 err_free_f: 1440 nfs4_label_free(p->f_attr.label); 1441 err_free_p: 1442 kfree(p); 1443 err: 1444 dput(parent); 1445 return NULL; 1446 } 1447 1448 static void nfs4_opendata_free(struct kref *kref) 1449 { 1450 struct nfs4_opendata *p = container_of(kref, 1451 struct nfs4_opendata, kref); 1452 struct super_block *sb = p->dentry->d_sb; 1453 1454 nfs4_lgopen_release(p->lgp); 1455 nfs_free_seqid(p->o_arg.seqid); 1456 nfs4_sequence_free_slot(&p->o_res.seq_res); 1457 if (p->state != NULL) 1458 nfs4_put_open_state(p->state); 1459 nfs4_put_state_owner(p->owner); 1460 1461 nfs4_label_free(p->a_label); 1462 nfs4_label_free(p->f_attr.label); 1463 1464 dput(p->dir); 1465 dput(p->dentry); 1466 nfs_sb_deactive(sb); 1467 nfs_fattr_free_names(&p->f_attr); 1468 kfree(p->f_attr.mdsthreshold); 1469 kfree(p); 1470 } 1471 1472 static void nfs4_opendata_put(struct nfs4_opendata *p) 1473 { 1474 if (p != NULL) 1475 kref_put(&p->kref, nfs4_opendata_free); 1476 } 1477 1478 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1479 fmode_t fmode) 1480 { 1481 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1482 case FMODE_READ|FMODE_WRITE: 1483 return state->n_rdwr != 0; 1484 case FMODE_WRITE: 1485 return state->n_wronly != 0; 1486 case FMODE_READ: 1487 return state->n_rdonly != 0; 1488 } 1489 WARN_ON_ONCE(1); 1490 return false; 1491 } 1492 1493 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1494 int open_mode, enum open_claim_type4 claim) 1495 { 1496 int ret = 0; 1497 1498 if (open_mode & (O_EXCL|O_TRUNC)) 1499 goto out; 1500 switch (claim) { 1501 case NFS4_OPEN_CLAIM_NULL: 1502 case NFS4_OPEN_CLAIM_FH: 1503 goto out; 1504 default: 1505 break; 1506 } 1507 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1508 case FMODE_READ: 1509 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1510 && state->n_rdonly != 0; 1511 break; 1512 case FMODE_WRITE: 1513 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1514 && state->n_wronly != 0; 1515 break; 1516 case FMODE_READ|FMODE_WRITE: 1517 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1518 && state->n_rdwr != 0; 1519 } 1520 out: 1521 return ret; 1522 } 1523 1524 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1525 enum open_claim_type4 claim) 1526 { 1527 if (delegation == NULL) 1528 return 0; 1529 if ((delegation->type & fmode) != fmode) 1530 return 0; 1531 switch (claim) { 1532 case NFS4_OPEN_CLAIM_NULL: 1533 case NFS4_OPEN_CLAIM_FH: 1534 break; 1535 case NFS4_OPEN_CLAIM_PREVIOUS: 1536 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1537 break; 1538 fallthrough; 1539 default: 1540 return 0; 1541 } 1542 nfs_mark_delegation_referenced(delegation); 1543 return 1; 1544 } 1545 1546 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1547 { 1548 switch (fmode) { 1549 case FMODE_WRITE: 1550 state->n_wronly++; 1551 break; 1552 case FMODE_READ: 1553 state->n_rdonly++; 1554 break; 1555 case FMODE_READ|FMODE_WRITE: 1556 state->n_rdwr++; 1557 } 1558 nfs4_state_set_mode_locked(state, state->state | fmode); 1559 } 1560 1561 #ifdef CONFIG_NFS_V4_1 1562 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1563 { 1564 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1565 return true; 1566 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1567 return true; 1568 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1569 return true; 1570 return false; 1571 } 1572 #endif /* CONFIG_NFS_V4_1 */ 1573 1574 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1575 { 1576 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1577 wake_up_all(&state->waitq); 1578 } 1579 1580 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1581 { 1582 struct nfs_client *clp = state->owner->so_server->nfs_client; 1583 bool need_recover = false; 1584 1585 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1586 need_recover = true; 1587 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1588 need_recover = true; 1589 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1590 need_recover = true; 1591 if (need_recover) 1592 nfs4_state_mark_reclaim_nograce(clp, state); 1593 } 1594 1595 /* 1596 * Check for whether or not the caller may update the open stateid 1597 * to the value passed in by stateid. 1598 * 1599 * Note: This function relies heavily on the server implementing 1600 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1601 * correctly. 1602 * i.e. The stateid seqids have to be initialised to 1, and 1603 * are then incremented on every state transition. 1604 */ 1605 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1606 const nfs4_stateid *stateid) 1607 { 1608 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1609 /* The common case - we're updating to a new sequence number */ 1610 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1611 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1612 return true; 1613 return false; 1614 } 1615 /* The server returned a new stateid */ 1616 } 1617 /* This is the first OPEN in this generation */ 1618 if (stateid->seqid == cpu_to_be32(1)) 1619 return true; 1620 return false; 1621 } 1622 1623 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1624 { 1625 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1626 return; 1627 if (state->n_wronly) 1628 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1629 if (state->n_rdonly) 1630 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1631 if (state->n_rdwr) 1632 set_bit(NFS_O_RDWR_STATE, &state->flags); 1633 set_bit(NFS_OPEN_STATE, &state->flags); 1634 } 1635 1636 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1637 nfs4_stateid *stateid, fmode_t fmode) 1638 { 1639 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1640 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1641 case FMODE_WRITE: 1642 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1643 break; 1644 case FMODE_READ: 1645 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1646 break; 1647 case 0: 1648 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1649 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1650 clear_bit(NFS_OPEN_STATE, &state->flags); 1651 } 1652 if (stateid == NULL) 1653 return; 1654 /* Handle OPEN+OPEN_DOWNGRADE races */ 1655 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1656 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1657 nfs_resync_open_stateid_locked(state); 1658 goto out; 1659 } 1660 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1661 nfs4_stateid_copy(&state->stateid, stateid); 1662 nfs4_stateid_copy(&state->open_stateid, stateid); 1663 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1664 out: 1665 nfs_state_log_update_open_stateid(state); 1666 } 1667 1668 static void nfs_clear_open_stateid(struct nfs4_state *state, 1669 nfs4_stateid *arg_stateid, 1670 nfs4_stateid *stateid, fmode_t fmode) 1671 { 1672 write_seqlock(&state->seqlock); 1673 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1674 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1675 nfs_clear_open_stateid_locked(state, stateid, fmode); 1676 write_sequnlock(&state->seqlock); 1677 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1678 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1679 } 1680 1681 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1682 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1683 __must_hold(&state->owner->so_lock) 1684 __must_hold(&state->seqlock) 1685 __must_hold(RCU) 1686 1687 { 1688 DEFINE_WAIT(wait); 1689 int status = 0; 1690 for (;;) { 1691 1692 if (nfs_stateid_is_sequential(state, stateid)) 1693 break; 1694 1695 if (status) 1696 break; 1697 /* Rely on seqids for serialisation with NFSv4.0 */ 1698 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1699 break; 1700 1701 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1702 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1703 /* 1704 * Ensure we process the state changes in the same order 1705 * in which the server processed them by delaying the 1706 * update of the stateid until we are in sequence. 1707 */ 1708 write_sequnlock(&state->seqlock); 1709 spin_unlock(&state->owner->so_lock); 1710 rcu_read_unlock(); 1711 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1712 1713 if (!fatal_signal_pending(current)) { 1714 if (schedule_timeout(5*HZ) == 0) 1715 status = -EAGAIN; 1716 else 1717 status = 0; 1718 } else 1719 status = -EINTR; 1720 finish_wait(&state->waitq, &wait); 1721 rcu_read_lock(); 1722 spin_lock(&state->owner->so_lock); 1723 write_seqlock(&state->seqlock); 1724 } 1725 1726 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1727 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1728 nfs4_stateid_copy(freeme, &state->open_stateid); 1729 nfs_test_and_clear_all_open_stateid(state); 1730 } 1731 1732 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1733 nfs4_stateid_copy(&state->stateid, stateid); 1734 nfs4_stateid_copy(&state->open_stateid, stateid); 1735 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1736 nfs_state_log_update_open_stateid(state); 1737 } 1738 1739 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1740 const nfs4_stateid *open_stateid, 1741 fmode_t fmode, 1742 nfs4_stateid *freeme) 1743 { 1744 /* 1745 * Protect the call to nfs4_state_set_mode_locked and 1746 * serialise the stateid update 1747 */ 1748 write_seqlock(&state->seqlock); 1749 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1750 switch (fmode) { 1751 case FMODE_READ: 1752 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1753 break; 1754 case FMODE_WRITE: 1755 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1756 break; 1757 case FMODE_READ|FMODE_WRITE: 1758 set_bit(NFS_O_RDWR_STATE, &state->flags); 1759 } 1760 set_bit(NFS_OPEN_STATE, &state->flags); 1761 write_sequnlock(&state->seqlock); 1762 } 1763 1764 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1765 { 1766 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1767 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1768 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1769 clear_bit(NFS_OPEN_STATE, &state->flags); 1770 } 1771 1772 static void nfs_state_set_delegation(struct nfs4_state *state, 1773 const nfs4_stateid *deleg_stateid, 1774 fmode_t fmode) 1775 { 1776 /* 1777 * Protect the call to nfs4_state_set_mode_locked and 1778 * serialise the stateid update 1779 */ 1780 write_seqlock(&state->seqlock); 1781 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1782 set_bit(NFS_DELEGATED_STATE, &state->flags); 1783 write_sequnlock(&state->seqlock); 1784 } 1785 1786 static void nfs_state_clear_delegation(struct nfs4_state *state) 1787 { 1788 write_seqlock(&state->seqlock); 1789 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1790 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1791 write_sequnlock(&state->seqlock); 1792 } 1793 1794 int update_open_stateid(struct nfs4_state *state, 1795 const nfs4_stateid *open_stateid, 1796 const nfs4_stateid *delegation, 1797 fmode_t fmode) 1798 { 1799 struct nfs_server *server = NFS_SERVER(state->inode); 1800 struct nfs_client *clp = server->nfs_client; 1801 struct nfs_inode *nfsi = NFS_I(state->inode); 1802 struct nfs_delegation *deleg_cur; 1803 nfs4_stateid freeme = { }; 1804 int ret = 0; 1805 1806 fmode &= (FMODE_READ|FMODE_WRITE); 1807 1808 rcu_read_lock(); 1809 spin_lock(&state->owner->so_lock); 1810 if (open_stateid != NULL) { 1811 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1812 ret = 1; 1813 } 1814 1815 deleg_cur = nfs4_get_valid_delegation(state->inode); 1816 if (deleg_cur == NULL) 1817 goto no_delegation; 1818 1819 spin_lock(&deleg_cur->lock); 1820 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1821 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1822 (deleg_cur->type & fmode) != fmode) 1823 goto no_delegation_unlock; 1824 1825 if (delegation == NULL) 1826 delegation = &deleg_cur->stateid; 1827 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1828 goto no_delegation_unlock; 1829 1830 nfs_mark_delegation_referenced(deleg_cur); 1831 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1832 ret = 1; 1833 no_delegation_unlock: 1834 spin_unlock(&deleg_cur->lock); 1835 no_delegation: 1836 if (ret) 1837 update_open_stateflags(state, fmode); 1838 spin_unlock(&state->owner->so_lock); 1839 rcu_read_unlock(); 1840 1841 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1842 nfs4_schedule_state_manager(clp); 1843 if (freeme.type != 0) 1844 nfs4_test_and_free_stateid(server, &freeme, 1845 state->owner->so_cred); 1846 1847 return ret; 1848 } 1849 1850 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1851 const nfs4_stateid *stateid) 1852 { 1853 struct nfs4_state *state = lsp->ls_state; 1854 bool ret = false; 1855 1856 spin_lock(&state->state_lock); 1857 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1858 goto out_noupdate; 1859 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1860 goto out_noupdate; 1861 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1862 ret = true; 1863 out_noupdate: 1864 spin_unlock(&state->state_lock); 1865 return ret; 1866 } 1867 1868 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1869 { 1870 struct nfs_delegation *delegation; 1871 1872 fmode &= FMODE_READ|FMODE_WRITE; 1873 rcu_read_lock(); 1874 delegation = nfs4_get_valid_delegation(inode); 1875 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1876 rcu_read_unlock(); 1877 return; 1878 } 1879 rcu_read_unlock(); 1880 nfs4_inode_return_delegation(inode); 1881 } 1882 1883 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1884 { 1885 struct nfs4_state *state = opendata->state; 1886 struct nfs_delegation *delegation; 1887 int open_mode = opendata->o_arg.open_flags; 1888 fmode_t fmode = opendata->o_arg.fmode; 1889 enum open_claim_type4 claim = opendata->o_arg.claim; 1890 nfs4_stateid stateid; 1891 int ret = -EAGAIN; 1892 1893 for (;;) { 1894 spin_lock(&state->owner->so_lock); 1895 if (can_open_cached(state, fmode, open_mode, claim)) { 1896 update_open_stateflags(state, fmode); 1897 spin_unlock(&state->owner->so_lock); 1898 goto out_return_state; 1899 } 1900 spin_unlock(&state->owner->so_lock); 1901 rcu_read_lock(); 1902 delegation = nfs4_get_valid_delegation(state->inode); 1903 if (!can_open_delegated(delegation, fmode, claim)) { 1904 rcu_read_unlock(); 1905 break; 1906 } 1907 /* Save the delegation */ 1908 nfs4_stateid_copy(&stateid, &delegation->stateid); 1909 rcu_read_unlock(); 1910 nfs_release_seqid(opendata->o_arg.seqid); 1911 if (!opendata->is_recover) { 1912 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1913 if (ret != 0) 1914 goto out; 1915 } 1916 ret = -EAGAIN; 1917 1918 /* Try to update the stateid using the delegation */ 1919 if (update_open_stateid(state, NULL, &stateid, fmode)) 1920 goto out_return_state; 1921 } 1922 out: 1923 return ERR_PTR(ret); 1924 out_return_state: 1925 refcount_inc(&state->count); 1926 return state; 1927 } 1928 1929 static void 1930 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1931 { 1932 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1933 struct nfs_delegation *delegation; 1934 int delegation_flags = 0; 1935 1936 rcu_read_lock(); 1937 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1938 if (delegation) 1939 delegation_flags = delegation->flags; 1940 rcu_read_unlock(); 1941 switch (data->o_arg.claim) { 1942 default: 1943 break; 1944 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1945 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1946 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1947 "returning a delegation for " 1948 "OPEN(CLAIM_DELEGATE_CUR)\n", 1949 clp->cl_hostname); 1950 return; 1951 } 1952 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1953 nfs_inode_set_delegation(state->inode, 1954 data->owner->so_cred, 1955 data->o_res.delegation_type, 1956 &data->o_res.delegation, 1957 data->o_res.pagemod_limit); 1958 else 1959 nfs_inode_reclaim_delegation(state->inode, 1960 data->owner->so_cred, 1961 data->o_res.delegation_type, 1962 &data->o_res.delegation, 1963 data->o_res.pagemod_limit); 1964 1965 if (data->o_res.do_recall) 1966 nfs_async_inode_return_delegation(state->inode, 1967 &data->o_res.delegation); 1968 } 1969 1970 /* 1971 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1972 * and update the nfs4_state. 1973 */ 1974 static struct nfs4_state * 1975 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1976 { 1977 struct inode *inode = data->state->inode; 1978 struct nfs4_state *state = data->state; 1979 int ret; 1980 1981 if (!data->rpc_done) { 1982 if (data->rpc_status) 1983 return ERR_PTR(data->rpc_status); 1984 return nfs4_try_open_cached(data); 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 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 struct nfs_fh *fh = &o_res->fh; 2707 2708 nfs4_sequence_free_slot(&o_res->seq_res); 2709 if (o_arg->claim == NFS4_OPEN_CLAIM_FH) 2710 fh = NFS_FH(d_inode(data->dentry)); 2711 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL); 2712 } 2713 return 0; 2714 } 2715 2716 /* 2717 * OPEN_EXPIRED: 2718 * reclaim state on the server after a network partition. 2719 * Assumes caller holds the appropriate lock 2720 */ 2721 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2722 { 2723 struct nfs4_opendata *opendata; 2724 int ret; 2725 2726 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2727 if (IS_ERR(opendata)) 2728 return PTR_ERR(opendata); 2729 /* 2730 * We're not recovering a delegation, so ask for no delegation. 2731 * Otherwise the recovery thread could deadlock with an outstanding 2732 * delegation return. 2733 */ 2734 opendata->o_arg.open_flags = O_DIRECT; 2735 ret = nfs4_open_recover(opendata, state); 2736 if (ret == -ESTALE) 2737 d_drop(ctx->dentry); 2738 nfs4_opendata_put(opendata); 2739 return ret; 2740 } 2741 2742 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2743 { 2744 struct nfs_server *server = NFS_SERVER(state->inode); 2745 struct nfs4_exception exception = { }; 2746 int err; 2747 2748 do { 2749 err = _nfs4_open_expired(ctx, state); 2750 trace_nfs4_open_expired(ctx, 0, err); 2751 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2752 continue; 2753 switch (err) { 2754 default: 2755 goto out; 2756 case -NFS4ERR_GRACE: 2757 case -NFS4ERR_DELAY: 2758 nfs4_handle_exception(server, err, &exception); 2759 err = 0; 2760 } 2761 } while (exception.retry); 2762 out: 2763 return err; 2764 } 2765 2766 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2767 { 2768 struct nfs_open_context *ctx; 2769 int ret; 2770 2771 ctx = nfs4_state_find_open_context(state); 2772 if (IS_ERR(ctx)) 2773 return -EAGAIN; 2774 ret = nfs4_do_open_expired(ctx, state); 2775 put_nfs_open_context(ctx); 2776 return ret; 2777 } 2778 2779 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2780 const nfs4_stateid *stateid) 2781 { 2782 nfs_remove_bad_delegation(state->inode, stateid); 2783 nfs_state_clear_delegation(state); 2784 } 2785 2786 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2787 { 2788 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2789 nfs_finish_clear_delegation_stateid(state, NULL); 2790 } 2791 2792 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2793 { 2794 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2795 nfs40_clear_delegation_stateid(state); 2796 nfs_state_clear_open_state_flags(state); 2797 return nfs4_open_expired(sp, state); 2798 } 2799 2800 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2801 nfs4_stateid *stateid, 2802 const struct cred *cred) 2803 { 2804 return -NFS4ERR_BAD_STATEID; 2805 } 2806 2807 #if defined(CONFIG_NFS_V4_1) 2808 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2809 nfs4_stateid *stateid, 2810 const struct cred *cred) 2811 { 2812 int status; 2813 2814 switch (stateid->type) { 2815 default: 2816 break; 2817 case NFS4_INVALID_STATEID_TYPE: 2818 case NFS4_SPECIAL_STATEID_TYPE: 2819 return -NFS4ERR_BAD_STATEID; 2820 case NFS4_REVOKED_STATEID_TYPE: 2821 goto out_free; 2822 } 2823 2824 status = nfs41_test_stateid(server, stateid, cred); 2825 switch (status) { 2826 case -NFS4ERR_EXPIRED: 2827 case -NFS4ERR_ADMIN_REVOKED: 2828 case -NFS4ERR_DELEG_REVOKED: 2829 break; 2830 default: 2831 return status; 2832 } 2833 out_free: 2834 /* Ack the revoked state to the server */ 2835 nfs41_free_stateid(server, stateid, cred, true); 2836 return -NFS4ERR_EXPIRED; 2837 } 2838 2839 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2840 { 2841 struct nfs_server *server = NFS_SERVER(state->inode); 2842 nfs4_stateid stateid; 2843 struct nfs_delegation *delegation; 2844 const struct cred *cred = NULL; 2845 int status, ret = NFS_OK; 2846 2847 /* Get the delegation credential for use by test/free_stateid */ 2848 rcu_read_lock(); 2849 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2850 if (delegation == NULL) { 2851 rcu_read_unlock(); 2852 nfs_state_clear_delegation(state); 2853 return NFS_OK; 2854 } 2855 2856 spin_lock(&delegation->lock); 2857 nfs4_stateid_copy(&stateid, &delegation->stateid); 2858 2859 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2860 &delegation->flags)) { 2861 spin_unlock(&delegation->lock); 2862 rcu_read_unlock(); 2863 return NFS_OK; 2864 } 2865 2866 if (delegation->cred) 2867 cred = get_cred(delegation->cred); 2868 spin_unlock(&delegation->lock); 2869 rcu_read_unlock(); 2870 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2871 trace_nfs4_test_delegation_stateid(state, NULL, status); 2872 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2873 nfs_finish_clear_delegation_stateid(state, &stateid); 2874 else 2875 ret = status; 2876 2877 put_cred(cred); 2878 return ret; 2879 } 2880 2881 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2882 { 2883 nfs4_stateid tmp; 2884 2885 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2886 nfs4_copy_delegation_stateid(state->inode, state->state, 2887 &tmp, NULL) && 2888 nfs4_stateid_match_other(&state->stateid, &tmp)) 2889 nfs_state_set_delegation(state, &tmp, state->state); 2890 else 2891 nfs_state_clear_delegation(state); 2892 } 2893 2894 /** 2895 * nfs41_check_expired_locks - possibly free a lock stateid 2896 * 2897 * @state: NFSv4 state for an inode 2898 * 2899 * Returns NFS_OK if recovery for this stateid is now finished. 2900 * Otherwise a negative NFS4ERR value is returned. 2901 */ 2902 static int nfs41_check_expired_locks(struct nfs4_state *state) 2903 { 2904 int status, ret = NFS_OK; 2905 struct nfs4_lock_state *lsp, *prev = NULL; 2906 struct nfs_server *server = NFS_SERVER(state->inode); 2907 2908 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2909 goto out; 2910 2911 spin_lock(&state->state_lock); 2912 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2913 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2914 const struct cred *cred = lsp->ls_state->owner->so_cred; 2915 2916 refcount_inc(&lsp->ls_count); 2917 spin_unlock(&state->state_lock); 2918 2919 nfs4_put_lock_state(prev); 2920 prev = lsp; 2921 2922 status = nfs41_test_and_free_expired_stateid(server, 2923 &lsp->ls_stateid, 2924 cred); 2925 trace_nfs4_test_lock_stateid(state, lsp, status); 2926 if (status == -NFS4ERR_EXPIRED || 2927 status == -NFS4ERR_BAD_STATEID) { 2928 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2929 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2930 if (!recover_lost_locks) 2931 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2932 } else if (status != NFS_OK) { 2933 ret = status; 2934 nfs4_put_lock_state(prev); 2935 goto out; 2936 } 2937 spin_lock(&state->state_lock); 2938 } 2939 } 2940 spin_unlock(&state->state_lock); 2941 nfs4_put_lock_state(prev); 2942 out: 2943 return ret; 2944 } 2945 2946 /** 2947 * nfs41_check_open_stateid - possibly free an open stateid 2948 * 2949 * @state: NFSv4 state for an inode 2950 * 2951 * Returns NFS_OK if recovery for this stateid is now finished. 2952 * Otherwise a negative NFS4ERR value is returned. 2953 */ 2954 static int nfs41_check_open_stateid(struct nfs4_state *state) 2955 { 2956 struct nfs_server *server = NFS_SERVER(state->inode); 2957 nfs4_stateid *stateid = &state->open_stateid; 2958 const struct cred *cred = state->owner->so_cred; 2959 int status; 2960 2961 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2962 return -NFS4ERR_BAD_STATEID; 2963 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2964 trace_nfs4_test_open_stateid(state, NULL, status); 2965 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2966 nfs_state_clear_open_state_flags(state); 2967 stateid->type = NFS4_INVALID_STATEID_TYPE; 2968 return status; 2969 } 2970 if (nfs_open_stateid_recover_openmode(state)) 2971 return -NFS4ERR_OPENMODE; 2972 return NFS_OK; 2973 } 2974 2975 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2976 { 2977 int status; 2978 2979 status = nfs41_check_delegation_stateid(state); 2980 if (status != NFS_OK) 2981 return status; 2982 nfs41_delegation_recover_stateid(state); 2983 2984 status = nfs41_check_expired_locks(state); 2985 if (status != NFS_OK) 2986 return status; 2987 status = nfs41_check_open_stateid(state); 2988 if (status != NFS_OK) 2989 status = nfs4_open_expired(sp, state); 2990 return status; 2991 } 2992 #endif 2993 2994 /* 2995 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2996 * fields corresponding to attributes that were used to store the verifier. 2997 * Make sure we clobber those fields in the later setattr call 2998 */ 2999 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 3000 struct iattr *sattr, struct nfs4_label **label) 3001 { 3002 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 3003 __u32 attrset[3]; 3004 unsigned ret; 3005 unsigned i; 3006 3007 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3008 attrset[i] = opendata->o_res.attrset[i]; 3009 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3010 attrset[i] &= ~bitmask[i]; 3011 } 3012 3013 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3014 sattr->ia_valid : 0; 3015 3016 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3017 if (sattr->ia_valid & ATTR_ATIME_SET) 3018 ret |= ATTR_ATIME_SET; 3019 else 3020 ret |= ATTR_ATIME; 3021 } 3022 3023 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3024 if (sattr->ia_valid & ATTR_MTIME_SET) 3025 ret |= ATTR_MTIME_SET; 3026 else 3027 ret |= ATTR_MTIME; 3028 } 3029 3030 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3031 *label = NULL; 3032 return ret; 3033 } 3034 3035 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3036 struct nfs_open_context *ctx) 3037 { 3038 struct nfs4_state_owner *sp = opendata->owner; 3039 struct nfs_server *server = sp->so_server; 3040 struct dentry *dentry; 3041 struct nfs4_state *state; 3042 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3043 struct inode *dir = d_inode(opendata->dir); 3044 unsigned long dir_verifier; 3045 unsigned int seq; 3046 int ret; 3047 3048 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3049 dir_verifier = nfs_save_change_attribute(dir); 3050 3051 ret = _nfs4_proc_open(opendata, ctx); 3052 if (ret != 0) 3053 goto out; 3054 3055 state = _nfs4_opendata_to_nfs4_state(opendata); 3056 ret = PTR_ERR(state); 3057 if (IS_ERR(state)) 3058 goto out; 3059 ctx->state = state; 3060 if (server->caps & NFS_CAP_POSIX_LOCK) 3061 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3062 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3063 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3064 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3065 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3066 3067 dentry = opendata->dentry; 3068 if (d_really_is_negative(dentry)) { 3069 struct dentry *alias; 3070 d_drop(dentry); 3071 alias = d_exact_alias(dentry, state->inode); 3072 if (!alias) 3073 alias = d_splice_alias(igrab(state->inode), dentry); 3074 /* d_splice_alias() can't fail here - it's a non-directory */ 3075 if (alias) { 3076 dput(ctx->dentry); 3077 ctx->dentry = dentry = alias; 3078 } 3079 } 3080 3081 switch(opendata->o_arg.claim) { 3082 default: 3083 break; 3084 case NFS4_OPEN_CLAIM_NULL: 3085 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3086 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3087 if (!opendata->rpc_done) 3088 break; 3089 if (opendata->o_res.delegation_type != 0) 3090 dir_verifier = nfs_save_change_attribute(dir); 3091 nfs_set_verifier(dentry, dir_verifier); 3092 } 3093 3094 /* Parse layoutget results before we check for access */ 3095 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3096 3097 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3098 if (ret != 0) 3099 goto out; 3100 3101 if (d_inode(dentry) == state->inode) { 3102 nfs_inode_attach_open_context(ctx); 3103 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3104 nfs4_schedule_stateid_recovery(server, state); 3105 } 3106 3107 out: 3108 if (!opendata->cancelled) { 3109 if (opendata->lgp) { 3110 nfs4_lgopen_release(opendata->lgp); 3111 opendata->lgp = NULL; 3112 } 3113 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3114 } 3115 return ret; 3116 } 3117 3118 /* 3119 * Returns a referenced nfs4_state 3120 */ 3121 static int _nfs4_do_open(struct inode *dir, 3122 struct nfs_open_context *ctx, 3123 int flags, 3124 const struct nfs4_open_createattrs *c, 3125 int *opened) 3126 { 3127 struct nfs4_state_owner *sp; 3128 struct nfs4_state *state = NULL; 3129 struct nfs_server *server = NFS_SERVER(dir); 3130 struct nfs4_opendata *opendata; 3131 struct dentry *dentry = ctx->dentry; 3132 const struct cred *cred = ctx->cred; 3133 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3134 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3135 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3136 struct iattr *sattr = c->sattr; 3137 struct nfs4_label *label = c->label; 3138 int status; 3139 3140 /* Protect against reboot recovery conflicts */ 3141 status = -ENOMEM; 3142 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3143 if (sp == NULL) { 3144 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3145 goto out_err; 3146 } 3147 status = nfs4_client_recover_expired_lease(server->nfs_client); 3148 if (status != 0) 3149 goto err_put_state_owner; 3150 if (d_really_is_positive(dentry)) 3151 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3152 status = -ENOMEM; 3153 if (d_really_is_positive(dentry)) 3154 claim = NFS4_OPEN_CLAIM_FH; 3155 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3156 c, claim, GFP_KERNEL); 3157 if (opendata == NULL) 3158 goto err_put_state_owner; 3159 3160 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3161 if (!opendata->f_attr.mdsthreshold) { 3162 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3163 if (!opendata->f_attr.mdsthreshold) 3164 goto err_opendata_put; 3165 } 3166 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3167 } 3168 if (d_really_is_positive(dentry)) 3169 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3170 3171 status = _nfs4_open_and_get_state(opendata, ctx); 3172 if (status != 0) 3173 goto err_opendata_put; 3174 state = ctx->state; 3175 3176 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3177 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3178 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3179 /* 3180 * send create attributes which was not set by open 3181 * with an extra setattr. 3182 */ 3183 if (attrs || label) { 3184 unsigned ia_old = sattr->ia_valid; 3185 3186 sattr->ia_valid = attrs; 3187 nfs_fattr_init(opendata->o_res.f_attr); 3188 status = nfs4_do_setattr(state->inode, cred, 3189 opendata->o_res.f_attr, sattr, 3190 ctx, label); 3191 if (status == 0) { 3192 nfs_setattr_update_inode(state->inode, sattr, 3193 opendata->o_res.f_attr); 3194 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3195 } 3196 sattr->ia_valid = ia_old; 3197 } 3198 } 3199 if (opened && opendata->file_created) 3200 *opened = 1; 3201 3202 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3203 *ctx_th = opendata->f_attr.mdsthreshold; 3204 opendata->f_attr.mdsthreshold = NULL; 3205 } 3206 3207 nfs4_opendata_put(opendata); 3208 nfs4_put_state_owner(sp); 3209 return 0; 3210 err_opendata_put: 3211 nfs4_opendata_put(opendata); 3212 err_put_state_owner: 3213 nfs4_put_state_owner(sp); 3214 out_err: 3215 return status; 3216 } 3217 3218 3219 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3220 struct nfs_open_context *ctx, 3221 int flags, 3222 struct iattr *sattr, 3223 struct nfs4_label *label, 3224 int *opened) 3225 { 3226 struct nfs_server *server = NFS_SERVER(dir); 3227 struct nfs4_exception exception = { 3228 .interruptible = true, 3229 }; 3230 struct nfs4_state *res; 3231 struct nfs4_open_createattrs c = { 3232 .label = label, 3233 .sattr = sattr, 3234 .verf = { 3235 [0] = (__u32)jiffies, 3236 [1] = (__u32)current->pid, 3237 }, 3238 }; 3239 int status; 3240 3241 do { 3242 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3243 res = ctx->state; 3244 trace_nfs4_open_file(ctx, flags, status); 3245 if (status == 0) 3246 break; 3247 /* NOTE: BAD_SEQID means the server and client disagree about the 3248 * book-keeping w.r.t. state-changing operations 3249 * (OPEN/CLOSE/LOCK/LOCKU...) 3250 * It is actually a sign of a bug on the client or on the server. 3251 * 3252 * If we receive a BAD_SEQID error in the particular case of 3253 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3254 * have unhashed the old state_owner for us, and that we can 3255 * therefore safely retry using a new one. We should still warn 3256 * the user though... 3257 */ 3258 if (status == -NFS4ERR_BAD_SEQID) { 3259 pr_warn_ratelimited("NFS: v4 server %s " 3260 " returned a bad sequence-id error!\n", 3261 NFS_SERVER(dir)->nfs_client->cl_hostname); 3262 exception.retry = 1; 3263 continue; 3264 } 3265 /* 3266 * BAD_STATEID on OPEN means that the server cancelled our 3267 * state before it received the OPEN_CONFIRM. 3268 * Recover by retrying the request as per the discussion 3269 * on Page 181 of RFC3530. 3270 */ 3271 if (status == -NFS4ERR_BAD_STATEID) { 3272 exception.retry = 1; 3273 continue; 3274 } 3275 if (status == -NFS4ERR_EXPIRED) { 3276 nfs4_schedule_lease_recovery(server->nfs_client); 3277 exception.retry = 1; 3278 continue; 3279 } 3280 if (status == -EAGAIN) { 3281 /* We must have found a delegation */ 3282 exception.retry = 1; 3283 continue; 3284 } 3285 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3286 continue; 3287 res = ERR_PTR(nfs4_handle_exception(server, 3288 status, &exception)); 3289 } while (exception.retry); 3290 return res; 3291 } 3292 3293 static int _nfs4_do_setattr(struct inode *inode, 3294 struct nfs_setattrargs *arg, 3295 struct nfs_setattrres *res, 3296 const struct cred *cred, 3297 struct nfs_open_context *ctx) 3298 { 3299 struct nfs_server *server = NFS_SERVER(inode); 3300 struct rpc_message msg = { 3301 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3302 .rpc_argp = arg, 3303 .rpc_resp = res, 3304 .rpc_cred = cred, 3305 }; 3306 const struct cred *delegation_cred = NULL; 3307 unsigned long timestamp = jiffies; 3308 bool truncate; 3309 int status; 3310 3311 nfs_fattr_init(res->fattr); 3312 3313 /* Servers should only apply open mode checks for file size changes */ 3314 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3315 if (!truncate) { 3316 nfs4_inode_make_writeable(inode); 3317 goto zero_stateid; 3318 } 3319 3320 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3321 /* Use that stateid */ 3322 } else if (ctx != NULL && ctx->state) { 3323 struct nfs_lock_context *l_ctx; 3324 if (!nfs4_valid_open_stateid(ctx->state)) 3325 return -EBADF; 3326 l_ctx = nfs_get_lock_context(ctx); 3327 if (IS_ERR(l_ctx)) 3328 return PTR_ERR(l_ctx); 3329 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3330 &arg->stateid, &delegation_cred); 3331 nfs_put_lock_context(l_ctx); 3332 if (status == -EIO) 3333 return -EBADF; 3334 else if (status == -EAGAIN) 3335 goto zero_stateid; 3336 } else { 3337 zero_stateid: 3338 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3339 } 3340 if (delegation_cred) 3341 msg.rpc_cred = delegation_cred; 3342 3343 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3344 3345 put_cred(delegation_cred); 3346 if (status == 0 && ctx != NULL) 3347 renew_lease(server, timestamp); 3348 trace_nfs4_setattr(inode, &arg->stateid, status); 3349 return status; 3350 } 3351 3352 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3353 struct nfs_fattr *fattr, struct iattr *sattr, 3354 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3355 { 3356 struct nfs_server *server = NFS_SERVER(inode); 3357 __u32 bitmask[NFS4_BITMASK_SZ]; 3358 struct nfs4_state *state = ctx ? ctx->state : NULL; 3359 struct nfs_setattrargs arg = { 3360 .fh = NFS_FH(inode), 3361 .iap = sattr, 3362 .server = server, 3363 .bitmask = bitmask, 3364 .label = ilabel, 3365 }; 3366 struct nfs_setattrres res = { 3367 .fattr = fattr, 3368 .server = server, 3369 }; 3370 struct nfs4_exception exception = { 3371 .state = state, 3372 .inode = inode, 3373 .stateid = &arg.stateid, 3374 }; 3375 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3376 int err; 3377 3378 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3379 adjust_flags |= NFS_INO_INVALID_MODE; 3380 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3381 adjust_flags |= NFS_INO_INVALID_OTHER; 3382 3383 do { 3384 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3385 inode, adjust_flags); 3386 3387 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3388 switch (err) { 3389 case -NFS4ERR_OPENMODE: 3390 if (!(sattr->ia_valid & ATTR_SIZE)) { 3391 pr_warn_once("NFSv4: server %s is incorrectly " 3392 "applying open mode checks to " 3393 "a SETATTR that is not " 3394 "changing file size.\n", 3395 server->nfs_client->cl_hostname); 3396 } 3397 if (state && !(state->state & FMODE_WRITE)) { 3398 err = -EBADF; 3399 if (sattr->ia_valid & ATTR_OPEN) 3400 err = -EACCES; 3401 goto out; 3402 } 3403 } 3404 err = nfs4_handle_exception(server, err, &exception); 3405 } while (exception.retry); 3406 out: 3407 return err; 3408 } 3409 3410 static bool 3411 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3412 { 3413 if (inode == NULL || !nfs_have_layout(inode)) 3414 return false; 3415 3416 return pnfs_wait_on_layoutreturn(inode, task); 3417 } 3418 3419 /* 3420 * Update the seqid of an open stateid 3421 */ 3422 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3423 struct nfs4_state *state) 3424 { 3425 __be32 seqid_open; 3426 u32 dst_seqid; 3427 int seq; 3428 3429 for (;;) { 3430 if (!nfs4_valid_open_stateid(state)) 3431 break; 3432 seq = read_seqbegin(&state->seqlock); 3433 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3434 nfs4_stateid_copy(dst, &state->open_stateid); 3435 if (read_seqretry(&state->seqlock, seq)) 3436 continue; 3437 break; 3438 } 3439 seqid_open = state->open_stateid.seqid; 3440 if (read_seqretry(&state->seqlock, seq)) 3441 continue; 3442 3443 dst_seqid = be32_to_cpu(dst->seqid); 3444 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3445 dst->seqid = seqid_open; 3446 break; 3447 } 3448 } 3449 3450 /* 3451 * Update the seqid of an open stateid after receiving 3452 * NFS4ERR_OLD_STATEID 3453 */ 3454 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3455 struct nfs4_state *state) 3456 { 3457 __be32 seqid_open; 3458 u32 dst_seqid; 3459 bool ret; 3460 int seq, status = -EAGAIN; 3461 DEFINE_WAIT(wait); 3462 3463 for (;;) { 3464 ret = false; 3465 if (!nfs4_valid_open_stateid(state)) 3466 break; 3467 seq = read_seqbegin(&state->seqlock); 3468 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3469 if (read_seqretry(&state->seqlock, seq)) 3470 continue; 3471 break; 3472 } 3473 3474 write_seqlock(&state->seqlock); 3475 seqid_open = state->open_stateid.seqid; 3476 3477 dst_seqid = be32_to_cpu(dst->seqid); 3478 3479 /* Did another OPEN bump the state's seqid? try again: */ 3480 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3481 dst->seqid = seqid_open; 3482 write_sequnlock(&state->seqlock); 3483 ret = true; 3484 break; 3485 } 3486 3487 /* server says we're behind but we haven't seen the update yet */ 3488 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3489 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3490 write_sequnlock(&state->seqlock); 3491 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3492 3493 if (fatal_signal_pending(current)) 3494 status = -EINTR; 3495 else 3496 if (schedule_timeout(5*HZ) != 0) 3497 status = 0; 3498 3499 finish_wait(&state->waitq, &wait); 3500 3501 if (!status) 3502 continue; 3503 if (status == -EINTR) 3504 break; 3505 3506 /* we slept the whole 5 seconds, we must have lost a seqid */ 3507 dst->seqid = cpu_to_be32(dst_seqid + 1); 3508 ret = true; 3509 break; 3510 } 3511 3512 return ret; 3513 } 3514 3515 struct nfs4_closedata { 3516 struct inode *inode; 3517 struct nfs4_state *state; 3518 struct nfs_closeargs arg; 3519 struct nfs_closeres res; 3520 struct { 3521 struct nfs4_layoutreturn_args arg; 3522 struct nfs4_layoutreturn_res res; 3523 struct nfs4_xdr_opaque_data ld_private; 3524 u32 roc_barrier; 3525 bool roc; 3526 } lr; 3527 struct nfs_fattr fattr; 3528 unsigned long timestamp; 3529 }; 3530 3531 static void nfs4_free_closedata(void *data) 3532 { 3533 struct nfs4_closedata *calldata = data; 3534 struct nfs4_state_owner *sp = calldata->state->owner; 3535 struct super_block *sb = calldata->state->inode->i_sb; 3536 3537 if (calldata->lr.roc) 3538 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3539 calldata->res.lr_ret); 3540 nfs4_put_open_state(calldata->state); 3541 nfs_free_seqid(calldata->arg.seqid); 3542 nfs4_put_state_owner(sp); 3543 nfs_sb_deactive(sb); 3544 kfree(calldata); 3545 } 3546 3547 static void nfs4_close_done(struct rpc_task *task, void *data) 3548 { 3549 struct nfs4_closedata *calldata = data; 3550 struct nfs4_state *state = calldata->state; 3551 struct nfs_server *server = NFS_SERVER(calldata->inode); 3552 nfs4_stateid *res_stateid = NULL; 3553 struct nfs4_exception exception = { 3554 .state = state, 3555 .inode = calldata->inode, 3556 .stateid = &calldata->arg.stateid, 3557 }; 3558 3559 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3560 return; 3561 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3562 3563 /* Handle Layoutreturn errors */ 3564 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3565 &calldata->res.lr_ret) == -EAGAIN) 3566 goto out_restart; 3567 3568 /* hmm. we are done with the inode, and in the process of freeing 3569 * the state_owner. we keep this around to process errors 3570 */ 3571 switch (task->tk_status) { 3572 case 0: 3573 res_stateid = &calldata->res.stateid; 3574 renew_lease(server, calldata->timestamp); 3575 break; 3576 case -NFS4ERR_ACCESS: 3577 if (calldata->arg.bitmask != NULL) { 3578 calldata->arg.bitmask = NULL; 3579 calldata->res.fattr = NULL; 3580 goto out_restart; 3581 3582 } 3583 break; 3584 case -NFS4ERR_OLD_STATEID: 3585 /* Did we race with OPEN? */ 3586 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3587 state)) 3588 goto out_restart; 3589 goto out_release; 3590 case -NFS4ERR_ADMIN_REVOKED: 3591 case -NFS4ERR_STALE_STATEID: 3592 case -NFS4ERR_EXPIRED: 3593 nfs4_free_revoked_stateid(server, 3594 &calldata->arg.stateid, 3595 task->tk_msg.rpc_cred); 3596 fallthrough; 3597 case -NFS4ERR_BAD_STATEID: 3598 if (calldata->arg.fmode == 0) 3599 break; 3600 fallthrough; 3601 default: 3602 task->tk_status = nfs4_async_handle_exception(task, 3603 server, task->tk_status, &exception); 3604 if (exception.retry) 3605 goto out_restart; 3606 } 3607 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3608 res_stateid, calldata->arg.fmode); 3609 out_release: 3610 task->tk_status = 0; 3611 nfs_release_seqid(calldata->arg.seqid); 3612 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3613 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3614 return; 3615 out_restart: 3616 task->tk_status = 0; 3617 rpc_restart_call_prepare(task); 3618 goto out_release; 3619 } 3620 3621 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3622 { 3623 struct nfs4_closedata *calldata = data; 3624 struct nfs4_state *state = calldata->state; 3625 struct inode *inode = calldata->inode; 3626 struct nfs_server *server = NFS_SERVER(inode); 3627 struct pnfs_layout_hdr *lo; 3628 bool is_rdonly, is_wronly, is_rdwr; 3629 int call_close = 0; 3630 3631 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3632 goto out_wait; 3633 3634 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3635 spin_lock(&state->owner->so_lock); 3636 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3637 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3638 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3639 /* Calculate the change in open mode */ 3640 calldata->arg.fmode = 0; 3641 if (state->n_rdwr == 0) { 3642 if (state->n_rdonly == 0) 3643 call_close |= is_rdonly; 3644 else if (is_rdonly) 3645 calldata->arg.fmode |= FMODE_READ; 3646 if (state->n_wronly == 0) 3647 call_close |= is_wronly; 3648 else if (is_wronly) 3649 calldata->arg.fmode |= FMODE_WRITE; 3650 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3651 call_close |= is_rdwr; 3652 } else if (is_rdwr) 3653 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3654 3655 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3656 if (!nfs4_valid_open_stateid(state)) 3657 call_close = 0; 3658 spin_unlock(&state->owner->so_lock); 3659 3660 if (!call_close) { 3661 /* Note: exit _without_ calling nfs4_close_done */ 3662 goto out_no_action; 3663 } 3664 3665 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3666 nfs_release_seqid(calldata->arg.seqid); 3667 goto out_wait; 3668 } 3669 3670 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3671 if (lo && !pnfs_layout_is_valid(lo)) { 3672 calldata->arg.lr_args = NULL; 3673 calldata->res.lr_res = NULL; 3674 } 3675 3676 if (calldata->arg.fmode == 0) 3677 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3678 3679 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3680 /* Close-to-open cache consistency revalidation */ 3681 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3682 nfs4_bitmask_set(calldata->arg.bitmask_store, 3683 server->cache_consistency_bitmask, 3684 inode, 0); 3685 calldata->arg.bitmask = calldata->arg.bitmask_store; 3686 } else 3687 calldata->arg.bitmask = NULL; 3688 } 3689 3690 calldata->arg.share_access = 3691 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3692 calldata->arg.fmode, 0); 3693 3694 if (calldata->res.fattr == NULL) 3695 calldata->arg.bitmask = NULL; 3696 else if (calldata->arg.bitmask == NULL) 3697 calldata->res.fattr = NULL; 3698 calldata->timestamp = jiffies; 3699 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3700 &calldata->arg.seq_args, 3701 &calldata->res.seq_res, 3702 task) != 0) 3703 nfs_release_seqid(calldata->arg.seqid); 3704 return; 3705 out_no_action: 3706 task->tk_action = NULL; 3707 out_wait: 3708 nfs4_sequence_done(task, &calldata->res.seq_res); 3709 } 3710 3711 static const struct rpc_call_ops nfs4_close_ops = { 3712 .rpc_call_prepare = nfs4_close_prepare, 3713 .rpc_call_done = nfs4_close_done, 3714 .rpc_release = nfs4_free_closedata, 3715 }; 3716 3717 /* 3718 * It is possible for data to be read/written from a mem-mapped file 3719 * after the sys_close call (which hits the vfs layer as a flush). 3720 * This means that we can't safely call nfsv4 close on a file until 3721 * the inode is cleared. This in turn means that we are not good 3722 * NFSv4 citizens - we do not indicate to the server to update the file's 3723 * share state even when we are done with one of the three share 3724 * stateid's in the inode. 3725 * 3726 * NOTE: Caller must be holding the sp->so_owner semaphore! 3727 */ 3728 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3729 { 3730 struct nfs_server *server = NFS_SERVER(state->inode); 3731 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3732 struct nfs4_closedata *calldata; 3733 struct nfs4_state_owner *sp = state->owner; 3734 struct rpc_task *task; 3735 struct rpc_message msg = { 3736 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3737 .rpc_cred = state->owner->so_cred, 3738 }; 3739 struct rpc_task_setup task_setup_data = { 3740 .rpc_client = server->client, 3741 .rpc_message = &msg, 3742 .callback_ops = &nfs4_close_ops, 3743 .workqueue = nfsiod_workqueue, 3744 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3745 }; 3746 int status = -ENOMEM; 3747 3748 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3749 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3750 3751 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3752 &task_setup_data.rpc_client, &msg); 3753 3754 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3755 if (calldata == NULL) 3756 goto out; 3757 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3758 calldata->inode = state->inode; 3759 calldata->state = state; 3760 calldata->arg.fh = NFS_FH(state->inode); 3761 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3762 goto out_free_calldata; 3763 /* Serialization for the sequence id */ 3764 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3765 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3766 if (IS_ERR(calldata->arg.seqid)) 3767 goto out_free_calldata; 3768 nfs_fattr_init(&calldata->fattr); 3769 calldata->arg.fmode = 0; 3770 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3771 calldata->res.fattr = &calldata->fattr; 3772 calldata->res.seqid = calldata->arg.seqid; 3773 calldata->res.server = server; 3774 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3775 calldata->lr.roc = pnfs_roc(state->inode, 3776 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3777 if (calldata->lr.roc) { 3778 calldata->arg.lr_args = &calldata->lr.arg; 3779 calldata->res.lr_res = &calldata->lr.res; 3780 } 3781 nfs_sb_active(calldata->inode->i_sb); 3782 3783 msg.rpc_argp = &calldata->arg; 3784 msg.rpc_resp = &calldata->res; 3785 task_setup_data.callback_data = calldata; 3786 task = rpc_run_task(&task_setup_data); 3787 if (IS_ERR(task)) 3788 return PTR_ERR(task); 3789 status = 0; 3790 if (wait) 3791 status = rpc_wait_for_completion_task(task); 3792 rpc_put_task(task); 3793 return status; 3794 out_free_calldata: 3795 kfree(calldata); 3796 out: 3797 nfs4_put_open_state(state); 3798 nfs4_put_state_owner(sp); 3799 return status; 3800 } 3801 3802 static struct inode * 3803 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3804 int open_flags, struct iattr *attr, int *opened) 3805 { 3806 struct nfs4_state *state; 3807 struct nfs4_label l, *label; 3808 3809 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3810 3811 /* Protect against concurrent sillydeletes */ 3812 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3813 3814 nfs4_label_release_security(label); 3815 3816 if (IS_ERR(state)) 3817 return ERR_CAST(state); 3818 return state->inode; 3819 } 3820 3821 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3822 { 3823 if (ctx->state == NULL) 3824 return; 3825 if (is_sync) 3826 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3827 else 3828 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3829 } 3830 3831 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3832 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3833 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3834 3835 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3836 { 3837 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3838 struct nfs4_server_caps_arg args = { 3839 .fhandle = fhandle, 3840 .bitmask = bitmask, 3841 }; 3842 struct nfs4_server_caps_res res = {}; 3843 struct rpc_message msg = { 3844 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3845 .rpc_argp = &args, 3846 .rpc_resp = &res, 3847 }; 3848 int status; 3849 int i; 3850 3851 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3852 FATTR4_WORD0_FH_EXPIRE_TYPE | 3853 FATTR4_WORD0_LINK_SUPPORT | 3854 FATTR4_WORD0_SYMLINK_SUPPORT | 3855 FATTR4_WORD0_ACLSUPPORT | 3856 FATTR4_WORD0_CASE_INSENSITIVE | 3857 FATTR4_WORD0_CASE_PRESERVING; 3858 if (minorversion) 3859 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3860 3861 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3862 if (status == 0) { 3863 /* Sanity check the server answers */ 3864 switch (minorversion) { 3865 case 0: 3866 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3867 res.attr_bitmask[2] = 0; 3868 break; 3869 case 1: 3870 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3871 break; 3872 case 2: 3873 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3874 } 3875 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3876 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3877 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3878 server->fattr_valid = NFS_ATTR_FATTR_V4; 3879 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3880 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3881 server->caps |= NFS_CAP_ACLS; 3882 if (res.has_links != 0) 3883 server->caps |= NFS_CAP_HARDLINKS; 3884 if (res.has_symlinks != 0) 3885 server->caps |= NFS_CAP_SYMLINKS; 3886 if (res.case_insensitive) 3887 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3888 if (res.case_preserving) 3889 server->caps |= NFS_CAP_CASE_PRESERVING; 3890 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3891 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3892 server->caps |= NFS_CAP_SECURITY_LABEL; 3893 #endif 3894 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3895 server->caps |= NFS_CAP_FS_LOCATIONS; 3896 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3897 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3898 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3899 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3901 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3902 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3903 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3904 NFS_ATTR_FATTR_OWNER_NAME); 3905 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3906 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3907 NFS_ATTR_FATTR_GROUP_NAME); 3908 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3909 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3910 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3911 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3912 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3913 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3914 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3915 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3916 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3917 sizeof(server->attr_bitmask)); 3918 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3919 3920 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3921 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3922 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3923 server->cache_consistency_bitmask[2] = 0; 3924 3925 /* Avoid a regression due to buggy server */ 3926 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3927 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3928 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3929 sizeof(server->exclcreat_bitmask)); 3930 3931 server->acl_bitmask = res.acl_bitmask; 3932 server->fh_expire_type = res.fh_expire_type; 3933 } 3934 3935 return status; 3936 } 3937 3938 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3939 { 3940 struct nfs4_exception exception = { 3941 .interruptible = true, 3942 }; 3943 int err; 3944 3945 nfs4_server_set_init_caps(server); 3946 do { 3947 err = nfs4_handle_exception(server, 3948 _nfs4_server_capabilities(server, fhandle), 3949 &exception); 3950 } while (exception.retry); 3951 return err; 3952 } 3953 3954 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3955 struct nfs_client *clp, 3956 struct nfs_server *server) 3957 { 3958 int i; 3959 3960 for (i = 0; i < location->nservers; i++) { 3961 struct nfs4_string *srv_loc = &location->servers[i]; 3962 struct sockaddr_storage addr; 3963 size_t addrlen; 3964 struct xprt_create xprt_args = { 3965 .ident = 0, 3966 .net = clp->cl_net, 3967 }; 3968 struct nfs4_add_xprt_data xprtdata = { 3969 .clp = clp, 3970 }; 3971 struct rpc_add_xprt_test rpcdata = { 3972 .add_xprt_test = clp->cl_mvops->session_trunk, 3973 .data = &xprtdata, 3974 }; 3975 char *servername = NULL; 3976 3977 if (!srv_loc->len) 3978 continue; 3979 3980 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3981 &addr, sizeof(addr), 3982 clp->cl_net, server->port); 3983 if (!addrlen) 3984 return; 3985 xprt_args.dstaddr = (struct sockaddr *)&addr; 3986 xprt_args.addrlen = addrlen; 3987 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3988 if (!servername) 3989 return; 3990 memcpy(servername, srv_loc->data, srv_loc->len); 3991 servername[srv_loc->len] = '\0'; 3992 xprt_args.servername = servername; 3993 3994 xprtdata.cred = nfs4_get_clid_cred(clp); 3995 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3996 rpc_clnt_setup_test_and_add_xprt, 3997 &rpcdata); 3998 if (xprtdata.cred) 3999 put_cred(xprtdata.cred); 4000 kfree(servername); 4001 } 4002 } 4003 4004 static int _nfs4_discover_trunking(struct nfs_server *server, 4005 struct nfs_fh *fhandle) 4006 { 4007 struct nfs4_fs_locations *locations = NULL; 4008 struct page *page; 4009 const struct cred *cred; 4010 struct nfs_client *clp = server->nfs_client; 4011 const struct nfs4_state_maintenance_ops *ops = 4012 clp->cl_mvops->state_renewal_ops; 4013 int status = -ENOMEM, i; 4014 4015 cred = ops->get_state_renewal_cred(clp); 4016 if (cred == NULL) { 4017 cred = nfs4_get_clid_cred(clp); 4018 if (cred == NULL) 4019 return -ENOKEY; 4020 } 4021 4022 page = alloc_page(GFP_KERNEL); 4023 if (!page) 4024 goto out_put_cred; 4025 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4026 if (!locations) 4027 goto out_free; 4028 locations->fattr = nfs_alloc_fattr(); 4029 if (!locations->fattr) 4030 goto out_free_2; 4031 4032 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4033 cred); 4034 if (status) 4035 goto out_free_3; 4036 4037 for (i = 0; i < locations->nlocations; i++) 4038 test_fs_location_for_trunking(&locations->locations[i], clp, 4039 server); 4040 out_free_3: 4041 kfree(locations->fattr); 4042 out_free_2: 4043 kfree(locations); 4044 out_free: 4045 __free_page(page); 4046 out_put_cred: 4047 put_cred(cred); 4048 return status; 4049 } 4050 4051 static int nfs4_discover_trunking(struct nfs_server *server, 4052 struct nfs_fh *fhandle) 4053 { 4054 struct nfs4_exception exception = { 4055 .interruptible = true, 4056 }; 4057 struct nfs_client *clp = server->nfs_client; 4058 int err = 0; 4059 4060 if (!nfs4_has_session(clp)) 4061 goto out; 4062 do { 4063 err = nfs4_handle_exception(server, 4064 _nfs4_discover_trunking(server, fhandle), 4065 &exception); 4066 } while (exception.retry); 4067 out: 4068 return err; 4069 } 4070 4071 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4072 struct nfs_fsinfo *info) 4073 { 4074 u32 bitmask[3]; 4075 struct nfs4_lookup_root_arg args = { 4076 .bitmask = bitmask, 4077 }; 4078 struct nfs4_lookup_res res = { 4079 .server = server, 4080 .fattr = info->fattr, 4081 .fh = fhandle, 4082 }; 4083 struct rpc_message msg = { 4084 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4085 .rpc_argp = &args, 4086 .rpc_resp = &res, 4087 }; 4088 4089 bitmask[0] = nfs4_fattr_bitmap[0]; 4090 bitmask[1] = nfs4_fattr_bitmap[1]; 4091 /* 4092 * Process the label in the upcoming getfattr 4093 */ 4094 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4095 4096 nfs_fattr_init(info->fattr); 4097 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4098 } 4099 4100 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4101 struct nfs_fsinfo *info) 4102 { 4103 struct nfs4_exception exception = { 4104 .interruptible = true, 4105 }; 4106 int err; 4107 do { 4108 err = _nfs4_lookup_root(server, fhandle, info); 4109 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4110 switch (err) { 4111 case 0: 4112 case -NFS4ERR_WRONGSEC: 4113 goto out; 4114 default: 4115 err = nfs4_handle_exception(server, err, &exception); 4116 } 4117 } while (exception.retry); 4118 out: 4119 return err; 4120 } 4121 4122 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4123 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4124 { 4125 struct rpc_auth_create_args auth_args = { 4126 .pseudoflavor = flavor, 4127 }; 4128 struct rpc_auth *auth; 4129 4130 auth = rpcauth_create(&auth_args, server->client); 4131 if (IS_ERR(auth)) 4132 return -EACCES; 4133 return nfs4_lookup_root(server, fhandle, info); 4134 } 4135 4136 /* 4137 * Retry pseudoroot lookup with various security flavors. We do this when: 4138 * 4139 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4140 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4141 * 4142 * Returns zero on success, or a negative NFS4ERR value, or a 4143 * negative errno value. 4144 */ 4145 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4146 struct nfs_fsinfo *info) 4147 { 4148 /* Per 3530bis 15.33.5 */ 4149 static const rpc_authflavor_t flav_array[] = { 4150 RPC_AUTH_GSS_KRB5P, 4151 RPC_AUTH_GSS_KRB5I, 4152 RPC_AUTH_GSS_KRB5, 4153 RPC_AUTH_UNIX, /* courtesy */ 4154 RPC_AUTH_NULL, 4155 }; 4156 int status = -EPERM; 4157 size_t i; 4158 4159 if (server->auth_info.flavor_len > 0) { 4160 /* try each flavor specified by user */ 4161 for (i = 0; i < server->auth_info.flavor_len; i++) { 4162 status = nfs4_lookup_root_sec(server, fhandle, info, 4163 server->auth_info.flavors[i]); 4164 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4165 continue; 4166 break; 4167 } 4168 } else { 4169 /* no flavors specified by user, try default list */ 4170 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4171 status = nfs4_lookup_root_sec(server, fhandle, info, 4172 flav_array[i]); 4173 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4174 continue; 4175 break; 4176 } 4177 } 4178 4179 /* 4180 * -EACCES could mean that the user doesn't have correct permissions 4181 * to access the mount. It could also mean that we tried to mount 4182 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4183 * existing mount programs don't handle -EACCES very well so it should 4184 * be mapped to -EPERM instead. 4185 */ 4186 if (status == -EACCES) 4187 status = -EPERM; 4188 return status; 4189 } 4190 4191 /** 4192 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4193 * @server: initialized nfs_server handle 4194 * @fhandle: we fill in the pseudo-fs root file handle 4195 * @info: we fill in an FSINFO struct 4196 * @auth_probe: probe the auth flavours 4197 * 4198 * Returns zero on success, or a negative errno. 4199 */ 4200 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4201 struct nfs_fsinfo *info, 4202 bool auth_probe) 4203 { 4204 int status = 0; 4205 4206 if (!auth_probe) 4207 status = nfs4_lookup_root(server, fhandle, info); 4208 4209 if (auth_probe || status == NFS4ERR_WRONGSEC) 4210 status = server->nfs_client->cl_mvops->find_root_sec(server, 4211 fhandle, info); 4212 4213 if (status == 0) 4214 status = nfs4_server_capabilities(server, fhandle); 4215 if (status == 0) 4216 status = nfs4_do_fsinfo(server, fhandle, info); 4217 4218 return nfs4_map_errors(status); 4219 } 4220 4221 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4222 struct nfs_fsinfo *info) 4223 { 4224 int error; 4225 struct nfs_fattr *fattr = info->fattr; 4226 4227 error = nfs4_server_capabilities(server, mntfh); 4228 if (error < 0) { 4229 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4230 return error; 4231 } 4232 4233 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4234 if (error < 0) { 4235 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4236 goto out; 4237 } 4238 4239 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4240 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4241 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4242 4243 out: 4244 return error; 4245 } 4246 4247 /* 4248 * Get locations and (maybe) other attributes of a referral. 4249 * Note that we'll actually follow the referral later when 4250 * we detect fsid mismatch in inode revalidation 4251 */ 4252 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4253 const struct qstr *name, struct nfs_fattr *fattr, 4254 struct nfs_fh *fhandle) 4255 { 4256 int status = -ENOMEM; 4257 struct page *page = NULL; 4258 struct nfs4_fs_locations *locations = NULL; 4259 4260 page = alloc_page(GFP_KERNEL); 4261 if (page == NULL) 4262 goto out; 4263 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4264 if (locations == NULL) 4265 goto out; 4266 4267 locations->fattr = fattr; 4268 4269 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4270 if (status != 0) 4271 goto out; 4272 4273 /* 4274 * If the fsid didn't change, this is a migration event, not a 4275 * referral. Cause us to drop into the exception handler, which 4276 * will kick off migration recovery. 4277 */ 4278 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4279 dprintk("%s: server did not return a different fsid for" 4280 " a referral at %s\n", __func__, name->name); 4281 status = -NFS4ERR_MOVED; 4282 goto out; 4283 } 4284 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4285 nfs_fixup_referral_attributes(fattr); 4286 memset(fhandle, 0, sizeof(struct nfs_fh)); 4287 out: 4288 if (page) 4289 __free_page(page); 4290 kfree(locations); 4291 return status; 4292 } 4293 4294 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4295 struct nfs_fattr *fattr, struct inode *inode) 4296 { 4297 __u32 bitmask[NFS4_BITMASK_SZ]; 4298 struct nfs4_getattr_arg args = { 4299 .fh = fhandle, 4300 .bitmask = bitmask, 4301 }; 4302 struct nfs4_getattr_res res = { 4303 .fattr = fattr, 4304 .server = server, 4305 }; 4306 struct rpc_message msg = { 4307 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4308 .rpc_argp = &args, 4309 .rpc_resp = &res, 4310 }; 4311 unsigned short task_flags = 0; 4312 4313 if (nfs4_has_session(server->nfs_client)) 4314 task_flags = RPC_TASK_MOVEABLE; 4315 4316 /* Is this is an attribute revalidation, subject to softreval? */ 4317 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4318 task_flags |= RPC_TASK_TIMEOUT; 4319 4320 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4321 nfs_fattr_init(fattr); 4322 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4323 return nfs4_do_call_sync(server->client, server, &msg, 4324 &args.seq_args, &res.seq_res, task_flags); 4325 } 4326 4327 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4328 struct nfs_fattr *fattr, struct inode *inode) 4329 { 4330 struct nfs4_exception exception = { 4331 .interruptible = true, 4332 }; 4333 int err; 4334 do { 4335 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4336 trace_nfs4_getattr(server, fhandle, fattr, err); 4337 err = nfs4_handle_exception(server, err, 4338 &exception); 4339 } while (exception.retry); 4340 return err; 4341 } 4342 4343 /* 4344 * The file is not closed if it is opened due to the a request to change 4345 * the size of the file. The open call will not be needed once the 4346 * VFS layer lookup-intents are implemented. 4347 * 4348 * Close is called when the inode is destroyed. 4349 * If we haven't opened the file for O_WRONLY, we 4350 * need to in the size_change case to obtain a stateid. 4351 * 4352 * Got race? 4353 * Because OPEN is always done by name in nfsv4, it is 4354 * possible that we opened a different file by the same 4355 * name. We can recognize this race condition, but we 4356 * can't do anything about it besides returning an error. 4357 * 4358 * This will be fixed with VFS changes (lookup-intent). 4359 */ 4360 static int 4361 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4362 struct iattr *sattr) 4363 { 4364 struct inode *inode = d_inode(dentry); 4365 const struct cred *cred = NULL; 4366 struct nfs_open_context *ctx = NULL; 4367 int status; 4368 4369 if (pnfs_ld_layoutret_on_setattr(inode) && 4370 sattr->ia_valid & ATTR_SIZE && 4371 sattr->ia_size < i_size_read(inode)) 4372 pnfs_commit_and_return_layout(inode); 4373 4374 nfs_fattr_init(fattr); 4375 4376 /* Deal with open(O_TRUNC) */ 4377 if (sattr->ia_valid & ATTR_OPEN) 4378 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4379 4380 /* Optimization: if the end result is no change, don't RPC */ 4381 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4382 return 0; 4383 4384 /* Search for an existing open(O_WRITE) file */ 4385 if (sattr->ia_valid & ATTR_FILE) { 4386 4387 ctx = nfs_file_open_context(sattr->ia_file); 4388 if (ctx) 4389 cred = ctx->cred; 4390 } 4391 4392 /* Return any delegations if we're going to change ACLs */ 4393 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4394 nfs4_inode_make_writeable(inode); 4395 4396 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4397 if (status == 0) { 4398 nfs_setattr_update_inode(inode, sattr, fattr); 4399 nfs_setsecurity(inode, fattr); 4400 } 4401 return status; 4402 } 4403 4404 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4405 struct dentry *dentry, struct nfs_fh *fhandle, 4406 struct nfs_fattr *fattr) 4407 { 4408 struct nfs_server *server = NFS_SERVER(dir); 4409 int status; 4410 struct nfs4_lookup_arg args = { 4411 .bitmask = server->attr_bitmask, 4412 .dir_fh = NFS_FH(dir), 4413 .name = &dentry->d_name, 4414 }; 4415 struct nfs4_lookup_res res = { 4416 .server = server, 4417 .fattr = fattr, 4418 .fh = fhandle, 4419 }; 4420 struct rpc_message msg = { 4421 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4422 .rpc_argp = &args, 4423 .rpc_resp = &res, 4424 }; 4425 unsigned short task_flags = 0; 4426 4427 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4428 task_flags = RPC_TASK_MOVEABLE; 4429 4430 /* Is this is an attribute revalidation, subject to softreval? */ 4431 if (nfs_lookup_is_soft_revalidate(dentry)) 4432 task_flags |= RPC_TASK_TIMEOUT; 4433 4434 args.bitmask = nfs4_bitmask(server, fattr->label); 4435 4436 nfs_fattr_init(fattr); 4437 4438 dprintk("NFS call lookup %pd2\n", dentry); 4439 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4440 status = nfs4_do_call_sync(clnt, server, &msg, 4441 &args.seq_args, &res.seq_res, task_flags); 4442 dprintk("NFS reply lookup: %d\n", status); 4443 return status; 4444 } 4445 4446 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4447 { 4448 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4449 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4450 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4451 fattr->nlink = 2; 4452 } 4453 4454 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4455 struct dentry *dentry, struct nfs_fh *fhandle, 4456 struct nfs_fattr *fattr) 4457 { 4458 struct nfs4_exception exception = { 4459 .interruptible = true, 4460 }; 4461 struct rpc_clnt *client = *clnt; 4462 const struct qstr *name = &dentry->d_name; 4463 int err; 4464 do { 4465 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4466 trace_nfs4_lookup(dir, name, err); 4467 switch (err) { 4468 case -NFS4ERR_BADNAME: 4469 err = -ENOENT; 4470 goto out; 4471 case -NFS4ERR_MOVED: 4472 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4473 if (err == -NFS4ERR_MOVED) 4474 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4475 goto out; 4476 case -NFS4ERR_WRONGSEC: 4477 err = -EPERM; 4478 if (client != *clnt) 4479 goto out; 4480 client = nfs4_negotiate_security(client, dir, name); 4481 if (IS_ERR(client)) 4482 return PTR_ERR(client); 4483 4484 exception.retry = 1; 4485 break; 4486 default: 4487 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4488 } 4489 } while (exception.retry); 4490 4491 out: 4492 if (err == 0) 4493 *clnt = client; 4494 else if (client != *clnt) 4495 rpc_shutdown_client(client); 4496 4497 return err; 4498 } 4499 4500 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4501 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4502 { 4503 int status; 4504 struct rpc_clnt *client = NFS_CLIENT(dir); 4505 4506 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4507 if (client != NFS_CLIENT(dir)) { 4508 rpc_shutdown_client(client); 4509 nfs_fixup_secinfo_attributes(fattr); 4510 } 4511 return status; 4512 } 4513 4514 struct rpc_clnt * 4515 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4516 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4517 { 4518 struct rpc_clnt *client = NFS_CLIENT(dir); 4519 int status; 4520 4521 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4522 if (status < 0) 4523 return ERR_PTR(status); 4524 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4525 } 4526 4527 static int _nfs4_proc_lookupp(struct inode *inode, 4528 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4529 { 4530 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4531 struct nfs_server *server = NFS_SERVER(inode); 4532 int status; 4533 struct nfs4_lookupp_arg args = { 4534 .bitmask = server->attr_bitmask, 4535 .fh = NFS_FH(inode), 4536 }; 4537 struct nfs4_lookupp_res res = { 4538 .server = server, 4539 .fattr = fattr, 4540 .fh = fhandle, 4541 }; 4542 struct rpc_message msg = { 4543 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4544 .rpc_argp = &args, 4545 .rpc_resp = &res, 4546 }; 4547 unsigned short task_flags = 0; 4548 4549 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4550 task_flags |= RPC_TASK_TIMEOUT; 4551 4552 args.bitmask = nfs4_bitmask(server, fattr->label); 4553 4554 nfs_fattr_init(fattr); 4555 4556 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4557 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4558 &res.seq_res, task_flags); 4559 dprintk("NFS reply lookupp: %d\n", status); 4560 return status; 4561 } 4562 4563 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4564 struct nfs_fattr *fattr) 4565 { 4566 struct nfs4_exception exception = { 4567 .interruptible = true, 4568 }; 4569 int err; 4570 do { 4571 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4572 trace_nfs4_lookupp(inode, err); 4573 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4574 &exception); 4575 } while (exception.retry); 4576 return err; 4577 } 4578 4579 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4580 const struct cred *cred) 4581 { 4582 struct nfs_server *server = NFS_SERVER(inode); 4583 struct nfs4_accessargs args = { 4584 .fh = NFS_FH(inode), 4585 .access = entry->mask, 4586 }; 4587 struct nfs4_accessres res = { 4588 .server = server, 4589 }; 4590 struct rpc_message msg = { 4591 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4592 .rpc_argp = &args, 4593 .rpc_resp = &res, 4594 .rpc_cred = cred, 4595 }; 4596 int status = 0; 4597 4598 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4599 res.fattr = nfs_alloc_fattr(); 4600 if (res.fattr == NULL) 4601 return -ENOMEM; 4602 args.bitmask = server->cache_consistency_bitmask; 4603 } 4604 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4605 if (!status) { 4606 nfs_access_set_mask(entry, res.access); 4607 if (res.fattr) 4608 nfs_refresh_inode(inode, res.fattr); 4609 } 4610 nfs_free_fattr(res.fattr); 4611 return status; 4612 } 4613 4614 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4615 const struct cred *cred) 4616 { 4617 struct nfs4_exception exception = { 4618 .interruptible = true, 4619 }; 4620 int err; 4621 do { 4622 err = _nfs4_proc_access(inode, entry, cred); 4623 trace_nfs4_access(inode, err); 4624 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4625 &exception); 4626 } while (exception.retry); 4627 return err; 4628 } 4629 4630 /* 4631 * TODO: For the time being, we don't try to get any attributes 4632 * along with any of the zero-copy operations READ, READDIR, 4633 * READLINK, WRITE. 4634 * 4635 * In the case of the first three, we want to put the GETATTR 4636 * after the read-type operation -- this is because it is hard 4637 * to predict the length of a GETATTR response in v4, and thus 4638 * align the READ data correctly. This means that the GETATTR 4639 * may end up partially falling into the page cache, and we should 4640 * shift it into the 'tail' of the xdr_buf before processing. 4641 * To do this efficiently, we need to know the total length 4642 * of data received, which doesn't seem to be available outside 4643 * of the RPC layer. 4644 * 4645 * In the case of WRITE, we also want to put the GETATTR after 4646 * the operation -- in this case because we want to make sure 4647 * we get the post-operation mtime and size. 4648 * 4649 * Both of these changes to the XDR layer would in fact be quite 4650 * minor, but I decided to leave them for a subsequent patch. 4651 */ 4652 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4653 unsigned int pgbase, unsigned int pglen) 4654 { 4655 struct nfs4_readlink args = { 4656 .fh = NFS_FH(inode), 4657 .pgbase = pgbase, 4658 .pglen = pglen, 4659 .pages = &page, 4660 }; 4661 struct nfs4_readlink_res res; 4662 struct rpc_message msg = { 4663 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4664 .rpc_argp = &args, 4665 .rpc_resp = &res, 4666 }; 4667 4668 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4669 } 4670 4671 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4672 unsigned int pgbase, unsigned int pglen) 4673 { 4674 struct nfs4_exception exception = { 4675 .interruptible = true, 4676 }; 4677 int err; 4678 do { 4679 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4680 trace_nfs4_readlink(inode, err); 4681 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4682 &exception); 4683 } while (exception.retry); 4684 return err; 4685 } 4686 4687 /* 4688 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4689 */ 4690 static int 4691 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4692 int flags) 4693 { 4694 struct nfs_server *server = NFS_SERVER(dir); 4695 struct nfs4_label l, *ilabel; 4696 struct nfs_open_context *ctx; 4697 struct nfs4_state *state; 4698 int status = 0; 4699 4700 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4701 if (IS_ERR(ctx)) 4702 return PTR_ERR(ctx); 4703 4704 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4705 4706 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4707 sattr->ia_mode &= ~current_umask(); 4708 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4709 if (IS_ERR(state)) { 4710 status = PTR_ERR(state); 4711 goto out; 4712 } 4713 out: 4714 nfs4_label_release_security(ilabel); 4715 put_nfs_open_context(ctx); 4716 return status; 4717 } 4718 4719 static int 4720 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4721 { 4722 struct nfs_server *server = NFS_SERVER(dir); 4723 struct nfs_removeargs args = { 4724 .fh = NFS_FH(dir), 4725 .name = *name, 4726 }; 4727 struct nfs_removeres res = { 4728 .server = server, 4729 }; 4730 struct rpc_message msg = { 4731 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4732 .rpc_argp = &args, 4733 .rpc_resp = &res, 4734 }; 4735 unsigned long timestamp = jiffies; 4736 int status; 4737 4738 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4739 if (status == 0) { 4740 spin_lock(&dir->i_lock); 4741 /* Removing a directory decrements nlink in the parent */ 4742 if (ftype == NF4DIR && dir->i_nlink > 2) 4743 nfs4_dec_nlink_locked(dir); 4744 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4745 NFS_INO_INVALID_DATA); 4746 spin_unlock(&dir->i_lock); 4747 } 4748 return status; 4749 } 4750 4751 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4752 { 4753 struct nfs4_exception exception = { 4754 .interruptible = true, 4755 }; 4756 struct inode *inode = d_inode(dentry); 4757 int err; 4758 4759 if (inode) { 4760 if (inode->i_nlink == 1) 4761 nfs4_inode_return_delegation(inode); 4762 else 4763 nfs4_inode_make_writeable(inode); 4764 } 4765 do { 4766 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4767 trace_nfs4_remove(dir, &dentry->d_name, err); 4768 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4769 &exception); 4770 } while (exception.retry); 4771 return err; 4772 } 4773 4774 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4775 { 4776 struct nfs4_exception exception = { 4777 .interruptible = true, 4778 }; 4779 int err; 4780 4781 do { 4782 err = _nfs4_proc_remove(dir, name, NF4DIR); 4783 trace_nfs4_remove(dir, name, err); 4784 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4785 &exception); 4786 } while (exception.retry); 4787 return err; 4788 } 4789 4790 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4791 struct dentry *dentry, 4792 struct inode *inode) 4793 { 4794 struct nfs_removeargs *args = msg->rpc_argp; 4795 struct nfs_removeres *res = msg->rpc_resp; 4796 4797 res->server = NFS_SB(dentry->d_sb); 4798 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4799 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4800 4801 nfs_fattr_init(res->dir_attr); 4802 4803 if (inode) { 4804 nfs4_inode_return_delegation(inode); 4805 nfs_d_prune_case_insensitive_aliases(inode); 4806 } 4807 } 4808 4809 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4810 { 4811 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4812 &data->args.seq_args, 4813 &data->res.seq_res, 4814 task); 4815 } 4816 4817 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4818 { 4819 struct nfs_unlinkdata *data = task->tk_calldata; 4820 struct nfs_removeres *res = &data->res; 4821 4822 if (!nfs4_sequence_done(task, &res->seq_res)) 4823 return 0; 4824 if (nfs4_async_handle_error(task, res->server, NULL, 4825 &data->timeout) == -EAGAIN) 4826 return 0; 4827 if (task->tk_status == 0) 4828 nfs4_update_changeattr(dir, &res->cinfo, 4829 res->dir_attr->time_start, 4830 NFS_INO_INVALID_DATA); 4831 return 1; 4832 } 4833 4834 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4835 struct dentry *old_dentry, 4836 struct dentry *new_dentry) 4837 { 4838 struct nfs_renameargs *arg = msg->rpc_argp; 4839 struct nfs_renameres *res = msg->rpc_resp; 4840 struct inode *old_inode = d_inode(old_dentry); 4841 struct inode *new_inode = d_inode(new_dentry); 4842 4843 if (old_inode) 4844 nfs4_inode_make_writeable(old_inode); 4845 if (new_inode) 4846 nfs4_inode_return_delegation(new_inode); 4847 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4848 res->server = NFS_SB(old_dentry->d_sb); 4849 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4850 } 4851 4852 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4853 { 4854 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4855 &data->args.seq_args, 4856 &data->res.seq_res, 4857 task); 4858 } 4859 4860 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4861 struct inode *new_dir) 4862 { 4863 struct nfs_renamedata *data = task->tk_calldata; 4864 struct nfs_renameres *res = &data->res; 4865 4866 if (!nfs4_sequence_done(task, &res->seq_res)) 4867 return 0; 4868 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4869 return 0; 4870 4871 if (task->tk_status == 0) { 4872 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4873 if (new_dir != old_dir) { 4874 /* Note: If we moved a directory, nlink will change */ 4875 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4876 res->old_fattr->time_start, 4877 NFS_INO_INVALID_NLINK | 4878 NFS_INO_INVALID_DATA); 4879 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4880 res->new_fattr->time_start, 4881 NFS_INO_INVALID_NLINK | 4882 NFS_INO_INVALID_DATA); 4883 } else 4884 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4885 res->old_fattr->time_start, 4886 NFS_INO_INVALID_DATA); 4887 } 4888 return 1; 4889 } 4890 4891 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4892 { 4893 struct nfs_server *server = NFS_SERVER(inode); 4894 __u32 bitmask[NFS4_BITMASK_SZ]; 4895 struct nfs4_link_arg arg = { 4896 .fh = NFS_FH(inode), 4897 .dir_fh = NFS_FH(dir), 4898 .name = name, 4899 .bitmask = bitmask, 4900 }; 4901 struct nfs4_link_res res = { 4902 .server = server, 4903 }; 4904 struct rpc_message msg = { 4905 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4906 .rpc_argp = &arg, 4907 .rpc_resp = &res, 4908 }; 4909 int status = -ENOMEM; 4910 4911 res.fattr = nfs_alloc_fattr_with_label(server); 4912 if (res.fattr == NULL) 4913 goto out; 4914 4915 nfs4_inode_make_writeable(inode); 4916 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4917 NFS_INO_INVALID_CHANGE); 4918 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4919 if (!status) { 4920 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4921 NFS_INO_INVALID_DATA); 4922 nfs4_inc_nlink(inode); 4923 status = nfs_post_op_update_inode(inode, res.fattr); 4924 if (!status) 4925 nfs_setsecurity(inode, res.fattr); 4926 } 4927 4928 out: 4929 nfs_free_fattr(res.fattr); 4930 return status; 4931 } 4932 4933 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4934 { 4935 struct nfs4_exception exception = { 4936 .interruptible = true, 4937 }; 4938 int err; 4939 do { 4940 err = nfs4_handle_exception(NFS_SERVER(inode), 4941 _nfs4_proc_link(inode, dir, name), 4942 &exception); 4943 } while (exception.retry); 4944 return err; 4945 } 4946 4947 struct nfs4_createdata { 4948 struct rpc_message msg; 4949 struct nfs4_create_arg arg; 4950 struct nfs4_create_res res; 4951 struct nfs_fh fh; 4952 struct nfs_fattr fattr; 4953 }; 4954 4955 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4956 const struct qstr *name, struct iattr *sattr, u32 ftype) 4957 { 4958 struct nfs4_createdata *data; 4959 4960 data = kzalloc(sizeof(*data), GFP_KERNEL); 4961 if (data != NULL) { 4962 struct nfs_server *server = NFS_SERVER(dir); 4963 4964 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4965 if (IS_ERR(data->fattr.label)) 4966 goto out_free; 4967 4968 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4969 data->msg.rpc_argp = &data->arg; 4970 data->msg.rpc_resp = &data->res; 4971 data->arg.dir_fh = NFS_FH(dir); 4972 data->arg.server = server; 4973 data->arg.name = name; 4974 data->arg.attrs = sattr; 4975 data->arg.ftype = ftype; 4976 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4977 data->arg.umask = current_umask(); 4978 data->res.server = server; 4979 data->res.fh = &data->fh; 4980 data->res.fattr = &data->fattr; 4981 nfs_fattr_init(data->res.fattr); 4982 } 4983 return data; 4984 out_free: 4985 kfree(data); 4986 return NULL; 4987 } 4988 4989 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4990 { 4991 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4992 &data->arg.seq_args, &data->res.seq_res, 1); 4993 if (status == 0) { 4994 spin_lock(&dir->i_lock); 4995 /* Creating a directory bumps nlink in the parent */ 4996 if (data->arg.ftype == NF4DIR) 4997 nfs4_inc_nlink_locked(dir); 4998 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4999 data->res.fattr->time_start, 5000 NFS_INO_INVALID_DATA); 5001 spin_unlock(&dir->i_lock); 5002 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5003 } 5004 return status; 5005 } 5006 5007 static void nfs4_free_createdata(struct nfs4_createdata *data) 5008 { 5009 nfs4_label_free(data->fattr.label); 5010 kfree(data); 5011 } 5012 5013 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5014 struct page *page, unsigned int len, struct iattr *sattr, 5015 struct nfs4_label *label) 5016 { 5017 struct nfs4_createdata *data; 5018 int status = -ENAMETOOLONG; 5019 5020 if (len > NFS4_MAXPATHLEN) 5021 goto out; 5022 5023 status = -ENOMEM; 5024 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5025 if (data == NULL) 5026 goto out; 5027 5028 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5029 data->arg.u.symlink.pages = &page; 5030 data->arg.u.symlink.len = len; 5031 data->arg.label = label; 5032 5033 status = nfs4_do_create(dir, dentry, data); 5034 5035 nfs4_free_createdata(data); 5036 out: 5037 return status; 5038 } 5039 5040 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5041 struct page *page, unsigned int len, struct iattr *sattr) 5042 { 5043 struct nfs4_exception exception = { 5044 .interruptible = true, 5045 }; 5046 struct nfs4_label l, *label; 5047 int err; 5048 5049 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5050 5051 do { 5052 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5053 trace_nfs4_symlink(dir, &dentry->d_name, err); 5054 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5055 &exception); 5056 } while (exception.retry); 5057 5058 nfs4_label_release_security(label); 5059 return err; 5060 } 5061 5062 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5063 struct iattr *sattr, struct nfs4_label *label) 5064 { 5065 struct nfs4_createdata *data; 5066 int status = -ENOMEM; 5067 5068 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5069 if (data == NULL) 5070 goto out; 5071 5072 data->arg.label = label; 5073 status = nfs4_do_create(dir, dentry, data); 5074 5075 nfs4_free_createdata(data); 5076 out: 5077 return status; 5078 } 5079 5080 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5081 struct iattr *sattr) 5082 { 5083 struct nfs_server *server = NFS_SERVER(dir); 5084 struct nfs4_exception exception = { 5085 .interruptible = true, 5086 }; 5087 struct nfs4_label l, *label; 5088 int err; 5089 5090 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5091 5092 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5093 sattr->ia_mode &= ~current_umask(); 5094 do { 5095 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5096 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5097 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5098 &exception); 5099 } while (exception.retry); 5100 nfs4_label_release_security(label); 5101 5102 return err; 5103 } 5104 5105 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5106 struct nfs_readdir_res *nr_res) 5107 { 5108 struct inode *dir = d_inode(nr_arg->dentry); 5109 struct nfs_server *server = NFS_SERVER(dir); 5110 struct nfs4_readdir_arg args = { 5111 .fh = NFS_FH(dir), 5112 .pages = nr_arg->pages, 5113 .pgbase = 0, 5114 .count = nr_arg->page_len, 5115 .plus = nr_arg->plus, 5116 }; 5117 struct nfs4_readdir_res res; 5118 struct rpc_message msg = { 5119 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5120 .rpc_argp = &args, 5121 .rpc_resp = &res, 5122 .rpc_cred = nr_arg->cred, 5123 }; 5124 int status; 5125 5126 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5127 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5128 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5129 args.bitmask = server->attr_bitmask_nl; 5130 else 5131 args.bitmask = server->attr_bitmask; 5132 5133 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5134 res.pgbase = args.pgbase; 5135 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5136 &res.seq_res, 0); 5137 if (status >= 0) { 5138 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5139 status += args.pgbase; 5140 } 5141 5142 nfs_invalidate_atime(dir); 5143 5144 dprintk("%s: returns %d\n", __func__, status); 5145 return status; 5146 } 5147 5148 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5149 struct nfs_readdir_res *res) 5150 { 5151 struct nfs4_exception exception = { 5152 .interruptible = true, 5153 }; 5154 int err; 5155 do { 5156 err = _nfs4_proc_readdir(arg, res); 5157 trace_nfs4_readdir(d_inode(arg->dentry), err); 5158 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5159 err, &exception); 5160 } while (exception.retry); 5161 return err; 5162 } 5163 5164 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5165 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5166 { 5167 struct nfs4_createdata *data; 5168 int mode = sattr->ia_mode; 5169 int status = -ENOMEM; 5170 5171 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5172 if (data == NULL) 5173 goto out; 5174 5175 if (S_ISFIFO(mode)) 5176 data->arg.ftype = NF4FIFO; 5177 else if (S_ISBLK(mode)) { 5178 data->arg.ftype = NF4BLK; 5179 data->arg.u.device.specdata1 = MAJOR(rdev); 5180 data->arg.u.device.specdata2 = MINOR(rdev); 5181 } 5182 else if (S_ISCHR(mode)) { 5183 data->arg.ftype = NF4CHR; 5184 data->arg.u.device.specdata1 = MAJOR(rdev); 5185 data->arg.u.device.specdata2 = MINOR(rdev); 5186 } else if (!S_ISSOCK(mode)) { 5187 status = -EINVAL; 5188 goto out_free; 5189 } 5190 5191 data->arg.label = label; 5192 status = nfs4_do_create(dir, dentry, data); 5193 out_free: 5194 nfs4_free_createdata(data); 5195 out: 5196 return status; 5197 } 5198 5199 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5200 struct iattr *sattr, dev_t rdev) 5201 { 5202 struct nfs_server *server = NFS_SERVER(dir); 5203 struct nfs4_exception exception = { 5204 .interruptible = true, 5205 }; 5206 struct nfs4_label l, *label; 5207 int err; 5208 5209 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5210 5211 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5212 sattr->ia_mode &= ~current_umask(); 5213 do { 5214 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5215 trace_nfs4_mknod(dir, &dentry->d_name, err); 5216 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5217 &exception); 5218 } while (exception.retry); 5219 5220 nfs4_label_release_security(label); 5221 5222 return err; 5223 } 5224 5225 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5226 struct nfs_fsstat *fsstat) 5227 { 5228 struct nfs4_statfs_arg args = { 5229 .fh = fhandle, 5230 .bitmask = server->attr_bitmask, 5231 }; 5232 struct nfs4_statfs_res res = { 5233 .fsstat = fsstat, 5234 }; 5235 struct rpc_message msg = { 5236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5237 .rpc_argp = &args, 5238 .rpc_resp = &res, 5239 }; 5240 5241 nfs_fattr_init(fsstat->fattr); 5242 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5243 } 5244 5245 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5246 { 5247 struct nfs4_exception exception = { 5248 .interruptible = true, 5249 }; 5250 int err; 5251 do { 5252 err = nfs4_handle_exception(server, 5253 _nfs4_proc_statfs(server, fhandle, fsstat), 5254 &exception); 5255 } while (exception.retry); 5256 return err; 5257 } 5258 5259 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5260 struct nfs_fsinfo *fsinfo) 5261 { 5262 struct nfs4_fsinfo_arg args = { 5263 .fh = fhandle, 5264 .bitmask = server->attr_bitmask, 5265 }; 5266 struct nfs4_fsinfo_res res = { 5267 .fsinfo = fsinfo, 5268 }; 5269 struct rpc_message msg = { 5270 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5271 .rpc_argp = &args, 5272 .rpc_resp = &res, 5273 }; 5274 5275 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5276 } 5277 5278 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5279 { 5280 struct nfs4_exception exception = { 5281 .interruptible = true, 5282 }; 5283 int err; 5284 5285 do { 5286 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5287 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5288 if (err == 0) { 5289 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5290 break; 5291 } 5292 err = nfs4_handle_exception(server, err, &exception); 5293 } while (exception.retry); 5294 return err; 5295 } 5296 5297 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5298 { 5299 int error; 5300 5301 nfs_fattr_init(fsinfo->fattr); 5302 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5303 if (error == 0) { 5304 /* block layout checks this! */ 5305 server->pnfs_blksize = fsinfo->blksize; 5306 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5307 } 5308 5309 return error; 5310 } 5311 5312 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5313 struct nfs_pathconf *pathconf) 5314 { 5315 struct nfs4_pathconf_arg args = { 5316 .fh = fhandle, 5317 .bitmask = server->attr_bitmask, 5318 }; 5319 struct nfs4_pathconf_res res = { 5320 .pathconf = pathconf, 5321 }; 5322 struct rpc_message msg = { 5323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5324 .rpc_argp = &args, 5325 .rpc_resp = &res, 5326 }; 5327 5328 /* None of the pathconf attributes are mandatory to implement */ 5329 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5330 memset(pathconf, 0, sizeof(*pathconf)); 5331 return 0; 5332 } 5333 5334 nfs_fattr_init(pathconf->fattr); 5335 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5336 } 5337 5338 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5339 struct nfs_pathconf *pathconf) 5340 { 5341 struct nfs4_exception exception = { 5342 .interruptible = true, 5343 }; 5344 int err; 5345 5346 do { 5347 err = nfs4_handle_exception(server, 5348 _nfs4_proc_pathconf(server, fhandle, pathconf), 5349 &exception); 5350 } while (exception.retry); 5351 return err; 5352 } 5353 5354 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5355 const struct nfs_open_context *ctx, 5356 const struct nfs_lock_context *l_ctx, 5357 fmode_t fmode) 5358 { 5359 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5360 } 5361 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5362 5363 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5364 const struct nfs_open_context *ctx, 5365 const struct nfs_lock_context *l_ctx, 5366 fmode_t fmode) 5367 { 5368 nfs4_stateid _current_stateid; 5369 5370 /* If the current stateid represents a lost lock, then exit */ 5371 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5372 return true; 5373 return nfs4_stateid_match(stateid, &_current_stateid); 5374 } 5375 5376 static bool nfs4_error_stateid_expired(int err) 5377 { 5378 switch (err) { 5379 case -NFS4ERR_DELEG_REVOKED: 5380 case -NFS4ERR_ADMIN_REVOKED: 5381 case -NFS4ERR_BAD_STATEID: 5382 case -NFS4ERR_STALE_STATEID: 5383 case -NFS4ERR_OLD_STATEID: 5384 case -NFS4ERR_OPENMODE: 5385 case -NFS4ERR_EXPIRED: 5386 return true; 5387 } 5388 return false; 5389 } 5390 5391 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5392 { 5393 struct nfs_server *server = NFS_SERVER(hdr->inode); 5394 5395 trace_nfs4_read(hdr, task->tk_status); 5396 if (task->tk_status < 0) { 5397 struct nfs4_exception exception = { 5398 .inode = hdr->inode, 5399 .state = hdr->args.context->state, 5400 .stateid = &hdr->args.stateid, 5401 }; 5402 task->tk_status = nfs4_async_handle_exception(task, 5403 server, task->tk_status, &exception); 5404 if (exception.retry) { 5405 rpc_restart_call_prepare(task); 5406 return -EAGAIN; 5407 } 5408 } 5409 5410 if (task->tk_status > 0) 5411 renew_lease(server, hdr->timestamp); 5412 return 0; 5413 } 5414 5415 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5416 struct nfs_pgio_args *args) 5417 { 5418 5419 if (!nfs4_error_stateid_expired(task->tk_status) || 5420 nfs4_stateid_is_current(&args->stateid, 5421 args->context, 5422 args->lock_context, 5423 FMODE_READ)) 5424 return false; 5425 rpc_restart_call_prepare(task); 5426 return true; 5427 } 5428 5429 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5430 struct nfs_pgio_header *hdr) 5431 { 5432 struct nfs_server *server = NFS_SERVER(hdr->inode); 5433 struct rpc_message *msg = &task->tk_msg; 5434 5435 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5436 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5437 server->caps &= ~NFS_CAP_READ_PLUS; 5438 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5439 rpc_restart_call_prepare(task); 5440 return true; 5441 } 5442 return false; 5443 } 5444 5445 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5446 { 5447 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5448 return -EAGAIN; 5449 if (nfs4_read_stateid_changed(task, &hdr->args)) 5450 return -EAGAIN; 5451 if (nfs4_read_plus_not_supported(task, hdr)) 5452 return -EAGAIN; 5453 if (task->tk_status > 0) 5454 nfs_invalidate_atime(hdr->inode); 5455 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5456 nfs4_read_done_cb(task, hdr); 5457 } 5458 5459 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5460 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5461 struct rpc_message *msg) 5462 { 5463 /* Note: We don't use READ_PLUS with pNFS yet */ 5464 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5465 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5466 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5467 } 5468 return false; 5469 } 5470 #else 5471 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5472 struct rpc_message *msg) 5473 { 5474 return false; 5475 } 5476 #endif /* CONFIG_NFS_V4_2 */ 5477 5478 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5479 struct rpc_message *msg) 5480 { 5481 hdr->timestamp = jiffies; 5482 if (!hdr->pgio_done_cb) 5483 hdr->pgio_done_cb = nfs4_read_done_cb; 5484 if (!nfs42_read_plus_support(hdr, msg)) 5485 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5486 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5487 } 5488 5489 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5490 struct nfs_pgio_header *hdr) 5491 { 5492 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5493 &hdr->args.seq_args, 5494 &hdr->res.seq_res, 5495 task)) 5496 return 0; 5497 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5498 hdr->args.lock_context, 5499 hdr->rw_mode) == -EIO) 5500 return -EIO; 5501 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5502 return -EIO; 5503 return 0; 5504 } 5505 5506 static int nfs4_write_done_cb(struct rpc_task *task, 5507 struct nfs_pgio_header *hdr) 5508 { 5509 struct inode *inode = hdr->inode; 5510 5511 trace_nfs4_write(hdr, task->tk_status); 5512 if (task->tk_status < 0) { 5513 struct nfs4_exception exception = { 5514 .inode = hdr->inode, 5515 .state = hdr->args.context->state, 5516 .stateid = &hdr->args.stateid, 5517 }; 5518 task->tk_status = nfs4_async_handle_exception(task, 5519 NFS_SERVER(inode), task->tk_status, 5520 &exception); 5521 if (exception.retry) { 5522 rpc_restart_call_prepare(task); 5523 return -EAGAIN; 5524 } 5525 } 5526 if (task->tk_status >= 0) { 5527 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5528 nfs_writeback_update_inode(hdr); 5529 } 5530 return 0; 5531 } 5532 5533 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5534 struct nfs_pgio_args *args) 5535 { 5536 5537 if (!nfs4_error_stateid_expired(task->tk_status) || 5538 nfs4_stateid_is_current(&args->stateid, 5539 args->context, 5540 args->lock_context, 5541 FMODE_WRITE)) 5542 return false; 5543 rpc_restart_call_prepare(task); 5544 return true; 5545 } 5546 5547 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5548 { 5549 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5550 return -EAGAIN; 5551 if (nfs4_write_stateid_changed(task, &hdr->args)) 5552 return -EAGAIN; 5553 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5554 nfs4_write_done_cb(task, hdr); 5555 } 5556 5557 static 5558 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5559 { 5560 /* Don't request attributes for pNFS or O_DIRECT writes */ 5561 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5562 return false; 5563 /* Otherwise, request attributes if and only if we don't hold 5564 * a delegation 5565 */ 5566 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5567 } 5568 5569 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5570 struct inode *inode, unsigned long cache_validity) 5571 { 5572 struct nfs_server *server = NFS_SERVER(inode); 5573 unsigned int i; 5574 5575 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5576 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5577 5578 if (cache_validity & NFS_INO_INVALID_CHANGE) 5579 bitmask[0] |= FATTR4_WORD0_CHANGE; 5580 if (cache_validity & NFS_INO_INVALID_ATIME) 5581 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5582 if (cache_validity & NFS_INO_INVALID_MODE) 5583 bitmask[1] |= FATTR4_WORD1_MODE; 5584 if (cache_validity & NFS_INO_INVALID_OTHER) 5585 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5586 if (cache_validity & NFS_INO_INVALID_NLINK) 5587 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5588 if (cache_validity & NFS_INO_INVALID_CTIME) 5589 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5590 if (cache_validity & NFS_INO_INVALID_MTIME) 5591 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5592 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5593 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5594 5595 if (cache_validity & NFS_INO_INVALID_SIZE) 5596 bitmask[0] |= FATTR4_WORD0_SIZE; 5597 5598 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5599 bitmask[i] &= server->attr_bitmask[i]; 5600 } 5601 5602 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5603 struct rpc_message *msg, 5604 struct rpc_clnt **clnt) 5605 { 5606 struct nfs_server *server = NFS_SERVER(hdr->inode); 5607 5608 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5609 hdr->args.bitmask = NULL; 5610 hdr->res.fattr = NULL; 5611 } else { 5612 nfs4_bitmask_set(hdr->args.bitmask_store, 5613 server->cache_consistency_bitmask, 5614 hdr->inode, NFS_INO_INVALID_BLOCKS); 5615 hdr->args.bitmask = hdr->args.bitmask_store; 5616 } 5617 5618 if (!hdr->pgio_done_cb) 5619 hdr->pgio_done_cb = nfs4_write_done_cb; 5620 hdr->res.server = server; 5621 hdr->timestamp = jiffies; 5622 5623 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5624 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5625 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5626 } 5627 5628 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5629 { 5630 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5631 &data->args.seq_args, 5632 &data->res.seq_res, 5633 task); 5634 } 5635 5636 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5637 { 5638 struct inode *inode = data->inode; 5639 5640 trace_nfs4_commit(data, task->tk_status); 5641 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5642 NULL, NULL) == -EAGAIN) { 5643 rpc_restart_call_prepare(task); 5644 return -EAGAIN; 5645 } 5646 return 0; 5647 } 5648 5649 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5650 { 5651 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5652 return -EAGAIN; 5653 return data->commit_done_cb(task, data); 5654 } 5655 5656 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5657 struct rpc_clnt **clnt) 5658 { 5659 struct nfs_server *server = NFS_SERVER(data->inode); 5660 5661 if (data->commit_done_cb == NULL) 5662 data->commit_done_cb = nfs4_commit_done_cb; 5663 data->res.server = server; 5664 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5665 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5666 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5667 } 5668 5669 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5670 struct nfs_commitres *res) 5671 { 5672 struct inode *dst_inode = file_inode(dst); 5673 struct nfs_server *server = NFS_SERVER(dst_inode); 5674 struct rpc_message msg = { 5675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5676 .rpc_argp = args, 5677 .rpc_resp = res, 5678 }; 5679 5680 args->fh = NFS_FH(dst_inode); 5681 return nfs4_call_sync(server->client, server, &msg, 5682 &args->seq_args, &res->seq_res, 1); 5683 } 5684 5685 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5686 { 5687 struct nfs_commitargs args = { 5688 .offset = offset, 5689 .count = count, 5690 }; 5691 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5692 struct nfs4_exception exception = { }; 5693 int status; 5694 5695 do { 5696 status = _nfs4_proc_commit(dst, &args, res); 5697 status = nfs4_handle_exception(dst_server, status, &exception); 5698 } while (exception.retry); 5699 5700 return status; 5701 } 5702 5703 struct nfs4_renewdata { 5704 struct nfs_client *client; 5705 unsigned long timestamp; 5706 }; 5707 5708 /* 5709 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5710 * standalone procedure for queueing an asynchronous RENEW. 5711 */ 5712 static void nfs4_renew_release(void *calldata) 5713 { 5714 struct nfs4_renewdata *data = calldata; 5715 struct nfs_client *clp = data->client; 5716 5717 if (refcount_read(&clp->cl_count) > 1) 5718 nfs4_schedule_state_renewal(clp); 5719 nfs_put_client(clp); 5720 kfree(data); 5721 } 5722 5723 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5724 { 5725 struct nfs4_renewdata *data = calldata; 5726 struct nfs_client *clp = data->client; 5727 unsigned long timestamp = data->timestamp; 5728 5729 trace_nfs4_renew_async(clp, task->tk_status); 5730 switch (task->tk_status) { 5731 case 0: 5732 break; 5733 case -NFS4ERR_LEASE_MOVED: 5734 nfs4_schedule_lease_moved_recovery(clp); 5735 break; 5736 default: 5737 /* Unless we're shutting down, schedule state recovery! */ 5738 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5739 return; 5740 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5741 nfs4_schedule_lease_recovery(clp); 5742 return; 5743 } 5744 nfs4_schedule_path_down_recovery(clp); 5745 } 5746 do_renew_lease(clp, timestamp); 5747 } 5748 5749 static const struct rpc_call_ops nfs4_renew_ops = { 5750 .rpc_call_done = nfs4_renew_done, 5751 .rpc_release = nfs4_renew_release, 5752 }; 5753 5754 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5755 { 5756 struct rpc_message msg = { 5757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5758 .rpc_argp = clp, 5759 .rpc_cred = cred, 5760 }; 5761 struct nfs4_renewdata *data; 5762 5763 if (renew_flags == 0) 5764 return 0; 5765 if (!refcount_inc_not_zero(&clp->cl_count)) 5766 return -EIO; 5767 data = kmalloc(sizeof(*data), GFP_NOFS); 5768 if (data == NULL) { 5769 nfs_put_client(clp); 5770 return -ENOMEM; 5771 } 5772 data->client = clp; 5773 data->timestamp = jiffies; 5774 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5775 &nfs4_renew_ops, data); 5776 } 5777 5778 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5779 { 5780 struct rpc_message msg = { 5781 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5782 .rpc_argp = clp, 5783 .rpc_cred = cred, 5784 }; 5785 unsigned long now = jiffies; 5786 int status; 5787 5788 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5789 if (status < 0) 5790 return status; 5791 do_renew_lease(clp, now); 5792 return 0; 5793 } 5794 5795 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5796 enum nfs4_acl_type type) 5797 { 5798 switch (type) { 5799 default: 5800 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5801 case NFS4ACL_DACL: 5802 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5803 case NFS4ACL_SACL: 5804 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5805 } 5806 } 5807 5808 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5809 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5810 * the stack. 5811 */ 5812 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5813 5814 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5815 struct page **pages) 5816 { 5817 struct page *newpage, **spages; 5818 int rc = 0; 5819 size_t len; 5820 spages = pages; 5821 5822 do { 5823 len = min_t(size_t, PAGE_SIZE, buflen); 5824 newpage = alloc_page(GFP_KERNEL); 5825 5826 if (newpage == NULL) 5827 goto unwind; 5828 memcpy(page_address(newpage), buf, len); 5829 buf += len; 5830 buflen -= len; 5831 *pages++ = newpage; 5832 rc++; 5833 } while (buflen != 0); 5834 5835 return rc; 5836 5837 unwind: 5838 for(; rc > 0; rc--) 5839 __free_page(spages[rc-1]); 5840 return -ENOMEM; 5841 } 5842 5843 struct nfs4_cached_acl { 5844 enum nfs4_acl_type type; 5845 int cached; 5846 size_t len; 5847 char data[]; 5848 }; 5849 5850 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5851 { 5852 struct nfs_inode *nfsi = NFS_I(inode); 5853 5854 spin_lock(&inode->i_lock); 5855 kfree(nfsi->nfs4_acl); 5856 nfsi->nfs4_acl = acl; 5857 spin_unlock(&inode->i_lock); 5858 } 5859 5860 static void nfs4_zap_acl_attr(struct inode *inode) 5861 { 5862 nfs4_set_cached_acl(inode, NULL); 5863 } 5864 5865 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5866 size_t buflen, enum nfs4_acl_type type) 5867 { 5868 struct nfs_inode *nfsi = NFS_I(inode); 5869 struct nfs4_cached_acl *acl; 5870 int ret = -ENOENT; 5871 5872 spin_lock(&inode->i_lock); 5873 acl = nfsi->nfs4_acl; 5874 if (acl == NULL) 5875 goto out; 5876 if (acl->type != type) 5877 goto out; 5878 if (buf == NULL) /* user is just asking for length */ 5879 goto out_len; 5880 if (acl->cached == 0) 5881 goto out; 5882 ret = -ERANGE; /* see getxattr(2) man page */ 5883 if (acl->len > buflen) 5884 goto out; 5885 memcpy(buf, acl->data, acl->len); 5886 out_len: 5887 ret = acl->len; 5888 out: 5889 spin_unlock(&inode->i_lock); 5890 return ret; 5891 } 5892 5893 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5894 size_t pgbase, size_t acl_len, 5895 enum nfs4_acl_type type) 5896 { 5897 struct nfs4_cached_acl *acl; 5898 size_t buflen = sizeof(*acl) + acl_len; 5899 5900 if (buflen <= PAGE_SIZE) { 5901 acl = kmalloc(buflen, GFP_KERNEL); 5902 if (acl == NULL) 5903 goto out; 5904 acl->cached = 1; 5905 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5906 } else { 5907 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5908 if (acl == NULL) 5909 goto out; 5910 acl->cached = 0; 5911 } 5912 acl->type = type; 5913 acl->len = acl_len; 5914 out: 5915 nfs4_set_cached_acl(inode, acl); 5916 } 5917 5918 /* 5919 * The getxattr API returns the required buffer length when called with a 5920 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5921 * the required buf. On a NULL buf, we send a page of data to the server 5922 * guessing that the ACL request can be serviced by a page. If so, we cache 5923 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5924 * the cache. If not so, we throw away the page, and cache the required 5925 * length. The next getxattr call will then produce another round trip to 5926 * the server, this time with the input buf of the required size. 5927 */ 5928 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5929 size_t buflen, enum nfs4_acl_type type) 5930 { 5931 struct page **pages; 5932 struct nfs_getaclargs args = { 5933 .fh = NFS_FH(inode), 5934 .acl_type = type, 5935 .acl_len = buflen, 5936 }; 5937 struct nfs_getaclres res = { 5938 .acl_type = type, 5939 .acl_len = buflen, 5940 }; 5941 struct rpc_message msg = { 5942 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5943 .rpc_argp = &args, 5944 .rpc_resp = &res, 5945 }; 5946 unsigned int npages; 5947 int ret = -ENOMEM, i; 5948 struct nfs_server *server = NFS_SERVER(inode); 5949 5950 if (buflen == 0) 5951 buflen = server->rsize; 5952 5953 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5954 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5955 if (!pages) 5956 return -ENOMEM; 5957 5958 args.acl_pages = pages; 5959 5960 for (i = 0; i < npages; i++) { 5961 pages[i] = alloc_page(GFP_KERNEL); 5962 if (!pages[i]) 5963 goto out_free; 5964 } 5965 5966 /* for decoding across pages */ 5967 res.acl_scratch = alloc_page(GFP_KERNEL); 5968 if (!res.acl_scratch) 5969 goto out_free; 5970 5971 args.acl_len = npages * PAGE_SIZE; 5972 5973 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5974 __func__, buf, buflen, npages, args.acl_len); 5975 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5976 &msg, &args.seq_args, &res.seq_res, 0); 5977 if (ret) 5978 goto out_free; 5979 5980 /* Handle the case where the passed-in buffer is too short */ 5981 if (res.acl_flags & NFS4_ACL_TRUNC) { 5982 /* Did the user only issue a request for the acl length? */ 5983 if (buf == NULL) 5984 goto out_ok; 5985 ret = -ERANGE; 5986 goto out_free; 5987 } 5988 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5989 type); 5990 if (buf) { 5991 if (res.acl_len > buflen) { 5992 ret = -ERANGE; 5993 goto out_free; 5994 } 5995 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5996 } 5997 out_ok: 5998 ret = res.acl_len; 5999 out_free: 6000 while (--i >= 0) 6001 __free_page(pages[i]); 6002 if (res.acl_scratch) 6003 __free_page(res.acl_scratch); 6004 kfree(pages); 6005 return ret; 6006 } 6007 6008 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6009 size_t buflen, enum nfs4_acl_type type) 6010 { 6011 struct nfs4_exception exception = { 6012 .interruptible = true, 6013 }; 6014 ssize_t ret; 6015 do { 6016 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6017 trace_nfs4_get_acl(inode, ret); 6018 if (ret >= 0) 6019 break; 6020 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6021 } while (exception.retry); 6022 return ret; 6023 } 6024 6025 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6026 enum nfs4_acl_type type) 6027 { 6028 struct nfs_server *server = NFS_SERVER(inode); 6029 int ret; 6030 6031 if (!nfs4_server_supports_acls(server, type)) 6032 return -EOPNOTSUPP; 6033 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6034 if (ret < 0) 6035 return ret; 6036 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6037 nfs_zap_acl_cache(inode); 6038 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6039 if (ret != -ENOENT) 6040 /* -ENOENT is returned if there is no ACL or if there is an ACL 6041 * but no cached acl data, just the acl length */ 6042 return ret; 6043 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6044 } 6045 6046 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6047 size_t buflen, enum nfs4_acl_type type) 6048 { 6049 struct nfs_server *server = NFS_SERVER(inode); 6050 struct page *pages[NFS4ACL_MAXPAGES]; 6051 struct nfs_setaclargs arg = { 6052 .fh = NFS_FH(inode), 6053 .acl_type = type, 6054 .acl_len = buflen, 6055 .acl_pages = pages, 6056 }; 6057 struct nfs_setaclres res; 6058 struct rpc_message msg = { 6059 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6060 .rpc_argp = &arg, 6061 .rpc_resp = &res, 6062 }; 6063 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6064 int ret, i; 6065 6066 /* You can't remove system.nfs4_acl: */ 6067 if (buflen == 0) 6068 return -EINVAL; 6069 if (!nfs4_server_supports_acls(server, type)) 6070 return -EOPNOTSUPP; 6071 if (npages > ARRAY_SIZE(pages)) 6072 return -ERANGE; 6073 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6074 if (i < 0) 6075 return i; 6076 nfs4_inode_make_writeable(inode); 6077 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6078 6079 /* 6080 * Free each page after tx, so the only ref left is 6081 * held by the network stack 6082 */ 6083 for (; i > 0; i--) 6084 put_page(pages[i-1]); 6085 6086 /* 6087 * Acl update can result in inode attribute update. 6088 * so mark the attribute cache invalid. 6089 */ 6090 spin_lock(&inode->i_lock); 6091 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6092 NFS_INO_INVALID_CTIME | 6093 NFS_INO_REVAL_FORCED); 6094 spin_unlock(&inode->i_lock); 6095 nfs_access_zap_cache(inode); 6096 nfs_zap_acl_cache(inode); 6097 return ret; 6098 } 6099 6100 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6101 size_t buflen, enum nfs4_acl_type type) 6102 { 6103 struct nfs4_exception exception = { }; 6104 int err; 6105 do { 6106 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6107 trace_nfs4_set_acl(inode, err); 6108 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6109 /* 6110 * no need to retry since the kernel 6111 * isn't involved in encoding the ACEs. 6112 */ 6113 err = -EINVAL; 6114 break; 6115 } 6116 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6117 &exception); 6118 } while (exception.retry); 6119 return err; 6120 } 6121 6122 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6123 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6124 size_t buflen) 6125 { 6126 struct nfs_server *server = NFS_SERVER(inode); 6127 struct nfs4_label label = {0, 0, buflen, buf}; 6128 6129 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6130 struct nfs_fattr fattr = { 6131 .label = &label, 6132 }; 6133 struct nfs4_getattr_arg arg = { 6134 .fh = NFS_FH(inode), 6135 .bitmask = bitmask, 6136 }; 6137 struct nfs4_getattr_res res = { 6138 .fattr = &fattr, 6139 .server = server, 6140 }; 6141 struct rpc_message msg = { 6142 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6143 .rpc_argp = &arg, 6144 .rpc_resp = &res, 6145 }; 6146 int ret; 6147 6148 nfs_fattr_init(&fattr); 6149 6150 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6151 if (ret) 6152 return ret; 6153 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6154 return -ENOENT; 6155 return label.len; 6156 } 6157 6158 static int nfs4_get_security_label(struct inode *inode, void *buf, 6159 size_t buflen) 6160 { 6161 struct nfs4_exception exception = { 6162 .interruptible = true, 6163 }; 6164 int err; 6165 6166 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6167 return -EOPNOTSUPP; 6168 6169 do { 6170 err = _nfs4_get_security_label(inode, buf, buflen); 6171 trace_nfs4_get_security_label(inode, err); 6172 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6173 &exception); 6174 } while (exception.retry); 6175 return err; 6176 } 6177 6178 static int _nfs4_do_set_security_label(struct inode *inode, 6179 struct nfs4_label *ilabel, 6180 struct nfs_fattr *fattr) 6181 { 6182 6183 struct iattr sattr = {0}; 6184 struct nfs_server *server = NFS_SERVER(inode); 6185 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6186 struct nfs_setattrargs arg = { 6187 .fh = NFS_FH(inode), 6188 .iap = &sattr, 6189 .server = server, 6190 .bitmask = bitmask, 6191 .label = ilabel, 6192 }; 6193 struct nfs_setattrres res = { 6194 .fattr = fattr, 6195 .server = server, 6196 }; 6197 struct rpc_message msg = { 6198 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6199 .rpc_argp = &arg, 6200 .rpc_resp = &res, 6201 }; 6202 int status; 6203 6204 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6205 6206 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6207 if (status) 6208 dprintk("%s failed: %d\n", __func__, status); 6209 6210 return status; 6211 } 6212 6213 static int nfs4_do_set_security_label(struct inode *inode, 6214 struct nfs4_label *ilabel, 6215 struct nfs_fattr *fattr) 6216 { 6217 struct nfs4_exception exception = { }; 6218 int err; 6219 6220 do { 6221 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6222 trace_nfs4_set_security_label(inode, err); 6223 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6224 &exception); 6225 } while (exception.retry); 6226 return err; 6227 } 6228 6229 static int 6230 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6231 { 6232 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6233 struct nfs_fattr *fattr; 6234 int status; 6235 6236 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6237 return -EOPNOTSUPP; 6238 6239 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6240 if (fattr == NULL) 6241 return -ENOMEM; 6242 6243 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6244 if (status == 0) 6245 nfs_setsecurity(inode, fattr); 6246 6247 return status; 6248 } 6249 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6250 6251 6252 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6253 nfs4_verifier *bootverf) 6254 { 6255 __be32 verf[2]; 6256 6257 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6258 /* An impossible timestamp guarantees this value 6259 * will never match a generated boot time. */ 6260 verf[0] = cpu_to_be32(U32_MAX); 6261 verf[1] = cpu_to_be32(U32_MAX); 6262 } else { 6263 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6264 u64 ns = ktime_to_ns(nn->boot_time); 6265 6266 verf[0] = cpu_to_be32(ns >> 32); 6267 verf[1] = cpu_to_be32(ns); 6268 } 6269 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6270 } 6271 6272 static size_t 6273 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6274 { 6275 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6276 struct nfs_netns_client *nn_clp = nn->nfs_client; 6277 const char *id; 6278 6279 buf[0] = '\0'; 6280 6281 if (nn_clp) { 6282 rcu_read_lock(); 6283 id = rcu_dereference(nn_clp->identifier); 6284 if (id) 6285 strscpy(buf, id, buflen); 6286 rcu_read_unlock(); 6287 } 6288 6289 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6290 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6291 6292 return strlen(buf); 6293 } 6294 6295 static int 6296 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6297 { 6298 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6299 size_t buflen; 6300 size_t len; 6301 char *str; 6302 6303 if (clp->cl_owner_id != NULL) 6304 return 0; 6305 6306 rcu_read_lock(); 6307 len = 14 + 6308 strlen(clp->cl_rpcclient->cl_nodename) + 6309 1 + 6310 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6311 1; 6312 rcu_read_unlock(); 6313 6314 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6315 if (buflen) 6316 len += buflen + 1; 6317 6318 if (len > NFS4_OPAQUE_LIMIT + 1) 6319 return -EINVAL; 6320 6321 /* 6322 * Since this string is allocated at mount time, and held until the 6323 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6324 * about a memory-reclaim deadlock. 6325 */ 6326 str = kmalloc(len, GFP_KERNEL); 6327 if (!str) 6328 return -ENOMEM; 6329 6330 rcu_read_lock(); 6331 if (buflen) 6332 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6333 clp->cl_rpcclient->cl_nodename, buf, 6334 rpc_peeraddr2str(clp->cl_rpcclient, 6335 RPC_DISPLAY_ADDR)); 6336 else 6337 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6338 clp->cl_rpcclient->cl_nodename, 6339 rpc_peeraddr2str(clp->cl_rpcclient, 6340 RPC_DISPLAY_ADDR)); 6341 rcu_read_unlock(); 6342 6343 clp->cl_owner_id = str; 6344 return 0; 6345 } 6346 6347 static int 6348 nfs4_init_uniform_client_string(struct nfs_client *clp) 6349 { 6350 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6351 size_t buflen; 6352 size_t len; 6353 char *str; 6354 6355 if (clp->cl_owner_id != NULL) 6356 return 0; 6357 6358 len = 10 + 10 + 1 + 10 + 1 + 6359 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6360 6361 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6362 if (buflen) 6363 len += buflen + 1; 6364 6365 if (len > NFS4_OPAQUE_LIMIT + 1) 6366 return -EINVAL; 6367 6368 /* 6369 * Since this string is allocated at mount time, and held until the 6370 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6371 * about a memory-reclaim deadlock. 6372 */ 6373 str = kmalloc(len, GFP_KERNEL); 6374 if (!str) 6375 return -ENOMEM; 6376 6377 if (buflen) 6378 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6379 clp->rpc_ops->version, clp->cl_minorversion, 6380 buf, clp->cl_rpcclient->cl_nodename); 6381 else 6382 scnprintf(str, len, "Linux NFSv%u.%u %s", 6383 clp->rpc_ops->version, clp->cl_minorversion, 6384 clp->cl_rpcclient->cl_nodename); 6385 clp->cl_owner_id = str; 6386 return 0; 6387 } 6388 6389 /* 6390 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6391 * services. Advertise one based on the address family of the 6392 * clientaddr. 6393 */ 6394 static unsigned int 6395 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6396 { 6397 if (strchr(clp->cl_ipaddr, ':') != NULL) 6398 return scnprintf(buf, len, "tcp6"); 6399 else 6400 return scnprintf(buf, len, "tcp"); 6401 } 6402 6403 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6404 { 6405 struct nfs4_setclientid *sc = calldata; 6406 6407 if (task->tk_status == 0) 6408 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6409 } 6410 6411 static const struct rpc_call_ops nfs4_setclientid_ops = { 6412 .rpc_call_done = nfs4_setclientid_done, 6413 }; 6414 6415 /** 6416 * nfs4_proc_setclientid - Negotiate client ID 6417 * @clp: state data structure 6418 * @program: RPC program for NFSv4 callback service 6419 * @port: IP port number for NFS4 callback service 6420 * @cred: credential to use for this call 6421 * @res: where to place the result 6422 * 6423 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6424 */ 6425 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6426 unsigned short port, const struct cred *cred, 6427 struct nfs4_setclientid_res *res) 6428 { 6429 nfs4_verifier sc_verifier; 6430 struct nfs4_setclientid setclientid = { 6431 .sc_verifier = &sc_verifier, 6432 .sc_prog = program, 6433 .sc_clnt = clp, 6434 }; 6435 struct rpc_message msg = { 6436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6437 .rpc_argp = &setclientid, 6438 .rpc_resp = res, 6439 .rpc_cred = cred, 6440 }; 6441 struct rpc_task_setup task_setup_data = { 6442 .rpc_client = clp->cl_rpcclient, 6443 .rpc_message = &msg, 6444 .callback_ops = &nfs4_setclientid_ops, 6445 .callback_data = &setclientid, 6446 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6447 }; 6448 unsigned long now = jiffies; 6449 int status; 6450 6451 /* nfs_client_id4 */ 6452 nfs4_init_boot_verifier(clp, &sc_verifier); 6453 6454 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6455 status = nfs4_init_uniform_client_string(clp); 6456 else 6457 status = nfs4_init_nonuniform_client_string(clp); 6458 6459 if (status) 6460 goto out; 6461 6462 /* cb_client4 */ 6463 setclientid.sc_netid_len = 6464 nfs4_init_callback_netid(clp, 6465 setclientid.sc_netid, 6466 sizeof(setclientid.sc_netid)); 6467 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6468 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6469 clp->cl_ipaddr, port >> 8, port & 255); 6470 6471 dprintk("NFS call setclientid auth=%s, '%s'\n", 6472 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6473 clp->cl_owner_id); 6474 6475 status = nfs4_call_sync_custom(&task_setup_data); 6476 if (setclientid.sc_cred) { 6477 kfree(clp->cl_acceptor); 6478 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6479 put_rpccred(setclientid.sc_cred); 6480 } 6481 6482 if (status == 0) 6483 do_renew_lease(clp, now); 6484 out: 6485 trace_nfs4_setclientid(clp, status); 6486 dprintk("NFS reply setclientid: %d\n", status); 6487 return status; 6488 } 6489 6490 /** 6491 * nfs4_proc_setclientid_confirm - Confirm client ID 6492 * @clp: state data structure 6493 * @arg: result of a previous SETCLIENTID 6494 * @cred: credential to use for this call 6495 * 6496 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6497 */ 6498 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6499 struct nfs4_setclientid_res *arg, 6500 const struct cred *cred) 6501 { 6502 struct rpc_message msg = { 6503 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6504 .rpc_argp = arg, 6505 .rpc_cred = cred, 6506 }; 6507 int status; 6508 6509 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6510 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6511 clp->cl_clientid); 6512 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6513 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6514 trace_nfs4_setclientid_confirm(clp, status); 6515 dprintk("NFS reply setclientid_confirm: %d\n", status); 6516 return status; 6517 } 6518 6519 struct nfs4_delegreturndata { 6520 struct nfs4_delegreturnargs args; 6521 struct nfs4_delegreturnres res; 6522 struct nfs_fh fh; 6523 nfs4_stateid stateid; 6524 unsigned long timestamp; 6525 struct { 6526 struct nfs4_layoutreturn_args arg; 6527 struct nfs4_layoutreturn_res res; 6528 struct nfs4_xdr_opaque_data ld_private; 6529 u32 roc_barrier; 6530 bool roc; 6531 } lr; 6532 struct nfs_fattr fattr; 6533 int rpc_status; 6534 struct inode *inode; 6535 }; 6536 6537 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6538 { 6539 struct nfs4_delegreturndata *data = calldata; 6540 struct nfs4_exception exception = { 6541 .inode = data->inode, 6542 .stateid = &data->stateid, 6543 .task_is_privileged = data->args.seq_args.sa_privileged, 6544 }; 6545 6546 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6547 return; 6548 6549 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6550 6551 /* Handle Layoutreturn errors */ 6552 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6553 &data->res.lr_ret) == -EAGAIN) 6554 goto out_restart; 6555 6556 switch (task->tk_status) { 6557 case 0: 6558 renew_lease(data->res.server, data->timestamp); 6559 break; 6560 case -NFS4ERR_ADMIN_REVOKED: 6561 case -NFS4ERR_DELEG_REVOKED: 6562 case -NFS4ERR_EXPIRED: 6563 nfs4_free_revoked_stateid(data->res.server, 6564 data->args.stateid, 6565 task->tk_msg.rpc_cred); 6566 fallthrough; 6567 case -NFS4ERR_BAD_STATEID: 6568 case -NFS4ERR_STALE_STATEID: 6569 case -ETIMEDOUT: 6570 task->tk_status = 0; 6571 break; 6572 case -NFS4ERR_OLD_STATEID: 6573 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6574 nfs4_stateid_seqid_inc(&data->stateid); 6575 if (data->args.bitmask) { 6576 data->args.bitmask = NULL; 6577 data->res.fattr = NULL; 6578 } 6579 goto out_restart; 6580 case -NFS4ERR_ACCESS: 6581 if (data->args.bitmask) { 6582 data->args.bitmask = NULL; 6583 data->res.fattr = NULL; 6584 goto out_restart; 6585 } 6586 fallthrough; 6587 default: 6588 task->tk_status = nfs4_async_handle_exception(task, 6589 data->res.server, task->tk_status, 6590 &exception); 6591 if (exception.retry) 6592 goto out_restart; 6593 } 6594 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6595 data->rpc_status = task->tk_status; 6596 return; 6597 out_restart: 6598 task->tk_status = 0; 6599 rpc_restart_call_prepare(task); 6600 } 6601 6602 static void nfs4_delegreturn_release(void *calldata) 6603 { 6604 struct nfs4_delegreturndata *data = calldata; 6605 struct inode *inode = data->inode; 6606 6607 if (data->lr.roc) 6608 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6609 data->res.lr_ret); 6610 if (inode) { 6611 nfs4_fattr_set_prechange(&data->fattr, 6612 inode_peek_iversion_raw(inode)); 6613 nfs_refresh_inode(inode, &data->fattr); 6614 nfs_iput_and_deactive(inode); 6615 } 6616 kfree(calldata); 6617 } 6618 6619 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6620 { 6621 struct nfs4_delegreturndata *d_data; 6622 struct pnfs_layout_hdr *lo; 6623 6624 d_data = data; 6625 6626 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6627 nfs4_sequence_done(task, &d_data->res.seq_res); 6628 return; 6629 } 6630 6631 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6632 if (lo && !pnfs_layout_is_valid(lo)) { 6633 d_data->args.lr_args = NULL; 6634 d_data->res.lr_res = NULL; 6635 } 6636 6637 nfs4_setup_sequence(d_data->res.server->nfs_client, 6638 &d_data->args.seq_args, 6639 &d_data->res.seq_res, 6640 task); 6641 } 6642 6643 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6644 .rpc_call_prepare = nfs4_delegreturn_prepare, 6645 .rpc_call_done = nfs4_delegreturn_done, 6646 .rpc_release = nfs4_delegreturn_release, 6647 }; 6648 6649 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6650 { 6651 struct nfs4_delegreturndata *data; 6652 struct nfs_server *server = NFS_SERVER(inode); 6653 struct rpc_task *task; 6654 struct rpc_message msg = { 6655 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6656 .rpc_cred = cred, 6657 }; 6658 struct rpc_task_setup task_setup_data = { 6659 .rpc_client = server->client, 6660 .rpc_message = &msg, 6661 .callback_ops = &nfs4_delegreturn_ops, 6662 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6663 }; 6664 int status = 0; 6665 6666 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6667 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6668 6669 data = kzalloc(sizeof(*data), GFP_KERNEL); 6670 if (data == NULL) 6671 return -ENOMEM; 6672 6673 nfs4_state_protect(server->nfs_client, 6674 NFS_SP4_MACH_CRED_CLEANUP, 6675 &task_setup_data.rpc_client, &msg); 6676 6677 data->args.fhandle = &data->fh; 6678 data->args.stateid = &data->stateid; 6679 nfs4_bitmask_set(data->args.bitmask_store, 6680 server->cache_consistency_bitmask, inode, 0); 6681 data->args.bitmask = data->args.bitmask_store; 6682 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6683 nfs4_stateid_copy(&data->stateid, stateid); 6684 data->res.fattr = &data->fattr; 6685 data->res.server = server; 6686 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6687 data->lr.arg.ld_private = &data->lr.ld_private; 6688 nfs_fattr_init(data->res.fattr); 6689 data->timestamp = jiffies; 6690 data->rpc_status = 0; 6691 data->inode = nfs_igrab_and_active(inode); 6692 if (data->inode || issync) { 6693 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6694 cred); 6695 if (data->lr.roc) { 6696 data->args.lr_args = &data->lr.arg; 6697 data->res.lr_res = &data->lr.res; 6698 } 6699 } 6700 6701 if (!data->inode) 6702 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6703 1); 6704 else 6705 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6706 0); 6707 task_setup_data.callback_data = data; 6708 msg.rpc_argp = &data->args; 6709 msg.rpc_resp = &data->res; 6710 task = rpc_run_task(&task_setup_data); 6711 if (IS_ERR(task)) 6712 return PTR_ERR(task); 6713 if (!issync) 6714 goto out; 6715 status = rpc_wait_for_completion_task(task); 6716 if (status != 0) 6717 goto out; 6718 status = data->rpc_status; 6719 out: 6720 rpc_put_task(task); 6721 return status; 6722 } 6723 6724 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6725 { 6726 struct nfs_server *server = NFS_SERVER(inode); 6727 struct nfs4_exception exception = { }; 6728 int err; 6729 do { 6730 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6731 trace_nfs4_delegreturn(inode, stateid, err); 6732 switch (err) { 6733 case -NFS4ERR_STALE_STATEID: 6734 case -NFS4ERR_EXPIRED: 6735 case 0: 6736 return 0; 6737 } 6738 err = nfs4_handle_exception(server, err, &exception); 6739 } while (exception.retry); 6740 return err; 6741 } 6742 6743 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6744 { 6745 struct inode *inode = state->inode; 6746 struct nfs_server *server = NFS_SERVER(inode); 6747 struct nfs_client *clp = server->nfs_client; 6748 struct nfs_lockt_args arg = { 6749 .fh = NFS_FH(inode), 6750 .fl = request, 6751 }; 6752 struct nfs_lockt_res res = { 6753 .denied = request, 6754 }; 6755 struct rpc_message msg = { 6756 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6757 .rpc_argp = &arg, 6758 .rpc_resp = &res, 6759 .rpc_cred = state->owner->so_cred, 6760 }; 6761 struct nfs4_lock_state *lsp; 6762 int status; 6763 6764 arg.lock_owner.clientid = clp->cl_clientid; 6765 status = nfs4_set_lock_state(state, request); 6766 if (status != 0) 6767 goto out; 6768 lsp = request->fl_u.nfs4_fl.owner; 6769 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6770 arg.lock_owner.s_dev = server->s_dev; 6771 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6772 switch (status) { 6773 case 0: 6774 request->fl_type = F_UNLCK; 6775 break; 6776 case -NFS4ERR_DENIED: 6777 status = 0; 6778 } 6779 request->fl_ops->fl_release_private(request); 6780 request->fl_ops = NULL; 6781 out: 6782 return status; 6783 } 6784 6785 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6786 { 6787 struct nfs4_exception exception = { 6788 .interruptible = true, 6789 }; 6790 int err; 6791 6792 do { 6793 err = _nfs4_proc_getlk(state, cmd, request); 6794 trace_nfs4_get_lock(request, state, cmd, err); 6795 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6796 &exception); 6797 } while (exception.retry); 6798 return err; 6799 } 6800 6801 /* 6802 * Update the seqid of a lock stateid after receiving 6803 * NFS4ERR_OLD_STATEID 6804 */ 6805 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6806 struct nfs4_lock_state *lsp) 6807 { 6808 struct nfs4_state *state = lsp->ls_state; 6809 bool ret = false; 6810 6811 spin_lock(&state->state_lock); 6812 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6813 goto out; 6814 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6815 nfs4_stateid_seqid_inc(dst); 6816 else 6817 dst->seqid = lsp->ls_stateid.seqid; 6818 ret = true; 6819 out: 6820 spin_unlock(&state->state_lock); 6821 return ret; 6822 } 6823 6824 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6825 struct nfs4_lock_state *lsp) 6826 { 6827 struct nfs4_state *state = lsp->ls_state; 6828 bool ret; 6829 6830 spin_lock(&state->state_lock); 6831 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6832 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6833 spin_unlock(&state->state_lock); 6834 return ret; 6835 } 6836 6837 struct nfs4_unlockdata { 6838 struct nfs_locku_args arg; 6839 struct nfs_locku_res res; 6840 struct nfs4_lock_state *lsp; 6841 struct nfs_open_context *ctx; 6842 struct nfs_lock_context *l_ctx; 6843 struct file_lock fl; 6844 struct nfs_server *server; 6845 unsigned long timestamp; 6846 }; 6847 6848 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6849 struct nfs_open_context *ctx, 6850 struct nfs4_lock_state *lsp, 6851 struct nfs_seqid *seqid) 6852 { 6853 struct nfs4_unlockdata *p; 6854 struct nfs4_state *state = lsp->ls_state; 6855 struct inode *inode = state->inode; 6856 6857 p = kzalloc(sizeof(*p), GFP_KERNEL); 6858 if (p == NULL) 6859 return NULL; 6860 p->arg.fh = NFS_FH(inode); 6861 p->arg.fl = &p->fl; 6862 p->arg.seqid = seqid; 6863 p->res.seqid = seqid; 6864 p->lsp = lsp; 6865 /* Ensure we don't close file until we're done freeing locks! */ 6866 p->ctx = get_nfs_open_context(ctx); 6867 p->l_ctx = nfs_get_lock_context(ctx); 6868 locks_init_lock(&p->fl); 6869 locks_copy_lock(&p->fl, fl); 6870 p->server = NFS_SERVER(inode); 6871 spin_lock(&state->state_lock); 6872 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6873 spin_unlock(&state->state_lock); 6874 return p; 6875 } 6876 6877 static void nfs4_locku_release_calldata(void *data) 6878 { 6879 struct nfs4_unlockdata *calldata = data; 6880 nfs_free_seqid(calldata->arg.seqid); 6881 nfs4_put_lock_state(calldata->lsp); 6882 nfs_put_lock_context(calldata->l_ctx); 6883 put_nfs_open_context(calldata->ctx); 6884 kfree(calldata); 6885 } 6886 6887 static void nfs4_locku_done(struct rpc_task *task, void *data) 6888 { 6889 struct nfs4_unlockdata *calldata = data; 6890 struct nfs4_exception exception = { 6891 .inode = calldata->lsp->ls_state->inode, 6892 .stateid = &calldata->arg.stateid, 6893 }; 6894 6895 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6896 return; 6897 switch (task->tk_status) { 6898 case 0: 6899 renew_lease(calldata->server, calldata->timestamp); 6900 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6901 if (nfs4_update_lock_stateid(calldata->lsp, 6902 &calldata->res.stateid)) 6903 break; 6904 fallthrough; 6905 case -NFS4ERR_ADMIN_REVOKED: 6906 case -NFS4ERR_EXPIRED: 6907 nfs4_free_revoked_stateid(calldata->server, 6908 &calldata->arg.stateid, 6909 task->tk_msg.rpc_cred); 6910 fallthrough; 6911 case -NFS4ERR_BAD_STATEID: 6912 case -NFS4ERR_STALE_STATEID: 6913 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6914 calldata->lsp)) 6915 rpc_restart_call_prepare(task); 6916 break; 6917 case -NFS4ERR_OLD_STATEID: 6918 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6919 calldata->lsp)) 6920 rpc_restart_call_prepare(task); 6921 break; 6922 default: 6923 task->tk_status = nfs4_async_handle_exception(task, 6924 calldata->server, task->tk_status, 6925 &exception); 6926 if (exception.retry) 6927 rpc_restart_call_prepare(task); 6928 } 6929 nfs_release_seqid(calldata->arg.seqid); 6930 } 6931 6932 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6933 { 6934 struct nfs4_unlockdata *calldata = data; 6935 6936 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6937 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6938 return; 6939 6940 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6941 goto out_wait; 6942 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6943 /* Note: exit _without_ running nfs4_locku_done */ 6944 goto out_no_action; 6945 } 6946 calldata->timestamp = jiffies; 6947 if (nfs4_setup_sequence(calldata->server->nfs_client, 6948 &calldata->arg.seq_args, 6949 &calldata->res.seq_res, 6950 task) != 0) 6951 nfs_release_seqid(calldata->arg.seqid); 6952 return; 6953 out_no_action: 6954 task->tk_action = NULL; 6955 out_wait: 6956 nfs4_sequence_done(task, &calldata->res.seq_res); 6957 } 6958 6959 static const struct rpc_call_ops nfs4_locku_ops = { 6960 .rpc_call_prepare = nfs4_locku_prepare, 6961 .rpc_call_done = nfs4_locku_done, 6962 .rpc_release = nfs4_locku_release_calldata, 6963 }; 6964 6965 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6966 struct nfs_open_context *ctx, 6967 struct nfs4_lock_state *lsp, 6968 struct nfs_seqid *seqid) 6969 { 6970 struct nfs4_unlockdata *data; 6971 struct rpc_message msg = { 6972 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6973 .rpc_cred = ctx->cred, 6974 }; 6975 struct rpc_task_setup task_setup_data = { 6976 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6977 .rpc_message = &msg, 6978 .callback_ops = &nfs4_locku_ops, 6979 .workqueue = nfsiod_workqueue, 6980 .flags = RPC_TASK_ASYNC, 6981 }; 6982 6983 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6984 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6985 6986 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6987 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6988 6989 /* Ensure this is an unlock - when canceling a lock, the 6990 * canceled lock is passed in, and it won't be an unlock. 6991 */ 6992 fl->fl_type = F_UNLCK; 6993 if (fl->fl_flags & FL_CLOSE) 6994 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6995 6996 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6997 if (data == NULL) { 6998 nfs_free_seqid(seqid); 6999 return ERR_PTR(-ENOMEM); 7000 } 7001 7002 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7003 msg.rpc_argp = &data->arg; 7004 msg.rpc_resp = &data->res; 7005 task_setup_data.callback_data = data; 7006 return rpc_run_task(&task_setup_data); 7007 } 7008 7009 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7010 { 7011 struct inode *inode = state->inode; 7012 struct nfs4_state_owner *sp = state->owner; 7013 struct nfs_inode *nfsi = NFS_I(inode); 7014 struct nfs_seqid *seqid; 7015 struct nfs4_lock_state *lsp; 7016 struct rpc_task *task; 7017 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7018 int status = 0; 7019 unsigned char fl_flags = request->fl_flags; 7020 7021 status = nfs4_set_lock_state(state, request); 7022 /* Unlock _before_ we do the RPC call */ 7023 request->fl_flags |= FL_EXISTS; 7024 /* Exclude nfs_delegation_claim_locks() */ 7025 mutex_lock(&sp->so_delegreturn_mutex); 7026 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7027 down_read(&nfsi->rwsem); 7028 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7029 up_read(&nfsi->rwsem); 7030 mutex_unlock(&sp->so_delegreturn_mutex); 7031 goto out; 7032 } 7033 lsp = request->fl_u.nfs4_fl.owner; 7034 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7035 up_read(&nfsi->rwsem); 7036 mutex_unlock(&sp->so_delegreturn_mutex); 7037 if (status != 0) 7038 goto out; 7039 /* Is this a delegated lock? */ 7040 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7041 goto out; 7042 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7043 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7044 status = -ENOMEM; 7045 if (IS_ERR(seqid)) 7046 goto out; 7047 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7048 status = PTR_ERR(task); 7049 if (IS_ERR(task)) 7050 goto out; 7051 status = rpc_wait_for_completion_task(task); 7052 rpc_put_task(task); 7053 out: 7054 request->fl_flags = fl_flags; 7055 trace_nfs4_unlock(request, state, F_SETLK, status); 7056 return status; 7057 } 7058 7059 struct nfs4_lockdata { 7060 struct nfs_lock_args arg; 7061 struct nfs_lock_res res; 7062 struct nfs4_lock_state *lsp; 7063 struct nfs_open_context *ctx; 7064 struct file_lock fl; 7065 unsigned long timestamp; 7066 int rpc_status; 7067 int cancelled; 7068 struct nfs_server *server; 7069 }; 7070 7071 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7072 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7073 gfp_t gfp_mask) 7074 { 7075 struct nfs4_lockdata *p; 7076 struct inode *inode = lsp->ls_state->inode; 7077 struct nfs_server *server = NFS_SERVER(inode); 7078 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7079 7080 p = kzalloc(sizeof(*p), gfp_mask); 7081 if (p == NULL) 7082 return NULL; 7083 7084 p->arg.fh = NFS_FH(inode); 7085 p->arg.fl = &p->fl; 7086 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7087 if (IS_ERR(p->arg.open_seqid)) 7088 goto out_free; 7089 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7090 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7091 if (IS_ERR(p->arg.lock_seqid)) 7092 goto out_free_seqid; 7093 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7094 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7095 p->arg.lock_owner.s_dev = server->s_dev; 7096 p->res.lock_seqid = p->arg.lock_seqid; 7097 p->lsp = lsp; 7098 p->server = server; 7099 p->ctx = get_nfs_open_context(ctx); 7100 locks_init_lock(&p->fl); 7101 locks_copy_lock(&p->fl, fl); 7102 return p; 7103 out_free_seqid: 7104 nfs_free_seqid(p->arg.open_seqid); 7105 out_free: 7106 kfree(p); 7107 return NULL; 7108 } 7109 7110 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7111 { 7112 struct nfs4_lockdata *data = calldata; 7113 struct nfs4_state *state = data->lsp->ls_state; 7114 7115 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7116 goto out_wait; 7117 /* Do we need to do an open_to_lock_owner? */ 7118 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7119 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7120 goto out_release_lock_seqid; 7121 } 7122 nfs4_stateid_copy(&data->arg.open_stateid, 7123 &state->open_stateid); 7124 data->arg.new_lock_owner = 1; 7125 data->res.open_seqid = data->arg.open_seqid; 7126 } else { 7127 data->arg.new_lock_owner = 0; 7128 nfs4_stateid_copy(&data->arg.lock_stateid, 7129 &data->lsp->ls_stateid); 7130 } 7131 if (!nfs4_valid_open_stateid(state)) { 7132 data->rpc_status = -EBADF; 7133 task->tk_action = NULL; 7134 goto out_release_open_seqid; 7135 } 7136 data->timestamp = jiffies; 7137 if (nfs4_setup_sequence(data->server->nfs_client, 7138 &data->arg.seq_args, 7139 &data->res.seq_res, 7140 task) == 0) 7141 return; 7142 out_release_open_seqid: 7143 nfs_release_seqid(data->arg.open_seqid); 7144 out_release_lock_seqid: 7145 nfs_release_seqid(data->arg.lock_seqid); 7146 out_wait: 7147 nfs4_sequence_done(task, &data->res.seq_res); 7148 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7149 } 7150 7151 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7152 { 7153 struct nfs4_lockdata *data = calldata; 7154 struct nfs4_lock_state *lsp = data->lsp; 7155 7156 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7157 return; 7158 7159 data->rpc_status = task->tk_status; 7160 switch (task->tk_status) { 7161 case 0: 7162 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7163 data->timestamp); 7164 if (data->arg.new_lock && !data->cancelled) { 7165 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7166 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7167 goto out_restart; 7168 } 7169 if (data->arg.new_lock_owner != 0) { 7170 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7171 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7172 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7173 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7174 goto out_restart; 7175 break; 7176 case -NFS4ERR_OLD_STATEID: 7177 if (data->arg.new_lock_owner != 0 && 7178 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7179 lsp->ls_state)) 7180 goto out_restart; 7181 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7182 goto out_restart; 7183 fallthrough; 7184 case -NFS4ERR_BAD_STATEID: 7185 case -NFS4ERR_STALE_STATEID: 7186 case -NFS4ERR_EXPIRED: 7187 if (data->arg.new_lock_owner != 0) { 7188 if (!nfs4_stateid_match(&data->arg.open_stateid, 7189 &lsp->ls_state->open_stateid)) 7190 goto out_restart; 7191 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7192 &lsp->ls_stateid)) 7193 goto out_restart; 7194 } 7195 out_done: 7196 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7197 return; 7198 out_restart: 7199 if (!data->cancelled) 7200 rpc_restart_call_prepare(task); 7201 goto out_done; 7202 } 7203 7204 static void nfs4_lock_release(void *calldata) 7205 { 7206 struct nfs4_lockdata *data = calldata; 7207 7208 nfs_free_seqid(data->arg.open_seqid); 7209 if (data->cancelled && data->rpc_status == 0) { 7210 struct rpc_task *task; 7211 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7212 data->arg.lock_seqid); 7213 if (!IS_ERR(task)) 7214 rpc_put_task_async(task); 7215 dprintk("%s: cancelling lock!\n", __func__); 7216 } else 7217 nfs_free_seqid(data->arg.lock_seqid); 7218 nfs4_put_lock_state(data->lsp); 7219 put_nfs_open_context(data->ctx); 7220 kfree(data); 7221 } 7222 7223 static const struct rpc_call_ops nfs4_lock_ops = { 7224 .rpc_call_prepare = nfs4_lock_prepare, 7225 .rpc_call_done = nfs4_lock_done, 7226 .rpc_release = nfs4_lock_release, 7227 }; 7228 7229 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7230 { 7231 switch (error) { 7232 case -NFS4ERR_ADMIN_REVOKED: 7233 case -NFS4ERR_EXPIRED: 7234 case -NFS4ERR_BAD_STATEID: 7235 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7236 if (new_lock_owner != 0 || 7237 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7238 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7239 break; 7240 case -NFS4ERR_STALE_STATEID: 7241 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7242 nfs4_schedule_lease_recovery(server->nfs_client); 7243 } 7244 } 7245 7246 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7247 { 7248 struct nfs4_lockdata *data; 7249 struct rpc_task *task; 7250 struct rpc_message msg = { 7251 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7252 .rpc_cred = state->owner->so_cred, 7253 }; 7254 struct rpc_task_setup task_setup_data = { 7255 .rpc_client = NFS_CLIENT(state->inode), 7256 .rpc_message = &msg, 7257 .callback_ops = &nfs4_lock_ops, 7258 .workqueue = nfsiod_workqueue, 7259 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7260 }; 7261 int ret; 7262 7263 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7264 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7265 7266 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7267 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7268 if (data == NULL) 7269 return -ENOMEM; 7270 if (IS_SETLKW(cmd)) 7271 data->arg.block = 1; 7272 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7273 recovery_type > NFS_LOCK_NEW); 7274 msg.rpc_argp = &data->arg; 7275 msg.rpc_resp = &data->res; 7276 task_setup_data.callback_data = data; 7277 if (recovery_type > NFS_LOCK_NEW) { 7278 if (recovery_type == NFS_LOCK_RECLAIM) 7279 data->arg.reclaim = NFS_LOCK_RECLAIM; 7280 } else 7281 data->arg.new_lock = 1; 7282 task = rpc_run_task(&task_setup_data); 7283 if (IS_ERR(task)) 7284 return PTR_ERR(task); 7285 ret = rpc_wait_for_completion_task(task); 7286 if (ret == 0) { 7287 ret = data->rpc_status; 7288 if (ret) 7289 nfs4_handle_setlk_error(data->server, data->lsp, 7290 data->arg.new_lock_owner, ret); 7291 } else 7292 data->cancelled = true; 7293 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7294 rpc_put_task(task); 7295 dprintk("%s: ret = %d\n", __func__, ret); 7296 return ret; 7297 } 7298 7299 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7300 { 7301 struct nfs_server *server = NFS_SERVER(state->inode); 7302 struct nfs4_exception exception = { 7303 .inode = state->inode, 7304 }; 7305 int err; 7306 7307 do { 7308 /* Cache the lock if possible... */ 7309 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7310 return 0; 7311 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7312 if (err != -NFS4ERR_DELAY) 7313 break; 7314 nfs4_handle_exception(server, err, &exception); 7315 } while (exception.retry); 7316 return err; 7317 } 7318 7319 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7320 { 7321 struct nfs_server *server = NFS_SERVER(state->inode); 7322 struct nfs4_exception exception = { 7323 .inode = state->inode, 7324 }; 7325 int err; 7326 7327 err = nfs4_set_lock_state(state, request); 7328 if (err != 0) 7329 return err; 7330 if (!recover_lost_locks) { 7331 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7332 return 0; 7333 } 7334 do { 7335 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7336 return 0; 7337 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7338 switch (err) { 7339 default: 7340 goto out; 7341 case -NFS4ERR_GRACE: 7342 case -NFS4ERR_DELAY: 7343 nfs4_handle_exception(server, err, &exception); 7344 err = 0; 7345 } 7346 } while (exception.retry); 7347 out: 7348 return err; 7349 } 7350 7351 #if defined(CONFIG_NFS_V4_1) 7352 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7353 { 7354 struct nfs4_lock_state *lsp; 7355 int status; 7356 7357 status = nfs4_set_lock_state(state, request); 7358 if (status != 0) 7359 return status; 7360 lsp = request->fl_u.nfs4_fl.owner; 7361 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7362 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7363 return 0; 7364 return nfs4_lock_expired(state, request); 7365 } 7366 #endif 7367 7368 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7369 { 7370 struct nfs_inode *nfsi = NFS_I(state->inode); 7371 struct nfs4_state_owner *sp = state->owner; 7372 unsigned char fl_flags = request->fl_flags; 7373 int status; 7374 7375 request->fl_flags |= FL_ACCESS; 7376 status = locks_lock_inode_wait(state->inode, request); 7377 if (status < 0) 7378 goto out; 7379 mutex_lock(&sp->so_delegreturn_mutex); 7380 down_read(&nfsi->rwsem); 7381 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7382 /* Yes: cache locks! */ 7383 /* ...but avoid races with delegation recall... */ 7384 request->fl_flags = fl_flags & ~FL_SLEEP; 7385 status = locks_lock_inode_wait(state->inode, request); 7386 up_read(&nfsi->rwsem); 7387 mutex_unlock(&sp->so_delegreturn_mutex); 7388 goto out; 7389 } 7390 up_read(&nfsi->rwsem); 7391 mutex_unlock(&sp->so_delegreturn_mutex); 7392 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7393 out: 7394 request->fl_flags = fl_flags; 7395 return status; 7396 } 7397 7398 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7399 { 7400 struct nfs4_exception exception = { 7401 .state = state, 7402 .inode = state->inode, 7403 .interruptible = true, 7404 }; 7405 int err; 7406 7407 do { 7408 err = _nfs4_proc_setlk(state, cmd, request); 7409 if (err == -NFS4ERR_DENIED) 7410 err = -EAGAIN; 7411 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7412 err, &exception); 7413 } while (exception.retry); 7414 return err; 7415 } 7416 7417 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7418 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7419 7420 static int 7421 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7422 struct file_lock *request) 7423 { 7424 int status = -ERESTARTSYS; 7425 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7426 7427 while(!signalled()) { 7428 status = nfs4_proc_setlk(state, cmd, request); 7429 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7430 break; 7431 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7432 schedule_timeout(timeout); 7433 timeout *= 2; 7434 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7435 status = -ERESTARTSYS; 7436 } 7437 return status; 7438 } 7439 7440 #ifdef CONFIG_NFS_V4_1 7441 struct nfs4_lock_waiter { 7442 struct inode *inode; 7443 struct nfs_lowner owner; 7444 wait_queue_entry_t wait; 7445 }; 7446 7447 static int 7448 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7449 { 7450 struct nfs4_lock_waiter *waiter = 7451 container_of(wait, struct nfs4_lock_waiter, wait); 7452 7453 /* NULL key means to wake up everyone */ 7454 if (key) { 7455 struct cb_notify_lock_args *cbnl = key; 7456 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7457 *wowner = &waiter->owner; 7458 7459 /* Only wake if the callback was for the same owner. */ 7460 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7461 return 0; 7462 7463 /* Make sure it's for the right inode */ 7464 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7465 return 0; 7466 } 7467 7468 return woken_wake_function(wait, mode, flags, key); 7469 } 7470 7471 static int 7472 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7473 { 7474 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7475 struct nfs_server *server = NFS_SERVER(state->inode); 7476 struct nfs_client *clp = server->nfs_client; 7477 wait_queue_head_t *q = &clp->cl_lock_waitq; 7478 struct nfs4_lock_waiter waiter = { 7479 .inode = state->inode, 7480 .owner = { .clientid = clp->cl_clientid, 7481 .id = lsp->ls_seqid.owner_id, 7482 .s_dev = server->s_dev }, 7483 }; 7484 int status; 7485 7486 /* Don't bother with waitqueue if we don't expect a callback */ 7487 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7488 return nfs4_retry_setlk_simple(state, cmd, request); 7489 7490 init_wait(&waiter.wait); 7491 waiter.wait.func = nfs4_wake_lock_waiter; 7492 add_wait_queue(q, &waiter.wait); 7493 7494 do { 7495 status = nfs4_proc_setlk(state, cmd, request); 7496 if (status != -EAGAIN || IS_SETLK(cmd)) 7497 break; 7498 7499 status = -ERESTARTSYS; 7500 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7501 NFS4_LOCK_MAXTIMEOUT); 7502 } while (!signalled()); 7503 7504 remove_wait_queue(q, &waiter.wait); 7505 7506 return status; 7507 } 7508 #else /* !CONFIG_NFS_V4_1 */ 7509 static inline int 7510 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7511 { 7512 return nfs4_retry_setlk_simple(state, cmd, request); 7513 } 7514 #endif 7515 7516 static int 7517 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7518 { 7519 struct nfs_open_context *ctx; 7520 struct nfs4_state *state; 7521 int status; 7522 7523 /* verify open state */ 7524 ctx = nfs_file_open_context(filp); 7525 state = ctx->state; 7526 7527 if (IS_GETLK(cmd)) { 7528 if (state != NULL) 7529 return nfs4_proc_getlk(state, F_GETLK, request); 7530 return 0; 7531 } 7532 7533 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7534 return -EINVAL; 7535 7536 if (request->fl_type == F_UNLCK) { 7537 if (state != NULL) 7538 return nfs4_proc_unlck(state, cmd, request); 7539 return 0; 7540 } 7541 7542 if (state == NULL) 7543 return -ENOLCK; 7544 7545 if ((request->fl_flags & FL_POSIX) && 7546 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7547 return -ENOLCK; 7548 7549 /* 7550 * Don't rely on the VFS having checked the file open mode, 7551 * since it won't do this for flock() locks. 7552 */ 7553 switch (request->fl_type) { 7554 case F_RDLCK: 7555 if (!(filp->f_mode & FMODE_READ)) 7556 return -EBADF; 7557 break; 7558 case F_WRLCK: 7559 if (!(filp->f_mode & FMODE_WRITE)) 7560 return -EBADF; 7561 } 7562 7563 status = nfs4_set_lock_state(state, request); 7564 if (status != 0) 7565 return status; 7566 7567 return nfs4_retry_setlk(state, cmd, request); 7568 } 7569 7570 static int nfs4_delete_lease(struct file *file, void **priv) 7571 { 7572 return generic_setlease(file, F_UNLCK, NULL, priv); 7573 } 7574 7575 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease, 7576 void **priv) 7577 { 7578 struct inode *inode = file_inode(file); 7579 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7580 int ret; 7581 7582 /* No delegation, no lease */ 7583 if (!nfs4_have_delegation(inode, type)) 7584 return -EAGAIN; 7585 ret = generic_setlease(file, arg, lease, priv); 7586 if (ret || nfs4_have_delegation(inode, type)) 7587 return ret; 7588 /* We raced with a delegation return */ 7589 nfs4_delete_lease(file, priv); 7590 return -EAGAIN; 7591 } 7592 7593 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease, 7594 void **priv) 7595 { 7596 switch (arg) { 7597 case F_RDLCK: 7598 case F_WRLCK: 7599 return nfs4_add_lease(file, arg, lease, priv); 7600 case F_UNLCK: 7601 return nfs4_delete_lease(file, priv); 7602 default: 7603 return -EINVAL; 7604 } 7605 } 7606 7607 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7608 { 7609 struct nfs_server *server = NFS_SERVER(state->inode); 7610 int err; 7611 7612 err = nfs4_set_lock_state(state, fl); 7613 if (err != 0) 7614 return err; 7615 do { 7616 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7617 if (err != -NFS4ERR_DELAY) 7618 break; 7619 ssleep(1); 7620 } while (err == -NFS4ERR_DELAY); 7621 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7622 } 7623 7624 struct nfs_release_lockowner_data { 7625 struct nfs4_lock_state *lsp; 7626 struct nfs_server *server; 7627 struct nfs_release_lockowner_args args; 7628 struct nfs_release_lockowner_res res; 7629 unsigned long timestamp; 7630 }; 7631 7632 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7633 { 7634 struct nfs_release_lockowner_data *data = calldata; 7635 struct nfs_server *server = data->server; 7636 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7637 &data->res.seq_res, task); 7638 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7639 data->timestamp = jiffies; 7640 } 7641 7642 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7643 { 7644 struct nfs_release_lockowner_data *data = calldata; 7645 struct nfs_server *server = data->server; 7646 7647 nfs40_sequence_done(task, &data->res.seq_res); 7648 7649 switch (task->tk_status) { 7650 case 0: 7651 renew_lease(server, data->timestamp); 7652 break; 7653 case -NFS4ERR_STALE_CLIENTID: 7654 case -NFS4ERR_EXPIRED: 7655 nfs4_schedule_lease_recovery(server->nfs_client); 7656 break; 7657 case -NFS4ERR_LEASE_MOVED: 7658 case -NFS4ERR_DELAY: 7659 if (nfs4_async_handle_error(task, server, 7660 NULL, NULL) == -EAGAIN) 7661 rpc_restart_call_prepare(task); 7662 } 7663 } 7664 7665 static void nfs4_release_lockowner_release(void *calldata) 7666 { 7667 struct nfs_release_lockowner_data *data = calldata; 7668 nfs4_free_lock_state(data->server, data->lsp); 7669 kfree(calldata); 7670 } 7671 7672 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7673 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7674 .rpc_call_done = nfs4_release_lockowner_done, 7675 .rpc_release = nfs4_release_lockowner_release, 7676 }; 7677 7678 static void 7679 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7680 { 7681 struct nfs_release_lockowner_data *data; 7682 struct rpc_message msg = { 7683 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7684 }; 7685 7686 if (server->nfs_client->cl_mvops->minor_version != 0) 7687 return; 7688 7689 data = kmalloc(sizeof(*data), GFP_KERNEL); 7690 if (!data) 7691 return; 7692 data->lsp = lsp; 7693 data->server = server; 7694 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7695 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7696 data->args.lock_owner.s_dev = server->s_dev; 7697 7698 msg.rpc_argp = &data->args; 7699 msg.rpc_resp = &data->res; 7700 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7701 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7702 } 7703 7704 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7705 7706 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7707 struct mnt_idmap *idmap, 7708 struct dentry *unused, struct inode *inode, 7709 const char *key, const void *buf, 7710 size_t buflen, int flags) 7711 { 7712 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7713 } 7714 7715 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7716 struct dentry *unused, struct inode *inode, 7717 const char *key, void *buf, size_t buflen) 7718 { 7719 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7720 } 7721 7722 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7723 { 7724 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7725 } 7726 7727 #if defined(CONFIG_NFS_V4_1) 7728 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7729 7730 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7731 struct mnt_idmap *idmap, 7732 struct dentry *unused, struct inode *inode, 7733 const char *key, const void *buf, 7734 size_t buflen, int flags) 7735 { 7736 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7737 } 7738 7739 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7740 struct dentry *unused, struct inode *inode, 7741 const char *key, void *buf, size_t buflen) 7742 { 7743 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7744 } 7745 7746 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7747 { 7748 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7749 } 7750 7751 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7752 7753 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7754 struct mnt_idmap *idmap, 7755 struct dentry *unused, struct inode *inode, 7756 const char *key, const void *buf, 7757 size_t buflen, int flags) 7758 { 7759 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7760 } 7761 7762 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7763 struct dentry *unused, struct inode *inode, 7764 const char *key, void *buf, size_t buflen) 7765 { 7766 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7767 } 7768 7769 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7770 { 7771 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7772 } 7773 7774 #endif 7775 7776 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7777 7778 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7779 struct mnt_idmap *idmap, 7780 struct dentry *unused, struct inode *inode, 7781 const char *key, const void *buf, 7782 size_t buflen, int flags) 7783 { 7784 if (security_ismaclabel(key)) 7785 return nfs4_set_security_label(inode, buf, buflen); 7786 7787 return -EOPNOTSUPP; 7788 } 7789 7790 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7791 struct dentry *unused, struct inode *inode, 7792 const char *key, void *buf, size_t buflen) 7793 { 7794 if (security_ismaclabel(key)) 7795 return nfs4_get_security_label(inode, buf, buflen); 7796 return -EOPNOTSUPP; 7797 } 7798 7799 static ssize_t 7800 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7801 { 7802 int len = 0; 7803 7804 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7805 len = security_inode_listsecurity(inode, list, list_len); 7806 if (len >= 0 && list_len && len > list_len) 7807 return -ERANGE; 7808 } 7809 return len; 7810 } 7811 7812 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7813 .prefix = XATTR_SECURITY_PREFIX, 7814 .get = nfs4_xattr_get_nfs4_label, 7815 .set = nfs4_xattr_set_nfs4_label, 7816 }; 7817 7818 #else 7819 7820 static ssize_t 7821 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7822 { 7823 return 0; 7824 } 7825 7826 #endif 7827 7828 #ifdef CONFIG_NFS_V4_2 7829 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7830 struct mnt_idmap *idmap, 7831 struct dentry *unused, struct inode *inode, 7832 const char *key, const void *buf, 7833 size_t buflen, int flags) 7834 { 7835 u32 mask; 7836 int ret; 7837 7838 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7839 return -EOPNOTSUPP; 7840 7841 /* 7842 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7843 * flags right now. Handling of xattr operations use the normal 7844 * file read/write permissions. 7845 * 7846 * Just in case the server has other ideas (which RFC 8276 allows), 7847 * do a cached access check for the XA* flags to possibly avoid 7848 * doing an RPC and getting EACCES back. 7849 */ 7850 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7851 if (!(mask & NFS_ACCESS_XAWRITE)) 7852 return -EACCES; 7853 } 7854 7855 if (buf == NULL) { 7856 ret = nfs42_proc_removexattr(inode, key); 7857 if (!ret) 7858 nfs4_xattr_cache_remove(inode, key); 7859 } else { 7860 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7861 if (!ret) 7862 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7863 } 7864 7865 return ret; 7866 } 7867 7868 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7869 struct dentry *unused, struct inode *inode, 7870 const char *key, void *buf, size_t buflen) 7871 { 7872 u32 mask; 7873 ssize_t ret; 7874 7875 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7876 return -EOPNOTSUPP; 7877 7878 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7879 if (!(mask & NFS_ACCESS_XAREAD)) 7880 return -EACCES; 7881 } 7882 7883 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7884 if (ret) 7885 return ret; 7886 7887 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7888 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7889 return ret; 7890 7891 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7892 7893 return ret; 7894 } 7895 7896 static ssize_t 7897 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7898 { 7899 u64 cookie; 7900 bool eof; 7901 ssize_t ret, size; 7902 char *buf; 7903 size_t buflen; 7904 u32 mask; 7905 7906 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7907 return 0; 7908 7909 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7910 if (!(mask & NFS_ACCESS_XALIST)) 7911 return 0; 7912 } 7913 7914 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7915 if (ret) 7916 return ret; 7917 7918 ret = nfs4_xattr_cache_list(inode, list, list_len); 7919 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7920 return ret; 7921 7922 cookie = 0; 7923 eof = false; 7924 buflen = list_len ? list_len : XATTR_LIST_MAX; 7925 buf = list_len ? list : NULL; 7926 size = 0; 7927 7928 while (!eof) { 7929 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7930 &cookie, &eof); 7931 if (ret < 0) 7932 return ret; 7933 7934 if (list_len) { 7935 buf += ret; 7936 buflen -= ret; 7937 } 7938 size += ret; 7939 } 7940 7941 if (list_len) 7942 nfs4_xattr_cache_set_list(inode, list, size); 7943 7944 return size; 7945 } 7946 7947 #else 7948 7949 static ssize_t 7950 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7951 { 7952 return 0; 7953 } 7954 #endif /* CONFIG_NFS_V4_2 */ 7955 7956 /* 7957 * nfs_fhget will use either the mounted_on_fileid or the fileid 7958 */ 7959 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7960 { 7961 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7962 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7963 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7964 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7965 return; 7966 7967 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7968 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7969 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7970 fattr->nlink = 2; 7971 } 7972 7973 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7974 const struct qstr *name, 7975 struct nfs4_fs_locations *fs_locations, 7976 struct page *page) 7977 { 7978 struct nfs_server *server = NFS_SERVER(dir); 7979 u32 bitmask[3]; 7980 struct nfs4_fs_locations_arg args = { 7981 .dir_fh = NFS_FH(dir), 7982 .name = name, 7983 .page = page, 7984 .bitmask = bitmask, 7985 }; 7986 struct nfs4_fs_locations_res res = { 7987 .fs_locations = fs_locations, 7988 }; 7989 struct rpc_message msg = { 7990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7991 .rpc_argp = &args, 7992 .rpc_resp = &res, 7993 }; 7994 int status; 7995 7996 dprintk("%s: start\n", __func__); 7997 7998 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7999 bitmask[1] = nfs4_fattr_bitmap[1]; 8000 8001 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8002 * is not supported */ 8003 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8004 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8005 else 8006 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8007 8008 nfs_fattr_init(fs_locations->fattr); 8009 fs_locations->server = server; 8010 fs_locations->nlocations = 0; 8011 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8012 dprintk("%s: returned status = %d\n", __func__, status); 8013 return status; 8014 } 8015 8016 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8017 const struct qstr *name, 8018 struct nfs4_fs_locations *fs_locations, 8019 struct page *page) 8020 { 8021 struct nfs4_exception exception = { 8022 .interruptible = true, 8023 }; 8024 int err; 8025 do { 8026 err = _nfs4_proc_fs_locations(client, dir, name, 8027 fs_locations, page); 8028 trace_nfs4_get_fs_locations(dir, name, err); 8029 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8030 &exception); 8031 } while (exception.retry); 8032 return err; 8033 } 8034 8035 /* 8036 * This operation also signals the server that this client is 8037 * performing migration recovery. The server can stop returning 8038 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8039 * appended to this compound to identify the client ID which is 8040 * performing recovery. 8041 */ 8042 static int _nfs40_proc_get_locations(struct nfs_server *server, 8043 struct nfs_fh *fhandle, 8044 struct nfs4_fs_locations *locations, 8045 struct page *page, const struct cred *cred) 8046 { 8047 struct rpc_clnt *clnt = server->client; 8048 u32 bitmask[2] = { 8049 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8050 }; 8051 struct nfs4_fs_locations_arg args = { 8052 .clientid = server->nfs_client->cl_clientid, 8053 .fh = fhandle, 8054 .page = page, 8055 .bitmask = bitmask, 8056 .migration = 1, /* skip LOOKUP */ 8057 .renew = 1, /* append RENEW */ 8058 }; 8059 struct nfs4_fs_locations_res res = { 8060 .fs_locations = locations, 8061 .migration = 1, 8062 .renew = 1, 8063 }; 8064 struct rpc_message msg = { 8065 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8066 .rpc_argp = &args, 8067 .rpc_resp = &res, 8068 .rpc_cred = cred, 8069 }; 8070 unsigned long now = jiffies; 8071 int status; 8072 8073 nfs_fattr_init(locations->fattr); 8074 locations->server = server; 8075 locations->nlocations = 0; 8076 8077 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8078 status = nfs4_call_sync_sequence(clnt, server, &msg, 8079 &args.seq_args, &res.seq_res); 8080 if (status) 8081 return status; 8082 8083 renew_lease(server, now); 8084 return 0; 8085 } 8086 8087 #ifdef CONFIG_NFS_V4_1 8088 8089 /* 8090 * This operation also signals the server that this client is 8091 * performing migration recovery. The server can stop asserting 8092 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8093 * performing this operation is identified in the SEQUENCE 8094 * operation in this compound. 8095 * 8096 * When the client supports GETATTR(fs_locations_info), it can 8097 * be plumbed in here. 8098 */ 8099 static int _nfs41_proc_get_locations(struct nfs_server *server, 8100 struct nfs_fh *fhandle, 8101 struct nfs4_fs_locations *locations, 8102 struct page *page, const struct cred *cred) 8103 { 8104 struct rpc_clnt *clnt = server->client; 8105 u32 bitmask[2] = { 8106 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8107 }; 8108 struct nfs4_fs_locations_arg args = { 8109 .fh = fhandle, 8110 .page = page, 8111 .bitmask = bitmask, 8112 .migration = 1, /* skip LOOKUP */ 8113 }; 8114 struct nfs4_fs_locations_res res = { 8115 .fs_locations = locations, 8116 .migration = 1, 8117 }; 8118 struct rpc_message msg = { 8119 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8120 .rpc_argp = &args, 8121 .rpc_resp = &res, 8122 .rpc_cred = cred, 8123 }; 8124 struct nfs4_call_sync_data data = { 8125 .seq_server = server, 8126 .seq_args = &args.seq_args, 8127 .seq_res = &res.seq_res, 8128 }; 8129 struct rpc_task_setup task_setup_data = { 8130 .rpc_client = clnt, 8131 .rpc_message = &msg, 8132 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8133 .callback_data = &data, 8134 .flags = RPC_TASK_NO_ROUND_ROBIN, 8135 }; 8136 int status; 8137 8138 nfs_fattr_init(locations->fattr); 8139 locations->server = server; 8140 locations->nlocations = 0; 8141 8142 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8143 status = nfs4_call_sync_custom(&task_setup_data); 8144 if (status == NFS4_OK && 8145 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8146 status = -NFS4ERR_LEASE_MOVED; 8147 return status; 8148 } 8149 8150 #endif /* CONFIG_NFS_V4_1 */ 8151 8152 /** 8153 * nfs4_proc_get_locations - discover locations for a migrated FSID 8154 * @server: pointer to nfs_server to process 8155 * @fhandle: pointer to the kernel NFS client file handle 8156 * @locations: result of query 8157 * @page: buffer 8158 * @cred: credential to use for this operation 8159 * 8160 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8161 * operation failed, or a negative errno if a local error occurred. 8162 * 8163 * On success, "locations" is filled in, but if the server has 8164 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8165 * asserted. 8166 * 8167 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8168 * from this client that require migration recovery. 8169 */ 8170 int nfs4_proc_get_locations(struct nfs_server *server, 8171 struct nfs_fh *fhandle, 8172 struct nfs4_fs_locations *locations, 8173 struct page *page, const struct cred *cred) 8174 { 8175 struct nfs_client *clp = server->nfs_client; 8176 const struct nfs4_mig_recovery_ops *ops = 8177 clp->cl_mvops->mig_recovery_ops; 8178 struct nfs4_exception exception = { 8179 .interruptible = true, 8180 }; 8181 int status; 8182 8183 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8184 (unsigned long long)server->fsid.major, 8185 (unsigned long long)server->fsid.minor, 8186 clp->cl_hostname); 8187 nfs_display_fhandle(fhandle, __func__); 8188 8189 do { 8190 status = ops->get_locations(server, fhandle, locations, page, 8191 cred); 8192 if (status != -NFS4ERR_DELAY) 8193 break; 8194 nfs4_handle_exception(server, status, &exception); 8195 } while (exception.retry); 8196 return status; 8197 } 8198 8199 /* 8200 * This operation also signals the server that this client is 8201 * performing "lease moved" recovery. The server can stop 8202 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8203 * is appended to this compound to identify the client ID which is 8204 * performing recovery. 8205 */ 8206 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8207 { 8208 struct nfs_server *server = NFS_SERVER(inode); 8209 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8210 struct rpc_clnt *clnt = server->client; 8211 struct nfs4_fsid_present_arg args = { 8212 .fh = NFS_FH(inode), 8213 .clientid = clp->cl_clientid, 8214 .renew = 1, /* append RENEW */ 8215 }; 8216 struct nfs4_fsid_present_res res = { 8217 .renew = 1, 8218 }; 8219 struct rpc_message msg = { 8220 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8221 .rpc_argp = &args, 8222 .rpc_resp = &res, 8223 .rpc_cred = cred, 8224 }; 8225 unsigned long now = jiffies; 8226 int status; 8227 8228 res.fh = nfs_alloc_fhandle(); 8229 if (res.fh == NULL) 8230 return -ENOMEM; 8231 8232 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8233 status = nfs4_call_sync_sequence(clnt, server, &msg, 8234 &args.seq_args, &res.seq_res); 8235 nfs_free_fhandle(res.fh); 8236 if (status) 8237 return status; 8238 8239 do_renew_lease(clp, now); 8240 return 0; 8241 } 8242 8243 #ifdef CONFIG_NFS_V4_1 8244 8245 /* 8246 * This operation also signals the server that this client is 8247 * performing "lease moved" recovery. The server can stop asserting 8248 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8249 * this operation is identified in the SEQUENCE operation in this 8250 * compound. 8251 */ 8252 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8253 { 8254 struct nfs_server *server = NFS_SERVER(inode); 8255 struct rpc_clnt *clnt = server->client; 8256 struct nfs4_fsid_present_arg args = { 8257 .fh = NFS_FH(inode), 8258 }; 8259 struct nfs4_fsid_present_res res = { 8260 }; 8261 struct rpc_message msg = { 8262 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8263 .rpc_argp = &args, 8264 .rpc_resp = &res, 8265 .rpc_cred = cred, 8266 }; 8267 int status; 8268 8269 res.fh = nfs_alloc_fhandle(); 8270 if (res.fh == NULL) 8271 return -ENOMEM; 8272 8273 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8274 status = nfs4_call_sync_sequence(clnt, server, &msg, 8275 &args.seq_args, &res.seq_res); 8276 nfs_free_fhandle(res.fh); 8277 if (status == NFS4_OK && 8278 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8279 status = -NFS4ERR_LEASE_MOVED; 8280 return status; 8281 } 8282 8283 #endif /* CONFIG_NFS_V4_1 */ 8284 8285 /** 8286 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8287 * @inode: inode on FSID to check 8288 * @cred: credential to use for this operation 8289 * 8290 * Server indicates whether the FSID is present, moved, or not 8291 * recognized. This operation is necessary to clear a LEASE_MOVED 8292 * condition for this client ID. 8293 * 8294 * Returns NFS4_OK if the FSID is present on this server, 8295 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8296 * NFS4ERR code if some error occurred on the server, or a 8297 * negative errno if a local failure occurred. 8298 */ 8299 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8300 { 8301 struct nfs_server *server = NFS_SERVER(inode); 8302 struct nfs_client *clp = server->nfs_client; 8303 const struct nfs4_mig_recovery_ops *ops = 8304 clp->cl_mvops->mig_recovery_ops; 8305 struct nfs4_exception exception = { 8306 .interruptible = true, 8307 }; 8308 int status; 8309 8310 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8311 (unsigned long long)server->fsid.major, 8312 (unsigned long long)server->fsid.minor, 8313 clp->cl_hostname); 8314 nfs_display_fhandle(NFS_FH(inode), __func__); 8315 8316 do { 8317 status = ops->fsid_present(inode, cred); 8318 if (status != -NFS4ERR_DELAY) 8319 break; 8320 nfs4_handle_exception(server, status, &exception); 8321 } while (exception.retry); 8322 return status; 8323 } 8324 8325 /* 8326 * If 'use_integrity' is true and the state managment nfs_client 8327 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8328 * and the machine credential as per RFC3530bis and RFC5661 Security 8329 * Considerations sections. Otherwise, just use the user cred with the 8330 * filesystem's rpc_client. 8331 */ 8332 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8333 { 8334 int status; 8335 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8336 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8337 struct nfs4_secinfo_arg args = { 8338 .dir_fh = NFS_FH(dir), 8339 .name = name, 8340 }; 8341 struct nfs4_secinfo_res res = { 8342 .flavors = flavors, 8343 }; 8344 struct rpc_message msg = { 8345 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8346 .rpc_argp = &args, 8347 .rpc_resp = &res, 8348 }; 8349 struct nfs4_call_sync_data data = { 8350 .seq_server = NFS_SERVER(dir), 8351 .seq_args = &args.seq_args, 8352 .seq_res = &res.seq_res, 8353 }; 8354 struct rpc_task_setup task_setup = { 8355 .rpc_client = clnt, 8356 .rpc_message = &msg, 8357 .callback_ops = clp->cl_mvops->call_sync_ops, 8358 .callback_data = &data, 8359 .flags = RPC_TASK_NO_ROUND_ROBIN, 8360 }; 8361 const struct cred *cred = NULL; 8362 8363 if (use_integrity) { 8364 clnt = clp->cl_rpcclient; 8365 task_setup.rpc_client = clnt; 8366 8367 cred = nfs4_get_clid_cred(clp); 8368 msg.rpc_cred = cred; 8369 } 8370 8371 dprintk("NFS call secinfo %s\n", name->name); 8372 8373 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8374 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8375 status = nfs4_call_sync_custom(&task_setup); 8376 8377 dprintk("NFS reply secinfo: %d\n", status); 8378 8379 put_cred(cred); 8380 return status; 8381 } 8382 8383 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8384 struct nfs4_secinfo_flavors *flavors) 8385 { 8386 struct nfs4_exception exception = { 8387 .interruptible = true, 8388 }; 8389 int err; 8390 do { 8391 err = -NFS4ERR_WRONGSEC; 8392 8393 /* try to use integrity protection with machine cred */ 8394 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8395 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8396 8397 /* 8398 * if unable to use integrity protection, or SECINFO with 8399 * integrity protection returns NFS4ERR_WRONGSEC (which is 8400 * disallowed by spec, but exists in deployed servers) use 8401 * the current filesystem's rpc_client and the user cred. 8402 */ 8403 if (err == -NFS4ERR_WRONGSEC) 8404 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8405 8406 trace_nfs4_secinfo(dir, name, err); 8407 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8408 &exception); 8409 } while (exception.retry); 8410 return err; 8411 } 8412 8413 #ifdef CONFIG_NFS_V4_1 8414 /* 8415 * Check the exchange flags returned by the server for invalid flags, having 8416 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8417 * DS flags set. 8418 */ 8419 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8420 { 8421 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8422 goto out_inval; 8423 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8424 goto out_inval; 8425 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8426 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8427 goto out_inval; 8428 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8429 goto out_inval; 8430 return NFS_OK; 8431 out_inval: 8432 return -NFS4ERR_INVAL; 8433 } 8434 8435 static bool 8436 nfs41_same_server_scope(struct nfs41_server_scope *a, 8437 struct nfs41_server_scope *b) 8438 { 8439 if (a->server_scope_sz != b->server_scope_sz) 8440 return false; 8441 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8442 } 8443 8444 static void 8445 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8446 { 8447 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8448 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8449 struct nfs_client *clp = args->client; 8450 8451 switch (task->tk_status) { 8452 case -NFS4ERR_BADSESSION: 8453 case -NFS4ERR_DEADSESSION: 8454 nfs4_schedule_session_recovery(clp->cl_session, 8455 task->tk_status); 8456 return; 8457 } 8458 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8459 res->dir != NFS4_CDFS4_BOTH) { 8460 rpc_task_close_connection(task); 8461 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8462 rpc_restart_call(task); 8463 } 8464 } 8465 8466 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8467 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8468 }; 8469 8470 /* 8471 * nfs4_proc_bind_one_conn_to_session() 8472 * 8473 * The 4.1 client currently uses the same TCP connection for the 8474 * fore and backchannel. 8475 */ 8476 static 8477 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8478 struct rpc_xprt *xprt, 8479 struct nfs_client *clp, 8480 const struct cred *cred) 8481 { 8482 int status; 8483 struct nfs41_bind_conn_to_session_args args = { 8484 .client = clp, 8485 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8486 .retries = 0, 8487 }; 8488 struct nfs41_bind_conn_to_session_res res; 8489 struct rpc_message msg = { 8490 .rpc_proc = 8491 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8492 .rpc_argp = &args, 8493 .rpc_resp = &res, 8494 .rpc_cred = cred, 8495 }; 8496 struct rpc_task_setup task_setup_data = { 8497 .rpc_client = clnt, 8498 .rpc_xprt = xprt, 8499 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8500 .rpc_message = &msg, 8501 .flags = RPC_TASK_TIMEOUT, 8502 }; 8503 struct rpc_task *task; 8504 8505 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8506 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8507 args.dir = NFS4_CDFC4_FORE; 8508 8509 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8510 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8511 args.dir = NFS4_CDFC4_FORE; 8512 8513 task = rpc_run_task(&task_setup_data); 8514 if (!IS_ERR(task)) { 8515 status = task->tk_status; 8516 rpc_put_task(task); 8517 } else 8518 status = PTR_ERR(task); 8519 trace_nfs4_bind_conn_to_session(clp, status); 8520 if (status == 0) { 8521 if (memcmp(res.sessionid.data, 8522 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8523 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8524 return -EIO; 8525 } 8526 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8527 dprintk("NFS: %s: Unexpected direction from server\n", 8528 __func__); 8529 return -EIO; 8530 } 8531 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8532 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8533 __func__); 8534 return -EIO; 8535 } 8536 } 8537 8538 return status; 8539 } 8540 8541 struct rpc_bind_conn_calldata { 8542 struct nfs_client *clp; 8543 const struct cred *cred; 8544 }; 8545 8546 static int 8547 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8548 struct rpc_xprt *xprt, 8549 void *calldata) 8550 { 8551 struct rpc_bind_conn_calldata *p = calldata; 8552 8553 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8554 } 8555 8556 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8557 { 8558 struct rpc_bind_conn_calldata data = { 8559 .clp = clp, 8560 .cred = cred, 8561 }; 8562 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8563 nfs4_proc_bind_conn_to_session_callback, &data); 8564 } 8565 8566 /* 8567 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8568 * and operations we'd like to see to enable certain features in the allow map 8569 */ 8570 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8571 .how = SP4_MACH_CRED, 8572 .enforce.u.words = { 8573 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8574 1 << (OP_EXCHANGE_ID - 32) | 8575 1 << (OP_CREATE_SESSION - 32) | 8576 1 << (OP_DESTROY_SESSION - 32) | 8577 1 << (OP_DESTROY_CLIENTID - 32) 8578 }, 8579 .allow.u.words = { 8580 [0] = 1 << (OP_CLOSE) | 8581 1 << (OP_OPEN_DOWNGRADE) | 8582 1 << (OP_LOCKU) | 8583 1 << (OP_DELEGRETURN) | 8584 1 << (OP_COMMIT), 8585 [1] = 1 << (OP_SECINFO - 32) | 8586 1 << (OP_SECINFO_NO_NAME - 32) | 8587 1 << (OP_LAYOUTRETURN - 32) | 8588 1 << (OP_TEST_STATEID - 32) | 8589 1 << (OP_FREE_STATEID - 32) | 8590 1 << (OP_WRITE - 32) 8591 } 8592 }; 8593 8594 /* 8595 * Select the state protection mode for client `clp' given the server results 8596 * from exchange_id in `sp'. 8597 * 8598 * Returns 0 on success, negative errno otherwise. 8599 */ 8600 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8601 struct nfs41_state_protection *sp) 8602 { 8603 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8604 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8605 1 << (OP_EXCHANGE_ID - 32) | 8606 1 << (OP_CREATE_SESSION - 32) | 8607 1 << (OP_DESTROY_SESSION - 32) | 8608 1 << (OP_DESTROY_CLIENTID - 32) 8609 }; 8610 unsigned long flags = 0; 8611 unsigned int i; 8612 int ret = 0; 8613 8614 if (sp->how == SP4_MACH_CRED) { 8615 /* Print state protect result */ 8616 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8617 for (i = 0; i <= LAST_NFS4_OP; i++) { 8618 if (test_bit(i, sp->enforce.u.longs)) 8619 dfprintk(MOUNT, " enforce op %d\n", i); 8620 if (test_bit(i, sp->allow.u.longs)) 8621 dfprintk(MOUNT, " allow op %d\n", i); 8622 } 8623 8624 /* make sure nothing is on enforce list that isn't supported */ 8625 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8626 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8627 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8628 ret = -EINVAL; 8629 goto out; 8630 } 8631 } 8632 8633 /* 8634 * Minimal mode - state operations are allowed to use machine 8635 * credential. Note this already happens by default, so the 8636 * client doesn't have to do anything more than the negotiation. 8637 * 8638 * NOTE: we don't care if EXCHANGE_ID is in the list - 8639 * we're already using the machine cred for exchange_id 8640 * and will never use a different cred. 8641 */ 8642 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8643 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8644 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8645 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8646 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8647 dfprintk(MOUNT, " minimal mode enabled\n"); 8648 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8649 } else { 8650 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8651 ret = -EINVAL; 8652 goto out; 8653 } 8654 8655 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8656 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8657 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8658 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8659 dfprintk(MOUNT, " cleanup mode enabled\n"); 8660 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8661 } 8662 8663 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8664 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8665 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8666 } 8667 8668 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8669 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8670 dfprintk(MOUNT, " secinfo mode enabled\n"); 8671 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8672 } 8673 8674 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8675 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8676 dfprintk(MOUNT, " stateid mode enabled\n"); 8677 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8678 } 8679 8680 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8681 dfprintk(MOUNT, " write mode enabled\n"); 8682 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8683 } 8684 8685 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8686 dfprintk(MOUNT, " commit mode enabled\n"); 8687 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8688 } 8689 } 8690 out: 8691 clp->cl_sp4_flags = flags; 8692 return ret; 8693 } 8694 8695 struct nfs41_exchange_id_data { 8696 struct nfs41_exchange_id_res res; 8697 struct nfs41_exchange_id_args args; 8698 }; 8699 8700 static void nfs4_exchange_id_release(void *data) 8701 { 8702 struct nfs41_exchange_id_data *cdata = 8703 (struct nfs41_exchange_id_data *)data; 8704 8705 nfs_put_client(cdata->args.client); 8706 kfree(cdata->res.impl_id); 8707 kfree(cdata->res.server_scope); 8708 kfree(cdata->res.server_owner); 8709 kfree(cdata); 8710 } 8711 8712 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8713 .rpc_release = nfs4_exchange_id_release, 8714 }; 8715 8716 /* 8717 * _nfs4_proc_exchange_id() 8718 * 8719 * Wrapper for EXCHANGE_ID operation. 8720 */ 8721 static struct rpc_task * 8722 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8723 u32 sp4_how, struct rpc_xprt *xprt) 8724 { 8725 struct rpc_message msg = { 8726 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8727 .rpc_cred = cred, 8728 }; 8729 struct rpc_task_setup task_setup_data = { 8730 .rpc_client = clp->cl_rpcclient, 8731 .callback_ops = &nfs4_exchange_id_call_ops, 8732 .rpc_message = &msg, 8733 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8734 }; 8735 struct nfs41_exchange_id_data *calldata; 8736 int status; 8737 8738 if (!refcount_inc_not_zero(&clp->cl_count)) 8739 return ERR_PTR(-EIO); 8740 8741 status = -ENOMEM; 8742 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8743 if (!calldata) 8744 goto out; 8745 8746 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8747 8748 status = nfs4_init_uniform_client_string(clp); 8749 if (status) 8750 goto out_calldata; 8751 8752 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8753 GFP_NOFS); 8754 status = -ENOMEM; 8755 if (unlikely(calldata->res.server_owner == NULL)) 8756 goto out_calldata; 8757 8758 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8759 GFP_NOFS); 8760 if (unlikely(calldata->res.server_scope == NULL)) 8761 goto out_server_owner; 8762 8763 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8764 if (unlikely(calldata->res.impl_id == NULL)) 8765 goto out_server_scope; 8766 8767 switch (sp4_how) { 8768 case SP4_NONE: 8769 calldata->args.state_protect.how = SP4_NONE; 8770 break; 8771 8772 case SP4_MACH_CRED: 8773 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8774 break; 8775 8776 default: 8777 /* unsupported! */ 8778 WARN_ON_ONCE(1); 8779 status = -EINVAL; 8780 goto out_impl_id; 8781 } 8782 if (xprt) { 8783 task_setup_data.rpc_xprt = xprt; 8784 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8785 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8786 sizeof(calldata->args.verifier.data)); 8787 } 8788 calldata->args.client = clp; 8789 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8790 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8791 #ifdef CONFIG_NFS_V4_1_MIGRATION 8792 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8793 #endif 8794 if (test_bit(NFS_CS_DS, &clp->cl_flags)) 8795 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8796 msg.rpc_argp = &calldata->args; 8797 msg.rpc_resp = &calldata->res; 8798 task_setup_data.callback_data = calldata; 8799 8800 return rpc_run_task(&task_setup_data); 8801 8802 out_impl_id: 8803 kfree(calldata->res.impl_id); 8804 out_server_scope: 8805 kfree(calldata->res.server_scope); 8806 out_server_owner: 8807 kfree(calldata->res.server_owner); 8808 out_calldata: 8809 kfree(calldata); 8810 out: 8811 nfs_put_client(clp); 8812 return ERR_PTR(status); 8813 } 8814 8815 /* 8816 * _nfs4_proc_exchange_id() 8817 * 8818 * Wrapper for EXCHANGE_ID operation. 8819 */ 8820 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8821 u32 sp4_how) 8822 { 8823 struct rpc_task *task; 8824 struct nfs41_exchange_id_args *argp; 8825 struct nfs41_exchange_id_res *resp; 8826 unsigned long now = jiffies; 8827 int status; 8828 8829 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8830 if (IS_ERR(task)) 8831 return PTR_ERR(task); 8832 8833 argp = task->tk_msg.rpc_argp; 8834 resp = task->tk_msg.rpc_resp; 8835 status = task->tk_status; 8836 if (status != 0) 8837 goto out; 8838 8839 status = nfs4_check_cl_exchange_flags(resp->flags, 8840 clp->cl_mvops->minor_version); 8841 if (status != 0) 8842 goto out; 8843 8844 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8845 if (status != 0) 8846 goto out; 8847 8848 do_renew_lease(clp, now); 8849 8850 clp->cl_clientid = resp->clientid; 8851 clp->cl_exchange_flags = resp->flags; 8852 clp->cl_seqid = resp->seqid; 8853 /* Client ID is not confirmed */ 8854 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8855 clear_bit(NFS4_SESSION_ESTABLISHED, 8856 &clp->cl_session->session_state); 8857 8858 if (clp->cl_serverscope != NULL && 8859 !nfs41_same_server_scope(clp->cl_serverscope, 8860 resp->server_scope)) { 8861 dprintk("%s: server_scope mismatch detected\n", 8862 __func__); 8863 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8864 } 8865 8866 swap(clp->cl_serverowner, resp->server_owner); 8867 swap(clp->cl_serverscope, resp->server_scope); 8868 swap(clp->cl_implid, resp->impl_id); 8869 8870 /* Save the EXCHANGE_ID verifier session trunk tests */ 8871 memcpy(clp->cl_confirm.data, argp->verifier.data, 8872 sizeof(clp->cl_confirm.data)); 8873 out: 8874 trace_nfs4_exchange_id(clp, status); 8875 rpc_put_task(task); 8876 return status; 8877 } 8878 8879 /* 8880 * nfs4_proc_exchange_id() 8881 * 8882 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8883 * 8884 * Since the clientid has expired, all compounds using sessions 8885 * associated with the stale clientid will be returning 8886 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8887 * be in some phase of session reset. 8888 * 8889 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8890 */ 8891 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8892 { 8893 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8894 int status; 8895 8896 /* try SP4_MACH_CRED if krb5i/p */ 8897 if (authflavor == RPC_AUTH_GSS_KRB5I || 8898 authflavor == RPC_AUTH_GSS_KRB5P) { 8899 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8900 if (!status) 8901 return 0; 8902 } 8903 8904 /* try SP4_NONE */ 8905 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8906 } 8907 8908 /** 8909 * nfs4_test_session_trunk 8910 * 8911 * This is an add_xprt_test() test function called from 8912 * rpc_clnt_setup_test_and_add_xprt. 8913 * 8914 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8915 * and is dereferrenced in nfs4_exchange_id_release 8916 * 8917 * Upon success, add the new transport to the rpc_clnt 8918 * 8919 * @clnt: struct rpc_clnt to get new transport 8920 * @xprt: the rpc_xprt to test 8921 * @data: call data for _nfs4_proc_exchange_id. 8922 */ 8923 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8924 void *data) 8925 { 8926 struct nfs4_add_xprt_data *adata = data; 8927 struct rpc_task *task; 8928 int status; 8929 8930 u32 sp4_how; 8931 8932 dprintk("--> %s try %s\n", __func__, 8933 xprt->address_strings[RPC_DISPLAY_ADDR]); 8934 8935 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8936 8937 /* Test connection for session trunking. Async exchange_id call */ 8938 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8939 if (IS_ERR(task)) 8940 return; 8941 8942 status = task->tk_status; 8943 if (status == 0) 8944 status = nfs4_detect_session_trunking(adata->clp, 8945 task->tk_msg.rpc_resp, xprt); 8946 8947 if (status == 0) 8948 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8949 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8950 (struct sockaddr *)&xprt->addr)) 8951 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8952 8953 rpc_put_task(task); 8954 } 8955 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8956 8957 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8958 const struct cred *cred) 8959 { 8960 struct rpc_message msg = { 8961 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8962 .rpc_argp = clp, 8963 .rpc_cred = cred, 8964 }; 8965 int status; 8966 8967 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8968 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8969 trace_nfs4_destroy_clientid(clp, status); 8970 if (status) 8971 dprintk("NFS: Got error %d from the server %s on " 8972 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8973 return status; 8974 } 8975 8976 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8977 const struct cred *cred) 8978 { 8979 unsigned int loop; 8980 int ret; 8981 8982 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8983 ret = _nfs4_proc_destroy_clientid(clp, cred); 8984 switch (ret) { 8985 case -NFS4ERR_DELAY: 8986 case -NFS4ERR_CLIENTID_BUSY: 8987 ssleep(1); 8988 break; 8989 default: 8990 return ret; 8991 } 8992 } 8993 return 0; 8994 } 8995 8996 int nfs4_destroy_clientid(struct nfs_client *clp) 8997 { 8998 const struct cred *cred; 8999 int ret = 0; 9000 9001 if (clp->cl_mvops->minor_version < 1) 9002 goto out; 9003 if (clp->cl_exchange_flags == 0) 9004 goto out; 9005 if (clp->cl_preserve_clid) 9006 goto out; 9007 cred = nfs4_get_clid_cred(clp); 9008 ret = nfs4_proc_destroy_clientid(clp, cred); 9009 put_cred(cred); 9010 switch (ret) { 9011 case 0: 9012 case -NFS4ERR_STALE_CLIENTID: 9013 clp->cl_exchange_flags = 0; 9014 } 9015 out: 9016 return ret; 9017 } 9018 9019 #endif /* CONFIG_NFS_V4_1 */ 9020 9021 struct nfs4_get_lease_time_data { 9022 struct nfs4_get_lease_time_args *args; 9023 struct nfs4_get_lease_time_res *res; 9024 struct nfs_client *clp; 9025 }; 9026 9027 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9028 void *calldata) 9029 { 9030 struct nfs4_get_lease_time_data *data = 9031 (struct nfs4_get_lease_time_data *)calldata; 9032 9033 /* just setup sequence, do not trigger session recovery 9034 since we're invoked within one */ 9035 nfs4_setup_sequence(data->clp, 9036 &data->args->la_seq_args, 9037 &data->res->lr_seq_res, 9038 task); 9039 } 9040 9041 /* 9042 * Called from nfs4_state_manager thread for session setup, so don't recover 9043 * from sequence operation or clientid errors. 9044 */ 9045 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9046 { 9047 struct nfs4_get_lease_time_data *data = 9048 (struct nfs4_get_lease_time_data *)calldata; 9049 9050 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9051 return; 9052 switch (task->tk_status) { 9053 case -NFS4ERR_DELAY: 9054 case -NFS4ERR_GRACE: 9055 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9056 task->tk_status = 0; 9057 fallthrough; 9058 case -NFS4ERR_RETRY_UNCACHED_REP: 9059 rpc_restart_call_prepare(task); 9060 return; 9061 } 9062 } 9063 9064 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9065 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9066 .rpc_call_done = nfs4_get_lease_time_done, 9067 }; 9068 9069 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9070 { 9071 struct nfs4_get_lease_time_args args; 9072 struct nfs4_get_lease_time_res res = { 9073 .lr_fsinfo = fsinfo, 9074 }; 9075 struct nfs4_get_lease_time_data data = { 9076 .args = &args, 9077 .res = &res, 9078 .clp = clp, 9079 }; 9080 struct rpc_message msg = { 9081 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9082 .rpc_argp = &args, 9083 .rpc_resp = &res, 9084 }; 9085 struct rpc_task_setup task_setup = { 9086 .rpc_client = clp->cl_rpcclient, 9087 .rpc_message = &msg, 9088 .callback_ops = &nfs4_get_lease_time_ops, 9089 .callback_data = &data, 9090 .flags = RPC_TASK_TIMEOUT, 9091 }; 9092 9093 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9094 return nfs4_call_sync_custom(&task_setup); 9095 } 9096 9097 #ifdef CONFIG_NFS_V4_1 9098 9099 /* 9100 * Initialize the values to be used by the client in CREATE_SESSION 9101 * If nfs4_init_session set the fore channel request and response sizes, 9102 * use them. 9103 * 9104 * Set the back channel max_resp_sz_cached to zero to force the client to 9105 * always set csa_cachethis to FALSE because the current implementation 9106 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9107 */ 9108 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9109 struct rpc_clnt *clnt) 9110 { 9111 unsigned int max_rqst_sz, max_resp_sz; 9112 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9113 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9114 9115 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9116 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9117 9118 /* Fore channel attributes */ 9119 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9120 args->fc_attrs.max_resp_sz = max_resp_sz; 9121 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9122 args->fc_attrs.max_reqs = max_session_slots; 9123 9124 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9125 "max_ops=%u max_reqs=%u\n", 9126 __func__, 9127 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9128 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9129 9130 /* Back channel attributes */ 9131 args->bc_attrs.max_rqst_sz = max_bc_payload; 9132 args->bc_attrs.max_resp_sz = max_bc_payload; 9133 args->bc_attrs.max_resp_sz_cached = 0; 9134 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9135 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9136 if (args->bc_attrs.max_reqs > max_bc_slots) 9137 args->bc_attrs.max_reqs = max_bc_slots; 9138 9139 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9140 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9141 __func__, 9142 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9143 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9144 args->bc_attrs.max_reqs); 9145 } 9146 9147 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9148 struct nfs41_create_session_res *res) 9149 { 9150 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9151 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9152 9153 if (rcvd->max_resp_sz > sent->max_resp_sz) 9154 return -EINVAL; 9155 /* 9156 * Our requested max_ops is the minimum we need; we're not 9157 * prepared to break up compounds into smaller pieces than that. 9158 * So, no point even trying to continue if the server won't 9159 * cooperate: 9160 */ 9161 if (rcvd->max_ops < sent->max_ops) 9162 return -EINVAL; 9163 if (rcvd->max_reqs == 0) 9164 return -EINVAL; 9165 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9166 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9167 return 0; 9168 } 9169 9170 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9171 struct nfs41_create_session_res *res) 9172 { 9173 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9174 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9175 9176 if (!(res->flags & SESSION4_BACK_CHAN)) 9177 goto out; 9178 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9179 return -EINVAL; 9180 if (rcvd->max_resp_sz < sent->max_resp_sz) 9181 return -EINVAL; 9182 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9183 return -EINVAL; 9184 if (rcvd->max_ops > sent->max_ops) 9185 return -EINVAL; 9186 if (rcvd->max_reqs > sent->max_reqs) 9187 return -EINVAL; 9188 out: 9189 return 0; 9190 } 9191 9192 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9193 struct nfs41_create_session_res *res) 9194 { 9195 int ret; 9196 9197 ret = nfs4_verify_fore_channel_attrs(args, res); 9198 if (ret) 9199 return ret; 9200 return nfs4_verify_back_channel_attrs(args, res); 9201 } 9202 9203 static void nfs4_update_session(struct nfs4_session *session, 9204 struct nfs41_create_session_res *res) 9205 { 9206 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9207 /* Mark client id and session as being confirmed */ 9208 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9209 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9210 session->flags = res->flags; 9211 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9212 if (res->flags & SESSION4_BACK_CHAN) 9213 memcpy(&session->bc_attrs, &res->bc_attrs, 9214 sizeof(session->bc_attrs)); 9215 } 9216 9217 static int _nfs4_proc_create_session(struct nfs_client *clp, 9218 const struct cred *cred) 9219 { 9220 struct nfs4_session *session = clp->cl_session; 9221 struct nfs41_create_session_args args = { 9222 .client = clp, 9223 .clientid = clp->cl_clientid, 9224 .seqid = clp->cl_seqid, 9225 .cb_program = NFS4_CALLBACK, 9226 }; 9227 struct nfs41_create_session_res res; 9228 9229 struct rpc_message msg = { 9230 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9231 .rpc_argp = &args, 9232 .rpc_resp = &res, 9233 .rpc_cred = cred, 9234 }; 9235 int status; 9236 9237 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9238 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9239 9240 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9241 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9242 trace_nfs4_create_session(clp, status); 9243 9244 switch (status) { 9245 case -NFS4ERR_STALE_CLIENTID: 9246 case -NFS4ERR_DELAY: 9247 case -ETIMEDOUT: 9248 case -EACCES: 9249 case -EAGAIN: 9250 goto out; 9251 } 9252 9253 clp->cl_seqid++; 9254 if (!status) { 9255 /* Verify the session's negotiated channel_attrs values */ 9256 status = nfs4_verify_channel_attrs(&args, &res); 9257 /* Increment the clientid slot sequence id */ 9258 if (status) 9259 goto out; 9260 nfs4_update_session(session, &res); 9261 } 9262 out: 9263 return status; 9264 } 9265 9266 /* 9267 * Issues a CREATE_SESSION operation to the server. 9268 * It is the responsibility of the caller to verify the session is 9269 * expired before calling this routine. 9270 */ 9271 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9272 { 9273 int status; 9274 unsigned *ptr; 9275 struct nfs4_session *session = clp->cl_session; 9276 struct nfs4_add_xprt_data xprtdata = { 9277 .clp = clp, 9278 }; 9279 struct rpc_add_xprt_test rpcdata = { 9280 .add_xprt_test = clp->cl_mvops->session_trunk, 9281 .data = &xprtdata, 9282 }; 9283 9284 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9285 9286 status = _nfs4_proc_create_session(clp, cred); 9287 if (status) 9288 goto out; 9289 9290 /* Init or reset the session slot tables */ 9291 status = nfs4_setup_session_slot_tables(session); 9292 dprintk("slot table setup returned %d\n", status); 9293 if (status) 9294 goto out; 9295 9296 ptr = (unsigned *)&session->sess_id.data[0]; 9297 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9298 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9299 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9300 out: 9301 return status; 9302 } 9303 9304 /* 9305 * Issue the over-the-wire RPC DESTROY_SESSION. 9306 * The caller must serialize access to this routine. 9307 */ 9308 int nfs4_proc_destroy_session(struct nfs4_session *session, 9309 const struct cred *cred) 9310 { 9311 struct rpc_message msg = { 9312 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9313 .rpc_argp = session, 9314 .rpc_cred = cred, 9315 }; 9316 int status = 0; 9317 9318 /* session is still being setup */ 9319 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9320 return 0; 9321 9322 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9323 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9324 trace_nfs4_destroy_session(session->clp, status); 9325 9326 if (status) 9327 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9328 "Session has been destroyed regardless...\n", status); 9329 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9330 return status; 9331 } 9332 9333 /* 9334 * Renew the cl_session lease. 9335 */ 9336 struct nfs4_sequence_data { 9337 struct nfs_client *clp; 9338 struct nfs4_sequence_args args; 9339 struct nfs4_sequence_res res; 9340 }; 9341 9342 static void nfs41_sequence_release(void *data) 9343 { 9344 struct nfs4_sequence_data *calldata = data; 9345 struct nfs_client *clp = calldata->clp; 9346 9347 if (refcount_read(&clp->cl_count) > 1) 9348 nfs4_schedule_state_renewal(clp); 9349 nfs_put_client(clp); 9350 kfree(calldata); 9351 } 9352 9353 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9354 { 9355 switch(task->tk_status) { 9356 case -NFS4ERR_DELAY: 9357 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9358 return -EAGAIN; 9359 default: 9360 nfs4_schedule_lease_recovery(clp); 9361 } 9362 return 0; 9363 } 9364 9365 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9366 { 9367 struct nfs4_sequence_data *calldata = data; 9368 struct nfs_client *clp = calldata->clp; 9369 9370 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9371 return; 9372 9373 trace_nfs4_sequence(clp, task->tk_status); 9374 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9375 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9376 if (refcount_read(&clp->cl_count) == 1) 9377 return; 9378 9379 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9380 rpc_restart_call_prepare(task); 9381 return; 9382 } 9383 } 9384 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9385 } 9386 9387 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9388 { 9389 struct nfs4_sequence_data *calldata = data; 9390 struct nfs_client *clp = calldata->clp; 9391 struct nfs4_sequence_args *args; 9392 struct nfs4_sequence_res *res; 9393 9394 args = task->tk_msg.rpc_argp; 9395 res = task->tk_msg.rpc_resp; 9396 9397 nfs4_setup_sequence(clp, args, res, task); 9398 } 9399 9400 static const struct rpc_call_ops nfs41_sequence_ops = { 9401 .rpc_call_done = nfs41_sequence_call_done, 9402 .rpc_call_prepare = nfs41_sequence_prepare, 9403 .rpc_release = nfs41_sequence_release, 9404 }; 9405 9406 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9407 const struct cred *cred, 9408 struct nfs4_slot *slot, 9409 bool is_privileged) 9410 { 9411 struct nfs4_sequence_data *calldata; 9412 struct rpc_message msg = { 9413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9414 .rpc_cred = cred, 9415 }; 9416 struct rpc_task_setup task_setup_data = { 9417 .rpc_client = clp->cl_rpcclient, 9418 .rpc_message = &msg, 9419 .callback_ops = &nfs41_sequence_ops, 9420 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9421 }; 9422 struct rpc_task *ret; 9423 9424 ret = ERR_PTR(-EIO); 9425 if (!refcount_inc_not_zero(&clp->cl_count)) 9426 goto out_err; 9427 9428 ret = ERR_PTR(-ENOMEM); 9429 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9430 if (calldata == NULL) 9431 goto out_put_clp; 9432 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9433 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9434 msg.rpc_argp = &calldata->args; 9435 msg.rpc_resp = &calldata->res; 9436 calldata->clp = clp; 9437 task_setup_data.callback_data = calldata; 9438 9439 ret = rpc_run_task(&task_setup_data); 9440 if (IS_ERR(ret)) 9441 goto out_err; 9442 return ret; 9443 out_put_clp: 9444 nfs_put_client(clp); 9445 out_err: 9446 nfs41_release_slot(slot); 9447 return ret; 9448 } 9449 9450 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9451 { 9452 struct rpc_task *task; 9453 int ret = 0; 9454 9455 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9456 return -EAGAIN; 9457 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9458 if (IS_ERR(task)) 9459 ret = PTR_ERR(task); 9460 else 9461 rpc_put_task_async(task); 9462 dprintk("<-- %s status=%d\n", __func__, ret); 9463 return ret; 9464 } 9465 9466 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9467 { 9468 struct rpc_task *task; 9469 int ret; 9470 9471 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9472 if (IS_ERR(task)) { 9473 ret = PTR_ERR(task); 9474 goto out; 9475 } 9476 ret = rpc_wait_for_completion_task(task); 9477 if (!ret) 9478 ret = task->tk_status; 9479 rpc_put_task(task); 9480 out: 9481 dprintk("<-- %s status=%d\n", __func__, ret); 9482 return ret; 9483 } 9484 9485 struct nfs4_reclaim_complete_data { 9486 struct nfs_client *clp; 9487 struct nfs41_reclaim_complete_args arg; 9488 struct nfs41_reclaim_complete_res res; 9489 }; 9490 9491 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9492 { 9493 struct nfs4_reclaim_complete_data *calldata = data; 9494 9495 nfs4_setup_sequence(calldata->clp, 9496 &calldata->arg.seq_args, 9497 &calldata->res.seq_res, 9498 task); 9499 } 9500 9501 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9502 { 9503 switch(task->tk_status) { 9504 case 0: 9505 wake_up_all(&clp->cl_lock_waitq); 9506 fallthrough; 9507 case -NFS4ERR_COMPLETE_ALREADY: 9508 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9509 break; 9510 case -NFS4ERR_DELAY: 9511 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9512 fallthrough; 9513 case -NFS4ERR_RETRY_UNCACHED_REP: 9514 case -EACCES: 9515 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9516 __func__, task->tk_status, clp->cl_hostname); 9517 return -EAGAIN; 9518 case -NFS4ERR_BADSESSION: 9519 case -NFS4ERR_DEADSESSION: 9520 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9521 break; 9522 default: 9523 nfs4_schedule_lease_recovery(clp); 9524 } 9525 return 0; 9526 } 9527 9528 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9529 { 9530 struct nfs4_reclaim_complete_data *calldata = data; 9531 struct nfs_client *clp = calldata->clp; 9532 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9533 9534 if (!nfs41_sequence_done(task, res)) 9535 return; 9536 9537 trace_nfs4_reclaim_complete(clp, task->tk_status); 9538 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9539 rpc_restart_call_prepare(task); 9540 return; 9541 } 9542 } 9543 9544 static void nfs4_free_reclaim_complete_data(void *data) 9545 { 9546 struct nfs4_reclaim_complete_data *calldata = data; 9547 9548 kfree(calldata); 9549 } 9550 9551 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9552 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9553 .rpc_call_done = nfs4_reclaim_complete_done, 9554 .rpc_release = nfs4_free_reclaim_complete_data, 9555 }; 9556 9557 /* 9558 * Issue a global reclaim complete. 9559 */ 9560 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9561 const struct cred *cred) 9562 { 9563 struct nfs4_reclaim_complete_data *calldata; 9564 struct rpc_message msg = { 9565 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9566 .rpc_cred = cred, 9567 }; 9568 struct rpc_task_setup task_setup_data = { 9569 .rpc_client = clp->cl_rpcclient, 9570 .rpc_message = &msg, 9571 .callback_ops = &nfs4_reclaim_complete_call_ops, 9572 .flags = RPC_TASK_NO_ROUND_ROBIN, 9573 }; 9574 int status = -ENOMEM; 9575 9576 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9577 if (calldata == NULL) 9578 goto out; 9579 calldata->clp = clp; 9580 calldata->arg.one_fs = 0; 9581 9582 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9583 msg.rpc_argp = &calldata->arg; 9584 msg.rpc_resp = &calldata->res; 9585 task_setup_data.callback_data = calldata; 9586 status = nfs4_call_sync_custom(&task_setup_data); 9587 out: 9588 dprintk("<-- %s status=%d\n", __func__, status); 9589 return status; 9590 } 9591 9592 static void 9593 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9594 { 9595 struct nfs4_layoutget *lgp = calldata; 9596 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9597 9598 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9599 &lgp->res.seq_res, task); 9600 } 9601 9602 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9603 { 9604 struct nfs4_layoutget *lgp = calldata; 9605 9606 nfs41_sequence_process(task, &lgp->res.seq_res); 9607 } 9608 9609 static int 9610 nfs4_layoutget_handle_exception(struct rpc_task *task, 9611 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9612 { 9613 struct inode *inode = lgp->args.inode; 9614 struct nfs_server *server = NFS_SERVER(inode); 9615 struct pnfs_layout_hdr *lo = lgp->lo; 9616 int nfs4err = task->tk_status; 9617 int err, status = 0; 9618 LIST_HEAD(head); 9619 9620 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9621 9622 nfs4_sequence_free_slot(&lgp->res.seq_res); 9623 9624 switch (nfs4err) { 9625 case 0: 9626 goto out; 9627 9628 /* 9629 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9630 * on the file. set tk_status to -ENODATA to tell upper layer to 9631 * retry go inband. 9632 */ 9633 case -NFS4ERR_LAYOUTUNAVAILABLE: 9634 status = -ENODATA; 9635 goto out; 9636 /* 9637 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9638 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9639 */ 9640 case -NFS4ERR_BADLAYOUT: 9641 status = -EOVERFLOW; 9642 goto out; 9643 /* 9644 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9645 * (or clients) writing to the same RAID stripe except when 9646 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9647 * 9648 * Treat it like we would RECALLCONFLICT -- we retry for a little 9649 * while, and then eventually give up. 9650 */ 9651 case -NFS4ERR_LAYOUTTRYLATER: 9652 if (lgp->args.minlength == 0) { 9653 status = -EOVERFLOW; 9654 goto out; 9655 } 9656 status = -EBUSY; 9657 break; 9658 case -NFS4ERR_RECALLCONFLICT: 9659 status = -ERECALLCONFLICT; 9660 break; 9661 case -NFS4ERR_DELEG_REVOKED: 9662 case -NFS4ERR_ADMIN_REVOKED: 9663 case -NFS4ERR_EXPIRED: 9664 case -NFS4ERR_BAD_STATEID: 9665 exception->timeout = 0; 9666 spin_lock(&inode->i_lock); 9667 /* If the open stateid was bad, then recover it. */ 9668 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9669 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9670 spin_unlock(&inode->i_lock); 9671 exception->state = lgp->args.ctx->state; 9672 exception->stateid = &lgp->args.stateid; 9673 break; 9674 } 9675 9676 /* 9677 * Mark the bad layout state as invalid, then retry 9678 */ 9679 pnfs_mark_layout_stateid_invalid(lo, &head); 9680 spin_unlock(&inode->i_lock); 9681 nfs_commit_inode(inode, 0); 9682 pnfs_free_lseg_list(&head); 9683 status = -EAGAIN; 9684 goto out; 9685 } 9686 9687 err = nfs4_handle_exception(server, nfs4err, exception); 9688 if (!status) { 9689 if (exception->retry) 9690 status = -EAGAIN; 9691 else 9692 status = err; 9693 } 9694 out: 9695 return status; 9696 } 9697 9698 size_t max_response_pages(struct nfs_server *server) 9699 { 9700 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9701 return nfs_page_array_len(0, max_resp_sz); 9702 } 9703 9704 static void nfs4_layoutget_release(void *calldata) 9705 { 9706 struct nfs4_layoutget *lgp = calldata; 9707 9708 nfs4_sequence_free_slot(&lgp->res.seq_res); 9709 pnfs_layoutget_free(lgp); 9710 } 9711 9712 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9713 .rpc_call_prepare = nfs4_layoutget_prepare, 9714 .rpc_call_done = nfs4_layoutget_done, 9715 .rpc_release = nfs4_layoutget_release, 9716 }; 9717 9718 struct pnfs_layout_segment * 9719 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9720 { 9721 struct inode *inode = lgp->args.inode; 9722 struct nfs_server *server = NFS_SERVER(inode); 9723 struct rpc_task *task; 9724 struct rpc_message msg = { 9725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9726 .rpc_argp = &lgp->args, 9727 .rpc_resp = &lgp->res, 9728 .rpc_cred = lgp->cred, 9729 }; 9730 struct rpc_task_setup task_setup_data = { 9731 .rpc_client = server->client, 9732 .rpc_message = &msg, 9733 .callback_ops = &nfs4_layoutget_call_ops, 9734 .callback_data = lgp, 9735 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9736 RPC_TASK_MOVEABLE, 9737 }; 9738 struct pnfs_layout_segment *lseg = NULL; 9739 struct nfs4_exception exception = { 9740 .inode = inode, 9741 .timeout = *timeout, 9742 }; 9743 int status = 0; 9744 9745 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9746 9747 task = rpc_run_task(&task_setup_data); 9748 if (IS_ERR(task)) 9749 return ERR_CAST(task); 9750 9751 status = rpc_wait_for_completion_task(task); 9752 if (status != 0) 9753 goto out; 9754 9755 if (task->tk_status < 0) { 9756 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9757 *timeout = exception.timeout; 9758 } else if (lgp->res.layoutp->len == 0) { 9759 status = -EAGAIN; 9760 *timeout = nfs4_update_delay(&exception.timeout); 9761 } else 9762 lseg = pnfs_layout_process(lgp); 9763 out: 9764 trace_nfs4_layoutget(lgp->args.ctx, 9765 &lgp->args.range, 9766 &lgp->res.range, 9767 &lgp->res.stateid, 9768 status); 9769 9770 rpc_put_task(task); 9771 dprintk("<-- %s status=%d\n", __func__, status); 9772 if (status) 9773 return ERR_PTR(status); 9774 return lseg; 9775 } 9776 9777 static void 9778 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9779 { 9780 struct nfs4_layoutreturn *lrp = calldata; 9781 9782 nfs4_setup_sequence(lrp->clp, 9783 &lrp->args.seq_args, 9784 &lrp->res.seq_res, 9785 task); 9786 if (!pnfs_layout_is_valid(lrp->args.layout)) 9787 rpc_exit(task, 0); 9788 } 9789 9790 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9791 { 9792 struct nfs4_layoutreturn *lrp = calldata; 9793 struct nfs_server *server; 9794 9795 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9796 return; 9797 9798 /* 9799 * Was there an RPC level error? Assume the call succeeded, 9800 * and that we need to release the layout 9801 */ 9802 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9803 lrp->res.lrs_present = 0; 9804 return; 9805 } 9806 9807 server = NFS_SERVER(lrp->args.inode); 9808 switch (task->tk_status) { 9809 case -NFS4ERR_OLD_STATEID: 9810 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9811 &lrp->args.range, 9812 lrp->args.inode)) 9813 goto out_restart; 9814 fallthrough; 9815 default: 9816 task->tk_status = 0; 9817 fallthrough; 9818 case 0: 9819 break; 9820 case -NFS4ERR_DELAY: 9821 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9822 break; 9823 goto out_restart; 9824 } 9825 return; 9826 out_restart: 9827 task->tk_status = 0; 9828 nfs4_sequence_free_slot(&lrp->res.seq_res); 9829 rpc_restart_call_prepare(task); 9830 } 9831 9832 static void nfs4_layoutreturn_release(void *calldata) 9833 { 9834 struct nfs4_layoutreturn *lrp = calldata; 9835 struct pnfs_layout_hdr *lo = lrp->args.layout; 9836 9837 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9838 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9839 nfs4_sequence_free_slot(&lrp->res.seq_res); 9840 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9841 lrp->ld_private.ops->free(&lrp->ld_private); 9842 pnfs_put_layout_hdr(lrp->args.layout); 9843 nfs_iput_and_deactive(lrp->inode); 9844 put_cred(lrp->cred); 9845 kfree(calldata); 9846 } 9847 9848 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9849 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9850 .rpc_call_done = nfs4_layoutreturn_done, 9851 .rpc_release = nfs4_layoutreturn_release, 9852 }; 9853 9854 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9855 { 9856 struct rpc_task *task; 9857 struct rpc_message msg = { 9858 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9859 .rpc_argp = &lrp->args, 9860 .rpc_resp = &lrp->res, 9861 .rpc_cred = lrp->cred, 9862 }; 9863 struct rpc_task_setup task_setup_data = { 9864 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9865 .rpc_message = &msg, 9866 .callback_ops = &nfs4_layoutreturn_call_ops, 9867 .callback_data = lrp, 9868 .flags = RPC_TASK_MOVEABLE, 9869 }; 9870 int status = 0; 9871 9872 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9873 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9874 &task_setup_data.rpc_client, &msg); 9875 9876 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9877 if (!sync) { 9878 if (!lrp->inode) { 9879 nfs4_layoutreturn_release(lrp); 9880 return -EAGAIN; 9881 } 9882 task_setup_data.flags |= RPC_TASK_ASYNC; 9883 } 9884 if (!lrp->inode) 9885 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9886 1); 9887 else 9888 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9889 0); 9890 task = rpc_run_task(&task_setup_data); 9891 if (IS_ERR(task)) 9892 return PTR_ERR(task); 9893 if (sync) 9894 status = task->tk_status; 9895 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9896 dprintk("<-- %s status=%d\n", __func__, status); 9897 rpc_put_task(task); 9898 return status; 9899 } 9900 9901 static int 9902 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9903 struct pnfs_device *pdev, 9904 const struct cred *cred) 9905 { 9906 struct nfs4_getdeviceinfo_args args = { 9907 .pdev = pdev, 9908 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9909 NOTIFY_DEVICEID4_DELETE, 9910 }; 9911 struct nfs4_getdeviceinfo_res res = { 9912 .pdev = pdev, 9913 }; 9914 struct rpc_message msg = { 9915 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9916 .rpc_argp = &args, 9917 .rpc_resp = &res, 9918 .rpc_cred = cred, 9919 }; 9920 int status; 9921 9922 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9923 if (res.notification & ~args.notify_types) 9924 dprintk("%s: unsupported notification\n", __func__); 9925 if (res.notification != args.notify_types) 9926 pdev->nocache = 1; 9927 9928 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9929 9930 dprintk("<-- %s status=%d\n", __func__, status); 9931 9932 return status; 9933 } 9934 9935 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9936 struct pnfs_device *pdev, 9937 const struct cred *cred) 9938 { 9939 struct nfs4_exception exception = { }; 9940 int err; 9941 9942 do { 9943 err = nfs4_handle_exception(server, 9944 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9945 &exception); 9946 } while (exception.retry); 9947 return err; 9948 } 9949 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9950 9951 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9952 { 9953 struct nfs4_layoutcommit_data *data = calldata; 9954 struct nfs_server *server = NFS_SERVER(data->args.inode); 9955 9956 nfs4_setup_sequence(server->nfs_client, 9957 &data->args.seq_args, 9958 &data->res.seq_res, 9959 task); 9960 } 9961 9962 static void 9963 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9964 { 9965 struct nfs4_layoutcommit_data *data = calldata; 9966 struct nfs_server *server = NFS_SERVER(data->args.inode); 9967 9968 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9969 return; 9970 9971 switch (task->tk_status) { /* Just ignore these failures */ 9972 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9973 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9974 case -NFS4ERR_BADLAYOUT: /* no layout */ 9975 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9976 task->tk_status = 0; 9977 break; 9978 case 0: 9979 break; 9980 default: 9981 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9982 rpc_restart_call_prepare(task); 9983 return; 9984 } 9985 } 9986 } 9987 9988 static void nfs4_layoutcommit_release(void *calldata) 9989 { 9990 struct nfs4_layoutcommit_data *data = calldata; 9991 9992 pnfs_cleanup_layoutcommit(data); 9993 nfs_post_op_update_inode_force_wcc(data->args.inode, 9994 data->res.fattr); 9995 put_cred(data->cred); 9996 nfs_iput_and_deactive(data->inode); 9997 kfree(data); 9998 } 9999 10000 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10001 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10002 .rpc_call_done = nfs4_layoutcommit_done, 10003 .rpc_release = nfs4_layoutcommit_release, 10004 }; 10005 10006 int 10007 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10008 { 10009 struct rpc_message msg = { 10010 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10011 .rpc_argp = &data->args, 10012 .rpc_resp = &data->res, 10013 .rpc_cred = data->cred, 10014 }; 10015 struct rpc_task_setup task_setup_data = { 10016 .task = &data->task, 10017 .rpc_client = NFS_CLIENT(data->args.inode), 10018 .rpc_message = &msg, 10019 .callback_ops = &nfs4_layoutcommit_ops, 10020 .callback_data = data, 10021 .flags = RPC_TASK_MOVEABLE, 10022 }; 10023 struct rpc_task *task; 10024 int status = 0; 10025 10026 dprintk("NFS: initiating layoutcommit call. sync %d " 10027 "lbw: %llu inode %lu\n", sync, 10028 data->args.lastbytewritten, 10029 data->args.inode->i_ino); 10030 10031 if (!sync) { 10032 data->inode = nfs_igrab_and_active(data->args.inode); 10033 if (data->inode == NULL) { 10034 nfs4_layoutcommit_release(data); 10035 return -EAGAIN; 10036 } 10037 task_setup_data.flags = RPC_TASK_ASYNC; 10038 } 10039 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10040 task = rpc_run_task(&task_setup_data); 10041 if (IS_ERR(task)) 10042 return PTR_ERR(task); 10043 if (sync) 10044 status = task->tk_status; 10045 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10046 dprintk("%s: status %d\n", __func__, status); 10047 rpc_put_task(task); 10048 return status; 10049 } 10050 10051 /* 10052 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10053 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10054 */ 10055 static int 10056 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10057 struct nfs_fsinfo *info, 10058 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10059 { 10060 struct nfs41_secinfo_no_name_args args = { 10061 .style = SECINFO_STYLE_CURRENT_FH, 10062 }; 10063 struct nfs4_secinfo_res res = { 10064 .flavors = flavors, 10065 }; 10066 struct rpc_message msg = { 10067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10068 .rpc_argp = &args, 10069 .rpc_resp = &res, 10070 }; 10071 struct nfs4_call_sync_data data = { 10072 .seq_server = server, 10073 .seq_args = &args.seq_args, 10074 .seq_res = &res.seq_res, 10075 }; 10076 struct rpc_task_setup task_setup = { 10077 .rpc_client = server->client, 10078 .rpc_message = &msg, 10079 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10080 .callback_data = &data, 10081 .flags = RPC_TASK_NO_ROUND_ROBIN, 10082 }; 10083 const struct cred *cred = NULL; 10084 int status; 10085 10086 if (use_integrity) { 10087 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10088 10089 cred = nfs4_get_clid_cred(server->nfs_client); 10090 msg.rpc_cred = cred; 10091 } 10092 10093 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10094 status = nfs4_call_sync_custom(&task_setup); 10095 dprintk("<-- %s status=%d\n", __func__, status); 10096 10097 put_cred(cred); 10098 10099 return status; 10100 } 10101 10102 static int 10103 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10104 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10105 { 10106 struct nfs4_exception exception = { 10107 .interruptible = true, 10108 }; 10109 int err; 10110 do { 10111 /* first try using integrity protection */ 10112 err = -NFS4ERR_WRONGSEC; 10113 10114 /* try to use integrity protection with machine cred */ 10115 if (_nfs4_is_integrity_protected(server->nfs_client)) 10116 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10117 flavors, true); 10118 10119 /* 10120 * if unable to use integrity protection, or SECINFO with 10121 * integrity protection returns NFS4ERR_WRONGSEC (which is 10122 * disallowed by spec, but exists in deployed servers) use 10123 * the current filesystem's rpc_client and the user cred. 10124 */ 10125 if (err == -NFS4ERR_WRONGSEC) 10126 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10127 flavors, false); 10128 10129 switch (err) { 10130 case 0: 10131 case -NFS4ERR_WRONGSEC: 10132 case -ENOTSUPP: 10133 goto out; 10134 default: 10135 err = nfs4_handle_exception(server, err, &exception); 10136 } 10137 } while (exception.retry); 10138 out: 10139 return err; 10140 } 10141 10142 static int 10143 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10144 struct nfs_fsinfo *info) 10145 { 10146 int err; 10147 struct page *page; 10148 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10149 struct nfs4_secinfo_flavors *flavors; 10150 struct nfs4_secinfo4 *secinfo; 10151 int i; 10152 10153 page = alloc_page(GFP_KERNEL); 10154 if (!page) { 10155 err = -ENOMEM; 10156 goto out; 10157 } 10158 10159 flavors = page_address(page); 10160 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10161 10162 /* 10163 * Fall back on "guess and check" method if 10164 * the server doesn't support SECINFO_NO_NAME 10165 */ 10166 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10167 err = nfs4_find_root_sec(server, fhandle, info); 10168 goto out_freepage; 10169 } 10170 if (err) 10171 goto out_freepage; 10172 10173 for (i = 0; i < flavors->num_flavors; i++) { 10174 secinfo = &flavors->flavors[i]; 10175 10176 switch (secinfo->flavor) { 10177 case RPC_AUTH_NULL: 10178 case RPC_AUTH_UNIX: 10179 case RPC_AUTH_GSS: 10180 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10181 &secinfo->flavor_info); 10182 break; 10183 default: 10184 flavor = RPC_AUTH_MAXFLAVOR; 10185 break; 10186 } 10187 10188 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10189 flavor = RPC_AUTH_MAXFLAVOR; 10190 10191 if (flavor != RPC_AUTH_MAXFLAVOR) { 10192 err = nfs4_lookup_root_sec(server, fhandle, 10193 info, flavor); 10194 if (!err) 10195 break; 10196 } 10197 } 10198 10199 if (flavor == RPC_AUTH_MAXFLAVOR) 10200 err = -EPERM; 10201 10202 out_freepage: 10203 put_page(page); 10204 if (err == -EACCES) 10205 return -EPERM; 10206 out: 10207 return err; 10208 } 10209 10210 static int _nfs41_test_stateid(struct nfs_server *server, 10211 nfs4_stateid *stateid, 10212 const struct cred *cred) 10213 { 10214 int status; 10215 struct nfs41_test_stateid_args args = { 10216 .stateid = stateid, 10217 }; 10218 struct nfs41_test_stateid_res res; 10219 struct rpc_message msg = { 10220 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10221 .rpc_argp = &args, 10222 .rpc_resp = &res, 10223 .rpc_cred = cred, 10224 }; 10225 struct rpc_clnt *rpc_client = server->client; 10226 10227 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10228 &rpc_client, &msg); 10229 10230 dprintk("NFS call test_stateid %p\n", stateid); 10231 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10232 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10233 &args.seq_args, &res.seq_res); 10234 if (status != NFS_OK) { 10235 dprintk("NFS reply test_stateid: failed, %d\n", status); 10236 return status; 10237 } 10238 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10239 return -res.status; 10240 } 10241 10242 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10243 int err, struct nfs4_exception *exception) 10244 { 10245 exception->retry = 0; 10246 switch(err) { 10247 case -NFS4ERR_DELAY: 10248 case -NFS4ERR_RETRY_UNCACHED_REP: 10249 nfs4_handle_exception(server, err, exception); 10250 break; 10251 case -NFS4ERR_BADSESSION: 10252 case -NFS4ERR_BADSLOT: 10253 case -NFS4ERR_BAD_HIGH_SLOT: 10254 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10255 case -NFS4ERR_DEADSESSION: 10256 nfs4_do_handle_exception(server, err, exception); 10257 } 10258 } 10259 10260 /** 10261 * nfs41_test_stateid - perform a TEST_STATEID operation 10262 * 10263 * @server: server / transport on which to perform the operation 10264 * @stateid: state ID to test 10265 * @cred: credential 10266 * 10267 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10268 * Otherwise a negative NFS4ERR value is returned if the operation 10269 * failed or the state ID is not currently valid. 10270 */ 10271 static int nfs41_test_stateid(struct nfs_server *server, 10272 nfs4_stateid *stateid, 10273 const struct cred *cred) 10274 { 10275 struct nfs4_exception exception = { 10276 .interruptible = true, 10277 }; 10278 int err; 10279 do { 10280 err = _nfs41_test_stateid(server, stateid, cred); 10281 nfs4_handle_delay_or_session_error(server, err, &exception); 10282 } while (exception.retry); 10283 return err; 10284 } 10285 10286 struct nfs_free_stateid_data { 10287 struct nfs_server *server; 10288 struct nfs41_free_stateid_args args; 10289 struct nfs41_free_stateid_res res; 10290 }; 10291 10292 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10293 { 10294 struct nfs_free_stateid_data *data = calldata; 10295 nfs4_setup_sequence(data->server->nfs_client, 10296 &data->args.seq_args, 10297 &data->res.seq_res, 10298 task); 10299 } 10300 10301 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10302 { 10303 struct nfs_free_stateid_data *data = calldata; 10304 10305 nfs41_sequence_done(task, &data->res.seq_res); 10306 10307 switch (task->tk_status) { 10308 case -NFS4ERR_DELAY: 10309 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10310 rpc_restart_call_prepare(task); 10311 } 10312 } 10313 10314 static void nfs41_free_stateid_release(void *calldata) 10315 { 10316 struct nfs_free_stateid_data *data = calldata; 10317 struct nfs_client *clp = data->server->nfs_client; 10318 10319 nfs_put_client(clp); 10320 kfree(calldata); 10321 } 10322 10323 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10324 .rpc_call_prepare = nfs41_free_stateid_prepare, 10325 .rpc_call_done = nfs41_free_stateid_done, 10326 .rpc_release = nfs41_free_stateid_release, 10327 }; 10328 10329 /** 10330 * nfs41_free_stateid - perform a FREE_STATEID operation 10331 * 10332 * @server: server / transport on which to perform the operation 10333 * @stateid: state ID to release 10334 * @cred: credential 10335 * @privileged: set to true if this call needs to be privileged 10336 * 10337 * Note: this function is always asynchronous. 10338 */ 10339 static int nfs41_free_stateid(struct nfs_server *server, 10340 const nfs4_stateid *stateid, 10341 const struct cred *cred, 10342 bool privileged) 10343 { 10344 struct rpc_message msg = { 10345 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10346 .rpc_cred = cred, 10347 }; 10348 struct rpc_task_setup task_setup = { 10349 .rpc_client = server->client, 10350 .rpc_message = &msg, 10351 .callback_ops = &nfs41_free_stateid_ops, 10352 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10353 }; 10354 struct nfs_free_stateid_data *data; 10355 struct rpc_task *task; 10356 struct nfs_client *clp = server->nfs_client; 10357 10358 if (!refcount_inc_not_zero(&clp->cl_count)) 10359 return -EIO; 10360 10361 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10362 &task_setup.rpc_client, &msg); 10363 10364 dprintk("NFS call free_stateid %p\n", stateid); 10365 data = kmalloc(sizeof(*data), GFP_KERNEL); 10366 if (!data) 10367 return -ENOMEM; 10368 data->server = server; 10369 nfs4_stateid_copy(&data->args.stateid, stateid); 10370 10371 task_setup.callback_data = data; 10372 10373 msg.rpc_argp = &data->args; 10374 msg.rpc_resp = &data->res; 10375 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10376 task = rpc_run_task(&task_setup); 10377 if (IS_ERR(task)) 10378 return PTR_ERR(task); 10379 rpc_put_task(task); 10380 return 0; 10381 } 10382 10383 static void 10384 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10385 { 10386 const struct cred *cred = lsp->ls_state->owner->so_cred; 10387 10388 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10389 nfs4_free_lock_state(server, lsp); 10390 } 10391 10392 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10393 const nfs4_stateid *s2) 10394 { 10395 if (s1->type != s2->type) 10396 return false; 10397 10398 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10399 return false; 10400 10401 if (s1->seqid == s2->seqid) 10402 return true; 10403 10404 return s1->seqid == 0 || s2->seqid == 0; 10405 } 10406 10407 #endif /* CONFIG_NFS_V4_1 */ 10408 10409 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10410 const nfs4_stateid *s2) 10411 { 10412 return nfs4_stateid_match(s1, s2); 10413 } 10414 10415 10416 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10417 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10418 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10419 .recover_open = nfs4_open_reclaim, 10420 .recover_lock = nfs4_lock_reclaim, 10421 .establish_clid = nfs4_init_clientid, 10422 .detect_trunking = nfs40_discover_server_trunking, 10423 }; 10424 10425 #if defined(CONFIG_NFS_V4_1) 10426 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10427 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10428 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10429 .recover_open = nfs4_open_reclaim, 10430 .recover_lock = nfs4_lock_reclaim, 10431 .establish_clid = nfs41_init_clientid, 10432 .reclaim_complete = nfs41_proc_reclaim_complete, 10433 .detect_trunking = nfs41_discover_server_trunking, 10434 }; 10435 #endif /* CONFIG_NFS_V4_1 */ 10436 10437 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10438 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10439 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10440 .recover_open = nfs40_open_expired, 10441 .recover_lock = nfs4_lock_expired, 10442 .establish_clid = nfs4_init_clientid, 10443 }; 10444 10445 #if defined(CONFIG_NFS_V4_1) 10446 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10447 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10448 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10449 .recover_open = nfs41_open_expired, 10450 .recover_lock = nfs41_lock_expired, 10451 .establish_clid = nfs41_init_clientid, 10452 }; 10453 #endif /* CONFIG_NFS_V4_1 */ 10454 10455 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10456 .sched_state_renewal = nfs4_proc_async_renew, 10457 .get_state_renewal_cred = nfs4_get_renew_cred, 10458 .renew_lease = nfs4_proc_renew, 10459 }; 10460 10461 #if defined(CONFIG_NFS_V4_1) 10462 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10463 .sched_state_renewal = nfs41_proc_async_sequence, 10464 .get_state_renewal_cred = nfs4_get_machine_cred, 10465 .renew_lease = nfs4_proc_sequence, 10466 }; 10467 #endif 10468 10469 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10470 .get_locations = _nfs40_proc_get_locations, 10471 .fsid_present = _nfs40_proc_fsid_present, 10472 }; 10473 10474 #if defined(CONFIG_NFS_V4_1) 10475 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10476 .get_locations = _nfs41_proc_get_locations, 10477 .fsid_present = _nfs41_proc_fsid_present, 10478 }; 10479 #endif /* CONFIG_NFS_V4_1 */ 10480 10481 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10482 .minor_version = 0, 10483 .init_caps = NFS_CAP_READDIRPLUS 10484 | NFS_CAP_ATOMIC_OPEN 10485 | NFS_CAP_POSIX_LOCK, 10486 .init_client = nfs40_init_client, 10487 .shutdown_client = nfs40_shutdown_client, 10488 .match_stateid = nfs4_match_stateid, 10489 .find_root_sec = nfs4_find_root_sec, 10490 .free_lock_state = nfs4_release_lockowner, 10491 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10492 .alloc_seqid = nfs_alloc_seqid, 10493 .call_sync_ops = &nfs40_call_sync_ops, 10494 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10495 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10496 .state_renewal_ops = &nfs40_state_renewal_ops, 10497 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10498 }; 10499 10500 #if defined(CONFIG_NFS_V4_1) 10501 static struct nfs_seqid * 10502 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10503 { 10504 return NULL; 10505 } 10506 10507 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10508 .minor_version = 1, 10509 .init_caps = NFS_CAP_READDIRPLUS 10510 | NFS_CAP_ATOMIC_OPEN 10511 | NFS_CAP_POSIX_LOCK 10512 | NFS_CAP_STATEID_NFSV41 10513 | NFS_CAP_ATOMIC_OPEN_V1 10514 | NFS_CAP_LGOPEN 10515 | NFS_CAP_MOVEABLE, 10516 .init_client = nfs41_init_client, 10517 .shutdown_client = nfs41_shutdown_client, 10518 .match_stateid = nfs41_match_stateid, 10519 .find_root_sec = nfs41_find_root_sec, 10520 .free_lock_state = nfs41_free_lock_state, 10521 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10522 .alloc_seqid = nfs_alloc_no_seqid, 10523 .session_trunk = nfs4_test_session_trunk, 10524 .call_sync_ops = &nfs41_call_sync_ops, 10525 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10526 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10527 .state_renewal_ops = &nfs41_state_renewal_ops, 10528 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10529 }; 10530 #endif 10531 10532 #if defined(CONFIG_NFS_V4_2) 10533 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10534 .minor_version = 2, 10535 .init_caps = NFS_CAP_READDIRPLUS 10536 | NFS_CAP_ATOMIC_OPEN 10537 | NFS_CAP_POSIX_LOCK 10538 | NFS_CAP_STATEID_NFSV41 10539 | NFS_CAP_ATOMIC_OPEN_V1 10540 | NFS_CAP_LGOPEN 10541 | NFS_CAP_ALLOCATE 10542 | NFS_CAP_COPY 10543 | NFS_CAP_OFFLOAD_CANCEL 10544 | NFS_CAP_COPY_NOTIFY 10545 | NFS_CAP_DEALLOCATE 10546 | NFS_CAP_SEEK 10547 | NFS_CAP_LAYOUTSTATS 10548 | NFS_CAP_CLONE 10549 | NFS_CAP_LAYOUTERROR 10550 | NFS_CAP_READ_PLUS 10551 | NFS_CAP_MOVEABLE, 10552 .init_client = nfs41_init_client, 10553 .shutdown_client = nfs41_shutdown_client, 10554 .match_stateid = nfs41_match_stateid, 10555 .find_root_sec = nfs41_find_root_sec, 10556 .free_lock_state = nfs41_free_lock_state, 10557 .call_sync_ops = &nfs41_call_sync_ops, 10558 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10559 .alloc_seqid = nfs_alloc_no_seqid, 10560 .session_trunk = nfs4_test_session_trunk, 10561 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10562 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10563 .state_renewal_ops = &nfs41_state_renewal_ops, 10564 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10565 }; 10566 #endif 10567 10568 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10569 [0] = &nfs_v4_0_minor_ops, 10570 #if defined(CONFIG_NFS_V4_1) 10571 [1] = &nfs_v4_1_minor_ops, 10572 #endif 10573 #if defined(CONFIG_NFS_V4_2) 10574 [2] = &nfs_v4_2_minor_ops, 10575 #endif 10576 }; 10577 10578 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10579 { 10580 ssize_t error, error2, error3; 10581 10582 error = generic_listxattr(dentry, list, size); 10583 if (error < 0) 10584 return error; 10585 if (list) { 10586 list += error; 10587 size -= error; 10588 } 10589 10590 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10591 if (error2 < 0) 10592 return error2; 10593 10594 if (list) { 10595 list += error2; 10596 size -= error2; 10597 } 10598 10599 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10600 if (error3 < 0) 10601 return error3; 10602 10603 return error + error2 + error3; 10604 } 10605 10606 static void nfs4_enable_swap(struct inode *inode) 10607 { 10608 /* The state manager thread must always be running. 10609 * It will notice the client is a swapper, and stay put. 10610 */ 10611 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10612 10613 nfs4_schedule_state_manager(clp); 10614 } 10615 10616 static void nfs4_disable_swap(struct inode *inode) 10617 { 10618 /* The state manager thread will now exit once it is 10619 * woken. 10620 */ 10621 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10622 10623 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10624 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10625 wake_up_var(&clp->cl_state); 10626 } 10627 10628 static const struct inode_operations nfs4_dir_inode_operations = { 10629 .create = nfs_create, 10630 .lookup = nfs_lookup, 10631 .atomic_open = nfs_atomic_open, 10632 .link = nfs_link, 10633 .unlink = nfs_unlink, 10634 .symlink = nfs_symlink, 10635 .mkdir = nfs_mkdir, 10636 .rmdir = nfs_rmdir, 10637 .mknod = nfs_mknod, 10638 .rename = nfs_rename, 10639 .permission = nfs_permission, 10640 .getattr = nfs_getattr, 10641 .setattr = nfs_setattr, 10642 .listxattr = nfs4_listxattr, 10643 }; 10644 10645 static const struct inode_operations nfs4_file_inode_operations = { 10646 .permission = nfs_permission, 10647 .getattr = nfs_getattr, 10648 .setattr = nfs_setattr, 10649 .listxattr = nfs4_listxattr, 10650 }; 10651 10652 const struct nfs_rpc_ops nfs_v4_clientops = { 10653 .version = 4, /* protocol version */ 10654 .dentry_ops = &nfs4_dentry_operations, 10655 .dir_inode_ops = &nfs4_dir_inode_operations, 10656 .file_inode_ops = &nfs4_file_inode_operations, 10657 .file_ops = &nfs4_file_operations, 10658 .getroot = nfs4_proc_get_root, 10659 .submount = nfs4_submount, 10660 .try_get_tree = nfs4_try_get_tree, 10661 .getattr = nfs4_proc_getattr, 10662 .setattr = nfs4_proc_setattr, 10663 .lookup = nfs4_proc_lookup, 10664 .lookupp = nfs4_proc_lookupp, 10665 .access = nfs4_proc_access, 10666 .readlink = nfs4_proc_readlink, 10667 .create = nfs4_proc_create, 10668 .remove = nfs4_proc_remove, 10669 .unlink_setup = nfs4_proc_unlink_setup, 10670 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10671 .unlink_done = nfs4_proc_unlink_done, 10672 .rename_setup = nfs4_proc_rename_setup, 10673 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10674 .rename_done = nfs4_proc_rename_done, 10675 .link = nfs4_proc_link, 10676 .symlink = nfs4_proc_symlink, 10677 .mkdir = nfs4_proc_mkdir, 10678 .rmdir = nfs4_proc_rmdir, 10679 .readdir = nfs4_proc_readdir, 10680 .mknod = nfs4_proc_mknod, 10681 .statfs = nfs4_proc_statfs, 10682 .fsinfo = nfs4_proc_fsinfo, 10683 .pathconf = nfs4_proc_pathconf, 10684 .set_capabilities = nfs4_server_capabilities, 10685 .decode_dirent = nfs4_decode_dirent, 10686 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10687 .read_setup = nfs4_proc_read_setup, 10688 .read_done = nfs4_read_done, 10689 .write_setup = nfs4_proc_write_setup, 10690 .write_done = nfs4_write_done, 10691 .commit_setup = nfs4_proc_commit_setup, 10692 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10693 .commit_done = nfs4_commit_done, 10694 .lock = nfs4_proc_lock, 10695 .clear_acl_cache = nfs4_zap_acl_attr, 10696 .close_context = nfs4_close_context, 10697 .open_context = nfs4_atomic_open, 10698 .have_delegation = nfs4_have_delegation, 10699 .alloc_client = nfs4_alloc_client, 10700 .init_client = nfs4_init_client, 10701 .free_client = nfs4_free_client, 10702 .create_server = nfs4_create_server, 10703 .clone_server = nfs_clone_server, 10704 .discover_trunking = nfs4_discover_trunking, 10705 .enable_swap = nfs4_enable_swap, 10706 .disable_swap = nfs4_disable_swap, 10707 }; 10708 10709 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10710 .name = XATTR_NAME_NFSV4_ACL, 10711 .list = nfs4_xattr_list_nfs4_acl, 10712 .get = nfs4_xattr_get_nfs4_acl, 10713 .set = nfs4_xattr_set_nfs4_acl, 10714 }; 10715 10716 #if defined(CONFIG_NFS_V4_1) 10717 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10718 .name = XATTR_NAME_NFSV4_DACL, 10719 .list = nfs4_xattr_list_nfs4_dacl, 10720 .get = nfs4_xattr_get_nfs4_dacl, 10721 .set = nfs4_xattr_set_nfs4_dacl, 10722 }; 10723 10724 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10725 .name = XATTR_NAME_NFSV4_SACL, 10726 .list = nfs4_xattr_list_nfs4_sacl, 10727 .get = nfs4_xattr_get_nfs4_sacl, 10728 .set = nfs4_xattr_set_nfs4_sacl, 10729 }; 10730 #endif 10731 10732 #ifdef CONFIG_NFS_V4_2 10733 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10734 .prefix = XATTR_USER_PREFIX, 10735 .get = nfs4_xattr_get_nfs4_user, 10736 .set = nfs4_xattr_set_nfs4_user, 10737 }; 10738 #endif 10739 10740 const struct xattr_handler *nfs4_xattr_handlers[] = { 10741 &nfs4_xattr_nfs4_acl_handler, 10742 #if defined(CONFIG_NFS_V4_1) 10743 &nfs4_xattr_nfs4_dacl_handler, 10744 &nfs4_xattr_nfs4_sacl_handler, 10745 #endif 10746 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10747 &nfs4_xattr_nfs4_label_handler, 10748 #endif 10749 #ifdef CONFIG_NFS_V4_2 10750 &nfs4_xattr_nfs4_user_handler, 10751 #endif 10752 NULL 10753 }; 10754