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 nfs4_sequence_free_slot(&o_res->seq_res); 2707 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL); 2708 } 2709 return 0; 2710 } 2711 2712 /* 2713 * OPEN_EXPIRED: 2714 * reclaim state on the server after a network partition. 2715 * Assumes caller holds the appropriate lock 2716 */ 2717 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2718 { 2719 struct nfs4_opendata *opendata; 2720 int ret; 2721 2722 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2723 if (IS_ERR(opendata)) 2724 return PTR_ERR(opendata); 2725 /* 2726 * We're not recovering a delegation, so ask for no delegation. 2727 * Otherwise the recovery thread could deadlock with an outstanding 2728 * delegation return. 2729 */ 2730 opendata->o_arg.open_flags = O_DIRECT; 2731 ret = nfs4_open_recover(opendata, state); 2732 if (ret == -ESTALE) 2733 d_drop(ctx->dentry); 2734 nfs4_opendata_put(opendata); 2735 return ret; 2736 } 2737 2738 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2739 { 2740 struct nfs_server *server = NFS_SERVER(state->inode); 2741 struct nfs4_exception exception = { }; 2742 int err; 2743 2744 do { 2745 err = _nfs4_open_expired(ctx, state); 2746 trace_nfs4_open_expired(ctx, 0, err); 2747 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2748 continue; 2749 switch (err) { 2750 default: 2751 goto out; 2752 case -NFS4ERR_GRACE: 2753 case -NFS4ERR_DELAY: 2754 nfs4_handle_exception(server, err, &exception); 2755 err = 0; 2756 } 2757 } while (exception.retry); 2758 out: 2759 return err; 2760 } 2761 2762 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2763 { 2764 struct nfs_open_context *ctx; 2765 int ret; 2766 2767 ctx = nfs4_state_find_open_context(state); 2768 if (IS_ERR(ctx)) 2769 return -EAGAIN; 2770 ret = nfs4_do_open_expired(ctx, state); 2771 put_nfs_open_context(ctx); 2772 return ret; 2773 } 2774 2775 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2776 const nfs4_stateid *stateid) 2777 { 2778 nfs_remove_bad_delegation(state->inode, stateid); 2779 nfs_state_clear_delegation(state); 2780 } 2781 2782 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2783 { 2784 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2785 nfs_finish_clear_delegation_stateid(state, NULL); 2786 } 2787 2788 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2789 { 2790 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2791 nfs40_clear_delegation_stateid(state); 2792 nfs_state_clear_open_state_flags(state); 2793 return nfs4_open_expired(sp, state); 2794 } 2795 2796 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2797 nfs4_stateid *stateid, 2798 const struct cred *cred) 2799 { 2800 return -NFS4ERR_BAD_STATEID; 2801 } 2802 2803 #if defined(CONFIG_NFS_V4_1) 2804 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2805 nfs4_stateid *stateid, 2806 const struct cred *cred) 2807 { 2808 int status; 2809 2810 switch (stateid->type) { 2811 default: 2812 break; 2813 case NFS4_INVALID_STATEID_TYPE: 2814 case NFS4_SPECIAL_STATEID_TYPE: 2815 return -NFS4ERR_BAD_STATEID; 2816 case NFS4_REVOKED_STATEID_TYPE: 2817 goto out_free; 2818 } 2819 2820 status = nfs41_test_stateid(server, stateid, cred); 2821 switch (status) { 2822 case -NFS4ERR_EXPIRED: 2823 case -NFS4ERR_ADMIN_REVOKED: 2824 case -NFS4ERR_DELEG_REVOKED: 2825 break; 2826 default: 2827 return status; 2828 } 2829 out_free: 2830 /* Ack the revoked state to the server */ 2831 nfs41_free_stateid(server, stateid, cred, true); 2832 return -NFS4ERR_EXPIRED; 2833 } 2834 2835 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2836 { 2837 struct nfs_server *server = NFS_SERVER(state->inode); 2838 nfs4_stateid stateid; 2839 struct nfs_delegation *delegation; 2840 const struct cred *cred = NULL; 2841 int status, ret = NFS_OK; 2842 2843 /* Get the delegation credential for use by test/free_stateid */ 2844 rcu_read_lock(); 2845 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2846 if (delegation == NULL) { 2847 rcu_read_unlock(); 2848 nfs_state_clear_delegation(state); 2849 return NFS_OK; 2850 } 2851 2852 spin_lock(&delegation->lock); 2853 nfs4_stateid_copy(&stateid, &delegation->stateid); 2854 2855 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2856 &delegation->flags)) { 2857 spin_unlock(&delegation->lock); 2858 rcu_read_unlock(); 2859 return NFS_OK; 2860 } 2861 2862 if (delegation->cred) 2863 cred = get_cred(delegation->cred); 2864 spin_unlock(&delegation->lock); 2865 rcu_read_unlock(); 2866 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2867 trace_nfs4_test_delegation_stateid(state, NULL, status); 2868 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2869 nfs_finish_clear_delegation_stateid(state, &stateid); 2870 else 2871 ret = status; 2872 2873 put_cred(cred); 2874 return ret; 2875 } 2876 2877 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2878 { 2879 nfs4_stateid tmp; 2880 2881 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2882 nfs4_copy_delegation_stateid(state->inode, state->state, 2883 &tmp, NULL) && 2884 nfs4_stateid_match_other(&state->stateid, &tmp)) 2885 nfs_state_set_delegation(state, &tmp, state->state); 2886 else 2887 nfs_state_clear_delegation(state); 2888 } 2889 2890 /** 2891 * nfs41_check_expired_locks - possibly free a lock stateid 2892 * 2893 * @state: NFSv4 state for an inode 2894 * 2895 * Returns NFS_OK if recovery for this stateid is now finished. 2896 * Otherwise a negative NFS4ERR value is returned. 2897 */ 2898 static int nfs41_check_expired_locks(struct nfs4_state *state) 2899 { 2900 int status, ret = NFS_OK; 2901 struct nfs4_lock_state *lsp, *prev = NULL; 2902 struct nfs_server *server = NFS_SERVER(state->inode); 2903 2904 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2905 goto out; 2906 2907 spin_lock(&state->state_lock); 2908 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2909 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2910 const struct cred *cred = lsp->ls_state->owner->so_cred; 2911 2912 refcount_inc(&lsp->ls_count); 2913 spin_unlock(&state->state_lock); 2914 2915 nfs4_put_lock_state(prev); 2916 prev = lsp; 2917 2918 status = nfs41_test_and_free_expired_stateid(server, 2919 &lsp->ls_stateid, 2920 cred); 2921 trace_nfs4_test_lock_stateid(state, lsp, status); 2922 if (status == -NFS4ERR_EXPIRED || 2923 status == -NFS4ERR_BAD_STATEID) { 2924 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2925 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2926 if (!recover_lost_locks) 2927 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2928 } else if (status != NFS_OK) { 2929 ret = status; 2930 nfs4_put_lock_state(prev); 2931 goto out; 2932 } 2933 spin_lock(&state->state_lock); 2934 } 2935 } 2936 spin_unlock(&state->state_lock); 2937 nfs4_put_lock_state(prev); 2938 out: 2939 return ret; 2940 } 2941 2942 /** 2943 * nfs41_check_open_stateid - possibly free an open stateid 2944 * 2945 * @state: NFSv4 state for an inode 2946 * 2947 * Returns NFS_OK if recovery for this stateid is now finished. 2948 * Otherwise a negative NFS4ERR value is returned. 2949 */ 2950 static int nfs41_check_open_stateid(struct nfs4_state *state) 2951 { 2952 struct nfs_server *server = NFS_SERVER(state->inode); 2953 nfs4_stateid *stateid = &state->open_stateid; 2954 const struct cred *cred = state->owner->so_cred; 2955 int status; 2956 2957 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2958 return -NFS4ERR_BAD_STATEID; 2959 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2960 trace_nfs4_test_open_stateid(state, NULL, status); 2961 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2962 nfs_state_clear_open_state_flags(state); 2963 stateid->type = NFS4_INVALID_STATEID_TYPE; 2964 return status; 2965 } 2966 if (nfs_open_stateid_recover_openmode(state)) 2967 return -NFS4ERR_OPENMODE; 2968 return NFS_OK; 2969 } 2970 2971 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2972 { 2973 int status; 2974 2975 status = nfs41_check_delegation_stateid(state); 2976 if (status != NFS_OK) 2977 return status; 2978 nfs41_delegation_recover_stateid(state); 2979 2980 status = nfs41_check_expired_locks(state); 2981 if (status != NFS_OK) 2982 return status; 2983 status = nfs41_check_open_stateid(state); 2984 if (status != NFS_OK) 2985 status = nfs4_open_expired(sp, state); 2986 return status; 2987 } 2988 #endif 2989 2990 /* 2991 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2992 * fields corresponding to attributes that were used to store the verifier. 2993 * Make sure we clobber those fields in the later setattr call 2994 */ 2995 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2996 struct iattr *sattr, struct nfs4_label **label) 2997 { 2998 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2999 __u32 attrset[3]; 3000 unsigned ret; 3001 unsigned i; 3002 3003 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3004 attrset[i] = opendata->o_res.attrset[i]; 3005 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3006 attrset[i] &= ~bitmask[i]; 3007 } 3008 3009 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3010 sattr->ia_valid : 0; 3011 3012 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3013 if (sattr->ia_valid & ATTR_ATIME_SET) 3014 ret |= ATTR_ATIME_SET; 3015 else 3016 ret |= ATTR_ATIME; 3017 } 3018 3019 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3020 if (sattr->ia_valid & ATTR_MTIME_SET) 3021 ret |= ATTR_MTIME_SET; 3022 else 3023 ret |= ATTR_MTIME; 3024 } 3025 3026 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3027 *label = NULL; 3028 return ret; 3029 } 3030 3031 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3032 struct nfs_open_context *ctx) 3033 { 3034 struct nfs4_state_owner *sp = opendata->owner; 3035 struct nfs_server *server = sp->so_server; 3036 struct dentry *dentry; 3037 struct nfs4_state *state; 3038 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3039 struct inode *dir = d_inode(opendata->dir); 3040 unsigned long dir_verifier; 3041 unsigned int seq; 3042 int ret; 3043 3044 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3045 dir_verifier = nfs_save_change_attribute(dir); 3046 3047 ret = _nfs4_proc_open(opendata, ctx); 3048 if (ret != 0) 3049 goto out; 3050 3051 state = _nfs4_opendata_to_nfs4_state(opendata); 3052 ret = PTR_ERR(state); 3053 if (IS_ERR(state)) 3054 goto out; 3055 ctx->state = state; 3056 if (server->caps & NFS_CAP_POSIX_LOCK) 3057 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3058 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3059 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3060 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3061 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3062 3063 dentry = opendata->dentry; 3064 if (d_really_is_negative(dentry)) { 3065 struct dentry *alias; 3066 d_drop(dentry); 3067 alias = d_exact_alias(dentry, state->inode); 3068 if (!alias) 3069 alias = d_splice_alias(igrab(state->inode), dentry); 3070 /* d_splice_alias() can't fail here - it's a non-directory */ 3071 if (alias) { 3072 dput(ctx->dentry); 3073 ctx->dentry = dentry = alias; 3074 } 3075 } 3076 3077 switch(opendata->o_arg.claim) { 3078 default: 3079 break; 3080 case NFS4_OPEN_CLAIM_NULL: 3081 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3082 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3083 if (!opendata->rpc_done) 3084 break; 3085 if (opendata->o_res.delegation_type != 0) 3086 dir_verifier = nfs_save_change_attribute(dir); 3087 nfs_set_verifier(dentry, dir_verifier); 3088 } 3089 3090 /* Parse layoutget results before we check for access */ 3091 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3092 3093 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3094 if (ret != 0) 3095 goto out; 3096 3097 if (d_inode(dentry) == state->inode) { 3098 nfs_inode_attach_open_context(ctx); 3099 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3100 nfs4_schedule_stateid_recovery(server, state); 3101 } 3102 3103 out: 3104 if (!opendata->cancelled) { 3105 if (opendata->lgp) { 3106 nfs4_lgopen_release(opendata->lgp); 3107 opendata->lgp = NULL; 3108 } 3109 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3110 } 3111 return ret; 3112 } 3113 3114 /* 3115 * Returns a referenced nfs4_state 3116 */ 3117 static int _nfs4_do_open(struct inode *dir, 3118 struct nfs_open_context *ctx, 3119 int flags, 3120 const struct nfs4_open_createattrs *c, 3121 int *opened) 3122 { 3123 struct nfs4_state_owner *sp; 3124 struct nfs4_state *state = NULL; 3125 struct nfs_server *server = NFS_SERVER(dir); 3126 struct nfs4_opendata *opendata; 3127 struct dentry *dentry = ctx->dentry; 3128 const struct cred *cred = ctx->cred; 3129 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3130 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3131 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3132 struct iattr *sattr = c->sattr; 3133 struct nfs4_label *label = c->label; 3134 int status; 3135 3136 /* Protect against reboot recovery conflicts */ 3137 status = -ENOMEM; 3138 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3139 if (sp == NULL) { 3140 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3141 goto out_err; 3142 } 3143 status = nfs4_client_recover_expired_lease(server->nfs_client); 3144 if (status != 0) 3145 goto err_put_state_owner; 3146 if (d_really_is_positive(dentry)) 3147 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3148 status = -ENOMEM; 3149 if (d_really_is_positive(dentry)) 3150 claim = NFS4_OPEN_CLAIM_FH; 3151 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3152 c, claim, GFP_KERNEL); 3153 if (opendata == NULL) 3154 goto err_put_state_owner; 3155 3156 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3157 if (!opendata->f_attr.mdsthreshold) { 3158 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3159 if (!opendata->f_attr.mdsthreshold) 3160 goto err_opendata_put; 3161 } 3162 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3163 } 3164 if (d_really_is_positive(dentry)) 3165 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3166 3167 status = _nfs4_open_and_get_state(opendata, ctx); 3168 if (status != 0) 3169 goto err_opendata_put; 3170 state = ctx->state; 3171 3172 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3173 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3174 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3175 /* 3176 * send create attributes which was not set by open 3177 * with an extra setattr. 3178 */ 3179 if (attrs || label) { 3180 unsigned ia_old = sattr->ia_valid; 3181 3182 sattr->ia_valid = attrs; 3183 nfs_fattr_init(opendata->o_res.f_attr); 3184 status = nfs4_do_setattr(state->inode, cred, 3185 opendata->o_res.f_attr, sattr, 3186 ctx, label); 3187 if (status == 0) { 3188 nfs_setattr_update_inode(state->inode, sattr, 3189 opendata->o_res.f_attr); 3190 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3191 } 3192 sattr->ia_valid = ia_old; 3193 } 3194 } 3195 if (opened && opendata->file_created) 3196 *opened = 1; 3197 3198 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3199 *ctx_th = opendata->f_attr.mdsthreshold; 3200 opendata->f_attr.mdsthreshold = NULL; 3201 } 3202 3203 nfs4_opendata_put(opendata); 3204 nfs4_put_state_owner(sp); 3205 return 0; 3206 err_opendata_put: 3207 nfs4_opendata_put(opendata); 3208 err_put_state_owner: 3209 nfs4_put_state_owner(sp); 3210 out_err: 3211 return status; 3212 } 3213 3214 3215 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3216 struct nfs_open_context *ctx, 3217 int flags, 3218 struct iattr *sattr, 3219 struct nfs4_label *label, 3220 int *opened) 3221 { 3222 struct nfs_server *server = NFS_SERVER(dir); 3223 struct nfs4_exception exception = { 3224 .interruptible = true, 3225 }; 3226 struct nfs4_state *res; 3227 struct nfs4_open_createattrs c = { 3228 .label = label, 3229 .sattr = sattr, 3230 .verf = { 3231 [0] = (__u32)jiffies, 3232 [1] = (__u32)current->pid, 3233 }, 3234 }; 3235 int status; 3236 3237 do { 3238 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3239 res = ctx->state; 3240 trace_nfs4_open_file(ctx, flags, status); 3241 if (status == 0) 3242 break; 3243 /* NOTE: BAD_SEQID means the server and client disagree about the 3244 * book-keeping w.r.t. state-changing operations 3245 * (OPEN/CLOSE/LOCK/LOCKU...) 3246 * It is actually a sign of a bug on the client or on the server. 3247 * 3248 * If we receive a BAD_SEQID error in the particular case of 3249 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3250 * have unhashed the old state_owner for us, and that we can 3251 * therefore safely retry using a new one. We should still warn 3252 * the user though... 3253 */ 3254 if (status == -NFS4ERR_BAD_SEQID) { 3255 pr_warn_ratelimited("NFS: v4 server %s " 3256 " returned a bad sequence-id error!\n", 3257 NFS_SERVER(dir)->nfs_client->cl_hostname); 3258 exception.retry = 1; 3259 continue; 3260 } 3261 /* 3262 * BAD_STATEID on OPEN means that the server cancelled our 3263 * state before it received the OPEN_CONFIRM. 3264 * Recover by retrying the request as per the discussion 3265 * on Page 181 of RFC3530. 3266 */ 3267 if (status == -NFS4ERR_BAD_STATEID) { 3268 exception.retry = 1; 3269 continue; 3270 } 3271 if (status == -NFS4ERR_EXPIRED) { 3272 nfs4_schedule_lease_recovery(server->nfs_client); 3273 exception.retry = 1; 3274 continue; 3275 } 3276 if (status == -EAGAIN) { 3277 /* We must have found a delegation */ 3278 exception.retry = 1; 3279 continue; 3280 } 3281 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3282 continue; 3283 res = ERR_PTR(nfs4_handle_exception(server, 3284 status, &exception)); 3285 } while (exception.retry); 3286 return res; 3287 } 3288 3289 static int _nfs4_do_setattr(struct inode *inode, 3290 struct nfs_setattrargs *arg, 3291 struct nfs_setattrres *res, 3292 const struct cred *cred, 3293 struct nfs_open_context *ctx) 3294 { 3295 struct nfs_server *server = NFS_SERVER(inode); 3296 struct rpc_message msg = { 3297 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3298 .rpc_argp = arg, 3299 .rpc_resp = res, 3300 .rpc_cred = cred, 3301 }; 3302 const struct cred *delegation_cred = NULL; 3303 unsigned long timestamp = jiffies; 3304 bool truncate; 3305 int status; 3306 3307 nfs_fattr_init(res->fattr); 3308 3309 /* Servers should only apply open mode checks for file size changes */ 3310 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3311 if (!truncate) { 3312 nfs4_inode_make_writeable(inode); 3313 goto zero_stateid; 3314 } 3315 3316 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3317 /* Use that stateid */ 3318 } else if (ctx != NULL && ctx->state) { 3319 struct nfs_lock_context *l_ctx; 3320 if (!nfs4_valid_open_stateid(ctx->state)) 3321 return -EBADF; 3322 l_ctx = nfs_get_lock_context(ctx); 3323 if (IS_ERR(l_ctx)) 3324 return PTR_ERR(l_ctx); 3325 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3326 &arg->stateid, &delegation_cred); 3327 nfs_put_lock_context(l_ctx); 3328 if (status == -EIO) 3329 return -EBADF; 3330 else if (status == -EAGAIN) 3331 goto zero_stateid; 3332 } else { 3333 zero_stateid: 3334 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3335 } 3336 if (delegation_cred) 3337 msg.rpc_cred = delegation_cred; 3338 3339 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3340 3341 put_cred(delegation_cred); 3342 if (status == 0 && ctx != NULL) 3343 renew_lease(server, timestamp); 3344 trace_nfs4_setattr(inode, &arg->stateid, status); 3345 return status; 3346 } 3347 3348 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3349 struct nfs_fattr *fattr, struct iattr *sattr, 3350 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3351 { 3352 struct nfs_server *server = NFS_SERVER(inode); 3353 __u32 bitmask[NFS4_BITMASK_SZ]; 3354 struct nfs4_state *state = ctx ? ctx->state : NULL; 3355 struct nfs_setattrargs arg = { 3356 .fh = NFS_FH(inode), 3357 .iap = sattr, 3358 .server = server, 3359 .bitmask = bitmask, 3360 .label = ilabel, 3361 }; 3362 struct nfs_setattrres res = { 3363 .fattr = fattr, 3364 .server = server, 3365 }; 3366 struct nfs4_exception exception = { 3367 .state = state, 3368 .inode = inode, 3369 .stateid = &arg.stateid, 3370 }; 3371 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3372 int err; 3373 3374 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3375 adjust_flags |= NFS_INO_INVALID_MODE; 3376 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3377 adjust_flags |= NFS_INO_INVALID_OTHER; 3378 3379 do { 3380 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3381 inode, adjust_flags); 3382 3383 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3384 switch (err) { 3385 case -NFS4ERR_OPENMODE: 3386 if (!(sattr->ia_valid & ATTR_SIZE)) { 3387 pr_warn_once("NFSv4: server %s is incorrectly " 3388 "applying open mode checks to " 3389 "a SETATTR that is not " 3390 "changing file size.\n", 3391 server->nfs_client->cl_hostname); 3392 } 3393 if (state && !(state->state & FMODE_WRITE)) { 3394 err = -EBADF; 3395 if (sattr->ia_valid & ATTR_OPEN) 3396 err = -EACCES; 3397 goto out; 3398 } 3399 } 3400 err = nfs4_handle_exception(server, err, &exception); 3401 } while (exception.retry); 3402 out: 3403 return err; 3404 } 3405 3406 static bool 3407 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3408 { 3409 if (inode == NULL || !nfs_have_layout(inode)) 3410 return false; 3411 3412 return pnfs_wait_on_layoutreturn(inode, task); 3413 } 3414 3415 /* 3416 * Update the seqid of an open stateid 3417 */ 3418 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3419 struct nfs4_state *state) 3420 { 3421 __be32 seqid_open; 3422 u32 dst_seqid; 3423 int seq; 3424 3425 for (;;) { 3426 if (!nfs4_valid_open_stateid(state)) 3427 break; 3428 seq = read_seqbegin(&state->seqlock); 3429 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3430 nfs4_stateid_copy(dst, &state->open_stateid); 3431 if (read_seqretry(&state->seqlock, seq)) 3432 continue; 3433 break; 3434 } 3435 seqid_open = state->open_stateid.seqid; 3436 if (read_seqretry(&state->seqlock, seq)) 3437 continue; 3438 3439 dst_seqid = be32_to_cpu(dst->seqid); 3440 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3441 dst->seqid = seqid_open; 3442 break; 3443 } 3444 } 3445 3446 /* 3447 * Update the seqid of an open stateid after receiving 3448 * NFS4ERR_OLD_STATEID 3449 */ 3450 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3451 struct nfs4_state *state) 3452 { 3453 __be32 seqid_open; 3454 u32 dst_seqid; 3455 bool ret; 3456 int seq, status = -EAGAIN; 3457 DEFINE_WAIT(wait); 3458 3459 for (;;) { 3460 ret = false; 3461 if (!nfs4_valid_open_stateid(state)) 3462 break; 3463 seq = read_seqbegin(&state->seqlock); 3464 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3465 if (read_seqretry(&state->seqlock, seq)) 3466 continue; 3467 break; 3468 } 3469 3470 write_seqlock(&state->seqlock); 3471 seqid_open = state->open_stateid.seqid; 3472 3473 dst_seqid = be32_to_cpu(dst->seqid); 3474 3475 /* Did another OPEN bump the state's seqid? try again: */ 3476 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3477 dst->seqid = seqid_open; 3478 write_sequnlock(&state->seqlock); 3479 ret = true; 3480 break; 3481 } 3482 3483 /* server says we're behind but we haven't seen the update yet */ 3484 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3485 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3486 write_sequnlock(&state->seqlock); 3487 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3488 3489 if (fatal_signal_pending(current)) 3490 status = -EINTR; 3491 else 3492 if (schedule_timeout(5*HZ) != 0) 3493 status = 0; 3494 3495 finish_wait(&state->waitq, &wait); 3496 3497 if (!status) 3498 continue; 3499 if (status == -EINTR) 3500 break; 3501 3502 /* we slept the whole 5 seconds, we must have lost a seqid */ 3503 dst->seqid = cpu_to_be32(dst_seqid + 1); 3504 ret = true; 3505 break; 3506 } 3507 3508 return ret; 3509 } 3510 3511 struct nfs4_closedata { 3512 struct inode *inode; 3513 struct nfs4_state *state; 3514 struct nfs_closeargs arg; 3515 struct nfs_closeres res; 3516 struct { 3517 struct nfs4_layoutreturn_args arg; 3518 struct nfs4_layoutreturn_res res; 3519 struct nfs4_xdr_opaque_data ld_private; 3520 u32 roc_barrier; 3521 bool roc; 3522 } lr; 3523 struct nfs_fattr fattr; 3524 unsigned long timestamp; 3525 }; 3526 3527 static void nfs4_free_closedata(void *data) 3528 { 3529 struct nfs4_closedata *calldata = data; 3530 struct nfs4_state_owner *sp = calldata->state->owner; 3531 struct super_block *sb = calldata->state->inode->i_sb; 3532 3533 if (calldata->lr.roc) 3534 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3535 calldata->res.lr_ret); 3536 nfs4_put_open_state(calldata->state); 3537 nfs_free_seqid(calldata->arg.seqid); 3538 nfs4_put_state_owner(sp); 3539 nfs_sb_deactive(sb); 3540 kfree(calldata); 3541 } 3542 3543 static void nfs4_close_done(struct rpc_task *task, void *data) 3544 { 3545 struct nfs4_closedata *calldata = data; 3546 struct nfs4_state *state = calldata->state; 3547 struct nfs_server *server = NFS_SERVER(calldata->inode); 3548 nfs4_stateid *res_stateid = NULL; 3549 struct nfs4_exception exception = { 3550 .state = state, 3551 .inode = calldata->inode, 3552 .stateid = &calldata->arg.stateid, 3553 }; 3554 3555 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3556 return; 3557 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3558 3559 /* Handle Layoutreturn errors */ 3560 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3561 &calldata->res.lr_ret) == -EAGAIN) 3562 goto out_restart; 3563 3564 /* hmm. we are done with the inode, and in the process of freeing 3565 * the state_owner. we keep this around to process errors 3566 */ 3567 switch (task->tk_status) { 3568 case 0: 3569 res_stateid = &calldata->res.stateid; 3570 renew_lease(server, calldata->timestamp); 3571 break; 3572 case -NFS4ERR_ACCESS: 3573 if (calldata->arg.bitmask != NULL) { 3574 calldata->arg.bitmask = NULL; 3575 calldata->res.fattr = NULL; 3576 goto out_restart; 3577 3578 } 3579 break; 3580 case -NFS4ERR_OLD_STATEID: 3581 /* Did we race with OPEN? */ 3582 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3583 state)) 3584 goto out_restart; 3585 goto out_release; 3586 case -NFS4ERR_ADMIN_REVOKED: 3587 case -NFS4ERR_STALE_STATEID: 3588 case -NFS4ERR_EXPIRED: 3589 nfs4_free_revoked_stateid(server, 3590 &calldata->arg.stateid, 3591 task->tk_msg.rpc_cred); 3592 fallthrough; 3593 case -NFS4ERR_BAD_STATEID: 3594 if (calldata->arg.fmode == 0) 3595 break; 3596 fallthrough; 3597 default: 3598 task->tk_status = nfs4_async_handle_exception(task, 3599 server, task->tk_status, &exception); 3600 if (exception.retry) 3601 goto out_restart; 3602 } 3603 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3604 res_stateid, calldata->arg.fmode); 3605 out_release: 3606 task->tk_status = 0; 3607 nfs_release_seqid(calldata->arg.seqid); 3608 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3609 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3610 return; 3611 out_restart: 3612 task->tk_status = 0; 3613 rpc_restart_call_prepare(task); 3614 goto out_release; 3615 } 3616 3617 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3618 { 3619 struct nfs4_closedata *calldata = data; 3620 struct nfs4_state *state = calldata->state; 3621 struct inode *inode = calldata->inode; 3622 struct nfs_server *server = NFS_SERVER(inode); 3623 struct pnfs_layout_hdr *lo; 3624 bool is_rdonly, is_wronly, is_rdwr; 3625 int call_close = 0; 3626 3627 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3628 goto out_wait; 3629 3630 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3631 spin_lock(&state->owner->so_lock); 3632 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3633 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3634 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3635 /* Calculate the change in open mode */ 3636 calldata->arg.fmode = 0; 3637 if (state->n_rdwr == 0) { 3638 if (state->n_rdonly == 0) 3639 call_close |= is_rdonly; 3640 else if (is_rdonly) 3641 calldata->arg.fmode |= FMODE_READ; 3642 if (state->n_wronly == 0) 3643 call_close |= is_wronly; 3644 else if (is_wronly) 3645 calldata->arg.fmode |= FMODE_WRITE; 3646 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3647 call_close |= is_rdwr; 3648 } else if (is_rdwr) 3649 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3650 3651 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3652 if (!nfs4_valid_open_stateid(state)) 3653 call_close = 0; 3654 spin_unlock(&state->owner->so_lock); 3655 3656 if (!call_close) { 3657 /* Note: exit _without_ calling nfs4_close_done */ 3658 goto out_no_action; 3659 } 3660 3661 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3662 nfs_release_seqid(calldata->arg.seqid); 3663 goto out_wait; 3664 } 3665 3666 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3667 if (lo && !pnfs_layout_is_valid(lo)) { 3668 calldata->arg.lr_args = NULL; 3669 calldata->res.lr_res = NULL; 3670 } 3671 3672 if (calldata->arg.fmode == 0) 3673 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3674 3675 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3676 /* Close-to-open cache consistency revalidation */ 3677 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3678 nfs4_bitmask_set(calldata->arg.bitmask_store, 3679 server->cache_consistency_bitmask, 3680 inode, 0); 3681 calldata->arg.bitmask = calldata->arg.bitmask_store; 3682 } else 3683 calldata->arg.bitmask = NULL; 3684 } 3685 3686 calldata->arg.share_access = 3687 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3688 calldata->arg.fmode, 0); 3689 3690 if (calldata->res.fattr == NULL) 3691 calldata->arg.bitmask = NULL; 3692 else if (calldata->arg.bitmask == NULL) 3693 calldata->res.fattr = NULL; 3694 calldata->timestamp = jiffies; 3695 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3696 &calldata->arg.seq_args, 3697 &calldata->res.seq_res, 3698 task) != 0) 3699 nfs_release_seqid(calldata->arg.seqid); 3700 return; 3701 out_no_action: 3702 task->tk_action = NULL; 3703 out_wait: 3704 nfs4_sequence_done(task, &calldata->res.seq_res); 3705 } 3706 3707 static const struct rpc_call_ops nfs4_close_ops = { 3708 .rpc_call_prepare = nfs4_close_prepare, 3709 .rpc_call_done = nfs4_close_done, 3710 .rpc_release = nfs4_free_closedata, 3711 }; 3712 3713 /* 3714 * It is possible for data to be read/written from a mem-mapped file 3715 * after the sys_close call (which hits the vfs layer as a flush). 3716 * This means that we can't safely call nfsv4 close on a file until 3717 * the inode is cleared. This in turn means that we are not good 3718 * NFSv4 citizens - we do not indicate to the server to update the file's 3719 * share state even when we are done with one of the three share 3720 * stateid's in the inode. 3721 * 3722 * NOTE: Caller must be holding the sp->so_owner semaphore! 3723 */ 3724 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3725 { 3726 struct nfs_server *server = NFS_SERVER(state->inode); 3727 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3728 struct nfs4_closedata *calldata; 3729 struct nfs4_state_owner *sp = state->owner; 3730 struct rpc_task *task; 3731 struct rpc_message msg = { 3732 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3733 .rpc_cred = state->owner->so_cred, 3734 }; 3735 struct rpc_task_setup task_setup_data = { 3736 .rpc_client = server->client, 3737 .rpc_message = &msg, 3738 .callback_ops = &nfs4_close_ops, 3739 .workqueue = nfsiod_workqueue, 3740 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3741 }; 3742 int status = -ENOMEM; 3743 3744 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3745 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3746 3747 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3748 &task_setup_data.rpc_client, &msg); 3749 3750 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3751 if (calldata == NULL) 3752 goto out; 3753 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3754 calldata->inode = state->inode; 3755 calldata->state = state; 3756 calldata->arg.fh = NFS_FH(state->inode); 3757 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3758 goto out_free_calldata; 3759 /* Serialization for the sequence id */ 3760 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3761 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3762 if (IS_ERR(calldata->arg.seqid)) 3763 goto out_free_calldata; 3764 nfs_fattr_init(&calldata->fattr); 3765 calldata->arg.fmode = 0; 3766 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3767 calldata->res.fattr = &calldata->fattr; 3768 calldata->res.seqid = calldata->arg.seqid; 3769 calldata->res.server = server; 3770 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3771 calldata->lr.roc = pnfs_roc(state->inode, 3772 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3773 if (calldata->lr.roc) { 3774 calldata->arg.lr_args = &calldata->lr.arg; 3775 calldata->res.lr_res = &calldata->lr.res; 3776 } 3777 nfs_sb_active(calldata->inode->i_sb); 3778 3779 msg.rpc_argp = &calldata->arg; 3780 msg.rpc_resp = &calldata->res; 3781 task_setup_data.callback_data = calldata; 3782 task = rpc_run_task(&task_setup_data); 3783 if (IS_ERR(task)) 3784 return PTR_ERR(task); 3785 status = 0; 3786 if (wait) 3787 status = rpc_wait_for_completion_task(task); 3788 rpc_put_task(task); 3789 return status; 3790 out_free_calldata: 3791 kfree(calldata); 3792 out: 3793 nfs4_put_open_state(state); 3794 nfs4_put_state_owner(sp); 3795 return status; 3796 } 3797 3798 static struct inode * 3799 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3800 int open_flags, struct iattr *attr, int *opened) 3801 { 3802 struct nfs4_state *state; 3803 struct nfs4_label l, *label; 3804 3805 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3806 3807 /* Protect against concurrent sillydeletes */ 3808 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3809 3810 nfs4_label_release_security(label); 3811 3812 if (IS_ERR(state)) 3813 return ERR_CAST(state); 3814 return state->inode; 3815 } 3816 3817 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3818 { 3819 if (ctx->state == NULL) 3820 return; 3821 if (is_sync) 3822 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3823 else 3824 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3825 } 3826 3827 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3828 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3829 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3830 3831 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3832 { 3833 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3834 struct nfs4_server_caps_arg args = { 3835 .fhandle = fhandle, 3836 .bitmask = bitmask, 3837 }; 3838 struct nfs4_server_caps_res res = {}; 3839 struct rpc_message msg = { 3840 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3841 .rpc_argp = &args, 3842 .rpc_resp = &res, 3843 }; 3844 int status; 3845 int i; 3846 3847 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3848 FATTR4_WORD0_FH_EXPIRE_TYPE | 3849 FATTR4_WORD0_LINK_SUPPORT | 3850 FATTR4_WORD0_SYMLINK_SUPPORT | 3851 FATTR4_WORD0_ACLSUPPORT | 3852 FATTR4_WORD0_CASE_INSENSITIVE | 3853 FATTR4_WORD0_CASE_PRESERVING; 3854 if (minorversion) 3855 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3856 3857 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3858 if (status == 0) { 3859 /* Sanity check the server answers */ 3860 switch (minorversion) { 3861 case 0: 3862 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3863 res.attr_bitmask[2] = 0; 3864 break; 3865 case 1: 3866 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3867 break; 3868 case 2: 3869 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3870 } 3871 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3872 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3873 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3874 server->fattr_valid = NFS_ATTR_FATTR_V4; 3875 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3876 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3877 server->caps |= NFS_CAP_ACLS; 3878 if (res.has_links != 0) 3879 server->caps |= NFS_CAP_HARDLINKS; 3880 if (res.has_symlinks != 0) 3881 server->caps |= NFS_CAP_SYMLINKS; 3882 if (res.case_insensitive) 3883 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3884 if (res.case_preserving) 3885 server->caps |= NFS_CAP_CASE_PRESERVING; 3886 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3887 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3888 server->caps |= NFS_CAP_SECURITY_LABEL; 3889 #endif 3890 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3891 server->caps |= NFS_CAP_FS_LOCATIONS; 3892 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3893 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3894 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3895 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3896 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3897 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3898 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3899 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3900 NFS_ATTR_FATTR_OWNER_NAME); 3901 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3902 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3903 NFS_ATTR_FATTR_GROUP_NAME); 3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3905 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3906 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3907 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3908 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3909 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3910 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3911 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3912 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3913 sizeof(server->attr_bitmask)); 3914 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3915 3916 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3917 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3918 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3919 server->cache_consistency_bitmask[2] = 0; 3920 3921 /* Avoid a regression due to buggy server */ 3922 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3923 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3924 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3925 sizeof(server->exclcreat_bitmask)); 3926 3927 server->acl_bitmask = res.acl_bitmask; 3928 server->fh_expire_type = res.fh_expire_type; 3929 } 3930 3931 return status; 3932 } 3933 3934 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3935 { 3936 struct nfs4_exception exception = { 3937 .interruptible = true, 3938 }; 3939 int err; 3940 3941 nfs4_server_set_init_caps(server); 3942 do { 3943 err = nfs4_handle_exception(server, 3944 _nfs4_server_capabilities(server, fhandle), 3945 &exception); 3946 } while (exception.retry); 3947 return err; 3948 } 3949 3950 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3951 struct nfs_client *clp, 3952 struct nfs_server *server) 3953 { 3954 int i; 3955 3956 for (i = 0; i < location->nservers; i++) { 3957 struct nfs4_string *srv_loc = &location->servers[i]; 3958 struct sockaddr_storage addr; 3959 size_t addrlen; 3960 struct xprt_create xprt_args = { 3961 .ident = 0, 3962 .net = clp->cl_net, 3963 }; 3964 struct nfs4_add_xprt_data xprtdata = { 3965 .clp = clp, 3966 }; 3967 struct rpc_add_xprt_test rpcdata = { 3968 .add_xprt_test = clp->cl_mvops->session_trunk, 3969 .data = &xprtdata, 3970 }; 3971 char *servername = NULL; 3972 3973 if (!srv_loc->len) 3974 continue; 3975 3976 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3977 &addr, sizeof(addr), 3978 clp->cl_net, server->port); 3979 if (!addrlen) 3980 return; 3981 xprt_args.dstaddr = (struct sockaddr *)&addr; 3982 xprt_args.addrlen = addrlen; 3983 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3984 if (!servername) 3985 return; 3986 memcpy(servername, srv_loc->data, srv_loc->len); 3987 servername[srv_loc->len] = '\0'; 3988 xprt_args.servername = servername; 3989 3990 xprtdata.cred = nfs4_get_clid_cred(clp); 3991 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3992 rpc_clnt_setup_test_and_add_xprt, 3993 &rpcdata); 3994 if (xprtdata.cred) 3995 put_cred(xprtdata.cred); 3996 kfree(servername); 3997 } 3998 } 3999 4000 static int _nfs4_discover_trunking(struct nfs_server *server, 4001 struct nfs_fh *fhandle) 4002 { 4003 struct nfs4_fs_locations *locations = NULL; 4004 struct page *page; 4005 const struct cred *cred; 4006 struct nfs_client *clp = server->nfs_client; 4007 const struct nfs4_state_maintenance_ops *ops = 4008 clp->cl_mvops->state_renewal_ops; 4009 int status = -ENOMEM, i; 4010 4011 cred = ops->get_state_renewal_cred(clp); 4012 if (cred == NULL) { 4013 cred = nfs4_get_clid_cred(clp); 4014 if (cred == NULL) 4015 return -ENOKEY; 4016 } 4017 4018 page = alloc_page(GFP_KERNEL); 4019 if (!page) 4020 goto out_put_cred; 4021 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4022 if (!locations) 4023 goto out_free; 4024 locations->fattr = nfs_alloc_fattr(); 4025 if (!locations->fattr) 4026 goto out_free_2; 4027 4028 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4029 cred); 4030 if (status) 4031 goto out_free_3; 4032 4033 for (i = 0; i < locations->nlocations; i++) 4034 test_fs_location_for_trunking(&locations->locations[i], clp, 4035 server); 4036 out_free_3: 4037 kfree(locations->fattr); 4038 out_free_2: 4039 kfree(locations); 4040 out_free: 4041 __free_page(page); 4042 out_put_cred: 4043 put_cred(cred); 4044 return status; 4045 } 4046 4047 static int nfs4_discover_trunking(struct nfs_server *server, 4048 struct nfs_fh *fhandle) 4049 { 4050 struct nfs4_exception exception = { 4051 .interruptible = true, 4052 }; 4053 struct nfs_client *clp = server->nfs_client; 4054 int err = 0; 4055 4056 if (!nfs4_has_session(clp)) 4057 goto out; 4058 do { 4059 err = nfs4_handle_exception(server, 4060 _nfs4_discover_trunking(server, fhandle), 4061 &exception); 4062 } while (exception.retry); 4063 out: 4064 return err; 4065 } 4066 4067 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4068 struct nfs_fsinfo *info) 4069 { 4070 u32 bitmask[3]; 4071 struct nfs4_lookup_root_arg args = { 4072 .bitmask = bitmask, 4073 }; 4074 struct nfs4_lookup_res res = { 4075 .server = server, 4076 .fattr = info->fattr, 4077 .fh = fhandle, 4078 }; 4079 struct rpc_message msg = { 4080 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4081 .rpc_argp = &args, 4082 .rpc_resp = &res, 4083 }; 4084 4085 bitmask[0] = nfs4_fattr_bitmap[0]; 4086 bitmask[1] = nfs4_fattr_bitmap[1]; 4087 /* 4088 * Process the label in the upcoming getfattr 4089 */ 4090 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4091 4092 nfs_fattr_init(info->fattr); 4093 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4094 } 4095 4096 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4097 struct nfs_fsinfo *info) 4098 { 4099 struct nfs4_exception exception = { 4100 .interruptible = true, 4101 }; 4102 int err; 4103 do { 4104 err = _nfs4_lookup_root(server, fhandle, info); 4105 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4106 switch (err) { 4107 case 0: 4108 case -NFS4ERR_WRONGSEC: 4109 goto out; 4110 default: 4111 err = nfs4_handle_exception(server, err, &exception); 4112 } 4113 } while (exception.retry); 4114 out: 4115 return err; 4116 } 4117 4118 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4119 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4120 { 4121 struct rpc_auth_create_args auth_args = { 4122 .pseudoflavor = flavor, 4123 }; 4124 struct rpc_auth *auth; 4125 4126 auth = rpcauth_create(&auth_args, server->client); 4127 if (IS_ERR(auth)) 4128 return -EACCES; 4129 return nfs4_lookup_root(server, fhandle, info); 4130 } 4131 4132 /* 4133 * Retry pseudoroot lookup with various security flavors. We do this when: 4134 * 4135 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4136 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4137 * 4138 * Returns zero on success, or a negative NFS4ERR value, or a 4139 * negative errno value. 4140 */ 4141 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4142 struct nfs_fsinfo *info) 4143 { 4144 /* Per 3530bis 15.33.5 */ 4145 static const rpc_authflavor_t flav_array[] = { 4146 RPC_AUTH_GSS_KRB5P, 4147 RPC_AUTH_GSS_KRB5I, 4148 RPC_AUTH_GSS_KRB5, 4149 RPC_AUTH_UNIX, /* courtesy */ 4150 RPC_AUTH_NULL, 4151 }; 4152 int status = -EPERM; 4153 size_t i; 4154 4155 if (server->auth_info.flavor_len > 0) { 4156 /* try each flavor specified by user */ 4157 for (i = 0; i < server->auth_info.flavor_len; i++) { 4158 status = nfs4_lookup_root_sec(server, fhandle, info, 4159 server->auth_info.flavors[i]); 4160 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4161 continue; 4162 break; 4163 } 4164 } else { 4165 /* no flavors specified by user, try default list */ 4166 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4167 status = nfs4_lookup_root_sec(server, fhandle, info, 4168 flav_array[i]); 4169 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4170 continue; 4171 break; 4172 } 4173 } 4174 4175 /* 4176 * -EACCES could mean that the user doesn't have correct permissions 4177 * to access the mount. It could also mean that we tried to mount 4178 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4179 * existing mount programs don't handle -EACCES very well so it should 4180 * be mapped to -EPERM instead. 4181 */ 4182 if (status == -EACCES) 4183 status = -EPERM; 4184 return status; 4185 } 4186 4187 /** 4188 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4189 * @server: initialized nfs_server handle 4190 * @fhandle: we fill in the pseudo-fs root file handle 4191 * @info: we fill in an FSINFO struct 4192 * @auth_probe: probe the auth flavours 4193 * 4194 * Returns zero on success, or a negative errno. 4195 */ 4196 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4197 struct nfs_fsinfo *info, 4198 bool auth_probe) 4199 { 4200 int status = 0; 4201 4202 if (!auth_probe) 4203 status = nfs4_lookup_root(server, fhandle, info); 4204 4205 if (auth_probe || status == NFS4ERR_WRONGSEC) 4206 status = server->nfs_client->cl_mvops->find_root_sec(server, 4207 fhandle, info); 4208 4209 if (status == 0) 4210 status = nfs4_server_capabilities(server, fhandle); 4211 if (status == 0) 4212 status = nfs4_do_fsinfo(server, fhandle, info); 4213 4214 return nfs4_map_errors(status); 4215 } 4216 4217 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4218 struct nfs_fsinfo *info) 4219 { 4220 int error; 4221 struct nfs_fattr *fattr = info->fattr; 4222 4223 error = nfs4_server_capabilities(server, mntfh); 4224 if (error < 0) { 4225 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4226 return error; 4227 } 4228 4229 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4230 if (error < 0) { 4231 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4232 goto out; 4233 } 4234 4235 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4236 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4237 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4238 4239 out: 4240 return error; 4241 } 4242 4243 /* 4244 * Get locations and (maybe) other attributes of a referral. 4245 * Note that we'll actually follow the referral later when 4246 * we detect fsid mismatch in inode revalidation 4247 */ 4248 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4249 const struct qstr *name, struct nfs_fattr *fattr, 4250 struct nfs_fh *fhandle) 4251 { 4252 int status = -ENOMEM; 4253 struct page *page = NULL; 4254 struct nfs4_fs_locations *locations = NULL; 4255 4256 page = alloc_page(GFP_KERNEL); 4257 if (page == NULL) 4258 goto out; 4259 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4260 if (locations == NULL) 4261 goto out; 4262 4263 locations->fattr = fattr; 4264 4265 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4266 if (status != 0) 4267 goto out; 4268 4269 /* 4270 * If the fsid didn't change, this is a migration event, not a 4271 * referral. Cause us to drop into the exception handler, which 4272 * will kick off migration recovery. 4273 */ 4274 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4275 dprintk("%s: server did not return a different fsid for" 4276 " a referral at %s\n", __func__, name->name); 4277 status = -NFS4ERR_MOVED; 4278 goto out; 4279 } 4280 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4281 nfs_fixup_referral_attributes(fattr); 4282 memset(fhandle, 0, sizeof(struct nfs_fh)); 4283 out: 4284 if (page) 4285 __free_page(page); 4286 kfree(locations); 4287 return status; 4288 } 4289 4290 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4291 struct nfs_fattr *fattr, struct inode *inode) 4292 { 4293 __u32 bitmask[NFS4_BITMASK_SZ]; 4294 struct nfs4_getattr_arg args = { 4295 .fh = fhandle, 4296 .bitmask = bitmask, 4297 }; 4298 struct nfs4_getattr_res res = { 4299 .fattr = fattr, 4300 .server = server, 4301 }; 4302 struct rpc_message msg = { 4303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4304 .rpc_argp = &args, 4305 .rpc_resp = &res, 4306 }; 4307 unsigned short task_flags = 0; 4308 4309 if (nfs4_has_session(server->nfs_client)) 4310 task_flags = RPC_TASK_MOVEABLE; 4311 4312 /* Is this is an attribute revalidation, subject to softreval? */ 4313 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4314 task_flags |= RPC_TASK_TIMEOUT; 4315 4316 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4317 nfs_fattr_init(fattr); 4318 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4319 return nfs4_do_call_sync(server->client, server, &msg, 4320 &args.seq_args, &res.seq_res, task_flags); 4321 } 4322 4323 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4324 struct nfs_fattr *fattr, struct inode *inode) 4325 { 4326 struct nfs4_exception exception = { 4327 .interruptible = true, 4328 }; 4329 int err; 4330 do { 4331 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4332 trace_nfs4_getattr(server, fhandle, fattr, err); 4333 err = nfs4_handle_exception(server, err, 4334 &exception); 4335 } while (exception.retry); 4336 return err; 4337 } 4338 4339 /* 4340 * The file is not closed if it is opened due to the a request to change 4341 * the size of the file. The open call will not be needed once the 4342 * VFS layer lookup-intents are implemented. 4343 * 4344 * Close is called when the inode is destroyed. 4345 * If we haven't opened the file for O_WRONLY, we 4346 * need to in the size_change case to obtain a stateid. 4347 * 4348 * Got race? 4349 * Because OPEN is always done by name in nfsv4, it is 4350 * possible that we opened a different file by the same 4351 * name. We can recognize this race condition, but we 4352 * can't do anything about it besides returning an error. 4353 * 4354 * This will be fixed with VFS changes (lookup-intent). 4355 */ 4356 static int 4357 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4358 struct iattr *sattr) 4359 { 4360 struct inode *inode = d_inode(dentry); 4361 const struct cred *cred = NULL; 4362 struct nfs_open_context *ctx = NULL; 4363 int status; 4364 4365 if (pnfs_ld_layoutret_on_setattr(inode) && 4366 sattr->ia_valid & ATTR_SIZE && 4367 sattr->ia_size < i_size_read(inode)) 4368 pnfs_commit_and_return_layout(inode); 4369 4370 nfs_fattr_init(fattr); 4371 4372 /* Deal with open(O_TRUNC) */ 4373 if (sattr->ia_valid & ATTR_OPEN) 4374 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4375 4376 /* Optimization: if the end result is no change, don't RPC */ 4377 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4378 return 0; 4379 4380 /* Search for an existing open(O_WRITE) file */ 4381 if (sattr->ia_valid & ATTR_FILE) { 4382 4383 ctx = nfs_file_open_context(sattr->ia_file); 4384 if (ctx) 4385 cred = ctx->cred; 4386 } 4387 4388 /* Return any delegations if we're going to change ACLs */ 4389 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4390 nfs4_inode_make_writeable(inode); 4391 4392 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4393 if (status == 0) { 4394 nfs_setattr_update_inode(inode, sattr, fattr); 4395 nfs_setsecurity(inode, fattr); 4396 } 4397 return status; 4398 } 4399 4400 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4401 struct dentry *dentry, struct nfs_fh *fhandle, 4402 struct nfs_fattr *fattr) 4403 { 4404 struct nfs_server *server = NFS_SERVER(dir); 4405 int status; 4406 struct nfs4_lookup_arg args = { 4407 .bitmask = server->attr_bitmask, 4408 .dir_fh = NFS_FH(dir), 4409 .name = &dentry->d_name, 4410 }; 4411 struct nfs4_lookup_res res = { 4412 .server = server, 4413 .fattr = fattr, 4414 .fh = fhandle, 4415 }; 4416 struct rpc_message msg = { 4417 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4418 .rpc_argp = &args, 4419 .rpc_resp = &res, 4420 }; 4421 unsigned short task_flags = 0; 4422 4423 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4424 task_flags = RPC_TASK_MOVEABLE; 4425 4426 /* Is this is an attribute revalidation, subject to softreval? */ 4427 if (nfs_lookup_is_soft_revalidate(dentry)) 4428 task_flags |= RPC_TASK_TIMEOUT; 4429 4430 args.bitmask = nfs4_bitmask(server, fattr->label); 4431 4432 nfs_fattr_init(fattr); 4433 4434 dprintk("NFS call lookup %pd2\n", dentry); 4435 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4436 status = nfs4_do_call_sync(clnt, server, &msg, 4437 &args.seq_args, &res.seq_res, task_flags); 4438 dprintk("NFS reply lookup: %d\n", status); 4439 return status; 4440 } 4441 4442 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4443 { 4444 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4445 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4446 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4447 fattr->nlink = 2; 4448 } 4449 4450 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4451 struct dentry *dentry, struct nfs_fh *fhandle, 4452 struct nfs_fattr *fattr) 4453 { 4454 struct nfs4_exception exception = { 4455 .interruptible = true, 4456 }; 4457 struct rpc_clnt *client = *clnt; 4458 const struct qstr *name = &dentry->d_name; 4459 int err; 4460 do { 4461 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4462 trace_nfs4_lookup(dir, name, err); 4463 switch (err) { 4464 case -NFS4ERR_BADNAME: 4465 err = -ENOENT; 4466 goto out; 4467 case -NFS4ERR_MOVED: 4468 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4469 if (err == -NFS4ERR_MOVED) 4470 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4471 goto out; 4472 case -NFS4ERR_WRONGSEC: 4473 err = -EPERM; 4474 if (client != *clnt) 4475 goto out; 4476 client = nfs4_negotiate_security(client, dir, name); 4477 if (IS_ERR(client)) 4478 return PTR_ERR(client); 4479 4480 exception.retry = 1; 4481 break; 4482 default: 4483 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4484 } 4485 } while (exception.retry); 4486 4487 out: 4488 if (err == 0) 4489 *clnt = client; 4490 else if (client != *clnt) 4491 rpc_shutdown_client(client); 4492 4493 return err; 4494 } 4495 4496 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4497 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4498 { 4499 int status; 4500 struct rpc_clnt *client = NFS_CLIENT(dir); 4501 4502 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4503 if (client != NFS_CLIENT(dir)) { 4504 rpc_shutdown_client(client); 4505 nfs_fixup_secinfo_attributes(fattr); 4506 } 4507 return status; 4508 } 4509 4510 struct rpc_clnt * 4511 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4512 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4513 { 4514 struct rpc_clnt *client = NFS_CLIENT(dir); 4515 int status; 4516 4517 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4518 if (status < 0) 4519 return ERR_PTR(status); 4520 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4521 } 4522 4523 static int _nfs4_proc_lookupp(struct inode *inode, 4524 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4525 { 4526 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4527 struct nfs_server *server = NFS_SERVER(inode); 4528 int status; 4529 struct nfs4_lookupp_arg args = { 4530 .bitmask = server->attr_bitmask, 4531 .fh = NFS_FH(inode), 4532 }; 4533 struct nfs4_lookupp_res res = { 4534 .server = server, 4535 .fattr = fattr, 4536 .fh = fhandle, 4537 }; 4538 struct rpc_message msg = { 4539 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4540 .rpc_argp = &args, 4541 .rpc_resp = &res, 4542 }; 4543 unsigned short task_flags = 0; 4544 4545 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4546 task_flags |= RPC_TASK_TIMEOUT; 4547 4548 args.bitmask = nfs4_bitmask(server, fattr->label); 4549 4550 nfs_fattr_init(fattr); 4551 4552 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4553 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4554 &res.seq_res, task_flags); 4555 dprintk("NFS reply lookupp: %d\n", status); 4556 return status; 4557 } 4558 4559 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4560 struct nfs_fattr *fattr) 4561 { 4562 struct nfs4_exception exception = { 4563 .interruptible = true, 4564 }; 4565 int err; 4566 do { 4567 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4568 trace_nfs4_lookupp(inode, err); 4569 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4570 &exception); 4571 } while (exception.retry); 4572 return err; 4573 } 4574 4575 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4576 const struct cred *cred) 4577 { 4578 struct nfs_server *server = NFS_SERVER(inode); 4579 struct nfs4_accessargs args = { 4580 .fh = NFS_FH(inode), 4581 .access = entry->mask, 4582 }; 4583 struct nfs4_accessres res = { 4584 .server = server, 4585 }; 4586 struct rpc_message msg = { 4587 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4588 .rpc_argp = &args, 4589 .rpc_resp = &res, 4590 .rpc_cred = cred, 4591 }; 4592 int status = 0; 4593 4594 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4595 res.fattr = nfs_alloc_fattr(); 4596 if (res.fattr == NULL) 4597 return -ENOMEM; 4598 args.bitmask = server->cache_consistency_bitmask; 4599 } 4600 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4601 if (!status) { 4602 nfs_access_set_mask(entry, res.access); 4603 if (res.fattr) 4604 nfs_refresh_inode(inode, res.fattr); 4605 } 4606 nfs_free_fattr(res.fattr); 4607 return status; 4608 } 4609 4610 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4611 const struct cred *cred) 4612 { 4613 struct nfs4_exception exception = { 4614 .interruptible = true, 4615 }; 4616 int err; 4617 do { 4618 err = _nfs4_proc_access(inode, entry, cred); 4619 trace_nfs4_access(inode, err); 4620 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4621 &exception); 4622 } while (exception.retry); 4623 return err; 4624 } 4625 4626 /* 4627 * TODO: For the time being, we don't try to get any attributes 4628 * along with any of the zero-copy operations READ, READDIR, 4629 * READLINK, WRITE. 4630 * 4631 * In the case of the first three, we want to put the GETATTR 4632 * after the read-type operation -- this is because it is hard 4633 * to predict the length of a GETATTR response in v4, and thus 4634 * align the READ data correctly. This means that the GETATTR 4635 * may end up partially falling into the page cache, and we should 4636 * shift it into the 'tail' of the xdr_buf before processing. 4637 * To do this efficiently, we need to know the total length 4638 * of data received, which doesn't seem to be available outside 4639 * of the RPC layer. 4640 * 4641 * In the case of WRITE, we also want to put the GETATTR after 4642 * the operation -- in this case because we want to make sure 4643 * we get the post-operation mtime and size. 4644 * 4645 * Both of these changes to the XDR layer would in fact be quite 4646 * minor, but I decided to leave them for a subsequent patch. 4647 */ 4648 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4649 unsigned int pgbase, unsigned int pglen) 4650 { 4651 struct nfs4_readlink args = { 4652 .fh = NFS_FH(inode), 4653 .pgbase = pgbase, 4654 .pglen = pglen, 4655 .pages = &page, 4656 }; 4657 struct nfs4_readlink_res res; 4658 struct rpc_message msg = { 4659 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4660 .rpc_argp = &args, 4661 .rpc_resp = &res, 4662 }; 4663 4664 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4665 } 4666 4667 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4668 unsigned int pgbase, unsigned int pglen) 4669 { 4670 struct nfs4_exception exception = { 4671 .interruptible = true, 4672 }; 4673 int err; 4674 do { 4675 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4676 trace_nfs4_readlink(inode, err); 4677 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4678 &exception); 4679 } while (exception.retry); 4680 return err; 4681 } 4682 4683 /* 4684 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4685 */ 4686 static int 4687 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4688 int flags) 4689 { 4690 struct nfs_server *server = NFS_SERVER(dir); 4691 struct nfs4_label l, *ilabel; 4692 struct nfs_open_context *ctx; 4693 struct nfs4_state *state; 4694 int status = 0; 4695 4696 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4697 if (IS_ERR(ctx)) 4698 return PTR_ERR(ctx); 4699 4700 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4701 4702 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4703 sattr->ia_mode &= ~current_umask(); 4704 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4705 if (IS_ERR(state)) { 4706 status = PTR_ERR(state); 4707 goto out; 4708 } 4709 out: 4710 nfs4_label_release_security(ilabel); 4711 put_nfs_open_context(ctx); 4712 return status; 4713 } 4714 4715 static int 4716 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4717 { 4718 struct nfs_server *server = NFS_SERVER(dir); 4719 struct nfs_removeargs args = { 4720 .fh = NFS_FH(dir), 4721 .name = *name, 4722 }; 4723 struct nfs_removeres res = { 4724 .server = server, 4725 }; 4726 struct rpc_message msg = { 4727 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4728 .rpc_argp = &args, 4729 .rpc_resp = &res, 4730 }; 4731 unsigned long timestamp = jiffies; 4732 int status; 4733 4734 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4735 if (status == 0) { 4736 spin_lock(&dir->i_lock); 4737 /* Removing a directory decrements nlink in the parent */ 4738 if (ftype == NF4DIR && dir->i_nlink > 2) 4739 nfs4_dec_nlink_locked(dir); 4740 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4741 NFS_INO_INVALID_DATA); 4742 spin_unlock(&dir->i_lock); 4743 } 4744 return status; 4745 } 4746 4747 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4748 { 4749 struct nfs4_exception exception = { 4750 .interruptible = true, 4751 }; 4752 struct inode *inode = d_inode(dentry); 4753 int err; 4754 4755 if (inode) { 4756 if (inode->i_nlink == 1) 4757 nfs4_inode_return_delegation(inode); 4758 else 4759 nfs4_inode_make_writeable(inode); 4760 } 4761 do { 4762 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4763 trace_nfs4_remove(dir, &dentry->d_name, err); 4764 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4765 &exception); 4766 } while (exception.retry); 4767 return err; 4768 } 4769 4770 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4771 { 4772 struct nfs4_exception exception = { 4773 .interruptible = true, 4774 }; 4775 int err; 4776 4777 do { 4778 err = _nfs4_proc_remove(dir, name, NF4DIR); 4779 trace_nfs4_remove(dir, name, err); 4780 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4781 &exception); 4782 } while (exception.retry); 4783 return err; 4784 } 4785 4786 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4787 struct dentry *dentry, 4788 struct inode *inode) 4789 { 4790 struct nfs_removeargs *args = msg->rpc_argp; 4791 struct nfs_removeres *res = msg->rpc_resp; 4792 4793 res->server = NFS_SB(dentry->d_sb); 4794 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4795 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4796 4797 nfs_fattr_init(res->dir_attr); 4798 4799 if (inode) { 4800 nfs4_inode_return_delegation(inode); 4801 nfs_d_prune_case_insensitive_aliases(inode); 4802 } 4803 } 4804 4805 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4806 { 4807 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4808 &data->args.seq_args, 4809 &data->res.seq_res, 4810 task); 4811 } 4812 4813 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4814 { 4815 struct nfs_unlinkdata *data = task->tk_calldata; 4816 struct nfs_removeres *res = &data->res; 4817 4818 if (!nfs4_sequence_done(task, &res->seq_res)) 4819 return 0; 4820 if (nfs4_async_handle_error(task, res->server, NULL, 4821 &data->timeout) == -EAGAIN) 4822 return 0; 4823 if (task->tk_status == 0) 4824 nfs4_update_changeattr(dir, &res->cinfo, 4825 res->dir_attr->time_start, 4826 NFS_INO_INVALID_DATA); 4827 return 1; 4828 } 4829 4830 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4831 struct dentry *old_dentry, 4832 struct dentry *new_dentry) 4833 { 4834 struct nfs_renameargs *arg = msg->rpc_argp; 4835 struct nfs_renameres *res = msg->rpc_resp; 4836 struct inode *old_inode = d_inode(old_dentry); 4837 struct inode *new_inode = d_inode(new_dentry); 4838 4839 if (old_inode) 4840 nfs4_inode_make_writeable(old_inode); 4841 if (new_inode) 4842 nfs4_inode_return_delegation(new_inode); 4843 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4844 res->server = NFS_SB(old_dentry->d_sb); 4845 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4846 } 4847 4848 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4849 { 4850 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4851 &data->args.seq_args, 4852 &data->res.seq_res, 4853 task); 4854 } 4855 4856 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4857 struct inode *new_dir) 4858 { 4859 struct nfs_renamedata *data = task->tk_calldata; 4860 struct nfs_renameres *res = &data->res; 4861 4862 if (!nfs4_sequence_done(task, &res->seq_res)) 4863 return 0; 4864 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4865 return 0; 4866 4867 if (task->tk_status == 0) { 4868 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4869 if (new_dir != old_dir) { 4870 /* Note: If we moved a directory, nlink will change */ 4871 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4872 res->old_fattr->time_start, 4873 NFS_INO_INVALID_NLINK | 4874 NFS_INO_INVALID_DATA); 4875 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4876 res->new_fattr->time_start, 4877 NFS_INO_INVALID_NLINK | 4878 NFS_INO_INVALID_DATA); 4879 } else 4880 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4881 res->old_fattr->time_start, 4882 NFS_INO_INVALID_DATA); 4883 } 4884 return 1; 4885 } 4886 4887 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4888 { 4889 struct nfs_server *server = NFS_SERVER(inode); 4890 __u32 bitmask[NFS4_BITMASK_SZ]; 4891 struct nfs4_link_arg arg = { 4892 .fh = NFS_FH(inode), 4893 .dir_fh = NFS_FH(dir), 4894 .name = name, 4895 .bitmask = bitmask, 4896 }; 4897 struct nfs4_link_res res = { 4898 .server = server, 4899 }; 4900 struct rpc_message msg = { 4901 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4902 .rpc_argp = &arg, 4903 .rpc_resp = &res, 4904 }; 4905 int status = -ENOMEM; 4906 4907 res.fattr = nfs_alloc_fattr_with_label(server); 4908 if (res.fattr == NULL) 4909 goto out; 4910 4911 nfs4_inode_make_writeable(inode); 4912 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4913 NFS_INO_INVALID_CHANGE); 4914 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4915 if (!status) { 4916 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4917 NFS_INO_INVALID_DATA); 4918 nfs4_inc_nlink(inode); 4919 status = nfs_post_op_update_inode(inode, res.fattr); 4920 if (!status) 4921 nfs_setsecurity(inode, res.fattr); 4922 } 4923 4924 out: 4925 nfs_free_fattr(res.fattr); 4926 return status; 4927 } 4928 4929 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4930 { 4931 struct nfs4_exception exception = { 4932 .interruptible = true, 4933 }; 4934 int err; 4935 do { 4936 err = nfs4_handle_exception(NFS_SERVER(inode), 4937 _nfs4_proc_link(inode, dir, name), 4938 &exception); 4939 } while (exception.retry); 4940 return err; 4941 } 4942 4943 struct nfs4_createdata { 4944 struct rpc_message msg; 4945 struct nfs4_create_arg arg; 4946 struct nfs4_create_res res; 4947 struct nfs_fh fh; 4948 struct nfs_fattr fattr; 4949 }; 4950 4951 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4952 const struct qstr *name, struct iattr *sattr, u32 ftype) 4953 { 4954 struct nfs4_createdata *data; 4955 4956 data = kzalloc(sizeof(*data), GFP_KERNEL); 4957 if (data != NULL) { 4958 struct nfs_server *server = NFS_SERVER(dir); 4959 4960 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4961 if (IS_ERR(data->fattr.label)) 4962 goto out_free; 4963 4964 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4965 data->msg.rpc_argp = &data->arg; 4966 data->msg.rpc_resp = &data->res; 4967 data->arg.dir_fh = NFS_FH(dir); 4968 data->arg.server = server; 4969 data->arg.name = name; 4970 data->arg.attrs = sattr; 4971 data->arg.ftype = ftype; 4972 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4973 data->arg.umask = current_umask(); 4974 data->res.server = server; 4975 data->res.fh = &data->fh; 4976 data->res.fattr = &data->fattr; 4977 nfs_fattr_init(data->res.fattr); 4978 } 4979 return data; 4980 out_free: 4981 kfree(data); 4982 return NULL; 4983 } 4984 4985 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4986 { 4987 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4988 &data->arg.seq_args, &data->res.seq_res, 1); 4989 if (status == 0) { 4990 spin_lock(&dir->i_lock); 4991 /* Creating a directory bumps nlink in the parent */ 4992 if (data->arg.ftype == NF4DIR) 4993 nfs4_inc_nlink_locked(dir); 4994 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4995 data->res.fattr->time_start, 4996 NFS_INO_INVALID_DATA); 4997 spin_unlock(&dir->i_lock); 4998 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 4999 } 5000 return status; 5001 } 5002 5003 static void nfs4_free_createdata(struct nfs4_createdata *data) 5004 { 5005 nfs4_label_free(data->fattr.label); 5006 kfree(data); 5007 } 5008 5009 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5010 struct page *page, unsigned int len, struct iattr *sattr, 5011 struct nfs4_label *label) 5012 { 5013 struct nfs4_createdata *data; 5014 int status = -ENAMETOOLONG; 5015 5016 if (len > NFS4_MAXPATHLEN) 5017 goto out; 5018 5019 status = -ENOMEM; 5020 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5021 if (data == NULL) 5022 goto out; 5023 5024 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5025 data->arg.u.symlink.pages = &page; 5026 data->arg.u.symlink.len = len; 5027 data->arg.label = label; 5028 5029 status = nfs4_do_create(dir, dentry, data); 5030 5031 nfs4_free_createdata(data); 5032 out: 5033 return status; 5034 } 5035 5036 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5037 struct page *page, unsigned int len, struct iattr *sattr) 5038 { 5039 struct nfs4_exception exception = { 5040 .interruptible = true, 5041 }; 5042 struct nfs4_label l, *label; 5043 int err; 5044 5045 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5046 5047 do { 5048 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5049 trace_nfs4_symlink(dir, &dentry->d_name, err); 5050 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5051 &exception); 5052 } while (exception.retry); 5053 5054 nfs4_label_release_security(label); 5055 return err; 5056 } 5057 5058 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5059 struct iattr *sattr, struct nfs4_label *label) 5060 { 5061 struct nfs4_createdata *data; 5062 int status = -ENOMEM; 5063 5064 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5065 if (data == NULL) 5066 goto out; 5067 5068 data->arg.label = label; 5069 status = nfs4_do_create(dir, dentry, data); 5070 5071 nfs4_free_createdata(data); 5072 out: 5073 return status; 5074 } 5075 5076 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5077 struct iattr *sattr) 5078 { 5079 struct nfs_server *server = NFS_SERVER(dir); 5080 struct nfs4_exception exception = { 5081 .interruptible = true, 5082 }; 5083 struct nfs4_label l, *label; 5084 int err; 5085 5086 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5087 5088 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5089 sattr->ia_mode &= ~current_umask(); 5090 do { 5091 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5092 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5093 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5094 &exception); 5095 } while (exception.retry); 5096 nfs4_label_release_security(label); 5097 5098 return err; 5099 } 5100 5101 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5102 struct nfs_readdir_res *nr_res) 5103 { 5104 struct inode *dir = d_inode(nr_arg->dentry); 5105 struct nfs_server *server = NFS_SERVER(dir); 5106 struct nfs4_readdir_arg args = { 5107 .fh = NFS_FH(dir), 5108 .pages = nr_arg->pages, 5109 .pgbase = 0, 5110 .count = nr_arg->page_len, 5111 .plus = nr_arg->plus, 5112 }; 5113 struct nfs4_readdir_res res; 5114 struct rpc_message msg = { 5115 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5116 .rpc_argp = &args, 5117 .rpc_resp = &res, 5118 .rpc_cred = nr_arg->cred, 5119 }; 5120 int status; 5121 5122 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5123 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5124 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5125 args.bitmask = server->attr_bitmask_nl; 5126 else 5127 args.bitmask = server->attr_bitmask; 5128 5129 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5130 res.pgbase = args.pgbase; 5131 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5132 &res.seq_res, 0); 5133 if (status >= 0) { 5134 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5135 status += args.pgbase; 5136 } 5137 5138 nfs_invalidate_atime(dir); 5139 5140 dprintk("%s: returns %d\n", __func__, status); 5141 return status; 5142 } 5143 5144 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5145 struct nfs_readdir_res *res) 5146 { 5147 struct nfs4_exception exception = { 5148 .interruptible = true, 5149 }; 5150 int err; 5151 do { 5152 err = _nfs4_proc_readdir(arg, res); 5153 trace_nfs4_readdir(d_inode(arg->dentry), err); 5154 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5155 err, &exception); 5156 } while (exception.retry); 5157 return err; 5158 } 5159 5160 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5161 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5162 { 5163 struct nfs4_createdata *data; 5164 int mode = sattr->ia_mode; 5165 int status = -ENOMEM; 5166 5167 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5168 if (data == NULL) 5169 goto out; 5170 5171 if (S_ISFIFO(mode)) 5172 data->arg.ftype = NF4FIFO; 5173 else if (S_ISBLK(mode)) { 5174 data->arg.ftype = NF4BLK; 5175 data->arg.u.device.specdata1 = MAJOR(rdev); 5176 data->arg.u.device.specdata2 = MINOR(rdev); 5177 } 5178 else if (S_ISCHR(mode)) { 5179 data->arg.ftype = NF4CHR; 5180 data->arg.u.device.specdata1 = MAJOR(rdev); 5181 data->arg.u.device.specdata2 = MINOR(rdev); 5182 } else if (!S_ISSOCK(mode)) { 5183 status = -EINVAL; 5184 goto out_free; 5185 } 5186 5187 data->arg.label = label; 5188 status = nfs4_do_create(dir, dentry, data); 5189 out_free: 5190 nfs4_free_createdata(data); 5191 out: 5192 return status; 5193 } 5194 5195 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5196 struct iattr *sattr, dev_t rdev) 5197 { 5198 struct nfs_server *server = NFS_SERVER(dir); 5199 struct nfs4_exception exception = { 5200 .interruptible = true, 5201 }; 5202 struct nfs4_label l, *label; 5203 int err; 5204 5205 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5206 5207 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5208 sattr->ia_mode &= ~current_umask(); 5209 do { 5210 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5211 trace_nfs4_mknod(dir, &dentry->d_name, err); 5212 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5213 &exception); 5214 } while (exception.retry); 5215 5216 nfs4_label_release_security(label); 5217 5218 return err; 5219 } 5220 5221 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5222 struct nfs_fsstat *fsstat) 5223 { 5224 struct nfs4_statfs_arg args = { 5225 .fh = fhandle, 5226 .bitmask = server->attr_bitmask, 5227 }; 5228 struct nfs4_statfs_res res = { 5229 .fsstat = fsstat, 5230 }; 5231 struct rpc_message msg = { 5232 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5233 .rpc_argp = &args, 5234 .rpc_resp = &res, 5235 }; 5236 5237 nfs_fattr_init(fsstat->fattr); 5238 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5239 } 5240 5241 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5242 { 5243 struct nfs4_exception exception = { 5244 .interruptible = true, 5245 }; 5246 int err; 5247 do { 5248 err = nfs4_handle_exception(server, 5249 _nfs4_proc_statfs(server, fhandle, fsstat), 5250 &exception); 5251 } while (exception.retry); 5252 return err; 5253 } 5254 5255 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5256 struct nfs_fsinfo *fsinfo) 5257 { 5258 struct nfs4_fsinfo_arg args = { 5259 .fh = fhandle, 5260 .bitmask = server->attr_bitmask, 5261 }; 5262 struct nfs4_fsinfo_res res = { 5263 .fsinfo = fsinfo, 5264 }; 5265 struct rpc_message msg = { 5266 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5267 .rpc_argp = &args, 5268 .rpc_resp = &res, 5269 }; 5270 5271 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5272 } 5273 5274 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5275 { 5276 struct nfs4_exception exception = { 5277 .interruptible = true, 5278 }; 5279 int err; 5280 5281 do { 5282 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5283 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5284 if (err == 0) { 5285 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5286 break; 5287 } 5288 err = nfs4_handle_exception(server, err, &exception); 5289 } while (exception.retry); 5290 return err; 5291 } 5292 5293 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5294 { 5295 int error; 5296 5297 nfs_fattr_init(fsinfo->fattr); 5298 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5299 if (error == 0) { 5300 /* block layout checks this! */ 5301 server->pnfs_blksize = fsinfo->blksize; 5302 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5303 } 5304 5305 return error; 5306 } 5307 5308 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5309 struct nfs_pathconf *pathconf) 5310 { 5311 struct nfs4_pathconf_arg args = { 5312 .fh = fhandle, 5313 .bitmask = server->attr_bitmask, 5314 }; 5315 struct nfs4_pathconf_res res = { 5316 .pathconf = pathconf, 5317 }; 5318 struct rpc_message msg = { 5319 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5320 .rpc_argp = &args, 5321 .rpc_resp = &res, 5322 }; 5323 5324 /* None of the pathconf attributes are mandatory to implement */ 5325 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5326 memset(pathconf, 0, sizeof(*pathconf)); 5327 return 0; 5328 } 5329 5330 nfs_fattr_init(pathconf->fattr); 5331 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5332 } 5333 5334 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5335 struct nfs_pathconf *pathconf) 5336 { 5337 struct nfs4_exception exception = { 5338 .interruptible = true, 5339 }; 5340 int err; 5341 5342 do { 5343 err = nfs4_handle_exception(server, 5344 _nfs4_proc_pathconf(server, fhandle, pathconf), 5345 &exception); 5346 } while (exception.retry); 5347 return err; 5348 } 5349 5350 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5351 const struct nfs_open_context *ctx, 5352 const struct nfs_lock_context *l_ctx, 5353 fmode_t fmode) 5354 { 5355 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5356 } 5357 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5358 5359 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5360 const struct nfs_open_context *ctx, 5361 const struct nfs_lock_context *l_ctx, 5362 fmode_t fmode) 5363 { 5364 nfs4_stateid _current_stateid; 5365 5366 /* If the current stateid represents a lost lock, then exit */ 5367 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5368 return true; 5369 return nfs4_stateid_match(stateid, &_current_stateid); 5370 } 5371 5372 static bool nfs4_error_stateid_expired(int err) 5373 { 5374 switch (err) { 5375 case -NFS4ERR_DELEG_REVOKED: 5376 case -NFS4ERR_ADMIN_REVOKED: 5377 case -NFS4ERR_BAD_STATEID: 5378 case -NFS4ERR_STALE_STATEID: 5379 case -NFS4ERR_OLD_STATEID: 5380 case -NFS4ERR_OPENMODE: 5381 case -NFS4ERR_EXPIRED: 5382 return true; 5383 } 5384 return false; 5385 } 5386 5387 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5388 { 5389 struct nfs_server *server = NFS_SERVER(hdr->inode); 5390 5391 trace_nfs4_read(hdr, task->tk_status); 5392 if (task->tk_status < 0) { 5393 struct nfs4_exception exception = { 5394 .inode = hdr->inode, 5395 .state = hdr->args.context->state, 5396 .stateid = &hdr->args.stateid, 5397 }; 5398 task->tk_status = nfs4_async_handle_exception(task, 5399 server, task->tk_status, &exception); 5400 if (exception.retry) { 5401 rpc_restart_call_prepare(task); 5402 return -EAGAIN; 5403 } 5404 } 5405 5406 if (task->tk_status > 0) 5407 renew_lease(server, hdr->timestamp); 5408 return 0; 5409 } 5410 5411 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5412 struct nfs_pgio_args *args) 5413 { 5414 5415 if (!nfs4_error_stateid_expired(task->tk_status) || 5416 nfs4_stateid_is_current(&args->stateid, 5417 args->context, 5418 args->lock_context, 5419 FMODE_READ)) 5420 return false; 5421 rpc_restart_call_prepare(task); 5422 return true; 5423 } 5424 5425 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5426 struct nfs_pgio_header *hdr) 5427 { 5428 struct nfs_server *server = NFS_SERVER(hdr->inode); 5429 struct rpc_message *msg = &task->tk_msg; 5430 5431 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5432 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5433 server->caps &= ~NFS_CAP_READ_PLUS; 5434 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5435 rpc_restart_call_prepare(task); 5436 return true; 5437 } 5438 return false; 5439 } 5440 5441 static inline void nfs4_read_plus_scratch_free(struct nfs_pgio_header *hdr) 5442 { 5443 if (hdr->res.scratch) { 5444 kfree(hdr->res.scratch); 5445 hdr->res.scratch = NULL; 5446 } 5447 } 5448 5449 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5450 { 5451 nfs4_read_plus_scratch_free(hdr); 5452 5453 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5454 return -EAGAIN; 5455 if (nfs4_read_stateid_changed(task, &hdr->args)) 5456 return -EAGAIN; 5457 if (nfs4_read_plus_not_supported(task, hdr)) 5458 return -EAGAIN; 5459 if (task->tk_status > 0) 5460 nfs_invalidate_atime(hdr->inode); 5461 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5462 nfs4_read_done_cb(task, hdr); 5463 } 5464 5465 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5466 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5467 struct rpc_message *msg) 5468 { 5469 /* Note: We don't use READ_PLUS with pNFS yet */ 5470 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5471 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5472 hdr->res.scratch = kmalloc(32, GFP_KERNEL); 5473 return hdr->res.scratch != NULL; 5474 } 5475 return false; 5476 } 5477 #else 5478 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5479 struct rpc_message *msg) 5480 { 5481 return false; 5482 } 5483 #endif /* CONFIG_NFS_V4_2 */ 5484 5485 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5486 struct rpc_message *msg) 5487 { 5488 hdr->timestamp = jiffies; 5489 if (!hdr->pgio_done_cb) 5490 hdr->pgio_done_cb = nfs4_read_done_cb; 5491 if (!nfs42_read_plus_support(hdr, msg)) 5492 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5493 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5494 } 5495 5496 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5497 struct nfs_pgio_header *hdr) 5498 { 5499 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5500 &hdr->args.seq_args, 5501 &hdr->res.seq_res, 5502 task)) 5503 return 0; 5504 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5505 hdr->args.lock_context, 5506 hdr->rw_mode) == -EIO) 5507 return -EIO; 5508 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5509 return -EIO; 5510 return 0; 5511 } 5512 5513 static int nfs4_write_done_cb(struct rpc_task *task, 5514 struct nfs_pgio_header *hdr) 5515 { 5516 struct inode *inode = hdr->inode; 5517 5518 trace_nfs4_write(hdr, task->tk_status); 5519 if (task->tk_status < 0) { 5520 struct nfs4_exception exception = { 5521 .inode = hdr->inode, 5522 .state = hdr->args.context->state, 5523 .stateid = &hdr->args.stateid, 5524 }; 5525 task->tk_status = nfs4_async_handle_exception(task, 5526 NFS_SERVER(inode), task->tk_status, 5527 &exception); 5528 if (exception.retry) { 5529 rpc_restart_call_prepare(task); 5530 return -EAGAIN; 5531 } 5532 } 5533 if (task->tk_status >= 0) { 5534 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5535 nfs_writeback_update_inode(hdr); 5536 } 5537 return 0; 5538 } 5539 5540 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5541 struct nfs_pgio_args *args) 5542 { 5543 5544 if (!nfs4_error_stateid_expired(task->tk_status) || 5545 nfs4_stateid_is_current(&args->stateid, 5546 args->context, 5547 args->lock_context, 5548 FMODE_WRITE)) 5549 return false; 5550 rpc_restart_call_prepare(task); 5551 return true; 5552 } 5553 5554 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5555 { 5556 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5557 return -EAGAIN; 5558 if (nfs4_write_stateid_changed(task, &hdr->args)) 5559 return -EAGAIN; 5560 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5561 nfs4_write_done_cb(task, hdr); 5562 } 5563 5564 static 5565 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5566 { 5567 /* Don't request attributes for pNFS or O_DIRECT writes */ 5568 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5569 return false; 5570 /* Otherwise, request attributes if and only if we don't hold 5571 * a delegation 5572 */ 5573 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5574 } 5575 5576 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5577 struct inode *inode, unsigned long cache_validity) 5578 { 5579 struct nfs_server *server = NFS_SERVER(inode); 5580 unsigned int i; 5581 5582 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5583 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5584 5585 if (cache_validity & NFS_INO_INVALID_CHANGE) 5586 bitmask[0] |= FATTR4_WORD0_CHANGE; 5587 if (cache_validity & NFS_INO_INVALID_ATIME) 5588 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5589 if (cache_validity & NFS_INO_INVALID_MODE) 5590 bitmask[1] |= FATTR4_WORD1_MODE; 5591 if (cache_validity & NFS_INO_INVALID_OTHER) 5592 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5593 if (cache_validity & NFS_INO_INVALID_NLINK) 5594 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5595 if (cache_validity & NFS_INO_INVALID_CTIME) 5596 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5597 if (cache_validity & NFS_INO_INVALID_MTIME) 5598 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5599 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5600 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5601 5602 if (cache_validity & NFS_INO_INVALID_SIZE) 5603 bitmask[0] |= FATTR4_WORD0_SIZE; 5604 5605 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5606 bitmask[i] &= server->attr_bitmask[i]; 5607 } 5608 5609 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5610 struct rpc_message *msg, 5611 struct rpc_clnt **clnt) 5612 { 5613 struct nfs_server *server = NFS_SERVER(hdr->inode); 5614 5615 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5616 hdr->args.bitmask = NULL; 5617 hdr->res.fattr = NULL; 5618 } else { 5619 nfs4_bitmask_set(hdr->args.bitmask_store, 5620 server->cache_consistency_bitmask, 5621 hdr->inode, NFS_INO_INVALID_BLOCKS); 5622 hdr->args.bitmask = hdr->args.bitmask_store; 5623 } 5624 5625 if (!hdr->pgio_done_cb) 5626 hdr->pgio_done_cb = nfs4_write_done_cb; 5627 hdr->res.server = server; 5628 hdr->timestamp = jiffies; 5629 5630 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5631 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5632 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5633 } 5634 5635 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5636 { 5637 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5638 &data->args.seq_args, 5639 &data->res.seq_res, 5640 task); 5641 } 5642 5643 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5644 { 5645 struct inode *inode = data->inode; 5646 5647 trace_nfs4_commit(data, task->tk_status); 5648 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5649 NULL, NULL) == -EAGAIN) { 5650 rpc_restart_call_prepare(task); 5651 return -EAGAIN; 5652 } 5653 return 0; 5654 } 5655 5656 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5657 { 5658 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5659 return -EAGAIN; 5660 return data->commit_done_cb(task, data); 5661 } 5662 5663 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5664 struct rpc_clnt **clnt) 5665 { 5666 struct nfs_server *server = NFS_SERVER(data->inode); 5667 5668 if (data->commit_done_cb == NULL) 5669 data->commit_done_cb = nfs4_commit_done_cb; 5670 data->res.server = server; 5671 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5672 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5673 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5674 } 5675 5676 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5677 struct nfs_commitres *res) 5678 { 5679 struct inode *dst_inode = file_inode(dst); 5680 struct nfs_server *server = NFS_SERVER(dst_inode); 5681 struct rpc_message msg = { 5682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5683 .rpc_argp = args, 5684 .rpc_resp = res, 5685 }; 5686 5687 args->fh = NFS_FH(dst_inode); 5688 return nfs4_call_sync(server->client, server, &msg, 5689 &args->seq_args, &res->seq_res, 1); 5690 } 5691 5692 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5693 { 5694 struct nfs_commitargs args = { 5695 .offset = offset, 5696 .count = count, 5697 }; 5698 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5699 struct nfs4_exception exception = { }; 5700 int status; 5701 5702 do { 5703 status = _nfs4_proc_commit(dst, &args, res); 5704 status = nfs4_handle_exception(dst_server, status, &exception); 5705 } while (exception.retry); 5706 5707 return status; 5708 } 5709 5710 struct nfs4_renewdata { 5711 struct nfs_client *client; 5712 unsigned long timestamp; 5713 }; 5714 5715 /* 5716 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5717 * standalone procedure for queueing an asynchronous RENEW. 5718 */ 5719 static void nfs4_renew_release(void *calldata) 5720 { 5721 struct nfs4_renewdata *data = calldata; 5722 struct nfs_client *clp = data->client; 5723 5724 if (refcount_read(&clp->cl_count) > 1) 5725 nfs4_schedule_state_renewal(clp); 5726 nfs_put_client(clp); 5727 kfree(data); 5728 } 5729 5730 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5731 { 5732 struct nfs4_renewdata *data = calldata; 5733 struct nfs_client *clp = data->client; 5734 unsigned long timestamp = data->timestamp; 5735 5736 trace_nfs4_renew_async(clp, task->tk_status); 5737 switch (task->tk_status) { 5738 case 0: 5739 break; 5740 case -NFS4ERR_LEASE_MOVED: 5741 nfs4_schedule_lease_moved_recovery(clp); 5742 break; 5743 default: 5744 /* Unless we're shutting down, schedule state recovery! */ 5745 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5746 return; 5747 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5748 nfs4_schedule_lease_recovery(clp); 5749 return; 5750 } 5751 nfs4_schedule_path_down_recovery(clp); 5752 } 5753 do_renew_lease(clp, timestamp); 5754 } 5755 5756 static const struct rpc_call_ops nfs4_renew_ops = { 5757 .rpc_call_done = nfs4_renew_done, 5758 .rpc_release = nfs4_renew_release, 5759 }; 5760 5761 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5762 { 5763 struct rpc_message msg = { 5764 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5765 .rpc_argp = clp, 5766 .rpc_cred = cred, 5767 }; 5768 struct nfs4_renewdata *data; 5769 5770 if (renew_flags == 0) 5771 return 0; 5772 if (!refcount_inc_not_zero(&clp->cl_count)) 5773 return -EIO; 5774 data = kmalloc(sizeof(*data), GFP_NOFS); 5775 if (data == NULL) { 5776 nfs_put_client(clp); 5777 return -ENOMEM; 5778 } 5779 data->client = clp; 5780 data->timestamp = jiffies; 5781 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5782 &nfs4_renew_ops, data); 5783 } 5784 5785 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5786 { 5787 struct rpc_message msg = { 5788 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5789 .rpc_argp = clp, 5790 .rpc_cred = cred, 5791 }; 5792 unsigned long now = jiffies; 5793 int status; 5794 5795 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5796 if (status < 0) 5797 return status; 5798 do_renew_lease(clp, now); 5799 return 0; 5800 } 5801 5802 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5803 enum nfs4_acl_type type) 5804 { 5805 switch (type) { 5806 default: 5807 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5808 case NFS4ACL_DACL: 5809 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5810 case NFS4ACL_SACL: 5811 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5812 } 5813 } 5814 5815 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5816 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5817 * the stack. 5818 */ 5819 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5820 5821 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5822 struct page **pages) 5823 { 5824 struct page *newpage, **spages; 5825 int rc = 0; 5826 size_t len; 5827 spages = pages; 5828 5829 do { 5830 len = min_t(size_t, PAGE_SIZE, buflen); 5831 newpage = alloc_page(GFP_KERNEL); 5832 5833 if (newpage == NULL) 5834 goto unwind; 5835 memcpy(page_address(newpage), buf, len); 5836 buf += len; 5837 buflen -= len; 5838 *pages++ = newpage; 5839 rc++; 5840 } while (buflen != 0); 5841 5842 return rc; 5843 5844 unwind: 5845 for(; rc > 0; rc--) 5846 __free_page(spages[rc-1]); 5847 return -ENOMEM; 5848 } 5849 5850 struct nfs4_cached_acl { 5851 enum nfs4_acl_type type; 5852 int cached; 5853 size_t len; 5854 char data[]; 5855 }; 5856 5857 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5858 { 5859 struct nfs_inode *nfsi = NFS_I(inode); 5860 5861 spin_lock(&inode->i_lock); 5862 kfree(nfsi->nfs4_acl); 5863 nfsi->nfs4_acl = acl; 5864 spin_unlock(&inode->i_lock); 5865 } 5866 5867 static void nfs4_zap_acl_attr(struct inode *inode) 5868 { 5869 nfs4_set_cached_acl(inode, NULL); 5870 } 5871 5872 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5873 size_t buflen, enum nfs4_acl_type type) 5874 { 5875 struct nfs_inode *nfsi = NFS_I(inode); 5876 struct nfs4_cached_acl *acl; 5877 int ret = -ENOENT; 5878 5879 spin_lock(&inode->i_lock); 5880 acl = nfsi->nfs4_acl; 5881 if (acl == NULL) 5882 goto out; 5883 if (acl->type != type) 5884 goto out; 5885 if (buf == NULL) /* user is just asking for length */ 5886 goto out_len; 5887 if (acl->cached == 0) 5888 goto out; 5889 ret = -ERANGE; /* see getxattr(2) man page */ 5890 if (acl->len > buflen) 5891 goto out; 5892 memcpy(buf, acl->data, acl->len); 5893 out_len: 5894 ret = acl->len; 5895 out: 5896 spin_unlock(&inode->i_lock); 5897 return ret; 5898 } 5899 5900 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5901 size_t pgbase, size_t acl_len, 5902 enum nfs4_acl_type type) 5903 { 5904 struct nfs4_cached_acl *acl; 5905 size_t buflen = sizeof(*acl) + acl_len; 5906 5907 if (buflen <= PAGE_SIZE) { 5908 acl = kmalloc(buflen, GFP_KERNEL); 5909 if (acl == NULL) 5910 goto out; 5911 acl->cached = 1; 5912 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5913 } else { 5914 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5915 if (acl == NULL) 5916 goto out; 5917 acl->cached = 0; 5918 } 5919 acl->type = type; 5920 acl->len = acl_len; 5921 out: 5922 nfs4_set_cached_acl(inode, acl); 5923 } 5924 5925 /* 5926 * The getxattr API returns the required buffer length when called with a 5927 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5928 * the required buf. On a NULL buf, we send a page of data to the server 5929 * guessing that the ACL request can be serviced by a page. If so, we cache 5930 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5931 * the cache. If not so, we throw away the page, and cache the required 5932 * length. The next getxattr call will then produce another round trip to 5933 * the server, this time with the input buf of the required size. 5934 */ 5935 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5936 size_t buflen, enum nfs4_acl_type type) 5937 { 5938 struct page **pages; 5939 struct nfs_getaclargs args = { 5940 .fh = NFS_FH(inode), 5941 .acl_type = type, 5942 .acl_len = buflen, 5943 }; 5944 struct nfs_getaclres res = { 5945 .acl_type = type, 5946 .acl_len = buflen, 5947 }; 5948 struct rpc_message msg = { 5949 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5950 .rpc_argp = &args, 5951 .rpc_resp = &res, 5952 }; 5953 unsigned int npages; 5954 int ret = -ENOMEM, i; 5955 struct nfs_server *server = NFS_SERVER(inode); 5956 5957 if (buflen == 0) 5958 buflen = server->rsize; 5959 5960 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5961 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5962 if (!pages) 5963 return -ENOMEM; 5964 5965 args.acl_pages = pages; 5966 5967 for (i = 0; i < npages; i++) { 5968 pages[i] = alloc_page(GFP_KERNEL); 5969 if (!pages[i]) 5970 goto out_free; 5971 } 5972 5973 /* for decoding across pages */ 5974 res.acl_scratch = alloc_page(GFP_KERNEL); 5975 if (!res.acl_scratch) 5976 goto out_free; 5977 5978 args.acl_len = npages * PAGE_SIZE; 5979 5980 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5981 __func__, buf, buflen, npages, args.acl_len); 5982 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5983 &msg, &args.seq_args, &res.seq_res, 0); 5984 if (ret) 5985 goto out_free; 5986 5987 /* Handle the case where the passed-in buffer is too short */ 5988 if (res.acl_flags & NFS4_ACL_TRUNC) { 5989 /* Did the user only issue a request for the acl length? */ 5990 if (buf == NULL) 5991 goto out_ok; 5992 ret = -ERANGE; 5993 goto out_free; 5994 } 5995 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5996 type); 5997 if (buf) { 5998 if (res.acl_len > buflen) { 5999 ret = -ERANGE; 6000 goto out_free; 6001 } 6002 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 6003 } 6004 out_ok: 6005 ret = res.acl_len; 6006 out_free: 6007 for (i = 0; i < npages; i++) 6008 if (pages[i]) 6009 __free_page(pages[i]); 6010 if (res.acl_scratch) 6011 __free_page(res.acl_scratch); 6012 kfree(pages); 6013 return ret; 6014 } 6015 6016 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6017 size_t buflen, enum nfs4_acl_type type) 6018 { 6019 struct nfs4_exception exception = { 6020 .interruptible = true, 6021 }; 6022 ssize_t ret; 6023 do { 6024 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6025 trace_nfs4_get_acl(inode, ret); 6026 if (ret >= 0) 6027 break; 6028 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6029 } while (exception.retry); 6030 return ret; 6031 } 6032 6033 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6034 enum nfs4_acl_type type) 6035 { 6036 struct nfs_server *server = NFS_SERVER(inode); 6037 int ret; 6038 6039 if (!nfs4_server_supports_acls(server, type)) 6040 return -EOPNOTSUPP; 6041 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6042 if (ret < 0) 6043 return ret; 6044 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6045 nfs_zap_acl_cache(inode); 6046 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6047 if (ret != -ENOENT) 6048 /* -ENOENT is returned if there is no ACL or if there is an ACL 6049 * but no cached acl data, just the acl length */ 6050 return ret; 6051 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6052 } 6053 6054 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6055 size_t buflen, enum nfs4_acl_type type) 6056 { 6057 struct nfs_server *server = NFS_SERVER(inode); 6058 struct page *pages[NFS4ACL_MAXPAGES]; 6059 struct nfs_setaclargs arg = { 6060 .fh = NFS_FH(inode), 6061 .acl_type = type, 6062 .acl_len = buflen, 6063 .acl_pages = pages, 6064 }; 6065 struct nfs_setaclres res; 6066 struct rpc_message msg = { 6067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6068 .rpc_argp = &arg, 6069 .rpc_resp = &res, 6070 }; 6071 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6072 int ret, i; 6073 6074 /* You can't remove system.nfs4_acl: */ 6075 if (buflen == 0) 6076 return -EINVAL; 6077 if (!nfs4_server_supports_acls(server, type)) 6078 return -EOPNOTSUPP; 6079 if (npages > ARRAY_SIZE(pages)) 6080 return -ERANGE; 6081 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6082 if (i < 0) 6083 return i; 6084 nfs4_inode_make_writeable(inode); 6085 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6086 6087 /* 6088 * Free each page after tx, so the only ref left is 6089 * held by the network stack 6090 */ 6091 for (; i > 0; i--) 6092 put_page(pages[i-1]); 6093 6094 /* 6095 * Acl update can result in inode attribute update. 6096 * so mark the attribute cache invalid. 6097 */ 6098 spin_lock(&inode->i_lock); 6099 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6100 NFS_INO_INVALID_CTIME | 6101 NFS_INO_REVAL_FORCED); 6102 spin_unlock(&inode->i_lock); 6103 nfs_access_zap_cache(inode); 6104 nfs_zap_acl_cache(inode); 6105 return ret; 6106 } 6107 6108 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6109 size_t buflen, enum nfs4_acl_type type) 6110 { 6111 struct nfs4_exception exception = { }; 6112 int err; 6113 do { 6114 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6115 trace_nfs4_set_acl(inode, err); 6116 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6117 /* 6118 * no need to retry since the kernel 6119 * isn't involved in encoding the ACEs. 6120 */ 6121 err = -EINVAL; 6122 break; 6123 } 6124 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6125 &exception); 6126 } while (exception.retry); 6127 return err; 6128 } 6129 6130 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6131 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6132 size_t buflen) 6133 { 6134 struct nfs_server *server = NFS_SERVER(inode); 6135 struct nfs4_label label = {0, 0, buflen, buf}; 6136 6137 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6138 struct nfs_fattr fattr = { 6139 .label = &label, 6140 }; 6141 struct nfs4_getattr_arg arg = { 6142 .fh = NFS_FH(inode), 6143 .bitmask = bitmask, 6144 }; 6145 struct nfs4_getattr_res res = { 6146 .fattr = &fattr, 6147 .server = server, 6148 }; 6149 struct rpc_message msg = { 6150 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6151 .rpc_argp = &arg, 6152 .rpc_resp = &res, 6153 }; 6154 int ret; 6155 6156 nfs_fattr_init(&fattr); 6157 6158 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6159 if (ret) 6160 return ret; 6161 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6162 return -ENOENT; 6163 return label.len; 6164 } 6165 6166 static int nfs4_get_security_label(struct inode *inode, void *buf, 6167 size_t buflen) 6168 { 6169 struct nfs4_exception exception = { 6170 .interruptible = true, 6171 }; 6172 int err; 6173 6174 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6175 return -EOPNOTSUPP; 6176 6177 do { 6178 err = _nfs4_get_security_label(inode, buf, buflen); 6179 trace_nfs4_get_security_label(inode, err); 6180 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6181 &exception); 6182 } while (exception.retry); 6183 return err; 6184 } 6185 6186 static int _nfs4_do_set_security_label(struct inode *inode, 6187 struct nfs4_label *ilabel, 6188 struct nfs_fattr *fattr) 6189 { 6190 6191 struct iattr sattr = {0}; 6192 struct nfs_server *server = NFS_SERVER(inode); 6193 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6194 struct nfs_setattrargs arg = { 6195 .fh = NFS_FH(inode), 6196 .iap = &sattr, 6197 .server = server, 6198 .bitmask = bitmask, 6199 .label = ilabel, 6200 }; 6201 struct nfs_setattrres res = { 6202 .fattr = fattr, 6203 .server = server, 6204 }; 6205 struct rpc_message msg = { 6206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6207 .rpc_argp = &arg, 6208 .rpc_resp = &res, 6209 }; 6210 int status; 6211 6212 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6213 6214 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6215 if (status) 6216 dprintk("%s failed: %d\n", __func__, status); 6217 6218 return status; 6219 } 6220 6221 static int nfs4_do_set_security_label(struct inode *inode, 6222 struct nfs4_label *ilabel, 6223 struct nfs_fattr *fattr) 6224 { 6225 struct nfs4_exception exception = { }; 6226 int err; 6227 6228 do { 6229 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6230 trace_nfs4_set_security_label(inode, err); 6231 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6232 &exception); 6233 } while (exception.retry); 6234 return err; 6235 } 6236 6237 static int 6238 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6239 { 6240 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6241 struct nfs_fattr *fattr; 6242 int status; 6243 6244 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6245 return -EOPNOTSUPP; 6246 6247 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6248 if (fattr == NULL) 6249 return -ENOMEM; 6250 6251 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6252 if (status == 0) 6253 nfs_setsecurity(inode, fattr); 6254 6255 return status; 6256 } 6257 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6258 6259 6260 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6261 nfs4_verifier *bootverf) 6262 { 6263 __be32 verf[2]; 6264 6265 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6266 /* An impossible timestamp guarantees this value 6267 * will never match a generated boot time. */ 6268 verf[0] = cpu_to_be32(U32_MAX); 6269 verf[1] = cpu_to_be32(U32_MAX); 6270 } else { 6271 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6272 u64 ns = ktime_to_ns(nn->boot_time); 6273 6274 verf[0] = cpu_to_be32(ns >> 32); 6275 verf[1] = cpu_to_be32(ns); 6276 } 6277 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6278 } 6279 6280 static size_t 6281 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6282 { 6283 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6284 struct nfs_netns_client *nn_clp = nn->nfs_client; 6285 const char *id; 6286 6287 buf[0] = '\0'; 6288 6289 if (nn_clp) { 6290 rcu_read_lock(); 6291 id = rcu_dereference(nn_clp->identifier); 6292 if (id) 6293 strscpy(buf, id, buflen); 6294 rcu_read_unlock(); 6295 } 6296 6297 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6298 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6299 6300 return strlen(buf); 6301 } 6302 6303 static int 6304 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6305 { 6306 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6307 size_t buflen; 6308 size_t len; 6309 char *str; 6310 6311 if (clp->cl_owner_id != NULL) 6312 return 0; 6313 6314 rcu_read_lock(); 6315 len = 14 + 6316 strlen(clp->cl_rpcclient->cl_nodename) + 6317 1 + 6318 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6319 1; 6320 rcu_read_unlock(); 6321 6322 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6323 if (buflen) 6324 len += buflen + 1; 6325 6326 if (len > NFS4_OPAQUE_LIMIT + 1) 6327 return -EINVAL; 6328 6329 /* 6330 * Since this string is allocated at mount time, and held until the 6331 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6332 * about a memory-reclaim deadlock. 6333 */ 6334 str = kmalloc(len, GFP_KERNEL); 6335 if (!str) 6336 return -ENOMEM; 6337 6338 rcu_read_lock(); 6339 if (buflen) 6340 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6341 clp->cl_rpcclient->cl_nodename, buf, 6342 rpc_peeraddr2str(clp->cl_rpcclient, 6343 RPC_DISPLAY_ADDR)); 6344 else 6345 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6346 clp->cl_rpcclient->cl_nodename, 6347 rpc_peeraddr2str(clp->cl_rpcclient, 6348 RPC_DISPLAY_ADDR)); 6349 rcu_read_unlock(); 6350 6351 clp->cl_owner_id = str; 6352 return 0; 6353 } 6354 6355 static int 6356 nfs4_init_uniform_client_string(struct nfs_client *clp) 6357 { 6358 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6359 size_t buflen; 6360 size_t len; 6361 char *str; 6362 6363 if (clp->cl_owner_id != NULL) 6364 return 0; 6365 6366 len = 10 + 10 + 1 + 10 + 1 + 6367 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6368 6369 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6370 if (buflen) 6371 len += buflen + 1; 6372 6373 if (len > NFS4_OPAQUE_LIMIT + 1) 6374 return -EINVAL; 6375 6376 /* 6377 * Since this string is allocated at mount time, and held until the 6378 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6379 * about a memory-reclaim deadlock. 6380 */ 6381 str = kmalloc(len, GFP_KERNEL); 6382 if (!str) 6383 return -ENOMEM; 6384 6385 if (buflen) 6386 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6387 clp->rpc_ops->version, clp->cl_minorversion, 6388 buf, clp->cl_rpcclient->cl_nodename); 6389 else 6390 scnprintf(str, len, "Linux NFSv%u.%u %s", 6391 clp->rpc_ops->version, clp->cl_minorversion, 6392 clp->cl_rpcclient->cl_nodename); 6393 clp->cl_owner_id = str; 6394 return 0; 6395 } 6396 6397 /* 6398 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6399 * services. Advertise one based on the address family of the 6400 * clientaddr. 6401 */ 6402 static unsigned int 6403 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6404 { 6405 if (strchr(clp->cl_ipaddr, ':') != NULL) 6406 return scnprintf(buf, len, "tcp6"); 6407 else 6408 return scnprintf(buf, len, "tcp"); 6409 } 6410 6411 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6412 { 6413 struct nfs4_setclientid *sc = calldata; 6414 6415 if (task->tk_status == 0) 6416 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6417 } 6418 6419 static const struct rpc_call_ops nfs4_setclientid_ops = { 6420 .rpc_call_done = nfs4_setclientid_done, 6421 }; 6422 6423 /** 6424 * nfs4_proc_setclientid - Negotiate client ID 6425 * @clp: state data structure 6426 * @program: RPC program for NFSv4 callback service 6427 * @port: IP port number for NFS4 callback service 6428 * @cred: credential to use for this call 6429 * @res: where to place the result 6430 * 6431 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6432 */ 6433 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6434 unsigned short port, const struct cred *cred, 6435 struct nfs4_setclientid_res *res) 6436 { 6437 nfs4_verifier sc_verifier; 6438 struct nfs4_setclientid setclientid = { 6439 .sc_verifier = &sc_verifier, 6440 .sc_prog = program, 6441 .sc_clnt = clp, 6442 }; 6443 struct rpc_message msg = { 6444 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6445 .rpc_argp = &setclientid, 6446 .rpc_resp = res, 6447 .rpc_cred = cred, 6448 }; 6449 struct rpc_task_setup task_setup_data = { 6450 .rpc_client = clp->cl_rpcclient, 6451 .rpc_message = &msg, 6452 .callback_ops = &nfs4_setclientid_ops, 6453 .callback_data = &setclientid, 6454 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6455 }; 6456 unsigned long now = jiffies; 6457 int status; 6458 6459 /* nfs_client_id4 */ 6460 nfs4_init_boot_verifier(clp, &sc_verifier); 6461 6462 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6463 status = nfs4_init_uniform_client_string(clp); 6464 else 6465 status = nfs4_init_nonuniform_client_string(clp); 6466 6467 if (status) 6468 goto out; 6469 6470 /* cb_client4 */ 6471 setclientid.sc_netid_len = 6472 nfs4_init_callback_netid(clp, 6473 setclientid.sc_netid, 6474 sizeof(setclientid.sc_netid)); 6475 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6476 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6477 clp->cl_ipaddr, port >> 8, port & 255); 6478 6479 dprintk("NFS call setclientid auth=%s, '%s'\n", 6480 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6481 clp->cl_owner_id); 6482 6483 status = nfs4_call_sync_custom(&task_setup_data); 6484 if (setclientid.sc_cred) { 6485 kfree(clp->cl_acceptor); 6486 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6487 put_rpccred(setclientid.sc_cred); 6488 } 6489 6490 if (status == 0) 6491 do_renew_lease(clp, now); 6492 out: 6493 trace_nfs4_setclientid(clp, status); 6494 dprintk("NFS reply setclientid: %d\n", status); 6495 return status; 6496 } 6497 6498 /** 6499 * nfs4_proc_setclientid_confirm - Confirm client ID 6500 * @clp: state data structure 6501 * @arg: result of a previous SETCLIENTID 6502 * @cred: credential to use for this call 6503 * 6504 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6505 */ 6506 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6507 struct nfs4_setclientid_res *arg, 6508 const struct cred *cred) 6509 { 6510 struct rpc_message msg = { 6511 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6512 .rpc_argp = arg, 6513 .rpc_cred = cred, 6514 }; 6515 int status; 6516 6517 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6518 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6519 clp->cl_clientid); 6520 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6521 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6522 trace_nfs4_setclientid_confirm(clp, status); 6523 dprintk("NFS reply setclientid_confirm: %d\n", status); 6524 return status; 6525 } 6526 6527 struct nfs4_delegreturndata { 6528 struct nfs4_delegreturnargs args; 6529 struct nfs4_delegreturnres res; 6530 struct nfs_fh fh; 6531 nfs4_stateid stateid; 6532 unsigned long timestamp; 6533 struct { 6534 struct nfs4_layoutreturn_args arg; 6535 struct nfs4_layoutreturn_res res; 6536 struct nfs4_xdr_opaque_data ld_private; 6537 u32 roc_barrier; 6538 bool roc; 6539 } lr; 6540 struct nfs_fattr fattr; 6541 int rpc_status; 6542 struct inode *inode; 6543 }; 6544 6545 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6546 { 6547 struct nfs4_delegreturndata *data = calldata; 6548 struct nfs4_exception exception = { 6549 .inode = data->inode, 6550 .stateid = &data->stateid, 6551 .task_is_privileged = data->args.seq_args.sa_privileged, 6552 }; 6553 6554 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6555 return; 6556 6557 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6558 6559 /* Handle Layoutreturn errors */ 6560 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6561 &data->res.lr_ret) == -EAGAIN) 6562 goto out_restart; 6563 6564 switch (task->tk_status) { 6565 case 0: 6566 renew_lease(data->res.server, data->timestamp); 6567 break; 6568 case -NFS4ERR_ADMIN_REVOKED: 6569 case -NFS4ERR_DELEG_REVOKED: 6570 case -NFS4ERR_EXPIRED: 6571 nfs4_free_revoked_stateid(data->res.server, 6572 data->args.stateid, 6573 task->tk_msg.rpc_cred); 6574 fallthrough; 6575 case -NFS4ERR_BAD_STATEID: 6576 case -NFS4ERR_STALE_STATEID: 6577 case -ETIMEDOUT: 6578 task->tk_status = 0; 6579 break; 6580 case -NFS4ERR_OLD_STATEID: 6581 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6582 nfs4_stateid_seqid_inc(&data->stateid); 6583 if (data->args.bitmask) { 6584 data->args.bitmask = NULL; 6585 data->res.fattr = NULL; 6586 } 6587 goto out_restart; 6588 case -NFS4ERR_ACCESS: 6589 if (data->args.bitmask) { 6590 data->args.bitmask = NULL; 6591 data->res.fattr = NULL; 6592 goto out_restart; 6593 } 6594 fallthrough; 6595 default: 6596 task->tk_status = nfs4_async_handle_exception(task, 6597 data->res.server, task->tk_status, 6598 &exception); 6599 if (exception.retry) 6600 goto out_restart; 6601 } 6602 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6603 data->rpc_status = task->tk_status; 6604 return; 6605 out_restart: 6606 task->tk_status = 0; 6607 rpc_restart_call_prepare(task); 6608 } 6609 6610 static void nfs4_delegreturn_release(void *calldata) 6611 { 6612 struct nfs4_delegreturndata *data = calldata; 6613 struct inode *inode = data->inode; 6614 6615 if (data->lr.roc) 6616 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6617 data->res.lr_ret); 6618 if (inode) { 6619 nfs4_fattr_set_prechange(&data->fattr, 6620 inode_peek_iversion_raw(inode)); 6621 nfs_refresh_inode(inode, &data->fattr); 6622 nfs_iput_and_deactive(inode); 6623 } 6624 kfree(calldata); 6625 } 6626 6627 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6628 { 6629 struct nfs4_delegreturndata *d_data; 6630 struct pnfs_layout_hdr *lo; 6631 6632 d_data = data; 6633 6634 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6635 nfs4_sequence_done(task, &d_data->res.seq_res); 6636 return; 6637 } 6638 6639 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6640 if (lo && !pnfs_layout_is_valid(lo)) { 6641 d_data->args.lr_args = NULL; 6642 d_data->res.lr_res = NULL; 6643 } 6644 6645 nfs4_setup_sequence(d_data->res.server->nfs_client, 6646 &d_data->args.seq_args, 6647 &d_data->res.seq_res, 6648 task); 6649 } 6650 6651 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6652 .rpc_call_prepare = nfs4_delegreturn_prepare, 6653 .rpc_call_done = nfs4_delegreturn_done, 6654 .rpc_release = nfs4_delegreturn_release, 6655 }; 6656 6657 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6658 { 6659 struct nfs4_delegreturndata *data; 6660 struct nfs_server *server = NFS_SERVER(inode); 6661 struct rpc_task *task; 6662 struct rpc_message msg = { 6663 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6664 .rpc_cred = cred, 6665 }; 6666 struct rpc_task_setup task_setup_data = { 6667 .rpc_client = server->client, 6668 .rpc_message = &msg, 6669 .callback_ops = &nfs4_delegreturn_ops, 6670 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6671 }; 6672 int status = 0; 6673 6674 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6675 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6676 6677 data = kzalloc(sizeof(*data), GFP_KERNEL); 6678 if (data == NULL) 6679 return -ENOMEM; 6680 6681 nfs4_state_protect(server->nfs_client, 6682 NFS_SP4_MACH_CRED_CLEANUP, 6683 &task_setup_data.rpc_client, &msg); 6684 6685 data->args.fhandle = &data->fh; 6686 data->args.stateid = &data->stateid; 6687 nfs4_bitmask_set(data->args.bitmask_store, 6688 server->cache_consistency_bitmask, inode, 0); 6689 data->args.bitmask = data->args.bitmask_store; 6690 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6691 nfs4_stateid_copy(&data->stateid, stateid); 6692 data->res.fattr = &data->fattr; 6693 data->res.server = server; 6694 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6695 data->lr.arg.ld_private = &data->lr.ld_private; 6696 nfs_fattr_init(data->res.fattr); 6697 data->timestamp = jiffies; 6698 data->rpc_status = 0; 6699 data->inode = nfs_igrab_and_active(inode); 6700 if (data->inode || issync) { 6701 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6702 cred); 6703 if (data->lr.roc) { 6704 data->args.lr_args = &data->lr.arg; 6705 data->res.lr_res = &data->lr.res; 6706 } 6707 } 6708 6709 if (!data->inode) 6710 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6711 1); 6712 else 6713 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6714 0); 6715 task_setup_data.callback_data = data; 6716 msg.rpc_argp = &data->args; 6717 msg.rpc_resp = &data->res; 6718 task = rpc_run_task(&task_setup_data); 6719 if (IS_ERR(task)) 6720 return PTR_ERR(task); 6721 if (!issync) 6722 goto out; 6723 status = rpc_wait_for_completion_task(task); 6724 if (status != 0) 6725 goto out; 6726 status = data->rpc_status; 6727 out: 6728 rpc_put_task(task); 6729 return status; 6730 } 6731 6732 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6733 { 6734 struct nfs_server *server = NFS_SERVER(inode); 6735 struct nfs4_exception exception = { }; 6736 int err; 6737 do { 6738 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6739 trace_nfs4_delegreturn(inode, stateid, err); 6740 switch (err) { 6741 case -NFS4ERR_STALE_STATEID: 6742 case -NFS4ERR_EXPIRED: 6743 case 0: 6744 return 0; 6745 } 6746 err = nfs4_handle_exception(server, err, &exception); 6747 } while (exception.retry); 6748 return err; 6749 } 6750 6751 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6752 { 6753 struct inode *inode = state->inode; 6754 struct nfs_server *server = NFS_SERVER(inode); 6755 struct nfs_client *clp = server->nfs_client; 6756 struct nfs_lockt_args arg = { 6757 .fh = NFS_FH(inode), 6758 .fl = request, 6759 }; 6760 struct nfs_lockt_res res = { 6761 .denied = request, 6762 }; 6763 struct rpc_message msg = { 6764 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6765 .rpc_argp = &arg, 6766 .rpc_resp = &res, 6767 .rpc_cred = state->owner->so_cred, 6768 }; 6769 struct nfs4_lock_state *lsp; 6770 int status; 6771 6772 arg.lock_owner.clientid = clp->cl_clientid; 6773 status = nfs4_set_lock_state(state, request); 6774 if (status != 0) 6775 goto out; 6776 lsp = request->fl_u.nfs4_fl.owner; 6777 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6778 arg.lock_owner.s_dev = server->s_dev; 6779 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6780 switch (status) { 6781 case 0: 6782 request->fl_type = F_UNLCK; 6783 break; 6784 case -NFS4ERR_DENIED: 6785 status = 0; 6786 } 6787 request->fl_ops->fl_release_private(request); 6788 request->fl_ops = NULL; 6789 out: 6790 return status; 6791 } 6792 6793 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6794 { 6795 struct nfs4_exception exception = { 6796 .interruptible = true, 6797 }; 6798 int err; 6799 6800 do { 6801 err = _nfs4_proc_getlk(state, cmd, request); 6802 trace_nfs4_get_lock(request, state, cmd, err); 6803 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6804 &exception); 6805 } while (exception.retry); 6806 return err; 6807 } 6808 6809 /* 6810 * Update the seqid of a lock stateid after receiving 6811 * NFS4ERR_OLD_STATEID 6812 */ 6813 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6814 struct nfs4_lock_state *lsp) 6815 { 6816 struct nfs4_state *state = lsp->ls_state; 6817 bool ret = false; 6818 6819 spin_lock(&state->state_lock); 6820 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6821 goto out; 6822 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6823 nfs4_stateid_seqid_inc(dst); 6824 else 6825 dst->seqid = lsp->ls_stateid.seqid; 6826 ret = true; 6827 out: 6828 spin_unlock(&state->state_lock); 6829 return ret; 6830 } 6831 6832 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6833 struct nfs4_lock_state *lsp) 6834 { 6835 struct nfs4_state *state = lsp->ls_state; 6836 bool ret; 6837 6838 spin_lock(&state->state_lock); 6839 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6840 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6841 spin_unlock(&state->state_lock); 6842 return ret; 6843 } 6844 6845 struct nfs4_unlockdata { 6846 struct nfs_locku_args arg; 6847 struct nfs_locku_res res; 6848 struct nfs4_lock_state *lsp; 6849 struct nfs_open_context *ctx; 6850 struct nfs_lock_context *l_ctx; 6851 struct file_lock fl; 6852 struct nfs_server *server; 6853 unsigned long timestamp; 6854 }; 6855 6856 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6857 struct nfs_open_context *ctx, 6858 struct nfs4_lock_state *lsp, 6859 struct nfs_seqid *seqid) 6860 { 6861 struct nfs4_unlockdata *p; 6862 struct nfs4_state *state = lsp->ls_state; 6863 struct inode *inode = state->inode; 6864 6865 p = kzalloc(sizeof(*p), GFP_KERNEL); 6866 if (p == NULL) 6867 return NULL; 6868 p->arg.fh = NFS_FH(inode); 6869 p->arg.fl = &p->fl; 6870 p->arg.seqid = seqid; 6871 p->res.seqid = seqid; 6872 p->lsp = lsp; 6873 /* Ensure we don't close file until we're done freeing locks! */ 6874 p->ctx = get_nfs_open_context(ctx); 6875 p->l_ctx = nfs_get_lock_context(ctx); 6876 locks_init_lock(&p->fl); 6877 locks_copy_lock(&p->fl, fl); 6878 p->server = NFS_SERVER(inode); 6879 spin_lock(&state->state_lock); 6880 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6881 spin_unlock(&state->state_lock); 6882 return p; 6883 } 6884 6885 static void nfs4_locku_release_calldata(void *data) 6886 { 6887 struct nfs4_unlockdata *calldata = data; 6888 nfs_free_seqid(calldata->arg.seqid); 6889 nfs4_put_lock_state(calldata->lsp); 6890 nfs_put_lock_context(calldata->l_ctx); 6891 put_nfs_open_context(calldata->ctx); 6892 kfree(calldata); 6893 } 6894 6895 static void nfs4_locku_done(struct rpc_task *task, void *data) 6896 { 6897 struct nfs4_unlockdata *calldata = data; 6898 struct nfs4_exception exception = { 6899 .inode = calldata->lsp->ls_state->inode, 6900 .stateid = &calldata->arg.stateid, 6901 }; 6902 6903 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6904 return; 6905 switch (task->tk_status) { 6906 case 0: 6907 renew_lease(calldata->server, calldata->timestamp); 6908 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6909 if (nfs4_update_lock_stateid(calldata->lsp, 6910 &calldata->res.stateid)) 6911 break; 6912 fallthrough; 6913 case -NFS4ERR_ADMIN_REVOKED: 6914 case -NFS4ERR_EXPIRED: 6915 nfs4_free_revoked_stateid(calldata->server, 6916 &calldata->arg.stateid, 6917 task->tk_msg.rpc_cred); 6918 fallthrough; 6919 case -NFS4ERR_BAD_STATEID: 6920 case -NFS4ERR_STALE_STATEID: 6921 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6922 calldata->lsp)) 6923 rpc_restart_call_prepare(task); 6924 break; 6925 case -NFS4ERR_OLD_STATEID: 6926 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6927 calldata->lsp)) 6928 rpc_restart_call_prepare(task); 6929 break; 6930 default: 6931 task->tk_status = nfs4_async_handle_exception(task, 6932 calldata->server, task->tk_status, 6933 &exception); 6934 if (exception.retry) 6935 rpc_restart_call_prepare(task); 6936 } 6937 nfs_release_seqid(calldata->arg.seqid); 6938 } 6939 6940 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6941 { 6942 struct nfs4_unlockdata *calldata = data; 6943 6944 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6945 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6946 return; 6947 6948 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6949 goto out_wait; 6950 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6951 /* Note: exit _without_ running nfs4_locku_done */ 6952 goto out_no_action; 6953 } 6954 calldata->timestamp = jiffies; 6955 if (nfs4_setup_sequence(calldata->server->nfs_client, 6956 &calldata->arg.seq_args, 6957 &calldata->res.seq_res, 6958 task) != 0) 6959 nfs_release_seqid(calldata->arg.seqid); 6960 return; 6961 out_no_action: 6962 task->tk_action = NULL; 6963 out_wait: 6964 nfs4_sequence_done(task, &calldata->res.seq_res); 6965 } 6966 6967 static const struct rpc_call_ops nfs4_locku_ops = { 6968 .rpc_call_prepare = nfs4_locku_prepare, 6969 .rpc_call_done = nfs4_locku_done, 6970 .rpc_release = nfs4_locku_release_calldata, 6971 }; 6972 6973 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6974 struct nfs_open_context *ctx, 6975 struct nfs4_lock_state *lsp, 6976 struct nfs_seqid *seqid) 6977 { 6978 struct nfs4_unlockdata *data; 6979 struct rpc_message msg = { 6980 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6981 .rpc_cred = ctx->cred, 6982 }; 6983 struct rpc_task_setup task_setup_data = { 6984 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6985 .rpc_message = &msg, 6986 .callback_ops = &nfs4_locku_ops, 6987 .workqueue = nfsiod_workqueue, 6988 .flags = RPC_TASK_ASYNC, 6989 }; 6990 6991 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6992 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6993 6994 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6995 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6996 6997 /* Ensure this is an unlock - when canceling a lock, the 6998 * canceled lock is passed in, and it won't be an unlock. 6999 */ 7000 fl->fl_type = F_UNLCK; 7001 if (fl->fl_flags & FL_CLOSE) 7002 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 7003 7004 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7005 if (data == NULL) { 7006 nfs_free_seqid(seqid); 7007 return ERR_PTR(-ENOMEM); 7008 } 7009 7010 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7011 msg.rpc_argp = &data->arg; 7012 msg.rpc_resp = &data->res; 7013 task_setup_data.callback_data = data; 7014 return rpc_run_task(&task_setup_data); 7015 } 7016 7017 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7018 { 7019 struct inode *inode = state->inode; 7020 struct nfs4_state_owner *sp = state->owner; 7021 struct nfs_inode *nfsi = NFS_I(inode); 7022 struct nfs_seqid *seqid; 7023 struct nfs4_lock_state *lsp; 7024 struct rpc_task *task; 7025 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7026 int status = 0; 7027 unsigned char fl_flags = request->fl_flags; 7028 7029 status = nfs4_set_lock_state(state, request); 7030 /* Unlock _before_ we do the RPC call */ 7031 request->fl_flags |= FL_EXISTS; 7032 /* Exclude nfs_delegation_claim_locks() */ 7033 mutex_lock(&sp->so_delegreturn_mutex); 7034 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7035 down_read(&nfsi->rwsem); 7036 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7037 up_read(&nfsi->rwsem); 7038 mutex_unlock(&sp->so_delegreturn_mutex); 7039 goto out; 7040 } 7041 lsp = request->fl_u.nfs4_fl.owner; 7042 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7043 up_read(&nfsi->rwsem); 7044 mutex_unlock(&sp->so_delegreturn_mutex); 7045 if (status != 0) 7046 goto out; 7047 /* Is this a delegated lock? */ 7048 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7049 goto out; 7050 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7051 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7052 status = -ENOMEM; 7053 if (IS_ERR(seqid)) 7054 goto out; 7055 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7056 status = PTR_ERR(task); 7057 if (IS_ERR(task)) 7058 goto out; 7059 status = rpc_wait_for_completion_task(task); 7060 rpc_put_task(task); 7061 out: 7062 request->fl_flags = fl_flags; 7063 trace_nfs4_unlock(request, state, F_SETLK, status); 7064 return status; 7065 } 7066 7067 struct nfs4_lockdata { 7068 struct nfs_lock_args arg; 7069 struct nfs_lock_res res; 7070 struct nfs4_lock_state *lsp; 7071 struct nfs_open_context *ctx; 7072 struct file_lock fl; 7073 unsigned long timestamp; 7074 int rpc_status; 7075 int cancelled; 7076 struct nfs_server *server; 7077 }; 7078 7079 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7080 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7081 gfp_t gfp_mask) 7082 { 7083 struct nfs4_lockdata *p; 7084 struct inode *inode = lsp->ls_state->inode; 7085 struct nfs_server *server = NFS_SERVER(inode); 7086 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7087 7088 p = kzalloc(sizeof(*p), gfp_mask); 7089 if (p == NULL) 7090 return NULL; 7091 7092 p->arg.fh = NFS_FH(inode); 7093 p->arg.fl = &p->fl; 7094 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7095 if (IS_ERR(p->arg.open_seqid)) 7096 goto out_free; 7097 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7098 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7099 if (IS_ERR(p->arg.lock_seqid)) 7100 goto out_free_seqid; 7101 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7102 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7103 p->arg.lock_owner.s_dev = server->s_dev; 7104 p->res.lock_seqid = p->arg.lock_seqid; 7105 p->lsp = lsp; 7106 p->server = server; 7107 p->ctx = get_nfs_open_context(ctx); 7108 locks_init_lock(&p->fl); 7109 locks_copy_lock(&p->fl, fl); 7110 return p; 7111 out_free_seqid: 7112 nfs_free_seqid(p->arg.open_seqid); 7113 out_free: 7114 kfree(p); 7115 return NULL; 7116 } 7117 7118 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7119 { 7120 struct nfs4_lockdata *data = calldata; 7121 struct nfs4_state *state = data->lsp->ls_state; 7122 7123 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7124 goto out_wait; 7125 /* Do we need to do an open_to_lock_owner? */ 7126 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7127 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7128 goto out_release_lock_seqid; 7129 } 7130 nfs4_stateid_copy(&data->arg.open_stateid, 7131 &state->open_stateid); 7132 data->arg.new_lock_owner = 1; 7133 data->res.open_seqid = data->arg.open_seqid; 7134 } else { 7135 data->arg.new_lock_owner = 0; 7136 nfs4_stateid_copy(&data->arg.lock_stateid, 7137 &data->lsp->ls_stateid); 7138 } 7139 if (!nfs4_valid_open_stateid(state)) { 7140 data->rpc_status = -EBADF; 7141 task->tk_action = NULL; 7142 goto out_release_open_seqid; 7143 } 7144 data->timestamp = jiffies; 7145 if (nfs4_setup_sequence(data->server->nfs_client, 7146 &data->arg.seq_args, 7147 &data->res.seq_res, 7148 task) == 0) 7149 return; 7150 out_release_open_seqid: 7151 nfs_release_seqid(data->arg.open_seqid); 7152 out_release_lock_seqid: 7153 nfs_release_seqid(data->arg.lock_seqid); 7154 out_wait: 7155 nfs4_sequence_done(task, &data->res.seq_res); 7156 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7157 } 7158 7159 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7160 { 7161 struct nfs4_lockdata *data = calldata; 7162 struct nfs4_lock_state *lsp = data->lsp; 7163 7164 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7165 return; 7166 7167 data->rpc_status = task->tk_status; 7168 switch (task->tk_status) { 7169 case 0: 7170 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7171 data->timestamp); 7172 if (data->arg.new_lock && !data->cancelled) { 7173 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7174 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7175 goto out_restart; 7176 } 7177 if (data->arg.new_lock_owner != 0) { 7178 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7179 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7180 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7181 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7182 goto out_restart; 7183 break; 7184 case -NFS4ERR_BAD_STATEID: 7185 case -NFS4ERR_OLD_STATEID: 7186 case -NFS4ERR_STALE_STATEID: 7187 case -NFS4ERR_EXPIRED: 7188 if (data->arg.new_lock_owner != 0) { 7189 if (!nfs4_stateid_match(&data->arg.open_stateid, 7190 &lsp->ls_state->open_stateid)) 7191 goto out_restart; 7192 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7193 &lsp->ls_stateid)) 7194 goto out_restart; 7195 } 7196 out_done: 7197 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7198 return; 7199 out_restart: 7200 if (!data->cancelled) 7201 rpc_restart_call_prepare(task); 7202 goto out_done; 7203 } 7204 7205 static void nfs4_lock_release(void *calldata) 7206 { 7207 struct nfs4_lockdata *data = calldata; 7208 7209 nfs_free_seqid(data->arg.open_seqid); 7210 if (data->cancelled && data->rpc_status == 0) { 7211 struct rpc_task *task; 7212 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7213 data->arg.lock_seqid); 7214 if (!IS_ERR(task)) 7215 rpc_put_task_async(task); 7216 dprintk("%s: cancelling lock!\n", __func__); 7217 } else 7218 nfs_free_seqid(data->arg.lock_seqid); 7219 nfs4_put_lock_state(data->lsp); 7220 put_nfs_open_context(data->ctx); 7221 kfree(data); 7222 } 7223 7224 static const struct rpc_call_ops nfs4_lock_ops = { 7225 .rpc_call_prepare = nfs4_lock_prepare, 7226 .rpc_call_done = nfs4_lock_done, 7227 .rpc_release = nfs4_lock_release, 7228 }; 7229 7230 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7231 { 7232 switch (error) { 7233 case -NFS4ERR_ADMIN_REVOKED: 7234 case -NFS4ERR_EXPIRED: 7235 case -NFS4ERR_BAD_STATEID: 7236 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7237 if (new_lock_owner != 0 || 7238 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7239 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7240 break; 7241 case -NFS4ERR_STALE_STATEID: 7242 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7243 nfs4_schedule_lease_recovery(server->nfs_client); 7244 } 7245 } 7246 7247 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7248 { 7249 struct nfs4_lockdata *data; 7250 struct rpc_task *task; 7251 struct rpc_message msg = { 7252 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7253 .rpc_cred = state->owner->so_cred, 7254 }; 7255 struct rpc_task_setup task_setup_data = { 7256 .rpc_client = NFS_CLIENT(state->inode), 7257 .rpc_message = &msg, 7258 .callback_ops = &nfs4_lock_ops, 7259 .workqueue = nfsiod_workqueue, 7260 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7261 }; 7262 int ret; 7263 7264 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7265 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7266 7267 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7268 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7269 if (data == NULL) 7270 return -ENOMEM; 7271 if (IS_SETLKW(cmd)) 7272 data->arg.block = 1; 7273 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7274 recovery_type > NFS_LOCK_NEW); 7275 msg.rpc_argp = &data->arg; 7276 msg.rpc_resp = &data->res; 7277 task_setup_data.callback_data = data; 7278 if (recovery_type > NFS_LOCK_NEW) { 7279 if (recovery_type == NFS_LOCK_RECLAIM) 7280 data->arg.reclaim = NFS_LOCK_RECLAIM; 7281 } else 7282 data->arg.new_lock = 1; 7283 task = rpc_run_task(&task_setup_data); 7284 if (IS_ERR(task)) 7285 return PTR_ERR(task); 7286 ret = rpc_wait_for_completion_task(task); 7287 if (ret == 0) { 7288 ret = data->rpc_status; 7289 if (ret) 7290 nfs4_handle_setlk_error(data->server, data->lsp, 7291 data->arg.new_lock_owner, ret); 7292 } else 7293 data->cancelled = true; 7294 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7295 rpc_put_task(task); 7296 dprintk("%s: ret = %d\n", __func__, ret); 7297 return ret; 7298 } 7299 7300 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7301 { 7302 struct nfs_server *server = NFS_SERVER(state->inode); 7303 struct nfs4_exception exception = { 7304 .inode = state->inode, 7305 }; 7306 int err; 7307 7308 do { 7309 /* Cache the lock if possible... */ 7310 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7311 return 0; 7312 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7313 if (err != -NFS4ERR_DELAY) 7314 break; 7315 nfs4_handle_exception(server, err, &exception); 7316 } while (exception.retry); 7317 return err; 7318 } 7319 7320 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7321 { 7322 struct nfs_server *server = NFS_SERVER(state->inode); 7323 struct nfs4_exception exception = { 7324 .inode = state->inode, 7325 }; 7326 int err; 7327 7328 err = nfs4_set_lock_state(state, request); 7329 if (err != 0) 7330 return err; 7331 if (!recover_lost_locks) { 7332 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7333 return 0; 7334 } 7335 do { 7336 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7337 return 0; 7338 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7339 switch (err) { 7340 default: 7341 goto out; 7342 case -NFS4ERR_GRACE: 7343 case -NFS4ERR_DELAY: 7344 nfs4_handle_exception(server, err, &exception); 7345 err = 0; 7346 } 7347 } while (exception.retry); 7348 out: 7349 return err; 7350 } 7351 7352 #if defined(CONFIG_NFS_V4_1) 7353 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7354 { 7355 struct nfs4_lock_state *lsp; 7356 int status; 7357 7358 status = nfs4_set_lock_state(state, request); 7359 if (status != 0) 7360 return status; 7361 lsp = request->fl_u.nfs4_fl.owner; 7362 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7363 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7364 return 0; 7365 return nfs4_lock_expired(state, request); 7366 } 7367 #endif 7368 7369 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7370 { 7371 struct nfs_inode *nfsi = NFS_I(state->inode); 7372 struct nfs4_state_owner *sp = state->owner; 7373 unsigned char fl_flags = request->fl_flags; 7374 int status; 7375 7376 request->fl_flags |= FL_ACCESS; 7377 status = locks_lock_inode_wait(state->inode, request); 7378 if (status < 0) 7379 goto out; 7380 mutex_lock(&sp->so_delegreturn_mutex); 7381 down_read(&nfsi->rwsem); 7382 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7383 /* Yes: cache locks! */ 7384 /* ...but avoid races with delegation recall... */ 7385 request->fl_flags = fl_flags & ~FL_SLEEP; 7386 status = locks_lock_inode_wait(state->inode, request); 7387 up_read(&nfsi->rwsem); 7388 mutex_unlock(&sp->so_delegreturn_mutex); 7389 goto out; 7390 } 7391 up_read(&nfsi->rwsem); 7392 mutex_unlock(&sp->so_delegreturn_mutex); 7393 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7394 out: 7395 request->fl_flags = fl_flags; 7396 return status; 7397 } 7398 7399 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7400 { 7401 struct nfs4_exception exception = { 7402 .state = state, 7403 .inode = state->inode, 7404 .interruptible = true, 7405 }; 7406 int err; 7407 7408 do { 7409 err = _nfs4_proc_setlk(state, cmd, request); 7410 if (err == -NFS4ERR_DENIED) 7411 err = -EAGAIN; 7412 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7413 err, &exception); 7414 } while (exception.retry); 7415 return err; 7416 } 7417 7418 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7419 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7420 7421 static int 7422 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7423 struct file_lock *request) 7424 { 7425 int status = -ERESTARTSYS; 7426 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7427 7428 while(!signalled()) { 7429 status = nfs4_proc_setlk(state, cmd, request); 7430 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7431 break; 7432 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7433 schedule_timeout(timeout); 7434 timeout *= 2; 7435 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7436 status = -ERESTARTSYS; 7437 } 7438 return status; 7439 } 7440 7441 #ifdef CONFIG_NFS_V4_1 7442 struct nfs4_lock_waiter { 7443 struct inode *inode; 7444 struct nfs_lowner owner; 7445 wait_queue_entry_t wait; 7446 }; 7447 7448 static int 7449 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7450 { 7451 struct nfs4_lock_waiter *waiter = 7452 container_of(wait, struct nfs4_lock_waiter, wait); 7453 7454 /* NULL key means to wake up everyone */ 7455 if (key) { 7456 struct cb_notify_lock_args *cbnl = key; 7457 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7458 *wowner = &waiter->owner; 7459 7460 /* Only wake if the callback was for the same owner. */ 7461 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7462 return 0; 7463 7464 /* Make sure it's for the right inode */ 7465 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7466 return 0; 7467 } 7468 7469 return woken_wake_function(wait, mode, flags, key); 7470 } 7471 7472 static int 7473 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7474 { 7475 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7476 struct nfs_server *server = NFS_SERVER(state->inode); 7477 struct nfs_client *clp = server->nfs_client; 7478 wait_queue_head_t *q = &clp->cl_lock_waitq; 7479 struct nfs4_lock_waiter waiter = { 7480 .inode = state->inode, 7481 .owner = { .clientid = clp->cl_clientid, 7482 .id = lsp->ls_seqid.owner_id, 7483 .s_dev = server->s_dev }, 7484 }; 7485 int status; 7486 7487 /* Don't bother with waitqueue if we don't expect a callback */ 7488 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7489 return nfs4_retry_setlk_simple(state, cmd, request); 7490 7491 init_wait(&waiter.wait); 7492 waiter.wait.func = nfs4_wake_lock_waiter; 7493 add_wait_queue(q, &waiter.wait); 7494 7495 do { 7496 status = nfs4_proc_setlk(state, cmd, request); 7497 if (status != -EAGAIN || IS_SETLK(cmd)) 7498 break; 7499 7500 status = -ERESTARTSYS; 7501 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7502 NFS4_LOCK_MAXTIMEOUT); 7503 } while (!signalled()); 7504 7505 remove_wait_queue(q, &waiter.wait); 7506 7507 return status; 7508 } 7509 #else /* !CONFIG_NFS_V4_1 */ 7510 static inline int 7511 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7512 { 7513 return nfs4_retry_setlk_simple(state, cmd, request); 7514 } 7515 #endif 7516 7517 static int 7518 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7519 { 7520 struct nfs_open_context *ctx; 7521 struct nfs4_state *state; 7522 int status; 7523 7524 /* verify open state */ 7525 ctx = nfs_file_open_context(filp); 7526 state = ctx->state; 7527 7528 if (IS_GETLK(cmd)) { 7529 if (state != NULL) 7530 return nfs4_proc_getlk(state, F_GETLK, request); 7531 return 0; 7532 } 7533 7534 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7535 return -EINVAL; 7536 7537 if (request->fl_type == F_UNLCK) { 7538 if (state != NULL) 7539 return nfs4_proc_unlck(state, cmd, request); 7540 return 0; 7541 } 7542 7543 if (state == NULL) 7544 return -ENOLCK; 7545 7546 if ((request->fl_flags & FL_POSIX) && 7547 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7548 return -ENOLCK; 7549 7550 /* 7551 * Don't rely on the VFS having checked the file open mode, 7552 * since it won't do this for flock() locks. 7553 */ 7554 switch (request->fl_type) { 7555 case F_RDLCK: 7556 if (!(filp->f_mode & FMODE_READ)) 7557 return -EBADF; 7558 break; 7559 case F_WRLCK: 7560 if (!(filp->f_mode & FMODE_WRITE)) 7561 return -EBADF; 7562 } 7563 7564 status = nfs4_set_lock_state(state, request); 7565 if (status != 0) 7566 return status; 7567 7568 return nfs4_retry_setlk(state, cmd, request); 7569 } 7570 7571 static int nfs4_delete_lease(struct file *file, void **priv) 7572 { 7573 return generic_setlease(file, F_UNLCK, NULL, priv); 7574 } 7575 7576 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease, 7577 void **priv) 7578 { 7579 struct inode *inode = file_inode(file); 7580 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7581 int ret; 7582 7583 /* No delegation, no lease */ 7584 if (!nfs4_have_delegation(inode, type)) 7585 return -EAGAIN; 7586 ret = generic_setlease(file, arg, lease, priv); 7587 if (ret || nfs4_have_delegation(inode, type)) 7588 return ret; 7589 /* We raced with a delegation return */ 7590 nfs4_delete_lease(file, priv); 7591 return -EAGAIN; 7592 } 7593 7594 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease, 7595 void **priv) 7596 { 7597 switch (arg) { 7598 case F_RDLCK: 7599 case F_WRLCK: 7600 return nfs4_add_lease(file, arg, lease, priv); 7601 case F_UNLCK: 7602 return nfs4_delete_lease(file, priv); 7603 default: 7604 return -EINVAL; 7605 } 7606 } 7607 7608 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7609 { 7610 struct nfs_server *server = NFS_SERVER(state->inode); 7611 int err; 7612 7613 err = nfs4_set_lock_state(state, fl); 7614 if (err != 0) 7615 return err; 7616 do { 7617 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7618 if (err != -NFS4ERR_DELAY) 7619 break; 7620 ssleep(1); 7621 } while (err == -NFS4ERR_DELAY); 7622 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7623 } 7624 7625 struct nfs_release_lockowner_data { 7626 struct nfs4_lock_state *lsp; 7627 struct nfs_server *server; 7628 struct nfs_release_lockowner_args args; 7629 struct nfs_release_lockowner_res res; 7630 unsigned long timestamp; 7631 }; 7632 7633 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7634 { 7635 struct nfs_release_lockowner_data *data = calldata; 7636 struct nfs_server *server = data->server; 7637 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7638 &data->res.seq_res, task); 7639 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7640 data->timestamp = jiffies; 7641 } 7642 7643 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7644 { 7645 struct nfs_release_lockowner_data *data = calldata; 7646 struct nfs_server *server = data->server; 7647 7648 nfs40_sequence_done(task, &data->res.seq_res); 7649 7650 switch (task->tk_status) { 7651 case 0: 7652 renew_lease(server, data->timestamp); 7653 break; 7654 case -NFS4ERR_STALE_CLIENTID: 7655 case -NFS4ERR_EXPIRED: 7656 nfs4_schedule_lease_recovery(server->nfs_client); 7657 break; 7658 case -NFS4ERR_LEASE_MOVED: 7659 case -NFS4ERR_DELAY: 7660 if (nfs4_async_handle_error(task, server, 7661 NULL, NULL) == -EAGAIN) 7662 rpc_restart_call_prepare(task); 7663 } 7664 } 7665 7666 static void nfs4_release_lockowner_release(void *calldata) 7667 { 7668 struct nfs_release_lockowner_data *data = calldata; 7669 nfs4_free_lock_state(data->server, data->lsp); 7670 kfree(calldata); 7671 } 7672 7673 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7674 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7675 .rpc_call_done = nfs4_release_lockowner_done, 7676 .rpc_release = nfs4_release_lockowner_release, 7677 }; 7678 7679 static void 7680 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7681 { 7682 struct nfs_release_lockowner_data *data; 7683 struct rpc_message msg = { 7684 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7685 }; 7686 7687 if (server->nfs_client->cl_mvops->minor_version != 0) 7688 return; 7689 7690 data = kmalloc(sizeof(*data), GFP_KERNEL); 7691 if (!data) 7692 return; 7693 data->lsp = lsp; 7694 data->server = server; 7695 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7696 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7697 data->args.lock_owner.s_dev = server->s_dev; 7698 7699 msg.rpc_argp = &data->args; 7700 msg.rpc_resp = &data->res; 7701 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7702 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7703 } 7704 7705 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7706 7707 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7708 struct mnt_idmap *idmap, 7709 struct dentry *unused, struct inode *inode, 7710 const char *key, const void *buf, 7711 size_t buflen, int flags) 7712 { 7713 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7714 } 7715 7716 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7717 struct dentry *unused, struct inode *inode, 7718 const char *key, void *buf, size_t buflen) 7719 { 7720 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7721 } 7722 7723 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7724 { 7725 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7726 } 7727 7728 #if defined(CONFIG_NFS_V4_1) 7729 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7730 7731 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7732 struct mnt_idmap *idmap, 7733 struct dentry *unused, struct inode *inode, 7734 const char *key, const void *buf, 7735 size_t buflen, int flags) 7736 { 7737 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7738 } 7739 7740 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7741 struct dentry *unused, struct inode *inode, 7742 const char *key, void *buf, size_t buflen) 7743 { 7744 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7745 } 7746 7747 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7748 { 7749 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7750 } 7751 7752 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7753 7754 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7755 struct mnt_idmap *idmap, 7756 struct dentry *unused, struct inode *inode, 7757 const char *key, const void *buf, 7758 size_t buflen, int flags) 7759 { 7760 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7761 } 7762 7763 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7764 struct dentry *unused, struct inode *inode, 7765 const char *key, void *buf, size_t buflen) 7766 { 7767 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7768 } 7769 7770 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7771 { 7772 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7773 } 7774 7775 #endif 7776 7777 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7778 7779 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7780 struct mnt_idmap *idmap, 7781 struct dentry *unused, struct inode *inode, 7782 const char *key, const void *buf, 7783 size_t buflen, int flags) 7784 { 7785 if (security_ismaclabel(key)) 7786 return nfs4_set_security_label(inode, buf, buflen); 7787 7788 return -EOPNOTSUPP; 7789 } 7790 7791 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7792 struct dentry *unused, struct inode *inode, 7793 const char *key, void *buf, size_t buflen) 7794 { 7795 if (security_ismaclabel(key)) 7796 return nfs4_get_security_label(inode, buf, buflen); 7797 return -EOPNOTSUPP; 7798 } 7799 7800 static ssize_t 7801 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7802 { 7803 int len = 0; 7804 7805 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7806 len = security_inode_listsecurity(inode, list, list_len); 7807 if (len >= 0 && list_len && len > list_len) 7808 return -ERANGE; 7809 } 7810 return len; 7811 } 7812 7813 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7814 .prefix = XATTR_SECURITY_PREFIX, 7815 .get = nfs4_xattr_get_nfs4_label, 7816 .set = nfs4_xattr_set_nfs4_label, 7817 }; 7818 7819 #else 7820 7821 static ssize_t 7822 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7823 { 7824 return 0; 7825 } 7826 7827 #endif 7828 7829 #ifdef CONFIG_NFS_V4_2 7830 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7831 struct mnt_idmap *idmap, 7832 struct dentry *unused, struct inode *inode, 7833 const char *key, const void *buf, 7834 size_t buflen, int flags) 7835 { 7836 u32 mask; 7837 int ret; 7838 7839 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7840 return -EOPNOTSUPP; 7841 7842 /* 7843 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7844 * flags right now. Handling of xattr operations use the normal 7845 * file read/write permissions. 7846 * 7847 * Just in case the server has other ideas (which RFC 8276 allows), 7848 * do a cached access check for the XA* flags to possibly avoid 7849 * doing an RPC and getting EACCES back. 7850 */ 7851 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7852 if (!(mask & NFS_ACCESS_XAWRITE)) 7853 return -EACCES; 7854 } 7855 7856 if (buf == NULL) { 7857 ret = nfs42_proc_removexattr(inode, key); 7858 if (!ret) 7859 nfs4_xattr_cache_remove(inode, key); 7860 } else { 7861 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7862 if (!ret) 7863 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7864 } 7865 7866 return ret; 7867 } 7868 7869 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7870 struct dentry *unused, struct inode *inode, 7871 const char *key, void *buf, size_t buflen) 7872 { 7873 u32 mask; 7874 ssize_t ret; 7875 7876 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7877 return -EOPNOTSUPP; 7878 7879 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7880 if (!(mask & NFS_ACCESS_XAREAD)) 7881 return -EACCES; 7882 } 7883 7884 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7885 if (ret) 7886 return ret; 7887 7888 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7889 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7890 return ret; 7891 7892 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7893 7894 return ret; 7895 } 7896 7897 static ssize_t 7898 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7899 { 7900 u64 cookie; 7901 bool eof; 7902 ssize_t ret, size; 7903 char *buf; 7904 size_t buflen; 7905 u32 mask; 7906 7907 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7908 return 0; 7909 7910 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7911 if (!(mask & NFS_ACCESS_XALIST)) 7912 return 0; 7913 } 7914 7915 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7916 if (ret) 7917 return ret; 7918 7919 ret = nfs4_xattr_cache_list(inode, list, list_len); 7920 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7921 return ret; 7922 7923 cookie = 0; 7924 eof = false; 7925 buflen = list_len ? list_len : XATTR_LIST_MAX; 7926 buf = list_len ? list : NULL; 7927 size = 0; 7928 7929 while (!eof) { 7930 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7931 &cookie, &eof); 7932 if (ret < 0) 7933 return ret; 7934 7935 if (list_len) { 7936 buf += ret; 7937 buflen -= ret; 7938 } 7939 size += ret; 7940 } 7941 7942 if (list_len) 7943 nfs4_xattr_cache_set_list(inode, list, size); 7944 7945 return size; 7946 } 7947 7948 #else 7949 7950 static ssize_t 7951 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7952 { 7953 return 0; 7954 } 7955 #endif /* CONFIG_NFS_V4_2 */ 7956 7957 /* 7958 * nfs_fhget will use either the mounted_on_fileid or the fileid 7959 */ 7960 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7961 { 7962 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7963 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7964 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7965 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7966 return; 7967 7968 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7969 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7970 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7971 fattr->nlink = 2; 7972 } 7973 7974 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7975 const struct qstr *name, 7976 struct nfs4_fs_locations *fs_locations, 7977 struct page *page) 7978 { 7979 struct nfs_server *server = NFS_SERVER(dir); 7980 u32 bitmask[3]; 7981 struct nfs4_fs_locations_arg args = { 7982 .dir_fh = NFS_FH(dir), 7983 .name = name, 7984 .page = page, 7985 .bitmask = bitmask, 7986 }; 7987 struct nfs4_fs_locations_res res = { 7988 .fs_locations = fs_locations, 7989 }; 7990 struct rpc_message msg = { 7991 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7992 .rpc_argp = &args, 7993 .rpc_resp = &res, 7994 }; 7995 int status; 7996 7997 dprintk("%s: start\n", __func__); 7998 7999 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8000 bitmask[1] = nfs4_fattr_bitmap[1]; 8001 8002 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8003 * is not supported */ 8004 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8005 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8006 else 8007 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8008 8009 nfs_fattr_init(fs_locations->fattr); 8010 fs_locations->server = server; 8011 fs_locations->nlocations = 0; 8012 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8013 dprintk("%s: returned status = %d\n", __func__, status); 8014 return status; 8015 } 8016 8017 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8018 const struct qstr *name, 8019 struct nfs4_fs_locations *fs_locations, 8020 struct page *page) 8021 { 8022 struct nfs4_exception exception = { 8023 .interruptible = true, 8024 }; 8025 int err; 8026 do { 8027 err = _nfs4_proc_fs_locations(client, dir, name, 8028 fs_locations, page); 8029 trace_nfs4_get_fs_locations(dir, name, err); 8030 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8031 &exception); 8032 } while (exception.retry); 8033 return err; 8034 } 8035 8036 /* 8037 * This operation also signals the server that this client is 8038 * performing migration recovery. The server can stop returning 8039 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8040 * appended to this compound to identify the client ID which is 8041 * performing recovery. 8042 */ 8043 static int _nfs40_proc_get_locations(struct nfs_server *server, 8044 struct nfs_fh *fhandle, 8045 struct nfs4_fs_locations *locations, 8046 struct page *page, const struct cred *cred) 8047 { 8048 struct rpc_clnt *clnt = server->client; 8049 u32 bitmask[2] = { 8050 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8051 }; 8052 struct nfs4_fs_locations_arg args = { 8053 .clientid = server->nfs_client->cl_clientid, 8054 .fh = fhandle, 8055 .page = page, 8056 .bitmask = bitmask, 8057 .migration = 1, /* skip LOOKUP */ 8058 .renew = 1, /* append RENEW */ 8059 }; 8060 struct nfs4_fs_locations_res res = { 8061 .fs_locations = locations, 8062 .migration = 1, 8063 .renew = 1, 8064 }; 8065 struct rpc_message msg = { 8066 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8067 .rpc_argp = &args, 8068 .rpc_resp = &res, 8069 .rpc_cred = cred, 8070 }; 8071 unsigned long now = jiffies; 8072 int status; 8073 8074 nfs_fattr_init(locations->fattr); 8075 locations->server = server; 8076 locations->nlocations = 0; 8077 8078 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8079 status = nfs4_call_sync_sequence(clnt, server, &msg, 8080 &args.seq_args, &res.seq_res); 8081 if (status) 8082 return status; 8083 8084 renew_lease(server, now); 8085 return 0; 8086 } 8087 8088 #ifdef CONFIG_NFS_V4_1 8089 8090 /* 8091 * This operation also signals the server that this client is 8092 * performing migration recovery. The server can stop asserting 8093 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8094 * performing this operation is identified in the SEQUENCE 8095 * operation in this compound. 8096 * 8097 * When the client supports GETATTR(fs_locations_info), it can 8098 * be plumbed in here. 8099 */ 8100 static int _nfs41_proc_get_locations(struct nfs_server *server, 8101 struct nfs_fh *fhandle, 8102 struct nfs4_fs_locations *locations, 8103 struct page *page, const struct cred *cred) 8104 { 8105 struct rpc_clnt *clnt = server->client; 8106 u32 bitmask[2] = { 8107 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8108 }; 8109 struct nfs4_fs_locations_arg args = { 8110 .fh = fhandle, 8111 .page = page, 8112 .bitmask = bitmask, 8113 .migration = 1, /* skip LOOKUP */ 8114 }; 8115 struct nfs4_fs_locations_res res = { 8116 .fs_locations = locations, 8117 .migration = 1, 8118 }; 8119 struct rpc_message msg = { 8120 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8121 .rpc_argp = &args, 8122 .rpc_resp = &res, 8123 .rpc_cred = cred, 8124 }; 8125 struct nfs4_call_sync_data data = { 8126 .seq_server = server, 8127 .seq_args = &args.seq_args, 8128 .seq_res = &res.seq_res, 8129 }; 8130 struct rpc_task_setup task_setup_data = { 8131 .rpc_client = clnt, 8132 .rpc_message = &msg, 8133 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8134 .callback_data = &data, 8135 .flags = RPC_TASK_NO_ROUND_ROBIN, 8136 }; 8137 int status; 8138 8139 nfs_fattr_init(locations->fattr); 8140 locations->server = server; 8141 locations->nlocations = 0; 8142 8143 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8144 status = nfs4_call_sync_custom(&task_setup_data); 8145 if (status == NFS4_OK && 8146 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8147 status = -NFS4ERR_LEASE_MOVED; 8148 return status; 8149 } 8150 8151 #endif /* CONFIG_NFS_V4_1 */ 8152 8153 /** 8154 * nfs4_proc_get_locations - discover locations for a migrated FSID 8155 * @server: pointer to nfs_server to process 8156 * @fhandle: pointer to the kernel NFS client file handle 8157 * @locations: result of query 8158 * @page: buffer 8159 * @cred: credential to use for this operation 8160 * 8161 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8162 * operation failed, or a negative errno if a local error occurred. 8163 * 8164 * On success, "locations" is filled in, but if the server has 8165 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8166 * asserted. 8167 * 8168 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8169 * from this client that require migration recovery. 8170 */ 8171 int nfs4_proc_get_locations(struct nfs_server *server, 8172 struct nfs_fh *fhandle, 8173 struct nfs4_fs_locations *locations, 8174 struct page *page, const struct cred *cred) 8175 { 8176 struct nfs_client *clp = server->nfs_client; 8177 const struct nfs4_mig_recovery_ops *ops = 8178 clp->cl_mvops->mig_recovery_ops; 8179 struct nfs4_exception exception = { 8180 .interruptible = true, 8181 }; 8182 int status; 8183 8184 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8185 (unsigned long long)server->fsid.major, 8186 (unsigned long long)server->fsid.minor, 8187 clp->cl_hostname); 8188 nfs_display_fhandle(fhandle, __func__); 8189 8190 do { 8191 status = ops->get_locations(server, fhandle, locations, page, 8192 cred); 8193 if (status != -NFS4ERR_DELAY) 8194 break; 8195 nfs4_handle_exception(server, status, &exception); 8196 } while (exception.retry); 8197 return status; 8198 } 8199 8200 /* 8201 * This operation also signals the server that this client is 8202 * performing "lease moved" recovery. The server can stop 8203 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8204 * is appended to this compound to identify the client ID which is 8205 * performing recovery. 8206 */ 8207 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8208 { 8209 struct nfs_server *server = NFS_SERVER(inode); 8210 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8211 struct rpc_clnt *clnt = server->client; 8212 struct nfs4_fsid_present_arg args = { 8213 .fh = NFS_FH(inode), 8214 .clientid = clp->cl_clientid, 8215 .renew = 1, /* append RENEW */ 8216 }; 8217 struct nfs4_fsid_present_res res = { 8218 .renew = 1, 8219 }; 8220 struct rpc_message msg = { 8221 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8222 .rpc_argp = &args, 8223 .rpc_resp = &res, 8224 .rpc_cred = cred, 8225 }; 8226 unsigned long now = jiffies; 8227 int status; 8228 8229 res.fh = nfs_alloc_fhandle(); 8230 if (res.fh == NULL) 8231 return -ENOMEM; 8232 8233 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8234 status = nfs4_call_sync_sequence(clnt, server, &msg, 8235 &args.seq_args, &res.seq_res); 8236 nfs_free_fhandle(res.fh); 8237 if (status) 8238 return status; 8239 8240 do_renew_lease(clp, now); 8241 return 0; 8242 } 8243 8244 #ifdef CONFIG_NFS_V4_1 8245 8246 /* 8247 * This operation also signals the server that this client is 8248 * performing "lease moved" recovery. The server can stop asserting 8249 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8250 * this operation is identified in the SEQUENCE operation in this 8251 * compound. 8252 */ 8253 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8254 { 8255 struct nfs_server *server = NFS_SERVER(inode); 8256 struct rpc_clnt *clnt = server->client; 8257 struct nfs4_fsid_present_arg args = { 8258 .fh = NFS_FH(inode), 8259 }; 8260 struct nfs4_fsid_present_res res = { 8261 }; 8262 struct rpc_message msg = { 8263 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8264 .rpc_argp = &args, 8265 .rpc_resp = &res, 8266 .rpc_cred = cred, 8267 }; 8268 int status; 8269 8270 res.fh = nfs_alloc_fhandle(); 8271 if (res.fh == NULL) 8272 return -ENOMEM; 8273 8274 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8275 status = nfs4_call_sync_sequence(clnt, server, &msg, 8276 &args.seq_args, &res.seq_res); 8277 nfs_free_fhandle(res.fh); 8278 if (status == NFS4_OK && 8279 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8280 status = -NFS4ERR_LEASE_MOVED; 8281 return status; 8282 } 8283 8284 #endif /* CONFIG_NFS_V4_1 */ 8285 8286 /** 8287 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8288 * @inode: inode on FSID to check 8289 * @cred: credential to use for this operation 8290 * 8291 * Server indicates whether the FSID is present, moved, or not 8292 * recognized. This operation is necessary to clear a LEASE_MOVED 8293 * condition for this client ID. 8294 * 8295 * Returns NFS4_OK if the FSID is present on this server, 8296 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8297 * NFS4ERR code if some error occurred on the server, or a 8298 * negative errno if a local failure occurred. 8299 */ 8300 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8301 { 8302 struct nfs_server *server = NFS_SERVER(inode); 8303 struct nfs_client *clp = server->nfs_client; 8304 const struct nfs4_mig_recovery_ops *ops = 8305 clp->cl_mvops->mig_recovery_ops; 8306 struct nfs4_exception exception = { 8307 .interruptible = true, 8308 }; 8309 int status; 8310 8311 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8312 (unsigned long long)server->fsid.major, 8313 (unsigned long long)server->fsid.minor, 8314 clp->cl_hostname); 8315 nfs_display_fhandle(NFS_FH(inode), __func__); 8316 8317 do { 8318 status = ops->fsid_present(inode, cred); 8319 if (status != -NFS4ERR_DELAY) 8320 break; 8321 nfs4_handle_exception(server, status, &exception); 8322 } while (exception.retry); 8323 return status; 8324 } 8325 8326 /* 8327 * If 'use_integrity' is true and the state managment nfs_client 8328 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8329 * and the machine credential as per RFC3530bis and RFC5661 Security 8330 * Considerations sections. Otherwise, just use the user cred with the 8331 * filesystem's rpc_client. 8332 */ 8333 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8334 { 8335 int status; 8336 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8337 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8338 struct nfs4_secinfo_arg args = { 8339 .dir_fh = NFS_FH(dir), 8340 .name = name, 8341 }; 8342 struct nfs4_secinfo_res res = { 8343 .flavors = flavors, 8344 }; 8345 struct rpc_message msg = { 8346 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8347 .rpc_argp = &args, 8348 .rpc_resp = &res, 8349 }; 8350 struct nfs4_call_sync_data data = { 8351 .seq_server = NFS_SERVER(dir), 8352 .seq_args = &args.seq_args, 8353 .seq_res = &res.seq_res, 8354 }; 8355 struct rpc_task_setup task_setup = { 8356 .rpc_client = clnt, 8357 .rpc_message = &msg, 8358 .callback_ops = clp->cl_mvops->call_sync_ops, 8359 .callback_data = &data, 8360 .flags = RPC_TASK_NO_ROUND_ROBIN, 8361 }; 8362 const struct cred *cred = NULL; 8363 8364 if (use_integrity) { 8365 clnt = clp->cl_rpcclient; 8366 task_setup.rpc_client = clnt; 8367 8368 cred = nfs4_get_clid_cred(clp); 8369 msg.rpc_cred = cred; 8370 } 8371 8372 dprintk("NFS call secinfo %s\n", name->name); 8373 8374 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8375 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8376 status = nfs4_call_sync_custom(&task_setup); 8377 8378 dprintk("NFS reply secinfo: %d\n", status); 8379 8380 put_cred(cred); 8381 return status; 8382 } 8383 8384 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8385 struct nfs4_secinfo_flavors *flavors) 8386 { 8387 struct nfs4_exception exception = { 8388 .interruptible = true, 8389 }; 8390 int err; 8391 do { 8392 err = -NFS4ERR_WRONGSEC; 8393 8394 /* try to use integrity protection with machine cred */ 8395 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8396 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8397 8398 /* 8399 * if unable to use integrity protection, or SECINFO with 8400 * integrity protection returns NFS4ERR_WRONGSEC (which is 8401 * disallowed by spec, but exists in deployed servers) use 8402 * the current filesystem's rpc_client and the user cred. 8403 */ 8404 if (err == -NFS4ERR_WRONGSEC) 8405 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8406 8407 trace_nfs4_secinfo(dir, name, err); 8408 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8409 &exception); 8410 } while (exception.retry); 8411 return err; 8412 } 8413 8414 #ifdef CONFIG_NFS_V4_1 8415 /* 8416 * Check the exchange flags returned by the server for invalid flags, having 8417 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8418 * DS flags set. 8419 */ 8420 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8421 { 8422 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8423 goto out_inval; 8424 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8425 goto out_inval; 8426 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8427 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8428 goto out_inval; 8429 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8430 goto out_inval; 8431 return NFS_OK; 8432 out_inval: 8433 return -NFS4ERR_INVAL; 8434 } 8435 8436 static bool 8437 nfs41_same_server_scope(struct nfs41_server_scope *a, 8438 struct nfs41_server_scope *b) 8439 { 8440 if (a->server_scope_sz != b->server_scope_sz) 8441 return false; 8442 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8443 } 8444 8445 static void 8446 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8447 { 8448 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8449 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8450 struct nfs_client *clp = args->client; 8451 8452 switch (task->tk_status) { 8453 case -NFS4ERR_BADSESSION: 8454 case -NFS4ERR_DEADSESSION: 8455 nfs4_schedule_session_recovery(clp->cl_session, 8456 task->tk_status); 8457 return; 8458 } 8459 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8460 res->dir != NFS4_CDFS4_BOTH) { 8461 rpc_task_close_connection(task); 8462 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8463 rpc_restart_call(task); 8464 } 8465 } 8466 8467 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8468 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8469 }; 8470 8471 /* 8472 * nfs4_proc_bind_one_conn_to_session() 8473 * 8474 * The 4.1 client currently uses the same TCP connection for the 8475 * fore and backchannel. 8476 */ 8477 static 8478 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8479 struct rpc_xprt *xprt, 8480 struct nfs_client *clp, 8481 const struct cred *cred) 8482 { 8483 int status; 8484 struct nfs41_bind_conn_to_session_args args = { 8485 .client = clp, 8486 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8487 .retries = 0, 8488 }; 8489 struct nfs41_bind_conn_to_session_res res; 8490 struct rpc_message msg = { 8491 .rpc_proc = 8492 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8493 .rpc_argp = &args, 8494 .rpc_resp = &res, 8495 .rpc_cred = cred, 8496 }; 8497 struct rpc_task_setup task_setup_data = { 8498 .rpc_client = clnt, 8499 .rpc_xprt = xprt, 8500 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8501 .rpc_message = &msg, 8502 .flags = RPC_TASK_TIMEOUT, 8503 }; 8504 struct rpc_task *task; 8505 8506 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8507 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8508 args.dir = NFS4_CDFC4_FORE; 8509 8510 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8511 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8512 args.dir = NFS4_CDFC4_FORE; 8513 8514 task = rpc_run_task(&task_setup_data); 8515 if (!IS_ERR(task)) { 8516 status = task->tk_status; 8517 rpc_put_task(task); 8518 } else 8519 status = PTR_ERR(task); 8520 trace_nfs4_bind_conn_to_session(clp, status); 8521 if (status == 0) { 8522 if (memcmp(res.sessionid.data, 8523 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8524 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8525 return -EIO; 8526 } 8527 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8528 dprintk("NFS: %s: Unexpected direction from server\n", 8529 __func__); 8530 return -EIO; 8531 } 8532 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8533 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8534 __func__); 8535 return -EIO; 8536 } 8537 } 8538 8539 return status; 8540 } 8541 8542 struct rpc_bind_conn_calldata { 8543 struct nfs_client *clp; 8544 const struct cred *cred; 8545 }; 8546 8547 static int 8548 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8549 struct rpc_xprt *xprt, 8550 void *calldata) 8551 { 8552 struct rpc_bind_conn_calldata *p = calldata; 8553 8554 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8555 } 8556 8557 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8558 { 8559 struct rpc_bind_conn_calldata data = { 8560 .clp = clp, 8561 .cred = cred, 8562 }; 8563 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8564 nfs4_proc_bind_conn_to_session_callback, &data); 8565 } 8566 8567 /* 8568 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8569 * and operations we'd like to see to enable certain features in the allow map 8570 */ 8571 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8572 .how = SP4_MACH_CRED, 8573 .enforce.u.words = { 8574 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8575 1 << (OP_EXCHANGE_ID - 32) | 8576 1 << (OP_CREATE_SESSION - 32) | 8577 1 << (OP_DESTROY_SESSION - 32) | 8578 1 << (OP_DESTROY_CLIENTID - 32) 8579 }, 8580 .allow.u.words = { 8581 [0] = 1 << (OP_CLOSE) | 8582 1 << (OP_OPEN_DOWNGRADE) | 8583 1 << (OP_LOCKU) | 8584 1 << (OP_DELEGRETURN) | 8585 1 << (OP_COMMIT), 8586 [1] = 1 << (OP_SECINFO - 32) | 8587 1 << (OP_SECINFO_NO_NAME - 32) | 8588 1 << (OP_LAYOUTRETURN - 32) | 8589 1 << (OP_TEST_STATEID - 32) | 8590 1 << (OP_FREE_STATEID - 32) | 8591 1 << (OP_WRITE - 32) 8592 } 8593 }; 8594 8595 /* 8596 * Select the state protection mode for client `clp' given the server results 8597 * from exchange_id in `sp'. 8598 * 8599 * Returns 0 on success, negative errno otherwise. 8600 */ 8601 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8602 struct nfs41_state_protection *sp) 8603 { 8604 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8605 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8606 1 << (OP_EXCHANGE_ID - 32) | 8607 1 << (OP_CREATE_SESSION - 32) | 8608 1 << (OP_DESTROY_SESSION - 32) | 8609 1 << (OP_DESTROY_CLIENTID - 32) 8610 }; 8611 unsigned long flags = 0; 8612 unsigned int i; 8613 int ret = 0; 8614 8615 if (sp->how == SP4_MACH_CRED) { 8616 /* Print state protect result */ 8617 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8618 for (i = 0; i <= LAST_NFS4_OP; i++) { 8619 if (test_bit(i, sp->enforce.u.longs)) 8620 dfprintk(MOUNT, " enforce op %d\n", i); 8621 if (test_bit(i, sp->allow.u.longs)) 8622 dfprintk(MOUNT, " allow op %d\n", i); 8623 } 8624 8625 /* make sure nothing is on enforce list that isn't supported */ 8626 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8627 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8628 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8629 ret = -EINVAL; 8630 goto out; 8631 } 8632 } 8633 8634 /* 8635 * Minimal mode - state operations are allowed to use machine 8636 * credential. Note this already happens by default, so the 8637 * client doesn't have to do anything more than the negotiation. 8638 * 8639 * NOTE: we don't care if EXCHANGE_ID is in the list - 8640 * we're already using the machine cred for exchange_id 8641 * and will never use a different cred. 8642 */ 8643 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8644 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8645 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8646 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8647 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8648 dfprintk(MOUNT, " minimal mode enabled\n"); 8649 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8650 } else { 8651 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8652 ret = -EINVAL; 8653 goto out; 8654 } 8655 8656 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8657 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8658 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8659 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8660 dfprintk(MOUNT, " cleanup mode enabled\n"); 8661 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8662 } 8663 8664 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8665 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8666 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8667 } 8668 8669 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8670 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8671 dfprintk(MOUNT, " secinfo mode enabled\n"); 8672 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8673 } 8674 8675 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8676 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8677 dfprintk(MOUNT, " stateid mode enabled\n"); 8678 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8679 } 8680 8681 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8682 dfprintk(MOUNT, " write mode enabled\n"); 8683 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8684 } 8685 8686 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8687 dfprintk(MOUNT, " commit mode enabled\n"); 8688 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8689 } 8690 } 8691 out: 8692 clp->cl_sp4_flags = flags; 8693 return ret; 8694 } 8695 8696 struct nfs41_exchange_id_data { 8697 struct nfs41_exchange_id_res res; 8698 struct nfs41_exchange_id_args args; 8699 }; 8700 8701 static void nfs4_exchange_id_release(void *data) 8702 { 8703 struct nfs41_exchange_id_data *cdata = 8704 (struct nfs41_exchange_id_data *)data; 8705 8706 nfs_put_client(cdata->args.client); 8707 kfree(cdata->res.impl_id); 8708 kfree(cdata->res.server_scope); 8709 kfree(cdata->res.server_owner); 8710 kfree(cdata); 8711 } 8712 8713 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8714 .rpc_release = nfs4_exchange_id_release, 8715 }; 8716 8717 /* 8718 * _nfs4_proc_exchange_id() 8719 * 8720 * Wrapper for EXCHANGE_ID operation. 8721 */ 8722 static struct rpc_task * 8723 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8724 u32 sp4_how, struct rpc_xprt *xprt) 8725 { 8726 struct rpc_message msg = { 8727 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8728 .rpc_cred = cred, 8729 }; 8730 struct rpc_task_setup task_setup_data = { 8731 .rpc_client = clp->cl_rpcclient, 8732 .callback_ops = &nfs4_exchange_id_call_ops, 8733 .rpc_message = &msg, 8734 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8735 }; 8736 struct nfs41_exchange_id_data *calldata; 8737 int status; 8738 8739 if (!refcount_inc_not_zero(&clp->cl_count)) 8740 return ERR_PTR(-EIO); 8741 8742 status = -ENOMEM; 8743 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8744 if (!calldata) 8745 goto out; 8746 8747 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8748 8749 status = nfs4_init_uniform_client_string(clp); 8750 if (status) 8751 goto out_calldata; 8752 8753 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8754 GFP_NOFS); 8755 status = -ENOMEM; 8756 if (unlikely(calldata->res.server_owner == NULL)) 8757 goto out_calldata; 8758 8759 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8760 GFP_NOFS); 8761 if (unlikely(calldata->res.server_scope == NULL)) 8762 goto out_server_owner; 8763 8764 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8765 if (unlikely(calldata->res.impl_id == NULL)) 8766 goto out_server_scope; 8767 8768 switch (sp4_how) { 8769 case SP4_NONE: 8770 calldata->args.state_protect.how = SP4_NONE; 8771 break; 8772 8773 case SP4_MACH_CRED: 8774 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8775 break; 8776 8777 default: 8778 /* unsupported! */ 8779 WARN_ON_ONCE(1); 8780 status = -EINVAL; 8781 goto out_impl_id; 8782 } 8783 if (xprt) { 8784 task_setup_data.rpc_xprt = xprt; 8785 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8786 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8787 sizeof(calldata->args.verifier.data)); 8788 } 8789 calldata->args.client = clp; 8790 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8791 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8792 #ifdef CONFIG_NFS_V4_1_MIGRATION 8793 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8794 #endif 8795 msg.rpc_argp = &calldata->args; 8796 msg.rpc_resp = &calldata->res; 8797 task_setup_data.callback_data = calldata; 8798 8799 return rpc_run_task(&task_setup_data); 8800 8801 out_impl_id: 8802 kfree(calldata->res.impl_id); 8803 out_server_scope: 8804 kfree(calldata->res.server_scope); 8805 out_server_owner: 8806 kfree(calldata->res.server_owner); 8807 out_calldata: 8808 kfree(calldata); 8809 out: 8810 nfs_put_client(clp); 8811 return ERR_PTR(status); 8812 } 8813 8814 /* 8815 * _nfs4_proc_exchange_id() 8816 * 8817 * Wrapper for EXCHANGE_ID operation. 8818 */ 8819 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8820 u32 sp4_how) 8821 { 8822 struct rpc_task *task; 8823 struct nfs41_exchange_id_args *argp; 8824 struct nfs41_exchange_id_res *resp; 8825 unsigned long now = jiffies; 8826 int status; 8827 8828 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8829 if (IS_ERR(task)) 8830 return PTR_ERR(task); 8831 8832 argp = task->tk_msg.rpc_argp; 8833 resp = task->tk_msg.rpc_resp; 8834 status = task->tk_status; 8835 if (status != 0) 8836 goto out; 8837 8838 status = nfs4_check_cl_exchange_flags(resp->flags, 8839 clp->cl_mvops->minor_version); 8840 if (status != 0) 8841 goto out; 8842 8843 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8844 if (status != 0) 8845 goto out; 8846 8847 do_renew_lease(clp, now); 8848 8849 clp->cl_clientid = resp->clientid; 8850 clp->cl_exchange_flags = resp->flags; 8851 clp->cl_seqid = resp->seqid; 8852 /* Client ID is not confirmed */ 8853 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8854 clear_bit(NFS4_SESSION_ESTABLISHED, 8855 &clp->cl_session->session_state); 8856 8857 if (clp->cl_serverscope != NULL && 8858 !nfs41_same_server_scope(clp->cl_serverscope, 8859 resp->server_scope)) { 8860 dprintk("%s: server_scope mismatch detected\n", 8861 __func__); 8862 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8863 } 8864 8865 swap(clp->cl_serverowner, resp->server_owner); 8866 swap(clp->cl_serverscope, resp->server_scope); 8867 swap(clp->cl_implid, resp->impl_id); 8868 8869 /* Save the EXCHANGE_ID verifier session trunk tests */ 8870 memcpy(clp->cl_confirm.data, argp->verifier.data, 8871 sizeof(clp->cl_confirm.data)); 8872 out: 8873 trace_nfs4_exchange_id(clp, status); 8874 rpc_put_task(task); 8875 return status; 8876 } 8877 8878 /* 8879 * nfs4_proc_exchange_id() 8880 * 8881 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8882 * 8883 * Since the clientid has expired, all compounds using sessions 8884 * associated with the stale clientid will be returning 8885 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8886 * be in some phase of session reset. 8887 * 8888 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8889 */ 8890 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8891 { 8892 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8893 int status; 8894 8895 /* try SP4_MACH_CRED if krb5i/p */ 8896 if (authflavor == RPC_AUTH_GSS_KRB5I || 8897 authflavor == RPC_AUTH_GSS_KRB5P) { 8898 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8899 if (!status) 8900 return 0; 8901 } 8902 8903 /* try SP4_NONE */ 8904 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8905 } 8906 8907 /** 8908 * nfs4_test_session_trunk 8909 * 8910 * This is an add_xprt_test() test function called from 8911 * rpc_clnt_setup_test_and_add_xprt. 8912 * 8913 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8914 * and is dereferrenced in nfs4_exchange_id_release 8915 * 8916 * Upon success, add the new transport to the rpc_clnt 8917 * 8918 * @clnt: struct rpc_clnt to get new transport 8919 * @xprt: the rpc_xprt to test 8920 * @data: call data for _nfs4_proc_exchange_id. 8921 */ 8922 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8923 void *data) 8924 { 8925 struct nfs4_add_xprt_data *adata = data; 8926 struct rpc_task *task; 8927 int status; 8928 8929 u32 sp4_how; 8930 8931 dprintk("--> %s try %s\n", __func__, 8932 xprt->address_strings[RPC_DISPLAY_ADDR]); 8933 8934 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8935 8936 /* Test connection for session trunking. Async exchange_id call */ 8937 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8938 if (IS_ERR(task)) 8939 return; 8940 8941 status = task->tk_status; 8942 if (status == 0) 8943 status = nfs4_detect_session_trunking(adata->clp, 8944 task->tk_msg.rpc_resp, xprt); 8945 8946 if (status == 0) 8947 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8948 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8949 (struct sockaddr *)&xprt->addr)) 8950 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8951 8952 rpc_put_task(task); 8953 } 8954 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8955 8956 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8957 const struct cred *cred) 8958 { 8959 struct rpc_message msg = { 8960 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8961 .rpc_argp = clp, 8962 .rpc_cred = cred, 8963 }; 8964 int status; 8965 8966 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8967 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8968 trace_nfs4_destroy_clientid(clp, status); 8969 if (status) 8970 dprintk("NFS: Got error %d from the server %s on " 8971 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8972 return status; 8973 } 8974 8975 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8976 const struct cred *cred) 8977 { 8978 unsigned int loop; 8979 int ret; 8980 8981 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8982 ret = _nfs4_proc_destroy_clientid(clp, cred); 8983 switch (ret) { 8984 case -NFS4ERR_DELAY: 8985 case -NFS4ERR_CLIENTID_BUSY: 8986 ssleep(1); 8987 break; 8988 default: 8989 return ret; 8990 } 8991 } 8992 return 0; 8993 } 8994 8995 int nfs4_destroy_clientid(struct nfs_client *clp) 8996 { 8997 const struct cred *cred; 8998 int ret = 0; 8999 9000 if (clp->cl_mvops->minor_version < 1) 9001 goto out; 9002 if (clp->cl_exchange_flags == 0) 9003 goto out; 9004 if (clp->cl_preserve_clid) 9005 goto out; 9006 cred = nfs4_get_clid_cred(clp); 9007 ret = nfs4_proc_destroy_clientid(clp, cred); 9008 put_cred(cred); 9009 switch (ret) { 9010 case 0: 9011 case -NFS4ERR_STALE_CLIENTID: 9012 clp->cl_exchange_flags = 0; 9013 } 9014 out: 9015 return ret; 9016 } 9017 9018 #endif /* CONFIG_NFS_V4_1 */ 9019 9020 struct nfs4_get_lease_time_data { 9021 struct nfs4_get_lease_time_args *args; 9022 struct nfs4_get_lease_time_res *res; 9023 struct nfs_client *clp; 9024 }; 9025 9026 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9027 void *calldata) 9028 { 9029 struct nfs4_get_lease_time_data *data = 9030 (struct nfs4_get_lease_time_data *)calldata; 9031 9032 /* just setup sequence, do not trigger session recovery 9033 since we're invoked within one */ 9034 nfs4_setup_sequence(data->clp, 9035 &data->args->la_seq_args, 9036 &data->res->lr_seq_res, 9037 task); 9038 } 9039 9040 /* 9041 * Called from nfs4_state_manager thread for session setup, so don't recover 9042 * from sequence operation or clientid errors. 9043 */ 9044 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9045 { 9046 struct nfs4_get_lease_time_data *data = 9047 (struct nfs4_get_lease_time_data *)calldata; 9048 9049 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9050 return; 9051 switch (task->tk_status) { 9052 case -NFS4ERR_DELAY: 9053 case -NFS4ERR_GRACE: 9054 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9055 task->tk_status = 0; 9056 fallthrough; 9057 case -NFS4ERR_RETRY_UNCACHED_REP: 9058 rpc_restart_call_prepare(task); 9059 return; 9060 } 9061 } 9062 9063 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9064 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9065 .rpc_call_done = nfs4_get_lease_time_done, 9066 }; 9067 9068 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9069 { 9070 struct nfs4_get_lease_time_args args; 9071 struct nfs4_get_lease_time_res res = { 9072 .lr_fsinfo = fsinfo, 9073 }; 9074 struct nfs4_get_lease_time_data data = { 9075 .args = &args, 9076 .res = &res, 9077 .clp = clp, 9078 }; 9079 struct rpc_message msg = { 9080 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9081 .rpc_argp = &args, 9082 .rpc_resp = &res, 9083 }; 9084 struct rpc_task_setup task_setup = { 9085 .rpc_client = clp->cl_rpcclient, 9086 .rpc_message = &msg, 9087 .callback_ops = &nfs4_get_lease_time_ops, 9088 .callback_data = &data, 9089 .flags = RPC_TASK_TIMEOUT, 9090 }; 9091 9092 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9093 return nfs4_call_sync_custom(&task_setup); 9094 } 9095 9096 #ifdef CONFIG_NFS_V4_1 9097 9098 /* 9099 * Initialize the values to be used by the client in CREATE_SESSION 9100 * If nfs4_init_session set the fore channel request and response sizes, 9101 * use them. 9102 * 9103 * Set the back channel max_resp_sz_cached to zero to force the client to 9104 * always set csa_cachethis to FALSE because the current implementation 9105 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9106 */ 9107 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9108 struct rpc_clnt *clnt) 9109 { 9110 unsigned int max_rqst_sz, max_resp_sz; 9111 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9112 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9113 9114 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9115 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9116 9117 /* Fore channel attributes */ 9118 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9119 args->fc_attrs.max_resp_sz = max_resp_sz; 9120 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9121 args->fc_attrs.max_reqs = max_session_slots; 9122 9123 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9124 "max_ops=%u max_reqs=%u\n", 9125 __func__, 9126 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9127 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9128 9129 /* Back channel attributes */ 9130 args->bc_attrs.max_rqst_sz = max_bc_payload; 9131 args->bc_attrs.max_resp_sz = max_bc_payload; 9132 args->bc_attrs.max_resp_sz_cached = 0; 9133 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9134 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9135 if (args->bc_attrs.max_reqs > max_bc_slots) 9136 args->bc_attrs.max_reqs = max_bc_slots; 9137 9138 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9139 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9140 __func__, 9141 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9142 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9143 args->bc_attrs.max_reqs); 9144 } 9145 9146 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9147 struct nfs41_create_session_res *res) 9148 { 9149 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9150 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9151 9152 if (rcvd->max_resp_sz > sent->max_resp_sz) 9153 return -EINVAL; 9154 /* 9155 * Our requested max_ops is the minimum we need; we're not 9156 * prepared to break up compounds into smaller pieces than that. 9157 * So, no point even trying to continue if the server won't 9158 * cooperate: 9159 */ 9160 if (rcvd->max_ops < sent->max_ops) 9161 return -EINVAL; 9162 if (rcvd->max_reqs == 0) 9163 return -EINVAL; 9164 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9165 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9166 return 0; 9167 } 9168 9169 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9170 struct nfs41_create_session_res *res) 9171 { 9172 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9173 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9174 9175 if (!(res->flags & SESSION4_BACK_CHAN)) 9176 goto out; 9177 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9178 return -EINVAL; 9179 if (rcvd->max_resp_sz < sent->max_resp_sz) 9180 return -EINVAL; 9181 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9182 return -EINVAL; 9183 if (rcvd->max_ops > sent->max_ops) 9184 return -EINVAL; 9185 if (rcvd->max_reqs > sent->max_reqs) 9186 return -EINVAL; 9187 out: 9188 return 0; 9189 } 9190 9191 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9192 struct nfs41_create_session_res *res) 9193 { 9194 int ret; 9195 9196 ret = nfs4_verify_fore_channel_attrs(args, res); 9197 if (ret) 9198 return ret; 9199 return nfs4_verify_back_channel_attrs(args, res); 9200 } 9201 9202 static void nfs4_update_session(struct nfs4_session *session, 9203 struct nfs41_create_session_res *res) 9204 { 9205 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9206 /* Mark client id and session as being confirmed */ 9207 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9208 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9209 session->flags = res->flags; 9210 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9211 if (res->flags & SESSION4_BACK_CHAN) 9212 memcpy(&session->bc_attrs, &res->bc_attrs, 9213 sizeof(session->bc_attrs)); 9214 } 9215 9216 static int _nfs4_proc_create_session(struct nfs_client *clp, 9217 const struct cred *cred) 9218 { 9219 struct nfs4_session *session = clp->cl_session; 9220 struct nfs41_create_session_args args = { 9221 .client = clp, 9222 .clientid = clp->cl_clientid, 9223 .seqid = clp->cl_seqid, 9224 .cb_program = NFS4_CALLBACK, 9225 }; 9226 struct nfs41_create_session_res res; 9227 9228 struct rpc_message msg = { 9229 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9230 .rpc_argp = &args, 9231 .rpc_resp = &res, 9232 .rpc_cred = cred, 9233 }; 9234 int status; 9235 9236 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9237 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9238 9239 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9240 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9241 trace_nfs4_create_session(clp, status); 9242 9243 switch (status) { 9244 case -NFS4ERR_STALE_CLIENTID: 9245 case -NFS4ERR_DELAY: 9246 case -ETIMEDOUT: 9247 case -EACCES: 9248 case -EAGAIN: 9249 goto out; 9250 } 9251 9252 clp->cl_seqid++; 9253 if (!status) { 9254 /* Verify the session's negotiated channel_attrs values */ 9255 status = nfs4_verify_channel_attrs(&args, &res); 9256 /* Increment the clientid slot sequence id */ 9257 if (status) 9258 goto out; 9259 nfs4_update_session(session, &res); 9260 } 9261 out: 9262 return status; 9263 } 9264 9265 /* 9266 * Issues a CREATE_SESSION operation to the server. 9267 * It is the responsibility of the caller to verify the session is 9268 * expired before calling this routine. 9269 */ 9270 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9271 { 9272 int status; 9273 unsigned *ptr; 9274 struct nfs4_session *session = clp->cl_session; 9275 struct nfs4_add_xprt_data xprtdata = { 9276 .clp = clp, 9277 }; 9278 struct rpc_add_xprt_test rpcdata = { 9279 .add_xprt_test = clp->cl_mvops->session_trunk, 9280 .data = &xprtdata, 9281 }; 9282 9283 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9284 9285 status = _nfs4_proc_create_session(clp, cred); 9286 if (status) 9287 goto out; 9288 9289 /* Init or reset the session slot tables */ 9290 status = nfs4_setup_session_slot_tables(session); 9291 dprintk("slot table setup returned %d\n", status); 9292 if (status) 9293 goto out; 9294 9295 ptr = (unsigned *)&session->sess_id.data[0]; 9296 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9297 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9298 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9299 out: 9300 return status; 9301 } 9302 9303 /* 9304 * Issue the over-the-wire RPC DESTROY_SESSION. 9305 * The caller must serialize access to this routine. 9306 */ 9307 int nfs4_proc_destroy_session(struct nfs4_session *session, 9308 const struct cred *cred) 9309 { 9310 struct rpc_message msg = { 9311 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9312 .rpc_argp = session, 9313 .rpc_cred = cred, 9314 }; 9315 int status = 0; 9316 9317 /* session is still being setup */ 9318 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9319 return 0; 9320 9321 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9322 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9323 trace_nfs4_destroy_session(session->clp, status); 9324 9325 if (status) 9326 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9327 "Session has been destroyed regardless...\n", status); 9328 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9329 return status; 9330 } 9331 9332 /* 9333 * Renew the cl_session lease. 9334 */ 9335 struct nfs4_sequence_data { 9336 struct nfs_client *clp; 9337 struct nfs4_sequence_args args; 9338 struct nfs4_sequence_res res; 9339 }; 9340 9341 static void nfs41_sequence_release(void *data) 9342 { 9343 struct nfs4_sequence_data *calldata = data; 9344 struct nfs_client *clp = calldata->clp; 9345 9346 if (refcount_read(&clp->cl_count) > 1) 9347 nfs4_schedule_state_renewal(clp); 9348 nfs_put_client(clp); 9349 kfree(calldata); 9350 } 9351 9352 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9353 { 9354 switch(task->tk_status) { 9355 case -NFS4ERR_DELAY: 9356 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9357 return -EAGAIN; 9358 default: 9359 nfs4_schedule_lease_recovery(clp); 9360 } 9361 return 0; 9362 } 9363 9364 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9365 { 9366 struct nfs4_sequence_data *calldata = data; 9367 struct nfs_client *clp = calldata->clp; 9368 9369 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9370 return; 9371 9372 trace_nfs4_sequence(clp, task->tk_status); 9373 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9374 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9375 if (refcount_read(&clp->cl_count) == 1) 9376 return; 9377 9378 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9379 rpc_restart_call_prepare(task); 9380 return; 9381 } 9382 } 9383 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9384 } 9385 9386 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9387 { 9388 struct nfs4_sequence_data *calldata = data; 9389 struct nfs_client *clp = calldata->clp; 9390 struct nfs4_sequence_args *args; 9391 struct nfs4_sequence_res *res; 9392 9393 args = task->tk_msg.rpc_argp; 9394 res = task->tk_msg.rpc_resp; 9395 9396 nfs4_setup_sequence(clp, args, res, task); 9397 } 9398 9399 static const struct rpc_call_ops nfs41_sequence_ops = { 9400 .rpc_call_done = nfs41_sequence_call_done, 9401 .rpc_call_prepare = nfs41_sequence_prepare, 9402 .rpc_release = nfs41_sequence_release, 9403 }; 9404 9405 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9406 const struct cred *cred, 9407 struct nfs4_slot *slot, 9408 bool is_privileged) 9409 { 9410 struct nfs4_sequence_data *calldata; 9411 struct rpc_message msg = { 9412 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9413 .rpc_cred = cred, 9414 }; 9415 struct rpc_task_setup task_setup_data = { 9416 .rpc_client = clp->cl_rpcclient, 9417 .rpc_message = &msg, 9418 .callback_ops = &nfs41_sequence_ops, 9419 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9420 }; 9421 struct rpc_task *ret; 9422 9423 ret = ERR_PTR(-EIO); 9424 if (!refcount_inc_not_zero(&clp->cl_count)) 9425 goto out_err; 9426 9427 ret = ERR_PTR(-ENOMEM); 9428 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9429 if (calldata == NULL) 9430 goto out_put_clp; 9431 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9432 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9433 msg.rpc_argp = &calldata->args; 9434 msg.rpc_resp = &calldata->res; 9435 calldata->clp = clp; 9436 task_setup_data.callback_data = calldata; 9437 9438 ret = rpc_run_task(&task_setup_data); 9439 if (IS_ERR(ret)) 9440 goto out_err; 9441 return ret; 9442 out_put_clp: 9443 nfs_put_client(clp); 9444 out_err: 9445 nfs41_release_slot(slot); 9446 return ret; 9447 } 9448 9449 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9450 { 9451 struct rpc_task *task; 9452 int ret = 0; 9453 9454 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9455 return -EAGAIN; 9456 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9457 if (IS_ERR(task)) 9458 ret = PTR_ERR(task); 9459 else 9460 rpc_put_task_async(task); 9461 dprintk("<-- %s status=%d\n", __func__, ret); 9462 return ret; 9463 } 9464 9465 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9466 { 9467 struct rpc_task *task; 9468 int ret; 9469 9470 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9471 if (IS_ERR(task)) { 9472 ret = PTR_ERR(task); 9473 goto out; 9474 } 9475 ret = rpc_wait_for_completion_task(task); 9476 if (!ret) 9477 ret = task->tk_status; 9478 rpc_put_task(task); 9479 out: 9480 dprintk("<-- %s status=%d\n", __func__, ret); 9481 return ret; 9482 } 9483 9484 struct nfs4_reclaim_complete_data { 9485 struct nfs_client *clp; 9486 struct nfs41_reclaim_complete_args arg; 9487 struct nfs41_reclaim_complete_res res; 9488 }; 9489 9490 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9491 { 9492 struct nfs4_reclaim_complete_data *calldata = data; 9493 9494 nfs4_setup_sequence(calldata->clp, 9495 &calldata->arg.seq_args, 9496 &calldata->res.seq_res, 9497 task); 9498 } 9499 9500 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9501 { 9502 switch(task->tk_status) { 9503 case 0: 9504 wake_up_all(&clp->cl_lock_waitq); 9505 fallthrough; 9506 case -NFS4ERR_COMPLETE_ALREADY: 9507 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9508 break; 9509 case -NFS4ERR_DELAY: 9510 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9511 fallthrough; 9512 case -NFS4ERR_RETRY_UNCACHED_REP: 9513 case -EACCES: 9514 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9515 __func__, task->tk_status, clp->cl_hostname); 9516 return -EAGAIN; 9517 case -NFS4ERR_BADSESSION: 9518 case -NFS4ERR_DEADSESSION: 9519 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9520 break; 9521 default: 9522 nfs4_schedule_lease_recovery(clp); 9523 } 9524 return 0; 9525 } 9526 9527 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9528 { 9529 struct nfs4_reclaim_complete_data *calldata = data; 9530 struct nfs_client *clp = calldata->clp; 9531 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9532 9533 if (!nfs41_sequence_done(task, res)) 9534 return; 9535 9536 trace_nfs4_reclaim_complete(clp, task->tk_status); 9537 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9538 rpc_restart_call_prepare(task); 9539 return; 9540 } 9541 } 9542 9543 static void nfs4_free_reclaim_complete_data(void *data) 9544 { 9545 struct nfs4_reclaim_complete_data *calldata = data; 9546 9547 kfree(calldata); 9548 } 9549 9550 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9551 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9552 .rpc_call_done = nfs4_reclaim_complete_done, 9553 .rpc_release = nfs4_free_reclaim_complete_data, 9554 }; 9555 9556 /* 9557 * Issue a global reclaim complete. 9558 */ 9559 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9560 const struct cred *cred) 9561 { 9562 struct nfs4_reclaim_complete_data *calldata; 9563 struct rpc_message msg = { 9564 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9565 .rpc_cred = cred, 9566 }; 9567 struct rpc_task_setup task_setup_data = { 9568 .rpc_client = clp->cl_rpcclient, 9569 .rpc_message = &msg, 9570 .callback_ops = &nfs4_reclaim_complete_call_ops, 9571 .flags = RPC_TASK_NO_ROUND_ROBIN, 9572 }; 9573 int status = -ENOMEM; 9574 9575 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9576 if (calldata == NULL) 9577 goto out; 9578 calldata->clp = clp; 9579 calldata->arg.one_fs = 0; 9580 9581 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9582 msg.rpc_argp = &calldata->arg; 9583 msg.rpc_resp = &calldata->res; 9584 task_setup_data.callback_data = calldata; 9585 status = nfs4_call_sync_custom(&task_setup_data); 9586 out: 9587 dprintk("<-- %s status=%d\n", __func__, status); 9588 return status; 9589 } 9590 9591 static void 9592 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9593 { 9594 struct nfs4_layoutget *lgp = calldata; 9595 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9596 9597 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9598 &lgp->res.seq_res, task); 9599 } 9600 9601 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9602 { 9603 struct nfs4_layoutget *lgp = calldata; 9604 9605 nfs41_sequence_process(task, &lgp->res.seq_res); 9606 } 9607 9608 static int 9609 nfs4_layoutget_handle_exception(struct rpc_task *task, 9610 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9611 { 9612 struct inode *inode = lgp->args.inode; 9613 struct nfs_server *server = NFS_SERVER(inode); 9614 struct pnfs_layout_hdr *lo = lgp->lo; 9615 int nfs4err = task->tk_status; 9616 int err, status = 0; 9617 LIST_HEAD(head); 9618 9619 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9620 9621 nfs4_sequence_free_slot(&lgp->res.seq_res); 9622 9623 switch (nfs4err) { 9624 case 0: 9625 goto out; 9626 9627 /* 9628 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9629 * on the file. set tk_status to -ENODATA to tell upper layer to 9630 * retry go inband. 9631 */ 9632 case -NFS4ERR_LAYOUTUNAVAILABLE: 9633 status = -ENODATA; 9634 goto out; 9635 /* 9636 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9637 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9638 */ 9639 case -NFS4ERR_BADLAYOUT: 9640 status = -EOVERFLOW; 9641 goto out; 9642 /* 9643 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9644 * (or clients) writing to the same RAID stripe except when 9645 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9646 * 9647 * Treat it like we would RECALLCONFLICT -- we retry for a little 9648 * while, and then eventually give up. 9649 */ 9650 case -NFS4ERR_LAYOUTTRYLATER: 9651 if (lgp->args.minlength == 0) { 9652 status = -EOVERFLOW; 9653 goto out; 9654 } 9655 status = -EBUSY; 9656 break; 9657 case -NFS4ERR_RECALLCONFLICT: 9658 status = -ERECALLCONFLICT; 9659 break; 9660 case -NFS4ERR_DELEG_REVOKED: 9661 case -NFS4ERR_ADMIN_REVOKED: 9662 case -NFS4ERR_EXPIRED: 9663 case -NFS4ERR_BAD_STATEID: 9664 exception->timeout = 0; 9665 spin_lock(&inode->i_lock); 9666 /* If the open stateid was bad, then recover it. */ 9667 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9668 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9669 spin_unlock(&inode->i_lock); 9670 exception->state = lgp->args.ctx->state; 9671 exception->stateid = &lgp->args.stateid; 9672 break; 9673 } 9674 9675 /* 9676 * Mark the bad layout state as invalid, then retry 9677 */ 9678 pnfs_mark_layout_stateid_invalid(lo, &head); 9679 spin_unlock(&inode->i_lock); 9680 nfs_commit_inode(inode, 0); 9681 pnfs_free_lseg_list(&head); 9682 status = -EAGAIN; 9683 goto out; 9684 } 9685 9686 err = nfs4_handle_exception(server, nfs4err, exception); 9687 if (!status) { 9688 if (exception->retry) 9689 status = -EAGAIN; 9690 else 9691 status = err; 9692 } 9693 out: 9694 return status; 9695 } 9696 9697 size_t max_response_pages(struct nfs_server *server) 9698 { 9699 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9700 return nfs_page_array_len(0, max_resp_sz); 9701 } 9702 9703 static void nfs4_layoutget_release(void *calldata) 9704 { 9705 struct nfs4_layoutget *lgp = calldata; 9706 9707 nfs4_sequence_free_slot(&lgp->res.seq_res); 9708 pnfs_layoutget_free(lgp); 9709 } 9710 9711 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9712 .rpc_call_prepare = nfs4_layoutget_prepare, 9713 .rpc_call_done = nfs4_layoutget_done, 9714 .rpc_release = nfs4_layoutget_release, 9715 }; 9716 9717 struct pnfs_layout_segment * 9718 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9719 { 9720 struct inode *inode = lgp->args.inode; 9721 struct nfs_server *server = NFS_SERVER(inode); 9722 struct rpc_task *task; 9723 struct rpc_message msg = { 9724 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9725 .rpc_argp = &lgp->args, 9726 .rpc_resp = &lgp->res, 9727 .rpc_cred = lgp->cred, 9728 }; 9729 struct rpc_task_setup task_setup_data = { 9730 .rpc_client = server->client, 9731 .rpc_message = &msg, 9732 .callback_ops = &nfs4_layoutget_call_ops, 9733 .callback_data = lgp, 9734 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9735 RPC_TASK_MOVEABLE, 9736 }; 9737 struct pnfs_layout_segment *lseg = NULL; 9738 struct nfs4_exception exception = { 9739 .inode = inode, 9740 .timeout = *timeout, 9741 }; 9742 int status = 0; 9743 9744 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9745 9746 task = rpc_run_task(&task_setup_data); 9747 if (IS_ERR(task)) 9748 return ERR_CAST(task); 9749 9750 status = rpc_wait_for_completion_task(task); 9751 if (status != 0) 9752 goto out; 9753 9754 if (task->tk_status < 0) { 9755 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9756 *timeout = exception.timeout; 9757 } else if (lgp->res.layoutp->len == 0) { 9758 status = -EAGAIN; 9759 *timeout = nfs4_update_delay(&exception.timeout); 9760 } else 9761 lseg = pnfs_layout_process(lgp); 9762 out: 9763 trace_nfs4_layoutget(lgp->args.ctx, 9764 &lgp->args.range, 9765 &lgp->res.range, 9766 &lgp->res.stateid, 9767 status); 9768 9769 rpc_put_task(task); 9770 dprintk("<-- %s status=%d\n", __func__, status); 9771 if (status) 9772 return ERR_PTR(status); 9773 return lseg; 9774 } 9775 9776 static void 9777 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9778 { 9779 struct nfs4_layoutreturn *lrp = calldata; 9780 9781 nfs4_setup_sequence(lrp->clp, 9782 &lrp->args.seq_args, 9783 &lrp->res.seq_res, 9784 task); 9785 if (!pnfs_layout_is_valid(lrp->args.layout)) 9786 rpc_exit(task, 0); 9787 } 9788 9789 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9790 { 9791 struct nfs4_layoutreturn *lrp = calldata; 9792 struct nfs_server *server; 9793 9794 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9795 return; 9796 9797 /* 9798 * Was there an RPC level error? Assume the call succeeded, 9799 * and that we need to release the layout 9800 */ 9801 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9802 lrp->res.lrs_present = 0; 9803 return; 9804 } 9805 9806 server = NFS_SERVER(lrp->args.inode); 9807 switch (task->tk_status) { 9808 case -NFS4ERR_OLD_STATEID: 9809 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9810 &lrp->args.range, 9811 lrp->args.inode)) 9812 goto out_restart; 9813 fallthrough; 9814 default: 9815 task->tk_status = 0; 9816 fallthrough; 9817 case 0: 9818 break; 9819 case -NFS4ERR_DELAY: 9820 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9821 break; 9822 goto out_restart; 9823 } 9824 return; 9825 out_restart: 9826 task->tk_status = 0; 9827 nfs4_sequence_free_slot(&lrp->res.seq_res); 9828 rpc_restart_call_prepare(task); 9829 } 9830 9831 static void nfs4_layoutreturn_release(void *calldata) 9832 { 9833 struct nfs4_layoutreturn *lrp = calldata; 9834 struct pnfs_layout_hdr *lo = lrp->args.layout; 9835 9836 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9837 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9838 nfs4_sequence_free_slot(&lrp->res.seq_res); 9839 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9840 lrp->ld_private.ops->free(&lrp->ld_private); 9841 pnfs_put_layout_hdr(lrp->args.layout); 9842 nfs_iput_and_deactive(lrp->inode); 9843 put_cred(lrp->cred); 9844 kfree(calldata); 9845 } 9846 9847 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9848 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9849 .rpc_call_done = nfs4_layoutreturn_done, 9850 .rpc_release = nfs4_layoutreturn_release, 9851 }; 9852 9853 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9854 { 9855 struct rpc_task *task; 9856 struct rpc_message msg = { 9857 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9858 .rpc_argp = &lrp->args, 9859 .rpc_resp = &lrp->res, 9860 .rpc_cred = lrp->cred, 9861 }; 9862 struct rpc_task_setup task_setup_data = { 9863 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9864 .rpc_message = &msg, 9865 .callback_ops = &nfs4_layoutreturn_call_ops, 9866 .callback_data = lrp, 9867 .flags = RPC_TASK_MOVEABLE, 9868 }; 9869 int status = 0; 9870 9871 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9872 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9873 &task_setup_data.rpc_client, &msg); 9874 9875 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9876 if (!sync) { 9877 if (!lrp->inode) { 9878 nfs4_layoutreturn_release(lrp); 9879 return -EAGAIN; 9880 } 9881 task_setup_data.flags |= RPC_TASK_ASYNC; 9882 } 9883 if (!lrp->inode) 9884 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9885 1); 9886 else 9887 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9888 0); 9889 task = rpc_run_task(&task_setup_data); 9890 if (IS_ERR(task)) 9891 return PTR_ERR(task); 9892 if (sync) 9893 status = task->tk_status; 9894 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9895 dprintk("<-- %s status=%d\n", __func__, status); 9896 rpc_put_task(task); 9897 return status; 9898 } 9899 9900 static int 9901 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9902 struct pnfs_device *pdev, 9903 const struct cred *cred) 9904 { 9905 struct nfs4_getdeviceinfo_args args = { 9906 .pdev = pdev, 9907 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9908 NOTIFY_DEVICEID4_DELETE, 9909 }; 9910 struct nfs4_getdeviceinfo_res res = { 9911 .pdev = pdev, 9912 }; 9913 struct rpc_message msg = { 9914 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9915 .rpc_argp = &args, 9916 .rpc_resp = &res, 9917 .rpc_cred = cred, 9918 }; 9919 int status; 9920 9921 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9922 if (res.notification & ~args.notify_types) 9923 dprintk("%s: unsupported notification\n", __func__); 9924 if (res.notification != args.notify_types) 9925 pdev->nocache = 1; 9926 9927 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9928 9929 dprintk("<-- %s status=%d\n", __func__, status); 9930 9931 return status; 9932 } 9933 9934 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9935 struct pnfs_device *pdev, 9936 const struct cred *cred) 9937 { 9938 struct nfs4_exception exception = { }; 9939 int err; 9940 9941 do { 9942 err = nfs4_handle_exception(server, 9943 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9944 &exception); 9945 } while (exception.retry); 9946 return err; 9947 } 9948 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9949 9950 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9951 { 9952 struct nfs4_layoutcommit_data *data = calldata; 9953 struct nfs_server *server = NFS_SERVER(data->args.inode); 9954 9955 nfs4_setup_sequence(server->nfs_client, 9956 &data->args.seq_args, 9957 &data->res.seq_res, 9958 task); 9959 } 9960 9961 static void 9962 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9963 { 9964 struct nfs4_layoutcommit_data *data = calldata; 9965 struct nfs_server *server = NFS_SERVER(data->args.inode); 9966 9967 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9968 return; 9969 9970 switch (task->tk_status) { /* Just ignore these failures */ 9971 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9972 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9973 case -NFS4ERR_BADLAYOUT: /* no layout */ 9974 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9975 task->tk_status = 0; 9976 break; 9977 case 0: 9978 break; 9979 default: 9980 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9981 rpc_restart_call_prepare(task); 9982 return; 9983 } 9984 } 9985 } 9986 9987 static void nfs4_layoutcommit_release(void *calldata) 9988 { 9989 struct nfs4_layoutcommit_data *data = calldata; 9990 9991 pnfs_cleanup_layoutcommit(data); 9992 nfs_post_op_update_inode_force_wcc(data->args.inode, 9993 data->res.fattr); 9994 put_cred(data->cred); 9995 nfs_iput_and_deactive(data->inode); 9996 kfree(data); 9997 } 9998 9999 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10000 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10001 .rpc_call_done = nfs4_layoutcommit_done, 10002 .rpc_release = nfs4_layoutcommit_release, 10003 }; 10004 10005 int 10006 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10007 { 10008 struct rpc_message msg = { 10009 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10010 .rpc_argp = &data->args, 10011 .rpc_resp = &data->res, 10012 .rpc_cred = data->cred, 10013 }; 10014 struct rpc_task_setup task_setup_data = { 10015 .task = &data->task, 10016 .rpc_client = NFS_CLIENT(data->args.inode), 10017 .rpc_message = &msg, 10018 .callback_ops = &nfs4_layoutcommit_ops, 10019 .callback_data = data, 10020 .flags = RPC_TASK_MOVEABLE, 10021 }; 10022 struct rpc_task *task; 10023 int status = 0; 10024 10025 dprintk("NFS: initiating layoutcommit call. sync %d " 10026 "lbw: %llu inode %lu\n", sync, 10027 data->args.lastbytewritten, 10028 data->args.inode->i_ino); 10029 10030 if (!sync) { 10031 data->inode = nfs_igrab_and_active(data->args.inode); 10032 if (data->inode == NULL) { 10033 nfs4_layoutcommit_release(data); 10034 return -EAGAIN; 10035 } 10036 task_setup_data.flags = RPC_TASK_ASYNC; 10037 } 10038 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10039 task = rpc_run_task(&task_setup_data); 10040 if (IS_ERR(task)) 10041 return PTR_ERR(task); 10042 if (sync) 10043 status = task->tk_status; 10044 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10045 dprintk("%s: status %d\n", __func__, status); 10046 rpc_put_task(task); 10047 return status; 10048 } 10049 10050 /* 10051 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10052 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10053 */ 10054 static int 10055 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10056 struct nfs_fsinfo *info, 10057 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10058 { 10059 struct nfs41_secinfo_no_name_args args = { 10060 .style = SECINFO_STYLE_CURRENT_FH, 10061 }; 10062 struct nfs4_secinfo_res res = { 10063 .flavors = flavors, 10064 }; 10065 struct rpc_message msg = { 10066 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10067 .rpc_argp = &args, 10068 .rpc_resp = &res, 10069 }; 10070 struct nfs4_call_sync_data data = { 10071 .seq_server = server, 10072 .seq_args = &args.seq_args, 10073 .seq_res = &res.seq_res, 10074 }; 10075 struct rpc_task_setup task_setup = { 10076 .rpc_client = server->client, 10077 .rpc_message = &msg, 10078 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10079 .callback_data = &data, 10080 .flags = RPC_TASK_NO_ROUND_ROBIN, 10081 }; 10082 const struct cred *cred = NULL; 10083 int status; 10084 10085 if (use_integrity) { 10086 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10087 10088 cred = nfs4_get_clid_cred(server->nfs_client); 10089 msg.rpc_cred = cred; 10090 } 10091 10092 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10093 status = nfs4_call_sync_custom(&task_setup); 10094 dprintk("<-- %s status=%d\n", __func__, status); 10095 10096 put_cred(cred); 10097 10098 return status; 10099 } 10100 10101 static int 10102 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10103 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10104 { 10105 struct nfs4_exception exception = { 10106 .interruptible = true, 10107 }; 10108 int err; 10109 do { 10110 /* first try using integrity protection */ 10111 err = -NFS4ERR_WRONGSEC; 10112 10113 /* try to use integrity protection with machine cred */ 10114 if (_nfs4_is_integrity_protected(server->nfs_client)) 10115 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10116 flavors, true); 10117 10118 /* 10119 * if unable to use integrity protection, or SECINFO with 10120 * integrity protection returns NFS4ERR_WRONGSEC (which is 10121 * disallowed by spec, but exists in deployed servers) use 10122 * the current filesystem's rpc_client and the user cred. 10123 */ 10124 if (err == -NFS4ERR_WRONGSEC) 10125 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10126 flavors, false); 10127 10128 switch (err) { 10129 case 0: 10130 case -NFS4ERR_WRONGSEC: 10131 case -ENOTSUPP: 10132 goto out; 10133 default: 10134 err = nfs4_handle_exception(server, err, &exception); 10135 } 10136 } while (exception.retry); 10137 out: 10138 return err; 10139 } 10140 10141 static int 10142 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10143 struct nfs_fsinfo *info) 10144 { 10145 int err; 10146 struct page *page; 10147 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10148 struct nfs4_secinfo_flavors *flavors; 10149 struct nfs4_secinfo4 *secinfo; 10150 int i; 10151 10152 page = alloc_page(GFP_KERNEL); 10153 if (!page) { 10154 err = -ENOMEM; 10155 goto out; 10156 } 10157 10158 flavors = page_address(page); 10159 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10160 10161 /* 10162 * Fall back on "guess and check" method if 10163 * the server doesn't support SECINFO_NO_NAME 10164 */ 10165 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10166 err = nfs4_find_root_sec(server, fhandle, info); 10167 goto out_freepage; 10168 } 10169 if (err) 10170 goto out_freepage; 10171 10172 for (i = 0; i < flavors->num_flavors; i++) { 10173 secinfo = &flavors->flavors[i]; 10174 10175 switch (secinfo->flavor) { 10176 case RPC_AUTH_NULL: 10177 case RPC_AUTH_UNIX: 10178 case RPC_AUTH_GSS: 10179 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10180 &secinfo->flavor_info); 10181 break; 10182 default: 10183 flavor = RPC_AUTH_MAXFLAVOR; 10184 break; 10185 } 10186 10187 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10188 flavor = RPC_AUTH_MAXFLAVOR; 10189 10190 if (flavor != RPC_AUTH_MAXFLAVOR) { 10191 err = nfs4_lookup_root_sec(server, fhandle, 10192 info, flavor); 10193 if (!err) 10194 break; 10195 } 10196 } 10197 10198 if (flavor == RPC_AUTH_MAXFLAVOR) 10199 err = -EPERM; 10200 10201 out_freepage: 10202 put_page(page); 10203 if (err == -EACCES) 10204 return -EPERM; 10205 out: 10206 return err; 10207 } 10208 10209 static int _nfs41_test_stateid(struct nfs_server *server, 10210 nfs4_stateid *stateid, 10211 const struct cred *cred) 10212 { 10213 int status; 10214 struct nfs41_test_stateid_args args = { 10215 .stateid = stateid, 10216 }; 10217 struct nfs41_test_stateid_res res; 10218 struct rpc_message msg = { 10219 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10220 .rpc_argp = &args, 10221 .rpc_resp = &res, 10222 .rpc_cred = cred, 10223 }; 10224 struct rpc_clnt *rpc_client = server->client; 10225 10226 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10227 &rpc_client, &msg); 10228 10229 dprintk("NFS call test_stateid %p\n", stateid); 10230 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10231 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10232 &args.seq_args, &res.seq_res); 10233 if (status != NFS_OK) { 10234 dprintk("NFS reply test_stateid: failed, %d\n", status); 10235 return status; 10236 } 10237 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10238 return -res.status; 10239 } 10240 10241 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10242 int err, struct nfs4_exception *exception) 10243 { 10244 exception->retry = 0; 10245 switch(err) { 10246 case -NFS4ERR_DELAY: 10247 case -NFS4ERR_RETRY_UNCACHED_REP: 10248 nfs4_handle_exception(server, err, exception); 10249 break; 10250 case -NFS4ERR_BADSESSION: 10251 case -NFS4ERR_BADSLOT: 10252 case -NFS4ERR_BAD_HIGH_SLOT: 10253 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10254 case -NFS4ERR_DEADSESSION: 10255 nfs4_do_handle_exception(server, err, exception); 10256 } 10257 } 10258 10259 /** 10260 * nfs41_test_stateid - perform a TEST_STATEID operation 10261 * 10262 * @server: server / transport on which to perform the operation 10263 * @stateid: state ID to test 10264 * @cred: credential 10265 * 10266 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10267 * Otherwise a negative NFS4ERR value is returned if the operation 10268 * failed or the state ID is not currently valid. 10269 */ 10270 static int nfs41_test_stateid(struct nfs_server *server, 10271 nfs4_stateid *stateid, 10272 const struct cred *cred) 10273 { 10274 struct nfs4_exception exception = { 10275 .interruptible = true, 10276 }; 10277 int err; 10278 do { 10279 err = _nfs41_test_stateid(server, stateid, cred); 10280 nfs4_handle_delay_or_session_error(server, err, &exception); 10281 } while (exception.retry); 10282 return err; 10283 } 10284 10285 struct nfs_free_stateid_data { 10286 struct nfs_server *server; 10287 struct nfs41_free_stateid_args args; 10288 struct nfs41_free_stateid_res res; 10289 }; 10290 10291 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10292 { 10293 struct nfs_free_stateid_data *data = calldata; 10294 nfs4_setup_sequence(data->server->nfs_client, 10295 &data->args.seq_args, 10296 &data->res.seq_res, 10297 task); 10298 } 10299 10300 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10301 { 10302 struct nfs_free_stateid_data *data = calldata; 10303 10304 nfs41_sequence_done(task, &data->res.seq_res); 10305 10306 switch (task->tk_status) { 10307 case -NFS4ERR_DELAY: 10308 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10309 rpc_restart_call_prepare(task); 10310 } 10311 } 10312 10313 static void nfs41_free_stateid_release(void *calldata) 10314 { 10315 struct nfs_free_stateid_data *data = calldata; 10316 struct nfs_client *clp = data->server->nfs_client; 10317 10318 nfs_put_client(clp); 10319 kfree(calldata); 10320 } 10321 10322 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10323 .rpc_call_prepare = nfs41_free_stateid_prepare, 10324 .rpc_call_done = nfs41_free_stateid_done, 10325 .rpc_release = nfs41_free_stateid_release, 10326 }; 10327 10328 /** 10329 * nfs41_free_stateid - perform a FREE_STATEID operation 10330 * 10331 * @server: server / transport on which to perform the operation 10332 * @stateid: state ID to release 10333 * @cred: credential 10334 * @privileged: set to true if this call needs to be privileged 10335 * 10336 * Note: this function is always asynchronous. 10337 */ 10338 static int nfs41_free_stateid(struct nfs_server *server, 10339 const nfs4_stateid *stateid, 10340 const struct cred *cred, 10341 bool privileged) 10342 { 10343 struct rpc_message msg = { 10344 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10345 .rpc_cred = cred, 10346 }; 10347 struct rpc_task_setup task_setup = { 10348 .rpc_client = server->client, 10349 .rpc_message = &msg, 10350 .callback_ops = &nfs41_free_stateid_ops, 10351 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10352 }; 10353 struct nfs_free_stateid_data *data; 10354 struct rpc_task *task; 10355 struct nfs_client *clp = server->nfs_client; 10356 10357 if (!refcount_inc_not_zero(&clp->cl_count)) 10358 return -EIO; 10359 10360 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10361 &task_setup.rpc_client, &msg); 10362 10363 dprintk("NFS call free_stateid %p\n", stateid); 10364 data = kmalloc(sizeof(*data), GFP_KERNEL); 10365 if (!data) 10366 return -ENOMEM; 10367 data->server = server; 10368 nfs4_stateid_copy(&data->args.stateid, stateid); 10369 10370 task_setup.callback_data = data; 10371 10372 msg.rpc_argp = &data->args; 10373 msg.rpc_resp = &data->res; 10374 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10375 task = rpc_run_task(&task_setup); 10376 if (IS_ERR(task)) 10377 return PTR_ERR(task); 10378 rpc_put_task(task); 10379 return 0; 10380 } 10381 10382 static void 10383 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10384 { 10385 const struct cred *cred = lsp->ls_state->owner->so_cred; 10386 10387 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10388 nfs4_free_lock_state(server, lsp); 10389 } 10390 10391 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10392 const nfs4_stateid *s2) 10393 { 10394 if (s1->type != s2->type) 10395 return false; 10396 10397 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10398 return false; 10399 10400 if (s1->seqid == s2->seqid) 10401 return true; 10402 10403 return s1->seqid == 0 || s2->seqid == 0; 10404 } 10405 10406 #endif /* CONFIG_NFS_V4_1 */ 10407 10408 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10409 const nfs4_stateid *s2) 10410 { 10411 return nfs4_stateid_match(s1, s2); 10412 } 10413 10414 10415 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10416 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10417 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10418 .recover_open = nfs4_open_reclaim, 10419 .recover_lock = nfs4_lock_reclaim, 10420 .establish_clid = nfs4_init_clientid, 10421 .detect_trunking = nfs40_discover_server_trunking, 10422 }; 10423 10424 #if defined(CONFIG_NFS_V4_1) 10425 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10426 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10427 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10428 .recover_open = nfs4_open_reclaim, 10429 .recover_lock = nfs4_lock_reclaim, 10430 .establish_clid = nfs41_init_clientid, 10431 .reclaim_complete = nfs41_proc_reclaim_complete, 10432 .detect_trunking = nfs41_discover_server_trunking, 10433 }; 10434 #endif /* CONFIG_NFS_V4_1 */ 10435 10436 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10437 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10438 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10439 .recover_open = nfs40_open_expired, 10440 .recover_lock = nfs4_lock_expired, 10441 .establish_clid = nfs4_init_clientid, 10442 }; 10443 10444 #if defined(CONFIG_NFS_V4_1) 10445 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10446 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10447 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10448 .recover_open = nfs41_open_expired, 10449 .recover_lock = nfs41_lock_expired, 10450 .establish_clid = nfs41_init_clientid, 10451 }; 10452 #endif /* CONFIG_NFS_V4_1 */ 10453 10454 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10455 .sched_state_renewal = nfs4_proc_async_renew, 10456 .get_state_renewal_cred = nfs4_get_renew_cred, 10457 .renew_lease = nfs4_proc_renew, 10458 }; 10459 10460 #if defined(CONFIG_NFS_V4_1) 10461 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10462 .sched_state_renewal = nfs41_proc_async_sequence, 10463 .get_state_renewal_cred = nfs4_get_machine_cred, 10464 .renew_lease = nfs4_proc_sequence, 10465 }; 10466 #endif 10467 10468 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10469 .get_locations = _nfs40_proc_get_locations, 10470 .fsid_present = _nfs40_proc_fsid_present, 10471 }; 10472 10473 #if defined(CONFIG_NFS_V4_1) 10474 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10475 .get_locations = _nfs41_proc_get_locations, 10476 .fsid_present = _nfs41_proc_fsid_present, 10477 }; 10478 #endif /* CONFIG_NFS_V4_1 */ 10479 10480 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10481 .minor_version = 0, 10482 .init_caps = NFS_CAP_READDIRPLUS 10483 | NFS_CAP_ATOMIC_OPEN 10484 | NFS_CAP_POSIX_LOCK, 10485 .init_client = nfs40_init_client, 10486 .shutdown_client = nfs40_shutdown_client, 10487 .match_stateid = nfs4_match_stateid, 10488 .find_root_sec = nfs4_find_root_sec, 10489 .free_lock_state = nfs4_release_lockowner, 10490 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10491 .alloc_seqid = nfs_alloc_seqid, 10492 .call_sync_ops = &nfs40_call_sync_ops, 10493 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10494 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10495 .state_renewal_ops = &nfs40_state_renewal_ops, 10496 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10497 }; 10498 10499 #if defined(CONFIG_NFS_V4_1) 10500 static struct nfs_seqid * 10501 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10502 { 10503 return NULL; 10504 } 10505 10506 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10507 .minor_version = 1, 10508 .init_caps = NFS_CAP_READDIRPLUS 10509 | NFS_CAP_ATOMIC_OPEN 10510 | NFS_CAP_POSIX_LOCK 10511 | NFS_CAP_STATEID_NFSV41 10512 | NFS_CAP_ATOMIC_OPEN_V1 10513 | NFS_CAP_LGOPEN 10514 | NFS_CAP_MOVEABLE, 10515 .init_client = nfs41_init_client, 10516 .shutdown_client = nfs41_shutdown_client, 10517 .match_stateid = nfs41_match_stateid, 10518 .find_root_sec = nfs41_find_root_sec, 10519 .free_lock_state = nfs41_free_lock_state, 10520 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10521 .alloc_seqid = nfs_alloc_no_seqid, 10522 .session_trunk = nfs4_test_session_trunk, 10523 .call_sync_ops = &nfs41_call_sync_ops, 10524 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10525 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10526 .state_renewal_ops = &nfs41_state_renewal_ops, 10527 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10528 }; 10529 #endif 10530 10531 #if defined(CONFIG_NFS_V4_2) 10532 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10533 .minor_version = 2, 10534 .init_caps = NFS_CAP_READDIRPLUS 10535 | NFS_CAP_ATOMIC_OPEN 10536 | NFS_CAP_POSIX_LOCK 10537 | NFS_CAP_STATEID_NFSV41 10538 | NFS_CAP_ATOMIC_OPEN_V1 10539 | NFS_CAP_LGOPEN 10540 | NFS_CAP_ALLOCATE 10541 | NFS_CAP_COPY 10542 | NFS_CAP_OFFLOAD_CANCEL 10543 | NFS_CAP_COPY_NOTIFY 10544 | NFS_CAP_DEALLOCATE 10545 | NFS_CAP_SEEK 10546 | NFS_CAP_LAYOUTSTATS 10547 | NFS_CAP_CLONE 10548 | NFS_CAP_LAYOUTERROR 10549 | NFS_CAP_READ_PLUS 10550 | NFS_CAP_MOVEABLE, 10551 .init_client = nfs41_init_client, 10552 .shutdown_client = nfs41_shutdown_client, 10553 .match_stateid = nfs41_match_stateid, 10554 .find_root_sec = nfs41_find_root_sec, 10555 .free_lock_state = nfs41_free_lock_state, 10556 .call_sync_ops = &nfs41_call_sync_ops, 10557 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10558 .alloc_seqid = nfs_alloc_no_seqid, 10559 .session_trunk = nfs4_test_session_trunk, 10560 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10561 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10562 .state_renewal_ops = &nfs41_state_renewal_ops, 10563 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10564 }; 10565 #endif 10566 10567 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10568 [0] = &nfs_v4_0_minor_ops, 10569 #if defined(CONFIG_NFS_V4_1) 10570 [1] = &nfs_v4_1_minor_ops, 10571 #endif 10572 #if defined(CONFIG_NFS_V4_2) 10573 [2] = &nfs_v4_2_minor_ops, 10574 #endif 10575 }; 10576 10577 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10578 { 10579 ssize_t error, error2, error3; 10580 10581 error = generic_listxattr(dentry, list, size); 10582 if (error < 0) 10583 return error; 10584 if (list) { 10585 list += error; 10586 size -= error; 10587 } 10588 10589 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10590 if (error2 < 0) 10591 return error2; 10592 10593 if (list) { 10594 list += error2; 10595 size -= error2; 10596 } 10597 10598 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10599 if (error3 < 0) 10600 return error3; 10601 10602 return error + error2 + error3; 10603 } 10604 10605 static void nfs4_enable_swap(struct inode *inode) 10606 { 10607 /* The state manager thread must always be running. 10608 * It will notice the client is a swapper, and stay put. 10609 */ 10610 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10611 10612 nfs4_schedule_state_manager(clp); 10613 } 10614 10615 static void nfs4_disable_swap(struct inode *inode) 10616 { 10617 /* The state manager thread will now exit once it is 10618 * woken. 10619 */ 10620 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10621 10622 nfs4_schedule_state_manager(clp); 10623 } 10624 10625 static const struct inode_operations nfs4_dir_inode_operations = { 10626 .create = nfs_create, 10627 .lookup = nfs_lookup, 10628 .atomic_open = nfs_atomic_open, 10629 .link = nfs_link, 10630 .unlink = nfs_unlink, 10631 .symlink = nfs_symlink, 10632 .mkdir = nfs_mkdir, 10633 .rmdir = nfs_rmdir, 10634 .mknod = nfs_mknod, 10635 .rename = nfs_rename, 10636 .permission = nfs_permission, 10637 .getattr = nfs_getattr, 10638 .setattr = nfs_setattr, 10639 .listxattr = nfs4_listxattr, 10640 }; 10641 10642 static const struct inode_operations nfs4_file_inode_operations = { 10643 .permission = nfs_permission, 10644 .getattr = nfs_getattr, 10645 .setattr = nfs_setattr, 10646 .listxattr = nfs4_listxattr, 10647 }; 10648 10649 const struct nfs_rpc_ops nfs_v4_clientops = { 10650 .version = 4, /* protocol version */ 10651 .dentry_ops = &nfs4_dentry_operations, 10652 .dir_inode_ops = &nfs4_dir_inode_operations, 10653 .file_inode_ops = &nfs4_file_inode_operations, 10654 .file_ops = &nfs4_file_operations, 10655 .getroot = nfs4_proc_get_root, 10656 .submount = nfs4_submount, 10657 .try_get_tree = nfs4_try_get_tree, 10658 .getattr = nfs4_proc_getattr, 10659 .setattr = nfs4_proc_setattr, 10660 .lookup = nfs4_proc_lookup, 10661 .lookupp = nfs4_proc_lookupp, 10662 .access = nfs4_proc_access, 10663 .readlink = nfs4_proc_readlink, 10664 .create = nfs4_proc_create, 10665 .remove = nfs4_proc_remove, 10666 .unlink_setup = nfs4_proc_unlink_setup, 10667 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10668 .unlink_done = nfs4_proc_unlink_done, 10669 .rename_setup = nfs4_proc_rename_setup, 10670 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10671 .rename_done = nfs4_proc_rename_done, 10672 .link = nfs4_proc_link, 10673 .symlink = nfs4_proc_symlink, 10674 .mkdir = nfs4_proc_mkdir, 10675 .rmdir = nfs4_proc_rmdir, 10676 .readdir = nfs4_proc_readdir, 10677 .mknod = nfs4_proc_mknod, 10678 .statfs = nfs4_proc_statfs, 10679 .fsinfo = nfs4_proc_fsinfo, 10680 .pathconf = nfs4_proc_pathconf, 10681 .set_capabilities = nfs4_server_capabilities, 10682 .decode_dirent = nfs4_decode_dirent, 10683 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10684 .read_setup = nfs4_proc_read_setup, 10685 .read_done = nfs4_read_done, 10686 .write_setup = nfs4_proc_write_setup, 10687 .write_done = nfs4_write_done, 10688 .commit_setup = nfs4_proc_commit_setup, 10689 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10690 .commit_done = nfs4_commit_done, 10691 .lock = nfs4_proc_lock, 10692 .clear_acl_cache = nfs4_zap_acl_attr, 10693 .close_context = nfs4_close_context, 10694 .open_context = nfs4_atomic_open, 10695 .have_delegation = nfs4_have_delegation, 10696 .alloc_client = nfs4_alloc_client, 10697 .init_client = nfs4_init_client, 10698 .free_client = nfs4_free_client, 10699 .create_server = nfs4_create_server, 10700 .clone_server = nfs_clone_server, 10701 .discover_trunking = nfs4_discover_trunking, 10702 .enable_swap = nfs4_enable_swap, 10703 .disable_swap = nfs4_disable_swap, 10704 }; 10705 10706 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10707 .name = XATTR_NAME_NFSV4_ACL, 10708 .list = nfs4_xattr_list_nfs4_acl, 10709 .get = nfs4_xattr_get_nfs4_acl, 10710 .set = nfs4_xattr_set_nfs4_acl, 10711 }; 10712 10713 #if defined(CONFIG_NFS_V4_1) 10714 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10715 .name = XATTR_NAME_NFSV4_DACL, 10716 .list = nfs4_xattr_list_nfs4_dacl, 10717 .get = nfs4_xattr_get_nfs4_dacl, 10718 .set = nfs4_xattr_set_nfs4_dacl, 10719 }; 10720 10721 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10722 .name = XATTR_NAME_NFSV4_SACL, 10723 .list = nfs4_xattr_list_nfs4_sacl, 10724 .get = nfs4_xattr_get_nfs4_sacl, 10725 .set = nfs4_xattr_set_nfs4_sacl, 10726 }; 10727 #endif 10728 10729 #ifdef CONFIG_NFS_V4_2 10730 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10731 .prefix = XATTR_USER_PREFIX, 10732 .get = nfs4_xattr_get_nfs4_user, 10733 .set = nfs4_xattr_set_nfs4_user, 10734 }; 10735 #endif 10736 10737 const struct xattr_handler *nfs4_xattr_handlers[] = { 10738 &nfs4_xattr_nfs4_acl_handler, 10739 #if defined(CONFIG_NFS_V4_1) 10740 &nfs4_xattr_nfs4_dacl_handler, 10741 &nfs4_xattr_nfs4_sacl_handler, 10742 #endif 10743 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10744 &nfs4_xattr_nfs4_label_handler, 10745 #endif 10746 #ifdef CONFIG_NFS_V4_2 10747 &nfs4_xattr_nfs4_user_handler, 10748 #endif 10749 NULL 10750 }; 10751