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 case -NFS4ERR_RETURNCONFLICT: 174 return -EREMOTEIO; 175 case -NFS4ERR_WRONGSEC: 176 case -NFS4ERR_WRONG_CRED: 177 return -EPERM; 178 case -NFS4ERR_BADOWNER: 179 case -NFS4ERR_BADNAME: 180 return -EINVAL; 181 case -NFS4ERR_SHARE_DENIED: 182 return -EACCES; 183 case -NFS4ERR_MINOR_VERS_MISMATCH: 184 return -EPROTONOSUPPORT; 185 case -NFS4ERR_FILE_OPEN: 186 return -EBUSY; 187 case -NFS4ERR_NOT_SAME: 188 return -ENOTSYNC; 189 default: 190 dprintk("%s could not handle NFSv4 error %d\n", 191 __func__, -err); 192 break; 193 } 194 return -EIO; 195 } 196 197 /* 198 * This is our standard bitmap for GETATTR requests. 199 */ 200 const u32 nfs4_fattr_bitmap[3] = { 201 FATTR4_WORD0_TYPE 202 | FATTR4_WORD0_CHANGE 203 | FATTR4_WORD0_SIZE 204 | FATTR4_WORD0_FSID 205 | FATTR4_WORD0_FILEID, 206 FATTR4_WORD1_MODE 207 | FATTR4_WORD1_NUMLINKS 208 | FATTR4_WORD1_OWNER 209 | FATTR4_WORD1_OWNER_GROUP 210 | FATTR4_WORD1_RAWDEV 211 | FATTR4_WORD1_SPACE_USED 212 | FATTR4_WORD1_TIME_ACCESS 213 | FATTR4_WORD1_TIME_METADATA 214 | FATTR4_WORD1_TIME_MODIFY 215 | FATTR4_WORD1_MOUNTED_ON_FILEID, 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 217 FATTR4_WORD2_SECURITY_LABEL 218 #endif 219 }; 220 221 static const u32 nfs4_pnfs_open_bitmap[3] = { 222 FATTR4_WORD0_TYPE 223 | FATTR4_WORD0_CHANGE 224 | FATTR4_WORD0_SIZE 225 | FATTR4_WORD0_FSID 226 | FATTR4_WORD0_FILEID, 227 FATTR4_WORD1_MODE 228 | FATTR4_WORD1_NUMLINKS 229 | FATTR4_WORD1_OWNER 230 | FATTR4_WORD1_OWNER_GROUP 231 | FATTR4_WORD1_RAWDEV 232 | FATTR4_WORD1_SPACE_USED 233 | FATTR4_WORD1_TIME_ACCESS 234 | FATTR4_WORD1_TIME_METADATA 235 | FATTR4_WORD1_TIME_MODIFY, 236 FATTR4_WORD2_MDSTHRESHOLD 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 238 | FATTR4_WORD2_SECURITY_LABEL 239 #endif 240 }; 241 242 static const u32 nfs4_open_noattr_bitmap[3] = { 243 FATTR4_WORD0_TYPE 244 | FATTR4_WORD0_FILEID, 245 }; 246 247 const u32 nfs4_statfs_bitmap[3] = { 248 FATTR4_WORD0_FILES_AVAIL 249 | FATTR4_WORD0_FILES_FREE 250 | FATTR4_WORD0_FILES_TOTAL, 251 FATTR4_WORD1_SPACE_AVAIL 252 | FATTR4_WORD1_SPACE_FREE 253 | FATTR4_WORD1_SPACE_TOTAL 254 }; 255 256 const u32 nfs4_pathconf_bitmap[3] = { 257 FATTR4_WORD0_MAXLINK 258 | FATTR4_WORD0_MAXNAME, 259 0 260 }; 261 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 263 | FATTR4_WORD0_MAXREAD 264 | FATTR4_WORD0_MAXWRITE 265 | FATTR4_WORD0_LEASE_TIME, 266 FATTR4_WORD1_TIME_DELTA 267 | FATTR4_WORD1_FS_LAYOUT_TYPES, 268 FATTR4_WORD2_LAYOUT_BLKSIZE 269 | FATTR4_WORD2_CLONE_BLKSIZE 270 | FATTR4_WORD2_CHANGE_ATTR_TYPE 271 | FATTR4_WORD2_XATTR_SUPPORT 272 }; 273 274 const u32 nfs4_fs_locations_bitmap[3] = { 275 FATTR4_WORD0_CHANGE 276 | FATTR4_WORD0_SIZE 277 | FATTR4_WORD0_FSID 278 | FATTR4_WORD0_FILEID 279 | FATTR4_WORD0_FS_LOCATIONS, 280 FATTR4_WORD1_OWNER 281 | FATTR4_WORD1_OWNER_GROUP 282 | FATTR4_WORD1_RAWDEV 283 | FATTR4_WORD1_SPACE_USED 284 | FATTR4_WORD1_TIME_ACCESS 285 | FATTR4_WORD1_TIME_METADATA 286 | FATTR4_WORD1_TIME_MODIFY 287 | FATTR4_WORD1_MOUNTED_ON_FILEID, 288 }; 289 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 291 struct inode *inode, unsigned long flags) 292 { 293 unsigned long cache_validity; 294 295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 296 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 297 return; 298 299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 300 301 /* Remove the attributes over which we have full control */ 302 dst[1] &= ~FATTR4_WORD1_RAWDEV; 303 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 304 dst[0] &= ~FATTR4_WORD0_SIZE; 305 306 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 307 dst[0] &= ~FATTR4_WORD0_CHANGE; 308 309 if (!(cache_validity & NFS_INO_INVALID_MODE)) 310 dst[1] &= ~FATTR4_WORD1_MODE; 311 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 313 } 314 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 316 struct nfs4_readdir_arg *readdir) 317 { 318 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 319 __be32 *start, *p; 320 321 if (cookie > 2) { 322 readdir->cookie = cookie; 323 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 324 return; 325 } 326 327 readdir->cookie = 0; 328 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 329 if (cookie == 2) 330 return; 331 332 /* 333 * NFSv4 servers do not return entries for '.' and '..' 334 * Therefore, we fake these entries here. We let '.' 335 * have cookie 0 and '..' have cookie 1. Note that 336 * when talking to the server, we always send cookie 0 337 * instead of 1 or 2. 338 */ 339 start = p = kmap_atomic(*readdir->pages); 340 341 if (cookie == 0) { 342 *p++ = xdr_one; /* next */ 343 *p++ = xdr_zero; /* cookie, first word */ 344 *p++ = xdr_one; /* cookie, second word */ 345 *p++ = xdr_one; /* entry len */ 346 memcpy(p, ".\0\0\0", 4); /* entry */ 347 p++; 348 *p++ = xdr_one; /* bitmap length */ 349 *p++ = htonl(attrs); /* bitmap */ 350 *p++ = htonl(12); /* attribute buffer length */ 351 *p++ = htonl(NF4DIR); 352 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 353 } 354 355 *p++ = xdr_one; /* next */ 356 *p++ = xdr_zero; /* cookie, first word */ 357 *p++ = xdr_two; /* cookie, second word */ 358 *p++ = xdr_two; /* entry len */ 359 memcpy(p, "..\0\0", 4); /* entry */ 360 p++; 361 *p++ = xdr_one; /* bitmap length */ 362 *p++ = htonl(attrs); /* bitmap */ 363 *p++ = htonl(12); /* attribute buffer length */ 364 *p++ = htonl(NF4DIR); 365 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 366 367 readdir->pgbase = (char *)p - (char *)start; 368 readdir->count -= readdir->pgbase; 369 kunmap_atomic(start); 370 } 371 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 373 { 374 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 375 fattr->pre_change_attr = version; 376 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 377 } 378 } 379 380 static void nfs4_test_and_free_stateid(struct nfs_server *server, 381 nfs4_stateid *stateid, 382 const struct cred *cred) 383 { 384 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 385 386 ops->test_and_free_expired(server, stateid, cred); 387 } 388 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 390 nfs4_stateid *stateid, 391 const struct cred *cred) 392 { 393 stateid->type = NFS4_REVOKED_STATEID_TYPE; 394 nfs4_test_and_free_stateid(server, stateid, cred); 395 } 396 397 static void nfs4_free_revoked_stateid(struct nfs_server *server, 398 const nfs4_stateid *stateid, 399 const struct cred *cred) 400 { 401 nfs4_stateid tmp; 402 403 nfs4_stateid_copy(&tmp, stateid); 404 __nfs4_free_revoked_stateid(server, &tmp, cred); 405 } 406 407 static long nfs4_update_delay(long *timeout) 408 { 409 long ret; 410 if (!timeout) 411 return NFS4_POLL_RETRY_MAX; 412 if (*timeout <= 0) 413 *timeout = NFS4_POLL_RETRY_MIN; 414 if (*timeout > NFS4_POLL_RETRY_MAX) 415 *timeout = NFS4_POLL_RETRY_MAX; 416 ret = *timeout; 417 *timeout <<= 1; 418 return ret; 419 } 420 421 static int nfs4_delay_killable(long *timeout) 422 { 423 might_sleep(); 424 425 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 426 schedule_timeout(nfs4_update_delay(timeout)); 427 if (!__fatal_signal_pending(current)) 428 return 0; 429 return -EINTR; 430 } 431 432 static int nfs4_delay_interruptible(long *timeout) 433 { 434 might_sleep(); 435 436 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 437 schedule_timeout(nfs4_update_delay(timeout)); 438 if (!signal_pending(current)) 439 return 0; 440 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 441 } 442 443 static int nfs4_delay(long *timeout, bool interruptible) 444 { 445 if (interruptible) 446 return nfs4_delay_interruptible(timeout); 447 return nfs4_delay_killable(timeout); 448 } 449 450 static const nfs4_stateid * 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 452 { 453 if (!stateid) 454 return NULL; 455 switch (stateid->type) { 456 case NFS4_OPEN_STATEID_TYPE: 457 case NFS4_LOCK_STATEID_TYPE: 458 case NFS4_DELEGATION_STATEID_TYPE: 459 return stateid; 460 default: 461 break; 462 } 463 return NULL; 464 } 465 466 /* This is the error handling routine for processes that are allowed 467 * to sleep. 468 */ 469 static int nfs4_do_handle_exception(struct nfs_server *server, 470 int errorcode, struct nfs4_exception *exception) 471 { 472 struct nfs_client *clp = server->nfs_client; 473 struct nfs4_state *state = exception->state; 474 const nfs4_stateid *stateid; 475 struct inode *inode = exception->inode; 476 int ret = errorcode; 477 478 exception->delay = 0; 479 exception->recovering = 0; 480 exception->retry = 0; 481 482 stateid = nfs4_recoverable_stateid(exception->stateid); 483 if (stateid == NULL && state != NULL) 484 stateid = nfs4_recoverable_stateid(&state->stateid); 485 486 switch(errorcode) { 487 case 0: 488 return 0; 489 case -NFS4ERR_BADHANDLE: 490 case -ESTALE: 491 if (inode != NULL && S_ISREG(inode->i_mode)) 492 pnfs_destroy_layout(NFS_I(inode)); 493 break; 494 case -NFS4ERR_DELEG_REVOKED: 495 case -NFS4ERR_ADMIN_REVOKED: 496 case -NFS4ERR_EXPIRED: 497 case -NFS4ERR_BAD_STATEID: 498 case -NFS4ERR_PARTNER_NO_AUTH: 499 if (inode != NULL && stateid != NULL) { 500 nfs_inode_find_state_and_recover(inode, 501 stateid); 502 goto wait_on_recovery; 503 } 504 fallthrough; 505 case -NFS4ERR_OPENMODE: 506 if (inode) { 507 int err; 508 509 err = nfs_async_inode_return_delegation(inode, 510 stateid); 511 if (err == 0) 512 goto wait_on_recovery; 513 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 514 exception->retry = 1; 515 break; 516 } 517 } 518 if (state == NULL) 519 break; 520 ret = nfs4_schedule_stateid_recovery(server, state); 521 if (ret < 0) 522 break; 523 goto wait_on_recovery; 524 case -NFS4ERR_STALE_STATEID: 525 case -NFS4ERR_STALE_CLIENTID: 526 nfs4_schedule_lease_recovery(clp); 527 goto wait_on_recovery; 528 case -NFS4ERR_MOVED: 529 ret = nfs4_schedule_migration_recovery(server); 530 if (ret < 0) 531 break; 532 goto wait_on_recovery; 533 case -NFS4ERR_LEASE_MOVED: 534 nfs4_schedule_lease_moved_recovery(clp); 535 goto wait_on_recovery; 536 #if defined(CONFIG_NFS_V4_1) 537 case -NFS4ERR_BADSESSION: 538 case -NFS4ERR_BADSLOT: 539 case -NFS4ERR_BAD_HIGH_SLOT: 540 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 541 case -NFS4ERR_DEADSESSION: 542 case -NFS4ERR_SEQ_FALSE_RETRY: 543 case -NFS4ERR_SEQ_MISORDERED: 544 /* Handled in nfs41_sequence_process() */ 545 goto wait_on_recovery; 546 #endif /* defined(CONFIG_NFS_V4_1) */ 547 case -NFS4ERR_FILE_OPEN: 548 if (exception->timeout > HZ) { 549 /* We have retried a decent amount, time to 550 * fail 551 */ 552 ret = -EBUSY; 553 break; 554 } 555 fallthrough; 556 case -NFS4ERR_DELAY: 557 nfs_inc_server_stats(server, NFSIOS_DELAY); 558 fallthrough; 559 case -NFS4ERR_GRACE: 560 case -NFS4ERR_LAYOUTTRYLATER: 561 case -NFS4ERR_RECALLCONFLICT: 562 case -NFS4ERR_RETURNCONFLICT: 563 exception->delay = 1; 564 return 0; 565 566 case -NFS4ERR_RETRY_UNCACHED_REP: 567 case -NFS4ERR_OLD_STATEID: 568 exception->retry = 1; 569 break; 570 case -NFS4ERR_BADOWNER: 571 /* The following works around a Linux server bug! */ 572 case -NFS4ERR_BADNAME: 573 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 574 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 575 exception->retry = 1; 576 printk(KERN_WARNING "NFS: v4 server %s " 577 "does not accept raw " 578 "uid/gids. " 579 "Reenabling the idmapper.\n", 580 server->nfs_client->cl_hostname); 581 } 582 } 583 /* We failed to handle the error */ 584 return nfs4_map_errors(ret); 585 wait_on_recovery: 586 exception->recovering = 1; 587 return 0; 588 } 589 590 /* 591 * Track the number of NFS4ERR_DELAY related retransmissions and return 592 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit 593 * set by 'nfs_delay_retrans'. 594 */ 595 static int nfs4_exception_should_retrans(const struct nfs_server *server, 596 struct nfs4_exception *exception) 597 { 598 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) { 599 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans) 600 return -EAGAIN; 601 } 602 return 0; 603 } 604 605 /* This is the error handling routine for processes that are allowed 606 * to sleep. 607 */ 608 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 609 { 610 struct nfs_client *clp = server->nfs_client; 611 int ret; 612 613 ret = nfs4_do_handle_exception(server, errorcode, exception); 614 if (exception->delay) { 615 int ret2 = nfs4_exception_should_retrans(server, exception); 616 if (ret2 < 0) { 617 exception->retry = 0; 618 return ret2; 619 } 620 ret = nfs4_delay(&exception->timeout, 621 exception->interruptible); 622 goto out_retry; 623 } 624 if (exception->recovering) { 625 if (exception->task_is_privileged) 626 return -EDEADLOCK; 627 ret = nfs4_wait_clnt_recover(clp); 628 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 629 return -EIO; 630 goto out_retry; 631 } 632 return ret; 633 out_retry: 634 if (ret == 0) 635 exception->retry = 1; 636 return ret; 637 } 638 639 static int 640 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 641 int errorcode, struct nfs4_exception *exception) 642 { 643 struct nfs_client *clp = server->nfs_client; 644 int ret; 645 646 ret = nfs4_do_handle_exception(server, errorcode, exception); 647 if (exception->delay) { 648 int ret2 = nfs4_exception_should_retrans(server, exception); 649 if (ret2 < 0) { 650 exception->retry = 0; 651 return ret2; 652 } 653 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 654 goto out_retry; 655 } 656 if (exception->recovering) { 657 if (exception->task_is_privileged) 658 return -EDEADLOCK; 659 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 660 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 661 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 662 goto out_retry; 663 } 664 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 665 ret = -EIO; 666 return ret; 667 out_retry: 668 if (ret == 0) { 669 exception->retry = 1; 670 /* 671 * For NFS4ERR_MOVED, the client transport will need to 672 * be recomputed after migration recovery has completed. 673 */ 674 if (errorcode == -NFS4ERR_MOVED) 675 rpc_task_release_transport(task); 676 } 677 return ret; 678 } 679 680 int 681 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 682 struct nfs4_state *state, long *timeout) 683 { 684 struct nfs4_exception exception = { 685 .state = state, 686 }; 687 688 if (task->tk_status >= 0) 689 return 0; 690 if (timeout) 691 exception.timeout = *timeout; 692 task->tk_status = nfs4_async_handle_exception(task, server, 693 task->tk_status, 694 &exception); 695 if (exception.delay && timeout) 696 *timeout = exception.timeout; 697 if (exception.retry) 698 return -EAGAIN; 699 return 0; 700 } 701 702 /* 703 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 704 * or 'false' otherwise. 705 */ 706 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 707 { 708 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 709 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 710 } 711 712 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 713 { 714 spin_lock(&clp->cl_lock); 715 if (time_before(clp->cl_last_renewal,timestamp)) 716 clp->cl_last_renewal = timestamp; 717 spin_unlock(&clp->cl_lock); 718 } 719 720 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 721 { 722 struct nfs_client *clp = server->nfs_client; 723 724 if (!nfs4_has_session(clp)) 725 do_renew_lease(clp, timestamp); 726 } 727 728 struct nfs4_call_sync_data { 729 const struct nfs_server *seq_server; 730 struct nfs4_sequence_args *seq_args; 731 struct nfs4_sequence_res *seq_res; 732 }; 733 734 void nfs4_init_sequence(struct nfs4_sequence_args *args, 735 struct nfs4_sequence_res *res, int cache_reply, 736 int privileged) 737 { 738 args->sa_slot = NULL; 739 args->sa_cache_this = cache_reply; 740 args->sa_privileged = privileged; 741 742 res->sr_slot = NULL; 743 } 744 745 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 746 { 747 struct nfs4_slot *slot = res->sr_slot; 748 struct nfs4_slot_table *tbl; 749 750 tbl = slot->table; 751 spin_lock(&tbl->slot_tbl_lock); 752 if (!nfs41_wake_and_assign_slot(tbl, slot)) 753 nfs4_free_slot(tbl, slot); 754 spin_unlock(&tbl->slot_tbl_lock); 755 756 res->sr_slot = NULL; 757 } 758 759 static int nfs40_sequence_done(struct rpc_task *task, 760 struct nfs4_sequence_res *res) 761 { 762 if (res->sr_slot != NULL) 763 nfs40_sequence_free_slot(res); 764 return 1; 765 } 766 767 #if defined(CONFIG_NFS_V4_1) 768 769 static void nfs41_release_slot(struct nfs4_slot *slot) 770 { 771 struct nfs4_session *session; 772 struct nfs4_slot_table *tbl; 773 bool send_new_highest_used_slotid = false; 774 775 if (!slot) 776 return; 777 tbl = slot->table; 778 session = tbl->session; 779 780 /* Bump the slot sequence number */ 781 if (slot->seq_done) 782 slot->seq_nr++; 783 slot->seq_done = 0; 784 785 spin_lock(&tbl->slot_tbl_lock); 786 /* Be nice to the server: try to ensure that the last transmitted 787 * value for highest_user_slotid <= target_highest_slotid 788 */ 789 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 790 send_new_highest_used_slotid = true; 791 792 if (nfs41_wake_and_assign_slot(tbl, slot)) { 793 send_new_highest_used_slotid = false; 794 goto out_unlock; 795 } 796 nfs4_free_slot(tbl, slot); 797 798 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 799 send_new_highest_used_slotid = false; 800 out_unlock: 801 spin_unlock(&tbl->slot_tbl_lock); 802 if (send_new_highest_used_slotid) 803 nfs41_notify_server(session->clp); 804 if (waitqueue_active(&tbl->slot_waitq)) 805 wake_up_all(&tbl->slot_waitq); 806 } 807 808 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 809 { 810 nfs41_release_slot(res->sr_slot); 811 res->sr_slot = NULL; 812 } 813 814 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 815 u32 seqnr) 816 { 817 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 818 slot->seq_nr_highest_sent = seqnr; 819 } 820 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 821 { 822 nfs4_slot_sequence_record_sent(slot, seqnr); 823 slot->seq_nr_last_acked = seqnr; 824 } 825 826 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 827 struct nfs4_slot *slot) 828 { 829 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 830 if (!IS_ERR(task)) 831 rpc_put_task_async(task); 832 } 833 834 static int nfs41_sequence_process(struct rpc_task *task, 835 struct nfs4_sequence_res *res) 836 { 837 struct nfs4_session *session; 838 struct nfs4_slot *slot = res->sr_slot; 839 struct nfs_client *clp; 840 int status; 841 int ret = 1; 842 843 if (slot == NULL) 844 goto out_noaction; 845 /* don't increment the sequence number if the task wasn't sent */ 846 if (!RPC_WAS_SENT(task) || slot->seq_done) 847 goto out; 848 849 session = slot->table->session; 850 clp = session->clp; 851 852 trace_nfs4_sequence_done(session, res); 853 854 status = res->sr_status; 855 if (task->tk_status == -NFS4ERR_DEADSESSION) 856 status = -NFS4ERR_DEADSESSION; 857 858 /* Check the SEQUENCE operation status */ 859 switch (status) { 860 case 0: 861 /* Mark this sequence number as having been acked */ 862 nfs4_slot_sequence_acked(slot, slot->seq_nr); 863 /* Update the slot's sequence and clientid lease timer */ 864 slot->seq_done = 1; 865 do_renew_lease(clp, res->sr_timestamp); 866 /* Check sequence flags */ 867 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 868 !!slot->privileged); 869 nfs41_update_target_slotid(slot->table, slot, res); 870 break; 871 case 1: 872 /* 873 * sr_status remains 1 if an RPC level error occurred. 874 * The server may or may not have processed the sequence 875 * operation.. 876 */ 877 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 878 slot->seq_done = 1; 879 goto out; 880 case -NFS4ERR_DELAY: 881 /* The server detected a resend of the RPC call and 882 * returned NFS4ERR_DELAY as per Section 2.10.6.2 883 * of RFC5661. 884 */ 885 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 886 __func__, 887 slot->slot_nr, 888 slot->seq_nr); 889 goto out_retry; 890 case -NFS4ERR_RETRY_UNCACHED_REP: 891 case -NFS4ERR_SEQ_FALSE_RETRY: 892 /* 893 * The server thinks we tried to replay a request. 894 * Retry the call after bumping the sequence ID. 895 */ 896 nfs4_slot_sequence_acked(slot, slot->seq_nr); 897 goto retry_new_seq; 898 case -NFS4ERR_BADSLOT: 899 /* 900 * The slot id we used was probably retired. Try again 901 * using a different slot id. 902 */ 903 if (slot->slot_nr < slot->table->target_highest_slotid) 904 goto session_recover; 905 goto retry_nowait; 906 case -NFS4ERR_SEQ_MISORDERED: 907 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 908 /* 909 * Were one or more calls using this slot interrupted? 910 * If the server never received the request, then our 911 * transmitted slot sequence number may be too high. However, 912 * if the server did receive the request then it might 913 * accidentally give us a reply with a mismatched operation. 914 * We can sort this out by sending a lone sequence operation 915 * to the server on the same slot. 916 */ 917 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 918 slot->seq_nr--; 919 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 920 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 921 res->sr_slot = NULL; 922 } 923 goto retry_nowait; 924 } 925 /* 926 * RFC5661: 927 * A retry might be sent while the original request is 928 * still in progress on the replier. The replier SHOULD 929 * deal with the issue by returning NFS4ERR_DELAY as the 930 * reply to SEQUENCE or CB_SEQUENCE operation, but 931 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 932 * 933 * Restart the search after a delay. 934 */ 935 slot->seq_nr = slot->seq_nr_highest_sent; 936 goto out_retry; 937 case -NFS4ERR_BADSESSION: 938 case -NFS4ERR_DEADSESSION: 939 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 940 goto session_recover; 941 default: 942 /* Just update the slot sequence no. */ 943 slot->seq_done = 1; 944 } 945 out: 946 /* The session may be reset by one of the error handlers. */ 947 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 948 out_noaction: 949 return ret; 950 session_recover: 951 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state); 952 nfs4_schedule_session_recovery(session, status); 953 dprintk("%s ERROR: %d Reset session\n", __func__, status); 954 nfs41_sequence_free_slot(res); 955 goto out; 956 retry_new_seq: 957 ++slot->seq_nr; 958 retry_nowait: 959 if (rpc_restart_call_prepare(task)) { 960 nfs41_sequence_free_slot(res); 961 task->tk_status = 0; 962 ret = 0; 963 } 964 goto out; 965 out_retry: 966 if (!rpc_restart_call(task)) 967 goto out; 968 rpc_delay(task, NFS4_POLL_RETRY_MAX); 969 return 0; 970 } 971 972 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 973 { 974 if (!nfs41_sequence_process(task, res)) 975 return 0; 976 if (res->sr_slot != NULL) 977 nfs41_sequence_free_slot(res); 978 return 1; 979 980 } 981 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 982 983 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 984 { 985 if (res->sr_slot == NULL) 986 return 1; 987 if (res->sr_slot->table->session != NULL) 988 return nfs41_sequence_process(task, res); 989 return nfs40_sequence_done(task, res); 990 } 991 992 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 993 { 994 if (res->sr_slot != NULL) { 995 if (res->sr_slot->table->session != NULL) 996 nfs41_sequence_free_slot(res); 997 else 998 nfs40_sequence_free_slot(res); 999 } 1000 } 1001 1002 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 1003 { 1004 if (res->sr_slot == NULL) 1005 return 1; 1006 if (!res->sr_slot->table->session) 1007 return nfs40_sequence_done(task, res); 1008 return nfs41_sequence_done(task, res); 1009 } 1010 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1011 1012 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 1013 { 1014 struct nfs4_call_sync_data *data = calldata; 1015 1016 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 1017 1018 nfs4_setup_sequence(data->seq_server->nfs_client, 1019 data->seq_args, data->seq_res, task); 1020 } 1021 1022 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 1023 { 1024 struct nfs4_call_sync_data *data = calldata; 1025 1026 nfs41_sequence_done(task, data->seq_res); 1027 } 1028 1029 static const struct rpc_call_ops nfs41_call_sync_ops = { 1030 .rpc_call_prepare = nfs41_call_sync_prepare, 1031 .rpc_call_done = nfs41_call_sync_done, 1032 }; 1033 1034 #else /* !CONFIG_NFS_V4_1 */ 1035 1036 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1037 { 1038 return nfs40_sequence_done(task, res); 1039 } 1040 1041 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1042 { 1043 if (res->sr_slot != NULL) 1044 nfs40_sequence_free_slot(res); 1045 } 1046 1047 int nfs4_sequence_done(struct rpc_task *task, 1048 struct nfs4_sequence_res *res) 1049 { 1050 return nfs40_sequence_done(task, res); 1051 } 1052 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1053 1054 #endif /* !CONFIG_NFS_V4_1 */ 1055 1056 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1057 { 1058 res->sr_timestamp = jiffies; 1059 res->sr_status_flags = 0; 1060 res->sr_status = 1; 1061 } 1062 1063 static 1064 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1065 struct nfs4_sequence_res *res, 1066 struct nfs4_slot *slot) 1067 { 1068 if (!slot) 1069 return; 1070 slot->privileged = args->sa_privileged ? 1 : 0; 1071 args->sa_slot = slot; 1072 1073 res->sr_slot = slot; 1074 } 1075 1076 int nfs4_setup_sequence(struct nfs_client *client, 1077 struct nfs4_sequence_args *args, 1078 struct nfs4_sequence_res *res, 1079 struct rpc_task *task) 1080 { 1081 struct nfs4_session *session = nfs4_get_session(client); 1082 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1083 struct nfs4_slot *slot; 1084 1085 /* slot already allocated? */ 1086 if (res->sr_slot != NULL) 1087 goto out_start; 1088 1089 if (session) 1090 tbl = &session->fc_slot_table; 1091 1092 spin_lock(&tbl->slot_tbl_lock); 1093 /* The state manager will wait until the slot table is empty */ 1094 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1095 goto out_sleep; 1096 1097 slot = nfs4_alloc_slot(tbl); 1098 if (IS_ERR(slot)) { 1099 if (slot == ERR_PTR(-ENOMEM)) 1100 goto out_sleep_timeout; 1101 goto out_sleep; 1102 } 1103 spin_unlock(&tbl->slot_tbl_lock); 1104 1105 nfs4_sequence_attach_slot(args, res, slot); 1106 1107 trace_nfs4_setup_sequence(session, args); 1108 out_start: 1109 nfs41_sequence_res_init(res); 1110 rpc_call_start(task); 1111 return 0; 1112 out_sleep_timeout: 1113 /* Try again in 1/4 second */ 1114 if (args->sa_privileged) 1115 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1116 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1117 else 1118 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1119 NULL, jiffies + (HZ >> 2)); 1120 spin_unlock(&tbl->slot_tbl_lock); 1121 return -EAGAIN; 1122 out_sleep: 1123 if (args->sa_privileged) 1124 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1125 RPC_PRIORITY_PRIVILEGED); 1126 else 1127 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1128 spin_unlock(&tbl->slot_tbl_lock); 1129 return -EAGAIN; 1130 } 1131 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1132 1133 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1134 { 1135 struct nfs4_call_sync_data *data = calldata; 1136 nfs4_setup_sequence(data->seq_server->nfs_client, 1137 data->seq_args, data->seq_res, task); 1138 } 1139 1140 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1141 { 1142 struct nfs4_call_sync_data *data = calldata; 1143 nfs4_sequence_done(task, data->seq_res); 1144 } 1145 1146 static const struct rpc_call_ops nfs40_call_sync_ops = { 1147 .rpc_call_prepare = nfs40_call_sync_prepare, 1148 .rpc_call_done = nfs40_call_sync_done, 1149 }; 1150 1151 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1152 { 1153 int ret; 1154 struct rpc_task *task; 1155 1156 task = rpc_run_task(task_setup); 1157 if (IS_ERR(task)) 1158 return PTR_ERR(task); 1159 1160 ret = task->tk_status; 1161 rpc_put_task(task); 1162 return ret; 1163 } 1164 1165 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1166 struct nfs_server *server, 1167 struct rpc_message *msg, 1168 struct nfs4_sequence_args *args, 1169 struct nfs4_sequence_res *res, 1170 unsigned short task_flags) 1171 { 1172 struct nfs_client *clp = server->nfs_client; 1173 struct nfs4_call_sync_data data = { 1174 .seq_server = server, 1175 .seq_args = args, 1176 .seq_res = res, 1177 }; 1178 struct rpc_task_setup task_setup = { 1179 .rpc_client = clnt, 1180 .rpc_message = msg, 1181 .callback_ops = clp->cl_mvops->call_sync_ops, 1182 .callback_data = &data, 1183 .flags = task_flags, 1184 }; 1185 1186 return nfs4_call_sync_custom(&task_setup); 1187 } 1188 1189 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1190 struct nfs_server *server, 1191 struct rpc_message *msg, 1192 struct nfs4_sequence_args *args, 1193 struct nfs4_sequence_res *res) 1194 { 1195 unsigned short task_flags = 0; 1196 1197 if (server->caps & NFS_CAP_MOVEABLE) 1198 task_flags = RPC_TASK_MOVEABLE; 1199 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1200 } 1201 1202 1203 int nfs4_call_sync(struct rpc_clnt *clnt, 1204 struct nfs_server *server, 1205 struct rpc_message *msg, 1206 struct nfs4_sequence_args *args, 1207 struct nfs4_sequence_res *res, 1208 int cache_reply) 1209 { 1210 nfs4_init_sequence(args, res, cache_reply, 0); 1211 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1212 } 1213 1214 static void 1215 nfs4_inc_nlink_locked(struct inode *inode) 1216 { 1217 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1218 NFS_INO_INVALID_CTIME | 1219 NFS_INO_INVALID_NLINK); 1220 inc_nlink(inode); 1221 } 1222 1223 static void 1224 nfs4_inc_nlink(struct inode *inode) 1225 { 1226 spin_lock(&inode->i_lock); 1227 nfs4_inc_nlink_locked(inode); 1228 spin_unlock(&inode->i_lock); 1229 } 1230 1231 static void 1232 nfs4_dec_nlink_locked(struct inode *inode) 1233 { 1234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1235 NFS_INO_INVALID_CTIME | 1236 NFS_INO_INVALID_NLINK); 1237 drop_nlink(inode); 1238 } 1239 1240 static void 1241 nfs4_update_changeattr_locked(struct inode *inode, 1242 struct nfs4_change_info *cinfo, 1243 unsigned long timestamp, unsigned long cache_validity) 1244 { 1245 struct nfs_inode *nfsi = NFS_I(inode); 1246 u64 change_attr = inode_peek_iversion_raw(inode); 1247 1248 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1249 if (S_ISDIR(inode->i_mode)) 1250 cache_validity |= NFS_INO_INVALID_DATA; 1251 1252 switch (NFS_SERVER(inode)->change_attr_type) { 1253 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1254 if (cinfo->after == change_attr) 1255 goto out; 1256 break; 1257 default: 1258 if ((s64)(change_attr - cinfo->after) >= 0) 1259 goto out; 1260 } 1261 1262 inode_set_iversion_raw(inode, cinfo->after); 1263 if (!cinfo->atomic || cinfo->before != change_attr) { 1264 if (S_ISDIR(inode->i_mode)) 1265 nfs_force_lookup_revalidate(inode); 1266 1267 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1268 cache_validity |= 1269 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1270 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1271 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1272 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1273 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1274 } 1275 nfsi->attrtimeo_timestamp = jiffies; 1276 nfsi->read_cache_jiffies = timestamp; 1277 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1278 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1279 out: 1280 nfs_set_cache_invalid(inode, cache_validity); 1281 } 1282 1283 void 1284 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1285 unsigned long timestamp, unsigned long cache_validity) 1286 { 1287 spin_lock(&dir->i_lock); 1288 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1289 spin_unlock(&dir->i_lock); 1290 } 1291 1292 struct nfs4_open_createattrs { 1293 struct nfs4_label *label; 1294 struct iattr *sattr; 1295 const __u32 verf[2]; 1296 }; 1297 1298 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1299 int err, struct nfs4_exception *exception) 1300 { 1301 if (err != -EINVAL) 1302 return false; 1303 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1304 return false; 1305 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1306 exception->retry = 1; 1307 return true; 1308 } 1309 1310 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1311 { 1312 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1313 } 1314 1315 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1316 { 1317 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1318 1319 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1320 } 1321 1322 static u32 1323 nfs4_map_atomic_open_share(struct nfs_server *server, 1324 fmode_t fmode, int openflags) 1325 { 1326 u32 res = 0; 1327 1328 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1329 case FMODE_READ: 1330 res = NFS4_SHARE_ACCESS_READ; 1331 break; 1332 case FMODE_WRITE: 1333 res = NFS4_SHARE_ACCESS_WRITE; 1334 break; 1335 case FMODE_READ|FMODE_WRITE: 1336 res = NFS4_SHARE_ACCESS_BOTH; 1337 } 1338 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1339 goto out; 1340 /* Want no delegation if we're using O_DIRECT */ 1341 if (openflags & O_DIRECT) 1342 res |= NFS4_SHARE_WANT_NO_DELEG; 1343 out: 1344 return res; 1345 } 1346 1347 static enum open_claim_type4 1348 nfs4_map_atomic_open_claim(struct nfs_server *server, 1349 enum open_claim_type4 claim) 1350 { 1351 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1352 return claim; 1353 switch (claim) { 1354 default: 1355 return claim; 1356 case NFS4_OPEN_CLAIM_FH: 1357 return NFS4_OPEN_CLAIM_NULL; 1358 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1359 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1360 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1361 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1362 } 1363 } 1364 1365 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1366 { 1367 p->o_res.f_attr = &p->f_attr; 1368 p->o_res.seqid = p->o_arg.seqid; 1369 p->c_res.seqid = p->c_arg.seqid; 1370 p->o_res.server = p->o_arg.server; 1371 p->o_res.access_request = p->o_arg.access; 1372 nfs_fattr_init(&p->f_attr); 1373 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1374 } 1375 1376 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1377 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1378 const struct nfs4_open_createattrs *c, 1379 enum open_claim_type4 claim, 1380 gfp_t gfp_mask) 1381 { 1382 struct dentry *parent = dget_parent(dentry); 1383 struct inode *dir = d_inode(parent); 1384 struct nfs_server *server = NFS_SERVER(dir); 1385 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1386 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1387 struct nfs4_opendata *p; 1388 1389 p = kzalloc(sizeof(*p), gfp_mask); 1390 if (p == NULL) 1391 goto err; 1392 1393 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1394 if (IS_ERR(p->f_attr.label)) 1395 goto err_free_p; 1396 1397 p->a_label = nfs4_label_alloc(server, gfp_mask); 1398 if (IS_ERR(p->a_label)) 1399 goto err_free_f; 1400 1401 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1402 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1403 if (IS_ERR(p->o_arg.seqid)) 1404 goto err_free_label; 1405 nfs_sb_active(dentry->d_sb); 1406 p->dentry = dget(dentry); 1407 p->dir = parent; 1408 p->owner = sp; 1409 atomic_inc(&sp->so_count); 1410 p->o_arg.open_flags = flags; 1411 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1412 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1413 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1414 fmode, flags); 1415 if (flags & O_CREAT) { 1416 p->o_arg.umask = current_umask(); 1417 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1418 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1419 p->o_arg.u.attrs = &p->attrs; 1420 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1421 1422 memcpy(p->o_arg.u.verifier.data, c->verf, 1423 sizeof(p->o_arg.u.verifier.data)); 1424 } 1425 } 1426 /* ask server to check for all possible rights as results 1427 * are cached */ 1428 switch (p->o_arg.claim) { 1429 default: 1430 break; 1431 case NFS4_OPEN_CLAIM_NULL: 1432 case NFS4_OPEN_CLAIM_FH: 1433 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1434 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1435 NFS4_ACCESS_EXECUTE | 1436 nfs_access_xattr_mask(server); 1437 } 1438 p->o_arg.clientid = server->nfs_client->cl_clientid; 1439 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1440 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1441 p->o_arg.name = &dentry->d_name; 1442 p->o_arg.server = server; 1443 p->o_arg.bitmask = nfs4_bitmask(server, label); 1444 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1445 switch (p->o_arg.claim) { 1446 case NFS4_OPEN_CLAIM_NULL: 1447 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1448 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1449 p->o_arg.fh = NFS_FH(dir); 1450 break; 1451 case NFS4_OPEN_CLAIM_PREVIOUS: 1452 case NFS4_OPEN_CLAIM_FH: 1453 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1454 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1455 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1456 } 1457 p->c_arg.fh = &p->o_res.fh; 1458 p->c_arg.stateid = &p->o_res.stateid; 1459 p->c_arg.seqid = p->o_arg.seqid; 1460 nfs4_init_opendata_res(p); 1461 kref_init(&p->kref); 1462 return p; 1463 1464 err_free_label: 1465 nfs4_label_free(p->a_label); 1466 err_free_f: 1467 nfs4_label_free(p->f_attr.label); 1468 err_free_p: 1469 kfree(p); 1470 err: 1471 dput(parent); 1472 return NULL; 1473 } 1474 1475 static void nfs4_opendata_free(struct kref *kref) 1476 { 1477 struct nfs4_opendata *p = container_of(kref, 1478 struct nfs4_opendata, kref); 1479 struct super_block *sb = p->dentry->d_sb; 1480 1481 nfs4_lgopen_release(p->lgp); 1482 nfs_free_seqid(p->o_arg.seqid); 1483 nfs4_sequence_free_slot(&p->o_res.seq_res); 1484 if (p->state != NULL) 1485 nfs4_put_open_state(p->state); 1486 nfs4_put_state_owner(p->owner); 1487 1488 nfs4_label_free(p->a_label); 1489 nfs4_label_free(p->f_attr.label); 1490 1491 dput(p->dir); 1492 dput(p->dentry); 1493 nfs_sb_deactive(sb); 1494 nfs_fattr_free_names(&p->f_attr); 1495 kfree(p->f_attr.mdsthreshold); 1496 kfree(p); 1497 } 1498 1499 static void nfs4_opendata_put(struct nfs4_opendata *p) 1500 { 1501 if (p != NULL) 1502 kref_put(&p->kref, nfs4_opendata_free); 1503 } 1504 1505 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1506 fmode_t fmode) 1507 { 1508 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1509 case FMODE_READ|FMODE_WRITE: 1510 return state->n_rdwr != 0; 1511 case FMODE_WRITE: 1512 return state->n_wronly != 0; 1513 case FMODE_READ: 1514 return state->n_rdonly != 0; 1515 } 1516 WARN_ON_ONCE(1); 1517 return false; 1518 } 1519 1520 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1521 int open_mode, enum open_claim_type4 claim) 1522 { 1523 int ret = 0; 1524 1525 if (open_mode & (O_EXCL|O_TRUNC)) 1526 goto out; 1527 switch (claim) { 1528 case NFS4_OPEN_CLAIM_NULL: 1529 case NFS4_OPEN_CLAIM_FH: 1530 goto out; 1531 default: 1532 break; 1533 } 1534 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1535 case FMODE_READ: 1536 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1537 && state->n_rdonly != 0; 1538 break; 1539 case FMODE_WRITE: 1540 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1541 && state->n_wronly != 0; 1542 break; 1543 case FMODE_READ|FMODE_WRITE: 1544 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1545 && state->n_rdwr != 0; 1546 } 1547 out: 1548 return ret; 1549 } 1550 1551 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1552 enum open_claim_type4 claim) 1553 { 1554 if (delegation == NULL) 1555 return 0; 1556 if ((delegation->type & fmode) != fmode) 1557 return 0; 1558 switch (claim) { 1559 case NFS4_OPEN_CLAIM_NULL: 1560 case NFS4_OPEN_CLAIM_FH: 1561 break; 1562 case NFS4_OPEN_CLAIM_PREVIOUS: 1563 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1564 break; 1565 fallthrough; 1566 default: 1567 return 0; 1568 } 1569 nfs_mark_delegation_referenced(delegation); 1570 return 1; 1571 } 1572 1573 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1574 { 1575 switch (fmode) { 1576 case FMODE_WRITE: 1577 state->n_wronly++; 1578 break; 1579 case FMODE_READ: 1580 state->n_rdonly++; 1581 break; 1582 case FMODE_READ|FMODE_WRITE: 1583 state->n_rdwr++; 1584 } 1585 nfs4_state_set_mode_locked(state, state->state | fmode); 1586 } 1587 1588 #ifdef CONFIG_NFS_V4_1 1589 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1590 { 1591 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1592 return true; 1593 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1594 return true; 1595 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1596 return true; 1597 return false; 1598 } 1599 #endif /* CONFIG_NFS_V4_1 */ 1600 1601 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1602 { 1603 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1604 wake_up_all(&state->waitq); 1605 } 1606 1607 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1608 { 1609 struct nfs_client *clp = state->owner->so_server->nfs_client; 1610 bool need_recover = false; 1611 1612 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1613 need_recover = true; 1614 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1615 need_recover = true; 1616 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1617 need_recover = true; 1618 if (need_recover) 1619 nfs4_state_mark_reclaim_nograce(clp, state); 1620 } 1621 1622 /* 1623 * Check for whether or not the caller may update the open stateid 1624 * to the value passed in by stateid. 1625 * 1626 * Note: This function relies heavily on the server implementing 1627 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1628 * correctly. 1629 * i.e. The stateid seqids have to be initialised to 1, and 1630 * are then incremented on every state transition. 1631 */ 1632 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1633 const nfs4_stateid *stateid) 1634 { 1635 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1636 /* The common case - we're updating to a new sequence number */ 1637 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1638 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1639 return true; 1640 return false; 1641 } 1642 /* The server returned a new stateid */ 1643 } 1644 /* This is the first OPEN in this generation */ 1645 if (stateid->seqid == cpu_to_be32(1)) 1646 return true; 1647 return false; 1648 } 1649 1650 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1651 { 1652 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1653 return; 1654 if (state->n_wronly) 1655 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1656 if (state->n_rdonly) 1657 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1658 if (state->n_rdwr) 1659 set_bit(NFS_O_RDWR_STATE, &state->flags); 1660 set_bit(NFS_OPEN_STATE, &state->flags); 1661 } 1662 1663 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1664 nfs4_stateid *stateid, fmode_t fmode) 1665 { 1666 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1667 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1668 case FMODE_WRITE: 1669 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1670 break; 1671 case FMODE_READ: 1672 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1673 break; 1674 case 0: 1675 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1676 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1677 clear_bit(NFS_OPEN_STATE, &state->flags); 1678 } 1679 if (stateid == NULL) 1680 return; 1681 /* Handle OPEN+OPEN_DOWNGRADE races */ 1682 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1683 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1684 nfs_resync_open_stateid_locked(state); 1685 goto out; 1686 } 1687 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1688 nfs4_stateid_copy(&state->stateid, stateid); 1689 nfs4_stateid_copy(&state->open_stateid, stateid); 1690 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1691 out: 1692 nfs_state_log_update_open_stateid(state); 1693 } 1694 1695 static void nfs_clear_open_stateid(struct nfs4_state *state, 1696 nfs4_stateid *arg_stateid, 1697 nfs4_stateid *stateid, fmode_t fmode) 1698 { 1699 write_seqlock(&state->seqlock); 1700 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1701 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1702 nfs_clear_open_stateid_locked(state, stateid, fmode); 1703 write_sequnlock(&state->seqlock); 1704 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1705 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1706 } 1707 1708 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1709 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1710 __must_hold(&state->owner->so_lock) 1711 __must_hold(&state->seqlock) 1712 __must_hold(RCU) 1713 1714 { 1715 DEFINE_WAIT(wait); 1716 int status = 0; 1717 for (;;) { 1718 1719 if (nfs_stateid_is_sequential(state, stateid)) 1720 break; 1721 1722 if (status) 1723 break; 1724 /* Rely on seqids for serialisation with NFSv4.0 */ 1725 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1726 break; 1727 1728 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1729 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1730 /* 1731 * Ensure we process the state changes in the same order 1732 * in which the server processed them by delaying the 1733 * update of the stateid until we are in sequence. 1734 */ 1735 write_sequnlock(&state->seqlock); 1736 spin_unlock(&state->owner->so_lock); 1737 rcu_read_unlock(); 1738 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1739 1740 if (!fatal_signal_pending(current)) { 1741 if (schedule_timeout(5*HZ) == 0) 1742 status = -EAGAIN; 1743 else 1744 status = 0; 1745 } else 1746 status = -EINTR; 1747 finish_wait(&state->waitq, &wait); 1748 rcu_read_lock(); 1749 spin_lock(&state->owner->so_lock); 1750 write_seqlock(&state->seqlock); 1751 } 1752 1753 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1754 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1755 nfs4_stateid_copy(freeme, &state->open_stateid); 1756 nfs_test_and_clear_all_open_stateid(state); 1757 } 1758 1759 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1760 nfs4_stateid_copy(&state->stateid, stateid); 1761 nfs4_stateid_copy(&state->open_stateid, stateid); 1762 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1763 nfs_state_log_update_open_stateid(state); 1764 } 1765 1766 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1767 const nfs4_stateid *open_stateid, 1768 fmode_t fmode, 1769 nfs4_stateid *freeme) 1770 { 1771 /* 1772 * Protect the call to nfs4_state_set_mode_locked and 1773 * serialise the stateid update 1774 */ 1775 write_seqlock(&state->seqlock); 1776 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1777 switch (fmode) { 1778 case FMODE_READ: 1779 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1780 break; 1781 case FMODE_WRITE: 1782 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1783 break; 1784 case FMODE_READ|FMODE_WRITE: 1785 set_bit(NFS_O_RDWR_STATE, &state->flags); 1786 } 1787 set_bit(NFS_OPEN_STATE, &state->flags); 1788 write_sequnlock(&state->seqlock); 1789 } 1790 1791 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1792 { 1793 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1794 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1795 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1796 clear_bit(NFS_OPEN_STATE, &state->flags); 1797 } 1798 1799 static void nfs_state_set_delegation(struct nfs4_state *state, 1800 const nfs4_stateid *deleg_stateid, 1801 fmode_t fmode) 1802 { 1803 /* 1804 * Protect the call to nfs4_state_set_mode_locked and 1805 * serialise the stateid update 1806 */ 1807 write_seqlock(&state->seqlock); 1808 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1809 set_bit(NFS_DELEGATED_STATE, &state->flags); 1810 write_sequnlock(&state->seqlock); 1811 } 1812 1813 static void nfs_state_clear_delegation(struct nfs4_state *state) 1814 { 1815 write_seqlock(&state->seqlock); 1816 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1817 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1818 write_sequnlock(&state->seqlock); 1819 } 1820 1821 int update_open_stateid(struct nfs4_state *state, 1822 const nfs4_stateid *open_stateid, 1823 const nfs4_stateid *delegation, 1824 fmode_t fmode) 1825 { 1826 struct nfs_server *server = NFS_SERVER(state->inode); 1827 struct nfs_client *clp = server->nfs_client; 1828 struct nfs_inode *nfsi = NFS_I(state->inode); 1829 struct nfs_delegation *deleg_cur; 1830 nfs4_stateid freeme = { }; 1831 int ret = 0; 1832 1833 fmode &= (FMODE_READ|FMODE_WRITE); 1834 1835 rcu_read_lock(); 1836 spin_lock(&state->owner->so_lock); 1837 if (open_stateid != NULL) { 1838 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1839 ret = 1; 1840 } 1841 1842 deleg_cur = nfs4_get_valid_delegation(state->inode); 1843 if (deleg_cur == NULL) 1844 goto no_delegation; 1845 1846 spin_lock(&deleg_cur->lock); 1847 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1848 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1849 (deleg_cur->type & fmode) != fmode) 1850 goto no_delegation_unlock; 1851 1852 if (delegation == NULL) 1853 delegation = &deleg_cur->stateid; 1854 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1855 goto no_delegation_unlock; 1856 1857 nfs_mark_delegation_referenced(deleg_cur); 1858 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1859 ret = 1; 1860 no_delegation_unlock: 1861 spin_unlock(&deleg_cur->lock); 1862 no_delegation: 1863 if (ret) 1864 update_open_stateflags(state, fmode); 1865 spin_unlock(&state->owner->so_lock); 1866 rcu_read_unlock(); 1867 1868 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1869 nfs4_schedule_state_manager(clp); 1870 if (freeme.type != 0) 1871 nfs4_test_and_free_stateid(server, &freeme, 1872 state->owner->so_cred); 1873 1874 return ret; 1875 } 1876 1877 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1878 const nfs4_stateid *stateid) 1879 { 1880 struct nfs4_state *state = lsp->ls_state; 1881 bool ret = false; 1882 1883 spin_lock(&state->state_lock); 1884 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1885 goto out_noupdate; 1886 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1887 goto out_noupdate; 1888 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1889 ret = true; 1890 out_noupdate: 1891 spin_unlock(&state->state_lock); 1892 return ret; 1893 } 1894 1895 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1896 { 1897 struct nfs_delegation *delegation; 1898 1899 fmode &= FMODE_READ|FMODE_WRITE; 1900 rcu_read_lock(); 1901 delegation = nfs4_get_valid_delegation(inode); 1902 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1903 rcu_read_unlock(); 1904 return; 1905 } 1906 rcu_read_unlock(); 1907 nfs4_inode_return_delegation(inode); 1908 } 1909 1910 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1911 { 1912 struct nfs4_state *state = opendata->state; 1913 struct nfs_delegation *delegation; 1914 int open_mode = opendata->o_arg.open_flags; 1915 fmode_t fmode = opendata->o_arg.fmode; 1916 enum open_claim_type4 claim = opendata->o_arg.claim; 1917 nfs4_stateid stateid; 1918 int ret = -EAGAIN; 1919 1920 for (;;) { 1921 spin_lock(&state->owner->so_lock); 1922 if (can_open_cached(state, fmode, open_mode, claim)) { 1923 update_open_stateflags(state, fmode); 1924 spin_unlock(&state->owner->so_lock); 1925 goto out_return_state; 1926 } 1927 spin_unlock(&state->owner->so_lock); 1928 rcu_read_lock(); 1929 delegation = nfs4_get_valid_delegation(state->inode); 1930 if (!can_open_delegated(delegation, fmode, claim)) { 1931 rcu_read_unlock(); 1932 break; 1933 } 1934 /* Save the delegation */ 1935 nfs4_stateid_copy(&stateid, &delegation->stateid); 1936 rcu_read_unlock(); 1937 nfs_release_seqid(opendata->o_arg.seqid); 1938 if (!opendata->is_recover) { 1939 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1940 if (ret != 0) 1941 goto out; 1942 } 1943 ret = -EAGAIN; 1944 1945 /* Try to update the stateid using the delegation */ 1946 if (update_open_stateid(state, NULL, &stateid, fmode)) 1947 goto out_return_state; 1948 } 1949 out: 1950 return ERR_PTR(ret); 1951 out_return_state: 1952 refcount_inc(&state->count); 1953 return state; 1954 } 1955 1956 static void 1957 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1958 { 1959 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1960 struct nfs_delegation *delegation; 1961 int delegation_flags = 0; 1962 1963 rcu_read_lock(); 1964 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1965 if (delegation) 1966 delegation_flags = delegation->flags; 1967 rcu_read_unlock(); 1968 switch (data->o_arg.claim) { 1969 default: 1970 break; 1971 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1972 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1973 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1974 "returning a delegation for " 1975 "OPEN(CLAIM_DELEGATE_CUR)\n", 1976 clp->cl_hostname); 1977 return; 1978 } 1979 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1980 nfs_inode_set_delegation(state->inode, 1981 data->owner->so_cred, 1982 data->o_res.delegation_type, 1983 &data->o_res.delegation, 1984 data->o_res.pagemod_limit); 1985 else 1986 nfs_inode_reclaim_delegation(state->inode, 1987 data->owner->so_cred, 1988 data->o_res.delegation_type, 1989 &data->o_res.delegation, 1990 data->o_res.pagemod_limit); 1991 1992 if (data->o_res.do_recall) 1993 nfs_async_inode_return_delegation(state->inode, 1994 &data->o_res.delegation); 1995 } 1996 1997 /* 1998 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1999 * and update the nfs4_state. 2000 */ 2001 static struct nfs4_state * 2002 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 2003 { 2004 struct inode *inode = data->state->inode; 2005 struct nfs4_state *state = data->state; 2006 int ret; 2007 2008 if (!data->rpc_done) { 2009 if (data->rpc_status) 2010 return ERR_PTR(data->rpc_status); 2011 return nfs4_try_open_cached(data); 2012 } 2013 2014 ret = nfs_refresh_inode(inode, &data->f_attr); 2015 if (ret) 2016 return ERR_PTR(ret); 2017 2018 if (data->o_res.delegation_type != 0) 2019 nfs4_opendata_check_deleg(data, state); 2020 2021 if (!update_open_stateid(state, &data->o_res.stateid, 2022 NULL, data->o_arg.fmode)) 2023 return ERR_PTR(-EAGAIN); 2024 refcount_inc(&state->count); 2025 2026 return state; 2027 } 2028 2029 static struct inode * 2030 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2031 { 2032 struct inode *inode; 2033 2034 switch (data->o_arg.claim) { 2035 case NFS4_OPEN_CLAIM_NULL: 2036 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2037 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2038 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2039 return ERR_PTR(-EAGAIN); 2040 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2041 &data->f_attr); 2042 break; 2043 default: 2044 inode = d_inode(data->dentry); 2045 ihold(inode); 2046 nfs_refresh_inode(inode, &data->f_attr); 2047 } 2048 return inode; 2049 } 2050 2051 static struct nfs4_state * 2052 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2053 { 2054 struct nfs4_state *state; 2055 struct inode *inode; 2056 2057 inode = nfs4_opendata_get_inode(data); 2058 if (IS_ERR(inode)) 2059 return ERR_CAST(inode); 2060 if (data->state != NULL && data->state->inode == inode) { 2061 state = data->state; 2062 refcount_inc(&state->count); 2063 } else 2064 state = nfs4_get_open_state(inode, data->owner); 2065 iput(inode); 2066 if (state == NULL) 2067 state = ERR_PTR(-ENOMEM); 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 *state; 2075 2076 if (!data->rpc_done) { 2077 state = nfs4_try_open_cached(data); 2078 trace_nfs4_cached_open(data->state); 2079 goto out; 2080 } 2081 2082 state = nfs4_opendata_find_nfs4_state(data); 2083 if (IS_ERR(state)) 2084 goto out; 2085 2086 if (data->o_res.delegation_type != 0) 2087 nfs4_opendata_check_deleg(data, state); 2088 if (!update_open_stateid(state, &data->o_res.stateid, 2089 NULL, data->o_arg.fmode)) { 2090 nfs4_put_open_state(state); 2091 state = ERR_PTR(-EAGAIN); 2092 } 2093 out: 2094 nfs_release_seqid(data->o_arg.seqid); 2095 return state; 2096 } 2097 2098 static struct nfs4_state * 2099 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2100 { 2101 struct nfs4_state *ret; 2102 2103 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2104 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2105 else 2106 ret = _nfs4_opendata_to_nfs4_state(data); 2107 nfs4_sequence_free_slot(&data->o_res.seq_res); 2108 return ret; 2109 } 2110 2111 static struct nfs_open_context * 2112 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2113 { 2114 struct nfs_inode *nfsi = NFS_I(state->inode); 2115 struct nfs_open_context *ctx; 2116 2117 rcu_read_lock(); 2118 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2119 if (ctx->state != state) 2120 continue; 2121 if ((ctx->mode & mode) != mode) 2122 continue; 2123 if (!get_nfs_open_context(ctx)) 2124 continue; 2125 rcu_read_unlock(); 2126 return ctx; 2127 } 2128 rcu_read_unlock(); 2129 return ERR_PTR(-ENOENT); 2130 } 2131 2132 static struct nfs_open_context * 2133 nfs4_state_find_open_context(struct nfs4_state *state) 2134 { 2135 struct nfs_open_context *ctx; 2136 2137 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2138 if (!IS_ERR(ctx)) 2139 return ctx; 2140 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2141 if (!IS_ERR(ctx)) 2142 return ctx; 2143 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2144 } 2145 2146 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2147 struct nfs4_state *state, enum open_claim_type4 claim) 2148 { 2149 struct nfs4_opendata *opendata; 2150 2151 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2152 NULL, claim, GFP_NOFS); 2153 if (opendata == NULL) 2154 return ERR_PTR(-ENOMEM); 2155 opendata->state = state; 2156 refcount_inc(&state->count); 2157 return opendata; 2158 } 2159 2160 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2161 fmode_t fmode) 2162 { 2163 struct nfs4_state *newstate; 2164 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2165 int openflags = opendata->o_arg.open_flags; 2166 int ret; 2167 2168 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2169 return 0; 2170 opendata->o_arg.fmode = fmode; 2171 opendata->o_arg.share_access = 2172 nfs4_map_atomic_open_share(server, fmode, openflags); 2173 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2174 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2175 nfs4_init_opendata_res(opendata); 2176 ret = _nfs4_recover_proc_open(opendata); 2177 if (ret != 0) 2178 return ret; 2179 newstate = nfs4_opendata_to_nfs4_state(opendata); 2180 if (IS_ERR(newstate)) 2181 return PTR_ERR(newstate); 2182 if (newstate != opendata->state) 2183 ret = -ESTALE; 2184 nfs4_close_state(newstate, fmode); 2185 return ret; 2186 } 2187 2188 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2189 { 2190 int ret; 2191 2192 /* memory barrier prior to reading state->n_* */ 2193 smp_rmb(); 2194 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2195 if (ret != 0) 2196 return ret; 2197 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2198 if (ret != 0) 2199 return ret; 2200 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2201 if (ret != 0) 2202 return ret; 2203 /* 2204 * We may have performed cached opens for all three recoveries. 2205 * Check if we need to update the current stateid. 2206 */ 2207 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2208 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2209 write_seqlock(&state->seqlock); 2210 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2211 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2212 write_sequnlock(&state->seqlock); 2213 } 2214 return 0; 2215 } 2216 2217 /* 2218 * OPEN_RECLAIM: 2219 * reclaim state on the server after a reboot. 2220 */ 2221 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2222 { 2223 struct nfs_delegation *delegation; 2224 struct nfs4_opendata *opendata; 2225 fmode_t delegation_type = 0; 2226 int status; 2227 2228 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2229 NFS4_OPEN_CLAIM_PREVIOUS); 2230 if (IS_ERR(opendata)) 2231 return PTR_ERR(opendata); 2232 rcu_read_lock(); 2233 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2234 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2235 delegation_type = delegation->type; 2236 rcu_read_unlock(); 2237 opendata->o_arg.u.delegation_type = delegation_type; 2238 status = nfs4_open_recover(opendata, state); 2239 nfs4_opendata_put(opendata); 2240 return status; 2241 } 2242 2243 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2244 { 2245 struct nfs_server *server = NFS_SERVER(state->inode); 2246 struct nfs4_exception exception = { }; 2247 int err; 2248 do { 2249 err = _nfs4_do_open_reclaim(ctx, state); 2250 trace_nfs4_open_reclaim(ctx, 0, err); 2251 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2252 continue; 2253 if (err != -NFS4ERR_DELAY) 2254 break; 2255 nfs4_handle_exception(server, err, &exception); 2256 } while (exception.retry); 2257 return err; 2258 } 2259 2260 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2261 { 2262 struct nfs_open_context *ctx; 2263 int ret; 2264 2265 ctx = nfs4_state_find_open_context(state); 2266 if (IS_ERR(ctx)) 2267 return -EAGAIN; 2268 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2269 nfs_state_clear_open_state_flags(state); 2270 ret = nfs4_do_open_reclaim(ctx, state); 2271 put_nfs_open_context(ctx); 2272 return ret; 2273 } 2274 2275 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) 2276 { 2277 switch (err) { 2278 default: 2279 printk(KERN_ERR "NFS: %s: unhandled error " 2280 "%d.\n", __func__, err); 2281 fallthrough; 2282 case 0: 2283 case -ENOENT: 2284 case -EAGAIN: 2285 case -ESTALE: 2286 case -ETIMEDOUT: 2287 break; 2288 case -NFS4ERR_BADSESSION: 2289 case -NFS4ERR_BADSLOT: 2290 case -NFS4ERR_BAD_HIGH_SLOT: 2291 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2292 case -NFS4ERR_DEADSESSION: 2293 return -EAGAIN; 2294 case -NFS4ERR_STALE_CLIENTID: 2295 case -NFS4ERR_STALE_STATEID: 2296 /* Don't recall a delegation if it was lost */ 2297 nfs4_schedule_lease_recovery(server->nfs_client); 2298 return -EAGAIN; 2299 case -NFS4ERR_MOVED: 2300 nfs4_schedule_migration_recovery(server); 2301 return -EAGAIN; 2302 case -NFS4ERR_LEASE_MOVED: 2303 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2304 return -EAGAIN; 2305 case -NFS4ERR_DELEG_REVOKED: 2306 case -NFS4ERR_ADMIN_REVOKED: 2307 case -NFS4ERR_EXPIRED: 2308 case -NFS4ERR_BAD_STATEID: 2309 case -NFS4ERR_OPENMODE: 2310 nfs_inode_find_state_and_recover(state->inode, 2311 stateid); 2312 nfs4_schedule_stateid_recovery(server, state); 2313 return -EAGAIN; 2314 case -NFS4ERR_DELAY: 2315 case -NFS4ERR_GRACE: 2316 ssleep(1); 2317 return -EAGAIN; 2318 case -ENOMEM: 2319 case -NFS4ERR_DENIED: 2320 if (fl) { 2321 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2322 if (lsp) 2323 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2324 } 2325 return 0; 2326 } 2327 return err; 2328 } 2329 2330 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2331 struct nfs4_state *state, const nfs4_stateid *stateid) 2332 { 2333 struct nfs_server *server = NFS_SERVER(state->inode); 2334 struct nfs4_opendata *opendata; 2335 int err = 0; 2336 2337 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2338 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2339 if (IS_ERR(opendata)) 2340 return PTR_ERR(opendata); 2341 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2342 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2343 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2344 if (err) 2345 goto out; 2346 } 2347 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2348 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2349 if (err) 2350 goto out; 2351 } 2352 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2353 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2354 if (err) 2355 goto out; 2356 } 2357 nfs_state_clear_delegation(state); 2358 out: 2359 nfs4_opendata_put(opendata); 2360 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2361 } 2362 2363 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2364 { 2365 struct nfs4_opendata *data = calldata; 2366 2367 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2368 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2369 } 2370 2371 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2372 { 2373 struct nfs4_opendata *data = calldata; 2374 2375 nfs40_sequence_done(task, &data->c_res.seq_res); 2376 2377 data->rpc_status = task->tk_status; 2378 if (data->rpc_status == 0) { 2379 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2380 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2381 renew_lease(data->o_res.server, data->timestamp); 2382 data->rpc_done = true; 2383 } 2384 } 2385 2386 static void nfs4_open_confirm_release(void *calldata) 2387 { 2388 struct nfs4_opendata *data = calldata; 2389 struct nfs4_state *state = NULL; 2390 2391 /* If this request hasn't been cancelled, do nothing */ 2392 if (!data->cancelled) 2393 goto out_free; 2394 /* In case of error, no cleanup! */ 2395 if (!data->rpc_done) 2396 goto out_free; 2397 state = nfs4_opendata_to_nfs4_state(data); 2398 if (!IS_ERR(state)) 2399 nfs4_close_state(state, data->o_arg.fmode); 2400 out_free: 2401 nfs4_opendata_put(data); 2402 } 2403 2404 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2405 .rpc_call_prepare = nfs4_open_confirm_prepare, 2406 .rpc_call_done = nfs4_open_confirm_done, 2407 .rpc_release = nfs4_open_confirm_release, 2408 }; 2409 2410 /* 2411 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2412 */ 2413 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2414 { 2415 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2416 struct rpc_task *task; 2417 struct rpc_message msg = { 2418 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2419 .rpc_argp = &data->c_arg, 2420 .rpc_resp = &data->c_res, 2421 .rpc_cred = data->owner->so_cred, 2422 }; 2423 struct rpc_task_setup task_setup_data = { 2424 .rpc_client = server->client, 2425 .rpc_message = &msg, 2426 .callback_ops = &nfs4_open_confirm_ops, 2427 .callback_data = data, 2428 .workqueue = nfsiod_workqueue, 2429 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2430 }; 2431 int status; 2432 2433 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2434 data->is_recover); 2435 kref_get(&data->kref); 2436 data->rpc_done = false; 2437 data->rpc_status = 0; 2438 data->timestamp = jiffies; 2439 task = rpc_run_task(&task_setup_data); 2440 if (IS_ERR(task)) 2441 return PTR_ERR(task); 2442 status = rpc_wait_for_completion_task(task); 2443 if (status != 0) { 2444 data->cancelled = true; 2445 smp_wmb(); 2446 } else 2447 status = data->rpc_status; 2448 rpc_put_task(task); 2449 return status; 2450 } 2451 2452 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2453 { 2454 struct nfs4_opendata *data = calldata; 2455 struct nfs4_state_owner *sp = data->owner; 2456 struct nfs_client *clp = sp->so_server->nfs_client; 2457 enum open_claim_type4 claim = data->o_arg.claim; 2458 2459 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2460 goto out_wait; 2461 /* 2462 * Check if we still need to send an OPEN call, or if we can use 2463 * a delegation instead. 2464 */ 2465 if (data->state != NULL) { 2466 struct nfs_delegation *delegation; 2467 2468 if (can_open_cached(data->state, data->o_arg.fmode, 2469 data->o_arg.open_flags, claim)) 2470 goto out_no_action; 2471 rcu_read_lock(); 2472 delegation = nfs4_get_valid_delegation(data->state->inode); 2473 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2474 goto unlock_no_action; 2475 rcu_read_unlock(); 2476 } 2477 /* Update client id. */ 2478 data->o_arg.clientid = clp->cl_clientid; 2479 switch (claim) { 2480 default: 2481 break; 2482 case NFS4_OPEN_CLAIM_PREVIOUS: 2483 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2484 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2485 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2486 fallthrough; 2487 case NFS4_OPEN_CLAIM_FH: 2488 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2489 } 2490 data->timestamp = jiffies; 2491 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2492 &data->o_arg.seq_args, 2493 &data->o_res.seq_res, 2494 task) != 0) 2495 nfs_release_seqid(data->o_arg.seqid); 2496 2497 /* Set the create mode (note dependency on the session type) */ 2498 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2499 if (data->o_arg.open_flags & O_EXCL) { 2500 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2501 if (clp->cl_mvops->minor_version == 0) { 2502 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2503 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2504 * because ACCESS will return permission denied for 2505 * all bits until close */ 2506 data->o_res.access_request = data->o_arg.access = 0; 2507 } else if (nfs4_has_persistent_session(clp)) 2508 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2509 } 2510 return; 2511 unlock_no_action: 2512 trace_nfs4_cached_open(data->state); 2513 rcu_read_unlock(); 2514 out_no_action: 2515 task->tk_action = NULL; 2516 out_wait: 2517 nfs4_sequence_done(task, &data->o_res.seq_res); 2518 } 2519 2520 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2521 { 2522 struct nfs4_opendata *data = calldata; 2523 2524 data->rpc_status = task->tk_status; 2525 2526 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2527 return; 2528 2529 if (task->tk_status == 0) { 2530 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2531 switch (data->o_res.f_attr->mode & S_IFMT) { 2532 case S_IFREG: 2533 break; 2534 case S_IFLNK: 2535 data->rpc_status = -ELOOP; 2536 break; 2537 case S_IFDIR: 2538 data->rpc_status = -EISDIR; 2539 break; 2540 default: 2541 data->rpc_status = -ENOTDIR; 2542 } 2543 } 2544 renew_lease(data->o_res.server, data->timestamp); 2545 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2546 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2547 } 2548 data->rpc_done = true; 2549 } 2550 2551 static void nfs4_open_release(void *calldata) 2552 { 2553 struct nfs4_opendata *data = calldata; 2554 struct nfs4_state *state = NULL; 2555 2556 /* If this request hasn't been cancelled, do nothing */ 2557 if (!data->cancelled) 2558 goto out_free; 2559 /* In case of error, no cleanup! */ 2560 if (data->rpc_status != 0 || !data->rpc_done) 2561 goto out_free; 2562 /* In case we need an open_confirm, no cleanup! */ 2563 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2564 goto out_free; 2565 state = nfs4_opendata_to_nfs4_state(data); 2566 if (!IS_ERR(state)) 2567 nfs4_close_state(state, data->o_arg.fmode); 2568 out_free: 2569 nfs4_opendata_put(data); 2570 } 2571 2572 static const struct rpc_call_ops nfs4_open_ops = { 2573 .rpc_call_prepare = nfs4_open_prepare, 2574 .rpc_call_done = nfs4_open_done, 2575 .rpc_release = nfs4_open_release, 2576 }; 2577 2578 static int nfs4_run_open_task(struct nfs4_opendata *data, 2579 struct nfs_open_context *ctx) 2580 { 2581 struct inode *dir = d_inode(data->dir); 2582 struct nfs_server *server = NFS_SERVER(dir); 2583 struct nfs_openargs *o_arg = &data->o_arg; 2584 struct nfs_openres *o_res = &data->o_res; 2585 struct rpc_task *task; 2586 struct rpc_message msg = { 2587 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2588 .rpc_argp = o_arg, 2589 .rpc_resp = o_res, 2590 .rpc_cred = data->owner->so_cred, 2591 }; 2592 struct rpc_task_setup task_setup_data = { 2593 .rpc_client = server->client, 2594 .rpc_message = &msg, 2595 .callback_ops = &nfs4_open_ops, 2596 .callback_data = data, 2597 .workqueue = nfsiod_workqueue, 2598 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2599 }; 2600 int status; 2601 2602 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2603 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2604 2605 kref_get(&data->kref); 2606 data->rpc_done = false; 2607 data->rpc_status = 0; 2608 data->cancelled = false; 2609 data->is_recover = false; 2610 if (!ctx) { 2611 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2612 data->is_recover = true; 2613 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2614 } else { 2615 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2616 pnfs_lgopen_prepare(data, ctx); 2617 } 2618 task = rpc_run_task(&task_setup_data); 2619 if (IS_ERR(task)) 2620 return PTR_ERR(task); 2621 status = rpc_wait_for_completion_task(task); 2622 if (status != 0) { 2623 data->cancelled = true; 2624 smp_wmb(); 2625 } else 2626 status = data->rpc_status; 2627 rpc_put_task(task); 2628 2629 return status; 2630 } 2631 2632 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2633 { 2634 struct inode *dir = d_inode(data->dir); 2635 struct nfs_openres *o_res = &data->o_res; 2636 int status; 2637 2638 status = nfs4_run_open_task(data, NULL); 2639 if (status != 0 || !data->rpc_done) 2640 return status; 2641 2642 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2643 2644 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2645 status = _nfs4_proc_open_confirm(data); 2646 2647 return status; 2648 } 2649 2650 /* 2651 * Additional permission checks in order to distinguish between an 2652 * open for read, and an open for execute. This works around the 2653 * fact that NFSv4 OPEN treats read and execute permissions as being 2654 * the same. 2655 * Note that in the non-execute case, we want to turn off permission 2656 * checking if we just created a new file (POSIX open() semantics). 2657 */ 2658 static int nfs4_opendata_access(const struct cred *cred, 2659 struct nfs4_opendata *opendata, 2660 struct nfs4_state *state, fmode_t fmode) 2661 { 2662 struct nfs_access_entry cache; 2663 u32 mask, flags; 2664 2665 /* access call failed or for some reason the server doesn't 2666 * support any access modes -- defer access call until later */ 2667 if (opendata->o_res.access_supported == 0) 2668 return 0; 2669 2670 mask = 0; 2671 if (fmode & FMODE_EXEC) { 2672 /* ONLY check for exec rights */ 2673 if (S_ISDIR(state->inode->i_mode)) 2674 mask = NFS4_ACCESS_LOOKUP; 2675 else 2676 mask = NFS4_ACCESS_EXECUTE; 2677 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2678 mask = NFS4_ACCESS_READ; 2679 2680 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2681 nfs_access_add_cache(state->inode, &cache, cred); 2682 2683 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2684 if ((mask & ~cache.mask & flags) == 0) 2685 return 0; 2686 2687 return -EACCES; 2688 } 2689 2690 /* 2691 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2692 */ 2693 static int _nfs4_proc_open(struct nfs4_opendata *data, 2694 struct nfs_open_context *ctx) 2695 { 2696 struct inode *dir = d_inode(data->dir); 2697 struct nfs_server *server = NFS_SERVER(dir); 2698 struct nfs_openargs *o_arg = &data->o_arg; 2699 struct nfs_openres *o_res = &data->o_res; 2700 int status; 2701 2702 status = nfs4_run_open_task(data, ctx); 2703 if (!data->rpc_done) 2704 return status; 2705 if (status != 0) { 2706 if (status == -NFS4ERR_BADNAME && 2707 !(o_arg->open_flags & O_CREAT)) 2708 return -ENOENT; 2709 return status; 2710 } 2711 2712 nfs_fattr_map_and_free_names(server, &data->f_attr); 2713 2714 if (o_arg->open_flags & O_CREAT) { 2715 if (o_arg->open_flags & O_EXCL) 2716 data->file_created = true; 2717 else if (o_res->cinfo.before != o_res->cinfo.after) 2718 data->file_created = true; 2719 if (data->file_created || 2720 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2721 nfs4_update_changeattr(dir, &o_res->cinfo, 2722 o_res->f_attr->time_start, 2723 NFS_INO_INVALID_DATA); 2724 } 2725 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2726 server->caps &= ~NFS_CAP_POSIX_LOCK; 2727 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2728 status = _nfs4_proc_open_confirm(data); 2729 if (status != 0) 2730 return status; 2731 } 2732 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2733 struct nfs_fh *fh = &o_res->fh; 2734 2735 nfs4_sequence_free_slot(&o_res->seq_res); 2736 if (o_arg->claim == NFS4_OPEN_CLAIM_FH) 2737 fh = NFS_FH(d_inode(data->dentry)); 2738 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL); 2739 } 2740 return 0; 2741 } 2742 2743 /* 2744 * OPEN_EXPIRED: 2745 * reclaim state on the server after a network partition. 2746 * Assumes caller holds the appropriate lock 2747 */ 2748 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2749 { 2750 struct nfs4_opendata *opendata; 2751 int ret; 2752 2753 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2754 if (IS_ERR(opendata)) 2755 return PTR_ERR(opendata); 2756 /* 2757 * We're not recovering a delegation, so ask for no delegation. 2758 * Otherwise the recovery thread could deadlock with an outstanding 2759 * delegation return. 2760 */ 2761 opendata->o_arg.open_flags = O_DIRECT; 2762 ret = nfs4_open_recover(opendata, state); 2763 if (ret == -ESTALE) 2764 d_drop(ctx->dentry); 2765 nfs4_opendata_put(opendata); 2766 return ret; 2767 } 2768 2769 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2770 { 2771 struct nfs_server *server = NFS_SERVER(state->inode); 2772 struct nfs4_exception exception = { }; 2773 int err; 2774 2775 do { 2776 err = _nfs4_open_expired(ctx, state); 2777 trace_nfs4_open_expired(ctx, 0, err); 2778 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2779 continue; 2780 switch (err) { 2781 default: 2782 goto out; 2783 case -NFS4ERR_GRACE: 2784 case -NFS4ERR_DELAY: 2785 nfs4_handle_exception(server, err, &exception); 2786 err = 0; 2787 } 2788 } while (exception.retry); 2789 out: 2790 return err; 2791 } 2792 2793 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2794 { 2795 struct nfs_open_context *ctx; 2796 int ret; 2797 2798 ctx = nfs4_state_find_open_context(state); 2799 if (IS_ERR(ctx)) 2800 return -EAGAIN; 2801 ret = nfs4_do_open_expired(ctx, state); 2802 put_nfs_open_context(ctx); 2803 return ret; 2804 } 2805 2806 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2807 const nfs4_stateid *stateid) 2808 { 2809 nfs_remove_bad_delegation(state->inode, stateid); 2810 nfs_state_clear_delegation(state); 2811 } 2812 2813 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2814 { 2815 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2816 nfs_finish_clear_delegation_stateid(state, NULL); 2817 } 2818 2819 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2820 { 2821 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2822 nfs40_clear_delegation_stateid(state); 2823 nfs_state_clear_open_state_flags(state); 2824 return nfs4_open_expired(sp, state); 2825 } 2826 2827 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2828 nfs4_stateid *stateid, 2829 const struct cred *cred) 2830 { 2831 return -NFS4ERR_BAD_STATEID; 2832 } 2833 2834 #if defined(CONFIG_NFS_V4_1) 2835 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2836 nfs4_stateid *stateid, 2837 const struct cred *cred) 2838 { 2839 int status; 2840 2841 switch (stateid->type) { 2842 default: 2843 break; 2844 case NFS4_INVALID_STATEID_TYPE: 2845 case NFS4_SPECIAL_STATEID_TYPE: 2846 return -NFS4ERR_BAD_STATEID; 2847 case NFS4_REVOKED_STATEID_TYPE: 2848 goto out_free; 2849 } 2850 2851 status = nfs41_test_stateid(server, stateid, cred); 2852 switch (status) { 2853 case -NFS4ERR_EXPIRED: 2854 case -NFS4ERR_ADMIN_REVOKED: 2855 case -NFS4ERR_DELEG_REVOKED: 2856 break; 2857 default: 2858 return status; 2859 } 2860 out_free: 2861 /* Ack the revoked state to the server */ 2862 nfs41_free_stateid(server, stateid, cred, true); 2863 return -NFS4ERR_EXPIRED; 2864 } 2865 2866 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2867 { 2868 struct nfs_server *server = NFS_SERVER(state->inode); 2869 nfs4_stateid stateid; 2870 struct nfs_delegation *delegation; 2871 const struct cred *cred = NULL; 2872 int status, ret = NFS_OK; 2873 2874 /* Get the delegation credential for use by test/free_stateid */ 2875 rcu_read_lock(); 2876 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2877 if (delegation == NULL) { 2878 rcu_read_unlock(); 2879 nfs_state_clear_delegation(state); 2880 return NFS_OK; 2881 } 2882 2883 spin_lock(&delegation->lock); 2884 nfs4_stateid_copy(&stateid, &delegation->stateid); 2885 2886 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2887 &delegation->flags)) { 2888 spin_unlock(&delegation->lock); 2889 rcu_read_unlock(); 2890 return NFS_OK; 2891 } 2892 2893 if (delegation->cred) 2894 cred = get_cred(delegation->cred); 2895 spin_unlock(&delegation->lock); 2896 rcu_read_unlock(); 2897 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2898 trace_nfs4_test_delegation_stateid(state, NULL, status); 2899 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2900 nfs_finish_clear_delegation_stateid(state, &stateid); 2901 else 2902 ret = status; 2903 2904 put_cred(cred); 2905 return ret; 2906 } 2907 2908 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2909 { 2910 nfs4_stateid tmp; 2911 2912 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2913 nfs4_copy_delegation_stateid(state->inode, state->state, 2914 &tmp, NULL) && 2915 nfs4_stateid_match_other(&state->stateid, &tmp)) 2916 nfs_state_set_delegation(state, &tmp, state->state); 2917 else 2918 nfs_state_clear_delegation(state); 2919 } 2920 2921 /** 2922 * nfs41_check_expired_locks - possibly free a lock stateid 2923 * 2924 * @state: NFSv4 state for an inode 2925 * 2926 * Returns NFS_OK if recovery for this stateid is now finished. 2927 * Otherwise a negative NFS4ERR value is returned. 2928 */ 2929 static int nfs41_check_expired_locks(struct nfs4_state *state) 2930 { 2931 int status, ret = NFS_OK; 2932 struct nfs4_lock_state *lsp, *prev = NULL; 2933 struct nfs_server *server = NFS_SERVER(state->inode); 2934 2935 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2936 goto out; 2937 2938 spin_lock(&state->state_lock); 2939 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2940 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2941 const struct cred *cred = lsp->ls_state->owner->so_cred; 2942 2943 refcount_inc(&lsp->ls_count); 2944 spin_unlock(&state->state_lock); 2945 2946 nfs4_put_lock_state(prev); 2947 prev = lsp; 2948 2949 status = nfs41_test_and_free_expired_stateid(server, 2950 &lsp->ls_stateid, 2951 cred); 2952 trace_nfs4_test_lock_stateid(state, lsp, status); 2953 if (status == -NFS4ERR_EXPIRED || 2954 status == -NFS4ERR_BAD_STATEID) { 2955 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2956 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2957 if (!recover_lost_locks) 2958 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2959 } else if (status != NFS_OK) { 2960 ret = status; 2961 nfs4_put_lock_state(prev); 2962 goto out; 2963 } 2964 spin_lock(&state->state_lock); 2965 } 2966 } 2967 spin_unlock(&state->state_lock); 2968 nfs4_put_lock_state(prev); 2969 out: 2970 return ret; 2971 } 2972 2973 /** 2974 * nfs41_check_open_stateid - possibly free an open stateid 2975 * 2976 * @state: NFSv4 state for an inode 2977 * 2978 * Returns NFS_OK if recovery for this stateid is now finished. 2979 * Otherwise a negative NFS4ERR value is returned. 2980 */ 2981 static int nfs41_check_open_stateid(struct nfs4_state *state) 2982 { 2983 struct nfs_server *server = NFS_SERVER(state->inode); 2984 nfs4_stateid *stateid = &state->open_stateid; 2985 const struct cred *cred = state->owner->so_cred; 2986 int status; 2987 2988 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2989 return -NFS4ERR_BAD_STATEID; 2990 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2991 trace_nfs4_test_open_stateid(state, NULL, status); 2992 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2993 nfs_state_clear_open_state_flags(state); 2994 stateid->type = NFS4_INVALID_STATEID_TYPE; 2995 return status; 2996 } 2997 if (nfs_open_stateid_recover_openmode(state)) 2998 return -NFS4ERR_OPENMODE; 2999 return NFS_OK; 3000 } 3001 3002 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 3003 { 3004 int status; 3005 3006 status = nfs41_check_delegation_stateid(state); 3007 if (status != NFS_OK) 3008 return status; 3009 nfs41_delegation_recover_stateid(state); 3010 3011 status = nfs41_check_expired_locks(state); 3012 if (status != NFS_OK) 3013 return status; 3014 status = nfs41_check_open_stateid(state); 3015 if (status != NFS_OK) 3016 status = nfs4_open_expired(sp, state); 3017 return status; 3018 } 3019 #endif 3020 3021 /* 3022 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 3023 * fields corresponding to attributes that were used to store the verifier. 3024 * Make sure we clobber those fields in the later setattr call 3025 */ 3026 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 3027 struct iattr *sattr, struct nfs4_label **label) 3028 { 3029 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 3030 __u32 attrset[3]; 3031 unsigned ret; 3032 unsigned i; 3033 3034 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3035 attrset[i] = opendata->o_res.attrset[i]; 3036 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3037 attrset[i] &= ~bitmask[i]; 3038 } 3039 3040 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3041 sattr->ia_valid : 0; 3042 3043 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3044 if (sattr->ia_valid & ATTR_ATIME_SET) 3045 ret |= ATTR_ATIME_SET; 3046 else 3047 ret |= ATTR_ATIME; 3048 } 3049 3050 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3051 if (sattr->ia_valid & ATTR_MTIME_SET) 3052 ret |= ATTR_MTIME_SET; 3053 else 3054 ret |= ATTR_MTIME; 3055 } 3056 3057 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3058 *label = NULL; 3059 return ret; 3060 } 3061 3062 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3063 struct nfs_open_context *ctx) 3064 { 3065 struct nfs4_state_owner *sp = opendata->owner; 3066 struct nfs_server *server = sp->so_server; 3067 struct dentry *dentry; 3068 struct nfs4_state *state; 3069 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3070 struct inode *dir = d_inode(opendata->dir); 3071 unsigned long dir_verifier; 3072 int ret; 3073 3074 dir_verifier = nfs_save_change_attribute(dir); 3075 3076 ret = _nfs4_proc_open(opendata, ctx); 3077 if (ret != 0) 3078 goto out; 3079 3080 state = _nfs4_opendata_to_nfs4_state(opendata); 3081 ret = PTR_ERR(state); 3082 if (IS_ERR(state)) 3083 goto out; 3084 ctx->state = state; 3085 if (server->caps & NFS_CAP_POSIX_LOCK) 3086 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3087 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3088 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3089 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3090 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3091 3092 dentry = opendata->dentry; 3093 if (d_really_is_negative(dentry)) { 3094 struct dentry *alias; 3095 d_drop(dentry); 3096 alias = d_exact_alias(dentry, state->inode); 3097 if (!alias) 3098 alias = d_splice_alias(igrab(state->inode), dentry); 3099 /* d_splice_alias() can't fail here - it's a non-directory */ 3100 if (alias) { 3101 dput(ctx->dentry); 3102 ctx->dentry = dentry = alias; 3103 } 3104 } 3105 3106 switch(opendata->o_arg.claim) { 3107 default: 3108 break; 3109 case NFS4_OPEN_CLAIM_NULL: 3110 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3111 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3112 if (!opendata->rpc_done) 3113 break; 3114 if (opendata->o_res.delegation_type != 0) 3115 dir_verifier = nfs_save_change_attribute(dir); 3116 nfs_set_verifier(dentry, dir_verifier); 3117 } 3118 3119 /* Parse layoutget results before we check for access */ 3120 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3121 3122 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3123 if (ret != 0) 3124 goto out; 3125 3126 if (d_inode(dentry) == state->inode) 3127 nfs_inode_attach_open_context(ctx); 3128 3129 out: 3130 if (!opendata->cancelled) { 3131 if (opendata->lgp) { 3132 nfs4_lgopen_release(opendata->lgp); 3133 opendata->lgp = NULL; 3134 } 3135 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3136 } 3137 return ret; 3138 } 3139 3140 /* 3141 * Returns a referenced nfs4_state 3142 */ 3143 static int _nfs4_do_open(struct inode *dir, 3144 struct nfs_open_context *ctx, 3145 int flags, 3146 const struct nfs4_open_createattrs *c, 3147 int *opened) 3148 { 3149 struct nfs4_state_owner *sp; 3150 struct nfs4_state *state = NULL; 3151 struct nfs_server *server = NFS_SERVER(dir); 3152 struct nfs4_opendata *opendata; 3153 struct dentry *dentry = ctx->dentry; 3154 const struct cred *cred = ctx->cred; 3155 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3156 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3157 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3158 struct iattr *sattr = c->sattr; 3159 struct nfs4_label *label = c->label; 3160 int status; 3161 3162 /* Protect against reboot recovery conflicts */ 3163 status = -ENOMEM; 3164 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3165 if (sp == NULL) { 3166 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3167 goto out_err; 3168 } 3169 status = nfs4_client_recover_expired_lease(server->nfs_client); 3170 if (status != 0) 3171 goto err_put_state_owner; 3172 if (d_really_is_positive(dentry)) 3173 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3174 status = -ENOMEM; 3175 if (d_really_is_positive(dentry)) 3176 claim = NFS4_OPEN_CLAIM_FH; 3177 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3178 c, claim, GFP_KERNEL); 3179 if (opendata == NULL) 3180 goto err_put_state_owner; 3181 3182 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3183 if (!opendata->f_attr.mdsthreshold) { 3184 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3185 if (!opendata->f_attr.mdsthreshold) 3186 goto err_opendata_put; 3187 } 3188 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3189 } 3190 if (d_really_is_positive(dentry)) 3191 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3192 3193 status = _nfs4_open_and_get_state(opendata, ctx); 3194 if (status != 0) 3195 goto err_opendata_put; 3196 state = ctx->state; 3197 3198 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3199 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3200 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3201 /* 3202 * send create attributes which was not set by open 3203 * with an extra setattr. 3204 */ 3205 if (attrs || label) { 3206 unsigned ia_old = sattr->ia_valid; 3207 3208 sattr->ia_valid = attrs; 3209 nfs_fattr_init(opendata->o_res.f_attr); 3210 status = nfs4_do_setattr(state->inode, cred, 3211 opendata->o_res.f_attr, sattr, 3212 ctx, label); 3213 if (status == 0) { 3214 nfs_setattr_update_inode(state->inode, sattr, 3215 opendata->o_res.f_attr); 3216 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3217 } 3218 sattr->ia_valid = ia_old; 3219 } 3220 } 3221 if (opened && opendata->file_created) 3222 *opened = 1; 3223 3224 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3225 *ctx_th = opendata->f_attr.mdsthreshold; 3226 opendata->f_attr.mdsthreshold = NULL; 3227 } 3228 3229 nfs4_opendata_put(opendata); 3230 nfs4_put_state_owner(sp); 3231 return 0; 3232 err_opendata_put: 3233 nfs4_opendata_put(opendata); 3234 err_put_state_owner: 3235 nfs4_put_state_owner(sp); 3236 out_err: 3237 return status; 3238 } 3239 3240 3241 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3242 struct nfs_open_context *ctx, 3243 int flags, 3244 struct iattr *sattr, 3245 struct nfs4_label *label, 3246 int *opened) 3247 { 3248 struct nfs_server *server = NFS_SERVER(dir); 3249 struct nfs4_exception exception = { 3250 .interruptible = true, 3251 }; 3252 struct nfs4_state *res; 3253 struct nfs4_open_createattrs c = { 3254 .label = label, 3255 .sattr = sattr, 3256 .verf = { 3257 [0] = (__u32)jiffies, 3258 [1] = (__u32)current->pid, 3259 }, 3260 }; 3261 int status; 3262 3263 do { 3264 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3265 res = ctx->state; 3266 trace_nfs4_open_file(ctx, flags, status); 3267 if (status == 0) 3268 break; 3269 /* NOTE: BAD_SEQID means the server and client disagree about the 3270 * book-keeping w.r.t. state-changing operations 3271 * (OPEN/CLOSE/LOCK/LOCKU...) 3272 * It is actually a sign of a bug on the client or on the server. 3273 * 3274 * If we receive a BAD_SEQID error in the particular case of 3275 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3276 * have unhashed the old state_owner for us, and that we can 3277 * therefore safely retry using a new one. We should still warn 3278 * the user though... 3279 */ 3280 if (status == -NFS4ERR_BAD_SEQID) { 3281 pr_warn_ratelimited("NFS: v4 server %s " 3282 " returned a bad sequence-id error!\n", 3283 NFS_SERVER(dir)->nfs_client->cl_hostname); 3284 exception.retry = 1; 3285 continue; 3286 } 3287 /* 3288 * BAD_STATEID on OPEN means that the server cancelled our 3289 * state before it received the OPEN_CONFIRM. 3290 * Recover by retrying the request as per the discussion 3291 * on Page 181 of RFC3530. 3292 */ 3293 if (status == -NFS4ERR_BAD_STATEID) { 3294 exception.retry = 1; 3295 continue; 3296 } 3297 if (status == -NFS4ERR_EXPIRED) { 3298 nfs4_schedule_lease_recovery(server->nfs_client); 3299 exception.retry = 1; 3300 continue; 3301 } 3302 if (status == -EAGAIN) { 3303 /* We must have found a delegation */ 3304 exception.retry = 1; 3305 continue; 3306 } 3307 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3308 continue; 3309 res = ERR_PTR(nfs4_handle_exception(server, 3310 status, &exception)); 3311 } while (exception.retry); 3312 return res; 3313 } 3314 3315 static int _nfs4_do_setattr(struct inode *inode, 3316 struct nfs_setattrargs *arg, 3317 struct nfs_setattrres *res, 3318 const struct cred *cred, 3319 struct nfs_open_context *ctx) 3320 { 3321 struct nfs_server *server = NFS_SERVER(inode); 3322 struct rpc_message msg = { 3323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3324 .rpc_argp = arg, 3325 .rpc_resp = res, 3326 .rpc_cred = cred, 3327 }; 3328 const struct cred *delegation_cred = NULL; 3329 unsigned long timestamp = jiffies; 3330 bool truncate; 3331 int status; 3332 3333 nfs_fattr_init(res->fattr); 3334 3335 /* Servers should only apply open mode checks for file size changes */ 3336 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3337 if (!truncate) { 3338 nfs4_inode_make_writeable(inode); 3339 goto zero_stateid; 3340 } 3341 3342 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3343 /* Use that stateid */ 3344 } else if (ctx != NULL && ctx->state) { 3345 struct nfs_lock_context *l_ctx; 3346 if (!nfs4_valid_open_stateid(ctx->state)) 3347 return -EBADF; 3348 l_ctx = nfs_get_lock_context(ctx); 3349 if (IS_ERR(l_ctx)) 3350 return PTR_ERR(l_ctx); 3351 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3352 &arg->stateid, &delegation_cred); 3353 nfs_put_lock_context(l_ctx); 3354 if (status == -EIO) 3355 return -EBADF; 3356 else if (status == -EAGAIN) 3357 goto zero_stateid; 3358 } else { 3359 zero_stateid: 3360 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3361 } 3362 if (delegation_cred) 3363 msg.rpc_cred = delegation_cred; 3364 3365 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3366 3367 put_cred(delegation_cred); 3368 if (status == 0 && ctx != NULL) 3369 renew_lease(server, timestamp); 3370 trace_nfs4_setattr(inode, &arg->stateid, status); 3371 return status; 3372 } 3373 3374 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3375 struct nfs_fattr *fattr, struct iattr *sattr, 3376 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3377 { 3378 struct nfs_server *server = NFS_SERVER(inode); 3379 __u32 bitmask[NFS4_BITMASK_SZ]; 3380 struct nfs4_state *state = ctx ? ctx->state : NULL; 3381 struct nfs_setattrargs arg = { 3382 .fh = NFS_FH(inode), 3383 .iap = sattr, 3384 .server = server, 3385 .bitmask = bitmask, 3386 .label = ilabel, 3387 }; 3388 struct nfs_setattrres res = { 3389 .fattr = fattr, 3390 .server = server, 3391 }; 3392 struct nfs4_exception exception = { 3393 .state = state, 3394 .inode = inode, 3395 .stateid = &arg.stateid, 3396 }; 3397 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3398 int err; 3399 3400 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3401 adjust_flags |= NFS_INO_INVALID_MODE; 3402 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3403 adjust_flags |= NFS_INO_INVALID_OTHER; 3404 3405 do { 3406 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3407 inode, adjust_flags); 3408 3409 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3410 switch (err) { 3411 case -NFS4ERR_OPENMODE: 3412 if (!(sattr->ia_valid & ATTR_SIZE)) { 3413 pr_warn_once("NFSv4: server %s is incorrectly " 3414 "applying open mode checks to " 3415 "a SETATTR that is not " 3416 "changing file size.\n", 3417 server->nfs_client->cl_hostname); 3418 } 3419 if (state && !(state->state & FMODE_WRITE)) { 3420 err = -EBADF; 3421 if (sattr->ia_valid & ATTR_OPEN) 3422 err = -EACCES; 3423 goto out; 3424 } 3425 } 3426 err = nfs4_handle_exception(server, err, &exception); 3427 } while (exception.retry); 3428 out: 3429 return err; 3430 } 3431 3432 static bool 3433 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3434 { 3435 if (inode == NULL || !nfs_have_layout(inode)) 3436 return false; 3437 3438 return pnfs_wait_on_layoutreturn(inode, task); 3439 } 3440 3441 /* 3442 * Update the seqid of an open stateid 3443 */ 3444 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3445 struct nfs4_state *state) 3446 { 3447 __be32 seqid_open; 3448 u32 dst_seqid; 3449 int seq; 3450 3451 for (;;) { 3452 if (!nfs4_valid_open_stateid(state)) 3453 break; 3454 seq = read_seqbegin(&state->seqlock); 3455 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3456 nfs4_stateid_copy(dst, &state->open_stateid); 3457 if (read_seqretry(&state->seqlock, seq)) 3458 continue; 3459 break; 3460 } 3461 seqid_open = state->open_stateid.seqid; 3462 if (read_seqretry(&state->seqlock, seq)) 3463 continue; 3464 3465 dst_seqid = be32_to_cpu(dst->seqid); 3466 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3467 dst->seqid = seqid_open; 3468 break; 3469 } 3470 } 3471 3472 /* 3473 * Update the seqid of an open stateid after receiving 3474 * NFS4ERR_OLD_STATEID 3475 */ 3476 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3477 struct nfs4_state *state) 3478 { 3479 __be32 seqid_open; 3480 u32 dst_seqid; 3481 bool ret; 3482 int seq, status = -EAGAIN; 3483 DEFINE_WAIT(wait); 3484 3485 for (;;) { 3486 ret = false; 3487 if (!nfs4_valid_open_stateid(state)) 3488 break; 3489 seq = read_seqbegin(&state->seqlock); 3490 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3491 if (read_seqretry(&state->seqlock, seq)) 3492 continue; 3493 break; 3494 } 3495 3496 write_seqlock(&state->seqlock); 3497 seqid_open = state->open_stateid.seqid; 3498 3499 dst_seqid = be32_to_cpu(dst->seqid); 3500 3501 /* Did another OPEN bump the state's seqid? try again: */ 3502 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3503 dst->seqid = seqid_open; 3504 write_sequnlock(&state->seqlock); 3505 ret = true; 3506 break; 3507 } 3508 3509 /* server says we're behind but we haven't seen the update yet */ 3510 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3511 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3512 write_sequnlock(&state->seqlock); 3513 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3514 3515 if (fatal_signal_pending(current)) 3516 status = -EINTR; 3517 else 3518 if (schedule_timeout(5*HZ) != 0) 3519 status = 0; 3520 3521 finish_wait(&state->waitq, &wait); 3522 3523 if (!status) 3524 continue; 3525 if (status == -EINTR) 3526 break; 3527 3528 /* we slept the whole 5 seconds, we must have lost a seqid */ 3529 dst->seqid = cpu_to_be32(dst_seqid + 1); 3530 ret = true; 3531 break; 3532 } 3533 3534 return ret; 3535 } 3536 3537 struct nfs4_closedata { 3538 struct inode *inode; 3539 struct nfs4_state *state; 3540 struct nfs_closeargs arg; 3541 struct nfs_closeres res; 3542 struct { 3543 struct nfs4_layoutreturn_args arg; 3544 struct nfs4_layoutreturn_res res; 3545 struct nfs4_xdr_opaque_data ld_private; 3546 u32 roc_barrier; 3547 bool roc; 3548 } lr; 3549 struct nfs_fattr fattr; 3550 unsigned long timestamp; 3551 }; 3552 3553 static void nfs4_free_closedata(void *data) 3554 { 3555 struct nfs4_closedata *calldata = data; 3556 struct nfs4_state_owner *sp = calldata->state->owner; 3557 struct super_block *sb = calldata->state->inode->i_sb; 3558 3559 if (calldata->lr.roc) 3560 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3561 calldata->res.lr_ret); 3562 nfs4_put_open_state(calldata->state); 3563 nfs_free_seqid(calldata->arg.seqid); 3564 nfs4_put_state_owner(sp); 3565 nfs_sb_deactive(sb); 3566 kfree(calldata); 3567 } 3568 3569 static void nfs4_close_done(struct rpc_task *task, void *data) 3570 { 3571 struct nfs4_closedata *calldata = data; 3572 struct nfs4_state *state = calldata->state; 3573 struct nfs_server *server = NFS_SERVER(calldata->inode); 3574 nfs4_stateid *res_stateid = NULL; 3575 struct nfs4_exception exception = { 3576 .state = state, 3577 .inode = calldata->inode, 3578 .stateid = &calldata->arg.stateid, 3579 }; 3580 3581 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3582 return; 3583 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3584 3585 /* Handle Layoutreturn errors */ 3586 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3587 &calldata->res.lr_ret) == -EAGAIN) 3588 goto out_restart; 3589 3590 /* hmm. we are done with the inode, and in the process of freeing 3591 * the state_owner. we keep this around to process errors 3592 */ 3593 switch (task->tk_status) { 3594 case 0: 3595 res_stateid = &calldata->res.stateid; 3596 renew_lease(server, calldata->timestamp); 3597 break; 3598 case -NFS4ERR_ACCESS: 3599 if (calldata->arg.bitmask != NULL) { 3600 calldata->arg.bitmask = NULL; 3601 calldata->res.fattr = NULL; 3602 goto out_restart; 3603 3604 } 3605 break; 3606 case -NFS4ERR_OLD_STATEID: 3607 /* Did we race with OPEN? */ 3608 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3609 state)) 3610 goto out_restart; 3611 goto out_release; 3612 case -NFS4ERR_ADMIN_REVOKED: 3613 case -NFS4ERR_STALE_STATEID: 3614 case -NFS4ERR_EXPIRED: 3615 nfs4_free_revoked_stateid(server, 3616 &calldata->arg.stateid, 3617 task->tk_msg.rpc_cred); 3618 fallthrough; 3619 case -NFS4ERR_BAD_STATEID: 3620 if (calldata->arg.fmode == 0) 3621 break; 3622 fallthrough; 3623 default: 3624 task->tk_status = nfs4_async_handle_exception(task, 3625 server, task->tk_status, &exception); 3626 if (exception.retry) 3627 goto out_restart; 3628 } 3629 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3630 res_stateid, calldata->arg.fmode); 3631 out_release: 3632 task->tk_status = 0; 3633 nfs_release_seqid(calldata->arg.seqid); 3634 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3635 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3636 return; 3637 out_restart: 3638 task->tk_status = 0; 3639 rpc_restart_call_prepare(task); 3640 goto out_release; 3641 } 3642 3643 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3644 { 3645 struct nfs4_closedata *calldata = data; 3646 struct nfs4_state *state = calldata->state; 3647 struct inode *inode = calldata->inode; 3648 struct nfs_server *server = NFS_SERVER(inode); 3649 struct pnfs_layout_hdr *lo; 3650 bool is_rdonly, is_wronly, is_rdwr; 3651 int call_close = 0; 3652 3653 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3654 goto out_wait; 3655 3656 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3657 spin_lock(&state->owner->so_lock); 3658 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3659 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3660 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3661 /* Calculate the change in open mode */ 3662 calldata->arg.fmode = 0; 3663 if (state->n_rdwr == 0) { 3664 if (state->n_rdonly == 0) 3665 call_close |= is_rdonly; 3666 else if (is_rdonly) 3667 calldata->arg.fmode |= FMODE_READ; 3668 if (state->n_wronly == 0) 3669 call_close |= is_wronly; 3670 else if (is_wronly) 3671 calldata->arg.fmode |= FMODE_WRITE; 3672 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3673 call_close |= is_rdwr; 3674 } else if (is_rdwr) 3675 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3676 3677 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3678 if (!nfs4_valid_open_stateid(state)) 3679 call_close = 0; 3680 spin_unlock(&state->owner->so_lock); 3681 3682 if (!call_close) { 3683 /* Note: exit _without_ calling nfs4_close_done */ 3684 goto out_no_action; 3685 } 3686 3687 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3688 nfs_release_seqid(calldata->arg.seqid); 3689 goto out_wait; 3690 } 3691 3692 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3693 if (lo && !pnfs_layout_is_valid(lo)) { 3694 calldata->arg.lr_args = NULL; 3695 calldata->res.lr_res = NULL; 3696 } 3697 3698 if (calldata->arg.fmode == 0) 3699 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3700 3701 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3702 /* Close-to-open cache consistency revalidation */ 3703 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3704 nfs4_bitmask_set(calldata->arg.bitmask_store, 3705 server->cache_consistency_bitmask, 3706 inode, 0); 3707 calldata->arg.bitmask = calldata->arg.bitmask_store; 3708 } else 3709 calldata->arg.bitmask = NULL; 3710 } 3711 3712 calldata->arg.share_access = 3713 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3714 calldata->arg.fmode, 0); 3715 3716 if (calldata->res.fattr == NULL) 3717 calldata->arg.bitmask = NULL; 3718 else if (calldata->arg.bitmask == NULL) 3719 calldata->res.fattr = NULL; 3720 calldata->timestamp = jiffies; 3721 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3722 &calldata->arg.seq_args, 3723 &calldata->res.seq_res, 3724 task) != 0) 3725 nfs_release_seqid(calldata->arg.seqid); 3726 return; 3727 out_no_action: 3728 task->tk_action = NULL; 3729 out_wait: 3730 nfs4_sequence_done(task, &calldata->res.seq_res); 3731 } 3732 3733 static const struct rpc_call_ops nfs4_close_ops = { 3734 .rpc_call_prepare = nfs4_close_prepare, 3735 .rpc_call_done = nfs4_close_done, 3736 .rpc_release = nfs4_free_closedata, 3737 }; 3738 3739 /* 3740 * It is possible for data to be read/written from a mem-mapped file 3741 * after the sys_close call (which hits the vfs layer as a flush). 3742 * This means that we can't safely call nfsv4 close on a file until 3743 * the inode is cleared. This in turn means that we are not good 3744 * NFSv4 citizens - we do not indicate to the server to update the file's 3745 * share state even when we are done with one of the three share 3746 * stateid's in the inode. 3747 * 3748 * NOTE: Caller must be holding the sp->so_owner semaphore! 3749 */ 3750 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3751 { 3752 struct nfs_server *server = NFS_SERVER(state->inode); 3753 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3754 struct nfs4_closedata *calldata; 3755 struct nfs4_state_owner *sp = state->owner; 3756 struct rpc_task *task; 3757 struct rpc_message msg = { 3758 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3759 .rpc_cred = state->owner->so_cred, 3760 }; 3761 struct rpc_task_setup task_setup_data = { 3762 .rpc_client = server->client, 3763 .rpc_message = &msg, 3764 .callback_ops = &nfs4_close_ops, 3765 .workqueue = nfsiod_workqueue, 3766 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3767 }; 3768 int status = -ENOMEM; 3769 3770 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3771 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3772 3773 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3774 &task_setup_data.rpc_client, &msg); 3775 3776 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3777 if (calldata == NULL) 3778 goto out; 3779 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3780 calldata->inode = state->inode; 3781 calldata->state = state; 3782 calldata->arg.fh = NFS_FH(state->inode); 3783 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3784 goto out_free_calldata; 3785 /* Serialization for the sequence id */ 3786 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3787 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3788 if (IS_ERR(calldata->arg.seqid)) 3789 goto out_free_calldata; 3790 nfs_fattr_init(&calldata->fattr); 3791 calldata->arg.fmode = 0; 3792 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3793 calldata->res.fattr = &calldata->fattr; 3794 calldata->res.seqid = calldata->arg.seqid; 3795 calldata->res.server = server; 3796 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3797 calldata->lr.roc = pnfs_roc(state->inode, 3798 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3799 if (calldata->lr.roc) { 3800 calldata->arg.lr_args = &calldata->lr.arg; 3801 calldata->res.lr_res = &calldata->lr.res; 3802 } 3803 nfs_sb_active(calldata->inode->i_sb); 3804 3805 msg.rpc_argp = &calldata->arg; 3806 msg.rpc_resp = &calldata->res; 3807 task_setup_data.callback_data = calldata; 3808 task = rpc_run_task(&task_setup_data); 3809 if (IS_ERR(task)) 3810 return PTR_ERR(task); 3811 status = 0; 3812 if (wait) 3813 status = rpc_wait_for_completion_task(task); 3814 rpc_put_task(task); 3815 return status; 3816 out_free_calldata: 3817 kfree(calldata); 3818 out: 3819 nfs4_put_open_state(state); 3820 nfs4_put_state_owner(sp); 3821 return status; 3822 } 3823 3824 static struct inode * 3825 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3826 int open_flags, struct iattr *attr, int *opened) 3827 { 3828 struct nfs4_state *state; 3829 struct nfs4_label l, *label; 3830 3831 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3832 3833 /* Protect against concurrent sillydeletes */ 3834 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3835 3836 nfs4_label_release_security(label); 3837 3838 if (IS_ERR(state)) 3839 return ERR_CAST(state); 3840 return state->inode; 3841 } 3842 3843 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3844 { 3845 if (ctx->state == NULL) 3846 return; 3847 if (is_sync) 3848 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3849 else 3850 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3851 } 3852 3853 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3854 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3855 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3856 3857 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3858 { 3859 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3860 struct nfs4_server_caps_arg args = { 3861 .fhandle = fhandle, 3862 .bitmask = bitmask, 3863 }; 3864 struct nfs4_server_caps_res res = {}; 3865 struct rpc_message msg = { 3866 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3867 .rpc_argp = &args, 3868 .rpc_resp = &res, 3869 }; 3870 int status; 3871 int i; 3872 3873 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3874 FATTR4_WORD0_FH_EXPIRE_TYPE | 3875 FATTR4_WORD0_LINK_SUPPORT | 3876 FATTR4_WORD0_SYMLINK_SUPPORT | 3877 FATTR4_WORD0_ACLSUPPORT | 3878 FATTR4_WORD0_CASE_INSENSITIVE | 3879 FATTR4_WORD0_CASE_PRESERVING; 3880 if (minorversion) 3881 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3882 3883 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3884 if (status == 0) { 3885 /* Sanity check the server answers */ 3886 switch (minorversion) { 3887 case 0: 3888 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3889 res.attr_bitmask[2] = 0; 3890 break; 3891 case 1: 3892 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3893 break; 3894 case 2: 3895 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3896 } 3897 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3898 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3899 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3900 server->fattr_valid = NFS_ATTR_FATTR_V4; 3901 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3902 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3903 server->caps |= NFS_CAP_ACLS; 3904 if (res.has_links != 0) 3905 server->caps |= NFS_CAP_HARDLINKS; 3906 if (res.has_symlinks != 0) 3907 server->caps |= NFS_CAP_SYMLINKS; 3908 if (res.case_insensitive) 3909 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3910 if (res.case_preserving) 3911 server->caps |= NFS_CAP_CASE_PRESERVING; 3912 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3913 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3914 server->caps |= NFS_CAP_SECURITY_LABEL; 3915 #endif 3916 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3917 server->caps |= NFS_CAP_FS_LOCATIONS; 3918 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3919 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3920 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3921 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3922 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3923 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3924 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3925 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3926 NFS_ATTR_FATTR_OWNER_NAME); 3927 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3928 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3929 NFS_ATTR_FATTR_GROUP_NAME); 3930 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3931 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3932 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3933 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3934 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3935 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3936 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3937 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3938 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3939 sizeof(server->attr_bitmask)); 3940 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3941 3942 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3943 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3944 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3945 server->cache_consistency_bitmask[2] = 0; 3946 3947 /* Avoid a regression due to buggy server */ 3948 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3949 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3950 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3951 sizeof(server->exclcreat_bitmask)); 3952 3953 server->acl_bitmask = res.acl_bitmask; 3954 server->fh_expire_type = res.fh_expire_type; 3955 } 3956 3957 return status; 3958 } 3959 3960 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3961 { 3962 struct nfs4_exception exception = { 3963 .interruptible = true, 3964 }; 3965 int err; 3966 3967 nfs4_server_set_init_caps(server); 3968 do { 3969 err = nfs4_handle_exception(server, 3970 _nfs4_server_capabilities(server, fhandle), 3971 &exception); 3972 } while (exception.retry); 3973 return err; 3974 } 3975 3976 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3977 struct nfs_client *clp, 3978 struct nfs_server *server) 3979 { 3980 int i; 3981 3982 for (i = 0; i < location->nservers; i++) { 3983 struct nfs4_string *srv_loc = &location->servers[i]; 3984 struct sockaddr_storage addr; 3985 size_t addrlen; 3986 struct xprt_create xprt_args = { 3987 .ident = 0, 3988 .net = clp->cl_net, 3989 }; 3990 struct nfs4_add_xprt_data xprtdata = { 3991 .clp = clp, 3992 }; 3993 struct rpc_add_xprt_test rpcdata = { 3994 .add_xprt_test = clp->cl_mvops->session_trunk, 3995 .data = &xprtdata, 3996 }; 3997 char *servername = NULL; 3998 3999 if (!srv_loc->len) 4000 continue; 4001 4002 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 4003 &addr, sizeof(addr), 4004 clp->cl_net, server->port); 4005 if (!addrlen) 4006 return; 4007 xprt_args.dstaddr = (struct sockaddr *)&addr; 4008 xprt_args.addrlen = addrlen; 4009 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 4010 if (!servername) 4011 return; 4012 memcpy(servername, srv_loc->data, srv_loc->len); 4013 servername[srv_loc->len] = '\0'; 4014 xprt_args.servername = servername; 4015 4016 xprtdata.cred = nfs4_get_clid_cred(clp); 4017 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 4018 rpc_clnt_setup_test_and_add_xprt, 4019 &rpcdata); 4020 if (xprtdata.cred) 4021 put_cred(xprtdata.cred); 4022 kfree(servername); 4023 } 4024 } 4025 4026 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1, 4027 struct nfs4_pathname *path2) 4028 { 4029 int i; 4030 4031 if (path1->ncomponents != path2->ncomponents) 4032 return false; 4033 for (i = 0; i < path1->ncomponents; i++) { 4034 if (path1->components[i].len != path2->components[i].len) 4035 return false; 4036 if (memcmp(path1->components[i].data, path2->components[i].data, 4037 path1->components[i].len)) 4038 return false; 4039 } 4040 return true; 4041 } 4042 4043 static int _nfs4_discover_trunking(struct nfs_server *server, 4044 struct nfs_fh *fhandle) 4045 { 4046 struct nfs4_fs_locations *locations = NULL; 4047 struct page *page; 4048 const struct cred *cred; 4049 struct nfs_client *clp = server->nfs_client; 4050 const struct nfs4_state_maintenance_ops *ops = 4051 clp->cl_mvops->state_renewal_ops; 4052 int status = -ENOMEM, i; 4053 4054 cred = ops->get_state_renewal_cred(clp); 4055 if (cred == NULL) { 4056 cred = nfs4_get_clid_cred(clp); 4057 if (cred == NULL) 4058 return -ENOKEY; 4059 } 4060 4061 page = alloc_page(GFP_KERNEL); 4062 if (!page) 4063 goto out_put_cred; 4064 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4065 if (!locations) 4066 goto out_free; 4067 locations->fattr = nfs_alloc_fattr(); 4068 if (!locations->fattr) 4069 goto out_free_2; 4070 4071 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4072 cred); 4073 if (status) 4074 goto out_free_3; 4075 4076 for (i = 0; i < locations->nlocations; i++) { 4077 if (!_is_same_nfs4_pathname(&locations->fs_path, 4078 &locations->locations[i].rootpath)) 4079 continue; 4080 test_fs_location_for_trunking(&locations->locations[i], clp, 4081 server); 4082 } 4083 out_free_3: 4084 kfree(locations->fattr); 4085 out_free_2: 4086 kfree(locations); 4087 out_free: 4088 __free_page(page); 4089 out_put_cred: 4090 put_cred(cred); 4091 return status; 4092 } 4093 4094 static int nfs4_discover_trunking(struct nfs_server *server, 4095 struct nfs_fh *fhandle) 4096 { 4097 struct nfs4_exception exception = { 4098 .interruptible = true, 4099 }; 4100 struct nfs_client *clp = server->nfs_client; 4101 int err = 0; 4102 4103 if (!nfs4_has_session(clp)) 4104 goto out; 4105 do { 4106 err = nfs4_handle_exception(server, 4107 _nfs4_discover_trunking(server, fhandle), 4108 &exception); 4109 } while (exception.retry); 4110 out: 4111 return err; 4112 } 4113 4114 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4115 struct nfs_fsinfo *info) 4116 { 4117 u32 bitmask[3]; 4118 struct nfs4_lookup_root_arg args = { 4119 .bitmask = bitmask, 4120 }; 4121 struct nfs4_lookup_res res = { 4122 .server = server, 4123 .fattr = info->fattr, 4124 .fh = fhandle, 4125 }; 4126 struct rpc_message msg = { 4127 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4128 .rpc_argp = &args, 4129 .rpc_resp = &res, 4130 }; 4131 4132 bitmask[0] = nfs4_fattr_bitmap[0]; 4133 bitmask[1] = nfs4_fattr_bitmap[1]; 4134 /* 4135 * Process the label in the upcoming getfattr 4136 */ 4137 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4138 4139 nfs_fattr_init(info->fattr); 4140 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4141 } 4142 4143 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4144 struct nfs_fsinfo *info) 4145 { 4146 struct nfs4_exception exception = { 4147 .interruptible = true, 4148 }; 4149 int err; 4150 do { 4151 err = _nfs4_lookup_root(server, fhandle, info); 4152 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4153 switch (err) { 4154 case 0: 4155 case -NFS4ERR_WRONGSEC: 4156 goto out; 4157 default: 4158 err = nfs4_handle_exception(server, err, &exception); 4159 } 4160 } while (exception.retry); 4161 out: 4162 return err; 4163 } 4164 4165 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4166 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4167 { 4168 struct rpc_auth_create_args auth_args = { 4169 .pseudoflavor = flavor, 4170 }; 4171 struct rpc_auth *auth; 4172 4173 auth = rpcauth_create(&auth_args, server->client); 4174 if (IS_ERR(auth)) 4175 return -EACCES; 4176 return nfs4_lookup_root(server, fhandle, info); 4177 } 4178 4179 /* 4180 * Retry pseudoroot lookup with various security flavors. We do this when: 4181 * 4182 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4183 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4184 * 4185 * Returns zero on success, or a negative NFS4ERR value, or a 4186 * negative errno value. 4187 */ 4188 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4189 struct nfs_fsinfo *info) 4190 { 4191 /* Per 3530bis 15.33.5 */ 4192 static const rpc_authflavor_t flav_array[] = { 4193 RPC_AUTH_GSS_KRB5P, 4194 RPC_AUTH_GSS_KRB5I, 4195 RPC_AUTH_GSS_KRB5, 4196 RPC_AUTH_UNIX, /* courtesy */ 4197 RPC_AUTH_NULL, 4198 }; 4199 int status = -EPERM; 4200 size_t i; 4201 4202 if (server->auth_info.flavor_len > 0) { 4203 /* try each flavor specified by user */ 4204 for (i = 0; i < server->auth_info.flavor_len; i++) { 4205 status = nfs4_lookup_root_sec(server, fhandle, info, 4206 server->auth_info.flavors[i]); 4207 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4208 continue; 4209 break; 4210 } 4211 } else { 4212 /* no flavors specified by user, try default list */ 4213 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4214 status = nfs4_lookup_root_sec(server, fhandle, info, 4215 flav_array[i]); 4216 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4217 continue; 4218 break; 4219 } 4220 } 4221 4222 /* 4223 * -EACCES could mean that the user doesn't have correct permissions 4224 * to access the mount. It could also mean that we tried to mount 4225 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4226 * existing mount programs don't handle -EACCES very well so it should 4227 * be mapped to -EPERM instead. 4228 */ 4229 if (status == -EACCES) 4230 status = -EPERM; 4231 return status; 4232 } 4233 4234 /** 4235 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4236 * @server: initialized nfs_server handle 4237 * @fhandle: we fill in the pseudo-fs root file handle 4238 * @info: we fill in an FSINFO struct 4239 * @auth_probe: probe the auth flavours 4240 * 4241 * Returns zero on success, or a negative errno. 4242 */ 4243 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4244 struct nfs_fsinfo *info, 4245 bool auth_probe) 4246 { 4247 int status = 0; 4248 4249 if (!auth_probe) 4250 status = nfs4_lookup_root(server, fhandle, info); 4251 4252 if (auth_probe || status == NFS4ERR_WRONGSEC) 4253 status = server->nfs_client->cl_mvops->find_root_sec(server, 4254 fhandle, info); 4255 4256 if (status == 0) 4257 status = nfs4_server_capabilities(server, fhandle); 4258 if (status == 0) 4259 status = nfs4_do_fsinfo(server, fhandle, info); 4260 4261 return nfs4_map_errors(status); 4262 } 4263 4264 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4265 struct nfs_fsinfo *info) 4266 { 4267 int error; 4268 struct nfs_fattr *fattr = info->fattr; 4269 4270 error = nfs4_server_capabilities(server, mntfh); 4271 if (error < 0) { 4272 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4273 return error; 4274 } 4275 4276 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4277 if (error < 0) { 4278 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4279 goto out; 4280 } 4281 4282 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4283 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4284 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4285 4286 out: 4287 return error; 4288 } 4289 4290 /* 4291 * Get locations and (maybe) other attributes of a referral. 4292 * Note that we'll actually follow the referral later when 4293 * we detect fsid mismatch in inode revalidation 4294 */ 4295 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4296 const struct qstr *name, struct nfs_fattr *fattr, 4297 struct nfs_fh *fhandle) 4298 { 4299 int status = -ENOMEM; 4300 struct page *page = NULL; 4301 struct nfs4_fs_locations *locations = NULL; 4302 4303 page = alloc_page(GFP_KERNEL); 4304 if (page == NULL) 4305 goto out; 4306 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4307 if (locations == NULL) 4308 goto out; 4309 4310 locations->fattr = fattr; 4311 4312 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4313 if (status != 0) 4314 goto out; 4315 4316 /* 4317 * If the fsid didn't change, this is a migration event, not a 4318 * referral. Cause us to drop into the exception handler, which 4319 * will kick off migration recovery. 4320 */ 4321 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4322 dprintk("%s: server did not return a different fsid for" 4323 " a referral at %s\n", __func__, name->name); 4324 status = -NFS4ERR_MOVED; 4325 goto out; 4326 } 4327 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4328 nfs_fixup_referral_attributes(fattr); 4329 memset(fhandle, 0, sizeof(struct nfs_fh)); 4330 out: 4331 if (page) 4332 __free_page(page); 4333 kfree(locations); 4334 return status; 4335 } 4336 4337 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4338 struct nfs_fattr *fattr, struct inode *inode) 4339 { 4340 __u32 bitmask[NFS4_BITMASK_SZ]; 4341 struct nfs4_getattr_arg args = { 4342 .fh = fhandle, 4343 .bitmask = bitmask, 4344 }; 4345 struct nfs4_getattr_res res = { 4346 .fattr = fattr, 4347 .server = server, 4348 }; 4349 struct rpc_message msg = { 4350 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4351 .rpc_argp = &args, 4352 .rpc_resp = &res, 4353 }; 4354 unsigned short task_flags = 0; 4355 4356 if (nfs4_has_session(server->nfs_client)) 4357 task_flags = RPC_TASK_MOVEABLE; 4358 4359 /* Is this is an attribute revalidation, subject to softreval? */ 4360 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4361 task_flags |= RPC_TASK_TIMEOUT; 4362 4363 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4364 nfs_fattr_init(fattr); 4365 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4366 return nfs4_do_call_sync(server->client, server, &msg, 4367 &args.seq_args, &res.seq_res, task_flags); 4368 } 4369 4370 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4371 struct nfs_fattr *fattr, struct inode *inode) 4372 { 4373 struct nfs4_exception exception = { 4374 .interruptible = true, 4375 }; 4376 int err; 4377 do { 4378 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4379 trace_nfs4_getattr(server, fhandle, fattr, err); 4380 err = nfs4_handle_exception(server, err, 4381 &exception); 4382 } while (exception.retry); 4383 return err; 4384 } 4385 4386 /* 4387 * The file is not closed if it is opened due to the a request to change 4388 * the size of the file. The open call will not be needed once the 4389 * VFS layer lookup-intents are implemented. 4390 * 4391 * Close is called when the inode is destroyed. 4392 * If we haven't opened the file for O_WRONLY, we 4393 * need to in the size_change case to obtain a stateid. 4394 * 4395 * Got race? 4396 * Because OPEN is always done by name in nfsv4, it is 4397 * possible that we opened a different file by the same 4398 * name. We can recognize this race condition, but we 4399 * can't do anything about it besides returning an error. 4400 * 4401 * This will be fixed with VFS changes (lookup-intent). 4402 */ 4403 static int 4404 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4405 struct iattr *sattr) 4406 { 4407 struct inode *inode = d_inode(dentry); 4408 const struct cred *cred = NULL; 4409 struct nfs_open_context *ctx = NULL; 4410 int status; 4411 4412 if (pnfs_ld_layoutret_on_setattr(inode) && 4413 sattr->ia_valid & ATTR_SIZE && 4414 sattr->ia_size < i_size_read(inode)) 4415 pnfs_commit_and_return_layout(inode); 4416 4417 nfs_fattr_init(fattr); 4418 4419 /* Deal with open(O_TRUNC) */ 4420 if (sattr->ia_valid & ATTR_OPEN) 4421 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4422 4423 /* Optimization: if the end result is no change, don't RPC */ 4424 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4425 return 0; 4426 4427 /* Search for an existing open(O_WRITE) file */ 4428 if (sattr->ia_valid & ATTR_FILE) { 4429 4430 ctx = nfs_file_open_context(sattr->ia_file); 4431 if (ctx) 4432 cred = ctx->cred; 4433 } 4434 4435 /* Return any delegations if we're going to change ACLs */ 4436 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4437 nfs4_inode_make_writeable(inode); 4438 4439 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4440 if (status == 0) { 4441 nfs_setattr_update_inode(inode, sattr, fattr); 4442 nfs_setsecurity(inode, fattr); 4443 } 4444 return status; 4445 } 4446 4447 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4448 struct dentry *dentry, struct nfs_fh *fhandle, 4449 struct nfs_fattr *fattr) 4450 { 4451 struct nfs_server *server = NFS_SERVER(dir); 4452 int status; 4453 struct nfs4_lookup_arg args = { 4454 .bitmask = server->attr_bitmask, 4455 .dir_fh = NFS_FH(dir), 4456 .name = &dentry->d_name, 4457 }; 4458 struct nfs4_lookup_res res = { 4459 .server = server, 4460 .fattr = fattr, 4461 .fh = fhandle, 4462 }; 4463 struct rpc_message msg = { 4464 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4465 .rpc_argp = &args, 4466 .rpc_resp = &res, 4467 }; 4468 unsigned short task_flags = 0; 4469 4470 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4471 task_flags = RPC_TASK_MOVEABLE; 4472 4473 /* Is this is an attribute revalidation, subject to softreval? */ 4474 if (nfs_lookup_is_soft_revalidate(dentry)) 4475 task_flags |= RPC_TASK_TIMEOUT; 4476 4477 args.bitmask = nfs4_bitmask(server, fattr->label); 4478 4479 nfs_fattr_init(fattr); 4480 4481 dprintk("NFS call lookup %pd2\n", dentry); 4482 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4483 status = nfs4_do_call_sync(clnt, server, &msg, 4484 &args.seq_args, &res.seq_res, task_flags); 4485 dprintk("NFS reply lookup: %d\n", status); 4486 return status; 4487 } 4488 4489 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4490 { 4491 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4492 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4493 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4494 fattr->nlink = 2; 4495 } 4496 4497 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4498 struct dentry *dentry, struct nfs_fh *fhandle, 4499 struct nfs_fattr *fattr) 4500 { 4501 struct nfs4_exception exception = { 4502 .interruptible = true, 4503 }; 4504 struct rpc_clnt *client = *clnt; 4505 const struct qstr *name = &dentry->d_name; 4506 int err; 4507 do { 4508 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4509 trace_nfs4_lookup(dir, name, err); 4510 switch (err) { 4511 case -NFS4ERR_BADNAME: 4512 err = -ENOENT; 4513 goto out; 4514 case -NFS4ERR_MOVED: 4515 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4516 if (err == -NFS4ERR_MOVED) 4517 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4518 goto out; 4519 case -NFS4ERR_WRONGSEC: 4520 err = -EPERM; 4521 if (client != *clnt) 4522 goto out; 4523 client = nfs4_negotiate_security(client, dir, name); 4524 if (IS_ERR(client)) 4525 return PTR_ERR(client); 4526 4527 exception.retry = 1; 4528 break; 4529 default: 4530 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4531 } 4532 } while (exception.retry); 4533 4534 out: 4535 if (err == 0) 4536 *clnt = client; 4537 else if (client != *clnt) 4538 rpc_shutdown_client(client); 4539 4540 return err; 4541 } 4542 4543 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4544 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4545 { 4546 int status; 4547 struct rpc_clnt *client = NFS_CLIENT(dir); 4548 4549 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4550 if (client != NFS_CLIENT(dir)) { 4551 rpc_shutdown_client(client); 4552 nfs_fixup_secinfo_attributes(fattr); 4553 } 4554 return status; 4555 } 4556 4557 struct rpc_clnt * 4558 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4559 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4560 { 4561 struct rpc_clnt *client = NFS_CLIENT(dir); 4562 int status; 4563 4564 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4565 if (status < 0) 4566 return ERR_PTR(status); 4567 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4568 } 4569 4570 static int _nfs4_proc_lookupp(struct inode *inode, 4571 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4572 { 4573 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4574 struct nfs_server *server = NFS_SERVER(inode); 4575 int status; 4576 struct nfs4_lookupp_arg args = { 4577 .bitmask = server->attr_bitmask, 4578 .fh = NFS_FH(inode), 4579 }; 4580 struct nfs4_lookupp_res res = { 4581 .server = server, 4582 .fattr = fattr, 4583 .fh = fhandle, 4584 }; 4585 struct rpc_message msg = { 4586 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4587 .rpc_argp = &args, 4588 .rpc_resp = &res, 4589 }; 4590 unsigned short task_flags = 0; 4591 4592 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4593 task_flags |= RPC_TASK_TIMEOUT; 4594 4595 args.bitmask = nfs4_bitmask(server, fattr->label); 4596 4597 nfs_fattr_init(fattr); 4598 4599 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4600 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4601 &res.seq_res, task_flags); 4602 dprintk("NFS reply lookupp: %d\n", status); 4603 return status; 4604 } 4605 4606 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4607 struct nfs_fattr *fattr) 4608 { 4609 struct nfs4_exception exception = { 4610 .interruptible = true, 4611 }; 4612 int err; 4613 do { 4614 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4615 trace_nfs4_lookupp(inode, err); 4616 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4617 &exception); 4618 } while (exception.retry); 4619 return err; 4620 } 4621 4622 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4623 const struct cred *cred) 4624 { 4625 struct nfs_server *server = NFS_SERVER(inode); 4626 struct nfs4_accessargs args = { 4627 .fh = NFS_FH(inode), 4628 .access = entry->mask, 4629 }; 4630 struct nfs4_accessres res = { 4631 .server = server, 4632 }; 4633 struct rpc_message msg = { 4634 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4635 .rpc_argp = &args, 4636 .rpc_resp = &res, 4637 .rpc_cred = cred, 4638 }; 4639 int status = 0; 4640 4641 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4642 res.fattr = nfs_alloc_fattr(); 4643 if (res.fattr == NULL) 4644 return -ENOMEM; 4645 args.bitmask = server->cache_consistency_bitmask; 4646 } 4647 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4648 if (!status) { 4649 nfs_access_set_mask(entry, res.access); 4650 if (res.fattr) 4651 nfs_refresh_inode(inode, res.fattr); 4652 } 4653 nfs_free_fattr(res.fattr); 4654 return status; 4655 } 4656 4657 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4658 const struct cred *cred) 4659 { 4660 struct nfs4_exception exception = { 4661 .interruptible = true, 4662 }; 4663 int err; 4664 do { 4665 err = _nfs4_proc_access(inode, entry, cred); 4666 trace_nfs4_access(inode, err); 4667 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4668 &exception); 4669 } while (exception.retry); 4670 return err; 4671 } 4672 4673 /* 4674 * TODO: For the time being, we don't try to get any attributes 4675 * along with any of the zero-copy operations READ, READDIR, 4676 * READLINK, WRITE. 4677 * 4678 * In the case of the first three, we want to put the GETATTR 4679 * after the read-type operation -- this is because it is hard 4680 * to predict the length of a GETATTR response in v4, and thus 4681 * align the READ data correctly. This means that the GETATTR 4682 * may end up partially falling into the page cache, and we should 4683 * shift it into the 'tail' of the xdr_buf before processing. 4684 * To do this efficiently, we need to know the total length 4685 * of data received, which doesn't seem to be available outside 4686 * of the RPC layer. 4687 * 4688 * In the case of WRITE, we also want to put the GETATTR after 4689 * the operation -- in this case because we want to make sure 4690 * we get the post-operation mtime and size. 4691 * 4692 * Both of these changes to the XDR layer would in fact be quite 4693 * minor, but I decided to leave them for a subsequent patch. 4694 */ 4695 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4696 unsigned int pgbase, unsigned int pglen) 4697 { 4698 struct nfs4_readlink args = { 4699 .fh = NFS_FH(inode), 4700 .pgbase = pgbase, 4701 .pglen = pglen, 4702 .pages = &page, 4703 }; 4704 struct nfs4_readlink_res res; 4705 struct rpc_message msg = { 4706 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4707 .rpc_argp = &args, 4708 .rpc_resp = &res, 4709 }; 4710 4711 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4712 } 4713 4714 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4715 unsigned int pgbase, unsigned int pglen) 4716 { 4717 struct nfs4_exception exception = { 4718 .interruptible = true, 4719 }; 4720 int err; 4721 do { 4722 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4723 trace_nfs4_readlink(inode, err); 4724 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4725 &exception); 4726 } while (exception.retry); 4727 return err; 4728 } 4729 4730 /* 4731 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4732 */ 4733 static int 4734 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4735 int flags) 4736 { 4737 struct nfs_server *server = NFS_SERVER(dir); 4738 struct nfs4_label l, *ilabel; 4739 struct nfs_open_context *ctx; 4740 struct nfs4_state *state; 4741 int status = 0; 4742 4743 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4744 if (IS_ERR(ctx)) 4745 return PTR_ERR(ctx); 4746 4747 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4748 4749 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4750 sattr->ia_mode &= ~current_umask(); 4751 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4752 if (IS_ERR(state)) { 4753 status = PTR_ERR(state); 4754 goto out; 4755 } 4756 out: 4757 nfs4_label_release_security(ilabel); 4758 put_nfs_open_context(ctx); 4759 return status; 4760 } 4761 4762 static int 4763 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4764 { 4765 struct nfs_server *server = NFS_SERVER(dir); 4766 struct nfs_removeargs args = { 4767 .fh = NFS_FH(dir), 4768 .name = *name, 4769 }; 4770 struct nfs_removeres res = { 4771 .server = server, 4772 }; 4773 struct rpc_message msg = { 4774 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4775 .rpc_argp = &args, 4776 .rpc_resp = &res, 4777 }; 4778 unsigned long timestamp = jiffies; 4779 int status; 4780 4781 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4782 if (status == 0) { 4783 spin_lock(&dir->i_lock); 4784 /* Removing a directory decrements nlink in the parent */ 4785 if (ftype == NF4DIR && dir->i_nlink > 2) 4786 nfs4_dec_nlink_locked(dir); 4787 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4788 NFS_INO_INVALID_DATA); 4789 spin_unlock(&dir->i_lock); 4790 } 4791 return status; 4792 } 4793 4794 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4795 { 4796 struct nfs4_exception exception = { 4797 .interruptible = true, 4798 }; 4799 struct inode *inode = d_inode(dentry); 4800 int err; 4801 4802 if (inode) { 4803 if (inode->i_nlink == 1) 4804 nfs4_inode_return_delegation(inode); 4805 else 4806 nfs4_inode_make_writeable(inode); 4807 } 4808 do { 4809 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4810 trace_nfs4_remove(dir, &dentry->d_name, err); 4811 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4812 &exception); 4813 } while (exception.retry); 4814 return err; 4815 } 4816 4817 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4818 { 4819 struct nfs4_exception exception = { 4820 .interruptible = true, 4821 }; 4822 int err; 4823 4824 do { 4825 err = _nfs4_proc_remove(dir, name, NF4DIR); 4826 trace_nfs4_remove(dir, name, err); 4827 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4828 &exception); 4829 } while (exception.retry); 4830 return err; 4831 } 4832 4833 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4834 struct dentry *dentry, 4835 struct inode *inode) 4836 { 4837 struct nfs_removeargs *args = msg->rpc_argp; 4838 struct nfs_removeres *res = msg->rpc_resp; 4839 4840 res->server = NFS_SB(dentry->d_sb); 4841 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4842 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4843 4844 nfs_fattr_init(res->dir_attr); 4845 4846 if (inode) { 4847 nfs4_inode_return_delegation(inode); 4848 nfs_d_prune_case_insensitive_aliases(inode); 4849 } 4850 } 4851 4852 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4853 { 4854 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4855 &data->args.seq_args, 4856 &data->res.seq_res, 4857 task); 4858 } 4859 4860 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4861 { 4862 struct nfs_unlinkdata *data = task->tk_calldata; 4863 struct nfs_removeres *res = &data->res; 4864 4865 if (!nfs4_sequence_done(task, &res->seq_res)) 4866 return 0; 4867 if (nfs4_async_handle_error(task, res->server, NULL, 4868 &data->timeout) == -EAGAIN) 4869 return 0; 4870 if (task->tk_status == 0) 4871 nfs4_update_changeattr(dir, &res->cinfo, 4872 res->dir_attr->time_start, 4873 NFS_INO_INVALID_DATA); 4874 return 1; 4875 } 4876 4877 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4878 struct dentry *old_dentry, 4879 struct dentry *new_dentry) 4880 { 4881 struct nfs_renameargs *arg = msg->rpc_argp; 4882 struct nfs_renameres *res = msg->rpc_resp; 4883 struct inode *old_inode = d_inode(old_dentry); 4884 struct inode *new_inode = d_inode(new_dentry); 4885 4886 if (old_inode) 4887 nfs4_inode_make_writeable(old_inode); 4888 if (new_inode) 4889 nfs4_inode_return_delegation(new_inode); 4890 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4891 res->server = NFS_SB(old_dentry->d_sb); 4892 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4893 } 4894 4895 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4896 { 4897 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4898 &data->args.seq_args, 4899 &data->res.seq_res, 4900 task); 4901 } 4902 4903 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4904 struct inode *new_dir) 4905 { 4906 struct nfs_renamedata *data = task->tk_calldata; 4907 struct nfs_renameres *res = &data->res; 4908 4909 if (!nfs4_sequence_done(task, &res->seq_res)) 4910 return 0; 4911 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4912 return 0; 4913 4914 if (task->tk_status == 0) { 4915 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4916 if (new_dir != old_dir) { 4917 /* Note: If we moved a directory, nlink will change */ 4918 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4919 res->old_fattr->time_start, 4920 NFS_INO_INVALID_NLINK | 4921 NFS_INO_INVALID_DATA); 4922 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4923 res->new_fattr->time_start, 4924 NFS_INO_INVALID_NLINK | 4925 NFS_INO_INVALID_DATA); 4926 } else 4927 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4928 res->old_fattr->time_start, 4929 NFS_INO_INVALID_DATA); 4930 } 4931 return 1; 4932 } 4933 4934 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4935 { 4936 struct nfs_server *server = NFS_SERVER(inode); 4937 __u32 bitmask[NFS4_BITMASK_SZ]; 4938 struct nfs4_link_arg arg = { 4939 .fh = NFS_FH(inode), 4940 .dir_fh = NFS_FH(dir), 4941 .name = name, 4942 .bitmask = bitmask, 4943 }; 4944 struct nfs4_link_res res = { 4945 .server = server, 4946 }; 4947 struct rpc_message msg = { 4948 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4949 .rpc_argp = &arg, 4950 .rpc_resp = &res, 4951 }; 4952 int status = -ENOMEM; 4953 4954 res.fattr = nfs_alloc_fattr_with_label(server); 4955 if (res.fattr == NULL) 4956 goto out; 4957 4958 nfs4_inode_make_writeable(inode); 4959 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4960 NFS_INO_INVALID_CHANGE); 4961 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4962 if (!status) { 4963 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4964 NFS_INO_INVALID_DATA); 4965 nfs4_inc_nlink(inode); 4966 status = nfs_post_op_update_inode(inode, res.fattr); 4967 if (!status) 4968 nfs_setsecurity(inode, res.fattr); 4969 } 4970 4971 out: 4972 nfs_free_fattr(res.fattr); 4973 return status; 4974 } 4975 4976 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4977 { 4978 struct nfs4_exception exception = { 4979 .interruptible = true, 4980 }; 4981 int err; 4982 do { 4983 err = nfs4_handle_exception(NFS_SERVER(inode), 4984 _nfs4_proc_link(inode, dir, name), 4985 &exception); 4986 } while (exception.retry); 4987 return err; 4988 } 4989 4990 struct nfs4_createdata { 4991 struct rpc_message msg; 4992 struct nfs4_create_arg arg; 4993 struct nfs4_create_res res; 4994 struct nfs_fh fh; 4995 struct nfs_fattr fattr; 4996 }; 4997 4998 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4999 const struct qstr *name, struct iattr *sattr, u32 ftype) 5000 { 5001 struct nfs4_createdata *data; 5002 5003 data = kzalloc(sizeof(*data), GFP_KERNEL); 5004 if (data != NULL) { 5005 struct nfs_server *server = NFS_SERVER(dir); 5006 5007 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 5008 if (IS_ERR(data->fattr.label)) 5009 goto out_free; 5010 5011 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 5012 data->msg.rpc_argp = &data->arg; 5013 data->msg.rpc_resp = &data->res; 5014 data->arg.dir_fh = NFS_FH(dir); 5015 data->arg.server = server; 5016 data->arg.name = name; 5017 data->arg.attrs = sattr; 5018 data->arg.ftype = ftype; 5019 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 5020 data->arg.umask = current_umask(); 5021 data->res.server = server; 5022 data->res.fh = &data->fh; 5023 data->res.fattr = &data->fattr; 5024 nfs_fattr_init(data->res.fattr); 5025 } 5026 return data; 5027 out_free: 5028 kfree(data); 5029 return NULL; 5030 } 5031 5032 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 5033 { 5034 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 5035 &data->arg.seq_args, &data->res.seq_res, 1); 5036 if (status == 0) { 5037 spin_lock(&dir->i_lock); 5038 /* Creating a directory bumps nlink in the parent */ 5039 if (data->arg.ftype == NF4DIR) 5040 nfs4_inc_nlink_locked(dir); 5041 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 5042 data->res.fattr->time_start, 5043 NFS_INO_INVALID_DATA); 5044 spin_unlock(&dir->i_lock); 5045 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5046 } 5047 return status; 5048 } 5049 5050 static void nfs4_free_createdata(struct nfs4_createdata *data) 5051 { 5052 nfs4_label_free(data->fattr.label); 5053 kfree(data); 5054 } 5055 5056 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5057 struct folio *folio, unsigned int len, struct iattr *sattr, 5058 struct nfs4_label *label) 5059 { 5060 struct page *page = &folio->page; 5061 struct nfs4_createdata *data; 5062 int status = -ENAMETOOLONG; 5063 5064 if (len > NFS4_MAXPATHLEN) 5065 goto out; 5066 5067 status = -ENOMEM; 5068 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5069 if (data == NULL) 5070 goto out; 5071 5072 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5073 data->arg.u.symlink.pages = &page; 5074 data->arg.u.symlink.len = len; 5075 data->arg.label = label; 5076 5077 status = nfs4_do_create(dir, dentry, data); 5078 5079 nfs4_free_createdata(data); 5080 out: 5081 return status; 5082 } 5083 5084 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5085 struct folio *folio, unsigned int len, struct iattr *sattr) 5086 { 5087 struct nfs4_exception exception = { 5088 .interruptible = true, 5089 }; 5090 struct nfs4_label l, *label; 5091 int err; 5092 5093 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5094 5095 do { 5096 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label); 5097 trace_nfs4_symlink(dir, &dentry->d_name, err); 5098 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5099 &exception); 5100 } while (exception.retry); 5101 5102 nfs4_label_release_security(label); 5103 return err; 5104 } 5105 5106 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5107 struct iattr *sattr, struct nfs4_label *label) 5108 { 5109 struct nfs4_createdata *data; 5110 int status = -ENOMEM; 5111 5112 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5113 if (data == NULL) 5114 goto out; 5115 5116 data->arg.label = label; 5117 status = nfs4_do_create(dir, dentry, data); 5118 5119 nfs4_free_createdata(data); 5120 out: 5121 return status; 5122 } 5123 5124 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5125 struct iattr *sattr) 5126 { 5127 struct nfs_server *server = NFS_SERVER(dir); 5128 struct nfs4_exception exception = { 5129 .interruptible = true, 5130 }; 5131 struct nfs4_label l, *label; 5132 int err; 5133 5134 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5135 5136 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5137 sattr->ia_mode &= ~current_umask(); 5138 do { 5139 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5140 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5141 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5142 &exception); 5143 } while (exception.retry); 5144 nfs4_label_release_security(label); 5145 5146 return err; 5147 } 5148 5149 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5150 struct nfs_readdir_res *nr_res) 5151 { 5152 struct inode *dir = d_inode(nr_arg->dentry); 5153 struct nfs_server *server = NFS_SERVER(dir); 5154 struct nfs4_readdir_arg args = { 5155 .fh = NFS_FH(dir), 5156 .pages = nr_arg->pages, 5157 .pgbase = 0, 5158 .count = nr_arg->page_len, 5159 .plus = nr_arg->plus, 5160 }; 5161 struct nfs4_readdir_res res; 5162 struct rpc_message msg = { 5163 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5164 .rpc_argp = &args, 5165 .rpc_resp = &res, 5166 .rpc_cred = nr_arg->cred, 5167 }; 5168 int status; 5169 5170 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5171 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5172 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5173 args.bitmask = server->attr_bitmask_nl; 5174 else 5175 args.bitmask = server->attr_bitmask; 5176 5177 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5178 res.pgbase = args.pgbase; 5179 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5180 &res.seq_res, 0); 5181 if (status >= 0) { 5182 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5183 status += args.pgbase; 5184 } 5185 5186 nfs_invalidate_atime(dir); 5187 5188 dprintk("%s: returns %d\n", __func__, status); 5189 return status; 5190 } 5191 5192 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5193 struct nfs_readdir_res *res) 5194 { 5195 struct nfs4_exception exception = { 5196 .interruptible = true, 5197 }; 5198 int err; 5199 do { 5200 err = _nfs4_proc_readdir(arg, res); 5201 trace_nfs4_readdir(d_inode(arg->dentry), err); 5202 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5203 err, &exception); 5204 } while (exception.retry); 5205 return err; 5206 } 5207 5208 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5209 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5210 { 5211 struct nfs4_createdata *data; 5212 int mode = sattr->ia_mode; 5213 int status = -ENOMEM; 5214 5215 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5216 if (data == NULL) 5217 goto out; 5218 5219 if (S_ISFIFO(mode)) 5220 data->arg.ftype = NF4FIFO; 5221 else if (S_ISBLK(mode)) { 5222 data->arg.ftype = NF4BLK; 5223 data->arg.u.device.specdata1 = MAJOR(rdev); 5224 data->arg.u.device.specdata2 = MINOR(rdev); 5225 } 5226 else if (S_ISCHR(mode)) { 5227 data->arg.ftype = NF4CHR; 5228 data->arg.u.device.specdata1 = MAJOR(rdev); 5229 data->arg.u.device.specdata2 = MINOR(rdev); 5230 } else if (!S_ISSOCK(mode)) { 5231 status = -EINVAL; 5232 goto out_free; 5233 } 5234 5235 data->arg.label = label; 5236 status = nfs4_do_create(dir, dentry, data); 5237 out_free: 5238 nfs4_free_createdata(data); 5239 out: 5240 return status; 5241 } 5242 5243 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5244 struct iattr *sattr, dev_t rdev) 5245 { 5246 struct nfs_server *server = NFS_SERVER(dir); 5247 struct nfs4_exception exception = { 5248 .interruptible = true, 5249 }; 5250 struct nfs4_label l, *label; 5251 int err; 5252 5253 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5254 5255 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5256 sattr->ia_mode &= ~current_umask(); 5257 do { 5258 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5259 trace_nfs4_mknod(dir, &dentry->d_name, err); 5260 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5261 &exception); 5262 } while (exception.retry); 5263 5264 nfs4_label_release_security(label); 5265 5266 return err; 5267 } 5268 5269 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5270 struct nfs_fsstat *fsstat) 5271 { 5272 struct nfs4_statfs_arg args = { 5273 .fh = fhandle, 5274 .bitmask = server->attr_bitmask, 5275 }; 5276 struct nfs4_statfs_res res = { 5277 .fsstat = fsstat, 5278 }; 5279 struct rpc_message msg = { 5280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5281 .rpc_argp = &args, 5282 .rpc_resp = &res, 5283 }; 5284 5285 nfs_fattr_init(fsstat->fattr); 5286 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5287 } 5288 5289 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5290 { 5291 struct nfs4_exception exception = { 5292 .interruptible = true, 5293 }; 5294 int err; 5295 do { 5296 err = nfs4_handle_exception(server, 5297 _nfs4_proc_statfs(server, fhandle, fsstat), 5298 &exception); 5299 } while (exception.retry); 5300 return err; 5301 } 5302 5303 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5304 struct nfs_fsinfo *fsinfo) 5305 { 5306 struct nfs4_fsinfo_arg args = { 5307 .fh = fhandle, 5308 .bitmask = server->attr_bitmask, 5309 }; 5310 struct nfs4_fsinfo_res res = { 5311 .fsinfo = fsinfo, 5312 }; 5313 struct rpc_message msg = { 5314 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5315 .rpc_argp = &args, 5316 .rpc_resp = &res, 5317 }; 5318 5319 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5320 } 5321 5322 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5323 { 5324 struct nfs4_exception exception = { 5325 .interruptible = true, 5326 }; 5327 int err; 5328 5329 do { 5330 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5331 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5332 if (err == 0) { 5333 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5334 break; 5335 } 5336 err = nfs4_handle_exception(server, err, &exception); 5337 } while (exception.retry); 5338 return err; 5339 } 5340 5341 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5342 { 5343 int error; 5344 5345 nfs_fattr_init(fsinfo->fattr); 5346 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5347 if (error == 0) { 5348 /* block layout checks this! */ 5349 server->pnfs_blksize = fsinfo->blksize; 5350 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5351 } 5352 5353 return error; 5354 } 5355 5356 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5357 struct nfs_pathconf *pathconf) 5358 { 5359 struct nfs4_pathconf_arg args = { 5360 .fh = fhandle, 5361 .bitmask = server->attr_bitmask, 5362 }; 5363 struct nfs4_pathconf_res res = { 5364 .pathconf = pathconf, 5365 }; 5366 struct rpc_message msg = { 5367 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5368 .rpc_argp = &args, 5369 .rpc_resp = &res, 5370 }; 5371 5372 /* None of the pathconf attributes are mandatory to implement */ 5373 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5374 memset(pathconf, 0, sizeof(*pathconf)); 5375 return 0; 5376 } 5377 5378 nfs_fattr_init(pathconf->fattr); 5379 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5380 } 5381 5382 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5383 struct nfs_pathconf *pathconf) 5384 { 5385 struct nfs4_exception exception = { 5386 .interruptible = true, 5387 }; 5388 int err; 5389 5390 do { 5391 err = nfs4_handle_exception(server, 5392 _nfs4_proc_pathconf(server, fhandle, pathconf), 5393 &exception); 5394 } while (exception.retry); 5395 return err; 5396 } 5397 5398 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5399 const struct nfs_open_context *ctx, 5400 const struct nfs_lock_context *l_ctx, 5401 fmode_t fmode) 5402 { 5403 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5404 } 5405 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5406 5407 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5408 const struct nfs_open_context *ctx, 5409 const struct nfs_lock_context *l_ctx, 5410 fmode_t fmode) 5411 { 5412 nfs4_stateid _current_stateid; 5413 5414 /* If the current stateid represents a lost lock, then exit */ 5415 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5416 return true; 5417 return nfs4_stateid_match(stateid, &_current_stateid); 5418 } 5419 5420 static bool nfs4_error_stateid_expired(int err) 5421 { 5422 switch (err) { 5423 case -NFS4ERR_DELEG_REVOKED: 5424 case -NFS4ERR_ADMIN_REVOKED: 5425 case -NFS4ERR_BAD_STATEID: 5426 case -NFS4ERR_STALE_STATEID: 5427 case -NFS4ERR_OLD_STATEID: 5428 case -NFS4ERR_OPENMODE: 5429 case -NFS4ERR_EXPIRED: 5430 return true; 5431 } 5432 return false; 5433 } 5434 5435 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5436 { 5437 struct nfs_server *server = NFS_SERVER(hdr->inode); 5438 5439 trace_nfs4_read(hdr, task->tk_status); 5440 if (task->tk_status < 0) { 5441 struct nfs4_exception exception = { 5442 .inode = hdr->inode, 5443 .state = hdr->args.context->state, 5444 .stateid = &hdr->args.stateid, 5445 }; 5446 task->tk_status = nfs4_async_handle_exception(task, 5447 server, task->tk_status, &exception); 5448 if (exception.retry) { 5449 rpc_restart_call_prepare(task); 5450 return -EAGAIN; 5451 } 5452 } 5453 5454 if (task->tk_status > 0) 5455 renew_lease(server, hdr->timestamp); 5456 return 0; 5457 } 5458 5459 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5460 struct nfs_pgio_args *args) 5461 { 5462 5463 if (!nfs4_error_stateid_expired(task->tk_status) || 5464 nfs4_stateid_is_current(&args->stateid, 5465 args->context, 5466 args->lock_context, 5467 FMODE_READ)) 5468 return false; 5469 rpc_restart_call_prepare(task); 5470 return true; 5471 } 5472 5473 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5474 struct nfs_pgio_header *hdr) 5475 { 5476 struct nfs_server *server = NFS_SERVER(hdr->inode); 5477 struct rpc_message *msg = &task->tk_msg; 5478 5479 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5480 task->tk_status == -ENOTSUPP) { 5481 server->caps &= ~NFS_CAP_READ_PLUS; 5482 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5483 rpc_restart_call_prepare(task); 5484 return true; 5485 } 5486 return false; 5487 } 5488 5489 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5490 { 5491 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5492 return -EAGAIN; 5493 if (nfs4_read_stateid_changed(task, &hdr->args)) 5494 return -EAGAIN; 5495 if (nfs4_read_plus_not_supported(task, hdr)) 5496 return -EAGAIN; 5497 if (task->tk_status > 0) 5498 nfs_invalidate_atime(hdr->inode); 5499 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5500 nfs4_read_done_cb(task, hdr); 5501 } 5502 5503 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5504 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5505 struct rpc_message *msg) 5506 { 5507 /* Note: We don't use READ_PLUS with pNFS yet */ 5508 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5509 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5510 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5511 } 5512 return false; 5513 } 5514 #else 5515 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5516 struct rpc_message *msg) 5517 { 5518 return false; 5519 } 5520 #endif /* CONFIG_NFS_V4_2 */ 5521 5522 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5523 struct rpc_message *msg) 5524 { 5525 hdr->timestamp = jiffies; 5526 if (!hdr->pgio_done_cb) 5527 hdr->pgio_done_cb = nfs4_read_done_cb; 5528 if (!nfs42_read_plus_support(hdr, msg)) 5529 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5530 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5531 } 5532 5533 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5534 struct nfs_pgio_header *hdr) 5535 { 5536 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5537 &hdr->args.seq_args, 5538 &hdr->res.seq_res, 5539 task)) 5540 return 0; 5541 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5542 hdr->args.lock_context, 5543 hdr->rw_mode) == -EIO) 5544 return -EIO; 5545 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5546 return -EIO; 5547 return 0; 5548 } 5549 5550 static int nfs4_write_done_cb(struct rpc_task *task, 5551 struct nfs_pgio_header *hdr) 5552 { 5553 struct inode *inode = hdr->inode; 5554 5555 trace_nfs4_write(hdr, task->tk_status); 5556 if (task->tk_status < 0) { 5557 struct nfs4_exception exception = { 5558 .inode = hdr->inode, 5559 .state = hdr->args.context->state, 5560 .stateid = &hdr->args.stateid, 5561 }; 5562 task->tk_status = nfs4_async_handle_exception(task, 5563 NFS_SERVER(inode), task->tk_status, 5564 &exception); 5565 if (exception.retry) { 5566 rpc_restart_call_prepare(task); 5567 return -EAGAIN; 5568 } 5569 } 5570 if (task->tk_status >= 0) { 5571 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5572 nfs_writeback_update_inode(hdr); 5573 } 5574 return 0; 5575 } 5576 5577 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5578 struct nfs_pgio_args *args) 5579 { 5580 5581 if (!nfs4_error_stateid_expired(task->tk_status) || 5582 nfs4_stateid_is_current(&args->stateid, 5583 args->context, 5584 args->lock_context, 5585 FMODE_WRITE)) 5586 return false; 5587 rpc_restart_call_prepare(task); 5588 return true; 5589 } 5590 5591 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5592 { 5593 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5594 return -EAGAIN; 5595 if (nfs4_write_stateid_changed(task, &hdr->args)) 5596 return -EAGAIN; 5597 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5598 nfs4_write_done_cb(task, hdr); 5599 } 5600 5601 static 5602 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5603 { 5604 /* Don't request attributes for pNFS or O_DIRECT writes */ 5605 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5606 return false; 5607 /* Otherwise, request attributes if and only if we don't hold 5608 * a delegation 5609 */ 5610 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5611 } 5612 5613 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5614 struct inode *inode, unsigned long cache_validity) 5615 { 5616 struct nfs_server *server = NFS_SERVER(inode); 5617 unsigned int i; 5618 5619 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5620 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5621 5622 if (cache_validity & NFS_INO_INVALID_CHANGE) 5623 bitmask[0] |= FATTR4_WORD0_CHANGE; 5624 if (cache_validity & NFS_INO_INVALID_ATIME) 5625 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5626 if (cache_validity & NFS_INO_INVALID_MODE) 5627 bitmask[1] |= FATTR4_WORD1_MODE; 5628 if (cache_validity & NFS_INO_INVALID_OTHER) 5629 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5630 if (cache_validity & NFS_INO_INVALID_NLINK) 5631 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5632 if (cache_validity & NFS_INO_INVALID_CTIME) 5633 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5634 if (cache_validity & NFS_INO_INVALID_MTIME) 5635 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5636 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5637 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5638 5639 if (cache_validity & NFS_INO_INVALID_SIZE) 5640 bitmask[0] |= FATTR4_WORD0_SIZE; 5641 5642 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5643 bitmask[i] &= server->attr_bitmask[i]; 5644 } 5645 5646 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5647 struct rpc_message *msg, 5648 struct rpc_clnt **clnt) 5649 { 5650 struct nfs_server *server = NFS_SERVER(hdr->inode); 5651 5652 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5653 hdr->args.bitmask = NULL; 5654 hdr->res.fattr = NULL; 5655 } else { 5656 nfs4_bitmask_set(hdr->args.bitmask_store, 5657 server->cache_consistency_bitmask, 5658 hdr->inode, NFS_INO_INVALID_BLOCKS); 5659 hdr->args.bitmask = hdr->args.bitmask_store; 5660 } 5661 5662 if (!hdr->pgio_done_cb) 5663 hdr->pgio_done_cb = nfs4_write_done_cb; 5664 hdr->res.server = server; 5665 hdr->timestamp = jiffies; 5666 5667 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5668 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5669 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr); 5670 } 5671 5672 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5673 { 5674 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5675 &data->args.seq_args, 5676 &data->res.seq_res, 5677 task); 5678 } 5679 5680 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5681 { 5682 struct inode *inode = data->inode; 5683 5684 trace_nfs4_commit(data, task->tk_status); 5685 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5686 NULL, NULL) == -EAGAIN) { 5687 rpc_restart_call_prepare(task); 5688 return -EAGAIN; 5689 } 5690 return 0; 5691 } 5692 5693 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5694 { 5695 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5696 return -EAGAIN; 5697 return data->commit_done_cb(task, data); 5698 } 5699 5700 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5701 struct rpc_clnt **clnt) 5702 { 5703 struct nfs_server *server = NFS_SERVER(data->inode); 5704 5705 if (data->commit_done_cb == NULL) 5706 data->commit_done_cb = nfs4_commit_done_cb; 5707 data->res.server = server; 5708 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5709 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5710 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client, 5711 NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5712 } 5713 5714 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5715 struct nfs_commitres *res) 5716 { 5717 struct inode *dst_inode = file_inode(dst); 5718 struct nfs_server *server = NFS_SERVER(dst_inode); 5719 struct rpc_message msg = { 5720 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5721 .rpc_argp = args, 5722 .rpc_resp = res, 5723 }; 5724 5725 args->fh = NFS_FH(dst_inode); 5726 return nfs4_call_sync(server->client, server, &msg, 5727 &args->seq_args, &res->seq_res, 1); 5728 } 5729 5730 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5731 { 5732 struct nfs_commitargs args = { 5733 .offset = offset, 5734 .count = count, 5735 }; 5736 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5737 struct nfs4_exception exception = { }; 5738 int status; 5739 5740 do { 5741 status = _nfs4_proc_commit(dst, &args, res); 5742 status = nfs4_handle_exception(dst_server, status, &exception); 5743 } while (exception.retry); 5744 5745 return status; 5746 } 5747 5748 struct nfs4_renewdata { 5749 struct nfs_client *client; 5750 unsigned long timestamp; 5751 }; 5752 5753 /* 5754 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5755 * standalone procedure for queueing an asynchronous RENEW. 5756 */ 5757 static void nfs4_renew_release(void *calldata) 5758 { 5759 struct nfs4_renewdata *data = calldata; 5760 struct nfs_client *clp = data->client; 5761 5762 if (refcount_read(&clp->cl_count) > 1) 5763 nfs4_schedule_state_renewal(clp); 5764 nfs_put_client(clp); 5765 kfree(data); 5766 } 5767 5768 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5769 { 5770 struct nfs4_renewdata *data = calldata; 5771 struct nfs_client *clp = data->client; 5772 unsigned long timestamp = data->timestamp; 5773 5774 trace_nfs4_renew_async(clp, task->tk_status); 5775 switch (task->tk_status) { 5776 case 0: 5777 break; 5778 case -NFS4ERR_LEASE_MOVED: 5779 nfs4_schedule_lease_moved_recovery(clp); 5780 break; 5781 default: 5782 /* Unless we're shutting down, schedule state recovery! */ 5783 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5784 return; 5785 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5786 nfs4_schedule_lease_recovery(clp); 5787 return; 5788 } 5789 nfs4_schedule_path_down_recovery(clp); 5790 } 5791 do_renew_lease(clp, timestamp); 5792 } 5793 5794 static const struct rpc_call_ops nfs4_renew_ops = { 5795 .rpc_call_done = nfs4_renew_done, 5796 .rpc_release = nfs4_renew_release, 5797 }; 5798 5799 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5800 { 5801 struct rpc_message msg = { 5802 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5803 .rpc_argp = clp, 5804 .rpc_cred = cred, 5805 }; 5806 struct nfs4_renewdata *data; 5807 5808 if (renew_flags == 0) 5809 return 0; 5810 if (!refcount_inc_not_zero(&clp->cl_count)) 5811 return -EIO; 5812 data = kmalloc(sizeof(*data), GFP_NOFS); 5813 if (data == NULL) { 5814 nfs_put_client(clp); 5815 return -ENOMEM; 5816 } 5817 data->client = clp; 5818 data->timestamp = jiffies; 5819 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5820 &nfs4_renew_ops, data); 5821 } 5822 5823 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5824 { 5825 struct rpc_message msg = { 5826 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5827 .rpc_argp = clp, 5828 .rpc_cred = cred, 5829 }; 5830 unsigned long now = jiffies; 5831 int status; 5832 5833 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5834 if (status < 0) 5835 return status; 5836 do_renew_lease(clp, now); 5837 return 0; 5838 } 5839 5840 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5841 enum nfs4_acl_type type) 5842 { 5843 switch (type) { 5844 default: 5845 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5846 case NFS4ACL_DACL: 5847 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5848 case NFS4ACL_SACL: 5849 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5850 } 5851 } 5852 5853 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5854 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5855 * the stack. 5856 */ 5857 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5858 5859 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5860 struct page **pages) 5861 { 5862 struct page *newpage, **spages; 5863 int rc = 0; 5864 size_t len; 5865 spages = pages; 5866 5867 do { 5868 len = min_t(size_t, PAGE_SIZE, buflen); 5869 newpage = alloc_page(GFP_KERNEL); 5870 5871 if (newpage == NULL) 5872 goto unwind; 5873 memcpy(page_address(newpage), buf, len); 5874 buf += len; 5875 buflen -= len; 5876 *pages++ = newpage; 5877 rc++; 5878 } while (buflen != 0); 5879 5880 return rc; 5881 5882 unwind: 5883 for(; rc > 0; rc--) 5884 __free_page(spages[rc-1]); 5885 return -ENOMEM; 5886 } 5887 5888 struct nfs4_cached_acl { 5889 enum nfs4_acl_type type; 5890 int cached; 5891 size_t len; 5892 char data[]; 5893 }; 5894 5895 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5896 { 5897 struct nfs_inode *nfsi = NFS_I(inode); 5898 5899 spin_lock(&inode->i_lock); 5900 kfree(nfsi->nfs4_acl); 5901 nfsi->nfs4_acl = acl; 5902 spin_unlock(&inode->i_lock); 5903 } 5904 5905 static void nfs4_zap_acl_attr(struct inode *inode) 5906 { 5907 nfs4_set_cached_acl(inode, NULL); 5908 } 5909 5910 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5911 size_t buflen, enum nfs4_acl_type type) 5912 { 5913 struct nfs_inode *nfsi = NFS_I(inode); 5914 struct nfs4_cached_acl *acl; 5915 int ret = -ENOENT; 5916 5917 spin_lock(&inode->i_lock); 5918 acl = nfsi->nfs4_acl; 5919 if (acl == NULL) 5920 goto out; 5921 if (acl->type != type) 5922 goto out; 5923 if (buf == NULL) /* user is just asking for length */ 5924 goto out_len; 5925 if (acl->cached == 0) 5926 goto out; 5927 ret = -ERANGE; /* see getxattr(2) man page */ 5928 if (acl->len > buflen) 5929 goto out; 5930 memcpy(buf, acl->data, acl->len); 5931 out_len: 5932 ret = acl->len; 5933 out: 5934 spin_unlock(&inode->i_lock); 5935 return ret; 5936 } 5937 5938 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5939 size_t pgbase, size_t acl_len, 5940 enum nfs4_acl_type type) 5941 { 5942 struct nfs4_cached_acl *acl; 5943 size_t buflen = sizeof(*acl) + acl_len; 5944 5945 if (buflen <= PAGE_SIZE) { 5946 acl = kmalloc(buflen, GFP_KERNEL); 5947 if (acl == NULL) 5948 goto out; 5949 acl->cached = 1; 5950 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5951 } else { 5952 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5953 if (acl == NULL) 5954 goto out; 5955 acl->cached = 0; 5956 } 5957 acl->type = type; 5958 acl->len = acl_len; 5959 out: 5960 nfs4_set_cached_acl(inode, acl); 5961 } 5962 5963 /* 5964 * The getxattr API returns the required buffer length when called with a 5965 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5966 * the required buf. On a NULL buf, we send a page of data to the server 5967 * guessing that the ACL request can be serviced by a page. If so, we cache 5968 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5969 * the cache. If not so, we throw away the page, and cache the required 5970 * length. The next getxattr call will then produce another round trip to 5971 * the server, this time with the input buf of the required size. 5972 */ 5973 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5974 size_t buflen, enum nfs4_acl_type type) 5975 { 5976 struct page **pages; 5977 struct nfs_getaclargs args = { 5978 .fh = NFS_FH(inode), 5979 .acl_type = type, 5980 .acl_len = buflen, 5981 }; 5982 struct nfs_getaclres res = { 5983 .acl_type = type, 5984 .acl_len = buflen, 5985 }; 5986 struct rpc_message msg = { 5987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5988 .rpc_argp = &args, 5989 .rpc_resp = &res, 5990 }; 5991 unsigned int npages; 5992 int ret = -ENOMEM, i; 5993 struct nfs_server *server = NFS_SERVER(inode); 5994 5995 if (buflen == 0) 5996 buflen = server->rsize; 5997 5998 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5999 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 6000 if (!pages) 6001 return -ENOMEM; 6002 6003 args.acl_pages = pages; 6004 6005 for (i = 0; i < npages; i++) { 6006 pages[i] = alloc_page(GFP_KERNEL); 6007 if (!pages[i]) 6008 goto out_free; 6009 } 6010 6011 /* for decoding across pages */ 6012 res.acl_scratch = alloc_page(GFP_KERNEL); 6013 if (!res.acl_scratch) 6014 goto out_free; 6015 6016 args.acl_len = npages * PAGE_SIZE; 6017 6018 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 6019 __func__, buf, buflen, npages, args.acl_len); 6020 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 6021 &msg, &args.seq_args, &res.seq_res, 0); 6022 if (ret) 6023 goto out_free; 6024 6025 /* Handle the case where the passed-in buffer is too short */ 6026 if (res.acl_flags & NFS4_ACL_TRUNC) { 6027 /* Did the user only issue a request for the acl length? */ 6028 if (buf == NULL) 6029 goto out_ok; 6030 ret = -ERANGE; 6031 goto out_free; 6032 } 6033 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 6034 type); 6035 if (buf) { 6036 if (res.acl_len > buflen) { 6037 ret = -ERANGE; 6038 goto out_free; 6039 } 6040 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 6041 } 6042 out_ok: 6043 ret = res.acl_len; 6044 out_free: 6045 while (--i >= 0) 6046 __free_page(pages[i]); 6047 if (res.acl_scratch) 6048 __free_page(res.acl_scratch); 6049 kfree(pages); 6050 return ret; 6051 } 6052 6053 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6054 size_t buflen, enum nfs4_acl_type type) 6055 { 6056 struct nfs4_exception exception = { 6057 .interruptible = true, 6058 }; 6059 ssize_t ret; 6060 do { 6061 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6062 trace_nfs4_get_acl(inode, ret); 6063 if (ret >= 0) 6064 break; 6065 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6066 } while (exception.retry); 6067 return ret; 6068 } 6069 6070 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6071 enum nfs4_acl_type type) 6072 { 6073 struct nfs_server *server = NFS_SERVER(inode); 6074 int ret; 6075 6076 if (!nfs4_server_supports_acls(server, type)) 6077 return -EOPNOTSUPP; 6078 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6079 if (ret < 0) 6080 return ret; 6081 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6082 nfs_zap_acl_cache(inode); 6083 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6084 if (ret != -ENOENT) 6085 /* -ENOENT is returned if there is no ACL or if there is an ACL 6086 * but no cached acl data, just the acl length */ 6087 return ret; 6088 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6089 } 6090 6091 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6092 size_t buflen, enum nfs4_acl_type type) 6093 { 6094 struct nfs_server *server = NFS_SERVER(inode); 6095 struct page *pages[NFS4ACL_MAXPAGES]; 6096 struct nfs_setaclargs arg = { 6097 .fh = NFS_FH(inode), 6098 .acl_type = type, 6099 .acl_len = buflen, 6100 .acl_pages = pages, 6101 }; 6102 struct nfs_setaclres res; 6103 struct rpc_message msg = { 6104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6105 .rpc_argp = &arg, 6106 .rpc_resp = &res, 6107 }; 6108 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6109 int ret, i; 6110 6111 /* You can't remove system.nfs4_acl: */ 6112 if (buflen == 0) 6113 return -EINVAL; 6114 if (!nfs4_server_supports_acls(server, type)) 6115 return -EOPNOTSUPP; 6116 if (npages > ARRAY_SIZE(pages)) 6117 return -ERANGE; 6118 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6119 if (i < 0) 6120 return i; 6121 nfs4_inode_make_writeable(inode); 6122 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6123 6124 /* 6125 * Free each page after tx, so the only ref left is 6126 * held by the network stack 6127 */ 6128 for (; i > 0; i--) 6129 put_page(pages[i-1]); 6130 6131 /* 6132 * Acl update can result in inode attribute update. 6133 * so mark the attribute cache invalid. 6134 */ 6135 spin_lock(&inode->i_lock); 6136 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6137 NFS_INO_INVALID_CTIME | 6138 NFS_INO_REVAL_FORCED); 6139 spin_unlock(&inode->i_lock); 6140 nfs_access_zap_cache(inode); 6141 nfs_zap_acl_cache(inode); 6142 return ret; 6143 } 6144 6145 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6146 size_t buflen, enum nfs4_acl_type type) 6147 { 6148 struct nfs4_exception exception = { }; 6149 int err; 6150 do { 6151 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6152 trace_nfs4_set_acl(inode, err); 6153 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6154 /* 6155 * no need to retry since the kernel 6156 * isn't involved in encoding the ACEs. 6157 */ 6158 err = -EINVAL; 6159 break; 6160 } 6161 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6162 &exception); 6163 } while (exception.retry); 6164 return err; 6165 } 6166 6167 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6168 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6169 size_t buflen) 6170 { 6171 struct nfs_server *server = NFS_SERVER(inode); 6172 struct nfs4_label label = {0, 0, buflen, buf}; 6173 6174 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6175 struct nfs_fattr fattr = { 6176 .label = &label, 6177 }; 6178 struct nfs4_getattr_arg arg = { 6179 .fh = NFS_FH(inode), 6180 .bitmask = bitmask, 6181 }; 6182 struct nfs4_getattr_res res = { 6183 .fattr = &fattr, 6184 .server = server, 6185 }; 6186 struct rpc_message msg = { 6187 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6188 .rpc_argp = &arg, 6189 .rpc_resp = &res, 6190 }; 6191 int ret; 6192 6193 nfs_fattr_init(&fattr); 6194 6195 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6196 if (ret) 6197 return ret; 6198 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6199 return -ENOENT; 6200 return label.len; 6201 } 6202 6203 static int nfs4_get_security_label(struct inode *inode, void *buf, 6204 size_t buflen) 6205 { 6206 struct nfs4_exception exception = { 6207 .interruptible = true, 6208 }; 6209 int err; 6210 6211 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6212 return -EOPNOTSUPP; 6213 6214 do { 6215 err = _nfs4_get_security_label(inode, buf, buflen); 6216 trace_nfs4_get_security_label(inode, err); 6217 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6218 &exception); 6219 } while (exception.retry); 6220 return err; 6221 } 6222 6223 static int _nfs4_do_set_security_label(struct inode *inode, 6224 struct nfs4_label *ilabel, 6225 struct nfs_fattr *fattr) 6226 { 6227 6228 struct iattr sattr = {0}; 6229 struct nfs_server *server = NFS_SERVER(inode); 6230 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6231 struct nfs_setattrargs arg = { 6232 .fh = NFS_FH(inode), 6233 .iap = &sattr, 6234 .server = server, 6235 .bitmask = bitmask, 6236 .label = ilabel, 6237 }; 6238 struct nfs_setattrres res = { 6239 .fattr = fattr, 6240 .server = server, 6241 }; 6242 struct rpc_message msg = { 6243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6244 .rpc_argp = &arg, 6245 .rpc_resp = &res, 6246 }; 6247 int status; 6248 6249 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6250 6251 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6252 if (status) 6253 dprintk("%s failed: %d\n", __func__, status); 6254 6255 return status; 6256 } 6257 6258 static int nfs4_do_set_security_label(struct inode *inode, 6259 struct nfs4_label *ilabel, 6260 struct nfs_fattr *fattr) 6261 { 6262 struct nfs4_exception exception = { }; 6263 int err; 6264 6265 do { 6266 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6267 trace_nfs4_set_security_label(inode, err); 6268 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6269 &exception); 6270 } while (exception.retry); 6271 return err; 6272 } 6273 6274 static int 6275 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6276 { 6277 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6278 struct nfs_fattr *fattr; 6279 int status; 6280 6281 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6282 return -EOPNOTSUPP; 6283 6284 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6285 if (fattr == NULL) 6286 return -ENOMEM; 6287 6288 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6289 if (status == 0) 6290 nfs_setsecurity(inode, fattr); 6291 6292 nfs_free_fattr(fattr); 6293 return status; 6294 } 6295 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6296 6297 6298 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6299 nfs4_verifier *bootverf) 6300 { 6301 __be32 verf[2]; 6302 6303 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6304 /* An impossible timestamp guarantees this value 6305 * will never match a generated boot time. */ 6306 verf[0] = cpu_to_be32(U32_MAX); 6307 verf[1] = cpu_to_be32(U32_MAX); 6308 } else { 6309 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6310 u64 ns = ktime_to_ns(nn->boot_time); 6311 6312 verf[0] = cpu_to_be32(ns >> 32); 6313 verf[1] = cpu_to_be32(ns); 6314 } 6315 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6316 } 6317 6318 static size_t 6319 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6320 { 6321 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6322 struct nfs_netns_client *nn_clp = nn->nfs_client; 6323 const char *id; 6324 6325 buf[0] = '\0'; 6326 6327 if (nn_clp) { 6328 rcu_read_lock(); 6329 id = rcu_dereference(nn_clp->identifier); 6330 if (id) 6331 strscpy(buf, id, buflen); 6332 rcu_read_unlock(); 6333 } 6334 6335 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6336 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6337 6338 return strlen(buf); 6339 } 6340 6341 static int 6342 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6343 { 6344 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6345 size_t buflen; 6346 size_t len; 6347 char *str; 6348 6349 if (clp->cl_owner_id != NULL) 6350 return 0; 6351 6352 rcu_read_lock(); 6353 len = 14 + 6354 strlen(clp->cl_rpcclient->cl_nodename) + 6355 1 + 6356 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6357 1; 6358 rcu_read_unlock(); 6359 6360 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6361 if (buflen) 6362 len += buflen + 1; 6363 6364 if (len > NFS4_OPAQUE_LIMIT + 1) 6365 return -EINVAL; 6366 6367 /* 6368 * Since this string is allocated at mount time, and held until the 6369 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6370 * about a memory-reclaim deadlock. 6371 */ 6372 str = kmalloc(len, GFP_KERNEL); 6373 if (!str) 6374 return -ENOMEM; 6375 6376 rcu_read_lock(); 6377 if (buflen) 6378 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6379 clp->cl_rpcclient->cl_nodename, buf, 6380 rpc_peeraddr2str(clp->cl_rpcclient, 6381 RPC_DISPLAY_ADDR)); 6382 else 6383 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6384 clp->cl_rpcclient->cl_nodename, 6385 rpc_peeraddr2str(clp->cl_rpcclient, 6386 RPC_DISPLAY_ADDR)); 6387 rcu_read_unlock(); 6388 6389 clp->cl_owner_id = str; 6390 return 0; 6391 } 6392 6393 static int 6394 nfs4_init_uniform_client_string(struct nfs_client *clp) 6395 { 6396 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6397 size_t buflen; 6398 size_t len; 6399 char *str; 6400 6401 if (clp->cl_owner_id != NULL) 6402 return 0; 6403 6404 len = 10 + 10 + 1 + 10 + 1 + 6405 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6406 6407 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6408 if (buflen) 6409 len += buflen + 1; 6410 6411 if (len > NFS4_OPAQUE_LIMIT + 1) 6412 return -EINVAL; 6413 6414 /* 6415 * Since this string is allocated at mount time, and held until the 6416 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6417 * about a memory-reclaim deadlock. 6418 */ 6419 str = kmalloc(len, GFP_KERNEL); 6420 if (!str) 6421 return -ENOMEM; 6422 6423 if (buflen) 6424 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6425 clp->rpc_ops->version, clp->cl_minorversion, 6426 buf, clp->cl_rpcclient->cl_nodename); 6427 else 6428 scnprintf(str, len, "Linux NFSv%u.%u %s", 6429 clp->rpc_ops->version, clp->cl_minorversion, 6430 clp->cl_rpcclient->cl_nodename); 6431 clp->cl_owner_id = str; 6432 return 0; 6433 } 6434 6435 /* 6436 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6437 * services. Advertise one based on the address family of the 6438 * clientaddr. 6439 */ 6440 static unsigned int 6441 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6442 { 6443 if (strchr(clp->cl_ipaddr, ':') != NULL) 6444 return scnprintf(buf, len, "tcp6"); 6445 else 6446 return scnprintf(buf, len, "tcp"); 6447 } 6448 6449 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6450 { 6451 struct nfs4_setclientid *sc = calldata; 6452 6453 if (task->tk_status == 0) 6454 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6455 } 6456 6457 static const struct rpc_call_ops nfs4_setclientid_ops = { 6458 .rpc_call_done = nfs4_setclientid_done, 6459 }; 6460 6461 /** 6462 * nfs4_proc_setclientid - Negotiate client ID 6463 * @clp: state data structure 6464 * @program: RPC program for NFSv4 callback service 6465 * @port: IP port number for NFS4 callback service 6466 * @cred: credential to use for this call 6467 * @res: where to place the result 6468 * 6469 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6470 */ 6471 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6472 unsigned short port, const struct cred *cred, 6473 struct nfs4_setclientid_res *res) 6474 { 6475 nfs4_verifier sc_verifier; 6476 struct nfs4_setclientid setclientid = { 6477 .sc_verifier = &sc_verifier, 6478 .sc_prog = program, 6479 .sc_clnt = clp, 6480 }; 6481 struct rpc_message msg = { 6482 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6483 .rpc_argp = &setclientid, 6484 .rpc_resp = res, 6485 .rpc_cred = cred, 6486 }; 6487 struct rpc_task_setup task_setup_data = { 6488 .rpc_client = clp->cl_rpcclient, 6489 .rpc_message = &msg, 6490 .callback_ops = &nfs4_setclientid_ops, 6491 .callback_data = &setclientid, 6492 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6493 }; 6494 unsigned long now = jiffies; 6495 int status; 6496 6497 /* nfs_client_id4 */ 6498 nfs4_init_boot_verifier(clp, &sc_verifier); 6499 6500 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6501 status = nfs4_init_uniform_client_string(clp); 6502 else 6503 status = nfs4_init_nonuniform_client_string(clp); 6504 6505 if (status) 6506 goto out; 6507 6508 /* cb_client4 */ 6509 setclientid.sc_netid_len = 6510 nfs4_init_callback_netid(clp, 6511 setclientid.sc_netid, 6512 sizeof(setclientid.sc_netid)); 6513 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6514 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6515 clp->cl_ipaddr, port >> 8, port & 255); 6516 6517 dprintk("NFS call setclientid auth=%s, '%s'\n", 6518 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6519 clp->cl_owner_id); 6520 6521 status = nfs4_call_sync_custom(&task_setup_data); 6522 if (setclientid.sc_cred) { 6523 kfree(clp->cl_acceptor); 6524 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6525 put_rpccred(setclientid.sc_cred); 6526 } 6527 6528 if (status == 0) 6529 do_renew_lease(clp, now); 6530 out: 6531 trace_nfs4_setclientid(clp, status); 6532 dprintk("NFS reply setclientid: %d\n", status); 6533 return status; 6534 } 6535 6536 /** 6537 * nfs4_proc_setclientid_confirm - Confirm client ID 6538 * @clp: state data structure 6539 * @arg: result of a previous SETCLIENTID 6540 * @cred: credential to use for this call 6541 * 6542 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6543 */ 6544 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6545 struct nfs4_setclientid_res *arg, 6546 const struct cred *cred) 6547 { 6548 struct rpc_message msg = { 6549 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6550 .rpc_argp = arg, 6551 .rpc_cred = cred, 6552 }; 6553 int status; 6554 6555 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6556 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6557 clp->cl_clientid); 6558 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6559 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6560 trace_nfs4_setclientid_confirm(clp, status); 6561 dprintk("NFS reply setclientid_confirm: %d\n", status); 6562 return status; 6563 } 6564 6565 struct nfs4_delegreturndata { 6566 struct nfs4_delegreturnargs args; 6567 struct nfs4_delegreturnres res; 6568 struct nfs_fh fh; 6569 nfs4_stateid stateid; 6570 unsigned long timestamp; 6571 struct { 6572 struct nfs4_layoutreturn_args arg; 6573 struct nfs4_layoutreturn_res res; 6574 struct nfs4_xdr_opaque_data ld_private; 6575 u32 roc_barrier; 6576 bool roc; 6577 } lr; 6578 struct nfs_fattr fattr; 6579 int rpc_status; 6580 struct inode *inode; 6581 }; 6582 6583 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6584 { 6585 struct nfs4_delegreturndata *data = calldata; 6586 struct nfs4_exception exception = { 6587 .inode = data->inode, 6588 .stateid = &data->stateid, 6589 .task_is_privileged = data->args.seq_args.sa_privileged, 6590 }; 6591 6592 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6593 return; 6594 6595 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6596 6597 /* Handle Layoutreturn errors */ 6598 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6599 &data->res.lr_ret) == -EAGAIN) 6600 goto out_restart; 6601 6602 switch (task->tk_status) { 6603 case 0: 6604 renew_lease(data->res.server, data->timestamp); 6605 break; 6606 case -NFS4ERR_ADMIN_REVOKED: 6607 case -NFS4ERR_DELEG_REVOKED: 6608 case -NFS4ERR_EXPIRED: 6609 nfs4_free_revoked_stateid(data->res.server, 6610 data->args.stateid, 6611 task->tk_msg.rpc_cred); 6612 fallthrough; 6613 case -NFS4ERR_BAD_STATEID: 6614 case -NFS4ERR_STALE_STATEID: 6615 case -ETIMEDOUT: 6616 task->tk_status = 0; 6617 break; 6618 case -NFS4ERR_OLD_STATEID: 6619 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6620 nfs4_stateid_seqid_inc(&data->stateid); 6621 if (data->args.bitmask) { 6622 data->args.bitmask = NULL; 6623 data->res.fattr = NULL; 6624 } 6625 goto out_restart; 6626 case -NFS4ERR_ACCESS: 6627 if (data->args.bitmask) { 6628 data->args.bitmask = NULL; 6629 data->res.fattr = NULL; 6630 goto out_restart; 6631 } 6632 fallthrough; 6633 default: 6634 task->tk_status = nfs4_async_handle_exception(task, 6635 data->res.server, task->tk_status, 6636 &exception); 6637 if (exception.retry) 6638 goto out_restart; 6639 } 6640 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6641 data->rpc_status = task->tk_status; 6642 return; 6643 out_restart: 6644 task->tk_status = 0; 6645 rpc_restart_call_prepare(task); 6646 } 6647 6648 static void nfs4_delegreturn_release(void *calldata) 6649 { 6650 struct nfs4_delegreturndata *data = calldata; 6651 struct inode *inode = data->inode; 6652 6653 if (data->lr.roc) 6654 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6655 data->res.lr_ret); 6656 if (inode) { 6657 nfs4_fattr_set_prechange(&data->fattr, 6658 inode_peek_iversion_raw(inode)); 6659 nfs_refresh_inode(inode, &data->fattr); 6660 nfs_iput_and_deactive(inode); 6661 } 6662 kfree(calldata); 6663 } 6664 6665 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6666 { 6667 struct nfs4_delegreturndata *d_data; 6668 struct pnfs_layout_hdr *lo; 6669 6670 d_data = data; 6671 6672 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6673 nfs4_sequence_done(task, &d_data->res.seq_res); 6674 return; 6675 } 6676 6677 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6678 if (lo && !pnfs_layout_is_valid(lo)) { 6679 d_data->args.lr_args = NULL; 6680 d_data->res.lr_res = NULL; 6681 } 6682 6683 nfs4_setup_sequence(d_data->res.server->nfs_client, 6684 &d_data->args.seq_args, 6685 &d_data->res.seq_res, 6686 task); 6687 } 6688 6689 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6690 .rpc_call_prepare = nfs4_delegreturn_prepare, 6691 .rpc_call_done = nfs4_delegreturn_done, 6692 .rpc_release = nfs4_delegreturn_release, 6693 }; 6694 6695 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6696 { 6697 struct nfs4_delegreturndata *data; 6698 struct nfs_server *server = NFS_SERVER(inode); 6699 struct rpc_task *task; 6700 struct rpc_message msg = { 6701 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6702 .rpc_cred = cred, 6703 }; 6704 struct rpc_task_setup task_setup_data = { 6705 .rpc_client = server->client, 6706 .rpc_message = &msg, 6707 .callback_ops = &nfs4_delegreturn_ops, 6708 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6709 }; 6710 int status = 0; 6711 6712 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6713 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6714 6715 data = kzalloc(sizeof(*data), GFP_KERNEL); 6716 if (data == NULL) 6717 return -ENOMEM; 6718 6719 nfs4_state_protect(server->nfs_client, 6720 NFS_SP4_MACH_CRED_CLEANUP, 6721 &task_setup_data.rpc_client, &msg); 6722 6723 data->args.fhandle = &data->fh; 6724 data->args.stateid = &data->stateid; 6725 nfs4_bitmask_set(data->args.bitmask_store, 6726 server->cache_consistency_bitmask, inode, 0); 6727 data->args.bitmask = data->args.bitmask_store; 6728 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6729 nfs4_stateid_copy(&data->stateid, stateid); 6730 data->res.fattr = &data->fattr; 6731 data->res.server = server; 6732 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6733 data->lr.arg.ld_private = &data->lr.ld_private; 6734 nfs_fattr_init(data->res.fattr); 6735 data->timestamp = jiffies; 6736 data->rpc_status = 0; 6737 data->inode = nfs_igrab_and_active(inode); 6738 if (data->inode || issync) { 6739 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6740 cred); 6741 if (data->lr.roc) { 6742 data->args.lr_args = &data->lr.arg; 6743 data->res.lr_res = &data->lr.res; 6744 } 6745 } 6746 6747 if (!data->inode) 6748 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6749 1); 6750 else 6751 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6752 0); 6753 task_setup_data.callback_data = data; 6754 msg.rpc_argp = &data->args; 6755 msg.rpc_resp = &data->res; 6756 task = rpc_run_task(&task_setup_data); 6757 if (IS_ERR(task)) 6758 return PTR_ERR(task); 6759 if (!issync) 6760 goto out; 6761 status = rpc_wait_for_completion_task(task); 6762 if (status != 0) 6763 goto out; 6764 status = data->rpc_status; 6765 out: 6766 rpc_put_task(task); 6767 return status; 6768 } 6769 6770 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6771 { 6772 struct nfs_server *server = NFS_SERVER(inode); 6773 struct nfs4_exception exception = { }; 6774 int err; 6775 do { 6776 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6777 trace_nfs4_delegreturn(inode, stateid, err); 6778 switch (err) { 6779 case -NFS4ERR_STALE_STATEID: 6780 case -NFS4ERR_EXPIRED: 6781 case 0: 6782 return 0; 6783 } 6784 err = nfs4_handle_exception(server, err, &exception); 6785 } while (exception.retry); 6786 return err; 6787 } 6788 6789 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6790 { 6791 struct inode *inode = state->inode; 6792 struct nfs_server *server = NFS_SERVER(inode); 6793 struct nfs_client *clp = server->nfs_client; 6794 struct nfs_lockt_args arg = { 6795 .fh = NFS_FH(inode), 6796 .fl = request, 6797 }; 6798 struct nfs_lockt_res res = { 6799 .denied = request, 6800 }; 6801 struct rpc_message msg = { 6802 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6803 .rpc_argp = &arg, 6804 .rpc_resp = &res, 6805 .rpc_cred = state->owner->so_cred, 6806 }; 6807 struct nfs4_lock_state *lsp; 6808 int status; 6809 6810 arg.lock_owner.clientid = clp->cl_clientid; 6811 status = nfs4_set_lock_state(state, request); 6812 if (status != 0) 6813 goto out; 6814 lsp = request->fl_u.nfs4_fl.owner; 6815 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6816 arg.lock_owner.s_dev = server->s_dev; 6817 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6818 switch (status) { 6819 case 0: 6820 request->c.flc_type = F_UNLCK; 6821 break; 6822 case -NFS4ERR_DENIED: 6823 status = 0; 6824 } 6825 request->fl_ops->fl_release_private(request); 6826 request->fl_ops = NULL; 6827 out: 6828 return status; 6829 } 6830 6831 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6832 { 6833 struct nfs4_exception exception = { 6834 .interruptible = true, 6835 }; 6836 int err; 6837 6838 do { 6839 err = _nfs4_proc_getlk(state, cmd, request); 6840 trace_nfs4_get_lock(request, state, cmd, err); 6841 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6842 &exception); 6843 } while (exception.retry); 6844 return err; 6845 } 6846 6847 /* 6848 * Update the seqid of a lock stateid after receiving 6849 * NFS4ERR_OLD_STATEID 6850 */ 6851 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6852 struct nfs4_lock_state *lsp) 6853 { 6854 struct nfs4_state *state = lsp->ls_state; 6855 bool ret = false; 6856 6857 spin_lock(&state->state_lock); 6858 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6859 goto out; 6860 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6861 nfs4_stateid_seqid_inc(dst); 6862 else 6863 dst->seqid = lsp->ls_stateid.seqid; 6864 ret = true; 6865 out: 6866 spin_unlock(&state->state_lock); 6867 return ret; 6868 } 6869 6870 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6871 struct nfs4_lock_state *lsp) 6872 { 6873 struct nfs4_state *state = lsp->ls_state; 6874 bool ret; 6875 6876 spin_lock(&state->state_lock); 6877 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6878 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6879 spin_unlock(&state->state_lock); 6880 return ret; 6881 } 6882 6883 struct nfs4_unlockdata { 6884 struct nfs_locku_args arg; 6885 struct nfs_locku_res res; 6886 struct nfs4_lock_state *lsp; 6887 struct nfs_open_context *ctx; 6888 struct nfs_lock_context *l_ctx; 6889 struct file_lock fl; 6890 struct nfs_server *server; 6891 unsigned long timestamp; 6892 }; 6893 6894 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6895 struct nfs_open_context *ctx, 6896 struct nfs4_lock_state *lsp, 6897 struct nfs_seqid *seqid) 6898 { 6899 struct nfs4_unlockdata *p; 6900 struct nfs4_state *state = lsp->ls_state; 6901 struct inode *inode = state->inode; 6902 6903 p = kzalloc(sizeof(*p), GFP_KERNEL); 6904 if (p == NULL) 6905 return NULL; 6906 p->arg.fh = NFS_FH(inode); 6907 p->arg.fl = &p->fl; 6908 p->arg.seqid = seqid; 6909 p->res.seqid = seqid; 6910 p->lsp = lsp; 6911 /* Ensure we don't close file until we're done freeing locks! */ 6912 p->ctx = get_nfs_open_context(ctx); 6913 p->l_ctx = nfs_get_lock_context(ctx); 6914 locks_init_lock(&p->fl); 6915 locks_copy_lock(&p->fl, fl); 6916 p->server = NFS_SERVER(inode); 6917 spin_lock(&state->state_lock); 6918 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6919 spin_unlock(&state->state_lock); 6920 return p; 6921 } 6922 6923 static void nfs4_locku_release_calldata(void *data) 6924 { 6925 struct nfs4_unlockdata *calldata = data; 6926 nfs_free_seqid(calldata->arg.seqid); 6927 nfs4_put_lock_state(calldata->lsp); 6928 nfs_put_lock_context(calldata->l_ctx); 6929 put_nfs_open_context(calldata->ctx); 6930 kfree(calldata); 6931 } 6932 6933 static void nfs4_locku_done(struct rpc_task *task, void *data) 6934 { 6935 struct nfs4_unlockdata *calldata = data; 6936 struct nfs4_exception exception = { 6937 .inode = calldata->lsp->ls_state->inode, 6938 .stateid = &calldata->arg.stateid, 6939 }; 6940 6941 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6942 return; 6943 switch (task->tk_status) { 6944 case 0: 6945 renew_lease(calldata->server, calldata->timestamp); 6946 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6947 if (nfs4_update_lock_stateid(calldata->lsp, 6948 &calldata->res.stateid)) 6949 break; 6950 fallthrough; 6951 case -NFS4ERR_ADMIN_REVOKED: 6952 case -NFS4ERR_EXPIRED: 6953 nfs4_free_revoked_stateid(calldata->server, 6954 &calldata->arg.stateid, 6955 task->tk_msg.rpc_cred); 6956 fallthrough; 6957 case -NFS4ERR_BAD_STATEID: 6958 case -NFS4ERR_STALE_STATEID: 6959 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6960 calldata->lsp)) 6961 rpc_restart_call_prepare(task); 6962 break; 6963 case -NFS4ERR_OLD_STATEID: 6964 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6965 calldata->lsp)) 6966 rpc_restart_call_prepare(task); 6967 break; 6968 default: 6969 task->tk_status = nfs4_async_handle_exception(task, 6970 calldata->server, task->tk_status, 6971 &exception); 6972 if (exception.retry) 6973 rpc_restart_call_prepare(task); 6974 } 6975 nfs_release_seqid(calldata->arg.seqid); 6976 } 6977 6978 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6979 { 6980 struct nfs4_unlockdata *calldata = data; 6981 6982 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6983 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6984 return; 6985 6986 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6987 goto out_wait; 6988 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6989 /* Note: exit _without_ running nfs4_locku_done */ 6990 goto out_no_action; 6991 } 6992 calldata->timestamp = jiffies; 6993 if (nfs4_setup_sequence(calldata->server->nfs_client, 6994 &calldata->arg.seq_args, 6995 &calldata->res.seq_res, 6996 task) != 0) 6997 nfs_release_seqid(calldata->arg.seqid); 6998 return; 6999 out_no_action: 7000 task->tk_action = NULL; 7001 out_wait: 7002 nfs4_sequence_done(task, &calldata->res.seq_res); 7003 } 7004 7005 static const struct rpc_call_ops nfs4_locku_ops = { 7006 .rpc_call_prepare = nfs4_locku_prepare, 7007 .rpc_call_done = nfs4_locku_done, 7008 .rpc_release = nfs4_locku_release_calldata, 7009 }; 7010 7011 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 7012 struct nfs_open_context *ctx, 7013 struct nfs4_lock_state *lsp, 7014 struct nfs_seqid *seqid) 7015 { 7016 struct nfs4_unlockdata *data; 7017 struct rpc_message msg = { 7018 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 7019 .rpc_cred = ctx->cred, 7020 }; 7021 struct rpc_task_setup task_setup_data = { 7022 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 7023 .rpc_message = &msg, 7024 .callback_ops = &nfs4_locku_ops, 7025 .workqueue = nfsiod_workqueue, 7026 .flags = RPC_TASK_ASYNC, 7027 }; 7028 7029 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 7030 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7031 7032 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 7033 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 7034 7035 /* Ensure this is an unlock - when canceling a lock, the 7036 * canceled lock is passed in, and it won't be an unlock. 7037 */ 7038 fl->c.flc_type = F_UNLCK; 7039 if (fl->c.flc_flags & FL_CLOSE) 7040 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 7041 7042 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7043 if (data == NULL) { 7044 nfs_free_seqid(seqid); 7045 return ERR_PTR(-ENOMEM); 7046 } 7047 7048 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7049 msg.rpc_argp = &data->arg; 7050 msg.rpc_resp = &data->res; 7051 task_setup_data.callback_data = data; 7052 return rpc_run_task(&task_setup_data); 7053 } 7054 7055 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7056 { 7057 struct inode *inode = state->inode; 7058 struct nfs4_state_owner *sp = state->owner; 7059 struct nfs_inode *nfsi = NFS_I(inode); 7060 struct nfs_seqid *seqid; 7061 struct nfs4_lock_state *lsp; 7062 struct rpc_task *task; 7063 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7064 int status = 0; 7065 unsigned char saved_flags = request->c.flc_flags; 7066 7067 status = nfs4_set_lock_state(state, request); 7068 /* Unlock _before_ we do the RPC call */ 7069 request->c.flc_flags |= FL_EXISTS; 7070 /* Exclude nfs_delegation_claim_locks() */ 7071 mutex_lock(&sp->so_delegreturn_mutex); 7072 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7073 down_read(&nfsi->rwsem); 7074 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7075 up_read(&nfsi->rwsem); 7076 mutex_unlock(&sp->so_delegreturn_mutex); 7077 goto out; 7078 } 7079 lsp = request->fl_u.nfs4_fl.owner; 7080 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7081 up_read(&nfsi->rwsem); 7082 mutex_unlock(&sp->so_delegreturn_mutex); 7083 if (status != 0) 7084 goto out; 7085 /* Is this a delegated lock? */ 7086 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7087 goto out; 7088 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7089 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7090 status = -ENOMEM; 7091 if (IS_ERR(seqid)) 7092 goto out; 7093 task = nfs4_do_unlck(request, 7094 nfs_file_open_context(request->c.flc_file), 7095 lsp, seqid); 7096 status = PTR_ERR(task); 7097 if (IS_ERR(task)) 7098 goto out; 7099 status = rpc_wait_for_completion_task(task); 7100 rpc_put_task(task); 7101 out: 7102 request->c.flc_flags = saved_flags; 7103 trace_nfs4_unlock(request, state, F_SETLK, status); 7104 return status; 7105 } 7106 7107 struct nfs4_lockdata { 7108 struct nfs_lock_args arg; 7109 struct nfs_lock_res res; 7110 struct nfs4_lock_state *lsp; 7111 struct nfs_open_context *ctx; 7112 struct file_lock fl; 7113 unsigned long timestamp; 7114 int rpc_status; 7115 int cancelled; 7116 struct nfs_server *server; 7117 }; 7118 7119 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7120 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7121 gfp_t gfp_mask) 7122 { 7123 struct nfs4_lockdata *p; 7124 struct inode *inode = lsp->ls_state->inode; 7125 struct nfs_server *server = NFS_SERVER(inode); 7126 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7127 7128 p = kzalloc(sizeof(*p), gfp_mask); 7129 if (p == NULL) 7130 return NULL; 7131 7132 p->arg.fh = NFS_FH(inode); 7133 p->arg.fl = &p->fl; 7134 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7135 if (IS_ERR(p->arg.open_seqid)) 7136 goto out_free; 7137 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7138 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7139 if (IS_ERR(p->arg.lock_seqid)) 7140 goto out_free_seqid; 7141 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7142 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7143 p->arg.lock_owner.s_dev = server->s_dev; 7144 p->res.lock_seqid = p->arg.lock_seqid; 7145 p->lsp = lsp; 7146 p->server = server; 7147 p->ctx = get_nfs_open_context(ctx); 7148 locks_init_lock(&p->fl); 7149 locks_copy_lock(&p->fl, fl); 7150 return p; 7151 out_free_seqid: 7152 nfs_free_seqid(p->arg.open_seqid); 7153 out_free: 7154 kfree(p); 7155 return NULL; 7156 } 7157 7158 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7159 { 7160 struct nfs4_lockdata *data = calldata; 7161 struct nfs4_state *state = data->lsp->ls_state; 7162 7163 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7164 goto out_wait; 7165 /* Do we need to do an open_to_lock_owner? */ 7166 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7167 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7168 goto out_release_lock_seqid; 7169 } 7170 nfs4_stateid_copy(&data->arg.open_stateid, 7171 &state->open_stateid); 7172 data->arg.new_lock_owner = 1; 7173 data->res.open_seqid = data->arg.open_seqid; 7174 } else { 7175 data->arg.new_lock_owner = 0; 7176 nfs4_stateid_copy(&data->arg.lock_stateid, 7177 &data->lsp->ls_stateid); 7178 } 7179 if (!nfs4_valid_open_stateid(state)) { 7180 data->rpc_status = -EBADF; 7181 task->tk_action = NULL; 7182 goto out_release_open_seqid; 7183 } 7184 data->timestamp = jiffies; 7185 if (nfs4_setup_sequence(data->server->nfs_client, 7186 &data->arg.seq_args, 7187 &data->res.seq_res, 7188 task) == 0) 7189 return; 7190 out_release_open_seqid: 7191 nfs_release_seqid(data->arg.open_seqid); 7192 out_release_lock_seqid: 7193 nfs_release_seqid(data->arg.lock_seqid); 7194 out_wait: 7195 nfs4_sequence_done(task, &data->res.seq_res); 7196 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7197 } 7198 7199 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7200 { 7201 struct nfs4_lockdata *data = calldata; 7202 struct nfs4_lock_state *lsp = data->lsp; 7203 7204 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7205 return; 7206 7207 data->rpc_status = task->tk_status; 7208 switch (task->tk_status) { 7209 case 0: 7210 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7211 data->timestamp); 7212 if (data->arg.new_lock && !data->cancelled) { 7213 data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS); 7214 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7215 goto out_restart; 7216 } 7217 if (data->arg.new_lock_owner != 0) { 7218 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7219 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7220 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7221 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7222 goto out_restart; 7223 break; 7224 case -NFS4ERR_OLD_STATEID: 7225 if (data->arg.new_lock_owner != 0 && 7226 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7227 lsp->ls_state)) 7228 goto out_restart; 7229 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7230 goto out_restart; 7231 fallthrough; 7232 case -NFS4ERR_BAD_STATEID: 7233 case -NFS4ERR_STALE_STATEID: 7234 case -NFS4ERR_EXPIRED: 7235 if (data->arg.new_lock_owner != 0) { 7236 if (!nfs4_stateid_match(&data->arg.open_stateid, 7237 &lsp->ls_state->open_stateid)) 7238 goto out_restart; 7239 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7240 &lsp->ls_stateid)) 7241 goto out_restart; 7242 } 7243 out_done: 7244 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7245 return; 7246 out_restart: 7247 if (!data->cancelled) 7248 rpc_restart_call_prepare(task); 7249 goto out_done; 7250 } 7251 7252 static void nfs4_lock_release(void *calldata) 7253 { 7254 struct nfs4_lockdata *data = calldata; 7255 7256 nfs_free_seqid(data->arg.open_seqid); 7257 if (data->cancelled && data->rpc_status == 0) { 7258 struct rpc_task *task; 7259 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7260 data->arg.lock_seqid); 7261 if (!IS_ERR(task)) 7262 rpc_put_task_async(task); 7263 dprintk("%s: cancelling lock!\n", __func__); 7264 } else 7265 nfs_free_seqid(data->arg.lock_seqid); 7266 nfs4_put_lock_state(data->lsp); 7267 put_nfs_open_context(data->ctx); 7268 kfree(data); 7269 } 7270 7271 static const struct rpc_call_ops nfs4_lock_ops = { 7272 .rpc_call_prepare = nfs4_lock_prepare, 7273 .rpc_call_done = nfs4_lock_done, 7274 .rpc_release = nfs4_lock_release, 7275 }; 7276 7277 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7278 { 7279 switch (error) { 7280 case -NFS4ERR_ADMIN_REVOKED: 7281 case -NFS4ERR_EXPIRED: 7282 case -NFS4ERR_BAD_STATEID: 7283 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7284 if (new_lock_owner != 0 || 7285 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7286 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7287 break; 7288 case -NFS4ERR_STALE_STATEID: 7289 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7290 nfs4_schedule_lease_recovery(server->nfs_client); 7291 } 7292 } 7293 7294 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7295 { 7296 struct nfs4_lockdata *data; 7297 struct rpc_task *task; 7298 struct rpc_message msg = { 7299 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7300 .rpc_cred = state->owner->so_cred, 7301 }; 7302 struct rpc_task_setup task_setup_data = { 7303 .rpc_client = NFS_CLIENT(state->inode), 7304 .rpc_message = &msg, 7305 .callback_ops = &nfs4_lock_ops, 7306 .workqueue = nfsiod_workqueue, 7307 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7308 }; 7309 int ret; 7310 7311 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7312 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7313 7314 data = nfs4_alloc_lockdata(fl, 7315 nfs_file_open_context(fl->c.flc_file), 7316 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7317 if (data == NULL) 7318 return -ENOMEM; 7319 if (IS_SETLKW(cmd)) 7320 data->arg.block = 1; 7321 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7322 recovery_type > NFS_LOCK_NEW); 7323 msg.rpc_argp = &data->arg; 7324 msg.rpc_resp = &data->res; 7325 task_setup_data.callback_data = data; 7326 if (recovery_type > NFS_LOCK_NEW) { 7327 if (recovery_type == NFS_LOCK_RECLAIM) 7328 data->arg.reclaim = NFS_LOCK_RECLAIM; 7329 } else 7330 data->arg.new_lock = 1; 7331 task = rpc_run_task(&task_setup_data); 7332 if (IS_ERR(task)) 7333 return PTR_ERR(task); 7334 ret = rpc_wait_for_completion_task(task); 7335 if (ret == 0) { 7336 ret = data->rpc_status; 7337 if (ret) 7338 nfs4_handle_setlk_error(data->server, data->lsp, 7339 data->arg.new_lock_owner, ret); 7340 } else 7341 data->cancelled = true; 7342 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7343 rpc_put_task(task); 7344 dprintk("%s: ret = %d\n", __func__, ret); 7345 return ret; 7346 } 7347 7348 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7349 { 7350 struct nfs_server *server = NFS_SERVER(state->inode); 7351 struct nfs4_exception exception = { 7352 .inode = state->inode, 7353 }; 7354 int err; 7355 7356 do { 7357 /* Cache the lock if possible... */ 7358 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7359 return 0; 7360 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7361 if (err != -NFS4ERR_DELAY) 7362 break; 7363 nfs4_handle_exception(server, err, &exception); 7364 } while (exception.retry); 7365 return err; 7366 } 7367 7368 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7369 { 7370 struct nfs_server *server = NFS_SERVER(state->inode); 7371 struct nfs4_exception exception = { 7372 .inode = state->inode, 7373 }; 7374 int err; 7375 7376 err = nfs4_set_lock_state(state, request); 7377 if (err != 0) 7378 return err; 7379 if (!recover_lost_locks) { 7380 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7381 return 0; 7382 } 7383 do { 7384 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7385 return 0; 7386 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7387 switch (err) { 7388 default: 7389 goto out; 7390 case -NFS4ERR_GRACE: 7391 case -NFS4ERR_DELAY: 7392 nfs4_handle_exception(server, err, &exception); 7393 err = 0; 7394 } 7395 } while (exception.retry); 7396 out: 7397 return err; 7398 } 7399 7400 #if defined(CONFIG_NFS_V4_1) 7401 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7402 { 7403 struct nfs4_lock_state *lsp; 7404 int status; 7405 7406 status = nfs4_set_lock_state(state, request); 7407 if (status != 0) 7408 return status; 7409 lsp = request->fl_u.nfs4_fl.owner; 7410 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7411 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7412 return 0; 7413 return nfs4_lock_expired(state, request); 7414 } 7415 #endif 7416 7417 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7418 { 7419 struct nfs_inode *nfsi = NFS_I(state->inode); 7420 struct nfs4_state_owner *sp = state->owner; 7421 unsigned char flags = request->c.flc_flags; 7422 int status; 7423 7424 request->c.flc_flags |= FL_ACCESS; 7425 status = locks_lock_inode_wait(state->inode, request); 7426 if (status < 0) 7427 goto out; 7428 mutex_lock(&sp->so_delegreturn_mutex); 7429 down_read(&nfsi->rwsem); 7430 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7431 /* Yes: cache locks! */ 7432 /* ...but avoid races with delegation recall... */ 7433 request->c.flc_flags = flags & ~FL_SLEEP; 7434 status = locks_lock_inode_wait(state->inode, request); 7435 up_read(&nfsi->rwsem); 7436 mutex_unlock(&sp->so_delegreturn_mutex); 7437 goto out; 7438 } 7439 up_read(&nfsi->rwsem); 7440 mutex_unlock(&sp->so_delegreturn_mutex); 7441 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7442 out: 7443 request->c.flc_flags = flags; 7444 return status; 7445 } 7446 7447 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7448 { 7449 struct nfs4_exception exception = { 7450 .state = state, 7451 .inode = state->inode, 7452 .interruptible = true, 7453 }; 7454 int err; 7455 7456 do { 7457 err = _nfs4_proc_setlk(state, cmd, request); 7458 if (err == -NFS4ERR_DENIED) 7459 err = -EAGAIN; 7460 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7461 err, &exception); 7462 } while (exception.retry); 7463 return err; 7464 } 7465 7466 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7467 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7468 7469 static int 7470 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7471 struct file_lock *request) 7472 { 7473 int status = -ERESTARTSYS; 7474 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7475 7476 while(!signalled()) { 7477 status = nfs4_proc_setlk(state, cmd, request); 7478 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7479 break; 7480 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7481 schedule_timeout(timeout); 7482 timeout *= 2; 7483 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7484 status = -ERESTARTSYS; 7485 } 7486 return status; 7487 } 7488 7489 #ifdef CONFIG_NFS_V4_1 7490 struct nfs4_lock_waiter { 7491 struct inode *inode; 7492 struct nfs_lowner owner; 7493 wait_queue_entry_t wait; 7494 }; 7495 7496 static int 7497 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7498 { 7499 struct nfs4_lock_waiter *waiter = 7500 container_of(wait, struct nfs4_lock_waiter, wait); 7501 7502 /* NULL key means to wake up everyone */ 7503 if (key) { 7504 struct cb_notify_lock_args *cbnl = key; 7505 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7506 *wowner = &waiter->owner; 7507 7508 /* Only wake if the callback was for the same owner. */ 7509 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7510 return 0; 7511 7512 /* Make sure it's for the right inode */ 7513 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7514 return 0; 7515 } 7516 7517 return woken_wake_function(wait, mode, flags, key); 7518 } 7519 7520 static int 7521 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7522 { 7523 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7524 struct nfs_server *server = NFS_SERVER(state->inode); 7525 struct nfs_client *clp = server->nfs_client; 7526 wait_queue_head_t *q = &clp->cl_lock_waitq; 7527 struct nfs4_lock_waiter waiter = { 7528 .inode = state->inode, 7529 .owner = { .clientid = clp->cl_clientid, 7530 .id = lsp->ls_seqid.owner_id, 7531 .s_dev = server->s_dev }, 7532 }; 7533 int status; 7534 7535 /* Don't bother with waitqueue if we don't expect a callback */ 7536 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7537 return nfs4_retry_setlk_simple(state, cmd, request); 7538 7539 init_wait(&waiter.wait); 7540 waiter.wait.func = nfs4_wake_lock_waiter; 7541 add_wait_queue(q, &waiter.wait); 7542 7543 do { 7544 status = nfs4_proc_setlk(state, cmd, request); 7545 if (status != -EAGAIN || IS_SETLK(cmd)) 7546 break; 7547 7548 status = -ERESTARTSYS; 7549 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7550 NFS4_LOCK_MAXTIMEOUT); 7551 } while (!signalled()); 7552 7553 remove_wait_queue(q, &waiter.wait); 7554 7555 return status; 7556 } 7557 #else /* !CONFIG_NFS_V4_1 */ 7558 static inline int 7559 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7560 { 7561 return nfs4_retry_setlk_simple(state, cmd, request); 7562 } 7563 #endif 7564 7565 static int 7566 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7567 { 7568 struct nfs_open_context *ctx; 7569 struct nfs4_state *state; 7570 int status; 7571 7572 /* verify open state */ 7573 ctx = nfs_file_open_context(filp); 7574 state = ctx->state; 7575 7576 if (IS_GETLK(cmd)) { 7577 if (state != NULL) 7578 return nfs4_proc_getlk(state, F_GETLK, request); 7579 return 0; 7580 } 7581 7582 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7583 return -EINVAL; 7584 7585 if (lock_is_unlock(request)) { 7586 if (state != NULL) 7587 return nfs4_proc_unlck(state, cmd, request); 7588 return 0; 7589 } 7590 7591 if (state == NULL) 7592 return -ENOLCK; 7593 7594 if ((request->c.flc_flags & FL_POSIX) && 7595 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7596 return -ENOLCK; 7597 7598 /* 7599 * Don't rely on the VFS having checked the file open mode, 7600 * since it won't do this for flock() locks. 7601 */ 7602 switch (request->c.flc_type) { 7603 case F_RDLCK: 7604 if (!(filp->f_mode & FMODE_READ)) 7605 return -EBADF; 7606 break; 7607 case F_WRLCK: 7608 if (!(filp->f_mode & FMODE_WRITE)) 7609 return -EBADF; 7610 } 7611 7612 status = nfs4_set_lock_state(state, request); 7613 if (status != 0) 7614 return status; 7615 7616 return nfs4_retry_setlk(state, cmd, request); 7617 } 7618 7619 static int nfs4_delete_lease(struct file *file, void **priv) 7620 { 7621 return generic_setlease(file, F_UNLCK, NULL, priv); 7622 } 7623 7624 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease, 7625 void **priv) 7626 { 7627 struct inode *inode = file_inode(file); 7628 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7629 int ret; 7630 7631 /* No delegation, no lease */ 7632 if (!nfs4_have_delegation(inode, type)) 7633 return -EAGAIN; 7634 ret = generic_setlease(file, arg, lease, priv); 7635 if (ret || nfs4_have_delegation(inode, type)) 7636 return ret; 7637 /* We raced with a delegation return */ 7638 nfs4_delete_lease(file, priv); 7639 return -EAGAIN; 7640 } 7641 7642 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease, 7643 void **priv) 7644 { 7645 switch (arg) { 7646 case F_RDLCK: 7647 case F_WRLCK: 7648 return nfs4_add_lease(file, arg, lease, priv); 7649 case F_UNLCK: 7650 return nfs4_delete_lease(file, priv); 7651 default: 7652 return -EINVAL; 7653 } 7654 } 7655 7656 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7657 { 7658 struct nfs_server *server = NFS_SERVER(state->inode); 7659 int err; 7660 7661 err = nfs4_set_lock_state(state, fl); 7662 if (err != 0) 7663 return err; 7664 do { 7665 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7666 if (err != -NFS4ERR_DELAY) 7667 break; 7668 ssleep(1); 7669 } while (err == -NFS4ERR_DELAY); 7670 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7671 } 7672 7673 struct nfs_release_lockowner_data { 7674 struct nfs4_lock_state *lsp; 7675 struct nfs_server *server; 7676 struct nfs_release_lockowner_args args; 7677 struct nfs_release_lockowner_res res; 7678 unsigned long timestamp; 7679 }; 7680 7681 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7682 { 7683 struct nfs_release_lockowner_data *data = calldata; 7684 struct nfs_server *server = data->server; 7685 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7686 &data->res.seq_res, task); 7687 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7688 data->timestamp = jiffies; 7689 } 7690 7691 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7692 { 7693 struct nfs_release_lockowner_data *data = calldata; 7694 struct nfs_server *server = data->server; 7695 7696 nfs40_sequence_done(task, &data->res.seq_res); 7697 7698 switch (task->tk_status) { 7699 case 0: 7700 renew_lease(server, data->timestamp); 7701 break; 7702 case -NFS4ERR_STALE_CLIENTID: 7703 case -NFS4ERR_EXPIRED: 7704 nfs4_schedule_lease_recovery(server->nfs_client); 7705 break; 7706 case -NFS4ERR_LEASE_MOVED: 7707 case -NFS4ERR_DELAY: 7708 if (nfs4_async_handle_error(task, server, 7709 NULL, NULL) == -EAGAIN) 7710 rpc_restart_call_prepare(task); 7711 } 7712 } 7713 7714 static void nfs4_release_lockowner_release(void *calldata) 7715 { 7716 struct nfs_release_lockowner_data *data = calldata; 7717 nfs4_free_lock_state(data->server, data->lsp); 7718 kfree(calldata); 7719 } 7720 7721 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7722 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7723 .rpc_call_done = nfs4_release_lockowner_done, 7724 .rpc_release = nfs4_release_lockowner_release, 7725 }; 7726 7727 static void 7728 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7729 { 7730 struct nfs_release_lockowner_data *data; 7731 struct rpc_message msg = { 7732 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7733 }; 7734 7735 if (server->nfs_client->cl_mvops->minor_version != 0) 7736 return; 7737 7738 data = kmalloc(sizeof(*data), GFP_KERNEL); 7739 if (!data) 7740 return; 7741 data->lsp = lsp; 7742 data->server = server; 7743 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7744 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7745 data->args.lock_owner.s_dev = server->s_dev; 7746 7747 msg.rpc_argp = &data->args; 7748 msg.rpc_resp = &data->res; 7749 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7750 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7751 } 7752 7753 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7754 7755 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7756 struct mnt_idmap *idmap, 7757 struct dentry *unused, struct inode *inode, 7758 const char *key, const void *buf, 7759 size_t buflen, int flags) 7760 { 7761 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7762 } 7763 7764 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7765 struct dentry *unused, struct inode *inode, 7766 const char *key, void *buf, size_t buflen) 7767 { 7768 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7769 } 7770 7771 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7772 { 7773 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7774 } 7775 7776 #if defined(CONFIG_NFS_V4_1) 7777 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7778 7779 static int nfs4_xattr_set_nfs4_dacl(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 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7786 } 7787 7788 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7789 struct dentry *unused, struct inode *inode, 7790 const char *key, void *buf, size_t buflen) 7791 { 7792 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7793 } 7794 7795 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7796 { 7797 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7798 } 7799 7800 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7801 7802 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7803 struct mnt_idmap *idmap, 7804 struct dentry *unused, struct inode *inode, 7805 const char *key, const void *buf, 7806 size_t buflen, int flags) 7807 { 7808 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7809 } 7810 7811 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7812 struct dentry *unused, struct inode *inode, 7813 const char *key, void *buf, size_t buflen) 7814 { 7815 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7816 } 7817 7818 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7819 { 7820 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7821 } 7822 7823 #endif 7824 7825 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7826 7827 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7828 struct mnt_idmap *idmap, 7829 struct dentry *unused, struct inode *inode, 7830 const char *key, const void *buf, 7831 size_t buflen, int flags) 7832 { 7833 if (security_ismaclabel(key)) 7834 return nfs4_set_security_label(inode, buf, buflen); 7835 7836 return -EOPNOTSUPP; 7837 } 7838 7839 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7840 struct dentry *unused, struct inode *inode, 7841 const char *key, void *buf, size_t buflen) 7842 { 7843 if (security_ismaclabel(key)) 7844 return nfs4_get_security_label(inode, buf, buflen); 7845 return -EOPNOTSUPP; 7846 } 7847 7848 static ssize_t 7849 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7850 { 7851 int len = 0; 7852 7853 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7854 len = security_inode_listsecurity(inode, list, list_len); 7855 if (len >= 0 && list_len && len > list_len) 7856 return -ERANGE; 7857 } 7858 return len; 7859 } 7860 7861 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7862 .prefix = XATTR_SECURITY_PREFIX, 7863 .get = nfs4_xattr_get_nfs4_label, 7864 .set = nfs4_xattr_set_nfs4_label, 7865 }; 7866 7867 #else 7868 7869 static ssize_t 7870 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7871 { 7872 return 0; 7873 } 7874 7875 #endif 7876 7877 #ifdef CONFIG_NFS_V4_2 7878 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7879 struct mnt_idmap *idmap, 7880 struct dentry *unused, struct inode *inode, 7881 const char *key, const void *buf, 7882 size_t buflen, int flags) 7883 { 7884 u32 mask; 7885 int ret; 7886 7887 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7888 return -EOPNOTSUPP; 7889 7890 /* 7891 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7892 * flags right now. Handling of xattr operations use the normal 7893 * file read/write permissions. 7894 * 7895 * Just in case the server has other ideas (which RFC 8276 allows), 7896 * do a cached access check for the XA* flags to possibly avoid 7897 * doing an RPC and getting EACCES back. 7898 */ 7899 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7900 if (!(mask & NFS_ACCESS_XAWRITE)) 7901 return -EACCES; 7902 } 7903 7904 if (buf == NULL) { 7905 ret = nfs42_proc_removexattr(inode, key); 7906 if (!ret) 7907 nfs4_xattr_cache_remove(inode, key); 7908 } else { 7909 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7910 if (!ret) 7911 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7912 } 7913 7914 return ret; 7915 } 7916 7917 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7918 struct dentry *unused, struct inode *inode, 7919 const char *key, void *buf, size_t buflen) 7920 { 7921 u32 mask; 7922 ssize_t ret; 7923 7924 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7925 return -EOPNOTSUPP; 7926 7927 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7928 if (!(mask & NFS_ACCESS_XAREAD)) 7929 return -EACCES; 7930 } 7931 7932 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7933 if (ret) 7934 return ret; 7935 7936 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7937 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7938 return ret; 7939 7940 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7941 7942 return ret; 7943 } 7944 7945 static ssize_t 7946 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7947 { 7948 u64 cookie; 7949 bool eof; 7950 ssize_t ret, size; 7951 char *buf; 7952 size_t buflen; 7953 u32 mask; 7954 7955 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7956 return 0; 7957 7958 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7959 if (!(mask & NFS_ACCESS_XALIST)) 7960 return 0; 7961 } 7962 7963 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7964 if (ret) 7965 return ret; 7966 7967 ret = nfs4_xattr_cache_list(inode, list, list_len); 7968 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7969 return ret; 7970 7971 cookie = 0; 7972 eof = false; 7973 buflen = list_len ? list_len : XATTR_LIST_MAX; 7974 buf = list_len ? list : NULL; 7975 size = 0; 7976 7977 while (!eof) { 7978 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7979 &cookie, &eof); 7980 if (ret < 0) 7981 return ret; 7982 7983 if (list_len) { 7984 buf += ret; 7985 buflen -= ret; 7986 } 7987 size += ret; 7988 } 7989 7990 if (list_len) 7991 nfs4_xattr_cache_set_list(inode, list, size); 7992 7993 return size; 7994 } 7995 7996 #else 7997 7998 static ssize_t 7999 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 8000 { 8001 return 0; 8002 } 8003 #endif /* CONFIG_NFS_V4_2 */ 8004 8005 /* 8006 * nfs_fhget will use either the mounted_on_fileid or the fileid 8007 */ 8008 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 8009 { 8010 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 8011 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 8012 (fattr->valid & NFS_ATTR_FATTR_FSID) && 8013 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 8014 return; 8015 8016 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 8017 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 8018 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 8019 fattr->nlink = 2; 8020 } 8021 8022 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8023 const struct qstr *name, 8024 struct nfs4_fs_locations *fs_locations, 8025 struct page *page) 8026 { 8027 struct nfs_server *server = NFS_SERVER(dir); 8028 u32 bitmask[3]; 8029 struct nfs4_fs_locations_arg args = { 8030 .dir_fh = NFS_FH(dir), 8031 .name = name, 8032 .page = page, 8033 .bitmask = bitmask, 8034 }; 8035 struct nfs4_fs_locations_res res = { 8036 .fs_locations = fs_locations, 8037 }; 8038 struct rpc_message msg = { 8039 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8040 .rpc_argp = &args, 8041 .rpc_resp = &res, 8042 }; 8043 int status; 8044 8045 dprintk("%s: start\n", __func__); 8046 8047 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8048 bitmask[1] = nfs4_fattr_bitmap[1]; 8049 8050 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8051 * is not supported */ 8052 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8053 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8054 else 8055 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8056 8057 nfs_fattr_init(fs_locations->fattr); 8058 fs_locations->server = server; 8059 fs_locations->nlocations = 0; 8060 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8061 dprintk("%s: returned status = %d\n", __func__, status); 8062 return status; 8063 } 8064 8065 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8066 const struct qstr *name, 8067 struct nfs4_fs_locations *fs_locations, 8068 struct page *page) 8069 { 8070 struct nfs4_exception exception = { 8071 .interruptible = true, 8072 }; 8073 int err; 8074 do { 8075 err = _nfs4_proc_fs_locations(client, dir, name, 8076 fs_locations, page); 8077 trace_nfs4_get_fs_locations(dir, name, err); 8078 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8079 &exception); 8080 } while (exception.retry); 8081 return err; 8082 } 8083 8084 /* 8085 * This operation also signals the server that this client is 8086 * performing migration recovery. The server can stop returning 8087 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8088 * appended to this compound to identify the client ID which is 8089 * performing recovery. 8090 */ 8091 static int _nfs40_proc_get_locations(struct nfs_server *server, 8092 struct nfs_fh *fhandle, 8093 struct nfs4_fs_locations *locations, 8094 struct page *page, const struct cred *cred) 8095 { 8096 struct rpc_clnt *clnt = server->client; 8097 u32 bitmask[2] = { 8098 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8099 }; 8100 struct nfs4_fs_locations_arg args = { 8101 .clientid = server->nfs_client->cl_clientid, 8102 .fh = fhandle, 8103 .page = page, 8104 .bitmask = bitmask, 8105 .migration = 1, /* skip LOOKUP */ 8106 .renew = 1, /* append RENEW */ 8107 }; 8108 struct nfs4_fs_locations_res res = { 8109 .fs_locations = locations, 8110 .migration = 1, 8111 .renew = 1, 8112 }; 8113 struct rpc_message msg = { 8114 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8115 .rpc_argp = &args, 8116 .rpc_resp = &res, 8117 .rpc_cred = cred, 8118 }; 8119 unsigned long now = jiffies; 8120 int status; 8121 8122 nfs_fattr_init(locations->fattr); 8123 locations->server = server; 8124 locations->nlocations = 0; 8125 8126 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8127 status = nfs4_call_sync_sequence(clnt, server, &msg, 8128 &args.seq_args, &res.seq_res); 8129 if (status) 8130 return status; 8131 8132 renew_lease(server, now); 8133 return 0; 8134 } 8135 8136 #ifdef CONFIG_NFS_V4_1 8137 8138 /* 8139 * This operation also signals the server that this client is 8140 * performing migration recovery. The server can stop asserting 8141 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8142 * performing this operation is identified in the SEQUENCE 8143 * operation in this compound. 8144 * 8145 * When the client supports GETATTR(fs_locations_info), it can 8146 * be plumbed in here. 8147 */ 8148 static int _nfs41_proc_get_locations(struct nfs_server *server, 8149 struct nfs_fh *fhandle, 8150 struct nfs4_fs_locations *locations, 8151 struct page *page, const struct cred *cred) 8152 { 8153 struct rpc_clnt *clnt = server->client; 8154 u32 bitmask[2] = { 8155 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8156 }; 8157 struct nfs4_fs_locations_arg args = { 8158 .fh = fhandle, 8159 .page = page, 8160 .bitmask = bitmask, 8161 .migration = 1, /* skip LOOKUP */ 8162 }; 8163 struct nfs4_fs_locations_res res = { 8164 .fs_locations = locations, 8165 .migration = 1, 8166 }; 8167 struct rpc_message msg = { 8168 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8169 .rpc_argp = &args, 8170 .rpc_resp = &res, 8171 .rpc_cred = cred, 8172 }; 8173 struct nfs4_call_sync_data data = { 8174 .seq_server = server, 8175 .seq_args = &args.seq_args, 8176 .seq_res = &res.seq_res, 8177 }; 8178 struct rpc_task_setup task_setup_data = { 8179 .rpc_client = clnt, 8180 .rpc_message = &msg, 8181 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8182 .callback_data = &data, 8183 .flags = RPC_TASK_NO_ROUND_ROBIN, 8184 }; 8185 int status; 8186 8187 nfs_fattr_init(locations->fattr); 8188 locations->server = server; 8189 locations->nlocations = 0; 8190 8191 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8192 status = nfs4_call_sync_custom(&task_setup_data); 8193 if (status == NFS4_OK && 8194 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8195 status = -NFS4ERR_LEASE_MOVED; 8196 return status; 8197 } 8198 8199 #endif /* CONFIG_NFS_V4_1 */ 8200 8201 /** 8202 * nfs4_proc_get_locations - discover locations for a migrated FSID 8203 * @server: pointer to nfs_server to process 8204 * @fhandle: pointer to the kernel NFS client file handle 8205 * @locations: result of query 8206 * @page: buffer 8207 * @cred: credential to use for this operation 8208 * 8209 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8210 * operation failed, or a negative errno if a local error occurred. 8211 * 8212 * On success, "locations" is filled in, but if the server has 8213 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8214 * asserted. 8215 * 8216 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8217 * from this client that require migration recovery. 8218 */ 8219 int nfs4_proc_get_locations(struct nfs_server *server, 8220 struct nfs_fh *fhandle, 8221 struct nfs4_fs_locations *locations, 8222 struct page *page, const struct cred *cred) 8223 { 8224 struct nfs_client *clp = server->nfs_client; 8225 const struct nfs4_mig_recovery_ops *ops = 8226 clp->cl_mvops->mig_recovery_ops; 8227 struct nfs4_exception exception = { 8228 .interruptible = true, 8229 }; 8230 int status; 8231 8232 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8233 (unsigned long long)server->fsid.major, 8234 (unsigned long long)server->fsid.minor, 8235 clp->cl_hostname); 8236 nfs_display_fhandle(fhandle, __func__); 8237 8238 do { 8239 status = ops->get_locations(server, fhandle, locations, page, 8240 cred); 8241 if (status != -NFS4ERR_DELAY) 8242 break; 8243 nfs4_handle_exception(server, status, &exception); 8244 } while (exception.retry); 8245 return status; 8246 } 8247 8248 /* 8249 * This operation also signals the server that this client is 8250 * performing "lease moved" recovery. The server can stop 8251 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8252 * is appended to this compound to identify the client ID which is 8253 * performing recovery. 8254 */ 8255 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8256 { 8257 struct nfs_server *server = NFS_SERVER(inode); 8258 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8259 struct rpc_clnt *clnt = server->client; 8260 struct nfs4_fsid_present_arg args = { 8261 .fh = NFS_FH(inode), 8262 .clientid = clp->cl_clientid, 8263 .renew = 1, /* append RENEW */ 8264 }; 8265 struct nfs4_fsid_present_res res = { 8266 .renew = 1, 8267 }; 8268 struct rpc_message msg = { 8269 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8270 .rpc_argp = &args, 8271 .rpc_resp = &res, 8272 .rpc_cred = cred, 8273 }; 8274 unsigned long now = jiffies; 8275 int status; 8276 8277 res.fh = nfs_alloc_fhandle(); 8278 if (res.fh == NULL) 8279 return -ENOMEM; 8280 8281 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8282 status = nfs4_call_sync_sequence(clnt, server, &msg, 8283 &args.seq_args, &res.seq_res); 8284 nfs_free_fhandle(res.fh); 8285 if (status) 8286 return status; 8287 8288 do_renew_lease(clp, now); 8289 return 0; 8290 } 8291 8292 #ifdef CONFIG_NFS_V4_1 8293 8294 /* 8295 * This operation also signals the server that this client is 8296 * performing "lease moved" recovery. The server can stop asserting 8297 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8298 * this operation is identified in the SEQUENCE operation in this 8299 * compound. 8300 */ 8301 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8302 { 8303 struct nfs_server *server = NFS_SERVER(inode); 8304 struct rpc_clnt *clnt = server->client; 8305 struct nfs4_fsid_present_arg args = { 8306 .fh = NFS_FH(inode), 8307 }; 8308 struct nfs4_fsid_present_res res = { 8309 }; 8310 struct rpc_message msg = { 8311 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8312 .rpc_argp = &args, 8313 .rpc_resp = &res, 8314 .rpc_cred = cred, 8315 }; 8316 int status; 8317 8318 res.fh = nfs_alloc_fhandle(); 8319 if (res.fh == NULL) 8320 return -ENOMEM; 8321 8322 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8323 status = nfs4_call_sync_sequence(clnt, server, &msg, 8324 &args.seq_args, &res.seq_res); 8325 nfs_free_fhandle(res.fh); 8326 if (status == NFS4_OK && 8327 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8328 status = -NFS4ERR_LEASE_MOVED; 8329 return status; 8330 } 8331 8332 #endif /* CONFIG_NFS_V4_1 */ 8333 8334 /** 8335 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8336 * @inode: inode on FSID to check 8337 * @cred: credential to use for this operation 8338 * 8339 * Server indicates whether the FSID is present, moved, or not 8340 * recognized. This operation is necessary to clear a LEASE_MOVED 8341 * condition for this client ID. 8342 * 8343 * Returns NFS4_OK if the FSID is present on this server, 8344 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8345 * NFS4ERR code if some error occurred on the server, or a 8346 * negative errno if a local failure occurred. 8347 */ 8348 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8349 { 8350 struct nfs_server *server = NFS_SERVER(inode); 8351 struct nfs_client *clp = server->nfs_client; 8352 const struct nfs4_mig_recovery_ops *ops = 8353 clp->cl_mvops->mig_recovery_ops; 8354 struct nfs4_exception exception = { 8355 .interruptible = true, 8356 }; 8357 int status; 8358 8359 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8360 (unsigned long long)server->fsid.major, 8361 (unsigned long long)server->fsid.minor, 8362 clp->cl_hostname); 8363 nfs_display_fhandle(NFS_FH(inode), __func__); 8364 8365 do { 8366 status = ops->fsid_present(inode, cred); 8367 if (status != -NFS4ERR_DELAY) 8368 break; 8369 nfs4_handle_exception(server, status, &exception); 8370 } while (exception.retry); 8371 return status; 8372 } 8373 8374 /* 8375 * If 'use_integrity' is true and the state managment nfs_client 8376 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8377 * and the machine credential as per RFC3530bis and RFC5661 Security 8378 * Considerations sections. Otherwise, just use the user cred with the 8379 * filesystem's rpc_client. 8380 */ 8381 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8382 { 8383 int status; 8384 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8385 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8386 struct nfs4_secinfo_arg args = { 8387 .dir_fh = NFS_FH(dir), 8388 .name = name, 8389 }; 8390 struct nfs4_secinfo_res res = { 8391 .flavors = flavors, 8392 }; 8393 struct rpc_message msg = { 8394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8395 .rpc_argp = &args, 8396 .rpc_resp = &res, 8397 }; 8398 struct nfs4_call_sync_data data = { 8399 .seq_server = NFS_SERVER(dir), 8400 .seq_args = &args.seq_args, 8401 .seq_res = &res.seq_res, 8402 }; 8403 struct rpc_task_setup task_setup = { 8404 .rpc_client = clnt, 8405 .rpc_message = &msg, 8406 .callback_ops = clp->cl_mvops->call_sync_ops, 8407 .callback_data = &data, 8408 .flags = RPC_TASK_NO_ROUND_ROBIN, 8409 }; 8410 const struct cred *cred = NULL; 8411 8412 if (use_integrity) { 8413 clnt = clp->cl_rpcclient; 8414 task_setup.rpc_client = clnt; 8415 8416 cred = nfs4_get_clid_cred(clp); 8417 msg.rpc_cred = cred; 8418 } 8419 8420 dprintk("NFS call secinfo %s\n", name->name); 8421 8422 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8423 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8424 status = nfs4_call_sync_custom(&task_setup); 8425 8426 dprintk("NFS reply secinfo: %d\n", status); 8427 8428 put_cred(cred); 8429 return status; 8430 } 8431 8432 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8433 struct nfs4_secinfo_flavors *flavors) 8434 { 8435 struct nfs4_exception exception = { 8436 .interruptible = true, 8437 }; 8438 int err; 8439 do { 8440 err = -NFS4ERR_WRONGSEC; 8441 8442 /* try to use integrity protection with machine cred */ 8443 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8444 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8445 8446 /* 8447 * if unable to use integrity protection, or SECINFO with 8448 * integrity protection returns NFS4ERR_WRONGSEC (which is 8449 * disallowed by spec, but exists in deployed servers) use 8450 * the current filesystem's rpc_client and the user cred. 8451 */ 8452 if (err == -NFS4ERR_WRONGSEC) 8453 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8454 8455 trace_nfs4_secinfo(dir, name, err); 8456 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8457 &exception); 8458 } while (exception.retry); 8459 return err; 8460 } 8461 8462 #ifdef CONFIG_NFS_V4_1 8463 /* 8464 * Check the exchange flags returned by the server for invalid flags, having 8465 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8466 * DS flags set. 8467 */ 8468 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8469 { 8470 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8471 goto out_inval; 8472 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8473 goto out_inval; 8474 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8475 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8476 goto out_inval; 8477 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8478 goto out_inval; 8479 return NFS_OK; 8480 out_inval: 8481 return -NFS4ERR_INVAL; 8482 } 8483 8484 static bool 8485 nfs41_same_server_scope(struct nfs41_server_scope *a, 8486 struct nfs41_server_scope *b) 8487 { 8488 if (a->server_scope_sz != b->server_scope_sz) 8489 return false; 8490 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8491 } 8492 8493 static void 8494 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8495 { 8496 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8497 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8498 struct nfs_client *clp = args->client; 8499 8500 switch (task->tk_status) { 8501 case -NFS4ERR_BADSESSION: 8502 case -NFS4ERR_DEADSESSION: 8503 nfs4_schedule_session_recovery(clp->cl_session, 8504 task->tk_status); 8505 return; 8506 } 8507 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8508 res->dir != NFS4_CDFS4_BOTH) { 8509 rpc_task_close_connection(task); 8510 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8511 rpc_restart_call(task); 8512 } 8513 } 8514 8515 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8516 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8517 }; 8518 8519 /* 8520 * nfs4_proc_bind_one_conn_to_session() 8521 * 8522 * The 4.1 client currently uses the same TCP connection for the 8523 * fore and backchannel. 8524 */ 8525 static 8526 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8527 struct rpc_xprt *xprt, 8528 struct nfs_client *clp, 8529 const struct cred *cred) 8530 { 8531 int status; 8532 struct nfs41_bind_conn_to_session_args args = { 8533 .client = clp, 8534 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8535 .retries = 0, 8536 }; 8537 struct nfs41_bind_conn_to_session_res res; 8538 struct rpc_message msg = { 8539 .rpc_proc = 8540 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8541 .rpc_argp = &args, 8542 .rpc_resp = &res, 8543 .rpc_cred = cred, 8544 }; 8545 struct rpc_task_setup task_setup_data = { 8546 .rpc_client = clnt, 8547 .rpc_xprt = xprt, 8548 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8549 .rpc_message = &msg, 8550 .flags = RPC_TASK_TIMEOUT, 8551 }; 8552 struct rpc_task *task; 8553 8554 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8555 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8556 args.dir = NFS4_CDFC4_FORE; 8557 8558 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8559 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8560 args.dir = NFS4_CDFC4_FORE; 8561 8562 task = rpc_run_task(&task_setup_data); 8563 if (!IS_ERR(task)) { 8564 status = task->tk_status; 8565 rpc_put_task(task); 8566 } else 8567 status = PTR_ERR(task); 8568 trace_nfs4_bind_conn_to_session(clp, status); 8569 if (status == 0) { 8570 if (memcmp(res.sessionid.data, 8571 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8572 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8573 return -EIO; 8574 } 8575 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8576 dprintk("NFS: %s: Unexpected direction from server\n", 8577 __func__); 8578 return -EIO; 8579 } 8580 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8581 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8582 __func__); 8583 return -EIO; 8584 } 8585 } 8586 8587 return status; 8588 } 8589 8590 struct rpc_bind_conn_calldata { 8591 struct nfs_client *clp; 8592 const struct cred *cred; 8593 }; 8594 8595 static int 8596 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8597 struct rpc_xprt *xprt, 8598 void *calldata) 8599 { 8600 struct rpc_bind_conn_calldata *p = calldata; 8601 8602 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8603 } 8604 8605 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8606 { 8607 struct rpc_bind_conn_calldata data = { 8608 .clp = clp, 8609 .cred = cred, 8610 }; 8611 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8612 nfs4_proc_bind_conn_to_session_callback, &data); 8613 } 8614 8615 /* 8616 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8617 * and operations we'd like to see to enable certain features in the allow map 8618 */ 8619 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8620 .how = SP4_MACH_CRED, 8621 .enforce.u.words = { 8622 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8623 1 << (OP_EXCHANGE_ID - 32) | 8624 1 << (OP_CREATE_SESSION - 32) | 8625 1 << (OP_DESTROY_SESSION - 32) | 8626 1 << (OP_DESTROY_CLIENTID - 32) 8627 }, 8628 .allow.u.words = { 8629 [0] = 1 << (OP_CLOSE) | 8630 1 << (OP_OPEN_DOWNGRADE) | 8631 1 << (OP_LOCKU) | 8632 1 << (OP_DELEGRETURN) | 8633 1 << (OP_COMMIT), 8634 [1] = 1 << (OP_SECINFO - 32) | 8635 1 << (OP_SECINFO_NO_NAME - 32) | 8636 1 << (OP_LAYOUTRETURN - 32) | 8637 1 << (OP_TEST_STATEID - 32) | 8638 1 << (OP_FREE_STATEID - 32) | 8639 1 << (OP_WRITE - 32) 8640 } 8641 }; 8642 8643 /* 8644 * Select the state protection mode for client `clp' given the server results 8645 * from exchange_id in `sp'. 8646 * 8647 * Returns 0 on success, negative errno otherwise. 8648 */ 8649 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8650 struct nfs41_state_protection *sp) 8651 { 8652 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8653 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8654 1 << (OP_EXCHANGE_ID - 32) | 8655 1 << (OP_CREATE_SESSION - 32) | 8656 1 << (OP_DESTROY_SESSION - 32) | 8657 1 << (OP_DESTROY_CLIENTID - 32) 8658 }; 8659 unsigned long flags = 0; 8660 unsigned int i; 8661 int ret = 0; 8662 8663 if (sp->how == SP4_MACH_CRED) { 8664 /* Print state protect result */ 8665 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8666 for (i = 0; i <= LAST_NFS4_OP; i++) { 8667 if (test_bit(i, sp->enforce.u.longs)) 8668 dfprintk(MOUNT, " enforce op %d\n", i); 8669 if (test_bit(i, sp->allow.u.longs)) 8670 dfprintk(MOUNT, " allow op %d\n", i); 8671 } 8672 8673 /* make sure nothing is on enforce list that isn't supported */ 8674 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8675 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8676 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8677 ret = -EINVAL; 8678 goto out; 8679 } 8680 } 8681 8682 /* 8683 * Minimal mode - state operations are allowed to use machine 8684 * credential. Note this already happens by default, so the 8685 * client doesn't have to do anything more than the negotiation. 8686 * 8687 * NOTE: we don't care if EXCHANGE_ID is in the list - 8688 * we're already using the machine cred for exchange_id 8689 * and will never use a different cred. 8690 */ 8691 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8692 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8693 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8694 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8695 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8696 dfprintk(MOUNT, " minimal mode enabled\n"); 8697 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8698 } else { 8699 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8700 ret = -EINVAL; 8701 goto out; 8702 } 8703 8704 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8705 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8706 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8707 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8708 dfprintk(MOUNT, " cleanup mode enabled\n"); 8709 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8710 } 8711 8712 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8713 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8714 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8715 } 8716 8717 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8718 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8719 dfprintk(MOUNT, " secinfo mode enabled\n"); 8720 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8721 } 8722 8723 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8724 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8725 dfprintk(MOUNT, " stateid mode enabled\n"); 8726 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8727 } 8728 8729 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8730 dfprintk(MOUNT, " write mode enabled\n"); 8731 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8732 } 8733 8734 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8735 dfprintk(MOUNT, " commit mode enabled\n"); 8736 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8737 } 8738 } 8739 out: 8740 clp->cl_sp4_flags = flags; 8741 return ret; 8742 } 8743 8744 struct nfs41_exchange_id_data { 8745 struct nfs41_exchange_id_res res; 8746 struct nfs41_exchange_id_args args; 8747 }; 8748 8749 static void nfs4_exchange_id_release(void *data) 8750 { 8751 struct nfs41_exchange_id_data *cdata = 8752 (struct nfs41_exchange_id_data *)data; 8753 8754 nfs_put_client(cdata->args.client); 8755 kfree(cdata->res.impl_id); 8756 kfree(cdata->res.server_scope); 8757 kfree(cdata->res.server_owner); 8758 kfree(cdata); 8759 } 8760 8761 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8762 .rpc_release = nfs4_exchange_id_release, 8763 }; 8764 8765 /* 8766 * _nfs4_proc_exchange_id() 8767 * 8768 * Wrapper for EXCHANGE_ID operation. 8769 */ 8770 static struct rpc_task * 8771 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8772 u32 sp4_how, struct rpc_xprt *xprt) 8773 { 8774 struct rpc_message msg = { 8775 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8776 .rpc_cred = cred, 8777 }; 8778 struct rpc_task_setup task_setup_data = { 8779 .rpc_client = clp->cl_rpcclient, 8780 .callback_ops = &nfs4_exchange_id_call_ops, 8781 .rpc_message = &msg, 8782 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8783 }; 8784 struct nfs41_exchange_id_data *calldata; 8785 int status; 8786 8787 if (!refcount_inc_not_zero(&clp->cl_count)) 8788 return ERR_PTR(-EIO); 8789 8790 status = -ENOMEM; 8791 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8792 if (!calldata) 8793 goto out; 8794 8795 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8796 8797 status = nfs4_init_uniform_client_string(clp); 8798 if (status) 8799 goto out_calldata; 8800 8801 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8802 GFP_NOFS); 8803 status = -ENOMEM; 8804 if (unlikely(calldata->res.server_owner == NULL)) 8805 goto out_calldata; 8806 8807 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8808 GFP_NOFS); 8809 if (unlikely(calldata->res.server_scope == NULL)) 8810 goto out_server_owner; 8811 8812 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8813 if (unlikely(calldata->res.impl_id == NULL)) 8814 goto out_server_scope; 8815 8816 switch (sp4_how) { 8817 case SP4_NONE: 8818 calldata->args.state_protect.how = SP4_NONE; 8819 break; 8820 8821 case SP4_MACH_CRED: 8822 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8823 break; 8824 8825 default: 8826 /* unsupported! */ 8827 WARN_ON_ONCE(1); 8828 status = -EINVAL; 8829 goto out_impl_id; 8830 } 8831 if (xprt) { 8832 task_setup_data.rpc_xprt = xprt; 8833 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8834 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8835 sizeof(calldata->args.verifier.data)); 8836 } 8837 calldata->args.client = clp; 8838 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8839 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8840 #ifdef CONFIG_NFS_V4_1_MIGRATION 8841 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8842 #endif 8843 if (test_bit(NFS_CS_DS, &clp->cl_flags)) 8844 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8845 msg.rpc_argp = &calldata->args; 8846 msg.rpc_resp = &calldata->res; 8847 task_setup_data.callback_data = calldata; 8848 8849 return rpc_run_task(&task_setup_data); 8850 8851 out_impl_id: 8852 kfree(calldata->res.impl_id); 8853 out_server_scope: 8854 kfree(calldata->res.server_scope); 8855 out_server_owner: 8856 kfree(calldata->res.server_owner); 8857 out_calldata: 8858 kfree(calldata); 8859 out: 8860 nfs_put_client(clp); 8861 return ERR_PTR(status); 8862 } 8863 8864 /* 8865 * _nfs4_proc_exchange_id() 8866 * 8867 * Wrapper for EXCHANGE_ID operation. 8868 */ 8869 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8870 u32 sp4_how) 8871 { 8872 struct rpc_task *task; 8873 struct nfs41_exchange_id_args *argp; 8874 struct nfs41_exchange_id_res *resp; 8875 unsigned long now = jiffies; 8876 int status; 8877 8878 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8879 if (IS_ERR(task)) 8880 return PTR_ERR(task); 8881 8882 argp = task->tk_msg.rpc_argp; 8883 resp = task->tk_msg.rpc_resp; 8884 status = task->tk_status; 8885 if (status != 0) 8886 goto out; 8887 8888 status = nfs4_check_cl_exchange_flags(resp->flags, 8889 clp->cl_mvops->minor_version); 8890 if (status != 0) 8891 goto out; 8892 8893 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8894 if (status != 0) 8895 goto out; 8896 8897 do_renew_lease(clp, now); 8898 8899 clp->cl_clientid = resp->clientid; 8900 clp->cl_exchange_flags = resp->flags; 8901 clp->cl_seqid = resp->seqid; 8902 /* Client ID is not confirmed */ 8903 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8904 clear_bit(NFS4_SESSION_ESTABLISHED, 8905 &clp->cl_session->session_state); 8906 8907 if (clp->cl_serverscope != NULL && 8908 !nfs41_same_server_scope(clp->cl_serverscope, 8909 resp->server_scope)) { 8910 dprintk("%s: server_scope mismatch detected\n", 8911 __func__); 8912 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8913 } 8914 8915 swap(clp->cl_serverowner, resp->server_owner); 8916 swap(clp->cl_serverscope, resp->server_scope); 8917 swap(clp->cl_implid, resp->impl_id); 8918 8919 /* Save the EXCHANGE_ID verifier session trunk tests */ 8920 memcpy(clp->cl_confirm.data, argp->verifier.data, 8921 sizeof(clp->cl_confirm.data)); 8922 out: 8923 trace_nfs4_exchange_id(clp, status); 8924 rpc_put_task(task); 8925 return status; 8926 } 8927 8928 /* 8929 * nfs4_proc_exchange_id() 8930 * 8931 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8932 * 8933 * Since the clientid has expired, all compounds using sessions 8934 * associated with the stale clientid will be returning 8935 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8936 * be in some phase of session reset. 8937 * 8938 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8939 */ 8940 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8941 { 8942 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8943 int status; 8944 8945 /* try SP4_MACH_CRED if krb5i/p */ 8946 if (authflavor == RPC_AUTH_GSS_KRB5I || 8947 authflavor == RPC_AUTH_GSS_KRB5P) { 8948 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8949 if (!status) 8950 return 0; 8951 } 8952 8953 /* try SP4_NONE */ 8954 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8955 } 8956 8957 /** 8958 * nfs4_test_session_trunk 8959 * 8960 * This is an add_xprt_test() test function called from 8961 * rpc_clnt_setup_test_and_add_xprt. 8962 * 8963 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8964 * and is dereferrenced in nfs4_exchange_id_release 8965 * 8966 * Upon success, add the new transport to the rpc_clnt 8967 * 8968 * @clnt: struct rpc_clnt to get new transport 8969 * @xprt: the rpc_xprt to test 8970 * @data: call data for _nfs4_proc_exchange_id. 8971 */ 8972 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8973 void *data) 8974 { 8975 struct nfs4_add_xprt_data *adata = data; 8976 struct rpc_task *task; 8977 int status; 8978 8979 u32 sp4_how; 8980 8981 dprintk("--> %s try %s\n", __func__, 8982 xprt->address_strings[RPC_DISPLAY_ADDR]); 8983 8984 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8985 8986 try_again: 8987 /* Test connection for session trunking. Async exchange_id call */ 8988 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8989 if (IS_ERR(task)) 8990 return; 8991 8992 status = task->tk_status; 8993 if (status == 0) { 8994 status = nfs4_detect_session_trunking(adata->clp, 8995 task->tk_msg.rpc_resp, xprt); 8996 trace_nfs4_trunked_exchange_id(adata->clp, 8997 xprt->address_strings[RPC_DISPLAY_ADDR], status); 8998 } 8999 if (status == 0) 9000 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 9001 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt, 9002 (struct sockaddr *)&xprt->addr)) 9003 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 9004 9005 rpc_put_task(task); 9006 if (status == -NFS4ERR_DELAY) { 9007 ssleep(1); 9008 goto try_again; 9009 } 9010 } 9011 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 9012 9013 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 9014 const struct cred *cred) 9015 { 9016 struct rpc_message msg = { 9017 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 9018 .rpc_argp = clp, 9019 .rpc_cred = cred, 9020 }; 9021 int status; 9022 9023 status = rpc_call_sync(clp->cl_rpcclient, &msg, 9024 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9025 trace_nfs4_destroy_clientid(clp, status); 9026 if (status) 9027 dprintk("NFS: Got error %d from the server %s on " 9028 "DESTROY_CLIENTID.", status, clp->cl_hostname); 9029 return status; 9030 } 9031 9032 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 9033 const struct cred *cred) 9034 { 9035 unsigned int loop; 9036 int ret; 9037 9038 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 9039 ret = _nfs4_proc_destroy_clientid(clp, cred); 9040 switch (ret) { 9041 case -NFS4ERR_DELAY: 9042 case -NFS4ERR_CLIENTID_BUSY: 9043 ssleep(1); 9044 break; 9045 default: 9046 return ret; 9047 } 9048 } 9049 return 0; 9050 } 9051 9052 int nfs4_destroy_clientid(struct nfs_client *clp) 9053 { 9054 const struct cred *cred; 9055 int ret = 0; 9056 9057 if (clp->cl_mvops->minor_version < 1) 9058 goto out; 9059 if (clp->cl_exchange_flags == 0) 9060 goto out; 9061 if (clp->cl_preserve_clid) 9062 goto out; 9063 cred = nfs4_get_clid_cred(clp); 9064 ret = nfs4_proc_destroy_clientid(clp, cred); 9065 put_cred(cred); 9066 switch (ret) { 9067 case 0: 9068 case -NFS4ERR_STALE_CLIENTID: 9069 clp->cl_exchange_flags = 0; 9070 } 9071 out: 9072 return ret; 9073 } 9074 9075 #endif /* CONFIG_NFS_V4_1 */ 9076 9077 struct nfs4_get_lease_time_data { 9078 struct nfs4_get_lease_time_args *args; 9079 struct nfs4_get_lease_time_res *res; 9080 struct nfs_client *clp; 9081 }; 9082 9083 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9084 void *calldata) 9085 { 9086 struct nfs4_get_lease_time_data *data = 9087 (struct nfs4_get_lease_time_data *)calldata; 9088 9089 /* just setup sequence, do not trigger session recovery 9090 since we're invoked within one */ 9091 nfs4_setup_sequence(data->clp, 9092 &data->args->la_seq_args, 9093 &data->res->lr_seq_res, 9094 task); 9095 } 9096 9097 /* 9098 * Called from nfs4_state_manager thread for session setup, so don't recover 9099 * from sequence operation or clientid errors. 9100 */ 9101 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9102 { 9103 struct nfs4_get_lease_time_data *data = 9104 (struct nfs4_get_lease_time_data *)calldata; 9105 9106 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9107 return; 9108 switch (task->tk_status) { 9109 case -NFS4ERR_DELAY: 9110 case -NFS4ERR_GRACE: 9111 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9112 task->tk_status = 0; 9113 fallthrough; 9114 case -NFS4ERR_RETRY_UNCACHED_REP: 9115 rpc_restart_call_prepare(task); 9116 return; 9117 } 9118 } 9119 9120 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9121 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9122 .rpc_call_done = nfs4_get_lease_time_done, 9123 }; 9124 9125 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9126 { 9127 struct nfs4_get_lease_time_args args; 9128 struct nfs4_get_lease_time_res res = { 9129 .lr_fsinfo = fsinfo, 9130 }; 9131 struct nfs4_get_lease_time_data data = { 9132 .args = &args, 9133 .res = &res, 9134 .clp = clp, 9135 }; 9136 struct rpc_message msg = { 9137 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9138 .rpc_argp = &args, 9139 .rpc_resp = &res, 9140 }; 9141 struct rpc_task_setup task_setup = { 9142 .rpc_client = clp->cl_rpcclient, 9143 .rpc_message = &msg, 9144 .callback_ops = &nfs4_get_lease_time_ops, 9145 .callback_data = &data, 9146 .flags = RPC_TASK_TIMEOUT, 9147 }; 9148 9149 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9150 return nfs4_call_sync_custom(&task_setup); 9151 } 9152 9153 #ifdef CONFIG_NFS_V4_1 9154 9155 /* 9156 * Initialize the values to be used by the client in CREATE_SESSION 9157 * If nfs4_init_session set the fore channel request and response sizes, 9158 * use them. 9159 * 9160 * Set the back channel max_resp_sz_cached to zero to force the client to 9161 * always set csa_cachethis to FALSE because the current implementation 9162 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9163 */ 9164 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9165 struct rpc_clnt *clnt) 9166 { 9167 unsigned int max_rqst_sz, max_resp_sz; 9168 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9169 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9170 9171 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9172 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9173 9174 /* Fore channel attributes */ 9175 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9176 args->fc_attrs.max_resp_sz = max_resp_sz; 9177 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9178 args->fc_attrs.max_reqs = max_session_slots; 9179 9180 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9181 "max_ops=%u max_reqs=%u\n", 9182 __func__, 9183 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9184 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9185 9186 /* Back channel attributes */ 9187 args->bc_attrs.max_rqst_sz = max_bc_payload; 9188 args->bc_attrs.max_resp_sz = max_bc_payload; 9189 args->bc_attrs.max_resp_sz_cached = 0; 9190 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9191 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9192 if (args->bc_attrs.max_reqs > max_bc_slots) 9193 args->bc_attrs.max_reqs = max_bc_slots; 9194 9195 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9196 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9197 __func__, 9198 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9199 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9200 args->bc_attrs.max_reqs); 9201 } 9202 9203 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9204 struct nfs41_create_session_res *res) 9205 { 9206 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9207 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9208 9209 if (rcvd->max_resp_sz > sent->max_resp_sz) 9210 return -EINVAL; 9211 /* 9212 * Our requested max_ops is the minimum we need; we're not 9213 * prepared to break up compounds into smaller pieces than that. 9214 * So, no point even trying to continue if the server won't 9215 * cooperate: 9216 */ 9217 if (rcvd->max_ops < sent->max_ops) 9218 return -EINVAL; 9219 if (rcvd->max_reqs == 0) 9220 return -EINVAL; 9221 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9222 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9223 return 0; 9224 } 9225 9226 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9227 struct nfs41_create_session_res *res) 9228 { 9229 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9230 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9231 9232 if (!(res->flags & SESSION4_BACK_CHAN)) 9233 goto out; 9234 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9235 return -EINVAL; 9236 if (rcvd->max_resp_sz < sent->max_resp_sz) 9237 return -EINVAL; 9238 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9239 return -EINVAL; 9240 if (rcvd->max_ops > sent->max_ops) 9241 return -EINVAL; 9242 if (rcvd->max_reqs > sent->max_reqs) 9243 return -EINVAL; 9244 out: 9245 return 0; 9246 } 9247 9248 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9249 struct nfs41_create_session_res *res) 9250 { 9251 int ret; 9252 9253 ret = nfs4_verify_fore_channel_attrs(args, res); 9254 if (ret) 9255 return ret; 9256 return nfs4_verify_back_channel_attrs(args, res); 9257 } 9258 9259 static void nfs4_update_session(struct nfs4_session *session, 9260 struct nfs41_create_session_res *res) 9261 { 9262 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9263 /* Mark client id and session as being confirmed */ 9264 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9265 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9266 session->flags = res->flags; 9267 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9268 if (res->flags & SESSION4_BACK_CHAN) 9269 memcpy(&session->bc_attrs, &res->bc_attrs, 9270 sizeof(session->bc_attrs)); 9271 } 9272 9273 static int _nfs4_proc_create_session(struct nfs_client *clp, 9274 const struct cred *cred) 9275 { 9276 struct nfs4_session *session = clp->cl_session; 9277 struct nfs41_create_session_args args = { 9278 .client = clp, 9279 .clientid = clp->cl_clientid, 9280 .seqid = clp->cl_seqid, 9281 .cb_program = NFS4_CALLBACK, 9282 }; 9283 struct nfs41_create_session_res res; 9284 9285 struct rpc_message msg = { 9286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9287 .rpc_argp = &args, 9288 .rpc_resp = &res, 9289 .rpc_cred = cred, 9290 }; 9291 int status; 9292 9293 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9294 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9295 9296 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9297 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9298 trace_nfs4_create_session(clp, status); 9299 9300 switch (status) { 9301 case -NFS4ERR_STALE_CLIENTID: 9302 case -NFS4ERR_DELAY: 9303 case -ETIMEDOUT: 9304 case -EACCES: 9305 case -EAGAIN: 9306 goto out; 9307 } 9308 9309 clp->cl_seqid++; 9310 if (!status) { 9311 /* Verify the session's negotiated channel_attrs values */ 9312 status = nfs4_verify_channel_attrs(&args, &res); 9313 /* Increment the clientid slot sequence id */ 9314 if (status) 9315 goto out; 9316 nfs4_update_session(session, &res); 9317 } 9318 out: 9319 return status; 9320 } 9321 9322 /* 9323 * Issues a CREATE_SESSION operation to the server. 9324 * It is the responsibility of the caller to verify the session is 9325 * expired before calling this routine. 9326 */ 9327 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9328 { 9329 int status; 9330 unsigned *ptr; 9331 struct nfs4_session *session = clp->cl_session; 9332 struct nfs4_add_xprt_data xprtdata = { 9333 .clp = clp, 9334 }; 9335 struct rpc_add_xprt_test rpcdata = { 9336 .add_xprt_test = clp->cl_mvops->session_trunk, 9337 .data = &xprtdata, 9338 }; 9339 9340 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9341 9342 status = _nfs4_proc_create_session(clp, cred); 9343 if (status) 9344 goto out; 9345 9346 /* Init or reset the session slot tables */ 9347 status = nfs4_setup_session_slot_tables(session); 9348 dprintk("slot table setup returned %d\n", status); 9349 if (status) 9350 goto out; 9351 9352 ptr = (unsigned *)&session->sess_id.data[0]; 9353 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9354 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9355 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9356 out: 9357 return status; 9358 } 9359 9360 /* 9361 * Issue the over-the-wire RPC DESTROY_SESSION. 9362 * The caller must serialize access to this routine. 9363 */ 9364 int nfs4_proc_destroy_session(struct nfs4_session *session, 9365 const struct cred *cred) 9366 { 9367 struct rpc_message msg = { 9368 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9369 .rpc_argp = session, 9370 .rpc_cred = cred, 9371 }; 9372 int status = 0; 9373 9374 /* session is still being setup */ 9375 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9376 return 0; 9377 9378 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9379 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9380 trace_nfs4_destroy_session(session->clp, status); 9381 9382 if (status) 9383 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9384 "Session has been destroyed regardless...\n", status); 9385 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9386 return status; 9387 } 9388 9389 /* 9390 * Renew the cl_session lease. 9391 */ 9392 struct nfs4_sequence_data { 9393 struct nfs_client *clp; 9394 struct nfs4_sequence_args args; 9395 struct nfs4_sequence_res res; 9396 }; 9397 9398 static void nfs41_sequence_release(void *data) 9399 { 9400 struct nfs4_sequence_data *calldata = data; 9401 struct nfs_client *clp = calldata->clp; 9402 9403 if (refcount_read(&clp->cl_count) > 1) 9404 nfs4_schedule_state_renewal(clp); 9405 nfs_put_client(clp); 9406 kfree(calldata); 9407 } 9408 9409 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9410 { 9411 switch(task->tk_status) { 9412 case -NFS4ERR_DELAY: 9413 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9414 return -EAGAIN; 9415 default: 9416 nfs4_schedule_lease_recovery(clp); 9417 } 9418 return 0; 9419 } 9420 9421 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9422 { 9423 struct nfs4_sequence_data *calldata = data; 9424 struct nfs_client *clp = calldata->clp; 9425 9426 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9427 return; 9428 9429 trace_nfs4_sequence(clp, task->tk_status); 9430 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9431 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9432 if (refcount_read(&clp->cl_count) == 1) 9433 return; 9434 9435 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9436 rpc_restart_call_prepare(task); 9437 return; 9438 } 9439 } 9440 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9441 } 9442 9443 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9444 { 9445 struct nfs4_sequence_data *calldata = data; 9446 struct nfs_client *clp = calldata->clp; 9447 struct nfs4_sequence_args *args; 9448 struct nfs4_sequence_res *res; 9449 9450 args = task->tk_msg.rpc_argp; 9451 res = task->tk_msg.rpc_resp; 9452 9453 nfs4_setup_sequence(clp, args, res, task); 9454 } 9455 9456 static const struct rpc_call_ops nfs41_sequence_ops = { 9457 .rpc_call_done = nfs41_sequence_call_done, 9458 .rpc_call_prepare = nfs41_sequence_prepare, 9459 .rpc_release = nfs41_sequence_release, 9460 }; 9461 9462 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9463 const struct cred *cred, 9464 struct nfs4_slot *slot, 9465 bool is_privileged) 9466 { 9467 struct nfs4_sequence_data *calldata; 9468 struct rpc_message msg = { 9469 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9470 .rpc_cred = cred, 9471 }; 9472 struct rpc_task_setup task_setup_data = { 9473 .rpc_client = clp->cl_rpcclient, 9474 .rpc_message = &msg, 9475 .callback_ops = &nfs41_sequence_ops, 9476 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9477 }; 9478 struct rpc_task *ret; 9479 9480 ret = ERR_PTR(-EIO); 9481 if (!refcount_inc_not_zero(&clp->cl_count)) 9482 goto out_err; 9483 9484 ret = ERR_PTR(-ENOMEM); 9485 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9486 if (calldata == NULL) 9487 goto out_put_clp; 9488 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9489 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9490 msg.rpc_argp = &calldata->args; 9491 msg.rpc_resp = &calldata->res; 9492 calldata->clp = clp; 9493 task_setup_data.callback_data = calldata; 9494 9495 ret = rpc_run_task(&task_setup_data); 9496 if (IS_ERR(ret)) 9497 goto out_err; 9498 return ret; 9499 out_put_clp: 9500 nfs_put_client(clp); 9501 out_err: 9502 nfs41_release_slot(slot); 9503 return ret; 9504 } 9505 9506 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9507 { 9508 struct rpc_task *task; 9509 int ret = 0; 9510 9511 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9512 return -EAGAIN; 9513 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9514 if (IS_ERR(task)) 9515 ret = PTR_ERR(task); 9516 else 9517 rpc_put_task_async(task); 9518 dprintk("<-- %s status=%d\n", __func__, ret); 9519 return ret; 9520 } 9521 9522 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9523 { 9524 struct rpc_task *task; 9525 int ret; 9526 9527 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9528 if (IS_ERR(task)) { 9529 ret = PTR_ERR(task); 9530 goto out; 9531 } 9532 ret = rpc_wait_for_completion_task(task); 9533 if (!ret) 9534 ret = task->tk_status; 9535 rpc_put_task(task); 9536 out: 9537 dprintk("<-- %s status=%d\n", __func__, ret); 9538 return ret; 9539 } 9540 9541 struct nfs4_reclaim_complete_data { 9542 struct nfs_client *clp; 9543 struct nfs41_reclaim_complete_args arg; 9544 struct nfs41_reclaim_complete_res res; 9545 }; 9546 9547 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9548 { 9549 struct nfs4_reclaim_complete_data *calldata = data; 9550 9551 nfs4_setup_sequence(calldata->clp, 9552 &calldata->arg.seq_args, 9553 &calldata->res.seq_res, 9554 task); 9555 } 9556 9557 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9558 { 9559 switch(task->tk_status) { 9560 case 0: 9561 wake_up_all(&clp->cl_lock_waitq); 9562 fallthrough; 9563 case -NFS4ERR_COMPLETE_ALREADY: 9564 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9565 break; 9566 case -NFS4ERR_DELAY: 9567 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9568 fallthrough; 9569 case -NFS4ERR_RETRY_UNCACHED_REP: 9570 case -EACCES: 9571 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9572 __func__, task->tk_status, clp->cl_hostname); 9573 return -EAGAIN; 9574 case -NFS4ERR_BADSESSION: 9575 case -NFS4ERR_DEADSESSION: 9576 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9577 break; 9578 default: 9579 nfs4_schedule_lease_recovery(clp); 9580 } 9581 return 0; 9582 } 9583 9584 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9585 { 9586 struct nfs4_reclaim_complete_data *calldata = data; 9587 struct nfs_client *clp = calldata->clp; 9588 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9589 9590 if (!nfs41_sequence_done(task, res)) 9591 return; 9592 9593 trace_nfs4_reclaim_complete(clp, task->tk_status); 9594 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9595 rpc_restart_call_prepare(task); 9596 return; 9597 } 9598 } 9599 9600 static void nfs4_free_reclaim_complete_data(void *data) 9601 { 9602 struct nfs4_reclaim_complete_data *calldata = data; 9603 9604 kfree(calldata); 9605 } 9606 9607 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9608 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9609 .rpc_call_done = nfs4_reclaim_complete_done, 9610 .rpc_release = nfs4_free_reclaim_complete_data, 9611 }; 9612 9613 /* 9614 * Issue a global reclaim complete. 9615 */ 9616 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9617 const struct cred *cred) 9618 { 9619 struct nfs4_reclaim_complete_data *calldata; 9620 struct rpc_message msg = { 9621 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9622 .rpc_cred = cred, 9623 }; 9624 struct rpc_task_setup task_setup_data = { 9625 .rpc_client = clp->cl_rpcclient, 9626 .rpc_message = &msg, 9627 .callback_ops = &nfs4_reclaim_complete_call_ops, 9628 .flags = RPC_TASK_NO_ROUND_ROBIN, 9629 }; 9630 int status = -ENOMEM; 9631 9632 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9633 if (calldata == NULL) 9634 goto out; 9635 calldata->clp = clp; 9636 calldata->arg.one_fs = 0; 9637 9638 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9639 msg.rpc_argp = &calldata->arg; 9640 msg.rpc_resp = &calldata->res; 9641 task_setup_data.callback_data = calldata; 9642 status = nfs4_call_sync_custom(&task_setup_data); 9643 out: 9644 dprintk("<-- %s status=%d\n", __func__, status); 9645 return status; 9646 } 9647 9648 static void 9649 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9650 { 9651 struct nfs4_layoutget *lgp = calldata; 9652 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9653 9654 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9655 &lgp->res.seq_res, task); 9656 } 9657 9658 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9659 { 9660 struct nfs4_layoutget *lgp = calldata; 9661 9662 nfs41_sequence_process(task, &lgp->res.seq_res); 9663 } 9664 9665 static int 9666 nfs4_layoutget_handle_exception(struct rpc_task *task, 9667 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9668 { 9669 struct inode *inode = lgp->args.inode; 9670 struct nfs_server *server = NFS_SERVER(inode); 9671 struct pnfs_layout_hdr *lo = lgp->lo; 9672 int nfs4err = task->tk_status; 9673 int err, status = 0; 9674 LIST_HEAD(head); 9675 9676 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9677 9678 nfs4_sequence_free_slot(&lgp->res.seq_res); 9679 9680 exception->state = NULL; 9681 exception->stateid = NULL; 9682 9683 switch (nfs4err) { 9684 case 0: 9685 goto out; 9686 9687 /* 9688 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9689 * on the file. set tk_status to -ENODATA to tell upper layer to 9690 * retry go inband. 9691 */ 9692 case -NFS4ERR_LAYOUTUNAVAILABLE: 9693 status = -ENODATA; 9694 goto out; 9695 /* 9696 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9697 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9698 */ 9699 case -NFS4ERR_BADLAYOUT: 9700 status = -EOVERFLOW; 9701 goto out; 9702 /* 9703 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9704 * (or clients) writing to the same RAID stripe except when 9705 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9706 * 9707 * Treat it like we would RECALLCONFLICT -- we retry for a little 9708 * while, and then eventually give up. 9709 */ 9710 case -NFS4ERR_LAYOUTTRYLATER: 9711 if (lgp->args.minlength == 0) { 9712 status = -EOVERFLOW; 9713 goto out; 9714 } 9715 status = -EBUSY; 9716 break; 9717 case -NFS4ERR_RECALLCONFLICT: 9718 case -NFS4ERR_RETURNCONFLICT: 9719 status = -ERECALLCONFLICT; 9720 break; 9721 case -NFS4ERR_DELEG_REVOKED: 9722 case -NFS4ERR_ADMIN_REVOKED: 9723 case -NFS4ERR_EXPIRED: 9724 case -NFS4ERR_BAD_STATEID: 9725 exception->timeout = 0; 9726 spin_lock(&inode->i_lock); 9727 /* If the open stateid was bad, then recover it. */ 9728 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9729 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9730 spin_unlock(&inode->i_lock); 9731 exception->state = lgp->args.ctx->state; 9732 exception->stateid = &lgp->args.stateid; 9733 break; 9734 } 9735 9736 /* 9737 * Mark the bad layout state as invalid, then retry 9738 */ 9739 pnfs_mark_layout_stateid_invalid(lo, &head); 9740 spin_unlock(&inode->i_lock); 9741 nfs_commit_inode(inode, 0); 9742 pnfs_free_lseg_list(&head); 9743 status = -EAGAIN; 9744 goto out; 9745 } 9746 9747 err = nfs4_handle_exception(server, nfs4err, exception); 9748 if (!status) { 9749 if (exception->retry) 9750 status = -EAGAIN; 9751 else 9752 status = err; 9753 } 9754 out: 9755 return status; 9756 } 9757 9758 size_t max_response_pages(struct nfs_server *server) 9759 { 9760 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9761 return nfs_page_array_len(0, max_resp_sz); 9762 } 9763 9764 static void nfs4_layoutget_release(void *calldata) 9765 { 9766 struct nfs4_layoutget *lgp = calldata; 9767 9768 nfs4_sequence_free_slot(&lgp->res.seq_res); 9769 pnfs_layoutget_free(lgp); 9770 } 9771 9772 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9773 .rpc_call_prepare = nfs4_layoutget_prepare, 9774 .rpc_call_done = nfs4_layoutget_done, 9775 .rpc_release = nfs4_layoutget_release, 9776 }; 9777 9778 struct pnfs_layout_segment * 9779 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, 9780 struct nfs4_exception *exception) 9781 { 9782 struct inode *inode = lgp->args.inode; 9783 struct nfs_server *server = NFS_SERVER(inode); 9784 struct rpc_task *task; 9785 struct rpc_message msg = { 9786 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9787 .rpc_argp = &lgp->args, 9788 .rpc_resp = &lgp->res, 9789 .rpc_cred = lgp->cred, 9790 }; 9791 struct rpc_task_setup task_setup_data = { 9792 .rpc_client = server->client, 9793 .rpc_message = &msg, 9794 .callback_ops = &nfs4_layoutget_call_ops, 9795 .callback_data = lgp, 9796 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9797 RPC_TASK_MOVEABLE, 9798 }; 9799 struct pnfs_layout_segment *lseg = NULL; 9800 int status = 0; 9801 9802 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9803 exception->retry = 0; 9804 9805 task = rpc_run_task(&task_setup_data); 9806 if (IS_ERR(task)) 9807 return ERR_CAST(task); 9808 9809 status = rpc_wait_for_completion_task(task); 9810 if (status != 0) 9811 goto out; 9812 9813 if (task->tk_status < 0) { 9814 exception->retry = 1; 9815 status = nfs4_layoutget_handle_exception(task, lgp, exception); 9816 } else if (lgp->res.layoutp->len == 0) { 9817 exception->retry = 1; 9818 status = -EAGAIN; 9819 nfs4_update_delay(&exception->timeout); 9820 } else 9821 lseg = pnfs_layout_process(lgp); 9822 out: 9823 trace_nfs4_layoutget(lgp->args.ctx, 9824 &lgp->args.range, 9825 &lgp->res.range, 9826 &lgp->res.stateid, 9827 status); 9828 9829 rpc_put_task(task); 9830 dprintk("<-- %s status=%d\n", __func__, status); 9831 if (status) 9832 return ERR_PTR(status); 9833 return lseg; 9834 } 9835 9836 static void 9837 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9838 { 9839 struct nfs4_layoutreturn *lrp = calldata; 9840 9841 nfs4_setup_sequence(lrp->clp, 9842 &lrp->args.seq_args, 9843 &lrp->res.seq_res, 9844 task); 9845 if (!pnfs_layout_is_valid(lrp->args.layout)) 9846 rpc_exit(task, 0); 9847 } 9848 9849 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9850 { 9851 struct nfs4_layoutreturn *lrp = calldata; 9852 struct nfs_server *server; 9853 9854 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9855 return; 9856 9857 /* 9858 * Was there an RPC level error? Assume the call succeeded, 9859 * and that we need to release the layout 9860 */ 9861 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9862 lrp->res.lrs_present = 0; 9863 return; 9864 } 9865 9866 server = NFS_SERVER(lrp->args.inode); 9867 switch (task->tk_status) { 9868 case -NFS4ERR_OLD_STATEID: 9869 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9870 &lrp->args.range, 9871 lrp->args.inode)) 9872 goto out_restart; 9873 fallthrough; 9874 default: 9875 task->tk_status = 0; 9876 fallthrough; 9877 case 0: 9878 break; 9879 case -NFS4ERR_DELAY: 9880 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9881 break; 9882 goto out_restart; 9883 } 9884 return; 9885 out_restart: 9886 task->tk_status = 0; 9887 nfs4_sequence_free_slot(&lrp->res.seq_res); 9888 rpc_restart_call_prepare(task); 9889 } 9890 9891 static void nfs4_layoutreturn_release(void *calldata) 9892 { 9893 struct nfs4_layoutreturn *lrp = calldata; 9894 struct pnfs_layout_hdr *lo = lrp->args.layout; 9895 9896 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9897 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9898 nfs4_sequence_free_slot(&lrp->res.seq_res); 9899 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9900 lrp->ld_private.ops->free(&lrp->ld_private); 9901 pnfs_put_layout_hdr(lrp->args.layout); 9902 nfs_iput_and_deactive(lrp->inode); 9903 put_cred(lrp->cred); 9904 kfree(calldata); 9905 } 9906 9907 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9908 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9909 .rpc_call_done = nfs4_layoutreturn_done, 9910 .rpc_release = nfs4_layoutreturn_release, 9911 }; 9912 9913 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9914 { 9915 struct rpc_task *task; 9916 struct rpc_message msg = { 9917 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9918 .rpc_argp = &lrp->args, 9919 .rpc_resp = &lrp->res, 9920 .rpc_cred = lrp->cred, 9921 }; 9922 struct rpc_task_setup task_setup_data = { 9923 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9924 .rpc_message = &msg, 9925 .callback_ops = &nfs4_layoutreturn_call_ops, 9926 .callback_data = lrp, 9927 .flags = RPC_TASK_MOVEABLE, 9928 }; 9929 int status = 0; 9930 9931 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9932 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9933 &task_setup_data.rpc_client, &msg); 9934 9935 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9936 if (!sync) { 9937 if (!lrp->inode) { 9938 nfs4_layoutreturn_release(lrp); 9939 return -EAGAIN; 9940 } 9941 task_setup_data.flags |= RPC_TASK_ASYNC; 9942 } 9943 if (!lrp->inode) 9944 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9945 1); 9946 else 9947 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9948 0); 9949 task = rpc_run_task(&task_setup_data); 9950 if (IS_ERR(task)) 9951 return PTR_ERR(task); 9952 if (sync) 9953 status = task->tk_status; 9954 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9955 dprintk("<-- %s status=%d\n", __func__, status); 9956 rpc_put_task(task); 9957 return status; 9958 } 9959 9960 static int 9961 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9962 struct pnfs_device *pdev, 9963 const struct cred *cred) 9964 { 9965 struct nfs4_getdeviceinfo_args args = { 9966 .pdev = pdev, 9967 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9968 NOTIFY_DEVICEID4_DELETE, 9969 }; 9970 struct nfs4_getdeviceinfo_res res = { 9971 .pdev = pdev, 9972 }; 9973 struct rpc_message msg = { 9974 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9975 .rpc_argp = &args, 9976 .rpc_resp = &res, 9977 .rpc_cred = cred, 9978 }; 9979 int status; 9980 9981 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9982 if (res.notification & ~args.notify_types) 9983 dprintk("%s: unsupported notification\n", __func__); 9984 if (res.notification != args.notify_types) 9985 pdev->nocache = 1; 9986 9987 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9988 9989 dprintk("<-- %s status=%d\n", __func__, status); 9990 9991 return status; 9992 } 9993 9994 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9995 struct pnfs_device *pdev, 9996 const struct cred *cred) 9997 { 9998 struct nfs4_exception exception = { }; 9999 int err; 10000 10001 do { 10002 err = nfs4_handle_exception(server, 10003 _nfs4_proc_getdeviceinfo(server, pdev, cred), 10004 &exception); 10005 } while (exception.retry); 10006 return err; 10007 } 10008 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 10009 10010 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 10011 { 10012 struct nfs4_layoutcommit_data *data = calldata; 10013 struct nfs_server *server = NFS_SERVER(data->args.inode); 10014 10015 nfs4_setup_sequence(server->nfs_client, 10016 &data->args.seq_args, 10017 &data->res.seq_res, 10018 task); 10019 } 10020 10021 static void 10022 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 10023 { 10024 struct nfs4_layoutcommit_data *data = calldata; 10025 struct nfs_server *server = NFS_SERVER(data->args.inode); 10026 10027 if (!nfs41_sequence_done(task, &data->res.seq_res)) 10028 return; 10029 10030 switch (task->tk_status) { /* Just ignore these failures */ 10031 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 10032 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 10033 case -NFS4ERR_BADLAYOUT: /* no layout */ 10034 case -NFS4ERR_GRACE: /* loca_recalim always false */ 10035 task->tk_status = 0; 10036 break; 10037 case 0: 10038 break; 10039 default: 10040 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 10041 rpc_restart_call_prepare(task); 10042 return; 10043 } 10044 } 10045 } 10046 10047 static void nfs4_layoutcommit_release(void *calldata) 10048 { 10049 struct nfs4_layoutcommit_data *data = calldata; 10050 10051 pnfs_cleanup_layoutcommit(data); 10052 nfs_post_op_update_inode_force_wcc(data->args.inode, 10053 data->res.fattr); 10054 put_cred(data->cred); 10055 nfs_iput_and_deactive(data->inode); 10056 kfree(data); 10057 } 10058 10059 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10060 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10061 .rpc_call_done = nfs4_layoutcommit_done, 10062 .rpc_release = nfs4_layoutcommit_release, 10063 }; 10064 10065 int 10066 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10067 { 10068 struct rpc_message msg = { 10069 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10070 .rpc_argp = &data->args, 10071 .rpc_resp = &data->res, 10072 .rpc_cred = data->cred, 10073 }; 10074 struct rpc_task_setup task_setup_data = { 10075 .task = &data->task, 10076 .rpc_client = NFS_CLIENT(data->args.inode), 10077 .rpc_message = &msg, 10078 .callback_ops = &nfs4_layoutcommit_ops, 10079 .callback_data = data, 10080 .flags = RPC_TASK_MOVEABLE, 10081 }; 10082 struct rpc_task *task; 10083 int status = 0; 10084 10085 dprintk("NFS: initiating layoutcommit call. sync %d " 10086 "lbw: %llu inode %lu\n", sync, 10087 data->args.lastbytewritten, 10088 data->args.inode->i_ino); 10089 10090 if (!sync) { 10091 data->inode = nfs_igrab_and_active(data->args.inode); 10092 if (data->inode == NULL) { 10093 nfs4_layoutcommit_release(data); 10094 return -EAGAIN; 10095 } 10096 task_setup_data.flags = RPC_TASK_ASYNC; 10097 } 10098 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10099 task = rpc_run_task(&task_setup_data); 10100 if (IS_ERR(task)) 10101 return PTR_ERR(task); 10102 if (sync) 10103 status = task->tk_status; 10104 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10105 dprintk("%s: status %d\n", __func__, status); 10106 rpc_put_task(task); 10107 return status; 10108 } 10109 10110 /* 10111 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10112 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10113 */ 10114 static int 10115 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10116 struct nfs_fsinfo *info, 10117 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10118 { 10119 struct nfs41_secinfo_no_name_args args = { 10120 .style = SECINFO_STYLE_CURRENT_FH, 10121 }; 10122 struct nfs4_secinfo_res res = { 10123 .flavors = flavors, 10124 }; 10125 struct rpc_message msg = { 10126 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10127 .rpc_argp = &args, 10128 .rpc_resp = &res, 10129 }; 10130 struct nfs4_call_sync_data data = { 10131 .seq_server = server, 10132 .seq_args = &args.seq_args, 10133 .seq_res = &res.seq_res, 10134 }; 10135 struct rpc_task_setup task_setup = { 10136 .rpc_client = server->client, 10137 .rpc_message = &msg, 10138 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10139 .callback_data = &data, 10140 .flags = RPC_TASK_NO_ROUND_ROBIN, 10141 }; 10142 const struct cred *cred = NULL; 10143 int status; 10144 10145 if (use_integrity) { 10146 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10147 10148 cred = nfs4_get_clid_cred(server->nfs_client); 10149 msg.rpc_cred = cred; 10150 } 10151 10152 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10153 status = nfs4_call_sync_custom(&task_setup); 10154 dprintk("<-- %s status=%d\n", __func__, status); 10155 10156 put_cred(cred); 10157 10158 return status; 10159 } 10160 10161 static int 10162 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10163 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10164 { 10165 struct nfs4_exception exception = { 10166 .interruptible = true, 10167 }; 10168 int err; 10169 do { 10170 /* first try using integrity protection */ 10171 err = -NFS4ERR_WRONGSEC; 10172 10173 /* try to use integrity protection with machine cred */ 10174 if (_nfs4_is_integrity_protected(server->nfs_client)) 10175 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10176 flavors, true); 10177 10178 /* 10179 * if unable to use integrity protection, or SECINFO with 10180 * integrity protection returns NFS4ERR_WRONGSEC (which is 10181 * disallowed by spec, but exists in deployed servers) use 10182 * the current filesystem's rpc_client and the user cred. 10183 */ 10184 if (err == -NFS4ERR_WRONGSEC) 10185 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10186 flavors, false); 10187 10188 switch (err) { 10189 case 0: 10190 case -NFS4ERR_WRONGSEC: 10191 case -ENOTSUPP: 10192 goto out; 10193 default: 10194 err = nfs4_handle_exception(server, err, &exception); 10195 } 10196 } while (exception.retry); 10197 out: 10198 return err; 10199 } 10200 10201 static int 10202 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10203 struct nfs_fsinfo *info) 10204 { 10205 int err; 10206 struct page *page; 10207 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10208 struct nfs4_secinfo_flavors *flavors; 10209 struct nfs4_secinfo4 *secinfo; 10210 int i; 10211 10212 page = alloc_page(GFP_KERNEL); 10213 if (!page) { 10214 err = -ENOMEM; 10215 goto out; 10216 } 10217 10218 flavors = page_address(page); 10219 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10220 10221 /* 10222 * Fall back on "guess and check" method if 10223 * the server doesn't support SECINFO_NO_NAME 10224 */ 10225 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10226 err = nfs4_find_root_sec(server, fhandle, info); 10227 goto out_freepage; 10228 } 10229 if (err) 10230 goto out_freepage; 10231 10232 for (i = 0; i < flavors->num_flavors; i++) { 10233 secinfo = &flavors->flavors[i]; 10234 10235 switch (secinfo->flavor) { 10236 case RPC_AUTH_NULL: 10237 case RPC_AUTH_UNIX: 10238 case RPC_AUTH_GSS: 10239 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10240 &secinfo->flavor_info); 10241 break; 10242 default: 10243 flavor = RPC_AUTH_MAXFLAVOR; 10244 break; 10245 } 10246 10247 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10248 flavor = RPC_AUTH_MAXFLAVOR; 10249 10250 if (flavor != RPC_AUTH_MAXFLAVOR) { 10251 err = nfs4_lookup_root_sec(server, fhandle, 10252 info, flavor); 10253 if (!err) 10254 break; 10255 } 10256 } 10257 10258 if (flavor == RPC_AUTH_MAXFLAVOR) 10259 err = -EPERM; 10260 10261 out_freepage: 10262 put_page(page); 10263 if (err == -EACCES) 10264 return -EPERM; 10265 out: 10266 return err; 10267 } 10268 10269 static int _nfs41_test_stateid(struct nfs_server *server, 10270 nfs4_stateid *stateid, 10271 const struct cred *cred) 10272 { 10273 int status; 10274 struct nfs41_test_stateid_args args = { 10275 .stateid = stateid, 10276 }; 10277 struct nfs41_test_stateid_res res; 10278 struct rpc_message msg = { 10279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10280 .rpc_argp = &args, 10281 .rpc_resp = &res, 10282 .rpc_cred = cred, 10283 }; 10284 struct rpc_clnt *rpc_client = server->client; 10285 10286 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10287 &rpc_client, &msg); 10288 10289 dprintk("NFS call test_stateid %p\n", stateid); 10290 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10291 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10292 &args.seq_args, &res.seq_res); 10293 if (status != NFS_OK) { 10294 dprintk("NFS reply test_stateid: failed, %d\n", status); 10295 return status; 10296 } 10297 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10298 return -res.status; 10299 } 10300 10301 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10302 int err, struct nfs4_exception *exception) 10303 { 10304 exception->retry = 0; 10305 switch(err) { 10306 case -NFS4ERR_DELAY: 10307 case -NFS4ERR_RETRY_UNCACHED_REP: 10308 nfs4_handle_exception(server, err, exception); 10309 break; 10310 case -NFS4ERR_BADSESSION: 10311 case -NFS4ERR_BADSLOT: 10312 case -NFS4ERR_BAD_HIGH_SLOT: 10313 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10314 case -NFS4ERR_DEADSESSION: 10315 nfs4_do_handle_exception(server, err, exception); 10316 } 10317 } 10318 10319 /** 10320 * nfs41_test_stateid - perform a TEST_STATEID operation 10321 * 10322 * @server: server / transport on which to perform the operation 10323 * @stateid: state ID to test 10324 * @cred: credential 10325 * 10326 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10327 * Otherwise a negative NFS4ERR value is returned if the operation 10328 * failed or the state ID is not currently valid. 10329 */ 10330 static int nfs41_test_stateid(struct nfs_server *server, 10331 nfs4_stateid *stateid, 10332 const struct cred *cred) 10333 { 10334 struct nfs4_exception exception = { 10335 .interruptible = true, 10336 }; 10337 int err; 10338 do { 10339 err = _nfs41_test_stateid(server, stateid, cred); 10340 nfs4_handle_delay_or_session_error(server, err, &exception); 10341 } while (exception.retry); 10342 return err; 10343 } 10344 10345 struct nfs_free_stateid_data { 10346 struct nfs_server *server; 10347 struct nfs41_free_stateid_args args; 10348 struct nfs41_free_stateid_res res; 10349 }; 10350 10351 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10352 { 10353 struct nfs_free_stateid_data *data = calldata; 10354 nfs4_setup_sequence(data->server->nfs_client, 10355 &data->args.seq_args, 10356 &data->res.seq_res, 10357 task); 10358 } 10359 10360 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10361 { 10362 struct nfs_free_stateid_data *data = calldata; 10363 10364 nfs41_sequence_done(task, &data->res.seq_res); 10365 10366 switch (task->tk_status) { 10367 case -NFS4ERR_DELAY: 10368 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10369 rpc_restart_call_prepare(task); 10370 } 10371 } 10372 10373 static void nfs41_free_stateid_release(void *calldata) 10374 { 10375 struct nfs_free_stateid_data *data = calldata; 10376 struct nfs_client *clp = data->server->nfs_client; 10377 10378 nfs_put_client(clp); 10379 kfree(calldata); 10380 } 10381 10382 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10383 .rpc_call_prepare = nfs41_free_stateid_prepare, 10384 .rpc_call_done = nfs41_free_stateid_done, 10385 .rpc_release = nfs41_free_stateid_release, 10386 }; 10387 10388 /** 10389 * nfs41_free_stateid - perform a FREE_STATEID operation 10390 * 10391 * @server: server / transport on which to perform the operation 10392 * @stateid: state ID to release 10393 * @cred: credential 10394 * @privileged: set to true if this call needs to be privileged 10395 * 10396 * Note: this function is always asynchronous. 10397 */ 10398 static int nfs41_free_stateid(struct nfs_server *server, 10399 const nfs4_stateid *stateid, 10400 const struct cred *cred, 10401 bool privileged) 10402 { 10403 struct rpc_message msg = { 10404 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10405 .rpc_cred = cred, 10406 }; 10407 struct rpc_task_setup task_setup = { 10408 .rpc_client = server->client, 10409 .rpc_message = &msg, 10410 .callback_ops = &nfs41_free_stateid_ops, 10411 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10412 }; 10413 struct nfs_free_stateid_data *data; 10414 struct rpc_task *task; 10415 struct nfs_client *clp = server->nfs_client; 10416 10417 if (!refcount_inc_not_zero(&clp->cl_count)) 10418 return -EIO; 10419 10420 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10421 &task_setup.rpc_client, &msg); 10422 10423 dprintk("NFS call free_stateid %p\n", stateid); 10424 data = kmalloc(sizeof(*data), GFP_KERNEL); 10425 if (!data) 10426 return -ENOMEM; 10427 data->server = server; 10428 nfs4_stateid_copy(&data->args.stateid, stateid); 10429 10430 task_setup.callback_data = data; 10431 10432 msg.rpc_argp = &data->args; 10433 msg.rpc_resp = &data->res; 10434 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10435 task = rpc_run_task(&task_setup); 10436 if (IS_ERR(task)) 10437 return PTR_ERR(task); 10438 rpc_put_task(task); 10439 return 0; 10440 } 10441 10442 static void 10443 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10444 { 10445 const struct cred *cred = lsp->ls_state->owner->so_cred; 10446 10447 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10448 nfs4_free_lock_state(server, lsp); 10449 } 10450 10451 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10452 const nfs4_stateid *s2) 10453 { 10454 if (s1->type != s2->type) 10455 return false; 10456 10457 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10458 return false; 10459 10460 if (s1->seqid == s2->seqid) 10461 return true; 10462 10463 return s1->seqid == 0 || s2->seqid == 0; 10464 } 10465 10466 #endif /* CONFIG_NFS_V4_1 */ 10467 10468 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10469 const nfs4_stateid *s2) 10470 { 10471 return nfs4_stateid_match(s1, s2); 10472 } 10473 10474 10475 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10476 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10477 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10478 .recover_open = nfs4_open_reclaim, 10479 .recover_lock = nfs4_lock_reclaim, 10480 .establish_clid = nfs4_init_clientid, 10481 .detect_trunking = nfs40_discover_server_trunking, 10482 }; 10483 10484 #if defined(CONFIG_NFS_V4_1) 10485 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10486 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10487 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10488 .recover_open = nfs4_open_reclaim, 10489 .recover_lock = nfs4_lock_reclaim, 10490 .establish_clid = nfs41_init_clientid, 10491 .reclaim_complete = nfs41_proc_reclaim_complete, 10492 .detect_trunking = nfs41_discover_server_trunking, 10493 }; 10494 #endif /* CONFIG_NFS_V4_1 */ 10495 10496 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10497 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10498 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10499 .recover_open = nfs40_open_expired, 10500 .recover_lock = nfs4_lock_expired, 10501 .establish_clid = nfs4_init_clientid, 10502 }; 10503 10504 #if defined(CONFIG_NFS_V4_1) 10505 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10506 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10507 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10508 .recover_open = nfs41_open_expired, 10509 .recover_lock = nfs41_lock_expired, 10510 .establish_clid = nfs41_init_clientid, 10511 }; 10512 #endif /* CONFIG_NFS_V4_1 */ 10513 10514 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10515 .sched_state_renewal = nfs4_proc_async_renew, 10516 .get_state_renewal_cred = nfs4_get_renew_cred, 10517 .renew_lease = nfs4_proc_renew, 10518 }; 10519 10520 #if defined(CONFIG_NFS_V4_1) 10521 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10522 .sched_state_renewal = nfs41_proc_async_sequence, 10523 .get_state_renewal_cred = nfs4_get_machine_cred, 10524 .renew_lease = nfs4_proc_sequence, 10525 }; 10526 #endif 10527 10528 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10529 .get_locations = _nfs40_proc_get_locations, 10530 .fsid_present = _nfs40_proc_fsid_present, 10531 }; 10532 10533 #if defined(CONFIG_NFS_V4_1) 10534 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10535 .get_locations = _nfs41_proc_get_locations, 10536 .fsid_present = _nfs41_proc_fsid_present, 10537 }; 10538 #endif /* CONFIG_NFS_V4_1 */ 10539 10540 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10541 .minor_version = 0, 10542 .init_caps = NFS_CAP_READDIRPLUS 10543 | NFS_CAP_ATOMIC_OPEN 10544 | NFS_CAP_POSIX_LOCK, 10545 .init_client = nfs40_init_client, 10546 .shutdown_client = nfs40_shutdown_client, 10547 .match_stateid = nfs4_match_stateid, 10548 .find_root_sec = nfs4_find_root_sec, 10549 .free_lock_state = nfs4_release_lockowner, 10550 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10551 .alloc_seqid = nfs_alloc_seqid, 10552 .call_sync_ops = &nfs40_call_sync_ops, 10553 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10554 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10555 .state_renewal_ops = &nfs40_state_renewal_ops, 10556 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10557 }; 10558 10559 #if defined(CONFIG_NFS_V4_1) 10560 static struct nfs_seqid * 10561 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10562 { 10563 return NULL; 10564 } 10565 10566 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10567 .minor_version = 1, 10568 .init_caps = NFS_CAP_READDIRPLUS 10569 | NFS_CAP_ATOMIC_OPEN 10570 | NFS_CAP_POSIX_LOCK 10571 | NFS_CAP_STATEID_NFSV41 10572 | NFS_CAP_ATOMIC_OPEN_V1 10573 | NFS_CAP_LGOPEN 10574 | NFS_CAP_MOVEABLE, 10575 .init_client = nfs41_init_client, 10576 .shutdown_client = nfs41_shutdown_client, 10577 .match_stateid = nfs41_match_stateid, 10578 .find_root_sec = nfs41_find_root_sec, 10579 .free_lock_state = nfs41_free_lock_state, 10580 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10581 .alloc_seqid = nfs_alloc_no_seqid, 10582 .session_trunk = nfs4_test_session_trunk, 10583 .call_sync_ops = &nfs41_call_sync_ops, 10584 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10585 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10586 .state_renewal_ops = &nfs41_state_renewal_ops, 10587 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10588 }; 10589 #endif 10590 10591 #if defined(CONFIG_NFS_V4_2) 10592 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10593 .minor_version = 2, 10594 .init_caps = NFS_CAP_READDIRPLUS 10595 | NFS_CAP_ATOMIC_OPEN 10596 | NFS_CAP_POSIX_LOCK 10597 | NFS_CAP_STATEID_NFSV41 10598 | NFS_CAP_ATOMIC_OPEN_V1 10599 | NFS_CAP_LGOPEN 10600 | NFS_CAP_ALLOCATE 10601 | NFS_CAP_COPY 10602 | NFS_CAP_OFFLOAD_CANCEL 10603 | NFS_CAP_COPY_NOTIFY 10604 | NFS_CAP_DEALLOCATE 10605 | NFS_CAP_SEEK 10606 | NFS_CAP_LAYOUTSTATS 10607 | NFS_CAP_CLONE 10608 | NFS_CAP_LAYOUTERROR 10609 | NFS_CAP_READ_PLUS 10610 | NFS_CAP_MOVEABLE, 10611 .init_client = nfs41_init_client, 10612 .shutdown_client = nfs41_shutdown_client, 10613 .match_stateid = nfs41_match_stateid, 10614 .find_root_sec = nfs41_find_root_sec, 10615 .free_lock_state = nfs41_free_lock_state, 10616 .call_sync_ops = &nfs41_call_sync_ops, 10617 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10618 .alloc_seqid = nfs_alloc_no_seqid, 10619 .session_trunk = nfs4_test_session_trunk, 10620 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10621 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10622 .state_renewal_ops = &nfs41_state_renewal_ops, 10623 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10624 }; 10625 #endif 10626 10627 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10628 [0] = &nfs_v4_0_minor_ops, 10629 #if defined(CONFIG_NFS_V4_1) 10630 [1] = &nfs_v4_1_minor_ops, 10631 #endif 10632 #if defined(CONFIG_NFS_V4_2) 10633 [2] = &nfs_v4_2_minor_ops, 10634 #endif 10635 }; 10636 10637 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10638 { 10639 ssize_t error, error2, error3; 10640 size_t left = size; 10641 10642 error = generic_listxattr(dentry, list, left); 10643 if (error < 0) 10644 return error; 10645 if (list) { 10646 list += error; 10647 left -= error; 10648 } 10649 10650 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left); 10651 if (error2 < 0) 10652 return error2; 10653 10654 if (list) { 10655 list += error2; 10656 left -= error2; 10657 } 10658 10659 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left); 10660 if (error3 < 0) 10661 return error3; 10662 10663 error += error2 + error3; 10664 if (size && error > size) 10665 return -ERANGE; 10666 return error; 10667 } 10668 10669 static void nfs4_enable_swap(struct inode *inode) 10670 { 10671 /* The state manager thread must always be running. 10672 * It will notice the client is a swapper, and stay put. 10673 */ 10674 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10675 10676 nfs4_schedule_state_manager(clp); 10677 } 10678 10679 static void nfs4_disable_swap(struct inode *inode) 10680 { 10681 /* The state manager thread will now exit once it is 10682 * woken. 10683 */ 10684 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10685 10686 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10687 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10688 wake_up_var(&clp->cl_state); 10689 } 10690 10691 static const struct inode_operations nfs4_dir_inode_operations = { 10692 .create = nfs_create, 10693 .lookup = nfs_lookup, 10694 .atomic_open = nfs_atomic_open, 10695 .link = nfs_link, 10696 .unlink = nfs_unlink, 10697 .symlink = nfs_symlink, 10698 .mkdir = nfs_mkdir, 10699 .rmdir = nfs_rmdir, 10700 .mknod = nfs_mknod, 10701 .rename = nfs_rename, 10702 .permission = nfs_permission, 10703 .getattr = nfs_getattr, 10704 .setattr = nfs_setattr, 10705 .listxattr = nfs4_listxattr, 10706 }; 10707 10708 static const struct inode_operations nfs4_file_inode_operations = { 10709 .permission = nfs_permission, 10710 .getattr = nfs_getattr, 10711 .setattr = nfs_setattr, 10712 .listxattr = nfs4_listxattr, 10713 }; 10714 10715 const struct nfs_rpc_ops nfs_v4_clientops = { 10716 .version = 4, /* protocol version */ 10717 .dentry_ops = &nfs4_dentry_operations, 10718 .dir_inode_ops = &nfs4_dir_inode_operations, 10719 .file_inode_ops = &nfs4_file_inode_operations, 10720 .file_ops = &nfs4_file_operations, 10721 .getroot = nfs4_proc_get_root, 10722 .submount = nfs4_submount, 10723 .try_get_tree = nfs4_try_get_tree, 10724 .getattr = nfs4_proc_getattr, 10725 .setattr = nfs4_proc_setattr, 10726 .lookup = nfs4_proc_lookup, 10727 .lookupp = nfs4_proc_lookupp, 10728 .access = nfs4_proc_access, 10729 .readlink = nfs4_proc_readlink, 10730 .create = nfs4_proc_create, 10731 .remove = nfs4_proc_remove, 10732 .unlink_setup = nfs4_proc_unlink_setup, 10733 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10734 .unlink_done = nfs4_proc_unlink_done, 10735 .rename_setup = nfs4_proc_rename_setup, 10736 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10737 .rename_done = nfs4_proc_rename_done, 10738 .link = nfs4_proc_link, 10739 .symlink = nfs4_proc_symlink, 10740 .mkdir = nfs4_proc_mkdir, 10741 .rmdir = nfs4_proc_rmdir, 10742 .readdir = nfs4_proc_readdir, 10743 .mknod = nfs4_proc_mknod, 10744 .statfs = nfs4_proc_statfs, 10745 .fsinfo = nfs4_proc_fsinfo, 10746 .pathconf = nfs4_proc_pathconf, 10747 .set_capabilities = nfs4_server_capabilities, 10748 .decode_dirent = nfs4_decode_dirent, 10749 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10750 .read_setup = nfs4_proc_read_setup, 10751 .read_done = nfs4_read_done, 10752 .write_setup = nfs4_proc_write_setup, 10753 .write_done = nfs4_write_done, 10754 .commit_setup = nfs4_proc_commit_setup, 10755 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10756 .commit_done = nfs4_commit_done, 10757 .lock = nfs4_proc_lock, 10758 .clear_acl_cache = nfs4_zap_acl_attr, 10759 .close_context = nfs4_close_context, 10760 .open_context = nfs4_atomic_open, 10761 .have_delegation = nfs4_have_delegation, 10762 .alloc_client = nfs4_alloc_client, 10763 .init_client = nfs4_init_client, 10764 .free_client = nfs4_free_client, 10765 .create_server = nfs4_create_server, 10766 .clone_server = nfs_clone_server, 10767 .discover_trunking = nfs4_discover_trunking, 10768 .enable_swap = nfs4_enable_swap, 10769 .disable_swap = nfs4_disable_swap, 10770 }; 10771 10772 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10773 .name = XATTR_NAME_NFSV4_ACL, 10774 .list = nfs4_xattr_list_nfs4_acl, 10775 .get = nfs4_xattr_get_nfs4_acl, 10776 .set = nfs4_xattr_set_nfs4_acl, 10777 }; 10778 10779 #if defined(CONFIG_NFS_V4_1) 10780 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10781 .name = XATTR_NAME_NFSV4_DACL, 10782 .list = nfs4_xattr_list_nfs4_dacl, 10783 .get = nfs4_xattr_get_nfs4_dacl, 10784 .set = nfs4_xattr_set_nfs4_dacl, 10785 }; 10786 10787 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10788 .name = XATTR_NAME_NFSV4_SACL, 10789 .list = nfs4_xattr_list_nfs4_sacl, 10790 .get = nfs4_xattr_get_nfs4_sacl, 10791 .set = nfs4_xattr_set_nfs4_sacl, 10792 }; 10793 #endif 10794 10795 #ifdef CONFIG_NFS_V4_2 10796 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10797 .prefix = XATTR_USER_PREFIX, 10798 .get = nfs4_xattr_get_nfs4_user, 10799 .set = nfs4_xattr_set_nfs4_user, 10800 }; 10801 #endif 10802 10803 const struct xattr_handler * const nfs4_xattr_handlers[] = { 10804 &nfs4_xattr_nfs4_acl_handler, 10805 #if defined(CONFIG_NFS_V4_1) 10806 &nfs4_xattr_nfs4_dacl_handler, 10807 &nfs4_xattr_nfs4_sacl_handler, 10808 #endif 10809 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10810 &nfs4_xattr_nfs4_label_handler, 10811 #endif 10812 #ifdef CONFIG_NFS_V4_2 10813 &nfs4_xattr_nfs4_user_handler, 10814 #endif 10815 NULL 10816 }; 10817