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 unsigned int seq; 3073 int ret; 3074 3075 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3076 dir_verifier = nfs_save_change_attribute(dir); 3077 3078 ret = _nfs4_proc_open(opendata, ctx); 3079 if (ret != 0) 3080 goto out; 3081 3082 state = _nfs4_opendata_to_nfs4_state(opendata); 3083 ret = PTR_ERR(state); 3084 if (IS_ERR(state)) 3085 goto out; 3086 ctx->state = state; 3087 if (server->caps & NFS_CAP_POSIX_LOCK) 3088 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3089 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3090 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3091 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3092 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3093 3094 dentry = opendata->dentry; 3095 if (d_really_is_negative(dentry)) { 3096 struct dentry *alias; 3097 d_drop(dentry); 3098 alias = d_exact_alias(dentry, state->inode); 3099 if (!alias) 3100 alias = d_splice_alias(igrab(state->inode), dentry); 3101 /* d_splice_alias() can't fail here - it's a non-directory */ 3102 if (alias) { 3103 dput(ctx->dentry); 3104 ctx->dentry = dentry = alias; 3105 } 3106 } 3107 3108 switch(opendata->o_arg.claim) { 3109 default: 3110 break; 3111 case NFS4_OPEN_CLAIM_NULL: 3112 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3113 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3114 if (!opendata->rpc_done) 3115 break; 3116 if (opendata->o_res.delegation_type != 0) 3117 dir_verifier = nfs_save_change_attribute(dir); 3118 nfs_set_verifier(dentry, dir_verifier); 3119 } 3120 3121 /* Parse layoutget results before we check for access */ 3122 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3123 3124 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3125 if (ret != 0) 3126 goto out; 3127 3128 if (d_inode(dentry) == state->inode) { 3129 nfs_inode_attach_open_context(ctx); 3130 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3131 nfs4_schedule_stateid_recovery(server, state); 3132 } 3133 3134 out: 3135 if (!opendata->cancelled) { 3136 if (opendata->lgp) { 3137 nfs4_lgopen_release(opendata->lgp); 3138 opendata->lgp = NULL; 3139 } 3140 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3141 } 3142 return ret; 3143 } 3144 3145 /* 3146 * Returns a referenced nfs4_state 3147 */ 3148 static int _nfs4_do_open(struct inode *dir, 3149 struct nfs_open_context *ctx, 3150 int flags, 3151 const struct nfs4_open_createattrs *c, 3152 int *opened) 3153 { 3154 struct nfs4_state_owner *sp; 3155 struct nfs4_state *state = NULL; 3156 struct nfs_server *server = NFS_SERVER(dir); 3157 struct nfs4_opendata *opendata; 3158 struct dentry *dentry = ctx->dentry; 3159 const struct cred *cred = ctx->cred; 3160 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3161 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3162 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3163 struct iattr *sattr = c->sattr; 3164 struct nfs4_label *label = c->label; 3165 int status; 3166 3167 /* Protect against reboot recovery conflicts */ 3168 status = -ENOMEM; 3169 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3170 if (sp == NULL) { 3171 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3172 goto out_err; 3173 } 3174 status = nfs4_client_recover_expired_lease(server->nfs_client); 3175 if (status != 0) 3176 goto err_put_state_owner; 3177 if (d_really_is_positive(dentry)) 3178 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3179 status = -ENOMEM; 3180 if (d_really_is_positive(dentry)) 3181 claim = NFS4_OPEN_CLAIM_FH; 3182 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3183 c, claim, GFP_KERNEL); 3184 if (opendata == NULL) 3185 goto err_put_state_owner; 3186 3187 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3188 if (!opendata->f_attr.mdsthreshold) { 3189 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3190 if (!opendata->f_attr.mdsthreshold) 3191 goto err_opendata_put; 3192 } 3193 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3194 } 3195 if (d_really_is_positive(dentry)) 3196 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3197 3198 status = _nfs4_open_and_get_state(opendata, ctx); 3199 if (status != 0) 3200 goto err_opendata_put; 3201 state = ctx->state; 3202 3203 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3204 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3205 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3206 /* 3207 * send create attributes which was not set by open 3208 * with an extra setattr. 3209 */ 3210 if (attrs || label) { 3211 unsigned ia_old = sattr->ia_valid; 3212 3213 sattr->ia_valid = attrs; 3214 nfs_fattr_init(opendata->o_res.f_attr); 3215 status = nfs4_do_setattr(state->inode, cred, 3216 opendata->o_res.f_attr, sattr, 3217 ctx, label); 3218 if (status == 0) { 3219 nfs_setattr_update_inode(state->inode, sattr, 3220 opendata->o_res.f_attr); 3221 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3222 } 3223 sattr->ia_valid = ia_old; 3224 } 3225 } 3226 if (opened && opendata->file_created) 3227 *opened = 1; 3228 3229 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3230 *ctx_th = opendata->f_attr.mdsthreshold; 3231 opendata->f_attr.mdsthreshold = NULL; 3232 } 3233 3234 nfs4_opendata_put(opendata); 3235 nfs4_put_state_owner(sp); 3236 return 0; 3237 err_opendata_put: 3238 nfs4_opendata_put(opendata); 3239 err_put_state_owner: 3240 nfs4_put_state_owner(sp); 3241 out_err: 3242 return status; 3243 } 3244 3245 3246 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3247 struct nfs_open_context *ctx, 3248 int flags, 3249 struct iattr *sattr, 3250 struct nfs4_label *label, 3251 int *opened) 3252 { 3253 struct nfs_server *server = NFS_SERVER(dir); 3254 struct nfs4_exception exception = { 3255 .interruptible = true, 3256 }; 3257 struct nfs4_state *res; 3258 struct nfs4_open_createattrs c = { 3259 .label = label, 3260 .sattr = sattr, 3261 .verf = { 3262 [0] = (__u32)jiffies, 3263 [1] = (__u32)current->pid, 3264 }, 3265 }; 3266 int status; 3267 3268 do { 3269 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3270 res = ctx->state; 3271 trace_nfs4_open_file(ctx, flags, status); 3272 if (status == 0) 3273 break; 3274 /* NOTE: BAD_SEQID means the server and client disagree about the 3275 * book-keeping w.r.t. state-changing operations 3276 * (OPEN/CLOSE/LOCK/LOCKU...) 3277 * It is actually a sign of a bug on the client or on the server. 3278 * 3279 * If we receive a BAD_SEQID error in the particular case of 3280 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3281 * have unhashed the old state_owner for us, and that we can 3282 * therefore safely retry using a new one. We should still warn 3283 * the user though... 3284 */ 3285 if (status == -NFS4ERR_BAD_SEQID) { 3286 pr_warn_ratelimited("NFS: v4 server %s " 3287 " returned a bad sequence-id error!\n", 3288 NFS_SERVER(dir)->nfs_client->cl_hostname); 3289 exception.retry = 1; 3290 continue; 3291 } 3292 /* 3293 * BAD_STATEID on OPEN means that the server cancelled our 3294 * state before it received the OPEN_CONFIRM. 3295 * Recover by retrying the request as per the discussion 3296 * on Page 181 of RFC3530. 3297 */ 3298 if (status == -NFS4ERR_BAD_STATEID) { 3299 exception.retry = 1; 3300 continue; 3301 } 3302 if (status == -NFS4ERR_EXPIRED) { 3303 nfs4_schedule_lease_recovery(server->nfs_client); 3304 exception.retry = 1; 3305 continue; 3306 } 3307 if (status == -EAGAIN) { 3308 /* We must have found a delegation */ 3309 exception.retry = 1; 3310 continue; 3311 } 3312 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3313 continue; 3314 res = ERR_PTR(nfs4_handle_exception(server, 3315 status, &exception)); 3316 } while (exception.retry); 3317 return res; 3318 } 3319 3320 static int _nfs4_do_setattr(struct inode *inode, 3321 struct nfs_setattrargs *arg, 3322 struct nfs_setattrres *res, 3323 const struct cred *cred, 3324 struct nfs_open_context *ctx) 3325 { 3326 struct nfs_server *server = NFS_SERVER(inode); 3327 struct rpc_message msg = { 3328 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3329 .rpc_argp = arg, 3330 .rpc_resp = res, 3331 .rpc_cred = cred, 3332 }; 3333 const struct cred *delegation_cred = NULL; 3334 unsigned long timestamp = jiffies; 3335 bool truncate; 3336 int status; 3337 3338 nfs_fattr_init(res->fattr); 3339 3340 /* Servers should only apply open mode checks for file size changes */ 3341 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3342 if (!truncate) { 3343 nfs4_inode_make_writeable(inode); 3344 goto zero_stateid; 3345 } 3346 3347 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3348 /* Use that stateid */ 3349 } else if (ctx != NULL && ctx->state) { 3350 struct nfs_lock_context *l_ctx; 3351 if (!nfs4_valid_open_stateid(ctx->state)) 3352 return -EBADF; 3353 l_ctx = nfs_get_lock_context(ctx); 3354 if (IS_ERR(l_ctx)) 3355 return PTR_ERR(l_ctx); 3356 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3357 &arg->stateid, &delegation_cred); 3358 nfs_put_lock_context(l_ctx); 3359 if (status == -EIO) 3360 return -EBADF; 3361 else if (status == -EAGAIN) 3362 goto zero_stateid; 3363 } else { 3364 zero_stateid: 3365 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3366 } 3367 if (delegation_cred) 3368 msg.rpc_cred = delegation_cred; 3369 3370 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3371 3372 put_cred(delegation_cred); 3373 if (status == 0 && ctx != NULL) 3374 renew_lease(server, timestamp); 3375 trace_nfs4_setattr(inode, &arg->stateid, status); 3376 return status; 3377 } 3378 3379 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3380 struct nfs_fattr *fattr, struct iattr *sattr, 3381 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3382 { 3383 struct nfs_server *server = NFS_SERVER(inode); 3384 __u32 bitmask[NFS4_BITMASK_SZ]; 3385 struct nfs4_state *state = ctx ? ctx->state : NULL; 3386 struct nfs_setattrargs arg = { 3387 .fh = NFS_FH(inode), 3388 .iap = sattr, 3389 .server = server, 3390 .bitmask = bitmask, 3391 .label = ilabel, 3392 }; 3393 struct nfs_setattrres res = { 3394 .fattr = fattr, 3395 .server = server, 3396 }; 3397 struct nfs4_exception exception = { 3398 .state = state, 3399 .inode = inode, 3400 .stateid = &arg.stateid, 3401 }; 3402 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3403 int err; 3404 3405 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3406 adjust_flags |= NFS_INO_INVALID_MODE; 3407 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3408 adjust_flags |= NFS_INO_INVALID_OTHER; 3409 3410 do { 3411 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3412 inode, adjust_flags); 3413 3414 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3415 switch (err) { 3416 case -NFS4ERR_OPENMODE: 3417 if (!(sattr->ia_valid & ATTR_SIZE)) { 3418 pr_warn_once("NFSv4: server %s is incorrectly " 3419 "applying open mode checks to " 3420 "a SETATTR that is not " 3421 "changing file size.\n", 3422 server->nfs_client->cl_hostname); 3423 } 3424 if (state && !(state->state & FMODE_WRITE)) { 3425 err = -EBADF; 3426 if (sattr->ia_valid & ATTR_OPEN) 3427 err = -EACCES; 3428 goto out; 3429 } 3430 } 3431 err = nfs4_handle_exception(server, err, &exception); 3432 } while (exception.retry); 3433 out: 3434 return err; 3435 } 3436 3437 static bool 3438 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3439 { 3440 if (inode == NULL || !nfs_have_layout(inode)) 3441 return false; 3442 3443 return pnfs_wait_on_layoutreturn(inode, task); 3444 } 3445 3446 /* 3447 * Update the seqid of an open stateid 3448 */ 3449 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3450 struct nfs4_state *state) 3451 { 3452 __be32 seqid_open; 3453 u32 dst_seqid; 3454 int seq; 3455 3456 for (;;) { 3457 if (!nfs4_valid_open_stateid(state)) 3458 break; 3459 seq = read_seqbegin(&state->seqlock); 3460 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3461 nfs4_stateid_copy(dst, &state->open_stateid); 3462 if (read_seqretry(&state->seqlock, seq)) 3463 continue; 3464 break; 3465 } 3466 seqid_open = state->open_stateid.seqid; 3467 if (read_seqretry(&state->seqlock, seq)) 3468 continue; 3469 3470 dst_seqid = be32_to_cpu(dst->seqid); 3471 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3472 dst->seqid = seqid_open; 3473 break; 3474 } 3475 } 3476 3477 /* 3478 * Update the seqid of an open stateid after receiving 3479 * NFS4ERR_OLD_STATEID 3480 */ 3481 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3482 struct nfs4_state *state) 3483 { 3484 __be32 seqid_open; 3485 u32 dst_seqid; 3486 bool ret; 3487 int seq, status = -EAGAIN; 3488 DEFINE_WAIT(wait); 3489 3490 for (;;) { 3491 ret = false; 3492 if (!nfs4_valid_open_stateid(state)) 3493 break; 3494 seq = read_seqbegin(&state->seqlock); 3495 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3496 if (read_seqretry(&state->seqlock, seq)) 3497 continue; 3498 break; 3499 } 3500 3501 write_seqlock(&state->seqlock); 3502 seqid_open = state->open_stateid.seqid; 3503 3504 dst_seqid = be32_to_cpu(dst->seqid); 3505 3506 /* Did another OPEN bump the state's seqid? try again: */ 3507 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3508 dst->seqid = seqid_open; 3509 write_sequnlock(&state->seqlock); 3510 ret = true; 3511 break; 3512 } 3513 3514 /* server says we're behind but we haven't seen the update yet */ 3515 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3516 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3517 write_sequnlock(&state->seqlock); 3518 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3519 3520 if (fatal_signal_pending(current)) 3521 status = -EINTR; 3522 else 3523 if (schedule_timeout(5*HZ) != 0) 3524 status = 0; 3525 3526 finish_wait(&state->waitq, &wait); 3527 3528 if (!status) 3529 continue; 3530 if (status == -EINTR) 3531 break; 3532 3533 /* we slept the whole 5 seconds, we must have lost a seqid */ 3534 dst->seqid = cpu_to_be32(dst_seqid + 1); 3535 ret = true; 3536 break; 3537 } 3538 3539 return ret; 3540 } 3541 3542 struct nfs4_closedata { 3543 struct inode *inode; 3544 struct nfs4_state *state; 3545 struct nfs_closeargs arg; 3546 struct nfs_closeres res; 3547 struct { 3548 struct nfs4_layoutreturn_args arg; 3549 struct nfs4_layoutreturn_res res; 3550 struct nfs4_xdr_opaque_data ld_private; 3551 u32 roc_barrier; 3552 bool roc; 3553 } lr; 3554 struct nfs_fattr fattr; 3555 unsigned long timestamp; 3556 }; 3557 3558 static void nfs4_free_closedata(void *data) 3559 { 3560 struct nfs4_closedata *calldata = data; 3561 struct nfs4_state_owner *sp = calldata->state->owner; 3562 struct super_block *sb = calldata->state->inode->i_sb; 3563 3564 if (calldata->lr.roc) 3565 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3566 calldata->res.lr_ret); 3567 nfs4_put_open_state(calldata->state); 3568 nfs_free_seqid(calldata->arg.seqid); 3569 nfs4_put_state_owner(sp); 3570 nfs_sb_deactive(sb); 3571 kfree(calldata); 3572 } 3573 3574 static void nfs4_close_done(struct rpc_task *task, void *data) 3575 { 3576 struct nfs4_closedata *calldata = data; 3577 struct nfs4_state *state = calldata->state; 3578 struct nfs_server *server = NFS_SERVER(calldata->inode); 3579 nfs4_stateid *res_stateid = NULL; 3580 struct nfs4_exception exception = { 3581 .state = state, 3582 .inode = calldata->inode, 3583 .stateid = &calldata->arg.stateid, 3584 }; 3585 3586 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3587 return; 3588 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3589 3590 /* Handle Layoutreturn errors */ 3591 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3592 &calldata->res.lr_ret) == -EAGAIN) 3593 goto out_restart; 3594 3595 /* hmm. we are done with the inode, and in the process of freeing 3596 * the state_owner. we keep this around to process errors 3597 */ 3598 switch (task->tk_status) { 3599 case 0: 3600 res_stateid = &calldata->res.stateid; 3601 renew_lease(server, calldata->timestamp); 3602 break; 3603 case -NFS4ERR_ACCESS: 3604 if (calldata->arg.bitmask != NULL) { 3605 calldata->arg.bitmask = NULL; 3606 calldata->res.fattr = NULL; 3607 goto out_restart; 3608 3609 } 3610 break; 3611 case -NFS4ERR_OLD_STATEID: 3612 /* Did we race with OPEN? */ 3613 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3614 state)) 3615 goto out_restart; 3616 goto out_release; 3617 case -NFS4ERR_ADMIN_REVOKED: 3618 case -NFS4ERR_STALE_STATEID: 3619 case -NFS4ERR_EXPIRED: 3620 nfs4_free_revoked_stateid(server, 3621 &calldata->arg.stateid, 3622 task->tk_msg.rpc_cred); 3623 fallthrough; 3624 case -NFS4ERR_BAD_STATEID: 3625 if (calldata->arg.fmode == 0) 3626 break; 3627 fallthrough; 3628 default: 3629 task->tk_status = nfs4_async_handle_exception(task, 3630 server, task->tk_status, &exception); 3631 if (exception.retry) 3632 goto out_restart; 3633 } 3634 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3635 res_stateid, calldata->arg.fmode); 3636 out_release: 3637 task->tk_status = 0; 3638 nfs_release_seqid(calldata->arg.seqid); 3639 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3640 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3641 return; 3642 out_restart: 3643 task->tk_status = 0; 3644 rpc_restart_call_prepare(task); 3645 goto out_release; 3646 } 3647 3648 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3649 { 3650 struct nfs4_closedata *calldata = data; 3651 struct nfs4_state *state = calldata->state; 3652 struct inode *inode = calldata->inode; 3653 struct nfs_server *server = NFS_SERVER(inode); 3654 struct pnfs_layout_hdr *lo; 3655 bool is_rdonly, is_wronly, is_rdwr; 3656 int call_close = 0; 3657 3658 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3659 goto out_wait; 3660 3661 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3662 spin_lock(&state->owner->so_lock); 3663 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3664 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3665 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3666 /* Calculate the change in open mode */ 3667 calldata->arg.fmode = 0; 3668 if (state->n_rdwr == 0) { 3669 if (state->n_rdonly == 0) 3670 call_close |= is_rdonly; 3671 else if (is_rdonly) 3672 calldata->arg.fmode |= FMODE_READ; 3673 if (state->n_wronly == 0) 3674 call_close |= is_wronly; 3675 else if (is_wronly) 3676 calldata->arg.fmode |= FMODE_WRITE; 3677 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3678 call_close |= is_rdwr; 3679 } else if (is_rdwr) 3680 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3681 3682 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3683 if (!nfs4_valid_open_stateid(state)) 3684 call_close = 0; 3685 spin_unlock(&state->owner->so_lock); 3686 3687 if (!call_close) { 3688 /* Note: exit _without_ calling nfs4_close_done */ 3689 goto out_no_action; 3690 } 3691 3692 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3693 nfs_release_seqid(calldata->arg.seqid); 3694 goto out_wait; 3695 } 3696 3697 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3698 if (lo && !pnfs_layout_is_valid(lo)) { 3699 calldata->arg.lr_args = NULL; 3700 calldata->res.lr_res = NULL; 3701 } 3702 3703 if (calldata->arg.fmode == 0) 3704 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3705 3706 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3707 /* Close-to-open cache consistency revalidation */ 3708 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3709 nfs4_bitmask_set(calldata->arg.bitmask_store, 3710 server->cache_consistency_bitmask, 3711 inode, 0); 3712 calldata->arg.bitmask = calldata->arg.bitmask_store; 3713 } else 3714 calldata->arg.bitmask = NULL; 3715 } 3716 3717 calldata->arg.share_access = 3718 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3719 calldata->arg.fmode, 0); 3720 3721 if (calldata->res.fattr == NULL) 3722 calldata->arg.bitmask = NULL; 3723 else if (calldata->arg.bitmask == NULL) 3724 calldata->res.fattr = NULL; 3725 calldata->timestamp = jiffies; 3726 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3727 &calldata->arg.seq_args, 3728 &calldata->res.seq_res, 3729 task) != 0) 3730 nfs_release_seqid(calldata->arg.seqid); 3731 return; 3732 out_no_action: 3733 task->tk_action = NULL; 3734 out_wait: 3735 nfs4_sequence_done(task, &calldata->res.seq_res); 3736 } 3737 3738 static const struct rpc_call_ops nfs4_close_ops = { 3739 .rpc_call_prepare = nfs4_close_prepare, 3740 .rpc_call_done = nfs4_close_done, 3741 .rpc_release = nfs4_free_closedata, 3742 }; 3743 3744 /* 3745 * It is possible for data to be read/written from a mem-mapped file 3746 * after the sys_close call (which hits the vfs layer as a flush). 3747 * This means that we can't safely call nfsv4 close on a file until 3748 * the inode is cleared. This in turn means that we are not good 3749 * NFSv4 citizens - we do not indicate to the server to update the file's 3750 * share state even when we are done with one of the three share 3751 * stateid's in the inode. 3752 * 3753 * NOTE: Caller must be holding the sp->so_owner semaphore! 3754 */ 3755 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3756 { 3757 struct nfs_server *server = NFS_SERVER(state->inode); 3758 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3759 struct nfs4_closedata *calldata; 3760 struct nfs4_state_owner *sp = state->owner; 3761 struct rpc_task *task; 3762 struct rpc_message msg = { 3763 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3764 .rpc_cred = state->owner->so_cred, 3765 }; 3766 struct rpc_task_setup task_setup_data = { 3767 .rpc_client = server->client, 3768 .rpc_message = &msg, 3769 .callback_ops = &nfs4_close_ops, 3770 .workqueue = nfsiod_workqueue, 3771 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3772 }; 3773 int status = -ENOMEM; 3774 3775 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3776 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3777 3778 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3779 &task_setup_data.rpc_client, &msg); 3780 3781 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3782 if (calldata == NULL) 3783 goto out; 3784 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3785 calldata->inode = state->inode; 3786 calldata->state = state; 3787 calldata->arg.fh = NFS_FH(state->inode); 3788 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3789 goto out_free_calldata; 3790 /* Serialization for the sequence id */ 3791 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3792 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3793 if (IS_ERR(calldata->arg.seqid)) 3794 goto out_free_calldata; 3795 nfs_fattr_init(&calldata->fattr); 3796 calldata->arg.fmode = 0; 3797 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3798 calldata->res.fattr = &calldata->fattr; 3799 calldata->res.seqid = calldata->arg.seqid; 3800 calldata->res.server = server; 3801 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3802 calldata->lr.roc = pnfs_roc(state->inode, 3803 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3804 if (calldata->lr.roc) { 3805 calldata->arg.lr_args = &calldata->lr.arg; 3806 calldata->res.lr_res = &calldata->lr.res; 3807 } 3808 nfs_sb_active(calldata->inode->i_sb); 3809 3810 msg.rpc_argp = &calldata->arg; 3811 msg.rpc_resp = &calldata->res; 3812 task_setup_data.callback_data = calldata; 3813 task = rpc_run_task(&task_setup_data); 3814 if (IS_ERR(task)) 3815 return PTR_ERR(task); 3816 status = 0; 3817 if (wait) 3818 status = rpc_wait_for_completion_task(task); 3819 rpc_put_task(task); 3820 return status; 3821 out_free_calldata: 3822 kfree(calldata); 3823 out: 3824 nfs4_put_open_state(state); 3825 nfs4_put_state_owner(sp); 3826 return status; 3827 } 3828 3829 static struct inode * 3830 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3831 int open_flags, struct iattr *attr, int *opened) 3832 { 3833 struct nfs4_state *state; 3834 struct nfs4_label l, *label; 3835 3836 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3837 3838 /* Protect against concurrent sillydeletes */ 3839 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3840 3841 nfs4_label_release_security(label); 3842 3843 if (IS_ERR(state)) 3844 return ERR_CAST(state); 3845 return state->inode; 3846 } 3847 3848 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3849 { 3850 if (ctx->state == NULL) 3851 return; 3852 if (is_sync) 3853 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3854 else 3855 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3856 } 3857 3858 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3859 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3860 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3861 3862 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3863 { 3864 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3865 struct nfs4_server_caps_arg args = { 3866 .fhandle = fhandle, 3867 .bitmask = bitmask, 3868 }; 3869 struct nfs4_server_caps_res res = {}; 3870 struct rpc_message msg = { 3871 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3872 .rpc_argp = &args, 3873 .rpc_resp = &res, 3874 }; 3875 int status; 3876 int i; 3877 3878 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3879 FATTR4_WORD0_FH_EXPIRE_TYPE | 3880 FATTR4_WORD0_LINK_SUPPORT | 3881 FATTR4_WORD0_SYMLINK_SUPPORT | 3882 FATTR4_WORD0_ACLSUPPORT | 3883 FATTR4_WORD0_CASE_INSENSITIVE | 3884 FATTR4_WORD0_CASE_PRESERVING; 3885 if (minorversion) 3886 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3887 3888 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3889 if (status == 0) { 3890 /* Sanity check the server answers */ 3891 switch (minorversion) { 3892 case 0: 3893 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3894 res.attr_bitmask[2] = 0; 3895 break; 3896 case 1: 3897 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3898 break; 3899 case 2: 3900 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3901 } 3902 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3903 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3904 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3905 server->fattr_valid = NFS_ATTR_FATTR_V4; 3906 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3907 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3908 server->caps |= NFS_CAP_ACLS; 3909 if (res.has_links != 0) 3910 server->caps |= NFS_CAP_HARDLINKS; 3911 if (res.has_symlinks != 0) 3912 server->caps |= NFS_CAP_SYMLINKS; 3913 if (res.case_insensitive) 3914 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3915 if (res.case_preserving) 3916 server->caps |= NFS_CAP_CASE_PRESERVING; 3917 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3918 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3919 server->caps |= NFS_CAP_SECURITY_LABEL; 3920 #endif 3921 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3922 server->caps |= NFS_CAP_FS_LOCATIONS; 3923 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3924 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3925 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3926 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3927 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3928 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3929 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3930 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3931 NFS_ATTR_FATTR_OWNER_NAME); 3932 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3933 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3934 NFS_ATTR_FATTR_GROUP_NAME); 3935 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3936 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3937 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3938 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3939 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3940 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3941 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3942 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3943 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3944 sizeof(server->attr_bitmask)); 3945 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3946 3947 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3948 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3949 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3950 server->cache_consistency_bitmask[2] = 0; 3951 3952 /* Avoid a regression due to buggy server */ 3953 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3954 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3955 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3956 sizeof(server->exclcreat_bitmask)); 3957 3958 server->acl_bitmask = res.acl_bitmask; 3959 server->fh_expire_type = res.fh_expire_type; 3960 } 3961 3962 return status; 3963 } 3964 3965 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3966 { 3967 struct nfs4_exception exception = { 3968 .interruptible = true, 3969 }; 3970 int err; 3971 3972 nfs4_server_set_init_caps(server); 3973 do { 3974 err = nfs4_handle_exception(server, 3975 _nfs4_server_capabilities(server, fhandle), 3976 &exception); 3977 } while (exception.retry); 3978 return err; 3979 } 3980 3981 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3982 struct nfs_client *clp, 3983 struct nfs_server *server) 3984 { 3985 int i; 3986 3987 for (i = 0; i < location->nservers; i++) { 3988 struct nfs4_string *srv_loc = &location->servers[i]; 3989 struct sockaddr_storage addr; 3990 size_t addrlen; 3991 struct xprt_create xprt_args = { 3992 .ident = 0, 3993 .net = clp->cl_net, 3994 }; 3995 struct nfs4_add_xprt_data xprtdata = { 3996 .clp = clp, 3997 }; 3998 struct rpc_add_xprt_test rpcdata = { 3999 .add_xprt_test = clp->cl_mvops->session_trunk, 4000 .data = &xprtdata, 4001 }; 4002 char *servername = NULL; 4003 4004 if (!srv_loc->len) 4005 continue; 4006 4007 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 4008 &addr, sizeof(addr), 4009 clp->cl_net, server->port); 4010 if (!addrlen) 4011 return; 4012 xprt_args.dstaddr = (struct sockaddr *)&addr; 4013 xprt_args.addrlen = addrlen; 4014 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 4015 if (!servername) 4016 return; 4017 memcpy(servername, srv_loc->data, srv_loc->len); 4018 servername[srv_loc->len] = '\0'; 4019 xprt_args.servername = servername; 4020 4021 xprtdata.cred = nfs4_get_clid_cred(clp); 4022 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 4023 rpc_clnt_setup_test_and_add_xprt, 4024 &rpcdata); 4025 if (xprtdata.cred) 4026 put_cred(xprtdata.cred); 4027 kfree(servername); 4028 } 4029 } 4030 4031 static int _nfs4_discover_trunking(struct nfs_server *server, 4032 struct nfs_fh *fhandle) 4033 { 4034 struct nfs4_fs_locations *locations = NULL; 4035 struct page *page; 4036 const struct cred *cred; 4037 struct nfs_client *clp = server->nfs_client; 4038 const struct nfs4_state_maintenance_ops *ops = 4039 clp->cl_mvops->state_renewal_ops; 4040 int status = -ENOMEM, i; 4041 4042 cred = ops->get_state_renewal_cred(clp); 4043 if (cred == NULL) { 4044 cred = nfs4_get_clid_cred(clp); 4045 if (cred == NULL) 4046 return -ENOKEY; 4047 } 4048 4049 page = alloc_page(GFP_KERNEL); 4050 if (!page) 4051 goto out_put_cred; 4052 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4053 if (!locations) 4054 goto out_free; 4055 locations->fattr = nfs_alloc_fattr(); 4056 if (!locations->fattr) 4057 goto out_free_2; 4058 4059 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4060 cred); 4061 if (status) 4062 goto out_free_3; 4063 4064 for (i = 0; i < locations->nlocations; i++) 4065 test_fs_location_for_trunking(&locations->locations[i], clp, 4066 server); 4067 out_free_3: 4068 kfree(locations->fattr); 4069 out_free_2: 4070 kfree(locations); 4071 out_free: 4072 __free_page(page); 4073 out_put_cred: 4074 put_cred(cred); 4075 return status; 4076 } 4077 4078 static int nfs4_discover_trunking(struct nfs_server *server, 4079 struct nfs_fh *fhandle) 4080 { 4081 struct nfs4_exception exception = { 4082 .interruptible = true, 4083 }; 4084 struct nfs_client *clp = server->nfs_client; 4085 int err = 0; 4086 4087 if (!nfs4_has_session(clp)) 4088 goto out; 4089 do { 4090 err = nfs4_handle_exception(server, 4091 _nfs4_discover_trunking(server, fhandle), 4092 &exception); 4093 } while (exception.retry); 4094 out: 4095 return err; 4096 } 4097 4098 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4099 struct nfs_fsinfo *info) 4100 { 4101 u32 bitmask[3]; 4102 struct nfs4_lookup_root_arg args = { 4103 .bitmask = bitmask, 4104 }; 4105 struct nfs4_lookup_res res = { 4106 .server = server, 4107 .fattr = info->fattr, 4108 .fh = fhandle, 4109 }; 4110 struct rpc_message msg = { 4111 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4112 .rpc_argp = &args, 4113 .rpc_resp = &res, 4114 }; 4115 4116 bitmask[0] = nfs4_fattr_bitmap[0]; 4117 bitmask[1] = nfs4_fattr_bitmap[1]; 4118 /* 4119 * Process the label in the upcoming getfattr 4120 */ 4121 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4122 4123 nfs_fattr_init(info->fattr); 4124 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4125 } 4126 4127 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4128 struct nfs_fsinfo *info) 4129 { 4130 struct nfs4_exception exception = { 4131 .interruptible = true, 4132 }; 4133 int err; 4134 do { 4135 err = _nfs4_lookup_root(server, fhandle, info); 4136 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4137 switch (err) { 4138 case 0: 4139 case -NFS4ERR_WRONGSEC: 4140 goto out; 4141 default: 4142 err = nfs4_handle_exception(server, err, &exception); 4143 } 4144 } while (exception.retry); 4145 out: 4146 return err; 4147 } 4148 4149 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4150 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4151 { 4152 struct rpc_auth_create_args auth_args = { 4153 .pseudoflavor = flavor, 4154 }; 4155 struct rpc_auth *auth; 4156 4157 auth = rpcauth_create(&auth_args, server->client); 4158 if (IS_ERR(auth)) 4159 return -EACCES; 4160 return nfs4_lookup_root(server, fhandle, info); 4161 } 4162 4163 /* 4164 * Retry pseudoroot lookup with various security flavors. We do this when: 4165 * 4166 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4167 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4168 * 4169 * Returns zero on success, or a negative NFS4ERR value, or a 4170 * negative errno value. 4171 */ 4172 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4173 struct nfs_fsinfo *info) 4174 { 4175 /* Per 3530bis 15.33.5 */ 4176 static const rpc_authflavor_t flav_array[] = { 4177 RPC_AUTH_GSS_KRB5P, 4178 RPC_AUTH_GSS_KRB5I, 4179 RPC_AUTH_GSS_KRB5, 4180 RPC_AUTH_UNIX, /* courtesy */ 4181 RPC_AUTH_NULL, 4182 }; 4183 int status = -EPERM; 4184 size_t i; 4185 4186 if (server->auth_info.flavor_len > 0) { 4187 /* try each flavor specified by user */ 4188 for (i = 0; i < server->auth_info.flavor_len; i++) { 4189 status = nfs4_lookup_root_sec(server, fhandle, info, 4190 server->auth_info.flavors[i]); 4191 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4192 continue; 4193 break; 4194 } 4195 } else { 4196 /* no flavors specified by user, try default list */ 4197 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4198 status = nfs4_lookup_root_sec(server, fhandle, info, 4199 flav_array[i]); 4200 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4201 continue; 4202 break; 4203 } 4204 } 4205 4206 /* 4207 * -EACCES could mean that the user doesn't have correct permissions 4208 * to access the mount. It could also mean that we tried to mount 4209 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4210 * existing mount programs don't handle -EACCES very well so it should 4211 * be mapped to -EPERM instead. 4212 */ 4213 if (status == -EACCES) 4214 status = -EPERM; 4215 return status; 4216 } 4217 4218 /** 4219 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4220 * @server: initialized nfs_server handle 4221 * @fhandle: we fill in the pseudo-fs root file handle 4222 * @info: we fill in an FSINFO struct 4223 * @auth_probe: probe the auth flavours 4224 * 4225 * Returns zero on success, or a negative errno. 4226 */ 4227 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4228 struct nfs_fsinfo *info, 4229 bool auth_probe) 4230 { 4231 int status = 0; 4232 4233 if (!auth_probe) 4234 status = nfs4_lookup_root(server, fhandle, info); 4235 4236 if (auth_probe || status == NFS4ERR_WRONGSEC) 4237 status = server->nfs_client->cl_mvops->find_root_sec(server, 4238 fhandle, info); 4239 4240 if (status == 0) 4241 status = nfs4_server_capabilities(server, fhandle); 4242 if (status == 0) 4243 status = nfs4_do_fsinfo(server, fhandle, info); 4244 4245 return nfs4_map_errors(status); 4246 } 4247 4248 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4249 struct nfs_fsinfo *info) 4250 { 4251 int error; 4252 struct nfs_fattr *fattr = info->fattr; 4253 4254 error = nfs4_server_capabilities(server, mntfh); 4255 if (error < 0) { 4256 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4257 return error; 4258 } 4259 4260 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4261 if (error < 0) { 4262 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4263 goto out; 4264 } 4265 4266 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4267 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4268 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4269 4270 out: 4271 return error; 4272 } 4273 4274 /* 4275 * Get locations and (maybe) other attributes of a referral. 4276 * Note that we'll actually follow the referral later when 4277 * we detect fsid mismatch in inode revalidation 4278 */ 4279 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4280 const struct qstr *name, struct nfs_fattr *fattr, 4281 struct nfs_fh *fhandle) 4282 { 4283 int status = -ENOMEM; 4284 struct page *page = NULL; 4285 struct nfs4_fs_locations *locations = NULL; 4286 4287 page = alloc_page(GFP_KERNEL); 4288 if (page == NULL) 4289 goto out; 4290 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4291 if (locations == NULL) 4292 goto out; 4293 4294 locations->fattr = fattr; 4295 4296 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4297 if (status != 0) 4298 goto out; 4299 4300 /* 4301 * If the fsid didn't change, this is a migration event, not a 4302 * referral. Cause us to drop into the exception handler, which 4303 * will kick off migration recovery. 4304 */ 4305 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4306 dprintk("%s: server did not return a different fsid for" 4307 " a referral at %s\n", __func__, name->name); 4308 status = -NFS4ERR_MOVED; 4309 goto out; 4310 } 4311 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4312 nfs_fixup_referral_attributes(fattr); 4313 memset(fhandle, 0, sizeof(struct nfs_fh)); 4314 out: 4315 if (page) 4316 __free_page(page); 4317 kfree(locations); 4318 return status; 4319 } 4320 4321 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4322 struct nfs_fattr *fattr, struct inode *inode) 4323 { 4324 __u32 bitmask[NFS4_BITMASK_SZ]; 4325 struct nfs4_getattr_arg args = { 4326 .fh = fhandle, 4327 .bitmask = bitmask, 4328 }; 4329 struct nfs4_getattr_res res = { 4330 .fattr = fattr, 4331 .server = server, 4332 }; 4333 struct rpc_message msg = { 4334 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4335 .rpc_argp = &args, 4336 .rpc_resp = &res, 4337 }; 4338 unsigned short task_flags = 0; 4339 4340 if (nfs4_has_session(server->nfs_client)) 4341 task_flags = RPC_TASK_MOVEABLE; 4342 4343 /* Is this is an attribute revalidation, subject to softreval? */ 4344 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4345 task_flags |= RPC_TASK_TIMEOUT; 4346 4347 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4348 nfs_fattr_init(fattr); 4349 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4350 return nfs4_do_call_sync(server->client, server, &msg, 4351 &args.seq_args, &res.seq_res, task_flags); 4352 } 4353 4354 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4355 struct nfs_fattr *fattr, struct inode *inode) 4356 { 4357 struct nfs4_exception exception = { 4358 .interruptible = true, 4359 }; 4360 int err; 4361 do { 4362 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4363 trace_nfs4_getattr(server, fhandle, fattr, err); 4364 err = nfs4_handle_exception(server, err, 4365 &exception); 4366 } while (exception.retry); 4367 return err; 4368 } 4369 4370 /* 4371 * The file is not closed if it is opened due to the a request to change 4372 * the size of the file. The open call will not be needed once the 4373 * VFS layer lookup-intents are implemented. 4374 * 4375 * Close is called when the inode is destroyed. 4376 * If we haven't opened the file for O_WRONLY, we 4377 * need to in the size_change case to obtain a stateid. 4378 * 4379 * Got race? 4380 * Because OPEN is always done by name in nfsv4, it is 4381 * possible that we opened a different file by the same 4382 * name. We can recognize this race condition, but we 4383 * can't do anything about it besides returning an error. 4384 * 4385 * This will be fixed with VFS changes (lookup-intent). 4386 */ 4387 static int 4388 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4389 struct iattr *sattr) 4390 { 4391 struct inode *inode = d_inode(dentry); 4392 const struct cred *cred = NULL; 4393 struct nfs_open_context *ctx = NULL; 4394 int status; 4395 4396 if (pnfs_ld_layoutret_on_setattr(inode) && 4397 sattr->ia_valid & ATTR_SIZE && 4398 sattr->ia_size < i_size_read(inode)) 4399 pnfs_commit_and_return_layout(inode); 4400 4401 nfs_fattr_init(fattr); 4402 4403 /* Deal with open(O_TRUNC) */ 4404 if (sattr->ia_valid & ATTR_OPEN) 4405 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4406 4407 /* Optimization: if the end result is no change, don't RPC */ 4408 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4409 return 0; 4410 4411 /* Search for an existing open(O_WRITE) file */ 4412 if (sattr->ia_valid & ATTR_FILE) { 4413 4414 ctx = nfs_file_open_context(sattr->ia_file); 4415 if (ctx) 4416 cred = ctx->cred; 4417 } 4418 4419 /* Return any delegations if we're going to change ACLs */ 4420 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4421 nfs4_inode_make_writeable(inode); 4422 4423 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4424 if (status == 0) { 4425 nfs_setattr_update_inode(inode, sattr, fattr); 4426 nfs_setsecurity(inode, fattr); 4427 } 4428 return status; 4429 } 4430 4431 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4432 struct dentry *dentry, struct nfs_fh *fhandle, 4433 struct nfs_fattr *fattr) 4434 { 4435 struct nfs_server *server = NFS_SERVER(dir); 4436 int status; 4437 struct nfs4_lookup_arg args = { 4438 .bitmask = server->attr_bitmask, 4439 .dir_fh = NFS_FH(dir), 4440 .name = &dentry->d_name, 4441 }; 4442 struct nfs4_lookup_res res = { 4443 .server = server, 4444 .fattr = fattr, 4445 .fh = fhandle, 4446 }; 4447 struct rpc_message msg = { 4448 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4449 .rpc_argp = &args, 4450 .rpc_resp = &res, 4451 }; 4452 unsigned short task_flags = 0; 4453 4454 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4455 task_flags = RPC_TASK_MOVEABLE; 4456 4457 /* Is this is an attribute revalidation, subject to softreval? */ 4458 if (nfs_lookup_is_soft_revalidate(dentry)) 4459 task_flags |= RPC_TASK_TIMEOUT; 4460 4461 args.bitmask = nfs4_bitmask(server, fattr->label); 4462 4463 nfs_fattr_init(fattr); 4464 4465 dprintk("NFS call lookup %pd2\n", dentry); 4466 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4467 status = nfs4_do_call_sync(clnt, server, &msg, 4468 &args.seq_args, &res.seq_res, task_flags); 4469 dprintk("NFS reply lookup: %d\n", status); 4470 return status; 4471 } 4472 4473 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4474 { 4475 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4476 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4477 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4478 fattr->nlink = 2; 4479 } 4480 4481 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4482 struct dentry *dentry, struct nfs_fh *fhandle, 4483 struct nfs_fattr *fattr) 4484 { 4485 struct nfs4_exception exception = { 4486 .interruptible = true, 4487 }; 4488 struct rpc_clnt *client = *clnt; 4489 const struct qstr *name = &dentry->d_name; 4490 int err; 4491 do { 4492 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4493 trace_nfs4_lookup(dir, name, err); 4494 switch (err) { 4495 case -NFS4ERR_BADNAME: 4496 err = -ENOENT; 4497 goto out; 4498 case -NFS4ERR_MOVED: 4499 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4500 if (err == -NFS4ERR_MOVED) 4501 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4502 goto out; 4503 case -NFS4ERR_WRONGSEC: 4504 err = -EPERM; 4505 if (client != *clnt) 4506 goto out; 4507 client = nfs4_negotiate_security(client, dir, name); 4508 if (IS_ERR(client)) 4509 return PTR_ERR(client); 4510 4511 exception.retry = 1; 4512 break; 4513 default: 4514 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4515 } 4516 } while (exception.retry); 4517 4518 out: 4519 if (err == 0) 4520 *clnt = client; 4521 else if (client != *clnt) 4522 rpc_shutdown_client(client); 4523 4524 return err; 4525 } 4526 4527 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4528 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4529 { 4530 int status; 4531 struct rpc_clnt *client = NFS_CLIENT(dir); 4532 4533 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4534 if (client != NFS_CLIENT(dir)) { 4535 rpc_shutdown_client(client); 4536 nfs_fixup_secinfo_attributes(fattr); 4537 } 4538 return status; 4539 } 4540 4541 struct rpc_clnt * 4542 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4543 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4544 { 4545 struct rpc_clnt *client = NFS_CLIENT(dir); 4546 int status; 4547 4548 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4549 if (status < 0) 4550 return ERR_PTR(status); 4551 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4552 } 4553 4554 static int _nfs4_proc_lookupp(struct inode *inode, 4555 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4556 { 4557 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4558 struct nfs_server *server = NFS_SERVER(inode); 4559 int status; 4560 struct nfs4_lookupp_arg args = { 4561 .bitmask = server->attr_bitmask, 4562 .fh = NFS_FH(inode), 4563 }; 4564 struct nfs4_lookupp_res res = { 4565 .server = server, 4566 .fattr = fattr, 4567 .fh = fhandle, 4568 }; 4569 struct rpc_message msg = { 4570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4571 .rpc_argp = &args, 4572 .rpc_resp = &res, 4573 }; 4574 unsigned short task_flags = 0; 4575 4576 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4577 task_flags |= RPC_TASK_TIMEOUT; 4578 4579 args.bitmask = nfs4_bitmask(server, fattr->label); 4580 4581 nfs_fattr_init(fattr); 4582 4583 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4584 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4585 &res.seq_res, task_flags); 4586 dprintk("NFS reply lookupp: %d\n", status); 4587 return status; 4588 } 4589 4590 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4591 struct nfs_fattr *fattr) 4592 { 4593 struct nfs4_exception exception = { 4594 .interruptible = true, 4595 }; 4596 int err; 4597 do { 4598 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4599 trace_nfs4_lookupp(inode, err); 4600 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4601 &exception); 4602 } while (exception.retry); 4603 return err; 4604 } 4605 4606 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4607 const struct cred *cred) 4608 { 4609 struct nfs_server *server = NFS_SERVER(inode); 4610 struct nfs4_accessargs args = { 4611 .fh = NFS_FH(inode), 4612 .access = entry->mask, 4613 }; 4614 struct nfs4_accessres res = { 4615 .server = server, 4616 }; 4617 struct rpc_message msg = { 4618 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4619 .rpc_argp = &args, 4620 .rpc_resp = &res, 4621 .rpc_cred = cred, 4622 }; 4623 int status = 0; 4624 4625 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4626 res.fattr = nfs_alloc_fattr(); 4627 if (res.fattr == NULL) 4628 return -ENOMEM; 4629 args.bitmask = server->cache_consistency_bitmask; 4630 } 4631 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4632 if (!status) { 4633 nfs_access_set_mask(entry, res.access); 4634 if (res.fattr) 4635 nfs_refresh_inode(inode, res.fattr); 4636 } 4637 nfs_free_fattr(res.fattr); 4638 return status; 4639 } 4640 4641 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4642 const struct cred *cred) 4643 { 4644 struct nfs4_exception exception = { 4645 .interruptible = true, 4646 }; 4647 int err; 4648 do { 4649 err = _nfs4_proc_access(inode, entry, cred); 4650 trace_nfs4_access(inode, err); 4651 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4652 &exception); 4653 } while (exception.retry); 4654 return err; 4655 } 4656 4657 /* 4658 * TODO: For the time being, we don't try to get any attributes 4659 * along with any of the zero-copy operations READ, READDIR, 4660 * READLINK, WRITE. 4661 * 4662 * In the case of the first three, we want to put the GETATTR 4663 * after the read-type operation -- this is because it is hard 4664 * to predict the length of a GETATTR response in v4, and thus 4665 * align the READ data correctly. This means that the GETATTR 4666 * may end up partially falling into the page cache, and we should 4667 * shift it into the 'tail' of the xdr_buf before processing. 4668 * To do this efficiently, we need to know the total length 4669 * of data received, which doesn't seem to be available outside 4670 * of the RPC layer. 4671 * 4672 * In the case of WRITE, we also want to put the GETATTR after 4673 * the operation -- in this case because we want to make sure 4674 * we get the post-operation mtime and size. 4675 * 4676 * Both of these changes to the XDR layer would in fact be quite 4677 * minor, but I decided to leave them for a subsequent patch. 4678 */ 4679 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4680 unsigned int pgbase, unsigned int pglen) 4681 { 4682 struct nfs4_readlink args = { 4683 .fh = NFS_FH(inode), 4684 .pgbase = pgbase, 4685 .pglen = pglen, 4686 .pages = &page, 4687 }; 4688 struct nfs4_readlink_res res; 4689 struct rpc_message msg = { 4690 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4691 .rpc_argp = &args, 4692 .rpc_resp = &res, 4693 }; 4694 4695 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4696 } 4697 4698 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4699 unsigned int pgbase, unsigned int pglen) 4700 { 4701 struct nfs4_exception exception = { 4702 .interruptible = true, 4703 }; 4704 int err; 4705 do { 4706 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4707 trace_nfs4_readlink(inode, err); 4708 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4709 &exception); 4710 } while (exception.retry); 4711 return err; 4712 } 4713 4714 /* 4715 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4716 */ 4717 static int 4718 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4719 int flags) 4720 { 4721 struct nfs_server *server = NFS_SERVER(dir); 4722 struct nfs4_label l, *ilabel; 4723 struct nfs_open_context *ctx; 4724 struct nfs4_state *state; 4725 int status = 0; 4726 4727 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4728 if (IS_ERR(ctx)) 4729 return PTR_ERR(ctx); 4730 4731 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4732 4733 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4734 sattr->ia_mode &= ~current_umask(); 4735 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4736 if (IS_ERR(state)) { 4737 status = PTR_ERR(state); 4738 goto out; 4739 } 4740 out: 4741 nfs4_label_release_security(ilabel); 4742 put_nfs_open_context(ctx); 4743 return status; 4744 } 4745 4746 static int 4747 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4748 { 4749 struct nfs_server *server = NFS_SERVER(dir); 4750 struct nfs_removeargs args = { 4751 .fh = NFS_FH(dir), 4752 .name = *name, 4753 }; 4754 struct nfs_removeres res = { 4755 .server = server, 4756 }; 4757 struct rpc_message msg = { 4758 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4759 .rpc_argp = &args, 4760 .rpc_resp = &res, 4761 }; 4762 unsigned long timestamp = jiffies; 4763 int status; 4764 4765 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4766 if (status == 0) { 4767 spin_lock(&dir->i_lock); 4768 /* Removing a directory decrements nlink in the parent */ 4769 if (ftype == NF4DIR && dir->i_nlink > 2) 4770 nfs4_dec_nlink_locked(dir); 4771 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4772 NFS_INO_INVALID_DATA); 4773 spin_unlock(&dir->i_lock); 4774 } 4775 return status; 4776 } 4777 4778 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4779 { 4780 struct nfs4_exception exception = { 4781 .interruptible = true, 4782 }; 4783 struct inode *inode = d_inode(dentry); 4784 int err; 4785 4786 if (inode) { 4787 if (inode->i_nlink == 1) 4788 nfs4_inode_return_delegation(inode); 4789 else 4790 nfs4_inode_make_writeable(inode); 4791 } 4792 do { 4793 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4794 trace_nfs4_remove(dir, &dentry->d_name, err); 4795 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4796 &exception); 4797 } while (exception.retry); 4798 return err; 4799 } 4800 4801 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4802 { 4803 struct nfs4_exception exception = { 4804 .interruptible = true, 4805 }; 4806 int err; 4807 4808 do { 4809 err = _nfs4_proc_remove(dir, name, NF4DIR); 4810 trace_nfs4_remove(dir, name, err); 4811 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4812 &exception); 4813 } while (exception.retry); 4814 return err; 4815 } 4816 4817 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4818 struct dentry *dentry, 4819 struct inode *inode) 4820 { 4821 struct nfs_removeargs *args = msg->rpc_argp; 4822 struct nfs_removeres *res = msg->rpc_resp; 4823 4824 res->server = NFS_SB(dentry->d_sb); 4825 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4826 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4827 4828 nfs_fattr_init(res->dir_attr); 4829 4830 if (inode) { 4831 nfs4_inode_return_delegation(inode); 4832 nfs_d_prune_case_insensitive_aliases(inode); 4833 } 4834 } 4835 4836 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4837 { 4838 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4839 &data->args.seq_args, 4840 &data->res.seq_res, 4841 task); 4842 } 4843 4844 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4845 { 4846 struct nfs_unlinkdata *data = task->tk_calldata; 4847 struct nfs_removeres *res = &data->res; 4848 4849 if (!nfs4_sequence_done(task, &res->seq_res)) 4850 return 0; 4851 if (nfs4_async_handle_error(task, res->server, NULL, 4852 &data->timeout) == -EAGAIN) 4853 return 0; 4854 if (task->tk_status == 0) 4855 nfs4_update_changeattr(dir, &res->cinfo, 4856 res->dir_attr->time_start, 4857 NFS_INO_INVALID_DATA); 4858 return 1; 4859 } 4860 4861 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4862 struct dentry *old_dentry, 4863 struct dentry *new_dentry) 4864 { 4865 struct nfs_renameargs *arg = msg->rpc_argp; 4866 struct nfs_renameres *res = msg->rpc_resp; 4867 struct inode *old_inode = d_inode(old_dentry); 4868 struct inode *new_inode = d_inode(new_dentry); 4869 4870 if (old_inode) 4871 nfs4_inode_make_writeable(old_inode); 4872 if (new_inode) 4873 nfs4_inode_return_delegation(new_inode); 4874 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4875 res->server = NFS_SB(old_dentry->d_sb); 4876 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4877 } 4878 4879 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4880 { 4881 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4882 &data->args.seq_args, 4883 &data->res.seq_res, 4884 task); 4885 } 4886 4887 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4888 struct inode *new_dir) 4889 { 4890 struct nfs_renamedata *data = task->tk_calldata; 4891 struct nfs_renameres *res = &data->res; 4892 4893 if (!nfs4_sequence_done(task, &res->seq_res)) 4894 return 0; 4895 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4896 return 0; 4897 4898 if (task->tk_status == 0) { 4899 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4900 if (new_dir != old_dir) { 4901 /* Note: If we moved a directory, nlink will change */ 4902 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4903 res->old_fattr->time_start, 4904 NFS_INO_INVALID_NLINK | 4905 NFS_INO_INVALID_DATA); 4906 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4907 res->new_fattr->time_start, 4908 NFS_INO_INVALID_NLINK | 4909 NFS_INO_INVALID_DATA); 4910 } else 4911 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4912 res->old_fattr->time_start, 4913 NFS_INO_INVALID_DATA); 4914 } 4915 return 1; 4916 } 4917 4918 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4919 { 4920 struct nfs_server *server = NFS_SERVER(inode); 4921 __u32 bitmask[NFS4_BITMASK_SZ]; 4922 struct nfs4_link_arg arg = { 4923 .fh = NFS_FH(inode), 4924 .dir_fh = NFS_FH(dir), 4925 .name = name, 4926 .bitmask = bitmask, 4927 }; 4928 struct nfs4_link_res res = { 4929 .server = server, 4930 }; 4931 struct rpc_message msg = { 4932 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4933 .rpc_argp = &arg, 4934 .rpc_resp = &res, 4935 }; 4936 int status = -ENOMEM; 4937 4938 res.fattr = nfs_alloc_fattr_with_label(server); 4939 if (res.fattr == NULL) 4940 goto out; 4941 4942 nfs4_inode_make_writeable(inode); 4943 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4944 NFS_INO_INVALID_CHANGE); 4945 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4946 if (!status) { 4947 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4948 NFS_INO_INVALID_DATA); 4949 nfs4_inc_nlink(inode); 4950 status = nfs_post_op_update_inode(inode, res.fattr); 4951 if (!status) 4952 nfs_setsecurity(inode, res.fattr); 4953 } 4954 4955 out: 4956 nfs_free_fattr(res.fattr); 4957 return status; 4958 } 4959 4960 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4961 { 4962 struct nfs4_exception exception = { 4963 .interruptible = true, 4964 }; 4965 int err; 4966 do { 4967 err = nfs4_handle_exception(NFS_SERVER(inode), 4968 _nfs4_proc_link(inode, dir, name), 4969 &exception); 4970 } while (exception.retry); 4971 return err; 4972 } 4973 4974 struct nfs4_createdata { 4975 struct rpc_message msg; 4976 struct nfs4_create_arg arg; 4977 struct nfs4_create_res res; 4978 struct nfs_fh fh; 4979 struct nfs_fattr fattr; 4980 }; 4981 4982 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4983 const struct qstr *name, struct iattr *sattr, u32 ftype) 4984 { 4985 struct nfs4_createdata *data; 4986 4987 data = kzalloc(sizeof(*data), GFP_KERNEL); 4988 if (data != NULL) { 4989 struct nfs_server *server = NFS_SERVER(dir); 4990 4991 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4992 if (IS_ERR(data->fattr.label)) 4993 goto out_free; 4994 4995 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4996 data->msg.rpc_argp = &data->arg; 4997 data->msg.rpc_resp = &data->res; 4998 data->arg.dir_fh = NFS_FH(dir); 4999 data->arg.server = server; 5000 data->arg.name = name; 5001 data->arg.attrs = sattr; 5002 data->arg.ftype = ftype; 5003 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 5004 data->arg.umask = current_umask(); 5005 data->res.server = server; 5006 data->res.fh = &data->fh; 5007 data->res.fattr = &data->fattr; 5008 nfs_fattr_init(data->res.fattr); 5009 } 5010 return data; 5011 out_free: 5012 kfree(data); 5013 return NULL; 5014 } 5015 5016 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 5017 { 5018 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 5019 &data->arg.seq_args, &data->res.seq_res, 1); 5020 if (status == 0) { 5021 spin_lock(&dir->i_lock); 5022 /* Creating a directory bumps nlink in the parent */ 5023 if (data->arg.ftype == NF4DIR) 5024 nfs4_inc_nlink_locked(dir); 5025 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 5026 data->res.fattr->time_start, 5027 NFS_INO_INVALID_DATA); 5028 spin_unlock(&dir->i_lock); 5029 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5030 } 5031 return status; 5032 } 5033 5034 static void nfs4_free_createdata(struct nfs4_createdata *data) 5035 { 5036 nfs4_label_free(data->fattr.label); 5037 kfree(data); 5038 } 5039 5040 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5041 struct folio *folio, unsigned int len, struct iattr *sattr, 5042 struct nfs4_label *label) 5043 { 5044 struct page *page = &folio->page; 5045 struct nfs4_createdata *data; 5046 int status = -ENAMETOOLONG; 5047 5048 if (len > NFS4_MAXPATHLEN) 5049 goto out; 5050 5051 status = -ENOMEM; 5052 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5053 if (data == NULL) 5054 goto out; 5055 5056 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5057 data->arg.u.symlink.pages = &page; 5058 data->arg.u.symlink.len = len; 5059 data->arg.label = label; 5060 5061 status = nfs4_do_create(dir, dentry, data); 5062 5063 nfs4_free_createdata(data); 5064 out: 5065 return status; 5066 } 5067 5068 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5069 struct folio *folio, unsigned int len, struct iattr *sattr) 5070 { 5071 struct nfs4_exception exception = { 5072 .interruptible = true, 5073 }; 5074 struct nfs4_label l, *label; 5075 int err; 5076 5077 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5078 5079 do { 5080 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label); 5081 trace_nfs4_symlink(dir, &dentry->d_name, err); 5082 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5083 &exception); 5084 } while (exception.retry); 5085 5086 nfs4_label_release_security(label); 5087 return err; 5088 } 5089 5090 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5091 struct iattr *sattr, struct nfs4_label *label) 5092 { 5093 struct nfs4_createdata *data; 5094 int status = -ENOMEM; 5095 5096 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5097 if (data == NULL) 5098 goto out; 5099 5100 data->arg.label = label; 5101 status = nfs4_do_create(dir, dentry, data); 5102 5103 nfs4_free_createdata(data); 5104 out: 5105 return status; 5106 } 5107 5108 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5109 struct iattr *sattr) 5110 { 5111 struct nfs_server *server = NFS_SERVER(dir); 5112 struct nfs4_exception exception = { 5113 .interruptible = true, 5114 }; 5115 struct nfs4_label l, *label; 5116 int err; 5117 5118 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5119 5120 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5121 sattr->ia_mode &= ~current_umask(); 5122 do { 5123 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5124 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5125 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5126 &exception); 5127 } while (exception.retry); 5128 nfs4_label_release_security(label); 5129 5130 return err; 5131 } 5132 5133 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5134 struct nfs_readdir_res *nr_res) 5135 { 5136 struct inode *dir = d_inode(nr_arg->dentry); 5137 struct nfs_server *server = NFS_SERVER(dir); 5138 struct nfs4_readdir_arg args = { 5139 .fh = NFS_FH(dir), 5140 .pages = nr_arg->pages, 5141 .pgbase = 0, 5142 .count = nr_arg->page_len, 5143 .plus = nr_arg->plus, 5144 }; 5145 struct nfs4_readdir_res res; 5146 struct rpc_message msg = { 5147 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5148 .rpc_argp = &args, 5149 .rpc_resp = &res, 5150 .rpc_cred = nr_arg->cred, 5151 }; 5152 int status; 5153 5154 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5155 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5156 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5157 args.bitmask = server->attr_bitmask_nl; 5158 else 5159 args.bitmask = server->attr_bitmask; 5160 5161 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5162 res.pgbase = args.pgbase; 5163 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5164 &res.seq_res, 0); 5165 if (status >= 0) { 5166 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5167 status += args.pgbase; 5168 } 5169 5170 nfs_invalidate_atime(dir); 5171 5172 dprintk("%s: returns %d\n", __func__, status); 5173 return status; 5174 } 5175 5176 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5177 struct nfs_readdir_res *res) 5178 { 5179 struct nfs4_exception exception = { 5180 .interruptible = true, 5181 }; 5182 int err; 5183 do { 5184 err = _nfs4_proc_readdir(arg, res); 5185 trace_nfs4_readdir(d_inode(arg->dentry), err); 5186 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5187 err, &exception); 5188 } while (exception.retry); 5189 return err; 5190 } 5191 5192 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5193 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5194 { 5195 struct nfs4_createdata *data; 5196 int mode = sattr->ia_mode; 5197 int status = -ENOMEM; 5198 5199 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5200 if (data == NULL) 5201 goto out; 5202 5203 if (S_ISFIFO(mode)) 5204 data->arg.ftype = NF4FIFO; 5205 else if (S_ISBLK(mode)) { 5206 data->arg.ftype = NF4BLK; 5207 data->arg.u.device.specdata1 = MAJOR(rdev); 5208 data->arg.u.device.specdata2 = MINOR(rdev); 5209 } 5210 else if (S_ISCHR(mode)) { 5211 data->arg.ftype = NF4CHR; 5212 data->arg.u.device.specdata1 = MAJOR(rdev); 5213 data->arg.u.device.specdata2 = MINOR(rdev); 5214 } else if (!S_ISSOCK(mode)) { 5215 status = -EINVAL; 5216 goto out_free; 5217 } 5218 5219 data->arg.label = label; 5220 status = nfs4_do_create(dir, dentry, data); 5221 out_free: 5222 nfs4_free_createdata(data); 5223 out: 5224 return status; 5225 } 5226 5227 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5228 struct iattr *sattr, dev_t rdev) 5229 { 5230 struct nfs_server *server = NFS_SERVER(dir); 5231 struct nfs4_exception exception = { 5232 .interruptible = true, 5233 }; 5234 struct nfs4_label l, *label; 5235 int err; 5236 5237 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5238 5239 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5240 sattr->ia_mode &= ~current_umask(); 5241 do { 5242 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5243 trace_nfs4_mknod(dir, &dentry->d_name, err); 5244 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5245 &exception); 5246 } while (exception.retry); 5247 5248 nfs4_label_release_security(label); 5249 5250 return err; 5251 } 5252 5253 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5254 struct nfs_fsstat *fsstat) 5255 { 5256 struct nfs4_statfs_arg args = { 5257 .fh = fhandle, 5258 .bitmask = server->attr_bitmask, 5259 }; 5260 struct nfs4_statfs_res res = { 5261 .fsstat = fsstat, 5262 }; 5263 struct rpc_message msg = { 5264 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5265 .rpc_argp = &args, 5266 .rpc_resp = &res, 5267 }; 5268 5269 nfs_fattr_init(fsstat->fattr); 5270 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5271 } 5272 5273 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5274 { 5275 struct nfs4_exception exception = { 5276 .interruptible = true, 5277 }; 5278 int err; 5279 do { 5280 err = nfs4_handle_exception(server, 5281 _nfs4_proc_statfs(server, fhandle, fsstat), 5282 &exception); 5283 } while (exception.retry); 5284 return err; 5285 } 5286 5287 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5288 struct nfs_fsinfo *fsinfo) 5289 { 5290 struct nfs4_fsinfo_arg args = { 5291 .fh = fhandle, 5292 .bitmask = server->attr_bitmask, 5293 }; 5294 struct nfs4_fsinfo_res res = { 5295 .fsinfo = fsinfo, 5296 }; 5297 struct rpc_message msg = { 5298 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5299 .rpc_argp = &args, 5300 .rpc_resp = &res, 5301 }; 5302 5303 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5304 } 5305 5306 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5307 { 5308 struct nfs4_exception exception = { 5309 .interruptible = true, 5310 }; 5311 int err; 5312 5313 do { 5314 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5315 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5316 if (err == 0) { 5317 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5318 break; 5319 } 5320 err = nfs4_handle_exception(server, err, &exception); 5321 } while (exception.retry); 5322 return err; 5323 } 5324 5325 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5326 { 5327 int error; 5328 5329 nfs_fattr_init(fsinfo->fattr); 5330 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5331 if (error == 0) { 5332 /* block layout checks this! */ 5333 server->pnfs_blksize = fsinfo->blksize; 5334 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5335 } 5336 5337 return error; 5338 } 5339 5340 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5341 struct nfs_pathconf *pathconf) 5342 { 5343 struct nfs4_pathconf_arg args = { 5344 .fh = fhandle, 5345 .bitmask = server->attr_bitmask, 5346 }; 5347 struct nfs4_pathconf_res res = { 5348 .pathconf = pathconf, 5349 }; 5350 struct rpc_message msg = { 5351 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5352 .rpc_argp = &args, 5353 .rpc_resp = &res, 5354 }; 5355 5356 /* None of the pathconf attributes are mandatory to implement */ 5357 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5358 memset(pathconf, 0, sizeof(*pathconf)); 5359 return 0; 5360 } 5361 5362 nfs_fattr_init(pathconf->fattr); 5363 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5364 } 5365 5366 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5367 struct nfs_pathconf *pathconf) 5368 { 5369 struct nfs4_exception exception = { 5370 .interruptible = true, 5371 }; 5372 int err; 5373 5374 do { 5375 err = nfs4_handle_exception(server, 5376 _nfs4_proc_pathconf(server, fhandle, pathconf), 5377 &exception); 5378 } while (exception.retry); 5379 return err; 5380 } 5381 5382 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5383 const struct nfs_open_context *ctx, 5384 const struct nfs_lock_context *l_ctx, 5385 fmode_t fmode) 5386 { 5387 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5388 } 5389 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5390 5391 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5392 const struct nfs_open_context *ctx, 5393 const struct nfs_lock_context *l_ctx, 5394 fmode_t fmode) 5395 { 5396 nfs4_stateid _current_stateid; 5397 5398 /* If the current stateid represents a lost lock, then exit */ 5399 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5400 return true; 5401 return nfs4_stateid_match(stateid, &_current_stateid); 5402 } 5403 5404 static bool nfs4_error_stateid_expired(int err) 5405 { 5406 switch (err) { 5407 case -NFS4ERR_DELEG_REVOKED: 5408 case -NFS4ERR_ADMIN_REVOKED: 5409 case -NFS4ERR_BAD_STATEID: 5410 case -NFS4ERR_STALE_STATEID: 5411 case -NFS4ERR_OLD_STATEID: 5412 case -NFS4ERR_OPENMODE: 5413 case -NFS4ERR_EXPIRED: 5414 return true; 5415 } 5416 return false; 5417 } 5418 5419 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5420 { 5421 struct nfs_server *server = NFS_SERVER(hdr->inode); 5422 5423 trace_nfs4_read(hdr, task->tk_status); 5424 if (task->tk_status < 0) { 5425 struct nfs4_exception exception = { 5426 .inode = hdr->inode, 5427 .state = hdr->args.context->state, 5428 .stateid = &hdr->args.stateid, 5429 }; 5430 task->tk_status = nfs4_async_handle_exception(task, 5431 server, task->tk_status, &exception); 5432 if (exception.retry) { 5433 rpc_restart_call_prepare(task); 5434 return -EAGAIN; 5435 } 5436 } 5437 5438 if (task->tk_status > 0) 5439 renew_lease(server, hdr->timestamp); 5440 return 0; 5441 } 5442 5443 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5444 struct nfs_pgio_args *args) 5445 { 5446 5447 if (!nfs4_error_stateid_expired(task->tk_status) || 5448 nfs4_stateid_is_current(&args->stateid, 5449 args->context, 5450 args->lock_context, 5451 FMODE_READ)) 5452 return false; 5453 rpc_restart_call_prepare(task); 5454 return true; 5455 } 5456 5457 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5458 struct nfs_pgio_header *hdr) 5459 { 5460 struct nfs_server *server = NFS_SERVER(hdr->inode); 5461 struct rpc_message *msg = &task->tk_msg; 5462 5463 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5464 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5465 server->caps &= ~NFS_CAP_READ_PLUS; 5466 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5467 rpc_restart_call_prepare(task); 5468 return true; 5469 } 5470 return false; 5471 } 5472 5473 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5474 { 5475 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5476 return -EAGAIN; 5477 if (nfs4_read_stateid_changed(task, &hdr->args)) 5478 return -EAGAIN; 5479 if (nfs4_read_plus_not_supported(task, hdr)) 5480 return -EAGAIN; 5481 if (task->tk_status > 0) 5482 nfs_invalidate_atime(hdr->inode); 5483 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5484 nfs4_read_done_cb(task, hdr); 5485 } 5486 5487 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5488 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5489 struct rpc_message *msg) 5490 { 5491 /* Note: We don't use READ_PLUS with pNFS yet */ 5492 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5493 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5494 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5495 } 5496 return false; 5497 } 5498 #else 5499 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5500 struct rpc_message *msg) 5501 { 5502 return false; 5503 } 5504 #endif /* CONFIG_NFS_V4_2 */ 5505 5506 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5507 struct rpc_message *msg) 5508 { 5509 hdr->timestamp = jiffies; 5510 if (!hdr->pgio_done_cb) 5511 hdr->pgio_done_cb = nfs4_read_done_cb; 5512 if (!nfs42_read_plus_support(hdr, msg)) 5513 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5514 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5515 } 5516 5517 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5518 struct nfs_pgio_header *hdr) 5519 { 5520 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5521 &hdr->args.seq_args, 5522 &hdr->res.seq_res, 5523 task)) 5524 return 0; 5525 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5526 hdr->args.lock_context, 5527 hdr->rw_mode) == -EIO) 5528 return -EIO; 5529 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5530 return -EIO; 5531 return 0; 5532 } 5533 5534 static int nfs4_write_done_cb(struct rpc_task *task, 5535 struct nfs_pgio_header *hdr) 5536 { 5537 struct inode *inode = hdr->inode; 5538 5539 trace_nfs4_write(hdr, task->tk_status); 5540 if (task->tk_status < 0) { 5541 struct nfs4_exception exception = { 5542 .inode = hdr->inode, 5543 .state = hdr->args.context->state, 5544 .stateid = &hdr->args.stateid, 5545 }; 5546 task->tk_status = nfs4_async_handle_exception(task, 5547 NFS_SERVER(inode), task->tk_status, 5548 &exception); 5549 if (exception.retry) { 5550 rpc_restart_call_prepare(task); 5551 return -EAGAIN; 5552 } 5553 } 5554 if (task->tk_status >= 0) { 5555 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5556 nfs_writeback_update_inode(hdr); 5557 } 5558 return 0; 5559 } 5560 5561 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5562 struct nfs_pgio_args *args) 5563 { 5564 5565 if (!nfs4_error_stateid_expired(task->tk_status) || 5566 nfs4_stateid_is_current(&args->stateid, 5567 args->context, 5568 args->lock_context, 5569 FMODE_WRITE)) 5570 return false; 5571 rpc_restart_call_prepare(task); 5572 return true; 5573 } 5574 5575 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5576 { 5577 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5578 return -EAGAIN; 5579 if (nfs4_write_stateid_changed(task, &hdr->args)) 5580 return -EAGAIN; 5581 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5582 nfs4_write_done_cb(task, hdr); 5583 } 5584 5585 static 5586 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5587 { 5588 /* Don't request attributes for pNFS or O_DIRECT writes */ 5589 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5590 return false; 5591 /* Otherwise, request attributes if and only if we don't hold 5592 * a delegation 5593 */ 5594 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5595 } 5596 5597 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5598 struct inode *inode, unsigned long cache_validity) 5599 { 5600 struct nfs_server *server = NFS_SERVER(inode); 5601 unsigned int i; 5602 5603 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5604 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5605 5606 if (cache_validity & NFS_INO_INVALID_CHANGE) 5607 bitmask[0] |= FATTR4_WORD0_CHANGE; 5608 if (cache_validity & NFS_INO_INVALID_ATIME) 5609 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5610 if (cache_validity & NFS_INO_INVALID_MODE) 5611 bitmask[1] |= FATTR4_WORD1_MODE; 5612 if (cache_validity & NFS_INO_INVALID_OTHER) 5613 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5614 if (cache_validity & NFS_INO_INVALID_NLINK) 5615 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5616 if (cache_validity & NFS_INO_INVALID_CTIME) 5617 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5618 if (cache_validity & NFS_INO_INVALID_MTIME) 5619 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5620 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5621 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5622 5623 if (cache_validity & NFS_INO_INVALID_SIZE) 5624 bitmask[0] |= FATTR4_WORD0_SIZE; 5625 5626 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5627 bitmask[i] &= server->attr_bitmask[i]; 5628 } 5629 5630 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5631 struct rpc_message *msg, 5632 struct rpc_clnt **clnt) 5633 { 5634 struct nfs_server *server = NFS_SERVER(hdr->inode); 5635 5636 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5637 hdr->args.bitmask = NULL; 5638 hdr->res.fattr = NULL; 5639 } else { 5640 nfs4_bitmask_set(hdr->args.bitmask_store, 5641 server->cache_consistency_bitmask, 5642 hdr->inode, NFS_INO_INVALID_BLOCKS); 5643 hdr->args.bitmask = hdr->args.bitmask_store; 5644 } 5645 5646 if (!hdr->pgio_done_cb) 5647 hdr->pgio_done_cb = nfs4_write_done_cb; 5648 hdr->res.server = server; 5649 hdr->timestamp = jiffies; 5650 5651 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5652 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5653 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr); 5654 } 5655 5656 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5657 { 5658 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5659 &data->args.seq_args, 5660 &data->res.seq_res, 5661 task); 5662 } 5663 5664 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5665 { 5666 struct inode *inode = data->inode; 5667 5668 trace_nfs4_commit(data, task->tk_status); 5669 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5670 NULL, NULL) == -EAGAIN) { 5671 rpc_restart_call_prepare(task); 5672 return -EAGAIN; 5673 } 5674 return 0; 5675 } 5676 5677 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5678 { 5679 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5680 return -EAGAIN; 5681 return data->commit_done_cb(task, data); 5682 } 5683 5684 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5685 struct rpc_clnt **clnt) 5686 { 5687 struct nfs_server *server = NFS_SERVER(data->inode); 5688 5689 if (data->commit_done_cb == NULL) 5690 data->commit_done_cb = nfs4_commit_done_cb; 5691 data->res.server = server; 5692 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5693 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5694 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client, 5695 NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5696 } 5697 5698 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5699 struct nfs_commitres *res) 5700 { 5701 struct inode *dst_inode = file_inode(dst); 5702 struct nfs_server *server = NFS_SERVER(dst_inode); 5703 struct rpc_message msg = { 5704 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5705 .rpc_argp = args, 5706 .rpc_resp = res, 5707 }; 5708 5709 args->fh = NFS_FH(dst_inode); 5710 return nfs4_call_sync(server->client, server, &msg, 5711 &args->seq_args, &res->seq_res, 1); 5712 } 5713 5714 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5715 { 5716 struct nfs_commitargs args = { 5717 .offset = offset, 5718 .count = count, 5719 }; 5720 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5721 struct nfs4_exception exception = { }; 5722 int status; 5723 5724 do { 5725 status = _nfs4_proc_commit(dst, &args, res); 5726 status = nfs4_handle_exception(dst_server, status, &exception); 5727 } while (exception.retry); 5728 5729 return status; 5730 } 5731 5732 struct nfs4_renewdata { 5733 struct nfs_client *client; 5734 unsigned long timestamp; 5735 }; 5736 5737 /* 5738 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5739 * standalone procedure for queueing an asynchronous RENEW. 5740 */ 5741 static void nfs4_renew_release(void *calldata) 5742 { 5743 struct nfs4_renewdata *data = calldata; 5744 struct nfs_client *clp = data->client; 5745 5746 if (refcount_read(&clp->cl_count) > 1) 5747 nfs4_schedule_state_renewal(clp); 5748 nfs_put_client(clp); 5749 kfree(data); 5750 } 5751 5752 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5753 { 5754 struct nfs4_renewdata *data = calldata; 5755 struct nfs_client *clp = data->client; 5756 unsigned long timestamp = data->timestamp; 5757 5758 trace_nfs4_renew_async(clp, task->tk_status); 5759 switch (task->tk_status) { 5760 case 0: 5761 break; 5762 case -NFS4ERR_LEASE_MOVED: 5763 nfs4_schedule_lease_moved_recovery(clp); 5764 break; 5765 default: 5766 /* Unless we're shutting down, schedule state recovery! */ 5767 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5768 return; 5769 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5770 nfs4_schedule_lease_recovery(clp); 5771 return; 5772 } 5773 nfs4_schedule_path_down_recovery(clp); 5774 } 5775 do_renew_lease(clp, timestamp); 5776 } 5777 5778 static const struct rpc_call_ops nfs4_renew_ops = { 5779 .rpc_call_done = nfs4_renew_done, 5780 .rpc_release = nfs4_renew_release, 5781 }; 5782 5783 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5784 { 5785 struct rpc_message msg = { 5786 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5787 .rpc_argp = clp, 5788 .rpc_cred = cred, 5789 }; 5790 struct nfs4_renewdata *data; 5791 5792 if (renew_flags == 0) 5793 return 0; 5794 if (!refcount_inc_not_zero(&clp->cl_count)) 5795 return -EIO; 5796 data = kmalloc(sizeof(*data), GFP_NOFS); 5797 if (data == NULL) { 5798 nfs_put_client(clp); 5799 return -ENOMEM; 5800 } 5801 data->client = clp; 5802 data->timestamp = jiffies; 5803 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5804 &nfs4_renew_ops, data); 5805 } 5806 5807 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5808 { 5809 struct rpc_message msg = { 5810 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5811 .rpc_argp = clp, 5812 .rpc_cred = cred, 5813 }; 5814 unsigned long now = jiffies; 5815 int status; 5816 5817 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5818 if (status < 0) 5819 return status; 5820 do_renew_lease(clp, now); 5821 return 0; 5822 } 5823 5824 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5825 enum nfs4_acl_type type) 5826 { 5827 switch (type) { 5828 default: 5829 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5830 case NFS4ACL_DACL: 5831 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5832 case NFS4ACL_SACL: 5833 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5834 } 5835 } 5836 5837 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5838 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5839 * the stack. 5840 */ 5841 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5842 5843 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5844 struct page **pages) 5845 { 5846 struct page *newpage, **spages; 5847 int rc = 0; 5848 size_t len; 5849 spages = pages; 5850 5851 do { 5852 len = min_t(size_t, PAGE_SIZE, buflen); 5853 newpage = alloc_page(GFP_KERNEL); 5854 5855 if (newpage == NULL) 5856 goto unwind; 5857 memcpy(page_address(newpage), buf, len); 5858 buf += len; 5859 buflen -= len; 5860 *pages++ = newpage; 5861 rc++; 5862 } while (buflen != 0); 5863 5864 return rc; 5865 5866 unwind: 5867 for(; rc > 0; rc--) 5868 __free_page(spages[rc-1]); 5869 return -ENOMEM; 5870 } 5871 5872 struct nfs4_cached_acl { 5873 enum nfs4_acl_type type; 5874 int cached; 5875 size_t len; 5876 char data[]; 5877 }; 5878 5879 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5880 { 5881 struct nfs_inode *nfsi = NFS_I(inode); 5882 5883 spin_lock(&inode->i_lock); 5884 kfree(nfsi->nfs4_acl); 5885 nfsi->nfs4_acl = acl; 5886 spin_unlock(&inode->i_lock); 5887 } 5888 5889 static void nfs4_zap_acl_attr(struct inode *inode) 5890 { 5891 nfs4_set_cached_acl(inode, NULL); 5892 } 5893 5894 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5895 size_t buflen, enum nfs4_acl_type type) 5896 { 5897 struct nfs_inode *nfsi = NFS_I(inode); 5898 struct nfs4_cached_acl *acl; 5899 int ret = -ENOENT; 5900 5901 spin_lock(&inode->i_lock); 5902 acl = nfsi->nfs4_acl; 5903 if (acl == NULL) 5904 goto out; 5905 if (acl->type != type) 5906 goto out; 5907 if (buf == NULL) /* user is just asking for length */ 5908 goto out_len; 5909 if (acl->cached == 0) 5910 goto out; 5911 ret = -ERANGE; /* see getxattr(2) man page */ 5912 if (acl->len > buflen) 5913 goto out; 5914 memcpy(buf, acl->data, acl->len); 5915 out_len: 5916 ret = acl->len; 5917 out: 5918 spin_unlock(&inode->i_lock); 5919 return ret; 5920 } 5921 5922 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5923 size_t pgbase, size_t acl_len, 5924 enum nfs4_acl_type type) 5925 { 5926 struct nfs4_cached_acl *acl; 5927 size_t buflen = sizeof(*acl) + acl_len; 5928 5929 if (buflen <= PAGE_SIZE) { 5930 acl = kmalloc(buflen, GFP_KERNEL); 5931 if (acl == NULL) 5932 goto out; 5933 acl->cached = 1; 5934 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5935 } else { 5936 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5937 if (acl == NULL) 5938 goto out; 5939 acl->cached = 0; 5940 } 5941 acl->type = type; 5942 acl->len = acl_len; 5943 out: 5944 nfs4_set_cached_acl(inode, acl); 5945 } 5946 5947 /* 5948 * The getxattr API returns the required buffer length when called with a 5949 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5950 * the required buf. On a NULL buf, we send a page of data to the server 5951 * guessing that the ACL request can be serviced by a page. If so, we cache 5952 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5953 * the cache. If not so, we throw away the page, and cache the required 5954 * length. The next getxattr call will then produce another round trip to 5955 * the server, this time with the input buf of the required size. 5956 */ 5957 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5958 size_t buflen, enum nfs4_acl_type type) 5959 { 5960 struct page **pages; 5961 struct nfs_getaclargs args = { 5962 .fh = NFS_FH(inode), 5963 .acl_type = type, 5964 .acl_len = buflen, 5965 }; 5966 struct nfs_getaclres res = { 5967 .acl_type = type, 5968 .acl_len = buflen, 5969 }; 5970 struct rpc_message msg = { 5971 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5972 .rpc_argp = &args, 5973 .rpc_resp = &res, 5974 }; 5975 unsigned int npages; 5976 int ret = -ENOMEM, i; 5977 struct nfs_server *server = NFS_SERVER(inode); 5978 5979 if (buflen == 0) 5980 buflen = server->rsize; 5981 5982 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5983 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5984 if (!pages) 5985 return -ENOMEM; 5986 5987 args.acl_pages = pages; 5988 5989 for (i = 0; i < npages; i++) { 5990 pages[i] = alloc_page(GFP_KERNEL); 5991 if (!pages[i]) 5992 goto out_free; 5993 } 5994 5995 /* for decoding across pages */ 5996 res.acl_scratch = alloc_page(GFP_KERNEL); 5997 if (!res.acl_scratch) 5998 goto out_free; 5999 6000 args.acl_len = npages * PAGE_SIZE; 6001 6002 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 6003 __func__, buf, buflen, npages, args.acl_len); 6004 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 6005 &msg, &args.seq_args, &res.seq_res, 0); 6006 if (ret) 6007 goto out_free; 6008 6009 /* Handle the case where the passed-in buffer is too short */ 6010 if (res.acl_flags & NFS4_ACL_TRUNC) { 6011 /* Did the user only issue a request for the acl length? */ 6012 if (buf == NULL) 6013 goto out_ok; 6014 ret = -ERANGE; 6015 goto out_free; 6016 } 6017 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 6018 type); 6019 if (buf) { 6020 if (res.acl_len > buflen) { 6021 ret = -ERANGE; 6022 goto out_free; 6023 } 6024 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 6025 } 6026 out_ok: 6027 ret = res.acl_len; 6028 out_free: 6029 while (--i >= 0) 6030 __free_page(pages[i]); 6031 if (res.acl_scratch) 6032 __free_page(res.acl_scratch); 6033 kfree(pages); 6034 return ret; 6035 } 6036 6037 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6038 size_t buflen, enum nfs4_acl_type type) 6039 { 6040 struct nfs4_exception exception = { 6041 .interruptible = true, 6042 }; 6043 ssize_t ret; 6044 do { 6045 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6046 trace_nfs4_get_acl(inode, ret); 6047 if (ret >= 0) 6048 break; 6049 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6050 } while (exception.retry); 6051 return ret; 6052 } 6053 6054 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6055 enum nfs4_acl_type type) 6056 { 6057 struct nfs_server *server = NFS_SERVER(inode); 6058 int ret; 6059 6060 if (!nfs4_server_supports_acls(server, type)) 6061 return -EOPNOTSUPP; 6062 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6063 if (ret < 0) 6064 return ret; 6065 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6066 nfs_zap_acl_cache(inode); 6067 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6068 if (ret != -ENOENT) 6069 /* -ENOENT is returned if there is no ACL or if there is an ACL 6070 * but no cached acl data, just the acl length */ 6071 return ret; 6072 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6073 } 6074 6075 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6076 size_t buflen, enum nfs4_acl_type type) 6077 { 6078 struct nfs_server *server = NFS_SERVER(inode); 6079 struct page *pages[NFS4ACL_MAXPAGES]; 6080 struct nfs_setaclargs arg = { 6081 .fh = NFS_FH(inode), 6082 .acl_type = type, 6083 .acl_len = buflen, 6084 .acl_pages = pages, 6085 }; 6086 struct nfs_setaclres res; 6087 struct rpc_message msg = { 6088 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6089 .rpc_argp = &arg, 6090 .rpc_resp = &res, 6091 }; 6092 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6093 int ret, i; 6094 6095 /* You can't remove system.nfs4_acl: */ 6096 if (buflen == 0) 6097 return -EINVAL; 6098 if (!nfs4_server_supports_acls(server, type)) 6099 return -EOPNOTSUPP; 6100 if (npages > ARRAY_SIZE(pages)) 6101 return -ERANGE; 6102 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6103 if (i < 0) 6104 return i; 6105 nfs4_inode_make_writeable(inode); 6106 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6107 6108 /* 6109 * Free each page after tx, so the only ref left is 6110 * held by the network stack 6111 */ 6112 for (; i > 0; i--) 6113 put_page(pages[i-1]); 6114 6115 /* 6116 * Acl update can result in inode attribute update. 6117 * so mark the attribute cache invalid. 6118 */ 6119 spin_lock(&inode->i_lock); 6120 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6121 NFS_INO_INVALID_CTIME | 6122 NFS_INO_REVAL_FORCED); 6123 spin_unlock(&inode->i_lock); 6124 nfs_access_zap_cache(inode); 6125 nfs_zap_acl_cache(inode); 6126 return ret; 6127 } 6128 6129 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6130 size_t buflen, enum nfs4_acl_type type) 6131 { 6132 struct nfs4_exception exception = { }; 6133 int err; 6134 do { 6135 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6136 trace_nfs4_set_acl(inode, err); 6137 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6138 /* 6139 * no need to retry since the kernel 6140 * isn't involved in encoding the ACEs. 6141 */ 6142 err = -EINVAL; 6143 break; 6144 } 6145 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6146 &exception); 6147 } while (exception.retry); 6148 return err; 6149 } 6150 6151 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6152 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6153 size_t buflen) 6154 { 6155 struct nfs_server *server = NFS_SERVER(inode); 6156 struct nfs4_label label = {0, 0, buflen, buf}; 6157 6158 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6159 struct nfs_fattr fattr = { 6160 .label = &label, 6161 }; 6162 struct nfs4_getattr_arg arg = { 6163 .fh = NFS_FH(inode), 6164 .bitmask = bitmask, 6165 }; 6166 struct nfs4_getattr_res res = { 6167 .fattr = &fattr, 6168 .server = server, 6169 }; 6170 struct rpc_message msg = { 6171 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6172 .rpc_argp = &arg, 6173 .rpc_resp = &res, 6174 }; 6175 int ret; 6176 6177 nfs_fattr_init(&fattr); 6178 6179 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6180 if (ret) 6181 return ret; 6182 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6183 return -ENOENT; 6184 return label.len; 6185 } 6186 6187 static int nfs4_get_security_label(struct inode *inode, void *buf, 6188 size_t buflen) 6189 { 6190 struct nfs4_exception exception = { 6191 .interruptible = true, 6192 }; 6193 int err; 6194 6195 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6196 return -EOPNOTSUPP; 6197 6198 do { 6199 err = _nfs4_get_security_label(inode, buf, buflen); 6200 trace_nfs4_get_security_label(inode, err); 6201 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6202 &exception); 6203 } while (exception.retry); 6204 return err; 6205 } 6206 6207 static int _nfs4_do_set_security_label(struct inode *inode, 6208 struct nfs4_label *ilabel, 6209 struct nfs_fattr *fattr) 6210 { 6211 6212 struct iattr sattr = {0}; 6213 struct nfs_server *server = NFS_SERVER(inode); 6214 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6215 struct nfs_setattrargs arg = { 6216 .fh = NFS_FH(inode), 6217 .iap = &sattr, 6218 .server = server, 6219 .bitmask = bitmask, 6220 .label = ilabel, 6221 }; 6222 struct nfs_setattrres res = { 6223 .fattr = fattr, 6224 .server = server, 6225 }; 6226 struct rpc_message msg = { 6227 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6228 .rpc_argp = &arg, 6229 .rpc_resp = &res, 6230 }; 6231 int status; 6232 6233 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6234 6235 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6236 if (status) 6237 dprintk("%s failed: %d\n", __func__, status); 6238 6239 return status; 6240 } 6241 6242 static int nfs4_do_set_security_label(struct inode *inode, 6243 struct nfs4_label *ilabel, 6244 struct nfs_fattr *fattr) 6245 { 6246 struct nfs4_exception exception = { }; 6247 int err; 6248 6249 do { 6250 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6251 trace_nfs4_set_security_label(inode, err); 6252 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6253 &exception); 6254 } while (exception.retry); 6255 return err; 6256 } 6257 6258 static int 6259 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6260 { 6261 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6262 struct nfs_fattr *fattr; 6263 int status; 6264 6265 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6266 return -EOPNOTSUPP; 6267 6268 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6269 if (fattr == NULL) 6270 return -ENOMEM; 6271 6272 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6273 if (status == 0) 6274 nfs_setsecurity(inode, fattr); 6275 6276 return status; 6277 } 6278 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6279 6280 6281 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6282 nfs4_verifier *bootverf) 6283 { 6284 __be32 verf[2]; 6285 6286 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6287 /* An impossible timestamp guarantees this value 6288 * will never match a generated boot time. */ 6289 verf[0] = cpu_to_be32(U32_MAX); 6290 verf[1] = cpu_to_be32(U32_MAX); 6291 } else { 6292 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6293 u64 ns = ktime_to_ns(nn->boot_time); 6294 6295 verf[0] = cpu_to_be32(ns >> 32); 6296 verf[1] = cpu_to_be32(ns); 6297 } 6298 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6299 } 6300 6301 static size_t 6302 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6303 { 6304 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6305 struct nfs_netns_client *nn_clp = nn->nfs_client; 6306 const char *id; 6307 6308 buf[0] = '\0'; 6309 6310 if (nn_clp) { 6311 rcu_read_lock(); 6312 id = rcu_dereference(nn_clp->identifier); 6313 if (id) 6314 strscpy(buf, id, buflen); 6315 rcu_read_unlock(); 6316 } 6317 6318 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6319 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6320 6321 return strlen(buf); 6322 } 6323 6324 static int 6325 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6326 { 6327 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6328 size_t buflen; 6329 size_t len; 6330 char *str; 6331 6332 if (clp->cl_owner_id != NULL) 6333 return 0; 6334 6335 rcu_read_lock(); 6336 len = 14 + 6337 strlen(clp->cl_rpcclient->cl_nodename) + 6338 1 + 6339 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6340 1; 6341 rcu_read_unlock(); 6342 6343 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6344 if (buflen) 6345 len += buflen + 1; 6346 6347 if (len > NFS4_OPAQUE_LIMIT + 1) 6348 return -EINVAL; 6349 6350 /* 6351 * Since this string is allocated at mount time, and held until the 6352 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6353 * about a memory-reclaim deadlock. 6354 */ 6355 str = kmalloc(len, GFP_KERNEL); 6356 if (!str) 6357 return -ENOMEM; 6358 6359 rcu_read_lock(); 6360 if (buflen) 6361 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6362 clp->cl_rpcclient->cl_nodename, buf, 6363 rpc_peeraddr2str(clp->cl_rpcclient, 6364 RPC_DISPLAY_ADDR)); 6365 else 6366 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6367 clp->cl_rpcclient->cl_nodename, 6368 rpc_peeraddr2str(clp->cl_rpcclient, 6369 RPC_DISPLAY_ADDR)); 6370 rcu_read_unlock(); 6371 6372 clp->cl_owner_id = str; 6373 return 0; 6374 } 6375 6376 static int 6377 nfs4_init_uniform_client_string(struct nfs_client *clp) 6378 { 6379 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6380 size_t buflen; 6381 size_t len; 6382 char *str; 6383 6384 if (clp->cl_owner_id != NULL) 6385 return 0; 6386 6387 len = 10 + 10 + 1 + 10 + 1 + 6388 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6389 6390 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6391 if (buflen) 6392 len += buflen + 1; 6393 6394 if (len > NFS4_OPAQUE_LIMIT + 1) 6395 return -EINVAL; 6396 6397 /* 6398 * Since this string is allocated at mount time, and held until the 6399 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6400 * about a memory-reclaim deadlock. 6401 */ 6402 str = kmalloc(len, GFP_KERNEL); 6403 if (!str) 6404 return -ENOMEM; 6405 6406 if (buflen) 6407 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6408 clp->rpc_ops->version, clp->cl_minorversion, 6409 buf, clp->cl_rpcclient->cl_nodename); 6410 else 6411 scnprintf(str, len, "Linux NFSv%u.%u %s", 6412 clp->rpc_ops->version, clp->cl_minorversion, 6413 clp->cl_rpcclient->cl_nodename); 6414 clp->cl_owner_id = str; 6415 return 0; 6416 } 6417 6418 /* 6419 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6420 * services. Advertise one based on the address family of the 6421 * clientaddr. 6422 */ 6423 static unsigned int 6424 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6425 { 6426 if (strchr(clp->cl_ipaddr, ':') != NULL) 6427 return scnprintf(buf, len, "tcp6"); 6428 else 6429 return scnprintf(buf, len, "tcp"); 6430 } 6431 6432 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6433 { 6434 struct nfs4_setclientid *sc = calldata; 6435 6436 if (task->tk_status == 0) 6437 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6438 } 6439 6440 static const struct rpc_call_ops nfs4_setclientid_ops = { 6441 .rpc_call_done = nfs4_setclientid_done, 6442 }; 6443 6444 /** 6445 * nfs4_proc_setclientid - Negotiate client ID 6446 * @clp: state data structure 6447 * @program: RPC program for NFSv4 callback service 6448 * @port: IP port number for NFS4 callback service 6449 * @cred: credential to use for this call 6450 * @res: where to place the result 6451 * 6452 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6453 */ 6454 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6455 unsigned short port, const struct cred *cred, 6456 struct nfs4_setclientid_res *res) 6457 { 6458 nfs4_verifier sc_verifier; 6459 struct nfs4_setclientid setclientid = { 6460 .sc_verifier = &sc_verifier, 6461 .sc_prog = program, 6462 .sc_clnt = clp, 6463 }; 6464 struct rpc_message msg = { 6465 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6466 .rpc_argp = &setclientid, 6467 .rpc_resp = res, 6468 .rpc_cred = cred, 6469 }; 6470 struct rpc_task_setup task_setup_data = { 6471 .rpc_client = clp->cl_rpcclient, 6472 .rpc_message = &msg, 6473 .callback_ops = &nfs4_setclientid_ops, 6474 .callback_data = &setclientid, 6475 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6476 }; 6477 unsigned long now = jiffies; 6478 int status; 6479 6480 /* nfs_client_id4 */ 6481 nfs4_init_boot_verifier(clp, &sc_verifier); 6482 6483 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6484 status = nfs4_init_uniform_client_string(clp); 6485 else 6486 status = nfs4_init_nonuniform_client_string(clp); 6487 6488 if (status) 6489 goto out; 6490 6491 /* cb_client4 */ 6492 setclientid.sc_netid_len = 6493 nfs4_init_callback_netid(clp, 6494 setclientid.sc_netid, 6495 sizeof(setclientid.sc_netid)); 6496 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6497 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6498 clp->cl_ipaddr, port >> 8, port & 255); 6499 6500 dprintk("NFS call setclientid auth=%s, '%s'\n", 6501 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6502 clp->cl_owner_id); 6503 6504 status = nfs4_call_sync_custom(&task_setup_data); 6505 if (setclientid.sc_cred) { 6506 kfree(clp->cl_acceptor); 6507 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6508 put_rpccred(setclientid.sc_cred); 6509 } 6510 6511 if (status == 0) 6512 do_renew_lease(clp, now); 6513 out: 6514 trace_nfs4_setclientid(clp, status); 6515 dprintk("NFS reply setclientid: %d\n", status); 6516 return status; 6517 } 6518 6519 /** 6520 * nfs4_proc_setclientid_confirm - Confirm client ID 6521 * @clp: state data structure 6522 * @arg: result of a previous SETCLIENTID 6523 * @cred: credential to use for this call 6524 * 6525 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6526 */ 6527 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6528 struct nfs4_setclientid_res *arg, 6529 const struct cred *cred) 6530 { 6531 struct rpc_message msg = { 6532 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6533 .rpc_argp = arg, 6534 .rpc_cred = cred, 6535 }; 6536 int status; 6537 6538 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6539 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6540 clp->cl_clientid); 6541 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6542 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6543 trace_nfs4_setclientid_confirm(clp, status); 6544 dprintk("NFS reply setclientid_confirm: %d\n", status); 6545 return status; 6546 } 6547 6548 struct nfs4_delegreturndata { 6549 struct nfs4_delegreturnargs args; 6550 struct nfs4_delegreturnres res; 6551 struct nfs_fh fh; 6552 nfs4_stateid stateid; 6553 unsigned long timestamp; 6554 struct { 6555 struct nfs4_layoutreturn_args arg; 6556 struct nfs4_layoutreturn_res res; 6557 struct nfs4_xdr_opaque_data ld_private; 6558 u32 roc_barrier; 6559 bool roc; 6560 } lr; 6561 struct nfs_fattr fattr; 6562 int rpc_status; 6563 struct inode *inode; 6564 }; 6565 6566 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6567 { 6568 struct nfs4_delegreturndata *data = calldata; 6569 struct nfs4_exception exception = { 6570 .inode = data->inode, 6571 .stateid = &data->stateid, 6572 .task_is_privileged = data->args.seq_args.sa_privileged, 6573 }; 6574 6575 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6576 return; 6577 6578 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6579 6580 /* Handle Layoutreturn errors */ 6581 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6582 &data->res.lr_ret) == -EAGAIN) 6583 goto out_restart; 6584 6585 switch (task->tk_status) { 6586 case 0: 6587 renew_lease(data->res.server, data->timestamp); 6588 break; 6589 case -NFS4ERR_ADMIN_REVOKED: 6590 case -NFS4ERR_DELEG_REVOKED: 6591 case -NFS4ERR_EXPIRED: 6592 nfs4_free_revoked_stateid(data->res.server, 6593 data->args.stateid, 6594 task->tk_msg.rpc_cred); 6595 fallthrough; 6596 case -NFS4ERR_BAD_STATEID: 6597 case -NFS4ERR_STALE_STATEID: 6598 case -ETIMEDOUT: 6599 task->tk_status = 0; 6600 break; 6601 case -NFS4ERR_OLD_STATEID: 6602 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6603 nfs4_stateid_seqid_inc(&data->stateid); 6604 if (data->args.bitmask) { 6605 data->args.bitmask = NULL; 6606 data->res.fattr = NULL; 6607 } 6608 goto out_restart; 6609 case -NFS4ERR_ACCESS: 6610 if (data->args.bitmask) { 6611 data->args.bitmask = NULL; 6612 data->res.fattr = NULL; 6613 goto out_restart; 6614 } 6615 fallthrough; 6616 default: 6617 task->tk_status = nfs4_async_handle_exception(task, 6618 data->res.server, task->tk_status, 6619 &exception); 6620 if (exception.retry) 6621 goto out_restart; 6622 } 6623 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6624 data->rpc_status = task->tk_status; 6625 return; 6626 out_restart: 6627 task->tk_status = 0; 6628 rpc_restart_call_prepare(task); 6629 } 6630 6631 static void nfs4_delegreturn_release(void *calldata) 6632 { 6633 struct nfs4_delegreturndata *data = calldata; 6634 struct inode *inode = data->inode; 6635 6636 if (data->lr.roc) 6637 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6638 data->res.lr_ret); 6639 if (inode) { 6640 nfs4_fattr_set_prechange(&data->fattr, 6641 inode_peek_iversion_raw(inode)); 6642 nfs_refresh_inode(inode, &data->fattr); 6643 nfs_iput_and_deactive(inode); 6644 } 6645 kfree(calldata); 6646 } 6647 6648 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6649 { 6650 struct nfs4_delegreturndata *d_data; 6651 struct pnfs_layout_hdr *lo; 6652 6653 d_data = data; 6654 6655 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6656 nfs4_sequence_done(task, &d_data->res.seq_res); 6657 return; 6658 } 6659 6660 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6661 if (lo && !pnfs_layout_is_valid(lo)) { 6662 d_data->args.lr_args = NULL; 6663 d_data->res.lr_res = NULL; 6664 } 6665 6666 nfs4_setup_sequence(d_data->res.server->nfs_client, 6667 &d_data->args.seq_args, 6668 &d_data->res.seq_res, 6669 task); 6670 } 6671 6672 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6673 .rpc_call_prepare = nfs4_delegreturn_prepare, 6674 .rpc_call_done = nfs4_delegreturn_done, 6675 .rpc_release = nfs4_delegreturn_release, 6676 }; 6677 6678 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6679 { 6680 struct nfs4_delegreturndata *data; 6681 struct nfs_server *server = NFS_SERVER(inode); 6682 struct rpc_task *task; 6683 struct rpc_message msg = { 6684 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6685 .rpc_cred = cred, 6686 }; 6687 struct rpc_task_setup task_setup_data = { 6688 .rpc_client = server->client, 6689 .rpc_message = &msg, 6690 .callback_ops = &nfs4_delegreturn_ops, 6691 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6692 }; 6693 int status = 0; 6694 6695 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6696 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6697 6698 data = kzalloc(sizeof(*data), GFP_KERNEL); 6699 if (data == NULL) 6700 return -ENOMEM; 6701 6702 nfs4_state_protect(server->nfs_client, 6703 NFS_SP4_MACH_CRED_CLEANUP, 6704 &task_setup_data.rpc_client, &msg); 6705 6706 data->args.fhandle = &data->fh; 6707 data->args.stateid = &data->stateid; 6708 nfs4_bitmask_set(data->args.bitmask_store, 6709 server->cache_consistency_bitmask, inode, 0); 6710 data->args.bitmask = data->args.bitmask_store; 6711 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6712 nfs4_stateid_copy(&data->stateid, stateid); 6713 data->res.fattr = &data->fattr; 6714 data->res.server = server; 6715 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6716 data->lr.arg.ld_private = &data->lr.ld_private; 6717 nfs_fattr_init(data->res.fattr); 6718 data->timestamp = jiffies; 6719 data->rpc_status = 0; 6720 data->inode = nfs_igrab_and_active(inode); 6721 if (data->inode || issync) { 6722 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6723 cred); 6724 if (data->lr.roc) { 6725 data->args.lr_args = &data->lr.arg; 6726 data->res.lr_res = &data->lr.res; 6727 } 6728 } 6729 6730 if (!data->inode) 6731 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6732 1); 6733 else 6734 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6735 0); 6736 task_setup_data.callback_data = data; 6737 msg.rpc_argp = &data->args; 6738 msg.rpc_resp = &data->res; 6739 task = rpc_run_task(&task_setup_data); 6740 if (IS_ERR(task)) 6741 return PTR_ERR(task); 6742 if (!issync) 6743 goto out; 6744 status = rpc_wait_for_completion_task(task); 6745 if (status != 0) 6746 goto out; 6747 status = data->rpc_status; 6748 out: 6749 rpc_put_task(task); 6750 return status; 6751 } 6752 6753 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6754 { 6755 struct nfs_server *server = NFS_SERVER(inode); 6756 struct nfs4_exception exception = { }; 6757 int err; 6758 do { 6759 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6760 trace_nfs4_delegreturn(inode, stateid, err); 6761 switch (err) { 6762 case -NFS4ERR_STALE_STATEID: 6763 case -NFS4ERR_EXPIRED: 6764 case 0: 6765 return 0; 6766 } 6767 err = nfs4_handle_exception(server, err, &exception); 6768 } while (exception.retry); 6769 return err; 6770 } 6771 6772 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6773 { 6774 struct inode *inode = state->inode; 6775 struct nfs_server *server = NFS_SERVER(inode); 6776 struct nfs_client *clp = server->nfs_client; 6777 struct nfs_lockt_args arg = { 6778 .fh = NFS_FH(inode), 6779 .fl = request, 6780 }; 6781 struct nfs_lockt_res res = { 6782 .denied = request, 6783 }; 6784 struct rpc_message msg = { 6785 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6786 .rpc_argp = &arg, 6787 .rpc_resp = &res, 6788 .rpc_cred = state->owner->so_cred, 6789 }; 6790 struct nfs4_lock_state *lsp; 6791 int status; 6792 6793 arg.lock_owner.clientid = clp->cl_clientid; 6794 status = nfs4_set_lock_state(state, request); 6795 if (status != 0) 6796 goto out; 6797 lsp = request->fl_u.nfs4_fl.owner; 6798 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6799 arg.lock_owner.s_dev = server->s_dev; 6800 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6801 switch (status) { 6802 case 0: 6803 request->fl_type = F_UNLCK; 6804 break; 6805 case -NFS4ERR_DENIED: 6806 status = 0; 6807 } 6808 request->fl_ops->fl_release_private(request); 6809 request->fl_ops = NULL; 6810 out: 6811 return status; 6812 } 6813 6814 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6815 { 6816 struct nfs4_exception exception = { 6817 .interruptible = true, 6818 }; 6819 int err; 6820 6821 do { 6822 err = _nfs4_proc_getlk(state, cmd, request); 6823 trace_nfs4_get_lock(request, state, cmd, err); 6824 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6825 &exception); 6826 } while (exception.retry); 6827 return err; 6828 } 6829 6830 /* 6831 * Update the seqid of a lock stateid after receiving 6832 * NFS4ERR_OLD_STATEID 6833 */ 6834 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6835 struct nfs4_lock_state *lsp) 6836 { 6837 struct nfs4_state *state = lsp->ls_state; 6838 bool ret = false; 6839 6840 spin_lock(&state->state_lock); 6841 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6842 goto out; 6843 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6844 nfs4_stateid_seqid_inc(dst); 6845 else 6846 dst->seqid = lsp->ls_stateid.seqid; 6847 ret = true; 6848 out: 6849 spin_unlock(&state->state_lock); 6850 return ret; 6851 } 6852 6853 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6854 struct nfs4_lock_state *lsp) 6855 { 6856 struct nfs4_state *state = lsp->ls_state; 6857 bool ret; 6858 6859 spin_lock(&state->state_lock); 6860 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6861 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6862 spin_unlock(&state->state_lock); 6863 return ret; 6864 } 6865 6866 struct nfs4_unlockdata { 6867 struct nfs_locku_args arg; 6868 struct nfs_locku_res res; 6869 struct nfs4_lock_state *lsp; 6870 struct nfs_open_context *ctx; 6871 struct nfs_lock_context *l_ctx; 6872 struct file_lock fl; 6873 struct nfs_server *server; 6874 unsigned long timestamp; 6875 }; 6876 6877 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6878 struct nfs_open_context *ctx, 6879 struct nfs4_lock_state *lsp, 6880 struct nfs_seqid *seqid) 6881 { 6882 struct nfs4_unlockdata *p; 6883 struct nfs4_state *state = lsp->ls_state; 6884 struct inode *inode = state->inode; 6885 6886 p = kzalloc(sizeof(*p), GFP_KERNEL); 6887 if (p == NULL) 6888 return NULL; 6889 p->arg.fh = NFS_FH(inode); 6890 p->arg.fl = &p->fl; 6891 p->arg.seqid = seqid; 6892 p->res.seqid = seqid; 6893 p->lsp = lsp; 6894 /* Ensure we don't close file until we're done freeing locks! */ 6895 p->ctx = get_nfs_open_context(ctx); 6896 p->l_ctx = nfs_get_lock_context(ctx); 6897 locks_init_lock(&p->fl); 6898 locks_copy_lock(&p->fl, fl); 6899 p->server = NFS_SERVER(inode); 6900 spin_lock(&state->state_lock); 6901 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6902 spin_unlock(&state->state_lock); 6903 return p; 6904 } 6905 6906 static void nfs4_locku_release_calldata(void *data) 6907 { 6908 struct nfs4_unlockdata *calldata = data; 6909 nfs_free_seqid(calldata->arg.seqid); 6910 nfs4_put_lock_state(calldata->lsp); 6911 nfs_put_lock_context(calldata->l_ctx); 6912 put_nfs_open_context(calldata->ctx); 6913 kfree(calldata); 6914 } 6915 6916 static void nfs4_locku_done(struct rpc_task *task, void *data) 6917 { 6918 struct nfs4_unlockdata *calldata = data; 6919 struct nfs4_exception exception = { 6920 .inode = calldata->lsp->ls_state->inode, 6921 .stateid = &calldata->arg.stateid, 6922 }; 6923 6924 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6925 return; 6926 switch (task->tk_status) { 6927 case 0: 6928 renew_lease(calldata->server, calldata->timestamp); 6929 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6930 if (nfs4_update_lock_stateid(calldata->lsp, 6931 &calldata->res.stateid)) 6932 break; 6933 fallthrough; 6934 case -NFS4ERR_ADMIN_REVOKED: 6935 case -NFS4ERR_EXPIRED: 6936 nfs4_free_revoked_stateid(calldata->server, 6937 &calldata->arg.stateid, 6938 task->tk_msg.rpc_cred); 6939 fallthrough; 6940 case -NFS4ERR_BAD_STATEID: 6941 case -NFS4ERR_STALE_STATEID: 6942 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6943 calldata->lsp)) 6944 rpc_restart_call_prepare(task); 6945 break; 6946 case -NFS4ERR_OLD_STATEID: 6947 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6948 calldata->lsp)) 6949 rpc_restart_call_prepare(task); 6950 break; 6951 default: 6952 task->tk_status = nfs4_async_handle_exception(task, 6953 calldata->server, task->tk_status, 6954 &exception); 6955 if (exception.retry) 6956 rpc_restart_call_prepare(task); 6957 } 6958 nfs_release_seqid(calldata->arg.seqid); 6959 } 6960 6961 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6962 { 6963 struct nfs4_unlockdata *calldata = data; 6964 6965 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6966 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6967 return; 6968 6969 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6970 goto out_wait; 6971 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6972 /* Note: exit _without_ running nfs4_locku_done */ 6973 goto out_no_action; 6974 } 6975 calldata->timestamp = jiffies; 6976 if (nfs4_setup_sequence(calldata->server->nfs_client, 6977 &calldata->arg.seq_args, 6978 &calldata->res.seq_res, 6979 task) != 0) 6980 nfs_release_seqid(calldata->arg.seqid); 6981 return; 6982 out_no_action: 6983 task->tk_action = NULL; 6984 out_wait: 6985 nfs4_sequence_done(task, &calldata->res.seq_res); 6986 } 6987 6988 static const struct rpc_call_ops nfs4_locku_ops = { 6989 .rpc_call_prepare = nfs4_locku_prepare, 6990 .rpc_call_done = nfs4_locku_done, 6991 .rpc_release = nfs4_locku_release_calldata, 6992 }; 6993 6994 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6995 struct nfs_open_context *ctx, 6996 struct nfs4_lock_state *lsp, 6997 struct nfs_seqid *seqid) 6998 { 6999 struct nfs4_unlockdata *data; 7000 struct rpc_message msg = { 7001 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 7002 .rpc_cred = ctx->cred, 7003 }; 7004 struct rpc_task_setup task_setup_data = { 7005 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 7006 .rpc_message = &msg, 7007 .callback_ops = &nfs4_locku_ops, 7008 .workqueue = nfsiod_workqueue, 7009 .flags = RPC_TASK_ASYNC, 7010 }; 7011 7012 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 7013 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7014 7015 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 7016 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 7017 7018 /* Ensure this is an unlock - when canceling a lock, the 7019 * canceled lock is passed in, and it won't be an unlock. 7020 */ 7021 fl->fl_type = F_UNLCK; 7022 if (fl->fl_flags & FL_CLOSE) 7023 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 7024 7025 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7026 if (data == NULL) { 7027 nfs_free_seqid(seqid); 7028 return ERR_PTR(-ENOMEM); 7029 } 7030 7031 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7032 msg.rpc_argp = &data->arg; 7033 msg.rpc_resp = &data->res; 7034 task_setup_data.callback_data = data; 7035 return rpc_run_task(&task_setup_data); 7036 } 7037 7038 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7039 { 7040 struct inode *inode = state->inode; 7041 struct nfs4_state_owner *sp = state->owner; 7042 struct nfs_inode *nfsi = NFS_I(inode); 7043 struct nfs_seqid *seqid; 7044 struct nfs4_lock_state *lsp; 7045 struct rpc_task *task; 7046 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7047 int status = 0; 7048 unsigned char fl_flags = request->fl_flags; 7049 7050 status = nfs4_set_lock_state(state, request); 7051 /* Unlock _before_ we do the RPC call */ 7052 request->fl_flags |= FL_EXISTS; 7053 /* Exclude nfs_delegation_claim_locks() */ 7054 mutex_lock(&sp->so_delegreturn_mutex); 7055 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7056 down_read(&nfsi->rwsem); 7057 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7058 up_read(&nfsi->rwsem); 7059 mutex_unlock(&sp->so_delegreturn_mutex); 7060 goto out; 7061 } 7062 lsp = request->fl_u.nfs4_fl.owner; 7063 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7064 up_read(&nfsi->rwsem); 7065 mutex_unlock(&sp->so_delegreturn_mutex); 7066 if (status != 0) 7067 goto out; 7068 /* Is this a delegated lock? */ 7069 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7070 goto out; 7071 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7072 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7073 status = -ENOMEM; 7074 if (IS_ERR(seqid)) 7075 goto out; 7076 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7077 status = PTR_ERR(task); 7078 if (IS_ERR(task)) 7079 goto out; 7080 status = rpc_wait_for_completion_task(task); 7081 rpc_put_task(task); 7082 out: 7083 request->fl_flags = fl_flags; 7084 trace_nfs4_unlock(request, state, F_SETLK, status); 7085 return status; 7086 } 7087 7088 struct nfs4_lockdata { 7089 struct nfs_lock_args arg; 7090 struct nfs_lock_res res; 7091 struct nfs4_lock_state *lsp; 7092 struct nfs_open_context *ctx; 7093 struct file_lock fl; 7094 unsigned long timestamp; 7095 int rpc_status; 7096 int cancelled; 7097 struct nfs_server *server; 7098 }; 7099 7100 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7101 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7102 gfp_t gfp_mask) 7103 { 7104 struct nfs4_lockdata *p; 7105 struct inode *inode = lsp->ls_state->inode; 7106 struct nfs_server *server = NFS_SERVER(inode); 7107 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7108 7109 p = kzalloc(sizeof(*p), gfp_mask); 7110 if (p == NULL) 7111 return NULL; 7112 7113 p->arg.fh = NFS_FH(inode); 7114 p->arg.fl = &p->fl; 7115 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7116 if (IS_ERR(p->arg.open_seqid)) 7117 goto out_free; 7118 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7119 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7120 if (IS_ERR(p->arg.lock_seqid)) 7121 goto out_free_seqid; 7122 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7123 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7124 p->arg.lock_owner.s_dev = server->s_dev; 7125 p->res.lock_seqid = p->arg.lock_seqid; 7126 p->lsp = lsp; 7127 p->server = server; 7128 p->ctx = get_nfs_open_context(ctx); 7129 locks_init_lock(&p->fl); 7130 locks_copy_lock(&p->fl, fl); 7131 return p; 7132 out_free_seqid: 7133 nfs_free_seqid(p->arg.open_seqid); 7134 out_free: 7135 kfree(p); 7136 return NULL; 7137 } 7138 7139 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7140 { 7141 struct nfs4_lockdata *data = calldata; 7142 struct nfs4_state *state = data->lsp->ls_state; 7143 7144 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7145 goto out_wait; 7146 /* Do we need to do an open_to_lock_owner? */ 7147 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7148 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7149 goto out_release_lock_seqid; 7150 } 7151 nfs4_stateid_copy(&data->arg.open_stateid, 7152 &state->open_stateid); 7153 data->arg.new_lock_owner = 1; 7154 data->res.open_seqid = data->arg.open_seqid; 7155 } else { 7156 data->arg.new_lock_owner = 0; 7157 nfs4_stateid_copy(&data->arg.lock_stateid, 7158 &data->lsp->ls_stateid); 7159 } 7160 if (!nfs4_valid_open_stateid(state)) { 7161 data->rpc_status = -EBADF; 7162 task->tk_action = NULL; 7163 goto out_release_open_seqid; 7164 } 7165 data->timestamp = jiffies; 7166 if (nfs4_setup_sequence(data->server->nfs_client, 7167 &data->arg.seq_args, 7168 &data->res.seq_res, 7169 task) == 0) 7170 return; 7171 out_release_open_seqid: 7172 nfs_release_seqid(data->arg.open_seqid); 7173 out_release_lock_seqid: 7174 nfs_release_seqid(data->arg.lock_seqid); 7175 out_wait: 7176 nfs4_sequence_done(task, &data->res.seq_res); 7177 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7178 } 7179 7180 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7181 { 7182 struct nfs4_lockdata *data = calldata; 7183 struct nfs4_lock_state *lsp = data->lsp; 7184 7185 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7186 return; 7187 7188 data->rpc_status = task->tk_status; 7189 switch (task->tk_status) { 7190 case 0: 7191 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7192 data->timestamp); 7193 if (data->arg.new_lock && !data->cancelled) { 7194 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7195 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7196 goto out_restart; 7197 } 7198 if (data->arg.new_lock_owner != 0) { 7199 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7200 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7201 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7202 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7203 goto out_restart; 7204 break; 7205 case -NFS4ERR_OLD_STATEID: 7206 if (data->arg.new_lock_owner != 0 && 7207 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7208 lsp->ls_state)) 7209 goto out_restart; 7210 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7211 goto out_restart; 7212 fallthrough; 7213 case -NFS4ERR_BAD_STATEID: 7214 case -NFS4ERR_STALE_STATEID: 7215 case -NFS4ERR_EXPIRED: 7216 if (data->arg.new_lock_owner != 0) { 7217 if (!nfs4_stateid_match(&data->arg.open_stateid, 7218 &lsp->ls_state->open_stateid)) 7219 goto out_restart; 7220 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7221 &lsp->ls_stateid)) 7222 goto out_restart; 7223 } 7224 out_done: 7225 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7226 return; 7227 out_restart: 7228 if (!data->cancelled) 7229 rpc_restart_call_prepare(task); 7230 goto out_done; 7231 } 7232 7233 static void nfs4_lock_release(void *calldata) 7234 { 7235 struct nfs4_lockdata *data = calldata; 7236 7237 nfs_free_seqid(data->arg.open_seqid); 7238 if (data->cancelled && data->rpc_status == 0) { 7239 struct rpc_task *task; 7240 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7241 data->arg.lock_seqid); 7242 if (!IS_ERR(task)) 7243 rpc_put_task_async(task); 7244 dprintk("%s: cancelling lock!\n", __func__); 7245 } else 7246 nfs_free_seqid(data->arg.lock_seqid); 7247 nfs4_put_lock_state(data->lsp); 7248 put_nfs_open_context(data->ctx); 7249 kfree(data); 7250 } 7251 7252 static const struct rpc_call_ops nfs4_lock_ops = { 7253 .rpc_call_prepare = nfs4_lock_prepare, 7254 .rpc_call_done = nfs4_lock_done, 7255 .rpc_release = nfs4_lock_release, 7256 }; 7257 7258 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7259 { 7260 switch (error) { 7261 case -NFS4ERR_ADMIN_REVOKED: 7262 case -NFS4ERR_EXPIRED: 7263 case -NFS4ERR_BAD_STATEID: 7264 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7265 if (new_lock_owner != 0 || 7266 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7267 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7268 break; 7269 case -NFS4ERR_STALE_STATEID: 7270 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7271 nfs4_schedule_lease_recovery(server->nfs_client); 7272 } 7273 } 7274 7275 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7276 { 7277 struct nfs4_lockdata *data; 7278 struct rpc_task *task; 7279 struct rpc_message msg = { 7280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7281 .rpc_cred = state->owner->so_cred, 7282 }; 7283 struct rpc_task_setup task_setup_data = { 7284 .rpc_client = NFS_CLIENT(state->inode), 7285 .rpc_message = &msg, 7286 .callback_ops = &nfs4_lock_ops, 7287 .workqueue = nfsiod_workqueue, 7288 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7289 }; 7290 int ret; 7291 7292 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7293 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7294 7295 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7296 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7297 if (data == NULL) 7298 return -ENOMEM; 7299 if (IS_SETLKW(cmd)) 7300 data->arg.block = 1; 7301 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7302 recovery_type > NFS_LOCK_NEW); 7303 msg.rpc_argp = &data->arg; 7304 msg.rpc_resp = &data->res; 7305 task_setup_data.callback_data = data; 7306 if (recovery_type > NFS_LOCK_NEW) { 7307 if (recovery_type == NFS_LOCK_RECLAIM) 7308 data->arg.reclaim = NFS_LOCK_RECLAIM; 7309 } else 7310 data->arg.new_lock = 1; 7311 task = rpc_run_task(&task_setup_data); 7312 if (IS_ERR(task)) 7313 return PTR_ERR(task); 7314 ret = rpc_wait_for_completion_task(task); 7315 if (ret == 0) { 7316 ret = data->rpc_status; 7317 if (ret) 7318 nfs4_handle_setlk_error(data->server, data->lsp, 7319 data->arg.new_lock_owner, ret); 7320 } else 7321 data->cancelled = true; 7322 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7323 rpc_put_task(task); 7324 dprintk("%s: ret = %d\n", __func__, ret); 7325 return ret; 7326 } 7327 7328 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7329 { 7330 struct nfs_server *server = NFS_SERVER(state->inode); 7331 struct nfs4_exception exception = { 7332 .inode = state->inode, 7333 }; 7334 int err; 7335 7336 do { 7337 /* Cache the lock if possible... */ 7338 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7339 return 0; 7340 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7341 if (err != -NFS4ERR_DELAY) 7342 break; 7343 nfs4_handle_exception(server, err, &exception); 7344 } while (exception.retry); 7345 return err; 7346 } 7347 7348 static int nfs4_lock_expired(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 err = nfs4_set_lock_state(state, request); 7357 if (err != 0) 7358 return err; 7359 if (!recover_lost_locks) { 7360 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7361 return 0; 7362 } 7363 do { 7364 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7365 return 0; 7366 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7367 switch (err) { 7368 default: 7369 goto out; 7370 case -NFS4ERR_GRACE: 7371 case -NFS4ERR_DELAY: 7372 nfs4_handle_exception(server, err, &exception); 7373 err = 0; 7374 } 7375 } while (exception.retry); 7376 out: 7377 return err; 7378 } 7379 7380 #if defined(CONFIG_NFS_V4_1) 7381 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7382 { 7383 struct nfs4_lock_state *lsp; 7384 int status; 7385 7386 status = nfs4_set_lock_state(state, request); 7387 if (status != 0) 7388 return status; 7389 lsp = request->fl_u.nfs4_fl.owner; 7390 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7391 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7392 return 0; 7393 return nfs4_lock_expired(state, request); 7394 } 7395 #endif 7396 7397 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7398 { 7399 struct nfs_inode *nfsi = NFS_I(state->inode); 7400 struct nfs4_state_owner *sp = state->owner; 7401 unsigned char fl_flags = request->fl_flags; 7402 int status; 7403 7404 request->fl_flags |= FL_ACCESS; 7405 status = locks_lock_inode_wait(state->inode, request); 7406 if (status < 0) 7407 goto out; 7408 mutex_lock(&sp->so_delegreturn_mutex); 7409 down_read(&nfsi->rwsem); 7410 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7411 /* Yes: cache locks! */ 7412 /* ...but avoid races with delegation recall... */ 7413 request->fl_flags = fl_flags & ~FL_SLEEP; 7414 status = locks_lock_inode_wait(state->inode, request); 7415 up_read(&nfsi->rwsem); 7416 mutex_unlock(&sp->so_delegreturn_mutex); 7417 goto out; 7418 } 7419 up_read(&nfsi->rwsem); 7420 mutex_unlock(&sp->so_delegreturn_mutex); 7421 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7422 out: 7423 request->fl_flags = fl_flags; 7424 return status; 7425 } 7426 7427 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7428 { 7429 struct nfs4_exception exception = { 7430 .state = state, 7431 .inode = state->inode, 7432 .interruptible = true, 7433 }; 7434 int err; 7435 7436 do { 7437 err = _nfs4_proc_setlk(state, cmd, request); 7438 if (err == -NFS4ERR_DENIED) 7439 err = -EAGAIN; 7440 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7441 err, &exception); 7442 } while (exception.retry); 7443 return err; 7444 } 7445 7446 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7447 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7448 7449 static int 7450 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7451 struct file_lock *request) 7452 { 7453 int status = -ERESTARTSYS; 7454 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7455 7456 while(!signalled()) { 7457 status = nfs4_proc_setlk(state, cmd, request); 7458 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7459 break; 7460 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7461 schedule_timeout(timeout); 7462 timeout *= 2; 7463 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7464 status = -ERESTARTSYS; 7465 } 7466 return status; 7467 } 7468 7469 #ifdef CONFIG_NFS_V4_1 7470 struct nfs4_lock_waiter { 7471 struct inode *inode; 7472 struct nfs_lowner owner; 7473 wait_queue_entry_t wait; 7474 }; 7475 7476 static int 7477 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7478 { 7479 struct nfs4_lock_waiter *waiter = 7480 container_of(wait, struct nfs4_lock_waiter, wait); 7481 7482 /* NULL key means to wake up everyone */ 7483 if (key) { 7484 struct cb_notify_lock_args *cbnl = key; 7485 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7486 *wowner = &waiter->owner; 7487 7488 /* Only wake if the callback was for the same owner. */ 7489 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7490 return 0; 7491 7492 /* Make sure it's for the right inode */ 7493 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7494 return 0; 7495 } 7496 7497 return woken_wake_function(wait, mode, flags, key); 7498 } 7499 7500 static int 7501 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7502 { 7503 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7504 struct nfs_server *server = NFS_SERVER(state->inode); 7505 struct nfs_client *clp = server->nfs_client; 7506 wait_queue_head_t *q = &clp->cl_lock_waitq; 7507 struct nfs4_lock_waiter waiter = { 7508 .inode = state->inode, 7509 .owner = { .clientid = clp->cl_clientid, 7510 .id = lsp->ls_seqid.owner_id, 7511 .s_dev = server->s_dev }, 7512 }; 7513 int status; 7514 7515 /* Don't bother with waitqueue if we don't expect a callback */ 7516 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7517 return nfs4_retry_setlk_simple(state, cmd, request); 7518 7519 init_wait(&waiter.wait); 7520 waiter.wait.func = nfs4_wake_lock_waiter; 7521 add_wait_queue(q, &waiter.wait); 7522 7523 do { 7524 status = nfs4_proc_setlk(state, cmd, request); 7525 if (status != -EAGAIN || IS_SETLK(cmd)) 7526 break; 7527 7528 status = -ERESTARTSYS; 7529 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7530 NFS4_LOCK_MAXTIMEOUT); 7531 } while (!signalled()); 7532 7533 remove_wait_queue(q, &waiter.wait); 7534 7535 return status; 7536 } 7537 #else /* !CONFIG_NFS_V4_1 */ 7538 static inline int 7539 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7540 { 7541 return nfs4_retry_setlk_simple(state, cmd, request); 7542 } 7543 #endif 7544 7545 static int 7546 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7547 { 7548 struct nfs_open_context *ctx; 7549 struct nfs4_state *state; 7550 int status; 7551 7552 /* verify open state */ 7553 ctx = nfs_file_open_context(filp); 7554 state = ctx->state; 7555 7556 if (IS_GETLK(cmd)) { 7557 if (state != NULL) 7558 return nfs4_proc_getlk(state, F_GETLK, request); 7559 return 0; 7560 } 7561 7562 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7563 return -EINVAL; 7564 7565 if (request->fl_type == F_UNLCK) { 7566 if (state != NULL) 7567 return nfs4_proc_unlck(state, cmd, request); 7568 return 0; 7569 } 7570 7571 if (state == NULL) 7572 return -ENOLCK; 7573 7574 if ((request->fl_flags & FL_POSIX) && 7575 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7576 return -ENOLCK; 7577 7578 /* 7579 * Don't rely on the VFS having checked the file open mode, 7580 * since it won't do this for flock() locks. 7581 */ 7582 switch (request->fl_type) { 7583 case F_RDLCK: 7584 if (!(filp->f_mode & FMODE_READ)) 7585 return -EBADF; 7586 break; 7587 case F_WRLCK: 7588 if (!(filp->f_mode & FMODE_WRITE)) 7589 return -EBADF; 7590 } 7591 7592 status = nfs4_set_lock_state(state, request); 7593 if (status != 0) 7594 return status; 7595 7596 return nfs4_retry_setlk(state, cmd, request); 7597 } 7598 7599 static int nfs4_delete_lease(struct file *file, void **priv) 7600 { 7601 return generic_setlease(file, F_UNLCK, NULL, priv); 7602 } 7603 7604 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease, 7605 void **priv) 7606 { 7607 struct inode *inode = file_inode(file); 7608 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7609 int ret; 7610 7611 /* No delegation, no lease */ 7612 if (!nfs4_have_delegation(inode, type)) 7613 return -EAGAIN; 7614 ret = generic_setlease(file, arg, lease, priv); 7615 if (ret || nfs4_have_delegation(inode, type)) 7616 return ret; 7617 /* We raced with a delegation return */ 7618 nfs4_delete_lease(file, priv); 7619 return -EAGAIN; 7620 } 7621 7622 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease, 7623 void **priv) 7624 { 7625 switch (arg) { 7626 case F_RDLCK: 7627 case F_WRLCK: 7628 return nfs4_add_lease(file, arg, lease, priv); 7629 case F_UNLCK: 7630 return nfs4_delete_lease(file, priv); 7631 default: 7632 return -EINVAL; 7633 } 7634 } 7635 7636 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7637 { 7638 struct nfs_server *server = NFS_SERVER(state->inode); 7639 int err; 7640 7641 err = nfs4_set_lock_state(state, fl); 7642 if (err != 0) 7643 return err; 7644 do { 7645 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7646 if (err != -NFS4ERR_DELAY) 7647 break; 7648 ssleep(1); 7649 } while (err == -NFS4ERR_DELAY); 7650 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7651 } 7652 7653 struct nfs_release_lockowner_data { 7654 struct nfs4_lock_state *lsp; 7655 struct nfs_server *server; 7656 struct nfs_release_lockowner_args args; 7657 struct nfs_release_lockowner_res res; 7658 unsigned long timestamp; 7659 }; 7660 7661 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7662 { 7663 struct nfs_release_lockowner_data *data = calldata; 7664 struct nfs_server *server = data->server; 7665 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7666 &data->res.seq_res, task); 7667 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7668 data->timestamp = jiffies; 7669 } 7670 7671 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7672 { 7673 struct nfs_release_lockowner_data *data = calldata; 7674 struct nfs_server *server = data->server; 7675 7676 nfs40_sequence_done(task, &data->res.seq_res); 7677 7678 switch (task->tk_status) { 7679 case 0: 7680 renew_lease(server, data->timestamp); 7681 break; 7682 case -NFS4ERR_STALE_CLIENTID: 7683 case -NFS4ERR_EXPIRED: 7684 nfs4_schedule_lease_recovery(server->nfs_client); 7685 break; 7686 case -NFS4ERR_LEASE_MOVED: 7687 case -NFS4ERR_DELAY: 7688 if (nfs4_async_handle_error(task, server, 7689 NULL, NULL) == -EAGAIN) 7690 rpc_restart_call_prepare(task); 7691 } 7692 } 7693 7694 static void nfs4_release_lockowner_release(void *calldata) 7695 { 7696 struct nfs_release_lockowner_data *data = calldata; 7697 nfs4_free_lock_state(data->server, data->lsp); 7698 kfree(calldata); 7699 } 7700 7701 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7702 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7703 .rpc_call_done = nfs4_release_lockowner_done, 7704 .rpc_release = nfs4_release_lockowner_release, 7705 }; 7706 7707 static void 7708 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7709 { 7710 struct nfs_release_lockowner_data *data; 7711 struct rpc_message msg = { 7712 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7713 }; 7714 7715 if (server->nfs_client->cl_mvops->minor_version != 0) 7716 return; 7717 7718 data = kmalloc(sizeof(*data), GFP_KERNEL); 7719 if (!data) 7720 return; 7721 data->lsp = lsp; 7722 data->server = server; 7723 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7724 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7725 data->args.lock_owner.s_dev = server->s_dev; 7726 7727 msg.rpc_argp = &data->args; 7728 msg.rpc_resp = &data->res; 7729 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7730 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7731 } 7732 7733 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7734 7735 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7736 struct mnt_idmap *idmap, 7737 struct dentry *unused, struct inode *inode, 7738 const char *key, const void *buf, 7739 size_t buflen, int flags) 7740 { 7741 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7742 } 7743 7744 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7745 struct dentry *unused, struct inode *inode, 7746 const char *key, void *buf, size_t buflen) 7747 { 7748 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7749 } 7750 7751 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7752 { 7753 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7754 } 7755 7756 #if defined(CONFIG_NFS_V4_1) 7757 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7758 7759 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7760 struct mnt_idmap *idmap, 7761 struct dentry *unused, struct inode *inode, 7762 const char *key, const void *buf, 7763 size_t buflen, int flags) 7764 { 7765 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7766 } 7767 7768 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7769 struct dentry *unused, struct inode *inode, 7770 const char *key, void *buf, size_t buflen) 7771 { 7772 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7773 } 7774 7775 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7776 { 7777 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7778 } 7779 7780 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7781 7782 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7783 struct mnt_idmap *idmap, 7784 struct dentry *unused, struct inode *inode, 7785 const char *key, const void *buf, 7786 size_t buflen, int flags) 7787 { 7788 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7789 } 7790 7791 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7792 struct dentry *unused, struct inode *inode, 7793 const char *key, void *buf, size_t buflen) 7794 { 7795 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7796 } 7797 7798 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7799 { 7800 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7801 } 7802 7803 #endif 7804 7805 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7806 7807 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7808 struct mnt_idmap *idmap, 7809 struct dentry *unused, struct inode *inode, 7810 const char *key, const void *buf, 7811 size_t buflen, int flags) 7812 { 7813 if (security_ismaclabel(key)) 7814 return nfs4_set_security_label(inode, buf, buflen); 7815 7816 return -EOPNOTSUPP; 7817 } 7818 7819 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7820 struct dentry *unused, struct inode *inode, 7821 const char *key, void *buf, size_t buflen) 7822 { 7823 if (security_ismaclabel(key)) 7824 return nfs4_get_security_label(inode, buf, buflen); 7825 return -EOPNOTSUPP; 7826 } 7827 7828 static ssize_t 7829 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7830 { 7831 int len = 0; 7832 7833 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7834 len = security_inode_listsecurity(inode, list, list_len); 7835 if (len >= 0 && list_len && len > list_len) 7836 return -ERANGE; 7837 } 7838 return len; 7839 } 7840 7841 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7842 .prefix = XATTR_SECURITY_PREFIX, 7843 .get = nfs4_xattr_get_nfs4_label, 7844 .set = nfs4_xattr_set_nfs4_label, 7845 }; 7846 7847 #else 7848 7849 static ssize_t 7850 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7851 { 7852 return 0; 7853 } 7854 7855 #endif 7856 7857 #ifdef CONFIG_NFS_V4_2 7858 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7859 struct mnt_idmap *idmap, 7860 struct dentry *unused, struct inode *inode, 7861 const char *key, const void *buf, 7862 size_t buflen, int flags) 7863 { 7864 u32 mask; 7865 int ret; 7866 7867 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7868 return -EOPNOTSUPP; 7869 7870 /* 7871 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7872 * flags right now. Handling of xattr operations use the normal 7873 * file read/write permissions. 7874 * 7875 * Just in case the server has other ideas (which RFC 8276 allows), 7876 * do a cached access check for the XA* flags to possibly avoid 7877 * doing an RPC and getting EACCES back. 7878 */ 7879 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7880 if (!(mask & NFS_ACCESS_XAWRITE)) 7881 return -EACCES; 7882 } 7883 7884 if (buf == NULL) { 7885 ret = nfs42_proc_removexattr(inode, key); 7886 if (!ret) 7887 nfs4_xattr_cache_remove(inode, key); 7888 } else { 7889 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7890 if (!ret) 7891 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7892 } 7893 7894 return ret; 7895 } 7896 7897 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7898 struct dentry *unused, struct inode *inode, 7899 const char *key, void *buf, size_t buflen) 7900 { 7901 u32 mask; 7902 ssize_t ret; 7903 7904 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7905 return -EOPNOTSUPP; 7906 7907 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7908 if (!(mask & NFS_ACCESS_XAREAD)) 7909 return -EACCES; 7910 } 7911 7912 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7913 if (ret) 7914 return ret; 7915 7916 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7917 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7918 return ret; 7919 7920 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7921 7922 return ret; 7923 } 7924 7925 static ssize_t 7926 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7927 { 7928 u64 cookie; 7929 bool eof; 7930 ssize_t ret, size; 7931 char *buf; 7932 size_t buflen; 7933 u32 mask; 7934 7935 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7936 return 0; 7937 7938 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7939 if (!(mask & NFS_ACCESS_XALIST)) 7940 return 0; 7941 } 7942 7943 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7944 if (ret) 7945 return ret; 7946 7947 ret = nfs4_xattr_cache_list(inode, list, list_len); 7948 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7949 return ret; 7950 7951 cookie = 0; 7952 eof = false; 7953 buflen = list_len ? list_len : XATTR_LIST_MAX; 7954 buf = list_len ? list : NULL; 7955 size = 0; 7956 7957 while (!eof) { 7958 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7959 &cookie, &eof); 7960 if (ret < 0) 7961 return ret; 7962 7963 if (list_len) { 7964 buf += ret; 7965 buflen -= ret; 7966 } 7967 size += ret; 7968 } 7969 7970 if (list_len) 7971 nfs4_xattr_cache_set_list(inode, list, size); 7972 7973 return size; 7974 } 7975 7976 #else 7977 7978 static ssize_t 7979 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7980 { 7981 return 0; 7982 } 7983 #endif /* CONFIG_NFS_V4_2 */ 7984 7985 /* 7986 * nfs_fhget will use either the mounted_on_fileid or the fileid 7987 */ 7988 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7989 { 7990 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7991 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7992 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7993 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7994 return; 7995 7996 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7997 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7998 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7999 fattr->nlink = 2; 8000 } 8001 8002 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8003 const struct qstr *name, 8004 struct nfs4_fs_locations *fs_locations, 8005 struct page *page) 8006 { 8007 struct nfs_server *server = NFS_SERVER(dir); 8008 u32 bitmask[3]; 8009 struct nfs4_fs_locations_arg args = { 8010 .dir_fh = NFS_FH(dir), 8011 .name = name, 8012 .page = page, 8013 .bitmask = bitmask, 8014 }; 8015 struct nfs4_fs_locations_res res = { 8016 .fs_locations = fs_locations, 8017 }; 8018 struct rpc_message msg = { 8019 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8020 .rpc_argp = &args, 8021 .rpc_resp = &res, 8022 }; 8023 int status; 8024 8025 dprintk("%s: start\n", __func__); 8026 8027 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8028 bitmask[1] = nfs4_fattr_bitmap[1]; 8029 8030 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8031 * is not supported */ 8032 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8033 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8034 else 8035 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8036 8037 nfs_fattr_init(fs_locations->fattr); 8038 fs_locations->server = server; 8039 fs_locations->nlocations = 0; 8040 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8041 dprintk("%s: returned status = %d\n", __func__, status); 8042 return status; 8043 } 8044 8045 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8046 const struct qstr *name, 8047 struct nfs4_fs_locations *fs_locations, 8048 struct page *page) 8049 { 8050 struct nfs4_exception exception = { 8051 .interruptible = true, 8052 }; 8053 int err; 8054 do { 8055 err = _nfs4_proc_fs_locations(client, dir, name, 8056 fs_locations, page); 8057 trace_nfs4_get_fs_locations(dir, name, err); 8058 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8059 &exception); 8060 } while (exception.retry); 8061 return err; 8062 } 8063 8064 /* 8065 * This operation also signals the server that this client is 8066 * performing migration recovery. The server can stop returning 8067 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8068 * appended to this compound to identify the client ID which is 8069 * performing recovery. 8070 */ 8071 static int _nfs40_proc_get_locations(struct nfs_server *server, 8072 struct nfs_fh *fhandle, 8073 struct nfs4_fs_locations *locations, 8074 struct page *page, const struct cred *cred) 8075 { 8076 struct rpc_clnt *clnt = server->client; 8077 u32 bitmask[2] = { 8078 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8079 }; 8080 struct nfs4_fs_locations_arg args = { 8081 .clientid = server->nfs_client->cl_clientid, 8082 .fh = fhandle, 8083 .page = page, 8084 .bitmask = bitmask, 8085 .migration = 1, /* skip LOOKUP */ 8086 .renew = 1, /* append RENEW */ 8087 }; 8088 struct nfs4_fs_locations_res res = { 8089 .fs_locations = locations, 8090 .migration = 1, 8091 .renew = 1, 8092 }; 8093 struct rpc_message msg = { 8094 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8095 .rpc_argp = &args, 8096 .rpc_resp = &res, 8097 .rpc_cred = cred, 8098 }; 8099 unsigned long now = jiffies; 8100 int status; 8101 8102 nfs_fattr_init(locations->fattr); 8103 locations->server = server; 8104 locations->nlocations = 0; 8105 8106 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8107 status = nfs4_call_sync_sequence(clnt, server, &msg, 8108 &args.seq_args, &res.seq_res); 8109 if (status) 8110 return status; 8111 8112 renew_lease(server, now); 8113 return 0; 8114 } 8115 8116 #ifdef CONFIG_NFS_V4_1 8117 8118 /* 8119 * This operation also signals the server that this client is 8120 * performing migration recovery. The server can stop asserting 8121 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8122 * performing this operation is identified in the SEQUENCE 8123 * operation in this compound. 8124 * 8125 * When the client supports GETATTR(fs_locations_info), it can 8126 * be plumbed in here. 8127 */ 8128 static int _nfs41_proc_get_locations(struct nfs_server *server, 8129 struct nfs_fh *fhandle, 8130 struct nfs4_fs_locations *locations, 8131 struct page *page, const struct cred *cred) 8132 { 8133 struct rpc_clnt *clnt = server->client; 8134 u32 bitmask[2] = { 8135 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8136 }; 8137 struct nfs4_fs_locations_arg args = { 8138 .fh = fhandle, 8139 .page = page, 8140 .bitmask = bitmask, 8141 .migration = 1, /* skip LOOKUP */ 8142 }; 8143 struct nfs4_fs_locations_res res = { 8144 .fs_locations = locations, 8145 .migration = 1, 8146 }; 8147 struct rpc_message msg = { 8148 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8149 .rpc_argp = &args, 8150 .rpc_resp = &res, 8151 .rpc_cred = cred, 8152 }; 8153 struct nfs4_call_sync_data data = { 8154 .seq_server = server, 8155 .seq_args = &args.seq_args, 8156 .seq_res = &res.seq_res, 8157 }; 8158 struct rpc_task_setup task_setup_data = { 8159 .rpc_client = clnt, 8160 .rpc_message = &msg, 8161 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8162 .callback_data = &data, 8163 .flags = RPC_TASK_NO_ROUND_ROBIN, 8164 }; 8165 int status; 8166 8167 nfs_fattr_init(locations->fattr); 8168 locations->server = server; 8169 locations->nlocations = 0; 8170 8171 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8172 status = nfs4_call_sync_custom(&task_setup_data); 8173 if (status == NFS4_OK && 8174 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8175 status = -NFS4ERR_LEASE_MOVED; 8176 return status; 8177 } 8178 8179 #endif /* CONFIG_NFS_V4_1 */ 8180 8181 /** 8182 * nfs4_proc_get_locations - discover locations for a migrated FSID 8183 * @server: pointer to nfs_server to process 8184 * @fhandle: pointer to the kernel NFS client file handle 8185 * @locations: result of query 8186 * @page: buffer 8187 * @cred: credential to use for this operation 8188 * 8189 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8190 * operation failed, or a negative errno if a local error occurred. 8191 * 8192 * On success, "locations" is filled in, but if the server has 8193 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8194 * asserted. 8195 * 8196 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8197 * from this client that require migration recovery. 8198 */ 8199 int nfs4_proc_get_locations(struct nfs_server *server, 8200 struct nfs_fh *fhandle, 8201 struct nfs4_fs_locations *locations, 8202 struct page *page, const struct cred *cred) 8203 { 8204 struct nfs_client *clp = server->nfs_client; 8205 const struct nfs4_mig_recovery_ops *ops = 8206 clp->cl_mvops->mig_recovery_ops; 8207 struct nfs4_exception exception = { 8208 .interruptible = true, 8209 }; 8210 int status; 8211 8212 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8213 (unsigned long long)server->fsid.major, 8214 (unsigned long long)server->fsid.minor, 8215 clp->cl_hostname); 8216 nfs_display_fhandle(fhandle, __func__); 8217 8218 do { 8219 status = ops->get_locations(server, fhandle, locations, page, 8220 cred); 8221 if (status != -NFS4ERR_DELAY) 8222 break; 8223 nfs4_handle_exception(server, status, &exception); 8224 } while (exception.retry); 8225 return status; 8226 } 8227 8228 /* 8229 * This operation also signals the server that this client is 8230 * performing "lease moved" recovery. The server can stop 8231 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8232 * is appended to this compound to identify the client ID which is 8233 * performing recovery. 8234 */ 8235 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8236 { 8237 struct nfs_server *server = NFS_SERVER(inode); 8238 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8239 struct rpc_clnt *clnt = server->client; 8240 struct nfs4_fsid_present_arg args = { 8241 .fh = NFS_FH(inode), 8242 .clientid = clp->cl_clientid, 8243 .renew = 1, /* append RENEW */ 8244 }; 8245 struct nfs4_fsid_present_res res = { 8246 .renew = 1, 8247 }; 8248 struct rpc_message msg = { 8249 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8250 .rpc_argp = &args, 8251 .rpc_resp = &res, 8252 .rpc_cred = cred, 8253 }; 8254 unsigned long now = jiffies; 8255 int status; 8256 8257 res.fh = nfs_alloc_fhandle(); 8258 if (res.fh == NULL) 8259 return -ENOMEM; 8260 8261 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8262 status = nfs4_call_sync_sequence(clnt, server, &msg, 8263 &args.seq_args, &res.seq_res); 8264 nfs_free_fhandle(res.fh); 8265 if (status) 8266 return status; 8267 8268 do_renew_lease(clp, now); 8269 return 0; 8270 } 8271 8272 #ifdef CONFIG_NFS_V4_1 8273 8274 /* 8275 * This operation also signals the server that this client is 8276 * performing "lease moved" recovery. The server can stop asserting 8277 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8278 * this operation is identified in the SEQUENCE operation in this 8279 * compound. 8280 */ 8281 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8282 { 8283 struct nfs_server *server = NFS_SERVER(inode); 8284 struct rpc_clnt *clnt = server->client; 8285 struct nfs4_fsid_present_arg args = { 8286 .fh = NFS_FH(inode), 8287 }; 8288 struct nfs4_fsid_present_res res = { 8289 }; 8290 struct rpc_message msg = { 8291 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8292 .rpc_argp = &args, 8293 .rpc_resp = &res, 8294 .rpc_cred = cred, 8295 }; 8296 int status; 8297 8298 res.fh = nfs_alloc_fhandle(); 8299 if (res.fh == NULL) 8300 return -ENOMEM; 8301 8302 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8303 status = nfs4_call_sync_sequence(clnt, server, &msg, 8304 &args.seq_args, &res.seq_res); 8305 nfs_free_fhandle(res.fh); 8306 if (status == NFS4_OK && 8307 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8308 status = -NFS4ERR_LEASE_MOVED; 8309 return status; 8310 } 8311 8312 #endif /* CONFIG_NFS_V4_1 */ 8313 8314 /** 8315 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8316 * @inode: inode on FSID to check 8317 * @cred: credential to use for this operation 8318 * 8319 * Server indicates whether the FSID is present, moved, or not 8320 * recognized. This operation is necessary to clear a LEASE_MOVED 8321 * condition for this client ID. 8322 * 8323 * Returns NFS4_OK if the FSID is present on this server, 8324 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8325 * NFS4ERR code if some error occurred on the server, or a 8326 * negative errno if a local failure occurred. 8327 */ 8328 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8329 { 8330 struct nfs_server *server = NFS_SERVER(inode); 8331 struct nfs_client *clp = server->nfs_client; 8332 const struct nfs4_mig_recovery_ops *ops = 8333 clp->cl_mvops->mig_recovery_ops; 8334 struct nfs4_exception exception = { 8335 .interruptible = true, 8336 }; 8337 int status; 8338 8339 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8340 (unsigned long long)server->fsid.major, 8341 (unsigned long long)server->fsid.minor, 8342 clp->cl_hostname); 8343 nfs_display_fhandle(NFS_FH(inode), __func__); 8344 8345 do { 8346 status = ops->fsid_present(inode, cred); 8347 if (status != -NFS4ERR_DELAY) 8348 break; 8349 nfs4_handle_exception(server, status, &exception); 8350 } while (exception.retry); 8351 return status; 8352 } 8353 8354 /* 8355 * If 'use_integrity' is true and the state managment nfs_client 8356 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8357 * and the machine credential as per RFC3530bis and RFC5661 Security 8358 * Considerations sections. Otherwise, just use the user cred with the 8359 * filesystem's rpc_client. 8360 */ 8361 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8362 { 8363 int status; 8364 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8365 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8366 struct nfs4_secinfo_arg args = { 8367 .dir_fh = NFS_FH(dir), 8368 .name = name, 8369 }; 8370 struct nfs4_secinfo_res res = { 8371 .flavors = flavors, 8372 }; 8373 struct rpc_message msg = { 8374 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8375 .rpc_argp = &args, 8376 .rpc_resp = &res, 8377 }; 8378 struct nfs4_call_sync_data data = { 8379 .seq_server = NFS_SERVER(dir), 8380 .seq_args = &args.seq_args, 8381 .seq_res = &res.seq_res, 8382 }; 8383 struct rpc_task_setup task_setup = { 8384 .rpc_client = clnt, 8385 .rpc_message = &msg, 8386 .callback_ops = clp->cl_mvops->call_sync_ops, 8387 .callback_data = &data, 8388 .flags = RPC_TASK_NO_ROUND_ROBIN, 8389 }; 8390 const struct cred *cred = NULL; 8391 8392 if (use_integrity) { 8393 clnt = clp->cl_rpcclient; 8394 task_setup.rpc_client = clnt; 8395 8396 cred = nfs4_get_clid_cred(clp); 8397 msg.rpc_cred = cred; 8398 } 8399 8400 dprintk("NFS call secinfo %s\n", name->name); 8401 8402 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8403 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8404 status = nfs4_call_sync_custom(&task_setup); 8405 8406 dprintk("NFS reply secinfo: %d\n", status); 8407 8408 put_cred(cred); 8409 return status; 8410 } 8411 8412 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8413 struct nfs4_secinfo_flavors *flavors) 8414 { 8415 struct nfs4_exception exception = { 8416 .interruptible = true, 8417 }; 8418 int err; 8419 do { 8420 err = -NFS4ERR_WRONGSEC; 8421 8422 /* try to use integrity protection with machine cred */ 8423 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8424 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8425 8426 /* 8427 * if unable to use integrity protection, or SECINFO with 8428 * integrity protection returns NFS4ERR_WRONGSEC (which is 8429 * disallowed by spec, but exists in deployed servers) use 8430 * the current filesystem's rpc_client and the user cred. 8431 */ 8432 if (err == -NFS4ERR_WRONGSEC) 8433 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8434 8435 trace_nfs4_secinfo(dir, name, err); 8436 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8437 &exception); 8438 } while (exception.retry); 8439 return err; 8440 } 8441 8442 #ifdef CONFIG_NFS_V4_1 8443 /* 8444 * Check the exchange flags returned by the server for invalid flags, having 8445 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8446 * DS flags set. 8447 */ 8448 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8449 { 8450 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8451 goto out_inval; 8452 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8453 goto out_inval; 8454 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8455 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8456 goto out_inval; 8457 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8458 goto out_inval; 8459 return NFS_OK; 8460 out_inval: 8461 return -NFS4ERR_INVAL; 8462 } 8463 8464 static bool 8465 nfs41_same_server_scope(struct nfs41_server_scope *a, 8466 struct nfs41_server_scope *b) 8467 { 8468 if (a->server_scope_sz != b->server_scope_sz) 8469 return false; 8470 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8471 } 8472 8473 static void 8474 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8475 { 8476 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8477 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8478 struct nfs_client *clp = args->client; 8479 8480 switch (task->tk_status) { 8481 case -NFS4ERR_BADSESSION: 8482 case -NFS4ERR_DEADSESSION: 8483 nfs4_schedule_session_recovery(clp->cl_session, 8484 task->tk_status); 8485 return; 8486 } 8487 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8488 res->dir != NFS4_CDFS4_BOTH) { 8489 rpc_task_close_connection(task); 8490 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8491 rpc_restart_call(task); 8492 } 8493 } 8494 8495 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8496 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8497 }; 8498 8499 /* 8500 * nfs4_proc_bind_one_conn_to_session() 8501 * 8502 * The 4.1 client currently uses the same TCP connection for the 8503 * fore and backchannel. 8504 */ 8505 static 8506 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8507 struct rpc_xprt *xprt, 8508 struct nfs_client *clp, 8509 const struct cred *cred) 8510 { 8511 int status; 8512 struct nfs41_bind_conn_to_session_args args = { 8513 .client = clp, 8514 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8515 .retries = 0, 8516 }; 8517 struct nfs41_bind_conn_to_session_res res; 8518 struct rpc_message msg = { 8519 .rpc_proc = 8520 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8521 .rpc_argp = &args, 8522 .rpc_resp = &res, 8523 .rpc_cred = cred, 8524 }; 8525 struct rpc_task_setup task_setup_data = { 8526 .rpc_client = clnt, 8527 .rpc_xprt = xprt, 8528 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8529 .rpc_message = &msg, 8530 .flags = RPC_TASK_TIMEOUT, 8531 }; 8532 struct rpc_task *task; 8533 8534 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8535 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8536 args.dir = NFS4_CDFC4_FORE; 8537 8538 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8539 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8540 args.dir = NFS4_CDFC4_FORE; 8541 8542 task = rpc_run_task(&task_setup_data); 8543 if (!IS_ERR(task)) { 8544 status = task->tk_status; 8545 rpc_put_task(task); 8546 } else 8547 status = PTR_ERR(task); 8548 trace_nfs4_bind_conn_to_session(clp, status); 8549 if (status == 0) { 8550 if (memcmp(res.sessionid.data, 8551 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8552 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8553 return -EIO; 8554 } 8555 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8556 dprintk("NFS: %s: Unexpected direction from server\n", 8557 __func__); 8558 return -EIO; 8559 } 8560 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8561 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8562 __func__); 8563 return -EIO; 8564 } 8565 } 8566 8567 return status; 8568 } 8569 8570 struct rpc_bind_conn_calldata { 8571 struct nfs_client *clp; 8572 const struct cred *cred; 8573 }; 8574 8575 static int 8576 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8577 struct rpc_xprt *xprt, 8578 void *calldata) 8579 { 8580 struct rpc_bind_conn_calldata *p = calldata; 8581 8582 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8583 } 8584 8585 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8586 { 8587 struct rpc_bind_conn_calldata data = { 8588 .clp = clp, 8589 .cred = cred, 8590 }; 8591 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8592 nfs4_proc_bind_conn_to_session_callback, &data); 8593 } 8594 8595 /* 8596 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8597 * and operations we'd like to see to enable certain features in the allow map 8598 */ 8599 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8600 .how = SP4_MACH_CRED, 8601 .enforce.u.words = { 8602 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8603 1 << (OP_EXCHANGE_ID - 32) | 8604 1 << (OP_CREATE_SESSION - 32) | 8605 1 << (OP_DESTROY_SESSION - 32) | 8606 1 << (OP_DESTROY_CLIENTID - 32) 8607 }, 8608 .allow.u.words = { 8609 [0] = 1 << (OP_CLOSE) | 8610 1 << (OP_OPEN_DOWNGRADE) | 8611 1 << (OP_LOCKU) | 8612 1 << (OP_DELEGRETURN) | 8613 1 << (OP_COMMIT), 8614 [1] = 1 << (OP_SECINFO - 32) | 8615 1 << (OP_SECINFO_NO_NAME - 32) | 8616 1 << (OP_LAYOUTRETURN - 32) | 8617 1 << (OP_TEST_STATEID - 32) | 8618 1 << (OP_FREE_STATEID - 32) | 8619 1 << (OP_WRITE - 32) 8620 } 8621 }; 8622 8623 /* 8624 * Select the state protection mode for client `clp' given the server results 8625 * from exchange_id in `sp'. 8626 * 8627 * Returns 0 on success, negative errno otherwise. 8628 */ 8629 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8630 struct nfs41_state_protection *sp) 8631 { 8632 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8633 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8634 1 << (OP_EXCHANGE_ID - 32) | 8635 1 << (OP_CREATE_SESSION - 32) | 8636 1 << (OP_DESTROY_SESSION - 32) | 8637 1 << (OP_DESTROY_CLIENTID - 32) 8638 }; 8639 unsigned long flags = 0; 8640 unsigned int i; 8641 int ret = 0; 8642 8643 if (sp->how == SP4_MACH_CRED) { 8644 /* Print state protect result */ 8645 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8646 for (i = 0; i <= LAST_NFS4_OP; i++) { 8647 if (test_bit(i, sp->enforce.u.longs)) 8648 dfprintk(MOUNT, " enforce op %d\n", i); 8649 if (test_bit(i, sp->allow.u.longs)) 8650 dfprintk(MOUNT, " allow op %d\n", i); 8651 } 8652 8653 /* make sure nothing is on enforce list that isn't supported */ 8654 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8655 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8656 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8657 ret = -EINVAL; 8658 goto out; 8659 } 8660 } 8661 8662 /* 8663 * Minimal mode - state operations are allowed to use machine 8664 * credential. Note this already happens by default, so the 8665 * client doesn't have to do anything more than the negotiation. 8666 * 8667 * NOTE: we don't care if EXCHANGE_ID is in the list - 8668 * we're already using the machine cred for exchange_id 8669 * and will never use a different cred. 8670 */ 8671 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8672 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8673 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8674 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8675 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8676 dfprintk(MOUNT, " minimal mode enabled\n"); 8677 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8678 } else { 8679 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8680 ret = -EINVAL; 8681 goto out; 8682 } 8683 8684 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8685 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8686 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8687 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8688 dfprintk(MOUNT, " cleanup mode enabled\n"); 8689 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8690 } 8691 8692 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8693 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8694 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8695 } 8696 8697 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8698 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8699 dfprintk(MOUNT, " secinfo mode enabled\n"); 8700 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8701 } 8702 8703 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8704 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8705 dfprintk(MOUNT, " stateid mode enabled\n"); 8706 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8707 } 8708 8709 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8710 dfprintk(MOUNT, " write mode enabled\n"); 8711 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8712 } 8713 8714 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8715 dfprintk(MOUNT, " commit mode enabled\n"); 8716 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8717 } 8718 } 8719 out: 8720 clp->cl_sp4_flags = flags; 8721 return ret; 8722 } 8723 8724 struct nfs41_exchange_id_data { 8725 struct nfs41_exchange_id_res res; 8726 struct nfs41_exchange_id_args args; 8727 }; 8728 8729 static void nfs4_exchange_id_release(void *data) 8730 { 8731 struct nfs41_exchange_id_data *cdata = 8732 (struct nfs41_exchange_id_data *)data; 8733 8734 nfs_put_client(cdata->args.client); 8735 kfree(cdata->res.impl_id); 8736 kfree(cdata->res.server_scope); 8737 kfree(cdata->res.server_owner); 8738 kfree(cdata); 8739 } 8740 8741 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8742 .rpc_release = nfs4_exchange_id_release, 8743 }; 8744 8745 /* 8746 * _nfs4_proc_exchange_id() 8747 * 8748 * Wrapper for EXCHANGE_ID operation. 8749 */ 8750 static struct rpc_task * 8751 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8752 u32 sp4_how, struct rpc_xprt *xprt) 8753 { 8754 struct rpc_message msg = { 8755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8756 .rpc_cred = cred, 8757 }; 8758 struct rpc_task_setup task_setup_data = { 8759 .rpc_client = clp->cl_rpcclient, 8760 .callback_ops = &nfs4_exchange_id_call_ops, 8761 .rpc_message = &msg, 8762 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8763 }; 8764 struct nfs41_exchange_id_data *calldata; 8765 int status; 8766 8767 if (!refcount_inc_not_zero(&clp->cl_count)) 8768 return ERR_PTR(-EIO); 8769 8770 status = -ENOMEM; 8771 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8772 if (!calldata) 8773 goto out; 8774 8775 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8776 8777 status = nfs4_init_uniform_client_string(clp); 8778 if (status) 8779 goto out_calldata; 8780 8781 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8782 GFP_NOFS); 8783 status = -ENOMEM; 8784 if (unlikely(calldata->res.server_owner == NULL)) 8785 goto out_calldata; 8786 8787 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8788 GFP_NOFS); 8789 if (unlikely(calldata->res.server_scope == NULL)) 8790 goto out_server_owner; 8791 8792 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8793 if (unlikely(calldata->res.impl_id == NULL)) 8794 goto out_server_scope; 8795 8796 switch (sp4_how) { 8797 case SP4_NONE: 8798 calldata->args.state_protect.how = SP4_NONE; 8799 break; 8800 8801 case SP4_MACH_CRED: 8802 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8803 break; 8804 8805 default: 8806 /* unsupported! */ 8807 WARN_ON_ONCE(1); 8808 status = -EINVAL; 8809 goto out_impl_id; 8810 } 8811 if (xprt) { 8812 task_setup_data.rpc_xprt = xprt; 8813 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8814 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8815 sizeof(calldata->args.verifier.data)); 8816 } 8817 calldata->args.client = clp; 8818 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8819 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8820 #ifdef CONFIG_NFS_V4_1_MIGRATION 8821 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8822 #endif 8823 if (test_bit(NFS_CS_DS, &clp->cl_flags)) 8824 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8825 msg.rpc_argp = &calldata->args; 8826 msg.rpc_resp = &calldata->res; 8827 task_setup_data.callback_data = calldata; 8828 8829 return rpc_run_task(&task_setup_data); 8830 8831 out_impl_id: 8832 kfree(calldata->res.impl_id); 8833 out_server_scope: 8834 kfree(calldata->res.server_scope); 8835 out_server_owner: 8836 kfree(calldata->res.server_owner); 8837 out_calldata: 8838 kfree(calldata); 8839 out: 8840 nfs_put_client(clp); 8841 return ERR_PTR(status); 8842 } 8843 8844 /* 8845 * _nfs4_proc_exchange_id() 8846 * 8847 * Wrapper for EXCHANGE_ID operation. 8848 */ 8849 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8850 u32 sp4_how) 8851 { 8852 struct rpc_task *task; 8853 struct nfs41_exchange_id_args *argp; 8854 struct nfs41_exchange_id_res *resp; 8855 unsigned long now = jiffies; 8856 int status; 8857 8858 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8859 if (IS_ERR(task)) 8860 return PTR_ERR(task); 8861 8862 argp = task->tk_msg.rpc_argp; 8863 resp = task->tk_msg.rpc_resp; 8864 status = task->tk_status; 8865 if (status != 0) 8866 goto out; 8867 8868 status = nfs4_check_cl_exchange_flags(resp->flags, 8869 clp->cl_mvops->minor_version); 8870 if (status != 0) 8871 goto out; 8872 8873 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8874 if (status != 0) 8875 goto out; 8876 8877 do_renew_lease(clp, now); 8878 8879 clp->cl_clientid = resp->clientid; 8880 clp->cl_exchange_flags = resp->flags; 8881 clp->cl_seqid = resp->seqid; 8882 /* Client ID is not confirmed */ 8883 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8884 clear_bit(NFS4_SESSION_ESTABLISHED, 8885 &clp->cl_session->session_state); 8886 8887 if (clp->cl_serverscope != NULL && 8888 !nfs41_same_server_scope(clp->cl_serverscope, 8889 resp->server_scope)) { 8890 dprintk("%s: server_scope mismatch detected\n", 8891 __func__); 8892 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8893 } 8894 8895 swap(clp->cl_serverowner, resp->server_owner); 8896 swap(clp->cl_serverscope, resp->server_scope); 8897 swap(clp->cl_implid, resp->impl_id); 8898 8899 /* Save the EXCHANGE_ID verifier session trunk tests */ 8900 memcpy(clp->cl_confirm.data, argp->verifier.data, 8901 sizeof(clp->cl_confirm.data)); 8902 out: 8903 trace_nfs4_exchange_id(clp, status); 8904 rpc_put_task(task); 8905 return status; 8906 } 8907 8908 /* 8909 * nfs4_proc_exchange_id() 8910 * 8911 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8912 * 8913 * Since the clientid has expired, all compounds using sessions 8914 * associated with the stale clientid will be returning 8915 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8916 * be in some phase of session reset. 8917 * 8918 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8919 */ 8920 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8921 { 8922 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8923 int status; 8924 8925 /* try SP4_MACH_CRED if krb5i/p */ 8926 if (authflavor == RPC_AUTH_GSS_KRB5I || 8927 authflavor == RPC_AUTH_GSS_KRB5P) { 8928 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8929 if (!status) 8930 return 0; 8931 } 8932 8933 /* try SP4_NONE */ 8934 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8935 } 8936 8937 /** 8938 * nfs4_test_session_trunk 8939 * 8940 * This is an add_xprt_test() test function called from 8941 * rpc_clnt_setup_test_and_add_xprt. 8942 * 8943 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8944 * and is dereferrenced in nfs4_exchange_id_release 8945 * 8946 * Upon success, add the new transport to the rpc_clnt 8947 * 8948 * @clnt: struct rpc_clnt to get new transport 8949 * @xprt: the rpc_xprt to test 8950 * @data: call data for _nfs4_proc_exchange_id. 8951 */ 8952 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8953 void *data) 8954 { 8955 struct nfs4_add_xprt_data *adata = data; 8956 struct rpc_task *task; 8957 int status; 8958 8959 u32 sp4_how; 8960 8961 dprintk("--> %s try %s\n", __func__, 8962 xprt->address_strings[RPC_DISPLAY_ADDR]); 8963 8964 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8965 8966 try_again: 8967 /* Test connection for session trunking. Async exchange_id call */ 8968 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8969 if (IS_ERR(task)) 8970 return; 8971 8972 status = task->tk_status; 8973 if (status == 0) 8974 status = nfs4_detect_session_trunking(adata->clp, 8975 task->tk_msg.rpc_resp, xprt); 8976 8977 if (status == 0) 8978 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8979 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt, 8980 (struct sockaddr *)&xprt->addr)) 8981 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8982 8983 rpc_put_task(task); 8984 if (status == -NFS4ERR_DELAY) { 8985 ssleep(1); 8986 goto try_again; 8987 } 8988 } 8989 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8990 8991 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8992 const struct cred *cred) 8993 { 8994 struct rpc_message msg = { 8995 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8996 .rpc_argp = clp, 8997 .rpc_cred = cred, 8998 }; 8999 int status; 9000 9001 status = rpc_call_sync(clp->cl_rpcclient, &msg, 9002 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9003 trace_nfs4_destroy_clientid(clp, status); 9004 if (status) 9005 dprintk("NFS: Got error %d from the server %s on " 9006 "DESTROY_CLIENTID.", status, clp->cl_hostname); 9007 return status; 9008 } 9009 9010 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 9011 const struct cred *cred) 9012 { 9013 unsigned int loop; 9014 int ret; 9015 9016 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 9017 ret = _nfs4_proc_destroy_clientid(clp, cred); 9018 switch (ret) { 9019 case -NFS4ERR_DELAY: 9020 case -NFS4ERR_CLIENTID_BUSY: 9021 ssleep(1); 9022 break; 9023 default: 9024 return ret; 9025 } 9026 } 9027 return 0; 9028 } 9029 9030 int nfs4_destroy_clientid(struct nfs_client *clp) 9031 { 9032 const struct cred *cred; 9033 int ret = 0; 9034 9035 if (clp->cl_mvops->minor_version < 1) 9036 goto out; 9037 if (clp->cl_exchange_flags == 0) 9038 goto out; 9039 if (clp->cl_preserve_clid) 9040 goto out; 9041 cred = nfs4_get_clid_cred(clp); 9042 ret = nfs4_proc_destroy_clientid(clp, cred); 9043 put_cred(cred); 9044 switch (ret) { 9045 case 0: 9046 case -NFS4ERR_STALE_CLIENTID: 9047 clp->cl_exchange_flags = 0; 9048 } 9049 out: 9050 return ret; 9051 } 9052 9053 #endif /* CONFIG_NFS_V4_1 */ 9054 9055 struct nfs4_get_lease_time_data { 9056 struct nfs4_get_lease_time_args *args; 9057 struct nfs4_get_lease_time_res *res; 9058 struct nfs_client *clp; 9059 }; 9060 9061 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9062 void *calldata) 9063 { 9064 struct nfs4_get_lease_time_data *data = 9065 (struct nfs4_get_lease_time_data *)calldata; 9066 9067 /* just setup sequence, do not trigger session recovery 9068 since we're invoked within one */ 9069 nfs4_setup_sequence(data->clp, 9070 &data->args->la_seq_args, 9071 &data->res->lr_seq_res, 9072 task); 9073 } 9074 9075 /* 9076 * Called from nfs4_state_manager thread for session setup, so don't recover 9077 * from sequence operation or clientid errors. 9078 */ 9079 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9080 { 9081 struct nfs4_get_lease_time_data *data = 9082 (struct nfs4_get_lease_time_data *)calldata; 9083 9084 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9085 return; 9086 switch (task->tk_status) { 9087 case -NFS4ERR_DELAY: 9088 case -NFS4ERR_GRACE: 9089 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9090 task->tk_status = 0; 9091 fallthrough; 9092 case -NFS4ERR_RETRY_UNCACHED_REP: 9093 rpc_restart_call_prepare(task); 9094 return; 9095 } 9096 } 9097 9098 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9099 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9100 .rpc_call_done = nfs4_get_lease_time_done, 9101 }; 9102 9103 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9104 { 9105 struct nfs4_get_lease_time_args args; 9106 struct nfs4_get_lease_time_res res = { 9107 .lr_fsinfo = fsinfo, 9108 }; 9109 struct nfs4_get_lease_time_data data = { 9110 .args = &args, 9111 .res = &res, 9112 .clp = clp, 9113 }; 9114 struct rpc_message msg = { 9115 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9116 .rpc_argp = &args, 9117 .rpc_resp = &res, 9118 }; 9119 struct rpc_task_setup task_setup = { 9120 .rpc_client = clp->cl_rpcclient, 9121 .rpc_message = &msg, 9122 .callback_ops = &nfs4_get_lease_time_ops, 9123 .callback_data = &data, 9124 .flags = RPC_TASK_TIMEOUT, 9125 }; 9126 9127 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9128 return nfs4_call_sync_custom(&task_setup); 9129 } 9130 9131 #ifdef CONFIG_NFS_V4_1 9132 9133 /* 9134 * Initialize the values to be used by the client in CREATE_SESSION 9135 * If nfs4_init_session set the fore channel request and response sizes, 9136 * use them. 9137 * 9138 * Set the back channel max_resp_sz_cached to zero to force the client to 9139 * always set csa_cachethis to FALSE because the current implementation 9140 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9141 */ 9142 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9143 struct rpc_clnt *clnt) 9144 { 9145 unsigned int max_rqst_sz, max_resp_sz; 9146 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9147 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9148 9149 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9150 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9151 9152 /* Fore channel attributes */ 9153 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9154 args->fc_attrs.max_resp_sz = max_resp_sz; 9155 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9156 args->fc_attrs.max_reqs = max_session_slots; 9157 9158 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9159 "max_ops=%u max_reqs=%u\n", 9160 __func__, 9161 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9162 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9163 9164 /* Back channel attributes */ 9165 args->bc_attrs.max_rqst_sz = max_bc_payload; 9166 args->bc_attrs.max_resp_sz = max_bc_payload; 9167 args->bc_attrs.max_resp_sz_cached = 0; 9168 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9169 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9170 if (args->bc_attrs.max_reqs > max_bc_slots) 9171 args->bc_attrs.max_reqs = max_bc_slots; 9172 9173 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9174 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9175 __func__, 9176 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9177 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9178 args->bc_attrs.max_reqs); 9179 } 9180 9181 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9182 struct nfs41_create_session_res *res) 9183 { 9184 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9185 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9186 9187 if (rcvd->max_resp_sz > sent->max_resp_sz) 9188 return -EINVAL; 9189 /* 9190 * Our requested max_ops is the minimum we need; we're not 9191 * prepared to break up compounds into smaller pieces than that. 9192 * So, no point even trying to continue if the server won't 9193 * cooperate: 9194 */ 9195 if (rcvd->max_ops < sent->max_ops) 9196 return -EINVAL; 9197 if (rcvd->max_reqs == 0) 9198 return -EINVAL; 9199 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9200 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9201 return 0; 9202 } 9203 9204 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9205 struct nfs41_create_session_res *res) 9206 { 9207 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9208 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9209 9210 if (!(res->flags & SESSION4_BACK_CHAN)) 9211 goto out; 9212 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9213 return -EINVAL; 9214 if (rcvd->max_resp_sz < sent->max_resp_sz) 9215 return -EINVAL; 9216 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9217 return -EINVAL; 9218 if (rcvd->max_ops > sent->max_ops) 9219 return -EINVAL; 9220 if (rcvd->max_reqs > sent->max_reqs) 9221 return -EINVAL; 9222 out: 9223 return 0; 9224 } 9225 9226 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9227 struct nfs41_create_session_res *res) 9228 { 9229 int ret; 9230 9231 ret = nfs4_verify_fore_channel_attrs(args, res); 9232 if (ret) 9233 return ret; 9234 return nfs4_verify_back_channel_attrs(args, res); 9235 } 9236 9237 static void nfs4_update_session(struct nfs4_session *session, 9238 struct nfs41_create_session_res *res) 9239 { 9240 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9241 /* Mark client id and session as being confirmed */ 9242 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9243 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9244 session->flags = res->flags; 9245 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9246 if (res->flags & SESSION4_BACK_CHAN) 9247 memcpy(&session->bc_attrs, &res->bc_attrs, 9248 sizeof(session->bc_attrs)); 9249 } 9250 9251 static int _nfs4_proc_create_session(struct nfs_client *clp, 9252 const struct cred *cred) 9253 { 9254 struct nfs4_session *session = clp->cl_session; 9255 struct nfs41_create_session_args args = { 9256 .client = clp, 9257 .clientid = clp->cl_clientid, 9258 .seqid = clp->cl_seqid, 9259 .cb_program = NFS4_CALLBACK, 9260 }; 9261 struct nfs41_create_session_res res; 9262 9263 struct rpc_message msg = { 9264 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9265 .rpc_argp = &args, 9266 .rpc_resp = &res, 9267 .rpc_cred = cred, 9268 }; 9269 int status; 9270 9271 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9272 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9273 9274 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9275 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9276 trace_nfs4_create_session(clp, status); 9277 9278 switch (status) { 9279 case -NFS4ERR_STALE_CLIENTID: 9280 case -NFS4ERR_DELAY: 9281 case -ETIMEDOUT: 9282 case -EACCES: 9283 case -EAGAIN: 9284 goto out; 9285 } 9286 9287 clp->cl_seqid++; 9288 if (!status) { 9289 /* Verify the session's negotiated channel_attrs values */ 9290 status = nfs4_verify_channel_attrs(&args, &res); 9291 /* Increment the clientid slot sequence id */ 9292 if (status) 9293 goto out; 9294 nfs4_update_session(session, &res); 9295 } 9296 out: 9297 return status; 9298 } 9299 9300 /* 9301 * Issues a CREATE_SESSION operation to the server. 9302 * It is the responsibility of the caller to verify the session is 9303 * expired before calling this routine. 9304 */ 9305 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9306 { 9307 int status; 9308 unsigned *ptr; 9309 struct nfs4_session *session = clp->cl_session; 9310 struct nfs4_add_xprt_data xprtdata = { 9311 .clp = clp, 9312 }; 9313 struct rpc_add_xprt_test rpcdata = { 9314 .add_xprt_test = clp->cl_mvops->session_trunk, 9315 .data = &xprtdata, 9316 }; 9317 9318 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9319 9320 status = _nfs4_proc_create_session(clp, cred); 9321 if (status) 9322 goto out; 9323 9324 /* Init or reset the session slot tables */ 9325 status = nfs4_setup_session_slot_tables(session); 9326 dprintk("slot table setup returned %d\n", status); 9327 if (status) 9328 goto out; 9329 9330 ptr = (unsigned *)&session->sess_id.data[0]; 9331 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9332 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9333 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9334 out: 9335 return status; 9336 } 9337 9338 /* 9339 * Issue the over-the-wire RPC DESTROY_SESSION. 9340 * The caller must serialize access to this routine. 9341 */ 9342 int nfs4_proc_destroy_session(struct nfs4_session *session, 9343 const struct cred *cred) 9344 { 9345 struct rpc_message msg = { 9346 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9347 .rpc_argp = session, 9348 .rpc_cred = cred, 9349 }; 9350 int status = 0; 9351 9352 /* session is still being setup */ 9353 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9354 return 0; 9355 9356 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9357 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9358 trace_nfs4_destroy_session(session->clp, status); 9359 9360 if (status) 9361 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9362 "Session has been destroyed regardless...\n", status); 9363 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9364 return status; 9365 } 9366 9367 /* 9368 * Renew the cl_session lease. 9369 */ 9370 struct nfs4_sequence_data { 9371 struct nfs_client *clp; 9372 struct nfs4_sequence_args args; 9373 struct nfs4_sequence_res res; 9374 }; 9375 9376 static void nfs41_sequence_release(void *data) 9377 { 9378 struct nfs4_sequence_data *calldata = data; 9379 struct nfs_client *clp = calldata->clp; 9380 9381 if (refcount_read(&clp->cl_count) > 1) 9382 nfs4_schedule_state_renewal(clp); 9383 nfs_put_client(clp); 9384 kfree(calldata); 9385 } 9386 9387 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9388 { 9389 switch(task->tk_status) { 9390 case -NFS4ERR_DELAY: 9391 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9392 return -EAGAIN; 9393 default: 9394 nfs4_schedule_lease_recovery(clp); 9395 } 9396 return 0; 9397 } 9398 9399 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9400 { 9401 struct nfs4_sequence_data *calldata = data; 9402 struct nfs_client *clp = calldata->clp; 9403 9404 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9405 return; 9406 9407 trace_nfs4_sequence(clp, task->tk_status); 9408 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9409 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9410 if (refcount_read(&clp->cl_count) == 1) 9411 return; 9412 9413 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9414 rpc_restart_call_prepare(task); 9415 return; 9416 } 9417 } 9418 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9419 } 9420 9421 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9422 { 9423 struct nfs4_sequence_data *calldata = data; 9424 struct nfs_client *clp = calldata->clp; 9425 struct nfs4_sequence_args *args; 9426 struct nfs4_sequence_res *res; 9427 9428 args = task->tk_msg.rpc_argp; 9429 res = task->tk_msg.rpc_resp; 9430 9431 nfs4_setup_sequence(clp, args, res, task); 9432 } 9433 9434 static const struct rpc_call_ops nfs41_sequence_ops = { 9435 .rpc_call_done = nfs41_sequence_call_done, 9436 .rpc_call_prepare = nfs41_sequence_prepare, 9437 .rpc_release = nfs41_sequence_release, 9438 }; 9439 9440 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9441 const struct cred *cred, 9442 struct nfs4_slot *slot, 9443 bool is_privileged) 9444 { 9445 struct nfs4_sequence_data *calldata; 9446 struct rpc_message msg = { 9447 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9448 .rpc_cred = cred, 9449 }; 9450 struct rpc_task_setup task_setup_data = { 9451 .rpc_client = clp->cl_rpcclient, 9452 .rpc_message = &msg, 9453 .callback_ops = &nfs41_sequence_ops, 9454 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9455 }; 9456 struct rpc_task *ret; 9457 9458 ret = ERR_PTR(-EIO); 9459 if (!refcount_inc_not_zero(&clp->cl_count)) 9460 goto out_err; 9461 9462 ret = ERR_PTR(-ENOMEM); 9463 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9464 if (calldata == NULL) 9465 goto out_put_clp; 9466 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9467 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9468 msg.rpc_argp = &calldata->args; 9469 msg.rpc_resp = &calldata->res; 9470 calldata->clp = clp; 9471 task_setup_data.callback_data = calldata; 9472 9473 ret = rpc_run_task(&task_setup_data); 9474 if (IS_ERR(ret)) 9475 goto out_err; 9476 return ret; 9477 out_put_clp: 9478 nfs_put_client(clp); 9479 out_err: 9480 nfs41_release_slot(slot); 9481 return ret; 9482 } 9483 9484 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9485 { 9486 struct rpc_task *task; 9487 int ret = 0; 9488 9489 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9490 return -EAGAIN; 9491 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9492 if (IS_ERR(task)) 9493 ret = PTR_ERR(task); 9494 else 9495 rpc_put_task_async(task); 9496 dprintk("<-- %s status=%d\n", __func__, ret); 9497 return ret; 9498 } 9499 9500 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9501 { 9502 struct rpc_task *task; 9503 int ret; 9504 9505 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9506 if (IS_ERR(task)) { 9507 ret = PTR_ERR(task); 9508 goto out; 9509 } 9510 ret = rpc_wait_for_completion_task(task); 9511 if (!ret) 9512 ret = task->tk_status; 9513 rpc_put_task(task); 9514 out: 9515 dprintk("<-- %s status=%d\n", __func__, ret); 9516 return ret; 9517 } 9518 9519 struct nfs4_reclaim_complete_data { 9520 struct nfs_client *clp; 9521 struct nfs41_reclaim_complete_args arg; 9522 struct nfs41_reclaim_complete_res res; 9523 }; 9524 9525 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9526 { 9527 struct nfs4_reclaim_complete_data *calldata = data; 9528 9529 nfs4_setup_sequence(calldata->clp, 9530 &calldata->arg.seq_args, 9531 &calldata->res.seq_res, 9532 task); 9533 } 9534 9535 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9536 { 9537 switch(task->tk_status) { 9538 case 0: 9539 wake_up_all(&clp->cl_lock_waitq); 9540 fallthrough; 9541 case -NFS4ERR_COMPLETE_ALREADY: 9542 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9543 break; 9544 case -NFS4ERR_DELAY: 9545 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9546 fallthrough; 9547 case -NFS4ERR_RETRY_UNCACHED_REP: 9548 case -EACCES: 9549 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9550 __func__, task->tk_status, clp->cl_hostname); 9551 return -EAGAIN; 9552 case -NFS4ERR_BADSESSION: 9553 case -NFS4ERR_DEADSESSION: 9554 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9555 break; 9556 default: 9557 nfs4_schedule_lease_recovery(clp); 9558 } 9559 return 0; 9560 } 9561 9562 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9563 { 9564 struct nfs4_reclaim_complete_data *calldata = data; 9565 struct nfs_client *clp = calldata->clp; 9566 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9567 9568 if (!nfs41_sequence_done(task, res)) 9569 return; 9570 9571 trace_nfs4_reclaim_complete(clp, task->tk_status); 9572 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9573 rpc_restart_call_prepare(task); 9574 return; 9575 } 9576 } 9577 9578 static void nfs4_free_reclaim_complete_data(void *data) 9579 { 9580 struct nfs4_reclaim_complete_data *calldata = data; 9581 9582 kfree(calldata); 9583 } 9584 9585 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9586 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9587 .rpc_call_done = nfs4_reclaim_complete_done, 9588 .rpc_release = nfs4_free_reclaim_complete_data, 9589 }; 9590 9591 /* 9592 * Issue a global reclaim complete. 9593 */ 9594 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9595 const struct cred *cred) 9596 { 9597 struct nfs4_reclaim_complete_data *calldata; 9598 struct rpc_message msg = { 9599 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9600 .rpc_cred = cred, 9601 }; 9602 struct rpc_task_setup task_setup_data = { 9603 .rpc_client = clp->cl_rpcclient, 9604 .rpc_message = &msg, 9605 .callback_ops = &nfs4_reclaim_complete_call_ops, 9606 .flags = RPC_TASK_NO_ROUND_ROBIN, 9607 }; 9608 int status = -ENOMEM; 9609 9610 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9611 if (calldata == NULL) 9612 goto out; 9613 calldata->clp = clp; 9614 calldata->arg.one_fs = 0; 9615 9616 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9617 msg.rpc_argp = &calldata->arg; 9618 msg.rpc_resp = &calldata->res; 9619 task_setup_data.callback_data = calldata; 9620 status = nfs4_call_sync_custom(&task_setup_data); 9621 out: 9622 dprintk("<-- %s status=%d\n", __func__, status); 9623 return status; 9624 } 9625 9626 static void 9627 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9628 { 9629 struct nfs4_layoutget *lgp = calldata; 9630 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9631 9632 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9633 &lgp->res.seq_res, task); 9634 } 9635 9636 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9637 { 9638 struct nfs4_layoutget *lgp = calldata; 9639 9640 nfs41_sequence_process(task, &lgp->res.seq_res); 9641 } 9642 9643 static int 9644 nfs4_layoutget_handle_exception(struct rpc_task *task, 9645 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9646 { 9647 struct inode *inode = lgp->args.inode; 9648 struct nfs_server *server = NFS_SERVER(inode); 9649 struct pnfs_layout_hdr *lo = lgp->lo; 9650 int nfs4err = task->tk_status; 9651 int err, status = 0; 9652 LIST_HEAD(head); 9653 9654 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9655 9656 nfs4_sequence_free_slot(&lgp->res.seq_res); 9657 9658 exception->state = NULL; 9659 exception->stateid = NULL; 9660 9661 switch (nfs4err) { 9662 case 0: 9663 goto out; 9664 9665 /* 9666 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9667 * on the file. set tk_status to -ENODATA to tell upper layer to 9668 * retry go inband. 9669 */ 9670 case -NFS4ERR_LAYOUTUNAVAILABLE: 9671 status = -ENODATA; 9672 goto out; 9673 /* 9674 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9675 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9676 */ 9677 case -NFS4ERR_BADLAYOUT: 9678 status = -EOVERFLOW; 9679 goto out; 9680 /* 9681 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9682 * (or clients) writing to the same RAID stripe except when 9683 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9684 * 9685 * Treat it like we would RECALLCONFLICT -- we retry for a little 9686 * while, and then eventually give up. 9687 */ 9688 case -NFS4ERR_LAYOUTTRYLATER: 9689 if (lgp->args.minlength == 0) { 9690 status = -EOVERFLOW; 9691 goto out; 9692 } 9693 status = -EBUSY; 9694 break; 9695 case -NFS4ERR_RECALLCONFLICT: 9696 case -NFS4ERR_RETURNCONFLICT: 9697 status = -ERECALLCONFLICT; 9698 break; 9699 case -NFS4ERR_DELEG_REVOKED: 9700 case -NFS4ERR_ADMIN_REVOKED: 9701 case -NFS4ERR_EXPIRED: 9702 case -NFS4ERR_BAD_STATEID: 9703 exception->timeout = 0; 9704 spin_lock(&inode->i_lock); 9705 /* If the open stateid was bad, then recover it. */ 9706 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9707 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9708 spin_unlock(&inode->i_lock); 9709 exception->state = lgp->args.ctx->state; 9710 exception->stateid = &lgp->args.stateid; 9711 break; 9712 } 9713 9714 /* 9715 * Mark the bad layout state as invalid, then retry 9716 */ 9717 pnfs_mark_layout_stateid_invalid(lo, &head); 9718 spin_unlock(&inode->i_lock); 9719 nfs_commit_inode(inode, 0); 9720 pnfs_free_lseg_list(&head); 9721 status = -EAGAIN; 9722 goto out; 9723 } 9724 9725 err = nfs4_handle_exception(server, nfs4err, exception); 9726 if (!status) { 9727 if (exception->retry) 9728 status = -EAGAIN; 9729 else 9730 status = err; 9731 } 9732 out: 9733 return status; 9734 } 9735 9736 size_t max_response_pages(struct nfs_server *server) 9737 { 9738 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9739 return nfs_page_array_len(0, max_resp_sz); 9740 } 9741 9742 static void nfs4_layoutget_release(void *calldata) 9743 { 9744 struct nfs4_layoutget *lgp = calldata; 9745 9746 nfs4_sequence_free_slot(&lgp->res.seq_res); 9747 pnfs_layoutget_free(lgp); 9748 } 9749 9750 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9751 .rpc_call_prepare = nfs4_layoutget_prepare, 9752 .rpc_call_done = nfs4_layoutget_done, 9753 .rpc_release = nfs4_layoutget_release, 9754 }; 9755 9756 struct pnfs_layout_segment * 9757 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, 9758 struct nfs4_exception *exception) 9759 { 9760 struct inode *inode = lgp->args.inode; 9761 struct nfs_server *server = NFS_SERVER(inode); 9762 struct rpc_task *task; 9763 struct rpc_message msg = { 9764 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9765 .rpc_argp = &lgp->args, 9766 .rpc_resp = &lgp->res, 9767 .rpc_cred = lgp->cred, 9768 }; 9769 struct rpc_task_setup task_setup_data = { 9770 .rpc_client = server->client, 9771 .rpc_message = &msg, 9772 .callback_ops = &nfs4_layoutget_call_ops, 9773 .callback_data = lgp, 9774 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9775 RPC_TASK_MOVEABLE, 9776 }; 9777 struct pnfs_layout_segment *lseg = NULL; 9778 int status = 0; 9779 9780 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9781 exception->retry = 0; 9782 9783 task = rpc_run_task(&task_setup_data); 9784 if (IS_ERR(task)) 9785 return ERR_CAST(task); 9786 9787 status = rpc_wait_for_completion_task(task); 9788 if (status != 0) 9789 goto out; 9790 9791 if (task->tk_status < 0) { 9792 exception->retry = 1; 9793 status = nfs4_layoutget_handle_exception(task, lgp, exception); 9794 } else if (lgp->res.layoutp->len == 0) { 9795 exception->retry = 1; 9796 status = -EAGAIN; 9797 nfs4_update_delay(&exception->timeout); 9798 } else 9799 lseg = pnfs_layout_process(lgp); 9800 out: 9801 trace_nfs4_layoutget(lgp->args.ctx, 9802 &lgp->args.range, 9803 &lgp->res.range, 9804 &lgp->res.stateid, 9805 status); 9806 9807 rpc_put_task(task); 9808 dprintk("<-- %s status=%d\n", __func__, status); 9809 if (status) 9810 return ERR_PTR(status); 9811 return lseg; 9812 } 9813 9814 static void 9815 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9816 { 9817 struct nfs4_layoutreturn *lrp = calldata; 9818 9819 nfs4_setup_sequence(lrp->clp, 9820 &lrp->args.seq_args, 9821 &lrp->res.seq_res, 9822 task); 9823 if (!pnfs_layout_is_valid(lrp->args.layout)) 9824 rpc_exit(task, 0); 9825 } 9826 9827 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9828 { 9829 struct nfs4_layoutreturn *lrp = calldata; 9830 struct nfs_server *server; 9831 9832 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9833 return; 9834 9835 /* 9836 * Was there an RPC level error? Assume the call succeeded, 9837 * and that we need to release the layout 9838 */ 9839 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9840 lrp->res.lrs_present = 0; 9841 return; 9842 } 9843 9844 server = NFS_SERVER(lrp->args.inode); 9845 switch (task->tk_status) { 9846 case -NFS4ERR_OLD_STATEID: 9847 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9848 &lrp->args.range, 9849 lrp->args.inode)) 9850 goto out_restart; 9851 fallthrough; 9852 default: 9853 task->tk_status = 0; 9854 fallthrough; 9855 case 0: 9856 break; 9857 case -NFS4ERR_DELAY: 9858 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9859 break; 9860 goto out_restart; 9861 } 9862 return; 9863 out_restart: 9864 task->tk_status = 0; 9865 nfs4_sequence_free_slot(&lrp->res.seq_res); 9866 rpc_restart_call_prepare(task); 9867 } 9868 9869 static void nfs4_layoutreturn_release(void *calldata) 9870 { 9871 struct nfs4_layoutreturn *lrp = calldata; 9872 struct pnfs_layout_hdr *lo = lrp->args.layout; 9873 9874 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9875 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9876 nfs4_sequence_free_slot(&lrp->res.seq_res); 9877 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9878 lrp->ld_private.ops->free(&lrp->ld_private); 9879 pnfs_put_layout_hdr(lrp->args.layout); 9880 nfs_iput_and_deactive(lrp->inode); 9881 put_cred(lrp->cred); 9882 kfree(calldata); 9883 } 9884 9885 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9886 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9887 .rpc_call_done = nfs4_layoutreturn_done, 9888 .rpc_release = nfs4_layoutreturn_release, 9889 }; 9890 9891 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9892 { 9893 struct rpc_task *task; 9894 struct rpc_message msg = { 9895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9896 .rpc_argp = &lrp->args, 9897 .rpc_resp = &lrp->res, 9898 .rpc_cred = lrp->cred, 9899 }; 9900 struct rpc_task_setup task_setup_data = { 9901 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9902 .rpc_message = &msg, 9903 .callback_ops = &nfs4_layoutreturn_call_ops, 9904 .callback_data = lrp, 9905 .flags = RPC_TASK_MOVEABLE, 9906 }; 9907 int status = 0; 9908 9909 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9910 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9911 &task_setup_data.rpc_client, &msg); 9912 9913 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9914 if (!sync) { 9915 if (!lrp->inode) { 9916 nfs4_layoutreturn_release(lrp); 9917 return -EAGAIN; 9918 } 9919 task_setup_data.flags |= RPC_TASK_ASYNC; 9920 } 9921 if (!lrp->inode) 9922 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9923 1); 9924 else 9925 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9926 0); 9927 task = rpc_run_task(&task_setup_data); 9928 if (IS_ERR(task)) 9929 return PTR_ERR(task); 9930 if (sync) 9931 status = task->tk_status; 9932 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9933 dprintk("<-- %s status=%d\n", __func__, status); 9934 rpc_put_task(task); 9935 return status; 9936 } 9937 9938 static int 9939 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9940 struct pnfs_device *pdev, 9941 const struct cred *cred) 9942 { 9943 struct nfs4_getdeviceinfo_args args = { 9944 .pdev = pdev, 9945 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9946 NOTIFY_DEVICEID4_DELETE, 9947 }; 9948 struct nfs4_getdeviceinfo_res res = { 9949 .pdev = pdev, 9950 }; 9951 struct rpc_message msg = { 9952 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9953 .rpc_argp = &args, 9954 .rpc_resp = &res, 9955 .rpc_cred = cred, 9956 }; 9957 int status; 9958 9959 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9960 if (res.notification & ~args.notify_types) 9961 dprintk("%s: unsupported notification\n", __func__); 9962 if (res.notification != args.notify_types) 9963 pdev->nocache = 1; 9964 9965 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9966 9967 dprintk("<-- %s status=%d\n", __func__, status); 9968 9969 return status; 9970 } 9971 9972 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9973 struct pnfs_device *pdev, 9974 const struct cred *cred) 9975 { 9976 struct nfs4_exception exception = { }; 9977 int err; 9978 9979 do { 9980 err = nfs4_handle_exception(server, 9981 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9982 &exception); 9983 } while (exception.retry); 9984 return err; 9985 } 9986 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9987 9988 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9989 { 9990 struct nfs4_layoutcommit_data *data = calldata; 9991 struct nfs_server *server = NFS_SERVER(data->args.inode); 9992 9993 nfs4_setup_sequence(server->nfs_client, 9994 &data->args.seq_args, 9995 &data->res.seq_res, 9996 task); 9997 } 9998 9999 static void 10000 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 10001 { 10002 struct nfs4_layoutcommit_data *data = calldata; 10003 struct nfs_server *server = NFS_SERVER(data->args.inode); 10004 10005 if (!nfs41_sequence_done(task, &data->res.seq_res)) 10006 return; 10007 10008 switch (task->tk_status) { /* Just ignore these failures */ 10009 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 10010 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 10011 case -NFS4ERR_BADLAYOUT: /* no layout */ 10012 case -NFS4ERR_GRACE: /* loca_recalim always false */ 10013 task->tk_status = 0; 10014 break; 10015 case 0: 10016 break; 10017 default: 10018 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 10019 rpc_restart_call_prepare(task); 10020 return; 10021 } 10022 } 10023 } 10024 10025 static void nfs4_layoutcommit_release(void *calldata) 10026 { 10027 struct nfs4_layoutcommit_data *data = calldata; 10028 10029 pnfs_cleanup_layoutcommit(data); 10030 nfs_post_op_update_inode_force_wcc(data->args.inode, 10031 data->res.fattr); 10032 put_cred(data->cred); 10033 nfs_iput_and_deactive(data->inode); 10034 kfree(data); 10035 } 10036 10037 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10038 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10039 .rpc_call_done = nfs4_layoutcommit_done, 10040 .rpc_release = nfs4_layoutcommit_release, 10041 }; 10042 10043 int 10044 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10045 { 10046 struct rpc_message msg = { 10047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10048 .rpc_argp = &data->args, 10049 .rpc_resp = &data->res, 10050 .rpc_cred = data->cred, 10051 }; 10052 struct rpc_task_setup task_setup_data = { 10053 .task = &data->task, 10054 .rpc_client = NFS_CLIENT(data->args.inode), 10055 .rpc_message = &msg, 10056 .callback_ops = &nfs4_layoutcommit_ops, 10057 .callback_data = data, 10058 .flags = RPC_TASK_MOVEABLE, 10059 }; 10060 struct rpc_task *task; 10061 int status = 0; 10062 10063 dprintk("NFS: initiating layoutcommit call. sync %d " 10064 "lbw: %llu inode %lu\n", sync, 10065 data->args.lastbytewritten, 10066 data->args.inode->i_ino); 10067 10068 if (!sync) { 10069 data->inode = nfs_igrab_and_active(data->args.inode); 10070 if (data->inode == NULL) { 10071 nfs4_layoutcommit_release(data); 10072 return -EAGAIN; 10073 } 10074 task_setup_data.flags = RPC_TASK_ASYNC; 10075 } 10076 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10077 task = rpc_run_task(&task_setup_data); 10078 if (IS_ERR(task)) 10079 return PTR_ERR(task); 10080 if (sync) 10081 status = task->tk_status; 10082 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10083 dprintk("%s: status %d\n", __func__, status); 10084 rpc_put_task(task); 10085 return status; 10086 } 10087 10088 /* 10089 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10090 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10091 */ 10092 static int 10093 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10094 struct nfs_fsinfo *info, 10095 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10096 { 10097 struct nfs41_secinfo_no_name_args args = { 10098 .style = SECINFO_STYLE_CURRENT_FH, 10099 }; 10100 struct nfs4_secinfo_res res = { 10101 .flavors = flavors, 10102 }; 10103 struct rpc_message msg = { 10104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10105 .rpc_argp = &args, 10106 .rpc_resp = &res, 10107 }; 10108 struct nfs4_call_sync_data data = { 10109 .seq_server = server, 10110 .seq_args = &args.seq_args, 10111 .seq_res = &res.seq_res, 10112 }; 10113 struct rpc_task_setup task_setup = { 10114 .rpc_client = server->client, 10115 .rpc_message = &msg, 10116 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10117 .callback_data = &data, 10118 .flags = RPC_TASK_NO_ROUND_ROBIN, 10119 }; 10120 const struct cred *cred = NULL; 10121 int status; 10122 10123 if (use_integrity) { 10124 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10125 10126 cred = nfs4_get_clid_cred(server->nfs_client); 10127 msg.rpc_cred = cred; 10128 } 10129 10130 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10131 status = nfs4_call_sync_custom(&task_setup); 10132 dprintk("<-- %s status=%d\n", __func__, status); 10133 10134 put_cred(cred); 10135 10136 return status; 10137 } 10138 10139 static int 10140 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10141 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10142 { 10143 struct nfs4_exception exception = { 10144 .interruptible = true, 10145 }; 10146 int err; 10147 do { 10148 /* first try using integrity protection */ 10149 err = -NFS4ERR_WRONGSEC; 10150 10151 /* try to use integrity protection with machine cred */ 10152 if (_nfs4_is_integrity_protected(server->nfs_client)) 10153 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10154 flavors, true); 10155 10156 /* 10157 * if unable to use integrity protection, or SECINFO with 10158 * integrity protection returns NFS4ERR_WRONGSEC (which is 10159 * disallowed by spec, but exists in deployed servers) use 10160 * the current filesystem's rpc_client and the user cred. 10161 */ 10162 if (err == -NFS4ERR_WRONGSEC) 10163 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10164 flavors, false); 10165 10166 switch (err) { 10167 case 0: 10168 case -NFS4ERR_WRONGSEC: 10169 case -ENOTSUPP: 10170 goto out; 10171 default: 10172 err = nfs4_handle_exception(server, err, &exception); 10173 } 10174 } while (exception.retry); 10175 out: 10176 return err; 10177 } 10178 10179 static int 10180 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10181 struct nfs_fsinfo *info) 10182 { 10183 int err; 10184 struct page *page; 10185 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10186 struct nfs4_secinfo_flavors *flavors; 10187 struct nfs4_secinfo4 *secinfo; 10188 int i; 10189 10190 page = alloc_page(GFP_KERNEL); 10191 if (!page) { 10192 err = -ENOMEM; 10193 goto out; 10194 } 10195 10196 flavors = page_address(page); 10197 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10198 10199 /* 10200 * Fall back on "guess and check" method if 10201 * the server doesn't support SECINFO_NO_NAME 10202 */ 10203 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10204 err = nfs4_find_root_sec(server, fhandle, info); 10205 goto out_freepage; 10206 } 10207 if (err) 10208 goto out_freepage; 10209 10210 for (i = 0; i < flavors->num_flavors; i++) { 10211 secinfo = &flavors->flavors[i]; 10212 10213 switch (secinfo->flavor) { 10214 case RPC_AUTH_NULL: 10215 case RPC_AUTH_UNIX: 10216 case RPC_AUTH_GSS: 10217 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10218 &secinfo->flavor_info); 10219 break; 10220 default: 10221 flavor = RPC_AUTH_MAXFLAVOR; 10222 break; 10223 } 10224 10225 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10226 flavor = RPC_AUTH_MAXFLAVOR; 10227 10228 if (flavor != RPC_AUTH_MAXFLAVOR) { 10229 err = nfs4_lookup_root_sec(server, fhandle, 10230 info, flavor); 10231 if (!err) 10232 break; 10233 } 10234 } 10235 10236 if (flavor == RPC_AUTH_MAXFLAVOR) 10237 err = -EPERM; 10238 10239 out_freepage: 10240 put_page(page); 10241 if (err == -EACCES) 10242 return -EPERM; 10243 out: 10244 return err; 10245 } 10246 10247 static int _nfs41_test_stateid(struct nfs_server *server, 10248 nfs4_stateid *stateid, 10249 const struct cred *cred) 10250 { 10251 int status; 10252 struct nfs41_test_stateid_args args = { 10253 .stateid = stateid, 10254 }; 10255 struct nfs41_test_stateid_res res; 10256 struct rpc_message msg = { 10257 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10258 .rpc_argp = &args, 10259 .rpc_resp = &res, 10260 .rpc_cred = cred, 10261 }; 10262 struct rpc_clnt *rpc_client = server->client; 10263 10264 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10265 &rpc_client, &msg); 10266 10267 dprintk("NFS call test_stateid %p\n", stateid); 10268 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10269 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10270 &args.seq_args, &res.seq_res); 10271 if (status != NFS_OK) { 10272 dprintk("NFS reply test_stateid: failed, %d\n", status); 10273 return status; 10274 } 10275 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10276 return -res.status; 10277 } 10278 10279 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10280 int err, struct nfs4_exception *exception) 10281 { 10282 exception->retry = 0; 10283 switch(err) { 10284 case -NFS4ERR_DELAY: 10285 case -NFS4ERR_RETRY_UNCACHED_REP: 10286 nfs4_handle_exception(server, err, exception); 10287 break; 10288 case -NFS4ERR_BADSESSION: 10289 case -NFS4ERR_BADSLOT: 10290 case -NFS4ERR_BAD_HIGH_SLOT: 10291 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10292 case -NFS4ERR_DEADSESSION: 10293 nfs4_do_handle_exception(server, err, exception); 10294 } 10295 } 10296 10297 /** 10298 * nfs41_test_stateid - perform a TEST_STATEID operation 10299 * 10300 * @server: server / transport on which to perform the operation 10301 * @stateid: state ID to test 10302 * @cred: credential 10303 * 10304 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10305 * Otherwise a negative NFS4ERR value is returned if the operation 10306 * failed or the state ID is not currently valid. 10307 */ 10308 static int nfs41_test_stateid(struct nfs_server *server, 10309 nfs4_stateid *stateid, 10310 const struct cred *cred) 10311 { 10312 struct nfs4_exception exception = { 10313 .interruptible = true, 10314 }; 10315 int err; 10316 do { 10317 err = _nfs41_test_stateid(server, stateid, cred); 10318 nfs4_handle_delay_or_session_error(server, err, &exception); 10319 } while (exception.retry); 10320 return err; 10321 } 10322 10323 struct nfs_free_stateid_data { 10324 struct nfs_server *server; 10325 struct nfs41_free_stateid_args args; 10326 struct nfs41_free_stateid_res res; 10327 }; 10328 10329 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10330 { 10331 struct nfs_free_stateid_data *data = calldata; 10332 nfs4_setup_sequence(data->server->nfs_client, 10333 &data->args.seq_args, 10334 &data->res.seq_res, 10335 task); 10336 } 10337 10338 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10339 { 10340 struct nfs_free_stateid_data *data = calldata; 10341 10342 nfs41_sequence_done(task, &data->res.seq_res); 10343 10344 switch (task->tk_status) { 10345 case -NFS4ERR_DELAY: 10346 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10347 rpc_restart_call_prepare(task); 10348 } 10349 } 10350 10351 static void nfs41_free_stateid_release(void *calldata) 10352 { 10353 struct nfs_free_stateid_data *data = calldata; 10354 struct nfs_client *clp = data->server->nfs_client; 10355 10356 nfs_put_client(clp); 10357 kfree(calldata); 10358 } 10359 10360 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10361 .rpc_call_prepare = nfs41_free_stateid_prepare, 10362 .rpc_call_done = nfs41_free_stateid_done, 10363 .rpc_release = nfs41_free_stateid_release, 10364 }; 10365 10366 /** 10367 * nfs41_free_stateid - perform a FREE_STATEID operation 10368 * 10369 * @server: server / transport on which to perform the operation 10370 * @stateid: state ID to release 10371 * @cred: credential 10372 * @privileged: set to true if this call needs to be privileged 10373 * 10374 * Note: this function is always asynchronous. 10375 */ 10376 static int nfs41_free_stateid(struct nfs_server *server, 10377 const nfs4_stateid *stateid, 10378 const struct cred *cred, 10379 bool privileged) 10380 { 10381 struct rpc_message msg = { 10382 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10383 .rpc_cred = cred, 10384 }; 10385 struct rpc_task_setup task_setup = { 10386 .rpc_client = server->client, 10387 .rpc_message = &msg, 10388 .callback_ops = &nfs41_free_stateid_ops, 10389 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10390 }; 10391 struct nfs_free_stateid_data *data; 10392 struct rpc_task *task; 10393 struct nfs_client *clp = server->nfs_client; 10394 10395 if (!refcount_inc_not_zero(&clp->cl_count)) 10396 return -EIO; 10397 10398 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10399 &task_setup.rpc_client, &msg); 10400 10401 dprintk("NFS call free_stateid %p\n", stateid); 10402 data = kmalloc(sizeof(*data), GFP_KERNEL); 10403 if (!data) 10404 return -ENOMEM; 10405 data->server = server; 10406 nfs4_stateid_copy(&data->args.stateid, stateid); 10407 10408 task_setup.callback_data = data; 10409 10410 msg.rpc_argp = &data->args; 10411 msg.rpc_resp = &data->res; 10412 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10413 task = rpc_run_task(&task_setup); 10414 if (IS_ERR(task)) 10415 return PTR_ERR(task); 10416 rpc_put_task(task); 10417 return 0; 10418 } 10419 10420 static void 10421 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10422 { 10423 const struct cred *cred = lsp->ls_state->owner->so_cred; 10424 10425 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10426 nfs4_free_lock_state(server, lsp); 10427 } 10428 10429 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10430 const nfs4_stateid *s2) 10431 { 10432 if (s1->type != s2->type) 10433 return false; 10434 10435 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10436 return false; 10437 10438 if (s1->seqid == s2->seqid) 10439 return true; 10440 10441 return s1->seqid == 0 || s2->seqid == 0; 10442 } 10443 10444 #endif /* CONFIG_NFS_V4_1 */ 10445 10446 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10447 const nfs4_stateid *s2) 10448 { 10449 return nfs4_stateid_match(s1, s2); 10450 } 10451 10452 10453 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10454 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10455 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10456 .recover_open = nfs4_open_reclaim, 10457 .recover_lock = nfs4_lock_reclaim, 10458 .establish_clid = nfs4_init_clientid, 10459 .detect_trunking = nfs40_discover_server_trunking, 10460 }; 10461 10462 #if defined(CONFIG_NFS_V4_1) 10463 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10464 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10465 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10466 .recover_open = nfs4_open_reclaim, 10467 .recover_lock = nfs4_lock_reclaim, 10468 .establish_clid = nfs41_init_clientid, 10469 .reclaim_complete = nfs41_proc_reclaim_complete, 10470 .detect_trunking = nfs41_discover_server_trunking, 10471 }; 10472 #endif /* CONFIG_NFS_V4_1 */ 10473 10474 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10475 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10476 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10477 .recover_open = nfs40_open_expired, 10478 .recover_lock = nfs4_lock_expired, 10479 .establish_clid = nfs4_init_clientid, 10480 }; 10481 10482 #if defined(CONFIG_NFS_V4_1) 10483 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10484 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10485 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10486 .recover_open = nfs41_open_expired, 10487 .recover_lock = nfs41_lock_expired, 10488 .establish_clid = nfs41_init_clientid, 10489 }; 10490 #endif /* CONFIG_NFS_V4_1 */ 10491 10492 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10493 .sched_state_renewal = nfs4_proc_async_renew, 10494 .get_state_renewal_cred = nfs4_get_renew_cred, 10495 .renew_lease = nfs4_proc_renew, 10496 }; 10497 10498 #if defined(CONFIG_NFS_V4_1) 10499 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10500 .sched_state_renewal = nfs41_proc_async_sequence, 10501 .get_state_renewal_cred = nfs4_get_machine_cred, 10502 .renew_lease = nfs4_proc_sequence, 10503 }; 10504 #endif 10505 10506 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10507 .get_locations = _nfs40_proc_get_locations, 10508 .fsid_present = _nfs40_proc_fsid_present, 10509 }; 10510 10511 #if defined(CONFIG_NFS_V4_1) 10512 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10513 .get_locations = _nfs41_proc_get_locations, 10514 .fsid_present = _nfs41_proc_fsid_present, 10515 }; 10516 #endif /* CONFIG_NFS_V4_1 */ 10517 10518 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10519 .minor_version = 0, 10520 .init_caps = NFS_CAP_READDIRPLUS 10521 | NFS_CAP_ATOMIC_OPEN 10522 | NFS_CAP_POSIX_LOCK, 10523 .init_client = nfs40_init_client, 10524 .shutdown_client = nfs40_shutdown_client, 10525 .match_stateid = nfs4_match_stateid, 10526 .find_root_sec = nfs4_find_root_sec, 10527 .free_lock_state = nfs4_release_lockowner, 10528 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10529 .alloc_seqid = nfs_alloc_seqid, 10530 .call_sync_ops = &nfs40_call_sync_ops, 10531 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10532 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10533 .state_renewal_ops = &nfs40_state_renewal_ops, 10534 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10535 }; 10536 10537 #if defined(CONFIG_NFS_V4_1) 10538 static struct nfs_seqid * 10539 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10540 { 10541 return NULL; 10542 } 10543 10544 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10545 .minor_version = 1, 10546 .init_caps = NFS_CAP_READDIRPLUS 10547 | NFS_CAP_ATOMIC_OPEN 10548 | NFS_CAP_POSIX_LOCK 10549 | NFS_CAP_STATEID_NFSV41 10550 | NFS_CAP_ATOMIC_OPEN_V1 10551 | NFS_CAP_LGOPEN 10552 | NFS_CAP_MOVEABLE, 10553 .init_client = nfs41_init_client, 10554 .shutdown_client = nfs41_shutdown_client, 10555 .match_stateid = nfs41_match_stateid, 10556 .find_root_sec = nfs41_find_root_sec, 10557 .free_lock_state = nfs41_free_lock_state, 10558 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10559 .alloc_seqid = nfs_alloc_no_seqid, 10560 .session_trunk = nfs4_test_session_trunk, 10561 .call_sync_ops = &nfs41_call_sync_ops, 10562 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10563 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10564 .state_renewal_ops = &nfs41_state_renewal_ops, 10565 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10566 }; 10567 #endif 10568 10569 #if defined(CONFIG_NFS_V4_2) 10570 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10571 .minor_version = 2, 10572 .init_caps = NFS_CAP_READDIRPLUS 10573 | NFS_CAP_ATOMIC_OPEN 10574 | NFS_CAP_POSIX_LOCK 10575 | NFS_CAP_STATEID_NFSV41 10576 | NFS_CAP_ATOMIC_OPEN_V1 10577 | NFS_CAP_LGOPEN 10578 | NFS_CAP_ALLOCATE 10579 | NFS_CAP_COPY 10580 | NFS_CAP_OFFLOAD_CANCEL 10581 | NFS_CAP_COPY_NOTIFY 10582 | NFS_CAP_DEALLOCATE 10583 | NFS_CAP_SEEK 10584 | NFS_CAP_LAYOUTSTATS 10585 | NFS_CAP_CLONE 10586 | NFS_CAP_LAYOUTERROR 10587 | NFS_CAP_READ_PLUS 10588 | NFS_CAP_MOVEABLE, 10589 .init_client = nfs41_init_client, 10590 .shutdown_client = nfs41_shutdown_client, 10591 .match_stateid = nfs41_match_stateid, 10592 .find_root_sec = nfs41_find_root_sec, 10593 .free_lock_state = nfs41_free_lock_state, 10594 .call_sync_ops = &nfs41_call_sync_ops, 10595 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10596 .alloc_seqid = nfs_alloc_no_seqid, 10597 .session_trunk = nfs4_test_session_trunk, 10598 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10599 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10600 .state_renewal_ops = &nfs41_state_renewal_ops, 10601 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10602 }; 10603 #endif 10604 10605 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10606 [0] = &nfs_v4_0_minor_ops, 10607 #if defined(CONFIG_NFS_V4_1) 10608 [1] = &nfs_v4_1_minor_ops, 10609 #endif 10610 #if defined(CONFIG_NFS_V4_2) 10611 [2] = &nfs_v4_2_minor_ops, 10612 #endif 10613 }; 10614 10615 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10616 { 10617 ssize_t error, error2, error3; 10618 10619 error = generic_listxattr(dentry, list, size); 10620 if (error < 0) 10621 return error; 10622 if (list) { 10623 list += error; 10624 size -= error; 10625 } 10626 10627 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10628 if (error2 < 0) 10629 return error2; 10630 10631 if (list) { 10632 list += error2; 10633 size -= error2; 10634 } 10635 10636 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10637 if (error3 < 0) 10638 return error3; 10639 10640 return error + error2 + error3; 10641 } 10642 10643 static void nfs4_enable_swap(struct inode *inode) 10644 { 10645 /* The state manager thread must always be running. 10646 * It will notice the client is a swapper, and stay put. 10647 */ 10648 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10649 10650 nfs4_schedule_state_manager(clp); 10651 } 10652 10653 static void nfs4_disable_swap(struct inode *inode) 10654 { 10655 /* The state manager thread will now exit once it is 10656 * woken. 10657 */ 10658 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10659 10660 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10661 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10662 wake_up_var(&clp->cl_state); 10663 } 10664 10665 static const struct inode_operations nfs4_dir_inode_operations = { 10666 .create = nfs_create, 10667 .lookup = nfs_lookup, 10668 .atomic_open = nfs_atomic_open, 10669 .link = nfs_link, 10670 .unlink = nfs_unlink, 10671 .symlink = nfs_symlink, 10672 .mkdir = nfs_mkdir, 10673 .rmdir = nfs_rmdir, 10674 .mknod = nfs_mknod, 10675 .rename = nfs_rename, 10676 .permission = nfs_permission, 10677 .getattr = nfs_getattr, 10678 .setattr = nfs_setattr, 10679 .listxattr = nfs4_listxattr, 10680 }; 10681 10682 static const struct inode_operations nfs4_file_inode_operations = { 10683 .permission = nfs_permission, 10684 .getattr = nfs_getattr, 10685 .setattr = nfs_setattr, 10686 .listxattr = nfs4_listxattr, 10687 }; 10688 10689 const struct nfs_rpc_ops nfs_v4_clientops = { 10690 .version = 4, /* protocol version */ 10691 .dentry_ops = &nfs4_dentry_operations, 10692 .dir_inode_ops = &nfs4_dir_inode_operations, 10693 .file_inode_ops = &nfs4_file_inode_operations, 10694 .file_ops = &nfs4_file_operations, 10695 .getroot = nfs4_proc_get_root, 10696 .submount = nfs4_submount, 10697 .try_get_tree = nfs4_try_get_tree, 10698 .getattr = nfs4_proc_getattr, 10699 .setattr = nfs4_proc_setattr, 10700 .lookup = nfs4_proc_lookup, 10701 .lookupp = nfs4_proc_lookupp, 10702 .access = nfs4_proc_access, 10703 .readlink = nfs4_proc_readlink, 10704 .create = nfs4_proc_create, 10705 .remove = nfs4_proc_remove, 10706 .unlink_setup = nfs4_proc_unlink_setup, 10707 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10708 .unlink_done = nfs4_proc_unlink_done, 10709 .rename_setup = nfs4_proc_rename_setup, 10710 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10711 .rename_done = nfs4_proc_rename_done, 10712 .link = nfs4_proc_link, 10713 .symlink = nfs4_proc_symlink, 10714 .mkdir = nfs4_proc_mkdir, 10715 .rmdir = nfs4_proc_rmdir, 10716 .readdir = nfs4_proc_readdir, 10717 .mknod = nfs4_proc_mknod, 10718 .statfs = nfs4_proc_statfs, 10719 .fsinfo = nfs4_proc_fsinfo, 10720 .pathconf = nfs4_proc_pathconf, 10721 .set_capabilities = nfs4_server_capabilities, 10722 .decode_dirent = nfs4_decode_dirent, 10723 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10724 .read_setup = nfs4_proc_read_setup, 10725 .read_done = nfs4_read_done, 10726 .write_setup = nfs4_proc_write_setup, 10727 .write_done = nfs4_write_done, 10728 .commit_setup = nfs4_proc_commit_setup, 10729 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10730 .commit_done = nfs4_commit_done, 10731 .lock = nfs4_proc_lock, 10732 .clear_acl_cache = nfs4_zap_acl_attr, 10733 .close_context = nfs4_close_context, 10734 .open_context = nfs4_atomic_open, 10735 .have_delegation = nfs4_have_delegation, 10736 .alloc_client = nfs4_alloc_client, 10737 .init_client = nfs4_init_client, 10738 .free_client = nfs4_free_client, 10739 .create_server = nfs4_create_server, 10740 .clone_server = nfs_clone_server, 10741 .discover_trunking = nfs4_discover_trunking, 10742 .enable_swap = nfs4_enable_swap, 10743 .disable_swap = nfs4_disable_swap, 10744 }; 10745 10746 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10747 .name = XATTR_NAME_NFSV4_ACL, 10748 .list = nfs4_xattr_list_nfs4_acl, 10749 .get = nfs4_xattr_get_nfs4_acl, 10750 .set = nfs4_xattr_set_nfs4_acl, 10751 }; 10752 10753 #if defined(CONFIG_NFS_V4_1) 10754 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10755 .name = XATTR_NAME_NFSV4_DACL, 10756 .list = nfs4_xattr_list_nfs4_dacl, 10757 .get = nfs4_xattr_get_nfs4_dacl, 10758 .set = nfs4_xattr_set_nfs4_dacl, 10759 }; 10760 10761 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10762 .name = XATTR_NAME_NFSV4_SACL, 10763 .list = nfs4_xattr_list_nfs4_sacl, 10764 .get = nfs4_xattr_get_nfs4_sacl, 10765 .set = nfs4_xattr_set_nfs4_sacl, 10766 }; 10767 #endif 10768 10769 #ifdef CONFIG_NFS_V4_2 10770 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10771 .prefix = XATTR_USER_PREFIX, 10772 .get = nfs4_xattr_get_nfs4_user, 10773 .set = nfs4_xattr_set_nfs4_user, 10774 }; 10775 #endif 10776 10777 const struct xattr_handler * const nfs4_xattr_handlers[] = { 10778 &nfs4_xattr_nfs4_acl_handler, 10779 #if defined(CONFIG_NFS_V4_1) 10780 &nfs4_xattr_nfs4_dacl_handler, 10781 &nfs4_xattr_nfs4_sacl_handler, 10782 #endif 10783 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10784 &nfs4_xattr_nfs4_label_handler, 10785 #endif 10786 #ifdef CONFIG_NFS_V4_2 10787 &nfs4_xattr_nfs4_user_handler, 10788 #endif 10789 NULL 10790 }; 10791