1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "sysfs.h" 67 #include "nfs4idmap.h" 68 #include "nfs4session.h" 69 #include "fscache.h" 70 #include "nfs42.h" 71 72 #include "nfs4trace.h" 73 74 #define NFSDBG_FACILITY NFSDBG_PROC 75 76 #define NFS4_BITMASK_SZ 3 77 78 #define NFS4_POLL_RETRY_MIN (HZ/10) 79 #define NFS4_POLL_RETRY_MAX (15*HZ) 80 81 /* file attributes which can be mapped to nfs attributes */ 82 #define NFS4_VALID_ATTRS (ATTR_MODE \ 83 | ATTR_UID \ 84 | ATTR_GID \ 85 | ATTR_SIZE \ 86 | ATTR_ATIME \ 87 | ATTR_MTIME \ 88 | ATTR_CTIME \ 89 | ATTR_ATIME_SET \ 90 | ATTR_MTIME_SET) 91 92 struct nfs4_opendata; 93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 97 struct nfs_fattr *fattr, struct inode *inode); 98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 99 struct nfs_fattr *fattr, struct iattr *sattr, 100 struct nfs_open_context *ctx, struct nfs4_label *ilabel); 101 #ifdef CONFIG_NFS_V4_1 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 103 const struct cred *cred, 104 struct nfs4_slot *slot, 105 bool is_privileged); 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 107 const struct cred *); 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 109 const struct cred *, bool); 110 #endif 111 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 113 static inline struct nfs4_label * 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 115 struct iattr *sattr, struct nfs4_label *label) 116 { 117 int err; 118 119 if (label == NULL) 120 return NULL; 121 122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 123 return NULL; 124 125 label->lfs = 0; 126 label->pi = 0; 127 label->len = 0; 128 label->label = NULL; 129 130 err = security_dentry_init_security(dentry, sattr->ia_mode, 131 &dentry->d_name, NULL, 132 (void **)&label->label, &label->len); 133 if (err == 0) 134 return label; 135 136 return NULL; 137 } 138 static inline void 139 nfs4_label_release_security(struct nfs4_label *label) 140 { 141 if (label) 142 security_release_secctx(label->label, label->len); 143 } 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 145 { 146 if (label) 147 return server->attr_bitmask; 148 149 return server->attr_bitmask_nl; 150 } 151 #else 152 static inline struct nfs4_label * 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 154 struct iattr *sattr, struct nfs4_label *l) 155 { return NULL; } 156 static inline void 157 nfs4_label_release_security(struct nfs4_label *label) 158 { return; } 159 static inline u32 * 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 161 { return server->attr_bitmask; } 162 #endif 163 164 /* Prevent leaks of NFSv4 errors into userland */ 165 static int nfs4_map_errors(int err) 166 { 167 if (err >= -1000) 168 return err; 169 switch (err) { 170 case -NFS4ERR_RESOURCE: 171 case -NFS4ERR_LAYOUTTRYLATER: 172 case -NFS4ERR_RECALLCONFLICT: 173 return -EREMOTEIO; 174 case -NFS4ERR_WRONGSEC: 175 case -NFS4ERR_WRONG_CRED: 176 return -EPERM; 177 case -NFS4ERR_BADOWNER: 178 case -NFS4ERR_BADNAME: 179 return -EINVAL; 180 case -NFS4ERR_SHARE_DENIED: 181 return -EACCES; 182 case -NFS4ERR_MINOR_VERS_MISMATCH: 183 return -EPROTONOSUPPORT; 184 case -NFS4ERR_FILE_OPEN: 185 return -EBUSY; 186 case -NFS4ERR_NOT_SAME: 187 return -ENOTSYNC; 188 default: 189 dprintk("%s could not handle NFSv4 error %d\n", 190 __func__, -err); 191 break; 192 } 193 return -EIO; 194 } 195 196 /* 197 * This is our standard bitmap for GETATTR requests. 198 */ 199 const u32 nfs4_fattr_bitmap[3] = { 200 FATTR4_WORD0_TYPE 201 | FATTR4_WORD0_CHANGE 202 | FATTR4_WORD0_SIZE 203 | FATTR4_WORD0_FSID 204 | FATTR4_WORD0_FILEID, 205 FATTR4_WORD1_MODE 206 | FATTR4_WORD1_NUMLINKS 207 | FATTR4_WORD1_OWNER 208 | FATTR4_WORD1_OWNER_GROUP 209 | FATTR4_WORD1_RAWDEV 210 | FATTR4_WORD1_SPACE_USED 211 | FATTR4_WORD1_TIME_ACCESS 212 | FATTR4_WORD1_TIME_METADATA 213 | FATTR4_WORD1_TIME_MODIFY 214 | FATTR4_WORD1_MOUNTED_ON_FILEID, 215 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 216 FATTR4_WORD2_SECURITY_LABEL 217 #endif 218 }; 219 220 static const u32 nfs4_pnfs_open_bitmap[3] = { 221 FATTR4_WORD0_TYPE 222 | FATTR4_WORD0_CHANGE 223 | FATTR4_WORD0_SIZE 224 | FATTR4_WORD0_FSID 225 | FATTR4_WORD0_FILEID, 226 FATTR4_WORD1_MODE 227 | FATTR4_WORD1_NUMLINKS 228 | FATTR4_WORD1_OWNER 229 | FATTR4_WORD1_OWNER_GROUP 230 | FATTR4_WORD1_RAWDEV 231 | FATTR4_WORD1_SPACE_USED 232 | FATTR4_WORD1_TIME_ACCESS 233 | FATTR4_WORD1_TIME_METADATA 234 | FATTR4_WORD1_TIME_MODIFY, 235 FATTR4_WORD2_MDSTHRESHOLD 236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 237 | FATTR4_WORD2_SECURITY_LABEL 238 #endif 239 }; 240 241 static const u32 nfs4_open_noattr_bitmap[3] = { 242 FATTR4_WORD0_TYPE 243 | FATTR4_WORD0_FILEID, 244 }; 245 246 const u32 nfs4_statfs_bitmap[3] = { 247 FATTR4_WORD0_FILES_AVAIL 248 | FATTR4_WORD0_FILES_FREE 249 | FATTR4_WORD0_FILES_TOTAL, 250 FATTR4_WORD1_SPACE_AVAIL 251 | FATTR4_WORD1_SPACE_FREE 252 | FATTR4_WORD1_SPACE_TOTAL 253 }; 254 255 const u32 nfs4_pathconf_bitmap[3] = { 256 FATTR4_WORD0_MAXLINK 257 | FATTR4_WORD0_MAXNAME, 258 0 259 }; 260 261 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 262 | FATTR4_WORD0_MAXREAD 263 | FATTR4_WORD0_MAXWRITE 264 | FATTR4_WORD0_LEASE_TIME, 265 FATTR4_WORD1_TIME_DELTA 266 | FATTR4_WORD1_FS_LAYOUT_TYPES, 267 FATTR4_WORD2_LAYOUT_BLKSIZE 268 | FATTR4_WORD2_CLONE_BLKSIZE 269 | FATTR4_WORD2_CHANGE_ATTR_TYPE 270 | FATTR4_WORD2_XATTR_SUPPORT 271 }; 272 273 const u32 nfs4_fs_locations_bitmap[3] = { 274 FATTR4_WORD0_CHANGE 275 | FATTR4_WORD0_SIZE 276 | FATTR4_WORD0_FSID 277 | FATTR4_WORD0_FILEID 278 | FATTR4_WORD0_FS_LOCATIONS, 279 FATTR4_WORD1_OWNER 280 | FATTR4_WORD1_OWNER_GROUP 281 | FATTR4_WORD1_RAWDEV 282 | FATTR4_WORD1_SPACE_USED 283 | FATTR4_WORD1_TIME_ACCESS 284 | FATTR4_WORD1_TIME_METADATA 285 | FATTR4_WORD1_TIME_MODIFY 286 | FATTR4_WORD1_MOUNTED_ON_FILEID, 287 }; 288 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 290 struct inode *inode, unsigned long flags) 291 { 292 unsigned long cache_validity; 293 294 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 295 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 296 return; 297 298 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 299 300 /* Remove the attributes over which we have full control */ 301 dst[1] &= ~FATTR4_WORD1_RAWDEV; 302 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 303 dst[0] &= ~FATTR4_WORD0_SIZE; 304 305 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 306 dst[0] &= ~FATTR4_WORD0_CHANGE; 307 308 if (!(cache_validity & NFS_INO_INVALID_MODE)) 309 dst[1] &= ~FATTR4_WORD1_MODE; 310 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 311 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 312 } 313 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 315 struct nfs4_readdir_arg *readdir) 316 { 317 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 318 __be32 *start, *p; 319 320 if (cookie > 2) { 321 readdir->cookie = cookie; 322 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 323 return; 324 } 325 326 readdir->cookie = 0; 327 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 328 if (cookie == 2) 329 return; 330 331 /* 332 * NFSv4 servers do not return entries for '.' and '..' 333 * Therefore, we fake these entries here. We let '.' 334 * have cookie 0 and '..' have cookie 1. Note that 335 * when talking to the server, we always send cookie 0 336 * instead of 1 or 2. 337 */ 338 start = p = kmap_atomic(*readdir->pages); 339 340 if (cookie == 0) { 341 *p++ = xdr_one; /* next */ 342 *p++ = xdr_zero; /* cookie, first word */ 343 *p++ = xdr_one; /* cookie, second word */ 344 *p++ = xdr_one; /* entry len */ 345 memcpy(p, ".\0\0\0", 4); /* entry */ 346 p++; 347 *p++ = xdr_one; /* bitmap length */ 348 *p++ = htonl(attrs); /* bitmap */ 349 *p++ = htonl(12); /* attribute buffer length */ 350 *p++ = htonl(NF4DIR); 351 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 352 } 353 354 *p++ = xdr_one; /* next */ 355 *p++ = xdr_zero; /* cookie, first word */ 356 *p++ = xdr_two; /* cookie, second word */ 357 *p++ = xdr_two; /* entry len */ 358 memcpy(p, "..\0\0", 4); /* entry */ 359 p++; 360 *p++ = xdr_one; /* bitmap length */ 361 *p++ = htonl(attrs); /* bitmap */ 362 *p++ = htonl(12); /* attribute buffer length */ 363 *p++ = htonl(NF4DIR); 364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 365 366 readdir->pgbase = (char *)p - (char *)start; 367 readdir->count -= readdir->pgbase; 368 kunmap_atomic(start); 369 } 370 371 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 372 { 373 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 374 fattr->pre_change_attr = version; 375 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 376 } 377 } 378 379 static void nfs4_test_and_free_stateid(struct nfs_server *server, 380 nfs4_stateid *stateid, 381 const struct cred *cred) 382 { 383 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 384 385 ops->test_and_free_expired(server, stateid, cred); 386 } 387 388 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 389 nfs4_stateid *stateid, 390 const struct cred *cred) 391 { 392 stateid->type = NFS4_REVOKED_STATEID_TYPE; 393 nfs4_test_and_free_stateid(server, stateid, cred); 394 } 395 396 static void nfs4_free_revoked_stateid(struct nfs_server *server, 397 const nfs4_stateid *stateid, 398 const struct cred *cred) 399 { 400 nfs4_stateid tmp; 401 402 nfs4_stateid_copy(&tmp, stateid); 403 __nfs4_free_revoked_stateid(server, &tmp, cred); 404 } 405 406 static long nfs4_update_delay(long *timeout) 407 { 408 long ret; 409 if (!timeout) 410 return NFS4_POLL_RETRY_MAX; 411 if (*timeout <= 0) 412 *timeout = NFS4_POLL_RETRY_MIN; 413 if (*timeout > NFS4_POLL_RETRY_MAX) 414 *timeout = NFS4_POLL_RETRY_MAX; 415 ret = *timeout; 416 *timeout <<= 1; 417 return ret; 418 } 419 420 static int nfs4_delay_killable(long *timeout) 421 { 422 might_sleep(); 423 424 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 425 schedule_timeout(nfs4_update_delay(timeout)); 426 if (!__fatal_signal_pending(current)) 427 return 0; 428 return -EINTR; 429 } 430 431 static int nfs4_delay_interruptible(long *timeout) 432 { 433 might_sleep(); 434 435 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 436 schedule_timeout(nfs4_update_delay(timeout)); 437 if (!signal_pending(current)) 438 return 0; 439 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 440 } 441 442 static int nfs4_delay(long *timeout, bool interruptible) 443 { 444 if (interruptible) 445 return nfs4_delay_interruptible(timeout); 446 return nfs4_delay_killable(timeout); 447 } 448 449 static const nfs4_stateid * 450 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 451 { 452 if (!stateid) 453 return NULL; 454 switch (stateid->type) { 455 case NFS4_OPEN_STATEID_TYPE: 456 case NFS4_LOCK_STATEID_TYPE: 457 case NFS4_DELEGATION_STATEID_TYPE: 458 return stateid; 459 default: 460 break; 461 } 462 return NULL; 463 } 464 465 /* This is the error handling routine for processes that are allowed 466 * to sleep. 467 */ 468 static int nfs4_do_handle_exception(struct nfs_server *server, 469 int errorcode, struct nfs4_exception *exception) 470 { 471 struct nfs_client *clp = server->nfs_client; 472 struct nfs4_state *state = exception->state; 473 const nfs4_stateid *stateid; 474 struct inode *inode = exception->inode; 475 int ret = errorcode; 476 477 exception->delay = 0; 478 exception->recovering = 0; 479 exception->retry = 0; 480 481 stateid = nfs4_recoverable_stateid(exception->stateid); 482 if (stateid == NULL && state != NULL) 483 stateid = nfs4_recoverable_stateid(&state->stateid); 484 485 switch(errorcode) { 486 case 0: 487 return 0; 488 case -NFS4ERR_BADHANDLE: 489 case -ESTALE: 490 if (inode != NULL && S_ISREG(inode->i_mode)) 491 pnfs_destroy_layout(NFS_I(inode)); 492 break; 493 case -NFS4ERR_DELEG_REVOKED: 494 case -NFS4ERR_ADMIN_REVOKED: 495 case -NFS4ERR_EXPIRED: 496 case -NFS4ERR_BAD_STATEID: 497 case -NFS4ERR_PARTNER_NO_AUTH: 498 if (inode != NULL && stateid != NULL) { 499 nfs_inode_find_state_and_recover(inode, 500 stateid); 501 goto wait_on_recovery; 502 } 503 fallthrough; 504 case -NFS4ERR_OPENMODE: 505 if (inode) { 506 int err; 507 508 err = nfs_async_inode_return_delegation(inode, 509 stateid); 510 if (err == 0) 511 goto wait_on_recovery; 512 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 513 exception->retry = 1; 514 break; 515 } 516 } 517 if (state == NULL) 518 break; 519 ret = nfs4_schedule_stateid_recovery(server, state); 520 if (ret < 0) 521 break; 522 goto wait_on_recovery; 523 case -NFS4ERR_STALE_STATEID: 524 case -NFS4ERR_STALE_CLIENTID: 525 nfs4_schedule_lease_recovery(clp); 526 goto wait_on_recovery; 527 case -NFS4ERR_MOVED: 528 ret = nfs4_schedule_migration_recovery(server); 529 if (ret < 0) 530 break; 531 goto wait_on_recovery; 532 case -NFS4ERR_LEASE_MOVED: 533 nfs4_schedule_lease_moved_recovery(clp); 534 goto wait_on_recovery; 535 #if defined(CONFIG_NFS_V4_1) 536 case -NFS4ERR_BADSESSION: 537 case -NFS4ERR_BADSLOT: 538 case -NFS4ERR_BAD_HIGH_SLOT: 539 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 540 case -NFS4ERR_DEADSESSION: 541 case -NFS4ERR_SEQ_FALSE_RETRY: 542 case -NFS4ERR_SEQ_MISORDERED: 543 /* Handled in nfs41_sequence_process() */ 544 goto wait_on_recovery; 545 #endif /* defined(CONFIG_NFS_V4_1) */ 546 case -NFS4ERR_FILE_OPEN: 547 if (exception->timeout > HZ) { 548 /* We have retried a decent amount, time to 549 * fail 550 */ 551 ret = -EBUSY; 552 break; 553 } 554 fallthrough; 555 case -NFS4ERR_DELAY: 556 nfs_inc_server_stats(server, NFSIOS_DELAY); 557 fallthrough; 558 case -NFS4ERR_GRACE: 559 case -NFS4ERR_LAYOUTTRYLATER: 560 case -NFS4ERR_RECALLCONFLICT: 561 exception->delay = 1; 562 return 0; 563 564 case -NFS4ERR_RETRY_UNCACHED_REP: 565 case -NFS4ERR_OLD_STATEID: 566 exception->retry = 1; 567 break; 568 case -NFS4ERR_BADOWNER: 569 /* The following works around a Linux server bug! */ 570 case -NFS4ERR_BADNAME: 571 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 572 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 573 exception->retry = 1; 574 printk(KERN_WARNING "NFS: v4 server %s " 575 "does not accept raw " 576 "uid/gids. " 577 "Reenabling the idmapper.\n", 578 server->nfs_client->cl_hostname); 579 } 580 } 581 /* We failed to handle the error */ 582 return nfs4_map_errors(ret); 583 wait_on_recovery: 584 exception->recovering = 1; 585 return 0; 586 } 587 588 /* This is the error handling routine for processes that are allowed 589 * to sleep. 590 */ 591 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 592 { 593 struct nfs_client *clp = server->nfs_client; 594 int ret; 595 596 ret = nfs4_do_handle_exception(server, errorcode, exception); 597 if (exception->delay) { 598 ret = nfs4_delay(&exception->timeout, 599 exception->interruptible); 600 goto out_retry; 601 } 602 if (exception->recovering) { 603 if (exception->task_is_privileged) 604 return -EDEADLOCK; 605 ret = nfs4_wait_clnt_recover(clp); 606 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 607 return -EIO; 608 goto out_retry; 609 } 610 return ret; 611 out_retry: 612 if (ret == 0) 613 exception->retry = 1; 614 return ret; 615 } 616 617 static int 618 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 619 int errorcode, struct nfs4_exception *exception) 620 { 621 struct nfs_client *clp = server->nfs_client; 622 int ret; 623 624 ret = nfs4_do_handle_exception(server, errorcode, exception); 625 if (exception->delay) { 626 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 627 goto out_retry; 628 } 629 if (exception->recovering) { 630 if (exception->task_is_privileged) 631 return -EDEADLOCK; 632 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 633 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 634 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 635 goto out_retry; 636 } 637 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 638 ret = -EIO; 639 return ret; 640 out_retry: 641 if (ret == 0) { 642 exception->retry = 1; 643 /* 644 * For NFS4ERR_MOVED, the client transport will need to 645 * be recomputed after migration recovery has completed. 646 */ 647 if (errorcode == -NFS4ERR_MOVED) 648 rpc_task_release_transport(task); 649 } 650 return ret; 651 } 652 653 int 654 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 655 struct nfs4_state *state, long *timeout) 656 { 657 struct nfs4_exception exception = { 658 .state = state, 659 }; 660 661 if (task->tk_status >= 0) 662 return 0; 663 if (timeout) 664 exception.timeout = *timeout; 665 task->tk_status = nfs4_async_handle_exception(task, server, 666 task->tk_status, 667 &exception); 668 if (exception.delay && timeout) 669 *timeout = exception.timeout; 670 if (exception.retry) 671 return -EAGAIN; 672 return 0; 673 } 674 675 /* 676 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 677 * or 'false' otherwise. 678 */ 679 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 680 { 681 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 682 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 683 } 684 685 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 686 { 687 spin_lock(&clp->cl_lock); 688 if (time_before(clp->cl_last_renewal,timestamp)) 689 clp->cl_last_renewal = timestamp; 690 spin_unlock(&clp->cl_lock); 691 } 692 693 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 694 { 695 struct nfs_client *clp = server->nfs_client; 696 697 if (!nfs4_has_session(clp)) 698 do_renew_lease(clp, timestamp); 699 } 700 701 struct nfs4_call_sync_data { 702 const struct nfs_server *seq_server; 703 struct nfs4_sequence_args *seq_args; 704 struct nfs4_sequence_res *seq_res; 705 }; 706 707 void nfs4_init_sequence(struct nfs4_sequence_args *args, 708 struct nfs4_sequence_res *res, int cache_reply, 709 int privileged) 710 { 711 args->sa_slot = NULL; 712 args->sa_cache_this = cache_reply; 713 args->sa_privileged = privileged; 714 715 res->sr_slot = NULL; 716 } 717 718 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 719 { 720 struct nfs4_slot *slot = res->sr_slot; 721 struct nfs4_slot_table *tbl; 722 723 tbl = slot->table; 724 spin_lock(&tbl->slot_tbl_lock); 725 if (!nfs41_wake_and_assign_slot(tbl, slot)) 726 nfs4_free_slot(tbl, slot); 727 spin_unlock(&tbl->slot_tbl_lock); 728 729 res->sr_slot = NULL; 730 } 731 732 static int nfs40_sequence_done(struct rpc_task *task, 733 struct nfs4_sequence_res *res) 734 { 735 if (res->sr_slot != NULL) 736 nfs40_sequence_free_slot(res); 737 return 1; 738 } 739 740 #if defined(CONFIG_NFS_V4_1) 741 742 static void nfs41_release_slot(struct nfs4_slot *slot) 743 { 744 struct nfs4_session *session; 745 struct nfs4_slot_table *tbl; 746 bool send_new_highest_used_slotid = false; 747 748 if (!slot) 749 return; 750 tbl = slot->table; 751 session = tbl->session; 752 753 /* Bump the slot sequence number */ 754 if (slot->seq_done) 755 slot->seq_nr++; 756 slot->seq_done = 0; 757 758 spin_lock(&tbl->slot_tbl_lock); 759 /* Be nice to the server: try to ensure that the last transmitted 760 * value for highest_user_slotid <= target_highest_slotid 761 */ 762 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 763 send_new_highest_used_slotid = true; 764 765 if (nfs41_wake_and_assign_slot(tbl, slot)) { 766 send_new_highest_used_slotid = false; 767 goto out_unlock; 768 } 769 nfs4_free_slot(tbl, slot); 770 771 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 772 send_new_highest_used_slotid = false; 773 out_unlock: 774 spin_unlock(&tbl->slot_tbl_lock); 775 if (send_new_highest_used_slotid) 776 nfs41_notify_server(session->clp); 777 if (waitqueue_active(&tbl->slot_waitq)) 778 wake_up_all(&tbl->slot_waitq); 779 } 780 781 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 782 { 783 nfs41_release_slot(res->sr_slot); 784 res->sr_slot = NULL; 785 } 786 787 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 788 u32 seqnr) 789 { 790 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 791 slot->seq_nr_highest_sent = seqnr; 792 } 793 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 794 { 795 nfs4_slot_sequence_record_sent(slot, seqnr); 796 slot->seq_nr_last_acked = seqnr; 797 } 798 799 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 800 struct nfs4_slot *slot) 801 { 802 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 803 if (!IS_ERR(task)) 804 rpc_put_task_async(task); 805 } 806 807 static int nfs41_sequence_process(struct rpc_task *task, 808 struct nfs4_sequence_res *res) 809 { 810 struct nfs4_session *session; 811 struct nfs4_slot *slot = res->sr_slot; 812 struct nfs_client *clp; 813 int status; 814 int ret = 1; 815 816 if (slot == NULL) 817 goto out_noaction; 818 /* don't increment the sequence number if the task wasn't sent */ 819 if (!RPC_WAS_SENT(task) || slot->seq_done) 820 goto out; 821 822 session = slot->table->session; 823 clp = session->clp; 824 825 trace_nfs4_sequence_done(session, res); 826 827 status = res->sr_status; 828 if (task->tk_status == -NFS4ERR_DEADSESSION) 829 status = -NFS4ERR_DEADSESSION; 830 831 /* Check the SEQUENCE operation status */ 832 switch (status) { 833 case 0: 834 /* Mark this sequence number as having been acked */ 835 nfs4_slot_sequence_acked(slot, slot->seq_nr); 836 /* Update the slot's sequence and clientid lease timer */ 837 slot->seq_done = 1; 838 do_renew_lease(clp, res->sr_timestamp); 839 /* Check sequence flags */ 840 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 841 !!slot->privileged); 842 nfs41_update_target_slotid(slot->table, slot, res); 843 break; 844 case 1: 845 /* 846 * sr_status remains 1 if an RPC level error occurred. 847 * The server may or may not have processed the sequence 848 * operation.. 849 */ 850 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 851 slot->seq_done = 1; 852 goto out; 853 case -NFS4ERR_DELAY: 854 /* The server detected a resend of the RPC call and 855 * returned NFS4ERR_DELAY as per Section 2.10.6.2 856 * of RFC5661. 857 */ 858 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 859 __func__, 860 slot->slot_nr, 861 slot->seq_nr); 862 goto out_retry; 863 case -NFS4ERR_RETRY_UNCACHED_REP: 864 case -NFS4ERR_SEQ_FALSE_RETRY: 865 /* 866 * The server thinks we tried to replay a request. 867 * Retry the call after bumping the sequence ID. 868 */ 869 nfs4_slot_sequence_acked(slot, slot->seq_nr); 870 goto retry_new_seq; 871 case -NFS4ERR_BADSLOT: 872 /* 873 * The slot id we used was probably retired. Try again 874 * using a different slot id. 875 */ 876 if (slot->slot_nr < slot->table->target_highest_slotid) 877 goto session_recover; 878 goto retry_nowait; 879 case -NFS4ERR_SEQ_MISORDERED: 880 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 881 /* 882 * Were one or more calls using this slot interrupted? 883 * If the server never received the request, then our 884 * transmitted slot sequence number may be too high. However, 885 * if the server did receive the request then it might 886 * accidentally give us a reply with a mismatched operation. 887 * We can sort this out by sending a lone sequence operation 888 * to the server on the same slot. 889 */ 890 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 891 slot->seq_nr--; 892 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 893 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 894 res->sr_slot = NULL; 895 } 896 goto retry_nowait; 897 } 898 /* 899 * RFC5661: 900 * A retry might be sent while the original request is 901 * still in progress on the replier. The replier SHOULD 902 * deal with the issue by returning NFS4ERR_DELAY as the 903 * reply to SEQUENCE or CB_SEQUENCE operation, but 904 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 905 * 906 * Restart the search after a delay. 907 */ 908 slot->seq_nr = slot->seq_nr_highest_sent; 909 goto out_retry; 910 case -NFS4ERR_BADSESSION: 911 case -NFS4ERR_DEADSESSION: 912 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 913 goto session_recover; 914 default: 915 /* Just update the slot sequence no. */ 916 slot->seq_done = 1; 917 } 918 out: 919 /* The session may be reset by one of the error handlers. */ 920 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 921 out_noaction: 922 return ret; 923 session_recover: 924 nfs4_schedule_session_recovery(session, status); 925 dprintk("%s ERROR: %d Reset session\n", __func__, status); 926 nfs41_sequence_free_slot(res); 927 goto out; 928 retry_new_seq: 929 ++slot->seq_nr; 930 retry_nowait: 931 if (rpc_restart_call_prepare(task)) { 932 nfs41_sequence_free_slot(res); 933 task->tk_status = 0; 934 ret = 0; 935 } 936 goto out; 937 out_retry: 938 if (!rpc_restart_call(task)) 939 goto out; 940 rpc_delay(task, NFS4_POLL_RETRY_MAX); 941 return 0; 942 } 943 944 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 945 { 946 if (!nfs41_sequence_process(task, res)) 947 return 0; 948 if (res->sr_slot != NULL) 949 nfs41_sequence_free_slot(res); 950 return 1; 951 952 } 953 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 954 955 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 956 { 957 if (res->sr_slot == NULL) 958 return 1; 959 if (res->sr_slot->table->session != NULL) 960 return nfs41_sequence_process(task, res); 961 return nfs40_sequence_done(task, res); 962 } 963 964 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 965 { 966 if (res->sr_slot != NULL) { 967 if (res->sr_slot->table->session != NULL) 968 nfs41_sequence_free_slot(res); 969 else 970 nfs40_sequence_free_slot(res); 971 } 972 } 973 974 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 975 { 976 if (res->sr_slot == NULL) 977 return 1; 978 if (!res->sr_slot->table->session) 979 return nfs40_sequence_done(task, res); 980 return nfs41_sequence_done(task, res); 981 } 982 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 983 984 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 985 { 986 struct nfs4_call_sync_data *data = calldata; 987 988 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 989 990 nfs4_setup_sequence(data->seq_server->nfs_client, 991 data->seq_args, data->seq_res, task); 992 } 993 994 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 995 { 996 struct nfs4_call_sync_data *data = calldata; 997 998 nfs41_sequence_done(task, data->seq_res); 999 } 1000 1001 static const struct rpc_call_ops nfs41_call_sync_ops = { 1002 .rpc_call_prepare = nfs41_call_sync_prepare, 1003 .rpc_call_done = nfs41_call_sync_done, 1004 }; 1005 1006 #else /* !CONFIG_NFS_V4_1 */ 1007 1008 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1009 { 1010 return nfs40_sequence_done(task, res); 1011 } 1012 1013 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1014 { 1015 if (res->sr_slot != NULL) 1016 nfs40_sequence_free_slot(res); 1017 } 1018 1019 int nfs4_sequence_done(struct rpc_task *task, 1020 struct nfs4_sequence_res *res) 1021 { 1022 return nfs40_sequence_done(task, res); 1023 } 1024 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1025 1026 #endif /* !CONFIG_NFS_V4_1 */ 1027 1028 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1029 { 1030 res->sr_timestamp = jiffies; 1031 res->sr_status_flags = 0; 1032 res->sr_status = 1; 1033 } 1034 1035 static 1036 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1037 struct nfs4_sequence_res *res, 1038 struct nfs4_slot *slot) 1039 { 1040 if (!slot) 1041 return; 1042 slot->privileged = args->sa_privileged ? 1 : 0; 1043 args->sa_slot = slot; 1044 1045 res->sr_slot = slot; 1046 } 1047 1048 int nfs4_setup_sequence(struct nfs_client *client, 1049 struct nfs4_sequence_args *args, 1050 struct nfs4_sequence_res *res, 1051 struct rpc_task *task) 1052 { 1053 struct nfs4_session *session = nfs4_get_session(client); 1054 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1055 struct nfs4_slot *slot; 1056 1057 /* slot already allocated? */ 1058 if (res->sr_slot != NULL) 1059 goto out_start; 1060 1061 if (session) 1062 tbl = &session->fc_slot_table; 1063 1064 spin_lock(&tbl->slot_tbl_lock); 1065 /* The state manager will wait until the slot table is empty */ 1066 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1067 goto out_sleep; 1068 1069 slot = nfs4_alloc_slot(tbl); 1070 if (IS_ERR(slot)) { 1071 if (slot == ERR_PTR(-ENOMEM)) 1072 goto out_sleep_timeout; 1073 goto out_sleep; 1074 } 1075 spin_unlock(&tbl->slot_tbl_lock); 1076 1077 nfs4_sequence_attach_slot(args, res, slot); 1078 1079 trace_nfs4_setup_sequence(session, args); 1080 out_start: 1081 nfs41_sequence_res_init(res); 1082 rpc_call_start(task); 1083 return 0; 1084 out_sleep_timeout: 1085 /* Try again in 1/4 second */ 1086 if (args->sa_privileged) 1087 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1088 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1089 else 1090 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1091 NULL, jiffies + (HZ >> 2)); 1092 spin_unlock(&tbl->slot_tbl_lock); 1093 return -EAGAIN; 1094 out_sleep: 1095 if (args->sa_privileged) 1096 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1097 RPC_PRIORITY_PRIVILEGED); 1098 else 1099 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1100 spin_unlock(&tbl->slot_tbl_lock); 1101 return -EAGAIN; 1102 } 1103 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1104 1105 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1106 { 1107 struct nfs4_call_sync_data *data = calldata; 1108 nfs4_setup_sequence(data->seq_server->nfs_client, 1109 data->seq_args, data->seq_res, task); 1110 } 1111 1112 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1113 { 1114 struct nfs4_call_sync_data *data = calldata; 1115 nfs4_sequence_done(task, data->seq_res); 1116 } 1117 1118 static const struct rpc_call_ops nfs40_call_sync_ops = { 1119 .rpc_call_prepare = nfs40_call_sync_prepare, 1120 .rpc_call_done = nfs40_call_sync_done, 1121 }; 1122 1123 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1124 { 1125 int ret; 1126 struct rpc_task *task; 1127 1128 task = rpc_run_task(task_setup); 1129 if (IS_ERR(task)) 1130 return PTR_ERR(task); 1131 1132 ret = task->tk_status; 1133 rpc_put_task(task); 1134 return ret; 1135 } 1136 1137 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1138 struct nfs_server *server, 1139 struct rpc_message *msg, 1140 struct nfs4_sequence_args *args, 1141 struct nfs4_sequence_res *res, 1142 unsigned short task_flags) 1143 { 1144 struct nfs_client *clp = server->nfs_client; 1145 struct nfs4_call_sync_data data = { 1146 .seq_server = server, 1147 .seq_args = args, 1148 .seq_res = res, 1149 }; 1150 struct rpc_task_setup task_setup = { 1151 .rpc_client = clnt, 1152 .rpc_message = msg, 1153 .callback_ops = clp->cl_mvops->call_sync_ops, 1154 .callback_data = &data, 1155 .flags = task_flags, 1156 }; 1157 1158 return nfs4_call_sync_custom(&task_setup); 1159 } 1160 1161 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1162 struct nfs_server *server, 1163 struct rpc_message *msg, 1164 struct nfs4_sequence_args *args, 1165 struct nfs4_sequence_res *res) 1166 { 1167 unsigned short task_flags = 0; 1168 1169 if (server->caps & NFS_CAP_MOVEABLE) 1170 task_flags = RPC_TASK_MOVEABLE; 1171 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1172 } 1173 1174 1175 int nfs4_call_sync(struct rpc_clnt *clnt, 1176 struct nfs_server *server, 1177 struct rpc_message *msg, 1178 struct nfs4_sequence_args *args, 1179 struct nfs4_sequence_res *res, 1180 int cache_reply) 1181 { 1182 nfs4_init_sequence(args, res, cache_reply, 0); 1183 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1184 } 1185 1186 static void 1187 nfs4_inc_nlink_locked(struct inode *inode) 1188 { 1189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1190 NFS_INO_INVALID_CTIME | 1191 NFS_INO_INVALID_NLINK); 1192 inc_nlink(inode); 1193 } 1194 1195 static void 1196 nfs4_inc_nlink(struct inode *inode) 1197 { 1198 spin_lock(&inode->i_lock); 1199 nfs4_inc_nlink_locked(inode); 1200 spin_unlock(&inode->i_lock); 1201 } 1202 1203 static void 1204 nfs4_dec_nlink_locked(struct inode *inode) 1205 { 1206 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1207 NFS_INO_INVALID_CTIME | 1208 NFS_INO_INVALID_NLINK); 1209 drop_nlink(inode); 1210 } 1211 1212 static void 1213 nfs4_update_changeattr_locked(struct inode *inode, 1214 struct nfs4_change_info *cinfo, 1215 unsigned long timestamp, unsigned long cache_validity) 1216 { 1217 struct nfs_inode *nfsi = NFS_I(inode); 1218 u64 change_attr = inode_peek_iversion_raw(inode); 1219 1220 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1221 if (S_ISDIR(inode->i_mode)) 1222 cache_validity |= NFS_INO_INVALID_DATA; 1223 1224 switch (NFS_SERVER(inode)->change_attr_type) { 1225 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1226 if (cinfo->after == change_attr) 1227 goto out; 1228 break; 1229 default: 1230 if ((s64)(change_attr - cinfo->after) >= 0) 1231 goto out; 1232 } 1233 1234 inode_set_iversion_raw(inode, cinfo->after); 1235 if (!cinfo->atomic || cinfo->before != change_attr) { 1236 if (S_ISDIR(inode->i_mode)) 1237 nfs_force_lookup_revalidate(inode); 1238 1239 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1240 cache_validity |= 1241 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1242 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1243 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1244 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1245 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1246 } 1247 nfsi->attrtimeo_timestamp = jiffies; 1248 nfsi->read_cache_jiffies = timestamp; 1249 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1250 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1251 out: 1252 nfs_set_cache_invalid(inode, cache_validity); 1253 } 1254 1255 void 1256 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1257 unsigned long timestamp, unsigned long cache_validity) 1258 { 1259 spin_lock(&dir->i_lock); 1260 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1261 spin_unlock(&dir->i_lock); 1262 } 1263 1264 struct nfs4_open_createattrs { 1265 struct nfs4_label *label; 1266 struct iattr *sattr; 1267 const __u32 verf[2]; 1268 }; 1269 1270 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1271 int err, struct nfs4_exception *exception) 1272 { 1273 if (err != -EINVAL) 1274 return false; 1275 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1276 return false; 1277 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1278 exception->retry = 1; 1279 return true; 1280 } 1281 1282 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1283 { 1284 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1285 } 1286 1287 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1288 { 1289 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1290 1291 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1292 } 1293 1294 static u32 1295 nfs4_map_atomic_open_share(struct nfs_server *server, 1296 fmode_t fmode, int openflags) 1297 { 1298 u32 res = 0; 1299 1300 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1301 case FMODE_READ: 1302 res = NFS4_SHARE_ACCESS_READ; 1303 break; 1304 case FMODE_WRITE: 1305 res = NFS4_SHARE_ACCESS_WRITE; 1306 break; 1307 case FMODE_READ|FMODE_WRITE: 1308 res = NFS4_SHARE_ACCESS_BOTH; 1309 } 1310 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1311 goto out; 1312 /* Want no delegation if we're using O_DIRECT */ 1313 if (openflags & O_DIRECT) 1314 res |= NFS4_SHARE_WANT_NO_DELEG; 1315 out: 1316 return res; 1317 } 1318 1319 static enum open_claim_type4 1320 nfs4_map_atomic_open_claim(struct nfs_server *server, 1321 enum open_claim_type4 claim) 1322 { 1323 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1324 return claim; 1325 switch (claim) { 1326 default: 1327 return claim; 1328 case NFS4_OPEN_CLAIM_FH: 1329 return NFS4_OPEN_CLAIM_NULL; 1330 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1331 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1332 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1333 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1334 } 1335 } 1336 1337 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1338 { 1339 p->o_res.f_attr = &p->f_attr; 1340 p->o_res.seqid = p->o_arg.seqid; 1341 p->c_res.seqid = p->c_arg.seqid; 1342 p->o_res.server = p->o_arg.server; 1343 p->o_res.access_request = p->o_arg.access; 1344 nfs_fattr_init(&p->f_attr); 1345 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1346 } 1347 1348 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1349 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1350 const struct nfs4_open_createattrs *c, 1351 enum open_claim_type4 claim, 1352 gfp_t gfp_mask) 1353 { 1354 struct dentry *parent = dget_parent(dentry); 1355 struct inode *dir = d_inode(parent); 1356 struct nfs_server *server = NFS_SERVER(dir); 1357 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1358 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1359 struct nfs4_opendata *p; 1360 1361 p = kzalloc(sizeof(*p), gfp_mask); 1362 if (p == NULL) 1363 goto err; 1364 1365 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1366 if (IS_ERR(p->f_attr.label)) 1367 goto err_free_p; 1368 1369 p->a_label = nfs4_label_alloc(server, gfp_mask); 1370 if (IS_ERR(p->a_label)) 1371 goto err_free_f; 1372 1373 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1374 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1375 if (IS_ERR(p->o_arg.seqid)) 1376 goto err_free_label; 1377 nfs_sb_active(dentry->d_sb); 1378 p->dentry = dget(dentry); 1379 p->dir = parent; 1380 p->owner = sp; 1381 atomic_inc(&sp->so_count); 1382 p->o_arg.open_flags = flags; 1383 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1384 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1385 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1386 fmode, flags); 1387 if (flags & O_CREAT) { 1388 p->o_arg.umask = current_umask(); 1389 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1390 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1391 p->o_arg.u.attrs = &p->attrs; 1392 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1393 1394 memcpy(p->o_arg.u.verifier.data, c->verf, 1395 sizeof(p->o_arg.u.verifier.data)); 1396 } 1397 } 1398 /* ask server to check for all possible rights as results 1399 * are cached */ 1400 switch (p->o_arg.claim) { 1401 default: 1402 break; 1403 case NFS4_OPEN_CLAIM_NULL: 1404 case NFS4_OPEN_CLAIM_FH: 1405 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1406 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1407 NFS4_ACCESS_EXECUTE | 1408 nfs_access_xattr_mask(server); 1409 } 1410 p->o_arg.clientid = server->nfs_client->cl_clientid; 1411 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1412 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1413 p->o_arg.name = &dentry->d_name; 1414 p->o_arg.server = server; 1415 p->o_arg.bitmask = nfs4_bitmask(server, label); 1416 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1417 switch (p->o_arg.claim) { 1418 case NFS4_OPEN_CLAIM_NULL: 1419 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1420 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1421 p->o_arg.fh = NFS_FH(dir); 1422 break; 1423 case NFS4_OPEN_CLAIM_PREVIOUS: 1424 case NFS4_OPEN_CLAIM_FH: 1425 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1426 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1427 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1428 } 1429 p->c_arg.fh = &p->o_res.fh; 1430 p->c_arg.stateid = &p->o_res.stateid; 1431 p->c_arg.seqid = p->o_arg.seqid; 1432 nfs4_init_opendata_res(p); 1433 kref_init(&p->kref); 1434 return p; 1435 1436 err_free_label: 1437 nfs4_label_free(p->a_label); 1438 err_free_f: 1439 nfs4_label_free(p->f_attr.label); 1440 err_free_p: 1441 kfree(p); 1442 err: 1443 dput(parent); 1444 return NULL; 1445 } 1446 1447 static void nfs4_opendata_free(struct kref *kref) 1448 { 1449 struct nfs4_opendata *p = container_of(kref, 1450 struct nfs4_opendata, kref); 1451 struct super_block *sb = p->dentry->d_sb; 1452 1453 nfs4_lgopen_release(p->lgp); 1454 nfs_free_seqid(p->o_arg.seqid); 1455 nfs4_sequence_free_slot(&p->o_res.seq_res); 1456 if (p->state != NULL) 1457 nfs4_put_open_state(p->state); 1458 nfs4_put_state_owner(p->owner); 1459 1460 nfs4_label_free(p->a_label); 1461 nfs4_label_free(p->f_attr.label); 1462 1463 dput(p->dir); 1464 dput(p->dentry); 1465 nfs_sb_deactive(sb); 1466 nfs_fattr_free_names(&p->f_attr); 1467 kfree(p->f_attr.mdsthreshold); 1468 kfree(p); 1469 } 1470 1471 static void nfs4_opendata_put(struct nfs4_opendata *p) 1472 { 1473 if (p != NULL) 1474 kref_put(&p->kref, nfs4_opendata_free); 1475 } 1476 1477 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1478 fmode_t fmode) 1479 { 1480 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1481 case FMODE_READ|FMODE_WRITE: 1482 return state->n_rdwr != 0; 1483 case FMODE_WRITE: 1484 return state->n_wronly != 0; 1485 case FMODE_READ: 1486 return state->n_rdonly != 0; 1487 } 1488 WARN_ON_ONCE(1); 1489 return false; 1490 } 1491 1492 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1493 int open_mode, enum open_claim_type4 claim) 1494 { 1495 int ret = 0; 1496 1497 if (open_mode & (O_EXCL|O_TRUNC)) 1498 goto out; 1499 switch (claim) { 1500 case NFS4_OPEN_CLAIM_NULL: 1501 case NFS4_OPEN_CLAIM_FH: 1502 goto out; 1503 default: 1504 break; 1505 } 1506 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1507 case FMODE_READ: 1508 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1509 && state->n_rdonly != 0; 1510 break; 1511 case FMODE_WRITE: 1512 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1513 && state->n_wronly != 0; 1514 break; 1515 case FMODE_READ|FMODE_WRITE: 1516 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1517 && state->n_rdwr != 0; 1518 } 1519 out: 1520 return ret; 1521 } 1522 1523 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1524 enum open_claim_type4 claim) 1525 { 1526 if (delegation == NULL) 1527 return 0; 1528 if ((delegation->type & fmode) != fmode) 1529 return 0; 1530 switch (claim) { 1531 case NFS4_OPEN_CLAIM_NULL: 1532 case NFS4_OPEN_CLAIM_FH: 1533 break; 1534 case NFS4_OPEN_CLAIM_PREVIOUS: 1535 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1536 break; 1537 fallthrough; 1538 default: 1539 return 0; 1540 } 1541 nfs_mark_delegation_referenced(delegation); 1542 return 1; 1543 } 1544 1545 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1546 { 1547 switch (fmode) { 1548 case FMODE_WRITE: 1549 state->n_wronly++; 1550 break; 1551 case FMODE_READ: 1552 state->n_rdonly++; 1553 break; 1554 case FMODE_READ|FMODE_WRITE: 1555 state->n_rdwr++; 1556 } 1557 nfs4_state_set_mode_locked(state, state->state | fmode); 1558 } 1559 1560 #ifdef CONFIG_NFS_V4_1 1561 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1562 { 1563 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1564 return true; 1565 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1566 return true; 1567 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1568 return true; 1569 return false; 1570 } 1571 #endif /* CONFIG_NFS_V4_1 */ 1572 1573 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1574 { 1575 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1576 wake_up_all(&state->waitq); 1577 } 1578 1579 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1580 { 1581 struct nfs_client *clp = state->owner->so_server->nfs_client; 1582 bool need_recover = false; 1583 1584 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1585 need_recover = true; 1586 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1587 need_recover = true; 1588 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1589 need_recover = true; 1590 if (need_recover) 1591 nfs4_state_mark_reclaim_nograce(clp, state); 1592 } 1593 1594 /* 1595 * Check for whether or not the caller may update the open stateid 1596 * to the value passed in by stateid. 1597 * 1598 * Note: This function relies heavily on the server implementing 1599 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1600 * correctly. 1601 * i.e. The stateid seqids have to be initialised to 1, and 1602 * are then incremented on every state transition. 1603 */ 1604 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1605 const nfs4_stateid *stateid) 1606 { 1607 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1608 /* The common case - we're updating to a new sequence number */ 1609 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1610 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1611 return true; 1612 return false; 1613 } 1614 /* The server returned a new stateid */ 1615 } 1616 /* This is the first OPEN in this generation */ 1617 if (stateid->seqid == cpu_to_be32(1)) 1618 return true; 1619 return false; 1620 } 1621 1622 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1623 { 1624 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1625 return; 1626 if (state->n_wronly) 1627 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1628 if (state->n_rdonly) 1629 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1630 if (state->n_rdwr) 1631 set_bit(NFS_O_RDWR_STATE, &state->flags); 1632 set_bit(NFS_OPEN_STATE, &state->flags); 1633 } 1634 1635 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1636 nfs4_stateid *stateid, fmode_t fmode) 1637 { 1638 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1639 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1640 case FMODE_WRITE: 1641 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1642 break; 1643 case FMODE_READ: 1644 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1645 break; 1646 case 0: 1647 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1648 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1649 clear_bit(NFS_OPEN_STATE, &state->flags); 1650 } 1651 if (stateid == NULL) 1652 return; 1653 /* Handle OPEN+OPEN_DOWNGRADE races */ 1654 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1655 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1656 nfs_resync_open_stateid_locked(state); 1657 goto out; 1658 } 1659 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1660 nfs4_stateid_copy(&state->stateid, stateid); 1661 nfs4_stateid_copy(&state->open_stateid, stateid); 1662 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1663 out: 1664 nfs_state_log_update_open_stateid(state); 1665 } 1666 1667 static void nfs_clear_open_stateid(struct nfs4_state *state, 1668 nfs4_stateid *arg_stateid, 1669 nfs4_stateid *stateid, fmode_t fmode) 1670 { 1671 write_seqlock(&state->seqlock); 1672 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1673 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1674 nfs_clear_open_stateid_locked(state, stateid, fmode); 1675 write_sequnlock(&state->seqlock); 1676 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1677 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1678 } 1679 1680 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1681 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1682 __must_hold(&state->owner->so_lock) 1683 __must_hold(&state->seqlock) 1684 __must_hold(RCU) 1685 1686 { 1687 DEFINE_WAIT(wait); 1688 int status = 0; 1689 for (;;) { 1690 1691 if (nfs_stateid_is_sequential(state, stateid)) 1692 break; 1693 1694 if (status) 1695 break; 1696 /* Rely on seqids for serialisation with NFSv4.0 */ 1697 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1698 break; 1699 1700 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1701 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1702 /* 1703 * Ensure we process the state changes in the same order 1704 * in which the server processed them by delaying the 1705 * update of the stateid until we are in sequence. 1706 */ 1707 write_sequnlock(&state->seqlock); 1708 spin_unlock(&state->owner->so_lock); 1709 rcu_read_unlock(); 1710 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1711 1712 if (!fatal_signal_pending(current)) { 1713 if (schedule_timeout(5*HZ) == 0) 1714 status = -EAGAIN; 1715 else 1716 status = 0; 1717 } else 1718 status = -EINTR; 1719 finish_wait(&state->waitq, &wait); 1720 rcu_read_lock(); 1721 spin_lock(&state->owner->so_lock); 1722 write_seqlock(&state->seqlock); 1723 } 1724 1725 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1726 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1727 nfs4_stateid_copy(freeme, &state->open_stateid); 1728 nfs_test_and_clear_all_open_stateid(state); 1729 } 1730 1731 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1732 nfs4_stateid_copy(&state->stateid, stateid); 1733 nfs4_stateid_copy(&state->open_stateid, stateid); 1734 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1735 nfs_state_log_update_open_stateid(state); 1736 } 1737 1738 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1739 const nfs4_stateid *open_stateid, 1740 fmode_t fmode, 1741 nfs4_stateid *freeme) 1742 { 1743 /* 1744 * Protect the call to nfs4_state_set_mode_locked and 1745 * serialise the stateid update 1746 */ 1747 write_seqlock(&state->seqlock); 1748 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1749 switch (fmode) { 1750 case FMODE_READ: 1751 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1752 break; 1753 case FMODE_WRITE: 1754 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1755 break; 1756 case FMODE_READ|FMODE_WRITE: 1757 set_bit(NFS_O_RDWR_STATE, &state->flags); 1758 } 1759 set_bit(NFS_OPEN_STATE, &state->flags); 1760 write_sequnlock(&state->seqlock); 1761 } 1762 1763 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1764 { 1765 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1766 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1767 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1768 clear_bit(NFS_OPEN_STATE, &state->flags); 1769 } 1770 1771 static void nfs_state_set_delegation(struct nfs4_state *state, 1772 const nfs4_stateid *deleg_stateid, 1773 fmode_t fmode) 1774 { 1775 /* 1776 * Protect the call to nfs4_state_set_mode_locked and 1777 * serialise the stateid update 1778 */ 1779 write_seqlock(&state->seqlock); 1780 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1781 set_bit(NFS_DELEGATED_STATE, &state->flags); 1782 write_sequnlock(&state->seqlock); 1783 } 1784 1785 static void nfs_state_clear_delegation(struct nfs4_state *state) 1786 { 1787 write_seqlock(&state->seqlock); 1788 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1789 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1790 write_sequnlock(&state->seqlock); 1791 } 1792 1793 int update_open_stateid(struct nfs4_state *state, 1794 const nfs4_stateid *open_stateid, 1795 const nfs4_stateid *delegation, 1796 fmode_t fmode) 1797 { 1798 struct nfs_server *server = NFS_SERVER(state->inode); 1799 struct nfs_client *clp = server->nfs_client; 1800 struct nfs_inode *nfsi = NFS_I(state->inode); 1801 struct nfs_delegation *deleg_cur; 1802 nfs4_stateid freeme = { }; 1803 int ret = 0; 1804 1805 fmode &= (FMODE_READ|FMODE_WRITE); 1806 1807 rcu_read_lock(); 1808 spin_lock(&state->owner->so_lock); 1809 if (open_stateid != NULL) { 1810 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1811 ret = 1; 1812 } 1813 1814 deleg_cur = nfs4_get_valid_delegation(state->inode); 1815 if (deleg_cur == NULL) 1816 goto no_delegation; 1817 1818 spin_lock(&deleg_cur->lock); 1819 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1820 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1821 (deleg_cur->type & fmode) != fmode) 1822 goto no_delegation_unlock; 1823 1824 if (delegation == NULL) 1825 delegation = &deleg_cur->stateid; 1826 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1827 goto no_delegation_unlock; 1828 1829 nfs_mark_delegation_referenced(deleg_cur); 1830 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1831 ret = 1; 1832 no_delegation_unlock: 1833 spin_unlock(&deleg_cur->lock); 1834 no_delegation: 1835 if (ret) 1836 update_open_stateflags(state, fmode); 1837 spin_unlock(&state->owner->so_lock); 1838 rcu_read_unlock(); 1839 1840 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1841 nfs4_schedule_state_manager(clp); 1842 if (freeme.type != 0) 1843 nfs4_test_and_free_stateid(server, &freeme, 1844 state->owner->so_cred); 1845 1846 return ret; 1847 } 1848 1849 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1850 const nfs4_stateid *stateid) 1851 { 1852 struct nfs4_state *state = lsp->ls_state; 1853 bool ret = false; 1854 1855 spin_lock(&state->state_lock); 1856 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1857 goto out_noupdate; 1858 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1859 goto out_noupdate; 1860 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1861 ret = true; 1862 out_noupdate: 1863 spin_unlock(&state->state_lock); 1864 return ret; 1865 } 1866 1867 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1868 { 1869 struct nfs_delegation *delegation; 1870 1871 fmode &= FMODE_READ|FMODE_WRITE; 1872 rcu_read_lock(); 1873 delegation = nfs4_get_valid_delegation(inode); 1874 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1875 rcu_read_unlock(); 1876 return; 1877 } 1878 rcu_read_unlock(); 1879 nfs4_inode_return_delegation(inode); 1880 } 1881 1882 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1883 { 1884 struct nfs4_state *state = opendata->state; 1885 struct nfs_delegation *delegation; 1886 int open_mode = opendata->o_arg.open_flags; 1887 fmode_t fmode = opendata->o_arg.fmode; 1888 enum open_claim_type4 claim = opendata->o_arg.claim; 1889 nfs4_stateid stateid; 1890 int ret = -EAGAIN; 1891 1892 for (;;) { 1893 spin_lock(&state->owner->so_lock); 1894 if (can_open_cached(state, fmode, open_mode, claim)) { 1895 update_open_stateflags(state, fmode); 1896 spin_unlock(&state->owner->so_lock); 1897 goto out_return_state; 1898 } 1899 spin_unlock(&state->owner->so_lock); 1900 rcu_read_lock(); 1901 delegation = nfs4_get_valid_delegation(state->inode); 1902 if (!can_open_delegated(delegation, fmode, claim)) { 1903 rcu_read_unlock(); 1904 break; 1905 } 1906 /* Save the delegation */ 1907 nfs4_stateid_copy(&stateid, &delegation->stateid); 1908 rcu_read_unlock(); 1909 nfs_release_seqid(opendata->o_arg.seqid); 1910 if (!opendata->is_recover) { 1911 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1912 if (ret != 0) 1913 goto out; 1914 } 1915 ret = -EAGAIN; 1916 1917 /* Try to update the stateid using the delegation */ 1918 if (update_open_stateid(state, NULL, &stateid, fmode)) 1919 goto out_return_state; 1920 } 1921 out: 1922 return ERR_PTR(ret); 1923 out_return_state: 1924 refcount_inc(&state->count); 1925 return state; 1926 } 1927 1928 static void 1929 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1930 { 1931 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1932 struct nfs_delegation *delegation; 1933 int delegation_flags = 0; 1934 1935 rcu_read_lock(); 1936 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1937 if (delegation) 1938 delegation_flags = delegation->flags; 1939 rcu_read_unlock(); 1940 switch (data->o_arg.claim) { 1941 default: 1942 break; 1943 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1944 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1945 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1946 "returning a delegation for " 1947 "OPEN(CLAIM_DELEGATE_CUR)\n", 1948 clp->cl_hostname); 1949 return; 1950 } 1951 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1952 nfs_inode_set_delegation(state->inode, 1953 data->owner->so_cred, 1954 data->o_res.delegation_type, 1955 &data->o_res.delegation, 1956 data->o_res.pagemod_limit); 1957 else 1958 nfs_inode_reclaim_delegation(state->inode, 1959 data->owner->so_cred, 1960 data->o_res.delegation_type, 1961 &data->o_res.delegation, 1962 data->o_res.pagemod_limit); 1963 1964 if (data->o_res.do_recall) 1965 nfs_async_inode_return_delegation(state->inode, 1966 &data->o_res.delegation); 1967 } 1968 1969 /* 1970 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1971 * and update the nfs4_state. 1972 */ 1973 static struct nfs4_state * 1974 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1975 { 1976 struct inode *inode = data->state->inode; 1977 struct nfs4_state *state = data->state; 1978 int ret; 1979 1980 if (!data->rpc_done) { 1981 if (data->rpc_status) 1982 return ERR_PTR(data->rpc_status); 1983 return nfs4_try_open_cached(data); 1984 } 1985 1986 ret = nfs_refresh_inode(inode, &data->f_attr); 1987 if (ret) 1988 return ERR_PTR(ret); 1989 1990 if (data->o_res.delegation_type != 0) 1991 nfs4_opendata_check_deleg(data, state); 1992 1993 if (!update_open_stateid(state, &data->o_res.stateid, 1994 NULL, data->o_arg.fmode)) 1995 return ERR_PTR(-EAGAIN); 1996 refcount_inc(&state->count); 1997 1998 return state; 1999 } 2000 2001 static struct inode * 2002 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2003 { 2004 struct inode *inode; 2005 2006 switch (data->o_arg.claim) { 2007 case NFS4_OPEN_CLAIM_NULL: 2008 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2009 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2010 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2011 return ERR_PTR(-EAGAIN); 2012 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2013 &data->f_attr); 2014 break; 2015 default: 2016 inode = d_inode(data->dentry); 2017 ihold(inode); 2018 nfs_refresh_inode(inode, &data->f_attr); 2019 } 2020 return inode; 2021 } 2022 2023 static struct nfs4_state * 2024 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2025 { 2026 struct nfs4_state *state; 2027 struct inode *inode; 2028 2029 inode = nfs4_opendata_get_inode(data); 2030 if (IS_ERR(inode)) 2031 return ERR_CAST(inode); 2032 if (data->state != NULL && data->state->inode == inode) { 2033 state = data->state; 2034 refcount_inc(&state->count); 2035 } else 2036 state = nfs4_get_open_state(inode, data->owner); 2037 iput(inode); 2038 if (state == NULL) 2039 state = ERR_PTR(-ENOMEM); 2040 return state; 2041 } 2042 2043 static struct nfs4_state * 2044 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2045 { 2046 struct nfs4_state *state; 2047 2048 if (!data->rpc_done) { 2049 state = nfs4_try_open_cached(data); 2050 trace_nfs4_cached_open(data->state); 2051 goto out; 2052 } 2053 2054 state = nfs4_opendata_find_nfs4_state(data); 2055 if (IS_ERR(state)) 2056 goto out; 2057 2058 if (data->o_res.delegation_type != 0) 2059 nfs4_opendata_check_deleg(data, state); 2060 if (!update_open_stateid(state, &data->o_res.stateid, 2061 NULL, data->o_arg.fmode)) { 2062 nfs4_put_open_state(state); 2063 state = ERR_PTR(-EAGAIN); 2064 } 2065 out: 2066 nfs_release_seqid(data->o_arg.seqid); 2067 return state; 2068 } 2069 2070 static struct nfs4_state * 2071 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2072 { 2073 struct nfs4_state *ret; 2074 2075 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2076 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2077 else 2078 ret = _nfs4_opendata_to_nfs4_state(data); 2079 nfs4_sequence_free_slot(&data->o_res.seq_res); 2080 return ret; 2081 } 2082 2083 static struct nfs_open_context * 2084 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2085 { 2086 struct nfs_inode *nfsi = NFS_I(state->inode); 2087 struct nfs_open_context *ctx; 2088 2089 rcu_read_lock(); 2090 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2091 if (ctx->state != state) 2092 continue; 2093 if ((ctx->mode & mode) != mode) 2094 continue; 2095 if (!get_nfs_open_context(ctx)) 2096 continue; 2097 rcu_read_unlock(); 2098 return ctx; 2099 } 2100 rcu_read_unlock(); 2101 return ERR_PTR(-ENOENT); 2102 } 2103 2104 static struct nfs_open_context * 2105 nfs4_state_find_open_context(struct nfs4_state *state) 2106 { 2107 struct nfs_open_context *ctx; 2108 2109 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2110 if (!IS_ERR(ctx)) 2111 return ctx; 2112 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2113 if (!IS_ERR(ctx)) 2114 return ctx; 2115 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2116 } 2117 2118 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2119 struct nfs4_state *state, enum open_claim_type4 claim) 2120 { 2121 struct nfs4_opendata *opendata; 2122 2123 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2124 NULL, claim, GFP_NOFS); 2125 if (opendata == NULL) 2126 return ERR_PTR(-ENOMEM); 2127 opendata->state = state; 2128 refcount_inc(&state->count); 2129 return opendata; 2130 } 2131 2132 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2133 fmode_t fmode) 2134 { 2135 struct nfs4_state *newstate; 2136 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2137 int openflags = opendata->o_arg.open_flags; 2138 int ret; 2139 2140 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2141 return 0; 2142 opendata->o_arg.fmode = fmode; 2143 opendata->o_arg.share_access = 2144 nfs4_map_atomic_open_share(server, fmode, openflags); 2145 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2146 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2147 nfs4_init_opendata_res(opendata); 2148 ret = _nfs4_recover_proc_open(opendata); 2149 if (ret != 0) 2150 return ret; 2151 newstate = nfs4_opendata_to_nfs4_state(opendata); 2152 if (IS_ERR(newstate)) 2153 return PTR_ERR(newstate); 2154 if (newstate != opendata->state) 2155 ret = -ESTALE; 2156 nfs4_close_state(newstate, fmode); 2157 return ret; 2158 } 2159 2160 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2161 { 2162 int ret; 2163 2164 /* memory barrier prior to reading state->n_* */ 2165 smp_rmb(); 2166 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2167 if (ret != 0) 2168 return ret; 2169 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2170 if (ret != 0) 2171 return ret; 2172 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2173 if (ret != 0) 2174 return ret; 2175 /* 2176 * We may have performed cached opens for all three recoveries. 2177 * Check if we need to update the current stateid. 2178 */ 2179 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2180 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2181 write_seqlock(&state->seqlock); 2182 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2183 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2184 write_sequnlock(&state->seqlock); 2185 } 2186 return 0; 2187 } 2188 2189 /* 2190 * OPEN_RECLAIM: 2191 * reclaim state on the server after a reboot. 2192 */ 2193 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2194 { 2195 struct nfs_delegation *delegation; 2196 struct nfs4_opendata *opendata; 2197 fmode_t delegation_type = 0; 2198 int status; 2199 2200 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2201 NFS4_OPEN_CLAIM_PREVIOUS); 2202 if (IS_ERR(opendata)) 2203 return PTR_ERR(opendata); 2204 rcu_read_lock(); 2205 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2206 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2207 delegation_type = delegation->type; 2208 rcu_read_unlock(); 2209 opendata->o_arg.u.delegation_type = delegation_type; 2210 status = nfs4_open_recover(opendata, state); 2211 nfs4_opendata_put(opendata); 2212 return status; 2213 } 2214 2215 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2216 { 2217 struct nfs_server *server = NFS_SERVER(state->inode); 2218 struct nfs4_exception exception = { }; 2219 int err; 2220 do { 2221 err = _nfs4_do_open_reclaim(ctx, state); 2222 trace_nfs4_open_reclaim(ctx, 0, err); 2223 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2224 continue; 2225 if (err != -NFS4ERR_DELAY) 2226 break; 2227 nfs4_handle_exception(server, err, &exception); 2228 } while (exception.retry); 2229 return err; 2230 } 2231 2232 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2233 { 2234 struct nfs_open_context *ctx; 2235 int ret; 2236 2237 ctx = nfs4_state_find_open_context(state); 2238 if (IS_ERR(ctx)) 2239 return -EAGAIN; 2240 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2241 nfs_state_clear_open_state_flags(state); 2242 ret = nfs4_do_open_reclaim(ctx, state); 2243 put_nfs_open_context(ctx); 2244 return ret; 2245 } 2246 2247 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) 2248 { 2249 switch (err) { 2250 default: 2251 printk(KERN_ERR "NFS: %s: unhandled error " 2252 "%d.\n", __func__, err); 2253 fallthrough; 2254 case 0: 2255 case -ENOENT: 2256 case -EAGAIN: 2257 case -ESTALE: 2258 case -ETIMEDOUT: 2259 break; 2260 case -NFS4ERR_BADSESSION: 2261 case -NFS4ERR_BADSLOT: 2262 case -NFS4ERR_BAD_HIGH_SLOT: 2263 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2264 case -NFS4ERR_DEADSESSION: 2265 return -EAGAIN; 2266 case -NFS4ERR_STALE_CLIENTID: 2267 case -NFS4ERR_STALE_STATEID: 2268 /* Don't recall a delegation if it was lost */ 2269 nfs4_schedule_lease_recovery(server->nfs_client); 2270 return -EAGAIN; 2271 case -NFS4ERR_MOVED: 2272 nfs4_schedule_migration_recovery(server); 2273 return -EAGAIN; 2274 case -NFS4ERR_LEASE_MOVED: 2275 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2276 return -EAGAIN; 2277 case -NFS4ERR_DELEG_REVOKED: 2278 case -NFS4ERR_ADMIN_REVOKED: 2279 case -NFS4ERR_EXPIRED: 2280 case -NFS4ERR_BAD_STATEID: 2281 case -NFS4ERR_OPENMODE: 2282 nfs_inode_find_state_and_recover(state->inode, 2283 stateid); 2284 nfs4_schedule_stateid_recovery(server, state); 2285 return -EAGAIN; 2286 case -NFS4ERR_DELAY: 2287 case -NFS4ERR_GRACE: 2288 ssleep(1); 2289 return -EAGAIN; 2290 case -ENOMEM: 2291 case -NFS4ERR_DENIED: 2292 if (fl) { 2293 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2294 if (lsp) 2295 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2296 } 2297 return 0; 2298 } 2299 return err; 2300 } 2301 2302 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2303 struct nfs4_state *state, const nfs4_stateid *stateid) 2304 { 2305 struct nfs_server *server = NFS_SERVER(state->inode); 2306 struct nfs4_opendata *opendata; 2307 int err = 0; 2308 2309 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2310 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2311 if (IS_ERR(opendata)) 2312 return PTR_ERR(opendata); 2313 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2314 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2315 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2316 if (err) 2317 goto out; 2318 } 2319 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2320 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2321 if (err) 2322 goto out; 2323 } 2324 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2325 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2326 if (err) 2327 goto out; 2328 } 2329 nfs_state_clear_delegation(state); 2330 out: 2331 nfs4_opendata_put(opendata); 2332 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2333 } 2334 2335 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2336 { 2337 struct nfs4_opendata *data = calldata; 2338 2339 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2340 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2341 } 2342 2343 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2344 { 2345 struct nfs4_opendata *data = calldata; 2346 2347 nfs40_sequence_done(task, &data->c_res.seq_res); 2348 2349 data->rpc_status = task->tk_status; 2350 if (data->rpc_status == 0) { 2351 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2352 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2353 renew_lease(data->o_res.server, data->timestamp); 2354 data->rpc_done = true; 2355 } 2356 } 2357 2358 static void nfs4_open_confirm_release(void *calldata) 2359 { 2360 struct nfs4_opendata *data = calldata; 2361 struct nfs4_state *state = NULL; 2362 2363 /* If this request hasn't been cancelled, do nothing */ 2364 if (!data->cancelled) 2365 goto out_free; 2366 /* In case of error, no cleanup! */ 2367 if (!data->rpc_done) 2368 goto out_free; 2369 state = nfs4_opendata_to_nfs4_state(data); 2370 if (!IS_ERR(state)) 2371 nfs4_close_state(state, data->o_arg.fmode); 2372 out_free: 2373 nfs4_opendata_put(data); 2374 } 2375 2376 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2377 .rpc_call_prepare = nfs4_open_confirm_prepare, 2378 .rpc_call_done = nfs4_open_confirm_done, 2379 .rpc_release = nfs4_open_confirm_release, 2380 }; 2381 2382 /* 2383 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2384 */ 2385 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2386 { 2387 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2388 struct rpc_task *task; 2389 struct rpc_message msg = { 2390 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2391 .rpc_argp = &data->c_arg, 2392 .rpc_resp = &data->c_res, 2393 .rpc_cred = data->owner->so_cred, 2394 }; 2395 struct rpc_task_setup task_setup_data = { 2396 .rpc_client = server->client, 2397 .rpc_message = &msg, 2398 .callback_ops = &nfs4_open_confirm_ops, 2399 .callback_data = data, 2400 .workqueue = nfsiod_workqueue, 2401 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2402 }; 2403 int status; 2404 2405 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2406 data->is_recover); 2407 kref_get(&data->kref); 2408 data->rpc_done = false; 2409 data->rpc_status = 0; 2410 data->timestamp = jiffies; 2411 task = rpc_run_task(&task_setup_data); 2412 if (IS_ERR(task)) 2413 return PTR_ERR(task); 2414 status = rpc_wait_for_completion_task(task); 2415 if (status != 0) { 2416 data->cancelled = true; 2417 smp_wmb(); 2418 } else 2419 status = data->rpc_status; 2420 rpc_put_task(task); 2421 return status; 2422 } 2423 2424 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2425 { 2426 struct nfs4_opendata *data = calldata; 2427 struct nfs4_state_owner *sp = data->owner; 2428 struct nfs_client *clp = sp->so_server->nfs_client; 2429 enum open_claim_type4 claim = data->o_arg.claim; 2430 2431 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2432 goto out_wait; 2433 /* 2434 * Check if we still need to send an OPEN call, or if we can use 2435 * a delegation instead. 2436 */ 2437 if (data->state != NULL) { 2438 struct nfs_delegation *delegation; 2439 2440 if (can_open_cached(data->state, data->o_arg.fmode, 2441 data->o_arg.open_flags, claim)) 2442 goto out_no_action; 2443 rcu_read_lock(); 2444 delegation = nfs4_get_valid_delegation(data->state->inode); 2445 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2446 goto unlock_no_action; 2447 rcu_read_unlock(); 2448 } 2449 /* Update client id. */ 2450 data->o_arg.clientid = clp->cl_clientid; 2451 switch (claim) { 2452 default: 2453 break; 2454 case NFS4_OPEN_CLAIM_PREVIOUS: 2455 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2456 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2457 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2458 fallthrough; 2459 case NFS4_OPEN_CLAIM_FH: 2460 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2461 } 2462 data->timestamp = jiffies; 2463 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2464 &data->o_arg.seq_args, 2465 &data->o_res.seq_res, 2466 task) != 0) 2467 nfs_release_seqid(data->o_arg.seqid); 2468 2469 /* Set the create mode (note dependency on the session type) */ 2470 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2471 if (data->o_arg.open_flags & O_EXCL) { 2472 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2473 if (clp->cl_mvops->minor_version == 0) { 2474 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2475 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2476 * because ACCESS will return permission denied for 2477 * all bits until close */ 2478 data->o_res.access_request = data->o_arg.access = 0; 2479 } else if (nfs4_has_persistent_session(clp)) 2480 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2481 } 2482 return; 2483 unlock_no_action: 2484 trace_nfs4_cached_open(data->state); 2485 rcu_read_unlock(); 2486 out_no_action: 2487 task->tk_action = NULL; 2488 out_wait: 2489 nfs4_sequence_done(task, &data->o_res.seq_res); 2490 } 2491 2492 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2493 { 2494 struct nfs4_opendata *data = calldata; 2495 2496 data->rpc_status = task->tk_status; 2497 2498 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2499 return; 2500 2501 if (task->tk_status == 0) { 2502 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2503 switch (data->o_res.f_attr->mode & S_IFMT) { 2504 case S_IFREG: 2505 break; 2506 case S_IFLNK: 2507 data->rpc_status = -ELOOP; 2508 break; 2509 case S_IFDIR: 2510 data->rpc_status = -EISDIR; 2511 break; 2512 default: 2513 data->rpc_status = -ENOTDIR; 2514 } 2515 } 2516 renew_lease(data->o_res.server, data->timestamp); 2517 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2518 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2519 } 2520 data->rpc_done = true; 2521 } 2522 2523 static void nfs4_open_release(void *calldata) 2524 { 2525 struct nfs4_opendata *data = calldata; 2526 struct nfs4_state *state = NULL; 2527 2528 /* If this request hasn't been cancelled, do nothing */ 2529 if (!data->cancelled) 2530 goto out_free; 2531 /* In case of error, no cleanup! */ 2532 if (data->rpc_status != 0 || !data->rpc_done) 2533 goto out_free; 2534 /* In case we need an open_confirm, no cleanup! */ 2535 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2536 goto out_free; 2537 state = nfs4_opendata_to_nfs4_state(data); 2538 if (!IS_ERR(state)) 2539 nfs4_close_state(state, data->o_arg.fmode); 2540 out_free: 2541 nfs4_opendata_put(data); 2542 } 2543 2544 static const struct rpc_call_ops nfs4_open_ops = { 2545 .rpc_call_prepare = nfs4_open_prepare, 2546 .rpc_call_done = nfs4_open_done, 2547 .rpc_release = nfs4_open_release, 2548 }; 2549 2550 static int nfs4_run_open_task(struct nfs4_opendata *data, 2551 struct nfs_open_context *ctx) 2552 { 2553 struct inode *dir = d_inode(data->dir); 2554 struct nfs_server *server = NFS_SERVER(dir); 2555 struct nfs_openargs *o_arg = &data->o_arg; 2556 struct nfs_openres *o_res = &data->o_res; 2557 struct rpc_task *task; 2558 struct rpc_message msg = { 2559 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2560 .rpc_argp = o_arg, 2561 .rpc_resp = o_res, 2562 .rpc_cred = data->owner->so_cred, 2563 }; 2564 struct rpc_task_setup task_setup_data = { 2565 .rpc_client = server->client, 2566 .rpc_message = &msg, 2567 .callback_ops = &nfs4_open_ops, 2568 .callback_data = data, 2569 .workqueue = nfsiod_workqueue, 2570 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2571 }; 2572 int status; 2573 2574 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2575 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2576 2577 kref_get(&data->kref); 2578 data->rpc_done = false; 2579 data->rpc_status = 0; 2580 data->cancelled = false; 2581 data->is_recover = false; 2582 if (!ctx) { 2583 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2584 data->is_recover = true; 2585 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2586 } else { 2587 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2588 pnfs_lgopen_prepare(data, ctx); 2589 } 2590 task = rpc_run_task(&task_setup_data); 2591 if (IS_ERR(task)) 2592 return PTR_ERR(task); 2593 status = rpc_wait_for_completion_task(task); 2594 if (status != 0) { 2595 data->cancelled = true; 2596 smp_wmb(); 2597 } else 2598 status = data->rpc_status; 2599 rpc_put_task(task); 2600 2601 return status; 2602 } 2603 2604 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2605 { 2606 struct inode *dir = d_inode(data->dir); 2607 struct nfs_openres *o_res = &data->o_res; 2608 int status; 2609 2610 status = nfs4_run_open_task(data, NULL); 2611 if (status != 0 || !data->rpc_done) 2612 return status; 2613 2614 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2615 2616 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2617 status = _nfs4_proc_open_confirm(data); 2618 2619 return status; 2620 } 2621 2622 /* 2623 * Additional permission checks in order to distinguish between an 2624 * open for read, and an open for execute. This works around the 2625 * fact that NFSv4 OPEN treats read and execute permissions as being 2626 * the same. 2627 * Note that in the non-execute case, we want to turn off permission 2628 * checking if we just created a new file (POSIX open() semantics). 2629 */ 2630 static int nfs4_opendata_access(const struct cred *cred, 2631 struct nfs4_opendata *opendata, 2632 struct nfs4_state *state, fmode_t fmode) 2633 { 2634 struct nfs_access_entry cache; 2635 u32 mask, flags; 2636 2637 /* access call failed or for some reason the server doesn't 2638 * support any access modes -- defer access call until later */ 2639 if (opendata->o_res.access_supported == 0) 2640 return 0; 2641 2642 mask = 0; 2643 if (fmode & FMODE_EXEC) { 2644 /* ONLY check for exec rights */ 2645 if (S_ISDIR(state->inode->i_mode)) 2646 mask = NFS4_ACCESS_LOOKUP; 2647 else 2648 mask = NFS4_ACCESS_EXECUTE; 2649 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2650 mask = NFS4_ACCESS_READ; 2651 2652 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2653 nfs_access_add_cache(state->inode, &cache, cred); 2654 2655 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2656 if ((mask & ~cache.mask & flags) == 0) 2657 return 0; 2658 2659 return -EACCES; 2660 } 2661 2662 /* 2663 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2664 */ 2665 static int _nfs4_proc_open(struct nfs4_opendata *data, 2666 struct nfs_open_context *ctx) 2667 { 2668 struct inode *dir = d_inode(data->dir); 2669 struct nfs_server *server = NFS_SERVER(dir); 2670 struct nfs_openargs *o_arg = &data->o_arg; 2671 struct nfs_openres *o_res = &data->o_res; 2672 int status; 2673 2674 status = nfs4_run_open_task(data, ctx); 2675 if (!data->rpc_done) 2676 return status; 2677 if (status != 0) { 2678 if (status == -NFS4ERR_BADNAME && 2679 !(o_arg->open_flags & O_CREAT)) 2680 return -ENOENT; 2681 return status; 2682 } 2683 2684 nfs_fattr_map_and_free_names(server, &data->f_attr); 2685 2686 if (o_arg->open_flags & O_CREAT) { 2687 if (o_arg->open_flags & O_EXCL) 2688 data->file_created = true; 2689 else if (o_res->cinfo.before != o_res->cinfo.after) 2690 data->file_created = true; 2691 if (data->file_created || 2692 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2693 nfs4_update_changeattr(dir, &o_res->cinfo, 2694 o_res->f_attr->time_start, 2695 NFS_INO_INVALID_DATA); 2696 } 2697 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2698 server->caps &= ~NFS_CAP_POSIX_LOCK; 2699 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2700 status = _nfs4_proc_open_confirm(data); 2701 if (status != 0) 2702 return status; 2703 } 2704 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2705 nfs4_sequence_free_slot(&o_res->seq_res); 2706 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL); 2707 } 2708 return 0; 2709 } 2710 2711 /* 2712 * OPEN_EXPIRED: 2713 * reclaim state on the server after a network partition. 2714 * Assumes caller holds the appropriate lock 2715 */ 2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2717 { 2718 struct nfs4_opendata *opendata; 2719 int ret; 2720 2721 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2722 if (IS_ERR(opendata)) 2723 return PTR_ERR(opendata); 2724 /* 2725 * We're not recovering a delegation, so ask for no delegation. 2726 * Otherwise the recovery thread could deadlock with an outstanding 2727 * delegation return. 2728 */ 2729 opendata->o_arg.open_flags = O_DIRECT; 2730 ret = nfs4_open_recover(opendata, state); 2731 if (ret == -ESTALE) 2732 d_drop(ctx->dentry); 2733 nfs4_opendata_put(opendata); 2734 return ret; 2735 } 2736 2737 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2738 { 2739 struct nfs_server *server = NFS_SERVER(state->inode); 2740 struct nfs4_exception exception = { }; 2741 int err; 2742 2743 do { 2744 err = _nfs4_open_expired(ctx, state); 2745 trace_nfs4_open_expired(ctx, 0, err); 2746 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2747 continue; 2748 switch (err) { 2749 default: 2750 goto out; 2751 case -NFS4ERR_GRACE: 2752 case -NFS4ERR_DELAY: 2753 nfs4_handle_exception(server, err, &exception); 2754 err = 0; 2755 } 2756 } while (exception.retry); 2757 out: 2758 return err; 2759 } 2760 2761 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2762 { 2763 struct nfs_open_context *ctx; 2764 int ret; 2765 2766 ctx = nfs4_state_find_open_context(state); 2767 if (IS_ERR(ctx)) 2768 return -EAGAIN; 2769 ret = nfs4_do_open_expired(ctx, state); 2770 put_nfs_open_context(ctx); 2771 return ret; 2772 } 2773 2774 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2775 const nfs4_stateid *stateid) 2776 { 2777 nfs_remove_bad_delegation(state->inode, stateid); 2778 nfs_state_clear_delegation(state); 2779 } 2780 2781 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2782 { 2783 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2784 nfs_finish_clear_delegation_stateid(state, NULL); 2785 } 2786 2787 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2788 { 2789 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2790 nfs40_clear_delegation_stateid(state); 2791 nfs_state_clear_open_state_flags(state); 2792 return nfs4_open_expired(sp, state); 2793 } 2794 2795 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2796 nfs4_stateid *stateid, 2797 const struct cred *cred) 2798 { 2799 return -NFS4ERR_BAD_STATEID; 2800 } 2801 2802 #if defined(CONFIG_NFS_V4_1) 2803 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2804 nfs4_stateid *stateid, 2805 const struct cred *cred) 2806 { 2807 int status; 2808 2809 switch (stateid->type) { 2810 default: 2811 break; 2812 case NFS4_INVALID_STATEID_TYPE: 2813 case NFS4_SPECIAL_STATEID_TYPE: 2814 return -NFS4ERR_BAD_STATEID; 2815 case NFS4_REVOKED_STATEID_TYPE: 2816 goto out_free; 2817 } 2818 2819 status = nfs41_test_stateid(server, stateid, cred); 2820 switch (status) { 2821 case -NFS4ERR_EXPIRED: 2822 case -NFS4ERR_ADMIN_REVOKED: 2823 case -NFS4ERR_DELEG_REVOKED: 2824 break; 2825 default: 2826 return status; 2827 } 2828 out_free: 2829 /* Ack the revoked state to the server */ 2830 nfs41_free_stateid(server, stateid, cred, true); 2831 return -NFS4ERR_EXPIRED; 2832 } 2833 2834 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2835 { 2836 struct nfs_server *server = NFS_SERVER(state->inode); 2837 nfs4_stateid stateid; 2838 struct nfs_delegation *delegation; 2839 const struct cred *cred = NULL; 2840 int status, ret = NFS_OK; 2841 2842 /* Get the delegation credential for use by test/free_stateid */ 2843 rcu_read_lock(); 2844 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2845 if (delegation == NULL) { 2846 rcu_read_unlock(); 2847 nfs_state_clear_delegation(state); 2848 return NFS_OK; 2849 } 2850 2851 spin_lock(&delegation->lock); 2852 nfs4_stateid_copy(&stateid, &delegation->stateid); 2853 2854 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2855 &delegation->flags)) { 2856 spin_unlock(&delegation->lock); 2857 rcu_read_unlock(); 2858 return NFS_OK; 2859 } 2860 2861 if (delegation->cred) 2862 cred = get_cred(delegation->cred); 2863 spin_unlock(&delegation->lock); 2864 rcu_read_unlock(); 2865 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2866 trace_nfs4_test_delegation_stateid(state, NULL, status); 2867 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2868 nfs_finish_clear_delegation_stateid(state, &stateid); 2869 else 2870 ret = status; 2871 2872 put_cred(cred); 2873 return ret; 2874 } 2875 2876 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2877 { 2878 nfs4_stateid tmp; 2879 2880 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2881 nfs4_copy_delegation_stateid(state->inode, state->state, 2882 &tmp, NULL) && 2883 nfs4_stateid_match_other(&state->stateid, &tmp)) 2884 nfs_state_set_delegation(state, &tmp, state->state); 2885 else 2886 nfs_state_clear_delegation(state); 2887 } 2888 2889 /** 2890 * nfs41_check_expired_locks - possibly free a lock stateid 2891 * 2892 * @state: NFSv4 state for an inode 2893 * 2894 * Returns NFS_OK if recovery for this stateid is now finished. 2895 * Otherwise a negative NFS4ERR value is returned. 2896 */ 2897 static int nfs41_check_expired_locks(struct nfs4_state *state) 2898 { 2899 int status, ret = NFS_OK; 2900 struct nfs4_lock_state *lsp, *prev = NULL; 2901 struct nfs_server *server = NFS_SERVER(state->inode); 2902 2903 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2904 goto out; 2905 2906 spin_lock(&state->state_lock); 2907 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2908 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2909 const struct cred *cred = lsp->ls_state->owner->so_cred; 2910 2911 refcount_inc(&lsp->ls_count); 2912 spin_unlock(&state->state_lock); 2913 2914 nfs4_put_lock_state(prev); 2915 prev = lsp; 2916 2917 status = nfs41_test_and_free_expired_stateid(server, 2918 &lsp->ls_stateid, 2919 cred); 2920 trace_nfs4_test_lock_stateid(state, lsp, status); 2921 if (status == -NFS4ERR_EXPIRED || 2922 status == -NFS4ERR_BAD_STATEID) { 2923 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2924 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2925 if (!recover_lost_locks) 2926 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2927 } else if (status != NFS_OK) { 2928 ret = status; 2929 nfs4_put_lock_state(prev); 2930 goto out; 2931 } 2932 spin_lock(&state->state_lock); 2933 } 2934 } 2935 spin_unlock(&state->state_lock); 2936 nfs4_put_lock_state(prev); 2937 out: 2938 return ret; 2939 } 2940 2941 /** 2942 * nfs41_check_open_stateid - possibly free an open stateid 2943 * 2944 * @state: NFSv4 state for an inode 2945 * 2946 * Returns NFS_OK if recovery for this stateid is now finished. 2947 * Otherwise a negative NFS4ERR value is returned. 2948 */ 2949 static int nfs41_check_open_stateid(struct nfs4_state *state) 2950 { 2951 struct nfs_server *server = NFS_SERVER(state->inode); 2952 nfs4_stateid *stateid = &state->open_stateid; 2953 const struct cred *cred = state->owner->so_cred; 2954 int status; 2955 2956 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2957 return -NFS4ERR_BAD_STATEID; 2958 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2959 trace_nfs4_test_open_stateid(state, NULL, status); 2960 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2961 nfs_state_clear_open_state_flags(state); 2962 stateid->type = NFS4_INVALID_STATEID_TYPE; 2963 return status; 2964 } 2965 if (nfs_open_stateid_recover_openmode(state)) 2966 return -NFS4ERR_OPENMODE; 2967 return NFS_OK; 2968 } 2969 2970 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2971 { 2972 int status; 2973 2974 status = nfs41_check_delegation_stateid(state); 2975 if (status != NFS_OK) 2976 return status; 2977 nfs41_delegation_recover_stateid(state); 2978 2979 status = nfs41_check_expired_locks(state); 2980 if (status != NFS_OK) 2981 return status; 2982 status = nfs41_check_open_stateid(state); 2983 if (status != NFS_OK) 2984 status = nfs4_open_expired(sp, state); 2985 return status; 2986 } 2987 #endif 2988 2989 /* 2990 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2991 * fields corresponding to attributes that were used to store the verifier. 2992 * Make sure we clobber those fields in the later setattr call 2993 */ 2994 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2995 struct iattr *sattr, struct nfs4_label **label) 2996 { 2997 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2998 __u32 attrset[3]; 2999 unsigned ret; 3000 unsigned i; 3001 3002 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3003 attrset[i] = opendata->o_res.attrset[i]; 3004 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3005 attrset[i] &= ~bitmask[i]; 3006 } 3007 3008 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3009 sattr->ia_valid : 0; 3010 3011 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3012 if (sattr->ia_valid & ATTR_ATIME_SET) 3013 ret |= ATTR_ATIME_SET; 3014 else 3015 ret |= ATTR_ATIME; 3016 } 3017 3018 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3019 if (sattr->ia_valid & ATTR_MTIME_SET) 3020 ret |= ATTR_MTIME_SET; 3021 else 3022 ret |= ATTR_MTIME; 3023 } 3024 3025 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3026 *label = NULL; 3027 return ret; 3028 } 3029 3030 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3031 struct nfs_open_context *ctx) 3032 { 3033 struct nfs4_state_owner *sp = opendata->owner; 3034 struct nfs_server *server = sp->so_server; 3035 struct dentry *dentry; 3036 struct nfs4_state *state; 3037 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3038 struct inode *dir = d_inode(opendata->dir); 3039 unsigned long dir_verifier; 3040 unsigned int seq; 3041 int ret; 3042 3043 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3044 dir_verifier = nfs_save_change_attribute(dir); 3045 3046 ret = _nfs4_proc_open(opendata, ctx); 3047 if (ret != 0) 3048 goto out; 3049 3050 state = _nfs4_opendata_to_nfs4_state(opendata); 3051 ret = PTR_ERR(state); 3052 if (IS_ERR(state)) 3053 goto out; 3054 ctx->state = state; 3055 if (server->caps & NFS_CAP_POSIX_LOCK) 3056 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3057 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3058 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3059 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3060 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3061 3062 dentry = opendata->dentry; 3063 if (d_really_is_negative(dentry)) { 3064 struct dentry *alias; 3065 d_drop(dentry); 3066 alias = d_exact_alias(dentry, state->inode); 3067 if (!alias) 3068 alias = d_splice_alias(igrab(state->inode), dentry); 3069 /* d_splice_alias() can't fail here - it's a non-directory */ 3070 if (alias) { 3071 dput(ctx->dentry); 3072 ctx->dentry = dentry = alias; 3073 } 3074 } 3075 3076 switch(opendata->o_arg.claim) { 3077 default: 3078 break; 3079 case NFS4_OPEN_CLAIM_NULL: 3080 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3081 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3082 if (!opendata->rpc_done) 3083 break; 3084 if (opendata->o_res.delegation_type != 0) 3085 dir_verifier = nfs_save_change_attribute(dir); 3086 nfs_set_verifier(dentry, dir_verifier); 3087 } 3088 3089 /* Parse layoutget results before we check for access */ 3090 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3091 3092 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3093 if (ret != 0) 3094 goto out; 3095 3096 if (d_inode(dentry) == state->inode) { 3097 nfs_inode_attach_open_context(ctx); 3098 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3099 nfs4_schedule_stateid_recovery(server, state); 3100 } 3101 3102 out: 3103 if (!opendata->cancelled) { 3104 if (opendata->lgp) { 3105 nfs4_lgopen_release(opendata->lgp); 3106 opendata->lgp = NULL; 3107 } 3108 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3109 } 3110 return ret; 3111 } 3112 3113 /* 3114 * Returns a referenced nfs4_state 3115 */ 3116 static int _nfs4_do_open(struct inode *dir, 3117 struct nfs_open_context *ctx, 3118 int flags, 3119 const struct nfs4_open_createattrs *c, 3120 int *opened) 3121 { 3122 struct nfs4_state_owner *sp; 3123 struct nfs4_state *state = NULL; 3124 struct nfs_server *server = NFS_SERVER(dir); 3125 struct nfs4_opendata *opendata; 3126 struct dentry *dentry = ctx->dentry; 3127 const struct cred *cred = ctx->cred; 3128 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3129 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3130 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3131 struct iattr *sattr = c->sattr; 3132 struct nfs4_label *label = c->label; 3133 int status; 3134 3135 /* Protect against reboot recovery conflicts */ 3136 status = -ENOMEM; 3137 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3138 if (sp == NULL) { 3139 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3140 goto out_err; 3141 } 3142 status = nfs4_client_recover_expired_lease(server->nfs_client); 3143 if (status != 0) 3144 goto err_put_state_owner; 3145 if (d_really_is_positive(dentry)) 3146 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3147 status = -ENOMEM; 3148 if (d_really_is_positive(dentry)) 3149 claim = NFS4_OPEN_CLAIM_FH; 3150 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3151 c, claim, GFP_KERNEL); 3152 if (opendata == NULL) 3153 goto err_put_state_owner; 3154 3155 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3156 if (!opendata->f_attr.mdsthreshold) { 3157 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3158 if (!opendata->f_attr.mdsthreshold) 3159 goto err_opendata_put; 3160 } 3161 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3162 } 3163 if (d_really_is_positive(dentry)) 3164 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3165 3166 status = _nfs4_open_and_get_state(opendata, ctx); 3167 if (status != 0) 3168 goto err_opendata_put; 3169 state = ctx->state; 3170 3171 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3172 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3173 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3174 /* 3175 * send create attributes which was not set by open 3176 * with an extra setattr. 3177 */ 3178 if (attrs || label) { 3179 unsigned ia_old = sattr->ia_valid; 3180 3181 sattr->ia_valid = attrs; 3182 nfs_fattr_init(opendata->o_res.f_attr); 3183 status = nfs4_do_setattr(state->inode, cred, 3184 opendata->o_res.f_attr, sattr, 3185 ctx, label); 3186 if (status == 0) { 3187 nfs_setattr_update_inode(state->inode, sattr, 3188 opendata->o_res.f_attr); 3189 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3190 } 3191 sattr->ia_valid = ia_old; 3192 } 3193 } 3194 if (opened && opendata->file_created) 3195 *opened = 1; 3196 3197 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3198 *ctx_th = opendata->f_attr.mdsthreshold; 3199 opendata->f_attr.mdsthreshold = NULL; 3200 } 3201 3202 nfs4_opendata_put(opendata); 3203 nfs4_put_state_owner(sp); 3204 return 0; 3205 err_opendata_put: 3206 nfs4_opendata_put(opendata); 3207 err_put_state_owner: 3208 nfs4_put_state_owner(sp); 3209 out_err: 3210 return status; 3211 } 3212 3213 3214 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3215 struct nfs_open_context *ctx, 3216 int flags, 3217 struct iattr *sattr, 3218 struct nfs4_label *label, 3219 int *opened) 3220 { 3221 struct nfs_server *server = NFS_SERVER(dir); 3222 struct nfs4_exception exception = { 3223 .interruptible = true, 3224 }; 3225 struct nfs4_state *res; 3226 struct nfs4_open_createattrs c = { 3227 .label = label, 3228 .sattr = sattr, 3229 .verf = { 3230 [0] = (__u32)jiffies, 3231 [1] = (__u32)current->pid, 3232 }, 3233 }; 3234 int status; 3235 3236 do { 3237 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3238 res = ctx->state; 3239 trace_nfs4_open_file(ctx, flags, status); 3240 if (status == 0) 3241 break; 3242 /* NOTE: BAD_SEQID means the server and client disagree about the 3243 * book-keeping w.r.t. state-changing operations 3244 * (OPEN/CLOSE/LOCK/LOCKU...) 3245 * It is actually a sign of a bug on the client or on the server. 3246 * 3247 * If we receive a BAD_SEQID error in the particular case of 3248 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3249 * have unhashed the old state_owner for us, and that we can 3250 * therefore safely retry using a new one. We should still warn 3251 * the user though... 3252 */ 3253 if (status == -NFS4ERR_BAD_SEQID) { 3254 pr_warn_ratelimited("NFS: v4 server %s " 3255 " returned a bad sequence-id error!\n", 3256 NFS_SERVER(dir)->nfs_client->cl_hostname); 3257 exception.retry = 1; 3258 continue; 3259 } 3260 /* 3261 * BAD_STATEID on OPEN means that the server cancelled our 3262 * state before it received the OPEN_CONFIRM. 3263 * Recover by retrying the request as per the discussion 3264 * on Page 181 of RFC3530. 3265 */ 3266 if (status == -NFS4ERR_BAD_STATEID) { 3267 exception.retry = 1; 3268 continue; 3269 } 3270 if (status == -NFS4ERR_EXPIRED) { 3271 nfs4_schedule_lease_recovery(server->nfs_client); 3272 exception.retry = 1; 3273 continue; 3274 } 3275 if (status == -EAGAIN) { 3276 /* We must have found a delegation */ 3277 exception.retry = 1; 3278 continue; 3279 } 3280 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3281 continue; 3282 res = ERR_PTR(nfs4_handle_exception(server, 3283 status, &exception)); 3284 } while (exception.retry); 3285 return res; 3286 } 3287 3288 static int _nfs4_do_setattr(struct inode *inode, 3289 struct nfs_setattrargs *arg, 3290 struct nfs_setattrres *res, 3291 const struct cred *cred, 3292 struct nfs_open_context *ctx) 3293 { 3294 struct nfs_server *server = NFS_SERVER(inode); 3295 struct rpc_message msg = { 3296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3297 .rpc_argp = arg, 3298 .rpc_resp = res, 3299 .rpc_cred = cred, 3300 }; 3301 const struct cred *delegation_cred = NULL; 3302 unsigned long timestamp = jiffies; 3303 bool truncate; 3304 int status; 3305 3306 nfs_fattr_init(res->fattr); 3307 3308 /* Servers should only apply open mode checks for file size changes */ 3309 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3310 if (!truncate) { 3311 nfs4_inode_make_writeable(inode); 3312 goto zero_stateid; 3313 } 3314 3315 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3316 /* Use that stateid */ 3317 } else if (ctx != NULL && ctx->state) { 3318 struct nfs_lock_context *l_ctx; 3319 if (!nfs4_valid_open_stateid(ctx->state)) 3320 return -EBADF; 3321 l_ctx = nfs_get_lock_context(ctx); 3322 if (IS_ERR(l_ctx)) 3323 return PTR_ERR(l_ctx); 3324 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3325 &arg->stateid, &delegation_cred); 3326 nfs_put_lock_context(l_ctx); 3327 if (status == -EIO) 3328 return -EBADF; 3329 else if (status == -EAGAIN) 3330 goto zero_stateid; 3331 } else { 3332 zero_stateid: 3333 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3334 } 3335 if (delegation_cred) 3336 msg.rpc_cred = delegation_cred; 3337 3338 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3339 3340 put_cred(delegation_cred); 3341 if (status == 0 && ctx != NULL) 3342 renew_lease(server, timestamp); 3343 trace_nfs4_setattr(inode, &arg->stateid, status); 3344 return status; 3345 } 3346 3347 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3348 struct nfs_fattr *fattr, struct iattr *sattr, 3349 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3350 { 3351 struct nfs_server *server = NFS_SERVER(inode); 3352 __u32 bitmask[NFS4_BITMASK_SZ]; 3353 struct nfs4_state *state = ctx ? ctx->state : NULL; 3354 struct nfs_setattrargs arg = { 3355 .fh = NFS_FH(inode), 3356 .iap = sattr, 3357 .server = server, 3358 .bitmask = bitmask, 3359 .label = ilabel, 3360 }; 3361 struct nfs_setattrres res = { 3362 .fattr = fattr, 3363 .server = server, 3364 }; 3365 struct nfs4_exception exception = { 3366 .state = state, 3367 .inode = inode, 3368 .stateid = &arg.stateid, 3369 }; 3370 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3371 int err; 3372 3373 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3374 adjust_flags |= NFS_INO_INVALID_MODE; 3375 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3376 adjust_flags |= NFS_INO_INVALID_OTHER; 3377 3378 do { 3379 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3380 inode, adjust_flags); 3381 3382 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3383 switch (err) { 3384 case -NFS4ERR_OPENMODE: 3385 if (!(sattr->ia_valid & ATTR_SIZE)) { 3386 pr_warn_once("NFSv4: server %s is incorrectly " 3387 "applying open mode checks to " 3388 "a SETATTR that is not " 3389 "changing file size.\n", 3390 server->nfs_client->cl_hostname); 3391 } 3392 if (state && !(state->state & FMODE_WRITE)) { 3393 err = -EBADF; 3394 if (sattr->ia_valid & ATTR_OPEN) 3395 err = -EACCES; 3396 goto out; 3397 } 3398 } 3399 err = nfs4_handle_exception(server, err, &exception); 3400 } while (exception.retry); 3401 out: 3402 return err; 3403 } 3404 3405 static bool 3406 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3407 { 3408 if (inode == NULL || !nfs_have_layout(inode)) 3409 return false; 3410 3411 return pnfs_wait_on_layoutreturn(inode, task); 3412 } 3413 3414 /* 3415 * Update the seqid of an open stateid 3416 */ 3417 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3418 struct nfs4_state *state) 3419 { 3420 __be32 seqid_open; 3421 u32 dst_seqid; 3422 int seq; 3423 3424 for (;;) { 3425 if (!nfs4_valid_open_stateid(state)) 3426 break; 3427 seq = read_seqbegin(&state->seqlock); 3428 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3429 nfs4_stateid_copy(dst, &state->open_stateid); 3430 if (read_seqretry(&state->seqlock, seq)) 3431 continue; 3432 break; 3433 } 3434 seqid_open = state->open_stateid.seqid; 3435 if (read_seqretry(&state->seqlock, seq)) 3436 continue; 3437 3438 dst_seqid = be32_to_cpu(dst->seqid); 3439 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3440 dst->seqid = seqid_open; 3441 break; 3442 } 3443 } 3444 3445 /* 3446 * Update the seqid of an open stateid after receiving 3447 * NFS4ERR_OLD_STATEID 3448 */ 3449 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3450 struct nfs4_state *state) 3451 { 3452 __be32 seqid_open; 3453 u32 dst_seqid; 3454 bool ret; 3455 int seq, status = -EAGAIN; 3456 DEFINE_WAIT(wait); 3457 3458 for (;;) { 3459 ret = false; 3460 if (!nfs4_valid_open_stateid(state)) 3461 break; 3462 seq = read_seqbegin(&state->seqlock); 3463 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3464 if (read_seqretry(&state->seqlock, seq)) 3465 continue; 3466 break; 3467 } 3468 3469 write_seqlock(&state->seqlock); 3470 seqid_open = state->open_stateid.seqid; 3471 3472 dst_seqid = be32_to_cpu(dst->seqid); 3473 3474 /* Did another OPEN bump the state's seqid? try again: */ 3475 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3476 dst->seqid = seqid_open; 3477 write_sequnlock(&state->seqlock); 3478 ret = true; 3479 break; 3480 } 3481 3482 /* server says we're behind but we haven't seen the update yet */ 3483 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3484 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3485 write_sequnlock(&state->seqlock); 3486 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3487 3488 if (fatal_signal_pending(current)) 3489 status = -EINTR; 3490 else 3491 if (schedule_timeout(5*HZ) != 0) 3492 status = 0; 3493 3494 finish_wait(&state->waitq, &wait); 3495 3496 if (!status) 3497 continue; 3498 if (status == -EINTR) 3499 break; 3500 3501 /* we slept the whole 5 seconds, we must have lost a seqid */ 3502 dst->seqid = cpu_to_be32(dst_seqid + 1); 3503 ret = true; 3504 break; 3505 } 3506 3507 return ret; 3508 } 3509 3510 struct nfs4_closedata { 3511 struct inode *inode; 3512 struct nfs4_state *state; 3513 struct nfs_closeargs arg; 3514 struct nfs_closeres res; 3515 struct { 3516 struct nfs4_layoutreturn_args arg; 3517 struct nfs4_layoutreturn_res res; 3518 struct nfs4_xdr_opaque_data ld_private; 3519 u32 roc_barrier; 3520 bool roc; 3521 } lr; 3522 struct nfs_fattr fattr; 3523 unsigned long timestamp; 3524 }; 3525 3526 static void nfs4_free_closedata(void *data) 3527 { 3528 struct nfs4_closedata *calldata = data; 3529 struct nfs4_state_owner *sp = calldata->state->owner; 3530 struct super_block *sb = calldata->state->inode->i_sb; 3531 3532 if (calldata->lr.roc) 3533 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3534 calldata->res.lr_ret); 3535 nfs4_put_open_state(calldata->state); 3536 nfs_free_seqid(calldata->arg.seqid); 3537 nfs4_put_state_owner(sp); 3538 nfs_sb_deactive(sb); 3539 kfree(calldata); 3540 } 3541 3542 static void nfs4_close_done(struct rpc_task *task, void *data) 3543 { 3544 struct nfs4_closedata *calldata = data; 3545 struct nfs4_state *state = calldata->state; 3546 struct nfs_server *server = NFS_SERVER(calldata->inode); 3547 nfs4_stateid *res_stateid = NULL; 3548 struct nfs4_exception exception = { 3549 .state = state, 3550 .inode = calldata->inode, 3551 .stateid = &calldata->arg.stateid, 3552 }; 3553 3554 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3555 return; 3556 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3557 3558 /* Handle Layoutreturn errors */ 3559 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3560 &calldata->res.lr_ret) == -EAGAIN) 3561 goto out_restart; 3562 3563 /* hmm. we are done with the inode, and in the process of freeing 3564 * the state_owner. we keep this around to process errors 3565 */ 3566 switch (task->tk_status) { 3567 case 0: 3568 res_stateid = &calldata->res.stateid; 3569 renew_lease(server, calldata->timestamp); 3570 break; 3571 case -NFS4ERR_ACCESS: 3572 if (calldata->arg.bitmask != NULL) { 3573 calldata->arg.bitmask = NULL; 3574 calldata->res.fattr = NULL; 3575 goto out_restart; 3576 3577 } 3578 break; 3579 case -NFS4ERR_OLD_STATEID: 3580 /* Did we race with OPEN? */ 3581 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3582 state)) 3583 goto out_restart; 3584 goto out_release; 3585 case -NFS4ERR_ADMIN_REVOKED: 3586 case -NFS4ERR_STALE_STATEID: 3587 case -NFS4ERR_EXPIRED: 3588 nfs4_free_revoked_stateid(server, 3589 &calldata->arg.stateid, 3590 task->tk_msg.rpc_cred); 3591 fallthrough; 3592 case -NFS4ERR_BAD_STATEID: 3593 if (calldata->arg.fmode == 0) 3594 break; 3595 fallthrough; 3596 default: 3597 task->tk_status = nfs4_async_handle_exception(task, 3598 server, task->tk_status, &exception); 3599 if (exception.retry) 3600 goto out_restart; 3601 } 3602 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3603 res_stateid, calldata->arg.fmode); 3604 out_release: 3605 task->tk_status = 0; 3606 nfs_release_seqid(calldata->arg.seqid); 3607 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3608 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3609 return; 3610 out_restart: 3611 task->tk_status = 0; 3612 rpc_restart_call_prepare(task); 3613 goto out_release; 3614 } 3615 3616 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3617 { 3618 struct nfs4_closedata *calldata = data; 3619 struct nfs4_state *state = calldata->state; 3620 struct inode *inode = calldata->inode; 3621 struct nfs_server *server = NFS_SERVER(inode); 3622 struct pnfs_layout_hdr *lo; 3623 bool is_rdonly, is_wronly, is_rdwr; 3624 int call_close = 0; 3625 3626 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3627 goto out_wait; 3628 3629 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3630 spin_lock(&state->owner->so_lock); 3631 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3632 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3633 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3634 /* Calculate the change in open mode */ 3635 calldata->arg.fmode = 0; 3636 if (state->n_rdwr == 0) { 3637 if (state->n_rdonly == 0) 3638 call_close |= is_rdonly; 3639 else if (is_rdonly) 3640 calldata->arg.fmode |= FMODE_READ; 3641 if (state->n_wronly == 0) 3642 call_close |= is_wronly; 3643 else if (is_wronly) 3644 calldata->arg.fmode |= FMODE_WRITE; 3645 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3646 call_close |= is_rdwr; 3647 } else if (is_rdwr) 3648 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3649 3650 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3651 if (!nfs4_valid_open_stateid(state)) 3652 call_close = 0; 3653 spin_unlock(&state->owner->so_lock); 3654 3655 if (!call_close) { 3656 /* Note: exit _without_ calling nfs4_close_done */ 3657 goto out_no_action; 3658 } 3659 3660 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3661 nfs_release_seqid(calldata->arg.seqid); 3662 goto out_wait; 3663 } 3664 3665 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3666 if (lo && !pnfs_layout_is_valid(lo)) { 3667 calldata->arg.lr_args = NULL; 3668 calldata->res.lr_res = NULL; 3669 } 3670 3671 if (calldata->arg.fmode == 0) 3672 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3673 3674 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3675 /* Close-to-open cache consistency revalidation */ 3676 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3677 nfs4_bitmask_set(calldata->arg.bitmask_store, 3678 server->cache_consistency_bitmask, 3679 inode, 0); 3680 calldata->arg.bitmask = calldata->arg.bitmask_store; 3681 } else 3682 calldata->arg.bitmask = NULL; 3683 } 3684 3685 calldata->arg.share_access = 3686 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3687 calldata->arg.fmode, 0); 3688 3689 if (calldata->res.fattr == NULL) 3690 calldata->arg.bitmask = NULL; 3691 else if (calldata->arg.bitmask == NULL) 3692 calldata->res.fattr = NULL; 3693 calldata->timestamp = jiffies; 3694 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3695 &calldata->arg.seq_args, 3696 &calldata->res.seq_res, 3697 task) != 0) 3698 nfs_release_seqid(calldata->arg.seqid); 3699 return; 3700 out_no_action: 3701 task->tk_action = NULL; 3702 out_wait: 3703 nfs4_sequence_done(task, &calldata->res.seq_res); 3704 } 3705 3706 static const struct rpc_call_ops nfs4_close_ops = { 3707 .rpc_call_prepare = nfs4_close_prepare, 3708 .rpc_call_done = nfs4_close_done, 3709 .rpc_release = nfs4_free_closedata, 3710 }; 3711 3712 /* 3713 * It is possible for data to be read/written from a mem-mapped file 3714 * after the sys_close call (which hits the vfs layer as a flush). 3715 * This means that we can't safely call nfsv4 close on a file until 3716 * the inode is cleared. This in turn means that we are not good 3717 * NFSv4 citizens - we do not indicate to the server to update the file's 3718 * share state even when we are done with one of the three share 3719 * stateid's in the inode. 3720 * 3721 * NOTE: Caller must be holding the sp->so_owner semaphore! 3722 */ 3723 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3724 { 3725 struct nfs_server *server = NFS_SERVER(state->inode); 3726 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3727 struct nfs4_closedata *calldata; 3728 struct nfs4_state_owner *sp = state->owner; 3729 struct rpc_task *task; 3730 struct rpc_message msg = { 3731 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3732 .rpc_cred = state->owner->so_cred, 3733 }; 3734 struct rpc_task_setup task_setup_data = { 3735 .rpc_client = server->client, 3736 .rpc_message = &msg, 3737 .callback_ops = &nfs4_close_ops, 3738 .workqueue = nfsiod_workqueue, 3739 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3740 }; 3741 int status = -ENOMEM; 3742 3743 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3744 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3745 3746 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3747 &task_setup_data.rpc_client, &msg); 3748 3749 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3750 if (calldata == NULL) 3751 goto out; 3752 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3753 calldata->inode = state->inode; 3754 calldata->state = state; 3755 calldata->arg.fh = NFS_FH(state->inode); 3756 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3757 goto out_free_calldata; 3758 /* Serialization for the sequence id */ 3759 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3760 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3761 if (IS_ERR(calldata->arg.seqid)) 3762 goto out_free_calldata; 3763 nfs_fattr_init(&calldata->fattr); 3764 calldata->arg.fmode = 0; 3765 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3766 calldata->res.fattr = &calldata->fattr; 3767 calldata->res.seqid = calldata->arg.seqid; 3768 calldata->res.server = server; 3769 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3770 calldata->lr.roc = pnfs_roc(state->inode, 3771 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3772 if (calldata->lr.roc) { 3773 calldata->arg.lr_args = &calldata->lr.arg; 3774 calldata->res.lr_res = &calldata->lr.res; 3775 } 3776 nfs_sb_active(calldata->inode->i_sb); 3777 3778 msg.rpc_argp = &calldata->arg; 3779 msg.rpc_resp = &calldata->res; 3780 task_setup_data.callback_data = calldata; 3781 task = rpc_run_task(&task_setup_data); 3782 if (IS_ERR(task)) 3783 return PTR_ERR(task); 3784 status = 0; 3785 if (wait) 3786 status = rpc_wait_for_completion_task(task); 3787 rpc_put_task(task); 3788 return status; 3789 out_free_calldata: 3790 kfree(calldata); 3791 out: 3792 nfs4_put_open_state(state); 3793 nfs4_put_state_owner(sp); 3794 return status; 3795 } 3796 3797 static struct inode * 3798 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3799 int open_flags, struct iattr *attr, int *opened) 3800 { 3801 struct nfs4_state *state; 3802 struct nfs4_label l, *label; 3803 3804 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3805 3806 /* Protect against concurrent sillydeletes */ 3807 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3808 3809 nfs4_label_release_security(label); 3810 3811 if (IS_ERR(state)) 3812 return ERR_CAST(state); 3813 return state->inode; 3814 } 3815 3816 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3817 { 3818 if (ctx->state == NULL) 3819 return; 3820 if (is_sync) 3821 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3822 else 3823 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3824 } 3825 3826 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3827 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3828 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3829 3830 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3831 { 3832 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3833 struct nfs4_server_caps_arg args = { 3834 .fhandle = fhandle, 3835 .bitmask = bitmask, 3836 }; 3837 struct nfs4_server_caps_res res = {}; 3838 struct rpc_message msg = { 3839 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3840 .rpc_argp = &args, 3841 .rpc_resp = &res, 3842 }; 3843 int status; 3844 int i; 3845 3846 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3847 FATTR4_WORD0_FH_EXPIRE_TYPE | 3848 FATTR4_WORD0_LINK_SUPPORT | 3849 FATTR4_WORD0_SYMLINK_SUPPORT | 3850 FATTR4_WORD0_ACLSUPPORT | 3851 FATTR4_WORD0_CASE_INSENSITIVE | 3852 FATTR4_WORD0_CASE_PRESERVING; 3853 if (minorversion) 3854 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3855 3856 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3857 if (status == 0) { 3858 /* Sanity check the server answers */ 3859 switch (minorversion) { 3860 case 0: 3861 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3862 res.attr_bitmask[2] = 0; 3863 break; 3864 case 1: 3865 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3866 break; 3867 case 2: 3868 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3869 } 3870 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3871 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3872 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3873 server->fattr_valid = NFS_ATTR_FATTR_V4; 3874 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3875 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3876 server->caps |= NFS_CAP_ACLS; 3877 if (res.has_links != 0) 3878 server->caps |= NFS_CAP_HARDLINKS; 3879 if (res.has_symlinks != 0) 3880 server->caps |= NFS_CAP_SYMLINKS; 3881 if (res.case_insensitive) 3882 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3883 if (res.case_preserving) 3884 server->caps |= NFS_CAP_CASE_PRESERVING; 3885 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3886 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3887 server->caps |= NFS_CAP_SECURITY_LABEL; 3888 #endif 3889 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3890 server->caps |= NFS_CAP_FS_LOCATIONS; 3891 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3892 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3893 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3894 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3895 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3896 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3897 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3898 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3899 NFS_ATTR_FATTR_OWNER_NAME); 3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3901 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3902 NFS_ATTR_FATTR_GROUP_NAME); 3903 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3904 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3905 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3906 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3907 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3908 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3909 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3910 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3911 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3912 sizeof(server->attr_bitmask)); 3913 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3914 3915 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3916 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3917 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3918 server->cache_consistency_bitmask[2] = 0; 3919 3920 /* Avoid a regression due to buggy server */ 3921 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3922 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3923 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3924 sizeof(server->exclcreat_bitmask)); 3925 3926 server->acl_bitmask = res.acl_bitmask; 3927 server->fh_expire_type = res.fh_expire_type; 3928 } 3929 3930 return status; 3931 } 3932 3933 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3934 { 3935 struct nfs4_exception exception = { 3936 .interruptible = true, 3937 }; 3938 int err; 3939 3940 nfs4_server_set_init_caps(server); 3941 do { 3942 err = nfs4_handle_exception(server, 3943 _nfs4_server_capabilities(server, fhandle), 3944 &exception); 3945 } while (exception.retry); 3946 return err; 3947 } 3948 3949 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3950 struct nfs_client *clp, 3951 struct nfs_server *server) 3952 { 3953 int i; 3954 3955 for (i = 0; i < location->nservers; i++) { 3956 struct nfs4_string *srv_loc = &location->servers[i]; 3957 struct sockaddr_storage addr; 3958 size_t addrlen; 3959 struct xprt_create xprt_args = { 3960 .ident = 0, 3961 .net = clp->cl_net, 3962 }; 3963 struct nfs4_add_xprt_data xprtdata = { 3964 .clp = clp, 3965 }; 3966 struct rpc_add_xprt_test rpcdata = { 3967 .add_xprt_test = clp->cl_mvops->session_trunk, 3968 .data = &xprtdata, 3969 }; 3970 char *servername = NULL; 3971 3972 if (!srv_loc->len) 3973 continue; 3974 3975 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3976 &addr, sizeof(addr), 3977 clp->cl_net, server->port); 3978 if (!addrlen) 3979 return; 3980 xprt_args.dstaddr = (struct sockaddr *)&addr; 3981 xprt_args.addrlen = addrlen; 3982 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3983 if (!servername) 3984 return; 3985 memcpy(servername, srv_loc->data, srv_loc->len); 3986 servername[srv_loc->len] = '\0'; 3987 xprt_args.servername = servername; 3988 3989 xprtdata.cred = nfs4_get_clid_cred(clp); 3990 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3991 rpc_clnt_setup_test_and_add_xprt, 3992 &rpcdata); 3993 if (xprtdata.cred) 3994 put_cred(xprtdata.cred); 3995 kfree(servername); 3996 } 3997 } 3998 3999 static int _nfs4_discover_trunking(struct nfs_server *server, 4000 struct nfs_fh *fhandle) 4001 { 4002 struct nfs4_fs_locations *locations = NULL; 4003 struct page *page; 4004 const struct cred *cred; 4005 struct nfs_client *clp = server->nfs_client; 4006 const struct nfs4_state_maintenance_ops *ops = 4007 clp->cl_mvops->state_renewal_ops; 4008 int status = -ENOMEM, i; 4009 4010 cred = ops->get_state_renewal_cred(clp); 4011 if (cred == NULL) { 4012 cred = nfs4_get_clid_cred(clp); 4013 if (cred == NULL) 4014 return -ENOKEY; 4015 } 4016 4017 page = alloc_page(GFP_KERNEL); 4018 if (!page) 4019 goto out_put_cred; 4020 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4021 if (!locations) 4022 goto out_free; 4023 locations->fattr = nfs_alloc_fattr(); 4024 if (!locations->fattr) 4025 goto out_free_2; 4026 4027 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4028 cred); 4029 if (status) 4030 goto out_free_3; 4031 4032 for (i = 0; i < locations->nlocations; i++) 4033 test_fs_location_for_trunking(&locations->locations[i], clp, 4034 server); 4035 out_free_3: 4036 kfree(locations->fattr); 4037 out_free_2: 4038 kfree(locations); 4039 out_free: 4040 __free_page(page); 4041 out_put_cred: 4042 put_cred(cred); 4043 return status; 4044 } 4045 4046 static int nfs4_discover_trunking(struct nfs_server *server, 4047 struct nfs_fh *fhandle) 4048 { 4049 struct nfs4_exception exception = { 4050 .interruptible = true, 4051 }; 4052 struct nfs_client *clp = server->nfs_client; 4053 int err = 0; 4054 4055 if (!nfs4_has_session(clp)) 4056 goto out; 4057 do { 4058 err = nfs4_handle_exception(server, 4059 _nfs4_discover_trunking(server, fhandle), 4060 &exception); 4061 } while (exception.retry); 4062 out: 4063 return err; 4064 } 4065 4066 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4067 struct nfs_fsinfo *info) 4068 { 4069 u32 bitmask[3]; 4070 struct nfs4_lookup_root_arg args = { 4071 .bitmask = bitmask, 4072 }; 4073 struct nfs4_lookup_res res = { 4074 .server = server, 4075 .fattr = info->fattr, 4076 .fh = fhandle, 4077 }; 4078 struct rpc_message msg = { 4079 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4080 .rpc_argp = &args, 4081 .rpc_resp = &res, 4082 }; 4083 4084 bitmask[0] = nfs4_fattr_bitmap[0]; 4085 bitmask[1] = nfs4_fattr_bitmap[1]; 4086 /* 4087 * Process the label in the upcoming getfattr 4088 */ 4089 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4090 4091 nfs_fattr_init(info->fattr); 4092 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4093 } 4094 4095 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4096 struct nfs_fsinfo *info) 4097 { 4098 struct nfs4_exception exception = { 4099 .interruptible = true, 4100 }; 4101 int err; 4102 do { 4103 err = _nfs4_lookup_root(server, fhandle, info); 4104 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4105 switch (err) { 4106 case 0: 4107 case -NFS4ERR_WRONGSEC: 4108 goto out; 4109 default: 4110 err = nfs4_handle_exception(server, err, &exception); 4111 } 4112 } while (exception.retry); 4113 out: 4114 return err; 4115 } 4116 4117 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4118 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4119 { 4120 struct rpc_auth_create_args auth_args = { 4121 .pseudoflavor = flavor, 4122 }; 4123 struct rpc_auth *auth; 4124 4125 auth = rpcauth_create(&auth_args, server->client); 4126 if (IS_ERR(auth)) 4127 return -EACCES; 4128 return nfs4_lookup_root(server, fhandle, info); 4129 } 4130 4131 /* 4132 * Retry pseudoroot lookup with various security flavors. We do this when: 4133 * 4134 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4135 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4136 * 4137 * Returns zero on success, or a negative NFS4ERR value, or a 4138 * negative errno value. 4139 */ 4140 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4141 struct nfs_fsinfo *info) 4142 { 4143 /* Per 3530bis 15.33.5 */ 4144 static const rpc_authflavor_t flav_array[] = { 4145 RPC_AUTH_GSS_KRB5P, 4146 RPC_AUTH_GSS_KRB5I, 4147 RPC_AUTH_GSS_KRB5, 4148 RPC_AUTH_UNIX, /* courtesy */ 4149 RPC_AUTH_NULL, 4150 }; 4151 int status = -EPERM; 4152 size_t i; 4153 4154 if (server->auth_info.flavor_len > 0) { 4155 /* try each flavor specified by user */ 4156 for (i = 0; i < server->auth_info.flavor_len; i++) { 4157 status = nfs4_lookup_root_sec(server, fhandle, info, 4158 server->auth_info.flavors[i]); 4159 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4160 continue; 4161 break; 4162 } 4163 } else { 4164 /* no flavors specified by user, try default list */ 4165 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4166 status = nfs4_lookup_root_sec(server, fhandle, info, 4167 flav_array[i]); 4168 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4169 continue; 4170 break; 4171 } 4172 } 4173 4174 /* 4175 * -EACCES could mean that the user doesn't have correct permissions 4176 * to access the mount. It could also mean that we tried to mount 4177 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4178 * existing mount programs don't handle -EACCES very well so it should 4179 * be mapped to -EPERM instead. 4180 */ 4181 if (status == -EACCES) 4182 status = -EPERM; 4183 return status; 4184 } 4185 4186 /** 4187 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4188 * @server: initialized nfs_server handle 4189 * @fhandle: we fill in the pseudo-fs root file handle 4190 * @info: we fill in an FSINFO struct 4191 * @auth_probe: probe the auth flavours 4192 * 4193 * Returns zero on success, or a negative errno. 4194 */ 4195 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4196 struct nfs_fsinfo *info, 4197 bool auth_probe) 4198 { 4199 int status = 0; 4200 4201 if (!auth_probe) 4202 status = nfs4_lookup_root(server, fhandle, info); 4203 4204 if (auth_probe || status == NFS4ERR_WRONGSEC) 4205 status = server->nfs_client->cl_mvops->find_root_sec(server, 4206 fhandle, info); 4207 4208 if (status == 0) 4209 status = nfs4_server_capabilities(server, fhandle); 4210 if (status == 0) 4211 status = nfs4_do_fsinfo(server, fhandle, info); 4212 4213 return nfs4_map_errors(status); 4214 } 4215 4216 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4217 struct nfs_fsinfo *info) 4218 { 4219 int error; 4220 struct nfs_fattr *fattr = info->fattr; 4221 4222 error = nfs4_server_capabilities(server, mntfh); 4223 if (error < 0) { 4224 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4225 return error; 4226 } 4227 4228 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4229 if (error < 0) { 4230 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4231 goto out; 4232 } 4233 4234 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4235 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4236 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4237 4238 out: 4239 return error; 4240 } 4241 4242 /* 4243 * Get locations and (maybe) other attributes of a referral. 4244 * Note that we'll actually follow the referral later when 4245 * we detect fsid mismatch in inode revalidation 4246 */ 4247 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4248 const struct qstr *name, struct nfs_fattr *fattr, 4249 struct nfs_fh *fhandle) 4250 { 4251 int status = -ENOMEM; 4252 struct page *page = NULL; 4253 struct nfs4_fs_locations *locations = NULL; 4254 4255 page = alloc_page(GFP_KERNEL); 4256 if (page == NULL) 4257 goto out; 4258 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4259 if (locations == NULL) 4260 goto out; 4261 4262 locations->fattr = fattr; 4263 4264 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4265 if (status != 0) 4266 goto out; 4267 4268 /* 4269 * If the fsid didn't change, this is a migration event, not a 4270 * referral. Cause us to drop into the exception handler, which 4271 * will kick off migration recovery. 4272 */ 4273 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4274 dprintk("%s: server did not return a different fsid for" 4275 " a referral at %s\n", __func__, name->name); 4276 status = -NFS4ERR_MOVED; 4277 goto out; 4278 } 4279 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4280 nfs_fixup_referral_attributes(fattr); 4281 memset(fhandle, 0, sizeof(struct nfs_fh)); 4282 out: 4283 if (page) 4284 __free_page(page); 4285 kfree(locations); 4286 return status; 4287 } 4288 4289 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4290 struct nfs_fattr *fattr, struct inode *inode) 4291 { 4292 __u32 bitmask[NFS4_BITMASK_SZ]; 4293 struct nfs4_getattr_arg args = { 4294 .fh = fhandle, 4295 .bitmask = bitmask, 4296 }; 4297 struct nfs4_getattr_res res = { 4298 .fattr = fattr, 4299 .server = server, 4300 }; 4301 struct rpc_message msg = { 4302 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4303 .rpc_argp = &args, 4304 .rpc_resp = &res, 4305 }; 4306 unsigned short task_flags = 0; 4307 4308 if (nfs4_has_session(server->nfs_client)) 4309 task_flags = RPC_TASK_MOVEABLE; 4310 4311 /* Is this is an attribute revalidation, subject to softreval? */ 4312 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4313 task_flags |= RPC_TASK_TIMEOUT; 4314 4315 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4316 nfs_fattr_init(fattr); 4317 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4318 return nfs4_do_call_sync(server->client, server, &msg, 4319 &args.seq_args, &res.seq_res, task_flags); 4320 } 4321 4322 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4323 struct nfs_fattr *fattr, struct inode *inode) 4324 { 4325 struct nfs4_exception exception = { 4326 .interruptible = true, 4327 }; 4328 int err; 4329 do { 4330 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4331 trace_nfs4_getattr(server, fhandle, fattr, err); 4332 err = nfs4_handle_exception(server, err, 4333 &exception); 4334 } while (exception.retry); 4335 return err; 4336 } 4337 4338 /* 4339 * The file is not closed if it is opened due to the a request to change 4340 * the size of the file. The open call will not be needed once the 4341 * VFS layer lookup-intents are implemented. 4342 * 4343 * Close is called when the inode is destroyed. 4344 * If we haven't opened the file for O_WRONLY, we 4345 * need to in the size_change case to obtain a stateid. 4346 * 4347 * Got race? 4348 * Because OPEN is always done by name in nfsv4, it is 4349 * possible that we opened a different file by the same 4350 * name. We can recognize this race condition, but we 4351 * can't do anything about it besides returning an error. 4352 * 4353 * This will be fixed with VFS changes (lookup-intent). 4354 */ 4355 static int 4356 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4357 struct iattr *sattr) 4358 { 4359 struct inode *inode = d_inode(dentry); 4360 const struct cred *cred = NULL; 4361 struct nfs_open_context *ctx = NULL; 4362 int status; 4363 4364 if (pnfs_ld_layoutret_on_setattr(inode) && 4365 sattr->ia_valid & ATTR_SIZE && 4366 sattr->ia_size < i_size_read(inode)) 4367 pnfs_commit_and_return_layout(inode); 4368 4369 nfs_fattr_init(fattr); 4370 4371 /* Deal with open(O_TRUNC) */ 4372 if (sattr->ia_valid & ATTR_OPEN) 4373 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4374 4375 /* Optimization: if the end result is no change, don't RPC */ 4376 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4377 return 0; 4378 4379 /* Search for an existing open(O_WRITE) file */ 4380 if (sattr->ia_valid & ATTR_FILE) { 4381 4382 ctx = nfs_file_open_context(sattr->ia_file); 4383 if (ctx) 4384 cred = ctx->cred; 4385 } 4386 4387 /* Return any delegations if we're going to change ACLs */ 4388 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4389 nfs4_inode_make_writeable(inode); 4390 4391 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4392 if (status == 0) { 4393 nfs_setattr_update_inode(inode, sattr, fattr); 4394 nfs_setsecurity(inode, fattr); 4395 } 4396 return status; 4397 } 4398 4399 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4400 struct dentry *dentry, struct nfs_fh *fhandle, 4401 struct nfs_fattr *fattr) 4402 { 4403 struct nfs_server *server = NFS_SERVER(dir); 4404 int status; 4405 struct nfs4_lookup_arg args = { 4406 .bitmask = server->attr_bitmask, 4407 .dir_fh = NFS_FH(dir), 4408 .name = &dentry->d_name, 4409 }; 4410 struct nfs4_lookup_res res = { 4411 .server = server, 4412 .fattr = fattr, 4413 .fh = fhandle, 4414 }; 4415 struct rpc_message msg = { 4416 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4417 .rpc_argp = &args, 4418 .rpc_resp = &res, 4419 }; 4420 unsigned short task_flags = 0; 4421 4422 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4423 task_flags = RPC_TASK_MOVEABLE; 4424 4425 /* Is this is an attribute revalidation, subject to softreval? */ 4426 if (nfs_lookup_is_soft_revalidate(dentry)) 4427 task_flags |= RPC_TASK_TIMEOUT; 4428 4429 args.bitmask = nfs4_bitmask(server, fattr->label); 4430 4431 nfs_fattr_init(fattr); 4432 4433 dprintk("NFS call lookup %pd2\n", dentry); 4434 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4435 status = nfs4_do_call_sync(clnt, server, &msg, 4436 &args.seq_args, &res.seq_res, task_flags); 4437 dprintk("NFS reply lookup: %d\n", status); 4438 return status; 4439 } 4440 4441 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4442 { 4443 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4444 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4445 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4446 fattr->nlink = 2; 4447 } 4448 4449 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4450 struct dentry *dentry, struct nfs_fh *fhandle, 4451 struct nfs_fattr *fattr) 4452 { 4453 struct nfs4_exception exception = { 4454 .interruptible = true, 4455 }; 4456 struct rpc_clnt *client = *clnt; 4457 const struct qstr *name = &dentry->d_name; 4458 int err; 4459 do { 4460 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4461 trace_nfs4_lookup(dir, name, err); 4462 switch (err) { 4463 case -NFS4ERR_BADNAME: 4464 err = -ENOENT; 4465 goto out; 4466 case -NFS4ERR_MOVED: 4467 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4468 if (err == -NFS4ERR_MOVED) 4469 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4470 goto out; 4471 case -NFS4ERR_WRONGSEC: 4472 err = -EPERM; 4473 if (client != *clnt) 4474 goto out; 4475 client = nfs4_negotiate_security(client, dir, name); 4476 if (IS_ERR(client)) 4477 return PTR_ERR(client); 4478 4479 exception.retry = 1; 4480 break; 4481 default: 4482 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4483 } 4484 } while (exception.retry); 4485 4486 out: 4487 if (err == 0) 4488 *clnt = client; 4489 else if (client != *clnt) 4490 rpc_shutdown_client(client); 4491 4492 return err; 4493 } 4494 4495 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4496 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4497 { 4498 int status; 4499 struct rpc_clnt *client = NFS_CLIENT(dir); 4500 4501 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4502 if (client != NFS_CLIENT(dir)) { 4503 rpc_shutdown_client(client); 4504 nfs_fixup_secinfo_attributes(fattr); 4505 } 4506 return status; 4507 } 4508 4509 struct rpc_clnt * 4510 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4511 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4512 { 4513 struct rpc_clnt *client = NFS_CLIENT(dir); 4514 int status; 4515 4516 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4517 if (status < 0) 4518 return ERR_PTR(status); 4519 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4520 } 4521 4522 static int _nfs4_proc_lookupp(struct inode *inode, 4523 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4524 { 4525 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4526 struct nfs_server *server = NFS_SERVER(inode); 4527 int status; 4528 struct nfs4_lookupp_arg args = { 4529 .bitmask = server->attr_bitmask, 4530 .fh = NFS_FH(inode), 4531 }; 4532 struct nfs4_lookupp_res res = { 4533 .server = server, 4534 .fattr = fattr, 4535 .fh = fhandle, 4536 }; 4537 struct rpc_message msg = { 4538 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4539 .rpc_argp = &args, 4540 .rpc_resp = &res, 4541 }; 4542 unsigned short task_flags = 0; 4543 4544 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4545 task_flags |= RPC_TASK_TIMEOUT; 4546 4547 args.bitmask = nfs4_bitmask(server, fattr->label); 4548 4549 nfs_fattr_init(fattr); 4550 4551 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4552 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4553 &res.seq_res, task_flags); 4554 dprintk("NFS reply lookupp: %d\n", status); 4555 return status; 4556 } 4557 4558 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4559 struct nfs_fattr *fattr) 4560 { 4561 struct nfs4_exception exception = { 4562 .interruptible = true, 4563 }; 4564 int err; 4565 do { 4566 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4567 trace_nfs4_lookupp(inode, err); 4568 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4569 &exception); 4570 } while (exception.retry); 4571 return err; 4572 } 4573 4574 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4575 const struct cred *cred) 4576 { 4577 struct nfs_server *server = NFS_SERVER(inode); 4578 struct nfs4_accessargs args = { 4579 .fh = NFS_FH(inode), 4580 .access = entry->mask, 4581 }; 4582 struct nfs4_accessres res = { 4583 .server = server, 4584 }; 4585 struct rpc_message msg = { 4586 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4587 .rpc_argp = &args, 4588 .rpc_resp = &res, 4589 .rpc_cred = cred, 4590 }; 4591 int status = 0; 4592 4593 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4594 res.fattr = nfs_alloc_fattr(); 4595 if (res.fattr == NULL) 4596 return -ENOMEM; 4597 args.bitmask = server->cache_consistency_bitmask; 4598 } 4599 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4600 if (!status) { 4601 nfs_access_set_mask(entry, res.access); 4602 if (res.fattr) 4603 nfs_refresh_inode(inode, res.fattr); 4604 } 4605 nfs_free_fattr(res.fattr); 4606 return status; 4607 } 4608 4609 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4610 const struct cred *cred) 4611 { 4612 struct nfs4_exception exception = { 4613 .interruptible = true, 4614 }; 4615 int err; 4616 do { 4617 err = _nfs4_proc_access(inode, entry, cred); 4618 trace_nfs4_access(inode, err); 4619 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4620 &exception); 4621 } while (exception.retry); 4622 return err; 4623 } 4624 4625 /* 4626 * TODO: For the time being, we don't try to get any attributes 4627 * along with any of the zero-copy operations READ, READDIR, 4628 * READLINK, WRITE. 4629 * 4630 * In the case of the first three, we want to put the GETATTR 4631 * after the read-type operation -- this is because it is hard 4632 * to predict the length of a GETATTR response in v4, and thus 4633 * align the READ data correctly. This means that the GETATTR 4634 * may end up partially falling into the page cache, and we should 4635 * shift it into the 'tail' of the xdr_buf before processing. 4636 * To do this efficiently, we need to know the total length 4637 * of data received, which doesn't seem to be available outside 4638 * of the RPC layer. 4639 * 4640 * In the case of WRITE, we also want to put the GETATTR after 4641 * the operation -- in this case because we want to make sure 4642 * we get the post-operation mtime and size. 4643 * 4644 * Both of these changes to the XDR layer would in fact be quite 4645 * minor, but I decided to leave them for a subsequent patch. 4646 */ 4647 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4648 unsigned int pgbase, unsigned int pglen) 4649 { 4650 struct nfs4_readlink args = { 4651 .fh = NFS_FH(inode), 4652 .pgbase = pgbase, 4653 .pglen = pglen, 4654 .pages = &page, 4655 }; 4656 struct nfs4_readlink_res res; 4657 struct rpc_message msg = { 4658 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4659 .rpc_argp = &args, 4660 .rpc_resp = &res, 4661 }; 4662 4663 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4664 } 4665 4666 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4667 unsigned int pgbase, unsigned int pglen) 4668 { 4669 struct nfs4_exception exception = { 4670 .interruptible = true, 4671 }; 4672 int err; 4673 do { 4674 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4675 trace_nfs4_readlink(inode, err); 4676 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4677 &exception); 4678 } while (exception.retry); 4679 return err; 4680 } 4681 4682 /* 4683 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4684 */ 4685 static int 4686 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4687 int flags) 4688 { 4689 struct nfs_server *server = NFS_SERVER(dir); 4690 struct nfs4_label l, *ilabel; 4691 struct nfs_open_context *ctx; 4692 struct nfs4_state *state; 4693 int status = 0; 4694 4695 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4696 if (IS_ERR(ctx)) 4697 return PTR_ERR(ctx); 4698 4699 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4700 4701 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4702 sattr->ia_mode &= ~current_umask(); 4703 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4704 if (IS_ERR(state)) { 4705 status = PTR_ERR(state); 4706 goto out; 4707 } 4708 out: 4709 nfs4_label_release_security(ilabel); 4710 put_nfs_open_context(ctx); 4711 return status; 4712 } 4713 4714 static int 4715 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4716 { 4717 struct nfs_server *server = NFS_SERVER(dir); 4718 struct nfs_removeargs args = { 4719 .fh = NFS_FH(dir), 4720 .name = *name, 4721 }; 4722 struct nfs_removeres res = { 4723 .server = server, 4724 }; 4725 struct rpc_message msg = { 4726 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4727 .rpc_argp = &args, 4728 .rpc_resp = &res, 4729 }; 4730 unsigned long timestamp = jiffies; 4731 int status; 4732 4733 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4734 if (status == 0) { 4735 spin_lock(&dir->i_lock); 4736 /* Removing a directory decrements nlink in the parent */ 4737 if (ftype == NF4DIR && dir->i_nlink > 2) 4738 nfs4_dec_nlink_locked(dir); 4739 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4740 NFS_INO_INVALID_DATA); 4741 spin_unlock(&dir->i_lock); 4742 } 4743 return status; 4744 } 4745 4746 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4747 { 4748 struct nfs4_exception exception = { 4749 .interruptible = true, 4750 }; 4751 struct inode *inode = d_inode(dentry); 4752 int err; 4753 4754 if (inode) { 4755 if (inode->i_nlink == 1) 4756 nfs4_inode_return_delegation(inode); 4757 else 4758 nfs4_inode_make_writeable(inode); 4759 } 4760 do { 4761 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4762 trace_nfs4_remove(dir, &dentry->d_name, err); 4763 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4764 &exception); 4765 } while (exception.retry); 4766 return err; 4767 } 4768 4769 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4770 { 4771 struct nfs4_exception exception = { 4772 .interruptible = true, 4773 }; 4774 int err; 4775 4776 do { 4777 err = _nfs4_proc_remove(dir, name, NF4DIR); 4778 trace_nfs4_remove(dir, name, err); 4779 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4780 &exception); 4781 } while (exception.retry); 4782 return err; 4783 } 4784 4785 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4786 struct dentry *dentry, 4787 struct inode *inode) 4788 { 4789 struct nfs_removeargs *args = msg->rpc_argp; 4790 struct nfs_removeres *res = msg->rpc_resp; 4791 4792 res->server = NFS_SB(dentry->d_sb); 4793 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4794 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4795 4796 nfs_fattr_init(res->dir_attr); 4797 4798 if (inode) { 4799 nfs4_inode_return_delegation(inode); 4800 nfs_d_prune_case_insensitive_aliases(inode); 4801 } 4802 } 4803 4804 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4805 { 4806 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4807 &data->args.seq_args, 4808 &data->res.seq_res, 4809 task); 4810 } 4811 4812 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4813 { 4814 struct nfs_unlinkdata *data = task->tk_calldata; 4815 struct nfs_removeres *res = &data->res; 4816 4817 if (!nfs4_sequence_done(task, &res->seq_res)) 4818 return 0; 4819 if (nfs4_async_handle_error(task, res->server, NULL, 4820 &data->timeout) == -EAGAIN) 4821 return 0; 4822 if (task->tk_status == 0) 4823 nfs4_update_changeattr(dir, &res->cinfo, 4824 res->dir_attr->time_start, 4825 NFS_INO_INVALID_DATA); 4826 return 1; 4827 } 4828 4829 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4830 struct dentry *old_dentry, 4831 struct dentry *new_dentry) 4832 { 4833 struct nfs_renameargs *arg = msg->rpc_argp; 4834 struct nfs_renameres *res = msg->rpc_resp; 4835 struct inode *old_inode = d_inode(old_dentry); 4836 struct inode *new_inode = d_inode(new_dentry); 4837 4838 if (old_inode) 4839 nfs4_inode_make_writeable(old_inode); 4840 if (new_inode) 4841 nfs4_inode_return_delegation(new_inode); 4842 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4843 res->server = NFS_SB(old_dentry->d_sb); 4844 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4845 } 4846 4847 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4848 { 4849 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4850 &data->args.seq_args, 4851 &data->res.seq_res, 4852 task); 4853 } 4854 4855 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4856 struct inode *new_dir) 4857 { 4858 struct nfs_renamedata *data = task->tk_calldata; 4859 struct nfs_renameres *res = &data->res; 4860 4861 if (!nfs4_sequence_done(task, &res->seq_res)) 4862 return 0; 4863 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4864 return 0; 4865 4866 if (task->tk_status == 0) { 4867 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4868 if (new_dir != old_dir) { 4869 /* Note: If we moved a directory, nlink will change */ 4870 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4871 res->old_fattr->time_start, 4872 NFS_INO_INVALID_NLINK | 4873 NFS_INO_INVALID_DATA); 4874 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4875 res->new_fattr->time_start, 4876 NFS_INO_INVALID_NLINK | 4877 NFS_INO_INVALID_DATA); 4878 } else 4879 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4880 res->old_fattr->time_start, 4881 NFS_INO_INVALID_DATA); 4882 } 4883 return 1; 4884 } 4885 4886 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4887 { 4888 struct nfs_server *server = NFS_SERVER(inode); 4889 __u32 bitmask[NFS4_BITMASK_SZ]; 4890 struct nfs4_link_arg arg = { 4891 .fh = NFS_FH(inode), 4892 .dir_fh = NFS_FH(dir), 4893 .name = name, 4894 .bitmask = bitmask, 4895 }; 4896 struct nfs4_link_res res = { 4897 .server = server, 4898 }; 4899 struct rpc_message msg = { 4900 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4901 .rpc_argp = &arg, 4902 .rpc_resp = &res, 4903 }; 4904 int status = -ENOMEM; 4905 4906 res.fattr = nfs_alloc_fattr_with_label(server); 4907 if (res.fattr == NULL) 4908 goto out; 4909 4910 nfs4_inode_make_writeable(inode); 4911 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4912 NFS_INO_INVALID_CHANGE); 4913 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4914 if (!status) { 4915 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4916 NFS_INO_INVALID_DATA); 4917 nfs4_inc_nlink(inode); 4918 status = nfs_post_op_update_inode(inode, res.fattr); 4919 if (!status) 4920 nfs_setsecurity(inode, res.fattr); 4921 } 4922 4923 out: 4924 nfs_free_fattr(res.fattr); 4925 return status; 4926 } 4927 4928 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4929 { 4930 struct nfs4_exception exception = { 4931 .interruptible = true, 4932 }; 4933 int err; 4934 do { 4935 err = nfs4_handle_exception(NFS_SERVER(inode), 4936 _nfs4_proc_link(inode, dir, name), 4937 &exception); 4938 } while (exception.retry); 4939 return err; 4940 } 4941 4942 struct nfs4_createdata { 4943 struct rpc_message msg; 4944 struct nfs4_create_arg arg; 4945 struct nfs4_create_res res; 4946 struct nfs_fh fh; 4947 struct nfs_fattr fattr; 4948 }; 4949 4950 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4951 const struct qstr *name, struct iattr *sattr, u32 ftype) 4952 { 4953 struct nfs4_createdata *data; 4954 4955 data = kzalloc(sizeof(*data), GFP_KERNEL); 4956 if (data != NULL) { 4957 struct nfs_server *server = NFS_SERVER(dir); 4958 4959 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4960 if (IS_ERR(data->fattr.label)) 4961 goto out_free; 4962 4963 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4964 data->msg.rpc_argp = &data->arg; 4965 data->msg.rpc_resp = &data->res; 4966 data->arg.dir_fh = NFS_FH(dir); 4967 data->arg.server = server; 4968 data->arg.name = name; 4969 data->arg.attrs = sattr; 4970 data->arg.ftype = ftype; 4971 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4972 data->arg.umask = current_umask(); 4973 data->res.server = server; 4974 data->res.fh = &data->fh; 4975 data->res.fattr = &data->fattr; 4976 nfs_fattr_init(data->res.fattr); 4977 } 4978 return data; 4979 out_free: 4980 kfree(data); 4981 return NULL; 4982 } 4983 4984 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4985 { 4986 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4987 &data->arg.seq_args, &data->res.seq_res, 1); 4988 if (status == 0) { 4989 spin_lock(&dir->i_lock); 4990 /* Creating a directory bumps nlink in the parent */ 4991 if (data->arg.ftype == NF4DIR) 4992 nfs4_inc_nlink_locked(dir); 4993 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4994 data->res.fattr->time_start, 4995 NFS_INO_INVALID_DATA); 4996 spin_unlock(&dir->i_lock); 4997 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 4998 } 4999 return status; 5000 } 5001 5002 static void nfs4_free_createdata(struct nfs4_createdata *data) 5003 { 5004 nfs4_label_free(data->fattr.label); 5005 kfree(data); 5006 } 5007 5008 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5009 struct page *page, unsigned int len, struct iattr *sattr, 5010 struct nfs4_label *label) 5011 { 5012 struct nfs4_createdata *data; 5013 int status = -ENAMETOOLONG; 5014 5015 if (len > NFS4_MAXPATHLEN) 5016 goto out; 5017 5018 status = -ENOMEM; 5019 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5020 if (data == NULL) 5021 goto out; 5022 5023 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5024 data->arg.u.symlink.pages = &page; 5025 data->arg.u.symlink.len = len; 5026 data->arg.label = label; 5027 5028 status = nfs4_do_create(dir, dentry, data); 5029 5030 nfs4_free_createdata(data); 5031 out: 5032 return status; 5033 } 5034 5035 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5036 struct page *page, unsigned int len, struct iattr *sattr) 5037 { 5038 struct nfs4_exception exception = { 5039 .interruptible = true, 5040 }; 5041 struct nfs4_label l, *label; 5042 int err; 5043 5044 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5045 5046 do { 5047 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5048 trace_nfs4_symlink(dir, &dentry->d_name, err); 5049 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5050 &exception); 5051 } while (exception.retry); 5052 5053 nfs4_label_release_security(label); 5054 return err; 5055 } 5056 5057 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5058 struct iattr *sattr, struct nfs4_label *label) 5059 { 5060 struct nfs4_createdata *data; 5061 int status = -ENOMEM; 5062 5063 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5064 if (data == NULL) 5065 goto out; 5066 5067 data->arg.label = label; 5068 status = nfs4_do_create(dir, dentry, data); 5069 5070 nfs4_free_createdata(data); 5071 out: 5072 return status; 5073 } 5074 5075 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5076 struct iattr *sattr) 5077 { 5078 struct nfs_server *server = NFS_SERVER(dir); 5079 struct nfs4_exception exception = { 5080 .interruptible = true, 5081 }; 5082 struct nfs4_label l, *label; 5083 int err; 5084 5085 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5086 5087 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5088 sattr->ia_mode &= ~current_umask(); 5089 do { 5090 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5091 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5092 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5093 &exception); 5094 } while (exception.retry); 5095 nfs4_label_release_security(label); 5096 5097 return err; 5098 } 5099 5100 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5101 struct nfs_readdir_res *nr_res) 5102 { 5103 struct inode *dir = d_inode(nr_arg->dentry); 5104 struct nfs_server *server = NFS_SERVER(dir); 5105 struct nfs4_readdir_arg args = { 5106 .fh = NFS_FH(dir), 5107 .pages = nr_arg->pages, 5108 .pgbase = 0, 5109 .count = nr_arg->page_len, 5110 .plus = nr_arg->plus, 5111 }; 5112 struct nfs4_readdir_res res; 5113 struct rpc_message msg = { 5114 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5115 .rpc_argp = &args, 5116 .rpc_resp = &res, 5117 .rpc_cred = nr_arg->cred, 5118 }; 5119 int status; 5120 5121 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5122 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5123 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5124 args.bitmask = server->attr_bitmask_nl; 5125 else 5126 args.bitmask = server->attr_bitmask; 5127 5128 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5129 res.pgbase = args.pgbase; 5130 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5131 &res.seq_res, 0); 5132 if (status >= 0) { 5133 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5134 status += args.pgbase; 5135 } 5136 5137 nfs_invalidate_atime(dir); 5138 5139 dprintk("%s: returns %d\n", __func__, status); 5140 return status; 5141 } 5142 5143 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5144 struct nfs_readdir_res *res) 5145 { 5146 struct nfs4_exception exception = { 5147 .interruptible = true, 5148 }; 5149 int err; 5150 do { 5151 err = _nfs4_proc_readdir(arg, res); 5152 trace_nfs4_readdir(d_inode(arg->dentry), err); 5153 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5154 err, &exception); 5155 } while (exception.retry); 5156 return err; 5157 } 5158 5159 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5160 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5161 { 5162 struct nfs4_createdata *data; 5163 int mode = sattr->ia_mode; 5164 int status = -ENOMEM; 5165 5166 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5167 if (data == NULL) 5168 goto out; 5169 5170 if (S_ISFIFO(mode)) 5171 data->arg.ftype = NF4FIFO; 5172 else if (S_ISBLK(mode)) { 5173 data->arg.ftype = NF4BLK; 5174 data->arg.u.device.specdata1 = MAJOR(rdev); 5175 data->arg.u.device.specdata2 = MINOR(rdev); 5176 } 5177 else if (S_ISCHR(mode)) { 5178 data->arg.ftype = NF4CHR; 5179 data->arg.u.device.specdata1 = MAJOR(rdev); 5180 data->arg.u.device.specdata2 = MINOR(rdev); 5181 } else if (!S_ISSOCK(mode)) { 5182 status = -EINVAL; 5183 goto out_free; 5184 } 5185 5186 data->arg.label = label; 5187 status = nfs4_do_create(dir, dentry, data); 5188 out_free: 5189 nfs4_free_createdata(data); 5190 out: 5191 return status; 5192 } 5193 5194 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5195 struct iattr *sattr, dev_t rdev) 5196 { 5197 struct nfs_server *server = NFS_SERVER(dir); 5198 struct nfs4_exception exception = { 5199 .interruptible = true, 5200 }; 5201 struct nfs4_label l, *label; 5202 int err; 5203 5204 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5205 5206 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5207 sattr->ia_mode &= ~current_umask(); 5208 do { 5209 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5210 trace_nfs4_mknod(dir, &dentry->d_name, err); 5211 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5212 &exception); 5213 } while (exception.retry); 5214 5215 nfs4_label_release_security(label); 5216 5217 return err; 5218 } 5219 5220 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5221 struct nfs_fsstat *fsstat) 5222 { 5223 struct nfs4_statfs_arg args = { 5224 .fh = fhandle, 5225 .bitmask = server->attr_bitmask, 5226 }; 5227 struct nfs4_statfs_res res = { 5228 .fsstat = fsstat, 5229 }; 5230 struct rpc_message msg = { 5231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5232 .rpc_argp = &args, 5233 .rpc_resp = &res, 5234 }; 5235 5236 nfs_fattr_init(fsstat->fattr); 5237 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5238 } 5239 5240 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5241 { 5242 struct nfs4_exception exception = { 5243 .interruptible = true, 5244 }; 5245 int err; 5246 do { 5247 err = nfs4_handle_exception(server, 5248 _nfs4_proc_statfs(server, fhandle, fsstat), 5249 &exception); 5250 } while (exception.retry); 5251 return err; 5252 } 5253 5254 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5255 struct nfs_fsinfo *fsinfo) 5256 { 5257 struct nfs4_fsinfo_arg args = { 5258 .fh = fhandle, 5259 .bitmask = server->attr_bitmask, 5260 }; 5261 struct nfs4_fsinfo_res res = { 5262 .fsinfo = fsinfo, 5263 }; 5264 struct rpc_message msg = { 5265 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5266 .rpc_argp = &args, 5267 .rpc_resp = &res, 5268 }; 5269 5270 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5271 } 5272 5273 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5274 { 5275 struct nfs4_exception exception = { 5276 .interruptible = true, 5277 }; 5278 int err; 5279 5280 do { 5281 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5282 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5283 if (err == 0) { 5284 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5285 break; 5286 } 5287 err = nfs4_handle_exception(server, err, &exception); 5288 } while (exception.retry); 5289 return err; 5290 } 5291 5292 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5293 { 5294 int error; 5295 5296 nfs_fattr_init(fsinfo->fattr); 5297 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5298 if (error == 0) { 5299 /* block layout checks this! */ 5300 server->pnfs_blksize = fsinfo->blksize; 5301 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5302 } 5303 5304 return error; 5305 } 5306 5307 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5308 struct nfs_pathconf *pathconf) 5309 { 5310 struct nfs4_pathconf_arg args = { 5311 .fh = fhandle, 5312 .bitmask = server->attr_bitmask, 5313 }; 5314 struct nfs4_pathconf_res res = { 5315 .pathconf = pathconf, 5316 }; 5317 struct rpc_message msg = { 5318 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5319 .rpc_argp = &args, 5320 .rpc_resp = &res, 5321 }; 5322 5323 /* None of the pathconf attributes are mandatory to implement */ 5324 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5325 memset(pathconf, 0, sizeof(*pathconf)); 5326 return 0; 5327 } 5328 5329 nfs_fattr_init(pathconf->fattr); 5330 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5331 } 5332 5333 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5334 struct nfs_pathconf *pathconf) 5335 { 5336 struct nfs4_exception exception = { 5337 .interruptible = true, 5338 }; 5339 int err; 5340 5341 do { 5342 err = nfs4_handle_exception(server, 5343 _nfs4_proc_pathconf(server, fhandle, pathconf), 5344 &exception); 5345 } while (exception.retry); 5346 return err; 5347 } 5348 5349 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5350 const struct nfs_open_context *ctx, 5351 const struct nfs_lock_context *l_ctx, 5352 fmode_t fmode) 5353 { 5354 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5355 } 5356 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5357 5358 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5359 const struct nfs_open_context *ctx, 5360 const struct nfs_lock_context *l_ctx, 5361 fmode_t fmode) 5362 { 5363 nfs4_stateid _current_stateid; 5364 5365 /* If the current stateid represents a lost lock, then exit */ 5366 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5367 return true; 5368 return nfs4_stateid_match(stateid, &_current_stateid); 5369 } 5370 5371 static bool nfs4_error_stateid_expired(int err) 5372 { 5373 switch (err) { 5374 case -NFS4ERR_DELEG_REVOKED: 5375 case -NFS4ERR_ADMIN_REVOKED: 5376 case -NFS4ERR_BAD_STATEID: 5377 case -NFS4ERR_STALE_STATEID: 5378 case -NFS4ERR_OLD_STATEID: 5379 case -NFS4ERR_OPENMODE: 5380 case -NFS4ERR_EXPIRED: 5381 return true; 5382 } 5383 return false; 5384 } 5385 5386 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5387 { 5388 struct nfs_server *server = NFS_SERVER(hdr->inode); 5389 5390 trace_nfs4_read(hdr, task->tk_status); 5391 if (task->tk_status < 0) { 5392 struct nfs4_exception exception = { 5393 .inode = hdr->inode, 5394 .state = hdr->args.context->state, 5395 .stateid = &hdr->args.stateid, 5396 }; 5397 task->tk_status = nfs4_async_handle_exception(task, 5398 server, task->tk_status, &exception); 5399 if (exception.retry) { 5400 rpc_restart_call_prepare(task); 5401 return -EAGAIN; 5402 } 5403 } 5404 5405 if (task->tk_status > 0) 5406 renew_lease(server, hdr->timestamp); 5407 return 0; 5408 } 5409 5410 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5411 struct nfs_pgio_args *args) 5412 { 5413 5414 if (!nfs4_error_stateid_expired(task->tk_status) || 5415 nfs4_stateid_is_current(&args->stateid, 5416 args->context, 5417 args->lock_context, 5418 FMODE_READ)) 5419 return false; 5420 rpc_restart_call_prepare(task); 5421 return true; 5422 } 5423 5424 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5425 struct nfs_pgio_header *hdr) 5426 { 5427 struct nfs_server *server = NFS_SERVER(hdr->inode); 5428 struct rpc_message *msg = &task->tk_msg; 5429 5430 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5431 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5432 server->caps &= ~NFS_CAP_READ_PLUS; 5433 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5434 rpc_restart_call_prepare(task); 5435 return true; 5436 } 5437 return false; 5438 } 5439 5440 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5441 { 5442 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5443 return -EAGAIN; 5444 if (nfs4_read_stateid_changed(task, &hdr->args)) 5445 return -EAGAIN; 5446 if (nfs4_read_plus_not_supported(task, hdr)) 5447 return -EAGAIN; 5448 if (task->tk_status > 0) 5449 nfs_invalidate_atime(hdr->inode); 5450 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5451 nfs4_read_done_cb(task, hdr); 5452 } 5453 5454 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5455 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5456 struct rpc_message *msg) 5457 { 5458 /* Note: We don't use READ_PLUS with pNFS yet */ 5459 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) 5460 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5461 } 5462 #else 5463 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5464 struct rpc_message *msg) 5465 { 5466 } 5467 #endif /* CONFIG_NFS_V4_2 */ 5468 5469 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5470 struct rpc_message *msg) 5471 { 5472 hdr->timestamp = jiffies; 5473 if (!hdr->pgio_done_cb) 5474 hdr->pgio_done_cb = nfs4_read_done_cb; 5475 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5476 nfs42_read_plus_support(hdr, msg); 5477 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5478 } 5479 5480 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5481 struct nfs_pgio_header *hdr) 5482 { 5483 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5484 &hdr->args.seq_args, 5485 &hdr->res.seq_res, 5486 task)) 5487 return 0; 5488 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5489 hdr->args.lock_context, 5490 hdr->rw_mode) == -EIO) 5491 return -EIO; 5492 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5493 return -EIO; 5494 return 0; 5495 } 5496 5497 static int nfs4_write_done_cb(struct rpc_task *task, 5498 struct nfs_pgio_header *hdr) 5499 { 5500 struct inode *inode = hdr->inode; 5501 5502 trace_nfs4_write(hdr, task->tk_status); 5503 if (task->tk_status < 0) { 5504 struct nfs4_exception exception = { 5505 .inode = hdr->inode, 5506 .state = hdr->args.context->state, 5507 .stateid = &hdr->args.stateid, 5508 }; 5509 task->tk_status = nfs4_async_handle_exception(task, 5510 NFS_SERVER(inode), task->tk_status, 5511 &exception); 5512 if (exception.retry) { 5513 rpc_restart_call_prepare(task); 5514 return -EAGAIN; 5515 } 5516 } 5517 if (task->tk_status >= 0) { 5518 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5519 nfs_writeback_update_inode(hdr); 5520 } 5521 return 0; 5522 } 5523 5524 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5525 struct nfs_pgio_args *args) 5526 { 5527 5528 if (!nfs4_error_stateid_expired(task->tk_status) || 5529 nfs4_stateid_is_current(&args->stateid, 5530 args->context, 5531 args->lock_context, 5532 FMODE_WRITE)) 5533 return false; 5534 rpc_restart_call_prepare(task); 5535 return true; 5536 } 5537 5538 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5539 { 5540 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5541 return -EAGAIN; 5542 if (nfs4_write_stateid_changed(task, &hdr->args)) 5543 return -EAGAIN; 5544 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5545 nfs4_write_done_cb(task, hdr); 5546 } 5547 5548 static 5549 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5550 { 5551 /* Don't request attributes for pNFS or O_DIRECT writes */ 5552 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5553 return false; 5554 /* Otherwise, request attributes if and only if we don't hold 5555 * a delegation 5556 */ 5557 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5558 } 5559 5560 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5561 struct inode *inode, unsigned long cache_validity) 5562 { 5563 struct nfs_server *server = NFS_SERVER(inode); 5564 unsigned int i; 5565 5566 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5567 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5568 5569 if (cache_validity & NFS_INO_INVALID_CHANGE) 5570 bitmask[0] |= FATTR4_WORD0_CHANGE; 5571 if (cache_validity & NFS_INO_INVALID_ATIME) 5572 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5573 if (cache_validity & NFS_INO_INVALID_MODE) 5574 bitmask[1] |= FATTR4_WORD1_MODE; 5575 if (cache_validity & NFS_INO_INVALID_OTHER) 5576 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5577 if (cache_validity & NFS_INO_INVALID_NLINK) 5578 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5579 if (cache_validity & NFS_INO_INVALID_CTIME) 5580 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5581 if (cache_validity & NFS_INO_INVALID_MTIME) 5582 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5583 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5584 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5585 5586 if (cache_validity & NFS_INO_INVALID_SIZE) 5587 bitmask[0] |= FATTR4_WORD0_SIZE; 5588 5589 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5590 bitmask[i] &= server->attr_bitmask[i]; 5591 } 5592 5593 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5594 struct rpc_message *msg, 5595 struct rpc_clnt **clnt) 5596 { 5597 struct nfs_server *server = NFS_SERVER(hdr->inode); 5598 5599 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5600 hdr->args.bitmask = NULL; 5601 hdr->res.fattr = NULL; 5602 } else { 5603 nfs4_bitmask_set(hdr->args.bitmask_store, 5604 server->cache_consistency_bitmask, 5605 hdr->inode, NFS_INO_INVALID_BLOCKS); 5606 hdr->args.bitmask = hdr->args.bitmask_store; 5607 } 5608 5609 if (!hdr->pgio_done_cb) 5610 hdr->pgio_done_cb = nfs4_write_done_cb; 5611 hdr->res.server = server; 5612 hdr->timestamp = jiffies; 5613 5614 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5615 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5616 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5617 } 5618 5619 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5620 { 5621 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5622 &data->args.seq_args, 5623 &data->res.seq_res, 5624 task); 5625 } 5626 5627 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5628 { 5629 struct inode *inode = data->inode; 5630 5631 trace_nfs4_commit(data, task->tk_status); 5632 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5633 NULL, NULL) == -EAGAIN) { 5634 rpc_restart_call_prepare(task); 5635 return -EAGAIN; 5636 } 5637 return 0; 5638 } 5639 5640 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5641 { 5642 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5643 return -EAGAIN; 5644 return data->commit_done_cb(task, data); 5645 } 5646 5647 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5648 struct rpc_clnt **clnt) 5649 { 5650 struct nfs_server *server = NFS_SERVER(data->inode); 5651 5652 if (data->commit_done_cb == NULL) 5653 data->commit_done_cb = nfs4_commit_done_cb; 5654 data->res.server = server; 5655 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5656 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5657 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5658 } 5659 5660 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5661 struct nfs_commitres *res) 5662 { 5663 struct inode *dst_inode = file_inode(dst); 5664 struct nfs_server *server = NFS_SERVER(dst_inode); 5665 struct rpc_message msg = { 5666 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5667 .rpc_argp = args, 5668 .rpc_resp = res, 5669 }; 5670 5671 args->fh = NFS_FH(dst_inode); 5672 return nfs4_call_sync(server->client, server, &msg, 5673 &args->seq_args, &res->seq_res, 1); 5674 } 5675 5676 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5677 { 5678 struct nfs_commitargs args = { 5679 .offset = offset, 5680 .count = count, 5681 }; 5682 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5683 struct nfs4_exception exception = { }; 5684 int status; 5685 5686 do { 5687 status = _nfs4_proc_commit(dst, &args, res); 5688 status = nfs4_handle_exception(dst_server, status, &exception); 5689 } while (exception.retry); 5690 5691 return status; 5692 } 5693 5694 struct nfs4_renewdata { 5695 struct nfs_client *client; 5696 unsigned long timestamp; 5697 }; 5698 5699 /* 5700 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5701 * standalone procedure for queueing an asynchronous RENEW. 5702 */ 5703 static void nfs4_renew_release(void *calldata) 5704 { 5705 struct nfs4_renewdata *data = calldata; 5706 struct nfs_client *clp = data->client; 5707 5708 if (refcount_read(&clp->cl_count) > 1) 5709 nfs4_schedule_state_renewal(clp); 5710 nfs_put_client(clp); 5711 kfree(data); 5712 } 5713 5714 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5715 { 5716 struct nfs4_renewdata *data = calldata; 5717 struct nfs_client *clp = data->client; 5718 unsigned long timestamp = data->timestamp; 5719 5720 trace_nfs4_renew_async(clp, task->tk_status); 5721 switch (task->tk_status) { 5722 case 0: 5723 break; 5724 case -NFS4ERR_LEASE_MOVED: 5725 nfs4_schedule_lease_moved_recovery(clp); 5726 break; 5727 default: 5728 /* Unless we're shutting down, schedule state recovery! */ 5729 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5730 return; 5731 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5732 nfs4_schedule_lease_recovery(clp); 5733 return; 5734 } 5735 nfs4_schedule_path_down_recovery(clp); 5736 } 5737 do_renew_lease(clp, timestamp); 5738 } 5739 5740 static const struct rpc_call_ops nfs4_renew_ops = { 5741 .rpc_call_done = nfs4_renew_done, 5742 .rpc_release = nfs4_renew_release, 5743 }; 5744 5745 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5746 { 5747 struct rpc_message msg = { 5748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5749 .rpc_argp = clp, 5750 .rpc_cred = cred, 5751 }; 5752 struct nfs4_renewdata *data; 5753 5754 if (renew_flags == 0) 5755 return 0; 5756 if (!refcount_inc_not_zero(&clp->cl_count)) 5757 return -EIO; 5758 data = kmalloc(sizeof(*data), GFP_NOFS); 5759 if (data == NULL) { 5760 nfs_put_client(clp); 5761 return -ENOMEM; 5762 } 5763 data->client = clp; 5764 data->timestamp = jiffies; 5765 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5766 &nfs4_renew_ops, data); 5767 } 5768 5769 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5770 { 5771 struct rpc_message msg = { 5772 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5773 .rpc_argp = clp, 5774 .rpc_cred = cred, 5775 }; 5776 unsigned long now = jiffies; 5777 int status; 5778 5779 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5780 if (status < 0) 5781 return status; 5782 do_renew_lease(clp, now); 5783 return 0; 5784 } 5785 5786 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5787 enum nfs4_acl_type type) 5788 { 5789 switch (type) { 5790 default: 5791 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5792 case NFS4ACL_DACL: 5793 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5794 case NFS4ACL_SACL: 5795 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5796 } 5797 } 5798 5799 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5800 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5801 * the stack. 5802 */ 5803 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5804 5805 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5806 struct page **pages) 5807 { 5808 struct page *newpage, **spages; 5809 int rc = 0; 5810 size_t len; 5811 spages = pages; 5812 5813 do { 5814 len = min_t(size_t, PAGE_SIZE, buflen); 5815 newpage = alloc_page(GFP_KERNEL); 5816 5817 if (newpage == NULL) 5818 goto unwind; 5819 memcpy(page_address(newpage), buf, len); 5820 buf += len; 5821 buflen -= len; 5822 *pages++ = newpage; 5823 rc++; 5824 } while (buflen != 0); 5825 5826 return rc; 5827 5828 unwind: 5829 for(; rc > 0; rc--) 5830 __free_page(spages[rc-1]); 5831 return -ENOMEM; 5832 } 5833 5834 struct nfs4_cached_acl { 5835 enum nfs4_acl_type type; 5836 int cached; 5837 size_t len; 5838 char data[]; 5839 }; 5840 5841 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5842 { 5843 struct nfs_inode *nfsi = NFS_I(inode); 5844 5845 spin_lock(&inode->i_lock); 5846 kfree(nfsi->nfs4_acl); 5847 nfsi->nfs4_acl = acl; 5848 spin_unlock(&inode->i_lock); 5849 } 5850 5851 static void nfs4_zap_acl_attr(struct inode *inode) 5852 { 5853 nfs4_set_cached_acl(inode, NULL); 5854 } 5855 5856 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5857 size_t buflen, enum nfs4_acl_type type) 5858 { 5859 struct nfs_inode *nfsi = NFS_I(inode); 5860 struct nfs4_cached_acl *acl; 5861 int ret = -ENOENT; 5862 5863 spin_lock(&inode->i_lock); 5864 acl = nfsi->nfs4_acl; 5865 if (acl == NULL) 5866 goto out; 5867 if (acl->type != type) 5868 goto out; 5869 if (buf == NULL) /* user is just asking for length */ 5870 goto out_len; 5871 if (acl->cached == 0) 5872 goto out; 5873 ret = -ERANGE; /* see getxattr(2) man page */ 5874 if (acl->len > buflen) 5875 goto out; 5876 memcpy(buf, acl->data, acl->len); 5877 out_len: 5878 ret = acl->len; 5879 out: 5880 spin_unlock(&inode->i_lock); 5881 return ret; 5882 } 5883 5884 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5885 size_t pgbase, size_t acl_len, 5886 enum nfs4_acl_type type) 5887 { 5888 struct nfs4_cached_acl *acl; 5889 size_t buflen = sizeof(*acl) + acl_len; 5890 5891 if (buflen <= PAGE_SIZE) { 5892 acl = kmalloc(buflen, GFP_KERNEL); 5893 if (acl == NULL) 5894 goto out; 5895 acl->cached = 1; 5896 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5897 } else { 5898 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5899 if (acl == NULL) 5900 goto out; 5901 acl->cached = 0; 5902 } 5903 acl->type = type; 5904 acl->len = acl_len; 5905 out: 5906 nfs4_set_cached_acl(inode, acl); 5907 } 5908 5909 /* 5910 * The getxattr API returns the required buffer length when called with a 5911 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5912 * the required buf. On a NULL buf, we send a page of data to the server 5913 * guessing that the ACL request can be serviced by a page. If so, we cache 5914 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5915 * the cache. If not so, we throw away the page, and cache the required 5916 * length. The next getxattr call will then produce another round trip to 5917 * the server, this time with the input buf of the required size. 5918 */ 5919 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5920 size_t buflen, enum nfs4_acl_type type) 5921 { 5922 struct page **pages; 5923 struct nfs_getaclargs args = { 5924 .fh = NFS_FH(inode), 5925 .acl_type = type, 5926 .acl_len = buflen, 5927 }; 5928 struct nfs_getaclres res = { 5929 .acl_type = type, 5930 .acl_len = buflen, 5931 }; 5932 struct rpc_message msg = { 5933 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5934 .rpc_argp = &args, 5935 .rpc_resp = &res, 5936 }; 5937 unsigned int npages; 5938 int ret = -ENOMEM, i; 5939 struct nfs_server *server = NFS_SERVER(inode); 5940 5941 if (buflen == 0) 5942 buflen = server->rsize; 5943 5944 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5945 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5946 if (!pages) 5947 return -ENOMEM; 5948 5949 args.acl_pages = pages; 5950 5951 for (i = 0; i < npages; i++) { 5952 pages[i] = alloc_page(GFP_KERNEL); 5953 if (!pages[i]) 5954 goto out_free; 5955 } 5956 5957 /* for decoding across pages */ 5958 res.acl_scratch = alloc_page(GFP_KERNEL); 5959 if (!res.acl_scratch) 5960 goto out_free; 5961 5962 args.acl_len = npages * PAGE_SIZE; 5963 5964 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5965 __func__, buf, buflen, npages, args.acl_len); 5966 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5967 &msg, &args.seq_args, &res.seq_res, 0); 5968 if (ret) 5969 goto out_free; 5970 5971 /* Handle the case where the passed-in buffer is too short */ 5972 if (res.acl_flags & NFS4_ACL_TRUNC) { 5973 /* Did the user only issue a request for the acl length? */ 5974 if (buf == NULL) 5975 goto out_ok; 5976 ret = -ERANGE; 5977 goto out_free; 5978 } 5979 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5980 type); 5981 if (buf) { 5982 if (res.acl_len > buflen) { 5983 ret = -ERANGE; 5984 goto out_free; 5985 } 5986 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5987 } 5988 out_ok: 5989 ret = res.acl_len; 5990 out_free: 5991 for (i = 0; i < npages; i++) 5992 if (pages[i]) 5993 __free_page(pages[i]); 5994 if (res.acl_scratch) 5995 __free_page(res.acl_scratch); 5996 kfree(pages); 5997 return ret; 5998 } 5999 6000 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6001 size_t buflen, enum nfs4_acl_type type) 6002 { 6003 struct nfs4_exception exception = { 6004 .interruptible = true, 6005 }; 6006 ssize_t ret; 6007 do { 6008 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6009 trace_nfs4_get_acl(inode, ret); 6010 if (ret >= 0) 6011 break; 6012 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6013 } while (exception.retry); 6014 return ret; 6015 } 6016 6017 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6018 enum nfs4_acl_type type) 6019 { 6020 struct nfs_server *server = NFS_SERVER(inode); 6021 int ret; 6022 6023 if (!nfs4_server_supports_acls(server, type)) 6024 return -EOPNOTSUPP; 6025 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6026 if (ret < 0) 6027 return ret; 6028 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6029 nfs_zap_acl_cache(inode); 6030 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6031 if (ret != -ENOENT) 6032 /* -ENOENT is returned if there is no ACL or if there is an ACL 6033 * but no cached acl data, just the acl length */ 6034 return ret; 6035 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6036 } 6037 6038 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6039 size_t buflen, enum nfs4_acl_type type) 6040 { 6041 struct nfs_server *server = NFS_SERVER(inode); 6042 struct page *pages[NFS4ACL_MAXPAGES]; 6043 struct nfs_setaclargs arg = { 6044 .fh = NFS_FH(inode), 6045 .acl_type = type, 6046 .acl_len = buflen, 6047 .acl_pages = pages, 6048 }; 6049 struct nfs_setaclres res; 6050 struct rpc_message msg = { 6051 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6052 .rpc_argp = &arg, 6053 .rpc_resp = &res, 6054 }; 6055 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6056 int ret, i; 6057 6058 /* You can't remove system.nfs4_acl: */ 6059 if (buflen == 0) 6060 return -EINVAL; 6061 if (!nfs4_server_supports_acls(server, type)) 6062 return -EOPNOTSUPP; 6063 if (npages > ARRAY_SIZE(pages)) 6064 return -ERANGE; 6065 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6066 if (i < 0) 6067 return i; 6068 nfs4_inode_make_writeable(inode); 6069 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6070 6071 /* 6072 * Free each page after tx, so the only ref left is 6073 * held by the network stack 6074 */ 6075 for (; i > 0; i--) 6076 put_page(pages[i-1]); 6077 6078 /* 6079 * Acl update can result in inode attribute update. 6080 * so mark the attribute cache invalid. 6081 */ 6082 spin_lock(&inode->i_lock); 6083 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6084 NFS_INO_INVALID_CTIME | 6085 NFS_INO_REVAL_FORCED); 6086 spin_unlock(&inode->i_lock); 6087 nfs_access_zap_cache(inode); 6088 nfs_zap_acl_cache(inode); 6089 return ret; 6090 } 6091 6092 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6093 size_t buflen, enum nfs4_acl_type type) 6094 { 6095 struct nfs4_exception exception = { }; 6096 int err; 6097 do { 6098 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6099 trace_nfs4_set_acl(inode, err); 6100 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6101 /* 6102 * no need to retry since the kernel 6103 * isn't involved in encoding the ACEs. 6104 */ 6105 err = -EINVAL; 6106 break; 6107 } 6108 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6109 &exception); 6110 } while (exception.retry); 6111 return err; 6112 } 6113 6114 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6115 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6116 size_t buflen) 6117 { 6118 struct nfs_server *server = NFS_SERVER(inode); 6119 struct nfs4_label label = {0, 0, buflen, buf}; 6120 6121 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6122 struct nfs_fattr fattr = { 6123 .label = &label, 6124 }; 6125 struct nfs4_getattr_arg arg = { 6126 .fh = NFS_FH(inode), 6127 .bitmask = bitmask, 6128 }; 6129 struct nfs4_getattr_res res = { 6130 .fattr = &fattr, 6131 .server = server, 6132 }; 6133 struct rpc_message msg = { 6134 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6135 .rpc_argp = &arg, 6136 .rpc_resp = &res, 6137 }; 6138 int ret; 6139 6140 nfs_fattr_init(&fattr); 6141 6142 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6143 if (ret) 6144 return ret; 6145 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6146 return -ENOENT; 6147 return label.len; 6148 } 6149 6150 static int nfs4_get_security_label(struct inode *inode, void *buf, 6151 size_t buflen) 6152 { 6153 struct nfs4_exception exception = { 6154 .interruptible = true, 6155 }; 6156 int err; 6157 6158 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6159 return -EOPNOTSUPP; 6160 6161 do { 6162 err = _nfs4_get_security_label(inode, buf, buflen); 6163 trace_nfs4_get_security_label(inode, err); 6164 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6165 &exception); 6166 } while (exception.retry); 6167 return err; 6168 } 6169 6170 static int _nfs4_do_set_security_label(struct inode *inode, 6171 struct nfs4_label *ilabel, 6172 struct nfs_fattr *fattr) 6173 { 6174 6175 struct iattr sattr = {0}; 6176 struct nfs_server *server = NFS_SERVER(inode); 6177 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6178 struct nfs_setattrargs arg = { 6179 .fh = NFS_FH(inode), 6180 .iap = &sattr, 6181 .server = server, 6182 .bitmask = bitmask, 6183 .label = ilabel, 6184 }; 6185 struct nfs_setattrres res = { 6186 .fattr = fattr, 6187 .server = server, 6188 }; 6189 struct rpc_message msg = { 6190 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6191 .rpc_argp = &arg, 6192 .rpc_resp = &res, 6193 }; 6194 int status; 6195 6196 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6197 6198 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6199 if (status) 6200 dprintk("%s failed: %d\n", __func__, status); 6201 6202 return status; 6203 } 6204 6205 static int nfs4_do_set_security_label(struct inode *inode, 6206 struct nfs4_label *ilabel, 6207 struct nfs_fattr *fattr) 6208 { 6209 struct nfs4_exception exception = { }; 6210 int err; 6211 6212 do { 6213 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6214 trace_nfs4_set_security_label(inode, err); 6215 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6216 &exception); 6217 } while (exception.retry); 6218 return err; 6219 } 6220 6221 static int 6222 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6223 { 6224 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6225 struct nfs_fattr *fattr; 6226 int status; 6227 6228 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6229 return -EOPNOTSUPP; 6230 6231 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6232 if (fattr == NULL) 6233 return -ENOMEM; 6234 6235 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6236 if (status == 0) 6237 nfs_setsecurity(inode, fattr); 6238 6239 return status; 6240 } 6241 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6242 6243 6244 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6245 nfs4_verifier *bootverf) 6246 { 6247 __be32 verf[2]; 6248 6249 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6250 /* An impossible timestamp guarantees this value 6251 * will never match a generated boot time. */ 6252 verf[0] = cpu_to_be32(U32_MAX); 6253 verf[1] = cpu_to_be32(U32_MAX); 6254 } else { 6255 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6256 u64 ns = ktime_to_ns(nn->boot_time); 6257 6258 verf[0] = cpu_to_be32(ns >> 32); 6259 verf[1] = cpu_to_be32(ns); 6260 } 6261 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6262 } 6263 6264 static size_t 6265 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6266 { 6267 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6268 struct nfs_netns_client *nn_clp = nn->nfs_client; 6269 const char *id; 6270 6271 buf[0] = '\0'; 6272 6273 if (nn_clp) { 6274 rcu_read_lock(); 6275 id = rcu_dereference(nn_clp->identifier); 6276 if (id) 6277 strscpy(buf, id, buflen); 6278 rcu_read_unlock(); 6279 } 6280 6281 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6282 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6283 6284 return strlen(buf); 6285 } 6286 6287 static int 6288 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6289 { 6290 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6291 size_t buflen; 6292 size_t len; 6293 char *str; 6294 6295 if (clp->cl_owner_id != NULL) 6296 return 0; 6297 6298 rcu_read_lock(); 6299 len = 14 + 6300 strlen(clp->cl_rpcclient->cl_nodename) + 6301 1 + 6302 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6303 1; 6304 rcu_read_unlock(); 6305 6306 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6307 if (buflen) 6308 len += buflen + 1; 6309 6310 if (len > NFS4_OPAQUE_LIMIT + 1) 6311 return -EINVAL; 6312 6313 /* 6314 * Since this string is allocated at mount time, and held until the 6315 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6316 * about a memory-reclaim deadlock. 6317 */ 6318 str = kmalloc(len, GFP_KERNEL); 6319 if (!str) 6320 return -ENOMEM; 6321 6322 rcu_read_lock(); 6323 if (buflen) 6324 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6325 clp->cl_rpcclient->cl_nodename, buf, 6326 rpc_peeraddr2str(clp->cl_rpcclient, 6327 RPC_DISPLAY_ADDR)); 6328 else 6329 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6330 clp->cl_rpcclient->cl_nodename, 6331 rpc_peeraddr2str(clp->cl_rpcclient, 6332 RPC_DISPLAY_ADDR)); 6333 rcu_read_unlock(); 6334 6335 clp->cl_owner_id = str; 6336 return 0; 6337 } 6338 6339 static int 6340 nfs4_init_uniform_client_string(struct nfs_client *clp) 6341 { 6342 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6343 size_t buflen; 6344 size_t len; 6345 char *str; 6346 6347 if (clp->cl_owner_id != NULL) 6348 return 0; 6349 6350 len = 10 + 10 + 1 + 10 + 1 + 6351 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6352 6353 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6354 if (buflen) 6355 len += buflen + 1; 6356 6357 if (len > NFS4_OPAQUE_LIMIT + 1) 6358 return -EINVAL; 6359 6360 /* 6361 * Since this string is allocated at mount time, and held until the 6362 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6363 * about a memory-reclaim deadlock. 6364 */ 6365 str = kmalloc(len, GFP_KERNEL); 6366 if (!str) 6367 return -ENOMEM; 6368 6369 if (buflen) 6370 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6371 clp->rpc_ops->version, clp->cl_minorversion, 6372 buf, clp->cl_rpcclient->cl_nodename); 6373 else 6374 scnprintf(str, len, "Linux NFSv%u.%u %s", 6375 clp->rpc_ops->version, clp->cl_minorversion, 6376 clp->cl_rpcclient->cl_nodename); 6377 clp->cl_owner_id = str; 6378 return 0; 6379 } 6380 6381 /* 6382 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6383 * services. Advertise one based on the address family of the 6384 * clientaddr. 6385 */ 6386 static unsigned int 6387 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6388 { 6389 if (strchr(clp->cl_ipaddr, ':') != NULL) 6390 return scnprintf(buf, len, "tcp6"); 6391 else 6392 return scnprintf(buf, len, "tcp"); 6393 } 6394 6395 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6396 { 6397 struct nfs4_setclientid *sc = calldata; 6398 6399 if (task->tk_status == 0) 6400 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6401 } 6402 6403 static const struct rpc_call_ops nfs4_setclientid_ops = { 6404 .rpc_call_done = nfs4_setclientid_done, 6405 }; 6406 6407 /** 6408 * nfs4_proc_setclientid - Negotiate client ID 6409 * @clp: state data structure 6410 * @program: RPC program for NFSv4 callback service 6411 * @port: IP port number for NFS4 callback service 6412 * @cred: credential to use for this call 6413 * @res: where to place the result 6414 * 6415 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6416 */ 6417 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6418 unsigned short port, const struct cred *cred, 6419 struct nfs4_setclientid_res *res) 6420 { 6421 nfs4_verifier sc_verifier; 6422 struct nfs4_setclientid setclientid = { 6423 .sc_verifier = &sc_verifier, 6424 .sc_prog = program, 6425 .sc_clnt = clp, 6426 }; 6427 struct rpc_message msg = { 6428 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6429 .rpc_argp = &setclientid, 6430 .rpc_resp = res, 6431 .rpc_cred = cred, 6432 }; 6433 struct rpc_task_setup task_setup_data = { 6434 .rpc_client = clp->cl_rpcclient, 6435 .rpc_message = &msg, 6436 .callback_ops = &nfs4_setclientid_ops, 6437 .callback_data = &setclientid, 6438 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6439 }; 6440 unsigned long now = jiffies; 6441 int status; 6442 6443 /* nfs_client_id4 */ 6444 nfs4_init_boot_verifier(clp, &sc_verifier); 6445 6446 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6447 status = nfs4_init_uniform_client_string(clp); 6448 else 6449 status = nfs4_init_nonuniform_client_string(clp); 6450 6451 if (status) 6452 goto out; 6453 6454 /* cb_client4 */ 6455 setclientid.sc_netid_len = 6456 nfs4_init_callback_netid(clp, 6457 setclientid.sc_netid, 6458 sizeof(setclientid.sc_netid)); 6459 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6460 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6461 clp->cl_ipaddr, port >> 8, port & 255); 6462 6463 dprintk("NFS call setclientid auth=%s, '%s'\n", 6464 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6465 clp->cl_owner_id); 6466 6467 status = nfs4_call_sync_custom(&task_setup_data); 6468 if (setclientid.sc_cred) { 6469 kfree(clp->cl_acceptor); 6470 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6471 put_rpccred(setclientid.sc_cred); 6472 } 6473 6474 if (status == 0) 6475 do_renew_lease(clp, now); 6476 out: 6477 trace_nfs4_setclientid(clp, status); 6478 dprintk("NFS reply setclientid: %d\n", status); 6479 return status; 6480 } 6481 6482 /** 6483 * nfs4_proc_setclientid_confirm - Confirm client ID 6484 * @clp: state data structure 6485 * @arg: result of a previous SETCLIENTID 6486 * @cred: credential to use for this call 6487 * 6488 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6489 */ 6490 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6491 struct nfs4_setclientid_res *arg, 6492 const struct cred *cred) 6493 { 6494 struct rpc_message msg = { 6495 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6496 .rpc_argp = arg, 6497 .rpc_cred = cred, 6498 }; 6499 int status; 6500 6501 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6502 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6503 clp->cl_clientid); 6504 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6505 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6506 trace_nfs4_setclientid_confirm(clp, status); 6507 dprintk("NFS reply setclientid_confirm: %d\n", status); 6508 return status; 6509 } 6510 6511 struct nfs4_delegreturndata { 6512 struct nfs4_delegreturnargs args; 6513 struct nfs4_delegreturnres res; 6514 struct nfs_fh fh; 6515 nfs4_stateid stateid; 6516 unsigned long timestamp; 6517 struct { 6518 struct nfs4_layoutreturn_args arg; 6519 struct nfs4_layoutreturn_res res; 6520 struct nfs4_xdr_opaque_data ld_private; 6521 u32 roc_barrier; 6522 bool roc; 6523 } lr; 6524 struct nfs_fattr fattr; 6525 int rpc_status; 6526 struct inode *inode; 6527 }; 6528 6529 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6530 { 6531 struct nfs4_delegreturndata *data = calldata; 6532 struct nfs4_exception exception = { 6533 .inode = data->inode, 6534 .stateid = &data->stateid, 6535 .task_is_privileged = data->args.seq_args.sa_privileged, 6536 }; 6537 6538 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6539 return; 6540 6541 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6542 6543 /* Handle Layoutreturn errors */ 6544 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6545 &data->res.lr_ret) == -EAGAIN) 6546 goto out_restart; 6547 6548 switch (task->tk_status) { 6549 case 0: 6550 renew_lease(data->res.server, data->timestamp); 6551 break; 6552 case -NFS4ERR_ADMIN_REVOKED: 6553 case -NFS4ERR_DELEG_REVOKED: 6554 case -NFS4ERR_EXPIRED: 6555 nfs4_free_revoked_stateid(data->res.server, 6556 data->args.stateid, 6557 task->tk_msg.rpc_cred); 6558 fallthrough; 6559 case -NFS4ERR_BAD_STATEID: 6560 case -NFS4ERR_STALE_STATEID: 6561 case -ETIMEDOUT: 6562 task->tk_status = 0; 6563 break; 6564 case -NFS4ERR_OLD_STATEID: 6565 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6566 nfs4_stateid_seqid_inc(&data->stateid); 6567 if (data->args.bitmask) { 6568 data->args.bitmask = NULL; 6569 data->res.fattr = NULL; 6570 } 6571 goto out_restart; 6572 case -NFS4ERR_ACCESS: 6573 if (data->args.bitmask) { 6574 data->args.bitmask = NULL; 6575 data->res.fattr = NULL; 6576 goto out_restart; 6577 } 6578 fallthrough; 6579 default: 6580 task->tk_status = nfs4_async_handle_exception(task, 6581 data->res.server, task->tk_status, 6582 &exception); 6583 if (exception.retry) 6584 goto out_restart; 6585 } 6586 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6587 data->rpc_status = task->tk_status; 6588 return; 6589 out_restart: 6590 task->tk_status = 0; 6591 rpc_restart_call_prepare(task); 6592 } 6593 6594 static void nfs4_delegreturn_release(void *calldata) 6595 { 6596 struct nfs4_delegreturndata *data = calldata; 6597 struct inode *inode = data->inode; 6598 6599 if (data->lr.roc) 6600 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6601 data->res.lr_ret); 6602 if (inode) { 6603 nfs4_fattr_set_prechange(&data->fattr, 6604 inode_peek_iversion_raw(inode)); 6605 nfs_refresh_inode(inode, &data->fattr); 6606 nfs_iput_and_deactive(inode); 6607 } 6608 kfree(calldata); 6609 } 6610 6611 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6612 { 6613 struct nfs4_delegreturndata *d_data; 6614 struct pnfs_layout_hdr *lo; 6615 6616 d_data = data; 6617 6618 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6619 nfs4_sequence_done(task, &d_data->res.seq_res); 6620 return; 6621 } 6622 6623 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6624 if (lo && !pnfs_layout_is_valid(lo)) { 6625 d_data->args.lr_args = NULL; 6626 d_data->res.lr_res = NULL; 6627 } 6628 6629 nfs4_setup_sequence(d_data->res.server->nfs_client, 6630 &d_data->args.seq_args, 6631 &d_data->res.seq_res, 6632 task); 6633 } 6634 6635 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6636 .rpc_call_prepare = nfs4_delegreturn_prepare, 6637 .rpc_call_done = nfs4_delegreturn_done, 6638 .rpc_release = nfs4_delegreturn_release, 6639 }; 6640 6641 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6642 { 6643 struct nfs4_delegreturndata *data; 6644 struct nfs_server *server = NFS_SERVER(inode); 6645 struct rpc_task *task; 6646 struct rpc_message msg = { 6647 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6648 .rpc_cred = cred, 6649 }; 6650 struct rpc_task_setup task_setup_data = { 6651 .rpc_client = server->client, 6652 .rpc_message = &msg, 6653 .callback_ops = &nfs4_delegreturn_ops, 6654 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6655 }; 6656 int status = 0; 6657 6658 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6659 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6660 6661 data = kzalloc(sizeof(*data), GFP_KERNEL); 6662 if (data == NULL) 6663 return -ENOMEM; 6664 6665 nfs4_state_protect(server->nfs_client, 6666 NFS_SP4_MACH_CRED_CLEANUP, 6667 &task_setup_data.rpc_client, &msg); 6668 6669 data->args.fhandle = &data->fh; 6670 data->args.stateid = &data->stateid; 6671 nfs4_bitmask_set(data->args.bitmask_store, 6672 server->cache_consistency_bitmask, inode, 0); 6673 data->args.bitmask = data->args.bitmask_store; 6674 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6675 nfs4_stateid_copy(&data->stateid, stateid); 6676 data->res.fattr = &data->fattr; 6677 data->res.server = server; 6678 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6679 data->lr.arg.ld_private = &data->lr.ld_private; 6680 nfs_fattr_init(data->res.fattr); 6681 data->timestamp = jiffies; 6682 data->rpc_status = 0; 6683 data->inode = nfs_igrab_and_active(inode); 6684 if (data->inode || issync) { 6685 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6686 cred); 6687 if (data->lr.roc) { 6688 data->args.lr_args = &data->lr.arg; 6689 data->res.lr_res = &data->lr.res; 6690 } 6691 } 6692 6693 if (!data->inode) 6694 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6695 1); 6696 else 6697 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6698 0); 6699 task_setup_data.callback_data = data; 6700 msg.rpc_argp = &data->args; 6701 msg.rpc_resp = &data->res; 6702 task = rpc_run_task(&task_setup_data); 6703 if (IS_ERR(task)) 6704 return PTR_ERR(task); 6705 if (!issync) 6706 goto out; 6707 status = rpc_wait_for_completion_task(task); 6708 if (status != 0) 6709 goto out; 6710 status = data->rpc_status; 6711 out: 6712 rpc_put_task(task); 6713 return status; 6714 } 6715 6716 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6717 { 6718 struct nfs_server *server = NFS_SERVER(inode); 6719 struct nfs4_exception exception = { }; 6720 int err; 6721 do { 6722 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6723 trace_nfs4_delegreturn(inode, stateid, err); 6724 switch (err) { 6725 case -NFS4ERR_STALE_STATEID: 6726 case -NFS4ERR_EXPIRED: 6727 case 0: 6728 return 0; 6729 } 6730 err = nfs4_handle_exception(server, err, &exception); 6731 } while (exception.retry); 6732 return err; 6733 } 6734 6735 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6736 { 6737 struct inode *inode = state->inode; 6738 struct nfs_server *server = NFS_SERVER(inode); 6739 struct nfs_client *clp = server->nfs_client; 6740 struct nfs_lockt_args arg = { 6741 .fh = NFS_FH(inode), 6742 .fl = request, 6743 }; 6744 struct nfs_lockt_res res = { 6745 .denied = request, 6746 }; 6747 struct rpc_message msg = { 6748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6749 .rpc_argp = &arg, 6750 .rpc_resp = &res, 6751 .rpc_cred = state->owner->so_cred, 6752 }; 6753 struct nfs4_lock_state *lsp; 6754 int status; 6755 6756 arg.lock_owner.clientid = clp->cl_clientid; 6757 status = nfs4_set_lock_state(state, request); 6758 if (status != 0) 6759 goto out; 6760 lsp = request->fl_u.nfs4_fl.owner; 6761 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6762 arg.lock_owner.s_dev = server->s_dev; 6763 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6764 switch (status) { 6765 case 0: 6766 request->fl_type = F_UNLCK; 6767 break; 6768 case -NFS4ERR_DENIED: 6769 status = 0; 6770 } 6771 request->fl_ops->fl_release_private(request); 6772 request->fl_ops = NULL; 6773 out: 6774 return status; 6775 } 6776 6777 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6778 { 6779 struct nfs4_exception exception = { 6780 .interruptible = true, 6781 }; 6782 int err; 6783 6784 do { 6785 err = _nfs4_proc_getlk(state, cmd, request); 6786 trace_nfs4_get_lock(request, state, cmd, err); 6787 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6788 &exception); 6789 } while (exception.retry); 6790 return err; 6791 } 6792 6793 /* 6794 * Update the seqid of a lock stateid after receiving 6795 * NFS4ERR_OLD_STATEID 6796 */ 6797 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6798 struct nfs4_lock_state *lsp) 6799 { 6800 struct nfs4_state *state = lsp->ls_state; 6801 bool ret = false; 6802 6803 spin_lock(&state->state_lock); 6804 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6805 goto out; 6806 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6807 nfs4_stateid_seqid_inc(dst); 6808 else 6809 dst->seqid = lsp->ls_stateid.seqid; 6810 ret = true; 6811 out: 6812 spin_unlock(&state->state_lock); 6813 return ret; 6814 } 6815 6816 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6817 struct nfs4_lock_state *lsp) 6818 { 6819 struct nfs4_state *state = lsp->ls_state; 6820 bool ret; 6821 6822 spin_lock(&state->state_lock); 6823 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6824 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6825 spin_unlock(&state->state_lock); 6826 return ret; 6827 } 6828 6829 struct nfs4_unlockdata { 6830 struct nfs_locku_args arg; 6831 struct nfs_locku_res res; 6832 struct nfs4_lock_state *lsp; 6833 struct nfs_open_context *ctx; 6834 struct nfs_lock_context *l_ctx; 6835 struct file_lock fl; 6836 struct nfs_server *server; 6837 unsigned long timestamp; 6838 }; 6839 6840 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6841 struct nfs_open_context *ctx, 6842 struct nfs4_lock_state *lsp, 6843 struct nfs_seqid *seqid) 6844 { 6845 struct nfs4_unlockdata *p; 6846 struct nfs4_state *state = lsp->ls_state; 6847 struct inode *inode = state->inode; 6848 6849 p = kzalloc(sizeof(*p), GFP_KERNEL); 6850 if (p == NULL) 6851 return NULL; 6852 p->arg.fh = NFS_FH(inode); 6853 p->arg.fl = &p->fl; 6854 p->arg.seqid = seqid; 6855 p->res.seqid = seqid; 6856 p->lsp = lsp; 6857 /* Ensure we don't close file until we're done freeing locks! */ 6858 p->ctx = get_nfs_open_context(ctx); 6859 p->l_ctx = nfs_get_lock_context(ctx); 6860 locks_init_lock(&p->fl); 6861 locks_copy_lock(&p->fl, fl); 6862 p->server = NFS_SERVER(inode); 6863 spin_lock(&state->state_lock); 6864 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6865 spin_unlock(&state->state_lock); 6866 return p; 6867 } 6868 6869 static void nfs4_locku_release_calldata(void *data) 6870 { 6871 struct nfs4_unlockdata *calldata = data; 6872 nfs_free_seqid(calldata->arg.seqid); 6873 nfs4_put_lock_state(calldata->lsp); 6874 nfs_put_lock_context(calldata->l_ctx); 6875 put_nfs_open_context(calldata->ctx); 6876 kfree(calldata); 6877 } 6878 6879 static void nfs4_locku_done(struct rpc_task *task, void *data) 6880 { 6881 struct nfs4_unlockdata *calldata = data; 6882 struct nfs4_exception exception = { 6883 .inode = calldata->lsp->ls_state->inode, 6884 .stateid = &calldata->arg.stateid, 6885 }; 6886 6887 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6888 return; 6889 switch (task->tk_status) { 6890 case 0: 6891 renew_lease(calldata->server, calldata->timestamp); 6892 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6893 if (nfs4_update_lock_stateid(calldata->lsp, 6894 &calldata->res.stateid)) 6895 break; 6896 fallthrough; 6897 case -NFS4ERR_ADMIN_REVOKED: 6898 case -NFS4ERR_EXPIRED: 6899 nfs4_free_revoked_stateid(calldata->server, 6900 &calldata->arg.stateid, 6901 task->tk_msg.rpc_cred); 6902 fallthrough; 6903 case -NFS4ERR_BAD_STATEID: 6904 case -NFS4ERR_STALE_STATEID: 6905 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6906 calldata->lsp)) 6907 rpc_restart_call_prepare(task); 6908 break; 6909 case -NFS4ERR_OLD_STATEID: 6910 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6911 calldata->lsp)) 6912 rpc_restart_call_prepare(task); 6913 break; 6914 default: 6915 task->tk_status = nfs4_async_handle_exception(task, 6916 calldata->server, task->tk_status, 6917 &exception); 6918 if (exception.retry) 6919 rpc_restart_call_prepare(task); 6920 } 6921 nfs_release_seqid(calldata->arg.seqid); 6922 } 6923 6924 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6925 { 6926 struct nfs4_unlockdata *calldata = data; 6927 6928 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6929 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6930 return; 6931 6932 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6933 goto out_wait; 6934 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6935 /* Note: exit _without_ running nfs4_locku_done */ 6936 goto out_no_action; 6937 } 6938 calldata->timestamp = jiffies; 6939 if (nfs4_setup_sequence(calldata->server->nfs_client, 6940 &calldata->arg.seq_args, 6941 &calldata->res.seq_res, 6942 task) != 0) 6943 nfs_release_seqid(calldata->arg.seqid); 6944 return; 6945 out_no_action: 6946 task->tk_action = NULL; 6947 out_wait: 6948 nfs4_sequence_done(task, &calldata->res.seq_res); 6949 } 6950 6951 static const struct rpc_call_ops nfs4_locku_ops = { 6952 .rpc_call_prepare = nfs4_locku_prepare, 6953 .rpc_call_done = nfs4_locku_done, 6954 .rpc_release = nfs4_locku_release_calldata, 6955 }; 6956 6957 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6958 struct nfs_open_context *ctx, 6959 struct nfs4_lock_state *lsp, 6960 struct nfs_seqid *seqid) 6961 { 6962 struct nfs4_unlockdata *data; 6963 struct rpc_message msg = { 6964 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6965 .rpc_cred = ctx->cred, 6966 }; 6967 struct rpc_task_setup task_setup_data = { 6968 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6969 .rpc_message = &msg, 6970 .callback_ops = &nfs4_locku_ops, 6971 .workqueue = nfsiod_workqueue, 6972 .flags = RPC_TASK_ASYNC, 6973 }; 6974 6975 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6976 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6977 6978 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6979 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6980 6981 /* Ensure this is an unlock - when canceling a lock, the 6982 * canceled lock is passed in, and it won't be an unlock. 6983 */ 6984 fl->fl_type = F_UNLCK; 6985 if (fl->fl_flags & FL_CLOSE) 6986 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6987 6988 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6989 if (data == NULL) { 6990 nfs_free_seqid(seqid); 6991 return ERR_PTR(-ENOMEM); 6992 } 6993 6994 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6995 msg.rpc_argp = &data->arg; 6996 msg.rpc_resp = &data->res; 6997 task_setup_data.callback_data = data; 6998 return rpc_run_task(&task_setup_data); 6999 } 7000 7001 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7002 { 7003 struct inode *inode = state->inode; 7004 struct nfs4_state_owner *sp = state->owner; 7005 struct nfs_inode *nfsi = NFS_I(inode); 7006 struct nfs_seqid *seqid; 7007 struct nfs4_lock_state *lsp; 7008 struct rpc_task *task; 7009 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7010 int status = 0; 7011 unsigned char fl_flags = request->fl_flags; 7012 7013 status = nfs4_set_lock_state(state, request); 7014 /* Unlock _before_ we do the RPC call */ 7015 request->fl_flags |= FL_EXISTS; 7016 /* Exclude nfs_delegation_claim_locks() */ 7017 mutex_lock(&sp->so_delegreturn_mutex); 7018 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7019 down_read(&nfsi->rwsem); 7020 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7021 up_read(&nfsi->rwsem); 7022 mutex_unlock(&sp->so_delegreturn_mutex); 7023 goto out; 7024 } 7025 lsp = request->fl_u.nfs4_fl.owner; 7026 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7027 up_read(&nfsi->rwsem); 7028 mutex_unlock(&sp->so_delegreturn_mutex); 7029 if (status != 0) 7030 goto out; 7031 /* Is this a delegated lock? */ 7032 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7033 goto out; 7034 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7035 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7036 status = -ENOMEM; 7037 if (IS_ERR(seqid)) 7038 goto out; 7039 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7040 status = PTR_ERR(task); 7041 if (IS_ERR(task)) 7042 goto out; 7043 status = rpc_wait_for_completion_task(task); 7044 rpc_put_task(task); 7045 out: 7046 request->fl_flags = fl_flags; 7047 trace_nfs4_unlock(request, state, F_SETLK, status); 7048 return status; 7049 } 7050 7051 struct nfs4_lockdata { 7052 struct nfs_lock_args arg; 7053 struct nfs_lock_res res; 7054 struct nfs4_lock_state *lsp; 7055 struct nfs_open_context *ctx; 7056 struct file_lock fl; 7057 unsigned long timestamp; 7058 int rpc_status; 7059 int cancelled; 7060 struct nfs_server *server; 7061 }; 7062 7063 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7064 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7065 gfp_t gfp_mask) 7066 { 7067 struct nfs4_lockdata *p; 7068 struct inode *inode = lsp->ls_state->inode; 7069 struct nfs_server *server = NFS_SERVER(inode); 7070 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7071 7072 p = kzalloc(sizeof(*p), gfp_mask); 7073 if (p == NULL) 7074 return NULL; 7075 7076 p->arg.fh = NFS_FH(inode); 7077 p->arg.fl = &p->fl; 7078 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7079 if (IS_ERR(p->arg.open_seqid)) 7080 goto out_free; 7081 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7082 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7083 if (IS_ERR(p->arg.lock_seqid)) 7084 goto out_free_seqid; 7085 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7086 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7087 p->arg.lock_owner.s_dev = server->s_dev; 7088 p->res.lock_seqid = p->arg.lock_seqid; 7089 p->lsp = lsp; 7090 p->server = server; 7091 p->ctx = get_nfs_open_context(ctx); 7092 locks_init_lock(&p->fl); 7093 locks_copy_lock(&p->fl, fl); 7094 return p; 7095 out_free_seqid: 7096 nfs_free_seqid(p->arg.open_seqid); 7097 out_free: 7098 kfree(p); 7099 return NULL; 7100 } 7101 7102 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7103 { 7104 struct nfs4_lockdata *data = calldata; 7105 struct nfs4_state *state = data->lsp->ls_state; 7106 7107 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7108 goto out_wait; 7109 /* Do we need to do an open_to_lock_owner? */ 7110 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7111 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7112 goto out_release_lock_seqid; 7113 } 7114 nfs4_stateid_copy(&data->arg.open_stateid, 7115 &state->open_stateid); 7116 data->arg.new_lock_owner = 1; 7117 data->res.open_seqid = data->arg.open_seqid; 7118 } else { 7119 data->arg.new_lock_owner = 0; 7120 nfs4_stateid_copy(&data->arg.lock_stateid, 7121 &data->lsp->ls_stateid); 7122 } 7123 if (!nfs4_valid_open_stateid(state)) { 7124 data->rpc_status = -EBADF; 7125 task->tk_action = NULL; 7126 goto out_release_open_seqid; 7127 } 7128 data->timestamp = jiffies; 7129 if (nfs4_setup_sequence(data->server->nfs_client, 7130 &data->arg.seq_args, 7131 &data->res.seq_res, 7132 task) == 0) 7133 return; 7134 out_release_open_seqid: 7135 nfs_release_seqid(data->arg.open_seqid); 7136 out_release_lock_seqid: 7137 nfs_release_seqid(data->arg.lock_seqid); 7138 out_wait: 7139 nfs4_sequence_done(task, &data->res.seq_res); 7140 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7141 } 7142 7143 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7144 { 7145 struct nfs4_lockdata *data = calldata; 7146 struct nfs4_lock_state *lsp = data->lsp; 7147 struct nfs_server *server = NFS_SERVER(d_inode(data->ctx->dentry)); 7148 7149 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7150 return; 7151 7152 data->rpc_status = task->tk_status; 7153 switch (task->tk_status) { 7154 case 0: 7155 renew_lease(server, data->timestamp); 7156 if (data->arg.new_lock && !data->cancelled) { 7157 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7158 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7159 goto out_restart; 7160 } 7161 if (data->arg.new_lock_owner != 0) { 7162 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7163 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7164 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7165 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7166 goto out_restart; 7167 break; 7168 case -NFS4ERR_BAD_STATEID: 7169 case -NFS4ERR_OLD_STATEID: 7170 case -NFS4ERR_STALE_STATEID: 7171 case -NFS4ERR_EXPIRED: 7172 if (data->arg.new_lock_owner != 0) { 7173 if (!nfs4_stateid_match(&data->arg.open_stateid, 7174 &lsp->ls_state->open_stateid)) 7175 goto out_restart; 7176 else if (nfs4_async_handle_error(task, server, lsp->ls_state, NULL) == -EAGAIN) 7177 goto out_restart; 7178 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7179 &lsp->ls_stateid)) 7180 goto out_restart; 7181 } 7182 out_done: 7183 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7184 return; 7185 out_restart: 7186 if (!data->cancelled) 7187 rpc_restart_call_prepare(task); 7188 goto out_done; 7189 } 7190 7191 static void nfs4_lock_release(void *calldata) 7192 { 7193 struct nfs4_lockdata *data = calldata; 7194 7195 nfs_free_seqid(data->arg.open_seqid); 7196 if (data->cancelled && data->rpc_status == 0) { 7197 struct rpc_task *task; 7198 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7199 data->arg.lock_seqid); 7200 if (!IS_ERR(task)) 7201 rpc_put_task_async(task); 7202 dprintk("%s: cancelling lock!\n", __func__); 7203 } else 7204 nfs_free_seqid(data->arg.lock_seqid); 7205 nfs4_put_lock_state(data->lsp); 7206 put_nfs_open_context(data->ctx); 7207 kfree(data); 7208 } 7209 7210 static const struct rpc_call_ops nfs4_lock_ops = { 7211 .rpc_call_prepare = nfs4_lock_prepare, 7212 .rpc_call_done = nfs4_lock_done, 7213 .rpc_release = nfs4_lock_release, 7214 }; 7215 7216 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7217 { 7218 switch (error) { 7219 case -NFS4ERR_ADMIN_REVOKED: 7220 case -NFS4ERR_EXPIRED: 7221 case -NFS4ERR_BAD_STATEID: 7222 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7223 if (new_lock_owner != 0 || 7224 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7225 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7226 break; 7227 case -NFS4ERR_STALE_STATEID: 7228 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7229 nfs4_schedule_lease_recovery(server->nfs_client); 7230 } 7231 } 7232 7233 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7234 { 7235 struct nfs4_lockdata *data; 7236 struct rpc_task *task; 7237 struct rpc_message msg = { 7238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7239 .rpc_cred = state->owner->so_cred, 7240 }; 7241 struct rpc_task_setup task_setup_data = { 7242 .rpc_client = NFS_CLIENT(state->inode), 7243 .rpc_message = &msg, 7244 .callback_ops = &nfs4_lock_ops, 7245 .workqueue = nfsiod_workqueue, 7246 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7247 }; 7248 int ret; 7249 7250 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7251 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7252 7253 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7254 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7255 if (data == NULL) 7256 return -ENOMEM; 7257 if (IS_SETLKW(cmd)) 7258 data->arg.block = 1; 7259 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7260 recovery_type > NFS_LOCK_NEW); 7261 msg.rpc_argp = &data->arg; 7262 msg.rpc_resp = &data->res; 7263 task_setup_data.callback_data = data; 7264 if (recovery_type > NFS_LOCK_NEW) { 7265 if (recovery_type == NFS_LOCK_RECLAIM) 7266 data->arg.reclaim = NFS_LOCK_RECLAIM; 7267 } else 7268 data->arg.new_lock = 1; 7269 task = rpc_run_task(&task_setup_data); 7270 if (IS_ERR(task)) 7271 return PTR_ERR(task); 7272 ret = rpc_wait_for_completion_task(task); 7273 if (ret == 0) { 7274 ret = data->rpc_status; 7275 if (ret) 7276 nfs4_handle_setlk_error(data->server, data->lsp, 7277 data->arg.new_lock_owner, ret); 7278 } else 7279 data->cancelled = true; 7280 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7281 rpc_put_task(task); 7282 dprintk("%s: ret = %d\n", __func__, ret); 7283 return ret; 7284 } 7285 7286 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7287 { 7288 struct nfs_server *server = NFS_SERVER(state->inode); 7289 struct nfs4_exception exception = { 7290 .inode = state->inode, 7291 }; 7292 int err; 7293 7294 do { 7295 /* Cache the lock if possible... */ 7296 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7297 return 0; 7298 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7299 if (err != -NFS4ERR_DELAY) 7300 break; 7301 nfs4_handle_exception(server, err, &exception); 7302 } while (exception.retry); 7303 return err; 7304 } 7305 7306 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7307 { 7308 struct nfs_server *server = NFS_SERVER(state->inode); 7309 struct nfs4_exception exception = { 7310 .inode = state->inode, 7311 }; 7312 int err; 7313 7314 err = nfs4_set_lock_state(state, request); 7315 if (err != 0) 7316 return err; 7317 if (!recover_lost_locks) { 7318 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7319 return 0; 7320 } 7321 do { 7322 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7323 return 0; 7324 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7325 switch (err) { 7326 default: 7327 goto out; 7328 case -NFS4ERR_GRACE: 7329 case -NFS4ERR_DELAY: 7330 nfs4_handle_exception(server, err, &exception); 7331 err = 0; 7332 } 7333 } while (exception.retry); 7334 out: 7335 return err; 7336 } 7337 7338 #if defined(CONFIG_NFS_V4_1) 7339 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7340 { 7341 struct nfs4_lock_state *lsp; 7342 int status; 7343 7344 status = nfs4_set_lock_state(state, request); 7345 if (status != 0) 7346 return status; 7347 lsp = request->fl_u.nfs4_fl.owner; 7348 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7349 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7350 return 0; 7351 return nfs4_lock_expired(state, request); 7352 } 7353 #endif 7354 7355 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7356 { 7357 struct nfs_inode *nfsi = NFS_I(state->inode); 7358 struct nfs4_state_owner *sp = state->owner; 7359 unsigned char fl_flags = request->fl_flags; 7360 int status; 7361 7362 request->fl_flags |= FL_ACCESS; 7363 status = locks_lock_inode_wait(state->inode, request); 7364 if (status < 0) 7365 goto out; 7366 mutex_lock(&sp->so_delegreturn_mutex); 7367 down_read(&nfsi->rwsem); 7368 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7369 /* Yes: cache locks! */ 7370 /* ...but avoid races with delegation recall... */ 7371 request->fl_flags = fl_flags & ~FL_SLEEP; 7372 status = locks_lock_inode_wait(state->inode, request); 7373 up_read(&nfsi->rwsem); 7374 mutex_unlock(&sp->so_delegreturn_mutex); 7375 goto out; 7376 } 7377 up_read(&nfsi->rwsem); 7378 mutex_unlock(&sp->so_delegreturn_mutex); 7379 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7380 out: 7381 request->fl_flags = fl_flags; 7382 return status; 7383 } 7384 7385 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7386 { 7387 struct nfs4_exception exception = { 7388 .state = state, 7389 .inode = state->inode, 7390 .interruptible = true, 7391 }; 7392 int err; 7393 7394 do { 7395 err = _nfs4_proc_setlk(state, cmd, request); 7396 if (err == -NFS4ERR_DENIED) 7397 err = -EAGAIN; 7398 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7399 err, &exception); 7400 } while (exception.retry); 7401 return err; 7402 } 7403 7404 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7405 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7406 7407 static int 7408 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7409 struct file_lock *request) 7410 { 7411 int status = -ERESTARTSYS; 7412 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7413 7414 while(!signalled()) { 7415 status = nfs4_proc_setlk(state, cmd, request); 7416 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7417 break; 7418 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7419 schedule_timeout(timeout); 7420 timeout *= 2; 7421 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7422 status = -ERESTARTSYS; 7423 } 7424 return status; 7425 } 7426 7427 #ifdef CONFIG_NFS_V4_1 7428 struct nfs4_lock_waiter { 7429 struct inode *inode; 7430 struct nfs_lowner owner; 7431 wait_queue_entry_t wait; 7432 }; 7433 7434 static int 7435 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7436 { 7437 struct nfs4_lock_waiter *waiter = 7438 container_of(wait, struct nfs4_lock_waiter, wait); 7439 7440 /* NULL key means to wake up everyone */ 7441 if (key) { 7442 struct cb_notify_lock_args *cbnl = key; 7443 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7444 *wowner = &waiter->owner; 7445 7446 /* Only wake if the callback was for the same owner. */ 7447 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7448 return 0; 7449 7450 /* Make sure it's for the right inode */ 7451 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7452 return 0; 7453 } 7454 7455 return woken_wake_function(wait, mode, flags, key); 7456 } 7457 7458 static int 7459 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7460 { 7461 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7462 struct nfs_server *server = NFS_SERVER(state->inode); 7463 struct nfs_client *clp = server->nfs_client; 7464 wait_queue_head_t *q = &clp->cl_lock_waitq; 7465 struct nfs4_lock_waiter waiter = { 7466 .inode = state->inode, 7467 .owner = { .clientid = clp->cl_clientid, 7468 .id = lsp->ls_seqid.owner_id, 7469 .s_dev = server->s_dev }, 7470 }; 7471 int status; 7472 7473 /* Don't bother with waitqueue if we don't expect a callback */ 7474 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7475 return nfs4_retry_setlk_simple(state, cmd, request); 7476 7477 init_wait(&waiter.wait); 7478 waiter.wait.func = nfs4_wake_lock_waiter; 7479 add_wait_queue(q, &waiter.wait); 7480 7481 do { 7482 status = nfs4_proc_setlk(state, cmd, request); 7483 if (status != -EAGAIN || IS_SETLK(cmd)) 7484 break; 7485 7486 status = -ERESTARTSYS; 7487 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7488 NFS4_LOCK_MAXTIMEOUT); 7489 } while (!signalled()); 7490 7491 remove_wait_queue(q, &waiter.wait); 7492 7493 return status; 7494 } 7495 #else /* !CONFIG_NFS_V4_1 */ 7496 static inline int 7497 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7498 { 7499 return nfs4_retry_setlk_simple(state, cmd, request); 7500 } 7501 #endif 7502 7503 static int 7504 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7505 { 7506 struct nfs_open_context *ctx; 7507 struct nfs4_state *state; 7508 int status; 7509 7510 /* verify open state */ 7511 ctx = nfs_file_open_context(filp); 7512 state = ctx->state; 7513 7514 if (IS_GETLK(cmd)) { 7515 if (state != NULL) 7516 return nfs4_proc_getlk(state, F_GETLK, request); 7517 return 0; 7518 } 7519 7520 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7521 return -EINVAL; 7522 7523 if (request->fl_type == F_UNLCK) { 7524 if (state != NULL) 7525 return nfs4_proc_unlck(state, cmd, request); 7526 return 0; 7527 } 7528 7529 if (state == NULL) 7530 return -ENOLCK; 7531 7532 if ((request->fl_flags & FL_POSIX) && 7533 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7534 return -ENOLCK; 7535 7536 /* 7537 * Don't rely on the VFS having checked the file open mode, 7538 * since it won't do this for flock() locks. 7539 */ 7540 switch (request->fl_type) { 7541 case F_RDLCK: 7542 if (!(filp->f_mode & FMODE_READ)) 7543 return -EBADF; 7544 break; 7545 case F_WRLCK: 7546 if (!(filp->f_mode & FMODE_WRITE)) 7547 return -EBADF; 7548 } 7549 7550 status = nfs4_set_lock_state(state, request); 7551 if (status != 0) 7552 return status; 7553 7554 return nfs4_retry_setlk(state, cmd, request); 7555 } 7556 7557 static int nfs4_delete_lease(struct file *file, void **priv) 7558 { 7559 return generic_setlease(file, F_UNLCK, NULL, priv); 7560 } 7561 7562 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease, 7563 void **priv) 7564 { 7565 struct inode *inode = file_inode(file); 7566 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7567 int ret; 7568 7569 /* No delegation, no lease */ 7570 if (!nfs4_have_delegation(inode, type)) 7571 return -EAGAIN; 7572 ret = generic_setlease(file, arg, lease, priv); 7573 if (ret || nfs4_have_delegation(inode, type)) 7574 return ret; 7575 /* We raced with a delegation return */ 7576 nfs4_delete_lease(file, priv); 7577 return -EAGAIN; 7578 } 7579 7580 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease, 7581 void **priv) 7582 { 7583 switch (arg) { 7584 case F_RDLCK: 7585 case F_WRLCK: 7586 return nfs4_add_lease(file, arg, lease, priv); 7587 case F_UNLCK: 7588 return nfs4_delete_lease(file, priv); 7589 default: 7590 return -EINVAL; 7591 } 7592 } 7593 7594 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7595 { 7596 struct nfs_server *server = NFS_SERVER(state->inode); 7597 int err; 7598 7599 err = nfs4_set_lock_state(state, fl); 7600 if (err != 0) 7601 return err; 7602 do { 7603 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7604 if (err != -NFS4ERR_DELAY) 7605 break; 7606 ssleep(1); 7607 } while (err == -NFS4ERR_DELAY); 7608 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7609 } 7610 7611 struct nfs_release_lockowner_data { 7612 struct nfs4_lock_state *lsp; 7613 struct nfs_server *server; 7614 struct nfs_release_lockowner_args args; 7615 struct nfs_release_lockowner_res res; 7616 unsigned long timestamp; 7617 }; 7618 7619 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7620 { 7621 struct nfs_release_lockowner_data *data = calldata; 7622 struct nfs_server *server = data->server; 7623 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7624 &data->res.seq_res, task); 7625 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7626 data->timestamp = jiffies; 7627 } 7628 7629 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7630 { 7631 struct nfs_release_lockowner_data *data = calldata; 7632 struct nfs_server *server = data->server; 7633 7634 nfs40_sequence_done(task, &data->res.seq_res); 7635 7636 switch (task->tk_status) { 7637 case 0: 7638 renew_lease(server, data->timestamp); 7639 break; 7640 case -NFS4ERR_STALE_CLIENTID: 7641 case -NFS4ERR_EXPIRED: 7642 nfs4_schedule_lease_recovery(server->nfs_client); 7643 break; 7644 case -NFS4ERR_LEASE_MOVED: 7645 case -NFS4ERR_DELAY: 7646 if (nfs4_async_handle_error(task, server, 7647 NULL, NULL) == -EAGAIN) 7648 rpc_restart_call_prepare(task); 7649 } 7650 } 7651 7652 static void nfs4_release_lockowner_release(void *calldata) 7653 { 7654 struct nfs_release_lockowner_data *data = calldata; 7655 nfs4_free_lock_state(data->server, data->lsp); 7656 kfree(calldata); 7657 } 7658 7659 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7660 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7661 .rpc_call_done = nfs4_release_lockowner_done, 7662 .rpc_release = nfs4_release_lockowner_release, 7663 }; 7664 7665 static void 7666 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7667 { 7668 struct nfs_release_lockowner_data *data; 7669 struct rpc_message msg = { 7670 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7671 }; 7672 7673 if (server->nfs_client->cl_mvops->minor_version != 0) 7674 return; 7675 7676 data = kmalloc(sizeof(*data), GFP_KERNEL); 7677 if (!data) 7678 return; 7679 data->lsp = lsp; 7680 data->server = server; 7681 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7682 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7683 data->args.lock_owner.s_dev = server->s_dev; 7684 7685 msg.rpc_argp = &data->args; 7686 msg.rpc_resp = &data->res; 7687 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7688 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7689 } 7690 7691 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7692 7693 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7694 struct mnt_idmap *idmap, 7695 struct dentry *unused, struct inode *inode, 7696 const char *key, const void *buf, 7697 size_t buflen, int flags) 7698 { 7699 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7700 } 7701 7702 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7703 struct dentry *unused, struct inode *inode, 7704 const char *key, void *buf, size_t buflen) 7705 { 7706 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7707 } 7708 7709 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7710 { 7711 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7712 } 7713 7714 #if defined(CONFIG_NFS_V4_1) 7715 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7716 7717 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7718 struct mnt_idmap *idmap, 7719 struct dentry *unused, struct inode *inode, 7720 const char *key, const void *buf, 7721 size_t buflen, int flags) 7722 { 7723 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7724 } 7725 7726 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7727 struct dentry *unused, struct inode *inode, 7728 const char *key, void *buf, size_t buflen) 7729 { 7730 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7731 } 7732 7733 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7734 { 7735 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7736 } 7737 7738 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7739 7740 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7741 struct mnt_idmap *idmap, 7742 struct dentry *unused, struct inode *inode, 7743 const char *key, const void *buf, 7744 size_t buflen, int flags) 7745 { 7746 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7747 } 7748 7749 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7750 struct dentry *unused, struct inode *inode, 7751 const char *key, void *buf, size_t buflen) 7752 { 7753 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7754 } 7755 7756 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7757 { 7758 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7759 } 7760 7761 #endif 7762 7763 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7764 7765 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7766 struct mnt_idmap *idmap, 7767 struct dentry *unused, struct inode *inode, 7768 const char *key, const void *buf, 7769 size_t buflen, int flags) 7770 { 7771 if (security_ismaclabel(key)) 7772 return nfs4_set_security_label(inode, buf, buflen); 7773 7774 return -EOPNOTSUPP; 7775 } 7776 7777 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7778 struct dentry *unused, struct inode *inode, 7779 const char *key, void *buf, size_t buflen) 7780 { 7781 if (security_ismaclabel(key)) 7782 return nfs4_get_security_label(inode, buf, buflen); 7783 return -EOPNOTSUPP; 7784 } 7785 7786 static ssize_t 7787 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7788 { 7789 int len = 0; 7790 7791 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7792 len = security_inode_listsecurity(inode, list, list_len); 7793 if (len >= 0 && list_len && len > list_len) 7794 return -ERANGE; 7795 } 7796 return len; 7797 } 7798 7799 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7800 .prefix = XATTR_SECURITY_PREFIX, 7801 .get = nfs4_xattr_get_nfs4_label, 7802 .set = nfs4_xattr_set_nfs4_label, 7803 }; 7804 7805 #else 7806 7807 static ssize_t 7808 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7809 { 7810 return 0; 7811 } 7812 7813 #endif 7814 7815 #ifdef CONFIG_NFS_V4_2 7816 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7817 struct mnt_idmap *idmap, 7818 struct dentry *unused, struct inode *inode, 7819 const char *key, const void *buf, 7820 size_t buflen, int flags) 7821 { 7822 u32 mask; 7823 int ret; 7824 7825 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7826 return -EOPNOTSUPP; 7827 7828 /* 7829 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7830 * flags right now. Handling of xattr operations use the normal 7831 * file read/write permissions. 7832 * 7833 * Just in case the server has other ideas (which RFC 8276 allows), 7834 * do a cached access check for the XA* flags to possibly avoid 7835 * doing an RPC and getting EACCES back. 7836 */ 7837 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7838 if (!(mask & NFS_ACCESS_XAWRITE)) 7839 return -EACCES; 7840 } 7841 7842 if (buf == NULL) { 7843 ret = nfs42_proc_removexattr(inode, key); 7844 if (!ret) 7845 nfs4_xattr_cache_remove(inode, key); 7846 } else { 7847 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7848 if (!ret) 7849 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7850 } 7851 7852 return ret; 7853 } 7854 7855 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7856 struct dentry *unused, struct inode *inode, 7857 const char *key, void *buf, size_t buflen) 7858 { 7859 u32 mask; 7860 ssize_t ret; 7861 7862 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7863 return -EOPNOTSUPP; 7864 7865 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7866 if (!(mask & NFS_ACCESS_XAREAD)) 7867 return -EACCES; 7868 } 7869 7870 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7871 if (ret) 7872 return ret; 7873 7874 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7875 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7876 return ret; 7877 7878 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7879 7880 return ret; 7881 } 7882 7883 static ssize_t 7884 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7885 { 7886 u64 cookie; 7887 bool eof; 7888 ssize_t ret, size; 7889 char *buf; 7890 size_t buflen; 7891 u32 mask; 7892 7893 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7894 return 0; 7895 7896 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7897 if (!(mask & NFS_ACCESS_XALIST)) 7898 return 0; 7899 } 7900 7901 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7902 if (ret) 7903 return ret; 7904 7905 ret = nfs4_xattr_cache_list(inode, list, list_len); 7906 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7907 return ret; 7908 7909 cookie = 0; 7910 eof = false; 7911 buflen = list_len ? list_len : XATTR_LIST_MAX; 7912 buf = list_len ? list : NULL; 7913 size = 0; 7914 7915 while (!eof) { 7916 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7917 &cookie, &eof); 7918 if (ret < 0) 7919 return ret; 7920 7921 if (list_len) { 7922 buf += ret; 7923 buflen -= ret; 7924 } 7925 size += ret; 7926 } 7927 7928 if (list_len) 7929 nfs4_xattr_cache_set_list(inode, list, size); 7930 7931 return size; 7932 } 7933 7934 #else 7935 7936 static ssize_t 7937 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7938 { 7939 return 0; 7940 } 7941 #endif /* CONFIG_NFS_V4_2 */ 7942 7943 /* 7944 * nfs_fhget will use either the mounted_on_fileid or the fileid 7945 */ 7946 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7947 { 7948 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7949 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7950 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7951 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7952 return; 7953 7954 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7955 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7956 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7957 fattr->nlink = 2; 7958 } 7959 7960 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7961 const struct qstr *name, 7962 struct nfs4_fs_locations *fs_locations, 7963 struct page *page) 7964 { 7965 struct nfs_server *server = NFS_SERVER(dir); 7966 u32 bitmask[3]; 7967 struct nfs4_fs_locations_arg args = { 7968 .dir_fh = NFS_FH(dir), 7969 .name = name, 7970 .page = page, 7971 .bitmask = bitmask, 7972 }; 7973 struct nfs4_fs_locations_res res = { 7974 .fs_locations = fs_locations, 7975 }; 7976 struct rpc_message msg = { 7977 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7978 .rpc_argp = &args, 7979 .rpc_resp = &res, 7980 }; 7981 int status; 7982 7983 dprintk("%s: start\n", __func__); 7984 7985 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7986 bitmask[1] = nfs4_fattr_bitmap[1]; 7987 7988 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7989 * is not supported */ 7990 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7991 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7992 else 7993 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7994 7995 nfs_fattr_init(fs_locations->fattr); 7996 fs_locations->server = server; 7997 fs_locations->nlocations = 0; 7998 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7999 dprintk("%s: returned status = %d\n", __func__, status); 8000 return status; 8001 } 8002 8003 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8004 const struct qstr *name, 8005 struct nfs4_fs_locations *fs_locations, 8006 struct page *page) 8007 { 8008 struct nfs4_exception exception = { 8009 .interruptible = true, 8010 }; 8011 int err; 8012 do { 8013 err = _nfs4_proc_fs_locations(client, dir, name, 8014 fs_locations, page); 8015 trace_nfs4_get_fs_locations(dir, name, err); 8016 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8017 &exception); 8018 } while (exception.retry); 8019 return err; 8020 } 8021 8022 /* 8023 * This operation also signals the server that this client is 8024 * performing migration recovery. The server can stop returning 8025 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8026 * appended to this compound to identify the client ID which is 8027 * performing recovery. 8028 */ 8029 static int _nfs40_proc_get_locations(struct nfs_server *server, 8030 struct nfs_fh *fhandle, 8031 struct nfs4_fs_locations *locations, 8032 struct page *page, const struct cred *cred) 8033 { 8034 struct rpc_clnt *clnt = server->client; 8035 u32 bitmask[2] = { 8036 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8037 }; 8038 struct nfs4_fs_locations_arg args = { 8039 .clientid = server->nfs_client->cl_clientid, 8040 .fh = fhandle, 8041 .page = page, 8042 .bitmask = bitmask, 8043 .migration = 1, /* skip LOOKUP */ 8044 .renew = 1, /* append RENEW */ 8045 }; 8046 struct nfs4_fs_locations_res res = { 8047 .fs_locations = locations, 8048 .migration = 1, 8049 .renew = 1, 8050 }; 8051 struct rpc_message msg = { 8052 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8053 .rpc_argp = &args, 8054 .rpc_resp = &res, 8055 .rpc_cred = cred, 8056 }; 8057 unsigned long now = jiffies; 8058 int status; 8059 8060 nfs_fattr_init(locations->fattr); 8061 locations->server = server; 8062 locations->nlocations = 0; 8063 8064 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8065 status = nfs4_call_sync_sequence(clnt, server, &msg, 8066 &args.seq_args, &res.seq_res); 8067 if (status) 8068 return status; 8069 8070 renew_lease(server, now); 8071 return 0; 8072 } 8073 8074 #ifdef CONFIG_NFS_V4_1 8075 8076 /* 8077 * This operation also signals the server that this client is 8078 * performing migration recovery. The server can stop asserting 8079 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8080 * performing this operation is identified in the SEQUENCE 8081 * operation in this compound. 8082 * 8083 * When the client supports GETATTR(fs_locations_info), it can 8084 * be plumbed in here. 8085 */ 8086 static int _nfs41_proc_get_locations(struct nfs_server *server, 8087 struct nfs_fh *fhandle, 8088 struct nfs4_fs_locations *locations, 8089 struct page *page, const struct cred *cred) 8090 { 8091 struct rpc_clnt *clnt = server->client; 8092 u32 bitmask[2] = { 8093 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8094 }; 8095 struct nfs4_fs_locations_arg args = { 8096 .fh = fhandle, 8097 .page = page, 8098 .bitmask = bitmask, 8099 .migration = 1, /* skip LOOKUP */ 8100 }; 8101 struct nfs4_fs_locations_res res = { 8102 .fs_locations = locations, 8103 .migration = 1, 8104 }; 8105 struct rpc_message msg = { 8106 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8107 .rpc_argp = &args, 8108 .rpc_resp = &res, 8109 .rpc_cred = cred, 8110 }; 8111 struct nfs4_call_sync_data data = { 8112 .seq_server = server, 8113 .seq_args = &args.seq_args, 8114 .seq_res = &res.seq_res, 8115 }; 8116 struct rpc_task_setup task_setup_data = { 8117 .rpc_client = clnt, 8118 .rpc_message = &msg, 8119 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8120 .callback_data = &data, 8121 .flags = RPC_TASK_NO_ROUND_ROBIN, 8122 }; 8123 int status; 8124 8125 nfs_fattr_init(locations->fattr); 8126 locations->server = server; 8127 locations->nlocations = 0; 8128 8129 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8130 status = nfs4_call_sync_custom(&task_setup_data); 8131 if (status == NFS4_OK && 8132 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8133 status = -NFS4ERR_LEASE_MOVED; 8134 return status; 8135 } 8136 8137 #endif /* CONFIG_NFS_V4_1 */ 8138 8139 /** 8140 * nfs4_proc_get_locations - discover locations for a migrated FSID 8141 * @server: pointer to nfs_server to process 8142 * @fhandle: pointer to the kernel NFS client file handle 8143 * @locations: result of query 8144 * @page: buffer 8145 * @cred: credential to use for this operation 8146 * 8147 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8148 * operation failed, or a negative errno if a local error occurred. 8149 * 8150 * On success, "locations" is filled in, but if the server has 8151 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8152 * asserted. 8153 * 8154 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8155 * from this client that require migration recovery. 8156 */ 8157 int nfs4_proc_get_locations(struct nfs_server *server, 8158 struct nfs_fh *fhandle, 8159 struct nfs4_fs_locations *locations, 8160 struct page *page, const struct cred *cred) 8161 { 8162 struct nfs_client *clp = server->nfs_client; 8163 const struct nfs4_mig_recovery_ops *ops = 8164 clp->cl_mvops->mig_recovery_ops; 8165 struct nfs4_exception exception = { 8166 .interruptible = true, 8167 }; 8168 int status; 8169 8170 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8171 (unsigned long long)server->fsid.major, 8172 (unsigned long long)server->fsid.minor, 8173 clp->cl_hostname); 8174 nfs_display_fhandle(fhandle, __func__); 8175 8176 do { 8177 status = ops->get_locations(server, fhandle, locations, page, 8178 cred); 8179 if (status != -NFS4ERR_DELAY) 8180 break; 8181 nfs4_handle_exception(server, status, &exception); 8182 } while (exception.retry); 8183 return status; 8184 } 8185 8186 /* 8187 * This operation also signals the server that this client is 8188 * performing "lease moved" recovery. The server can stop 8189 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8190 * is appended to this compound to identify the client ID which is 8191 * performing recovery. 8192 */ 8193 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8194 { 8195 struct nfs_server *server = NFS_SERVER(inode); 8196 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8197 struct rpc_clnt *clnt = server->client; 8198 struct nfs4_fsid_present_arg args = { 8199 .fh = NFS_FH(inode), 8200 .clientid = clp->cl_clientid, 8201 .renew = 1, /* append RENEW */ 8202 }; 8203 struct nfs4_fsid_present_res res = { 8204 .renew = 1, 8205 }; 8206 struct rpc_message msg = { 8207 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8208 .rpc_argp = &args, 8209 .rpc_resp = &res, 8210 .rpc_cred = cred, 8211 }; 8212 unsigned long now = jiffies; 8213 int status; 8214 8215 res.fh = nfs_alloc_fhandle(); 8216 if (res.fh == NULL) 8217 return -ENOMEM; 8218 8219 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8220 status = nfs4_call_sync_sequence(clnt, server, &msg, 8221 &args.seq_args, &res.seq_res); 8222 nfs_free_fhandle(res.fh); 8223 if (status) 8224 return status; 8225 8226 do_renew_lease(clp, now); 8227 return 0; 8228 } 8229 8230 #ifdef CONFIG_NFS_V4_1 8231 8232 /* 8233 * This operation also signals the server that this client is 8234 * performing "lease moved" recovery. The server can stop asserting 8235 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8236 * this operation is identified in the SEQUENCE operation in this 8237 * compound. 8238 */ 8239 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8240 { 8241 struct nfs_server *server = NFS_SERVER(inode); 8242 struct rpc_clnt *clnt = server->client; 8243 struct nfs4_fsid_present_arg args = { 8244 .fh = NFS_FH(inode), 8245 }; 8246 struct nfs4_fsid_present_res res = { 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 int status; 8255 8256 res.fh = nfs_alloc_fhandle(); 8257 if (res.fh == NULL) 8258 return -ENOMEM; 8259 8260 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8261 status = nfs4_call_sync_sequence(clnt, server, &msg, 8262 &args.seq_args, &res.seq_res); 8263 nfs_free_fhandle(res.fh); 8264 if (status == NFS4_OK && 8265 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8266 status = -NFS4ERR_LEASE_MOVED; 8267 return status; 8268 } 8269 8270 #endif /* CONFIG_NFS_V4_1 */ 8271 8272 /** 8273 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8274 * @inode: inode on FSID to check 8275 * @cred: credential to use for this operation 8276 * 8277 * Server indicates whether the FSID is present, moved, or not 8278 * recognized. This operation is necessary to clear a LEASE_MOVED 8279 * condition for this client ID. 8280 * 8281 * Returns NFS4_OK if the FSID is present on this server, 8282 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8283 * NFS4ERR code if some error occurred on the server, or a 8284 * negative errno if a local failure occurred. 8285 */ 8286 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8287 { 8288 struct nfs_server *server = NFS_SERVER(inode); 8289 struct nfs_client *clp = server->nfs_client; 8290 const struct nfs4_mig_recovery_ops *ops = 8291 clp->cl_mvops->mig_recovery_ops; 8292 struct nfs4_exception exception = { 8293 .interruptible = true, 8294 }; 8295 int status; 8296 8297 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8298 (unsigned long long)server->fsid.major, 8299 (unsigned long long)server->fsid.minor, 8300 clp->cl_hostname); 8301 nfs_display_fhandle(NFS_FH(inode), __func__); 8302 8303 do { 8304 status = ops->fsid_present(inode, cred); 8305 if (status != -NFS4ERR_DELAY) 8306 break; 8307 nfs4_handle_exception(server, status, &exception); 8308 } while (exception.retry); 8309 return status; 8310 } 8311 8312 /* 8313 * If 'use_integrity' is true and the state managment nfs_client 8314 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8315 * and the machine credential as per RFC3530bis and RFC5661 Security 8316 * Considerations sections. Otherwise, just use the user cred with the 8317 * filesystem's rpc_client. 8318 */ 8319 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8320 { 8321 int status; 8322 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8323 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8324 struct nfs4_secinfo_arg args = { 8325 .dir_fh = NFS_FH(dir), 8326 .name = name, 8327 }; 8328 struct nfs4_secinfo_res res = { 8329 .flavors = flavors, 8330 }; 8331 struct rpc_message msg = { 8332 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8333 .rpc_argp = &args, 8334 .rpc_resp = &res, 8335 }; 8336 struct nfs4_call_sync_data data = { 8337 .seq_server = NFS_SERVER(dir), 8338 .seq_args = &args.seq_args, 8339 .seq_res = &res.seq_res, 8340 }; 8341 struct rpc_task_setup task_setup = { 8342 .rpc_client = clnt, 8343 .rpc_message = &msg, 8344 .callback_ops = clp->cl_mvops->call_sync_ops, 8345 .callback_data = &data, 8346 .flags = RPC_TASK_NO_ROUND_ROBIN, 8347 }; 8348 const struct cred *cred = NULL; 8349 8350 if (use_integrity) { 8351 clnt = clp->cl_rpcclient; 8352 task_setup.rpc_client = clnt; 8353 8354 cred = nfs4_get_clid_cred(clp); 8355 msg.rpc_cred = cred; 8356 } 8357 8358 dprintk("NFS call secinfo %s\n", name->name); 8359 8360 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8361 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8362 status = nfs4_call_sync_custom(&task_setup); 8363 8364 dprintk("NFS reply secinfo: %d\n", status); 8365 8366 put_cred(cred); 8367 return status; 8368 } 8369 8370 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8371 struct nfs4_secinfo_flavors *flavors) 8372 { 8373 struct nfs4_exception exception = { 8374 .interruptible = true, 8375 }; 8376 int err; 8377 do { 8378 err = -NFS4ERR_WRONGSEC; 8379 8380 /* try to use integrity protection with machine cred */ 8381 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8382 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8383 8384 /* 8385 * if unable to use integrity protection, or SECINFO with 8386 * integrity protection returns NFS4ERR_WRONGSEC (which is 8387 * disallowed by spec, but exists in deployed servers) use 8388 * the current filesystem's rpc_client and the user cred. 8389 */ 8390 if (err == -NFS4ERR_WRONGSEC) 8391 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8392 8393 trace_nfs4_secinfo(dir, name, err); 8394 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8395 &exception); 8396 } while (exception.retry); 8397 return err; 8398 } 8399 8400 #ifdef CONFIG_NFS_V4_1 8401 /* 8402 * Check the exchange flags returned by the server for invalid flags, having 8403 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8404 * DS flags set. 8405 */ 8406 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8407 { 8408 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8409 goto out_inval; 8410 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8411 goto out_inval; 8412 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8413 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8414 goto out_inval; 8415 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8416 goto out_inval; 8417 return NFS_OK; 8418 out_inval: 8419 return -NFS4ERR_INVAL; 8420 } 8421 8422 static bool 8423 nfs41_same_server_scope(struct nfs41_server_scope *a, 8424 struct nfs41_server_scope *b) 8425 { 8426 if (a->server_scope_sz != b->server_scope_sz) 8427 return false; 8428 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8429 } 8430 8431 static void 8432 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8433 { 8434 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8435 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8436 struct nfs_client *clp = args->client; 8437 8438 switch (task->tk_status) { 8439 case -NFS4ERR_BADSESSION: 8440 case -NFS4ERR_DEADSESSION: 8441 nfs4_schedule_session_recovery(clp->cl_session, 8442 task->tk_status); 8443 return; 8444 } 8445 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8446 res->dir != NFS4_CDFS4_BOTH) { 8447 rpc_task_close_connection(task); 8448 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8449 rpc_restart_call(task); 8450 } 8451 } 8452 8453 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8454 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8455 }; 8456 8457 /* 8458 * nfs4_proc_bind_one_conn_to_session() 8459 * 8460 * The 4.1 client currently uses the same TCP connection for the 8461 * fore and backchannel. 8462 */ 8463 static 8464 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8465 struct rpc_xprt *xprt, 8466 struct nfs_client *clp, 8467 const struct cred *cred) 8468 { 8469 int status; 8470 struct nfs41_bind_conn_to_session_args args = { 8471 .client = clp, 8472 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8473 .retries = 0, 8474 }; 8475 struct nfs41_bind_conn_to_session_res res; 8476 struct rpc_message msg = { 8477 .rpc_proc = 8478 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8479 .rpc_argp = &args, 8480 .rpc_resp = &res, 8481 .rpc_cred = cred, 8482 }; 8483 struct rpc_task_setup task_setup_data = { 8484 .rpc_client = clnt, 8485 .rpc_xprt = xprt, 8486 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8487 .rpc_message = &msg, 8488 .flags = RPC_TASK_TIMEOUT, 8489 }; 8490 struct rpc_task *task; 8491 8492 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8493 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8494 args.dir = NFS4_CDFC4_FORE; 8495 8496 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8497 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8498 args.dir = NFS4_CDFC4_FORE; 8499 8500 task = rpc_run_task(&task_setup_data); 8501 if (!IS_ERR(task)) { 8502 status = task->tk_status; 8503 rpc_put_task(task); 8504 } else 8505 status = PTR_ERR(task); 8506 trace_nfs4_bind_conn_to_session(clp, status); 8507 if (status == 0) { 8508 if (memcmp(res.sessionid.data, 8509 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8510 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8511 return -EIO; 8512 } 8513 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8514 dprintk("NFS: %s: Unexpected direction from server\n", 8515 __func__); 8516 return -EIO; 8517 } 8518 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8519 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8520 __func__); 8521 return -EIO; 8522 } 8523 } 8524 8525 return status; 8526 } 8527 8528 struct rpc_bind_conn_calldata { 8529 struct nfs_client *clp; 8530 const struct cred *cred; 8531 }; 8532 8533 static int 8534 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8535 struct rpc_xprt *xprt, 8536 void *calldata) 8537 { 8538 struct rpc_bind_conn_calldata *p = calldata; 8539 8540 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8541 } 8542 8543 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8544 { 8545 struct rpc_bind_conn_calldata data = { 8546 .clp = clp, 8547 .cred = cred, 8548 }; 8549 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8550 nfs4_proc_bind_conn_to_session_callback, &data); 8551 } 8552 8553 /* 8554 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8555 * and operations we'd like to see to enable certain features in the allow map 8556 */ 8557 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8558 .how = SP4_MACH_CRED, 8559 .enforce.u.words = { 8560 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8561 1 << (OP_EXCHANGE_ID - 32) | 8562 1 << (OP_CREATE_SESSION - 32) | 8563 1 << (OP_DESTROY_SESSION - 32) | 8564 1 << (OP_DESTROY_CLIENTID - 32) 8565 }, 8566 .allow.u.words = { 8567 [0] = 1 << (OP_CLOSE) | 8568 1 << (OP_OPEN_DOWNGRADE) | 8569 1 << (OP_LOCKU) | 8570 1 << (OP_DELEGRETURN) | 8571 1 << (OP_COMMIT), 8572 [1] = 1 << (OP_SECINFO - 32) | 8573 1 << (OP_SECINFO_NO_NAME - 32) | 8574 1 << (OP_LAYOUTRETURN - 32) | 8575 1 << (OP_TEST_STATEID - 32) | 8576 1 << (OP_FREE_STATEID - 32) | 8577 1 << (OP_WRITE - 32) 8578 } 8579 }; 8580 8581 /* 8582 * Select the state protection mode for client `clp' given the server results 8583 * from exchange_id in `sp'. 8584 * 8585 * Returns 0 on success, negative errno otherwise. 8586 */ 8587 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8588 struct nfs41_state_protection *sp) 8589 { 8590 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8591 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8592 1 << (OP_EXCHANGE_ID - 32) | 8593 1 << (OP_CREATE_SESSION - 32) | 8594 1 << (OP_DESTROY_SESSION - 32) | 8595 1 << (OP_DESTROY_CLIENTID - 32) 8596 }; 8597 unsigned long flags = 0; 8598 unsigned int i; 8599 int ret = 0; 8600 8601 if (sp->how == SP4_MACH_CRED) { 8602 /* Print state protect result */ 8603 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8604 for (i = 0; i <= LAST_NFS4_OP; i++) { 8605 if (test_bit(i, sp->enforce.u.longs)) 8606 dfprintk(MOUNT, " enforce op %d\n", i); 8607 if (test_bit(i, sp->allow.u.longs)) 8608 dfprintk(MOUNT, " allow op %d\n", i); 8609 } 8610 8611 /* make sure nothing is on enforce list that isn't supported */ 8612 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8613 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8614 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8615 ret = -EINVAL; 8616 goto out; 8617 } 8618 } 8619 8620 /* 8621 * Minimal mode - state operations are allowed to use machine 8622 * credential. Note this already happens by default, so the 8623 * client doesn't have to do anything more than the negotiation. 8624 * 8625 * NOTE: we don't care if EXCHANGE_ID is in the list - 8626 * we're already using the machine cred for exchange_id 8627 * and will never use a different cred. 8628 */ 8629 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8630 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8631 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8632 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8633 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8634 dfprintk(MOUNT, " minimal mode enabled\n"); 8635 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8636 } else { 8637 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8638 ret = -EINVAL; 8639 goto out; 8640 } 8641 8642 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8643 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8644 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8645 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8646 dfprintk(MOUNT, " cleanup mode enabled\n"); 8647 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8648 } 8649 8650 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8651 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8652 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8653 } 8654 8655 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8656 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8657 dfprintk(MOUNT, " secinfo mode enabled\n"); 8658 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8659 } 8660 8661 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8662 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8663 dfprintk(MOUNT, " stateid mode enabled\n"); 8664 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8665 } 8666 8667 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8668 dfprintk(MOUNT, " write mode enabled\n"); 8669 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8670 } 8671 8672 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8673 dfprintk(MOUNT, " commit mode enabled\n"); 8674 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8675 } 8676 } 8677 out: 8678 clp->cl_sp4_flags = flags; 8679 return ret; 8680 } 8681 8682 struct nfs41_exchange_id_data { 8683 struct nfs41_exchange_id_res res; 8684 struct nfs41_exchange_id_args args; 8685 }; 8686 8687 static void nfs4_exchange_id_release(void *data) 8688 { 8689 struct nfs41_exchange_id_data *cdata = 8690 (struct nfs41_exchange_id_data *)data; 8691 8692 nfs_put_client(cdata->args.client); 8693 kfree(cdata->res.impl_id); 8694 kfree(cdata->res.server_scope); 8695 kfree(cdata->res.server_owner); 8696 kfree(cdata); 8697 } 8698 8699 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8700 .rpc_release = nfs4_exchange_id_release, 8701 }; 8702 8703 /* 8704 * _nfs4_proc_exchange_id() 8705 * 8706 * Wrapper for EXCHANGE_ID operation. 8707 */ 8708 static struct rpc_task * 8709 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8710 u32 sp4_how, struct rpc_xprt *xprt) 8711 { 8712 struct rpc_message msg = { 8713 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8714 .rpc_cred = cred, 8715 }; 8716 struct rpc_task_setup task_setup_data = { 8717 .rpc_client = clp->cl_rpcclient, 8718 .callback_ops = &nfs4_exchange_id_call_ops, 8719 .rpc_message = &msg, 8720 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8721 }; 8722 struct nfs41_exchange_id_data *calldata; 8723 int status; 8724 8725 if (!refcount_inc_not_zero(&clp->cl_count)) 8726 return ERR_PTR(-EIO); 8727 8728 status = -ENOMEM; 8729 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8730 if (!calldata) 8731 goto out; 8732 8733 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8734 8735 status = nfs4_init_uniform_client_string(clp); 8736 if (status) 8737 goto out_calldata; 8738 8739 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8740 GFP_NOFS); 8741 status = -ENOMEM; 8742 if (unlikely(calldata->res.server_owner == NULL)) 8743 goto out_calldata; 8744 8745 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8746 GFP_NOFS); 8747 if (unlikely(calldata->res.server_scope == NULL)) 8748 goto out_server_owner; 8749 8750 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8751 if (unlikely(calldata->res.impl_id == NULL)) 8752 goto out_server_scope; 8753 8754 switch (sp4_how) { 8755 case SP4_NONE: 8756 calldata->args.state_protect.how = SP4_NONE; 8757 break; 8758 8759 case SP4_MACH_CRED: 8760 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8761 break; 8762 8763 default: 8764 /* unsupported! */ 8765 WARN_ON_ONCE(1); 8766 status = -EINVAL; 8767 goto out_impl_id; 8768 } 8769 if (xprt) { 8770 task_setup_data.rpc_xprt = xprt; 8771 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8772 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8773 sizeof(calldata->args.verifier.data)); 8774 } 8775 calldata->args.client = clp; 8776 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8777 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8778 #ifdef CONFIG_NFS_V4_1_MIGRATION 8779 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8780 #endif 8781 msg.rpc_argp = &calldata->args; 8782 msg.rpc_resp = &calldata->res; 8783 task_setup_data.callback_data = calldata; 8784 8785 return rpc_run_task(&task_setup_data); 8786 8787 out_impl_id: 8788 kfree(calldata->res.impl_id); 8789 out_server_scope: 8790 kfree(calldata->res.server_scope); 8791 out_server_owner: 8792 kfree(calldata->res.server_owner); 8793 out_calldata: 8794 kfree(calldata); 8795 out: 8796 nfs_put_client(clp); 8797 return ERR_PTR(status); 8798 } 8799 8800 /* 8801 * _nfs4_proc_exchange_id() 8802 * 8803 * Wrapper for EXCHANGE_ID operation. 8804 */ 8805 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8806 u32 sp4_how) 8807 { 8808 struct rpc_task *task; 8809 struct nfs41_exchange_id_args *argp; 8810 struct nfs41_exchange_id_res *resp; 8811 unsigned long now = jiffies; 8812 int status; 8813 8814 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8815 if (IS_ERR(task)) 8816 return PTR_ERR(task); 8817 8818 argp = task->tk_msg.rpc_argp; 8819 resp = task->tk_msg.rpc_resp; 8820 status = task->tk_status; 8821 if (status != 0) 8822 goto out; 8823 8824 status = nfs4_check_cl_exchange_flags(resp->flags, 8825 clp->cl_mvops->minor_version); 8826 if (status != 0) 8827 goto out; 8828 8829 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8830 if (status != 0) 8831 goto out; 8832 8833 do_renew_lease(clp, now); 8834 8835 clp->cl_clientid = resp->clientid; 8836 clp->cl_exchange_flags = resp->flags; 8837 clp->cl_seqid = resp->seqid; 8838 /* Client ID is not confirmed */ 8839 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8840 clear_bit(NFS4_SESSION_ESTABLISHED, 8841 &clp->cl_session->session_state); 8842 8843 if (clp->cl_serverscope != NULL && 8844 !nfs41_same_server_scope(clp->cl_serverscope, 8845 resp->server_scope)) { 8846 dprintk("%s: server_scope mismatch detected\n", 8847 __func__); 8848 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8849 } 8850 8851 swap(clp->cl_serverowner, resp->server_owner); 8852 swap(clp->cl_serverscope, resp->server_scope); 8853 swap(clp->cl_implid, resp->impl_id); 8854 8855 /* Save the EXCHANGE_ID verifier session trunk tests */ 8856 memcpy(clp->cl_confirm.data, argp->verifier.data, 8857 sizeof(clp->cl_confirm.data)); 8858 out: 8859 trace_nfs4_exchange_id(clp, status); 8860 rpc_put_task(task); 8861 return status; 8862 } 8863 8864 /* 8865 * nfs4_proc_exchange_id() 8866 * 8867 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8868 * 8869 * Since the clientid has expired, all compounds using sessions 8870 * associated with the stale clientid will be returning 8871 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8872 * be in some phase of session reset. 8873 * 8874 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8875 */ 8876 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8877 { 8878 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8879 int status; 8880 8881 /* try SP4_MACH_CRED if krb5i/p */ 8882 if (authflavor == RPC_AUTH_GSS_KRB5I || 8883 authflavor == RPC_AUTH_GSS_KRB5P) { 8884 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8885 if (!status) 8886 return 0; 8887 } 8888 8889 /* try SP4_NONE */ 8890 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8891 } 8892 8893 /** 8894 * nfs4_test_session_trunk 8895 * 8896 * This is an add_xprt_test() test function called from 8897 * rpc_clnt_setup_test_and_add_xprt. 8898 * 8899 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8900 * and is dereferrenced in nfs4_exchange_id_release 8901 * 8902 * Upon success, add the new transport to the rpc_clnt 8903 * 8904 * @clnt: struct rpc_clnt to get new transport 8905 * @xprt: the rpc_xprt to test 8906 * @data: call data for _nfs4_proc_exchange_id. 8907 */ 8908 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8909 void *data) 8910 { 8911 struct nfs4_add_xprt_data *adata = data; 8912 struct rpc_task *task; 8913 int status; 8914 8915 u32 sp4_how; 8916 8917 dprintk("--> %s try %s\n", __func__, 8918 xprt->address_strings[RPC_DISPLAY_ADDR]); 8919 8920 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8921 8922 /* Test connection for session trunking. Async exchange_id call */ 8923 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8924 if (IS_ERR(task)) 8925 return; 8926 8927 status = task->tk_status; 8928 if (status == 0) 8929 status = nfs4_detect_session_trunking(adata->clp, 8930 task->tk_msg.rpc_resp, xprt); 8931 8932 if (status == 0) 8933 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8934 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8935 (struct sockaddr *)&xprt->addr)) 8936 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8937 8938 rpc_put_task(task); 8939 } 8940 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8941 8942 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8943 const struct cred *cred) 8944 { 8945 struct rpc_message msg = { 8946 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8947 .rpc_argp = clp, 8948 .rpc_cred = cred, 8949 }; 8950 int status; 8951 8952 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8953 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8954 trace_nfs4_destroy_clientid(clp, status); 8955 if (status) 8956 dprintk("NFS: Got error %d from the server %s on " 8957 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8958 return status; 8959 } 8960 8961 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8962 const struct cred *cred) 8963 { 8964 unsigned int loop; 8965 int ret; 8966 8967 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8968 ret = _nfs4_proc_destroy_clientid(clp, cred); 8969 switch (ret) { 8970 case -NFS4ERR_DELAY: 8971 case -NFS4ERR_CLIENTID_BUSY: 8972 ssleep(1); 8973 break; 8974 default: 8975 return ret; 8976 } 8977 } 8978 return 0; 8979 } 8980 8981 int nfs4_destroy_clientid(struct nfs_client *clp) 8982 { 8983 const struct cred *cred; 8984 int ret = 0; 8985 8986 if (clp->cl_mvops->minor_version < 1) 8987 goto out; 8988 if (clp->cl_exchange_flags == 0) 8989 goto out; 8990 if (clp->cl_preserve_clid) 8991 goto out; 8992 cred = nfs4_get_clid_cred(clp); 8993 ret = nfs4_proc_destroy_clientid(clp, cred); 8994 put_cred(cred); 8995 switch (ret) { 8996 case 0: 8997 case -NFS4ERR_STALE_CLIENTID: 8998 clp->cl_exchange_flags = 0; 8999 } 9000 out: 9001 return ret; 9002 } 9003 9004 #endif /* CONFIG_NFS_V4_1 */ 9005 9006 struct nfs4_get_lease_time_data { 9007 struct nfs4_get_lease_time_args *args; 9008 struct nfs4_get_lease_time_res *res; 9009 struct nfs_client *clp; 9010 }; 9011 9012 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9013 void *calldata) 9014 { 9015 struct nfs4_get_lease_time_data *data = 9016 (struct nfs4_get_lease_time_data *)calldata; 9017 9018 /* just setup sequence, do not trigger session recovery 9019 since we're invoked within one */ 9020 nfs4_setup_sequence(data->clp, 9021 &data->args->la_seq_args, 9022 &data->res->lr_seq_res, 9023 task); 9024 } 9025 9026 /* 9027 * Called from nfs4_state_manager thread for session setup, so don't recover 9028 * from sequence operation or clientid errors. 9029 */ 9030 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9031 { 9032 struct nfs4_get_lease_time_data *data = 9033 (struct nfs4_get_lease_time_data *)calldata; 9034 9035 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9036 return; 9037 switch (task->tk_status) { 9038 case -NFS4ERR_DELAY: 9039 case -NFS4ERR_GRACE: 9040 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9041 task->tk_status = 0; 9042 fallthrough; 9043 case -NFS4ERR_RETRY_UNCACHED_REP: 9044 rpc_restart_call_prepare(task); 9045 return; 9046 } 9047 } 9048 9049 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9050 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9051 .rpc_call_done = nfs4_get_lease_time_done, 9052 }; 9053 9054 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9055 { 9056 struct nfs4_get_lease_time_args args; 9057 struct nfs4_get_lease_time_res res = { 9058 .lr_fsinfo = fsinfo, 9059 }; 9060 struct nfs4_get_lease_time_data data = { 9061 .args = &args, 9062 .res = &res, 9063 .clp = clp, 9064 }; 9065 struct rpc_message msg = { 9066 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9067 .rpc_argp = &args, 9068 .rpc_resp = &res, 9069 }; 9070 struct rpc_task_setup task_setup = { 9071 .rpc_client = clp->cl_rpcclient, 9072 .rpc_message = &msg, 9073 .callback_ops = &nfs4_get_lease_time_ops, 9074 .callback_data = &data, 9075 .flags = RPC_TASK_TIMEOUT, 9076 }; 9077 9078 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9079 return nfs4_call_sync_custom(&task_setup); 9080 } 9081 9082 #ifdef CONFIG_NFS_V4_1 9083 9084 /* 9085 * Initialize the values to be used by the client in CREATE_SESSION 9086 * If nfs4_init_session set the fore channel request and response sizes, 9087 * use them. 9088 * 9089 * Set the back channel max_resp_sz_cached to zero to force the client to 9090 * always set csa_cachethis to FALSE because the current implementation 9091 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9092 */ 9093 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9094 struct rpc_clnt *clnt) 9095 { 9096 unsigned int max_rqst_sz, max_resp_sz; 9097 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9098 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9099 9100 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9101 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9102 9103 /* Fore channel attributes */ 9104 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9105 args->fc_attrs.max_resp_sz = max_resp_sz; 9106 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9107 args->fc_attrs.max_reqs = max_session_slots; 9108 9109 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9110 "max_ops=%u max_reqs=%u\n", 9111 __func__, 9112 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9113 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9114 9115 /* Back channel attributes */ 9116 args->bc_attrs.max_rqst_sz = max_bc_payload; 9117 args->bc_attrs.max_resp_sz = max_bc_payload; 9118 args->bc_attrs.max_resp_sz_cached = 0; 9119 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9120 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9121 if (args->bc_attrs.max_reqs > max_bc_slots) 9122 args->bc_attrs.max_reqs = max_bc_slots; 9123 9124 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9125 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9126 __func__, 9127 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9128 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9129 args->bc_attrs.max_reqs); 9130 } 9131 9132 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9133 struct nfs41_create_session_res *res) 9134 { 9135 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9136 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9137 9138 if (rcvd->max_resp_sz > sent->max_resp_sz) 9139 return -EINVAL; 9140 /* 9141 * Our requested max_ops is the minimum we need; we're not 9142 * prepared to break up compounds into smaller pieces than that. 9143 * So, no point even trying to continue if the server won't 9144 * cooperate: 9145 */ 9146 if (rcvd->max_ops < sent->max_ops) 9147 return -EINVAL; 9148 if (rcvd->max_reqs == 0) 9149 return -EINVAL; 9150 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9151 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9152 return 0; 9153 } 9154 9155 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9156 struct nfs41_create_session_res *res) 9157 { 9158 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9159 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9160 9161 if (!(res->flags & SESSION4_BACK_CHAN)) 9162 goto out; 9163 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9164 return -EINVAL; 9165 if (rcvd->max_resp_sz < sent->max_resp_sz) 9166 return -EINVAL; 9167 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9168 return -EINVAL; 9169 if (rcvd->max_ops > sent->max_ops) 9170 return -EINVAL; 9171 if (rcvd->max_reqs > sent->max_reqs) 9172 return -EINVAL; 9173 out: 9174 return 0; 9175 } 9176 9177 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9178 struct nfs41_create_session_res *res) 9179 { 9180 int ret; 9181 9182 ret = nfs4_verify_fore_channel_attrs(args, res); 9183 if (ret) 9184 return ret; 9185 return nfs4_verify_back_channel_attrs(args, res); 9186 } 9187 9188 static void nfs4_update_session(struct nfs4_session *session, 9189 struct nfs41_create_session_res *res) 9190 { 9191 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9192 /* Mark client id and session as being confirmed */ 9193 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9194 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9195 session->flags = res->flags; 9196 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9197 if (res->flags & SESSION4_BACK_CHAN) 9198 memcpy(&session->bc_attrs, &res->bc_attrs, 9199 sizeof(session->bc_attrs)); 9200 } 9201 9202 static int _nfs4_proc_create_session(struct nfs_client *clp, 9203 const struct cred *cred) 9204 { 9205 struct nfs4_session *session = clp->cl_session; 9206 struct nfs41_create_session_args args = { 9207 .client = clp, 9208 .clientid = clp->cl_clientid, 9209 .seqid = clp->cl_seqid, 9210 .cb_program = NFS4_CALLBACK, 9211 }; 9212 struct nfs41_create_session_res res; 9213 9214 struct rpc_message msg = { 9215 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9216 .rpc_argp = &args, 9217 .rpc_resp = &res, 9218 .rpc_cred = cred, 9219 }; 9220 int status; 9221 9222 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9223 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9224 9225 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9226 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9227 trace_nfs4_create_session(clp, status); 9228 9229 switch (status) { 9230 case -NFS4ERR_STALE_CLIENTID: 9231 case -NFS4ERR_DELAY: 9232 case -ETIMEDOUT: 9233 case -EACCES: 9234 case -EAGAIN: 9235 goto out; 9236 } 9237 9238 clp->cl_seqid++; 9239 if (!status) { 9240 /* Verify the session's negotiated channel_attrs values */ 9241 status = nfs4_verify_channel_attrs(&args, &res); 9242 /* Increment the clientid slot sequence id */ 9243 if (status) 9244 goto out; 9245 nfs4_update_session(session, &res); 9246 } 9247 out: 9248 return status; 9249 } 9250 9251 /* 9252 * Issues a CREATE_SESSION operation to the server. 9253 * It is the responsibility of the caller to verify the session is 9254 * expired before calling this routine. 9255 */ 9256 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9257 { 9258 int status; 9259 unsigned *ptr; 9260 struct nfs4_session *session = clp->cl_session; 9261 struct nfs4_add_xprt_data xprtdata = { 9262 .clp = clp, 9263 }; 9264 struct rpc_add_xprt_test rpcdata = { 9265 .add_xprt_test = clp->cl_mvops->session_trunk, 9266 .data = &xprtdata, 9267 }; 9268 9269 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9270 9271 status = _nfs4_proc_create_session(clp, cred); 9272 if (status) 9273 goto out; 9274 9275 /* Init or reset the session slot tables */ 9276 status = nfs4_setup_session_slot_tables(session); 9277 dprintk("slot table setup returned %d\n", status); 9278 if (status) 9279 goto out; 9280 9281 ptr = (unsigned *)&session->sess_id.data[0]; 9282 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9283 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9284 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9285 out: 9286 return status; 9287 } 9288 9289 /* 9290 * Issue the over-the-wire RPC DESTROY_SESSION. 9291 * The caller must serialize access to this routine. 9292 */ 9293 int nfs4_proc_destroy_session(struct nfs4_session *session, 9294 const struct cred *cred) 9295 { 9296 struct rpc_message msg = { 9297 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9298 .rpc_argp = session, 9299 .rpc_cred = cred, 9300 }; 9301 int status = 0; 9302 9303 /* session is still being setup */ 9304 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9305 return 0; 9306 9307 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9308 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9309 trace_nfs4_destroy_session(session->clp, status); 9310 9311 if (status) 9312 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9313 "Session has been destroyed regardless...\n", status); 9314 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9315 return status; 9316 } 9317 9318 /* 9319 * Renew the cl_session lease. 9320 */ 9321 struct nfs4_sequence_data { 9322 struct nfs_client *clp; 9323 struct nfs4_sequence_args args; 9324 struct nfs4_sequence_res res; 9325 }; 9326 9327 static void nfs41_sequence_release(void *data) 9328 { 9329 struct nfs4_sequence_data *calldata = data; 9330 struct nfs_client *clp = calldata->clp; 9331 9332 if (refcount_read(&clp->cl_count) > 1) 9333 nfs4_schedule_state_renewal(clp); 9334 nfs_put_client(clp); 9335 kfree(calldata); 9336 } 9337 9338 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9339 { 9340 switch(task->tk_status) { 9341 case -NFS4ERR_DELAY: 9342 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9343 return -EAGAIN; 9344 default: 9345 nfs4_schedule_lease_recovery(clp); 9346 } 9347 return 0; 9348 } 9349 9350 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9351 { 9352 struct nfs4_sequence_data *calldata = data; 9353 struct nfs_client *clp = calldata->clp; 9354 9355 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9356 return; 9357 9358 trace_nfs4_sequence(clp, task->tk_status); 9359 if (task->tk_status < 0) { 9360 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9361 if (refcount_read(&clp->cl_count) == 1) 9362 return; 9363 9364 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9365 rpc_restart_call_prepare(task); 9366 return; 9367 } 9368 } 9369 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9370 } 9371 9372 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9373 { 9374 struct nfs4_sequence_data *calldata = data; 9375 struct nfs_client *clp = calldata->clp; 9376 struct nfs4_sequence_args *args; 9377 struct nfs4_sequence_res *res; 9378 9379 args = task->tk_msg.rpc_argp; 9380 res = task->tk_msg.rpc_resp; 9381 9382 nfs4_setup_sequence(clp, args, res, task); 9383 } 9384 9385 static const struct rpc_call_ops nfs41_sequence_ops = { 9386 .rpc_call_done = nfs41_sequence_call_done, 9387 .rpc_call_prepare = nfs41_sequence_prepare, 9388 .rpc_release = nfs41_sequence_release, 9389 }; 9390 9391 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9392 const struct cred *cred, 9393 struct nfs4_slot *slot, 9394 bool is_privileged) 9395 { 9396 struct nfs4_sequence_data *calldata; 9397 struct rpc_message msg = { 9398 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9399 .rpc_cred = cred, 9400 }; 9401 struct rpc_task_setup task_setup_data = { 9402 .rpc_client = clp->cl_rpcclient, 9403 .rpc_message = &msg, 9404 .callback_ops = &nfs41_sequence_ops, 9405 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9406 }; 9407 struct rpc_task *ret; 9408 9409 ret = ERR_PTR(-EIO); 9410 if (!refcount_inc_not_zero(&clp->cl_count)) 9411 goto out_err; 9412 9413 ret = ERR_PTR(-ENOMEM); 9414 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9415 if (calldata == NULL) 9416 goto out_put_clp; 9417 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9418 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9419 msg.rpc_argp = &calldata->args; 9420 msg.rpc_resp = &calldata->res; 9421 calldata->clp = clp; 9422 task_setup_data.callback_data = calldata; 9423 9424 ret = rpc_run_task(&task_setup_data); 9425 if (IS_ERR(ret)) 9426 goto out_err; 9427 return ret; 9428 out_put_clp: 9429 nfs_put_client(clp); 9430 out_err: 9431 nfs41_release_slot(slot); 9432 return ret; 9433 } 9434 9435 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9436 { 9437 struct rpc_task *task; 9438 int ret = 0; 9439 9440 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9441 return -EAGAIN; 9442 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9443 if (IS_ERR(task)) 9444 ret = PTR_ERR(task); 9445 else 9446 rpc_put_task_async(task); 9447 dprintk("<-- %s status=%d\n", __func__, ret); 9448 return ret; 9449 } 9450 9451 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9452 { 9453 struct rpc_task *task; 9454 int ret; 9455 9456 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9457 if (IS_ERR(task)) { 9458 ret = PTR_ERR(task); 9459 goto out; 9460 } 9461 ret = rpc_wait_for_completion_task(task); 9462 if (!ret) 9463 ret = task->tk_status; 9464 rpc_put_task(task); 9465 out: 9466 dprintk("<-- %s status=%d\n", __func__, ret); 9467 return ret; 9468 } 9469 9470 struct nfs4_reclaim_complete_data { 9471 struct nfs_client *clp; 9472 struct nfs41_reclaim_complete_args arg; 9473 struct nfs41_reclaim_complete_res res; 9474 }; 9475 9476 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9477 { 9478 struct nfs4_reclaim_complete_data *calldata = data; 9479 9480 nfs4_setup_sequence(calldata->clp, 9481 &calldata->arg.seq_args, 9482 &calldata->res.seq_res, 9483 task); 9484 } 9485 9486 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9487 { 9488 switch(task->tk_status) { 9489 case 0: 9490 wake_up_all(&clp->cl_lock_waitq); 9491 fallthrough; 9492 case -NFS4ERR_COMPLETE_ALREADY: 9493 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9494 break; 9495 case -NFS4ERR_DELAY: 9496 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9497 fallthrough; 9498 case -NFS4ERR_RETRY_UNCACHED_REP: 9499 case -EACCES: 9500 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9501 __func__, task->tk_status, clp->cl_hostname); 9502 return -EAGAIN; 9503 case -NFS4ERR_BADSESSION: 9504 case -NFS4ERR_DEADSESSION: 9505 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9506 break; 9507 default: 9508 nfs4_schedule_lease_recovery(clp); 9509 } 9510 return 0; 9511 } 9512 9513 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9514 { 9515 struct nfs4_reclaim_complete_data *calldata = data; 9516 struct nfs_client *clp = calldata->clp; 9517 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9518 9519 if (!nfs41_sequence_done(task, res)) 9520 return; 9521 9522 trace_nfs4_reclaim_complete(clp, task->tk_status); 9523 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9524 rpc_restart_call_prepare(task); 9525 return; 9526 } 9527 } 9528 9529 static void nfs4_free_reclaim_complete_data(void *data) 9530 { 9531 struct nfs4_reclaim_complete_data *calldata = data; 9532 9533 kfree(calldata); 9534 } 9535 9536 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9537 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9538 .rpc_call_done = nfs4_reclaim_complete_done, 9539 .rpc_release = nfs4_free_reclaim_complete_data, 9540 }; 9541 9542 /* 9543 * Issue a global reclaim complete. 9544 */ 9545 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9546 const struct cred *cred) 9547 { 9548 struct nfs4_reclaim_complete_data *calldata; 9549 struct rpc_message msg = { 9550 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9551 .rpc_cred = cred, 9552 }; 9553 struct rpc_task_setup task_setup_data = { 9554 .rpc_client = clp->cl_rpcclient, 9555 .rpc_message = &msg, 9556 .callback_ops = &nfs4_reclaim_complete_call_ops, 9557 .flags = RPC_TASK_NO_ROUND_ROBIN, 9558 }; 9559 int status = -ENOMEM; 9560 9561 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9562 if (calldata == NULL) 9563 goto out; 9564 calldata->clp = clp; 9565 calldata->arg.one_fs = 0; 9566 9567 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9568 msg.rpc_argp = &calldata->arg; 9569 msg.rpc_resp = &calldata->res; 9570 task_setup_data.callback_data = calldata; 9571 status = nfs4_call_sync_custom(&task_setup_data); 9572 out: 9573 dprintk("<-- %s status=%d\n", __func__, status); 9574 return status; 9575 } 9576 9577 static void 9578 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9579 { 9580 struct nfs4_layoutget *lgp = calldata; 9581 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9582 9583 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9584 &lgp->res.seq_res, task); 9585 } 9586 9587 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9588 { 9589 struct nfs4_layoutget *lgp = calldata; 9590 9591 nfs41_sequence_process(task, &lgp->res.seq_res); 9592 } 9593 9594 static int 9595 nfs4_layoutget_handle_exception(struct rpc_task *task, 9596 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9597 { 9598 struct inode *inode = lgp->args.inode; 9599 struct nfs_server *server = NFS_SERVER(inode); 9600 struct pnfs_layout_hdr *lo = lgp->lo; 9601 int nfs4err = task->tk_status; 9602 int err, status = 0; 9603 LIST_HEAD(head); 9604 9605 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9606 9607 nfs4_sequence_free_slot(&lgp->res.seq_res); 9608 9609 switch (nfs4err) { 9610 case 0: 9611 goto out; 9612 9613 /* 9614 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9615 * on the file. set tk_status to -ENODATA to tell upper layer to 9616 * retry go inband. 9617 */ 9618 case -NFS4ERR_LAYOUTUNAVAILABLE: 9619 status = -ENODATA; 9620 goto out; 9621 /* 9622 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9623 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9624 */ 9625 case -NFS4ERR_BADLAYOUT: 9626 status = -EOVERFLOW; 9627 goto out; 9628 /* 9629 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9630 * (or clients) writing to the same RAID stripe except when 9631 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9632 * 9633 * Treat it like we would RECALLCONFLICT -- we retry for a little 9634 * while, and then eventually give up. 9635 */ 9636 case -NFS4ERR_LAYOUTTRYLATER: 9637 if (lgp->args.minlength == 0) { 9638 status = -EOVERFLOW; 9639 goto out; 9640 } 9641 status = -EBUSY; 9642 break; 9643 case -NFS4ERR_RECALLCONFLICT: 9644 status = -ERECALLCONFLICT; 9645 break; 9646 case -NFS4ERR_DELEG_REVOKED: 9647 case -NFS4ERR_ADMIN_REVOKED: 9648 case -NFS4ERR_EXPIRED: 9649 case -NFS4ERR_BAD_STATEID: 9650 exception->timeout = 0; 9651 spin_lock(&inode->i_lock); 9652 /* If the open stateid was bad, then recover it. */ 9653 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9654 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9655 spin_unlock(&inode->i_lock); 9656 exception->state = lgp->args.ctx->state; 9657 exception->stateid = &lgp->args.stateid; 9658 break; 9659 } 9660 9661 /* 9662 * Mark the bad layout state as invalid, then retry 9663 */ 9664 pnfs_mark_layout_stateid_invalid(lo, &head); 9665 spin_unlock(&inode->i_lock); 9666 nfs_commit_inode(inode, 0); 9667 pnfs_free_lseg_list(&head); 9668 status = -EAGAIN; 9669 goto out; 9670 } 9671 9672 err = nfs4_handle_exception(server, nfs4err, exception); 9673 if (!status) { 9674 if (exception->retry) 9675 status = -EAGAIN; 9676 else 9677 status = err; 9678 } 9679 out: 9680 return status; 9681 } 9682 9683 size_t max_response_pages(struct nfs_server *server) 9684 { 9685 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9686 return nfs_page_array_len(0, max_resp_sz); 9687 } 9688 9689 static void nfs4_layoutget_release(void *calldata) 9690 { 9691 struct nfs4_layoutget *lgp = calldata; 9692 9693 nfs4_sequence_free_slot(&lgp->res.seq_res); 9694 pnfs_layoutget_free(lgp); 9695 } 9696 9697 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9698 .rpc_call_prepare = nfs4_layoutget_prepare, 9699 .rpc_call_done = nfs4_layoutget_done, 9700 .rpc_release = nfs4_layoutget_release, 9701 }; 9702 9703 struct pnfs_layout_segment * 9704 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9705 { 9706 struct inode *inode = lgp->args.inode; 9707 struct nfs_server *server = NFS_SERVER(inode); 9708 struct rpc_task *task; 9709 struct rpc_message msg = { 9710 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9711 .rpc_argp = &lgp->args, 9712 .rpc_resp = &lgp->res, 9713 .rpc_cred = lgp->cred, 9714 }; 9715 struct rpc_task_setup task_setup_data = { 9716 .rpc_client = server->client, 9717 .rpc_message = &msg, 9718 .callback_ops = &nfs4_layoutget_call_ops, 9719 .callback_data = lgp, 9720 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9721 RPC_TASK_MOVEABLE, 9722 }; 9723 struct pnfs_layout_segment *lseg = NULL; 9724 struct nfs4_exception exception = { 9725 .inode = inode, 9726 .timeout = *timeout, 9727 }; 9728 int status = 0; 9729 9730 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9731 9732 task = rpc_run_task(&task_setup_data); 9733 if (IS_ERR(task)) 9734 return ERR_CAST(task); 9735 9736 status = rpc_wait_for_completion_task(task); 9737 if (status != 0) 9738 goto out; 9739 9740 if (task->tk_status < 0) { 9741 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9742 *timeout = exception.timeout; 9743 } else if (lgp->res.layoutp->len == 0) { 9744 status = -EAGAIN; 9745 *timeout = nfs4_update_delay(&exception.timeout); 9746 } else 9747 lseg = pnfs_layout_process(lgp); 9748 out: 9749 trace_nfs4_layoutget(lgp->args.ctx, 9750 &lgp->args.range, 9751 &lgp->res.range, 9752 &lgp->res.stateid, 9753 status); 9754 9755 rpc_put_task(task); 9756 dprintk("<-- %s status=%d\n", __func__, status); 9757 if (status) 9758 return ERR_PTR(status); 9759 return lseg; 9760 } 9761 9762 static void 9763 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9764 { 9765 struct nfs4_layoutreturn *lrp = calldata; 9766 9767 nfs4_setup_sequence(lrp->clp, 9768 &lrp->args.seq_args, 9769 &lrp->res.seq_res, 9770 task); 9771 if (!pnfs_layout_is_valid(lrp->args.layout)) 9772 rpc_exit(task, 0); 9773 } 9774 9775 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9776 { 9777 struct nfs4_layoutreturn *lrp = calldata; 9778 struct nfs_server *server; 9779 9780 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9781 return; 9782 9783 /* 9784 * Was there an RPC level error? Assume the call succeeded, 9785 * and that we need to release the layout 9786 */ 9787 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9788 lrp->res.lrs_present = 0; 9789 return; 9790 } 9791 9792 server = NFS_SERVER(lrp->args.inode); 9793 switch (task->tk_status) { 9794 case -NFS4ERR_OLD_STATEID: 9795 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9796 &lrp->args.range, 9797 lrp->args.inode)) 9798 goto out_restart; 9799 fallthrough; 9800 default: 9801 task->tk_status = 0; 9802 fallthrough; 9803 case 0: 9804 break; 9805 case -NFS4ERR_DELAY: 9806 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9807 break; 9808 goto out_restart; 9809 } 9810 return; 9811 out_restart: 9812 task->tk_status = 0; 9813 nfs4_sequence_free_slot(&lrp->res.seq_res); 9814 rpc_restart_call_prepare(task); 9815 } 9816 9817 static void nfs4_layoutreturn_release(void *calldata) 9818 { 9819 struct nfs4_layoutreturn *lrp = calldata; 9820 struct pnfs_layout_hdr *lo = lrp->args.layout; 9821 9822 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9823 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9824 nfs4_sequence_free_slot(&lrp->res.seq_res); 9825 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9826 lrp->ld_private.ops->free(&lrp->ld_private); 9827 pnfs_put_layout_hdr(lrp->args.layout); 9828 nfs_iput_and_deactive(lrp->inode); 9829 put_cred(lrp->cred); 9830 kfree(calldata); 9831 } 9832 9833 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9834 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9835 .rpc_call_done = nfs4_layoutreturn_done, 9836 .rpc_release = nfs4_layoutreturn_release, 9837 }; 9838 9839 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9840 { 9841 struct rpc_task *task; 9842 struct rpc_message msg = { 9843 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9844 .rpc_argp = &lrp->args, 9845 .rpc_resp = &lrp->res, 9846 .rpc_cred = lrp->cred, 9847 }; 9848 struct rpc_task_setup task_setup_data = { 9849 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9850 .rpc_message = &msg, 9851 .callback_ops = &nfs4_layoutreturn_call_ops, 9852 .callback_data = lrp, 9853 .flags = RPC_TASK_MOVEABLE, 9854 }; 9855 int status = 0; 9856 9857 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9858 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9859 &task_setup_data.rpc_client, &msg); 9860 9861 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9862 if (!sync) { 9863 if (!lrp->inode) { 9864 nfs4_layoutreturn_release(lrp); 9865 return -EAGAIN; 9866 } 9867 task_setup_data.flags |= RPC_TASK_ASYNC; 9868 } 9869 if (!lrp->inode) 9870 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9871 1); 9872 else 9873 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9874 0); 9875 task = rpc_run_task(&task_setup_data); 9876 if (IS_ERR(task)) 9877 return PTR_ERR(task); 9878 if (sync) 9879 status = task->tk_status; 9880 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9881 dprintk("<-- %s status=%d\n", __func__, status); 9882 rpc_put_task(task); 9883 return status; 9884 } 9885 9886 static int 9887 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9888 struct pnfs_device *pdev, 9889 const struct cred *cred) 9890 { 9891 struct nfs4_getdeviceinfo_args args = { 9892 .pdev = pdev, 9893 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9894 NOTIFY_DEVICEID4_DELETE, 9895 }; 9896 struct nfs4_getdeviceinfo_res res = { 9897 .pdev = pdev, 9898 }; 9899 struct rpc_message msg = { 9900 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9901 .rpc_argp = &args, 9902 .rpc_resp = &res, 9903 .rpc_cred = cred, 9904 }; 9905 int status; 9906 9907 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9908 if (res.notification & ~args.notify_types) 9909 dprintk("%s: unsupported notification\n", __func__); 9910 if (res.notification != args.notify_types) 9911 pdev->nocache = 1; 9912 9913 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9914 9915 dprintk("<-- %s status=%d\n", __func__, status); 9916 9917 return status; 9918 } 9919 9920 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9921 struct pnfs_device *pdev, 9922 const struct cred *cred) 9923 { 9924 struct nfs4_exception exception = { }; 9925 int err; 9926 9927 do { 9928 err = nfs4_handle_exception(server, 9929 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9930 &exception); 9931 } while (exception.retry); 9932 return err; 9933 } 9934 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9935 9936 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9937 { 9938 struct nfs4_layoutcommit_data *data = calldata; 9939 struct nfs_server *server = NFS_SERVER(data->args.inode); 9940 9941 nfs4_setup_sequence(server->nfs_client, 9942 &data->args.seq_args, 9943 &data->res.seq_res, 9944 task); 9945 } 9946 9947 static void 9948 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9949 { 9950 struct nfs4_layoutcommit_data *data = calldata; 9951 struct nfs_server *server = NFS_SERVER(data->args.inode); 9952 9953 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9954 return; 9955 9956 switch (task->tk_status) { /* Just ignore these failures */ 9957 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9958 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9959 case -NFS4ERR_BADLAYOUT: /* no layout */ 9960 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9961 task->tk_status = 0; 9962 break; 9963 case 0: 9964 break; 9965 default: 9966 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9967 rpc_restart_call_prepare(task); 9968 return; 9969 } 9970 } 9971 } 9972 9973 static void nfs4_layoutcommit_release(void *calldata) 9974 { 9975 struct nfs4_layoutcommit_data *data = calldata; 9976 9977 pnfs_cleanup_layoutcommit(data); 9978 nfs_post_op_update_inode_force_wcc(data->args.inode, 9979 data->res.fattr); 9980 put_cred(data->cred); 9981 nfs_iput_and_deactive(data->inode); 9982 kfree(data); 9983 } 9984 9985 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9986 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9987 .rpc_call_done = nfs4_layoutcommit_done, 9988 .rpc_release = nfs4_layoutcommit_release, 9989 }; 9990 9991 int 9992 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9993 { 9994 struct rpc_message msg = { 9995 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9996 .rpc_argp = &data->args, 9997 .rpc_resp = &data->res, 9998 .rpc_cred = data->cred, 9999 }; 10000 struct rpc_task_setup task_setup_data = { 10001 .task = &data->task, 10002 .rpc_client = NFS_CLIENT(data->args.inode), 10003 .rpc_message = &msg, 10004 .callback_ops = &nfs4_layoutcommit_ops, 10005 .callback_data = data, 10006 .flags = RPC_TASK_MOVEABLE, 10007 }; 10008 struct rpc_task *task; 10009 int status = 0; 10010 10011 dprintk("NFS: initiating layoutcommit call. sync %d " 10012 "lbw: %llu inode %lu\n", sync, 10013 data->args.lastbytewritten, 10014 data->args.inode->i_ino); 10015 10016 if (!sync) { 10017 data->inode = nfs_igrab_and_active(data->args.inode); 10018 if (data->inode == NULL) { 10019 nfs4_layoutcommit_release(data); 10020 return -EAGAIN; 10021 } 10022 task_setup_data.flags = RPC_TASK_ASYNC; 10023 } 10024 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10025 task = rpc_run_task(&task_setup_data); 10026 if (IS_ERR(task)) 10027 return PTR_ERR(task); 10028 if (sync) 10029 status = task->tk_status; 10030 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10031 dprintk("%s: status %d\n", __func__, status); 10032 rpc_put_task(task); 10033 return status; 10034 } 10035 10036 /* 10037 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10038 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10039 */ 10040 static int 10041 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10042 struct nfs_fsinfo *info, 10043 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10044 { 10045 struct nfs41_secinfo_no_name_args args = { 10046 .style = SECINFO_STYLE_CURRENT_FH, 10047 }; 10048 struct nfs4_secinfo_res res = { 10049 .flavors = flavors, 10050 }; 10051 struct rpc_message msg = { 10052 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10053 .rpc_argp = &args, 10054 .rpc_resp = &res, 10055 }; 10056 struct nfs4_call_sync_data data = { 10057 .seq_server = server, 10058 .seq_args = &args.seq_args, 10059 .seq_res = &res.seq_res, 10060 }; 10061 struct rpc_task_setup task_setup = { 10062 .rpc_client = server->client, 10063 .rpc_message = &msg, 10064 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10065 .callback_data = &data, 10066 .flags = RPC_TASK_NO_ROUND_ROBIN, 10067 }; 10068 const struct cred *cred = NULL; 10069 int status; 10070 10071 if (use_integrity) { 10072 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10073 10074 cred = nfs4_get_clid_cred(server->nfs_client); 10075 msg.rpc_cred = cred; 10076 } 10077 10078 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10079 status = nfs4_call_sync_custom(&task_setup); 10080 dprintk("<-- %s status=%d\n", __func__, status); 10081 10082 put_cred(cred); 10083 10084 return status; 10085 } 10086 10087 static int 10088 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10089 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10090 { 10091 struct nfs4_exception exception = { 10092 .interruptible = true, 10093 }; 10094 int err; 10095 do { 10096 /* first try using integrity protection */ 10097 err = -NFS4ERR_WRONGSEC; 10098 10099 /* try to use integrity protection with machine cred */ 10100 if (_nfs4_is_integrity_protected(server->nfs_client)) 10101 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10102 flavors, true); 10103 10104 /* 10105 * if unable to use integrity protection, or SECINFO with 10106 * integrity protection returns NFS4ERR_WRONGSEC (which is 10107 * disallowed by spec, but exists in deployed servers) use 10108 * the current filesystem's rpc_client and the user cred. 10109 */ 10110 if (err == -NFS4ERR_WRONGSEC) 10111 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10112 flavors, false); 10113 10114 switch (err) { 10115 case 0: 10116 case -NFS4ERR_WRONGSEC: 10117 case -ENOTSUPP: 10118 goto out; 10119 default: 10120 err = nfs4_handle_exception(server, err, &exception); 10121 } 10122 } while (exception.retry); 10123 out: 10124 return err; 10125 } 10126 10127 static int 10128 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10129 struct nfs_fsinfo *info) 10130 { 10131 int err; 10132 struct page *page; 10133 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10134 struct nfs4_secinfo_flavors *flavors; 10135 struct nfs4_secinfo4 *secinfo; 10136 int i; 10137 10138 page = alloc_page(GFP_KERNEL); 10139 if (!page) { 10140 err = -ENOMEM; 10141 goto out; 10142 } 10143 10144 flavors = page_address(page); 10145 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10146 10147 /* 10148 * Fall back on "guess and check" method if 10149 * the server doesn't support SECINFO_NO_NAME 10150 */ 10151 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10152 err = nfs4_find_root_sec(server, fhandle, info); 10153 goto out_freepage; 10154 } 10155 if (err) 10156 goto out_freepage; 10157 10158 for (i = 0; i < flavors->num_flavors; i++) { 10159 secinfo = &flavors->flavors[i]; 10160 10161 switch (secinfo->flavor) { 10162 case RPC_AUTH_NULL: 10163 case RPC_AUTH_UNIX: 10164 case RPC_AUTH_GSS: 10165 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10166 &secinfo->flavor_info); 10167 break; 10168 default: 10169 flavor = RPC_AUTH_MAXFLAVOR; 10170 break; 10171 } 10172 10173 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10174 flavor = RPC_AUTH_MAXFLAVOR; 10175 10176 if (flavor != RPC_AUTH_MAXFLAVOR) { 10177 err = nfs4_lookup_root_sec(server, fhandle, 10178 info, flavor); 10179 if (!err) 10180 break; 10181 } 10182 } 10183 10184 if (flavor == RPC_AUTH_MAXFLAVOR) 10185 err = -EPERM; 10186 10187 out_freepage: 10188 put_page(page); 10189 if (err == -EACCES) 10190 return -EPERM; 10191 out: 10192 return err; 10193 } 10194 10195 static int _nfs41_test_stateid(struct nfs_server *server, 10196 nfs4_stateid *stateid, 10197 const struct cred *cred) 10198 { 10199 int status; 10200 struct nfs41_test_stateid_args args = { 10201 .stateid = stateid, 10202 }; 10203 struct nfs41_test_stateid_res res; 10204 struct rpc_message msg = { 10205 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10206 .rpc_argp = &args, 10207 .rpc_resp = &res, 10208 .rpc_cred = cred, 10209 }; 10210 struct rpc_clnt *rpc_client = server->client; 10211 10212 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10213 &rpc_client, &msg); 10214 10215 dprintk("NFS call test_stateid %p\n", stateid); 10216 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10217 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10218 &args.seq_args, &res.seq_res); 10219 if (status != NFS_OK) { 10220 dprintk("NFS reply test_stateid: failed, %d\n", status); 10221 return status; 10222 } 10223 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10224 return -res.status; 10225 } 10226 10227 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10228 int err, struct nfs4_exception *exception) 10229 { 10230 exception->retry = 0; 10231 switch(err) { 10232 case -NFS4ERR_DELAY: 10233 case -NFS4ERR_RETRY_UNCACHED_REP: 10234 nfs4_handle_exception(server, err, exception); 10235 break; 10236 case -NFS4ERR_BADSESSION: 10237 case -NFS4ERR_BADSLOT: 10238 case -NFS4ERR_BAD_HIGH_SLOT: 10239 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10240 case -NFS4ERR_DEADSESSION: 10241 nfs4_do_handle_exception(server, err, exception); 10242 } 10243 } 10244 10245 /** 10246 * nfs41_test_stateid - perform a TEST_STATEID operation 10247 * 10248 * @server: server / transport on which to perform the operation 10249 * @stateid: state ID to test 10250 * @cred: credential 10251 * 10252 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10253 * Otherwise a negative NFS4ERR value is returned if the operation 10254 * failed or the state ID is not currently valid. 10255 */ 10256 static int nfs41_test_stateid(struct nfs_server *server, 10257 nfs4_stateid *stateid, 10258 const struct cred *cred) 10259 { 10260 struct nfs4_exception exception = { 10261 .interruptible = true, 10262 }; 10263 int err; 10264 do { 10265 err = _nfs41_test_stateid(server, stateid, cred); 10266 nfs4_handle_delay_or_session_error(server, err, &exception); 10267 } while (exception.retry); 10268 return err; 10269 } 10270 10271 struct nfs_free_stateid_data { 10272 struct nfs_server *server; 10273 struct nfs41_free_stateid_args args; 10274 struct nfs41_free_stateid_res res; 10275 }; 10276 10277 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10278 { 10279 struct nfs_free_stateid_data *data = calldata; 10280 nfs4_setup_sequence(data->server->nfs_client, 10281 &data->args.seq_args, 10282 &data->res.seq_res, 10283 task); 10284 } 10285 10286 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10287 { 10288 struct nfs_free_stateid_data *data = calldata; 10289 10290 nfs41_sequence_done(task, &data->res.seq_res); 10291 10292 switch (task->tk_status) { 10293 case -NFS4ERR_DELAY: 10294 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10295 rpc_restart_call_prepare(task); 10296 } 10297 } 10298 10299 static void nfs41_free_stateid_release(void *calldata) 10300 { 10301 struct nfs_free_stateid_data *data = calldata; 10302 struct nfs_client *clp = data->server->nfs_client; 10303 10304 nfs_put_client(clp); 10305 kfree(calldata); 10306 } 10307 10308 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10309 .rpc_call_prepare = nfs41_free_stateid_prepare, 10310 .rpc_call_done = nfs41_free_stateid_done, 10311 .rpc_release = nfs41_free_stateid_release, 10312 }; 10313 10314 /** 10315 * nfs41_free_stateid - perform a FREE_STATEID operation 10316 * 10317 * @server: server / transport on which to perform the operation 10318 * @stateid: state ID to release 10319 * @cred: credential 10320 * @privileged: set to true if this call needs to be privileged 10321 * 10322 * Note: this function is always asynchronous. 10323 */ 10324 static int nfs41_free_stateid(struct nfs_server *server, 10325 const nfs4_stateid *stateid, 10326 const struct cred *cred, 10327 bool privileged) 10328 { 10329 struct rpc_message msg = { 10330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10331 .rpc_cred = cred, 10332 }; 10333 struct rpc_task_setup task_setup = { 10334 .rpc_client = server->client, 10335 .rpc_message = &msg, 10336 .callback_ops = &nfs41_free_stateid_ops, 10337 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10338 }; 10339 struct nfs_free_stateid_data *data; 10340 struct rpc_task *task; 10341 struct nfs_client *clp = server->nfs_client; 10342 10343 if (!refcount_inc_not_zero(&clp->cl_count)) 10344 return -EIO; 10345 10346 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10347 &task_setup.rpc_client, &msg); 10348 10349 dprintk("NFS call free_stateid %p\n", stateid); 10350 data = kmalloc(sizeof(*data), GFP_KERNEL); 10351 if (!data) 10352 return -ENOMEM; 10353 data->server = server; 10354 nfs4_stateid_copy(&data->args.stateid, stateid); 10355 10356 task_setup.callback_data = data; 10357 10358 msg.rpc_argp = &data->args; 10359 msg.rpc_resp = &data->res; 10360 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10361 task = rpc_run_task(&task_setup); 10362 if (IS_ERR(task)) 10363 return PTR_ERR(task); 10364 rpc_put_task(task); 10365 return 0; 10366 } 10367 10368 static void 10369 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10370 { 10371 const struct cred *cred = lsp->ls_state->owner->so_cred; 10372 10373 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10374 nfs4_free_lock_state(server, lsp); 10375 } 10376 10377 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10378 const nfs4_stateid *s2) 10379 { 10380 if (s1->type != s2->type) 10381 return false; 10382 10383 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10384 return false; 10385 10386 if (s1->seqid == s2->seqid) 10387 return true; 10388 10389 return s1->seqid == 0 || s2->seqid == 0; 10390 } 10391 10392 #endif /* CONFIG_NFS_V4_1 */ 10393 10394 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10395 const nfs4_stateid *s2) 10396 { 10397 return nfs4_stateid_match(s1, s2); 10398 } 10399 10400 10401 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10402 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10403 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10404 .recover_open = nfs4_open_reclaim, 10405 .recover_lock = nfs4_lock_reclaim, 10406 .establish_clid = nfs4_init_clientid, 10407 .detect_trunking = nfs40_discover_server_trunking, 10408 }; 10409 10410 #if defined(CONFIG_NFS_V4_1) 10411 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10412 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10413 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10414 .recover_open = nfs4_open_reclaim, 10415 .recover_lock = nfs4_lock_reclaim, 10416 .establish_clid = nfs41_init_clientid, 10417 .reclaim_complete = nfs41_proc_reclaim_complete, 10418 .detect_trunking = nfs41_discover_server_trunking, 10419 }; 10420 #endif /* CONFIG_NFS_V4_1 */ 10421 10422 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10423 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10424 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10425 .recover_open = nfs40_open_expired, 10426 .recover_lock = nfs4_lock_expired, 10427 .establish_clid = nfs4_init_clientid, 10428 }; 10429 10430 #if defined(CONFIG_NFS_V4_1) 10431 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10432 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10433 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10434 .recover_open = nfs41_open_expired, 10435 .recover_lock = nfs41_lock_expired, 10436 .establish_clid = nfs41_init_clientid, 10437 }; 10438 #endif /* CONFIG_NFS_V4_1 */ 10439 10440 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10441 .sched_state_renewal = nfs4_proc_async_renew, 10442 .get_state_renewal_cred = nfs4_get_renew_cred, 10443 .renew_lease = nfs4_proc_renew, 10444 }; 10445 10446 #if defined(CONFIG_NFS_V4_1) 10447 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10448 .sched_state_renewal = nfs41_proc_async_sequence, 10449 .get_state_renewal_cred = nfs4_get_machine_cred, 10450 .renew_lease = nfs4_proc_sequence, 10451 }; 10452 #endif 10453 10454 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10455 .get_locations = _nfs40_proc_get_locations, 10456 .fsid_present = _nfs40_proc_fsid_present, 10457 }; 10458 10459 #if defined(CONFIG_NFS_V4_1) 10460 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10461 .get_locations = _nfs41_proc_get_locations, 10462 .fsid_present = _nfs41_proc_fsid_present, 10463 }; 10464 #endif /* CONFIG_NFS_V4_1 */ 10465 10466 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10467 .minor_version = 0, 10468 .init_caps = NFS_CAP_READDIRPLUS 10469 | NFS_CAP_ATOMIC_OPEN 10470 | NFS_CAP_POSIX_LOCK, 10471 .init_client = nfs40_init_client, 10472 .shutdown_client = nfs40_shutdown_client, 10473 .match_stateid = nfs4_match_stateid, 10474 .find_root_sec = nfs4_find_root_sec, 10475 .free_lock_state = nfs4_release_lockowner, 10476 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10477 .alloc_seqid = nfs_alloc_seqid, 10478 .call_sync_ops = &nfs40_call_sync_ops, 10479 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10480 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10481 .state_renewal_ops = &nfs40_state_renewal_ops, 10482 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10483 }; 10484 10485 #if defined(CONFIG_NFS_V4_1) 10486 static struct nfs_seqid * 10487 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10488 { 10489 return NULL; 10490 } 10491 10492 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10493 .minor_version = 1, 10494 .init_caps = NFS_CAP_READDIRPLUS 10495 | NFS_CAP_ATOMIC_OPEN 10496 | NFS_CAP_POSIX_LOCK 10497 | NFS_CAP_STATEID_NFSV41 10498 | NFS_CAP_ATOMIC_OPEN_V1 10499 | NFS_CAP_LGOPEN 10500 | NFS_CAP_MOVEABLE, 10501 .init_client = nfs41_init_client, 10502 .shutdown_client = nfs41_shutdown_client, 10503 .match_stateid = nfs41_match_stateid, 10504 .find_root_sec = nfs41_find_root_sec, 10505 .free_lock_state = nfs41_free_lock_state, 10506 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10507 .alloc_seqid = nfs_alloc_no_seqid, 10508 .session_trunk = nfs4_test_session_trunk, 10509 .call_sync_ops = &nfs41_call_sync_ops, 10510 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10511 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10512 .state_renewal_ops = &nfs41_state_renewal_ops, 10513 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10514 }; 10515 #endif 10516 10517 #if defined(CONFIG_NFS_V4_2) 10518 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10519 .minor_version = 2, 10520 .init_caps = NFS_CAP_READDIRPLUS 10521 | NFS_CAP_ATOMIC_OPEN 10522 | NFS_CAP_POSIX_LOCK 10523 | NFS_CAP_STATEID_NFSV41 10524 | NFS_CAP_ATOMIC_OPEN_V1 10525 | NFS_CAP_LGOPEN 10526 | NFS_CAP_ALLOCATE 10527 | NFS_CAP_COPY 10528 | NFS_CAP_OFFLOAD_CANCEL 10529 | NFS_CAP_COPY_NOTIFY 10530 | NFS_CAP_DEALLOCATE 10531 | NFS_CAP_SEEK 10532 | NFS_CAP_LAYOUTSTATS 10533 | NFS_CAP_CLONE 10534 | NFS_CAP_LAYOUTERROR 10535 | NFS_CAP_READ_PLUS 10536 | NFS_CAP_MOVEABLE, 10537 .init_client = nfs41_init_client, 10538 .shutdown_client = nfs41_shutdown_client, 10539 .match_stateid = nfs41_match_stateid, 10540 .find_root_sec = nfs41_find_root_sec, 10541 .free_lock_state = nfs41_free_lock_state, 10542 .call_sync_ops = &nfs41_call_sync_ops, 10543 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10544 .alloc_seqid = nfs_alloc_no_seqid, 10545 .session_trunk = nfs4_test_session_trunk, 10546 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10547 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10548 .state_renewal_ops = &nfs41_state_renewal_ops, 10549 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10550 }; 10551 #endif 10552 10553 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10554 [0] = &nfs_v4_0_minor_ops, 10555 #if defined(CONFIG_NFS_V4_1) 10556 [1] = &nfs_v4_1_minor_ops, 10557 #endif 10558 #if defined(CONFIG_NFS_V4_2) 10559 [2] = &nfs_v4_2_minor_ops, 10560 #endif 10561 }; 10562 10563 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10564 { 10565 ssize_t error, error2, error3; 10566 10567 error = generic_listxattr(dentry, list, size); 10568 if (error < 0) 10569 return error; 10570 if (list) { 10571 list += error; 10572 size -= error; 10573 } 10574 10575 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10576 if (error2 < 0) 10577 return error2; 10578 10579 if (list) { 10580 list += error2; 10581 size -= error2; 10582 } 10583 10584 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10585 if (error3 < 0) 10586 return error3; 10587 10588 return error + error2 + error3; 10589 } 10590 10591 static void nfs4_enable_swap(struct inode *inode) 10592 { 10593 /* The state manager thread must always be running. 10594 * It will notice the client is a swapper, and stay put. 10595 */ 10596 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10597 10598 nfs4_schedule_state_manager(clp); 10599 } 10600 10601 static void nfs4_disable_swap(struct inode *inode) 10602 { 10603 /* The state manager thread will now exit once it is 10604 * woken. 10605 */ 10606 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10607 10608 nfs4_schedule_state_manager(clp); 10609 } 10610 10611 static const struct inode_operations nfs4_dir_inode_operations = { 10612 .create = nfs_create, 10613 .lookup = nfs_lookup, 10614 .atomic_open = nfs_atomic_open, 10615 .link = nfs_link, 10616 .unlink = nfs_unlink, 10617 .symlink = nfs_symlink, 10618 .mkdir = nfs_mkdir, 10619 .rmdir = nfs_rmdir, 10620 .mknod = nfs_mknod, 10621 .rename = nfs_rename, 10622 .permission = nfs_permission, 10623 .getattr = nfs_getattr, 10624 .setattr = nfs_setattr, 10625 .listxattr = nfs4_listxattr, 10626 }; 10627 10628 static const struct inode_operations nfs4_file_inode_operations = { 10629 .permission = nfs_permission, 10630 .getattr = nfs_getattr, 10631 .setattr = nfs_setattr, 10632 .listxattr = nfs4_listxattr, 10633 }; 10634 10635 const struct nfs_rpc_ops nfs_v4_clientops = { 10636 .version = 4, /* protocol version */ 10637 .dentry_ops = &nfs4_dentry_operations, 10638 .dir_inode_ops = &nfs4_dir_inode_operations, 10639 .file_inode_ops = &nfs4_file_inode_operations, 10640 .file_ops = &nfs4_file_operations, 10641 .getroot = nfs4_proc_get_root, 10642 .submount = nfs4_submount, 10643 .try_get_tree = nfs4_try_get_tree, 10644 .getattr = nfs4_proc_getattr, 10645 .setattr = nfs4_proc_setattr, 10646 .lookup = nfs4_proc_lookup, 10647 .lookupp = nfs4_proc_lookupp, 10648 .access = nfs4_proc_access, 10649 .readlink = nfs4_proc_readlink, 10650 .create = nfs4_proc_create, 10651 .remove = nfs4_proc_remove, 10652 .unlink_setup = nfs4_proc_unlink_setup, 10653 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10654 .unlink_done = nfs4_proc_unlink_done, 10655 .rename_setup = nfs4_proc_rename_setup, 10656 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10657 .rename_done = nfs4_proc_rename_done, 10658 .link = nfs4_proc_link, 10659 .symlink = nfs4_proc_symlink, 10660 .mkdir = nfs4_proc_mkdir, 10661 .rmdir = nfs4_proc_rmdir, 10662 .readdir = nfs4_proc_readdir, 10663 .mknod = nfs4_proc_mknod, 10664 .statfs = nfs4_proc_statfs, 10665 .fsinfo = nfs4_proc_fsinfo, 10666 .pathconf = nfs4_proc_pathconf, 10667 .set_capabilities = nfs4_server_capabilities, 10668 .decode_dirent = nfs4_decode_dirent, 10669 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10670 .read_setup = nfs4_proc_read_setup, 10671 .read_done = nfs4_read_done, 10672 .write_setup = nfs4_proc_write_setup, 10673 .write_done = nfs4_write_done, 10674 .commit_setup = nfs4_proc_commit_setup, 10675 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10676 .commit_done = nfs4_commit_done, 10677 .lock = nfs4_proc_lock, 10678 .clear_acl_cache = nfs4_zap_acl_attr, 10679 .close_context = nfs4_close_context, 10680 .open_context = nfs4_atomic_open, 10681 .have_delegation = nfs4_have_delegation, 10682 .alloc_client = nfs4_alloc_client, 10683 .init_client = nfs4_init_client, 10684 .free_client = nfs4_free_client, 10685 .create_server = nfs4_create_server, 10686 .clone_server = nfs_clone_server, 10687 .discover_trunking = nfs4_discover_trunking, 10688 .enable_swap = nfs4_enable_swap, 10689 .disable_swap = nfs4_disable_swap, 10690 }; 10691 10692 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10693 .name = XATTR_NAME_NFSV4_ACL, 10694 .list = nfs4_xattr_list_nfs4_acl, 10695 .get = nfs4_xattr_get_nfs4_acl, 10696 .set = nfs4_xattr_set_nfs4_acl, 10697 }; 10698 10699 #if defined(CONFIG_NFS_V4_1) 10700 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10701 .name = XATTR_NAME_NFSV4_DACL, 10702 .list = nfs4_xattr_list_nfs4_dacl, 10703 .get = nfs4_xattr_get_nfs4_dacl, 10704 .set = nfs4_xattr_set_nfs4_dacl, 10705 }; 10706 10707 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10708 .name = XATTR_NAME_NFSV4_SACL, 10709 .list = nfs4_xattr_list_nfs4_sacl, 10710 .get = nfs4_xattr_get_nfs4_sacl, 10711 .set = nfs4_xattr_set_nfs4_sacl, 10712 }; 10713 #endif 10714 10715 #ifdef CONFIG_NFS_V4_2 10716 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10717 .prefix = XATTR_USER_PREFIX, 10718 .get = nfs4_xattr_get_nfs4_user, 10719 .set = nfs4_xattr_set_nfs4_user, 10720 }; 10721 #endif 10722 10723 const struct xattr_handler *nfs4_xattr_handlers[] = { 10724 &nfs4_xattr_nfs4_acl_handler, 10725 #if defined(CONFIG_NFS_V4_1) 10726 &nfs4_xattr_nfs4_dacl_handler, 10727 &nfs4_xattr_nfs4_sacl_handler, 10728 #endif 10729 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10730 &nfs4_xattr_nfs4_label_handler, 10731 #endif 10732 #ifdef CONFIG_NFS_V4_2 10733 &nfs4_xattr_nfs4_user_handler, 10734 #endif 10735 NULL 10736 }; 10737