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 err = security_dentry_init_security(dentry, sattr->ia_mode, 126 &dentry->d_name, NULL, 127 (void **)&label->label, &label->len); 128 if (err == 0) 129 return label; 130 131 return NULL; 132 } 133 static inline void 134 nfs4_label_release_security(struct nfs4_label *label) 135 { 136 if (label) 137 security_release_secctx(label->label, label->len); 138 } 139 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 140 { 141 if (label) 142 return server->attr_bitmask; 143 144 return server->attr_bitmask_nl; 145 } 146 #else 147 static inline struct nfs4_label * 148 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 149 struct iattr *sattr, struct nfs4_label *l) 150 { return NULL; } 151 static inline void 152 nfs4_label_release_security(struct nfs4_label *label) 153 { return; } 154 static inline u32 * 155 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 156 { return server->attr_bitmask; } 157 #endif 158 159 /* Prevent leaks of NFSv4 errors into userland */ 160 static int nfs4_map_errors(int err) 161 { 162 if (err >= -1000) 163 return err; 164 switch (err) { 165 case -NFS4ERR_RESOURCE: 166 case -NFS4ERR_LAYOUTTRYLATER: 167 case -NFS4ERR_RECALLCONFLICT: 168 return -EREMOTEIO; 169 case -NFS4ERR_WRONGSEC: 170 case -NFS4ERR_WRONG_CRED: 171 return -EPERM; 172 case -NFS4ERR_BADOWNER: 173 case -NFS4ERR_BADNAME: 174 return -EINVAL; 175 case -NFS4ERR_SHARE_DENIED: 176 return -EACCES; 177 case -NFS4ERR_MINOR_VERS_MISMATCH: 178 return -EPROTONOSUPPORT; 179 case -NFS4ERR_FILE_OPEN: 180 return -EBUSY; 181 case -NFS4ERR_NOT_SAME: 182 return -ENOTSYNC; 183 default: 184 dprintk("%s could not handle NFSv4 error %d\n", 185 __func__, -err); 186 break; 187 } 188 return -EIO; 189 } 190 191 /* 192 * This is our standard bitmap for GETATTR requests. 193 */ 194 const u32 nfs4_fattr_bitmap[3] = { 195 FATTR4_WORD0_TYPE 196 | FATTR4_WORD0_CHANGE 197 | FATTR4_WORD0_SIZE 198 | FATTR4_WORD0_FSID 199 | FATTR4_WORD0_FILEID, 200 FATTR4_WORD1_MODE 201 | FATTR4_WORD1_NUMLINKS 202 | FATTR4_WORD1_OWNER 203 | FATTR4_WORD1_OWNER_GROUP 204 | FATTR4_WORD1_RAWDEV 205 | FATTR4_WORD1_SPACE_USED 206 | FATTR4_WORD1_TIME_ACCESS 207 | FATTR4_WORD1_TIME_METADATA 208 | FATTR4_WORD1_TIME_MODIFY 209 | FATTR4_WORD1_MOUNTED_ON_FILEID, 210 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 211 FATTR4_WORD2_SECURITY_LABEL 212 #endif 213 }; 214 215 static const u32 nfs4_pnfs_open_bitmap[3] = { 216 FATTR4_WORD0_TYPE 217 | FATTR4_WORD0_CHANGE 218 | FATTR4_WORD0_SIZE 219 | FATTR4_WORD0_FSID 220 | FATTR4_WORD0_FILEID, 221 FATTR4_WORD1_MODE 222 | FATTR4_WORD1_NUMLINKS 223 | FATTR4_WORD1_OWNER 224 | FATTR4_WORD1_OWNER_GROUP 225 | FATTR4_WORD1_RAWDEV 226 | FATTR4_WORD1_SPACE_USED 227 | FATTR4_WORD1_TIME_ACCESS 228 | FATTR4_WORD1_TIME_METADATA 229 | FATTR4_WORD1_TIME_MODIFY, 230 FATTR4_WORD2_MDSTHRESHOLD 231 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 232 | FATTR4_WORD2_SECURITY_LABEL 233 #endif 234 }; 235 236 static const u32 nfs4_open_noattr_bitmap[3] = { 237 FATTR4_WORD0_TYPE 238 | FATTR4_WORD0_FILEID, 239 }; 240 241 const u32 nfs4_statfs_bitmap[3] = { 242 FATTR4_WORD0_FILES_AVAIL 243 | FATTR4_WORD0_FILES_FREE 244 | FATTR4_WORD0_FILES_TOTAL, 245 FATTR4_WORD1_SPACE_AVAIL 246 | FATTR4_WORD1_SPACE_FREE 247 | FATTR4_WORD1_SPACE_TOTAL 248 }; 249 250 const u32 nfs4_pathconf_bitmap[3] = { 251 FATTR4_WORD0_MAXLINK 252 | FATTR4_WORD0_MAXNAME, 253 0 254 }; 255 256 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 257 | FATTR4_WORD0_MAXREAD 258 | FATTR4_WORD0_MAXWRITE 259 | FATTR4_WORD0_LEASE_TIME, 260 FATTR4_WORD1_TIME_DELTA 261 | FATTR4_WORD1_FS_LAYOUT_TYPES, 262 FATTR4_WORD2_LAYOUT_BLKSIZE 263 | FATTR4_WORD2_CLONE_BLKSIZE 264 | FATTR4_WORD2_CHANGE_ATTR_TYPE 265 | FATTR4_WORD2_XATTR_SUPPORT 266 }; 267 268 const u32 nfs4_fs_locations_bitmap[3] = { 269 FATTR4_WORD0_CHANGE 270 | FATTR4_WORD0_SIZE 271 | FATTR4_WORD0_FSID 272 | FATTR4_WORD0_FILEID 273 | FATTR4_WORD0_FS_LOCATIONS, 274 FATTR4_WORD1_OWNER 275 | FATTR4_WORD1_OWNER_GROUP 276 | FATTR4_WORD1_RAWDEV 277 | FATTR4_WORD1_SPACE_USED 278 | FATTR4_WORD1_TIME_ACCESS 279 | FATTR4_WORD1_TIME_METADATA 280 | FATTR4_WORD1_TIME_MODIFY 281 | FATTR4_WORD1_MOUNTED_ON_FILEID, 282 }; 283 284 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 285 struct inode *inode, unsigned long flags) 286 { 287 unsigned long cache_validity; 288 289 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 290 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 291 return; 292 293 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 294 295 /* Remove the attributes over which we have full control */ 296 dst[1] &= ~FATTR4_WORD1_RAWDEV; 297 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 298 dst[0] &= ~FATTR4_WORD0_SIZE; 299 300 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 301 dst[0] &= ~FATTR4_WORD0_CHANGE; 302 303 if (!(cache_validity & NFS_INO_INVALID_MODE)) 304 dst[1] &= ~FATTR4_WORD1_MODE; 305 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 306 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 307 } 308 309 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 310 struct nfs4_readdir_arg *readdir) 311 { 312 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 313 __be32 *start, *p; 314 315 if (cookie > 2) { 316 readdir->cookie = cookie; 317 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 318 return; 319 } 320 321 readdir->cookie = 0; 322 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 323 if (cookie == 2) 324 return; 325 326 /* 327 * NFSv4 servers do not return entries for '.' and '..' 328 * Therefore, we fake these entries here. We let '.' 329 * have cookie 0 and '..' have cookie 1. Note that 330 * when talking to the server, we always send cookie 0 331 * instead of 1 or 2. 332 */ 333 start = p = kmap_atomic(*readdir->pages); 334 335 if (cookie == 0) { 336 *p++ = xdr_one; /* next */ 337 *p++ = xdr_zero; /* cookie, first word */ 338 *p++ = xdr_one; /* cookie, second word */ 339 *p++ = xdr_one; /* entry len */ 340 memcpy(p, ".\0\0\0", 4); /* entry */ 341 p++; 342 *p++ = xdr_one; /* bitmap length */ 343 *p++ = htonl(attrs); /* bitmap */ 344 *p++ = htonl(12); /* attribute buffer length */ 345 *p++ = htonl(NF4DIR); 346 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 347 } 348 349 *p++ = xdr_one; /* next */ 350 *p++ = xdr_zero; /* cookie, first word */ 351 *p++ = xdr_two; /* cookie, second word */ 352 *p++ = xdr_two; /* entry len */ 353 memcpy(p, "..\0\0", 4); /* entry */ 354 p++; 355 *p++ = xdr_one; /* bitmap length */ 356 *p++ = htonl(attrs); /* bitmap */ 357 *p++ = htonl(12); /* attribute buffer length */ 358 *p++ = htonl(NF4DIR); 359 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 360 361 readdir->pgbase = (char *)p - (char *)start; 362 readdir->count -= readdir->pgbase; 363 kunmap_atomic(start); 364 } 365 366 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 367 { 368 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 369 fattr->pre_change_attr = version; 370 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 371 } 372 } 373 374 static void nfs4_test_and_free_stateid(struct nfs_server *server, 375 nfs4_stateid *stateid, 376 const struct cred *cred) 377 { 378 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 379 380 ops->test_and_free_expired(server, stateid, cred); 381 } 382 383 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 384 nfs4_stateid *stateid, 385 const struct cred *cred) 386 { 387 stateid->type = NFS4_REVOKED_STATEID_TYPE; 388 nfs4_test_and_free_stateid(server, stateid, cred); 389 } 390 391 static void nfs4_free_revoked_stateid(struct nfs_server *server, 392 const nfs4_stateid *stateid, 393 const struct cred *cred) 394 { 395 nfs4_stateid tmp; 396 397 nfs4_stateid_copy(&tmp, stateid); 398 __nfs4_free_revoked_stateid(server, &tmp, cred); 399 } 400 401 static long nfs4_update_delay(long *timeout) 402 { 403 long ret; 404 if (!timeout) 405 return NFS4_POLL_RETRY_MAX; 406 if (*timeout <= 0) 407 *timeout = NFS4_POLL_RETRY_MIN; 408 if (*timeout > NFS4_POLL_RETRY_MAX) 409 *timeout = NFS4_POLL_RETRY_MAX; 410 ret = *timeout; 411 *timeout <<= 1; 412 return ret; 413 } 414 415 static int nfs4_delay_killable(long *timeout) 416 { 417 might_sleep(); 418 419 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 420 schedule_timeout(nfs4_update_delay(timeout)); 421 if (!__fatal_signal_pending(current)) 422 return 0; 423 return -EINTR; 424 } 425 426 static int nfs4_delay_interruptible(long *timeout) 427 { 428 might_sleep(); 429 430 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 431 schedule_timeout(nfs4_update_delay(timeout)); 432 if (!signal_pending(current)) 433 return 0; 434 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 435 } 436 437 static int nfs4_delay(long *timeout, bool interruptible) 438 { 439 if (interruptible) 440 return nfs4_delay_interruptible(timeout); 441 return nfs4_delay_killable(timeout); 442 } 443 444 static const nfs4_stateid * 445 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 446 { 447 if (!stateid) 448 return NULL; 449 switch (stateid->type) { 450 case NFS4_OPEN_STATEID_TYPE: 451 case NFS4_LOCK_STATEID_TYPE: 452 case NFS4_DELEGATION_STATEID_TYPE: 453 return stateid; 454 default: 455 break; 456 } 457 return NULL; 458 } 459 460 /* This is the error handling routine for processes that are allowed 461 * to sleep. 462 */ 463 static int nfs4_do_handle_exception(struct nfs_server *server, 464 int errorcode, struct nfs4_exception *exception) 465 { 466 struct nfs_client *clp = server->nfs_client; 467 struct nfs4_state *state = exception->state; 468 const nfs4_stateid *stateid; 469 struct inode *inode = exception->inode; 470 int ret = errorcode; 471 472 exception->delay = 0; 473 exception->recovering = 0; 474 exception->retry = 0; 475 476 stateid = nfs4_recoverable_stateid(exception->stateid); 477 if (stateid == NULL && state != NULL) 478 stateid = nfs4_recoverable_stateid(&state->stateid); 479 480 switch(errorcode) { 481 case 0: 482 return 0; 483 case -NFS4ERR_BADHANDLE: 484 case -ESTALE: 485 if (inode != NULL && S_ISREG(inode->i_mode)) 486 pnfs_destroy_layout(NFS_I(inode)); 487 break; 488 case -NFS4ERR_DELEG_REVOKED: 489 case -NFS4ERR_ADMIN_REVOKED: 490 case -NFS4ERR_EXPIRED: 491 case -NFS4ERR_BAD_STATEID: 492 case -NFS4ERR_PARTNER_NO_AUTH: 493 if (inode != NULL && stateid != NULL) { 494 nfs_inode_find_state_and_recover(inode, 495 stateid); 496 goto wait_on_recovery; 497 } 498 fallthrough; 499 case -NFS4ERR_OPENMODE: 500 if (inode) { 501 int err; 502 503 err = nfs_async_inode_return_delegation(inode, 504 stateid); 505 if (err == 0) 506 goto wait_on_recovery; 507 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 508 exception->retry = 1; 509 break; 510 } 511 } 512 if (state == NULL) 513 break; 514 ret = nfs4_schedule_stateid_recovery(server, state); 515 if (ret < 0) 516 break; 517 goto wait_on_recovery; 518 case -NFS4ERR_STALE_STATEID: 519 case -NFS4ERR_STALE_CLIENTID: 520 nfs4_schedule_lease_recovery(clp); 521 goto wait_on_recovery; 522 case -NFS4ERR_MOVED: 523 ret = nfs4_schedule_migration_recovery(server); 524 if (ret < 0) 525 break; 526 goto wait_on_recovery; 527 case -NFS4ERR_LEASE_MOVED: 528 nfs4_schedule_lease_moved_recovery(clp); 529 goto wait_on_recovery; 530 #if defined(CONFIG_NFS_V4_1) 531 case -NFS4ERR_BADSESSION: 532 case -NFS4ERR_BADSLOT: 533 case -NFS4ERR_BAD_HIGH_SLOT: 534 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 535 case -NFS4ERR_DEADSESSION: 536 case -NFS4ERR_SEQ_FALSE_RETRY: 537 case -NFS4ERR_SEQ_MISORDERED: 538 /* Handled in nfs41_sequence_process() */ 539 goto wait_on_recovery; 540 #endif /* defined(CONFIG_NFS_V4_1) */ 541 case -NFS4ERR_FILE_OPEN: 542 if (exception->timeout > HZ) { 543 /* We have retried a decent amount, time to 544 * fail 545 */ 546 ret = -EBUSY; 547 break; 548 } 549 fallthrough; 550 case -NFS4ERR_DELAY: 551 nfs_inc_server_stats(server, NFSIOS_DELAY); 552 fallthrough; 553 case -NFS4ERR_GRACE: 554 case -NFS4ERR_LAYOUTTRYLATER: 555 case -NFS4ERR_RECALLCONFLICT: 556 exception->delay = 1; 557 return 0; 558 559 case -NFS4ERR_RETRY_UNCACHED_REP: 560 case -NFS4ERR_OLD_STATEID: 561 exception->retry = 1; 562 break; 563 case -NFS4ERR_BADOWNER: 564 /* The following works around a Linux server bug! */ 565 case -NFS4ERR_BADNAME: 566 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 567 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 568 exception->retry = 1; 569 printk(KERN_WARNING "NFS: v4 server %s " 570 "does not accept raw " 571 "uid/gids. " 572 "Reenabling the idmapper.\n", 573 server->nfs_client->cl_hostname); 574 } 575 } 576 /* We failed to handle the error */ 577 return nfs4_map_errors(ret); 578 wait_on_recovery: 579 exception->recovering = 1; 580 return 0; 581 } 582 583 /* This is the error handling routine for processes that are allowed 584 * to sleep. 585 */ 586 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 587 { 588 struct nfs_client *clp = server->nfs_client; 589 int ret; 590 591 ret = nfs4_do_handle_exception(server, errorcode, exception); 592 if (exception->delay) { 593 ret = nfs4_delay(&exception->timeout, 594 exception->interruptible); 595 goto out_retry; 596 } 597 if (exception->recovering) { 598 if (exception->task_is_privileged) 599 return -EDEADLOCK; 600 ret = nfs4_wait_clnt_recover(clp); 601 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 602 return -EIO; 603 goto out_retry; 604 } 605 return ret; 606 out_retry: 607 if (ret == 0) 608 exception->retry = 1; 609 return ret; 610 } 611 612 static int 613 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 614 int errorcode, struct nfs4_exception *exception) 615 { 616 struct nfs_client *clp = server->nfs_client; 617 int ret; 618 619 ret = nfs4_do_handle_exception(server, errorcode, exception); 620 if (exception->delay) { 621 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 622 goto out_retry; 623 } 624 if (exception->recovering) { 625 if (exception->task_is_privileged) 626 return -EDEADLOCK; 627 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 628 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 629 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 630 goto out_retry; 631 } 632 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 633 ret = -EIO; 634 return ret; 635 out_retry: 636 if (ret == 0) { 637 exception->retry = 1; 638 /* 639 * For NFS4ERR_MOVED, the client transport will need to 640 * be recomputed after migration recovery has completed. 641 */ 642 if (errorcode == -NFS4ERR_MOVED) 643 rpc_task_release_transport(task); 644 } 645 return ret; 646 } 647 648 int 649 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 650 struct nfs4_state *state, long *timeout) 651 { 652 struct nfs4_exception exception = { 653 .state = state, 654 }; 655 656 if (task->tk_status >= 0) 657 return 0; 658 if (timeout) 659 exception.timeout = *timeout; 660 task->tk_status = nfs4_async_handle_exception(task, server, 661 task->tk_status, 662 &exception); 663 if (exception.delay && timeout) 664 *timeout = exception.timeout; 665 if (exception.retry) 666 return -EAGAIN; 667 return 0; 668 } 669 670 /* 671 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 672 * or 'false' otherwise. 673 */ 674 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 675 { 676 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 677 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 678 } 679 680 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 681 { 682 spin_lock(&clp->cl_lock); 683 if (time_before(clp->cl_last_renewal,timestamp)) 684 clp->cl_last_renewal = timestamp; 685 spin_unlock(&clp->cl_lock); 686 } 687 688 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 689 { 690 struct nfs_client *clp = server->nfs_client; 691 692 if (!nfs4_has_session(clp)) 693 do_renew_lease(clp, timestamp); 694 } 695 696 struct nfs4_call_sync_data { 697 const struct nfs_server *seq_server; 698 struct nfs4_sequence_args *seq_args; 699 struct nfs4_sequence_res *seq_res; 700 }; 701 702 void nfs4_init_sequence(struct nfs4_sequence_args *args, 703 struct nfs4_sequence_res *res, int cache_reply, 704 int privileged) 705 { 706 args->sa_slot = NULL; 707 args->sa_cache_this = cache_reply; 708 args->sa_privileged = privileged; 709 710 res->sr_slot = NULL; 711 } 712 713 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 714 { 715 struct nfs4_slot *slot = res->sr_slot; 716 struct nfs4_slot_table *tbl; 717 718 tbl = slot->table; 719 spin_lock(&tbl->slot_tbl_lock); 720 if (!nfs41_wake_and_assign_slot(tbl, slot)) 721 nfs4_free_slot(tbl, slot); 722 spin_unlock(&tbl->slot_tbl_lock); 723 724 res->sr_slot = NULL; 725 } 726 727 static int nfs40_sequence_done(struct rpc_task *task, 728 struct nfs4_sequence_res *res) 729 { 730 if (res->sr_slot != NULL) 731 nfs40_sequence_free_slot(res); 732 return 1; 733 } 734 735 #if defined(CONFIG_NFS_V4_1) 736 737 static void nfs41_release_slot(struct nfs4_slot *slot) 738 { 739 struct nfs4_session *session; 740 struct nfs4_slot_table *tbl; 741 bool send_new_highest_used_slotid = false; 742 743 if (!slot) 744 return; 745 tbl = slot->table; 746 session = tbl->session; 747 748 /* Bump the slot sequence number */ 749 if (slot->seq_done) 750 slot->seq_nr++; 751 slot->seq_done = 0; 752 753 spin_lock(&tbl->slot_tbl_lock); 754 /* Be nice to the server: try to ensure that the last transmitted 755 * value for highest_user_slotid <= target_highest_slotid 756 */ 757 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 758 send_new_highest_used_slotid = true; 759 760 if (nfs41_wake_and_assign_slot(tbl, slot)) { 761 send_new_highest_used_slotid = false; 762 goto out_unlock; 763 } 764 nfs4_free_slot(tbl, slot); 765 766 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 767 send_new_highest_used_slotid = false; 768 out_unlock: 769 spin_unlock(&tbl->slot_tbl_lock); 770 if (send_new_highest_used_slotid) 771 nfs41_notify_server(session->clp); 772 if (waitqueue_active(&tbl->slot_waitq)) 773 wake_up_all(&tbl->slot_waitq); 774 } 775 776 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 777 { 778 nfs41_release_slot(res->sr_slot); 779 res->sr_slot = NULL; 780 } 781 782 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 783 u32 seqnr) 784 { 785 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 786 slot->seq_nr_highest_sent = seqnr; 787 } 788 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 789 { 790 nfs4_slot_sequence_record_sent(slot, seqnr); 791 slot->seq_nr_last_acked = seqnr; 792 } 793 794 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 795 struct nfs4_slot *slot) 796 { 797 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 798 if (!IS_ERR(task)) 799 rpc_put_task_async(task); 800 } 801 802 static int nfs41_sequence_process(struct rpc_task *task, 803 struct nfs4_sequence_res *res) 804 { 805 struct nfs4_session *session; 806 struct nfs4_slot *slot = res->sr_slot; 807 struct nfs_client *clp; 808 int status; 809 int ret = 1; 810 811 if (slot == NULL) 812 goto out_noaction; 813 /* don't increment the sequence number if the task wasn't sent */ 814 if (!RPC_WAS_SENT(task) || slot->seq_done) 815 goto out; 816 817 session = slot->table->session; 818 clp = session->clp; 819 820 trace_nfs4_sequence_done(session, res); 821 822 status = res->sr_status; 823 if (task->tk_status == -NFS4ERR_DEADSESSION) 824 status = -NFS4ERR_DEADSESSION; 825 826 /* Check the SEQUENCE operation status */ 827 switch (status) { 828 case 0: 829 /* Mark this sequence number as having been acked */ 830 nfs4_slot_sequence_acked(slot, slot->seq_nr); 831 /* Update the slot's sequence and clientid lease timer */ 832 slot->seq_done = 1; 833 do_renew_lease(clp, res->sr_timestamp); 834 /* Check sequence flags */ 835 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 836 !!slot->privileged); 837 nfs41_update_target_slotid(slot->table, slot, res); 838 break; 839 case 1: 840 /* 841 * sr_status remains 1 if an RPC level error occurred. 842 * The server may or may not have processed the sequence 843 * operation.. 844 */ 845 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 846 slot->seq_done = 1; 847 goto out; 848 case -NFS4ERR_DELAY: 849 /* The server detected a resend of the RPC call and 850 * returned NFS4ERR_DELAY as per Section 2.10.6.2 851 * of RFC5661. 852 */ 853 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 854 __func__, 855 slot->slot_nr, 856 slot->seq_nr); 857 goto out_retry; 858 case -NFS4ERR_RETRY_UNCACHED_REP: 859 case -NFS4ERR_SEQ_FALSE_RETRY: 860 /* 861 * The server thinks we tried to replay a request. 862 * Retry the call after bumping the sequence ID. 863 */ 864 nfs4_slot_sequence_acked(slot, slot->seq_nr); 865 goto retry_new_seq; 866 case -NFS4ERR_BADSLOT: 867 /* 868 * The slot id we used was probably retired. Try again 869 * using a different slot id. 870 */ 871 if (slot->slot_nr < slot->table->target_highest_slotid) 872 goto session_recover; 873 goto retry_nowait; 874 case -NFS4ERR_SEQ_MISORDERED: 875 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 876 /* 877 * Were one or more calls using this slot interrupted? 878 * If the server never received the request, then our 879 * transmitted slot sequence number may be too high. However, 880 * if the server did receive the request then it might 881 * accidentally give us a reply with a mismatched operation. 882 * We can sort this out by sending a lone sequence operation 883 * to the server on the same slot. 884 */ 885 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 886 slot->seq_nr--; 887 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 888 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 889 res->sr_slot = NULL; 890 } 891 goto retry_nowait; 892 } 893 /* 894 * RFC5661: 895 * A retry might be sent while the original request is 896 * still in progress on the replier. The replier SHOULD 897 * deal with the issue by returning NFS4ERR_DELAY as the 898 * reply to SEQUENCE or CB_SEQUENCE operation, but 899 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 900 * 901 * Restart the search after a delay. 902 */ 903 slot->seq_nr = slot->seq_nr_highest_sent; 904 goto out_retry; 905 case -NFS4ERR_BADSESSION: 906 case -NFS4ERR_DEADSESSION: 907 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 908 goto session_recover; 909 default: 910 /* Just update the slot sequence no. */ 911 slot->seq_done = 1; 912 } 913 out: 914 /* The session may be reset by one of the error handlers. */ 915 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 916 out_noaction: 917 return ret; 918 session_recover: 919 nfs4_schedule_session_recovery(session, status); 920 dprintk("%s ERROR: %d Reset session\n", __func__, status); 921 nfs41_sequence_free_slot(res); 922 goto out; 923 retry_new_seq: 924 ++slot->seq_nr; 925 retry_nowait: 926 if (rpc_restart_call_prepare(task)) { 927 nfs41_sequence_free_slot(res); 928 task->tk_status = 0; 929 ret = 0; 930 } 931 goto out; 932 out_retry: 933 if (!rpc_restart_call(task)) 934 goto out; 935 rpc_delay(task, NFS4_POLL_RETRY_MAX); 936 return 0; 937 } 938 939 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 940 { 941 if (!nfs41_sequence_process(task, res)) 942 return 0; 943 if (res->sr_slot != NULL) 944 nfs41_sequence_free_slot(res); 945 return 1; 946 947 } 948 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 949 950 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 951 { 952 if (res->sr_slot == NULL) 953 return 1; 954 if (res->sr_slot->table->session != NULL) 955 return nfs41_sequence_process(task, res); 956 return nfs40_sequence_done(task, res); 957 } 958 959 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 960 { 961 if (res->sr_slot != NULL) { 962 if (res->sr_slot->table->session != NULL) 963 nfs41_sequence_free_slot(res); 964 else 965 nfs40_sequence_free_slot(res); 966 } 967 } 968 969 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 970 { 971 if (res->sr_slot == NULL) 972 return 1; 973 if (!res->sr_slot->table->session) 974 return nfs40_sequence_done(task, res); 975 return nfs41_sequence_done(task, res); 976 } 977 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 978 979 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 980 { 981 struct nfs4_call_sync_data *data = calldata; 982 983 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 984 985 nfs4_setup_sequence(data->seq_server->nfs_client, 986 data->seq_args, data->seq_res, task); 987 } 988 989 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 990 { 991 struct nfs4_call_sync_data *data = calldata; 992 993 nfs41_sequence_done(task, data->seq_res); 994 } 995 996 static const struct rpc_call_ops nfs41_call_sync_ops = { 997 .rpc_call_prepare = nfs41_call_sync_prepare, 998 .rpc_call_done = nfs41_call_sync_done, 999 }; 1000 1001 #else /* !CONFIG_NFS_V4_1 */ 1002 1003 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1004 { 1005 return nfs40_sequence_done(task, res); 1006 } 1007 1008 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1009 { 1010 if (res->sr_slot != NULL) 1011 nfs40_sequence_free_slot(res); 1012 } 1013 1014 int nfs4_sequence_done(struct rpc_task *task, 1015 struct nfs4_sequence_res *res) 1016 { 1017 return nfs40_sequence_done(task, res); 1018 } 1019 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1020 1021 #endif /* !CONFIG_NFS_V4_1 */ 1022 1023 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1024 { 1025 res->sr_timestamp = jiffies; 1026 res->sr_status_flags = 0; 1027 res->sr_status = 1; 1028 } 1029 1030 static 1031 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1032 struct nfs4_sequence_res *res, 1033 struct nfs4_slot *slot) 1034 { 1035 if (!slot) 1036 return; 1037 slot->privileged = args->sa_privileged ? 1 : 0; 1038 args->sa_slot = slot; 1039 1040 res->sr_slot = slot; 1041 } 1042 1043 int nfs4_setup_sequence(struct nfs_client *client, 1044 struct nfs4_sequence_args *args, 1045 struct nfs4_sequence_res *res, 1046 struct rpc_task *task) 1047 { 1048 struct nfs4_session *session = nfs4_get_session(client); 1049 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1050 struct nfs4_slot *slot; 1051 1052 /* slot already allocated? */ 1053 if (res->sr_slot != NULL) 1054 goto out_start; 1055 1056 if (session) 1057 tbl = &session->fc_slot_table; 1058 1059 spin_lock(&tbl->slot_tbl_lock); 1060 /* The state manager will wait until the slot table is empty */ 1061 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1062 goto out_sleep; 1063 1064 slot = nfs4_alloc_slot(tbl); 1065 if (IS_ERR(slot)) { 1066 if (slot == ERR_PTR(-ENOMEM)) 1067 goto out_sleep_timeout; 1068 goto out_sleep; 1069 } 1070 spin_unlock(&tbl->slot_tbl_lock); 1071 1072 nfs4_sequence_attach_slot(args, res, slot); 1073 1074 trace_nfs4_setup_sequence(session, args); 1075 out_start: 1076 nfs41_sequence_res_init(res); 1077 rpc_call_start(task); 1078 return 0; 1079 out_sleep_timeout: 1080 /* Try again in 1/4 second */ 1081 if (args->sa_privileged) 1082 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1083 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1084 else 1085 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1086 NULL, jiffies + (HZ >> 2)); 1087 spin_unlock(&tbl->slot_tbl_lock); 1088 return -EAGAIN; 1089 out_sleep: 1090 if (args->sa_privileged) 1091 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1092 RPC_PRIORITY_PRIVILEGED); 1093 else 1094 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1095 spin_unlock(&tbl->slot_tbl_lock); 1096 return -EAGAIN; 1097 } 1098 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1099 1100 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1101 { 1102 struct nfs4_call_sync_data *data = calldata; 1103 nfs4_setup_sequence(data->seq_server->nfs_client, 1104 data->seq_args, data->seq_res, task); 1105 } 1106 1107 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1108 { 1109 struct nfs4_call_sync_data *data = calldata; 1110 nfs4_sequence_done(task, data->seq_res); 1111 } 1112 1113 static const struct rpc_call_ops nfs40_call_sync_ops = { 1114 .rpc_call_prepare = nfs40_call_sync_prepare, 1115 .rpc_call_done = nfs40_call_sync_done, 1116 }; 1117 1118 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1119 { 1120 int ret; 1121 struct rpc_task *task; 1122 1123 task = rpc_run_task(task_setup); 1124 if (IS_ERR(task)) 1125 return PTR_ERR(task); 1126 1127 ret = task->tk_status; 1128 rpc_put_task(task); 1129 return ret; 1130 } 1131 1132 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1133 struct nfs_server *server, 1134 struct rpc_message *msg, 1135 struct nfs4_sequence_args *args, 1136 struct nfs4_sequence_res *res, 1137 unsigned short task_flags) 1138 { 1139 struct nfs_client *clp = server->nfs_client; 1140 struct nfs4_call_sync_data data = { 1141 .seq_server = server, 1142 .seq_args = args, 1143 .seq_res = res, 1144 }; 1145 struct rpc_task_setup task_setup = { 1146 .rpc_client = clnt, 1147 .rpc_message = msg, 1148 .callback_ops = clp->cl_mvops->call_sync_ops, 1149 .callback_data = &data, 1150 .flags = task_flags, 1151 }; 1152 1153 return nfs4_call_sync_custom(&task_setup); 1154 } 1155 1156 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1157 struct nfs_server *server, 1158 struct rpc_message *msg, 1159 struct nfs4_sequence_args *args, 1160 struct nfs4_sequence_res *res) 1161 { 1162 unsigned short task_flags = 0; 1163 1164 if (server->caps & NFS_CAP_MOVEABLE) 1165 task_flags = RPC_TASK_MOVEABLE; 1166 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1167 } 1168 1169 1170 int nfs4_call_sync(struct rpc_clnt *clnt, 1171 struct nfs_server *server, 1172 struct rpc_message *msg, 1173 struct nfs4_sequence_args *args, 1174 struct nfs4_sequence_res *res, 1175 int cache_reply) 1176 { 1177 nfs4_init_sequence(args, res, cache_reply, 0); 1178 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1179 } 1180 1181 static void 1182 nfs4_inc_nlink_locked(struct inode *inode) 1183 { 1184 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1185 NFS_INO_INVALID_CTIME | 1186 NFS_INO_INVALID_NLINK); 1187 inc_nlink(inode); 1188 } 1189 1190 static void 1191 nfs4_inc_nlink(struct inode *inode) 1192 { 1193 spin_lock(&inode->i_lock); 1194 nfs4_inc_nlink_locked(inode); 1195 spin_unlock(&inode->i_lock); 1196 } 1197 1198 static void 1199 nfs4_dec_nlink_locked(struct inode *inode) 1200 { 1201 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1202 NFS_INO_INVALID_CTIME | 1203 NFS_INO_INVALID_NLINK); 1204 drop_nlink(inode); 1205 } 1206 1207 static void 1208 nfs4_update_changeattr_locked(struct inode *inode, 1209 struct nfs4_change_info *cinfo, 1210 unsigned long timestamp, unsigned long cache_validity) 1211 { 1212 struct nfs_inode *nfsi = NFS_I(inode); 1213 u64 change_attr = inode_peek_iversion_raw(inode); 1214 1215 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1216 if (S_ISDIR(inode->i_mode)) 1217 cache_validity |= NFS_INO_INVALID_DATA; 1218 1219 switch (NFS_SERVER(inode)->change_attr_type) { 1220 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1221 if (cinfo->after == change_attr) 1222 goto out; 1223 break; 1224 default: 1225 if ((s64)(change_attr - cinfo->after) >= 0) 1226 goto out; 1227 } 1228 1229 inode_set_iversion_raw(inode, cinfo->after); 1230 if (!cinfo->atomic || cinfo->before != change_attr) { 1231 if (S_ISDIR(inode->i_mode)) 1232 nfs_force_lookup_revalidate(inode); 1233 1234 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1235 cache_validity |= 1236 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1237 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1238 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1239 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1240 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1241 } 1242 nfsi->attrtimeo_timestamp = jiffies; 1243 nfsi->read_cache_jiffies = timestamp; 1244 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1245 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1246 out: 1247 nfs_set_cache_invalid(inode, cache_validity); 1248 } 1249 1250 void 1251 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1252 unsigned long timestamp, unsigned long cache_validity) 1253 { 1254 spin_lock(&dir->i_lock); 1255 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1256 spin_unlock(&dir->i_lock); 1257 } 1258 1259 struct nfs4_open_createattrs { 1260 struct nfs4_label *label; 1261 struct iattr *sattr; 1262 const __u32 verf[2]; 1263 }; 1264 1265 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1266 int err, struct nfs4_exception *exception) 1267 { 1268 if (err != -EINVAL) 1269 return false; 1270 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1271 return false; 1272 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1273 exception->retry = 1; 1274 return true; 1275 } 1276 1277 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1278 { 1279 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1280 } 1281 1282 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1283 { 1284 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1285 1286 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1287 } 1288 1289 static u32 1290 nfs4_map_atomic_open_share(struct nfs_server *server, 1291 fmode_t fmode, int openflags) 1292 { 1293 u32 res = 0; 1294 1295 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1296 case FMODE_READ: 1297 res = NFS4_SHARE_ACCESS_READ; 1298 break; 1299 case FMODE_WRITE: 1300 res = NFS4_SHARE_ACCESS_WRITE; 1301 break; 1302 case FMODE_READ|FMODE_WRITE: 1303 res = NFS4_SHARE_ACCESS_BOTH; 1304 } 1305 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1306 goto out; 1307 /* Want no delegation if we're using O_DIRECT */ 1308 if (openflags & O_DIRECT) 1309 res |= NFS4_SHARE_WANT_NO_DELEG; 1310 out: 1311 return res; 1312 } 1313 1314 static enum open_claim_type4 1315 nfs4_map_atomic_open_claim(struct nfs_server *server, 1316 enum open_claim_type4 claim) 1317 { 1318 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1319 return claim; 1320 switch (claim) { 1321 default: 1322 return claim; 1323 case NFS4_OPEN_CLAIM_FH: 1324 return NFS4_OPEN_CLAIM_NULL; 1325 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1326 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1327 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1328 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1329 } 1330 } 1331 1332 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1333 { 1334 p->o_res.f_attr = &p->f_attr; 1335 p->o_res.seqid = p->o_arg.seqid; 1336 p->c_res.seqid = p->c_arg.seqid; 1337 p->o_res.server = p->o_arg.server; 1338 p->o_res.access_request = p->o_arg.access; 1339 nfs_fattr_init(&p->f_attr); 1340 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1341 } 1342 1343 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1344 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1345 const struct nfs4_open_createattrs *c, 1346 enum open_claim_type4 claim, 1347 gfp_t gfp_mask) 1348 { 1349 struct dentry *parent = dget_parent(dentry); 1350 struct inode *dir = d_inode(parent); 1351 struct nfs_server *server = NFS_SERVER(dir); 1352 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1353 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1354 struct nfs4_opendata *p; 1355 1356 p = kzalloc(sizeof(*p), gfp_mask); 1357 if (p == NULL) 1358 goto err; 1359 1360 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1361 if (IS_ERR(p->f_attr.label)) 1362 goto err_free_p; 1363 1364 p->a_label = nfs4_label_alloc(server, gfp_mask); 1365 if (IS_ERR(p->a_label)) 1366 goto err_free_f; 1367 1368 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1369 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1370 if (IS_ERR(p->o_arg.seqid)) 1371 goto err_free_label; 1372 nfs_sb_active(dentry->d_sb); 1373 p->dentry = dget(dentry); 1374 p->dir = parent; 1375 p->owner = sp; 1376 atomic_inc(&sp->so_count); 1377 p->o_arg.open_flags = flags; 1378 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1379 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1380 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1381 fmode, flags); 1382 if (flags & O_CREAT) { 1383 p->o_arg.umask = current_umask(); 1384 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1385 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1386 p->o_arg.u.attrs = &p->attrs; 1387 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1388 1389 memcpy(p->o_arg.u.verifier.data, c->verf, 1390 sizeof(p->o_arg.u.verifier.data)); 1391 } 1392 } 1393 /* ask server to check for all possible rights as results 1394 * are cached */ 1395 switch (p->o_arg.claim) { 1396 default: 1397 break; 1398 case NFS4_OPEN_CLAIM_NULL: 1399 case NFS4_OPEN_CLAIM_FH: 1400 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1401 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1402 NFS4_ACCESS_EXECUTE | 1403 nfs_access_xattr_mask(server); 1404 } 1405 p->o_arg.clientid = server->nfs_client->cl_clientid; 1406 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1407 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1408 p->o_arg.name = &dentry->d_name; 1409 p->o_arg.server = server; 1410 p->o_arg.bitmask = nfs4_bitmask(server, label); 1411 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1412 switch (p->o_arg.claim) { 1413 case NFS4_OPEN_CLAIM_NULL: 1414 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1415 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1416 p->o_arg.fh = NFS_FH(dir); 1417 break; 1418 case NFS4_OPEN_CLAIM_PREVIOUS: 1419 case NFS4_OPEN_CLAIM_FH: 1420 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1421 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1422 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1423 } 1424 p->c_arg.fh = &p->o_res.fh; 1425 p->c_arg.stateid = &p->o_res.stateid; 1426 p->c_arg.seqid = p->o_arg.seqid; 1427 nfs4_init_opendata_res(p); 1428 kref_init(&p->kref); 1429 return p; 1430 1431 err_free_label: 1432 nfs4_label_free(p->a_label); 1433 err_free_f: 1434 nfs4_label_free(p->f_attr.label); 1435 err_free_p: 1436 kfree(p); 1437 err: 1438 dput(parent); 1439 return NULL; 1440 } 1441 1442 static void nfs4_opendata_free(struct kref *kref) 1443 { 1444 struct nfs4_opendata *p = container_of(kref, 1445 struct nfs4_opendata, kref); 1446 struct super_block *sb = p->dentry->d_sb; 1447 1448 nfs4_lgopen_release(p->lgp); 1449 nfs_free_seqid(p->o_arg.seqid); 1450 nfs4_sequence_free_slot(&p->o_res.seq_res); 1451 if (p->state != NULL) 1452 nfs4_put_open_state(p->state); 1453 nfs4_put_state_owner(p->owner); 1454 1455 nfs4_label_free(p->a_label); 1456 nfs4_label_free(p->f_attr.label); 1457 1458 dput(p->dir); 1459 dput(p->dentry); 1460 nfs_sb_deactive(sb); 1461 nfs_fattr_free_names(&p->f_attr); 1462 kfree(p->f_attr.mdsthreshold); 1463 kfree(p); 1464 } 1465 1466 static void nfs4_opendata_put(struct nfs4_opendata *p) 1467 { 1468 if (p != NULL) 1469 kref_put(&p->kref, nfs4_opendata_free); 1470 } 1471 1472 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1473 fmode_t fmode) 1474 { 1475 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1476 case FMODE_READ|FMODE_WRITE: 1477 return state->n_rdwr != 0; 1478 case FMODE_WRITE: 1479 return state->n_wronly != 0; 1480 case FMODE_READ: 1481 return state->n_rdonly != 0; 1482 } 1483 WARN_ON_ONCE(1); 1484 return false; 1485 } 1486 1487 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1488 int open_mode, enum open_claim_type4 claim) 1489 { 1490 int ret = 0; 1491 1492 if (open_mode & (O_EXCL|O_TRUNC)) 1493 goto out; 1494 switch (claim) { 1495 case NFS4_OPEN_CLAIM_NULL: 1496 case NFS4_OPEN_CLAIM_FH: 1497 goto out; 1498 default: 1499 break; 1500 } 1501 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1502 case FMODE_READ: 1503 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1504 && state->n_rdonly != 0; 1505 break; 1506 case FMODE_WRITE: 1507 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1508 && state->n_wronly != 0; 1509 break; 1510 case FMODE_READ|FMODE_WRITE: 1511 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1512 && state->n_rdwr != 0; 1513 } 1514 out: 1515 return ret; 1516 } 1517 1518 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1519 enum open_claim_type4 claim) 1520 { 1521 if (delegation == NULL) 1522 return 0; 1523 if ((delegation->type & fmode) != fmode) 1524 return 0; 1525 switch (claim) { 1526 case NFS4_OPEN_CLAIM_NULL: 1527 case NFS4_OPEN_CLAIM_FH: 1528 break; 1529 case NFS4_OPEN_CLAIM_PREVIOUS: 1530 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1531 break; 1532 fallthrough; 1533 default: 1534 return 0; 1535 } 1536 nfs_mark_delegation_referenced(delegation); 1537 return 1; 1538 } 1539 1540 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1541 { 1542 switch (fmode) { 1543 case FMODE_WRITE: 1544 state->n_wronly++; 1545 break; 1546 case FMODE_READ: 1547 state->n_rdonly++; 1548 break; 1549 case FMODE_READ|FMODE_WRITE: 1550 state->n_rdwr++; 1551 } 1552 nfs4_state_set_mode_locked(state, state->state | fmode); 1553 } 1554 1555 #ifdef CONFIG_NFS_V4_1 1556 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1557 { 1558 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1559 return true; 1560 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1561 return true; 1562 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1563 return true; 1564 return false; 1565 } 1566 #endif /* CONFIG_NFS_V4_1 */ 1567 1568 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1569 { 1570 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1571 wake_up_all(&state->waitq); 1572 } 1573 1574 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1575 { 1576 struct nfs_client *clp = state->owner->so_server->nfs_client; 1577 bool need_recover = false; 1578 1579 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1580 need_recover = true; 1581 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1582 need_recover = true; 1583 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1584 need_recover = true; 1585 if (need_recover) 1586 nfs4_state_mark_reclaim_nograce(clp, state); 1587 } 1588 1589 /* 1590 * Check for whether or not the caller may update the open stateid 1591 * to the value passed in by stateid. 1592 * 1593 * Note: This function relies heavily on the server implementing 1594 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1595 * correctly. 1596 * i.e. The stateid seqids have to be initialised to 1, and 1597 * are then incremented on every state transition. 1598 */ 1599 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1600 const nfs4_stateid *stateid) 1601 { 1602 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1603 /* The common case - we're updating to a new sequence number */ 1604 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1605 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1606 return true; 1607 return false; 1608 } 1609 /* The server returned a new stateid */ 1610 } 1611 /* This is the first OPEN in this generation */ 1612 if (stateid->seqid == cpu_to_be32(1)) 1613 return true; 1614 return false; 1615 } 1616 1617 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1618 { 1619 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1620 return; 1621 if (state->n_wronly) 1622 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1623 if (state->n_rdonly) 1624 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1625 if (state->n_rdwr) 1626 set_bit(NFS_O_RDWR_STATE, &state->flags); 1627 set_bit(NFS_OPEN_STATE, &state->flags); 1628 } 1629 1630 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1631 nfs4_stateid *stateid, fmode_t fmode) 1632 { 1633 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1634 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1635 case FMODE_WRITE: 1636 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1637 break; 1638 case FMODE_READ: 1639 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1640 break; 1641 case 0: 1642 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1643 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1644 clear_bit(NFS_OPEN_STATE, &state->flags); 1645 } 1646 if (stateid == NULL) 1647 return; 1648 /* Handle OPEN+OPEN_DOWNGRADE races */ 1649 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1650 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1651 nfs_resync_open_stateid_locked(state); 1652 goto out; 1653 } 1654 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1655 nfs4_stateid_copy(&state->stateid, stateid); 1656 nfs4_stateid_copy(&state->open_stateid, stateid); 1657 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1658 out: 1659 nfs_state_log_update_open_stateid(state); 1660 } 1661 1662 static void nfs_clear_open_stateid(struct nfs4_state *state, 1663 nfs4_stateid *arg_stateid, 1664 nfs4_stateid *stateid, fmode_t fmode) 1665 { 1666 write_seqlock(&state->seqlock); 1667 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1668 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1669 nfs_clear_open_stateid_locked(state, stateid, fmode); 1670 write_sequnlock(&state->seqlock); 1671 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1672 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1673 } 1674 1675 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1676 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1677 __must_hold(&state->owner->so_lock) 1678 __must_hold(&state->seqlock) 1679 __must_hold(RCU) 1680 1681 { 1682 DEFINE_WAIT(wait); 1683 int status = 0; 1684 for (;;) { 1685 1686 if (nfs_stateid_is_sequential(state, stateid)) 1687 break; 1688 1689 if (status) 1690 break; 1691 /* Rely on seqids for serialisation with NFSv4.0 */ 1692 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1693 break; 1694 1695 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1696 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1697 /* 1698 * Ensure we process the state changes in the same order 1699 * in which the server processed them by delaying the 1700 * update of the stateid until we are in sequence. 1701 */ 1702 write_sequnlock(&state->seqlock); 1703 spin_unlock(&state->owner->so_lock); 1704 rcu_read_unlock(); 1705 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1706 1707 if (!fatal_signal_pending(current)) { 1708 if (schedule_timeout(5*HZ) == 0) 1709 status = -EAGAIN; 1710 else 1711 status = 0; 1712 } else 1713 status = -EINTR; 1714 finish_wait(&state->waitq, &wait); 1715 rcu_read_lock(); 1716 spin_lock(&state->owner->so_lock); 1717 write_seqlock(&state->seqlock); 1718 } 1719 1720 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1721 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1722 nfs4_stateid_copy(freeme, &state->open_stateid); 1723 nfs_test_and_clear_all_open_stateid(state); 1724 } 1725 1726 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1727 nfs4_stateid_copy(&state->stateid, stateid); 1728 nfs4_stateid_copy(&state->open_stateid, stateid); 1729 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1730 nfs_state_log_update_open_stateid(state); 1731 } 1732 1733 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1734 const nfs4_stateid *open_stateid, 1735 fmode_t fmode, 1736 nfs4_stateid *freeme) 1737 { 1738 /* 1739 * Protect the call to nfs4_state_set_mode_locked and 1740 * serialise the stateid update 1741 */ 1742 write_seqlock(&state->seqlock); 1743 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1744 switch (fmode) { 1745 case FMODE_READ: 1746 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1747 break; 1748 case FMODE_WRITE: 1749 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1750 break; 1751 case FMODE_READ|FMODE_WRITE: 1752 set_bit(NFS_O_RDWR_STATE, &state->flags); 1753 } 1754 set_bit(NFS_OPEN_STATE, &state->flags); 1755 write_sequnlock(&state->seqlock); 1756 } 1757 1758 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1759 { 1760 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1761 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1762 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1763 clear_bit(NFS_OPEN_STATE, &state->flags); 1764 } 1765 1766 static void nfs_state_set_delegation(struct nfs4_state *state, 1767 const nfs4_stateid *deleg_stateid, 1768 fmode_t fmode) 1769 { 1770 /* 1771 * Protect the call to nfs4_state_set_mode_locked and 1772 * serialise the stateid update 1773 */ 1774 write_seqlock(&state->seqlock); 1775 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1776 set_bit(NFS_DELEGATED_STATE, &state->flags); 1777 write_sequnlock(&state->seqlock); 1778 } 1779 1780 static void nfs_state_clear_delegation(struct nfs4_state *state) 1781 { 1782 write_seqlock(&state->seqlock); 1783 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1784 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1785 write_sequnlock(&state->seqlock); 1786 } 1787 1788 int update_open_stateid(struct nfs4_state *state, 1789 const nfs4_stateid *open_stateid, 1790 const nfs4_stateid *delegation, 1791 fmode_t fmode) 1792 { 1793 struct nfs_server *server = NFS_SERVER(state->inode); 1794 struct nfs_client *clp = server->nfs_client; 1795 struct nfs_inode *nfsi = NFS_I(state->inode); 1796 struct nfs_delegation *deleg_cur; 1797 nfs4_stateid freeme = { }; 1798 int ret = 0; 1799 1800 fmode &= (FMODE_READ|FMODE_WRITE); 1801 1802 rcu_read_lock(); 1803 spin_lock(&state->owner->so_lock); 1804 if (open_stateid != NULL) { 1805 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1806 ret = 1; 1807 } 1808 1809 deleg_cur = nfs4_get_valid_delegation(state->inode); 1810 if (deleg_cur == NULL) 1811 goto no_delegation; 1812 1813 spin_lock(&deleg_cur->lock); 1814 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1815 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1816 (deleg_cur->type & fmode) != fmode) 1817 goto no_delegation_unlock; 1818 1819 if (delegation == NULL) 1820 delegation = &deleg_cur->stateid; 1821 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1822 goto no_delegation_unlock; 1823 1824 nfs_mark_delegation_referenced(deleg_cur); 1825 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1826 ret = 1; 1827 no_delegation_unlock: 1828 spin_unlock(&deleg_cur->lock); 1829 no_delegation: 1830 if (ret) 1831 update_open_stateflags(state, fmode); 1832 spin_unlock(&state->owner->so_lock); 1833 rcu_read_unlock(); 1834 1835 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1836 nfs4_schedule_state_manager(clp); 1837 if (freeme.type != 0) 1838 nfs4_test_and_free_stateid(server, &freeme, 1839 state->owner->so_cred); 1840 1841 return ret; 1842 } 1843 1844 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1845 const nfs4_stateid *stateid) 1846 { 1847 struct nfs4_state *state = lsp->ls_state; 1848 bool ret = false; 1849 1850 spin_lock(&state->state_lock); 1851 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1852 goto out_noupdate; 1853 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1854 goto out_noupdate; 1855 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1856 ret = true; 1857 out_noupdate: 1858 spin_unlock(&state->state_lock); 1859 return ret; 1860 } 1861 1862 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1863 { 1864 struct nfs_delegation *delegation; 1865 1866 fmode &= FMODE_READ|FMODE_WRITE; 1867 rcu_read_lock(); 1868 delegation = nfs4_get_valid_delegation(inode); 1869 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1870 rcu_read_unlock(); 1871 return; 1872 } 1873 rcu_read_unlock(); 1874 nfs4_inode_return_delegation(inode); 1875 } 1876 1877 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1878 { 1879 struct nfs4_state *state = opendata->state; 1880 struct nfs_delegation *delegation; 1881 int open_mode = opendata->o_arg.open_flags; 1882 fmode_t fmode = opendata->o_arg.fmode; 1883 enum open_claim_type4 claim = opendata->o_arg.claim; 1884 nfs4_stateid stateid; 1885 int ret = -EAGAIN; 1886 1887 for (;;) { 1888 spin_lock(&state->owner->so_lock); 1889 if (can_open_cached(state, fmode, open_mode, claim)) { 1890 update_open_stateflags(state, fmode); 1891 spin_unlock(&state->owner->so_lock); 1892 goto out_return_state; 1893 } 1894 spin_unlock(&state->owner->so_lock); 1895 rcu_read_lock(); 1896 delegation = nfs4_get_valid_delegation(state->inode); 1897 if (!can_open_delegated(delegation, fmode, claim)) { 1898 rcu_read_unlock(); 1899 break; 1900 } 1901 /* Save the delegation */ 1902 nfs4_stateid_copy(&stateid, &delegation->stateid); 1903 rcu_read_unlock(); 1904 nfs_release_seqid(opendata->o_arg.seqid); 1905 if (!opendata->is_recover) { 1906 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1907 if (ret != 0) 1908 goto out; 1909 } 1910 ret = -EAGAIN; 1911 1912 /* Try to update the stateid using the delegation */ 1913 if (update_open_stateid(state, NULL, &stateid, fmode)) 1914 goto out_return_state; 1915 } 1916 out: 1917 return ERR_PTR(ret); 1918 out_return_state: 1919 refcount_inc(&state->count); 1920 return state; 1921 } 1922 1923 static void 1924 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1925 { 1926 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1927 struct nfs_delegation *delegation; 1928 int delegation_flags = 0; 1929 1930 rcu_read_lock(); 1931 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1932 if (delegation) 1933 delegation_flags = delegation->flags; 1934 rcu_read_unlock(); 1935 switch (data->o_arg.claim) { 1936 default: 1937 break; 1938 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1939 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1940 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1941 "returning a delegation for " 1942 "OPEN(CLAIM_DELEGATE_CUR)\n", 1943 clp->cl_hostname); 1944 return; 1945 } 1946 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1947 nfs_inode_set_delegation(state->inode, 1948 data->owner->so_cred, 1949 data->o_res.delegation_type, 1950 &data->o_res.delegation, 1951 data->o_res.pagemod_limit); 1952 else 1953 nfs_inode_reclaim_delegation(state->inode, 1954 data->owner->so_cred, 1955 data->o_res.delegation_type, 1956 &data->o_res.delegation, 1957 data->o_res.pagemod_limit); 1958 1959 if (data->o_res.do_recall) 1960 nfs_async_inode_return_delegation(state->inode, 1961 &data->o_res.delegation); 1962 } 1963 1964 /* 1965 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1966 * and update the nfs4_state. 1967 */ 1968 static struct nfs4_state * 1969 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1970 { 1971 struct inode *inode = data->state->inode; 1972 struct nfs4_state *state = data->state; 1973 int ret; 1974 1975 if (!data->rpc_done) { 1976 if (data->rpc_status) 1977 return ERR_PTR(data->rpc_status); 1978 /* cached opens have already been processed */ 1979 goto update; 1980 } 1981 1982 ret = nfs_refresh_inode(inode, &data->f_attr); 1983 if (ret) 1984 return ERR_PTR(ret); 1985 1986 if (data->o_res.delegation_type != 0) 1987 nfs4_opendata_check_deleg(data, state); 1988 update: 1989 if (!update_open_stateid(state, &data->o_res.stateid, 1990 NULL, data->o_arg.fmode)) 1991 return ERR_PTR(-EAGAIN); 1992 refcount_inc(&state->count); 1993 1994 return state; 1995 } 1996 1997 static struct inode * 1998 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1999 { 2000 struct inode *inode; 2001 2002 switch (data->o_arg.claim) { 2003 case NFS4_OPEN_CLAIM_NULL: 2004 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2005 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2006 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2007 return ERR_PTR(-EAGAIN); 2008 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2009 &data->f_attr); 2010 break; 2011 default: 2012 inode = d_inode(data->dentry); 2013 ihold(inode); 2014 nfs_refresh_inode(inode, &data->f_attr); 2015 } 2016 return inode; 2017 } 2018 2019 static struct nfs4_state * 2020 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2021 { 2022 struct nfs4_state *state; 2023 struct inode *inode; 2024 2025 inode = nfs4_opendata_get_inode(data); 2026 if (IS_ERR(inode)) 2027 return ERR_CAST(inode); 2028 if (data->state != NULL && data->state->inode == inode) { 2029 state = data->state; 2030 refcount_inc(&state->count); 2031 } else 2032 state = nfs4_get_open_state(inode, data->owner); 2033 iput(inode); 2034 if (state == NULL) 2035 state = ERR_PTR(-ENOMEM); 2036 return state; 2037 } 2038 2039 static struct nfs4_state * 2040 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2041 { 2042 struct nfs4_state *state; 2043 2044 if (!data->rpc_done) { 2045 state = nfs4_try_open_cached(data); 2046 trace_nfs4_cached_open(data->state); 2047 goto out; 2048 } 2049 2050 state = nfs4_opendata_find_nfs4_state(data); 2051 if (IS_ERR(state)) 2052 goto out; 2053 2054 if (data->o_res.delegation_type != 0) 2055 nfs4_opendata_check_deleg(data, state); 2056 if (!update_open_stateid(state, &data->o_res.stateid, 2057 NULL, data->o_arg.fmode)) { 2058 nfs4_put_open_state(state); 2059 state = ERR_PTR(-EAGAIN); 2060 } 2061 out: 2062 nfs_release_seqid(data->o_arg.seqid); 2063 return state; 2064 } 2065 2066 static struct nfs4_state * 2067 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2068 { 2069 struct nfs4_state *ret; 2070 2071 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2072 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2073 else 2074 ret = _nfs4_opendata_to_nfs4_state(data); 2075 nfs4_sequence_free_slot(&data->o_res.seq_res); 2076 return ret; 2077 } 2078 2079 static struct nfs_open_context * 2080 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2081 { 2082 struct nfs_inode *nfsi = NFS_I(state->inode); 2083 struct nfs_open_context *ctx; 2084 2085 rcu_read_lock(); 2086 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2087 if (ctx->state != state) 2088 continue; 2089 if ((ctx->mode & mode) != mode) 2090 continue; 2091 if (!get_nfs_open_context(ctx)) 2092 continue; 2093 rcu_read_unlock(); 2094 return ctx; 2095 } 2096 rcu_read_unlock(); 2097 return ERR_PTR(-ENOENT); 2098 } 2099 2100 static struct nfs_open_context * 2101 nfs4_state_find_open_context(struct nfs4_state *state) 2102 { 2103 struct nfs_open_context *ctx; 2104 2105 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2106 if (!IS_ERR(ctx)) 2107 return ctx; 2108 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2109 if (!IS_ERR(ctx)) 2110 return ctx; 2111 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2112 } 2113 2114 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2115 struct nfs4_state *state, enum open_claim_type4 claim) 2116 { 2117 struct nfs4_opendata *opendata; 2118 2119 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2120 NULL, claim, GFP_NOFS); 2121 if (opendata == NULL) 2122 return ERR_PTR(-ENOMEM); 2123 opendata->state = state; 2124 refcount_inc(&state->count); 2125 return opendata; 2126 } 2127 2128 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2129 fmode_t fmode) 2130 { 2131 struct nfs4_state *newstate; 2132 int ret; 2133 2134 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2135 return 0; 2136 opendata->o_arg.open_flags = 0; 2137 opendata->o_arg.fmode = fmode; 2138 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 2139 NFS_SB(opendata->dentry->d_sb), 2140 fmode, 0); 2141 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2142 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2143 nfs4_init_opendata_res(opendata); 2144 ret = _nfs4_recover_proc_open(opendata); 2145 if (ret != 0) 2146 return ret; 2147 newstate = nfs4_opendata_to_nfs4_state(opendata); 2148 if (IS_ERR(newstate)) 2149 return PTR_ERR(newstate); 2150 if (newstate != opendata->state) 2151 ret = -ESTALE; 2152 nfs4_close_state(newstate, fmode); 2153 return ret; 2154 } 2155 2156 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2157 { 2158 int ret; 2159 2160 /* memory barrier prior to reading state->n_* */ 2161 smp_rmb(); 2162 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2163 if (ret != 0) 2164 return ret; 2165 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2166 if (ret != 0) 2167 return ret; 2168 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2169 if (ret != 0) 2170 return ret; 2171 /* 2172 * We may have performed cached opens for all three recoveries. 2173 * Check if we need to update the current stateid. 2174 */ 2175 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2176 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2177 write_seqlock(&state->seqlock); 2178 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2179 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2180 write_sequnlock(&state->seqlock); 2181 } 2182 return 0; 2183 } 2184 2185 /* 2186 * OPEN_RECLAIM: 2187 * reclaim state on the server after a reboot. 2188 */ 2189 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2190 { 2191 struct nfs_delegation *delegation; 2192 struct nfs4_opendata *opendata; 2193 fmode_t delegation_type = 0; 2194 int status; 2195 2196 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2197 NFS4_OPEN_CLAIM_PREVIOUS); 2198 if (IS_ERR(opendata)) 2199 return PTR_ERR(opendata); 2200 rcu_read_lock(); 2201 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2202 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2203 delegation_type = delegation->type; 2204 rcu_read_unlock(); 2205 opendata->o_arg.u.delegation_type = delegation_type; 2206 status = nfs4_open_recover(opendata, state); 2207 nfs4_opendata_put(opendata); 2208 return status; 2209 } 2210 2211 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2212 { 2213 struct nfs_server *server = NFS_SERVER(state->inode); 2214 struct nfs4_exception exception = { }; 2215 int err; 2216 do { 2217 err = _nfs4_do_open_reclaim(ctx, state); 2218 trace_nfs4_open_reclaim(ctx, 0, err); 2219 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2220 continue; 2221 if (err != -NFS4ERR_DELAY) 2222 break; 2223 nfs4_handle_exception(server, err, &exception); 2224 } while (exception.retry); 2225 return err; 2226 } 2227 2228 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2229 { 2230 struct nfs_open_context *ctx; 2231 int ret; 2232 2233 ctx = nfs4_state_find_open_context(state); 2234 if (IS_ERR(ctx)) 2235 return -EAGAIN; 2236 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2237 nfs_state_clear_open_state_flags(state); 2238 ret = nfs4_do_open_reclaim(ctx, state); 2239 put_nfs_open_context(ctx); 2240 return ret; 2241 } 2242 2243 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) 2244 { 2245 switch (err) { 2246 default: 2247 printk(KERN_ERR "NFS: %s: unhandled error " 2248 "%d.\n", __func__, err); 2249 fallthrough; 2250 case 0: 2251 case -ENOENT: 2252 case -EAGAIN: 2253 case -ESTALE: 2254 case -ETIMEDOUT: 2255 break; 2256 case -NFS4ERR_BADSESSION: 2257 case -NFS4ERR_BADSLOT: 2258 case -NFS4ERR_BAD_HIGH_SLOT: 2259 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2260 case -NFS4ERR_DEADSESSION: 2261 return -EAGAIN; 2262 case -NFS4ERR_STALE_CLIENTID: 2263 case -NFS4ERR_STALE_STATEID: 2264 /* Don't recall a delegation if it was lost */ 2265 nfs4_schedule_lease_recovery(server->nfs_client); 2266 return -EAGAIN; 2267 case -NFS4ERR_MOVED: 2268 nfs4_schedule_migration_recovery(server); 2269 return -EAGAIN; 2270 case -NFS4ERR_LEASE_MOVED: 2271 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2272 return -EAGAIN; 2273 case -NFS4ERR_DELEG_REVOKED: 2274 case -NFS4ERR_ADMIN_REVOKED: 2275 case -NFS4ERR_EXPIRED: 2276 case -NFS4ERR_BAD_STATEID: 2277 case -NFS4ERR_OPENMODE: 2278 nfs_inode_find_state_and_recover(state->inode, 2279 stateid); 2280 nfs4_schedule_stateid_recovery(server, state); 2281 return -EAGAIN; 2282 case -NFS4ERR_DELAY: 2283 case -NFS4ERR_GRACE: 2284 ssleep(1); 2285 return -EAGAIN; 2286 case -ENOMEM: 2287 case -NFS4ERR_DENIED: 2288 if (fl) { 2289 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2290 if (lsp) 2291 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2292 } 2293 return 0; 2294 } 2295 return err; 2296 } 2297 2298 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2299 struct nfs4_state *state, const nfs4_stateid *stateid) 2300 { 2301 struct nfs_server *server = NFS_SERVER(state->inode); 2302 struct nfs4_opendata *opendata; 2303 int err = 0; 2304 2305 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2306 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2307 if (IS_ERR(opendata)) 2308 return PTR_ERR(opendata); 2309 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2310 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2311 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2312 if (err) 2313 goto out; 2314 } 2315 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2316 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2317 if (err) 2318 goto out; 2319 } 2320 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2321 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2322 if (err) 2323 goto out; 2324 } 2325 nfs_state_clear_delegation(state); 2326 out: 2327 nfs4_opendata_put(opendata); 2328 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2329 } 2330 2331 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2332 { 2333 struct nfs4_opendata *data = calldata; 2334 2335 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2336 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2337 } 2338 2339 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2340 { 2341 struct nfs4_opendata *data = calldata; 2342 2343 nfs40_sequence_done(task, &data->c_res.seq_res); 2344 2345 data->rpc_status = task->tk_status; 2346 if (data->rpc_status == 0) { 2347 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2348 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2349 renew_lease(data->o_res.server, data->timestamp); 2350 data->rpc_done = true; 2351 } 2352 } 2353 2354 static void nfs4_open_confirm_release(void *calldata) 2355 { 2356 struct nfs4_opendata *data = calldata; 2357 struct nfs4_state *state = NULL; 2358 2359 /* If this request hasn't been cancelled, do nothing */ 2360 if (!data->cancelled) 2361 goto out_free; 2362 /* In case of error, no cleanup! */ 2363 if (!data->rpc_done) 2364 goto out_free; 2365 state = nfs4_opendata_to_nfs4_state(data); 2366 if (!IS_ERR(state)) 2367 nfs4_close_state(state, data->o_arg.fmode); 2368 out_free: 2369 nfs4_opendata_put(data); 2370 } 2371 2372 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2373 .rpc_call_prepare = nfs4_open_confirm_prepare, 2374 .rpc_call_done = nfs4_open_confirm_done, 2375 .rpc_release = nfs4_open_confirm_release, 2376 }; 2377 2378 /* 2379 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2380 */ 2381 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2382 { 2383 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2384 struct rpc_task *task; 2385 struct rpc_message msg = { 2386 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2387 .rpc_argp = &data->c_arg, 2388 .rpc_resp = &data->c_res, 2389 .rpc_cred = data->owner->so_cred, 2390 }; 2391 struct rpc_task_setup task_setup_data = { 2392 .rpc_client = server->client, 2393 .rpc_message = &msg, 2394 .callback_ops = &nfs4_open_confirm_ops, 2395 .callback_data = data, 2396 .workqueue = nfsiod_workqueue, 2397 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2398 }; 2399 int status; 2400 2401 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2402 data->is_recover); 2403 kref_get(&data->kref); 2404 data->rpc_done = false; 2405 data->rpc_status = 0; 2406 data->timestamp = jiffies; 2407 task = rpc_run_task(&task_setup_data); 2408 if (IS_ERR(task)) 2409 return PTR_ERR(task); 2410 status = rpc_wait_for_completion_task(task); 2411 if (status != 0) { 2412 data->cancelled = true; 2413 smp_wmb(); 2414 } else 2415 status = data->rpc_status; 2416 rpc_put_task(task); 2417 return status; 2418 } 2419 2420 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2421 { 2422 struct nfs4_opendata *data = calldata; 2423 struct nfs4_state_owner *sp = data->owner; 2424 struct nfs_client *clp = sp->so_server->nfs_client; 2425 enum open_claim_type4 claim = data->o_arg.claim; 2426 2427 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2428 goto out_wait; 2429 /* 2430 * Check if we still need to send an OPEN call, or if we can use 2431 * a delegation instead. 2432 */ 2433 if (data->state != NULL) { 2434 struct nfs_delegation *delegation; 2435 2436 if (can_open_cached(data->state, data->o_arg.fmode, 2437 data->o_arg.open_flags, claim)) 2438 goto out_no_action; 2439 rcu_read_lock(); 2440 delegation = nfs4_get_valid_delegation(data->state->inode); 2441 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2442 goto unlock_no_action; 2443 rcu_read_unlock(); 2444 } 2445 /* Update client id. */ 2446 data->o_arg.clientid = clp->cl_clientid; 2447 switch (claim) { 2448 default: 2449 break; 2450 case NFS4_OPEN_CLAIM_PREVIOUS: 2451 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2452 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2453 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2454 fallthrough; 2455 case NFS4_OPEN_CLAIM_FH: 2456 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2457 } 2458 data->timestamp = jiffies; 2459 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2460 &data->o_arg.seq_args, 2461 &data->o_res.seq_res, 2462 task) != 0) 2463 nfs_release_seqid(data->o_arg.seqid); 2464 2465 /* Set the create mode (note dependency on the session type) */ 2466 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2467 if (data->o_arg.open_flags & O_EXCL) { 2468 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2469 if (clp->cl_mvops->minor_version == 0) { 2470 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2471 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2472 * because ACCESS will return permission denied for 2473 * all bits until close */ 2474 data->o_res.access_request = data->o_arg.access = 0; 2475 } else if (nfs4_has_persistent_session(clp)) 2476 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2477 } 2478 return; 2479 unlock_no_action: 2480 trace_nfs4_cached_open(data->state); 2481 rcu_read_unlock(); 2482 out_no_action: 2483 task->tk_action = NULL; 2484 out_wait: 2485 nfs4_sequence_done(task, &data->o_res.seq_res); 2486 } 2487 2488 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2489 { 2490 struct nfs4_opendata *data = calldata; 2491 2492 data->rpc_status = task->tk_status; 2493 2494 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2495 return; 2496 2497 if (task->tk_status == 0) { 2498 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2499 switch (data->o_res.f_attr->mode & S_IFMT) { 2500 case S_IFREG: 2501 break; 2502 case S_IFLNK: 2503 data->rpc_status = -ELOOP; 2504 break; 2505 case S_IFDIR: 2506 data->rpc_status = -EISDIR; 2507 break; 2508 default: 2509 data->rpc_status = -ENOTDIR; 2510 } 2511 } 2512 renew_lease(data->o_res.server, data->timestamp); 2513 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2514 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2515 } 2516 data->rpc_done = true; 2517 } 2518 2519 static void nfs4_open_release(void *calldata) 2520 { 2521 struct nfs4_opendata *data = calldata; 2522 struct nfs4_state *state = NULL; 2523 2524 /* If this request hasn't been cancelled, do nothing */ 2525 if (!data->cancelled) 2526 goto out_free; 2527 /* In case of error, no cleanup! */ 2528 if (data->rpc_status != 0 || !data->rpc_done) 2529 goto out_free; 2530 /* In case we need an open_confirm, no cleanup! */ 2531 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2532 goto out_free; 2533 state = nfs4_opendata_to_nfs4_state(data); 2534 if (!IS_ERR(state)) 2535 nfs4_close_state(state, data->o_arg.fmode); 2536 out_free: 2537 nfs4_opendata_put(data); 2538 } 2539 2540 static const struct rpc_call_ops nfs4_open_ops = { 2541 .rpc_call_prepare = nfs4_open_prepare, 2542 .rpc_call_done = nfs4_open_done, 2543 .rpc_release = nfs4_open_release, 2544 }; 2545 2546 static int nfs4_run_open_task(struct nfs4_opendata *data, 2547 struct nfs_open_context *ctx) 2548 { 2549 struct inode *dir = d_inode(data->dir); 2550 struct nfs_server *server = NFS_SERVER(dir); 2551 struct nfs_openargs *o_arg = &data->o_arg; 2552 struct nfs_openres *o_res = &data->o_res; 2553 struct rpc_task *task; 2554 struct rpc_message msg = { 2555 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2556 .rpc_argp = o_arg, 2557 .rpc_resp = o_res, 2558 .rpc_cred = data->owner->so_cred, 2559 }; 2560 struct rpc_task_setup task_setup_data = { 2561 .rpc_client = server->client, 2562 .rpc_message = &msg, 2563 .callback_ops = &nfs4_open_ops, 2564 .callback_data = data, 2565 .workqueue = nfsiod_workqueue, 2566 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2567 }; 2568 int status; 2569 2570 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2571 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2572 2573 kref_get(&data->kref); 2574 data->rpc_done = false; 2575 data->rpc_status = 0; 2576 data->cancelled = false; 2577 data->is_recover = false; 2578 if (!ctx) { 2579 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2580 data->is_recover = true; 2581 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2582 } else { 2583 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2584 pnfs_lgopen_prepare(data, ctx); 2585 } 2586 task = rpc_run_task(&task_setup_data); 2587 if (IS_ERR(task)) 2588 return PTR_ERR(task); 2589 status = rpc_wait_for_completion_task(task); 2590 if (status != 0) { 2591 data->cancelled = true; 2592 smp_wmb(); 2593 } else 2594 status = data->rpc_status; 2595 rpc_put_task(task); 2596 2597 return status; 2598 } 2599 2600 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2601 { 2602 struct inode *dir = d_inode(data->dir); 2603 struct nfs_openres *o_res = &data->o_res; 2604 int status; 2605 2606 status = nfs4_run_open_task(data, NULL); 2607 if (status != 0 || !data->rpc_done) 2608 return status; 2609 2610 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2611 2612 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2613 status = _nfs4_proc_open_confirm(data); 2614 2615 return status; 2616 } 2617 2618 /* 2619 * Additional permission checks in order to distinguish between an 2620 * open for read, and an open for execute. This works around the 2621 * fact that NFSv4 OPEN treats read and execute permissions as being 2622 * the same. 2623 * Note that in the non-execute case, we want to turn off permission 2624 * checking if we just created a new file (POSIX open() semantics). 2625 */ 2626 static int nfs4_opendata_access(const struct cred *cred, 2627 struct nfs4_opendata *opendata, 2628 struct nfs4_state *state, fmode_t fmode, 2629 int openflags) 2630 { 2631 struct nfs_access_entry cache; 2632 u32 mask, flags; 2633 2634 /* access call failed or for some reason the server doesn't 2635 * support any access modes -- defer access call until later */ 2636 if (opendata->o_res.access_supported == 0) 2637 return 0; 2638 2639 mask = 0; 2640 /* 2641 * Use openflags to check for exec, because fmode won't 2642 * always have FMODE_EXEC set when file open for exec. 2643 */ 2644 if (openflags & __FMODE_EXEC) { 2645 /* ONLY check for exec rights */ 2646 if (S_ISDIR(state->inode->i_mode)) 2647 mask = NFS4_ACCESS_LOOKUP; 2648 else 2649 mask = NFS4_ACCESS_EXECUTE; 2650 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2651 mask = NFS4_ACCESS_READ; 2652 2653 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2654 nfs_access_add_cache(state->inode, &cache, cred); 2655 2656 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2657 if ((mask & ~cache.mask & flags) == 0) 2658 return 0; 2659 2660 return -EACCES; 2661 } 2662 2663 /* 2664 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2665 */ 2666 static int _nfs4_proc_open(struct nfs4_opendata *data, 2667 struct nfs_open_context *ctx) 2668 { 2669 struct inode *dir = d_inode(data->dir); 2670 struct nfs_server *server = NFS_SERVER(dir); 2671 struct nfs_openargs *o_arg = &data->o_arg; 2672 struct nfs_openres *o_res = &data->o_res; 2673 int status; 2674 2675 status = nfs4_run_open_task(data, ctx); 2676 if (!data->rpc_done) 2677 return status; 2678 if (status != 0) { 2679 if (status == -NFS4ERR_BADNAME && 2680 !(o_arg->open_flags & O_CREAT)) 2681 return -ENOENT; 2682 return status; 2683 } 2684 2685 nfs_fattr_map_and_free_names(server, &data->f_attr); 2686 2687 if (o_arg->open_flags & O_CREAT) { 2688 if (o_arg->open_flags & O_EXCL) 2689 data->file_created = true; 2690 else if (o_res->cinfo.before != o_res->cinfo.after) 2691 data->file_created = true; 2692 if (data->file_created || 2693 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2694 nfs4_update_changeattr(dir, &o_res->cinfo, 2695 o_res->f_attr->time_start, 2696 NFS_INO_INVALID_DATA); 2697 } 2698 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2699 server->caps &= ~NFS_CAP_POSIX_LOCK; 2700 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2701 status = _nfs4_proc_open_confirm(data); 2702 if (status != 0) 2703 return status; 2704 } 2705 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2706 nfs4_sequence_free_slot(&o_res->seq_res); 2707 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL); 2708 } 2709 return 0; 2710 } 2711 2712 /* 2713 * OPEN_EXPIRED: 2714 * reclaim state on the server after a network partition. 2715 * Assumes caller holds the appropriate lock 2716 */ 2717 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2718 { 2719 struct nfs4_opendata *opendata; 2720 int ret; 2721 2722 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2723 NFS4_OPEN_CLAIM_FH); 2724 if (IS_ERR(opendata)) 2725 return PTR_ERR(opendata); 2726 ret = nfs4_open_recover(opendata, state); 2727 if (ret == -ESTALE) 2728 d_drop(ctx->dentry); 2729 nfs4_opendata_put(opendata); 2730 return ret; 2731 } 2732 2733 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2734 { 2735 struct nfs_server *server = NFS_SERVER(state->inode); 2736 struct nfs4_exception exception = { }; 2737 int err; 2738 2739 do { 2740 err = _nfs4_open_expired(ctx, state); 2741 trace_nfs4_open_expired(ctx, 0, err); 2742 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2743 continue; 2744 switch (err) { 2745 default: 2746 goto out; 2747 case -NFS4ERR_GRACE: 2748 case -NFS4ERR_DELAY: 2749 nfs4_handle_exception(server, err, &exception); 2750 err = 0; 2751 } 2752 } while (exception.retry); 2753 out: 2754 return err; 2755 } 2756 2757 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2758 { 2759 struct nfs_open_context *ctx; 2760 int ret; 2761 2762 ctx = nfs4_state_find_open_context(state); 2763 if (IS_ERR(ctx)) 2764 return -EAGAIN; 2765 ret = nfs4_do_open_expired(ctx, state); 2766 put_nfs_open_context(ctx); 2767 return ret; 2768 } 2769 2770 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2771 const nfs4_stateid *stateid) 2772 { 2773 nfs_remove_bad_delegation(state->inode, stateid); 2774 nfs_state_clear_delegation(state); 2775 } 2776 2777 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2778 { 2779 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2780 nfs_finish_clear_delegation_stateid(state, NULL); 2781 } 2782 2783 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2784 { 2785 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2786 nfs40_clear_delegation_stateid(state); 2787 nfs_state_clear_open_state_flags(state); 2788 return nfs4_open_expired(sp, state); 2789 } 2790 2791 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2792 nfs4_stateid *stateid, 2793 const struct cred *cred) 2794 { 2795 return -NFS4ERR_BAD_STATEID; 2796 } 2797 2798 #if defined(CONFIG_NFS_V4_1) 2799 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2800 nfs4_stateid *stateid, 2801 const struct cred *cred) 2802 { 2803 int status; 2804 2805 switch (stateid->type) { 2806 default: 2807 break; 2808 case NFS4_INVALID_STATEID_TYPE: 2809 case NFS4_SPECIAL_STATEID_TYPE: 2810 return -NFS4ERR_BAD_STATEID; 2811 case NFS4_REVOKED_STATEID_TYPE: 2812 goto out_free; 2813 } 2814 2815 status = nfs41_test_stateid(server, stateid, cred); 2816 switch (status) { 2817 case -NFS4ERR_EXPIRED: 2818 case -NFS4ERR_ADMIN_REVOKED: 2819 case -NFS4ERR_DELEG_REVOKED: 2820 break; 2821 default: 2822 return status; 2823 } 2824 out_free: 2825 /* Ack the revoked state to the server */ 2826 nfs41_free_stateid(server, stateid, cred, true); 2827 return -NFS4ERR_EXPIRED; 2828 } 2829 2830 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2831 { 2832 struct nfs_server *server = NFS_SERVER(state->inode); 2833 nfs4_stateid stateid; 2834 struct nfs_delegation *delegation; 2835 const struct cred *cred = NULL; 2836 int status, ret = NFS_OK; 2837 2838 /* Get the delegation credential for use by test/free_stateid */ 2839 rcu_read_lock(); 2840 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2841 if (delegation == NULL) { 2842 rcu_read_unlock(); 2843 nfs_state_clear_delegation(state); 2844 return NFS_OK; 2845 } 2846 2847 spin_lock(&delegation->lock); 2848 nfs4_stateid_copy(&stateid, &delegation->stateid); 2849 2850 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2851 &delegation->flags)) { 2852 spin_unlock(&delegation->lock); 2853 rcu_read_unlock(); 2854 return NFS_OK; 2855 } 2856 2857 if (delegation->cred) 2858 cred = get_cred(delegation->cred); 2859 spin_unlock(&delegation->lock); 2860 rcu_read_unlock(); 2861 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2862 trace_nfs4_test_delegation_stateid(state, NULL, status); 2863 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2864 nfs_finish_clear_delegation_stateid(state, &stateid); 2865 else 2866 ret = status; 2867 2868 put_cred(cred); 2869 return ret; 2870 } 2871 2872 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2873 { 2874 nfs4_stateid tmp; 2875 2876 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2877 nfs4_copy_delegation_stateid(state->inode, state->state, 2878 &tmp, NULL) && 2879 nfs4_stateid_match_other(&state->stateid, &tmp)) 2880 nfs_state_set_delegation(state, &tmp, state->state); 2881 else 2882 nfs_state_clear_delegation(state); 2883 } 2884 2885 /** 2886 * nfs41_check_expired_locks - possibly free a lock stateid 2887 * 2888 * @state: NFSv4 state for an inode 2889 * 2890 * Returns NFS_OK if recovery for this stateid is now finished. 2891 * Otherwise a negative NFS4ERR value is returned. 2892 */ 2893 static int nfs41_check_expired_locks(struct nfs4_state *state) 2894 { 2895 int status, ret = NFS_OK; 2896 struct nfs4_lock_state *lsp, *prev = NULL; 2897 struct nfs_server *server = NFS_SERVER(state->inode); 2898 2899 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2900 goto out; 2901 2902 spin_lock(&state->state_lock); 2903 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2904 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2905 const struct cred *cred = lsp->ls_state->owner->so_cred; 2906 2907 refcount_inc(&lsp->ls_count); 2908 spin_unlock(&state->state_lock); 2909 2910 nfs4_put_lock_state(prev); 2911 prev = lsp; 2912 2913 status = nfs41_test_and_free_expired_stateid(server, 2914 &lsp->ls_stateid, 2915 cred); 2916 trace_nfs4_test_lock_stateid(state, lsp, status); 2917 if (status == -NFS4ERR_EXPIRED || 2918 status == -NFS4ERR_BAD_STATEID) { 2919 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2920 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2921 if (!recover_lost_locks) 2922 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2923 } else if (status != NFS_OK) { 2924 ret = status; 2925 nfs4_put_lock_state(prev); 2926 goto out; 2927 } 2928 spin_lock(&state->state_lock); 2929 } 2930 } 2931 spin_unlock(&state->state_lock); 2932 nfs4_put_lock_state(prev); 2933 out: 2934 return ret; 2935 } 2936 2937 /** 2938 * nfs41_check_open_stateid - possibly free an open stateid 2939 * 2940 * @state: NFSv4 state for an inode 2941 * 2942 * Returns NFS_OK if recovery for this stateid is now finished. 2943 * Otherwise a negative NFS4ERR value is returned. 2944 */ 2945 static int nfs41_check_open_stateid(struct nfs4_state *state) 2946 { 2947 struct nfs_server *server = NFS_SERVER(state->inode); 2948 nfs4_stateid *stateid = &state->open_stateid; 2949 const struct cred *cred = state->owner->so_cred; 2950 int status; 2951 2952 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2953 return -NFS4ERR_BAD_STATEID; 2954 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2955 trace_nfs4_test_open_stateid(state, NULL, status); 2956 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2957 nfs_state_clear_open_state_flags(state); 2958 stateid->type = NFS4_INVALID_STATEID_TYPE; 2959 return status; 2960 } 2961 if (nfs_open_stateid_recover_openmode(state)) 2962 return -NFS4ERR_OPENMODE; 2963 return NFS_OK; 2964 } 2965 2966 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2967 { 2968 int status; 2969 2970 status = nfs41_check_delegation_stateid(state); 2971 if (status != NFS_OK) 2972 return status; 2973 nfs41_delegation_recover_stateid(state); 2974 2975 status = nfs41_check_expired_locks(state); 2976 if (status != NFS_OK) 2977 return status; 2978 status = nfs41_check_open_stateid(state); 2979 if (status != NFS_OK) 2980 status = nfs4_open_expired(sp, state); 2981 return status; 2982 } 2983 #endif 2984 2985 /* 2986 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2987 * fields corresponding to attributes that were used to store the verifier. 2988 * Make sure we clobber those fields in the later setattr call 2989 */ 2990 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2991 struct iattr *sattr, struct nfs4_label **label) 2992 { 2993 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2994 __u32 attrset[3]; 2995 unsigned ret; 2996 unsigned i; 2997 2998 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 2999 attrset[i] = opendata->o_res.attrset[i]; 3000 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3001 attrset[i] &= ~bitmask[i]; 3002 } 3003 3004 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3005 sattr->ia_valid : 0; 3006 3007 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3008 if (sattr->ia_valid & ATTR_ATIME_SET) 3009 ret |= ATTR_ATIME_SET; 3010 else 3011 ret |= ATTR_ATIME; 3012 } 3013 3014 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3015 if (sattr->ia_valid & ATTR_MTIME_SET) 3016 ret |= ATTR_MTIME_SET; 3017 else 3018 ret |= ATTR_MTIME; 3019 } 3020 3021 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3022 *label = NULL; 3023 return ret; 3024 } 3025 3026 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3027 int flags, struct nfs_open_context *ctx) 3028 { 3029 struct nfs4_state_owner *sp = opendata->owner; 3030 struct nfs_server *server = sp->so_server; 3031 struct dentry *dentry; 3032 struct nfs4_state *state; 3033 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3034 struct inode *dir = d_inode(opendata->dir); 3035 unsigned long dir_verifier; 3036 unsigned int seq; 3037 int ret; 3038 3039 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3040 dir_verifier = nfs_save_change_attribute(dir); 3041 3042 ret = _nfs4_proc_open(opendata, ctx); 3043 if (ret != 0) 3044 goto out; 3045 3046 state = _nfs4_opendata_to_nfs4_state(opendata); 3047 ret = PTR_ERR(state); 3048 if (IS_ERR(state)) 3049 goto out; 3050 ctx->state = state; 3051 if (server->caps & NFS_CAP_POSIX_LOCK) 3052 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3053 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3054 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3055 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3056 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3057 3058 dentry = opendata->dentry; 3059 if (d_really_is_negative(dentry)) { 3060 struct dentry *alias; 3061 d_drop(dentry); 3062 alias = d_exact_alias(dentry, state->inode); 3063 if (!alias) 3064 alias = d_splice_alias(igrab(state->inode), dentry); 3065 /* d_splice_alias() can't fail here - it's a non-directory */ 3066 if (alias) { 3067 dput(ctx->dentry); 3068 ctx->dentry = dentry = alias; 3069 } 3070 } 3071 3072 switch(opendata->o_arg.claim) { 3073 default: 3074 break; 3075 case NFS4_OPEN_CLAIM_NULL: 3076 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3077 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3078 if (!opendata->rpc_done) 3079 break; 3080 if (opendata->o_res.delegation_type != 0) 3081 dir_verifier = nfs_save_change_attribute(dir); 3082 nfs_set_verifier(dentry, dir_verifier); 3083 } 3084 3085 /* Parse layoutget results before we check for access */ 3086 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3087 3088 ret = nfs4_opendata_access(sp->so_cred, opendata, state, 3089 acc_mode, flags); 3090 if (ret != 0) 3091 goto out; 3092 3093 if (d_inode(dentry) == state->inode) { 3094 nfs_inode_attach_open_context(ctx); 3095 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3096 nfs4_schedule_stateid_recovery(server, state); 3097 } 3098 3099 out: 3100 if (!opendata->cancelled) { 3101 if (opendata->lgp) { 3102 nfs4_lgopen_release(opendata->lgp); 3103 opendata->lgp = NULL; 3104 } 3105 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3106 } 3107 return ret; 3108 } 3109 3110 /* 3111 * Returns a referenced nfs4_state 3112 */ 3113 static int _nfs4_do_open(struct inode *dir, 3114 struct nfs_open_context *ctx, 3115 int flags, 3116 const struct nfs4_open_createattrs *c, 3117 int *opened) 3118 { 3119 struct nfs4_state_owner *sp; 3120 struct nfs4_state *state = NULL; 3121 struct nfs_server *server = NFS_SERVER(dir); 3122 struct nfs4_opendata *opendata; 3123 struct dentry *dentry = ctx->dentry; 3124 const struct cred *cred = ctx->cred; 3125 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3126 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3127 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3128 struct iattr *sattr = c->sattr; 3129 struct nfs4_label *label = c->label; 3130 int status; 3131 3132 /* Protect against reboot recovery conflicts */ 3133 status = -ENOMEM; 3134 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3135 if (sp == NULL) { 3136 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3137 goto out_err; 3138 } 3139 status = nfs4_client_recover_expired_lease(server->nfs_client); 3140 if (status != 0) 3141 goto err_put_state_owner; 3142 if (d_really_is_positive(dentry)) 3143 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3144 status = -ENOMEM; 3145 if (d_really_is_positive(dentry)) 3146 claim = NFS4_OPEN_CLAIM_FH; 3147 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3148 c, claim, GFP_KERNEL); 3149 if (opendata == NULL) 3150 goto err_put_state_owner; 3151 3152 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3153 if (!opendata->f_attr.mdsthreshold) { 3154 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3155 if (!opendata->f_attr.mdsthreshold) 3156 goto err_opendata_put; 3157 } 3158 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3159 } 3160 if (d_really_is_positive(dentry)) 3161 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3162 3163 status = _nfs4_open_and_get_state(opendata, flags, ctx); 3164 if (status != 0) 3165 goto err_opendata_put; 3166 state = ctx->state; 3167 3168 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3169 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3170 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3171 /* 3172 * send create attributes which was not set by open 3173 * with an extra setattr. 3174 */ 3175 if (attrs || label) { 3176 unsigned ia_old = sattr->ia_valid; 3177 3178 sattr->ia_valid = attrs; 3179 nfs_fattr_init(opendata->o_res.f_attr); 3180 status = nfs4_do_setattr(state->inode, cred, 3181 opendata->o_res.f_attr, sattr, 3182 ctx, label); 3183 if (status == 0) { 3184 nfs_setattr_update_inode(state->inode, sattr, 3185 opendata->o_res.f_attr); 3186 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3187 } 3188 sattr->ia_valid = ia_old; 3189 } 3190 } 3191 if (opened && opendata->file_created) 3192 *opened = 1; 3193 3194 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3195 *ctx_th = opendata->f_attr.mdsthreshold; 3196 opendata->f_attr.mdsthreshold = NULL; 3197 } 3198 3199 nfs4_opendata_put(opendata); 3200 nfs4_put_state_owner(sp); 3201 return 0; 3202 err_opendata_put: 3203 nfs4_opendata_put(opendata); 3204 err_put_state_owner: 3205 nfs4_put_state_owner(sp); 3206 out_err: 3207 return status; 3208 } 3209 3210 3211 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3212 struct nfs_open_context *ctx, 3213 int flags, 3214 struct iattr *sattr, 3215 struct nfs4_label *label, 3216 int *opened) 3217 { 3218 struct nfs_server *server = NFS_SERVER(dir); 3219 struct nfs4_exception exception = { 3220 .interruptible = true, 3221 }; 3222 struct nfs4_state *res; 3223 struct nfs4_open_createattrs c = { 3224 .label = label, 3225 .sattr = sattr, 3226 .verf = { 3227 [0] = (__u32)jiffies, 3228 [1] = (__u32)current->pid, 3229 }, 3230 }; 3231 int status; 3232 3233 do { 3234 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3235 res = ctx->state; 3236 trace_nfs4_open_file(ctx, flags, status); 3237 if (status == 0) 3238 break; 3239 /* NOTE: BAD_SEQID means the server and client disagree about the 3240 * book-keeping w.r.t. state-changing operations 3241 * (OPEN/CLOSE/LOCK/LOCKU...) 3242 * It is actually a sign of a bug on the client or on the server. 3243 * 3244 * If we receive a BAD_SEQID error in the particular case of 3245 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3246 * have unhashed the old state_owner for us, and that we can 3247 * therefore safely retry using a new one. We should still warn 3248 * the user though... 3249 */ 3250 if (status == -NFS4ERR_BAD_SEQID) { 3251 pr_warn_ratelimited("NFS: v4 server %s " 3252 " returned a bad sequence-id error!\n", 3253 NFS_SERVER(dir)->nfs_client->cl_hostname); 3254 exception.retry = 1; 3255 continue; 3256 } 3257 /* 3258 * BAD_STATEID on OPEN means that the server cancelled our 3259 * state before it received the OPEN_CONFIRM. 3260 * Recover by retrying the request as per the discussion 3261 * on Page 181 of RFC3530. 3262 */ 3263 if (status == -NFS4ERR_BAD_STATEID) { 3264 exception.retry = 1; 3265 continue; 3266 } 3267 if (status == -NFS4ERR_EXPIRED) { 3268 nfs4_schedule_lease_recovery(server->nfs_client); 3269 exception.retry = 1; 3270 continue; 3271 } 3272 if (status == -EAGAIN) { 3273 /* We must have found a delegation */ 3274 exception.retry = 1; 3275 continue; 3276 } 3277 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3278 continue; 3279 res = ERR_PTR(nfs4_handle_exception(server, 3280 status, &exception)); 3281 } while (exception.retry); 3282 return res; 3283 } 3284 3285 static int _nfs4_do_setattr(struct inode *inode, 3286 struct nfs_setattrargs *arg, 3287 struct nfs_setattrres *res, 3288 const struct cred *cred, 3289 struct nfs_open_context *ctx) 3290 { 3291 struct nfs_server *server = NFS_SERVER(inode); 3292 struct rpc_message msg = { 3293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3294 .rpc_argp = arg, 3295 .rpc_resp = res, 3296 .rpc_cred = cred, 3297 }; 3298 const struct cred *delegation_cred = NULL; 3299 unsigned long timestamp = jiffies; 3300 bool truncate; 3301 int status; 3302 3303 nfs_fattr_init(res->fattr); 3304 3305 /* Servers should only apply open mode checks for file size changes */ 3306 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3307 if (!truncate) { 3308 nfs4_inode_make_writeable(inode); 3309 goto zero_stateid; 3310 } 3311 3312 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3313 /* Use that stateid */ 3314 } else if (ctx != NULL && ctx->state) { 3315 struct nfs_lock_context *l_ctx; 3316 if (!nfs4_valid_open_stateid(ctx->state)) 3317 return -EBADF; 3318 l_ctx = nfs_get_lock_context(ctx); 3319 if (IS_ERR(l_ctx)) 3320 return PTR_ERR(l_ctx); 3321 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3322 &arg->stateid, &delegation_cred); 3323 nfs_put_lock_context(l_ctx); 3324 if (status == -EIO) 3325 return -EBADF; 3326 else if (status == -EAGAIN) 3327 goto zero_stateid; 3328 } else { 3329 zero_stateid: 3330 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3331 } 3332 if (delegation_cred) 3333 msg.rpc_cred = delegation_cred; 3334 3335 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3336 3337 put_cred(delegation_cred); 3338 if (status == 0 && ctx != NULL) 3339 renew_lease(server, timestamp); 3340 trace_nfs4_setattr(inode, &arg->stateid, status); 3341 return status; 3342 } 3343 3344 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3345 struct nfs_fattr *fattr, struct iattr *sattr, 3346 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3347 { 3348 struct nfs_server *server = NFS_SERVER(inode); 3349 __u32 bitmask[NFS4_BITMASK_SZ]; 3350 struct nfs4_state *state = ctx ? ctx->state : NULL; 3351 struct nfs_setattrargs arg = { 3352 .fh = NFS_FH(inode), 3353 .iap = sattr, 3354 .server = server, 3355 .bitmask = bitmask, 3356 .label = ilabel, 3357 }; 3358 struct nfs_setattrres res = { 3359 .fattr = fattr, 3360 .server = server, 3361 }; 3362 struct nfs4_exception exception = { 3363 .state = state, 3364 .inode = inode, 3365 .stateid = &arg.stateid, 3366 }; 3367 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3368 int err; 3369 3370 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3371 adjust_flags |= NFS_INO_INVALID_MODE; 3372 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3373 adjust_flags |= NFS_INO_INVALID_OTHER; 3374 3375 do { 3376 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3377 inode, adjust_flags); 3378 3379 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3380 switch (err) { 3381 case -NFS4ERR_OPENMODE: 3382 if (!(sattr->ia_valid & ATTR_SIZE)) { 3383 pr_warn_once("NFSv4: server %s is incorrectly " 3384 "applying open mode checks to " 3385 "a SETATTR that is not " 3386 "changing file size.\n", 3387 server->nfs_client->cl_hostname); 3388 } 3389 if (state && !(state->state & FMODE_WRITE)) { 3390 err = -EBADF; 3391 if (sattr->ia_valid & ATTR_OPEN) 3392 err = -EACCES; 3393 goto out; 3394 } 3395 } 3396 err = nfs4_handle_exception(server, err, &exception); 3397 } while (exception.retry); 3398 out: 3399 return err; 3400 } 3401 3402 static bool 3403 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3404 { 3405 if (inode == NULL || !nfs_have_layout(inode)) 3406 return false; 3407 3408 return pnfs_wait_on_layoutreturn(inode, task); 3409 } 3410 3411 /* 3412 * Update the seqid of an open stateid 3413 */ 3414 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3415 struct nfs4_state *state) 3416 { 3417 __be32 seqid_open; 3418 u32 dst_seqid; 3419 int seq; 3420 3421 for (;;) { 3422 if (!nfs4_valid_open_stateid(state)) 3423 break; 3424 seq = read_seqbegin(&state->seqlock); 3425 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3426 nfs4_stateid_copy(dst, &state->open_stateid); 3427 if (read_seqretry(&state->seqlock, seq)) 3428 continue; 3429 break; 3430 } 3431 seqid_open = state->open_stateid.seqid; 3432 if (read_seqretry(&state->seqlock, seq)) 3433 continue; 3434 3435 dst_seqid = be32_to_cpu(dst->seqid); 3436 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3437 dst->seqid = seqid_open; 3438 break; 3439 } 3440 } 3441 3442 /* 3443 * Update the seqid of an open stateid after receiving 3444 * NFS4ERR_OLD_STATEID 3445 */ 3446 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3447 struct nfs4_state *state) 3448 { 3449 __be32 seqid_open; 3450 u32 dst_seqid; 3451 bool ret; 3452 int seq, status = -EAGAIN; 3453 DEFINE_WAIT(wait); 3454 3455 for (;;) { 3456 ret = false; 3457 if (!nfs4_valid_open_stateid(state)) 3458 break; 3459 seq = read_seqbegin(&state->seqlock); 3460 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3461 if (read_seqretry(&state->seqlock, seq)) 3462 continue; 3463 break; 3464 } 3465 3466 write_seqlock(&state->seqlock); 3467 seqid_open = state->open_stateid.seqid; 3468 3469 dst_seqid = be32_to_cpu(dst->seqid); 3470 3471 /* Did another OPEN bump the state's seqid? try again: */ 3472 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3473 dst->seqid = seqid_open; 3474 write_sequnlock(&state->seqlock); 3475 ret = true; 3476 break; 3477 } 3478 3479 /* server says we're behind but we haven't seen the update yet */ 3480 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3481 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3482 write_sequnlock(&state->seqlock); 3483 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3484 3485 if (fatal_signal_pending(current)) 3486 status = -EINTR; 3487 else 3488 if (schedule_timeout(5*HZ) != 0) 3489 status = 0; 3490 3491 finish_wait(&state->waitq, &wait); 3492 3493 if (!status) 3494 continue; 3495 if (status == -EINTR) 3496 break; 3497 3498 /* we slept the whole 5 seconds, we must have lost a seqid */ 3499 dst->seqid = cpu_to_be32(dst_seqid + 1); 3500 ret = true; 3501 break; 3502 } 3503 3504 return ret; 3505 } 3506 3507 struct nfs4_closedata { 3508 struct inode *inode; 3509 struct nfs4_state *state; 3510 struct nfs_closeargs arg; 3511 struct nfs_closeres res; 3512 struct { 3513 struct nfs4_layoutreturn_args arg; 3514 struct nfs4_layoutreturn_res res; 3515 struct nfs4_xdr_opaque_data ld_private; 3516 u32 roc_barrier; 3517 bool roc; 3518 } lr; 3519 struct nfs_fattr fattr; 3520 unsigned long timestamp; 3521 }; 3522 3523 static void nfs4_free_closedata(void *data) 3524 { 3525 struct nfs4_closedata *calldata = data; 3526 struct nfs4_state_owner *sp = calldata->state->owner; 3527 struct super_block *sb = calldata->state->inode->i_sb; 3528 3529 if (calldata->lr.roc) 3530 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3531 calldata->res.lr_ret); 3532 nfs4_put_open_state(calldata->state); 3533 nfs_free_seqid(calldata->arg.seqid); 3534 nfs4_put_state_owner(sp); 3535 nfs_sb_deactive(sb); 3536 kfree(calldata); 3537 } 3538 3539 static void nfs4_close_done(struct rpc_task *task, void *data) 3540 { 3541 struct nfs4_closedata *calldata = data; 3542 struct nfs4_state *state = calldata->state; 3543 struct nfs_server *server = NFS_SERVER(calldata->inode); 3544 nfs4_stateid *res_stateid = NULL; 3545 struct nfs4_exception exception = { 3546 .state = state, 3547 .inode = calldata->inode, 3548 .stateid = &calldata->arg.stateid, 3549 }; 3550 3551 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3552 return; 3553 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3554 3555 /* Handle Layoutreturn errors */ 3556 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3557 &calldata->res.lr_ret) == -EAGAIN) 3558 goto out_restart; 3559 3560 /* hmm. we are done with the inode, and in the process of freeing 3561 * the state_owner. we keep this around to process errors 3562 */ 3563 switch (task->tk_status) { 3564 case 0: 3565 res_stateid = &calldata->res.stateid; 3566 renew_lease(server, calldata->timestamp); 3567 break; 3568 case -NFS4ERR_ACCESS: 3569 if (calldata->arg.bitmask != NULL) { 3570 calldata->arg.bitmask = NULL; 3571 calldata->res.fattr = NULL; 3572 goto out_restart; 3573 3574 } 3575 break; 3576 case -NFS4ERR_OLD_STATEID: 3577 /* Did we race with OPEN? */ 3578 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3579 state)) 3580 goto out_restart; 3581 goto out_release; 3582 case -NFS4ERR_ADMIN_REVOKED: 3583 case -NFS4ERR_STALE_STATEID: 3584 case -NFS4ERR_EXPIRED: 3585 nfs4_free_revoked_stateid(server, 3586 &calldata->arg.stateid, 3587 task->tk_msg.rpc_cred); 3588 fallthrough; 3589 case -NFS4ERR_BAD_STATEID: 3590 if (calldata->arg.fmode == 0) 3591 break; 3592 fallthrough; 3593 default: 3594 task->tk_status = nfs4_async_handle_exception(task, 3595 server, task->tk_status, &exception); 3596 if (exception.retry) 3597 goto out_restart; 3598 } 3599 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3600 res_stateid, calldata->arg.fmode); 3601 out_release: 3602 task->tk_status = 0; 3603 nfs_release_seqid(calldata->arg.seqid); 3604 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3605 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3606 return; 3607 out_restart: 3608 task->tk_status = 0; 3609 rpc_restart_call_prepare(task); 3610 goto out_release; 3611 } 3612 3613 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3614 { 3615 struct nfs4_closedata *calldata = data; 3616 struct nfs4_state *state = calldata->state; 3617 struct inode *inode = calldata->inode; 3618 struct nfs_server *server = NFS_SERVER(inode); 3619 struct pnfs_layout_hdr *lo; 3620 bool is_rdonly, is_wronly, is_rdwr; 3621 int call_close = 0; 3622 3623 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3624 goto out_wait; 3625 3626 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3627 spin_lock(&state->owner->so_lock); 3628 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3629 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3630 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3631 /* Calculate the change in open mode */ 3632 calldata->arg.fmode = 0; 3633 if (state->n_rdwr == 0) { 3634 if (state->n_rdonly == 0) 3635 call_close |= is_rdonly; 3636 else if (is_rdonly) 3637 calldata->arg.fmode |= FMODE_READ; 3638 if (state->n_wronly == 0) 3639 call_close |= is_wronly; 3640 else if (is_wronly) 3641 calldata->arg.fmode |= FMODE_WRITE; 3642 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3643 call_close |= is_rdwr; 3644 } else if (is_rdwr) 3645 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3646 3647 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3648 if (!nfs4_valid_open_stateid(state)) 3649 call_close = 0; 3650 spin_unlock(&state->owner->so_lock); 3651 3652 if (!call_close) { 3653 /* Note: exit _without_ calling nfs4_close_done */ 3654 goto out_no_action; 3655 } 3656 3657 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3658 nfs_release_seqid(calldata->arg.seqid); 3659 goto out_wait; 3660 } 3661 3662 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3663 if (lo && !pnfs_layout_is_valid(lo)) { 3664 calldata->arg.lr_args = NULL; 3665 calldata->res.lr_res = NULL; 3666 } 3667 3668 if (calldata->arg.fmode == 0) 3669 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3670 3671 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3672 /* Close-to-open cache consistency revalidation */ 3673 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3674 nfs4_bitmask_set(calldata->arg.bitmask_store, 3675 server->cache_consistency_bitmask, 3676 inode, 0); 3677 calldata->arg.bitmask = calldata->arg.bitmask_store; 3678 } else 3679 calldata->arg.bitmask = NULL; 3680 } 3681 3682 calldata->arg.share_access = 3683 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3684 calldata->arg.fmode, 0); 3685 3686 if (calldata->res.fattr == NULL) 3687 calldata->arg.bitmask = NULL; 3688 else if (calldata->arg.bitmask == NULL) 3689 calldata->res.fattr = NULL; 3690 calldata->timestamp = jiffies; 3691 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3692 &calldata->arg.seq_args, 3693 &calldata->res.seq_res, 3694 task) != 0) 3695 nfs_release_seqid(calldata->arg.seqid); 3696 return; 3697 out_no_action: 3698 task->tk_action = NULL; 3699 out_wait: 3700 nfs4_sequence_done(task, &calldata->res.seq_res); 3701 } 3702 3703 static const struct rpc_call_ops nfs4_close_ops = { 3704 .rpc_call_prepare = nfs4_close_prepare, 3705 .rpc_call_done = nfs4_close_done, 3706 .rpc_release = nfs4_free_closedata, 3707 }; 3708 3709 /* 3710 * It is possible for data to be read/written from a mem-mapped file 3711 * after the sys_close call (which hits the vfs layer as a flush). 3712 * This means that we can't safely call nfsv4 close on a file until 3713 * the inode is cleared. This in turn means that we are not good 3714 * NFSv4 citizens - we do not indicate to the server to update the file's 3715 * share state even when we are done with one of the three share 3716 * stateid's in the inode. 3717 * 3718 * NOTE: Caller must be holding the sp->so_owner semaphore! 3719 */ 3720 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3721 { 3722 struct nfs_server *server = NFS_SERVER(state->inode); 3723 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3724 struct nfs4_closedata *calldata; 3725 struct nfs4_state_owner *sp = state->owner; 3726 struct rpc_task *task; 3727 struct rpc_message msg = { 3728 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3729 .rpc_cred = state->owner->so_cred, 3730 }; 3731 struct rpc_task_setup task_setup_data = { 3732 .rpc_client = server->client, 3733 .rpc_message = &msg, 3734 .callback_ops = &nfs4_close_ops, 3735 .workqueue = nfsiod_workqueue, 3736 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3737 }; 3738 int status = -ENOMEM; 3739 3740 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3741 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3742 3743 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3744 &task_setup_data.rpc_client, &msg); 3745 3746 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3747 if (calldata == NULL) 3748 goto out; 3749 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3750 calldata->inode = state->inode; 3751 calldata->state = state; 3752 calldata->arg.fh = NFS_FH(state->inode); 3753 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3754 goto out_free_calldata; 3755 /* Serialization for the sequence id */ 3756 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3757 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3758 if (IS_ERR(calldata->arg.seqid)) 3759 goto out_free_calldata; 3760 nfs_fattr_init(&calldata->fattr); 3761 calldata->arg.fmode = 0; 3762 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3763 calldata->res.fattr = &calldata->fattr; 3764 calldata->res.seqid = calldata->arg.seqid; 3765 calldata->res.server = server; 3766 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3767 calldata->lr.roc = pnfs_roc(state->inode, 3768 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3769 if (calldata->lr.roc) { 3770 calldata->arg.lr_args = &calldata->lr.arg; 3771 calldata->res.lr_res = &calldata->lr.res; 3772 } 3773 nfs_sb_active(calldata->inode->i_sb); 3774 3775 msg.rpc_argp = &calldata->arg; 3776 msg.rpc_resp = &calldata->res; 3777 task_setup_data.callback_data = calldata; 3778 task = rpc_run_task(&task_setup_data); 3779 if (IS_ERR(task)) 3780 return PTR_ERR(task); 3781 status = 0; 3782 if (wait) 3783 status = rpc_wait_for_completion_task(task); 3784 rpc_put_task(task); 3785 return status; 3786 out_free_calldata: 3787 kfree(calldata); 3788 out: 3789 nfs4_put_open_state(state); 3790 nfs4_put_state_owner(sp); 3791 return status; 3792 } 3793 3794 static struct inode * 3795 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3796 int open_flags, struct iattr *attr, int *opened) 3797 { 3798 struct nfs4_state *state; 3799 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3800 3801 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3802 3803 /* Protect against concurrent sillydeletes */ 3804 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3805 3806 nfs4_label_release_security(label); 3807 3808 if (IS_ERR(state)) 3809 return ERR_CAST(state); 3810 return state->inode; 3811 } 3812 3813 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3814 { 3815 if (ctx->state == NULL) 3816 return; 3817 if (is_sync) 3818 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3819 else 3820 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3821 } 3822 3823 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3824 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3825 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3826 3827 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3828 { 3829 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3830 struct nfs4_server_caps_arg args = { 3831 .fhandle = fhandle, 3832 .bitmask = bitmask, 3833 }; 3834 struct nfs4_server_caps_res res = {}; 3835 struct rpc_message msg = { 3836 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3837 .rpc_argp = &args, 3838 .rpc_resp = &res, 3839 }; 3840 int status; 3841 int i; 3842 3843 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3844 FATTR4_WORD0_FH_EXPIRE_TYPE | 3845 FATTR4_WORD0_LINK_SUPPORT | 3846 FATTR4_WORD0_SYMLINK_SUPPORT | 3847 FATTR4_WORD0_ACLSUPPORT | 3848 FATTR4_WORD0_CASE_INSENSITIVE | 3849 FATTR4_WORD0_CASE_PRESERVING; 3850 if (minorversion) 3851 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3852 3853 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3854 if (status == 0) { 3855 /* Sanity check the server answers */ 3856 switch (minorversion) { 3857 case 0: 3858 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3859 res.attr_bitmask[2] = 0; 3860 break; 3861 case 1: 3862 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3863 break; 3864 case 2: 3865 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3866 } 3867 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3868 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3869 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3870 server->fattr_valid = NFS_ATTR_FATTR_V4; 3871 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3872 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3873 server->caps |= NFS_CAP_ACLS; 3874 if (res.has_links != 0) 3875 server->caps |= NFS_CAP_HARDLINKS; 3876 if (res.has_symlinks != 0) 3877 server->caps |= NFS_CAP_SYMLINKS; 3878 if (res.case_insensitive) 3879 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3880 if (res.case_preserving) 3881 server->caps |= NFS_CAP_CASE_PRESERVING; 3882 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3883 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3884 server->caps |= NFS_CAP_SECURITY_LABEL; 3885 #endif 3886 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3887 server->caps |= NFS_CAP_FS_LOCATIONS; 3888 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3889 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3890 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3891 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3892 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3893 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3894 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3895 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3896 NFS_ATTR_FATTR_OWNER_NAME); 3897 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3898 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3899 NFS_ATTR_FATTR_GROUP_NAME); 3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3901 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3902 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3903 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3905 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3906 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3907 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3908 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3909 sizeof(server->attr_bitmask)); 3910 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3911 3912 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3913 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3914 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3915 server->cache_consistency_bitmask[2] = 0; 3916 3917 /* Avoid a regression due to buggy server */ 3918 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3919 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3920 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3921 sizeof(server->exclcreat_bitmask)); 3922 3923 server->acl_bitmask = res.acl_bitmask; 3924 server->fh_expire_type = res.fh_expire_type; 3925 } 3926 3927 return status; 3928 } 3929 3930 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3931 { 3932 struct nfs4_exception exception = { 3933 .interruptible = true, 3934 }; 3935 int err; 3936 3937 nfs4_server_set_init_caps(server); 3938 do { 3939 err = nfs4_handle_exception(server, 3940 _nfs4_server_capabilities(server, fhandle), 3941 &exception); 3942 } while (exception.retry); 3943 return err; 3944 } 3945 3946 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3947 struct nfs_client *clp, 3948 struct nfs_server *server) 3949 { 3950 int i; 3951 3952 for (i = 0; i < location->nservers; i++) { 3953 struct nfs4_string *srv_loc = &location->servers[i]; 3954 struct sockaddr_storage addr; 3955 size_t addrlen; 3956 struct xprt_create xprt_args = { 3957 .ident = 0, 3958 .net = clp->cl_net, 3959 }; 3960 struct nfs4_add_xprt_data xprtdata = { 3961 .clp = clp, 3962 }; 3963 struct rpc_add_xprt_test rpcdata = { 3964 .add_xprt_test = clp->cl_mvops->session_trunk, 3965 .data = &xprtdata, 3966 }; 3967 char *servername = NULL; 3968 3969 if (!srv_loc->len) 3970 continue; 3971 3972 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3973 &addr, sizeof(addr), 3974 clp->cl_net, server->port); 3975 if (!addrlen) 3976 return; 3977 xprt_args.dstaddr = (struct sockaddr *)&addr; 3978 xprt_args.addrlen = addrlen; 3979 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3980 if (!servername) 3981 return; 3982 memcpy(servername, srv_loc->data, srv_loc->len); 3983 servername[srv_loc->len] = '\0'; 3984 xprt_args.servername = servername; 3985 3986 xprtdata.cred = nfs4_get_clid_cred(clp); 3987 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3988 rpc_clnt_setup_test_and_add_xprt, 3989 &rpcdata); 3990 if (xprtdata.cred) 3991 put_cred(xprtdata.cred); 3992 kfree(servername); 3993 } 3994 } 3995 3996 static int _nfs4_discover_trunking(struct nfs_server *server, 3997 struct nfs_fh *fhandle) 3998 { 3999 struct nfs4_fs_locations *locations = NULL; 4000 struct page *page; 4001 const struct cred *cred; 4002 struct nfs_client *clp = server->nfs_client; 4003 const struct nfs4_state_maintenance_ops *ops = 4004 clp->cl_mvops->state_renewal_ops; 4005 int status = -ENOMEM, i; 4006 4007 cred = ops->get_state_renewal_cred(clp); 4008 if (cred == NULL) { 4009 cred = nfs4_get_clid_cred(clp); 4010 if (cred == NULL) 4011 return -ENOKEY; 4012 } 4013 4014 page = alloc_page(GFP_KERNEL); 4015 if (!page) 4016 return -ENOMEM; 4017 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4018 if (!locations) 4019 goto out_free; 4020 locations->fattr = nfs_alloc_fattr(); 4021 if (!locations->fattr) 4022 goto out_free_2; 4023 4024 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4025 cred); 4026 if (status) 4027 goto out_free_3; 4028 4029 for (i = 0; i < locations->nlocations; i++) 4030 test_fs_location_for_trunking(&locations->locations[i], clp, 4031 server); 4032 out_free_3: 4033 kfree(locations->fattr); 4034 out_free_2: 4035 kfree(locations); 4036 out_free: 4037 __free_page(page); 4038 return status; 4039 } 4040 4041 static int nfs4_discover_trunking(struct nfs_server *server, 4042 struct nfs_fh *fhandle) 4043 { 4044 struct nfs4_exception exception = { 4045 .interruptible = true, 4046 }; 4047 struct nfs_client *clp = server->nfs_client; 4048 int err = 0; 4049 4050 if (!nfs4_has_session(clp)) 4051 goto out; 4052 do { 4053 err = nfs4_handle_exception(server, 4054 _nfs4_discover_trunking(server, fhandle), 4055 &exception); 4056 } while (exception.retry); 4057 out: 4058 return err; 4059 } 4060 4061 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4062 struct nfs_fsinfo *info) 4063 { 4064 u32 bitmask[3]; 4065 struct nfs4_lookup_root_arg args = { 4066 .bitmask = bitmask, 4067 }; 4068 struct nfs4_lookup_res res = { 4069 .server = server, 4070 .fattr = info->fattr, 4071 .fh = fhandle, 4072 }; 4073 struct rpc_message msg = { 4074 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4075 .rpc_argp = &args, 4076 .rpc_resp = &res, 4077 }; 4078 4079 bitmask[0] = nfs4_fattr_bitmap[0]; 4080 bitmask[1] = nfs4_fattr_bitmap[1]; 4081 /* 4082 * Process the label in the upcoming getfattr 4083 */ 4084 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4085 4086 nfs_fattr_init(info->fattr); 4087 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4088 } 4089 4090 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4091 struct nfs_fsinfo *info) 4092 { 4093 struct nfs4_exception exception = { 4094 .interruptible = true, 4095 }; 4096 int err; 4097 do { 4098 err = _nfs4_lookup_root(server, fhandle, info); 4099 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4100 switch (err) { 4101 case 0: 4102 case -NFS4ERR_WRONGSEC: 4103 goto out; 4104 default: 4105 err = nfs4_handle_exception(server, err, &exception); 4106 } 4107 } while (exception.retry); 4108 out: 4109 return err; 4110 } 4111 4112 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4113 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4114 { 4115 struct rpc_auth_create_args auth_args = { 4116 .pseudoflavor = flavor, 4117 }; 4118 struct rpc_auth *auth; 4119 4120 auth = rpcauth_create(&auth_args, server->client); 4121 if (IS_ERR(auth)) 4122 return -EACCES; 4123 return nfs4_lookup_root(server, fhandle, info); 4124 } 4125 4126 /* 4127 * Retry pseudoroot lookup with various security flavors. We do this when: 4128 * 4129 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4130 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4131 * 4132 * Returns zero on success, or a negative NFS4ERR value, or a 4133 * negative errno value. 4134 */ 4135 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4136 struct nfs_fsinfo *info) 4137 { 4138 /* Per 3530bis 15.33.5 */ 4139 static const rpc_authflavor_t flav_array[] = { 4140 RPC_AUTH_GSS_KRB5P, 4141 RPC_AUTH_GSS_KRB5I, 4142 RPC_AUTH_GSS_KRB5, 4143 RPC_AUTH_UNIX, /* courtesy */ 4144 RPC_AUTH_NULL, 4145 }; 4146 int status = -EPERM; 4147 size_t i; 4148 4149 if (server->auth_info.flavor_len > 0) { 4150 /* try each flavor specified by user */ 4151 for (i = 0; i < server->auth_info.flavor_len; i++) { 4152 status = nfs4_lookup_root_sec(server, fhandle, info, 4153 server->auth_info.flavors[i]); 4154 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4155 continue; 4156 break; 4157 } 4158 } else { 4159 /* no flavors specified by user, try default list */ 4160 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4161 status = nfs4_lookup_root_sec(server, fhandle, info, 4162 flav_array[i]); 4163 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4164 continue; 4165 break; 4166 } 4167 } 4168 4169 /* 4170 * -EACCES could mean that the user doesn't have correct permissions 4171 * to access the mount. It could also mean that we tried to mount 4172 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4173 * existing mount programs don't handle -EACCES very well so it should 4174 * be mapped to -EPERM instead. 4175 */ 4176 if (status == -EACCES) 4177 status = -EPERM; 4178 return status; 4179 } 4180 4181 /** 4182 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4183 * @server: initialized nfs_server handle 4184 * @fhandle: we fill in the pseudo-fs root file handle 4185 * @info: we fill in an FSINFO struct 4186 * @auth_probe: probe the auth flavours 4187 * 4188 * Returns zero on success, or a negative errno. 4189 */ 4190 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4191 struct nfs_fsinfo *info, 4192 bool auth_probe) 4193 { 4194 int status = 0; 4195 4196 if (!auth_probe) 4197 status = nfs4_lookup_root(server, fhandle, info); 4198 4199 if (auth_probe || status == NFS4ERR_WRONGSEC) 4200 status = server->nfs_client->cl_mvops->find_root_sec(server, 4201 fhandle, info); 4202 4203 if (status == 0) 4204 status = nfs4_server_capabilities(server, fhandle); 4205 if (status == 0) 4206 status = nfs4_do_fsinfo(server, fhandle, info); 4207 4208 return nfs4_map_errors(status); 4209 } 4210 4211 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4212 struct nfs_fsinfo *info) 4213 { 4214 int error; 4215 struct nfs_fattr *fattr = info->fattr; 4216 4217 error = nfs4_server_capabilities(server, mntfh); 4218 if (error < 0) { 4219 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4220 return error; 4221 } 4222 4223 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4224 if (error < 0) { 4225 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4226 goto out; 4227 } 4228 4229 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4230 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4231 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4232 4233 out: 4234 return error; 4235 } 4236 4237 /* 4238 * Get locations and (maybe) other attributes of a referral. 4239 * Note that we'll actually follow the referral later when 4240 * we detect fsid mismatch in inode revalidation 4241 */ 4242 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4243 const struct qstr *name, struct nfs_fattr *fattr, 4244 struct nfs_fh *fhandle) 4245 { 4246 int status = -ENOMEM; 4247 struct page *page = NULL; 4248 struct nfs4_fs_locations *locations = NULL; 4249 4250 page = alloc_page(GFP_KERNEL); 4251 if (page == NULL) 4252 goto out; 4253 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4254 if (locations == NULL) 4255 goto out; 4256 4257 locations->fattr = fattr; 4258 4259 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4260 if (status != 0) 4261 goto out; 4262 4263 /* 4264 * If the fsid didn't change, this is a migration event, not a 4265 * referral. Cause us to drop into the exception handler, which 4266 * will kick off migration recovery. 4267 */ 4268 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4269 dprintk("%s: server did not return a different fsid for" 4270 " a referral at %s\n", __func__, name->name); 4271 status = -NFS4ERR_MOVED; 4272 goto out; 4273 } 4274 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4275 nfs_fixup_referral_attributes(fattr); 4276 memset(fhandle, 0, sizeof(struct nfs_fh)); 4277 out: 4278 if (page) 4279 __free_page(page); 4280 kfree(locations); 4281 return status; 4282 } 4283 4284 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4285 struct nfs_fattr *fattr, struct inode *inode) 4286 { 4287 __u32 bitmask[NFS4_BITMASK_SZ]; 4288 struct nfs4_getattr_arg args = { 4289 .fh = fhandle, 4290 .bitmask = bitmask, 4291 }; 4292 struct nfs4_getattr_res res = { 4293 .fattr = fattr, 4294 .server = server, 4295 }; 4296 struct rpc_message msg = { 4297 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4298 .rpc_argp = &args, 4299 .rpc_resp = &res, 4300 }; 4301 unsigned short task_flags = 0; 4302 4303 if (nfs4_has_session(server->nfs_client)) 4304 task_flags = RPC_TASK_MOVEABLE; 4305 4306 /* Is this is an attribute revalidation, subject to softreval? */ 4307 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4308 task_flags |= RPC_TASK_TIMEOUT; 4309 4310 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4311 nfs_fattr_init(fattr); 4312 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4313 return nfs4_do_call_sync(server->client, server, &msg, 4314 &args.seq_args, &res.seq_res, task_flags); 4315 } 4316 4317 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4318 struct nfs_fattr *fattr, struct inode *inode) 4319 { 4320 struct nfs4_exception exception = { 4321 .interruptible = true, 4322 }; 4323 int err; 4324 do { 4325 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4326 trace_nfs4_getattr(server, fhandle, fattr, err); 4327 err = nfs4_handle_exception(server, err, 4328 &exception); 4329 } while (exception.retry); 4330 return err; 4331 } 4332 4333 /* 4334 * The file is not closed if it is opened due to the a request to change 4335 * the size of the file. The open call will not be needed once the 4336 * VFS layer lookup-intents are implemented. 4337 * 4338 * Close is called when the inode is destroyed. 4339 * If we haven't opened the file for O_WRONLY, we 4340 * need to in the size_change case to obtain a stateid. 4341 * 4342 * Got race? 4343 * Because OPEN is always done by name in nfsv4, it is 4344 * possible that we opened a different file by the same 4345 * name. We can recognize this race condition, but we 4346 * can't do anything about it besides returning an error. 4347 * 4348 * This will be fixed with VFS changes (lookup-intent). 4349 */ 4350 static int 4351 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4352 struct iattr *sattr) 4353 { 4354 struct inode *inode = d_inode(dentry); 4355 const struct cred *cred = NULL; 4356 struct nfs_open_context *ctx = NULL; 4357 int status; 4358 4359 if (pnfs_ld_layoutret_on_setattr(inode) && 4360 sattr->ia_valid & ATTR_SIZE && 4361 sattr->ia_size < i_size_read(inode)) 4362 pnfs_commit_and_return_layout(inode); 4363 4364 nfs_fattr_init(fattr); 4365 4366 /* Deal with open(O_TRUNC) */ 4367 if (sattr->ia_valid & ATTR_OPEN) 4368 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4369 4370 /* Optimization: if the end result is no change, don't RPC */ 4371 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4372 return 0; 4373 4374 /* Search for an existing open(O_WRITE) file */ 4375 if (sattr->ia_valid & ATTR_FILE) { 4376 4377 ctx = nfs_file_open_context(sattr->ia_file); 4378 if (ctx) 4379 cred = ctx->cred; 4380 } 4381 4382 /* Return any delegations if we're going to change ACLs */ 4383 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4384 nfs4_inode_make_writeable(inode); 4385 4386 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4387 if (status == 0) { 4388 nfs_setattr_update_inode(inode, sattr, fattr); 4389 nfs_setsecurity(inode, fattr); 4390 } 4391 return status; 4392 } 4393 4394 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4395 struct dentry *dentry, struct nfs_fh *fhandle, 4396 struct nfs_fattr *fattr) 4397 { 4398 struct nfs_server *server = NFS_SERVER(dir); 4399 int status; 4400 struct nfs4_lookup_arg args = { 4401 .bitmask = server->attr_bitmask, 4402 .dir_fh = NFS_FH(dir), 4403 .name = &dentry->d_name, 4404 }; 4405 struct nfs4_lookup_res res = { 4406 .server = server, 4407 .fattr = fattr, 4408 .fh = fhandle, 4409 }; 4410 struct rpc_message msg = { 4411 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4412 .rpc_argp = &args, 4413 .rpc_resp = &res, 4414 }; 4415 unsigned short task_flags = 0; 4416 4417 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4418 task_flags = RPC_TASK_MOVEABLE; 4419 4420 /* Is this is an attribute revalidation, subject to softreval? */ 4421 if (nfs_lookup_is_soft_revalidate(dentry)) 4422 task_flags |= RPC_TASK_TIMEOUT; 4423 4424 args.bitmask = nfs4_bitmask(server, fattr->label); 4425 4426 nfs_fattr_init(fattr); 4427 4428 dprintk("NFS call lookup %pd2\n", dentry); 4429 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4430 status = nfs4_do_call_sync(clnt, server, &msg, 4431 &args.seq_args, &res.seq_res, task_flags); 4432 dprintk("NFS reply lookup: %d\n", status); 4433 return status; 4434 } 4435 4436 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4437 { 4438 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4439 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4440 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4441 fattr->nlink = 2; 4442 } 4443 4444 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4445 struct dentry *dentry, struct nfs_fh *fhandle, 4446 struct nfs_fattr *fattr) 4447 { 4448 struct nfs4_exception exception = { 4449 .interruptible = true, 4450 }; 4451 struct rpc_clnt *client = *clnt; 4452 const struct qstr *name = &dentry->d_name; 4453 int err; 4454 do { 4455 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4456 trace_nfs4_lookup(dir, name, err); 4457 switch (err) { 4458 case -NFS4ERR_BADNAME: 4459 err = -ENOENT; 4460 goto out; 4461 case -NFS4ERR_MOVED: 4462 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4463 if (err == -NFS4ERR_MOVED) 4464 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4465 goto out; 4466 case -NFS4ERR_WRONGSEC: 4467 err = -EPERM; 4468 if (client != *clnt) 4469 goto out; 4470 client = nfs4_negotiate_security(client, dir, name); 4471 if (IS_ERR(client)) 4472 return PTR_ERR(client); 4473 4474 exception.retry = 1; 4475 break; 4476 default: 4477 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4478 } 4479 } while (exception.retry); 4480 4481 out: 4482 if (err == 0) 4483 *clnt = client; 4484 else if (client != *clnt) 4485 rpc_shutdown_client(client); 4486 4487 return err; 4488 } 4489 4490 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4491 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4492 { 4493 int status; 4494 struct rpc_clnt *client = NFS_CLIENT(dir); 4495 4496 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4497 if (client != NFS_CLIENT(dir)) { 4498 rpc_shutdown_client(client); 4499 nfs_fixup_secinfo_attributes(fattr); 4500 } 4501 return status; 4502 } 4503 4504 struct rpc_clnt * 4505 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4506 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4507 { 4508 struct rpc_clnt *client = NFS_CLIENT(dir); 4509 int status; 4510 4511 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4512 if (status < 0) 4513 return ERR_PTR(status); 4514 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4515 } 4516 4517 static int _nfs4_proc_lookupp(struct inode *inode, 4518 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4519 { 4520 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4521 struct nfs_server *server = NFS_SERVER(inode); 4522 int status; 4523 struct nfs4_lookupp_arg args = { 4524 .bitmask = server->attr_bitmask, 4525 .fh = NFS_FH(inode), 4526 }; 4527 struct nfs4_lookupp_res res = { 4528 .server = server, 4529 .fattr = fattr, 4530 .fh = fhandle, 4531 }; 4532 struct rpc_message msg = { 4533 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4534 .rpc_argp = &args, 4535 .rpc_resp = &res, 4536 }; 4537 unsigned short task_flags = 0; 4538 4539 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4540 task_flags |= RPC_TASK_TIMEOUT; 4541 4542 args.bitmask = nfs4_bitmask(server, fattr->label); 4543 4544 nfs_fattr_init(fattr); 4545 4546 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4547 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4548 &res.seq_res, task_flags); 4549 dprintk("NFS reply lookupp: %d\n", status); 4550 return status; 4551 } 4552 4553 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4554 struct nfs_fattr *fattr) 4555 { 4556 struct nfs4_exception exception = { 4557 .interruptible = true, 4558 }; 4559 int err; 4560 do { 4561 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4562 trace_nfs4_lookupp(inode, err); 4563 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4564 &exception); 4565 } while (exception.retry); 4566 return err; 4567 } 4568 4569 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4570 const struct cred *cred) 4571 { 4572 struct nfs_server *server = NFS_SERVER(inode); 4573 struct nfs4_accessargs args = { 4574 .fh = NFS_FH(inode), 4575 .access = entry->mask, 4576 }; 4577 struct nfs4_accessres res = { 4578 .server = server, 4579 }; 4580 struct rpc_message msg = { 4581 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4582 .rpc_argp = &args, 4583 .rpc_resp = &res, 4584 .rpc_cred = cred, 4585 }; 4586 int status = 0; 4587 4588 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4589 res.fattr = nfs_alloc_fattr(); 4590 if (res.fattr == NULL) 4591 return -ENOMEM; 4592 args.bitmask = server->cache_consistency_bitmask; 4593 } 4594 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4595 if (!status) { 4596 nfs_access_set_mask(entry, res.access); 4597 if (res.fattr) 4598 nfs_refresh_inode(inode, res.fattr); 4599 } 4600 nfs_free_fattr(res.fattr); 4601 return status; 4602 } 4603 4604 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4605 const struct cred *cred) 4606 { 4607 struct nfs4_exception exception = { 4608 .interruptible = true, 4609 }; 4610 int err; 4611 do { 4612 err = _nfs4_proc_access(inode, entry, cred); 4613 trace_nfs4_access(inode, err); 4614 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4615 &exception); 4616 } while (exception.retry); 4617 return err; 4618 } 4619 4620 /* 4621 * TODO: For the time being, we don't try to get any attributes 4622 * along with any of the zero-copy operations READ, READDIR, 4623 * READLINK, WRITE. 4624 * 4625 * In the case of the first three, we want to put the GETATTR 4626 * after the read-type operation -- this is because it is hard 4627 * to predict the length of a GETATTR response in v4, and thus 4628 * align the READ data correctly. This means that the GETATTR 4629 * may end up partially falling into the page cache, and we should 4630 * shift it into the 'tail' of the xdr_buf before processing. 4631 * To do this efficiently, we need to know the total length 4632 * of data received, which doesn't seem to be available outside 4633 * of the RPC layer. 4634 * 4635 * In the case of WRITE, we also want to put the GETATTR after 4636 * the operation -- in this case because we want to make sure 4637 * we get the post-operation mtime and size. 4638 * 4639 * Both of these changes to the XDR layer would in fact be quite 4640 * minor, but I decided to leave them for a subsequent patch. 4641 */ 4642 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4643 unsigned int pgbase, unsigned int pglen) 4644 { 4645 struct nfs4_readlink args = { 4646 .fh = NFS_FH(inode), 4647 .pgbase = pgbase, 4648 .pglen = pglen, 4649 .pages = &page, 4650 }; 4651 struct nfs4_readlink_res res; 4652 struct rpc_message msg = { 4653 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4654 .rpc_argp = &args, 4655 .rpc_resp = &res, 4656 }; 4657 4658 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4659 } 4660 4661 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4662 unsigned int pgbase, unsigned int pglen) 4663 { 4664 struct nfs4_exception exception = { 4665 .interruptible = true, 4666 }; 4667 int err; 4668 do { 4669 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4670 trace_nfs4_readlink(inode, err); 4671 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4672 &exception); 4673 } while (exception.retry); 4674 return err; 4675 } 4676 4677 /* 4678 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4679 */ 4680 static int 4681 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4682 int flags) 4683 { 4684 struct nfs_server *server = NFS_SERVER(dir); 4685 struct nfs4_label l, *ilabel = NULL; 4686 struct nfs_open_context *ctx; 4687 struct nfs4_state *state; 4688 int status = 0; 4689 4690 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4691 if (IS_ERR(ctx)) 4692 return PTR_ERR(ctx); 4693 4694 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4695 4696 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4697 sattr->ia_mode &= ~current_umask(); 4698 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4699 if (IS_ERR(state)) { 4700 status = PTR_ERR(state); 4701 goto out; 4702 } 4703 out: 4704 nfs4_label_release_security(ilabel); 4705 put_nfs_open_context(ctx); 4706 return status; 4707 } 4708 4709 static int 4710 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4711 { 4712 struct nfs_server *server = NFS_SERVER(dir); 4713 struct nfs_removeargs args = { 4714 .fh = NFS_FH(dir), 4715 .name = *name, 4716 }; 4717 struct nfs_removeres res = { 4718 .server = server, 4719 }; 4720 struct rpc_message msg = { 4721 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4722 .rpc_argp = &args, 4723 .rpc_resp = &res, 4724 }; 4725 unsigned long timestamp = jiffies; 4726 int status; 4727 4728 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4729 if (status == 0) { 4730 spin_lock(&dir->i_lock); 4731 /* Removing a directory decrements nlink in the parent */ 4732 if (ftype == NF4DIR && dir->i_nlink > 2) 4733 nfs4_dec_nlink_locked(dir); 4734 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4735 NFS_INO_INVALID_DATA); 4736 spin_unlock(&dir->i_lock); 4737 } 4738 return status; 4739 } 4740 4741 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4742 { 4743 struct nfs4_exception exception = { 4744 .interruptible = true, 4745 }; 4746 struct inode *inode = d_inode(dentry); 4747 int err; 4748 4749 if (inode) { 4750 if (inode->i_nlink == 1) 4751 nfs4_inode_return_delegation(inode); 4752 else 4753 nfs4_inode_make_writeable(inode); 4754 } 4755 do { 4756 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4757 trace_nfs4_remove(dir, &dentry->d_name, err); 4758 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4759 &exception); 4760 } while (exception.retry); 4761 return err; 4762 } 4763 4764 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4765 { 4766 struct nfs4_exception exception = { 4767 .interruptible = true, 4768 }; 4769 int err; 4770 4771 do { 4772 err = _nfs4_proc_remove(dir, name, NF4DIR); 4773 trace_nfs4_remove(dir, name, err); 4774 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4775 &exception); 4776 } while (exception.retry); 4777 return err; 4778 } 4779 4780 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4781 struct dentry *dentry, 4782 struct inode *inode) 4783 { 4784 struct nfs_removeargs *args = msg->rpc_argp; 4785 struct nfs_removeres *res = msg->rpc_resp; 4786 4787 res->server = NFS_SB(dentry->d_sb); 4788 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4789 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4790 4791 nfs_fattr_init(res->dir_attr); 4792 4793 if (inode) { 4794 nfs4_inode_return_delegation(inode); 4795 nfs_d_prune_case_insensitive_aliases(inode); 4796 } 4797 } 4798 4799 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4800 { 4801 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4802 &data->args.seq_args, 4803 &data->res.seq_res, 4804 task); 4805 } 4806 4807 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4808 { 4809 struct nfs_unlinkdata *data = task->tk_calldata; 4810 struct nfs_removeres *res = &data->res; 4811 4812 if (!nfs4_sequence_done(task, &res->seq_res)) 4813 return 0; 4814 if (nfs4_async_handle_error(task, res->server, NULL, 4815 &data->timeout) == -EAGAIN) 4816 return 0; 4817 if (task->tk_status == 0) 4818 nfs4_update_changeattr(dir, &res->cinfo, 4819 res->dir_attr->time_start, 4820 NFS_INO_INVALID_DATA); 4821 return 1; 4822 } 4823 4824 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4825 struct dentry *old_dentry, 4826 struct dentry *new_dentry) 4827 { 4828 struct nfs_renameargs *arg = msg->rpc_argp; 4829 struct nfs_renameres *res = msg->rpc_resp; 4830 struct inode *old_inode = d_inode(old_dentry); 4831 struct inode *new_inode = d_inode(new_dentry); 4832 4833 if (old_inode) 4834 nfs4_inode_make_writeable(old_inode); 4835 if (new_inode) 4836 nfs4_inode_return_delegation(new_inode); 4837 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4838 res->server = NFS_SB(old_dentry->d_sb); 4839 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4840 } 4841 4842 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4843 { 4844 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4845 &data->args.seq_args, 4846 &data->res.seq_res, 4847 task); 4848 } 4849 4850 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4851 struct inode *new_dir) 4852 { 4853 struct nfs_renamedata *data = task->tk_calldata; 4854 struct nfs_renameres *res = &data->res; 4855 4856 if (!nfs4_sequence_done(task, &res->seq_res)) 4857 return 0; 4858 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4859 return 0; 4860 4861 if (task->tk_status == 0) { 4862 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4863 if (new_dir != old_dir) { 4864 /* Note: If we moved a directory, nlink will change */ 4865 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4866 res->old_fattr->time_start, 4867 NFS_INO_INVALID_NLINK | 4868 NFS_INO_INVALID_DATA); 4869 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4870 res->new_fattr->time_start, 4871 NFS_INO_INVALID_NLINK | 4872 NFS_INO_INVALID_DATA); 4873 } else 4874 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4875 res->old_fattr->time_start, 4876 NFS_INO_INVALID_DATA); 4877 } 4878 return 1; 4879 } 4880 4881 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4882 { 4883 struct nfs_server *server = NFS_SERVER(inode); 4884 __u32 bitmask[NFS4_BITMASK_SZ]; 4885 struct nfs4_link_arg arg = { 4886 .fh = NFS_FH(inode), 4887 .dir_fh = NFS_FH(dir), 4888 .name = name, 4889 .bitmask = bitmask, 4890 }; 4891 struct nfs4_link_res res = { 4892 .server = server, 4893 }; 4894 struct rpc_message msg = { 4895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4896 .rpc_argp = &arg, 4897 .rpc_resp = &res, 4898 }; 4899 int status = -ENOMEM; 4900 4901 res.fattr = nfs_alloc_fattr_with_label(server); 4902 if (res.fattr == NULL) 4903 goto out; 4904 4905 nfs4_inode_make_writeable(inode); 4906 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4907 NFS_INO_INVALID_CHANGE); 4908 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4909 if (!status) { 4910 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4911 NFS_INO_INVALID_DATA); 4912 nfs4_inc_nlink(inode); 4913 status = nfs_post_op_update_inode(inode, res.fattr); 4914 if (!status) 4915 nfs_setsecurity(inode, res.fattr); 4916 } 4917 4918 out: 4919 nfs_free_fattr(res.fattr); 4920 return status; 4921 } 4922 4923 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4924 { 4925 struct nfs4_exception exception = { 4926 .interruptible = true, 4927 }; 4928 int err; 4929 do { 4930 err = nfs4_handle_exception(NFS_SERVER(inode), 4931 _nfs4_proc_link(inode, dir, name), 4932 &exception); 4933 } while (exception.retry); 4934 return err; 4935 } 4936 4937 struct nfs4_createdata { 4938 struct rpc_message msg; 4939 struct nfs4_create_arg arg; 4940 struct nfs4_create_res res; 4941 struct nfs_fh fh; 4942 struct nfs_fattr fattr; 4943 }; 4944 4945 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4946 const struct qstr *name, struct iattr *sattr, u32 ftype) 4947 { 4948 struct nfs4_createdata *data; 4949 4950 data = kzalloc(sizeof(*data), GFP_KERNEL); 4951 if (data != NULL) { 4952 struct nfs_server *server = NFS_SERVER(dir); 4953 4954 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4955 if (IS_ERR(data->fattr.label)) 4956 goto out_free; 4957 4958 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4959 data->msg.rpc_argp = &data->arg; 4960 data->msg.rpc_resp = &data->res; 4961 data->arg.dir_fh = NFS_FH(dir); 4962 data->arg.server = server; 4963 data->arg.name = name; 4964 data->arg.attrs = sattr; 4965 data->arg.ftype = ftype; 4966 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4967 data->arg.umask = current_umask(); 4968 data->res.server = server; 4969 data->res.fh = &data->fh; 4970 data->res.fattr = &data->fattr; 4971 nfs_fattr_init(data->res.fattr); 4972 } 4973 return data; 4974 out_free: 4975 kfree(data); 4976 return NULL; 4977 } 4978 4979 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4980 { 4981 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4982 &data->arg.seq_args, &data->res.seq_res, 1); 4983 if (status == 0) { 4984 spin_lock(&dir->i_lock); 4985 /* Creating a directory bumps nlink in the parent */ 4986 if (data->arg.ftype == NF4DIR) 4987 nfs4_inc_nlink_locked(dir); 4988 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4989 data->res.fattr->time_start, 4990 NFS_INO_INVALID_DATA); 4991 spin_unlock(&dir->i_lock); 4992 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 4993 } 4994 return status; 4995 } 4996 4997 static void nfs4_free_createdata(struct nfs4_createdata *data) 4998 { 4999 nfs4_label_free(data->fattr.label); 5000 kfree(data); 5001 } 5002 5003 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5004 struct page *page, unsigned int len, struct iattr *sattr, 5005 struct nfs4_label *label) 5006 { 5007 struct nfs4_createdata *data; 5008 int status = -ENAMETOOLONG; 5009 5010 if (len > NFS4_MAXPATHLEN) 5011 goto out; 5012 5013 status = -ENOMEM; 5014 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5015 if (data == NULL) 5016 goto out; 5017 5018 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5019 data->arg.u.symlink.pages = &page; 5020 data->arg.u.symlink.len = len; 5021 data->arg.label = label; 5022 5023 status = nfs4_do_create(dir, dentry, data); 5024 5025 nfs4_free_createdata(data); 5026 out: 5027 return status; 5028 } 5029 5030 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5031 struct page *page, unsigned int len, struct iattr *sattr) 5032 { 5033 struct nfs4_exception exception = { 5034 .interruptible = true, 5035 }; 5036 struct nfs4_label l, *label = NULL; 5037 int err; 5038 5039 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5040 5041 do { 5042 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5043 trace_nfs4_symlink(dir, &dentry->d_name, err); 5044 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5045 &exception); 5046 } while (exception.retry); 5047 5048 nfs4_label_release_security(label); 5049 return err; 5050 } 5051 5052 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5053 struct iattr *sattr, struct nfs4_label *label) 5054 { 5055 struct nfs4_createdata *data; 5056 int status = -ENOMEM; 5057 5058 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5059 if (data == NULL) 5060 goto out; 5061 5062 data->arg.label = label; 5063 status = nfs4_do_create(dir, dentry, data); 5064 5065 nfs4_free_createdata(data); 5066 out: 5067 return status; 5068 } 5069 5070 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5071 struct iattr *sattr) 5072 { 5073 struct nfs_server *server = NFS_SERVER(dir); 5074 struct nfs4_exception exception = { 5075 .interruptible = true, 5076 }; 5077 struct nfs4_label l, *label = NULL; 5078 int err; 5079 5080 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5081 5082 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5083 sattr->ia_mode &= ~current_umask(); 5084 do { 5085 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5086 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5087 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5088 &exception); 5089 } while (exception.retry); 5090 nfs4_label_release_security(label); 5091 5092 return err; 5093 } 5094 5095 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5096 struct nfs_readdir_res *nr_res) 5097 { 5098 struct inode *dir = d_inode(nr_arg->dentry); 5099 struct nfs_server *server = NFS_SERVER(dir); 5100 struct nfs4_readdir_arg args = { 5101 .fh = NFS_FH(dir), 5102 .pages = nr_arg->pages, 5103 .pgbase = 0, 5104 .count = nr_arg->page_len, 5105 .plus = nr_arg->plus, 5106 }; 5107 struct nfs4_readdir_res res; 5108 struct rpc_message msg = { 5109 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5110 .rpc_argp = &args, 5111 .rpc_resp = &res, 5112 .rpc_cred = nr_arg->cred, 5113 }; 5114 int status; 5115 5116 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5117 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5118 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5119 args.bitmask = server->attr_bitmask_nl; 5120 else 5121 args.bitmask = server->attr_bitmask; 5122 5123 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5124 res.pgbase = args.pgbase; 5125 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5126 &res.seq_res, 0); 5127 if (status >= 0) { 5128 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5129 status += args.pgbase; 5130 } 5131 5132 nfs_invalidate_atime(dir); 5133 5134 dprintk("%s: returns %d\n", __func__, status); 5135 return status; 5136 } 5137 5138 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5139 struct nfs_readdir_res *res) 5140 { 5141 struct nfs4_exception exception = { 5142 .interruptible = true, 5143 }; 5144 int err; 5145 do { 5146 err = _nfs4_proc_readdir(arg, res); 5147 trace_nfs4_readdir(d_inode(arg->dentry), err); 5148 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5149 err, &exception); 5150 } while (exception.retry); 5151 return err; 5152 } 5153 5154 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5155 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5156 { 5157 struct nfs4_createdata *data; 5158 int mode = sattr->ia_mode; 5159 int status = -ENOMEM; 5160 5161 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5162 if (data == NULL) 5163 goto out; 5164 5165 if (S_ISFIFO(mode)) 5166 data->arg.ftype = NF4FIFO; 5167 else if (S_ISBLK(mode)) { 5168 data->arg.ftype = NF4BLK; 5169 data->arg.u.device.specdata1 = MAJOR(rdev); 5170 data->arg.u.device.specdata2 = MINOR(rdev); 5171 } 5172 else if (S_ISCHR(mode)) { 5173 data->arg.ftype = NF4CHR; 5174 data->arg.u.device.specdata1 = MAJOR(rdev); 5175 data->arg.u.device.specdata2 = MINOR(rdev); 5176 } else if (!S_ISSOCK(mode)) { 5177 status = -EINVAL; 5178 goto out_free; 5179 } 5180 5181 data->arg.label = label; 5182 status = nfs4_do_create(dir, dentry, data); 5183 out_free: 5184 nfs4_free_createdata(data); 5185 out: 5186 return status; 5187 } 5188 5189 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5190 struct iattr *sattr, dev_t rdev) 5191 { 5192 struct nfs_server *server = NFS_SERVER(dir); 5193 struct nfs4_exception exception = { 5194 .interruptible = true, 5195 }; 5196 struct nfs4_label l, *label = NULL; 5197 int err; 5198 5199 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5200 5201 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5202 sattr->ia_mode &= ~current_umask(); 5203 do { 5204 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5205 trace_nfs4_mknod(dir, &dentry->d_name, err); 5206 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5207 &exception); 5208 } while (exception.retry); 5209 5210 nfs4_label_release_security(label); 5211 5212 return err; 5213 } 5214 5215 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5216 struct nfs_fsstat *fsstat) 5217 { 5218 struct nfs4_statfs_arg args = { 5219 .fh = fhandle, 5220 .bitmask = server->attr_bitmask, 5221 }; 5222 struct nfs4_statfs_res res = { 5223 .fsstat = fsstat, 5224 }; 5225 struct rpc_message msg = { 5226 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5227 .rpc_argp = &args, 5228 .rpc_resp = &res, 5229 }; 5230 5231 nfs_fattr_init(fsstat->fattr); 5232 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5233 } 5234 5235 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5236 { 5237 struct nfs4_exception exception = { 5238 .interruptible = true, 5239 }; 5240 int err; 5241 do { 5242 err = nfs4_handle_exception(server, 5243 _nfs4_proc_statfs(server, fhandle, fsstat), 5244 &exception); 5245 } while (exception.retry); 5246 return err; 5247 } 5248 5249 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5250 struct nfs_fsinfo *fsinfo) 5251 { 5252 struct nfs4_fsinfo_arg args = { 5253 .fh = fhandle, 5254 .bitmask = server->attr_bitmask, 5255 }; 5256 struct nfs4_fsinfo_res res = { 5257 .fsinfo = fsinfo, 5258 }; 5259 struct rpc_message msg = { 5260 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5261 .rpc_argp = &args, 5262 .rpc_resp = &res, 5263 }; 5264 5265 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5266 } 5267 5268 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5269 { 5270 struct nfs4_exception exception = { 5271 .interruptible = true, 5272 }; 5273 int err; 5274 5275 do { 5276 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5277 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5278 if (err == 0) { 5279 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5280 break; 5281 } 5282 err = nfs4_handle_exception(server, err, &exception); 5283 } while (exception.retry); 5284 return err; 5285 } 5286 5287 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5288 { 5289 int error; 5290 5291 nfs_fattr_init(fsinfo->fattr); 5292 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5293 if (error == 0) { 5294 /* block layout checks this! */ 5295 server->pnfs_blksize = fsinfo->blksize; 5296 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5297 } 5298 5299 return error; 5300 } 5301 5302 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5303 struct nfs_pathconf *pathconf) 5304 { 5305 struct nfs4_pathconf_arg args = { 5306 .fh = fhandle, 5307 .bitmask = server->attr_bitmask, 5308 }; 5309 struct nfs4_pathconf_res res = { 5310 .pathconf = pathconf, 5311 }; 5312 struct rpc_message msg = { 5313 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5314 .rpc_argp = &args, 5315 .rpc_resp = &res, 5316 }; 5317 5318 /* None of the pathconf attributes are mandatory to implement */ 5319 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5320 memset(pathconf, 0, sizeof(*pathconf)); 5321 return 0; 5322 } 5323 5324 nfs_fattr_init(pathconf->fattr); 5325 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5326 } 5327 5328 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5329 struct nfs_pathconf *pathconf) 5330 { 5331 struct nfs4_exception exception = { 5332 .interruptible = true, 5333 }; 5334 int err; 5335 5336 do { 5337 err = nfs4_handle_exception(server, 5338 _nfs4_proc_pathconf(server, fhandle, pathconf), 5339 &exception); 5340 } while (exception.retry); 5341 return err; 5342 } 5343 5344 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5345 const struct nfs_open_context *ctx, 5346 const struct nfs_lock_context *l_ctx, 5347 fmode_t fmode) 5348 { 5349 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5350 } 5351 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5352 5353 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5354 const struct nfs_open_context *ctx, 5355 const struct nfs_lock_context *l_ctx, 5356 fmode_t fmode) 5357 { 5358 nfs4_stateid _current_stateid; 5359 5360 /* If the current stateid represents a lost lock, then exit */ 5361 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5362 return true; 5363 return nfs4_stateid_match(stateid, &_current_stateid); 5364 } 5365 5366 static bool nfs4_error_stateid_expired(int err) 5367 { 5368 switch (err) { 5369 case -NFS4ERR_DELEG_REVOKED: 5370 case -NFS4ERR_ADMIN_REVOKED: 5371 case -NFS4ERR_BAD_STATEID: 5372 case -NFS4ERR_STALE_STATEID: 5373 case -NFS4ERR_OLD_STATEID: 5374 case -NFS4ERR_OPENMODE: 5375 case -NFS4ERR_EXPIRED: 5376 return true; 5377 } 5378 return false; 5379 } 5380 5381 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5382 { 5383 struct nfs_server *server = NFS_SERVER(hdr->inode); 5384 5385 trace_nfs4_read(hdr, task->tk_status); 5386 if (task->tk_status < 0) { 5387 struct nfs4_exception exception = { 5388 .inode = hdr->inode, 5389 .state = hdr->args.context->state, 5390 .stateid = &hdr->args.stateid, 5391 }; 5392 task->tk_status = nfs4_async_handle_exception(task, 5393 server, task->tk_status, &exception); 5394 if (exception.retry) { 5395 rpc_restart_call_prepare(task); 5396 return -EAGAIN; 5397 } 5398 } 5399 5400 if (task->tk_status > 0) 5401 renew_lease(server, hdr->timestamp); 5402 return 0; 5403 } 5404 5405 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5406 struct nfs_pgio_args *args) 5407 { 5408 5409 if (!nfs4_error_stateid_expired(task->tk_status) || 5410 nfs4_stateid_is_current(&args->stateid, 5411 args->context, 5412 args->lock_context, 5413 FMODE_READ)) 5414 return false; 5415 rpc_restart_call_prepare(task); 5416 return true; 5417 } 5418 5419 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5420 struct nfs_pgio_header *hdr) 5421 { 5422 struct nfs_server *server = NFS_SERVER(hdr->inode); 5423 struct rpc_message *msg = &task->tk_msg; 5424 5425 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5426 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5427 server->caps &= ~NFS_CAP_READ_PLUS; 5428 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5429 rpc_restart_call_prepare(task); 5430 return true; 5431 } 5432 return false; 5433 } 5434 5435 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5436 { 5437 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5438 return -EAGAIN; 5439 if (nfs4_read_stateid_changed(task, &hdr->args)) 5440 return -EAGAIN; 5441 if (nfs4_read_plus_not_supported(task, hdr)) 5442 return -EAGAIN; 5443 if (task->tk_status > 0) 5444 nfs_invalidate_atime(hdr->inode); 5445 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5446 nfs4_read_done_cb(task, hdr); 5447 } 5448 5449 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5450 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5451 struct rpc_message *msg) 5452 { 5453 /* Note: We don't use READ_PLUS with pNFS yet */ 5454 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) 5455 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5456 } 5457 #else 5458 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5459 struct rpc_message *msg) 5460 { 5461 } 5462 #endif /* CONFIG_NFS_V4_2 */ 5463 5464 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5465 struct rpc_message *msg) 5466 { 5467 hdr->timestamp = jiffies; 5468 if (!hdr->pgio_done_cb) 5469 hdr->pgio_done_cb = nfs4_read_done_cb; 5470 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5471 nfs42_read_plus_support(hdr, msg); 5472 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5473 } 5474 5475 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5476 struct nfs_pgio_header *hdr) 5477 { 5478 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5479 &hdr->args.seq_args, 5480 &hdr->res.seq_res, 5481 task)) 5482 return 0; 5483 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5484 hdr->args.lock_context, 5485 hdr->rw_mode) == -EIO) 5486 return -EIO; 5487 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5488 return -EIO; 5489 return 0; 5490 } 5491 5492 static int nfs4_write_done_cb(struct rpc_task *task, 5493 struct nfs_pgio_header *hdr) 5494 { 5495 struct inode *inode = hdr->inode; 5496 5497 trace_nfs4_write(hdr, task->tk_status); 5498 if (task->tk_status < 0) { 5499 struct nfs4_exception exception = { 5500 .inode = hdr->inode, 5501 .state = hdr->args.context->state, 5502 .stateid = &hdr->args.stateid, 5503 }; 5504 task->tk_status = nfs4_async_handle_exception(task, 5505 NFS_SERVER(inode), task->tk_status, 5506 &exception); 5507 if (exception.retry) { 5508 rpc_restart_call_prepare(task); 5509 return -EAGAIN; 5510 } 5511 } 5512 if (task->tk_status >= 0) { 5513 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5514 nfs_writeback_update_inode(hdr); 5515 } 5516 return 0; 5517 } 5518 5519 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5520 struct nfs_pgio_args *args) 5521 { 5522 5523 if (!nfs4_error_stateid_expired(task->tk_status) || 5524 nfs4_stateid_is_current(&args->stateid, 5525 args->context, 5526 args->lock_context, 5527 FMODE_WRITE)) 5528 return false; 5529 rpc_restart_call_prepare(task); 5530 return true; 5531 } 5532 5533 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5534 { 5535 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5536 return -EAGAIN; 5537 if (nfs4_write_stateid_changed(task, &hdr->args)) 5538 return -EAGAIN; 5539 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5540 nfs4_write_done_cb(task, hdr); 5541 } 5542 5543 static 5544 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5545 { 5546 /* Don't request attributes for pNFS or O_DIRECT writes */ 5547 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5548 return false; 5549 /* Otherwise, request attributes if and only if we don't hold 5550 * a delegation 5551 */ 5552 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5553 } 5554 5555 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5556 struct inode *inode, unsigned long cache_validity) 5557 { 5558 struct nfs_server *server = NFS_SERVER(inode); 5559 unsigned int i; 5560 5561 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5562 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5563 5564 if (cache_validity & NFS_INO_INVALID_CHANGE) 5565 bitmask[0] |= FATTR4_WORD0_CHANGE; 5566 if (cache_validity & NFS_INO_INVALID_ATIME) 5567 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5568 if (cache_validity & NFS_INO_INVALID_MODE) 5569 bitmask[1] |= FATTR4_WORD1_MODE; 5570 if (cache_validity & NFS_INO_INVALID_OTHER) 5571 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5572 if (cache_validity & NFS_INO_INVALID_NLINK) 5573 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5574 if (cache_validity & NFS_INO_INVALID_CTIME) 5575 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5576 if (cache_validity & NFS_INO_INVALID_MTIME) 5577 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5578 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5579 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5580 5581 if (cache_validity & NFS_INO_INVALID_SIZE) 5582 bitmask[0] |= FATTR4_WORD0_SIZE; 5583 5584 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5585 bitmask[i] &= server->attr_bitmask[i]; 5586 } 5587 5588 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5589 struct rpc_message *msg, 5590 struct rpc_clnt **clnt) 5591 { 5592 struct nfs_server *server = NFS_SERVER(hdr->inode); 5593 5594 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5595 hdr->args.bitmask = NULL; 5596 hdr->res.fattr = NULL; 5597 } else { 5598 nfs4_bitmask_set(hdr->args.bitmask_store, 5599 server->cache_consistency_bitmask, 5600 hdr->inode, NFS_INO_INVALID_BLOCKS); 5601 hdr->args.bitmask = hdr->args.bitmask_store; 5602 } 5603 5604 if (!hdr->pgio_done_cb) 5605 hdr->pgio_done_cb = nfs4_write_done_cb; 5606 hdr->res.server = server; 5607 hdr->timestamp = jiffies; 5608 5609 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5610 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5611 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5612 } 5613 5614 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5615 { 5616 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5617 &data->args.seq_args, 5618 &data->res.seq_res, 5619 task); 5620 } 5621 5622 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5623 { 5624 struct inode *inode = data->inode; 5625 5626 trace_nfs4_commit(data, task->tk_status); 5627 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5628 NULL, NULL) == -EAGAIN) { 5629 rpc_restart_call_prepare(task); 5630 return -EAGAIN; 5631 } 5632 return 0; 5633 } 5634 5635 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5636 { 5637 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5638 return -EAGAIN; 5639 return data->commit_done_cb(task, data); 5640 } 5641 5642 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5643 struct rpc_clnt **clnt) 5644 { 5645 struct nfs_server *server = NFS_SERVER(data->inode); 5646 5647 if (data->commit_done_cb == NULL) 5648 data->commit_done_cb = nfs4_commit_done_cb; 5649 data->res.server = server; 5650 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5651 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5652 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5653 } 5654 5655 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5656 struct nfs_commitres *res) 5657 { 5658 struct inode *dst_inode = file_inode(dst); 5659 struct nfs_server *server = NFS_SERVER(dst_inode); 5660 struct rpc_message msg = { 5661 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5662 .rpc_argp = args, 5663 .rpc_resp = res, 5664 }; 5665 5666 args->fh = NFS_FH(dst_inode); 5667 return nfs4_call_sync(server->client, server, &msg, 5668 &args->seq_args, &res->seq_res, 1); 5669 } 5670 5671 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5672 { 5673 struct nfs_commitargs args = { 5674 .offset = offset, 5675 .count = count, 5676 }; 5677 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5678 struct nfs4_exception exception = { }; 5679 int status; 5680 5681 do { 5682 status = _nfs4_proc_commit(dst, &args, res); 5683 status = nfs4_handle_exception(dst_server, status, &exception); 5684 } while (exception.retry); 5685 5686 return status; 5687 } 5688 5689 struct nfs4_renewdata { 5690 struct nfs_client *client; 5691 unsigned long timestamp; 5692 }; 5693 5694 /* 5695 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5696 * standalone procedure for queueing an asynchronous RENEW. 5697 */ 5698 static void nfs4_renew_release(void *calldata) 5699 { 5700 struct nfs4_renewdata *data = calldata; 5701 struct nfs_client *clp = data->client; 5702 5703 if (refcount_read(&clp->cl_count) > 1) 5704 nfs4_schedule_state_renewal(clp); 5705 nfs_put_client(clp); 5706 kfree(data); 5707 } 5708 5709 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5710 { 5711 struct nfs4_renewdata *data = calldata; 5712 struct nfs_client *clp = data->client; 5713 unsigned long timestamp = data->timestamp; 5714 5715 trace_nfs4_renew_async(clp, task->tk_status); 5716 switch (task->tk_status) { 5717 case 0: 5718 break; 5719 case -NFS4ERR_LEASE_MOVED: 5720 nfs4_schedule_lease_moved_recovery(clp); 5721 break; 5722 default: 5723 /* Unless we're shutting down, schedule state recovery! */ 5724 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5725 return; 5726 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5727 nfs4_schedule_lease_recovery(clp); 5728 return; 5729 } 5730 nfs4_schedule_path_down_recovery(clp); 5731 } 5732 do_renew_lease(clp, timestamp); 5733 } 5734 5735 static const struct rpc_call_ops nfs4_renew_ops = { 5736 .rpc_call_done = nfs4_renew_done, 5737 .rpc_release = nfs4_renew_release, 5738 }; 5739 5740 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5741 { 5742 struct rpc_message msg = { 5743 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5744 .rpc_argp = clp, 5745 .rpc_cred = cred, 5746 }; 5747 struct nfs4_renewdata *data; 5748 5749 if (renew_flags == 0) 5750 return 0; 5751 if (!refcount_inc_not_zero(&clp->cl_count)) 5752 return -EIO; 5753 data = kmalloc(sizeof(*data), GFP_NOFS); 5754 if (data == NULL) { 5755 nfs_put_client(clp); 5756 return -ENOMEM; 5757 } 5758 data->client = clp; 5759 data->timestamp = jiffies; 5760 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5761 &nfs4_renew_ops, data); 5762 } 5763 5764 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5765 { 5766 struct rpc_message msg = { 5767 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5768 .rpc_argp = clp, 5769 .rpc_cred = cred, 5770 }; 5771 unsigned long now = jiffies; 5772 int status; 5773 5774 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5775 if (status < 0) 5776 return status; 5777 do_renew_lease(clp, now); 5778 return 0; 5779 } 5780 5781 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5782 enum nfs4_acl_type type) 5783 { 5784 switch (type) { 5785 default: 5786 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5787 case NFS4ACL_DACL: 5788 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5789 case NFS4ACL_SACL: 5790 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5791 } 5792 } 5793 5794 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5795 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5796 * the stack. 5797 */ 5798 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5799 5800 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5801 struct page **pages) 5802 { 5803 struct page *newpage, **spages; 5804 int rc = 0; 5805 size_t len; 5806 spages = pages; 5807 5808 do { 5809 len = min_t(size_t, PAGE_SIZE, buflen); 5810 newpage = alloc_page(GFP_KERNEL); 5811 5812 if (newpage == NULL) 5813 goto unwind; 5814 memcpy(page_address(newpage), buf, len); 5815 buf += len; 5816 buflen -= len; 5817 *pages++ = newpage; 5818 rc++; 5819 } while (buflen != 0); 5820 5821 return rc; 5822 5823 unwind: 5824 for(; rc > 0; rc--) 5825 __free_page(spages[rc-1]); 5826 return -ENOMEM; 5827 } 5828 5829 struct nfs4_cached_acl { 5830 enum nfs4_acl_type type; 5831 int cached; 5832 size_t len; 5833 char data[]; 5834 }; 5835 5836 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5837 { 5838 struct nfs_inode *nfsi = NFS_I(inode); 5839 5840 spin_lock(&inode->i_lock); 5841 kfree(nfsi->nfs4_acl); 5842 nfsi->nfs4_acl = acl; 5843 spin_unlock(&inode->i_lock); 5844 } 5845 5846 static void nfs4_zap_acl_attr(struct inode *inode) 5847 { 5848 nfs4_set_cached_acl(inode, NULL); 5849 } 5850 5851 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5852 size_t buflen, enum nfs4_acl_type type) 5853 { 5854 struct nfs_inode *nfsi = NFS_I(inode); 5855 struct nfs4_cached_acl *acl; 5856 int ret = -ENOENT; 5857 5858 spin_lock(&inode->i_lock); 5859 acl = nfsi->nfs4_acl; 5860 if (acl == NULL) 5861 goto out; 5862 if (acl->type != type) 5863 goto out; 5864 if (buf == NULL) /* user is just asking for length */ 5865 goto out_len; 5866 if (acl->cached == 0) 5867 goto out; 5868 ret = -ERANGE; /* see getxattr(2) man page */ 5869 if (acl->len > buflen) 5870 goto out; 5871 memcpy(buf, acl->data, acl->len); 5872 out_len: 5873 ret = acl->len; 5874 out: 5875 spin_unlock(&inode->i_lock); 5876 return ret; 5877 } 5878 5879 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5880 size_t pgbase, size_t acl_len, 5881 enum nfs4_acl_type type) 5882 { 5883 struct nfs4_cached_acl *acl; 5884 size_t buflen = sizeof(*acl) + acl_len; 5885 5886 if (buflen <= PAGE_SIZE) { 5887 acl = kmalloc(buflen, GFP_KERNEL); 5888 if (acl == NULL) 5889 goto out; 5890 acl->cached = 1; 5891 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5892 } else { 5893 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5894 if (acl == NULL) 5895 goto out; 5896 acl->cached = 0; 5897 } 5898 acl->type = type; 5899 acl->len = acl_len; 5900 out: 5901 nfs4_set_cached_acl(inode, acl); 5902 } 5903 5904 /* 5905 * The getxattr API returns the required buffer length when called with a 5906 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5907 * the required buf. On a NULL buf, we send a page of data to the server 5908 * guessing that the ACL request can be serviced by a page. If so, we cache 5909 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5910 * the cache. If not so, we throw away the page, and cache the required 5911 * length. The next getxattr call will then produce another round trip to 5912 * the server, this time with the input buf of the required size. 5913 */ 5914 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5915 size_t buflen, enum nfs4_acl_type type) 5916 { 5917 struct page **pages; 5918 struct nfs_getaclargs args = { 5919 .fh = NFS_FH(inode), 5920 .acl_type = type, 5921 .acl_len = buflen, 5922 }; 5923 struct nfs_getaclres res = { 5924 .acl_type = type, 5925 .acl_len = buflen, 5926 }; 5927 struct rpc_message msg = { 5928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5929 .rpc_argp = &args, 5930 .rpc_resp = &res, 5931 }; 5932 unsigned int npages; 5933 int ret = -ENOMEM, i; 5934 struct nfs_server *server = NFS_SERVER(inode); 5935 5936 if (buflen == 0) 5937 buflen = server->rsize; 5938 5939 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5940 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5941 if (!pages) 5942 return -ENOMEM; 5943 5944 args.acl_pages = pages; 5945 5946 for (i = 0; i < npages; i++) { 5947 pages[i] = alloc_page(GFP_KERNEL); 5948 if (!pages[i]) 5949 goto out_free; 5950 } 5951 5952 /* for decoding across pages */ 5953 res.acl_scratch = alloc_page(GFP_KERNEL); 5954 if (!res.acl_scratch) 5955 goto out_free; 5956 5957 args.acl_len = npages * PAGE_SIZE; 5958 5959 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5960 __func__, buf, buflen, npages, args.acl_len); 5961 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5962 &msg, &args.seq_args, &res.seq_res, 0); 5963 if (ret) 5964 goto out_free; 5965 5966 /* Handle the case where the passed-in buffer is too short */ 5967 if (res.acl_flags & NFS4_ACL_TRUNC) { 5968 /* Did the user only issue a request for the acl length? */ 5969 if (buf == NULL) 5970 goto out_ok; 5971 ret = -ERANGE; 5972 goto out_free; 5973 } 5974 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5975 type); 5976 if (buf) { 5977 if (res.acl_len > buflen) { 5978 ret = -ERANGE; 5979 goto out_free; 5980 } 5981 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5982 } 5983 out_ok: 5984 ret = res.acl_len; 5985 out_free: 5986 for (i = 0; i < npages; i++) 5987 if (pages[i]) 5988 __free_page(pages[i]); 5989 if (res.acl_scratch) 5990 __free_page(res.acl_scratch); 5991 kfree(pages); 5992 return ret; 5993 } 5994 5995 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 5996 size_t buflen, enum nfs4_acl_type type) 5997 { 5998 struct nfs4_exception exception = { 5999 .interruptible = true, 6000 }; 6001 ssize_t ret; 6002 do { 6003 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6004 trace_nfs4_get_acl(inode, ret); 6005 if (ret >= 0) 6006 break; 6007 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6008 } while (exception.retry); 6009 return ret; 6010 } 6011 6012 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6013 enum nfs4_acl_type type) 6014 { 6015 struct nfs_server *server = NFS_SERVER(inode); 6016 int ret; 6017 6018 if (!nfs4_server_supports_acls(server, type)) 6019 return -EOPNOTSUPP; 6020 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6021 if (ret < 0) 6022 return ret; 6023 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6024 nfs_zap_acl_cache(inode); 6025 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6026 if (ret != -ENOENT) 6027 /* -ENOENT is returned if there is no ACL or if there is an ACL 6028 * but no cached acl data, just the acl length */ 6029 return ret; 6030 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6031 } 6032 6033 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6034 size_t buflen, enum nfs4_acl_type type) 6035 { 6036 struct nfs_server *server = NFS_SERVER(inode); 6037 struct page *pages[NFS4ACL_MAXPAGES]; 6038 struct nfs_setaclargs arg = { 6039 .fh = NFS_FH(inode), 6040 .acl_type = type, 6041 .acl_len = buflen, 6042 .acl_pages = pages, 6043 }; 6044 struct nfs_setaclres res; 6045 struct rpc_message msg = { 6046 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6047 .rpc_argp = &arg, 6048 .rpc_resp = &res, 6049 }; 6050 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6051 int ret, i; 6052 6053 /* You can't remove system.nfs4_acl: */ 6054 if (buflen == 0) 6055 return -EINVAL; 6056 if (!nfs4_server_supports_acls(server, type)) 6057 return -EOPNOTSUPP; 6058 if (npages > ARRAY_SIZE(pages)) 6059 return -ERANGE; 6060 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6061 if (i < 0) 6062 return i; 6063 nfs4_inode_make_writeable(inode); 6064 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6065 6066 /* 6067 * Free each page after tx, so the only ref left is 6068 * held by the network stack 6069 */ 6070 for (; i > 0; i--) 6071 put_page(pages[i-1]); 6072 6073 /* 6074 * Acl update can result in inode attribute update. 6075 * so mark the attribute cache invalid. 6076 */ 6077 spin_lock(&inode->i_lock); 6078 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6079 NFS_INO_INVALID_CTIME | 6080 NFS_INO_REVAL_FORCED); 6081 spin_unlock(&inode->i_lock); 6082 nfs_access_zap_cache(inode); 6083 nfs_zap_acl_cache(inode); 6084 return ret; 6085 } 6086 6087 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6088 size_t buflen, enum nfs4_acl_type type) 6089 { 6090 struct nfs4_exception exception = { }; 6091 int err; 6092 do { 6093 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6094 trace_nfs4_set_acl(inode, err); 6095 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6096 /* 6097 * no need to retry since the kernel 6098 * isn't involved in encoding the ACEs. 6099 */ 6100 err = -EINVAL; 6101 break; 6102 } 6103 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6104 &exception); 6105 } while (exception.retry); 6106 return err; 6107 } 6108 6109 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6110 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6111 size_t buflen) 6112 { 6113 struct nfs_server *server = NFS_SERVER(inode); 6114 struct nfs4_label label = {0, 0, buflen, buf}; 6115 6116 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6117 struct nfs_fattr fattr = { 6118 .label = &label, 6119 }; 6120 struct nfs4_getattr_arg arg = { 6121 .fh = NFS_FH(inode), 6122 .bitmask = bitmask, 6123 }; 6124 struct nfs4_getattr_res res = { 6125 .fattr = &fattr, 6126 .server = server, 6127 }; 6128 struct rpc_message msg = { 6129 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6130 .rpc_argp = &arg, 6131 .rpc_resp = &res, 6132 }; 6133 int ret; 6134 6135 nfs_fattr_init(&fattr); 6136 6137 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6138 if (ret) 6139 return ret; 6140 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6141 return -ENOENT; 6142 return label.len; 6143 } 6144 6145 static int nfs4_get_security_label(struct inode *inode, void *buf, 6146 size_t buflen) 6147 { 6148 struct nfs4_exception exception = { 6149 .interruptible = true, 6150 }; 6151 int err; 6152 6153 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6154 return -EOPNOTSUPP; 6155 6156 do { 6157 err = _nfs4_get_security_label(inode, buf, buflen); 6158 trace_nfs4_get_security_label(inode, err); 6159 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6160 &exception); 6161 } while (exception.retry); 6162 return err; 6163 } 6164 6165 static int _nfs4_do_set_security_label(struct inode *inode, 6166 struct nfs4_label *ilabel, 6167 struct nfs_fattr *fattr) 6168 { 6169 6170 struct iattr sattr = {0}; 6171 struct nfs_server *server = NFS_SERVER(inode); 6172 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6173 struct nfs_setattrargs arg = { 6174 .fh = NFS_FH(inode), 6175 .iap = &sattr, 6176 .server = server, 6177 .bitmask = bitmask, 6178 .label = ilabel, 6179 }; 6180 struct nfs_setattrres res = { 6181 .fattr = fattr, 6182 .server = server, 6183 }; 6184 struct rpc_message msg = { 6185 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6186 .rpc_argp = &arg, 6187 .rpc_resp = &res, 6188 }; 6189 int status; 6190 6191 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6192 6193 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6194 if (status) 6195 dprintk("%s failed: %d\n", __func__, status); 6196 6197 return status; 6198 } 6199 6200 static int nfs4_do_set_security_label(struct inode *inode, 6201 struct nfs4_label *ilabel, 6202 struct nfs_fattr *fattr) 6203 { 6204 struct nfs4_exception exception = { }; 6205 int err; 6206 6207 do { 6208 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6209 trace_nfs4_set_security_label(inode, err); 6210 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6211 &exception); 6212 } while (exception.retry); 6213 return err; 6214 } 6215 6216 static int 6217 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6218 { 6219 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6220 struct nfs_fattr *fattr; 6221 int status; 6222 6223 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6224 return -EOPNOTSUPP; 6225 6226 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6227 if (fattr == NULL) 6228 return -ENOMEM; 6229 6230 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6231 if (status == 0) 6232 nfs_setsecurity(inode, fattr); 6233 6234 return status; 6235 } 6236 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6237 6238 6239 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6240 nfs4_verifier *bootverf) 6241 { 6242 __be32 verf[2]; 6243 6244 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6245 /* An impossible timestamp guarantees this value 6246 * will never match a generated boot time. */ 6247 verf[0] = cpu_to_be32(U32_MAX); 6248 verf[1] = cpu_to_be32(U32_MAX); 6249 } else { 6250 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6251 u64 ns = ktime_to_ns(nn->boot_time); 6252 6253 verf[0] = cpu_to_be32(ns >> 32); 6254 verf[1] = cpu_to_be32(ns); 6255 } 6256 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6257 } 6258 6259 static size_t 6260 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6261 { 6262 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6263 struct nfs_netns_client *nn_clp = nn->nfs_client; 6264 const char *id; 6265 6266 buf[0] = '\0'; 6267 6268 if (nn_clp) { 6269 rcu_read_lock(); 6270 id = rcu_dereference(nn_clp->identifier); 6271 if (id) 6272 strscpy(buf, id, buflen); 6273 rcu_read_unlock(); 6274 } 6275 6276 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6277 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6278 6279 return strlen(buf); 6280 } 6281 6282 static int 6283 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6284 { 6285 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6286 size_t buflen; 6287 size_t len; 6288 char *str; 6289 6290 if (clp->cl_owner_id != NULL) 6291 return 0; 6292 6293 rcu_read_lock(); 6294 len = 14 + 6295 strlen(clp->cl_rpcclient->cl_nodename) + 6296 1 + 6297 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6298 1; 6299 rcu_read_unlock(); 6300 6301 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6302 if (buflen) 6303 len += buflen + 1; 6304 6305 if (len > NFS4_OPAQUE_LIMIT + 1) 6306 return -EINVAL; 6307 6308 /* 6309 * Since this string is allocated at mount time, and held until the 6310 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6311 * about a memory-reclaim deadlock. 6312 */ 6313 str = kmalloc(len, GFP_KERNEL); 6314 if (!str) 6315 return -ENOMEM; 6316 6317 rcu_read_lock(); 6318 if (buflen) 6319 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6320 clp->cl_rpcclient->cl_nodename, buf, 6321 rpc_peeraddr2str(clp->cl_rpcclient, 6322 RPC_DISPLAY_ADDR)); 6323 else 6324 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6325 clp->cl_rpcclient->cl_nodename, 6326 rpc_peeraddr2str(clp->cl_rpcclient, 6327 RPC_DISPLAY_ADDR)); 6328 rcu_read_unlock(); 6329 6330 clp->cl_owner_id = str; 6331 return 0; 6332 } 6333 6334 static int 6335 nfs4_init_uniform_client_string(struct nfs_client *clp) 6336 { 6337 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6338 size_t buflen; 6339 size_t len; 6340 char *str; 6341 6342 if (clp->cl_owner_id != NULL) 6343 return 0; 6344 6345 len = 10 + 10 + 1 + 10 + 1 + 6346 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6347 6348 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6349 if (buflen) 6350 len += buflen + 1; 6351 6352 if (len > NFS4_OPAQUE_LIMIT + 1) 6353 return -EINVAL; 6354 6355 /* 6356 * Since this string is allocated at mount time, and held until the 6357 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6358 * about a memory-reclaim deadlock. 6359 */ 6360 str = kmalloc(len, GFP_KERNEL); 6361 if (!str) 6362 return -ENOMEM; 6363 6364 if (buflen) 6365 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6366 clp->rpc_ops->version, clp->cl_minorversion, 6367 buf, clp->cl_rpcclient->cl_nodename); 6368 else 6369 scnprintf(str, len, "Linux NFSv%u.%u %s", 6370 clp->rpc_ops->version, clp->cl_minorversion, 6371 clp->cl_rpcclient->cl_nodename); 6372 clp->cl_owner_id = str; 6373 return 0; 6374 } 6375 6376 /* 6377 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6378 * services. Advertise one based on the address family of the 6379 * clientaddr. 6380 */ 6381 static unsigned int 6382 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6383 { 6384 if (strchr(clp->cl_ipaddr, ':') != NULL) 6385 return scnprintf(buf, len, "tcp6"); 6386 else 6387 return scnprintf(buf, len, "tcp"); 6388 } 6389 6390 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6391 { 6392 struct nfs4_setclientid *sc = calldata; 6393 6394 if (task->tk_status == 0) 6395 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6396 } 6397 6398 static const struct rpc_call_ops nfs4_setclientid_ops = { 6399 .rpc_call_done = nfs4_setclientid_done, 6400 }; 6401 6402 /** 6403 * nfs4_proc_setclientid - Negotiate client ID 6404 * @clp: state data structure 6405 * @program: RPC program for NFSv4 callback service 6406 * @port: IP port number for NFS4 callback service 6407 * @cred: credential to use for this call 6408 * @res: where to place the result 6409 * 6410 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6411 */ 6412 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6413 unsigned short port, const struct cred *cred, 6414 struct nfs4_setclientid_res *res) 6415 { 6416 nfs4_verifier sc_verifier; 6417 struct nfs4_setclientid setclientid = { 6418 .sc_verifier = &sc_verifier, 6419 .sc_prog = program, 6420 .sc_clnt = clp, 6421 }; 6422 struct rpc_message msg = { 6423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6424 .rpc_argp = &setclientid, 6425 .rpc_resp = res, 6426 .rpc_cred = cred, 6427 }; 6428 struct rpc_task_setup task_setup_data = { 6429 .rpc_client = clp->cl_rpcclient, 6430 .rpc_message = &msg, 6431 .callback_ops = &nfs4_setclientid_ops, 6432 .callback_data = &setclientid, 6433 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6434 }; 6435 unsigned long now = jiffies; 6436 int status; 6437 6438 /* nfs_client_id4 */ 6439 nfs4_init_boot_verifier(clp, &sc_verifier); 6440 6441 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6442 status = nfs4_init_uniform_client_string(clp); 6443 else 6444 status = nfs4_init_nonuniform_client_string(clp); 6445 6446 if (status) 6447 goto out; 6448 6449 /* cb_client4 */ 6450 setclientid.sc_netid_len = 6451 nfs4_init_callback_netid(clp, 6452 setclientid.sc_netid, 6453 sizeof(setclientid.sc_netid)); 6454 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6455 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6456 clp->cl_ipaddr, port >> 8, port & 255); 6457 6458 dprintk("NFS call setclientid auth=%s, '%s'\n", 6459 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6460 clp->cl_owner_id); 6461 6462 status = nfs4_call_sync_custom(&task_setup_data); 6463 if (setclientid.sc_cred) { 6464 kfree(clp->cl_acceptor); 6465 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6466 put_rpccred(setclientid.sc_cred); 6467 } 6468 6469 if (status == 0) 6470 do_renew_lease(clp, now); 6471 out: 6472 trace_nfs4_setclientid(clp, status); 6473 dprintk("NFS reply setclientid: %d\n", status); 6474 return status; 6475 } 6476 6477 /** 6478 * nfs4_proc_setclientid_confirm - Confirm client ID 6479 * @clp: state data structure 6480 * @arg: result of a previous SETCLIENTID 6481 * @cred: credential to use for this call 6482 * 6483 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6484 */ 6485 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6486 struct nfs4_setclientid_res *arg, 6487 const struct cred *cred) 6488 { 6489 struct rpc_message msg = { 6490 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6491 .rpc_argp = arg, 6492 .rpc_cred = cred, 6493 }; 6494 int status; 6495 6496 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6497 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6498 clp->cl_clientid); 6499 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6500 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6501 trace_nfs4_setclientid_confirm(clp, status); 6502 dprintk("NFS reply setclientid_confirm: %d\n", status); 6503 return status; 6504 } 6505 6506 struct nfs4_delegreturndata { 6507 struct nfs4_delegreturnargs args; 6508 struct nfs4_delegreturnres res; 6509 struct nfs_fh fh; 6510 nfs4_stateid stateid; 6511 unsigned long timestamp; 6512 struct { 6513 struct nfs4_layoutreturn_args arg; 6514 struct nfs4_layoutreturn_res res; 6515 struct nfs4_xdr_opaque_data ld_private; 6516 u32 roc_barrier; 6517 bool roc; 6518 } lr; 6519 struct nfs_fattr fattr; 6520 int rpc_status; 6521 struct inode *inode; 6522 }; 6523 6524 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6525 { 6526 struct nfs4_delegreturndata *data = calldata; 6527 struct nfs4_exception exception = { 6528 .inode = data->inode, 6529 .stateid = &data->stateid, 6530 .task_is_privileged = data->args.seq_args.sa_privileged, 6531 }; 6532 6533 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6534 return; 6535 6536 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6537 6538 /* Handle Layoutreturn errors */ 6539 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6540 &data->res.lr_ret) == -EAGAIN) 6541 goto out_restart; 6542 6543 switch (task->tk_status) { 6544 case 0: 6545 renew_lease(data->res.server, data->timestamp); 6546 break; 6547 case -NFS4ERR_ADMIN_REVOKED: 6548 case -NFS4ERR_DELEG_REVOKED: 6549 case -NFS4ERR_EXPIRED: 6550 nfs4_free_revoked_stateid(data->res.server, 6551 data->args.stateid, 6552 task->tk_msg.rpc_cred); 6553 fallthrough; 6554 case -NFS4ERR_BAD_STATEID: 6555 case -NFS4ERR_STALE_STATEID: 6556 case -ETIMEDOUT: 6557 task->tk_status = 0; 6558 break; 6559 case -NFS4ERR_OLD_STATEID: 6560 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6561 nfs4_stateid_seqid_inc(&data->stateid); 6562 if (data->args.bitmask) { 6563 data->args.bitmask = NULL; 6564 data->res.fattr = NULL; 6565 } 6566 goto out_restart; 6567 case -NFS4ERR_ACCESS: 6568 if (data->args.bitmask) { 6569 data->args.bitmask = NULL; 6570 data->res.fattr = NULL; 6571 goto out_restart; 6572 } 6573 fallthrough; 6574 default: 6575 task->tk_status = nfs4_async_handle_exception(task, 6576 data->res.server, task->tk_status, 6577 &exception); 6578 if (exception.retry) 6579 goto out_restart; 6580 } 6581 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6582 data->rpc_status = task->tk_status; 6583 return; 6584 out_restart: 6585 task->tk_status = 0; 6586 rpc_restart_call_prepare(task); 6587 } 6588 6589 static void nfs4_delegreturn_release(void *calldata) 6590 { 6591 struct nfs4_delegreturndata *data = calldata; 6592 struct inode *inode = data->inode; 6593 6594 if (data->lr.roc) 6595 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6596 data->res.lr_ret); 6597 if (inode) { 6598 nfs4_fattr_set_prechange(&data->fattr, 6599 inode_peek_iversion_raw(inode)); 6600 nfs_refresh_inode(inode, &data->fattr); 6601 nfs_iput_and_deactive(inode); 6602 } 6603 kfree(calldata); 6604 } 6605 6606 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6607 { 6608 struct nfs4_delegreturndata *d_data; 6609 struct pnfs_layout_hdr *lo; 6610 6611 d_data = data; 6612 6613 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6614 nfs4_sequence_done(task, &d_data->res.seq_res); 6615 return; 6616 } 6617 6618 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6619 if (lo && !pnfs_layout_is_valid(lo)) { 6620 d_data->args.lr_args = NULL; 6621 d_data->res.lr_res = NULL; 6622 } 6623 6624 nfs4_setup_sequence(d_data->res.server->nfs_client, 6625 &d_data->args.seq_args, 6626 &d_data->res.seq_res, 6627 task); 6628 } 6629 6630 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6631 .rpc_call_prepare = nfs4_delegreturn_prepare, 6632 .rpc_call_done = nfs4_delegreturn_done, 6633 .rpc_release = nfs4_delegreturn_release, 6634 }; 6635 6636 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6637 { 6638 struct nfs4_delegreturndata *data; 6639 struct nfs_server *server = NFS_SERVER(inode); 6640 struct rpc_task *task; 6641 struct rpc_message msg = { 6642 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6643 .rpc_cred = cred, 6644 }; 6645 struct rpc_task_setup task_setup_data = { 6646 .rpc_client = server->client, 6647 .rpc_message = &msg, 6648 .callback_ops = &nfs4_delegreturn_ops, 6649 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6650 }; 6651 int status = 0; 6652 6653 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6654 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6655 6656 data = kzalloc(sizeof(*data), GFP_KERNEL); 6657 if (data == NULL) 6658 return -ENOMEM; 6659 6660 nfs4_state_protect(server->nfs_client, 6661 NFS_SP4_MACH_CRED_CLEANUP, 6662 &task_setup_data.rpc_client, &msg); 6663 6664 data->args.fhandle = &data->fh; 6665 data->args.stateid = &data->stateid; 6666 nfs4_bitmask_set(data->args.bitmask_store, 6667 server->cache_consistency_bitmask, inode, 0); 6668 data->args.bitmask = data->args.bitmask_store; 6669 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6670 nfs4_stateid_copy(&data->stateid, stateid); 6671 data->res.fattr = &data->fattr; 6672 data->res.server = server; 6673 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6674 data->lr.arg.ld_private = &data->lr.ld_private; 6675 nfs_fattr_init(data->res.fattr); 6676 data->timestamp = jiffies; 6677 data->rpc_status = 0; 6678 data->inode = nfs_igrab_and_active(inode); 6679 if (data->inode || issync) { 6680 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6681 cred); 6682 if (data->lr.roc) { 6683 data->args.lr_args = &data->lr.arg; 6684 data->res.lr_res = &data->lr.res; 6685 } 6686 } 6687 6688 if (!data->inode) 6689 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6690 1); 6691 else 6692 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6693 0); 6694 task_setup_data.callback_data = data; 6695 msg.rpc_argp = &data->args; 6696 msg.rpc_resp = &data->res; 6697 task = rpc_run_task(&task_setup_data); 6698 if (IS_ERR(task)) 6699 return PTR_ERR(task); 6700 if (!issync) 6701 goto out; 6702 status = rpc_wait_for_completion_task(task); 6703 if (status != 0) 6704 goto out; 6705 status = data->rpc_status; 6706 out: 6707 rpc_put_task(task); 6708 return status; 6709 } 6710 6711 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6712 { 6713 struct nfs_server *server = NFS_SERVER(inode); 6714 struct nfs4_exception exception = { }; 6715 int err; 6716 do { 6717 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6718 trace_nfs4_delegreturn(inode, stateid, err); 6719 switch (err) { 6720 case -NFS4ERR_STALE_STATEID: 6721 case -NFS4ERR_EXPIRED: 6722 case 0: 6723 return 0; 6724 } 6725 err = nfs4_handle_exception(server, err, &exception); 6726 } while (exception.retry); 6727 return err; 6728 } 6729 6730 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6731 { 6732 struct inode *inode = state->inode; 6733 struct nfs_server *server = NFS_SERVER(inode); 6734 struct nfs_client *clp = server->nfs_client; 6735 struct nfs_lockt_args arg = { 6736 .fh = NFS_FH(inode), 6737 .fl = request, 6738 }; 6739 struct nfs_lockt_res res = { 6740 .denied = request, 6741 }; 6742 struct rpc_message msg = { 6743 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6744 .rpc_argp = &arg, 6745 .rpc_resp = &res, 6746 .rpc_cred = state->owner->so_cred, 6747 }; 6748 struct nfs4_lock_state *lsp; 6749 int status; 6750 6751 arg.lock_owner.clientid = clp->cl_clientid; 6752 status = nfs4_set_lock_state(state, request); 6753 if (status != 0) 6754 goto out; 6755 lsp = request->fl_u.nfs4_fl.owner; 6756 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6757 arg.lock_owner.s_dev = server->s_dev; 6758 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6759 switch (status) { 6760 case 0: 6761 request->fl_type = F_UNLCK; 6762 break; 6763 case -NFS4ERR_DENIED: 6764 status = 0; 6765 } 6766 request->fl_ops->fl_release_private(request); 6767 request->fl_ops = NULL; 6768 out: 6769 return status; 6770 } 6771 6772 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6773 { 6774 struct nfs4_exception exception = { 6775 .interruptible = true, 6776 }; 6777 int err; 6778 6779 do { 6780 err = _nfs4_proc_getlk(state, cmd, request); 6781 trace_nfs4_get_lock(request, state, cmd, err); 6782 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6783 &exception); 6784 } while (exception.retry); 6785 return err; 6786 } 6787 6788 /* 6789 * Update the seqid of a lock stateid after receiving 6790 * NFS4ERR_OLD_STATEID 6791 */ 6792 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6793 struct nfs4_lock_state *lsp) 6794 { 6795 struct nfs4_state *state = lsp->ls_state; 6796 bool ret = false; 6797 6798 spin_lock(&state->state_lock); 6799 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6800 goto out; 6801 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6802 nfs4_stateid_seqid_inc(dst); 6803 else 6804 dst->seqid = lsp->ls_stateid.seqid; 6805 ret = true; 6806 out: 6807 spin_unlock(&state->state_lock); 6808 return ret; 6809 } 6810 6811 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6812 struct nfs4_lock_state *lsp) 6813 { 6814 struct nfs4_state *state = lsp->ls_state; 6815 bool ret; 6816 6817 spin_lock(&state->state_lock); 6818 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6819 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6820 spin_unlock(&state->state_lock); 6821 return ret; 6822 } 6823 6824 struct nfs4_unlockdata { 6825 struct nfs_locku_args arg; 6826 struct nfs_locku_res res; 6827 struct nfs4_lock_state *lsp; 6828 struct nfs_open_context *ctx; 6829 struct nfs_lock_context *l_ctx; 6830 struct file_lock fl; 6831 struct nfs_server *server; 6832 unsigned long timestamp; 6833 }; 6834 6835 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6836 struct nfs_open_context *ctx, 6837 struct nfs4_lock_state *lsp, 6838 struct nfs_seqid *seqid) 6839 { 6840 struct nfs4_unlockdata *p; 6841 struct nfs4_state *state = lsp->ls_state; 6842 struct inode *inode = state->inode; 6843 6844 p = kzalloc(sizeof(*p), GFP_KERNEL); 6845 if (p == NULL) 6846 return NULL; 6847 p->arg.fh = NFS_FH(inode); 6848 p->arg.fl = &p->fl; 6849 p->arg.seqid = seqid; 6850 p->res.seqid = seqid; 6851 p->lsp = lsp; 6852 /* Ensure we don't close file until we're done freeing locks! */ 6853 p->ctx = get_nfs_open_context(ctx); 6854 p->l_ctx = nfs_get_lock_context(ctx); 6855 locks_init_lock(&p->fl); 6856 locks_copy_lock(&p->fl, fl); 6857 p->server = NFS_SERVER(inode); 6858 spin_lock(&state->state_lock); 6859 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6860 spin_unlock(&state->state_lock); 6861 return p; 6862 } 6863 6864 static void nfs4_locku_release_calldata(void *data) 6865 { 6866 struct nfs4_unlockdata *calldata = data; 6867 nfs_free_seqid(calldata->arg.seqid); 6868 nfs4_put_lock_state(calldata->lsp); 6869 nfs_put_lock_context(calldata->l_ctx); 6870 put_nfs_open_context(calldata->ctx); 6871 kfree(calldata); 6872 } 6873 6874 static void nfs4_locku_done(struct rpc_task *task, void *data) 6875 { 6876 struct nfs4_unlockdata *calldata = data; 6877 struct nfs4_exception exception = { 6878 .inode = calldata->lsp->ls_state->inode, 6879 .stateid = &calldata->arg.stateid, 6880 }; 6881 6882 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6883 return; 6884 switch (task->tk_status) { 6885 case 0: 6886 renew_lease(calldata->server, calldata->timestamp); 6887 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6888 if (nfs4_update_lock_stateid(calldata->lsp, 6889 &calldata->res.stateid)) 6890 break; 6891 fallthrough; 6892 case -NFS4ERR_ADMIN_REVOKED: 6893 case -NFS4ERR_EXPIRED: 6894 nfs4_free_revoked_stateid(calldata->server, 6895 &calldata->arg.stateid, 6896 task->tk_msg.rpc_cred); 6897 fallthrough; 6898 case -NFS4ERR_BAD_STATEID: 6899 case -NFS4ERR_STALE_STATEID: 6900 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6901 calldata->lsp)) 6902 rpc_restart_call_prepare(task); 6903 break; 6904 case -NFS4ERR_OLD_STATEID: 6905 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6906 calldata->lsp)) 6907 rpc_restart_call_prepare(task); 6908 break; 6909 default: 6910 task->tk_status = nfs4_async_handle_exception(task, 6911 calldata->server, task->tk_status, 6912 &exception); 6913 if (exception.retry) 6914 rpc_restart_call_prepare(task); 6915 } 6916 nfs_release_seqid(calldata->arg.seqid); 6917 } 6918 6919 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6920 { 6921 struct nfs4_unlockdata *calldata = data; 6922 6923 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6924 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6925 return; 6926 6927 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6928 goto out_wait; 6929 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6930 /* Note: exit _without_ running nfs4_locku_done */ 6931 goto out_no_action; 6932 } 6933 calldata->timestamp = jiffies; 6934 if (nfs4_setup_sequence(calldata->server->nfs_client, 6935 &calldata->arg.seq_args, 6936 &calldata->res.seq_res, 6937 task) != 0) 6938 nfs_release_seqid(calldata->arg.seqid); 6939 return; 6940 out_no_action: 6941 task->tk_action = NULL; 6942 out_wait: 6943 nfs4_sequence_done(task, &calldata->res.seq_res); 6944 } 6945 6946 static const struct rpc_call_ops nfs4_locku_ops = { 6947 .rpc_call_prepare = nfs4_locku_prepare, 6948 .rpc_call_done = nfs4_locku_done, 6949 .rpc_release = nfs4_locku_release_calldata, 6950 }; 6951 6952 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6953 struct nfs_open_context *ctx, 6954 struct nfs4_lock_state *lsp, 6955 struct nfs_seqid *seqid) 6956 { 6957 struct nfs4_unlockdata *data; 6958 struct rpc_message msg = { 6959 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6960 .rpc_cred = ctx->cred, 6961 }; 6962 struct rpc_task_setup task_setup_data = { 6963 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6964 .rpc_message = &msg, 6965 .callback_ops = &nfs4_locku_ops, 6966 .workqueue = nfsiod_workqueue, 6967 .flags = RPC_TASK_ASYNC, 6968 }; 6969 6970 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6971 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6972 6973 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6974 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6975 6976 /* Ensure this is an unlock - when canceling a lock, the 6977 * canceled lock is passed in, and it won't be an unlock. 6978 */ 6979 fl->fl_type = F_UNLCK; 6980 if (fl->fl_flags & FL_CLOSE) 6981 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6982 6983 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6984 if (data == NULL) { 6985 nfs_free_seqid(seqid); 6986 return ERR_PTR(-ENOMEM); 6987 } 6988 6989 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6990 msg.rpc_argp = &data->arg; 6991 msg.rpc_resp = &data->res; 6992 task_setup_data.callback_data = data; 6993 return rpc_run_task(&task_setup_data); 6994 } 6995 6996 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6997 { 6998 struct inode *inode = state->inode; 6999 struct nfs4_state_owner *sp = state->owner; 7000 struct nfs_inode *nfsi = NFS_I(inode); 7001 struct nfs_seqid *seqid; 7002 struct nfs4_lock_state *lsp; 7003 struct rpc_task *task; 7004 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7005 int status = 0; 7006 unsigned char fl_flags = request->fl_flags; 7007 7008 status = nfs4_set_lock_state(state, request); 7009 /* Unlock _before_ we do the RPC call */ 7010 request->fl_flags |= FL_EXISTS; 7011 /* Exclude nfs_delegation_claim_locks() */ 7012 mutex_lock(&sp->so_delegreturn_mutex); 7013 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7014 down_read(&nfsi->rwsem); 7015 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7016 up_read(&nfsi->rwsem); 7017 mutex_unlock(&sp->so_delegreturn_mutex); 7018 goto out; 7019 } 7020 up_read(&nfsi->rwsem); 7021 mutex_unlock(&sp->so_delegreturn_mutex); 7022 if (status != 0) 7023 goto out; 7024 /* Is this a delegated lock? */ 7025 lsp = request->fl_u.nfs4_fl.owner; 7026 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7027 goto out; 7028 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7029 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7030 status = -ENOMEM; 7031 if (IS_ERR(seqid)) 7032 goto out; 7033 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7034 status = PTR_ERR(task); 7035 if (IS_ERR(task)) 7036 goto out; 7037 status = rpc_wait_for_completion_task(task); 7038 rpc_put_task(task); 7039 out: 7040 request->fl_flags = fl_flags; 7041 trace_nfs4_unlock(request, state, F_SETLK, status); 7042 return status; 7043 } 7044 7045 struct nfs4_lockdata { 7046 struct nfs_lock_args arg; 7047 struct nfs_lock_res res; 7048 struct nfs4_lock_state *lsp; 7049 struct nfs_open_context *ctx; 7050 struct file_lock fl; 7051 unsigned long timestamp; 7052 int rpc_status; 7053 int cancelled; 7054 struct nfs_server *server; 7055 }; 7056 7057 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7058 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7059 gfp_t gfp_mask) 7060 { 7061 struct nfs4_lockdata *p; 7062 struct inode *inode = lsp->ls_state->inode; 7063 struct nfs_server *server = NFS_SERVER(inode); 7064 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7065 7066 p = kzalloc(sizeof(*p), gfp_mask); 7067 if (p == NULL) 7068 return NULL; 7069 7070 p->arg.fh = NFS_FH(inode); 7071 p->arg.fl = &p->fl; 7072 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7073 if (IS_ERR(p->arg.open_seqid)) 7074 goto out_free; 7075 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7076 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7077 if (IS_ERR(p->arg.lock_seqid)) 7078 goto out_free_seqid; 7079 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7080 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7081 p->arg.lock_owner.s_dev = server->s_dev; 7082 p->res.lock_seqid = p->arg.lock_seqid; 7083 p->lsp = lsp; 7084 p->server = server; 7085 p->ctx = get_nfs_open_context(ctx); 7086 locks_init_lock(&p->fl); 7087 locks_copy_lock(&p->fl, fl); 7088 return p; 7089 out_free_seqid: 7090 nfs_free_seqid(p->arg.open_seqid); 7091 out_free: 7092 kfree(p); 7093 return NULL; 7094 } 7095 7096 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7097 { 7098 struct nfs4_lockdata *data = calldata; 7099 struct nfs4_state *state = data->lsp->ls_state; 7100 7101 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7102 goto out_wait; 7103 /* Do we need to do an open_to_lock_owner? */ 7104 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7105 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7106 goto out_release_lock_seqid; 7107 } 7108 nfs4_stateid_copy(&data->arg.open_stateid, 7109 &state->open_stateid); 7110 data->arg.new_lock_owner = 1; 7111 data->res.open_seqid = data->arg.open_seqid; 7112 } else { 7113 data->arg.new_lock_owner = 0; 7114 nfs4_stateid_copy(&data->arg.lock_stateid, 7115 &data->lsp->ls_stateid); 7116 } 7117 if (!nfs4_valid_open_stateid(state)) { 7118 data->rpc_status = -EBADF; 7119 task->tk_action = NULL; 7120 goto out_release_open_seqid; 7121 } 7122 data->timestamp = jiffies; 7123 if (nfs4_setup_sequence(data->server->nfs_client, 7124 &data->arg.seq_args, 7125 &data->res.seq_res, 7126 task) == 0) 7127 return; 7128 out_release_open_seqid: 7129 nfs_release_seqid(data->arg.open_seqid); 7130 out_release_lock_seqid: 7131 nfs_release_seqid(data->arg.lock_seqid); 7132 out_wait: 7133 nfs4_sequence_done(task, &data->res.seq_res); 7134 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7135 } 7136 7137 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7138 { 7139 struct nfs4_lockdata *data = calldata; 7140 struct nfs4_lock_state *lsp = data->lsp; 7141 struct nfs_server *server = NFS_SERVER(d_inode(data->ctx->dentry)); 7142 7143 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7144 return; 7145 7146 data->rpc_status = task->tk_status; 7147 switch (task->tk_status) { 7148 case 0: 7149 renew_lease(server, data->timestamp); 7150 if (data->arg.new_lock && !data->cancelled) { 7151 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7152 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7153 goto out_restart; 7154 } 7155 if (data->arg.new_lock_owner != 0) { 7156 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7157 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7158 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7159 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7160 goto out_restart; 7161 break; 7162 case -NFS4ERR_BAD_STATEID: 7163 case -NFS4ERR_OLD_STATEID: 7164 case -NFS4ERR_STALE_STATEID: 7165 case -NFS4ERR_EXPIRED: 7166 if (data->arg.new_lock_owner != 0) { 7167 if (!nfs4_stateid_match(&data->arg.open_stateid, 7168 &lsp->ls_state->open_stateid)) 7169 goto out_restart; 7170 else if (nfs4_async_handle_error(task, server, lsp->ls_state, NULL) == -EAGAIN) 7171 goto out_restart; 7172 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7173 &lsp->ls_stateid)) 7174 goto out_restart; 7175 } 7176 out_done: 7177 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7178 return; 7179 out_restart: 7180 if (!data->cancelled) 7181 rpc_restart_call_prepare(task); 7182 goto out_done; 7183 } 7184 7185 static void nfs4_lock_release(void *calldata) 7186 { 7187 struct nfs4_lockdata *data = calldata; 7188 7189 nfs_free_seqid(data->arg.open_seqid); 7190 if (data->cancelled && data->rpc_status == 0) { 7191 struct rpc_task *task; 7192 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7193 data->arg.lock_seqid); 7194 if (!IS_ERR(task)) 7195 rpc_put_task_async(task); 7196 dprintk("%s: cancelling lock!\n", __func__); 7197 } else 7198 nfs_free_seqid(data->arg.lock_seqid); 7199 nfs4_put_lock_state(data->lsp); 7200 put_nfs_open_context(data->ctx); 7201 kfree(data); 7202 } 7203 7204 static const struct rpc_call_ops nfs4_lock_ops = { 7205 .rpc_call_prepare = nfs4_lock_prepare, 7206 .rpc_call_done = nfs4_lock_done, 7207 .rpc_release = nfs4_lock_release, 7208 }; 7209 7210 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7211 { 7212 switch (error) { 7213 case -NFS4ERR_ADMIN_REVOKED: 7214 case -NFS4ERR_EXPIRED: 7215 case -NFS4ERR_BAD_STATEID: 7216 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7217 if (new_lock_owner != 0 || 7218 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7219 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7220 break; 7221 case -NFS4ERR_STALE_STATEID: 7222 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7223 nfs4_schedule_lease_recovery(server->nfs_client); 7224 } 7225 } 7226 7227 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7228 { 7229 struct nfs4_lockdata *data; 7230 struct rpc_task *task; 7231 struct rpc_message msg = { 7232 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7233 .rpc_cred = state->owner->so_cred, 7234 }; 7235 struct rpc_task_setup task_setup_data = { 7236 .rpc_client = NFS_CLIENT(state->inode), 7237 .rpc_message = &msg, 7238 .callback_ops = &nfs4_lock_ops, 7239 .workqueue = nfsiod_workqueue, 7240 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7241 }; 7242 int ret; 7243 7244 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7245 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7246 7247 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7248 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7249 if (data == NULL) 7250 return -ENOMEM; 7251 if (IS_SETLKW(cmd)) 7252 data->arg.block = 1; 7253 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7254 recovery_type > NFS_LOCK_NEW); 7255 msg.rpc_argp = &data->arg; 7256 msg.rpc_resp = &data->res; 7257 task_setup_data.callback_data = data; 7258 if (recovery_type > NFS_LOCK_NEW) { 7259 if (recovery_type == NFS_LOCK_RECLAIM) 7260 data->arg.reclaim = NFS_LOCK_RECLAIM; 7261 } else 7262 data->arg.new_lock = 1; 7263 task = rpc_run_task(&task_setup_data); 7264 if (IS_ERR(task)) 7265 return PTR_ERR(task); 7266 ret = rpc_wait_for_completion_task(task); 7267 if (ret == 0) { 7268 ret = data->rpc_status; 7269 if (ret) 7270 nfs4_handle_setlk_error(data->server, data->lsp, 7271 data->arg.new_lock_owner, ret); 7272 } else 7273 data->cancelled = true; 7274 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7275 rpc_put_task(task); 7276 dprintk("%s: ret = %d\n", __func__, ret); 7277 return ret; 7278 } 7279 7280 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7281 { 7282 struct nfs_server *server = NFS_SERVER(state->inode); 7283 struct nfs4_exception exception = { 7284 .inode = state->inode, 7285 }; 7286 int err; 7287 7288 do { 7289 /* Cache the lock if possible... */ 7290 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7291 return 0; 7292 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7293 if (err != -NFS4ERR_DELAY) 7294 break; 7295 nfs4_handle_exception(server, err, &exception); 7296 } while (exception.retry); 7297 return err; 7298 } 7299 7300 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7301 { 7302 struct nfs_server *server = NFS_SERVER(state->inode); 7303 struct nfs4_exception exception = { 7304 .inode = state->inode, 7305 }; 7306 int err; 7307 7308 err = nfs4_set_lock_state(state, request); 7309 if (err != 0) 7310 return err; 7311 if (!recover_lost_locks) { 7312 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7313 return 0; 7314 } 7315 do { 7316 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7317 return 0; 7318 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7319 switch (err) { 7320 default: 7321 goto out; 7322 case -NFS4ERR_GRACE: 7323 case -NFS4ERR_DELAY: 7324 nfs4_handle_exception(server, err, &exception); 7325 err = 0; 7326 } 7327 } while (exception.retry); 7328 out: 7329 return err; 7330 } 7331 7332 #if defined(CONFIG_NFS_V4_1) 7333 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7334 { 7335 struct nfs4_lock_state *lsp; 7336 int status; 7337 7338 status = nfs4_set_lock_state(state, request); 7339 if (status != 0) 7340 return status; 7341 lsp = request->fl_u.nfs4_fl.owner; 7342 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7343 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7344 return 0; 7345 return nfs4_lock_expired(state, request); 7346 } 7347 #endif 7348 7349 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7350 { 7351 struct nfs_inode *nfsi = NFS_I(state->inode); 7352 struct nfs4_state_owner *sp = state->owner; 7353 unsigned char fl_flags = request->fl_flags; 7354 int status; 7355 7356 request->fl_flags |= FL_ACCESS; 7357 status = locks_lock_inode_wait(state->inode, request); 7358 if (status < 0) 7359 goto out; 7360 mutex_lock(&sp->so_delegreturn_mutex); 7361 down_read(&nfsi->rwsem); 7362 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7363 /* Yes: cache locks! */ 7364 /* ...but avoid races with delegation recall... */ 7365 request->fl_flags = fl_flags & ~FL_SLEEP; 7366 status = locks_lock_inode_wait(state->inode, request); 7367 up_read(&nfsi->rwsem); 7368 mutex_unlock(&sp->so_delegreturn_mutex); 7369 goto out; 7370 } 7371 up_read(&nfsi->rwsem); 7372 mutex_unlock(&sp->so_delegreturn_mutex); 7373 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7374 out: 7375 request->fl_flags = fl_flags; 7376 return status; 7377 } 7378 7379 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7380 { 7381 struct nfs4_exception exception = { 7382 .state = state, 7383 .inode = state->inode, 7384 .interruptible = true, 7385 }; 7386 int err; 7387 7388 do { 7389 err = _nfs4_proc_setlk(state, cmd, request); 7390 if (err == -NFS4ERR_DENIED) 7391 err = -EAGAIN; 7392 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7393 err, &exception); 7394 } while (exception.retry); 7395 return err; 7396 } 7397 7398 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7399 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7400 7401 static int 7402 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7403 struct file_lock *request) 7404 { 7405 int status = -ERESTARTSYS; 7406 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7407 7408 while(!signalled()) { 7409 status = nfs4_proc_setlk(state, cmd, request); 7410 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7411 break; 7412 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7413 schedule_timeout(timeout); 7414 timeout *= 2; 7415 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7416 status = -ERESTARTSYS; 7417 } 7418 return status; 7419 } 7420 7421 #ifdef CONFIG_NFS_V4_1 7422 struct nfs4_lock_waiter { 7423 struct inode *inode; 7424 struct nfs_lowner owner; 7425 wait_queue_entry_t wait; 7426 }; 7427 7428 static int 7429 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7430 { 7431 struct nfs4_lock_waiter *waiter = 7432 container_of(wait, struct nfs4_lock_waiter, wait); 7433 7434 /* NULL key means to wake up everyone */ 7435 if (key) { 7436 struct cb_notify_lock_args *cbnl = key; 7437 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7438 *wowner = &waiter->owner; 7439 7440 /* Only wake if the callback was for the same owner. */ 7441 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7442 return 0; 7443 7444 /* Make sure it's for the right inode */ 7445 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7446 return 0; 7447 } 7448 7449 return woken_wake_function(wait, mode, flags, key); 7450 } 7451 7452 static int 7453 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7454 { 7455 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7456 struct nfs_server *server = NFS_SERVER(state->inode); 7457 struct nfs_client *clp = server->nfs_client; 7458 wait_queue_head_t *q = &clp->cl_lock_waitq; 7459 struct nfs4_lock_waiter waiter = { 7460 .inode = state->inode, 7461 .owner = { .clientid = clp->cl_clientid, 7462 .id = lsp->ls_seqid.owner_id, 7463 .s_dev = server->s_dev }, 7464 }; 7465 int status; 7466 7467 /* Don't bother with waitqueue if we don't expect a callback */ 7468 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7469 return nfs4_retry_setlk_simple(state, cmd, request); 7470 7471 init_wait(&waiter.wait); 7472 waiter.wait.func = nfs4_wake_lock_waiter; 7473 add_wait_queue(q, &waiter.wait); 7474 7475 do { 7476 status = nfs4_proc_setlk(state, cmd, request); 7477 if (status != -EAGAIN || IS_SETLK(cmd)) 7478 break; 7479 7480 status = -ERESTARTSYS; 7481 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7482 NFS4_LOCK_MAXTIMEOUT); 7483 } while (!signalled()); 7484 7485 remove_wait_queue(q, &waiter.wait); 7486 7487 return status; 7488 } 7489 #else /* !CONFIG_NFS_V4_1 */ 7490 static inline int 7491 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7492 { 7493 return nfs4_retry_setlk_simple(state, cmd, request); 7494 } 7495 #endif 7496 7497 static int 7498 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7499 { 7500 struct nfs_open_context *ctx; 7501 struct nfs4_state *state; 7502 int status; 7503 7504 /* verify open state */ 7505 ctx = nfs_file_open_context(filp); 7506 state = ctx->state; 7507 7508 if (IS_GETLK(cmd)) { 7509 if (state != NULL) 7510 return nfs4_proc_getlk(state, F_GETLK, request); 7511 return 0; 7512 } 7513 7514 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7515 return -EINVAL; 7516 7517 if (request->fl_type == F_UNLCK) { 7518 if (state != NULL) 7519 return nfs4_proc_unlck(state, cmd, request); 7520 return 0; 7521 } 7522 7523 if (state == NULL) 7524 return -ENOLCK; 7525 7526 if ((request->fl_flags & FL_POSIX) && 7527 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7528 return -ENOLCK; 7529 7530 /* 7531 * Don't rely on the VFS having checked the file open mode, 7532 * since it won't do this for flock() locks. 7533 */ 7534 switch (request->fl_type) { 7535 case F_RDLCK: 7536 if (!(filp->f_mode & FMODE_READ)) 7537 return -EBADF; 7538 break; 7539 case F_WRLCK: 7540 if (!(filp->f_mode & FMODE_WRITE)) 7541 return -EBADF; 7542 } 7543 7544 status = nfs4_set_lock_state(state, request); 7545 if (status != 0) 7546 return status; 7547 7548 return nfs4_retry_setlk(state, cmd, request); 7549 } 7550 7551 static int nfs4_delete_lease(struct file *file, void **priv) 7552 { 7553 return generic_setlease(file, F_UNLCK, NULL, priv); 7554 } 7555 7556 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease, 7557 void **priv) 7558 { 7559 struct inode *inode = file_inode(file); 7560 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7561 int ret; 7562 7563 /* No delegation, no lease */ 7564 if (!nfs4_have_delegation(inode, type)) 7565 return -EAGAIN; 7566 ret = generic_setlease(file, arg, lease, priv); 7567 if (ret || nfs4_have_delegation(inode, type)) 7568 return ret; 7569 /* We raced with a delegation return */ 7570 nfs4_delete_lease(file, priv); 7571 return -EAGAIN; 7572 } 7573 7574 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease, 7575 void **priv) 7576 { 7577 switch (arg) { 7578 case F_RDLCK: 7579 case F_WRLCK: 7580 return nfs4_add_lease(file, arg, lease, priv); 7581 case F_UNLCK: 7582 return nfs4_delete_lease(file, priv); 7583 default: 7584 return -EINVAL; 7585 } 7586 } 7587 7588 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7589 { 7590 struct nfs_server *server = NFS_SERVER(state->inode); 7591 int err; 7592 7593 err = nfs4_set_lock_state(state, fl); 7594 if (err != 0) 7595 return err; 7596 do { 7597 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7598 if (err != -NFS4ERR_DELAY) 7599 break; 7600 ssleep(1); 7601 } while (err == -NFS4ERR_DELAY); 7602 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7603 } 7604 7605 struct nfs_release_lockowner_data { 7606 struct nfs4_lock_state *lsp; 7607 struct nfs_server *server; 7608 struct nfs_release_lockowner_args args; 7609 struct nfs_release_lockowner_res res; 7610 unsigned long timestamp; 7611 }; 7612 7613 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7614 { 7615 struct nfs_release_lockowner_data *data = calldata; 7616 struct nfs_server *server = data->server; 7617 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7618 &data->res.seq_res, task); 7619 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7620 data->timestamp = jiffies; 7621 } 7622 7623 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7624 { 7625 struct nfs_release_lockowner_data *data = calldata; 7626 struct nfs_server *server = data->server; 7627 7628 nfs40_sequence_done(task, &data->res.seq_res); 7629 7630 switch (task->tk_status) { 7631 case 0: 7632 renew_lease(server, data->timestamp); 7633 break; 7634 case -NFS4ERR_STALE_CLIENTID: 7635 case -NFS4ERR_EXPIRED: 7636 nfs4_schedule_lease_recovery(server->nfs_client); 7637 break; 7638 case -NFS4ERR_LEASE_MOVED: 7639 case -NFS4ERR_DELAY: 7640 if (nfs4_async_handle_error(task, server, 7641 NULL, NULL) == -EAGAIN) 7642 rpc_restart_call_prepare(task); 7643 } 7644 } 7645 7646 static void nfs4_release_lockowner_release(void *calldata) 7647 { 7648 struct nfs_release_lockowner_data *data = calldata; 7649 nfs4_free_lock_state(data->server, data->lsp); 7650 kfree(calldata); 7651 } 7652 7653 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7654 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7655 .rpc_call_done = nfs4_release_lockowner_done, 7656 .rpc_release = nfs4_release_lockowner_release, 7657 }; 7658 7659 static void 7660 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7661 { 7662 struct nfs_release_lockowner_data *data; 7663 struct rpc_message msg = { 7664 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7665 }; 7666 7667 if (server->nfs_client->cl_mvops->minor_version != 0) 7668 return; 7669 7670 data = kmalloc(sizeof(*data), GFP_KERNEL); 7671 if (!data) 7672 return; 7673 data->lsp = lsp; 7674 data->server = server; 7675 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7676 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7677 data->args.lock_owner.s_dev = server->s_dev; 7678 7679 msg.rpc_argp = &data->args; 7680 msg.rpc_resp = &data->res; 7681 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7682 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7683 } 7684 7685 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7686 7687 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7688 struct user_namespace *mnt_userns, 7689 struct dentry *unused, struct inode *inode, 7690 const char *key, const void *buf, 7691 size_t buflen, int flags) 7692 { 7693 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7694 } 7695 7696 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7697 struct dentry *unused, struct inode *inode, 7698 const char *key, void *buf, size_t buflen) 7699 { 7700 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7701 } 7702 7703 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7704 { 7705 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7706 } 7707 7708 #if defined(CONFIG_NFS_V4_1) 7709 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7710 7711 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7712 struct user_namespace *mnt_userns, 7713 struct dentry *unused, struct inode *inode, 7714 const char *key, const void *buf, 7715 size_t buflen, int flags) 7716 { 7717 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7718 } 7719 7720 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7721 struct dentry *unused, struct inode *inode, 7722 const char *key, void *buf, size_t buflen) 7723 { 7724 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7725 } 7726 7727 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7728 { 7729 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7730 } 7731 7732 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7733 7734 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7735 struct user_namespace *mnt_userns, 7736 struct dentry *unused, struct inode *inode, 7737 const char *key, const void *buf, 7738 size_t buflen, int flags) 7739 { 7740 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7741 } 7742 7743 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7744 struct dentry *unused, struct inode *inode, 7745 const char *key, void *buf, size_t buflen) 7746 { 7747 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7748 } 7749 7750 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7751 { 7752 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7753 } 7754 7755 #endif 7756 7757 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7758 7759 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7760 struct user_namespace *mnt_userns, 7761 struct dentry *unused, struct inode *inode, 7762 const char *key, const void *buf, 7763 size_t buflen, int flags) 7764 { 7765 if (security_ismaclabel(key)) 7766 return nfs4_set_security_label(inode, buf, buflen); 7767 7768 return -EOPNOTSUPP; 7769 } 7770 7771 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7772 struct dentry *unused, struct inode *inode, 7773 const char *key, void *buf, size_t buflen) 7774 { 7775 if (security_ismaclabel(key)) 7776 return nfs4_get_security_label(inode, buf, buflen); 7777 return -EOPNOTSUPP; 7778 } 7779 7780 static ssize_t 7781 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7782 { 7783 int len = 0; 7784 7785 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7786 len = security_inode_listsecurity(inode, list, list_len); 7787 if (len >= 0 && list_len && len > list_len) 7788 return -ERANGE; 7789 } 7790 return len; 7791 } 7792 7793 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7794 .prefix = XATTR_SECURITY_PREFIX, 7795 .get = nfs4_xattr_get_nfs4_label, 7796 .set = nfs4_xattr_set_nfs4_label, 7797 }; 7798 7799 #else 7800 7801 static ssize_t 7802 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7803 { 7804 return 0; 7805 } 7806 7807 #endif 7808 7809 #ifdef CONFIG_NFS_V4_2 7810 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7811 struct user_namespace *mnt_userns, 7812 struct dentry *unused, struct inode *inode, 7813 const char *key, const void *buf, 7814 size_t buflen, int flags) 7815 { 7816 u32 mask; 7817 int ret; 7818 7819 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7820 return -EOPNOTSUPP; 7821 7822 /* 7823 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7824 * flags right now. Handling of xattr operations use the normal 7825 * file read/write permissions. 7826 * 7827 * Just in case the server has other ideas (which RFC 8276 allows), 7828 * do a cached access check for the XA* flags to possibly avoid 7829 * doing an RPC and getting EACCES back. 7830 */ 7831 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7832 if (!(mask & NFS_ACCESS_XAWRITE)) 7833 return -EACCES; 7834 } 7835 7836 if (buf == NULL) { 7837 ret = nfs42_proc_removexattr(inode, key); 7838 if (!ret) 7839 nfs4_xattr_cache_remove(inode, key); 7840 } else { 7841 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7842 if (!ret) 7843 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7844 } 7845 7846 return ret; 7847 } 7848 7849 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7850 struct dentry *unused, struct inode *inode, 7851 const char *key, void *buf, size_t buflen) 7852 { 7853 u32 mask; 7854 ssize_t ret; 7855 7856 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7857 return -EOPNOTSUPP; 7858 7859 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7860 if (!(mask & NFS_ACCESS_XAREAD)) 7861 return -EACCES; 7862 } 7863 7864 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7865 if (ret) 7866 return ret; 7867 7868 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7869 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7870 return ret; 7871 7872 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7873 7874 return ret; 7875 } 7876 7877 static ssize_t 7878 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7879 { 7880 u64 cookie; 7881 bool eof; 7882 ssize_t ret, size; 7883 char *buf; 7884 size_t buflen; 7885 u32 mask; 7886 7887 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7888 return 0; 7889 7890 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7891 if (!(mask & NFS_ACCESS_XALIST)) 7892 return 0; 7893 } 7894 7895 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7896 if (ret) 7897 return ret; 7898 7899 ret = nfs4_xattr_cache_list(inode, list, list_len); 7900 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7901 return ret; 7902 7903 cookie = 0; 7904 eof = false; 7905 buflen = list_len ? list_len : XATTR_LIST_MAX; 7906 buf = list_len ? list : NULL; 7907 size = 0; 7908 7909 while (!eof) { 7910 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7911 &cookie, &eof); 7912 if (ret < 0) 7913 return ret; 7914 7915 if (list_len) { 7916 buf += ret; 7917 buflen -= ret; 7918 } 7919 size += ret; 7920 } 7921 7922 if (list_len) 7923 nfs4_xattr_cache_set_list(inode, list, size); 7924 7925 return size; 7926 } 7927 7928 #else 7929 7930 static ssize_t 7931 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7932 { 7933 return 0; 7934 } 7935 #endif /* CONFIG_NFS_V4_2 */ 7936 7937 /* 7938 * nfs_fhget will use either the mounted_on_fileid or the fileid 7939 */ 7940 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7941 { 7942 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7943 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7944 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7945 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7946 return; 7947 7948 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7949 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7950 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7951 fattr->nlink = 2; 7952 } 7953 7954 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7955 const struct qstr *name, 7956 struct nfs4_fs_locations *fs_locations, 7957 struct page *page) 7958 { 7959 struct nfs_server *server = NFS_SERVER(dir); 7960 u32 bitmask[3]; 7961 struct nfs4_fs_locations_arg args = { 7962 .dir_fh = NFS_FH(dir), 7963 .name = name, 7964 .page = page, 7965 .bitmask = bitmask, 7966 }; 7967 struct nfs4_fs_locations_res res = { 7968 .fs_locations = fs_locations, 7969 }; 7970 struct rpc_message msg = { 7971 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7972 .rpc_argp = &args, 7973 .rpc_resp = &res, 7974 }; 7975 int status; 7976 7977 dprintk("%s: start\n", __func__); 7978 7979 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7980 bitmask[1] = nfs4_fattr_bitmap[1]; 7981 7982 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7983 * is not supported */ 7984 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7985 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7986 else 7987 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7988 7989 nfs_fattr_init(fs_locations->fattr); 7990 fs_locations->server = server; 7991 fs_locations->nlocations = 0; 7992 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7993 dprintk("%s: returned status = %d\n", __func__, status); 7994 return status; 7995 } 7996 7997 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7998 const struct qstr *name, 7999 struct nfs4_fs_locations *fs_locations, 8000 struct page *page) 8001 { 8002 struct nfs4_exception exception = { 8003 .interruptible = true, 8004 }; 8005 int err; 8006 do { 8007 err = _nfs4_proc_fs_locations(client, dir, name, 8008 fs_locations, page); 8009 trace_nfs4_get_fs_locations(dir, name, err); 8010 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8011 &exception); 8012 } while (exception.retry); 8013 return err; 8014 } 8015 8016 /* 8017 * This operation also signals the server that this client is 8018 * performing migration recovery. The server can stop returning 8019 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8020 * appended to this compound to identify the client ID which is 8021 * performing recovery. 8022 */ 8023 static int _nfs40_proc_get_locations(struct nfs_server *server, 8024 struct nfs_fh *fhandle, 8025 struct nfs4_fs_locations *locations, 8026 struct page *page, const struct cred *cred) 8027 { 8028 struct rpc_clnt *clnt = server->client; 8029 u32 bitmask[2] = { 8030 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8031 }; 8032 struct nfs4_fs_locations_arg args = { 8033 .clientid = server->nfs_client->cl_clientid, 8034 .fh = fhandle, 8035 .page = page, 8036 .bitmask = bitmask, 8037 .migration = 1, /* skip LOOKUP */ 8038 .renew = 1, /* append RENEW */ 8039 }; 8040 struct nfs4_fs_locations_res res = { 8041 .fs_locations = locations, 8042 .migration = 1, 8043 .renew = 1, 8044 }; 8045 struct rpc_message msg = { 8046 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8047 .rpc_argp = &args, 8048 .rpc_resp = &res, 8049 .rpc_cred = cred, 8050 }; 8051 unsigned long now = jiffies; 8052 int status; 8053 8054 nfs_fattr_init(locations->fattr); 8055 locations->server = server; 8056 locations->nlocations = 0; 8057 8058 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8059 status = nfs4_call_sync_sequence(clnt, server, &msg, 8060 &args.seq_args, &res.seq_res); 8061 if (status) 8062 return status; 8063 8064 renew_lease(server, now); 8065 return 0; 8066 } 8067 8068 #ifdef CONFIG_NFS_V4_1 8069 8070 /* 8071 * This operation also signals the server that this client is 8072 * performing migration recovery. The server can stop asserting 8073 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8074 * performing this operation is identified in the SEQUENCE 8075 * operation in this compound. 8076 * 8077 * When the client supports GETATTR(fs_locations_info), it can 8078 * be plumbed in here. 8079 */ 8080 static int _nfs41_proc_get_locations(struct nfs_server *server, 8081 struct nfs_fh *fhandle, 8082 struct nfs4_fs_locations *locations, 8083 struct page *page, const struct cred *cred) 8084 { 8085 struct rpc_clnt *clnt = server->client; 8086 u32 bitmask[2] = { 8087 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8088 }; 8089 struct nfs4_fs_locations_arg args = { 8090 .fh = fhandle, 8091 .page = page, 8092 .bitmask = bitmask, 8093 .migration = 1, /* skip LOOKUP */ 8094 }; 8095 struct nfs4_fs_locations_res res = { 8096 .fs_locations = locations, 8097 .migration = 1, 8098 }; 8099 struct rpc_message msg = { 8100 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8101 .rpc_argp = &args, 8102 .rpc_resp = &res, 8103 .rpc_cred = cred, 8104 }; 8105 struct nfs4_call_sync_data data = { 8106 .seq_server = server, 8107 .seq_args = &args.seq_args, 8108 .seq_res = &res.seq_res, 8109 }; 8110 struct rpc_task_setup task_setup_data = { 8111 .rpc_client = clnt, 8112 .rpc_message = &msg, 8113 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8114 .callback_data = &data, 8115 .flags = RPC_TASK_NO_ROUND_ROBIN, 8116 }; 8117 int status; 8118 8119 nfs_fattr_init(locations->fattr); 8120 locations->server = server; 8121 locations->nlocations = 0; 8122 8123 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8124 status = nfs4_call_sync_custom(&task_setup_data); 8125 if (status == NFS4_OK && 8126 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8127 status = -NFS4ERR_LEASE_MOVED; 8128 return status; 8129 } 8130 8131 #endif /* CONFIG_NFS_V4_1 */ 8132 8133 /** 8134 * nfs4_proc_get_locations - discover locations for a migrated FSID 8135 * @server: pointer to nfs_server to process 8136 * @fhandle: pointer to the kernel NFS client file handle 8137 * @locations: result of query 8138 * @page: buffer 8139 * @cred: credential to use for this operation 8140 * 8141 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8142 * operation failed, or a negative errno if a local error occurred. 8143 * 8144 * On success, "locations" is filled in, but if the server has 8145 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8146 * asserted. 8147 * 8148 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8149 * from this client that require migration recovery. 8150 */ 8151 int nfs4_proc_get_locations(struct nfs_server *server, 8152 struct nfs_fh *fhandle, 8153 struct nfs4_fs_locations *locations, 8154 struct page *page, const struct cred *cred) 8155 { 8156 struct nfs_client *clp = server->nfs_client; 8157 const struct nfs4_mig_recovery_ops *ops = 8158 clp->cl_mvops->mig_recovery_ops; 8159 struct nfs4_exception exception = { 8160 .interruptible = true, 8161 }; 8162 int status; 8163 8164 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8165 (unsigned long long)server->fsid.major, 8166 (unsigned long long)server->fsid.minor, 8167 clp->cl_hostname); 8168 nfs_display_fhandle(fhandle, __func__); 8169 8170 do { 8171 status = ops->get_locations(server, fhandle, locations, page, 8172 cred); 8173 if (status != -NFS4ERR_DELAY) 8174 break; 8175 nfs4_handle_exception(server, status, &exception); 8176 } while (exception.retry); 8177 return status; 8178 } 8179 8180 /* 8181 * This operation also signals the server that this client is 8182 * performing "lease moved" recovery. The server can stop 8183 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8184 * is appended to this compound to identify the client ID which is 8185 * performing recovery. 8186 */ 8187 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8188 { 8189 struct nfs_server *server = NFS_SERVER(inode); 8190 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8191 struct rpc_clnt *clnt = server->client; 8192 struct nfs4_fsid_present_arg args = { 8193 .fh = NFS_FH(inode), 8194 .clientid = clp->cl_clientid, 8195 .renew = 1, /* append RENEW */ 8196 }; 8197 struct nfs4_fsid_present_res res = { 8198 .renew = 1, 8199 }; 8200 struct rpc_message msg = { 8201 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8202 .rpc_argp = &args, 8203 .rpc_resp = &res, 8204 .rpc_cred = cred, 8205 }; 8206 unsigned long now = jiffies; 8207 int status; 8208 8209 res.fh = nfs_alloc_fhandle(); 8210 if (res.fh == NULL) 8211 return -ENOMEM; 8212 8213 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8214 status = nfs4_call_sync_sequence(clnt, server, &msg, 8215 &args.seq_args, &res.seq_res); 8216 nfs_free_fhandle(res.fh); 8217 if (status) 8218 return status; 8219 8220 do_renew_lease(clp, now); 8221 return 0; 8222 } 8223 8224 #ifdef CONFIG_NFS_V4_1 8225 8226 /* 8227 * This operation also signals the server that this client is 8228 * performing "lease moved" recovery. The server can stop asserting 8229 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8230 * this operation is identified in the SEQUENCE operation in this 8231 * compound. 8232 */ 8233 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8234 { 8235 struct nfs_server *server = NFS_SERVER(inode); 8236 struct rpc_clnt *clnt = server->client; 8237 struct nfs4_fsid_present_arg args = { 8238 .fh = NFS_FH(inode), 8239 }; 8240 struct nfs4_fsid_present_res res = { 8241 }; 8242 struct rpc_message msg = { 8243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8244 .rpc_argp = &args, 8245 .rpc_resp = &res, 8246 .rpc_cred = cred, 8247 }; 8248 int status; 8249 8250 res.fh = nfs_alloc_fhandle(); 8251 if (res.fh == NULL) 8252 return -ENOMEM; 8253 8254 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8255 status = nfs4_call_sync_sequence(clnt, server, &msg, 8256 &args.seq_args, &res.seq_res); 8257 nfs_free_fhandle(res.fh); 8258 if (status == NFS4_OK && 8259 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8260 status = -NFS4ERR_LEASE_MOVED; 8261 return status; 8262 } 8263 8264 #endif /* CONFIG_NFS_V4_1 */ 8265 8266 /** 8267 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8268 * @inode: inode on FSID to check 8269 * @cred: credential to use for this operation 8270 * 8271 * Server indicates whether the FSID is present, moved, or not 8272 * recognized. This operation is necessary to clear a LEASE_MOVED 8273 * condition for this client ID. 8274 * 8275 * Returns NFS4_OK if the FSID is present on this server, 8276 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8277 * NFS4ERR code if some error occurred on the server, or a 8278 * negative errno if a local failure occurred. 8279 */ 8280 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8281 { 8282 struct nfs_server *server = NFS_SERVER(inode); 8283 struct nfs_client *clp = server->nfs_client; 8284 const struct nfs4_mig_recovery_ops *ops = 8285 clp->cl_mvops->mig_recovery_ops; 8286 struct nfs4_exception exception = { 8287 .interruptible = true, 8288 }; 8289 int status; 8290 8291 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8292 (unsigned long long)server->fsid.major, 8293 (unsigned long long)server->fsid.minor, 8294 clp->cl_hostname); 8295 nfs_display_fhandle(NFS_FH(inode), __func__); 8296 8297 do { 8298 status = ops->fsid_present(inode, cred); 8299 if (status != -NFS4ERR_DELAY) 8300 break; 8301 nfs4_handle_exception(server, status, &exception); 8302 } while (exception.retry); 8303 return status; 8304 } 8305 8306 /* 8307 * If 'use_integrity' is true and the state managment nfs_client 8308 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8309 * and the machine credential as per RFC3530bis and RFC5661 Security 8310 * Considerations sections. Otherwise, just use the user cred with the 8311 * filesystem's rpc_client. 8312 */ 8313 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8314 { 8315 int status; 8316 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8317 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8318 struct nfs4_secinfo_arg args = { 8319 .dir_fh = NFS_FH(dir), 8320 .name = name, 8321 }; 8322 struct nfs4_secinfo_res res = { 8323 .flavors = flavors, 8324 }; 8325 struct rpc_message msg = { 8326 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8327 .rpc_argp = &args, 8328 .rpc_resp = &res, 8329 }; 8330 struct nfs4_call_sync_data data = { 8331 .seq_server = NFS_SERVER(dir), 8332 .seq_args = &args.seq_args, 8333 .seq_res = &res.seq_res, 8334 }; 8335 struct rpc_task_setup task_setup = { 8336 .rpc_client = clnt, 8337 .rpc_message = &msg, 8338 .callback_ops = clp->cl_mvops->call_sync_ops, 8339 .callback_data = &data, 8340 .flags = RPC_TASK_NO_ROUND_ROBIN, 8341 }; 8342 const struct cred *cred = NULL; 8343 8344 if (use_integrity) { 8345 clnt = clp->cl_rpcclient; 8346 task_setup.rpc_client = clnt; 8347 8348 cred = nfs4_get_clid_cred(clp); 8349 msg.rpc_cred = cred; 8350 } 8351 8352 dprintk("NFS call secinfo %s\n", name->name); 8353 8354 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8355 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8356 status = nfs4_call_sync_custom(&task_setup); 8357 8358 dprintk("NFS reply secinfo: %d\n", status); 8359 8360 put_cred(cred); 8361 return status; 8362 } 8363 8364 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8365 struct nfs4_secinfo_flavors *flavors) 8366 { 8367 struct nfs4_exception exception = { 8368 .interruptible = true, 8369 }; 8370 int err; 8371 do { 8372 err = -NFS4ERR_WRONGSEC; 8373 8374 /* try to use integrity protection with machine cred */ 8375 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8376 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8377 8378 /* 8379 * if unable to use integrity protection, or SECINFO with 8380 * integrity protection returns NFS4ERR_WRONGSEC (which is 8381 * disallowed by spec, but exists in deployed servers) use 8382 * the current filesystem's rpc_client and the user cred. 8383 */ 8384 if (err == -NFS4ERR_WRONGSEC) 8385 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8386 8387 trace_nfs4_secinfo(dir, name, err); 8388 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8389 &exception); 8390 } while (exception.retry); 8391 return err; 8392 } 8393 8394 #ifdef CONFIG_NFS_V4_1 8395 /* 8396 * Check the exchange flags returned by the server for invalid flags, having 8397 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8398 * DS flags set. 8399 */ 8400 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8401 { 8402 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8403 goto out_inval; 8404 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8405 goto out_inval; 8406 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8407 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8408 goto out_inval; 8409 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8410 goto out_inval; 8411 return NFS_OK; 8412 out_inval: 8413 return -NFS4ERR_INVAL; 8414 } 8415 8416 static bool 8417 nfs41_same_server_scope(struct nfs41_server_scope *a, 8418 struct nfs41_server_scope *b) 8419 { 8420 if (a->server_scope_sz != b->server_scope_sz) 8421 return false; 8422 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8423 } 8424 8425 static void 8426 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8427 { 8428 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8429 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8430 struct nfs_client *clp = args->client; 8431 8432 switch (task->tk_status) { 8433 case -NFS4ERR_BADSESSION: 8434 case -NFS4ERR_DEADSESSION: 8435 nfs4_schedule_session_recovery(clp->cl_session, 8436 task->tk_status); 8437 return; 8438 } 8439 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8440 res->dir != NFS4_CDFS4_BOTH) { 8441 rpc_task_close_connection(task); 8442 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8443 rpc_restart_call(task); 8444 } 8445 } 8446 8447 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8448 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8449 }; 8450 8451 /* 8452 * nfs4_proc_bind_one_conn_to_session() 8453 * 8454 * The 4.1 client currently uses the same TCP connection for the 8455 * fore and backchannel. 8456 */ 8457 static 8458 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8459 struct rpc_xprt *xprt, 8460 struct nfs_client *clp, 8461 const struct cred *cred) 8462 { 8463 int status; 8464 struct nfs41_bind_conn_to_session_args args = { 8465 .client = clp, 8466 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8467 .retries = 0, 8468 }; 8469 struct nfs41_bind_conn_to_session_res res; 8470 struct rpc_message msg = { 8471 .rpc_proc = 8472 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8473 .rpc_argp = &args, 8474 .rpc_resp = &res, 8475 .rpc_cred = cred, 8476 }; 8477 struct rpc_task_setup task_setup_data = { 8478 .rpc_client = clnt, 8479 .rpc_xprt = xprt, 8480 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8481 .rpc_message = &msg, 8482 .flags = RPC_TASK_TIMEOUT, 8483 }; 8484 struct rpc_task *task; 8485 8486 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8487 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8488 args.dir = NFS4_CDFC4_FORE; 8489 8490 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8491 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8492 args.dir = NFS4_CDFC4_FORE; 8493 8494 task = rpc_run_task(&task_setup_data); 8495 if (!IS_ERR(task)) { 8496 status = task->tk_status; 8497 rpc_put_task(task); 8498 } else 8499 status = PTR_ERR(task); 8500 trace_nfs4_bind_conn_to_session(clp, status); 8501 if (status == 0) { 8502 if (memcmp(res.sessionid.data, 8503 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8504 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8505 return -EIO; 8506 } 8507 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8508 dprintk("NFS: %s: Unexpected direction from server\n", 8509 __func__); 8510 return -EIO; 8511 } 8512 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8513 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8514 __func__); 8515 return -EIO; 8516 } 8517 } 8518 8519 return status; 8520 } 8521 8522 struct rpc_bind_conn_calldata { 8523 struct nfs_client *clp; 8524 const struct cred *cred; 8525 }; 8526 8527 static int 8528 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8529 struct rpc_xprt *xprt, 8530 void *calldata) 8531 { 8532 struct rpc_bind_conn_calldata *p = calldata; 8533 8534 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8535 } 8536 8537 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8538 { 8539 struct rpc_bind_conn_calldata data = { 8540 .clp = clp, 8541 .cred = cred, 8542 }; 8543 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8544 nfs4_proc_bind_conn_to_session_callback, &data); 8545 } 8546 8547 /* 8548 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8549 * and operations we'd like to see to enable certain features in the allow map 8550 */ 8551 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8552 .how = SP4_MACH_CRED, 8553 .enforce.u.words = { 8554 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8555 1 << (OP_EXCHANGE_ID - 32) | 8556 1 << (OP_CREATE_SESSION - 32) | 8557 1 << (OP_DESTROY_SESSION - 32) | 8558 1 << (OP_DESTROY_CLIENTID - 32) 8559 }, 8560 .allow.u.words = { 8561 [0] = 1 << (OP_CLOSE) | 8562 1 << (OP_OPEN_DOWNGRADE) | 8563 1 << (OP_LOCKU) | 8564 1 << (OP_DELEGRETURN) | 8565 1 << (OP_COMMIT), 8566 [1] = 1 << (OP_SECINFO - 32) | 8567 1 << (OP_SECINFO_NO_NAME - 32) | 8568 1 << (OP_LAYOUTRETURN - 32) | 8569 1 << (OP_TEST_STATEID - 32) | 8570 1 << (OP_FREE_STATEID - 32) | 8571 1 << (OP_WRITE - 32) 8572 } 8573 }; 8574 8575 /* 8576 * Select the state protection mode for client `clp' given the server results 8577 * from exchange_id in `sp'. 8578 * 8579 * Returns 0 on success, negative errno otherwise. 8580 */ 8581 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8582 struct nfs41_state_protection *sp) 8583 { 8584 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8585 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8586 1 << (OP_EXCHANGE_ID - 32) | 8587 1 << (OP_CREATE_SESSION - 32) | 8588 1 << (OP_DESTROY_SESSION - 32) | 8589 1 << (OP_DESTROY_CLIENTID - 32) 8590 }; 8591 unsigned long flags = 0; 8592 unsigned int i; 8593 int ret = 0; 8594 8595 if (sp->how == SP4_MACH_CRED) { 8596 /* Print state protect result */ 8597 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8598 for (i = 0; i <= LAST_NFS4_OP; i++) { 8599 if (test_bit(i, sp->enforce.u.longs)) 8600 dfprintk(MOUNT, " enforce op %d\n", i); 8601 if (test_bit(i, sp->allow.u.longs)) 8602 dfprintk(MOUNT, " allow op %d\n", i); 8603 } 8604 8605 /* make sure nothing is on enforce list that isn't supported */ 8606 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8607 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8608 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8609 ret = -EINVAL; 8610 goto out; 8611 } 8612 } 8613 8614 /* 8615 * Minimal mode - state operations are allowed to use machine 8616 * credential. Note this already happens by default, so the 8617 * client doesn't have to do anything more than the negotiation. 8618 * 8619 * NOTE: we don't care if EXCHANGE_ID is in the list - 8620 * we're already using the machine cred for exchange_id 8621 * and will never use a different cred. 8622 */ 8623 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8624 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8625 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8626 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8627 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8628 dfprintk(MOUNT, " minimal mode enabled\n"); 8629 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8630 } else { 8631 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8632 ret = -EINVAL; 8633 goto out; 8634 } 8635 8636 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8637 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8638 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8639 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8640 dfprintk(MOUNT, " cleanup mode enabled\n"); 8641 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8642 } 8643 8644 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8645 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8646 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8647 } 8648 8649 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8650 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8651 dfprintk(MOUNT, " secinfo mode enabled\n"); 8652 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8653 } 8654 8655 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8656 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8657 dfprintk(MOUNT, " stateid mode enabled\n"); 8658 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8659 } 8660 8661 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8662 dfprintk(MOUNT, " write mode enabled\n"); 8663 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8664 } 8665 8666 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8667 dfprintk(MOUNT, " commit mode enabled\n"); 8668 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8669 } 8670 } 8671 out: 8672 clp->cl_sp4_flags = flags; 8673 return ret; 8674 } 8675 8676 struct nfs41_exchange_id_data { 8677 struct nfs41_exchange_id_res res; 8678 struct nfs41_exchange_id_args args; 8679 }; 8680 8681 static void nfs4_exchange_id_release(void *data) 8682 { 8683 struct nfs41_exchange_id_data *cdata = 8684 (struct nfs41_exchange_id_data *)data; 8685 8686 nfs_put_client(cdata->args.client); 8687 kfree(cdata->res.impl_id); 8688 kfree(cdata->res.server_scope); 8689 kfree(cdata->res.server_owner); 8690 kfree(cdata); 8691 } 8692 8693 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8694 .rpc_release = nfs4_exchange_id_release, 8695 }; 8696 8697 /* 8698 * _nfs4_proc_exchange_id() 8699 * 8700 * Wrapper for EXCHANGE_ID operation. 8701 */ 8702 static struct rpc_task * 8703 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8704 u32 sp4_how, struct rpc_xprt *xprt) 8705 { 8706 struct rpc_message msg = { 8707 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8708 .rpc_cred = cred, 8709 }; 8710 struct rpc_task_setup task_setup_data = { 8711 .rpc_client = clp->cl_rpcclient, 8712 .callback_ops = &nfs4_exchange_id_call_ops, 8713 .rpc_message = &msg, 8714 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8715 }; 8716 struct nfs41_exchange_id_data *calldata; 8717 int status; 8718 8719 if (!refcount_inc_not_zero(&clp->cl_count)) 8720 return ERR_PTR(-EIO); 8721 8722 status = -ENOMEM; 8723 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8724 if (!calldata) 8725 goto out; 8726 8727 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8728 8729 status = nfs4_init_uniform_client_string(clp); 8730 if (status) 8731 goto out_calldata; 8732 8733 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8734 GFP_NOFS); 8735 status = -ENOMEM; 8736 if (unlikely(calldata->res.server_owner == NULL)) 8737 goto out_calldata; 8738 8739 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8740 GFP_NOFS); 8741 if (unlikely(calldata->res.server_scope == NULL)) 8742 goto out_server_owner; 8743 8744 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8745 if (unlikely(calldata->res.impl_id == NULL)) 8746 goto out_server_scope; 8747 8748 switch (sp4_how) { 8749 case SP4_NONE: 8750 calldata->args.state_protect.how = SP4_NONE; 8751 break; 8752 8753 case SP4_MACH_CRED: 8754 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8755 break; 8756 8757 default: 8758 /* unsupported! */ 8759 WARN_ON_ONCE(1); 8760 status = -EINVAL; 8761 goto out_impl_id; 8762 } 8763 if (xprt) { 8764 task_setup_data.rpc_xprt = xprt; 8765 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8766 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8767 sizeof(calldata->args.verifier.data)); 8768 } 8769 calldata->args.client = clp; 8770 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8771 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8772 #ifdef CONFIG_NFS_V4_1_MIGRATION 8773 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8774 #endif 8775 msg.rpc_argp = &calldata->args; 8776 msg.rpc_resp = &calldata->res; 8777 task_setup_data.callback_data = calldata; 8778 8779 return rpc_run_task(&task_setup_data); 8780 8781 out_impl_id: 8782 kfree(calldata->res.impl_id); 8783 out_server_scope: 8784 kfree(calldata->res.server_scope); 8785 out_server_owner: 8786 kfree(calldata->res.server_owner); 8787 out_calldata: 8788 kfree(calldata); 8789 out: 8790 nfs_put_client(clp); 8791 return ERR_PTR(status); 8792 } 8793 8794 /* 8795 * _nfs4_proc_exchange_id() 8796 * 8797 * Wrapper for EXCHANGE_ID operation. 8798 */ 8799 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8800 u32 sp4_how) 8801 { 8802 struct rpc_task *task; 8803 struct nfs41_exchange_id_args *argp; 8804 struct nfs41_exchange_id_res *resp; 8805 unsigned long now = jiffies; 8806 int status; 8807 8808 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8809 if (IS_ERR(task)) 8810 return PTR_ERR(task); 8811 8812 argp = task->tk_msg.rpc_argp; 8813 resp = task->tk_msg.rpc_resp; 8814 status = task->tk_status; 8815 if (status != 0) 8816 goto out; 8817 8818 status = nfs4_check_cl_exchange_flags(resp->flags, 8819 clp->cl_mvops->minor_version); 8820 if (status != 0) 8821 goto out; 8822 8823 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8824 if (status != 0) 8825 goto out; 8826 8827 do_renew_lease(clp, now); 8828 8829 clp->cl_clientid = resp->clientid; 8830 clp->cl_exchange_flags = resp->flags; 8831 clp->cl_seqid = resp->seqid; 8832 /* Client ID is not confirmed */ 8833 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8834 clear_bit(NFS4_SESSION_ESTABLISHED, 8835 &clp->cl_session->session_state); 8836 8837 if (clp->cl_serverscope != NULL && 8838 !nfs41_same_server_scope(clp->cl_serverscope, 8839 resp->server_scope)) { 8840 dprintk("%s: server_scope mismatch detected\n", 8841 __func__); 8842 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8843 } 8844 8845 swap(clp->cl_serverowner, resp->server_owner); 8846 swap(clp->cl_serverscope, resp->server_scope); 8847 swap(clp->cl_implid, resp->impl_id); 8848 8849 /* Save the EXCHANGE_ID verifier session trunk tests */ 8850 memcpy(clp->cl_confirm.data, argp->verifier.data, 8851 sizeof(clp->cl_confirm.data)); 8852 out: 8853 trace_nfs4_exchange_id(clp, status); 8854 rpc_put_task(task); 8855 return status; 8856 } 8857 8858 /* 8859 * nfs4_proc_exchange_id() 8860 * 8861 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8862 * 8863 * Since the clientid has expired, all compounds using sessions 8864 * associated with the stale clientid will be returning 8865 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8866 * be in some phase of session reset. 8867 * 8868 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8869 */ 8870 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8871 { 8872 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8873 int status; 8874 8875 /* try SP4_MACH_CRED if krb5i/p */ 8876 if (authflavor == RPC_AUTH_GSS_KRB5I || 8877 authflavor == RPC_AUTH_GSS_KRB5P) { 8878 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8879 if (!status) 8880 return 0; 8881 } 8882 8883 /* try SP4_NONE */ 8884 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8885 } 8886 8887 /** 8888 * nfs4_test_session_trunk 8889 * 8890 * This is an add_xprt_test() test function called from 8891 * rpc_clnt_setup_test_and_add_xprt. 8892 * 8893 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8894 * and is dereferrenced in nfs4_exchange_id_release 8895 * 8896 * Upon success, add the new transport to the rpc_clnt 8897 * 8898 * @clnt: struct rpc_clnt to get new transport 8899 * @xprt: the rpc_xprt to test 8900 * @data: call data for _nfs4_proc_exchange_id. 8901 */ 8902 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8903 void *data) 8904 { 8905 struct nfs4_add_xprt_data *adata = data; 8906 struct rpc_task *task; 8907 int status; 8908 8909 u32 sp4_how; 8910 8911 dprintk("--> %s try %s\n", __func__, 8912 xprt->address_strings[RPC_DISPLAY_ADDR]); 8913 8914 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8915 8916 /* Test connection for session trunking. Async exchange_id call */ 8917 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8918 if (IS_ERR(task)) 8919 return; 8920 8921 status = task->tk_status; 8922 if (status == 0) 8923 status = nfs4_detect_session_trunking(adata->clp, 8924 task->tk_msg.rpc_resp, xprt); 8925 8926 if (status == 0) 8927 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8928 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8929 (struct sockaddr *)&xprt->addr)) 8930 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8931 8932 rpc_put_task(task); 8933 } 8934 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8935 8936 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8937 const struct cred *cred) 8938 { 8939 struct rpc_message msg = { 8940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8941 .rpc_argp = clp, 8942 .rpc_cred = cred, 8943 }; 8944 int status; 8945 8946 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8947 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8948 trace_nfs4_destroy_clientid(clp, status); 8949 if (status) 8950 dprintk("NFS: Got error %d from the server %s on " 8951 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8952 return status; 8953 } 8954 8955 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8956 const struct cred *cred) 8957 { 8958 unsigned int loop; 8959 int ret; 8960 8961 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8962 ret = _nfs4_proc_destroy_clientid(clp, cred); 8963 switch (ret) { 8964 case -NFS4ERR_DELAY: 8965 case -NFS4ERR_CLIENTID_BUSY: 8966 ssleep(1); 8967 break; 8968 default: 8969 return ret; 8970 } 8971 } 8972 return 0; 8973 } 8974 8975 int nfs4_destroy_clientid(struct nfs_client *clp) 8976 { 8977 const struct cred *cred; 8978 int ret = 0; 8979 8980 if (clp->cl_mvops->minor_version < 1) 8981 goto out; 8982 if (clp->cl_exchange_flags == 0) 8983 goto out; 8984 if (clp->cl_preserve_clid) 8985 goto out; 8986 cred = nfs4_get_clid_cred(clp); 8987 ret = nfs4_proc_destroy_clientid(clp, cred); 8988 put_cred(cred); 8989 switch (ret) { 8990 case 0: 8991 case -NFS4ERR_STALE_CLIENTID: 8992 clp->cl_exchange_flags = 0; 8993 } 8994 out: 8995 return ret; 8996 } 8997 8998 #endif /* CONFIG_NFS_V4_1 */ 8999 9000 struct nfs4_get_lease_time_data { 9001 struct nfs4_get_lease_time_args *args; 9002 struct nfs4_get_lease_time_res *res; 9003 struct nfs_client *clp; 9004 }; 9005 9006 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9007 void *calldata) 9008 { 9009 struct nfs4_get_lease_time_data *data = 9010 (struct nfs4_get_lease_time_data *)calldata; 9011 9012 /* just setup sequence, do not trigger session recovery 9013 since we're invoked within one */ 9014 nfs4_setup_sequence(data->clp, 9015 &data->args->la_seq_args, 9016 &data->res->lr_seq_res, 9017 task); 9018 } 9019 9020 /* 9021 * Called from nfs4_state_manager thread for session setup, so don't recover 9022 * from sequence operation or clientid errors. 9023 */ 9024 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9025 { 9026 struct nfs4_get_lease_time_data *data = 9027 (struct nfs4_get_lease_time_data *)calldata; 9028 9029 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9030 return; 9031 switch (task->tk_status) { 9032 case -NFS4ERR_DELAY: 9033 case -NFS4ERR_GRACE: 9034 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9035 task->tk_status = 0; 9036 fallthrough; 9037 case -NFS4ERR_RETRY_UNCACHED_REP: 9038 rpc_restart_call_prepare(task); 9039 return; 9040 } 9041 } 9042 9043 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9044 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9045 .rpc_call_done = nfs4_get_lease_time_done, 9046 }; 9047 9048 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9049 { 9050 struct nfs4_get_lease_time_args args; 9051 struct nfs4_get_lease_time_res res = { 9052 .lr_fsinfo = fsinfo, 9053 }; 9054 struct nfs4_get_lease_time_data data = { 9055 .args = &args, 9056 .res = &res, 9057 .clp = clp, 9058 }; 9059 struct rpc_message msg = { 9060 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9061 .rpc_argp = &args, 9062 .rpc_resp = &res, 9063 }; 9064 struct rpc_task_setup task_setup = { 9065 .rpc_client = clp->cl_rpcclient, 9066 .rpc_message = &msg, 9067 .callback_ops = &nfs4_get_lease_time_ops, 9068 .callback_data = &data, 9069 .flags = RPC_TASK_TIMEOUT, 9070 }; 9071 9072 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9073 return nfs4_call_sync_custom(&task_setup); 9074 } 9075 9076 #ifdef CONFIG_NFS_V4_1 9077 9078 /* 9079 * Initialize the values to be used by the client in CREATE_SESSION 9080 * If nfs4_init_session set the fore channel request and response sizes, 9081 * use them. 9082 * 9083 * Set the back channel max_resp_sz_cached to zero to force the client to 9084 * always set csa_cachethis to FALSE because the current implementation 9085 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9086 */ 9087 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9088 struct rpc_clnt *clnt) 9089 { 9090 unsigned int max_rqst_sz, max_resp_sz; 9091 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9092 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9093 9094 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9095 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9096 9097 /* Fore channel attributes */ 9098 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9099 args->fc_attrs.max_resp_sz = max_resp_sz; 9100 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9101 args->fc_attrs.max_reqs = max_session_slots; 9102 9103 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9104 "max_ops=%u max_reqs=%u\n", 9105 __func__, 9106 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9107 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9108 9109 /* Back channel attributes */ 9110 args->bc_attrs.max_rqst_sz = max_bc_payload; 9111 args->bc_attrs.max_resp_sz = max_bc_payload; 9112 args->bc_attrs.max_resp_sz_cached = 0; 9113 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9114 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9115 if (args->bc_attrs.max_reqs > max_bc_slots) 9116 args->bc_attrs.max_reqs = max_bc_slots; 9117 9118 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9119 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9120 __func__, 9121 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9122 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9123 args->bc_attrs.max_reqs); 9124 } 9125 9126 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9127 struct nfs41_create_session_res *res) 9128 { 9129 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9130 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9131 9132 if (rcvd->max_resp_sz > sent->max_resp_sz) 9133 return -EINVAL; 9134 /* 9135 * Our requested max_ops is the minimum we need; we're not 9136 * prepared to break up compounds into smaller pieces than that. 9137 * So, no point even trying to continue if the server won't 9138 * cooperate: 9139 */ 9140 if (rcvd->max_ops < sent->max_ops) 9141 return -EINVAL; 9142 if (rcvd->max_reqs == 0) 9143 return -EINVAL; 9144 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9145 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9146 return 0; 9147 } 9148 9149 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9150 struct nfs41_create_session_res *res) 9151 { 9152 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9153 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9154 9155 if (!(res->flags & SESSION4_BACK_CHAN)) 9156 goto out; 9157 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9158 return -EINVAL; 9159 if (rcvd->max_resp_sz < sent->max_resp_sz) 9160 return -EINVAL; 9161 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9162 return -EINVAL; 9163 if (rcvd->max_ops > sent->max_ops) 9164 return -EINVAL; 9165 if (rcvd->max_reqs > sent->max_reqs) 9166 return -EINVAL; 9167 out: 9168 return 0; 9169 } 9170 9171 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9172 struct nfs41_create_session_res *res) 9173 { 9174 int ret; 9175 9176 ret = nfs4_verify_fore_channel_attrs(args, res); 9177 if (ret) 9178 return ret; 9179 return nfs4_verify_back_channel_attrs(args, res); 9180 } 9181 9182 static void nfs4_update_session(struct nfs4_session *session, 9183 struct nfs41_create_session_res *res) 9184 { 9185 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9186 /* Mark client id and session as being confirmed */ 9187 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9188 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9189 session->flags = res->flags; 9190 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9191 if (res->flags & SESSION4_BACK_CHAN) 9192 memcpy(&session->bc_attrs, &res->bc_attrs, 9193 sizeof(session->bc_attrs)); 9194 } 9195 9196 static int _nfs4_proc_create_session(struct nfs_client *clp, 9197 const struct cred *cred) 9198 { 9199 struct nfs4_session *session = clp->cl_session; 9200 struct nfs41_create_session_args args = { 9201 .client = clp, 9202 .clientid = clp->cl_clientid, 9203 .seqid = clp->cl_seqid, 9204 .cb_program = NFS4_CALLBACK, 9205 }; 9206 struct nfs41_create_session_res res; 9207 9208 struct rpc_message msg = { 9209 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9210 .rpc_argp = &args, 9211 .rpc_resp = &res, 9212 .rpc_cred = cred, 9213 }; 9214 int status; 9215 9216 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9217 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9218 9219 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9220 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9221 trace_nfs4_create_session(clp, status); 9222 9223 switch (status) { 9224 case -NFS4ERR_STALE_CLIENTID: 9225 case -NFS4ERR_DELAY: 9226 case -ETIMEDOUT: 9227 case -EACCES: 9228 case -EAGAIN: 9229 goto out; 9230 } 9231 9232 clp->cl_seqid++; 9233 if (!status) { 9234 /* Verify the session's negotiated channel_attrs values */ 9235 status = nfs4_verify_channel_attrs(&args, &res); 9236 /* Increment the clientid slot sequence id */ 9237 if (status) 9238 goto out; 9239 nfs4_update_session(session, &res); 9240 } 9241 out: 9242 return status; 9243 } 9244 9245 /* 9246 * Issues a CREATE_SESSION operation to the server. 9247 * It is the responsibility of the caller to verify the session is 9248 * expired before calling this routine. 9249 */ 9250 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9251 { 9252 int status; 9253 unsigned *ptr; 9254 struct nfs4_session *session = clp->cl_session; 9255 struct nfs4_add_xprt_data xprtdata = { 9256 .clp = clp, 9257 }; 9258 struct rpc_add_xprt_test rpcdata = { 9259 .add_xprt_test = clp->cl_mvops->session_trunk, 9260 .data = &xprtdata, 9261 }; 9262 9263 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9264 9265 status = _nfs4_proc_create_session(clp, cred); 9266 if (status) 9267 goto out; 9268 9269 /* Init or reset the session slot tables */ 9270 status = nfs4_setup_session_slot_tables(session); 9271 dprintk("slot table setup returned %d\n", status); 9272 if (status) 9273 goto out; 9274 9275 ptr = (unsigned *)&session->sess_id.data[0]; 9276 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9277 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9278 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9279 out: 9280 return status; 9281 } 9282 9283 /* 9284 * Issue the over-the-wire RPC DESTROY_SESSION. 9285 * The caller must serialize access to this routine. 9286 */ 9287 int nfs4_proc_destroy_session(struct nfs4_session *session, 9288 const struct cred *cred) 9289 { 9290 struct rpc_message msg = { 9291 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9292 .rpc_argp = session, 9293 .rpc_cred = cred, 9294 }; 9295 int status = 0; 9296 9297 /* session is still being setup */ 9298 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9299 return 0; 9300 9301 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9302 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9303 trace_nfs4_destroy_session(session->clp, status); 9304 9305 if (status) 9306 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9307 "Session has been destroyed regardless...\n", status); 9308 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9309 return status; 9310 } 9311 9312 /* 9313 * Renew the cl_session lease. 9314 */ 9315 struct nfs4_sequence_data { 9316 struct nfs_client *clp; 9317 struct nfs4_sequence_args args; 9318 struct nfs4_sequence_res res; 9319 }; 9320 9321 static void nfs41_sequence_release(void *data) 9322 { 9323 struct nfs4_sequence_data *calldata = data; 9324 struct nfs_client *clp = calldata->clp; 9325 9326 if (refcount_read(&clp->cl_count) > 1) 9327 nfs4_schedule_state_renewal(clp); 9328 nfs_put_client(clp); 9329 kfree(calldata); 9330 } 9331 9332 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9333 { 9334 switch(task->tk_status) { 9335 case -NFS4ERR_DELAY: 9336 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9337 return -EAGAIN; 9338 default: 9339 nfs4_schedule_lease_recovery(clp); 9340 } 9341 return 0; 9342 } 9343 9344 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9345 { 9346 struct nfs4_sequence_data *calldata = data; 9347 struct nfs_client *clp = calldata->clp; 9348 9349 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9350 return; 9351 9352 trace_nfs4_sequence(clp, task->tk_status); 9353 if (task->tk_status < 0) { 9354 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9355 if (refcount_read(&clp->cl_count) == 1) 9356 return; 9357 9358 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9359 rpc_restart_call_prepare(task); 9360 return; 9361 } 9362 } 9363 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9364 } 9365 9366 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9367 { 9368 struct nfs4_sequence_data *calldata = data; 9369 struct nfs_client *clp = calldata->clp; 9370 struct nfs4_sequence_args *args; 9371 struct nfs4_sequence_res *res; 9372 9373 args = task->tk_msg.rpc_argp; 9374 res = task->tk_msg.rpc_resp; 9375 9376 nfs4_setup_sequence(clp, args, res, task); 9377 } 9378 9379 static const struct rpc_call_ops nfs41_sequence_ops = { 9380 .rpc_call_done = nfs41_sequence_call_done, 9381 .rpc_call_prepare = nfs41_sequence_prepare, 9382 .rpc_release = nfs41_sequence_release, 9383 }; 9384 9385 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9386 const struct cred *cred, 9387 struct nfs4_slot *slot, 9388 bool is_privileged) 9389 { 9390 struct nfs4_sequence_data *calldata; 9391 struct rpc_message msg = { 9392 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9393 .rpc_cred = cred, 9394 }; 9395 struct rpc_task_setup task_setup_data = { 9396 .rpc_client = clp->cl_rpcclient, 9397 .rpc_message = &msg, 9398 .callback_ops = &nfs41_sequence_ops, 9399 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9400 }; 9401 struct rpc_task *ret; 9402 9403 ret = ERR_PTR(-EIO); 9404 if (!refcount_inc_not_zero(&clp->cl_count)) 9405 goto out_err; 9406 9407 ret = ERR_PTR(-ENOMEM); 9408 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9409 if (calldata == NULL) 9410 goto out_put_clp; 9411 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9412 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9413 msg.rpc_argp = &calldata->args; 9414 msg.rpc_resp = &calldata->res; 9415 calldata->clp = clp; 9416 task_setup_data.callback_data = calldata; 9417 9418 ret = rpc_run_task(&task_setup_data); 9419 if (IS_ERR(ret)) 9420 goto out_err; 9421 return ret; 9422 out_put_clp: 9423 nfs_put_client(clp); 9424 out_err: 9425 nfs41_release_slot(slot); 9426 return ret; 9427 } 9428 9429 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9430 { 9431 struct rpc_task *task; 9432 int ret = 0; 9433 9434 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9435 return -EAGAIN; 9436 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9437 if (IS_ERR(task)) 9438 ret = PTR_ERR(task); 9439 else 9440 rpc_put_task_async(task); 9441 dprintk("<-- %s status=%d\n", __func__, ret); 9442 return ret; 9443 } 9444 9445 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9446 { 9447 struct rpc_task *task; 9448 int ret; 9449 9450 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9451 if (IS_ERR(task)) { 9452 ret = PTR_ERR(task); 9453 goto out; 9454 } 9455 ret = rpc_wait_for_completion_task(task); 9456 if (!ret) 9457 ret = task->tk_status; 9458 rpc_put_task(task); 9459 out: 9460 dprintk("<-- %s status=%d\n", __func__, ret); 9461 return ret; 9462 } 9463 9464 struct nfs4_reclaim_complete_data { 9465 struct nfs_client *clp; 9466 struct nfs41_reclaim_complete_args arg; 9467 struct nfs41_reclaim_complete_res res; 9468 }; 9469 9470 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9471 { 9472 struct nfs4_reclaim_complete_data *calldata = data; 9473 9474 nfs4_setup_sequence(calldata->clp, 9475 &calldata->arg.seq_args, 9476 &calldata->res.seq_res, 9477 task); 9478 } 9479 9480 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9481 { 9482 switch(task->tk_status) { 9483 case 0: 9484 wake_up_all(&clp->cl_lock_waitq); 9485 fallthrough; 9486 case -NFS4ERR_COMPLETE_ALREADY: 9487 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9488 break; 9489 case -NFS4ERR_DELAY: 9490 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9491 fallthrough; 9492 case -NFS4ERR_RETRY_UNCACHED_REP: 9493 case -EACCES: 9494 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9495 __func__, task->tk_status, clp->cl_hostname); 9496 return -EAGAIN; 9497 case -NFS4ERR_BADSESSION: 9498 case -NFS4ERR_DEADSESSION: 9499 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9500 break; 9501 default: 9502 nfs4_schedule_lease_recovery(clp); 9503 } 9504 return 0; 9505 } 9506 9507 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9508 { 9509 struct nfs4_reclaim_complete_data *calldata = data; 9510 struct nfs_client *clp = calldata->clp; 9511 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9512 9513 if (!nfs41_sequence_done(task, res)) 9514 return; 9515 9516 trace_nfs4_reclaim_complete(clp, task->tk_status); 9517 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9518 rpc_restart_call_prepare(task); 9519 return; 9520 } 9521 } 9522 9523 static void nfs4_free_reclaim_complete_data(void *data) 9524 { 9525 struct nfs4_reclaim_complete_data *calldata = data; 9526 9527 kfree(calldata); 9528 } 9529 9530 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9531 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9532 .rpc_call_done = nfs4_reclaim_complete_done, 9533 .rpc_release = nfs4_free_reclaim_complete_data, 9534 }; 9535 9536 /* 9537 * Issue a global reclaim complete. 9538 */ 9539 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9540 const struct cred *cred) 9541 { 9542 struct nfs4_reclaim_complete_data *calldata; 9543 struct rpc_message msg = { 9544 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9545 .rpc_cred = cred, 9546 }; 9547 struct rpc_task_setup task_setup_data = { 9548 .rpc_client = clp->cl_rpcclient, 9549 .rpc_message = &msg, 9550 .callback_ops = &nfs4_reclaim_complete_call_ops, 9551 .flags = RPC_TASK_NO_ROUND_ROBIN, 9552 }; 9553 int status = -ENOMEM; 9554 9555 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9556 if (calldata == NULL) 9557 goto out; 9558 calldata->clp = clp; 9559 calldata->arg.one_fs = 0; 9560 9561 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9562 msg.rpc_argp = &calldata->arg; 9563 msg.rpc_resp = &calldata->res; 9564 task_setup_data.callback_data = calldata; 9565 status = nfs4_call_sync_custom(&task_setup_data); 9566 out: 9567 dprintk("<-- %s status=%d\n", __func__, status); 9568 return status; 9569 } 9570 9571 static void 9572 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9573 { 9574 struct nfs4_layoutget *lgp = calldata; 9575 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9576 9577 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9578 &lgp->res.seq_res, task); 9579 } 9580 9581 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9582 { 9583 struct nfs4_layoutget *lgp = calldata; 9584 9585 nfs41_sequence_process(task, &lgp->res.seq_res); 9586 } 9587 9588 static int 9589 nfs4_layoutget_handle_exception(struct rpc_task *task, 9590 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9591 { 9592 struct inode *inode = lgp->args.inode; 9593 struct nfs_server *server = NFS_SERVER(inode); 9594 struct pnfs_layout_hdr *lo = lgp->lo; 9595 int nfs4err = task->tk_status; 9596 int err, status = 0; 9597 LIST_HEAD(head); 9598 9599 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9600 9601 nfs4_sequence_free_slot(&lgp->res.seq_res); 9602 9603 switch (nfs4err) { 9604 case 0: 9605 goto out; 9606 9607 /* 9608 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9609 * on the file. set tk_status to -ENODATA to tell upper layer to 9610 * retry go inband. 9611 */ 9612 case -NFS4ERR_LAYOUTUNAVAILABLE: 9613 status = -ENODATA; 9614 goto out; 9615 /* 9616 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9617 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9618 */ 9619 case -NFS4ERR_BADLAYOUT: 9620 status = -EOVERFLOW; 9621 goto out; 9622 /* 9623 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9624 * (or clients) writing to the same RAID stripe except when 9625 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9626 * 9627 * Treat it like we would RECALLCONFLICT -- we retry for a little 9628 * while, and then eventually give up. 9629 */ 9630 case -NFS4ERR_LAYOUTTRYLATER: 9631 if (lgp->args.minlength == 0) { 9632 status = -EOVERFLOW; 9633 goto out; 9634 } 9635 status = -EBUSY; 9636 break; 9637 case -NFS4ERR_RECALLCONFLICT: 9638 status = -ERECALLCONFLICT; 9639 break; 9640 case -NFS4ERR_DELEG_REVOKED: 9641 case -NFS4ERR_ADMIN_REVOKED: 9642 case -NFS4ERR_EXPIRED: 9643 case -NFS4ERR_BAD_STATEID: 9644 exception->timeout = 0; 9645 spin_lock(&inode->i_lock); 9646 /* If the open stateid was bad, then recover it. */ 9647 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9648 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9649 spin_unlock(&inode->i_lock); 9650 exception->state = lgp->args.ctx->state; 9651 exception->stateid = &lgp->args.stateid; 9652 break; 9653 } 9654 9655 /* 9656 * Mark the bad layout state as invalid, then retry 9657 */ 9658 pnfs_mark_layout_stateid_invalid(lo, &head); 9659 spin_unlock(&inode->i_lock); 9660 nfs_commit_inode(inode, 0); 9661 pnfs_free_lseg_list(&head); 9662 status = -EAGAIN; 9663 goto out; 9664 } 9665 9666 err = nfs4_handle_exception(server, nfs4err, exception); 9667 if (!status) { 9668 if (exception->retry) 9669 status = -EAGAIN; 9670 else 9671 status = err; 9672 } 9673 out: 9674 return status; 9675 } 9676 9677 size_t max_response_pages(struct nfs_server *server) 9678 { 9679 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9680 return nfs_page_array_len(0, max_resp_sz); 9681 } 9682 9683 static void nfs4_layoutget_release(void *calldata) 9684 { 9685 struct nfs4_layoutget *lgp = calldata; 9686 9687 nfs4_sequence_free_slot(&lgp->res.seq_res); 9688 pnfs_layoutget_free(lgp); 9689 } 9690 9691 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9692 .rpc_call_prepare = nfs4_layoutget_prepare, 9693 .rpc_call_done = nfs4_layoutget_done, 9694 .rpc_release = nfs4_layoutget_release, 9695 }; 9696 9697 struct pnfs_layout_segment * 9698 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9699 { 9700 struct inode *inode = lgp->args.inode; 9701 struct nfs_server *server = NFS_SERVER(inode); 9702 struct rpc_task *task; 9703 struct rpc_message msg = { 9704 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9705 .rpc_argp = &lgp->args, 9706 .rpc_resp = &lgp->res, 9707 .rpc_cred = lgp->cred, 9708 }; 9709 struct rpc_task_setup task_setup_data = { 9710 .rpc_client = server->client, 9711 .rpc_message = &msg, 9712 .callback_ops = &nfs4_layoutget_call_ops, 9713 .callback_data = lgp, 9714 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9715 RPC_TASK_MOVEABLE, 9716 }; 9717 struct pnfs_layout_segment *lseg = NULL; 9718 struct nfs4_exception exception = { 9719 .inode = inode, 9720 .timeout = *timeout, 9721 }; 9722 int status = 0; 9723 9724 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9725 9726 task = rpc_run_task(&task_setup_data); 9727 if (IS_ERR(task)) 9728 return ERR_CAST(task); 9729 9730 status = rpc_wait_for_completion_task(task); 9731 if (status != 0) 9732 goto out; 9733 9734 if (task->tk_status < 0) { 9735 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9736 *timeout = exception.timeout; 9737 } else if (lgp->res.layoutp->len == 0) { 9738 status = -EAGAIN; 9739 *timeout = nfs4_update_delay(&exception.timeout); 9740 } else 9741 lseg = pnfs_layout_process(lgp); 9742 out: 9743 trace_nfs4_layoutget(lgp->args.ctx, 9744 &lgp->args.range, 9745 &lgp->res.range, 9746 &lgp->res.stateid, 9747 status); 9748 9749 rpc_put_task(task); 9750 dprintk("<-- %s status=%d\n", __func__, status); 9751 if (status) 9752 return ERR_PTR(status); 9753 return lseg; 9754 } 9755 9756 static void 9757 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9758 { 9759 struct nfs4_layoutreturn *lrp = calldata; 9760 9761 nfs4_setup_sequence(lrp->clp, 9762 &lrp->args.seq_args, 9763 &lrp->res.seq_res, 9764 task); 9765 if (!pnfs_layout_is_valid(lrp->args.layout)) 9766 rpc_exit(task, 0); 9767 } 9768 9769 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9770 { 9771 struct nfs4_layoutreturn *lrp = calldata; 9772 struct nfs_server *server; 9773 9774 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9775 return; 9776 9777 /* 9778 * Was there an RPC level error? Assume the call succeeded, 9779 * and that we need to release the layout 9780 */ 9781 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9782 lrp->res.lrs_present = 0; 9783 return; 9784 } 9785 9786 server = NFS_SERVER(lrp->args.inode); 9787 switch (task->tk_status) { 9788 case -NFS4ERR_OLD_STATEID: 9789 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9790 &lrp->args.range, 9791 lrp->args.inode)) 9792 goto out_restart; 9793 fallthrough; 9794 default: 9795 task->tk_status = 0; 9796 fallthrough; 9797 case 0: 9798 break; 9799 case -NFS4ERR_DELAY: 9800 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9801 break; 9802 goto out_restart; 9803 } 9804 return; 9805 out_restart: 9806 task->tk_status = 0; 9807 nfs4_sequence_free_slot(&lrp->res.seq_res); 9808 rpc_restart_call_prepare(task); 9809 } 9810 9811 static void nfs4_layoutreturn_release(void *calldata) 9812 { 9813 struct nfs4_layoutreturn *lrp = calldata; 9814 struct pnfs_layout_hdr *lo = lrp->args.layout; 9815 9816 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9817 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9818 nfs4_sequence_free_slot(&lrp->res.seq_res); 9819 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9820 lrp->ld_private.ops->free(&lrp->ld_private); 9821 pnfs_put_layout_hdr(lrp->args.layout); 9822 nfs_iput_and_deactive(lrp->inode); 9823 put_cred(lrp->cred); 9824 kfree(calldata); 9825 } 9826 9827 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9828 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9829 .rpc_call_done = nfs4_layoutreturn_done, 9830 .rpc_release = nfs4_layoutreturn_release, 9831 }; 9832 9833 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9834 { 9835 struct rpc_task *task; 9836 struct rpc_message msg = { 9837 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9838 .rpc_argp = &lrp->args, 9839 .rpc_resp = &lrp->res, 9840 .rpc_cred = lrp->cred, 9841 }; 9842 struct rpc_task_setup task_setup_data = { 9843 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9844 .rpc_message = &msg, 9845 .callback_ops = &nfs4_layoutreturn_call_ops, 9846 .callback_data = lrp, 9847 .flags = RPC_TASK_MOVEABLE, 9848 }; 9849 int status = 0; 9850 9851 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9852 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9853 &task_setup_data.rpc_client, &msg); 9854 9855 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9856 if (!sync) { 9857 if (!lrp->inode) { 9858 nfs4_layoutreturn_release(lrp); 9859 return -EAGAIN; 9860 } 9861 task_setup_data.flags |= RPC_TASK_ASYNC; 9862 } 9863 if (!lrp->inode) 9864 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9865 1); 9866 else 9867 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9868 0); 9869 task = rpc_run_task(&task_setup_data); 9870 if (IS_ERR(task)) 9871 return PTR_ERR(task); 9872 if (sync) 9873 status = task->tk_status; 9874 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9875 dprintk("<-- %s status=%d\n", __func__, status); 9876 rpc_put_task(task); 9877 return status; 9878 } 9879 9880 static int 9881 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9882 struct pnfs_device *pdev, 9883 const struct cred *cred) 9884 { 9885 struct nfs4_getdeviceinfo_args args = { 9886 .pdev = pdev, 9887 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9888 NOTIFY_DEVICEID4_DELETE, 9889 }; 9890 struct nfs4_getdeviceinfo_res res = { 9891 .pdev = pdev, 9892 }; 9893 struct rpc_message msg = { 9894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9895 .rpc_argp = &args, 9896 .rpc_resp = &res, 9897 .rpc_cred = cred, 9898 }; 9899 int status; 9900 9901 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9902 if (res.notification & ~args.notify_types) 9903 dprintk("%s: unsupported notification\n", __func__); 9904 if (res.notification != args.notify_types) 9905 pdev->nocache = 1; 9906 9907 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9908 9909 dprintk("<-- %s status=%d\n", __func__, status); 9910 9911 return status; 9912 } 9913 9914 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9915 struct pnfs_device *pdev, 9916 const struct cred *cred) 9917 { 9918 struct nfs4_exception exception = { }; 9919 int err; 9920 9921 do { 9922 err = nfs4_handle_exception(server, 9923 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9924 &exception); 9925 } while (exception.retry); 9926 return err; 9927 } 9928 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9929 9930 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9931 { 9932 struct nfs4_layoutcommit_data *data = calldata; 9933 struct nfs_server *server = NFS_SERVER(data->args.inode); 9934 9935 nfs4_setup_sequence(server->nfs_client, 9936 &data->args.seq_args, 9937 &data->res.seq_res, 9938 task); 9939 } 9940 9941 static void 9942 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9943 { 9944 struct nfs4_layoutcommit_data *data = calldata; 9945 struct nfs_server *server = NFS_SERVER(data->args.inode); 9946 9947 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9948 return; 9949 9950 switch (task->tk_status) { /* Just ignore these failures */ 9951 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9952 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9953 case -NFS4ERR_BADLAYOUT: /* no layout */ 9954 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9955 task->tk_status = 0; 9956 break; 9957 case 0: 9958 break; 9959 default: 9960 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9961 rpc_restart_call_prepare(task); 9962 return; 9963 } 9964 } 9965 } 9966 9967 static void nfs4_layoutcommit_release(void *calldata) 9968 { 9969 struct nfs4_layoutcommit_data *data = calldata; 9970 9971 pnfs_cleanup_layoutcommit(data); 9972 nfs_post_op_update_inode_force_wcc(data->args.inode, 9973 data->res.fattr); 9974 put_cred(data->cred); 9975 nfs_iput_and_deactive(data->inode); 9976 kfree(data); 9977 } 9978 9979 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9980 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9981 .rpc_call_done = nfs4_layoutcommit_done, 9982 .rpc_release = nfs4_layoutcommit_release, 9983 }; 9984 9985 int 9986 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9987 { 9988 struct rpc_message msg = { 9989 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9990 .rpc_argp = &data->args, 9991 .rpc_resp = &data->res, 9992 .rpc_cred = data->cred, 9993 }; 9994 struct rpc_task_setup task_setup_data = { 9995 .task = &data->task, 9996 .rpc_client = NFS_CLIENT(data->args.inode), 9997 .rpc_message = &msg, 9998 .callback_ops = &nfs4_layoutcommit_ops, 9999 .callback_data = data, 10000 .flags = RPC_TASK_MOVEABLE, 10001 }; 10002 struct rpc_task *task; 10003 int status = 0; 10004 10005 dprintk("NFS: initiating layoutcommit call. sync %d " 10006 "lbw: %llu inode %lu\n", sync, 10007 data->args.lastbytewritten, 10008 data->args.inode->i_ino); 10009 10010 if (!sync) { 10011 data->inode = nfs_igrab_and_active(data->args.inode); 10012 if (data->inode == NULL) { 10013 nfs4_layoutcommit_release(data); 10014 return -EAGAIN; 10015 } 10016 task_setup_data.flags = RPC_TASK_ASYNC; 10017 } 10018 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10019 task = rpc_run_task(&task_setup_data); 10020 if (IS_ERR(task)) 10021 return PTR_ERR(task); 10022 if (sync) 10023 status = task->tk_status; 10024 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10025 dprintk("%s: status %d\n", __func__, status); 10026 rpc_put_task(task); 10027 return status; 10028 } 10029 10030 /* 10031 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10032 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10033 */ 10034 static int 10035 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10036 struct nfs_fsinfo *info, 10037 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10038 { 10039 struct nfs41_secinfo_no_name_args args = { 10040 .style = SECINFO_STYLE_CURRENT_FH, 10041 }; 10042 struct nfs4_secinfo_res res = { 10043 .flavors = flavors, 10044 }; 10045 struct rpc_message msg = { 10046 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10047 .rpc_argp = &args, 10048 .rpc_resp = &res, 10049 }; 10050 struct nfs4_call_sync_data data = { 10051 .seq_server = server, 10052 .seq_args = &args.seq_args, 10053 .seq_res = &res.seq_res, 10054 }; 10055 struct rpc_task_setup task_setup = { 10056 .rpc_client = server->client, 10057 .rpc_message = &msg, 10058 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10059 .callback_data = &data, 10060 .flags = RPC_TASK_NO_ROUND_ROBIN, 10061 }; 10062 const struct cred *cred = NULL; 10063 int status; 10064 10065 if (use_integrity) { 10066 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10067 10068 cred = nfs4_get_clid_cred(server->nfs_client); 10069 msg.rpc_cred = cred; 10070 } 10071 10072 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10073 status = nfs4_call_sync_custom(&task_setup); 10074 dprintk("<-- %s status=%d\n", __func__, status); 10075 10076 put_cred(cred); 10077 10078 return status; 10079 } 10080 10081 static int 10082 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10083 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10084 { 10085 struct nfs4_exception exception = { 10086 .interruptible = true, 10087 }; 10088 int err; 10089 do { 10090 /* first try using integrity protection */ 10091 err = -NFS4ERR_WRONGSEC; 10092 10093 /* try to use integrity protection with machine cred */ 10094 if (_nfs4_is_integrity_protected(server->nfs_client)) 10095 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10096 flavors, true); 10097 10098 /* 10099 * if unable to use integrity protection, or SECINFO with 10100 * integrity protection returns NFS4ERR_WRONGSEC (which is 10101 * disallowed by spec, but exists in deployed servers) use 10102 * the current filesystem's rpc_client and the user cred. 10103 */ 10104 if (err == -NFS4ERR_WRONGSEC) 10105 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10106 flavors, false); 10107 10108 switch (err) { 10109 case 0: 10110 case -NFS4ERR_WRONGSEC: 10111 case -ENOTSUPP: 10112 goto out; 10113 default: 10114 err = nfs4_handle_exception(server, err, &exception); 10115 } 10116 } while (exception.retry); 10117 out: 10118 return err; 10119 } 10120 10121 static int 10122 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10123 struct nfs_fsinfo *info) 10124 { 10125 int err; 10126 struct page *page; 10127 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10128 struct nfs4_secinfo_flavors *flavors; 10129 struct nfs4_secinfo4 *secinfo; 10130 int i; 10131 10132 page = alloc_page(GFP_KERNEL); 10133 if (!page) { 10134 err = -ENOMEM; 10135 goto out; 10136 } 10137 10138 flavors = page_address(page); 10139 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10140 10141 /* 10142 * Fall back on "guess and check" method if 10143 * the server doesn't support SECINFO_NO_NAME 10144 */ 10145 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10146 err = nfs4_find_root_sec(server, fhandle, info); 10147 goto out_freepage; 10148 } 10149 if (err) 10150 goto out_freepage; 10151 10152 for (i = 0; i < flavors->num_flavors; i++) { 10153 secinfo = &flavors->flavors[i]; 10154 10155 switch (secinfo->flavor) { 10156 case RPC_AUTH_NULL: 10157 case RPC_AUTH_UNIX: 10158 case RPC_AUTH_GSS: 10159 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10160 &secinfo->flavor_info); 10161 break; 10162 default: 10163 flavor = RPC_AUTH_MAXFLAVOR; 10164 break; 10165 } 10166 10167 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10168 flavor = RPC_AUTH_MAXFLAVOR; 10169 10170 if (flavor != RPC_AUTH_MAXFLAVOR) { 10171 err = nfs4_lookup_root_sec(server, fhandle, 10172 info, flavor); 10173 if (!err) 10174 break; 10175 } 10176 } 10177 10178 if (flavor == RPC_AUTH_MAXFLAVOR) 10179 err = -EPERM; 10180 10181 out_freepage: 10182 put_page(page); 10183 if (err == -EACCES) 10184 return -EPERM; 10185 out: 10186 return err; 10187 } 10188 10189 static int _nfs41_test_stateid(struct nfs_server *server, 10190 nfs4_stateid *stateid, 10191 const struct cred *cred) 10192 { 10193 int status; 10194 struct nfs41_test_stateid_args args = { 10195 .stateid = stateid, 10196 }; 10197 struct nfs41_test_stateid_res res; 10198 struct rpc_message msg = { 10199 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10200 .rpc_argp = &args, 10201 .rpc_resp = &res, 10202 .rpc_cred = cred, 10203 }; 10204 struct rpc_clnt *rpc_client = server->client; 10205 10206 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10207 &rpc_client, &msg); 10208 10209 dprintk("NFS call test_stateid %p\n", stateid); 10210 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10211 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10212 &args.seq_args, &res.seq_res); 10213 if (status != NFS_OK) { 10214 dprintk("NFS reply test_stateid: failed, %d\n", status); 10215 return status; 10216 } 10217 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10218 return -res.status; 10219 } 10220 10221 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10222 int err, struct nfs4_exception *exception) 10223 { 10224 exception->retry = 0; 10225 switch(err) { 10226 case -NFS4ERR_DELAY: 10227 case -NFS4ERR_RETRY_UNCACHED_REP: 10228 nfs4_handle_exception(server, err, exception); 10229 break; 10230 case -NFS4ERR_BADSESSION: 10231 case -NFS4ERR_BADSLOT: 10232 case -NFS4ERR_BAD_HIGH_SLOT: 10233 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10234 case -NFS4ERR_DEADSESSION: 10235 nfs4_do_handle_exception(server, err, exception); 10236 } 10237 } 10238 10239 /** 10240 * nfs41_test_stateid - perform a TEST_STATEID operation 10241 * 10242 * @server: server / transport on which to perform the operation 10243 * @stateid: state ID to test 10244 * @cred: credential 10245 * 10246 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10247 * Otherwise a negative NFS4ERR value is returned if the operation 10248 * failed or the state ID is not currently valid. 10249 */ 10250 static int nfs41_test_stateid(struct nfs_server *server, 10251 nfs4_stateid *stateid, 10252 const struct cred *cred) 10253 { 10254 struct nfs4_exception exception = { 10255 .interruptible = true, 10256 }; 10257 int err; 10258 do { 10259 err = _nfs41_test_stateid(server, stateid, cred); 10260 nfs4_handle_delay_or_session_error(server, err, &exception); 10261 } while (exception.retry); 10262 return err; 10263 } 10264 10265 struct nfs_free_stateid_data { 10266 struct nfs_server *server; 10267 struct nfs41_free_stateid_args args; 10268 struct nfs41_free_stateid_res res; 10269 }; 10270 10271 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10272 { 10273 struct nfs_free_stateid_data *data = calldata; 10274 nfs4_setup_sequence(data->server->nfs_client, 10275 &data->args.seq_args, 10276 &data->res.seq_res, 10277 task); 10278 } 10279 10280 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10281 { 10282 struct nfs_free_stateid_data *data = calldata; 10283 10284 nfs41_sequence_done(task, &data->res.seq_res); 10285 10286 switch (task->tk_status) { 10287 case -NFS4ERR_DELAY: 10288 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10289 rpc_restart_call_prepare(task); 10290 } 10291 } 10292 10293 static void nfs41_free_stateid_release(void *calldata) 10294 { 10295 struct nfs_free_stateid_data *data = calldata; 10296 struct nfs_client *clp = data->server->nfs_client; 10297 10298 nfs_put_client(clp); 10299 kfree(calldata); 10300 } 10301 10302 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10303 .rpc_call_prepare = nfs41_free_stateid_prepare, 10304 .rpc_call_done = nfs41_free_stateid_done, 10305 .rpc_release = nfs41_free_stateid_release, 10306 }; 10307 10308 /** 10309 * nfs41_free_stateid - perform a FREE_STATEID operation 10310 * 10311 * @server: server / transport on which to perform the operation 10312 * @stateid: state ID to release 10313 * @cred: credential 10314 * @privileged: set to true if this call needs to be privileged 10315 * 10316 * Note: this function is always asynchronous. 10317 */ 10318 static int nfs41_free_stateid(struct nfs_server *server, 10319 const nfs4_stateid *stateid, 10320 const struct cred *cred, 10321 bool privileged) 10322 { 10323 struct rpc_message msg = { 10324 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10325 .rpc_cred = cred, 10326 }; 10327 struct rpc_task_setup task_setup = { 10328 .rpc_client = server->client, 10329 .rpc_message = &msg, 10330 .callback_ops = &nfs41_free_stateid_ops, 10331 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10332 }; 10333 struct nfs_free_stateid_data *data; 10334 struct rpc_task *task; 10335 struct nfs_client *clp = server->nfs_client; 10336 10337 if (!refcount_inc_not_zero(&clp->cl_count)) 10338 return -EIO; 10339 10340 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10341 &task_setup.rpc_client, &msg); 10342 10343 dprintk("NFS call free_stateid %p\n", stateid); 10344 data = kmalloc(sizeof(*data), GFP_KERNEL); 10345 if (!data) 10346 return -ENOMEM; 10347 data->server = server; 10348 nfs4_stateid_copy(&data->args.stateid, stateid); 10349 10350 task_setup.callback_data = data; 10351 10352 msg.rpc_argp = &data->args; 10353 msg.rpc_resp = &data->res; 10354 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10355 task = rpc_run_task(&task_setup); 10356 if (IS_ERR(task)) 10357 return PTR_ERR(task); 10358 rpc_put_task(task); 10359 return 0; 10360 } 10361 10362 static void 10363 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10364 { 10365 const struct cred *cred = lsp->ls_state->owner->so_cred; 10366 10367 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10368 nfs4_free_lock_state(server, lsp); 10369 } 10370 10371 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10372 const nfs4_stateid *s2) 10373 { 10374 if (s1->type != s2->type) 10375 return false; 10376 10377 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10378 return false; 10379 10380 if (s1->seqid == s2->seqid) 10381 return true; 10382 10383 return s1->seqid == 0 || s2->seqid == 0; 10384 } 10385 10386 #endif /* CONFIG_NFS_V4_1 */ 10387 10388 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10389 const nfs4_stateid *s2) 10390 { 10391 return nfs4_stateid_match(s1, s2); 10392 } 10393 10394 10395 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10396 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10397 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10398 .recover_open = nfs4_open_reclaim, 10399 .recover_lock = nfs4_lock_reclaim, 10400 .establish_clid = nfs4_init_clientid, 10401 .detect_trunking = nfs40_discover_server_trunking, 10402 }; 10403 10404 #if defined(CONFIG_NFS_V4_1) 10405 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10406 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10407 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10408 .recover_open = nfs4_open_reclaim, 10409 .recover_lock = nfs4_lock_reclaim, 10410 .establish_clid = nfs41_init_clientid, 10411 .reclaim_complete = nfs41_proc_reclaim_complete, 10412 .detect_trunking = nfs41_discover_server_trunking, 10413 }; 10414 #endif /* CONFIG_NFS_V4_1 */ 10415 10416 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10417 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10418 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10419 .recover_open = nfs40_open_expired, 10420 .recover_lock = nfs4_lock_expired, 10421 .establish_clid = nfs4_init_clientid, 10422 }; 10423 10424 #if defined(CONFIG_NFS_V4_1) 10425 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10426 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10427 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10428 .recover_open = nfs41_open_expired, 10429 .recover_lock = nfs41_lock_expired, 10430 .establish_clid = nfs41_init_clientid, 10431 }; 10432 #endif /* CONFIG_NFS_V4_1 */ 10433 10434 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10435 .sched_state_renewal = nfs4_proc_async_renew, 10436 .get_state_renewal_cred = nfs4_get_renew_cred, 10437 .renew_lease = nfs4_proc_renew, 10438 }; 10439 10440 #if defined(CONFIG_NFS_V4_1) 10441 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10442 .sched_state_renewal = nfs41_proc_async_sequence, 10443 .get_state_renewal_cred = nfs4_get_machine_cred, 10444 .renew_lease = nfs4_proc_sequence, 10445 }; 10446 #endif 10447 10448 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10449 .get_locations = _nfs40_proc_get_locations, 10450 .fsid_present = _nfs40_proc_fsid_present, 10451 }; 10452 10453 #if defined(CONFIG_NFS_V4_1) 10454 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10455 .get_locations = _nfs41_proc_get_locations, 10456 .fsid_present = _nfs41_proc_fsid_present, 10457 }; 10458 #endif /* CONFIG_NFS_V4_1 */ 10459 10460 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10461 .minor_version = 0, 10462 .init_caps = NFS_CAP_READDIRPLUS 10463 | NFS_CAP_ATOMIC_OPEN 10464 | NFS_CAP_POSIX_LOCK, 10465 .init_client = nfs40_init_client, 10466 .shutdown_client = nfs40_shutdown_client, 10467 .match_stateid = nfs4_match_stateid, 10468 .find_root_sec = nfs4_find_root_sec, 10469 .free_lock_state = nfs4_release_lockowner, 10470 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10471 .alloc_seqid = nfs_alloc_seqid, 10472 .call_sync_ops = &nfs40_call_sync_ops, 10473 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10474 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10475 .state_renewal_ops = &nfs40_state_renewal_ops, 10476 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10477 }; 10478 10479 #if defined(CONFIG_NFS_V4_1) 10480 static struct nfs_seqid * 10481 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10482 { 10483 return NULL; 10484 } 10485 10486 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10487 .minor_version = 1, 10488 .init_caps = NFS_CAP_READDIRPLUS 10489 | NFS_CAP_ATOMIC_OPEN 10490 | NFS_CAP_POSIX_LOCK 10491 | NFS_CAP_STATEID_NFSV41 10492 | NFS_CAP_ATOMIC_OPEN_V1 10493 | NFS_CAP_LGOPEN 10494 | NFS_CAP_MOVEABLE, 10495 .init_client = nfs41_init_client, 10496 .shutdown_client = nfs41_shutdown_client, 10497 .match_stateid = nfs41_match_stateid, 10498 .find_root_sec = nfs41_find_root_sec, 10499 .free_lock_state = nfs41_free_lock_state, 10500 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10501 .alloc_seqid = nfs_alloc_no_seqid, 10502 .session_trunk = nfs4_test_session_trunk, 10503 .call_sync_ops = &nfs41_call_sync_ops, 10504 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10505 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10506 .state_renewal_ops = &nfs41_state_renewal_ops, 10507 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10508 }; 10509 #endif 10510 10511 #if defined(CONFIG_NFS_V4_2) 10512 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10513 .minor_version = 2, 10514 .init_caps = NFS_CAP_READDIRPLUS 10515 | NFS_CAP_ATOMIC_OPEN 10516 | NFS_CAP_POSIX_LOCK 10517 | NFS_CAP_STATEID_NFSV41 10518 | NFS_CAP_ATOMIC_OPEN_V1 10519 | NFS_CAP_LGOPEN 10520 | NFS_CAP_ALLOCATE 10521 | NFS_CAP_COPY 10522 | NFS_CAP_OFFLOAD_CANCEL 10523 | NFS_CAP_COPY_NOTIFY 10524 | NFS_CAP_DEALLOCATE 10525 | NFS_CAP_SEEK 10526 | NFS_CAP_LAYOUTSTATS 10527 | NFS_CAP_CLONE 10528 | NFS_CAP_LAYOUTERROR 10529 | NFS_CAP_READ_PLUS 10530 | NFS_CAP_MOVEABLE, 10531 .init_client = nfs41_init_client, 10532 .shutdown_client = nfs41_shutdown_client, 10533 .match_stateid = nfs41_match_stateid, 10534 .find_root_sec = nfs41_find_root_sec, 10535 .free_lock_state = nfs41_free_lock_state, 10536 .call_sync_ops = &nfs41_call_sync_ops, 10537 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10538 .alloc_seqid = nfs_alloc_no_seqid, 10539 .session_trunk = nfs4_test_session_trunk, 10540 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10541 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10542 .state_renewal_ops = &nfs41_state_renewal_ops, 10543 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10544 }; 10545 #endif 10546 10547 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10548 [0] = &nfs_v4_0_minor_ops, 10549 #if defined(CONFIG_NFS_V4_1) 10550 [1] = &nfs_v4_1_minor_ops, 10551 #endif 10552 #if defined(CONFIG_NFS_V4_2) 10553 [2] = &nfs_v4_2_minor_ops, 10554 #endif 10555 }; 10556 10557 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10558 { 10559 ssize_t error, error2, error3; 10560 10561 error = generic_listxattr(dentry, list, size); 10562 if (error < 0) 10563 return error; 10564 if (list) { 10565 list += error; 10566 size -= error; 10567 } 10568 10569 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10570 if (error2 < 0) 10571 return error2; 10572 10573 if (list) { 10574 list += error2; 10575 size -= error2; 10576 } 10577 10578 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10579 if (error3 < 0) 10580 return error3; 10581 10582 return error + error2 + error3; 10583 } 10584 10585 static void nfs4_enable_swap(struct inode *inode) 10586 { 10587 /* The state manager thread must always be running. 10588 * It will notice the client is a swapper, and stay put. 10589 */ 10590 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10591 10592 nfs4_schedule_state_manager(clp); 10593 } 10594 10595 static void nfs4_disable_swap(struct inode *inode) 10596 { 10597 /* The state manager thread will now exit once it is 10598 * woken. 10599 */ 10600 wake_up_var(&NFS_SERVER(inode)->nfs_client->cl_state); 10601 } 10602 10603 static const struct inode_operations nfs4_dir_inode_operations = { 10604 .create = nfs_create, 10605 .lookup = nfs_lookup, 10606 .atomic_open = nfs_atomic_open, 10607 .link = nfs_link, 10608 .unlink = nfs_unlink, 10609 .symlink = nfs_symlink, 10610 .mkdir = nfs_mkdir, 10611 .rmdir = nfs_rmdir, 10612 .mknod = nfs_mknod, 10613 .rename = nfs_rename, 10614 .permission = nfs_permission, 10615 .getattr = nfs_getattr, 10616 .setattr = nfs_setattr, 10617 .listxattr = nfs4_listxattr, 10618 }; 10619 10620 static const struct inode_operations nfs4_file_inode_operations = { 10621 .permission = nfs_permission, 10622 .getattr = nfs_getattr, 10623 .setattr = nfs_setattr, 10624 .listxattr = nfs4_listxattr, 10625 }; 10626 10627 const struct nfs_rpc_ops nfs_v4_clientops = { 10628 .version = 4, /* protocol version */ 10629 .dentry_ops = &nfs4_dentry_operations, 10630 .dir_inode_ops = &nfs4_dir_inode_operations, 10631 .file_inode_ops = &nfs4_file_inode_operations, 10632 .file_ops = &nfs4_file_operations, 10633 .getroot = nfs4_proc_get_root, 10634 .submount = nfs4_submount, 10635 .try_get_tree = nfs4_try_get_tree, 10636 .getattr = nfs4_proc_getattr, 10637 .setattr = nfs4_proc_setattr, 10638 .lookup = nfs4_proc_lookup, 10639 .lookupp = nfs4_proc_lookupp, 10640 .access = nfs4_proc_access, 10641 .readlink = nfs4_proc_readlink, 10642 .create = nfs4_proc_create, 10643 .remove = nfs4_proc_remove, 10644 .unlink_setup = nfs4_proc_unlink_setup, 10645 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10646 .unlink_done = nfs4_proc_unlink_done, 10647 .rename_setup = nfs4_proc_rename_setup, 10648 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10649 .rename_done = nfs4_proc_rename_done, 10650 .link = nfs4_proc_link, 10651 .symlink = nfs4_proc_symlink, 10652 .mkdir = nfs4_proc_mkdir, 10653 .rmdir = nfs4_proc_rmdir, 10654 .readdir = nfs4_proc_readdir, 10655 .mknod = nfs4_proc_mknod, 10656 .statfs = nfs4_proc_statfs, 10657 .fsinfo = nfs4_proc_fsinfo, 10658 .pathconf = nfs4_proc_pathconf, 10659 .set_capabilities = nfs4_server_capabilities, 10660 .decode_dirent = nfs4_decode_dirent, 10661 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10662 .read_setup = nfs4_proc_read_setup, 10663 .read_done = nfs4_read_done, 10664 .write_setup = nfs4_proc_write_setup, 10665 .write_done = nfs4_write_done, 10666 .commit_setup = nfs4_proc_commit_setup, 10667 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10668 .commit_done = nfs4_commit_done, 10669 .lock = nfs4_proc_lock, 10670 .clear_acl_cache = nfs4_zap_acl_attr, 10671 .close_context = nfs4_close_context, 10672 .open_context = nfs4_atomic_open, 10673 .have_delegation = nfs4_have_delegation, 10674 .alloc_client = nfs4_alloc_client, 10675 .init_client = nfs4_init_client, 10676 .free_client = nfs4_free_client, 10677 .create_server = nfs4_create_server, 10678 .clone_server = nfs_clone_server, 10679 .discover_trunking = nfs4_discover_trunking, 10680 .enable_swap = nfs4_enable_swap, 10681 .disable_swap = nfs4_disable_swap, 10682 }; 10683 10684 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10685 .name = XATTR_NAME_NFSV4_ACL, 10686 .list = nfs4_xattr_list_nfs4_acl, 10687 .get = nfs4_xattr_get_nfs4_acl, 10688 .set = nfs4_xattr_set_nfs4_acl, 10689 }; 10690 10691 #if defined(CONFIG_NFS_V4_1) 10692 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10693 .name = XATTR_NAME_NFSV4_DACL, 10694 .list = nfs4_xattr_list_nfs4_dacl, 10695 .get = nfs4_xattr_get_nfs4_dacl, 10696 .set = nfs4_xattr_set_nfs4_dacl, 10697 }; 10698 10699 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10700 .name = XATTR_NAME_NFSV4_SACL, 10701 .list = nfs4_xattr_list_nfs4_sacl, 10702 .get = nfs4_xattr_get_nfs4_sacl, 10703 .set = nfs4_xattr_set_nfs4_sacl, 10704 }; 10705 #endif 10706 10707 #ifdef CONFIG_NFS_V4_2 10708 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10709 .prefix = XATTR_USER_PREFIX, 10710 .get = nfs4_xattr_get_nfs4_user, 10711 .set = nfs4_xattr_set_nfs4_user, 10712 }; 10713 #endif 10714 10715 const struct xattr_handler *nfs4_xattr_handlers[] = { 10716 &nfs4_xattr_nfs4_acl_handler, 10717 #if defined(CONFIG_NFS_V4_1) 10718 &nfs4_xattr_nfs4_dacl_handler, 10719 &nfs4_xattr_nfs4_sacl_handler, 10720 #endif 10721 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10722 &nfs4_xattr_nfs4_label_handler, 10723 #endif 10724 #ifdef CONFIG_NFS_V4_2 10725 &nfs4_xattr_nfs4_user_handler, 10726 #endif 10727 NULL 10728 }; 10729