1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "sysfs.h" 67 #include "nfs4idmap.h" 68 #include "nfs4session.h" 69 #include "fscache.h" 70 #include "nfs42.h" 71 72 #include "nfs4trace.h" 73 74 #define NFSDBG_FACILITY NFSDBG_PROC 75 76 #define NFS4_BITMASK_SZ 3 77 78 #define NFS4_POLL_RETRY_MIN (HZ/10) 79 #define NFS4_POLL_RETRY_MAX (15*HZ) 80 81 /* file attributes which can be mapped to nfs attributes */ 82 #define NFS4_VALID_ATTRS (ATTR_MODE \ 83 | ATTR_UID \ 84 | ATTR_GID \ 85 | ATTR_SIZE \ 86 | ATTR_ATIME \ 87 | ATTR_MTIME \ 88 | ATTR_CTIME \ 89 | ATTR_ATIME_SET \ 90 | ATTR_MTIME_SET) 91 92 struct nfs4_opendata; 93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 97 struct nfs_fattr *fattr, struct inode *inode); 98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 99 struct nfs_fattr *fattr, struct iattr *sattr, 100 struct nfs_open_context *ctx, struct nfs4_label *ilabel); 101 #ifdef CONFIG_NFS_V4_1 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 103 const struct cred *cred, 104 struct nfs4_slot *slot, 105 bool is_privileged); 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 107 const struct cred *); 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 109 const struct cred *, bool); 110 #endif 111 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 113 static inline struct nfs4_label * 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 115 struct iattr *sattr, struct nfs4_label *label) 116 { 117 int err; 118 119 if (label == NULL) 120 return NULL; 121 122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 123 return NULL; 124 125 label->lfs = 0; 126 label->pi = 0; 127 label->len = 0; 128 label->label = NULL; 129 130 err = security_dentry_init_security(dentry, sattr->ia_mode, 131 &dentry->d_name, NULL, 132 (void **)&label->label, &label->len); 133 if (err == 0) 134 return label; 135 136 return NULL; 137 } 138 static inline void 139 nfs4_label_release_security(struct nfs4_label *label) 140 { 141 if (label) 142 security_release_secctx(label->label, label->len); 143 } 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 145 { 146 if (label) 147 return server->attr_bitmask; 148 149 return server->attr_bitmask_nl; 150 } 151 #else 152 static inline struct nfs4_label * 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 154 struct iattr *sattr, struct nfs4_label *l) 155 { return NULL; } 156 static inline void 157 nfs4_label_release_security(struct nfs4_label *label) 158 { return; } 159 static inline u32 * 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 161 { return server->attr_bitmask; } 162 #endif 163 164 /* Prevent leaks of NFSv4 errors into userland */ 165 static int nfs4_map_errors(int err) 166 { 167 if (err >= -1000) 168 return err; 169 switch (err) { 170 case -NFS4ERR_RESOURCE: 171 case -NFS4ERR_LAYOUTTRYLATER: 172 case -NFS4ERR_RECALLCONFLICT: 173 return -EREMOTEIO; 174 case -NFS4ERR_WRONGSEC: 175 case -NFS4ERR_WRONG_CRED: 176 return -EPERM; 177 case -NFS4ERR_BADOWNER: 178 case -NFS4ERR_BADNAME: 179 return -EINVAL; 180 case -NFS4ERR_SHARE_DENIED: 181 return -EACCES; 182 case -NFS4ERR_MINOR_VERS_MISMATCH: 183 return -EPROTONOSUPPORT; 184 case -NFS4ERR_FILE_OPEN: 185 return -EBUSY; 186 case -NFS4ERR_NOT_SAME: 187 return -ENOTSYNC; 188 default: 189 dprintk("%s could not handle NFSv4 error %d\n", 190 __func__, -err); 191 break; 192 } 193 return -EIO; 194 } 195 196 /* 197 * This is our standard bitmap for GETATTR requests. 198 */ 199 const u32 nfs4_fattr_bitmap[3] = { 200 FATTR4_WORD0_TYPE 201 | FATTR4_WORD0_CHANGE 202 | FATTR4_WORD0_SIZE 203 | FATTR4_WORD0_FSID 204 | FATTR4_WORD0_FILEID, 205 FATTR4_WORD1_MODE 206 | FATTR4_WORD1_NUMLINKS 207 | FATTR4_WORD1_OWNER 208 | FATTR4_WORD1_OWNER_GROUP 209 | FATTR4_WORD1_RAWDEV 210 | FATTR4_WORD1_SPACE_USED 211 | FATTR4_WORD1_TIME_ACCESS 212 | FATTR4_WORD1_TIME_METADATA 213 | FATTR4_WORD1_TIME_MODIFY 214 | FATTR4_WORD1_MOUNTED_ON_FILEID, 215 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 216 FATTR4_WORD2_SECURITY_LABEL 217 #endif 218 }; 219 220 static const u32 nfs4_pnfs_open_bitmap[3] = { 221 FATTR4_WORD0_TYPE 222 | FATTR4_WORD0_CHANGE 223 | FATTR4_WORD0_SIZE 224 | FATTR4_WORD0_FSID 225 | FATTR4_WORD0_FILEID, 226 FATTR4_WORD1_MODE 227 | FATTR4_WORD1_NUMLINKS 228 | FATTR4_WORD1_OWNER 229 | FATTR4_WORD1_OWNER_GROUP 230 | FATTR4_WORD1_RAWDEV 231 | FATTR4_WORD1_SPACE_USED 232 | FATTR4_WORD1_TIME_ACCESS 233 | FATTR4_WORD1_TIME_METADATA 234 | FATTR4_WORD1_TIME_MODIFY, 235 FATTR4_WORD2_MDSTHRESHOLD 236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 237 | FATTR4_WORD2_SECURITY_LABEL 238 #endif 239 }; 240 241 static const u32 nfs4_open_noattr_bitmap[3] = { 242 FATTR4_WORD0_TYPE 243 | FATTR4_WORD0_FILEID, 244 }; 245 246 const u32 nfs4_statfs_bitmap[3] = { 247 FATTR4_WORD0_FILES_AVAIL 248 | FATTR4_WORD0_FILES_FREE 249 | FATTR4_WORD0_FILES_TOTAL, 250 FATTR4_WORD1_SPACE_AVAIL 251 | FATTR4_WORD1_SPACE_FREE 252 | FATTR4_WORD1_SPACE_TOTAL 253 }; 254 255 const u32 nfs4_pathconf_bitmap[3] = { 256 FATTR4_WORD0_MAXLINK 257 | FATTR4_WORD0_MAXNAME, 258 0 259 }; 260 261 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 262 | FATTR4_WORD0_MAXREAD 263 | FATTR4_WORD0_MAXWRITE 264 | FATTR4_WORD0_LEASE_TIME, 265 FATTR4_WORD1_TIME_DELTA 266 | FATTR4_WORD1_FS_LAYOUT_TYPES, 267 FATTR4_WORD2_LAYOUT_BLKSIZE 268 | FATTR4_WORD2_CLONE_BLKSIZE 269 | FATTR4_WORD2_CHANGE_ATTR_TYPE 270 | FATTR4_WORD2_XATTR_SUPPORT 271 }; 272 273 const u32 nfs4_fs_locations_bitmap[3] = { 274 FATTR4_WORD0_CHANGE 275 | FATTR4_WORD0_SIZE 276 | FATTR4_WORD0_FSID 277 | FATTR4_WORD0_FILEID 278 | FATTR4_WORD0_FS_LOCATIONS, 279 FATTR4_WORD1_OWNER 280 | FATTR4_WORD1_OWNER_GROUP 281 | FATTR4_WORD1_RAWDEV 282 | FATTR4_WORD1_SPACE_USED 283 | FATTR4_WORD1_TIME_ACCESS 284 | FATTR4_WORD1_TIME_METADATA 285 | FATTR4_WORD1_TIME_MODIFY 286 | FATTR4_WORD1_MOUNTED_ON_FILEID, 287 }; 288 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 290 struct inode *inode, unsigned long flags) 291 { 292 unsigned long cache_validity; 293 294 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 295 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 296 return; 297 298 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 299 300 /* Remove the attributes over which we have full control */ 301 dst[1] &= ~FATTR4_WORD1_RAWDEV; 302 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 303 dst[0] &= ~FATTR4_WORD0_SIZE; 304 305 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 306 dst[0] &= ~FATTR4_WORD0_CHANGE; 307 308 if (!(cache_validity & NFS_INO_INVALID_MODE)) 309 dst[1] &= ~FATTR4_WORD1_MODE; 310 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 311 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 312 } 313 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 315 struct nfs4_readdir_arg *readdir) 316 { 317 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 318 __be32 *start, *p; 319 320 if (cookie > 2) { 321 readdir->cookie = cookie; 322 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 323 return; 324 } 325 326 readdir->cookie = 0; 327 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 328 if (cookie == 2) 329 return; 330 331 /* 332 * NFSv4 servers do not return entries for '.' and '..' 333 * Therefore, we fake these entries here. We let '.' 334 * have cookie 0 and '..' have cookie 1. Note that 335 * when talking to the server, we always send cookie 0 336 * instead of 1 or 2. 337 */ 338 start = p = kmap_atomic(*readdir->pages); 339 340 if (cookie == 0) { 341 *p++ = xdr_one; /* next */ 342 *p++ = xdr_zero; /* cookie, first word */ 343 *p++ = xdr_one; /* cookie, second word */ 344 *p++ = xdr_one; /* entry len */ 345 memcpy(p, ".\0\0\0", 4); /* entry */ 346 p++; 347 *p++ = xdr_one; /* bitmap length */ 348 *p++ = htonl(attrs); /* bitmap */ 349 *p++ = htonl(12); /* attribute buffer length */ 350 *p++ = htonl(NF4DIR); 351 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 352 } 353 354 *p++ = xdr_one; /* next */ 355 *p++ = xdr_zero; /* cookie, first word */ 356 *p++ = xdr_two; /* cookie, second word */ 357 *p++ = xdr_two; /* entry len */ 358 memcpy(p, "..\0\0", 4); /* entry */ 359 p++; 360 *p++ = xdr_one; /* bitmap length */ 361 *p++ = htonl(attrs); /* bitmap */ 362 *p++ = htonl(12); /* attribute buffer length */ 363 *p++ = htonl(NF4DIR); 364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 365 366 readdir->pgbase = (char *)p - (char *)start; 367 readdir->count -= readdir->pgbase; 368 kunmap_atomic(start); 369 } 370 371 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 372 { 373 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 374 fattr->pre_change_attr = version; 375 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 376 } 377 } 378 379 static void nfs4_test_and_free_stateid(struct nfs_server *server, 380 nfs4_stateid *stateid, 381 const struct cred *cred) 382 { 383 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 384 385 ops->test_and_free_expired(server, stateid, cred); 386 } 387 388 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 389 nfs4_stateid *stateid, 390 const struct cred *cred) 391 { 392 stateid->type = NFS4_REVOKED_STATEID_TYPE; 393 nfs4_test_and_free_stateid(server, stateid, cred); 394 } 395 396 static void nfs4_free_revoked_stateid(struct nfs_server *server, 397 const nfs4_stateid *stateid, 398 const struct cred *cred) 399 { 400 nfs4_stateid tmp; 401 402 nfs4_stateid_copy(&tmp, stateid); 403 __nfs4_free_revoked_stateid(server, &tmp, cred); 404 } 405 406 static long nfs4_update_delay(long *timeout) 407 { 408 long ret; 409 if (!timeout) 410 return NFS4_POLL_RETRY_MAX; 411 if (*timeout <= 0) 412 *timeout = NFS4_POLL_RETRY_MIN; 413 if (*timeout > NFS4_POLL_RETRY_MAX) 414 *timeout = NFS4_POLL_RETRY_MAX; 415 ret = *timeout; 416 *timeout <<= 1; 417 return ret; 418 } 419 420 static int nfs4_delay_killable(long *timeout) 421 { 422 might_sleep(); 423 424 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 425 schedule_timeout(nfs4_update_delay(timeout)); 426 if (!__fatal_signal_pending(current)) 427 return 0; 428 return -EINTR; 429 } 430 431 static int nfs4_delay_interruptible(long *timeout) 432 { 433 might_sleep(); 434 435 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 436 schedule_timeout(nfs4_update_delay(timeout)); 437 if (!signal_pending(current)) 438 return 0; 439 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 440 } 441 442 static int nfs4_delay(long *timeout, bool interruptible) 443 { 444 if (interruptible) 445 return nfs4_delay_interruptible(timeout); 446 return nfs4_delay_killable(timeout); 447 } 448 449 static const nfs4_stateid * 450 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 451 { 452 if (!stateid) 453 return NULL; 454 switch (stateid->type) { 455 case NFS4_OPEN_STATEID_TYPE: 456 case NFS4_LOCK_STATEID_TYPE: 457 case NFS4_DELEGATION_STATEID_TYPE: 458 return stateid; 459 default: 460 break; 461 } 462 return NULL; 463 } 464 465 /* This is the error handling routine for processes that are allowed 466 * to sleep. 467 */ 468 static int nfs4_do_handle_exception(struct nfs_server *server, 469 int errorcode, struct nfs4_exception *exception) 470 { 471 struct nfs_client *clp = server->nfs_client; 472 struct nfs4_state *state = exception->state; 473 const nfs4_stateid *stateid; 474 struct inode *inode = exception->inode; 475 int ret = errorcode; 476 477 exception->delay = 0; 478 exception->recovering = 0; 479 exception->retry = 0; 480 481 stateid = nfs4_recoverable_stateid(exception->stateid); 482 if (stateid == NULL && state != NULL) 483 stateid = nfs4_recoverable_stateid(&state->stateid); 484 485 switch(errorcode) { 486 case 0: 487 return 0; 488 case -NFS4ERR_BADHANDLE: 489 case -ESTALE: 490 if (inode != NULL && S_ISREG(inode->i_mode)) 491 pnfs_destroy_layout(NFS_I(inode)); 492 break; 493 case -NFS4ERR_DELEG_REVOKED: 494 case -NFS4ERR_ADMIN_REVOKED: 495 case -NFS4ERR_EXPIRED: 496 case -NFS4ERR_BAD_STATEID: 497 case -NFS4ERR_PARTNER_NO_AUTH: 498 if (inode != NULL && stateid != NULL) { 499 nfs_inode_find_state_and_recover(inode, 500 stateid); 501 goto wait_on_recovery; 502 } 503 fallthrough; 504 case -NFS4ERR_OPENMODE: 505 if (inode) { 506 int err; 507 508 err = nfs_async_inode_return_delegation(inode, 509 stateid); 510 if (err == 0) 511 goto wait_on_recovery; 512 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 513 exception->retry = 1; 514 break; 515 } 516 } 517 if (state == NULL) 518 break; 519 ret = nfs4_schedule_stateid_recovery(server, state); 520 if (ret < 0) 521 break; 522 goto wait_on_recovery; 523 case -NFS4ERR_STALE_STATEID: 524 case -NFS4ERR_STALE_CLIENTID: 525 nfs4_schedule_lease_recovery(clp); 526 goto wait_on_recovery; 527 case -NFS4ERR_MOVED: 528 ret = nfs4_schedule_migration_recovery(server); 529 if (ret < 0) 530 break; 531 goto wait_on_recovery; 532 case -NFS4ERR_LEASE_MOVED: 533 nfs4_schedule_lease_moved_recovery(clp); 534 goto wait_on_recovery; 535 #if defined(CONFIG_NFS_V4_1) 536 case -NFS4ERR_BADSESSION: 537 case -NFS4ERR_BADSLOT: 538 case -NFS4ERR_BAD_HIGH_SLOT: 539 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 540 case -NFS4ERR_DEADSESSION: 541 case -NFS4ERR_SEQ_FALSE_RETRY: 542 case -NFS4ERR_SEQ_MISORDERED: 543 /* Handled in nfs41_sequence_process() */ 544 goto wait_on_recovery; 545 #endif /* defined(CONFIG_NFS_V4_1) */ 546 case -NFS4ERR_FILE_OPEN: 547 if (exception->timeout > HZ) { 548 /* We have retried a decent amount, time to 549 * fail 550 */ 551 ret = -EBUSY; 552 break; 553 } 554 fallthrough; 555 case -NFS4ERR_DELAY: 556 nfs_inc_server_stats(server, NFSIOS_DELAY); 557 fallthrough; 558 case -NFS4ERR_GRACE: 559 case -NFS4ERR_LAYOUTTRYLATER: 560 case -NFS4ERR_RECALLCONFLICT: 561 exception->delay = 1; 562 return 0; 563 564 case -NFS4ERR_RETRY_UNCACHED_REP: 565 case -NFS4ERR_OLD_STATEID: 566 exception->retry = 1; 567 break; 568 case -NFS4ERR_BADOWNER: 569 /* The following works around a Linux server bug! */ 570 case -NFS4ERR_BADNAME: 571 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 572 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 573 exception->retry = 1; 574 printk(KERN_WARNING "NFS: v4 server %s " 575 "does not accept raw " 576 "uid/gids. " 577 "Reenabling the idmapper.\n", 578 server->nfs_client->cl_hostname); 579 } 580 } 581 /* We failed to handle the error */ 582 return nfs4_map_errors(ret); 583 wait_on_recovery: 584 exception->recovering = 1; 585 return 0; 586 } 587 588 /* This is the error handling routine for processes that are allowed 589 * to sleep. 590 */ 591 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 592 { 593 struct nfs_client *clp = server->nfs_client; 594 int ret; 595 596 ret = nfs4_do_handle_exception(server, errorcode, exception); 597 if (exception->delay) { 598 ret = nfs4_delay(&exception->timeout, 599 exception->interruptible); 600 goto out_retry; 601 } 602 if (exception->recovering) { 603 if (exception->task_is_privileged) 604 return -EDEADLOCK; 605 ret = nfs4_wait_clnt_recover(clp); 606 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 607 return -EIO; 608 goto out_retry; 609 } 610 return ret; 611 out_retry: 612 if (ret == 0) 613 exception->retry = 1; 614 return ret; 615 } 616 617 static int 618 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 619 int errorcode, struct nfs4_exception *exception) 620 { 621 struct nfs_client *clp = server->nfs_client; 622 int ret; 623 624 ret = nfs4_do_handle_exception(server, errorcode, exception); 625 if (exception->delay) { 626 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 627 goto out_retry; 628 } 629 if (exception->recovering) { 630 if (exception->task_is_privileged) 631 return -EDEADLOCK; 632 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 633 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 634 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 635 goto out_retry; 636 } 637 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 638 ret = -EIO; 639 return ret; 640 out_retry: 641 if (ret == 0) { 642 exception->retry = 1; 643 /* 644 * For NFS4ERR_MOVED, the client transport will need to 645 * be recomputed after migration recovery has completed. 646 */ 647 if (errorcode == -NFS4ERR_MOVED) 648 rpc_task_release_transport(task); 649 } 650 return ret; 651 } 652 653 int 654 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 655 struct nfs4_state *state, long *timeout) 656 { 657 struct nfs4_exception exception = { 658 .state = state, 659 }; 660 661 if (task->tk_status >= 0) 662 return 0; 663 if (timeout) 664 exception.timeout = *timeout; 665 task->tk_status = nfs4_async_handle_exception(task, server, 666 task->tk_status, 667 &exception); 668 if (exception.delay && timeout) 669 *timeout = exception.timeout; 670 if (exception.retry) 671 return -EAGAIN; 672 return 0; 673 } 674 675 /* 676 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 677 * or 'false' otherwise. 678 */ 679 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 680 { 681 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 682 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 683 } 684 685 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 686 { 687 spin_lock(&clp->cl_lock); 688 if (time_before(clp->cl_last_renewal,timestamp)) 689 clp->cl_last_renewal = timestamp; 690 spin_unlock(&clp->cl_lock); 691 } 692 693 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 694 { 695 struct nfs_client *clp = server->nfs_client; 696 697 if (!nfs4_has_session(clp)) 698 do_renew_lease(clp, timestamp); 699 } 700 701 struct nfs4_call_sync_data { 702 const struct nfs_server *seq_server; 703 struct nfs4_sequence_args *seq_args; 704 struct nfs4_sequence_res *seq_res; 705 }; 706 707 void nfs4_init_sequence(struct nfs4_sequence_args *args, 708 struct nfs4_sequence_res *res, int cache_reply, 709 int privileged) 710 { 711 args->sa_slot = NULL; 712 args->sa_cache_this = cache_reply; 713 args->sa_privileged = privileged; 714 715 res->sr_slot = NULL; 716 } 717 718 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 719 { 720 struct nfs4_slot *slot = res->sr_slot; 721 struct nfs4_slot_table *tbl; 722 723 tbl = slot->table; 724 spin_lock(&tbl->slot_tbl_lock); 725 if (!nfs41_wake_and_assign_slot(tbl, slot)) 726 nfs4_free_slot(tbl, slot); 727 spin_unlock(&tbl->slot_tbl_lock); 728 729 res->sr_slot = NULL; 730 } 731 732 static int nfs40_sequence_done(struct rpc_task *task, 733 struct nfs4_sequence_res *res) 734 { 735 if (res->sr_slot != NULL) 736 nfs40_sequence_free_slot(res); 737 return 1; 738 } 739 740 #if defined(CONFIG_NFS_V4_1) 741 742 static void nfs41_release_slot(struct nfs4_slot *slot) 743 { 744 struct nfs4_session *session; 745 struct nfs4_slot_table *tbl; 746 bool send_new_highest_used_slotid = false; 747 748 if (!slot) 749 return; 750 tbl = slot->table; 751 session = tbl->session; 752 753 /* Bump the slot sequence number */ 754 if (slot->seq_done) 755 slot->seq_nr++; 756 slot->seq_done = 0; 757 758 spin_lock(&tbl->slot_tbl_lock); 759 /* Be nice to the server: try to ensure that the last transmitted 760 * value for highest_user_slotid <= target_highest_slotid 761 */ 762 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 763 send_new_highest_used_slotid = true; 764 765 if (nfs41_wake_and_assign_slot(tbl, slot)) { 766 send_new_highest_used_slotid = false; 767 goto out_unlock; 768 } 769 nfs4_free_slot(tbl, slot); 770 771 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 772 send_new_highest_used_slotid = false; 773 out_unlock: 774 spin_unlock(&tbl->slot_tbl_lock); 775 if (send_new_highest_used_slotid) 776 nfs41_notify_server(session->clp); 777 if (waitqueue_active(&tbl->slot_waitq)) 778 wake_up_all(&tbl->slot_waitq); 779 } 780 781 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 782 { 783 nfs41_release_slot(res->sr_slot); 784 res->sr_slot = NULL; 785 } 786 787 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 788 u32 seqnr) 789 { 790 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 791 slot->seq_nr_highest_sent = seqnr; 792 } 793 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 794 { 795 nfs4_slot_sequence_record_sent(slot, seqnr); 796 slot->seq_nr_last_acked = seqnr; 797 } 798 799 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 800 struct nfs4_slot *slot) 801 { 802 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 803 if (!IS_ERR(task)) 804 rpc_put_task_async(task); 805 } 806 807 static int nfs41_sequence_process(struct rpc_task *task, 808 struct nfs4_sequence_res *res) 809 { 810 struct nfs4_session *session; 811 struct nfs4_slot *slot = res->sr_slot; 812 struct nfs_client *clp; 813 int status; 814 int ret = 1; 815 816 if (slot == NULL) 817 goto out_noaction; 818 /* don't increment the sequence number if the task wasn't sent */ 819 if (!RPC_WAS_SENT(task) || slot->seq_done) 820 goto out; 821 822 session = slot->table->session; 823 clp = session->clp; 824 825 trace_nfs4_sequence_done(session, res); 826 827 status = res->sr_status; 828 if (task->tk_status == -NFS4ERR_DEADSESSION) 829 status = -NFS4ERR_DEADSESSION; 830 831 /* Check the SEQUENCE operation status */ 832 switch (status) { 833 case 0: 834 /* Mark this sequence number as having been acked */ 835 nfs4_slot_sequence_acked(slot, slot->seq_nr); 836 /* Update the slot's sequence and clientid lease timer */ 837 slot->seq_done = 1; 838 do_renew_lease(clp, res->sr_timestamp); 839 /* Check sequence flags */ 840 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 841 !!slot->privileged); 842 nfs41_update_target_slotid(slot->table, slot, res); 843 break; 844 case 1: 845 /* 846 * sr_status remains 1 if an RPC level error occurred. 847 * The server may or may not have processed the sequence 848 * operation.. 849 */ 850 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 851 slot->seq_done = 1; 852 goto out; 853 case -NFS4ERR_DELAY: 854 /* The server detected a resend of the RPC call and 855 * returned NFS4ERR_DELAY as per Section 2.10.6.2 856 * of RFC5661. 857 */ 858 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 859 __func__, 860 slot->slot_nr, 861 slot->seq_nr); 862 goto out_retry; 863 case -NFS4ERR_RETRY_UNCACHED_REP: 864 case -NFS4ERR_SEQ_FALSE_RETRY: 865 /* 866 * The server thinks we tried to replay a request. 867 * Retry the call after bumping the sequence ID. 868 */ 869 nfs4_slot_sequence_acked(slot, slot->seq_nr); 870 goto retry_new_seq; 871 case -NFS4ERR_BADSLOT: 872 /* 873 * The slot id we used was probably retired. Try again 874 * using a different slot id. 875 */ 876 if (slot->slot_nr < slot->table->target_highest_slotid) 877 goto session_recover; 878 goto retry_nowait; 879 case -NFS4ERR_SEQ_MISORDERED: 880 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 881 /* 882 * Were one or more calls using this slot interrupted? 883 * If the server never received the request, then our 884 * transmitted slot sequence number may be too high. However, 885 * if the server did receive the request then it might 886 * accidentally give us a reply with a mismatched operation. 887 * We can sort this out by sending a lone sequence operation 888 * to the server on the same slot. 889 */ 890 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 891 slot->seq_nr--; 892 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 893 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 894 res->sr_slot = NULL; 895 } 896 goto retry_nowait; 897 } 898 /* 899 * RFC5661: 900 * A retry might be sent while the original request is 901 * still in progress on the replier. The replier SHOULD 902 * deal with the issue by returning NFS4ERR_DELAY as the 903 * reply to SEQUENCE or CB_SEQUENCE operation, but 904 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 905 * 906 * Restart the search after a delay. 907 */ 908 slot->seq_nr = slot->seq_nr_highest_sent; 909 goto out_retry; 910 case -NFS4ERR_BADSESSION: 911 case -NFS4ERR_DEADSESSION: 912 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 913 goto session_recover; 914 default: 915 /* Just update the slot sequence no. */ 916 slot->seq_done = 1; 917 } 918 out: 919 /* The session may be reset by one of the error handlers. */ 920 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 921 out_noaction: 922 return ret; 923 session_recover: 924 nfs4_schedule_session_recovery(session, status); 925 dprintk("%s ERROR: %d Reset session\n", __func__, status); 926 nfs41_sequence_free_slot(res); 927 goto out; 928 retry_new_seq: 929 ++slot->seq_nr; 930 retry_nowait: 931 if (rpc_restart_call_prepare(task)) { 932 nfs41_sequence_free_slot(res); 933 task->tk_status = 0; 934 ret = 0; 935 } 936 goto out; 937 out_retry: 938 if (!rpc_restart_call(task)) 939 goto out; 940 rpc_delay(task, NFS4_POLL_RETRY_MAX); 941 return 0; 942 } 943 944 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 945 { 946 if (!nfs41_sequence_process(task, res)) 947 return 0; 948 if (res->sr_slot != NULL) 949 nfs41_sequence_free_slot(res); 950 return 1; 951 952 } 953 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 954 955 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 956 { 957 if (res->sr_slot == NULL) 958 return 1; 959 if (res->sr_slot->table->session != NULL) 960 return nfs41_sequence_process(task, res); 961 return nfs40_sequence_done(task, res); 962 } 963 964 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 965 { 966 if (res->sr_slot != NULL) { 967 if (res->sr_slot->table->session != NULL) 968 nfs41_sequence_free_slot(res); 969 else 970 nfs40_sequence_free_slot(res); 971 } 972 } 973 974 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 975 { 976 if (res->sr_slot == NULL) 977 return 1; 978 if (!res->sr_slot->table->session) 979 return nfs40_sequence_done(task, res); 980 return nfs41_sequence_done(task, res); 981 } 982 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 983 984 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 985 { 986 struct nfs4_call_sync_data *data = calldata; 987 988 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 989 990 nfs4_setup_sequence(data->seq_server->nfs_client, 991 data->seq_args, data->seq_res, task); 992 } 993 994 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 995 { 996 struct nfs4_call_sync_data *data = calldata; 997 998 nfs41_sequence_done(task, data->seq_res); 999 } 1000 1001 static const struct rpc_call_ops nfs41_call_sync_ops = { 1002 .rpc_call_prepare = nfs41_call_sync_prepare, 1003 .rpc_call_done = nfs41_call_sync_done, 1004 }; 1005 1006 #else /* !CONFIG_NFS_V4_1 */ 1007 1008 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1009 { 1010 return nfs40_sequence_done(task, res); 1011 } 1012 1013 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1014 { 1015 if (res->sr_slot != NULL) 1016 nfs40_sequence_free_slot(res); 1017 } 1018 1019 int nfs4_sequence_done(struct rpc_task *task, 1020 struct nfs4_sequence_res *res) 1021 { 1022 return nfs40_sequence_done(task, res); 1023 } 1024 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1025 1026 #endif /* !CONFIG_NFS_V4_1 */ 1027 1028 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1029 { 1030 res->sr_timestamp = jiffies; 1031 res->sr_status_flags = 0; 1032 res->sr_status = 1; 1033 } 1034 1035 static 1036 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1037 struct nfs4_sequence_res *res, 1038 struct nfs4_slot *slot) 1039 { 1040 if (!slot) 1041 return; 1042 slot->privileged = args->sa_privileged ? 1 : 0; 1043 args->sa_slot = slot; 1044 1045 res->sr_slot = slot; 1046 } 1047 1048 int nfs4_setup_sequence(struct nfs_client *client, 1049 struct nfs4_sequence_args *args, 1050 struct nfs4_sequence_res *res, 1051 struct rpc_task *task) 1052 { 1053 struct nfs4_session *session = nfs4_get_session(client); 1054 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1055 struct nfs4_slot *slot; 1056 1057 /* slot already allocated? */ 1058 if (res->sr_slot != NULL) 1059 goto out_start; 1060 1061 if (session) 1062 tbl = &session->fc_slot_table; 1063 1064 spin_lock(&tbl->slot_tbl_lock); 1065 /* The state manager will wait until the slot table is empty */ 1066 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1067 goto out_sleep; 1068 1069 slot = nfs4_alloc_slot(tbl); 1070 if (IS_ERR(slot)) { 1071 if (slot == ERR_PTR(-ENOMEM)) 1072 goto out_sleep_timeout; 1073 goto out_sleep; 1074 } 1075 spin_unlock(&tbl->slot_tbl_lock); 1076 1077 nfs4_sequence_attach_slot(args, res, slot); 1078 1079 trace_nfs4_setup_sequence(session, args); 1080 out_start: 1081 nfs41_sequence_res_init(res); 1082 rpc_call_start(task); 1083 return 0; 1084 out_sleep_timeout: 1085 /* Try again in 1/4 second */ 1086 if (args->sa_privileged) 1087 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1088 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1089 else 1090 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1091 NULL, jiffies + (HZ >> 2)); 1092 spin_unlock(&tbl->slot_tbl_lock); 1093 return -EAGAIN; 1094 out_sleep: 1095 if (args->sa_privileged) 1096 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1097 RPC_PRIORITY_PRIVILEGED); 1098 else 1099 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1100 spin_unlock(&tbl->slot_tbl_lock); 1101 return -EAGAIN; 1102 } 1103 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1104 1105 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1106 { 1107 struct nfs4_call_sync_data *data = calldata; 1108 nfs4_setup_sequence(data->seq_server->nfs_client, 1109 data->seq_args, data->seq_res, task); 1110 } 1111 1112 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1113 { 1114 struct nfs4_call_sync_data *data = calldata; 1115 nfs4_sequence_done(task, data->seq_res); 1116 } 1117 1118 static const struct rpc_call_ops nfs40_call_sync_ops = { 1119 .rpc_call_prepare = nfs40_call_sync_prepare, 1120 .rpc_call_done = nfs40_call_sync_done, 1121 }; 1122 1123 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1124 { 1125 int ret; 1126 struct rpc_task *task; 1127 1128 task = rpc_run_task(task_setup); 1129 if (IS_ERR(task)) 1130 return PTR_ERR(task); 1131 1132 ret = task->tk_status; 1133 rpc_put_task(task); 1134 return ret; 1135 } 1136 1137 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1138 struct nfs_server *server, 1139 struct rpc_message *msg, 1140 struct nfs4_sequence_args *args, 1141 struct nfs4_sequence_res *res, 1142 unsigned short task_flags) 1143 { 1144 struct nfs_client *clp = server->nfs_client; 1145 struct nfs4_call_sync_data data = { 1146 .seq_server = server, 1147 .seq_args = args, 1148 .seq_res = res, 1149 }; 1150 struct rpc_task_setup task_setup = { 1151 .rpc_client = clnt, 1152 .rpc_message = msg, 1153 .callback_ops = clp->cl_mvops->call_sync_ops, 1154 .callback_data = &data, 1155 .flags = task_flags, 1156 }; 1157 1158 return nfs4_call_sync_custom(&task_setup); 1159 } 1160 1161 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1162 struct nfs_server *server, 1163 struct rpc_message *msg, 1164 struct nfs4_sequence_args *args, 1165 struct nfs4_sequence_res *res) 1166 { 1167 unsigned short task_flags = 0; 1168 1169 if (server->caps & NFS_CAP_MOVEABLE) 1170 task_flags = RPC_TASK_MOVEABLE; 1171 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1172 } 1173 1174 1175 int nfs4_call_sync(struct rpc_clnt *clnt, 1176 struct nfs_server *server, 1177 struct rpc_message *msg, 1178 struct nfs4_sequence_args *args, 1179 struct nfs4_sequence_res *res, 1180 int cache_reply) 1181 { 1182 nfs4_init_sequence(args, res, cache_reply, 0); 1183 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1184 } 1185 1186 static void 1187 nfs4_inc_nlink_locked(struct inode *inode) 1188 { 1189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1190 NFS_INO_INVALID_CTIME | 1191 NFS_INO_INVALID_NLINK); 1192 inc_nlink(inode); 1193 } 1194 1195 static void 1196 nfs4_inc_nlink(struct inode *inode) 1197 { 1198 spin_lock(&inode->i_lock); 1199 nfs4_inc_nlink_locked(inode); 1200 spin_unlock(&inode->i_lock); 1201 } 1202 1203 static void 1204 nfs4_dec_nlink_locked(struct inode *inode) 1205 { 1206 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1207 NFS_INO_INVALID_CTIME | 1208 NFS_INO_INVALID_NLINK); 1209 drop_nlink(inode); 1210 } 1211 1212 static void 1213 nfs4_update_changeattr_locked(struct inode *inode, 1214 struct nfs4_change_info *cinfo, 1215 unsigned long timestamp, unsigned long cache_validity) 1216 { 1217 struct nfs_inode *nfsi = NFS_I(inode); 1218 u64 change_attr = inode_peek_iversion_raw(inode); 1219 1220 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1221 if (S_ISDIR(inode->i_mode)) 1222 cache_validity |= NFS_INO_INVALID_DATA; 1223 1224 switch (NFS_SERVER(inode)->change_attr_type) { 1225 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1226 if (cinfo->after == change_attr) 1227 goto out; 1228 break; 1229 default: 1230 if ((s64)(change_attr - cinfo->after) >= 0) 1231 goto out; 1232 } 1233 1234 inode_set_iversion_raw(inode, cinfo->after); 1235 if (!cinfo->atomic || cinfo->before != change_attr) { 1236 if (S_ISDIR(inode->i_mode)) 1237 nfs_force_lookup_revalidate(inode); 1238 1239 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1240 cache_validity |= 1241 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1242 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1243 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1244 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1245 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1246 } 1247 nfsi->attrtimeo_timestamp = jiffies; 1248 nfsi->read_cache_jiffies = timestamp; 1249 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1250 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1251 out: 1252 nfs_set_cache_invalid(inode, cache_validity); 1253 } 1254 1255 void 1256 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1257 unsigned long timestamp, unsigned long cache_validity) 1258 { 1259 spin_lock(&dir->i_lock); 1260 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1261 spin_unlock(&dir->i_lock); 1262 } 1263 1264 struct nfs4_open_createattrs { 1265 struct nfs4_label *label; 1266 struct iattr *sattr; 1267 const __u32 verf[2]; 1268 }; 1269 1270 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1271 int err, struct nfs4_exception *exception) 1272 { 1273 if (err != -EINVAL) 1274 return false; 1275 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1276 return false; 1277 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1278 exception->retry = 1; 1279 return true; 1280 } 1281 1282 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1283 { 1284 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1285 } 1286 1287 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1288 { 1289 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1290 1291 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1292 } 1293 1294 static u32 1295 nfs4_map_atomic_open_share(struct nfs_server *server, 1296 fmode_t fmode, int openflags) 1297 { 1298 u32 res = 0; 1299 1300 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1301 case FMODE_READ: 1302 res = NFS4_SHARE_ACCESS_READ; 1303 break; 1304 case FMODE_WRITE: 1305 res = NFS4_SHARE_ACCESS_WRITE; 1306 break; 1307 case FMODE_READ|FMODE_WRITE: 1308 res = NFS4_SHARE_ACCESS_BOTH; 1309 } 1310 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1311 goto out; 1312 /* Want no delegation if we're using O_DIRECT */ 1313 if (openflags & O_DIRECT) 1314 res |= NFS4_SHARE_WANT_NO_DELEG; 1315 out: 1316 return res; 1317 } 1318 1319 static enum open_claim_type4 1320 nfs4_map_atomic_open_claim(struct nfs_server *server, 1321 enum open_claim_type4 claim) 1322 { 1323 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1324 return claim; 1325 switch (claim) { 1326 default: 1327 return claim; 1328 case NFS4_OPEN_CLAIM_FH: 1329 return NFS4_OPEN_CLAIM_NULL; 1330 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1331 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1332 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1333 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1334 } 1335 } 1336 1337 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1338 { 1339 p->o_res.f_attr = &p->f_attr; 1340 p->o_res.seqid = p->o_arg.seqid; 1341 p->c_res.seqid = p->c_arg.seqid; 1342 p->o_res.server = p->o_arg.server; 1343 p->o_res.access_request = p->o_arg.access; 1344 nfs_fattr_init(&p->f_attr); 1345 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1346 } 1347 1348 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1349 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1350 const struct nfs4_open_createattrs *c, 1351 enum open_claim_type4 claim, 1352 gfp_t gfp_mask) 1353 { 1354 struct dentry *parent = dget_parent(dentry); 1355 struct inode *dir = d_inode(parent); 1356 struct nfs_server *server = NFS_SERVER(dir); 1357 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1358 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1359 struct nfs4_opendata *p; 1360 1361 p = kzalloc(sizeof(*p), gfp_mask); 1362 if (p == NULL) 1363 goto err; 1364 1365 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1366 if (IS_ERR(p->f_attr.label)) 1367 goto err_free_p; 1368 1369 p->a_label = nfs4_label_alloc(server, gfp_mask); 1370 if (IS_ERR(p->a_label)) 1371 goto err_free_f; 1372 1373 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1374 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1375 if (IS_ERR(p->o_arg.seqid)) 1376 goto err_free_label; 1377 nfs_sb_active(dentry->d_sb); 1378 p->dentry = dget(dentry); 1379 p->dir = parent; 1380 p->owner = sp; 1381 atomic_inc(&sp->so_count); 1382 p->o_arg.open_flags = flags; 1383 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1384 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1385 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1386 fmode, flags); 1387 if (flags & O_CREAT) { 1388 p->o_arg.umask = current_umask(); 1389 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1390 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1391 p->o_arg.u.attrs = &p->attrs; 1392 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1393 1394 memcpy(p->o_arg.u.verifier.data, c->verf, 1395 sizeof(p->o_arg.u.verifier.data)); 1396 } 1397 } 1398 /* ask server to check for all possible rights as results 1399 * are cached */ 1400 switch (p->o_arg.claim) { 1401 default: 1402 break; 1403 case NFS4_OPEN_CLAIM_NULL: 1404 case NFS4_OPEN_CLAIM_FH: 1405 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1406 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1407 NFS4_ACCESS_EXECUTE | 1408 nfs_access_xattr_mask(server); 1409 } 1410 p->o_arg.clientid = server->nfs_client->cl_clientid; 1411 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1412 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1413 p->o_arg.name = &dentry->d_name; 1414 p->o_arg.server = server; 1415 p->o_arg.bitmask = nfs4_bitmask(server, label); 1416 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1417 switch (p->o_arg.claim) { 1418 case NFS4_OPEN_CLAIM_NULL: 1419 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1420 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1421 p->o_arg.fh = NFS_FH(dir); 1422 break; 1423 case NFS4_OPEN_CLAIM_PREVIOUS: 1424 case NFS4_OPEN_CLAIM_FH: 1425 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1426 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1427 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1428 } 1429 p->c_arg.fh = &p->o_res.fh; 1430 p->c_arg.stateid = &p->o_res.stateid; 1431 p->c_arg.seqid = p->o_arg.seqid; 1432 nfs4_init_opendata_res(p); 1433 kref_init(&p->kref); 1434 return p; 1435 1436 err_free_label: 1437 nfs4_label_free(p->a_label); 1438 err_free_f: 1439 nfs4_label_free(p->f_attr.label); 1440 err_free_p: 1441 kfree(p); 1442 err: 1443 dput(parent); 1444 return NULL; 1445 } 1446 1447 static void nfs4_opendata_free(struct kref *kref) 1448 { 1449 struct nfs4_opendata *p = container_of(kref, 1450 struct nfs4_opendata, kref); 1451 struct super_block *sb = p->dentry->d_sb; 1452 1453 nfs4_lgopen_release(p->lgp); 1454 nfs_free_seqid(p->o_arg.seqid); 1455 nfs4_sequence_free_slot(&p->o_res.seq_res); 1456 if (p->state != NULL) 1457 nfs4_put_open_state(p->state); 1458 nfs4_put_state_owner(p->owner); 1459 1460 nfs4_label_free(p->a_label); 1461 nfs4_label_free(p->f_attr.label); 1462 1463 dput(p->dir); 1464 dput(p->dentry); 1465 nfs_sb_deactive(sb); 1466 nfs_fattr_free_names(&p->f_attr); 1467 kfree(p->f_attr.mdsthreshold); 1468 kfree(p); 1469 } 1470 1471 static void nfs4_opendata_put(struct nfs4_opendata *p) 1472 { 1473 if (p != NULL) 1474 kref_put(&p->kref, nfs4_opendata_free); 1475 } 1476 1477 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1478 fmode_t fmode) 1479 { 1480 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1481 case FMODE_READ|FMODE_WRITE: 1482 return state->n_rdwr != 0; 1483 case FMODE_WRITE: 1484 return state->n_wronly != 0; 1485 case FMODE_READ: 1486 return state->n_rdonly != 0; 1487 } 1488 WARN_ON_ONCE(1); 1489 return false; 1490 } 1491 1492 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1493 int open_mode, enum open_claim_type4 claim) 1494 { 1495 int ret = 0; 1496 1497 if (open_mode & (O_EXCL|O_TRUNC)) 1498 goto out; 1499 switch (claim) { 1500 case NFS4_OPEN_CLAIM_NULL: 1501 case NFS4_OPEN_CLAIM_FH: 1502 goto out; 1503 default: 1504 break; 1505 } 1506 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1507 case FMODE_READ: 1508 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1509 && state->n_rdonly != 0; 1510 break; 1511 case FMODE_WRITE: 1512 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1513 && state->n_wronly != 0; 1514 break; 1515 case FMODE_READ|FMODE_WRITE: 1516 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1517 && state->n_rdwr != 0; 1518 } 1519 out: 1520 return ret; 1521 } 1522 1523 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1524 enum open_claim_type4 claim) 1525 { 1526 if (delegation == NULL) 1527 return 0; 1528 if ((delegation->type & fmode) != fmode) 1529 return 0; 1530 switch (claim) { 1531 case NFS4_OPEN_CLAIM_NULL: 1532 case NFS4_OPEN_CLAIM_FH: 1533 break; 1534 case NFS4_OPEN_CLAIM_PREVIOUS: 1535 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1536 break; 1537 fallthrough; 1538 default: 1539 return 0; 1540 } 1541 nfs_mark_delegation_referenced(delegation); 1542 return 1; 1543 } 1544 1545 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1546 { 1547 switch (fmode) { 1548 case FMODE_WRITE: 1549 state->n_wronly++; 1550 break; 1551 case FMODE_READ: 1552 state->n_rdonly++; 1553 break; 1554 case FMODE_READ|FMODE_WRITE: 1555 state->n_rdwr++; 1556 } 1557 nfs4_state_set_mode_locked(state, state->state | fmode); 1558 } 1559 1560 #ifdef CONFIG_NFS_V4_1 1561 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1562 { 1563 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1564 return true; 1565 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1566 return true; 1567 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1568 return true; 1569 return false; 1570 } 1571 #endif /* CONFIG_NFS_V4_1 */ 1572 1573 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1574 { 1575 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1576 wake_up_all(&state->waitq); 1577 } 1578 1579 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1580 { 1581 struct nfs_client *clp = state->owner->so_server->nfs_client; 1582 bool need_recover = false; 1583 1584 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1585 need_recover = true; 1586 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1587 need_recover = true; 1588 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1589 need_recover = true; 1590 if (need_recover) 1591 nfs4_state_mark_reclaim_nograce(clp, state); 1592 } 1593 1594 /* 1595 * Check for whether or not the caller may update the open stateid 1596 * to the value passed in by stateid. 1597 * 1598 * Note: This function relies heavily on the server implementing 1599 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1600 * correctly. 1601 * i.e. The stateid seqids have to be initialised to 1, and 1602 * are then incremented on every state transition. 1603 */ 1604 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1605 const nfs4_stateid *stateid) 1606 { 1607 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1608 /* The common case - we're updating to a new sequence number */ 1609 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1610 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1611 return true; 1612 return false; 1613 } 1614 /* The server returned a new stateid */ 1615 } 1616 /* This is the first OPEN in this generation */ 1617 if (stateid->seqid == cpu_to_be32(1)) 1618 return true; 1619 return false; 1620 } 1621 1622 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1623 { 1624 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1625 return; 1626 if (state->n_wronly) 1627 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1628 if (state->n_rdonly) 1629 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1630 if (state->n_rdwr) 1631 set_bit(NFS_O_RDWR_STATE, &state->flags); 1632 set_bit(NFS_OPEN_STATE, &state->flags); 1633 } 1634 1635 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1636 nfs4_stateid *stateid, fmode_t fmode) 1637 { 1638 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1639 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1640 case FMODE_WRITE: 1641 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1642 break; 1643 case FMODE_READ: 1644 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1645 break; 1646 case 0: 1647 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1648 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1649 clear_bit(NFS_OPEN_STATE, &state->flags); 1650 } 1651 if (stateid == NULL) 1652 return; 1653 /* Handle OPEN+OPEN_DOWNGRADE races */ 1654 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1655 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1656 nfs_resync_open_stateid_locked(state); 1657 goto out; 1658 } 1659 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1660 nfs4_stateid_copy(&state->stateid, stateid); 1661 nfs4_stateid_copy(&state->open_stateid, stateid); 1662 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1663 out: 1664 nfs_state_log_update_open_stateid(state); 1665 } 1666 1667 static void nfs_clear_open_stateid(struct nfs4_state *state, 1668 nfs4_stateid *arg_stateid, 1669 nfs4_stateid *stateid, fmode_t fmode) 1670 { 1671 write_seqlock(&state->seqlock); 1672 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1673 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1674 nfs_clear_open_stateid_locked(state, stateid, fmode); 1675 write_sequnlock(&state->seqlock); 1676 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1677 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1678 } 1679 1680 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1681 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1682 __must_hold(&state->owner->so_lock) 1683 __must_hold(&state->seqlock) 1684 __must_hold(RCU) 1685 1686 { 1687 DEFINE_WAIT(wait); 1688 int status = 0; 1689 for (;;) { 1690 1691 if (nfs_stateid_is_sequential(state, stateid)) 1692 break; 1693 1694 if (status) 1695 break; 1696 /* Rely on seqids for serialisation with NFSv4.0 */ 1697 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1698 break; 1699 1700 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1701 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1702 /* 1703 * Ensure we process the state changes in the same order 1704 * in which the server processed them by delaying the 1705 * update of the stateid until we are in sequence. 1706 */ 1707 write_sequnlock(&state->seqlock); 1708 spin_unlock(&state->owner->so_lock); 1709 rcu_read_unlock(); 1710 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1711 1712 if (!fatal_signal_pending(current)) { 1713 if (schedule_timeout(5*HZ) == 0) 1714 status = -EAGAIN; 1715 else 1716 status = 0; 1717 } else 1718 status = -EINTR; 1719 finish_wait(&state->waitq, &wait); 1720 rcu_read_lock(); 1721 spin_lock(&state->owner->so_lock); 1722 write_seqlock(&state->seqlock); 1723 } 1724 1725 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1726 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1727 nfs4_stateid_copy(freeme, &state->open_stateid); 1728 nfs_test_and_clear_all_open_stateid(state); 1729 } 1730 1731 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1732 nfs4_stateid_copy(&state->stateid, stateid); 1733 nfs4_stateid_copy(&state->open_stateid, stateid); 1734 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1735 nfs_state_log_update_open_stateid(state); 1736 } 1737 1738 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1739 const nfs4_stateid *open_stateid, 1740 fmode_t fmode, 1741 nfs4_stateid *freeme) 1742 { 1743 /* 1744 * Protect the call to nfs4_state_set_mode_locked and 1745 * serialise the stateid update 1746 */ 1747 write_seqlock(&state->seqlock); 1748 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1749 switch (fmode) { 1750 case FMODE_READ: 1751 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1752 break; 1753 case FMODE_WRITE: 1754 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1755 break; 1756 case FMODE_READ|FMODE_WRITE: 1757 set_bit(NFS_O_RDWR_STATE, &state->flags); 1758 } 1759 set_bit(NFS_OPEN_STATE, &state->flags); 1760 write_sequnlock(&state->seqlock); 1761 } 1762 1763 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1764 { 1765 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1766 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1767 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1768 clear_bit(NFS_OPEN_STATE, &state->flags); 1769 } 1770 1771 static void nfs_state_set_delegation(struct nfs4_state *state, 1772 const nfs4_stateid *deleg_stateid, 1773 fmode_t fmode) 1774 { 1775 /* 1776 * Protect the call to nfs4_state_set_mode_locked and 1777 * serialise the stateid update 1778 */ 1779 write_seqlock(&state->seqlock); 1780 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1781 set_bit(NFS_DELEGATED_STATE, &state->flags); 1782 write_sequnlock(&state->seqlock); 1783 } 1784 1785 static void nfs_state_clear_delegation(struct nfs4_state *state) 1786 { 1787 write_seqlock(&state->seqlock); 1788 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1789 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1790 write_sequnlock(&state->seqlock); 1791 } 1792 1793 int update_open_stateid(struct nfs4_state *state, 1794 const nfs4_stateid *open_stateid, 1795 const nfs4_stateid *delegation, 1796 fmode_t fmode) 1797 { 1798 struct nfs_server *server = NFS_SERVER(state->inode); 1799 struct nfs_client *clp = server->nfs_client; 1800 struct nfs_inode *nfsi = NFS_I(state->inode); 1801 struct nfs_delegation *deleg_cur; 1802 nfs4_stateid freeme = { }; 1803 int ret = 0; 1804 1805 fmode &= (FMODE_READ|FMODE_WRITE); 1806 1807 rcu_read_lock(); 1808 spin_lock(&state->owner->so_lock); 1809 if (open_stateid != NULL) { 1810 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1811 ret = 1; 1812 } 1813 1814 deleg_cur = nfs4_get_valid_delegation(state->inode); 1815 if (deleg_cur == NULL) 1816 goto no_delegation; 1817 1818 spin_lock(&deleg_cur->lock); 1819 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1820 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1821 (deleg_cur->type & fmode) != fmode) 1822 goto no_delegation_unlock; 1823 1824 if (delegation == NULL) 1825 delegation = &deleg_cur->stateid; 1826 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1827 goto no_delegation_unlock; 1828 1829 nfs_mark_delegation_referenced(deleg_cur); 1830 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1831 ret = 1; 1832 no_delegation_unlock: 1833 spin_unlock(&deleg_cur->lock); 1834 no_delegation: 1835 if (ret) 1836 update_open_stateflags(state, fmode); 1837 spin_unlock(&state->owner->so_lock); 1838 rcu_read_unlock(); 1839 1840 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1841 nfs4_schedule_state_manager(clp); 1842 if (freeme.type != 0) 1843 nfs4_test_and_free_stateid(server, &freeme, 1844 state->owner->so_cred); 1845 1846 return ret; 1847 } 1848 1849 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1850 const nfs4_stateid *stateid) 1851 { 1852 struct nfs4_state *state = lsp->ls_state; 1853 bool ret = false; 1854 1855 spin_lock(&state->state_lock); 1856 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1857 goto out_noupdate; 1858 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1859 goto out_noupdate; 1860 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1861 ret = true; 1862 out_noupdate: 1863 spin_unlock(&state->state_lock); 1864 return ret; 1865 } 1866 1867 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1868 { 1869 struct nfs_delegation *delegation; 1870 1871 fmode &= FMODE_READ|FMODE_WRITE; 1872 rcu_read_lock(); 1873 delegation = nfs4_get_valid_delegation(inode); 1874 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1875 rcu_read_unlock(); 1876 return; 1877 } 1878 rcu_read_unlock(); 1879 nfs4_inode_return_delegation(inode); 1880 } 1881 1882 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1883 { 1884 struct nfs4_state *state = opendata->state; 1885 struct nfs_delegation *delegation; 1886 int open_mode = opendata->o_arg.open_flags; 1887 fmode_t fmode = opendata->o_arg.fmode; 1888 enum open_claim_type4 claim = opendata->o_arg.claim; 1889 nfs4_stateid stateid; 1890 int ret = -EAGAIN; 1891 1892 for (;;) { 1893 spin_lock(&state->owner->so_lock); 1894 if (can_open_cached(state, fmode, open_mode, claim)) { 1895 update_open_stateflags(state, fmode); 1896 spin_unlock(&state->owner->so_lock); 1897 goto out_return_state; 1898 } 1899 spin_unlock(&state->owner->so_lock); 1900 rcu_read_lock(); 1901 delegation = nfs4_get_valid_delegation(state->inode); 1902 if (!can_open_delegated(delegation, fmode, claim)) { 1903 rcu_read_unlock(); 1904 break; 1905 } 1906 /* Save the delegation */ 1907 nfs4_stateid_copy(&stateid, &delegation->stateid); 1908 rcu_read_unlock(); 1909 nfs_release_seqid(opendata->o_arg.seqid); 1910 if (!opendata->is_recover) { 1911 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1912 if (ret != 0) 1913 goto out; 1914 } 1915 ret = -EAGAIN; 1916 1917 /* Try to update the stateid using the delegation */ 1918 if (update_open_stateid(state, NULL, &stateid, fmode)) 1919 goto out_return_state; 1920 } 1921 out: 1922 return ERR_PTR(ret); 1923 out_return_state: 1924 refcount_inc(&state->count); 1925 return state; 1926 } 1927 1928 static void 1929 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1930 { 1931 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1932 struct nfs_delegation *delegation; 1933 int delegation_flags = 0; 1934 1935 rcu_read_lock(); 1936 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1937 if (delegation) 1938 delegation_flags = delegation->flags; 1939 rcu_read_unlock(); 1940 switch (data->o_arg.claim) { 1941 default: 1942 break; 1943 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1944 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1945 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1946 "returning a delegation for " 1947 "OPEN(CLAIM_DELEGATE_CUR)\n", 1948 clp->cl_hostname); 1949 return; 1950 } 1951 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1952 nfs_inode_set_delegation(state->inode, 1953 data->owner->so_cred, 1954 data->o_res.delegation_type, 1955 &data->o_res.delegation, 1956 data->o_res.pagemod_limit); 1957 else 1958 nfs_inode_reclaim_delegation(state->inode, 1959 data->owner->so_cred, 1960 data->o_res.delegation_type, 1961 &data->o_res.delegation, 1962 data->o_res.pagemod_limit); 1963 1964 if (data->o_res.do_recall) 1965 nfs_async_inode_return_delegation(state->inode, 1966 &data->o_res.delegation); 1967 } 1968 1969 /* 1970 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1971 * and update the nfs4_state. 1972 */ 1973 static struct nfs4_state * 1974 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1975 { 1976 struct inode *inode = data->state->inode; 1977 struct nfs4_state *state = data->state; 1978 int ret; 1979 1980 if (!data->rpc_done) { 1981 if (data->rpc_status) 1982 return ERR_PTR(data->rpc_status); 1983 return nfs4_try_open_cached(data); 1984 } 1985 1986 ret = nfs_refresh_inode(inode, &data->f_attr); 1987 if (ret) 1988 return ERR_PTR(ret); 1989 1990 if (data->o_res.delegation_type != 0) 1991 nfs4_opendata_check_deleg(data, state); 1992 1993 if (!update_open_stateid(state, &data->o_res.stateid, 1994 NULL, data->o_arg.fmode)) 1995 return ERR_PTR(-EAGAIN); 1996 refcount_inc(&state->count); 1997 1998 return state; 1999 } 2000 2001 static struct inode * 2002 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2003 { 2004 struct inode *inode; 2005 2006 switch (data->o_arg.claim) { 2007 case NFS4_OPEN_CLAIM_NULL: 2008 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2009 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2010 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2011 return ERR_PTR(-EAGAIN); 2012 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2013 &data->f_attr); 2014 break; 2015 default: 2016 inode = d_inode(data->dentry); 2017 ihold(inode); 2018 nfs_refresh_inode(inode, &data->f_attr); 2019 } 2020 return inode; 2021 } 2022 2023 static struct nfs4_state * 2024 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2025 { 2026 struct nfs4_state *state; 2027 struct inode *inode; 2028 2029 inode = nfs4_opendata_get_inode(data); 2030 if (IS_ERR(inode)) 2031 return ERR_CAST(inode); 2032 if (data->state != NULL && data->state->inode == inode) { 2033 state = data->state; 2034 refcount_inc(&state->count); 2035 } else 2036 state = nfs4_get_open_state(inode, data->owner); 2037 iput(inode); 2038 if (state == NULL) 2039 state = ERR_PTR(-ENOMEM); 2040 return state; 2041 } 2042 2043 static struct nfs4_state * 2044 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2045 { 2046 struct nfs4_state *state; 2047 2048 if (!data->rpc_done) { 2049 state = nfs4_try_open_cached(data); 2050 trace_nfs4_cached_open(data->state); 2051 goto out; 2052 } 2053 2054 state = nfs4_opendata_find_nfs4_state(data); 2055 if (IS_ERR(state)) 2056 goto out; 2057 2058 if (data->o_res.delegation_type != 0) 2059 nfs4_opendata_check_deleg(data, state); 2060 if (!update_open_stateid(state, &data->o_res.stateid, 2061 NULL, data->o_arg.fmode)) { 2062 nfs4_put_open_state(state); 2063 state = ERR_PTR(-EAGAIN); 2064 } 2065 out: 2066 nfs_release_seqid(data->o_arg.seqid); 2067 return state; 2068 } 2069 2070 static struct nfs4_state * 2071 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2072 { 2073 struct nfs4_state *ret; 2074 2075 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2076 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2077 else 2078 ret = _nfs4_opendata_to_nfs4_state(data); 2079 nfs4_sequence_free_slot(&data->o_res.seq_res); 2080 return ret; 2081 } 2082 2083 static struct nfs_open_context * 2084 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2085 { 2086 struct nfs_inode *nfsi = NFS_I(state->inode); 2087 struct nfs_open_context *ctx; 2088 2089 rcu_read_lock(); 2090 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2091 if (ctx->state != state) 2092 continue; 2093 if ((ctx->mode & mode) != mode) 2094 continue; 2095 if (!get_nfs_open_context(ctx)) 2096 continue; 2097 rcu_read_unlock(); 2098 return ctx; 2099 } 2100 rcu_read_unlock(); 2101 return ERR_PTR(-ENOENT); 2102 } 2103 2104 static struct nfs_open_context * 2105 nfs4_state_find_open_context(struct nfs4_state *state) 2106 { 2107 struct nfs_open_context *ctx; 2108 2109 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2110 if (!IS_ERR(ctx)) 2111 return ctx; 2112 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2113 if (!IS_ERR(ctx)) 2114 return ctx; 2115 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2116 } 2117 2118 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2119 struct nfs4_state *state, enum open_claim_type4 claim) 2120 { 2121 struct nfs4_opendata *opendata; 2122 2123 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2124 NULL, claim, GFP_NOFS); 2125 if (opendata == NULL) 2126 return ERR_PTR(-ENOMEM); 2127 opendata->state = state; 2128 refcount_inc(&state->count); 2129 return opendata; 2130 } 2131 2132 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2133 fmode_t fmode) 2134 { 2135 struct nfs4_state *newstate; 2136 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2137 int openflags = opendata->o_arg.open_flags; 2138 int ret; 2139 2140 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2141 return 0; 2142 opendata->o_arg.fmode = fmode; 2143 opendata->o_arg.share_access = 2144 nfs4_map_atomic_open_share(server, fmode, openflags); 2145 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2146 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2147 nfs4_init_opendata_res(opendata); 2148 ret = _nfs4_recover_proc_open(opendata); 2149 if (ret != 0) 2150 return ret; 2151 newstate = nfs4_opendata_to_nfs4_state(opendata); 2152 if (IS_ERR(newstate)) 2153 return PTR_ERR(newstate); 2154 if (newstate != opendata->state) 2155 ret = -ESTALE; 2156 nfs4_close_state(newstate, fmode); 2157 return ret; 2158 } 2159 2160 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2161 { 2162 int ret; 2163 2164 /* memory barrier prior to reading state->n_* */ 2165 smp_rmb(); 2166 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2167 if (ret != 0) 2168 return ret; 2169 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2170 if (ret != 0) 2171 return ret; 2172 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2173 if (ret != 0) 2174 return ret; 2175 /* 2176 * We may have performed cached opens for all three recoveries. 2177 * Check if we need to update the current stateid. 2178 */ 2179 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2180 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2181 write_seqlock(&state->seqlock); 2182 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2183 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2184 write_sequnlock(&state->seqlock); 2185 } 2186 return 0; 2187 } 2188 2189 /* 2190 * OPEN_RECLAIM: 2191 * reclaim state on the server after a reboot. 2192 */ 2193 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2194 { 2195 struct nfs_delegation *delegation; 2196 struct nfs4_opendata *opendata; 2197 fmode_t delegation_type = 0; 2198 int status; 2199 2200 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2201 NFS4_OPEN_CLAIM_PREVIOUS); 2202 if (IS_ERR(opendata)) 2203 return PTR_ERR(opendata); 2204 rcu_read_lock(); 2205 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2206 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2207 delegation_type = delegation->type; 2208 rcu_read_unlock(); 2209 opendata->o_arg.u.delegation_type = delegation_type; 2210 status = nfs4_open_recover(opendata, state); 2211 nfs4_opendata_put(opendata); 2212 return status; 2213 } 2214 2215 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2216 { 2217 struct nfs_server *server = NFS_SERVER(state->inode); 2218 struct nfs4_exception exception = { }; 2219 int err; 2220 do { 2221 err = _nfs4_do_open_reclaim(ctx, state); 2222 trace_nfs4_open_reclaim(ctx, 0, err); 2223 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2224 continue; 2225 if (err != -NFS4ERR_DELAY) 2226 break; 2227 nfs4_handle_exception(server, err, &exception); 2228 } while (exception.retry); 2229 return err; 2230 } 2231 2232 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2233 { 2234 struct nfs_open_context *ctx; 2235 int ret; 2236 2237 ctx = nfs4_state_find_open_context(state); 2238 if (IS_ERR(ctx)) 2239 return -EAGAIN; 2240 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2241 nfs_state_clear_open_state_flags(state); 2242 ret = nfs4_do_open_reclaim(ctx, state); 2243 put_nfs_open_context(ctx); 2244 return ret; 2245 } 2246 2247 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err) 2248 { 2249 switch (err) { 2250 default: 2251 printk(KERN_ERR "NFS: %s: unhandled error " 2252 "%d.\n", __func__, err); 2253 fallthrough; 2254 case 0: 2255 case -ENOENT: 2256 case -EAGAIN: 2257 case -ESTALE: 2258 case -ETIMEDOUT: 2259 break; 2260 case -NFS4ERR_BADSESSION: 2261 case -NFS4ERR_BADSLOT: 2262 case -NFS4ERR_BAD_HIGH_SLOT: 2263 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2264 case -NFS4ERR_DEADSESSION: 2265 return -EAGAIN; 2266 case -NFS4ERR_STALE_CLIENTID: 2267 case -NFS4ERR_STALE_STATEID: 2268 /* Don't recall a delegation if it was lost */ 2269 nfs4_schedule_lease_recovery(server->nfs_client); 2270 return -EAGAIN; 2271 case -NFS4ERR_MOVED: 2272 nfs4_schedule_migration_recovery(server); 2273 return -EAGAIN; 2274 case -NFS4ERR_LEASE_MOVED: 2275 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2276 return -EAGAIN; 2277 case -NFS4ERR_DELEG_REVOKED: 2278 case -NFS4ERR_ADMIN_REVOKED: 2279 case -NFS4ERR_EXPIRED: 2280 case -NFS4ERR_BAD_STATEID: 2281 case -NFS4ERR_OPENMODE: 2282 nfs_inode_find_state_and_recover(state->inode, 2283 stateid); 2284 nfs4_schedule_stateid_recovery(server, state); 2285 return -EAGAIN; 2286 case -NFS4ERR_DELAY: 2287 case -NFS4ERR_GRACE: 2288 ssleep(1); 2289 return -EAGAIN; 2290 case -ENOMEM: 2291 case -NFS4ERR_DENIED: 2292 if (fl) { 2293 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2294 if (lsp) 2295 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2296 } 2297 return 0; 2298 } 2299 return err; 2300 } 2301 2302 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2303 struct nfs4_state *state, const nfs4_stateid *stateid) 2304 { 2305 struct nfs_server *server = NFS_SERVER(state->inode); 2306 struct nfs4_opendata *opendata; 2307 int err = 0; 2308 2309 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2310 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2311 if (IS_ERR(opendata)) 2312 return PTR_ERR(opendata); 2313 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2314 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2315 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2316 if (err) 2317 goto out; 2318 } 2319 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2320 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2321 if (err) 2322 goto out; 2323 } 2324 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2325 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2326 if (err) 2327 goto out; 2328 } 2329 nfs_state_clear_delegation(state); 2330 out: 2331 nfs4_opendata_put(opendata); 2332 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2333 } 2334 2335 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2336 { 2337 struct nfs4_opendata *data = calldata; 2338 2339 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2340 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2341 } 2342 2343 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2344 { 2345 struct nfs4_opendata *data = calldata; 2346 2347 nfs40_sequence_done(task, &data->c_res.seq_res); 2348 2349 data->rpc_status = task->tk_status; 2350 if (data->rpc_status == 0) { 2351 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2352 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2353 renew_lease(data->o_res.server, data->timestamp); 2354 data->rpc_done = true; 2355 } 2356 } 2357 2358 static void nfs4_open_confirm_release(void *calldata) 2359 { 2360 struct nfs4_opendata *data = calldata; 2361 struct nfs4_state *state = NULL; 2362 2363 /* If this request hasn't been cancelled, do nothing */ 2364 if (!data->cancelled) 2365 goto out_free; 2366 /* In case of error, no cleanup! */ 2367 if (!data->rpc_done) 2368 goto out_free; 2369 state = nfs4_opendata_to_nfs4_state(data); 2370 if (!IS_ERR(state)) 2371 nfs4_close_state(state, data->o_arg.fmode); 2372 out_free: 2373 nfs4_opendata_put(data); 2374 } 2375 2376 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2377 .rpc_call_prepare = nfs4_open_confirm_prepare, 2378 .rpc_call_done = nfs4_open_confirm_done, 2379 .rpc_release = nfs4_open_confirm_release, 2380 }; 2381 2382 /* 2383 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2384 */ 2385 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2386 { 2387 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2388 struct rpc_task *task; 2389 struct rpc_message msg = { 2390 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2391 .rpc_argp = &data->c_arg, 2392 .rpc_resp = &data->c_res, 2393 .rpc_cred = data->owner->so_cred, 2394 }; 2395 struct rpc_task_setup task_setup_data = { 2396 .rpc_client = server->client, 2397 .rpc_message = &msg, 2398 .callback_ops = &nfs4_open_confirm_ops, 2399 .callback_data = data, 2400 .workqueue = nfsiod_workqueue, 2401 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2402 }; 2403 int status; 2404 2405 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2406 data->is_recover); 2407 kref_get(&data->kref); 2408 data->rpc_done = false; 2409 data->rpc_status = 0; 2410 data->timestamp = jiffies; 2411 task = rpc_run_task(&task_setup_data); 2412 if (IS_ERR(task)) 2413 return PTR_ERR(task); 2414 status = rpc_wait_for_completion_task(task); 2415 if (status != 0) { 2416 data->cancelled = true; 2417 smp_wmb(); 2418 } else 2419 status = data->rpc_status; 2420 rpc_put_task(task); 2421 return status; 2422 } 2423 2424 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2425 { 2426 struct nfs4_opendata *data = calldata; 2427 struct nfs4_state_owner *sp = data->owner; 2428 struct nfs_client *clp = sp->so_server->nfs_client; 2429 enum open_claim_type4 claim = data->o_arg.claim; 2430 2431 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2432 goto out_wait; 2433 /* 2434 * Check if we still need to send an OPEN call, or if we can use 2435 * a delegation instead. 2436 */ 2437 if (data->state != NULL) { 2438 struct nfs_delegation *delegation; 2439 2440 if (can_open_cached(data->state, data->o_arg.fmode, 2441 data->o_arg.open_flags, claim)) 2442 goto out_no_action; 2443 rcu_read_lock(); 2444 delegation = nfs4_get_valid_delegation(data->state->inode); 2445 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2446 goto unlock_no_action; 2447 rcu_read_unlock(); 2448 } 2449 /* Update client id. */ 2450 data->o_arg.clientid = clp->cl_clientid; 2451 switch (claim) { 2452 default: 2453 break; 2454 case NFS4_OPEN_CLAIM_PREVIOUS: 2455 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2456 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2457 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2458 fallthrough; 2459 case NFS4_OPEN_CLAIM_FH: 2460 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2461 } 2462 data->timestamp = jiffies; 2463 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2464 &data->o_arg.seq_args, 2465 &data->o_res.seq_res, 2466 task) != 0) 2467 nfs_release_seqid(data->o_arg.seqid); 2468 2469 /* Set the create mode (note dependency on the session type) */ 2470 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2471 if (data->o_arg.open_flags & O_EXCL) { 2472 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2473 if (clp->cl_mvops->minor_version == 0) { 2474 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2475 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2476 * because ACCESS will return permission denied for 2477 * all bits until close */ 2478 data->o_res.access_request = data->o_arg.access = 0; 2479 } else if (nfs4_has_persistent_session(clp)) 2480 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2481 } 2482 return; 2483 unlock_no_action: 2484 trace_nfs4_cached_open(data->state); 2485 rcu_read_unlock(); 2486 out_no_action: 2487 task->tk_action = NULL; 2488 out_wait: 2489 nfs4_sequence_done(task, &data->o_res.seq_res); 2490 } 2491 2492 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2493 { 2494 struct nfs4_opendata *data = calldata; 2495 2496 data->rpc_status = task->tk_status; 2497 2498 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2499 return; 2500 2501 if (task->tk_status == 0) { 2502 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2503 switch (data->o_res.f_attr->mode & S_IFMT) { 2504 case S_IFREG: 2505 break; 2506 case S_IFLNK: 2507 data->rpc_status = -ELOOP; 2508 break; 2509 case S_IFDIR: 2510 data->rpc_status = -EISDIR; 2511 break; 2512 default: 2513 data->rpc_status = -ENOTDIR; 2514 } 2515 } 2516 renew_lease(data->o_res.server, data->timestamp); 2517 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2518 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2519 } 2520 data->rpc_done = true; 2521 } 2522 2523 static void nfs4_open_release(void *calldata) 2524 { 2525 struct nfs4_opendata *data = calldata; 2526 struct nfs4_state *state = NULL; 2527 2528 /* If this request hasn't been cancelled, do nothing */ 2529 if (!data->cancelled) 2530 goto out_free; 2531 /* In case of error, no cleanup! */ 2532 if (data->rpc_status != 0 || !data->rpc_done) 2533 goto out_free; 2534 /* In case we need an open_confirm, no cleanup! */ 2535 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2536 goto out_free; 2537 state = nfs4_opendata_to_nfs4_state(data); 2538 if (!IS_ERR(state)) 2539 nfs4_close_state(state, data->o_arg.fmode); 2540 out_free: 2541 nfs4_opendata_put(data); 2542 } 2543 2544 static const struct rpc_call_ops nfs4_open_ops = { 2545 .rpc_call_prepare = nfs4_open_prepare, 2546 .rpc_call_done = nfs4_open_done, 2547 .rpc_release = nfs4_open_release, 2548 }; 2549 2550 static int nfs4_run_open_task(struct nfs4_opendata *data, 2551 struct nfs_open_context *ctx) 2552 { 2553 struct inode *dir = d_inode(data->dir); 2554 struct nfs_server *server = NFS_SERVER(dir); 2555 struct nfs_openargs *o_arg = &data->o_arg; 2556 struct nfs_openres *o_res = &data->o_res; 2557 struct rpc_task *task; 2558 struct rpc_message msg = { 2559 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2560 .rpc_argp = o_arg, 2561 .rpc_resp = o_res, 2562 .rpc_cred = data->owner->so_cred, 2563 }; 2564 struct rpc_task_setup task_setup_data = { 2565 .rpc_client = server->client, 2566 .rpc_message = &msg, 2567 .callback_ops = &nfs4_open_ops, 2568 .callback_data = data, 2569 .workqueue = nfsiod_workqueue, 2570 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2571 }; 2572 int status; 2573 2574 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2575 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2576 2577 kref_get(&data->kref); 2578 data->rpc_done = false; 2579 data->rpc_status = 0; 2580 data->cancelled = false; 2581 data->is_recover = false; 2582 if (!ctx) { 2583 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2584 data->is_recover = true; 2585 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2586 } else { 2587 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2588 pnfs_lgopen_prepare(data, ctx); 2589 } 2590 task = rpc_run_task(&task_setup_data); 2591 if (IS_ERR(task)) 2592 return PTR_ERR(task); 2593 status = rpc_wait_for_completion_task(task); 2594 if (status != 0) { 2595 data->cancelled = true; 2596 smp_wmb(); 2597 } else 2598 status = data->rpc_status; 2599 rpc_put_task(task); 2600 2601 return status; 2602 } 2603 2604 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2605 { 2606 struct inode *dir = d_inode(data->dir); 2607 struct nfs_openres *o_res = &data->o_res; 2608 int status; 2609 2610 status = nfs4_run_open_task(data, NULL); 2611 if (status != 0 || !data->rpc_done) 2612 return status; 2613 2614 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2615 2616 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2617 status = _nfs4_proc_open_confirm(data); 2618 2619 return status; 2620 } 2621 2622 /* 2623 * Additional permission checks in order to distinguish between an 2624 * open for read, and an open for execute. This works around the 2625 * fact that NFSv4 OPEN treats read and execute permissions as being 2626 * the same. 2627 * Note that in the non-execute case, we want to turn off permission 2628 * checking if we just created a new file (POSIX open() semantics). 2629 */ 2630 static int nfs4_opendata_access(const struct cred *cred, 2631 struct nfs4_opendata *opendata, 2632 struct nfs4_state *state, fmode_t fmode) 2633 { 2634 struct nfs_access_entry cache; 2635 u32 mask, flags; 2636 2637 /* access call failed or for some reason the server doesn't 2638 * support any access modes -- defer access call until later */ 2639 if (opendata->o_res.access_supported == 0) 2640 return 0; 2641 2642 mask = 0; 2643 if (fmode & FMODE_EXEC) { 2644 /* ONLY check for exec rights */ 2645 if (S_ISDIR(state->inode->i_mode)) 2646 mask = NFS4_ACCESS_LOOKUP; 2647 else 2648 mask = NFS4_ACCESS_EXECUTE; 2649 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2650 mask = NFS4_ACCESS_READ; 2651 2652 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2653 nfs_access_add_cache(state->inode, &cache, cred); 2654 2655 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2656 if ((mask & ~cache.mask & flags) == 0) 2657 return 0; 2658 2659 return -EACCES; 2660 } 2661 2662 /* 2663 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2664 */ 2665 static int _nfs4_proc_open(struct nfs4_opendata *data, 2666 struct nfs_open_context *ctx) 2667 { 2668 struct inode *dir = d_inode(data->dir); 2669 struct nfs_server *server = NFS_SERVER(dir); 2670 struct nfs_openargs *o_arg = &data->o_arg; 2671 struct nfs_openres *o_res = &data->o_res; 2672 int status; 2673 2674 status = nfs4_run_open_task(data, ctx); 2675 if (!data->rpc_done) 2676 return status; 2677 if (status != 0) { 2678 if (status == -NFS4ERR_BADNAME && 2679 !(o_arg->open_flags & O_CREAT)) 2680 return -ENOENT; 2681 return status; 2682 } 2683 2684 nfs_fattr_map_and_free_names(server, &data->f_attr); 2685 2686 if (o_arg->open_flags & O_CREAT) { 2687 if (o_arg->open_flags & O_EXCL) 2688 data->file_created = true; 2689 else if (o_res->cinfo.before != o_res->cinfo.after) 2690 data->file_created = true; 2691 if (data->file_created || 2692 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2693 nfs4_update_changeattr(dir, &o_res->cinfo, 2694 o_res->f_attr->time_start, 2695 NFS_INO_INVALID_DATA); 2696 } 2697 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2698 server->caps &= ~NFS_CAP_POSIX_LOCK; 2699 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2700 status = _nfs4_proc_open_confirm(data); 2701 if (status != 0) 2702 return status; 2703 } 2704 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2705 nfs4_sequence_free_slot(&o_res->seq_res); 2706 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL); 2707 } 2708 return 0; 2709 } 2710 2711 /* 2712 * OPEN_EXPIRED: 2713 * reclaim state on the server after a network partition. 2714 * Assumes caller holds the appropriate lock 2715 */ 2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2717 { 2718 struct nfs4_opendata *opendata; 2719 int ret; 2720 2721 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2722 if (IS_ERR(opendata)) 2723 return PTR_ERR(opendata); 2724 /* 2725 * We're not recovering a delegation, so ask for no delegation. 2726 * Otherwise the recovery thread could deadlock with an outstanding 2727 * delegation return. 2728 */ 2729 opendata->o_arg.open_flags = O_DIRECT; 2730 ret = nfs4_open_recover(opendata, state); 2731 if (ret == -ESTALE) 2732 d_drop(ctx->dentry); 2733 nfs4_opendata_put(opendata); 2734 return ret; 2735 } 2736 2737 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2738 { 2739 struct nfs_server *server = NFS_SERVER(state->inode); 2740 struct nfs4_exception exception = { }; 2741 int err; 2742 2743 do { 2744 err = _nfs4_open_expired(ctx, state); 2745 trace_nfs4_open_expired(ctx, 0, err); 2746 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2747 continue; 2748 switch (err) { 2749 default: 2750 goto out; 2751 case -NFS4ERR_GRACE: 2752 case -NFS4ERR_DELAY: 2753 nfs4_handle_exception(server, err, &exception); 2754 err = 0; 2755 } 2756 } while (exception.retry); 2757 out: 2758 return err; 2759 } 2760 2761 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2762 { 2763 struct nfs_open_context *ctx; 2764 int ret; 2765 2766 ctx = nfs4_state_find_open_context(state); 2767 if (IS_ERR(ctx)) 2768 return -EAGAIN; 2769 ret = nfs4_do_open_expired(ctx, state); 2770 put_nfs_open_context(ctx); 2771 return ret; 2772 } 2773 2774 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2775 const nfs4_stateid *stateid) 2776 { 2777 nfs_remove_bad_delegation(state->inode, stateid); 2778 nfs_state_clear_delegation(state); 2779 } 2780 2781 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2782 { 2783 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2784 nfs_finish_clear_delegation_stateid(state, NULL); 2785 } 2786 2787 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2788 { 2789 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2790 nfs40_clear_delegation_stateid(state); 2791 nfs_state_clear_open_state_flags(state); 2792 return nfs4_open_expired(sp, state); 2793 } 2794 2795 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2796 nfs4_stateid *stateid, 2797 const struct cred *cred) 2798 { 2799 return -NFS4ERR_BAD_STATEID; 2800 } 2801 2802 #if defined(CONFIG_NFS_V4_1) 2803 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2804 nfs4_stateid *stateid, 2805 const struct cred *cred) 2806 { 2807 int status; 2808 2809 switch (stateid->type) { 2810 default: 2811 break; 2812 case NFS4_INVALID_STATEID_TYPE: 2813 case NFS4_SPECIAL_STATEID_TYPE: 2814 return -NFS4ERR_BAD_STATEID; 2815 case NFS4_REVOKED_STATEID_TYPE: 2816 goto out_free; 2817 } 2818 2819 status = nfs41_test_stateid(server, stateid, cred); 2820 switch (status) { 2821 case -NFS4ERR_EXPIRED: 2822 case -NFS4ERR_ADMIN_REVOKED: 2823 case -NFS4ERR_DELEG_REVOKED: 2824 break; 2825 default: 2826 return status; 2827 } 2828 out_free: 2829 /* Ack the revoked state to the server */ 2830 nfs41_free_stateid(server, stateid, cred, true); 2831 return -NFS4ERR_EXPIRED; 2832 } 2833 2834 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2835 { 2836 struct nfs_server *server = NFS_SERVER(state->inode); 2837 nfs4_stateid stateid; 2838 struct nfs_delegation *delegation; 2839 const struct cred *cred = NULL; 2840 int status, ret = NFS_OK; 2841 2842 /* Get the delegation credential for use by test/free_stateid */ 2843 rcu_read_lock(); 2844 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2845 if (delegation == NULL) { 2846 rcu_read_unlock(); 2847 nfs_state_clear_delegation(state); 2848 return NFS_OK; 2849 } 2850 2851 spin_lock(&delegation->lock); 2852 nfs4_stateid_copy(&stateid, &delegation->stateid); 2853 2854 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2855 &delegation->flags)) { 2856 spin_unlock(&delegation->lock); 2857 rcu_read_unlock(); 2858 return NFS_OK; 2859 } 2860 2861 if (delegation->cred) 2862 cred = get_cred(delegation->cred); 2863 spin_unlock(&delegation->lock); 2864 rcu_read_unlock(); 2865 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2866 trace_nfs4_test_delegation_stateid(state, NULL, status); 2867 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2868 nfs_finish_clear_delegation_stateid(state, &stateid); 2869 else 2870 ret = status; 2871 2872 put_cred(cred); 2873 return ret; 2874 } 2875 2876 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2877 { 2878 nfs4_stateid tmp; 2879 2880 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2881 nfs4_copy_delegation_stateid(state->inode, state->state, 2882 &tmp, NULL) && 2883 nfs4_stateid_match_other(&state->stateid, &tmp)) 2884 nfs_state_set_delegation(state, &tmp, state->state); 2885 else 2886 nfs_state_clear_delegation(state); 2887 } 2888 2889 /** 2890 * nfs41_check_expired_locks - possibly free a lock stateid 2891 * 2892 * @state: NFSv4 state for an inode 2893 * 2894 * Returns NFS_OK if recovery for this stateid is now finished. 2895 * Otherwise a negative NFS4ERR value is returned. 2896 */ 2897 static int nfs41_check_expired_locks(struct nfs4_state *state) 2898 { 2899 int status, ret = NFS_OK; 2900 struct nfs4_lock_state *lsp, *prev = NULL; 2901 struct nfs_server *server = NFS_SERVER(state->inode); 2902 2903 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2904 goto out; 2905 2906 spin_lock(&state->state_lock); 2907 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2908 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2909 const struct cred *cred = lsp->ls_state->owner->so_cred; 2910 2911 refcount_inc(&lsp->ls_count); 2912 spin_unlock(&state->state_lock); 2913 2914 nfs4_put_lock_state(prev); 2915 prev = lsp; 2916 2917 status = nfs41_test_and_free_expired_stateid(server, 2918 &lsp->ls_stateid, 2919 cred); 2920 trace_nfs4_test_lock_stateid(state, lsp, status); 2921 if (status == -NFS4ERR_EXPIRED || 2922 status == -NFS4ERR_BAD_STATEID) { 2923 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2924 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2925 if (!recover_lost_locks) 2926 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2927 } else if (status != NFS_OK) { 2928 ret = status; 2929 nfs4_put_lock_state(prev); 2930 goto out; 2931 } 2932 spin_lock(&state->state_lock); 2933 } 2934 } 2935 spin_unlock(&state->state_lock); 2936 nfs4_put_lock_state(prev); 2937 out: 2938 return ret; 2939 } 2940 2941 /** 2942 * nfs41_check_open_stateid - possibly free an open stateid 2943 * 2944 * @state: NFSv4 state for an inode 2945 * 2946 * Returns NFS_OK if recovery for this stateid is now finished. 2947 * Otherwise a negative NFS4ERR value is returned. 2948 */ 2949 static int nfs41_check_open_stateid(struct nfs4_state *state) 2950 { 2951 struct nfs_server *server = NFS_SERVER(state->inode); 2952 nfs4_stateid *stateid = &state->open_stateid; 2953 const struct cred *cred = state->owner->so_cred; 2954 int status; 2955 2956 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2957 return -NFS4ERR_BAD_STATEID; 2958 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2959 trace_nfs4_test_open_stateid(state, NULL, status); 2960 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2961 nfs_state_clear_open_state_flags(state); 2962 stateid->type = NFS4_INVALID_STATEID_TYPE; 2963 return status; 2964 } 2965 if (nfs_open_stateid_recover_openmode(state)) 2966 return -NFS4ERR_OPENMODE; 2967 return NFS_OK; 2968 } 2969 2970 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2971 { 2972 int status; 2973 2974 status = nfs41_check_delegation_stateid(state); 2975 if (status != NFS_OK) 2976 return status; 2977 nfs41_delegation_recover_stateid(state); 2978 2979 status = nfs41_check_expired_locks(state); 2980 if (status != NFS_OK) 2981 return status; 2982 status = nfs41_check_open_stateid(state); 2983 if (status != NFS_OK) 2984 status = nfs4_open_expired(sp, state); 2985 return status; 2986 } 2987 #endif 2988 2989 /* 2990 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2991 * fields corresponding to attributes that were used to store the verifier. 2992 * Make sure we clobber those fields in the later setattr call 2993 */ 2994 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2995 struct iattr *sattr, struct nfs4_label **label) 2996 { 2997 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2998 __u32 attrset[3]; 2999 unsigned ret; 3000 unsigned i; 3001 3002 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3003 attrset[i] = opendata->o_res.attrset[i]; 3004 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3005 attrset[i] &= ~bitmask[i]; 3006 } 3007 3008 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3009 sattr->ia_valid : 0; 3010 3011 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3012 if (sattr->ia_valid & ATTR_ATIME_SET) 3013 ret |= ATTR_ATIME_SET; 3014 else 3015 ret |= ATTR_ATIME; 3016 } 3017 3018 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3019 if (sattr->ia_valid & ATTR_MTIME_SET) 3020 ret |= ATTR_MTIME_SET; 3021 else 3022 ret |= ATTR_MTIME; 3023 } 3024 3025 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3026 *label = NULL; 3027 return ret; 3028 } 3029 3030 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3031 struct nfs_open_context *ctx) 3032 { 3033 struct nfs4_state_owner *sp = opendata->owner; 3034 struct nfs_server *server = sp->so_server; 3035 struct dentry *dentry; 3036 struct nfs4_state *state; 3037 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3038 struct inode *dir = d_inode(opendata->dir); 3039 unsigned long dir_verifier; 3040 unsigned int seq; 3041 int ret; 3042 3043 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3044 dir_verifier = nfs_save_change_attribute(dir); 3045 3046 ret = _nfs4_proc_open(opendata, ctx); 3047 if (ret != 0) 3048 goto out; 3049 3050 state = _nfs4_opendata_to_nfs4_state(opendata); 3051 ret = PTR_ERR(state); 3052 if (IS_ERR(state)) 3053 goto out; 3054 ctx->state = state; 3055 if (server->caps & NFS_CAP_POSIX_LOCK) 3056 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3057 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3058 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3059 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3060 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3061 3062 dentry = opendata->dentry; 3063 if (d_really_is_negative(dentry)) { 3064 struct dentry *alias; 3065 d_drop(dentry); 3066 alias = d_exact_alias(dentry, state->inode); 3067 if (!alias) 3068 alias = d_splice_alias(igrab(state->inode), dentry); 3069 /* d_splice_alias() can't fail here - it's a non-directory */ 3070 if (alias) { 3071 dput(ctx->dentry); 3072 ctx->dentry = dentry = alias; 3073 } 3074 } 3075 3076 switch(opendata->o_arg.claim) { 3077 default: 3078 break; 3079 case NFS4_OPEN_CLAIM_NULL: 3080 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3081 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3082 if (!opendata->rpc_done) 3083 break; 3084 if (opendata->o_res.delegation_type != 0) 3085 dir_verifier = nfs_save_change_attribute(dir); 3086 nfs_set_verifier(dentry, dir_verifier); 3087 } 3088 3089 /* Parse layoutget results before we check for access */ 3090 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3091 3092 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3093 if (ret != 0) 3094 goto out; 3095 3096 if (d_inode(dentry) == state->inode) { 3097 nfs_inode_attach_open_context(ctx); 3098 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3099 nfs4_schedule_stateid_recovery(server, state); 3100 } 3101 3102 out: 3103 if (!opendata->cancelled) { 3104 if (opendata->lgp) { 3105 nfs4_lgopen_release(opendata->lgp); 3106 opendata->lgp = NULL; 3107 } 3108 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3109 } 3110 return ret; 3111 } 3112 3113 /* 3114 * Returns a referenced nfs4_state 3115 */ 3116 static int _nfs4_do_open(struct inode *dir, 3117 struct nfs_open_context *ctx, 3118 int flags, 3119 const struct nfs4_open_createattrs *c, 3120 int *opened) 3121 { 3122 struct nfs4_state_owner *sp; 3123 struct nfs4_state *state = NULL; 3124 struct nfs_server *server = NFS_SERVER(dir); 3125 struct nfs4_opendata *opendata; 3126 struct dentry *dentry = ctx->dentry; 3127 const struct cred *cred = ctx->cred; 3128 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3129 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3130 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3131 struct iattr *sattr = c->sattr; 3132 struct nfs4_label *label = c->label; 3133 int status; 3134 3135 /* Protect against reboot recovery conflicts */ 3136 status = -ENOMEM; 3137 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3138 if (sp == NULL) { 3139 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3140 goto out_err; 3141 } 3142 status = nfs4_client_recover_expired_lease(server->nfs_client); 3143 if (status != 0) 3144 goto err_put_state_owner; 3145 if (d_really_is_positive(dentry)) 3146 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3147 status = -ENOMEM; 3148 if (d_really_is_positive(dentry)) 3149 claim = NFS4_OPEN_CLAIM_FH; 3150 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3151 c, claim, GFP_KERNEL); 3152 if (opendata == NULL) 3153 goto err_put_state_owner; 3154 3155 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3156 if (!opendata->f_attr.mdsthreshold) { 3157 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3158 if (!opendata->f_attr.mdsthreshold) 3159 goto err_opendata_put; 3160 } 3161 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3162 } 3163 if (d_really_is_positive(dentry)) 3164 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3165 3166 status = _nfs4_open_and_get_state(opendata, ctx); 3167 if (status != 0) 3168 goto err_opendata_put; 3169 state = ctx->state; 3170 3171 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3172 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3173 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3174 /* 3175 * send create attributes which was not set by open 3176 * with an extra setattr. 3177 */ 3178 if (attrs || label) { 3179 unsigned ia_old = sattr->ia_valid; 3180 3181 sattr->ia_valid = attrs; 3182 nfs_fattr_init(opendata->o_res.f_attr); 3183 status = nfs4_do_setattr(state->inode, cred, 3184 opendata->o_res.f_attr, sattr, 3185 ctx, label); 3186 if (status == 0) { 3187 nfs_setattr_update_inode(state->inode, sattr, 3188 opendata->o_res.f_attr); 3189 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3190 } 3191 sattr->ia_valid = ia_old; 3192 } 3193 } 3194 if (opened && opendata->file_created) 3195 *opened = 1; 3196 3197 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3198 *ctx_th = opendata->f_attr.mdsthreshold; 3199 opendata->f_attr.mdsthreshold = NULL; 3200 } 3201 3202 nfs4_opendata_put(opendata); 3203 nfs4_put_state_owner(sp); 3204 return 0; 3205 err_opendata_put: 3206 nfs4_opendata_put(opendata); 3207 err_put_state_owner: 3208 nfs4_put_state_owner(sp); 3209 out_err: 3210 return status; 3211 } 3212 3213 3214 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3215 struct nfs_open_context *ctx, 3216 int flags, 3217 struct iattr *sattr, 3218 struct nfs4_label *label, 3219 int *opened) 3220 { 3221 struct nfs_server *server = NFS_SERVER(dir); 3222 struct nfs4_exception exception = { 3223 .interruptible = true, 3224 }; 3225 struct nfs4_state *res; 3226 struct nfs4_open_createattrs c = { 3227 .label = label, 3228 .sattr = sattr, 3229 .verf = { 3230 [0] = (__u32)jiffies, 3231 [1] = (__u32)current->pid, 3232 }, 3233 }; 3234 int status; 3235 3236 do { 3237 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3238 res = ctx->state; 3239 trace_nfs4_open_file(ctx, flags, status); 3240 if (status == 0) 3241 break; 3242 /* NOTE: BAD_SEQID means the server and client disagree about the 3243 * book-keeping w.r.t. state-changing operations 3244 * (OPEN/CLOSE/LOCK/LOCKU...) 3245 * It is actually a sign of a bug on the client or on the server. 3246 * 3247 * If we receive a BAD_SEQID error in the particular case of 3248 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3249 * have unhashed the old state_owner for us, and that we can 3250 * therefore safely retry using a new one. We should still warn 3251 * the user though... 3252 */ 3253 if (status == -NFS4ERR_BAD_SEQID) { 3254 pr_warn_ratelimited("NFS: v4 server %s " 3255 " returned a bad sequence-id error!\n", 3256 NFS_SERVER(dir)->nfs_client->cl_hostname); 3257 exception.retry = 1; 3258 continue; 3259 } 3260 /* 3261 * BAD_STATEID on OPEN means that the server cancelled our 3262 * state before it received the OPEN_CONFIRM. 3263 * Recover by retrying the request as per the discussion 3264 * on Page 181 of RFC3530. 3265 */ 3266 if (status == -NFS4ERR_BAD_STATEID) { 3267 exception.retry = 1; 3268 continue; 3269 } 3270 if (status == -NFS4ERR_EXPIRED) { 3271 nfs4_schedule_lease_recovery(server->nfs_client); 3272 exception.retry = 1; 3273 continue; 3274 } 3275 if (status == -EAGAIN) { 3276 /* We must have found a delegation */ 3277 exception.retry = 1; 3278 continue; 3279 } 3280 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3281 continue; 3282 res = ERR_PTR(nfs4_handle_exception(server, 3283 status, &exception)); 3284 } while (exception.retry); 3285 return res; 3286 } 3287 3288 static int _nfs4_do_setattr(struct inode *inode, 3289 struct nfs_setattrargs *arg, 3290 struct nfs_setattrres *res, 3291 const struct cred *cred, 3292 struct nfs_open_context *ctx) 3293 { 3294 struct nfs_server *server = NFS_SERVER(inode); 3295 struct rpc_message msg = { 3296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3297 .rpc_argp = arg, 3298 .rpc_resp = res, 3299 .rpc_cred = cred, 3300 }; 3301 const struct cred *delegation_cred = NULL; 3302 unsigned long timestamp = jiffies; 3303 bool truncate; 3304 int status; 3305 3306 nfs_fattr_init(res->fattr); 3307 3308 /* Servers should only apply open mode checks for file size changes */ 3309 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3310 if (!truncate) { 3311 nfs4_inode_make_writeable(inode); 3312 goto zero_stateid; 3313 } 3314 3315 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3316 /* Use that stateid */ 3317 } else if (ctx != NULL && ctx->state) { 3318 struct nfs_lock_context *l_ctx; 3319 if (!nfs4_valid_open_stateid(ctx->state)) 3320 return -EBADF; 3321 l_ctx = nfs_get_lock_context(ctx); 3322 if (IS_ERR(l_ctx)) 3323 return PTR_ERR(l_ctx); 3324 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3325 &arg->stateid, &delegation_cred); 3326 nfs_put_lock_context(l_ctx); 3327 if (status == -EIO) 3328 return -EBADF; 3329 else if (status == -EAGAIN) 3330 goto zero_stateid; 3331 } else { 3332 zero_stateid: 3333 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3334 } 3335 if (delegation_cred) 3336 msg.rpc_cred = delegation_cred; 3337 3338 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3339 3340 put_cred(delegation_cred); 3341 if (status == 0 && ctx != NULL) 3342 renew_lease(server, timestamp); 3343 trace_nfs4_setattr(inode, &arg->stateid, status); 3344 return status; 3345 } 3346 3347 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3348 struct nfs_fattr *fattr, struct iattr *sattr, 3349 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3350 { 3351 struct nfs_server *server = NFS_SERVER(inode); 3352 __u32 bitmask[NFS4_BITMASK_SZ]; 3353 struct nfs4_state *state = ctx ? ctx->state : NULL; 3354 struct nfs_setattrargs arg = { 3355 .fh = NFS_FH(inode), 3356 .iap = sattr, 3357 .server = server, 3358 .bitmask = bitmask, 3359 .label = ilabel, 3360 }; 3361 struct nfs_setattrres res = { 3362 .fattr = fattr, 3363 .server = server, 3364 }; 3365 struct nfs4_exception exception = { 3366 .state = state, 3367 .inode = inode, 3368 .stateid = &arg.stateid, 3369 }; 3370 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3371 int err; 3372 3373 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3374 adjust_flags |= NFS_INO_INVALID_MODE; 3375 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3376 adjust_flags |= NFS_INO_INVALID_OTHER; 3377 3378 do { 3379 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3380 inode, adjust_flags); 3381 3382 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3383 switch (err) { 3384 case -NFS4ERR_OPENMODE: 3385 if (!(sattr->ia_valid & ATTR_SIZE)) { 3386 pr_warn_once("NFSv4: server %s is incorrectly " 3387 "applying open mode checks to " 3388 "a SETATTR that is not " 3389 "changing file size.\n", 3390 server->nfs_client->cl_hostname); 3391 } 3392 if (state && !(state->state & FMODE_WRITE)) { 3393 err = -EBADF; 3394 if (sattr->ia_valid & ATTR_OPEN) 3395 err = -EACCES; 3396 goto out; 3397 } 3398 } 3399 err = nfs4_handle_exception(server, err, &exception); 3400 } while (exception.retry); 3401 out: 3402 return err; 3403 } 3404 3405 static bool 3406 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3407 { 3408 if (inode == NULL || !nfs_have_layout(inode)) 3409 return false; 3410 3411 return pnfs_wait_on_layoutreturn(inode, task); 3412 } 3413 3414 /* 3415 * Update the seqid of an open stateid 3416 */ 3417 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3418 struct nfs4_state *state) 3419 { 3420 __be32 seqid_open; 3421 u32 dst_seqid; 3422 int seq; 3423 3424 for (;;) { 3425 if (!nfs4_valid_open_stateid(state)) 3426 break; 3427 seq = read_seqbegin(&state->seqlock); 3428 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3429 nfs4_stateid_copy(dst, &state->open_stateid); 3430 if (read_seqretry(&state->seqlock, seq)) 3431 continue; 3432 break; 3433 } 3434 seqid_open = state->open_stateid.seqid; 3435 if (read_seqretry(&state->seqlock, seq)) 3436 continue; 3437 3438 dst_seqid = be32_to_cpu(dst->seqid); 3439 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3440 dst->seqid = seqid_open; 3441 break; 3442 } 3443 } 3444 3445 /* 3446 * Update the seqid of an open stateid after receiving 3447 * NFS4ERR_OLD_STATEID 3448 */ 3449 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3450 struct nfs4_state *state) 3451 { 3452 __be32 seqid_open; 3453 u32 dst_seqid; 3454 bool ret; 3455 int seq, status = -EAGAIN; 3456 DEFINE_WAIT(wait); 3457 3458 for (;;) { 3459 ret = false; 3460 if (!nfs4_valid_open_stateid(state)) 3461 break; 3462 seq = read_seqbegin(&state->seqlock); 3463 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3464 if (read_seqretry(&state->seqlock, seq)) 3465 continue; 3466 break; 3467 } 3468 3469 write_seqlock(&state->seqlock); 3470 seqid_open = state->open_stateid.seqid; 3471 3472 dst_seqid = be32_to_cpu(dst->seqid); 3473 3474 /* Did another OPEN bump the state's seqid? try again: */ 3475 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3476 dst->seqid = seqid_open; 3477 write_sequnlock(&state->seqlock); 3478 ret = true; 3479 break; 3480 } 3481 3482 /* server says we're behind but we haven't seen the update yet */ 3483 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3484 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3485 write_sequnlock(&state->seqlock); 3486 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3487 3488 if (fatal_signal_pending(current)) 3489 status = -EINTR; 3490 else 3491 if (schedule_timeout(5*HZ) != 0) 3492 status = 0; 3493 3494 finish_wait(&state->waitq, &wait); 3495 3496 if (!status) 3497 continue; 3498 if (status == -EINTR) 3499 break; 3500 3501 /* we slept the whole 5 seconds, we must have lost a seqid */ 3502 dst->seqid = cpu_to_be32(dst_seqid + 1); 3503 ret = true; 3504 break; 3505 } 3506 3507 return ret; 3508 } 3509 3510 struct nfs4_closedata { 3511 struct inode *inode; 3512 struct nfs4_state *state; 3513 struct nfs_closeargs arg; 3514 struct nfs_closeres res; 3515 struct { 3516 struct nfs4_layoutreturn_args arg; 3517 struct nfs4_layoutreturn_res res; 3518 struct nfs4_xdr_opaque_data ld_private; 3519 u32 roc_barrier; 3520 bool roc; 3521 } lr; 3522 struct nfs_fattr fattr; 3523 unsigned long timestamp; 3524 }; 3525 3526 static void nfs4_free_closedata(void *data) 3527 { 3528 struct nfs4_closedata *calldata = data; 3529 struct nfs4_state_owner *sp = calldata->state->owner; 3530 struct super_block *sb = calldata->state->inode->i_sb; 3531 3532 if (calldata->lr.roc) 3533 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3534 calldata->res.lr_ret); 3535 nfs4_put_open_state(calldata->state); 3536 nfs_free_seqid(calldata->arg.seqid); 3537 nfs4_put_state_owner(sp); 3538 nfs_sb_deactive(sb); 3539 kfree(calldata); 3540 } 3541 3542 static void nfs4_close_done(struct rpc_task *task, void *data) 3543 { 3544 struct nfs4_closedata *calldata = data; 3545 struct nfs4_state *state = calldata->state; 3546 struct nfs_server *server = NFS_SERVER(calldata->inode); 3547 nfs4_stateid *res_stateid = NULL; 3548 struct nfs4_exception exception = { 3549 .state = state, 3550 .inode = calldata->inode, 3551 .stateid = &calldata->arg.stateid, 3552 }; 3553 3554 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3555 return; 3556 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3557 3558 /* Handle Layoutreturn errors */ 3559 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3560 &calldata->res.lr_ret) == -EAGAIN) 3561 goto out_restart; 3562 3563 /* hmm. we are done with the inode, and in the process of freeing 3564 * the state_owner. we keep this around to process errors 3565 */ 3566 switch (task->tk_status) { 3567 case 0: 3568 res_stateid = &calldata->res.stateid; 3569 renew_lease(server, calldata->timestamp); 3570 break; 3571 case -NFS4ERR_ACCESS: 3572 if (calldata->arg.bitmask != NULL) { 3573 calldata->arg.bitmask = NULL; 3574 calldata->res.fattr = NULL; 3575 goto out_restart; 3576 3577 } 3578 break; 3579 case -NFS4ERR_OLD_STATEID: 3580 /* Did we race with OPEN? */ 3581 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3582 state)) 3583 goto out_restart; 3584 goto out_release; 3585 case -NFS4ERR_ADMIN_REVOKED: 3586 case -NFS4ERR_STALE_STATEID: 3587 case -NFS4ERR_EXPIRED: 3588 nfs4_free_revoked_stateid(server, 3589 &calldata->arg.stateid, 3590 task->tk_msg.rpc_cred); 3591 fallthrough; 3592 case -NFS4ERR_BAD_STATEID: 3593 if (calldata->arg.fmode == 0) 3594 break; 3595 fallthrough; 3596 default: 3597 task->tk_status = nfs4_async_handle_exception(task, 3598 server, task->tk_status, &exception); 3599 if (exception.retry) 3600 goto out_restart; 3601 } 3602 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3603 res_stateid, calldata->arg.fmode); 3604 out_release: 3605 task->tk_status = 0; 3606 nfs_release_seqid(calldata->arg.seqid); 3607 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3608 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3609 return; 3610 out_restart: 3611 task->tk_status = 0; 3612 rpc_restart_call_prepare(task); 3613 goto out_release; 3614 } 3615 3616 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3617 { 3618 struct nfs4_closedata *calldata = data; 3619 struct nfs4_state *state = calldata->state; 3620 struct inode *inode = calldata->inode; 3621 struct nfs_server *server = NFS_SERVER(inode); 3622 struct pnfs_layout_hdr *lo; 3623 bool is_rdonly, is_wronly, is_rdwr; 3624 int call_close = 0; 3625 3626 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3627 goto out_wait; 3628 3629 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3630 spin_lock(&state->owner->so_lock); 3631 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3632 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3633 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3634 /* Calculate the change in open mode */ 3635 calldata->arg.fmode = 0; 3636 if (state->n_rdwr == 0) { 3637 if (state->n_rdonly == 0) 3638 call_close |= is_rdonly; 3639 else if (is_rdonly) 3640 calldata->arg.fmode |= FMODE_READ; 3641 if (state->n_wronly == 0) 3642 call_close |= is_wronly; 3643 else if (is_wronly) 3644 calldata->arg.fmode |= FMODE_WRITE; 3645 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3646 call_close |= is_rdwr; 3647 } else if (is_rdwr) 3648 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3649 3650 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3651 if (!nfs4_valid_open_stateid(state)) 3652 call_close = 0; 3653 spin_unlock(&state->owner->so_lock); 3654 3655 if (!call_close) { 3656 /* Note: exit _without_ calling nfs4_close_done */ 3657 goto out_no_action; 3658 } 3659 3660 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3661 nfs_release_seqid(calldata->arg.seqid); 3662 goto out_wait; 3663 } 3664 3665 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3666 if (lo && !pnfs_layout_is_valid(lo)) { 3667 calldata->arg.lr_args = NULL; 3668 calldata->res.lr_res = NULL; 3669 } 3670 3671 if (calldata->arg.fmode == 0) 3672 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3673 3674 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3675 /* Close-to-open cache consistency revalidation */ 3676 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3677 nfs4_bitmask_set(calldata->arg.bitmask_store, 3678 server->cache_consistency_bitmask, 3679 inode, 0); 3680 calldata->arg.bitmask = calldata->arg.bitmask_store; 3681 } else 3682 calldata->arg.bitmask = NULL; 3683 } 3684 3685 calldata->arg.share_access = 3686 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3687 calldata->arg.fmode, 0); 3688 3689 if (calldata->res.fattr == NULL) 3690 calldata->arg.bitmask = NULL; 3691 else if (calldata->arg.bitmask == NULL) 3692 calldata->res.fattr = NULL; 3693 calldata->timestamp = jiffies; 3694 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3695 &calldata->arg.seq_args, 3696 &calldata->res.seq_res, 3697 task) != 0) 3698 nfs_release_seqid(calldata->arg.seqid); 3699 return; 3700 out_no_action: 3701 task->tk_action = NULL; 3702 out_wait: 3703 nfs4_sequence_done(task, &calldata->res.seq_res); 3704 } 3705 3706 static const struct rpc_call_ops nfs4_close_ops = { 3707 .rpc_call_prepare = nfs4_close_prepare, 3708 .rpc_call_done = nfs4_close_done, 3709 .rpc_release = nfs4_free_closedata, 3710 }; 3711 3712 /* 3713 * It is possible for data to be read/written from a mem-mapped file 3714 * after the sys_close call (which hits the vfs layer as a flush). 3715 * This means that we can't safely call nfsv4 close on a file until 3716 * the inode is cleared. This in turn means that we are not good 3717 * NFSv4 citizens - we do not indicate to the server to update the file's 3718 * share state even when we are done with one of the three share 3719 * stateid's in the inode. 3720 * 3721 * NOTE: Caller must be holding the sp->so_owner semaphore! 3722 */ 3723 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3724 { 3725 struct nfs_server *server = NFS_SERVER(state->inode); 3726 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3727 struct nfs4_closedata *calldata; 3728 struct nfs4_state_owner *sp = state->owner; 3729 struct rpc_task *task; 3730 struct rpc_message msg = { 3731 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3732 .rpc_cred = state->owner->so_cred, 3733 }; 3734 struct rpc_task_setup task_setup_data = { 3735 .rpc_client = server->client, 3736 .rpc_message = &msg, 3737 .callback_ops = &nfs4_close_ops, 3738 .workqueue = nfsiod_workqueue, 3739 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3740 }; 3741 int status = -ENOMEM; 3742 3743 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3744 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3745 3746 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3747 &task_setup_data.rpc_client, &msg); 3748 3749 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3750 if (calldata == NULL) 3751 goto out; 3752 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3753 calldata->inode = state->inode; 3754 calldata->state = state; 3755 calldata->arg.fh = NFS_FH(state->inode); 3756 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3757 goto out_free_calldata; 3758 /* Serialization for the sequence id */ 3759 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3760 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3761 if (IS_ERR(calldata->arg.seqid)) 3762 goto out_free_calldata; 3763 nfs_fattr_init(&calldata->fattr); 3764 calldata->arg.fmode = 0; 3765 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3766 calldata->res.fattr = &calldata->fattr; 3767 calldata->res.seqid = calldata->arg.seqid; 3768 calldata->res.server = server; 3769 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3770 calldata->lr.roc = pnfs_roc(state->inode, 3771 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3772 if (calldata->lr.roc) { 3773 calldata->arg.lr_args = &calldata->lr.arg; 3774 calldata->res.lr_res = &calldata->lr.res; 3775 } 3776 nfs_sb_active(calldata->inode->i_sb); 3777 3778 msg.rpc_argp = &calldata->arg; 3779 msg.rpc_resp = &calldata->res; 3780 task_setup_data.callback_data = calldata; 3781 task = rpc_run_task(&task_setup_data); 3782 if (IS_ERR(task)) 3783 return PTR_ERR(task); 3784 status = 0; 3785 if (wait) 3786 status = rpc_wait_for_completion_task(task); 3787 rpc_put_task(task); 3788 return status; 3789 out_free_calldata: 3790 kfree(calldata); 3791 out: 3792 nfs4_put_open_state(state); 3793 nfs4_put_state_owner(sp); 3794 return status; 3795 } 3796 3797 static struct inode * 3798 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3799 int open_flags, struct iattr *attr, int *opened) 3800 { 3801 struct nfs4_state *state; 3802 struct nfs4_label l, *label; 3803 3804 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3805 3806 /* Protect against concurrent sillydeletes */ 3807 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3808 3809 nfs4_label_release_security(label); 3810 3811 if (IS_ERR(state)) 3812 return ERR_CAST(state); 3813 return state->inode; 3814 } 3815 3816 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3817 { 3818 if (ctx->state == NULL) 3819 return; 3820 if (is_sync) 3821 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3822 else 3823 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3824 } 3825 3826 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3827 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3828 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3829 3830 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3831 { 3832 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3833 struct nfs4_server_caps_arg args = { 3834 .fhandle = fhandle, 3835 .bitmask = bitmask, 3836 }; 3837 struct nfs4_server_caps_res res = {}; 3838 struct rpc_message msg = { 3839 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3840 .rpc_argp = &args, 3841 .rpc_resp = &res, 3842 }; 3843 int status; 3844 int i; 3845 3846 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3847 FATTR4_WORD0_FH_EXPIRE_TYPE | 3848 FATTR4_WORD0_LINK_SUPPORT | 3849 FATTR4_WORD0_SYMLINK_SUPPORT | 3850 FATTR4_WORD0_ACLSUPPORT | 3851 FATTR4_WORD0_CASE_INSENSITIVE | 3852 FATTR4_WORD0_CASE_PRESERVING; 3853 if (minorversion) 3854 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3855 3856 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3857 if (status == 0) { 3858 /* Sanity check the server answers */ 3859 switch (minorversion) { 3860 case 0: 3861 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3862 res.attr_bitmask[2] = 0; 3863 break; 3864 case 1: 3865 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3866 break; 3867 case 2: 3868 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3869 } 3870 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3871 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3872 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3873 server->fattr_valid = NFS_ATTR_FATTR_V4; 3874 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3875 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3876 server->caps |= NFS_CAP_ACLS; 3877 if (res.has_links != 0) 3878 server->caps |= NFS_CAP_HARDLINKS; 3879 if (res.has_symlinks != 0) 3880 server->caps |= NFS_CAP_SYMLINKS; 3881 if (res.case_insensitive) 3882 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3883 if (res.case_preserving) 3884 server->caps |= NFS_CAP_CASE_PRESERVING; 3885 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3886 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3887 server->caps |= NFS_CAP_SECURITY_LABEL; 3888 #endif 3889 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3890 server->caps |= NFS_CAP_FS_LOCATIONS; 3891 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3892 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3893 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3894 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3895 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3896 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3897 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3898 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3899 NFS_ATTR_FATTR_OWNER_NAME); 3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3901 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3902 NFS_ATTR_FATTR_GROUP_NAME); 3903 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3904 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3905 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3906 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3907 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3908 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3909 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3910 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3911 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3912 sizeof(server->attr_bitmask)); 3913 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3914 3915 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3916 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3917 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3918 server->cache_consistency_bitmask[2] = 0; 3919 3920 /* Avoid a regression due to buggy server */ 3921 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3922 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3923 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3924 sizeof(server->exclcreat_bitmask)); 3925 3926 server->acl_bitmask = res.acl_bitmask; 3927 server->fh_expire_type = res.fh_expire_type; 3928 } 3929 3930 return status; 3931 } 3932 3933 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3934 { 3935 struct nfs4_exception exception = { 3936 .interruptible = true, 3937 }; 3938 int err; 3939 3940 nfs4_server_set_init_caps(server); 3941 do { 3942 err = nfs4_handle_exception(server, 3943 _nfs4_server_capabilities(server, fhandle), 3944 &exception); 3945 } while (exception.retry); 3946 return err; 3947 } 3948 3949 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3950 struct nfs_client *clp, 3951 struct nfs_server *server) 3952 { 3953 int i; 3954 3955 for (i = 0; i < location->nservers; i++) { 3956 struct nfs4_string *srv_loc = &location->servers[i]; 3957 struct sockaddr_storage addr; 3958 size_t addrlen; 3959 struct xprt_create xprt_args = { 3960 .ident = 0, 3961 .net = clp->cl_net, 3962 }; 3963 struct nfs4_add_xprt_data xprtdata = { 3964 .clp = clp, 3965 }; 3966 struct rpc_add_xprt_test rpcdata = { 3967 .add_xprt_test = clp->cl_mvops->session_trunk, 3968 .data = &xprtdata, 3969 }; 3970 char *servername = NULL; 3971 3972 if (!srv_loc->len) 3973 continue; 3974 3975 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3976 &addr, sizeof(addr), 3977 clp->cl_net, server->port); 3978 if (!addrlen) 3979 return; 3980 xprt_args.dstaddr = (struct sockaddr *)&addr; 3981 xprt_args.addrlen = addrlen; 3982 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3983 if (!servername) 3984 return; 3985 memcpy(servername, srv_loc->data, srv_loc->len); 3986 servername[srv_loc->len] = '\0'; 3987 xprt_args.servername = servername; 3988 3989 xprtdata.cred = nfs4_get_clid_cred(clp); 3990 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3991 rpc_clnt_setup_test_and_add_xprt, 3992 &rpcdata); 3993 if (xprtdata.cred) 3994 put_cred(xprtdata.cred); 3995 kfree(servername); 3996 } 3997 } 3998 3999 static int _nfs4_discover_trunking(struct nfs_server *server, 4000 struct nfs_fh *fhandle) 4001 { 4002 struct nfs4_fs_locations *locations = NULL; 4003 struct page *page; 4004 const struct cred *cred; 4005 struct nfs_client *clp = server->nfs_client; 4006 const struct nfs4_state_maintenance_ops *ops = 4007 clp->cl_mvops->state_renewal_ops; 4008 int status = -ENOMEM, i; 4009 4010 cred = ops->get_state_renewal_cred(clp); 4011 if (cred == NULL) { 4012 cred = nfs4_get_clid_cred(clp); 4013 if (cred == NULL) 4014 return -ENOKEY; 4015 } 4016 4017 page = alloc_page(GFP_KERNEL); 4018 if (!page) 4019 goto out_put_cred; 4020 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4021 if (!locations) 4022 goto out_free; 4023 locations->fattr = nfs_alloc_fattr(); 4024 if (!locations->fattr) 4025 goto out_free_2; 4026 4027 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4028 cred); 4029 if (status) 4030 goto out_free_3; 4031 4032 for (i = 0; i < locations->nlocations; i++) 4033 test_fs_location_for_trunking(&locations->locations[i], clp, 4034 server); 4035 out_free_3: 4036 kfree(locations->fattr); 4037 out_free_2: 4038 kfree(locations); 4039 out_free: 4040 __free_page(page); 4041 out_put_cred: 4042 put_cred(cred); 4043 return status; 4044 } 4045 4046 static int nfs4_discover_trunking(struct nfs_server *server, 4047 struct nfs_fh *fhandle) 4048 { 4049 struct nfs4_exception exception = { 4050 .interruptible = true, 4051 }; 4052 struct nfs_client *clp = server->nfs_client; 4053 int err = 0; 4054 4055 if (!nfs4_has_session(clp)) 4056 goto out; 4057 do { 4058 err = nfs4_handle_exception(server, 4059 _nfs4_discover_trunking(server, fhandle), 4060 &exception); 4061 } while (exception.retry); 4062 out: 4063 return err; 4064 } 4065 4066 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4067 struct nfs_fsinfo *info) 4068 { 4069 u32 bitmask[3]; 4070 struct nfs4_lookup_root_arg args = { 4071 .bitmask = bitmask, 4072 }; 4073 struct nfs4_lookup_res res = { 4074 .server = server, 4075 .fattr = info->fattr, 4076 .fh = fhandle, 4077 }; 4078 struct rpc_message msg = { 4079 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4080 .rpc_argp = &args, 4081 .rpc_resp = &res, 4082 }; 4083 4084 bitmask[0] = nfs4_fattr_bitmap[0]; 4085 bitmask[1] = nfs4_fattr_bitmap[1]; 4086 /* 4087 * Process the label in the upcoming getfattr 4088 */ 4089 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4090 4091 nfs_fattr_init(info->fattr); 4092 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4093 } 4094 4095 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4096 struct nfs_fsinfo *info) 4097 { 4098 struct nfs4_exception exception = { 4099 .interruptible = true, 4100 }; 4101 int err; 4102 do { 4103 err = _nfs4_lookup_root(server, fhandle, info); 4104 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4105 switch (err) { 4106 case 0: 4107 case -NFS4ERR_WRONGSEC: 4108 goto out; 4109 default: 4110 err = nfs4_handle_exception(server, err, &exception); 4111 } 4112 } while (exception.retry); 4113 out: 4114 return err; 4115 } 4116 4117 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4118 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4119 { 4120 struct rpc_auth_create_args auth_args = { 4121 .pseudoflavor = flavor, 4122 }; 4123 struct rpc_auth *auth; 4124 4125 auth = rpcauth_create(&auth_args, server->client); 4126 if (IS_ERR(auth)) 4127 return -EACCES; 4128 return nfs4_lookup_root(server, fhandle, info); 4129 } 4130 4131 /* 4132 * Retry pseudoroot lookup with various security flavors. We do this when: 4133 * 4134 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4135 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4136 * 4137 * Returns zero on success, or a negative NFS4ERR value, or a 4138 * negative errno value. 4139 */ 4140 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4141 struct nfs_fsinfo *info) 4142 { 4143 /* Per 3530bis 15.33.5 */ 4144 static const rpc_authflavor_t flav_array[] = { 4145 RPC_AUTH_GSS_KRB5P, 4146 RPC_AUTH_GSS_KRB5I, 4147 RPC_AUTH_GSS_KRB5, 4148 RPC_AUTH_UNIX, /* courtesy */ 4149 RPC_AUTH_NULL, 4150 }; 4151 int status = -EPERM; 4152 size_t i; 4153 4154 if (server->auth_info.flavor_len > 0) { 4155 /* try each flavor specified by user */ 4156 for (i = 0; i < server->auth_info.flavor_len; i++) { 4157 status = nfs4_lookup_root_sec(server, fhandle, info, 4158 server->auth_info.flavors[i]); 4159 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4160 continue; 4161 break; 4162 } 4163 } else { 4164 /* no flavors specified by user, try default list */ 4165 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4166 status = nfs4_lookup_root_sec(server, fhandle, info, 4167 flav_array[i]); 4168 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4169 continue; 4170 break; 4171 } 4172 } 4173 4174 /* 4175 * -EACCES could mean that the user doesn't have correct permissions 4176 * to access the mount. It could also mean that we tried to mount 4177 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4178 * existing mount programs don't handle -EACCES very well so it should 4179 * be mapped to -EPERM instead. 4180 */ 4181 if (status == -EACCES) 4182 status = -EPERM; 4183 return status; 4184 } 4185 4186 /** 4187 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4188 * @server: initialized nfs_server handle 4189 * @fhandle: we fill in the pseudo-fs root file handle 4190 * @info: we fill in an FSINFO struct 4191 * @auth_probe: probe the auth flavours 4192 * 4193 * Returns zero on success, or a negative errno. 4194 */ 4195 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4196 struct nfs_fsinfo *info, 4197 bool auth_probe) 4198 { 4199 int status = 0; 4200 4201 if (!auth_probe) 4202 status = nfs4_lookup_root(server, fhandle, info); 4203 4204 if (auth_probe || status == NFS4ERR_WRONGSEC) 4205 status = server->nfs_client->cl_mvops->find_root_sec(server, 4206 fhandle, info); 4207 4208 if (status == 0) 4209 status = nfs4_server_capabilities(server, fhandle); 4210 if (status == 0) 4211 status = nfs4_do_fsinfo(server, fhandle, info); 4212 4213 return nfs4_map_errors(status); 4214 } 4215 4216 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4217 struct nfs_fsinfo *info) 4218 { 4219 int error; 4220 struct nfs_fattr *fattr = info->fattr; 4221 4222 error = nfs4_server_capabilities(server, mntfh); 4223 if (error < 0) { 4224 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4225 return error; 4226 } 4227 4228 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4229 if (error < 0) { 4230 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4231 goto out; 4232 } 4233 4234 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4235 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4236 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4237 4238 out: 4239 return error; 4240 } 4241 4242 /* 4243 * Get locations and (maybe) other attributes of a referral. 4244 * Note that we'll actually follow the referral later when 4245 * we detect fsid mismatch in inode revalidation 4246 */ 4247 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4248 const struct qstr *name, struct nfs_fattr *fattr, 4249 struct nfs_fh *fhandle) 4250 { 4251 int status = -ENOMEM; 4252 struct page *page = NULL; 4253 struct nfs4_fs_locations *locations = NULL; 4254 4255 page = alloc_page(GFP_KERNEL); 4256 if (page == NULL) 4257 goto out; 4258 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4259 if (locations == NULL) 4260 goto out; 4261 4262 locations->fattr = fattr; 4263 4264 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4265 if (status != 0) 4266 goto out; 4267 4268 /* 4269 * If the fsid didn't change, this is a migration event, not a 4270 * referral. Cause us to drop into the exception handler, which 4271 * will kick off migration recovery. 4272 */ 4273 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4274 dprintk("%s: server did not return a different fsid for" 4275 " a referral at %s\n", __func__, name->name); 4276 status = -NFS4ERR_MOVED; 4277 goto out; 4278 } 4279 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4280 nfs_fixup_referral_attributes(fattr); 4281 memset(fhandle, 0, sizeof(struct nfs_fh)); 4282 out: 4283 if (page) 4284 __free_page(page); 4285 kfree(locations); 4286 return status; 4287 } 4288 4289 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4290 struct nfs_fattr *fattr, struct inode *inode) 4291 { 4292 __u32 bitmask[NFS4_BITMASK_SZ]; 4293 struct nfs4_getattr_arg args = { 4294 .fh = fhandle, 4295 .bitmask = bitmask, 4296 }; 4297 struct nfs4_getattr_res res = { 4298 .fattr = fattr, 4299 .server = server, 4300 }; 4301 struct rpc_message msg = { 4302 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4303 .rpc_argp = &args, 4304 .rpc_resp = &res, 4305 }; 4306 unsigned short task_flags = 0; 4307 4308 if (nfs4_has_session(server->nfs_client)) 4309 task_flags = RPC_TASK_MOVEABLE; 4310 4311 /* Is this is an attribute revalidation, subject to softreval? */ 4312 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4313 task_flags |= RPC_TASK_TIMEOUT; 4314 4315 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4316 nfs_fattr_init(fattr); 4317 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4318 return nfs4_do_call_sync(server->client, server, &msg, 4319 &args.seq_args, &res.seq_res, task_flags); 4320 } 4321 4322 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4323 struct nfs_fattr *fattr, struct inode *inode) 4324 { 4325 struct nfs4_exception exception = { 4326 .interruptible = true, 4327 }; 4328 int err; 4329 do { 4330 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4331 trace_nfs4_getattr(server, fhandle, fattr, err); 4332 err = nfs4_handle_exception(server, err, 4333 &exception); 4334 } while (exception.retry); 4335 return err; 4336 } 4337 4338 /* 4339 * The file is not closed if it is opened due to the a request to change 4340 * the size of the file. The open call will not be needed once the 4341 * VFS layer lookup-intents are implemented. 4342 * 4343 * Close is called when the inode is destroyed. 4344 * If we haven't opened the file for O_WRONLY, we 4345 * need to in the size_change case to obtain a stateid. 4346 * 4347 * Got race? 4348 * Because OPEN is always done by name in nfsv4, it is 4349 * possible that we opened a different file by the same 4350 * name. We can recognize this race condition, but we 4351 * can't do anything about it besides returning an error. 4352 * 4353 * This will be fixed with VFS changes (lookup-intent). 4354 */ 4355 static int 4356 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4357 struct iattr *sattr) 4358 { 4359 struct inode *inode = d_inode(dentry); 4360 const struct cred *cred = NULL; 4361 struct nfs_open_context *ctx = NULL; 4362 int status; 4363 4364 if (pnfs_ld_layoutret_on_setattr(inode) && 4365 sattr->ia_valid & ATTR_SIZE && 4366 sattr->ia_size < i_size_read(inode)) 4367 pnfs_commit_and_return_layout(inode); 4368 4369 nfs_fattr_init(fattr); 4370 4371 /* Deal with open(O_TRUNC) */ 4372 if (sattr->ia_valid & ATTR_OPEN) 4373 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4374 4375 /* Optimization: if the end result is no change, don't RPC */ 4376 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4377 return 0; 4378 4379 /* Search for an existing open(O_WRITE) file */ 4380 if (sattr->ia_valid & ATTR_FILE) { 4381 4382 ctx = nfs_file_open_context(sattr->ia_file); 4383 if (ctx) 4384 cred = ctx->cred; 4385 } 4386 4387 /* Return any delegations if we're going to change ACLs */ 4388 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4389 nfs4_inode_make_writeable(inode); 4390 4391 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4392 if (status == 0) { 4393 nfs_setattr_update_inode(inode, sattr, fattr); 4394 nfs_setsecurity(inode, fattr); 4395 } 4396 return status; 4397 } 4398 4399 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4400 struct dentry *dentry, struct nfs_fh *fhandle, 4401 struct nfs_fattr *fattr) 4402 { 4403 struct nfs_server *server = NFS_SERVER(dir); 4404 int status; 4405 struct nfs4_lookup_arg args = { 4406 .bitmask = server->attr_bitmask, 4407 .dir_fh = NFS_FH(dir), 4408 .name = &dentry->d_name, 4409 }; 4410 struct nfs4_lookup_res res = { 4411 .server = server, 4412 .fattr = fattr, 4413 .fh = fhandle, 4414 }; 4415 struct rpc_message msg = { 4416 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4417 .rpc_argp = &args, 4418 .rpc_resp = &res, 4419 }; 4420 unsigned short task_flags = 0; 4421 4422 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4423 task_flags = RPC_TASK_MOVEABLE; 4424 4425 /* Is this is an attribute revalidation, subject to softreval? */ 4426 if (nfs_lookup_is_soft_revalidate(dentry)) 4427 task_flags |= RPC_TASK_TIMEOUT; 4428 4429 args.bitmask = nfs4_bitmask(server, fattr->label); 4430 4431 nfs_fattr_init(fattr); 4432 4433 dprintk("NFS call lookup %pd2\n", dentry); 4434 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4435 status = nfs4_do_call_sync(clnt, server, &msg, 4436 &args.seq_args, &res.seq_res, task_flags); 4437 dprintk("NFS reply lookup: %d\n", status); 4438 return status; 4439 } 4440 4441 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4442 { 4443 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4444 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4445 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4446 fattr->nlink = 2; 4447 } 4448 4449 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4450 struct dentry *dentry, struct nfs_fh *fhandle, 4451 struct nfs_fattr *fattr) 4452 { 4453 struct nfs4_exception exception = { 4454 .interruptible = true, 4455 }; 4456 struct rpc_clnt *client = *clnt; 4457 const struct qstr *name = &dentry->d_name; 4458 int err; 4459 do { 4460 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4461 trace_nfs4_lookup(dir, name, err); 4462 switch (err) { 4463 case -NFS4ERR_BADNAME: 4464 err = -ENOENT; 4465 goto out; 4466 case -NFS4ERR_MOVED: 4467 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4468 if (err == -NFS4ERR_MOVED) 4469 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4470 goto out; 4471 case -NFS4ERR_WRONGSEC: 4472 err = -EPERM; 4473 if (client != *clnt) 4474 goto out; 4475 client = nfs4_negotiate_security(client, dir, name); 4476 if (IS_ERR(client)) 4477 return PTR_ERR(client); 4478 4479 exception.retry = 1; 4480 break; 4481 default: 4482 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4483 } 4484 } while (exception.retry); 4485 4486 out: 4487 if (err == 0) 4488 *clnt = client; 4489 else if (client != *clnt) 4490 rpc_shutdown_client(client); 4491 4492 return err; 4493 } 4494 4495 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4496 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4497 { 4498 int status; 4499 struct rpc_clnt *client = NFS_CLIENT(dir); 4500 4501 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4502 if (client != NFS_CLIENT(dir)) { 4503 rpc_shutdown_client(client); 4504 nfs_fixup_secinfo_attributes(fattr); 4505 } 4506 return status; 4507 } 4508 4509 struct rpc_clnt * 4510 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4511 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4512 { 4513 struct rpc_clnt *client = NFS_CLIENT(dir); 4514 int status; 4515 4516 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4517 if (status < 0) 4518 return ERR_PTR(status); 4519 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4520 } 4521 4522 static int _nfs4_proc_lookupp(struct inode *inode, 4523 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4524 { 4525 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4526 struct nfs_server *server = NFS_SERVER(inode); 4527 int status; 4528 struct nfs4_lookupp_arg args = { 4529 .bitmask = server->attr_bitmask, 4530 .fh = NFS_FH(inode), 4531 }; 4532 struct nfs4_lookupp_res res = { 4533 .server = server, 4534 .fattr = fattr, 4535 .fh = fhandle, 4536 }; 4537 struct rpc_message msg = { 4538 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4539 .rpc_argp = &args, 4540 .rpc_resp = &res, 4541 }; 4542 unsigned short task_flags = 0; 4543 4544 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4545 task_flags |= RPC_TASK_TIMEOUT; 4546 4547 args.bitmask = nfs4_bitmask(server, fattr->label); 4548 4549 nfs_fattr_init(fattr); 4550 4551 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4552 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4553 &res.seq_res, task_flags); 4554 dprintk("NFS reply lookupp: %d\n", status); 4555 return status; 4556 } 4557 4558 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4559 struct nfs_fattr *fattr) 4560 { 4561 struct nfs4_exception exception = { 4562 .interruptible = true, 4563 }; 4564 int err; 4565 do { 4566 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4567 trace_nfs4_lookupp(inode, err); 4568 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4569 &exception); 4570 } while (exception.retry); 4571 return err; 4572 } 4573 4574 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4575 const struct cred *cred) 4576 { 4577 struct nfs_server *server = NFS_SERVER(inode); 4578 struct nfs4_accessargs args = { 4579 .fh = NFS_FH(inode), 4580 .access = entry->mask, 4581 }; 4582 struct nfs4_accessres res = { 4583 .server = server, 4584 }; 4585 struct rpc_message msg = { 4586 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4587 .rpc_argp = &args, 4588 .rpc_resp = &res, 4589 .rpc_cred = cred, 4590 }; 4591 int status = 0; 4592 4593 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4594 res.fattr = nfs_alloc_fattr(); 4595 if (res.fattr == NULL) 4596 return -ENOMEM; 4597 args.bitmask = server->cache_consistency_bitmask; 4598 } 4599 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4600 if (!status) { 4601 nfs_access_set_mask(entry, res.access); 4602 if (res.fattr) 4603 nfs_refresh_inode(inode, res.fattr); 4604 } 4605 nfs_free_fattr(res.fattr); 4606 return status; 4607 } 4608 4609 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4610 const struct cred *cred) 4611 { 4612 struct nfs4_exception exception = { 4613 .interruptible = true, 4614 }; 4615 int err; 4616 do { 4617 err = _nfs4_proc_access(inode, entry, cred); 4618 trace_nfs4_access(inode, err); 4619 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4620 &exception); 4621 } while (exception.retry); 4622 return err; 4623 } 4624 4625 /* 4626 * TODO: For the time being, we don't try to get any attributes 4627 * along with any of the zero-copy operations READ, READDIR, 4628 * READLINK, WRITE. 4629 * 4630 * In the case of the first three, we want to put the GETATTR 4631 * after the read-type operation -- this is because it is hard 4632 * to predict the length of a GETATTR response in v4, and thus 4633 * align the READ data correctly. This means that the GETATTR 4634 * may end up partially falling into the page cache, and we should 4635 * shift it into the 'tail' of the xdr_buf before processing. 4636 * To do this efficiently, we need to know the total length 4637 * of data received, which doesn't seem to be available outside 4638 * of the RPC layer. 4639 * 4640 * In the case of WRITE, we also want to put the GETATTR after 4641 * the operation -- in this case because we want to make sure 4642 * we get the post-operation mtime and size. 4643 * 4644 * Both of these changes to the XDR layer would in fact be quite 4645 * minor, but I decided to leave them for a subsequent patch. 4646 */ 4647 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4648 unsigned int pgbase, unsigned int pglen) 4649 { 4650 struct nfs4_readlink args = { 4651 .fh = NFS_FH(inode), 4652 .pgbase = pgbase, 4653 .pglen = pglen, 4654 .pages = &page, 4655 }; 4656 struct nfs4_readlink_res res; 4657 struct rpc_message msg = { 4658 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4659 .rpc_argp = &args, 4660 .rpc_resp = &res, 4661 }; 4662 4663 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4664 } 4665 4666 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4667 unsigned int pgbase, unsigned int pglen) 4668 { 4669 struct nfs4_exception exception = { 4670 .interruptible = true, 4671 }; 4672 int err; 4673 do { 4674 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4675 trace_nfs4_readlink(inode, err); 4676 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4677 &exception); 4678 } while (exception.retry); 4679 return err; 4680 } 4681 4682 /* 4683 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4684 */ 4685 static int 4686 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4687 int flags) 4688 { 4689 struct nfs_server *server = NFS_SERVER(dir); 4690 struct nfs4_label l, *ilabel; 4691 struct nfs_open_context *ctx; 4692 struct nfs4_state *state; 4693 int status = 0; 4694 4695 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4696 if (IS_ERR(ctx)) 4697 return PTR_ERR(ctx); 4698 4699 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4700 4701 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4702 sattr->ia_mode &= ~current_umask(); 4703 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4704 if (IS_ERR(state)) { 4705 status = PTR_ERR(state); 4706 goto out; 4707 } 4708 out: 4709 nfs4_label_release_security(ilabel); 4710 put_nfs_open_context(ctx); 4711 return status; 4712 } 4713 4714 static int 4715 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4716 { 4717 struct nfs_server *server = NFS_SERVER(dir); 4718 struct nfs_removeargs args = { 4719 .fh = NFS_FH(dir), 4720 .name = *name, 4721 }; 4722 struct nfs_removeres res = { 4723 .server = server, 4724 }; 4725 struct rpc_message msg = { 4726 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4727 .rpc_argp = &args, 4728 .rpc_resp = &res, 4729 }; 4730 unsigned long timestamp = jiffies; 4731 int status; 4732 4733 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4734 if (status == 0) { 4735 spin_lock(&dir->i_lock); 4736 /* Removing a directory decrements nlink in the parent */ 4737 if (ftype == NF4DIR && dir->i_nlink > 2) 4738 nfs4_dec_nlink_locked(dir); 4739 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4740 NFS_INO_INVALID_DATA); 4741 spin_unlock(&dir->i_lock); 4742 } 4743 return status; 4744 } 4745 4746 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4747 { 4748 struct nfs4_exception exception = { 4749 .interruptible = true, 4750 }; 4751 struct inode *inode = d_inode(dentry); 4752 int err; 4753 4754 if (inode) { 4755 if (inode->i_nlink == 1) 4756 nfs4_inode_return_delegation(inode); 4757 else 4758 nfs4_inode_make_writeable(inode); 4759 } 4760 do { 4761 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4762 trace_nfs4_remove(dir, &dentry->d_name, err); 4763 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4764 &exception); 4765 } while (exception.retry); 4766 return err; 4767 } 4768 4769 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4770 { 4771 struct nfs4_exception exception = { 4772 .interruptible = true, 4773 }; 4774 int err; 4775 4776 do { 4777 err = _nfs4_proc_remove(dir, name, NF4DIR); 4778 trace_nfs4_remove(dir, name, err); 4779 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4780 &exception); 4781 } while (exception.retry); 4782 return err; 4783 } 4784 4785 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4786 struct dentry *dentry, 4787 struct inode *inode) 4788 { 4789 struct nfs_removeargs *args = msg->rpc_argp; 4790 struct nfs_removeres *res = msg->rpc_resp; 4791 4792 res->server = NFS_SB(dentry->d_sb); 4793 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4794 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4795 4796 nfs_fattr_init(res->dir_attr); 4797 4798 if (inode) { 4799 nfs4_inode_return_delegation(inode); 4800 nfs_d_prune_case_insensitive_aliases(inode); 4801 } 4802 } 4803 4804 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4805 { 4806 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4807 &data->args.seq_args, 4808 &data->res.seq_res, 4809 task); 4810 } 4811 4812 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4813 { 4814 struct nfs_unlinkdata *data = task->tk_calldata; 4815 struct nfs_removeres *res = &data->res; 4816 4817 if (!nfs4_sequence_done(task, &res->seq_res)) 4818 return 0; 4819 if (nfs4_async_handle_error(task, res->server, NULL, 4820 &data->timeout) == -EAGAIN) 4821 return 0; 4822 if (task->tk_status == 0) 4823 nfs4_update_changeattr(dir, &res->cinfo, 4824 res->dir_attr->time_start, 4825 NFS_INO_INVALID_DATA); 4826 return 1; 4827 } 4828 4829 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4830 struct dentry *old_dentry, 4831 struct dentry *new_dentry) 4832 { 4833 struct nfs_renameargs *arg = msg->rpc_argp; 4834 struct nfs_renameres *res = msg->rpc_resp; 4835 struct inode *old_inode = d_inode(old_dentry); 4836 struct inode *new_inode = d_inode(new_dentry); 4837 4838 if (old_inode) 4839 nfs4_inode_make_writeable(old_inode); 4840 if (new_inode) 4841 nfs4_inode_return_delegation(new_inode); 4842 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4843 res->server = NFS_SB(old_dentry->d_sb); 4844 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4845 } 4846 4847 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4848 { 4849 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4850 &data->args.seq_args, 4851 &data->res.seq_res, 4852 task); 4853 } 4854 4855 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4856 struct inode *new_dir) 4857 { 4858 struct nfs_renamedata *data = task->tk_calldata; 4859 struct nfs_renameres *res = &data->res; 4860 4861 if (!nfs4_sequence_done(task, &res->seq_res)) 4862 return 0; 4863 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4864 return 0; 4865 4866 if (task->tk_status == 0) { 4867 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4868 if (new_dir != old_dir) { 4869 /* Note: If we moved a directory, nlink will change */ 4870 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4871 res->old_fattr->time_start, 4872 NFS_INO_INVALID_NLINK | 4873 NFS_INO_INVALID_DATA); 4874 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4875 res->new_fattr->time_start, 4876 NFS_INO_INVALID_NLINK | 4877 NFS_INO_INVALID_DATA); 4878 } else 4879 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4880 res->old_fattr->time_start, 4881 NFS_INO_INVALID_DATA); 4882 } 4883 return 1; 4884 } 4885 4886 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4887 { 4888 struct nfs_server *server = NFS_SERVER(inode); 4889 __u32 bitmask[NFS4_BITMASK_SZ]; 4890 struct nfs4_link_arg arg = { 4891 .fh = NFS_FH(inode), 4892 .dir_fh = NFS_FH(dir), 4893 .name = name, 4894 .bitmask = bitmask, 4895 }; 4896 struct nfs4_link_res res = { 4897 .server = server, 4898 }; 4899 struct rpc_message msg = { 4900 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4901 .rpc_argp = &arg, 4902 .rpc_resp = &res, 4903 }; 4904 int status = -ENOMEM; 4905 4906 res.fattr = nfs_alloc_fattr_with_label(server); 4907 if (res.fattr == NULL) 4908 goto out; 4909 4910 nfs4_inode_make_writeable(inode); 4911 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4912 NFS_INO_INVALID_CHANGE); 4913 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4914 if (!status) { 4915 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4916 NFS_INO_INVALID_DATA); 4917 nfs4_inc_nlink(inode); 4918 status = nfs_post_op_update_inode(inode, res.fattr); 4919 if (!status) 4920 nfs_setsecurity(inode, res.fattr); 4921 } 4922 4923 out: 4924 nfs_free_fattr(res.fattr); 4925 return status; 4926 } 4927 4928 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4929 { 4930 struct nfs4_exception exception = { 4931 .interruptible = true, 4932 }; 4933 int err; 4934 do { 4935 err = nfs4_handle_exception(NFS_SERVER(inode), 4936 _nfs4_proc_link(inode, dir, name), 4937 &exception); 4938 } while (exception.retry); 4939 return err; 4940 } 4941 4942 struct nfs4_createdata { 4943 struct rpc_message msg; 4944 struct nfs4_create_arg arg; 4945 struct nfs4_create_res res; 4946 struct nfs_fh fh; 4947 struct nfs_fattr fattr; 4948 }; 4949 4950 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4951 const struct qstr *name, struct iattr *sattr, u32 ftype) 4952 { 4953 struct nfs4_createdata *data; 4954 4955 data = kzalloc(sizeof(*data), GFP_KERNEL); 4956 if (data != NULL) { 4957 struct nfs_server *server = NFS_SERVER(dir); 4958 4959 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4960 if (IS_ERR(data->fattr.label)) 4961 goto out_free; 4962 4963 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4964 data->msg.rpc_argp = &data->arg; 4965 data->msg.rpc_resp = &data->res; 4966 data->arg.dir_fh = NFS_FH(dir); 4967 data->arg.server = server; 4968 data->arg.name = name; 4969 data->arg.attrs = sattr; 4970 data->arg.ftype = ftype; 4971 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4972 data->arg.umask = current_umask(); 4973 data->res.server = server; 4974 data->res.fh = &data->fh; 4975 data->res.fattr = &data->fattr; 4976 nfs_fattr_init(data->res.fattr); 4977 } 4978 return data; 4979 out_free: 4980 kfree(data); 4981 return NULL; 4982 } 4983 4984 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4985 { 4986 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4987 &data->arg.seq_args, &data->res.seq_res, 1); 4988 if (status == 0) { 4989 spin_lock(&dir->i_lock); 4990 /* Creating a directory bumps nlink in the parent */ 4991 if (data->arg.ftype == NF4DIR) 4992 nfs4_inc_nlink_locked(dir); 4993 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 4994 data->res.fattr->time_start, 4995 NFS_INO_INVALID_DATA); 4996 spin_unlock(&dir->i_lock); 4997 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 4998 } 4999 return status; 5000 } 5001 5002 static void nfs4_free_createdata(struct nfs4_createdata *data) 5003 { 5004 nfs4_label_free(data->fattr.label); 5005 kfree(data); 5006 } 5007 5008 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5009 struct page *page, unsigned int len, struct iattr *sattr, 5010 struct nfs4_label *label) 5011 { 5012 struct nfs4_createdata *data; 5013 int status = -ENAMETOOLONG; 5014 5015 if (len > NFS4_MAXPATHLEN) 5016 goto out; 5017 5018 status = -ENOMEM; 5019 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5020 if (data == NULL) 5021 goto out; 5022 5023 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5024 data->arg.u.symlink.pages = &page; 5025 data->arg.u.symlink.len = len; 5026 data->arg.label = label; 5027 5028 status = nfs4_do_create(dir, dentry, data); 5029 5030 nfs4_free_createdata(data); 5031 out: 5032 return status; 5033 } 5034 5035 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5036 struct page *page, unsigned int len, struct iattr *sattr) 5037 { 5038 struct nfs4_exception exception = { 5039 .interruptible = true, 5040 }; 5041 struct nfs4_label l, *label; 5042 int err; 5043 5044 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5045 5046 do { 5047 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5048 trace_nfs4_symlink(dir, &dentry->d_name, err); 5049 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5050 &exception); 5051 } while (exception.retry); 5052 5053 nfs4_label_release_security(label); 5054 return err; 5055 } 5056 5057 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5058 struct iattr *sattr, struct nfs4_label *label) 5059 { 5060 struct nfs4_createdata *data; 5061 int status = -ENOMEM; 5062 5063 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5064 if (data == NULL) 5065 goto out; 5066 5067 data->arg.label = label; 5068 status = nfs4_do_create(dir, dentry, data); 5069 5070 nfs4_free_createdata(data); 5071 out: 5072 return status; 5073 } 5074 5075 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5076 struct iattr *sattr) 5077 { 5078 struct nfs_server *server = NFS_SERVER(dir); 5079 struct nfs4_exception exception = { 5080 .interruptible = true, 5081 }; 5082 struct nfs4_label l, *label; 5083 int err; 5084 5085 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5086 5087 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5088 sattr->ia_mode &= ~current_umask(); 5089 do { 5090 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5091 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5092 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5093 &exception); 5094 } while (exception.retry); 5095 nfs4_label_release_security(label); 5096 5097 return err; 5098 } 5099 5100 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5101 struct nfs_readdir_res *nr_res) 5102 { 5103 struct inode *dir = d_inode(nr_arg->dentry); 5104 struct nfs_server *server = NFS_SERVER(dir); 5105 struct nfs4_readdir_arg args = { 5106 .fh = NFS_FH(dir), 5107 .pages = nr_arg->pages, 5108 .pgbase = 0, 5109 .count = nr_arg->page_len, 5110 .plus = nr_arg->plus, 5111 }; 5112 struct nfs4_readdir_res res; 5113 struct rpc_message msg = { 5114 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5115 .rpc_argp = &args, 5116 .rpc_resp = &res, 5117 .rpc_cred = nr_arg->cred, 5118 }; 5119 int status; 5120 5121 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5122 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5123 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5124 args.bitmask = server->attr_bitmask_nl; 5125 else 5126 args.bitmask = server->attr_bitmask; 5127 5128 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5129 res.pgbase = args.pgbase; 5130 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5131 &res.seq_res, 0); 5132 if (status >= 0) { 5133 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5134 status += args.pgbase; 5135 } 5136 5137 nfs_invalidate_atime(dir); 5138 5139 dprintk("%s: returns %d\n", __func__, status); 5140 return status; 5141 } 5142 5143 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5144 struct nfs_readdir_res *res) 5145 { 5146 struct nfs4_exception exception = { 5147 .interruptible = true, 5148 }; 5149 int err; 5150 do { 5151 err = _nfs4_proc_readdir(arg, res); 5152 trace_nfs4_readdir(d_inode(arg->dentry), err); 5153 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5154 err, &exception); 5155 } while (exception.retry); 5156 return err; 5157 } 5158 5159 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5160 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5161 { 5162 struct nfs4_createdata *data; 5163 int mode = sattr->ia_mode; 5164 int status = -ENOMEM; 5165 5166 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5167 if (data == NULL) 5168 goto out; 5169 5170 if (S_ISFIFO(mode)) 5171 data->arg.ftype = NF4FIFO; 5172 else if (S_ISBLK(mode)) { 5173 data->arg.ftype = NF4BLK; 5174 data->arg.u.device.specdata1 = MAJOR(rdev); 5175 data->arg.u.device.specdata2 = MINOR(rdev); 5176 } 5177 else if (S_ISCHR(mode)) { 5178 data->arg.ftype = NF4CHR; 5179 data->arg.u.device.specdata1 = MAJOR(rdev); 5180 data->arg.u.device.specdata2 = MINOR(rdev); 5181 } else if (!S_ISSOCK(mode)) { 5182 status = -EINVAL; 5183 goto out_free; 5184 } 5185 5186 data->arg.label = label; 5187 status = nfs4_do_create(dir, dentry, data); 5188 out_free: 5189 nfs4_free_createdata(data); 5190 out: 5191 return status; 5192 } 5193 5194 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5195 struct iattr *sattr, dev_t rdev) 5196 { 5197 struct nfs_server *server = NFS_SERVER(dir); 5198 struct nfs4_exception exception = { 5199 .interruptible = true, 5200 }; 5201 struct nfs4_label l, *label; 5202 int err; 5203 5204 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5205 5206 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5207 sattr->ia_mode &= ~current_umask(); 5208 do { 5209 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5210 trace_nfs4_mknod(dir, &dentry->d_name, err); 5211 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5212 &exception); 5213 } while (exception.retry); 5214 5215 nfs4_label_release_security(label); 5216 5217 return err; 5218 } 5219 5220 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5221 struct nfs_fsstat *fsstat) 5222 { 5223 struct nfs4_statfs_arg args = { 5224 .fh = fhandle, 5225 .bitmask = server->attr_bitmask, 5226 }; 5227 struct nfs4_statfs_res res = { 5228 .fsstat = fsstat, 5229 }; 5230 struct rpc_message msg = { 5231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5232 .rpc_argp = &args, 5233 .rpc_resp = &res, 5234 }; 5235 5236 nfs_fattr_init(fsstat->fattr); 5237 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5238 } 5239 5240 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5241 { 5242 struct nfs4_exception exception = { 5243 .interruptible = true, 5244 }; 5245 int err; 5246 do { 5247 err = nfs4_handle_exception(server, 5248 _nfs4_proc_statfs(server, fhandle, fsstat), 5249 &exception); 5250 } while (exception.retry); 5251 return err; 5252 } 5253 5254 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5255 struct nfs_fsinfo *fsinfo) 5256 { 5257 struct nfs4_fsinfo_arg args = { 5258 .fh = fhandle, 5259 .bitmask = server->attr_bitmask, 5260 }; 5261 struct nfs4_fsinfo_res res = { 5262 .fsinfo = fsinfo, 5263 }; 5264 struct rpc_message msg = { 5265 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5266 .rpc_argp = &args, 5267 .rpc_resp = &res, 5268 }; 5269 5270 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5271 } 5272 5273 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5274 { 5275 struct nfs4_exception exception = { 5276 .interruptible = true, 5277 }; 5278 int err; 5279 5280 do { 5281 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5282 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5283 if (err == 0) { 5284 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5285 break; 5286 } 5287 err = nfs4_handle_exception(server, err, &exception); 5288 } while (exception.retry); 5289 return err; 5290 } 5291 5292 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5293 { 5294 int error; 5295 5296 nfs_fattr_init(fsinfo->fattr); 5297 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5298 if (error == 0) { 5299 /* block layout checks this! */ 5300 server->pnfs_blksize = fsinfo->blksize; 5301 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5302 } 5303 5304 return error; 5305 } 5306 5307 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5308 struct nfs_pathconf *pathconf) 5309 { 5310 struct nfs4_pathconf_arg args = { 5311 .fh = fhandle, 5312 .bitmask = server->attr_bitmask, 5313 }; 5314 struct nfs4_pathconf_res res = { 5315 .pathconf = pathconf, 5316 }; 5317 struct rpc_message msg = { 5318 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5319 .rpc_argp = &args, 5320 .rpc_resp = &res, 5321 }; 5322 5323 /* None of the pathconf attributes are mandatory to implement */ 5324 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5325 memset(pathconf, 0, sizeof(*pathconf)); 5326 return 0; 5327 } 5328 5329 nfs_fattr_init(pathconf->fattr); 5330 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5331 } 5332 5333 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5334 struct nfs_pathconf *pathconf) 5335 { 5336 struct nfs4_exception exception = { 5337 .interruptible = true, 5338 }; 5339 int err; 5340 5341 do { 5342 err = nfs4_handle_exception(server, 5343 _nfs4_proc_pathconf(server, fhandle, pathconf), 5344 &exception); 5345 } while (exception.retry); 5346 return err; 5347 } 5348 5349 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5350 const struct nfs_open_context *ctx, 5351 const struct nfs_lock_context *l_ctx, 5352 fmode_t fmode) 5353 { 5354 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5355 } 5356 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5357 5358 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5359 const struct nfs_open_context *ctx, 5360 const struct nfs_lock_context *l_ctx, 5361 fmode_t fmode) 5362 { 5363 nfs4_stateid _current_stateid; 5364 5365 /* If the current stateid represents a lost lock, then exit */ 5366 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5367 return true; 5368 return nfs4_stateid_match(stateid, &_current_stateid); 5369 } 5370 5371 static bool nfs4_error_stateid_expired(int err) 5372 { 5373 switch (err) { 5374 case -NFS4ERR_DELEG_REVOKED: 5375 case -NFS4ERR_ADMIN_REVOKED: 5376 case -NFS4ERR_BAD_STATEID: 5377 case -NFS4ERR_STALE_STATEID: 5378 case -NFS4ERR_OLD_STATEID: 5379 case -NFS4ERR_OPENMODE: 5380 case -NFS4ERR_EXPIRED: 5381 return true; 5382 } 5383 return false; 5384 } 5385 5386 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5387 { 5388 struct nfs_server *server = NFS_SERVER(hdr->inode); 5389 5390 trace_nfs4_read(hdr, task->tk_status); 5391 if (task->tk_status < 0) { 5392 struct nfs4_exception exception = { 5393 .inode = hdr->inode, 5394 .state = hdr->args.context->state, 5395 .stateid = &hdr->args.stateid, 5396 }; 5397 task->tk_status = nfs4_async_handle_exception(task, 5398 server, task->tk_status, &exception); 5399 if (exception.retry) { 5400 rpc_restart_call_prepare(task); 5401 return -EAGAIN; 5402 } 5403 } 5404 5405 if (task->tk_status > 0) 5406 renew_lease(server, hdr->timestamp); 5407 return 0; 5408 } 5409 5410 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5411 struct nfs_pgio_args *args) 5412 { 5413 5414 if (!nfs4_error_stateid_expired(task->tk_status) || 5415 nfs4_stateid_is_current(&args->stateid, 5416 args->context, 5417 args->lock_context, 5418 FMODE_READ)) 5419 return false; 5420 rpc_restart_call_prepare(task); 5421 return true; 5422 } 5423 5424 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5425 struct nfs_pgio_header *hdr) 5426 { 5427 struct nfs_server *server = NFS_SERVER(hdr->inode); 5428 struct rpc_message *msg = &task->tk_msg; 5429 5430 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5431 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5432 server->caps &= ~NFS_CAP_READ_PLUS; 5433 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5434 rpc_restart_call_prepare(task); 5435 return true; 5436 } 5437 return false; 5438 } 5439 5440 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5441 { 5442 if (hdr->res.scratch) 5443 kfree(hdr->res.scratch); 5444 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5445 return -EAGAIN; 5446 if (nfs4_read_stateid_changed(task, &hdr->args)) 5447 return -EAGAIN; 5448 if (nfs4_read_plus_not_supported(task, hdr)) 5449 return -EAGAIN; 5450 if (task->tk_status > 0) 5451 nfs_invalidate_atime(hdr->inode); 5452 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5453 nfs4_read_done_cb(task, hdr); 5454 } 5455 5456 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5457 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5458 struct rpc_message *msg) 5459 { 5460 /* Note: We don't use READ_PLUS with pNFS yet */ 5461 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5462 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5463 hdr->res.scratch = kmalloc(32, GFP_KERNEL); 5464 return hdr->res.scratch != NULL; 5465 } 5466 return false; 5467 } 5468 #else 5469 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5470 struct rpc_message *msg) 5471 { 5472 return false; 5473 } 5474 #endif /* CONFIG_NFS_V4_2 */ 5475 5476 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5477 struct rpc_message *msg) 5478 { 5479 hdr->timestamp = jiffies; 5480 if (!hdr->pgio_done_cb) 5481 hdr->pgio_done_cb = nfs4_read_done_cb; 5482 if (!nfs42_read_plus_support(hdr, msg)) 5483 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5484 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5485 } 5486 5487 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5488 struct nfs_pgio_header *hdr) 5489 { 5490 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5491 &hdr->args.seq_args, 5492 &hdr->res.seq_res, 5493 task)) 5494 return 0; 5495 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5496 hdr->args.lock_context, 5497 hdr->rw_mode) == -EIO) 5498 return -EIO; 5499 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5500 return -EIO; 5501 return 0; 5502 } 5503 5504 static int nfs4_write_done_cb(struct rpc_task *task, 5505 struct nfs_pgio_header *hdr) 5506 { 5507 struct inode *inode = hdr->inode; 5508 5509 trace_nfs4_write(hdr, task->tk_status); 5510 if (task->tk_status < 0) { 5511 struct nfs4_exception exception = { 5512 .inode = hdr->inode, 5513 .state = hdr->args.context->state, 5514 .stateid = &hdr->args.stateid, 5515 }; 5516 task->tk_status = nfs4_async_handle_exception(task, 5517 NFS_SERVER(inode), task->tk_status, 5518 &exception); 5519 if (exception.retry) { 5520 rpc_restart_call_prepare(task); 5521 return -EAGAIN; 5522 } 5523 } 5524 if (task->tk_status >= 0) { 5525 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5526 nfs_writeback_update_inode(hdr); 5527 } 5528 return 0; 5529 } 5530 5531 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5532 struct nfs_pgio_args *args) 5533 { 5534 5535 if (!nfs4_error_stateid_expired(task->tk_status) || 5536 nfs4_stateid_is_current(&args->stateid, 5537 args->context, 5538 args->lock_context, 5539 FMODE_WRITE)) 5540 return false; 5541 rpc_restart_call_prepare(task); 5542 return true; 5543 } 5544 5545 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5546 { 5547 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5548 return -EAGAIN; 5549 if (nfs4_write_stateid_changed(task, &hdr->args)) 5550 return -EAGAIN; 5551 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5552 nfs4_write_done_cb(task, hdr); 5553 } 5554 5555 static 5556 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5557 { 5558 /* Don't request attributes for pNFS or O_DIRECT writes */ 5559 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5560 return false; 5561 /* Otherwise, request attributes if and only if we don't hold 5562 * a delegation 5563 */ 5564 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5565 } 5566 5567 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5568 struct inode *inode, unsigned long cache_validity) 5569 { 5570 struct nfs_server *server = NFS_SERVER(inode); 5571 unsigned int i; 5572 5573 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5574 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5575 5576 if (cache_validity & NFS_INO_INVALID_CHANGE) 5577 bitmask[0] |= FATTR4_WORD0_CHANGE; 5578 if (cache_validity & NFS_INO_INVALID_ATIME) 5579 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5580 if (cache_validity & NFS_INO_INVALID_MODE) 5581 bitmask[1] |= FATTR4_WORD1_MODE; 5582 if (cache_validity & NFS_INO_INVALID_OTHER) 5583 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5584 if (cache_validity & NFS_INO_INVALID_NLINK) 5585 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5586 if (cache_validity & NFS_INO_INVALID_CTIME) 5587 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5588 if (cache_validity & NFS_INO_INVALID_MTIME) 5589 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5590 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5591 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5592 5593 if (cache_validity & NFS_INO_INVALID_SIZE) 5594 bitmask[0] |= FATTR4_WORD0_SIZE; 5595 5596 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5597 bitmask[i] &= server->attr_bitmask[i]; 5598 } 5599 5600 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5601 struct rpc_message *msg, 5602 struct rpc_clnt **clnt) 5603 { 5604 struct nfs_server *server = NFS_SERVER(hdr->inode); 5605 5606 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5607 hdr->args.bitmask = NULL; 5608 hdr->res.fattr = NULL; 5609 } else { 5610 nfs4_bitmask_set(hdr->args.bitmask_store, 5611 server->cache_consistency_bitmask, 5612 hdr->inode, NFS_INO_INVALID_BLOCKS); 5613 hdr->args.bitmask = hdr->args.bitmask_store; 5614 } 5615 5616 if (!hdr->pgio_done_cb) 5617 hdr->pgio_done_cb = nfs4_write_done_cb; 5618 hdr->res.server = server; 5619 hdr->timestamp = jiffies; 5620 5621 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5622 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5623 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5624 } 5625 5626 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5627 { 5628 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5629 &data->args.seq_args, 5630 &data->res.seq_res, 5631 task); 5632 } 5633 5634 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5635 { 5636 struct inode *inode = data->inode; 5637 5638 trace_nfs4_commit(data, task->tk_status); 5639 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5640 NULL, NULL) == -EAGAIN) { 5641 rpc_restart_call_prepare(task); 5642 return -EAGAIN; 5643 } 5644 return 0; 5645 } 5646 5647 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5648 { 5649 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5650 return -EAGAIN; 5651 return data->commit_done_cb(task, data); 5652 } 5653 5654 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5655 struct rpc_clnt **clnt) 5656 { 5657 struct nfs_server *server = NFS_SERVER(data->inode); 5658 5659 if (data->commit_done_cb == NULL) 5660 data->commit_done_cb = nfs4_commit_done_cb; 5661 data->res.server = server; 5662 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5663 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5664 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5665 } 5666 5667 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5668 struct nfs_commitres *res) 5669 { 5670 struct inode *dst_inode = file_inode(dst); 5671 struct nfs_server *server = NFS_SERVER(dst_inode); 5672 struct rpc_message msg = { 5673 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5674 .rpc_argp = args, 5675 .rpc_resp = res, 5676 }; 5677 5678 args->fh = NFS_FH(dst_inode); 5679 return nfs4_call_sync(server->client, server, &msg, 5680 &args->seq_args, &res->seq_res, 1); 5681 } 5682 5683 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5684 { 5685 struct nfs_commitargs args = { 5686 .offset = offset, 5687 .count = count, 5688 }; 5689 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5690 struct nfs4_exception exception = { }; 5691 int status; 5692 5693 do { 5694 status = _nfs4_proc_commit(dst, &args, res); 5695 status = nfs4_handle_exception(dst_server, status, &exception); 5696 } while (exception.retry); 5697 5698 return status; 5699 } 5700 5701 struct nfs4_renewdata { 5702 struct nfs_client *client; 5703 unsigned long timestamp; 5704 }; 5705 5706 /* 5707 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5708 * standalone procedure for queueing an asynchronous RENEW. 5709 */ 5710 static void nfs4_renew_release(void *calldata) 5711 { 5712 struct nfs4_renewdata *data = calldata; 5713 struct nfs_client *clp = data->client; 5714 5715 if (refcount_read(&clp->cl_count) > 1) 5716 nfs4_schedule_state_renewal(clp); 5717 nfs_put_client(clp); 5718 kfree(data); 5719 } 5720 5721 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5722 { 5723 struct nfs4_renewdata *data = calldata; 5724 struct nfs_client *clp = data->client; 5725 unsigned long timestamp = data->timestamp; 5726 5727 trace_nfs4_renew_async(clp, task->tk_status); 5728 switch (task->tk_status) { 5729 case 0: 5730 break; 5731 case -NFS4ERR_LEASE_MOVED: 5732 nfs4_schedule_lease_moved_recovery(clp); 5733 break; 5734 default: 5735 /* Unless we're shutting down, schedule state recovery! */ 5736 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5737 return; 5738 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5739 nfs4_schedule_lease_recovery(clp); 5740 return; 5741 } 5742 nfs4_schedule_path_down_recovery(clp); 5743 } 5744 do_renew_lease(clp, timestamp); 5745 } 5746 5747 static const struct rpc_call_ops nfs4_renew_ops = { 5748 .rpc_call_done = nfs4_renew_done, 5749 .rpc_release = nfs4_renew_release, 5750 }; 5751 5752 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5753 { 5754 struct rpc_message msg = { 5755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5756 .rpc_argp = clp, 5757 .rpc_cred = cred, 5758 }; 5759 struct nfs4_renewdata *data; 5760 5761 if (renew_flags == 0) 5762 return 0; 5763 if (!refcount_inc_not_zero(&clp->cl_count)) 5764 return -EIO; 5765 data = kmalloc(sizeof(*data), GFP_NOFS); 5766 if (data == NULL) { 5767 nfs_put_client(clp); 5768 return -ENOMEM; 5769 } 5770 data->client = clp; 5771 data->timestamp = jiffies; 5772 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5773 &nfs4_renew_ops, data); 5774 } 5775 5776 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5777 { 5778 struct rpc_message msg = { 5779 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5780 .rpc_argp = clp, 5781 .rpc_cred = cred, 5782 }; 5783 unsigned long now = jiffies; 5784 int status; 5785 5786 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5787 if (status < 0) 5788 return status; 5789 do_renew_lease(clp, now); 5790 return 0; 5791 } 5792 5793 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5794 enum nfs4_acl_type type) 5795 { 5796 switch (type) { 5797 default: 5798 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5799 case NFS4ACL_DACL: 5800 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5801 case NFS4ACL_SACL: 5802 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5803 } 5804 } 5805 5806 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5807 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5808 * the stack. 5809 */ 5810 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5811 5812 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5813 struct page **pages) 5814 { 5815 struct page *newpage, **spages; 5816 int rc = 0; 5817 size_t len; 5818 spages = pages; 5819 5820 do { 5821 len = min_t(size_t, PAGE_SIZE, buflen); 5822 newpage = alloc_page(GFP_KERNEL); 5823 5824 if (newpage == NULL) 5825 goto unwind; 5826 memcpy(page_address(newpage), buf, len); 5827 buf += len; 5828 buflen -= len; 5829 *pages++ = newpage; 5830 rc++; 5831 } while (buflen != 0); 5832 5833 return rc; 5834 5835 unwind: 5836 for(; rc > 0; rc--) 5837 __free_page(spages[rc-1]); 5838 return -ENOMEM; 5839 } 5840 5841 struct nfs4_cached_acl { 5842 enum nfs4_acl_type type; 5843 int cached; 5844 size_t len; 5845 char data[]; 5846 }; 5847 5848 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5849 { 5850 struct nfs_inode *nfsi = NFS_I(inode); 5851 5852 spin_lock(&inode->i_lock); 5853 kfree(nfsi->nfs4_acl); 5854 nfsi->nfs4_acl = acl; 5855 spin_unlock(&inode->i_lock); 5856 } 5857 5858 static void nfs4_zap_acl_attr(struct inode *inode) 5859 { 5860 nfs4_set_cached_acl(inode, NULL); 5861 } 5862 5863 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5864 size_t buflen, enum nfs4_acl_type type) 5865 { 5866 struct nfs_inode *nfsi = NFS_I(inode); 5867 struct nfs4_cached_acl *acl; 5868 int ret = -ENOENT; 5869 5870 spin_lock(&inode->i_lock); 5871 acl = nfsi->nfs4_acl; 5872 if (acl == NULL) 5873 goto out; 5874 if (acl->type != type) 5875 goto out; 5876 if (buf == NULL) /* user is just asking for length */ 5877 goto out_len; 5878 if (acl->cached == 0) 5879 goto out; 5880 ret = -ERANGE; /* see getxattr(2) man page */ 5881 if (acl->len > buflen) 5882 goto out; 5883 memcpy(buf, acl->data, acl->len); 5884 out_len: 5885 ret = acl->len; 5886 out: 5887 spin_unlock(&inode->i_lock); 5888 return ret; 5889 } 5890 5891 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5892 size_t pgbase, size_t acl_len, 5893 enum nfs4_acl_type type) 5894 { 5895 struct nfs4_cached_acl *acl; 5896 size_t buflen = sizeof(*acl) + acl_len; 5897 5898 if (buflen <= PAGE_SIZE) { 5899 acl = kmalloc(buflen, GFP_KERNEL); 5900 if (acl == NULL) 5901 goto out; 5902 acl->cached = 1; 5903 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5904 } else { 5905 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5906 if (acl == NULL) 5907 goto out; 5908 acl->cached = 0; 5909 } 5910 acl->type = type; 5911 acl->len = acl_len; 5912 out: 5913 nfs4_set_cached_acl(inode, acl); 5914 } 5915 5916 /* 5917 * The getxattr API returns the required buffer length when called with a 5918 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5919 * the required buf. On a NULL buf, we send a page of data to the server 5920 * guessing that the ACL request can be serviced by a page. If so, we cache 5921 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5922 * the cache. If not so, we throw away the page, and cache the required 5923 * length. The next getxattr call will then produce another round trip to 5924 * the server, this time with the input buf of the required size. 5925 */ 5926 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5927 size_t buflen, enum nfs4_acl_type type) 5928 { 5929 struct page **pages; 5930 struct nfs_getaclargs args = { 5931 .fh = NFS_FH(inode), 5932 .acl_type = type, 5933 .acl_len = buflen, 5934 }; 5935 struct nfs_getaclres res = { 5936 .acl_type = type, 5937 .acl_len = buflen, 5938 }; 5939 struct rpc_message msg = { 5940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5941 .rpc_argp = &args, 5942 .rpc_resp = &res, 5943 }; 5944 unsigned int npages; 5945 int ret = -ENOMEM, i; 5946 struct nfs_server *server = NFS_SERVER(inode); 5947 5948 if (buflen == 0) 5949 buflen = server->rsize; 5950 5951 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5952 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5953 if (!pages) 5954 return -ENOMEM; 5955 5956 args.acl_pages = pages; 5957 5958 for (i = 0; i < npages; i++) { 5959 pages[i] = alloc_page(GFP_KERNEL); 5960 if (!pages[i]) 5961 goto out_free; 5962 } 5963 5964 /* for decoding across pages */ 5965 res.acl_scratch = alloc_page(GFP_KERNEL); 5966 if (!res.acl_scratch) 5967 goto out_free; 5968 5969 args.acl_len = npages * PAGE_SIZE; 5970 5971 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5972 __func__, buf, buflen, npages, args.acl_len); 5973 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5974 &msg, &args.seq_args, &res.seq_res, 0); 5975 if (ret) 5976 goto out_free; 5977 5978 /* Handle the case where the passed-in buffer is too short */ 5979 if (res.acl_flags & NFS4_ACL_TRUNC) { 5980 /* Did the user only issue a request for the acl length? */ 5981 if (buf == NULL) 5982 goto out_ok; 5983 ret = -ERANGE; 5984 goto out_free; 5985 } 5986 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5987 type); 5988 if (buf) { 5989 if (res.acl_len > buflen) { 5990 ret = -ERANGE; 5991 goto out_free; 5992 } 5993 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5994 } 5995 out_ok: 5996 ret = res.acl_len; 5997 out_free: 5998 for (i = 0; i < npages; i++) 5999 if (pages[i]) 6000 __free_page(pages[i]); 6001 if (res.acl_scratch) 6002 __free_page(res.acl_scratch); 6003 kfree(pages); 6004 return ret; 6005 } 6006 6007 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6008 size_t buflen, enum nfs4_acl_type type) 6009 { 6010 struct nfs4_exception exception = { 6011 .interruptible = true, 6012 }; 6013 ssize_t ret; 6014 do { 6015 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6016 trace_nfs4_get_acl(inode, ret); 6017 if (ret >= 0) 6018 break; 6019 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6020 } while (exception.retry); 6021 return ret; 6022 } 6023 6024 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6025 enum nfs4_acl_type type) 6026 { 6027 struct nfs_server *server = NFS_SERVER(inode); 6028 int ret; 6029 6030 if (!nfs4_server_supports_acls(server, type)) 6031 return -EOPNOTSUPP; 6032 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6033 if (ret < 0) 6034 return ret; 6035 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6036 nfs_zap_acl_cache(inode); 6037 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6038 if (ret != -ENOENT) 6039 /* -ENOENT is returned if there is no ACL or if there is an ACL 6040 * but no cached acl data, just the acl length */ 6041 return ret; 6042 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6043 } 6044 6045 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6046 size_t buflen, enum nfs4_acl_type type) 6047 { 6048 struct nfs_server *server = NFS_SERVER(inode); 6049 struct page *pages[NFS4ACL_MAXPAGES]; 6050 struct nfs_setaclargs arg = { 6051 .fh = NFS_FH(inode), 6052 .acl_type = type, 6053 .acl_len = buflen, 6054 .acl_pages = pages, 6055 }; 6056 struct nfs_setaclres res; 6057 struct rpc_message msg = { 6058 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6059 .rpc_argp = &arg, 6060 .rpc_resp = &res, 6061 }; 6062 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6063 int ret, i; 6064 6065 /* You can't remove system.nfs4_acl: */ 6066 if (buflen == 0) 6067 return -EINVAL; 6068 if (!nfs4_server_supports_acls(server, type)) 6069 return -EOPNOTSUPP; 6070 if (npages > ARRAY_SIZE(pages)) 6071 return -ERANGE; 6072 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6073 if (i < 0) 6074 return i; 6075 nfs4_inode_make_writeable(inode); 6076 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6077 6078 /* 6079 * Free each page after tx, so the only ref left is 6080 * held by the network stack 6081 */ 6082 for (; i > 0; i--) 6083 put_page(pages[i-1]); 6084 6085 /* 6086 * Acl update can result in inode attribute update. 6087 * so mark the attribute cache invalid. 6088 */ 6089 spin_lock(&inode->i_lock); 6090 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6091 NFS_INO_INVALID_CTIME | 6092 NFS_INO_REVAL_FORCED); 6093 spin_unlock(&inode->i_lock); 6094 nfs_access_zap_cache(inode); 6095 nfs_zap_acl_cache(inode); 6096 return ret; 6097 } 6098 6099 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6100 size_t buflen, enum nfs4_acl_type type) 6101 { 6102 struct nfs4_exception exception = { }; 6103 int err; 6104 do { 6105 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6106 trace_nfs4_set_acl(inode, err); 6107 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6108 /* 6109 * no need to retry since the kernel 6110 * isn't involved in encoding the ACEs. 6111 */ 6112 err = -EINVAL; 6113 break; 6114 } 6115 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6116 &exception); 6117 } while (exception.retry); 6118 return err; 6119 } 6120 6121 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6122 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6123 size_t buflen) 6124 { 6125 struct nfs_server *server = NFS_SERVER(inode); 6126 struct nfs4_label label = {0, 0, buflen, buf}; 6127 6128 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6129 struct nfs_fattr fattr = { 6130 .label = &label, 6131 }; 6132 struct nfs4_getattr_arg arg = { 6133 .fh = NFS_FH(inode), 6134 .bitmask = bitmask, 6135 }; 6136 struct nfs4_getattr_res res = { 6137 .fattr = &fattr, 6138 .server = server, 6139 }; 6140 struct rpc_message msg = { 6141 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6142 .rpc_argp = &arg, 6143 .rpc_resp = &res, 6144 }; 6145 int ret; 6146 6147 nfs_fattr_init(&fattr); 6148 6149 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6150 if (ret) 6151 return ret; 6152 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6153 return -ENOENT; 6154 return label.len; 6155 } 6156 6157 static int nfs4_get_security_label(struct inode *inode, void *buf, 6158 size_t buflen) 6159 { 6160 struct nfs4_exception exception = { 6161 .interruptible = true, 6162 }; 6163 int err; 6164 6165 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6166 return -EOPNOTSUPP; 6167 6168 do { 6169 err = _nfs4_get_security_label(inode, buf, buflen); 6170 trace_nfs4_get_security_label(inode, err); 6171 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6172 &exception); 6173 } while (exception.retry); 6174 return err; 6175 } 6176 6177 static int _nfs4_do_set_security_label(struct inode *inode, 6178 struct nfs4_label *ilabel, 6179 struct nfs_fattr *fattr) 6180 { 6181 6182 struct iattr sattr = {0}; 6183 struct nfs_server *server = NFS_SERVER(inode); 6184 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6185 struct nfs_setattrargs arg = { 6186 .fh = NFS_FH(inode), 6187 .iap = &sattr, 6188 .server = server, 6189 .bitmask = bitmask, 6190 .label = ilabel, 6191 }; 6192 struct nfs_setattrres res = { 6193 .fattr = fattr, 6194 .server = server, 6195 }; 6196 struct rpc_message msg = { 6197 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6198 .rpc_argp = &arg, 6199 .rpc_resp = &res, 6200 }; 6201 int status; 6202 6203 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6204 6205 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6206 if (status) 6207 dprintk("%s failed: %d\n", __func__, status); 6208 6209 return status; 6210 } 6211 6212 static int nfs4_do_set_security_label(struct inode *inode, 6213 struct nfs4_label *ilabel, 6214 struct nfs_fattr *fattr) 6215 { 6216 struct nfs4_exception exception = { }; 6217 int err; 6218 6219 do { 6220 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6221 trace_nfs4_set_security_label(inode, err); 6222 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6223 &exception); 6224 } while (exception.retry); 6225 return err; 6226 } 6227 6228 static int 6229 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6230 { 6231 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6232 struct nfs_fattr *fattr; 6233 int status; 6234 6235 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6236 return -EOPNOTSUPP; 6237 6238 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6239 if (fattr == NULL) 6240 return -ENOMEM; 6241 6242 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6243 if (status == 0) 6244 nfs_setsecurity(inode, fattr); 6245 6246 return status; 6247 } 6248 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6249 6250 6251 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6252 nfs4_verifier *bootverf) 6253 { 6254 __be32 verf[2]; 6255 6256 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6257 /* An impossible timestamp guarantees this value 6258 * will never match a generated boot time. */ 6259 verf[0] = cpu_to_be32(U32_MAX); 6260 verf[1] = cpu_to_be32(U32_MAX); 6261 } else { 6262 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6263 u64 ns = ktime_to_ns(nn->boot_time); 6264 6265 verf[0] = cpu_to_be32(ns >> 32); 6266 verf[1] = cpu_to_be32(ns); 6267 } 6268 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6269 } 6270 6271 static size_t 6272 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6273 { 6274 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6275 struct nfs_netns_client *nn_clp = nn->nfs_client; 6276 const char *id; 6277 6278 buf[0] = '\0'; 6279 6280 if (nn_clp) { 6281 rcu_read_lock(); 6282 id = rcu_dereference(nn_clp->identifier); 6283 if (id) 6284 strscpy(buf, id, buflen); 6285 rcu_read_unlock(); 6286 } 6287 6288 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6289 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6290 6291 return strlen(buf); 6292 } 6293 6294 static int 6295 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6296 { 6297 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6298 size_t buflen; 6299 size_t len; 6300 char *str; 6301 6302 if (clp->cl_owner_id != NULL) 6303 return 0; 6304 6305 rcu_read_lock(); 6306 len = 14 + 6307 strlen(clp->cl_rpcclient->cl_nodename) + 6308 1 + 6309 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6310 1; 6311 rcu_read_unlock(); 6312 6313 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6314 if (buflen) 6315 len += buflen + 1; 6316 6317 if (len > NFS4_OPAQUE_LIMIT + 1) 6318 return -EINVAL; 6319 6320 /* 6321 * Since this string is allocated at mount time, and held until the 6322 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6323 * about a memory-reclaim deadlock. 6324 */ 6325 str = kmalloc(len, GFP_KERNEL); 6326 if (!str) 6327 return -ENOMEM; 6328 6329 rcu_read_lock(); 6330 if (buflen) 6331 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6332 clp->cl_rpcclient->cl_nodename, buf, 6333 rpc_peeraddr2str(clp->cl_rpcclient, 6334 RPC_DISPLAY_ADDR)); 6335 else 6336 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6337 clp->cl_rpcclient->cl_nodename, 6338 rpc_peeraddr2str(clp->cl_rpcclient, 6339 RPC_DISPLAY_ADDR)); 6340 rcu_read_unlock(); 6341 6342 clp->cl_owner_id = str; 6343 return 0; 6344 } 6345 6346 static int 6347 nfs4_init_uniform_client_string(struct nfs_client *clp) 6348 { 6349 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6350 size_t buflen; 6351 size_t len; 6352 char *str; 6353 6354 if (clp->cl_owner_id != NULL) 6355 return 0; 6356 6357 len = 10 + 10 + 1 + 10 + 1 + 6358 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6359 6360 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6361 if (buflen) 6362 len += buflen + 1; 6363 6364 if (len > NFS4_OPAQUE_LIMIT + 1) 6365 return -EINVAL; 6366 6367 /* 6368 * Since this string is allocated at mount time, and held until the 6369 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6370 * about a memory-reclaim deadlock. 6371 */ 6372 str = kmalloc(len, GFP_KERNEL); 6373 if (!str) 6374 return -ENOMEM; 6375 6376 if (buflen) 6377 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6378 clp->rpc_ops->version, clp->cl_minorversion, 6379 buf, clp->cl_rpcclient->cl_nodename); 6380 else 6381 scnprintf(str, len, "Linux NFSv%u.%u %s", 6382 clp->rpc_ops->version, clp->cl_minorversion, 6383 clp->cl_rpcclient->cl_nodename); 6384 clp->cl_owner_id = str; 6385 return 0; 6386 } 6387 6388 /* 6389 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6390 * services. Advertise one based on the address family of the 6391 * clientaddr. 6392 */ 6393 static unsigned int 6394 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6395 { 6396 if (strchr(clp->cl_ipaddr, ':') != NULL) 6397 return scnprintf(buf, len, "tcp6"); 6398 else 6399 return scnprintf(buf, len, "tcp"); 6400 } 6401 6402 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6403 { 6404 struct nfs4_setclientid *sc = calldata; 6405 6406 if (task->tk_status == 0) 6407 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6408 } 6409 6410 static const struct rpc_call_ops nfs4_setclientid_ops = { 6411 .rpc_call_done = nfs4_setclientid_done, 6412 }; 6413 6414 /** 6415 * nfs4_proc_setclientid - Negotiate client ID 6416 * @clp: state data structure 6417 * @program: RPC program for NFSv4 callback service 6418 * @port: IP port number for NFS4 callback service 6419 * @cred: credential to use for this call 6420 * @res: where to place the result 6421 * 6422 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6423 */ 6424 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6425 unsigned short port, const struct cred *cred, 6426 struct nfs4_setclientid_res *res) 6427 { 6428 nfs4_verifier sc_verifier; 6429 struct nfs4_setclientid setclientid = { 6430 .sc_verifier = &sc_verifier, 6431 .sc_prog = program, 6432 .sc_clnt = clp, 6433 }; 6434 struct rpc_message msg = { 6435 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6436 .rpc_argp = &setclientid, 6437 .rpc_resp = res, 6438 .rpc_cred = cred, 6439 }; 6440 struct rpc_task_setup task_setup_data = { 6441 .rpc_client = clp->cl_rpcclient, 6442 .rpc_message = &msg, 6443 .callback_ops = &nfs4_setclientid_ops, 6444 .callback_data = &setclientid, 6445 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6446 }; 6447 unsigned long now = jiffies; 6448 int status; 6449 6450 /* nfs_client_id4 */ 6451 nfs4_init_boot_verifier(clp, &sc_verifier); 6452 6453 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6454 status = nfs4_init_uniform_client_string(clp); 6455 else 6456 status = nfs4_init_nonuniform_client_string(clp); 6457 6458 if (status) 6459 goto out; 6460 6461 /* cb_client4 */ 6462 setclientid.sc_netid_len = 6463 nfs4_init_callback_netid(clp, 6464 setclientid.sc_netid, 6465 sizeof(setclientid.sc_netid)); 6466 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6467 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6468 clp->cl_ipaddr, port >> 8, port & 255); 6469 6470 dprintk("NFS call setclientid auth=%s, '%s'\n", 6471 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6472 clp->cl_owner_id); 6473 6474 status = nfs4_call_sync_custom(&task_setup_data); 6475 if (setclientid.sc_cred) { 6476 kfree(clp->cl_acceptor); 6477 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6478 put_rpccred(setclientid.sc_cred); 6479 } 6480 6481 if (status == 0) 6482 do_renew_lease(clp, now); 6483 out: 6484 trace_nfs4_setclientid(clp, status); 6485 dprintk("NFS reply setclientid: %d\n", status); 6486 return status; 6487 } 6488 6489 /** 6490 * nfs4_proc_setclientid_confirm - Confirm client ID 6491 * @clp: state data structure 6492 * @arg: result of a previous SETCLIENTID 6493 * @cred: credential to use for this call 6494 * 6495 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6496 */ 6497 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6498 struct nfs4_setclientid_res *arg, 6499 const struct cred *cred) 6500 { 6501 struct rpc_message msg = { 6502 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6503 .rpc_argp = arg, 6504 .rpc_cred = cred, 6505 }; 6506 int status; 6507 6508 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6509 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6510 clp->cl_clientid); 6511 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6512 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6513 trace_nfs4_setclientid_confirm(clp, status); 6514 dprintk("NFS reply setclientid_confirm: %d\n", status); 6515 return status; 6516 } 6517 6518 struct nfs4_delegreturndata { 6519 struct nfs4_delegreturnargs args; 6520 struct nfs4_delegreturnres res; 6521 struct nfs_fh fh; 6522 nfs4_stateid stateid; 6523 unsigned long timestamp; 6524 struct { 6525 struct nfs4_layoutreturn_args arg; 6526 struct nfs4_layoutreturn_res res; 6527 struct nfs4_xdr_opaque_data ld_private; 6528 u32 roc_barrier; 6529 bool roc; 6530 } lr; 6531 struct nfs_fattr fattr; 6532 int rpc_status; 6533 struct inode *inode; 6534 }; 6535 6536 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6537 { 6538 struct nfs4_delegreturndata *data = calldata; 6539 struct nfs4_exception exception = { 6540 .inode = data->inode, 6541 .stateid = &data->stateid, 6542 .task_is_privileged = data->args.seq_args.sa_privileged, 6543 }; 6544 6545 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6546 return; 6547 6548 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6549 6550 /* Handle Layoutreturn errors */ 6551 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6552 &data->res.lr_ret) == -EAGAIN) 6553 goto out_restart; 6554 6555 switch (task->tk_status) { 6556 case 0: 6557 renew_lease(data->res.server, data->timestamp); 6558 break; 6559 case -NFS4ERR_ADMIN_REVOKED: 6560 case -NFS4ERR_DELEG_REVOKED: 6561 case -NFS4ERR_EXPIRED: 6562 nfs4_free_revoked_stateid(data->res.server, 6563 data->args.stateid, 6564 task->tk_msg.rpc_cred); 6565 fallthrough; 6566 case -NFS4ERR_BAD_STATEID: 6567 case -NFS4ERR_STALE_STATEID: 6568 case -ETIMEDOUT: 6569 task->tk_status = 0; 6570 break; 6571 case -NFS4ERR_OLD_STATEID: 6572 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6573 nfs4_stateid_seqid_inc(&data->stateid); 6574 if (data->args.bitmask) { 6575 data->args.bitmask = NULL; 6576 data->res.fattr = NULL; 6577 } 6578 goto out_restart; 6579 case -NFS4ERR_ACCESS: 6580 if (data->args.bitmask) { 6581 data->args.bitmask = NULL; 6582 data->res.fattr = NULL; 6583 goto out_restart; 6584 } 6585 fallthrough; 6586 default: 6587 task->tk_status = nfs4_async_handle_exception(task, 6588 data->res.server, task->tk_status, 6589 &exception); 6590 if (exception.retry) 6591 goto out_restart; 6592 } 6593 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6594 data->rpc_status = task->tk_status; 6595 return; 6596 out_restart: 6597 task->tk_status = 0; 6598 rpc_restart_call_prepare(task); 6599 } 6600 6601 static void nfs4_delegreturn_release(void *calldata) 6602 { 6603 struct nfs4_delegreturndata *data = calldata; 6604 struct inode *inode = data->inode; 6605 6606 if (data->lr.roc) 6607 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6608 data->res.lr_ret); 6609 if (inode) { 6610 nfs4_fattr_set_prechange(&data->fattr, 6611 inode_peek_iversion_raw(inode)); 6612 nfs_refresh_inode(inode, &data->fattr); 6613 nfs_iput_and_deactive(inode); 6614 } 6615 kfree(calldata); 6616 } 6617 6618 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6619 { 6620 struct nfs4_delegreturndata *d_data; 6621 struct pnfs_layout_hdr *lo; 6622 6623 d_data = data; 6624 6625 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6626 nfs4_sequence_done(task, &d_data->res.seq_res); 6627 return; 6628 } 6629 6630 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6631 if (lo && !pnfs_layout_is_valid(lo)) { 6632 d_data->args.lr_args = NULL; 6633 d_data->res.lr_res = NULL; 6634 } 6635 6636 nfs4_setup_sequence(d_data->res.server->nfs_client, 6637 &d_data->args.seq_args, 6638 &d_data->res.seq_res, 6639 task); 6640 } 6641 6642 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6643 .rpc_call_prepare = nfs4_delegreturn_prepare, 6644 .rpc_call_done = nfs4_delegreturn_done, 6645 .rpc_release = nfs4_delegreturn_release, 6646 }; 6647 6648 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6649 { 6650 struct nfs4_delegreturndata *data; 6651 struct nfs_server *server = NFS_SERVER(inode); 6652 struct rpc_task *task; 6653 struct rpc_message msg = { 6654 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6655 .rpc_cred = cred, 6656 }; 6657 struct rpc_task_setup task_setup_data = { 6658 .rpc_client = server->client, 6659 .rpc_message = &msg, 6660 .callback_ops = &nfs4_delegreturn_ops, 6661 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6662 }; 6663 int status = 0; 6664 6665 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6666 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6667 6668 data = kzalloc(sizeof(*data), GFP_KERNEL); 6669 if (data == NULL) 6670 return -ENOMEM; 6671 6672 nfs4_state_protect(server->nfs_client, 6673 NFS_SP4_MACH_CRED_CLEANUP, 6674 &task_setup_data.rpc_client, &msg); 6675 6676 data->args.fhandle = &data->fh; 6677 data->args.stateid = &data->stateid; 6678 nfs4_bitmask_set(data->args.bitmask_store, 6679 server->cache_consistency_bitmask, inode, 0); 6680 data->args.bitmask = data->args.bitmask_store; 6681 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6682 nfs4_stateid_copy(&data->stateid, stateid); 6683 data->res.fattr = &data->fattr; 6684 data->res.server = server; 6685 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6686 data->lr.arg.ld_private = &data->lr.ld_private; 6687 nfs_fattr_init(data->res.fattr); 6688 data->timestamp = jiffies; 6689 data->rpc_status = 0; 6690 data->inode = nfs_igrab_and_active(inode); 6691 if (data->inode || issync) { 6692 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6693 cred); 6694 if (data->lr.roc) { 6695 data->args.lr_args = &data->lr.arg; 6696 data->res.lr_res = &data->lr.res; 6697 } 6698 } 6699 6700 if (!data->inode) 6701 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6702 1); 6703 else 6704 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6705 0); 6706 task_setup_data.callback_data = data; 6707 msg.rpc_argp = &data->args; 6708 msg.rpc_resp = &data->res; 6709 task = rpc_run_task(&task_setup_data); 6710 if (IS_ERR(task)) 6711 return PTR_ERR(task); 6712 if (!issync) 6713 goto out; 6714 status = rpc_wait_for_completion_task(task); 6715 if (status != 0) 6716 goto out; 6717 status = data->rpc_status; 6718 out: 6719 rpc_put_task(task); 6720 return status; 6721 } 6722 6723 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6724 { 6725 struct nfs_server *server = NFS_SERVER(inode); 6726 struct nfs4_exception exception = { }; 6727 int err; 6728 do { 6729 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6730 trace_nfs4_delegreturn(inode, stateid, err); 6731 switch (err) { 6732 case -NFS4ERR_STALE_STATEID: 6733 case -NFS4ERR_EXPIRED: 6734 case 0: 6735 return 0; 6736 } 6737 err = nfs4_handle_exception(server, err, &exception); 6738 } while (exception.retry); 6739 return err; 6740 } 6741 6742 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6743 { 6744 struct inode *inode = state->inode; 6745 struct nfs_server *server = NFS_SERVER(inode); 6746 struct nfs_client *clp = server->nfs_client; 6747 struct nfs_lockt_args arg = { 6748 .fh = NFS_FH(inode), 6749 .fl = request, 6750 }; 6751 struct nfs_lockt_res res = { 6752 .denied = request, 6753 }; 6754 struct rpc_message msg = { 6755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6756 .rpc_argp = &arg, 6757 .rpc_resp = &res, 6758 .rpc_cred = state->owner->so_cred, 6759 }; 6760 struct nfs4_lock_state *lsp; 6761 int status; 6762 6763 arg.lock_owner.clientid = clp->cl_clientid; 6764 status = nfs4_set_lock_state(state, request); 6765 if (status != 0) 6766 goto out; 6767 lsp = request->fl_u.nfs4_fl.owner; 6768 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6769 arg.lock_owner.s_dev = server->s_dev; 6770 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6771 switch (status) { 6772 case 0: 6773 request->fl_type = F_UNLCK; 6774 break; 6775 case -NFS4ERR_DENIED: 6776 status = 0; 6777 } 6778 request->fl_ops->fl_release_private(request); 6779 request->fl_ops = NULL; 6780 out: 6781 return status; 6782 } 6783 6784 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6785 { 6786 struct nfs4_exception exception = { 6787 .interruptible = true, 6788 }; 6789 int err; 6790 6791 do { 6792 err = _nfs4_proc_getlk(state, cmd, request); 6793 trace_nfs4_get_lock(request, state, cmd, err); 6794 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6795 &exception); 6796 } while (exception.retry); 6797 return err; 6798 } 6799 6800 /* 6801 * Update the seqid of a lock stateid after receiving 6802 * NFS4ERR_OLD_STATEID 6803 */ 6804 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6805 struct nfs4_lock_state *lsp) 6806 { 6807 struct nfs4_state *state = lsp->ls_state; 6808 bool ret = false; 6809 6810 spin_lock(&state->state_lock); 6811 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6812 goto out; 6813 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6814 nfs4_stateid_seqid_inc(dst); 6815 else 6816 dst->seqid = lsp->ls_stateid.seqid; 6817 ret = true; 6818 out: 6819 spin_unlock(&state->state_lock); 6820 return ret; 6821 } 6822 6823 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6824 struct nfs4_lock_state *lsp) 6825 { 6826 struct nfs4_state *state = lsp->ls_state; 6827 bool ret; 6828 6829 spin_lock(&state->state_lock); 6830 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6831 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6832 spin_unlock(&state->state_lock); 6833 return ret; 6834 } 6835 6836 struct nfs4_unlockdata { 6837 struct nfs_locku_args arg; 6838 struct nfs_locku_res res; 6839 struct nfs4_lock_state *lsp; 6840 struct nfs_open_context *ctx; 6841 struct nfs_lock_context *l_ctx; 6842 struct file_lock fl; 6843 struct nfs_server *server; 6844 unsigned long timestamp; 6845 }; 6846 6847 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6848 struct nfs_open_context *ctx, 6849 struct nfs4_lock_state *lsp, 6850 struct nfs_seqid *seqid) 6851 { 6852 struct nfs4_unlockdata *p; 6853 struct nfs4_state *state = lsp->ls_state; 6854 struct inode *inode = state->inode; 6855 6856 p = kzalloc(sizeof(*p), GFP_KERNEL); 6857 if (p == NULL) 6858 return NULL; 6859 p->arg.fh = NFS_FH(inode); 6860 p->arg.fl = &p->fl; 6861 p->arg.seqid = seqid; 6862 p->res.seqid = seqid; 6863 p->lsp = lsp; 6864 /* Ensure we don't close file until we're done freeing locks! */ 6865 p->ctx = get_nfs_open_context(ctx); 6866 p->l_ctx = nfs_get_lock_context(ctx); 6867 locks_init_lock(&p->fl); 6868 locks_copy_lock(&p->fl, fl); 6869 p->server = NFS_SERVER(inode); 6870 spin_lock(&state->state_lock); 6871 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6872 spin_unlock(&state->state_lock); 6873 return p; 6874 } 6875 6876 static void nfs4_locku_release_calldata(void *data) 6877 { 6878 struct nfs4_unlockdata *calldata = data; 6879 nfs_free_seqid(calldata->arg.seqid); 6880 nfs4_put_lock_state(calldata->lsp); 6881 nfs_put_lock_context(calldata->l_ctx); 6882 put_nfs_open_context(calldata->ctx); 6883 kfree(calldata); 6884 } 6885 6886 static void nfs4_locku_done(struct rpc_task *task, void *data) 6887 { 6888 struct nfs4_unlockdata *calldata = data; 6889 struct nfs4_exception exception = { 6890 .inode = calldata->lsp->ls_state->inode, 6891 .stateid = &calldata->arg.stateid, 6892 }; 6893 6894 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6895 return; 6896 switch (task->tk_status) { 6897 case 0: 6898 renew_lease(calldata->server, calldata->timestamp); 6899 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6900 if (nfs4_update_lock_stateid(calldata->lsp, 6901 &calldata->res.stateid)) 6902 break; 6903 fallthrough; 6904 case -NFS4ERR_ADMIN_REVOKED: 6905 case -NFS4ERR_EXPIRED: 6906 nfs4_free_revoked_stateid(calldata->server, 6907 &calldata->arg.stateid, 6908 task->tk_msg.rpc_cred); 6909 fallthrough; 6910 case -NFS4ERR_BAD_STATEID: 6911 case -NFS4ERR_STALE_STATEID: 6912 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6913 calldata->lsp)) 6914 rpc_restart_call_prepare(task); 6915 break; 6916 case -NFS4ERR_OLD_STATEID: 6917 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6918 calldata->lsp)) 6919 rpc_restart_call_prepare(task); 6920 break; 6921 default: 6922 task->tk_status = nfs4_async_handle_exception(task, 6923 calldata->server, task->tk_status, 6924 &exception); 6925 if (exception.retry) 6926 rpc_restart_call_prepare(task); 6927 } 6928 nfs_release_seqid(calldata->arg.seqid); 6929 } 6930 6931 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6932 { 6933 struct nfs4_unlockdata *calldata = data; 6934 6935 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6936 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6937 return; 6938 6939 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6940 goto out_wait; 6941 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6942 /* Note: exit _without_ running nfs4_locku_done */ 6943 goto out_no_action; 6944 } 6945 calldata->timestamp = jiffies; 6946 if (nfs4_setup_sequence(calldata->server->nfs_client, 6947 &calldata->arg.seq_args, 6948 &calldata->res.seq_res, 6949 task) != 0) 6950 nfs_release_seqid(calldata->arg.seqid); 6951 return; 6952 out_no_action: 6953 task->tk_action = NULL; 6954 out_wait: 6955 nfs4_sequence_done(task, &calldata->res.seq_res); 6956 } 6957 6958 static const struct rpc_call_ops nfs4_locku_ops = { 6959 .rpc_call_prepare = nfs4_locku_prepare, 6960 .rpc_call_done = nfs4_locku_done, 6961 .rpc_release = nfs4_locku_release_calldata, 6962 }; 6963 6964 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6965 struct nfs_open_context *ctx, 6966 struct nfs4_lock_state *lsp, 6967 struct nfs_seqid *seqid) 6968 { 6969 struct nfs4_unlockdata *data; 6970 struct rpc_message msg = { 6971 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6972 .rpc_cred = ctx->cred, 6973 }; 6974 struct rpc_task_setup task_setup_data = { 6975 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6976 .rpc_message = &msg, 6977 .callback_ops = &nfs4_locku_ops, 6978 .workqueue = nfsiod_workqueue, 6979 .flags = RPC_TASK_ASYNC, 6980 }; 6981 6982 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6983 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6984 6985 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6986 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6987 6988 /* Ensure this is an unlock - when canceling a lock, the 6989 * canceled lock is passed in, and it won't be an unlock. 6990 */ 6991 fl->fl_type = F_UNLCK; 6992 if (fl->fl_flags & FL_CLOSE) 6993 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6994 6995 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6996 if (data == NULL) { 6997 nfs_free_seqid(seqid); 6998 return ERR_PTR(-ENOMEM); 6999 } 7000 7001 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7002 msg.rpc_argp = &data->arg; 7003 msg.rpc_resp = &data->res; 7004 task_setup_data.callback_data = data; 7005 return rpc_run_task(&task_setup_data); 7006 } 7007 7008 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7009 { 7010 struct inode *inode = state->inode; 7011 struct nfs4_state_owner *sp = state->owner; 7012 struct nfs_inode *nfsi = NFS_I(inode); 7013 struct nfs_seqid *seqid; 7014 struct nfs4_lock_state *lsp; 7015 struct rpc_task *task; 7016 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7017 int status = 0; 7018 unsigned char fl_flags = request->fl_flags; 7019 7020 status = nfs4_set_lock_state(state, request); 7021 /* Unlock _before_ we do the RPC call */ 7022 request->fl_flags |= FL_EXISTS; 7023 /* Exclude nfs_delegation_claim_locks() */ 7024 mutex_lock(&sp->so_delegreturn_mutex); 7025 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7026 down_read(&nfsi->rwsem); 7027 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7028 up_read(&nfsi->rwsem); 7029 mutex_unlock(&sp->so_delegreturn_mutex); 7030 goto out; 7031 } 7032 lsp = request->fl_u.nfs4_fl.owner; 7033 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7034 up_read(&nfsi->rwsem); 7035 mutex_unlock(&sp->so_delegreturn_mutex); 7036 if (status != 0) 7037 goto out; 7038 /* Is this a delegated lock? */ 7039 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7040 goto out; 7041 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7042 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7043 status = -ENOMEM; 7044 if (IS_ERR(seqid)) 7045 goto out; 7046 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7047 status = PTR_ERR(task); 7048 if (IS_ERR(task)) 7049 goto out; 7050 status = rpc_wait_for_completion_task(task); 7051 rpc_put_task(task); 7052 out: 7053 request->fl_flags = fl_flags; 7054 trace_nfs4_unlock(request, state, F_SETLK, status); 7055 return status; 7056 } 7057 7058 struct nfs4_lockdata { 7059 struct nfs_lock_args arg; 7060 struct nfs_lock_res res; 7061 struct nfs4_lock_state *lsp; 7062 struct nfs_open_context *ctx; 7063 struct file_lock fl; 7064 unsigned long timestamp; 7065 int rpc_status; 7066 int cancelled; 7067 struct nfs_server *server; 7068 }; 7069 7070 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7071 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7072 gfp_t gfp_mask) 7073 { 7074 struct nfs4_lockdata *p; 7075 struct inode *inode = lsp->ls_state->inode; 7076 struct nfs_server *server = NFS_SERVER(inode); 7077 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7078 7079 p = kzalloc(sizeof(*p), gfp_mask); 7080 if (p == NULL) 7081 return NULL; 7082 7083 p->arg.fh = NFS_FH(inode); 7084 p->arg.fl = &p->fl; 7085 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7086 if (IS_ERR(p->arg.open_seqid)) 7087 goto out_free; 7088 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7089 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7090 if (IS_ERR(p->arg.lock_seqid)) 7091 goto out_free_seqid; 7092 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7093 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7094 p->arg.lock_owner.s_dev = server->s_dev; 7095 p->res.lock_seqid = p->arg.lock_seqid; 7096 p->lsp = lsp; 7097 p->server = server; 7098 p->ctx = get_nfs_open_context(ctx); 7099 locks_init_lock(&p->fl); 7100 locks_copy_lock(&p->fl, fl); 7101 return p; 7102 out_free_seqid: 7103 nfs_free_seqid(p->arg.open_seqid); 7104 out_free: 7105 kfree(p); 7106 return NULL; 7107 } 7108 7109 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7110 { 7111 struct nfs4_lockdata *data = calldata; 7112 struct nfs4_state *state = data->lsp->ls_state; 7113 7114 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7115 goto out_wait; 7116 /* Do we need to do an open_to_lock_owner? */ 7117 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7118 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7119 goto out_release_lock_seqid; 7120 } 7121 nfs4_stateid_copy(&data->arg.open_stateid, 7122 &state->open_stateid); 7123 data->arg.new_lock_owner = 1; 7124 data->res.open_seqid = data->arg.open_seqid; 7125 } else { 7126 data->arg.new_lock_owner = 0; 7127 nfs4_stateid_copy(&data->arg.lock_stateid, 7128 &data->lsp->ls_stateid); 7129 } 7130 if (!nfs4_valid_open_stateid(state)) { 7131 data->rpc_status = -EBADF; 7132 task->tk_action = NULL; 7133 goto out_release_open_seqid; 7134 } 7135 data->timestamp = jiffies; 7136 if (nfs4_setup_sequence(data->server->nfs_client, 7137 &data->arg.seq_args, 7138 &data->res.seq_res, 7139 task) == 0) 7140 return; 7141 out_release_open_seqid: 7142 nfs_release_seqid(data->arg.open_seqid); 7143 out_release_lock_seqid: 7144 nfs_release_seqid(data->arg.lock_seqid); 7145 out_wait: 7146 nfs4_sequence_done(task, &data->res.seq_res); 7147 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7148 } 7149 7150 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7151 { 7152 struct nfs4_lockdata *data = calldata; 7153 struct nfs4_lock_state *lsp = data->lsp; 7154 struct nfs_server *server = NFS_SERVER(d_inode(data->ctx->dentry)); 7155 7156 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7157 return; 7158 7159 data->rpc_status = task->tk_status; 7160 switch (task->tk_status) { 7161 case 0: 7162 renew_lease(server, data->timestamp); 7163 if (data->arg.new_lock && !data->cancelled) { 7164 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7165 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7166 goto out_restart; 7167 } 7168 if (data->arg.new_lock_owner != 0) { 7169 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7170 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7171 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7172 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7173 goto out_restart; 7174 break; 7175 case -NFS4ERR_BAD_STATEID: 7176 case -NFS4ERR_OLD_STATEID: 7177 case -NFS4ERR_STALE_STATEID: 7178 case -NFS4ERR_EXPIRED: 7179 if (data->arg.new_lock_owner != 0) { 7180 if (!nfs4_stateid_match(&data->arg.open_stateid, 7181 &lsp->ls_state->open_stateid)) 7182 goto out_restart; 7183 else if (nfs4_async_handle_error(task, server, lsp->ls_state, NULL) == -EAGAIN) 7184 goto out_restart; 7185 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7186 &lsp->ls_stateid)) 7187 goto out_restart; 7188 } 7189 out_done: 7190 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7191 return; 7192 out_restart: 7193 if (!data->cancelled) 7194 rpc_restart_call_prepare(task); 7195 goto out_done; 7196 } 7197 7198 static void nfs4_lock_release(void *calldata) 7199 { 7200 struct nfs4_lockdata *data = calldata; 7201 7202 nfs_free_seqid(data->arg.open_seqid); 7203 if (data->cancelled && data->rpc_status == 0) { 7204 struct rpc_task *task; 7205 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7206 data->arg.lock_seqid); 7207 if (!IS_ERR(task)) 7208 rpc_put_task_async(task); 7209 dprintk("%s: cancelling lock!\n", __func__); 7210 } else 7211 nfs_free_seqid(data->arg.lock_seqid); 7212 nfs4_put_lock_state(data->lsp); 7213 put_nfs_open_context(data->ctx); 7214 kfree(data); 7215 } 7216 7217 static const struct rpc_call_ops nfs4_lock_ops = { 7218 .rpc_call_prepare = nfs4_lock_prepare, 7219 .rpc_call_done = nfs4_lock_done, 7220 .rpc_release = nfs4_lock_release, 7221 }; 7222 7223 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7224 { 7225 switch (error) { 7226 case -NFS4ERR_ADMIN_REVOKED: 7227 case -NFS4ERR_EXPIRED: 7228 case -NFS4ERR_BAD_STATEID: 7229 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7230 if (new_lock_owner != 0 || 7231 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7232 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7233 break; 7234 case -NFS4ERR_STALE_STATEID: 7235 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7236 nfs4_schedule_lease_recovery(server->nfs_client); 7237 } 7238 } 7239 7240 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7241 { 7242 struct nfs4_lockdata *data; 7243 struct rpc_task *task; 7244 struct rpc_message msg = { 7245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7246 .rpc_cred = state->owner->so_cred, 7247 }; 7248 struct rpc_task_setup task_setup_data = { 7249 .rpc_client = NFS_CLIENT(state->inode), 7250 .rpc_message = &msg, 7251 .callback_ops = &nfs4_lock_ops, 7252 .workqueue = nfsiod_workqueue, 7253 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7254 }; 7255 int ret; 7256 7257 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7258 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7259 7260 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7261 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7262 if (data == NULL) 7263 return -ENOMEM; 7264 if (IS_SETLKW(cmd)) 7265 data->arg.block = 1; 7266 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7267 recovery_type > NFS_LOCK_NEW); 7268 msg.rpc_argp = &data->arg; 7269 msg.rpc_resp = &data->res; 7270 task_setup_data.callback_data = data; 7271 if (recovery_type > NFS_LOCK_NEW) { 7272 if (recovery_type == NFS_LOCK_RECLAIM) 7273 data->arg.reclaim = NFS_LOCK_RECLAIM; 7274 } else 7275 data->arg.new_lock = 1; 7276 task = rpc_run_task(&task_setup_data); 7277 if (IS_ERR(task)) 7278 return PTR_ERR(task); 7279 ret = rpc_wait_for_completion_task(task); 7280 if (ret == 0) { 7281 ret = data->rpc_status; 7282 if (ret) 7283 nfs4_handle_setlk_error(data->server, data->lsp, 7284 data->arg.new_lock_owner, ret); 7285 } else 7286 data->cancelled = true; 7287 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7288 rpc_put_task(task); 7289 dprintk("%s: ret = %d\n", __func__, ret); 7290 return ret; 7291 } 7292 7293 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7294 { 7295 struct nfs_server *server = NFS_SERVER(state->inode); 7296 struct nfs4_exception exception = { 7297 .inode = state->inode, 7298 }; 7299 int err; 7300 7301 do { 7302 /* Cache the lock if possible... */ 7303 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7304 return 0; 7305 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7306 if (err != -NFS4ERR_DELAY) 7307 break; 7308 nfs4_handle_exception(server, err, &exception); 7309 } while (exception.retry); 7310 return err; 7311 } 7312 7313 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7314 { 7315 struct nfs_server *server = NFS_SERVER(state->inode); 7316 struct nfs4_exception exception = { 7317 .inode = state->inode, 7318 }; 7319 int err; 7320 7321 err = nfs4_set_lock_state(state, request); 7322 if (err != 0) 7323 return err; 7324 if (!recover_lost_locks) { 7325 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7326 return 0; 7327 } 7328 do { 7329 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7330 return 0; 7331 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7332 switch (err) { 7333 default: 7334 goto out; 7335 case -NFS4ERR_GRACE: 7336 case -NFS4ERR_DELAY: 7337 nfs4_handle_exception(server, err, &exception); 7338 err = 0; 7339 } 7340 } while (exception.retry); 7341 out: 7342 return err; 7343 } 7344 7345 #if defined(CONFIG_NFS_V4_1) 7346 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7347 { 7348 struct nfs4_lock_state *lsp; 7349 int status; 7350 7351 status = nfs4_set_lock_state(state, request); 7352 if (status != 0) 7353 return status; 7354 lsp = request->fl_u.nfs4_fl.owner; 7355 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7356 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7357 return 0; 7358 return nfs4_lock_expired(state, request); 7359 } 7360 #endif 7361 7362 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7363 { 7364 struct nfs_inode *nfsi = NFS_I(state->inode); 7365 struct nfs4_state_owner *sp = state->owner; 7366 unsigned char fl_flags = request->fl_flags; 7367 int status; 7368 7369 request->fl_flags |= FL_ACCESS; 7370 status = locks_lock_inode_wait(state->inode, request); 7371 if (status < 0) 7372 goto out; 7373 mutex_lock(&sp->so_delegreturn_mutex); 7374 down_read(&nfsi->rwsem); 7375 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7376 /* Yes: cache locks! */ 7377 /* ...but avoid races with delegation recall... */ 7378 request->fl_flags = fl_flags & ~FL_SLEEP; 7379 status = locks_lock_inode_wait(state->inode, request); 7380 up_read(&nfsi->rwsem); 7381 mutex_unlock(&sp->so_delegreturn_mutex); 7382 goto out; 7383 } 7384 up_read(&nfsi->rwsem); 7385 mutex_unlock(&sp->so_delegreturn_mutex); 7386 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7387 out: 7388 request->fl_flags = fl_flags; 7389 return status; 7390 } 7391 7392 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7393 { 7394 struct nfs4_exception exception = { 7395 .state = state, 7396 .inode = state->inode, 7397 .interruptible = true, 7398 }; 7399 int err; 7400 7401 do { 7402 err = _nfs4_proc_setlk(state, cmd, request); 7403 if (err == -NFS4ERR_DENIED) 7404 err = -EAGAIN; 7405 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7406 err, &exception); 7407 } while (exception.retry); 7408 return err; 7409 } 7410 7411 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7412 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7413 7414 static int 7415 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7416 struct file_lock *request) 7417 { 7418 int status = -ERESTARTSYS; 7419 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7420 7421 while(!signalled()) { 7422 status = nfs4_proc_setlk(state, cmd, request); 7423 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7424 break; 7425 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7426 schedule_timeout(timeout); 7427 timeout *= 2; 7428 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7429 status = -ERESTARTSYS; 7430 } 7431 return status; 7432 } 7433 7434 #ifdef CONFIG_NFS_V4_1 7435 struct nfs4_lock_waiter { 7436 struct inode *inode; 7437 struct nfs_lowner owner; 7438 wait_queue_entry_t wait; 7439 }; 7440 7441 static int 7442 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7443 { 7444 struct nfs4_lock_waiter *waiter = 7445 container_of(wait, struct nfs4_lock_waiter, wait); 7446 7447 /* NULL key means to wake up everyone */ 7448 if (key) { 7449 struct cb_notify_lock_args *cbnl = key; 7450 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7451 *wowner = &waiter->owner; 7452 7453 /* Only wake if the callback was for the same owner. */ 7454 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7455 return 0; 7456 7457 /* Make sure it's for the right inode */ 7458 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7459 return 0; 7460 } 7461 7462 return woken_wake_function(wait, mode, flags, key); 7463 } 7464 7465 static int 7466 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7467 { 7468 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7469 struct nfs_server *server = NFS_SERVER(state->inode); 7470 struct nfs_client *clp = server->nfs_client; 7471 wait_queue_head_t *q = &clp->cl_lock_waitq; 7472 struct nfs4_lock_waiter waiter = { 7473 .inode = state->inode, 7474 .owner = { .clientid = clp->cl_clientid, 7475 .id = lsp->ls_seqid.owner_id, 7476 .s_dev = server->s_dev }, 7477 }; 7478 int status; 7479 7480 /* Don't bother with waitqueue if we don't expect a callback */ 7481 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7482 return nfs4_retry_setlk_simple(state, cmd, request); 7483 7484 init_wait(&waiter.wait); 7485 waiter.wait.func = nfs4_wake_lock_waiter; 7486 add_wait_queue(q, &waiter.wait); 7487 7488 do { 7489 status = nfs4_proc_setlk(state, cmd, request); 7490 if (status != -EAGAIN || IS_SETLK(cmd)) 7491 break; 7492 7493 status = -ERESTARTSYS; 7494 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7495 NFS4_LOCK_MAXTIMEOUT); 7496 } while (!signalled()); 7497 7498 remove_wait_queue(q, &waiter.wait); 7499 7500 return status; 7501 } 7502 #else /* !CONFIG_NFS_V4_1 */ 7503 static inline int 7504 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7505 { 7506 return nfs4_retry_setlk_simple(state, cmd, request); 7507 } 7508 #endif 7509 7510 static int 7511 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7512 { 7513 struct nfs_open_context *ctx; 7514 struct nfs4_state *state; 7515 int status; 7516 7517 /* verify open state */ 7518 ctx = nfs_file_open_context(filp); 7519 state = ctx->state; 7520 7521 if (IS_GETLK(cmd)) { 7522 if (state != NULL) 7523 return nfs4_proc_getlk(state, F_GETLK, request); 7524 return 0; 7525 } 7526 7527 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7528 return -EINVAL; 7529 7530 if (request->fl_type == F_UNLCK) { 7531 if (state != NULL) 7532 return nfs4_proc_unlck(state, cmd, request); 7533 return 0; 7534 } 7535 7536 if (state == NULL) 7537 return -ENOLCK; 7538 7539 if ((request->fl_flags & FL_POSIX) && 7540 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7541 return -ENOLCK; 7542 7543 /* 7544 * Don't rely on the VFS having checked the file open mode, 7545 * since it won't do this for flock() locks. 7546 */ 7547 switch (request->fl_type) { 7548 case F_RDLCK: 7549 if (!(filp->f_mode & FMODE_READ)) 7550 return -EBADF; 7551 break; 7552 case F_WRLCK: 7553 if (!(filp->f_mode & FMODE_WRITE)) 7554 return -EBADF; 7555 } 7556 7557 status = nfs4_set_lock_state(state, request); 7558 if (status != 0) 7559 return status; 7560 7561 return nfs4_retry_setlk(state, cmd, request); 7562 } 7563 7564 static int nfs4_delete_lease(struct file *file, void **priv) 7565 { 7566 return generic_setlease(file, F_UNLCK, NULL, priv); 7567 } 7568 7569 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease, 7570 void **priv) 7571 { 7572 struct inode *inode = file_inode(file); 7573 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7574 int ret; 7575 7576 /* No delegation, no lease */ 7577 if (!nfs4_have_delegation(inode, type)) 7578 return -EAGAIN; 7579 ret = generic_setlease(file, arg, lease, priv); 7580 if (ret || nfs4_have_delegation(inode, type)) 7581 return ret; 7582 /* We raced with a delegation return */ 7583 nfs4_delete_lease(file, priv); 7584 return -EAGAIN; 7585 } 7586 7587 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease, 7588 void **priv) 7589 { 7590 switch (arg) { 7591 case F_RDLCK: 7592 case F_WRLCK: 7593 return nfs4_add_lease(file, arg, lease, priv); 7594 case F_UNLCK: 7595 return nfs4_delete_lease(file, priv); 7596 default: 7597 return -EINVAL; 7598 } 7599 } 7600 7601 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7602 { 7603 struct nfs_server *server = NFS_SERVER(state->inode); 7604 int err; 7605 7606 err = nfs4_set_lock_state(state, fl); 7607 if (err != 0) 7608 return err; 7609 do { 7610 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7611 if (err != -NFS4ERR_DELAY) 7612 break; 7613 ssleep(1); 7614 } while (err == -NFS4ERR_DELAY); 7615 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7616 } 7617 7618 struct nfs_release_lockowner_data { 7619 struct nfs4_lock_state *lsp; 7620 struct nfs_server *server; 7621 struct nfs_release_lockowner_args args; 7622 struct nfs_release_lockowner_res res; 7623 unsigned long timestamp; 7624 }; 7625 7626 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7627 { 7628 struct nfs_release_lockowner_data *data = calldata; 7629 struct nfs_server *server = data->server; 7630 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7631 &data->res.seq_res, task); 7632 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7633 data->timestamp = jiffies; 7634 } 7635 7636 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7637 { 7638 struct nfs_release_lockowner_data *data = calldata; 7639 struct nfs_server *server = data->server; 7640 7641 nfs40_sequence_done(task, &data->res.seq_res); 7642 7643 switch (task->tk_status) { 7644 case 0: 7645 renew_lease(server, data->timestamp); 7646 break; 7647 case -NFS4ERR_STALE_CLIENTID: 7648 case -NFS4ERR_EXPIRED: 7649 nfs4_schedule_lease_recovery(server->nfs_client); 7650 break; 7651 case -NFS4ERR_LEASE_MOVED: 7652 case -NFS4ERR_DELAY: 7653 if (nfs4_async_handle_error(task, server, 7654 NULL, NULL) == -EAGAIN) 7655 rpc_restart_call_prepare(task); 7656 } 7657 } 7658 7659 static void nfs4_release_lockowner_release(void *calldata) 7660 { 7661 struct nfs_release_lockowner_data *data = calldata; 7662 nfs4_free_lock_state(data->server, data->lsp); 7663 kfree(calldata); 7664 } 7665 7666 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7667 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7668 .rpc_call_done = nfs4_release_lockowner_done, 7669 .rpc_release = nfs4_release_lockowner_release, 7670 }; 7671 7672 static void 7673 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7674 { 7675 struct nfs_release_lockowner_data *data; 7676 struct rpc_message msg = { 7677 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7678 }; 7679 7680 if (server->nfs_client->cl_mvops->minor_version != 0) 7681 return; 7682 7683 data = kmalloc(sizeof(*data), GFP_KERNEL); 7684 if (!data) 7685 return; 7686 data->lsp = lsp; 7687 data->server = server; 7688 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7689 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7690 data->args.lock_owner.s_dev = server->s_dev; 7691 7692 msg.rpc_argp = &data->args; 7693 msg.rpc_resp = &data->res; 7694 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7695 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7696 } 7697 7698 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7699 7700 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7701 struct mnt_idmap *idmap, 7702 struct dentry *unused, struct inode *inode, 7703 const char *key, const void *buf, 7704 size_t buflen, int flags) 7705 { 7706 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7707 } 7708 7709 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7710 struct dentry *unused, struct inode *inode, 7711 const char *key, void *buf, size_t buflen) 7712 { 7713 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7714 } 7715 7716 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7717 { 7718 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7719 } 7720 7721 #if defined(CONFIG_NFS_V4_1) 7722 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7723 7724 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7725 struct mnt_idmap *idmap, 7726 struct dentry *unused, struct inode *inode, 7727 const char *key, const void *buf, 7728 size_t buflen, int flags) 7729 { 7730 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7731 } 7732 7733 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7734 struct dentry *unused, struct inode *inode, 7735 const char *key, void *buf, size_t buflen) 7736 { 7737 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7738 } 7739 7740 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7741 { 7742 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7743 } 7744 7745 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7746 7747 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7748 struct mnt_idmap *idmap, 7749 struct dentry *unused, struct inode *inode, 7750 const char *key, const void *buf, 7751 size_t buflen, int flags) 7752 { 7753 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7754 } 7755 7756 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7757 struct dentry *unused, struct inode *inode, 7758 const char *key, void *buf, size_t buflen) 7759 { 7760 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7761 } 7762 7763 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7764 { 7765 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7766 } 7767 7768 #endif 7769 7770 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7771 7772 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7773 struct mnt_idmap *idmap, 7774 struct dentry *unused, struct inode *inode, 7775 const char *key, const void *buf, 7776 size_t buflen, int flags) 7777 { 7778 if (security_ismaclabel(key)) 7779 return nfs4_set_security_label(inode, buf, buflen); 7780 7781 return -EOPNOTSUPP; 7782 } 7783 7784 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7785 struct dentry *unused, struct inode *inode, 7786 const char *key, void *buf, size_t buflen) 7787 { 7788 if (security_ismaclabel(key)) 7789 return nfs4_get_security_label(inode, buf, buflen); 7790 return -EOPNOTSUPP; 7791 } 7792 7793 static ssize_t 7794 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7795 { 7796 int len = 0; 7797 7798 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7799 len = security_inode_listsecurity(inode, list, list_len); 7800 if (len >= 0 && list_len && len > list_len) 7801 return -ERANGE; 7802 } 7803 return len; 7804 } 7805 7806 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7807 .prefix = XATTR_SECURITY_PREFIX, 7808 .get = nfs4_xattr_get_nfs4_label, 7809 .set = nfs4_xattr_set_nfs4_label, 7810 }; 7811 7812 #else 7813 7814 static ssize_t 7815 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7816 { 7817 return 0; 7818 } 7819 7820 #endif 7821 7822 #ifdef CONFIG_NFS_V4_2 7823 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7824 struct mnt_idmap *idmap, 7825 struct dentry *unused, struct inode *inode, 7826 const char *key, const void *buf, 7827 size_t buflen, int flags) 7828 { 7829 u32 mask; 7830 int ret; 7831 7832 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7833 return -EOPNOTSUPP; 7834 7835 /* 7836 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7837 * flags right now. Handling of xattr operations use the normal 7838 * file read/write permissions. 7839 * 7840 * Just in case the server has other ideas (which RFC 8276 allows), 7841 * do a cached access check for the XA* flags to possibly avoid 7842 * doing an RPC and getting EACCES back. 7843 */ 7844 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7845 if (!(mask & NFS_ACCESS_XAWRITE)) 7846 return -EACCES; 7847 } 7848 7849 if (buf == NULL) { 7850 ret = nfs42_proc_removexattr(inode, key); 7851 if (!ret) 7852 nfs4_xattr_cache_remove(inode, key); 7853 } else { 7854 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7855 if (!ret) 7856 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7857 } 7858 7859 return ret; 7860 } 7861 7862 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7863 struct dentry *unused, struct inode *inode, 7864 const char *key, void *buf, size_t buflen) 7865 { 7866 u32 mask; 7867 ssize_t ret; 7868 7869 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7870 return -EOPNOTSUPP; 7871 7872 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7873 if (!(mask & NFS_ACCESS_XAREAD)) 7874 return -EACCES; 7875 } 7876 7877 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7878 if (ret) 7879 return ret; 7880 7881 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7882 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7883 return ret; 7884 7885 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7886 7887 return ret; 7888 } 7889 7890 static ssize_t 7891 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7892 { 7893 u64 cookie; 7894 bool eof; 7895 ssize_t ret, size; 7896 char *buf; 7897 size_t buflen; 7898 u32 mask; 7899 7900 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7901 return 0; 7902 7903 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7904 if (!(mask & NFS_ACCESS_XALIST)) 7905 return 0; 7906 } 7907 7908 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7909 if (ret) 7910 return ret; 7911 7912 ret = nfs4_xattr_cache_list(inode, list, list_len); 7913 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7914 return ret; 7915 7916 cookie = 0; 7917 eof = false; 7918 buflen = list_len ? list_len : XATTR_LIST_MAX; 7919 buf = list_len ? list : NULL; 7920 size = 0; 7921 7922 while (!eof) { 7923 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7924 &cookie, &eof); 7925 if (ret < 0) 7926 return ret; 7927 7928 if (list_len) { 7929 buf += ret; 7930 buflen -= ret; 7931 } 7932 size += ret; 7933 } 7934 7935 if (list_len) 7936 nfs4_xattr_cache_set_list(inode, list, size); 7937 7938 return size; 7939 } 7940 7941 #else 7942 7943 static ssize_t 7944 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7945 { 7946 return 0; 7947 } 7948 #endif /* CONFIG_NFS_V4_2 */ 7949 7950 /* 7951 * nfs_fhget will use either the mounted_on_fileid or the fileid 7952 */ 7953 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7954 { 7955 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7956 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7957 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7958 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7959 return; 7960 7961 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7962 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7963 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7964 fattr->nlink = 2; 7965 } 7966 7967 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7968 const struct qstr *name, 7969 struct nfs4_fs_locations *fs_locations, 7970 struct page *page) 7971 { 7972 struct nfs_server *server = NFS_SERVER(dir); 7973 u32 bitmask[3]; 7974 struct nfs4_fs_locations_arg args = { 7975 .dir_fh = NFS_FH(dir), 7976 .name = name, 7977 .page = page, 7978 .bitmask = bitmask, 7979 }; 7980 struct nfs4_fs_locations_res res = { 7981 .fs_locations = fs_locations, 7982 }; 7983 struct rpc_message msg = { 7984 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7985 .rpc_argp = &args, 7986 .rpc_resp = &res, 7987 }; 7988 int status; 7989 7990 dprintk("%s: start\n", __func__); 7991 7992 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7993 bitmask[1] = nfs4_fattr_bitmap[1]; 7994 7995 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7996 * is not supported */ 7997 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7998 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7999 else 8000 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8001 8002 nfs_fattr_init(fs_locations->fattr); 8003 fs_locations->server = server; 8004 fs_locations->nlocations = 0; 8005 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8006 dprintk("%s: returned status = %d\n", __func__, status); 8007 return status; 8008 } 8009 8010 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8011 const struct qstr *name, 8012 struct nfs4_fs_locations *fs_locations, 8013 struct page *page) 8014 { 8015 struct nfs4_exception exception = { 8016 .interruptible = true, 8017 }; 8018 int err; 8019 do { 8020 err = _nfs4_proc_fs_locations(client, dir, name, 8021 fs_locations, page); 8022 trace_nfs4_get_fs_locations(dir, name, err); 8023 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8024 &exception); 8025 } while (exception.retry); 8026 return err; 8027 } 8028 8029 /* 8030 * This operation also signals the server that this client is 8031 * performing migration recovery. The server can stop returning 8032 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8033 * appended to this compound to identify the client ID which is 8034 * performing recovery. 8035 */ 8036 static int _nfs40_proc_get_locations(struct nfs_server *server, 8037 struct nfs_fh *fhandle, 8038 struct nfs4_fs_locations *locations, 8039 struct page *page, const struct cred *cred) 8040 { 8041 struct rpc_clnt *clnt = server->client; 8042 u32 bitmask[2] = { 8043 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8044 }; 8045 struct nfs4_fs_locations_arg args = { 8046 .clientid = server->nfs_client->cl_clientid, 8047 .fh = fhandle, 8048 .page = page, 8049 .bitmask = bitmask, 8050 .migration = 1, /* skip LOOKUP */ 8051 .renew = 1, /* append RENEW */ 8052 }; 8053 struct nfs4_fs_locations_res res = { 8054 .fs_locations = locations, 8055 .migration = 1, 8056 .renew = 1, 8057 }; 8058 struct rpc_message msg = { 8059 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8060 .rpc_argp = &args, 8061 .rpc_resp = &res, 8062 .rpc_cred = cred, 8063 }; 8064 unsigned long now = jiffies; 8065 int status; 8066 8067 nfs_fattr_init(locations->fattr); 8068 locations->server = server; 8069 locations->nlocations = 0; 8070 8071 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8072 status = nfs4_call_sync_sequence(clnt, server, &msg, 8073 &args.seq_args, &res.seq_res); 8074 if (status) 8075 return status; 8076 8077 renew_lease(server, now); 8078 return 0; 8079 } 8080 8081 #ifdef CONFIG_NFS_V4_1 8082 8083 /* 8084 * This operation also signals the server that this client is 8085 * performing migration recovery. The server can stop asserting 8086 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8087 * performing this operation is identified in the SEQUENCE 8088 * operation in this compound. 8089 * 8090 * When the client supports GETATTR(fs_locations_info), it can 8091 * be plumbed in here. 8092 */ 8093 static int _nfs41_proc_get_locations(struct nfs_server *server, 8094 struct nfs_fh *fhandle, 8095 struct nfs4_fs_locations *locations, 8096 struct page *page, const struct cred *cred) 8097 { 8098 struct rpc_clnt *clnt = server->client; 8099 u32 bitmask[2] = { 8100 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8101 }; 8102 struct nfs4_fs_locations_arg args = { 8103 .fh = fhandle, 8104 .page = page, 8105 .bitmask = bitmask, 8106 .migration = 1, /* skip LOOKUP */ 8107 }; 8108 struct nfs4_fs_locations_res res = { 8109 .fs_locations = locations, 8110 .migration = 1, 8111 }; 8112 struct rpc_message msg = { 8113 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8114 .rpc_argp = &args, 8115 .rpc_resp = &res, 8116 .rpc_cred = cred, 8117 }; 8118 struct nfs4_call_sync_data data = { 8119 .seq_server = server, 8120 .seq_args = &args.seq_args, 8121 .seq_res = &res.seq_res, 8122 }; 8123 struct rpc_task_setup task_setup_data = { 8124 .rpc_client = clnt, 8125 .rpc_message = &msg, 8126 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8127 .callback_data = &data, 8128 .flags = RPC_TASK_NO_ROUND_ROBIN, 8129 }; 8130 int status; 8131 8132 nfs_fattr_init(locations->fattr); 8133 locations->server = server; 8134 locations->nlocations = 0; 8135 8136 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8137 status = nfs4_call_sync_custom(&task_setup_data); 8138 if (status == NFS4_OK && 8139 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8140 status = -NFS4ERR_LEASE_MOVED; 8141 return status; 8142 } 8143 8144 #endif /* CONFIG_NFS_V4_1 */ 8145 8146 /** 8147 * nfs4_proc_get_locations - discover locations for a migrated FSID 8148 * @server: pointer to nfs_server to process 8149 * @fhandle: pointer to the kernel NFS client file handle 8150 * @locations: result of query 8151 * @page: buffer 8152 * @cred: credential to use for this operation 8153 * 8154 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8155 * operation failed, or a negative errno if a local error occurred. 8156 * 8157 * On success, "locations" is filled in, but if the server has 8158 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8159 * asserted. 8160 * 8161 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8162 * from this client that require migration recovery. 8163 */ 8164 int nfs4_proc_get_locations(struct nfs_server *server, 8165 struct nfs_fh *fhandle, 8166 struct nfs4_fs_locations *locations, 8167 struct page *page, const struct cred *cred) 8168 { 8169 struct nfs_client *clp = server->nfs_client; 8170 const struct nfs4_mig_recovery_ops *ops = 8171 clp->cl_mvops->mig_recovery_ops; 8172 struct nfs4_exception exception = { 8173 .interruptible = true, 8174 }; 8175 int status; 8176 8177 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8178 (unsigned long long)server->fsid.major, 8179 (unsigned long long)server->fsid.minor, 8180 clp->cl_hostname); 8181 nfs_display_fhandle(fhandle, __func__); 8182 8183 do { 8184 status = ops->get_locations(server, fhandle, locations, page, 8185 cred); 8186 if (status != -NFS4ERR_DELAY) 8187 break; 8188 nfs4_handle_exception(server, status, &exception); 8189 } while (exception.retry); 8190 return status; 8191 } 8192 8193 /* 8194 * This operation also signals the server that this client is 8195 * performing "lease moved" recovery. The server can stop 8196 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8197 * is appended to this compound to identify the client ID which is 8198 * performing recovery. 8199 */ 8200 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8201 { 8202 struct nfs_server *server = NFS_SERVER(inode); 8203 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8204 struct rpc_clnt *clnt = server->client; 8205 struct nfs4_fsid_present_arg args = { 8206 .fh = NFS_FH(inode), 8207 .clientid = clp->cl_clientid, 8208 .renew = 1, /* append RENEW */ 8209 }; 8210 struct nfs4_fsid_present_res res = { 8211 .renew = 1, 8212 }; 8213 struct rpc_message msg = { 8214 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8215 .rpc_argp = &args, 8216 .rpc_resp = &res, 8217 .rpc_cred = cred, 8218 }; 8219 unsigned long now = jiffies; 8220 int status; 8221 8222 res.fh = nfs_alloc_fhandle(); 8223 if (res.fh == NULL) 8224 return -ENOMEM; 8225 8226 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8227 status = nfs4_call_sync_sequence(clnt, server, &msg, 8228 &args.seq_args, &res.seq_res); 8229 nfs_free_fhandle(res.fh); 8230 if (status) 8231 return status; 8232 8233 do_renew_lease(clp, now); 8234 return 0; 8235 } 8236 8237 #ifdef CONFIG_NFS_V4_1 8238 8239 /* 8240 * This operation also signals the server that this client is 8241 * performing "lease moved" recovery. The server can stop asserting 8242 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8243 * this operation is identified in the SEQUENCE operation in this 8244 * compound. 8245 */ 8246 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8247 { 8248 struct nfs_server *server = NFS_SERVER(inode); 8249 struct rpc_clnt *clnt = server->client; 8250 struct nfs4_fsid_present_arg args = { 8251 .fh = NFS_FH(inode), 8252 }; 8253 struct nfs4_fsid_present_res res = { 8254 }; 8255 struct rpc_message msg = { 8256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8257 .rpc_argp = &args, 8258 .rpc_resp = &res, 8259 .rpc_cred = cred, 8260 }; 8261 int status; 8262 8263 res.fh = nfs_alloc_fhandle(); 8264 if (res.fh == NULL) 8265 return -ENOMEM; 8266 8267 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8268 status = nfs4_call_sync_sequence(clnt, server, &msg, 8269 &args.seq_args, &res.seq_res); 8270 nfs_free_fhandle(res.fh); 8271 if (status == NFS4_OK && 8272 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8273 status = -NFS4ERR_LEASE_MOVED; 8274 return status; 8275 } 8276 8277 #endif /* CONFIG_NFS_V4_1 */ 8278 8279 /** 8280 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8281 * @inode: inode on FSID to check 8282 * @cred: credential to use for this operation 8283 * 8284 * Server indicates whether the FSID is present, moved, or not 8285 * recognized. This operation is necessary to clear a LEASE_MOVED 8286 * condition for this client ID. 8287 * 8288 * Returns NFS4_OK if the FSID is present on this server, 8289 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8290 * NFS4ERR code if some error occurred on the server, or a 8291 * negative errno if a local failure occurred. 8292 */ 8293 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8294 { 8295 struct nfs_server *server = NFS_SERVER(inode); 8296 struct nfs_client *clp = server->nfs_client; 8297 const struct nfs4_mig_recovery_ops *ops = 8298 clp->cl_mvops->mig_recovery_ops; 8299 struct nfs4_exception exception = { 8300 .interruptible = true, 8301 }; 8302 int status; 8303 8304 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8305 (unsigned long long)server->fsid.major, 8306 (unsigned long long)server->fsid.minor, 8307 clp->cl_hostname); 8308 nfs_display_fhandle(NFS_FH(inode), __func__); 8309 8310 do { 8311 status = ops->fsid_present(inode, cred); 8312 if (status != -NFS4ERR_DELAY) 8313 break; 8314 nfs4_handle_exception(server, status, &exception); 8315 } while (exception.retry); 8316 return status; 8317 } 8318 8319 /* 8320 * If 'use_integrity' is true and the state managment nfs_client 8321 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8322 * and the machine credential as per RFC3530bis and RFC5661 Security 8323 * Considerations sections. Otherwise, just use the user cred with the 8324 * filesystem's rpc_client. 8325 */ 8326 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8327 { 8328 int status; 8329 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8330 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8331 struct nfs4_secinfo_arg args = { 8332 .dir_fh = NFS_FH(dir), 8333 .name = name, 8334 }; 8335 struct nfs4_secinfo_res res = { 8336 .flavors = flavors, 8337 }; 8338 struct rpc_message msg = { 8339 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8340 .rpc_argp = &args, 8341 .rpc_resp = &res, 8342 }; 8343 struct nfs4_call_sync_data data = { 8344 .seq_server = NFS_SERVER(dir), 8345 .seq_args = &args.seq_args, 8346 .seq_res = &res.seq_res, 8347 }; 8348 struct rpc_task_setup task_setup = { 8349 .rpc_client = clnt, 8350 .rpc_message = &msg, 8351 .callback_ops = clp->cl_mvops->call_sync_ops, 8352 .callback_data = &data, 8353 .flags = RPC_TASK_NO_ROUND_ROBIN, 8354 }; 8355 const struct cred *cred = NULL; 8356 8357 if (use_integrity) { 8358 clnt = clp->cl_rpcclient; 8359 task_setup.rpc_client = clnt; 8360 8361 cred = nfs4_get_clid_cred(clp); 8362 msg.rpc_cred = cred; 8363 } 8364 8365 dprintk("NFS call secinfo %s\n", name->name); 8366 8367 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8368 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8369 status = nfs4_call_sync_custom(&task_setup); 8370 8371 dprintk("NFS reply secinfo: %d\n", status); 8372 8373 put_cred(cred); 8374 return status; 8375 } 8376 8377 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8378 struct nfs4_secinfo_flavors *flavors) 8379 { 8380 struct nfs4_exception exception = { 8381 .interruptible = true, 8382 }; 8383 int err; 8384 do { 8385 err = -NFS4ERR_WRONGSEC; 8386 8387 /* try to use integrity protection with machine cred */ 8388 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8389 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8390 8391 /* 8392 * if unable to use integrity protection, or SECINFO with 8393 * integrity protection returns NFS4ERR_WRONGSEC (which is 8394 * disallowed by spec, but exists in deployed servers) use 8395 * the current filesystem's rpc_client and the user cred. 8396 */ 8397 if (err == -NFS4ERR_WRONGSEC) 8398 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8399 8400 trace_nfs4_secinfo(dir, name, err); 8401 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8402 &exception); 8403 } while (exception.retry); 8404 return err; 8405 } 8406 8407 #ifdef CONFIG_NFS_V4_1 8408 /* 8409 * Check the exchange flags returned by the server for invalid flags, having 8410 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8411 * DS flags set. 8412 */ 8413 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8414 { 8415 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8416 goto out_inval; 8417 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8418 goto out_inval; 8419 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8420 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8421 goto out_inval; 8422 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8423 goto out_inval; 8424 return NFS_OK; 8425 out_inval: 8426 return -NFS4ERR_INVAL; 8427 } 8428 8429 static bool 8430 nfs41_same_server_scope(struct nfs41_server_scope *a, 8431 struct nfs41_server_scope *b) 8432 { 8433 if (a->server_scope_sz != b->server_scope_sz) 8434 return false; 8435 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8436 } 8437 8438 static void 8439 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8440 { 8441 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8442 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8443 struct nfs_client *clp = args->client; 8444 8445 switch (task->tk_status) { 8446 case -NFS4ERR_BADSESSION: 8447 case -NFS4ERR_DEADSESSION: 8448 nfs4_schedule_session_recovery(clp->cl_session, 8449 task->tk_status); 8450 return; 8451 } 8452 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8453 res->dir != NFS4_CDFS4_BOTH) { 8454 rpc_task_close_connection(task); 8455 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8456 rpc_restart_call(task); 8457 } 8458 } 8459 8460 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8461 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8462 }; 8463 8464 /* 8465 * nfs4_proc_bind_one_conn_to_session() 8466 * 8467 * The 4.1 client currently uses the same TCP connection for the 8468 * fore and backchannel. 8469 */ 8470 static 8471 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8472 struct rpc_xprt *xprt, 8473 struct nfs_client *clp, 8474 const struct cred *cred) 8475 { 8476 int status; 8477 struct nfs41_bind_conn_to_session_args args = { 8478 .client = clp, 8479 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8480 .retries = 0, 8481 }; 8482 struct nfs41_bind_conn_to_session_res res; 8483 struct rpc_message msg = { 8484 .rpc_proc = 8485 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8486 .rpc_argp = &args, 8487 .rpc_resp = &res, 8488 .rpc_cred = cred, 8489 }; 8490 struct rpc_task_setup task_setup_data = { 8491 .rpc_client = clnt, 8492 .rpc_xprt = xprt, 8493 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8494 .rpc_message = &msg, 8495 .flags = RPC_TASK_TIMEOUT, 8496 }; 8497 struct rpc_task *task; 8498 8499 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8500 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8501 args.dir = NFS4_CDFC4_FORE; 8502 8503 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8504 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8505 args.dir = NFS4_CDFC4_FORE; 8506 8507 task = rpc_run_task(&task_setup_data); 8508 if (!IS_ERR(task)) { 8509 status = task->tk_status; 8510 rpc_put_task(task); 8511 } else 8512 status = PTR_ERR(task); 8513 trace_nfs4_bind_conn_to_session(clp, status); 8514 if (status == 0) { 8515 if (memcmp(res.sessionid.data, 8516 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8517 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8518 return -EIO; 8519 } 8520 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8521 dprintk("NFS: %s: Unexpected direction from server\n", 8522 __func__); 8523 return -EIO; 8524 } 8525 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8526 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8527 __func__); 8528 return -EIO; 8529 } 8530 } 8531 8532 return status; 8533 } 8534 8535 struct rpc_bind_conn_calldata { 8536 struct nfs_client *clp; 8537 const struct cred *cred; 8538 }; 8539 8540 static int 8541 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8542 struct rpc_xprt *xprt, 8543 void *calldata) 8544 { 8545 struct rpc_bind_conn_calldata *p = calldata; 8546 8547 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8548 } 8549 8550 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8551 { 8552 struct rpc_bind_conn_calldata data = { 8553 .clp = clp, 8554 .cred = cred, 8555 }; 8556 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8557 nfs4_proc_bind_conn_to_session_callback, &data); 8558 } 8559 8560 /* 8561 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8562 * and operations we'd like to see to enable certain features in the allow map 8563 */ 8564 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8565 .how = SP4_MACH_CRED, 8566 .enforce.u.words = { 8567 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8568 1 << (OP_EXCHANGE_ID - 32) | 8569 1 << (OP_CREATE_SESSION - 32) | 8570 1 << (OP_DESTROY_SESSION - 32) | 8571 1 << (OP_DESTROY_CLIENTID - 32) 8572 }, 8573 .allow.u.words = { 8574 [0] = 1 << (OP_CLOSE) | 8575 1 << (OP_OPEN_DOWNGRADE) | 8576 1 << (OP_LOCKU) | 8577 1 << (OP_DELEGRETURN) | 8578 1 << (OP_COMMIT), 8579 [1] = 1 << (OP_SECINFO - 32) | 8580 1 << (OP_SECINFO_NO_NAME - 32) | 8581 1 << (OP_LAYOUTRETURN - 32) | 8582 1 << (OP_TEST_STATEID - 32) | 8583 1 << (OP_FREE_STATEID - 32) | 8584 1 << (OP_WRITE - 32) 8585 } 8586 }; 8587 8588 /* 8589 * Select the state protection mode for client `clp' given the server results 8590 * from exchange_id in `sp'. 8591 * 8592 * Returns 0 on success, negative errno otherwise. 8593 */ 8594 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8595 struct nfs41_state_protection *sp) 8596 { 8597 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8598 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8599 1 << (OP_EXCHANGE_ID - 32) | 8600 1 << (OP_CREATE_SESSION - 32) | 8601 1 << (OP_DESTROY_SESSION - 32) | 8602 1 << (OP_DESTROY_CLIENTID - 32) 8603 }; 8604 unsigned long flags = 0; 8605 unsigned int i; 8606 int ret = 0; 8607 8608 if (sp->how == SP4_MACH_CRED) { 8609 /* Print state protect result */ 8610 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8611 for (i = 0; i <= LAST_NFS4_OP; i++) { 8612 if (test_bit(i, sp->enforce.u.longs)) 8613 dfprintk(MOUNT, " enforce op %d\n", i); 8614 if (test_bit(i, sp->allow.u.longs)) 8615 dfprintk(MOUNT, " allow op %d\n", i); 8616 } 8617 8618 /* make sure nothing is on enforce list that isn't supported */ 8619 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8620 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8621 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8622 ret = -EINVAL; 8623 goto out; 8624 } 8625 } 8626 8627 /* 8628 * Minimal mode - state operations are allowed to use machine 8629 * credential. Note this already happens by default, so the 8630 * client doesn't have to do anything more than the negotiation. 8631 * 8632 * NOTE: we don't care if EXCHANGE_ID is in the list - 8633 * we're already using the machine cred for exchange_id 8634 * and will never use a different cred. 8635 */ 8636 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8637 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8638 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8639 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8640 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8641 dfprintk(MOUNT, " minimal mode enabled\n"); 8642 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8643 } else { 8644 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8645 ret = -EINVAL; 8646 goto out; 8647 } 8648 8649 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8650 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8651 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8652 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8653 dfprintk(MOUNT, " cleanup mode enabled\n"); 8654 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8655 } 8656 8657 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8658 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8659 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8660 } 8661 8662 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8663 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8664 dfprintk(MOUNT, " secinfo mode enabled\n"); 8665 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8666 } 8667 8668 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8669 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8670 dfprintk(MOUNT, " stateid mode enabled\n"); 8671 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8672 } 8673 8674 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8675 dfprintk(MOUNT, " write mode enabled\n"); 8676 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8677 } 8678 8679 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8680 dfprintk(MOUNT, " commit mode enabled\n"); 8681 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8682 } 8683 } 8684 out: 8685 clp->cl_sp4_flags = flags; 8686 return ret; 8687 } 8688 8689 struct nfs41_exchange_id_data { 8690 struct nfs41_exchange_id_res res; 8691 struct nfs41_exchange_id_args args; 8692 }; 8693 8694 static void nfs4_exchange_id_release(void *data) 8695 { 8696 struct nfs41_exchange_id_data *cdata = 8697 (struct nfs41_exchange_id_data *)data; 8698 8699 nfs_put_client(cdata->args.client); 8700 kfree(cdata->res.impl_id); 8701 kfree(cdata->res.server_scope); 8702 kfree(cdata->res.server_owner); 8703 kfree(cdata); 8704 } 8705 8706 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8707 .rpc_release = nfs4_exchange_id_release, 8708 }; 8709 8710 /* 8711 * _nfs4_proc_exchange_id() 8712 * 8713 * Wrapper for EXCHANGE_ID operation. 8714 */ 8715 static struct rpc_task * 8716 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8717 u32 sp4_how, struct rpc_xprt *xprt) 8718 { 8719 struct rpc_message msg = { 8720 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8721 .rpc_cred = cred, 8722 }; 8723 struct rpc_task_setup task_setup_data = { 8724 .rpc_client = clp->cl_rpcclient, 8725 .callback_ops = &nfs4_exchange_id_call_ops, 8726 .rpc_message = &msg, 8727 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8728 }; 8729 struct nfs41_exchange_id_data *calldata; 8730 int status; 8731 8732 if (!refcount_inc_not_zero(&clp->cl_count)) 8733 return ERR_PTR(-EIO); 8734 8735 status = -ENOMEM; 8736 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8737 if (!calldata) 8738 goto out; 8739 8740 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8741 8742 status = nfs4_init_uniform_client_string(clp); 8743 if (status) 8744 goto out_calldata; 8745 8746 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8747 GFP_NOFS); 8748 status = -ENOMEM; 8749 if (unlikely(calldata->res.server_owner == NULL)) 8750 goto out_calldata; 8751 8752 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8753 GFP_NOFS); 8754 if (unlikely(calldata->res.server_scope == NULL)) 8755 goto out_server_owner; 8756 8757 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8758 if (unlikely(calldata->res.impl_id == NULL)) 8759 goto out_server_scope; 8760 8761 switch (sp4_how) { 8762 case SP4_NONE: 8763 calldata->args.state_protect.how = SP4_NONE; 8764 break; 8765 8766 case SP4_MACH_CRED: 8767 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8768 break; 8769 8770 default: 8771 /* unsupported! */ 8772 WARN_ON_ONCE(1); 8773 status = -EINVAL; 8774 goto out_impl_id; 8775 } 8776 if (xprt) { 8777 task_setup_data.rpc_xprt = xprt; 8778 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8779 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8780 sizeof(calldata->args.verifier.data)); 8781 } 8782 calldata->args.client = clp; 8783 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8784 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8785 #ifdef CONFIG_NFS_V4_1_MIGRATION 8786 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8787 #endif 8788 msg.rpc_argp = &calldata->args; 8789 msg.rpc_resp = &calldata->res; 8790 task_setup_data.callback_data = calldata; 8791 8792 return rpc_run_task(&task_setup_data); 8793 8794 out_impl_id: 8795 kfree(calldata->res.impl_id); 8796 out_server_scope: 8797 kfree(calldata->res.server_scope); 8798 out_server_owner: 8799 kfree(calldata->res.server_owner); 8800 out_calldata: 8801 kfree(calldata); 8802 out: 8803 nfs_put_client(clp); 8804 return ERR_PTR(status); 8805 } 8806 8807 /* 8808 * _nfs4_proc_exchange_id() 8809 * 8810 * Wrapper for EXCHANGE_ID operation. 8811 */ 8812 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8813 u32 sp4_how) 8814 { 8815 struct rpc_task *task; 8816 struct nfs41_exchange_id_args *argp; 8817 struct nfs41_exchange_id_res *resp; 8818 unsigned long now = jiffies; 8819 int status; 8820 8821 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8822 if (IS_ERR(task)) 8823 return PTR_ERR(task); 8824 8825 argp = task->tk_msg.rpc_argp; 8826 resp = task->tk_msg.rpc_resp; 8827 status = task->tk_status; 8828 if (status != 0) 8829 goto out; 8830 8831 status = nfs4_check_cl_exchange_flags(resp->flags, 8832 clp->cl_mvops->minor_version); 8833 if (status != 0) 8834 goto out; 8835 8836 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8837 if (status != 0) 8838 goto out; 8839 8840 do_renew_lease(clp, now); 8841 8842 clp->cl_clientid = resp->clientid; 8843 clp->cl_exchange_flags = resp->flags; 8844 clp->cl_seqid = resp->seqid; 8845 /* Client ID is not confirmed */ 8846 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8847 clear_bit(NFS4_SESSION_ESTABLISHED, 8848 &clp->cl_session->session_state); 8849 8850 if (clp->cl_serverscope != NULL && 8851 !nfs41_same_server_scope(clp->cl_serverscope, 8852 resp->server_scope)) { 8853 dprintk("%s: server_scope mismatch detected\n", 8854 __func__); 8855 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8856 } 8857 8858 swap(clp->cl_serverowner, resp->server_owner); 8859 swap(clp->cl_serverscope, resp->server_scope); 8860 swap(clp->cl_implid, resp->impl_id); 8861 8862 /* Save the EXCHANGE_ID verifier session trunk tests */ 8863 memcpy(clp->cl_confirm.data, argp->verifier.data, 8864 sizeof(clp->cl_confirm.data)); 8865 out: 8866 trace_nfs4_exchange_id(clp, status); 8867 rpc_put_task(task); 8868 return status; 8869 } 8870 8871 /* 8872 * nfs4_proc_exchange_id() 8873 * 8874 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8875 * 8876 * Since the clientid has expired, all compounds using sessions 8877 * associated with the stale clientid will be returning 8878 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8879 * be in some phase of session reset. 8880 * 8881 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8882 */ 8883 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8884 { 8885 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8886 int status; 8887 8888 /* try SP4_MACH_CRED if krb5i/p */ 8889 if (authflavor == RPC_AUTH_GSS_KRB5I || 8890 authflavor == RPC_AUTH_GSS_KRB5P) { 8891 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8892 if (!status) 8893 return 0; 8894 } 8895 8896 /* try SP4_NONE */ 8897 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8898 } 8899 8900 /** 8901 * nfs4_test_session_trunk 8902 * 8903 * This is an add_xprt_test() test function called from 8904 * rpc_clnt_setup_test_and_add_xprt. 8905 * 8906 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8907 * and is dereferrenced in nfs4_exchange_id_release 8908 * 8909 * Upon success, add the new transport to the rpc_clnt 8910 * 8911 * @clnt: struct rpc_clnt to get new transport 8912 * @xprt: the rpc_xprt to test 8913 * @data: call data for _nfs4_proc_exchange_id. 8914 */ 8915 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8916 void *data) 8917 { 8918 struct nfs4_add_xprt_data *adata = data; 8919 struct rpc_task *task; 8920 int status; 8921 8922 u32 sp4_how; 8923 8924 dprintk("--> %s try %s\n", __func__, 8925 xprt->address_strings[RPC_DISPLAY_ADDR]); 8926 8927 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8928 8929 /* Test connection for session trunking. Async exchange_id call */ 8930 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8931 if (IS_ERR(task)) 8932 return; 8933 8934 status = task->tk_status; 8935 if (status == 0) 8936 status = nfs4_detect_session_trunking(adata->clp, 8937 task->tk_msg.rpc_resp, xprt); 8938 8939 if (status == 0) 8940 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8941 else if (rpc_clnt_xprt_switch_has_addr(clnt, 8942 (struct sockaddr *)&xprt->addr)) 8943 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8944 8945 rpc_put_task(task); 8946 } 8947 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8948 8949 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8950 const struct cred *cred) 8951 { 8952 struct rpc_message msg = { 8953 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8954 .rpc_argp = clp, 8955 .rpc_cred = cred, 8956 }; 8957 int status; 8958 8959 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8960 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8961 trace_nfs4_destroy_clientid(clp, status); 8962 if (status) 8963 dprintk("NFS: Got error %d from the server %s on " 8964 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8965 return status; 8966 } 8967 8968 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8969 const struct cred *cred) 8970 { 8971 unsigned int loop; 8972 int ret; 8973 8974 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8975 ret = _nfs4_proc_destroy_clientid(clp, cred); 8976 switch (ret) { 8977 case -NFS4ERR_DELAY: 8978 case -NFS4ERR_CLIENTID_BUSY: 8979 ssleep(1); 8980 break; 8981 default: 8982 return ret; 8983 } 8984 } 8985 return 0; 8986 } 8987 8988 int nfs4_destroy_clientid(struct nfs_client *clp) 8989 { 8990 const struct cred *cred; 8991 int ret = 0; 8992 8993 if (clp->cl_mvops->minor_version < 1) 8994 goto out; 8995 if (clp->cl_exchange_flags == 0) 8996 goto out; 8997 if (clp->cl_preserve_clid) 8998 goto out; 8999 cred = nfs4_get_clid_cred(clp); 9000 ret = nfs4_proc_destroy_clientid(clp, cred); 9001 put_cred(cred); 9002 switch (ret) { 9003 case 0: 9004 case -NFS4ERR_STALE_CLIENTID: 9005 clp->cl_exchange_flags = 0; 9006 } 9007 out: 9008 return ret; 9009 } 9010 9011 #endif /* CONFIG_NFS_V4_1 */ 9012 9013 struct nfs4_get_lease_time_data { 9014 struct nfs4_get_lease_time_args *args; 9015 struct nfs4_get_lease_time_res *res; 9016 struct nfs_client *clp; 9017 }; 9018 9019 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9020 void *calldata) 9021 { 9022 struct nfs4_get_lease_time_data *data = 9023 (struct nfs4_get_lease_time_data *)calldata; 9024 9025 /* just setup sequence, do not trigger session recovery 9026 since we're invoked within one */ 9027 nfs4_setup_sequence(data->clp, 9028 &data->args->la_seq_args, 9029 &data->res->lr_seq_res, 9030 task); 9031 } 9032 9033 /* 9034 * Called from nfs4_state_manager thread for session setup, so don't recover 9035 * from sequence operation or clientid errors. 9036 */ 9037 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9038 { 9039 struct nfs4_get_lease_time_data *data = 9040 (struct nfs4_get_lease_time_data *)calldata; 9041 9042 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9043 return; 9044 switch (task->tk_status) { 9045 case -NFS4ERR_DELAY: 9046 case -NFS4ERR_GRACE: 9047 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9048 task->tk_status = 0; 9049 fallthrough; 9050 case -NFS4ERR_RETRY_UNCACHED_REP: 9051 rpc_restart_call_prepare(task); 9052 return; 9053 } 9054 } 9055 9056 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9057 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9058 .rpc_call_done = nfs4_get_lease_time_done, 9059 }; 9060 9061 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9062 { 9063 struct nfs4_get_lease_time_args args; 9064 struct nfs4_get_lease_time_res res = { 9065 .lr_fsinfo = fsinfo, 9066 }; 9067 struct nfs4_get_lease_time_data data = { 9068 .args = &args, 9069 .res = &res, 9070 .clp = clp, 9071 }; 9072 struct rpc_message msg = { 9073 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9074 .rpc_argp = &args, 9075 .rpc_resp = &res, 9076 }; 9077 struct rpc_task_setup task_setup = { 9078 .rpc_client = clp->cl_rpcclient, 9079 .rpc_message = &msg, 9080 .callback_ops = &nfs4_get_lease_time_ops, 9081 .callback_data = &data, 9082 .flags = RPC_TASK_TIMEOUT, 9083 }; 9084 9085 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9086 return nfs4_call_sync_custom(&task_setup); 9087 } 9088 9089 #ifdef CONFIG_NFS_V4_1 9090 9091 /* 9092 * Initialize the values to be used by the client in CREATE_SESSION 9093 * If nfs4_init_session set the fore channel request and response sizes, 9094 * use them. 9095 * 9096 * Set the back channel max_resp_sz_cached to zero to force the client to 9097 * always set csa_cachethis to FALSE because the current implementation 9098 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9099 */ 9100 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9101 struct rpc_clnt *clnt) 9102 { 9103 unsigned int max_rqst_sz, max_resp_sz; 9104 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9105 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9106 9107 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9108 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9109 9110 /* Fore channel attributes */ 9111 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9112 args->fc_attrs.max_resp_sz = max_resp_sz; 9113 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9114 args->fc_attrs.max_reqs = max_session_slots; 9115 9116 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9117 "max_ops=%u max_reqs=%u\n", 9118 __func__, 9119 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9120 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9121 9122 /* Back channel attributes */ 9123 args->bc_attrs.max_rqst_sz = max_bc_payload; 9124 args->bc_attrs.max_resp_sz = max_bc_payload; 9125 args->bc_attrs.max_resp_sz_cached = 0; 9126 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9127 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9128 if (args->bc_attrs.max_reqs > max_bc_slots) 9129 args->bc_attrs.max_reqs = max_bc_slots; 9130 9131 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9132 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9133 __func__, 9134 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9135 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9136 args->bc_attrs.max_reqs); 9137 } 9138 9139 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9140 struct nfs41_create_session_res *res) 9141 { 9142 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9143 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9144 9145 if (rcvd->max_resp_sz > sent->max_resp_sz) 9146 return -EINVAL; 9147 /* 9148 * Our requested max_ops is the minimum we need; we're not 9149 * prepared to break up compounds into smaller pieces than that. 9150 * So, no point even trying to continue if the server won't 9151 * cooperate: 9152 */ 9153 if (rcvd->max_ops < sent->max_ops) 9154 return -EINVAL; 9155 if (rcvd->max_reqs == 0) 9156 return -EINVAL; 9157 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9158 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9159 return 0; 9160 } 9161 9162 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9163 struct nfs41_create_session_res *res) 9164 { 9165 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9166 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9167 9168 if (!(res->flags & SESSION4_BACK_CHAN)) 9169 goto out; 9170 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9171 return -EINVAL; 9172 if (rcvd->max_resp_sz < sent->max_resp_sz) 9173 return -EINVAL; 9174 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9175 return -EINVAL; 9176 if (rcvd->max_ops > sent->max_ops) 9177 return -EINVAL; 9178 if (rcvd->max_reqs > sent->max_reqs) 9179 return -EINVAL; 9180 out: 9181 return 0; 9182 } 9183 9184 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9185 struct nfs41_create_session_res *res) 9186 { 9187 int ret; 9188 9189 ret = nfs4_verify_fore_channel_attrs(args, res); 9190 if (ret) 9191 return ret; 9192 return nfs4_verify_back_channel_attrs(args, res); 9193 } 9194 9195 static void nfs4_update_session(struct nfs4_session *session, 9196 struct nfs41_create_session_res *res) 9197 { 9198 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9199 /* Mark client id and session as being confirmed */ 9200 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9201 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9202 session->flags = res->flags; 9203 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9204 if (res->flags & SESSION4_BACK_CHAN) 9205 memcpy(&session->bc_attrs, &res->bc_attrs, 9206 sizeof(session->bc_attrs)); 9207 } 9208 9209 static int _nfs4_proc_create_session(struct nfs_client *clp, 9210 const struct cred *cred) 9211 { 9212 struct nfs4_session *session = clp->cl_session; 9213 struct nfs41_create_session_args args = { 9214 .client = clp, 9215 .clientid = clp->cl_clientid, 9216 .seqid = clp->cl_seqid, 9217 .cb_program = NFS4_CALLBACK, 9218 }; 9219 struct nfs41_create_session_res res; 9220 9221 struct rpc_message msg = { 9222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9223 .rpc_argp = &args, 9224 .rpc_resp = &res, 9225 .rpc_cred = cred, 9226 }; 9227 int status; 9228 9229 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9230 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9231 9232 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9233 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9234 trace_nfs4_create_session(clp, status); 9235 9236 switch (status) { 9237 case -NFS4ERR_STALE_CLIENTID: 9238 case -NFS4ERR_DELAY: 9239 case -ETIMEDOUT: 9240 case -EACCES: 9241 case -EAGAIN: 9242 goto out; 9243 } 9244 9245 clp->cl_seqid++; 9246 if (!status) { 9247 /* Verify the session's negotiated channel_attrs values */ 9248 status = nfs4_verify_channel_attrs(&args, &res); 9249 /* Increment the clientid slot sequence id */ 9250 if (status) 9251 goto out; 9252 nfs4_update_session(session, &res); 9253 } 9254 out: 9255 return status; 9256 } 9257 9258 /* 9259 * Issues a CREATE_SESSION operation to the server. 9260 * It is the responsibility of the caller to verify the session is 9261 * expired before calling this routine. 9262 */ 9263 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9264 { 9265 int status; 9266 unsigned *ptr; 9267 struct nfs4_session *session = clp->cl_session; 9268 struct nfs4_add_xprt_data xprtdata = { 9269 .clp = clp, 9270 }; 9271 struct rpc_add_xprt_test rpcdata = { 9272 .add_xprt_test = clp->cl_mvops->session_trunk, 9273 .data = &xprtdata, 9274 }; 9275 9276 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9277 9278 status = _nfs4_proc_create_session(clp, cred); 9279 if (status) 9280 goto out; 9281 9282 /* Init or reset the session slot tables */ 9283 status = nfs4_setup_session_slot_tables(session); 9284 dprintk("slot table setup returned %d\n", status); 9285 if (status) 9286 goto out; 9287 9288 ptr = (unsigned *)&session->sess_id.data[0]; 9289 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9290 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9291 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9292 out: 9293 return status; 9294 } 9295 9296 /* 9297 * Issue the over-the-wire RPC DESTROY_SESSION. 9298 * The caller must serialize access to this routine. 9299 */ 9300 int nfs4_proc_destroy_session(struct nfs4_session *session, 9301 const struct cred *cred) 9302 { 9303 struct rpc_message msg = { 9304 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9305 .rpc_argp = session, 9306 .rpc_cred = cred, 9307 }; 9308 int status = 0; 9309 9310 /* session is still being setup */ 9311 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9312 return 0; 9313 9314 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9315 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9316 trace_nfs4_destroy_session(session->clp, status); 9317 9318 if (status) 9319 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9320 "Session has been destroyed regardless...\n", status); 9321 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9322 return status; 9323 } 9324 9325 /* 9326 * Renew the cl_session lease. 9327 */ 9328 struct nfs4_sequence_data { 9329 struct nfs_client *clp; 9330 struct nfs4_sequence_args args; 9331 struct nfs4_sequence_res res; 9332 }; 9333 9334 static void nfs41_sequence_release(void *data) 9335 { 9336 struct nfs4_sequence_data *calldata = data; 9337 struct nfs_client *clp = calldata->clp; 9338 9339 if (refcount_read(&clp->cl_count) > 1) 9340 nfs4_schedule_state_renewal(clp); 9341 nfs_put_client(clp); 9342 kfree(calldata); 9343 } 9344 9345 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9346 { 9347 switch(task->tk_status) { 9348 case -NFS4ERR_DELAY: 9349 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9350 return -EAGAIN; 9351 default: 9352 nfs4_schedule_lease_recovery(clp); 9353 } 9354 return 0; 9355 } 9356 9357 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9358 { 9359 struct nfs4_sequence_data *calldata = data; 9360 struct nfs_client *clp = calldata->clp; 9361 9362 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9363 return; 9364 9365 trace_nfs4_sequence(clp, task->tk_status); 9366 if (task->tk_status < 0) { 9367 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9368 if (refcount_read(&clp->cl_count) == 1) 9369 return; 9370 9371 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9372 rpc_restart_call_prepare(task); 9373 return; 9374 } 9375 } 9376 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9377 } 9378 9379 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9380 { 9381 struct nfs4_sequence_data *calldata = data; 9382 struct nfs_client *clp = calldata->clp; 9383 struct nfs4_sequence_args *args; 9384 struct nfs4_sequence_res *res; 9385 9386 args = task->tk_msg.rpc_argp; 9387 res = task->tk_msg.rpc_resp; 9388 9389 nfs4_setup_sequence(clp, args, res, task); 9390 } 9391 9392 static const struct rpc_call_ops nfs41_sequence_ops = { 9393 .rpc_call_done = nfs41_sequence_call_done, 9394 .rpc_call_prepare = nfs41_sequence_prepare, 9395 .rpc_release = nfs41_sequence_release, 9396 }; 9397 9398 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9399 const struct cred *cred, 9400 struct nfs4_slot *slot, 9401 bool is_privileged) 9402 { 9403 struct nfs4_sequence_data *calldata; 9404 struct rpc_message msg = { 9405 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9406 .rpc_cred = cred, 9407 }; 9408 struct rpc_task_setup task_setup_data = { 9409 .rpc_client = clp->cl_rpcclient, 9410 .rpc_message = &msg, 9411 .callback_ops = &nfs41_sequence_ops, 9412 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9413 }; 9414 struct rpc_task *ret; 9415 9416 ret = ERR_PTR(-EIO); 9417 if (!refcount_inc_not_zero(&clp->cl_count)) 9418 goto out_err; 9419 9420 ret = ERR_PTR(-ENOMEM); 9421 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9422 if (calldata == NULL) 9423 goto out_put_clp; 9424 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9425 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9426 msg.rpc_argp = &calldata->args; 9427 msg.rpc_resp = &calldata->res; 9428 calldata->clp = clp; 9429 task_setup_data.callback_data = calldata; 9430 9431 ret = rpc_run_task(&task_setup_data); 9432 if (IS_ERR(ret)) 9433 goto out_err; 9434 return ret; 9435 out_put_clp: 9436 nfs_put_client(clp); 9437 out_err: 9438 nfs41_release_slot(slot); 9439 return ret; 9440 } 9441 9442 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9443 { 9444 struct rpc_task *task; 9445 int ret = 0; 9446 9447 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9448 return -EAGAIN; 9449 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9450 if (IS_ERR(task)) 9451 ret = PTR_ERR(task); 9452 else 9453 rpc_put_task_async(task); 9454 dprintk("<-- %s status=%d\n", __func__, ret); 9455 return ret; 9456 } 9457 9458 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9459 { 9460 struct rpc_task *task; 9461 int ret; 9462 9463 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9464 if (IS_ERR(task)) { 9465 ret = PTR_ERR(task); 9466 goto out; 9467 } 9468 ret = rpc_wait_for_completion_task(task); 9469 if (!ret) 9470 ret = task->tk_status; 9471 rpc_put_task(task); 9472 out: 9473 dprintk("<-- %s status=%d\n", __func__, ret); 9474 return ret; 9475 } 9476 9477 struct nfs4_reclaim_complete_data { 9478 struct nfs_client *clp; 9479 struct nfs41_reclaim_complete_args arg; 9480 struct nfs41_reclaim_complete_res res; 9481 }; 9482 9483 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9484 { 9485 struct nfs4_reclaim_complete_data *calldata = data; 9486 9487 nfs4_setup_sequence(calldata->clp, 9488 &calldata->arg.seq_args, 9489 &calldata->res.seq_res, 9490 task); 9491 } 9492 9493 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9494 { 9495 switch(task->tk_status) { 9496 case 0: 9497 wake_up_all(&clp->cl_lock_waitq); 9498 fallthrough; 9499 case -NFS4ERR_COMPLETE_ALREADY: 9500 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9501 break; 9502 case -NFS4ERR_DELAY: 9503 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9504 fallthrough; 9505 case -NFS4ERR_RETRY_UNCACHED_REP: 9506 case -EACCES: 9507 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9508 __func__, task->tk_status, clp->cl_hostname); 9509 return -EAGAIN; 9510 case -NFS4ERR_BADSESSION: 9511 case -NFS4ERR_DEADSESSION: 9512 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9513 break; 9514 default: 9515 nfs4_schedule_lease_recovery(clp); 9516 } 9517 return 0; 9518 } 9519 9520 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9521 { 9522 struct nfs4_reclaim_complete_data *calldata = data; 9523 struct nfs_client *clp = calldata->clp; 9524 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9525 9526 if (!nfs41_sequence_done(task, res)) 9527 return; 9528 9529 trace_nfs4_reclaim_complete(clp, task->tk_status); 9530 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9531 rpc_restart_call_prepare(task); 9532 return; 9533 } 9534 } 9535 9536 static void nfs4_free_reclaim_complete_data(void *data) 9537 { 9538 struct nfs4_reclaim_complete_data *calldata = data; 9539 9540 kfree(calldata); 9541 } 9542 9543 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9544 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9545 .rpc_call_done = nfs4_reclaim_complete_done, 9546 .rpc_release = nfs4_free_reclaim_complete_data, 9547 }; 9548 9549 /* 9550 * Issue a global reclaim complete. 9551 */ 9552 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9553 const struct cred *cred) 9554 { 9555 struct nfs4_reclaim_complete_data *calldata; 9556 struct rpc_message msg = { 9557 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9558 .rpc_cred = cred, 9559 }; 9560 struct rpc_task_setup task_setup_data = { 9561 .rpc_client = clp->cl_rpcclient, 9562 .rpc_message = &msg, 9563 .callback_ops = &nfs4_reclaim_complete_call_ops, 9564 .flags = RPC_TASK_NO_ROUND_ROBIN, 9565 }; 9566 int status = -ENOMEM; 9567 9568 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9569 if (calldata == NULL) 9570 goto out; 9571 calldata->clp = clp; 9572 calldata->arg.one_fs = 0; 9573 9574 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9575 msg.rpc_argp = &calldata->arg; 9576 msg.rpc_resp = &calldata->res; 9577 task_setup_data.callback_data = calldata; 9578 status = nfs4_call_sync_custom(&task_setup_data); 9579 out: 9580 dprintk("<-- %s status=%d\n", __func__, status); 9581 return status; 9582 } 9583 9584 static void 9585 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9586 { 9587 struct nfs4_layoutget *lgp = calldata; 9588 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9589 9590 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9591 &lgp->res.seq_res, task); 9592 } 9593 9594 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9595 { 9596 struct nfs4_layoutget *lgp = calldata; 9597 9598 nfs41_sequence_process(task, &lgp->res.seq_res); 9599 } 9600 9601 static int 9602 nfs4_layoutget_handle_exception(struct rpc_task *task, 9603 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9604 { 9605 struct inode *inode = lgp->args.inode; 9606 struct nfs_server *server = NFS_SERVER(inode); 9607 struct pnfs_layout_hdr *lo = lgp->lo; 9608 int nfs4err = task->tk_status; 9609 int err, status = 0; 9610 LIST_HEAD(head); 9611 9612 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9613 9614 nfs4_sequence_free_slot(&lgp->res.seq_res); 9615 9616 switch (nfs4err) { 9617 case 0: 9618 goto out; 9619 9620 /* 9621 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9622 * on the file. set tk_status to -ENODATA to tell upper layer to 9623 * retry go inband. 9624 */ 9625 case -NFS4ERR_LAYOUTUNAVAILABLE: 9626 status = -ENODATA; 9627 goto out; 9628 /* 9629 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9630 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9631 */ 9632 case -NFS4ERR_BADLAYOUT: 9633 status = -EOVERFLOW; 9634 goto out; 9635 /* 9636 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9637 * (or clients) writing to the same RAID stripe except when 9638 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9639 * 9640 * Treat it like we would RECALLCONFLICT -- we retry for a little 9641 * while, and then eventually give up. 9642 */ 9643 case -NFS4ERR_LAYOUTTRYLATER: 9644 if (lgp->args.minlength == 0) { 9645 status = -EOVERFLOW; 9646 goto out; 9647 } 9648 status = -EBUSY; 9649 break; 9650 case -NFS4ERR_RECALLCONFLICT: 9651 status = -ERECALLCONFLICT; 9652 break; 9653 case -NFS4ERR_DELEG_REVOKED: 9654 case -NFS4ERR_ADMIN_REVOKED: 9655 case -NFS4ERR_EXPIRED: 9656 case -NFS4ERR_BAD_STATEID: 9657 exception->timeout = 0; 9658 spin_lock(&inode->i_lock); 9659 /* If the open stateid was bad, then recover it. */ 9660 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9661 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9662 spin_unlock(&inode->i_lock); 9663 exception->state = lgp->args.ctx->state; 9664 exception->stateid = &lgp->args.stateid; 9665 break; 9666 } 9667 9668 /* 9669 * Mark the bad layout state as invalid, then retry 9670 */ 9671 pnfs_mark_layout_stateid_invalid(lo, &head); 9672 spin_unlock(&inode->i_lock); 9673 nfs_commit_inode(inode, 0); 9674 pnfs_free_lseg_list(&head); 9675 status = -EAGAIN; 9676 goto out; 9677 } 9678 9679 err = nfs4_handle_exception(server, nfs4err, exception); 9680 if (!status) { 9681 if (exception->retry) 9682 status = -EAGAIN; 9683 else 9684 status = err; 9685 } 9686 out: 9687 return status; 9688 } 9689 9690 size_t max_response_pages(struct nfs_server *server) 9691 { 9692 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9693 return nfs_page_array_len(0, max_resp_sz); 9694 } 9695 9696 static void nfs4_layoutget_release(void *calldata) 9697 { 9698 struct nfs4_layoutget *lgp = calldata; 9699 9700 nfs4_sequence_free_slot(&lgp->res.seq_res); 9701 pnfs_layoutget_free(lgp); 9702 } 9703 9704 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9705 .rpc_call_prepare = nfs4_layoutget_prepare, 9706 .rpc_call_done = nfs4_layoutget_done, 9707 .rpc_release = nfs4_layoutget_release, 9708 }; 9709 9710 struct pnfs_layout_segment * 9711 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9712 { 9713 struct inode *inode = lgp->args.inode; 9714 struct nfs_server *server = NFS_SERVER(inode); 9715 struct rpc_task *task; 9716 struct rpc_message msg = { 9717 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9718 .rpc_argp = &lgp->args, 9719 .rpc_resp = &lgp->res, 9720 .rpc_cred = lgp->cred, 9721 }; 9722 struct rpc_task_setup task_setup_data = { 9723 .rpc_client = server->client, 9724 .rpc_message = &msg, 9725 .callback_ops = &nfs4_layoutget_call_ops, 9726 .callback_data = lgp, 9727 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9728 RPC_TASK_MOVEABLE, 9729 }; 9730 struct pnfs_layout_segment *lseg = NULL; 9731 struct nfs4_exception exception = { 9732 .inode = inode, 9733 .timeout = *timeout, 9734 }; 9735 int status = 0; 9736 9737 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9738 9739 task = rpc_run_task(&task_setup_data); 9740 if (IS_ERR(task)) 9741 return ERR_CAST(task); 9742 9743 status = rpc_wait_for_completion_task(task); 9744 if (status != 0) 9745 goto out; 9746 9747 if (task->tk_status < 0) { 9748 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9749 *timeout = exception.timeout; 9750 } else if (lgp->res.layoutp->len == 0) { 9751 status = -EAGAIN; 9752 *timeout = nfs4_update_delay(&exception.timeout); 9753 } else 9754 lseg = pnfs_layout_process(lgp); 9755 out: 9756 trace_nfs4_layoutget(lgp->args.ctx, 9757 &lgp->args.range, 9758 &lgp->res.range, 9759 &lgp->res.stateid, 9760 status); 9761 9762 rpc_put_task(task); 9763 dprintk("<-- %s status=%d\n", __func__, status); 9764 if (status) 9765 return ERR_PTR(status); 9766 return lseg; 9767 } 9768 9769 static void 9770 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9771 { 9772 struct nfs4_layoutreturn *lrp = calldata; 9773 9774 nfs4_setup_sequence(lrp->clp, 9775 &lrp->args.seq_args, 9776 &lrp->res.seq_res, 9777 task); 9778 if (!pnfs_layout_is_valid(lrp->args.layout)) 9779 rpc_exit(task, 0); 9780 } 9781 9782 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9783 { 9784 struct nfs4_layoutreturn *lrp = calldata; 9785 struct nfs_server *server; 9786 9787 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9788 return; 9789 9790 /* 9791 * Was there an RPC level error? Assume the call succeeded, 9792 * and that we need to release the layout 9793 */ 9794 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9795 lrp->res.lrs_present = 0; 9796 return; 9797 } 9798 9799 server = NFS_SERVER(lrp->args.inode); 9800 switch (task->tk_status) { 9801 case -NFS4ERR_OLD_STATEID: 9802 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9803 &lrp->args.range, 9804 lrp->args.inode)) 9805 goto out_restart; 9806 fallthrough; 9807 default: 9808 task->tk_status = 0; 9809 fallthrough; 9810 case 0: 9811 break; 9812 case -NFS4ERR_DELAY: 9813 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9814 break; 9815 goto out_restart; 9816 } 9817 return; 9818 out_restart: 9819 task->tk_status = 0; 9820 nfs4_sequence_free_slot(&lrp->res.seq_res); 9821 rpc_restart_call_prepare(task); 9822 } 9823 9824 static void nfs4_layoutreturn_release(void *calldata) 9825 { 9826 struct nfs4_layoutreturn *lrp = calldata; 9827 struct pnfs_layout_hdr *lo = lrp->args.layout; 9828 9829 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9830 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9831 nfs4_sequence_free_slot(&lrp->res.seq_res); 9832 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9833 lrp->ld_private.ops->free(&lrp->ld_private); 9834 pnfs_put_layout_hdr(lrp->args.layout); 9835 nfs_iput_and_deactive(lrp->inode); 9836 put_cred(lrp->cred); 9837 kfree(calldata); 9838 } 9839 9840 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9841 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9842 .rpc_call_done = nfs4_layoutreturn_done, 9843 .rpc_release = nfs4_layoutreturn_release, 9844 }; 9845 9846 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9847 { 9848 struct rpc_task *task; 9849 struct rpc_message msg = { 9850 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9851 .rpc_argp = &lrp->args, 9852 .rpc_resp = &lrp->res, 9853 .rpc_cred = lrp->cred, 9854 }; 9855 struct rpc_task_setup task_setup_data = { 9856 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9857 .rpc_message = &msg, 9858 .callback_ops = &nfs4_layoutreturn_call_ops, 9859 .callback_data = lrp, 9860 .flags = RPC_TASK_MOVEABLE, 9861 }; 9862 int status = 0; 9863 9864 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9865 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9866 &task_setup_data.rpc_client, &msg); 9867 9868 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9869 if (!sync) { 9870 if (!lrp->inode) { 9871 nfs4_layoutreturn_release(lrp); 9872 return -EAGAIN; 9873 } 9874 task_setup_data.flags |= RPC_TASK_ASYNC; 9875 } 9876 if (!lrp->inode) 9877 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9878 1); 9879 else 9880 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9881 0); 9882 task = rpc_run_task(&task_setup_data); 9883 if (IS_ERR(task)) 9884 return PTR_ERR(task); 9885 if (sync) 9886 status = task->tk_status; 9887 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9888 dprintk("<-- %s status=%d\n", __func__, status); 9889 rpc_put_task(task); 9890 return status; 9891 } 9892 9893 static int 9894 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9895 struct pnfs_device *pdev, 9896 const struct cred *cred) 9897 { 9898 struct nfs4_getdeviceinfo_args args = { 9899 .pdev = pdev, 9900 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9901 NOTIFY_DEVICEID4_DELETE, 9902 }; 9903 struct nfs4_getdeviceinfo_res res = { 9904 .pdev = pdev, 9905 }; 9906 struct rpc_message msg = { 9907 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9908 .rpc_argp = &args, 9909 .rpc_resp = &res, 9910 .rpc_cred = cred, 9911 }; 9912 int status; 9913 9914 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9915 if (res.notification & ~args.notify_types) 9916 dprintk("%s: unsupported notification\n", __func__); 9917 if (res.notification != args.notify_types) 9918 pdev->nocache = 1; 9919 9920 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9921 9922 dprintk("<-- %s status=%d\n", __func__, status); 9923 9924 return status; 9925 } 9926 9927 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9928 struct pnfs_device *pdev, 9929 const struct cred *cred) 9930 { 9931 struct nfs4_exception exception = { }; 9932 int err; 9933 9934 do { 9935 err = nfs4_handle_exception(server, 9936 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9937 &exception); 9938 } while (exception.retry); 9939 return err; 9940 } 9941 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9942 9943 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9944 { 9945 struct nfs4_layoutcommit_data *data = calldata; 9946 struct nfs_server *server = NFS_SERVER(data->args.inode); 9947 9948 nfs4_setup_sequence(server->nfs_client, 9949 &data->args.seq_args, 9950 &data->res.seq_res, 9951 task); 9952 } 9953 9954 static void 9955 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9956 { 9957 struct nfs4_layoutcommit_data *data = calldata; 9958 struct nfs_server *server = NFS_SERVER(data->args.inode); 9959 9960 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9961 return; 9962 9963 switch (task->tk_status) { /* Just ignore these failures */ 9964 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9965 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9966 case -NFS4ERR_BADLAYOUT: /* no layout */ 9967 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9968 task->tk_status = 0; 9969 break; 9970 case 0: 9971 break; 9972 default: 9973 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9974 rpc_restart_call_prepare(task); 9975 return; 9976 } 9977 } 9978 } 9979 9980 static void nfs4_layoutcommit_release(void *calldata) 9981 { 9982 struct nfs4_layoutcommit_data *data = calldata; 9983 9984 pnfs_cleanup_layoutcommit(data); 9985 nfs_post_op_update_inode_force_wcc(data->args.inode, 9986 data->res.fattr); 9987 put_cred(data->cred); 9988 nfs_iput_and_deactive(data->inode); 9989 kfree(data); 9990 } 9991 9992 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9993 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9994 .rpc_call_done = nfs4_layoutcommit_done, 9995 .rpc_release = nfs4_layoutcommit_release, 9996 }; 9997 9998 int 9999 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10000 { 10001 struct rpc_message msg = { 10002 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10003 .rpc_argp = &data->args, 10004 .rpc_resp = &data->res, 10005 .rpc_cred = data->cred, 10006 }; 10007 struct rpc_task_setup task_setup_data = { 10008 .task = &data->task, 10009 .rpc_client = NFS_CLIENT(data->args.inode), 10010 .rpc_message = &msg, 10011 .callback_ops = &nfs4_layoutcommit_ops, 10012 .callback_data = data, 10013 .flags = RPC_TASK_MOVEABLE, 10014 }; 10015 struct rpc_task *task; 10016 int status = 0; 10017 10018 dprintk("NFS: initiating layoutcommit call. sync %d " 10019 "lbw: %llu inode %lu\n", sync, 10020 data->args.lastbytewritten, 10021 data->args.inode->i_ino); 10022 10023 if (!sync) { 10024 data->inode = nfs_igrab_and_active(data->args.inode); 10025 if (data->inode == NULL) { 10026 nfs4_layoutcommit_release(data); 10027 return -EAGAIN; 10028 } 10029 task_setup_data.flags = RPC_TASK_ASYNC; 10030 } 10031 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10032 task = rpc_run_task(&task_setup_data); 10033 if (IS_ERR(task)) 10034 return PTR_ERR(task); 10035 if (sync) 10036 status = task->tk_status; 10037 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10038 dprintk("%s: status %d\n", __func__, status); 10039 rpc_put_task(task); 10040 return status; 10041 } 10042 10043 /* 10044 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10045 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10046 */ 10047 static int 10048 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10049 struct nfs_fsinfo *info, 10050 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10051 { 10052 struct nfs41_secinfo_no_name_args args = { 10053 .style = SECINFO_STYLE_CURRENT_FH, 10054 }; 10055 struct nfs4_secinfo_res res = { 10056 .flavors = flavors, 10057 }; 10058 struct rpc_message msg = { 10059 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10060 .rpc_argp = &args, 10061 .rpc_resp = &res, 10062 }; 10063 struct nfs4_call_sync_data data = { 10064 .seq_server = server, 10065 .seq_args = &args.seq_args, 10066 .seq_res = &res.seq_res, 10067 }; 10068 struct rpc_task_setup task_setup = { 10069 .rpc_client = server->client, 10070 .rpc_message = &msg, 10071 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10072 .callback_data = &data, 10073 .flags = RPC_TASK_NO_ROUND_ROBIN, 10074 }; 10075 const struct cred *cred = NULL; 10076 int status; 10077 10078 if (use_integrity) { 10079 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10080 10081 cred = nfs4_get_clid_cred(server->nfs_client); 10082 msg.rpc_cred = cred; 10083 } 10084 10085 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10086 status = nfs4_call_sync_custom(&task_setup); 10087 dprintk("<-- %s status=%d\n", __func__, status); 10088 10089 put_cred(cred); 10090 10091 return status; 10092 } 10093 10094 static int 10095 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10096 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10097 { 10098 struct nfs4_exception exception = { 10099 .interruptible = true, 10100 }; 10101 int err; 10102 do { 10103 /* first try using integrity protection */ 10104 err = -NFS4ERR_WRONGSEC; 10105 10106 /* try to use integrity protection with machine cred */ 10107 if (_nfs4_is_integrity_protected(server->nfs_client)) 10108 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10109 flavors, true); 10110 10111 /* 10112 * if unable to use integrity protection, or SECINFO with 10113 * integrity protection returns NFS4ERR_WRONGSEC (which is 10114 * disallowed by spec, but exists in deployed servers) use 10115 * the current filesystem's rpc_client and the user cred. 10116 */ 10117 if (err == -NFS4ERR_WRONGSEC) 10118 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10119 flavors, false); 10120 10121 switch (err) { 10122 case 0: 10123 case -NFS4ERR_WRONGSEC: 10124 case -ENOTSUPP: 10125 goto out; 10126 default: 10127 err = nfs4_handle_exception(server, err, &exception); 10128 } 10129 } while (exception.retry); 10130 out: 10131 return err; 10132 } 10133 10134 static int 10135 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10136 struct nfs_fsinfo *info) 10137 { 10138 int err; 10139 struct page *page; 10140 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10141 struct nfs4_secinfo_flavors *flavors; 10142 struct nfs4_secinfo4 *secinfo; 10143 int i; 10144 10145 page = alloc_page(GFP_KERNEL); 10146 if (!page) { 10147 err = -ENOMEM; 10148 goto out; 10149 } 10150 10151 flavors = page_address(page); 10152 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10153 10154 /* 10155 * Fall back on "guess and check" method if 10156 * the server doesn't support SECINFO_NO_NAME 10157 */ 10158 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10159 err = nfs4_find_root_sec(server, fhandle, info); 10160 goto out_freepage; 10161 } 10162 if (err) 10163 goto out_freepage; 10164 10165 for (i = 0; i < flavors->num_flavors; i++) { 10166 secinfo = &flavors->flavors[i]; 10167 10168 switch (secinfo->flavor) { 10169 case RPC_AUTH_NULL: 10170 case RPC_AUTH_UNIX: 10171 case RPC_AUTH_GSS: 10172 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10173 &secinfo->flavor_info); 10174 break; 10175 default: 10176 flavor = RPC_AUTH_MAXFLAVOR; 10177 break; 10178 } 10179 10180 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10181 flavor = RPC_AUTH_MAXFLAVOR; 10182 10183 if (flavor != RPC_AUTH_MAXFLAVOR) { 10184 err = nfs4_lookup_root_sec(server, fhandle, 10185 info, flavor); 10186 if (!err) 10187 break; 10188 } 10189 } 10190 10191 if (flavor == RPC_AUTH_MAXFLAVOR) 10192 err = -EPERM; 10193 10194 out_freepage: 10195 put_page(page); 10196 if (err == -EACCES) 10197 return -EPERM; 10198 out: 10199 return err; 10200 } 10201 10202 static int _nfs41_test_stateid(struct nfs_server *server, 10203 nfs4_stateid *stateid, 10204 const struct cred *cred) 10205 { 10206 int status; 10207 struct nfs41_test_stateid_args args = { 10208 .stateid = stateid, 10209 }; 10210 struct nfs41_test_stateid_res res; 10211 struct rpc_message msg = { 10212 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10213 .rpc_argp = &args, 10214 .rpc_resp = &res, 10215 .rpc_cred = cred, 10216 }; 10217 struct rpc_clnt *rpc_client = server->client; 10218 10219 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10220 &rpc_client, &msg); 10221 10222 dprintk("NFS call test_stateid %p\n", stateid); 10223 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10224 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10225 &args.seq_args, &res.seq_res); 10226 if (status != NFS_OK) { 10227 dprintk("NFS reply test_stateid: failed, %d\n", status); 10228 return status; 10229 } 10230 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10231 return -res.status; 10232 } 10233 10234 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10235 int err, struct nfs4_exception *exception) 10236 { 10237 exception->retry = 0; 10238 switch(err) { 10239 case -NFS4ERR_DELAY: 10240 case -NFS4ERR_RETRY_UNCACHED_REP: 10241 nfs4_handle_exception(server, err, exception); 10242 break; 10243 case -NFS4ERR_BADSESSION: 10244 case -NFS4ERR_BADSLOT: 10245 case -NFS4ERR_BAD_HIGH_SLOT: 10246 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10247 case -NFS4ERR_DEADSESSION: 10248 nfs4_do_handle_exception(server, err, exception); 10249 } 10250 } 10251 10252 /** 10253 * nfs41_test_stateid - perform a TEST_STATEID operation 10254 * 10255 * @server: server / transport on which to perform the operation 10256 * @stateid: state ID to test 10257 * @cred: credential 10258 * 10259 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10260 * Otherwise a negative NFS4ERR value is returned if the operation 10261 * failed or the state ID is not currently valid. 10262 */ 10263 static int nfs41_test_stateid(struct nfs_server *server, 10264 nfs4_stateid *stateid, 10265 const struct cred *cred) 10266 { 10267 struct nfs4_exception exception = { 10268 .interruptible = true, 10269 }; 10270 int err; 10271 do { 10272 err = _nfs41_test_stateid(server, stateid, cred); 10273 nfs4_handle_delay_or_session_error(server, err, &exception); 10274 } while (exception.retry); 10275 return err; 10276 } 10277 10278 struct nfs_free_stateid_data { 10279 struct nfs_server *server; 10280 struct nfs41_free_stateid_args args; 10281 struct nfs41_free_stateid_res res; 10282 }; 10283 10284 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10285 { 10286 struct nfs_free_stateid_data *data = calldata; 10287 nfs4_setup_sequence(data->server->nfs_client, 10288 &data->args.seq_args, 10289 &data->res.seq_res, 10290 task); 10291 } 10292 10293 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10294 { 10295 struct nfs_free_stateid_data *data = calldata; 10296 10297 nfs41_sequence_done(task, &data->res.seq_res); 10298 10299 switch (task->tk_status) { 10300 case -NFS4ERR_DELAY: 10301 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10302 rpc_restart_call_prepare(task); 10303 } 10304 } 10305 10306 static void nfs41_free_stateid_release(void *calldata) 10307 { 10308 struct nfs_free_stateid_data *data = calldata; 10309 struct nfs_client *clp = data->server->nfs_client; 10310 10311 nfs_put_client(clp); 10312 kfree(calldata); 10313 } 10314 10315 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10316 .rpc_call_prepare = nfs41_free_stateid_prepare, 10317 .rpc_call_done = nfs41_free_stateid_done, 10318 .rpc_release = nfs41_free_stateid_release, 10319 }; 10320 10321 /** 10322 * nfs41_free_stateid - perform a FREE_STATEID operation 10323 * 10324 * @server: server / transport on which to perform the operation 10325 * @stateid: state ID to release 10326 * @cred: credential 10327 * @privileged: set to true if this call needs to be privileged 10328 * 10329 * Note: this function is always asynchronous. 10330 */ 10331 static int nfs41_free_stateid(struct nfs_server *server, 10332 const nfs4_stateid *stateid, 10333 const struct cred *cred, 10334 bool privileged) 10335 { 10336 struct rpc_message msg = { 10337 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10338 .rpc_cred = cred, 10339 }; 10340 struct rpc_task_setup task_setup = { 10341 .rpc_client = server->client, 10342 .rpc_message = &msg, 10343 .callback_ops = &nfs41_free_stateid_ops, 10344 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10345 }; 10346 struct nfs_free_stateid_data *data; 10347 struct rpc_task *task; 10348 struct nfs_client *clp = server->nfs_client; 10349 10350 if (!refcount_inc_not_zero(&clp->cl_count)) 10351 return -EIO; 10352 10353 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10354 &task_setup.rpc_client, &msg); 10355 10356 dprintk("NFS call free_stateid %p\n", stateid); 10357 data = kmalloc(sizeof(*data), GFP_KERNEL); 10358 if (!data) 10359 return -ENOMEM; 10360 data->server = server; 10361 nfs4_stateid_copy(&data->args.stateid, stateid); 10362 10363 task_setup.callback_data = data; 10364 10365 msg.rpc_argp = &data->args; 10366 msg.rpc_resp = &data->res; 10367 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10368 task = rpc_run_task(&task_setup); 10369 if (IS_ERR(task)) 10370 return PTR_ERR(task); 10371 rpc_put_task(task); 10372 return 0; 10373 } 10374 10375 static void 10376 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10377 { 10378 const struct cred *cred = lsp->ls_state->owner->so_cred; 10379 10380 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10381 nfs4_free_lock_state(server, lsp); 10382 } 10383 10384 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10385 const nfs4_stateid *s2) 10386 { 10387 if (s1->type != s2->type) 10388 return false; 10389 10390 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10391 return false; 10392 10393 if (s1->seqid == s2->seqid) 10394 return true; 10395 10396 return s1->seqid == 0 || s2->seqid == 0; 10397 } 10398 10399 #endif /* CONFIG_NFS_V4_1 */ 10400 10401 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10402 const nfs4_stateid *s2) 10403 { 10404 return nfs4_stateid_match(s1, s2); 10405 } 10406 10407 10408 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10409 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10410 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10411 .recover_open = nfs4_open_reclaim, 10412 .recover_lock = nfs4_lock_reclaim, 10413 .establish_clid = nfs4_init_clientid, 10414 .detect_trunking = nfs40_discover_server_trunking, 10415 }; 10416 10417 #if defined(CONFIG_NFS_V4_1) 10418 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10419 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10420 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10421 .recover_open = nfs4_open_reclaim, 10422 .recover_lock = nfs4_lock_reclaim, 10423 .establish_clid = nfs41_init_clientid, 10424 .reclaim_complete = nfs41_proc_reclaim_complete, 10425 .detect_trunking = nfs41_discover_server_trunking, 10426 }; 10427 #endif /* CONFIG_NFS_V4_1 */ 10428 10429 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10430 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10431 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10432 .recover_open = nfs40_open_expired, 10433 .recover_lock = nfs4_lock_expired, 10434 .establish_clid = nfs4_init_clientid, 10435 }; 10436 10437 #if defined(CONFIG_NFS_V4_1) 10438 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10439 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10440 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10441 .recover_open = nfs41_open_expired, 10442 .recover_lock = nfs41_lock_expired, 10443 .establish_clid = nfs41_init_clientid, 10444 }; 10445 #endif /* CONFIG_NFS_V4_1 */ 10446 10447 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10448 .sched_state_renewal = nfs4_proc_async_renew, 10449 .get_state_renewal_cred = nfs4_get_renew_cred, 10450 .renew_lease = nfs4_proc_renew, 10451 }; 10452 10453 #if defined(CONFIG_NFS_V4_1) 10454 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10455 .sched_state_renewal = nfs41_proc_async_sequence, 10456 .get_state_renewal_cred = nfs4_get_machine_cred, 10457 .renew_lease = nfs4_proc_sequence, 10458 }; 10459 #endif 10460 10461 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10462 .get_locations = _nfs40_proc_get_locations, 10463 .fsid_present = _nfs40_proc_fsid_present, 10464 }; 10465 10466 #if defined(CONFIG_NFS_V4_1) 10467 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10468 .get_locations = _nfs41_proc_get_locations, 10469 .fsid_present = _nfs41_proc_fsid_present, 10470 }; 10471 #endif /* CONFIG_NFS_V4_1 */ 10472 10473 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10474 .minor_version = 0, 10475 .init_caps = NFS_CAP_READDIRPLUS 10476 | NFS_CAP_ATOMIC_OPEN 10477 | NFS_CAP_POSIX_LOCK, 10478 .init_client = nfs40_init_client, 10479 .shutdown_client = nfs40_shutdown_client, 10480 .match_stateid = nfs4_match_stateid, 10481 .find_root_sec = nfs4_find_root_sec, 10482 .free_lock_state = nfs4_release_lockowner, 10483 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10484 .alloc_seqid = nfs_alloc_seqid, 10485 .call_sync_ops = &nfs40_call_sync_ops, 10486 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10487 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10488 .state_renewal_ops = &nfs40_state_renewal_ops, 10489 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10490 }; 10491 10492 #if defined(CONFIG_NFS_V4_1) 10493 static struct nfs_seqid * 10494 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10495 { 10496 return NULL; 10497 } 10498 10499 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10500 .minor_version = 1, 10501 .init_caps = NFS_CAP_READDIRPLUS 10502 | NFS_CAP_ATOMIC_OPEN 10503 | NFS_CAP_POSIX_LOCK 10504 | NFS_CAP_STATEID_NFSV41 10505 | NFS_CAP_ATOMIC_OPEN_V1 10506 | NFS_CAP_LGOPEN 10507 | NFS_CAP_MOVEABLE, 10508 .init_client = nfs41_init_client, 10509 .shutdown_client = nfs41_shutdown_client, 10510 .match_stateid = nfs41_match_stateid, 10511 .find_root_sec = nfs41_find_root_sec, 10512 .free_lock_state = nfs41_free_lock_state, 10513 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10514 .alloc_seqid = nfs_alloc_no_seqid, 10515 .session_trunk = nfs4_test_session_trunk, 10516 .call_sync_ops = &nfs41_call_sync_ops, 10517 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10518 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10519 .state_renewal_ops = &nfs41_state_renewal_ops, 10520 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10521 }; 10522 #endif 10523 10524 #if defined(CONFIG_NFS_V4_2) 10525 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10526 .minor_version = 2, 10527 .init_caps = NFS_CAP_READDIRPLUS 10528 | NFS_CAP_ATOMIC_OPEN 10529 | NFS_CAP_POSIX_LOCK 10530 | NFS_CAP_STATEID_NFSV41 10531 | NFS_CAP_ATOMIC_OPEN_V1 10532 | NFS_CAP_LGOPEN 10533 | NFS_CAP_ALLOCATE 10534 | NFS_CAP_COPY 10535 | NFS_CAP_OFFLOAD_CANCEL 10536 | NFS_CAP_COPY_NOTIFY 10537 | NFS_CAP_DEALLOCATE 10538 | NFS_CAP_SEEK 10539 | NFS_CAP_LAYOUTSTATS 10540 | NFS_CAP_CLONE 10541 | NFS_CAP_LAYOUTERROR 10542 | NFS_CAP_READ_PLUS 10543 | NFS_CAP_MOVEABLE, 10544 .init_client = nfs41_init_client, 10545 .shutdown_client = nfs41_shutdown_client, 10546 .match_stateid = nfs41_match_stateid, 10547 .find_root_sec = nfs41_find_root_sec, 10548 .free_lock_state = nfs41_free_lock_state, 10549 .call_sync_ops = &nfs41_call_sync_ops, 10550 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10551 .alloc_seqid = nfs_alloc_no_seqid, 10552 .session_trunk = nfs4_test_session_trunk, 10553 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10554 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10555 .state_renewal_ops = &nfs41_state_renewal_ops, 10556 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10557 }; 10558 #endif 10559 10560 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10561 [0] = &nfs_v4_0_minor_ops, 10562 #if defined(CONFIG_NFS_V4_1) 10563 [1] = &nfs_v4_1_minor_ops, 10564 #endif 10565 #if defined(CONFIG_NFS_V4_2) 10566 [2] = &nfs_v4_2_minor_ops, 10567 #endif 10568 }; 10569 10570 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10571 { 10572 ssize_t error, error2, error3; 10573 10574 error = generic_listxattr(dentry, list, size); 10575 if (error < 0) 10576 return error; 10577 if (list) { 10578 list += error; 10579 size -= error; 10580 } 10581 10582 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 10583 if (error2 < 0) 10584 return error2; 10585 10586 if (list) { 10587 list += error2; 10588 size -= error2; 10589 } 10590 10591 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size); 10592 if (error3 < 0) 10593 return error3; 10594 10595 return error + error2 + error3; 10596 } 10597 10598 static void nfs4_enable_swap(struct inode *inode) 10599 { 10600 /* The state manager thread must always be running. 10601 * It will notice the client is a swapper, and stay put. 10602 */ 10603 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10604 10605 nfs4_schedule_state_manager(clp); 10606 } 10607 10608 static void nfs4_disable_swap(struct inode *inode) 10609 { 10610 /* The state manager thread will now exit once it is 10611 * woken. 10612 */ 10613 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10614 10615 nfs4_schedule_state_manager(clp); 10616 } 10617 10618 static const struct inode_operations nfs4_dir_inode_operations = { 10619 .create = nfs_create, 10620 .lookup = nfs_lookup, 10621 .atomic_open = nfs_atomic_open, 10622 .link = nfs_link, 10623 .unlink = nfs_unlink, 10624 .symlink = nfs_symlink, 10625 .mkdir = nfs_mkdir, 10626 .rmdir = nfs_rmdir, 10627 .mknod = nfs_mknod, 10628 .rename = nfs_rename, 10629 .permission = nfs_permission, 10630 .getattr = nfs_getattr, 10631 .setattr = nfs_setattr, 10632 .listxattr = nfs4_listxattr, 10633 }; 10634 10635 static const struct inode_operations nfs4_file_inode_operations = { 10636 .permission = nfs_permission, 10637 .getattr = nfs_getattr, 10638 .setattr = nfs_setattr, 10639 .listxattr = nfs4_listxattr, 10640 }; 10641 10642 const struct nfs_rpc_ops nfs_v4_clientops = { 10643 .version = 4, /* protocol version */ 10644 .dentry_ops = &nfs4_dentry_operations, 10645 .dir_inode_ops = &nfs4_dir_inode_operations, 10646 .file_inode_ops = &nfs4_file_inode_operations, 10647 .file_ops = &nfs4_file_operations, 10648 .getroot = nfs4_proc_get_root, 10649 .submount = nfs4_submount, 10650 .try_get_tree = nfs4_try_get_tree, 10651 .getattr = nfs4_proc_getattr, 10652 .setattr = nfs4_proc_setattr, 10653 .lookup = nfs4_proc_lookup, 10654 .lookupp = nfs4_proc_lookupp, 10655 .access = nfs4_proc_access, 10656 .readlink = nfs4_proc_readlink, 10657 .create = nfs4_proc_create, 10658 .remove = nfs4_proc_remove, 10659 .unlink_setup = nfs4_proc_unlink_setup, 10660 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10661 .unlink_done = nfs4_proc_unlink_done, 10662 .rename_setup = nfs4_proc_rename_setup, 10663 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10664 .rename_done = nfs4_proc_rename_done, 10665 .link = nfs4_proc_link, 10666 .symlink = nfs4_proc_symlink, 10667 .mkdir = nfs4_proc_mkdir, 10668 .rmdir = nfs4_proc_rmdir, 10669 .readdir = nfs4_proc_readdir, 10670 .mknod = nfs4_proc_mknod, 10671 .statfs = nfs4_proc_statfs, 10672 .fsinfo = nfs4_proc_fsinfo, 10673 .pathconf = nfs4_proc_pathconf, 10674 .set_capabilities = nfs4_server_capabilities, 10675 .decode_dirent = nfs4_decode_dirent, 10676 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10677 .read_setup = nfs4_proc_read_setup, 10678 .read_done = nfs4_read_done, 10679 .write_setup = nfs4_proc_write_setup, 10680 .write_done = nfs4_write_done, 10681 .commit_setup = nfs4_proc_commit_setup, 10682 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10683 .commit_done = nfs4_commit_done, 10684 .lock = nfs4_proc_lock, 10685 .clear_acl_cache = nfs4_zap_acl_attr, 10686 .close_context = nfs4_close_context, 10687 .open_context = nfs4_atomic_open, 10688 .have_delegation = nfs4_have_delegation, 10689 .alloc_client = nfs4_alloc_client, 10690 .init_client = nfs4_init_client, 10691 .free_client = nfs4_free_client, 10692 .create_server = nfs4_create_server, 10693 .clone_server = nfs_clone_server, 10694 .discover_trunking = nfs4_discover_trunking, 10695 .enable_swap = nfs4_enable_swap, 10696 .disable_swap = nfs4_disable_swap, 10697 }; 10698 10699 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10700 .name = XATTR_NAME_NFSV4_ACL, 10701 .list = nfs4_xattr_list_nfs4_acl, 10702 .get = nfs4_xattr_get_nfs4_acl, 10703 .set = nfs4_xattr_set_nfs4_acl, 10704 }; 10705 10706 #if defined(CONFIG_NFS_V4_1) 10707 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10708 .name = XATTR_NAME_NFSV4_DACL, 10709 .list = nfs4_xattr_list_nfs4_dacl, 10710 .get = nfs4_xattr_get_nfs4_dacl, 10711 .set = nfs4_xattr_set_nfs4_dacl, 10712 }; 10713 10714 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10715 .name = XATTR_NAME_NFSV4_SACL, 10716 .list = nfs4_xattr_list_nfs4_sacl, 10717 .get = nfs4_xattr_get_nfs4_sacl, 10718 .set = nfs4_xattr_set_nfs4_sacl, 10719 }; 10720 #endif 10721 10722 #ifdef CONFIG_NFS_V4_2 10723 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10724 .prefix = XATTR_USER_PREFIX, 10725 .get = nfs4_xattr_get_nfs4_user, 10726 .set = nfs4_xattr_set_nfs4_user, 10727 }; 10728 #endif 10729 10730 const struct xattr_handler *nfs4_xattr_handlers[] = { 10731 &nfs4_xattr_nfs4_acl_handler, 10732 #if defined(CONFIG_NFS_V4_1) 10733 &nfs4_xattr_nfs4_dacl_handler, 10734 &nfs4_xattr_nfs4_sacl_handler, 10735 #endif 10736 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10737 &nfs4_xattr_nfs4_label_handler, 10738 #endif 10739 #ifdef CONFIG_NFS_V4_2 10740 &nfs4_xattr_nfs4_user_handler, 10741 #endif 10742 NULL 10743 }; 10744