1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "sysfs.h" 67 #include "nfs4idmap.h" 68 #include "nfs4session.h" 69 #include "fscache.h" 70 #include "nfs42.h" 71 72 #include "nfs4trace.h" 73 74 #define NFSDBG_FACILITY NFSDBG_PROC 75 76 #define NFS4_BITMASK_SZ 3 77 78 #define NFS4_POLL_RETRY_MIN (HZ/10) 79 #define NFS4_POLL_RETRY_MAX (15*HZ) 80 81 /* file attributes which can be mapped to nfs attributes */ 82 #define NFS4_VALID_ATTRS (ATTR_MODE \ 83 | ATTR_UID \ 84 | ATTR_GID \ 85 | ATTR_SIZE \ 86 | ATTR_ATIME \ 87 | ATTR_MTIME \ 88 | ATTR_CTIME \ 89 | ATTR_ATIME_SET \ 90 | ATTR_MTIME_SET) 91 92 struct nfs4_opendata; 93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 97 struct nfs_fattr *fattr, struct inode *inode); 98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 99 struct nfs_fattr *fattr, struct iattr *sattr, 100 struct nfs_open_context *ctx, struct nfs4_label *ilabel); 101 #ifdef CONFIG_NFS_V4_1 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 103 const struct cred *cred, 104 struct nfs4_slot *slot, 105 bool is_privileged); 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 107 const struct cred *); 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 109 const struct cred *, bool); 110 #endif 111 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 113 static inline struct nfs4_label * 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 115 struct iattr *sattr, struct nfs4_label *label) 116 { 117 int err; 118 119 if (label == NULL) 120 return NULL; 121 122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 123 return NULL; 124 125 label->lfs = 0; 126 label->pi = 0; 127 label->len = 0; 128 label->label = NULL; 129 130 err = security_dentry_init_security(dentry, sattr->ia_mode, 131 &dentry->d_name, NULL, 132 (void **)&label->label, &label->len); 133 if (err == 0) 134 return label; 135 136 return NULL; 137 } 138 static inline void 139 nfs4_label_release_security(struct nfs4_label *label) 140 { 141 if (label) 142 security_release_secctx(label->label, label->len); 143 } 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 145 { 146 if (label) 147 return server->attr_bitmask; 148 149 return server->attr_bitmask_nl; 150 } 151 #else 152 static inline struct nfs4_label * 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 154 struct iattr *sattr, struct nfs4_label *l) 155 { return NULL; } 156 static inline void 157 nfs4_label_release_security(struct nfs4_label *label) 158 { return; } 159 static inline u32 * 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 161 { return server->attr_bitmask; } 162 #endif 163 164 /* Prevent leaks of NFSv4 errors into userland */ 165 static int nfs4_map_errors(int err) 166 { 167 if (err >= -1000) 168 return err; 169 switch (err) { 170 case -NFS4ERR_RESOURCE: 171 case -NFS4ERR_LAYOUTTRYLATER: 172 case -NFS4ERR_RECALLCONFLICT: 173 case -NFS4ERR_RETURNCONFLICT: 174 return -EREMOTEIO; 175 case -NFS4ERR_WRONGSEC: 176 case -NFS4ERR_WRONG_CRED: 177 return -EPERM; 178 case -NFS4ERR_BADOWNER: 179 case -NFS4ERR_BADNAME: 180 return -EINVAL; 181 case -NFS4ERR_SHARE_DENIED: 182 return -EACCES; 183 case -NFS4ERR_MINOR_VERS_MISMATCH: 184 return -EPROTONOSUPPORT; 185 case -NFS4ERR_FILE_OPEN: 186 return -EBUSY; 187 case -NFS4ERR_NOT_SAME: 188 return -ENOTSYNC; 189 default: 190 dprintk("%s could not handle NFSv4 error %d\n", 191 __func__, -err); 192 break; 193 } 194 return -EIO; 195 } 196 197 /* 198 * This is our standard bitmap for GETATTR requests. 199 */ 200 const u32 nfs4_fattr_bitmap[3] = { 201 FATTR4_WORD0_TYPE 202 | FATTR4_WORD0_CHANGE 203 | FATTR4_WORD0_SIZE 204 | FATTR4_WORD0_FSID 205 | FATTR4_WORD0_FILEID, 206 FATTR4_WORD1_MODE 207 | FATTR4_WORD1_NUMLINKS 208 | FATTR4_WORD1_OWNER 209 | FATTR4_WORD1_OWNER_GROUP 210 | FATTR4_WORD1_RAWDEV 211 | FATTR4_WORD1_SPACE_USED 212 | FATTR4_WORD1_TIME_ACCESS 213 | FATTR4_WORD1_TIME_METADATA 214 | FATTR4_WORD1_TIME_MODIFY 215 | FATTR4_WORD1_MOUNTED_ON_FILEID, 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 217 FATTR4_WORD2_SECURITY_LABEL 218 #endif 219 }; 220 221 static const u32 nfs4_pnfs_open_bitmap[3] = { 222 FATTR4_WORD0_TYPE 223 | FATTR4_WORD0_CHANGE 224 | FATTR4_WORD0_SIZE 225 | FATTR4_WORD0_FSID 226 | FATTR4_WORD0_FILEID, 227 FATTR4_WORD1_MODE 228 | FATTR4_WORD1_NUMLINKS 229 | FATTR4_WORD1_OWNER 230 | FATTR4_WORD1_OWNER_GROUP 231 | FATTR4_WORD1_RAWDEV 232 | FATTR4_WORD1_SPACE_USED 233 | FATTR4_WORD1_TIME_ACCESS 234 | FATTR4_WORD1_TIME_METADATA 235 | FATTR4_WORD1_TIME_MODIFY, 236 FATTR4_WORD2_MDSTHRESHOLD 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 238 | FATTR4_WORD2_SECURITY_LABEL 239 #endif 240 }; 241 242 static const u32 nfs4_open_noattr_bitmap[3] = { 243 FATTR4_WORD0_TYPE 244 | FATTR4_WORD0_FILEID, 245 }; 246 247 const u32 nfs4_statfs_bitmap[3] = { 248 FATTR4_WORD0_FILES_AVAIL 249 | FATTR4_WORD0_FILES_FREE 250 | FATTR4_WORD0_FILES_TOTAL, 251 FATTR4_WORD1_SPACE_AVAIL 252 | FATTR4_WORD1_SPACE_FREE 253 | FATTR4_WORD1_SPACE_TOTAL 254 }; 255 256 const u32 nfs4_pathconf_bitmap[3] = { 257 FATTR4_WORD0_MAXLINK 258 | FATTR4_WORD0_MAXNAME, 259 0 260 }; 261 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 263 | FATTR4_WORD0_MAXREAD 264 | FATTR4_WORD0_MAXWRITE 265 | FATTR4_WORD0_LEASE_TIME, 266 FATTR4_WORD1_TIME_DELTA 267 | FATTR4_WORD1_FS_LAYOUT_TYPES, 268 FATTR4_WORD2_LAYOUT_BLKSIZE 269 | FATTR4_WORD2_CLONE_BLKSIZE 270 | FATTR4_WORD2_CHANGE_ATTR_TYPE 271 | FATTR4_WORD2_XATTR_SUPPORT 272 }; 273 274 const u32 nfs4_fs_locations_bitmap[3] = { 275 FATTR4_WORD0_CHANGE 276 | FATTR4_WORD0_SIZE 277 | FATTR4_WORD0_FSID 278 | FATTR4_WORD0_FILEID 279 | FATTR4_WORD0_FS_LOCATIONS, 280 FATTR4_WORD1_OWNER 281 | FATTR4_WORD1_OWNER_GROUP 282 | FATTR4_WORD1_RAWDEV 283 | FATTR4_WORD1_SPACE_USED 284 | FATTR4_WORD1_TIME_ACCESS 285 | FATTR4_WORD1_TIME_METADATA 286 | FATTR4_WORD1_TIME_MODIFY 287 | FATTR4_WORD1_MOUNTED_ON_FILEID, 288 }; 289 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 291 struct inode *inode, unsigned long flags) 292 { 293 unsigned long cache_validity; 294 295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 296 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 297 return; 298 299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 300 301 /* Remove the attributes over which we have full control */ 302 dst[1] &= ~FATTR4_WORD1_RAWDEV; 303 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 304 dst[0] &= ~FATTR4_WORD0_SIZE; 305 306 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 307 dst[0] &= ~FATTR4_WORD0_CHANGE; 308 309 if (!(cache_validity & NFS_INO_INVALID_MODE)) 310 dst[1] &= ~FATTR4_WORD1_MODE; 311 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 313 } 314 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 316 struct nfs4_readdir_arg *readdir) 317 { 318 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 319 __be32 *start, *p; 320 321 if (cookie > 2) { 322 readdir->cookie = cookie; 323 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 324 return; 325 } 326 327 readdir->cookie = 0; 328 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 329 if (cookie == 2) 330 return; 331 332 /* 333 * NFSv4 servers do not return entries for '.' and '..' 334 * Therefore, we fake these entries here. We let '.' 335 * have cookie 0 and '..' have cookie 1. Note that 336 * when talking to the server, we always send cookie 0 337 * instead of 1 or 2. 338 */ 339 start = p = kmap_atomic(*readdir->pages); 340 341 if (cookie == 0) { 342 *p++ = xdr_one; /* next */ 343 *p++ = xdr_zero; /* cookie, first word */ 344 *p++ = xdr_one; /* cookie, second word */ 345 *p++ = xdr_one; /* entry len */ 346 memcpy(p, ".\0\0\0", 4); /* entry */ 347 p++; 348 *p++ = xdr_one; /* bitmap length */ 349 *p++ = htonl(attrs); /* bitmap */ 350 *p++ = htonl(12); /* attribute buffer length */ 351 *p++ = htonl(NF4DIR); 352 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 353 } 354 355 *p++ = xdr_one; /* next */ 356 *p++ = xdr_zero; /* cookie, first word */ 357 *p++ = xdr_two; /* cookie, second word */ 358 *p++ = xdr_two; /* entry len */ 359 memcpy(p, "..\0\0", 4); /* entry */ 360 p++; 361 *p++ = xdr_one; /* bitmap length */ 362 *p++ = htonl(attrs); /* bitmap */ 363 *p++ = htonl(12); /* attribute buffer length */ 364 *p++ = htonl(NF4DIR); 365 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 366 367 readdir->pgbase = (char *)p - (char *)start; 368 readdir->count -= readdir->pgbase; 369 kunmap_atomic(start); 370 } 371 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 373 { 374 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 375 fattr->pre_change_attr = version; 376 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 377 } 378 } 379 380 static void nfs4_test_and_free_stateid(struct nfs_server *server, 381 nfs4_stateid *stateid, 382 const struct cred *cred) 383 { 384 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 385 386 ops->test_and_free_expired(server, stateid, cred); 387 } 388 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 390 nfs4_stateid *stateid, 391 const struct cred *cred) 392 { 393 stateid->type = NFS4_REVOKED_STATEID_TYPE; 394 nfs4_test_and_free_stateid(server, stateid, cred); 395 } 396 397 static void nfs4_free_revoked_stateid(struct nfs_server *server, 398 const nfs4_stateid *stateid, 399 const struct cred *cred) 400 { 401 nfs4_stateid tmp; 402 403 nfs4_stateid_copy(&tmp, stateid); 404 __nfs4_free_revoked_stateid(server, &tmp, cred); 405 } 406 407 static long nfs4_update_delay(long *timeout) 408 { 409 long ret; 410 if (!timeout) 411 return NFS4_POLL_RETRY_MAX; 412 if (*timeout <= 0) 413 *timeout = NFS4_POLL_RETRY_MIN; 414 if (*timeout > NFS4_POLL_RETRY_MAX) 415 *timeout = NFS4_POLL_RETRY_MAX; 416 ret = *timeout; 417 *timeout <<= 1; 418 return ret; 419 } 420 421 static int nfs4_delay_killable(long *timeout) 422 { 423 might_sleep(); 424 425 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 426 schedule_timeout(nfs4_update_delay(timeout)); 427 if (!__fatal_signal_pending(current)) 428 return 0; 429 return -EINTR; 430 } 431 432 static int nfs4_delay_interruptible(long *timeout) 433 { 434 might_sleep(); 435 436 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 437 schedule_timeout(nfs4_update_delay(timeout)); 438 if (!signal_pending(current)) 439 return 0; 440 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 441 } 442 443 static int nfs4_delay(long *timeout, bool interruptible) 444 { 445 if (interruptible) 446 return nfs4_delay_interruptible(timeout); 447 return nfs4_delay_killable(timeout); 448 } 449 450 static const nfs4_stateid * 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 452 { 453 if (!stateid) 454 return NULL; 455 switch (stateid->type) { 456 case NFS4_OPEN_STATEID_TYPE: 457 case NFS4_LOCK_STATEID_TYPE: 458 case NFS4_DELEGATION_STATEID_TYPE: 459 return stateid; 460 default: 461 break; 462 } 463 return NULL; 464 } 465 466 /* This is the error handling routine for processes that are allowed 467 * to sleep. 468 */ 469 static int nfs4_do_handle_exception(struct nfs_server *server, 470 int errorcode, struct nfs4_exception *exception) 471 { 472 struct nfs_client *clp = server->nfs_client; 473 struct nfs4_state *state = exception->state; 474 const nfs4_stateid *stateid; 475 struct inode *inode = exception->inode; 476 int ret = errorcode; 477 478 exception->delay = 0; 479 exception->recovering = 0; 480 exception->retry = 0; 481 482 stateid = nfs4_recoverable_stateid(exception->stateid); 483 if (stateid == NULL && state != NULL) 484 stateid = nfs4_recoverable_stateid(&state->stateid); 485 486 switch(errorcode) { 487 case 0: 488 return 0; 489 case -NFS4ERR_BADHANDLE: 490 case -ESTALE: 491 if (inode != NULL && S_ISREG(inode->i_mode)) 492 pnfs_destroy_layout(NFS_I(inode)); 493 break; 494 case -NFS4ERR_DELEG_REVOKED: 495 case -NFS4ERR_ADMIN_REVOKED: 496 case -NFS4ERR_EXPIRED: 497 case -NFS4ERR_BAD_STATEID: 498 case -NFS4ERR_PARTNER_NO_AUTH: 499 if (inode != NULL && stateid != NULL) { 500 nfs_inode_find_state_and_recover(inode, 501 stateid); 502 goto wait_on_recovery; 503 } 504 fallthrough; 505 case -NFS4ERR_OPENMODE: 506 if (inode) { 507 int err; 508 509 err = nfs_async_inode_return_delegation(inode, 510 stateid); 511 if (err == 0) 512 goto wait_on_recovery; 513 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 514 exception->retry = 1; 515 break; 516 } 517 } 518 if (state == NULL) 519 break; 520 ret = nfs4_schedule_stateid_recovery(server, state); 521 if (ret < 0) 522 break; 523 goto wait_on_recovery; 524 case -NFS4ERR_STALE_STATEID: 525 case -NFS4ERR_STALE_CLIENTID: 526 nfs4_schedule_lease_recovery(clp); 527 goto wait_on_recovery; 528 case -NFS4ERR_MOVED: 529 ret = nfs4_schedule_migration_recovery(server); 530 if (ret < 0) 531 break; 532 goto wait_on_recovery; 533 case -NFS4ERR_LEASE_MOVED: 534 nfs4_schedule_lease_moved_recovery(clp); 535 goto wait_on_recovery; 536 #if defined(CONFIG_NFS_V4_1) 537 case -NFS4ERR_BADSESSION: 538 case -NFS4ERR_BADSLOT: 539 case -NFS4ERR_BAD_HIGH_SLOT: 540 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 541 case -NFS4ERR_DEADSESSION: 542 case -NFS4ERR_SEQ_FALSE_RETRY: 543 case -NFS4ERR_SEQ_MISORDERED: 544 /* Handled in nfs41_sequence_process() */ 545 goto wait_on_recovery; 546 #endif /* defined(CONFIG_NFS_V4_1) */ 547 case -NFS4ERR_FILE_OPEN: 548 if (exception->timeout > HZ) { 549 /* We have retried a decent amount, time to 550 * fail 551 */ 552 ret = -EBUSY; 553 break; 554 } 555 fallthrough; 556 case -NFS4ERR_DELAY: 557 nfs_inc_server_stats(server, NFSIOS_DELAY); 558 fallthrough; 559 case -NFS4ERR_GRACE: 560 case -NFS4ERR_LAYOUTTRYLATER: 561 case -NFS4ERR_RECALLCONFLICT: 562 case -NFS4ERR_RETURNCONFLICT: 563 exception->delay = 1; 564 return 0; 565 566 case -NFS4ERR_RETRY_UNCACHED_REP: 567 case -NFS4ERR_OLD_STATEID: 568 exception->retry = 1; 569 break; 570 case -NFS4ERR_BADOWNER: 571 /* The following works around a Linux server bug! */ 572 case -NFS4ERR_BADNAME: 573 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 574 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 575 exception->retry = 1; 576 printk(KERN_WARNING "NFS: v4 server %s " 577 "does not accept raw " 578 "uid/gids. " 579 "Reenabling the idmapper.\n", 580 server->nfs_client->cl_hostname); 581 } 582 } 583 /* We failed to handle the error */ 584 return nfs4_map_errors(ret); 585 wait_on_recovery: 586 exception->recovering = 1; 587 return 0; 588 } 589 590 /* This is the error handling routine for processes that are allowed 591 * to sleep. 592 */ 593 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 594 { 595 struct nfs_client *clp = server->nfs_client; 596 int ret; 597 598 ret = nfs4_do_handle_exception(server, errorcode, exception); 599 if (exception->delay) { 600 ret = nfs4_delay(&exception->timeout, 601 exception->interruptible); 602 goto out_retry; 603 } 604 if (exception->recovering) { 605 if (exception->task_is_privileged) 606 return -EDEADLOCK; 607 ret = nfs4_wait_clnt_recover(clp); 608 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 609 return -EIO; 610 goto out_retry; 611 } 612 return ret; 613 out_retry: 614 if (ret == 0) 615 exception->retry = 1; 616 return ret; 617 } 618 619 static int 620 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 621 int errorcode, struct nfs4_exception *exception) 622 { 623 struct nfs_client *clp = server->nfs_client; 624 int ret; 625 626 ret = nfs4_do_handle_exception(server, errorcode, exception); 627 if (exception->delay) { 628 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 629 goto out_retry; 630 } 631 if (exception->recovering) { 632 if (exception->task_is_privileged) 633 return -EDEADLOCK; 634 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 635 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 636 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 637 goto out_retry; 638 } 639 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 640 ret = -EIO; 641 return ret; 642 out_retry: 643 if (ret == 0) { 644 exception->retry = 1; 645 /* 646 * For NFS4ERR_MOVED, the client transport will need to 647 * be recomputed after migration recovery has completed. 648 */ 649 if (errorcode == -NFS4ERR_MOVED) 650 rpc_task_release_transport(task); 651 } 652 return ret; 653 } 654 655 int 656 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 657 struct nfs4_state *state, long *timeout) 658 { 659 struct nfs4_exception exception = { 660 .state = state, 661 }; 662 663 if (task->tk_status >= 0) 664 return 0; 665 if (timeout) 666 exception.timeout = *timeout; 667 task->tk_status = nfs4_async_handle_exception(task, server, 668 task->tk_status, 669 &exception); 670 if (exception.delay && timeout) 671 *timeout = exception.timeout; 672 if (exception.retry) 673 return -EAGAIN; 674 return 0; 675 } 676 677 /* 678 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 679 * or 'false' otherwise. 680 */ 681 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 682 { 683 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 684 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 685 } 686 687 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 688 { 689 spin_lock(&clp->cl_lock); 690 if (time_before(clp->cl_last_renewal,timestamp)) 691 clp->cl_last_renewal = timestamp; 692 spin_unlock(&clp->cl_lock); 693 } 694 695 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 696 { 697 struct nfs_client *clp = server->nfs_client; 698 699 if (!nfs4_has_session(clp)) 700 do_renew_lease(clp, timestamp); 701 } 702 703 struct nfs4_call_sync_data { 704 const struct nfs_server *seq_server; 705 struct nfs4_sequence_args *seq_args; 706 struct nfs4_sequence_res *seq_res; 707 }; 708 709 void nfs4_init_sequence(struct nfs4_sequence_args *args, 710 struct nfs4_sequence_res *res, int cache_reply, 711 int privileged) 712 { 713 args->sa_slot = NULL; 714 args->sa_cache_this = cache_reply; 715 args->sa_privileged = privileged; 716 717 res->sr_slot = NULL; 718 } 719 720 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 721 { 722 struct nfs4_slot *slot = res->sr_slot; 723 struct nfs4_slot_table *tbl; 724 725 tbl = slot->table; 726 spin_lock(&tbl->slot_tbl_lock); 727 if (!nfs41_wake_and_assign_slot(tbl, slot)) 728 nfs4_free_slot(tbl, slot); 729 spin_unlock(&tbl->slot_tbl_lock); 730 731 res->sr_slot = NULL; 732 } 733 734 static int nfs40_sequence_done(struct rpc_task *task, 735 struct nfs4_sequence_res *res) 736 { 737 if (res->sr_slot != NULL) 738 nfs40_sequence_free_slot(res); 739 return 1; 740 } 741 742 #if defined(CONFIG_NFS_V4_1) 743 744 static void nfs41_release_slot(struct nfs4_slot *slot) 745 { 746 struct nfs4_session *session; 747 struct nfs4_slot_table *tbl; 748 bool send_new_highest_used_slotid = false; 749 750 if (!slot) 751 return; 752 tbl = slot->table; 753 session = tbl->session; 754 755 /* Bump the slot sequence number */ 756 if (slot->seq_done) 757 slot->seq_nr++; 758 slot->seq_done = 0; 759 760 spin_lock(&tbl->slot_tbl_lock); 761 /* Be nice to the server: try to ensure that the last transmitted 762 * value for highest_user_slotid <= target_highest_slotid 763 */ 764 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 765 send_new_highest_used_slotid = true; 766 767 if (nfs41_wake_and_assign_slot(tbl, slot)) { 768 send_new_highest_used_slotid = false; 769 goto out_unlock; 770 } 771 nfs4_free_slot(tbl, slot); 772 773 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 774 send_new_highest_used_slotid = false; 775 out_unlock: 776 spin_unlock(&tbl->slot_tbl_lock); 777 if (send_new_highest_used_slotid) 778 nfs41_notify_server(session->clp); 779 if (waitqueue_active(&tbl->slot_waitq)) 780 wake_up_all(&tbl->slot_waitq); 781 } 782 783 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 784 { 785 nfs41_release_slot(res->sr_slot); 786 res->sr_slot = NULL; 787 } 788 789 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 790 u32 seqnr) 791 { 792 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 793 slot->seq_nr_highest_sent = seqnr; 794 } 795 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 796 { 797 nfs4_slot_sequence_record_sent(slot, seqnr); 798 slot->seq_nr_last_acked = seqnr; 799 } 800 801 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 802 struct nfs4_slot *slot) 803 { 804 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 805 if (!IS_ERR(task)) 806 rpc_put_task_async(task); 807 } 808 809 static int nfs41_sequence_process(struct rpc_task *task, 810 struct nfs4_sequence_res *res) 811 { 812 struct nfs4_session *session; 813 struct nfs4_slot *slot = res->sr_slot; 814 struct nfs_client *clp; 815 int status; 816 int ret = 1; 817 818 if (slot == NULL) 819 goto out_noaction; 820 /* don't increment the sequence number if the task wasn't sent */ 821 if (!RPC_WAS_SENT(task) || slot->seq_done) 822 goto out; 823 824 session = slot->table->session; 825 clp = session->clp; 826 827 trace_nfs4_sequence_done(session, res); 828 829 status = res->sr_status; 830 if (task->tk_status == -NFS4ERR_DEADSESSION) 831 status = -NFS4ERR_DEADSESSION; 832 833 /* Check the SEQUENCE operation status */ 834 switch (status) { 835 case 0: 836 /* Mark this sequence number as having been acked */ 837 nfs4_slot_sequence_acked(slot, slot->seq_nr); 838 /* Update the slot's sequence and clientid lease timer */ 839 slot->seq_done = 1; 840 do_renew_lease(clp, res->sr_timestamp); 841 /* Check sequence flags */ 842 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 843 !!slot->privileged); 844 nfs41_update_target_slotid(slot->table, slot, res); 845 break; 846 case 1: 847 /* 848 * sr_status remains 1 if an RPC level error occurred. 849 * The server may or may not have processed the sequence 850 * operation.. 851 */ 852 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 853 slot->seq_done = 1; 854 goto out; 855 case -NFS4ERR_DELAY: 856 /* The server detected a resend of the RPC call and 857 * returned NFS4ERR_DELAY as per Section 2.10.6.2 858 * of RFC5661. 859 */ 860 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 861 __func__, 862 slot->slot_nr, 863 slot->seq_nr); 864 goto out_retry; 865 case -NFS4ERR_RETRY_UNCACHED_REP: 866 case -NFS4ERR_SEQ_FALSE_RETRY: 867 /* 868 * The server thinks we tried to replay a request. 869 * Retry the call after bumping the sequence ID. 870 */ 871 nfs4_slot_sequence_acked(slot, slot->seq_nr); 872 goto retry_new_seq; 873 case -NFS4ERR_BADSLOT: 874 /* 875 * The slot id we used was probably retired. Try again 876 * using a different slot id. 877 */ 878 if (slot->slot_nr < slot->table->target_highest_slotid) 879 goto session_recover; 880 goto retry_nowait; 881 case -NFS4ERR_SEQ_MISORDERED: 882 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 883 /* 884 * Were one or more calls using this slot interrupted? 885 * If the server never received the request, then our 886 * transmitted slot sequence number may be too high. However, 887 * if the server did receive the request then it might 888 * accidentally give us a reply with a mismatched operation. 889 * We can sort this out by sending a lone sequence operation 890 * to the server on the same slot. 891 */ 892 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 893 slot->seq_nr--; 894 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 895 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 896 res->sr_slot = NULL; 897 } 898 goto retry_nowait; 899 } 900 /* 901 * RFC5661: 902 * A retry might be sent while the original request is 903 * still in progress on the replier. The replier SHOULD 904 * deal with the issue by returning NFS4ERR_DELAY as the 905 * reply to SEQUENCE or CB_SEQUENCE operation, but 906 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 907 * 908 * Restart the search after a delay. 909 */ 910 slot->seq_nr = slot->seq_nr_highest_sent; 911 goto out_retry; 912 case -NFS4ERR_BADSESSION: 913 case -NFS4ERR_DEADSESSION: 914 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 915 goto session_recover; 916 default: 917 /* Just update the slot sequence no. */ 918 slot->seq_done = 1; 919 } 920 out: 921 /* The session may be reset by one of the error handlers. */ 922 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 923 out_noaction: 924 return ret; 925 session_recover: 926 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state); 927 nfs4_schedule_session_recovery(session, status); 928 dprintk("%s ERROR: %d Reset session\n", __func__, status); 929 nfs41_sequence_free_slot(res); 930 goto out; 931 retry_new_seq: 932 ++slot->seq_nr; 933 retry_nowait: 934 if (rpc_restart_call_prepare(task)) { 935 nfs41_sequence_free_slot(res); 936 task->tk_status = 0; 937 ret = 0; 938 } 939 goto out; 940 out_retry: 941 if (!rpc_restart_call(task)) 942 goto out; 943 rpc_delay(task, NFS4_POLL_RETRY_MAX); 944 return 0; 945 } 946 947 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 948 { 949 if (!nfs41_sequence_process(task, res)) 950 return 0; 951 if (res->sr_slot != NULL) 952 nfs41_sequence_free_slot(res); 953 return 1; 954 955 } 956 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 957 958 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 959 { 960 if (res->sr_slot == NULL) 961 return 1; 962 if (res->sr_slot->table->session != NULL) 963 return nfs41_sequence_process(task, res); 964 return nfs40_sequence_done(task, res); 965 } 966 967 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 968 { 969 if (res->sr_slot != NULL) { 970 if (res->sr_slot->table->session != NULL) 971 nfs41_sequence_free_slot(res); 972 else 973 nfs40_sequence_free_slot(res); 974 } 975 } 976 977 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 978 { 979 if (res->sr_slot == NULL) 980 return 1; 981 if (!res->sr_slot->table->session) 982 return nfs40_sequence_done(task, res); 983 return nfs41_sequence_done(task, res); 984 } 985 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 986 987 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 988 { 989 struct nfs4_call_sync_data *data = calldata; 990 991 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 992 993 nfs4_setup_sequence(data->seq_server->nfs_client, 994 data->seq_args, data->seq_res, task); 995 } 996 997 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 998 { 999 struct nfs4_call_sync_data *data = calldata; 1000 1001 nfs41_sequence_done(task, data->seq_res); 1002 } 1003 1004 static const struct rpc_call_ops nfs41_call_sync_ops = { 1005 .rpc_call_prepare = nfs41_call_sync_prepare, 1006 .rpc_call_done = nfs41_call_sync_done, 1007 }; 1008 1009 #else /* !CONFIG_NFS_V4_1 */ 1010 1011 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1012 { 1013 return nfs40_sequence_done(task, res); 1014 } 1015 1016 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1017 { 1018 if (res->sr_slot != NULL) 1019 nfs40_sequence_free_slot(res); 1020 } 1021 1022 int nfs4_sequence_done(struct rpc_task *task, 1023 struct nfs4_sequence_res *res) 1024 { 1025 return nfs40_sequence_done(task, res); 1026 } 1027 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1028 1029 #endif /* !CONFIG_NFS_V4_1 */ 1030 1031 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1032 { 1033 res->sr_timestamp = jiffies; 1034 res->sr_status_flags = 0; 1035 res->sr_status = 1; 1036 } 1037 1038 static 1039 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1040 struct nfs4_sequence_res *res, 1041 struct nfs4_slot *slot) 1042 { 1043 if (!slot) 1044 return; 1045 slot->privileged = args->sa_privileged ? 1 : 0; 1046 args->sa_slot = slot; 1047 1048 res->sr_slot = slot; 1049 } 1050 1051 int nfs4_setup_sequence(struct nfs_client *client, 1052 struct nfs4_sequence_args *args, 1053 struct nfs4_sequence_res *res, 1054 struct rpc_task *task) 1055 { 1056 struct nfs4_session *session = nfs4_get_session(client); 1057 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1058 struct nfs4_slot *slot; 1059 1060 /* slot already allocated? */ 1061 if (res->sr_slot != NULL) 1062 goto out_start; 1063 1064 if (session) 1065 tbl = &session->fc_slot_table; 1066 1067 spin_lock(&tbl->slot_tbl_lock); 1068 /* The state manager will wait until the slot table is empty */ 1069 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1070 goto out_sleep; 1071 1072 slot = nfs4_alloc_slot(tbl); 1073 if (IS_ERR(slot)) { 1074 if (slot == ERR_PTR(-ENOMEM)) 1075 goto out_sleep_timeout; 1076 goto out_sleep; 1077 } 1078 spin_unlock(&tbl->slot_tbl_lock); 1079 1080 nfs4_sequence_attach_slot(args, res, slot); 1081 1082 trace_nfs4_setup_sequence(session, args); 1083 out_start: 1084 nfs41_sequence_res_init(res); 1085 rpc_call_start(task); 1086 return 0; 1087 out_sleep_timeout: 1088 /* Try again in 1/4 second */ 1089 if (args->sa_privileged) 1090 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1091 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1092 else 1093 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1094 NULL, jiffies + (HZ >> 2)); 1095 spin_unlock(&tbl->slot_tbl_lock); 1096 return -EAGAIN; 1097 out_sleep: 1098 if (args->sa_privileged) 1099 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1100 RPC_PRIORITY_PRIVILEGED); 1101 else 1102 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1103 spin_unlock(&tbl->slot_tbl_lock); 1104 return -EAGAIN; 1105 } 1106 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1107 1108 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1109 { 1110 struct nfs4_call_sync_data *data = calldata; 1111 nfs4_setup_sequence(data->seq_server->nfs_client, 1112 data->seq_args, data->seq_res, task); 1113 } 1114 1115 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1116 { 1117 struct nfs4_call_sync_data *data = calldata; 1118 nfs4_sequence_done(task, data->seq_res); 1119 } 1120 1121 static const struct rpc_call_ops nfs40_call_sync_ops = { 1122 .rpc_call_prepare = nfs40_call_sync_prepare, 1123 .rpc_call_done = nfs40_call_sync_done, 1124 }; 1125 1126 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1127 { 1128 int ret; 1129 struct rpc_task *task; 1130 1131 task = rpc_run_task(task_setup); 1132 if (IS_ERR(task)) 1133 return PTR_ERR(task); 1134 1135 ret = task->tk_status; 1136 rpc_put_task(task); 1137 return ret; 1138 } 1139 1140 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1141 struct nfs_server *server, 1142 struct rpc_message *msg, 1143 struct nfs4_sequence_args *args, 1144 struct nfs4_sequence_res *res, 1145 unsigned short task_flags) 1146 { 1147 struct nfs_client *clp = server->nfs_client; 1148 struct nfs4_call_sync_data data = { 1149 .seq_server = server, 1150 .seq_args = args, 1151 .seq_res = res, 1152 }; 1153 struct rpc_task_setup task_setup = { 1154 .rpc_client = clnt, 1155 .rpc_message = msg, 1156 .callback_ops = clp->cl_mvops->call_sync_ops, 1157 .callback_data = &data, 1158 .flags = task_flags, 1159 }; 1160 1161 return nfs4_call_sync_custom(&task_setup); 1162 } 1163 1164 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1165 struct nfs_server *server, 1166 struct rpc_message *msg, 1167 struct nfs4_sequence_args *args, 1168 struct nfs4_sequence_res *res) 1169 { 1170 unsigned short task_flags = 0; 1171 1172 if (server->caps & NFS_CAP_MOVEABLE) 1173 task_flags = RPC_TASK_MOVEABLE; 1174 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1175 } 1176 1177 1178 int nfs4_call_sync(struct rpc_clnt *clnt, 1179 struct nfs_server *server, 1180 struct rpc_message *msg, 1181 struct nfs4_sequence_args *args, 1182 struct nfs4_sequence_res *res, 1183 int cache_reply) 1184 { 1185 nfs4_init_sequence(args, res, cache_reply, 0); 1186 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1187 } 1188 1189 static void 1190 nfs4_inc_nlink_locked(struct inode *inode) 1191 { 1192 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1193 NFS_INO_INVALID_CTIME | 1194 NFS_INO_INVALID_NLINK); 1195 inc_nlink(inode); 1196 } 1197 1198 static void 1199 nfs4_inc_nlink(struct inode *inode) 1200 { 1201 spin_lock(&inode->i_lock); 1202 nfs4_inc_nlink_locked(inode); 1203 spin_unlock(&inode->i_lock); 1204 } 1205 1206 static void 1207 nfs4_dec_nlink_locked(struct inode *inode) 1208 { 1209 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1210 NFS_INO_INVALID_CTIME | 1211 NFS_INO_INVALID_NLINK); 1212 drop_nlink(inode); 1213 } 1214 1215 static void 1216 nfs4_update_changeattr_locked(struct inode *inode, 1217 struct nfs4_change_info *cinfo, 1218 unsigned long timestamp, unsigned long cache_validity) 1219 { 1220 struct nfs_inode *nfsi = NFS_I(inode); 1221 u64 change_attr = inode_peek_iversion_raw(inode); 1222 1223 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1224 if (S_ISDIR(inode->i_mode)) 1225 cache_validity |= NFS_INO_INVALID_DATA; 1226 1227 switch (NFS_SERVER(inode)->change_attr_type) { 1228 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1229 if (cinfo->after == change_attr) 1230 goto out; 1231 break; 1232 default: 1233 if ((s64)(change_attr - cinfo->after) >= 0) 1234 goto out; 1235 } 1236 1237 inode_set_iversion_raw(inode, cinfo->after); 1238 if (!cinfo->atomic || cinfo->before != change_attr) { 1239 if (S_ISDIR(inode->i_mode)) 1240 nfs_force_lookup_revalidate(inode); 1241 1242 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1243 cache_validity |= 1244 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1245 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1246 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1247 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1248 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1249 } 1250 nfsi->attrtimeo_timestamp = jiffies; 1251 nfsi->read_cache_jiffies = timestamp; 1252 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1253 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1254 out: 1255 nfs_set_cache_invalid(inode, cache_validity); 1256 } 1257 1258 void 1259 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1260 unsigned long timestamp, unsigned long cache_validity) 1261 { 1262 spin_lock(&dir->i_lock); 1263 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1264 spin_unlock(&dir->i_lock); 1265 } 1266 1267 struct nfs4_open_createattrs { 1268 struct nfs4_label *label; 1269 struct iattr *sattr; 1270 const __u32 verf[2]; 1271 }; 1272 1273 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1274 int err, struct nfs4_exception *exception) 1275 { 1276 if (err != -EINVAL) 1277 return false; 1278 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1279 return false; 1280 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1281 exception->retry = 1; 1282 return true; 1283 } 1284 1285 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1286 { 1287 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1288 } 1289 1290 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1291 { 1292 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1293 1294 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1295 } 1296 1297 static u32 1298 nfs4_map_atomic_open_share(struct nfs_server *server, 1299 fmode_t fmode, int openflags) 1300 { 1301 u32 res = 0; 1302 1303 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1304 case FMODE_READ: 1305 res = NFS4_SHARE_ACCESS_READ; 1306 break; 1307 case FMODE_WRITE: 1308 res = NFS4_SHARE_ACCESS_WRITE; 1309 break; 1310 case FMODE_READ|FMODE_WRITE: 1311 res = NFS4_SHARE_ACCESS_BOTH; 1312 } 1313 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1314 goto out; 1315 /* Want no delegation if we're using O_DIRECT */ 1316 if (openflags & O_DIRECT) 1317 res |= NFS4_SHARE_WANT_NO_DELEG; 1318 out: 1319 return res; 1320 } 1321 1322 static enum open_claim_type4 1323 nfs4_map_atomic_open_claim(struct nfs_server *server, 1324 enum open_claim_type4 claim) 1325 { 1326 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1327 return claim; 1328 switch (claim) { 1329 default: 1330 return claim; 1331 case NFS4_OPEN_CLAIM_FH: 1332 return NFS4_OPEN_CLAIM_NULL; 1333 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1334 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1335 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1336 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1337 } 1338 } 1339 1340 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1341 { 1342 p->o_res.f_attr = &p->f_attr; 1343 p->o_res.seqid = p->o_arg.seqid; 1344 p->c_res.seqid = p->c_arg.seqid; 1345 p->o_res.server = p->o_arg.server; 1346 p->o_res.access_request = p->o_arg.access; 1347 nfs_fattr_init(&p->f_attr); 1348 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1349 } 1350 1351 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1352 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1353 const struct nfs4_open_createattrs *c, 1354 enum open_claim_type4 claim, 1355 gfp_t gfp_mask) 1356 { 1357 struct dentry *parent = dget_parent(dentry); 1358 struct inode *dir = d_inode(parent); 1359 struct nfs_server *server = NFS_SERVER(dir); 1360 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1361 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1362 struct nfs4_opendata *p; 1363 1364 p = kzalloc(sizeof(*p), gfp_mask); 1365 if (p == NULL) 1366 goto err; 1367 1368 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1369 if (IS_ERR(p->f_attr.label)) 1370 goto err_free_p; 1371 1372 p->a_label = nfs4_label_alloc(server, gfp_mask); 1373 if (IS_ERR(p->a_label)) 1374 goto err_free_f; 1375 1376 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1377 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1378 if (IS_ERR(p->o_arg.seqid)) 1379 goto err_free_label; 1380 nfs_sb_active(dentry->d_sb); 1381 p->dentry = dget(dentry); 1382 p->dir = parent; 1383 p->owner = sp; 1384 atomic_inc(&sp->so_count); 1385 p->o_arg.open_flags = flags; 1386 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1387 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1388 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1389 fmode, flags); 1390 if (flags & O_CREAT) { 1391 p->o_arg.umask = current_umask(); 1392 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1393 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1394 p->o_arg.u.attrs = &p->attrs; 1395 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1396 1397 memcpy(p->o_arg.u.verifier.data, c->verf, 1398 sizeof(p->o_arg.u.verifier.data)); 1399 } 1400 } 1401 /* ask server to check for all possible rights as results 1402 * are cached */ 1403 switch (p->o_arg.claim) { 1404 default: 1405 break; 1406 case NFS4_OPEN_CLAIM_NULL: 1407 case NFS4_OPEN_CLAIM_FH: 1408 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1409 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1410 NFS4_ACCESS_EXECUTE | 1411 nfs_access_xattr_mask(server); 1412 } 1413 p->o_arg.clientid = server->nfs_client->cl_clientid; 1414 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1415 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1416 p->o_arg.name = &dentry->d_name; 1417 p->o_arg.server = server; 1418 p->o_arg.bitmask = nfs4_bitmask(server, label); 1419 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1420 switch (p->o_arg.claim) { 1421 case NFS4_OPEN_CLAIM_NULL: 1422 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1423 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1424 p->o_arg.fh = NFS_FH(dir); 1425 break; 1426 case NFS4_OPEN_CLAIM_PREVIOUS: 1427 case NFS4_OPEN_CLAIM_FH: 1428 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1429 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1430 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1431 } 1432 p->c_arg.fh = &p->o_res.fh; 1433 p->c_arg.stateid = &p->o_res.stateid; 1434 p->c_arg.seqid = p->o_arg.seqid; 1435 nfs4_init_opendata_res(p); 1436 kref_init(&p->kref); 1437 return p; 1438 1439 err_free_label: 1440 nfs4_label_free(p->a_label); 1441 err_free_f: 1442 nfs4_label_free(p->f_attr.label); 1443 err_free_p: 1444 kfree(p); 1445 err: 1446 dput(parent); 1447 return NULL; 1448 } 1449 1450 static void nfs4_opendata_free(struct kref *kref) 1451 { 1452 struct nfs4_opendata *p = container_of(kref, 1453 struct nfs4_opendata, kref); 1454 struct super_block *sb = p->dentry->d_sb; 1455 1456 nfs4_lgopen_release(p->lgp); 1457 nfs_free_seqid(p->o_arg.seqid); 1458 nfs4_sequence_free_slot(&p->o_res.seq_res); 1459 if (p->state != NULL) 1460 nfs4_put_open_state(p->state); 1461 nfs4_put_state_owner(p->owner); 1462 1463 nfs4_label_free(p->a_label); 1464 nfs4_label_free(p->f_attr.label); 1465 1466 dput(p->dir); 1467 dput(p->dentry); 1468 nfs_sb_deactive(sb); 1469 nfs_fattr_free_names(&p->f_attr); 1470 kfree(p->f_attr.mdsthreshold); 1471 kfree(p); 1472 } 1473 1474 static void nfs4_opendata_put(struct nfs4_opendata *p) 1475 { 1476 if (p != NULL) 1477 kref_put(&p->kref, nfs4_opendata_free); 1478 } 1479 1480 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1481 fmode_t fmode) 1482 { 1483 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1484 case FMODE_READ|FMODE_WRITE: 1485 return state->n_rdwr != 0; 1486 case FMODE_WRITE: 1487 return state->n_wronly != 0; 1488 case FMODE_READ: 1489 return state->n_rdonly != 0; 1490 } 1491 WARN_ON_ONCE(1); 1492 return false; 1493 } 1494 1495 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1496 int open_mode, enum open_claim_type4 claim) 1497 { 1498 int ret = 0; 1499 1500 if (open_mode & (O_EXCL|O_TRUNC)) 1501 goto out; 1502 switch (claim) { 1503 case NFS4_OPEN_CLAIM_NULL: 1504 case NFS4_OPEN_CLAIM_FH: 1505 goto out; 1506 default: 1507 break; 1508 } 1509 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1510 case FMODE_READ: 1511 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1512 && state->n_rdonly != 0; 1513 break; 1514 case FMODE_WRITE: 1515 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1516 && state->n_wronly != 0; 1517 break; 1518 case FMODE_READ|FMODE_WRITE: 1519 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1520 && state->n_rdwr != 0; 1521 } 1522 out: 1523 return ret; 1524 } 1525 1526 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1527 enum open_claim_type4 claim) 1528 { 1529 if (delegation == NULL) 1530 return 0; 1531 if ((delegation->type & fmode) != fmode) 1532 return 0; 1533 switch (claim) { 1534 case NFS4_OPEN_CLAIM_NULL: 1535 case NFS4_OPEN_CLAIM_FH: 1536 break; 1537 case NFS4_OPEN_CLAIM_PREVIOUS: 1538 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1539 break; 1540 fallthrough; 1541 default: 1542 return 0; 1543 } 1544 nfs_mark_delegation_referenced(delegation); 1545 return 1; 1546 } 1547 1548 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1549 { 1550 switch (fmode) { 1551 case FMODE_WRITE: 1552 state->n_wronly++; 1553 break; 1554 case FMODE_READ: 1555 state->n_rdonly++; 1556 break; 1557 case FMODE_READ|FMODE_WRITE: 1558 state->n_rdwr++; 1559 } 1560 nfs4_state_set_mode_locked(state, state->state | fmode); 1561 } 1562 1563 #ifdef CONFIG_NFS_V4_1 1564 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1565 { 1566 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1567 return true; 1568 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1569 return true; 1570 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1571 return true; 1572 return false; 1573 } 1574 #endif /* CONFIG_NFS_V4_1 */ 1575 1576 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1577 { 1578 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1579 wake_up_all(&state->waitq); 1580 } 1581 1582 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1583 { 1584 struct nfs_client *clp = state->owner->so_server->nfs_client; 1585 bool need_recover = false; 1586 1587 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1588 need_recover = true; 1589 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1590 need_recover = true; 1591 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1592 need_recover = true; 1593 if (need_recover) 1594 nfs4_state_mark_reclaim_nograce(clp, state); 1595 } 1596 1597 /* 1598 * Check for whether or not the caller may update the open stateid 1599 * to the value passed in by stateid. 1600 * 1601 * Note: This function relies heavily on the server implementing 1602 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1603 * correctly. 1604 * i.e. The stateid seqids have to be initialised to 1, and 1605 * are then incremented on every state transition. 1606 */ 1607 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1608 const nfs4_stateid *stateid) 1609 { 1610 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1611 /* The common case - we're updating to a new sequence number */ 1612 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1613 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1614 return true; 1615 return false; 1616 } 1617 /* The server returned a new stateid */ 1618 } 1619 /* This is the first OPEN in this generation */ 1620 if (stateid->seqid == cpu_to_be32(1)) 1621 return true; 1622 return false; 1623 } 1624 1625 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1626 { 1627 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1628 return; 1629 if (state->n_wronly) 1630 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1631 if (state->n_rdonly) 1632 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1633 if (state->n_rdwr) 1634 set_bit(NFS_O_RDWR_STATE, &state->flags); 1635 set_bit(NFS_OPEN_STATE, &state->flags); 1636 } 1637 1638 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1639 nfs4_stateid *stateid, fmode_t fmode) 1640 { 1641 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1642 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1643 case FMODE_WRITE: 1644 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1645 break; 1646 case FMODE_READ: 1647 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1648 break; 1649 case 0: 1650 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1651 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1652 clear_bit(NFS_OPEN_STATE, &state->flags); 1653 } 1654 if (stateid == NULL) 1655 return; 1656 /* Handle OPEN+OPEN_DOWNGRADE races */ 1657 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1658 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1659 nfs_resync_open_stateid_locked(state); 1660 goto out; 1661 } 1662 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1663 nfs4_stateid_copy(&state->stateid, stateid); 1664 nfs4_stateid_copy(&state->open_stateid, stateid); 1665 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1666 out: 1667 nfs_state_log_update_open_stateid(state); 1668 } 1669 1670 static void nfs_clear_open_stateid(struct nfs4_state *state, 1671 nfs4_stateid *arg_stateid, 1672 nfs4_stateid *stateid, fmode_t fmode) 1673 { 1674 write_seqlock(&state->seqlock); 1675 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1676 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1677 nfs_clear_open_stateid_locked(state, stateid, fmode); 1678 write_sequnlock(&state->seqlock); 1679 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1680 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1681 } 1682 1683 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1684 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1685 __must_hold(&state->owner->so_lock) 1686 __must_hold(&state->seqlock) 1687 __must_hold(RCU) 1688 1689 { 1690 DEFINE_WAIT(wait); 1691 int status = 0; 1692 for (;;) { 1693 1694 if (nfs_stateid_is_sequential(state, stateid)) 1695 break; 1696 1697 if (status) 1698 break; 1699 /* Rely on seqids for serialisation with NFSv4.0 */ 1700 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1701 break; 1702 1703 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1704 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1705 /* 1706 * Ensure we process the state changes in the same order 1707 * in which the server processed them by delaying the 1708 * update of the stateid until we are in sequence. 1709 */ 1710 write_sequnlock(&state->seqlock); 1711 spin_unlock(&state->owner->so_lock); 1712 rcu_read_unlock(); 1713 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1714 1715 if (!fatal_signal_pending(current)) { 1716 if (schedule_timeout(5*HZ) == 0) 1717 status = -EAGAIN; 1718 else 1719 status = 0; 1720 } else 1721 status = -EINTR; 1722 finish_wait(&state->waitq, &wait); 1723 rcu_read_lock(); 1724 spin_lock(&state->owner->so_lock); 1725 write_seqlock(&state->seqlock); 1726 } 1727 1728 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1729 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1730 nfs4_stateid_copy(freeme, &state->open_stateid); 1731 nfs_test_and_clear_all_open_stateid(state); 1732 } 1733 1734 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1735 nfs4_stateid_copy(&state->stateid, stateid); 1736 nfs4_stateid_copy(&state->open_stateid, stateid); 1737 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1738 nfs_state_log_update_open_stateid(state); 1739 } 1740 1741 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1742 const nfs4_stateid *open_stateid, 1743 fmode_t fmode, 1744 nfs4_stateid *freeme) 1745 { 1746 /* 1747 * Protect the call to nfs4_state_set_mode_locked and 1748 * serialise the stateid update 1749 */ 1750 write_seqlock(&state->seqlock); 1751 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1752 switch (fmode) { 1753 case FMODE_READ: 1754 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1755 break; 1756 case FMODE_WRITE: 1757 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1758 break; 1759 case FMODE_READ|FMODE_WRITE: 1760 set_bit(NFS_O_RDWR_STATE, &state->flags); 1761 } 1762 set_bit(NFS_OPEN_STATE, &state->flags); 1763 write_sequnlock(&state->seqlock); 1764 } 1765 1766 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1767 { 1768 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1769 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1770 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1771 clear_bit(NFS_OPEN_STATE, &state->flags); 1772 } 1773 1774 static void nfs_state_set_delegation(struct nfs4_state *state, 1775 const nfs4_stateid *deleg_stateid, 1776 fmode_t fmode) 1777 { 1778 /* 1779 * Protect the call to nfs4_state_set_mode_locked and 1780 * serialise the stateid update 1781 */ 1782 write_seqlock(&state->seqlock); 1783 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1784 set_bit(NFS_DELEGATED_STATE, &state->flags); 1785 write_sequnlock(&state->seqlock); 1786 } 1787 1788 static void nfs_state_clear_delegation(struct nfs4_state *state) 1789 { 1790 write_seqlock(&state->seqlock); 1791 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1792 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1793 write_sequnlock(&state->seqlock); 1794 } 1795 1796 int update_open_stateid(struct nfs4_state *state, 1797 const nfs4_stateid *open_stateid, 1798 const nfs4_stateid *delegation, 1799 fmode_t fmode) 1800 { 1801 struct nfs_server *server = NFS_SERVER(state->inode); 1802 struct nfs_client *clp = server->nfs_client; 1803 struct nfs_inode *nfsi = NFS_I(state->inode); 1804 struct nfs_delegation *deleg_cur; 1805 nfs4_stateid freeme = { }; 1806 int ret = 0; 1807 1808 fmode &= (FMODE_READ|FMODE_WRITE); 1809 1810 rcu_read_lock(); 1811 spin_lock(&state->owner->so_lock); 1812 if (open_stateid != NULL) { 1813 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1814 ret = 1; 1815 } 1816 1817 deleg_cur = nfs4_get_valid_delegation(state->inode); 1818 if (deleg_cur == NULL) 1819 goto no_delegation; 1820 1821 spin_lock(&deleg_cur->lock); 1822 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1823 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1824 (deleg_cur->type & fmode) != fmode) 1825 goto no_delegation_unlock; 1826 1827 if (delegation == NULL) 1828 delegation = &deleg_cur->stateid; 1829 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1830 goto no_delegation_unlock; 1831 1832 nfs_mark_delegation_referenced(deleg_cur); 1833 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1834 ret = 1; 1835 no_delegation_unlock: 1836 spin_unlock(&deleg_cur->lock); 1837 no_delegation: 1838 if (ret) 1839 update_open_stateflags(state, fmode); 1840 spin_unlock(&state->owner->so_lock); 1841 rcu_read_unlock(); 1842 1843 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1844 nfs4_schedule_state_manager(clp); 1845 if (freeme.type != 0) 1846 nfs4_test_and_free_stateid(server, &freeme, 1847 state->owner->so_cred); 1848 1849 return ret; 1850 } 1851 1852 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1853 const nfs4_stateid *stateid) 1854 { 1855 struct nfs4_state *state = lsp->ls_state; 1856 bool ret = false; 1857 1858 spin_lock(&state->state_lock); 1859 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1860 goto out_noupdate; 1861 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1862 goto out_noupdate; 1863 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1864 ret = true; 1865 out_noupdate: 1866 spin_unlock(&state->state_lock); 1867 return ret; 1868 } 1869 1870 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1871 { 1872 struct nfs_delegation *delegation; 1873 1874 fmode &= FMODE_READ|FMODE_WRITE; 1875 rcu_read_lock(); 1876 delegation = nfs4_get_valid_delegation(inode); 1877 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1878 rcu_read_unlock(); 1879 return; 1880 } 1881 rcu_read_unlock(); 1882 nfs4_inode_return_delegation(inode); 1883 } 1884 1885 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1886 { 1887 struct nfs4_state *state = opendata->state; 1888 struct nfs_delegation *delegation; 1889 int open_mode = opendata->o_arg.open_flags; 1890 fmode_t fmode = opendata->o_arg.fmode; 1891 enum open_claim_type4 claim = opendata->o_arg.claim; 1892 nfs4_stateid stateid; 1893 int ret = -EAGAIN; 1894 1895 for (;;) { 1896 spin_lock(&state->owner->so_lock); 1897 if (can_open_cached(state, fmode, open_mode, claim)) { 1898 update_open_stateflags(state, fmode); 1899 spin_unlock(&state->owner->so_lock); 1900 goto out_return_state; 1901 } 1902 spin_unlock(&state->owner->so_lock); 1903 rcu_read_lock(); 1904 delegation = nfs4_get_valid_delegation(state->inode); 1905 if (!can_open_delegated(delegation, fmode, claim)) { 1906 rcu_read_unlock(); 1907 break; 1908 } 1909 /* Save the delegation */ 1910 nfs4_stateid_copy(&stateid, &delegation->stateid); 1911 rcu_read_unlock(); 1912 nfs_release_seqid(opendata->o_arg.seqid); 1913 if (!opendata->is_recover) { 1914 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1915 if (ret != 0) 1916 goto out; 1917 } 1918 ret = -EAGAIN; 1919 1920 /* Try to update the stateid using the delegation */ 1921 if (update_open_stateid(state, NULL, &stateid, fmode)) 1922 goto out_return_state; 1923 } 1924 out: 1925 return ERR_PTR(ret); 1926 out_return_state: 1927 refcount_inc(&state->count); 1928 return state; 1929 } 1930 1931 static void 1932 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1933 { 1934 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1935 struct nfs_delegation *delegation; 1936 int delegation_flags = 0; 1937 1938 rcu_read_lock(); 1939 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1940 if (delegation) 1941 delegation_flags = delegation->flags; 1942 rcu_read_unlock(); 1943 switch (data->o_arg.claim) { 1944 default: 1945 break; 1946 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1947 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1948 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1949 "returning a delegation for " 1950 "OPEN(CLAIM_DELEGATE_CUR)\n", 1951 clp->cl_hostname); 1952 return; 1953 } 1954 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1955 nfs_inode_set_delegation(state->inode, 1956 data->owner->so_cred, 1957 data->o_res.delegation_type, 1958 &data->o_res.delegation, 1959 data->o_res.pagemod_limit); 1960 else 1961 nfs_inode_reclaim_delegation(state->inode, 1962 data->owner->so_cred, 1963 data->o_res.delegation_type, 1964 &data->o_res.delegation, 1965 data->o_res.pagemod_limit); 1966 1967 if (data->o_res.do_recall) 1968 nfs_async_inode_return_delegation(state->inode, 1969 &data->o_res.delegation); 1970 } 1971 1972 /* 1973 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1974 * and update the nfs4_state. 1975 */ 1976 static struct nfs4_state * 1977 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1978 { 1979 struct inode *inode = data->state->inode; 1980 struct nfs4_state *state = data->state; 1981 int ret; 1982 1983 if (!data->rpc_done) { 1984 if (data->rpc_status) 1985 return ERR_PTR(data->rpc_status); 1986 return nfs4_try_open_cached(data); 1987 } 1988 1989 ret = nfs_refresh_inode(inode, &data->f_attr); 1990 if (ret) 1991 return ERR_PTR(ret); 1992 1993 if (data->o_res.delegation_type != 0) 1994 nfs4_opendata_check_deleg(data, state); 1995 1996 if (!update_open_stateid(state, &data->o_res.stateid, 1997 NULL, data->o_arg.fmode)) 1998 return ERR_PTR(-EAGAIN); 1999 refcount_inc(&state->count); 2000 2001 return state; 2002 } 2003 2004 static struct inode * 2005 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2006 { 2007 struct inode *inode; 2008 2009 switch (data->o_arg.claim) { 2010 case NFS4_OPEN_CLAIM_NULL: 2011 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2012 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2013 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2014 return ERR_PTR(-EAGAIN); 2015 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2016 &data->f_attr); 2017 break; 2018 default: 2019 inode = d_inode(data->dentry); 2020 ihold(inode); 2021 nfs_refresh_inode(inode, &data->f_attr); 2022 } 2023 return inode; 2024 } 2025 2026 static struct nfs4_state * 2027 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2028 { 2029 struct nfs4_state *state; 2030 struct inode *inode; 2031 2032 inode = nfs4_opendata_get_inode(data); 2033 if (IS_ERR(inode)) 2034 return ERR_CAST(inode); 2035 if (data->state != NULL && data->state->inode == inode) { 2036 state = data->state; 2037 refcount_inc(&state->count); 2038 } else 2039 state = nfs4_get_open_state(inode, data->owner); 2040 iput(inode); 2041 if (state == NULL) 2042 state = ERR_PTR(-ENOMEM); 2043 return state; 2044 } 2045 2046 static struct nfs4_state * 2047 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2048 { 2049 struct nfs4_state *state; 2050 2051 if (!data->rpc_done) { 2052 state = nfs4_try_open_cached(data); 2053 trace_nfs4_cached_open(data->state); 2054 goto out; 2055 } 2056 2057 state = nfs4_opendata_find_nfs4_state(data); 2058 if (IS_ERR(state)) 2059 goto out; 2060 2061 if (data->o_res.delegation_type != 0) 2062 nfs4_opendata_check_deleg(data, state); 2063 if (!update_open_stateid(state, &data->o_res.stateid, 2064 NULL, data->o_arg.fmode)) { 2065 nfs4_put_open_state(state); 2066 state = ERR_PTR(-EAGAIN); 2067 } 2068 out: 2069 nfs_release_seqid(data->o_arg.seqid); 2070 return state; 2071 } 2072 2073 static struct nfs4_state * 2074 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2075 { 2076 struct nfs4_state *ret; 2077 2078 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2079 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2080 else 2081 ret = _nfs4_opendata_to_nfs4_state(data); 2082 nfs4_sequence_free_slot(&data->o_res.seq_res); 2083 return ret; 2084 } 2085 2086 static struct nfs_open_context * 2087 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2088 { 2089 struct nfs_inode *nfsi = NFS_I(state->inode); 2090 struct nfs_open_context *ctx; 2091 2092 rcu_read_lock(); 2093 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2094 if (ctx->state != state) 2095 continue; 2096 if ((ctx->mode & mode) != mode) 2097 continue; 2098 if (!get_nfs_open_context(ctx)) 2099 continue; 2100 rcu_read_unlock(); 2101 return ctx; 2102 } 2103 rcu_read_unlock(); 2104 return ERR_PTR(-ENOENT); 2105 } 2106 2107 static struct nfs_open_context * 2108 nfs4_state_find_open_context(struct nfs4_state *state) 2109 { 2110 struct nfs_open_context *ctx; 2111 2112 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2113 if (!IS_ERR(ctx)) 2114 return ctx; 2115 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2116 if (!IS_ERR(ctx)) 2117 return ctx; 2118 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2119 } 2120 2121 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2122 struct nfs4_state *state, enum open_claim_type4 claim) 2123 { 2124 struct nfs4_opendata *opendata; 2125 2126 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2127 NULL, claim, GFP_NOFS); 2128 if (opendata == NULL) 2129 return ERR_PTR(-ENOMEM); 2130 opendata->state = state; 2131 refcount_inc(&state->count); 2132 return opendata; 2133 } 2134 2135 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2136 fmode_t fmode) 2137 { 2138 struct nfs4_state *newstate; 2139 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2140 int openflags = opendata->o_arg.open_flags; 2141 int ret; 2142 2143 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2144 return 0; 2145 opendata->o_arg.fmode = fmode; 2146 opendata->o_arg.share_access = 2147 nfs4_map_atomic_open_share(server, fmode, openflags); 2148 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2149 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2150 nfs4_init_opendata_res(opendata); 2151 ret = _nfs4_recover_proc_open(opendata); 2152 if (ret != 0) 2153 return ret; 2154 newstate = nfs4_opendata_to_nfs4_state(opendata); 2155 if (IS_ERR(newstate)) 2156 return PTR_ERR(newstate); 2157 if (newstate != opendata->state) 2158 ret = -ESTALE; 2159 nfs4_close_state(newstate, fmode); 2160 return ret; 2161 } 2162 2163 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2164 { 2165 int ret; 2166 2167 /* memory barrier prior to reading state->n_* */ 2168 smp_rmb(); 2169 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2170 if (ret != 0) 2171 return ret; 2172 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2173 if (ret != 0) 2174 return ret; 2175 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2176 if (ret != 0) 2177 return ret; 2178 /* 2179 * We may have performed cached opens for all three recoveries. 2180 * Check if we need to update the current stateid. 2181 */ 2182 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2183 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2184 write_seqlock(&state->seqlock); 2185 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2186 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2187 write_sequnlock(&state->seqlock); 2188 } 2189 return 0; 2190 } 2191 2192 /* 2193 * OPEN_RECLAIM: 2194 * reclaim state on the server after a reboot. 2195 */ 2196 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2197 { 2198 struct nfs_delegation *delegation; 2199 struct nfs4_opendata *opendata; 2200 fmode_t delegation_type = 0; 2201 int status; 2202 2203 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2204 NFS4_OPEN_CLAIM_PREVIOUS); 2205 if (IS_ERR(opendata)) 2206 return PTR_ERR(opendata); 2207 rcu_read_lock(); 2208 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2209 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2210 delegation_type = delegation->type; 2211 rcu_read_unlock(); 2212 opendata->o_arg.u.delegation_type = delegation_type; 2213 status = nfs4_open_recover(opendata, state); 2214 nfs4_opendata_put(opendata); 2215 return status; 2216 } 2217 2218 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2219 { 2220 struct nfs_server *server = NFS_SERVER(state->inode); 2221 struct nfs4_exception exception = { }; 2222 int err; 2223 do { 2224 err = _nfs4_do_open_reclaim(ctx, state); 2225 trace_nfs4_open_reclaim(ctx, 0, err); 2226 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2227 continue; 2228 if (err != -NFS4ERR_DELAY) 2229 break; 2230 nfs4_handle_exception(server, err, &exception); 2231 } while (exception.retry); 2232 return err; 2233 } 2234 2235 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2236 { 2237 struct nfs_open_context *ctx; 2238 int ret; 2239 2240 ctx = nfs4_state_find_open_context(state); 2241 if (IS_ERR(ctx)) 2242 return -EAGAIN; 2243 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2244 nfs_state_clear_open_state_flags(state); 2245 ret = nfs4_do_open_reclaim(ctx, state); 2246 put_nfs_open_context(ctx); 2247 return ret; 2248 } 2249 2250 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) 2251 { 2252 switch (err) { 2253 default: 2254 printk(KERN_ERR "NFS: %s: unhandled error " 2255 "%d.\n", __func__, err); 2256 fallthrough; 2257 case 0: 2258 case -ENOENT: 2259 case -EAGAIN: 2260 case -ESTALE: 2261 case -ETIMEDOUT: 2262 break; 2263 case -NFS4ERR_BADSESSION: 2264 case -NFS4ERR_BADSLOT: 2265 case -NFS4ERR_BAD_HIGH_SLOT: 2266 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2267 case -NFS4ERR_DEADSESSION: 2268 return -EAGAIN; 2269 case -NFS4ERR_STALE_CLIENTID: 2270 case -NFS4ERR_STALE_STATEID: 2271 /* Don't recall a delegation if it was lost */ 2272 nfs4_schedule_lease_recovery(server->nfs_client); 2273 return -EAGAIN; 2274 case -NFS4ERR_MOVED: 2275 nfs4_schedule_migration_recovery(server); 2276 return -EAGAIN; 2277 case -NFS4ERR_LEASE_MOVED: 2278 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2279 return -EAGAIN; 2280 case -NFS4ERR_DELEG_REVOKED: 2281 case -NFS4ERR_ADMIN_REVOKED: 2282 case -NFS4ERR_EXPIRED: 2283 case -NFS4ERR_BAD_STATEID: 2284 case -NFS4ERR_OPENMODE: 2285 nfs_inode_find_state_and_recover(state->inode, 2286 stateid); 2287 nfs4_schedule_stateid_recovery(server, state); 2288 return -EAGAIN; 2289 case -NFS4ERR_DELAY: 2290 case -NFS4ERR_GRACE: 2291 ssleep(1); 2292 return -EAGAIN; 2293 case -ENOMEM: 2294 case -NFS4ERR_DENIED: 2295 if (fl) { 2296 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2297 if (lsp) 2298 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2299 } 2300 return 0; 2301 } 2302 return err; 2303 } 2304 2305 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2306 struct nfs4_state *state, const nfs4_stateid *stateid) 2307 { 2308 struct nfs_server *server = NFS_SERVER(state->inode); 2309 struct nfs4_opendata *opendata; 2310 int err = 0; 2311 2312 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2313 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2314 if (IS_ERR(opendata)) 2315 return PTR_ERR(opendata); 2316 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2317 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2318 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2319 if (err) 2320 goto out; 2321 } 2322 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2323 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2324 if (err) 2325 goto out; 2326 } 2327 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2328 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2329 if (err) 2330 goto out; 2331 } 2332 nfs_state_clear_delegation(state); 2333 out: 2334 nfs4_opendata_put(opendata); 2335 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2336 } 2337 2338 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2339 { 2340 struct nfs4_opendata *data = calldata; 2341 2342 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2343 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2344 } 2345 2346 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2347 { 2348 struct nfs4_opendata *data = calldata; 2349 2350 nfs40_sequence_done(task, &data->c_res.seq_res); 2351 2352 data->rpc_status = task->tk_status; 2353 if (data->rpc_status == 0) { 2354 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2355 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2356 renew_lease(data->o_res.server, data->timestamp); 2357 data->rpc_done = true; 2358 } 2359 } 2360 2361 static void nfs4_open_confirm_release(void *calldata) 2362 { 2363 struct nfs4_opendata *data = calldata; 2364 struct nfs4_state *state = NULL; 2365 2366 /* If this request hasn't been cancelled, do nothing */ 2367 if (!data->cancelled) 2368 goto out_free; 2369 /* In case of error, no cleanup! */ 2370 if (!data->rpc_done) 2371 goto out_free; 2372 state = nfs4_opendata_to_nfs4_state(data); 2373 if (!IS_ERR(state)) 2374 nfs4_close_state(state, data->o_arg.fmode); 2375 out_free: 2376 nfs4_opendata_put(data); 2377 } 2378 2379 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2380 .rpc_call_prepare = nfs4_open_confirm_prepare, 2381 .rpc_call_done = nfs4_open_confirm_done, 2382 .rpc_release = nfs4_open_confirm_release, 2383 }; 2384 2385 /* 2386 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2387 */ 2388 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2389 { 2390 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2391 struct rpc_task *task; 2392 struct rpc_message msg = { 2393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2394 .rpc_argp = &data->c_arg, 2395 .rpc_resp = &data->c_res, 2396 .rpc_cred = data->owner->so_cred, 2397 }; 2398 struct rpc_task_setup task_setup_data = { 2399 .rpc_client = server->client, 2400 .rpc_message = &msg, 2401 .callback_ops = &nfs4_open_confirm_ops, 2402 .callback_data = data, 2403 .workqueue = nfsiod_workqueue, 2404 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2405 }; 2406 int status; 2407 2408 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2409 data->is_recover); 2410 kref_get(&data->kref); 2411 data->rpc_done = false; 2412 data->rpc_status = 0; 2413 data->timestamp = jiffies; 2414 task = rpc_run_task(&task_setup_data); 2415 if (IS_ERR(task)) 2416 return PTR_ERR(task); 2417 status = rpc_wait_for_completion_task(task); 2418 if (status != 0) { 2419 data->cancelled = true; 2420 smp_wmb(); 2421 } else 2422 status = data->rpc_status; 2423 rpc_put_task(task); 2424 return status; 2425 } 2426 2427 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2428 { 2429 struct nfs4_opendata *data = calldata; 2430 struct nfs4_state_owner *sp = data->owner; 2431 struct nfs_client *clp = sp->so_server->nfs_client; 2432 enum open_claim_type4 claim = data->o_arg.claim; 2433 2434 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2435 goto out_wait; 2436 /* 2437 * Check if we still need to send an OPEN call, or if we can use 2438 * a delegation instead. 2439 */ 2440 if (data->state != NULL) { 2441 struct nfs_delegation *delegation; 2442 2443 if (can_open_cached(data->state, data->o_arg.fmode, 2444 data->o_arg.open_flags, claim)) 2445 goto out_no_action; 2446 rcu_read_lock(); 2447 delegation = nfs4_get_valid_delegation(data->state->inode); 2448 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2449 goto unlock_no_action; 2450 rcu_read_unlock(); 2451 } 2452 /* Update client id. */ 2453 data->o_arg.clientid = clp->cl_clientid; 2454 switch (claim) { 2455 default: 2456 break; 2457 case NFS4_OPEN_CLAIM_PREVIOUS: 2458 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2459 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2460 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2461 fallthrough; 2462 case NFS4_OPEN_CLAIM_FH: 2463 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2464 } 2465 data->timestamp = jiffies; 2466 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2467 &data->o_arg.seq_args, 2468 &data->o_res.seq_res, 2469 task) != 0) 2470 nfs_release_seqid(data->o_arg.seqid); 2471 2472 /* Set the create mode (note dependency on the session type) */ 2473 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2474 if (data->o_arg.open_flags & O_EXCL) { 2475 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2476 if (clp->cl_mvops->minor_version == 0) { 2477 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2478 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2479 * because ACCESS will return permission denied for 2480 * all bits until close */ 2481 data->o_res.access_request = data->o_arg.access = 0; 2482 } else if (nfs4_has_persistent_session(clp)) 2483 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2484 } 2485 return; 2486 unlock_no_action: 2487 trace_nfs4_cached_open(data->state); 2488 rcu_read_unlock(); 2489 out_no_action: 2490 task->tk_action = NULL; 2491 out_wait: 2492 nfs4_sequence_done(task, &data->o_res.seq_res); 2493 } 2494 2495 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2496 { 2497 struct nfs4_opendata *data = calldata; 2498 2499 data->rpc_status = task->tk_status; 2500 2501 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2502 return; 2503 2504 if (task->tk_status == 0) { 2505 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2506 switch (data->o_res.f_attr->mode & S_IFMT) { 2507 case S_IFREG: 2508 break; 2509 case S_IFLNK: 2510 data->rpc_status = -ELOOP; 2511 break; 2512 case S_IFDIR: 2513 data->rpc_status = -EISDIR; 2514 break; 2515 default: 2516 data->rpc_status = -ENOTDIR; 2517 } 2518 } 2519 renew_lease(data->o_res.server, data->timestamp); 2520 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2521 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2522 } 2523 data->rpc_done = true; 2524 } 2525 2526 static void nfs4_open_release(void *calldata) 2527 { 2528 struct nfs4_opendata *data = calldata; 2529 struct nfs4_state *state = NULL; 2530 2531 /* If this request hasn't been cancelled, do nothing */ 2532 if (!data->cancelled) 2533 goto out_free; 2534 /* In case of error, no cleanup! */ 2535 if (data->rpc_status != 0 || !data->rpc_done) 2536 goto out_free; 2537 /* In case we need an open_confirm, no cleanup! */ 2538 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2539 goto out_free; 2540 state = nfs4_opendata_to_nfs4_state(data); 2541 if (!IS_ERR(state)) 2542 nfs4_close_state(state, data->o_arg.fmode); 2543 out_free: 2544 nfs4_opendata_put(data); 2545 } 2546 2547 static const struct rpc_call_ops nfs4_open_ops = { 2548 .rpc_call_prepare = nfs4_open_prepare, 2549 .rpc_call_done = nfs4_open_done, 2550 .rpc_release = nfs4_open_release, 2551 }; 2552 2553 static int nfs4_run_open_task(struct nfs4_opendata *data, 2554 struct nfs_open_context *ctx) 2555 { 2556 struct inode *dir = d_inode(data->dir); 2557 struct nfs_server *server = NFS_SERVER(dir); 2558 struct nfs_openargs *o_arg = &data->o_arg; 2559 struct nfs_openres *o_res = &data->o_res; 2560 struct rpc_task *task; 2561 struct rpc_message msg = { 2562 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2563 .rpc_argp = o_arg, 2564 .rpc_resp = o_res, 2565 .rpc_cred = data->owner->so_cred, 2566 }; 2567 struct rpc_task_setup task_setup_data = { 2568 .rpc_client = server->client, 2569 .rpc_message = &msg, 2570 .callback_ops = &nfs4_open_ops, 2571 .callback_data = data, 2572 .workqueue = nfsiod_workqueue, 2573 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2574 }; 2575 int status; 2576 2577 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2578 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2579 2580 kref_get(&data->kref); 2581 data->rpc_done = false; 2582 data->rpc_status = 0; 2583 data->cancelled = false; 2584 data->is_recover = false; 2585 if (!ctx) { 2586 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2587 data->is_recover = true; 2588 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2589 } else { 2590 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2591 pnfs_lgopen_prepare(data, ctx); 2592 } 2593 task = rpc_run_task(&task_setup_data); 2594 if (IS_ERR(task)) 2595 return PTR_ERR(task); 2596 status = rpc_wait_for_completion_task(task); 2597 if (status != 0) { 2598 data->cancelled = true; 2599 smp_wmb(); 2600 } else 2601 status = data->rpc_status; 2602 rpc_put_task(task); 2603 2604 return status; 2605 } 2606 2607 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2608 { 2609 struct inode *dir = d_inode(data->dir); 2610 struct nfs_openres *o_res = &data->o_res; 2611 int status; 2612 2613 status = nfs4_run_open_task(data, NULL); 2614 if (status != 0 || !data->rpc_done) 2615 return status; 2616 2617 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2618 2619 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2620 status = _nfs4_proc_open_confirm(data); 2621 2622 return status; 2623 } 2624 2625 /* 2626 * Additional permission checks in order to distinguish between an 2627 * open for read, and an open for execute. This works around the 2628 * fact that NFSv4 OPEN treats read and execute permissions as being 2629 * the same. 2630 * Note that in the non-execute case, we want to turn off permission 2631 * checking if we just created a new file (POSIX open() semantics). 2632 */ 2633 static int nfs4_opendata_access(const struct cred *cred, 2634 struct nfs4_opendata *opendata, 2635 struct nfs4_state *state, fmode_t fmode) 2636 { 2637 struct nfs_access_entry cache; 2638 u32 mask, flags; 2639 2640 /* access call failed or for some reason the server doesn't 2641 * support any access modes -- defer access call until later */ 2642 if (opendata->o_res.access_supported == 0) 2643 return 0; 2644 2645 mask = 0; 2646 if (fmode & FMODE_EXEC) { 2647 /* ONLY check for exec rights */ 2648 if (S_ISDIR(state->inode->i_mode)) 2649 mask = NFS4_ACCESS_LOOKUP; 2650 else 2651 mask = NFS4_ACCESS_EXECUTE; 2652 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2653 mask = NFS4_ACCESS_READ; 2654 2655 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2656 nfs_access_add_cache(state->inode, &cache, cred); 2657 2658 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2659 if ((mask & ~cache.mask & flags) == 0) 2660 return 0; 2661 2662 return -EACCES; 2663 } 2664 2665 /* 2666 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2667 */ 2668 static int _nfs4_proc_open(struct nfs4_opendata *data, 2669 struct nfs_open_context *ctx) 2670 { 2671 struct inode *dir = d_inode(data->dir); 2672 struct nfs_server *server = NFS_SERVER(dir); 2673 struct nfs_openargs *o_arg = &data->o_arg; 2674 struct nfs_openres *o_res = &data->o_res; 2675 int status; 2676 2677 status = nfs4_run_open_task(data, ctx); 2678 if (!data->rpc_done) 2679 return status; 2680 if (status != 0) { 2681 if (status == -NFS4ERR_BADNAME && 2682 !(o_arg->open_flags & O_CREAT)) 2683 return -ENOENT; 2684 return status; 2685 } 2686 2687 nfs_fattr_map_and_free_names(server, &data->f_attr); 2688 2689 if (o_arg->open_flags & O_CREAT) { 2690 if (o_arg->open_flags & O_EXCL) 2691 data->file_created = true; 2692 else if (o_res->cinfo.before != o_res->cinfo.after) 2693 data->file_created = true; 2694 if (data->file_created || 2695 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2696 nfs4_update_changeattr(dir, &o_res->cinfo, 2697 o_res->f_attr->time_start, 2698 NFS_INO_INVALID_DATA); 2699 } 2700 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2701 server->caps &= ~NFS_CAP_POSIX_LOCK; 2702 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2703 status = _nfs4_proc_open_confirm(data); 2704 if (status != 0) 2705 return status; 2706 } 2707 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2708 struct nfs_fh *fh = &o_res->fh; 2709 2710 nfs4_sequence_free_slot(&o_res->seq_res); 2711 if (o_arg->claim == NFS4_OPEN_CLAIM_FH) 2712 fh = NFS_FH(d_inode(data->dentry)); 2713 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL); 2714 } 2715 return 0; 2716 } 2717 2718 /* 2719 * OPEN_EXPIRED: 2720 * reclaim state on the server after a network partition. 2721 * Assumes caller holds the appropriate lock 2722 */ 2723 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2724 { 2725 struct nfs4_opendata *opendata; 2726 int ret; 2727 2728 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2729 if (IS_ERR(opendata)) 2730 return PTR_ERR(opendata); 2731 /* 2732 * We're not recovering a delegation, so ask for no delegation. 2733 * Otherwise the recovery thread could deadlock with an outstanding 2734 * delegation return. 2735 */ 2736 opendata->o_arg.open_flags = O_DIRECT; 2737 ret = nfs4_open_recover(opendata, state); 2738 if (ret == -ESTALE) 2739 d_drop(ctx->dentry); 2740 nfs4_opendata_put(opendata); 2741 return ret; 2742 } 2743 2744 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2745 { 2746 struct nfs_server *server = NFS_SERVER(state->inode); 2747 struct nfs4_exception exception = { }; 2748 int err; 2749 2750 do { 2751 err = _nfs4_open_expired(ctx, state); 2752 trace_nfs4_open_expired(ctx, 0, err); 2753 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2754 continue; 2755 switch (err) { 2756 default: 2757 goto out; 2758 case -NFS4ERR_GRACE: 2759 case -NFS4ERR_DELAY: 2760 nfs4_handle_exception(server, err, &exception); 2761 err = 0; 2762 } 2763 } while (exception.retry); 2764 out: 2765 return err; 2766 } 2767 2768 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2769 { 2770 struct nfs_open_context *ctx; 2771 int ret; 2772 2773 ctx = nfs4_state_find_open_context(state); 2774 if (IS_ERR(ctx)) 2775 return -EAGAIN; 2776 ret = nfs4_do_open_expired(ctx, state); 2777 put_nfs_open_context(ctx); 2778 return ret; 2779 } 2780 2781 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2782 const nfs4_stateid *stateid) 2783 { 2784 nfs_remove_bad_delegation(state->inode, stateid); 2785 nfs_state_clear_delegation(state); 2786 } 2787 2788 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2789 { 2790 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2791 nfs_finish_clear_delegation_stateid(state, NULL); 2792 } 2793 2794 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2795 { 2796 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2797 nfs40_clear_delegation_stateid(state); 2798 nfs_state_clear_open_state_flags(state); 2799 return nfs4_open_expired(sp, state); 2800 } 2801 2802 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2803 nfs4_stateid *stateid, 2804 const struct cred *cred) 2805 { 2806 return -NFS4ERR_BAD_STATEID; 2807 } 2808 2809 #if defined(CONFIG_NFS_V4_1) 2810 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2811 nfs4_stateid *stateid, 2812 const struct cred *cred) 2813 { 2814 int status; 2815 2816 switch (stateid->type) { 2817 default: 2818 break; 2819 case NFS4_INVALID_STATEID_TYPE: 2820 case NFS4_SPECIAL_STATEID_TYPE: 2821 return -NFS4ERR_BAD_STATEID; 2822 case NFS4_REVOKED_STATEID_TYPE: 2823 goto out_free; 2824 } 2825 2826 status = nfs41_test_stateid(server, stateid, cred); 2827 switch (status) { 2828 case -NFS4ERR_EXPIRED: 2829 case -NFS4ERR_ADMIN_REVOKED: 2830 case -NFS4ERR_DELEG_REVOKED: 2831 break; 2832 default: 2833 return status; 2834 } 2835 out_free: 2836 /* Ack the revoked state to the server */ 2837 nfs41_free_stateid(server, stateid, cred, true); 2838 return -NFS4ERR_EXPIRED; 2839 } 2840 2841 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2842 { 2843 struct nfs_server *server = NFS_SERVER(state->inode); 2844 nfs4_stateid stateid; 2845 struct nfs_delegation *delegation; 2846 const struct cred *cred = NULL; 2847 int status, ret = NFS_OK; 2848 2849 /* Get the delegation credential for use by test/free_stateid */ 2850 rcu_read_lock(); 2851 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2852 if (delegation == NULL) { 2853 rcu_read_unlock(); 2854 nfs_state_clear_delegation(state); 2855 return NFS_OK; 2856 } 2857 2858 spin_lock(&delegation->lock); 2859 nfs4_stateid_copy(&stateid, &delegation->stateid); 2860 2861 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2862 &delegation->flags)) { 2863 spin_unlock(&delegation->lock); 2864 rcu_read_unlock(); 2865 return NFS_OK; 2866 } 2867 2868 if (delegation->cred) 2869 cred = get_cred(delegation->cred); 2870 spin_unlock(&delegation->lock); 2871 rcu_read_unlock(); 2872 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2873 trace_nfs4_test_delegation_stateid(state, NULL, status); 2874 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2875 nfs_finish_clear_delegation_stateid(state, &stateid); 2876 else 2877 ret = status; 2878 2879 put_cred(cred); 2880 return ret; 2881 } 2882 2883 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2884 { 2885 nfs4_stateid tmp; 2886 2887 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2888 nfs4_copy_delegation_stateid(state->inode, state->state, 2889 &tmp, NULL) && 2890 nfs4_stateid_match_other(&state->stateid, &tmp)) 2891 nfs_state_set_delegation(state, &tmp, state->state); 2892 else 2893 nfs_state_clear_delegation(state); 2894 } 2895 2896 /** 2897 * nfs41_check_expired_locks - possibly free a lock stateid 2898 * 2899 * @state: NFSv4 state for an inode 2900 * 2901 * Returns NFS_OK if recovery for this stateid is now finished. 2902 * Otherwise a negative NFS4ERR value is returned. 2903 */ 2904 static int nfs41_check_expired_locks(struct nfs4_state *state) 2905 { 2906 int status, ret = NFS_OK; 2907 struct nfs4_lock_state *lsp, *prev = NULL; 2908 struct nfs_server *server = NFS_SERVER(state->inode); 2909 2910 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2911 goto out; 2912 2913 spin_lock(&state->state_lock); 2914 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2915 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2916 const struct cred *cred = lsp->ls_state->owner->so_cred; 2917 2918 refcount_inc(&lsp->ls_count); 2919 spin_unlock(&state->state_lock); 2920 2921 nfs4_put_lock_state(prev); 2922 prev = lsp; 2923 2924 status = nfs41_test_and_free_expired_stateid(server, 2925 &lsp->ls_stateid, 2926 cred); 2927 trace_nfs4_test_lock_stateid(state, lsp, status); 2928 if (status == -NFS4ERR_EXPIRED || 2929 status == -NFS4ERR_BAD_STATEID) { 2930 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2931 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2932 if (!recover_lost_locks) 2933 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2934 } else if (status != NFS_OK) { 2935 ret = status; 2936 nfs4_put_lock_state(prev); 2937 goto out; 2938 } 2939 spin_lock(&state->state_lock); 2940 } 2941 } 2942 spin_unlock(&state->state_lock); 2943 nfs4_put_lock_state(prev); 2944 out: 2945 return ret; 2946 } 2947 2948 /** 2949 * nfs41_check_open_stateid - possibly free an open stateid 2950 * 2951 * @state: NFSv4 state for an inode 2952 * 2953 * Returns NFS_OK if recovery for this stateid is now finished. 2954 * Otherwise a negative NFS4ERR value is returned. 2955 */ 2956 static int nfs41_check_open_stateid(struct nfs4_state *state) 2957 { 2958 struct nfs_server *server = NFS_SERVER(state->inode); 2959 nfs4_stateid *stateid = &state->open_stateid; 2960 const struct cred *cred = state->owner->so_cred; 2961 int status; 2962 2963 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2964 return -NFS4ERR_BAD_STATEID; 2965 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2966 trace_nfs4_test_open_stateid(state, NULL, status); 2967 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2968 nfs_state_clear_open_state_flags(state); 2969 stateid->type = NFS4_INVALID_STATEID_TYPE; 2970 return status; 2971 } 2972 if (nfs_open_stateid_recover_openmode(state)) 2973 return -NFS4ERR_OPENMODE; 2974 return NFS_OK; 2975 } 2976 2977 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2978 { 2979 int status; 2980 2981 status = nfs41_check_delegation_stateid(state); 2982 if (status != NFS_OK) 2983 return status; 2984 nfs41_delegation_recover_stateid(state); 2985 2986 status = nfs41_check_expired_locks(state); 2987 if (status != NFS_OK) 2988 return status; 2989 status = nfs41_check_open_stateid(state); 2990 if (status != NFS_OK) 2991 status = nfs4_open_expired(sp, state); 2992 return status; 2993 } 2994 #endif 2995 2996 /* 2997 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2998 * fields corresponding to attributes that were used to store the verifier. 2999 * Make sure we clobber those fields in the later setattr call 3000 */ 3001 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 3002 struct iattr *sattr, struct nfs4_label **label) 3003 { 3004 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 3005 __u32 attrset[3]; 3006 unsigned ret; 3007 unsigned i; 3008 3009 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3010 attrset[i] = opendata->o_res.attrset[i]; 3011 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3012 attrset[i] &= ~bitmask[i]; 3013 } 3014 3015 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3016 sattr->ia_valid : 0; 3017 3018 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3019 if (sattr->ia_valid & ATTR_ATIME_SET) 3020 ret |= ATTR_ATIME_SET; 3021 else 3022 ret |= ATTR_ATIME; 3023 } 3024 3025 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3026 if (sattr->ia_valid & ATTR_MTIME_SET) 3027 ret |= ATTR_MTIME_SET; 3028 else 3029 ret |= ATTR_MTIME; 3030 } 3031 3032 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3033 *label = NULL; 3034 return ret; 3035 } 3036 3037 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3038 struct nfs_open_context *ctx) 3039 { 3040 struct nfs4_state_owner *sp = opendata->owner; 3041 struct nfs_server *server = sp->so_server; 3042 struct dentry *dentry; 3043 struct nfs4_state *state; 3044 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3045 struct inode *dir = d_inode(opendata->dir); 3046 unsigned long dir_verifier; 3047 unsigned int seq; 3048 int ret; 3049 3050 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3051 dir_verifier = nfs_save_change_attribute(dir); 3052 3053 ret = _nfs4_proc_open(opendata, ctx); 3054 if (ret != 0) 3055 goto out; 3056 3057 state = _nfs4_opendata_to_nfs4_state(opendata); 3058 ret = PTR_ERR(state); 3059 if (IS_ERR(state)) 3060 goto out; 3061 ctx->state = state; 3062 if (server->caps & NFS_CAP_POSIX_LOCK) 3063 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3064 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3065 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3066 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3067 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3068 3069 dentry = opendata->dentry; 3070 if (d_really_is_negative(dentry)) { 3071 struct dentry *alias; 3072 d_drop(dentry); 3073 alias = d_exact_alias(dentry, state->inode); 3074 if (!alias) 3075 alias = d_splice_alias(igrab(state->inode), dentry); 3076 /* d_splice_alias() can't fail here - it's a non-directory */ 3077 if (alias) { 3078 dput(ctx->dentry); 3079 ctx->dentry = dentry = alias; 3080 } 3081 } 3082 3083 switch(opendata->o_arg.claim) { 3084 default: 3085 break; 3086 case NFS4_OPEN_CLAIM_NULL: 3087 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3088 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3089 if (!opendata->rpc_done) 3090 break; 3091 if (opendata->o_res.delegation_type != 0) 3092 dir_verifier = nfs_save_change_attribute(dir); 3093 nfs_set_verifier(dentry, dir_verifier); 3094 } 3095 3096 /* Parse layoutget results before we check for access */ 3097 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3098 3099 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3100 if (ret != 0) 3101 goto out; 3102 3103 if (d_inode(dentry) == state->inode) { 3104 nfs_inode_attach_open_context(ctx); 3105 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3106 nfs4_schedule_stateid_recovery(server, state); 3107 } 3108 3109 out: 3110 if (!opendata->cancelled) { 3111 if (opendata->lgp) { 3112 nfs4_lgopen_release(opendata->lgp); 3113 opendata->lgp = NULL; 3114 } 3115 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3116 } 3117 return ret; 3118 } 3119 3120 /* 3121 * Returns a referenced nfs4_state 3122 */ 3123 static int _nfs4_do_open(struct inode *dir, 3124 struct nfs_open_context *ctx, 3125 int flags, 3126 const struct nfs4_open_createattrs *c, 3127 int *opened) 3128 { 3129 struct nfs4_state_owner *sp; 3130 struct nfs4_state *state = NULL; 3131 struct nfs_server *server = NFS_SERVER(dir); 3132 struct nfs4_opendata *opendata; 3133 struct dentry *dentry = ctx->dentry; 3134 const struct cred *cred = ctx->cred; 3135 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3136 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3137 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3138 struct iattr *sattr = c->sattr; 3139 struct nfs4_label *label = c->label; 3140 int status; 3141 3142 /* Protect against reboot recovery conflicts */ 3143 status = -ENOMEM; 3144 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3145 if (sp == NULL) { 3146 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3147 goto out_err; 3148 } 3149 status = nfs4_client_recover_expired_lease(server->nfs_client); 3150 if (status != 0) 3151 goto err_put_state_owner; 3152 if (d_really_is_positive(dentry)) 3153 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3154 status = -ENOMEM; 3155 if (d_really_is_positive(dentry)) 3156 claim = NFS4_OPEN_CLAIM_FH; 3157 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3158 c, claim, GFP_KERNEL); 3159 if (opendata == NULL) 3160 goto err_put_state_owner; 3161 3162 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3163 if (!opendata->f_attr.mdsthreshold) { 3164 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3165 if (!opendata->f_attr.mdsthreshold) 3166 goto err_opendata_put; 3167 } 3168 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3169 } 3170 if (d_really_is_positive(dentry)) 3171 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3172 3173 status = _nfs4_open_and_get_state(opendata, ctx); 3174 if (status != 0) 3175 goto err_opendata_put; 3176 state = ctx->state; 3177 3178 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3179 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3180 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3181 /* 3182 * send create attributes which was not set by open 3183 * with an extra setattr. 3184 */ 3185 if (attrs || label) { 3186 unsigned ia_old = sattr->ia_valid; 3187 3188 sattr->ia_valid = attrs; 3189 nfs_fattr_init(opendata->o_res.f_attr); 3190 status = nfs4_do_setattr(state->inode, cred, 3191 opendata->o_res.f_attr, sattr, 3192 ctx, label); 3193 if (status == 0) { 3194 nfs_setattr_update_inode(state->inode, sattr, 3195 opendata->o_res.f_attr); 3196 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3197 } 3198 sattr->ia_valid = ia_old; 3199 } 3200 } 3201 if (opened && opendata->file_created) 3202 *opened = 1; 3203 3204 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3205 *ctx_th = opendata->f_attr.mdsthreshold; 3206 opendata->f_attr.mdsthreshold = NULL; 3207 } 3208 3209 nfs4_opendata_put(opendata); 3210 nfs4_put_state_owner(sp); 3211 return 0; 3212 err_opendata_put: 3213 nfs4_opendata_put(opendata); 3214 err_put_state_owner: 3215 nfs4_put_state_owner(sp); 3216 out_err: 3217 return status; 3218 } 3219 3220 3221 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3222 struct nfs_open_context *ctx, 3223 int flags, 3224 struct iattr *sattr, 3225 struct nfs4_label *label, 3226 int *opened) 3227 { 3228 struct nfs_server *server = NFS_SERVER(dir); 3229 struct nfs4_exception exception = { 3230 .interruptible = true, 3231 }; 3232 struct nfs4_state *res; 3233 struct nfs4_open_createattrs c = { 3234 .label = label, 3235 .sattr = sattr, 3236 .verf = { 3237 [0] = (__u32)jiffies, 3238 [1] = (__u32)current->pid, 3239 }, 3240 }; 3241 int status; 3242 3243 do { 3244 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3245 res = ctx->state; 3246 trace_nfs4_open_file(ctx, flags, status); 3247 if (status == 0) 3248 break; 3249 /* NOTE: BAD_SEQID means the server and client disagree about the 3250 * book-keeping w.r.t. state-changing operations 3251 * (OPEN/CLOSE/LOCK/LOCKU...) 3252 * It is actually a sign of a bug on the client or on the server. 3253 * 3254 * If we receive a BAD_SEQID error in the particular case of 3255 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3256 * have unhashed the old state_owner for us, and that we can 3257 * therefore safely retry using a new one. We should still warn 3258 * the user though... 3259 */ 3260 if (status == -NFS4ERR_BAD_SEQID) { 3261 pr_warn_ratelimited("NFS: v4 server %s " 3262 " returned a bad sequence-id error!\n", 3263 NFS_SERVER(dir)->nfs_client->cl_hostname); 3264 exception.retry = 1; 3265 continue; 3266 } 3267 /* 3268 * BAD_STATEID on OPEN means that the server cancelled our 3269 * state before it received the OPEN_CONFIRM. 3270 * Recover by retrying the request as per the discussion 3271 * on Page 181 of RFC3530. 3272 */ 3273 if (status == -NFS4ERR_BAD_STATEID) { 3274 exception.retry = 1; 3275 continue; 3276 } 3277 if (status == -NFS4ERR_EXPIRED) { 3278 nfs4_schedule_lease_recovery(server->nfs_client); 3279 exception.retry = 1; 3280 continue; 3281 } 3282 if (status == -EAGAIN) { 3283 /* We must have found a delegation */ 3284 exception.retry = 1; 3285 continue; 3286 } 3287 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3288 continue; 3289 res = ERR_PTR(nfs4_handle_exception(server, 3290 status, &exception)); 3291 } while (exception.retry); 3292 return res; 3293 } 3294 3295 static int _nfs4_do_setattr(struct inode *inode, 3296 struct nfs_setattrargs *arg, 3297 struct nfs_setattrres *res, 3298 const struct cred *cred, 3299 struct nfs_open_context *ctx) 3300 { 3301 struct nfs_server *server = NFS_SERVER(inode); 3302 struct rpc_message msg = { 3303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3304 .rpc_argp = arg, 3305 .rpc_resp = res, 3306 .rpc_cred = cred, 3307 }; 3308 const struct cred *delegation_cred = NULL; 3309 unsigned long timestamp = jiffies; 3310 bool truncate; 3311 int status; 3312 3313 nfs_fattr_init(res->fattr); 3314 3315 /* Servers should only apply open mode checks for file size changes */ 3316 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3317 if (!truncate) { 3318 nfs4_inode_make_writeable(inode); 3319 goto zero_stateid; 3320 } 3321 3322 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3323 /* Use that stateid */ 3324 } else if (ctx != NULL && ctx->state) { 3325 struct nfs_lock_context *l_ctx; 3326 if (!nfs4_valid_open_stateid(ctx->state)) 3327 return -EBADF; 3328 l_ctx = nfs_get_lock_context(ctx); 3329 if (IS_ERR(l_ctx)) 3330 return PTR_ERR(l_ctx); 3331 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3332 &arg->stateid, &delegation_cred); 3333 nfs_put_lock_context(l_ctx); 3334 if (status == -EIO) 3335 return -EBADF; 3336 else if (status == -EAGAIN) 3337 goto zero_stateid; 3338 } else { 3339 zero_stateid: 3340 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3341 } 3342 if (delegation_cred) 3343 msg.rpc_cred = delegation_cred; 3344 3345 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3346 3347 put_cred(delegation_cred); 3348 if (status == 0 && ctx != NULL) 3349 renew_lease(server, timestamp); 3350 trace_nfs4_setattr(inode, &arg->stateid, status); 3351 return status; 3352 } 3353 3354 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3355 struct nfs_fattr *fattr, struct iattr *sattr, 3356 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3357 { 3358 struct nfs_server *server = NFS_SERVER(inode); 3359 __u32 bitmask[NFS4_BITMASK_SZ]; 3360 struct nfs4_state *state = ctx ? ctx->state : NULL; 3361 struct nfs_setattrargs arg = { 3362 .fh = NFS_FH(inode), 3363 .iap = sattr, 3364 .server = server, 3365 .bitmask = bitmask, 3366 .label = ilabel, 3367 }; 3368 struct nfs_setattrres res = { 3369 .fattr = fattr, 3370 .server = server, 3371 }; 3372 struct nfs4_exception exception = { 3373 .state = state, 3374 .inode = inode, 3375 .stateid = &arg.stateid, 3376 }; 3377 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3378 int err; 3379 3380 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3381 adjust_flags |= NFS_INO_INVALID_MODE; 3382 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3383 adjust_flags |= NFS_INO_INVALID_OTHER; 3384 3385 do { 3386 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3387 inode, adjust_flags); 3388 3389 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3390 switch (err) { 3391 case -NFS4ERR_OPENMODE: 3392 if (!(sattr->ia_valid & ATTR_SIZE)) { 3393 pr_warn_once("NFSv4: server %s is incorrectly " 3394 "applying open mode checks to " 3395 "a SETATTR that is not " 3396 "changing file size.\n", 3397 server->nfs_client->cl_hostname); 3398 } 3399 if (state && !(state->state & FMODE_WRITE)) { 3400 err = -EBADF; 3401 if (sattr->ia_valid & ATTR_OPEN) 3402 err = -EACCES; 3403 goto out; 3404 } 3405 } 3406 err = nfs4_handle_exception(server, err, &exception); 3407 } while (exception.retry); 3408 out: 3409 return err; 3410 } 3411 3412 static bool 3413 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3414 { 3415 if (inode == NULL || !nfs_have_layout(inode)) 3416 return false; 3417 3418 return pnfs_wait_on_layoutreturn(inode, task); 3419 } 3420 3421 /* 3422 * Update the seqid of an open stateid 3423 */ 3424 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3425 struct nfs4_state *state) 3426 { 3427 __be32 seqid_open; 3428 u32 dst_seqid; 3429 int seq; 3430 3431 for (;;) { 3432 if (!nfs4_valid_open_stateid(state)) 3433 break; 3434 seq = read_seqbegin(&state->seqlock); 3435 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3436 nfs4_stateid_copy(dst, &state->open_stateid); 3437 if (read_seqretry(&state->seqlock, seq)) 3438 continue; 3439 break; 3440 } 3441 seqid_open = state->open_stateid.seqid; 3442 if (read_seqretry(&state->seqlock, seq)) 3443 continue; 3444 3445 dst_seqid = be32_to_cpu(dst->seqid); 3446 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3447 dst->seqid = seqid_open; 3448 break; 3449 } 3450 } 3451 3452 /* 3453 * Update the seqid of an open stateid after receiving 3454 * NFS4ERR_OLD_STATEID 3455 */ 3456 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3457 struct nfs4_state *state) 3458 { 3459 __be32 seqid_open; 3460 u32 dst_seqid; 3461 bool ret; 3462 int seq, status = -EAGAIN; 3463 DEFINE_WAIT(wait); 3464 3465 for (;;) { 3466 ret = false; 3467 if (!nfs4_valid_open_stateid(state)) 3468 break; 3469 seq = read_seqbegin(&state->seqlock); 3470 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3471 if (read_seqretry(&state->seqlock, seq)) 3472 continue; 3473 break; 3474 } 3475 3476 write_seqlock(&state->seqlock); 3477 seqid_open = state->open_stateid.seqid; 3478 3479 dst_seqid = be32_to_cpu(dst->seqid); 3480 3481 /* Did another OPEN bump the state's seqid? try again: */ 3482 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3483 dst->seqid = seqid_open; 3484 write_sequnlock(&state->seqlock); 3485 ret = true; 3486 break; 3487 } 3488 3489 /* server says we're behind but we haven't seen the update yet */ 3490 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3491 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3492 write_sequnlock(&state->seqlock); 3493 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3494 3495 if (fatal_signal_pending(current)) 3496 status = -EINTR; 3497 else 3498 if (schedule_timeout(5*HZ) != 0) 3499 status = 0; 3500 3501 finish_wait(&state->waitq, &wait); 3502 3503 if (!status) 3504 continue; 3505 if (status == -EINTR) 3506 break; 3507 3508 /* we slept the whole 5 seconds, we must have lost a seqid */ 3509 dst->seqid = cpu_to_be32(dst_seqid + 1); 3510 ret = true; 3511 break; 3512 } 3513 3514 return ret; 3515 } 3516 3517 struct nfs4_closedata { 3518 struct inode *inode; 3519 struct nfs4_state *state; 3520 struct nfs_closeargs arg; 3521 struct nfs_closeres res; 3522 struct { 3523 struct nfs4_layoutreturn_args arg; 3524 struct nfs4_layoutreturn_res res; 3525 struct nfs4_xdr_opaque_data ld_private; 3526 u32 roc_barrier; 3527 bool roc; 3528 } lr; 3529 struct nfs_fattr fattr; 3530 unsigned long timestamp; 3531 }; 3532 3533 static void nfs4_free_closedata(void *data) 3534 { 3535 struct nfs4_closedata *calldata = data; 3536 struct nfs4_state_owner *sp = calldata->state->owner; 3537 struct super_block *sb = calldata->state->inode->i_sb; 3538 3539 if (calldata->lr.roc) 3540 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3541 calldata->res.lr_ret); 3542 nfs4_put_open_state(calldata->state); 3543 nfs_free_seqid(calldata->arg.seqid); 3544 nfs4_put_state_owner(sp); 3545 nfs_sb_deactive(sb); 3546 kfree(calldata); 3547 } 3548 3549 static void nfs4_close_done(struct rpc_task *task, void *data) 3550 { 3551 struct nfs4_closedata *calldata = data; 3552 struct nfs4_state *state = calldata->state; 3553 struct nfs_server *server = NFS_SERVER(calldata->inode); 3554 nfs4_stateid *res_stateid = NULL; 3555 struct nfs4_exception exception = { 3556 .state = state, 3557 .inode = calldata->inode, 3558 .stateid = &calldata->arg.stateid, 3559 }; 3560 3561 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3562 return; 3563 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3564 3565 /* Handle Layoutreturn errors */ 3566 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3567 &calldata->res.lr_ret) == -EAGAIN) 3568 goto out_restart; 3569 3570 /* hmm. we are done with the inode, and in the process of freeing 3571 * the state_owner. we keep this around to process errors 3572 */ 3573 switch (task->tk_status) { 3574 case 0: 3575 res_stateid = &calldata->res.stateid; 3576 renew_lease(server, calldata->timestamp); 3577 break; 3578 case -NFS4ERR_ACCESS: 3579 if (calldata->arg.bitmask != NULL) { 3580 calldata->arg.bitmask = NULL; 3581 calldata->res.fattr = NULL; 3582 goto out_restart; 3583 3584 } 3585 break; 3586 case -NFS4ERR_OLD_STATEID: 3587 /* Did we race with OPEN? */ 3588 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3589 state)) 3590 goto out_restart; 3591 goto out_release; 3592 case -NFS4ERR_ADMIN_REVOKED: 3593 case -NFS4ERR_STALE_STATEID: 3594 case -NFS4ERR_EXPIRED: 3595 nfs4_free_revoked_stateid(server, 3596 &calldata->arg.stateid, 3597 task->tk_msg.rpc_cred); 3598 fallthrough; 3599 case -NFS4ERR_BAD_STATEID: 3600 if (calldata->arg.fmode == 0) 3601 break; 3602 fallthrough; 3603 default: 3604 task->tk_status = nfs4_async_handle_exception(task, 3605 server, task->tk_status, &exception); 3606 if (exception.retry) 3607 goto out_restart; 3608 } 3609 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3610 res_stateid, calldata->arg.fmode); 3611 out_release: 3612 task->tk_status = 0; 3613 nfs_release_seqid(calldata->arg.seqid); 3614 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3615 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3616 return; 3617 out_restart: 3618 task->tk_status = 0; 3619 rpc_restart_call_prepare(task); 3620 goto out_release; 3621 } 3622 3623 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3624 { 3625 struct nfs4_closedata *calldata = data; 3626 struct nfs4_state *state = calldata->state; 3627 struct inode *inode = calldata->inode; 3628 struct nfs_server *server = NFS_SERVER(inode); 3629 struct pnfs_layout_hdr *lo; 3630 bool is_rdonly, is_wronly, is_rdwr; 3631 int call_close = 0; 3632 3633 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3634 goto out_wait; 3635 3636 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3637 spin_lock(&state->owner->so_lock); 3638 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3639 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3640 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3641 /* Calculate the change in open mode */ 3642 calldata->arg.fmode = 0; 3643 if (state->n_rdwr == 0) { 3644 if (state->n_rdonly == 0) 3645 call_close |= is_rdonly; 3646 else if (is_rdonly) 3647 calldata->arg.fmode |= FMODE_READ; 3648 if (state->n_wronly == 0) 3649 call_close |= is_wronly; 3650 else if (is_wronly) 3651 calldata->arg.fmode |= FMODE_WRITE; 3652 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3653 call_close |= is_rdwr; 3654 } else if (is_rdwr) 3655 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3656 3657 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3658 if (!nfs4_valid_open_stateid(state)) 3659 call_close = 0; 3660 spin_unlock(&state->owner->so_lock); 3661 3662 if (!call_close) { 3663 /* Note: exit _without_ calling nfs4_close_done */ 3664 goto out_no_action; 3665 } 3666 3667 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3668 nfs_release_seqid(calldata->arg.seqid); 3669 goto out_wait; 3670 } 3671 3672 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3673 if (lo && !pnfs_layout_is_valid(lo)) { 3674 calldata->arg.lr_args = NULL; 3675 calldata->res.lr_res = NULL; 3676 } 3677 3678 if (calldata->arg.fmode == 0) 3679 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3680 3681 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3682 /* Close-to-open cache consistency revalidation */ 3683 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3684 nfs4_bitmask_set(calldata->arg.bitmask_store, 3685 server->cache_consistency_bitmask, 3686 inode, 0); 3687 calldata->arg.bitmask = calldata->arg.bitmask_store; 3688 } else 3689 calldata->arg.bitmask = NULL; 3690 } 3691 3692 calldata->arg.share_access = 3693 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3694 calldata->arg.fmode, 0); 3695 3696 if (calldata->res.fattr == NULL) 3697 calldata->arg.bitmask = NULL; 3698 else if (calldata->arg.bitmask == NULL) 3699 calldata->res.fattr = NULL; 3700 calldata->timestamp = jiffies; 3701 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3702 &calldata->arg.seq_args, 3703 &calldata->res.seq_res, 3704 task) != 0) 3705 nfs_release_seqid(calldata->arg.seqid); 3706 return; 3707 out_no_action: 3708 task->tk_action = NULL; 3709 out_wait: 3710 nfs4_sequence_done(task, &calldata->res.seq_res); 3711 } 3712 3713 static const struct rpc_call_ops nfs4_close_ops = { 3714 .rpc_call_prepare = nfs4_close_prepare, 3715 .rpc_call_done = nfs4_close_done, 3716 .rpc_release = nfs4_free_closedata, 3717 }; 3718 3719 /* 3720 * It is possible for data to be read/written from a mem-mapped file 3721 * after the sys_close call (which hits the vfs layer as a flush). 3722 * This means that we can't safely call nfsv4 close on a file until 3723 * the inode is cleared. This in turn means that we are not good 3724 * NFSv4 citizens - we do not indicate to the server to update the file's 3725 * share state even when we are done with one of the three share 3726 * stateid's in the inode. 3727 * 3728 * NOTE: Caller must be holding the sp->so_owner semaphore! 3729 */ 3730 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3731 { 3732 struct nfs_server *server = NFS_SERVER(state->inode); 3733 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3734 struct nfs4_closedata *calldata; 3735 struct nfs4_state_owner *sp = state->owner; 3736 struct rpc_task *task; 3737 struct rpc_message msg = { 3738 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3739 .rpc_cred = state->owner->so_cred, 3740 }; 3741 struct rpc_task_setup task_setup_data = { 3742 .rpc_client = server->client, 3743 .rpc_message = &msg, 3744 .callback_ops = &nfs4_close_ops, 3745 .workqueue = nfsiod_workqueue, 3746 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3747 }; 3748 int status = -ENOMEM; 3749 3750 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3751 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3752 3753 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3754 &task_setup_data.rpc_client, &msg); 3755 3756 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3757 if (calldata == NULL) 3758 goto out; 3759 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3760 calldata->inode = state->inode; 3761 calldata->state = state; 3762 calldata->arg.fh = NFS_FH(state->inode); 3763 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3764 goto out_free_calldata; 3765 /* Serialization for the sequence id */ 3766 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3767 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3768 if (IS_ERR(calldata->arg.seqid)) 3769 goto out_free_calldata; 3770 nfs_fattr_init(&calldata->fattr); 3771 calldata->arg.fmode = 0; 3772 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3773 calldata->res.fattr = &calldata->fattr; 3774 calldata->res.seqid = calldata->arg.seqid; 3775 calldata->res.server = server; 3776 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3777 calldata->lr.roc = pnfs_roc(state->inode, 3778 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3779 if (calldata->lr.roc) { 3780 calldata->arg.lr_args = &calldata->lr.arg; 3781 calldata->res.lr_res = &calldata->lr.res; 3782 } 3783 nfs_sb_active(calldata->inode->i_sb); 3784 3785 msg.rpc_argp = &calldata->arg; 3786 msg.rpc_resp = &calldata->res; 3787 task_setup_data.callback_data = calldata; 3788 task = rpc_run_task(&task_setup_data); 3789 if (IS_ERR(task)) 3790 return PTR_ERR(task); 3791 status = 0; 3792 if (wait) 3793 status = rpc_wait_for_completion_task(task); 3794 rpc_put_task(task); 3795 return status; 3796 out_free_calldata: 3797 kfree(calldata); 3798 out: 3799 nfs4_put_open_state(state); 3800 nfs4_put_state_owner(sp); 3801 return status; 3802 } 3803 3804 static struct inode * 3805 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3806 int open_flags, struct iattr *attr, int *opened) 3807 { 3808 struct nfs4_state *state; 3809 struct nfs4_label l, *label; 3810 3811 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3812 3813 /* Protect against concurrent sillydeletes */ 3814 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3815 3816 nfs4_label_release_security(label); 3817 3818 if (IS_ERR(state)) 3819 return ERR_CAST(state); 3820 return state->inode; 3821 } 3822 3823 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3824 { 3825 if (ctx->state == NULL) 3826 return; 3827 if (is_sync) 3828 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3829 else 3830 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3831 } 3832 3833 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3834 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3835 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3836 3837 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3838 { 3839 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3840 struct nfs4_server_caps_arg args = { 3841 .fhandle = fhandle, 3842 .bitmask = bitmask, 3843 }; 3844 struct nfs4_server_caps_res res = {}; 3845 struct rpc_message msg = { 3846 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3847 .rpc_argp = &args, 3848 .rpc_resp = &res, 3849 }; 3850 int status; 3851 int i; 3852 3853 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3854 FATTR4_WORD0_FH_EXPIRE_TYPE | 3855 FATTR4_WORD0_LINK_SUPPORT | 3856 FATTR4_WORD0_SYMLINK_SUPPORT | 3857 FATTR4_WORD0_ACLSUPPORT | 3858 FATTR4_WORD0_CASE_INSENSITIVE | 3859 FATTR4_WORD0_CASE_PRESERVING; 3860 if (minorversion) 3861 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3862 3863 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3864 if (status == 0) { 3865 /* Sanity check the server answers */ 3866 switch (minorversion) { 3867 case 0: 3868 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3869 res.attr_bitmask[2] = 0; 3870 break; 3871 case 1: 3872 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3873 break; 3874 case 2: 3875 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3876 } 3877 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3878 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3879 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3880 server->fattr_valid = NFS_ATTR_FATTR_V4; 3881 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3882 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3883 server->caps |= NFS_CAP_ACLS; 3884 if (res.has_links != 0) 3885 server->caps |= NFS_CAP_HARDLINKS; 3886 if (res.has_symlinks != 0) 3887 server->caps |= NFS_CAP_SYMLINKS; 3888 if (res.case_insensitive) 3889 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3890 if (res.case_preserving) 3891 server->caps |= NFS_CAP_CASE_PRESERVING; 3892 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3893 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3894 server->caps |= NFS_CAP_SECURITY_LABEL; 3895 #endif 3896 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3897 server->caps |= NFS_CAP_FS_LOCATIONS; 3898 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3899 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3901 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3902 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3903 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3905 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3906 NFS_ATTR_FATTR_OWNER_NAME); 3907 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3908 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3909 NFS_ATTR_FATTR_GROUP_NAME); 3910 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3911 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3912 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3913 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3914 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3915 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3916 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3917 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3918 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3919 sizeof(server->attr_bitmask)); 3920 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3921 3922 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3923 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3924 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3925 server->cache_consistency_bitmask[2] = 0; 3926 3927 /* Avoid a regression due to buggy server */ 3928 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3929 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3930 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3931 sizeof(server->exclcreat_bitmask)); 3932 3933 server->acl_bitmask = res.acl_bitmask; 3934 server->fh_expire_type = res.fh_expire_type; 3935 } 3936 3937 return status; 3938 } 3939 3940 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3941 { 3942 struct nfs4_exception exception = { 3943 .interruptible = true, 3944 }; 3945 int err; 3946 3947 nfs4_server_set_init_caps(server); 3948 do { 3949 err = nfs4_handle_exception(server, 3950 _nfs4_server_capabilities(server, fhandle), 3951 &exception); 3952 } while (exception.retry); 3953 return err; 3954 } 3955 3956 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3957 struct nfs_client *clp, 3958 struct nfs_server *server) 3959 { 3960 int i; 3961 3962 for (i = 0; i < location->nservers; i++) { 3963 struct nfs4_string *srv_loc = &location->servers[i]; 3964 struct sockaddr_storage addr; 3965 size_t addrlen; 3966 struct xprt_create xprt_args = { 3967 .ident = 0, 3968 .net = clp->cl_net, 3969 }; 3970 struct nfs4_add_xprt_data xprtdata = { 3971 .clp = clp, 3972 }; 3973 struct rpc_add_xprt_test rpcdata = { 3974 .add_xprt_test = clp->cl_mvops->session_trunk, 3975 .data = &xprtdata, 3976 }; 3977 char *servername = NULL; 3978 3979 if (!srv_loc->len) 3980 continue; 3981 3982 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3983 &addr, sizeof(addr), 3984 clp->cl_net, server->port); 3985 if (!addrlen) 3986 return; 3987 xprt_args.dstaddr = (struct sockaddr *)&addr; 3988 xprt_args.addrlen = addrlen; 3989 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3990 if (!servername) 3991 return; 3992 memcpy(servername, srv_loc->data, srv_loc->len); 3993 servername[srv_loc->len] = '\0'; 3994 xprt_args.servername = servername; 3995 3996 xprtdata.cred = nfs4_get_clid_cred(clp); 3997 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3998 rpc_clnt_setup_test_and_add_xprt, 3999 &rpcdata); 4000 if (xprtdata.cred) 4001 put_cred(xprtdata.cred); 4002 kfree(servername); 4003 } 4004 } 4005 4006 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1, 4007 struct nfs4_pathname *path2) 4008 { 4009 int i; 4010 4011 if (path1->ncomponents != path2->ncomponents) 4012 return false; 4013 for (i = 0; i < path1->ncomponents; i++) { 4014 if (path1->components[i].len != path2->components[i].len) 4015 return false; 4016 if (memcmp(path1->components[i].data, path2->components[i].data, 4017 path1->components[i].len)) 4018 return false; 4019 } 4020 return true; 4021 } 4022 4023 static int _nfs4_discover_trunking(struct nfs_server *server, 4024 struct nfs_fh *fhandle) 4025 { 4026 struct nfs4_fs_locations *locations = NULL; 4027 struct page *page; 4028 const struct cred *cred; 4029 struct nfs_client *clp = server->nfs_client; 4030 const struct nfs4_state_maintenance_ops *ops = 4031 clp->cl_mvops->state_renewal_ops; 4032 int status = -ENOMEM, i; 4033 4034 cred = ops->get_state_renewal_cred(clp); 4035 if (cred == NULL) { 4036 cred = nfs4_get_clid_cred(clp); 4037 if (cred == NULL) 4038 return -ENOKEY; 4039 } 4040 4041 page = alloc_page(GFP_KERNEL); 4042 if (!page) 4043 goto out_put_cred; 4044 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4045 if (!locations) 4046 goto out_free; 4047 locations->fattr = nfs_alloc_fattr(); 4048 if (!locations->fattr) 4049 goto out_free_2; 4050 4051 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4052 cred); 4053 if (status) 4054 goto out_free_3; 4055 4056 for (i = 0; i < locations->nlocations; i++) { 4057 if (!_is_same_nfs4_pathname(&locations->fs_path, 4058 &locations->locations[i].rootpath)) 4059 continue; 4060 test_fs_location_for_trunking(&locations->locations[i], clp, 4061 server); 4062 } 4063 out_free_3: 4064 kfree(locations->fattr); 4065 out_free_2: 4066 kfree(locations); 4067 out_free: 4068 __free_page(page); 4069 out_put_cred: 4070 put_cred(cred); 4071 return status; 4072 } 4073 4074 static int nfs4_discover_trunking(struct nfs_server *server, 4075 struct nfs_fh *fhandle) 4076 { 4077 struct nfs4_exception exception = { 4078 .interruptible = true, 4079 }; 4080 struct nfs_client *clp = server->nfs_client; 4081 int err = 0; 4082 4083 if (!nfs4_has_session(clp)) 4084 goto out; 4085 do { 4086 err = nfs4_handle_exception(server, 4087 _nfs4_discover_trunking(server, fhandle), 4088 &exception); 4089 } while (exception.retry); 4090 out: 4091 return err; 4092 } 4093 4094 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4095 struct nfs_fsinfo *info) 4096 { 4097 u32 bitmask[3]; 4098 struct nfs4_lookup_root_arg args = { 4099 .bitmask = bitmask, 4100 }; 4101 struct nfs4_lookup_res res = { 4102 .server = server, 4103 .fattr = info->fattr, 4104 .fh = fhandle, 4105 }; 4106 struct rpc_message msg = { 4107 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4108 .rpc_argp = &args, 4109 .rpc_resp = &res, 4110 }; 4111 4112 bitmask[0] = nfs4_fattr_bitmap[0]; 4113 bitmask[1] = nfs4_fattr_bitmap[1]; 4114 /* 4115 * Process the label in the upcoming getfattr 4116 */ 4117 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4118 4119 nfs_fattr_init(info->fattr); 4120 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4121 } 4122 4123 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4124 struct nfs_fsinfo *info) 4125 { 4126 struct nfs4_exception exception = { 4127 .interruptible = true, 4128 }; 4129 int err; 4130 do { 4131 err = _nfs4_lookup_root(server, fhandle, info); 4132 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4133 switch (err) { 4134 case 0: 4135 case -NFS4ERR_WRONGSEC: 4136 goto out; 4137 default: 4138 err = nfs4_handle_exception(server, err, &exception); 4139 } 4140 } while (exception.retry); 4141 out: 4142 return err; 4143 } 4144 4145 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4146 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4147 { 4148 struct rpc_auth_create_args auth_args = { 4149 .pseudoflavor = flavor, 4150 }; 4151 struct rpc_auth *auth; 4152 4153 auth = rpcauth_create(&auth_args, server->client); 4154 if (IS_ERR(auth)) 4155 return -EACCES; 4156 return nfs4_lookup_root(server, fhandle, info); 4157 } 4158 4159 /* 4160 * Retry pseudoroot lookup with various security flavors. We do this when: 4161 * 4162 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4163 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4164 * 4165 * Returns zero on success, or a negative NFS4ERR value, or a 4166 * negative errno value. 4167 */ 4168 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4169 struct nfs_fsinfo *info) 4170 { 4171 /* Per 3530bis 15.33.5 */ 4172 static const rpc_authflavor_t flav_array[] = { 4173 RPC_AUTH_GSS_KRB5P, 4174 RPC_AUTH_GSS_KRB5I, 4175 RPC_AUTH_GSS_KRB5, 4176 RPC_AUTH_UNIX, /* courtesy */ 4177 RPC_AUTH_NULL, 4178 }; 4179 int status = -EPERM; 4180 size_t i; 4181 4182 if (server->auth_info.flavor_len > 0) { 4183 /* try each flavor specified by user */ 4184 for (i = 0; i < server->auth_info.flavor_len; i++) { 4185 status = nfs4_lookup_root_sec(server, fhandle, info, 4186 server->auth_info.flavors[i]); 4187 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4188 continue; 4189 break; 4190 } 4191 } else { 4192 /* no flavors specified by user, try default list */ 4193 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4194 status = nfs4_lookup_root_sec(server, fhandle, info, 4195 flav_array[i]); 4196 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4197 continue; 4198 break; 4199 } 4200 } 4201 4202 /* 4203 * -EACCES could mean that the user doesn't have correct permissions 4204 * to access the mount. It could also mean that we tried to mount 4205 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4206 * existing mount programs don't handle -EACCES very well so it should 4207 * be mapped to -EPERM instead. 4208 */ 4209 if (status == -EACCES) 4210 status = -EPERM; 4211 return status; 4212 } 4213 4214 /** 4215 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4216 * @server: initialized nfs_server handle 4217 * @fhandle: we fill in the pseudo-fs root file handle 4218 * @info: we fill in an FSINFO struct 4219 * @auth_probe: probe the auth flavours 4220 * 4221 * Returns zero on success, or a negative errno. 4222 */ 4223 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4224 struct nfs_fsinfo *info, 4225 bool auth_probe) 4226 { 4227 int status = 0; 4228 4229 if (!auth_probe) 4230 status = nfs4_lookup_root(server, fhandle, info); 4231 4232 if (auth_probe || status == NFS4ERR_WRONGSEC) 4233 status = server->nfs_client->cl_mvops->find_root_sec(server, 4234 fhandle, info); 4235 4236 if (status == 0) 4237 status = nfs4_server_capabilities(server, fhandle); 4238 if (status == 0) 4239 status = nfs4_do_fsinfo(server, fhandle, info); 4240 4241 return nfs4_map_errors(status); 4242 } 4243 4244 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4245 struct nfs_fsinfo *info) 4246 { 4247 int error; 4248 struct nfs_fattr *fattr = info->fattr; 4249 4250 error = nfs4_server_capabilities(server, mntfh); 4251 if (error < 0) { 4252 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4253 return error; 4254 } 4255 4256 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4257 if (error < 0) { 4258 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4259 goto out; 4260 } 4261 4262 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4263 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4264 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4265 4266 out: 4267 return error; 4268 } 4269 4270 /* 4271 * Get locations and (maybe) other attributes of a referral. 4272 * Note that we'll actually follow the referral later when 4273 * we detect fsid mismatch in inode revalidation 4274 */ 4275 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4276 const struct qstr *name, struct nfs_fattr *fattr, 4277 struct nfs_fh *fhandle) 4278 { 4279 int status = -ENOMEM; 4280 struct page *page = NULL; 4281 struct nfs4_fs_locations *locations = NULL; 4282 4283 page = alloc_page(GFP_KERNEL); 4284 if (page == NULL) 4285 goto out; 4286 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4287 if (locations == NULL) 4288 goto out; 4289 4290 locations->fattr = fattr; 4291 4292 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4293 if (status != 0) 4294 goto out; 4295 4296 /* 4297 * If the fsid didn't change, this is a migration event, not a 4298 * referral. Cause us to drop into the exception handler, which 4299 * will kick off migration recovery. 4300 */ 4301 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4302 dprintk("%s: server did not return a different fsid for" 4303 " a referral at %s\n", __func__, name->name); 4304 status = -NFS4ERR_MOVED; 4305 goto out; 4306 } 4307 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4308 nfs_fixup_referral_attributes(fattr); 4309 memset(fhandle, 0, sizeof(struct nfs_fh)); 4310 out: 4311 if (page) 4312 __free_page(page); 4313 kfree(locations); 4314 return status; 4315 } 4316 4317 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4318 struct nfs_fattr *fattr, struct inode *inode) 4319 { 4320 __u32 bitmask[NFS4_BITMASK_SZ]; 4321 struct nfs4_getattr_arg args = { 4322 .fh = fhandle, 4323 .bitmask = bitmask, 4324 }; 4325 struct nfs4_getattr_res res = { 4326 .fattr = fattr, 4327 .server = server, 4328 }; 4329 struct rpc_message msg = { 4330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4331 .rpc_argp = &args, 4332 .rpc_resp = &res, 4333 }; 4334 unsigned short task_flags = 0; 4335 4336 if (nfs4_has_session(server->nfs_client)) 4337 task_flags = RPC_TASK_MOVEABLE; 4338 4339 /* Is this is an attribute revalidation, subject to softreval? */ 4340 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4341 task_flags |= RPC_TASK_TIMEOUT; 4342 4343 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4344 nfs_fattr_init(fattr); 4345 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4346 return nfs4_do_call_sync(server->client, server, &msg, 4347 &args.seq_args, &res.seq_res, task_flags); 4348 } 4349 4350 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4351 struct nfs_fattr *fattr, struct inode *inode) 4352 { 4353 struct nfs4_exception exception = { 4354 .interruptible = true, 4355 }; 4356 int err; 4357 do { 4358 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4359 trace_nfs4_getattr(server, fhandle, fattr, err); 4360 err = nfs4_handle_exception(server, err, 4361 &exception); 4362 } while (exception.retry); 4363 return err; 4364 } 4365 4366 /* 4367 * The file is not closed if it is opened due to the a request to change 4368 * the size of the file. The open call will not be needed once the 4369 * VFS layer lookup-intents are implemented. 4370 * 4371 * Close is called when the inode is destroyed. 4372 * If we haven't opened the file for O_WRONLY, we 4373 * need to in the size_change case to obtain a stateid. 4374 * 4375 * Got race? 4376 * Because OPEN is always done by name in nfsv4, it is 4377 * possible that we opened a different file by the same 4378 * name. We can recognize this race condition, but we 4379 * can't do anything about it besides returning an error. 4380 * 4381 * This will be fixed with VFS changes (lookup-intent). 4382 */ 4383 static int 4384 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4385 struct iattr *sattr) 4386 { 4387 struct inode *inode = d_inode(dentry); 4388 const struct cred *cred = NULL; 4389 struct nfs_open_context *ctx = NULL; 4390 int status; 4391 4392 if (pnfs_ld_layoutret_on_setattr(inode) && 4393 sattr->ia_valid & ATTR_SIZE && 4394 sattr->ia_size < i_size_read(inode)) 4395 pnfs_commit_and_return_layout(inode); 4396 4397 nfs_fattr_init(fattr); 4398 4399 /* Deal with open(O_TRUNC) */ 4400 if (sattr->ia_valid & ATTR_OPEN) 4401 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4402 4403 /* Optimization: if the end result is no change, don't RPC */ 4404 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4405 return 0; 4406 4407 /* Search for an existing open(O_WRITE) file */ 4408 if (sattr->ia_valid & ATTR_FILE) { 4409 4410 ctx = nfs_file_open_context(sattr->ia_file); 4411 if (ctx) 4412 cred = ctx->cred; 4413 } 4414 4415 /* Return any delegations if we're going to change ACLs */ 4416 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4417 nfs4_inode_make_writeable(inode); 4418 4419 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4420 if (status == 0) { 4421 nfs_setattr_update_inode(inode, sattr, fattr); 4422 nfs_setsecurity(inode, fattr); 4423 } 4424 return status; 4425 } 4426 4427 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4428 struct dentry *dentry, struct nfs_fh *fhandle, 4429 struct nfs_fattr *fattr) 4430 { 4431 struct nfs_server *server = NFS_SERVER(dir); 4432 int status; 4433 struct nfs4_lookup_arg args = { 4434 .bitmask = server->attr_bitmask, 4435 .dir_fh = NFS_FH(dir), 4436 .name = &dentry->d_name, 4437 }; 4438 struct nfs4_lookup_res res = { 4439 .server = server, 4440 .fattr = fattr, 4441 .fh = fhandle, 4442 }; 4443 struct rpc_message msg = { 4444 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4445 .rpc_argp = &args, 4446 .rpc_resp = &res, 4447 }; 4448 unsigned short task_flags = 0; 4449 4450 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4451 task_flags = RPC_TASK_MOVEABLE; 4452 4453 /* Is this is an attribute revalidation, subject to softreval? */ 4454 if (nfs_lookup_is_soft_revalidate(dentry)) 4455 task_flags |= RPC_TASK_TIMEOUT; 4456 4457 args.bitmask = nfs4_bitmask(server, fattr->label); 4458 4459 nfs_fattr_init(fattr); 4460 4461 dprintk("NFS call lookup %pd2\n", dentry); 4462 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4463 status = nfs4_do_call_sync(clnt, server, &msg, 4464 &args.seq_args, &res.seq_res, task_flags); 4465 dprintk("NFS reply lookup: %d\n", status); 4466 return status; 4467 } 4468 4469 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4470 { 4471 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4472 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4473 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4474 fattr->nlink = 2; 4475 } 4476 4477 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4478 struct dentry *dentry, struct nfs_fh *fhandle, 4479 struct nfs_fattr *fattr) 4480 { 4481 struct nfs4_exception exception = { 4482 .interruptible = true, 4483 }; 4484 struct rpc_clnt *client = *clnt; 4485 const struct qstr *name = &dentry->d_name; 4486 int err; 4487 do { 4488 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4489 trace_nfs4_lookup(dir, name, err); 4490 switch (err) { 4491 case -NFS4ERR_BADNAME: 4492 err = -ENOENT; 4493 goto out; 4494 case -NFS4ERR_MOVED: 4495 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4496 if (err == -NFS4ERR_MOVED) 4497 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4498 goto out; 4499 case -NFS4ERR_WRONGSEC: 4500 err = -EPERM; 4501 if (client != *clnt) 4502 goto out; 4503 client = nfs4_negotiate_security(client, dir, name); 4504 if (IS_ERR(client)) 4505 return PTR_ERR(client); 4506 4507 exception.retry = 1; 4508 break; 4509 default: 4510 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4511 } 4512 } while (exception.retry); 4513 4514 out: 4515 if (err == 0) 4516 *clnt = client; 4517 else if (client != *clnt) 4518 rpc_shutdown_client(client); 4519 4520 return err; 4521 } 4522 4523 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4524 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4525 { 4526 int status; 4527 struct rpc_clnt *client = NFS_CLIENT(dir); 4528 4529 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4530 if (client != NFS_CLIENT(dir)) { 4531 rpc_shutdown_client(client); 4532 nfs_fixup_secinfo_attributes(fattr); 4533 } 4534 return status; 4535 } 4536 4537 struct rpc_clnt * 4538 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4539 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4540 { 4541 struct rpc_clnt *client = NFS_CLIENT(dir); 4542 int status; 4543 4544 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4545 if (status < 0) 4546 return ERR_PTR(status); 4547 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4548 } 4549 4550 static int _nfs4_proc_lookupp(struct inode *inode, 4551 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4552 { 4553 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4554 struct nfs_server *server = NFS_SERVER(inode); 4555 int status; 4556 struct nfs4_lookupp_arg args = { 4557 .bitmask = server->attr_bitmask, 4558 .fh = NFS_FH(inode), 4559 }; 4560 struct nfs4_lookupp_res res = { 4561 .server = server, 4562 .fattr = fattr, 4563 .fh = fhandle, 4564 }; 4565 struct rpc_message msg = { 4566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4567 .rpc_argp = &args, 4568 .rpc_resp = &res, 4569 }; 4570 unsigned short task_flags = 0; 4571 4572 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4573 task_flags |= RPC_TASK_TIMEOUT; 4574 4575 args.bitmask = nfs4_bitmask(server, fattr->label); 4576 4577 nfs_fattr_init(fattr); 4578 4579 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4580 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4581 &res.seq_res, task_flags); 4582 dprintk("NFS reply lookupp: %d\n", status); 4583 return status; 4584 } 4585 4586 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4587 struct nfs_fattr *fattr) 4588 { 4589 struct nfs4_exception exception = { 4590 .interruptible = true, 4591 }; 4592 int err; 4593 do { 4594 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4595 trace_nfs4_lookupp(inode, err); 4596 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4597 &exception); 4598 } while (exception.retry); 4599 return err; 4600 } 4601 4602 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4603 const struct cred *cred) 4604 { 4605 struct nfs_server *server = NFS_SERVER(inode); 4606 struct nfs4_accessargs args = { 4607 .fh = NFS_FH(inode), 4608 .access = entry->mask, 4609 }; 4610 struct nfs4_accessres res = { 4611 .server = server, 4612 }; 4613 struct rpc_message msg = { 4614 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4615 .rpc_argp = &args, 4616 .rpc_resp = &res, 4617 .rpc_cred = cred, 4618 }; 4619 int status = 0; 4620 4621 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4622 res.fattr = nfs_alloc_fattr(); 4623 if (res.fattr == NULL) 4624 return -ENOMEM; 4625 args.bitmask = server->cache_consistency_bitmask; 4626 } 4627 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4628 if (!status) { 4629 nfs_access_set_mask(entry, res.access); 4630 if (res.fattr) 4631 nfs_refresh_inode(inode, res.fattr); 4632 } 4633 nfs_free_fattr(res.fattr); 4634 return status; 4635 } 4636 4637 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4638 const struct cred *cred) 4639 { 4640 struct nfs4_exception exception = { 4641 .interruptible = true, 4642 }; 4643 int err; 4644 do { 4645 err = _nfs4_proc_access(inode, entry, cred); 4646 trace_nfs4_access(inode, err); 4647 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4648 &exception); 4649 } while (exception.retry); 4650 return err; 4651 } 4652 4653 /* 4654 * TODO: For the time being, we don't try to get any attributes 4655 * along with any of the zero-copy operations READ, READDIR, 4656 * READLINK, WRITE. 4657 * 4658 * In the case of the first three, we want to put the GETATTR 4659 * after the read-type operation -- this is because it is hard 4660 * to predict the length of a GETATTR response in v4, and thus 4661 * align the READ data correctly. This means that the GETATTR 4662 * may end up partially falling into the page cache, and we should 4663 * shift it into the 'tail' of the xdr_buf before processing. 4664 * To do this efficiently, we need to know the total length 4665 * of data received, which doesn't seem to be available outside 4666 * of the RPC layer. 4667 * 4668 * In the case of WRITE, we also want to put the GETATTR after 4669 * the operation -- in this case because we want to make sure 4670 * we get the post-operation mtime and size. 4671 * 4672 * Both of these changes to the XDR layer would in fact be quite 4673 * minor, but I decided to leave them for a subsequent patch. 4674 */ 4675 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4676 unsigned int pgbase, unsigned int pglen) 4677 { 4678 struct nfs4_readlink args = { 4679 .fh = NFS_FH(inode), 4680 .pgbase = pgbase, 4681 .pglen = pglen, 4682 .pages = &page, 4683 }; 4684 struct nfs4_readlink_res res; 4685 struct rpc_message msg = { 4686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4687 .rpc_argp = &args, 4688 .rpc_resp = &res, 4689 }; 4690 4691 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4692 } 4693 4694 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4695 unsigned int pgbase, unsigned int pglen) 4696 { 4697 struct nfs4_exception exception = { 4698 .interruptible = true, 4699 }; 4700 int err; 4701 do { 4702 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4703 trace_nfs4_readlink(inode, err); 4704 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4705 &exception); 4706 } while (exception.retry); 4707 return err; 4708 } 4709 4710 /* 4711 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4712 */ 4713 static int 4714 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4715 int flags) 4716 { 4717 struct nfs_server *server = NFS_SERVER(dir); 4718 struct nfs4_label l, *ilabel; 4719 struct nfs_open_context *ctx; 4720 struct nfs4_state *state; 4721 int status = 0; 4722 4723 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4724 if (IS_ERR(ctx)) 4725 return PTR_ERR(ctx); 4726 4727 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4728 4729 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4730 sattr->ia_mode &= ~current_umask(); 4731 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4732 if (IS_ERR(state)) { 4733 status = PTR_ERR(state); 4734 goto out; 4735 } 4736 out: 4737 nfs4_label_release_security(ilabel); 4738 put_nfs_open_context(ctx); 4739 return status; 4740 } 4741 4742 static int 4743 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4744 { 4745 struct nfs_server *server = NFS_SERVER(dir); 4746 struct nfs_removeargs args = { 4747 .fh = NFS_FH(dir), 4748 .name = *name, 4749 }; 4750 struct nfs_removeres res = { 4751 .server = server, 4752 }; 4753 struct rpc_message msg = { 4754 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4755 .rpc_argp = &args, 4756 .rpc_resp = &res, 4757 }; 4758 unsigned long timestamp = jiffies; 4759 int status; 4760 4761 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4762 if (status == 0) { 4763 spin_lock(&dir->i_lock); 4764 /* Removing a directory decrements nlink in the parent */ 4765 if (ftype == NF4DIR && dir->i_nlink > 2) 4766 nfs4_dec_nlink_locked(dir); 4767 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4768 NFS_INO_INVALID_DATA); 4769 spin_unlock(&dir->i_lock); 4770 } 4771 return status; 4772 } 4773 4774 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4775 { 4776 struct nfs4_exception exception = { 4777 .interruptible = true, 4778 }; 4779 struct inode *inode = d_inode(dentry); 4780 int err; 4781 4782 if (inode) { 4783 if (inode->i_nlink == 1) 4784 nfs4_inode_return_delegation(inode); 4785 else 4786 nfs4_inode_make_writeable(inode); 4787 } 4788 do { 4789 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4790 trace_nfs4_remove(dir, &dentry->d_name, err); 4791 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4792 &exception); 4793 } while (exception.retry); 4794 return err; 4795 } 4796 4797 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4798 { 4799 struct nfs4_exception exception = { 4800 .interruptible = true, 4801 }; 4802 int err; 4803 4804 do { 4805 err = _nfs4_proc_remove(dir, name, NF4DIR); 4806 trace_nfs4_remove(dir, name, err); 4807 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4808 &exception); 4809 } while (exception.retry); 4810 return err; 4811 } 4812 4813 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4814 struct dentry *dentry, 4815 struct inode *inode) 4816 { 4817 struct nfs_removeargs *args = msg->rpc_argp; 4818 struct nfs_removeres *res = msg->rpc_resp; 4819 4820 res->server = NFS_SB(dentry->d_sb); 4821 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4822 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4823 4824 nfs_fattr_init(res->dir_attr); 4825 4826 if (inode) { 4827 nfs4_inode_return_delegation(inode); 4828 nfs_d_prune_case_insensitive_aliases(inode); 4829 } 4830 } 4831 4832 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4833 { 4834 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4835 &data->args.seq_args, 4836 &data->res.seq_res, 4837 task); 4838 } 4839 4840 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4841 { 4842 struct nfs_unlinkdata *data = task->tk_calldata; 4843 struct nfs_removeres *res = &data->res; 4844 4845 if (!nfs4_sequence_done(task, &res->seq_res)) 4846 return 0; 4847 if (nfs4_async_handle_error(task, res->server, NULL, 4848 &data->timeout) == -EAGAIN) 4849 return 0; 4850 if (task->tk_status == 0) 4851 nfs4_update_changeattr(dir, &res->cinfo, 4852 res->dir_attr->time_start, 4853 NFS_INO_INVALID_DATA); 4854 return 1; 4855 } 4856 4857 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4858 struct dentry *old_dentry, 4859 struct dentry *new_dentry) 4860 { 4861 struct nfs_renameargs *arg = msg->rpc_argp; 4862 struct nfs_renameres *res = msg->rpc_resp; 4863 struct inode *old_inode = d_inode(old_dentry); 4864 struct inode *new_inode = d_inode(new_dentry); 4865 4866 if (old_inode) 4867 nfs4_inode_make_writeable(old_inode); 4868 if (new_inode) 4869 nfs4_inode_return_delegation(new_inode); 4870 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4871 res->server = NFS_SB(old_dentry->d_sb); 4872 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4873 } 4874 4875 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4876 { 4877 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4878 &data->args.seq_args, 4879 &data->res.seq_res, 4880 task); 4881 } 4882 4883 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4884 struct inode *new_dir) 4885 { 4886 struct nfs_renamedata *data = task->tk_calldata; 4887 struct nfs_renameres *res = &data->res; 4888 4889 if (!nfs4_sequence_done(task, &res->seq_res)) 4890 return 0; 4891 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4892 return 0; 4893 4894 if (task->tk_status == 0) { 4895 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4896 if (new_dir != old_dir) { 4897 /* Note: If we moved a directory, nlink will change */ 4898 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4899 res->old_fattr->time_start, 4900 NFS_INO_INVALID_NLINK | 4901 NFS_INO_INVALID_DATA); 4902 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4903 res->new_fattr->time_start, 4904 NFS_INO_INVALID_NLINK | 4905 NFS_INO_INVALID_DATA); 4906 } else 4907 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4908 res->old_fattr->time_start, 4909 NFS_INO_INVALID_DATA); 4910 } 4911 return 1; 4912 } 4913 4914 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4915 { 4916 struct nfs_server *server = NFS_SERVER(inode); 4917 __u32 bitmask[NFS4_BITMASK_SZ]; 4918 struct nfs4_link_arg arg = { 4919 .fh = NFS_FH(inode), 4920 .dir_fh = NFS_FH(dir), 4921 .name = name, 4922 .bitmask = bitmask, 4923 }; 4924 struct nfs4_link_res res = { 4925 .server = server, 4926 }; 4927 struct rpc_message msg = { 4928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4929 .rpc_argp = &arg, 4930 .rpc_resp = &res, 4931 }; 4932 int status = -ENOMEM; 4933 4934 res.fattr = nfs_alloc_fattr_with_label(server); 4935 if (res.fattr == NULL) 4936 goto out; 4937 4938 nfs4_inode_make_writeable(inode); 4939 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4940 NFS_INO_INVALID_CHANGE); 4941 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4942 if (!status) { 4943 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4944 NFS_INO_INVALID_DATA); 4945 nfs4_inc_nlink(inode); 4946 status = nfs_post_op_update_inode(inode, res.fattr); 4947 if (!status) 4948 nfs_setsecurity(inode, res.fattr); 4949 } 4950 4951 out: 4952 nfs_free_fattr(res.fattr); 4953 return status; 4954 } 4955 4956 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4957 { 4958 struct nfs4_exception exception = { 4959 .interruptible = true, 4960 }; 4961 int err; 4962 do { 4963 err = nfs4_handle_exception(NFS_SERVER(inode), 4964 _nfs4_proc_link(inode, dir, name), 4965 &exception); 4966 } while (exception.retry); 4967 return err; 4968 } 4969 4970 struct nfs4_createdata { 4971 struct rpc_message msg; 4972 struct nfs4_create_arg arg; 4973 struct nfs4_create_res res; 4974 struct nfs_fh fh; 4975 struct nfs_fattr fattr; 4976 }; 4977 4978 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4979 const struct qstr *name, struct iattr *sattr, u32 ftype) 4980 { 4981 struct nfs4_createdata *data; 4982 4983 data = kzalloc(sizeof(*data), GFP_KERNEL); 4984 if (data != NULL) { 4985 struct nfs_server *server = NFS_SERVER(dir); 4986 4987 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4988 if (IS_ERR(data->fattr.label)) 4989 goto out_free; 4990 4991 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4992 data->msg.rpc_argp = &data->arg; 4993 data->msg.rpc_resp = &data->res; 4994 data->arg.dir_fh = NFS_FH(dir); 4995 data->arg.server = server; 4996 data->arg.name = name; 4997 data->arg.attrs = sattr; 4998 data->arg.ftype = ftype; 4999 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 5000 data->arg.umask = current_umask(); 5001 data->res.server = server; 5002 data->res.fh = &data->fh; 5003 data->res.fattr = &data->fattr; 5004 nfs_fattr_init(data->res.fattr); 5005 } 5006 return data; 5007 out_free: 5008 kfree(data); 5009 return NULL; 5010 } 5011 5012 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 5013 { 5014 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 5015 &data->arg.seq_args, &data->res.seq_res, 1); 5016 if (status == 0) { 5017 spin_lock(&dir->i_lock); 5018 /* Creating a directory bumps nlink in the parent */ 5019 if (data->arg.ftype == NF4DIR) 5020 nfs4_inc_nlink_locked(dir); 5021 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 5022 data->res.fattr->time_start, 5023 NFS_INO_INVALID_DATA); 5024 spin_unlock(&dir->i_lock); 5025 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5026 } 5027 return status; 5028 } 5029 5030 static void nfs4_free_createdata(struct nfs4_createdata *data) 5031 { 5032 nfs4_label_free(data->fattr.label); 5033 kfree(data); 5034 } 5035 5036 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5037 struct page *page, unsigned int len, struct iattr *sattr, 5038 struct nfs4_label *label) 5039 { 5040 struct nfs4_createdata *data; 5041 int status = -ENAMETOOLONG; 5042 5043 if (len > NFS4_MAXPATHLEN) 5044 goto out; 5045 5046 status = -ENOMEM; 5047 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5048 if (data == NULL) 5049 goto out; 5050 5051 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5052 data->arg.u.symlink.pages = &page; 5053 data->arg.u.symlink.len = len; 5054 data->arg.label = label; 5055 5056 status = nfs4_do_create(dir, dentry, data); 5057 5058 nfs4_free_createdata(data); 5059 out: 5060 return status; 5061 } 5062 5063 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5064 struct page *page, unsigned int len, struct iattr *sattr) 5065 { 5066 struct nfs4_exception exception = { 5067 .interruptible = true, 5068 }; 5069 struct nfs4_label l, *label; 5070 int err; 5071 5072 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5073 5074 do { 5075 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5076 trace_nfs4_symlink(dir, &dentry->d_name, err); 5077 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5078 &exception); 5079 } while (exception.retry); 5080 5081 nfs4_label_release_security(label); 5082 return err; 5083 } 5084 5085 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5086 struct iattr *sattr, struct nfs4_label *label) 5087 { 5088 struct nfs4_createdata *data; 5089 int status = -ENOMEM; 5090 5091 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5092 if (data == NULL) 5093 goto out; 5094 5095 data->arg.label = label; 5096 status = nfs4_do_create(dir, dentry, data); 5097 5098 nfs4_free_createdata(data); 5099 out: 5100 return status; 5101 } 5102 5103 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5104 struct iattr *sattr) 5105 { 5106 struct nfs_server *server = NFS_SERVER(dir); 5107 struct nfs4_exception exception = { 5108 .interruptible = true, 5109 }; 5110 struct nfs4_label l, *label; 5111 int err; 5112 5113 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5114 5115 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5116 sattr->ia_mode &= ~current_umask(); 5117 do { 5118 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5119 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5120 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5121 &exception); 5122 } while (exception.retry); 5123 nfs4_label_release_security(label); 5124 5125 return err; 5126 } 5127 5128 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5129 struct nfs_readdir_res *nr_res) 5130 { 5131 struct inode *dir = d_inode(nr_arg->dentry); 5132 struct nfs_server *server = NFS_SERVER(dir); 5133 struct nfs4_readdir_arg args = { 5134 .fh = NFS_FH(dir), 5135 .pages = nr_arg->pages, 5136 .pgbase = 0, 5137 .count = nr_arg->page_len, 5138 .plus = nr_arg->plus, 5139 }; 5140 struct nfs4_readdir_res res; 5141 struct rpc_message msg = { 5142 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5143 .rpc_argp = &args, 5144 .rpc_resp = &res, 5145 .rpc_cred = nr_arg->cred, 5146 }; 5147 int status; 5148 5149 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5150 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5151 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5152 args.bitmask = server->attr_bitmask_nl; 5153 else 5154 args.bitmask = server->attr_bitmask; 5155 5156 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5157 res.pgbase = args.pgbase; 5158 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5159 &res.seq_res, 0); 5160 if (status >= 0) { 5161 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5162 status += args.pgbase; 5163 } 5164 5165 nfs_invalidate_atime(dir); 5166 5167 dprintk("%s: returns %d\n", __func__, status); 5168 return status; 5169 } 5170 5171 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5172 struct nfs_readdir_res *res) 5173 { 5174 struct nfs4_exception exception = { 5175 .interruptible = true, 5176 }; 5177 int err; 5178 do { 5179 err = _nfs4_proc_readdir(arg, res); 5180 trace_nfs4_readdir(d_inode(arg->dentry), err); 5181 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5182 err, &exception); 5183 } while (exception.retry); 5184 return err; 5185 } 5186 5187 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5188 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5189 { 5190 struct nfs4_createdata *data; 5191 int mode = sattr->ia_mode; 5192 int status = -ENOMEM; 5193 5194 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5195 if (data == NULL) 5196 goto out; 5197 5198 if (S_ISFIFO(mode)) 5199 data->arg.ftype = NF4FIFO; 5200 else if (S_ISBLK(mode)) { 5201 data->arg.ftype = NF4BLK; 5202 data->arg.u.device.specdata1 = MAJOR(rdev); 5203 data->arg.u.device.specdata2 = MINOR(rdev); 5204 } 5205 else if (S_ISCHR(mode)) { 5206 data->arg.ftype = NF4CHR; 5207 data->arg.u.device.specdata1 = MAJOR(rdev); 5208 data->arg.u.device.specdata2 = MINOR(rdev); 5209 } else if (!S_ISSOCK(mode)) { 5210 status = -EINVAL; 5211 goto out_free; 5212 } 5213 5214 data->arg.label = label; 5215 status = nfs4_do_create(dir, dentry, data); 5216 out_free: 5217 nfs4_free_createdata(data); 5218 out: 5219 return status; 5220 } 5221 5222 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5223 struct iattr *sattr, dev_t rdev) 5224 { 5225 struct nfs_server *server = NFS_SERVER(dir); 5226 struct nfs4_exception exception = { 5227 .interruptible = true, 5228 }; 5229 struct nfs4_label l, *label; 5230 int err; 5231 5232 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5233 5234 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5235 sattr->ia_mode &= ~current_umask(); 5236 do { 5237 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5238 trace_nfs4_mknod(dir, &dentry->d_name, err); 5239 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5240 &exception); 5241 } while (exception.retry); 5242 5243 nfs4_label_release_security(label); 5244 5245 return err; 5246 } 5247 5248 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5249 struct nfs_fsstat *fsstat) 5250 { 5251 struct nfs4_statfs_arg args = { 5252 .fh = fhandle, 5253 .bitmask = server->attr_bitmask, 5254 }; 5255 struct nfs4_statfs_res res = { 5256 .fsstat = fsstat, 5257 }; 5258 struct rpc_message msg = { 5259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5260 .rpc_argp = &args, 5261 .rpc_resp = &res, 5262 }; 5263 5264 nfs_fattr_init(fsstat->fattr); 5265 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5266 } 5267 5268 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5269 { 5270 struct nfs4_exception exception = { 5271 .interruptible = true, 5272 }; 5273 int err; 5274 do { 5275 err = nfs4_handle_exception(server, 5276 _nfs4_proc_statfs(server, fhandle, fsstat), 5277 &exception); 5278 } while (exception.retry); 5279 return err; 5280 } 5281 5282 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5283 struct nfs_fsinfo *fsinfo) 5284 { 5285 struct nfs4_fsinfo_arg args = { 5286 .fh = fhandle, 5287 .bitmask = server->attr_bitmask, 5288 }; 5289 struct nfs4_fsinfo_res res = { 5290 .fsinfo = fsinfo, 5291 }; 5292 struct rpc_message msg = { 5293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5294 .rpc_argp = &args, 5295 .rpc_resp = &res, 5296 }; 5297 5298 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5299 } 5300 5301 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5302 { 5303 struct nfs4_exception exception = { 5304 .interruptible = true, 5305 }; 5306 int err; 5307 5308 do { 5309 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5310 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5311 if (err == 0) { 5312 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5313 break; 5314 } 5315 err = nfs4_handle_exception(server, err, &exception); 5316 } while (exception.retry); 5317 return err; 5318 } 5319 5320 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5321 { 5322 int error; 5323 5324 nfs_fattr_init(fsinfo->fattr); 5325 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5326 if (error == 0) { 5327 /* block layout checks this! */ 5328 server->pnfs_blksize = fsinfo->blksize; 5329 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5330 } 5331 5332 return error; 5333 } 5334 5335 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5336 struct nfs_pathconf *pathconf) 5337 { 5338 struct nfs4_pathconf_arg args = { 5339 .fh = fhandle, 5340 .bitmask = server->attr_bitmask, 5341 }; 5342 struct nfs4_pathconf_res res = { 5343 .pathconf = pathconf, 5344 }; 5345 struct rpc_message msg = { 5346 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5347 .rpc_argp = &args, 5348 .rpc_resp = &res, 5349 }; 5350 5351 /* None of the pathconf attributes are mandatory to implement */ 5352 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5353 memset(pathconf, 0, sizeof(*pathconf)); 5354 return 0; 5355 } 5356 5357 nfs_fattr_init(pathconf->fattr); 5358 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5359 } 5360 5361 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5362 struct nfs_pathconf *pathconf) 5363 { 5364 struct nfs4_exception exception = { 5365 .interruptible = true, 5366 }; 5367 int err; 5368 5369 do { 5370 err = nfs4_handle_exception(server, 5371 _nfs4_proc_pathconf(server, fhandle, pathconf), 5372 &exception); 5373 } while (exception.retry); 5374 return err; 5375 } 5376 5377 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5378 const struct nfs_open_context *ctx, 5379 const struct nfs_lock_context *l_ctx, 5380 fmode_t fmode) 5381 { 5382 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5383 } 5384 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5385 5386 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5387 const struct nfs_open_context *ctx, 5388 const struct nfs_lock_context *l_ctx, 5389 fmode_t fmode) 5390 { 5391 nfs4_stateid _current_stateid; 5392 5393 /* If the current stateid represents a lost lock, then exit */ 5394 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5395 return true; 5396 return nfs4_stateid_match(stateid, &_current_stateid); 5397 } 5398 5399 static bool nfs4_error_stateid_expired(int err) 5400 { 5401 switch (err) { 5402 case -NFS4ERR_DELEG_REVOKED: 5403 case -NFS4ERR_ADMIN_REVOKED: 5404 case -NFS4ERR_BAD_STATEID: 5405 case -NFS4ERR_STALE_STATEID: 5406 case -NFS4ERR_OLD_STATEID: 5407 case -NFS4ERR_OPENMODE: 5408 case -NFS4ERR_EXPIRED: 5409 return true; 5410 } 5411 return false; 5412 } 5413 5414 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5415 { 5416 struct nfs_server *server = NFS_SERVER(hdr->inode); 5417 5418 trace_nfs4_read(hdr, task->tk_status); 5419 if (task->tk_status < 0) { 5420 struct nfs4_exception exception = { 5421 .inode = hdr->inode, 5422 .state = hdr->args.context->state, 5423 .stateid = &hdr->args.stateid, 5424 }; 5425 task->tk_status = nfs4_async_handle_exception(task, 5426 server, task->tk_status, &exception); 5427 if (exception.retry) { 5428 rpc_restart_call_prepare(task); 5429 return -EAGAIN; 5430 } 5431 } 5432 5433 if (task->tk_status > 0) 5434 renew_lease(server, hdr->timestamp); 5435 return 0; 5436 } 5437 5438 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5439 struct nfs_pgio_args *args) 5440 { 5441 5442 if (!nfs4_error_stateid_expired(task->tk_status) || 5443 nfs4_stateid_is_current(&args->stateid, 5444 args->context, 5445 args->lock_context, 5446 FMODE_READ)) 5447 return false; 5448 rpc_restart_call_prepare(task); 5449 return true; 5450 } 5451 5452 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5453 struct nfs_pgio_header *hdr) 5454 { 5455 struct nfs_server *server = NFS_SERVER(hdr->inode); 5456 struct rpc_message *msg = &task->tk_msg; 5457 5458 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5459 task->tk_status == -ENOTSUPP) { 5460 server->caps &= ~NFS_CAP_READ_PLUS; 5461 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5462 rpc_restart_call_prepare(task); 5463 return true; 5464 } 5465 return false; 5466 } 5467 5468 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5469 { 5470 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5471 return -EAGAIN; 5472 if (nfs4_read_stateid_changed(task, &hdr->args)) 5473 return -EAGAIN; 5474 if (nfs4_read_plus_not_supported(task, hdr)) 5475 return -EAGAIN; 5476 if (task->tk_status > 0) 5477 nfs_invalidate_atime(hdr->inode); 5478 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5479 nfs4_read_done_cb(task, hdr); 5480 } 5481 5482 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5483 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5484 struct rpc_message *msg) 5485 { 5486 /* Note: We don't use READ_PLUS with pNFS yet */ 5487 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5488 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5489 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5490 } 5491 return false; 5492 } 5493 #else 5494 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5495 struct rpc_message *msg) 5496 { 5497 return false; 5498 } 5499 #endif /* CONFIG_NFS_V4_2 */ 5500 5501 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5502 struct rpc_message *msg) 5503 { 5504 hdr->timestamp = jiffies; 5505 if (!hdr->pgio_done_cb) 5506 hdr->pgio_done_cb = nfs4_read_done_cb; 5507 if (!nfs42_read_plus_support(hdr, msg)) 5508 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5509 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5510 } 5511 5512 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5513 struct nfs_pgio_header *hdr) 5514 { 5515 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5516 &hdr->args.seq_args, 5517 &hdr->res.seq_res, 5518 task)) 5519 return 0; 5520 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5521 hdr->args.lock_context, 5522 hdr->rw_mode) == -EIO) 5523 return -EIO; 5524 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5525 return -EIO; 5526 return 0; 5527 } 5528 5529 static int nfs4_write_done_cb(struct rpc_task *task, 5530 struct nfs_pgio_header *hdr) 5531 { 5532 struct inode *inode = hdr->inode; 5533 5534 trace_nfs4_write(hdr, task->tk_status); 5535 if (task->tk_status < 0) { 5536 struct nfs4_exception exception = { 5537 .inode = hdr->inode, 5538 .state = hdr->args.context->state, 5539 .stateid = &hdr->args.stateid, 5540 }; 5541 task->tk_status = nfs4_async_handle_exception(task, 5542 NFS_SERVER(inode), task->tk_status, 5543 &exception); 5544 if (exception.retry) { 5545 rpc_restart_call_prepare(task); 5546 return -EAGAIN; 5547 } 5548 } 5549 if (task->tk_status >= 0) { 5550 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5551 nfs_writeback_update_inode(hdr); 5552 } 5553 return 0; 5554 } 5555 5556 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5557 struct nfs_pgio_args *args) 5558 { 5559 5560 if (!nfs4_error_stateid_expired(task->tk_status) || 5561 nfs4_stateid_is_current(&args->stateid, 5562 args->context, 5563 args->lock_context, 5564 FMODE_WRITE)) 5565 return false; 5566 rpc_restart_call_prepare(task); 5567 return true; 5568 } 5569 5570 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5571 { 5572 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5573 return -EAGAIN; 5574 if (nfs4_write_stateid_changed(task, &hdr->args)) 5575 return -EAGAIN; 5576 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5577 nfs4_write_done_cb(task, hdr); 5578 } 5579 5580 static 5581 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5582 { 5583 /* Don't request attributes for pNFS or O_DIRECT writes */ 5584 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5585 return false; 5586 /* Otherwise, request attributes if and only if we don't hold 5587 * a delegation 5588 */ 5589 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5590 } 5591 5592 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5593 struct inode *inode, unsigned long cache_validity) 5594 { 5595 struct nfs_server *server = NFS_SERVER(inode); 5596 unsigned int i; 5597 5598 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5599 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5600 5601 if (cache_validity & NFS_INO_INVALID_CHANGE) 5602 bitmask[0] |= FATTR4_WORD0_CHANGE; 5603 if (cache_validity & NFS_INO_INVALID_ATIME) 5604 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5605 if (cache_validity & NFS_INO_INVALID_MODE) 5606 bitmask[1] |= FATTR4_WORD1_MODE; 5607 if (cache_validity & NFS_INO_INVALID_OTHER) 5608 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5609 if (cache_validity & NFS_INO_INVALID_NLINK) 5610 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5611 if (cache_validity & NFS_INO_INVALID_CTIME) 5612 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5613 if (cache_validity & NFS_INO_INVALID_MTIME) 5614 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5615 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5616 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5617 5618 if (cache_validity & NFS_INO_INVALID_SIZE) 5619 bitmask[0] |= FATTR4_WORD0_SIZE; 5620 5621 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5622 bitmask[i] &= server->attr_bitmask[i]; 5623 } 5624 5625 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5626 struct rpc_message *msg, 5627 struct rpc_clnt **clnt) 5628 { 5629 struct nfs_server *server = NFS_SERVER(hdr->inode); 5630 5631 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5632 hdr->args.bitmask = NULL; 5633 hdr->res.fattr = NULL; 5634 } else { 5635 nfs4_bitmask_set(hdr->args.bitmask_store, 5636 server->cache_consistency_bitmask, 5637 hdr->inode, NFS_INO_INVALID_BLOCKS); 5638 hdr->args.bitmask = hdr->args.bitmask_store; 5639 } 5640 5641 if (!hdr->pgio_done_cb) 5642 hdr->pgio_done_cb = nfs4_write_done_cb; 5643 hdr->res.server = server; 5644 hdr->timestamp = jiffies; 5645 5646 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5647 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5648 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr); 5649 } 5650 5651 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5652 { 5653 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5654 &data->args.seq_args, 5655 &data->res.seq_res, 5656 task); 5657 } 5658 5659 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5660 { 5661 struct inode *inode = data->inode; 5662 5663 trace_nfs4_commit(data, task->tk_status); 5664 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5665 NULL, NULL) == -EAGAIN) { 5666 rpc_restart_call_prepare(task); 5667 return -EAGAIN; 5668 } 5669 return 0; 5670 } 5671 5672 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5673 { 5674 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5675 return -EAGAIN; 5676 return data->commit_done_cb(task, data); 5677 } 5678 5679 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5680 struct rpc_clnt **clnt) 5681 { 5682 struct nfs_server *server = NFS_SERVER(data->inode); 5683 5684 if (data->commit_done_cb == NULL) 5685 data->commit_done_cb = nfs4_commit_done_cb; 5686 data->res.server = server; 5687 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5688 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5689 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client, 5690 NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5691 } 5692 5693 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5694 struct nfs_commitres *res) 5695 { 5696 struct inode *dst_inode = file_inode(dst); 5697 struct nfs_server *server = NFS_SERVER(dst_inode); 5698 struct rpc_message msg = { 5699 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5700 .rpc_argp = args, 5701 .rpc_resp = res, 5702 }; 5703 5704 args->fh = NFS_FH(dst_inode); 5705 return nfs4_call_sync(server->client, server, &msg, 5706 &args->seq_args, &res->seq_res, 1); 5707 } 5708 5709 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5710 { 5711 struct nfs_commitargs args = { 5712 .offset = offset, 5713 .count = count, 5714 }; 5715 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5716 struct nfs4_exception exception = { }; 5717 int status; 5718 5719 do { 5720 status = _nfs4_proc_commit(dst, &args, res); 5721 status = nfs4_handle_exception(dst_server, status, &exception); 5722 } while (exception.retry); 5723 5724 return status; 5725 } 5726 5727 struct nfs4_renewdata { 5728 struct nfs_client *client; 5729 unsigned long timestamp; 5730 }; 5731 5732 /* 5733 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5734 * standalone procedure for queueing an asynchronous RENEW. 5735 */ 5736 static void nfs4_renew_release(void *calldata) 5737 { 5738 struct nfs4_renewdata *data = calldata; 5739 struct nfs_client *clp = data->client; 5740 5741 if (refcount_read(&clp->cl_count) > 1) 5742 nfs4_schedule_state_renewal(clp); 5743 nfs_put_client(clp); 5744 kfree(data); 5745 } 5746 5747 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5748 { 5749 struct nfs4_renewdata *data = calldata; 5750 struct nfs_client *clp = data->client; 5751 unsigned long timestamp = data->timestamp; 5752 5753 trace_nfs4_renew_async(clp, task->tk_status); 5754 switch (task->tk_status) { 5755 case 0: 5756 break; 5757 case -NFS4ERR_LEASE_MOVED: 5758 nfs4_schedule_lease_moved_recovery(clp); 5759 break; 5760 default: 5761 /* Unless we're shutting down, schedule state recovery! */ 5762 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5763 return; 5764 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5765 nfs4_schedule_lease_recovery(clp); 5766 return; 5767 } 5768 nfs4_schedule_path_down_recovery(clp); 5769 } 5770 do_renew_lease(clp, timestamp); 5771 } 5772 5773 static const struct rpc_call_ops nfs4_renew_ops = { 5774 .rpc_call_done = nfs4_renew_done, 5775 .rpc_release = nfs4_renew_release, 5776 }; 5777 5778 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5779 { 5780 struct rpc_message msg = { 5781 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5782 .rpc_argp = clp, 5783 .rpc_cred = cred, 5784 }; 5785 struct nfs4_renewdata *data; 5786 5787 if (renew_flags == 0) 5788 return 0; 5789 if (!refcount_inc_not_zero(&clp->cl_count)) 5790 return -EIO; 5791 data = kmalloc(sizeof(*data), GFP_NOFS); 5792 if (data == NULL) { 5793 nfs_put_client(clp); 5794 return -ENOMEM; 5795 } 5796 data->client = clp; 5797 data->timestamp = jiffies; 5798 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5799 &nfs4_renew_ops, data); 5800 } 5801 5802 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5803 { 5804 struct rpc_message msg = { 5805 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5806 .rpc_argp = clp, 5807 .rpc_cred = cred, 5808 }; 5809 unsigned long now = jiffies; 5810 int status; 5811 5812 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5813 if (status < 0) 5814 return status; 5815 do_renew_lease(clp, now); 5816 return 0; 5817 } 5818 5819 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5820 enum nfs4_acl_type type) 5821 { 5822 switch (type) { 5823 default: 5824 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5825 case NFS4ACL_DACL: 5826 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5827 case NFS4ACL_SACL: 5828 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5829 } 5830 } 5831 5832 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5833 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5834 * the stack. 5835 */ 5836 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5837 5838 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5839 struct page **pages) 5840 { 5841 struct page *newpage, **spages; 5842 int rc = 0; 5843 size_t len; 5844 spages = pages; 5845 5846 do { 5847 len = min_t(size_t, PAGE_SIZE, buflen); 5848 newpage = alloc_page(GFP_KERNEL); 5849 5850 if (newpage == NULL) 5851 goto unwind; 5852 memcpy(page_address(newpage), buf, len); 5853 buf += len; 5854 buflen -= len; 5855 *pages++ = newpage; 5856 rc++; 5857 } while (buflen != 0); 5858 5859 return rc; 5860 5861 unwind: 5862 for(; rc > 0; rc--) 5863 __free_page(spages[rc-1]); 5864 return -ENOMEM; 5865 } 5866 5867 struct nfs4_cached_acl { 5868 enum nfs4_acl_type type; 5869 int cached; 5870 size_t len; 5871 char data[]; 5872 }; 5873 5874 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5875 { 5876 struct nfs_inode *nfsi = NFS_I(inode); 5877 5878 spin_lock(&inode->i_lock); 5879 kfree(nfsi->nfs4_acl); 5880 nfsi->nfs4_acl = acl; 5881 spin_unlock(&inode->i_lock); 5882 } 5883 5884 static void nfs4_zap_acl_attr(struct inode *inode) 5885 { 5886 nfs4_set_cached_acl(inode, NULL); 5887 } 5888 5889 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5890 size_t buflen, enum nfs4_acl_type type) 5891 { 5892 struct nfs_inode *nfsi = NFS_I(inode); 5893 struct nfs4_cached_acl *acl; 5894 int ret = -ENOENT; 5895 5896 spin_lock(&inode->i_lock); 5897 acl = nfsi->nfs4_acl; 5898 if (acl == NULL) 5899 goto out; 5900 if (acl->type != type) 5901 goto out; 5902 if (buf == NULL) /* user is just asking for length */ 5903 goto out_len; 5904 if (acl->cached == 0) 5905 goto out; 5906 ret = -ERANGE; /* see getxattr(2) man page */ 5907 if (acl->len > buflen) 5908 goto out; 5909 memcpy(buf, acl->data, acl->len); 5910 out_len: 5911 ret = acl->len; 5912 out: 5913 spin_unlock(&inode->i_lock); 5914 return ret; 5915 } 5916 5917 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5918 size_t pgbase, size_t acl_len, 5919 enum nfs4_acl_type type) 5920 { 5921 struct nfs4_cached_acl *acl; 5922 size_t buflen = sizeof(*acl) + acl_len; 5923 5924 if (buflen <= PAGE_SIZE) { 5925 acl = kmalloc(buflen, GFP_KERNEL); 5926 if (acl == NULL) 5927 goto out; 5928 acl->cached = 1; 5929 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5930 } else { 5931 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5932 if (acl == NULL) 5933 goto out; 5934 acl->cached = 0; 5935 } 5936 acl->type = type; 5937 acl->len = acl_len; 5938 out: 5939 nfs4_set_cached_acl(inode, acl); 5940 } 5941 5942 /* 5943 * The getxattr API returns the required buffer length when called with a 5944 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5945 * the required buf. On a NULL buf, we send a page of data to the server 5946 * guessing that the ACL request can be serviced by a page. If so, we cache 5947 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5948 * the cache. If not so, we throw away the page, and cache the required 5949 * length. The next getxattr call will then produce another round trip to 5950 * the server, this time with the input buf of the required size. 5951 */ 5952 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5953 size_t buflen, enum nfs4_acl_type type) 5954 { 5955 struct page **pages; 5956 struct nfs_getaclargs args = { 5957 .fh = NFS_FH(inode), 5958 .acl_type = type, 5959 .acl_len = buflen, 5960 }; 5961 struct nfs_getaclres res = { 5962 .acl_type = type, 5963 .acl_len = buflen, 5964 }; 5965 struct rpc_message msg = { 5966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5967 .rpc_argp = &args, 5968 .rpc_resp = &res, 5969 }; 5970 unsigned int npages; 5971 int ret = -ENOMEM, i; 5972 struct nfs_server *server = NFS_SERVER(inode); 5973 5974 if (buflen == 0) 5975 buflen = server->rsize; 5976 5977 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5978 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5979 if (!pages) 5980 return -ENOMEM; 5981 5982 args.acl_pages = pages; 5983 5984 for (i = 0; i < npages; i++) { 5985 pages[i] = alloc_page(GFP_KERNEL); 5986 if (!pages[i]) 5987 goto out_free; 5988 } 5989 5990 /* for decoding across pages */ 5991 res.acl_scratch = alloc_page(GFP_KERNEL); 5992 if (!res.acl_scratch) 5993 goto out_free; 5994 5995 args.acl_len = npages * PAGE_SIZE; 5996 5997 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5998 __func__, buf, buflen, npages, args.acl_len); 5999 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 6000 &msg, &args.seq_args, &res.seq_res, 0); 6001 if (ret) 6002 goto out_free; 6003 6004 /* Handle the case where the passed-in buffer is too short */ 6005 if (res.acl_flags & NFS4_ACL_TRUNC) { 6006 /* Did the user only issue a request for the acl length? */ 6007 if (buf == NULL) 6008 goto out_ok; 6009 ret = -ERANGE; 6010 goto out_free; 6011 } 6012 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 6013 type); 6014 if (buf) { 6015 if (res.acl_len > buflen) { 6016 ret = -ERANGE; 6017 goto out_free; 6018 } 6019 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 6020 } 6021 out_ok: 6022 ret = res.acl_len; 6023 out_free: 6024 while (--i >= 0) 6025 __free_page(pages[i]); 6026 if (res.acl_scratch) 6027 __free_page(res.acl_scratch); 6028 kfree(pages); 6029 return ret; 6030 } 6031 6032 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6033 size_t buflen, enum nfs4_acl_type type) 6034 { 6035 struct nfs4_exception exception = { 6036 .interruptible = true, 6037 }; 6038 ssize_t ret; 6039 do { 6040 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6041 trace_nfs4_get_acl(inode, ret); 6042 if (ret >= 0) 6043 break; 6044 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6045 } while (exception.retry); 6046 return ret; 6047 } 6048 6049 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6050 enum nfs4_acl_type type) 6051 { 6052 struct nfs_server *server = NFS_SERVER(inode); 6053 int ret; 6054 6055 if (!nfs4_server_supports_acls(server, type)) 6056 return -EOPNOTSUPP; 6057 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6058 if (ret < 0) 6059 return ret; 6060 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6061 nfs_zap_acl_cache(inode); 6062 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6063 if (ret != -ENOENT) 6064 /* -ENOENT is returned if there is no ACL or if there is an ACL 6065 * but no cached acl data, just the acl length */ 6066 return ret; 6067 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6068 } 6069 6070 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6071 size_t buflen, enum nfs4_acl_type type) 6072 { 6073 struct nfs_server *server = NFS_SERVER(inode); 6074 struct page *pages[NFS4ACL_MAXPAGES]; 6075 struct nfs_setaclargs arg = { 6076 .fh = NFS_FH(inode), 6077 .acl_type = type, 6078 .acl_len = buflen, 6079 .acl_pages = pages, 6080 }; 6081 struct nfs_setaclres res; 6082 struct rpc_message msg = { 6083 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6084 .rpc_argp = &arg, 6085 .rpc_resp = &res, 6086 }; 6087 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6088 int ret, i; 6089 6090 /* You can't remove system.nfs4_acl: */ 6091 if (buflen == 0) 6092 return -EINVAL; 6093 if (!nfs4_server_supports_acls(server, type)) 6094 return -EOPNOTSUPP; 6095 if (npages > ARRAY_SIZE(pages)) 6096 return -ERANGE; 6097 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6098 if (i < 0) 6099 return i; 6100 nfs4_inode_make_writeable(inode); 6101 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6102 6103 /* 6104 * Free each page after tx, so the only ref left is 6105 * held by the network stack 6106 */ 6107 for (; i > 0; i--) 6108 put_page(pages[i-1]); 6109 6110 /* 6111 * Acl update can result in inode attribute update. 6112 * so mark the attribute cache invalid. 6113 */ 6114 spin_lock(&inode->i_lock); 6115 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6116 NFS_INO_INVALID_CTIME | 6117 NFS_INO_REVAL_FORCED); 6118 spin_unlock(&inode->i_lock); 6119 nfs_access_zap_cache(inode); 6120 nfs_zap_acl_cache(inode); 6121 return ret; 6122 } 6123 6124 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6125 size_t buflen, enum nfs4_acl_type type) 6126 { 6127 struct nfs4_exception exception = { }; 6128 int err; 6129 do { 6130 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6131 trace_nfs4_set_acl(inode, err); 6132 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6133 /* 6134 * no need to retry since the kernel 6135 * isn't involved in encoding the ACEs. 6136 */ 6137 err = -EINVAL; 6138 break; 6139 } 6140 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6141 &exception); 6142 } while (exception.retry); 6143 return err; 6144 } 6145 6146 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6147 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6148 size_t buflen) 6149 { 6150 struct nfs_server *server = NFS_SERVER(inode); 6151 struct nfs4_label label = {0, 0, buflen, buf}; 6152 6153 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6154 struct nfs_fattr fattr = { 6155 .label = &label, 6156 }; 6157 struct nfs4_getattr_arg arg = { 6158 .fh = NFS_FH(inode), 6159 .bitmask = bitmask, 6160 }; 6161 struct nfs4_getattr_res res = { 6162 .fattr = &fattr, 6163 .server = server, 6164 }; 6165 struct rpc_message msg = { 6166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6167 .rpc_argp = &arg, 6168 .rpc_resp = &res, 6169 }; 6170 int ret; 6171 6172 nfs_fattr_init(&fattr); 6173 6174 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6175 if (ret) 6176 return ret; 6177 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6178 return -ENOENT; 6179 return label.len; 6180 } 6181 6182 static int nfs4_get_security_label(struct inode *inode, void *buf, 6183 size_t buflen) 6184 { 6185 struct nfs4_exception exception = { 6186 .interruptible = true, 6187 }; 6188 int err; 6189 6190 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6191 return -EOPNOTSUPP; 6192 6193 do { 6194 err = _nfs4_get_security_label(inode, buf, buflen); 6195 trace_nfs4_get_security_label(inode, err); 6196 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6197 &exception); 6198 } while (exception.retry); 6199 return err; 6200 } 6201 6202 static int _nfs4_do_set_security_label(struct inode *inode, 6203 struct nfs4_label *ilabel, 6204 struct nfs_fattr *fattr) 6205 { 6206 6207 struct iattr sattr = {0}; 6208 struct nfs_server *server = NFS_SERVER(inode); 6209 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6210 struct nfs_setattrargs arg = { 6211 .fh = NFS_FH(inode), 6212 .iap = &sattr, 6213 .server = server, 6214 .bitmask = bitmask, 6215 .label = ilabel, 6216 }; 6217 struct nfs_setattrres res = { 6218 .fattr = fattr, 6219 .server = server, 6220 }; 6221 struct rpc_message msg = { 6222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6223 .rpc_argp = &arg, 6224 .rpc_resp = &res, 6225 }; 6226 int status; 6227 6228 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6229 6230 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6231 if (status) 6232 dprintk("%s failed: %d\n", __func__, status); 6233 6234 return status; 6235 } 6236 6237 static int nfs4_do_set_security_label(struct inode *inode, 6238 struct nfs4_label *ilabel, 6239 struct nfs_fattr *fattr) 6240 { 6241 struct nfs4_exception exception = { }; 6242 int err; 6243 6244 do { 6245 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6246 trace_nfs4_set_security_label(inode, err); 6247 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6248 &exception); 6249 } while (exception.retry); 6250 return err; 6251 } 6252 6253 static int 6254 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6255 { 6256 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6257 struct nfs_fattr *fattr; 6258 int status; 6259 6260 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6261 return -EOPNOTSUPP; 6262 6263 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6264 if (fattr == NULL) 6265 return -ENOMEM; 6266 6267 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6268 if (status == 0) 6269 nfs_setsecurity(inode, fattr); 6270 6271 return status; 6272 } 6273 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6274 6275 6276 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6277 nfs4_verifier *bootverf) 6278 { 6279 __be32 verf[2]; 6280 6281 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6282 /* An impossible timestamp guarantees this value 6283 * will never match a generated boot time. */ 6284 verf[0] = cpu_to_be32(U32_MAX); 6285 verf[1] = cpu_to_be32(U32_MAX); 6286 } else { 6287 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6288 u64 ns = ktime_to_ns(nn->boot_time); 6289 6290 verf[0] = cpu_to_be32(ns >> 32); 6291 verf[1] = cpu_to_be32(ns); 6292 } 6293 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6294 } 6295 6296 static size_t 6297 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6298 { 6299 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6300 struct nfs_netns_client *nn_clp = nn->nfs_client; 6301 const char *id; 6302 6303 buf[0] = '\0'; 6304 6305 if (nn_clp) { 6306 rcu_read_lock(); 6307 id = rcu_dereference(nn_clp->identifier); 6308 if (id) 6309 strscpy(buf, id, buflen); 6310 rcu_read_unlock(); 6311 } 6312 6313 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6314 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6315 6316 return strlen(buf); 6317 } 6318 6319 static int 6320 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6321 { 6322 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6323 size_t buflen; 6324 size_t len; 6325 char *str; 6326 6327 if (clp->cl_owner_id != NULL) 6328 return 0; 6329 6330 rcu_read_lock(); 6331 len = 14 + 6332 strlen(clp->cl_rpcclient->cl_nodename) + 6333 1 + 6334 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6335 1; 6336 rcu_read_unlock(); 6337 6338 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6339 if (buflen) 6340 len += buflen + 1; 6341 6342 if (len > NFS4_OPAQUE_LIMIT + 1) 6343 return -EINVAL; 6344 6345 /* 6346 * Since this string is allocated at mount time, and held until the 6347 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6348 * about a memory-reclaim deadlock. 6349 */ 6350 str = kmalloc(len, GFP_KERNEL); 6351 if (!str) 6352 return -ENOMEM; 6353 6354 rcu_read_lock(); 6355 if (buflen) 6356 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6357 clp->cl_rpcclient->cl_nodename, buf, 6358 rpc_peeraddr2str(clp->cl_rpcclient, 6359 RPC_DISPLAY_ADDR)); 6360 else 6361 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6362 clp->cl_rpcclient->cl_nodename, 6363 rpc_peeraddr2str(clp->cl_rpcclient, 6364 RPC_DISPLAY_ADDR)); 6365 rcu_read_unlock(); 6366 6367 clp->cl_owner_id = str; 6368 return 0; 6369 } 6370 6371 static int 6372 nfs4_init_uniform_client_string(struct nfs_client *clp) 6373 { 6374 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6375 size_t buflen; 6376 size_t len; 6377 char *str; 6378 6379 if (clp->cl_owner_id != NULL) 6380 return 0; 6381 6382 len = 10 + 10 + 1 + 10 + 1 + 6383 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6384 6385 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6386 if (buflen) 6387 len += buflen + 1; 6388 6389 if (len > NFS4_OPAQUE_LIMIT + 1) 6390 return -EINVAL; 6391 6392 /* 6393 * Since this string is allocated at mount time, and held until the 6394 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6395 * about a memory-reclaim deadlock. 6396 */ 6397 str = kmalloc(len, GFP_KERNEL); 6398 if (!str) 6399 return -ENOMEM; 6400 6401 if (buflen) 6402 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6403 clp->rpc_ops->version, clp->cl_minorversion, 6404 buf, clp->cl_rpcclient->cl_nodename); 6405 else 6406 scnprintf(str, len, "Linux NFSv%u.%u %s", 6407 clp->rpc_ops->version, clp->cl_minorversion, 6408 clp->cl_rpcclient->cl_nodename); 6409 clp->cl_owner_id = str; 6410 return 0; 6411 } 6412 6413 /* 6414 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6415 * services. Advertise one based on the address family of the 6416 * clientaddr. 6417 */ 6418 static unsigned int 6419 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6420 { 6421 if (strchr(clp->cl_ipaddr, ':') != NULL) 6422 return scnprintf(buf, len, "tcp6"); 6423 else 6424 return scnprintf(buf, len, "tcp"); 6425 } 6426 6427 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6428 { 6429 struct nfs4_setclientid *sc = calldata; 6430 6431 if (task->tk_status == 0) 6432 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6433 } 6434 6435 static const struct rpc_call_ops nfs4_setclientid_ops = { 6436 .rpc_call_done = nfs4_setclientid_done, 6437 }; 6438 6439 /** 6440 * nfs4_proc_setclientid - Negotiate client ID 6441 * @clp: state data structure 6442 * @program: RPC program for NFSv4 callback service 6443 * @port: IP port number for NFS4 callback service 6444 * @cred: credential to use for this call 6445 * @res: where to place the result 6446 * 6447 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6448 */ 6449 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6450 unsigned short port, const struct cred *cred, 6451 struct nfs4_setclientid_res *res) 6452 { 6453 nfs4_verifier sc_verifier; 6454 struct nfs4_setclientid setclientid = { 6455 .sc_verifier = &sc_verifier, 6456 .sc_prog = program, 6457 .sc_clnt = clp, 6458 }; 6459 struct rpc_message msg = { 6460 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6461 .rpc_argp = &setclientid, 6462 .rpc_resp = res, 6463 .rpc_cred = cred, 6464 }; 6465 struct rpc_task_setup task_setup_data = { 6466 .rpc_client = clp->cl_rpcclient, 6467 .rpc_message = &msg, 6468 .callback_ops = &nfs4_setclientid_ops, 6469 .callback_data = &setclientid, 6470 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6471 }; 6472 unsigned long now = jiffies; 6473 int status; 6474 6475 /* nfs_client_id4 */ 6476 nfs4_init_boot_verifier(clp, &sc_verifier); 6477 6478 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6479 status = nfs4_init_uniform_client_string(clp); 6480 else 6481 status = nfs4_init_nonuniform_client_string(clp); 6482 6483 if (status) 6484 goto out; 6485 6486 /* cb_client4 */ 6487 setclientid.sc_netid_len = 6488 nfs4_init_callback_netid(clp, 6489 setclientid.sc_netid, 6490 sizeof(setclientid.sc_netid)); 6491 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6492 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6493 clp->cl_ipaddr, port >> 8, port & 255); 6494 6495 dprintk("NFS call setclientid auth=%s, '%s'\n", 6496 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6497 clp->cl_owner_id); 6498 6499 status = nfs4_call_sync_custom(&task_setup_data); 6500 if (setclientid.sc_cred) { 6501 kfree(clp->cl_acceptor); 6502 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6503 put_rpccred(setclientid.sc_cred); 6504 } 6505 6506 if (status == 0) 6507 do_renew_lease(clp, now); 6508 out: 6509 trace_nfs4_setclientid(clp, status); 6510 dprintk("NFS reply setclientid: %d\n", status); 6511 return status; 6512 } 6513 6514 /** 6515 * nfs4_proc_setclientid_confirm - Confirm client ID 6516 * @clp: state data structure 6517 * @arg: result of a previous SETCLIENTID 6518 * @cred: credential to use for this call 6519 * 6520 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6521 */ 6522 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6523 struct nfs4_setclientid_res *arg, 6524 const struct cred *cred) 6525 { 6526 struct rpc_message msg = { 6527 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6528 .rpc_argp = arg, 6529 .rpc_cred = cred, 6530 }; 6531 int status; 6532 6533 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6534 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6535 clp->cl_clientid); 6536 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6537 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6538 trace_nfs4_setclientid_confirm(clp, status); 6539 dprintk("NFS reply setclientid_confirm: %d\n", status); 6540 return status; 6541 } 6542 6543 struct nfs4_delegreturndata { 6544 struct nfs4_delegreturnargs args; 6545 struct nfs4_delegreturnres res; 6546 struct nfs_fh fh; 6547 nfs4_stateid stateid; 6548 unsigned long timestamp; 6549 struct { 6550 struct nfs4_layoutreturn_args arg; 6551 struct nfs4_layoutreturn_res res; 6552 struct nfs4_xdr_opaque_data ld_private; 6553 u32 roc_barrier; 6554 bool roc; 6555 } lr; 6556 struct nfs_fattr fattr; 6557 int rpc_status; 6558 struct inode *inode; 6559 }; 6560 6561 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6562 { 6563 struct nfs4_delegreturndata *data = calldata; 6564 struct nfs4_exception exception = { 6565 .inode = data->inode, 6566 .stateid = &data->stateid, 6567 .task_is_privileged = data->args.seq_args.sa_privileged, 6568 }; 6569 6570 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6571 return; 6572 6573 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6574 6575 /* Handle Layoutreturn errors */ 6576 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6577 &data->res.lr_ret) == -EAGAIN) 6578 goto out_restart; 6579 6580 switch (task->tk_status) { 6581 case 0: 6582 renew_lease(data->res.server, data->timestamp); 6583 break; 6584 case -NFS4ERR_ADMIN_REVOKED: 6585 case -NFS4ERR_DELEG_REVOKED: 6586 case -NFS4ERR_EXPIRED: 6587 nfs4_free_revoked_stateid(data->res.server, 6588 data->args.stateid, 6589 task->tk_msg.rpc_cred); 6590 fallthrough; 6591 case -NFS4ERR_BAD_STATEID: 6592 case -NFS4ERR_STALE_STATEID: 6593 case -ETIMEDOUT: 6594 task->tk_status = 0; 6595 break; 6596 case -NFS4ERR_OLD_STATEID: 6597 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6598 nfs4_stateid_seqid_inc(&data->stateid); 6599 if (data->args.bitmask) { 6600 data->args.bitmask = NULL; 6601 data->res.fattr = NULL; 6602 } 6603 goto out_restart; 6604 case -NFS4ERR_ACCESS: 6605 if (data->args.bitmask) { 6606 data->args.bitmask = NULL; 6607 data->res.fattr = NULL; 6608 goto out_restart; 6609 } 6610 fallthrough; 6611 default: 6612 task->tk_status = nfs4_async_handle_exception(task, 6613 data->res.server, task->tk_status, 6614 &exception); 6615 if (exception.retry) 6616 goto out_restart; 6617 } 6618 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6619 data->rpc_status = task->tk_status; 6620 return; 6621 out_restart: 6622 task->tk_status = 0; 6623 rpc_restart_call_prepare(task); 6624 } 6625 6626 static void nfs4_delegreturn_release(void *calldata) 6627 { 6628 struct nfs4_delegreturndata *data = calldata; 6629 struct inode *inode = data->inode; 6630 6631 if (data->lr.roc) 6632 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6633 data->res.lr_ret); 6634 if (inode) { 6635 nfs4_fattr_set_prechange(&data->fattr, 6636 inode_peek_iversion_raw(inode)); 6637 nfs_refresh_inode(inode, &data->fattr); 6638 nfs_iput_and_deactive(inode); 6639 } 6640 kfree(calldata); 6641 } 6642 6643 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6644 { 6645 struct nfs4_delegreturndata *d_data; 6646 struct pnfs_layout_hdr *lo; 6647 6648 d_data = data; 6649 6650 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6651 nfs4_sequence_done(task, &d_data->res.seq_res); 6652 return; 6653 } 6654 6655 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6656 if (lo && !pnfs_layout_is_valid(lo)) { 6657 d_data->args.lr_args = NULL; 6658 d_data->res.lr_res = NULL; 6659 } 6660 6661 nfs4_setup_sequence(d_data->res.server->nfs_client, 6662 &d_data->args.seq_args, 6663 &d_data->res.seq_res, 6664 task); 6665 } 6666 6667 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6668 .rpc_call_prepare = nfs4_delegreturn_prepare, 6669 .rpc_call_done = nfs4_delegreturn_done, 6670 .rpc_release = nfs4_delegreturn_release, 6671 }; 6672 6673 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6674 { 6675 struct nfs4_delegreturndata *data; 6676 struct nfs_server *server = NFS_SERVER(inode); 6677 struct rpc_task *task; 6678 struct rpc_message msg = { 6679 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6680 .rpc_cred = cred, 6681 }; 6682 struct rpc_task_setup task_setup_data = { 6683 .rpc_client = server->client, 6684 .rpc_message = &msg, 6685 .callback_ops = &nfs4_delegreturn_ops, 6686 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6687 }; 6688 int status = 0; 6689 6690 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6691 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6692 6693 data = kzalloc(sizeof(*data), GFP_KERNEL); 6694 if (data == NULL) 6695 return -ENOMEM; 6696 6697 nfs4_state_protect(server->nfs_client, 6698 NFS_SP4_MACH_CRED_CLEANUP, 6699 &task_setup_data.rpc_client, &msg); 6700 6701 data->args.fhandle = &data->fh; 6702 data->args.stateid = &data->stateid; 6703 nfs4_bitmask_set(data->args.bitmask_store, 6704 server->cache_consistency_bitmask, inode, 0); 6705 data->args.bitmask = data->args.bitmask_store; 6706 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6707 nfs4_stateid_copy(&data->stateid, stateid); 6708 data->res.fattr = &data->fattr; 6709 data->res.server = server; 6710 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6711 data->lr.arg.ld_private = &data->lr.ld_private; 6712 nfs_fattr_init(data->res.fattr); 6713 data->timestamp = jiffies; 6714 data->rpc_status = 0; 6715 data->inode = nfs_igrab_and_active(inode); 6716 if (data->inode || issync) { 6717 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6718 cred); 6719 if (data->lr.roc) { 6720 data->args.lr_args = &data->lr.arg; 6721 data->res.lr_res = &data->lr.res; 6722 } 6723 } 6724 6725 if (!data->inode) 6726 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6727 1); 6728 else 6729 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6730 0); 6731 task_setup_data.callback_data = data; 6732 msg.rpc_argp = &data->args; 6733 msg.rpc_resp = &data->res; 6734 task = rpc_run_task(&task_setup_data); 6735 if (IS_ERR(task)) 6736 return PTR_ERR(task); 6737 if (!issync) 6738 goto out; 6739 status = rpc_wait_for_completion_task(task); 6740 if (status != 0) 6741 goto out; 6742 status = data->rpc_status; 6743 out: 6744 rpc_put_task(task); 6745 return status; 6746 } 6747 6748 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6749 { 6750 struct nfs_server *server = NFS_SERVER(inode); 6751 struct nfs4_exception exception = { }; 6752 int err; 6753 do { 6754 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6755 trace_nfs4_delegreturn(inode, stateid, err); 6756 switch (err) { 6757 case -NFS4ERR_STALE_STATEID: 6758 case -NFS4ERR_EXPIRED: 6759 case 0: 6760 return 0; 6761 } 6762 err = nfs4_handle_exception(server, err, &exception); 6763 } while (exception.retry); 6764 return err; 6765 } 6766 6767 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6768 { 6769 struct inode *inode = state->inode; 6770 struct nfs_server *server = NFS_SERVER(inode); 6771 struct nfs_client *clp = server->nfs_client; 6772 struct nfs_lockt_args arg = { 6773 .fh = NFS_FH(inode), 6774 .fl = request, 6775 }; 6776 struct nfs_lockt_res res = { 6777 .denied = request, 6778 }; 6779 struct rpc_message msg = { 6780 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6781 .rpc_argp = &arg, 6782 .rpc_resp = &res, 6783 .rpc_cred = state->owner->so_cred, 6784 }; 6785 struct nfs4_lock_state *lsp; 6786 int status; 6787 6788 arg.lock_owner.clientid = clp->cl_clientid; 6789 status = nfs4_set_lock_state(state, request); 6790 if (status != 0) 6791 goto out; 6792 lsp = request->fl_u.nfs4_fl.owner; 6793 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6794 arg.lock_owner.s_dev = server->s_dev; 6795 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6796 switch (status) { 6797 case 0: 6798 request->fl_type = F_UNLCK; 6799 break; 6800 case -NFS4ERR_DENIED: 6801 status = 0; 6802 } 6803 request->fl_ops->fl_release_private(request); 6804 request->fl_ops = NULL; 6805 out: 6806 return status; 6807 } 6808 6809 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6810 { 6811 struct nfs4_exception exception = { 6812 .interruptible = true, 6813 }; 6814 int err; 6815 6816 do { 6817 err = _nfs4_proc_getlk(state, cmd, request); 6818 trace_nfs4_get_lock(request, state, cmd, err); 6819 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6820 &exception); 6821 } while (exception.retry); 6822 return err; 6823 } 6824 6825 /* 6826 * Update the seqid of a lock stateid after receiving 6827 * NFS4ERR_OLD_STATEID 6828 */ 6829 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6830 struct nfs4_lock_state *lsp) 6831 { 6832 struct nfs4_state *state = lsp->ls_state; 6833 bool ret = false; 6834 6835 spin_lock(&state->state_lock); 6836 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6837 goto out; 6838 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6839 nfs4_stateid_seqid_inc(dst); 6840 else 6841 dst->seqid = lsp->ls_stateid.seqid; 6842 ret = true; 6843 out: 6844 spin_unlock(&state->state_lock); 6845 return ret; 6846 } 6847 6848 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6849 struct nfs4_lock_state *lsp) 6850 { 6851 struct nfs4_state *state = lsp->ls_state; 6852 bool ret; 6853 6854 spin_lock(&state->state_lock); 6855 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6856 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6857 spin_unlock(&state->state_lock); 6858 return ret; 6859 } 6860 6861 struct nfs4_unlockdata { 6862 struct nfs_locku_args arg; 6863 struct nfs_locku_res res; 6864 struct nfs4_lock_state *lsp; 6865 struct nfs_open_context *ctx; 6866 struct nfs_lock_context *l_ctx; 6867 struct file_lock fl; 6868 struct nfs_server *server; 6869 unsigned long timestamp; 6870 }; 6871 6872 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6873 struct nfs_open_context *ctx, 6874 struct nfs4_lock_state *lsp, 6875 struct nfs_seqid *seqid) 6876 { 6877 struct nfs4_unlockdata *p; 6878 struct nfs4_state *state = lsp->ls_state; 6879 struct inode *inode = state->inode; 6880 6881 p = kzalloc(sizeof(*p), GFP_KERNEL); 6882 if (p == NULL) 6883 return NULL; 6884 p->arg.fh = NFS_FH(inode); 6885 p->arg.fl = &p->fl; 6886 p->arg.seqid = seqid; 6887 p->res.seqid = seqid; 6888 p->lsp = lsp; 6889 /* Ensure we don't close file until we're done freeing locks! */ 6890 p->ctx = get_nfs_open_context(ctx); 6891 p->l_ctx = nfs_get_lock_context(ctx); 6892 locks_init_lock(&p->fl); 6893 locks_copy_lock(&p->fl, fl); 6894 p->server = NFS_SERVER(inode); 6895 spin_lock(&state->state_lock); 6896 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6897 spin_unlock(&state->state_lock); 6898 return p; 6899 } 6900 6901 static void nfs4_locku_release_calldata(void *data) 6902 { 6903 struct nfs4_unlockdata *calldata = data; 6904 nfs_free_seqid(calldata->arg.seqid); 6905 nfs4_put_lock_state(calldata->lsp); 6906 nfs_put_lock_context(calldata->l_ctx); 6907 put_nfs_open_context(calldata->ctx); 6908 kfree(calldata); 6909 } 6910 6911 static void nfs4_locku_done(struct rpc_task *task, void *data) 6912 { 6913 struct nfs4_unlockdata *calldata = data; 6914 struct nfs4_exception exception = { 6915 .inode = calldata->lsp->ls_state->inode, 6916 .stateid = &calldata->arg.stateid, 6917 }; 6918 6919 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6920 return; 6921 switch (task->tk_status) { 6922 case 0: 6923 renew_lease(calldata->server, calldata->timestamp); 6924 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6925 if (nfs4_update_lock_stateid(calldata->lsp, 6926 &calldata->res.stateid)) 6927 break; 6928 fallthrough; 6929 case -NFS4ERR_ADMIN_REVOKED: 6930 case -NFS4ERR_EXPIRED: 6931 nfs4_free_revoked_stateid(calldata->server, 6932 &calldata->arg.stateid, 6933 task->tk_msg.rpc_cred); 6934 fallthrough; 6935 case -NFS4ERR_BAD_STATEID: 6936 case -NFS4ERR_STALE_STATEID: 6937 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6938 calldata->lsp)) 6939 rpc_restart_call_prepare(task); 6940 break; 6941 case -NFS4ERR_OLD_STATEID: 6942 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6943 calldata->lsp)) 6944 rpc_restart_call_prepare(task); 6945 break; 6946 default: 6947 task->tk_status = nfs4_async_handle_exception(task, 6948 calldata->server, task->tk_status, 6949 &exception); 6950 if (exception.retry) 6951 rpc_restart_call_prepare(task); 6952 } 6953 nfs_release_seqid(calldata->arg.seqid); 6954 } 6955 6956 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6957 { 6958 struct nfs4_unlockdata *calldata = data; 6959 6960 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6961 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6962 return; 6963 6964 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6965 goto out_wait; 6966 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6967 /* Note: exit _without_ running nfs4_locku_done */ 6968 goto out_no_action; 6969 } 6970 calldata->timestamp = jiffies; 6971 if (nfs4_setup_sequence(calldata->server->nfs_client, 6972 &calldata->arg.seq_args, 6973 &calldata->res.seq_res, 6974 task) != 0) 6975 nfs_release_seqid(calldata->arg.seqid); 6976 return; 6977 out_no_action: 6978 task->tk_action = NULL; 6979 out_wait: 6980 nfs4_sequence_done(task, &calldata->res.seq_res); 6981 } 6982 6983 static const struct rpc_call_ops nfs4_locku_ops = { 6984 .rpc_call_prepare = nfs4_locku_prepare, 6985 .rpc_call_done = nfs4_locku_done, 6986 .rpc_release = nfs4_locku_release_calldata, 6987 }; 6988 6989 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6990 struct nfs_open_context *ctx, 6991 struct nfs4_lock_state *lsp, 6992 struct nfs_seqid *seqid) 6993 { 6994 struct nfs4_unlockdata *data; 6995 struct rpc_message msg = { 6996 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6997 .rpc_cred = ctx->cred, 6998 }; 6999 struct rpc_task_setup task_setup_data = { 7000 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 7001 .rpc_message = &msg, 7002 .callback_ops = &nfs4_locku_ops, 7003 .workqueue = nfsiod_workqueue, 7004 .flags = RPC_TASK_ASYNC, 7005 }; 7006 7007 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 7008 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7009 7010 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 7011 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 7012 7013 /* Ensure this is an unlock - when canceling a lock, the 7014 * canceled lock is passed in, and it won't be an unlock. 7015 */ 7016 fl->fl_type = F_UNLCK; 7017 if (fl->fl_flags & FL_CLOSE) 7018 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 7019 7020 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7021 if (data == NULL) { 7022 nfs_free_seqid(seqid); 7023 return ERR_PTR(-ENOMEM); 7024 } 7025 7026 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7027 msg.rpc_argp = &data->arg; 7028 msg.rpc_resp = &data->res; 7029 task_setup_data.callback_data = data; 7030 return rpc_run_task(&task_setup_data); 7031 } 7032 7033 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7034 { 7035 struct inode *inode = state->inode; 7036 struct nfs4_state_owner *sp = state->owner; 7037 struct nfs_inode *nfsi = NFS_I(inode); 7038 struct nfs_seqid *seqid; 7039 struct nfs4_lock_state *lsp; 7040 struct rpc_task *task; 7041 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7042 int status = 0; 7043 unsigned char fl_flags = request->fl_flags; 7044 7045 status = nfs4_set_lock_state(state, request); 7046 /* Unlock _before_ we do the RPC call */ 7047 request->fl_flags |= FL_EXISTS; 7048 /* Exclude nfs_delegation_claim_locks() */ 7049 mutex_lock(&sp->so_delegreturn_mutex); 7050 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7051 down_read(&nfsi->rwsem); 7052 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7053 up_read(&nfsi->rwsem); 7054 mutex_unlock(&sp->so_delegreturn_mutex); 7055 goto out; 7056 } 7057 lsp = request->fl_u.nfs4_fl.owner; 7058 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7059 up_read(&nfsi->rwsem); 7060 mutex_unlock(&sp->so_delegreturn_mutex); 7061 if (status != 0) 7062 goto out; 7063 /* Is this a delegated lock? */ 7064 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7065 goto out; 7066 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7067 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7068 status = -ENOMEM; 7069 if (IS_ERR(seqid)) 7070 goto out; 7071 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7072 status = PTR_ERR(task); 7073 if (IS_ERR(task)) 7074 goto out; 7075 status = rpc_wait_for_completion_task(task); 7076 rpc_put_task(task); 7077 out: 7078 request->fl_flags = fl_flags; 7079 trace_nfs4_unlock(request, state, F_SETLK, status); 7080 return status; 7081 } 7082 7083 struct nfs4_lockdata { 7084 struct nfs_lock_args arg; 7085 struct nfs_lock_res res; 7086 struct nfs4_lock_state *lsp; 7087 struct nfs_open_context *ctx; 7088 struct file_lock fl; 7089 unsigned long timestamp; 7090 int rpc_status; 7091 int cancelled; 7092 struct nfs_server *server; 7093 }; 7094 7095 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7096 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7097 gfp_t gfp_mask) 7098 { 7099 struct nfs4_lockdata *p; 7100 struct inode *inode = lsp->ls_state->inode; 7101 struct nfs_server *server = NFS_SERVER(inode); 7102 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7103 7104 p = kzalloc(sizeof(*p), gfp_mask); 7105 if (p == NULL) 7106 return NULL; 7107 7108 p->arg.fh = NFS_FH(inode); 7109 p->arg.fl = &p->fl; 7110 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7111 if (IS_ERR(p->arg.open_seqid)) 7112 goto out_free; 7113 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7114 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7115 if (IS_ERR(p->arg.lock_seqid)) 7116 goto out_free_seqid; 7117 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7118 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7119 p->arg.lock_owner.s_dev = server->s_dev; 7120 p->res.lock_seqid = p->arg.lock_seqid; 7121 p->lsp = lsp; 7122 p->server = server; 7123 p->ctx = get_nfs_open_context(ctx); 7124 locks_init_lock(&p->fl); 7125 locks_copy_lock(&p->fl, fl); 7126 return p; 7127 out_free_seqid: 7128 nfs_free_seqid(p->arg.open_seqid); 7129 out_free: 7130 kfree(p); 7131 return NULL; 7132 } 7133 7134 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7135 { 7136 struct nfs4_lockdata *data = calldata; 7137 struct nfs4_state *state = data->lsp->ls_state; 7138 7139 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7140 goto out_wait; 7141 /* Do we need to do an open_to_lock_owner? */ 7142 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7143 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7144 goto out_release_lock_seqid; 7145 } 7146 nfs4_stateid_copy(&data->arg.open_stateid, 7147 &state->open_stateid); 7148 data->arg.new_lock_owner = 1; 7149 data->res.open_seqid = data->arg.open_seqid; 7150 } else { 7151 data->arg.new_lock_owner = 0; 7152 nfs4_stateid_copy(&data->arg.lock_stateid, 7153 &data->lsp->ls_stateid); 7154 } 7155 if (!nfs4_valid_open_stateid(state)) { 7156 data->rpc_status = -EBADF; 7157 task->tk_action = NULL; 7158 goto out_release_open_seqid; 7159 } 7160 data->timestamp = jiffies; 7161 if (nfs4_setup_sequence(data->server->nfs_client, 7162 &data->arg.seq_args, 7163 &data->res.seq_res, 7164 task) == 0) 7165 return; 7166 out_release_open_seqid: 7167 nfs_release_seqid(data->arg.open_seqid); 7168 out_release_lock_seqid: 7169 nfs_release_seqid(data->arg.lock_seqid); 7170 out_wait: 7171 nfs4_sequence_done(task, &data->res.seq_res); 7172 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7173 } 7174 7175 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7176 { 7177 struct nfs4_lockdata *data = calldata; 7178 struct nfs4_lock_state *lsp = data->lsp; 7179 7180 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7181 return; 7182 7183 data->rpc_status = task->tk_status; 7184 switch (task->tk_status) { 7185 case 0: 7186 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7187 data->timestamp); 7188 if (data->arg.new_lock && !data->cancelled) { 7189 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7190 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7191 goto out_restart; 7192 } 7193 if (data->arg.new_lock_owner != 0) { 7194 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7195 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7196 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7197 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7198 goto out_restart; 7199 break; 7200 case -NFS4ERR_OLD_STATEID: 7201 if (data->arg.new_lock_owner != 0 && 7202 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7203 lsp->ls_state)) 7204 goto out_restart; 7205 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7206 goto out_restart; 7207 fallthrough; 7208 case -NFS4ERR_BAD_STATEID: 7209 case -NFS4ERR_STALE_STATEID: 7210 case -NFS4ERR_EXPIRED: 7211 if (data->arg.new_lock_owner != 0) { 7212 if (!nfs4_stateid_match(&data->arg.open_stateid, 7213 &lsp->ls_state->open_stateid)) 7214 goto out_restart; 7215 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7216 &lsp->ls_stateid)) 7217 goto out_restart; 7218 } 7219 out_done: 7220 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7221 return; 7222 out_restart: 7223 if (!data->cancelled) 7224 rpc_restart_call_prepare(task); 7225 goto out_done; 7226 } 7227 7228 static void nfs4_lock_release(void *calldata) 7229 { 7230 struct nfs4_lockdata *data = calldata; 7231 7232 nfs_free_seqid(data->arg.open_seqid); 7233 if (data->cancelled && data->rpc_status == 0) { 7234 struct rpc_task *task; 7235 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7236 data->arg.lock_seqid); 7237 if (!IS_ERR(task)) 7238 rpc_put_task_async(task); 7239 dprintk("%s: cancelling lock!\n", __func__); 7240 } else 7241 nfs_free_seqid(data->arg.lock_seqid); 7242 nfs4_put_lock_state(data->lsp); 7243 put_nfs_open_context(data->ctx); 7244 kfree(data); 7245 } 7246 7247 static const struct rpc_call_ops nfs4_lock_ops = { 7248 .rpc_call_prepare = nfs4_lock_prepare, 7249 .rpc_call_done = nfs4_lock_done, 7250 .rpc_release = nfs4_lock_release, 7251 }; 7252 7253 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7254 { 7255 switch (error) { 7256 case -NFS4ERR_ADMIN_REVOKED: 7257 case -NFS4ERR_EXPIRED: 7258 case -NFS4ERR_BAD_STATEID: 7259 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7260 if (new_lock_owner != 0 || 7261 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7262 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7263 break; 7264 case -NFS4ERR_STALE_STATEID: 7265 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7266 nfs4_schedule_lease_recovery(server->nfs_client); 7267 } 7268 } 7269 7270 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7271 { 7272 struct nfs4_lockdata *data; 7273 struct rpc_task *task; 7274 struct rpc_message msg = { 7275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7276 .rpc_cred = state->owner->so_cred, 7277 }; 7278 struct rpc_task_setup task_setup_data = { 7279 .rpc_client = NFS_CLIENT(state->inode), 7280 .rpc_message = &msg, 7281 .callback_ops = &nfs4_lock_ops, 7282 .workqueue = nfsiod_workqueue, 7283 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7284 }; 7285 int ret; 7286 7287 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7288 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7289 7290 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7291 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7292 if (data == NULL) 7293 return -ENOMEM; 7294 if (IS_SETLKW(cmd)) 7295 data->arg.block = 1; 7296 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7297 recovery_type > NFS_LOCK_NEW); 7298 msg.rpc_argp = &data->arg; 7299 msg.rpc_resp = &data->res; 7300 task_setup_data.callback_data = data; 7301 if (recovery_type > NFS_LOCK_NEW) { 7302 if (recovery_type == NFS_LOCK_RECLAIM) 7303 data->arg.reclaim = NFS_LOCK_RECLAIM; 7304 } else 7305 data->arg.new_lock = 1; 7306 task = rpc_run_task(&task_setup_data); 7307 if (IS_ERR(task)) 7308 return PTR_ERR(task); 7309 ret = rpc_wait_for_completion_task(task); 7310 if (ret == 0) { 7311 ret = data->rpc_status; 7312 if (ret) 7313 nfs4_handle_setlk_error(data->server, data->lsp, 7314 data->arg.new_lock_owner, ret); 7315 } else 7316 data->cancelled = true; 7317 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7318 rpc_put_task(task); 7319 dprintk("%s: ret = %d\n", __func__, ret); 7320 return ret; 7321 } 7322 7323 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7324 { 7325 struct nfs_server *server = NFS_SERVER(state->inode); 7326 struct nfs4_exception exception = { 7327 .inode = state->inode, 7328 }; 7329 int err; 7330 7331 do { 7332 /* Cache the lock if possible... */ 7333 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7334 return 0; 7335 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7336 if (err != -NFS4ERR_DELAY) 7337 break; 7338 nfs4_handle_exception(server, err, &exception); 7339 } while (exception.retry); 7340 return err; 7341 } 7342 7343 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7344 { 7345 struct nfs_server *server = NFS_SERVER(state->inode); 7346 struct nfs4_exception exception = { 7347 .inode = state->inode, 7348 }; 7349 int err; 7350 7351 err = nfs4_set_lock_state(state, request); 7352 if (err != 0) 7353 return err; 7354 if (!recover_lost_locks) { 7355 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7356 return 0; 7357 } 7358 do { 7359 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7360 return 0; 7361 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7362 switch (err) { 7363 default: 7364 goto out; 7365 case -NFS4ERR_GRACE: 7366 case -NFS4ERR_DELAY: 7367 nfs4_handle_exception(server, err, &exception); 7368 err = 0; 7369 } 7370 } while (exception.retry); 7371 out: 7372 return err; 7373 } 7374 7375 #if defined(CONFIG_NFS_V4_1) 7376 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7377 { 7378 struct nfs4_lock_state *lsp; 7379 int status; 7380 7381 status = nfs4_set_lock_state(state, request); 7382 if (status != 0) 7383 return status; 7384 lsp = request->fl_u.nfs4_fl.owner; 7385 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7386 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7387 return 0; 7388 return nfs4_lock_expired(state, request); 7389 } 7390 #endif 7391 7392 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7393 { 7394 struct nfs_inode *nfsi = NFS_I(state->inode); 7395 struct nfs4_state_owner *sp = state->owner; 7396 unsigned char fl_flags = request->fl_flags; 7397 int status; 7398 7399 request->fl_flags |= FL_ACCESS; 7400 status = locks_lock_inode_wait(state->inode, request); 7401 if (status < 0) 7402 goto out; 7403 mutex_lock(&sp->so_delegreturn_mutex); 7404 down_read(&nfsi->rwsem); 7405 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7406 /* Yes: cache locks! */ 7407 /* ...but avoid races with delegation recall... */ 7408 request->fl_flags = fl_flags & ~FL_SLEEP; 7409 status = locks_lock_inode_wait(state->inode, request); 7410 up_read(&nfsi->rwsem); 7411 mutex_unlock(&sp->so_delegreturn_mutex); 7412 goto out; 7413 } 7414 up_read(&nfsi->rwsem); 7415 mutex_unlock(&sp->so_delegreturn_mutex); 7416 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7417 out: 7418 request->fl_flags = fl_flags; 7419 return status; 7420 } 7421 7422 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7423 { 7424 struct nfs4_exception exception = { 7425 .state = state, 7426 .inode = state->inode, 7427 .interruptible = true, 7428 }; 7429 int err; 7430 7431 do { 7432 err = _nfs4_proc_setlk(state, cmd, request); 7433 if (err == -NFS4ERR_DENIED) 7434 err = -EAGAIN; 7435 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7436 err, &exception); 7437 } while (exception.retry); 7438 return err; 7439 } 7440 7441 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7442 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7443 7444 static int 7445 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7446 struct file_lock *request) 7447 { 7448 int status = -ERESTARTSYS; 7449 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7450 7451 while(!signalled()) { 7452 status = nfs4_proc_setlk(state, cmd, request); 7453 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7454 break; 7455 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7456 schedule_timeout(timeout); 7457 timeout *= 2; 7458 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7459 status = -ERESTARTSYS; 7460 } 7461 return status; 7462 } 7463 7464 #ifdef CONFIG_NFS_V4_1 7465 struct nfs4_lock_waiter { 7466 struct inode *inode; 7467 struct nfs_lowner owner; 7468 wait_queue_entry_t wait; 7469 }; 7470 7471 static int 7472 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7473 { 7474 struct nfs4_lock_waiter *waiter = 7475 container_of(wait, struct nfs4_lock_waiter, wait); 7476 7477 /* NULL key means to wake up everyone */ 7478 if (key) { 7479 struct cb_notify_lock_args *cbnl = key; 7480 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7481 *wowner = &waiter->owner; 7482 7483 /* Only wake if the callback was for the same owner. */ 7484 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7485 return 0; 7486 7487 /* Make sure it's for the right inode */ 7488 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7489 return 0; 7490 } 7491 7492 return woken_wake_function(wait, mode, flags, key); 7493 } 7494 7495 static int 7496 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7497 { 7498 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7499 struct nfs_server *server = NFS_SERVER(state->inode); 7500 struct nfs_client *clp = server->nfs_client; 7501 wait_queue_head_t *q = &clp->cl_lock_waitq; 7502 struct nfs4_lock_waiter waiter = { 7503 .inode = state->inode, 7504 .owner = { .clientid = clp->cl_clientid, 7505 .id = lsp->ls_seqid.owner_id, 7506 .s_dev = server->s_dev }, 7507 }; 7508 int status; 7509 7510 /* Don't bother with waitqueue if we don't expect a callback */ 7511 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7512 return nfs4_retry_setlk_simple(state, cmd, request); 7513 7514 init_wait(&waiter.wait); 7515 waiter.wait.func = nfs4_wake_lock_waiter; 7516 add_wait_queue(q, &waiter.wait); 7517 7518 do { 7519 status = nfs4_proc_setlk(state, cmd, request); 7520 if (status != -EAGAIN || IS_SETLK(cmd)) 7521 break; 7522 7523 status = -ERESTARTSYS; 7524 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7525 NFS4_LOCK_MAXTIMEOUT); 7526 } while (!signalled()); 7527 7528 remove_wait_queue(q, &waiter.wait); 7529 7530 return status; 7531 } 7532 #else /* !CONFIG_NFS_V4_1 */ 7533 static inline int 7534 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7535 { 7536 return nfs4_retry_setlk_simple(state, cmd, request); 7537 } 7538 #endif 7539 7540 static int 7541 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7542 { 7543 struct nfs_open_context *ctx; 7544 struct nfs4_state *state; 7545 int status; 7546 7547 /* verify open state */ 7548 ctx = nfs_file_open_context(filp); 7549 state = ctx->state; 7550 7551 if (IS_GETLK(cmd)) { 7552 if (state != NULL) 7553 return nfs4_proc_getlk(state, F_GETLK, request); 7554 return 0; 7555 } 7556 7557 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7558 return -EINVAL; 7559 7560 if (request->fl_type == F_UNLCK) { 7561 if (state != NULL) 7562 return nfs4_proc_unlck(state, cmd, request); 7563 return 0; 7564 } 7565 7566 if (state == NULL) 7567 return -ENOLCK; 7568 7569 if ((request->fl_flags & FL_POSIX) && 7570 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7571 return -ENOLCK; 7572 7573 /* 7574 * Don't rely on the VFS having checked the file open mode, 7575 * since it won't do this for flock() locks. 7576 */ 7577 switch (request->fl_type) { 7578 case F_RDLCK: 7579 if (!(filp->f_mode & FMODE_READ)) 7580 return -EBADF; 7581 break; 7582 case F_WRLCK: 7583 if (!(filp->f_mode & FMODE_WRITE)) 7584 return -EBADF; 7585 } 7586 7587 status = nfs4_set_lock_state(state, request); 7588 if (status != 0) 7589 return status; 7590 7591 return nfs4_retry_setlk(state, cmd, request); 7592 } 7593 7594 static int nfs4_delete_lease(struct file *file, void **priv) 7595 { 7596 return generic_setlease(file, F_UNLCK, NULL, priv); 7597 } 7598 7599 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease, 7600 void **priv) 7601 { 7602 struct inode *inode = file_inode(file); 7603 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7604 int ret; 7605 7606 /* No delegation, no lease */ 7607 if (!nfs4_have_delegation(inode, type)) 7608 return -EAGAIN; 7609 ret = generic_setlease(file, arg, lease, priv); 7610 if (ret || nfs4_have_delegation(inode, type)) 7611 return ret; 7612 /* We raced with a delegation return */ 7613 nfs4_delete_lease(file, priv); 7614 return -EAGAIN; 7615 } 7616 7617 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease, 7618 void **priv) 7619 { 7620 switch (arg) { 7621 case F_RDLCK: 7622 case F_WRLCK: 7623 return nfs4_add_lease(file, arg, lease, priv); 7624 case F_UNLCK: 7625 return nfs4_delete_lease(file, priv); 7626 default: 7627 return -EINVAL; 7628 } 7629 } 7630 7631 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7632 { 7633 struct nfs_server *server = NFS_SERVER(state->inode); 7634 int err; 7635 7636 err = nfs4_set_lock_state(state, fl); 7637 if (err != 0) 7638 return err; 7639 do { 7640 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7641 if (err != -NFS4ERR_DELAY) 7642 break; 7643 ssleep(1); 7644 } while (err == -NFS4ERR_DELAY); 7645 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7646 } 7647 7648 struct nfs_release_lockowner_data { 7649 struct nfs4_lock_state *lsp; 7650 struct nfs_server *server; 7651 struct nfs_release_lockowner_args args; 7652 struct nfs_release_lockowner_res res; 7653 unsigned long timestamp; 7654 }; 7655 7656 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7657 { 7658 struct nfs_release_lockowner_data *data = calldata; 7659 struct nfs_server *server = data->server; 7660 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7661 &data->res.seq_res, task); 7662 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7663 data->timestamp = jiffies; 7664 } 7665 7666 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7667 { 7668 struct nfs_release_lockowner_data *data = calldata; 7669 struct nfs_server *server = data->server; 7670 7671 nfs40_sequence_done(task, &data->res.seq_res); 7672 7673 switch (task->tk_status) { 7674 case 0: 7675 renew_lease(server, data->timestamp); 7676 break; 7677 case -NFS4ERR_STALE_CLIENTID: 7678 case -NFS4ERR_EXPIRED: 7679 nfs4_schedule_lease_recovery(server->nfs_client); 7680 break; 7681 case -NFS4ERR_LEASE_MOVED: 7682 case -NFS4ERR_DELAY: 7683 if (nfs4_async_handle_error(task, server, 7684 NULL, NULL) == -EAGAIN) 7685 rpc_restart_call_prepare(task); 7686 } 7687 } 7688 7689 static void nfs4_release_lockowner_release(void *calldata) 7690 { 7691 struct nfs_release_lockowner_data *data = calldata; 7692 nfs4_free_lock_state(data->server, data->lsp); 7693 kfree(calldata); 7694 } 7695 7696 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7697 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7698 .rpc_call_done = nfs4_release_lockowner_done, 7699 .rpc_release = nfs4_release_lockowner_release, 7700 }; 7701 7702 static void 7703 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7704 { 7705 struct nfs_release_lockowner_data *data; 7706 struct rpc_message msg = { 7707 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7708 }; 7709 7710 if (server->nfs_client->cl_mvops->minor_version != 0) 7711 return; 7712 7713 data = kmalloc(sizeof(*data), GFP_KERNEL); 7714 if (!data) 7715 return; 7716 data->lsp = lsp; 7717 data->server = server; 7718 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7719 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7720 data->args.lock_owner.s_dev = server->s_dev; 7721 7722 msg.rpc_argp = &data->args; 7723 msg.rpc_resp = &data->res; 7724 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7725 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7726 } 7727 7728 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7729 7730 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7731 struct mnt_idmap *idmap, 7732 struct dentry *unused, struct inode *inode, 7733 const char *key, const void *buf, 7734 size_t buflen, int flags) 7735 { 7736 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7737 } 7738 7739 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7740 struct dentry *unused, struct inode *inode, 7741 const char *key, void *buf, size_t buflen) 7742 { 7743 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7744 } 7745 7746 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7747 { 7748 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7749 } 7750 7751 #if defined(CONFIG_NFS_V4_1) 7752 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7753 7754 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7755 struct mnt_idmap *idmap, 7756 struct dentry *unused, struct inode *inode, 7757 const char *key, const void *buf, 7758 size_t buflen, int flags) 7759 { 7760 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7761 } 7762 7763 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7764 struct dentry *unused, struct inode *inode, 7765 const char *key, void *buf, size_t buflen) 7766 { 7767 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7768 } 7769 7770 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7771 { 7772 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7773 } 7774 7775 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7776 7777 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7778 struct mnt_idmap *idmap, 7779 struct dentry *unused, struct inode *inode, 7780 const char *key, const void *buf, 7781 size_t buflen, int flags) 7782 { 7783 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7784 } 7785 7786 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7787 struct dentry *unused, struct inode *inode, 7788 const char *key, void *buf, size_t buflen) 7789 { 7790 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7791 } 7792 7793 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7794 { 7795 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7796 } 7797 7798 #endif 7799 7800 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7801 7802 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7803 struct mnt_idmap *idmap, 7804 struct dentry *unused, struct inode *inode, 7805 const char *key, const void *buf, 7806 size_t buflen, int flags) 7807 { 7808 if (security_ismaclabel(key)) 7809 return nfs4_set_security_label(inode, buf, buflen); 7810 7811 return -EOPNOTSUPP; 7812 } 7813 7814 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7815 struct dentry *unused, struct inode *inode, 7816 const char *key, void *buf, size_t buflen) 7817 { 7818 if (security_ismaclabel(key)) 7819 return nfs4_get_security_label(inode, buf, buflen); 7820 return -EOPNOTSUPP; 7821 } 7822 7823 static ssize_t 7824 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7825 { 7826 int len = 0; 7827 7828 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7829 len = security_inode_listsecurity(inode, list, list_len); 7830 if (len >= 0 && list_len && len > list_len) 7831 return -ERANGE; 7832 } 7833 return len; 7834 } 7835 7836 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7837 .prefix = XATTR_SECURITY_PREFIX, 7838 .get = nfs4_xattr_get_nfs4_label, 7839 .set = nfs4_xattr_set_nfs4_label, 7840 }; 7841 7842 #else 7843 7844 static ssize_t 7845 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7846 { 7847 return 0; 7848 } 7849 7850 #endif 7851 7852 #ifdef CONFIG_NFS_V4_2 7853 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7854 struct mnt_idmap *idmap, 7855 struct dentry *unused, struct inode *inode, 7856 const char *key, const void *buf, 7857 size_t buflen, int flags) 7858 { 7859 u32 mask; 7860 int ret; 7861 7862 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7863 return -EOPNOTSUPP; 7864 7865 /* 7866 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7867 * flags right now. Handling of xattr operations use the normal 7868 * file read/write permissions. 7869 * 7870 * Just in case the server has other ideas (which RFC 8276 allows), 7871 * do a cached access check for the XA* flags to possibly avoid 7872 * doing an RPC and getting EACCES back. 7873 */ 7874 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7875 if (!(mask & NFS_ACCESS_XAWRITE)) 7876 return -EACCES; 7877 } 7878 7879 if (buf == NULL) { 7880 ret = nfs42_proc_removexattr(inode, key); 7881 if (!ret) 7882 nfs4_xattr_cache_remove(inode, key); 7883 } else { 7884 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7885 if (!ret) 7886 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7887 } 7888 7889 return ret; 7890 } 7891 7892 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7893 struct dentry *unused, struct inode *inode, 7894 const char *key, void *buf, size_t buflen) 7895 { 7896 u32 mask; 7897 ssize_t ret; 7898 7899 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7900 return -EOPNOTSUPP; 7901 7902 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7903 if (!(mask & NFS_ACCESS_XAREAD)) 7904 return -EACCES; 7905 } 7906 7907 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7908 if (ret) 7909 return ret; 7910 7911 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7912 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7913 return ret; 7914 7915 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7916 7917 return ret; 7918 } 7919 7920 static ssize_t 7921 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7922 { 7923 u64 cookie; 7924 bool eof; 7925 ssize_t ret, size; 7926 char *buf; 7927 size_t buflen; 7928 u32 mask; 7929 7930 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7931 return 0; 7932 7933 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7934 if (!(mask & NFS_ACCESS_XALIST)) 7935 return 0; 7936 } 7937 7938 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7939 if (ret) 7940 return ret; 7941 7942 ret = nfs4_xattr_cache_list(inode, list, list_len); 7943 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7944 return ret; 7945 7946 cookie = 0; 7947 eof = false; 7948 buflen = list_len ? list_len : XATTR_LIST_MAX; 7949 buf = list_len ? list : NULL; 7950 size = 0; 7951 7952 while (!eof) { 7953 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7954 &cookie, &eof); 7955 if (ret < 0) 7956 return ret; 7957 7958 if (list_len) { 7959 buf += ret; 7960 buflen -= ret; 7961 } 7962 size += ret; 7963 } 7964 7965 if (list_len) 7966 nfs4_xattr_cache_set_list(inode, list, size); 7967 7968 return size; 7969 } 7970 7971 #else 7972 7973 static ssize_t 7974 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7975 { 7976 return 0; 7977 } 7978 #endif /* CONFIG_NFS_V4_2 */ 7979 7980 /* 7981 * nfs_fhget will use either the mounted_on_fileid or the fileid 7982 */ 7983 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7984 { 7985 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7986 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7987 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7988 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7989 return; 7990 7991 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7992 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7993 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7994 fattr->nlink = 2; 7995 } 7996 7997 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7998 const struct qstr *name, 7999 struct nfs4_fs_locations *fs_locations, 8000 struct page *page) 8001 { 8002 struct nfs_server *server = NFS_SERVER(dir); 8003 u32 bitmask[3]; 8004 struct nfs4_fs_locations_arg args = { 8005 .dir_fh = NFS_FH(dir), 8006 .name = name, 8007 .page = page, 8008 .bitmask = bitmask, 8009 }; 8010 struct nfs4_fs_locations_res res = { 8011 .fs_locations = fs_locations, 8012 }; 8013 struct rpc_message msg = { 8014 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8015 .rpc_argp = &args, 8016 .rpc_resp = &res, 8017 }; 8018 int status; 8019 8020 dprintk("%s: start\n", __func__); 8021 8022 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8023 bitmask[1] = nfs4_fattr_bitmap[1]; 8024 8025 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8026 * is not supported */ 8027 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8028 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8029 else 8030 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8031 8032 nfs_fattr_init(fs_locations->fattr); 8033 fs_locations->server = server; 8034 fs_locations->nlocations = 0; 8035 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8036 dprintk("%s: returned status = %d\n", __func__, status); 8037 return status; 8038 } 8039 8040 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8041 const struct qstr *name, 8042 struct nfs4_fs_locations *fs_locations, 8043 struct page *page) 8044 { 8045 struct nfs4_exception exception = { 8046 .interruptible = true, 8047 }; 8048 int err; 8049 do { 8050 err = _nfs4_proc_fs_locations(client, dir, name, 8051 fs_locations, page); 8052 trace_nfs4_get_fs_locations(dir, name, err); 8053 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8054 &exception); 8055 } while (exception.retry); 8056 return err; 8057 } 8058 8059 /* 8060 * This operation also signals the server that this client is 8061 * performing migration recovery. The server can stop returning 8062 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8063 * appended to this compound to identify the client ID which is 8064 * performing recovery. 8065 */ 8066 static int _nfs40_proc_get_locations(struct nfs_server *server, 8067 struct nfs_fh *fhandle, 8068 struct nfs4_fs_locations *locations, 8069 struct page *page, const struct cred *cred) 8070 { 8071 struct rpc_clnt *clnt = server->client; 8072 u32 bitmask[2] = { 8073 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8074 }; 8075 struct nfs4_fs_locations_arg args = { 8076 .clientid = server->nfs_client->cl_clientid, 8077 .fh = fhandle, 8078 .page = page, 8079 .bitmask = bitmask, 8080 .migration = 1, /* skip LOOKUP */ 8081 .renew = 1, /* append RENEW */ 8082 }; 8083 struct nfs4_fs_locations_res res = { 8084 .fs_locations = locations, 8085 .migration = 1, 8086 .renew = 1, 8087 }; 8088 struct rpc_message msg = { 8089 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8090 .rpc_argp = &args, 8091 .rpc_resp = &res, 8092 .rpc_cred = cred, 8093 }; 8094 unsigned long now = jiffies; 8095 int status; 8096 8097 nfs_fattr_init(locations->fattr); 8098 locations->server = server; 8099 locations->nlocations = 0; 8100 8101 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8102 status = nfs4_call_sync_sequence(clnt, server, &msg, 8103 &args.seq_args, &res.seq_res); 8104 if (status) 8105 return status; 8106 8107 renew_lease(server, now); 8108 return 0; 8109 } 8110 8111 #ifdef CONFIG_NFS_V4_1 8112 8113 /* 8114 * This operation also signals the server that this client is 8115 * performing migration recovery. The server can stop asserting 8116 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8117 * performing this operation is identified in the SEQUENCE 8118 * operation in this compound. 8119 * 8120 * When the client supports GETATTR(fs_locations_info), it can 8121 * be plumbed in here. 8122 */ 8123 static int _nfs41_proc_get_locations(struct nfs_server *server, 8124 struct nfs_fh *fhandle, 8125 struct nfs4_fs_locations *locations, 8126 struct page *page, const struct cred *cred) 8127 { 8128 struct rpc_clnt *clnt = server->client; 8129 u32 bitmask[2] = { 8130 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8131 }; 8132 struct nfs4_fs_locations_arg args = { 8133 .fh = fhandle, 8134 .page = page, 8135 .bitmask = bitmask, 8136 .migration = 1, /* skip LOOKUP */ 8137 }; 8138 struct nfs4_fs_locations_res res = { 8139 .fs_locations = locations, 8140 .migration = 1, 8141 }; 8142 struct rpc_message msg = { 8143 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8144 .rpc_argp = &args, 8145 .rpc_resp = &res, 8146 .rpc_cred = cred, 8147 }; 8148 struct nfs4_call_sync_data data = { 8149 .seq_server = server, 8150 .seq_args = &args.seq_args, 8151 .seq_res = &res.seq_res, 8152 }; 8153 struct rpc_task_setup task_setup_data = { 8154 .rpc_client = clnt, 8155 .rpc_message = &msg, 8156 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8157 .callback_data = &data, 8158 .flags = RPC_TASK_NO_ROUND_ROBIN, 8159 }; 8160 int status; 8161 8162 nfs_fattr_init(locations->fattr); 8163 locations->server = server; 8164 locations->nlocations = 0; 8165 8166 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8167 status = nfs4_call_sync_custom(&task_setup_data); 8168 if (status == NFS4_OK && 8169 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8170 status = -NFS4ERR_LEASE_MOVED; 8171 return status; 8172 } 8173 8174 #endif /* CONFIG_NFS_V4_1 */ 8175 8176 /** 8177 * nfs4_proc_get_locations - discover locations for a migrated FSID 8178 * @server: pointer to nfs_server to process 8179 * @fhandle: pointer to the kernel NFS client file handle 8180 * @locations: result of query 8181 * @page: buffer 8182 * @cred: credential to use for this operation 8183 * 8184 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8185 * operation failed, or a negative errno if a local error occurred. 8186 * 8187 * On success, "locations" is filled in, but if the server has 8188 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8189 * asserted. 8190 * 8191 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8192 * from this client that require migration recovery. 8193 */ 8194 int nfs4_proc_get_locations(struct nfs_server *server, 8195 struct nfs_fh *fhandle, 8196 struct nfs4_fs_locations *locations, 8197 struct page *page, const struct cred *cred) 8198 { 8199 struct nfs_client *clp = server->nfs_client; 8200 const struct nfs4_mig_recovery_ops *ops = 8201 clp->cl_mvops->mig_recovery_ops; 8202 struct nfs4_exception exception = { 8203 .interruptible = true, 8204 }; 8205 int status; 8206 8207 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8208 (unsigned long long)server->fsid.major, 8209 (unsigned long long)server->fsid.minor, 8210 clp->cl_hostname); 8211 nfs_display_fhandle(fhandle, __func__); 8212 8213 do { 8214 status = ops->get_locations(server, fhandle, locations, page, 8215 cred); 8216 if (status != -NFS4ERR_DELAY) 8217 break; 8218 nfs4_handle_exception(server, status, &exception); 8219 } while (exception.retry); 8220 return status; 8221 } 8222 8223 /* 8224 * This operation also signals the server that this client is 8225 * performing "lease moved" recovery. The server can stop 8226 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8227 * is appended to this compound to identify the client ID which is 8228 * performing recovery. 8229 */ 8230 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8231 { 8232 struct nfs_server *server = NFS_SERVER(inode); 8233 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8234 struct rpc_clnt *clnt = server->client; 8235 struct nfs4_fsid_present_arg args = { 8236 .fh = NFS_FH(inode), 8237 .clientid = clp->cl_clientid, 8238 .renew = 1, /* append RENEW */ 8239 }; 8240 struct nfs4_fsid_present_res res = { 8241 .renew = 1, 8242 }; 8243 struct rpc_message msg = { 8244 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8245 .rpc_argp = &args, 8246 .rpc_resp = &res, 8247 .rpc_cred = cred, 8248 }; 8249 unsigned long now = jiffies; 8250 int status; 8251 8252 res.fh = nfs_alloc_fhandle(); 8253 if (res.fh == NULL) 8254 return -ENOMEM; 8255 8256 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8257 status = nfs4_call_sync_sequence(clnt, server, &msg, 8258 &args.seq_args, &res.seq_res); 8259 nfs_free_fhandle(res.fh); 8260 if (status) 8261 return status; 8262 8263 do_renew_lease(clp, now); 8264 return 0; 8265 } 8266 8267 #ifdef CONFIG_NFS_V4_1 8268 8269 /* 8270 * This operation also signals the server that this client is 8271 * performing "lease moved" recovery. The server can stop asserting 8272 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8273 * this operation is identified in the SEQUENCE operation in this 8274 * compound. 8275 */ 8276 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8277 { 8278 struct nfs_server *server = NFS_SERVER(inode); 8279 struct rpc_clnt *clnt = server->client; 8280 struct nfs4_fsid_present_arg args = { 8281 .fh = NFS_FH(inode), 8282 }; 8283 struct nfs4_fsid_present_res res = { 8284 }; 8285 struct rpc_message msg = { 8286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8287 .rpc_argp = &args, 8288 .rpc_resp = &res, 8289 .rpc_cred = cred, 8290 }; 8291 int status; 8292 8293 res.fh = nfs_alloc_fhandle(); 8294 if (res.fh == NULL) 8295 return -ENOMEM; 8296 8297 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8298 status = nfs4_call_sync_sequence(clnt, server, &msg, 8299 &args.seq_args, &res.seq_res); 8300 nfs_free_fhandle(res.fh); 8301 if (status == NFS4_OK && 8302 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8303 status = -NFS4ERR_LEASE_MOVED; 8304 return status; 8305 } 8306 8307 #endif /* CONFIG_NFS_V4_1 */ 8308 8309 /** 8310 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8311 * @inode: inode on FSID to check 8312 * @cred: credential to use for this operation 8313 * 8314 * Server indicates whether the FSID is present, moved, or not 8315 * recognized. This operation is necessary to clear a LEASE_MOVED 8316 * condition for this client ID. 8317 * 8318 * Returns NFS4_OK if the FSID is present on this server, 8319 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8320 * NFS4ERR code if some error occurred on the server, or a 8321 * negative errno if a local failure occurred. 8322 */ 8323 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8324 { 8325 struct nfs_server *server = NFS_SERVER(inode); 8326 struct nfs_client *clp = server->nfs_client; 8327 const struct nfs4_mig_recovery_ops *ops = 8328 clp->cl_mvops->mig_recovery_ops; 8329 struct nfs4_exception exception = { 8330 .interruptible = true, 8331 }; 8332 int status; 8333 8334 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8335 (unsigned long long)server->fsid.major, 8336 (unsigned long long)server->fsid.minor, 8337 clp->cl_hostname); 8338 nfs_display_fhandle(NFS_FH(inode), __func__); 8339 8340 do { 8341 status = ops->fsid_present(inode, cred); 8342 if (status != -NFS4ERR_DELAY) 8343 break; 8344 nfs4_handle_exception(server, status, &exception); 8345 } while (exception.retry); 8346 return status; 8347 } 8348 8349 /* 8350 * If 'use_integrity' is true and the state managment nfs_client 8351 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8352 * and the machine credential as per RFC3530bis and RFC5661 Security 8353 * Considerations sections. Otherwise, just use the user cred with the 8354 * filesystem's rpc_client. 8355 */ 8356 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8357 { 8358 int status; 8359 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8360 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8361 struct nfs4_secinfo_arg args = { 8362 .dir_fh = NFS_FH(dir), 8363 .name = name, 8364 }; 8365 struct nfs4_secinfo_res res = { 8366 .flavors = flavors, 8367 }; 8368 struct rpc_message msg = { 8369 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8370 .rpc_argp = &args, 8371 .rpc_resp = &res, 8372 }; 8373 struct nfs4_call_sync_data data = { 8374 .seq_server = NFS_SERVER(dir), 8375 .seq_args = &args.seq_args, 8376 .seq_res = &res.seq_res, 8377 }; 8378 struct rpc_task_setup task_setup = { 8379 .rpc_client = clnt, 8380 .rpc_message = &msg, 8381 .callback_ops = clp->cl_mvops->call_sync_ops, 8382 .callback_data = &data, 8383 .flags = RPC_TASK_NO_ROUND_ROBIN, 8384 }; 8385 const struct cred *cred = NULL; 8386 8387 if (use_integrity) { 8388 clnt = clp->cl_rpcclient; 8389 task_setup.rpc_client = clnt; 8390 8391 cred = nfs4_get_clid_cred(clp); 8392 msg.rpc_cred = cred; 8393 } 8394 8395 dprintk("NFS call secinfo %s\n", name->name); 8396 8397 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8398 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8399 status = nfs4_call_sync_custom(&task_setup); 8400 8401 dprintk("NFS reply secinfo: %d\n", status); 8402 8403 put_cred(cred); 8404 return status; 8405 } 8406 8407 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8408 struct nfs4_secinfo_flavors *flavors) 8409 { 8410 struct nfs4_exception exception = { 8411 .interruptible = true, 8412 }; 8413 int err; 8414 do { 8415 err = -NFS4ERR_WRONGSEC; 8416 8417 /* try to use integrity protection with machine cred */ 8418 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8419 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8420 8421 /* 8422 * if unable to use integrity protection, or SECINFO with 8423 * integrity protection returns NFS4ERR_WRONGSEC (which is 8424 * disallowed by spec, but exists in deployed servers) use 8425 * the current filesystem's rpc_client and the user cred. 8426 */ 8427 if (err == -NFS4ERR_WRONGSEC) 8428 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8429 8430 trace_nfs4_secinfo(dir, name, err); 8431 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8432 &exception); 8433 } while (exception.retry); 8434 return err; 8435 } 8436 8437 #ifdef CONFIG_NFS_V4_1 8438 /* 8439 * Check the exchange flags returned by the server for invalid flags, having 8440 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8441 * DS flags set. 8442 */ 8443 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8444 { 8445 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8446 goto out_inval; 8447 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8448 goto out_inval; 8449 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8450 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8451 goto out_inval; 8452 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8453 goto out_inval; 8454 return NFS_OK; 8455 out_inval: 8456 return -NFS4ERR_INVAL; 8457 } 8458 8459 static bool 8460 nfs41_same_server_scope(struct nfs41_server_scope *a, 8461 struct nfs41_server_scope *b) 8462 { 8463 if (a->server_scope_sz != b->server_scope_sz) 8464 return false; 8465 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8466 } 8467 8468 static void 8469 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8470 { 8471 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8472 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8473 struct nfs_client *clp = args->client; 8474 8475 switch (task->tk_status) { 8476 case -NFS4ERR_BADSESSION: 8477 case -NFS4ERR_DEADSESSION: 8478 nfs4_schedule_session_recovery(clp->cl_session, 8479 task->tk_status); 8480 return; 8481 } 8482 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8483 res->dir != NFS4_CDFS4_BOTH) { 8484 rpc_task_close_connection(task); 8485 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8486 rpc_restart_call(task); 8487 } 8488 } 8489 8490 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8491 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8492 }; 8493 8494 /* 8495 * nfs4_proc_bind_one_conn_to_session() 8496 * 8497 * The 4.1 client currently uses the same TCP connection for the 8498 * fore and backchannel. 8499 */ 8500 static 8501 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8502 struct rpc_xprt *xprt, 8503 struct nfs_client *clp, 8504 const struct cred *cred) 8505 { 8506 int status; 8507 struct nfs41_bind_conn_to_session_args args = { 8508 .client = clp, 8509 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8510 .retries = 0, 8511 }; 8512 struct nfs41_bind_conn_to_session_res res; 8513 struct rpc_message msg = { 8514 .rpc_proc = 8515 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8516 .rpc_argp = &args, 8517 .rpc_resp = &res, 8518 .rpc_cred = cred, 8519 }; 8520 struct rpc_task_setup task_setup_data = { 8521 .rpc_client = clnt, 8522 .rpc_xprt = xprt, 8523 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8524 .rpc_message = &msg, 8525 .flags = RPC_TASK_TIMEOUT, 8526 }; 8527 struct rpc_task *task; 8528 8529 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8530 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8531 args.dir = NFS4_CDFC4_FORE; 8532 8533 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8534 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8535 args.dir = NFS4_CDFC4_FORE; 8536 8537 task = rpc_run_task(&task_setup_data); 8538 if (!IS_ERR(task)) { 8539 status = task->tk_status; 8540 rpc_put_task(task); 8541 } else 8542 status = PTR_ERR(task); 8543 trace_nfs4_bind_conn_to_session(clp, status); 8544 if (status == 0) { 8545 if (memcmp(res.sessionid.data, 8546 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8547 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8548 return -EIO; 8549 } 8550 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8551 dprintk("NFS: %s: Unexpected direction from server\n", 8552 __func__); 8553 return -EIO; 8554 } 8555 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8556 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8557 __func__); 8558 return -EIO; 8559 } 8560 } 8561 8562 return status; 8563 } 8564 8565 struct rpc_bind_conn_calldata { 8566 struct nfs_client *clp; 8567 const struct cred *cred; 8568 }; 8569 8570 static int 8571 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8572 struct rpc_xprt *xprt, 8573 void *calldata) 8574 { 8575 struct rpc_bind_conn_calldata *p = calldata; 8576 8577 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8578 } 8579 8580 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8581 { 8582 struct rpc_bind_conn_calldata data = { 8583 .clp = clp, 8584 .cred = cred, 8585 }; 8586 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8587 nfs4_proc_bind_conn_to_session_callback, &data); 8588 } 8589 8590 /* 8591 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8592 * and operations we'd like to see to enable certain features in the allow map 8593 */ 8594 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8595 .how = SP4_MACH_CRED, 8596 .enforce.u.words = { 8597 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8598 1 << (OP_EXCHANGE_ID - 32) | 8599 1 << (OP_CREATE_SESSION - 32) | 8600 1 << (OP_DESTROY_SESSION - 32) | 8601 1 << (OP_DESTROY_CLIENTID - 32) 8602 }, 8603 .allow.u.words = { 8604 [0] = 1 << (OP_CLOSE) | 8605 1 << (OP_OPEN_DOWNGRADE) | 8606 1 << (OP_LOCKU) | 8607 1 << (OP_DELEGRETURN) | 8608 1 << (OP_COMMIT), 8609 [1] = 1 << (OP_SECINFO - 32) | 8610 1 << (OP_SECINFO_NO_NAME - 32) | 8611 1 << (OP_LAYOUTRETURN - 32) | 8612 1 << (OP_TEST_STATEID - 32) | 8613 1 << (OP_FREE_STATEID - 32) | 8614 1 << (OP_WRITE - 32) 8615 } 8616 }; 8617 8618 /* 8619 * Select the state protection mode for client `clp' given the server results 8620 * from exchange_id in `sp'. 8621 * 8622 * Returns 0 on success, negative errno otherwise. 8623 */ 8624 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8625 struct nfs41_state_protection *sp) 8626 { 8627 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8628 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8629 1 << (OP_EXCHANGE_ID - 32) | 8630 1 << (OP_CREATE_SESSION - 32) | 8631 1 << (OP_DESTROY_SESSION - 32) | 8632 1 << (OP_DESTROY_CLIENTID - 32) 8633 }; 8634 unsigned long flags = 0; 8635 unsigned int i; 8636 int ret = 0; 8637 8638 if (sp->how == SP4_MACH_CRED) { 8639 /* Print state protect result */ 8640 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8641 for (i = 0; i <= LAST_NFS4_OP; i++) { 8642 if (test_bit(i, sp->enforce.u.longs)) 8643 dfprintk(MOUNT, " enforce op %d\n", i); 8644 if (test_bit(i, sp->allow.u.longs)) 8645 dfprintk(MOUNT, " allow op %d\n", i); 8646 } 8647 8648 /* make sure nothing is on enforce list that isn't supported */ 8649 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8650 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8651 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8652 ret = -EINVAL; 8653 goto out; 8654 } 8655 } 8656 8657 /* 8658 * Minimal mode - state operations are allowed to use machine 8659 * credential. Note this already happens by default, so the 8660 * client doesn't have to do anything more than the negotiation. 8661 * 8662 * NOTE: we don't care if EXCHANGE_ID is in the list - 8663 * we're already using the machine cred for exchange_id 8664 * and will never use a different cred. 8665 */ 8666 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8667 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8668 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8669 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8670 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8671 dfprintk(MOUNT, " minimal mode enabled\n"); 8672 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8673 } else { 8674 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8675 ret = -EINVAL; 8676 goto out; 8677 } 8678 8679 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8680 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8681 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8682 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8683 dfprintk(MOUNT, " cleanup mode enabled\n"); 8684 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8685 } 8686 8687 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8688 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8689 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8690 } 8691 8692 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8693 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8694 dfprintk(MOUNT, " secinfo mode enabled\n"); 8695 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8696 } 8697 8698 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8699 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8700 dfprintk(MOUNT, " stateid mode enabled\n"); 8701 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8702 } 8703 8704 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8705 dfprintk(MOUNT, " write mode enabled\n"); 8706 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8707 } 8708 8709 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8710 dfprintk(MOUNT, " commit mode enabled\n"); 8711 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8712 } 8713 } 8714 out: 8715 clp->cl_sp4_flags = flags; 8716 return ret; 8717 } 8718 8719 struct nfs41_exchange_id_data { 8720 struct nfs41_exchange_id_res res; 8721 struct nfs41_exchange_id_args args; 8722 }; 8723 8724 static void nfs4_exchange_id_release(void *data) 8725 { 8726 struct nfs41_exchange_id_data *cdata = 8727 (struct nfs41_exchange_id_data *)data; 8728 8729 nfs_put_client(cdata->args.client); 8730 kfree(cdata->res.impl_id); 8731 kfree(cdata->res.server_scope); 8732 kfree(cdata->res.server_owner); 8733 kfree(cdata); 8734 } 8735 8736 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8737 .rpc_release = nfs4_exchange_id_release, 8738 }; 8739 8740 /* 8741 * _nfs4_proc_exchange_id() 8742 * 8743 * Wrapper for EXCHANGE_ID operation. 8744 */ 8745 static struct rpc_task * 8746 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8747 u32 sp4_how, struct rpc_xprt *xprt) 8748 { 8749 struct rpc_message msg = { 8750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8751 .rpc_cred = cred, 8752 }; 8753 struct rpc_task_setup task_setup_data = { 8754 .rpc_client = clp->cl_rpcclient, 8755 .callback_ops = &nfs4_exchange_id_call_ops, 8756 .rpc_message = &msg, 8757 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8758 }; 8759 struct nfs41_exchange_id_data *calldata; 8760 int status; 8761 8762 if (!refcount_inc_not_zero(&clp->cl_count)) 8763 return ERR_PTR(-EIO); 8764 8765 status = -ENOMEM; 8766 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8767 if (!calldata) 8768 goto out; 8769 8770 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8771 8772 status = nfs4_init_uniform_client_string(clp); 8773 if (status) 8774 goto out_calldata; 8775 8776 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8777 GFP_NOFS); 8778 status = -ENOMEM; 8779 if (unlikely(calldata->res.server_owner == NULL)) 8780 goto out_calldata; 8781 8782 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8783 GFP_NOFS); 8784 if (unlikely(calldata->res.server_scope == NULL)) 8785 goto out_server_owner; 8786 8787 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8788 if (unlikely(calldata->res.impl_id == NULL)) 8789 goto out_server_scope; 8790 8791 switch (sp4_how) { 8792 case SP4_NONE: 8793 calldata->args.state_protect.how = SP4_NONE; 8794 break; 8795 8796 case SP4_MACH_CRED: 8797 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8798 break; 8799 8800 default: 8801 /* unsupported! */ 8802 WARN_ON_ONCE(1); 8803 status = -EINVAL; 8804 goto out_impl_id; 8805 } 8806 if (xprt) { 8807 task_setup_data.rpc_xprt = xprt; 8808 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8809 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8810 sizeof(calldata->args.verifier.data)); 8811 } 8812 calldata->args.client = clp; 8813 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8814 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8815 #ifdef CONFIG_NFS_V4_1_MIGRATION 8816 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8817 #endif 8818 if (test_bit(NFS_CS_DS, &clp->cl_flags)) 8819 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8820 msg.rpc_argp = &calldata->args; 8821 msg.rpc_resp = &calldata->res; 8822 task_setup_data.callback_data = calldata; 8823 8824 return rpc_run_task(&task_setup_data); 8825 8826 out_impl_id: 8827 kfree(calldata->res.impl_id); 8828 out_server_scope: 8829 kfree(calldata->res.server_scope); 8830 out_server_owner: 8831 kfree(calldata->res.server_owner); 8832 out_calldata: 8833 kfree(calldata); 8834 out: 8835 nfs_put_client(clp); 8836 return ERR_PTR(status); 8837 } 8838 8839 /* 8840 * _nfs4_proc_exchange_id() 8841 * 8842 * Wrapper for EXCHANGE_ID operation. 8843 */ 8844 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8845 u32 sp4_how) 8846 { 8847 struct rpc_task *task; 8848 struct nfs41_exchange_id_args *argp; 8849 struct nfs41_exchange_id_res *resp; 8850 unsigned long now = jiffies; 8851 int status; 8852 8853 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8854 if (IS_ERR(task)) 8855 return PTR_ERR(task); 8856 8857 argp = task->tk_msg.rpc_argp; 8858 resp = task->tk_msg.rpc_resp; 8859 status = task->tk_status; 8860 if (status != 0) 8861 goto out; 8862 8863 status = nfs4_check_cl_exchange_flags(resp->flags, 8864 clp->cl_mvops->minor_version); 8865 if (status != 0) 8866 goto out; 8867 8868 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8869 if (status != 0) 8870 goto out; 8871 8872 do_renew_lease(clp, now); 8873 8874 clp->cl_clientid = resp->clientid; 8875 clp->cl_exchange_flags = resp->flags; 8876 clp->cl_seqid = resp->seqid; 8877 /* Client ID is not confirmed */ 8878 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8879 clear_bit(NFS4_SESSION_ESTABLISHED, 8880 &clp->cl_session->session_state); 8881 8882 if (clp->cl_serverscope != NULL && 8883 !nfs41_same_server_scope(clp->cl_serverscope, 8884 resp->server_scope)) { 8885 dprintk("%s: server_scope mismatch detected\n", 8886 __func__); 8887 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8888 } 8889 8890 swap(clp->cl_serverowner, resp->server_owner); 8891 swap(clp->cl_serverscope, resp->server_scope); 8892 swap(clp->cl_implid, resp->impl_id); 8893 8894 /* Save the EXCHANGE_ID verifier session trunk tests */ 8895 memcpy(clp->cl_confirm.data, argp->verifier.data, 8896 sizeof(clp->cl_confirm.data)); 8897 out: 8898 trace_nfs4_exchange_id(clp, status); 8899 rpc_put_task(task); 8900 return status; 8901 } 8902 8903 /* 8904 * nfs4_proc_exchange_id() 8905 * 8906 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8907 * 8908 * Since the clientid has expired, all compounds using sessions 8909 * associated with the stale clientid will be returning 8910 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8911 * be in some phase of session reset. 8912 * 8913 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8914 */ 8915 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8916 { 8917 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8918 int status; 8919 8920 /* try SP4_MACH_CRED if krb5i/p */ 8921 if (authflavor == RPC_AUTH_GSS_KRB5I || 8922 authflavor == RPC_AUTH_GSS_KRB5P) { 8923 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8924 if (!status) 8925 return 0; 8926 } 8927 8928 /* try SP4_NONE */ 8929 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8930 } 8931 8932 /** 8933 * nfs4_test_session_trunk 8934 * 8935 * This is an add_xprt_test() test function called from 8936 * rpc_clnt_setup_test_and_add_xprt. 8937 * 8938 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8939 * and is dereferrenced in nfs4_exchange_id_release 8940 * 8941 * Upon success, add the new transport to the rpc_clnt 8942 * 8943 * @clnt: struct rpc_clnt to get new transport 8944 * @xprt: the rpc_xprt to test 8945 * @data: call data for _nfs4_proc_exchange_id. 8946 */ 8947 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8948 void *data) 8949 { 8950 struct nfs4_add_xprt_data *adata = data; 8951 struct rpc_task *task; 8952 int status; 8953 8954 u32 sp4_how; 8955 8956 dprintk("--> %s try %s\n", __func__, 8957 xprt->address_strings[RPC_DISPLAY_ADDR]); 8958 8959 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8960 8961 try_again: 8962 /* Test connection for session trunking. Async exchange_id call */ 8963 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8964 if (IS_ERR(task)) 8965 return; 8966 8967 status = task->tk_status; 8968 if (status == 0) 8969 status = nfs4_detect_session_trunking(adata->clp, 8970 task->tk_msg.rpc_resp, xprt); 8971 8972 if (status == 0) 8973 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8974 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt, 8975 (struct sockaddr *)&xprt->addr)) 8976 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8977 8978 rpc_put_task(task); 8979 if (status == -NFS4ERR_DELAY) { 8980 ssleep(1); 8981 goto try_again; 8982 } 8983 } 8984 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8985 8986 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8987 const struct cred *cred) 8988 { 8989 struct rpc_message msg = { 8990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8991 .rpc_argp = clp, 8992 .rpc_cred = cred, 8993 }; 8994 int status; 8995 8996 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8997 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8998 trace_nfs4_destroy_clientid(clp, status); 8999 if (status) 9000 dprintk("NFS: Got error %d from the server %s on " 9001 "DESTROY_CLIENTID.", status, clp->cl_hostname); 9002 return status; 9003 } 9004 9005 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 9006 const struct cred *cred) 9007 { 9008 unsigned int loop; 9009 int ret; 9010 9011 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 9012 ret = _nfs4_proc_destroy_clientid(clp, cred); 9013 switch (ret) { 9014 case -NFS4ERR_DELAY: 9015 case -NFS4ERR_CLIENTID_BUSY: 9016 ssleep(1); 9017 break; 9018 default: 9019 return ret; 9020 } 9021 } 9022 return 0; 9023 } 9024 9025 int nfs4_destroy_clientid(struct nfs_client *clp) 9026 { 9027 const struct cred *cred; 9028 int ret = 0; 9029 9030 if (clp->cl_mvops->minor_version < 1) 9031 goto out; 9032 if (clp->cl_exchange_flags == 0) 9033 goto out; 9034 if (clp->cl_preserve_clid) 9035 goto out; 9036 cred = nfs4_get_clid_cred(clp); 9037 ret = nfs4_proc_destroy_clientid(clp, cred); 9038 put_cred(cred); 9039 switch (ret) { 9040 case 0: 9041 case -NFS4ERR_STALE_CLIENTID: 9042 clp->cl_exchange_flags = 0; 9043 } 9044 out: 9045 return ret; 9046 } 9047 9048 #endif /* CONFIG_NFS_V4_1 */ 9049 9050 struct nfs4_get_lease_time_data { 9051 struct nfs4_get_lease_time_args *args; 9052 struct nfs4_get_lease_time_res *res; 9053 struct nfs_client *clp; 9054 }; 9055 9056 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9057 void *calldata) 9058 { 9059 struct nfs4_get_lease_time_data *data = 9060 (struct nfs4_get_lease_time_data *)calldata; 9061 9062 /* just setup sequence, do not trigger session recovery 9063 since we're invoked within one */ 9064 nfs4_setup_sequence(data->clp, 9065 &data->args->la_seq_args, 9066 &data->res->lr_seq_res, 9067 task); 9068 } 9069 9070 /* 9071 * Called from nfs4_state_manager thread for session setup, so don't recover 9072 * from sequence operation or clientid errors. 9073 */ 9074 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9075 { 9076 struct nfs4_get_lease_time_data *data = 9077 (struct nfs4_get_lease_time_data *)calldata; 9078 9079 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9080 return; 9081 switch (task->tk_status) { 9082 case -NFS4ERR_DELAY: 9083 case -NFS4ERR_GRACE: 9084 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9085 task->tk_status = 0; 9086 fallthrough; 9087 case -NFS4ERR_RETRY_UNCACHED_REP: 9088 rpc_restart_call_prepare(task); 9089 return; 9090 } 9091 } 9092 9093 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9094 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9095 .rpc_call_done = nfs4_get_lease_time_done, 9096 }; 9097 9098 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9099 { 9100 struct nfs4_get_lease_time_args args; 9101 struct nfs4_get_lease_time_res res = { 9102 .lr_fsinfo = fsinfo, 9103 }; 9104 struct nfs4_get_lease_time_data data = { 9105 .args = &args, 9106 .res = &res, 9107 .clp = clp, 9108 }; 9109 struct rpc_message msg = { 9110 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9111 .rpc_argp = &args, 9112 .rpc_resp = &res, 9113 }; 9114 struct rpc_task_setup task_setup = { 9115 .rpc_client = clp->cl_rpcclient, 9116 .rpc_message = &msg, 9117 .callback_ops = &nfs4_get_lease_time_ops, 9118 .callback_data = &data, 9119 .flags = RPC_TASK_TIMEOUT, 9120 }; 9121 9122 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9123 return nfs4_call_sync_custom(&task_setup); 9124 } 9125 9126 #ifdef CONFIG_NFS_V4_1 9127 9128 /* 9129 * Initialize the values to be used by the client in CREATE_SESSION 9130 * If nfs4_init_session set the fore channel request and response sizes, 9131 * use them. 9132 * 9133 * Set the back channel max_resp_sz_cached to zero to force the client to 9134 * always set csa_cachethis to FALSE because the current implementation 9135 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9136 */ 9137 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9138 struct rpc_clnt *clnt) 9139 { 9140 unsigned int max_rqst_sz, max_resp_sz; 9141 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9142 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9143 9144 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9145 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9146 9147 /* Fore channel attributes */ 9148 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9149 args->fc_attrs.max_resp_sz = max_resp_sz; 9150 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9151 args->fc_attrs.max_reqs = max_session_slots; 9152 9153 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9154 "max_ops=%u max_reqs=%u\n", 9155 __func__, 9156 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9157 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9158 9159 /* Back channel attributes */ 9160 args->bc_attrs.max_rqst_sz = max_bc_payload; 9161 args->bc_attrs.max_resp_sz = max_bc_payload; 9162 args->bc_attrs.max_resp_sz_cached = 0; 9163 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9164 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9165 if (args->bc_attrs.max_reqs > max_bc_slots) 9166 args->bc_attrs.max_reqs = max_bc_slots; 9167 9168 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9169 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9170 __func__, 9171 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9172 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9173 args->bc_attrs.max_reqs); 9174 } 9175 9176 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9177 struct nfs41_create_session_res *res) 9178 { 9179 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9180 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9181 9182 if (rcvd->max_resp_sz > sent->max_resp_sz) 9183 return -EINVAL; 9184 /* 9185 * Our requested max_ops is the minimum we need; we're not 9186 * prepared to break up compounds into smaller pieces than that. 9187 * So, no point even trying to continue if the server won't 9188 * cooperate: 9189 */ 9190 if (rcvd->max_ops < sent->max_ops) 9191 return -EINVAL; 9192 if (rcvd->max_reqs == 0) 9193 return -EINVAL; 9194 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9195 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9196 return 0; 9197 } 9198 9199 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9200 struct nfs41_create_session_res *res) 9201 { 9202 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9203 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9204 9205 if (!(res->flags & SESSION4_BACK_CHAN)) 9206 goto out; 9207 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9208 return -EINVAL; 9209 if (rcvd->max_resp_sz < sent->max_resp_sz) 9210 return -EINVAL; 9211 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9212 return -EINVAL; 9213 if (rcvd->max_ops > sent->max_ops) 9214 return -EINVAL; 9215 if (rcvd->max_reqs > sent->max_reqs) 9216 return -EINVAL; 9217 out: 9218 return 0; 9219 } 9220 9221 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9222 struct nfs41_create_session_res *res) 9223 { 9224 int ret; 9225 9226 ret = nfs4_verify_fore_channel_attrs(args, res); 9227 if (ret) 9228 return ret; 9229 return nfs4_verify_back_channel_attrs(args, res); 9230 } 9231 9232 static void nfs4_update_session(struct nfs4_session *session, 9233 struct nfs41_create_session_res *res) 9234 { 9235 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9236 /* Mark client id and session as being confirmed */ 9237 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9238 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9239 session->flags = res->flags; 9240 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9241 if (res->flags & SESSION4_BACK_CHAN) 9242 memcpy(&session->bc_attrs, &res->bc_attrs, 9243 sizeof(session->bc_attrs)); 9244 } 9245 9246 static int _nfs4_proc_create_session(struct nfs_client *clp, 9247 const struct cred *cred) 9248 { 9249 struct nfs4_session *session = clp->cl_session; 9250 struct nfs41_create_session_args args = { 9251 .client = clp, 9252 .clientid = clp->cl_clientid, 9253 .seqid = clp->cl_seqid, 9254 .cb_program = NFS4_CALLBACK, 9255 }; 9256 struct nfs41_create_session_res res; 9257 9258 struct rpc_message msg = { 9259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9260 .rpc_argp = &args, 9261 .rpc_resp = &res, 9262 .rpc_cred = cred, 9263 }; 9264 int status; 9265 9266 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9267 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9268 9269 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9270 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9271 trace_nfs4_create_session(clp, status); 9272 9273 switch (status) { 9274 case -NFS4ERR_STALE_CLIENTID: 9275 case -NFS4ERR_DELAY: 9276 case -ETIMEDOUT: 9277 case -EACCES: 9278 case -EAGAIN: 9279 goto out; 9280 } 9281 9282 clp->cl_seqid++; 9283 if (!status) { 9284 /* Verify the session's negotiated channel_attrs values */ 9285 status = nfs4_verify_channel_attrs(&args, &res); 9286 /* Increment the clientid slot sequence id */ 9287 if (status) 9288 goto out; 9289 nfs4_update_session(session, &res); 9290 } 9291 out: 9292 return status; 9293 } 9294 9295 /* 9296 * Issues a CREATE_SESSION operation to the server. 9297 * It is the responsibility of the caller to verify the session is 9298 * expired before calling this routine. 9299 */ 9300 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9301 { 9302 int status; 9303 unsigned *ptr; 9304 struct nfs4_session *session = clp->cl_session; 9305 struct nfs4_add_xprt_data xprtdata = { 9306 .clp = clp, 9307 }; 9308 struct rpc_add_xprt_test rpcdata = { 9309 .add_xprt_test = clp->cl_mvops->session_trunk, 9310 .data = &xprtdata, 9311 }; 9312 9313 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9314 9315 status = _nfs4_proc_create_session(clp, cred); 9316 if (status) 9317 goto out; 9318 9319 /* Init or reset the session slot tables */ 9320 status = nfs4_setup_session_slot_tables(session); 9321 dprintk("slot table setup returned %d\n", status); 9322 if (status) 9323 goto out; 9324 9325 ptr = (unsigned *)&session->sess_id.data[0]; 9326 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9327 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9328 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9329 out: 9330 return status; 9331 } 9332 9333 /* 9334 * Issue the over-the-wire RPC DESTROY_SESSION. 9335 * The caller must serialize access to this routine. 9336 */ 9337 int nfs4_proc_destroy_session(struct nfs4_session *session, 9338 const struct cred *cred) 9339 { 9340 struct rpc_message msg = { 9341 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9342 .rpc_argp = session, 9343 .rpc_cred = cred, 9344 }; 9345 int status = 0; 9346 9347 /* session is still being setup */ 9348 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9349 return 0; 9350 9351 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9352 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9353 trace_nfs4_destroy_session(session->clp, status); 9354 9355 if (status) 9356 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9357 "Session has been destroyed regardless...\n", status); 9358 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9359 return status; 9360 } 9361 9362 /* 9363 * Renew the cl_session lease. 9364 */ 9365 struct nfs4_sequence_data { 9366 struct nfs_client *clp; 9367 struct nfs4_sequence_args args; 9368 struct nfs4_sequence_res res; 9369 }; 9370 9371 static void nfs41_sequence_release(void *data) 9372 { 9373 struct nfs4_sequence_data *calldata = data; 9374 struct nfs_client *clp = calldata->clp; 9375 9376 if (refcount_read(&clp->cl_count) > 1) 9377 nfs4_schedule_state_renewal(clp); 9378 nfs_put_client(clp); 9379 kfree(calldata); 9380 } 9381 9382 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9383 { 9384 switch(task->tk_status) { 9385 case -NFS4ERR_DELAY: 9386 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9387 return -EAGAIN; 9388 default: 9389 nfs4_schedule_lease_recovery(clp); 9390 } 9391 return 0; 9392 } 9393 9394 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9395 { 9396 struct nfs4_sequence_data *calldata = data; 9397 struct nfs_client *clp = calldata->clp; 9398 9399 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9400 return; 9401 9402 trace_nfs4_sequence(clp, task->tk_status); 9403 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9404 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9405 if (refcount_read(&clp->cl_count) == 1) 9406 return; 9407 9408 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9409 rpc_restart_call_prepare(task); 9410 return; 9411 } 9412 } 9413 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9414 } 9415 9416 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9417 { 9418 struct nfs4_sequence_data *calldata = data; 9419 struct nfs_client *clp = calldata->clp; 9420 struct nfs4_sequence_args *args; 9421 struct nfs4_sequence_res *res; 9422 9423 args = task->tk_msg.rpc_argp; 9424 res = task->tk_msg.rpc_resp; 9425 9426 nfs4_setup_sequence(clp, args, res, task); 9427 } 9428 9429 static const struct rpc_call_ops nfs41_sequence_ops = { 9430 .rpc_call_done = nfs41_sequence_call_done, 9431 .rpc_call_prepare = nfs41_sequence_prepare, 9432 .rpc_release = nfs41_sequence_release, 9433 }; 9434 9435 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9436 const struct cred *cred, 9437 struct nfs4_slot *slot, 9438 bool is_privileged) 9439 { 9440 struct nfs4_sequence_data *calldata; 9441 struct rpc_message msg = { 9442 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9443 .rpc_cred = cred, 9444 }; 9445 struct rpc_task_setup task_setup_data = { 9446 .rpc_client = clp->cl_rpcclient, 9447 .rpc_message = &msg, 9448 .callback_ops = &nfs41_sequence_ops, 9449 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9450 }; 9451 struct rpc_task *ret; 9452 9453 ret = ERR_PTR(-EIO); 9454 if (!refcount_inc_not_zero(&clp->cl_count)) 9455 goto out_err; 9456 9457 ret = ERR_PTR(-ENOMEM); 9458 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9459 if (calldata == NULL) 9460 goto out_put_clp; 9461 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9462 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9463 msg.rpc_argp = &calldata->args; 9464 msg.rpc_resp = &calldata->res; 9465 calldata->clp = clp; 9466 task_setup_data.callback_data = calldata; 9467 9468 ret = rpc_run_task(&task_setup_data); 9469 if (IS_ERR(ret)) 9470 goto out_err; 9471 return ret; 9472 out_put_clp: 9473 nfs_put_client(clp); 9474 out_err: 9475 nfs41_release_slot(slot); 9476 return ret; 9477 } 9478 9479 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9480 { 9481 struct rpc_task *task; 9482 int ret = 0; 9483 9484 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9485 return -EAGAIN; 9486 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9487 if (IS_ERR(task)) 9488 ret = PTR_ERR(task); 9489 else 9490 rpc_put_task_async(task); 9491 dprintk("<-- %s status=%d\n", __func__, ret); 9492 return ret; 9493 } 9494 9495 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9496 { 9497 struct rpc_task *task; 9498 int ret; 9499 9500 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9501 if (IS_ERR(task)) { 9502 ret = PTR_ERR(task); 9503 goto out; 9504 } 9505 ret = rpc_wait_for_completion_task(task); 9506 if (!ret) 9507 ret = task->tk_status; 9508 rpc_put_task(task); 9509 out: 9510 dprintk("<-- %s status=%d\n", __func__, ret); 9511 return ret; 9512 } 9513 9514 struct nfs4_reclaim_complete_data { 9515 struct nfs_client *clp; 9516 struct nfs41_reclaim_complete_args arg; 9517 struct nfs41_reclaim_complete_res res; 9518 }; 9519 9520 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9521 { 9522 struct nfs4_reclaim_complete_data *calldata = data; 9523 9524 nfs4_setup_sequence(calldata->clp, 9525 &calldata->arg.seq_args, 9526 &calldata->res.seq_res, 9527 task); 9528 } 9529 9530 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9531 { 9532 switch(task->tk_status) { 9533 case 0: 9534 wake_up_all(&clp->cl_lock_waitq); 9535 fallthrough; 9536 case -NFS4ERR_COMPLETE_ALREADY: 9537 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9538 break; 9539 case -NFS4ERR_DELAY: 9540 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9541 fallthrough; 9542 case -NFS4ERR_RETRY_UNCACHED_REP: 9543 case -EACCES: 9544 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9545 __func__, task->tk_status, clp->cl_hostname); 9546 return -EAGAIN; 9547 case -NFS4ERR_BADSESSION: 9548 case -NFS4ERR_DEADSESSION: 9549 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9550 break; 9551 default: 9552 nfs4_schedule_lease_recovery(clp); 9553 } 9554 return 0; 9555 } 9556 9557 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9558 { 9559 struct nfs4_reclaim_complete_data *calldata = data; 9560 struct nfs_client *clp = calldata->clp; 9561 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9562 9563 if (!nfs41_sequence_done(task, res)) 9564 return; 9565 9566 trace_nfs4_reclaim_complete(clp, task->tk_status); 9567 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9568 rpc_restart_call_prepare(task); 9569 return; 9570 } 9571 } 9572 9573 static void nfs4_free_reclaim_complete_data(void *data) 9574 { 9575 struct nfs4_reclaim_complete_data *calldata = data; 9576 9577 kfree(calldata); 9578 } 9579 9580 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9581 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9582 .rpc_call_done = nfs4_reclaim_complete_done, 9583 .rpc_release = nfs4_free_reclaim_complete_data, 9584 }; 9585 9586 /* 9587 * Issue a global reclaim complete. 9588 */ 9589 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9590 const struct cred *cred) 9591 { 9592 struct nfs4_reclaim_complete_data *calldata; 9593 struct rpc_message msg = { 9594 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9595 .rpc_cred = cred, 9596 }; 9597 struct rpc_task_setup task_setup_data = { 9598 .rpc_client = clp->cl_rpcclient, 9599 .rpc_message = &msg, 9600 .callback_ops = &nfs4_reclaim_complete_call_ops, 9601 .flags = RPC_TASK_NO_ROUND_ROBIN, 9602 }; 9603 int status = -ENOMEM; 9604 9605 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9606 if (calldata == NULL) 9607 goto out; 9608 calldata->clp = clp; 9609 calldata->arg.one_fs = 0; 9610 9611 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9612 msg.rpc_argp = &calldata->arg; 9613 msg.rpc_resp = &calldata->res; 9614 task_setup_data.callback_data = calldata; 9615 status = nfs4_call_sync_custom(&task_setup_data); 9616 out: 9617 dprintk("<-- %s status=%d\n", __func__, status); 9618 return status; 9619 } 9620 9621 static void 9622 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9623 { 9624 struct nfs4_layoutget *lgp = calldata; 9625 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9626 9627 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9628 &lgp->res.seq_res, task); 9629 } 9630 9631 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9632 { 9633 struct nfs4_layoutget *lgp = calldata; 9634 9635 nfs41_sequence_process(task, &lgp->res.seq_res); 9636 } 9637 9638 static int 9639 nfs4_layoutget_handle_exception(struct rpc_task *task, 9640 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9641 { 9642 struct inode *inode = lgp->args.inode; 9643 struct nfs_server *server = NFS_SERVER(inode); 9644 struct pnfs_layout_hdr *lo = lgp->lo; 9645 int nfs4err = task->tk_status; 9646 int err, status = 0; 9647 LIST_HEAD(head); 9648 9649 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9650 9651 nfs4_sequence_free_slot(&lgp->res.seq_res); 9652 9653 switch (nfs4err) { 9654 case 0: 9655 goto out; 9656 9657 /* 9658 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9659 * on the file. set tk_status to -ENODATA to tell upper layer to 9660 * retry go inband. 9661 */ 9662 case -NFS4ERR_LAYOUTUNAVAILABLE: 9663 status = -ENODATA; 9664 goto out; 9665 /* 9666 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9667 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9668 */ 9669 case -NFS4ERR_BADLAYOUT: 9670 status = -EOVERFLOW; 9671 goto out; 9672 /* 9673 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9674 * (or clients) writing to the same RAID stripe except when 9675 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9676 * 9677 * Treat it like we would RECALLCONFLICT -- we retry for a little 9678 * while, and then eventually give up. 9679 */ 9680 case -NFS4ERR_LAYOUTTRYLATER: 9681 if (lgp->args.minlength == 0) { 9682 status = -EOVERFLOW; 9683 goto out; 9684 } 9685 status = -EBUSY; 9686 break; 9687 case -NFS4ERR_RECALLCONFLICT: 9688 case -NFS4ERR_RETURNCONFLICT: 9689 status = -ERECALLCONFLICT; 9690 break; 9691 case -NFS4ERR_DELEG_REVOKED: 9692 case -NFS4ERR_ADMIN_REVOKED: 9693 case -NFS4ERR_EXPIRED: 9694 case -NFS4ERR_BAD_STATEID: 9695 exception->timeout = 0; 9696 spin_lock(&inode->i_lock); 9697 /* If the open stateid was bad, then recover it. */ 9698 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9699 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9700 spin_unlock(&inode->i_lock); 9701 exception->state = lgp->args.ctx->state; 9702 exception->stateid = &lgp->args.stateid; 9703 break; 9704 } 9705 9706 /* 9707 * Mark the bad layout state as invalid, then retry 9708 */ 9709 pnfs_mark_layout_stateid_invalid(lo, &head); 9710 spin_unlock(&inode->i_lock); 9711 nfs_commit_inode(inode, 0); 9712 pnfs_free_lseg_list(&head); 9713 status = -EAGAIN; 9714 goto out; 9715 } 9716 9717 err = nfs4_handle_exception(server, nfs4err, exception); 9718 if (!status) { 9719 if (exception->retry) 9720 status = -EAGAIN; 9721 else 9722 status = err; 9723 } 9724 out: 9725 return status; 9726 } 9727 9728 size_t max_response_pages(struct nfs_server *server) 9729 { 9730 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9731 return nfs_page_array_len(0, max_resp_sz); 9732 } 9733 9734 static void nfs4_layoutget_release(void *calldata) 9735 { 9736 struct nfs4_layoutget *lgp = calldata; 9737 9738 nfs4_sequence_free_slot(&lgp->res.seq_res); 9739 pnfs_layoutget_free(lgp); 9740 } 9741 9742 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9743 .rpc_call_prepare = nfs4_layoutget_prepare, 9744 .rpc_call_done = nfs4_layoutget_done, 9745 .rpc_release = nfs4_layoutget_release, 9746 }; 9747 9748 struct pnfs_layout_segment * 9749 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9750 { 9751 struct inode *inode = lgp->args.inode; 9752 struct nfs_server *server = NFS_SERVER(inode); 9753 struct rpc_task *task; 9754 struct rpc_message msg = { 9755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9756 .rpc_argp = &lgp->args, 9757 .rpc_resp = &lgp->res, 9758 .rpc_cred = lgp->cred, 9759 }; 9760 struct rpc_task_setup task_setup_data = { 9761 .rpc_client = server->client, 9762 .rpc_message = &msg, 9763 .callback_ops = &nfs4_layoutget_call_ops, 9764 .callback_data = lgp, 9765 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9766 RPC_TASK_MOVEABLE, 9767 }; 9768 struct pnfs_layout_segment *lseg = NULL; 9769 struct nfs4_exception exception = { 9770 .inode = inode, 9771 .timeout = *timeout, 9772 }; 9773 int status = 0; 9774 9775 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9776 9777 task = rpc_run_task(&task_setup_data); 9778 if (IS_ERR(task)) 9779 return ERR_CAST(task); 9780 9781 status = rpc_wait_for_completion_task(task); 9782 if (status != 0) 9783 goto out; 9784 9785 if (task->tk_status < 0) { 9786 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9787 *timeout = exception.timeout; 9788 } else if (lgp->res.layoutp->len == 0) { 9789 status = -EAGAIN; 9790 *timeout = nfs4_update_delay(&exception.timeout); 9791 } else 9792 lseg = pnfs_layout_process(lgp); 9793 out: 9794 trace_nfs4_layoutget(lgp->args.ctx, 9795 &lgp->args.range, 9796 &lgp->res.range, 9797 &lgp->res.stateid, 9798 status); 9799 9800 rpc_put_task(task); 9801 dprintk("<-- %s status=%d\n", __func__, status); 9802 if (status) 9803 return ERR_PTR(status); 9804 return lseg; 9805 } 9806 9807 static void 9808 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9809 { 9810 struct nfs4_layoutreturn *lrp = calldata; 9811 9812 nfs4_setup_sequence(lrp->clp, 9813 &lrp->args.seq_args, 9814 &lrp->res.seq_res, 9815 task); 9816 if (!pnfs_layout_is_valid(lrp->args.layout)) 9817 rpc_exit(task, 0); 9818 } 9819 9820 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9821 { 9822 struct nfs4_layoutreturn *lrp = calldata; 9823 struct nfs_server *server; 9824 9825 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9826 return; 9827 9828 /* 9829 * Was there an RPC level error? Assume the call succeeded, 9830 * and that we need to release the layout 9831 */ 9832 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9833 lrp->res.lrs_present = 0; 9834 return; 9835 } 9836 9837 server = NFS_SERVER(lrp->args.inode); 9838 switch (task->tk_status) { 9839 case -NFS4ERR_OLD_STATEID: 9840 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9841 &lrp->args.range, 9842 lrp->args.inode)) 9843 goto out_restart; 9844 fallthrough; 9845 default: 9846 task->tk_status = 0; 9847 fallthrough; 9848 case 0: 9849 break; 9850 case -NFS4ERR_DELAY: 9851 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9852 break; 9853 goto out_restart; 9854 } 9855 return; 9856 out_restart: 9857 task->tk_status = 0; 9858 nfs4_sequence_free_slot(&lrp->res.seq_res); 9859 rpc_restart_call_prepare(task); 9860 } 9861 9862 static void nfs4_layoutreturn_release(void *calldata) 9863 { 9864 struct nfs4_layoutreturn *lrp = calldata; 9865 struct pnfs_layout_hdr *lo = lrp->args.layout; 9866 9867 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9868 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9869 nfs4_sequence_free_slot(&lrp->res.seq_res); 9870 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9871 lrp->ld_private.ops->free(&lrp->ld_private); 9872 pnfs_put_layout_hdr(lrp->args.layout); 9873 nfs_iput_and_deactive(lrp->inode); 9874 put_cred(lrp->cred); 9875 kfree(calldata); 9876 } 9877 9878 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9879 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9880 .rpc_call_done = nfs4_layoutreturn_done, 9881 .rpc_release = nfs4_layoutreturn_release, 9882 }; 9883 9884 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9885 { 9886 struct rpc_task *task; 9887 struct rpc_message msg = { 9888 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9889 .rpc_argp = &lrp->args, 9890 .rpc_resp = &lrp->res, 9891 .rpc_cred = lrp->cred, 9892 }; 9893 struct rpc_task_setup task_setup_data = { 9894 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9895 .rpc_message = &msg, 9896 .callback_ops = &nfs4_layoutreturn_call_ops, 9897 .callback_data = lrp, 9898 .flags = RPC_TASK_MOVEABLE, 9899 }; 9900 int status = 0; 9901 9902 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9903 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9904 &task_setup_data.rpc_client, &msg); 9905 9906 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9907 if (!sync) { 9908 if (!lrp->inode) { 9909 nfs4_layoutreturn_release(lrp); 9910 return -EAGAIN; 9911 } 9912 task_setup_data.flags |= RPC_TASK_ASYNC; 9913 } 9914 if (!lrp->inode) 9915 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9916 1); 9917 else 9918 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9919 0); 9920 task = rpc_run_task(&task_setup_data); 9921 if (IS_ERR(task)) 9922 return PTR_ERR(task); 9923 if (sync) 9924 status = task->tk_status; 9925 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9926 dprintk("<-- %s status=%d\n", __func__, status); 9927 rpc_put_task(task); 9928 return status; 9929 } 9930 9931 static int 9932 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9933 struct pnfs_device *pdev, 9934 const struct cred *cred) 9935 { 9936 struct nfs4_getdeviceinfo_args args = { 9937 .pdev = pdev, 9938 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9939 NOTIFY_DEVICEID4_DELETE, 9940 }; 9941 struct nfs4_getdeviceinfo_res res = { 9942 .pdev = pdev, 9943 }; 9944 struct rpc_message msg = { 9945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9946 .rpc_argp = &args, 9947 .rpc_resp = &res, 9948 .rpc_cred = cred, 9949 }; 9950 int status; 9951 9952 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9953 if (res.notification & ~args.notify_types) 9954 dprintk("%s: unsupported notification\n", __func__); 9955 if (res.notification != args.notify_types) 9956 pdev->nocache = 1; 9957 9958 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9959 9960 dprintk("<-- %s status=%d\n", __func__, status); 9961 9962 return status; 9963 } 9964 9965 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9966 struct pnfs_device *pdev, 9967 const struct cred *cred) 9968 { 9969 struct nfs4_exception exception = { }; 9970 int err; 9971 9972 do { 9973 err = nfs4_handle_exception(server, 9974 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9975 &exception); 9976 } while (exception.retry); 9977 return err; 9978 } 9979 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9980 9981 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9982 { 9983 struct nfs4_layoutcommit_data *data = calldata; 9984 struct nfs_server *server = NFS_SERVER(data->args.inode); 9985 9986 nfs4_setup_sequence(server->nfs_client, 9987 &data->args.seq_args, 9988 &data->res.seq_res, 9989 task); 9990 } 9991 9992 static void 9993 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9994 { 9995 struct nfs4_layoutcommit_data *data = calldata; 9996 struct nfs_server *server = NFS_SERVER(data->args.inode); 9997 9998 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9999 return; 10000 10001 switch (task->tk_status) { /* Just ignore these failures */ 10002 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 10003 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 10004 case -NFS4ERR_BADLAYOUT: /* no layout */ 10005 case -NFS4ERR_GRACE: /* loca_recalim always false */ 10006 task->tk_status = 0; 10007 break; 10008 case 0: 10009 break; 10010 default: 10011 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 10012 rpc_restart_call_prepare(task); 10013 return; 10014 } 10015 } 10016 } 10017 10018 static void nfs4_layoutcommit_release(void *calldata) 10019 { 10020 struct nfs4_layoutcommit_data *data = calldata; 10021 10022 pnfs_cleanup_layoutcommit(data); 10023 nfs_post_op_update_inode_force_wcc(data->args.inode, 10024 data->res.fattr); 10025 put_cred(data->cred); 10026 nfs_iput_and_deactive(data->inode); 10027 kfree(data); 10028 } 10029 10030 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10031 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10032 .rpc_call_done = nfs4_layoutcommit_done, 10033 .rpc_release = nfs4_layoutcommit_release, 10034 }; 10035 10036 int 10037 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10038 { 10039 struct rpc_message msg = { 10040 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10041 .rpc_argp = &data->args, 10042 .rpc_resp = &data->res, 10043 .rpc_cred = data->cred, 10044 }; 10045 struct rpc_task_setup task_setup_data = { 10046 .task = &data->task, 10047 .rpc_client = NFS_CLIENT(data->args.inode), 10048 .rpc_message = &msg, 10049 .callback_ops = &nfs4_layoutcommit_ops, 10050 .callback_data = data, 10051 .flags = RPC_TASK_MOVEABLE, 10052 }; 10053 struct rpc_task *task; 10054 int status = 0; 10055 10056 dprintk("NFS: initiating layoutcommit call. sync %d " 10057 "lbw: %llu inode %lu\n", sync, 10058 data->args.lastbytewritten, 10059 data->args.inode->i_ino); 10060 10061 if (!sync) { 10062 data->inode = nfs_igrab_and_active(data->args.inode); 10063 if (data->inode == NULL) { 10064 nfs4_layoutcommit_release(data); 10065 return -EAGAIN; 10066 } 10067 task_setup_data.flags = RPC_TASK_ASYNC; 10068 } 10069 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10070 task = rpc_run_task(&task_setup_data); 10071 if (IS_ERR(task)) 10072 return PTR_ERR(task); 10073 if (sync) 10074 status = task->tk_status; 10075 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10076 dprintk("%s: status %d\n", __func__, status); 10077 rpc_put_task(task); 10078 return status; 10079 } 10080 10081 /* 10082 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10083 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10084 */ 10085 static int 10086 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10087 struct nfs_fsinfo *info, 10088 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10089 { 10090 struct nfs41_secinfo_no_name_args args = { 10091 .style = SECINFO_STYLE_CURRENT_FH, 10092 }; 10093 struct nfs4_secinfo_res res = { 10094 .flavors = flavors, 10095 }; 10096 struct rpc_message msg = { 10097 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10098 .rpc_argp = &args, 10099 .rpc_resp = &res, 10100 }; 10101 struct nfs4_call_sync_data data = { 10102 .seq_server = server, 10103 .seq_args = &args.seq_args, 10104 .seq_res = &res.seq_res, 10105 }; 10106 struct rpc_task_setup task_setup = { 10107 .rpc_client = server->client, 10108 .rpc_message = &msg, 10109 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10110 .callback_data = &data, 10111 .flags = RPC_TASK_NO_ROUND_ROBIN, 10112 }; 10113 const struct cred *cred = NULL; 10114 int status; 10115 10116 if (use_integrity) { 10117 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10118 10119 cred = nfs4_get_clid_cred(server->nfs_client); 10120 msg.rpc_cred = cred; 10121 } 10122 10123 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10124 status = nfs4_call_sync_custom(&task_setup); 10125 dprintk("<-- %s status=%d\n", __func__, status); 10126 10127 put_cred(cred); 10128 10129 return status; 10130 } 10131 10132 static int 10133 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10134 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10135 { 10136 struct nfs4_exception exception = { 10137 .interruptible = true, 10138 }; 10139 int err; 10140 do { 10141 /* first try using integrity protection */ 10142 err = -NFS4ERR_WRONGSEC; 10143 10144 /* try to use integrity protection with machine cred */ 10145 if (_nfs4_is_integrity_protected(server->nfs_client)) 10146 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10147 flavors, true); 10148 10149 /* 10150 * if unable to use integrity protection, or SECINFO with 10151 * integrity protection returns NFS4ERR_WRONGSEC (which is 10152 * disallowed by spec, but exists in deployed servers) use 10153 * the current filesystem's rpc_client and the user cred. 10154 */ 10155 if (err == -NFS4ERR_WRONGSEC) 10156 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10157 flavors, false); 10158 10159 switch (err) { 10160 case 0: 10161 case -NFS4ERR_WRONGSEC: 10162 case -ENOTSUPP: 10163 goto out; 10164 default: 10165 err = nfs4_handle_exception(server, err, &exception); 10166 } 10167 } while (exception.retry); 10168 out: 10169 return err; 10170 } 10171 10172 static int 10173 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10174 struct nfs_fsinfo *info) 10175 { 10176 int err; 10177 struct page *page; 10178 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10179 struct nfs4_secinfo_flavors *flavors; 10180 struct nfs4_secinfo4 *secinfo; 10181 int i; 10182 10183 page = alloc_page(GFP_KERNEL); 10184 if (!page) { 10185 err = -ENOMEM; 10186 goto out; 10187 } 10188 10189 flavors = page_address(page); 10190 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10191 10192 /* 10193 * Fall back on "guess and check" method if 10194 * the server doesn't support SECINFO_NO_NAME 10195 */ 10196 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10197 err = nfs4_find_root_sec(server, fhandle, info); 10198 goto out_freepage; 10199 } 10200 if (err) 10201 goto out_freepage; 10202 10203 for (i = 0; i < flavors->num_flavors; i++) { 10204 secinfo = &flavors->flavors[i]; 10205 10206 switch (secinfo->flavor) { 10207 case RPC_AUTH_NULL: 10208 case RPC_AUTH_UNIX: 10209 case RPC_AUTH_GSS: 10210 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10211 &secinfo->flavor_info); 10212 break; 10213 default: 10214 flavor = RPC_AUTH_MAXFLAVOR; 10215 break; 10216 } 10217 10218 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10219 flavor = RPC_AUTH_MAXFLAVOR; 10220 10221 if (flavor != RPC_AUTH_MAXFLAVOR) { 10222 err = nfs4_lookup_root_sec(server, fhandle, 10223 info, flavor); 10224 if (!err) 10225 break; 10226 } 10227 } 10228 10229 if (flavor == RPC_AUTH_MAXFLAVOR) 10230 err = -EPERM; 10231 10232 out_freepage: 10233 put_page(page); 10234 if (err == -EACCES) 10235 return -EPERM; 10236 out: 10237 return err; 10238 } 10239 10240 static int _nfs41_test_stateid(struct nfs_server *server, 10241 nfs4_stateid *stateid, 10242 const struct cred *cred) 10243 { 10244 int status; 10245 struct nfs41_test_stateid_args args = { 10246 .stateid = stateid, 10247 }; 10248 struct nfs41_test_stateid_res res; 10249 struct rpc_message msg = { 10250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10251 .rpc_argp = &args, 10252 .rpc_resp = &res, 10253 .rpc_cred = cred, 10254 }; 10255 struct rpc_clnt *rpc_client = server->client; 10256 10257 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10258 &rpc_client, &msg); 10259 10260 dprintk("NFS call test_stateid %p\n", stateid); 10261 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10262 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10263 &args.seq_args, &res.seq_res); 10264 if (status != NFS_OK) { 10265 dprintk("NFS reply test_stateid: failed, %d\n", status); 10266 return status; 10267 } 10268 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10269 return -res.status; 10270 } 10271 10272 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10273 int err, struct nfs4_exception *exception) 10274 { 10275 exception->retry = 0; 10276 switch(err) { 10277 case -NFS4ERR_DELAY: 10278 case -NFS4ERR_RETRY_UNCACHED_REP: 10279 nfs4_handle_exception(server, err, exception); 10280 break; 10281 case -NFS4ERR_BADSESSION: 10282 case -NFS4ERR_BADSLOT: 10283 case -NFS4ERR_BAD_HIGH_SLOT: 10284 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10285 case -NFS4ERR_DEADSESSION: 10286 nfs4_do_handle_exception(server, err, exception); 10287 } 10288 } 10289 10290 /** 10291 * nfs41_test_stateid - perform a TEST_STATEID operation 10292 * 10293 * @server: server / transport on which to perform the operation 10294 * @stateid: state ID to test 10295 * @cred: credential 10296 * 10297 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10298 * Otherwise a negative NFS4ERR value is returned if the operation 10299 * failed or the state ID is not currently valid. 10300 */ 10301 static int nfs41_test_stateid(struct nfs_server *server, 10302 nfs4_stateid *stateid, 10303 const struct cred *cred) 10304 { 10305 struct nfs4_exception exception = { 10306 .interruptible = true, 10307 }; 10308 int err; 10309 do { 10310 err = _nfs41_test_stateid(server, stateid, cred); 10311 nfs4_handle_delay_or_session_error(server, err, &exception); 10312 } while (exception.retry); 10313 return err; 10314 } 10315 10316 struct nfs_free_stateid_data { 10317 struct nfs_server *server; 10318 struct nfs41_free_stateid_args args; 10319 struct nfs41_free_stateid_res res; 10320 }; 10321 10322 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10323 { 10324 struct nfs_free_stateid_data *data = calldata; 10325 nfs4_setup_sequence(data->server->nfs_client, 10326 &data->args.seq_args, 10327 &data->res.seq_res, 10328 task); 10329 } 10330 10331 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10332 { 10333 struct nfs_free_stateid_data *data = calldata; 10334 10335 nfs41_sequence_done(task, &data->res.seq_res); 10336 10337 switch (task->tk_status) { 10338 case -NFS4ERR_DELAY: 10339 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10340 rpc_restart_call_prepare(task); 10341 } 10342 } 10343 10344 static void nfs41_free_stateid_release(void *calldata) 10345 { 10346 struct nfs_free_stateid_data *data = calldata; 10347 struct nfs_client *clp = data->server->nfs_client; 10348 10349 nfs_put_client(clp); 10350 kfree(calldata); 10351 } 10352 10353 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10354 .rpc_call_prepare = nfs41_free_stateid_prepare, 10355 .rpc_call_done = nfs41_free_stateid_done, 10356 .rpc_release = nfs41_free_stateid_release, 10357 }; 10358 10359 /** 10360 * nfs41_free_stateid - perform a FREE_STATEID operation 10361 * 10362 * @server: server / transport on which to perform the operation 10363 * @stateid: state ID to release 10364 * @cred: credential 10365 * @privileged: set to true if this call needs to be privileged 10366 * 10367 * Note: this function is always asynchronous. 10368 */ 10369 static int nfs41_free_stateid(struct nfs_server *server, 10370 const nfs4_stateid *stateid, 10371 const struct cred *cred, 10372 bool privileged) 10373 { 10374 struct rpc_message msg = { 10375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10376 .rpc_cred = cred, 10377 }; 10378 struct rpc_task_setup task_setup = { 10379 .rpc_client = server->client, 10380 .rpc_message = &msg, 10381 .callback_ops = &nfs41_free_stateid_ops, 10382 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10383 }; 10384 struct nfs_free_stateid_data *data; 10385 struct rpc_task *task; 10386 struct nfs_client *clp = server->nfs_client; 10387 10388 if (!refcount_inc_not_zero(&clp->cl_count)) 10389 return -EIO; 10390 10391 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10392 &task_setup.rpc_client, &msg); 10393 10394 dprintk("NFS call free_stateid %p\n", stateid); 10395 data = kmalloc(sizeof(*data), GFP_KERNEL); 10396 if (!data) 10397 return -ENOMEM; 10398 data->server = server; 10399 nfs4_stateid_copy(&data->args.stateid, stateid); 10400 10401 task_setup.callback_data = data; 10402 10403 msg.rpc_argp = &data->args; 10404 msg.rpc_resp = &data->res; 10405 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10406 task = rpc_run_task(&task_setup); 10407 if (IS_ERR(task)) 10408 return PTR_ERR(task); 10409 rpc_put_task(task); 10410 return 0; 10411 } 10412 10413 static void 10414 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10415 { 10416 const struct cred *cred = lsp->ls_state->owner->so_cred; 10417 10418 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10419 nfs4_free_lock_state(server, lsp); 10420 } 10421 10422 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10423 const nfs4_stateid *s2) 10424 { 10425 if (s1->type != s2->type) 10426 return false; 10427 10428 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10429 return false; 10430 10431 if (s1->seqid == s2->seqid) 10432 return true; 10433 10434 return s1->seqid == 0 || s2->seqid == 0; 10435 } 10436 10437 #endif /* CONFIG_NFS_V4_1 */ 10438 10439 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10440 const nfs4_stateid *s2) 10441 { 10442 return nfs4_stateid_match(s1, s2); 10443 } 10444 10445 10446 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10447 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10448 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10449 .recover_open = nfs4_open_reclaim, 10450 .recover_lock = nfs4_lock_reclaim, 10451 .establish_clid = nfs4_init_clientid, 10452 .detect_trunking = nfs40_discover_server_trunking, 10453 }; 10454 10455 #if defined(CONFIG_NFS_V4_1) 10456 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10457 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10458 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10459 .recover_open = nfs4_open_reclaim, 10460 .recover_lock = nfs4_lock_reclaim, 10461 .establish_clid = nfs41_init_clientid, 10462 .reclaim_complete = nfs41_proc_reclaim_complete, 10463 .detect_trunking = nfs41_discover_server_trunking, 10464 }; 10465 #endif /* CONFIG_NFS_V4_1 */ 10466 10467 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10468 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10469 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10470 .recover_open = nfs40_open_expired, 10471 .recover_lock = nfs4_lock_expired, 10472 .establish_clid = nfs4_init_clientid, 10473 }; 10474 10475 #if defined(CONFIG_NFS_V4_1) 10476 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10477 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10478 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10479 .recover_open = nfs41_open_expired, 10480 .recover_lock = nfs41_lock_expired, 10481 .establish_clid = nfs41_init_clientid, 10482 }; 10483 #endif /* CONFIG_NFS_V4_1 */ 10484 10485 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10486 .sched_state_renewal = nfs4_proc_async_renew, 10487 .get_state_renewal_cred = nfs4_get_renew_cred, 10488 .renew_lease = nfs4_proc_renew, 10489 }; 10490 10491 #if defined(CONFIG_NFS_V4_1) 10492 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10493 .sched_state_renewal = nfs41_proc_async_sequence, 10494 .get_state_renewal_cred = nfs4_get_machine_cred, 10495 .renew_lease = nfs4_proc_sequence, 10496 }; 10497 #endif 10498 10499 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10500 .get_locations = _nfs40_proc_get_locations, 10501 .fsid_present = _nfs40_proc_fsid_present, 10502 }; 10503 10504 #if defined(CONFIG_NFS_V4_1) 10505 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10506 .get_locations = _nfs41_proc_get_locations, 10507 .fsid_present = _nfs41_proc_fsid_present, 10508 }; 10509 #endif /* CONFIG_NFS_V4_1 */ 10510 10511 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10512 .minor_version = 0, 10513 .init_caps = NFS_CAP_READDIRPLUS 10514 | NFS_CAP_ATOMIC_OPEN 10515 | NFS_CAP_POSIX_LOCK, 10516 .init_client = nfs40_init_client, 10517 .shutdown_client = nfs40_shutdown_client, 10518 .match_stateid = nfs4_match_stateid, 10519 .find_root_sec = nfs4_find_root_sec, 10520 .free_lock_state = nfs4_release_lockowner, 10521 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10522 .alloc_seqid = nfs_alloc_seqid, 10523 .call_sync_ops = &nfs40_call_sync_ops, 10524 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10525 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10526 .state_renewal_ops = &nfs40_state_renewal_ops, 10527 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10528 }; 10529 10530 #if defined(CONFIG_NFS_V4_1) 10531 static struct nfs_seqid * 10532 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10533 { 10534 return NULL; 10535 } 10536 10537 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10538 .minor_version = 1, 10539 .init_caps = NFS_CAP_READDIRPLUS 10540 | NFS_CAP_ATOMIC_OPEN 10541 | NFS_CAP_POSIX_LOCK 10542 | NFS_CAP_STATEID_NFSV41 10543 | NFS_CAP_ATOMIC_OPEN_V1 10544 | NFS_CAP_LGOPEN 10545 | NFS_CAP_MOVEABLE, 10546 .init_client = nfs41_init_client, 10547 .shutdown_client = nfs41_shutdown_client, 10548 .match_stateid = nfs41_match_stateid, 10549 .find_root_sec = nfs41_find_root_sec, 10550 .free_lock_state = nfs41_free_lock_state, 10551 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10552 .alloc_seqid = nfs_alloc_no_seqid, 10553 .session_trunk = nfs4_test_session_trunk, 10554 .call_sync_ops = &nfs41_call_sync_ops, 10555 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10556 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10557 .state_renewal_ops = &nfs41_state_renewal_ops, 10558 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10559 }; 10560 #endif 10561 10562 #if defined(CONFIG_NFS_V4_2) 10563 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10564 .minor_version = 2, 10565 .init_caps = NFS_CAP_READDIRPLUS 10566 | NFS_CAP_ATOMIC_OPEN 10567 | NFS_CAP_POSIX_LOCK 10568 | NFS_CAP_STATEID_NFSV41 10569 | NFS_CAP_ATOMIC_OPEN_V1 10570 | NFS_CAP_LGOPEN 10571 | NFS_CAP_ALLOCATE 10572 | NFS_CAP_COPY 10573 | NFS_CAP_OFFLOAD_CANCEL 10574 | NFS_CAP_COPY_NOTIFY 10575 | NFS_CAP_DEALLOCATE 10576 | NFS_CAP_SEEK 10577 | NFS_CAP_LAYOUTSTATS 10578 | NFS_CAP_CLONE 10579 | NFS_CAP_LAYOUTERROR 10580 | NFS_CAP_READ_PLUS 10581 | NFS_CAP_MOVEABLE, 10582 .init_client = nfs41_init_client, 10583 .shutdown_client = nfs41_shutdown_client, 10584 .match_stateid = nfs41_match_stateid, 10585 .find_root_sec = nfs41_find_root_sec, 10586 .free_lock_state = nfs41_free_lock_state, 10587 .call_sync_ops = &nfs41_call_sync_ops, 10588 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10589 .alloc_seqid = nfs_alloc_no_seqid, 10590 .session_trunk = nfs4_test_session_trunk, 10591 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10592 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10593 .state_renewal_ops = &nfs41_state_renewal_ops, 10594 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10595 }; 10596 #endif 10597 10598 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10599 [0] = &nfs_v4_0_minor_ops, 10600 #if defined(CONFIG_NFS_V4_1) 10601 [1] = &nfs_v4_1_minor_ops, 10602 #endif 10603 #if defined(CONFIG_NFS_V4_2) 10604 [2] = &nfs_v4_2_minor_ops, 10605 #endif 10606 }; 10607 10608 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10609 { 10610 ssize_t error, error2, error3; 10611 size_t left = size; 10612 10613 error = generic_listxattr(dentry, list, left); 10614 if (error < 0) 10615 return error; 10616 if (list) { 10617 list += error; 10618 left -= error; 10619 } 10620 10621 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left); 10622 if (error2 < 0) 10623 return error2; 10624 10625 if (list) { 10626 list += error2; 10627 left -= error2; 10628 } 10629 10630 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left); 10631 if (error3 < 0) 10632 return error3; 10633 10634 error += error2 + error3; 10635 if (size && error > size) 10636 return -ERANGE; 10637 return error; 10638 } 10639 10640 static void nfs4_enable_swap(struct inode *inode) 10641 { 10642 /* The state manager thread must always be running. 10643 * It will notice the client is a swapper, and stay put. 10644 */ 10645 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10646 10647 nfs4_schedule_state_manager(clp); 10648 } 10649 10650 static void nfs4_disable_swap(struct inode *inode) 10651 { 10652 /* The state manager thread will now exit once it is 10653 * woken. 10654 */ 10655 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10656 10657 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10658 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10659 wake_up_var(&clp->cl_state); 10660 } 10661 10662 static const struct inode_operations nfs4_dir_inode_operations = { 10663 .create = nfs_create, 10664 .lookup = nfs_lookup, 10665 .atomic_open = nfs_atomic_open, 10666 .link = nfs_link, 10667 .unlink = nfs_unlink, 10668 .symlink = nfs_symlink, 10669 .mkdir = nfs_mkdir, 10670 .rmdir = nfs_rmdir, 10671 .mknod = nfs_mknod, 10672 .rename = nfs_rename, 10673 .permission = nfs_permission, 10674 .getattr = nfs_getattr, 10675 .setattr = nfs_setattr, 10676 .listxattr = nfs4_listxattr, 10677 }; 10678 10679 static const struct inode_operations nfs4_file_inode_operations = { 10680 .permission = nfs_permission, 10681 .getattr = nfs_getattr, 10682 .setattr = nfs_setattr, 10683 .listxattr = nfs4_listxattr, 10684 }; 10685 10686 const struct nfs_rpc_ops nfs_v4_clientops = { 10687 .version = 4, /* protocol version */ 10688 .dentry_ops = &nfs4_dentry_operations, 10689 .dir_inode_ops = &nfs4_dir_inode_operations, 10690 .file_inode_ops = &nfs4_file_inode_operations, 10691 .file_ops = &nfs4_file_operations, 10692 .getroot = nfs4_proc_get_root, 10693 .submount = nfs4_submount, 10694 .try_get_tree = nfs4_try_get_tree, 10695 .getattr = nfs4_proc_getattr, 10696 .setattr = nfs4_proc_setattr, 10697 .lookup = nfs4_proc_lookup, 10698 .lookupp = nfs4_proc_lookupp, 10699 .access = nfs4_proc_access, 10700 .readlink = nfs4_proc_readlink, 10701 .create = nfs4_proc_create, 10702 .remove = nfs4_proc_remove, 10703 .unlink_setup = nfs4_proc_unlink_setup, 10704 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10705 .unlink_done = nfs4_proc_unlink_done, 10706 .rename_setup = nfs4_proc_rename_setup, 10707 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10708 .rename_done = nfs4_proc_rename_done, 10709 .link = nfs4_proc_link, 10710 .symlink = nfs4_proc_symlink, 10711 .mkdir = nfs4_proc_mkdir, 10712 .rmdir = nfs4_proc_rmdir, 10713 .readdir = nfs4_proc_readdir, 10714 .mknod = nfs4_proc_mknod, 10715 .statfs = nfs4_proc_statfs, 10716 .fsinfo = nfs4_proc_fsinfo, 10717 .pathconf = nfs4_proc_pathconf, 10718 .set_capabilities = nfs4_server_capabilities, 10719 .decode_dirent = nfs4_decode_dirent, 10720 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10721 .read_setup = nfs4_proc_read_setup, 10722 .read_done = nfs4_read_done, 10723 .write_setup = nfs4_proc_write_setup, 10724 .write_done = nfs4_write_done, 10725 .commit_setup = nfs4_proc_commit_setup, 10726 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10727 .commit_done = nfs4_commit_done, 10728 .lock = nfs4_proc_lock, 10729 .clear_acl_cache = nfs4_zap_acl_attr, 10730 .close_context = nfs4_close_context, 10731 .open_context = nfs4_atomic_open, 10732 .have_delegation = nfs4_have_delegation, 10733 .alloc_client = nfs4_alloc_client, 10734 .init_client = nfs4_init_client, 10735 .free_client = nfs4_free_client, 10736 .create_server = nfs4_create_server, 10737 .clone_server = nfs_clone_server, 10738 .discover_trunking = nfs4_discover_trunking, 10739 .enable_swap = nfs4_enable_swap, 10740 .disable_swap = nfs4_disable_swap, 10741 }; 10742 10743 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10744 .name = XATTR_NAME_NFSV4_ACL, 10745 .list = nfs4_xattr_list_nfs4_acl, 10746 .get = nfs4_xattr_get_nfs4_acl, 10747 .set = nfs4_xattr_set_nfs4_acl, 10748 }; 10749 10750 #if defined(CONFIG_NFS_V4_1) 10751 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10752 .name = XATTR_NAME_NFSV4_DACL, 10753 .list = nfs4_xattr_list_nfs4_dacl, 10754 .get = nfs4_xattr_get_nfs4_dacl, 10755 .set = nfs4_xattr_set_nfs4_dacl, 10756 }; 10757 10758 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10759 .name = XATTR_NAME_NFSV4_SACL, 10760 .list = nfs4_xattr_list_nfs4_sacl, 10761 .get = nfs4_xattr_get_nfs4_sacl, 10762 .set = nfs4_xattr_set_nfs4_sacl, 10763 }; 10764 #endif 10765 10766 #ifdef CONFIG_NFS_V4_2 10767 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10768 .prefix = XATTR_USER_PREFIX, 10769 .get = nfs4_xattr_get_nfs4_user, 10770 .set = nfs4_xattr_set_nfs4_user, 10771 }; 10772 #endif 10773 10774 const struct xattr_handler *nfs4_xattr_handlers[] = { 10775 &nfs4_xattr_nfs4_acl_handler, 10776 #if defined(CONFIG_NFS_V4_1) 10777 &nfs4_xattr_nfs4_dacl_handler, 10778 &nfs4_xattr_nfs4_sacl_handler, 10779 #endif 10780 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10781 &nfs4_xattr_nfs4_label_handler, 10782 #endif 10783 #ifdef CONFIG_NFS_V4_2 10784 &nfs4_xattr_nfs4_user_handler, 10785 #endif 10786 NULL 10787 }; 10788