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 /* In case of error, no cleanup! */ 2532 if (data->rpc_status != 0 || !data->rpc_done) { 2533 nfs_release_seqid(data->o_arg.seqid); 2534 goto out_free; 2535 } 2536 /* If this request hasn't been cancelled, do nothing */ 2537 if (!data->cancelled) 2538 goto out_free; 2539 /* In case we need an open_confirm, no cleanup! */ 2540 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2541 goto out_free; 2542 state = nfs4_opendata_to_nfs4_state(data); 2543 if (!IS_ERR(state)) 2544 nfs4_close_state(state, data->o_arg.fmode); 2545 out_free: 2546 nfs4_opendata_put(data); 2547 } 2548 2549 static const struct rpc_call_ops nfs4_open_ops = { 2550 .rpc_call_prepare = nfs4_open_prepare, 2551 .rpc_call_done = nfs4_open_done, 2552 .rpc_release = nfs4_open_release, 2553 }; 2554 2555 static int nfs4_run_open_task(struct nfs4_opendata *data, 2556 struct nfs_open_context *ctx) 2557 { 2558 struct inode *dir = d_inode(data->dir); 2559 struct nfs_server *server = NFS_SERVER(dir); 2560 struct nfs_openargs *o_arg = &data->o_arg; 2561 struct nfs_openres *o_res = &data->o_res; 2562 struct rpc_task *task; 2563 struct rpc_message msg = { 2564 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2565 .rpc_argp = o_arg, 2566 .rpc_resp = o_res, 2567 .rpc_cred = data->owner->so_cred, 2568 }; 2569 struct rpc_task_setup task_setup_data = { 2570 .rpc_client = server->client, 2571 .rpc_message = &msg, 2572 .callback_ops = &nfs4_open_ops, 2573 .callback_data = data, 2574 .workqueue = nfsiod_workqueue, 2575 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2576 }; 2577 int status; 2578 2579 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2580 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2581 2582 kref_get(&data->kref); 2583 data->rpc_done = false; 2584 data->rpc_status = 0; 2585 data->cancelled = false; 2586 data->is_recover = false; 2587 if (!ctx) { 2588 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2589 data->is_recover = true; 2590 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2591 } else { 2592 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2593 pnfs_lgopen_prepare(data, ctx); 2594 } 2595 task = rpc_run_task(&task_setup_data); 2596 if (IS_ERR(task)) 2597 return PTR_ERR(task); 2598 status = rpc_wait_for_completion_task(task); 2599 if (status != 0) { 2600 data->cancelled = true; 2601 smp_wmb(); 2602 } else 2603 status = data->rpc_status; 2604 rpc_put_task(task); 2605 2606 return status; 2607 } 2608 2609 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2610 { 2611 struct inode *dir = d_inode(data->dir); 2612 struct nfs_openres *o_res = &data->o_res; 2613 int status; 2614 2615 status = nfs4_run_open_task(data, NULL); 2616 if (status != 0 || !data->rpc_done) 2617 return status; 2618 2619 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2620 2621 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2622 status = _nfs4_proc_open_confirm(data); 2623 2624 return status; 2625 } 2626 2627 /* 2628 * Additional permission checks in order to distinguish between an 2629 * open for read, and an open for execute. This works around the 2630 * fact that NFSv4 OPEN treats read and execute permissions as being 2631 * the same. 2632 * Note that in the non-execute case, we want to turn off permission 2633 * checking if we just created a new file (POSIX open() semantics). 2634 */ 2635 static int nfs4_opendata_access(const struct cred *cred, 2636 struct nfs4_opendata *opendata, 2637 struct nfs4_state *state, fmode_t fmode) 2638 { 2639 struct nfs_access_entry cache; 2640 u32 mask, flags; 2641 2642 /* access call failed or for some reason the server doesn't 2643 * support any access modes -- defer access call until later */ 2644 if (opendata->o_res.access_supported == 0) 2645 return 0; 2646 2647 mask = 0; 2648 if (fmode & FMODE_EXEC) { 2649 /* ONLY check for exec rights */ 2650 if (S_ISDIR(state->inode->i_mode)) 2651 mask = NFS4_ACCESS_LOOKUP; 2652 else 2653 mask = NFS4_ACCESS_EXECUTE; 2654 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2655 mask = NFS4_ACCESS_READ; 2656 2657 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2658 nfs_access_add_cache(state->inode, &cache, cred); 2659 2660 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2661 if ((mask & ~cache.mask & flags) == 0) 2662 return 0; 2663 2664 return -EACCES; 2665 } 2666 2667 /* 2668 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2669 */ 2670 static int _nfs4_proc_open(struct nfs4_opendata *data, 2671 struct nfs_open_context *ctx) 2672 { 2673 struct inode *dir = d_inode(data->dir); 2674 struct nfs_server *server = NFS_SERVER(dir); 2675 struct nfs_openargs *o_arg = &data->o_arg; 2676 struct nfs_openres *o_res = &data->o_res; 2677 int status; 2678 2679 status = nfs4_run_open_task(data, ctx); 2680 if (!data->rpc_done) 2681 return status; 2682 if (status != 0) { 2683 if (status == -NFS4ERR_BADNAME && 2684 !(o_arg->open_flags & O_CREAT)) 2685 return -ENOENT; 2686 return status; 2687 } 2688 2689 nfs_fattr_map_and_free_names(server, &data->f_attr); 2690 2691 if (o_arg->open_flags & O_CREAT) { 2692 if (o_arg->open_flags & O_EXCL) 2693 data->file_created = true; 2694 else if (o_res->cinfo.before != o_res->cinfo.after) 2695 data->file_created = true; 2696 if (data->file_created || 2697 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2698 nfs4_update_changeattr(dir, &o_res->cinfo, 2699 o_res->f_attr->time_start, 2700 NFS_INO_INVALID_DATA); 2701 } 2702 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2703 server->caps &= ~NFS_CAP_POSIX_LOCK; 2704 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2705 status = _nfs4_proc_open_confirm(data); 2706 if (status != 0) 2707 return status; 2708 } 2709 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2710 struct nfs_fh *fh = &o_res->fh; 2711 2712 nfs4_sequence_free_slot(&o_res->seq_res); 2713 if (o_arg->claim == NFS4_OPEN_CLAIM_FH) 2714 fh = NFS_FH(d_inode(data->dentry)); 2715 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL); 2716 } 2717 return 0; 2718 } 2719 2720 /* 2721 * OPEN_EXPIRED: 2722 * reclaim state on the server after a network partition. 2723 * Assumes caller holds the appropriate lock 2724 */ 2725 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2726 { 2727 struct nfs4_opendata *opendata; 2728 int ret; 2729 2730 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2731 if (IS_ERR(opendata)) 2732 return PTR_ERR(opendata); 2733 /* 2734 * We're not recovering a delegation, so ask for no delegation. 2735 * Otherwise the recovery thread could deadlock with an outstanding 2736 * delegation return. 2737 */ 2738 opendata->o_arg.open_flags = O_DIRECT; 2739 ret = nfs4_open_recover(opendata, state); 2740 if (ret == -ESTALE) 2741 d_drop(ctx->dentry); 2742 nfs4_opendata_put(opendata); 2743 return ret; 2744 } 2745 2746 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2747 { 2748 struct nfs_server *server = NFS_SERVER(state->inode); 2749 struct nfs4_exception exception = { }; 2750 int err; 2751 2752 do { 2753 err = _nfs4_open_expired(ctx, state); 2754 trace_nfs4_open_expired(ctx, 0, err); 2755 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2756 continue; 2757 switch (err) { 2758 default: 2759 goto out; 2760 case -NFS4ERR_GRACE: 2761 case -NFS4ERR_DELAY: 2762 nfs4_handle_exception(server, err, &exception); 2763 err = 0; 2764 } 2765 } while (exception.retry); 2766 out: 2767 return err; 2768 } 2769 2770 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2771 { 2772 struct nfs_open_context *ctx; 2773 int ret; 2774 2775 ctx = nfs4_state_find_open_context(state); 2776 if (IS_ERR(ctx)) 2777 return -EAGAIN; 2778 ret = nfs4_do_open_expired(ctx, state); 2779 put_nfs_open_context(ctx); 2780 return ret; 2781 } 2782 2783 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2784 const nfs4_stateid *stateid) 2785 { 2786 nfs_remove_bad_delegation(state->inode, stateid); 2787 nfs_state_clear_delegation(state); 2788 } 2789 2790 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2791 { 2792 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2793 nfs_finish_clear_delegation_stateid(state, NULL); 2794 } 2795 2796 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2797 { 2798 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2799 nfs40_clear_delegation_stateid(state); 2800 nfs_state_clear_open_state_flags(state); 2801 return nfs4_open_expired(sp, state); 2802 } 2803 2804 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2805 nfs4_stateid *stateid, 2806 const struct cred *cred) 2807 { 2808 return -NFS4ERR_BAD_STATEID; 2809 } 2810 2811 #if defined(CONFIG_NFS_V4_1) 2812 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2813 nfs4_stateid *stateid, 2814 const struct cred *cred) 2815 { 2816 int status; 2817 2818 switch (stateid->type) { 2819 default: 2820 break; 2821 case NFS4_INVALID_STATEID_TYPE: 2822 case NFS4_SPECIAL_STATEID_TYPE: 2823 return -NFS4ERR_BAD_STATEID; 2824 case NFS4_REVOKED_STATEID_TYPE: 2825 goto out_free; 2826 } 2827 2828 status = nfs41_test_stateid(server, stateid, cred); 2829 switch (status) { 2830 case -NFS4ERR_EXPIRED: 2831 case -NFS4ERR_ADMIN_REVOKED: 2832 case -NFS4ERR_DELEG_REVOKED: 2833 break; 2834 default: 2835 return status; 2836 } 2837 out_free: 2838 /* Ack the revoked state to the server */ 2839 nfs41_free_stateid(server, stateid, cred, true); 2840 return -NFS4ERR_EXPIRED; 2841 } 2842 2843 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2844 { 2845 struct nfs_server *server = NFS_SERVER(state->inode); 2846 nfs4_stateid stateid; 2847 struct nfs_delegation *delegation; 2848 const struct cred *cred = NULL; 2849 int status, ret = NFS_OK; 2850 2851 /* Get the delegation credential for use by test/free_stateid */ 2852 rcu_read_lock(); 2853 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2854 if (delegation == NULL) { 2855 rcu_read_unlock(); 2856 nfs_state_clear_delegation(state); 2857 return NFS_OK; 2858 } 2859 2860 spin_lock(&delegation->lock); 2861 nfs4_stateid_copy(&stateid, &delegation->stateid); 2862 2863 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2864 &delegation->flags)) { 2865 spin_unlock(&delegation->lock); 2866 rcu_read_unlock(); 2867 return NFS_OK; 2868 } 2869 2870 if (delegation->cred) 2871 cred = get_cred(delegation->cred); 2872 spin_unlock(&delegation->lock); 2873 rcu_read_unlock(); 2874 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2875 trace_nfs4_test_delegation_stateid(state, NULL, status); 2876 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2877 nfs_finish_clear_delegation_stateid(state, &stateid); 2878 else 2879 ret = status; 2880 2881 put_cred(cred); 2882 return ret; 2883 } 2884 2885 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2886 { 2887 nfs4_stateid tmp; 2888 2889 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2890 nfs4_copy_delegation_stateid(state->inode, state->state, 2891 &tmp, NULL) && 2892 nfs4_stateid_match_other(&state->stateid, &tmp)) 2893 nfs_state_set_delegation(state, &tmp, state->state); 2894 else 2895 nfs_state_clear_delegation(state); 2896 } 2897 2898 /** 2899 * nfs41_check_expired_locks - possibly free a lock stateid 2900 * 2901 * @state: NFSv4 state for an inode 2902 * 2903 * Returns NFS_OK if recovery for this stateid is now finished. 2904 * Otherwise a negative NFS4ERR value is returned. 2905 */ 2906 static int nfs41_check_expired_locks(struct nfs4_state *state) 2907 { 2908 int status, ret = NFS_OK; 2909 struct nfs4_lock_state *lsp, *prev = NULL; 2910 struct nfs_server *server = NFS_SERVER(state->inode); 2911 2912 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2913 goto out; 2914 2915 spin_lock(&state->state_lock); 2916 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2917 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2918 const struct cred *cred = lsp->ls_state->owner->so_cred; 2919 2920 refcount_inc(&lsp->ls_count); 2921 spin_unlock(&state->state_lock); 2922 2923 nfs4_put_lock_state(prev); 2924 prev = lsp; 2925 2926 status = nfs41_test_and_free_expired_stateid(server, 2927 &lsp->ls_stateid, 2928 cred); 2929 trace_nfs4_test_lock_stateid(state, lsp, status); 2930 if (status == -NFS4ERR_EXPIRED || 2931 status == -NFS4ERR_BAD_STATEID) { 2932 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2933 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2934 if (!recover_lost_locks) 2935 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2936 } else if (status != NFS_OK) { 2937 ret = status; 2938 nfs4_put_lock_state(prev); 2939 goto out; 2940 } 2941 spin_lock(&state->state_lock); 2942 } 2943 } 2944 spin_unlock(&state->state_lock); 2945 nfs4_put_lock_state(prev); 2946 out: 2947 return ret; 2948 } 2949 2950 /** 2951 * nfs41_check_open_stateid - possibly free an open stateid 2952 * 2953 * @state: NFSv4 state for an inode 2954 * 2955 * Returns NFS_OK if recovery for this stateid is now finished. 2956 * Otherwise a negative NFS4ERR value is returned. 2957 */ 2958 static int nfs41_check_open_stateid(struct nfs4_state *state) 2959 { 2960 struct nfs_server *server = NFS_SERVER(state->inode); 2961 nfs4_stateid *stateid = &state->open_stateid; 2962 const struct cred *cred = state->owner->so_cred; 2963 int status; 2964 2965 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2966 return -NFS4ERR_BAD_STATEID; 2967 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2968 trace_nfs4_test_open_stateid(state, NULL, status); 2969 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2970 nfs_state_clear_open_state_flags(state); 2971 stateid->type = NFS4_INVALID_STATEID_TYPE; 2972 return status; 2973 } 2974 if (nfs_open_stateid_recover_openmode(state)) 2975 return -NFS4ERR_OPENMODE; 2976 return NFS_OK; 2977 } 2978 2979 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2980 { 2981 int status; 2982 2983 status = nfs41_check_delegation_stateid(state); 2984 if (status != NFS_OK) 2985 return status; 2986 nfs41_delegation_recover_stateid(state); 2987 2988 status = nfs41_check_expired_locks(state); 2989 if (status != NFS_OK) 2990 return status; 2991 status = nfs41_check_open_stateid(state); 2992 if (status != NFS_OK) 2993 status = nfs4_open_expired(sp, state); 2994 return status; 2995 } 2996 #endif 2997 2998 /* 2999 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 3000 * fields corresponding to attributes that were used to store the verifier. 3001 * Make sure we clobber those fields in the later setattr call 3002 */ 3003 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 3004 struct iattr *sattr, struct nfs4_label **label) 3005 { 3006 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 3007 __u32 attrset[3]; 3008 unsigned ret; 3009 unsigned i; 3010 3011 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3012 attrset[i] = opendata->o_res.attrset[i]; 3013 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3014 attrset[i] &= ~bitmask[i]; 3015 } 3016 3017 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3018 sattr->ia_valid : 0; 3019 3020 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3021 if (sattr->ia_valid & ATTR_ATIME_SET) 3022 ret |= ATTR_ATIME_SET; 3023 else 3024 ret |= ATTR_ATIME; 3025 } 3026 3027 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3028 if (sattr->ia_valid & ATTR_MTIME_SET) 3029 ret |= ATTR_MTIME_SET; 3030 else 3031 ret |= ATTR_MTIME; 3032 } 3033 3034 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3035 *label = NULL; 3036 return ret; 3037 } 3038 3039 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3040 struct nfs_open_context *ctx) 3041 { 3042 struct nfs4_state_owner *sp = opendata->owner; 3043 struct nfs_server *server = sp->so_server; 3044 struct dentry *dentry; 3045 struct nfs4_state *state; 3046 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3047 struct inode *dir = d_inode(opendata->dir); 3048 unsigned long dir_verifier; 3049 unsigned int seq; 3050 int ret; 3051 3052 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3053 dir_verifier = nfs_save_change_attribute(dir); 3054 3055 ret = _nfs4_proc_open(opendata, ctx); 3056 if (ret != 0) 3057 goto out; 3058 3059 state = _nfs4_opendata_to_nfs4_state(opendata); 3060 ret = PTR_ERR(state); 3061 if (IS_ERR(state)) 3062 goto out; 3063 ctx->state = state; 3064 if (server->caps & NFS_CAP_POSIX_LOCK) 3065 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3066 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3067 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3068 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3069 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3070 3071 dentry = opendata->dentry; 3072 if (d_really_is_negative(dentry)) { 3073 struct dentry *alias; 3074 d_drop(dentry); 3075 alias = d_exact_alias(dentry, state->inode); 3076 if (!alias) 3077 alias = d_splice_alias(igrab(state->inode), dentry); 3078 /* d_splice_alias() can't fail here - it's a non-directory */ 3079 if (alias) { 3080 dput(ctx->dentry); 3081 ctx->dentry = dentry = alias; 3082 } 3083 } 3084 3085 switch(opendata->o_arg.claim) { 3086 default: 3087 break; 3088 case NFS4_OPEN_CLAIM_NULL: 3089 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3090 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3091 if (!opendata->rpc_done) 3092 break; 3093 if (opendata->o_res.delegation_type != 0) 3094 dir_verifier = nfs_save_change_attribute(dir); 3095 nfs_set_verifier(dentry, dir_verifier); 3096 } 3097 3098 /* Parse layoutget results before we check for access */ 3099 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3100 3101 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3102 if (ret != 0) 3103 goto out; 3104 3105 if (d_inode(dentry) == state->inode) { 3106 nfs_inode_attach_open_context(ctx); 3107 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3108 nfs4_schedule_stateid_recovery(server, state); 3109 } 3110 3111 out: 3112 if (!opendata->cancelled) { 3113 if (opendata->lgp) { 3114 nfs4_lgopen_release(opendata->lgp); 3115 opendata->lgp = NULL; 3116 } 3117 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3118 } 3119 return ret; 3120 } 3121 3122 /* 3123 * Returns a referenced nfs4_state 3124 */ 3125 static int _nfs4_do_open(struct inode *dir, 3126 struct nfs_open_context *ctx, 3127 int flags, 3128 const struct nfs4_open_createattrs *c, 3129 int *opened) 3130 { 3131 struct nfs4_state_owner *sp; 3132 struct nfs4_state *state = NULL; 3133 struct nfs_server *server = NFS_SERVER(dir); 3134 struct nfs4_opendata *opendata; 3135 struct dentry *dentry = ctx->dentry; 3136 const struct cred *cred = ctx->cred; 3137 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3138 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3139 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3140 struct iattr *sattr = c->sattr; 3141 struct nfs4_label *label = c->label; 3142 int status; 3143 3144 /* Protect against reboot recovery conflicts */ 3145 status = -ENOMEM; 3146 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3147 if (sp == NULL) { 3148 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3149 goto out_err; 3150 } 3151 status = nfs4_client_recover_expired_lease(server->nfs_client); 3152 if (status != 0) 3153 goto err_put_state_owner; 3154 if (d_really_is_positive(dentry)) 3155 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3156 status = -ENOMEM; 3157 if (d_really_is_positive(dentry)) 3158 claim = NFS4_OPEN_CLAIM_FH; 3159 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3160 c, claim, GFP_KERNEL); 3161 if (opendata == NULL) 3162 goto err_put_state_owner; 3163 3164 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3165 if (!opendata->f_attr.mdsthreshold) { 3166 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3167 if (!opendata->f_attr.mdsthreshold) 3168 goto err_opendata_put; 3169 } 3170 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3171 } 3172 if (d_really_is_positive(dentry)) 3173 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3174 3175 status = _nfs4_open_and_get_state(opendata, ctx); 3176 if (status != 0) 3177 goto err_opendata_put; 3178 state = ctx->state; 3179 3180 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3181 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3182 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3183 /* 3184 * send create attributes which was not set by open 3185 * with an extra setattr. 3186 */ 3187 if (attrs || label) { 3188 unsigned ia_old = sattr->ia_valid; 3189 3190 sattr->ia_valid = attrs; 3191 nfs_fattr_init(opendata->o_res.f_attr); 3192 status = nfs4_do_setattr(state->inode, cred, 3193 opendata->o_res.f_attr, sattr, 3194 ctx, label); 3195 if (status == 0) { 3196 nfs_setattr_update_inode(state->inode, sattr, 3197 opendata->o_res.f_attr); 3198 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3199 } 3200 sattr->ia_valid = ia_old; 3201 } 3202 } 3203 if (opened && opendata->file_created) 3204 *opened = 1; 3205 3206 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3207 *ctx_th = opendata->f_attr.mdsthreshold; 3208 opendata->f_attr.mdsthreshold = NULL; 3209 } 3210 3211 nfs4_opendata_put(opendata); 3212 nfs4_put_state_owner(sp); 3213 return 0; 3214 err_opendata_put: 3215 nfs4_opendata_put(opendata); 3216 err_put_state_owner: 3217 nfs4_put_state_owner(sp); 3218 out_err: 3219 return status; 3220 } 3221 3222 3223 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3224 struct nfs_open_context *ctx, 3225 int flags, 3226 struct iattr *sattr, 3227 struct nfs4_label *label, 3228 int *opened) 3229 { 3230 struct nfs_server *server = NFS_SERVER(dir); 3231 struct nfs4_exception exception = { 3232 .interruptible = true, 3233 }; 3234 struct nfs4_state *res; 3235 struct nfs4_open_createattrs c = { 3236 .label = label, 3237 .sattr = sattr, 3238 .verf = { 3239 [0] = (__u32)jiffies, 3240 [1] = (__u32)current->pid, 3241 }, 3242 }; 3243 int status; 3244 3245 do { 3246 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3247 res = ctx->state; 3248 trace_nfs4_open_file(ctx, flags, status); 3249 if (status == 0) 3250 break; 3251 /* NOTE: BAD_SEQID means the server and client disagree about the 3252 * book-keeping w.r.t. state-changing operations 3253 * (OPEN/CLOSE/LOCK/LOCKU...) 3254 * It is actually a sign of a bug on the client or on the server. 3255 * 3256 * If we receive a BAD_SEQID error in the particular case of 3257 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3258 * have unhashed the old state_owner for us, and that we can 3259 * therefore safely retry using a new one. We should still warn 3260 * the user though... 3261 */ 3262 if (status == -NFS4ERR_BAD_SEQID) { 3263 pr_warn_ratelimited("NFS: v4 server %s " 3264 " returned a bad sequence-id error!\n", 3265 NFS_SERVER(dir)->nfs_client->cl_hostname); 3266 exception.retry = 1; 3267 continue; 3268 } 3269 /* 3270 * BAD_STATEID on OPEN means that the server cancelled our 3271 * state before it received the OPEN_CONFIRM. 3272 * Recover by retrying the request as per the discussion 3273 * on Page 181 of RFC3530. 3274 */ 3275 if (status == -NFS4ERR_BAD_STATEID) { 3276 exception.retry = 1; 3277 continue; 3278 } 3279 if (status == -NFS4ERR_EXPIRED) { 3280 nfs4_schedule_lease_recovery(server->nfs_client); 3281 exception.retry = 1; 3282 continue; 3283 } 3284 if (status == -EAGAIN) { 3285 /* We must have found a delegation */ 3286 exception.retry = 1; 3287 continue; 3288 } 3289 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3290 continue; 3291 res = ERR_PTR(nfs4_handle_exception(server, 3292 status, &exception)); 3293 } while (exception.retry); 3294 return res; 3295 } 3296 3297 static int _nfs4_do_setattr(struct inode *inode, 3298 struct nfs_setattrargs *arg, 3299 struct nfs_setattrres *res, 3300 const struct cred *cred, 3301 struct nfs_open_context *ctx) 3302 { 3303 struct nfs_server *server = NFS_SERVER(inode); 3304 struct rpc_message msg = { 3305 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3306 .rpc_argp = arg, 3307 .rpc_resp = res, 3308 .rpc_cred = cred, 3309 }; 3310 const struct cred *delegation_cred = NULL; 3311 unsigned long timestamp = jiffies; 3312 bool truncate; 3313 int status; 3314 3315 nfs_fattr_init(res->fattr); 3316 3317 /* Servers should only apply open mode checks for file size changes */ 3318 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3319 if (!truncate) { 3320 nfs4_inode_make_writeable(inode); 3321 goto zero_stateid; 3322 } 3323 3324 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3325 /* Use that stateid */ 3326 } else if (ctx != NULL && ctx->state) { 3327 struct nfs_lock_context *l_ctx; 3328 if (!nfs4_valid_open_stateid(ctx->state)) 3329 return -EBADF; 3330 l_ctx = nfs_get_lock_context(ctx); 3331 if (IS_ERR(l_ctx)) 3332 return PTR_ERR(l_ctx); 3333 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3334 &arg->stateid, &delegation_cred); 3335 nfs_put_lock_context(l_ctx); 3336 if (status == -EIO) 3337 return -EBADF; 3338 else if (status == -EAGAIN) 3339 goto zero_stateid; 3340 } else { 3341 zero_stateid: 3342 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3343 } 3344 if (delegation_cred) 3345 msg.rpc_cred = delegation_cred; 3346 3347 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3348 3349 put_cred(delegation_cred); 3350 if (status == 0 && ctx != NULL) 3351 renew_lease(server, timestamp); 3352 trace_nfs4_setattr(inode, &arg->stateid, status); 3353 return status; 3354 } 3355 3356 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3357 struct nfs_fattr *fattr, struct iattr *sattr, 3358 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3359 { 3360 struct nfs_server *server = NFS_SERVER(inode); 3361 __u32 bitmask[NFS4_BITMASK_SZ]; 3362 struct nfs4_state *state = ctx ? ctx->state : NULL; 3363 struct nfs_setattrargs arg = { 3364 .fh = NFS_FH(inode), 3365 .iap = sattr, 3366 .server = server, 3367 .bitmask = bitmask, 3368 .label = ilabel, 3369 }; 3370 struct nfs_setattrres res = { 3371 .fattr = fattr, 3372 .server = server, 3373 }; 3374 struct nfs4_exception exception = { 3375 .state = state, 3376 .inode = inode, 3377 .stateid = &arg.stateid, 3378 }; 3379 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3380 int err; 3381 3382 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3383 adjust_flags |= NFS_INO_INVALID_MODE; 3384 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3385 adjust_flags |= NFS_INO_INVALID_OTHER; 3386 3387 do { 3388 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3389 inode, adjust_flags); 3390 3391 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3392 switch (err) { 3393 case -NFS4ERR_OPENMODE: 3394 if (!(sattr->ia_valid & ATTR_SIZE)) { 3395 pr_warn_once("NFSv4: server %s is incorrectly " 3396 "applying open mode checks to " 3397 "a SETATTR that is not " 3398 "changing file size.\n", 3399 server->nfs_client->cl_hostname); 3400 } 3401 if (state && !(state->state & FMODE_WRITE)) { 3402 err = -EBADF; 3403 if (sattr->ia_valid & ATTR_OPEN) 3404 err = -EACCES; 3405 goto out; 3406 } 3407 } 3408 err = nfs4_handle_exception(server, err, &exception); 3409 } while (exception.retry); 3410 out: 3411 return err; 3412 } 3413 3414 static bool 3415 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3416 { 3417 if (inode == NULL || !nfs_have_layout(inode)) 3418 return false; 3419 3420 return pnfs_wait_on_layoutreturn(inode, task); 3421 } 3422 3423 /* 3424 * Update the seqid of an open stateid 3425 */ 3426 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3427 struct nfs4_state *state) 3428 { 3429 __be32 seqid_open; 3430 u32 dst_seqid; 3431 int seq; 3432 3433 for (;;) { 3434 if (!nfs4_valid_open_stateid(state)) 3435 break; 3436 seq = read_seqbegin(&state->seqlock); 3437 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3438 nfs4_stateid_copy(dst, &state->open_stateid); 3439 if (read_seqretry(&state->seqlock, seq)) 3440 continue; 3441 break; 3442 } 3443 seqid_open = state->open_stateid.seqid; 3444 if (read_seqretry(&state->seqlock, seq)) 3445 continue; 3446 3447 dst_seqid = be32_to_cpu(dst->seqid); 3448 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3449 dst->seqid = seqid_open; 3450 break; 3451 } 3452 } 3453 3454 /* 3455 * Update the seqid of an open stateid after receiving 3456 * NFS4ERR_OLD_STATEID 3457 */ 3458 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3459 struct nfs4_state *state) 3460 { 3461 __be32 seqid_open; 3462 u32 dst_seqid; 3463 bool ret; 3464 int seq, status = -EAGAIN; 3465 DEFINE_WAIT(wait); 3466 3467 for (;;) { 3468 ret = false; 3469 if (!nfs4_valid_open_stateid(state)) 3470 break; 3471 seq = read_seqbegin(&state->seqlock); 3472 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3473 if (read_seqretry(&state->seqlock, seq)) 3474 continue; 3475 break; 3476 } 3477 3478 write_seqlock(&state->seqlock); 3479 seqid_open = state->open_stateid.seqid; 3480 3481 dst_seqid = be32_to_cpu(dst->seqid); 3482 3483 /* Did another OPEN bump the state's seqid? try again: */ 3484 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3485 dst->seqid = seqid_open; 3486 write_sequnlock(&state->seqlock); 3487 ret = true; 3488 break; 3489 } 3490 3491 /* server says we're behind but we haven't seen the update yet */ 3492 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3493 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3494 write_sequnlock(&state->seqlock); 3495 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3496 3497 if (fatal_signal_pending(current)) 3498 status = -EINTR; 3499 else 3500 if (schedule_timeout(5*HZ) != 0) 3501 status = 0; 3502 3503 finish_wait(&state->waitq, &wait); 3504 3505 if (!status) 3506 continue; 3507 if (status == -EINTR) 3508 break; 3509 3510 /* we slept the whole 5 seconds, we must have lost a seqid */ 3511 dst->seqid = cpu_to_be32(dst_seqid + 1); 3512 ret = true; 3513 break; 3514 } 3515 3516 return ret; 3517 } 3518 3519 struct nfs4_closedata { 3520 struct inode *inode; 3521 struct nfs4_state *state; 3522 struct nfs_closeargs arg; 3523 struct nfs_closeres res; 3524 struct { 3525 struct nfs4_layoutreturn_args arg; 3526 struct nfs4_layoutreturn_res res; 3527 struct nfs4_xdr_opaque_data ld_private; 3528 u32 roc_barrier; 3529 bool roc; 3530 } lr; 3531 struct nfs_fattr fattr; 3532 unsigned long timestamp; 3533 }; 3534 3535 static void nfs4_free_closedata(void *data) 3536 { 3537 struct nfs4_closedata *calldata = data; 3538 struct nfs4_state_owner *sp = calldata->state->owner; 3539 struct super_block *sb = calldata->state->inode->i_sb; 3540 3541 if (calldata->lr.roc) 3542 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3543 calldata->res.lr_ret); 3544 nfs4_put_open_state(calldata->state); 3545 nfs_free_seqid(calldata->arg.seqid); 3546 nfs4_put_state_owner(sp); 3547 nfs_sb_deactive(sb); 3548 kfree(calldata); 3549 } 3550 3551 static void nfs4_close_done(struct rpc_task *task, void *data) 3552 { 3553 struct nfs4_closedata *calldata = data; 3554 struct nfs4_state *state = calldata->state; 3555 struct nfs_server *server = NFS_SERVER(calldata->inode); 3556 nfs4_stateid *res_stateid = NULL; 3557 struct nfs4_exception exception = { 3558 .state = state, 3559 .inode = calldata->inode, 3560 .stateid = &calldata->arg.stateid, 3561 }; 3562 3563 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3564 return; 3565 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3566 3567 /* Handle Layoutreturn errors */ 3568 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3569 &calldata->res.lr_ret) == -EAGAIN) 3570 goto out_restart; 3571 3572 /* hmm. we are done with the inode, and in the process of freeing 3573 * the state_owner. we keep this around to process errors 3574 */ 3575 switch (task->tk_status) { 3576 case 0: 3577 res_stateid = &calldata->res.stateid; 3578 renew_lease(server, calldata->timestamp); 3579 break; 3580 case -NFS4ERR_ACCESS: 3581 if (calldata->arg.bitmask != NULL) { 3582 calldata->arg.bitmask = NULL; 3583 calldata->res.fattr = NULL; 3584 goto out_restart; 3585 3586 } 3587 break; 3588 case -NFS4ERR_OLD_STATEID: 3589 /* Did we race with OPEN? */ 3590 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3591 state)) 3592 goto out_restart; 3593 goto out_release; 3594 case -NFS4ERR_ADMIN_REVOKED: 3595 case -NFS4ERR_STALE_STATEID: 3596 case -NFS4ERR_EXPIRED: 3597 nfs4_free_revoked_stateid(server, 3598 &calldata->arg.stateid, 3599 task->tk_msg.rpc_cred); 3600 fallthrough; 3601 case -NFS4ERR_BAD_STATEID: 3602 if (calldata->arg.fmode == 0) 3603 break; 3604 fallthrough; 3605 default: 3606 task->tk_status = nfs4_async_handle_exception(task, 3607 server, task->tk_status, &exception); 3608 if (exception.retry) 3609 goto out_restart; 3610 } 3611 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3612 res_stateid, calldata->arg.fmode); 3613 out_release: 3614 task->tk_status = 0; 3615 nfs_release_seqid(calldata->arg.seqid); 3616 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3617 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3618 return; 3619 out_restart: 3620 task->tk_status = 0; 3621 rpc_restart_call_prepare(task); 3622 goto out_release; 3623 } 3624 3625 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3626 { 3627 struct nfs4_closedata *calldata = data; 3628 struct nfs4_state *state = calldata->state; 3629 struct inode *inode = calldata->inode; 3630 struct nfs_server *server = NFS_SERVER(inode); 3631 struct pnfs_layout_hdr *lo; 3632 bool is_rdonly, is_wronly, is_rdwr; 3633 int call_close = 0; 3634 3635 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3636 goto out_wait; 3637 3638 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3639 spin_lock(&state->owner->so_lock); 3640 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3641 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3642 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3643 /* Calculate the change in open mode */ 3644 calldata->arg.fmode = 0; 3645 if (state->n_rdwr == 0) { 3646 if (state->n_rdonly == 0) 3647 call_close |= is_rdonly; 3648 else if (is_rdonly) 3649 calldata->arg.fmode |= FMODE_READ; 3650 if (state->n_wronly == 0) 3651 call_close |= is_wronly; 3652 else if (is_wronly) 3653 calldata->arg.fmode |= FMODE_WRITE; 3654 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3655 call_close |= is_rdwr; 3656 } else if (is_rdwr) 3657 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3658 3659 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3660 if (!nfs4_valid_open_stateid(state)) 3661 call_close = 0; 3662 spin_unlock(&state->owner->so_lock); 3663 3664 if (!call_close) { 3665 /* Note: exit _without_ calling nfs4_close_done */ 3666 goto out_no_action; 3667 } 3668 3669 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3670 nfs_release_seqid(calldata->arg.seqid); 3671 goto out_wait; 3672 } 3673 3674 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3675 if (lo && !pnfs_layout_is_valid(lo)) { 3676 calldata->arg.lr_args = NULL; 3677 calldata->res.lr_res = NULL; 3678 } 3679 3680 if (calldata->arg.fmode == 0) 3681 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3682 3683 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3684 /* Close-to-open cache consistency revalidation */ 3685 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3686 nfs4_bitmask_set(calldata->arg.bitmask_store, 3687 server->cache_consistency_bitmask, 3688 inode, 0); 3689 calldata->arg.bitmask = calldata->arg.bitmask_store; 3690 } else 3691 calldata->arg.bitmask = NULL; 3692 } 3693 3694 calldata->arg.share_access = 3695 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3696 calldata->arg.fmode, 0); 3697 3698 if (calldata->res.fattr == NULL) 3699 calldata->arg.bitmask = NULL; 3700 else if (calldata->arg.bitmask == NULL) 3701 calldata->res.fattr = NULL; 3702 calldata->timestamp = jiffies; 3703 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3704 &calldata->arg.seq_args, 3705 &calldata->res.seq_res, 3706 task) != 0) 3707 nfs_release_seqid(calldata->arg.seqid); 3708 return; 3709 out_no_action: 3710 task->tk_action = NULL; 3711 out_wait: 3712 nfs4_sequence_done(task, &calldata->res.seq_res); 3713 } 3714 3715 static const struct rpc_call_ops nfs4_close_ops = { 3716 .rpc_call_prepare = nfs4_close_prepare, 3717 .rpc_call_done = nfs4_close_done, 3718 .rpc_release = nfs4_free_closedata, 3719 }; 3720 3721 /* 3722 * It is possible for data to be read/written from a mem-mapped file 3723 * after the sys_close call (which hits the vfs layer as a flush). 3724 * This means that we can't safely call nfsv4 close on a file until 3725 * the inode is cleared. This in turn means that we are not good 3726 * NFSv4 citizens - we do not indicate to the server to update the file's 3727 * share state even when we are done with one of the three share 3728 * stateid's in the inode. 3729 * 3730 * NOTE: Caller must be holding the sp->so_owner semaphore! 3731 */ 3732 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3733 { 3734 struct nfs_server *server = NFS_SERVER(state->inode); 3735 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3736 struct nfs4_closedata *calldata; 3737 struct nfs4_state_owner *sp = state->owner; 3738 struct rpc_task *task; 3739 struct rpc_message msg = { 3740 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3741 .rpc_cred = state->owner->so_cred, 3742 }; 3743 struct rpc_task_setup task_setup_data = { 3744 .rpc_client = server->client, 3745 .rpc_message = &msg, 3746 .callback_ops = &nfs4_close_ops, 3747 .workqueue = nfsiod_workqueue, 3748 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3749 }; 3750 int status = -ENOMEM; 3751 3752 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3753 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3754 3755 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3756 &task_setup_data.rpc_client, &msg); 3757 3758 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3759 if (calldata == NULL) 3760 goto out; 3761 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3762 calldata->inode = state->inode; 3763 calldata->state = state; 3764 calldata->arg.fh = NFS_FH(state->inode); 3765 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3766 goto out_free_calldata; 3767 /* Serialization for the sequence id */ 3768 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3769 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3770 if (IS_ERR(calldata->arg.seqid)) 3771 goto out_free_calldata; 3772 nfs_fattr_init(&calldata->fattr); 3773 calldata->arg.fmode = 0; 3774 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3775 calldata->res.fattr = &calldata->fattr; 3776 calldata->res.seqid = calldata->arg.seqid; 3777 calldata->res.server = server; 3778 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3779 calldata->lr.roc = pnfs_roc(state->inode, 3780 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3781 if (calldata->lr.roc) { 3782 calldata->arg.lr_args = &calldata->lr.arg; 3783 calldata->res.lr_res = &calldata->lr.res; 3784 } 3785 nfs_sb_active(calldata->inode->i_sb); 3786 3787 msg.rpc_argp = &calldata->arg; 3788 msg.rpc_resp = &calldata->res; 3789 task_setup_data.callback_data = calldata; 3790 task = rpc_run_task(&task_setup_data); 3791 if (IS_ERR(task)) 3792 return PTR_ERR(task); 3793 status = 0; 3794 if (wait) 3795 status = rpc_wait_for_completion_task(task); 3796 rpc_put_task(task); 3797 return status; 3798 out_free_calldata: 3799 kfree(calldata); 3800 out: 3801 nfs4_put_open_state(state); 3802 nfs4_put_state_owner(sp); 3803 return status; 3804 } 3805 3806 static struct inode * 3807 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3808 int open_flags, struct iattr *attr, int *opened) 3809 { 3810 struct nfs4_state *state; 3811 struct nfs4_label l, *label; 3812 3813 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3814 3815 /* Protect against concurrent sillydeletes */ 3816 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3817 3818 nfs4_label_release_security(label); 3819 3820 if (IS_ERR(state)) 3821 return ERR_CAST(state); 3822 return state->inode; 3823 } 3824 3825 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3826 { 3827 if (ctx->state == NULL) 3828 return; 3829 if (is_sync) 3830 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3831 else 3832 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3833 } 3834 3835 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3836 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3837 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3838 3839 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3840 { 3841 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3842 struct nfs4_server_caps_arg args = { 3843 .fhandle = fhandle, 3844 .bitmask = bitmask, 3845 }; 3846 struct nfs4_server_caps_res res = {}; 3847 struct rpc_message msg = { 3848 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3849 .rpc_argp = &args, 3850 .rpc_resp = &res, 3851 }; 3852 int status; 3853 int i; 3854 3855 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3856 FATTR4_WORD0_FH_EXPIRE_TYPE | 3857 FATTR4_WORD0_LINK_SUPPORT | 3858 FATTR4_WORD0_SYMLINK_SUPPORT | 3859 FATTR4_WORD0_ACLSUPPORT | 3860 FATTR4_WORD0_CASE_INSENSITIVE | 3861 FATTR4_WORD0_CASE_PRESERVING; 3862 if (minorversion) 3863 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3864 3865 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3866 if (status == 0) { 3867 /* Sanity check the server answers */ 3868 switch (minorversion) { 3869 case 0: 3870 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3871 res.attr_bitmask[2] = 0; 3872 break; 3873 case 1: 3874 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3875 break; 3876 case 2: 3877 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3878 } 3879 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3880 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3881 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3882 server->fattr_valid = NFS_ATTR_FATTR_V4; 3883 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3884 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3885 server->caps |= NFS_CAP_ACLS; 3886 if (res.has_links != 0) 3887 server->caps |= NFS_CAP_HARDLINKS; 3888 if (res.has_symlinks != 0) 3889 server->caps |= NFS_CAP_SYMLINKS; 3890 if (res.case_insensitive) 3891 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3892 if (res.case_preserving) 3893 server->caps |= NFS_CAP_CASE_PRESERVING; 3894 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3895 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3896 server->caps |= NFS_CAP_SECURITY_LABEL; 3897 #endif 3898 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3899 server->caps |= NFS_CAP_FS_LOCATIONS; 3900 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3901 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3902 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3903 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3905 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3906 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3907 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3908 NFS_ATTR_FATTR_OWNER_NAME); 3909 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3910 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3911 NFS_ATTR_FATTR_GROUP_NAME); 3912 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3913 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3914 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3915 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3916 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3917 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3918 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3919 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3920 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3921 sizeof(server->attr_bitmask)); 3922 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3923 3924 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3925 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3926 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3927 server->cache_consistency_bitmask[2] = 0; 3928 3929 /* Avoid a regression due to buggy server */ 3930 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3931 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3932 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3933 sizeof(server->exclcreat_bitmask)); 3934 3935 server->acl_bitmask = res.acl_bitmask; 3936 server->fh_expire_type = res.fh_expire_type; 3937 } 3938 3939 return status; 3940 } 3941 3942 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3943 { 3944 struct nfs4_exception exception = { 3945 .interruptible = true, 3946 }; 3947 int err; 3948 3949 nfs4_server_set_init_caps(server); 3950 do { 3951 err = nfs4_handle_exception(server, 3952 _nfs4_server_capabilities(server, fhandle), 3953 &exception); 3954 } while (exception.retry); 3955 return err; 3956 } 3957 3958 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3959 struct nfs_client *clp, 3960 struct nfs_server *server) 3961 { 3962 int i; 3963 3964 for (i = 0; i < location->nservers; i++) { 3965 struct nfs4_string *srv_loc = &location->servers[i]; 3966 struct sockaddr_storage addr; 3967 size_t addrlen; 3968 struct xprt_create xprt_args = { 3969 .ident = 0, 3970 .net = clp->cl_net, 3971 }; 3972 struct nfs4_add_xprt_data xprtdata = { 3973 .clp = clp, 3974 }; 3975 struct rpc_add_xprt_test rpcdata = { 3976 .add_xprt_test = clp->cl_mvops->session_trunk, 3977 .data = &xprtdata, 3978 }; 3979 char *servername = NULL; 3980 3981 if (!srv_loc->len) 3982 continue; 3983 3984 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3985 &addr, sizeof(addr), 3986 clp->cl_net, server->port); 3987 if (!addrlen) 3988 return; 3989 xprt_args.dstaddr = (struct sockaddr *)&addr; 3990 xprt_args.addrlen = addrlen; 3991 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3992 if (!servername) 3993 return; 3994 memcpy(servername, srv_loc->data, srv_loc->len); 3995 servername[srv_loc->len] = '\0'; 3996 xprt_args.servername = servername; 3997 3998 xprtdata.cred = nfs4_get_clid_cred(clp); 3999 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 4000 rpc_clnt_setup_test_and_add_xprt, 4001 &rpcdata); 4002 if (xprtdata.cred) 4003 put_cred(xprtdata.cred); 4004 kfree(servername); 4005 } 4006 } 4007 4008 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1, 4009 struct nfs4_pathname *path2) 4010 { 4011 int i; 4012 4013 if (path1->ncomponents != path2->ncomponents) 4014 return false; 4015 for (i = 0; i < path1->ncomponents; i++) { 4016 if (path1->components[i].len != path2->components[i].len) 4017 return false; 4018 if (memcmp(path1->components[i].data, path2->components[i].data, 4019 path1->components[i].len)) 4020 return false; 4021 } 4022 return true; 4023 } 4024 4025 static int _nfs4_discover_trunking(struct nfs_server *server, 4026 struct nfs_fh *fhandle) 4027 { 4028 struct nfs4_fs_locations *locations = NULL; 4029 struct page *page; 4030 const struct cred *cred; 4031 struct nfs_client *clp = server->nfs_client; 4032 const struct nfs4_state_maintenance_ops *ops = 4033 clp->cl_mvops->state_renewal_ops; 4034 int status = -ENOMEM, i; 4035 4036 cred = ops->get_state_renewal_cred(clp); 4037 if (cred == NULL) { 4038 cred = nfs4_get_clid_cred(clp); 4039 if (cred == NULL) 4040 return -ENOKEY; 4041 } 4042 4043 page = alloc_page(GFP_KERNEL); 4044 if (!page) 4045 goto out_put_cred; 4046 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4047 if (!locations) 4048 goto out_free; 4049 locations->fattr = nfs_alloc_fattr(); 4050 if (!locations->fattr) 4051 goto out_free_2; 4052 4053 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4054 cred); 4055 if (status) 4056 goto out_free_3; 4057 4058 for (i = 0; i < locations->nlocations; i++) { 4059 if (!_is_same_nfs4_pathname(&locations->fs_path, 4060 &locations->locations[i].rootpath)) 4061 continue; 4062 test_fs_location_for_trunking(&locations->locations[i], clp, 4063 server); 4064 } 4065 out_free_3: 4066 kfree(locations->fattr); 4067 out_free_2: 4068 kfree(locations); 4069 out_free: 4070 __free_page(page); 4071 out_put_cred: 4072 put_cred(cred); 4073 return status; 4074 } 4075 4076 static int nfs4_discover_trunking(struct nfs_server *server, 4077 struct nfs_fh *fhandle) 4078 { 4079 struct nfs4_exception exception = { 4080 .interruptible = true, 4081 }; 4082 struct nfs_client *clp = server->nfs_client; 4083 int err = 0; 4084 4085 if (!nfs4_has_session(clp)) 4086 goto out; 4087 do { 4088 err = nfs4_handle_exception(server, 4089 _nfs4_discover_trunking(server, fhandle), 4090 &exception); 4091 } while (exception.retry); 4092 out: 4093 return err; 4094 } 4095 4096 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4097 struct nfs_fsinfo *info) 4098 { 4099 u32 bitmask[3]; 4100 struct nfs4_lookup_root_arg args = { 4101 .bitmask = bitmask, 4102 }; 4103 struct nfs4_lookup_res res = { 4104 .server = server, 4105 .fattr = info->fattr, 4106 .fh = fhandle, 4107 }; 4108 struct rpc_message msg = { 4109 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4110 .rpc_argp = &args, 4111 .rpc_resp = &res, 4112 }; 4113 4114 bitmask[0] = nfs4_fattr_bitmap[0]; 4115 bitmask[1] = nfs4_fattr_bitmap[1]; 4116 /* 4117 * Process the label in the upcoming getfattr 4118 */ 4119 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4120 4121 nfs_fattr_init(info->fattr); 4122 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4123 } 4124 4125 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4126 struct nfs_fsinfo *info) 4127 { 4128 struct nfs4_exception exception = { 4129 .interruptible = true, 4130 }; 4131 int err; 4132 do { 4133 err = _nfs4_lookup_root(server, fhandle, info); 4134 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4135 switch (err) { 4136 case 0: 4137 case -NFS4ERR_WRONGSEC: 4138 goto out; 4139 default: 4140 err = nfs4_handle_exception(server, err, &exception); 4141 } 4142 } while (exception.retry); 4143 out: 4144 return err; 4145 } 4146 4147 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4148 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4149 { 4150 struct rpc_auth_create_args auth_args = { 4151 .pseudoflavor = flavor, 4152 }; 4153 struct rpc_auth *auth; 4154 4155 auth = rpcauth_create(&auth_args, server->client); 4156 if (IS_ERR(auth)) 4157 return -EACCES; 4158 return nfs4_lookup_root(server, fhandle, info); 4159 } 4160 4161 /* 4162 * Retry pseudoroot lookup with various security flavors. We do this when: 4163 * 4164 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4165 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4166 * 4167 * Returns zero on success, or a negative NFS4ERR value, or a 4168 * negative errno value. 4169 */ 4170 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4171 struct nfs_fsinfo *info) 4172 { 4173 /* Per 3530bis 15.33.5 */ 4174 static const rpc_authflavor_t flav_array[] = { 4175 RPC_AUTH_GSS_KRB5P, 4176 RPC_AUTH_GSS_KRB5I, 4177 RPC_AUTH_GSS_KRB5, 4178 RPC_AUTH_UNIX, /* courtesy */ 4179 RPC_AUTH_NULL, 4180 }; 4181 int status = -EPERM; 4182 size_t i; 4183 4184 if (server->auth_info.flavor_len > 0) { 4185 /* try each flavor specified by user */ 4186 for (i = 0; i < server->auth_info.flavor_len; i++) { 4187 status = nfs4_lookup_root_sec(server, fhandle, info, 4188 server->auth_info.flavors[i]); 4189 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4190 continue; 4191 break; 4192 } 4193 } else { 4194 /* no flavors specified by user, try default list */ 4195 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4196 status = nfs4_lookup_root_sec(server, fhandle, info, 4197 flav_array[i]); 4198 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4199 continue; 4200 break; 4201 } 4202 } 4203 4204 /* 4205 * -EACCES could mean that the user doesn't have correct permissions 4206 * to access the mount. It could also mean that we tried to mount 4207 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4208 * existing mount programs don't handle -EACCES very well so it should 4209 * be mapped to -EPERM instead. 4210 */ 4211 if (status == -EACCES) 4212 status = -EPERM; 4213 return status; 4214 } 4215 4216 /** 4217 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4218 * @server: initialized nfs_server handle 4219 * @fhandle: we fill in the pseudo-fs root file handle 4220 * @info: we fill in an FSINFO struct 4221 * @auth_probe: probe the auth flavours 4222 * 4223 * Returns zero on success, or a negative errno. 4224 */ 4225 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4226 struct nfs_fsinfo *info, 4227 bool auth_probe) 4228 { 4229 int status = 0; 4230 4231 if (!auth_probe) 4232 status = nfs4_lookup_root(server, fhandle, info); 4233 4234 if (auth_probe || status == NFS4ERR_WRONGSEC) 4235 status = server->nfs_client->cl_mvops->find_root_sec(server, 4236 fhandle, info); 4237 4238 if (status == 0) 4239 status = nfs4_server_capabilities(server, fhandle); 4240 if (status == 0) 4241 status = nfs4_do_fsinfo(server, fhandle, info); 4242 4243 return nfs4_map_errors(status); 4244 } 4245 4246 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4247 struct nfs_fsinfo *info) 4248 { 4249 int error; 4250 struct nfs_fattr *fattr = info->fattr; 4251 4252 error = nfs4_server_capabilities(server, mntfh); 4253 if (error < 0) { 4254 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4255 return error; 4256 } 4257 4258 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4259 if (error < 0) { 4260 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4261 goto out; 4262 } 4263 4264 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4265 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4266 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4267 4268 out: 4269 return error; 4270 } 4271 4272 /* 4273 * Get locations and (maybe) other attributes of a referral. 4274 * Note that we'll actually follow the referral later when 4275 * we detect fsid mismatch in inode revalidation 4276 */ 4277 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4278 const struct qstr *name, struct nfs_fattr *fattr, 4279 struct nfs_fh *fhandle) 4280 { 4281 int status = -ENOMEM; 4282 struct page *page = NULL; 4283 struct nfs4_fs_locations *locations = NULL; 4284 4285 page = alloc_page(GFP_KERNEL); 4286 if (page == NULL) 4287 goto out; 4288 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4289 if (locations == NULL) 4290 goto out; 4291 4292 locations->fattr = fattr; 4293 4294 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4295 if (status != 0) 4296 goto out; 4297 4298 /* 4299 * If the fsid didn't change, this is a migration event, not a 4300 * referral. Cause us to drop into the exception handler, which 4301 * will kick off migration recovery. 4302 */ 4303 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4304 dprintk("%s: server did not return a different fsid for" 4305 " a referral at %s\n", __func__, name->name); 4306 status = -NFS4ERR_MOVED; 4307 goto out; 4308 } 4309 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4310 nfs_fixup_referral_attributes(fattr); 4311 memset(fhandle, 0, sizeof(struct nfs_fh)); 4312 out: 4313 if (page) 4314 __free_page(page); 4315 kfree(locations); 4316 return status; 4317 } 4318 4319 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4320 struct nfs_fattr *fattr, struct inode *inode) 4321 { 4322 __u32 bitmask[NFS4_BITMASK_SZ]; 4323 struct nfs4_getattr_arg args = { 4324 .fh = fhandle, 4325 .bitmask = bitmask, 4326 }; 4327 struct nfs4_getattr_res res = { 4328 .fattr = fattr, 4329 .server = server, 4330 }; 4331 struct rpc_message msg = { 4332 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4333 .rpc_argp = &args, 4334 .rpc_resp = &res, 4335 }; 4336 unsigned short task_flags = 0; 4337 4338 if (nfs4_has_session(server->nfs_client)) 4339 task_flags = RPC_TASK_MOVEABLE; 4340 4341 /* Is this is an attribute revalidation, subject to softreval? */ 4342 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4343 task_flags |= RPC_TASK_TIMEOUT; 4344 4345 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4346 nfs_fattr_init(fattr); 4347 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4348 return nfs4_do_call_sync(server->client, server, &msg, 4349 &args.seq_args, &res.seq_res, task_flags); 4350 } 4351 4352 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4353 struct nfs_fattr *fattr, struct inode *inode) 4354 { 4355 struct nfs4_exception exception = { 4356 .interruptible = true, 4357 }; 4358 int err; 4359 do { 4360 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4361 trace_nfs4_getattr(server, fhandle, fattr, err); 4362 err = nfs4_handle_exception(server, err, 4363 &exception); 4364 } while (exception.retry); 4365 return err; 4366 } 4367 4368 /* 4369 * The file is not closed if it is opened due to the a request to change 4370 * the size of the file. The open call will not be needed once the 4371 * VFS layer lookup-intents are implemented. 4372 * 4373 * Close is called when the inode is destroyed. 4374 * If we haven't opened the file for O_WRONLY, we 4375 * need to in the size_change case to obtain a stateid. 4376 * 4377 * Got race? 4378 * Because OPEN is always done by name in nfsv4, it is 4379 * possible that we opened a different file by the same 4380 * name. We can recognize this race condition, but we 4381 * can't do anything about it besides returning an error. 4382 * 4383 * This will be fixed with VFS changes (lookup-intent). 4384 */ 4385 static int 4386 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4387 struct iattr *sattr) 4388 { 4389 struct inode *inode = d_inode(dentry); 4390 const struct cred *cred = NULL; 4391 struct nfs_open_context *ctx = NULL; 4392 int status; 4393 4394 if (pnfs_ld_layoutret_on_setattr(inode) && 4395 sattr->ia_valid & ATTR_SIZE && 4396 sattr->ia_size < i_size_read(inode)) 4397 pnfs_commit_and_return_layout(inode); 4398 4399 nfs_fattr_init(fattr); 4400 4401 /* Deal with open(O_TRUNC) */ 4402 if (sattr->ia_valid & ATTR_OPEN) 4403 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4404 4405 /* Optimization: if the end result is no change, don't RPC */ 4406 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4407 return 0; 4408 4409 /* Search for an existing open(O_WRITE) file */ 4410 if (sattr->ia_valid & ATTR_FILE) { 4411 4412 ctx = nfs_file_open_context(sattr->ia_file); 4413 if (ctx) 4414 cred = ctx->cred; 4415 } 4416 4417 /* Return any delegations if we're going to change ACLs */ 4418 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4419 nfs4_inode_make_writeable(inode); 4420 4421 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4422 if (status == 0) { 4423 nfs_setattr_update_inode(inode, sattr, fattr); 4424 nfs_setsecurity(inode, fattr); 4425 } 4426 return status; 4427 } 4428 4429 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4430 struct dentry *dentry, struct nfs_fh *fhandle, 4431 struct nfs_fattr *fattr) 4432 { 4433 struct nfs_server *server = NFS_SERVER(dir); 4434 int status; 4435 struct nfs4_lookup_arg args = { 4436 .bitmask = server->attr_bitmask, 4437 .dir_fh = NFS_FH(dir), 4438 .name = &dentry->d_name, 4439 }; 4440 struct nfs4_lookup_res res = { 4441 .server = server, 4442 .fattr = fattr, 4443 .fh = fhandle, 4444 }; 4445 struct rpc_message msg = { 4446 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4447 .rpc_argp = &args, 4448 .rpc_resp = &res, 4449 }; 4450 unsigned short task_flags = 0; 4451 4452 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4453 task_flags = RPC_TASK_MOVEABLE; 4454 4455 /* Is this is an attribute revalidation, subject to softreval? */ 4456 if (nfs_lookup_is_soft_revalidate(dentry)) 4457 task_flags |= RPC_TASK_TIMEOUT; 4458 4459 args.bitmask = nfs4_bitmask(server, fattr->label); 4460 4461 nfs_fattr_init(fattr); 4462 4463 dprintk("NFS call lookup %pd2\n", dentry); 4464 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4465 status = nfs4_do_call_sync(clnt, server, &msg, 4466 &args.seq_args, &res.seq_res, task_flags); 4467 dprintk("NFS reply lookup: %d\n", status); 4468 return status; 4469 } 4470 4471 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4472 { 4473 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4474 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4475 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4476 fattr->nlink = 2; 4477 } 4478 4479 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4480 struct dentry *dentry, struct nfs_fh *fhandle, 4481 struct nfs_fattr *fattr) 4482 { 4483 struct nfs4_exception exception = { 4484 .interruptible = true, 4485 }; 4486 struct rpc_clnt *client = *clnt; 4487 const struct qstr *name = &dentry->d_name; 4488 int err; 4489 do { 4490 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4491 trace_nfs4_lookup(dir, name, err); 4492 switch (err) { 4493 case -NFS4ERR_BADNAME: 4494 err = -ENOENT; 4495 goto out; 4496 case -NFS4ERR_MOVED: 4497 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4498 if (err == -NFS4ERR_MOVED) 4499 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4500 goto out; 4501 case -NFS4ERR_WRONGSEC: 4502 err = -EPERM; 4503 if (client != *clnt) 4504 goto out; 4505 client = nfs4_negotiate_security(client, dir, name); 4506 if (IS_ERR(client)) 4507 return PTR_ERR(client); 4508 4509 exception.retry = 1; 4510 break; 4511 default: 4512 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4513 } 4514 } while (exception.retry); 4515 4516 out: 4517 if (err == 0) 4518 *clnt = client; 4519 else if (client != *clnt) 4520 rpc_shutdown_client(client); 4521 4522 return err; 4523 } 4524 4525 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4526 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4527 { 4528 int status; 4529 struct rpc_clnt *client = NFS_CLIENT(dir); 4530 4531 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4532 if (client != NFS_CLIENT(dir)) { 4533 rpc_shutdown_client(client); 4534 nfs_fixup_secinfo_attributes(fattr); 4535 } 4536 return status; 4537 } 4538 4539 struct rpc_clnt * 4540 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4541 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4542 { 4543 struct rpc_clnt *client = NFS_CLIENT(dir); 4544 int status; 4545 4546 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4547 if (status < 0) 4548 return ERR_PTR(status); 4549 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4550 } 4551 4552 static int _nfs4_proc_lookupp(struct inode *inode, 4553 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4554 { 4555 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4556 struct nfs_server *server = NFS_SERVER(inode); 4557 int status; 4558 struct nfs4_lookupp_arg args = { 4559 .bitmask = server->attr_bitmask, 4560 .fh = NFS_FH(inode), 4561 }; 4562 struct nfs4_lookupp_res res = { 4563 .server = server, 4564 .fattr = fattr, 4565 .fh = fhandle, 4566 }; 4567 struct rpc_message msg = { 4568 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4569 .rpc_argp = &args, 4570 .rpc_resp = &res, 4571 }; 4572 unsigned short task_flags = 0; 4573 4574 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4575 task_flags |= RPC_TASK_TIMEOUT; 4576 4577 args.bitmask = nfs4_bitmask(server, fattr->label); 4578 4579 nfs_fattr_init(fattr); 4580 4581 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4582 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4583 &res.seq_res, task_flags); 4584 dprintk("NFS reply lookupp: %d\n", status); 4585 return status; 4586 } 4587 4588 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4589 struct nfs_fattr *fattr) 4590 { 4591 struct nfs4_exception exception = { 4592 .interruptible = true, 4593 }; 4594 int err; 4595 do { 4596 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4597 trace_nfs4_lookupp(inode, err); 4598 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4599 &exception); 4600 } while (exception.retry); 4601 return err; 4602 } 4603 4604 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4605 const struct cred *cred) 4606 { 4607 struct nfs_server *server = NFS_SERVER(inode); 4608 struct nfs4_accessargs args = { 4609 .fh = NFS_FH(inode), 4610 .access = entry->mask, 4611 }; 4612 struct nfs4_accessres res = { 4613 .server = server, 4614 }; 4615 struct rpc_message msg = { 4616 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4617 .rpc_argp = &args, 4618 .rpc_resp = &res, 4619 .rpc_cred = cred, 4620 }; 4621 int status = 0; 4622 4623 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4624 res.fattr = nfs_alloc_fattr(); 4625 if (res.fattr == NULL) 4626 return -ENOMEM; 4627 args.bitmask = server->cache_consistency_bitmask; 4628 } 4629 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4630 if (!status) { 4631 nfs_access_set_mask(entry, res.access); 4632 if (res.fattr) 4633 nfs_refresh_inode(inode, res.fattr); 4634 } 4635 nfs_free_fattr(res.fattr); 4636 return status; 4637 } 4638 4639 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4640 const struct cred *cred) 4641 { 4642 struct nfs4_exception exception = { 4643 .interruptible = true, 4644 }; 4645 int err; 4646 do { 4647 err = _nfs4_proc_access(inode, entry, cred); 4648 trace_nfs4_access(inode, err); 4649 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4650 &exception); 4651 } while (exception.retry); 4652 return err; 4653 } 4654 4655 /* 4656 * TODO: For the time being, we don't try to get any attributes 4657 * along with any of the zero-copy operations READ, READDIR, 4658 * READLINK, WRITE. 4659 * 4660 * In the case of the first three, we want to put the GETATTR 4661 * after the read-type operation -- this is because it is hard 4662 * to predict the length of a GETATTR response in v4, and thus 4663 * align the READ data correctly. This means that the GETATTR 4664 * may end up partially falling into the page cache, and we should 4665 * shift it into the 'tail' of the xdr_buf before processing. 4666 * To do this efficiently, we need to know the total length 4667 * of data received, which doesn't seem to be available outside 4668 * of the RPC layer. 4669 * 4670 * In the case of WRITE, we also want to put the GETATTR after 4671 * the operation -- in this case because we want to make sure 4672 * we get the post-operation mtime and size. 4673 * 4674 * Both of these changes to the XDR layer would in fact be quite 4675 * minor, but I decided to leave them for a subsequent patch. 4676 */ 4677 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4678 unsigned int pgbase, unsigned int pglen) 4679 { 4680 struct nfs4_readlink args = { 4681 .fh = NFS_FH(inode), 4682 .pgbase = pgbase, 4683 .pglen = pglen, 4684 .pages = &page, 4685 }; 4686 struct nfs4_readlink_res res; 4687 struct rpc_message msg = { 4688 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4689 .rpc_argp = &args, 4690 .rpc_resp = &res, 4691 }; 4692 4693 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4694 } 4695 4696 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4697 unsigned int pgbase, unsigned int pglen) 4698 { 4699 struct nfs4_exception exception = { 4700 .interruptible = true, 4701 }; 4702 int err; 4703 do { 4704 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4705 trace_nfs4_readlink(inode, err); 4706 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4707 &exception); 4708 } while (exception.retry); 4709 return err; 4710 } 4711 4712 /* 4713 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4714 */ 4715 static int 4716 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4717 int flags) 4718 { 4719 struct nfs_server *server = NFS_SERVER(dir); 4720 struct nfs4_label l, *ilabel; 4721 struct nfs_open_context *ctx; 4722 struct nfs4_state *state; 4723 int status = 0; 4724 4725 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4726 if (IS_ERR(ctx)) 4727 return PTR_ERR(ctx); 4728 4729 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4730 4731 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4732 sattr->ia_mode &= ~current_umask(); 4733 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4734 if (IS_ERR(state)) { 4735 status = PTR_ERR(state); 4736 goto out; 4737 } 4738 out: 4739 nfs4_label_release_security(ilabel); 4740 put_nfs_open_context(ctx); 4741 return status; 4742 } 4743 4744 static int 4745 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4746 { 4747 struct nfs_server *server = NFS_SERVER(dir); 4748 struct nfs_removeargs args = { 4749 .fh = NFS_FH(dir), 4750 .name = *name, 4751 }; 4752 struct nfs_removeres res = { 4753 .server = server, 4754 }; 4755 struct rpc_message msg = { 4756 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4757 .rpc_argp = &args, 4758 .rpc_resp = &res, 4759 }; 4760 unsigned long timestamp = jiffies; 4761 int status; 4762 4763 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4764 if (status == 0) { 4765 spin_lock(&dir->i_lock); 4766 /* Removing a directory decrements nlink in the parent */ 4767 if (ftype == NF4DIR && dir->i_nlink > 2) 4768 nfs4_dec_nlink_locked(dir); 4769 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4770 NFS_INO_INVALID_DATA); 4771 spin_unlock(&dir->i_lock); 4772 } 4773 return status; 4774 } 4775 4776 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4777 { 4778 struct nfs4_exception exception = { 4779 .interruptible = true, 4780 }; 4781 struct inode *inode = d_inode(dentry); 4782 int err; 4783 4784 if (inode) { 4785 if (inode->i_nlink == 1) 4786 nfs4_inode_return_delegation(inode); 4787 else 4788 nfs4_inode_make_writeable(inode); 4789 } 4790 do { 4791 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4792 trace_nfs4_remove(dir, &dentry->d_name, err); 4793 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4794 &exception); 4795 } while (exception.retry); 4796 return err; 4797 } 4798 4799 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4800 { 4801 struct nfs4_exception exception = { 4802 .interruptible = true, 4803 }; 4804 int err; 4805 4806 do { 4807 err = _nfs4_proc_remove(dir, name, NF4DIR); 4808 trace_nfs4_remove(dir, name, err); 4809 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4810 &exception); 4811 } while (exception.retry); 4812 return err; 4813 } 4814 4815 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4816 struct dentry *dentry, 4817 struct inode *inode) 4818 { 4819 struct nfs_removeargs *args = msg->rpc_argp; 4820 struct nfs_removeres *res = msg->rpc_resp; 4821 4822 res->server = NFS_SB(dentry->d_sb); 4823 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4824 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4825 4826 nfs_fattr_init(res->dir_attr); 4827 4828 if (inode) { 4829 nfs4_inode_return_delegation(inode); 4830 nfs_d_prune_case_insensitive_aliases(inode); 4831 } 4832 } 4833 4834 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4835 { 4836 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4837 &data->args.seq_args, 4838 &data->res.seq_res, 4839 task); 4840 } 4841 4842 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4843 { 4844 struct nfs_unlinkdata *data = task->tk_calldata; 4845 struct nfs_removeres *res = &data->res; 4846 4847 if (!nfs4_sequence_done(task, &res->seq_res)) 4848 return 0; 4849 if (nfs4_async_handle_error(task, res->server, NULL, 4850 &data->timeout) == -EAGAIN) 4851 return 0; 4852 if (task->tk_status == 0) 4853 nfs4_update_changeattr(dir, &res->cinfo, 4854 res->dir_attr->time_start, 4855 NFS_INO_INVALID_DATA); 4856 return 1; 4857 } 4858 4859 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4860 struct dentry *old_dentry, 4861 struct dentry *new_dentry) 4862 { 4863 struct nfs_renameargs *arg = msg->rpc_argp; 4864 struct nfs_renameres *res = msg->rpc_resp; 4865 struct inode *old_inode = d_inode(old_dentry); 4866 struct inode *new_inode = d_inode(new_dentry); 4867 4868 if (old_inode) 4869 nfs4_inode_make_writeable(old_inode); 4870 if (new_inode) 4871 nfs4_inode_return_delegation(new_inode); 4872 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4873 res->server = NFS_SB(old_dentry->d_sb); 4874 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4875 } 4876 4877 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4878 { 4879 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4880 &data->args.seq_args, 4881 &data->res.seq_res, 4882 task); 4883 } 4884 4885 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4886 struct inode *new_dir) 4887 { 4888 struct nfs_renamedata *data = task->tk_calldata; 4889 struct nfs_renameres *res = &data->res; 4890 4891 if (!nfs4_sequence_done(task, &res->seq_res)) 4892 return 0; 4893 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4894 return 0; 4895 4896 if (task->tk_status == 0) { 4897 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4898 if (new_dir != old_dir) { 4899 /* Note: If we moved a directory, nlink will change */ 4900 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4901 res->old_fattr->time_start, 4902 NFS_INO_INVALID_NLINK | 4903 NFS_INO_INVALID_DATA); 4904 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4905 res->new_fattr->time_start, 4906 NFS_INO_INVALID_NLINK | 4907 NFS_INO_INVALID_DATA); 4908 } else 4909 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4910 res->old_fattr->time_start, 4911 NFS_INO_INVALID_DATA); 4912 } 4913 return 1; 4914 } 4915 4916 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4917 { 4918 struct nfs_server *server = NFS_SERVER(inode); 4919 __u32 bitmask[NFS4_BITMASK_SZ]; 4920 struct nfs4_link_arg arg = { 4921 .fh = NFS_FH(inode), 4922 .dir_fh = NFS_FH(dir), 4923 .name = name, 4924 .bitmask = bitmask, 4925 }; 4926 struct nfs4_link_res res = { 4927 .server = server, 4928 }; 4929 struct rpc_message msg = { 4930 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4931 .rpc_argp = &arg, 4932 .rpc_resp = &res, 4933 }; 4934 int status = -ENOMEM; 4935 4936 res.fattr = nfs_alloc_fattr_with_label(server); 4937 if (res.fattr == NULL) 4938 goto out; 4939 4940 nfs4_inode_make_writeable(inode); 4941 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4942 NFS_INO_INVALID_CHANGE); 4943 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4944 if (!status) { 4945 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4946 NFS_INO_INVALID_DATA); 4947 nfs4_inc_nlink(inode); 4948 status = nfs_post_op_update_inode(inode, res.fattr); 4949 if (!status) 4950 nfs_setsecurity(inode, res.fattr); 4951 } 4952 4953 out: 4954 nfs_free_fattr(res.fattr); 4955 return status; 4956 } 4957 4958 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4959 { 4960 struct nfs4_exception exception = { 4961 .interruptible = true, 4962 }; 4963 int err; 4964 do { 4965 err = nfs4_handle_exception(NFS_SERVER(inode), 4966 _nfs4_proc_link(inode, dir, name), 4967 &exception); 4968 } while (exception.retry); 4969 return err; 4970 } 4971 4972 struct nfs4_createdata { 4973 struct rpc_message msg; 4974 struct nfs4_create_arg arg; 4975 struct nfs4_create_res res; 4976 struct nfs_fh fh; 4977 struct nfs_fattr fattr; 4978 }; 4979 4980 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4981 const struct qstr *name, struct iattr *sattr, u32 ftype) 4982 { 4983 struct nfs4_createdata *data; 4984 4985 data = kzalloc(sizeof(*data), GFP_KERNEL); 4986 if (data != NULL) { 4987 struct nfs_server *server = NFS_SERVER(dir); 4988 4989 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4990 if (IS_ERR(data->fattr.label)) 4991 goto out_free; 4992 4993 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4994 data->msg.rpc_argp = &data->arg; 4995 data->msg.rpc_resp = &data->res; 4996 data->arg.dir_fh = NFS_FH(dir); 4997 data->arg.server = server; 4998 data->arg.name = name; 4999 data->arg.attrs = sattr; 5000 data->arg.ftype = ftype; 5001 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 5002 data->arg.umask = current_umask(); 5003 data->res.server = server; 5004 data->res.fh = &data->fh; 5005 data->res.fattr = &data->fattr; 5006 nfs_fattr_init(data->res.fattr); 5007 } 5008 return data; 5009 out_free: 5010 kfree(data); 5011 return NULL; 5012 } 5013 5014 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 5015 { 5016 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 5017 &data->arg.seq_args, &data->res.seq_res, 1); 5018 if (status == 0) { 5019 spin_lock(&dir->i_lock); 5020 /* Creating a directory bumps nlink in the parent */ 5021 if (data->arg.ftype == NF4DIR) 5022 nfs4_inc_nlink_locked(dir); 5023 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 5024 data->res.fattr->time_start, 5025 NFS_INO_INVALID_DATA); 5026 spin_unlock(&dir->i_lock); 5027 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5028 } 5029 return status; 5030 } 5031 5032 static void nfs4_free_createdata(struct nfs4_createdata *data) 5033 { 5034 nfs4_label_free(data->fattr.label); 5035 kfree(data); 5036 } 5037 5038 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5039 struct page *page, unsigned int len, struct iattr *sattr, 5040 struct nfs4_label *label) 5041 { 5042 struct nfs4_createdata *data; 5043 int status = -ENAMETOOLONG; 5044 5045 if (len > NFS4_MAXPATHLEN) 5046 goto out; 5047 5048 status = -ENOMEM; 5049 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5050 if (data == NULL) 5051 goto out; 5052 5053 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5054 data->arg.u.symlink.pages = &page; 5055 data->arg.u.symlink.len = len; 5056 data->arg.label = label; 5057 5058 status = nfs4_do_create(dir, dentry, data); 5059 5060 nfs4_free_createdata(data); 5061 out: 5062 return status; 5063 } 5064 5065 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5066 struct page *page, unsigned int len, struct iattr *sattr) 5067 { 5068 struct nfs4_exception exception = { 5069 .interruptible = true, 5070 }; 5071 struct nfs4_label l, *label; 5072 int err; 5073 5074 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5075 5076 do { 5077 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5078 trace_nfs4_symlink(dir, &dentry->d_name, err); 5079 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5080 &exception); 5081 } while (exception.retry); 5082 5083 nfs4_label_release_security(label); 5084 return err; 5085 } 5086 5087 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5088 struct iattr *sattr, struct nfs4_label *label) 5089 { 5090 struct nfs4_createdata *data; 5091 int status = -ENOMEM; 5092 5093 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5094 if (data == NULL) 5095 goto out; 5096 5097 data->arg.label = label; 5098 status = nfs4_do_create(dir, dentry, data); 5099 5100 nfs4_free_createdata(data); 5101 out: 5102 return status; 5103 } 5104 5105 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5106 struct iattr *sattr) 5107 { 5108 struct nfs_server *server = NFS_SERVER(dir); 5109 struct nfs4_exception exception = { 5110 .interruptible = true, 5111 }; 5112 struct nfs4_label l, *label; 5113 int err; 5114 5115 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5116 5117 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5118 sattr->ia_mode &= ~current_umask(); 5119 do { 5120 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5121 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5122 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5123 &exception); 5124 } while (exception.retry); 5125 nfs4_label_release_security(label); 5126 5127 return err; 5128 } 5129 5130 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5131 struct nfs_readdir_res *nr_res) 5132 { 5133 struct inode *dir = d_inode(nr_arg->dentry); 5134 struct nfs_server *server = NFS_SERVER(dir); 5135 struct nfs4_readdir_arg args = { 5136 .fh = NFS_FH(dir), 5137 .pages = nr_arg->pages, 5138 .pgbase = 0, 5139 .count = nr_arg->page_len, 5140 .plus = nr_arg->plus, 5141 }; 5142 struct nfs4_readdir_res res; 5143 struct rpc_message msg = { 5144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5145 .rpc_argp = &args, 5146 .rpc_resp = &res, 5147 .rpc_cred = nr_arg->cred, 5148 }; 5149 int status; 5150 5151 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5152 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5153 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5154 args.bitmask = server->attr_bitmask_nl; 5155 else 5156 args.bitmask = server->attr_bitmask; 5157 5158 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5159 res.pgbase = args.pgbase; 5160 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5161 &res.seq_res, 0); 5162 if (status >= 0) { 5163 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5164 status += args.pgbase; 5165 } 5166 5167 nfs_invalidate_atime(dir); 5168 5169 dprintk("%s: returns %d\n", __func__, status); 5170 return status; 5171 } 5172 5173 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5174 struct nfs_readdir_res *res) 5175 { 5176 struct nfs4_exception exception = { 5177 .interruptible = true, 5178 }; 5179 int err; 5180 do { 5181 err = _nfs4_proc_readdir(arg, res); 5182 trace_nfs4_readdir(d_inode(arg->dentry), err); 5183 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5184 err, &exception); 5185 } while (exception.retry); 5186 return err; 5187 } 5188 5189 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5190 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5191 { 5192 struct nfs4_createdata *data; 5193 int mode = sattr->ia_mode; 5194 int status = -ENOMEM; 5195 5196 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5197 if (data == NULL) 5198 goto out; 5199 5200 if (S_ISFIFO(mode)) 5201 data->arg.ftype = NF4FIFO; 5202 else if (S_ISBLK(mode)) { 5203 data->arg.ftype = NF4BLK; 5204 data->arg.u.device.specdata1 = MAJOR(rdev); 5205 data->arg.u.device.specdata2 = MINOR(rdev); 5206 } 5207 else if (S_ISCHR(mode)) { 5208 data->arg.ftype = NF4CHR; 5209 data->arg.u.device.specdata1 = MAJOR(rdev); 5210 data->arg.u.device.specdata2 = MINOR(rdev); 5211 } else if (!S_ISSOCK(mode)) { 5212 status = -EINVAL; 5213 goto out_free; 5214 } 5215 5216 data->arg.label = label; 5217 status = nfs4_do_create(dir, dentry, data); 5218 out_free: 5219 nfs4_free_createdata(data); 5220 out: 5221 return status; 5222 } 5223 5224 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5225 struct iattr *sattr, dev_t rdev) 5226 { 5227 struct nfs_server *server = NFS_SERVER(dir); 5228 struct nfs4_exception exception = { 5229 .interruptible = true, 5230 }; 5231 struct nfs4_label l, *label; 5232 int err; 5233 5234 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5235 5236 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5237 sattr->ia_mode &= ~current_umask(); 5238 do { 5239 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5240 trace_nfs4_mknod(dir, &dentry->d_name, err); 5241 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5242 &exception); 5243 } while (exception.retry); 5244 5245 nfs4_label_release_security(label); 5246 5247 return err; 5248 } 5249 5250 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5251 struct nfs_fsstat *fsstat) 5252 { 5253 struct nfs4_statfs_arg args = { 5254 .fh = fhandle, 5255 .bitmask = server->attr_bitmask, 5256 }; 5257 struct nfs4_statfs_res res = { 5258 .fsstat = fsstat, 5259 }; 5260 struct rpc_message msg = { 5261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5262 .rpc_argp = &args, 5263 .rpc_resp = &res, 5264 }; 5265 5266 nfs_fattr_init(fsstat->fattr); 5267 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5268 } 5269 5270 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5271 { 5272 struct nfs4_exception exception = { 5273 .interruptible = true, 5274 }; 5275 int err; 5276 do { 5277 err = nfs4_handle_exception(server, 5278 _nfs4_proc_statfs(server, fhandle, fsstat), 5279 &exception); 5280 } while (exception.retry); 5281 return err; 5282 } 5283 5284 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5285 struct nfs_fsinfo *fsinfo) 5286 { 5287 struct nfs4_fsinfo_arg args = { 5288 .fh = fhandle, 5289 .bitmask = server->attr_bitmask, 5290 }; 5291 struct nfs4_fsinfo_res res = { 5292 .fsinfo = fsinfo, 5293 }; 5294 struct rpc_message msg = { 5295 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5296 .rpc_argp = &args, 5297 .rpc_resp = &res, 5298 }; 5299 5300 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5301 } 5302 5303 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5304 { 5305 struct nfs4_exception exception = { 5306 .interruptible = true, 5307 }; 5308 int err; 5309 5310 do { 5311 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5312 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5313 if (err == 0) { 5314 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5315 break; 5316 } 5317 err = nfs4_handle_exception(server, err, &exception); 5318 } while (exception.retry); 5319 return err; 5320 } 5321 5322 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5323 { 5324 int error; 5325 5326 nfs_fattr_init(fsinfo->fattr); 5327 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5328 if (error == 0) { 5329 /* block layout checks this! */ 5330 server->pnfs_blksize = fsinfo->blksize; 5331 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5332 } 5333 5334 return error; 5335 } 5336 5337 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5338 struct nfs_pathconf *pathconf) 5339 { 5340 struct nfs4_pathconf_arg args = { 5341 .fh = fhandle, 5342 .bitmask = server->attr_bitmask, 5343 }; 5344 struct nfs4_pathconf_res res = { 5345 .pathconf = pathconf, 5346 }; 5347 struct rpc_message msg = { 5348 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5349 .rpc_argp = &args, 5350 .rpc_resp = &res, 5351 }; 5352 5353 /* None of the pathconf attributes are mandatory to implement */ 5354 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5355 memset(pathconf, 0, sizeof(*pathconf)); 5356 return 0; 5357 } 5358 5359 nfs_fattr_init(pathconf->fattr); 5360 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5361 } 5362 5363 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5364 struct nfs_pathconf *pathconf) 5365 { 5366 struct nfs4_exception exception = { 5367 .interruptible = true, 5368 }; 5369 int err; 5370 5371 do { 5372 err = nfs4_handle_exception(server, 5373 _nfs4_proc_pathconf(server, fhandle, pathconf), 5374 &exception); 5375 } while (exception.retry); 5376 return err; 5377 } 5378 5379 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5380 const struct nfs_open_context *ctx, 5381 const struct nfs_lock_context *l_ctx, 5382 fmode_t fmode) 5383 { 5384 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5385 } 5386 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5387 5388 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5389 const struct nfs_open_context *ctx, 5390 const struct nfs_lock_context *l_ctx, 5391 fmode_t fmode) 5392 { 5393 nfs4_stateid _current_stateid; 5394 5395 /* If the current stateid represents a lost lock, then exit */ 5396 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5397 return true; 5398 return nfs4_stateid_match(stateid, &_current_stateid); 5399 } 5400 5401 static bool nfs4_error_stateid_expired(int err) 5402 { 5403 switch (err) { 5404 case -NFS4ERR_DELEG_REVOKED: 5405 case -NFS4ERR_ADMIN_REVOKED: 5406 case -NFS4ERR_BAD_STATEID: 5407 case -NFS4ERR_STALE_STATEID: 5408 case -NFS4ERR_OLD_STATEID: 5409 case -NFS4ERR_OPENMODE: 5410 case -NFS4ERR_EXPIRED: 5411 return true; 5412 } 5413 return false; 5414 } 5415 5416 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5417 { 5418 struct nfs_server *server = NFS_SERVER(hdr->inode); 5419 5420 trace_nfs4_read(hdr, task->tk_status); 5421 if (task->tk_status < 0) { 5422 struct nfs4_exception exception = { 5423 .inode = hdr->inode, 5424 .state = hdr->args.context->state, 5425 .stateid = &hdr->args.stateid, 5426 }; 5427 task->tk_status = nfs4_async_handle_exception(task, 5428 server, task->tk_status, &exception); 5429 if (exception.retry) { 5430 rpc_restart_call_prepare(task); 5431 return -EAGAIN; 5432 } 5433 } 5434 5435 if (task->tk_status > 0) 5436 renew_lease(server, hdr->timestamp); 5437 return 0; 5438 } 5439 5440 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5441 struct nfs_pgio_args *args) 5442 { 5443 5444 if (!nfs4_error_stateid_expired(task->tk_status) || 5445 nfs4_stateid_is_current(&args->stateid, 5446 args->context, 5447 args->lock_context, 5448 FMODE_READ)) 5449 return false; 5450 rpc_restart_call_prepare(task); 5451 return true; 5452 } 5453 5454 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5455 struct nfs_pgio_header *hdr) 5456 { 5457 struct nfs_server *server = NFS_SERVER(hdr->inode); 5458 struct rpc_message *msg = &task->tk_msg; 5459 5460 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5461 task->tk_status == -ENOTSUPP) { 5462 server->caps &= ~NFS_CAP_READ_PLUS; 5463 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5464 rpc_restart_call_prepare(task); 5465 return true; 5466 } 5467 return false; 5468 } 5469 5470 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5471 { 5472 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5473 return -EAGAIN; 5474 if (nfs4_read_stateid_changed(task, &hdr->args)) 5475 return -EAGAIN; 5476 if (nfs4_read_plus_not_supported(task, hdr)) 5477 return -EAGAIN; 5478 if (task->tk_status > 0) 5479 nfs_invalidate_atime(hdr->inode); 5480 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5481 nfs4_read_done_cb(task, hdr); 5482 } 5483 5484 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5485 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5486 struct rpc_message *msg) 5487 { 5488 /* Note: We don't use READ_PLUS with pNFS yet */ 5489 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5490 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5491 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5492 } 5493 return false; 5494 } 5495 #else 5496 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5497 struct rpc_message *msg) 5498 { 5499 return false; 5500 } 5501 #endif /* CONFIG_NFS_V4_2 */ 5502 5503 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5504 struct rpc_message *msg) 5505 { 5506 hdr->timestamp = jiffies; 5507 if (!hdr->pgio_done_cb) 5508 hdr->pgio_done_cb = nfs4_read_done_cb; 5509 if (!nfs42_read_plus_support(hdr, msg)) 5510 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5511 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5512 } 5513 5514 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5515 struct nfs_pgio_header *hdr) 5516 { 5517 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5518 &hdr->args.seq_args, 5519 &hdr->res.seq_res, 5520 task)) 5521 return 0; 5522 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5523 hdr->args.lock_context, 5524 hdr->rw_mode) == -EIO) 5525 return -EIO; 5526 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5527 return -EIO; 5528 return 0; 5529 } 5530 5531 static int nfs4_write_done_cb(struct rpc_task *task, 5532 struct nfs_pgio_header *hdr) 5533 { 5534 struct inode *inode = hdr->inode; 5535 5536 trace_nfs4_write(hdr, task->tk_status); 5537 if (task->tk_status < 0) { 5538 struct nfs4_exception exception = { 5539 .inode = hdr->inode, 5540 .state = hdr->args.context->state, 5541 .stateid = &hdr->args.stateid, 5542 }; 5543 task->tk_status = nfs4_async_handle_exception(task, 5544 NFS_SERVER(inode), task->tk_status, 5545 &exception); 5546 if (exception.retry) { 5547 rpc_restart_call_prepare(task); 5548 return -EAGAIN; 5549 } 5550 } 5551 if (task->tk_status >= 0) { 5552 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5553 nfs_writeback_update_inode(hdr); 5554 } 5555 return 0; 5556 } 5557 5558 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5559 struct nfs_pgio_args *args) 5560 { 5561 5562 if (!nfs4_error_stateid_expired(task->tk_status) || 5563 nfs4_stateid_is_current(&args->stateid, 5564 args->context, 5565 args->lock_context, 5566 FMODE_WRITE)) 5567 return false; 5568 rpc_restart_call_prepare(task); 5569 return true; 5570 } 5571 5572 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5573 { 5574 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5575 return -EAGAIN; 5576 if (nfs4_write_stateid_changed(task, &hdr->args)) 5577 return -EAGAIN; 5578 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5579 nfs4_write_done_cb(task, hdr); 5580 } 5581 5582 static 5583 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5584 { 5585 /* Don't request attributes for pNFS or O_DIRECT writes */ 5586 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5587 return false; 5588 /* Otherwise, request attributes if and only if we don't hold 5589 * a delegation 5590 */ 5591 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5592 } 5593 5594 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5595 struct inode *inode, unsigned long cache_validity) 5596 { 5597 struct nfs_server *server = NFS_SERVER(inode); 5598 unsigned int i; 5599 5600 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5601 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5602 5603 if (cache_validity & NFS_INO_INVALID_CHANGE) 5604 bitmask[0] |= FATTR4_WORD0_CHANGE; 5605 if (cache_validity & NFS_INO_INVALID_ATIME) 5606 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5607 if (cache_validity & NFS_INO_INVALID_MODE) 5608 bitmask[1] |= FATTR4_WORD1_MODE; 5609 if (cache_validity & NFS_INO_INVALID_OTHER) 5610 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5611 if (cache_validity & NFS_INO_INVALID_NLINK) 5612 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5613 if (cache_validity & NFS_INO_INVALID_CTIME) 5614 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5615 if (cache_validity & NFS_INO_INVALID_MTIME) 5616 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5617 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5618 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5619 5620 if (cache_validity & NFS_INO_INVALID_SIZE) 5621 bitmask[0] |= FATTR4_WORD0_SIZE; 5622 5623 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5624 bitmask[i] &= server->attr_bitmask[i]; 5625 } 5626 5627 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5628 struct rpc_message *msg, 5629 struct rpc_clnt **clnt) 5630 { 5631 struct nfs_server *server = NFS_SERVER(hdr->inode); 5632 5633 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5634 hdr->args.bitmask = NULL; 5635 hdr->res.fattr = NULL; 5636 } else { 5637 nfs4_bitmask_set(hdr->args.bitmask_store, 5638 server->cache_consistency_bitmask, 5639 hdr->inode, NFS_INO_INVALID_BLOCKS); 5640 hdr->args.bitmask = hdr->args.bitmask_store; 5641 } 5642 5643 if (!hdr->pgio_done_cb) 5644 hdr->pgio_done_cb = nfs4_write_done_cb; 5645 hdr->res.server = server; 5646 hdr->timestamp = jiffies; 5647 5648 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5649 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5650 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr); 5651 } 5652 5653 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5654 { 5655 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5656 &data->args.seq_args, 5657 &data->res.seq_res, 5658 task); 5659 } 5660 5661 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5662 { 5663 struct inode *inode = data->inode; 5664 5665 trace_nfs4_commit(data, task->tk_status); 5666 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5667 NULL, NULL) == -EAGAIN) { 5668 rpc_restart_call_prepare(task); 5669 return -EAGAIN; 5670 } 5671 return 0; 5672 } 5673 5674 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5675 { 5676 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5677 return -EAGAIN; 5678 return data->commit_done_cb(task, data); 5679 } 5680 5681 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5682 struct rpc_clnt **clnt) 5683 { 5684 struct nfs_server *server = NFS_SERVER(data->inode); 5685 5686 if (data->commit_done_cb == NULL) 5687 data->commit_done_cb = nfs4_commit_done_cb; 5688 data->res.server = server; 5689 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5690 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5691 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client, 5692 NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5693 } 5694 5695 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5696 struct nfs_commitres *res) 5697 { 5698 struct inode *dst_inode = file_inode(dst); 5699 struct nfs_server *server = NFS_SERVER(dst_inode); 5700 struct rpc_message msg = { 5701 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5702 .rpc_argp = args, 5703 .rpc_resp = res, 5704 }; 5705 5706 args->fh = NFS_FH(dst_inode); 5707 return nfs4_call_sync(server->client, server, &msg, 5708 &args->seq_args, &res->seq_res, 1); 5709 } 5710 5711 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5712 { 5713 struct nfs_commitargs args = { 5714 .offset = offset, 5715 .count = count, 5716 }; 5717 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5718 struct nfs4_exception exception = { }; 5719 int status; 5720 5721 do { 5722 status = _nfs4_proc_commit(dst, &args, res); 5723 status = nfs4_handle_exception(dst_server, status, &exception); 5724 } while (exception.retry); 5725 5726 return status; 5727 } 5728 5729 struct nfs4_renewdata { 5730 struct nfs_client *client; 5731 unsigned long timestamp; 5732 }; 5733 5734 /* 5735 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5736 * standalone procedure for queueing an asynchronous RENEW. 5737 */ 5738 static void nfs4_renew_release(void *calldata) 5739 { 5740 struct nfs4_renewdata *data = calldata; 5741 struct nfs_client *clp = data->client; 5742 5743 if (refcount_read(&clp->cl_count) > 1) 5744 nfs4_schedule_state_renewal(clp); 5745 nfs_put_client(clp); 5746 kfree(data); 5747 } 5748 5749 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5750 { 5751 struct nfs4_renewdata *data = calldata; 5752 struct nfs_client *clp = data->client; 5753 unsigned long timestamp = data->timestamp; 5754 5755 trace_nfs4_renew_async(clp, task->tk_status); 5756 switch (task->tk_status) { 5757 case 0: 5758 break; 5759 case -NFS4ERR_LEASE_MOVED: 5760 nfs4_schedule_lease_moved_recovery(clp); 5761 break; 5762 default: 5763 /* Unless we're shutting down, schedule state recovery! */ 5764 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5765 return; 5766 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5767 nfs4_schedule_lease_recovery(clp); 5768 return; 5769 } 5770 nfs4_schedule_path_down_recovery(clp); 5771 } 5772 do_renew_lease(clp, timestamp); 5773 } 5774 5775 static const struct rpc_call_ops nfs4_renew_ops = { 5776 .rpc_call_done = nfs4_renew_done, 5777 .rpc_release = nfs4_renew_release, 5778 }; 5779 5780 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5781 { 5782 struct rpc_message msg = { 5783 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5784 .rpc_argp = clp, 5785 .rpc_cred = cred, 5786 }; 5787 struct nfs4_renewdata *data; 5788 5789 if (renew_flags == 0) 5790 return 0; 5791 if (!refcount_inc_not_zero(&clp->cl_count)) 5792 return -EIO; 5793 data = kmalloc(sizeof(*data), GFP_NOFS); 5794 if (data == NULL) { 5795 nfs_put_client(clp); 5796 return -ENOMEM; 5797 } 5798 data->client = clp; 5799 data->timestamp = jiffies; 5800 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5801 &nfs4_renew_ops, data); 5802 } 5803 5804 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5805 { 5806 struct rpc_message msg = { 5807 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5808 .rpc_argp = clp, 5809 .rpc_cred = cred, 5810 }; 5811 unsigned long now = jiffies; 5812 int status; 5813 5814 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5815 if (status < 0) 5816 return status; 5817 do_renew_lease(clp, now); 5818 return 0; 5819 } 5820 5821 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5822 enum nfs4_acl_type type) 5823 { 5824 switch (type) { 5825 default: 5826 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5827 case NFS4ACL_DACL: 5828 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5829 case NFS4ACL_SACL: 5830 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5831 } 5832 } 5833 5834 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5835 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5836 * the stack. 5837 */ 5838 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5839 5840 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5841 struct page **pages) 5842 { 5843 struct page *newpage, **spages; 5844 int rc = 0; 5845 size_t len; 5846 spages = pages; 5847 5848 do { 5849 len = min_t(size_t, PAGE_SIZE, buflen); 5850 newpage = alloc_page(GFP_KERNEL); 5851 5852 if (newpage == NULL) 5853 goto unwind; 5854 memcpy(page_address(newpage), buf, len); 5855 buf += len; 5856 buflen -= len; 5857 *pages++ = newpage; 5858 rc++; 5859 } while (buflen != 0); 5860 5861 return rc; 5862 5863 unwind: 5864 for(; rc > 0; rc--) 5865 __free_page(spages[rc-1]); 5866 return -ENOMEM; 5867 } 5868 5869 struct nfs4_cached_acl { 5870 enum nfs4_acl_type type; 5871 int cached; 5872 size_t len; 5873 char data[]; 5874 }; 5875 5876 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5877 { 5878 struct nfs_inode *nfsi = NFS_I(inode); 5879 5880 spin_lock(&inode->i_lock); 5881 kfree(nfsi->nfs4_acl); 5882 nfsi->nfs4_acl = acl; 5883 spin_unlock(&inode->i_lock); 5884 } 5885 5886 static void nfs4_zap_acl_attr(struct inode *inode) 5887 { 5888 nfs4_set_cached_acl(inode, NULL); 5889 } 5890 5891 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5892 size_t buflen, enum nfs4_acl_type type) 5893 { 5894 struct nfs_inode *nfsi = NFS_I(inode); 5895 struct nfs4_cached_acl *acl; 5896 int ret = -ENOENT; 5897 5898 spin_lock(&inode->i_lock); 5899 acl = nfsi->nfs4_acl; 5900 if (acl == NULL) 5901 goto out; 5902 if (acl->type != type) 5903 goto out; 5904 if (buf == NULL) /* user is just asking for length */ 5905 goto out_len; 5906 if (acl->cached == 0) 5907 goto out; 5908 ret = -ERANGE; /* see getxattr(2) man page */ 5909 if (acl->len > buflen) 5910 goto out; 5911 memcpy(buf, acl->data, acl->len); 5912 out_len: 5913 ret = acl->len; 5914 out: 5915 spin_unlock(&inode->i_lock); 5916 return ret; 5917 } 5918 5919 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5920 size_t pgbase, size_t acl_len, 5921 enum nfs4_acl_type type) 5922 { 5923 struct nfs4_cached_acl *acl; 5924 size_t buflen = sizeof(*acl) + acl_len; 5925 5926 if (buflen <= PAGE_SIZE) { 5927 acl = kmalloc(buflen, GFP_KERNEL); 5928 if (acl == NULL) 5929 goto out; 5930 acl->cached = 1; 5931 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5932 } else { 5933 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5934 if (acl == NULL) 5935 goto out; 5936 acl->cached = 0; 5937 } 5938 acl->type = type; 5939 acl->len = acl_len; 5940 out: 5941 nfs4_set_cached_acl(inode, acl); 5942 } 5943 5944 /* 5945 * The getxattr API returns the required buffer length when called with a 5946 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5947 * the required buf. On a NULL buf, we send a page of data to the server 5948 * guessing that the ACL request can be serviced by a page. If so, we cache 5949 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5950 * the cache. If not so, we throw away the page, and cache the required 5951 * length. The next getxattr call will then produce another round trip to 5952 * the server, this time with the input buf of the required size. 5953 */ 5954 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5955 size_t buflen, enum nfs4_acl_type type) 5956 { 5957 struct page **pages; 5958 struct nfs_getaclargs args = { 5959 .fh = NFS_FH(inode), 5960 .acl_type = type, 5961 .acl_len = buflen, 5962 }; 5963 struct nfs_getaclres res = { 5964 .acl_type = type, 5965 .acl_len = buflen, 5966 }; 5967 struct rpc_message msg = { 5968 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5969 .rpc_argp = &args, 5970 .rpc_resp = &res, 5971 }; 5972 unsigned int npages; 5973 int ret = -ENOMEM, i; 5974 struct nfs_server *server = NFS_SERVER(inode); 5975 5976 if (buflen == 0) 5977 buflen = server->rsize; 5978 5979 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5980 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5981 if (!pages) 5982 return -ENOMEM; 5983 5984 args.acl_pages = pages; 5985 5986 for (i = 0; i < npages; i++) { 5987 pages[i] = alloc_page(GFP_KERNEL); 5988 if (!pages[i]) 5989 goto out_free; 5990 } 5991 5992 /* for decoding across pages */ 5993 res.acl_scratch = alloc_page(GFP_KERNEL); 5994 if (!res.acl_scratch) 5995 goto out_free; 5996 5997 args.acl_len = npages * PAGE_SIZE; 5998 5999 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 6000 __func__, buf, buflen, npages, args.acl_len); 6001 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 6002 &msg, &args.seq_args, &res.seq_res, 0); 6003 if (ret) 6004 goto out_free; 6005 6006 /* Handle the case where the passed-in buffer is too short */ 6007 if (res.acl_flags & NFS4_ACL_TRUNC) { 6008 /* Did the user only issue a request for the acl length? */ 6009 if (buf == NULL) 6010 goto out_ok; 6011 ret = -ERANGE; 6012 goto out_free; 6013 } 6014 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 6015 type); 6016 if (buf) { 6017 if (res.acl_len > buflen) { 6018 ret = -ERANGE; 6019 goto out_free; 6020 } 6021 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 6022 } 6023 out_ok: 6024 ret = res.acl_len; 6025 out_free: 6026 while (--i >= 0) 6027 __free_page(pages[i]); 6028 if (res.acl_scratch) 6029 __free_page(res.acl_scratch); 6030 kfree(pages); 6031 return ret; 6032 } 6033 6034 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6035 size_t buflen, enum nfs4_acl_type type) 6036 { 6037 struct nfs4_exception exception = { 6038 .interruptible = true, 6039 }; 6040 ssize_t ret; 6041 do { 6042 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6043 trace_nfs4_get_acl(inode, ret); 6044 if (ret >= 0) 6045 break; 6046 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6047 } while (exception.retry); 6048 return ret; 6049 } 6050 6051 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6052 enum nfs4_acl_type type) 6053 { 6054 struct nfs_server *server = NFS_SERVER(inode); 6055 int ret; 6056 6057 if (!nfs4_server_supports_acls(server, type)) 6058 return -EOPNOTSUPP; 6059 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6060 if (ret < 0) 6061 return ret; 6062 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6063 nfs_zap_acl_cache(inode); 6064 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6065 if (ret != -ENOENT) 6066 /* -ENOENT is returned if there is no ACL or if there is an ACL 6067 * but no cached acl data, just the acl length */ 6068 return ret; 6069 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6070 } 6071 6072 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6073 size_t buflen, enum nfs4_acl_type type) 6074 { 6075 struct nfs_server *server = NFS_SERVER(inode); 6076 struct page *pages[NFS4ACL_MAXPAGES]; 6077 struct nfs_setaclargs arg = { 6078 .fh = NFS_FH(inode), 6079 .acl_type = type, 6080 .acl_len = buflen, 6081 .acl_pages = pages, 6082 }; 6083 struct nfs_setaclres res; 6084 struct rpc_message msg = { 6085 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6086 .rpc_argp = &arg, 6087 .rpc_resp = &res, 6088 }; 6089 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6090 int ret, i; 6091 6092 /* You can't remove system.nfs4_acl: */ 6093 if (buflen == 0) 6094 return -EINVAL; 6095 if (!nfs4_server_supports_acls(server, type)) 6096 return -EOPNOTSUPP; 6097 if (npages > ARRAY_SIZE(pages)) 6098 return -ERANGE; 6099 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6100 if (i < 0) 6101 return i; 6102 nfs4_inode_make_writeable(inode); 6103 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6104 6105 /* 6106 * Free each page after tx, so the only ref left is 6107 * held by the network stack 6108 */ 6109 for (; i > 0; i--) 6110 put_page(pages[i-1]); 6111 6112 /* 6113 * Acl update can result in inode attribute update. 6114 * so mark the attribute cache invalid. 6115 */ 6116 spin_lock(&inode->i_lock); 6117 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6118 NFS_INO_INVALID_CTIME | 6119 NFS_INO_REVAL_FORCED); 6120 spin_unlock(&inode->i_lock); 6121 nfs_access_zap_cache(inode); 6122 nfs_zap_acl_cache(inode); 6123 return ret; 6124 } 6125 6126 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6127 size_t buflen, enum nfs4_acl_type type) 6128 { 6129 struct nfs4_exception exception = { }; 6130 int err; 6131 do { 6132 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6133 trace_nfs4_set_acl(inode, err); 6134 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6135 /* 6136 * no need to retry since the kernel 6137 * isn't involved in encoding the ACEs. 6138 */ 6139 err = -EINVAL; 6140 break; 6141 } 6142 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6143 &exception); 6144 } while (exception.retry); 6145 return err; 6146 } 6147 6148 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6149 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6150 size_t buflen) 6151 { 6152 struct nfs_server *server = NFS_SERVER(inode); 6153 struct nfs4_label label = {0, 0, buflen, buf}; 6154 6155 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6156 struct nfs_fattr fattr = { 6157 .label = &label, 6158 }; 6159 struct nfs4_getattr_arg arg = { 6160 .fh = NFS_FH(inode), 6161 .bitmask = bitmask, 6162 }; 6163 struct nfs4_getattr_res res = { 6164 .fattr = &fattr, 6165 .server = server, 6166 }; 6167 struct rpc_message msg = { 6168 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6169 .rpc_argp = &arg, 6170 .rpc_resp = &res, 6171 }; 6172 int ret; 6173 6174 nfs_fattr_init(&fattr); 6175 6176 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6177 if (ret) 6178 return ret; 6179 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6180 return -ENOENT; 6181 return label.len; 6182 } 6183 6184 static int nfs4_get_security_label(struct inode *inode, void *buf, 6185 size_t buflen) 6186 { 6187 struct nfs4_exception exception = { 6188 .interruptible = true, 6189 }; 6190 int err; 6191 6192 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6193 return -EOPNOTSUPP; 6194 6195 do { 6196 err = _nfs4_get_security_label(inode, buf, buflen); 6197 trace_nfs4_get_security_label(inode, err); 6198 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6199 &exception); 6200 } while (exception.retry); 6201 return err; 6202 } 6203 6204 static int _nfs4_do_set_security_label(struct inode *inode, 6205 struct nfs4_label *ilabel, 6206 struct nfs_fattr *fattr) 6207 { 6208 6209 struct iattr sattr = {0}; 6210 struct nfs_server *server = NFS_SERVER(inode); 6211 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6212 struct nfs_setattrargs arg = { 6213 .fh = NFS_FH(inode), 6214 .iap = &sattr, 6215 .server = server, 6216 .bitmask = bitmask, 6217 .label = ilabel, 6218 }; 6219 struct nfs_setattrres res = { 6220 .fattr = fattr, 6221 .server = server, 6222 }; 6223 struct rpc_message msg = { 6224 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6225 .rpc_argp = &arg, 6226 .rpc_resp = &res, 6227 }; 6228 int status; 6229 6230 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6231 6232 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6233 if (status) 6234 dprintk("%s failed: %d\n", __func__, status); 6235 6236 return status; 6237 } 6238 6239 static int nfs4_do_set_security_label(struct inode *inode, 6240 struct nfs4_label *ilabel, 6241 struct nfs_fattr *fattr) 6242 { 6243 struct nfs4_exception exception = { }; 6244 int err; 6245 6246 do { 6247 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6248 trace_nfs4_set_security_label(inode, err); 6249 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6250 &exception); 6251 } while (exception.retry); 6252 return err; 6253 } 6254 6255 static int 6256 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6257 { 6258 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6259 struct nfs_fattr *fattr; 6260 int status; 6261 6262 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6263 return -EOPNOTSUPP; 6264 6265 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6266 if (fattr == NULL) 6267 return -ENOMEM; 6268 6269 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6270 if (status == 0) 6271 nfs_setsecurity(inode, fattr); 6272 6273 nfs_free_fattr(fattr); 6274 return status; 6275 } 6276 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6277 6278 6279 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6280 nfs4_verifier *bootverf) 6281 { 6282 __be32 verf[2]; 6283 6284 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6285 /* An impossible timestamp guarantees this value 6286 * will never match a generated boot time. */ 6287 verf[0] = cpu_to_be32(U32_MAX); 6288 verf[1] = cpu_to_be32(U32_MAX); 6289 } else { 6290 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6291 u64 ns = ktime_to_ns(nn->boot_time); 6292 6293 verf[0] = cpu_to_be32(ns >> 32); 6294 verf[1] = cpu_to_be32(ns); 6295 } 6296 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6297 } 6298 6299 static size_t 6300 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6301 { 6302 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6303 struct nfs_netns_client *nn_clp = nn->nfs_client; 6304 const char *id; 6305 6306 buf[0] = '\0'; 6307 6308 if (nn_clp) { 6309 rcu_read_lock(); 6310 id = rcu_dereference(nn_clp->identifier); 6311 if (id) 6312 strscpy(buf, id, buflen); 6313 rcu_read_unlock(); 6314 } 6315 6316 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6317 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6318 6319 return strlen(buf); 6320 } 6321 6322 static int 6323 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6324 { 6325 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6326 size_t buflen; 6327 size_t len; 6328 char *str; 6329 6330 if (clp->cl_owner_id != NULL) 6331 return 0; 6332 6333 rcu_read_lock(); 6334 len = 14 + 6335 strlen(clp->cl_rpcclient->cl_nodename) + 6336 1 + 6337 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6338 1; 6339 rcu_read_unlock(); 6340 6341 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6342 if (buflen) 6343 len += buflen + 1; 6344 6345 if (len > NFS4_OPAQUE_LIMIT + 1) 6346 return -EINVAL; 6347 6348 /* 6349 * Since this string is allocated at mount time, and held until the 6350 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6351 * about a memory-reclaim deadlock. 6352 */ 6353 str = kmalloc(len, GFP_KERNEL); 6354 if (!str) 6355 return -ENOMEM; 6356 6357 rcu_read_lock(); 6358 if (buflen) 6359 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6360 clp->cl_rpcclient->cl_nodename, buf, 6361 rpc_peeraddr2str(clp->cl_rpcclient, 6362 RPC_DISPLAY_ADDR)); 6363 else 6364 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6365 clp->cl_rpcclient->cl_nodename, 6366 rpc_peeraddr2str(clp->cl_rpcclient, 6367 RPC_DISPLAY_ADDR)); 6368 rcu_read_unlock(); 6369 6370 clp->cl_owner_id = str; 6371 return 0; 6372 } 6373 6374 static int 6375 nfs4_init_uniform_client_string(struct nfs_client *clp) 6376 { 6377 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6378 size_t buflen; 6379 size_t len; 6380 char *str; 6381 6382 if (clp->cl_owner_id != NULL) 6383 return 0; 6384 6385 len = 10 + 10 + 1 + 10 + 1 + 6386 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6387 6388 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6389 if (buflen) 6390 len += buflen + 1; 6391 6392 if (len > NFS4_OPAQUE_LIMIT + 1) 6393 return -EINVAL; 6394 6395 /* 6396 * Since this string is allocated at mount time, and held until the 6397 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6398 * about a memory-reclaim deadlock. 6399 */ 6400 str = kmalloc(len, GFP_KERNEL); 6401 if (!str) 6402 return -ENOMEM; 6403 6404 if (buflen) 6405 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6406 clp->rpc_ops->version, clp->cl_minorversion, 6407 buf, clp->cl_rpcclient->cl_nodename); 6408 else 6409 scnprintf(str, len, "Linux NFSv%u.%u %s", 6410 clp->rpc_ops->version, clp->cl_minorversion, 6411 clp->cl_rpcclient->cl_nodename); 6412 clp->cl_owner_id = str; 6413 return 0; 6414 } 6415 6416 /* 6417 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6418 * services. Advertise one based on the address family of the 6419 * clientaddr. 6420 */ 6421 static unsigned int 6422 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6423 { 6424 if (strchr(clp->cl_ipaddr, ':') != NULL) 6425 return scnprintf(buf, len, "tcp6"); 6426 else 6427 return scnprintf(buf, len, "tcp"); 6428 } 6429 6430 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6431 { 6432 struct nfs4_setclientid *sc = calldata; 6433 6434 if (task->tk_status == 0) 6435 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6436 } 6437 6438 static const struct rpc_call_ops nfs4_setclientid_ops = { 6439 .rpc_call_done = nfs4_setclientid_done, 6440 }; 6441 6442 /** 6443 * nfs4_proc_setclientid - Negotiate client ID 6444 * @clp: state data structure 6445 * @program: RPC program for NFSv4 callback service 6446 * @port: IP port number for NFS4 callback service 6447 * @cred: credential to use for this call 6448 * @res: where to place the result 6449 * 6450 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6451 */ 6452 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6453 unsigned short port, const struct cred *cred, 6454 struct nfs4_setclientid_res *res) 6455 { 6456 nfs4_verifier sc_verifier; 6457 struct nfs4_setclientid setclientid = { 6458 .sc_verifier = &sc_verifier, 6459 .sc_prog = program, 6460 .sc_clnt = clp, 6461 }; 6462 struct rpc_message msg = { 6463 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6464 .rpc_argp = &setclientid, 6465 .rpc_resp = res, 6466 .rpc_cred = cred, 6467 }; 6468 struct rpc_task_setup task_setup_data = { 6469 .rpc_client = clp->cl_rpcclient, 6470 .rpc_message = &msg, 6471 .callback_ops = &nfs4_setclientid_ops, 6472 .callback_data = &setclientid, 6473 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6474 }; 6475 unsigned long now = jiffies; 6476 int status; 6477 6478 /* nfs_client_id4 */ 6479 nfs4_init_boot_verifier(clp, &sc_verifier); 6480 6481 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6482 status = nfs4_init_uniform_client_string(clp); 6483 else 6484 status = nfs4_init_nonuniform_client_string(clp); 6485 6486 if (status) 6487 goto out; 6488 6489 /* cb_client4 */ 6490 setclientid.sc_netid_len = 6491 nfs4_init_callback_netid(clp, 6492 setclientid.sc_netid, 6493 sizeof(setclientid.sc_netid)); 6494 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6495 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6496 clp->cl_ipaddr, port >> 8, port & 255); 6497 6498 dprintk("NFS call setclientid auth=%s, '%s'\n", 6499 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6500 clp->cl_owner_id); 6501 6502 status = nfs4_call_sync_custom(&task_setup_data); 6503 if (setclientid.sc_cred) { 6504 kfree(clp->cl_acceptor); 6505 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6506 put_rpccred(setclientid.sc_cred); 6507 } 6508 6509 if (status == 0) 6510 do_renew_lease(clp, now); 6511 out: 6512 trace_nfs4_setclientid(clp, status); 6513 dprintk("NFS reply setclientid: %d\n", status); 6514 return status; 6515 } 6516 6517 /** 6518 * nfs4_proc_setclientid_confirm - Confirm client ID 6519 * @clp: state data structure 6520 * @arg: result of a previous SETCLIENTID 6521 * @cred: credential to use for this call 6522 * 6523 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6524 */ 6525 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6526 struct nfs4_setclientid_res *arg, 6527 const struct cred *cred) 6528 { 6529 struct rpc_message msg = { 6530 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6531 .rpc_argp = arg, 6532 .rpc_cred = cred, 6533 }; 6534 int status; 6535 6536 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6537 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6538 clp->cl_clientid); 6539 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6540 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6541 trace_nfs4_setclientid_confirm(clp, status); 6542 dprintk("NFS reply setclientid_confirm: %d\n", status); 6543 return status; 6544 } 6545 6546 struct nfs4_delegreturndata { 6547 struct nfs4_delegreturnargs args; 6548 struct nfs4_delegreturnres res; 6549 struct nfs_fh fh; 6550 nfs4_stateid stateid; 6551 unsigned long timestamp; 6552 struct { 6553 struct nfs4_layoutreturn_args arg; 6554 struct nfs4_layoutreturn_res res; 6555 struct nfs4_xdr_opaque_data ld_private; 6556 u32 roc_barrier; 6557 bool roc; 6558 } lr; 6559 struct nfs_fattr fattr; 6560 int rpc_status; 6561 struct inode *inode; 6562 }; 6563 6564 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6565 { 6566 struct nfs4_delegreturndata *data = calldata; 6567 struct nfs4_exception exception = { 6568 .inode = data->inode, 6569 .stateid = &data->stateid, 6570 .task_is_privileged = data->args.seq_args.sa_privileged, 6571 }; 6572 6573 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6574 return; 6575 6576 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6577 6578 /* Handle Layoutreturn errors */ 6579 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6580 &data->res.lr_ret) == -EAGAIN) 6581 goto out_restart; 6582 6583 switch (task->tk_status) { 6584 case 0: 6585 renew_lease(data->res.server, data->timestamp); 6586 break; 6587 case -NFS4ERR_ADMIN_REVOKED: 6588 case -NFS4ERR_DELEG_REVOKED: 6589 case -NFS4ERR_EXPIRED: 6590 nfs4_free_revoked_stateid(data->res.server, 6591 data->args.stateid, 6592 task->tk_msg.rpc_cred); 6593 fallthrough; 6594 case -NFS4ERR_BAD_STATEID: 6595 case -NFS4ERR_STALE_STATEID: 6596 case -ETIMEDOUT: 6597 task->tk_status = 0; 6598 break; 6599 case -NFS4ERR_OLD_STATEID: 6600 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6601 nfs4_stateid_seqid_inc(&data->stateid); 6602 if (data->args.bitmask) { 6603 data->args.bitmask = NULL; 6604 data->res.fattr = NULL; 6605 } 6606 goto out_restart; 6607 case -NFS4ERR_ACCESS: 6608 if (data->args.bitmask) { 6609 data->args.bitmask = NULL; 6610 data->res.fattr = NULL; 6611 goto out_restart; 6612 } 6613 fallthrough; 6614 default: 6615 task->tk_status = nfs4_async_handle_exception(task, 6616 data->res.server, task->tk_status, 6617 &exception); 6618 if (exception.retry) 6619 goto out_restart; 6620 } 6621 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6622 data->rpc_status = task->tk_status; 6623 return; 6624 out_restart: 6625 task->tk_status = 0; 6626 rpc_restart_call_prepare(task); 6627 } 6628 6629 static void nfs4_delegreturn_release(void *calldata) 6630 { 6631 struct nfs4_delegreturndata *data = calldata; 6632 struct inode *inode = data->inode; 6633 6634 if (data->lr.roc) 6635 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6636 data->res.lr_ret); 6637 if (inode) { 6638 nfs4_fattr_set_prechange(&data->fattr, 6639 inode_peek_iversion_raw(inode)); 6640 nfs_refresh_inode(inode, &data->fattr); 6641 nfs_iput_and_deactive(inode); 6642 } 6643 kfree(calldata); 6644 } 6645 6646 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6647 { 6648 struct nfs4_delegreturndata *d_data; 6649 struct pnfs_layout_hdr *lo; 6650 6651 d_data = data; 6652 6653 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6654 nfs4_sequence_done(task, &d_data->res.seq_res); 6655 return; 6656 } 6657 6658 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6659 if (lo && !pnfs_layout_is_valid(lo)) { 6660 d_data->args.lr_args = NULL; 6661 d_data->res.lr_res = NULL; 6662 } 6663 6664 nfs4_setup_sequence(d_data->res.server->nfs_client, 6665 &d_data->args.seq_args, 6666 &d_data->res.seq_res, 6667 task); 6668 } 6669 6670 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6671 .rpc_call_prepare = nfs4_delegreturn_prepare, 6672 .rpc_call_done = nfs4_delegreturn_done, 6673 .rpc_release = nfs4_delegreturn_release, 6674 }; 6675 6676 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6677 { 6678 struct nfs4_delegreturndata *data; 6679 struct nfs_server *server = NFS_SERVER(inode); 6680 struct rpc_task *task; 6681 struct rpc_message msg = { 6682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6683 .rpc_cred = cred, 6684 }; 6685 struct rpc_task_setup task_setup_data = { 6686 .rpc_client = server->client, 6687 .rpc_message = &msg, 6688 .callback_ops = &nfs4_delegreturn_ops, 6689 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6690 }; 6691 int status = 0; 6692 6693 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6694 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6695 6696 data = kzalloc(sizeof(*data), GFP_KERNEL); 6697 if (data == NULL) 6698 return -ENOMEM; 6699 6700 nfs4_state_protect(server->nfs_client, 6701 NFS_SP4_MACH_CRED_CLEANUP, 6702 &task_setup_data.rpc_client, &msg); 6703 6704 data->args.fhandle = &data->fh; 6705 data->args.stateid = &data->stateid; 6706 nfs4_bitmask_set(data->args.bitmask_store, 6707 server->cache_consistency_bitmask, inode, 0); 6708 data->args.bitmask = data->args.bitmask_store; 6709 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6710 nfs4_stateid_copy(&data->stateid, stateid); 6711 data->res.fattr = &data->fattr; 6712 data->res.server = server; 6713 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6714 data->lr.arg.ld_private = &data->lr.ld_private; 6715 nfs_fattr_init(data->res.fattr); 6716 data->timestamp = jiffies; 6717 data->rpc_status = 0; 6718 data->inode = nfs_igrab_and_active(inode); 6719 if (data->inode || issync) { 6720 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6721 cred); 6722 if (data->lr.roc) { 6723 data->args.lr_args = &data->lr.arg; 6724 data->res.lr_res = &data->lr.res; 6725 } 6726 } 6727 6728 if (!data->inode) 6729 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6730 1); 6731 else 6732 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6733 0); 6734 task_setup_data.callback_data = data; 6735 msg.rpc_argp = &data->args; 6736 msg.rpc_resp = &data->res; 6737 task = rpc_run_task(&task_setup_data); 6738 if (IS_ERR(task)) 6739 return PTR_ERR(task); 6740 if (!issync) 6741 goto out; 6742 status = rpc_wait_for_completion_task(task); 6743 if (status != 0) 6744 goto out; 6745 status = data->rpc_status; 6746 out: 6747 rpc_put_task(task); 6748 return status; 6749 } 6750 6751 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6752 { 6753 struct nfs_server *server = NFS_SERVER(inode); 6754 struct nfs4_exception exception = { }; 6755 int err; 6756 do { 6757 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6758 trace_nfs4_delegreturn(inode, stateid, err); 6759 switch (err) { 6760 case -NFS4ERR_STALE_STATEID: 6761 case -NFS4ERR_EXPIRED: 6762 case 0: 6763 return 0; 6764 } 6765 err = nfs4_handle_exception(server, err, &exception); 6766 } while (exception.retry); 6767 return err; 6768 } 6769 6770 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6771 { 6772 struct inode *inode = state->inode; 6773 struct nfs_server *server = NFS_SERVER(inode); 6774 struct nfs_client *clp = server->nfs_client; 6775 struct nfs_lockt_args arg = { 6776 .fh = NFS_FH(inode), 6777 .fl = request, 6778 }; 6779 struct nfs_lockt_res res = { 6780 .denied = request, 6781 }; 6782 struct rpc_message msg = { 6783 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6784 .rpc_argp = &arg, 6785 .rpc_resp = &res, 6786 .rpc_cred = state->owner->so_cred, 6787 }; 6788 struct nfs4_lock_state *lsp; 6789 int status; 6790 6791 arg.lock_owner.clientid = clp->cl_clientid; 6792 status = nfs4_set_lock_state(state, request); 6793 if (status != 0) 6794 goto out; 6795 lsp = request->fl_u.nfs4_fl.owner; 6796 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6797 arg.lock_owner.s_dev = server->s_dev; 6798 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6799 switch (status) { 6800 case 0: 6801 request->fl_type = F_UNLCK; 6802 break; 6803 case -NFS4ERR_DENIED: 6804 status = 0; 6805 } 6806 request->fl_ops->fl_release_private(request); 6807 request->fl_ops = NULL; 6808 out: 6809 return status; 6810 } 6811 6812 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6813 { 6814 struct nfs4_exception exception = { 6815 .interruptible = true, 6816 }; 6817 int err; 6818 6819 do { 6820 err = _nfs4_proc_getlk(state, cmd, request); 6821 trace_nfs4_get_lock(request, state, cmd, err); 6822 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6823 &exception); 6824 } while (exception.retry); 6825 return err; 6826 } 6827 6828 /* 6829 * Update the seqid of a lock stateid after receiving 6830 * NFS4ERR_OLD_STATEID 6831 */ 6832 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6833 struct nfs4_lock_state *lsp) 6834 { 6835 struct nfs4_state *state = lsp->ls_state; 6836 bool ret = false; 6837 6838 spin_lock(&state->state_lock); 6839 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6840 goto out; 6841 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6842 nfs4_stateid_seqid_inc(dst); 6843 else 6844 dst->seqid = lsp->ls_stateid.seqid; 6845 ret = true; 6846 out: 6847 spin_unlock(&state->state_lock); 6848 return ret; 6849 } 6850 6851 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6852 struct nfs4_lock_state *lsp) 6853 { 6854 struct nfs4_state *state = lsp->ls_state; 6855 bool ret; 6856 6857 spin_lock(&state->state_lock); 6858 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6859 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6860 spin_unlock(&state->state_lock); 6861 return ret; 6862 } 6863 6864 struct nfs4_unlockdata { 6865 struct nfs_locku_args arg; 6866 struct nfs_locku_res res; 6867 struct nfs4_lock_state *lsp; 6868 struct nfs_open_context *ctx; 6869 struct nfs_lock_context *l_ctx; 6870 struct file_lock fl; 6871 struct nfs_server *server; 6872 unsigned long timestamp; 6873 }; 6874 6875 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6876 struct nfs_open_context *ctx, 6877 struct nfs4_lock_state *lsp, 6878 struct nfs_seqid *seqid) 6879 { 6880 struct nfs4_unlockdata *p; 6881 struct nfs4_state *state = lsp->ls_state; 6882 struct inode *inode = state->inode; 6883 6884 p = kzalloc(sizeof(*p), GFP_KERNEL); 6885 if (p == NULL) 6886 return NULL; 6887 p->arg.fh = NFS_FH(inode); 6888 p->arg.fl = &p->fl; 6889 p->arg.seqid = seqid; 6890 p->res.seqid = seqid; 6891 p->lsp = lsp; 6892 /* Ensure we don't close file until we're done freeing locks! */ 6893 p->ctx = get_nfs_open_context(ctx); 6894 p->l_ctx = nfs_get_lock_context(ctx); 6895 locks_init_lock(&p->fl); 6896 locks_copy_lock(&p->fl, fl); 6897 p->server = NFS_SERVER(inode); 6898 spin_lock(&state->state_lock); 6899 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6900 spin_unlock(&state->state_lock); 6901 return p; 6902 } 6903 6904 static void nfs4_locku_release_calldata(void *data) 6905 { 6906 struct nfs4_unlockdata *calldata = data; 6907 nfs_free_seqid(calldata->arg.seqid); 6908 nfs4_put_lock_state(calldata->lsp); 6909 nfs_put_lock_context(calldata->l_ctx); 6910 put_nfs_open_context(calldata->ctx); 6911 kfree(calldata); 6912 } 6913 6914 static void nfs4_locku_done(struct rpc_task *task, void *data) 6915 { 6916 struct nfs4_unlockdata *calldata = data; 6917 struct nfs4_exception exception = { 6918 .inode = calldata->lsp->ls_state->inode, 6919 .stateid = &calldata->arg.stateid, 6920 }; 6921 6922 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6923 return; 6924 switch (task->tk_status) { 6925 case 0: 6926 renew_lease(calldata->server, calldata->timestamp); 6927 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6928 if (nfs4_update_lock_stateid(calldata->lsp, 6929 &calldata->res.stateid)) 6930 break; 6931 fallthrough; 6932 case -NFS4ERR_ADMIN_REVOKED: 6933 case -NFS4ERR_EXPIRED: 6934 nfs4_free_revoked_stateid(calldata->server, 6935 &calldata->arg.stateid, 6936 task->tk_msg.rpc_cred); 6937 fallthrough; 6938 case -NFS4ERR_BAD_STATEID: 6939 case -NFS4ERR_STALE_STATEID: 6940 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6941 calldata->lsp)) 6942 rpc_restart_call_prepare(task); 6943 break; 6944 case -NFS4ERR_OLD_STATEID: 6945 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6946 calldata->lsp)) 6947 rpc_restart_call_prepare(task); 6948 break; 6949 default: 6950 task->tk_status = nfs4_async_handle_exception(task, 6951 calldata->server, task->tk_status, 6952 &exception); 6953 if (exception.retry) 6954 rpc_restart_call_prepare(task); 6955 } 6956 nfs_release_seqid(calldata->arg.seqid); 6957 } 6958 6959 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6960 { 6961 struct nfs4_unlockdata *calldata = data; 6962 6963 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6964 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6965 return; 6966 6967 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6968 goto out_wait; 6969 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6970 /* Note: exit _without_ running nfs4_locku_done */ 6971 goto out_no_action; 6972 } 6973 calldata->timestamp = jiffies; 6974 if (nfs4_setup_sequence(calldata->server->nfs_client, 6975 &calldata->arg.seq_args, 6976 &calldata->res.seq_res, 6977 task) != 0) 6978 nfs_release_seqid(calldata->arg.seqid); 6979 return; 6980 out_no_action: 6981 task->tk_action = NULL; 6982 out_wait: 6983 nfs4_sequence_done(task, &calldata->res.seq_res); 6984 } 6985 6986 static const struct rpc_call_ops nfs4_locku_ops = { 6987 .rpc_call_prepare = nfs4_locku_prepare, 6988 .rpc_call_done = nfs4_locku_done, 6989 .rpc_release = nfs4_locku_release_calldata, 6990 }; 6991 6992 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6993 struct nfs_open_context *ctx, 6994 struct nfs4_lock_state *lsp, 6995 struct nfs_seqid *seqid) 6996 { 6997 struct nfs4_unlockdata *data; 6998 struct rpc_message msg = { 6999 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 7000 .rpc_cred = ctx->cred, 7001 }; 7002 struct rpc_task_setup task_setup_data = { 7003 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 7004 .rpc_message = &msg, 7005 .callback_ops = &nfs4_locku_ops, 7006 .workqueue = nfsiod_workqueue, 7007 .flags = RPC_TASK_ASYNC, 7008 }; 7009 7010 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 7011 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7012 7013 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 7014 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 7015 7016 /* Ensure this is an unlock - when canceling a lock, the 7017 * canceled lock is passed in, and it won't be an unlock. 7018 */ 7019 fl->fl_type = F_UNLCK; 7020 if (fl->fl_flags & FL_CLOSE) 7021 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 7022 7023 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7024 if (data == NULL) { 7025 nfs_free_seqid(seqid); 7026 return ERR_PTR(-ENOMEM); 7027 } 7028 7029 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7030 msg.rpc_argp = &data->arg; 7031 msg.rpc_resp = &data->res; 7032 task_setup_data.callback_data = data; 7033 return rpc_run_task(&task_setup_data); 7034 } 7035 7036 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7037 { 7038 struct inode *inode = state->inode; 7039 struct nfs4_state_owner *sp = state->owner; 7040 struct nfs_inode *nfsi = NFS_I(inode); 7041 struct nfs_seqid *seqid; 7042 struct nfs4_lock_state *lsp; 7043 struct rpc_task *task; 7044 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7045 int status = 0; 7046 unsigned char fl_flags = request->fl_flags; 7047 7048 status = nfs4_set_lock_state(state, request); 7049 /* Unlock _before_ we do the RPC call */ 7050 request->fl_flags |= FL_EXISTS; 7051 /* Exclude nfs_delegation_claim_locks() */ 7052 mutex_lock(&sp->so_delegreturn_mutex); 7053 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7054 down_read(&nfsi->rwsem); 7055 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7056 up_read(&nfsi->rwsem); 7057 mutex_unlock(&sp->so_delegreturn_mutex); 7058 goto out; 7059 } 7060 lsp = request->fl_u.nfs4_fl.owner; 7061 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7062 up_read(&nfsi->rwsem); 7063 mutex_unlock(&sp->so_delegreturn_mutex); 7064 if (status != 0) 7065 goto out; 7066 /* Is this a delegated lock? */ 7067 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7068 goto out; 7069 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7070 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7071 status = -ENOMEM; 7072 if (IS_ERR(seqid)) 7073 goto out; 7074 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7075 status = PTR_ERR(task); 7076 if (IS_ERR(task)) 7077 goto out; 7078 status = rpc_wait_for_completion_task(task); 7079 rpc_put_task(task); 7080 out: 7081 request->fl_flags = fl_flags; 7082 trace_nfs4_unlock(request, state, F_SETLK, status); 7083 return status; 7084 } 7085 7086 struct nfs4_lockdata { 7087 struct nfs_lock_args arg; 7088 struct nfs_lock_res res; 7089 struct nfs4_lock_state *lsp; 7090 struct nfs_open_context *ctx; 7091 struct file_lock fl; 7092 unsigned long timestamp; 7093 int rpc_status; 7094 int cancelled; 7095 struct nfs_server *server; 7096 }; 7097 7098 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7099 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7100 gfp_t gfp_mask) 7101 { 7102 struct nfs4_lockdata *p; 7103 struct inode *inode = lsp->ls_state->inode; 7104 struct nfs_server *server = NFS_SERVER(inode); 7105 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7106 7107 p = kzalloc(sizeof(*p), gfp_mask); 7108 if (p == NULL) 7109 return NULL; 7110 7111 p->arg.fh = NFS_FH(inode); 7112 p->arg.fl = &p->fl; 7113 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7114 if (IS_ERR(p->arg.open_seqid)) 7115 goto out_free; 7116 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7117 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7118 if (IS_ERR(p->arg.lock_seqid)) 7119 goto out_free_seqid; 7120 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7121 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7122 p->arg.lock_owner.s_dev = server->s_dev; 7123 p->res.lock_seqid = p->arg.lock_seqid; 7124 p->lsp = lsp; 7125 p->server = server; 7126 p->ctx = get_nfs_open_context(ctx); 7127 locks_init_lock(&p->fl); 7128 locks_copy_lock(&p->fl, fl); 7129 return p; 7130 out_free_seqid: 7131 nfs_free_seqid(p->arg.open_seqid); 7132 out_free: 7133 kfree(p); 7134 return NULL; 7135 } 7136 7137 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7138 { 7139 struct nfs4_lockdata *data = calldata; 7140 struct nfs4_state *state = data->lsp->ls_state; 7141 7142 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7143 goto out_wait; 7144 /* Do we need to do an open_to_lock_owner? */ 7145 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7146 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7147 goto out_release_lock_seqid; 7148 } 7149 nfs4_stateid_copy(&data->arg.open_stateid, 7150 &state->open_stateid); 7151 data->arg.new_lock_owner = 1; 7152 data->res.open_seqid = data->arg.open_seqid; 7153 } else { 7154 data->arg.new_lock_owner = 0; 7155 nfs4_stateid_copy(&data->arg.lock_stateid, 7156 &data->lsp->ls_stateid); 7157 } 7158 if (!nfs4_valid_open_stateid(state)) { 7159 data->rpc_status = -EBADF; 7160 task->tk_action = NULL; 7161 goto out_release_open_seqid; 7162 } 7163 data->timestamp = jiffies; 7164 if (nfs4_setup_sequence(data->server->nfs_client, 7165 &data->arg.seq_args, 7166 &data->res.seq_res, 7167 task) == 0) 7168 return; 7169 out_release_open_seqid: 7170 nfs_release_seqid(data->arg.open_seqid); 7171 out_release_lock_seqid: 7172 nfs_release_seqid(data->arg.lock_seqid); 7173 out_wait: 7174 nfs4_sequence_done(task, &data->res.seq_res); 7175 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7176 } 7177 7178 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7179 { 7180 struct nfs4_lockdata *data = calldata; 7181 struct nfs4_lock_state *lsp = data->lsp; 7182 7183 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7184 return; 7185 7186 data->rpc_status = task->tk_status; 7187 switch (task->tk_status) { 7188 case 0: 7189 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7190 data->timestamp); 7191 if (data->arg.new_lock && !data->cancelled) { 7192 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7193 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7194 goto out_restart; 7195 } 7196 if (data->arg.new_lock_owner != 0) { 7197 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7198 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7199 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7200 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7201 goto out_restart; 7202 break; 7203 case -NFS4ERR_OLD_STATEID: 7204 if (data->arg.new_lock_owner != 0 && 7205 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7206 lsp->ls_state)) 7207 goto out_restart; 7208 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7209 goto out_restart; 7210 fallthrough; 7211 case -NFS4ERR_BAD_STATEID: 7212 case -NFS4ERR_STALE_STATEID: 7213 case -NFS4ERR_EXPIRED: 7214 if (data->arg.new_lock_owner != 0) { 7215 if (!nfs4_stateid_match(&data->arg.open_stateid, 7216 &lsp->ls_state->open_stateid)) 7217 goto out_restart; 7218 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7219 &lsp->ls_stateid)) 7220 goto out_restart; 7221 } 7222 out_done: 7223 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7224 return; 7225 out_restart: 7226 if (!data->cancelled) 7227 rpc_restart_call_prepare(task); 7228 goto out_done; 7229 } 7230 7231 static void nfs4_lock_release(void *calldata) 7232 { 7233 struct nfs4_lockdata *data = calldata; 7234 7235 nfs_free_seqid(data->arg.open_seqid); 7236 if (data->cancelled && data->rpc_status == 0) { 7237 struct rpc_task *task; 7238 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7239 data->arg.lock_seqid); 7240 if (!IS_ERR(task)) 7241 rpc_put_task_async(task); 7242 dprintk("%s: cancelling lock!\n", __func__); 7243 } else 7244 nfs_free_seqid(data->arg.lock_seqid); 7245 nfs4_put_lock_state(data->lsp); 7246 put_nfs_open_context(data->ctx); 7247 kfree(data); 7248 } 7249 7250 static const struct rpc_call_ops nfs4_lock_ops = { 7251 .rpc_call_prepare = nfs4_lock_prepare, 7252 .rpc_call_done = nfs4_lock_done, 7253 .rpc_release = nfs4_lock_release, 7254 }; 7255 7256 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7257 { 7258 switch (error) { 7259 case -NFS4ERR_ADMIN_REVOKED: 7260 case -NFS4ERR_EXPIRED: 7261 case -NFS4ERR_BAD_STATEID: 7262 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7263 if (new_lock_owner != 0 || 7264 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7265 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7266 break; 7267 case -NFS4ERR_STALE_STATEID: 7268 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7269 nfs4_schedule_lease_recovery(server->nfs_client); 7270 } 7271 } 7272 7273 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7274 { 7275 struct nfs4_lockdata *data; 7276 struct rpc_task *task; 7277 struct rpc_message msg = { 7278 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7279 .rpc_cred = state->owner->so_cred, 7280 }; 7281 struct rpc_task_setup task_setup_data = { 7282 .rpc_client = NFS_CLIENT(state->inode), 7283 .rpc_message = &msg, 7284 .callback_ops = &nfs4_lock_ops, 7285 .workqueue = nfsiod_workqueue, 7286 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7287 }; 7288 int ret; 7289 7290 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7291 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7292 7293 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7294 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7295 if (data == NULL) 7296 return -ENOMEM; 7297 if (IS_SETLKW(cmd)) 7298 data->arg.block = 1; 7299 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7300 recovery_type > NFS_LOCK_NEW); 7301 msg.rpc_argp = &data->arg; 7302 msg.rpc_resp = &data->res; 7303 task_setup_data.callback_data = data; 7304 if (recovery_type > NFS_LOCK_NEW) { 7305 if (recovery_type == NFS_LOCK_RECLAIM) 7306 data->arg.reclaim = NFS_LOCK_RECLAIM; 7307 } else 7308 data->arg.new_lock = 1; 7309 task = rpc_run_task(&task_setup_data); 7310 if (IS_ERR(task)) 7311 return PTR_ERR(task); 7312 ret = rpc_wait_for_completion_task(task); 7313 if (ret == 0) { 7314 ret = data->rpc_status; 7315 if (ret) 7316 nfs4_handle_setlk_error(data->server, data->lsp, 7317 data->arg.new_lock_owner, ret); 7318 } else 7319 data->cancelled = true; 7320 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7321 rpc_put_task(task); 7322 dprintk("%s: ret = %d\n", __func__, ret); 7323 return ret; 7324 } 7325 7326 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7327 { 7328 struct nfs_server *server = NFS_SERVER(state->inode); 7329 struct nfs4_exception exception = { 7330 .inode = state->inode, 7331 }; 7332 int err; 7333 7334 do { 7335 /* Cache the lock if possible... */ 7336 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7337 return 0; 7338 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7339 if (err != -NFS4ERR_DELAY) 7340 break; 7341 nfs4_handle_exception(server, err, &exception); 7342 } while (exception.retry); 7343 return err; 7344 } 7345 7346 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7347 { 7348 struct nfs_server *server = NFS_SERVER(state->inode); 7349 struct nfs4_exception exception = { 7350 .inode = state->inode, 7351 }; 7352 int err; 7353 7354 err = nfs4_set_lock_state(state, request); 7355 if (err != 0) 7356 return err; 7357 if (!recover_lost_locks) { 7358 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7359 return 0; 7360 } 7361 do { 7362 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7363 return 0; 7364 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7365 switch (err) { 7366 default: 7367 goto out; 7368 case -NFS4ERR_GRACE: 7369 case -NFS4ERR_DELAY: 7370 nfs4_handle_exception(server, err, &exception); 7371 err = 0; 7372 } 7373 } while (exception.retry); 7374 out: 7375 return err; 7376 } 7377 7378 #if defined(CONFIG_NFS_V4_1) 7379 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7380 { 7381 struct nfs4_lock_state *lsp; 7382 int status; 7383 7384 status = nfs4_set_lock_state(state, request); 7385 if (status != 0) 7386 return status; 7387 lsp = request->fl_u.nfs4_fl.owner; 7388 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7389 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7390 return 0; 7391 return nfs4_lock_expired(state, request); 7392 } 7393 #endif 7394 7395 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7396 { 7397 struct nfs_inode *nfsi = NFS_I(state->inode); 7398 struct nfs4_state_owner *sp = state->owner; 7399 unsigned char fl_flags = request->fl_flags; 7400 int status; 7401 7402 request->fl_flags |= FL_ACCESS; 7403 status = locks_lock_inode_wait(state->inode, request); 7404 if (status < 0) 7405 goto out; 7406 mutex_lock(&sp->so_delegreturn_mutex); 7407 down_read(&nfsi->rwsem); 7408 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7409 /* Yes: cache locks! */ 7410 /* ...but avoid races with delegation recall... */ 7411 request->fl_flags = fl_flags & ~FL_SLEEP; 7412 status = locks_lock_inode_wait(state->inode, request); 7413 up_read(&nfsi->rwsem); 7414 mutex_unlock(&sp->so_delegreturn_mutex); 7415 goto out; 7416 } 7417 up_read(&nfsi->rwsem); 7418 mutex_unlock(&sp->so_delegreturn_mutex); 7419 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7420 out: 7421 request->fl_flags = fl_flags; 7422 return status; 7423 } 7424 7425 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7426 { 7427 struct nfs4_exception exception = { 7428 .state = state, 7429 .inode = state->inode, 7430 .interruptible = true, 7431 }; 7432 int err; 7433 7434 do { 7435 err = _nfs4_proc_setlk(state, cmd, request); 7436 if (err == -NFS4ERR_DENIED) 7437 err = -EAGAIN; 7438 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7439 err, &exception); 7440 } while (exception.retry); 7441 return err; 7442 } 7443 7444 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7445 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7446 7447 static int 7448 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7449 struct file_lock *request) 7450 { 7451 int status = -ERESTARTSYS; 7452 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7453 7454 while(!signalled()) { 7455 status = nfs4_proc_setlk(state, cmd, request); 7456 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7457 break; 7458 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7459 schedule_timeout(timeout); 7460 timeout *= 2; 7461 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7462 status = -ERESTARTSYS; 7463 } 7464 return status; 7465 } 7466 7467 #ifdef CONFIG_NFS_V4_1 7468 struct nfs4_lock_waiter { 7469 struct inode *inode; 7470 struct nfs_lowner owner; 7471 wait_queue_entry_t wait; 7472 }; 7473 7474 static int 7475 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7476 { 7477 struct nfs4_lock_waiter *waiter = 7478 container_of(wait, struct nfs4_lock_waiter, wait); 7479 7480 /* NULL key means to wake up everyone */ 7481 if (key) { 7482 struct cb_notify_lock_args *cbnl = key; 7483 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7484 *wowner = &waiter->owner; 7485 7486 /* Only wake if the callback was for the same owner. */ 7487 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7488 return 0; 7489 7490 /* Make sure it's for the right inode */ 7491 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7492 return 0; 7493 } 7494 7495 return woken_wake_function(wait, mode, flags, key); 7496 } 7497 7498 static int 7499 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7500 { 7501 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7502 struct nfs_server *server = NFS_SERVER(state->inode); 7503 struct nfs_client *clp = server->nfs_client; 7504 wait_queue_head_t *q = &clp->cl_lock_waitq; 7505 struct nfs4_lock_waiter waiter = { 7506 .inode = state->inode, 7507 .owner = { .clientid = clp->cl_clientid, 7508 .id = lsp->ls_seqid.owner_id, 7509 .s_dev = server->s_dev }, 7510 }; 7511 int status; 7512 7513 /* Don't bother with waitqueue if we don't expect a callback */ 7514 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7515 return nfs4_retry_setlk_simple(state, cmd, request); 7516 7517 init_wait(&waiter.wait); 7518 waiter.wait.func = nfs4_wake_lock_waiter; 7519 add_wait_queue(q, &waiter.wait); 7520 7521 do { 7522 status = nfs4_proc_setlk(state, cmd, request); 7523 if (status != -EAGAIN || IS_SETLK(cmd)) 7524 break; 7525 7526 status = -ERESTARTSYS; 7527 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7528 NFS4_LOCK_MAXTIMEOUT); 7529 } while (!signalled()); 7530 7531 remove_wait_queue(q, &waiter.wait); 7532 7533 return status; 7534 } 7535 #else /* !CONFIG_NFS_V4_1 */ 7536 static inline int 7537 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7538 { 7539 return nfs4_retry_setlk_simple(state, cmd, request); 7540 } 7541 #endif 7542 7543 static int 7544 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7545 { 7546 struct nfs_open_context *ctx; 7547 struct nfs4_state *state; 7548 int status; 7549 7550 /* verify open state */ 7551 ctx = nfs_file_open_context(filp); 7552 state = ctx->state; 7553 7554 if (IS_GETLK(cmd)) { 7555 if (state != NULL) 7556 return nfs4_proc_getlk(state, F_GETLK, request); 7557 return 0; 7558 } 7559 7560 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7561 return -EINVAL; 7562 7563 if (request->fl_type == F_UNLCK) { 7564 if (state != NULL) 7565 return nfs4_proc_unlck(state, cmd, request); 7566 return 0; 7567 } 7568 7569 if (state == NULL) 7570 return -ENOLCK; 7571 7572 if ((request->fl_flags & FL_POSIX) && 7573 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7574 return -ENOLCK; 7575 7576 /* 7577 * Don't rely on the VFS having checked the file open mode, 7578 * since it won't do this for flock() locks. 7579 */ 7580 switch (request->fl_type) { 7581 case F_RDLCK: 7582 if (!(filp->f_mode & FMODE_READ)) 7583 return -EBADF; 7584 break; 7585 case F_WRLCK: 7586 if (!(filp->f_mode & FMODE_WRITE)) 7587 return -EBADF; 7588 } 7589 7590 status = nfs4_set_lock_state(state, request); 7591 if (status != 0) 7592 return status; 7593 7594 return nfs4_retry_setlk(state, cmd, request); 7595 } 7596 7597 static int nfs4_delete_lease(struct file *file, void **priv) 7598 { 7599 return generic_setlease(file, F_UNLCK, NULL, priv); 7600 } 7601 7602 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease, 7603 void **priv) 7604 { 7605 struct inode *inode = file_inode(file); 7606 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7607 int ret; 7608 7609 /* No delegation, no lease */ 7610 if (!nfs4_have_delegation(inode, type)) 7611 return -EAGAIN; 7612 ret = generic_setlease(file, arg, lease, priv); 7613 if (ret || nfs4_have_delegation(inode, type)) 7614 return ret; 7615 /* We raced with a delegation return */ 7616 nfs4_delete_lease(file, priv); 7617 return -EAGAIN; 7618 } 7619 7620 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease, 7621 void **priv) 7622 { 7623 switch (arg) { 7624 case F_RDLCK: 7625 case F_WRLCK: 7626 return nfs4_add_lease(file, arg, lease, priv); 7627 case F_UNLCK: 7628 return nfs4_delete_lease(file, priv); 7629 default: 7630 return -EINVAL; 7631 } 7632 } 7633 7634 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7635 { 7636 struct nfs_server *server = NFS_SERVER(state->inode); 7637 int err; 7638 7639 err = nfs4_set_lock_state(state, fl); 7640 if (err != 0) 7641 return err; 7642 do { 7643 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7644 if (err != -NFS4ERR_DELAY) 7645 break; 7646 ssleep(1); 7647 } while (err == -NFS4ERR_DELAY); 7648 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7649 } 7650 7651 struct nfs_release_lockowner_data { 7652 struct nfs4_lock_state *lsp; 7653 struct nfs_server *server; 7654 struct nfs_release_lockowner_args args; 7655 struct nfs_release_lockowner_res res; 7656 unsigned long timestamp; 7657 }; 7658 7659 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7660 { 7661 struct nfs_release_lockowner_data *data = calldata; 7662 struct nfs_server *server = data->server; 7663 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7664 &data->res.seq_res, task); 7665 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7666 data->timestamp = jiffies; 7667 } 7668 7669 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7670 { 7671 struct nfs_release_lockowner_data *data = calldata; 7672 struct nfs_server *server = data->server; 7673 7674 nfs40_sequence_done(task, &data->res.seq_res); 7675 7676 switch (task->tk_status) { 7677 case 0: 7678 renew_lease(server, data->timestamp); 7679 break; 7680 case -NFS4ERR_STALE_CLIENTID: 7681 case -NFS4ERR_EXPIRED: 7682 nfs4_schedule_lease_recovery(server->nfs_client); 7683 break; 7684 case -NFS4ERR_LEASE_MOVED: 7685 case -NFS4ERR_DELAY: 7686 if (nfs4_async_handle_error(task, server, 7687 NULL, NULL) == -EAGAIN) 7688 rpc_restart_call_prepare(task); 7689 } 7690 } 7691 7692 static void nfs4_release_lockowner_release(void *calldata) 7693 { 7694 struct nfs_release_lockowner_data *data = calldata; 7695 nfs4_free_lock_state(data->server, data->lsp); 7696 kfree(calldata); 7697 } 7698 7699 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7700 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7701 .rpc_call_done = nfs4_release_lockowner_done, 7702 .rpc_release = nfs4_release_lockowner_release, 7703 }; 7704 7705 static void 7706 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7707 { 7708 struct nfs_release_lockowner_data *data; 7709 struct rpc_message msg = { 7710 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7711 }; 7712 7713 if (server->nfs_client->cl_mvops->minor_version != 0) 7714 return; 7715 7716 data = kmalloc(sizeof(*data), GFP_KERNEL); 7717 if (!data) 7718 return; 7719 data->lsp = lsp; 7720 data->server = server; 7721 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7722 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7723 data->args.lock_owner.s_dev = server->s_dev; 7724 7725 msg.rpc_argp = &data->args; 7726 msg.rpc_resp = &data->res; 7727 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7728 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7729 } 7730 7731 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7732 7733 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7734 struct mnt_idmap *idmap, 7735 struct dentry *unused, struct inode *inode, 7736 const char *key, const void *buf, 7737 size_t buflen, int flags) 7738 { 7739 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7740 } 7741 7742 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7743 struct dentry *unused, struct inode *inode, 7744 const char *key, void *buf, size_t buflen) 7745 { 7746 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7747 } 7748 7749 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7750 { 7751 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7752 } 7753 7754 #if defined(CONFIG_NFS_V4_1) 7755 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7756 7757 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7758 struct mnt_idmap *idmap, 7759 struct dentry *unused, struct inode *inode, 7760 const char *key, const void *buf, 7761 size_t buflen, int flags) 7762 { 7763 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7764 } 7765 7766 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7767 struct dentry *unused, struct inode *inode, 7768 const char *key, void *buf, size_t buflen) 7769 { 7770 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7771 } 7772 7773 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7774 { 7775 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7776 } 7777 7778 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7779 7780 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7781 struct mnt_idmap *idmap, 7782 struct dentry *unused, struct inode *inode, 7783 const char *key, const void *buf, 7784 size_t buflen, int flags) 7785 { 7786 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7787 } 7788 7789 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7790 struct dentry *unused, struct inode *inode, 7791 const char *key, void *buf, size_t buflen) 7792 { 7793 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7794 } 7795 7796 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7797 { 7798 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7799 } 7800 7801 #endif 7802 7803 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7804 7805 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7806 struct mnt_idmap *idmap, 7807 struct dentry *unused, struct inode *inode, 7808 const char *key, const void *buf, 7809 size_t buflen, int flags) 7810 { 7811 if (security_ismaclabel(key)) 7812 return nfs4_set_security_label(inode, buf, buflen); 7813 7814 return -EOPNOTSUPP; 7815 } 7816 7817 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7818 struct dentry *unused, struct inode *inode, 7819 const char *key, void *buf, size_t buflen) 7820 { 7821 if (security_ismaclabel(key)) 7822 return nfs4_get_security_label(inode, buf, buflen); 7823 return -EOPNOTSUPP; 7824 } 7825 7826 static ssize_t 7827 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7828 { 7829 int len = 0; 7830 7831 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7832 len = security_inode_listsecurity(inode, list, list_len); 7833 if (len >= 0 && list_len && len > list_len) 7834 return -ERANGE; 7835 } 7836 return len; 7837 } 7838 7839 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7840 .prefix = XATTR_SECURITY_PREFIX, 7841 .get = nfs4_xattr_get_nfs4_label, 7842 .set = nfs4_xattr_set_nfs4_label, 7843 }; 7844 7845 #else 7846 7847 static ssize_t 7848 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7849 { 7850 return 0; 7851 } 7852 7853 #endif 7854 7855 #ifdef CONFIG_NFS_V4_2 7856 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7857 struct mnt_idmap *idmap, 7858 struct dentry *unused, struct inode *inode, 7859 const char *key, const void *buf, 7860 size_t buflen, int flags) 7861 { 7862 u32 mask; 7863 int ret; 7864 7865 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7866 return -EOPNOTSUPP; 7867 7868 /* 7869 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7870 * flags right now. Handling of xattr operations use the normal 7871 * file read/write permissions. 7872 * 7873 * Just in case the server has other ideas (which RFC 8276 allows), 7874 * do a cached access check for the XA* flags to possibly avoid 7875 * doing an RPC and getting EACCES back. 7876 */ 7877 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7878 if (!(mask & NFS_ACCESS_XAWRITE)) 7879 return -EACCES; 7880 } 7881 7882 if (buf == NULL) { 7883 ret = nfs42_proc_removexattr(inode, key); 7884 if (!ret) 7885 nfs4_xattr_cache_remove(inode, key); 7886 } else { 7887 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7888 if (!ret) 7889 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7890 } 7891 7892 return ret; 7893 } 7894 7895 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7896 struct dentry *unused, struct inode *inode, 7897 const char *key, void *buf, size_t buflen) 7898 { 7899 u32 mask; 7900 ssize_t ret; 7901 7902 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7903 return -EOPNOTSUPP; 7904 7905 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7906 if (!(mask & NFS_ACCESS_XAREAD)) 7907 return -EACCES; 7908 } 7909 7910 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7911 if (ret) 7912 return ret; 7913 7914 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7915 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7916 return ret; 7917 7918 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7919 7920 return ret; 7921 } 7922 7923 static ssize_t 7924 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7925 { 7926 u64 cookie; 7927 bool eof; 7928 ssize_t ret, size; 7929 char *buf; 7930 size_t buflen; 7931 u32 mask; 7932 7933 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7934 return 0; 7935 7936 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7937 if (!(mask & NFS_ACCESS_XALIST)) 7938 return 0; 7939 } 7940 7941 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7942 if (ret) 7943 return ret; 7944 7945 ret = nfs4_xattr_cache_list(inode, list, list_len); 7946 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7947 return ret; 7948 7949 cookie = 0; 7950 eof = false; 7951 buflen = list_len ? list_len : XATTR_LIST_MAX; 7952 buf = list_len ? list : NULL; 7953 size = 0; 7954 7955 while (!eof) { 7956 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7957 &cookie, &eof); 7958 if (ret < 0) 7959 return ret; 7960 7961 if (list_len) { 7962 buf += ret; 7963 buflen -= ret; 7964 } 7965 size += ret; 7966 } 7967 7968 if (list_len) 7969 nfs4_xattr_cache_set_list(inode, list, size); 7970 7971 return size; 7972 } 7973 7974 #else 7975 7976 static ssize_t 7977 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7978 { 7979 return 0; 7980 } 7981 #endif /* CONFIG_NFS_V4_2 */ 7982 7983 /* 7984 * nfs_fhget will use either the mounted_on_fileid or the fileid 7985 */ 7986 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7987 { 7988 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7989 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7990 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7991 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7992 return; 7993 7994 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7995 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7996 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7997 fattr->nlink = 2; 7998 } 7999 8000 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8001 const struct qstr *name, 8002 struct nfs4_fs_locations *fs_locations, 8003 struct page *page) 8004 { 8005 struct nfs_server *server = NFS_SERVER(dir); 8006 u32 bitmask[3]; 8007 struct nfs4_fs_locations_arg args = { 8008 .dir_fh = NFS_FH(dir), 8009 .name = name, 8010 .page = page, 8011 .bitmask = bitmask, 8012 }; 8013 struct nfs4_fs_locations_res res = { 8014 .fs_locations = fs_locations, 8015 }; 8016 struct rpc_message msg = { 8017 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8018 .rpc_argp = &args, 8019 .rpc_resp = &res, 8020 }; 8021 int status; 8022 8023 dprintk("%s: start\n", __func__); 8024 8025 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8026 bitmask[1] = nfs4_fattr_bitmap[1]; 8027 8028 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8029 * is not supported */ 8030 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8031 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8032 else 8033 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8034 8035 nfs_fattr_init(fs_locations->fattr); 8036 fs_locations->server = server; 8037 fs_locations->nlocations = 0; 8038 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8039 dprintk("%s: returned status = %d\n", __func__, status); 8040 return status; 8041 } 8042 8043 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8044 const struct qstr *name, 8045 struct nfs4_fs_locations *fs_locations, 8046 struct page *page) 8047 { 8048 struct nfs4_exception exception = { 8049 .interruptible = true, 8050 }; 8051 int err; 8052 do { 8053 err = _nfs4_proc_fs_locations(client, dir, name, 8054 fs_locations, page); 8055 trace_nfs4_get_fs_locations(dir, name, err); 8056 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8057 &exception); 8058 } while (exception.retry); 8059 return err; 8060 } 8061 8062 /* 8063 * This operation also signals the server that this client is 8064 * performing migration recovery. The server can stop returning 8065 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8066 * appended to this compound to identify the client ID which is 8067 * performing recovery. 8068 */ 8069 static int _nfs40_proc_get_locations(struct nfs_server *server, 8070 struct nfs_fh *fhandle, 8071 struct nfs4_fs_locations *locations, 8072 struct page *page, const struct cred *cred) 8073 { 8074 struct rpc_clnt *clnt = server->client; 8075 u32 bitmask[2] = { 8076 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8077 }; 8078 struct nfs4_fs_locations_arg args = { 8079 .clientid = server->nfs_client->cl_clientid, 8080 .fh = fhandle, 8081 .page = page, 8082 .bitmask = bitmask, 8083 .migration = 1, /* skip LOOKUP */ 8084 .renew = 1, /* append RENEW */ 8085 }; 8086 struct nfs4_fs_locations_res res = { 8087 .fs_locations = locations, 8088 .migration = 1, 8089 .renew = 1, 8090 }; 8091 struct rpc_message msg = { 8092 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8093 .rpc_argp = &args, 8094 .rpc_resp = &res, 8095 .rpc_cred = cred, 8096 }; 8097 unsigned long now = jiffies; 8098 int status; 8099 8100 nfs_fattr_init(locations->fattr); 8101 locations->server = server; 8102 locations->nlocations = 0; 8103 8104 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8105 status = nfs4_call_sync_sequence(clnt, server, &msg, 8106 &args.seq_args, &res.seq_res); 8107 if (status) 8108 return status; 8109 8110 renew_lease(server, now); 8111 return 0; 8112 } 8113 8114 #ifdef CONFIG_NFS_V4_1 8115 8116 /* 8117 * This operation also signals the server that this client is 8118 * performing migration recovery. The server can stop asserting 8119 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8120 * performing this operation is identified in the SEQUENCE 8121 * operation in this compound. 8122 * 8123 * When the client supports GETATTR(fs_locations_info), it can 8124 * be plumbed in here. 8125 */ 8126 static int _nfs41_proc_get_locations(struct nfs_server *server, 8127 struct nfs_fh *fhandle, 8128 struct nfs4_fs_locations *locations, 8129 struct page *page, const struct cred *cred) 8130 { 8131 struct rpc_clnt *clnt = server->client; 8132 u32 bitmask[2] = { 8133 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8134 }; 8135 struct nfs4_fs_locations_arg args = { 8136 .fh = fhandle, 8137 .page = page, 8138 .bitmask = bitmask, 8139 .migration = 1, /* skip LOOKUP */ 8140 }; 8141 struct nfs4_fs_locations_res res = { 8142 .fs_locations = locations, 8143 .migration = 1, 8144 }; 8145 struct rpc_message msg = { 8146 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8147 .rpc_argp = &args, 8148 .rpc_resp = &res, 8149 .rpc_cred = cred, 8150 }; 8151 struct nfs4_call_sync_data data = { 8152 .seq_server = server, 8153 .seq_args = &args.seq_args, 8154 .seq_res = &res.seq_res, 8155 }; 8156 struct rpc_task_setup task_setup_data = { 8157 .rpc_client = clnt, 8158 .rpc_message = &msg, 8159 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8160 .callback_data = &data, 8161 .flags = RPC_TASK_NO_ROUND_ROBIN, 8162 }; 8163 int status; 8164 8165 nfs_fattr_init(locations->fattr); 8166 locations->server = server; 8167 locations->nlocations = 0; 8168 8169 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8170 status = nfs4_call_sync_custom(&task_setup_data); 8171 if (status == NFS4_OK && 8172 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8173 status = -NFS4ERR_LEASE_MOVED; 8174 return status; 8175 } 8176 8177 #endif /* CONFIG_NFS_V4_1 */ 8178 8179 /** 8180 * nfs4_proc_get_locations - discover locations for a migrated FSID 8181 * @server: pointer to nfs_server to process 8182 * @fhandle: pointer to the kernel NFS client file handle 8183 * @locations: result of query 8184 * @page: buffer 8185 * @cred: credential to use for this operation 8186 * 8187 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8188 * operation failed, or a negative errno if a local error occurred. 8189 * 8190 * On success, "locations" is filled in, but if the server has 8191 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8192 * asserted. 8193 * 8194 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8195 * from this client that require migration recovery. 8196 */ 8197 int nfs4_proc_get_locations(struct nfs_server *server, 8198 struct nfs_fh *fhandle, 8199 struct nfs4_fs_locations *locations, 8200 struct page *page, const struct cred *cred) 8201 { 8202 struct nfs_client *clp = server->nfs_client; 8203 const struct nfs4_mig_recovery_ops *ops = 8204 clp->cl_mvops->mig_recovery_ops; 8205 struct nfs4_exception exception = { 8206 .interruptible = true, 8207 }; 8208 int status; 8209 8210 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8211 (unsigned long long)server->fsid.major, 8212 (unsigned long long)server->fsid.minor, 8213 clp->cl_hostname); 8214 nfs_display_fhandle(fhandle, __func__); 8215 8216 do { 8217 status = ops->get_locations(server, fhandle, locations, page, 8218 cred); 8219 if (status != -NFS4ERR_DELAY) 8220 break; 8221 nfs4_handle_exception(server, status, &exception); 8222 } while (exception.retry); 8223 return status; 8224 } 8225 8226 /* 8227 * This operation also signals the server that this client is 8228 * performing "lease moved" recovery. The server can stop 8229 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8230 * is appended to this compound to identify the client ID which is 8231 * performing recovery. 8232 */ 8233 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8234 { 8235 struct nfs_server *server = NFS_SERVER(inode); 8236 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8237 struct rpc_clnt *clnt = server->client; 8238 struct nfs4_fsid_present_arg args = { 8239 .fh = NFS_FH(inode), 8240 .clientid = clp->cl_clientid, 8241 .renew = 1, /* append RENEW */ 8242 }; 8243 struct nfs4_fsid_present_res res = { 8244 .renew = 1, 8245 }; 8246 struct rpc_message msg = { 8247 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8248 .rpc_argp = &args, 8249 .rpc_resp = &res, 8250 .rpc_cred = cred, 8251 }; 8252 unsigned long now = jiffies; 8253 int status; 8254 8255 res.fh = nfs_alloc_fhandle(); 8256 if (res.fh == NULL) 8257 return -ENOMEM; 8258 8259 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8260 status = nfs4_call_sync_sequence(clnt, server, &msg, 8261 &args.seq_args, &res.seq_res); 8262 nfs_free_fhandle(res.fh); 8263 if (status) 8264 return status; 8265 8266 do_renew_lease(clp, now); 8267 return 0; 8268 } 8269 8270 #ifdef CONFIG_NFS_V4_1 8271 8272 /* 8273 * This operation also signals the server that this client is 8274 * performing "lease moved" recovery. The server can stop asserting 8275 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8276 * this operation is identified in the SEQUENCE operation in this 8277 * compound. 8278 */ 8279 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8280 { 8281 struct nfs_server *server = NFS_SERVER(inode); 8282 struct rpc_clnt *clnt = server->client; 8283 struct nfs4_fsid_present_arg args = { 8284 .fh = NFS_FH(inode), 8285 }; 8286 struct nfs4_fsid_present_res res = { 8287 }; 8288 struct rpc_message msg = { 8289 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8290 .rpc_argp = &args, 8291 .rpc_resp = &res, 8292 .rpc_cred = cred, 8293 }; 8294 int status; 8295 8296 res.fh = nfs_alloc_fhandle(); 8297 if (res.fh == NULL) 8298 return -ENOMEM; 8299 8300 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8301 status = nfs4_call_sync_sequence(clnt, server, &msg, 8302 &args.seq_args, &res.seq_res); 8303 nfs_free_fhandle(res.fh); 8304 if (status == NFS4_OK && 8305 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8306 status = -NFS4ERR_LEASE_MOVED; 8307 return status; 8308 } 8309 8310 #endif /* CONFIG_NFS_V4_1 */ 8311 8312 /** 8313 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8314 * @inode: inode on FSID to check 8315 * @cred: credential to use for this operation 8316 * 8317 * Server indicates whether the FSID is present, moved, or not 8318 * recognized. This operation is necessary to clear a LEASE_MOVED 8319 * condition for this client ID. 8320 * 8321 * Returns NFS4_OK if the FSID is present on this server, 8322 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8323 * NFS4ERR code if some error occurred on the server, or a 8324 * negative errno if a local failure occurred. 8325 */ 8326 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8327 { 8328 struct nfs_server *server = NFS_SERVER(inode); 8329 struct nfs_client *clp = server->nfs_client; 8330 const struct nfs4_mig_recovery_ops *ops = 8331 clp->cl_mvops->mig_recovery_ops; 8332 struct nfs4_exception exception = { 8333 .interruptible = true, 8334 }; 8335 int status; 8336 8337 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8338 (unsigned long long)server->fsid.major, 8339 (unsigned long long)server->fsid.minor, 8340 clp->cl_hostname); 8341 nfs_display_fhandle(NFS_FH(inode), __func__); 8342 8343 do { 8344 status = ops->fsid_present(inode, cred); 8345 if (status != -NFS4ERR_DELAY) 8346 break; 8347 nfs4_handle_exception(server, status, &exception); 8348 } while (exception.retry); 8349 return status; 8350 } 8351 8352 /* 8353 * If 'use_integrity' is true and the state managment nfs_client 8354 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8355 * and the machine credential as per RFC3530bis and RFC5661 Security 8356 * Considerations sections. Otherwise, just use the user cred with the 8357 * filesystem's rpc_client. 8358 */ 8359 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8360 { 8361 int status; 8362 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8363 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8364 struct nfs4_secinfo_arg args = { 8365 .dir_fh = NFS_FH(dir), 8366 .name = name, 8367 }; 8368 struct nfs4_secinfo_res res = { 8369 .flavors = flavors, 8370 }; 8371 struct rpc_message msg = { 8372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8373 .rpc_argp = &args, 8374 .rpc_resp = &res, 8375 }; 8376 struct nfs4_call_sync_data data = { 8377 .seq_server = NFS_SERVER(dir), 8378 .seq_args = &args.seq_args, 8379 .seq_res = &res.seq_res, 8380 }; 8381 struct rpc_task_setup task_setup = { 8382 .rpc_client = clnt, 8383 .rpc_message = &msg, 8384 .callback_ops = clp->cl_mvops->call_sync_ops, 8385 .callback_data = &data, 8386 .flags = RPC_TASK_NO_ROUND_ROBIN, 8387 }; 8388 const struct cred *cred = NULL; 8389 8390 if (use_integrity) { 8391 clnt = clp->cl_rpcclient; 8392 task_setup.rpc_client = clnt; 8393 8394 cred = nfs4_get_clid_cred(clp); 8395 msg.rpc_cred = cred; 8396 } 8397 8398 dprintk("NFS call secinfo %s\n", name->name); 8399 8400 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8401 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8402 status = nfs4_call_sync_custom(&task_setup); 8403 8404 dprintk("NFS reply secinfo: %d\n", status); 8405 8406 put_cred(cred); 8407 return status; 8408 } 8409 8410 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8411 struct nfs4_secinfo_flavors *flavors) 8412 { 8413 struct nfs4_exception exception = { 8414 .interruptible = true, 8415 }; 8416 int err; 8417 do { 8418 err = -NFS4ERR_WRONGSEC; 8419 8420 /* try to use integrity protection with machine cred */ 8421 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8422 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8423 8424 /* 8425 * if unable to use integrity protection, or SECINFO with 8426 * integrity protection returns NFS4ERR_WRONGSEC (which is 8427 * disallowed by spec, but exists in deployed servers) use 8428 * the current filesystem's rpc_client and the user cred. 8429 */ 8430 if (err == -NFS4ERR_WRONGSEC) 8431 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8432 8433 trace_nfs4_secinfo(dir, name, err); 8434 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8435 &exception); 8436 } while (exception.retry); 8437 return err; 8438 } 8439 8440 #ifdef CONFIG_NFS_V4_1 8441 /* 8442 * Check the exchange flags returned by the server for invalid flags, having 8443 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8444 * DS flags set. 8445 */ 8446 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8447 { 8448 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8449 goto out_inval; 8450 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8451 goto out_inval; 8452 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8453 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8454 goto out_inval; 8455 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8456 goto out_inval; 8457 return NFS_OK; 8458 out_inval: 8459 return -NFS4ERR_INVAL; 8460 } 8461 8462 static bool 8463 nfs41_same_server_scope(struct nfs41_server_scope *a, 8464 struct nfs41_server_scope *b) 8465 { 8466 if (a->server_scope_sz != b->server_scope_sz) 8467 return false; 8468 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8469 } 8470 8471 static void 8472 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8473 { 8474 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8475 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8476 struct nfs_client *clp = args->client; 8477 8478 switch (task->tk_status) { 8479 case -NFS4ERR_BADSESSION: 8480 case -NFS4ERR_DEADSESSION: 8481 nfs4_schedule_session_recovery(clp->cl_session, 8482 task->tk_status); 8483 return; 8484 } 8485 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8486 res->dir != NFS4_CDFS4_BOTH) { 8487 rpc_task_close_connection(task); 8488 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8489 rpc_restart_call(task); 8490 } 8491 } 8492 8493 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8494 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8495 }; 8496 8497 /* 8498 * nfs4_proc_bind_one_conn_to_session() 8499 * 8500 * The 4.1 client currently uses the same TCP connection for the 8501 * fore and backchannel. 8502 */ 8503 static 8504 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8505 struct rpc_xprt *xprt, 8506 struct nfs_client *clp, 8507 const struct cred *cred) 8508 { 8509 int status; 8510 struct nfs41_bind_conn_to_session_args args = { 8511 .client = clp, 8512 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8513 .retries = 0, 8514 }; 8515 struct nfs41_bind_conn_to_session_res res; 8516 struct rpc_message msg = { 8517 .rpc_proc = 8518 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8519 .rpc_argp = &args, 8520 .rpc_resp = &res, 8521 .rpc_cred = cred, 8522 }; 8523 struct rpc_task_setup task_setup_data = { 8524 .rpc_client = clnt, 8525 .rpc_xprt = xprt, 8526 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8527 .rpc_message = &msg, 8528 .flags = RPC_TASK_TIMEOUT, 8529 }; 8530 struct rpc_task *task; 8531 8532 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8533 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8534 args.dir = NFS4_CDFC4_FORE; 8535 8536 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8537 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8538 args.dir = NFS4_CDFC4_FORE; 8539 8540 task = rpc_run_task(&task_setup_data); 8541 if (!IS_ERR(task)) { 8542 status = task->tk_status; 8543 rpc_put_task(task); 8544 } else 8545 status = PTR_ERR(task); 8546 trace_nfs4_bind_conn_to_session(clp, status); 8547 if (status == 0) { 8548 if (memcmp(res.sessionid.data, 8549 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8550 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8551 return -EIO; 8552 } 8553 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8554 dprintk("NFS: %s: Unexpected direction from server\n", 8555 __func__); 8556 return -EIO; 8557 } 8558 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8559 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8560 __func__); 8561 return -EIO; 8562 } 8563 } 8564 8565 return status; 8566 } 8567 8568 struct rpc_bind_conn_calldata { 8569 struct nfs_client *clp; 8570 const struct cred *cred; 8571 }; 8572 8573 static int 8574 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8575 struct rpc_xprt *xprt, 8576 void *calldata) 8577 { 8578 struct rpc_bind_conn_calldata *p = calldata; 8579 8580 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8581 } 8582 8583 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8584 { 8585 struct rpc_bind_conn_calldata data = { 8586 .clp = clp, 8587 .cred = cred, 8588 }; 8589 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8590 nfs4_proc_bind_conn_to_session_callback, &data); 8591 } 8592 8593 /* 8594 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8595 * and operations we'd like to see to enable certain features in the allow map 8596 */ 8597 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8598 .how = SP4_MACH_CRED, 8599 .enforce.u.words = { 8600 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8601 1 << (OP_EXCHANGE_ID - 32) | 8602 1 << (OP_CREATE_SESSION - 32) | 8603 1 << (OP_DESTROY_SESSION - 32) | 8604 1 << (OP_DESTROY_CLIENTID - 32) 8605 }, 8606 .allow.u.words = { 8607 [0] = 1 << (OP_CLOSE) | 8608 1 << (OP_OPEN_DOWNGRADE) | 8609 1 << (OP_LOCKU) | 8610 1 << (OP_DELEGRETURN) | 8611 1 << (OP_COMMIT), 8612 [1] = 1 << (OP_SECINFO - 32) | 8613 1 << (OP_SECINFO_NO_NAME - 32) | 8614 1 << (OP_LAYOUTRETURN - 32) | 8615 1 << (OP_TEST_STATEID - 32) | 8616 1 << (OP_FREE_STATEID - 32) | 8617 1 << (OP_WRITE - 32) 8618 } 8619 }; 8620 8621 /* 8622 * Select the state protection mode for client `clp' given the server results 8623 * from exchange_id in `sp'. 8624 * 8625 * Returns 0 on success, negative errno otherwise. 8626 */ 8627 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8628 struct nfs41_state_protection *sp) 8629 { 8630 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8631 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8632 1 << (OP_EXCHANGE_ID - 32) | 8633 1 << (OP_CREATE_SESSION - 32) | 8634 1 << (OP_DESTROY_SESSION - 32) | 8635 1 << (OP_DESTROY_CLIENTID - 32) 8636 }; 8637 unsigned long flags = 0; 8638 unsigned int i; 8639 int ret = 0; 8640 8641 if (sp->how == SP4_MACH_CRED) { 8642 /* Print state protect result */ 8643 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8644 for (i = 0; i <= LAST_NFS4_OP; i++) { 8645 if (test_bit(i, sp->enforce.u.longs)) 8646 dfprintk(MOUNT, " enforce op %d\n", i); 8647 if (test_bit(i, sp->allow.u.longs)) 8648 dfprintk(MOUNT, " allow op %d\n", i); 8649 } 8650 8651 /* make sure nothing is on enforce list that isn't supported */ 8652 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8653 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8654 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8655 ret = -EINVAL; 8656 goto out; 8657 } 8658 } 8659 8660 /* 8661 * Minimal mode - state operations are allowed to use machine 8662 * credential. Note this already happens by default, so the 8663 * client doesn't have to do anything more than the negotiation. 8664 * 8665 * NOTE: we don't care if EXCHANGE_ID is in the list - 8666 * we're already using the machine cred for exchange_id 8667 * and will never use a different cred. 8668 */ 8669 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8670 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8671 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8672 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8673 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8674 dfprintk(MOUNT, " minimal mode enabled\n"); 8675 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8676 } else { 8677 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8678 ret = -EINVAL; 8679 goto out; 8680 } 8681 8682 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8683 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8684 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8685 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8686 dfprintk(MOUNT, " cleanup mode enabled\n"); 8687 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8688 } 8689 8690 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8691 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8692 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8693 } 8694 8695 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8696 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8697 dfprintk(MOUNT, " secinfo mode enabled\n"); 8698 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8699 } 8700 8701 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8702 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8703 dfprintk(MOUNT, " stateid mode enabled\n"); 8704 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8705 } 8706 8707 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8708 dfprintk(MOUNT, " write mode enabled\n"); 8709 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8710 } 8711 8712 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8713 dfprintk(MOUNT, " commit mode enabled\n"); 8714 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8715 } 8716 } 8717 out: 8718 clp->cl_sp4_flags = flags; 8719 return ret; 8720 } 8721 8722 struct nfs41_exchange_id_data { 8723 struct nfs41_exchange_id_res res; 8724 struct nfs41_exchange_id_args args; 8725 }; 8726 8727 static void nfs4_exchange_id_release(void *data) 8728 { 8729 struct nfs41_exchange_id_data *cdata = 8730 (struct nfs41_exchange_id_data *)data; 8731 8732 nfs_put_client(cdata->args.client); 8733 kfree(cdata->res.impl_id); 8734 kfree(cdata->res.server_scope); 8735 kfree(cdata->res.server_owner); 8736 kfree(cdata); 8737 } 8738 8739 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8740 .rpc_release = nfs4_exchange_id_release, 8741 }; 8742 8743 /* 8744 * _nfs4_proc_exchange_id() 8745 * 8746 * Wrapper for EXCHANGE_ID operation. 8747 */ 8748 static struct rpc_task * 8749 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8750 u32 sp4_how, struct rpc_xprt *xprt) 8751 { 8752 struct rpc_message msg = { 8753 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8754 .rpc_cred = cred, 8755 }; 8756 struct rpc_task_setup task_setup_data = { 8757 .rpc_client = clp->cl_rpcclient, 8758 .callback_ops = &nfs4_exchange_id_call_ops, 8759 .rpc_message = &msg, 8760 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8761 }; 8762 struct nfs41_exchange_id_data *calldata; 8763 int status; 8764 8765 if (!refcount_inc_not_zero(&clp->cl_count)) 8766 return ERR_PTR(-EIO); 8767 8768 status = -ENOMEM; 8769 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8770 if (!calldata) 8771 goto out; 8772 8773 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8774 8775 status = nfs4_init_uniform_client_string(clp); 8776 if (status) 8777 goto out_calldata; 8778 8779 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8780 GFP_NOFS); 8781 status = -ENOMEM; 8782 if (unlikely(calldata->res.server_owner == NULL)) 8783 goto out_calldata; 8784 8785 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8786 GFP_NOFS); 8787 if (unlikely(calldata->res.server_scope == NULL)) 8788 goto out_server_owner; 8789 8790 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8791 if (unlikely(calldata->res.impl_id == NULL)) 8792 goto out_server_scope; 8793 8794 switch (sp4_how) { 8795 case SP4_NONE: 8796 calldata->args.state_protect.how = SP4_NONE; 8797 break; 8798 8799 case SP4_MACH_CRED: 8800 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8801 break; 8802 8803 default: 8804 /* unsupported! */ 8805 WARN_ON_ONCE(1); 8806 status = -EINVAL; 8807 goto out_impl_id; 8808 } 8809 if (xprt) { 8810 task_setup_data.rpc_xprt = xprt; 8811 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8812 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8813 sizeof(calldata->args.verifier.data)); 8814 } 8815 calldata->args.client = clp; 8816 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8817 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8818 #ifdef CONFIG_NFS_V4_1_MIGRATION 8819 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8820 #endif 8821 if (test_bit(NFS_CS_PNFS, &clp->cl_flags)) 8822 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8823 msg.rpc_argp = &calldata->args; 8824 msg.rpc_resp = &calldata->res; 8825 task_setup_data.callback_data = calldata; 8826 8827 return rpc_run_task(&task_setup_data); 8828 8829 out_impl_id: 8830 kfree(calldata->res.impl_id); 8831 out_server_scope: 8832 kfree(calldata->res.server_scope); 8833 out_server_owner: 8834 kfree(calldata->res.server_owner); 8835 out_calldata: 8836 kfree(calldata); 8837 out: 8838 nfs_put_client(clp); 8839 return ERR_PTR(status); 8840 } 8841 8842 /* 8843 * _nfs4_proc_exchange_id() 8844 * 8845 * Wrapper for EXCHANGE_ID operation. 8846 */ 8847 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8848 u32 sp4_how) 8849 { 8850 struct rpc_task *task; 8851 struct nfs41_exchange_id_args *argp; 8852 struct nfs41_exchange_id_res *resp; 8853 unsigned long now = jiffies; 8854 int status; 8855 8856 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8857 if (IS_ERR(task)) 8858 return PTR_ERR(task); 8859 8860 argp = task->tk_msg.rpc_argp; 8861 resp = task->tk_msg.rpc_resp; 8862 status = task->tk_status; 8863 if (status != 0) 8864 goto out; 8865 8866 status = nfs4_check_cl_exchange_flags(resp->flags, 8867 clp->cl_mvops->minor_version); 8868 if (status != 0) 8869 goto out; 8870 8871 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8872 if (status != 0) 8873 goto out; 8874 8875 do_renew_lease(clp, now); 8876 8877 clp->cl_clientid = resp->clientid; 8878 clp->cl_exchange_flags = resp->flags; 8879 clp->cl_seqid = resp->seqid; 8880 /* Client ID is not confirmed */ 8881 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8882 clear_bit(NFS4_SESSION_ESTABLISHED, 8883 &clp->cl_session->session_state); 8884 8885 if (clp->cl_serverscope != NULL && 8886 !nfs41_same_server_scope(clp->cl_serverscope, 8887 resp->server_scope)) { 8888 dprintk("%s: server_scope mismatch detected\n", 8889 __func__); 8890 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8891 } 8892 8893 swap(clp->cl_serverowner, resp->server_owner); 8894 swap(clp->cl_serverscope, resp->server_scope); 8895 swap(clp->cl_implid, resp->impl_id); 8896 8897 /* Save the EXCHANGE_ID verifier session trunk tests */ 8898 memcpy(clp->cl_confirm.data, argp->verifier.data, 8899 sizeof(clp->cl_confirm.data)); 8900 out: 8901 trace_nfs4_exchange_id(clp, status); 8902 rpc_put_task(task); 8903 return status; 8904 } 8905 8906 /* 8907 * nfs4_proc_exchange_id() 8908 * 8909 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8910 * 8911 * Since the clientid has expired, all compounds using sessions 8912 * associated with the stale clientid will be returning 8913 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8914 * be in some phase of session reset. 8915 * 8916 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8917 */ 8918 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8919 { 8920 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8921 int status; 8922 8923 /* try SP4_MACH_CRED if krb5i/p */ 8924 if (authflavor == RPC_AUTH_GSS_KRB5I || 8925 authflavor == RPC_AUTH_GSS_KRB5P) { 8926 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8927 if (!status) 8928 return 0; 8929 } 8930 8931 /* try SP4_NONE */ 8932 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8933 } 8934 8935 /** 8936 * nfs4_test_session_trunk 8937 * 8938 * This is an add_xprt_test() test function called from 8939 * rpc_clnt_setup_test_and_add_xprt. 8940 * 8941 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8942 * and is dereferrenced in nfs4_exchange_id_release 8943 * 8944 * Upon success, add the new transport to the rpc_clnt 8945 * 8946 * @clnt: struct rpc_clnt to get new transport 8947 * @xprt: the rpc_xprt to test 8948 * @data: call data for _nfs4_proc_exchange_id. 8949 */ 8950 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8951 void *data) 8952 { 8953 struct nfs4_add_xprt_data *adata = data; 8954 struct rpc_task *task; 8955 int status; 8956 8957 u32 sp4_how; 8958 8959 dprintk("--> %s try %s\n", __func__, 8960 xprt->address_strings[RPC_DISPLAY_ADDR]); 8961 8962 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8963 8964 try_again: 8965 /* Test connection for session trunking. Async exchange_id call */ 8966 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8967 if (IS_ERR(task)) 8968 return; 8969 8970 status = task->tk_status; 8971 if (status == 0) 8972 status = nfs4_detect_session_trunking(adata->clp, 8973 task->tk_msg.rpc_resp, xprt); 8974 8975 if (status == 0) 8976 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8977 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt, 8978 (struct sockaddr *)&xprt->addr)) 8979 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8980 8981 rpc_put_task(task); 8982 if (status == -NFS4ERR_DELAY) { 8983 ssleep(1); 8984 goto try_again; 8985 } 8986 } 8987 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8988 8989 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8990 const struct cred *cred) 8991 { 8992 struct rpc_message msg = { 8993 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8994 .rpc_argp = clp, 8995 .rpc_cred = cred, 8996 }; 8997 int status; 8998 8999 status = rpc_call_sync(clp->cl_rpcclient, &msg, 9000 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9001 trace_nfs4_destroy_clientid(clp, status); 9002 if (status) 9003 dprintk("NFS: Got error %d from the server %s on " 9004 "DESTROY_CLIENTID.", status, clp->cl_hostname); 9005 return status; 9006 } 9007 9008 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 9009 const struct cred *cred) 9010 { 9011 unsigned int loop; 9012 int ret; 9013 9014 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 9015 ret = _nfs4_proc_destroy_clientid(clp, cred); 9016 switch (ret) { 9017 case -NFS4ERR_DELAY: 9018 case -NFS4ERR_CLIENTID_BUSY: 9019 ssleep(1); 9020 break; 9021 default: 9022 return ret; 9023 } 9024 } 9025 return 0; 9026 } 9027 9028 int nfs4_destroy_clientid(struct nfs_client *clp) 9029 { 9030 const struct cred *cred; 9031 int ret = 0; 9032 9033 if (clp->cl_mvops->minor_version < 1) 9034 goto out; 9035 if (clp->cl_exchange_flags == 0) 9036 goto out; 9037 if (clp->cl_preserve_clid) 9038 goto out; 9039 cred = nfs4_get_clid_cred(clp); 9040 ret = nfs4_proc_destroy_clientid(clp, cred); 9041 put_cred(cred); 9042 switch (ret) { 9043 case 0: 9044 case -NFS4ERR_STALE_CLIENTID: 9045 clp->cl_exchange_flags = 0; 9046 } 9047 out: 9048 return ret; 9049 } 9050 9051 #endif /* CONFIG_NFS_V4_1 */ 9052 9053 struct nfs4_get_lease_time_data { 9054 struct nfs4_get_lease_time_args *args; 9055 struct nfs4_get_lease_time_res *res; 9056 struct nfs_client *clp; 9057 }; 9058 9059 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9060 void *calldata) 9061 { 9062 struct nfs4_get_lease_time_data *data = 9063 (struct nfs4_get_lease_time_data *)calldata; 9064 9065 /* just setup sequence, do not trigger session recovery 9066 since we're invoked within one */ 9067 nfs4_setup_sequence(data->clp, 9068 &data->args->la_seq_args, 9069 &data->res->lr_seq_res, 9070 task); 9071 } 9072 9073 /* 9074 * Called from nfs4_state_manager thread for session setup, so don't recover 9075 * from sequence operation or clientid errors. 9076 */ 9077 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9078 { 9079 struct nfs4_get_lease_time_data *data = 9080 (struct nfs4_get_lease_time_data *)calldata; 9081 9082 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9083 return; 9084 switch (task->tk_status) { 9085 case -NFS4ERR_DELAY: 9086 case -NFS4ERR_GRACE: 9087 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9088 task->tk_status = 0; 9089 fallthrough; 9090 case -NFS4ERR_RETRY_UNCACHED_REP: 9091 rpc_restart_call_prepare(task); 9092 return; 9093 } 9094 } 9095 9096 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9097 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9098 .rpc_call_done = nfs4_get_lease_time_done, 9099 }; 9100 9101 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9102 { 9103 struct nfs4_get_lease_time_args args; 9104 struct nfs4_get_lease_time_res res = { 9105 .lr_fsinfo = fsinfo, 9106 }; 9107 struct nfs4_get_lease_time_data data = { 9108 .args = &args, 9109 .res = &res, 9110 .clp = clp, 9111 }; 9112 struct rpc_message msg = { 9113 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9114 .rpc_argp = &args, 9115 .rpc_resp = &res, 9116 }; 9117 struct rpc_task_setup task_setup = { 9118 .rpc_client = clp->cl_rpcclient, 9119 .rpc_message = &msg, 9120 .callback_ops = &nfs4_get_lease_time_ops, 9121 .callback_data = &data, 9122 .flags = RPC_TASK_TIMEOUT, 9123 }; 9124 9125 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9126 return nfs4_call_sync_custom(&task_setup); 9127 } 9128 9129 #ifdef CONFIG_NFS_V4_1 9130 9131 /* 9132 * Initialize the values to be used by the client in CREATE_SESSION 9133 * If nfs4_init_session set the fore channel request and response sizes, 9134 * use them. 9135 * 9136 * Set the back channel max_resp_sz_cached to zero to force the client to 9137 * always set csa_cachethis to FALSE because the current implementation 9138 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9139 */ 9140 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9141 struct rpc_clnt *clnt) 9142 { 9143 unsigned int max_rqst_sz, max_resp_sz; 9144 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9145 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9146 9147 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9148 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9149 9150 /* Fore channel attributes */ 9151 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9152 args->fc_attrs.max_resp_sz = max_resp_sz; 9153 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9154 args->fc_attrs.max_reqs = max_session_slots; 9155 9156 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9157 "max_ops=%u max_reqs=%u\n", 9158 __func__, 9159 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9160 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9161 9162 /* Back channel attributes */ 9163 args->bc_attrs.max_rqst_sz = max_bc_payload; 9164 args->bc_attrs.max_resp_sz = max_bc_payload; 9165 args->bc_attrs.max_resp_sz_cached = 0; 9166 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9167 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9168 if (args->bc_attrs.max_reqs > max_bc_slots) 9169 args->bc_attrs.max_reqs = max_bc_slots; 9170 9171 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9172 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9173 __func__, 9174 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9175 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9176 args->bc_attrs.max_reqs); 9177 } 9178 9179 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9180 struct nfs41_create_session_res *res) 9181 { 9182 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9183 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9184 9185 if (rcvd->max_resp_sz > sent->max_resp_sz) 9186 return -EINVAL; 9187 /* 9188 * Our requested max_ops is the minimum we need; we're not 9189 * prepared to break up compounds into smaller pieces than that. 9190 * So, no point even trying to continue if the server won't 9191 * cooperate: 9192 */ 9193 if (rcvd->max_ops < sent->max_ops) 9194 return -EINVAL; 9195 if (rcvd->max_reqs == 0) 9196 return -EINVAL; 9197 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9198 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9199 return 0; 9200 } 9201 9202 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9203 struct nfs41_create_session_res *res) 9204 { 9205 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9206 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9207 9208 if (!(res->flags & SESSION4_BACK_CHAN)) 9209 goto out; 9210 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9211 return -EINVAL; 9212 if (rcvd->max_resp_sz < sent->max_resp_sz) 9213 return -EINVAL; 9214 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9215 return -EINVAL; 9216 if (rcvd->max_ops > sent->max_ops) 9217 return -EINVAL; 9218 if (rcvd->max_reqs > sent->max_reqs) 9219 return -EINVAL; 9220 out: 9221 return 0; 9222 } 9223 9224 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9225 struct nfs41_create_session_res *res) 9226 { 9227 int ret; 9228 9229 ret = nfs4_verify_fore_channel_attrs(args, res); 9230 if (ret) 9231 return ret; 9232 return nfs4_verify_back_channel_attrs(args, res); 9233 } 9234 9235 static void nfs4_update_session(struct nfs4_session *session, 9236 struct nfs41_create_session_res *res) 9237 { 9238 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9239 /* Mark client id and session as being confirmed */ 9240 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9241 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9242 session->flags = res->flags; 9243 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9244 if (res->flags & SESSION4_BACK_CHAN) 9245 memcpy(&session->bc_attrs, &res->bc_attrs, 9246 sizeof(session->bc_attrs)); 9247 } 9248 9249 static int _nfs4_proc_create_session(struct nfs_client *clp, 9250 const struct cred *cred) 9251 { 9252 struct nfs4_session *session = clp->cl_session; 9253 struct nfs41_create_session_args args = { 9254 .client = clp, 9255 .clientid = clp->cl_clientid, 9256 .seqid = clp->cl_seqid, 9257 .cb_program = NFS4_CALLBACK, 9258 }; 9259 struct nfs41_create_session_res res; 9260 9261 struct rpc_message msg = { 9262 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9263 .rpc_argp = &args, 9264 .rpc_resp = &res, 9265 .rpc_cred = cred, 9266 }; 9267 int status; 9268 9269 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9270 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9271 9272 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9273 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9274 trace_nfs4_create_session(clp, status); 9275 9276 switch (status) { 9277 case -NFS4ERR_STALE_CLIENTID: 9278 case -NFS4ERR_DELAY: 9279 case -ETIMEDOUT: 9280 case -EACCES: 9281 case -EAGAIN: 9282 goto out; 9283 } 9284 9285 clp->cl_seqid++; 9286 if (!status) { 9287 /* Verify the session's negotiated channel_attrs values */ 9288 status = nfs4_verify_channel_attrs(&args, &res); 9289 /* Increment the clientid slot sequence id */ 9290 if (status) 9291 goto out; 9292 nfs4_update_session(session, &res); 9293 } 9294 out: 9295 return status; 9296 } 9297 9298 /* 9299 * Issues a CREATE_SESSION operation to the server. 9300 * It is the responsibility of the caller to verify the session is 9301 * expired before calling this routine. 9302 */ 9303 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9304 { 9305 int status; 9306 unsigned *ptr; 9307 struct nfs4_session *session = clp->cl_session; 9308 struct nfs4_add_xprt_data xprtdata = { 9309 .clp = clp, 9310 }; 9311 struct rpc_add_xprt_test rpcdata = { 9312 .add_xprt_test = clp->cl_mvops->session_trunk, 9313 .data = &xprtdata, 9314 }; 9315 9316 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9317 9318 status = _nfs4_proc_create_session(clp, cred); 9319 if (status) 9320 goto out; 9321 9322 /* Init or reset the session slot tables */ 9323 status = nfs4_setup_session_slot_tables(session); 9324 dprintk("slot table setup returned %d\n", status); 9325 if (status) 9326 goto out; 9327 9328 ptr = (unsigned *)&session->sess_id.data[0]; 9329 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9330 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9331 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9332 out: 9333 return status; 9334 } 9335 9336 /* 9337 * Issue the over-the-wire RPC DESTROY_SESSION. 9338 * The caller must serialize access to this routine. 9339 */ 9340 int nfs4_proc_destroy_session(struct nfs4_session *session, 9341 const struct cred *cred) 9342 { 9343 struct rpc_message msg = { 9344 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9345 .rpc_argp = session, 9346 .rpc_cred = cred, 9347 }; 9348 int status = 0; 9349 9350 /* session is still being setup */ 9351 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9352 return 0; 9353 9354 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9355 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9356 trace_nfs4_destroy_session(session->clp, status); 9357 9358 if (status) 9359 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9360 "Session has been destroyed regardless...\n", status); 9361 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9362 return status; 9363 } 9364 9365 /* 9366 * Renew the cl_session lease. 9367 */ 9368 struct nfs4_sequence_data { 9369 struct nfs_client *clp; 9370 struct nfs4_sequence_args args; 9371 struct nfs4_sequence_res res; 9372 }; 9373 9374 static void nfs41_sequence_release(void *data) 9375 { 9376 struct nfs4_sequence_data *calldata = data; 9377 struct nfs_client *clp = calldata->clp; 9378 9379 if (refcount_read(&clp->cl_count) > 1) 9380 nfs4_schedule_state_renewal(clp); 9381 nfs_put_client(clp); 9382 kfree(calldata); 9383 } 9384 9385 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9386 { 9387 switch(task->tk_status) { 9388 case -NFS4ERR_DELAY: 9389 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9390 return -EAGAIN; 9391 default: 9392 nfs4_schedule_lease_recovery(clp); 9393 } 9394 return 0; 9395 } 9396 9397 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9398 { 9399 struct nfs4_sequence_data *calldata = data; 9400 struct nfs_client *clp = calldata->clp; 9401 9402 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9403 return; 9404 9405 trace_nfs4_sequence(clp, task->tk_status); 9406 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9407 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9408 if (refcount_read(&clp->cl_count) == 1) 9409 return; 9410 9411 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9412 rpc_restart_call_prepare(task); 9413 return; 9414 } 9415 } 9416 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9417 } 9418 9419 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9420 { 9421 struct nfs4_sequence_data *calldata = data; 9422 struct nfs_client *clp = calldata->clp; 9423 struct nfs4_sequence_args *args; 9424 struct nfs4_sequence_res *res; 9425 9426 args = task->tk_msg.rpc_argp; 9427 res = task->tk_msg.rpc_resp; 9428 9429 nfs4_setup_sequence(clp, args, res, task); 9430 } 9431 9432 static const struct rpc_call_ops nfs41_sequence_ops = { 9433 .rpc_call_done = nfs41_sequence_call_done, 9434 .rpc_call_prepare = nfs41_sequence_prepare, 9435 .rpc_release = nfs41_sequence_release, 9436 }; 9437 9438 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9439 const struct cred *cred, 9440 struct nfs4_slot *slot, 9441 bool is_privileged) 9442 { 9443 struct nfs4_sequence_data *calldata; 9444 struct rpc_message msg = { 9445 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9446 .rpc_cred = cred, 9447 }; 9448 struct rpc_task_setup task_setup_data = { 9449 .rpc_client = clp->cl_rpcclient, 9450 .rpc_message = &msg, 9451 .callback_ops = &nfs41_sequence_ops, 9452 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9453 }; 9454 struct rpc_task *ret; 9455 9456 ret = ERR_PTR(-EIO); 9457 if (!refcount_inc_not_zero(&clp->cl_count)) 9458 goto out_err; 9459 9460 ret = ERR_PTR(-ENOMEM); 9461 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9462 if (calldata == NULL) 9463 goto out_put_clp; 9464 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9465 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9466 msg.rpc_argp = &calldata->args; 9467 msg.rpc_resp = &calldata->res; 9468 calldata->clp = clp; 9469 task_setup_data.callback_data = calldata; 9470 9471 ret = rpc_run_task(&task_setup_data); 9472 if (IS_ERR(ret)) 9473 goto out_err; 9474 return ret; 9475 out_put_clp: 9476 nfs_put_client(clp); 9477 out_err: 9478 nfs41_release_slot(slot); 9479 return ret; 9480 } 9481 9482 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9483 { 9484 struct rpc_task *task; 9485 int ret = 0; 9486 9487 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9488 return -EAGAIN; 9489 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9490 if (IS_ERR(task)) 9491 ret = PTR_ERR(task); 9492 else 9493 rpc_put_task_async(task); 9494 dprintk("<-- %s status=%d\n", __func__, ret); 9495 return ret; 9496 } 9497 9498 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9499 { 9500 struct rpc_task *task; 9501 int ret; 9502 9503 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9504 if (IS_ERR(task)) { 9505 ret = PTR_ERR(task); 9506 goto out; 9507 } 9508 ret = rpc_wait_for_completion_task(task); 9509 if (!ret) 9510 ret = task->tk_status; 9511 rpc_put_task(task); 9512 out: 9513 dprintk("<-- %s status=%d\n", __func__, ret); 9514 return ret; 9515 } 9516 9517 struct nfs4_reclaim_complete_data { 9518 struct nfs_client *clp; 9519 struct nfs41_reclaim_complete_args arg; 9520 struct nfs41_reclaim_complete_res res; 9521 }; 9522 9523 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9524 { 9525 struct nfs4_reclaim_complete_data *calldata = data; 9526 9527 nfs4_setup_sequence(calldata->clp, 9528 &calldata->arg.seq_args, 9529 &calldata->res.seq_res, 9530 task); 9531 } 9532 9533 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9534 { 9535 switch(task->tk_status) { 9536 case 0: 9537 wake_up_all(&clp->cl_lock_waitq); 9538 fallthrough; 9539 case -NFS4ERR_COMPLETE_ALREADY: 9540 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9541 break; 9542 case -NFS4ERR_DELAY: 9543 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9544 fallthrough; 9545 case -NFS4ERR_RETRY_UNCACHED_REP: 9546 case -EACCES: 9547 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9548 __func__, task->tk_status, clp->cl_hostname); 9549 return -EAGAIN; 9550 case -NFS4ERR_BADSESSION: 9551 case -NFS4ERR_DEADSESSION: 9552 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9553 break; 9554 default: 9555 nfs4_schedule_lease_recovery(clp); 9556 } 9557 return 0; 9558 } 9559 9560 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9561 { 9562 struct nfs4_reclaim_complete_data *calldata = data; 9563 struct nfs_client *clp = calldata->clp; 9564 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9565 9566 if (!nfs41_sequence_done(task, res)) 9567 return; 9568 9569 trace_nfs4_reclaim_complete(clp, task->tk_status); 9570 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9571 rpc_restart_call_prepare(task); 9572 return; 9573 } 9574 } 9575 9576 static void nfs4_free_reclaim_complete_data(void *data) 9577 { 9578 struct nfs4_reclaim_complete_data *calldata = data; 9579 9580 kfree(calldata); 9581 } 9582 9583 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9584 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9585 .rpc_call_done = nfs4_reclaim_complete_done, 9586 .rpc_release = nfs4_free_reclaim_complete_data, 9587 }; 9588 9589 /* 9590 * Issue a global reclaim complete. 9591 */ 9592 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9593 const struct cred *cred) 9594 { 9595 struct nfs4_reclaim_complete_data *calldata; 9596 struct rpc_message msg = { 9597 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9598 .rpc_cred = cred, 9599 }; 9600 struct rpc_task_setup task_setup_data = { 9601 .rpc_client = clp->cl_rpcclient, 9602 .rpc_message = &msg, 9603 .callback_ops = &nfs4_reclaim_complete_call_ops, 9604 .flags = RPC_TASK_NO_ROUND_ROBIN, 9605 }; 9606 int status = -ENOMEM; 9607 9608 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9609 if (calldata == NULL) 9610 goto out; 9611 calldata->clp = clp; 9612 calldata->arg.one_fs = 0; 9613 9614 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9615 msg.rpc_argp = &calldata->arg; 9616 msg.rpc_resp = &calldata->res; 9617 task_setup_data.callback_data = calldata; 9618 status = nfs4_call_sync_custom(&task_setup_data); 9619 out: 9620 dprintk("<-- %s status=%d\n", __func__, status); 9621 return status; 9622 } 9623 9624 static void 9625 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9626 { 9627 struct nfs4_layoutget *lgp = calldata; 9628 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9629 9630 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9631 &lgp->res.seq_res, task); 9632 } 9633 9634 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9635 { 9636 struct nfs4_layoutget *lgp = calldata; 9637 9638 nfs41_sequence_process(task, &lgp->res.seq_res); 9639 } 9640 9641 static int 9642 nfs4_layoutget_handle_exception(struct rpc_task *task, 9643 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9644 { 9645 struct inode *inode = lgp->args.inode; 9646 struct nfs_server *server = NFS_SERVER(inode); 9647 struct pnfs_layout_hdr *lo = lgp->lo; 9648 int nfs4err = task->tk_status; 9649 int err, status = 0; 9650 LIST_HEAD(head); 9651 9652 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9653 9654 nfs4_sequence_free_slot(&lgp->res.seq_res); 9655 9656 switch (nfs4err) { 9657 case 0: 9658 goto out; 9659 9660 /* 9661 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9662 * on the file. set tk_status to -ENODATA to tell upper layer to 9663 * retry go inband. 9664 */ 9665 case -NFS4ERR_LAYOUTUNAVAILABLE: 9666 status = -ENODATA; 9667 goto out; 9668 /* 9669 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9670 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9671 */ 9672 case -NFS4ERR_BADLAYOUT: 9673 status = -EOVERFLOW; 9674 goto out; 9675 /* 9676 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9677 * (or clients) writing to the same RAID stripe except when 9678 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9679 * 9680 * Treat it like we would RECALLCONFLICT -- we retry for a little 9681 * while, and then eventually give up. 9682 */ 9683 case -NFS4ERR_LAYOUTTRYLATER: 9684 if (lgp->args.minlength == 0) { 9685 status = -EOVERFLOW; 9686 goto out; 9687 } 9688 status = -EBUSY; 9689 break; 9690 case -NFS4ERR_RECALLCONFLICT: 9691 case -NFS4ERR_RETURNCONFLICT: 9692 status = -ERECALLCONFLICT; 9693 break; 9694 case -NFS4ERR_DELEG_REVOKED: 9695 case -NFS4ERR_ADMIN_REVOKED: 9696 case -NFS4ERR_EXPIRED: 9697 case -NFS4ERR_BAD_STATEID: 9698 exception->timeout = 0; 9699 spin_lock(&inode->i_lock); 9700 /* If the open stateid was bad, then recover it. */ 9701 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9702 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9703 spin_unlock(&inode->i_lock); 9704 exception->state = lgp->args.ctx->state; 9705 exception->stateid = &lgp->args.stateid; 9706 break; 9707 } 9708 9709 /* 9710 * Mark the bad layout state as invalid, then retry 9711 */ 9712 pnfs_mark_layout_stateid_invalid(lo, &head); 9713 spin_unlock(&inode->i_lock); 9714 nfs_commit_inode(inode, 0); 9715 pnfs_free_lseg_list(&head); 9716 status = -EAGAIN; 9717 goto out; 9718 } 9719 9720 err = nfs4_handle_exception(server, nfs4err, exception); 9721 if (!status) { 9722 if (exception->retry) 9723 status = -EAGAIN; 9724 else 9725 status = err; 9726 } 9727 out: 9728 return status; 9729 } 9730 9731 size_t max_response_pages(struct nfs_server *server) 9732 { 9733 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9734 return nfs_page_array_len(0, max_resp_sz); 9735 } 9736 9737 static void nfs4_layoutget_release(void *calldata) 9738 { 9739 struct nfs4_layoutget *lgp = calldata; 9740 9741 nfs4_sequence_free_slot(&lgp->res.seq_res); 9742 pnfs_layoutget_free(lgp); 9743 } 9744 9745 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9746 .rpc_call_prepare = nfs4_layoutget_prepare, 9747 .rpc_call_done = nfs4_layoutget_done, 9748 .rpc_release = nfs4_layoutget_release, 9749 }; 9750 9751 struct pnfs_layout_segment * 9752 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9753 { 9754 struct inode *inode = lgp->args.inode; 9755 struct nfs_server *server = NFS_SERVER(inode); 9756 struct rpc_task *task; 9757 struct rpc_message msg = { 9758 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9759 .rpc_argp = &lgp->args, 9760 .rpc_resp = &lgp->res, 9761 .rpc_cred = lgp->cred, 9762 }; 9763 struct rpc_task_setup task_setup_data = { 9764 .rpc_client = server->client, 9765 .rpc_message = &msg, 9766 .callback_ops = &nfs4_layoutget_call_ops, 9767 .callback_data = lgp, 9768 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9769 RPC_TASK_MOVEABLE, 9770 }; 9771 struct pnfs_layout_segment *lseg = NULL; 9772 struct nfs4_exception exception = { 9773 .inode = inode, 9774 .timeout = *timeout, 9775 }; 9776 int status = 0; 9777 9778 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9779 9780 task = rpc_run_task(&task_setup_data); 9781 if (IS_ERR(task)) 9782 return ERR_CAST(task); 9783 9784 status = rpc_wait_for_completion_task(task); 9785 if (status != 0) 9786 goto out; 9787 9788 if (task->tk_status < 0) { 9789 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9790 *timeout = exception.timeout; 9791 } else if (lgp->res.layoutp->len == 0) { 9792 status = -EAGAIN; 9793 *timeout = nfs4_update_delay(&exception.timeout); 9794 } else 9795 lseg = pnfs_layout_process(lgp); 9796 out: 9797 trace_nfs4_layoutget(lgp->args.ctx, 9798 &lgp->args.range, 9799 &lgp->res.range, 9800 &lgp->res.stateid, 9801 status); 9802 9803 rpc_put_task(task); 9804 dprintk("<-- %s status=%d\n", __func__, status); 9805 if (status) 9806 return ERR_PTR(status); 9807 return lseg; 9808 } 9809 9810 static void 9811 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9812 { 9813 struct nfs4_layoutreturn *lrp = calldata; 9814 9815 nfs4_setup_sequence(lrp->clp, 9816 &lrp->args.seq_args, 9817 &lrp->res.seq_res, 9818 task); 9819 if (!pnfs_layout_is_valid(lrp->args.layout)) 9820 rpc_exit(task, 0); 9821 } 9822 9823 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9824 { 9825 struct nfs4_layoutreturn *lrp = calldata; 9826 struct nfs_server *server; 9827 9828 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9829 return; 9830 9831 /* 9832 * Was there an RPC level error? Assume the call succeeded, 9833 * and that we need to release the layout 9834 */ 9835 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9836 lrp->res.lrs_present = 0; 9837 return; 9838 } 9839 9840 server = NFS_SERVER(lrp->args.inode); 9841 switch (task->tk_status) { 9842 case -NFS4ERR_OLD_STATEID: 9843 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9844 &lrp->args.range, 9845 lrp->args.inode)) 9846 goto out_restart; 9847 fallthrough; 9848 default: 9849 task->tk_status = 0; 9850 lrp->res.lrs_present = 0; 9851 fallthrough; 9852 case 0: 9853 break; 9854 case -NFS4ERR_DELAY: 9855 if (nfs4_async_handle_error(task, server, NULL, NULL) == 9856 -EAGAIN) 9857 goto out_restart; 9858 lrp->res.lrs_present = 0; 9859 break; 9860 } 9861 return; 9862 out_restart: 9863 task->tk_status = 0; 9864 nfs4_sequence_free_slot(&lrp->res.seq_res); 9865 rpc_restart_call_prepare(task); 9866 } 9867 9868 static void nfs4_layoutreturn_release(void *calldata) 9869 { 9870 struct nfs4_layoutreturn *lrp = calldata; 9871 struct pnfs_layout_hdr *lo = lrp->args.layout; 9872 9873 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9874 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9875 nfs4_sequence_free_slot(&lrp->res.seq_res); 9876 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9877 lrp->ld_private.ops->free(&lrp->ld_private); 9878 pnfs_put_layout_hdr(lrp->args.layout); 9879 nfs_iput_and_deactive(lrp->inode); 9880 put_cred(lrp->cred); 9881 kfree(calldata); 9882 } 9883 9884 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9885 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9886 .rpc_call_done = nfs4_layoutreturn_done, 9887 .rpc_release = nfs4_layoutreturn_release, 9888 }; 9889 9890 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9891 { 9892 struct rpc_task *task; 9893 struct rpc_message msg = { 9894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9895 .rpc_argp = &lrp->args, 9896 .rpc_resp = &lrp->res, 9897 .rpc_cred = lrp->cred, 9898 }; 9899 struct rpc_task_setup task_setup_data = { 9900 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9901 .rpc_message = &msg, 9902 .callback_ops = &nfs4_layoutreturn_call_ops, 9903 .callback_data = lrp, 9904 .flags = RPC_TASK_MOVEABLE, 9905 }; 9906 int status = 0; 9907 9908 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9909 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9910 &task_setup_data.rpc_client, &msg); 9911 9912 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9913 if (!sync) { 9914 if (!lrp->inode) { 9915 nfs4_layoutreturn_release(lrp); 9916 return -EAGAIN; 9917 } 9918 task_setup_data.flags |= RPC_TASK_ASYNC; 9919 } 9920 if (!lrp->inode) 9921 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9922 1); 9923 else 9924 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9925 0); 9926 task = rpc_run_task(&task_setup_data); 9927 if (IS_ERR(task)) 9928 return PTR_ERR(task); 9929 if (sync) 9930 status = task->tk_status; 9931 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9932 dprintk("<-- %s status=%d\n", __func__, status); 9933 rpc_put_task(task); 9934 return status; 9935 } 9936 9937 static int 9938 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9939 struct pnfs_device *pdev, 9940 const struct cred *cred) 9941 { 9942 struct nfs4_getdeviceinfo_args args = { 9943 .pdev = pdev, 9944 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9945 NOTIFY_DEVICEID4_DELETE, 9946 }; 9947 struct nfs4_getdeviceinfo_res res = { 9948 .pdev = pdev, 9949 }; 9950 struct rpc_message msg = { 9951 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9952 .rpc_argp = &args, 9953 .rpc_resp = &res, 9954 .rpc_cred = cred, 9955 }; 9956 int status; 9957 9958 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9959 if (res.notification & ~args.notify_types) 9960 dprintk("%s: unsupported notification\n", __func__); 9961 if (res.notification != args.notify_types) 9962 pdev->nocache = 1; 9963 9964 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9965 9966 dprintk("<-- %s status=%d\n", __func__, status); 9967 9968 return status; 9969 } 9970 9971 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9972 struct pnfs_device *pdev, 9973 const struct cred *cred) 9974 { 9975 struct nfs4_exception exception = { }; 9976 int err; 9977 9978 do { 9979 err = nfs4_handle_exception(server, 9980 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9981 &exception); 9982 } while (exception.retry); 9983 return err; 9984 } 9985 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9986 9987 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9988 { 9989 struct nfs4_layoutcommit_data *data = calldata; 9990 struct nfs_server *server = NFS_SERVER(data->args.inode); 9991 9992 nfs4_setup_sequence(server->nfs_client, 9993 &data->args.seq_args, 9994 &data->res.seq_res, 9995 task); 9996 } 9997 9998 static void 9999 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 10000 { 10001 struct nfs4_layoutcommit_data *data = calldata; 10002 struct nfs_server *server = NFS_SERVER(data->args.inode); 10003 10004 if (!nfs41_sequence_done(task, &data->res.seq_res)) 10005 return; 10006 10007 switch (task->tk_status) { /* Just ignore these failures */ 10008 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 10009 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 10010 case -NFS4ERR_BADLAYOUT: /* no layout */ 10011 case -NFS4ERR_GRACE: /* loca_recalim always false */ 10012 task->tk_status = 0; 10013 break; 10014 case 0: 10015 break; 10016 default: 10017 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 10018 rpc_restart_call_prepare(task); 10019 return; 10020 } 10021 } 10022 } 10023 10024 static void nfs4_layoutcommit_release(void *calldata) 10025 { 10026 struct nfs4_layoutcommit_data *data = calldata; 10027 10028 pnfs_cleanup_layoutcommit(data); 10029 nfs_post_op_update_inode_force_wcc(data->args.inode, 10030 data->res.fattr); 10031 put_cred(data->cred); 10032 nfs_iput_and_deactive(data->inode); 10033 kfree(data); 10034 } 10035 10036 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10037 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10038 .rpc_call_done = nfs4_layoutcommit_done, 10039 .rpc_release = nfs4_layoutcommit_release, 10040 }; 10041 10042 int 10043 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10044 { 10045 struct rpc_message msg = { 10046 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10047 .rpc_argp = &data->args, 10048 .rpc_resp = &data->res, 10049 .rpc_cred = data->cred, 10050 }; 10051 struct rpc_task_setup task_setup_data = { 10052 .task = &data->task, 10053 .rpc_client = NFS_CLIENT(data->args.inode), 10054 .rpc_message = &msg, 10055 .callback_ops = &nfs4_layoutcommit_ops, 10056 .callback_data = data, 10057 .flags = RPC_TASK_MOVEABLE, 10058 }; 10059 struct rpc_task *task; 10060 int status = 0; 10061 10062 dprintk("NFS: initiating layoutcommit call. sync %d " 10063 "lbw: %llu inode %lu\n", sync, 10064 data->args.lastbytewritten, 10065 data->args.inode->i_ino); 10066 10067 if (!sync) { 10068 data->inode = nfs_igrab_and_active(data->args.inode); 10069 if (data->inode == NULL) { 10070 nfs4_layoutcommit_release(data); 10071 return -EAGAIN; 10072 } 10073 task_setup_data.flags = RPC_TASK_ASYNC; 10074 } 10075 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10076 task = rpc_run_task(&task_setup_data); 10077 if (IS_ERR(task)) 10078 return PTR_ERR(task); 10079 if (sync) 10080 status = task->tk_status; 10081 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10082 dprintk("%s: status %d\n", __func__, status); 10083 rpc_put_task(task); 10084 return status; 10085 } 10086 10087 /* 10088 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10089 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10090 */ 10091 static int 10092 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10093 struct nfs_fsinfo *info, 10094 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10095 { 10096 struct nfs41_secinfo_no_name_args args = { 10097 .style = SECINFO_STYLE_CURRENT_FH, 10098 }; 10099 struct nfs4_secinfo_res res = { 10100 .flavors = flavors, 10101 }; 10102 struct rpc_message msg = { 10103 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10104 .rpc_argp = &args, 10105 .rpc_resp = &res, 10106 }; 10107 struct nfs4_call_sync_data data = { 10108 .seq_server = server, 10109 .seq_args = &args.seq_args, 10110 .seq_res = &res.seq_res, 10111 }; 10112 struct rpc_task_setup task_setup = { 10113 .rpc_client = server->client, 10114 .rpc_message = &msg, 10115 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10116 .callback_data = &data, 10117 .flags = RPC_TASK_NO_ROUND_ROBIN, 10118 }; 10119 const struct cred *cred = NULL; 10120 int status; 10121 10122 if (use_integrity) { 10123 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10124 10125 cred = nfs4_get_clid_cred(server->nfs_client); 10126 msg.rpc_cred = cred; 10127 } 10128 10129 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10130 status = nfs4_call_sync_custom(&task_setup); 10131 dprintk("<-- %s status=%d\n", __func__, status); 10132 10133 put_cred(cred); 10134 10135 return status; 10136 } 10137 10138 static int 10139 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10140 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10141 { 10142 struct nfs4_exception exception = { 10143 .interruptible = true, 10144 }; 10145 int err; 10146 do { 10147 /* first try using integrity protection */ 10148 err = -NFS4ERR_WRONGSEC; 10149 10150 /* try to use integrity protection with machine cred */ 10151 if (_nfs4_is_integrity_protected(server->nfs_client)) 10152 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10153 flavors, true); 10154 10155 /* 10156 * if unable to use integrity protection, or SECINFO with 10157 * integrity protection returns NFS4ERR_WRONGSEC (which is 10158 * disallowed by spec, but exists in deployed servers) use 10159 * the current filesystem's rpc_client and the user cred. 10160 */ 10161 if (err == -NFS4ERR_WRONGSEC) 10162 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10163 flavors, false); 10164 10165 switch (err) { 10166 case 0: 10167 case -NFS4ERR_WRONGSEC: 10168 case -ENOTSUPP: 10169 goto out; 10170 default: 10171 err = nfs4_handle_exception(server, err, &exception); 10172 } 10173 } while (exception.retry); 10174 out: 10175 return err; 10176 } 10177 10178 static int 10179 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10180 struct nfs_fsinfo *info) 10181 { 10182 int err; 10183 struct page *page; 10184 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10185 struct nfs4_secinfo_flavors *flavors; 10186 struct nfs4_secinfo4 *secinfo; 10187 int i; 10188 10189 page = alloc_page(GFP_KERNEL); 10190 if (!page) { 10191 err = -ENOMEM; 10192 goto out; 10193 } 10194 10195 flavors = page_address(page); 10196 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10197 10198 /* 10199 * Fall back on "guess and check" method if 10200 * the server doesn't support SECINFO_NO_NAME 10201 */ 10202 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10203 err = nfs4_find_root_sec(server, fhandle, info); 10204 goto out_freepage; 10205 } 10206 if (err) 10207 goto out_freepage; 10208 10209 for (i = 0; i < flavors->num_flavors; i++) { 10210 secinfo = &flavors->flavors[i]; 10211 10212 switch (secinfo->flavor) { 10213 case RPC_AUTH_NULL: 10214 case RPC_AUTH_UNIX: 10215 case RPC_AUTH_GSS: 10216 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10217 &secinfo->flavor_info); 10218 break; 10219 default: 10220 flavor = RPC_AUTH_MAXFLAVOR; 10221 break; 10222 } 10223 10224 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10225 flavor = RPC_AUTH_MAXFLAVOR; 10226 10227 if (flavor != RPC_AUTH_MAXFLAVOR) { 10228 err = nfs4_lookup_root_sec(server, fhandle, 10229 info, flavor); 10230 if (!err) 10231 break; 10232 } 10233 } 10234 10235 if (flavor == RPC_AUTH_MAXFLAVOR) 10236 err = -EPERM; 10237 10238 out_freepage: 10239 put_page(page); 10240 if (err == -EACCES) 10241 return -EPERM; 10242 out: 10243 return err; 10244 } 10245 10246 static int _nfs41_test_stateid(struct nfs_server *server, 10247 nfs4_stateid *stateid, 10248 const struct cred *cred) 10249 { 10250 int status; 10251 struct nfs41_test_stateid_args args = { 10252 .stateid = stateid, 10253 }; 10254 struct nfs41_test_stateid_res res; 10255 struct rpc_message msg = { 10256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10257 .rpc_argp = &args, 10258 .rpc_resp = &res, 10259 .rpc_cred = cred, 10260 }; 10261 struct rpc_clnt *rpc_client = server->client; 10262 10263 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10264 &rpc_client, &msg); 10265 10266 dprintk("NFS call test_stateid %p\n", stateid); 10267 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10268 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10269 &args.seq_args, &res.seq_res); 10270 if (status != NFS_OK) { 10271 dprintk("NFS reply test_stateid: failed, %d\n", status); 10272 return status; 10273 } 10274 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10275 return -res.status; 10276 } 10277 10278 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10279 int err, struct nfs4_exception *exception) 10280 { 10281 exception->retry = 0; 10282 switch(err) { 10283 case -NFS4ERR_DELAY: 10284 case -NFS4ERR_RETRY_UNCACHED_REP: 10285 nfs4_handle_exception(server, err, exception); 10286 break; 10287 case -NFS4ERR_BADSESSION: 10288 case -NFS4ERR_BADSLOT: 10289 case -NFS4ERR_BAD_HIGH_SLOT: 10290 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10291 case -NFS4ERR_DEADSESSION: 10292 nfs4_do_handle_exception(server, err, exception); 10293 } 10294 } 10295 10296 /** 10297 * nfs41_test_stateid - perform a TEST_STATEID operation 10298 * 10299 * @server: server / transport on which to perform the operation 10300 * @stateid: state ID to test 10301 * @cred: credential 10302 * 10303 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10304 * Otherwise a negative NFS4ERR value is returned if the operation 10305 * failed or the state ID is not currently valid. 10306 */ 10307 static int nfs41_test_stateid(struct nfs_server *server, 10308 nfs4_stateid *stateid, 10309 const struct cred *cred) 10310 { 10311 struct nfs4_exception exception = { 10312 .interruptible = true, 10313 }; 10314 int err; 10315 do { 10316 err = _nfs41_test_stateid(server, stateid, cred); 10317 nfs4_handle_delay_or_session_error(server, err, &exception); 10318 } while (exception.retry); 10319 return err; 10320 } 10321 10322 struct nfs_free_stateid_data { 10323 struct nfs_server *server; 10324 struct nfs41_free_stateid_args args; 10325 struct nfs41_free_stateid_res res; 10326 }; 10327 10328 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10329 { 10330 struct nfs_free_stateid_data *data = calldata; 10331 nfs4_setup_sequence(data->server->nfs_client, 10332 &data->args.seq_args, 10333 &data->res.seq_res, 10334 task); 10335 } 10336 10337 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10338 { 10339 struct nfs_free_stateid_data *data = calldata; 10340 10341 nfs41_sequence_done(task, &data->res.seq_res); 10342 10343 switch (task->tk_status) { 10344 case -NFS4ERR_DELAY: 10345 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10346 rpc_restart_call_prepare(task); 10347 } 10348 } 10349 10350 static void nfs41_free_stateid_release(void *calldata) 10351 { 10352 struct nfs_free_stateid_data *data = calldata; 10353 struct nfs_client *clp = data->server->nfs_client; 10354 10355 nfs_put_client(clp); 10356 kfree(calldata); 10357 } 10358 10359 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10360 .rpc_call_prepare = nfs41_free_stateid_prepare, 10361 .rpc_call_done = nfs41_free_stateid_done, 10362 .rpc_release = nfs41_free_stateid_release, 10363 }; 10364 10365 /** 10366 * nfs41_free_stateid - perform a FREE_STATEID operation 10367 * 10368 * @server: server / transport on which to perform the operation 10369 * @stateid: state ID to release 10370 * @cred: credential 10371 * @privileged: set to true if this call needs to be privileged 10372 * 10373 * Note: this function is always asynchronous. 10374 */ 10375 static int nfs41_free_stateid(struct nfs_server *server, 10376 const nfs4_stateid *stateid, 10377 const struct cred *cred, 10378 bool privileged) 10379 { 10380 struct rpc_message msg = { 10381 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10382 .rpc_cred = cred, 10383 }; 10384 struct rpc_task_setup task_setup = { 10385 .rpc_client = server->client, 10386 .rpc_message = &msg, 10387 .callback_ops = &nfs41_free_stateid_ops, 10388 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10389 }; 10390 struct nfs_free_stateid_data *data; 10391 struct rpc_task *task; 10392 struct nfs_client *clp = server->nfs_client; 10393 10394 if (!refcount_inc_not_zero(&clp->cl_count)) 10395 return -EIO; 10396 10397 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10398 &task_setup.rpc_client, &msg); 10399 10400 dprintk("NFS call free_stateid %p\n", stateid); 10401 data = kmalloc(sizeof(*data), GFP_KERNEL); 10402 if (!data) 10403 return -ENOMEM; 10404 data->server = server; 10405 nfs4_stateid_copy(&data->args.stateid, stateid); 10406 10407 task_setup.callback_data = data; 10408 10409 msg.rpc_argp = &data->args; 10410 msg.rpc_resp = &data->res; 10411 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10412 task = rpc_run_task(&task_setup); 10413 if (IS_ERR(task)) 10414 return PTR_ERR(task); 10415 rpc_put_task(task); 10416 return 0; 10417 } 10418 10419 static void 10420 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10421 { 10422 const struct cred *cred = lsp->ls_state->owner->so_cred; 10423 10424 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10425 nfs4_free_lock_state(server, lsp); 10426 } 10427 10428 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10429 const nfs4_stateid *s2) 10430 { 10431 if (s1->type != s2->type) 10432 return false; 10433 10434 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10435 return false; 10436 10437 if (s1->seqid == s2->seqid) 10438 return true; 10439 10440 return s1->seqid == 0 || s2->seqid == 0; 10441 } 10442 10443 #endif /* CONFIG_NFS_V4_1 */ 10444 10445 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10446 const nfs4_stateid *s2) 10447 { 10448 return nfs4_stateid_match(s1, s2); 10449 } 10450 10451 10452 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10453 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10454 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10455 .recover_open = nfs4_open_reclaim, 10456 .recover_lock = nfs4_lock_reclaim, 10457 .establish_clid = nfs4_init_clientid, 10458 .detect_trunking = nfs40_discover_server_trunking, 10459 }; 10460 10461 #if defined(CONFIG_NFS_V4_1) 10462 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10463 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10464 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10465 .recover_open = nfs4_open_reclaim, 10466 .recover_lock = nfs4_lock_reclaim, 10467 .establish_clid = nfs41_init_clientid, 10468 .reclaim_complete = nfs41_proc_reclaim_complete, 10469 .detect_trunking = nfs41_discover_server_trunking, 10470 }; 10471 #endif /* CONFIG_NFS_V4_1 */ 10472 10473 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10474 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10475 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10476 .recover_open = nfs40_open_expired, 10477 .recover_lock = nfs4_lock_expired, 10478 .establish_clid = nfs4_init_clientid, 10479 }; 10480 10481 #if defined(CONFIG_NFS_V4_1) 10482 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10483 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10484 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10485 .recover_open = nfs41_open_expired, 10486 .recover_lock = nfs41_lock_expired, 10487 .establish_clid = nfs41_init_clientid, 10488 }; 10489 #endif /* CONFIG_NFS_V4_1 */ 10490 10491 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10492 .sched_state_renewal = nfs4_proc_async_renew, 10493 .get_state_renewal_cred = nfs4_get_renew_cred, 10494 .renew_lease = nfs4_proc_renew, 10495 }; 10496 10497 #if defined(CONFIG_NFS_V4_1) 10498 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10499 .sched_state_renewal = nfs41_proc_async_sequence, 10500 .get_state_renewal_cred = nfs4_get_machine_cred, 10501 .renew_lease = nfs4_proc_sequence, 10502 }; 10503 #endif 10504 10505 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10506 .get_locations = _nfs40_proc_get_locations, 10507 .fsid_present = _nfs40_proc_fsid_present, 10508 }; 10509 10510 #if defined(CONFIG_NFS_V4_1) 10511 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10512 .get_locations = _nfs41_proc_get_locations, 10513 .fsid_present = _nfs41_proc_fsid_present, 10514 }; 10515 #endif /* CONFIG_NFS_V4_1 */ 10516 10517 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10518 .minor_version = 0, 10519 .init_caps = NFS_CAP_READDIRPLUS 10520 | NFS_CAP_ATOMIC_OPEN 10521 | NFS_CAP_POSIX_LOCK, 10522 .init_client = nfs40_init_client, 10523 .shutdown_client = nfs40_shutdown_client, 10524 .match_stateid = nfs4_match_stateid, 10525 .find_root_sec = nfs4_find_root_sec, 10526 .free_lock_state = nfs4_release_lockowner, 10527 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10528 .alloc_seqid = nfs_alloc_seqid, 10529 .call_sync_ops = &nfs40_call_sync_ops, 10530 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10531 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10532 .state_renewal_ops = &nfs40_state_renewal_ops, 10533 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10534 }; 10535 10536 #if defined(CONFIG_NFS_V4_1) 10537 static struct nfs_seqid * 10538 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10539 { 10540 return NULL; 10541 } 10542 10543 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10544 .minor_version = 1, 10545 .init_caps = NFS_CAP_READDIRPLUS 10546 | NFS_CAP_ATOMIC_OPEN 10547 | NFS_CAP_POSIX_LOCK 10548 | NFS_CAP_STATEID_NFSV41 10549 | NFS_CAP_ATOMIC_OPEN_V1 10550 | NFS_CAP_LGOPEN 10551 | NFS_CAP_MOVEABLE, 10552 .init_client = nfs41_init_client, 10553 .shutdown_client = nfs41_shutdown_client, 10554 .match_stateid = nfs41_match_stateid, 10555 .find_root_sec = nfs41_find_root_sec, 10556 .free_lock_state = nfs41_free_lock_state, 10557 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10558 .alloc_seqid = nfs_alloc_no_seqid, 10559 .session_trunk = nfs4_test_session_trunk, 10560 .call_sync_ops = &nfs41_call_sync_ops, 10561 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10562 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10563 .state_renewal_ops = &nfs41_state_renewal_ops, 10564 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10565 }; 10566 #endif 10567 10568 #if defined(CONFIG_NFS_V4_2) 10569 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10570 .minor_version = 2, 10571 .init_caps = NFS_CAP_READDIRPLUS 10572 | NFS_CAP_ATOMIC_OPEN 10573 | NFS_CAP_POSIX_LOCK 10574 | NFS_CAP_STATEID_NFSV41 10575 | NFS_CAP_ATOMIC_OPEN_V1 10576 | NFS_CAP_LGOPEN 10577 | NFS_CAP_ALLOCATE 10578 | NFS_CAP_COPY 10579 | NFS_CAP_OFFLOAD_CANCEL 10580 | NFS_CAP_COPY_NOTIFY 10581 | NFS_CAP_DEALLOCATE 10582 | NFS_CAP_SEEK 10583 | NFS_CAP_LAYOUTSTATS 10584 | NFS_CAP_CLONE 10585 | NFS_CAP_LAYOUTERROR 10586 | NFS_CAP_READ_PLUS 10587 | NFS_CAP_MOVEABLE, 10588 .init_client = nfs41_init_client, 10589 .shutdown_client = nfs41_shutdown_client, 10590 .match_stateid = nfs41_match_stateid, 10591 .find_root_sec = nfs41_find_root_sec, 10592 .free_lock_state = nfs41_free_lock_state, 10593 .call_sync_ops = &nfs41_call_sync_ops, 10594 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10595 .alloc_seqid = nfs_alloc_no_seqid, 10596 .session_trunk = nfs4_test_session_trunk, 10597 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10598 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10599 .state_renewal_ops = &nfs41_state_renewal_ops, 10600 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10601 }; 10602 #endif 10603 10604 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10605 [0] = &nfs_v4_0_minor_ops, 10606 #if defined(CONFIG_NFS_V4_1) 10607 [1] = &nfs_v4_1_minor_ops, 10608 #endif 10609 #if defined(CONFIG_NFS_V4_2) 10610 [2] = &nfs_v4_2_minor_ops, 10611 #endif 10612 }; 10613 10614 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10615 { 10616 ssize_t error, error2, error3; 10617 size_t left = size; 10618 10619 error = generic_listxattr(dentry, list, left); 10620 if (error < 0) 10621 return error; 10622 if (list) { 10623 list += error; 10624 left -= error; 10625 } 10626 10627 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left); 10628 if (error2 < 0) 10629 return error2; 10630 10631 if (list) { 10632 list += error2; 10633 left -= error2; 10634 } 10635 10636 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left); 10637 if (error3 < 0) 10638 return error3; 10639 10640 error += error2 + error3; 10641 if (size && error > size) 10642 return -ERANGE; 10643 return error; 10644 } 10645 10646 static void nfs4_enable_swap(struct inode *inode) 10647 { 10648 /* The state manager thread must always be running. 10649 * It will notice the client is a swapper, and stay put. 10650 */ 10651 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10652 10653 nfs4_schedule_state_manager(clp); 10654 } 10655 10656 static void nfs4_disable_swap(struct inode *inode) 10657 { 10658 /* The state manager thread will now exit once it is 10659 * woken. 10660 */ 10661 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10662 10663 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10664 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10665 wake_up_var(&clp->cl_state); 10666 } 10667 10668 static const struct inode_operations nfs4_dir_inode_operations = { 10669 .create = nfs_create, 10670 .lookup = nfs_lookup, 10671 .atomic_open = nfs_atomic_open, 10672 .link = nfs_link, 10673 .unlink = nfs_unlink, 10674 .symlink = nfs_symlink, 10675 .mkdir = nfs_mkdir, 10676 .rmdir = nfs_rmdir, 10677 .mknod = nfs_mknod, 10678 .rename = nfs_rename, 10679 .permission = nfs_permission, 10680 .getattr = nfs_getattr, 10681 .setattr = nfs_setattr, 10682 .listxattr = nfs4_listxattr, 10683 }; 10684 10685 static const struct inode_operations nfs4_file_inode_operations = { 10686 .permission = nfs_permission, 10687 .getattr = nfs_getattr, 10688 .setattr = nfs_setattr, 10689 .listxattr = nfs4_listxattr, 10690 }; 10691 10692 const struct nfs_rpc_ops nfs_v4_clientops = { 10693 .version = 4, /* protocol version */ 10694 .dentry_ops = &nfs4_dentry_operations, 10695 .dir_inode_ops = &nfs4_dir_inode_operations, 10696 .file_inode_ops = &nfs4_file_inode_operations, 10697 .file_ops = &nfs4_file_operations, 10698 .getroot = nfs4_proc_get_root, 10699 .submount = nfs4_submount, 10700 .try_get_tree = nfs4_try_get_tree, 10701 .getattr = nfs4_proc_getattr, 10702 .setattr = nfs4_proc_setattr, 10703 .lookup = nfs4_proc_lookup, 10704 .lookupp = nfs4_proc_lookupp, 10705 .access = nfs4_proc_access, 10706 .readlink = nfs4_proc_readlink, 10707 .create = nfs4_proc_create, 10708 .remove = nfs4_proc_remove, 10709 .unlink_setup = nfs4_proc_unlink_setup, 10710 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10711 .unlink_done = nfs4_proc_unlink_done, 10712 .rename_setup = nfs4_proc_rename_setup, 10713 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10714 .rename_done = nfs4_proc_rename_done, 10715 .link = nfs4_proc_link, 10716 .symlink = nfs4_proc_symlink, 10717 .mkdir = nfs4_proc_mkdir, 10718 .rmdir = nfs4_proc_rmdir, 10719 .readdir = nfs4_proc_readdir, 10720 .mknod = nfs4_proc_mknod, 10721 .statfs = nfs4_proc_statfs, 10722 .fsinfo = nfs4_proc_fsinfo, 10723 .pathconf = nfs4_proc_pathconf, 10724 .set_capabilities = nfs4_server_capabilities, 10725 .decode_dirent = nfs4_decode_dirent, 10726 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10727 .read_setup = nfs4_proc_read_setup, 10728 .read_done = nfs4_read_done, 10729 .write_setup = nfs4_proc_write_setup, 10730 .write_done = nfs4_write_done, 10731 .commit_setup = nfs4_proc_commit_setup, 10732 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10733 .commit_done = nfs4_commit_done, 10734 .lock = nfs4_proc_lock, 10735 .clear_acl_cache = nfs4_zap_acl_attr, 10736 .close_context = nfs4_close_context, 10737 .open_context = nfs4_atomic_open, 10738 .have_delegation = nfs4_have_delegation, 10739 .alloc_client = nfs4_alloc_client, 10740 .init_client = nfs4_init_client, 10741 .free_client = nfs4_free_client, 10742 .create_server = nfs4_create_server, 10743 .clone_server = nfs_clone_server, 10744 .discover_trunking = nfs4_discover_trunking, 10745 .enable_swap = nfs4_enable_swap, 10746 .disable_swap = nfs4_disable_swap, 10747 }; 10748 10749 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10750 .name = XATTR_NAME_NFSV4_ACL, 10751 .list = nfs4_xattr_list_nfs4_acl, 10752 .get = nfs4_xattr_get_nfs4_acl, 10753 .set = nfs4_xattr_set_nfs4_acl, 10754 }; 10755 10756 #if defined(CONFIG_NFS_V4_1) 10757 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10758 .name = XATTR_NAME_NFSV4_DACL, 10759 .list = nfs4_xattr_list_nfs4_dacl, 10760 .get = nfs4_xattr_get_nfs4_dacl, 10761 .set = nfs4_xattr_set_nfs4_dacl, 10762 }; 10763 10764 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10765 .name = XATTR_NAME_NFSV4_SACL, 10766 .list = nfs4_xattr_list_nfs4_sacl, 10767 .get = nfs4_xattr_get_nfs4_sacl, 10768 .set = nfs4_xattr_set_nfs4_sacl, 10769 }; 10770 #endif 10771 10772 #ifdef CONFIG_NFS_V4_2 10773 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10774 .prefix = XATTR_USER_PREFIX, 10775 .get = nfs4_xattr_get_nfs4_user, 10776 .set = nfs4_xattr_set_nfs4_user, 10777 }; 10778 #endif 10779 10780 const struct xattr_handler *nfs4_xattr_handlers[] = { 10781 &nfs4_xattr_nfs4_acl_handler, 10782 #if defined(CONFIG_NFS_V4_1) 10783 &nfs4_xattr_nfs4_dacl_handler, 10784 &nfs4_xattr_nfs4_sacl_handler, 10785 #endif 10786 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10787 &nfs4_xattr_nfs4_label_handler, 10788 #endif 10789 #ifdef CONFIG_NFS_V4_2 10790 &nfs4_xattr_nfs4_user_handler, 10791 #endif 10792 NULL 10793 }; 10794