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 "nfs4idmap.h" 67 #include "nfs4session.h" 68 #include "fscache.h" 69 70 #include "nfs4trace.h" 71 72 #define NFSDBG_FACILITY NFSDBG_PROC 73 74 #define NFS4_BITMASK_SZ 3 75 76 #define NFS4_POLL_RETRY_MIN (HZ/10) 77 #define NFS4_POLL_RETRY_MAX (15*HZ) 78 79 /* file attributes which can be mapped to nfs attributes */ 80 #define NFS4_VALID_ATTRS (ATTR_MODE \ 81 | ATTR_UID \ 82 | ATTR_GID \ 83 | ATTR_SIZE \ 84 | ATTR_ATIME \ 85 | ATTR_MTIME \ 86 | ATTR_CTIME \ 87 | ATTR_ATIME_SET \ 88 | ATTR_MTIME_SET) 89 90 struct nfs4_opendata; 91 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 92 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 93 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 94 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label, struct inode *inode); 95 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode); 96 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 97 struct nfs_fattr *fattr, struct iattr *sattr, 98 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 99 struct nfs4_label *olabel); 100 #ifdef CONFIG_NFS_V4_1 101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 102 struct rpc_cred *cred, 103 struct nfs4_slot *slot, 104 bool is_privileged); 105 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 106 struct rpc_cred *); 107 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 108 struct rpc_cred *, bool); 109 #endif 110 111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 112 static inline struct nfs4_label * 113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 114 struct iattr *sattr, struct nfs4_label *label) 115 { 116 int err; 117 118 if (label == NULL) 119 return NULL; 120 121 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 122 return NULL; 123 124 err = security_dentry_init_security(dentry, sattr->ia_mode, 125 &dentry->d_name, (void **)&label->label, &label->len); 126 if (err == 0) 127 return label; 128 129 return NULL; 130 } 131 static inline void 132 nfs4_label_release_security(struct nfs4_label *label) 133 { 134 if (label) 135 security_release_secctx(label->label, label->len); 136 } 137 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 138 { 139 if (label) 140 return server->attr_bitmask; 141 142 return server->attr_bitmask_nl; 143 } 144 #else 145 static inline struct nfs4_label * 146 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 147 struct iattr *sattr, struct nfs4_label *l) 148 { return NULL; } 149 static inline void 150 nfs4_label_release_security(struct nfs4_label *label) 151 { return; } 152 static inline u32 * 153 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 154 { return server->attr_bitmask; } 155 #endif 156 157 /* Prevent leaks of NFSv4 errors into userland */ 158 static int nfs4_map_errors(int err) 159 { 160 if (err >= -1000) 161 return err; 162 switch (err) { 163 case -NFS4ERR_RESOURCE: 164 case -NFS4ERR_LAYOUTTRYLATER: 165 case -NFS4ERR_RECALLCONFLICT: 166 return -EREMOTEIO; 167 case -NFS4ERR_WRONGSEC: 168 case -NFS4ERR_WRONG_CRED: 169 return -EPERM; 170 case -NFS4ERR_BADOWNER: 171 case -NFS4ERR_BADNAME: 172 return -EINVAL; 173 case -NFS4ERR_SHARE_DENIED: 174 return -EACCES; 175 case -NFS4ERR_MINOR_VERS_MISMATCH: 176 return -EPROTONOSUPPORT; 177 case -NFS4ERR_FILE_OPEN: 178 return -EBUSY; 179 default: 180 dprintk("%s could not handle NFSv4 error %d\n", 181 __func__, -err); 182 break; 183 } 184 return -EIO; 185 } 186 187 /* 188 * This is our standard bitmap for GETATTR requests. 189 */ 190 const u32 nfs4_fattr_bitmap[3] = { 191 FATTR4_WORD0_TYPE 192 | FATTR4_WORD0_CHANGE 193 | FATTR4_WORD0_SIZE 194 | FATTR4_WORD0_FSID 195 | FATTR4_WORD0_FILEID, 196 FATTR4_WORD1_MODE 197 | FATTR4_WORD1_NUMLINKS 198 | FATTR4_WORD1_OWNER 199 | FATTR4_WORD1_OWNER_GROUP 200 | FATTR4_WORD1_RAWDEV 201 | FATTR4_WORD1_SPACE_USED 202 | FATTR4_WORD1_TIME_ACCESS 203 | FATTR4_WORD1_TIME_METADATA 204 | FATTR4_WORD1_TIME_MODIFY 205 | FATTR4_WORD1_MOUNTED_ON_FILEID, 206 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 207 FATTR4_WORD2_SECURITY_LABEL 208 #endif 209 }; 210 211 static const u32 nfs4_pnfs_open_bitmap[3] = { 212 FATTR4_WORD0_TYPE 213 | FATTR4_WORD0_CHANGE 214 | FATTR4_WORD0_SIZE 215 | FATTR4_WORD0_FSID 216 | FATTR4_WORD0_FILEID, 217 FATTR4_WORD1_MODE 218 | FATTR4_WORD1_NUMLINKS 219 | FATTR4_WORD1_OWNER 220 | FATTR4_WORD1_OWNER_GROUP 221 | FATTR4_WORD1_RAWDEV 222 | FATTR4_WORD1_SPACE_USED 223 | FATTR4_WORD1_TIME_ACCESS 224 | FATTR4_WORD1_TIME_METADATA 225 | FATTR4_WORD1_TIME_MODIFY, 226 FATTR4_WORD2_MDSTHRESHOLD 227 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 228 | FATTR4_WORD2_SECURITY_LABEL 229 #endif 230 }; 231 232 static const u32 nfs4_open_noattr_bitmap[3] = { 233 FATTR4_WORD0_TYPE 234 | FATTR4_WORD0_FILEID, 235 }; 236 237 const u32 nfs4_statfs_bitmap[3] = { 238 FATTR4_WORD0_FILES_AVAIL 239 | FATTR4_WORD0_FILES_FREE 240 | FATTR4_WORD0_FILES_TOTAL, 241 FATTR4_WORD1_SPACE_AVAIL 242 | FATTR4_WORD1_SPACE_FREE 243 | FATTR4_WORD1_SPACE_TOTAL 244 }; 245 246 const u32 nfs4_pathconf_bitmap[3] = { 247 FATTR4_WORD0_MAXLINK 248 | FATTR4_WORD0_MAXNAME, 249 0 250 }; 251 252 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 253 | FATTR4_WORD0_MAXREAD 254 | FATTR4_WORD0_MAXWRITE 255 | FATTR4_WORD0_LEASE_TIME, 256 FATTR4_WORD1_TIME_DELTA 257 | FATTR4_WORD1_FS_LAYOUT_TYPES, 258 FATTR4_WORD2_LAYOUT_BLKSIZE 259 | FATTR4_WORD2_CLONE_BLKSIZE 260 }; 261 262 const u32 nfs4_fs_locations_bitmap[3] = { 263 FATTR4_WORD0_CHANGE 264 | FATTR4_WORD0_SIZE 265 | FATTR4_WORD0_FSID 266 | FATTR4_WORD0_FILEID 267 | FATTR4_WORD0_FS_LOCATIONS, 268 FATTR4_WORD1_OWNER 269 | FATTR4_WORD1_OWNER_GROUP 270 | FATTR4_WORD1_RAWDEV 271 | FATTR4_WORD1_SPACE_USED 272 | FATTR4_WORD1_TIME_ACCESS 273 | FATTR4_WORD1_TIME_METADATA 274 | FATTR4_WORD1_TIME_MODIFY 275 | FATTR4_WORD1_MOUNTED_ON_FILEID, 276 }; 277 278 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 279 struct inode *inode) 280 { 281 unsigned long cache_validity; 282 283 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 284 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 285 return; 286 287 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 288 if (!(cache_validity & NFS_INO_REVAL_FORCED)) 289 cache_validity &= ~(NFS_INO_INVALID_CHANGE 290 | NFS_INO_INVALID_SIZE); 291 292 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 293 dst[0] &= ~FATTR4_WORD0_SIZE; 294 295 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 296 dst[0] &= ~FATTR4_WORD0_CHANGE; 297 } 298 299 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst, 300 const __u32 *src, struct inode *inode) 301 { 302 nfs4_bitmap_copy_adjust(dst, src, inode); 303 } 304 305 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 306 struct nfs4_readdir_arg *readdir) 307 { 308 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 309 __be32 *start, *p; 310 311 if (cookie > 2) { 312 readdir->cookie = cookie; 313 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 314 return; 315 } 316 317 readdir->cookie = 0; 318 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 319 if (cookie == 2) 320 return; 321 322 /* 323 * NFSv4 servers do not return entries for '.' and '..' 324 * Therefore, we fake these entries here. We let '.' 325 * have cookie 0 and '..' have cookie 1. Note that 326 * when talking to the server, we always send cookie 0 327 * instead of 1 or 2. 328 */ 329 start = p = kmap_atomic(*readdir->pages); 330 331 if (cookie == 0) { 332 *p++ = xdr_one; /* next */ 333 *p++ = xdr_zero; /* cookie, first word */ 334 *p++ = xdr_one; /* cookie, second word */ 335 *p++ = xdr_one; /* entry len */ 336 memcpy(p, ".\0\0\0", 4); /* entry */ 337 p++; 338 *p++ = xdr_one; /* bitmap length */ 339 *p++ = htonl(attrs); /* bitmap */ 340 *p++ = htonl(12); /* attribute buffer length */ 341 *p++ = htonl(NF4DIR); 342 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 343 } 344 345 *p++ = xdr_one; /* next */ 346 *p++ = xdr_zero; /* cookie, first word */ 347 *p++ = xdr_two; /* cookie, second word */ 348 *p++ = xdr_two; /* entry len */ 349 memcpy(p, "..\0\0", 4); /* entry */ 350 p++; 351 *p++ = xdr_one; /* bitmap length */ 352 *p++ = htonl(attrs); /* bitmap */ 353 *p++ = htonl(12); /* attribute buffer length */ 354 *p++ = htonl(NF4DIR); 355 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 356 357 readdir->pgbase = (char *)p - (char *)start; 358 readdir->count -= readdir->pgbase; 359 kunmap_atomic(start); 360 } 361 362 static void nfs4_test_and_free_stateid(struct nfs_server *server, 363 nfs4_stateid *stateid, 364 struct rpc_cred *cred) 365 { 366 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 367 368 ops->test_and_free_expired(server, stateid, cred); 369 } 370 371 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 372 nfs4_stateid *stateid, 373 struct rpc_cred *cred) 374 { 375 stateid->type = NFS4_REVOKED_STATEID_TYPE; 376 nfs4_test_and_free_stateid(server, stateid, cred); 377 } 378 379 static void nfs4_free_revoked_stateid(struct nfs_server *server, 380 const nfs4_stateid *stateid, 381 struct rpc_cred *cred) 382 { 383 nfs4_stateid tmp; 384 385 nfs4_stateid_copy(&tmp, stateid); 386 __nfs4_free_revoked_stateid(server, &tmp, cred); 387 } 388 389 static long nfs4_update_delay(long *timeout) 390 { 391 long ret; 392 if (!timeout) 393 return NFS4_POLL_RETRY_MAX; 394 if (*timeout <= 0) 395 *timeout = NFS4_POLL_RETRY_MIN; 396 if (*timeout > NFS4_POLL_RETRY_MAX) 397 *timeout = NFS4_POLL_RETRY_MAX; 398 ret = *timeout; 399 *timeout <<= 1; 400 return ret; 401 } 402 403 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 404 { 405 int res = 0; 406 407 might_sleep(); 408 409 freezable_schedule_timeout_killable_unsafe( 410 nfs4_update_delay(timeout)); 411 if (fatal_signal_pending(current)) 412 res = -ERESTARTSYS; 413 return res; 414 } 415 416 /* This is the error handling routine for processes that are allowed 417 * to sleep. 418 */ 419 static int nfs4_do_handle_exception(struct nfs_server *server, 420 int errorcode, struct nfs4_exception *exception) 421 { 422 struct nfs_client *clp = server->nfs_client; 423 struct nfs4_state *state = exception->state; 424 const nfs4_stateid *stateid = exception->stateid; 425 struct inode *inode = exception->inode; 426 int ret = errorcode; 427 428 exception->delay = 0; 429 exception->recovering = 0; 430 exception->retry = 0; 431 432 if (stateid == NULL && state != NULL) 433 stateid = &state->stateid; 434 435 switch(errorcode) { 436 case 0: 437 return 0; 438 case -NFS4ERR_BADHANDLE: 439 case -ESTALE: 440 if (inode != NULL && S_ISREG(inode->i_mode)) 441 pnfs_destroy_layout(NFS_I(inode)); 442 break; 443 case -NFS4ERR_DELEG_REVOKED: 444 case -NFS4ERR_ADMIN_REVOKED: 445 case -NFS4ERR_EXPIRED: 446 case -NFS4ERR_BAD_STATEID: 447 if (inode != NULL && stateid != NULL) { 448 nfs_inode_find_state_and_recover(inode, 449 stateid); 450 goto wait_on_recovery; 451 } 452 case -NFS4ERR_OPENMODE: 453 if (inode) { 454 int err; 455 456 err = nfs_async_inode_return_delegation(inode, 457 stateid); 458 if (err == 0) 459 goto wait_on_recovery; 460 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 461 exception->retry = 1; 462 break; 463 } 464 } 465 if (state == NULL) 466 break; 467 ret = nfs4_schedule_stateid_recovery(server, state); 468 if (ret < 0) 469 break; 470 goto wait_on_recovery; 471 case -NFS4ERR_STALE_STATEID: 472 case -NFS4ERR_STALE_CLIENTID: 473 nfs4_schedule_lease_recovery(clp); 474 goto wait_on_recovery; 475 case -NFS4ERR_MOVED: 476 ret = nfs4_schedule_migration_recovery(server); 477 if (ret < 0) 478 break; 479 goto wait_on_recovery; 480 case -NFS4ERR_LEASE_MOVED: 481 nfs4_schedule_lease_moved_recovery(clp); 482 goto wait_on_recovery; 483 #if defined(CONFIG_NFS_V4_1) 484 case -NFS4ERR_BADSESSION: 485 case -NFS4ERR_BADSLOT: 486 case -NFS4ERR_BAD_HIGH_SLOT: 487 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 488 case -NFS4ERR_DEADSESSION: 489 case -NFS4ERR_SEQ_FALSE_RETRY: 490 case -NFS4ERR_SEQ_MISORDERED: 491 dprintk("%s ERROR: %d Reset session\n", __func__, 492 errorcode); 493 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 494 goto wait_on_recovery; 495 #endif /* defined(CONFIG_NFS_V4_1) */ 496 case -NFS4ERR_FILE_OPEN: 497 if (exception->timeout > HZ) { 498 /* We have retried a decent amount, time to 499 * fail 500 */ 501 ret = -EBUSY; 502 break; 503 } 504 case -NFS4ERR_DELAY: 505 nfs_inc_server_stats(server, NFSIOS_DELAY); 506 case -NFS4ERR_GRACE: 507 case -NFS4ERR_LAYOUTTRYLATER: 508 case -NFS4ERR_RECALLCONFLICT: 509 exception->delay = 1; 510 return 0; 511 512 case -NFS4ERR_RETRY_UNCACHED_REP: 513 case -NFS4ERR_OLD_STATEID: 514 exception->retry = 1; 515 break; 516 case -NFS4ERR_BADOWNER: 517 /* The following works around a Linux server bug! */ 518 case -NFS4ERR_BADNAME: 519 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 520 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 521 exception->retry = 1; 522 printk(KERN_WARNING "NFS: v4 server %s " 523 "does not accept raw " 524 "uid/gids. " 525 "Reenabling the idmapper.\n", 526 server->nfs_client->cl_hostname); 527 } 528 } 529 /* We failed to handle the error */ 530 return nfs4_map_errors(ret); 531 wait_on_recovery: 532 exception->recovering = 1; 533 return 0; 534 } 535 536 /* This is the error handling routine for processes that are allowed 537 * to sleep. 538 */ 539 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 540 { 541 struct nfs_client *clp = server->nfs_client; 542 int ret; 543 544 ret = nfs4_do_handle_exception(server, errorcode, exception); 545 if (exception->delay) { 546 ret = nfs4_delay(server->client, &exception->timeout); 547 goto out_retry; 548 } 549 if (exception->recovering) { 550 ret = nfs4_wait_clnt_recover(clp); 551 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 552 return -EIO; 553 goto out_retry; 554 } 555 return ret; 556 out_retry: 557 if (ret == 0) 558 exception->retry = 1; 559 return ret; 560 } 561 562 static int 563 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 564 int errorcode, struct nfs4_exception *exception) 565 { 566 struct nfs_client *clp = server->nfs_client; 567 int ret; 568 569 ret = nfs4_do_handle_exception(server, errorcode, exception); 570 if (exception->delay) { 571 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 572 goto out_retry; 573 } 574 if (exception->recovering) { 575 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 576 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 577 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 578 goto out_retry; 579 } 580 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 581 ret = -EIO; 582 return ret; 583 out_retry: 584 if (ret == 0) 585 exception->retry = 1; 586 return ret; 587 } 588 589 static int 590 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 591 struct nfs4_state *state, long *timeout) 592 { 593 struct nfs4_exception exception = { 594 .state = state, 595 }; 596 597 if (task->tk_status >= 0) 598 return 0; 599 if (timeout) 600 exception.timeout = *timeout; 601 task->tk_status = nfs4_async_handle_exception(task, server, 602 task->tk_status, 603 &exception); 604 if (exception.delay && timeout) 605 *timeout = exception.timeout; 606 if (exception.retry) 607 return -EAGAIN; 608 return 0; 609 } 610 611 /* 612 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 613 * or 'false' otherwise. 614 */ 615 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 616 { 617 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 618 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 619 } 620 621 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 622 { 623 spin_lock(&clp->cl_lock); 624 if (time_before(clp->cl_last_renewal,timestamp)) 625 clp->cl_last_renewal = timestamp; 626 spin_unlock(&clp->cl_lock); 627 } 628 629 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 630 { 631 struct nfs_client *clp = server->nfs_client; 632 633 if (!nfs4_has_session(clp)) 634 do_renew_lease(clp, timestamp); 635 } 636 637 struct nfs4_call_sync_data { 638 const struct nfs_server *seq_server; 639 struct nfs4_sequence_args *seq_args; 640 struct nfs4_sequence_res *seq_res; 641 }; 642 643 void nfs4_init_sequence(struct nfs4_sequence_args *args, 644 struct nfs4_sequence_res *res, int cache_reply, 645 int privileged) 646 { 647 args->sa_slot = NULL; 648 args->sa_cache_this = cache_reply; 649 args->sa_privileged = privileged; 650 651 res->sr_slot = NULL; 652 } 653 654 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 655 { 656 struct nfs4_slot *slot = res->sr_slot; 657 struct nfs4_slot_table *tbl; 658 659 tbl = slot->table; 660 spin_lock(&tbl->slot_tbl_lock); 661 if (!nfs41_wake_and_assign_slot(tbl, slot)) 662 nfs4_free_slot(tbl, slot); 663 spin_unlock(&tbl->slot_tbl_lock); 664 665 res->sr_slot = NULL; 666 } 667 668 static int nfs40_sequence_done(struct rpc_task *task, 669 struct nfs4_sequence_res *res) 670 { 671 if (res->sr_slot != NULL) 672 nfs40_sequence_free_slot(res); 673 return 1; 674 } 675 676 #if defined(CONFIG_NFS_V4_1) 677 678 static void nfs41_release_slot(struct nfs4_slot *slot) 679 { 680 struct nfs4_session *session; 681 struct nfs4_slot_table *tbl; 682 bool send_new_highest_used_slotid = false; 683 684 if (!slot) 685 return; 686 tbl = slot->table; 687 session = tbl->session; 688 689 /* Bump the slot sequence number */ 690 if (slot->seq_done) 691 slot->seq_nr++; 692 slot->seq_done = 0; 693 694 spin_lock(&tbl->slot_tbl_lock); 695 /* Be nice to the server: try to ensure that the last transmitted 696 * value for highest_user_slotid <= target_highest_slotid 697 */ 698 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 699 send_new_highest_used_slotid = true; 700 701 if (nfs41_wake_and_assign_slot(tbl, slot)) { 702 send_new_highest_used_slotid = false; 703 goto out_unlock; 704 } 705 nfs4_free_slot(tbl, slot); 706 707 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 708 send_new_highest_used_slotid = false; 709 out_unlock: 710 spin_unlock(&tbl->slot_tbl_lock); 711 if (send_new_highest_used_slotid) 712 nfs41_notify_server(session->clp); 713 if (waitqueue_active(&tbl->slot_waitq)) 714 wake_up_all(&tbl->slot_waitq); 715 } 716 717 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 718 { 719 nfs41_release_slot(res->sr_slot); 720 res->sr_slot = NULL; 721 } 722 723 static int nfs41_sequence_process(struct rpc_task *task, 724 struct nfs4_sequence_res *res) 725 { 726 struct nfs4_session *session; 727 struct nfs4_slot *slot = res->sr_slot; 728 struct nfs_client *clp; 729 bool interrupted = false; 730 int ret = 1; 731 732 if (slot == NULL) 733 goto out_noaction; 734 /* don't increment the sequence number if the task wasn't sent */ 735 if (!RPC_WAS_SENT(task)) 736 goto out; 737 738 session = slot->table->session; 739 740 if (slot->interrupted) { 741 if (res->sr_status != -NFS4ERR_DELAY) 742 slot->interrupted = 0; 743 interrupted = true; 744 } 745 746 trace_nfs4_sequence_done(session, res); 747 /* Check the SEQUENCE operation status */ 748 switch (res->sr_status) { 749 case 0: 750 /* Update the slot's sequence and clientid lease timer */ 751 slot->seq_done = 1; 752 clp = session->clp; 753 do_renew_lease(clp, res->sr_timestamp); 754 /* Check sequence flags */ 755 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 756 !!slot->privileged); 757 nfs41_update_target_slotid(slot->table, slot, res); 758 break; 759 case 1: 760 /* 761 * sr_status remains 1 if an RPC level error occurred. 762 * The server may or may not have processed the sequence 763 * operation.. 764 * Mark the slot as having hosted an interrupted RPC call. 765 */ 766 slot->interrupted = 1; 767 goto out; 768 case -NFS4ERR_DELAY: 769 /* The server detected a resend of the RPC call and 770 * returned NFS4ERR_DELAY as per Section 2.10.6.2 771 * of RFC5661. 772 */ 773 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 774 __func__, 775 slot->slot_nr, 776 slot->seq_nr); 777 goto out_retry; 778 case -NFS4ERR_RETRY_UNCACHED_REP: 779 case -NFS4ERR_SEQ_FALSE_RETRY: 780 /* 781 * The server thinks we tried to replay a request. 782 * Retry the call after bumping the sequence ID. 783 */ 784 goto retry_new_seq; 785 case -NFS4ERR_BADSLOT: 786 /* 787 * The slot id we used was probably retired. Try again 788 * using a different slot id. 789 */ 790 if (slot->slot_nr < slot->table->target_highest_slotid) 791 goto session_recover; 792 goto retry_nowait; 793 case -NFS4ERR_SEQ_MISORDERED: 794 /* 795 * Was the last operation on this sequence interrupted? 796 * If so, retry after bumping the sequence number. 797 */ 798 if (interrupted) 799 goto retry_new_seq; 800 /* 801 * Could this slot have been previously retired? 802 * If so, then the server may be expecting seq_nr = 1! 803 */ 804 if (slot->seq_nr != 1) { 805 slot->seq_nr = 1; 806 goto retry_nowait; 807 } 808 goto session_recover; 809 default: 810 /* Just update the slot sequence no. */ 811 slot->seq_done = 1; 812 } 813 out: 814 /* The session may be reset by one of the error handlers. */ 815 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 816 out_noaction: 817 return ret; 818 session_recover: 819 nfs4_schedule_session_recovery(session, res->sr_status); 820 goto retry_nowait; 821 retry_new_seq: 822 ++slot->seq_nr; 823 retry_nowait: 824 if (rpc_restart_call_prepare(task)) { 825 nfs41_sequence_free_slot(res); 826 task->tk_status = 0; 827 ret = 0; 828 } 829 goto out; 830 out_retry: 831 if (!rpc_restart_call(task)) 832 goto out; 833 rpc_delay(task, NFS4_POLL_RETRY_MAX); 834 return 0; 835 } 836 837 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 838 { 839 if (!nfs41_sequence_process(task, res)) 840 return 0; 841 if (res->sr_slot != NULL) 842 nfs41_sequence_free_slot(res); 843 return 1; 844 845 } 846 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 847 848 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 849 { 850 if (res->sr_slot == NULL) 851 return 1; 852 if (res->sr_slot->table->session != NULL) 853 return nfs41_sequence_process(task, res); 854 return nfs40_sequence_done(task, res); 855 } 856 857 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 858 { 859 if (res->sr_slot != NULL) { 860 if (res->sr_slot->table->session != NULL) 861 nfs41_sequence_free_slot(res); 862 else 863 nfs40_sequence_free_slot(res); 864 } 865 } 866 867 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 868 { 869 if (res->sr_slot == NULL) 870 return 1; 871 if (!res->sr_slot->table->session) 872 return nfs40_sequence_done(task, res); 873 return nfs41_sequence_done(task, res); 874 } 875 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 876 877 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 878 { 879 struct nfs4_call_sync_data *data = calldata; 880 881 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 882 883 nfs4_setup_sequence(data->seq_server->nfs_client, 884 data->seq_args, data->seq_res, task); 885 } 886 887 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 888 { 889 struct nfs4_call_sync_data *data = calldata; 890 891 nfs41_sequence_done(task, data->seq_res); 892 } 893 894 static const struct rpc_call_ops nfs41_call_sync_ops = { 895 .rpc_call_prepare = nfs41_call_sync_prepare, 896 .rpc_call_done = nfs41_call_sync_done, 897 }; 898 899 static void 900 nfs4_sequence_process_interrupted(struct nfs_client *client, 901 struct nfs4_slot *slot, struct rpc_cred *cred) 902 { 903 struct rpc_task *task; 904 905 task = _nfs41_proc_sequence(client, cred, slot, true); 906 if (!IS_ERR(task)) 907 rpc_put_task_async(task); 908 } 909 910 #else /* !CONFIG_NFS_V4_1 */ 911 912 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 913 { 914 return nfs40_sequence_done(task, res); 915 } 916 917 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 918 { 919 if (res->sr_slot != NULL) 920 nfs40_sequence_free_slot(res); 921 } 922 923 int nfs4_sequence_done(struct rpc_task *task, 924 struct nfs4_sequence_res *res) 925 { 926 return nfs40_sequence_done(task, res); 927 } 928 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 929 930 static void 931 nfs4_sequence_process_interrupted(struct nfs_client *client, 932 struct nfs4_slot *slot, struct rpc_cred *cred) 933 { 934 WARN_ON_ONCE(1); 935 slot->interrupted = 0; 936 } 937 938 #endif /* !CONFIG_NFS_V4_1 */ 939 940 static 941 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 942 struct nfs4_sequence_res *res, 943 struct nfs4_slot *slot) 944 { 945 if (!slot) 946 return; 947 slot->privileged = args->sa_privileged ? 1 : 0; 948 args->sa_slot = slot; 949 950 res->sr_slot = slot; 951 res->sr_timestamp = jiffies; 952 res->sr_status_flags = 0; 953 res->sr_status = 1; 954 955 } 956 957 int nfs4_setup_sequence(struct nfs_client *client, 958 struct nfs4_sequence_args *args, 959 struct nfs4_sequence_res *res, 960 struct rpc_task *task) 961 { 962 struct nfs4_session *session = nfs4_get_session(client); 963 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 964 struct nfs4_slot *slot; 965 966 /* slot already allocated? */ 967 if (res->sr_slot != NULL) 968 goto out_start; 969 970 if (session) { 971 tbl = &session->fc_slot_table; 972 task->tk_timeout = 0; 973 } 974 975 for (;;) { 976 spin_lock(&tbl->slot_tbl_lock); 977 /* The state manager will wait until the slot table is empty */ 978 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 979 goto out_sleep; 980 981 slot = nfs4_alloc_slot(tbl); 982 if (IS_ERR(slot)) { 983 /* Try again in 1/4 second */ 984 if (slot == ERR_PTR(-ENOMEM)) 985 task->tk_timeout = HZ >> 2; 986 goto out_sleep; 987 } 988 spin_unlock(&tbl->slot_tbl_lock); 989 990 if (likely(!slot->interrupted)) 991 break; 992 nfs4_sequence_process_interrupted(client, 993 slot, task->tk_msg.rpc_cred); 994 } 995 996 nfs4_sequence_attach_slot(args, res, slot); 997 998 trace_nfs4_setup_sequence(session, args); 999 out_start: 1000 rpc_call_start(task); 1001 return 0; 1002 1003 out_sleep: 1004 if (args->sa_privileged) 1005 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1006 NULL, RPC_PRIORITY_PRIVILEGED); 1007 else 1008 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1009 spin_unlock(&tbl->slot_tbl_lock); 1010 return -EAGAIN; 1011 } 1012 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1013 1014 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1015 { 1016 struct nfs4_call_sync_data *data = calldata; 1017 nfs4_setup_sequence(data->seq_server->nfs_client, 1018 data->seq_args, data->seq_res, task); 1019 } 1020 1021 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1022 { 1023 struct nfs4_call_sync_data *data = calldata; 1024 nfs4_sequence_done(task, data->seq_res); 1025 } 1026 1027 static const struct rpc_call_ops nfs40_call_sync_ops = { 1028 .rpc_call_prepare = nfs40_call_sync_prepare, 1029 .rpc_call_done = nfs40_call_sync_done, 1030 }; 1031 1032 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1033 struct nfs_server *server, 1034 struct rpc_message *msg, 1035 struct nfs4_sequence_args *args, 1036 struct nfs4_sequence_res *res) 1037 { 1038 int ret; 1039 struct rpc_task *task; 1040 struct nfs_client *clp = server->nfs_client; 1041 struct nfs4_call_sync_data data = { 1042 .seq_server = server, 1043 .seq_args = args, 1044 .seq_res = res, 1045 }; 1046 struct rpc_task_setup task_setup = { 1047 .rpc_client = clnt, 1048 .rpc_message = msg, 1049 .callback_ops = clp->cl_mvops->call_sync_ops, 1050 .callback_data = &data 1051 }; 1052 1053 task = rpc_run_task(&task_setup); 1054 if (IS_ERR(task)) 1055 ret = PTR_ERR(task); 1056 else { 1057 ret = task->tk_status; 1058 rpc_put_task(task); 1059 } 1060 return ret; 1061 } 1062 1063 int nfs4_call_sync(struct rpc_clnt *clnt, 1064 struct nfs_server *server, 1065 struct rpc_message *msg, 1066 struct nfs4_sequence_args *args, 1067 struct nfs4_sequence_res *res, 1068 int cache_reply) 1069 { 1070 nfs4_init_sequence(args, res, cache_reply, 0); 1071 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1072 } 1073 1074 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1075 unsigned long timestamp) 1076 { 1077 struct nfs_inode *nfsi = NFS_I(dir); 1078 1079 spin_lock(&dir->i_lock); 1080 nfsi->cache_validity |= NFS_INO_INVALID_CTIME 1081 | NFS_INO_INVALID_MTIME 1082 | NFS_INO_INVALID_DATA; 1083 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) { 1084 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; 1085 nfsi->attrtimeo_timestamp = jiffies; 1086 } else { 1087 nfs_force_lookup_revalidate(dir); 1088 if (cinfo->before != inode_peek_iversion_raw(dir)) 1089 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | 1090 NFS_INO_INVALID_ACL; 1091 } 1092 inode_set_iversion_raw(dir, cinfo->after); 1093 nfsi->read_cache_jiffies = timestamp; 1094 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1095 nfs_fscache_invalidate(dir); 1096 spin_unlock(&dir->i_lock); 1097 } 1098 1099 struct nfs4_open_createattrs { 1100 struct nfs4_label *label; 1101 struct iattr *sattr; 1102 const __u32 verf[2]; 1103 }; 1104 1105 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1106 int err, struct nfs4_exception *exception) 1107 { 1108 if (err != -EINVAL) 1109 return false; 1110 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1111 return false; 1112 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1113 exception->retry = 1; 1114 return true; 1115 } 1116 1117 static u32 1118 nfs4_map_atomic_open_share(struct nfs_server *server, 1119 fmode_t fmode, int openflags) 1120 { 1121 u32 res = 0; 1122 1123 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1124 case FMODE_READ: 1125 res = NFS4_SHARE_ACCESS_READ; 1126 break; 1127 case FMODE_WRITE: 1128 res = NFS4_SHARE_ACCESS_WRITE; 1129 break; 1130 case FMODE_READ|FMODE_WRITE: 1131 res = NFS4_SHARE_ACCESS_BOTH; 1132 } 1133 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1134 goto out; 1135 /* Want no delegation if we're using O_DIRECT */ 1136 if (openflags & O_DIRECT) 1137 res |= NFS4_SHARE_WANT_NO_DELEG; 1138 out: 1139 return res; 1140 } 1141 1142 static enum open_claim_type4 1143 nfs4_map_atomic_open_claim(struct nfs_server *server, 1144 enum open_claim_type4 claim) 1145 { 1146 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1147 return claim; 1148 switch (claim) { 1149 default: 1150 return claim; 1151 case NFS4_OPEN_CLAIM_FH: 1152 return NFS4_OPEN_CLAIM_NULL; 1153 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1154 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1155 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1156 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1157 } 1158 } 1159 1160 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1161 { 1162 p->o_res.f_attr = &p->f_attr; 1163 p->o_res.f_label = p->f_label; 1164 p->o_res.seqid = p->o_arg.seqid; 1165 p->c_res.seqid = p->c_arg.seqid; 1166 p->o_res.server = p->o_arg.server; 1167 p->o_res.access_request = p->o_arg.access; 1168 nfs_fattr_init(&p->f_attr); 1169 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1170 } 1171 1172 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1173 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1174 const struct nfs4_open_createattrs *c, 1175 enum open_claim_type4 claim, 1176 gfp_t gfp_mask) 1177 { 1178 struct dentry *parent = dget_parent(dentry); 1179 struct inode *dir = d_inode(parent); 1180 struct nfs_server *server = NFS_SERVER(dir); 1181 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1182 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1183 struct nfs4_opendata *p; 1184 1185 p = kzalloc(sizeof(*p), gfp_mask); 1186 if (p == NULL) 1187 goto err; 1188 1189 p->f_label = nfs4_label_alloc(server, gfp_mask); 1190 if (IS_ERR(p->f_label)) 1191 goto err_free_p; 1192 1193 p->a_label = nfs4_label_alloc(server, gfp_mask); 1194 if (IS_ERR(p->a_label)) 1195 goto err_free_f; 1196 1197 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1198 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1199 if (IS_ERR(p->o_arg.seqid)) 1200 goto err_free_label; 1201 nfs_sb_active(dentry->d_sb); 1202 p->dentry = dget(dentry); 1203 p->dir = parent; 1204 p->owner = sp; 1205 atomic_inc(&sp->so_count); 1206 p->o_arg.open_flags = flags; 1207 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1208 p->o_arg.umask = current_umask(); 1209 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1210 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1211 fmode, flags); 1212 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1213 * will return permission denied for all bits until close */ 1214 if (!(flags & O_EXCL)) { 1215 /* ask server to check for all possible rights as results 1216 * are cached */ 1217 switch (p->o_arg.claim) { 1218 default: 1219 break; 1220 case NFS4_OPEN_CLAIM_NULL: 1221 case NFS4_OPEN_CLAIM_FH: 1222 p->o_arg.access = NFS4_ACCESS_READ | 1223 NFS4_ACCESS_MODIFY | 1224 NFS4_ACCESS_EXTEND | 1225 NFS4_ACCESS_EXECUTE; 1226 } 1227 } 1228 p->o_arg.clientid = server->nfs_client->cl_clientid; 1229 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1230 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1231 p->o_arg.name = &dentry->d_name; 1232 p->o_arg.server = server; 1233 p->o_arg.bitmask = nfs4_bitmask(server, label); 1234 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1235 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1236 switch (p->o_arg.claim) { 1237 case NFS4_OPEN_CLAIM_NULL: 1238 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1239 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1240 p->o_arg.fh = NFS_FH(dir); 1241 break; 1242 case NFS4_OPEN_CLAIM_PREVIOUS: 1243 case NFS4_OPEN_CLAIM_FH: 1244 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1245 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1246 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1247 } 1248 if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) { 1249 p->o_arg.u.attrs = &p->attrs; 1250 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1251 1252 memcpy(p->o_arg.u.verifier.data, c->verf, 1253 sizeof(p->o_arg.u.verifier.data)); 1254 } 1255 p->c_arg.fh = &p->o_res.fh; 1256 p->c_arg.stateid = &p->o_res.stateid; 1257 p->c_arg.seqid = p->o_arg.seqid; 1258 nfs4_init_opendata_res(p); 1259 kref_init(&p->kref); 1260 return p; 1261 1262 err_free_label: 1263 nfs4_label_free(p->a_label); 1264 err_free_f: 1265 nfs4_label_free(p->f_label); 1266 err_free_p: 1267 kfree(p); 1268 err: 1269 dput(parent); 1270 return NULL; 1271 } 1272 1273 static void nfs4_opendata_free(struct kref *kref) 1274 { 1275 struct nfs4_opendata *p = container_of(kref, 1276 struct nfs4_opendata, kref); 1277 struct super_block *sb = p->dentry->d_sb; 1278 1279 nfs4_lgopen_release(p->lgp); 1280 nfs_free_seqid(p->o_arg.seqid); 1281 nfs4_sequence_free_slot(&p->o_res.seq_res); 1282 if (p->state != NULL) 1283 nfs4_put_open_state(p->state); 1284 nfs4_put_state_owner(p->owner); 1285 1286 nfs4_label_free(p->a_label); 1287 nfs4_label_free(p->f_label); 1288 1289 dput(p->dir); 1290 dput(p->dentry); 1291 nfs_sb_deactive(sb); 1292 nfs_fattr_free_names(&p->f_attr); 1293 kfree(p->f_attr.mdsthreshold); 1294 kfree(p); 1295 } 1296 1297 static void nfs4_opendata_put(struct nfs4_opendata *p) 1298 { 1299 if (p != NULL) 1300 kref_put(&p->kref, nfs4_opendata_free); 1301 } 1302 1303 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1304 fmode_t fmode) 1305 { 1306 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1307 case FMODE_READ|FMODE_WRITE: 1308 return state->n_rdwr != 0; 1309 case FMODE_WRITE: 1310 return state->n_wronly != 0; 1311 case FMODE_READ: 1312 return state->n_rdonly != 0; 1313 } 1314 WARN_ON_ONCE(1); 1315 return false; 1316 } 1317 1318 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1319 { 1320 int ret = 0; 1321 1322 if (open_mode & (O_EXCL|O_TRUNC)) 1323 goto out; 1324 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1325 case FMODE_READ: 1326 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1327 && state->n_rdonly != 0; 1328 break; 1329 case FMODE_WRITE: 1330 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1331 && state->n_wronly != 0; 1332 break; 1333 case FMODE_READ|FMODE_WRITE: 1334 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1335 && state->n_rdwr != 0; 1336 } 1337 out: 1338 return ret; 1339 } 1340 1341 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1342 enum open_claim_type4 claim) 1343 { 1344 if (delegation == NULL) 1345 return 0; 1346 if ((delegation->type & fmode) != fmode) 1347 return 0; 1348 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1349 return 0; 1350 switch (claim) { 1351 case NFS4_OPEN_CLAIM_NULL: 1352 case NFS4_OPEN_CLAIM_FH: 1353 break; 1354 case NFS4_OPEN_CLAIM_PREVIOUS: 1355 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1356 break; 1357 default: 1358 return 0; 1359 } 1360 nfs_mark_delegation_referenced(delegation); 1361 return 1; 1362 } 1363 1364 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1365 { 1366 switch (fmode) { 1367 case FMODE_WRITE: 1368 state->n_wronly++; 1369 break; 1370 case FMODE_READ: 1371 state->n_rdonly++; 1372 break; 1373 case FMODE_READ|FMODE_WRITE: 1374 state->n_rdwr++; 1375 } 1376 nfs4_state_set_mode_locked(state, state->state | fmode); 1377 } 1378 1379 #ifdef CONFIG_NFS_V4_1 1380 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1381 { 1382 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1383 return true; 1384 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1385 return true; 1386 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1387 return true; 1388 return false; 1389 } 1390 #endif /* CONFIG_NFS_V4_1 */ 1391 1392 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1393 { 1394 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1395 wake_up_all(&state->waitq); 1396 } 1397 1398 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state, 1399 const nfs4_stateid *stateid) 1400 { 1401 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid); 1402 u32 stateid_seqid = be32_to_cpu(stateid->seqid); 1403 1404 if (stateid_seqid == state_seqid + 1U || 1405 (stateid_seqid == 1U && state_seqid == 0xffffffffU)) 1406 nfs_state_log_update_open_stateid(state); 1407 else 1408 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1409 } 1410 1411 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1412 { 1413 struct nfs_client *clp = state->owner->so_server->nfs_client; 1414 bool need_recover = false; 1415 1416 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1417 need_recover = true; 1418 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1419 need_recover = true; 1420 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1421 need_recover = true; 1422 if (need_recover) 1423 nfs4_state_mark_reclaim_nograce(clp, state); 1424 } 1425 1426 /* 1427 * Check for whether or not the caller may update the open stateid 1428 * to the value passed in by stateid. 1429 * 1430 * Note: This function relies heavily on the server implementing 1431 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1432 * correctly. 1433 * i.e. The stateid seqids have to be initialised to 1, and 1434 * are then incremented on every state transition. 1435 */ 1436 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1437 const nfs4_stateid *stateid) 1438 { 1439 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 || 1440 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1441 if (stateid->seqid == cpu_to_be32(1)) 1442 nfs_state_log_update_open_stateid(state); 1443 else 1444 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1445 return true; 1446 } 1447 1448 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1449 nfs_state_log_out_of_order_open_stateid(state, stateid); 1450 return true; 1451 } 1452 return false; 1453 } 1454 1455 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1456 { 1457 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1458 return; 1459 if (state->n_wronly) 1460 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1461 if (state->n_rdonly) 1462 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1463 if (state->n_rdwr) 1464 set_bit(NFS_O_RDWR_STATE, &state->flags); 1465 set_bit(NFS_OPEN_STATE, &state->flags); 1466 } 1467 1468 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1469 nfs4_stateid *stateid, fmode_t fmode) 1470 { 1471 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1472 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1473 case FMODE_WRITE: 1474 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1475 break; 1476 case FMODE_READ: 1477 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1478 break; 1479 case 0: 1480 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1481 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1482 clear_bit(NFS_OPEN_STATE, &state->flags); 1483 } 1484 if (stateid == NULL) 1485 return; 1486 /* Handle OPEN+OPEN_DOWNGRADE races */ 1487 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1488 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1489 nfs_resync_open_stateid_locked(state); 1490 goto out; 1491 } 1492 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1493 nfs4_stateid_copy(&state->stateid, stateid); 1494 nfs4_stateid_copy(&state->open_stateid, stateid); 1495 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1496 out: 1497 nfs_state_log_update_open_stateid(state); 1498 } 1499 1500 static void nfs_clear_open_stateid(struct nfs4_state *state, 1501 nfs4_stateid *arg_stateid, 1502 nfs4_stateid *stateid, fmode_t fmode) 1503 { 1504 write_seqlock(&state->seqlock); 1505 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1506 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1507 nfs_clear_open_stateid_locked(state, stateid, fmode); 1508 write_sequnlock(&state->seqlock); 1509 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1510 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1511 } 1512 1513 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1514 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1515 { 1516 DEFINE_WAIT(wait); 1517 int status = 0; 1518 for (;;) { 1519 1520 if (!nfs_need_update_open_stateid(state, stateid)) 1521 return; 1522 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1523 break; 1524 if (status) 1525 break; 1526 /* Rely on seqids for serialisation with NFSv4.0 */ 1527 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1528 break; 1529 1530 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1531 /* 1532 * Ensure we process the state changes in the same order 1533 * in which the server processed them by delaying the 1534 * update of the stateid until we are in sequence. 1535 */ 1536 write_sequnlock(&state->seqlock); 1537 spin_unlock(&state->owner->so_lock); 1538 rcu_read_unlock(); 1539 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1540 if (!signal_pending(current)) { 1541 if (schedule_timeout(5*HZ) == 0) 1542 status = -EAGAIN; 1543 else 1544 status = 0; 1545 } else 1546 status = -EINTR; 1547 finish_wait(&state->waitq, &wait); 1548 rcu_read_lock(); 1549 spin_lock(&state->owner->so_lock); 1550 write_seqlock(&state->seqlock); 1551 } 1552 1553 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1554 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1555 nfs4_stateid_copy(freeme, &state->open_stateid); 1556 nfs_test_and_clear_all_open_stateid(state); 1557 } 1558 1559 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1560 nfs4_stateid_copy(&state->stateid, stateid); 1561 nfs4_stateid_copy(&state->open_stateid, stateid); 1562 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1563 nfs_state_log_update_open_stateid(state); 1564 } 1565 1566 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1567 const nfs4_stateid *open_stateid, 1568 fmode_t fmode, 1569 nfs4_stateid *freeme) 1570 { 1571 /* 1572 * Protect the call to nfs4_state_set_mode_locked and 1573 * serialise the stateid update 1574 */ 1575 write_seqlock(&state->seqlock); 1576 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1577 switch (fmode) { 1578 case FMODE_READ: 1579 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1580 break; 1581 case FMODE_WRITE: 1582 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1583 break; 1584 case FMODE_READ|FMODE_WRITE: 1585 set_bit(NFS_O_RDWR_STATE, &state->flags); 1586 } 1587 set_bit(NFS_OPEN_STATE, &state->flags); 1588 write_sequnlock(&state->seqlock); 1589 } 1590 1591 static void nfs_state_set_delegation(struct nfs4_state *state, 1592 const nfs4_stateid *deleg_stateid, 1593 fmode_t fmode) 1594 { 1595 /* 1596 * Protect the call to nfs4_state_set_mode_locked and 1597 * serialise the stateid update 1598 */ 1599 write_seqlock(&state->seqlock); 1600 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1601 set_bit(NFS_DELEGATED_STATE, &state->flags); 1602 write_sequnlock(&state->seqlock); 1603 } 1604 1605 static int update_open_stateid(struct nfs4_state *state, 1606 const nfs4_stateid *open_stateid, 1607 const nfs4_stateid *delegation, 1608 fmode_t fmode) 1609 { 1610 struct nfs_server *server = NFS_SERVER(state->inode); 1611 struct nfs_client *clp = server->nfs_client; 1612 struct nfs_inode *nfsi = NFS_I(state->inode); 1613 struct nfs_delegation *deleg_cur; 1614 nfs4_stateid freeme = { }; 1615 int ret = 0; 1616 1617 fmode &= (FMODE_READ|FMODE_WRITE); 1618 1619 rcu_read_lock(); 1620 spin_lock(&state->owner->so_lock); 1621 if (open_stateid != NULL) { 1622 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1623 ret = 1; 1624 } 1625 1626 deleg_cur = rcu_dereference(nfsi->delegation); 1627 if (deleg_cur == NULL) 1628 goto no_delegation; 1629 1630 spin_lock(&deleg_cur->lock); 1631 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1632 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1633 (deleg_cur->type & fmode) != fmode) 1634 goto no_delegation_unlock; 1635 1636 if (delegation == NULL) 1637 delegation = &deleg_cur->stateid; 1638 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1639 goto no_delegation_unlock; 1640 1641 nfs_mark_delegation_referenced(deleg_cur); 1642 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1643 ret = 1; 1644 no_delegation_unlock: 1645 spin_unlock(&deleg_cur->lock); 1646 no_delegation: 1647 if (ret) 1648 update_open_stateflags(state, fmode); 1649 spin_unlock(&state->owner->so_lock); 1650 rcu_read_unlock(); 1651 1652 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1653 nfs4_schedule_state_manager(clp); 1654 if (freeme.type != 0) 1655 nfs4_test_and_free_stateid(server, &freeme, 1656 state->owner->so_cred); 1657 1658 return ret; 1659 } 1660 1661 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1662 const nfs4_stateid *stateid) 1663 { 1664 struct nfs4_state *state = lsp->ls_state; 1665 bool ret = false; 1666 1667 spin_lock(&state->state_lock); 1668 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1669 goto out_noupdate; 1670 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1671 goto out_noupdate; 1672 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1673 ret = true; 1674 out_noupdate: 1675 spin_unlock(&state->state_lock); 1676 return ret; 1677 } 1678 1679 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1680 { 1681 struct nfs_delegation *delegation; 1682 1683 fmode &= FMODE_READ|FMODE_WRITE; 1684 rcu_read_lock(); 1685 delegation = rcu_dereference(NFS_I(inode)->delegation); 1686 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1687 rcu_read_unlock(); 1688 return; 1689 } 1690 rcu_read_unlock(); 1691 nfs4_inode_return_delegation(inode); 1692 } 1693 1694 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1695 { 1696 struct nfs4_state *state = opendata->state; 1697 struct nfs_inode *nfsi = NFS_I(state->inode); 1698 struct nfs_delegation *delegation; 1699 int open_mode = opendata->o_arg.open_flags; 1700 fmode_t fmode = opendata->o_arg.fmode; 1701 enum open_claim_type4 claim = opendata->o_arg.claim; 1702 nfs4_stateid stateid; 1703 int ret = -EAGAIN; 1704 1705 for (;;) { 1706 spin_lock(&state->owner->so_lock); 1707 if (can_open_cached(state, fmode, open_mode)) { 1708 update_open_stateflags(state, fmode); 1709 spin_unlock(&state->owner->so_lock); 1710 goto out_return_state; 1711 } 1712 spin_unlock(&state->owner->so_lock); 1713 rcu_read_lock(); 1714 delegation = rcu_dereference(nfsi->delegation); 1715 if (!can_open_delegated(delegation, fmode, claim)) { 1716 rcu_read_unlock(); 1717 break; 1718 } 1719 /* Save the delegation */ 1720 nfs4_stateid_copy(&stateid, &delegation->stateid); 1721 rcu_read_unlock(); 1722 nfs_release_seqid(opendata->o_arg.seqid); 1723 if (!opendata->is_recover) { 1724 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1725 if (ret != 0) 1726 goto out; 1727 } 1728 ret = -EAGAIN; 1729 1730 /* Try to update the stateid using the delegation */ 1731 if (update_open_stateid(state, NULL, &stateid, fmode)) 1732 goto out_return_state; 1733 } 1734 out: 1735 return ERR_PTR(ret); 1736 out_return_state: 1737 atomic_inc(&state->count); 1738 return state; 1739 } 1740 1741 static void 1742 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1743 { 1744 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1745 struct nfs_delegation *delegation; 1746 int delegation_flags = 0; 1747 1748 rcu_read_lock(); 1749 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1750 if (delegation) 1751 delegation_flags = delegation->flags; 1752 rcu_read_unlock(); 1753 switch (data->o_arg.claim) { 1754 default: 1755 break; 1756 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1757 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1758 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1759 "returning a delegation for " 1760 "OPEN(CLAIM_DELEGATE_CUR)\n", 1761 clp->cl_hostname); 1762 return; 1763 } 1764 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1765 nfs_inode_set_delegation(state->inode, 1766 data->owner->so_cred, 1767 data->o_res.delegation_type, 1768 &data->o_res.delegation, 1769 data->o_res.pagemod_limit); 1770 else 1771 nfs_inode_reclaim_delegation(state->inode, 1772 data->owner->so_cred, 1773 data->o_res.delegation_type, 1774 &data->o_res.delegation, 1775 data->o_res.pagemod_limit); 1776 } 1777 1778 /* 1779 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1780 * and update the nfs4_state. 1781 */ 1782 static struct nfs4_state * 1783 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1784 { 1785 struct inode *inode = data->state->inode; 1786 struct nfs4_state *state = data->state; 1787 int ret; 1788 1789 if (!data->rpc_done) { 1790 if (data->rpc_status) 1791 return ERR_PTR(data->rpc_status); 1792 /* cached opens have already been processed */ 1793 goto update; 1794 } 1795 1796 ret = nfs_refresh_inode(inode, &data->f_attr); 1797 if (ret) 1798 return ERR_PTR(ret); 1799 1800 if (data->o_res.delegation_type != 0) 1801 nfs4_opendata_check_deleg(data, state); 1802 update: 1803 update_open_stateid(state, &data->o_res.stateid, NULL, 1804 data->o_arg.fmode); 1805 atomic_inc(&state->count); 1806 1807 return state; 1808 } 1809 1810 static struct inode * 1811 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1812 { 1813 struct inode *inode; 1814 1815 switch (data->o_arg.claim) { 1816 case NFS4_OPEN_CLAIM_NULL: 1817 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1818 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1819 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1820 return ERR_PTR(-EAGAIN); 1821 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 1822 &data->f_attr, data->f_label); 1823 break; 1824 default: 1825 inode = d_inode(data->dentry); 1826 ihold(inode); 1827 nfs_refresh_inode(inode, &data->f_attr); 1828 } 1829 return inode; 1830 } 1831 1832 static struct nfs4_state * 1833 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 1834 { 1835 struct nfs4_state *state; 1836 struct inode *inode; 1837 1838 inode = nfs4_opendata_get_inode(data); 1839 if (IS_ERR(inode)) 1840 return ERR_CAST(inode); 1841 if (data->state != NULL && data->state->inode == inode) { 1842 state = data->state; 1843 atomic_inc(&state->count); 1844 } else 1845 state = nfs4_get_open_state(inode, data->owner); 1846 iput(inode); 1847 if (state == NULL) 1848 state = ERR_PTR(-ENOMEM); 1849 return state; 1850 } 1851 1852 static struct nfs4_state * 1853 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1854 { 1855 struct nfs4_state *state; 1856 1857 if (!data->rpc_done) { 1858 state = nfs4_try_open_cached(data); 1859 trace_nfs4_cached_open(data->state); 1860 goto out; 1861 } 1862 1863 state = nfs4_opendata_find_nfs4_state(data); 1864 if (IS_ERR(state)) 1865 goto out; 1866 1867 if (data->o_res.delegation_type != 0) 1868 nfs4_opendata_check_deleg(data, state); 1869 update_open_stateid(state, &data->o_res.stateid, NULL, 1870 data->o_arg.fmode); 1871 out: 1872 nfs_release_seqid(data->o_arg.seqid); 1873 return state; 1874 } 1875 1876 static struct nfs4_state * 1877 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1878 { 1879 struct nfs4_state *ret; 1880 1881 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1882 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 1883 else 1884 ret = _nfs4_opendata_to_nfs4_state(data); 1885 nfs4_sequence_free_slot(&data->o_res.seq_res); 1886 return ret; 1887 } 1888 1889 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1890 { 1891 struct nfs_inode *nfsi = NFS_I(state->inode); 1892 struct nfs_open_context *ctx; 1893 1894 spin_lock(&state->inode->i_lock); 1895 list_for_each_entry(ctx, &nfsi->open_files, list) { 1896 if (ctx->state != state) 1897 continue; 1898 get_nfs_open_context(ctx); 1899 spin_unlock(&state->inode->i_lock); 1900 return ctx; 1901 } 1902 spin_unlock(&state->inode->i_lock); 1903 return ERR_PTR(-ENOENT); 1904 } 1905 1906 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1907 struct nfs4_state *state, enum open_claim_type4 claim) 1908 { 1909 struct nfs4_opendata *opendata; 1910 1911 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1912 NULL, claim, GFP_NOFS); 1913 if (opendata == NULL) 1914 return ERR_PTR(-ENOMEM); 1915 opendata->state = state; 1916 atomic_inc(&state->count); 1917 return opendata; 1918 } 1919 1920 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 1921 fmode_t fmode) 1922 { 1923 struct nfs4_state *newstate; 1924 int ret; 1925 1926 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 1927 return 0; 1928 opendata->o_arg.open_flags = 0; 1929 opendata->o_arg.fmode = fmode; 1930 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 1931 NFS_SB(opendata->dentry->d_sb), 1932 fmode, 0); 1933 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1934 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1935 nfs4_init_opendata_res(opendata); 1936 ret = _nfs4_recover_proc_open(opendata); 1937 if (ret != 0) 1938 return ret; 1939 newstate = nfs4_opendata_to_nfs4_state(opendata); 1940 if (IS_ERR(newstate)) 1941 return PTR_ERR(newstate); 1942 if (newstate != opendata->state) 1943 ret = -ESTALE; 1944 nfs4_close_state(newstate, fmode); 1945 return ret; 1946 } 1947 1948 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1949 { 1950 int ret; 1951 1952 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1953 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1954 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1955 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1956 /* memory barrier prior to reading state->n_* */ 1957 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1958 clear_bit(NFS_OPEN_STATE, &state->flags); 1959 smp_rmb(); 1960 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1961 if (ret != 0) 1962 return ret; 1963 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1964 if (ret != 0) 1965 return ret; 1966 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 1967 if (ret != 0) 1968 return ret; 1969 /* 1970 * We may have performed cached opens for all three recoveries. 1971 * Check if we need to update the current stateid. 1972 */ 1973 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1974 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1975 write_seqlock(&state->seqlock); 1976 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1977 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1978 write_sequnlock(&state->seqlock); 1979 } 1980 return 0; 1981 } 1982 1983 /* 1984 * OPEN_RECLAIM: 1985 * reclaim state on the server after a reboot. 1986 */ 1987 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1988 { 1989 struct nfs_delegation *delegation; 1990 struct nfs4_opendata *opendata; 1991 fmode_t delegation_type = 0; 1992 int status; 1993 1994 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1995 NFS4_OPEN_CLAIM_PREVIOUS); 1996 if (IS_ERR(opendata)) 1997 return PTR_ERR(opendata); 1998 rcu_read_lock(); 1999 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2000 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2001 delegation_type = delegation->type; 2002 rcu_read_unlock(); 2003 opendata->o_arg.u.delegation_type = delegation_type; 2004 status = nfs4_open_recover(opendata, state); 2005 nfs4_opendata_put(opendata); 2006 return status; 2007 } 2008 2009 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2010 { 2011 struct nfs_server *server = NFS_SERVER(state->inode); 2012 struct nfs4_exception exception = { }; 2013 int err; 2014 do { 2015 err = _nfs4_do_open_reclaim(ctx, state); 2016 trace_nfs4_open_reclaim(ctx, 0, err); 2017 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2018 continue; 2019 if (err != -NFS4ERR_DELAY) 2020 break; 2021 nfs4_handle_exception(server, err, &exception); 2022 } while (exception.retry); 2023 return err; 2024 } 2025 2026 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2027 { 2028 struct nfs_open_context *ctx; 2029 int ret; 2030 2031 ctx = nfs4_state_find_open_context(state); 2032 if (IS_ERR(ctx)) 2033 return -EAGAIN; 2034 ret = nfs4_do_open_reclaim(ctx, state); 2035 put_nfs_open_context(ctx); 2036 return ret; 2037 } 2038 2039 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) 2040 { 2041 switch (err) { 2042 default: 2043 printk(KERN_ERR "NFS: %s: unhandled error " 2044 "%d.\n", __func__, err); 2045 case 0: 2046 case -ENOENT: 2047 case -EAGAIN: 2048 case -ESTALE: 2049 break; 2050 case -NFS4ERR_BADSESSION: 2051 case -NFS4ERR_BADSLOT: 2052 case -NFS4ERR_BAD_HIGH_SLOT: 2053 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2054 case -NFS4ERR_DEADSESSION: 2055 set_bit(NFS_DELEGATED_STATE, &state->flags); 2056 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 2057 return -EAGAIN; 2058 case -NFS4ERR_STALE_CLIENTID: 2059 case -NFS4ERR_STALE_STATEID: 2060 set_bit(NFS_DELEGATED_STATE, &state->flags); 2061 /* Don't recall a delegation if it was lost */ 2062 nfs4_schedule_lease_recovery(server->nfs_client); 2063 return -EAGAIN; 2064 case -NFS4ERR_MOVED: 2065 nfs4_schedule_migration_recovery(server); 2066 return -EAGAIN; 2067 case -NFS4ERR_LEASE_MOVED: 2068 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2069 return -EAGAIN; 2070 case -NFS4ERR_DELEG_REVOKED: 2071 case -NFS4ERR_ADMIN_REVOKED: 2072 case -NFS4ERR_EXPIRED: 2073 case -NFS4ERR_BAD_STATEID: 2074 case -NFS4ERR_OPENMODE: 2075 nfs_inode_find_state_and_recover(state->inode, 2076 stateid); 2077 nfs4_schedule_stateid_recovery(server, state); 2078 return -EAGAIN; 2079 case -NFS4ERR_DELAY: 2080 case -NFS4ERR_GRACE: 2081 set_bit(NFS_DELEGATED_STATE, &state->flags); 2082 ssleep(1); 2083 return -EAGAIN; 2084 case -ENOMEM: 2085 case -NFS4ERR_DENIED: 2086 if (fl) { 2087 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2088 if (lsp) 2089 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2090 } 2091 return 0; 2092 } 2093 return err; 2094 } 2095 2096 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2097 struct nfs4_state *state, const nfs4_stateid *stateid, 2098 fmode_t type) 2099 { 2100 struct nfs_server *server = NFS_SERVER(state->inode); 2101 struct nfs4_opendata *opendata; 2102 int err = 0; 2103 2104 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2105 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2106 if (IS_ERR(opendata)) 2107 return PTR_ERR(opendata); 2108 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2109 write_seqlock(&state->seqlock); 2110 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2111 write_sequnlock(&state->seqlock); 2112 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2113 switch (type & (FMODE_READ|FMODE_WRITE)) { 2114 case FMODE_READ|FMODE_WRITE: 2115 case FMODE_WRITE: 2116 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2117 if (err) 2118 break; 2119 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2120 if (err) 2121 break; 2122 case FMODE_READ: 2123 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2124 } 2125 nfs4_opendata_put(opendata); 2126 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2127 } 2128 2129 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2130 { 2131 struct nfs4_opendata *data = calldata; 2132 2133 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2134 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2135 } 2136 2137 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2138 { 2139 struct nfs4_opendata *data = calldata; 2140 2141 nfs40_sequence_done(task, &data->c_res.seq_res); 2142 2143 data->rpc_status = task->tk_status; 2144 if (data->rpc_status == 0) { 2145 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2146 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2147 renew_lease(data->o_res.server, data->timestamp); 2148 data->rpc_done = true; 2149 } 2150 } 2151 2152 static void nfs4_open_confirm_release(void *calldata) 2153 { 2154 struct nfs4_opendata *data = calldata; 2155 struct nfs4_state *state = NULL; 2156 2157 /* If this request hasn't been cancelled, do nothing */ 2158 if (!data->cancelled) 2159 goto out_free; 2160 /* In case of error, no cleanup! */ 2161 if (!data->rpc_done) 2162 goto out_free; 2163 state = nfs4_opendata_to_nfs4_state(data); 2164 if (!IS_ERR(state)) 2165 nfs4_close_state(state, data->o_arg.fmode); 2166 out_free: 2167 nfs4_opendata_put(data); 2168 } 2169 2170 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2171 .rpc_call_prepare = nfs4_open_confirm_prepare, 2172 .rpc_call_done = nfs4_open_confirm_done, 2173 .rpc_release = nfs4_open_confirm_release, 2174 }; 2175 2176 /* 2177 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2178 */ 2179 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2180 { 2181 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2182 struct rpc_task *task; 2183 struct rpc_message msg = { 2184 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2185 .rpc_argp = &data->c_arg, 2186 .rpc_resp = &data->c_res, 2187 .rpc_cred = data->owner->so_cred, 2188 }; 2189 struct rpc_task_setup task_setup_data = { 2190 .rpc_client = server->client, 2191 .rpc_message = &msg, 2192 .callback_ops = &nfs4_open_confirm_ops, 2193 .callback_data = data, 2194 .workqueue = nfsiod_workqueue, 2195 .flags = RPC_TASK_ASYNC, 2196 }; 2197 int status; 2198 2199 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2200 data->is_recover); 2201 kref_get(&data->kref); 2202 data->rpc_done = false; 2203 data->rpc_status = 0; 2204 data->timestamp = jiffies; 2205 task = rpc_run_task(&task_setup_data); 2206 if (IS_ERR(task)) 2207 return PTR_ERR(task); 2208 status = rpc_wait_for_completion_task(task); 2209 if (status != 0) { 2210 data->cancelled = true; 2211 smp_wmb(); 2212 } else 2213 status = data->rpc_status; 2214 rpc_put_task(task); 2215 return status; 2216 } 2217 2218 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2219 { 2220 struct nfs4_opendata *data = calldata; 2221 struct nfs4_state_owner *sp = data->owner; 2222 struct nfs_client *clp = sp->so_server->nfs_client; 2223 enum open_claim_type4 claim = data->o_arg.claim; 2224 2225 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2226 goto out_wait; 2227 /* 2228 * Check if we still need to send an OPEN call, or if we can use 2229 * a delegation instead. 2230 */ 2231 if (data->state != NULL) { 2232 struct nfs_delegation *delegation; 2233 2234 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 2235 goto out_no_action; 2236 rcu_read_lock(); 2237 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 2238 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2239 goto unlock_no_action; 2240 rcu_read_unlock(); 2241 } 2242 /* Update client id. */ 2243 data->o_arg.clientid = clp->cl_clientid; 2244 switch (claim) { 2245 default: 2246 break; 2247 case NFS4_OPEN_CLAIM_PREVIOUS: 2248 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2249 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2250 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2251 case NFS4_OPEN_CLAIM_FH: 2252 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2253 } 2254 data->timestamp = jiffies; 2255 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2256 &data->o_arg.seq_args, 2257 &data->o_res.seq_res, 2258 task) != 0) 2259 nfs_release_seqid(data->o_arg.seqid); 2260 2261 /* Set the create mode (note dependency on the session type) */ 2262 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2263 if (data->o_arg.open_flags & O_EXCL) { 2264 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2265 if (nfs4_has_persistent_session(clp)) 2266 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2267 else if (clp->cl_mvops->minor_version > 0) 2268 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2269 } 2270 return; 2271 unlock_no_action: 2272 trace_nfs4_cached_open(data->state); 2273 rcu_read_unlock(); 2274 out_no_action: 2275 task->tk_action = NULL; 2276 out_wait: 2277 nfs4_sequence_done(task, &data->o_res.seq_res); 2278 } 2279 2280 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2281 { 2282 struct nfs4_opendata *data = calldata; 2283 2284 data->rpc_status = task->tk_status; 2285 2286 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2287 return; 2288 2289 if (task->tk_status == 0) { 2290 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2291 switch (data->o_res.f_attr->mode & S_IFMT) { 2292 case S_IFREG: 2293 break; 2294 case S_IFLNK: 2295 data->rpc_status = -ELOOP; 2296 break; 2297 case S_IFDIR: 2298 data->rpc_status = -EISDIR; 2299 break; 2300 default: 2301 data->rpc_status = -ENOTDIR; 2302 } 2303 } 2304 renew_lease(data->o_res.server, data->timestamp); 2305 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2306 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2307 } 2308 data->rpc_done = true; 2309 } 2310 2311 static void nfs4_open_release(void *calldata) 2312 { 2313 struct nfs4_opendata *data = calldata; 2314 struct nfs4_state *state = NULL; 2315 2316 /* If this request hasn't been cancelled, do nothing */ 2317 if (!data->cancelled) 2318 goto out_free; 2319 /* In case of error, no cleanup! */ 2320 if (data->rpc_status != 0 || !data->rpc_done) 2321 goto out_free; 2322 /* In case we need an open_confirm, no cleanup! */ 2323 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2324 goto out_free; 2325 state = nfs4_opendata_to_nfs4_state(data); 2326 if (!IS_ERR(state)) 2327 nfs4_close_state(state, data->o_arg.fmode); 2328 out_free: 2329 nfs4_opendata_put(data); 2330 } 2331 2332 static const struct rpc_call_ops nfs4_open_ops = { 2333 .rpc_call_prepare = nfs4_open_prepare, 2334 .rpc_call_done = nfs4_open_done, 2335 .rpc_release = nfs4_open_release, 2336 }; 2337 2338 static int nfs4_run_open_task(struct nfs4_opendata *data, 2339 struct nfs_open_context *ctx) 2340 { 2341 struct inode *dir = d_inode(data->dir); 2342 struct nfs_server *server = NFS_SERVER(dir); 2343 struct nfs_openargs *o_arg = &data->o_arg; 2344 struct nfs_openres *o_res = &data->o_res; 2345 struct rpc_task *task; 2346 struct rpc_message msg = { 2347 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2348 .rpc_argp = o_arg, 2349 .rpc_resp = o_res, 2350 .rpc_cred = data->owner->so_cred, 2351 }; 2352 struct rpc_task_setup task_setup_data = { 2353 .rpc_client = server->client, 2354 .rpc_message = &msg, 2355 .callback_ops = &nfs4_open_ops, 2356 .callback_data = data, 2357 .workqueue = nfsiod_workqueue, 2358 .flags = RPC_TASK_ASYNC, 2359 }; 2360 int status; 2361 2362 kref_get(&data->kref); 2363 data->rpc_done = false; 2364 data->rpc_status = 0; 2365 data->cancelled = false; 2366 data->is_recover = false; 2367 if (!ctx) { 2368 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2369 data->is_recover = true; 2370 } else { 2371 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2372 pnfs_lgopen_prepare(data, ctx); 2373 } 2374 task = rpc_run_task(&task_setup_data); 2375 if (IS_ERR(task)) 2376 return PTR_ERR(task); 2377 status = rpc_wait_for_completion_task(task); 2378 if (status != 0) { 2379 data->cancelled = true; 2380 smp_wmb(); 2381 } else 2382 status = data->rpc_status; 2383 rpc_put_task(task); 2384 2385 return status; 2386 } 2387 2388 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2389 { 2390 struct inode *dir = d_inode(data->dir); 2391 struct nfs_openres *o_res = &data->o_res; 2392 int status; 2393 2394 status = nfs4_run_open_task(data, NULL); 2395 if (status != 0 || !data->rpc_done) 2396 return status; 2397 2398 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2399 2400 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2401 status = _nfs4_proc_open_confirm(data); 2402 2403 return status; 2404 } 2405 2406 /* 2407 * Additional permission checks in order to distinguish between an 2408 * open for read, and an open for execute. This works around the 2409 * fact that NFSv4 OPEN treats read and execute permissions as being 2410 * the same. 2411 * Note that in the non-execute case, we want to turn off permission 2412 * checking if we just created a new file (POSIX open() semantics). 2413 */ 2414 static int nfs4_opendata_access(struct rpc_cred *cred, 2415 struct nfs4_opendata *opendata, 2416 struct nfs4_state *state, fmode_t fmode, 2417 int openflags) 2418 { 2419 struct nfs_access_entry cache; 2420 u32 mask, flags; 2421 2422 /* access call failed or for some reason the server doesn't 2423 * support any access modes -- defer access call until later */ 2424 if (opendata->o_res.access_supported == 0) 2425 return 0; 2426 2427 mask = 0; 2428 /* 2429 * Use openflags to check for exec, because fmode won't 2430 * always have FMODE_EXEC set when file open for exec. 2431 */ 2432 if (openflags & __FMODE_EXEC) { 2433 /* ONLY check for exec rights */ 2434 if (S_ISDIR(state->inode->i_mode)) 2435 mask = NFS4_ACCESS_LOOKUP; 2436 else 2437 mask = NFS4_ACCESS_EXECUTE; 2438 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2439 mask = NFS4_ACCESS_READ; 2440 2441 cache.cred = cred; 2442 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2443 nfs_access_add_cache(state->inode, &cache); 2444 2445 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2446 if ((mask & ~cache.mask & flags) == 0) 2447 return 0; 2448 2449 return -EACCES; 2450 } 2451 2452 /* 2453 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2454 */ 2455 static int _nfs4_proc_open(struct nfs4_opendata *data, 2456 struct nfs_open_context *ctx) 2457 { 2458 struct inode *dir = d_inode(data->dir); 2459 struct nfs_server *server = NFS_SERVER(dir); 2460 struct nfs_openargs *o_arg = &data->o_arg; 2461 struct nfs_openres *o_res = &data->o_res; 2462 int status; 2463 2464 status = nfs4_run_open_task(data, ctx); 2465 if (!data->rpc_done) 2466 return status; 2467 if (status != 0) { 2468 if (status == -NFS4ERR_BADNAME && 2469 !(o_arg->open_flags & O_CREAT)) 2470 return -ENOENT; 2471 return status; 2472 } 2473 2474 nfs_fattr_map_and_free_names(server, &data->f_attr); 2475 2476 if (o_arg->open_flags & O_CREAT) { 2477 if (o_arg->open_flags & O_EXCL) 2478 data->file_created = true; 2479 else if (o_res->cinfo.before != o_res->cinfo.after) 2480 data->file_created = true; 2481 if (data->file_created || 2482 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2483 update_changeattr(dir, &o_res->cinfo, 2484 o_res->f_attr->time_start); 2485 } 2486 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2487 server->caps &= ~NFS_CAP_POSIX_LOCK; 2488 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2489 status = _nfs4_proc_open_confirm(data); 2490 if (status != 0) 2491 return status; 2492 } 2493 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2494 nfs4_sequence_free_slot(&o_res->seq_res); 2495 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, 2496 o_res->f_label, NULL); 2497 } 2498 return 0; 2499 } 2500 2501 /* 2502 * OPEN_EXPIRED: 2503 * reclaim state on the server after a network partition. 2504 * Assumes caller holds the appropriate lock 2505 */ 2506 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2507 { 2508 struct nfs4_opendata *opendata; 2509 int ret; 2510 2511 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2512 NFS4_OPEN_CLAIM_FH); 2513 if (IS_ERR(opendata)) 2514 return PTR_ERR(opendata); 2515 ret = nfs4_open_recover(opendata, state); 2516 if (ret == -ESTALE) 2517 d_drop(ctx->dentry); 2518 nfs4_opendata_put(opendata); 2519 return ret; 2520 } 2521 2522 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2523 { 2524 struct nfs_server *server = NFS_SERVER(state->inode); 2525 struct nfs4_exception exception = { }; 2526 int err; 2527 2528 do { 2529 err = _nfs4_open_expired(ctx, state); 2530 trace_nfs4_open_expired(ctx, 0, err); 2531 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2532 continue; 2533 switch (err) { 2534 default: 2535 goto out; 2536 case -NFS4ERR_GRACE: 2537 case -NFS4ERR_DELAY: 2538 nfs4_handle_exception(server, err, &exception); 2539 err = 0; 2540 } 2541 } while (exception.retry); 2542 out: 2543 return err; 2544 } 2545 2546 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2547 { 2548 struct nfs_open_context *ctx; 2549 int ret; 2550 2551 ctx = nfs4_state_find_open_context(state); 2552 if (IS_ERR(ctx)) 2553 return -EAGAIN; 2554 ret = nfs4_do_open_expired(ctx, state); 2555 put_nfs_open_context(ctx); 2556 return ret; 2557 } 2558 2559 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2560 const nfs4_stateid *stateid) 2561 { 2562 nfs_remove_bad_delegation(state->inode, stateid); 2563 write_seqlock(&state->seqlock); 2564 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2565 write_sequnlock(&state->seqlock); 2566 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2567 } 2568 2569 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2570 { 2571 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2572 nfs_finish_clear_delegation_stateid(state, NULL); 2573 } 2574 2575 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2576 { 2577 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2578 nfs40_clear_delegation_stateid(state); 2579 return nfs4_open_expired(sp, state); 2580 } 2581 2582 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2583 nfs4_stateid *stateid, 2584 struct rpc_cred *cred) 2585 { 2586 return -NFS4ERR_BAD_STATEID; 2587 } 2588 2589 #if defined(CONFIG_NFS_V4_1) 2590 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2591 nfs4_stateid *stateid, 2592 struct rpc_cred *cred) 2593 { 2594 int status; 2595 2596 switch (stateid->type) { 2597 default: 2598 break; 2599 case NFS4_INVALID_STATEID_TYPE: 2600 case NFS4_SPECIAL_STATEID_TYPE: 2601 return -NFS4ERR_BAD_STATEID; 2602 case NFS4_REVOKED_STATEID_TYPE: 2603 goto out_free; 2604 } 2605 2606 status = nfs41_test_stateid(server, stateid, cred); 2607 switch (status) { 2608 case -NFS4ERR_EXPIRED: 2609 case -NFS4ERR_ADMIN_REVOKED: 2610 case -NFS4ERR_DELEG_REVOKED: 2611 break; 2612 default: 2613 return status; 2614 } 2615 out_free: 2616 /* Ack the revoked state to the server */ 2617 nfs41_free_stateid(server, stateid, cred, true); 2618 return -NFS4ERR_EXPIRED; 2619 } 2620 2621 static void nfs41_check_delegation_stateid(struct nfs4_state *state) 2622 { 2623 struct nfs_server *server = NFS_SERVER(state->inode); 2624 nfs4_stateid stateid; 2625 struct nfs_delegation *delegation; 2626 struct rpc_cred *cred; 2627 int status; 2628 2629 /* Get the delegation credential for use by test/free_stateid */ 2630 rcu_read_lock(); 2631 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2632 if (delegation == NULL) { 2633 rcu_read_unlock(); 2634 return; 2635 } 2636 2637 nfs4_stateid_copy(&stateid, &delegation->stateid); 2638 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) || 2639 !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2640 &delegation->flags)) { 2641 rcu_read_unlock(); 2642 nfs_finish_clear_delegation_stateid(state, &stateid); 2643 return; 2644 } 2645 2646 cred = get_rpccred(delegation->cred); 2647 rcu_read_unlock(); 2648 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2649 trace_nfs4_test_delegation_stateid(state, NULL, status); 2650 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2651 nfs_finish_clear_delegation_stateid(state, &stateid); 2652 2653 put_rpccred(cred); 2654 } 2655 2656 /** 2657 * nfs41_check_expired_locks - possibly free a lock stateid 2658 * 2659 * @state: NFSv4 state for an inode 2660 * 2661 * Returns NFS_OK if recovery for this stateid is now finished. 2662 * Otherwise a negative NFS4ERR value is returned. 2663 */ 2664 static int nfs41_check_expired_locks(struct nfs4_state *state) 2665 { 2666 int status, ret = NFS_OK; 2667 struct nfs4_lock_state *lsp, *prev = NULL; 2668 struct nfs_server *server = NFS_SERVER(state->inode); 2669 2670 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2671 goto out; 2672 2673 spin_lock(&state->state_lock); 2674 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2675 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2676 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 2677 2678 refcount_inc(&lsp->ls_count); 2679 spin_unlock(&state->state_lock); 2680 2681 nfs4_put_lock_state(prev); 2682 prev = lsp; 2683 2684 status = nfs41_test_and_free_expired_stateid(server, 2685 &lsp->ls_stateid, 2686 cred); 2687 trace_nfs4_test_lock_stateid(state, lsp, status); 2688 if (status == -NFS4ERR_EXPIRED || 2689 status == -NFS4ERR_BAD_STATEID) { 2690 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2691 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2692 if (!recover_lost_locks) 2693 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2694 } else if (status != NFS_OK) { 2695 ret = status; 2696 nfs4_put_lock_state(prev); 2697 goto out; 2698 } 2699 spin_lock(&state->state_lock); 2700 } 2701 } 2702 spin_unlock(&state->state_lock); 2703 nfs4_put_lock_state(prev); 2704 out: 2705 return ret; 2706 } 2707 2708 /** 2709 * nfs41_check_open_stateid - possibly free an open stateid 2710 * 2711 * @state: NFSv4 state for an inode 2712 * 2713 * Returns NFS_OK if recovery for this stateid is now finished. 2714 * Otherwise a negative NFS4ERR value is returned. 2715 */ 2716 static int nfs41_check_open_stateid(struct nfs4_state *state) 2717 { 2718 struct nfs_server *server = NFS_SERVER(state->inode); 2719 nfs4_stateid *stateid = &state->open_stateid; 2720 struct rpc_cred *cred = state->owner->so_cred; 2721 int status; 2722 2723 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) { 2724 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) { 2725 if (nfs4_have_delegation(state->inode, state->state)) 2726 return NFS_OK; 2727 return -NFS4ERR_OPENMODE; 2728 } 2729 return -NFS4ERR_BAD_STATEID; 2730 } 2731 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2732 trace_nfs4_test_open_stateid(state, NULL, status); 2733 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2734 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2735 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2736 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2737 clear_bit(NFS_OPEN_STATE, &state->flags); 2738 stateid->type = NFS4_INVALID_STATEID_TYPE; 2739 return status; 2740 } 2741 if (nfs_open_stateid_recover_openmode(state)) 2742 return -NFS4ERR_OPENMODE; 2743 return NFS_OK; 2744 } 2745 2746 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2747 { 2748 int status; 2749 2750 nfs41_check_delegation_stateid(state); 2751 status = nfs41_check_expired_locks(state); 2752 if (status != NFS_OK) 2753 return status; 2754 status = nfs41_check_open_stateid(state); 2755 if (status != NFS_OK) 2756 status = nfs4_open_expired(sp, state); 2757 return status; 2758 } 2759 #endif 2760 2761 /* 2762 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2763 * fields corresponding to attributes that were used to store the verifier. 2764 * Make sure we clobber those fields in the later setattr call 2765 */ 2766 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2767 struct iattr *sattr, struct nfs4_label **label) 2768 { 2769 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2770 __u32 attrset[3]; 2771 unsigned ret; 2772 unsigned i; 2773 2774 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 2775 attrset[i] = opendata->o_res.attrset[i]; 2776 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 2777 attrset[i] &= ~bitmask[i]; 2778 } 2779 2780 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 2781 sattr->ia_valid : 0; 2782 2783 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 2784 if (sattr->ia_valid & ATTR_ATIME_SET) 2785 ret |= ATTR_ATIME_SET; 2786 else 2787 ret |= ATTR_ATIME; 2788 } 2789 2790 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 2791 if (sattr->ia_valid & ATTR_MTIME_SET) 2792 ret |= ATTR_MTIME_SET; 2793 else 2794 ret |= ATTR_MTIME; 2795 } 2796 2797 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 2798 *label = NULL; 2799 return ret; 2800 } 2801 2802 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2803 fmode_t fmode, 2804 int flags, 2805 struct nfs_open_context *ctx) 2806 { 2807 struct nfs4_state_owner *sp = opendata->owner; 2808 struct nfs_server *server = sp->so_server; 2809 struct dentry *dentry; 2810 struct nfs4_state *state; 2811 unsigned int seq; 2812 int ret; 2813 2814 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2815 2816 ret = _nfs4_proc_open(opendata, ctx); 2817 if (ret != 0) 2818 goto out; 2819 2820 state = _nfs4_opendata_to_nfs4_state(opendata); 2821 ret = PTR_ERR(state); 2822 if (IS_ERR(state)) 2823 goto out; 2824 ctx->state = state; 2825 if (server->caps & NFS_CAP_POSIX_LOCK) 2826 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2827 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 2828 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 2829 2830 dentry = opendata->dentry; 2831 if (d_really_is_negative(dentry)) { 2832 struct dentry *alias; 2833 d_drop(dentry); 2834 alias = d_exact_alias(dentry, state->inode); 2835 if (!alias) 2836 alias = d_splice_alias(igrab(state->inode), dentry); 2837 /* d_splice_alias() can't fail here - it's a non-directory */ 2838 if (alias) { 2839 dput(ctx->dentry); 2840 ctx->dentry = dentry = alias; 2841 } 2842 nfs_set_verifier(dentry, 2843 nfs_save_change_attribute(d_inode(opendata->dir))); 2844 } 2845 2846 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2847 if (ret != 0) 2848 goto out; 2849 2850 if (d_inode(dentry) == state->inode) { 2851 nfs_inode_attach_open_context(ctx); 2852 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2853 nfs4_schedule_stateid_recovery(server, state); 2854 else 2855 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 2856 } 2857 2858 out: 2859 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 2860 return ret; 2861 } 2862 2863 /* 2864 * Returns a referenced nfs4_state 2865 */ 2866 static int _nfs4_do_open(struct inode *dir, 2867 struct nfs_open_context *ctx, 2868 int flags, 2869 const struct nfs4_open_createattrs *c, 2870 int *opened) 2871 { 2872 struct nfs4_state_owner *sp; 2873 struct nfs4_state *state = NULL; 2874 struct nfs_server *server = NFS_SERVER(dir); 2875 struct nfs4_opendata *opendata; 2876 struct dentry *dentry = ctx->dentry; 2877 struct rpc_cred *cred = ctx->cred; 2878 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2879 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2880 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2881 struct iattr *sattr = c->sattr; 2882 struct nfs4_label *label = c->label; 2883 struct nfs4_label *olabel = NULL; 2884 int status; 2885 2886 /* Protect against reboot recovery conflicts */ 2887 status = -ENOMEM; 2888 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2889 if (sp == NULL) { 2890 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2891 goto out_err; 2892 } 2893 status = nfs4_client_recover_expired_lease(server->nfs_client); 2894 if (status != 0) 2895 goto err_put_state_owner; 2896 if (d_really_is_positive(dentry)) 2897 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 2898 status = -ENOMEM; 2899 if (d_really_is_positive(dentry)) 2900 claim = NFS4_OPEN_CLAIM_FH; 2901 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 2902 c, claim, GFP_KERNEL); 2903 if (opendata == NULL) 2904 goto err_put_state_owner; 2905 2906 if (label) { 2907 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2908 if (IS_ERR(olabel)) { 2909 status = PTR_ERR(olabel); 2910 goto err_opendata_put; 2911 } 2912 } 2913 2914 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2915 if (!opendata->f_attr.mdsthreshold) { 2916 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2917 if (!opendata->f_attr.mdsthreshold) 2918 goto err_free_label; 2919 } 2920 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2921 } 2922 if (d_really_is_positive(dentry)) 2923 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 2924 2925 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2926 if (status != 0) 2927 goto err_free_label; 2928 state = ctx->state; 2929 2930 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 2931 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2932 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 2933 /* 2934 * send create attributes which was not set by open 2935 * with an extra setattr. 2936 */ 2937 if (attrs || label) { 2938 unsigned ia_old = sattr->ia_valid; 2939 2940 sattr->ia_valid = attrs; 2941 nfs_fattr_init(opendata->o_res.f_attr); 2942 status = nfs4_do_setattr(state->inode, cred, 2943 opendata->o_res.f_attr, sattr, 2944 ctx, label, olabel); 2945 if (status == 0) { 2946 nfs_setattr_update_inode(state->inode, sattr, 2947 opendata->o_res.f_attr); 2948 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2949 } 2950 sattr->ia_valid = ia_old; 2951 } 2952 } 2953 if (opened && opendata->file_created) 2954 *opened |= FILE_CREATED; 2955 2956 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2957 *ctx_th = opendata->f_attr.mdsthreshold; 2958 opendata->f_attr.mdsthreshold = NULL; 2959 } 2960 2961 nfs4_label_free(olabel); 2962 2963 nfs4_opendata_put(opendata); 2964 nfs4_put_state_owner(sp); 2965 return 0; 2966 err_free_label: 2967 nfs4_label_free(olabel); 2968 err_opendata_put: 2969 nfs4_opendata_put(opendata); 2970 err_put_state_owner: 2971 nfs4_put_state_owner(sp); 2972 out_err: 2973 return status; 2974 } 2975 2976 2977 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2978 struct nfs_open_context *ctx, 2979 int flags, 2980 struct iattr *sattr, 2981 struct nfs4_label *label, 2982 int *opened) 2983 { 2984 struct nfs_server *server = NFS_SERVER(dir); 2985 struct nfs4_exception exception = { }; 2986 struct nfs4_state *res; 2987 struct nfs4_open_createattrs c = { 2988 .label = label, 2989 .sattr = sattr, 2990 .verf = { 2991 [0] = (__u32)jiffies, 2992 [1] = (__u32)current->pid, 2993 }, 2994 }; 2995 int status; 2996 2997 do { 2998 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 2999 res = ctx->state; 3000 trace_nfs4_open_file(ctx, flags, status); 3001 if (status == 0) 3002 break; 3003 /* NOTE: BAD_SEQID means the server and client disagree about the 3004 * book-keeping w.r.t. state-changing operations 3005 * (OPEN/CLOSE/LOCK/LOCKU...) 3006 * It is actually a sign of a bug on the client or on the server. 3007 * 3008 * If we receive a BAD_SEQID error in the particular case of 3009 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3010 * have unhashed the old state_owner for us, and that we can 3011 * therefore safely retry using a new one. We should still warn 3012 * the user though... 3013 */ 3014 if (status == -NFS4ERR_BAD_SEQID) { 3015 pr_warn_ratelimited("NFS: v4 server %s " 3016 " returned a bad sequence-id error!\n", 3017 NFS_SERVER(dir)->nfs_client->cl_hostname); 3018 exception.retry = 1; 3019 continue; 3020 } 3021 /* 3022 * BAD_STATEID on OPEN means that the server cancelled our 3023 * state before it received the OPEN_CONFIRM. 3024 * Recover by retrying the request as per the discussion 3025 * on Page 181 of RFC3530. 3026 */ 3027 if (status == -NFS4ERR_BAD_STATEID) { 3028 exception.retry = 1; 3029 continue; 3030 } 3031 if (status == -EAGAIN) { 3032 /* We must have found a delegation */ 3033 exception.retry = 1; 3034 continue; 3035 } 3036 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3037 continue; 3038 res = ERR_PTR(nfs4_handle_exception(server, 3039 status, &exception)); 3040 } while (exception.retry); 3041 return res; 3042 } 3043 3044 static int _nfs4_do_setattr(struct inode *inode, 3045 struct nfs_setattrargs *arg, 3046 struct nfs_setattrres *res, 3047 struct rpc_cred *cred, 3048 struct nfs_open_context *ctx) 3049 { 3050 struct nfs_server *server = NFS_SERVER(inode); 3051 struct rpc_message msg = { 3052 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3053 .rpc_argp = arg, 3054 .rpc_resp = res, 3055 .rpc_cred = cred, 3056 }; 3057 struct rpc_cred *delegation_cred = NULL; 3058 unsigned long timestamp = jiffies; 3059 bool truncate; 3060 int status; 3061 3062 nfs_fattr_init(res->fattr); 3063 3064 /* Servers should only apply open mode checks for file size changes */ 3065 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3066 if (!truncate) 3067 goto zero_stateid; 3068 3069 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3070 /* Use that stateid */ 3071 } else if (ctx != NULL) { 3072 struct nfs_lock_context *l_ctx; 3073 if (!nfs4_valid_open_stateid(ctx->state)) 3074 return -EBADF; 3075 l_ctx = nfs_get_lock_context(ctx); 3076 if (IS_ERR(l_ctx)) 3077 return PTR_ERR(l_ctx); 3078 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3079 &arg->stateid, &delegation_cred); 3080 nfs_put_lock_context(l_ctx); 3081 if (status == -EIO) 3082 return -EBADF; 3083 } else { 3084 zero_stateid: 3085 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3086 } 3087 if (delegation_cred) 3088 msg.rpc_cred = delegation_cred; 3089 3090 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3091 3092 put_rpccred(delegation_cred); 3093 if (status == 0 && ctx != NULL) 3094 renew_lease(server, timestamp); 3095 trace_nfs4_setattr(inode, &arg->stateid, status); 3096 return status; 3097 } 3098 3099 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 3100 struct nfs_fattr *fattr, struct iattr *sattr, 3101 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 3102 struct nfs4_label *olabel) 3103 { 3104 struct nfs_server *server = NFS_SERVER(inode); 3105 __u32 bitmask[NFS4_BITMASK_SZ]; 3106 struct nfs4_state *state = ctx ? ctx->state : NULL; 3107 struct nfs_setattrargs arg = { 3108 .fh = NFS_FH(inode), 3109 .iap = sattr, 3110 .server = server, 3111 .bitmask = bitmask, 3112 .label = ilabel, 3113 }; 3114 struct nfs_setattrres res = { 3115 .fattr = fattr, 3116 .label = olabel, 3117 .server = server, 3118 }; 3119 struct nfs4_exception exception = { 3120 .state = state, 3121 .inode = inode, 3122 .stateid = &arg.stateid, 3123 }; 3124 int err; 3125 3126 do { 3127 nfs4_bitmap_copy_adjust_setattr(bitmask, 3128 nfs4_bitmask(server, olabel), 3129 inode); 3130 3131 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3132 switch (err) { 3133 case -NFS4ERR_OPENMODE: 3134 if (!(sattr->ia_valid & ATTR_SIZE)) { 3135 pr_warn_once("NFSv4: server %s is incorrectly " 3136 "applying open mode checks to " 3137 "a SETATTR that is not " 3138 "changing file size.\n", 3139 server->nfs_client->cl_hostname); 3140 } 3141 if (state && !(state->state & FMODE_WRITE)) { 3142 err = -EBADF; 3143 if (sattr->ia_valid & ATTR_OPEN) 3144 err = -EACCES; 3145 goto out; 3146 } 3147 } 3148 err = nfs4_handle_exception(server, err, &exception); 3149 } while (exception.retry); 3150 out: 3151 return err; 3152 } 3153 3154 static bool 3155 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3156 { 3157 if (inode == NULL || !nfs_have_layout(inode)) 3158 return false; 3159 3160 return pnfs_wait_on_layoutreturn(inode, task); 3161 } 3162 3163 struct nfs4_closedata { 3164 struct inode *inode; 3165 struct nfs4_state *state; 3166 struct nfs_closeargs arg; 3167 struct nfs_closeres res; 3168 struct { 3169 struct nfs4_layoutreturn_args arg; 3170 struct nfs4_layoutreturn_res res; 3171 struct nfs4_xdr_opaque_data ld_private; 3172 u32 roc_barrier; 3173 bool roc; 3174 } lr; 3175 struct nfs_fattr fattr; 3176 unsigned long timestamp; 3177 }; 3178 3179 static void nfs4_free_closedata(void *data) 3180 { 3181 struct nfs4_closedata *calldata = data; 3182 struct nfs4_state_owner *sp = calldata->state->owner; 3183 struct super_block *sb = calldata->state->inode->i_sb; 3184 3185 if (calldata->lr.roc) 3186 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3187 calldata->res.lr_ret); 3188 nfs4_put_open_state(calldata->state); 3189 nfs_free_seqid(calldata->arg.seqid); 3190 nfs4_put_state_owner(sp); 3191 nfs_sb_deactive(sb); 3192 kfree(calldata); 3193 } 3194 3195 static void nfs4_close_done(struct rpc_task *task, void *data) 3196 { 3197 struct nfs4_closedata *calldata = data; 3198 struct nfs4_state *state = calldata->state; 3199 struct nfs_server *server = NFS_SERVER(calldata->inode); 3200 nfs4_stateid *res_stateid = NULL; 3201 struct nfs4_exception exception = { 3202 .state = state, 3203 .inode = calldata->inode, 3204 .stateid = &calldata->arg.stateid, 3205 }; 3206 3207 dprintk("%s: begin!\n", __func__); 3208 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3209 return; 3210 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3211 3212 /* Handle Layoutreturn errors */ 3213 if (calldata->arg.lr_args && task->tk_status != 0) { 3214 switch (calldata->res.lr_ret) { 3215 default: 3216 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3217 break; 3218 case 0: 3219 calldata->arg.lr_args = NULL; 3220 calldata->res.lr_res = NULL; 3221 break; 3222 case -NFS4ERR_OLD_STATEID: 3223 if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid, 3224 calldata->inode)) 3225 goto lr_restart; 3226 /* Fallthrough */ 3227 case -NFS4ERR_ADMIN_REVOKED: 3228 case -NFS4ERR_DELEG_REVOKED: 3229 case -NFS4ERR_EXPIRED: 3230 case -NFS4ERR_BAD_STATEID: 3231 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 3232 case -NFS4ERR_WRONG_CRED: 3233 calldata->arg.lr_args = NULL; 3234 calldata->res.lr_res = NULL; 3235 goto lr_restart; 3236 } 3237 } 3238 3239 /* hmm. we are done with the inode, and in the process of freeing 3240 * the state_owner. we keep this around to process errors 3241 */ 3242 switch (task->tk_status) { 3243 case 0: 3244 res_stateid = &calldata->res.stateid; 3245 renew_lease(server, calldata->timestamp); 3246 break; 3247 case -NFS4ERR_ACCESS: 3248 if (calldata->arg.bitmask != NULL) { 3249 calldata->arg.bitmask = NULL; 3250 calldata->res.fattr = NULL; 3251 goto out_restart; 3252 3253 } 3254 break; 3255 case -NFS4ERR_OLD_STATEID: 3256 /* Did we race with OPEN? */ 3257 if (nfs4_refresh_open_stateid(&calldata->arg.stateid, 3258 state)) 3259 goto out_restart; 3260 goto out_release; 3261 case -NFS4ERR_ADMIN_REVOKED: 3262 case -NFS4ERR_STALE_STATEID: 3263 case -NFS4ERR_EXPIRED: 3264 nfs4_free_revoked_stateid(server, 3265 &calldata->arg.stateid, 3266 task->tk_msg.rpc_cred); 3267 /* Fallthrough */ 3268 case -NFS4ERR_BAD_STATEID: 3269 break; 3270 default: 3271 task->tk_status = nfs4_async_handle_exception(task, 3272 server, task->tk_status, &exception); 3273 if (exception.retry) 3274 goto out_restart; 3275 } 3276 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3277 res_stateid, calldata->arg.fmode); 3278 out_release: 3279 task->tk_status = 0; 3280 nfs_release_seqid(calldata->arg.seqid); 3281 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3282 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 3283 return; 3284 lr_restart: 3285 calldata->res.lr_ret = 0; 3286 out_restart: 3287 task->tk_status = 0; 3288 rpc_restart_call_prepare(task); 3289 goto out_release; 3290 } 3291 3292 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3293 { 3294 struct nfs4_closedata *calldata = data; 3295 struct nfs4_state *state = calldata->state; 3296 struct inode *inode = calldata->inode; 3297 struct pnfs_layout_hdr *lo; 3298 bool is_rdonly, is_wronly, is_rdwr; 3299 int call_close = 0; 3300 3301 dprintk("%s: begin!\n", __func__); 3302 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3303 goto out_wait; 3304 3305 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3306 spin_lock(&state->owner->so_lock); 3307 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3308 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3309 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3310 /* Calculate the change in open mode */ 3311 calldata->arg.fmode = 0; 3312 if (state->n_rdwr == 0) { 3313 if (state->n_rdonly == 0) 3314 call_close |= is_rdonly; 3315 else if (is_rdonly) 3316 calldata->arg.fmode |= FMODE_READ; 3317 if (state->n_wronly == 0) 3318 call_close |= is_wronly; 3319 else if (is_wronly) 3320 calldata->arg.fmode |= FMODE_WRITE; 3321 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3322 call_close |= is_rdwr; 3323 } else if (is_rdwr) 3324 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3325 3326 if (!nfs4_valid_open_stateid(state) || 3327 !nfs4_refresh_open_stateid(&calldata->arg.stateid, state)) 3328 call_close = 0; 3329 spin_unlock(&state->owner->so_lock); 3330 3331 if (!call_close) { 3332 /* Note: exit _without_ calling nfs4_close_done */ 3333 goto out_no_action; 3334 } 3335 3336 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3337 nfs_release_seqid(calldata->arg.seqid); 3338 goto out_wait; 3339 } 3340 3341 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3342 if (lo && !pnfs_layout_is_valid(lo)) { 3343 calldata->arg.lr_args = NULL; 3344 calldata->res.lr_res = NULL; 3345 } 3346 3347 if (calldata->arg.fmode == 0) 3348 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3349 3350 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3351 /* Close-to-open cache consistency revalidation */ 3352 if (!nfs4_have_delegation(inode, FMODE_READ)) 3353 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3354 else 3355 calldata->arg.bitmask = NULL; 3356 } 3357 3358 calldata->arg.share_access = 3359 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3360 calldata->arg.fmode, 0); 3361 3362 if (calldata->res.fattr == NULL) 3363 calldata->arg.bitmask = NULL; 3364 else if (calldata->arg.bitmask == NULL) 3365 calldata->res.fattr = NULL; 3366 calldata->timestamp = jiffies; 3367 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3368 &calldata->arg.seq_args, 3369 &calldata->res.seq_res, 3370 task) != 0) 3371 nfs_release_seqid(calldata->arg.seqid); 3372 dprintk("%s: done!\n", __func__); 3373 return; 3374 out_no_action: 3375 task->tk_action = NULL; 3376 out_wait: 3377 nfs4_sequence_done(task, &calldata->res.seq_res); 3378 } 3379 3380 static const struct rpc_call_ops nfs4_close_ops = { 3381 .rpc_call_prepare = nfs4_close_prepare, 3382 .rpc_call_done = nfs4_close_done, 3383 .rpc_release = nfs4_free_closedata, 3384 }; 3385 3386 /* 3387 * It is possible for data to be read/written from a mem-mapped file 3388 * after the sys_close call (which hits the vfs layer as a flush). 3389 * This means that we can't safely call nfsv4 close on a file until 3390 * the inode is cleared. This in turn means that we are not good 3391 * NFSv4 citizens - we do not indicate to the server to update the file's 3392 * share state even when we are done with one of the three share 3393 * stateid's in the inode. 3394 * 3395 * NOTE: Caller must be holding the sp->so_owner semaphore! 3396 */ 3397 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3398 { 3399 struct nfs_server *server = NFS_SERVER(state->inode); 3400 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3401 struct nfs4_closedata *calldata; 3402 struct nfs4_state_owner *sp = state->owner; 3403 struct rpc_task *task; 3404 struct rpc_message msg = { 3405 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3406 .rpc_cred = state->owner->so_cred, 3407 }; 3408 struct rpc_task_setup task_setup_data = { 3409 .rpc_client = server->client, 3410 .rpc_message = &msg, 3411 .callback_ops = &nfs4_close_ops, 3412 .workqueue = nfsiod_workqueue, 3413 .flags = RPC_TASK_ASYNC, 3414 }; 3415 int status = -ENOMEM; 3416 3417 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3418 &task_setup_data.rpc_client, &msg); 3419 3420 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3421 if (calldata == NULL) 3422 goto out; 3423 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3424 calldata->inode = state->inode; 3425 calldata->state = state; 3426 calldata->arg.fh = NFS_FH(state->inode); 3427 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3428 goto out_free_calldata; 3429 /* Serialization for the sequence id */ 3430 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3431 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3432 if (IS_ERR(calldata->arg.seqid)) 3433 goto out_free_calldata; 3434 nfs_fattr_init(&calldata->fattr); 3435 calldata->arg.fmode = 0; 3436 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3437 calldata->res.fattr = &calldata->fattr; 3438 calldata->res.seqid = calldata->arg.seqid; 3439 calldata->res.server = server; 3440 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3441 calldata->lr.roc = pnfs_roc(state->inode, 3442 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3443 if (calldata->lr.roc) { 3444 calldata->arg.lr_args = &calldata->lr.arg; 3445 calldata->res.lr_res = &calldata->lr.res; 3446 } 3447 nfs_sb_active(calldata->inode->i_sb); 3448 3449 msg.rpc_argp = &calldata->arg; 3450 msg.rpc_resp = &calldata->res; 3451 task_setup_data.callback_data = calldata; 3452 task = rpc_run_task(&task_setup_data); 3453 if (IS_ERR(task)) 3454 return PTR_ERR(task); 3455 status = 0; 3456 if (wait) 3457 status = rpc_wait_for_completion_task(task); 3458 rpc_put_task(task); 3459 return status; 3460 out_free_calldata: 3461 kfree(calldata); 3462 out: 3463 nfs4_put_open_state(state); 3464 nfs4_put_state_owner(sp); 3465 return status; 3466 } 3467 3468 static struct inode * 3469 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3470 int open_flags, struct iattr *attr, int *opened) 3471 { 3472 struct nfs4_state *state; 3473 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3474 3475 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3476 3477 /* Protect against concurrent sillydeletes */ 3478 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3479 3480 nfs4_label_release_security(label); 3481 3482 if (IS_ERR(state)) 3483 return ERR_CAST(state); 3484 return state->inode; 3485 } 3486 3487 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3488 { 3489 if (ctx->state == NULL) 3490 return; 3491 if (is_sync) 3492 nfs4_close_sync(ctx->state, ctx->mode); 3493 else 3494 nfs4_close_state(ctx->state, ctx->mode); 3495 } 3496 3497 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3498 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3499 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL) 3500 3501 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3502 { 3503 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3504 struct nfs4_server_caps_arg args = { 3505 .fhandle = fhandle, 3506 .bitmask = bitmask, 3507 }; 3508 struct nfs4_server_caps_res res = {}; 3509 struct rpc_message msg = { 3510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3511 .rpc_argp = &args, 3512 .rpc_resp = &res, 3513 }; 3514 int status; 3515 int i; 3516 3517 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3518 FATTR4_WORD0_FH_EXPIRE_TYPE | 3519 FATTR4_WORD0_LINK_SUPPORT | 3520 FATTR4_WORD0_SYMLINK_SUPPORT | 3521 FATTR4_WORD0_ACLSUPPORT; 3522 if (minorversion) 3523 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3524 3525 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3526 if (status == 0) { 3527 /* Sanity check the server answers */ 3528 switch (minorversion) { 3529 case 0: 3530 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3531 res.attr_bitmask[2] = 0; 3532 break; 3533 case 1: 3534 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3535 break; 3536 case 2: 3537 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3538 } 3539 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3540 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3541 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3542 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3543 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3544 NFS_CAP_CTIME|NFS_CAP_MTIME| 3545 NFS_CAP_SECURITY_LABEL); 3546 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3547 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3548 server->caps |= NFS_CAP_ACLS; 3549 if (res.has_links != 0) 3550 server->caps |= NFS_CAP_HARDLINKS; 3551 if (res.has_symlinks != 0) 3552 server->caps |= NFS_CAP_SYMLINKS; 3553 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3554 server->caps |= NFS_CAP_FILEID; 3555 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3556 server->caps |= NFS_CAP_MODE; 3557 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3558 server->caps |= NFS_CAP_NLINK; 3559 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3560 server->caps |= NFS_CAP_OWNER; 3561 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3562 server->caps |= NFS_CAP_OWNER_GROUP; 3563 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3564 server->caps |= NFS_CAP_ATIME; 3565 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3566 server->caps |= NFS_CAP_CTIME; 3567 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3568 server->caps |= NFS_CAP_MTIME; 3569 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3570 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3571 server->caps |= NFS_CAP_SECURITY_LABEL; 3572 #endif 3573 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3574 sizeof(server->attr_bitmask)); 3575 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3576 3577 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3578 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3579 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3580 server->cache_consistency_bitmask[2] = 0; 3581 3582 /* Avoid a regression due to buggy server */ 3583 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3584 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3585 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3586 sizeof(server->exclcreat_bitmask)); 3587 3588 server->acl_bitmask = res.acl_bitmask; 3589 server->fh_expire_type = res.fh_expire_type; 3590 } 3591 3592 return status; 3593 } 3594 3595 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3596 { 3597 struct nfs4_exception exception = { }; 3598 int err; 3599 do { 3600 err = nfs4_handle_exception(server, 3601 _nfs4_server_capabilities(server, fhandle), 3602 &exception); 3603 } while (exception.retry); 3604 return err; 3605 } 3606 3607 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3608 struct nfs_fsinfo *info) 3609 { 3610 u32 bitmask[3]; 3611 struct nfs4_lookup_root_arg args = { 3612 .bitmask = bitmask, 3613 }; 3614 struct nfs4_lookup_res res = { 3615 .server = server, 3616 .fattr = info->fattr, 3617 .fh = fhandle, 3618 }; 3619 struct rpc_message msg = { 3620 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3621 .rpc_argp = &args, 3622 .rpc_resp = &res, 3623 }; 3624 3625 bitmask[0] = nfs4_fattr_bitmap[0]; 3626 bitmask[1] = nfs4_fattr_bitmap[1]; 3627 /* 3628 * Process the label in the upcoming getfattr 3629 */ 3630 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3631 3632 nfs_fattr_init(info->fattr); 3633 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3634 } 3635 3636 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3637 struct nfs_fsinfo *info) 3638 { 3639 struct nfs4_exception exception = { }; 3640 int err; 3641 do { 3642 err = _nfs4_lookup_root(server, fhandle, info); 3643 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3644 switch (err) { 3645 case 0: 3646 case -NFS4ERR_WRONGSEC: 3647 goto out; 3648 default: 3649 err = nfs4_handle_exception(server, err, &exception); 3650 } 3651 } while (exception.retry); 3652 out: 3653 return err; 3654 } 3655 3656 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3657 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3658 { 3659 struct rpc_auth_create_args auth_args = { 3660 .pseudoflavor = flavor, 3661 }; 3662 struct rpc_auth *auth; 3663 3664 auth = rpcauth_create(&auth_args, server->client); 3665 if (IS_ERR(auth)) 3666 return -EACCES; 3667 return nfs4_lookup_root(server, fhandle, info); 3668 } 3669 3670 /* 3671 * Retry pseudoroot lookup with various security flavors. We do this when: 3672 * 3673 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3674 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3675 * 3676 * Returns zero on success, or a negative NFS4ERR value, or a 3677 * negative errno value. 3678 */ 3679 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3680 struct nfs_fsinfo *info) 3681 { 3682 /* Per 3530bis 15.33.5 */ 3683 static const rpc_authflavor_t flav_array[] = { 3684 RPC_AUTH_GSS_KRB5P, 3685 RPC_AUTH_GSS_KRB5I, 3686 RPC_AUTH_GSS_KRB5, 3687 RPC_AUTH_UNIX, /* courtesy */ 3688 RPC_AUTH_NULL, 3689 }; 3690 int status = -EPERM; 3691 size_t i; 3692 3693 if (server->auth_info.flavor_len > 0) { 3694 /* try each flavor specified by user */ 3695 for (i = 0; i < server->auth_info.flavor_len; i++) { 3696 status = nfs4_lookup_root_sec(server, fhandle, info, 3697 server->auth_info.flavors[i]); 3698 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3699 continue; 3700 break; 3701 } 3702 } else { 3703 /* no flavors specified by user, try default list */ 3704 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3705 status = nfs4_lookup_root_sec(server, fhandle, info, 3706 flav_array[i]); 3707 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3708 continue; 3709 break; 3710 } 3711 } 3712 3713 /* 3714 * -EACCESS could mean that the user doesn't have correct permissions 3715 * to access the mount. It could also mean that we tried to mount 3716 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3717 * existing mount programs don't handle -EACCES very well so it should 3718 * be mapped to -EPERM instead. 3719 */ 3720 if (status == -EACCES) 3721 status = -EPERM; 3722 return status; 3723 } 3724 3725 /** 3726 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3727 * @server: initialized nfs_server handle 3728 * @fhandle: we fill in the pseudo-fs root file handle 3729 * @info: we fill in an FSINFO struct 3730 * @auth_probe: probe the auth flavours 3731 * 3732 * Returns zero on success, or a negative errno. 3733 */ 3734 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3735 struct nfs_fsinfo *info, 3736 bool auth_probe) 3737 { 3738 int status = 0; 3739 3740 if (!auth_probe) 3741 status = nfs4_lookup_root(server, fhandle, info); 3742 3743 if (auth_probe || status == NFS4ERR_WRONGSEC) 3744 status = server->nfs_client->cl_mvops->find_root_sec(server, 3745 fhandle, info); 3746 3747 if (status == 0) 3748 status = nfs4_server_capabilities(server, fhandle); 3749 if (status == 0) 3750 status = nfs4_do_fsinfo(server, fhandle, info); 3751 3752 return nfs4_map_errors(status); 3753 } 3754 3755 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3756 struct nfs_fsinfo *info) 3757 { 3758 int error; 3759 struct nfs_fattr *fattr = info->fattr; 3760 struct nfs4_label *label = NULL; 3761 3762 error = nfs4_server_capabilities(server, mntfh); 3763 if (error < 0) { 3764 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3765 return error; 3766 } 3767 3768 label = nfs4_label_alloc(server, GFP_KERNEL); 3769 if (IS_ERR(label)) 3770 return PTR_ERR(label); 3771 3772 error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL); 3773 if (error < 0) { 3774 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3775 goto err_free_label; 3776 } 3777 3778 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3779 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3780 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3781 3782 err_free_label: 3783 nfs4_label_free(label); 3784 3785 return error; 3786 } 3787 3788 /* 3789 * Get locations and (maybe) other attributes of a referral. 3790 * Note that we'll actually follow the referral later when 3791 * we detect fsid mismatch in inode revalidation 3792 */ 3793 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3794 const struct qstr *name, struct nfs_fattr *fattr, 3795 struct nfs_fh *fhandle) 3796 { 3797 int status = -ENOMEM; 3798 struct page *page = NULL; 3799 struct nfs4_fs_locations *locations = NULL; 3800 3801 page = alloc_page(GFP_KERNEL); 3802 if (page == NULL) 3803 goto out; 3804 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3805 if (locations == NULL) 3806 goto out; 3807 3808 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3809 if (status != 0) 3810 goto out; 3811 3812 /* 3813 * If the fsid didn't change, this is a migration event, not a 3814 * referral. Cause us to drop into the exception handler, which 3815 * will kick off migration recovery. 3816 */ 3817 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3818 dprintk("%s: server did not return a different fsid for" 3819 " a referral at %s\n", __func__, name->name); 3820 status = -NFS4ERR_MOVED; 3821 goto out; 3822 } 3823 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3824 nfs_fixup_referral_attributes(&locations->fattr); 3825 3826 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3827 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3828 memset(fhandle, 0, sizeof(struct nfs_fh)); 3829 out: 3830 if (page) 3831 __free_page(page); 3832 kfree(locations); 3833 return status; 3834 } 3835 3836 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3837 struct nfs_fattr *fattr, struct nfs4_label *label, 3838 struct inode *inode) 3839 { 3840 __u32 bitmask[NFS4_BITMASK_SZ]; 3841 struct nfs4_getattr_arg args = { 3842 .fh = fhandle, 3843 .bitmask = bitmask, 3844 }; 3845 struct nfs4_getattr_res res = { 3846 .fattr = fattr, 3847 .label = label, 3848 .server = server, 3849 }; 3850 struct rpc_message msg = { 3851 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3852 .rpc_argp = &args, 3853 .rpc_resp = &res, 3854 }; 3855 3856 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode); 3857 3858 nfs_fattr_init(fattr); 3859 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3860 } 3861 3862 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3863 struct nfs_fattr *fattr, struct nfs4_label *label, 3864 struct inode *inode) 3865 { 3866 struct nfs4_exception exception = { }; 3867 int err; 3868 do { 3869 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode); 3870 trace_nfs4_getattr(server, fhandle, fattr, err); 3871 err = nfs4_handle_exception(server, err, 3872 &exception); 3873 } while (exception.retry); 3874 return err; 3875 } 3876 3877 /* 3878 * The file is not closed if it is opened due to the a request to change 3879 * the size of the file. The open call will not be needed once the 3880 * VFS layer lookup-intents are implemented. 3881 * 3882 * Close is called when the inode is destroyed. 3883 * If we haven't opened the file for O_WRONLY, we 3884 * need to in the size_change case to obtain a stateid. 3885 * 3886 * Got race? 3887 * Because OPEN is always done by name in nfsv4, it is 3888 * possible that we opened a different file by the same 3889 * name. We can recognize this race condition, but we 3890 * can't do anything about it besides returning an error. 3891 * 3892 * This will be fixed with VFS changes (lookup-intent). 3893 */ 3894 static int 3895 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3896 struct iattr *sattr) 3897 { 3898 struct inode *inode = d_inode(dentry); 3899 struct rpc_cred *cred = NULL; 3900 struct nfs_open_context *ctx = NULL; 3901 struct nfs4_label *label = NULL; 3902 int status; 3903 3904 if (pnfs_ld_layoutret_on_setattr(inode) && 3905 sattr->ia_valid & ATTR_SIZE && 3906 sattr->ia_size < i_size_read(inode)) 3907 pnfs_commit_and_return_layout(inode); 3908 3909 nfs_fattr_init(fattr); 3910 3911 /* Deal with open(O_TRUNC) */ 3912 if (sattr->ia_valid & ATTR_OPEN) 3913 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3914 3915 /* Optimization: if the end result is no change, don't RPC */ 3916 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3917 return 0; 3918 3919 /* Search for an existing open(O_WRITE) file */ 3920 if (sattr->ia_valid & ATTR_FILE) { 3921 3922 ctx = nfs_file_open_context(sattr->ia_file); 3923 if (ctx) 3924 cred = ctx->cred; 3925 } 3926 3927 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3928 if (IS_ERR(label)) 3929 return PTR_ERR(label); 3930 3931 /* Return any delegations if we're going to change ACLs */ 3932 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 3933 nfs4_inode_make_writeable(inode); 3934 3935 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label); 3936 if (status == 0) { 3937 nfs_setattr_update_inode(inode, sattr, fattr); 3938 nfs_setsecurity(inode, fattr, label); 3939 } 3940 nfs4_label_free(label); 3941 return status; 3942 } 3943 3944 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3945 const struct qstr *name, struct nfs_fh *fhandle, 3946 struct nfs_fattr *fattr, struct nfs4_label *label) 3947 { 3948 struct nfs_server *server = NFS_SERVER(dir); 3949 int status; 3950 struct nfs4_lookup_arg args = { 3951 .bitmask = server->attr_bitmask, 3952 .dir_fh = NFS_FH(dir), 3953 .name = name, 3954 }; 3955 struct nfs4_lookup_res res = { 3956 .server = server, 3957 .fattr = fattr, 3958 .label = label, 3959 .fh = fhandle, 3960 }; 3961 struct rpc_message msg = { 3962 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3963 .rpc_argp = &args, 3964 .rpc_resp = &res, 3965 }; 3966 3967 args.bitmask = nfs4_bitmask(server, label); 3968 3969 nfs_fattr_init(fattr); 3970 3971 dprintk("NFS call lookup %s\n", name->name); 3972 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3973 dprintk("NFS reply lookup: %d\n", status); 3974 return status; 3975 } 3976 3977 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3978 { 3979 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3980 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3981 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3982 fattr->nlink = 2; 3983 } 3984 3985 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3986 const struct qstr *name, struct nfs_fh *fhandle, 3987 struct nfs_fattr *fattr, struct nfs4_label *label) 3988 { 3989 struct nfs4_exception exception = { }; 3990 struct rpc_clnt *client = *clnt; 3991 int err; 3992 do { 3993 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3994 trace_nfs4_lookup(dir, name, err); 3995 switch (err) { 3996 case -NFS4ERR_BADNAME: 3997 err = -ENOENT; 3998 goto out; 3999 case -NFS4ERR_MOVED: 4000 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4001 if (err == -NFS4ERR_MOVED) 4002 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4003 goto out; 4004 case -NFS4ERR_WRONGSEC: 4005 err = -EPERM; 4006 if (client != *clnt) 4007 goto out; 4008 client = nfs4_negotiate_security(client, dir, name); 4009 if (IS_ERR(client)) 4010 return PTR_ERR(client); 4011 4012 exception.retry = 1; 4013 break; 4014 default: 4015 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4016 } 4017 } while (exception.retry); 4018 4019 out: 4020 if (err == 0) 4021 *clnt = client; 4022 else if (client != *clnt) 4023 rpc_shutdown_client(client); 4024 4025 return err; 4026 } 4027 4028 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 4029 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4030 struct nfs4_label *label) 4031 { 4032 int status; 4033 struct rpc_clnt *client = NFS_CLIENT(dir); 4034 4035 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 4036 if (client != NFS_CLIENT(dir)) { 4037 rpc_shutdown_client(client); 4038 nfs_fixup_secinfo_attributes(fattr); 4039 } 4040 return status; 4041 } 4042 4043 struct rpc_clnt * 4044 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name, 4045 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4046 { 4047 struct rpc_clnt *client = NFS_CLIENT(dir); 4048 int status; 4049 4050 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 4051 if (status < 0) 4052 return ERR_PTR(status); 4053 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4054 } 4055 4056 static int _nfs4_proc_lookupp(struct inode *inode, 4057 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4058 struct nfs4_label *label) 4059 { 4060 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4061 struct nfs_server *server = NFS_SERVER(inode); 4062 int status; 4063 struct nfs4_lookupp_arg args = { 4064 .bitmask = server->attr_bitmask, 4065 .fh = NFS_FH(inode), 4066 }; 4067 struct nfs4_lookupp_res res = { 4068 .server = server, 4069 .fattr = fattr, 4070 .label = label, 4071 .fh = fhandle, 4072 }; 4073 struct rpc_message msg = { 4074 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4075 .rpc_argp = &args, 4076 .rpc_resp = &res, 4077 }; 4078 4079 args.bitmask = nfs4_bitmask(server, label); 4080 4081 nfs_fattr_init(fattr); 4082 4083 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4084 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4085 &res.seq_res, 0); 4086 dprintk("NFS reply lookupp: %d\n", status); 4087 return status; 4088 } 4089 4090 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4091 struct nfs_fattr *fattr, struct nfs4_label *label) 4092 { 4093 struct nfs4_exception exception = { }; 4094 int err; 4095 do { 4096 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label); 4097 trace_nfs4_lookupp(inode, err); 4098 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4099 &exception); 4100 } while (exception.retry); 4101 return err; 4102 } 4103 4104 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4105 { 4106 struct nfs_server *server = NFS_SERVER(inode); 4107 struct nfs4_accessargs args = { 4108 .fh = NFS_FH(inode), 4109 .access = entry->mask, 4110 }; 4111 struct nfs4_accessres res = { 4112 .server = server, 4113 }; 4114 struct rpc_message msg = { 4115 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4116 .rpc_argp = &args, 4117 .rpc_resp = &res, 4118 .rpc_cred = entry->cred, 4119 }; 4120 int status = 0; 4121 4122 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4123 res.fattr = nfs_alloc_fattr(); 4124 if (res.fattr == NULL) 4125 return -ENOMEM; 4126 args.bitmask = server->cache_consistency_bitmask; 4127 } 4128 4129 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4130 if (!status) { 4131 nfs_access_set_mask(entry, res.access); 4132 if (res.fattr) 4133 nfs_refresh_inode(inode, res.fattr); 4134 } 4135 nfs_free_fattr(res.fattr); 4136 return status; 4137 } 4138 4139 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4140 { 4141 struct nfs4_exception exception = { }; 4142 int err; 4143 do { 4144 err = _nfs4_proc_access(inode, entry); 4145 trace_nfs4_access(inode, err); 4146 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4147 &exception); 4148 } while (exception.retry); 4149 return err; 4150 } 4151 4152 /* 4153 * TODO: For the time being, we don't try to get any attributes 4154 * along with any of the zero-copy operations READ, READDIR, 4155 * READLINK, WRITE. 4156 * 4157 * In the case of the first three, we want to put the GETATTR 4158 * after the read-type operation -- this is because it is hard 4159 * to predict the length of a GETATTR response in v4, and thus 4160 * align the READ data correctly. This means that the GETATTR 4161 * may end up partially falling into the page cache, and we should 4162 * shift it into the 'tail' of the xdr_buf before processing. 4163 * To do this efficiently, we need to know the total length 4164 * of data received, which doesn't seem to be available outside 4165 * of the RPC layer. 4166 * 4167 * In the case of WRITE, we also want to put the GETATTR after 4168 * the operation -- in this case because we want to make sure 4169 * we get the post-operation mtime and size. 4170 * 4171 * Both of these changes to the XDR layer would in fact be quite 4172 * minor, but I decided to leave them for a subsequent patch. 4173 */ 4174 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4175 unsigned int pgbase, unsigned int pglen) 4176 { 4177 struct nfs4_readlink args = { 4178 .fh = NFS_FH(inode), 4179 .pgbase = pgbase, 4180 .pglen = pglen, 4181 .pages = &page, 4182 }; 4183 struct nfs4_readlink_res res; 4184 struct rpc_message msg = { 4185 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4186 .rpc_argp = &args, 4187 .rpc_resp = &res, 4188 }; 4189 4190 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4191 } 4192 4193 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4194 unsigned int pgbase, unsigned int pglen) 4195 { 4196 struct nfs4_exception exception = { }; 4197 int err; 4198 do { 4199 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4200 trace_nfs4_readlink(inode, err); 4201 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4202 &exception); 4203 } while (exception.retry); 4204 return err; 4205 } 4206 4207 /* 4208 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4209 */ 4210 static int 4211 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4212 int flags) 4213 { 4214 struct nfs_server *server = NFS_SERVER(dir); 4215 struct nfs4_label l, *ilabel = NULL; 4216 struct nfs_open_context *ctx; 4217 struct nfs4_state *state; 4218 int status = 0; 4219 4220 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4221 if (IS_ERR(ctx)) 4222 return PTR_ERR(ctx); 4223 4224 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4225 4226 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4227 sattr->ia_mode &= ~current_umask(); 4228 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4229 if (IS_ERR(state)) { 4230 status = PTR_ERR(state); 4231 goto out; 4232 } 4233 out: 4234 nfs4_label_release_security(ilabel); 4235 put_nfs_open_context(ctx); 4236 return status; 4237 } 4238 4239 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) 4240 { 4241 struct nfs_server *server = NFS_SERVER(dir); 4242 struct nfs_removeargs args = { 4243 .fh = NFS_FH(dir), 4244 .name = *name, 4245 }; 4246 struct nfs_removeres res = { 4247 .server = server, 4248 }; 4249 struct rpc_message msg = { 4250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4251 .rpc_argp = &args, 4252 .rpc_resp = &res, 4253 }; 4254 unsigned long timestamp = jiffies; 4255 int status; 4256 4257 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4258 if (status == 0) 4259 update_changeattr(dir, &res.cinfo, timestamp); 4260 return status; 4261 } 4262 4263 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4264 { 4265 struct nfs4_exception exception = { }; 4266 struct inode *inode = d_inode(dentry); 4267 int err; 4268 4269 if (inode) { 4270 if (inode->i_nlink == 1) 4271 nfs4_inode_return_delegation(inode); 4272 else 4273 nfs4_inode_make_writeable(inode); 4274 } 4275 do { 4276 err = _nfs4_proc_remove(dir, &dentry->d_name); 4277 trace_nfs4_remove(dir, &dentry->d_name, err); 4278 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4279 &exception); 4280 } while (exception.retry); 4281 return err; 4282 } 4283 4284 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4285 { 4286 struct nfs4_exception exception = { }; 4287 int err; 4288 4289 do { 4290 err = _nfs4_proc_remove(dir, name); 4291 trace_nfs4_remove(dir, name, err); 4292 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4293 &exception); 4294 } while (exception.retry); 4295 return err; 4296 } 4297 4298 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4299 struct dentry *dentry, 4300 struct inode *inode) 4301 { 4302 struct nfs_removeargs *args = msg->rpc_argp; 4303 struct nfs_removeres *res = msg->rpc_resp; 4304 4305 res->server = NFS_SB(dentry->d_sb); 4306 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4307 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4308 4309 nfs_fattr_init(res->dir_attr); 4310 4311 if (inode) 4312 nfs4_inode_return_delegation(inode); 4313 } 4314 4315 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4316 { 4317 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4318 &data->args.seq_args, 4319 &data->res.seq_res, 4320 task); 4321 } 4322 4323 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4324 { 4325 struct nfs_unlinkdata *data = task->tk_calldata; 4326 struct nfs_removeres *res = &data->res; 4327 4328 if (!nfs4_sequence_done(task, &res->seq_res)) 4329 return 0; 4330 if (nfs4_async_handle_error(task, res->server, NULL, 4331 &data->timeout) == -EAGAIN) 4332 return 0; 4333 if (task->tk_status == 0) 4334 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start); 4335 return 1; 4336 } 4337 4338 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4339 struct dentry *old_dentry, 4340 struct dentry *new_dentry) 4341 { 4342 struct nfs_renameargs *arg = msg->rpc_argp; 4343 struct nfs_renameres *res = msg->rpc_resp; 4344 struct inode *old_inode = d_inode(old_dentry); 4345 struct inode *new_inode = d_inode(new_dentry); 4346 4347 if (old_inode) 4348 nfs4_inode_make_writeable(old_inode); 4349 if (new_inode) 4350 nfs4_inode_return_delegation(new_inode); 4351 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4352 res->server = NFS_SB(old_dentry->d_sb); 4353 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4354 } 4355 4356 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4357 { 4358 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4359 &data->args.seq_args, 4360 &data->res.seq_res, 4361 task); 4362 } 4363 4364 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4365 struct inode *new_dir) 4366 { 4367 struct nfs_renamedata *data = task->tk_calldata; 4368 struct nfs_renameres *res = &data->res; 4369 4370 if (!nfs4_sequence_done(task, &res->seq_res)) 4371 return 0; 4372 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4373 return 0; 4374 4375 if (task->tk_status == 0) { 4376 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start); 4377 if (new_dir != old_dir) 4378 update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start); 4379 } 4380 return 1; 4381 } 4382 4383 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4384 { 4385 struct nfs_server *server = NFS_SERVER(inode); 4386 __u32 bitmask[NFS4_BITMASK_SZ]; 4387 struct nfs4_link_arg arg = { 4388 .fh = NFS_FH(inode), 4389 .dir_fh = NFS_FH(dir), 4390 .name = name, 4391 .bitmask = bitmask, 4392 }; 4393 struct nfs4_link_res res = { 4394 .server = server, 4395 .label = NULL, 4396 }; 4397 struct rpc_message msg = { 4398 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4399 .rpc_argp = &arg, 4400 .rpc_resp = &res, 4401 }; 4402 int status = -ENOMEM; 4403 4404 res.fattr = nfs_alloc_fattr(); 4405 if (res.fattr == NULL) 4406 goto out; 4407 4408 res.label = nfs4_label_alloc(server, GFP_KERNEL); 4409 if (IS_ERR(res.label)) { 4410 status = PTR_ERR(res.label); 4411 goto out; 4412 } 4413 4414 nfs4_inode_make_writeable(inode); 4415 nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode); 4416 4417 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4418 if (!status) { 4419 update_changeattr(dir, &res.cinfo, res.fattr->time_start); 4420 status = nfs_post_op_update_inode(inode, res.fattr); 4421 if (!status) 4422 nfs_setsecurity(inode, res.fattr, res.label); 4423 } 4424 4425 4426 nfs4_label_free(res.label); 4427 4428 out: 4429 nfs_free_fattr(res.fattr); 4430 return status; 4431 } 4432 4433 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4434 { 4435 struct nfs4_exception exception = { }; 4436 int err; 4437 do { 4438 err = nfs4_handle_exception(NFS_SERVER(inode), 4439 _nfs4_proc_link(inode, dir, name), 4440 &exception); 4441 } while (exception.retry); 4442 return err; 4443 } 4444 4445 struct nfs4_createdata { 4446 struct rpc_message msg; 4447 struct nfs4_create_arg arg; 4448 struct nfs4_create_res res; 4449 struct nfs_fh fh; 4450 struct nfs_fattr fattr; 4451 struct nfs4_label *label; 4452 }; 4453 4454 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4455 const struct qstr *name, struct iattr *sattr, u32 ftype) 4456 { 4457 struct nfs4_createdata *data; 4458 4459 data = kzalloc(sizeof(*data), GFP_KERNEL); 4460 if (data != NULL) { 4461 struct nfs_server *server = NFS_SERVER(dir); 4462 4463 data->label = nfs4_label_alloc(server, GFP_KERNEL); 4464 if (IS_ERR(data->label)) 4465 goto out_free; 4466 4467 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4468 data->msg.rpc_argp = &data->arg; 4469 data->msg.rpc_resp = &data->res; 4470 data->arg.dir_fh = NFS_FH(dir); 4471 data->arg.server = server; 4472 data->arg.name = name; 4473 data->arg.attrs = sattr; 4474 data->arg.ftype = ftype; 4475 data->arg.bitmask = nfs4_bitmask(server, data->label); 4476 data->arg.umask = current_umask(); 4477 data->res.server = server; 4478 data->res.fh = &data->fh; 4479 data->res.fattr = &data->fattr; 4480 data->res.label = data->label; 4481 nfs_fattr_init(data->res.fattr); 4482 } 4483 return data; 4484 out_free: 4485 kfree(data); 4486 return NULL; 4487 } 4488 4489 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4490 { 4491 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4492 &data->arg.seq_args, &data->res.seq_res, 1); 4493 if (status == 0) { 4494 update_changeattr(dir, &data->res.dir_cinfo, 4495 data->res.fattr->time_start); 4496 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 4497 } 4498 return status; 4499 } 4500 4501 static void nfs4_free_createdata(struct nfs4_createdata *data) 4502 { 4503 nfs4_label_free(data->label); 4504 kfree(data); 4505 } 4506 4507 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4508 struct page *page, unsigned int len, struct iattr *sattr, 4509 struct nfs4_label *label) 4510 { 4511 struct nfs4_createdata *data; 4512 int status = -ENAMETOOLONG; 4513 4514 if (len > NFS4_MAXPATHLEN) 4515 goto out; 4516 4517 status = -ENOMEM; 4518 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 4519 if (data == NULL) 4520 goto out; 4521 4522 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 4523 data->arg.u.symlink.pages = &page; 4524 data->arg.u.symlink.len = len; 4525 data->arg.label = label; 4526 4527 status = nfs4_do_create(dir, dentry, data); 4528 4529 nfs4_free_createdata(data); 4530 out: 4531 return status; 4532 } 4533 4534 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4535 struct page *page, unsigned int len, struct iattr *sattr) 4536 { 4537 struct nfs4_exception exception = { }; 4538 struct nfs4_label l, *label = NULL; 4539 int err; 4540 4541 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4542 4543 do { 4544 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4545 trace_nfs4_symlink(dir, &dentry->d_name, err); 4546 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4547 &exception); 4548 } while (exception.retry); 4549 4550 nfs4_label_release_security(label); 4551 return err; 4552 } 4553 4554 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4555 struct iattr *sattr, struct nfs4_label *label) 4556 { 4557 struct nfs4_createdata *data; 4558 int status = -ENOMEM; 4559 4560 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4561 if (data == NULL) 4562 goto out; 4563 4564 data->arg.label = label; 4565 status = nfs4_do_create(dir, dentry, data); 4566 4567 nfs4_free_createdata(data); 4568 out: 4569 return status; 4570 } 4571 4572 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4573 struct iattr *sattr) 4574 { 4575 struct nfs_server *server = NFS_SERVER(dir); 4576 struct nfs4_exception exception = { }; 4577 struct nfs4_label l, *label = NULL; 4578 int err; 4579 4580 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4581 4582 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4583 sattr->ia_mode &= ~current_umask(); 4584 do { 4585 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4586 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4587 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4588 &exception); 4589 } while (exception.retry); 4590 nfs4_label_release_security(label); 4591 4592 return err; 4593 } 4594 4595 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4596 u64 cookie, struct page **pages, unsigned int count, bool plus) 4597 { 4598 struct inode *dir = d_inode(dentry); 4599 struct nfs4_readdir_arg args = { 4600 .fh = NFS_FH(dir), 4601 .pages = pages, 4602 .pgbase = 0, 4603 .count = count, 4604 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4605 .plus = plus, 4606 }; 4607 struct nfs4_readdir_res res; 4608 struct rpc_message msg = { 4609 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4610 .rpc_argp = &args, 4611 .rpc_resp = &res, 4612 .rpc_cred = cred, 4613 }; 4614 int status; 4615 4616 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4617 dentry, 4618 (unsigned long long)cookie); 4619 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4620 res.pgbase = args.pgbase; 4621 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4622 if (status >= 0) { 4623 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4624 status += args.pgbase; 4625 } 4626 4627 nfs_invalidate_atime(dir); 4628 4629 dprintk("%s: returns %d\n", __func__, status); 4630 return status; 4631 } 4632 4633 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4634 u64 cookie, struct page **pages, unsigned int count, bool plus) 4635 { 4636 struct nfs4_exception exception = { }; 4637 int err; 4638 do { 4639 err = _nfs4_proc_readdir(dentry, cred, cookie, 4640 pages, count, plus); 4641 trace_nfs4_readdir(d_inode(dentry), err); 4642 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4643 &exception); 4644 } while (exception.retry); 4645 return err; 4646 } 4647 4648 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4649 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4650 { 4651 struct nfs4_createdata *data; 4652 int mode = sattr->ia_mode; 4653 int status = -ENOMEM; 4654 4655 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4656 if (data == NULL) 4657 goto out; 4658 4659 if (S_ISFIFO(mode)) 4660 data->arg.ftype = NF4FIFO; 4661 else if (S_ISBLK(mode)) { 4662 data->arg.ftype = NF4BLK; 4663 data->arg.u.device.specdata1 = MAJOR(rdev); 4664 data->arg.u.device.specdata2 = MINOR(rdev); 4665 } 4666 else if (S_ISCHR(mode)) { 4667 data->arg.ftype = NF4CHR; 4668 data->arg.u.device.specdata1 = MAJOR(rdev); 4669 data->arg.u.device.specdata2 = MINOR(rdev); 4670 } else if (!S_ISSOCK(mode)) { 4671 status = -EINVAL; 4672 goto out_free; 4673 } 4674 4675 data->arg.label = label; 4676 status = nfs4_do_create(dir, dentry, data); 4677 out_free: 4678 nfs4_free_createdata(data); 4679 out: 4680 return status; 4681 } 4682 4683 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4684 struct iattr *sattr, dev_t rdev) 4685 { 4686 struct nfs_server *server = NFS_SERVER(dir); 4687 struct nfs4_exception exception = { }; 4688 struct nfs4_label l, *label = NULL; 4689 int err; 4690 4691 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4692 4693 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4694 sattr->ia_mode &= ~current_umask(); 4695 do { 4696 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 4697 trace_nfs4_mknod(dir, &dentry->d_name, err); 4698 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4699 &exception); 4700 } while (exception.retry); 4701 4702 nfs4_label_release_security(label); 4703 4704 return err; 4705 } 4706 4707 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 4708 struct nfs_fsstat *fsstat) 4709 { 4710 struct nfs4_statfs_arg args = { 4711 .fh = fhandle, 4712 .bitmask = server->attr_bitmask, 4713 }; 4714 struct nfs4_statfs_res res = { 4715 .fsstat = fsstat, 4716 }; 4717 struct rpc_message msg = { 4718 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 4719 .rpc_argp = &args, 4720 .rpc_resp = &res, 4721 }; 4722 4723 nfs_fattr_init(fsstat->fattr); 4724 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4725 } 4726 4727 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 4728 { 4729 struct nfs4_exception exception = { }; 4730 int err; 4731 do { 4732 err = nfs4_handle_exception(server, 4733 _nfs4_proc_statfs(server, fhandle, fsstat), 4734 &exception); 4735 } while (exception.retry); 4736 return err; 4737 } 4738 4739 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 4740 struct nfs_fsinfo *fsinfo) 4741 { 4742 struct nfs4_fsinfo_arg args = { 4743 .fh = fhandle, 4744 .bitmask = server->attr_bitmask, 4745 }; 4746 struct nfs4_fsinfo_res res = { 4747 .fsinfo = fsinfo, 4748 }; 4749 struct rpc_message msg = { 4750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 4751 .rpc_argp = &args, 4752 .rpc_resp = &res, 4753 }; 4754 4755 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4756 } 4757 4758 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4759 { 4760 struct nfs4_exception exception = { }; 4761 unsigned long now = jiffies; 4762 int err; 4763 4764 do { 4765 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4766 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4767 if (err == 0) { 4768 nfs4_set_lease_period(server->nfs_client, 4769 fsinfo->lease_time * HZ, 4770 now); 4771 break; 4772 } 4773 err = nfs4_handle_exception(server, err, &exception); 4774 } while (exception.retry); 4775 return err; 4776 } 4777 4778 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4779 { 4780 int error; 4781 4782 nfs_fattr_init(fsinfo->fattr); 4783 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4784 if (error == 0) { 4785 /* block layout checks this! */ 4786 server->pnfs_blksize = fsinfo->blksize; 4787 set_pnfs_layoutdriver(server, fhandle, fsinfo); 4788 } 4789 4790 return error; 4791 } 4792 4793 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4794 struct nfs_pathconf *pathconf) 4795 { 4796 struct nfs4_pathconf_arg args = { 4797 .fh = fhandle, 4798 .bitmask = server->attr_bitmask, 4799 }; 4800 struct nfs4_pathconf_res res = { 4801 .pathconf = pathconf, 4802 }; 4803 struct rpc_message msg = { 4804 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4805 .rpc_argp = &args, 4806 .rpc_resp = &res, 4807 }; 4808 4809 /* None of the pathconf attributes are mandatory to implement */ 4810 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4811 memset(pathconf, 0, sizeof(*pathconf)); 4812 return 0; 4813 } 4814 4815 nfs_fattr_init(pathconf->fattr); 4816 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4817 } 4818 4819 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4820 struct nfs_pathconf *pathconf) 4821 { 4822 struct nfs4_exception exception = { }; 4823 int err; 4824 4825 do { 4826 err = nfs4_handle_exception(server, 4827 _nfs4_proc_pathconf(server, fhandle, pathconf), 4828 &exception); 4829 } while (exception.retry); 4830 return err; 4831 } 4832 4833 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4834 const struct nfs_open_context *ctx, 4835 const struct nfs_lock_context *l_ctx, 4836 fmode_t fmode) 4837 { 4838 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 4839 } 4840 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4841 4842 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4843 const struct nfs_open_context *ctx, 4844 const struct nfs_lock_context *l_ctx, 4845 fmode_t fmode) 4846 { 4847 nfs4_stateid current_stateid; 4848 4849 /* If the current stateid represents a lost lock, then exit */ 4850 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4851 return true; 4852 return nfs4_stateid_match(stateid, ¤t_stateid); 4853 } 4854 4855 static bool nfs4_error_stateid_expired(int err) 4856 { 4857 switch (err) { 4858 case -NFS4ERR_DELEG_REVOKED: 4859 case -NFS4ERR_ADMIN_REVOKED: 4860 case -NFS4ERR_BAD_STATEID: 4861 case -NFS4ERR_STALE_STATEID: 4862 case -NFS4ERR_OLD_STATEID: 4863 case -NFS4ERR_OPENMODE: 4864 case -NFS4ERR_EXPIRED: 4865 return true; 4866 } 4867 return false; 4868 } 4869 4870 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4871 { 4872 struct nfs_server *server = NFS_SERVER(hdr->inode); 4873 4874 trace_nfs4_read(hdr, task->tk_status); 4875 if (task->tk_status < 0) { 4876 struct nfs4_exception exception = { 4877 .inode = hdr->inode, 4878 .state = hdr->args.context->state, 4879 .stateid = &hdr->args.stateid, 4880 }; 4881 task->tk_status = nfs4_async_handle_exception(task, 4882 server, task->tk_status, &exception); 4883 if (exception.retry) { 4884 rpc_restart_call_prepare(task); 4885 return -EAGAIN; 4886 } 4887 } 4888 4889 if (task->tk_status > 0) 4890 renew_lease(server, hdr->timestamp); 4891 return 0; 4892 } 4893 4894 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4895 struct nfs_pgio_args *args) 4896 { 4897 4898 if (!nfs4_error_stateid_expired(task->tk_status) || 4899 nfs4_stateid_is_current(&args->stateid, 4900 args->context, 4901 args->lock_context, 4902 FMODE_READ)) 4903 return false; 4904 rpc_restart_call_prepare(task); 4905 return true; 4906 } 4907 4908 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4909 { 4910 4911 dprintk("--> %s\n", __func__); 4912 4913 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4914 return -EAGAIN; 4915 if (nfs4_read_stateid_changed(task, &hdr->args)) 4916 return -EAGAIN; 4917 if (task->tk_status > 0) 4918 nfs_invalidate_atime(hdr->inode); 4919 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4920 nfs4_read_done_cb(task, hdr); 4921 } 4922 4923 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4924 struct rpc_message *msg) 4925 { 4926 hdr->timestamp = jiffies; 4927 if (!hdr->pgio_done_cb) 4928 hdr->pgio_done_cb = nfs4_read_done_cb; 4929 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4930 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 4931 } 4932 4933 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4934 struct nfs_pgio_header *hdr) 4935 { 4936 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 4937 &hdr->args.seq_args, 4938 &hdr->res.seq_res, 4939 task)) 4940 return 0; 4941 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4942 hdr->args.lock_context, 4943 hdr->rw_mode) == -EIO) 4944 return -EIO; 4945 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4946 return -EIO; 4947 return 0; 4948 } 4949 4950 static int nfs4_write_done_cb(struct rpc_task *task, 4951 struct nfs_pgio_header *hdr) 4952 { 4953 struct inode *inode = hdr->inode; 4954 4955 trace_nfs4_write(hdr, task->tk_status); 4956 if (task->tk_status < 0) { 4957 struct nfs4_exception exception = { 4958 .inode = hdr->inode, 4959 .state = hdr->args.context->state, 4960 .stateid = &hdr->args.stateid, 4961 }; 4962 task->tk_status = nfs4_async_handle_exception(task, 4963 NFS_SERVER(inode), task->tk_status, 4964 &exception); 4965 if (exception.retry) { 4966 rpc_restart_call_prepare(task); 4967 return -EAGAIN; 4968 } 4969 } 4970 if (task->tk_status >= 0) { 4971 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4972 nfs_writeback_update_inode(hdr); 4973 } 4974 return 0; 4975 } 4976 4977 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4978 struct nfs_pgio_args *args) 4979 { 4980 4981 if (!nfs4_error_stateid_expired(task->tk_status) || 4982 nfs4_stateid_is_current(&args->stateid, 4983 args->context, 4984 args->lock_context, 4985 FMODE_WRITE)) 4986 return false; 4987 rpc_restart_call_prepare(task); 4988 return true; 4989 } 4990 4991 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4992 { 4993 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4994 return -EAGAIN; 4995 if (nfs4_write_stateid_changed(task, &hdr->args)) 4996 return -EAGAIN; 4997 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4998 nfs4_write_done_cb(task, hdr); 4999 } 5000 5001 static 5002 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5003 { 5004 /* Don't request attributes for pNFS or O_DIRECT writes */ 5005 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5006 return false; 5007 /* Otherwise, request attributes if and only if we don't hold 5008 * a delegation 5009 */ 5010 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5011 } 5012 5013 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5014 struct rpc_message *msg, 5015 struct rpc_clnt **clnt) 5016 { 5017 struct nfs_server *server = NFS_SERVER(hdr->inode); 5018 5019 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5020 hdr->args.bitmask = NULL; 5021 hdr->res.fattr = NULL; 5022 } else 5023 hdr->args.bitmask = server->cache_consistency_bitmask; 5024 5025 if (!hdr->pgio_done_cb) 5026 hdr->pgio_done_cb = nfs4_write_done_cb; 5027 hdr->res.server = server; 5028 hdr->timestamp = jiffies; 5029 5030 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5031 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1, 0); 5032 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 5033 } 5034 5035 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5036 { 5037 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5038 &data->args.seq_args, 5039 &data->res.seq_res, 5040 task); 5041 } 5042 5043 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5044 { 5045 struct inode *inode = data->inode; 5046 5047 trace_nfs4_commit(data, task->tk_status); 5048 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5049 NULL, NULL) == -EAGAIN) { 5050 rpc_restart_call_prepare(task); 5051 return -EAGAIN; 5052 } 5053 return 0; 5054 } 5055 5056 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5057 { 5058 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5059 return -EAGAIN; 5060 return data->commit_done_cb(task, data); 5061 } 5062 5063 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5064 struct rpc_clnt **clnt) 5065 { 5066 struct nfs_server *server = NFS_SERVER(data->inode); 5067 5068 if (data->commit_done_cb == NULL) 5069 data->commit_done_cb = nfs4_commit_done_cb; 5070 data->res.server = server; 5071 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5072 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5073 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5074 } 5075 5076 struct nfs4_renewdata { 5077 struct nfs_client *client; 5078 unsigned long timestamp; 5079 }; 5080 5081 /* 5082 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5083 * standalone procedure for queueing an asynchronous RENEW. 5084 */ 5085 static void nfs4_renew_release(void *calldata) 5086 { 5087 struct nfs4_renewdata *data = calldata; 5088 struct nfs_client *clp = data->client; 5089 5090 if (refcount_read(&clp->cl_count) > 1) 5091 nfs4_schedule_state_renewal(clp); 5092 nfs_put_client(clp); 5093 kfree(data); 5094 } 5095 5096 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5097 { 5098 struct nfs4_renewdata *data = calldata; 5099 struct nfs_client *clp = data->client; 5100 unsigned long timestamp = data->timestamp; 5101 5102 trace_nfs4_renew_async(clp, task->tk_status); 5103 switch (task->tk_status) { 5104 case 0: 5105 break; 5106 case -NFS4ERR_LEASE_MOVED: 5107 nfs4_schedule_lease_moved_recovery(clp); 5108 break; 5109 default: 5110 /* Unless we're shutting down, schedule state recovery! */ 5111 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5112 return; 5113 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5114 nfs4_schedule_lease_recovery(clp); 5115 return; 5116 } 5117 nfs4_schedule_path_down_recovery(clp); 5118 } 5119 do_renew_lease(clp, timestamp); 5120 } 5121 5122 static const struct rpc_call_ops nfs4_renew_ops = { 5123 .rpc_call_done = nfs4_renew_done, 5124 .rpc_release = nfs4_renew_release, 5125 }; 5126 5127 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 5128 { 5129 struct rpc_message msg = { 5130 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5131 .rpc_argp = clp, 5132 .rpc_cred = cred, 5133 }; 5134 struct nfs4_renewdata *data; 5135 5136 if (renew_flags == 0) 5137 return 0; 5138 if (!refcount_inc_not_zero(&clp->cl_count)) 5139 return -EIO; 5140 data = kmalloc(sizeof(*data), GFP_NOFS); 5141 if (data == NULL) { 5142 nfs_put_client(clp); 5143 return -ENOMEM; 5144 } 5145 data->client = clp; 5146 data->timestamp = jiffies; 5147 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5148 &nfs4_renew_ops, data); 5149 } 5150 5151 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 5152 { 5153 struct rpc_message msg = { 5154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5155 .rpc_argp = clp, 5156 .rpc_cred = cred, 5157 }; 5158 unsigned long now = jiffies; 5159 int status; 5160 5161 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5162 if (status < 0) 5163 return status; 5164 do_renew_lease(clp, now); 5165 return 0; 5166 } 5167 5168 static inline int nfs4_server_supports_acls(struct nfs_server *server) 5169 { 5170 return server->caps & NFS_CAP_ACLS; 5171 } 5172 5173 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5174 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5175 * the stack. 5176 */ 5177 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5178 5179 static int buf_to_pages_noslab(const void *buf, size_t buflen, 5180 struct page **pages) 5181 { 5182 struct page *newpage, **spages; 5183 int rc = 0; 5184 size_t len; 5185 spages = pages; 5186 5187 do { 5188 len = min_t(size_t, PAGE_SIZE, buflen); 5189 newpage = alloc_page(GFP_KERNEL); 5190 5191 if (newpage == NULL) 5192 goto unwind; 5193 memcpy(page_address(newpage), buf, len); 5194 buf += len; 5195 buflen -= len; 5196 *pages++ = newpage; 5197 rc++; 5198 } while (buflen != 0); 5199 5200 return rc; 5201 5202 unwind: 5203 for(; rc > 0; rc--) 5204 __free_page(spages[rc-1]); 5205 return -ENOMEM; 5206 } 5207 5208 struct nfs4_cached_acl { 5209 int cached; 5210 size_t len; 5211 char data[0]; 5212 }; 5213 5214 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5215 { 5216 struct nfs_inode *nfsi = NFS_I(inode); 5217 5218 spin_lock(&inode->i_lock); 5219 kfree(nfsi->nfs4_acl); 5220 nfsi->nfs4_acl = acl; 5221 spin_unlock(&inode->i_lock); 5222 } 5223 5224 static void nfs4_zap_acl_attr(struct inode *inode) 5225 { 5226 nfs4_set_cached_acl(inode, NULL); 5227 } 5228 5229 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 5230 { 5231 struct nfs_inode *nfsi = NFS_I(inode); 5232 struct nfs4_cached_acl *acl; 5233 int ret = -ENOENT; 5234 5235 spin_lock(&inode->i_lock); 5236 acl = nfsi->nfs4_acl; 5237 if (acl == NULL) 5238 goto out; 5239 if (buf == NULL) /* user is just asking for length */ 5240 goto out_len; 5241 if (acl->cached == 0) 5242 goto out; 5243 ret = -ERANGE; /* see getxattr(2) man page */ 5244 if (acl->len > buflen) 5245 goto out; 5246 memcpy(buf, acl->data, acl->len); 5247 out_len: 5248 ret = acl->len; 5249 out: 5250 spin_unlock(&inode->i_lock); 5251 return ret; 5252 } 5253 5254 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 5255 { 5256 struct nfs4_cached_acl *acl; 5257 size_t buflen = sizeof(*acl) + acl_len; 5258 5259 if (buflen <= PAGE_SIZE) { 5260 acl = kmalloc(buflen, GFP_KERNEL); 5261 if (acl == NULL) 5262 goto out; 5263 acl->cached = 1; 5264 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5265 } else { 5266 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5267 if (acl == NULL) 5268 goto out; 5269 acl->cached = 0; 5270 } 5271 acl->len = acl_len; 5272 out: 5273 nfs4_set_cached_acl(inode, acl); 5274 } 5275 5276 /* 5277 * The getxattr API returns the required buffer length when called with a 5278 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5279 * the required buf. On a NULL buf, we send a page of data to the server 5280 * guessing that the ACL request can be serviced by a page. If so, we cache 5281 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5282 * the cache. If not so, we throw away the page, and cache the required 5283 * length. The next getxattr call will then produce another round trip to 5284 * the server, this time with the input buf of the required size. 5285 */ 5286 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5287 { 5288 struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, }; 5289 struct nfs_getaclargs args = { 5290 .fh = NFS_FH(inode), 5291 .acl_pages = pages, 5292 .acl_len = buflen, 5293 }; 5294 struct nfs_getaclres res = { 5295 .acl_len = buflen, 5296 }; 5297 struct rpc_message msg = { 5298 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5299 .rpc_argp = &args, 5300 .rpc_resp = &res, 5301 }; 5302 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5303 int ret = -ENOMEM, i; 5304 5305 if (npages > ARRAY_SIZE(pages)) 5306 return -ERANGE; 5307 5308 for (i = 0; i < npages; i++) { 5309 pages[i] = alloc_page(GFP_KERNEL); 5310 if (!pages[i]) 5311 goto out_free; 5312 } 5313 5314 /* for decoding across pages */ 5315 res.acl_scratch = alloc_page(GFP_KERNEL); 5316 if (!res.acl_scratch) 5317 goto out_free; 5318 5319 args.acl_len = npages * PAGE_SIZE; 5320 5321 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5322 __func__, buf, buflen, npages, args.acl_len); 5323 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5324 &msg, &args.seq_args, &res.seq_res, 0); 5325 if (ret) 5326 goto out_free; 5327 5328 /* Handle the case where the passed-in buffer is too short */ 5329 if (res.acl_flags & NFS4_ACL_TRUNC) { 5330 /* Did the user only issue a request for the acl length? */ 5331 if (buf == NULL) 5332 goto out_ok; 5333 ret = -ERANGE; 5334 goto out_free; 5335 } 5336 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 5337 if (buf) { 5338 if (res.acl_len > buflen) { 5339 ret = -ERANGE; 5340 goto out_free; 5341 } 5342 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5343 } 5344 out_ok: 5345 ret = res.acl_len; 5346 out_free: 5347 for (i = 0; i < npages; i++) 5348 if (pages[i]) 5349 __free_page(pages[i]); 5350 if (res.acl_scratch) 5351 __free_page(res.acl_scratch); 5352 return ret; 5353 } 5354 5355 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5356 { 5357 struct nfs4_exception exception = { }; 5358 ssize_t ret; 5359 do { 5360 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 5361 trace_nfs4_get_acl(inode, ret); 5362 if (ret >= 0) 5363 break; 5364 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 5365 } while (exception.retry); 5366 return ret; 5367 } 5368 5369 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 5370 { 5371 struct nfs_server *server = NFS_SERVER(inode); 5372 int ret; 5373 5374 if (!nfs4_server_supports_acls(server)) 5375 return -EOPNOTSUPP; 5376 ret = nfs_revalidate_inode(server, inode); 5377 if (ret < 0) 5378 return ret; 5379 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 5380 nfs_zap_acl_cache(inode); 5381 ret = nfs4_read_cached_acl(inode, buf, buflen); 5382 if (ret != -ENOENT) 5383 /* -ENOENT is returned if there is no ACL or if there is an ACL 5384 * but no cached acl data, just the acl length */ 5385 return ret; 5386 return nfs4_get_acl_uncached(inode, buf, buflen); 5387 } 5388 5389 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5390 { 5391 struct nfs_server *server = NFS_SERVER(inode); 5392 struct page *pages[NFS4ACL_MAXPAGES]; 5393 struct nfs_setaclargs arg = { 5394 .fh = NFS_FH(inode), 5395 .acl_pages = pages, 5396 .acl_len = buflen, 5397 }; 5398 struct nfs_setaclres res; 5399 struct rpc_message msg = { 5400 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 5401 .rpc_argp = &arg, 5402 .rpc_resp = &res, 5403 }; 5404 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 5405 int ret, i; 5406 5407 if (!nfs4_server_supports_acls(server)) 5408 return -EOPNOTSUPP; 5409 if (npages > ARRAY_SIZE(pages)) 5410 return -ERANGE; 5411 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages); 5412 if (i < 0) 5413 return i; 5414 nfs4_inode_make_writeable(inode); 5415 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5416 5417 /* 5418 * Free each page after tx, so the only ref left is 5419 * held by the network stack 5420 */ 5421 for (; i > 0; i--) 5422 put_page(pages[i-1]); 5423 5424 /* 5425 * Acl update can result in inode attribute update. 5426 * so mark the attribute cache invalid. 5427 */ 5428 spin_lock(&inode->i_lock); 5429 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 5430 | NFS_INO_INVALID_CTIME 5431 | NFS_INO_REVAL_FORCED; 5432 spin_unlock(&inode->i_lock); 5433 nfs_access_zap_cache(inode); 5434 nfs_zap_acl_cache(inode); 5435 return ret; 5436 } 5437 5438 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5439 { 5440 struct nfs4_exception exception = { }; 5441 int err; 5442 do { 5443 err = __nfs4_proc_set_acl(inode, buf, buflen); 5444 trace_nfs4_set_acl(inode, err); 5445 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5446 &exception); 5447 } while (exception.retry); 5448 return err; 5449 } 5450 5451 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5452 static int _nfs4_get_security_label(struct inode *inode, void *buf, 5453 size_t buflen) 5454 { 5455 struct nfs_server *server = NFS_SERVER(inode); 5456 struct nfs_fattr fattr; 5457 struct nfs4_label label = {0, 0, buflen, buf}; 5458 5459 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5460 struct nfs4_getattr_arg arg = { 5461 .fh = NFS_FH(inode), 5462 .bitmask = bitmask, 5463 }; 5464 struct nfs4_getattr_res res = { 5465 .fattr = &fattr, 5466 .label = &label, 5467 .server = server, 5468 }; 5469 struct rpc_message msg = { 5470 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 5471 .rpc_argp = &arg, 5472 .rpc_resp = &res, 5473 }; 5474 int ret; 5475 5476 nfs_fattr_init(&fattr); 5477 5478 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 5479 if (ret) 5480 return ret; 5481 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 5482 return -ENOENT; 5483 if (buflen < label.len) 5484 return -ERANGE; 5485 return 0; 5486 } 5487 5488 static int nfs4_get_security_label(struct inode *inode, void *buf, 5489 size_t buflen) 5490 { 5491 struct nfs4_exception exception = { }; 5492 int err; 5493 5494 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5495 return -EOPNOTSUPP; 5496 5497 do { 5498 err = _nfs4_get_security_label(inode, buf, buflen); 5499 trace_nfs4_get_security_label(inode, err); 5500 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5501 &exception); 5502 } while (exception.retry); 5503 return err; 5504 } 5505 5506 static int _nfs4_do_set_security_label(struct inode *inode, 5507 struct nfs4_label *ilabel, 5508 struct nfs_fattr *fattr, 5509 struct nfs4_label *olabel) 5510 { 5511 5512 struct iattr sattr = {0}; 5513 struct nfs_server *server = NFS_SERVER(inode); 5514 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5515 struct nfs_setattrargs arg = { 5516 .fh = NFS_FH(inode), 5517 .iap = &sattr, 5518 .server = server, 5519 .bitmask = bitmask, 5520 .label = ilabel, 5521 }; 5522 struct nfs_setattrres res = { 5523 .fattr = fattr, 5524 .label = olabel, 5525 .server = server, 5526 }; 5527 struct rpc_message msg = { 5528 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 5529 .rpc_argp = &arg, 5530 .rpc_resp = &res, 5531 }; 5532 int status; 5533 5534 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 5535 5536 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5537 if (status) 5538 dprintk("%s failed: %d\n", __func__, status); 5539 5540 return status; 5541 } 5542 5543 static int nfs4_do_set_security_label(struct inode *inode, 5544 struct nfs4_label *ilabel, 5545 struct nfs_fattr *fattr, 5546 struct nfs4_label *olabel) 5547 { 5548 struct nfs4_exception exception = { }; 5549 int err; 5550 5551 do { 5552 err = _nfs4_do_set_security_label(inode, ilabel, 5553 fattr, olabel); 5554 trace_nfs4_set_security_label(inode, err); 5555 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5556 &exception); 5557 } while (exception.retry); 5558 return err; 5559 } 5560 5561 static int 5562 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 5563 { 5564 struct nfs4_label ilabel, *olabel = NULL; 5565 struct nfs_fattr fattr; 5566 struct rpc_cred *cred; 5567 int status; 5568 5569 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5570 return -EOPNOTSUPP; 5571 5572 nfs_fattr_init(&fattr); 5573 5574 ilabel.pi = 0; 5575 ilabel.lfs = 0; 5576 ilabel.label = (char *)buf; 5577 ilabel.len = buflen; 5578 5579 cred = rpc_lookup_cred(); 5580 if (IS_ERR(cred)) 5581 return PTR_ERR(cred); 5582 5583 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5584 if (IS_ERR(olabel)) { 5585 status = -PTR_ERR(olabel); 5586 goto out; 5587 } 5588 5589 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5590 if (status == 0) 5591 nfs_setsecurity(inode, &fattr, olabel); 5592 5593 nfs4_label_free(olabel); 5594 out: 5595 put_rpccred(cred); 5596 return status; 5597 } 5598 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5599 5600 5601 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5602 nfs4_verifier *bootverf) 5603 { 5604 __be32 verf[2]; 5605 5606 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5607 /* An impossible timestamp guarantees this value 5608 * will never match a generated boot time. */ 5609 verf[0] = cpu_to_be32(U32_MAX); 5610 verf[1] = cpu_to_be32(U32_MAX); 5611 } else { 5612 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5613 u64 ns = ktime_to_ns(nn->boot_time); 5614 5615 verf[0] = cpu_to_be32(ns >> 32); 5616 verf[1] = cpu_to_be32(ns); 5617 } 5618 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 5619 } 5620 5621 static int 5622 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 5623 { 5624 size_t len; 5625 char *str; 5626 5627 if (clp->cl_owner_id != NULL) 5628 return 0; 5629 5630 rcu_read_lock(); 5631 len = 14 + 5632 strlen(clp->cl_rpcclient->cl_nodename) + 5633 1 + 5634 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 5635 1; 5636 rcu_read_unlock(); 5637 if (nfs4_client_id_uniquifier[0] != '\0') 5638 len += strlen(nfs4_client_id_uniquifier) + 1; 5639 if (len > NFS4_OPAQUE_LIMIT + 1) 5640 return -EINVAL; 5641 5642 /* 5643 * Since this string is allocated at mount time, and held until the 5644 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5645 * about a memory-reclaim deadlock. 5646 */ 5647 str = kmalloc(len, GFP_KERNEL); 5648 if (!str) 5649 return -ENOMEM; 5650 5651 rcu_read_lock(); 5652 if (nfs4_client_id_uniquifier[0] != '\0') 5653 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 5654 clp->cl_rpcclient->cl_nodename, 5655 nfs4_client_id_uniquifier, 5656 rpc_peeraddr2str(clp->cl_rpcclient, 5657 RPC_DISPLAY_ADDR)); 5658 else 5659 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 5660 clp->cl_rpcclient->cl_nodename, 5661 rpc_peeraddr2str(clp->cl_rpcclient, 5662 RPC_DISPLAY_ADDR)); 5663 rcu_read_unlock(); 5664 5665 clp->cl_owner_id = str; 5666 return 0; 5667 } 5668 5669 static int 5670 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 5671 { 5672 size_t len; 5673 char *str; 5674 5675 len = 10 + 10 + 1 + 10 + 1 + 5676 strlen(nfs4_client_id_uniquifier) + 1 + 5677 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5678 5679 if (len > NFS4_OPAQUE_LIMIT + 1) 5680 return -EINVAL; 5681 5682 /* 5683 * Since this string is allocated at mount time, and held until the 5684 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5685 * about a memory-reclaim deadlock. 5686 */ 5687 str = kmalloc(len, GFP_KERNEL); 5688 if (!str) 5689 return -ENOMEM; 5690 5691 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 5692 clp->rpc_ops->version, clp->cl_minorversion, 5693 nfs4_client_id_uniquifier, 5694 clp->cl_rpcclient->cl_nodename); 5695 clp->cl_owner_id = str; 5696 return 0; 5697 } 5698 5699 static int 5700 nfs4_init_uniform_client_string(struct nfs_client *clp) 5701 { 5702 size_t len; 5703 char *str; 5704 5705 if (clp->cl_owner_id != NULL) 5706 return 0; 5707 5708 if (nfs4_client_id_uniquifier[0] != '\0') 5709 return nfs4_init_uniquifier_client_string(clp); 5710 5711 len = 10 + 10 + 1 + 10 + 1 + 5712 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5713 5714 if (len > NFS4_OPAQUE_LIMIT + 1) 5715 return -EINVAL; 5716 5717 /* 5718 * Since this string is allocated at mount time, and held until the 5719 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5720 * about a memory-reclaim deadlock. 5721 */ 5722 str = kmalloc(len, GFP_KERNEL); 5723 if (!str) 5724 return -ENOMEM; 5725 5726 scnprintf(str, len, "Linux NFSv%u.%u %s", 5727 clp->rpc_ops->version, clp->cl_minorversion, 5728 clp->cl_rpcclient->cl_nodename); 5729 clp->cl_owner_id = str; 5730 return 0; 5731 } 5732 5733 /* 5734 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 5735 * services. Advertise one based on the address family of the 5736 * clientaddr. 5737 */ 5738 static unsigned int 5739 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 5740 { 5741 if (strchr(clp->cl_ipaddr, ':') != NULL) 5742 return scnprintf(buf, len, "tcp6"); 5743 else 5744 return scnprintf(buf, len, "tcp"); 5745 } 5746 5747 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 5748 { 5749 struct nfs4_setclientid *sc = calldata; 5750 5751 if (task->tk_status == 0) 5752 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 5753 } 5754 5755 static const struct rpc_call_ops nfs4_setclientid_ops = { 5756 .rpc_call_done = nfs4_setclientid_done, 5757 }; 5758 5759 /** 5760 * nfs4_proc_setclientid - Negotiate client ID 5761 * @clp: state data structure 5762 * @program: RPC program for NFSv4 callback service 5763 * @port: IP port number for NFS4 callback service 5764 * @cred: RPC credential to use for this call 5765 * @res: where to place the result 5766 * 5767 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5768 */ 5769 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 5770 unsigned short port, struct rpc_cred *cred, 5771 struct nfs4_setclientid_res *res) 5772 { 5773 nfs4_verifier sc_verifier; 5774 struct nfs4_setclientid setclientid = { 5775 .sc_verifier = &sc_verifier, 5776 .sc_prog = program, 5777 .sc_clnt = clp, 5778 }; 5779 struct rpc_message msg = { 5780 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5781 .rpc_argp = &setclientid, 5782 .rpc_resp = res, 5783 .rpc_cred = cred, 5784 }; 5785 struct rpc_task *task; 5786 struct rpc_task_setup task_setup_data = { 5787 .rpc_client = clp->cl_rpcclient, 5788 .rpc_message = &msg, 5789 .callback_ops = &nfs4_setclientid_ops, 5790 .callback_data = &setclientid, 5791 .flags = RPC_TASK_TIMEOUT, 5792 }; 5793 int status; 5794 5795 /* nfs_client_id4 */ 5796 nfs4_init_boot_verifier(clp, &sc_verifier); 5797 5798 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5799 status = nfs4_init_uniform_client_string(clp); 5800 else 5801 status = nfs4_init_nonuniform_client_string(clp); 5802 5803 if (status) 5804 goto out; 5805 5806 /* cb_client4 */ 5807 setclientid.sc_netid_len = 5808 nfs4_init_callback_netid(clp, 5809 setclientid.sc_netid, 5810 sizeof(setclientid.sc_netid)); 5811 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5812 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5813 clp->cl_ipaddr, port >> 8, port & 255); 5814 5815 dprintk("NFS call setclientid auth=%s, '%s'\n", 5816 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5817 clp->cl_owner_id); 5818 task = rpc_run_task(&task_setup_data); 5819 if (IS_ERR(task)) { 5820 status = PTR_ERR(task); 5821 goto out; 5822 } 5823 status = task->tk_status; 5824 if (setclientid.sc_cred) { 5825 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5826 put_rpccred(setclientid.sc_cred); 5827 } 5828 rpc_put_task(task); 5829 out: 5830 trace_nfs4_setclientid(clp, status); 5831 dprintk("NFS reply setclientid: %d\n", status); 5832 return status; 5833 } 5834 5835 /** 5836 * nfs4_proc_setclientid_confirm - Confirm client ID 5837 * @clp: state data structure 5838 * @res: result of a previous SETCLIENTID 5839 * @cred: RPC credential to use for this call 5840 * 5841 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5842 */ 5843 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5844 struct nfs4_setclientid_res *arg, 5845 struct rpc_cred *cred) 5846 { 5847 struct rpc_message msg = { 5848 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5849 .rpc_argp = arg, 5850 .rpc_cred = cred, 5851 }; 5852 int status; 5853 5854 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5855 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5856 clp->cl_clientid); 5857 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5858 trace_nfs4_setclientid_confirm(clp, status); 5859 dprintk("NFS reply setclientid_confirm: %d\n", status); 5860 return status; 5861 } 5862 5863 struct nfs4_delegreturndata { 5864 struct nfs4_delegreturnargs args; 5865 struct nfs4_delegreturnres res; 5866 struct nfs_fh fh; 5867 nfs4_stateid stateid; 5868 unsigned long timestamp; 5869 struct { 5870 struct nfs4_layoutreturn_args arg; 5871 struct nfs4_layoutreturn_res res; 5872 struct nfs4_xdr_opaque_data ld_private; 5873 u32 roc_barrier; 5874 bool roc; 5875 } lr; 5876 struct nfs_fattr fattr; 5877 int rpc_status; 5878 struct inode *inode; 5879 }; 5880 5881 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5882 { 5883 struct nfs4_delegreturndata *data = calldata; 5884 struct nfs4_exception exception = { 5885 .inode = data->inode, 5886 .stateid = &data->stateid, 5887 }; 5888 5889 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5890 return; 5891 5892 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5893 5894 /* Handle Layoutreturn errors */ 5895 if (data->args.lr_args && task->tk_status != 0) { 5896 switch(data->res.lr_ret) { 5897 default: 5898 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5899 break; 5900 case 0: 5901 data->args.lr_args = NULL; 5902 data->res.lr_res = NULL; 5903 break; 5904 case -NFS4ERR_OLD_STATEID: 5905 if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid, 5906 data->inode)) 5907 goto lr_restart; 5908 /* Fallthrough */ 5909 case -NFS4ERR_ADMIN_REVOKED: 5910 case -NFS4ERR_DELEG_REVOKED: 5911 case -NFS4ERR_EXPIRED: 5912 case -NFS4ERR_BAD_STATEID: 5913 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 5914 case -NFS4ERR_WRONG_CRED: 5915 data->args.lr_args = NULL; 5916 data->res.lr_res = NULL; 5917 goto lr_restart; 5918 } 5919 } 5920 5921 switch (task->tk_status) { 5922 case 0: 5923 renew_lease(data->res.server, data->timestamp); 5924 break; 5925 case -NFS4ERR_ADMIN_REVOKED: 5926 case -NFS4ERR_DELEG_REVOKED: 5927 case -NFS4ERR_EXPIRED: 5928 nfs4_free_revoked_stateid(data->res.server, 5929 data->args.stateid, 5930 task->tk_msg.rpc_cred); 5931 /* Fallthrough */ 5932 case -NFS4ERR_BAD_STATEID: 5933 case -NFS4ERR_STALE_STATEID: 5934 task->tk_status = 0; 5935 break; 5936 case -NFS4ERR_OLD_STATEID: 5937 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 5938 goto out_restart; 5939 task->tk_status = 0; 5940 break; 5941 case -NFS4ERR_ACCESS: 5942 if (data->args.bitmask) { 5943 data->args.bitmask = NULL; 5944 data->res.fattr = NULL; 5945 goto out_restart; 5946 } 5947 /* Fallthrough */ 5948 default: 5949 task->tk_status = nfs4_async_handle_exception(task, 5950 data->res.server, task->tk_status, 5951 &exception); 5952 if (exception.retry) 5953 goto out_restart; 5954 } 5955 data->rpc_status = task->tk_status; 5956 return; 5957 lr_restart: 5958 data->res.lr_ret = 0; 5959 out_restart: 5960 task->tk_status = 0; 5961 rpc_restart_call_prepare(task); 5962 } 5963 5964 static void nfs4_delegreturn_release(void *calldata) 5965 { 5966 struct nfs4_delegreturndata *data = calldata; 5967 struct inode *inode = data->inode; 5968 5969 if (inode) { 5970 if (data->lr.roc) 5971 pnfs_roc_release(&data->lr.arg, &data->lr.res, 5972 data->res.lr_ret); 5973 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5974 nfs_iput_and_deactive(inode); 5975 } 5976 kfree(calldata); 5977 } 5978 5979 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5980 { 5981 struct nfs4_delegreturndata *d_data; 5982 struct pnfs_layout_hdr *lo; 5983 5984 d_data = (struct nfs4_delegreturndata *)data; 5985 5986 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) 5987 return; 5988 5989 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 5990 if (lo && !pnfs_layout_is_valid(lo)) { 5991 d_data->args.lr_args = NULL; 5992 d_data->res.lr_res = NULL; 5993 } 5994 5995 nfs4_setup_sequence(d_data->res.server->nfs_client, 5996 &d_data->args.seq_args, 5997 &d_data->res.seq_res, 5998 task); 5999 } 6000 6001 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6002 .rpc_call_prepare = nfs4_delegreturn_prepare, 6003 .rpc_call_done = nfs4_delegreturn_done, 6004 .rpc_release = nfs4_delegreturn_release, 6005 }; 6006 6007 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 6008 { 6009 struct nfs4_delegreturndata *data; 6010 struct nfs_server *server = NFS_SERVER(inode); 6011 struct rpc_task *task; 6012 struct rpc_message msg = { 6013 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6014 .rpc_cred = cred, 6015 }; 6016 struct rpc_task_setup task_setup_data = { 6017 .rpc_client = server->client, 6018 .rpc_message = &msg, 6019 .callback_ops = &nfs4_delegreturn_ops, 6020 .flags = RPC_TASK_ASYNC, 6021 }; 6022 int status = 0; 6023 6024 data = kzalloc(sizeof(*data), GFP_NOFS); 6025 if (data == NULL) 6026 return -ENOMEM; 6027 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 6028 6029 nfs4_state_protect(server->nfs_client, 6030 NFS_SP4_MACH_CRED_CLEANUP, 6031 &task_setup_data.rpc_client, &msg); 6032 6033 data->args.fhandle = &data->fh; 6034 data->args.stateid = &data->stateid; 6035 data->args.bitmask = server->cache_consistency_bitmask; 6036 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6037 nfs4_stateid_copy(&data->stateid, stateid); 6038 data->res.fattr = &data->fattr; 6039 data->res.server = server; 6040 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6041 data->lr.arg.ld_private = &data->lr.ld_private; 6042 nfs_fattr_init(data->res.fattr); 6043 data->timestamp = jiffies; 6044 data->rpc_status = 0; 6045 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred); 6046 data->inode = nfs_igrab_and_active(inode); 6047 if (data->inode) { 6048 if (data->lr.roc) { 6049 data->args.lr_args = &data->lr.arg; 6050 data->res.lr_res = &data->lr.res; 6051 } 6052 } else if (data->lr.roc) { 6053 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0); 6054 data->lr.roc = false; 6055 } 6056 6057 task_setup_data.callback_data = data; 6058 msg.rpc_argp = &data->args; 6059 msg.rpc_resp = &data->res; 6060 task = rpc_run_task(&task_setup_data); 6061 if (IS_ERR(task)) 6062 return PTR_ERR(task); 6063 if (!issync) 6064 goto out; 6065 status = rpc_wait_for_completion_task(task); 6066 if (status != 0) 6067 goto out; 6068 status = data->rpc_status; 6069 out: 6070 rpc_put_task(task); 6071 return status; 6072 } 6073 6074 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 6075 { 6076 struct nfs_server *server = NFS_SERVER(inode); 6077 struct nfs4_exception exception = { }; 6078 int err; 6079 do { 6080 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6081 trace_nfs4_delegreturn(inode, stateid, err); 6082 switch (err) { 6083 case -NFS4ERR_STALE_STATEID: 6084 case -NFS4ERR_EXPIRED: 6085 case 0: 6086 return 0; 6087 } 6088 err = nfs4_handle_exception(server, err, &exception); 6089 } while (exception.retry); 6090 return err; 6091 } 6092 6093 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6094 { 6095 struct inode *inode = state->inode; 6096 struct nfs_server *server = NFS_SERVER(inode); 6097 struct nfs_client *clp = server->nfs_client; 6098 struct nfs_lockt_args arg = { 6099 .fh = NFS_FH(inode), 6100 .fl = request, 6101 }; 6102 struct nfs_lockt_res res = { 6103 .denied = request, 6104 }; 6105 struct rpc_message msg = { 6106 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6107 .rpc_argp = &arg, 6108 .rpc_resp = &res, 6109 .rpc_cred = state->owner->so_cred, 6110 }; 6111 struct nfs4_lock_state *lsp; 6112 int status; 6113 6114 arg.lock_owner.clientid = clp->cl_clientid; 6115 status = nfs4_set_lock_state(state, request); 6116 if (status != 0) 6117 goto out; 6118 lsp = request->fl_u.nfs4_fl.owner; 6119 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6120 arg.lock_owner.s_dev = server->s_dev; 6121 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6122 switch (status) { 6123 case 0: 6124 request->fl_type = F_UNLCK; 6125 break; 6126 case -NFS4ERR_DENIED: 6127 status = 0; 6128 } 6129 request->fl_ops->fl_release_private(request); 6130 request->fl_ops = NULL; 6131 out: 6132 return status; 6133 } 6134 6135 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6136 { 6137 struct nfs4_exception exception = { }; 6138 int err; 6139 6140 do { 6141 err = _nfs4_proc_getlk(state, cmd, request); 6142 trace_nfs4_get_lock(request, state, cmd, err); 6143 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6144 &exception); 6145 } while (exception.retry); 6146 return err; 6147 } 6148 6149 struct nfs4_unlockdata { 6150 struct nfs_locku_args arg; 6151 struct nfs_locku_res res; 6152 struct nfs4_lock_state *lsp; 6153 struct nfs_open_context *ctx; 6154 struct nfs_lock_context *l_ctx; 6155 struct file_lock fl; 6156 struct nfs_server *server; 6157 unsigned long timestamp; 6158 }; 6159 6160 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6161 struct nfs_open_context *ctx, 6162 struct nfs4_lock_state *lsp, 6163 struct nfs_seqid *seqid) 6164 { 6165 struct nfs4_unlockdata *p; 6166 struct inode *inode = lsp->ls_state->inode; 6167 6168 p = kzalloc(sizeof(*p), GFP_NOFS); 6169 if (p == NULL) 6170 return NULL; 6171 p->arg.fh = NFS_FH(inode); 6172 p->arg.fl = &p->fl; 6173 p->arg.seqid = seqid; 6174 p->res.seqid = seqid; 6175 p->lsp = lsp; 6176 refcount_inc(&lsp->ls_count); 6177 /* Ensure we don't close file until we're done freeing locks! */ 6178 p->ctx = get_nfs_open_context(ctx); 6179 p->l_ctx = nfs_get_lock_context(ctx); 6180 memcpy(&p->fl, fl, sizeof(p->fl)); 6181 p->server = NFS_SERVER(inode); 6182 return p; 6183 } 6184 6185 static void nfs4_locku_release_calldata(void *data) 6186 { 6187 struct nfs4_unlockdata *calldata = data; 6188 nfs_free_seqid(calldata->arg.seqid); 6189 nfs4_put_lock_state(calldata->lsp); 6190 nfs_put_lock_context(calldata->l_ctx); 6191 put_nfs_open_context(calldata->ctx); 6192 kfree(calldata); 6193 } 6194 6195 static void nfs4_locku_done(struct rpc_task *task, void *data) 6196 { 6197 struct nfs4_unlockdata *calldata = data; 6198 struct nfs4_exception exception = { 6199 .inode = calldata->lsp->ls_state->inode, 6200 .stateid = &calldata->arg.stateid, 6201 }; 6202 6203 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6204 return; 6205 switch (task->tk_status) { 6206 case 0: 6207 renew_lease(calldata->server, calldata->timestamp); 6208 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6209 if (nfs4_update_lock_stateid(calldata->lsp, 6210 &calldata->res.stateid)) 6211 break; 6212 case -NFS4ERR_ADMIN_REVOKED: 6213 case -NFS4ERR_EXPIRED: 6214 nfs4_free_revoked_stateid(calldata->server, 6215 &calldata->arg.stateid, 6216 task->tk_msg.rpc_cred); 6217 case -NFS4ERR_BAD_STATEID: 6218 case -NFS4ERR_OLD_STATEID: 6219 case -NFS4ERR_STALE_STATEID: 6220 if (!nfs4_stateid_match(&calldata->arg.stateid, 6221 &calldata->lsp->ls_stateid)) 6222 rpc_restart_call_prepare(task); 6223 break; 6224 default: 6225 task->tk_status = nfs4_async_handle_exception(task, 6226 calldata->server, task->tk_status, 6227 &exception); 6228 if (exception.retry) 6229 rpc_restart_call_prepare(task); 6230 } 6231 nfs_release_seqid(calldata->arg.seqid); 6232 } 6233 6234 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6235 { 6236 struct nfs4_unlockdata *calldata = data; 6237 6238 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6239 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6240 return; 6241 6242 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6243 goto out_wait; 6244 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid); 6245 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6246 /* Note: exit _without_ running nfs4_locku_done */ 6247 goto out_no_action; 6248 } 6249 calldata->timestamp = jiffies; 6250 if (nfs4_setup_sequence(calldata->server->nfs_client, 6251 &calldata->arg.seq_args, 6252 &calldata->res.seq_res, 6253 task) != 0) 6254 nfs_release_seqid(calldata->arg.seqid); 6255 return; 6256 out_no_action: 6257 task->tk_action = NULL; 6258 out_wait: 6259 nfs4_sequence_done(task, &calldata->res.seq_res); 6260 } 6261 6262 static const struct rpc_call_ops nfs4_locku_ops = { 6263 .rpc_call_prepare = nfs4_locku_prepare, 6264 .rpc_call_done = nfs4_locku_done, 6265 .rpc_release = nfs4_locku_release_calldata, 6266 }; 6267 6268 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6269 struct nfs_open_context *ctx, 6270 struct nfs4_lock_state *lsp, 6271 struct nfs_seqid *seqid) 6272 { 6273 struct nfs4_unlockdata *data; 6274 struct rpc_message msg = { 6275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6276 .rpc_cred = ctx->cred, 6277 }; 6278 struct rpc_task_setup task_setup_data = { 6279 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6280 .rpc_message = &msg, 6281 .callback_ops = &nfs4_locku_ops, 6282 .workqueue = nfsiod_workqueue, 6283 .flags = RPC_TASK_ASYNC, 6284 }; 6285 6286 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6287 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6288 6289 /* Ensure this is an unlock - when canceling a lock, the 6290 * canceled lock is passed in, and it won't be an unlock. 6291 */ 6292 fl->fl_type = F_UNLCK; 6293 if (fl->fl_flags & FL_CLOSE) 6294 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6295 6296 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6297 if (data == NULL) { 6298 nfs_free_seqid(seqid); 6299 return ERR_PTR(-ENOMEM); 6300 } 6301 6302 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6303 msg.rpc_argp = &data->arg; 6304 msg.rpc_resp = &data->res; 6305 task_setup_data.callback_data = data; 6306 return rpc_run_task(&task_setup_data); 6307 } 6308 6309 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6310 { 6311 struct inode *inode = state->inode; 6312 struct nfs4_state_owner *sp = state->owner; 6313 struct nfs_inode *nfsi = NFS_I(inode); 6314 struct nfs_seqid *seqid; 6315 struct nfs4_lock_state *lsp; 6316 struct rpc_task *task; 6317 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6318 int status = 0; 6319 unsigned char fl_flags = request->fl_flags; 6320 6321 status = nfs4_set_lock_state(state, request); 6322 /* Unlock _before_ we do the RPC call */ 6323 request->fl_flags |= FL_EXISTS; 6324 /* Exclude nfs_delegation_claim_locks() */ 6325 mutex_lock(&sp->so_delegreturn_mutex); 6326 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 6327 down_read(&nfsi->rwsem); 6328 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 6329 up_read(&nfsi->rwsem); 6330 mutex_unlock(&sp->so_delegreturn_mutex); 6331 goto out; 6332 } 6333 up_read(&nfsi->rwsem); 6334 mutex_unlock(&sp->so_delegreturn_mutex); 6335 if (status != 0) 6336 goto out; 6337 /* Is this a delegated lock? */ 6338 lsp = request->fl_u.nfs4_fl.owner; 6339 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 6340 goto out; 6341 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 6342 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 6343 status = -ENOMEM; 6344 if (IS_ERR(seqid)) 6345 goto out; 6346 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 6347 status = PTR_ERR(task); 6348 if (IS_ERR(task)) 6349 goto out; 6350 status = rpc_wait_for_completion_task(task); 6351 rpc_put_task(task); 6352 out: 6353 request->fl_flags = fl_flags; 6354 trace_nfs4_unlock(request, state, F_SETLK, status); 6355 return status; 6356 } 6357 6358 struct nfs4_lockdata { 6359 struct nfs_lock_args arg; 6360 struct nfs_lock_res res; 6361 struct nfs4_lock_state *lsp; 6362 struct nfs_open_context *ctx; 6363 struct file_lock fl; 6364 unsigned long timestamp; 6365 int rpc_status; 6366 int cancelled; 6367 struct nfs_server *server; 6368 }; 6369 6370 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 6371 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 6372 gfp_t gfp_mask) 6373 { 6374 struct nfs4_lockdata *p; 6375 struct inode *inode = lsp->ls_state->inode; 6376 struct nfs_server *server = NFS_SERVER(inode); 6377 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6378 6379 p = kzalloc(sizeof(*p), gfp_mask); 6380 if (p == NULL) 6381 return NULL; 6382 6383 p->arg.fh = NFS_FH(inode); 6384 p->arg.fl = &p->fl; 6385 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 6386 if (IS_ERR(p->arg.open_seqid)) 6387 goto out_free; 6388 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 6389 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 6390 if (IS_ERR(p->arg.lock_seqid)) 6391 goto out_free_seqid; 6392 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 6393 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 6394 p->arg.lock_owner.s_dev = server->s_dev; 6395 p->res.lock_seqid = p->arg.lock_seqid; 6396 p->lsp = lsp; 6397 p->server = server; 6398 refcount_inc(&lsp->ls_count); 6399 p->ctx = get_nfs_open_context(ctx); 6400 memcpy(&p->fl, fl, sizeof(p->fl)); 6401 return p; 6402 out_free_seqid: 6403 nfs_free_seqid(p->arg.open_seqid); 6404 out_free: 6405 kfree(p); 6406 return NULL; 6407 } 6408 6409 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 6410 { 6411 struct nfs4_lockdata *data = calldata; 6412 struct nfs4_state *state = data->lsp->ls_state; 6413 6414 dprintk("%s: begin!\n", __func__); 6415 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 6416 goto out_wait; 6417 /* Do we need to do an open_to_lock_owner? */ 6418 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 6419 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 6420 goto out_release_lock_seqid; 6421 } 6422 nfs4_stateid_copy(&data->arg.open_stateid, 6423 &state->open_stateid); 6424 data->arg.new_lock_owner = 1; 6425 data->res.open_seqid = data->arg.open_seqid; 6426 } else { 6427 data->arg.new_lock_owner = 0; 6428 nfs4_stateid_copy(&data->arg.lock_stateid, 6429 &data->lsp->ls_stateid); 6430 } 6431 if (!nfs4_valid_open_stateid(state)) { 6432 data->rpc_status = -EBADF; 6433 task->tk_action = NULL; 6434 goto out_release_open_seqid; 6435 } 6436 data->timestamp = jiffies; 6437 if (nfs4_setup_sequence(data->server->nfs_client, 6438 &data->arg.seq_args, 6439 &data->res.seq_res, 6440 task) == 0) 6441 return; 6442 out_release_open_seqid: 6443 nfs_release_seqid(data->arg.open_seqid); 6444 out_release_lock_seqid: 6445 nfs_release_seqid(data->arg.lock_seqid); 6446 out_wait: 6447 nfs4_sequence_done(task, &data->res.seq_res); 6448 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 6449 } 6450 6451 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 6452 { 6453 struct nfs4_lockdata *data = calldata; 6454 struct nfs4_lock_state *lsp = data->lsp; 6455 6456 dprintk("%s: begin!\n", __func__); 6457 6458 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6459 return; 6460 6461 data->rpc_status = task->tk_status; 6462 switch (task->tk_status) { 6463 case 0: 6464 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 6465 data->timestamp); 6466 if (data->arg.new_lock && !data->cancelled) { 6467 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 6468 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 6469 break; 6470 } 6471 6472 if (data->arg.new_lock_owner != 0) { 6473 nfs_confirm_seqid(&lsp->ls_seqid, 0); 6474 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 6475 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6476 goto out_done; 6477 } else if (nfs4_update_lock_stateid(lsp, &data->res.stateid)) 6478 goto out_done; 6479 6480 break; 6481 case -NFS4ERR_BAD_STATEID: 6482 case -NFS4ERR_OLD_STATEID: 6483 case -NFS4ERR_STALE_STATEID: 6484 case -NFS4ERR_EXPIRED: 6485 if (data->arg.new_lock_owner != 0) { 6486 if (nfs4_stateid_match(&data->arg.open_stateid, 6487 &lsp->ls_state->open_stateid)) 6488 goto out_done; 6489 } else if (nfs4_stateid_match(&data->arg.lock_stateid, 6490 &lsp->ls_stateid)) 6491 goto out_done; 6492 } 6493 if (!data->cancelled) 6494 rpc_restart_call_prepare(task); 6495 out_done: 6496 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 6497 } 6498 6499 static void nfs4_lock_release(void *calldata) 6500 { 6501 struct nfs4_lockdata *data = calldata; 6502 6503 dprintk("%s: begin!\n", __func__); 6504 nfs_free_seqid(data->arg.open_seqid); 6505 if (data->cancelled) { 6506 struct rpc_task *task; 6507 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 6508 data->arg.lock_seqid); 6509 if (!IS_ERR(task)) 6510 rpc_put_task_async(task); 6511 dprintk("%s: cancelling lock!\n", __func__); 6512 } else 6513 nfs_free_seqid(data->arg.lock_seqid); 6514 nfs4_put_lock_state(data->lsp); 6515 put_nfs_open_context(data->ctx); 6516 kfree(data); 6517 dprintk("%s: done!\n", __func__); 6518 } 6519 6520 static const struct rpc_call_ops nfs4_lock_ops = { 6521 .rpc_call_prepare = nfs4_lock_prepare, 6522 .rpc_call_done = nfs4_lock_done, 6523 .rpc_release = nfs4_lock_release, 6524 }; 6525 6526 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 6527 { 6528 switch (error) { 6529 case -NFS4ERR_ADMIN_REVOKED: 6530 case -NFS4ERR_EXPIRED: 6531 case -NFS4ERR_BAD_STATEID: 6532 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6533 if (new_lock_owner != 0 || 6534 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 6535 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 6536 break; 6537 case -NFS4ERR_STALE_STATEID: 6538 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6539 nfs4_schedule_lease_recovery(server->nfs_client); 6540 }; 6541 } 6542 6543 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 6544 { 6545 struct nfs4_lockdata *data; 6546 struct rpc_task *task; 6547 struct rpc_message msg = { 6548 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 6549 .rpc_cred = state->owner->so_cred, 6550 }; 6551 struct rpc_task_setup task_setup_data = { 6552 .rpc_client = NFS_CLIENT(state->inode), 6553 .rpc_message = &msg, 6554 .callback_ops = &nfs4_lock_ops, 6555 .workqueue = nfsiod_workqueue, 6556 .flags = RPC_TASK_ASYNC, 6557 }; 6558 int ret; 6559 6560 dprintk("%s: begin!\n", __func__); 6561 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 6562 fl->fl_u.nfs4_fl.owner, 6563 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 6564 if (data == NULL) 6565 return -ENOMEM; 6566 if (IS_SETLKW(cmd)) 6567 data->arg.block = 1; 6568 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 6569 recovery_type > NFS_LOCK_NEW); 6570 msg.rpc_argp = &data->arg; 6571 msg.rpc_resp = &data->res; 6572 task_setup_data.callback_data = data; 6573 if (recovery_type > NFS_LOCK_NEW) { 6574 if (recovery_type == NFS_LOCK_RECLAIM) 6575 data->arg.reclaim = NFS_LOCK_RECLAIM; 6576 } else 6577 data->arg.new_lock = 1; 6578 task = rpc_run_task(&task_setup_data); 6579 if (IS_ERR(task)) 6580 return PTR_ERR(task); 6581 ret = rpc_wait_for_completion_task(task); 6582 if (ret == 0) { 6583 ret = data->rpc_status; 6584 if (ret) 6585 nfs4_handle_setlk_error(data->server, data->lsp, 6586 data->arg.new_lock_owner, ret); 6587 } else 6588 data->cancelled = true; 6589 rpc_put_task(task); 6590 dprintk("%s: done, ret = %d!\n", __func__, ret); 6591 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 6592 return ret; 6593 } 6594 6595 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 6596 { 6597 struct nfs_server *server = NFS_SERVER(state->inode); 6598 struct nfs4_exception exception = { 6599 .inode = state->inode, 6600 }; 6601 int err; 6602 6603 do { 6604 /* Cache the lock if possible... */ 6605 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6606 return 0; 6607 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 6608 if (err != -NFS4ERR_DELAY) 6609 break; 6610 nfs4_handle_exception(server, err, &exception); 6611 } while (exception.retry); 6612 return err; 6613 } 6614 6615 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 6616 { 6617 struct nfs_server *server = NFS_SERVER(state->inode); 6618 struct nfs4_exception exception = { 6619 .inode = state->inode, 6620 }; 6621 int err; 6622 6623 err = nfs4_set_lock_state(state, request); 6624 if (err != 0) 6625 return err; 6626 if (!recover_lost_locks) { 6627 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 6628 return 0; 6629 } 6630 do { 6631 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6632 return 0; 6633 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 6634 switch (err) { 6635 default: 6636 goto out; 6637 case -NFS4ERR_GRACE: 6638 case -NFS4ERR_DELAY: 6639 nfs4_handle_exception(server, err, &exception); 6640 err = 0; 6641 } 6642 } while (exception.retry); 6643 out: 6644 return err; 6645 } 6646 6647 #if defined(CONFIG_NFS_V4_1) 6648 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 6649 { 6650 struct nfs4_lock_state *lsp; 6651 int status; 6652 6653 status = nfs4_set_lock_state(state, request); 6654 if (status != 0) 6655 return status; 6656 lsp = request->fl_u.nfs4_fl.owner; 6657 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 6658 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 6659 return 0; 6660 return nfs4_lock_expired(state, request); 6661 } 6662 #endif 6663 6664 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6665 { 6666 struct nfs_inode *nfsi = NFS_I(state->inode); 6667 struct nfs4_state_owner *sp = state->owner; 6668 unsigned char fl_flags = request->fl_flags; 6669 int status; 6670 6671 request->fl_flags |= FL_ACCESS; 6672 status = locks_lock_inode_wait(state->inode, request); 6673 if (status < 0) 6674 goto out; 6675 mutex_lock(&sp->so_delegreturn_mutex); 6676 down_read(&nfsi->rwsem); 6677 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 6678 /* Yes: cache locks! */ 6679 /* ...but avoid races with delegation recall... */ 6680 request->fl_flags = fl_flags & ~FL_SLEEP; 6681 status = locks_lock_inode_wait(state->inode, request); 6682 up_read(&nfsi->rwsem); 6683 mutex_unlock(&sp->so_delegreturn_mutex); 6684 goto out; 6685 } 6686 up_read(&nfsi->rwsem); 6687 mutex_unlock(&sp->so_delegreturn_mutex); 6688 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 6689 out: 6690 request->fl_flags = fl_flags; 6691 return status; 6692 } 6693 6694 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6695 { 6696 struct nfs4_exception exception = { 6697 .state = state, 6698 .inode = state->inode, 6699 }; 6700 int err; 6701 6702 do { 6703 err = _nfs4_proc_setlk(state, cmd, request); 6704 if (err == -NFS4ERR_DENIED) 6705 err = -EAGAIN; 6706 err = nfs4_handle_exception(NFS_SERVER(state->inode), 6707 err, &exception); 6708 } while (exception.retry); 6709 return err; 6710 } 6711 6712 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 6713 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 6714 6715 static int 6716 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 6717 struct file_lock *request) 6718 { 6719 int status = -ERESTARTSYS; 6720 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 6721 6722 while(!signalled()) { 6723 status = nfs4_proc_setlk(state, cmd, request); 6724 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6725 break; 6726 freezable_schedule_timeout_interruptible(timeout); 6727 timeout *= 2; 6728 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 6729 status = -ERESTARTSYS; 6730 } 6731 return status; 6732 } 6733 6734 #ifdef CONFIG_NFS_V4_1 6735 struct nfs4_lock_waiter { 6736 struct task_struct *task; 6737 struct inode *inode; 6738 struct nfs_lowner *owner; 6739 bool notified; 6740 }; 6741 6742 static int 6743 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 6744 { 6745 int ret; 6746 struct nfs4_lock_waiter *waiter = wait->private; 6747 6748 /* NULL key means to wake up everyone */ 6749 if (key) { 6750 struct cb_notify_lock_args *cbnl = key; 6751 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 6752 *wowner = waiter->owner; 6753 6754 /* Only wake if the callback was for the same owner. */ 6755 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 6756 return 0; 6757 6758 /* Make sure it's for the right inode */ 6759 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 6760 return 0; 6761 6762 waiter->notified = true; 6763 } 6764 6765 /* override "private" so we can use default_wake_function */ 6766 wait->private = waiter->task; 6767 ret = autoremove_wake_function(wait, mode, flags, key); 6768 wait->private = waiter; 6769 return ret; 6770 } 6771 6772 static int 6773 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6774 { 6775 int status = -ERESTARTSYS; 6776 unsigned long flags; 6777 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 6778 struct nfs_server *server = NFS_SERVER(state->inode); 6779 struct nfs_client *clp = server->nfs_client; 6780 wait_queue_head_t *q = &clp->cl_lock_waitq; 6781 struct nfs_lowner owner = { .clientid = clp->cl_clientid, 6782 .id = lsp->ls_seqid.owner_id, 6783 .s_dev = server->s_dev }; 6784 struct nfs4_lock_waiter waiter = { .task = current, 6785 .inode = state->inode, 6786 .owner = &owner, 6787 .notified = false }; 6788 wait_queue_entry_t wait; 6789 6790 /* Don't bother with waitqueue if we don't expect a callback */ 6791 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 6792 return nfs4_retry_setlk_simple(state, cmd, request); 6793 6794 init_wait(&wait); 6795 wait.private = &waiter; 6796 wait.func = nfs4_wake_lock_waiter; 6797 add_wait_queue(q, &wait); 6798 6799 while(!signalled()) { 6800 waiter.notified = false; 6801 status = nfs4_proc_setlk(state, cmd, request); 6802 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6803 break; 6804 6805 status = -ERESTARTSYS; 6806 spin_lock_irqsave(&q->lock, flags); 6807 if (waiter.notified) { 6808 spin_unlock_irqrestore(&q->lock, flags); 6809 continue; 6810 } 6811 set_current_state(TASK_INTERRUPTIBLE); 6812 spin_unlock_irqrestore(&q->lock, flags); 6813 6814 freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT); 6815 } 6816 6817 finish_wait(q, &wait); 6818 return status; 6819 } 6820 #else /* !CONFIG_NFS_V4_1 */ 6821 static inline int 6822 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6823 { 6824 return nfs4_retry_setlk_simple(state, cmd, request); 6825 } 6826 #endif 6827 6828 static int 6829 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 6830 { 6831 struct nfs_open_context *ctx; 6832 struct nfs4_state *state; 6833 int status; 6834 6835 /* verify open state */ 6836 ctx = nfs_file_open_context(filp); 6837 state = ctx->state; 6838 6839 if (IS_GETLK(cmd)) { 6840 if (state != NULL) 6841 return nfs4_proc_getlk(state, F_GETLK, request); 6842 return 0; 6843 } 6844 6845 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 6846 return -EINVAL; 6847 6848 if (request->fl_type == F_UNLCK) { 6849 if (state != NULL) 6850 return nfs4_proc_unlck(state, cmd, request); 6851 return 0; 6852 } 6853 6854 if (state == NULL) 6855 return -ENOLCK; 6856 6857 if ((request->fl_flags & FL_POSIX) && 6858 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 6859 return -ENOLCK; 6860 6861 /* 6862 * Don't rely on the VFS having checked the file open mode, 6863 * since it won't do this for flock() locks. 6864 */ 6865 switch (request->fl_type) { 6866 case F_RDLCK: 6867 if (!(filp->f_mode & FMODE_READ)) 6868 return -EBADF; 6869 break; 6870 case F_WRLCK: 6871 if (!(filp->f_mode & FMODE_WRITE)) 6872 return -EBADF; 6873 } 6874 6875 status = nfs4_set_lock_state(state, request); 6876 if (status != 0) 6877 return status; 6878 6879 return nfs4_retry_setlk(state, cmd, request); 6880 } 6881 6882 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 6883 { 6884 struct nfs_server *server = NFS_SERVER(state->inode); 6885 int err; 6886 6887 err = nfs4_set_lock_state(state, fl); 6888 if (err != 0) 6889 return err; 6890 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 6891 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 6892 } 6893 6894 struct nfs_release_lockowner_data { 6895 struct nfs4_lock_state *lsp; 6896 struct nfs_server *server; 6897 struct nfs_release_lockowner_args args; 6898 struct nfs_release_lockowner_res res; 6899 unsigned long timestamp; 6900 }; 6901 6902 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 6903 { 6904 struct nfs_release_lockowner_data *data = calldata; 6905 struct nfs_server *server = data->server; 6906 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 6907 &data->res.seq_res, task); 6908 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6909 data->timestamp = jiffies; 6910 } 6911 6912 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 6913 { 6914 struct nfs_release_lockowner_data *data = calldata; 6915 struct nfs_server *server = data->server; 6916 6917 nfs40_sequence_done(task, &data->res.seq_res); 6918 6919 switch (task->tk_status) { 6920 case 0: 6921 renew_lease(server, data->timestamp); 6922 break; 6923 case -NFS4ERR_STALE_CLIENTID: 6924 case -NFS4ERR_EXPIRED: 6925 nfs4_schedule_lease_recovery(server->nfs_client); 6926 break; 6927 case -NFS4ERR_LEASE_MOVED: 6928 case -NFS4ERR_DELAY: 6929 if (nfs4_async_handle_error(task, server, 6930 NULL, NULL) == -EAGAIN) 6931 rpc_restart_call_prepare(task); 6932 } 6933 } 6934 6935 static void nfs4_release_lockowner_release(void *calldata) 6936 { 6937 struct nfs_release_lockowner_data *data = calldata; 6938 nfs4_free_lock_state(data->server, data->lsp); 6939 kfree(calldata); 6940 } 6941 6942 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6943 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6944 .rpc_call_done = nfs4_release_lockowner_done, 6945 .rpc_release = nfs4_release_lockowner_release, 6946 }; 6947 6948 static void 6949 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6950 { 6951 struct nfs_release_lockowner_data *data; 6952 struct rpc_message msg = { 6953 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6954 }; 6955 6956 if (server->nfs_client->cl_mvops->minor_version != 0) 6957 return; 6958 6959 data = kmalloc(sizeof(*data), GFP_NOFS); 6960 if (!data) 6961 return; 6962 data->lsp = lsp; 6963 data->server = server; 6964 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6965 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6966 data->args.lock_owner.s_dev = server->s_dev; 6967 6968 msg.rpc_argp = &data->args; 6969 msg.rpc_resp = &data->res; 6970 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 6971 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6972 } 6973 6974 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6975 6976 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 6977 struct dentry *unused, struct inode *inode, 6978 const char *key, const void *buf, 6979 size_t buflen, int flags) 6980 { 6981 return nfs4_proc_set_acl(inode, buf, buflen); 6982 } 6983 6984 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 6985 struct dentry *unused, struct inode *inode, 6986 const char *key, void *buf, size_t buflen) 6987 { 6988 return nfs4_proc_get_acl(inode, buf, buflen); 6989 } 6990 6991 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 6992 { 6993 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 6994 } 6995 6996 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6997 6998 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 6999 struct dentry *unused, struct inode *inode, 7000 const char *key, const void *buf, 7001 size_t buflen, int flags) 7002 { 7003 if (security_ismaclabel(key)) 7004 return nfs4_set_security_label(inode, buf, buflen); 7005 7006 return -EOPNOTSUPP; 7007 } 7008 7009 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7010 struct dentry *unused, struct inode *inode, 7011 const char *key, void *buf, size_t buflen) 7012 { 7013 if (security_ismaclabel(key)) 7014 return nfs4_get_security_label(inode, buf, buflen); 7015 return -EOPNOTSUPP; 7016 } 7017 7018 static ssize_t 7019 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7020 { 7021 int len = 0; 7022 7023 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7024 len = security_inode_listsecurity(inode, list, list_len); 7025 if (list_len && len > list_len) 7026 return -ERANGE; 7027 } 7028 return len; 7029 } 7030 7031 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7032 .prefix = XATTR_SECURITY_PREFIX, 7033 .get = nfs4_xattr_get_nfs4_label, 7034 .set = nfs4_xattr_set_nfs4_label, 7035 }; 7036 7037 #else 7038 7039 static ssize_t 7040 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7041 { 7042 return 0; 7043 } 7044 7045 #endif 7046 7047 /* 7048 * nfs_fhget will use either the mounted_on_fileid or the fileid 7049 */ 7050 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7051 { 7052 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7053 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7054 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7055 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7056 return; 7057 7058 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7059 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7060 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7061 fattr->nlink = 2; 7062 } 7063 7064 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7065 const struct qstr *name, 7066 struct nfs4_fs_locations *fs_locations, 7067 struct page *page) 7068 { 7069 struct nfs_server *server = NFS_SERVER(dir); 7070 u32 bitmask[3]; 7071 struct nfs4_fs_locations_arg args = { 7072 .dir_fh = NFS_FH(dir), 7073 .name = name, 7074 .page = page, 7075 .bitmask = bitmask, 7076 }; 7077 struct nfs4_fs_locations_res res = { 7078 .fs_locations = fs_locations, 7079 }; 7080 struct rpc_message msg = { 7081 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7082 .rpc_argp = &args, 7083 .rpc_resp = &res, 7084 }; 7085 int status; 7086 7087 dprintk("%s: start\n", __func__); 7088 7089 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7090 bitmask[1] = nfs4_fattr_bitmap[1]; 7091 7092 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7093 * is not supported */ 7094 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7095 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7096 else 7097 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7098 7099 nfs_fattr_init(&fs_locations->fattr); 7100 fs_locations->server = server; 7101 fs_locations->nlocations = 0; 7102 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7103 dprintk("%s: returned status = %d\n", __func__, status); 7104 return status; 7105 } 7106 7107 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7108 const struct qstr *name, 7109 struct nfs4_fs_locations *fs_locations, 7110 struct page *page) 7111 { 7112 struct nfs4_exception exception = { }; 7113 int err; 7114 do { 7115 err = _nfs4_proc_fs_locations(client, dir, name, 7116 fs_locations, page); 7117 trace_nfs4_get_fs_locations(dir, name, err); 7118 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7119 &exception); 7120 } while (exception.retry); 7121 return err; 7122 } 7123 7124 /* 7125 * This operation also signals the server that this client is 7126 * performing migration recovery. The server can stop returning 7127 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 7128 * appended to this compound to identify the client ID which is 7129 * performing recovery. 7130 */ 7131 static int _nfs40_proc_get_locations(struct inode *inode, 7132 struct nfs4_fs_locations *locations, 7133 struct page *page, struct rpc_cred *cred) 7134 { 7135 struct nfs_server *server = NFS_SERVER(inode); 7136 struct rpc_clnt *clnt = server->client; 7137 u32 bitmask[2] = { 7138 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7139 }; 7140 struct nfs4_fs_locations_arg args = { 7141 .clientid = server->nfs_client->cl_clientid, 7142 .fh = NFS_FH(inode), 7143 .page = page, 7144 .bitmask = bitmask, 7145 .migration = 1, /* skip LOOKUP */ 7146 .renew = 1, /* append RENEW */ 7147 }; 7148 struct nfs4_fs_locations_res res = { 7149 .fs_locations = locations, 7150 .migration = 1, 7151 .renew = 1, 7152 }; 7153 struct rpc_message msg = { 7154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7155 .rpc_argp = &args, 7156 .rpc_resp = &res, 7157 .rpc_cred = cred, 7158 }; 7159 unsigned long now = jiffies; 7160 int status; 7161 7162 nfs_fattr_init(&locations->fattr); 7163 locations->server = server; 7164 locations->nlocations = 0; 7165 7166 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7167 status = nfs4_call_sync_sequence(clnt, server, &msg, 7168 &args.seq_args, &res.seq_res); 7169 if (status) 7170 return status; 7171 7172 renew_lease(server, now); 7173 return 0; 7174 } 7175 7176 #ifdef CONFIG_NFS_V4_1 7177 7178 /* 7179 * This operation also signals the server that this client is 7180 * performing migration recovery. The server can stop asserting 7181 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 7182 * performing this operation is identified in the SEQUENCE 7183 * operation in this compound. 7184 * 7185 * When the client supports GETATTR(fs_locations_info), it can 7186 * be plumbed in here. 7187 */ 7188 static int _nfs41_proc_get_locations(struct inode *inode, 7189 struct nfs4_fs_locations *locations, 7190 struct page *page, struct rpc_cred *cred) 7191 { 7192 struct nfs_server *server = NFS_SERVER(inode); 7193 struct rpc_clnt *clnt = server->client; 7194 u32 bitmask[2] = { 7195 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7196 }; 7197 struct nfs4_fs_locations_arg args = { 7198 .fh = NFS_FH(inode), 7199 .page = page, 7200 .bitmask = bitmask, 7201 .migration = 1, /* skip LOOKUP */ 7202 }; 7203 struct nfs4_fs_locations_res res = { 7204 .fs_locations = locations, 7205 .migration = 1, 7206 }; 7207 struct rpc_message msg = { 7208 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7209 .rpc_argp = &args, 7210 .rpc_resp = &res, 7211 .rpc_cred = cred, 7212 }; 7213 int status; 7214 7215 nfs_fattr_init(&locations->fattr); 7216 locations->server = server; 7217 locations->nlocations = 0; 7218 7219 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7220 status = nfs4_call_sync_sequence(clnt, server, &msg, 7221 &args.seq_args, &res.seq_res); 7222 if (status == NFS4_OK && 7223 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7224 status = -NFS4ERR_LEASE_MOVED; 7225 return status; 7226 } 7227 7228 #endif /* CONFIG_NFS_V4_1 */ 7229 7230 /** 7231 * nfs4_proc_get_locations - discover locations for a migrated FSID 7232 * @inode: inode on FSID that is migrating 7233 * @locations: result of query 7234 * @page: buffer 7235 * @cred: credential to use for this operation 7236 * 7237 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 7238 * operation failed, or a negative errno if a local error occurred. 7239 * 7240 * On success, "locations" is filled in, but if the server has 7241 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 7242 * asserted. 7243 * 7244 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 7245 * from this client that require migration recovery. 7246 */ 7247 int nfs4_proc_get_locations(struct inode *inode, 7248 struct nfs4_fs_locations *locations, 7249 struct page *page, struct rpc_cred *cred) 7250 { 7251 struct nfs_server *server = NFS_SERVER(inode); 7252 struct nfs_client *clp = server->nfs_client; 7253 const struct nfs4_mig_recovery_ops *ops = 7254 clp->cl_mvops->mig_recovery_ops; 7255 struct nfs4_exception exception = { }; 7256 int status; 7257 7258 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7259 (unsigned long long)server->fsid.major, 7260 (unsigned long long)server->fsid.minor, 7261 clp->cl_hostname); 7262 nfs_display_fhandle(NFS_FH(inode), __func__); 7263 7264 do { 7265 status = ops->get_locations(inode, locations, page, cred); 7266 if (status != -NFS4ERR_DELAY) 7267 break; 7268 nfs4_handle_exception(server, status, &exception); 7269 } while (exception.retry); 7270 return status; 7271 } 7272 7273 /* 7274 * This operation also signals the server that this client is 7275 * performing "lease moved" recovery. The server can stop 7276 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 7277 * is appended to this compound to identify the client ID which is 7278 * performing recovery. 7279 */ 7280 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7281 { 7282 struct nfs_server *server = NFS_SERVER(inode); 7283 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 7284 struct rpc_clnt *clnt = server->client; 7285 struct nfs4_fsid_present_arg args = { 7286 .fh = NFS_FH(inode), 7287 .clientid = clp->cl_clientid, 7288 .renew = 1, /* append RENEW */ 7289 }; 7290 struct nfs4_fsid_present_res res = { 7291 .renew = 1, 7292 }; 7293 struct rpc_message msg = { 7294 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7295 .rpc_argp = &args, 7296 .rpc_resp = &res, 7297 .rpc_cred = cred, 7298 }; 7299 unsigned long now = jiffies; 7300 int status; 7301 7302 res.fh = nfs_alloc_fhandle(); 7303 if (res.fh == NULL) 7304 return -ENOMEM; 7305 7306 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7307 status = nfs4_call_sync_sequence(clnt, server, &msg, 7308 &args.seq_args, &res.seq_res); 7309 nfs_free_fhandle(res.fh); 7310 if (status) 7311 return status; 7312 7313 do_renew_lease(clp, now); 7314 return 0; 7315 } 7316 7317 #ifdef CONFIG_NFS_V4_1 7318 7319 /* 7320 * This operation also signals the server that this client is 7321 * performing "lease moved" recovery. The server can stop asserting 7322 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 7323 * this operation is identified in the SEQUENCE operation in this 7324 * compound. 7325 */ 7326 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7327 { 7328 struct nfs_server *server = NFS_SERVER(inode); 7329 struct rpc_clnt *clnt = server->client; 7330 struct nfs4_fsid_present_arg args = { 7331 .fh = NFS_FH(inode), 7332 }; 7333 struct nfs4_fsid_present_res res = { 7334 }; 7335 struct rpc_message msg = { 7336 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7337 .rpc_argp = &args, 7338 .rpc_resp = &res, 7339 .rpc_cred = cred, 7340 }; 7341 int status; 7342 7343 res.fh = nfs_alloc_fhandle(); 7344 if (res.fh == NULL) 7345 return -ENOMEM; 7346 7347 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7348 status = nfs4_call_sync_sequence(clnt, server, &msg, 7349 &args.seq_args, &res.seq_res); 7350 nfs_free_fhandle(res.fh); 7351 if (status == NFS4_OK && 7352 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7353 status = -NFS4ERR_LEASE_MOVED; 7354 return status; 7355 } 7356 7357 #endif /* CONFIG_NFS_V4_1 */ 7358 7359 /** 7360 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 7361 * @inode: inode on FSID to check 7362 * @cred: credential to use for this operation 7363 * 7364 * Server indicates whether the FSID is present, moved, or not 7365 * recognized. This operation is necessary to clear a LEASE_MOVED 7366 * condition for this client ID. 7367 * 7368 * Returns NFS4_OK if the FSID is present on this server, 7369 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 7370 * NFS4ERR code if some error occurred on the server, or a 7371 * negative errno if a local failure occurred. 7372 */ 7373 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7374 { 7375 struct nfs_server *server = NFS_SERVER(inode); 7376 struct nfs_client *clp = server->nfs_client; 7377 const struct nfs4_mig_recovery_ops *ops = 7378 clp->cl_mvops->mig_recovery_ops; 7379 struct nfs4_exception exception = { }; 7380 int status; 7381 7382 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7383 (unsigned long long)server->fsid.major, 7384 (unsigned long long)server->fsid.minor, 7385 clp->cl_hostname); 7386 nfs_display_fhandle(NFS_FH(inode), __func__); 7387 7388 do { 7389 status = ops->fsid_present(inode, cred); 7390 if (status != -NFS4ERR_DELAY) 7391 break; 7392 nfs4_handle_exception(server, status, &exception); 7393 } while (exception.retry); 7394 return status; 7395 } 7396 7397 /** 7398 * If 'use_integrity' is true and the state managment nfs_client 7399 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 7400 * and the machine credential as per RFC3530bis and RFC5661 Security 7401 * Considerations sections. Otherwise, just use the user cred with the 7402 * filesystem's rpc_client. 7403 */ 7404 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7405 { 7406 int status; 7407 struct nfs4_secinfo_arg args = { 7408 .dir_fh = NFS_FH(dir), 7409 .name = name, 7410 }; 7411 struct nfs4_secinfo_res res = { 7412 .flavors = flavors, 7413 }; 7414 struct rpc_message msg = { 7415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 7416 .rpc_argp = &args, 7417 .rpc_resp = &res, 7418 }; 7419 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 7420 struct rpc_cred *cred = NULL; 7421 7422 if (use_integrity) { 7423 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 7424 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 7425 msg.rpc_cred = cred; 7426 } 7427 7428 dprintk("NFS call secinfo %s\n", name->name); 7429 7430 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 7431 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 7432 7433 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 7434 &res.seq_res, 0); 7435 dprintk("NFS reply secinfo: %d\n", status); 7436 7437 if (cred) 7438 put_rpccred(cred); 7439 7440 return status; 7441 } 7442 7443 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 7444 struct nfs4_secinfo_flavors *flavors) 7445 { 7446 struct nfs4_exception exception = { }; 7447 int err; 7448 do { 7449 err = -NFS4ERR_WRONGSEC; 7450 7451 /* try to use integrity protection with machine cred */ 7452 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 7453 err = _nfs4_proc_secinfo(dir, name, flavors, true); 7454 7455 /* 7456 * if unable to use integrity protection, or SECINFO with 7457 * integrity protection returns NFS4ERR_WRONGSEC (which is 7458 * disallowed by spec, but exists in deployed servers) use 7459 * the current filesystem's rpc_client and the user cred. 7460 */ 7461 if (err == -NFS4ERR_WRONGSEC) 7462 err = _nfs4_proc_secinfo(dir, name, flavors, false); 7463 7464 trace_nfs4_secinfo(dir, name, err); 7465 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7466 &exception); 7467 } while (exception.retry); 7468 return err; 7469 } 7470 7471 #ifdef CONFIG_NFS_V4_1 7472 /* 7473 * Check the exchange flags returned by the server for invalid flags, having 7474 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 7475 * DS flags set. 7476 */ 7477 static int nfs4_check_cl_exchange_flags(u32 flags) 7478 { 7479 if (flags & ~EXCHGID4_FLAG_MASK_R) 7480 goto out_inval; 7481 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 7482 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 7483 goto out_inval; 7484 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 7485 goto out_inval; 7486 return NFS_OK; 7487 out_inval: 7488 return -NFS4ERR_INVAL; 7489 } 7490 7491 static bool 7492 nfs41_same_server_scope(struct nfs41_server_scope *a, 7493 struct nfs41_server_scope *b) 7494 { 7495 if (a->server_scope_sz != b->server_scope_sz) 7496 return false; 7497 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 7498 } 7499 7500 static void 7501 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 7502 { 7503 } 7504 7505 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 7506 .rpc_call_done = &nfs4_bind_one_conn_to_session_done, 7507 }; 7508 7509 /* 7510 * nfs4_proc_bind_one_conn_to_session() 7511 * 7512 * The 4.1 client currently uses the same TCP connection for the 7513 * fore and backchannel. 7514 */ 7515 static 7516 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 7517 struct rpc_xprt *xprt, 7518 struct nfs_client *clp, 7519 struct rpc_cred *cred) 7520 { 7521 int status; 7522 struct nfs41_bind_conn_to_session_args args = { 7523 .client = clp, 7524 .dir = NFS4_CDFC4_FORE_OR_BOTH, 7525 }; 7526 struct nfs41_bind_conn_to_session_res res; 7527 struct rpc_message msg = { 7528 .rpc_proc = 7529 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 7530 .rpc_argp = &args, 7531 .rpc_resp = &res, 7532 .rpc_cred = cred, 7533 }; 7534 struct rpc_task_setup task_setup_data = { 7535 .rpc_client = clnt, 7536 .rpc_xprt = xprt, 7537 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 7538 .rpc_message = &msg, 7539 .flags = RPC_TASK_TIMEOUT, 7540 }; 7541 struct rpc_task *task; 7542 7543 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 7544 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 7545 args.dir = NFS4_CDFC4_FORE; 7546 7547 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 7548 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 7549 args.dir = NFS4_CDFC4_FORE; 7550 7551 task = rpc_run_task(&task_setup_data); 7552 if (!IS_ERR(task)) { 7553 status = task->tk_status; 7554 rpc_put_task(task); 7555 } else 7556 status = PTR_ERR(task); 7557 trace_nfs4_bind_conn_to_session(clp, status); 7558 if (status == 0) { 7559 if (memcmp(res.sessionid.data, 7560 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 7561 dprintk("NFS: %s: Session ID mismatch\n", __func__); 7562 return -EIO; 7563 } 7564 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 7565 dprintk("NFS: %s: Unexpected direction from server\n", 7566 __func__); 7567 return -EIO; 7568 } 7569 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 7570 dprintk("NFS: %s: Server returned RDMA mode = true\n", 7571 __func__); 7572 return -EIO; 7573 } 7574 } 7575 7576 return status; 7577 } 7578 7579 struct rpc_bind_conn_calldata { 7580 struct nfs_client *clp; 7581 struct rpc_cred *cred; 7582 }; 7583 7584 static int 7585 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 7586 struct rpc_xprt *xprt, 7587 void *calldata) 7588 { 7589 struct rpc_bind_conn_calldata *p = calldata; 7590 7591 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 7592 } 7593 7594 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 7595 { 7596 struct rpc_bind_conn_calldata data = { 7597 .clp = clp, 7598 .cred = cred, 7599 }; 7600 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 7601 nfs4_proc_bind_conn_to_session_callback, &data); 7602 } 7603 7604 /* 7605 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 7606 * and operations we'd like to see to enable certain features in the allow map 7607 */ 7608 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 7609 .how = SP4_MACH_CRED, 7610 .enforce.u.words = { 7611 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7612 1 << (OP_EXCHANGE_ID - 32) | 7613 1 << (OP_CREATE_SESSION - 32) | 7614 1 << (OP_DESTROY_SESSION - 32) | 7615 1 << (OP_DESTROY_CLIENTID - 32) 7616 }, 7617 .allow.u.words = { 7618 [0] = 1 << (OP_CLOSE) | 7619 1 << (OP_OPEN_DOWNGRADE) | 7620 1 << (OP_LOCKU) | 7621 1 << (OP_DELEGRETURN) | 7622 1 << (OP_COMMIT), 7623 [1] = 1 << (OP_SECINFO - 32) | 7624 1 << (OP_SECINFO_NO_NAME - 32) | 7625 1 << (OP_LAYOUTRETURN - 32) | 7626 1 << (OP_TEST_STATEID - 32) | 7627 1 << (OP_FREE_STATEID - 32) | 7628 1 << (OP_WRITE - 32) 7629 } 7630 }; 7631 7632 /* 7633 * Select the state protection mode for client `clp' given the server results 7634 * from exchange_id in `sp'. 7635 * 7636 * Returns 0 on success, negative errno otherwise. 7637 */ 7638 static int nfs4_sp4_select_mode(struct nfs_client *clp, 7639 struct nfs41_state_protection *sp) 7640 { 7641 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 7642 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7643 1 << (OP_EXCHANGE_ID - 32) | 7644 1 << (OP_CREATE_SESSION - 32) | 7645 1 << (OP_DESTROY_SESSION - 32) | 7646 1 << (OP_DESTROY_CLIENTID - 32) 7647 }; 7648 unsigned long flags = 0; 7649 unsigned int i; 7650 int ret = 0; 7651 7652 if (sp->how == SP4_MACH_CRED) { 7653 /* Print state protect result */ 7654 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 7655 for (i = 0; i <= LAST_NFS4_OP; i++) { 7656 if (test_bit(i, sp->enforce.u.longs)) 7657 dfprintk(MOUNT, " enforce op %d\n", i); 7658 if (test_bit(i, sp->allow.u.longs)) 7659 dfprintk(MOUNT, " allow op %d\n", i); 7660 } 7661 7662 /* make sure nothing is on enforce list that isn't supported */ 7663 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 7664 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 7665 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7666 ret = -EINVAL; 7667 goto out; 7668 } 7669 } 7670 7671 /* 7672 * Minimal mode - state operations are allowed to use machine 7673 * credential. Note this already happens by default, so the 7674 * client doesn't have to do anything more than the negotiation. 7675 * 7676 * NOTE: we don't care if EXCHANGE_ID is in the list - 7677 * we're already using the machine cred for exchange_id 7678 * and will never use a different cred. 7679 */ 7680 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 7681 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 7682 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 7683 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 7684 dfprintk(MOUNT, "sp4_mach_cred:\n"); 7685 dfprintk(MOUNT, " minimal mode enabled\n"); 7686 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 7687 } else { 7688 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7689 ret = -EINVAL; 7690 goto out; 7691 } 7692 7693 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 7694 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 7695 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 7696 test_bit(OP_LOCKU, sp->allow.u.longs)) { 7697 dfprintk(MOUNT, " cleanup mode enabled\n"); 7698 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 7699 } 7700 7701 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 7702 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 7703 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 7704 } 7705 7706 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 7707 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 7708 dfprintk(MOUNT, " secinfo mode enabled\n"); 7709 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 7710 } 7711 7712 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 7713 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 7714 dfprintk(MOUNT, " stateid mode enabled\n"); 7715 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 7716 } 7717 7718 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 7719 dfprintk(MOUNT, " write mode enabled\n"); 7720 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 7721 } 7722 7723 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 7724 dfprintk(MOUNT, " commit mode enabled\n"); 7725 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 7726 } 7727 } 7728 out: 7729 clp->cl_sp4_flags = flags; 7730 return 0; 7731 } 7732 7733 struct nfs41_exchange_id_data { 7734 struct nfs41_exchange_id_res res; 7735 struct nfs41_exchange_id_args args; 7736 }; 7737 7738 static void nfs4_exchange_id_release(void *data) 7739 { 7740 struct nfs41_exchange_id_data *cdata = 7741 (struct nfs41_exchange_id_data *)data; 7742 7743 nfs_put_client(cdata->args.client); 7744 kfree(cdata->res.impl_id); 7745 kfree(cdata->res.server_scope); 7746 kfree(cdata->res.server_owner); 7747 kfree(cdata); 7748 } 7749 7750 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 7751 .rpc_release = nfs4_exchange_id_release, 7752 }; 7753 7754 /* 7755 * _nfs4_proc_exchange_id() 7756 * 7757 * Wrapper for EXCHANGE_ID operation. 7758 */ 7759 static struct rpc_task * 7760 nfs4_run_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7761 u32 sp4_how, struct rpc_xprt *xprt) 7762 { 7763 struct rpc_message msg = { 7764 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 7765 .rpc_cred = cred, 7766 }; 7767 struct rpc_task_setup task_setup_data = { 7768 .rpc_client = clp->cl_rpcclient, 7769 .callback_ops = &nfs4_exchange_id_call_ops, 7770 .rpc_message = &msg, 7771 .flags = RPC_TASK_TIMEOUT, 7772 }; 7773 struct nfs41_exchange_id_data *calldata; 7774 int status; 7775 7776 if (!refcount_inc_not_zero(&clp->cl_count)) 7777 return ERR_PTR(-EIO); 7778 7779 status = -ENOMEM; 7780 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7781 if (!calldata) 7782 goto out; 7783 7784 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 7785 7786 status = nfs4_init_uniform_client_string(clp); 7787 if (status) 7788 goto out_calldata; 7789 7790 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 7791 GFP_NOFS); 7792 status = -ENOMEM; 7793 if (unlikely(calldata->res.server_owner == NULL)) 7794 goto out_calldata; 7795 7796 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 7797 GFP_NOFS); 7798 if (unlikely(calldata->res.server_scope == NULL)) 7799 goto out_server_owner; 7800 7801 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 7802 if (unlikely(calldata->res.impl_id == NULL)) 7803 goto out_server_scope; 7804 7805 switch (sp4_how) { 7806 case SP4_NONE: 7807 calldata->args.state_protect.how = SP4_NONE; 7808 break; 7809 7810 case SP4_MACH_CRED: 7811 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 7812 break; 7813 7814 default: 7815 /* unsupported! */ 7816 WARN_ON_ONCE(1); 7817 status = -EINVAL; 7818 goto out_impl_id; 7819 } 7820 if (xprt) { 7821 task_setup_data.rpc_xprt = xprt; 7822 task_setup_data.flags |= RPC_TASK_SOFTCONN; 7823 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 7824 sizeof(calldata->args.verifier.data)); 7825 } 7826 calldata->args.client = clp; 7827 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 7828 EXCHGID4_FLAG_BIND_PRINC_STATEID; 7829 #ifdef CONFIG_NFS_V4_1_MIGRATION 7830 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 7831 #endif 7832 msg.rpc_argp = &calldata->args; 7833 msg.rpc_resp = &calldata->res; 7834 task_setup_data.callback_data = calldata; 7835 7836 return rpc_run_task(&task_setup_data); 7837 7838 out_impl_id: 7839 kfree(calldata->res.impl_id); 7840 out_server_scope: 7841 kfree(calldata->res.server_scope); 7842 out_server_owner: 7843 kfree(calldata->res.server_owner); 7844 out_calldata: 7845 kfree(calldata); 7846 out: 7847 nfs_put_client(clp); 7848 return ERR_PTR(status); 7849 } 7850 7851 /* 7852 * _nfs4_proc_exchange_id() 7853 * 7854 * Wrapper for EXCHANGE_ID operation. 7855 */ 7856 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7857 u32 sp4_how) 7858 { 7859 struct rpc_task *task; 7860 struct nfs41_exchange_id_args *argp; 7861 struct nfs41_exchange_id_res *resp; 7862 int status; 7863 7864 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 7865 if (IS_ERR(task)) 7866 return PTR_ERR(task); 7867 7868 argp = task->tk_msg.rpc_argp; 7869 resp = task->tk_msg.rpc_resp; 7870 status = task->tk_status; 7871 if (status != 0) 7872 goto out; 7873 7874 status = nfs4_check_cl_exchange_flags(resp->flags); 7875 if (status != 0) 7876 goto out; 7877 7878 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 7879 if (status != 0) 7880 goto out; 7881 7882 clp->cl_clientid = resp->clientid; 7883 clp->cl_exchange_flags = resp->flags; 7884 clp->cl_seqid = resp->seqid; 7885 /* Client ID is not confirmed */ 7886 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 7887 clear_bit(NFS4_SESSION_ESTABLISHED, 7888 &clp->cl_session->session_state); 7889 7890 if (clp->cl_serverscope != NULL && 7891 !nfs41_same_server_scope(clp->cl_serverscope, 7892 resp->server_scope)) { 7893 dprintk("%s: server_scope mismatch detected\n", 7894 __func__); 7895 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 7896 } 7897 7898 swap(clp->cl_serverowner, resp->server_owner); 7899 swap(clp->cl_serverscope, resp->server_scope); 7900 swap(clp->cl_implid, resp->impl_id); 7901 7902 /* Save the EXCHANGE_ID verifier session trunk tests */ 7903 memcpy(clp->cl_confirm.data, argp->verifier.data, 7904 sizeof(clp->cl_confirm.data)); 7905 out: 7906 trace_nfs4_exchange_id(clp, status); 7907 rpc_put_task(task); 7908 return status; 7909 } 7910 7911 /* 7912 * nfs4_proc_exchange_id() 7913 * 7914 * Returns zero, a negative errno, or a negative NFS4ERR status code. 7915 * 7916 * Since the clientid has expired, all compounds using sessions 7917 * associated with the stale clientid will be returning 7918 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 7919 * be in some phase of session reset. 7920 * 7921 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 7922 */ 7923 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 7924 { 7925 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 7926 int status; 7927 7928 /* try SP4_MACH_CRED if krb5i/p */ 7929 if (authflavor == RPC_AUTH_GSS_KRB5I || 7930 authflavor == RPC_AUTH_GSS_KRB5P) { 7931 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 7932 if (!status) 7933 return 0; 7934 } 7935 7936 /* try SP4_NONE */ 7937 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 7938 } 7939 7940 /** 7941 * nfs4_test_session_trunk 7942 * 7943 * This is an add_xprt_test() test function called from 7944 * rpc_clnt_setup_test_and_add_xprt. 7945 * 7946 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 7947 * and is dereferrenced in nfs4_exchange_id_release 7948 * 7949 * Upon success, add the new transport to the rpc_clnt 7950 * 7951 * @clnt: struct rpc_clnt to get new transport 7952 * @xprt: the rpc_xprt to test 7953 * @data: call data for _nfs4_proc_exchange_id. 7954 */ 7955 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 7956 void *data) 7957 { 7958 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 7959 struct rpc_task *task; 7960 int status; 7961 7962 u32 sp4_how; 7963 7964 dprintk("--> %s try %s\n", __func__, 7965 xprt->address_strings[RPC_DISPLAY_ADDR]); 7966 7967 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 7968 7969 /* Test connection for session trunking. Async exchange_id call */ 7970 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 7971 if (IS_ERR(task)) 7972 return PTR_ERR(task); 7973 7974 status = task->tk_status; 7975 if (status == 0) 7976 status = nfs4_detect_session_trunking(adata->clp, 7977 task->tk_msg.rpc_resp, xprt); 7978 7979 rpc_put_task(task); 7980 return status; 7981 } 7982 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 7983 7984 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 7985 struct rpc_cred *cred) 7986 { 7987 struct rpc_message msg = { 7988 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 7989 .rpc_argp = clp, 7990 .rpc_cred = cred, 7991 }; 7992 int status; 7993 7994 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7995 trace_nfs4_destroy_clientid(clp, status); 7996 if (status) 7997 dprintk("NFS: Got error %d from the server %s on " 7998 "DESTROY_CLIENTID.", status, clp->cl_hostname); 7999 return status; 8000 } 8001 8002 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8003 struct rpc_cred *cred) 8004 { 8005 unsigned int loop; 8006 int ret; 8007 8008 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8009 ret = _nfs4_proc_destroy_clientid(clp, cred); 8010 switch (ret) { 8011 case -NFS4ERR_DELAY: 8012 case -NFS4ERR_CLIENTID_BUSY: 8013 ssleep(1); 8014 break; 8015 default: 8016 return ret; 8017 } 8018 } 8019 return 0; 8020 } 8021 8022 int nfs4_destroy_clientid(struct nfs_client *clp) 8023 { 8024 struct rpc_cred *cred; 8025 int ret = 0; 8026 8027 if (clp->cl_mvops->minor_version < 1) 8028 goto out; 8029 if (clp->cl_exchange_flags == 0) 8030 goto out; 8031 if (clp->cl_preserve_clid) 8032 goto out; 8033 cred = nfs4_get_clid_cred(clp); 8034 ret = nfs4_proc_destroy_clientid(clp, cred); 8035 if (cred) 8036 put_rpccred(cred); 8037 switch (ret) { 8038 case 0: 8039 case -NFS4ERR_STALE_CLIENTID: 8040 clp->cl_exchange_flags = 0; 8041 } 8042 out: 8043 return ret; 8044 } 8045 8046 struct nfs4_get_lease_time_data { 8047 struct nfs4_get_lease_time_args *args; 8048 struct nfs4_get_lease_time_res *res; 8049 struct nfs_client *clp; 8050 }; 8051 8052 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 8053 void *calldata) 8054 { 8055 struct nfs4_get_lease_time_data *data = 8056 (struct nfs4_get_lease_time_data *)calldata; 8057 8058 dprintk("--> %s\n", __func__); 8059 /* just setup sequence, do not trigger session recovery 8060 since we're invoked within one */ 8061 nfs4_setup_sequence(data->clp, 8062 &data->args->la_seq_args, 8063 &data->res->lr_seq_res, 8064 task); 8065 dprintk("<-- %s\n", __func__); 8066 } 8067 8068 /* 8069 * Called from nfs4_state_manager thread for session setup, so don't recover 8070 * from sequence operation or clientid errors. 8071 */ 8072 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 8073 { 8074 struct nfs4_get_lease_time_data *data = 8075 (struct nfs4_get_lease_time_data *)calldata; 8076 8077 dprintk("--> %s\n", __func__); 8078 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 8079 return; 8080 switch (task->tk_status) { 8081 case -NFS4ERR_DELAY: 8082 case -NFS4ERR_GRACE: 8083 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 8084 rpc_delay(task, NFS4_POLL_RETRY_MIN); 8085 task->tk_status = 0; 8086 /* fall through */ 8087 case -NFS4ERR_RETRY_UNCACHED_REP: 8088 rpc_restart_call_prepare(task); 8089 return; 8090 } 8091 dprintk("<-- %s\n", __func__); 8092 } 8093 8094 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 8095 .rpc_call_prepare = nfs4_get_lease_time_prepare, 8096 .rpc_call_done = nfs4_get_lease_time_done, 8097 }; 8098 8099 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 8100 { 8101 struct rpc_task *task; 8102 struct nfs4_get_lease_time_args args; 8103 struct nfs4_get_lease_time_res res = { 8104 .lr_fsinfo = fsinfo, 8105 }; 8106 struct nfs4_get_lease_time_data data = { 8107 .args = &args, 8108 .res = &res, 8109 .clp = clp, 8110 }; 8111 struct rpc_message msg = { 8112 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 8113 .rpc_argp = &args, 8114 .rpc_resp = &res, 8115 }; 8116 struct rpc_task_setup task_setup = { 8117 .rpc_client = clp->cl_rpcclient, 8118 .rpc_message = &msg, 8119 .callback_ops = &nfs4_get_lease_time_ops, 8120 .callback_data = &data, 8121 .flags = RPC_TASK_TIMEOUT, 8122 }; 8123 int status; 8124 8125 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 8126 task = rpc_run_task(&task_setup); 8127 8128 if (IS_ERR(task)) 8129 return PTR_ERR(task); 8130 8131 status = task->tk_status; 8132 rpc_put_task(task); 8133 return status; 8134 } 8135 8136 /* 8137 * Initialize the values to be used by the client in CREATE_SESSION 8138 * If nfs4_init_session set the fore channel request and response sizes, 8139 * use them. 8140 * 8141 * Set the back channel max_resp_sz_cached to zero to force the client to 8142 * always set csa_cachethis to FALSE because the current implementation 8143 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 8144 */ 8145 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 8146 struct rpc_clnt *clnt) 8147 { 8148 unsigned int max_rqst_sz, max_resp_sz; 8149 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 8150 8151 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 8152 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 8153 8154 /* Fore channel attributes */ 8155 args->fc_attrs.max_rqst_sz = max_rqst_sz; 8156 args->fc_attrs.max_resp_sz = max_resp_sz; 8157 args->fc_attrs.max_ops = NFS4_MAX_OPS; 8158 args->fc_attrs.max_reqs = max_session_slots; 8159 8160 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 8161 "max_ops=%u max_reqs=%u\n", 8162 __func__, 8163 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 8164 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 8165 8166 /* Back channel attributes */ 8167 args->bc_attrs.max_rqst_sz = max_bc_payload; 8168 args->bc_attrs.max_resp_sz = max_bc_payload; 8169 args->bc_attrs.max_resp_sz_cached = 0; 8170 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 8171 args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1); 8172 8173 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 8174 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 8175 __func__, 8176 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 8177 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 8178 args->bc_attrs.max_reqs); 8179 } 8180 8181 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 8182 struct nfs41_create_session_res *res) 8183 { 8184 struct nfs4_channel_attrs *sent = &args->fc_attrs; 8185 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 8186 8187 if (rcvd->max_resp_sz > sent->max_resp_sz) 8188 return -EINVAL; 8189 /* 8190 * Our requested max_ops is the minimum we need; we're not 8191 * prepared to break up compounds into smaller pieces than that. 8192 * So, no point even trying to continue if the server won't 8193 * cooperate: 8194 */ 8195 if (rcvd->max_ops < sent->max_ops) 8196 return -EINVAL; 8197 if (rcvd->max_reqs == 0) 8198 return -EINVAL; 8199 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 8200 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 8201 return 0; 8202 } 8203 8204 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 8205 struct nfs41_create_session_res *res) 8206 { 8207 struct nfs4_channel_attrs *sent = &args->bc_attrs; 8208 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 8209 8210 if (!(res->flags & SESSION4_BACK_CHAN)) 8211 goto out; 8212 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 8213 return -EINVAL; 8214 if (rcvd->max_resp_sz < sent->max_resp_sz) 8215 return -EINVAL; 8216 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 8217 return -EINVAL; 8218 if (rcvd->max_ops > sent->max_ops) 8219 return -EINVAL; 8220 if (rcvd->max_reqs > sent->max_reqs) 8221 return -EINVAL; 8222 out: 8223 return 0; 8224 } 8225 8226 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 8227 struct nfs41_create_session_res *res) 8228 { 8229 int ret; 8230 8231 ret = nfs4_verify_fore_channel_attrs(args, res); 8232 if (ret) 8233 return ret; 8234 return nfs4_verify_back_channel_attrs(args, res); 8235 } 8236 8237 static void nfs4_update_session(struct nfs4_session *session, 8238 struct nfs41_create_session_res *res) 8239 { 8240 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 8241 /* Mark client id and session as being confirmed */ 8242 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 8243 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 8244 session->flags = res->flags; 8245 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 8246 if (res->flags & SESSION4_BACK_CHAN) 8247 memcpy(&session->bc_attrs, &res->bc_attrs, 8248 sizeof(session->bc_attrs)); 8249 } 8250 8251 static int _nfs4_proc_create_session(struct nfs_client *clp, 8252 struct rpc_cred *cred) 8253 { 8254 struct nfs4_session *session = clp->cl_session; 8255 struct nfs41_create_session_args args = { 8256 .client = clp, 8257 .clientid = clp->cl_clientid, 8258 .seqid = clp->cl_seqid, 8259 .cb_program = NFS4_CALLBACK, 8260 }; 8261 struct nfs41_create_session_res res; 8262 8263 struct rpc_message msg = { 8264 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 8265 .rpc_argp = &args, 8266 .rpc_resp = &res, 8267 .rpc_cred = cred, 8268 }; 8269 int status; 8270 8271 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 8272 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 8273 8274 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8275 trace_nfs4_create_session(clp, status); 8276 8277 switch (status) { 8278 case -NFS4ERR_STALE_CLIENTID: 8279 case -NFS4ERR_DELAY: 8280 case -ETIMEDOUT: 8281 case -EACCES: 8282 case -EAGAIN: 8283 goto out; 8284 }; 8285 8286 clp->cl_seqid++; 8287 if (!status) { 8288 /* Verify the session's negotiated channel_attrs values */ 8289 status = nfs4_verify_channel_attrs(&args, &res); 8290 /* Increment the clientid slot sequence id */ 8291 if (status) 8292 goto out; 8293 nfs4_update_session(session, &res); 8294 } 8295 out: 8296 return status; 8297 } 8298 8299 /* 8300 * Issues a CREATE_SESSION operation to the server. 8301 * It is the responsibility of the caller to verify the session is 8302 * expired before calling this routine. 8303 */ 8304 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 8305 { 8306 int status; 8307 unsigned *ptr; 8308 struct nfs4_session *session = clp->cl_session; 8309 8310 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 8311 8312 status = _nfs4_proc_create_session(clp, cred); 8313 if (status) 8314 goto out; 8315 8316 /* Init or reset the session slot tables */ 8317 status = nfs4_setup_session_slot_tables(session); 8318 dprintk("slot table setup returned %d\n", status); 8319 if (status) 8320 goto out; 8321 8322 ptr = (unsigned *)&session->sess_id.data[0]; 8323 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 8324 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 8325 out: 8326 dprintk("<-- %s\n", __func__); 8327 return status; 8328 } 8329 8330 /* 8331 * Issue the over-the-wire RPC DESTROY_SESSION. 8332 * The caller must serialize access to this routine. 8333 */ 8334 int nfs4_proc_destroy_session(struct nfs4_session *session, 8335 struct rpc_cred *cred) 8336 { 8337 struct rpc_message msg = { 8338 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 8339 .rpc_argp = session, 8340 .rpc_cred = cred, 8341 }; 8342 int status = 0; 8343 8344 dprintk("--> nfs4_proc_destroy_session\n"); 8345 8346 /* session is still being setup */ 8347 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 8348 return 0; 8349 8350 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8351 trace_nfs4_destroy_session(session->clp, status); 8352 8353 if (status) 8354 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 8355 "Session has been destroyed regardless...\n", status); 8356 8357 dprintk("<-- nfs4_proc_destroy_session\n"); 8358 return status; 8359 } 8360 8361 /* 8362 * Renew the cl_session lease. 8363 */ 8364 struct nfs4_sequence_data { 8365 struct nfs_client *clp; 8366 struct nfs4_sequence_args args; 8367 struct nfs4_sequence_res res; 8368 }; 8369 8370 static void nfs41_sequence_release(void *data) 8371 { 8372 struct nfs4_sequence_data *calldata = data; 8373 struct nfs_client *clp = calldata->clp; 8374 8375 if (refcount_read(&clp->cl_count) > 1) 8376 nfs4_schedule_state_renewal(clp); 8377 nfs_put_client(clp); 8378 kfree(calldata); 8379 } 8380 8381 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8382 { 8383 switch(task->tk_status) { 8384 case -NFS4ERR_DELAY: 8385 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8386 return -EAGAIN; 8387 default: 8388 nfs4_schedule_lease_recovery(clp); 8389 } 8390 return 0; 8391 } 8392 8393 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 8394 { 8395 struct nfs4_sequence_data *calldata = data; 8396 struct nfs_client *clp = calldata->clp; 8397 8398 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 8399 return; 8400 8401 trace_nfs4_sequence(clp, task->tk_status); 8402 if (task->tk_status < 0) { 8403 dprintk("%s ERROR %d\n", __func__, task->tk_status); 8404 if (refcount_read(&clp->cl_count) == 1) 8405 goto out; 8406 8407 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 8408 rpc_restart_call_prepare(task); 8409 return; 8410 } 8411 } 8412 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 8413 out: 8414 dprintk("<-- %s\n", __func__); 8415 } 8416 8417 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 8418 { 8419 struct nfs4_sequence_data *calldata = data; 8420 struct nfs_client *clp = calldata->clp; 8421 struct nfs4_sequence_args *args; 8422 struct nfs4_sequence_res *res; 8423 8424 args = task->tk_msg.rpc_argp; 8425 res = task->tk_msg.rpc_resp; 8426 8427 nfs4_setup_sequence(clp, args, res, task); 8428 } 8429 8430 static const struct rpc_call_ops nfs41_sequence_ops = { 8431 .rpc_call_done = nfs41_sequence_call_done, 8432 .rpc_call_prepare = nfs41_sequence_prepare, 8433 .rpc_release = nfs41_sequence_release, 8434 }; 8435 8436 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 8437 struct rpc_cred *cred, 8438 struct nfs4_slot *slot, 8439 bool is_privileged) 8440 { 8441 struct nfs4_sequence_data *calldata; 8442 struct rpc_message msg = { 8443 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 8444 .rpc_cred = cred, 8445 }; 8446 struct rpc_task_setup task_setup_data = { 8447 .rpc_client = clp->cl_rpcclient, 8448 .rpc_message = &msg, 8449 .callback_ops = &nfs41_sequence_ops, 8450 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 8451 }; 8452 struct rpc_task *ret; 8453 8454 ret = ERR_PTR(-EIO); 8455 if (!refcount_inc_not_zero(&clp->cl_count)) 8456 goto out_err; 8457 8458 ret = ERR_PTR(-ENOMEM); 8459 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8460 if (calldata == NULL) 8461 goto out_put_clp; 8462 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 8463 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 8464 msg.rpc_argp = &calldata->args; 8465 msg.rpc_resp = &calldata->res; 8466 calldata->clp = clp; 8467 task_setup_data.callback_data = calldata; 8468 8469 ret = rpc_run_task(&task_setup_data); 8470 if (IS_ERR(ret)) 8471 goto out_err; 8472 return ret; 8473 out_put_clp: 8474 nfs_put_client(clp); 8475 out_err: 8476 nfs41_release_slot(slot); 8477 return ret; 8478 } 8479 8480 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 8481 { 8482 struct rpc_task *task; 8483 int ret = 0; 8484 8485 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 8486 return -EAGAIN; 8487 task = _nfs41_proc_sequence(clp, cred, NULL, false); 8488 if (IS_ERR(task)) 8489 ret = PTR_ERR(task); 8490 else 8491 rpc_put_task_async(task); 8492 dprintk("<-- %s status=%d\n", __func__, ret); 8493 return ret; 8494 } 8495 8496 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 8497 { 8498 struct rpc_task *task; 8499 int ret; 8500 8501 task = _nfs41_proc_sequence(clp, cred, NULL, true); 8502 if (IS_ERR(task)) { 8503 ret = PTR_ERR(task); 8504 goto out; 8505 } 8506 ret = rpc_wait_for_completion_task(task); 8507 if (!ret) 8508 ret = task->tk_status; 8509 rpc_put_task(task); 8510 out: 8511 dprintk("<-- %s status=%d\n", __func__, ret); 8512 return ret; 8513 } 8514 8515 struct nfs4_reclaim_complete_data { 8516 struct nfs_client *clp; 8517 struct nfs41_reclaim_complete_args arg; 8518 struct nfs41_reclaim_complete_res res; 8519 }; 8520 8521 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 8522 { 8523 struct nfs4_reclaim_complete_data *calldata = data; 8524 8525 nfs4_setup_sequence(calldata->clp, 8526 &calldata->arg.seq_args, 8527 &calldata->res.seq_res, 8528 task); 8529 } 8530 8531 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8532 { 8533 switch(task->tk_status) { 8534 case 0: 8535 wake_up_all(&clp->cl_lock_waitq); 8536 /* Fallthrough */ 8537 case -NFS4ERR_COMPLETE_ALREADY: 8538 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 8539 break; 8540 case -NFS4ERR_DELAY: 8541 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8542 /* fall through */ 8543 case -NFS4ERR_RETRY_UNCACHED_REP: 8544 return -EAGAIN; 8545 case -NFS4ERR_BADSESSION: 8546 case -NFS4ERR_DEADSESSION: 8547 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 8548 nfs4_schedule_session_recovery(clp->cl_session, 8549 task->tk_status); 8550 break; 8551 default: 8552 nfs4_schedule_lease_recovery(clp); 8553 } 8554 return 0; 8555 } 8556 8557 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 8558 { 8559 struct nfs4_reclaim_complete_data *calldata = data; 8560 struct nfs_client *clp = calldata->clp; 8561 struct nfs4_sequence_res *res = &calldata->res.seq_res; 8562 8563 dprintk("--> %s\n", __func__); 8564 if (!nfs41_sequence_done(task, res)) 8565 return; 8566 8567 trace_nfs4_reclaim_complete(clp, task->tk_status); 8568 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 8569 rpc_restart_call_prepare(task); 8570 return; 8571 } 8572 dprintk("<-- %s\n", __func__); 8573 } 8574 8575 static void nfs4_free_reclaim_complete_data(void *data) 8576 { 8577 struct nfs4_reclaim_complete_data *calldata = data; 8578 8579 kfree(calldata); 8580 } 8581 8582 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 8583 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 8584 .rpc_call_done = nfs4_reclaim_complete_done, 8585 .rpc_release = nfs4_free_reclaim_complete_data, 8586 }; 8587 8588 /* 8589 * Issue a global reclaim complete. 8590 */ 8591 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 8592 struct rpc_cred *cred) 8593 { 8594 struct nfs4_reclaim_complete_data *calldata; 8595 struct rpc_task *task; 8596 struct rpc_message msg = { 8597 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 8598 .rpc_cred = cred, 8599 }; 8600 struct rpc_task_setup task_setup_data = { 8601 .rpc_client = clp->cl_rpcclient, 8602 .rpc_message = &msg, 8603 .callback_ops = &nfs4_reclaim_complete_call_ops, 8604 .flags = RPC_TASK_ASYNC, 8605 }; 8606 int status = -ENOMEM; 8607 8608 dprintk("--> %s\n", __func__); 8609 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8610 if (calldata == NULL) 8611 goto out; 8612 calldata->clp = clp; 8613 calldata->arg.one_fs = 0; 8614 8615 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 8616 msg.rpc_argp = &calldata->arg; 8617 msg.rpc_resp = &calldata->res; 8618 task_setup_data.callback_data = calldata; 8619 task = rpc_run_task(&task_setup_data); 8620 if (IS_ERR(task)) { 8621 status = PTR_ERR(task); 8622 goto out; 8623 } 8624 status = rpc_wait_for_completion_task(task); 8625 if (status == 0) 8626 status = task->tk_status; 8627 rpc_put_task(task); 8628 out: 8629 dprintk("<-- %s status=%d\n", __func__, status); 8630 return status; 8631 } 8632 8633 static void 8634 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 8635 { 8636 struct nfs4_layoutget *lgp = calldata; 8637 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 8638 8639 dprintk("--> %s\n", __func__); 8640 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 8641 &lgp->res.seq_res, task); 8642 dprintk("<-- %s\n", __func__); 8643 } 8644 8645 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 8646 { 8647 struct nfs4_layoutget *lgp = calldata; 8648 8649 dprintk("--> %s\n", __func__); 8650 nfs41_sequence_process(task, &lgp->res.seq_res); 8651 dprintk("<-- %s\n", __func__); 8652 } 8653 8654 static int 8655 nfs4_layoutget_handle_exception(struct rpc_task *task, 8656 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 8657 { 8658 struct inode *inode = lgp->args.inode; 8659 struct nfs_server *server = NFS_SERVER(inode); 8660 struct pnfs_layout_hdr *lo; 8661 int nfs4err = task->tk_status; 8662 int err, status = 0; 8663 LIST_HEAD(head); 8664 8665 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 8666 8667 nfs4_sequence_free_slot(&lgp->res.seq_res); 8668 8669 switch (nfs4err) { 8670 case 0: 8671 goto out; 8672 8673 /* 8674 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 8675 * on the file. set tk_status to -ENODATA to tell upper layer to 8676 * retry go inband. 8677 */ 8678 case -NFS4ERR_LAYOUTUNAVAILABLE: 8679 status = -ENODATA; 8680 goto out; 8681 /* 8682 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 8683 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 8684 */ 8685 case -NFS4ERR_BADLAYOUT: 8686 status = -EOVERFLOW; 8687 goto out; 8688 /* 8689 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 8690 * (or clients) writing to the same RAID stripe except when 8691 * the minlength argument is 0 (see RFC5661 section 18.43.3). 8692 * 8693 * Treat it like we would RECALLCONFLICT -- we retry for a little 8694 * while, and then eventually give up. 8695 */ 8696 case -NFS4ERR_LAYOUTTRYLATER: 8697 if (lgp->args.minlength == 0) { 8698 status = -EOVERFLOW; 8699 goto out; 8700 } 8701 status = -EBUSY; 8702 break; 8703 case -NFS4ERR_RECALLCONFLICT: 8704 status = -ERECALLCONFLICT; 8705 break; 8706 case -NFS4ERR_DELEG_REVOKED: 8707 case -NFS4ERR_ADMIN_REVOKED: 8708 case -NFS4ERR_EXPIRED: 8709 case -NFS4ERR_BAD_STATEID: 8710 exception->timeout = 0; 8711 spin_lock(&inode->i_lock); 8712 lo = NFS_I(inode)->layout; 8713 /* If the open stateid was bad, then recover it. */ 8714 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 8715 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 8716 spin_unlock(&inode->i_lock); 8717 exception->state = lgp->args.ctx->state; 8718 exception->stateid = &lgp->args.stateid; 8719 break; 8720 } 8721 8722 /* 8723 * Mark the bad layout state as invalid, then retry 8724 */ 8725 pnfs_mark_layout_stateid_invalid(lo, &head); 8726 spin_unlock(&inode->i_lock); 8727 nfs_commit_inode(inode, 0); 8728 pnfs_free_lseg_list(&head); 8729 status = -EAGAIN; 8730 goto out; 8731 } 8732 8733 err = nfs4_handle_exception(server, nfs4err, exception); 8734 if (!status) { 8735 if (exception->retry) 8736 status = -EAGAIN; 8737 else 8738 status = err; 8739 } 8740 out: 8741 dprintk("<-- %s\n", __func__); 8742 return status; 8743 } 8744 8745 size_t max_response_pages(struct nfs_server *server) 8746 { 8747 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 8748 return nfs_page_array_len(0, max_resp_sz); 8749 } 8750 8751 static void nfs4_layoutget_release(void *calldata) 8752 { 8753 struct nfs4_layoutget *lgp = calldata; 8754 8755 dprintk("--> %s\n", __func__); 8756 nfs4_sequence_free_slot(&lgp->res.seq_res); 8757 pnfs_layoutget_free(lgp); 8758 dprintk("<-- %s\n", __func__); 8759 } 8760 8761 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 8762 .rpc_call_prepare = nfs4_layoutget_prepare, 8763 .rpc_call_done = nfs4_layoutget_done, 8764 .rpc_release = nfs4_layoutget_release, 8765 }; 8766 8767 struct pnfs_layout_segment * 8768 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 8769 { 8770 struct inode *inode = lgp->args.inode; 8771 struct nfs_server *server = NFS_SERVER(inode); 8772 struct rpc_task *task; 8773 struct rpc_message msg = { 8774 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 8775 .rpc_argp = &lgp->args, 8776 .rpc_resp = &lgp->res, 8777 .rpc_cred = lgp->cred, 8778 }; 8779 struct rpc_task_setup task_setup_data = { 8780 .rpc_client = server->client, 8781 .rpc_message = &msg, 8782 .callback_ops = &nfs4_layoutget_call_ops, 8783 .callback_data = lgp, 8784 .flags = RPC_TASK_ASYNC, 8785 }; 8786 struct pnfs_layout_segment *lseg = NULL; 8787 struct nfs4_exception exception = { 8788 .inode = inode, 8789 .timeout = *timeout, 8790 }; 8791 int status = 0; 8792 8793 dprintk("--> %s\n", __func__); 8794 8795 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 8796 pnfs_get_layout_hdr(NFS_I(inode)->layout); 8797 8798 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 8799 8800 task = rpc_run_task(&task_setup_data); 8801 if (IS_ERR(task)) 8802 return ERR_CAST(task); 8803 status = rpc_wait_for_completion_task(task); 8804 if (status != 0) 8805 goto out; 8806 8807 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 8808 if (task->tk_status < 0 || lgp->res.layoutp->len == 0) { 8809 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 8810 *timeout = exception.timeout; 8811 } else 8812 lseg = pnfs_layout_process(lgp); 8813 out: 8814 trace_nfs4_layoutget(lgp->args.ctx, 8815 &lgp->args.range, 8816 &lgp->res.range, 8817 &lgp->res.stateid, 8818 status); 8819 8820 rpc_put_task(task); 8821 dprintk("<-- %s status=%d\n", __func__, status); 8822 if (status) 8823 return ERR_PTR(status); 8824 return lseg; 8825 } 8826 8827 static void 8828 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 8829 { 8830 struct nfs4_layoutreturn *lrp = calldata; 8831 8832 dprintk("--> %s\n", __func__); 8833 nfs4_setup_sequence(lrp->clp, 8834 &lrp->args.seq_args, 8835 &lrp->res.seq_res, 8836 task); 8837 if (!pnfs_layout_is_valid(lrp->args.layout)) 8838 rpc_exit(task, 0); 8839 } 8840 8841 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 8842 { 8843 struct nfs4_layoutreturn *lrp = calldata; 8844 struct nfs_server *server; 8845 8846 dprintk("--> %s\n", __func__); 8847 8848 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 8849 return; 8850 8851 server = NFS_SERVER(lrp->args.inode); 8852 switch (task->tk_status) { 8853 case -NFS4ERR_OLD_STATEID: 8854 if (nfs4_refresh_layout_stateid(&lrp->args.stateid, 8855 lrp->args.inode)) 8856 goto out_restart; 8857 /* Fallthrough */ 8858 default: 8859 task->tk_status = 0; 8860 /* Fallthrough */ 8861 case 0: 8862 break; 8863 case -NFS4ERR_DELAY: 8864 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 8865 break; 8866 goto out_restart; 8867 } 8868 dprintk("<-- %s\n", __func__); 8869 return; 8870 out_restart: 8871 task->tk_status = 0; 8872 nfs4_sequence_free_slot(&lrp->res.seq_res); 8873 rpc_restart_call_prepare(task); 8874 } 8875 8876 static void nfs4_layoutreturn_release(void *calldata) 8877 { 8878 struct nfs4_layoutreturn *lrp = calldata; 8879 struct pnfs_layout_hdr *lo = lrp->args.layout; 8880 8881 dprintk("--> %s\n", __func__); 8882 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 8883 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 8884 nfs4_sequence_free_slot(&lrp->res.seq_res); 8885 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 8886 lrp->ld_private.ops->free(&lrp->ld_private); 8887 pnfs_put_layout_hdr(lrp->args.layout); 8888 nfs_iput_and_deactive(lrp->inode); 8889 kfree(calldata); 8890 dprintk("<-- %s\n", __func__); 8891 } 8892 8893 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 8894 .rpc_call_prepare = nfs4_layoutreturn_prepare, 8895 .rpc_call_done = nfs4_layoutreturn_done, 8896 .rpc_release = nfs4_layoutreturn_release, 8897 }; 8898 8899 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 8900 { 8901 struct rpc_task *task; 8902 struct rpc_message msg = { 8903 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 8904 .rpc_argp = &lrp->args, 8905 .rpc_resp = &lrp->res, 8906 .rpc_cred = lrp->cred, 8907 }; 8908 struct rpc_task_setup task_setup_data = { 8909 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 8910 .rpc_message = &msg, 8911 .callback_ops = &nfs4_layoutreturn_call_ops, 8912 .callback_data = lrp, 8913 }; 8914 int status = 0; 8915 8916 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 8917 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 8918 &task_setup_data.rpc_client, &msg); 8919 8920 dprintk("--> %s\n", __func__); 8921 if (!sync) { 8922 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 8923 if (!lrp->inode) { 8924 nfs4_layoutreturn_release(lrp); 8925 return -EAGAIN; 8926 } 8927 task_setup_data.flags |= RPC_TASK_ASYNC; 8928 } 8929 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0); 8930 task = rpc_run_task(&task_setup_data); 8931 if (IS_ERR(task)) 8932 return PTR_ERR(task); 8933 if (sync) 8934 status = task->tk_status; 8935 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 8936 dprintk("<-- %s status=%d\n", __func__, status); 8937 rpc_put_task(task); 8938 return status; 8939 } 8940 8941 static int 8942 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 8943 struct pnfs_device *pdev, 8944 struct rpc_cred *cred) 8945 { 8946 struct nfs4_getdeviceinfo_args args = { 8947 .pdev = pdev, 8948 .notify_types = NOTIFY_DEVICEID4_CHANGE | 8949 NOTIFY_DEVICEID4_DELETE, 8950 }; 8951 struct nfs4_getdeviceinfo_res res = { 8952 .pdev = pdev, 8953 }; 8954 struct rpc_message msg = { 8955 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 8956 .rpc_argp = &args, 8957 .rpc_resp = &res, 8958 .rpc_cred = cred, 8959 }; 8960 int status; 8961 8962 dprintk("--> %s\n", __func__); 8963 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 8964 if (res.notification & ~args.notify_types) 8965 dprintk("%s: unsupported notification\n", __func__); 8966 if (res.notification != args.notify_types) 8967 pdev->nocache = 1; 8968 8969 dprintk("<-- %s status=%d\n", __func__, status); 8970 8971 return status; 8972 } 8973 8974 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 8975 struct pnfs_device *pdev, 8976 struct rpc_cred *cred) 8977 { 8978 struct nfs4_exception exception = { }; 8979 int err; 8980 8981 do { 8982 err = nfs4_handle_exception(server, 8983 _nfs4_proc_getdeviceinfo(server, pdev, cred), 8984 &exception); 8985 } while (exception.retry); 8986 return err; 8987 } 8988 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 8989 8990 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 8991 { 8992 struct nfs4_layoutcommit_data *data = calldata; 8993 struct nfs_server *server = NFS_SERVER(data->args.inode); 8994 8995 nfs4_setup_sequence(server->nfs_client, 8996 &data->args.seq_args, 8997 &data->res.seq_res, 8998 task); 8999 } 9000 9001 static void 9002 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9003 { 9004 struct nfs4_layoutcommit_data *data = calldata; 9005 struct nfs_server *server = NFS_SERVER(data->args.inode); 9006 9007 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9008 return; 9009 9010 switch (task->tk_status) { /* Just ignore these failures */ 9011 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9012 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9013 case -NFS4ERR_BADLAYOUT: /* no layout */ 9014 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9015 task->tk_status = 0; 9016 case 0: 9017 break; 9018 default: 9019 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9020 rpc_restart_call_prepare(task); 9021 return; 9022 } 9023 } 9024 } 9025 9026 static void nfs4_layoutcommit_release(void *calldata) 9027 { 9028 struct nfs4_layoutcommit_data *data = calldata; 9029 9030 pnfs_cleanup_layoutcommit(data); 9031 nfs_post_op_update_inode_force_wcc(data->args.inode, 9032 data->res.fattr); 9033 put_rpccred(data->cred); 9034 nfs_iput_and_deactive(data->inode); 9035 kfree(data); 9036 } 9037 9038 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9039 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9040 .rpc_call_done = nfs4_layoutcommit_done, 9041 .rpc_release = nfs4_layoutcommit_release, 9042 }; 9043 9044 int 9045 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9046 { 9047 struct rpc_message msg = { 9048 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9049 .rpc_argp = &data->args, 9050 .rpc_resp = &data->res, 9051 .rpc_cred = data->cred, 9052 }; 9053 struct rpc_task_setup task_setup_data = { 9054 .task = &data->task, 9055 .rpc_client = NFS_CLIENT(data->args.inode), 9056 .rpc_message = &msg, 9057 .callback_ops = &nfs4_layoutcommit_ops, 9058 .callback_data = data, 9059 }; 9060 struct rpc_task *task; 9061 int status = 0; 9062 9063 dprintk("NFS: initiating layoutcommit call. sync %d " 9064 "lbw: %llu inode %lu\n", sync, 9065 data->args.lastbytewritten, 9066 data->args.inode->i_ino); 9067 9068 if (!sync) { 9069 data->inode = nfs_igrab_and_active(data->args.inode); 9070 if (data->inode == NULL) { 9071 nfs4_layoutcommit_release(data); 9072 return -EAGAIN; 9073 } 9074 task_setup_data.flags = RPC_TASK_ASYNC; 9075 } 9076 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 9077 task = rpc_run_task(&task_setup_data); 9078 if (IS_ERR(task)) 9079 return PTR_ERR(task); 9080 if (sync) 9081 status = task->tk_status; 9082 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 9083 dprintk("%s: status %d\n", __func__, status); 9084 rpc_put_task(task); 9085 return status; 9086 } 9087 9088 /** 9089 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 9090 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 9091 */ 9092 static int 9093 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9094 struct nfs_fsinfo *info, 9095 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 9096 { 9097 struct nfs41_secinfo_no_name_args args = { 9098 .style = SECINFO_STYLE_CURRENT_FH, 9099 }; 9100 struct nfs4_secinfo_res res = { 9101 .flavors = flavors, 9102 }; 9103 struct rpc_message msg = { 9104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 9105 .rpc_argp = &args, 9106 .rpc_resp = &res, 9107 }; 9108 struct rpc_clnt *clnt = server->client; 9109 struct rpc_cred *cred = NULL; 9110 int status; 9111 9112 if (use_integrity) { 9113 clnt = server->nfs_client->cl_rpcclient; 9114 cred = nfs4_get_clid_cred(server->nfs_client); 9115 msg.rpc_cred = cred; 9116 } 9117 9118 dprintk("--> %s\n", __func__); 9119 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 9120 &res.seq_res, 0); 9121 dprintk("<-- %s status=%d\n", __func__, status); 9122 9123 if (cred) 9124 put_rpccred(cred); 9125 9126 return status; 9127 } 9128 9129 static int 9130 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9131 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 9132 { 9133 struct nfs4_exception exception = { }; 9134 int err; 9135 do { 9136 /* first try using integrity protection */ 9137 err = -NFS4ERR_WRONGSEC; 9138 9139 /* try to use integrity protection with machine cred */ 9140 if (_nfs4_is_integrity_protected(server->nfs_client)) 9141 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9142 flavors, true); 9143 9144 /* 9145 * if unable to use integrity protection, or SECINFO with 9146 * integrity protection returns NFS4ERR_WRONGSEC (which is 9147 * disallowed by spec, but exists in deployed servers) use 9148 * the current filesystem's rpc_client and the user cred. 9149 */ 9150 if (err == -NFS4ERR_WRONGSEC) 9151 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9152 flavors, false); 9153 9154 switch (err) { 9155 case 0: 9156 case -NFS4ERR_WRONGSEC: 9157 case -ENOTSUPP: 9158 goto out; 9159 default: 9160 err = nfs4_handle_exception(server, err, &exception); 9161 } 9162 } while (exception.retry); 9163 out: 9164 return err; 9165 } 9166 9167 static int 9168 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 9169 struct nfs_fsinfo *info) 9170 { 9171 int err; 9172 struct page *page; 9173 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 9174 struct nfs4_secinfo_flavors *flavors; 9175 struct nfs4_secinfo4 *secinfo; 9176 int i; 9177 9178 page = alloc_page(GFP_KERNEL); 9179 if (!page) { 9180 err = -ENOMEM; 9181 goto out; 9182 } 9183 9184 flavors = page_address(page); 9185 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 9186 9187 /* 9188 * Fall back on "guess and check" method if 9189 * the server doesn't support SECINFO_NO_NAME 9190 */ 9191 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 9192 err = nfs4_find_root_sec(server, fhandle, info); 9193 goto out_freepage; 9194 } 9195 if (err) 9196 goto out_freepage; 9197 9198 for (i = 0; i < flavors->num_flavors; i++) { 9199 secinfo = &flavors->flavors[i]; 9200 9201 switch (secinfo->flavor) { 9202 case RPC_AUTH_NULL: 9203 case RPC_AUTH_UNIX: 9204 case RPC_AUTH_GSS: 9205 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 9206 &secinfo->flavor_info); 9207 break; 9208 default: 9209 flavor = RPC_AUTH_MAXFLAVOR; 9210 break; 9211 } 9212 9213 if (!nfs_auth_info_match(&server->auth_info, flavor)) 9214 flavor = RPC_AUTH_MAXFLAVOR; 9215 9216 if (flavor != RPC_AUTH_MAXFLAVOR) { 9217 err = nfs4_lookup_root_sec(server, fhandle, 9218 info, flavor); 9219 if (!err) 9220 break; 9221 } 9222 } 9223 9224 if (flavor == RPC_AUTH_MAXFLAVOR) 9225 err = -EPERM; 9226 9227 out_freepage: 9228 put_page(page); 9229 if (err == -EACCES) 9230 return -EPERM; 9231 out: 9232 return err; 9233 } 9234 9235 static int _nfs41_test_stateid(struct nfs_server *server, 9236 nfs4_stateid *stateid, 9237 struct rpc_cred *cred) 9238 { 9239 int status; 9240 struct nfs41_test_stateid_args args = { 9241 .stateid = stateid, 9242 }; 9243 struct nfs41_test_stateid_res res; 9244 struct rpc_message msg = { 9245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 9246 .rpc_argp = &args, 9247 .rpc_resp = &res, 9248 .rpc_cred = cred, 9249 }; 9250 struct rpc_clnt *rpc_client = server->client; 9251 9252 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9253 &rpc_client, &msg); 9254 9255 dprintk("NFS call test_stateid %p\n", stateid); 9256 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 9257 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 9258 &args.seq_args, &res.seq_res); 9259 if (status != NFS_OK) { 9260 dprintk("NFS reply test_stateid: failed, %d\n", status); 9261 return status; 9262 } 9263 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 9264 return -res.status; 9265 } 9266 9267 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 9268 int err, struct nfs4_exception *exception) 9269 { 9270 exception->retry = 0; 9271 switch(err) { 9272 case -NFS4ERR_DELAY: 9273 case -NFS4ERR_RETRY_UNCACHED_REP: 9274 nfs4_handle_exception(server, err, exception); 9275 break; 9276 case -NFS4ERR_BADSESSION: 9277 case -NFS4ERR_BADSLOT: 9278 case -NFS4ERR_BAD_HIGH_SLOT: 9279 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9280 case -NFS4ERR_DEADSESSION: 9281 nfs4_do_handle_exception(server, err, exception); 9282 } 9283 } 9284 9285 /** 9286 * nfs41_test_stateid - perform a TEST_STATEID operation 9287 * 9288 * @server: server / transport on which to perform the operation 9289 * @stateid: state ID to test 9290 * @cred: credential 9291 * 9292 * Returns NFS_OK if the server recognizes that "stateid" is valid. 9293 * Otherwise a negative NFS4ERR value is returned if the operation 9294 * failed or the state ID is not currently valid. 9295 */ 9296 static int nfs41_test_stateid(struct nfs_server *server, 9297 nfs4_stateid *stateid, 9298 struct rpc_cred *cred) 9299 { 9300 struct nfs4_exception exception = { }; 9301 int err; 9302 do { 9303 err = _nfs41_test_stateid(server, stateid, cred); 9304 nfs4_handle_delay_or_session_error(server, err, &exception); 9305 } while (exception.retry); 9306 return err; 9307 } 9308 9309 struct nfs_free_stateid_data { 9310 struct nfs_server *server; 9311 struct nfs41_free_stateid_args args; 9312 struct nfs41_free_stateid_res res; 9313 }; 9314 9315 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 9316 { 9317 struct nfs_free_stateid_data *data = calldata; 9318 nfs4_setup_sequence(data->server->nfs_client, 9319 &data->args.seq_args, 9320 &data->res.seq_res, 9321 task); 9322 } 9323 9324 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 9325 { 9326 struct nfs_free_stateid_data *data = calldata; 9327 9328 nfs41_sequence_done(task, &data->res.seq_res); 9329 9330 switch (task->tk_status) { 9331 case -NFS4ERR_DELAY: 9332 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 9333 rpc_restart_call_prepare(task); 9334 } 9335 } 9336 9337 static void nfs41_free_stateid_release(void *calldata) 9338 { 9339 kfree(calldata); 9340 } 9341 9342 static const struct rpc_call_ops nfs41_free_stateid_ops = { 9343 .rpc_call_prepare = nfs41_free_stateid_prepare, 9344 .rpc_call_done = nfs41_free_stateid_done, 9345 .rpc_release = nfs41_free_stateid_release, 9346 }; 9347 9348 /** 9349 * nfs41_free_stateid - perform a FREE_STATEID operation 9350 * 9351 * @server: server / transport on which to perform the operation 9352 * @stateid: state ID to release 9353 * @cred: credential 9354 * @is_recovery: set to true if this call needs to be privileged 9355 * 9356 * Note: this function is always asynchronous. 9357 */ 9358 static int nfs41_free_stateid(struct nfs_server *server, 9359 const nfs4_stateid *stateid, 9360 struct rpc_cred *cred, 9361 bool privileged) 9362 { 9363 struct rpc_message msg = { 9364 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 9365 .rpc_cred = cred, 9366 }; 9367 struct rpc_task_setup task_setup = { 9368 .rpc_client = server->client, 9369 .rpc_message = &msg, 9370 .callback_ops = &nfs41_free_stateid_ops, 9371 .flags = RPC_TASK_ASYNC, 9372 }; 9373 struct nfs_free_stateid_data *data; 9374 struct rpc_task *task; 9375 9376 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9377 &task_setup.rpc_client, &msg); 9378 9379 dprintk("NFS call free_stateid %p\n", stateid); 9380 data = kmalloc(sizeof(*data), GFP_NOFS); 9381 if (!data) 9382 return -ENOMEM; 9383 data->server = server; 9384 nfs4_stateid_copy(&data->args.stateid, stateid); 9385 9386 task_setup.callback_data = data; 9387 9388 msg.rpc_argp = &data->args; 9389 msg.rpc_resp = &data->res; 9390 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 9391 task = rpc_run_task(&task_setup); 9392 if (IS_ERR(task)) 9393 return PTR_ERR(task); 9394 rpc_put_task(task); 9395 return 0; 9396 } 9397 9398 static void 9399 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 9400 { 9401 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 9402 9403 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 9404 nfs4_free_lock_state(server, lsp); 9405 } 9406 9407 static bool nfs41_match_stateid(const nfs4_stateid *s1, 9408 const nfs4_stateid *s2) 9409 { 9410 if (s1->type != s2->type) 9411 return false; 9412 9413 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 9414 return false; 9415 9416 if (s1->seqid == s2->seqid) 9417 return true; 9418 9419 return s1->seqid == 0 || s2->seqid == 0; 9420 } 9421 9422 #endif /* CONFIG_NFS_V4_1 */ 9423 9424 static bool nfs4_match_stateid(const nfs4_stateid *s1, 9425 const nfs4_stateid *s2) 9426 { 9427 return nfs4_stateid_match(s1, s2); 9428 } 9429 9430 9431 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 9432 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9433 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9434 .recover_open = nfs4_open_reclaim, 9435 .recover_lock = nfs4_lock_reclaim, 9436 .establish_clid = nfs4_init_clientid, 9437 .detect_trunking = nfs40_discover_server_trunking, 9438 }; 9439 9440 #if defined(CONFIG_NFS_V4_1) 9441 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 9442 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9443 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9444 .recover_open = nfs4_open_reclaim, 9445 .recover_lock = nfs4_lock_reclaim, 9446 .establish_clid = nfs41_init_clientid, 9447 .reclaim_complete = nfs41_proc_reclaim_complete, 9448 .detect_trunking = nfs41_discover_server_trunking, 9449 }; 9450 #endif /* CONFIG_NFS_V4_1 */ 9451 9452 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 9453 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9454 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9455 .recover_open = nfs40_open_expired, 9456 .recover_lock = nfs4_lock_expired, 9457 .establish_clid = nfs4_init_clientid, 9458 }; 9459 9460 #if defined(CONFIG_NFS_V4_1) 9461 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 9462 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9463 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9464 .recover_open = nfs41_open_expired, 9465 .recover_lock = nfs41_lock_expired, 9466 .establish_clid = nfs41_init_clientid, 9467 }; 9468 #endif /* CONFIG_NFS_V4_1 */ 9469 9470 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 9471 .sched_state_renewal = nfs4_proc_async_renew, 9472 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 9473 .renew_lease = nfs4_proc_renew, 9474 }; 9475 9476 #if defined(CONFIG_NFS_V4_1) 9477 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 9478 .sched_state_renewal = nfs41_proc_async_sequence, 9479 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 9480 .renew_lease = nfs4_proc_sequence, 9481 }; 9482 #endif 9483 9484 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 9485 .get_locations = _nfs40_proc_get_locations, 9486 .fsid_present = _nfs40_proc_fsid_present, 9487 }; 9488 9489 #if defined(CONFIG_NFS_V4_1) 9490 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 9491 .get_locations = _nfs41_proc_get_locations, 9492 .fsid_present = _nfs41_proc_fsid_present, 9493 }; 9494 #endif /* CONFIG_NFS_V4_1 */ 9495 9496 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 9497 .minor_version = 0, 9498 .init_caps = NFS_CAP_READDIRPLUS 9499 | NFS_CAP_ATOMIC_OPEN 9500 | NFS_CAP_POSIX_LOCK, 9501 .init_client = nfs40_init_client, 9502 .shutdown_client = nfs40_shutdown_client, 9503 .match_stateid = nfs4_match_stateid, 9504 .find_root_sec = nfs4_find_root_sec, 9505 .free_lock_state = nfs4_release_lockowner, 9506 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 9507 .alloc_seqid = nfs_alloc_seqid, 9508 .call_sync_ops = &nfs40_call_sync_ops, 9509 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 9510 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 9511 .state_renewal_ops = &nfs40_state_renewal_ops, 9512 .mig_recovery_ops = &nfs40_mig_recovery_ops, 9513 }; 9514 9515 #if defined(CONFIG_NFS_V4_1) 9516 static struct nfs_seqid * 9517 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 9518 { 9519 return NULL; 9520 } 9521 9522 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 9523 .minor_version = 1, 9524 .init_caps = NFS_CAP_READDIRPLUS 9525 | NFS_CAP_ATOMIC_OPEN 9526 | NFS_CAP_POSIX_LOCK 9527 | NFS_CAP_STATEID_NFSV41 9528 | NFS_CAP_ATOMIC_OPEN_V1 9529 | NFS_CAP_LGOPEN, 9530 .init_client = nfs41_init_client, 9531 .shutdown_client = nfs41_shutdown_client, 9532 .match_stateid = nfs41_match_stateid, 9533 .find_root_sec = nfs41_find_root_sec, 9534 .free_lock_state = nfs41_free_lock_state, 9535 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9536 .alloc_seqid = nfs_alloc_no_seqid, 9537 .session_trunk = nfs4_test_session_trunk, 9538 .call_sync_ops = &nfs41_call_sync_ops, 9539 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9540 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9541 .state_renewal_ops = &nfs41_state_renewal_ops, 9542 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9543 }; 9544 #endif 9545 9546 #if defined(CONFIG_NFS_V4_2) 9547 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 9548 .minor_version = 2, 9549 .init_caps = NFS_CAP_READDIRPLUS 9550 | NFS_CAP_ATOMIC_OPEN 9551 | NFS_CAP_POSIX_LOCK 9552 | NFS_CAP_STATEID_NFSV41 9553 | NFS_CAP_ATOMIC_OPEN_V1 9554 | NFS_CAP_LGOPEN 9555 | NFS_CAP_ALLOCATE 9556 | NFS_CAP_COPY 9557 | NFS_CAP_DEALLOCATE 9558 | NFS_CAP_SEEK 9559 | NFS_CAP_LAYOUTSTATS 9560 | NFS_CAP_CLONE, 9561 .init_client = nfs41_init_client, 9562 .shutdown_client = nfs41_shutdown_client, 9563 .match_stateid = nfs41_match_stateid, 9564 .find_root_sec = nfs41_find_root_sec, 9565 .free_lock_state = nfs41_free_lock_state, 9566 .call_sync_ops = &nfs41_call_sync_ops, 9567 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9568 .alloc_seqid = nfs_alloc_no_seqid, 9569 .session_trunk = nfs4_test_session_trunk, 9570 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9571 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9572 .state_renewal_ops = &nfs41_state_renewal_ops, 9573 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9574 }; 9575 #endif 9576 9577 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 9578 [0] = &nfs_v4_0_minor_ops, 9579 #if defined(CONFIG_NFS_V4_1) 9580 [1] = &nfs_v4_1_minor_ops, 9581 #endif 9582 #if defined(CONFIG_NFS_V4_2) 9583 [2] = &nfs_v4_2_minor_ops, 9584 #endif 9585 }; 9586 9587 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 9588 { 9589 ssize_t error, error2; 9590 9591 error = generic_listxattr(dentry, list, size); 9592 if (error < 0) 9593 return error; 9594 if (list) { 9595 list += error; 9596 size -= error; 9597 } 9598 9599 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 9600 if (error2 < 0) 9601 return error2; 9602 return error + error2; 9603 } 9604 9605 static const struct inode_operations nfs4_dir_inode_operations = { 9606 .create = nfs_create, 9607 .lookup = nfs_lookup, 9608 .atomic_open = nfs_atomic_open, 9609 .link = nfs_link, 9610 .unlink = nfs_unlink, 9611 .symlink = nfs_symlink, 9612 .mkdir = nfs_mkdir, 9613 .rmdir = nfs_rmdir, 9614 .mknod = nfs_mknod, 9615 .rename = nfs_rename, 9616 .permission = nfs_permission, 9617 .getattr = nfs_getattr, 9618 .setattr = nfs_setattr, 9619 .listxattr = nfs4_listxattr, 9620 }; 9621 9622 static const struct inode_operations nfs4_file_inode_operations = { 9623 .permission = nfs_permission, 9624 .getattr = nfs_getattr, 9625 .setattr = nfs_setattr, 9626 .listxattr = nfs4_listxattr, 9627 }; 9628 9629 const struct nfs_rpc_ops nfs_v4_clientops = { 9630 .version = 4, /* protocol version */ 9631 .dentry_ops = &nfs4_dentry_operations, 9632 .dir_inode_ops = &nfs4_dir_inode_operations, 9633 .file_inode_ops = &nfs4_file_inode_operations, 9634 .file_ops = &nfs4_file_operations, 9635 .getroot = nfs4_proc_get_root, 9636 .submount = nfs4_submount, 9637 .try_mount = nfs4_try_mount, 9638 .getattr = nfs4_proc_getattr, 9639 .setattr = nfs4_proc_setattr, 9640 .lookup = nfs4_proc_lookup, 9641 .lookupp = nfs4_proc_lookupp, 9642 .access = nfs4_proc_access, 9643 .readlink = nfs4_proc_readlink, 9644 .create = nfs4_proc_create, 9645 .remove = nfs4_proc_remove, 9646 .unlink_setup = nfs4_proc_unlink_setup, 9647 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 9648 .unlink_done = nfs4_proc_unlink_done, 9649 .rename_setup = nfs4_proc_rename_setup, 9650 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 9651 .rename_done = nfs4_proc_rename_done, 9652 .link = nfs4_proc_link, 9653 .symlink = nfs4_proc_symlink, 9654 .mkdir = nfs4_proc_mkdir, 9655 .rmdir = nfs4_proc_rmdir, 9656 .readdir = nfs4_proc_readdir, 9657 .mknod = nfs4_proc_mknod, 9658 .statfs = nfs4_proc_statfs, 9659 .fsinfo = nfs4_proc_fsinfo, 9660 .pathconf = nfs4_proc_pathconf, 9661 .set_capabilities = nfs4_server_capabilities, 9662 .decode_dirent = nfs4_decode_dirent, 9663 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 9664 .read_setup = nfs4_proc_read_setup, 9665 .read_done = nfs4_read_done, 9666 .write_setup = nfs4_proc_write_setup, 9667 .write_done = nfs4_write_done, 9668 .commit_setup = nfs4_proc_commit_setup, 9669 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 9670 .commit_done = nfs4_commit_done, 9671 .lock = nfs4_proc_lock, 9672 .clear_acl_cache = nfs4_zap_acl_attr, 9673 .close_context = nfs4_close_context, 9674 .open_context = nfs4_atomic_open, 9675 .have_delegation = nfs4_have_delegation, 9676 .alloc_client = nfs4_alloc_client, 9677 .init_client = nfs4_init_client, 9678 .free_client = nfs4_free_client, 9679 .create_server = nfs4_create_server, 9680 .clone_server = nfs_clone_server, 9681 }; 9682 9683 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 9684 .name = XATTR_NAME_NFSV4_ACL, 9685 .list = nfs4_xattr_list_nfs4_acl, 9686 .get = nfs4_xattr_get_nfs4_acl, 9687 .set = nfs4_xattr_set_nfs4_acl, 9688 }; 9689 9690 const struct xattr_handler *nfs4_xattr_handlers[] = { 9691 &nfs4_xattr_nfs4_acl_handler, 9692 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 9693 &nfs4_xattr_nfs4_label_handler, 9694 #endif 9695 NULL 9696 }; 9697 9698 /* 9699 * Local variables: 9700 * c-basic-offset: 8 9701 * End: 9702 */ 9703