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_POLL_RETRY_MIN (HZ/10) 75 #define NFS4_POLL_RETRY_MAX (15*HZ) 76 77 /* file attributes which can be mapped to nfs attributes */ 78 #define NFS4_VALID_ATTRS (ATTR_MODE \ 79 | ATTR_UID \ 80 | ATTR_GID \ 81 | ATTR_SIZE \ 82 | ATTR_ATIME \ 83 | ATTR_MTIME \ 84 | ATTR_CTIME \ 85 | ATTR_ATIME_SET \ 86 | ATTR_MTIME_SET) 87 88 struct nfs4_opendata; 89 static int _nfs4_proc_open(struct nfs4_opendata *data); 90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label); 94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label); 95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 96 struct nfs_fattr *fattr, struct iattr *sattr, 97 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 98 struct nfs4_label *olabel); 99 #ifdef CONFIG_NFS_V4_1 100 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 101 struct rpc_cred *cred, 102 struct nfs4_slot *slot, 103 bool is_privileged); 104 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 105 struct rpc_cred *); 106 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 107 struct rpc_cred *, bool); 108 #endif 109 110 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 111 static inline struct nfs4_label * 112 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 113 struct iattr *sattr, struct nfs4_label *label) 114 { 115 int err; 116 117 if (label == NULL) 118 return NULL; 119 120 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 121 return NULL; 122 123 err = security_dentry_init_security(dentry, sattr->ia_mode, 124 &dentry->d_name, (void **)&label->label, &label->len); 125 if (err == 0) 126 return label; 127 128 return NULL; 129 } 130 static inline void 131 nfs4_label_release_security(struct nfs4_label *label) 132 { 133 if (label) 134 security_release_secctx(label->label, label->len); 135 } 136 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 137 { 138 if (label) 139 return server->attr_bitmask; 140 141 return server->attr_bitmask_nl; 142 } 143 #else 144 static inline struct nfs4_label * 145 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 146 struct iattr *sattr, struct nfs4_label *l) 147 { return NULL; } 148 static inline void 149 nfs4_label_release_security(struct nfs4_label *label) 150 { return; } 151 static inline u32 * 152 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 153 { return server->attr_bitmask; } 154 #endif 155 156 /* Prevent leaks of NFSv4 errors into userland */ 157 static int nfs4_map_errors(int err) 158 { 159 if (err >= -1000) 160 return err; 161 switch (err) { 162 case -NFS4ERR_RESOURCE: 163 case -NFS4ERR_LAYOUTTRYLATER: 164 case -NFS4ERR_RECALLCONFLICT: 165 return -EREMOTEIO; 166 case -NFS4ERR_WRONGSEC: 167 case -NFS4ERR_WRONG_CRED: 168 return -EPERM; 169 case -NFS4ERR_BADOWNER: 170 case -NFS4ERR_BADNAME: 171 return -EINVAL; 172 case -NFS4ERR_SHARE_DENIED: 173 return -EACCES; 174 case -NFS4ERR_MINOR_VERS_MISMATCH: 175 return -EPROTONOSUPPORT; 176 case -NFS4ERR_FILE_OPEN: 177 return -EBUSY; 178 default: 179 dprintk("%s could not handle NFSv4 error %d\n", 180 __func__, -err); 181 break; 182 } 183 return -EIO; 184 } 185 186 /* 187 * This is our standard bitmap for GETATTR requests. 188 */ 189 const u32 nfs4_fattr_bitmap[3] = { 190 FATTR4_WORD0_TYPE 191 | FATTR4_WORD0_CHANGE 192 | FATTR4_WORD0_SIZE 193 | FATTR4_WORD0_FSID 194 | FATTR4_WORD0_FILEID, 195 FATTR4_WORD1_MODE 196 | FATTR4_WORD1_NUMLINKS 197 | FATTR4_WORD1_OWNER 198 | FATTR4_WORD1_OWNER_GROUP 199 | FATTR4_WORD1_RAWDEV 200 | FATTR4_WORD1_SPACE_USED 201 | FATTR4_WORD1_TIME_ACCESS 202 | FATTR4_WORD1_TIME_METADATA 203 | FATTR4_WORD1_TIME_MODIFY 204 | FATTR4_WORD1_MOUNTED_ON_FILEID, 205 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 206 FATTR4_WORD2_SECURITY_LABEL 207 #endif 208 }; 209 210 static const u32 nfs4_pnfs_open_bitmap[3] = { 211 FATTR4_WORD0_TYPE 212 | FATTR4_WORD0_CHANGE 213 | FATTR4_WORD0_SIZE 214 | FATTR4_WORD0_FSID 215 | FATTR4_WORD0_FILEID, 216 FATTR4_WORD1_MODE 217 | FATTR4_WORD1_NUMLINKS 218 | FATTR4_WORD1_OWNER 219 | FATTR4_WORD1_OWNER_GROUP 220 | FATTR4_WORD1_RAWDEV 221 | FATTR4_WORD1_SPACE_USED 222 | FATTR4_WORD1_TIME_ACCESS 223 | FATTR4_WORD1_TIME_METADATA 224 | FATTR4_WORD1_TIME_MODIFY, 225 FATTR4_WORD2_MDSTHRESHOLD 226 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 227 | FATTR4_WORD2_SECURITY_LABEL 228 #endif 229 }; 230 231 static const u32 nfs4_open_noattr_bitmap[3] = { 232 FATTR4_WORD0_TYPE 233 | FATTR4_WORD0_FILEID, 234 }; 235 236 const u32 nfs4_statfs_bitmap[3] = { 237 FATTR4_WORD0_FILES_AVAIL 238 | FATTR4_WORD0_FILES_FREE 239 | FATTR4_WORD0_FILES_TOTAL, 240 FATTR4_WORD1_SPACE_AVAIL 241 | FATTR4_WORD1_SPACE_FREE 242 | FATTR4_WORD1_SPACE_TOTAL 243 }; 244 245 const u32 nfs4_pathconf_bitmap[3] = { 246 FATTR4_WORD0_MAXLINK 247 | FATTR4_WORD0_MAXNAME, 248 0 249 }; 250 251 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 252 | FATTR4_WORD0_MAXREAD 253 | FATTR4_WORD0_MAXWRITE 254 | FATTR4_WORD0_LEASE_TIME, 255 FATTR4_WORD1_TIME_DELTA 256 | FATTR4_WORD1_FS_LAYOUT_TYPES, 257 FATTR4_WORD2_LAYOUT_BLKSIZE 258 | FATTR4_WORD2_CLONE_BLKSIZE 259 }; 260 261 const u32 nfs4_fs_locations_bitmap[3] = { 262 FATTR4_WORD0_CHANGE 263 | FATTR4_WORD0_SIZE 264 | FATTR4_WORD0_FSID 265 | FATTR4_WORD0_FILEID 266 | FATTR4_WORD0_FS_LOCATIONS, 267 FATTR4_WORD1_OWNER 268 | FATTR4_WORD1_OWNER_GROUP 269 | FATTR4_WORD1_RAWDEV 270 | FATTR4_WORD1_SPACE_USED 271 | FATTR4_WORD1_TIME_ACCESS 272 | FATTR4_WORD1_TIME_METADATA 273 | FATTR4_WORD1_TIME_MODIFY 274 | FATTR4_WORD1_MOUNTED_ON_FILEID, 275 }; 276 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 278 struct nfs4_readdir_arg *readdir) 279 { 280 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 281 __be32 *start, *p; 282 283 if (cookie > 2) { 284 readdir->cookie = cookie; 285 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 286 return; 287 } 288 289 readdir->cookie = 0; 290 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 291 if (cookie == 2) 292 return; 293 294 /* 295 * NFSv4 servers do not return entries for '.' and '..' 296 * Therefore, we fake these entries here. We let '.' 297 * have cookie 0 and '..' have cookie 1. Note that 298 * when talking to the server, we always send cookie 0 299 * instead of 1 or 2. 300 */ 301 start = p = kmap_atomic(*readdir->pages); 302 303 if (cookie == 0) { 304 *p++ = xdr_one; /* next */ 305 *p++ = xdr_zero; /* cookie, first word */ 306 *p++ = xdr_one; /* cookie, second word */ 307 *p++ = xdr_one; /* entry len */ 308 memcpy(p, ".\0\0\0", 4); /* entry */ 309 p++; 310 *p++ = xdr_one; /* bitmap length */ 311 *p++ = htonl(attrs); /* bitmap */ 312 *p++ = htonl(12); /* attribute buffer length */ 313 *p++ = htonl(NF4DIR); 314 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 315 } 316 317 *p++ = xdr_one; /* next */ 318 *p++ = xdr_zero; /* cookie, first word */ 319 *p++ = xdr_two; /* cookie, second word */ 320 *p++ = xdr_two; /* entry len */ 321 memcpy(p, "..\0\0", 4); /* entry */ 322 p++; 323 *p++ = xdr_one; /* bitmap length */ 324 *p++ = htonl(attrs); /* bitmap */ 325 *p++ = htonl(12); /* attribute buffer length */ 326 *p++ = htonl(NF4DIR); 327 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 328 329 readdir->pgbase = (char *)p - (char *)start; 330 readdir->count -= readdir->pgbase; 331 kunmap_atomic(start); 332 } 333 334 static void nfs4_test_and_free_stateid(struct nfs_server *server, 335 nfs4_stateid *stateid, 336 struct rpc_cred *cred) 337 { 338 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 339 340 ops->test_and_free_expired(server, stateid, cred); 341 } 342 343 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 344 nfs4_stateid *stateid, 345 struct rpc_cred *cred) 346 { 347 stateid->type = NFS4_REVOKED_STATEID_TYPE; 348 nfs4_test_and_free_stateid(server, stateid, cred); 349 } 350 351 static void nfs4_free_revoked_stateid(struct nfs_server *server, 352 const nfs4_stateid *stateid, 353 struct rpc_cred *cred) 354 { 355 nfs4_stateid tmp; 356 357 nfs4_stateid_copy(&tmp, stateid); 358 __nfs4_free_revoked_stateid(server, &tmp, cred); 359 } 360 361 static long nfs4_update_delay(long *timeout) 362 { 363 long ret; 364 if (!timeout) 365 return NFS4_POLL_RETRY_MAX; 366 if (*timeout <= 0) 367 *timeout = NFS4_POLL_RETRY_MIN; 368 if (*timeout > NFS4_POLL_RETRY_MAX) 369 *timeout = NFS4_POLL_RETRY_MAX; 370 ret = *timeout; 371 *timeout <<= 1; 372 return ret; 373 } 374 375 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 376 { 377 int res = 0; 378 379 might_sleep(); 380 381 freezable_schedule_timeout_killable_unsafe( 382 nfs4_update_delay(timeout)); 383 if (fatal_signal_pending(current)) 384 res = -ERESTARTSYS; 385 return res; 386 } 387 388 /* This is the error handling routine for processes that are allowed 389 * to sleep. 390 */ 391 static int nfs4_do_handle_exception(struct nfs_server *server, 392 int errorcode, struct nfs4_exception *exception) 393 { 394 struct nfs_client *clp = server->nfs_client; 395 struct nfs4_state *state = exception->state; 396 const nfs4_stateid *stateid = exception->stateid; 397 struct inode *inode = exception->inode; 398 int ret = errorcode; 399 400 exception->delay = 0; 401 exception->recovering = 0; 402 exception->retry = 0; 403 404 if (stateid == NULL && state != NULL) 405 stateid = &state->stateid; 406 407 switch(errorcode) { 408 case 0: 409 return 0; 410 case -NFS4ERR_DELEG_REVOKED: 411 case -NFS4ERR_ADMIN_REVOKED: 412 case -NFS4ERR_EXPIRED: 413 case -NFS4ERR_BAD_STATEID: 414 if (inode != NULL && stateid != NULL) { 415 nfs_inode_find_state_and_recover(inode, 416 stateid); 417 goto wait_on_recovery; 418 } 419 case -NFS4ERR_OPENMODE: 420 if (inode) { 421 int err; 422 423 err = nfs_async_inode_return_delegation(inode, 424 stateid); 425 if (err == 0) 426 goto wait_on_recovery; 427 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 428 exception->retry = 1; 429 break; 430 } 431 } 432 if (state == NULL) 433 break; 434 ret = nfs4_schedule_stateid_recovery(server, state); 435 if (ret < 0) 436 break; 437 goto wait_on_recovery; 438 case -NFS4ERR_STALE_STATEID: 439 case -NFS4ERR_STALE_CLIENTID: 440 nfs4_schedule_lease_recovery(clp); 441 goto wait_on_recovery; 442 case -NFS4ERR_MOVED: 443 ret = nfs4_schedule_migration_recovery(server); 444 if (ret < 0) 445 break; 446 goto wait_on_recovery; 447 case -NFS4ERR_LEASE_MOVED: 448 nfs4_schedule_lease_moved_recovery(clp); 449 goto wait_on_recovery; 450 #if defined(CONFIG_NFS_V4_1) 451 case -NFS4ERR_BADSESSION: 452 case -NFS4ERR_BADSLOT: 453 case -NFS4ERR_BAD_HIGH_SLOT: 454 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 455 case -NFS4ERR_DEADSESSION: 456 case -NFS4ERR_SEQ_FALSE_RETRY: 457 case -NFS4ERR_SEQ_MISORDERED: 458 dprintk("%s ERROR: %d Reset session\n", __func__, 459 errorcode); 460 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 461 goto wait_on_recovery; 462 #endif /* defined(CONFIG_NFS_V4_1) */ 463 case -NFS4ERR_FILE_OPEN: 464 if (exception->timeout > HZ) { 465 /* We have retried a decent amount, time to 466 * fail 467 */ 468 ret = -EBUSY; 469 break; 470 } 471 case -NFS4ERR_DELAY: 472 nfs_inc_server_stats(server, NFSIOS_DELAY); 473 case -NFS4ERR_GRACE: 474 case -NFS4ERR_LAYOUTTRYLATER: 475 case -NFS4ERR_RECALLCONFLICT: 476 exception->delay = 1; 477 return 0; 478 479 case -NFS4ERR_RETRY_UNCACHED_REP: 480 case -NFS4ERR_OLD_STATEID: 481 exception->retry = 1; 482 break; 483 case -NFS4ERR_BADOWNER: 484 /* The following works around a Linux server bug! */ 485 case -NFS4ERR_BADNAME: 486 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 487 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 488 exception->retry = 1; 489 printk(KERN_WARNING "NFS: v4 server %s " 490 "does not accept raw " 491 "uid/gids. " 492 "Reenabling the idmapper.\n", 493 server->nfs_client->cl_hostname); 494 } 495 } 496 /* We failed to handle the error */ 497 return nfs4_map_errors(ret); 498 wait_on_recovery: 499 exception->recovering = 1; 500 return 0; 501 } 502 503 /* This is the error handling routine for processes that are allowed 504 * to sleep. 505 */ 506 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 507 { 508 struct nfs_client *clp = server->nfs_client; 509 int ret; 510 511 ret = nfs4_do_handle_exception(server, errorcode, exception); 512 if (exception->delay) { 513 ret = nfs4_delay(server->client, &exception->timeout); 514 goto out_retry; 515 } 516 if (exception->recovering) { 517 ret = nfs4_wait_clnt_recover(clp); 518 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 519 return -EIO; 520 goto out_retry; 521 } 522 return ret; 523 out_retry: 524 if (ret == 0) 525 exception->retry = 1; 526 return ret; 527 } 528 529 static int 530 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 531 int errorcode, struct nfs4_exception *exception) 532 { 533 struct nfs_client *clp = server->nfs_client; 534 int ret; 535 536 ret = nfs4_do_handle_exception(server, errorcode, exception); 537 if (exception->delay) { 538 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 539 goto out_retry; 540 } 541 if (exception->recovering) { 542 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 543 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 544 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 545 goto out_retry; 546 } 547 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 548 ret = -EIO; 549 return ret; 550 out_retry: 551 if (ret == 0) 552 exception->retry = 1; 553 return ret; 554 } 555 556 static int 557 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 558 struct nfs4_state *state, long *timeout) 559 { 560 struct nfs4_exception exception = { 561 .state = state, 562 }; 563 564 if (task->tk_status >= 0) 565 return 0; 566 if (timeout) 567 exception.timeout = *timeout; 568 task->tk_status = nfs4_async_handle_exception(task, server, 569 task->tk_status, 570 &exception); 571 if (exception.delay && timeout) 572 *timeout = exception.timeout; 573 if (exception.retry) 574 return -EAGAIN; 575 return 0; 576 } 577 578 /* 579 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 580 * or 'false' otherwise. 581 */ 582 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 583 { 584 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 585 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 586 } 587 588 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 589 { 590 spin_lock(&clp->cl_lock); 591 if (time_before(clp->cl_last_renewal,timestamp)) 592 clp->cl_last_renewal = timestamp; 593 spin_unlock(&clp->cl_lock); 594 } 595 596 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 597 { 598 struct nfs_client *clp = server->nfs_client; 599 600 if (!nfs4_has_session(clp)) 601 do_renew_lease(clp, timestamp); 602 } 603 604 struct nfs4_call_sync_data { 605 const struct nfs_server *seq_server; 606 struct nfs4_sequence_args *seq_args; 607 struct nfs4_sequence_res *seq_res; 608 }; 609 610 void nfs4_init_sequence(struct nfs4_sequence_args *args, 611 struct nfs4_sequence_res *res, int cache_reply, 612 int privileged) 613 { 614 args->sa_slot = NULL; 615 args->sa_cache_this = cache_reply; 616 args->sa_privileged = privileged; 617 618 res->sr_slot = NULL; 619 } 620 621 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 622 { 623 struct nfs4_slot *slot = res->sr_slot; 624 struct nfs4_slot_table *tbl; 625 626 tbl = slot->table; 627 spin_lock(&tbl->slot_tbl_lock); 628 if (!nfs41_wake_and_assign_slot(tbl, slot)) 629 nfs4_free_slot(tbl, slot); 630 spin_unlock(&tbl->slot_tbl_lock); 631 632 res->sr_slot = NULL; 633 } 634 635 static int nfs40_sequence_done(struct rpc_task *task, 636 struct nfs4_sequence_res *res) 637 { 638 if (res->sr_slot != NULL) 639 nfs40_sequence_free_slot(res); 640 return 1; 641 } 642 643 #if defined(CONFIG_NFS_V4_1) 644 645 static void nfs41_release_slot(struct nfs4_slot *slot) 646 { 647 struct nfs4_session *session; 648 struct nfs4_slot_table *tbl; 649 bool send_new_highest_used_slotid = false; 650 651 if (!slot) 652 return; 653 tbl = slot->table; 654 session = tbl->session; 655 656 /* Bump the slot sequence number */ 657 if (slot->seq_done) 658 slot->seq_nr++; 659 slot->seq_done = 0; 660 661 spin_lock(&tbl->slot_tbl_lock); 662 /* Be nice to the server: try to ensure that the last transmitted 663 * value for highest_user_slotid <= target_highest_slotid 664 */ 665 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 666 send_new_highest_used_slotid = true; 667 668 if (nfs41_wake_and_assign_slot(tbl, slot)) { 669 send_new_highest_used_slotid = false; 670 goto out_unlock; 671 } 672 nfs4_free_slot(tbl, slot); 673 674 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 675 send_new_highest_used_slotid = false; 676 out_unlock: 677 spin_unlock(&tbl->slot_tbl_lock); 678 if (send_new_highest_used_slotid) 679 nfs41_notify_server(session->clp); 680 if (waitqueue_active(&tbl->slot_waitq)) 681 wake_up_all(&tbl->slot_waitq); 682 } 683 684 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 685 { 686 nfs41_release_slot(res->sr_slot); 687 res->sr_slot = NULL; 688 } 689 690 static int nfs41_sequence_process(struct rpc_task *task, 691 struct nfs4_sequence_res *res) 692 { 693 struct nfs4_session *session; 694 struct nfs4_slot *slot = res->sr_slot; 695 struct nfs_client *clp; 696 bool interrupted = false; 697 int ret = 1; 698 699 if (slot == NULL) 700 goto out_noaction; 701 /* don't increment the sequence number if the task wasn't sent */ 702 if (!RPC_WAS_SENT(task)) 703 goto out; 704 705 session = slot->table->session; 706 707 if (slot->interrupted) { 708 if (res->sr_status != -NFS4ERR_DELAY) 709 slot->interrupted = 0; 710 interrupted = true; 711 } 712 713 trace_nfs4_sequence_done(session, res); 714 /* Check the SEQUENCE operation status */ 715 switch (res->sr_status) { 716 case 0: 717 /* Update the slot's sequence and clientid lease timer */ 718 slot->seq_done = 1; 719 clp = session->clp; 720 do_renew_lease(clp, res->sr_timestamp); 721 /* Check sequence flags */ 722 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 723 !!slot->privileged); 724 nfs41_update_target_slotid(slot->table, slot, res); 725 break; 726 case 1: 727 /* 728 * sr_status remains 1 if an RPC level error occurred. 729 * The server may or may not have processed the sequence 730 * operation.. 731 * Mark the slot as having hosted an interrupted RPC call. 732 */ 733 slot->interrupted = 1; 734 goto out; 735 case -NFS4ERR_DELAY: 736 /* The server detected a resend of the RPC call and 737 * returned NFS4ERR_DELAY as per Section 2.10.6.2 738 * of RFC5661. 739 */ 740 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 741 __func__, 742 slot->slot_nr, 743 slot->seq_nr); 744 goto out_retry; 745 case -NFS4ERR_BADSLOT: 746 /* 747 * The slot id we used was probably retired. Try again 748 * using a different slot id. 749 */ 750 if (slot->seq_nr < slot->table->target_highest_slotid) 751 goto session_recover; 752 goto retry_nowait; 753 case -NFS4ERR_SEQ_MISORDERED: 754 /* 755 * Was the last operation on this sequence interrupted? 756 * If so, retry after bumping the sequence number. 757 */ 758 if (interrupted) 759 goto retry_new_seq; 760 /* 761 * Could this slot have been previously retired? 762 * If so, then the server may be expecting seq_nr = 1! 763 */ 764 if (slot->seq_nr != 1) { 765 slot->seq_nr = 1; 766 goto retry_nowait; 767 } 768 goto session_recover; 769 case -NFS4ERR_SEQ_FALSE_RETRY: 770 if (interrupted) 771 goto retry_new_seq; 772 goto session_recover; 773 default: 774 /* Just update the slot sequence no. */ 775 slot->seq_done = 1; 776 } 777 out: 778 /* The session may be reset by one of the error handlers. */ 779 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 780 out_noaction: 781 return ret; 782 session_recover: 783 nfs4_schedule_session_recovery(session, res->sr_status); 784 goto retry_nowait; 785 retry_new_seq: 786 ++slot->seq_nr; 787 retry_nowait: 788 if (rpc_restart_call_prepare(task)) { 789 nfs41_sequence_free_slot(res); 790 task->tk_status = 0; 791 ret = 0; 792 } 793 goto out; 794 out_retry: 795 if (!rpc_restart_call(task)) 796 goto out; 797 rpc_delay(task, NFS4_POLL_RETRY_MAX); 798 return 0; 799 } 800 801 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 802 { 803 if (!nfs41_sequence_process(task, res)) 804 return 0; 805 if (res->sr_slot != NULL) 806 nfs41_sequence_free_slot(res); 807 return 1; 808 809 } 810 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 811 812 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 813 { 814 if (res->sr_slot == NULL) 815 return 1; 816 if (res->sr_slot->table->session != NULL) 817 return nfs41_sequence_process(task, res); 818 return nfs40_sequence_done(task, res); 819 } 820 821 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 822 { 823 if (res->sr_slot != NULL) { 824 if (res->sr_slot->table->session != NULL) 825 nfs41_sequence_free_slot(res); 826 else 827 nfs40_sequence_free_slot(res); 828 } 829 } 830 831 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 832 { 833 if (res->sr_slot == NULL) 834 return 1; 835 if (!res->sr_slot->table->session) 836 return nfs40_sequence_done(task, res); 837 return nfs41_sequence_done(task, res); 838 } 839 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 840 841 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 842 { 843 struct nfs4_call_sync_data *data = calldata; 844 845 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 846 847 nfs4_setup_sequence(data->seq_server->nfs_client, 848 data->seq_args, data->seq_res, task); 849 } 850 851 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 852 { 853 struct nfs4_call_sync_data *data = calldata; 854 855 nfs41_sequence_done(task, data->seq_res); 856 } 857 858 static const struct rpc_call_ops nfs41_call_sync_ops = { 859 .rpc_call_prepare = nfs41_call_sync_prepare, 860 .rpc_call_done = nfs41_call_sync_done, 861 }; 862 863 static void 864 nfs4_sequence_process_interrupted(struct nfs_client *client, 865 struct nfs4_slot *slot, struct rpc_cred *cred) 866 { 867 struct rpc_task *task; 868 869 task = _nfs41_proc_sequence(client, cred, slot, true); 870 if (!IS_ERR(task)) 871 rpc_put_task_async(task); 872 } 873 874 #else /* !CONFIG_NFS_V4_1 */ 875 876 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 877 { 878 return nfs40_sequence_done(task, res); 879 } 880 881 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 882 { 883 if (res->sr_slot != NULL) 884 nfs40_sequence_free_slot(res); 885 } 886 887 int nfs4_sequence_done(struct rpc_task *task, 888 struct nfs4_sequence_res *res) 889 { 890 return nfs40_sequence_done(task, res); 891 } 892 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 893 894 static void 895 nfs4_sequence_process_interrupted(struct nfs_client *client, 896 struct nfs4_slot *slot, struct rpc_cred *cred) 897 { 898 WARN_ON_ONCE(1); 899 slot->interrupted = 0; 900 } 901 902 #endif /* !CONFIG_NFS_V4_1 */ 903 904 static 905 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 906 struct nfs4_sequence_res *res, 907 struct nfs4_slot *slot) 908 { 909 if (!slot) 910 return; 911 slot->privileged = args->sa_privileged ? 1 : 0; 912 args->sa_slot = slot; 913 914 res->sr_slot = slot; 915 res->sr_timestamp = jiffies; 916 res->sr_status_flags = 0; 917 res->sr_status = 1; 918 919 } 920 921 int nfs4_setup_sequence(struct nfs_client *client, 922 struct nfs4_sequence_args *args, 923 struct nfs4_sequence_res *res, 924 struct rpc_task *task) 925 { 926 struct nfs4_session *session = nfs4_get_session(client); 927 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 928 struct nfs4_slot *slot; 929 930 /* slot already allocated? */ 931 if (res->sr_slot != NULL) 932 goto out_start; 933 934 if (session) { 935 tbl = &session->fc_slot_table; 936 task->tk_timeout = 0; 937 } 938 939 for (;;) { 940 spin_lock(&tbl->slot_tbl_lock); 941 /* The state manager will wait until the slot table is empty */ 942 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 943 goto out_sleep; 944 945 slot = nfs4_alloc_slot(tbl); 946 if (IS_ERR(slot)) { 947 /* Try again in 1/4 second */ 948 if (slot == ERR_PTR(-ENOMEM)) 949 task->tk_timeout = HZ >> 2; 950 goto out_sleep; 951 } 952 spin_unlock(&tbl->slot_tbl_lock); 953 954 if (likely(!slot->interrupted)) 955 break; 956 nfs4_sequence_process_interrupted(client, 957 slot, task->tk_msg.rpc_cred); 958 } 959 960 nfs4_sequence_attach_slot(args, res, slot); 961 962 trace_nfs4_setup_sequence(session, args); 963 out_start: 964 rpc_call_start(task); 965 return 0; 966 967 out_sleep: 968 if (args->sa_privileged) 969 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 970 NULL, RPC_PRIORITY_PRIVILEGED); 971 else 972 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 973 spin_unlock(&tbl->slot_tbl_lock); 974 return -EAGAIN; 975 } 976 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 977 978 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 979 { 980 struct nfs4_call_sync_data *data = calldata; 981 nfs4_setup_sequence(data->seq_server->nfs_client, 982 data->seq_args, data->seq_res, task); 983 } 984 985 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 986 { 987 struct nfs4_call_sync_data *data = calldata; 988 nfs4_sequence_done(task, data->seq_res); 989 } 990 991 static const struct rpc_call_ops nfs40_call_sync_ops = { 992 .rpc_call_prepare = nfs40_call_sync_prepare, 993 .rpc_call_done = nfs40_call_sync_done, 994 }; 995 996 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 997 struct nfs_server *server, 998 struct rpc_message *msg, 999 struct nfs4_sequence_args *args, 1000 struct nfs4_sequence_res *res) 1001 { 1002 int ret; 1003 struct rpc_task *task; 1004 struct nfs_client *clp = server->nfs_client; 1005 struct nfs4_call_sync_data data = { 1006 .seq_server = server, 1007 .seq_args = args, 1008 .seq_res = res, 1009 }; 1010 struct rpc_task_setup task_setup = { 1011 .rpc_client = clnt, 1012 .rpc_message = msg, 1013 .callback_ops = clp->cl_mvops->call_sync_ops, 1014 .callback_data = &data 1015 }; 1016 1017 task = rpc_run_task(&task_setup); 1018 if (IS_ERR(task)) 1019 ret = PTR_ERR(task); 1020 else { 1021 ret = task->tk_status; 1022 rpc_put_task(task); 1023 } 1024 return ret; 1025 } 1026 1027 int nfs4_call_sync(struct rpc_clnt *clnt, 1028 struct nfs_server *server, 1029 struct rpc_message *msg, 1030 struct nfs4_sequence_args *args, 1031 struct nfs4_sequence_res *res, 1032 int cache_reply) 1033 { 1034 nfs4_init_sequence(args, res, cache_reply, 0); 1035 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1036 } 1037 1038 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1039 unsigned long timestamp) 1040 { 1041 struct nfs_inode *nfsi = NFS_I(dir); 1042 1043 spin_lock(&dir->i_lock); 1044 nfsi->cache_validity |= NFS_INO_INVALID_CTIME 1045 | NFS_INO_INVALID_MTIME 1046 | NFS_INO_INVALID_DATA; 1047 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) { 1048 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; 1049 nfsi->attrtimeo_timestamp = jiffies; 1050 } else { 1051 nfs_force_lookup_revalidate(dir); 1052 if (cinfo->before != inode_peek_iversion_raw(dir)) 1053 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | 1054 NFS_INO_INVALID_ACL; 1055 } 1056 inode_set_iversion_raw(dir, cinfo->after); 1057 nfsi->read_cache_jiffies = timestamp; 1058 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1059 nfs_fscache_invalidate(dir); 1060 spin_unlock(&dir->i_lock); 1061 } 1062 1063 struct nfs4_opendata { 1064 struct kref kref; 1065 struct nfs_openargs o_arg; 1066 struct nfs_openres o_res; 1067 struct nfs_open_confirmargs c_arg; 1068 struct nfs_open_confirmres c_res; 1069 struct nfs4_string owner_name; 1070 struct nfs4_string group_name; 1071 struct nfs4_label *a_label; 1072 struct nfs_fattr f_attr; 1073 struct nfs4_label *f_label; 1074 struct dentry *dir; 1075 struct dentry *dentry; 1076 struct nfs4_state_owner *owner; 1077 struct nfs4_state *state; 1078 struct iattr attrs; 1079 unsigned long timestamp; 1080 bool rpc_done; 1081 bool file_created; 1082 bool is_recover; 1083 bool cancelled; 1084 int rpc_status; 1085 }; 1086 1087 struct nfs4_open_createattrs { 1088 struct nfs4_label *label; 1089 struct iattr *sattr; 1090 const __u32 verf[2]; 1091 }; 1092 1093 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1094 int err, struct nfs4_exception *exception) 1095 { 1096 if (err != -EINVAL) 1097 return false; 1098 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1099 return false; 1100 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1101 exception->retry = 1; 1102 return true; 1103 } 1104 1105 static u32 1106 nfs4_map_atomic_open_share(struct nfs_server *server, 1107 fmode_t fmode, int openflags) 1108 { 1109 u32 res = 0; 1110 1111 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1112 case FMODE_READ: 1113 res = NFS4_SHARE_ACCESS_READ; 1114 break; 1115 case FMODE_WRITE: 1116 res = NFS4_SHARE_ACCESS_WRITE; 1117 break; 1118 case FMODE_READ|FMODE_WRITE: 1119 res = NFS4_SHARE_ACCESS_BOTH; 1120 } 1121 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1122 goto out; 1123 /* Want no delegation if we're using O_DIRECT */ 1124 if (openflags & O_DIRECT) 1125 res |= NFS4_SHARE_WANT_NO_DELEG; 1126 out: 1127 return res; 1128 } 1129 1130 static enum open_claim_type4 1131 nfs4_map_atomic_open_claim(struct nfs_server *server, 1132 enum open_claim_type4 claim) 1133 { 1134 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1135 return claim; 1136 switch (claim) { 1137 default: 1138 return claim; 1139 case NFS4_OPEN_CLAIM_FH: 1140 return NFS4_OPEN_CLAIM_NULL; 1141 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1142 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1143 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1144 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1145 } 1146 } 1147 1148 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1149 { 1150 p->o_res.f_attr = &p->f_attr; 1151 p->o_res.f_label = p->f_label; 1152 p->o_res.seqid = p->o_arg.seqid; 1153 p->c_res.seqid = p->c_arg.seqid; 1154 p->o_res.server = p->o_arg.server; 1155 p->o_res.access_request = p->o_arg.access; 1156 nfs_fattr_init(&p->f_attr); 1157 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1158 } 1159 1160 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1161 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1162 const struct nfs4_open_createattrs *c, 1163 enum open_claim_type4 claim, 1164 gfp_t gfp_mask) 1165 { 1166 struct dentry *parent = dget_parent(dentry); 1167 struct inode *dir = d_inode(parent); 1168 struct nfs_server *server = NFS_SERVER(dir); 1169 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1170 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1171 struct nfs4_opendata *p; 1172 1173 p = kzalloc(sizeof(*p), gfp_mask); 1174 if (p == NULL) 1175 goto err; 1176 1177 p->f_label = nfs4_label_alloc(server, gfp_mask); 1178 if (IS_ERR(p->f_label)) 1179 goto err_free_p; 1180 1181 p->a_label = nfs4_label_alloc(server, gfp_mask); 1182 if (IS_ERR(p->a_label)) 1183 goto err_free_f; 1184 1185 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1186 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1187 if (IS_ERR(p->o_arg.seqid)) 1188 goto err_free_label; 1189 nfs_sb_active(dentry->d_sb); 1190 p->dentry = dget(dentry); 1191 p->dir = parent; 1192 p->owner = sp; 1193 atomic_inc(&sp->so_count); 1194 p->o_arg.open_flags = flags; 1195 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1196 p->o_arg.umask = current_umask(); 1197 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1198 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1199 fmode, flags); 1200 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1201 * will return permission denied for all bits until close */ 1202 if (!(flags & O_EXCL)) { 1203 /* ask server to check for all possible rights as results 1204 * are cached */ 1205 switch (p->o_arg.claim) { 1206 default: 1207 break; 1208 case NFS4_OPEN_CLAIM_NULL: 1209 case NFS4_OPEN_CLAIM_FH: 1210 p->o_arg.access = NFS4_ACCESS_READ | 1211 NFS4_ACCESS_MODIFY | 1212 NFS4_ACCESS_EXTEND | 1213 NFS4_ACCESS_EXECUTE; 1214 } 1215 } 1216 p->o_arg.clientid = server->nfs_client->cl_clientid; 1217 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1218 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1219 p->o_arg.name = &dentry->d_name; 1220 p->o_arg.server = server; 1221 p->o_arg.bitmask = nfs4_bitmask(server, label); 1222 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1223 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1224 switch (p->o_arg.claim) { 1225 case NFS4_OPEN_CLAIM_NULL: 1226 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1227 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1228 p->o_arg.fh = NFS_FH(dir); 1229 break; 1230 case NFS4_OPEN_CLAIM_PREVIOUS: 1231 case NFS4_OPEN_CLAIM_FH: 1232 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1233 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1234 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1235 } 1236 if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) { 1237 p->o_arg.u.attrs = &p->attrs; 1238 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1239 1240 memcpy(p->o_arg.u.verifier.data, c->verf, 1241 sizeof(p->o_arg.u.verifier.data)); 1242 } 1243 p->c_arg.fh = &p->o_res.fh; 1244 p->c_arg.stateid = &p->o_res.stateid; 1245 p->c_arg.seqid = p->o_arg.seqid; 1246 nfs4_init_opendata_res(p); 1247 kref_init(&p->kref); 1248 return p; 1249 1250 err_free_label: 1251 nfs4_label_free(p->a_label); 1252 err_free_f: 1253 nfs4_label_free(p->f_label); 1254 err_free_p: 1255 kfree(p); 1256 err: 1257 dput(parent); 1258 return NULL; 1259 } 1260 1261 static void nfs4_opendata_free(struct kref *kref) 1262 { 1263 struct nfs4_opendata *p = container_of(kref, 1264 struct nfs4_opendata, kref); 1265 struct super_block *sb = p->dentry->d_sb; 1266 1267 nfs_free_seqid(p->o_arg.seqid); 1268 nfs4_sequence_free_slot(&p->o_res.seq_res); 1269 if (p->state != NULL) 1270 nfs4_put_open_state(p->state); 1271 nfs4_put_state_owner(p->owner); 1272 1273 nfs4_label_free(p->a_label); 1274 nfs4_label_free(p->f_label); 1275 1276 dput(p->dir); 1277 dput(p->dentry); 1278 nfs_sb_deactive(sb); 1279 nfs_fattr_free_names(&p->f_attr); 1280 kfree(p->f_attr.mdsthreshold); 1281 kfree(p); 1282 } 1283 1284 static void nfs4_opendata_put(struct nfs4_opendata *p) 1285 { 1286 if (p != NULL) 1287 kref_put(&p->kref, nfs4_opendata_free); 1288 } 1289 1290 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1291 fmode_t fmode) 1292 { 1293 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1294 case FMODE_READ|FMODE_WRITE: 1295 return state->n_rdwr != 0; 1296 case FMODE_WRITE: 1297 return state->n_wronly != 0; 1298 case FMODE_READ: 1299 return state->n_rdonly != 0; 1300 } 1301 WARN_ON_ONCE(1); 1302 return false; 1303 } 1304 1305 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1306 { 1307 int ret = 0; 1308 1309 if (open_mode & (O_EXCL|O_TRUNC)) 1310 goto out; 1311 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1312 case FMODE_READ: 1313 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1314 && state->n_rdonly != 0; 1315 break; 1316 case FMODE_WRITE: 1317 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1318 && state->n_wronly != 0; 1319 break; 1320 case FMODE_READ|FMODE_WRITE: 1321 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1322 && state->n_rdwr != 0; 1323 } 1324 out: 1325 return ret; 1326 } 1327 1328 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1329 enum open_claim_type4 claim) 1330 { 1331 if (delegation == NULL) 1332 return 0; 1333 if ((delegation->type & fmode) != fmode) 1334 return 0; 1335 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1336 return 0; 1337 switch (claim) { 1338 case NFS4_OPEN_CLAIM_NULL: 1339 case NFS4_OPEN_CLAIM_FH: 1340 break; 1341 case NFS4_OPEN_CLAIM_PREVIOUS: 1342 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1343 break; 1344 default: 1345 return 0; 1346 } 1347 nfs_mark_delegation_referenced(delegation); 1348 return 1; 1349 } 1350 1351 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1352 { 1353 switch (fmode) { 1354 case FMODE_WRITE: 1355 state->n_wronly++; 1356 break; 1357 case FMODE_READ: 1358 state->n_rdonly++; 1359 break; 1360 case FMODE_READ|FMODE_WRITE: 1361 state->n_rdwr++; 1362 } 1363 nfs4_state_set_mode_locked(state, state->state | fmode); 1364 } 1365 1366 #ifdef CONFIG_NFS_V4_1 1367 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1368 { 1369 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1370 return true; 1371 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1372 return true; 1373 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1374 return true; 1375 return false; 1376 } 1377 #endif /* CONFIG_NFS_V4_1 */ 1378 1379 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1380 { 1381 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1382 wake_up_all(&state->waitq); 1383 } 1384 1385 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state, 1386 const nfs4_stateid *stateid) 1387 { 1388 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid); 1389 u32 stateid_seqid = be32_to_cpu(stateid->seqid); 1390 1391 if (stateid_seqid == state_seqid + 1U || 1392 (stateid_seqid == 1U && state_seqid == 0xffffffffU)) 1393 nfs_state_log_update_open_stateid(state); 1394 else 1395 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1396 } 1397 1398 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1399 { 1400 struct nfs_client *clp = state->owner->so_server->nfs_client; 1401 bool need_recover = false; 1402 1403 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1404 need_recover = true; 1405 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1406 need_recover = true; 1407 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1408 need_recover = true; 1409 if (need_recover) 1410 nfs4_state_mark_reclaim_nograce(clp, state); 1411 } 1412 1413 /* 1414 * Check for whether or not the caller may update the open stateid 1415 * to the value passed in by stateid. 1416 * 1417 * Note: This function relies heavily on the server implementing 1418 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1419 * correctly. 1420 * i.e. The stateid seqids have to be initialised to 1, and 1421 * are then incremented on every state transition. 1422 */ 1423 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1424 const nfs4_stateid *stateid) 1425 { 1426 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 || 1427 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1428 if (stateid->seqid == cpu_to_be32(1)) 1429 nfs_state_log_update_open_stateid(state); 1430 else 1431 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1432 return true; 1433 } 1434 1435 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1436 nfs_state_log_out_of_order_open_stateid(state, stateid); 1437 return true; 1438 } 1439 return false; 1440 } 1441 1442 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1443 { 1444 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1445 return; 1446 if (state->n_wronly) 1447 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1448 if (state->n_rdonly) 1449 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1450 if (state->n_rdwr) 1451 set_bit(NFS_O_RDWR_STATE, &state->flags); 1452 set_bit(NFS_OPEN_STATE, &state->flags); 1453 } 1454 1455 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1456 nfs4_stateid *stateid, fmode_t fmode) 1457 { 1458 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1459 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1460 case FMODE_WRITE: 1461 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1462 break; 1463 case FMODE_READ: 1464 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1465 break; 1466 case 0: 1467 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1468 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1469 clear_bit(NFS_OPEN_STATE, &state->flags); 1470 } 1471 if (stateid == NULL) 1472 return; 1473 /* Handle OPEN+OPEN_DOWNGRADE races */ 1474 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1475 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1476 nfs_resync_open_stateid_locked(state); 1477 goto out; 1478 } 1479 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1480 nfs4_stateid_copy(&state->stateid, stateid); 1481 nfs4_stateid_copy(&state->open_stateid, stateid); 1482 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1483 out: 1484 nfs_state_log_update_open_stateid(state); 1485 } 1486 1487 static void nfs_clear_open_stateid(struct nfs4_state *state, 1488 nfs4_stateid *arg_stateid, 1489 nfs4_stateid *stateid, fmode_t fmode) 1490 { 1491 write_seqlock(&state->seqlock); 1492 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1493 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1494 nfs_clear_open_stateid_locked(state, stateid, fmode); 1495 write_sequnlock(&state->seqlock); 1496 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1497 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1498 } 1499 1500 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1501 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1502 { 1503 DEFINE_WAIT(wait); 1504 int status = 0; 1505 for (;;) { 1506 1507 if (!nfs_need_update_open_stateid(state, stateid)) 1508 return; 1509 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1510 break; 1511 if (status) 1512 break; 1513 /* Rely on seqids for serialisation with NFSv4.0 */ 1514 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1515 break; 1516 1517 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1518 /* 1519 * Ensure we process the state changes in the same order 1520 * in which the server processed them by delaying the 1521 * update of the stateid until we are in sequence. 1522 */ 1523 write_sequnlock(&state->seqlock); 1524 spin_unlock(&state->owner->so_lock); 1525 rcu_read_unlock(); 1526 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1527 if (!signal_pending(current)) { 1528 if (schedule_timeout(5*HZ) == 0) 1529 status = -EAGAIN; 1530 else 1531 status = 0; 1532 } else 1533 status = -EINTR; 1534 finish_wait(&state->waitq, &wait); 1535 rcu_read_lock(); 1536 spin_lock(&state->owner->so_lock); 1537 write_seqlock(&state->seqlock); 1538 } 1539 1540 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1541 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1542 nfs4_stateid_copy(freeme, &state->open_stateid); 1543 nfs_test_and_clear_all_open_stateid(state); 1544 } 1545 1546 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1547 nfs4_stateid_copy(&state->stateid, stateid); 1548 nfs4_stateid_copy(&state->open_stateid, stateid); 1549 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1550 nfs_state_log_update_open_stateid(state); 1551 } 1552 1553 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1554 const nfs4_stateid *open_stateid, 1555 fmode_t fmode, 1556 nfs4_stateid *freeme) 1557 { 1558 /* 1559 * Protect the call to nfs4_state_set_mode_locked and 1560 * serialise the stateid update 1561 */ 1562 write_seqlock(&state->seqlock); 1563 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1564 switch (fmode) { 1565 case FMODE_READ: 1566 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1567 break; 1568 case FMODE_WRITE: 1569 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1570 break; 1571 case FMODE_READ|FMODE_WRITE: 1572 set_bit(NFS_O_RDWR_STATE, &state->flags); 1573 } 1574 set_bit(NFS_OPEN_STATE, &state->flags); 1575 write_sequnlock(&state->seqlock); 1576 } 1577 1578 static void nfs_state_set_delegation(struct nfs4_state *state, 1579 const nfs4_stateid *deleg_stateid, 1580 fmode_t fmode) 1581 { 1582 /* 1583 * Protect the call to nfs4_state_set_mode_locked and 1584 * serialise the stateid update 1585 */ 1586 write_seqlock(&state->seqlock); 1587 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1588 set_bit(NFS_DELEGATED_STATE, &state->flags); 1589 write_sequnlock(&state->seqlock); 1590 } 1591 1592 static int update_open_stateid(struct nfs4_state *state, 1593 const nfs4_stateid *open_stateid, 1594 const nfs4_stateid *delegation, 1595 fmode_t fmode) 1596 { 1597 struct nfs_server *server = NFS_SERVER(state->inode); 1598 struct nfs_client *clp = server->nfs_client; 1599 struct nfs_inode *nfsi = NFS_I(state->inode); 1600 struct nfs_delegation *deleg_cur; 1601 nfs4_stateid freeme = { }; 1602 int ret = 0; 1603 1604 fmode &= (FMODE_READ|FMODE_WRITE); 1605 1606 rcu_read_lock(); 1607 spin_lock(&state->owner->so_lock); 1608 if (open_stateid != NULL) { 1609 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1610 ret = 1; 1611 } 1612 1613 deleg_cur = rcu_dereference(nfsi->delegation); 1614 if (deleg_cur == NULL) 1615 goto no_delegation; 1616 1617 spin_lock(&deleg_cur->lock); 1618 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1619 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1620 (deleg_cur->type & fmode) != fmode) 1621 goto no_delegation_unlock; 1622 1623 if (delegation == NULL) 1624 delegation = &deleg_cur->stateid; 1625 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1626 goto no_delegation_unlock; 1627 1628 nfs_mark_delegation_referenced(deleg_cur); 1629 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1630 ret = 1; 1631 no_delegation_unlock: 1632 spin_unlock(&deleg_cur->lock); 1633 no_delegation: 1634 if (ret) 1635 update_open_stateflags(state, fmode); 1636 spin_unlock(&state->owner->so_lock); 1637 rcu_read_unlock(); 1638 1639 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1640 nfs4_schedule_state_manager(clp); 1641 if (freeme.type != 0) 1642 nfs4_test_and_free_stateid(server, &freeme, 1643 state->owner->so_cred); 1644 1645 return ret; 1646 } 1647 1648 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1649 const nfs4_stateid *stateid) 1650 { 1651 struct nfs4_state *state = lsp->ls_state; 1652 bool ret = false; 1653 1654 spin_lock(&state->state_lock); 1655 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1656 goto out_noupdate; 1657 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1658 goto out_noupdate; 1659 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1660 ret = true; 1661 out_noupdate: 1662 spin_unlock(&state->state_lock); 1663 return ret; 1664 } 1665 1666 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1667 { 1668 struct nfs_delegation *delegation; 1669 1670 fmode &= FMODE_READ|FMODE_WRITE; 1671 rcu_read_lock(); 1672 delegation = rcu_dereference(NFS_I(inode)->delegation); 1673 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1674 rcu_read_unlock(); 1675 return; 1676 } 1677 rcu_read_unlock(); 1678 nfs4_inode_return_delegation(inode); 1679 } 1680 1681 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1682 { 1683 struct nfs4_state *state = opendata->state; 1684 struct nfs_inode *nfsi = NFS_I(state->inode); 1685 struct nfs_delegation *delegation; 1686 int open_mode = opendata->o_arg.open_flags; 1687 fmode_t fmode = opendata->o_arg.fmode; 1688 enum open_claim_type4 claim = opendata->o_arg.claim; 1689 nfs4_stateid stateid; 1690 int ret = -EAGAIN; 1691 1692 for (;;) { 1693 spin_lock(&state->owner->so_lock); 1694 if (can_open_cached(state, fmode, open_mode)) { 1695 update_open_stateflags(state, fmode); 1696 spin_unlock(&state->owner->so_lock); 1697 goto out_return_state; 1698 } 1699 spin_unlock(&state->owner->so_lock); 1700 rcu_read_lock(); 1701 delegation = rcu_dereference(nfsi->delegation); 1702 if (!can_open_delegated(delegation, fmode, claim)) { 1703 rcu_read_unlock(); 1704 break; 1705 } 1706 /* Save the delegation */ 1707 nfs4_stateid_copy(&stateid, &delegation->stateid); 1708 rcu_read_unlock(); 1709 nfs_release_seqid(opendata->o_arg.seqid); 1710 if (!opendata->is_recover) { 1711 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1712 if (ret != 0) 1713 goto out; 1714 } 1715 ret = -EAGAIN; 1716 1717 /* Try to update the stateid using the delegation */ 1718 if (update_open_stateid(state, NULL, &stateid, fmode)) 1719 goto out_return_state; 1720 } 1721 out: 1722 return ERR_PTR(ret); 1723 out_return_state: 1724 atomic_inc(&state->count); 1725 return state; 1726 } 1727 1728 static void 1729 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1730 { 1731 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1732 struct nfs_delegation *delegation; 1733 int delegation_flags = 0; 1734 1735 rcu_read_lock(); 1736 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1737 if (delegation) 1738 delegation_flags = delegation->flags; 1739 rcu_read_unlock(); 1740 switch (data->o_arg.claim) { 1741 default: 1742 break; 1743 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1744 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1745 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1746 "returning a delegation for " 1747 "OPEN(CLAIM_DELEGATE_CUR)\n", 1748 clp->cl_hostname); 1749 return; 1750 } 1751 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1752 nfs_inode_set_delegation(state->inode, 1753 data->owner->so_cred, 1754 data->o_res.delegation_type, 1755 &data->o_res.delegation, 1756 data->o_res.pagemod_limit); 1757 else 1758 nfs_inode_reclaim_delegation(state->inode, 1759 data->owner->so_cred, 1760 data->o_res.delegation_type, 1761 &data->o_res.delegation, 1762 data->o_res.pagemod_limit); 1763 } 1764 1765 /* 1766 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1767 * and update the nfs4_state. 1768 */ 1769 static struct nfs4_state * 1770 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1771 { 1772 struct inode *inode = data->state->inode; 1773 struct nfs4_state *state = data->state; 1774 int ret; 1775 1776 if (!data->rpc_done) { 1777 if (data->rpc_status) 1778 return ERR_PTR(data->rpc_status); 1779 /* cached opens have already been processed */ 1780 goto update; 1781 } 1782 1783 ret = nfs_refresh_inode(inode, &data->f_attr); 1784 if (ret) 1785 return ERR_PTR(ret); 1786 1787 if (data->o_res.delegation_type != 0) 1788 nfs4_opendata_check_deleg(data, state); 1789 update: 1790 update_open_stateid(state, &data->o_res.stateid, NULL, 1791 data->o_arg.fmode); 1792 atomic_inc(&state->count); 1793 1794 return state; 1795 } 1796 1797 static struct inode * 1798 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1799 { 1800 struct inode *inode; 1801 1802 switch (data->o_arg.claim) { 1803 case NFS4_OPEN_CLAIM_NULL: 1804 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1805 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1806 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1807 return ERR_PTR(-EAGAIN); 1808 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 1809 &data->f_attr, data->f_label); 1810 break; 1811 default: 1812 inode = d_inode(data->dentry); 1813 ihold(inode); 1814 nfs_refresh_inode(inode, &data->f_attr); 1815 } 1816 return inode; 1817 } 1818 1819 static struct nfs4_state * 1820 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 1821 { 1822 struct nfs4_state *state; 1823 struct inode *inode; 1824 1825 inode = nfs4_opendata_get_inode(data); 1826 if (IS_ERR(inode)) 1827 return ERR_CAST(inode); 1828 if (data->state != NULL && data->state->inode == inode) { 1829 state = data->state; 1830 atomic_inc(&state->count); 1831 } else 1832 state = nfs4_get_open_state(inode, data->owner); 1833 iput(inode); 1834 if (state == NULL) 1835 state = ERR_PTR(-ENOMEM); 1836 return state; 1837 } 1838 1839 static struct nfs4_state * 1840 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1841 { 1842 struct nfs4_state *state; 1843 1844 if (!data->rpc_done) { 1845 state = nfs4_try_open_cached(data); 1846 trace_nfs4_cached_open(data->state); 1847 goto out; 1848 } 1849 1850 state = nfs4_opendata_find_nfs4_state(data); 1851 if (IS_ERR(state)) 1852 goto out; 1853 1854 if (data->o_res.delegation_type != 0) 1855 nfs4_opendata_check_deleg(data, state); 1856 update_open_stateid(state, &data->o_res.stateid, NULL, 1857 data->o_arg.fmode); 1858 out: 1859 nfs_release_seqid(data->o_arg.seqid); 1860 return state; 1861 } 1862 1863 static struct nfs4_state * 1864 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1865 { 1866 struct nfs4_state *ret; 1867 1868 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1869 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 1870 else 1871 ret = _nfs4_opendata_to_nfs4_state(data); 1872 nfs4_sequence_free_slot(&data->o_res.seq_res); 1873 return ret; 1874 } 1875 1876 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1877 { 1878 struct nfs_inode *nfsi = NFS_I(state->inode); 1879 struct nfs_open_context *ctx; 1880 1881 spin_lock(&state->inode->i_lock); 1882 list_for_each_entry(ctx, &nfsi->open_files, list) { 1883 if (ctx->state != state) 1884 continue; 1885 get_nfs_open_context(ctx); 1886 spin_unlock(&state->inode->i_lock); 1887 return ctx; 1888 } 1889 spin_unlock(&state->inode->i_lock); 1890 return ERR_PTR(-ENOENT); 1891 } 1892 1893 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1894 struct nfs4_state *state, enum open_claim_type4 claim) 1895 { 1896 struct nfs4_opendata *opendata; 1897 1898 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1899 NULL, claim, GFP_NOFS); 1900 if (opendata == NULL) 1901 return ERR_PTR(-ENOMEM); 1902 opendata->state = state; 1903 atomic_inc(&state->count); 1904 return opendata; 1905 } 1906 1907 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 1908 fmode_t fmode) 1909 { 1910 struct nfs4_state *newstate; 1911 int ret; 1912 1913 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 1914 return 0; 1915 opendata->o_arg.open_flags = 0; 1916 opendata->o_arg.fmode = fmode; 1917 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 1918 NFS_SB(opendata->dentry->d_sb), 1919 fmode, 0); 1920 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1921 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1922 nfs4_init_opendata_res(opendata); 1923 ret = _nfs4_recover_proc_open(opendata); 1924 if (ret != 0) 1925 return ret; 1926 newstate = nfs4_opendata_to_nfs4_state(opendata); 1927 if (IS_ERR(newstate)) 1928 return PTR_ERR(newstate); 1929 if (newstate != opendata->state) 1930 ret = -ESTALE; 1931 nfs4_close_state(newstate, fmode); 1932 return ret; 1933 } 1934 1935 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1936 { 1937 int ret; 1938 1939 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1940 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1941 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1942 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1943 /* memory barrier prior to reading state->n_* */ 1944 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1945 clear_bit(NFS_OPEN_STATE, &state->flags); 1946 smp_rmb(); 1947 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1948 if (ret != 0) 1949 return ret; 1950 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1951 if (ret != 0) 1952 return ret; 1953 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 1954 if (ret != 0) 1955 return ret; 1956 /* 1957 * We may have performed cached opens for all three recoveries. 1958 * Check if we need to update the current stateid. 1959 */ 1960 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1961 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1962 write_seqlock(&state->seqlock); 1963 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1964 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1965 write_sequnlock(&state->seqlock); 1966 } 1967 return 0; 1968 } 1969 1970 /* 1971 * OPEN_RECLAIM: 1972 * reclaim state on the server after a reboot. 1973 */ 1974 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1975 { 1976 struct nfs_delegation *delegation; 1977 struct nfs4_opendata *opendata; 1978 fmode_t delegation_type = 0; 1979 int status; 1980 1981 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1982 NFS4_OPEN_CLAIM_PREVIOUS); 1983 if (IS_ERR(opendata)) 1984 return PTR_ERR(opendata); 1985 rcu_read_lock(); 1986 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1987 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1988 delegation_type = delegation->type; 1989 rcu_read_unlock(); 1990 opendata->o_arg.u.delegation_type = delegation_type; 1991 status = nfs4_open_recover(opendata, state); 1992 nfs4_opendata_put(opendata); 1993 return status; 1994 } 1995 1996 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1997 { 1998 struct nfs_server *server = NFS_SERVER(state->inode); 1999 struct nfs4_exception exception = { }; 2000 int err; 2001 do { 2002 err = _nfs4_do_open_reclaim(ctx, state); 2003 trace_nfs4_open_reclaim(ctx, 0, err); 2004 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2005 continue; 2006 if (err != -NFS4ERR_DELAY) 2007 break; 2008 nfs4_handle_exception(server, err, &exception); 2009 } while (exception.retry); 2010 return err; 2011 } 2012 2013 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2014 { 2015 struct nfs_open_context *ctx; 2016 int ret; 2017 2018 ctx = nfs4_state_find_open_context(state); 2019 if (IS_ERR(ctx)) 2020 return -EAGAIN; 2021 ret = nfs4_do_open_reclaim(ctx, state); 2022 put_nfs_open_context(ctx); 2023 return ret; 2024 } 2025 2026 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) 2027 { 2028 switch (err) { 2029 default: 2030 printk(KERN_ERR "NFS: %s: unhandled error " 2031 "%d.\n", __func__, err); 2032 case 0: 2033 case -ENOENT: 2034 case -EAGAIN: 2035 case -ESTALE: 2036 break; 2037 case -NFS4ERR_BADSESSION: 2038 case -NFS4ERR_BADSLOT: 2039 case -NFS4ERR_BAD_HIGH_SLOT: 2040 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2041 case -NFS4ERR_DEADSESSION: 2042 set_bit(NFS_DELEGATED_STATE, &state->flags); 2043 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 2044 return -EAGAIN; 2045 case -NFS4ERR_STALE_CLIENTID: 2046 case -NFS4ERR_STALE_STATEID: 2047 set_bit(NFS_DELEGATED_STATE, &state->flags); 2048 /* Don't recall a delegation if it was lost */ 2049 nfs4_schedule_lease_recovery(server->nfs_client); 2050 return -EAGAIN; 2051 case -NFS4ERR_MOVED: 2052 nfs4_schedule_migration_recovery(server); 2053 return -EAGAIN; 2054 case -NFS4ERR_LEASE_MOVED: 2055 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2056 return -EAGAIN; 2057 case -NFS4ERR_DELEG_REVOKED: 2058 case -NFS4ERR_ADMIN_REVOKED: 2059 case -NFS4ERR_EXPIRED: 2060 case -NFS4ERR_BAD_STATEID: 2061 case -NFS4ERR_OPENMODE: 2062 nfs_inode_find_state_and_recover(state->inode, 2063 stateid); 2064 nfs4_schedule_stateid_recovery(server, state); 2065 return -EAGAIN; 2066 case -NFS4ERR_DELAY: 2067 case -NFS4ERR_GRACE: 2068 set_bit(NFS_DELEGATED_STATE, &state->flags); 2069 ssleep(1); 2070 return -EAGAIN; 2071 case -ENOMEM: 2072 case -NFS4ERR_DENIED: 2073 if (fl) { 2074 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2075 if (lsp) 2076 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2077 } 2078 return 0; 2079 } 2080 return err; 2081 } 2082 2083 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2084 struct nfs4_state *state, const nfs4_stateid *stateid, 2085 fmode_t type) 2086 { 2087 struct nfs_server *server = NFS_SERVER(state->inode); 2088 struct nfs4_opendata *opendata; 2089 int err = 0; 2090 2091 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2092 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2093 if (IS_ERR(opendata)) 2094 return PTR_ERR(opendata); 2095 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2096 write_seqlock(&state->seqlock); 2097 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2098 write_sequnlock(&state->seqlock); 2099 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2100 switch (type & (FMODE_READ|FMODE_WRITE)) { 2101 case FMODE_READ|FMODE_WRITE: 2102 case FMODE_WRITE: 2103 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2104 if (err) 2105 break; 2106 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2107 if (err) 2108 break; 2109 case FMODE_READ: 2110 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2111 } 2112 nfs4_opendata_put(opendata); 2113 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2114 } 2115 2116 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2117 { 2118 struct nfs4_opendata *data = calldata; 2119 2120 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2121 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2122 } 2123 2124 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2125 { 2126 struct nfs4_opendata *data = calldata; 2127 2128 nfs40_sequence_done(task, &data->c_res.seq_res); 2129 2130 data->rpc_status = task->tk_status; 2131 if (data->rpc_status == 0) { 2132 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2133 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2134 renew_lease(data->o_res.server, data->timestamp); 2135 data->rpc_done = true; 2136 } 2137 } 2138 2139 static void nfs4_open_confirm_release(void *calldata) 2140 { 2141 struct nfs4_opendata *data = calldata; 2142 struct nfs4_state *state = NULL; 2143 2144 /* If this request hasn't been cancelled, do nothing */ 2145 if (!data->cancelled) 2146 goto out_free; 2147 /* In case of error, no cleanup! */ 2148 if (!data->rpc_done) 2149 goto out_free; 2150 state = nfs4_opendata_to_nfs4_state(data); 2151 if (!IS_ERR(state)) 2152 nfs4_close_state(state, data->o_arg.fmode); 2153 out_free: 2154 nfs4_opendata_put(data); 2155 } 2156 2157 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2158 .rpc_call_prepare = nfs4_open_confirm_prepare, 2159 .rpc_call_done = nfs4_open_confirm_done, 2160 .rpc_release = nfs4_open_confirm_release, 2161 }; 2162 2163 /* 2164 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2165 */ 2166 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2167 { 2168 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2169 struct rpc_task *task; 2170 struct rpc_message msg = { 2171 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2172 .rpc_argp = &data->c_arg, 2173 .rpc_resp = &data->c_res, 2174 .rpc_cred = data->owner->so_cred, 2175 }; 2176 struct rpc_task_setup task_setup_data = { 2177 .rpc_client = server->client, 2178 .rpc_message = &msg, 2179 .callback_ops = &nfs4_open_confirm_ops, 2180 .callback_data = data, 2181 .workqueue = nfsiod_workqueue, 2182 .flags = RPC_TASK_ASYNC, 2183 }; 2184 int status; 2185 2186 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2187 data->is_recover); 2188 kref_get(&data->kref); 2189 data->rpc_done = false; 2190 data->rpc_status = 0; 2191 data->timestamp = jiffies; 2192 task = rpc_run_task(&task_setup_data); 2193 if (IS_ERR(task)) 2194 return PTR_ERR(task); 2195 status = rpc_wait_for_completion_task(task); 2196 if (status != 0) { 2197 data->cancelled = true; 2198 smp_wmb(); 2199 } else 2200 status = data->rpc_status; 2201 rpc_put_task(task); 2202 return status; 2203 } 2204 2205 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2206 { 2207 struct nfs4_opendata *data = calldata; 2208 struct nfs4_state_owner *sp = data->owner; 2209 struct nfs_client *clp = sp->so_server->nfs_client; 2210 enum open_claim_type4 claim = data->o_arg.claim; 2211 2212 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2213 goto out_wait; 2214 /* 2215 * Check if we still need to send an OPEN call, or if we can use 2216 * a delegation instead. 2217 */ 2218 if (data->state != NULL) { 2219 struct nfs_delegation *delegation; 2220 2221 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 2222 goto out_no_action; 2223 rcu_read_lock(); 2224 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 2225 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2226 goto unlock_no_action; 2227 rcu_read_unlock(); 2228 } 2229 /* Update client id. */ 2230 data->o_arg.clientid = clp->cl_clientid; 2231 switch (claim) { 2232 default: 2233 break; 2234 case NFS4_OPEN_CLAIM_PREVIOUS: 2235 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2236 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2237 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2238 case NFS4_OPEN_CLAIM_FH: 2239 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2240 } 2241 data->timestamp = jiffies; 2242 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2243 &data->o_arg.seq_args, 2244 &data->o_res.seq_res, 2245 task) != 0) 2246 nfs_release_seqid(data->o_arg.seqid); 2247 2248 /* Set the create mode (note dependency on the session type) */ 2249 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2250 if (data->o_arg.open_flags & O_EXCL) { 2251 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2252 if (nfs4_has_persistent_session(clp)) 2253 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2254 else if (clp->cl_mvops->minor_version > 0) 2255 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2256 } 2257 return; 2258 unlock_no_action: 2259 trace_nfs4_cached_open(data->state); 2260 rcu_read_unlock(); 2261 out_no_action: 2262 task->tk_action = NULL; 2263 out_wait: 2264 nfs4_sequence_done(task, &data->o_res.seq_res); 2265 } 2266 2267 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2268 { 2269 struct nfs4_opendata *data = calldata; 2270 2271 data->rpc_status = task->tk_status; 2272 2273 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2274 return; 2275 2276 if (task->tk_status == 0) { 2277 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2278 switch (data->o_res.f_attr->mode & S_IFMT) { 2279 case S_IFREG: 2280 break; 2281 case S_IFLNK: 2282 data->rpc_status = -ELOOP; 2283 break; 2284 case S_IFDIR: 2285 data->rpc_status = -EISDIR; 2286 break; 2287 default: 2288 data->rpc_status = -ENOTDIR; 2289 } 2290 } 2291 renew_lease(data->o_res.server, data->timestamp); 2292 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2293 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2294 } 2295 data->rpc_done = true; 2296 } 2297 2298 static void nfs4_open_release(void *calldata) 2299 { 2300 struct nfs4_opendata *data = calldata; 2301 struct nfs4_state *state = NULL; 2302 2303 /* If this request hasn't been cancelled, do nothing */ 2304 if (!data->cancelled) 2305 goto out_free; 2306 /* In case of error, no cleanup! */ 2307 if (data->rpc_status != 0 || !data->rpc_done) 2308 goto out_free; 2309 /* In case we need an open_confirm, no cleanup! */ 2310 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2311 goto out_free; 2312 state = nfs4_opendata_to_nfs4_state(data); 2313 if (!IS_ERR(state)) 2314 nfs4_close_state(state, data->o_arg.fmode); 2315 out_free: 2316 nfs4_opendata_put(data); 2317 } 2318 2319 static const struct rpc_call_ops nfs4_open_ops = { 2320 .rpc_call_prepare = nfs4_open_prepare, 2321 .rpc_call_done = nfs4_open_done, 2322 .rpc_release = nfs4_open_release, 2323 }; 2324 2325 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 2326 { 2327 struct inode *dir = d_inode(data->dir); 2328 struct nfs_server *server = NFS_SERVER(dir); 2329 struct nfs_openargs *o_arg = &data->o_arg; 2330 struct nfs_openres *o_res = &data->o_res; 2331 struct rpc_task *task; 2332 struct rpc_message msg = { 2333 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2334 .rpc_argp = o_arg, 2335 .rpc_resp = o_res, 2336 .rpc_cred = data->owner->so_cred, 2337 }; 2338 struct rpc_task_setup task_setup_data = { 2339 .rpc_client = server->client, 2340 .rpc_message = &msg, 2341 .callback_ops = &nfs4_open_ops, 2342 .callback_data = data, 2343 .workqueue = nfsiod_workqueue, 2344 .flags = RPC_TASK_ASYNC, 2345 }; 2346 int status; 2347 2348 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, isrecover); 2349 kref_get(&data->kref); 2350 data->rpc_done = false; 2351 data->rpc_status = 0; 2352 data->cancelled = false; 2353 data->is_recover = false; 2354 if (isrecover) 2355 data->is_recover = true; 2356 task = rpc_run_task(&task_setup_data); 2357 if (IS_ERR(task)) 2358 return PTR_ERR(task); 2359 status = rpc_wait_for_completion_task(task); 2360 if (status != 0) { 2361 data->cancelled = true; 2362 smp_wmb(); 2363 } else 2364 status = data->rpc_status; 2365 rpc_put_task(task); 2366 2367 return status; 2368 } 2369 2370 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2371 { 2372 struct inode *dir = d_inode(data->dir); 2373 struct nfs_openres *o_res = &data->o_res; 2374 int status; 2375 2376 status = nfs4_run_open_task(data, 1); 2377 if (status != 0 || !data->rpc_done) 2378 return status; 2379 2380 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2381 2382 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2383 status = _nfs4_proc_open_confirm(data); 2384 2385 return status; 2386 } 2387 2388 /* 2389 * Additional permission checks in order to distinguish between an 2390 * open for read, and an open for execute. This works around the 2391 * fact that NFSv4 OPEN treats read and execute permissions as being 2392 * the same. 2393 * Note that in the non-execute case, we want to turn off permission 2394 * checking if we just created a new file (POSIX open() semantics). 2395 */ 2396 static int nfs4_opendata_access(struct rpc_cred *cred, 2397 struct nfs4_opendata *opendata, 2398 struct nfs4_state *state, fmode_t fmode, 2399 int openflags) 2400 { 2401 struct nfs_access_entry cache; 2402 u32 mask, flags; 2403 2404 /* access call failed or for some reason the server doesn't 2405 * support any access modes -- defer access call until later */ 2406 if (opendata->o_res.access_supported == 0) 2407 return 0; 2408 2409 mask = 0; 2410 /* 2411 * Use openflags to check for exec, because fmode won't 2412 * always have FMODE_EXEC set when file open for exec. 2413 */ 2414 if (openflags & __FMODE_EXEC) { 2415 /* ONLY check for exec rights */ 2416 if (S_ISDIR(state->inode->i_mode)) 2417 mask = NFS4_ACCESS_LOOKUP; 2418 else 2419 mask = NFS4_ACCESS_EXECUTE; 2420 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2421 mask = NFS4_ACCESS_READ; 2422 2423 cache.cred = cred; 2424 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2425 nfs_access_add_cache(state->inode, &cache); 2426 2427 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2428 if ((mask & ~cache.mask & flags) == 0) 2429 return 0; 2430 2431 return -EACCES; 2432 } 2433 2434 /* 2435 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2436 */ 2437 static int _nfs4_proc_open(struct nfs4_opendata *data) 2438 { 2439 struct inode *dir = d_inode(data->dir); 2440 struct nfs_server *server = NFS_SERVER(dir); 2441 struct nfs_openargs *o_arg = &data->o_arg; 2442 struct nfs_openres *o_res = &data->o_res; 2443 int status; 2444 2445 status = nfs4_run_open_task(data, 0); 2446 if (!data->rpc_done) 2447 return status; 2448 if (status != 0) { 2449 if (status == -NFS4ERR_BADNAME && 2450 !(o_arg->open_flags & O_CREAT)) 2451 return -ENOENT; 2452 return status; 2453 } 2454 2455 nfs_fattr_map_and_free_names(server, &data->f_attr); 2456 2457 if (o_arg->open_flags & O_CREAT) { 2458 if (o_arg->open_flags & O_EXCL) 2459 data->file_created = true; 2460 else if (o_res->cinfo.before != o_res->cinfo.after) 2461 data->file_created = true; 2462 if (data->file_created || 2463 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2464 update_changeattr(dir, &o_res->cinfo, 2465 o_res->f_attr->time_start); 2466 } 2467 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2468 server->caps &= ~NFS_CAP_POSIX_LOCK; 2469 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2470 status = _nfs4_proc_open_confirm(data); 2471 if (status != 0) 2472 return status; 2473 } 2474 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2475 nfs4_sequence_free_slot(&o_res->seq_res); 2476 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2477 } 2478 return 0; 2479 } 2480 2481 /* 2482 * OPEN_EXPIRED: 2483 * reclaim state on the server after a network partition. 2484 * Assumes caller holds the appropriate lock 2485 */ 2486 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2487 { 2488 struct nfs4_opendata *opendata; 2489 int ret; 2490 2491 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2492 NFS4_OPEN_CLAIM_FH); 2493 if (IS_ERR(opendata)) 2494 return PTR_ERR(opendata); 2495 ret = nfs4_open_recover(opendata, state); 2496 if (ret == -ESTALE) 2497 d_drop(ctx->dentry); 2498 nfs4_opendata_put(opendata); 2499 return ret; 2500 } 2501 2502 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2503 { 2504 struct nfs_server *server = NFS_SERVER(state->inode); 2505 struct nfs4_exception exception = { }; 2506 int err; 2507 2508 do { 2509 err = _nfs4_open_expired(ctx, state); 2510 trace_nfs4_open_expired(ctx, 0, err); 2511 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2512 continue; 2513 switch (err) { 2514 default: 2515 goto out; 2516 case -NFS4ERR_GRACE: 2517 case -NFS4ERR_DELAY: 2518 nfs4_handle_exception(server, err, &exception); 2519 err = 0; 2520 } 2521 } while (exception.retry); 2522 out: 2523 return err; 2524 } 2525 2526 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2527 { 2528 struct nfs_open_context *ctx; 2529 int ret; 2530 2531 ctx = nfs4_state_find_open_context(state); 2532 if (IS_ERR(ctx)) 2533 return -EAGAIN; 2534 ret = nfs4_do_open_expired(ctx, state); 2535 put_nfs_open_context(ctx); 2536 return ret; 2537 } 2538 2539 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2540 const nfs4_stateid *stateid) 2541 { 2542 nfs_remove_bad_delegation(state->inode, stateid); 2543 write_seqlock(&state->seqlock); 2544 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2545 write_sequnlock(&state->seqlock); 2546 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2547 } 2548 2549 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2550 { 2551 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2552 nfs_finish_clear_delegation_stateid(state, NULL); 2553 } 2554 2555 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2556 { 2557 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2558 nfs40_clear_delegation_stateid(state); 2559 return nfs4_open_expired(sp, state); 2560 } 2561 2562 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2563 nfs4_stateid *stateid, 2564 struct rpc_cred *cred) 2565 { 2566 return -NFS4ERR_BAD_STATEID; 2567 } 2568 2569 #if defined(CONFIG_NFS_V4_1) 2570 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2571 nfs4_stateid *stateid, 2572 struct rpc_cred *cred) 2573 { 2574 int status; 2575 2576 switch (stateid->type) { 2577 default: 2578 break; 2579 case NFS4_INVALID_STATEID_TYPE: 2580 case NFS4_SPECIAL_STATEID_TYPE: 2581 return -NFS4ERR_BAD_STATEID; 2582 case NFS4_REVOKED_STATEID_TYPE: 2583 goto out_free; 2584 } 2585 2586 status = nfs41_test_stateid(server, stateid, cred); 2587 switch (status) { 2588 case -NFS4ERR_EXPIRED: 2589 case -NFS4ERR_ADMIN_REVOKED: 2590 case -NFS4ERR_DELEG_REVOKED: 2591 break; 2592 default: 2593 return status; 2594 } 2595 out_free: 2596 /* Ack the revoked state to the server */ 2597 nfs41_free_stateid(server, stateid, cred, true); 2598 return -NFS4ERR_EXPIRED; 2599 } 2600 2601 static void nfs41_check_delegation_stateid(struct nfs4_state *state) 2602 { 2603 struct nfs_server *server = NFS_SERVER(state->inode); 2604 nfs4_stateid stateid; 2605 struct nfs_delegation *delegation; 2606 struct rpc_cred *cred; 2607 int status; 2608 2609 /* Get the delegation credential for use by test/free_stateid */ 2610 rcu_read_lock(); 2611 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2612 if (delegation == NULL) { 2613 rcu_read_unlock(); 2614 return; 2615 } 2616 2617 nfs4_stateid_copy(&stateid, &delegation->stateid); 2618 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) || 2619 !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2620 &delegation->flags)) { 2621 rcu_read_unlock(); 2622 nfs_finish_clear_delegation_stateid(state, &stateid); 2623 return; 2624 } 2625 2626 cred = get_rpccred(delegation->cred); 2627 rcu_read_unlock(); 2628 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2629 trace_nfs4_test_delegation_stateid(state, NULL, status); 2630 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2631 nfs_finish_clear_delegation_stateid(state, &stateid); 2632 2633 put_rpccred(cred); 2634 } 2635 2636 /** 2637 * nfs41_check_expired_locks - possibly free a lock stateid 2638 * 2639 * @state: NFSv4 state for an inode 2640 * 2641 * Returns NFS_OK if recovery for this stateid is now finished. 2642 * Otherwise a negative NFS4ERR value is returned. 2643 */ 2644 static int nfs41_check_expired_locks(struct nfs4_state *state) 2645 { 2646 int status, ret = NFS_OK; 2647 struct nfs4_lock_state *lsp, *prev = NULL; 2648 struct nfs_server *server = NFS_SERVER(state->inode); 2649 2650 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2651 goto out; 2652 2653 spin_lock(&state->state_lock); 2654 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2655 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2656 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 2657 2658 refcount_inc(&lsp->ls_count); 2659 spin_unlock(&state->state_lock); 2660 2661 nfs4_put_lock_state(prev); 2662 prev = lsp; 2663 2664 status = nfs41_test_and_free_expired_stateid(server, 2665 &lsp->ls_stateid, 2666 cred); 2667 trace_nfs4_test_lock_stateid(state, lsp, status); 2668 if (status == -NFS4ERR_EXPIRED || 2669 status == -NFS4ERR_BAD_STATEID) { 2670 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2671 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2672 if (!recover_lost_locks) 2673 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2674 } else if (status != NFS_OK) { 2675 ret = status; 2676 nfs4_put_lock_state(prev); 2677 goto out; 2678 } 2679 spin_lock(&state->state_lock); 2680 } 2681 } 2682 spin_unlock(&state->state_lock); 2683 nfs4_put_lock_state(prev); 2684 out: 2685 return ret; 2686 } 2687 2688 /** 2689 * nfs41_check_open_stateid - possibly free an open stateid 2690 * 2691 * @state: NFSv4 state for an inode 2692 * 2693 * Returns NFS_OK if recovery for this stateid is now finished. 2694 * Otherwise a negative NFS4ERR value is returned. 2695 */ 2696 static int nfs41_check_open_stateid(struct nfs4_state *state) 2697 { 2698 struct nfs_server *server = NFS_SERVER(state->inode); 2699 nfs4_stateid *stateid = &state->open_stateid; 2700 struct rpc_cred *cred = state->owner->so_cred; 2701 int status; 2702 2703 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) { 2704 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) { 2705 if (nfs4_have_delegation(state->inode, state->state)) 2706 return NFS_OK; 2707 return -NFS4ERR_OPENMODE; 2708 } 2709 return -NFS4ERR_BAD_STATEID; 2710 } 2711 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2712 trace_nfs4_test_open_stateid(state, NULL, status); 2713 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2714 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2715 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2716 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2717 clear_bit(NFS_OPEN_STATE, &state->flags); 2718 stateid->type = NFS4_INVALID_STATEID_TYPE; 2719 return status; 2720 } 2721 if (nfs_open_stateid_recover_openmode(state)) 2722 return -NFS4ERR_OPENMODE; 2723 return NFS_OK; 2724 } 2725 2726 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2727 { 2728 int status; 2729 2730 nfs41_check_delegation_stateid(state); 2731 status = nfs41_check_expired_locks(state); 2732 if (status != NFS_OK) 2733 return status; 2734 status = nfs41_check_open_stateid(state); 2735 if (status != NFS_OK) 2736 status = nfs4_open_expired(sp, state); 2737 return status; 2738 } 2739 #endif 2740 2741 /* 2742 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2743 * fields corresponding to attributes that were used to store the verifier. 2744 * Make sure we clobber those fields in the later setattr call 2745 */ 2746 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2747 struct iattr *sattr, struct nfs4_label **label) 2748 { 2749 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 2750 __u32 attrset[3]; 2751 unsigned ret; 2752 unsigned i; 2753 2754 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 2755 attrset[i] = opendata->o_res.attrset[i]; 2756 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 2757 attrset[i] &= ~bitmask[i]; 2758 } 2759 2760 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 2761 sattr->ia_valid : 0; 2762 2763 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 2764 if (sattr->ia_valid & ATTR_ATIME_SET) 2765 ret |= ATTR_ATIME_SET; 2766 else 2767 ret |= ATTR_ATIME; 2768 } 2769 2770 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 2771 if (sattr->ia_valid & ATTR_MTIME_SET) 2772 ret |= ATTR_MTIME_SET; 2773 else 2774 ret |= ATTR_MTIME; 2775 } 2776 2777 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 2778 *label = NULL; 2779 return ret; 2780 } 2781 2782 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2783 fmode_t fmode, 2784 int flags, 2785 struct nfs_open_context *ctx) 2786 { 2787 struct nfs4_state_owner *sp = opendata->owner; 2788 struct nfs_server *server = sp->so_server; 2789 struct dentry *dentry; 2790 struct nfs4_state *state; 2791 unsigned int seq; 2792 int ret; 2793 2794 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2795 2796 ret = _nfs4_proc_open(opendata); 2797 if (ret != 0) 2798 goto out; 2799 2800 state = nfs4_opendata_to_nfs4_state(opendata); 2801 ret = PTR_ERR(state); 2802 if (IS_ERR(state)) 2803 goto out; 2804 ctx->state = state; 2805 if (server->caps & NFS_CAP_POSIX_LOCK) 2806 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2807 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 2808 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 2809 2810 dentry = opendata->dentry; 2811 if (d_really_is_negative(dentry)) { 2812 struct dentry *alias; 2813 d_drop(dentry); 2814 alias = d_exact_alias(dentry, state->inode); 2815 if (!alias) 2816 alias = d_splice_alias(igrab(state->inode), dentry); 2817 /* d_splice_alias() can't fail here - it's a non-directory */ 2818 if (alias) { 2819 dput(ctx->dentry); 2820 ctx->dentry = dentry = alias; 2821 } 2822 nfs_set_verifier(dentry, 2823 nfs_save_change_attribute(d_inode(opendata->dir))); 2824 } 2825 2826 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2827 if (ret != 0) 2828 goto out; 2829 2830 if (d_inode(dentry) == state->inode) { 2831 nfs_inode_attach_open_context(ctx); 2832 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2833 nfs4_schedule_stateid_recovery(server, state); 2834 } 2835 out: 2836 return ret; 2837 } 2838 2839 /* 2840 * Returns a referenced nfs4_state 2841 */ 2842 static int _nfs4_do_open(struct inode *dir, 2843 struct nfs_open_context *ctx, 2844 int flags, 2845 const struct nfs4_open_createattrs *c, 2846 int *opened) 2847 { 2848 struct nfs4_state_owner *sp; 2849 struct nfs4_state *state = NULL; 2850 struct nfs_server *server = NFS_SERVER(dir); 2851 struct nfs4_opendata *opendata; 2852 struct dentry *dentry = ctx->dentry; 2853 struct rpc_cred *cred = ctx->cred; 2854 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2855 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2856 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2857 struct iattr *sattr = c->sattr; 2858 struct nfs4_label *label = c->label; 2859 struct nfs4_label *olabel = NULL; 2860 int status; 2861 2862 /* Protect against reboot recovery conflicts */ 2863 status = -ENOMEM; 2864 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2865 if (sp == NULL) { 2866 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2867 goto out_err; 2868 } 2869 status = nfs4_client_recover_expired_lease(server->nfs_client); 2870 if (status != 0) 2871 goto err_put_state_owner; 2872 if (d_really_is_positive(dentry)) 2873 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 2874 status = -ENOMEM; 2875 if (d_really_is_positive(dentry)) 2876 claim = NFS4_OPEN_CLAIM_FH; 2877 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 2878 c, claim, GFP_KERNEL); 2879 if (opendata == NULL) 2880 goto err_put_state_owner; 2881 2882 if (label) { 2883 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2884 if (IS_ERR(olabel)) { 2885 status = PTR_ERR(olabel); 2886 goto err_opendata_put; 2887 } 2888 } 2889 2890 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2891 if (!opendata->f_attr.mdsthreshold) { 2892 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2893 if (!opendata->f_attr.mdsthreshold) 2894 goto err_free_label; 2895 } 2896 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2897 } 2898 if (d_really_is_positive(dentry)) 2899 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 2900 2901 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2902 if (status != 0) 2903 goto err_free_label; 2904 state = ctx->state; 2905 2906 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 2907 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2908 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 2909 /* 2910 * send create attributes which was not set by open 2911 * with an extra setattr. 2912 */ 2913 if (attrs || label) { 2914 unsigned ia_old = sattr->ia_valid; 2915 2916 sattr->ia_valid = attrs; 2917 nfs_fattr_init(opendata->o_res.f_attr); 2918 status = nfs4_do_setattr(state->inode, cred, 2919 opendata->o_res.f_attr, sattr, 2920 ctx, label, olabel); 2921 if (status == 0) { 2922 nfs_setattr_update_inode(state->inode, sattr, 2923 opendata->o_res.f_attr); 2924 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2925 } 2926 sattr->ia_valid = ia_old; 2927 } 2928 } 2929 if (opened && opendata->file_created) 2930 *opened |= FILE_CREATED; 2931 2932 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2933 *ctx_th = opendata->f_attr.mdsthreshold; 2934 opendata->f_attr.mdsthreshold = NULL; 2935 } 2936 2937 nfs4_label_free(olabel); 2938 2939 nfs4_opendata_put(opendata); 2940 nfs4_put_state_owner(sp); 2941 return 0; 2942 err_free_label: 2943 nfs4_label_free(olabel); 2944 err_opendata_put: 2945 nfs4_opendata_put(opendata); 2946 err_put_state_owner: 2947 nfs4_put_state_owner(sp); 2948 out_err: 2949 return status; 2950 } 2951 2952 2953 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2954 struct nfs_open_context *ctx, 2955 int flags, 2956 struct iattr *sattr, 2957 struct nfs4_label *label, 2958 int *opened) 2959 { 2960 struct nfs_server *server = NFS_SERVER(dir); 2961 struct nfs4_exception exception = { }; 2962 struct nfs4_state *res; 2963 struct nfs4_open_createattrs c = { 2964 .label = label, 2965 .sattr = sattr, 2966 .verf = { 2967 [0] = (__u32)jiffies, 2968 [1] = (__u32)current->pid, 2969 }, 2970 }; 2971 int status; 2972 2973 do { 2974 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 2975 res = ctx->state; 2976 trace_nfs4_open_file(ctx, flags, status); 2977 if (status == 0) 2978 break; 2979 /* NOTE: BAD_SEQID means the server and client disagree about the 2980 * book-keeping w.r.t. state-changing operations 2981 * (OPEN/CLOSE/LOCK/LOCKU...) 2982 * It is actually a sign of a bug on the client or on the server. 2983 * 2984 * If we receive a BAD_SEQID error in the particular case of 2985 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2986 * have unhashed the old state_owner for us, and that we can 2987 * therefore safely retry using a new one. We should still warn 2988 * the user though... 2989 */ 2990 if (status == -NFS4ERR_BAD_SEQID) { 2991 pr_warn_ratelimited("NFS: v4 server %s " 2992 " returned a bad sequence-id error!\n", 2993 NFS_SERVER(dir)->nfs_client->cl_hostname); 2994 exception.retry = 1; 2995 continue; 2996 } 2997 /* 2998 * BAD_STATEID on OPEN means that the server cancelled our 2999 * state before it received the OPEN_CONFIRM. 3000 * Recover by retrying the request as per the discussion 3001 * on Page 181 of RFC3530. 3002 */ 3003 if (status == -NFS4ERR_BAD_STATEID) { 3004 exception.retry = 1; 3005 continue; 3006 } 3007 if (status == -EAGAIN) { 3008 /* We must have found a delegation */ 3009 exception.retry = 1; 3010 continue; 3011 } 3012 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3013 continue; 3014 res = ERR_PTR(nfs4_handle_exception(server, 3015 status, &exception)); 3016 } while (exception.retry); 3017 return res; 3018 } 3019 3020 static int _nfs4_do_setattr(struct inode *inode, 3021 struct nfs_setattrargs *arg, 3022 struct nfs_setattrres *res, 3023 struct rpc_cred *cred, 3024 struct nfs_open_context *ctx) 3025 { 3026 struct nfs_server *server = NFS_SERVER(inode); 3027 struct rpc_message msg = { 3028 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3029 .rpc_argp = arg, 3030 .rpc_resp = res, 3031 .rpc_cred = cred, 3032 }; 3033 struct rpc_cred *delegation_cred = NULL; 3034 unsigned long timestamp = jiffies; 3035 fmode_t fmode; 3036 bool truncate; 3037 int status; 3038 3039 nfs_fattr_init(res->fattr); 3040 3041 /* Servers should only apply open mode checks for file size changes */ 3042 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3043 fmode = truncate ? FMODE_WRITE : FMODE_READ; 3044 3045 if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) { 3046 /* Use that stateid */ 3047 } else if (truncate && ctx != NULL) { 3048 struct nfs_lock_context *l_ctx; 3049 if (!nfs4_valid_open_stateid(ctx->state)) 3050 return -EBADF; 3051 l_ctx = nfs_get_lock_context(ctx); 3052 if (IS_ERR(l_ctx)) 3053 return PTR_ERR(l_ctx); 3054 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3055 &arg->stateid, &delegation_cred); 3056 nfs_put_lock_context(l_ctx); 3057 if (status == -EIO) 3058 return -EBADF; 3059 } else 3060 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3061 if (delegation_cred) 3062 msg.rpc_cred = delegation_cred; 3063 3064 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3065 3066 put_rpccred(delegation_cred); 3067 if (status == 0 && ctx != NULL) 3068 renew_lease(server, timestamp); 3069 trace_nfs4_setattr(inode, &arg->stateid, status); 3070 return status; 3071 } 3072 3073 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 3074 struct nfs_fattr *fattr, struct iattr *sattr, 3075 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 3076 struct nfs4_label *olabel) 3077 { 3078 struct nfs_server *server = NFS_SERVER(inode); 3079 struct nfs4_state *state = ctx ? ctx->state : NULL; 3080 struct nfs_setattrargs arg = { 3081 .fh = NFS_FH(inode), 3082 .iap = sattr, 3083 .server = server, 3084 .bitmask = server->attr_bitmask, 3085 .label = ilabel, 3086 }; 3087 struct nfs_setattrres res = { 3088 .fattr = fattr, 3089 .label = olabel, 3090 .server = server, 3091 }; 3092 struct nfs4_exception exception = { 3093 .state = state, 3094 .inode = inode, 3095 .stateid = &arg.stateid, 3096 }; 3097 int err; 3098 3099 arg.bitmask = nfs4_bitmask(server, ilabel); 3100 if (ilabel) 3101 arg.bitmask = nfs4_bitmask(server, olabel); 3102 3103 do { 3104 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3105 switch (err) { 3106 case -NFS4ERR_OPENMODE: 3107 if (!(sattr->ia_valid & ATTR_SIZE)) { 3108 pr_warn_once("NFSv4: server %s is incorrectly " 3109 "applying open mode checks to " 3110 "a SETATTR that is not " 3111 "changing file size.\n", 3112 server->nfs_client->cl_hostname); 3113 } 3114 if (state && !(state->state & FMODE_WRITE)) { 3115 err = -EBADF; 3116 if (sattr->ia_valid & ATTR_OPEN) 3117 err = -EACCES; 3118 goto out; 3119 } 3120 } 3121 err = nfs4_handle_exception(server, err, &exception); 3122 } while (exception.retry); 3123 out: 3124 return err; 3125 } 3126 3127 static bool 3128 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3129 { 3130 if (inode == NULL || !nfs_have_layout(inode)) 3131 return false; 3132 3133 return pnfs_wait_on_layoutreturn(inode, task); 3134 } 3135 3136 struct nfs4_closedata { 3137 struct inode *inode; 3138 struct nfs4_state *state; 3139 struct nfs_closeargs arg; 3140 struct nfs_closeres res; 3141 struct { 3142 struct nfs4_layoutreturn_args arg; 3143 struct nfs4_layoutreturn_res res; 3144 struct nfs4_xdr_opaque_data ld_private; 3145 u32 roc_barrier; 3146 bool roc; 3147 } lr; 3148 struct nfs_fattr fattr; 3149 unsigned long timestamp; 3150 }; 3151 3152 static void nfs4_free_closedata(void *data) 3153 { 3154 struct nfs4_closedata *calldata = data; 3155 struct nfs4_state_owner *sp = calldata->state->owner; 3156 struct super_block *sb = calldata->state->inode->i_sb; 3157 3158 if (calldata->lr.roc) 3159 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3160 calldata->res.lr_ret); 3161 nfs4_put_open_state(calldata->state); 3162 nfs_free_seqid(calldata->arg.seqid); 3163 nfs4_put_state_owner(sp); 3164 nfs_sb_deactive(sb); 3165 kfree(calldata); 3166 } 3167 3168 static void nfs4_close_done(struct rpc_task *task, void *data) 3169 { 3170 struct nfs4_closedata *calldata = data; 3171 struct nfs4_state *state = calldata->state; 3172 struct nfs_server *server = NFS_SERVER(calldata->inode); 3173 nfs4_stateid *res_stateid = NULL; 3174 struct nfs4_exception exception = { 3175 .state = state, 3176 .inode = calldata->inode, 3177 .stateid = &calldata->arg.stateid, 3178 }; 3179 3180 dprintk("%s: begin!\n", __func__); 3181 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3182 return; 3183 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3184 3185 /* Handle Layoutreturn errors */ 3186 if (calldata->arg.lr_args && task->tk_status != 0) { 3187 switch (calldata->res.lr_ret) { 3188 default: 3189 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3190 break; 3191 case 0: 3192 calldata->arg.lr_args = NULL; 3193 calldata->res.lr_res = NULL; 3194 break; 3195 case -NFS4ERR_OLD_STATEID: 3196 if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid, 3197 calldata->inode)) 3198 goto lr_restart; 3199 /* Fallthrough */ 3200 case -NFS4ERR_ADMIN_REVOKED: 3201 case -NFS4ERR_DELEG_REVOKED: 3202 case -NFS4ERR_EXPIRED: 3203 case -NFS4ERR_BAD_STATEID: 3204 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 3205 case -NFS4ERR_WRONG_CRED: 3206 calldata->arg.lr_args = NULL; 3207 calldata->res.lr_res = NULL; 3208 goto lr_restart; 3209 } 3210 } 3211 3212 /* hmm. we are done with the inode, and in the process of freeing 3213 * the state_owner. we keep this around to process errors 3214 */ 3215 switch (task->tk_status) { 3216 case 0: 3217 res_stateid = &calldata->res.stateid; 3218 renew_lease(server, calldata->timestamp); 3219 break; 3220 case -NFS4ERR_ACCESS: 3221 if (calldata->arg.bitmask != NULL) { 3222 calldata->arg.bitmask = NULL; 3223 calldata->res.fattr = NULL; 3224 goto out_restart; 3225 3226 } 3227 break; 3228 case -NFS4ERR_OLD_STATEID: 3229 /* Did we race with OPEN? */ 3230 if (nfs4_refresh_open_stateid(&calldata->arg.stateid, 3231 state)) 3232 goto out_restart; 3233 goto out_release; 3234 case -NFS4ERR_ADMIN_REVOKED: 3235 case -NFS4ERR_STALE_STATEID: 3236 case -NFS4ERR_EXPIRED: 3237 nfs4_free_revoked_stateid(server, 3238 &calldata->arg.stateid, 3239 task->tk_msg.rpc_cred); 3240 /* Fallthrough */ 3241 case -NFS4ERR_BAD_STATEID: 3242 break; 3243 default: 3244 task->tk_status = nfs4_async_handle_exception(task, 3245 server, task->tk_status, &exception); 3246 if (exception.retry) 3247 goto out_restart; 3248 } 3249 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3250 res_stateid, calldata->arg.fmode); 3251 out_release: 3252 task->tk_status = 0; 3253 nfs_release_seqid(calldata->arg.seqid); 3254 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3255 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 3256 return; 3257 lr_restart: 3258 calldata->res.lr_ret = 0; 3259 out_restart: 3260 task->tk_status = 0; 3261 rpc_restart_call_prepare(task); 3262 goto out_release; 3263 } 3264 3265 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3266 { 3267 struct nfs4_closedata *calldata = data; 3268 struct nfs4_state *state = calldata->state; 3269 struct inode *inode = calldata->inode; 3270 bool is_rdonly, is_wronly, is_rdwr; 3271 int call_close = 0; 3272 3273 dprintk("%s: begin!\n", __func__); 3274 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3275 goto out_wait; 3276 3277 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3278 spin_lock(&state->owner->so_lock); 3279 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3280 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3281 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3282 /* Calculate the change in open mode */ 3283 calldata->arg.fmode = 0; 3284 if (state->n_rdwr == 0) { 3285 if (state->n_rdonly == 0) 3286 call_close |= is_rdonly; 3287 else if (is_rdonly) 3288 calldata->arg.fmode |= FMODE_READ; 3289 if (state->n_wronly == 0) 3290 call_close |= is_wronly; 3291 else if (is_wronly) 3292 calldata->arg.fmode |= FMODE_WRITE; 3293 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3294 call_close |= is_rdwr; 3295 } else if (is_rdwr) 3296 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3297 3298 if (!nfs4_valid_open_stateid(state) || 3299 !nfs4_refresh_open_stateid(&calldata->arg.stateid, state)) 3300 call_close = 0; 3301 spin_unlock(&state->owner->so_lock); 3302 3303 if (!call_close) { 3304 /* Note: exit _without_ calling nfs4_close_done */ 3305 goto out_no_action; 3306 } 3307 3308 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3309 nfs_release_seqid(calldata->arg.seqid); 3310 goto out_wait; 3311 } 3312 3313 if (calldata->arg.fmode == 0) 3314 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3315 3316 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3317 /* Close-to-open cache consistency revalidation */ 3318 if (!nfs4_have_delegation(inode, FMODE_READ)) 3319 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3320 else 3321 calldata->arg.bitmask = NULL; 3322 } 3323 3324 calldata->arg.share_access = 3325 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3326 calldata->arg.fmode, 0); 3327 3328 if (calldata->res.fattr == NULL) 3329 calldata->arg.bitmask = NULL; 3330 else if (calldata->arg.bitmask == NULL) 3331 calldata->res.fattr = NULL; 3332 calldata->timestamp = jiffies; 3333 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3334 &calldata->arg.seq_args, 3335 &calldata->res.seq_res, 3336 task) != 0) 3337 nfs_release_seqid(calldata->arg.seqid); 3338 dprintk("%s: done!\n", __func__); 3339 return; 3340 out_no_action: 3341 task->tk_action = NULL; 3342 out_wait: 3343 nfs4_sequence_done(task, &calldata->res.seq_res); 3344 } 3345 3346 static const struct rpc_call_ops nfs4_close_ops = { 3347 .rpc_call_prepare = nfs4_close_prepare, 3348 .rpc_call_done = nfs4_close_done, 3349 .rpc_release = nfs4_free_closedata, 3350 }; 3351 3352 /* 3353 * It is possible for data to be read/written from a mem-mapped file 3354 * after the sys_close call (which hits the vfs layer as a flush). 3355 * This means that we can't safely call nfsv4 close on a file until 3356 * the inode is cleared. This in turn means that we are not good 3357 * NFSv4 citizens - we do not indicate to the server to update the file's 3358 * share state even when we are done with one of the three share 3359 * stateid's in the inode. 3360 * 3361 * NOTE: Caller must be holding the sp->so_owner semaphore! 3362 */ 3363 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3364 { 3365 struct nfs_server *server = NFS_SERVER(state->inode); 3366 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3367 struct nfs4_closedata *calldata; 3368 struct nfs4_state_owner *sp = state->owner; 3369 struct rpc_task *task; 3370 struct rpc_message msg = { 3371 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3372 .rpc_cred = state->owner->so_cred, 3373 }; 3374 struct rpc_task_setup task_setup_data = { 3375 .rpc_client = server->client, 3376 .rpc_message = &msg, 3377 .callback_ops = &nfs4_close_ops, 3378 .workqueue = nfsiod_workqueue, 3379 .flags = RPC_TASK_ASYNC, 3380 }; 3381 int status = -ENOMEM; 3382 3383 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3384 &task_setup_data.rpc_client, &msg); 3385 3386 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3387 if (calldata == NULL) 3388 goto out; 3389 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3390 calldata->inode = state->inode; 3391 calldata->state = state; 3392 calldata->arg.fh = NFS_FH(state->inode); 3393 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3394 goto out_free_calldata; 3395 /* Serialization for the sequence id */ 3396 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3397 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3398 if (IS_ERR(calldata->arg.seqid)) 3399 goto out_free_calldata; 3400 nfs_fattr_init(&calldata->fattr); 3401 calldata->arg.fmode = 0; 3402 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3403 calldata->res.fattr = &calldata->fattr; 3404 calldata->res.seqid = calldata->arg.seqid; 3405 calldata->res.server = server; 3406 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3407 calldata->lr.roc = pnfs_roc(state->inode, 3408 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3409 if (calldata->lr.roc) { 3410 calldata->arg.lr_args = &calldata->lr.arg; 3411 calldata->res.lr_res = &calldata->lr.res; 3412 } 3413 nfs_sb_active(calldata->inode->i_sb); 3414 3415 msg.rpc_argp = &calldata->arg; 3416 msg.rpc_resp = &calldata->res; 3417 task_setup_data.callback_data = calldata; 3418 task = rpc_run_task(&task_setup_data); 3419 if (IS_ERR(task)) 3420 return PTR_ERR(task); 3421 status = 0; 3422 if (wait) 3423 status = rpc_wait_for_completion_task(task); 3424 rpc_put_task(task); 3425 return status; 3426 out_free_calldata: 3427 kfree(calldata); 3428 out: 3429 nfs4_put_open_state(state); 3430 nfs4_put_state_owner(sp); 3431 return status; 3432 } 3433 3434 static struct inode * 3435 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3436 int open_flags, struct iattr *attr, int *opened) 3437 { 3438 struct nfs4_state *state; 3439 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3440 3441 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3442 3443 /* Protect against concurrent sillydeletes */ 3444 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3445 3446 nfs4_label_release_security(label); 3447 3448 if (IS_ERR(state)) 3449 return ERR_CAST(state); 3450 return state->inode; 3451 } 3452 3453 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3454 { 3455 if (ctx->state == NULL) 3456 return; 3457 if (is_sync) 3458 nfs4_close_sync(ctx->state, ctx->mode); 3459 else 3460 nfs4_close_state(ctx->state, ctx->mode); 3461 } 3462 3463 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3464 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3465 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL) 3466 3467 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3468 { 3469 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3470 struct nfs4_server_caps_arg args = { 3471 .fhandle = fhandle, 3472 .bitmask = bitmask, 3473 }; 3474 struct nfs4_server_caps_res res = {}; 3475 struct rpc_message msg = { 3476 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3477 .rpc_argp = &args, 3478 .rpc_resp = &res, 3479 }; 3480 int status; 3481 int i; 3482 3483 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3484 FATTR4_WORD0_FH_EXPIRE_TYPE | 3485 FATTR4_WORD0_LINK_SUPPORT | 3486 FATTR4_WORD0_SYMLINK_SUPPORT | 3487 FATTR4_WORD0_ACLSUPPORT; 3488 if (minorversion) 3489 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3490 3491 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3492 if (status == 0) { 3493 /* Sanity check the server answers */ 3494 switch (minorversion) { 3495 case 0: 3496 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3497 res.attr_bitmask[2] = 0; 3498 break; 3499 case 1: 3500 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3501 break; 3502 case 2: 3503 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3504 } 3505 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3506 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3507 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3508 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3509 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3510 NFS_CAP_CTIME|NFS_CAP_MTIME| 3511 NFS_CAP_SECURITY_LABEL); 3512 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3513 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3514 server->caps |= NFS_CAP_ACLS; 3515 if (res.has_links != 0) 3516 server->caps |= NFS_CAP_HARDLINKS; 3517 if (res.has_symlinks != 0) 3518 server->caps |= NFS_CAP_SYMLINKS; 3519 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3520 server->caps |= NFS_CAP_FILEID; 3521 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3522 server->caps |= NFS_CAP_MODE; 3523 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3524 server->caps |= NFS_CAP_NLINK; 3525 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3526 server->caps |= NFS_CAP_OWNER; 3527 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3528 server->caps |= NFS_CAP_OWNER_GROUP; 3529 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3530 server->caps |= NFS_CAP_ATIME; 3531 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3532 server->caps |= NFS_CAP_CTIME; 3533 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3534 server->caps |= NFS_CAP_MTIME; 3535 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3536 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3537 server->caps |= NFS_CAP_SECURITY_LABEL; 3538 #endif 3539 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3540 sizeof(server->attr_bitmask)); 3541 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3542 3543 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3544 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3545 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3546 server->cache_consistency_bitmask[2] = 0; 3547 3548 /* Avoid a regression due to buggy server */ 3549 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3550 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3551 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3552 sizeof(server->exclcreat_bitmask)); 3553 3554 server->acl_bitmask = res.acl_bitmask; 3555 server->fh_expire_type = res.fh_expire_type; 3556 } 3557 3558 return status; 3559 } 3560 3561 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3562 { 3563 struct nfs4_exception exception = { }; 3564 int err; 3565 do { 3566 err = nfs4_handle_exception(server, 3567 _nfs4_server_capabilities(server, fhandle), 3568 &exception); 3569 } while (exception.retry); 3570 return err; 3571 } 3572 3573 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3574 struct nfs_fsinfo *info) 3575 { 3576 u32 bitmask[3]; 3577 struct nfs4_lookup_root_arg args = { 3578 .bitmask = bitmask, 3579 }; 3580 struct nfs4_lookup_res res = { 3581 .server = server, 3582 .fattr = info->fattr, 3583 .fh = fhandle, 3584 }; 3585 struct rpc_message msg = { 3586 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3587 .rpc_argp = &args, 3588 .rpc_resp = &res, 3589 }; 3590 3591 bitmask[0] = nfs4_fattr_bitmap[0]; 3592 bitmask[1] = nfs4_fattr_bitmap[1]; 3593 /* 3594 * Process the label in the upcoming getfattr 3595 */ 3596 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3597 3598 nfs_fattr_init(info->fattr); 3599 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3600 } 3601 3602 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3603 struct nfs_fsinfo *info) 3604 { 3605 struct nfs4_exception exception = { }; 3606 int err; 3607 do { 3608 err = _nfs4_lookup_root(server, fhandle, info); 3609 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3610 switch (err) { 3611 case 0: 3612 case -NFS4ERR_WRONGSEC: 3613 goto out; 3614 default: 3615 err = nfs4_handle_exception(server, err, &exception); 3616 } 3617 } while (exception.retry); 3618 out: 3619 return err; 3620 } 3621 3622 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3623 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3624 { 3625 struct rpc_auth_create_args auth_args = { 3626 .pseudoflavor = flavor, 3627 }; 3628 struct rpc_auth *auth; 3629 3630 auth = rpcauth_create(&auth_args, server->client); 3631 if (IS_ERR(auth)) 3632 return -EACCES; 3633 return nfs4_lookup_root(server, fhandle, info); 3634 } 3635 3636 /* 3637 * Retry pseudoroot lookup with various security flavors. We do this when: 3638 * 3639 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3640 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3641 * 3642 * Returns zero on success, or a negative NFS4ERR value, or a 3643 * negative errno value. 3644 */ 3645 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3646 struct nfs_fsinfo *info) 3647 { 3648 /* Per 3530bis 15.33.5 */ 3649 static const rpc_authflavor_t flav_array[] = { 3650 RPC_AUTH_GSS_KRB5P, 3651 RPC_AUTH_GSS_KRB5I, 3652 RPC_AUTH_GSS_KRB5, 3653 RPC_AUTH_UNIX, /* courtesy */ 3654 RPC_AUTH_NULL, 3655 }; 3656 int status = -EPERM; 3657 size_t i; 3658 3659 if (server->auth_info.flavor_len > 0) { 3660 /* try each flavor specified by user */ 3661 for (i = 0; i < server->auth_info.flavor_len; i++) { 3662 status = nfs4_lookup_root_sec(server, fhandle, info, 3663 server->auth_info.flavors[i]); 3664 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3665 continue; 3666 break; 3667 } 3668 } else { 3669 /* no flavors specified by user, try default list */ 3670 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3671 status = nfs4_lookup_root_sec(server, fhandle, info, 3672 flav_array[i]); 3673 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3674 continue; 3675 break; 3676 } 3677 } 3678 3679 /* 3680 * -EACCESS could mean that the user doesn't have correct permissions 3681 * to access the mount. It could also mean that we tried to mount 3682 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3683 * existing mount programs don't handle -EACCES very well so it should 3684 * be mapped to -EPERM instead. 3685 */ 3686 if (status == -EACCES) 3687 status = -EPERM; 3688 return status; 3689 } 3690 3691 /** 3692 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3693 * @server: initialized nfs_server handle 3694 * @fhandle: we fill in the pseudo-fs root file handle 3695 * @info: we fill in an FSINFO struct 3696 * @auth_probe: probe the auth flavours 3697 * 3698 * Returns zero on success, or a negative errno. 3699 */ 3700 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3701 struct nfs_fsinfo *info, 3702 bool auth_probe) 3703 { 3704 int status = 0; 3705 3706 if (!auth_probe) 3707 status = nfs4_lookup_root(server, fhandle, info); 3708 3709 if (auth_probe || status == NFS4ERR_WRONGSEC) 3710 status = server->nfs_client->cl_mvops->find_root_sec(server, 3711 fhandle, info); 3712 3713 if (status == 0) 3714 status = nfs4_server_capabilities(server, fhandle); 3715 if (status == 0) 3716 status = nfs4_do_fsinfo(server, fhandle, info); 3717 3718 return nfs4_map_errors(status); 3719 } 3720 3721 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3722 struct nfs_fsinfo *info) 3723 { 3724 int error; 3725 struct nfs_fattr *fattr = info->fattr; 3726 struct nfs4_label *label = NULL; 3727 3728 error = nfs4_server_capabilities(server, mntfh); 3729 if (error < 0) { 3730 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3731 return error; 3732 } 3733 3734 label = nfs4_label_alloc(server, GFP_KERNEL); 3735 if (IS_ERR(label)) 3736 return PTR_ERR(label); 3737 3738 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3739 if (error < 0) { 3740 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3741 goto err_free_label; 3742 } 3743 3744 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3745 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3746 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3747 3748 err_free_label: 3749 nfs4_label_free(label); 3750 3751 return error; 3752 } 3753 3754 /* 3755 * Get locations and (maybe) other attributes of a referral. 3756 * Note that we'll actually follow the referral later when 3757 * we detect fsid mismatch in inode revalidation 3758 */ 3759 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3760 const struct qstr *name, struct nfs_fattr *fattr, 3761 struct nfs_fh *fhandle) 3762 { 3763 int status = -ENOMEM; 3764 struct page *page = NULL; 3765 struct nfs4_fs_locations *locations = NULL; 3766 3767 page = alloc_page(GFP_KERNEL); 3768 if (page == NULL) 3769 goto out; 3770 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3771 if (locations == NULL) 3772 goto out; 3773 3774 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3775 if (status != 0) 3776 goto out; 3777 3778 /* 3779 * If the fsid didn't change, this is a migration event, not a 3780 * referral. Cause us to drop into the exception handler, which 3781 * will kick off migration recovery. 3782 */ 3783 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3784 dprintk("%s: server did not return a different fsid for" 3785 " a referral at %s\n", __func__, name->name); 3786 status = -NFS4ERR_MOVED; 3787 goto out; 3788 } 3789 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3790 nfs_fixup_referral_attributes(&locations->fattr); 3791 3792 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3793 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3794 memset(fhandle, 0, sizeof(struct nfs_fh)); 3795 out: 3796 if (page) 3797 __free_page(page); 3798 kfree(locations); 3799 return status; 3800 } 3801 3802 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3803 struct nfs_fattr *fattr, struct nfs4_label *label) 3804 { 3805 struct nfs4_getattr_arg args = { 3806 .fh = fhandle, 3807 .bitmask = server->attr_bitmask, 3808 }; 3809 struct nfs4_getattr_res res = { 3810 .fattr = fattr, 3811 .label = label, 3812 .server = server, 3813 }; 3814 struct rpc_message msg = { 3815 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3816 .rpc_argp = &args, 3817 .rpc_resp = &res, 3818 }; 3819 3820 args.bitmask = nfs4_bitmask(server, label); 3821 3822 nfs_fattr_init(fattr); 3823 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3824 } 3825 3826 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3827 struct nfs_fattr *fattr, struct nfs4_label *label) 3828 { 3829 struct nfs4_exception exception = { }; 3830 int err; 3831 do { 3832 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3833 trace_nfs4_getattr(server, fhandle, fattr, err); 3834 err = nfs4_handle_exception(server, err, 3835 &exception); 3836 } while (exception.retry); 3837 return err; 3838 } 3839 3840 /* 3841 * The file is not closed if it is opened due to the a request to change 3842 * the size of the file. The open call will not be needed once the 3843 * VFS layer lookup-intents are implemented. 3844 * 3845 * Close is called when the inode is destroyed. 3846 * If we haven't opened the file for O_WRONLY, we 3847 * need to in the size_change case to obtain a stateid. 3848 * 3849 * Got race? 3850 * Because OPEN is always done by name in nfsv4, it is 3851 * possible that we opened a different file by the same 3852 * name. We can recognize this race condition, but we 3853 * can't do anything about it besides returning an error. 3854 * 3855 * This will be fixed with VFS changes (lookup-intent). 3856 */ 3857 static int 3858 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3859 struct iattr *sattr) 3860 { 3861 struct inode *inode = d_inode(dentry); 3862 struct rpc_cred *cred = NULL; 3863 struct nfs_open_context *ctx = NULL; 3864 struct nfs4_label *label = NULL; 3865 int status; 3866 3867 if (pnfs_ld_layoutret_on_setattr(inode) && 3868 sattr->ia_valid & ATTR_SIZE && 3869 sattr->ia_size < i_size_read(inode)) 3870 pnfs_commit_and_return_layout(inode); 3871 3872 nfs_fattr_init(fattr); 3873 3874 /* Deal with open(O_TRUNC) */ 3875 if (sattr->ia_valid & ATTR_OPEN) 3876 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3877 3878 /* Optimization: if the end result is no change, don't RPC */ 3879 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3880 return 0; 3881 3882 /* Search for an existing open(O_WRITE) file */ 3883 if (sattr->ia_valid & ATTR_FILE) { 3884 3885 ctx = nfs_file_open_context(sattr->ia_file); 3886 if (ctx) 3887 cred = ctx->cred; 3888 } 3889 3890 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3891 if (IS_ERR(label)) 3892 return PTR_ERR(label); 3893 3894 /* Return any delegations if we're going to change ACLs */ 3895 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 3896 nfs4_inode_make_writeable(inode); 3897 3898 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label); 3899 if (status == 0) { 3900 nfs_setattr_update_inode(inode, sattr, fattr); 3901 nfs_setsecurity(inode, fattr, label); 3902 } 3903 nfs4_label_free(label); 3904 return status; 3905 } 3906 3907 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3908 const struct qstr *name, struct nfs_fh *fhandle, 3909 struct nfs_fattr *fattr, struct nfs4_label *label) 3910 { 3911 struct nfs_server *server = NFS_SERVER(dir); 3912 int status; 3913 struct nfs4_lookup_arg args = { 3914 .bitmask = server->attr_bitmask, 3915 .dir_fh = NFS_FH(dir), 3916 .name = name, 3917 }; 3918 struct nfs4_lookup_res res = { 3919 .server = server, 3920 .fattr = fattr, 3921 .label = label, 3922 .fh = fhandle, 3923 }; 3924 struct rpc_message msg = { 3925 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3926 .rpc_argp = &args, 3927 .rpc_resp = &res, 3928 }; 3929 3930 args.bitmask = nfs4_bitmask(server, label); 3931 3932 nfs_fattr_init(fattr); 3933 3934 dprintk("NFS call lookup %s\n", name->name); 3935 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3936 dprintk("NFS reply lookup: %d\n", status); 3937 return status; 3938 } 3939 3940 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3941 { 3942 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3943 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3944 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3945 fattr->nlink = 2; 3946 } 3947 3948 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3949 const struct qstr *name, struct nfs_fh *fhandle, 3950 struct nfs_fattr *fattr, struct nfs4_label *label) 3951 { 3952 struct nfs4_exception exception = { }; 3953 struct rpc_clnt *client = *clnt; 3954 int err; 3955 do { 3956 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3957 trace_nfs4_lookup(dir, name, err); 3958 switch (err) { 3959 case -NFS4ERR_BADNAME: 3960 err = -ENOENT; 3961 goto out; 3962 case -NFS4ERR_MOVED: 3963 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3964 if (err == -NFS4ERR_MOVED) 3965 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3966 goto out; 3967 case -NFS4ERR_WRONGSEC: 3968 err = -EPERM; 3969 if (client != *clnt) 3970 goto out; 3971 client = nfs4_negotiate_security(client, dir, name); 3972 if (IS_ERR(client)) 3973 return PTR_ERR(client); 3974 3975 exception.retry = 1; 3976 break; 3977 default: 3978 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3979 } 3980 } while (exception.retry); 3981 3982 out: 3983 if (err == 0) 3984 *clnt = client; 3985 else if (client != *clnt) 3986 rpc_shutdown_client(client); 3987 3988 return err; 3989 } 3990 3991 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 3992 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3993 struct nfs4_label *label) 3994 { 3995 int status; 3996 struct rpc_clnt *client = NFS_CLIENT(dir); 3997 3998 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3999 if (client != NFS_CLIENT(dir)) { 4000 rpc_shutdown_client(client); 4001 nfs_fixup_secinfo_attributes(fattr); 4002 } 4003 return status; 4004 } 4005 4006 struct rpc_clnt * 4007 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name, 4008 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4009 { 4010 struct rpc_clnt *client = NFS_CLIENT(dir); 4011 int status; 4012 4013 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 4014 if (status < 0) 4015 return ERR_PTR(status); 4016 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4017 } 4018 4019 static int _nfs4_proc_lookupp(struct inode *inode, 4020 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4021 struct nfs4_label *label) 4022 { 4023 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4024 struct nfs_server *server = NFS_SERVER(inode); 4025 int status; 4026 struct nfs4_lookupp_arg args = { 4027 .bitmask = server->attr_bitmask, 4028 .fh = NFS_FH(inode), 4029 }; 4030 struct nfs4_lookupp_res res = { 4031 .server = server, 4032 .fattr = fattr, 4033 .label = label, 4034 .fh = fhandle, 4035 }; 4036 struct rpc_message msg = { 4037 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4038 .rpc_argp = &args, 4039 .rpc_resp = &res, 4040 }; 4041 4042 args.bitmask = nfs4_bitmask(server, label); 4043 4044 nfs_fattr_init(fattr); 4045 4046 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4047 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4048 &res.seq_res, 0); 4049 dprintk("NFS reply lookupp: %d\n", status); 4050 return status; 4051 } 4052 4053 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4054 struct nfs_fattr *fattr, struct nfs4_label *label) 4055 { 4056 struct nfs4_exception exception = { }; 4057 int err; 4058 do { 4059 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label); 4060 trace_nfs4_lookupp(inode, err); 4061 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4062 &exception); 4063 } while (exception.retry); 4064 return err; 4065 } 4066 4067 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4068 { 4069 struct nfs_server *server = NFS_SERVER(inode); 4070 struct nfs4_accessargs args = { 4071 .fh = NFS_FH(inode), 4072 .access = entry->mask, 4073 }; 4074 struct nfs4_accessres res = { 4075 .server = server, 4076 }; 4077 struct rpc_message msg = { 4078 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4079 .rpc_argp = &args, 4080 .rpc_resp = &res, 4081 .rpc_cred = entry->cred, 4082 }; 4083 int status = 0; 4084 4085 if (!nfs_have_delegated_attributes(inode)) { 4086 res.fattr = nfs_alloc_fattr(); 4087 if (res.fattr == NULL) 4088 return -ENOMEM; 4089 args.bitmask = server->cache_consistency_bitmask; 4090 } 4091 4092 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4093 if (!status) { 4094 nfs_access_set_mask(entry, res.access); 4095 if (res.fattr) 4096 nfs_refresh_inode(inode, res.fattr); 4097 } 4098 nfs_free_fattr(res.fattr); 4099 return status; 4100 } 4101 4102 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4103 { 4104 struct nfs4_exception exception = { }; 4105 int err; 4106 do { 4107 err = _nfs4_proc_access(inode, entry); 4108 trace_nfs4_access(inode, err); 4109 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4110 &exception); 4111 } while (exception.retry); 4112 return err; 4113 } 4114 4115 /* 4116 * TODO: For the time being, we don't try to get any attributes 4117 * along with any of the zero-copy operations READ, READDIR, 4118 * READLINK, WRITE. 4119 * 4120 * In the case of the first three, we want to put the GETATTR 4121 * after the read-type operation -- this is because it is hard 4122 * to predict the length of a GETATTR response in v4, and thus 4123 * align the READ data correctly. This means that the GETATTR 4124 * may end up partially falling into the page cache, and we should 4125 * shift it into the 'tail' of the xdr_buf before processing. 4126 * To do this efficiently, we need to know the total length 4127 * of data received, which doesn't seem to be available outside 4128 * of the RPC layer. 4129 * 4130 * In the case of WRITE, we also want to put the GETATTR after 4131 * the operation -- in this case because we want to make sure 4132 * we get the post-operation mtime and size. 4133 * 4134 * Both of these changes to the XDR layer would in fact be quite 4135 * minor, but I decided to leave them for a subsequent patch. 4136 */ 4137 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4138 unsigned int pgbase, unsigned int pglen) 4139 { 4140 struct nfs4_readlink args = { 4141 .fh = NFS_FH(inode), 4142 .pgbase = pgbase, 4143 .pglen = pglen, 4144 .pages = &page, 4145 }; 4146 struct nfs4_readlink_res res; 4147 struct rpc_message msg = { 4148 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4149 .rpc_argp = &args, 4150 .rpc_resp = &res, 4151 }; 4152 4153 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4154 } 4155 4156 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4157 unsigned int pgbase, unsigned int pglen) 4158 { 4159 struct nfs4_exception exception = { }; 4160 int err; 4161 do { 4162 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4163 trace_nfs4_readlink(inode, err); 4164 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4165 &exception); 4166 } while (exception.retry); 4167 return err; 4168 } 4169 4170 /* 4171 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4172 */ 4173 static int 4174 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4175 int flags) 4176 { 4177 struct nfs_server *server = NFS_SERVER(dir); 4178 struct nfs4_label l, *ilabel = NULL; 4179 struct nfs_open_context *ctx; 4180 struct nfs4_state *state; 4181 int status = 0; 4182 4183 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4184 if (IS_ERR(ctx)) 4185 return PTR_ERR(ctx); 4186 4187 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4188 4189 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4190 sattr->ia_mode &= ~current_umask(); 4191 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4192 if (IS_ERR(state)) { 4193 status = PTR_ERR(state); 4194 goto out; 4195 } 4196 out: 4197 nfs4_label_release_security(ilabel); 4198 put_nfs_open_context(ctx); 4199 return status; 4200 } 4201 4202 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) 4203 { 4204 struct nfs_server *server = NFS_SERVER(dir); 4205 struct nfs_removeargs args = { 4206 .fh = NFS_FH(dir), 4207 .name = *name, 4208 }; 4209 struct nfs_removeres res = { 4210 .server = server, 4211 }; 4212 struct rpc_message msg = { 4213 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4214 .rpc_argp = &args, 4215 .rpc_resp = &res, 4216 }; 4217 unsigned long timestamp = jiffies; 4218 int status; 4219 4220 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4221 if (status == 0) 4222 update_changeattr(dir, &res.cinfo, timestamp); 4223 return status; 4224 } 4225 4226 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4227 { 4228 struct nfs4_exception exception = { }; 4229 struct inode *inode = d_inode(dentry); 4230 int err; 4231 4232 if (inode) { 4233 if (inode->i_nlink == 1) 4234 nfs4_inode_return_delegation(inode); 4235 else 4236 nfs4_inode_make_writeable(inode); 4237 } 4238 do { 4239 err = _nfs4_proc_remove(dir, &dentry->d_name); 4240 trace_nfs4_remove(dir, &dentry->d_name, err); 4241 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4242 &exception); 4243 } while (exception.retry); 4244 return err; 4245 } 4246 4247 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4248 { 4249 struct nfs4_exception exception = { }; 4250 int err; 4251 4252 do { 4253 err = _nfs4_proc_remove(dir, name); 4254 trace_nfs4_remove(dir, name, err); 4255 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4256 &exception); 4257 } while (exception.retry); 4258 return err; 4259 } 4260 4261 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dentry) 4262 { 4263 struct nfs_removeargs *args = msg->rpc_argp; 4264 struct nfs_removeres *res = msg->rpc_resp; 4265 struct inode *inode = d_inode(dentry); 4266 4267 res->server = NFS_SB(dentry->d_sb); 4268 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4269 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4270 4271 nfs_fattr_init(res->dir_attr); 4272 4273 if (inode) 4274 nfs4_inode_return_delegation(inode); 4275 } 4276 4277 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4278 { 4279 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4280 &data->args.seq_args, 4281 &data->res.seq_res, 4282 task); 4283 } 4284 4285 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4286 { 4287 struct nfs_unlinkdata *data = task->tk_calldata; 4288 struct nfs_removeres *res = &data->res; 4289 4290 if (!nfs4_sequence_done(task, &res->seq_res)) 4291 return 0; 4292 if (nfs4_async_handle_error(task, res->server, NULL, 4293 &data->timeout) == -EAGAIN) 4294 return 0; 4295 if (task->tk_status == 0) 4296 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start); 4297 return 1; 4298 } 4299 4300 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4301 struct dentry *old_dentry, 4302 struct dentry *new_dentry) 4303 { 4304 struct nfs_renameargs *arg = msg->rpc_argp; 4305 struct nfs_renameres *res = msg->rpc_resp; 4306 struct inode *old_inode = d_inode(old_dentry); 4307 struct inode *new_inode = d_inode(new_dentry); 4308 4309 if (old_inode) 4310 nfs4_inode_make_writeable(old_inode); 4311 if (new_inode) 4312 nfs4_inode_return_delegation(new_inode); 4313 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4314 res->server = NFS_SB(old_dentry->d_sb); 4315 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4316 } 4317 4318 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4319 { 4320 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4321 &data->args.seq_args, 4322 &data->res.seq_res, 4323 task); 4324 } 4325 4326 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4327 struct inode *new_dir) 4328 { 4329 struct nfs_renamedata *data = task->tk_calldata; 4330 struct nfs_renameres *res = &data->res; 4331 4332 if (!nfs4_sequence_done(task, &res->seq_res)) 4333 return 0; 4334 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4335 return 0; 4336 4337 if (task->tk_status == 0) { 4338 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start); 4339 if (new_dir != old_dir) 4340 update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start); 4341 } 4342 return 1; 4343 } 4344 4345 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4346 { 4347 struct nfs_server *server = NFS_SERVER(inode); 4348 struct nfs4_link_arg arg = { 4349 .fh = NFS_FH(inode), 4350 .dir_fh = NFS_FH(dir), 4351 .name = name, 4352 .bitmask = server->attr_bitmask, 4353 }; 4354 struct nfs4_link_res res = { 4355 .server = server, 4356 .label = NULL, 4357 }; 4358 struct rpc_message msg = { 4359 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4360 .rpc_argp = &arg, 4361 .rpc_resp = &res, 4362 }; 4363 int status = -ENOMEM; 4364 4365 res.fattr = nfs_alloc_fattr(); 4366 if (res.fattr == NULL) 4367 goto out; 4368 4369 res.label = nfs4_label_alloc(server, GFP_KERNEL); 4370 if (IS_ERR(res.label)) { 4371 status = PTR_ERR(res.label); 4372 goto out; 4373 } 4374 arg.bitmask = nfs4_bitmask(server, res.label); 4375 4376 nfs4_inode_make_writeable(inode); 4377 4378 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4379 if (!status) { 4380 update_changeattr(dir, &res.cinfo, res.fattr->time_start); 4381 status = nfs_post_op_update_inode(inode, res.fattr); 4382 if (!status) 4383 nfs_setsecurity(inode, res.fattr, res.label); 4384 } 4385 4386 4387 nfs4_label_free(res.label); 4388 4389 out: 4390 nfs_free_fattr(res.fattr); 4391 return status; 4392 } 4393 4394 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4395 { 4396 struct nfs4_exception exception = { }; 4397 int err; 4398 do { 4399 err = nfs4_handle_exception(NFS_SERVER(inode), 4400 _nfs4_proc_link(inode, dir, name), 4401 &exception); 4402 } while (exception.retry); 4403 return err; 4404 } 4405 4406 struct nfs4_createdata { 4407 struct rpc_message msg; 4408 struct nfs4_create_arg arg; 4409 struct nfs4_create_res res; 4410 struct nfs_fh fh; 4411 struct nfs_fattr fattr; 4412 struct nfs4_label *label; 4413 }; 4414 4415 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4416 const struct qstr *name, struct iattr *sattr, u32 ftype) 4417 { 4418 struct nfs4_createdata *data; 4419 4420 data = kzalloc(sizeof(*data), GFP_KERNEL); 4421 if (data != NULL) { 4422 struct nfs_server *server = NFS_SERVER(dir); 4423 4424 data->label = nfs4_label_alloc(server, GFP_KERNEL); 4425 if (IS_ERR(data->label)) 4426 goto out_free; 4427 4428 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4429 data->msg.rpc_argp = &data->arg; 4430 data->msg.rpc_resp = &data->res; 4431 data->arg.dir_fh = NFS_FH(dir); 4432 data->arg.server = server; 4433 data->arg.name = name; 4434 data->arg.attrs = sattr; 4435 data->arg.ftype = ftype; 4436 data->arg.bitmask = nfs4_bitmask(server, data->label); 4437 data->arg.umask = current_umask(); 4438 data->res.server = server; 4439 data->res.fh = &data->fh; 4440 data->res.fattr = &data->fattr; 4441 data->res.label = data->label; 4442 nfs_fattr_init(data->res.fattr); 4443 } 4444 return data; 4445 out_free: 4446 kfree(data); 4447 return NULL; 4448 } 4449 4450 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4451 { 4452 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4453 &data->arg.seq_args, &data->res.seq_res, 1); 4454 if (status == 0) { 4455 update_changeattr(dir, &data->res.dir_cinfo, 4456 data->res.fattr->time_start); 4457 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 4458 } 4459 return status; 4460 } 4461 4462 static void nfs4_free_createdata(struct nfs4_createdata *data) 4463 { 4464 nfs4_label_free(data->label); 4465 kfree(data); 4466 } 4467 4468 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4469 struct page *page, unsigned int len, struct iattr *sattr, 4470 struct nfs4_label *label) 4471 { 4472 struct nfs4_createdata *data; 4473 int status = -ENAMETOOLONG; 4474 4475 if (len > NFS4_MAXPATHLEN) 4476 goto out; 4477 4478 status = -ENOMEM; 4479 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 4480 if (data == NULL) 4481 goto out; 4482 4483 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 4484 data->arg.u.symlink.pages = &page; 4485 data->arg.u.symlink.len = len; 4486 data->arg.label = label; 4487 4488 status = nfs4_do_create(dir, dentry, data); 4489 4490 nfs4_free_createdata(data); 4491 out: 4492 return status; 4493 } 4494 4495 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4496 struct page *page, unsigned int len, struct iattr *sattr) 4497 { 4498 struct nfs4_exception exception = { }; 4499 struct nfs4_label l, *label = NULL; 4500 int err; 4501 4502 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4503 4504 do { 4505 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4506 trace_nfs4_symlink(dir, &dentry->d_name, err); 4507 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4508 &exception); 4509 } while (exception.retry); 4510 4511 nfs4_label_release_security(label); 4512 return err; 4513 } 4514 4515 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4516 struct iattr *sattr, struct nfs4_label *label) 4517 { 4518 struct nfs4_createdata *data; 4519 int status = -ENOMEM; 4520 4521 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4522 if (data == NULL) 4523 goto out; 4524 4525 data->arg.label = label; 4526 status = nfs4_do_create(dir, dentry, data); 4527 4528 nfs4_free_createdata(data); 4529 out: 4530 return status; 4531 } 4532 4533 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4534 struct iattr *sattr) 4535 { 4536 struct nfs_server *server = NFS_SERVER(dir); 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 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4544 sattr->ia_mode &= ~current_umask(); 4545 do { 4546 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4547 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4548 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4549 &exception); 4550 } while (exception.retry); 4551 nfs4_label_release_security(label); 4552 4553 return err; 4554 } 4555 4556 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4557 u64 cookie, struct page **pages, unsigned int count, bool plus) 4558 { 4559 struct inode *dir = d_inode(dentry); 4560 struct nfs4_readdir_arg args = { 4561 .fh = NFS_FH(dir), 4562 .pages = pages, 4563 .pgbase = 0, 4564 .count = count, 4565 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4566 .plus = plus, 4567 }; 4568 struct nfs4_readdir_res res; 4569 struct rpc_message msg = { 4570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4571 .rpc_argp = &args, 4572 .rpc_resp = &res, 4573 .rpc_cred = cred, 4574 }; 4575 int status; 4576 4577 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4578 dentry, 4579 (unsigned long long)cookie); 4580 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4581 res.pgbase = args.pgbase; 4582 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4583 if (status >= 0) { 4584 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4585 status += args.pgbase; 4586 } 4587 4588 nfs_invalidate_atime(dir); 4589 4590 dprintk("%s: returns %d\n", __func__, status); 4591 return status; 4592 } 4593 4594 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4595 u64 cookie, struct page **pages, unsigned int count, bool plus) 4596 { 4597 struct nfs4_exception exception = { }; 4598 int err; 4599 do { 4600 err = _nfs4_proc_readdir(dentry, cred, cookie, 4601 pages, count, plus); 4602 trace_nfs4_readdir(d_inode(dentry), err); 4603 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4604 &exception); 4605 } while (exception.retry); 4606 return err; 4607 } 4608 4609 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4610 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4611 { 4612 struct nfs4_createdata *data; 4613 int mode = sattr->ia_mode; 4614 int status = -ENOMEM; 4615 4616 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4617 if (data == NULL) 4618 goto out; 4619 4620 if (S_ISFIFO(mode)) 4621 data->arg.ftype = NF4FIFO; 4622 else if (S_ISBLK(mode)) { 4623 data->arg.ftype = NF4BLK; 4624 data->arg.u.device.specdata1 = MAJOR(rdev); 4625 data->arg.u.device.specdata2 = MINOR(rdev); 4626 } 4627 else if (S_ISCHR(mode)) { 4628 data->arg.ftype = NF4CHR; 4629 data->arg.u.device.specdata1 = MAJOR(rdev); 4630 data->arg.u.device.specdata2 = MINOR(rdev); 4631 } else if (!S_ISSOCK(mode)) { 4632 status = -EINVAL; 4633 goto out_free; 4634 } 4635 4636 data->arg.label = label; 4637 status = nfs4_do_create(dir, dentry, data); 4638 out_free: 4639 nfs4_free_createdata(data); 4640 out: 4641 return status; 4642 } 4643 4644 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4645 struct iattr *sattr, dev_t rdev) 4646 { 4647 struct nfs_server *server = NFS_SERVER(dir); 4648 struct nfs4_exception exception = { }; 4649 struct nfs4_label l, *label = NULL; 4650 int err; 4651 4652 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4653 4654 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4655 sattr->ia_mode &= ~current_umask(); 4656 do { 4657 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 4658 trace_nfs4_mknod(dir, &dentry->d_name, err); 4659 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4660 &exception); 4661 } while (exception.retry); 4662 4663 nfs4_label_release_security(label); 4664 4665 return err; 4666 } 4667 4668 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 4669 struct nfs_fsstat *fsstat) 4670 { 4671 struct nfs4_statfs_arg args = { 4672 .fh = fhandle, 4673 .bitmask = server->attr_bitmask, 4674 }; 4675 struct nfs4_statfs_res res = { 4676 .fsstat = fsstat, 4677 }; 4678 struct rpc_message msg = { 4679 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 4680 .rpc_argp = &args, 4681 .rpc_resp = &res, 4682 }; 4683 4684 nfs_fattr_init(fsstat->fattr); 4685 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4686 } 4687 4688 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 4689 { 4690 struct nfs4_exception exception = { }; 4691 int err; 4692 do { 4693 err = nfs4_handle_exception(server, 4694 _nfs4_proc_statfs(server, fhandle, fsstat), 4695 &exception); 4696 } while (exception.retry); 4697 return err; 4698 } 4699 4700 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 4701 struct nfs_fsinfo *fsinfo) 4702 { 4703 struct nfs4_fsinfo_arg args = { 4704 .fh = fhandle, 4705 .bitmask = server->attr_bitmask, 4706 }; 4707 struct nfs4_fsinfo_res res = { 4708 .fsinfo = fsinfo, 4709 }; 4710 struct rpc_message msg = { 4711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 4712 .rpc_argp = &args, 4713 .rpc_resp = &res, 4714 }; 4715 4716 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4717 } 4718 4719 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4720 { 4721 struct nfs4_exception exception = { }; 4722 unsigned long now = jiffies; 4723 int err; 4724 4725 do { 4726 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4727 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4728 if (err == 0) { 4729 nfs4_set_lease_period(server->nfs_client, 4730 fsinfo->lease_time * HZ, 4731 now); 4732 break; 4733 } 4734 err = nfs4_handle_exception(server, err, &exception); 4735 } while (exception.retry); 4736 return err; 4737 } 4738 4739 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4740 { 4741 int error; 4742 4743 nfs_fattr_init(fsinfo->fattr); 4744 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4745 if (error == 0) { 4746 /* block layout checks this! */ 4747 server->pnfs_blksize = fsinfo->blksize; 4748 set_pnfs_layoutdriver(server, fhandle, fsinfo); 4749 } 4750 4751 return error; 4752 } 4753 4754 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4755 struct nfs_pathconf *pathconf) 4756 { 4757 struct nfs4_pathconf_arg args = { 4758 .fh = fhandle, 4759 .bitmask = server->attr_bitmask, 4760 }; 4761 struct nfs4_pathconf_res res = { 4762 .pathconf = pathconf, 4763 }; 4764 struct rpc_message msg = { 4765 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4766 .rpc_argp = &args, 4767 .rpc_resp = &res, 4768 }; 4769 4770 /* None of the pathconf attributes are mandatory to implement */ 4771 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4772 memset(pathconf, 0, sizeof(*pathconf)); 4773 return 0; 4774 } 4775 4776 nfs_fattr_init(pathconf->fattr); 4777 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4778 } 4779 4780 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4781 struct nfs_pathconf *pathconf) 4782 { 4783 struct nfs4_exception exception = { }; 4784 int err; 4785 4786 do { 4787 err = nfs4_handle_exception(server, 4788 _nfs4_proc_pathconf(server, fhandle, pathconf), 4789 &exception); 4790 } while (exception.retry); 4791 return err; 4792 } 4793 4794 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4795 const struct nfs_open_context *ctx, 4796 const struct nfs_lock_context *l_ctx, 4797 fmode_t fmode) 4798 { 4799 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 4800 } 4801 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4802 4803 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4804 const struct nfs_open_context *ctx, 4805 const struct nfs_lock_context *l_ctx, 4806 fmode_t fmode) 4807 { 4808 nfs4_stateid current_stateid; 4809 4810 /* If the current stateid represents a lost lock, then exit */ 4811 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4812 return true; 4813 return nfs4_stateid_match(stateid, ¤t_stateid); 4814 } 4815 4816 static bool nfs4_error_stateid_expired(int err) 4817 { 4818 switch (err) { 4819 case -NFS4ERR_DELEG_REVOKED: 4820 case -NFS4ERR_ADMIN_REVOKED: 4821 case -NFS4ERR_BAD_STATEID: 4822 case -NFS4ERR_STALE_STATEID: 4823 case -NFS4ERR_OLD_STATEID: 4824 case -NFS4ERR_OPENMODE: 4825 case -NFS4ERR_EXPIRED: 4826 return true; 4827 } 4828 return false; 4829 } 4830 4831 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4832 { 4833 struct nfs_server *server = NFS_SERVER(hdr->inode); 4834 4835 trace_nfs4_read(hdr, task->tk_status); 4836 if (task->tk_status < 0) { 4837 struct nfs4_exception exception = { 4838 .inode = hdr->inode, 4839 .state = hdr->args.context->state, 4840 .stateid = &hdr->args.stateid, 4841 }; 4842 task->tk_status = nfs4_async_handle_exception(task, 4843 server, task->tk_status, &exception); 4844 if (exception.retry) { 4845 rpc_restart_call_prepare(task); 4846 return -EAGAIN; 4847 } 4848 } 4849 4850 if (task->tk_status > 0) 4851 renew_lease(server, hdr->timestamp); 4852 return 0; 4853 } 4854 4855 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4856 struct nfs_pgio_args *args) 4857 { 4858 4859 if (!nfs4_error_stateid_expired(task->tk_status) || 4860 nfs4_stateid_is_current(&args->stateid, 4861 args->context, 4862 args->lock_context, 4863 FMODE_READ)) 4864 return false; 4865 rpc_restart_call_prepare(task); 4866 return true; 4867 } 4868 4869 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4870 { 4871 4872 dprintk("--> %s\n", __func__); 4873 4874 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4875 return -EAGAIN; 4876 if (nfs4_read_stateid_changed(task, &hdr->args)) 4877 return -EAGAIN; 4878 if (task->tk_status > 0) 4879 nfs_invalidate_atime(hdr->inode); 4880 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4881 nfs4_read_done_cb(task, hdr); 4882 } 4883 4884 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4885 struct rpc_message *msg) 4886 { 4887 hdr->timestamp = jiffies; 4888 if (!hdr->pgio_done_cb) 4889 hdr->pgio_done_cb = nfs4_read_done_cb; 4890 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4891 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 4892 } 4893 4894 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4895 struct nfs_pgio_header *hdr) 4896 { 4897 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 4898 &hdr->args.seq_args, 4899 &hdr->res.seq_res, 4900 task)) 4901 return 0; 4902 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4903 hdr->args.lock_context, 4904 hdr->rw_mode) == -EIO) 4905 return -EIO; 4906 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4907 return -EIO; 4908 return 0; 4909 } 4910 4911 static int nfs4_write_done_cb(struct rpc_task *task, 4912 struct nfs_pgio_header *hdr) 4913 { 4914 struct inode *inode = hdr->inode; 4915 4916 trace_nfs4_write(hdr, task->tk_status); 4917 if (task->tk_status < 0) { 4918 struct nfs4_exception exception = { 4919 .inode = hdr->inode, 4920 .state = hdr->args.context->state, 4921 .stateid = &hdr->args.stateid, 4922 }; 4923 task->tk_status = nfs4_async_handle_exception(task, 4924 NFS_SERVER(inode), task->tk_status, 4925 &exception); 4926 if (exception.retry) { 4927 rpc_restart_call_prepare(task); 4928 return -EAGAIN; 4929 } 4930 } 4931 if (task->tk_status >= 0) { 4932 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4933 nfs_writeback_update_inode(hdr); 4934 } 4935 return 0; 4936 } 4937 4938 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4939 struct nfs_pgio_args *args) 4940 { 4941 4942 if (!nfs4_error_stateid_expired(task->tk_status) || 4943 nfs4_stateid_is_current(&args->stateid, 4944 args->context, 4945 args->lock_context, 4946 FMODE_WRITE)) 4947 return false; 4948 rpc_restart_call_prepare(task); 4949 return true; 4950 } 4951 4952 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4953 { 4954 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4955 return -EAGAIN; 4956 if (nfs4_write_stateid_changed(task, &hdr->args)) 4957 return -EAGAIN; 4958 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4959 nfs4_write_done_cb(task, hdr); 4960 } 4961 4962 static 4963 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4964 { 4965 /* Don't request attributes for pNFS or O_DIRECT writes */ 4966 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4967 return false; 4968 /* Otherwise, request attributes if and only if we don't hold 4969 * a delegation 4970 */ 4971 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4972 } 4973 4974 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4975 struct rpc_message *msg, 4976 struct rpc_clnt **clnt) 4977 { 4978 struct nfs_server *server = NFS_SERVER(hdr->inode); 4979 4980 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4981 hdr->args.bitmask = NULL; 4982 hdr->res.fattr = NULL; 4983 } else 4984 hdr->args.bitmask = server->cache_consistency_bitmask; 4985 4986 if (!hdr->pgio_done_cb) 4987 hdr->pgio_done_cb = nfs4_write_done_cb; 4988 hdr->res.server = server; 4989 hdr->timestamp = jiffies; 4990 4991 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4992 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1, 0); 4993 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr); 4994 } 4995 4996 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4997 { 4998 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 4999 &data->args.seq_args, 5000 &data->res.seq_res, 5001 task); 5002 } 5003 5004 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5005 { 5006 struct inode *inode = data->inode; 5007 5008 trace_nfs4_commit(data, task->tk_status); 5009 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5010 NULL, NULL) == -EAGAIN) { 5011 rpc_restart_call_prepare(task); 5012 return -EAGAIN; 5013 } 5014 return 0; 5015 } 5016 5017 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5018 { 5019 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5020 return -EAGAIN; 5021 return data->commit_done_cb(task, data); 5022 } 5023 5024 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5025 struct rpc_clnt **clnt) 5026 { 5027 struct nfs_server *server = NFS_SERVER(data->inode); 5028 5029 if (data->commit_done_cb == NULL) 5030 data->commit_done_cb = nfs4_commit_done_cb; 5031 data->res.server = server; 5032 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5033 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5034 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5035 } 5036 5037 struct nfs4_renewdata { 5038 struct nfs_client *client; 5039 unsigned long timestamp; 5040 }; 5041 5042 /* 5043 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5044 * standalone procedure for queueing an asynchronous RENEW. 5045 */ 5046 static void nfs4_renew_release(void *calldata) 5047 { 5048 struct nfs4_renewdata *data = calldata; 5049 struct nfs_client *clp = data->client; 5050 5051 if (refcount_read(&clp->cl_count) > 1) 5052 nfs4_schedule_state_renewal(clp); 5053 nfs_put_client(clp); 5054 kfree(data); 5055 } 5056 5057 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5058 { 5059 struct nfs4_renewdata *data = calldata; 5060 struct nfs_client *clp = data->client; 5061 unsigned long timestamp = data->timestamp; 5062 5063 trace_nfs4_renew_async(clp, task->tk_status); 5064 switch (task->tk_status) { 5065 case 0: 5066 break; 5067 case -NFS4ERR_LEASE_MOVED: 5068 nfs4_schedule_lease_moved_recovery(clp); 5069 break; 5070 default: 5071 /* Unless we're shutting down, schedule state recovery! */ 5072 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5073 return; 5074 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5075 nfs4_schedule_lease_recovery(clp); 5076 return; 5077 } 5078 nfs4_schedule_path_down_recovery(clp); 5079 } 5080 do_renew_lease(clp, timestamp); 5081 } 5082 5083 static const struct rpc_call_ops nfs4_renew_ops = { 5084 .rpc_call_done = nfs4_renew_done, 5085 .rpc_release = nfs4_renew_release, 5086 }; 5087 5088 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 5089 { 5090 struct rpc_message msg = { 5091 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5092 .rpc_argp = clp, 5093 .rpc_cred = cred, 5094 }; 5095 struct nfs4_renewdata *data; 5096 5097 if (renew_flags == 0) 5098 return 0; 5099 if (!refcount_inc_not_zero(&clp->cl_count)) 5100 return -EIO; 5101 data = kmalloc(sizeof(*data), GFP_NOFS); 5102 if (data == NULL) { 5103 nfs_put_client(clp); 5104 return -ENOMEM; 5105 } 5106 data->client = clp; 5107 data->timestamp = jiffies; 5108 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5109 &nfs4_renew_ops, data); 5110 } 5111 5112 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 5113 { 5114 struct rpc_message msg = { 5115 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5116 .rpc_argp = clp, 5117 .rpc_cred = cred, 5118 }; 5119 unsigned long now = jiffies; 5120 int status; 5121 5122 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5123 if (status < 0) 5124 return status; 5125 do_renew_lease(clp, now); 5126 return 0; 5127 } 5128 5129 static inline int nfs4_server_supports_acls(struct nfs_server *server) 5130 { 5131 return server->caps & NFS_CAP_ACLS; 5132 } 5133 5134 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5135 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5136 * the stack. 5137 */ 5138 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5139 5140 static int buf_to_pages_noslab(const void *buf, size_t buflen, 5141 struct page **pages) 5142 { 5143 struct page *newpage, **spages; 5144 int rc = 0; 5145 size_t len; 5146 spages = pages; 5147 5148 do { 5149 len = min_t(size_t, PAGE_SIZE, buflen); 5150 newpage = alloc_page(GFP_KERNEL); 5151 5152 if (newpage == NULL) 5153 goto unwind; 5154 memcpy(page_address(newpage), buf, len); 5155 buf += len; 5156 buflen -= len; 5157 *pages++ = newpage; 5158 rc++; 5159 } while (buflen != 0); 5160 5161 return rc; 5162 5163 unwind: 5164 for(; rc > 0; rc--) 5165 __free_page(spages[rc-1]); 5166 return -ENOMEM; 5167 } 5168 5169 struct nfs4_cached_acl { 5170 int cached; 5171 size_t len; 5172 char data[0]; 5173 }; 5174 5175 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5176 { 5177 struct nfs_inode *nfsi = NFS_I(inode); 5178 5179 spin_lock(&inode->i_lock); 5180 kfree(nfsi->nfs4_acl); 5181 nfsi->nfs4_acl = acl; 5182 spin_unlock(&inode->i_lock); 5183 } 5184 5185 static void nfs4_zap_acl_attr(struct inode *inode) 5186 { 5187 nfs4_set_cached_acl(inode, NULL); 5188 } 5189 5190 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 5191 { 5192 struct nfs_inode *nfsi = NFS_I(inode); 5193 struct nfs4_cached_acl *acl; 5194 int ret = -ENOENT; 5195 5196 spin_lock(&inode->i_lock); 5197 acl = nfsi->nfs4_acl; 5198 if (acl == NULL) 5199 goto out; 5200 if (buf == NULL) /* user is just asking for length */ 5201 goto out_len; 5202 if (acl->cached == 0) 5203 goto out; 5204 ret = -ERANGE; /* see getxattr(2) man page */ 5205 if (acl->len > buflen) 5206 goto out; 5207 memcpy(buf, acl->data, acl->len); 5208 out_len: 5209 ret = acl->len; 5210 out: 5211 spin_unlock(&inode->i_lock); 5212 return ret; 5213 } 5214 5215 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 5216 { 5217 struct nfs4_cached_acl *acl; 5218 size_t buflen = sizeof(*acl) + acl_len; 5219 5220 if (buflen <= PAGE_SIZE) { 5221 acl = kmalloc(buflen, GFP_KERNEL); 5222 if (acl == NULL) 5223 goto out; 5224 acl->cached = 1; 5225 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5226 } else { 5227 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5228 if (acl == NULL) 5229 goto out; 5230 acl->cached = 0; 5231 } 5232 acl->len = acl_len; 5233 out: 5234 nfs4_set_cached_acl(inode, acl); 5235 } 5236 5237 /* 5238 * The getxattr API returns the required buffer length when called with a 5239 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5240 * the required buf. On a NULL buf, we send a page of data to the server 5241 * guessing that the ACL request can be serviced by a page. If so, we cache 5242 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5243 * the cache. If not so, we throw away the page, and cache the required 5244 * length. The next getxattr call will then produce another round trip to 5245 * the server, this time with the input buf of the required size. 5246 */ 5247 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5248 { 5249 struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, }; 5250 struct nfs_getaclargs args = { 5251 .fh = NFS_FH(inode), 5252 .acl_pages = pages, 5253 .acl_len = buflen, 5254 }; 5255 struct nfs_getaclres res = { 5256 .acl_len = buflen, 5257 }; 5258 struct rpc_message msg = { 5259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5260 .rpc_argp = &args, 5261 .rpc_resp = &res, 5262 }; 5263 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5264 int ret = -ENOMEM, i; 5265 5266 if (npages > ARRAY_SIZE(pages)) 5267 return -ERANGE; 5268 5269 for (i = 0; i < npages; i++) { 5270 pages[i] = alloc_page(GFP_KERNEL); 5271 if (!pages[i]) 5272 goto out_free; 5273 } 5274 5275 /* for decoding across pages */ 5276 res.acl_scratch = alloc_page(GFP_KERNEL); 5277 if (!res.acl_scratch) 5278 goto out_free; 5279 5280 args.acl_len = npages * PAGE_SIZE; 5281 5282 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5283 __func__, buf, buflen, npages, args.acl_len); 5284 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5285 &msg, &args.seq_args, &res.seq_res, 0); 5286 if (ret) 5287 goto out_free; 5288 5289 /* Handle the case where the passed-in buffer is too short */ 5290 if (res.acl_flags & NFS4_ACL_TRUNC) { 5291 /* Did the user only issue a request for the acl length? */ 5292 if (buf == NULL) 5293 goto out_ok; 5294 ret = -ERANGE; 5295 goto out_free; 5296 } 5297 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 5298 if (buf) { 5299 if (res.acl_len > buflen) { 5300 ret = -ERANGE; 5301 goto out_free; 5302 } 5303 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5304 } 5305 out_ok: 5306 ret = res.acl_len; 5307 out_free: 5308 for (i = 0; i < npages; i++) 5309 if (pages[i]) 5310 __free_page(pages[i]); 5311 if (res.acl_scratch) 5312 __free_page(res.acl_scratch); 5313 return ret; 5314 } 5315 5316 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5317 { 5318 struct nfs4_exception exception = { }; 5319 ssize_t ret; 5320 do { 5321 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 5322 trace_nfs4_get_acl(inode, ret); 5323 if (ret >= 0) 5324 break; 5325 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 5326 } while (exception.retry); 5327 return ret; 5328 } 5329 5330 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 5331 { 5332 struct nfs_server *server = NFS_SERVER(inode); 5333 int ret; 5334 5335 if (!nfs4_server_supports_acls(server)) 5336 return -EOPNOTSUPP; 5337 ret = nfs_revalidate_inode(server, inode); 5338 if (ret < 0) 5339 return ret; 5340 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 5341 nfs_zap_acl_cache(inode); 5342 ret = nfs4_read_cached_acl(inode, buf, buflen); 5343 if (ret != -ENOENT) 5344 /* -ENOENT is returned if there is no ACL or if there is an ACL 5345 * but no cached acl data, just the acl length */ 5346 return ret; 5347 return nfs4_get_acl_uncached(inode, buf, buflen); 5348 } 5349 5350 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5351 { 5352 struct nfs_server *server = NFS_SERVER(inode); 5353 struct page *pages[NFS4ACL_MAXPAGES]; 5354 struct nfs_setaclargs arg = { 5355 .fh = NFS_FH(inode), 5356 .acl_pages = pages, 5357 .acl_len = buflen, 5358 }; 5359 struct nfs_setaclres res; 5360 struct rpc_message msg = { 5361 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 5362 .rpc_argp = &arg, 5363 .rpc_resp = &res, 5364 }; 5365 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 5366 int ret, i; 5367 5368 if (!nfs4_server_supports_acls(server)) 5369 return -EOPNOTSUPP; 5370 if (npages > ARRAY_SIZE(pages)) 5371 return -ERANGE; 5372 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages); 5373 if (i < 0) 5374 return i; 5375 nfs4_inode_make_writeable(inode); 5376 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5377 5378 /* 5379 * Free each page after tx, so the only ref left is 5380 * held by the network stack 5381 */ 5382 for (; i > 0; i--) 5383 put_page(pages[i-1]); 5384 5385 /* 5386 * Acl update can result in inode attribute update. 5387 * so mark the attribute cache invalid. 5388 */ 5389 spin_lock(&inode->i_lock); 5390 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 5391 | NFS_INO_INVALID_CTIME; 5392 spin_unlock(&inode->i_lock); 5393 nfs_access_zap_cache(inode); 5394 nfs_zap_acl_cache(inode); 5395 return ret; 5396 } 5397 5398 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5399 { 5400 struct nfs4_exception exception = { }; 5401 int err; 5402 do { 5403 err = __nfs4_proc_set_acl(inode, buf, buflen); 5404 trace_nfs4_set_acl(inode, err); 5405 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5406 &exception); 5407 } while (exception.retry); 5408 return err; 5409 } 5410 5411 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5412 static int _nfs4_get_security_label(struct inode *inode, void *buf, 5413 size_t buflen) 5414 { 5415 struct nfs_server *server = NFS_SERVER(inode); 5416 struct nfs_fattr fattr; 5417 struct nfs4_label label = {0, 0, buflen, buf}; 5418 5419 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5420 struct nfs4_getattr_arg arg = { 5421 .fh = NFS_FH(inode), 5422 .bitmask = bitmask, 5423 }; 5424 struct nfs4_getattr_res res = { 5425 .fattr = &fattr, 5426 .label = &label, 5427 .server = server, 5428 }; 5429 struct rpc_message msg = { 5430 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 5431 .rpc_argp = &arg, 5432 .rpc_resp = &res, 5433 }; 5434 int ret; 5435 5436 nfs_fattr_init(&fattr); 5437 5438 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 5439 if (ret) 5440 return ret; 5441 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 5442 return -ENOENT; 5443 if (buflen < label.len) 5444 return -ERANGE; 5445 return 0; 5446 } 5447 5448 static int nfs4_get_security_label(struct inode *inode, void *buf, 5449 size_t buflen) 5450 { 5451 struct nfs4_exception exception = { }; 5452 int err; 5453 5454 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5455 return -EOPNOTSUPP; 5456 5457 do { 5458 err = _nfs4_get_security_label(inode, buf, buflen); 5459 trace_nfs4_get_security_label(inode, err); 5460 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5461 &exception); 5462 } while (exception.retry); 5463 return err; 5464 } 5465 5466 static int _nfs4_do_set_security_label(struct inode *inode, 5467 struct nfs4_label *ilabel, 5468 struct nfs_fattr *fattr, 5469 struct nfs4_label *olabel) 5470 { 5471 5472 struct iattr sattr = {0}; 5473 struct nfs_server *server = NFS_SERVER(inode); 5474 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5475 struct nfs_setattrargs arg = { 5476 .fh = NFS_FH(inode), 5477 .iap = &sattr, 5478 .server = server, 5479 .bitmask = bitmask, 5480 .label = ilabel, 5481 }; 5482 struct nfs_setattrres res = { 5483 .fattr = fattr, 5484 .label = olabel, 5485 .server = server, 5486 }; 5487 struct rpc_message msg = { 5488 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 5489 .rpc_argp = &arg, 5490 .rpc_resp = &res, 5491 }; 5492 int status; 5493 5494 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 5495 5496 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5497 if (status) 5498 dprintk("%s failed: %d\n", __func__, status); 5499 5500 return status; 5501 } 5502 5503 static int nfs4_do_set_security_label(struct inode *inode, 5504 struct nfs4_label *ilabel, 5505 struct nfs_fattr *fattr, 5506 struct nfs4_label *olabel) 5507 { 5508 struct nfs4_exception exception = { }; 5509 int err; 5510 5511 do { 5512 err = _nfs4_do_set_security_label(inode, ilabel, 5513 fattr, olabel); 5514 trace_nfs4_set_security_label(inode, err); 5515 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5516 &exception); 5517 } while (exception.retry); 5518 return err; 5519 } 5520 5521 static int 5522 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 5523 { 5524 struct nfs4_label ilabel, *olabel = NULL; 5525 struct nfs_fattr fattr; 5526 struct rpc_cred *cred; 5527 int status; 5528 5529 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5530 return -EOPNOTSUPP; 5531 5532 nfs_fattr_init(&fattr); 5533 5534 ilabel.pi = 0; 5535 ilabel.lfs = 0; 5536 ilabel.label = (char *)buf; 5537 ilabel.len = buflen; 5538 5539 cred = rpc_lookup_cred(); 5540 if (IS_ERR(cred)) 5541 return PTR_ERR(cred); 5542 5543 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5544 if (IS_ERR(olabel)) { 5545 status = -PTR_ERR(olabel); 5546 goto out; 5547 } 5548 5549 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5550 if (status == 0) 5551 nfs_setsecurity(inode, &fattr, olabel); 5552 5553 nfs4_label_free(olabel); 5554 out: 5555 put_rpccred(cred); 5556 return status; 5557 } 5558 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5559 5560 5561 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5562 nfs4_verifier *bootverf) 5563 { 5564 __be32 verf[2]; 5565 5566 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5567 /* An impossible timestamp guarantees this value 5568 * will never match a generated boot time. */ 5569 verf[0] = cpu_to_be32(U32_MAX); 5570 verf[1] = cpu_to_be32(U32_MAX); 5571 } else { 5572 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5573 u64 ns = ktime_to_ns(nn->boot_time); 5574 5575 verf[0] = cpu_to_be32(ns >> 32); 5576 verf[1] = cpu_to_be32(ns); 5577 } 5578 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 5579 } 5580 5581 static int 5582 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 5583 { 5584 size_t len; 5585 char *str; 5586 5587 if (clp->cl_owner_id != NULL) 5588 return 0; 5589 5590 rcu_read_lock(); 5591 len = 14 + strlen(clp->cl_ipaddr) + 1 + 5592 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 5593 1 + 5594 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) + 5595 1; 5596 rcu_read_unlock(); 5597 5598 if (len > NFS4_OPAQUE_LIMIT + 1) 5599 return -EINVAL; 5600 5601 /* 5602 * Since this string is allocated at mount time, and held until the 5603 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5604 * about a memory-reclaim deadlock. 5605 */ 5606 str = kmalloc(len, GFP_KERNEL); 5607 if (!str) 5608 return -ENOMEM; 5609 5610 rcu_read_lock(); 5611 scnprintf(str, len, "Linux NFSv4.0 %s/%s %s", 5612 clp->cl_ipaddr, 5613 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), 5614 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)); 5615 rcu_read_unlock(); 5616 5617 clp->cl_owner_id = str; 5618 return 0; 5619 } 5620 5621 static int 5622 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 5623 { 5624 size_t len; 5625 char *str; 5626 5627 len = 10 + 10 + 1 + 10 + 1 + 5628 strlen(nfs4_client_id_uniquifier) + 1 + 5629 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5630 5631 if (len > NFS4_OPAQUE_LIMIT + 1) 5632 return -EINVAL; 5633 5634 /* 5635 * Since this string is allocated at mount time, and held until the 5636 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5637 * about a memory-reclaim deadlock. 5638 */ 5639 str = kmalloc(len, GFP_KERNEL); 5640 if (!str) 5641 return -ENOMEM; 5642 5643 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 5644 clp->rpc_ops->version, clp->cl_minorversion, 5645 nfs4_client_id_uniquifier, 5646 clp->cl_rpcclient->cl_nodename); 5647 clp->cl_owner_id = str; 5648 return 0; 5649 } 5650 5651 static int 5652 nfs4_init_uniform_client_string(struct nfs_client *clp) 5653 { 5654 size_t len; 5655 char *str; 5656 5657 if (clp->cl_owner_id != NULL) 5658 return 0; 5659 5660 if (nfs4_client_id_uniquifier[0] != '\0') 5661 return nfs4_init_uniquifier_client_string(clp); 5662 5663 len = 10 + 10 + 1 + 10 + 1 + 5664 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5665 5666 if (len > NFS4_OPAQUE_LIMIT + 1) 5667 return -EINVAL; 5668 5669 /* 5670 * Since this string is allocated at mount time, and held until the 5671 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5672 * about a memory-reclaim deadlock. 5673 */ 5674 str = kmalloc(len, GFP_KERNEL); 5675 if (!str) 5676 return -ENOMEM; 5677 5678 scnprintf(str, len, "Linux NFSv%u.%u %s", 5679 clp->rpc_ops->version, clp->cl_minorversion, 5680 clp->cl_rpcclient->cl_nodename); 5681 clp->cl_owner_id = str; 5682 return 0; 5683 } 5684 5685 /* 5686 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 5687 * services. Advertise one based on the address family of the 5688 * clientaddr. 5689 */ 5690 static unsigned int 5691 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 5692 { 5693 if (strchr(clp->cl_ipaddr, ':') != NULL) 5694 return scnprintf(buf, len, "tcp6"); 5695 else 5696 return scnprintf(buf, len, "tcp"); 5697 } 5698 5699 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 5700 { 5701 struct nfs4_setclientid *sc = calldata; 5702 5703 if (task->tk_status == 0) 5704 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 5705 } 5706 5707 static const struct rpc_call_ops nfs4_setclientid_ops = { 5708 .rpc_call_done = nfs4_setclientid_done, 5709 }; 5710 5711 /** 5712 * nfs4_proc_setclientid - Negotiate client ID 5713 * @clp: state data structure 5714 * @program: RPC program for NFSv4 callback service 5715 * @port: IP port number for NFS4 callback service 5716 * @cred: RPC credential to use for this call 5717 * @res: where to place the result 5718 * 5719 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5720 */ 5721 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 5722 unsigned short port, struct rpc_cred *cred, 5723 struct nfs4_setclientid_res *res) 5724 { 5725 nfs4_verifier sc_verifier; 5726 struct nfs4_setclientid setclientid = { 5727 .sc_verifier = &sc_verifier, 5728 .sc_prog = program, 5729 .sc_clnt = clp, 5730 }; 5731 struct rpc_message msg = { 5732 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5733 .rpc_argp = &setclientid, 5734 .rpc_resp = res, 5735 .rpc_cred = cred, 5736 }; 5737 struct rpc_task *task; 5738 struct rpc_task_setup task_setup_data = { 5739 .rpc_client = clp->cl_rpcclient, 5740 .rpc_message = &msg, 5741 .callback_ops = &nfs4_setclientid_ops, 5742 .callback_data = &setclientid, 5743 .flags = RPC_TASK_TIMEOUT, 5744 }; 5745 int status; 5746 5747 /* nfs_client_id4 */ 5748 nfs4_init_boot_verifier(clp, &sc_verifier); 5749 5750 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5751 status = nfs4_init_uniform_client_string(clp); 5752 else 5753 status = nfs4_init_nonuniform_client_string(clp); 5754 5755 if (status) 5756 goto out; 5757 5758 /* cb_client4 */ 5759 setclientid.sc_netid_len = 5760 nfs4_init_callback_netid(clp, 5761 setclientid.sc_netid, 5762 sizeof(setclientid.sc_netid)); 5763 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5764 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5765 clp->cl_ipaddr, port >> 8, port & 255); 5766 5767 dprintk("NFS call setclientid auth=%s, '%s'\n", 5768 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5769 clp->cl_owner_id); 5770 task = rpc_run_task(&task_setup_data); 5771 if (IS_ERR(task)) { 5772 status = PTR_ERR(task); 5773 goto out; 5774 } 5775 status = task->tk_status; 5776 if (setclientid.sc_cred) { 5777 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5778 put_rpccred(setclientid.sc_cred); 5779 } 5780 rpc_put_task(task); 5781 out: 5782 trace_nfs4_setclientid(clp, status); 5783 dprintk("NFS reply setclientid: %d\n", status); 5784 return status; 5785 } 5786 5787 /** 5788 * nfs4_proc_setclientid_confirm - Confirm client ID 5789 * @clp: state data structure 5790 * @res: result of a previous SETCLIENTID 5791 * @cred: RPC credential to use for this call 5792 * 5793 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5794 */ 5795 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5796 struct nfs4_setclientid_res *arg, 5797 struct rpc_cred *cred) 5798 { 5799 struct rpc_message msg = { 5800 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5801 .rpc_argp = arg, 5802 .rpc_cred = cred, 5803 }; 5804 int status; 5805 5806 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5807 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5808 clp->cl_clientid); 5809 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5810 trace_nfs4_setclientid_confirm(clp, status); 5811 dprintk("NFS reply setclientid_confirm: %d\n", status); 5812 return status; 5813 } 5814 5815 struct nfs4_delegreturndata { 5816 struct nfs4_delegreturnargs args; 5817 struct nfs4_delegreturnres res; 5818 struct nfs_fh fh; 5819 nfs4_stateid stateid; 5820 unsigned long timestamp; 5821 struct { 5822 struct nfs4_layoutreturn_args arg; 5823 struct nfs4_layoutreturn_res res; 5824 struct nfs4_xdr_opaque_data ld_private; 5825 u32 roc_barrier; 5826 bool roc; 5827 } lr; 5828 struct nfs_fattr fattr; 5829 int rpc_status; 5830 struct inode *inode; 5831 }; 5832 5833 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5834 { 5835 struct nfs4_delegreturndata *data = calldata; 5836 struct nfs4_exception exception = { 5837 .inode = data->inode, 5838 .stateid = &data->stateid, 5839 }; 5840 5841 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5842 return; 5843 5844 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5845 5846 /* Handle Layoutreturn errors */ 5847 if (data->args.lr_args && task->tk_status != 0) { 5848 switch(data->res.lr_ret) { 5849 default: 5850 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5851 break; 5852 case 0: 5853 data->args.lr_args = NULL; 5854 data->res.lr_res = NULL; 5855 break; 5856 case -NFS4ERR_OLD_STATEID: 5857 if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid, 5858 data->inode)) 5859 goto lr_restart; 5860 /* Fallthrough */ 5861 case -NFS4ERR_ADMIN_REVOKED: 5862 case -NFS4ERR_DELEG_REVOKED: 5863 case -NFS4ERR_EXPIRED: 5864 case -NFS4ERR_BAD_STATEID: 5865 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 5866 case -NFS4ERR_WRONG_CRED: 5867 data->args.lr_args = NULL; 5868 data->res.lr_res = NULL; 5869 goto lr_restart; 5870 } 5871 } 5872 5873 switch (task->tk_status) { 5874 case 0: 5875 renew_lease(data->res.server, data->timestamp); 5876 break; 5877 case -NFS4ERR_ADMIN_REVOKED: 5878 case -NFS4ERR_DELEG_REVOKED: 5879 case -NFS4ERR_EXPIRED: 5880 nfs4_free_revoked_stateid(data->res.server, 5881 data->args.stateid, 5882 task->tk_msg.rpc_cred); 5883 /* Fallthrough */ 5884 case -NFS4ERR_BAD_STATEID: 5885 case -NFS4ERR_STALE_STATEID: 5886 task->tk_status = 0; 5887 break; 5888 case -NFS4ERR_OLD_STATEID: 5889 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 5890 goto out_restart; 5891 task->tk_status = 0; 5892 break; 5893 case -NFS4ERR_ACCESS: 5894 if (data->args.bitmask) { 5895 data->args.bitmask = NULL; 5896 data->res.fattr = NULL; 5897 goto out_restart; 5898 } 5899 /* Fallthrough */ 5900 default: 5901 task->tk_status = nfs4_async_handle_exception(task, 5902 data->res.server, task->tk_status, 5903 &exception); 5904 if (exception.retry) 5905 goto out_restart; 5906 } 5907 data->rpc_status = task->tk_status; 5908 return; 5909 lr_restart: 5910 data->res.lr_ret = 0; 5911 out_restart: 5912 task->tk_status = 0; 5913 rpc_restart_call_prepare(task); 5914 } 5915 5916 static void nfs4_delegreturn_release(void *calldata) 5917 { 5918 struct nfs4_delegreturndata *data = calldata; 5919 struct inode *inode = data->inode; 5920 5921 if (inode) { 5922 if (data->lr.roc) 5923 pnfs_roc_release(&data->lr.arg, &data->lr.res, 5924 data->res.lr_ret); 5925 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5926 nfs_iput_and_deactive(inode); 5927 } 5928 kfree(calldata); 5929 } 5930 5931 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5932 { 5933 struct nfs4_delegreturndata *d_data; 5934 5935 d_data = (struct nfs4_delegreturndata *)data; 5936 5937 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) 5938 return; 5939 5940 nfs4_setup_sequence(d_data->res.server->nfs_client, 5941 &d_data->args.seq_args, 5942 &d_data->res.seq_res, 5943 task); 5944 } 5945 5946 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5947 .rpc_call_prepare = nfs4_delegreturn_prepare, 5948 .rpc_call_done = nfs4_delegreturn_done, 5949 .rpc_release = nfs4_delegreturn_release, 5950 }; 5951 5952 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5953 { 5954 struct nfs4_delegreturndata *data; 5955 struct nfs_server *server = NFS_SERVER(inode); 5956 struct rpc_task *task; 5957 struct rpc_message msg = { 5958 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5959 .rpc_cred = cred, 5960 }; 5961 struct rpc_task_setup task_setup_data = { 5962 .rpc_client = server->client, 5963 .rpc_message = &msg, 5964 .callback_ops = &nfs4_delegreturn_ops, 5965 .flags = RPC_TASK_ASYNC, 5966 }; 5967 int status = 0; 5968 5969 data = kzalloc(sizeof(*data), GFP_NOFS); 5970 if (data == NULL) 5971 return -ENOMEM; 5972 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5973 5974 nfs4_state_protect(server->nfs_client, 5975 NFS_SP4_MACH_CRED_CLEANUP, 5976 &task_setup_data.rpc_client, &msg); 5977 5978 data->args.fhandle = &data->fh; 5979 data->args.stateid = &data->stateid; 5980 data->args.bitmask = server->cache_consistency_bitmask; 5981 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5982 nfs4_stateid_copy(&data->stateid, stateid); 5983 data->res.fattr = &data->fattr; 5984 data->res.server = server; 5985 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5986 data->lr.arg.ld_private = &data->lr.ld_private; 5987 nfs_fattr_init(data->res.fattr); 5988 data->timestamp = jiffies; 5989 data->rpc_status = 0; 5990 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred); 5991 data->inode = nfs_igrab_and_active(inode); 5992 if (data->inode) { 5993 if (data->lr.roc) { 5994 data->args.lr_args = &data->lr.arg; 5995 data->res.lr_res = &data->lr.res; 5996 } 5997 } else if (data->lr.roc) { 5998 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0); 5999 data->lr.roc = false; 6000 } 6001 6002 task_setup_data.callback_data = data; 6003 msg.rpc_argp = &data->args; 6004 msg.rpc_resp = &data->res; 6005 task = rpc_run_task(&task_setup_data); 6006 if (IS_ERR(task)) 6007 return PTR_ERR(task); 6008 if (!issync) 6009 goto out; 6010 status = rpc_wait_for_completion_task(task); 6011 if (status != 0) 6012 goto out; 6013 status = data->rpc_status; 6014 out: 6015 rpc_put_task(task); 6016 return status; 6017 } 6018 6019 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 6020 { 6021 struct nfs_server *server = NFS_SERVER(inode); 6022 struct nfs4_exception exception = { }; 6023 int err; 6024 do { 6025 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6026 trace_nfs4_delegreturn(inode, stateid, err); 6027 switch (err) { 6028 case -NFS4ERR_STALE_STATEID: 6029 case -NFS4ERR_EXPIRED: 6030 case 0: 6031 return 0; 6032 } 6033 err = nfs4_handle_exception(server, err, &exception); 6034 } while (exception.retry); 6035 return err; 6036 } 6037 6038 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6039 { 6040 struct inode *inode = state->inode; 6041 struct nfs_server *server = NFS_SERVER(inode); 6042 struct nfs_client *clp = server->nfs_client; 6043 struct nfs_lockt_args arg = { 6044 .fh = NFS_FH(inode), 6045 .fl = request, 6046 }; 6047 struct nfs_lockt_res res = { 6048 .denied = request, 6049 }; 6050 struct rpc_message msg = { 6051 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6052 .rpc_argp = &arg, 6053 .rpc_resp = &res, 6054 .rpc_cred = state->owner->so_cred, 6055 }; 6056 struct nfs4_lock_state *lsp; 6057 int status; 6058 6059 arg.lock_owner.clientid = clp->cl_clientid; 6060 status = nfs4_set_lock_state(state, request); 6061 if (status != 0) 6062 goto out; 6063 lsp = request->fl_u.nfs4_fl.owner; 6064 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6065 arg.lock_owner.s_dev = server->s_dev; 6066 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6067 switch (status) { 6068 case 0: 6069 request->fl_type = F_UNLCK; 6070 break; 6071 case -NFS4ERR_DENIED: 6072 status = 0; 6073 } 6074 request->fl_ops->fl_release_private(request); 6075 request->fl_ops = NULL; 6076 out: 6077 return status; 6078 } 6079 6080 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6081 { 6082 struct nfs4_exception exception = { }; 6083 int err; 6084 6085 do { 6086 err = _nfs4_proc_getlk(state, cmd, request); 6087 trace_nfs4_get_lock(request, state, cmd, err); 6088 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6089 &exception); 6090 } while (exception.retry); 6091 return err; 6092 } 6093 6094 struct nfs4_unlockdata { 6095 struct nfs_locku_args arg; 6096 struct nfs_locku_res res; 6097 struct nfs4_lock_state *lsp; 6098 struct nfs_open_context *ctx; 6099 struct nfs_lock_context *l_ctx; 6100 struct file_lock fl; 6101 struct nfs_server *server; 6102 unsigned long timestamp; 6103 }; 6104 6105 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6106 struct nfs_open_context *ctx, 6107 struct nfs4_lock_state *lsp, 6108 struct nfs_seqid *seqid) 6109 { 6110 struct nfs4_unlockdata *p; 6111 struct inode *inode = lsp->ls_state->inode; 6112 6113 p = kzalloc(sizeof(*p), GFP_NOFS); 6114 if (p == NULL) 6115 return NULL; 6116 p->arg.fh = NFS_FH(inode); 6117 p->arg.fl = &p->fl; 6118 p->arg.seqid = seqid; 6119 p->res.seqid = seqid; 6120 p->lsp = lsp; 6121 refcount_inc(&lsp->ls_count); 6122 /* Ensure we don't close file until we're done freeing locks! */ 6123 p->ctx = get_nfs_open_context(ctx); 6124 p->l_ctx = nfs_get_lock_context(ctx); 6125 memcpy(&p->fl, fl, sizeof(p->fl)); 6126 p->server = NFS_SERVER(inode); 6127 return p; 6128 } 6129 6130 static void nfs4_locku_release_calldata(void *data) 6131 { 6132 struct nfs4_unlockdata *calldata = data; 6133 nfs_free_seqid(calldata->arg.seqid); 6134 nfs4_put_lock_state(calldata->lsp); 6135 nfs_put_lock_context(calldata->l_ctx); 6136 put_nfs_open_context(calldata->ctx); 6137 kfree(calldata); 6138 } 6139 6140 static void nfs4_locku_done(struct rpc_task *task, void *data) 6141 { 6142 struct nfs4_unlockdata *calldata = data; 6143 struct nfs4_exception exception = { 6144 .inode = calldata->lsp->ls_state->inode, 6145 .stateid = &calldata->arg.stateid, 6146 }; 6147 6148 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6149 return; 6150 switch (task->tk_status) { 6151 case 0: 6152 renew_lease(calldata->server, calldata->timestamp); 6153 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6154 if (nfs4_update_lock_stateid(calldata->lsp, 6155 &calldata->res.stateid)) 6156 break; 6157 case -NFS4ERR_ADMIN_REVOKED: 6158 case -NFS4ERR_EXPIRED: 6159 nfs4_free_revoked_stateid(calldata->server, 6160 &calldata->arg.stateid, 6161 task->tk_msg.rpc_cred); 6162 case -NFS4ERR_BAD_STATEID: 6163 case -NFS4ERR_OLD_STATEID: 6164 case -NFS4ERR_STALE_STATEID: 6165 if (!nfs4_stateid_match(&calldata->arg.stateid, 6166 &calldata->lsp->ls_stateid)) 6167 rpc_restart_call_prepare(task); 6168 break; 6169 default: 6170 task->tk_status = nfs4_async_handle_exception(task, 6171 calldata->server, task->tk_status, 6172 &exception); 6173 if (exception.retry) 6174 rpc_restart_call_prepare(task); 6175 } 6176 nfs_release_seqid(calldata->arg.seqid); 6177 } 6178 6179 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6180 { 6181 struct nfs4_unlockdata *calldata = data; 6182 6183 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6184 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6185 return; 6186 6187 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6188 goto out_wait; 6189 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid); 6190 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6191 /* Note: exit _without_ running nfs4_locku_done */ 6192 goto out_no_action; 6193 } 6194 calldata->timestamp = jiffies; 6195 if (nfs4_setup_sequence(calldata->server->nfs_client, 6196 &calldata->arg.seq_args, 6197 &calldata->res.seq_res, 6198 task) != 0) 6199 nfs_release_seqid(calldata->arg.seqid); 6200 return; 6201 out_no_action: 6202 task->tk_action = NULL; 6203 out_wait: 6204 nfs4_sequence_done(task, &calldata->res.seq_res); 6205 } 6206 6207 static const struct rpc_call_ops nfs4_locku_ops = { 6208 .rpc_call_prepare = nfs4_locku_prepare, 6209 .rpc_call_done = nfs4_locku_done, 6210 .rpc_release = nfs4_locku_release_calldata, 6211 }; 6212 6213 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6214 struct nfs_open_context *ctx, 6215 struct nfs4_lock_state *lsp, 6216 struct nfs_seqid *seqid) 6217 { 6218 struct nfs4_unlockdata *data; 6219 struct rpc_message msg = { 6220 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6221 .rpc_cred = ctx->cred, 6222 }; 6223 struct rpc_task_setup task_setup_data = { 6224 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6225 .rpc_message = &msg, 6226 .callback_ops = &nfs4_locku_ops, 6227 .workqueue = nfsiod_workqueue, 6228 .flags = RPC_TASK_ASYNC, 6229 }; 6230 6231 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6232 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6233 6234 /* Ensure this is an unlock - when canceling a lock, the 6235 * canceled lock is passed in, and it won't be an unlock. 6236 */ 6237 fl->fl_type = F_UNLCK; 6238 if (fl->fl_flags & FL_CLOSE) 6239 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6240 6241 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6242 if (data == NULL) { 6243 nfs_free_seqid(seqid); 6244 return ERR_PTR(-ENOMEM); 6245 } 6246 6247 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 6248 msg.rpc_argp = &data->arg; 6249 msg.rpc_resp = &data->res; 6250 task_setup_data.callback_data = data; 6251 return rpc_run_task(&task_setup_data); 6252 } 6253 6254 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6255 { 6256 struct inode *inode = state->inode; 6257 struct nfs4_state_owner *sp = state->owner; 6258 struct nfs_inode *nfsi = NFS_I(inode); 6259 struct nfs_seqid *seqid; 6260 struct nfs4_lock_state *lsp; 6261 struct rpc_task *task; 6262 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6263 int status = 0; 6264 unsigned char fl_flags = request->fl_flags; 6265 6266 status = nfs4_set_lock_state(state, request); 6267 /* Unlock _before_ we do the RPC call */ 6268 request->fl_flags |= FL_EXISTS; 6269 /* Exclude nfs_delegation_claim_locks() */ 6270 mutex_lock(&sp->so_delegreturn_mutex); 6271 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 6272 down_read(&nfsi->rwsem); 6273 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 6274 up_read(&nfsi->rwsem); 6275 mutex_unlock(&sp->so_delegreturn_mutex); 6276 goto out; 6277 } 6278 up_read(&nfsi->rwsem); 6279 mutex_unlock(&sp->so_delegreturn_mutex); 6280 if (status != 0) 6281 goto out; 6282 /* Is this a delegated lock? */ 6283 lsp = request->fl_u.nfs4_fl.owner; 6284 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 6285 goto out; 6286 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 6287 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 6288 status = -ENOMEM; 6289 if (IS_ERR(seqid)) 6290 goto out; 6291 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 6292 status = PTR_ERR(task); 6293 if (IS_ERR(task)) 6294 goto out; 6295 status = rpc_wait_for_completion_task(task); 6296 rpc_put_task(task); 6297 out: 6298 request->fl_flags = fl_flags; 6299 trace_nfs4_unlock(request, state, F_SETLK, status); 6300 return status; 6301 } 6302 6303 struct nfs4_lockdata { 6304 struct nfs_lock_args arg; 6305 struct nfs_lock_res res; 6306 struct nfs4_lock_state *lsp; 6307 struct nfs_open_context *ctx; 6308 struct file_lock fl; 6309 unsigned long timestamp; 6310 int rpc_status; 6311 int cancelled; 6312 struct nfs_server *server; 6313 }; 6314 6315 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 6316 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 6317 gfp_t gfp_mask) 6318 { 6319 struct nfs4_lockdata *p; 6320 struct inode *inode = lsp->ls_state->inode; 6321 struct nfs_server *server = NFS_SERVER(inode); 6322 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6323 6324 p = kzalloc(sizeof(*p), gfp_mask); 6325 if (p == NULL) 6326 return NULL; 6327 6328 p->arg.fh = NFS_FH(inode); 6329 p->arg.fl = &p->fl; 6330 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 6331 if (IS_ERR(p->arg.open_seqid)) 6332 goto out_free; 6333 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 6334 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 6335 if (IS_ERR(p->arg.lock_seqid)) 6336 goto out_free_seqid; 6337 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 6338 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 6339 p->arg.lock_owner.s_dev = server->s_dev; 6340 p->res.lock_seqid = p->arg.lock_seqid; 6341 p->lsp = lsp; 6342 p->server = server; 6343 refcount_inc(&lsp->ls_count); 6344 p->ctx = get_nfs_open_context(ctx); 6345 memcpy(&p->fl, fl, sizeof(p->fl)); 6346 return p; 6347 out_free_seqid: 6348 nfs_free_seqid(p->arg.open_seqid); 6349 out_free: 6350 kfree(p); 6351 return NULL; 6352 } 6353 6354 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 6355 { 6356 struct nfs4_lockdata *data = calldata; 6357 struct nfs4_state *state = data->lsp->ls_state; 6358 6359 dprintk("%s: begin!\n", __func__); 6360 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 6361 goto out_wait; 6362 /* Do we need to do an open_to_lock_owner? */ 6363 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 6364 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 6365 goto out_release_lock_seqid; 6366 } 6367 nfs4_stateid_copy(&data->arg.open_stateid, 6368 &state->open_stateid); 6369 data->arg.new_lock_owner = 1; 6370 data->res.open_seqid = data->arg.open_seqid; 6371 } else { 6372 data->arg.new_lock_owner = 0; 6373 nfs4_stateid_copy(&data->arg.lock_stateid, 6374 &data->lsp->ls_stateid); 6375 } 6376 if (!nfs4_valid_open_stateid(state)) { 6377 data->rpc_status = -EBADF; 6378 task->tk_action = NULL; 6379 goto out_release_open_seqid; 6380 } 6381 data->timestamp = jiffies; 6382 if (nfs4_setup_sequence(data->server->nfs_client, 6383 &data->arg.seq_args, 6384 &data->res.seq_res, 6385 task) == 0) 6386 return; 6387 out_release_open_seqid: 6388 nfs_release_seqid(data->arg.open_seqid); 6389 out_release_lock_seqid: 6390 nfs_release_seqid(data->arg.lock_seqid); 6391 out_wait: 6392 nfs4_sequence_done(task, &data->res.seq_res); 6393 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 6394 } 6395 6396 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 6397 { 6398 struct nfs4_lockdata *data = calldata; 6399 struct nfs4_lock_state *lsp = data->lsp; 6400 6401 dprintk("%s: begin!\n", __func__); 6402 6403 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6404 return; 6405 6406 data->rpc_status = task->tk_status; 6407 switch (task->tk_status) { 6408 case 0: 6409 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 6410 data->timestamp); 6411 if (data->arg.new_lock) { 6412 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 6413 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) { 6414 rpc_restart_call_prepare(task); 6415 break; 6416 } 6417 } 6418 if (data->arg.new_lock_owner != 0) { 6419 nfs_confirm_seqid(&lsp->ls_seqid, 0); 6420 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 6421 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6422 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 6423 rpc_restart_call_prepare(task); 6424 break; 6425 case -NFS4ERR_BAD_STATEID: 6426 case -NFS4ERR_OLD_STATEID: 6427 case -NFS4ERR_STALE_STATEID: 6428 case -NFS4ERR_EXPIRED: 6429 if (data->arg.new_lock_owner != 0) { 6430 if (!nfs4_stateid_match(&data->arg.open_stateid, 6431 &lsp->ls_state->open_stateid)) 6432 rpc_restart_call_prepare(task); 6433 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 6434 &lsp->ls_stateid)) 6435 rpc_restart_call_prepare(task); 6436 } 6437 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 6438 } 6439 6440 static void nfs4_lock_release(void *calldata) 6441 { 6442 struct nfs4_lockdata *data = calldata; 6443 6444 dprintk("%s: begin!\n", __func__); 6445 nfs_free_seqid(data->arg.open_seqid); 6446 if (data->cancelled) { 6447 struct rpc_task *task; 6448 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 6449 data->arg.lock_seqid); 6450 if (!IS_ERR(task)) 6451 rpc_put_task_async(task); 6452 dprintk("%s: cancelling lock!\n", __func__); 6453 } else 6454 nfs_free_seqid(data->arg.lock_seqid); 6455 nfs4_put_lock_state(data->lsp); 6456 put_nfs_open_context(data->ctx); 6457 kfree(data); 6458 dprintk("%s: done!\n", __func__); 6459 } 6460 6461 static const struct rpc_call_ops nfs4_lock_ops = { 6462 .rpc_call_prepare = nfs4_lock_prepare, 6463 .rpc_call_done = nfs4_lock_done, 6464 .rpc_release = nfs4_lock_release, 6465 }; 6466 6467 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 6468 { 6469 switch (error) { 6470 case -NFS4ERR_ADMIN_REVOKED: 6471 case -NFS4ERR_EXPIRED: 6472 case -NFS4ERR_BAD_STATEID: 6473 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6474 if (new_lock_owner != 0 || 6475 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 6476 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 6477 break; 6478 case -NFS4ERR_STALE_STATEID: 6479 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6480 nfs4_schedule_lease_recovery(server->nfs_client); 6481 }; 6482 } 6483 6484 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 6485 { 6486 struct nfs4_lockdata *data; 6487 struct rpc_task *task; 6488 struct rpc_message msg = { 6489 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 6490 .rpc_cred = state->owner->so_cred, 6491 }; 6492 struct rpc_task_setup task_setup_data = { 6493 .rpc_client = NFS_CLIENT(state->inode), 6494 .rpc_message = &msg, 6495 .callback_ops = &nfs4_lock_ops, 6496 .workqueue = nfsiod_workqueue, 6497 .flags = RPC_TASK_ASYNC, 6498 }; 6499 int ret; 6500 6501 dprintk("%s: begin!\n", __func__); 6502 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 6503 fl->fl_u.nfs4_fl.owner, 6504 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 6505 if (data == NULL) 6506 return -ENOMEM; 6507 if (IS_SETLKW(cmd)) 6508 data->arg.block = 1; 6509 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 6510 recovery_type > NFS_LOCK_NEW); 6511 msg.rpc_argp = &data->arg; 6512 msg.rpc_resp = &data->res; 6513 task_setup_data.callback_data = data; 6514 if (recovery_type > NFS_LOCK_NEW) { 6515 if (recovery_type == NFS_LOCK_RECLAIM) 6516 data->arg.reclaim = NFS_LOCK_RECLAIM; 6517 } else 6518 data->arg.new_lock = 1; 6519 task = rpc_run_task(&task_setup_data); 6520 if (IS_ERR(task)) 6521 return PTR_ERR(task); 6522 ret = rpc_wait_for_completion_task(task); 6523 if (ret == 0) { 6524 ret = data->rpc_status; 6525 if (ret) 6526 nfs4_handle_setlk_error(data->server, data->lsp, 6527 data->arg.new_lock_owner, ret); 6528 } else 6529 data->cancelled = true; 6530 rpc_put_task(task); 6531 dprintk("%s: done, ret = %d!\n", __func__, ret); 6532 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 6533 return ret; 6534 } 6535 6536 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 6537 { 6538 struct nfs_server *server = NFS_SERVER(state->inode); 6539 struct nfs4_exception exception = { 6540 .inode = state->inode, 6541 }; 6542 int err; 6543 6544 do { 6545 /* Cache the lock if possible... */ 6546 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6547 return 0; 6548 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 6549 if (err != -NFS4ERR_DELAY) 6550 break; 6551 nfs4_handle_exception(server, err, &exception); 6552 } while (exception.retry); 6553 return err; 6554 } 6555 6556 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 6557 { 6558 struct nfs_server *server = NFS_SERVER(state->inode); 6559 struct nfs4_exception exception = { 6560 .inode = state->inode, 6561 }; 6562 int err; 6563 6564 err = nfs4_set_lock_state(state, request); 6565 if (err != 0) 6566 return err; 6567 if (!recover_lost_locks) { 6568 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 6569 return 0; 6570 } 6571 do { 6572 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6573 return 0; 6574 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 6575 switch (err) { 6576 default: 6577 goto out; 6578 case -NFS4ERR_GRACE: 6579 case -NFS4ERR_DELAY: 6580 nfs4_handle_exception(server, err, &exception); 6581 err = 0; 6582 } 6583 } while (exception.retry); 6584 out: 6585 return err; 6586 } 6587 6588 #if defined(CONFIG_NFS_V4_1) 6589 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 6590 { 6591 struct nfs4_lock_state *lsp; 6592 int status; 6593 6594 status = nfs4_set_lock_state(state, request); 6595 if (status != 0) 6596 return status; 6597 lsp = request->fl_u.nfs4_fl.owner; 6598 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 6599 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 6600 return 0; 6601 return nfs4_lock_expired(state, request); 6602 } 6603 #endif 6604 6605 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6606 { 6607 struct nfs_inode *nfsi = NFS_I(state->inode); 6608 struct nfs4_state_owner *sp = state->owner; 6609 unsigned char fl_flags = request->fl_flags; 6610 int status; 6611 6612 request->fl_flags |= FL_ACCESS; 6613 status = locks_lock_inode_wait(state->inode, request); 6614 if (status < 0) 6615 goto out; 6616 mutex_lock(&sp->so_delegreturn_mutex); 6617 down_read(&nfsi->rwsem); 6618 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 6619 /* Yes: cache locks! */ 6620 /* ...but avoid races with delegation recall... */ 6621 request->fl_flags = fl_flags & ~FL_SLEEP; 6622 status = locks_lock_inode_wait(state->inode, request); 6623 up_read(&nfsi->rwsem); 6624 mutex_unlock(&sp->so_delegreturn_mutex); 6625 goto out; 6626 } 6627 up_read(&nfsi->rwsem); 6628 mutex_unlock(&sp->so_delegreturn_mutex); 6629 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 6630 out: 6631 request->fl_flags = fl_flags; 6632 return status; 6633 } 6634 6635 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6636 { 6637 struct nfs4_exception exception = { 6638 .state = state, 6639 .inode = state->inode, 6640 }; 6641 int err; 6642 6643 do { 6644 err = _nfs4_proc_setlk(state, cmd, request); 6645 if (err == -NFS4ERR_DENIED) 6646 err = -EAGAIN; 6647 err = nfs4_handle_exception(NFS_SERVER(state->inode), 6648 err, &exception); 6649 } while (exception.retry); 6650 return err; 6651 } 6652 6653 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 6654 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 6655 6656 static int 6657 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 6658 struct file_lock *request) 6659 { 6660 int status = -ERESTARTSYS; 6661 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 6662 6663 while(!signalled()) { 6664 status = nfs4_proc_setlk(state, cmd, request); 6665 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6666 break; 6667 freezable_schedule_timeout_interruptible(timeout); 6668 timeout *= 2; 6669 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 6670 status = -ERESTARTSYS; 6671 } 6672 return status; 6673 } 6674 6675 #ifdef CONFIG_NFS_V4_1 6676 struct nfs4_lock_waiter { 6677 struct task_struct *task; 6678 struct inode *inode; 6679 struct nfs_lowner *owner; 6680 bool notified; 6681 }; 6682 6683 static int 6684 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 6685 { 6686 int ret; 6687 struct nfs4_lock_waiter *waiter = wait->private; 6688 6689 /* NULL key means to wake up everyone */ 6690 if (key) { 6691 struct cb_notify_lock_args *cbnl = key; 6692 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 6693 *wowner = waiter->owner; 6694 6695 /* Only wake if the callback was for the same owner. */ 6696 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 6697 return 0; 6698 6699 /* Make sure it's for the right inode */ 6700 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 6701 return 0; 6702 6703 waiter->notified = true; 6704 } 6705 6706 /* override "private" so we can use default_wake_function */ 6707 wait->private = waiter->task; 6708 ret = autoremove_wake_function(wait, mode, flags, key); 6709 wait->private = waiter; 6710 return ret; 6711 } 6712 6713 static int 6714 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6715 { 6716 int status = -ERESTARTSYS; 6717 unsigned long flags; 6718 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 6719 struct nfs_server *server = NFS_SERVER(state->inode); 6720 struct nfs_client *clp = server->nfs_client; 6721 wait_queue_head_t *q = &clp->cl_lock_waitq; 6722 struct nfs_lowner owner = { .clientid = clp->cl_clientid, 6723 .id = lsp->ls_seqid.owner_id, 6724 .s_dev = server->s_dev }; 6725 struct nfs4_lock_waiter waiter = { .task = current, 6726 .inode = state->inode, 6727 .owner = &owner, 6728 .notified = false }; 6729 wait_queue_entry_t wait; 6730 6731 /* Don't bother with waitqueue if we don't expect a callback */ 6732 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 6733 return nfs4_retry_setlk_simple(state, cmd, request); 6734 6735 init_wait(&wait); 6736 wait.private = &waiter; 6737 wait.func = nfs4_wake_lock_waiter; 6738 add_wait_queue(q, &wait); 6739 6740 while(!signalled()) { 6741 waiter.notified = false; 6742 status = nfs4_proc_setlk(state, cmd, request); 6743 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6744 break; 6745 6746 status = -ERESTARTSYS; 6747 spin_lock_irqsave(&q->lock, flags); 6748 if (waiter.notified) { 6749 spin_unlock_irqrestore(&q->lock, flags); 6750 continue; 6751 } 6752 set_current_state(TASK_INTERRUPTIBLE); 6753 spin_unlock_irqrestore(&q->lock, flags); 6754 6755 freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT); 6756 } 6757 6758 finish_wait(q, &wait); 6759 return status; 6760 } 6761 #else /* !CONFIG_NFS_V4_1 */ 6762 static inline int 6763 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6764 { 6765 return nfs4_retry_setlk_simple(state, cmd, request); 6766 } 6767 #endif 6768 6769 static int 6770 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 6771 { 6772 struct nfs_open_context *ctx; 6773 struct nfs4_state *state; 6774 int status; 6775 6776 /* verify open state */ 6777 ctx = nfs_file_open_context(filp); 6778 state = ctx->state; 6779 6780 if (IS_GETLK(cmd)) { 6781 if (state != NULL) 6782 return nfs4_proc_getlk(state, F_GETLK, request); 6783 return 0; 6784 } 6785 6786 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 6787 return -EINVAL; 6788 6789 if (request->fl_type == F_UNLCK) { 6790 if (state != NULL) 6791 return nfs4_proc_unlck(state, cmd, request); 6792 return 0; 6793 } 6794 6795 if (state == NULL) 6796 return -ENOLCK; 6797 6798 if ((request->fl_flags & FL_POSIX) && 6799 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 6800 return -ENOLCK; 6801 6802 /* 6803 * Don't rely on the VFS having checked the file open mode, 6804 * since it won't do this for flock() locks. 6805 */ 6806 switch (request->fl_type) { 6807 case F_RDLCK: 6808 if (!(filp->f_mode & FMODE_READ)) 6809 return -EBADF; 6810 break; 6811 case F_WRLCK: 6812 if (!(filp->f_mode & FMODE_WRITE)) 6813 return -EBADF; 6814 } 6815 6816 status = nfs4_set_lock_state(state, request); 6817 if (status != 0) 6818 return status; 6819 6820 return nfs4_retry_setlk(state, cmd, request); 6821 } 6822 6823 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 6824 { 6825 struct nfs_server *server = NFS_SERVER(state->inode); 6826 int err; 6827 6828 err = nfs4_set_lock_state(state, fl); 6829 if (err != 0) 6830 return err; 6831 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 6832 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 6833 } 6834 6835 struct nfs_release_lockowner_data { 6836 struct nfs4_lock_state *lsp; 6837 struct nfs_server *server; 6838 struct nfs_release_lockowner_args args; 6839 struct nfs_release_lockowner_res res; 6840 unsigned long timestamp; 6841 }; 6842 6843 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 6844 { 6845 struct nfs_release_lockowner_data *data = calldata; 6846 struct nfs_server *server = data->server; 6847 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 6848 &data->res.seq_res, task); 6849 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6850 data->timestamp = jiffies; 6851 } 6852 6853 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 6854 { 6855 struct nfs_release_lockowner_data *data = calldata; 6856 struct nfs_server *server = data->server; 6857 6858 nfs40_sequence_done(task, &data->res.seq_res); 6859 6860 switch (task->tk_status) { 6861 case 0: 6862 renew_lease(server, data->timestamp); 6863 break; 6864 case -NFS4ERR_STALE_CLIENTID: 6865 case -NFS4ERR_EXPIRED: 6866 nfs4_schedule_lease_recovery(server->nfs_client); 6867 break; 6868 case -NFS4ERR_LEASE_MOVED: 6869 case -NFS4ERR_DELAY: 6870 if (nfs4_async_handle_error(task, server, 6871 NULL, NULL) == -EAGAIN) 6872 rpc_restart_call_prepare(task); 6873 } 6874 } 6875 6876 static void nfs4_release_lockowner_release(void *calldata) 6877 { 6878 struct nfs_release_lockowner_data *data = calldata; 6879 nfs4_free_lock_state(data->server, data->lsp); 6880 kfree(calldata); 6881 } 6882 6883 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6884 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6885 .rpc_call_done = nfs4_release_lockowner_done, 6886 .rpc_release = nfs4_release_lockowner_release, 6887 }; 6888 6889 static void 6890 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6891 { 6892 struct nfs_release_lockowner_data *data; 6893 struct rpc_message msg = { 6894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6895 }; 6896 6897 if (server->nfs_client->cl_mvops->minor_version != 0) 6898 return; 6899 6900 data = kmalloc(sizeof(*data), GFP_NOFS); 6901 if (!data) 6902 return; 6903 data->lsp = lsp; 6904 data->server = server; 6905 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6906 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6907 data->args.lock_owner.s_dev = server->s_dev; 6908 6909 msg.rpc_argp = &data->args; 6910 msg.rpc_resp = &data->res; 6911 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 6912 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6913 } 6914 6915 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6916 6917 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 6918 struct dentry *unused, struct inode *inode, 6919 const char *key, const void *buf, 6920 size_t buflen, int flags) 6921 { 6922 return nfs4_proc_set_acl(inode, buf, buflen); 6923 } 6924 6925 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 6926 struct dentry *unused, struct inode *inode, 6927 const char *key, void *buf, size_t buflen) 6928 { 6929 return nfs4_proc_get_acl(inode, buf, buflen); 6930 } 6931 6932 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 6933 { 6934 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 6935 } 6936 6937 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6938 6939 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 6940 struct dentry *unused, struct inode *inode, 6941 const char *key, const void *buf, 6942 size_t buflen, int flags) 6943 { 6944 if (security_ismaclabel(key)) 6945 return nfs4_set_security_label(inode, buf, buflen); 6946 6947 return -EOPNOTSUPP; 6948 } 6949 6950 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 6951 struct dentry *unused, struct inode *inode, 6952 const char *key, void *buf, size_t buflen) 6953 { 6954 if (security_ismaclabel(key)) 6955 return nfs4_get_security_label(inode, buf, buflen); 6956 return -EOPNOTSUPP; 6957 } 6958 6959 static ssize_t 6960 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6961 { 6962 int len = 0; 6963 6964 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 6965 len = security_inode_listsecurity(inode, list, list_len); 6966 if (list_len && len > list_len) 6967 return -ERANGE; 6968 } 6969 return len; 6970 } 6971 6972 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6973 .prefix = XATTR_SECURITY_PREFIX, 6974 .get = nfs4_xattr_get_nfs4_label, 6975 .set = nfs4_xattr_set_nfs4_label, 6976 }; 6977 6978 #else 6979 6980 static ssize_t 6981 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6982 { 6983 return 0; 6984 } 6985 6986 #endif 6987 6988 /* 6989 * nfs_fhget will use either the mounted_on_fileid or the fileid 6990 */ 6991 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6992 { 6993 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6994 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6995 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6996 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6997 return; 6998 6999 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7000 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7001 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7002 fattr->nlink = 2; 7003 } 7004 7005 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7006 const struct qstr *name, 7007 struct nfs4_fs_locations *fs_locations, 7008 struct page *page) 7009 { 7010 struct nfs_server *server = NFS_SERVER(dir); 7011 u32 bitmask[3]; 7012 struct nfs4_fs_locations_arg args = { 7013 .dir_fh = NFS_FH(dir), 7014 .name = name, 7015 .page = page, 7016 .bitmask = bitmask, 7017 }; 7018 struct nfs4_fs_locations_res res = { 7019 .fs_locations = fs_locations, 7020 }; 7021 struct rpc_message msg = { 7022 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7023 .rpc_argp = &args, 7024 .rpc_resp = &res, 7025 }; 7026 int status; 7027 7028 dprintk("%s: start\n", __func__); 7029 7030 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 7031 bitmask[1] = nfs4_fattr_bitmap[1]; 7032 7033 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 7034 * is not supported */ 7035 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 7036 bitmask[0] &= ~FATTR4_WORD0_FILEID; 7037 else 7038 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 7039 7040 nfs_fattr_init(&fs_locations->fattr); 7041 fs_locations->server = server; 7042 fs_locations->nlocations = 0; 7043 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 7044 dprintk("%s: returned status = %d\n", __func__, status); 7045 return status; 7046 } 7047 7048 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7049 const struct qstr *name, 7050 struct nfs4_fs_locations *fs_locations, 7051 struct page *page) 7052 { 7053 struct nfs4_exception exception = { }; 7054 int err; 7055 do { 7056 err = _nfs4_proc_fs_locations(client, dir, name, 7057 fs_locations, page); 7058 trace_nfs4_get_fs_locations(dir, name, err); 7059 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7060 &exception); 7061 } while (exception.retry); 7062 return err; 7063 } 7064 7065 /* 7066 * This operation also signals the server that this client is 7067 * performing migration recovery. The server can stop returning 7068 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 7069 * appended to this compound to identify the client ID which is 7070 * performing recovery. 7071 */ 7072 static int _nfs40_proc_get_locations(struct inode *inode, 7073 struct nfs4_fs_locations *locations, 7074 struct page *page, struct rpc_cred *cred) 7075 { 7076 struct nfs_server *server = NFS_SERVER(inode); 7077 struct rpc_clnt *clnt = server->client; 7078 u32 bitmask[2] = { 7079 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7080 }; 7081 struct nfs4_fs_locations_arg args = { 7082 .clientid = server->nfs_client->cl_clientid, 7083 .fh = NFS_FH(inode), 7084 .page = page, 7085 .bitmask = bitmask, 7086 .migration = 1, /* skip LOOKUP */ 7087 .renew = 1, /* append RENEW */ 7088 }; 7089 struct nfs4_fs_locations_res res = { 7090 .fs_locations = locations, 7091 .migration = 1, 7092 .renew = 1, 7093 }; 7094 struct rpc_message msg = { 7095 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7096 .rpc_argp = &args, 7097 .rpc_resp = &res, 7098 .rpc_cred = cred, 7099 }; 7100 unsigned long now = jiffies; 7101 int status; 7102 7103 nfs_fattr_init(&locations->fattr); 7104 locations->server = server; 7105 locations->nlocations = 0; 7106 7107 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7108 status = nfs4_call_sync_sequence(clnt, server, &msg, 7109 &args.seq_args, &res.seq_res); 7110 if (status) 7111 return status; 7112 7113 renew_lease(server, now); 7114 return 0; 7115 } 7116 7117 #ifdef CONFIG_NFS_V4_1 7118 7119 /* 7120 * This operation also signals the server that this client is 7121 * performing migration recovery. The server can stop asserting 7122 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 7123 * performing this operation is identified in the SEQUENCE 7124 * operation in this compound. 7125 * 7126 * When the client supports GETATTR(fs_locations_info), it can 7127 * be plumbed in here. 7128 */ 7129 static int _nfs41_proc_get_locations(struct inode *inode, 7130 struct nfs4_fs_locations *locations, 7131 struct page *page, struct rpc_cred *cred) 7132 { 7133 struct nfs_server *server = NFS_SERVER(inode); 7134 struct rpc_clnt *clnt = server->client; 7135 u32 bitmask[2] = { 7136 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7137 }; 7138 struct nfs4_fs_locations_arg args = { 7139 .fh = NFS_FH(inode), 7140 .page = page, 7141 .bitmask = bitmask, 7142 .migration = 1, /* skip LOOKUP */ 7143 }; 7144 struct nfs4_fs_locations_res res = { 7145 .fs_locations = locations, 7146 .migration = 1, 7147 }; 7148 struct rpc_message msg = { 7149 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7150 .rpc_argp = &args, 7151 .rpc_resp = &res, 7152 .rpc_cred = cred, 7153 }; 7154 int status; 7155 7156 nfs_fattr_init(&locations->fattr); 7157 locations->server = server; 7158 locations->nlocations = 0; 7159 7160 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7161 status = nfs4_call_sync_sequence(clnt, server, &msg, 7162 &args.seq_args, &res.seq_res); 7163 if (status == NFS4_OK && 7164 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7165 status = -NFS4ERR_LEASE_MOVED; 7166 return status; 7167 } 7168 7169 #endif /* CONFIG_NFS_V4_1 */ 7170 7171 /** 7172 * nfs4_proc_get_locations - discover locations for a migrated FSID 7173 * @inode: inode on FSID that is migrating 7174 * @locations: result of query 7175 * @page: buffer 7176 * @cred: credential to use for this operation 7177 * 7178 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 7179 * operation failed, or a negative errno if a local error occurred. 7180 * 7181 * On success, "locations" is filled in, but if the server has 7182 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 7183 * asserted. 7184 * 7185 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 7186 * from this client that require migration recovery. 7187 */ 7188 int nfs4_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 nfs_client *clp = server->nfs_client; 7194 const struct nfs4_mig_recovery_ops *ops = 7195 clp->cl_mvops->mig_recovery_ops; 7196 struct nfs4_exception exception = { }; 7197 int status; 7198 7199 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7200 (unsigned long long)server->fsid.major, 7201 (unsigned long long)server->fsid.minor, 7202 clp->cl_hostname); 7203 nfs_display_fhandle(NFS_FH(inode), __func__); 7204 7205 do { 7206 status = ops->get_locations(inode, locations, page, cred); 7207 if (status != -NFS4ERR_DELAY) 7208 break; 7209 nfs4_handle_exception(server, status, &exception); 7210 } while (exception.retry); 7211 return status; 7212 } 7213 7214 /* 7215 * This operation also signals the server that this client is 7216 * performing "lease moved" recovery. The server can stop 7217 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 7218 * is appended to this compound to identify the client ID which is 7219 * performing recovery. 7220 */ 7221 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7222 { 7223 struct nfs_server *server = NFS_SERVER(inode); 7224 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 7225 struct rpc_clnt *clnt = server->client; 7226 struct nfs4_fsid_present_arg args = { 7227 .fh = NFS_FH(inode), 7228 .clientid = clp->cl_clientid, 7229 .renew = 1, /* append RENEW */ 7230 }; 7231 struct nfs4_fsid_present_res res = { 7232 .renew = 1, 7233 }; 7234 struct rpc_message msg = { 7235 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7236 .rpc_argp = &args, 7237 .rpc_resp = &res, 7238 .rpc_cred = cred, 7239 }; 7240 unsigned long now = jiffies; 7241 int status; 7242 7243 res.fh = nfs_alloc_fhandle(); 7244 if (res.fh == NULL) 7245 return -ENOMEM; 7246 7247 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7248 status = nfs4_call_sync_sequence(clnt, server, &msg, 7249 &args.seq_args, &res.seq_res); 7250 nfs_free_fhandle(res.fh); 7251 if (status) 7252 return status; 7253 7254 do_renew_lease(clp, now); 7255 return 0; 7256 } 7257 7258 #ifdef CONFIG_NFS_V4_1 7259 7260 /* 7261 * This operation also signals the server that this client is 7262 * performing "lease moved" recovery. The server can stop asserting 7263 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 7264 * this operation is identified in the SEQUENCE operation in this 7265 * compound. 7266 */ 7267 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7268 { 7269 struct nfs_server *server = NFS_SERVER(inode); 7270 struct rpc_clnt *clnt = server->client; 7271 struct nfs4_fsid_present_arg args = { 7272 .fh = NFS_FH(inode), 7273 }; 7274 struct nfs4_fsid_present_res res = { 7275 }; 7276 struct rpc_message msg = { 7277 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7278 .rpc_argp = &args, 7279 .rpc_resp = &res, 7280 .rpc_cred = cred, 7281 }; 7282 int status; 7283 7284 res.fh = nfs_alloc_fhandle(); 7285 if (res.fh == NULL) 7286 return -ENOMEM; 7287 7288 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 7289 status = nfs4_call_sync_sequence(clnt, server, &msg, 7290 &args.seq_args, &res.seq_res); 7291 nfs_free_fhandle(res.fh); 7292 if (status == NFS4_OK && 7293 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7294 status = -NFS4ERR_LEASE_MOVED; 7295 return status; 7296 } 7297 7298 #endif /* CONFIG_NFS_V4_1 */ 7299 7300 /** 7301 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 7302 * @inode: inode on FSID to check 7303 * @cred: credential to use for this operation 7304 * 7305 * Server indicates whether the FSID is present, moved, or not 7306 * recognized. This operation is necessary to clear a LEASE_MOVED 7307 * condition for this client ID. 7308 * 7309 * Returns NFS4_OK if the FSID is present on this server, 7310 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 7311 * NFS4ERR code if some error occurred on the server, or a 7312 * negative errno if a local failure occurred. 7313 */ 7314 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7315 { 7316 struct nfs_server *server = NFS_SERVER(inode); 7317 struct nfs_client *clp = server->nfs_client; 7318 const struct nfs4_mig_recovery_ops *ops = 7319 clp->cl_mvops->mig_recovery_ops; 7320 struct nfs4_exception exception = { }; 7321 int status; 7322 7323 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7324 (unsigned long long)server->fsid.major, 7325 (unsigned long long)server->fsid.minor, 7326 clp->cl_hostname); 7327 nfs_display_fhandle(NFS_FH(inode), __func__); 7328 7329 do { 7330 status = ops->fsid_present(inode, cred); 7331 if (status != -NFS4ERR_DELAY) 7332 break; 7333 nfs4_handle_exception(server, status, &exception); 7334 } while (exception.retry); 7335 return status; 7336 } 7337 7338 /** 7339 * If 'use_integrity' is true and the state managment nfs_client 7340 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 7341 * and the machine credential as per RFC3530bis and RFC5661 Security 7342 * Considerations sections. Otherwise, just use the user cred with the 7343 * filesystem's rpc_client. 7344 */ 7345 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7346 { 7347 int status; 7348 struct nfs4_secinfo_arg args = { 7349 .dir_fh = NFS_FH(dir), 7350 .name = name, 7351 }; 7352 struct nfs4_secinfo_res res = { 7353 .flavors = flavors, 7354 }; 7355 struct rpc_message msg = { 7356 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 7357 .rpc_argp = &args, 7358 .rpc_resp = &res, 7359 }; 7360 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 7361 struct rpc_cred *cred = NULL; 7362 7363 if (use_integrity) { 7364 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 7365 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 7366 msg.rpc_cred = cred; 7367 } 7368 7369 dprintk("NFS call secinfo %s\n", name->name); 7370 7371 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 7372 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 7373 7374 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 7375 &res.seq_res, 0); 7376 dprintk("NFS reply secinfo: %d\n", status); 7377 7378 if (cred) 7379 put_rpccred(cred); 7380 7381 return status; 7382 } 7383 7384 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 7385 struct nfs4_secinfo_flavors *flavors) 7386 { 7387 struct nfs4_exception exception = { }; 7388 int err; 7389 do { 7390 err = -NFS4ERR_WRONGSEC; 7391 7392 /* try to use integrity protection with machine cred */ 7393 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 7394 err = _nfs4_proc_secinfo(dir, name, flavors, true); 7395 7396 /* 7397 * if unable to use integrity protection, or SECINFO with 7398 * integrity protection returns NFS4ERR_WRONGSEC (which is 7399 * disallowed by spec, but exists in deployed servers) use 7400 * the current filesystem's rpc_client and the user cred. 7401 */ 7402 if (err == -NFS4ERR_WRONGSEC) 7403 err = _nfs4_proc_secinfo(dir, name, flavors, false); 7404 7405 trace_nfs4_secinfo(dir, name, err); 7406 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7407 &exception); 7408 } while (exception.retry); 7409 return err; 7410 } 7411 7412 #ifdef CONFIG_NFS_V4_1 7413 /* 7414 * Check the exchange flags returned by the server for invalid flags, having 7415 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 7416 * DS flags set. 7417 */ 7418 static int nfs4_check_cl_exchange_flags(u32 flags) 7419 { 7420 if (flags & ~EXCHGID4_FLAG_MASK_R) 7421 goto out_inval; 7422 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 7423 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 7424 goto out_inval; 7425 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 7426 goto out_inval; 7427 return NFS_OK; 7428 out_inval: 7429 return -NFS4ERR_INVAL; 7430 } 7431 7432 static bool 7433 nfs41_same_server_scope(struct nfs41_server_scope *a, 7434 struct nfs41_server_scope *b) 7435 { 7436 if (a->server_scope_sz != b->server_scope_sz) 7437 return false; 7438 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 7439 } 7440 7441 static void 7442 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 7443 { 7444 } 7445 7446 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 7447 .rpc_call_done = &nfs4_bind_one_conn_to_session_done, 7448 }; 7449 7450 /* 7451 * nfs4_proc_bind_one_conn_to_session() 7452 * 7453 * The 4.1 client currently uses the same TCP connection for the 7454 * fore and backchannel. 7455 */ 7456 static 7457 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 7458 struct rpc_xprt *xprt, 7459 struct nfs_client *clp, 7460 struct rpc_cred *cred) 7461 { 7462 int status; 7463 struct nfs41_bind_conn_to_session_args args = { 7464 .client = clp, 7465 .dir = NFS4_CDFC4_FORE_OR_BOTH, 7466 }; 7467 struct nfs41_bind_conn_to_session_res res; 7468 struct rpc_message msg = { 7469 .rpc_proc = 7470 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 7471 .rpc_argp = &args, 7472 .rpc_resp = &res, 7473 .rpc_cred = cred, 7474 }; 7475 struct rpc_task_setup task_setup_data = { 7476 .rpc_client = clnt, 7477 .rpc_xprt = xprt, 7478 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 7479 .rpc_message = &msg, 7480 .flags = RPC_TASK_TIMEOUT, 7481 }; 7482 struct rpc_task *task; 7483 7484 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 7485 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 7486 args.dir = NFS4_CDFC4_FORE; 7487 7488 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 7489 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 7490 args.dir = NFS4_CDFC4_FORE; 7491 7492 task = rpc_run_task(&task_setup_data); 7493 if (!IS_ERR(task)) { 7494 status = task->tk_status; 7495 rpc_put_task(task); 7496 } else 7497 status = PTR_ERR(task); 7498 trace_nfs4_bind_conn_to_session(clp, status); 7499 if (status == 0) { 7500 if (memcmp(res.sessionid.data, 7501 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 7502 dprintk("NFS: %s: Session ID mismatch\n", __func__); 7503 return -EIO; 7504 } 7505 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 7506 dprintk("NFS: %s: Unexpected direction from server\n", 7507 __func__); 7508 return -EIO; 7509 } 7510 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 7511 dprintk("NFS: %s: Server returned RDMA mode = true\n", 7512 __func__); 7513 return -EIO; 7514 } 7515 } 7516 7517 return status; 7518 } 7519 7520 struct rpc_bind_conn_calldata { 7521 struct nfs_client *clp; 7522 struct rpc_cred *cred; 7523 }; 7524 7525 static int 7526 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 7527 struct rpc_xprt *xprt, 7528 void *calldata) 7529 { 7530 struct rpc_bind_conn_calldata *p = calldata; 7531 7532 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 7533 } 7534 7535 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 7536 { 7537 struct rpc_bind_conn_calldata data = { 7538 .clp = clp, 7539 .cred = cred, 7540 }; 7541 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 7542 nfs4_proc_bind_conn_to_session_callback, &data); 7543 } 7544 7545 /* 7546 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 7547 * and operations we'd like to see to enable certain features in the allow map 7548 */ 7549 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 7550 .how = SP4_MACH_CRED, 7551 .enforce.u.words = { 7552 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7553 1 << (OP_EXCHANGE_ID - 32) | 7554 1 << (OP_CREATE_SESSION - 32) | 7555 1 << (OP_DESTROY_SESSION - 32) | 7556 1 << (OP_DESTROY_CLIENTID - 32) 7557 }, 7558 .allow.u.words = { 7559 [0] = 1 << (OP_CLOSE) | 7560 1 << (OP_OPEN_DOWNGRADE) | 7561 1 << (OP_LOCKU) | 7562 1 << (OP_DELEGRETURN) | 7563 1 << (OP_COMMIT), 7564 [1] = 1 << (OP_SECINFO - 32) | 7565 1 << (OP_SECINFO_NO_NAME - 32) | 7566 1 << (OP_LAYOUTRETURN - 32) | 7567 1 << (OP_TEST_STATEID - 32) | 7568 1 << (OP_FREE_STATEID - 32) | 7569 1 << (OP_WRITE - 32) 7570 } 7571 }; 7572 7573 /* 7574 * Select the state protection mode for client `clp' given the server results 7575 * from exchange_id in `sp'. 7576 * 7577 * Returns 0 on success, negative errno otherwise. 7578 */ 7579 static int nfs4_sp4_select_mode(struct nfs_client *clp, 7580 struct nfs41_state_protection *sp) 7581 { 7582 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 7583 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7584 1 << (OP_EXCHANGE_ID - 32) | 7585 1 << (OP_CREATE_SESSION - 32) | 7586 1 << (OP_DESTROY_SESSION - 32) | 7587 1 << (OP_DESTROY_CLIENTID - 32) 7588 }; 7589 unsigned long flags = 0; 7590 unsigned int i; 7591 int ret = 0; 7592 7593 if (sp->how == SP4_MACH_CRED) { 7594 /* Print state protect result */ 7595 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 7596 for (i = 0; i <= LAST_NFS4_OP; i++) { 7597 if (test_bit(i, sp->enforce.u.longs)) 7598 dfprintk(MOUNT, " enforce op %d\n", i); 7599 if (test_bit(i, sp->allow.u.longs)) 7600 dfprintk(MOUNT, " allow op %d\n", i); 7601 } 7602 7603 /* make sure nothing is on enforce list that isn't supported */ 7604 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 7605 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 7606 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7607 ret = -EINVAL; 7608 goto out; 7609 } 7610 } 7611 7612 /* 7613 * Minimal mode - state operations are allowed to use machine 7614 * credential. Note this already happens by default, so the 7615 * client doesn't have to do anything more than the negotiation. 7616 * 7617 * NOTE: we don't care if EXCHANGE_ID is in the list - 7618 * we're already using the machine cred for exchange_id 7619 * and will never use a different cred. 7620 */ 7621 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 7622 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 7623 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 7624 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 7625 dfprintk(MOUNT, "sp4_mach_cred:\n"); 7626 dfprintk(MOUNT, " minimal mode enabled\n"); 7627 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 7628 } else { 7629 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7630 ret = -EINVAL; 7631 goto out; 7632 } 7633 7634 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 7635 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 7636 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 7637 test_bit(OP_LOCKU, sp->allow.u.longs)) { 7638 dfprintk(MOUNT, " cleanup mode enabled\n"); 7639 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 7640 } 7641 7642 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 7643 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 7644 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 7645 } 7646 7647 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 7648 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 7649 dfprintk(MOUNT, " secinfo mode enabled\n"); 7650 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 7651 } 7652 7653 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 7654 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 7655 dfprintk(MOUNT, " stateid mode enabled\n"); 7656 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 7657 } 7658 7659 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 7660 dfprintk(MOUNT, " write mode enabled\n"); 7661 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 7662 } 7663 7664 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 7665 dfprintk(MOUNT, " commit mode enabled\n"); 7666 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 7667 } 7668 } 7669 out: 7670 clp->cl_sp4_flags = flags; 7671 return 0; 7672 } 7673 7674 struct nfs41_exchange_id_data { 7675 struct nfs41_exchange_id_res res; 7676 struct nfs41_exchange_id_args args; 7677 }; 7678 7679 static void nfs4_exchange_id_release(void *data) 7680 { 7681 struct nfs41_exchange_id_data *cdata = 7682 (struct nfs41_exchange_id_data *)data; 7683 7684 nfs_put_client(cdata->args.client); 7685 kfree(cdata->res.impl_id); 7686 kfree(cdata->res.server_scope); 7687 kfree(cdata->res.server_owner); 7688 kfree(cdata); 7689 } 7690 7691 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 7692 .rpc_release = nfs4_exchange_id_release, 7693 }; 7694 7695 /* 7696 * _nfs4_proc_exchange_id() 7697 * 7698 * Wrapper for EXCHANGE_ID operation. 7699 */ 7700 static struct rpc_task * 7701 nfs4_run_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7702 u32 sp4_how, struct rpc_xprt *xprt) 7703 { 7704 struct rpc_message msg = { 7705 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 7706 .rpc_cred = cred, 7707 }; 7708 struct rpc_task_setup task_setup_data = { 7709 .rpc_client = clp->cl_rpcclient, 7710 .callback_ops = &nfs4_exchange_id_call_ops, 7711 .rpc_message = &msg, 7712 .flags = RPC_TASK_TIMEOUT, 7713 }; 7714 struct nfs41_exchange_id_data *calldata; 7715 int status; 7716 7717 if (!refcount_inc_not_zero(&clp->cl_count)) 7718 return ERR_PTR(-EIO); 7719 7720 status = -ENOMEM; 7721 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7722 if (!calldata) 7723 goto out; 7724 7725 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 7726 7727 status = nfs4_init_uniform_client_string(clp); 7728 if (status) 7729 goto out_calldata; 7730 7731 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 7732 GFP_NOFS); 7733 status = -ENOMEM; 7734 if (unlikely(calldata->res.server_owner == NULL)) 7735 goto out_calldata; 7736 7737 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 7738 GFP_NOFS); 7739 if (unlikely(calldata->res.server_scope == NULL)) 7740 goto out_server_owner; 7741 7742 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 7743 if (unlikely(calldata->res.impl_id == NULL)) 7744 goto out_server_scope; 7745 7746 switch (sp4_how) { 7747 case SP4_NONE: 7748 calldata->args.state_protect.how = SP4_NONE; 7749 break; 7750 7751 case SP4_MACH_CRED: 7752 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 7753 break; 7754 7755 default: 7756 /* unsupported! */ 7757 WARN_ON_ONCE(1); 7758 status = -EINVAL; 7759 goto out_impl_id; 7760 } 7761 if (xprt) { 7762 task_setup_data.rpc_xprt = xprt; 7763 task_setup_data.flags |= RPC_TASK_SOFTCONN; 7764 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 7765 sizeof(calldata->args.verifier.data)); 7766 } 7767 calldata->args.client = clp; 7768 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 7769 EXCHGID4_FLAG_BIND_PRINC_STATEID; 7770 #ifdef CONFIG_NFS_V4_1_MIGRATION 7771 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 7772 #endif 7773 msg.rpc_argp = &calldata->args; 7774 msg.rpc_resp = &calldata->res; 7775 task_setup_data.callback_data = calldata; 7776 7777 return rpc_run_task(&task_setup_data); 7778 7779 out_impl_id: 7780 kfree(calldata->res.impl_id); 7781 out_server_scope: 7782 kfree(calldata->res.server_scope); 7783 out_server_owner: 7784 kfree(calldata->res.server_owner); 7785 out_calldata: 7786 kfree(calldata); 7787 out: 7788 nfs_put_client(clp); 7789 return ERR_PTR(status); 7790 } 7791 7792 /* 7793 * _nfs4_proc_exchange_id() 7794 * 7795 * Wrapper for EXCHANGE_ID operation. 7796 */ 7797 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7798 u32 sp4_how) 7799 { 7800 struct rpc_task *task; 7801 struct nfs41_exchange_id_args *argp; 7802 struct nfs41_exchange_id_res *resp; 7803 int status; 7804 7805 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 7806 if (IS_ERR(task)) 7807 return PTR_ERR(task); 7808 7809 argp = task->tk_msg.rpc_argp; 7810 resp = task->tk_msg.rpc_resp; 7811 status = task->tk_status; 7812 if (status != 0) 7813 goto out; 7814 7815 status = nfs4_check_cl_exchange_flags(resp->flags); 7816 if (status != 0) 7817 goto out; 7818 7819 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 7820 if (status != 0) 7821 goto out; 7822 7823 clp->cl_clientid = resp->clientid; 7824 clp->cl_exchange_flags = resp->flags; 7825 clp->cl_seqid = resp->seqid; 7826 /* Client ID is not confirmed */ 7827 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 7828 clear_bit(NFS4_SESSION_ESTABLISHED, 7829 &clp->cl_session->session_state); 7830 7831 if (clp->cl_serverscope != NULL && 7832 !nfs41_same_server_scope(clp->cl_serverscope, 7833 resp->server_scope)) { 7834 dprintk("%s: server_scope mismatch detected\n", 7835 __func__); 7836 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 7837 } 7838 7839 swap(clp->cl_serverowner, resp->server_owner); 7840 swap(clp->cl_serverscope, resp->server_scope); 7841 swap(clp->cl_implid, resp->impl_id); 7842 7843 /* Save the EXCHANGE_ID verifier session trunk tests */ 7844 memcpy(clp->cl_confirm.data, argp->verifier.data, 7845 sizeof(clp->cl_confirm.data)); 7846 out: 7847 trace_nfs4_exchange_id(clp, status); 7848 rpc_put_task(task); 7849 return status; 7850 } 7851 7852 /* 7853 * nfs4_proc_exchange_id() 7854 * 7855 * Returns zero, a negative errno, or a negative NFS4ERR status code. 7856 * 7857 * Since the clientid has expired, all compounds using sessions 7858 * associated with the stale clientid will be returning 7859 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 7860 * be in some phase of session reset. 7861 * 7862 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 7863 */ 7864 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 7865 { 7866 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 7867 int status; 7868 7869 /* try SP4_MACH_CRED if krb5i/p */ 7870 if (authflavor == RPC_AUTH_GSS_KRB5I || 7871 authflavor == RPC_AUTH_GSS_KRB5P) { 7872 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 7873 if (!status) 7874 return 0; 7875 } 7876 7877 /* try SP4_NONE */ 7878 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 7879 } 7880 7881 /** 7882 * nfs4_test_session_trunk 7883 * 7884 * This is an add_xprt_test() test function called from 7885 * rpc_clnt_setup_test_and_add_xprt. 7886 * 7887 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 7888 * and is dereferrenced in nfs4_exchange_id_release 7889 * 7890 * Upon success, add the new transport to the rpc_clnt 7891 * 7892 * @clnt: struct rpc_clnt to get new transport 7893 * @xprt: the rpc_xprt to test 7894 * @data: call data for _nfs4_proc_exchange_id. 7895 */ 7896 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 7897 void *data) 7898 { 7899 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 7900 struct rpc_task *task; 7901 int status; 7902 7903 u32 sp4_how; 7904 7905 dprintk("--> %s try %s\n", __func__, 7906 xprt->address_strings[RPC_DISPLAY_ADDR]); 7907 7908 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 7909 7910 /* Test connection for session trunking. Async exchange_id call */ 7911 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 7912 if (IS_ERR(task)) 7913 return PTR_ERR(task); 7914 7915 status = task->tk_status; 7916 if (status == 0) 7917 status = nfs4_detect_session_trunking(adata->clp, 7918 task->tk_msg.rpc_resp, xprt); 7919 7920 rpc_put_task(task); 7921 return status; 7922 } 7923 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 7924 7925 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 7926 struct rpc_cred *cred) 7927 { 7928 struct rpc_message msg = { 7929 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 7930 .rpc_argp = clp, 7931 .rpc_cred = cred, 7932 }; 7933 int status; 7934 7935 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7936 trace_nfs4_destroy_clientid(clp, status); 7937 if (status) 7938 dprintk("NFS: Got error %d from the server %s on " 7939 "DESTROY_CLIENTID.", status, clp->cl_hostname); 7940 return status; 7941 } 7942 7943 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 7944 struct rpc_cred *cred) 7945 { 7946 unsigned int loop; 7947 int ret; 7948 7949 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 7950 ret = _nfs4_proc_destroy_clientid(clp, cred); 7951 switch (ret) { 7952 case -NFS4ERR_DELAY: 7953 case -NFS4ERR_CLIENTID_BUSY: 7954 ssleep(1); 7955 break; 7956 default: 7957 return ret; 7958 } 7959 } 7960 return 0; 7961 } 7962 7963 int nfs4_destroy_clientid(struct nfs_client *clp) 7964 { 7965 struct rpc_cred *cred; 7966 int ret = 0; 7967 7968 if (clp->cl_mvops->minor_version < 1) 7969 goto out; 7970 if (clp->cl_exchange_flags == 0) 7971 goto out; 7972 if (clp->cl_preserve_clid) 7973 goto out; 7974 cred = nfs4_get_clid_cred(clp); 7975 ret = nfs4_proc_destroy_clientid(clp, cred); 7976 if (cred) 7977 put_rpccred(cred); 7978 switch (ret) { 7979 case 0: 7980 case -NFS4ERR_STALE_CLIENTID: 7981 clp->cl_exchange_flags = 0; 7982 } 7983 out: 7984 return ret; 7985 } 7986 7987 struct nfs4_get_lease_time_data { 7988 struct nfs4_get_lease_time_args *args; 7989 struct nfs4_get_lease_time_res *res; 7990 struct nfs_client *clp; 7991 }; 7992 7993 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 7994 void *calldata) 7995 { 7996 struct nfs4_get_lease_time_data *data = 7997 (struct nfs4_get_lease_time_data *)calldata; 7998 7999 dprintk("--> %s\n", __func__); 8000 /* just setup sequence, do not trigger session recovery 8001 since we're invoked within one */ 8002 nfs4_setup_sequence(data->clp, 8003 &data->args->la_seq_args, 8004 &data->res->lr_seq_res, 8005 task); 8006 dprintk("<-- %s\n", __func__); 8007 } 8008 8009 /* 8010 * Called from nfs4_state_manager thread for session setup, so don't recover 8011 * from sequence operation or clientid errors. 8012 */ 8013 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 8014 { 8015 struct nfs4_get_lease_time_data *data = 8016 (struct nfs4_get_lease_time_data *)calldata; 8017 8018 dprintk("--> %s\n", __func__); 8019 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 8020 return; 8021 switch (task->tk_status) { 8022 case -NFS4ERR_DELAY: 8023 case -NFS4ERR_GRACE: 8024 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 8025 rpc_delay(task, NFS4_POLL_RETRY_MIN); 8026 task->tk_status = 0; 8027 /* fall through */ 8028 case -NFS4ERR_RETRY_UNCACHED_REP: 8029 rpc_restart_call_prepare(task); 8030 return; 8031 } 8032 dprintk("<-- %s\n", __func__); 8033 } 8034 8035 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 8036 .rpc_call_prepare = nfs4_get_lease_time_prepare, 8037 .rpc_call_done = nfs4_get_lease_time_done, 8038 }; 8039 8040 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 8041 { 8042 struct rpc_task *task; 8043 struct nfs4_get_lease_time_args args; 8044 struct nfs4_get_lease_time_res res = { 8045 .lr_fsinfo = fsinfo, 8046 }; 8047 struct nfs4_get_lease_time_data data = { 8048 .args = &args, 8049 .res = &res, 8050 .clp = clp, 8051 }; 8052 struct rpc_message msg = { 8053 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 8054 .rpc_argp = &args, 8055 .rpc_resp = &res, 8056 }; 8057 struct rpc_task_setup task_setup = { 8058 .rpc_client = clp->cl_rpcclient, 8059 .rpc_message = &msg, 8060 .callback_ops = &nfs4_get_lease_time_ops, 8061 .callback_data = &data, 8062 .flags = RPC_TASK_TIMEOUT, 8063 }; 8064 int status; 8065 8066 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 8067 task = rpc_run_task(&task_setup); 8068 8069 if (IS_ERR(task)) 8070 return PTR_ERR(task); 8071 8072 status = task->tk_status; 8073 rpc_put_task(task); 8074 return status; 8075 } 8076 8077 /* 8078 * Initialize the values to be used by the client in CREATE_SESSION 8079 * If nfs4_init_session set the fore channel request and response sizes, 8080 * use them. 8081 * 8082 * Set the back channel max_resp_sz_cached to zero to force the client to 8083 * always set csa_cachethis to FALSE because the current implementation 8084 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 8085 */ 8086 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 8087 struct rpc_clnt *clnt) 8088 { 8089 unsigned int max_rqst_sz, max_resp_sz; 8090 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 8091 8092 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 8093 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 8094 8095 /* Fore channel attributes */ 8096 args->fc_attrs.max_rqst_sz = max_rqst_sz; 8097 args->fc_attrs.max_resp_sz = max_resp_sz; 8098 args->fc_attrs.max_ops = NFS4_MAX_OPS; 8099 args->fc_attrs.max_reqs = max_session_slots; 8100 8101 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 8102 "max_ops=%u max_reqs=%u\n", 8103 __func__, 8104 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 8105 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 8106 8107 /* Back channel attributes */ 8108 args->bc_attrs.max_rqst_sz = max_bc_payload; 8109 args->bc_attrs.max_resp_sz = max_bc_payload; 8110 args->bc_attrs.max_resp_sz_cached = 0; 8111 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 8112 args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1); 8113 8114 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 8115 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 8116 __func__, 8117 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 8118 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 8119 args->bc_attrs.max_reqs); 8120 } 8121 8122 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 8123 struct nfs41_create_session_res *res) 8124 { 8125 struct nfs4_channel_attrs *sent = &args->fc_attrs; 8126 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 8127 8128 if (rcvd->max_resp_sz > sent->max_resp_sz) 8129 return -EINVAL; 8130 /* 8131 * Our requested max_ops is the minimum we need; we're not 8132 * prepared to break up compounds into smaller pieces than that. 8133 * So, no point even trying to continue if the server won't 8134 * cooperate: 8135 */ 8136 if (rcvd->max_ops < sent->max_ops) 8137 return -EINVAL; 8138 if (rcvd->max_reqs == 0) 8139 return -EINVAL; 8140 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 8141 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 8142 return 0; 8143 } 8144 8145 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 8146 struct nfs41_create_session_res *res) 8147 { 8148 struct nfs4_channel_attrs *sent = &args->bc_attrs; 8149 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 8150 8151 if (!(res->flags & SESSION4_BACK_CHAN)) 8152 goto out; 8153 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 8154 return -EINVAL; 8155 if (rcvd->max_resp_sz < sent->max_resp_sz) 8156 return -EINVAL; 8157 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 8158 return -EINVAL; 8159 if (rcvd->max_ops > sent->max_ops) 8160 return -EINVAL; 8161 if (rcvd->max_reqs > sent->max_reqs) 8162 return -EINVAL; 8163 out: 8164 return 0; 8165 } 8166 8167 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 8168 struct nfs41_create_session_res *res) 8169 { 8170 int ret; 8171 8172 ret = nfs4_verify_fore_channel_attrs(args, res); 8173 if (ret) 8174 return ret; 8175 return nfs4_verify_back_channel_attrs(args, res); 8176 } 8177 8178 static void nfs4_update_session(struct nfs4_session *session, 8179 struct nfs41_create_session_res *res) 8180 { 8181 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 8182 /* Mark client id and session as being confirmed */ 8183 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 8184 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 8185 session->flags = res->flags; 8186 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 8187 if (res->flags & SESSION4_BACK_CHAN) 8188 memcpy(&session->bc_attrs, &res->bc_attrs, 8189 sizeof(session->bc_attrs)); 8190 } 8191 8192 static int _nfs4_proc_create_session(struct nfs_client *clp, 8193 struct rpc_cred *cred) 8194 { 8195 struct nfs4_session *session = clp->cl_session; 8196 struct nfs41_create_session_args args = { 8197 .client = clp, 8198 .clientid = clp->cl_clientid, 8199 .seqid = clp->cl_seqid, 8200 .cb_program = NFS4_CALLBACK, 8201 }; 8202 struct nfs41_create_session_res res; 8203 8204 struct rpc_message msg = { 8205 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 8206 .rpc_argp = &args, 8207 .rpc_resp = &res, 8208 .rpc_cred = cred, 8209 }; 8210 int status; 8211 8212 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 8213 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 8214 8215 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8216 trace_nfs4_create_session(clp, status); 8217 8218 switch (status) { 8219 case -NFS4ERR_STALE_CLIENTID: 8220 case -NFS4ERR_DELAY: 8221 case -ETIMEDOUT: 8222 case -EACCES: 8223 case -EAGAIN: 8224 goto out; 8225 }; 8226 8227 clp->cl_seqid++; 8228 if (!status) { 8229 /* Verify the session's negotiated channel_attrs values */ 8230 status = nfs4_verify_channel_attrs(&args, &res); 8231 /* Increment the clientid slot sequence id */ 8232 if (status) 8233 goto out; 8234 nfs4_update_session(session, &res); 8235 } 8236 out: 8237 return status; 8238 } 8239 8240 /* 8241 * Issues a CREATE_SESSION operation to the server. 8242 * It is the responsibility of the caller to verify the session is 8243 * expired before calling this routine. 8244 */ 8245 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 8246 { 8247 int status; 8248 unsigned *ptr; 8249 struct nfs4_session *session = clp->cl_session; 8250 8251 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 8252 8253 status = _nfs4_proc_create_session(clp, cred); 8254 if (status) 8255 goto out; 8256 8257 /* Init or reset the session slot tables */ 8258 status = nfs4_setup_session_slot_tables(session); 8259 dprintk("slot table setup returned %d\n", status); 8260 if (status) 8261 goto out; 8262 8263 ptr = (unsigned *)&session->sess_id.data[0]; 8264 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 8265 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 8266 out: 8267 dprintk("<-- %s\n", __func__); 8268 return status; 8269 } 8270 8271 /* 8272 * Issue the over-the-wire RPC DESTROY_SESSION. 8273 * The caller must serialize access to this routine. 8274 */ 8275 int nfs4_proc_destroy_session(struct nfs4_session *session, 8276 struct rpc_cred *cred) 8277 { 8278 struct rpc_message msg = { 8279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 8280 .rpc_argp = session, 8281 .rpc_cred = cred, 8282 }; 8283 int status = 0; 8284 8285 dprintk("--> nfs4_proc_destroy_session\n"); 8286 8287 /* session is still being setup */ 8288 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 8289 return 0; 8290 8291 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8292 trace_nfs4_destroy_session(session->clp, status); 8293 8294 if (status) 8295 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 8296 "Session has been destroyed regardless...\n", status); 8297 8298 dprintk("<-- nfs4_proc_destroy_session\n"); 8299 return status; 8300 } 8301 8302 /* 8303 * Renew the cl_session lease. 8304 */ 8305 struct nfs4_sequence_data { 8306 struct nfs_client *clp; 8307 struct nfs4_sequence_args args; 8308 struct nfs4_sequence_res res; 8309 }; 8310 8311 static void nfs41_sequence_release(void *data) 8312 { 8313 struct nfs4_sequence_data *calldata = data; 8314 struct nfs_client *clp = calldata->clp; 8315 8316 if (refcount_read(&clp->cl_count) > 1) 8317 nfs4_schedule_state_renewal(clp); 8318 nfs_put_client(clp); 8319 kfree(calldata); 8320 } 8321 8322 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8323 { 8324 switch(task->tk_status) { 8325 case -NFS4ERR_DELAY: 8326 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8327 return -EAGAIN; 8328 default: 8329 nfs4_schedule_lease_recovery(clp); 8330 } 8331 return 0; 8332 } 8333 8334 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 8335 { 8336 struct nfs4_sequence_data *calldata = data; 8337 struct nfs_client *clp = calldata->clp; 8338 8339 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 8340 return; 8341 8342 trace_nfs4_sequence(clp, task->tk_status); 8343 if (task->tk_status < 0) { 8344 dprintk("%s ERROR %d\n", __func__, task->tk_status); 8345 if (refcount_read(&clp->cl_count) == 1) 8346 goto out; 8347 8348 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 8349 rpc_restart_call_prepare(task); 8350 return; 8351 } 8352 } 8353 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 8354 out: 8355 dprintk("<-- %s\n", __func__); 8356 } 8357 8358 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 8359 { 8360 struct nfs4_sequence_data *calldata = data; 8361 struct nfs_client *clp = calldata->clp; 8362 struct nfs4_sequence_args *args; 8363 struct nfs4_sequence_res *res; 8364 8365 args = task->tk_msg.rpc_argp; 8366 res = task->tk_msg.rpc_resp; 8367 8368 nfs4_setup_sequence(clp, args, res, task); 8369 } 8370 8371 static const struct rpc_call_ops nfs41_sequence_ops = { 8372 .rpc_call_done = nfs41_sequence_call_done, 8373 .rpc_call_prepare = nfs41_sequence_prepare, 8374 .rpc_release = nfs41_sequence_release, 8375 }; 8376 8377 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 8378 struct rpc_cred *cred, 8379 struct nfs4_slot *slot, 8380 bool is_privileged) 8381 { 8382 struct nfs4_sequence_data *calldata; 8383 struct rpc_message msg = { 8384 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 8385 .rpc_cred = cred, 8386 }; 8387 struct rpc_task_setup task_setup_data = { 8388 .rpc_client = clp->cl_rpcclient, 8389 .rpc_message = &msg, 8390 .callback_ops = &nfs41_sequence_ops, 8391 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 8392 }; 8393 struct rpc_task *ret; 8394 8395 ret = ERR_PTR(-EIO); 8396 if (!refcount_inc_not_zero(&clp->cl_count)) 8397 goto out_err; 8398 8399 ret = ERR_PTR(-ENOMEM); 8400 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8401 if (calldata == NULL) 8402 goto out_put_clp; 8403 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 8404 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 8405 msg.rpc_argp = &calldata->args; 8406 msg.rpc_resp = &calldata->res; 8407 calldata->clp = clp; 8408 task_setup_data.callback_data = calldata; 8409 8410 ret = rpc_run_task(&task_setup_data); 8411 if (IS_ERR(ret)) 8412 goto out_err; 8413 return ret; 8414 out_put_clp: 8415 nfs_put_client(clp); 8416 out_err: 8417 nfs41_release_slot(slot); 8418 return ret; 8419 } 8420 8421 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 8422 { 8423 struct rpc_task *task; 8424 int ret = 0; 8425 8426 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 8427 return -EAGAIN; 8428 task = _nfs41_proc_sequence(clp, cred, NULL, false); 8429 if (IS_ERR(task)) 8430 ret = PTR_ERR(task); 8431 else 8432 rpc_put_task_async(task); 8433 dprintk("<-- %s status=%d\n", __func__, ret); 8434 return ret; 8435 } 8436 8437 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 8438 { 8439 struct rpc_task *task; 8440 int ret; 8441 8442 task = _nfs41_proc_sequence(clp, cred, NULL, true); 8443 if (IS_ERR(task)) { 8444 ret = PTR_ERR(task); 8445 goto out; 8446 } 8447 ret = rpc_wait_for_completion_task(task); 8448 if (!ret) 8449 ret = task->tk_status; 8450 rpc_put_task(task); 8451 out: 8452 dprintk("<-- %s status=%d\n", __func__, ret); 8453 return ret; 8454 } 8455 8456 struct nfs4_reclaim_complete_data { 8457 struct nfs_client *clp; 8458 struct nfs41_reclaim_complete_args arg; 8459 struct nfs41_reclaim_complete_res res; 8460 }; 8461 8462 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 8463 { 8464 struct nfs4_reclaim_complete_data *calldata = data; 8465 8466 nfs4_setup_sequence(calldata->clp, 8467 &calldata->arg.seq_args, 8468 &calldata->res.seq_res, 8469 task); 8470 } 8471 8472 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8473 { 8474 switch(task->tk_status) { 8475 case 0: 8476 wake_up_all(&clp->cl_lock_waitq); 8477 /* Fallthrough */ 8478 case -NFS4ERR_COMPLETE_ALREADY: 8479 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 8480 break; 8481 case -NFS4ERR_DELAY: 8482 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8483 /* fall through */ 8484 case -NFS4ERR_RETRY_UNCACHED_REP: 8485 return -EAGAIN; 8486 case -NFS4ERR_BADSESSION: 8487 case -NFS4ERR_DEADSESSION: 8488 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 8489 nfs4_schedule_session_recovery(clp->cl_session, 8490 task->tk_status); 8491 break; 8492 default: 8493 nfs4_schedule_lease_recovery(clp); 8494 } 8495 return 0; 8496 } 8497 8498 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 8499 { 8500 struct nfs4_reclaim_complete_data *calldata = data; 8501 struct nfs_client *clp = calldata->clp; 8502 struct nfs4_sequence_res *res = &calldata->res.seq_res; 8503 8504 dprintk("--> %s\n", __func__); 8505 if (!nfs41_sequence_done(task, res)) 8506 return; 8507 8508 trace_nfs4_reclaim_complete(clp, task->tk_status); 8509 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 8510 rpc_restart_call_prepare(task); 8511 return; 8512 } 8513 dprintk("<-- %s\n", __func__); 8514 } 8515 8516 static void nfs4_free_reclaim_complete_data(void *data) 8517 { 8518 struct nfs4_reclaim_complete_data *calldata = data; 8519 8520 kfree(calldata); 8521 } 8522 8523 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 8524 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 8525 .rpc_call_done = nfs4_reclaim_complete_done, 8526 .rpc_release = nfs4_free_reclaim_complete_data, 8527 }; 8528 8529 /* 8530 * Issue a global reclaim complete. 8531 */ 8532 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 8533 struct rpc_cred *cred) 8534 { 8535 struct nfs4_reclaim_complete_data *calldata; 8536 struct rpc_task *task; 8537 struct rpc_message msg = { 8538 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 8539 .rpc_cred = cred, 8540 }; 8541 struct rpc_task_setup task_setup_data = { 8542 .rpc_client = clp->cl_rpcclient, 8543 .rpc_message = &msg, 8544 .callback_ops = &nfs4_reclaim_complete_call_ops, 8545 .flags = RPC_TASK_ASYNC, 8546 }; 8547 int status = -ENOMEM; 8548 8549 dprintk("--> %s\n", __func__); 8550 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8551 if (calldata == NULL) 8552 goto out; 8553 calldata->clp = clp; 8554 calldata->arg.one_fs = 0; 8555 8556 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 8557 msg.rpc_argp = &calldata->arg; 8558 msg.rpc_resp = &calldata->res; 8559 task_setup_data.callback_data = calldata; 8560 task = rpc_run_task(&task_setup_data); 8561 if (IS_ERR(task)) { 8562 status = PTR_ERR(task); 8563 goto out; 8564 } 8565 status = rpc_wait_for_completion_task(task); 8566 if (status == 0) 8567 status = task->tk_status; 8568 rpc_put_task(task); 8569 out: 8570 dprintk("<-- %s status=%d\n", __func__, status); 8571 return status; 8572 } 8573 8574 static void 8575 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 8576 { 8577 struct nfs4_layoutget *lgp = calldata; 8578 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 8579 8580 dprintk("--> %s\n", __func__); 8581 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 8582 &lgp->res.seq_res, task); 8583 dprintk("<-- %s\n", __func__); 8584 } 8585 8586 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 8587 { 8588 struct nfs4_layoutget *lgp = calldata; 8589 8590 dprintk("--> %s\n", __func__); 8591 nfs41_sequence_process(task, &lgp->res.seq_res); 8592 dprintk("<-- %s\n", __func__); 8593 } 8594 8595 static int 8596 nfs4_layoutget_handle_exception(struct rpc_task *task, 8597 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 8598 { 8599 struct inode *inode = lgp->args.inode; 8600 struct nfs_server *server = NFS_SERVER(inode); 8601 struct pnfs_layout_hdr *lo; 8602 int nfs4err = task->tk_status; 8603 int err, status = 0; 8604 LIST_HEAD(head); 8605 8606 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 8607 8608 switch (nfs4err) { 8609 case 0: 8610 goto out; 8611 8612 /* 8613 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 8614 * on the file. set tk_status to -ENODATA to tell upper layer to 8615 * retry go inband. 8616 */ 8617 case -NFS4ERR_LAYOUTUNAVAILABLE: 8618 status = -ENODATA; 8619 goto out; 8620 /* 8621 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 8622 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 8623 */ 8624 case -NFS4ERR_BADLAYOUT: 8625 status = -EOVERFLOW; 8626 goto out; 8627 /* 8628 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 8629 * (or clients) writing to the same RAID stripe except when 8630 * the minlength argument is 0 (see RFC5661 section 18.43.3). 8631 * 8632 * Treat it like we would RECALLCONFLICT -- we retry for a little 8633 * while, and then eventually give up. 8634 */ 8635 case -NFS4ERR_LAYOUTTRYLATER: 8636 if (lgp->args.minlength == 0) { 8637 status = -EOVERFLOW; 8638 goto out; 8639 } 8640 status = -EBUSY; 8641 break; 8642 case -NFS4ERR_RECALLCONFLICT: 8643 status = -ERECALLCONFLICT; 8644 break; 8645 case -NFS4ERR_DELEG_REVOKED: 8646 case -NFS4ERR_ADMIN_REVOKED: 8647 case -NFS4ERR_EXPIRED: 8648 case -NFS4ERR_BAD_STATEID: 8649 exception->timeout = 0; 8650 spin_lock(&inode->i_lock); 8651 lo = NFS_I(inode)->layout; 8652 /* If the open stateid was bad, then recover it. */ 8653 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 8654 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 8655 spin_unlock(&inode->i_lock); 8656 exception->state = lgp->args.ctx->state; 8657 exception->stateid = &lgp->args.stateid; 8658 break; 8659 } 8660 8661 /* 8662 * Mark the bad layout state as invalid, then retry 8663 */ 8664 pnfs_mark_layout_stateid_invalid(lo, &head); 8665 spin_unlock(&inode->i_lock); 8666 nfs_commit_inode(inode, 0); 8667 pnfs_free_lseg_list(&head); 8668 status = -EAGAIN; 8669 goto out; 8670 } 8671 8672 nfs4_sequence_free_slot(&lgp->res.seq_res); 8673 err = nfs4_handle_exception(server, nfs4err, exception); 8674 if (!status) { 8675 if (exception->retry) 8676 status = -EAGAIN; 8677 else 8678 status = err; 8679 } 8680 out: 8681 dprintk("<-- %s\n", __func__); 8682 return status; 8683 } 8684 8685 static size_t max_response_pages(struct nfs_server *server) 8686 { 8687 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 8688 return nfs_page_array_len(0, max_resp_sz); 8689 } 8690 8691 static void nfs4_free_pages(struct page **pages, size_t size) 8692 { 8693 int i; 8694 8695 if (!pages) 8696 return; 8697 8698 for (i = 0; i < size; i++) { 8699 if (!pages[i]) 8700 break; 8701 __free_page(pages[i]); 8702 } 8703 kfree(pages); 8704 } 8705 8706 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 8707 { 8708 struct page **pages; 8709 int i; 8710 8711 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 8712 if (!pages) { 8713 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 8714 return NULL; 8715 } 8716 8717 for (i = 0; i < size; i++) { 8718 pages[i] = alloc_page(gfp_flags); 8719 if (!pages[i]) { 8720 dprintk("%s: failed to allocate page\n", __func__); 8721 nfs4_free_pages(pages, size); 8722 return NULL; 8723 } 8724 } 8725 8726 return pages; 8727 } 8728 8729 static void nfs4_layoutget_release(void *calldata) 8730 { 8731 struct nfs4_layoutget *lgp = calldata; 8732 struct inode *inode = lgp->args.inode; 8733 struct nfs_server *server = NFS_SERVER(inode); 8734 size_t max_pages = max_response_pages(server); 8735 8736 dprintk("--> %s\n", __func__); 8737 nfs4_sequence_free_slot(&lgp->res.seq_res); 8738 nfs4_free_pages(lgp->args.layout.pages, max_pages); 8739 pnfs_put_layout_hdr(NFS_I(inode)->layout); 8740 put_nfs_open_context(lgp->args.ctx); 8741 kfree(calldata); 8742 dprintk("<-- %s\n", __func__); 8743 } 8744 8745 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 8746 .rpc_call_prepare = nfs4_layoutget_prepare, 8747 .rpc_call_done = nfs4_layoutget_done, 8748 .rpc_release = nfs4_layoutget_release, 8749 }; 8750 8751 struct pnfs_layout_segment * 8752 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags) 8753 { 8754 struct inode *inode = lgp->args.inode; 8755 struct nfs_server *server = NFS_SERVER(inode); 8756 size_t max_pages = max_response_pages(server); 8757 struct rpc_task *task; 8758 struct rpc_message msg = { 8759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 8760 .rpc_argp = &lgp->args, 8761 .rpc_resp = &lgp->res, 8762 .rpc_cred = lgp->cred, 8763 }; 8764 struct rpc_task_setup task_setup_data = { 8765 .rpc_client = server->client, 8766 .rpc_message = &msg, 8767 .callback_ops = &nfs4_layoutget_call_ops, 8768 .callback_data = lgp, 8769 .flags = RPC_TASK_ASYNC, 8770 }; 8771 struct pnfs_layout_segment *lseg = NULL; 8772 struct nfs4_exception exception = { 8773 .inode = inode, 8774 .timeout = *timeout, 8775 }; 8776 int status = 0; 8777 8778 dprintk("--> %s\n", __func__); 8779 8780 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 8781 pnfs_get_layout_hdr(NFS_I(inode)->layout); 8782 8783 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 8784 if (!lgp->args.layout.pages) { 8785 nfs4_layoutget_release(lgp); 8786 return ERR_PTR(-ENOMEM); 8787 } 8788 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 8789 8790 lgp->res.layoutp = &lgp->args.layout; 8791 lgp->res.seq_res.sr_slot = NULL; 8792 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 8793 8794 task = rpc_run_task(&task_setup_data); 8795 if (IS_ERR(task)) 8796 return ERR_CAST(task); 8797 status = rpc_wait_for_completion_task(task); 8798 if (status == 0) { 8799 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 8800 *timeout = exception.timeout; 8801 } 8802 8803 trace_nfs4_layoutget(lgp->args.ctx, 8804 &lgp->args.range, 8805 &lgp->res.range, 8806 &lgp->res.stateid, 8807 status); 8808 8809 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 8810 if (status == 0 && lgp->res.layoutp->len) 8811 lseg = pnfs_layout_process(lgp); 8812 rpc_put_task(task); 8813 dprintk("<-- %s status=%d\n", __func__, status); 8814 if (status) 8815 return ERR_PTR(status); 8816 return lseg; 8817 } 8818 8819 static void 8820 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 8821 { 8822 struct nfs4_layoutreturn *lrp = calldata; 8823 8824 dprintk("--> %s\n", __func__); 8825 nfs4_setup_sequence(lrp->clp, 8826 &lrp->args.seq_args, 8827 &lrp->res.seq_res, 8828 task); 8829 } 8830 8831 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 8832 { 8833 struct nfs4_layoutreturn *lrp = calldata; 8834 struct nfs_server *server; 8835 8836 dprintk("--> %s\n", __func__); 8837 8838 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 8839 return; 8840 8841 server = NFS_SERVER(lrp->args.inode); 8842 switch (task->tk_status) { 8843 case -NFS4ERR_OLD_STATEID: 8844 if (nfs4_refresh_layout_stateid(&lrp->args.stateid, 8845 lrp->args.inode)) 8846 goto out_restart; 8847 /* Fallthrough */ 8848 default: 8849 task->tk_status = 0; 8850 /* Fallthrough */ 8851 case 0: 8852 break; 8853 case -NFS4ERR_DELAY: 8854 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 8855 break; 8856 goto out_restart; 8857 } 8858 dprintk("<-- %s\n", __func__); 8859 return; 8860 out_restart: 8861 task->tk_status = 0; 8862 nfs4_sequence_free_slot(&lrp->res.seq_res); 8863 rpc_restart_call_prepare(task); 8864 } 8865 8866 static void nfs4_layoutreturn_release(void *calldata) 8867 { 8868 struct nfs4_layoutreturn *lrp = calldata; 8869 struct pnfs_layout_hdr *lo = lrp->args.layout; 8870 8871 dprintk("--> %s\n", __func__); 8872 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 8873 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 8874 nfs4_sequence_free_slot(&lrp->res.seq_res); 8875 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 8876 lrp->ld_private.ops->free(&lrp->ld_private); 8877 pnfs_put_layout_hdr(lrp->args.layout); 8878 nfs_iput_and_deactive(lrp->inode); 8879 kfree(calldata); 8880 dprintk("<-- %s\n", __func__); 8881 } 8882 8883 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 8884 .rpc_call_prepare = nfs4_layoutreturn_prepare, 8885 .rpc_call_done = nfs4_layoutreturn_done, 8886 .rpc_release = nfs4_layoutreturn_release, 8887 }; 8888 8889 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 8890 { 8891 struct rpc_task *task; 8892 struct rpc_message msg = { 8893 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 8894 .rpc_argp = &lrp->args, 8895 .rpc_resp = &lrp->res, 8896 .rpc_cred = lrp->cred, 8897 }; 8898 struct rpc_task_setup task_setup_data = { 8899 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 8900 .rpc_message = &msg, 8901 .callback_ops = &nfs4_layoutreturn_call_ops, 8902 .callback_data = lrp, 8903 }; 8904 int status = 0; 8905 8906 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 8907 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 8908 &task_setup_data.rpc_client, &msg); 8909 8910 dprintk("--> %s\n", __func__); 8911 if (!sync) { 8912 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 8913 if (!lrp->inode) { 8914 nfs4_layoutreturn_release(lrp); 8915 return -EAGAIN; 8916 } 8917 task_setup_data.flags |= RPC_TASK_ASYNC; 8918 } 8919 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0); 8920 task = rpc_run_task(&task_setup_data); 8921 if (IS_ERR(task)) 8922 return PTR_ERR(task); 8923 if (sync) 8924 status = task->tk_status; 8925 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 8926 dprintk("<-- %s status=%d\n", __func__, status); 8927 rpc_put_task(task); 8928 return status; 8929 } 8930 8931 static int 8932 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 8933 struct pnfs_device *pdev, 8934 struct rpc_cred *cred) 8935 { 8936 struct nfs4_getdeviceinfo_args args = { 8937 .pdev = pdev, 8938 .notify_types = NOTIFY_DEVICEID4_CHANGE | 8939 NOTIFY_DEVICEID4_DELETE, 8940 }; 8941 struct nfs4_getdeviceinfo_res res = { 8942 .pdev = pdev, 8943 }; 8944 struct rpc_message msg = { 8945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 8946 .rpc_argp = &args, 8947 .rpc_resp = &res, 8948 .rpc_cred = cred, 8949 }; 8950 int status; 8951 8952 dprintk("--> %s\n", __func__); 8953 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 8954 if (res.notification & ~args.notify_types) 8955 dprintk("%s: unsupported notification\n", __func__); 8956 if (res.notification != args.notify_types) 8957 pdev->nocache = 1; 8958 8959 dprintk("<-- %s status=%d\n", __func__, status); 8960 8961 return status; 8962 } 8963 8964 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 8965 struct pnfs_device *pdev, 8966 struct rpc_cred *cred) 8967 { 8968 struct nfs4_exception exception = { }; 8969 int err; 8970 8971 do { 8972 err = nfs4_handle_exception(server, 8973 _nfs4_proc_getdeviceinfo(server, pdev, cred), 8974 &exception); 8975 } while (exception.retry); 8976 return err; 8977 } 8978 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 8979 8980 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 8981 { 8982 struct nfs4_layoutcommit_data *data = calldata; 8983 struct nfs_server *server = NFS_SERVER(data->args.inode); 8984 8985 nfs4_setup_sequence(server->nfs_client, 8986 &data->args.seq_args, 8987 &data->res.seq_res, 8988 task); 8989 } 8990 8991 static void 8992 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 8993 { 8994 struct nfs4_layoutcommit_data *data = calldata; 8995 struct nfs_server *server = NFS_SERVER(data->args.inode); 8996 8997 if (!nfs41_sequence_done(task, &data->res.seq_res)) 8998 return; 8999 9000 switch (task->tk_status) { /* Just ignore these failures */ 9001 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9002 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9003 case -NFS4ERR_BADLAYOUT: /* no layout */ 9004 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9005 task->tk_status = 0; 9006 case 0: 9007 break; 9008 default: 9009 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9010 rpc_restart_call_prepare(task); 9011 return; 9012 } 9013 } 9014 } 9015 9016 static void nfs4_layoutcommit_release(void *calldata) 9017 { 9018 struct nfs4_layoutcommit_data *data = calldata; 9019 9020 pnfs_cleanup_layoutcommit(data); 9021 nfs_post_op_update_inode_force_wcc(data->args.inode, 9022 data->res.fattr); 9023 put_rpccred(data->cred); 9024 nfs_iput_and_deactive(data->inode); 9025 kfree(data); 9026 } 9027 9028 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 9029 .rpc_call_prepare = nfs4_layoutcommit_prepare, 9030 .rpc_call_done = nfs4_layoutcommit_done, 9031 .rpc_release = nfs4_layoutcommit_release, 9032 }; 9033 9034 int 9035 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 9036 { 9037 struct rpc_message msg = { 9038 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 9039 .rpc_argp = &data->args, 9040 .rpc_resp = &data->res, 9041 .rpc_cred = data->cred, 9042 }; 9043 struct rpc_task_setup task_setup_data = { 9044 .task = &data->task, 9045 .rpc_client = NFS_CLIENT(data->args.inode), 9046 .rpc_message = &msg, 9047 .callback_ops = &nfs4_layoutcommit_ops, 9048 .callback_data = data, 9049 }; 9050 struct rpc_task *task; 9051 int status = 0; 9052 9053 dprintk("NFS: initiating layoutcommit call. sync %d " 9054 "lbw: %llu inode %lu\n", sync, 9055 data->args.lastbytewritten, 9056 data->args.inode->i_ino); 9057 9058 if (!sync) { 9059 data->inode = nfs_igrab_and_active(data->args.inode); 9060 if (data->inode == NULL) { 9061 nfs4_layoutcommit_release(data); 9062 return -EAGAIN; 9063 } 9064 task_setup_data.flags = RPC_TASK_ASYNC; 9065 } 9066 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 9067 task = rpc_run_task(&task_setup_data); 9068 if (IS_ERR(task)) 9069 return PTR_ERR(task); 9070 if (sync) 9071 status = task->tk_status; 9072 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 9073 dprintk("%s: status %d\n", __func__, status); 9074 rpc_put_task(task); 9075 return status; 9076 } 9077 9078 /** 9079 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 9080 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 9081 */ 9082 static int 9083 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9084 struct nfs_fsinfo *info, 9085 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 9086 { 9087 struct nfs41_secinfo_no_name_args args = { 9088 .style = SECINFO_STYLE_CURRENT_FH, 9089 }; 9090 struct nfs4_secinfo_res res = { 9091 .flavors = flavors, 9092 }; 9093 struct rpc_message msg = { 9094 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 9095 .rpc_argp = &args, 9096 .rpc_resp = &res, 9097 }; 9098 struct rpc_clnt *clnt = server->client; 9099 struct rpc_cred *cred = NULL; 9100 int status; 9101 9102 if (use_integrity) { 9103 clnt = server->nfs_client->cl_rpcclient; 9104 cred = nfs4_get_clid_cred(server->nfs_client); 9105 msg.rpc_cred = cred; 9106 } 9107 9108 dprintk("--> %s\n", __func__); 9109 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 9110 &res.seq_res, 0); 9111 dprintk("<-- %s status=%d\n", __func__, status); 9112 9113 if (cred) 9114 put_rpccred(cred); 9115 9116 return status; 9117 } 9118 9119 static int 9120 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9121 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 9122 { 9123 struct nfs4_exception exception = { }; 9124 int err; 9125 do { 9126 /* first try using integrity protection */ 9127 err = -NFS4ERR_WRONGSEC; 9128 9129 /* try to use integrity protection with machine cred */ 9130 if (_nfs4_is_integrity_protected(server->nfs_client)) 9131 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9132 flavors, true); 9133 9134 /* 9135 * if unable to use integrity protection, or SECINFO with 9136 * integrity protection returns NFS4ERR_WRONGSEC (which is 9137 * disallowed by spec, but exists in deployed servers) use 9138 * the current filesystem's rpc_client and the user cred. 9139 */ 9140 if (err == -NFS4ERR_WRONGSEC) 9141 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9142 flavors, false); 9143 9144 switch (err) { 9145 case 0: 9146 case -NFS4ERR_WRONGSEC: 9147 case -ENOTSUPP: 9148 goto out; 9149 default: 9150 err = nfs4_handle_exception(server, err, &exception); 9151 } 9152 } while (exception.retry); 9153 out: 9154 return err; 9155 } 9156 9157 static int 9158 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 9159 struct nfs_fsinfo *info) 9160 { 9161 int err; 9162 struct page *page; 9163 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 9164 struct nfs4_secinfo_flavors *flavors; 9165 struct nfs4_secinfo4 *secinfo; 9166 int i; 9167 9168 page = alloc_page(GFP_KERNEL); 9169 if (!page) { 9170 err = -ENOMEM; 9171 goto out; 9172 } 9173 9174 flavors = page_address(page); 9175 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 9176 9177 /* 9178 * Fall back on "guess and check" method if 9179 * the server doesn't support SECINFO_NO_NAME 9180 */ 9181 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 9182 err = nfs4_find_root_sec(server, fhandle, info); 9183 goto out_freepage; 9184 } 9185 if (err) 9186 goto out_freepage; 9187 9188 for (i = 0; i < flavors->num_flavors; i++) { 9189 secinfo = &flavors->flavors[i]; 9190 9191 switch (secinfo->flavor) { 9192 case RPC_AUTH_NULL: 9193 case RPC_AUTH_UNIX: 9194 case RPC_AUTH_GSS: 9195 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 9196 &secinfo->flavor_info); 9197 break; 9198 default: 9199 flavor = RPC_AUTH_MAXFLAVOR; 9200 break; 9201 } 9202 9203 if (!nfs_auth_info_match(&server->auth_info, flavor)) 9204 flavor = RPC_AUTH_MAXFLAVOR; 9205 9206 if (flavor != RPC_AUTH_MAXFLAVOR) { 9207 err = nfs4_lookup_root_sec(server, fhandle, 9208 info, flavor); 9209 if (!err) 9210 break; 9211 } 9212 } 9213 9214 if (flavor == RPC_AUTH_MAXFLAVOR) 9215 err = -EPERM; 9216 9217 out_freepage: 9218 put_page(page); 9219 if (err == -EACCES) 9220 return -EPERM; 9221 out: 9222 return err; 9223 } 9224 9225 static int _nfs41_test_stateid(struct nfs_server *server, 9226 nfs4_stateid *stateid, 9227 struct rpc_cred *cred) 9228 { 9229 int status; 9230 struct nfs41_test_stateid_args args = { 9231 .stateid = stateid, 9232 }; 9233 struct nfs41_test_stateid_res res; 9234 struct rpc_message msg = { 9235 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 9236 .rpc_argp = &args, 9237 .rpc_resp = &res, 9238 .rpc_cred = cred, 9239 }; 9240 struct rpc_clnt *rpc_client = server->client; 9241 9242 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9243 &rpc_client, &msg); 9244 9245 dprintk("NFS call test_stateid %p\n", stateid); 9246 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 9247 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 9248 &args.seq_args, &res.seq_res); 9249 if (status != NFS_OK) { 9250 dprintk("NFS reply test_stateid: failed, %d\n", status); 9251 return status; 9252 } 9253 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 9254 return -res.status; 9255 } 9256 9257 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 9258 int err, struct nfs4_exception *exception) 9259 { 9260 exception->retry = 0; 9261 switch(err) { 9262 case -NFS4ERR_DELAY: 9263 case -NFS4ERR_RETRY_UNCACHED_REP: 9264 nfs4_handle_exception(server, err, exception); 9265 break; 9266 case -NFS4ERR_BADSESSION: 9267 case -NFS4ERR_BADSLOT: 9268 case -NFS4ERR_BAD_HIGH_SLOT: 9269 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9270 case -NFS4ERR_DEADSESSION: 9271 nfs4_do_handle_exception(server, err, exception); 9272 } 9273 } 9274 9275 /** 9276 * nfs41_test_stateid - perform a TEST_STATEID operation 9277 * 9278 * @server: server / transport on which to perform the operation 9279 * @stateid: state ID to test 9280 * @cred: credential 9281 * 9282 * Returns NFS_OK if the server recognizes that "stateid" is valid. 9283 * Otherwise a negative NFS4ERR value is returned if the operation 9284 * failed or the state ID is not currently valid. 9285 */ 9286 static int nfs41_test_stateid(struct nfs_server *server, 9287 nfs4_stateid *stateid, 9288 struct rpc_cred *cred) 9289 { 9290 struct nfs4_exception exception = { }; 9291 int err; 9292 do { 9293 err = _nfs41_test_stateid(server, stateid, cred); 9294 nfs4_handle_delay_or_session_error(server, err, &exception); 9295 } while (exception.retry); 9296 return err; 9297 } 9298 9299 struct nfs_free_stateid_data { 9300 struct nfs_server *server; 9301 struct nfs41_free_stateid_args args; 9302 struct nfs41_free_stateid_res res; 9303 }; 9304 9305 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 9306 { 9307 struct nfs_free_stateid_data *data = calldata; 9308 nfs4_setup_sequence(data->server->nfs_client, 9309 &data->args.seq_args, 9310 &data->res.seq_res, 9311 task); 9312 } 9313 9314 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 9315 { 9316 struct nfs_free_stateid_data *data = calldata; 9317 9318 nfs41_sequence_done(task, &data->res.seq_res); 9319 9320 switch (task->tk_status) { 9321 case -NFS4ERR_DELAY: 9322 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 9323 rpc_restart_call_prepare(task); 9324 } 9325 } 9326 9327 static void nfs41_free_stateid_release(void *calldata) 9328 { 9329 kfree(calldata); 9330 } 9331 9332 static const struct rpc_call_ops nfs41_free_stateid_ops = { 9333 .rpc_call_prepare = nfs41_free_stateid_prepare, 9334 .rpc_call_done = nfs41_free_stateid_done, 9335 .rpc_release = nfs41_free_stateid_release, 9336 }; 9337 9338 /** 9339 * nfs41_free_stateid - perform a FREE_STATEID operation 9340 * 9341 * @server: server / transport on which to perform the operation 9342 * @stateid: state ID to release 9343 * @cred: credential 9344 * @is_recovery: set to true if this call needs to be privileged 9345 * 9346 * Note: this function is always asynchronous. 9347 */ 9348 static int nfs41_free_stateid(struct nfs_server *server, 9349 const nfs4_stateid *stateid, 9350 struct rpc_cred *cred, 9351 bool privileged) 9352 { 9353 struct rpc_message msg = { 9354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 9355 .rpc_cred = cred, 9356 }; 9357 struct rpc_task_setup task_setup = { 9358 .rpc_client = server->client, 9359 .rpc_message = &msg, 9360 .callback_ops = &nfs41_free_stateid_ops, 9361 .flags = RPC_TASK_ASYNC, 9362 }; 9363 struct nfs_free_stateid_data *data; 9364 struct rpc_task *task; 9365 9366 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9367 &task_setup.rpc_client, &msg); 9368 9369 dprintk("NFS call free_stateid %p\n", stateid); 9370 data = kmalloc(sizeof(*data), GFP_NOFS); 9371 if (!data) 9372 return -ENOMEM; 9373 data->server = server; 9374 nfs4_stateid_copy(&data->args.stateid, stateid); 9375 9376 task_setup.callback_data = data; 9377 9378 msg.rpc_argp = &data->args; 9379 msg.rpc_resp = &data->res; 9380 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 9381 task = rpc_run_task(&task_setup); 9382 if (IS_ERR(task)) 9383 return PTR_ERR(task); 9384 rpc_put_task(task); 9385 return 0; 9386 } 9387 9388 static void 9389 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 9390 { 9391 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 9392 9393 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 9394 nfs4_free_lock_state(server, lsp); 9395 } 9396 9397 static bool nfs41_match_stateid(const nfs4_stateid *s1, 9398 const nfs4_stateid *s2) 9399 { 9400 if (s1->type != s2->type) 9401 return false; 9402 9403 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 9404 return false; 9405 9406 if (s1->seqid == s2->seqid) 9407 return true; 9408 9409 return s1->seqid == 0 || s2->seqid == 0; 9410 } 9411 9412 #endif /* CONFIG_NFS_V4_1 */ 9413 9414 static bool nfs4_match_stateid(const nfs4_stateid *s1, 9415 const nfs4_stateid *s2) 9416 { 9417 return nfs4_stateid_match(s1, s2); 9418 } 9419 9420 9421 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 9422 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9423 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9424 .recover_open = nfs4_open_reclaim, 9425 .recover_lock = nfs4_lock_reclaim, 9426 .establish_clid = nfs4_init_clientid, 9427 .detect_trunking = nfs40_discover_server_trunking, 9428 }; 9429 9430 #if defined(CONFIG_NFS_V4_1) 9431 static const struct nfs4_state_recovery_ops nfs41_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 = nfs41_init_clientid, 9437 .reclaim_complete = nfs41_proc_reclaim_complete, 9438 .detect_trunking = nfs41_discover_server_trunking, 9439 }; 9440 #endif /* CONFIG_NFS_V4_1 */ 9441 9442 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 9443 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9444 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9445 .recover_open = nfs40_open_expired, 9446 .recover_lock = nfs4_lock_expired, 9447 .establish_clid = nfs4_init_clientid, 9448 }; 9449 9450 #if defined(CONFIG_NFS_V4_1) 9451 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 9452 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9453 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9454 .recover_open = nfs41_open_expired, 9455 .recover_lock = nfs41_lock_expired, 9456 .establish_clid = nfs41_init_clientid, 9457 }; 9458 #endif /* CONFIG_NFS_V4_1 */ 9459 9460 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 9461 .sched_state_renewal = nfs4_proc_async_renew, 9462 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 9463 .renew_lease = nfs4_proc_renew, 9464 }; 9465 9466 #if defined(CONFIG_NFS_V4_1) 9467 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 9468 .sched_state_renewal = nfs41_proc_async_sequence, 9469 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 9470 .renew_lease = nfs4_proc_sequence, 9471 }; 9472 #endif 9473 9474 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 9475 .get_locations = _nfs40_proc_get_locations, 9476 .fsid_present = _nfs40_proc_fsid_present, 9477 }; 9478 9479 #if defined(CONFIG_NFS_V4_1) 9480 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 9481 .get_locations = _nfs41_proc_get_locations, 9482 .fsid_present = _nfs41_proc_fsid_present, 9483 }; 9484 #endif /* CONFIG_NFS_V4_1 */ 9485 9486 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 9487 .minor_version = 0, 9488 .init_caps = NFS_CAP_READDIRPLUS 9489 | NFS_CAP_ATOMIC_OPEN 9490 | NFS_CAP_POSIX_LOCK, 9491 .init_client = nfs40_init_client, 9492 .shutdown_client = nfs40_shutdown_client, 9493 .match_stateid = nfs4_match_stateid, 9494 .find_root_sec = nfs4_find_root_sec, 9495 .free_lock_state = nfs4_release_lockowner, 9496 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 9497 .alloc_seqid = nfs_alloc_seqid, 9498 .call_sync_ops = &nfs40_call_sync_ops, 9499 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 9500 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 9501 .state_renewal_ops = &nfs40_state_renewal_ops, 9502 .mig_recovery_ops = &nfs40_mig_recovery_ops, 9503 }; 9504 9505 #if defined(CONFIG_NFS_V4_1) 9506 static struct nfs_seqid * 9507 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 9508 { 9509 return NULL; 9510 } 9511 9512 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 9513 .minor_version = 1, 9514 .init_caps = NFS_CAP_READDIRPLUS 9515 | NFS_CAP_ATOMIC_OPEN 9516 | NFS_CAP_POSIX_LOCK 9517 | NFS_CAP_STATEID_NFSV41 9518 | NFS_CAP_ATOMIC_OPEN_V1, 9519 .init_client = nfs41_init_client, 9520 .shutdown_client = nfs41_shutdown_client, 9521 .match_stateid = nfs41_match_stateid, 9522 .find_root_sec = nfs41_find_root_sec, 9523 .free_lock_state = nfs41_free_lock_state, 9524 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9525 .alloc_seqid = nfs_alloc_no_seqid, 9526 .session_trunk = nfs4_test_session_trunk, 9527 .call_sync_ops = &nfs41_call_sync_ops, 9528 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9529 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9530 .state_renewal_ops = &nfs41_state_renewal_ops, 9531 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9532 }; 9533 #endif 9534 9535 #if defined(CONFIG_NFS_V4_2) 9536 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 9537 .minor_version = 2, 9538 .init_caps = NFS_CAP_READDIRPLUS 9539 | NFS_CAP_ATOMIC_OPEN 9540 | NFS_CAP_POSIX_LOCK 9541 | NFS_CAP_STATEID_NFSV41 9542 | NFS_CAP_ATOMIC_OPEN_V1 9543 | NFS_CAP_ALLOCATE 9544 | NFS_CAP_COPY 9545 | NFS_CAP_DEALLOCATE 9546 | NFS_CAP_SEEK 9547 | NFS_CAP_LAYOUTSTATS 9548 | NFS_CAP_CLONE, 9549 .init_client = nfs41_init_client, 9550 .shutdown_client = nfs41_shutdown_client, 9551 .match_stateid = nfs41_match_stateid, 9552 .find_root_sec = nfs41_find_root_sec, 9553 .free_lock_state = nfs41_free_lock_state, 9554 .call_sync_ops = &nfs41_call_sync_ops, 9555 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9556 .alloc_seqid = nfs_alloc_no_seqid, 9557 .session_trunk = nfs4_test_session_trunk, 9558 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9559 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9560 .state_renewal_ops = &nfs41_state_renewal_ops, 9561 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9562 }; 9563 #endif 9564 9565 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 9566 [0] = &nfs_v4_0_minor_ops, 9567 #if defined(CONFIG_NFS_V4_1) 9568 [1] = &nfs_v4_1_minor_ops, 9569 #endif 9570 #if defined(CONFIG_NFS_V4_2) 9571 [2] = &nfs_v4_2_minor_ops, 9572 #endif 9573 }; 9574 9575 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 9576 { 9577 ssize_t error, error2; 9578 9579 error = generic_listxattr(dentry, list, size); 9580 if (error < 0) 9581 return error; 9582 if (list) { 9583 list += error; 9584 size -= error; 9585 } 9586 9587 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 9588 if (error2 < 0) 9589 return error2; 9590 return error + error2; 9591 } 9592 9593 static const struct inode_operations nfs4_dir_inode_operations = { 9594 .create = nfs_create, 9595 .lookup = nfs_lookup, 9596 .atomic_open = nfs_atomic_open, 9597 .link = nfs_link, 9598 .unlink = nfs_unlink, 9599 .symlink = nfs_symlink, 9600 .mkdir = nfs_mkdir, 9601 .rmdir = nfs_rmdir, 9602 .mknod = nfs_mknod, 9603 .rename = nfs_rename, 9604 .permission = nfs_permission, 9605 .getattr = nfs_getattr, 9606 .setattr = nfs_setattr, 9607 .listxattr = nfs4_listxattr, 9608 }; 9609 9610 static const struct inode_operations nfs4_file_inode_operations = { 9611 .permission = nfs_permission, 9612 .getattr = nfs_getattr, 9613 .setattr = nfs_setattr, 9614 .listxattr = nfs4_listxattr, 9615 }; 9616 9617 const struct nfs_rpc_ops nfs_v4_clientops = { 9618 .version = 4, /* protocol version */ 9619 .dentry_ops = &nfs4_dentry_operations, 9620 .dir_inode_ops = &nfs4_dir_inode_operations, 9621 .file_inode_ops = &nfs4_file_inode_operations, 9622 .file_ops = &nfs4_file_operations, 9623 .getroot = nfs4_proc_get_root, 9624 .submount = nfs4_submount, 9625 .try_mount = nfs4_try_mount, 9626 .getattr = nfs4_proc_getattr, 9627 .setattr = nfs4_proc_setattr, 9628 .lookup = nfs4_proc_lookup, 9629 .lookupp = nfs4_proc_lookupp, 9630 .access = nfs4_proc_access, 9631 .readlink = nfs4_proc_readlink, 9632 .create = nfs4_proc_create, 9633 .remove = nfs4_proc_remove, 9634 .unlink_setup = nfs4_proc_unlink_setup, 9635 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 9636 .unlink_done = nfs4_proc_unlink_done, 9637 .rename_setup = nfs4_proc_rename_setup, 9638 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 9639 .rename_done = nfs4_proc_rename_done, 9640 .link = nfs4_proc_link, 9641 .symlink = nfs4_proc_symlink, 9642 .mkdir = nfs4_proc_mkdir, 9643 .rmdir = nfs4_proc_rmdir, 9644 .readdir = nfs4_proc_readdir, 9645 .mknod = nfs4_proc_mknod, 9646 .statfs = nfs4_proc_statfs, 9647 .fsinfo = nfs4_proc_fsinfo, 9648 .pathconf = nfs4_proc_pathconf, 9649 .set_capabilities = nfs4_server_capabilities, 9650 .decode_dirent = nfs4_decode_dirent, 9651 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 9652 .read_setup = nfs4_proc_read_setup, 9653 .read_done = nfs4_read_done, 9654 .write_setup = nfs4_proc_write_setup, 9655 .write_done = nfs4_write_done, 9656 .commit_setup = nfs4_proc_commit_setup, 9657 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 9658 .commit_done = nfs4_commit_done, 9659 .lock = nfs4_proc_lock, 9660 .clear_acl_cache = nfs4_zap_acl_attr, 9661 .close_context = nfs4_close_context, 9662 .open_context = nfs4_atomic_open, 9663 .have_delegation = nfs4_have_delegation, 9664 .alloc_client = nfs4_alloc_client, 9665 .init_client = nfs4_init_client, 9666 .free_client = nfs4_free_client, 9667 .create_server = nfs4_create_server, 9668 .clone_server = nfs_clone_server, 9669 }; 9670 9671 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 9672 .name = XATTR_NAME_NFSV4_ACL, 9673 .list = nfs4_xattr_list_nfs4_acl, 9674 .get = nfs4_xattr_get_nfs4_acl, 9675 .set = nfs4_xattr_set_nfs4_acl, 9676 }; 9677 9678 const struct xattr_handler *nfs4_xattr_handlers[] = { 9679 &nfs4_xattr_nfs4_acl_handler, 9680 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 9681 &nfs4_xattr_nfs4_label_handler, 9682 #endif 9683 NULL 9684 }; 9685 9686 /* 9687 * Local variables: 9688 * c-basic-offset: 8 9689 * End: 9690 */ 9691