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 58 #include "nfs4_fs.h" 59 #include "delegation.h" 60 #include "internal.h" 61 #include "iostat.h" 62 #include "callback.h" 63 #include "pnfs.h" 64 #include "netns.h" 65 #include "nfs4idmap.h" 66 #include "nfs4session.h" 67 #include "fscache.h" 68 69 #include "nfs4trace.h" 70 71 #define NFSDBG_FACILITY NFSDBG_PROC 72 73 #define NFS4_POLL_RETRY_MIN (HZ/10) 74 #define NFS4_POLL_RETRY_MAX (15*HZ) 75 76 /* file attributes which can be mapped to nfs attributes */ 77 #define NFS4_VALID_ATTRS (ATTR_MODE \ 78 | ATTR_UID \ 79 | ATTR_GID \ 80 | ATTR_SIZE \ 81 | ATTR_ATIME \ 82 | ATTR_MTIME \ 83 | ATTR_CTIME \ 84 | ATTR_ATIME_SET \ 85 | ATTR_MTIME_SET) 86 87 struct nfs4_opendata; 88 static int _nfs4_proc_open(struct nfs4_opendata *data); 89 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 90 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 91 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 92 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label); 93 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label); 94 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 95 struct nfs_fattr *fattr, struct iattr *sattr, 96 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 97 struct nfs4_label *olabel); 98 #ifdef CONFIG_NFS_V4_1 99 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 100 struct rpc_cred *cred, 101 struct nfs4_slot *slot, 102 bool is_privileged); 103 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 104 struct rpc_cred *); 105 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 106 struct rpc_cred *, bool); 107 #endif 108 109 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 110 static inline struct nfs4_label * 111 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 112 struct iattr *sattr, struct nfs4_label *label) 113 { 114 int err; 115 116 if (label == NULL) 117 return NULL; 118 119 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 120 return NULL; 121 122 err = security_dentry_init_security(dentry, sattr->ia_mode, 123 &dentry->d_name, (void **)&label->label, &label->len); 124 if (err == 0) 125 return label; 126 127 return NULL; 128 } 129 static inline void 130 nfs4_label_release_security(struct nfs4_label *label) 131 { 132 if (label) 133 security_release_secctx(label->label, label->len); 134 } 135 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 136 { 137 if (label) 138 return server->attr_bitmask; 139 140 return server->attr_bitmask_nl; 141 } 142 #else 143 static inline struct nfs4_label * 144 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 145 struct iattr *sattr, struct nfs4_label *l) 146 { return NULL; } 147 static inline void 148 nfs4_label_release_security(struct nfs4_label *label) 149 { return; } 150 static inline u32 * 151 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 152 { return server->attr_bitmask; } 153 #endif 154 155 /* Prevent leaks of NFSv4 errors into userland */ 156 static int nfs4_map_errors(int err) 157 { 158 if (err >= -1000) 159 return err; 160 switch (err) { 161 case -NFS4ERR_RESOURCE: 162 case -NFS4ERR_LAYOUTTRYLATER: 163 case -NFS4ERR_RECALLCONFLICT: 164 return -EREMOTEIO; 165 case -NFS4ERR_WRONGSEC: 166 case -NFS4ERR_WRONG_CRED: 167 return -EPERM; 168 case -NFS4ERR_BADOWNER: 169 case -NFS4ERR_BADNAME: 170 return -EINVAL; 171 case -NFS4ERR_SHARE_DENIED: 172 return -EACCES; 173 case -NFS4ERR_MINOR_VERS_MISMATCH: 174 return -EPROTONOSUPPORT; 175 case -NFS4ERR_FILE_OPEN: 176 return -EBUSY; 177 default: 178 dprintk("%s could not handle NFSv4 error %d\n", 179 __func__, -err); 180 break; 181 } 182 return -EIO; 183 } 184 185 /* 186 * This is our standard bitmap for GETATTR requests. 187 */ 188 const u32 nfs4_fattr_bitmap[3] = { 189 FATTR4_WORD0_TYPE 190 | FATTR4_WORD0_CHANGE 191 | FATTR4_WORD0_SIZE 192 | FATTR4_WORD0_FSID 193 | FATTR4_WORD0_FILEID, 194 FATTR4_WORD1_MODE 195 | FATTR4_WORD1_NUMLINKS 196 | FATTR4_WORD1_OWNER 197 | FATTR4_WORD1_OWNER_GROUP 198 | FATTR4_WORD1_RAWDEV 199 | FATTR4_WORD1_SPACE_USED 200 | FATTR4_WORD1_TIME_ACCESS 201 | FATTR4_WORD1_TIME_METADATA 202 | FATTR4_WORD1_TIME_MODIFY 203 | FATTR4_WORD1_MOUNTED_ON_FILEID, 204 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 205 FATTR4_WORD2_SECURITY_LABEL 206 #endif 207 }; 208 209 static const u32 nfs4_pnfs_open_bitmap[3] = { 210 FATTR4_WORD0_TYPE 211 | FATTR4_WORD0_CHANGE 212 | FATTR4_WORD0_SIZE 213 | FATTR4_WORD0_FSID 214 | FATTR4_WORD0_FILEID, 215 FATTR4_WORD1_MODE 216 | FATTR4_WORD1_NUMLINKS 217 | FATTR4_WORD1_OWNER 218 | FATTR4_WORD1_OWNER_GROUP 219 | FATTR4_WORD1_RAWDEV 220 | FATTR4_WORD1_SPACE_USED 221 | FATTR4_WORD1_TIME_ACCESS 222 | FATTR4_WORD1_TIME_METADATA 223 | FATTR4_WORD1_TIME_MODIFY, 224 FATTR4_WORD2_MDSTHRESHOLD 225 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 226 | FATTR4_WORD2_SECURITY_LABEL 227 #endif 228 }; 229 230 static const u32 nfs4_open_noattr_bitmap[3] = { 231 FATTR4_WORD0_TYPE 232 | FATTR4_WORD0_FILEID, 233 }; 234 235 const u32 nfs4_statfs_bitmap[3] = { 236 FATTR4_WORD0_FILES_AVAIL 237 | FATTR4_WORD0_FILES_FREE 238 | FATTR4_WORD0_FILES_TOTAL, 239 FATTR4_WORD1_SPACE_AVAIL 240 | FATTR4_WORD1_SPACE_FREE 241 | FATTR4_WORD1_SPACE_TOTAL 242 }; 243 244 const u32 nfs4_pathconf_bitmap[3] = { 245 FATTR4_WORD0_MAXLINK 246 | FATTR4_WORD0_MAXNAME, 247 0 248 }; 249 250 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 251 | FATTR4_WORD0_MAXREAD 252 | FATTR4_WORD0_MAXWRITE 253 | FATTR4_WORD0_LEASE_TIME, 254 FATTR4_WORD1_TIME_DELTA 255 | FATTR4_WORD1_FS_LAYOUT_TYPES, 256 FATTR4_WORD2_LAYOUT_BLKSIZE 257 | FATTR4_WORD2_CLONE_BLKSIZE 258 }; 259 260 const u32 nfs4_fs_locations_bitmap[3] = { 261 FATTR4_WORD0_CHANGE 262 | FATTR4_WORD0_SIZE 263 | FATTR4_WORD0_FSID 264 | FATTR4_WORD0_FILEID 265 | FATTR4_WORD0_FS_LOCATIONS, 266 FATTR4_WORD1_OWNER 267 | FATTR4_WORD1_OWNER_GROUP 268 | FATTR4_WORD1_RAWDEV 269 | FATTR4_WORD1_SPACE_USED 270 | FATTR4_WORD1_TIME_ACCESS 271 | FATTR4_WORD1_TIME_METADATA 272 | FATTR4_WORD1_TIME_MODIFY 273 | FATTR4_WORD1_MOUNTED_ON_FILEID, 274 }; 275 276 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 277 struct nfs4_readdir_arg *readdir) 278 { 279 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 280 __be32 *start, *p; 281 282 if (cookie > 2) { 283 readdir->cookie = cookie; 284 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 285 return; 286 } 287 288 readdir->cookie = 0; 289 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 290 if (cookie == 2) 291 return; 292 293 /* 294 * NFSv4 servers do not return entries for '.' and '..' 295 * Therefore, we fake these entries here. We let '.' 296 * have cookie 0 and '..' have cookie 1. Note that 297 * when talking to the server, we always send cookie 0 298 * instead of 1 or 2. 299 */ 300 start = p = kmap_atomic(*readdir->pages); 301 302 if (cookie == 0) { 303 *p++ = xdr_one; /* next */ 304 *p++ = xdr_zero; /* cookie, first word */ 305 *p++ = xdr_one; /* cookie, second word */ 306 *p++ = xdr_one; /* entry len */ 307 memcpy(p, ".\0\0\0", 4); /* entry */ 308 p++; 309 *p++ = xdr_one; /* bitmap length */ 310 *p++ = htonl(attrs); /* bitmap */ 311 *p++ = htonl(12); /* attribute buffer length */ 312 *p++ = htonl(NF4DIR); 313 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 314 } 315 316 *p++ = xdr_one; /* next */ 317 *p++ = xdr_zero; /* cookie, first word */ 318 *p++ = xdr_two; /* cookie, second word */ 319 *p++ = xdr_two; /* entry len */ 320 memcpy(p, "..\0\0", 4); /* entry */ 321 p++; 322 *p++ = xdr_one; /* bitmap length */ 323 *p++ = htonl(attrs); /* bitmap */ 324 *p++ = htonl(12); /* attribute buffer length */ 325 *p++ = htonl(NF4DIR); 326 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 327 328 readdir->pgbase = (char *)p - (char *)start; 329 readdir->count -= readdir->pgbase; 330 kunmap_atomic(start); 331 } 332 333 static void nfs4_test_and_free_stateid(struct nfs_server *server, 334 nfs4_stateid *stateid, 335 struct rpc_cred *cred) 336 { 337 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 338 339 ops->test_and_free_expired(server, stateid, cred); 340 } 341 342 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 343 nfs4_stateid *stateid, 344 struct rpc_cred *cred) 345 { 346 stateid->type = NFS4_REVOKED_STATEID_TYPE; 347 nfs4_test_and_free_stateid(server, stateid, cred); 348 } 349 350 static void nfs4_free_revoked_stateid(struct nfs_server *server, 351 const nfs4_stateid *stateid, 352 struct rpc_cred *cred) 353 { 354 nfs4_stateid tmp; 355 356 nfs4_stateid_copy(&tmp, stateid); 357 __nfs4_free_revoked_stateid(server, &tmp, cred); 358 } 359 360 static long nfs4_update_delay(long *timeout) 361 { 362 long ret; 363 if (!timeout) 364 return NFS4_POLL_RETRY_MAX; 365 if (*timeout <= 0) 366 *timeout = NFS4_POLL_RETRY_MIN; 367 if (*timeout > NFS4_POLL_RETRY_MAX) 368 *timeout = NFS4_POLL_RETRY_MAX; 369 ret = *timeout; 370 *timeout <<= 1; 371 return ret; 372 } 373 374 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 375 { 376 int res = 0; 377 378 might_sleep(); 379 380 freezable_schedule_timeout_killable_unsafe( 381 nfs4_update_delay(timeout)); 382 if (fatal_signal_pending(current)) 383 res = -ERESTARTSYS; 384 return res; 385 } 386 387 /* This is the error handling routine for processes that are allowed 388 * to sleep. 389 */ 390 static int nfs4_do_handle_exception(struct nfs_server *server, 391 int errorcode, struct nfs4_exception *exception) 392 { 393 struct nfs_client *clp = server->nfs_client; 394 struct nfs4_state *state = exception->state; 395 const nfs4_stateid *stateid = exception->stateid; 396 struct inode *inode = exception->inode; 397 int ret = errorcode; 398 399 exception->delay = 0; 400 exception->recovering = 0; 401 exception->retry = 0; 402 403 if (stateid == NULL && state != NULL) 404 stateid = &state->stateid; 405 406 switch(errorcode) { 407 case 0: 408 return 0; 409 case -NFS4ERR_DELEG_REVOKED: 410 case -NFS4ERR_ADMIN_REVOKED: 411 case -NFS4ERR_EXPIRED: 412 case -NFS4ERR_BAD_STATEID: 413 if (inode != NULL && stateid != NULL) { 414 nfs_inode_find_state_and_recover(inode, 415 stateid); 416 goto wait_on_recovery; 417 } 418 case -NFS4ERR_OPENMODE: 419 if (inode) { 420 int err; 421 422 err = nfs_async_inode_return_delegation(inode, 423 stateid); 424 if (err == 0) 425 goto wait_on_recovery; 426 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 427 exception->retry = 1; 428 break; 429 } 430 } 431 if (state == NULL) 432 break; 433 ret = nfs4_schedule_stateid_recovery(server, state); 434 if (ret < 0) 435 break; 436 goto wait_on_recovery; 437 case -NFS4ERR_STALE_STATEID: 438 case -NFS4ERR_STALE_CLIENTID: 439 nfs4_schedule_lease_recovery(clp); 440 goto wait_on_recovery; 441 case -NFS4ERR_MOVED: 442 ret = nfs4_schedule_migration_recovery(server); 443 if (ret < 0) 444 break; 445 goto wait_on_recovery; 446 case -NFS4ERR_LEASE_MOVED: 447 nfs4_schedule_lease_moved_recovery(clp); 448 goto wait_on_recovery; 449 #if defined(CONFIG_NFS_V4_1) 450 case -NFS4ERR_BADSESSION: 451 case -NFS4ERR_BADSLOT: 452 case -NFS4ERR_BAD_HIGH_SLOT: 453 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 454 case -NFS4ERR_DEADSESSION: 455 case -NFS4ERR_SEQ_FALSE_RETRY: 456 case -NFS4ERR_SEQ_MISORDERED: 457 dprintk("%s ERROR: %d Reset session\n", __func__, 458 errorcode); 459 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 460 goto wait_on_recovery; 461 #endif /* defined(CONFIG_NFS_V4_1) */ 462 case -NFS4ERR_FILE_OPEN: 463 if (exception->timeout > HZ) { 464 /* We have retried a decent amount, time to 465 * fail 466 */ 467 ret = -EBUSY; 468 break; 469 } 470 case -NFS4ERR_DELAY: 471 nfs_inc_server_stats(server, NFSIOS_DELAY); 472 case -NFS4ERR_GRACE: 473 case -NFS4ERR_LAYOUTTRYLATER: 474 case -NFS4ERR_RECALLCONFLICT: 475 exception->delay = 1; 476 return 0; 477 478 case -NFS4ERR_RETRY_UNCACHED_REP: 479 case -NFS4ERR_OLD_STATEID: 480 exception->retry = 1; 481 break; 482 case -NFS4ERR_BADOWNER: 483 /* The following works around a Linux server bug! */ 484 case -NFS4ERR_BADNAME: 485 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 486 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 487 exception->retry = 1; 488 printk(KERN_WARNING "NFS: v4 server %s " 489 "does not accept raw " 490 "uid/gids. " 491 "Reenabling the idmapper.\n", 492 server->nfs_client->cl_hostname); 493 } 494 } 495 /* We failed to handle the error */ 496 return nfs4_map_errors(ret); 497 wait_on_recovery: 498 exception->recovering = 1; 499 return 0; 500 } 501 502 /* This is the error handling routine for processes that are allowed 503 * to sleep. 504 */ 505 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 506 { 507 struct nfs_client *clp = server->nfs_client; 508 int ret; 509 510 ret = nfs4_do_handle_exception(server, errorcode, exception); 511 if (exception->delay) { 512 ret = nfs4_delay(server->client, &exception->timeout); 513 goto out_retry; 514 } 515 if (exception->recovering) { 516 ret = nfs4_wait_clnt_recover(clp); 517 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 518 return -EIO; 519 goto out_retry; 520 } 521 return ret; 522 out_retry: 523 if (ret == 0) 524 exception->retry = 1; 525 return ret; 526 } 527 528 static int 529 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 530 int errorcode, struct nfs4_exception *exception) 531 { 532 struct nfs_client *clp = server->nfs_client; 533 int ret; 534 535 ret = nfs4_do_handle_exception(server, errorcode, exception); 536 if (exception->delay) { 537 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 538 goto out_retry; 539 } 540 if (exception->recovering) { 541 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 542 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 543 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 544 goto out_retry; 545 } 546 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 547 ret = -EIO; 548 return ret; 549 out_retry: 550 if (ret == 0) 551 exception->retry = 1; 552 return ret; 553 } 554 555 static int 556 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 557 struct nfs4_state *state, long *timeout) 558 { 559 struct nfs4_exception exception = { 560 .state = state, 561 }; 562 563 if (task->tk_status >= 0) 564 return 0; 565 if (timeout) 566 exception.timeout = *timeout; 567 task->tk_status = nfs4_async_handle_exception(task, server, 568 task->tk_status, 569 &exception); 570 if (exception.delay && timeout) 571 *timeout = exception.timeout; 572 if (exception.retry) 573 return -EAGAIN; 574 return 0; 575 } 576 577 /* 578 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 579 * or 'false' otherwise. 580 */ 581 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 582 { 583 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 584 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 585 } 586 587 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 588 { 589 spin_lock(&clp->cl_lock); 590 if (time_before(clp->cl_last_renewal,timestamp)) 591 clp->cl_last_renewal = timestamp; 592 spin_unlock(&clp->cl_lock); 593 } 594 595 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 596 { 597 struct nfs_client *clp = server->nfs_client; 598 599 if (!nfs4_has_session(clp)) 600 do_renew_lease(clp, timestamp); 601 } 602 603 struct nfs4_call_sync_data { 604 const struct nfs_server *seq_server; 605 struct nfs4_sequence_args *seq_args; 606 struct nfs4_sequence_res *seq_res; 607 }; 608 609 void nfs4_init_sequence(struct nfs4_sequence_args *args, 610 struct nfs4_sequence_res *res, int cache_reply) 611 { 612 args->sa_slot = NULL; 613 args->sa_cache_this = cache_reply; 614 args->sa_privileged = 0; 615 616 res->sr_slot = NULL; 617 } 618 619 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 620 { 621 args->sa_privileged = 1; 622 } 623 624 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 625 { 626 struct nfs4_slot *slot = res->sr_slot; 627 struct nfs4_slot_table *tbl; 628 629 tbl = slot->table; 630 spin_lock(&tbl->slot_tbl_lock); 631 if (!nfs41_wake_and_assign_slot(tbl, slot)) 632 nfs4_free_slot(tbl, slot); 633 spin_unlock(&tbl->slot_tbl_lock); 634 635 res->sr_slot = NULL; 636 } 637 638 static int nfs40_sequence_done(struct rpc_task *task, 639 struct nfs4_sequence_res *res) 640 { 641 if (res->sr_slot != NULL) 642 nfs40_sequence_free_slot(res); 643 return 1; 644 } 645 646 #if defined(CONFIG_NFS_V4_1) 647 648 static void nfs41_release_slot(struct nfs4_slot *slot) 649 { 650 struct nfs4_session *session; 651 struct nfs4_slot_table *tbl; 652 bool send_new_highest_used_slotid = false; 653 654 if (!slot) 655 return; 656 tbl = slot->table; 657 session = tbl->session; 658 659 /* Bump the slot sequence number */ 660 if (slot->seq_done) 661 slot->seq_nr++; 662 slot->seq_done = 0; 663 664 spin_lock(&tbl->slot_tbl_lock); 665 /* Be nice to the server: try to ensure that the last transmitted 666 * value for highest_user_slotid <= target_highest_slotid 667 */ 668 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 669 send_new_highest_used_slotid = true; 670 671 if (nfs41_wake_and_assign_slot(tbl, slot)) { 672 send_new_highest_used_slotid = false; 673 goto out_unlock; 674 } 675 nfs4_free_slot(tbl, slot); 676 677 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 678 send_new_highest_used_slotid = false; 679 out_unlock: 680 spin_unlock(&tbl->slot_tbl_lock); 681 if (send_new_highest_used_slotid) 682 nfs41_notify_server(session->clp); 683 if (waitqueue_active(&tbl->slot_waitq)) 684 wake_up_all(&tbl->slot_waitq); 685 } 686 687 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 688 { 689 nfs41_release_slot(res->sr_slot); 690 res->sr_slot = NULL; 691 } 692 693 static int nfs41_sequence_process(struct rpc_task *task, 694 struct nfs4_sequence_res *res) 695 { 696 struct nfs4_session *session; 697 struct nfs4_slot *slot = res->sr_slot; 698 struct nfs_client *clp; 699 bool interrupted = false; 700 int ret = 1; 701 702 if (slot == NULL) 703 goto out_noaction; 704 /* don't increment the sequence number if the task wasn't sent */ 705 if (!RPC_WAS_SENT(task)) 706 goto out; 707 708 session = slot->table->session; 709 710 if (slot->interrupted) { 711 if (res->sr_status != -NFS4ERR_DELAY) 712 slot->interrupted = 0; 713 interrupted = true; 714 } 715 716 trace_nfs4_sequence_done(session, res); 717 /* Check the SEQUENCE operation status */ 718 switch (res->sr_status) { 719 case 0: 720 /* Update the slot's sequence and clientid lease timer */ 721 slot->seq_done = 1; 722 clp = session->clp; 723 do_renew_lease(clp, res->sr_timestamp); 724 /* Check sequence flags */ 725 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 726 !!slot->privileged); 727 nfs41_update_target_slotid(slot->table, slot, res); 728 break; 729 case 1: 730 /* 731 * sr_status remains 1 if an RPC level error occurred. 732 * The server may or may not have processed the sequence 733 * operation.. 734 * Mark the slot as having hosted an interrupted RPC call. 735 */ 736 slot->interrupted = 1; 737 goto out; 738 case -NFS4ERR_DELAY: 739 /* The server detected a resend of the RPC call and 740 * returned NFS4ERR_DELAY as per Section 2.10.6.2 741 * of RFC5661. 742 */ 743 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 744 __func__, 745 slot->slot_nr, 746 slot->seq_nr); 747 goto out_retry; 748 case -NFS4ERR_BADSLOT: 749 /* 750 * The slot id we used was probably retired. Try again 751 * using a different slot id. 752 */ 753 if (slot->seq_nr < slot->table->target_highest_slotid) 754 goto session_recover; 755 goto retry_nowait; 756 case -NFS4ERR_SEQ_MISORDERED: 757 /* 758 * Was the last operation on this sequence interrupted? 759 * If so, retry after bumping the sequence number. 760 */ 761 if (interrupted) 762 goto retry_new_seq; 763 /* 764 * Could this slot have been previously retired? 765 * If so, then the server may be expecting seq_nr = 1! 766 */ 767 if (slot->seq_nr != 1) { 768 slot->seq_nr = 1; 769 goto retry_nowait; 770 } 771 goto session_recover; 772 case -NFS4ERR_SEQ_FALSE_RETRY: 773 if (interrupted) 774 goto retry_new_seq; 775 goto session_recover; 776 default: 777 /* Just update the slot sequence no. */ 778 slot->seq_done = 1; 779 } 780 out: 781 /* The session may be reset by one of the error handlers. */ 782 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 783 out_noaction: 784 return ret; 785 session_recover: 786 nfs4_schedule_session_recovery(session, res->sr_status); 787 goto retry_nowait; 788 retry_new_seq: 789 ++slot->seq_nr; 790 retry_nowait: 791 if (rpc_restart_call_prepare(task)) { 792 nfs41_sequence_free_slot(res); 793 task->tk_status = 0; 794 ret = 0; 795 } 796 goto out; 797 out_retry: 798 if (!rpc_restart_call(task)) 799 goto out; 800 rpc_delay(task, NFS4_POLL_RETRY_MAX); 801 return 0; 802 } 803 804 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 805 { 806 if (!nfs41_sequence_process(task, res)) 807 return 0; 808 if (res->sr_slot != NULL) 809 nfs41_sequence_free_slot(res); 810 return 1; 811 812 } 813 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 814 815 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 816 { 817 if (res->sr_slot == NULL) 818 return 1; 819 if (res->sr_slot->table->session != NULL) 820 return nfs41_sequence_process(task, res); 821 return nfs40_sequence_done(task, res); 822 } 823 824 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 825 { 826 if (res->sr_slot != NULL) { 827 if (res->sr_slot->table->session != NULL) 828 nfs41_sequence_free_slot(res); 829 else 830 nfs40_sequence_free_slot(res); 831 } 832 } 833 834 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 835 { 836 if (res->sr_slot == NULL) 837 return 1; 838 if (!res->sr_slot->table->session) 839 return nfs40_sequence_done(task, res); 840 return nfs41_sequence_done(task, res); 841 } 842 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 843 844 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 845 { 846 struct nfs4_call_sync_data *data = calldata; 847 848 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 849 850 nfs4_setup_sequence(data->seq_server->nfs_client, 851 data->seq_args, data->seq_res, task); 852 } 853 854 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 855 { 856 struct nfs4_call_sync_data *data = calldata; 857 858 nfs41_sequence_done(task, data->seq_res); 859 } 860 861 static const struct rpc_call_ops nfs41_call_sync_ops = { 862 .rpc_call_prepare = nfs41_call_sync_prepare, 863 .rpc_call_done = nfs41_call_sync_done, 864 }; 865 866 static void 867 nfs4_sequence_process_interrupted(struct nfs_client *client, 868 struct nfs4_slot *slot, struct rpc_cred *cred) 869 { 870 struct rpc_task *task; 871 872 task = _nfs41_proc_sequence(client, cred, slot, true); 873 if (!IS_ERR(task)) 874 rpc_put_task_async(task); 875 } 876 877 #else /* !CONFIG_NFS_V4_1 */ 878 879 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 880 { 881 return nfs40_sequence_done(task, res); 882 } 883 884 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 885 { 886 if (res->sr_slot != NULL) 887 nfs40_sequence_free_slot(res); 888 } 889 890 int nfs4_sequence_done(struct rpc_task *task, 891 struct nfs4_sequence_res *res) 892 { 893 return nfs40_sequence_done(task, res); 894 } 895 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 896 897 static void 898 nfs4_sequence_process_interrupted(struct nfs_client *client, 899 struct nfs4_slot *slot, struct rpc_cred *cred) 900 { 901 WARN_ON_ONCE(1); 902 slot->interrupted = 0; 903 } 904 905 #endif /* !CONFIG_NFS_V4_1 */ 906 907 static 908 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 909 struct nfs4_sequence_res *res, 910 struct nfs4_slot *slot) 911 { 912 if (!slot) 913 return; 914 slot->privileged = args->sa_privileged ? 1 : 0; 915 args->sa_slot = slot; 916 917 res->sr_slot = slot; 918 res->sr_timestamp = jiffies; 919 res->sr_status_flags = 0; 920 res->sr_status = 1; 921 922 } 923 924 int nfs4_setup_sequence(struct nfs_client *client, 925 struct nfs4_sequence_args *args, 926 struct nfs4_sequence_res *res, 927 struct rpc_task *task) 928 { 929 struct nfs4_session *session = nfs4_get_session(client); 930 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 931 struct nfs4_slot *slot; 932 933 /* slot already allocated? */ 934 if (res->sr_slot != NULL) 935 goto out_start; 936 937 if (session) { 938 tbl = &session->fc_slot_table; 939 task->tk_timeout = 0; 940 } 941 942 for (;;) { 943 spin_lock(&tbl->slot_tbl_lock); 944 /* The state manager will wait until the slot table is empty */ 945 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 946 goto out_sleep; 947 948 slot = nfs4_alloc_slot(tbl); 949 if (IS_ERR(slot)) { 950 /* Try again in 1/4 second */ 951 if (slot == ERR_PTR(-ENOMEM)) 952 task->tk_timeout = HZ >> 2; 953 goto out_sleep; 954 } 955 spin_unlock(&tbl->slot_tbl_lock); 956 957 if (likely(!slot->interrupted)) 958 break; 959 nfs4_sequence_process_interrupted(client, 960 slot, task->tk_msg.rpc_cred); 961 } 962 963 nfs4_sequence_attach_slot(args, res, slot); 964 965 trace_nfs4_setup_sequence(session, args); 966 out_start: 967 rpc_call_start(task); 968 return 0; 969 970 out_sleep: 971 if (args->sa_privileged) 972 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 973 NULL, RPC_PRIORITY_PRIVILEGED); 974 else 975 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 976 spin_unlock(&tbl->slot_tbl_lock); 977 return -EAGAIN; 978 } 979 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 980 981 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 982 { 983 struct nfs4_call_sync_data *data = calldata; 984 nfs4_setup_sequence(data->seq_server->nfs_client, 985 data->seq_args, data->seq_res, task); 986 } 987 988 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 989 { 990 struct nfs4_call_sync_data *data = calldata; 991 nfs4_sequence_done(task, data->seq_res); 992 } 993 994 static const struct rpc_call_ops nfs40_call_sync_ops = { 995 .rpc_call_prepare = nfs40_call_sync_prepare, 996 .rpc_call_done = nfs40_call_sync_done, 997 }; 998 999 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1000 struct nfs_server *server, 1001 struct rpc_message *msg, 1002 struct nfs4_sequence_args *args, 1003 struct nfs4_sequence_res *res) 1004 { 1005 int ret; 1006 struct rpc_task *task; 1007 struct nfs_client *clp = server->nfs_client; 1008 struct nfs4_call_sync_data data = { 1009 .seq_server = server, 1010 .seq_args = args, 1011 .seq_res = res, 1012 }; 1013 struct rpc_task_setup task_setup = { 1014 .rpc_client = clnt, 1015 .rpc_message = msg, 1016 .callback_ops = clp->cl_mvops->call_sync_ops, 1017 .callback_data = &data 1018 }; 1019 1020 task = rpc_run_task(&task_setup); 1021 if (IS_ERR(task)) 1022 ret = PTR_ERR(task); 1023 else { 1024 ret = task->tk_status; 1025 rpc_put_task(task); 1026 } 1027 return ret; 1028 } 1029 1030 int nfs4_call_sync(struct rpc_clnt *clnt, 1031 struct nfs_server *server, 1032 struct rpc_message *msg, 1033 struct nfs4_sequence_args *args, 1034 struct nfs4_sequence_res *res, 1035 int cache_reply) 1036 { 1037 nfs4_init_sequence(args, res, cache_reply); 1038 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1039 } 1040 1041 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1042 unsigned long timestamp) 1043 { 1044 struct nfs_inode *nfsi = NFS_I(dir); 1045 1046 spin_lock(&dir->i_lock); 1047 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1048 if (cinfo->atomic && cinfo->before == dir->i_version) { 1049 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; 1050 nfsi->attrtimeo_timestamp = jiffies; 1051 } else { 1052 nfs_force_lookup_revalidate(dir); 1053 if (cinfo->before != dir->i_version) 1054 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | 1055 NFS_INO_INVALID_ACL; 1056 } 1057 dir->i_version = cinfo->after; 1058 nfsi->read_cache_jiffies = timestamp; 1059 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1060 nfs_fscache_invalidate(dir); 1061 spin_unlock(&dir->i_lock); 1062 } 1063 1064 struct nfs4_opendata { 1065 struct kref kref; 1066 struct nfs_openargs o_arg; 1067 struct nfs_openres o_res; 1068 struct nfs_open_confirmargs c_arg; 1069 struct nfs_open_confirmres c_res; 1070 struct nfs4_string owner_name; 1071 struct nfs4_string group_name; 1072 struct nfs4_label *a_label; 1073 struct nfs_fattr f_attr; 1074 struct nfs4_label *f_label; 1075 struct dentry *dir; 1076 struct dentry *dentry; 1077 struct nfs4_state_owner *owner; 1078 struct nfs4_state *state; 1079 struct iattr attrs; 1080 unsigned long timestamp; 1081 bool rpc_done; 1082 bool file_created; 1083 bool is_recover; 1084 bool cancelled; 1085 int rpc_status; 1086 }; 1087 1088 struct nfs4_open_createattrs { 1089 struct nfs4_label *label; 1090 struct iattr *sattr; 1091 const __u32 verf[2]; 1092 }; 1093 1094 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1095 int err, struct nfs4_exception *exception) 1096 { 1097 if (err != -EINVAL) 1098 return false; 1099 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1100 return false; 1101 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1102 exception->retry = 1; 1103 return true; 1104 } 1105 1106 static u32 1107 nfs4_map_atomic_open_share(struct nfs_server *server, 1108 fmode_t fmode, int openflags) 1109 { 1110 u32 res = 0; 1111 1112 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1113 case FMODE_READ: 1114 res = NFS4_SHARE_ACCESS_READ; 1115 break; 1116 case FMODE_WRITE: 1117 res = NFS4_SHARE_ACCESS_WRITE; 1118 break; 1119 case FMODE_READ|FMODE_WRITE: 1120 res = NFS4_SHARE_ACCESS_BOTH; 1121 } 1122 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1123 goto out; 1124 /* Want no delegation if we're using O_DIRECT */ 1125 if (openflags & O_DIRECT) 1126 res |= NFS4_SHARE_WANT_NO_DELEG; 1127 out: 1128 return res; 1129 } 1130 1131 static enum open_claim_type4 1132 nfs4_map_atomic_open_claim(struct nfs_server *server, 1133 enum open_claim_type4 claim) 1134 { 1135 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1136 return claim; 1137 switch (claim) { 1138 default: 1139 return claim; 1140 case NFS4_OPEN_CLAIM_FH: 1141 return NFS4_OPEN_CLAIM_NULL; 1142 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1143 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1144 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1145 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1146 } 1147 } 1148 1149 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1150 { 1151 p->o_res.f_attr = &p->f_attr; 1152 p->o_res.f_label = p->f_label; 1153 p->o_res.seqid = p->o_arg.seqid; 1154 p->c_res.seqid = p->c_arg.seqid; 1155 p->o_res.server = p->o_arg.server; 1156 p->o_res.access_request = p->o_arg.access; 1157 nfs_fattr_init(&p->f_attr); 1158 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1159 } 1160 1161 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1162 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1163 const struct nfs4_open_createattrs *c, 1164 enum open_claim_type4 claim, 1165 gfp_t gfp_mask) 1166 { 1167 struct dentry *parent = dget_parent(dentry); 1168 struct inode *dir = d_inode(parent); 1169 struct nfs_server *server = NFS_SERVER(dir); 1170 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1171 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1172 struct nfs4_opendata *p; 1173 1174 p = kzalloc(sizeof(*p), gfp_mask); 1175 if (p == NULL) 1176 goto err; 1177 1178 p->f_label = nfs4_label_alloc(server, gfp_mask); 1179 if (IS_ERR(p->f_label)) 1180 goto err_free_p; 1181 1182 p->a_label = nfs4_label_alloc(server, gfp_mask); 1183 if (IS_ERR(p->a_label)) 1184 goto err_free_f; 1185 1186 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1187 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1188 if (IS_ERR(p->o_arg.seqid)) 1189 goto err_free_label; 1190 nfs_sb_active(dentry->d_sb); 1191 p->dentry = dget(dentry); 1192 p->dir = parent; 1193 p->owner = sp; 1194 atomic_inc(&sp->so_count); 1195 p->o_arg.open_flags = flags; 1196 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1197 p->o_arg.umask = current_umask(); 1198 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1199 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1200 fmode, flags); 1201 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1202 * will return permission denied for all bits until close */ 1203 if (!(flags & O_EXCL)) { 1204 /* ask server to check for all possible rights as results 1205 * are cached */ 1206 switch (p->o_arg.claim) { 1207 default: 1208 break; 1209 case NFS4_OPEN_CLAIM_NULL: 1210 case NFS4_OPEN_CLAIM_FH: 1211 p->o_arg.access = NFS4_ACCESS_READ | 1212 NFS4_ACCESS_MODIFY | 1213 NFS4_ACCESS_EXTEND | 1214 NFS4_ACCESS_EXECUTE; 1215 } 1216 } 1217 p->o_arg.clientid = server->nfs_client->cl_clientid; 1218 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1219 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1220 p->o_arg.name = &dentry->d_name; 1221 p->o_arg.server = server; 1222 p->o_arg.bitmask = nfs4_bitmask(server, label); 1223 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1224 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1225 switch (p->o_arg.claim) { 1226 case NFS4_OPEN_CLAIM_NULL: 1227 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1228 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1229 p->o_arg.fh = NFS_FH(dir); 1230 break; 1231 case NFS4_OPEN_CLAIM_PREVIOUS: 1232 case NFS4_OPEN_CLAIM_FH: 1233 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1234 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1235 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1236 } 1237 if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) { 1238 p->o_arg.u.attrs = &p->attrs; 1239 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1240 1241 memcpy(p->o_arg.u.verifier.data, c->verf, 1242 sizeof(p->o_arg.u.verifier.data)); 1243 } 1244 p->c_arg.fh = &p->o_res.fh; 1245 p->c_arg.stateid = &p->o_res.stateid; 1246 p->c_arg.seqid = p->o_arg.seqid; 1247 nfs4_init_opendata_res(p); 1248 kref_init(&p->kref); 1249 return p; 1250 1251 err_free_label: 1252 nfs4_label_free(p->a_label); 1253 err_free_f: 1254 nfs4_label_free(p->f_label); 1255 err_free_p: 1256 kfree(p); 1257 err: 1258 dput(parent); 1259 return NULL; 1260 } 1261 1262 static void nfs4_opendata_free(struct kref *kref) 1263 { 1264 struct nfs4_opendata *p = container_of(kref, 1265 struct nfs4_opendata, kref); 1266 struct super_block *sb = p->dentry->d_sb; 1267 1268 nfs_free_seqid(p->o_arg.seqid); 1269 nfs4_sequence_free_slot(&p->o_res.seq_res); 1270 if (p->state != NULL) 1271 nfs4_put_open_state(p->state); 1272 nfs4_put_state_owner(p->owner); 1273 1274 nfs4_label_free(p->a_label); 1275 nfs4_label_free(p->f_label); 1276 1277 dput(p->dir); 1278 dput(p->dentry); 1279 nfs_sb_deactive(sb); 1280 nfs_fattr_free_names(&p->f_attr); 1281 kfree(p->f_attr.mdsthreshold); 1282 kfree(p); 1283 } 1284 1285 static void nfs4_opendata_put(struct nfs4_opendata *p) 1286 { 1287 if (p != NULL) 1288 kref_put(&p->kref, nfs4_opendata_free); 1289 } 1290 1291 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1292 fmode_t fmode) 1293 { 1294 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1295 case FMODE_READ|FMODE_WRITE: 1296 return state->n_rdwr != 0; 1297 case FMODE_WRITE: 1298 return state->n_wronly != 0; 1299 case FMODE_READ: 1300 return state->n_rdonly != 0; 1301 } 1302 WARN_ON_ONCE(1); 1303 return false; 1304 } 1305 1306 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1307 { 1308 int ret = 0; 1309 1310 if (open_mode & (O_EXCL|O_TRUNC)) 1311 goto out; 1312 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1313 case FMODE_READ: 1314 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1315 && state->n_rdonly != 0; 1316 break; 1317 case FMODE_WRITE: 1318 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1319 && state->n_wronly != 0; 1320 break; 1321 case FMODE_READ|FMODE_WRITE: 1322 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1323 && state->n_rdwr != 0; 1324 } 1325 out: 1326 return ret; 1327 } 1328 1329 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1330 enum open_claim_type4 claim) 1331 { 1332 if (delegation == NULL) 1333 return 0; 1334 if ((delegation->type & fmode) != fmode) 1335 return 0; 1336 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1337 return 0; 1338 switch (claim) { 1339 case NFS4_OPEN_CLAIM_NULL: 1340 case NFS4_OPEN_CLAIM_FH: 1341 break; 1342 case NFS4_OPEN_CLAIM_PREVIOUS: 1343 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1344 break; 1345 default: 1346 return 0; 1347 } 1348 nfs_mark_delegation_referenced(delegation); 1349 return 1; 1350 } 1351 1352 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1353 { 1354 switch (fmode) { 1355 case FMODE_WRITE: 1356 state->n_wronly++; 1357 break; 1358 case FMODE_READ: 1359 state->n_rdonly++; 1360 break; 1361 case FMODE_READ|FMODE_WRITE: 1362 state->n_rdwr++; 1363 } 1364 nfs4_state_set_mode_locked(state, state->state | fmode); 1365 } 1366 1367 #ifdef CONFIG_NFS_V4_1 1368 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1369 { 1370 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1371 return true; 1372 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1373 return true; 1374 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1375 return true; 1376 return false; 1377 } 1378 #endif /* CONFIG_NFS_V4_1 */ 1379 1380 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1381 { 1382 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1383 wake_up_all(&state->waitq); 1384 } 1385 1386 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state, 1387 const nfs4_stateid *stateid) 1388 { 1389 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid); 1390 u32 stateid_seqid = be32_to_cpu(stateid->seqid); 1391 1392 if (stateid_seqid == state_seqid + 1U || 1393 (stateid_seqid == 1U && state_seqid == 0xffffffffU)) 1394 nfs_state_log_update_open_stateid(state); 1395 else 1396 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1397 } 1398 1399 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1400 { 1401 struct nfs_client *clp = state->owner->so_server->nfs_client; 1402 bool need_recover = false; 1403 1404 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1405 need_recover = true; 1406 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1407 need_recover = true; 1408 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1409 need_recover = true; 1410 if (need_recover) 1411 nfs4_state_mark_reclaim_nograce(clp, state); 1412 } 1413 1414 /* 1415 * Check for whether or not the caller may update the open stateid 1416 * to the value passed in by stateid. 1417 * 1418 * Note: This function relies heavily on the server implementing 1419 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1420 * correctly. 1421 * i.e. The stateid seqids have to be initialised to 1, and 1422 * are then incremented on every state transition. 1423 */ 1424 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1425 const nfs4_stateid *stateid) 1426 { 1427 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 || 1428 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1429 if (stateid->seqid == cpu_to_be32(1)) 1430 nfs_state_log_update_open_stateid(state); 1431 else 1432 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1433 return true; 1434 } 1435 1436 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1437 nfs_state_log_out_of_order_open_stateid(state, stateid); 1438 return true; 1439 } 1440 return false; 1441 } 1442 1443 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1444 { 1445 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1446 return; 1447 if (state->n_wronly) 1448 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1449 if (state->n_rdonly) 1450 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1451 if (state->n_rdwr) 1452 set_bit(NFS_O_RDWR_STATE, &state->flags); 1453 set_bit(NFS_OPEN_STATE, &state->flags); 1454 } 1455 1456 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1457 nfs4_stateid *stateid, fmode_t fmode) 1458 { 1459 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1460 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1461 case FMODE_WRITE: 1462 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1463 break; 1464 case FMODE_READ: 1465 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1466 break; 1467 case 0: 1468 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1469 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1470 clear_bit(NFS_OPEN_STATE, &state->flags); 1471 } 1472 if (stateid == NULL) 1473 return; 1474 /* Handle OPEN+OPEN_DOWNGRADE races */ 1475 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1476 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1477 nfs_resync_open_stateid_locked(state); 1478 goto out; 1479 } 1480 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1481 nfs4_stateid_copy(&state->stateid, stateid); 1482 nfs4_stateid_copy(&state->open_stateid, stateid); 1483 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1484 out: 1485 nfs_state_log_update_open_stateid(state); 1486 } 1487 1488 static void nfs_clear_open_stateid(struct nfs4_state *state, 1489 nfs4_stateid *arg_stateid, 1490 nfs4_stateid *stateid, fmode_t fmode) 1491 { 1492 write_seqlock(&state->seqlock); 1493 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1494 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1495 nfs_clear_open_stateid_locked(state, stateid, fmode); 1496 write_sequnlock(&state->seqlock); 1497 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1498 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1499 } 1500 1501 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1502 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1503 { 1504 DEFINE_WAIT(wait); 1505 int status = 0; 1506 for (;;) { 1507 1508 if (!nfs_need_update_open_stateid(state, stateid)) 1509 return; 1510 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1511 break; 1512 if (status) 1513 break; 1514 /* Rely on seqids for serialisation with NFSv4.0 */ 1515 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1516 break; 1517 1518 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1519 /* 1520 * Ensure we process the state changes in the same order 1521 * in which the server processed them by delaying the 1522 * update of the stateid until we are in sequence. 1523 */ 1524 write_sequnlock(&state->seqlock); 1525 spin_unlock(&state->owner->so_lock); 1526 rcu_read_unlock(); 1527 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1528 if (!signal_pending(current)) { 1529 if (schedule_timeout(5*HZ) == 0) 1530 status = -EAGAIN; 1531 else 1532 status = 0; 1533 } else 1534 status = -EINTR; 1535 finish_wait(&state->waitq, &wait); 1536 rcu_read_lock(); 1537 spin_lock(&state->owner->so_lock); 1538 write_seqlock(&state->seqlock); 1539 } 1540 1541 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1542 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1543 nfs4_stateid_copy(freeme, &state->open_stateid); 1544 nfs_test_and_clear_all_open_stateid(state); 1545 } 1546 1547 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1548 nfs4_stateid_copy(&state->stateid, stateid); 1549 nfs4_stateid_copy(&state->open_stateid, stateid); 1550 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1551 nfs_state_log_update_open_stateid(state); 1552 } 1553 1554 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1555 const nfs4_stateid *open_stateid, 1556 fmode_t fmode, 1557 nfs4_stateid *freeme) 1558 { 1559 /* 1560 * Protect the call to nfs4_state_set_mode_locked and 1561 * serialise the stateid update 1562 */ 1563 write_seqlock(&state->seqlock); 1564 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1565 switch (fmode) { 1566 case FMODE_READ: 1567 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1568 break; 1569 case FMODE_WRITE: 1570 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1571 break; 1572 case FMODE_READ|FMODE_WRITE: 1573 set_bit(NFS_O_RDWR_STATE, &state->flags); 1574 } 1575 set_bit(NFS_OPEN_STATE, &state->flags); 1576 write_sequnlock(&state->seqlock); 1577 } 1578 1579 static void nfs_state_set_delegation(struct nfs4_state *state, 1580 const nfs4_stateid *deleg_stateid, 1581 fmode_t fmode) 1582 { 1583 /* 1584 * Protect the call to nfs4_state_set_mode_locked and 1585 * serialise the stateid update 1586 */ 1587 write_seqlock(&state->seqlock); 1588 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1589 set_bit(NFS_DELEGATED_STATE, &state->flags); 1590 write_sequnlock(&state->seqlock); 1591 } 1592 1593 static int update_open_stateid(struct nfs4_state *state, 1594 const nfs4_stateid *open_stateid, 1595 const nfs4_stateid *delegation, 1596 fmode_t fmode) 1597 { 1598 struct nfs_server *server = NFS_SERVER(state->inode); 1599 struct nfs_client *clp = server->nfs_client; 1600 struct nfs_inode *nfsi = NFS_I(state->inode); 1601 struct nfs_delegation *deleg_cur; 1602 nfs4_stateid freeme = { }; 1603 int ret = 0; 1604 1605 fmode &= (FMODE_READ|FMODE_WRITE); 1606 1607 rcu_read_lock(); 1608 spin_lock(&state->owner->so_lock); 1609 if (open_stateid != NULL) { 1610 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1611 ret = 1; 1612 } 1613 1614 deleg_cur = rcu_dereference(nfsi->delegation); 1615 if (deleg_cur == NULL) 1616 goto no_delegation; 1617 1618 spin_lock(&deleg_cur->lock); 1619 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1620 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1621 (deleg_cur->type & fmode) != fmode) 1622 goto no_delegation_unlock; 1623 1624 if (delegation == NULL) 1625 delegation = &deleg_cur->stateid; 1626 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1627 goto no_delegation_unlock; 1628 1629 nfs_mark_delegation_referenced(deleg_cur); 1630 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1631 ret = 1; 1632 no_delegation_unlock: 1633 spin_unlock(&deleg_cur->lock); 1634 no_delegation: 1635 if (ret) 1636 update_open_stateflags(state, fmode); 1637 spin_unlock(&state->owner->so_lock); 1638 rcu_read_unlock(); 1639 1640 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1641 nfs4_schedule_state_manager(clp); 1642 if (freeme.type != 0) 1643 nfs4_test_and_free_stateid(server, &freeme, 1644 state->owner->so_cred); 1645 1646 return ret; 1647 } 1648 1649 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1650 const nfs4_stateid *stateid) 1651 { 1652 struct nfs4_state *state = lsp->ls_state; 1653 bool ret = false; 1654 1655 spin_lock(&state->state_lock); 1656 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1657 goto out_noupdate; 1658 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1659 goto out_noupdate; 1660 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1661 ret = true; 1662 out_noupdate: 1663 spin_unlock(&state->state_lock); 1664 return ret; 1665 } 1666 1667 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1668 { 1669 struct nfs_delegation *delegation; 1670 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); 1755 else 1756 nfs_inode_reclaim_delegation(state->inode, 1757 data->owner->so_cred, 1758 &data->o_res); 1759 } 1760 1761 /* 1762 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1763 * and update the nfs4_state. 1764 */ 1765 static struct nfs4_state * 1766 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1767 { 1768 struct inode *inode = data->state->inode; 1769 struct nfs4_state *state = data->state; 1770 int ret; 1771 1772 if (!data->rpc_done) { 1773 if (data->rpc_status) 1774 return ERR_PTR(data->rpc_status); 1775 /* cached opens have already been processed */ 1776 goto update; 1777 } 1778 1779 ret = nfs_refresh_inode(inode, &data->f_attr); 1780 if (ret) 1781 return ERR_PTR(ret); 1782 1783 if (data->o_res.delegation_type != 0) 1784 nfs4_opendata_check_deleg(data, state); 1785 update: 1786 update_open_stateid(state, &data->o_res.stateid, NULL, 1787 data->o_arg.fmode); 1788 atomic_inc(&state->count); 1789 1790 return state; 1791 } 1792 1793 static struct inode * 1794 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1795 { 1796 struct inode *inode; 1797 1798 switch (data->o_arg.claim) { 1799 case NFS4_OPEN_CLAIM_NULL: 1800 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1801 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1802 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1803 return ERR_PTR(-EAGAIN); 1804 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 1805 &data->f_attr, data->f_label); 1806 break; 1807 default: 1808 inode = d_inode(data->dentry); 1809 ihold(inode); 1810 nfs_refresh_inode(inode, &data->f_attr); 1811 } 1812 return inode; 1813 } 1814 1815 static struct nfs4_state * 1816 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 1817 { 1818 struct nfs4_state *state; 1819 struct inode *inode; 1820 1821 inode = nfs4_opendata_get_inode(data); 1822 if (IS_ERR(inode)) 1823 return ERR_CAST(inode); 1824 if (data->state != NULL && data->state->inode == inode) { 1825 state = data->state; 1826 atomic_inc(&state->count); 1827 } else 1828 state = nfs4_get_open_state(inode, data->owner); 1829 iput(inode); 1830 if (state == NULL) 1831 state = ERR_PTR(-ENOMEM); 1832 return state; 1833 } 1834 1835 static struct nfs4_state * 1836 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1837 { 1838 struct nfs4_state *state; 1839 1840 if (!data->rpc_done) { 1841 state = nfs4_try_open_cached(data); 1842 trace_nfs4_cached_open(data->state); 1843 goto out; 1844 } 1845 1846 state = nfs4_opendata_find_nfs4_state(data); 1847 if (IS_ERR(state)) 1848 goto out; 1849 1850 if (data->o_res.delegation_type != 0) 1851 nfs4_opendata_check_deleg(data, state); 1852 update_open_stateid(state, &data->o_res.stateid, NULL, 1853 data->o_arg.fmode); 1854 out: 1855 nfs_release_seqid(data->o_arg.seqid); 1856 return state; 1857 } 1858 1859 static struct nfs4_state * 1860 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1861 { 1862 struct nfs4_state *ret; 1863 1864 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1865 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 1866 else 1867 ret = _nfs4_opendata_to_nfs4_state(data); 1868 nfs4_sequence_free_slot(&data->o_res.seq_res); 1869 return ret; 1870 } 1871 1872 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1873 { 1874 struct nfs_inode *nfsi = NFS_I(state->inode); 1875 struct nfs_open_context *ctx; 1876 1877 spin_lock(&state->inode->i_lock); 1878 list_for_each_entry(ctx, &nfsi->open_files, list) { 1879 if (ctx->state != state) 1880 continue; 1881 get_nfs_open_context(ctx); 1882 spin_unlock(&state->inode->i_lock); 1883 return ctx; 1884 } 1885 spin_unlock(&state->inode->i_lock); 1886 return ERR_PTR(-ENOENT); 1887 } 1888 1889 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1890 struct nfs4_state *state, enum open_claim_type4 claim) 1891 { 1892 struct nfs4_opendata *opendata; 1893 1894 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1895 NULL, claim, GFP_NOFS); 1896 if (opendata == NULL) 1897 return ERR_PTR(-ENOMEM); 1898 opendata->state = state; 1899 atomic_inc(&state->count); 1900 return opendata; 1901 } 1902 1903 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 1904 fmode_t fmode) 1905 { 1906 struct nfs4_state *newstate; 1907 int ret; 1908 1909 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 1910 return 0; 1911 opendata->o_arg.open_flags = 0; 1912 opendata->o_arg.fmode = fmode; 1913 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 1914 NFS_SB(opendata->dentry->d_sb), 1915 fmode, 0); 1916 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1917 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1918 nfs4_init_opendata_res(opendata); 1919 ret = _nfs4_recover_proc_open(opendata); 1920 if (ret != 0) 1921 return ret; 1922 newstate = nfs4_opendata_to_nfs4_state(opendata); 1923 if (IS_ERR(newstate)) 1924 return PTR_ERR(newstate); 1925 if (newstate != opendata->state) 1926 ret = -ESTALE; 1927 nfs4_close_state(newstate, fmode); 1928 return ret; 1929 } 1930 1931 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1932 { 1933 int ret; 1934 1935 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1936 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1937 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1938 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1939 /* memory barrier prior to reading state->n_* */ 1940 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1941 clear_bit(NFS_OPEN_STATE, &state->flags); 1942 smp_rmb(); 1943 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1944 if (ret != 0) 1945 return ret; 1946 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1947 if (ret != 0) 1948 return ret; 1949 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 1950 if (ret != 0) 1951 return ret; 1952 /* 1953 * We may have performed cached opens for all three recoveries. 1954 * Check if we need to update the current stateid. 1955 */ 1956 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1957 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1958 write_seqlock(&state->seqlock); 1959 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1960 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1961 write_sequnlock(&state->seqlock); 1962 } 1963 return 0; 1964 } 1965 1966 /* 1967 * OPEN_RECLAIM: 1968 * reclaim state on the server after a reboot. 1969 */ 1970 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1971 { 1972 struct nfs_delegation *delegation; 1973 struct nfs4_opendata *opendata; 1974 fmode_t delegation_type = 0; 1975 int status; 1976 1977 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1978 NFS4_OPEN_CLAIM_PREVIOUS); 1979 if (IS_ERR(opendata)) 1980 return PTR_ERR(opendata); 1981 rcu_read_lock(); 1982 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1983 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1984 delegation_type = delegation->type; 1985 rcu_read_unlock(); 1986 opendata->o_arg.u.delegation_type = delegation_type; 1987 status = nfs4_open_recover(opendata, state); 1988 nfs4_opendata_put(opendata); 1989 return status; 1990 } 1991 1992 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1993 { 1994 struct nfs_server *server = NFS_SERVER(state->inode); 1995 struct nfs4_exception exception = { }; 1996 int err; 1997 do { 1998 err = _nfs4_do_open_reclaim(ctx, state); 1999 trace_nfs4_open_reclaim(ctx, 0, err); 2000 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2001 continue; 2002 if (err != -NFS4ERR_DELAY) 2003 break; 2004 nfs4_handle_exception(server, err, &exception); 2005 } while (exception.retry); 2006 return err; 2007 } 2008 2009 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2010 { 2011 struct nfs_open_context *ctx; 2012 int ret; 2013 2014 ctx = nfs4_state_find_open_context(state); 2015 if (IS_ERR(ctx)) 2016 return -EAGAIN; 2017 ret = nfs4_do_open_reclaim(ctx, state); 2018 put_nfs_open_context(ctx); 2019 return ret; 2020 } 2021 2022 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err) 2023 { 2024 switch (err) { 2025 default: 2026 printk(KERN_ERR "NFS: %s: unhandled error " 2027 "%d.\n", __func__, err); 2028 case 0: 2029 case -ENOENT: 2030 case -EAGAIN: 2031 case -ESTALE: 2032 break; 2033 case -NFS4ERR_BADSESSION: 2034 case -NFS4ERR_BADSLOT: 2035 case -NFS4ERR_BAD_HIGH_SLOT: 2036 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2037 case -NFS4ERR_DEADSESSION: 2038 set_bit(NFS_DELEGATED_STATE, &state->flags); 2039 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 2040 return -EAGAIN; 2041 case -NFS4ERR_STALE_CLIENTID: 2042 case -NFS4ERR_STALE_STATEID: 2043 set_bit(NFS_DELEGATED_STATE, &state->flags); 2044 /* Don't recall a delegation if it was lost */ 2045 nfs4_schedule_lease_recovery(server->nfs_client); 2046 return -EAGAIN; 2047 case -NFS4ERR_MOVED: 2048 nfs4_schedule_migration_recovery(server); 2049 return -EAGAIN; 2050 case -NFS4ERR_LEASE_MOVED: 2051 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2052 return -EAGAIN; 2053 case -NFS4ERR_DELEG_REVOKED: 2054 case -NFS4ERR_ADMIN_REVOKED: 2055 case -NFS4ERR_EXPIRED: 2056 case -NFS4ERR_BAD_STATEID: 2057 case -NFS4ERR_OPENMODE: 2058 nfs_inode_find_state_and_recover(state->inode, 2059 stateid); 2060 nfs4_schedule_stateid_recovery(server, state); 2061 return -EAGAIN; 2062 case -NFS4ERR_DELAY: 2063 case -NFS4ERR_GRACE: 2064 set_bit(NFS_DELEGATED_STATE, &state->flags); 2065 ssleep(1); 2066 return -EAGAIN; 2067 case -ENOMEM: 2068 case -NFS4ERR_DENIED: 2069 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 2070 return 0; 2071 } 2072 return err; 2073 } 2074 2075 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2076 struct nfs4_state *state, const nfs4_stateid *stateid, 2077 fmode_t type) 2078 { 2079 struct nfs_server *server = NFS_SERVER(state->inode); 2080 struct nfs4_opendata *opendata; 2081 int err = 0; 2082 2083 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2084 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2085 if (IS_ERR(opendata)) 2086 return PTR_ERR(opendata); 2087 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2088 write_seqlock(&state->seqlock); 2089 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2090 write_sequnlock(&state->seqlock); 2091 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2092 switch (type & (FMODE_READ|FMODE_WRITE)) { 2093 case FMODE_READ|FMODE_WRITE: 2094 case FMODE_WRITE: 2095 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2096 if (err) 2097 break; 2098 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2099 if (err) 2100 break; 2101 case FMODE_READ: 2102 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2103 } 2104 nfs4_opendata_put(opendata); 2105 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 2106 } 2107 2108 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2109 { 2110 struct nfs4_opendata *data = calldata; 2111 2112 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2113 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2114 } 2115 2116 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2117 { 2118 struct nfs4_opendata *data = calldata; 2119 2120 nfs40_sequence_done(task, &data->c_res.seq_res); 2121 2122 data->rpc_status = task->tk_status; 2123 if (data->rpc_status == 0) { 2124 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2125 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2126 renew_lease(data->o_res.server, data->timestamp); 2127 data->rpc_done = true; 2128 } 2129 } 2130 2131 static void nfs4_open_confirm_release(void *calldata) 2132 { 2133 struct nfs4_opendata *data = calldata; 2134 struct nfs4_state *state = NULL; 2135 2136 /* If this request hasn't been cancelled, do nothing */ 2137 if (!data->cancelled) 2138 goto out_free; 2139 /* In case of error, no cleanup! */ 2140 if (!data->rpc_done) 2141 goto out_free; 2142 state = nfs4_opendata_to_nfs4_state(data); 2143 if (!IS_ERR(state)) 2144 nfs4_close_state(state, data->o_arg.fmode); 2145 out_free: 2146 nfs4_opendata_put(data); 2147 } 2148 2149 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2150 .rpc_call_prepare = nfs4_open_confirm_prepare, 2151 .rpc_call_done = nfs4_open_confirm_done, 2152 .rpc_release = nfs4_open_confirm_release, 2153 }; 2154 2155 /* 2156 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2157 */ 2158 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2159 { 2160 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2161 struct rpc_task *task; 2162 struct rpc_message msg = { 2163 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2164 .rpc_argp = &data->c_arg, 2165 .rpc_resp = &data->c_res, 2166 .rpc_cred = data->owner->so_cred, 2167 }; 2168 struct rpc_task_setup task_setup_data = { 2169 .rpc_client = server->client, 2170 .rpc_message = &msg, 2171 .callback_ops = &nfs4_open_confirm_ops, 2172 .callback_data = data, 2173 .workqueue = nfsiod_workqueue, 2174 .flags = RPC_TASK_ASYNC, 2175 }; 2176 int status; 2177 2178 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); 2179 kref_get(&data->kref); 2180 data->rpc_done = false; 2181 data->rpc_status = 0; 2182 data->timestamp = jiffies; 2183 if (data->is_recover) 2184 nfs4_set_sequence_privileged(&data->c_arg.seq_args); 2185 task = rpc_run_task(&task_setup_data); 2186 if (IS_ERR(task)) 2187 return PTR_ERR(task); 2188 status = rpc_wait_for_completion_task(task); 2189 if (status != 0) { 2190 data->cancelled = true; 2191 smp_wmb(); 2192 } else 2193 status = data->rpc_status; 2194 rpc_put_task(task); 2195 return status; 2196 } 2197 2198 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2199 { 2200 struct nfs4_opendata *data = calldata; 2201 struct nfs4_state_owner *sp = data->owner; 2202 struct nfs_client *clp = sp->so_server->nfs_client; 2203 enum open_claim_type4 claim = data->o_arg.claim; 2204 2205 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2206 goto out_wait; 2207 /* 2208 * Check if we still need to send an OPEN call, or if we can use 2209 * a delegation instead. 2210 */ 2211 if (data->state != NULL) { 2212 struct nfs_delegation *delegation; 2213 2214 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 2215 goto out_no_action; 2216 rcu_read_lock(); 2217 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 2218 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2219 goto unlock_no_action; 2220 rcu_read_unlock(); 2221 } 2222 /* Update client id. */ 2223 data->o_arg.clientid = clp->cl_clientid; 2224 switch (claim) { 2225 default: 2226 break; 2227 case NFS4_OPEN_CLAIM_PREVIOUS: 2228 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2229 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2230 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2231 case NFS4_OPEN_CLAIM_FH: 2232 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2233 } 2234 data->timestamp = jiffies; 2235 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2236 &data->o_arg.seq_args, 2237 &data->o_res.seq_res, 2238 task) != 0) 2239 nfs_release_seqid(data->o_arg.seqid); 2240 2241 /* Set the create mode (note dependency on the session type) */ 2242 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2243 if (data->o_arg.open_flags & O_EXCL) { 2244 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2245 if (nfs4_has_persistent_session(clp)) 2246 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2247 else if (clp->cl_mvops->minor_version > 0) 2248 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2249 } 2250 return; 2251 unlock_no_action: 2252 trace_nfs4_cached_open(data->state); 2253 rcu_read_unlock(); 2254 out_no_action: 2255 task->tk_action = NULL; 2256 out_wait: 2257 nfs4_sequence_done(task, &data->o_res.seq_res); 2258 } 2259 2260 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2261 { 2262 struct nfs4_opendata *data = calldata; 2263 2264 data->rpc_status = task->tk_status; 2265 2266 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2267 return; 2268 2269 if (task->tk_status == 0) { 2270 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2271 switch (data->o_res.f_attr->mode & S_IFMT) { 2272 case S_IFREG: 2273 break; 2274 case S_IFLNK: 2275 data->rpc_status = -ELOOP; 2276 break; 2277 case S_IFDIR: 2278 data->rpc_status = -EISDIR; 2279 break; 2280 default: 2281 data->rpc_status = -ENOTDIR; 2282 } 2283 } 2284 renew_lease(data->o_res.server, data->timestamp); 2285 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2286 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2287 } 2288 data->rpc_done = true; 2289 } 2290 2291 static void nfs4_open_release(void *calldata) 2292 { 2293 struct nfs4_opendata *data = calldata; 2294 struct nfs4_state *state = NULL; 2295 2296 /* If this request hasn't been cancelled, do nothing */ 2297 if (!data->cancelled) 2298 goto out_free; 2299 /* In case of error, no cleanup! */ 2300 if (data->rpc_status != 0 || !data->rpc_done) 2301 goto out_free; 2302 /* In case we need an open_confirm, no cleanup! */ 2303 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2304 goto out_free; 2305 state = nfs4_opendata_to_nfs4_state(data); 2306 if (!IS_ERR(state)) 2307 nfs4_close_state(state, data->o_arg.fmode); 2308 out_free: 2309 nfs4_opendata_put(data); 2310 } 2311 2312 static const struct rpc_call_ops nfs4_open_ops = { 2313 .rpc_call_prepare = nfs4_open_prepare, 2314 .rpc_call_done = nfs4_open_done, 2315 .rpc_release = nfs4_open_release, 2316 }; 2317 2318 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 2319 { 2320 struct inode *dir = d_inode(data->dir); 2321 struct nfs_server *server = NFS_SERVER(dir); 2322 struct nfs_openargs *o_arg = &data->o_arg; 2323 struct nfs_openres *o_res = &data->o_res; 2324 struct rpc_task *task; 2325 struct rpc_message msg = { 2326 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2327 .rpc_argp = o_arg, 2328 .rpc_resp = o_res, 2329 .rpc_cred = data->owner->so_cred, 2330 }; 2331 struct rpc_task_setup task_setup_data = { 2332 .rpc_client = server->client, 2333 .rpc_message = &msg, 2334 .callback_ops = &nfs4_open_ops, 2335 .callback_data = data, 2336 .workqueue = nfsiod_workqueue, 2337 .flags = RPC_TASK_ASYNC, 2338 }; 2339 int status; 2340 2341 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 2342 kref_get(&data->kref); 2343 data->rpc_done = false; 2344 data->rpc_status = 0; 2345 data->cancelled = false; 2346 data->is_recover = false; 2347 if (isrecover) { 2348 nfs4_set_sequence_privileged(&o_arg->seq_args); 2349 data->is_recover = true; 2350 } 2351 task = rpc_run_task(&task_setup_data); 2352 if (IS_ERR(task)) 2353 return PTR_ERR(task); 2354 status = rpc_wait_for_completion_task(task); 2355 if (status != 0) { 2356 data->cancelled = true; 2357 smp_wmb(); 2358 } else 2359 status = data->rpc_status; 2360 rpc_put_task(task); 2361 2362 return status; 2363 } 2364 2365 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2366 { 2367 struct inode *dir = d_inode(data->dir); 2368 struct nfs_openres *o_res = &data->o_res; 2369 int status; 2370 2371 status = nfs4_run_open_task(data, 1); 2372 if (status != 0 || !data->rpc_done) 2373 return status; 2374 2375 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2376 2377 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2378 status = _nfs4_proc_open_confirm(data); 2379 2380 return status; 2381 } 2382 2383 /* 2384 * Additional permission checks in order to distinguish between an 2385 * open for read, and an open for execute. This works around the 2386 * fact that NFSv4 OPEN treats read and execute permissions as being 2387 * the same. 2388 * Note that in the non-execute case, we want to turn off permission 2389 * checking if we just created a new file (POSIX open() semantics). 2390 */ 2391 static int nfs4_opendata_access(struct rpc_cred *cred, 2392 struct nfs4_opendata *opendata, 2393 struct nfs4_state *state, fmode_t fmode, 2394 int openflags) 2395 { 2396 struct nfs_access_entry cache; 2397 u32 mask, flags; 2398 2399 /* access call failed or for some reason the server doesn't 2400 * support any access modes -- defer access call until later */ 2401 if (opendata->o_res.access_supported == 0) 2402 return 0; 2403 2404 mask = 0; 2405 /* 2406 * Use openflags to check for exec, because fmode won't 2407 * always have FMODE_EXEC set when file open for exec. 2408 */ 2409 if (openflags & __FMODE_EXEC) { 2410 /* ONLY check for exec rights */ 2411 if (S_ISDIR(state->inode->i_mode)) 2412 mask = NFS4_ACCESS_LOOKUP; 2413 else 2414 mask = NFS4_ACCESS_EXECUTE; 2415 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2416 mask = NFS4_ACCESS_READ; 2417 2418 cache.cred = cred; 2419 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2420 nfs_access_add_cache(state->inode, &cache); 2421 2422 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2423 if ((mask & ~cache.mask & flags) == 0) 2424 return 0; 2425 2426 return -EACCES; 2427 } 2428 2429 /* 2430 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2431 */ 2432 static int _nfs4_proc_open(struct nfs4_opendata *data) 2433 { 2434 struct inode *dir = d_inode(data->dir); 2435 struct nfs_server *server = NFS_SERVER(dir); 2436 struct nfs_openargs *o_arg = &data->o_arg; 2437 struct nfs_openres *o_res = &data->o_res; 2438 int status; 2439 2440 status = nfs4_run_open_task(data, 0); 2441 if (!data->rpc_done) 2442 return status; 2443 if (status != 0) { 2444 if (status == -NFS4ERR_BADNAME && 2445 !(o_arg->open_flags & O_CREAT)) 2446 return -ENOENT; 2447 return status; 2448 } 2449 2450 nfs_fattr_map_and_free_names(server, &data->f_attr); 2451 2452 if (o_arg->open_flags & O_CREAT) { 2453 if (o_arg->open_flags & O_EXCL) 2454 data->file_created = true; 2455 else if (o_res->cinfo.before != o_res->cinfo.after) 2456 data->file_created = true; 2457 if (data->file_created || dir->i_version != o_res->cinfo.after) 2458 update_changeattr(dir, &o_res->cinfo, 2459 o_res->f_attr->time_start); 2460 } 2461 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2462 server->caps &= ~NFS_CAP_POSIX_LOCK; 2463 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2464 status = _nfs4_proc_open_confirm(data); 2465 if (status != 0) 2466 return status; 2467 } 2468 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2469 nfs4_sequence_free_slot(&o_res->seq_res); 2470 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2471 } 2472 return 0; 2473 } 2474 2475 /* 2476 * OPEN_EXPIRED: 2477 * reclaim state on the server after a network partition. 2478 * Assumes caller holds the appropriate lock 2479 */ 2480 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2481 { 2482 struct nfs4_opendata *opendata; 2483 int ret; 2484 2485 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2486 NFS4_OPEN_CLAIM_FH); 2487 if (IS_ERR(opendata)) 2488 return PTR_ERR(opendata); 2489 ret = nfs4_open_recover(opendata, state); 2490 if (ret == -ESTALE) 2491 d_drop(ctx->dentry); 2492 nfs4_opendata_put(opendata); 2493 return ret; 2494 } 2495 2496 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2497 { 2498 struct nfs_server *server = NFS_SERVER(state->inode); 2499 struct nfs4_exception exception = { }; 2500 int err; 2501 2502 do { 2503 err = _nfs4_open_expired(ctx, state); 2504 trace_nfs4_open_expired(ctx, 0, err); 2505 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2506 continue; 2507 switch (err) { 2508 default: 2509 goto out; 2510 case -NFS4ERR_GRACE: 2511 case -NFS4ERR_DELAY: 2512 nfs4_handle_exception(server, err, &exception); 2513 err = 0; 2514 } 2515 } while (exception.retry); 2516 out: 2517 return err; 2518 } 2519 2520 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2521 { 2522 struct nfs_open_context *ctx; 2523 int ret; 2524 2525 ctx = nfs4_state_find_open_context(state); 2526 if (IS_ERR(ctx)) 2527 return -EAGAIN; 2528 ret = nfs4_do_open_expired(ctx, state); 2529 put_nfs_open_context(ctx); 2530 return ret; 2531 } 2532 2533 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2534 const nfs4_stateid *stateid) 2535 { 2536 nfs_remove_bad_delegation(state->inode, stateid); 2537 write_seqlock(&state->seqlock); 2538 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2539 write_sequnlock(&state->seqlock); 2540 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2541 } 2542 2543 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2544 { 2545 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2546 nfs_finish_clear_delegation_stateid(state, NULL); 2547 } 2548 2549 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2550 { 2551 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2552 nfs40_clear_delegation_stateid(state); 2553 return nfs4_open_expired(sp, state); 2554 } 2555 2556 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2557 nfs4_stateid *stateid, 2558 struct rpc_cred *cred) 2559 { 2560 return -NFS4ERR_BAD_STATEID; 2561 } 2562 2563 #if defined(CONFIG_NFS_V4_1) 2564 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2565 nfs4_stateid *stateid, 2566 struct rpc_cred *cred) 2567 { 2568 int status; 2569 2570 switch (stateid->type) { 2571 default: 2572 break; 2573 case NFS4_INVALID_STATEID_TYPE: 2574 case NFS4_SPECIAL_STATEID_TYPE: 2575 return -NFS4ERR_BAD_STATEID; 2576 case NFS4_REVOKED_STATEID_TYPE: 2577 goto out_free; 2578 } 2579 2580 status = nfs41_test_stateid(server, stateid, cred); 2581 switch (status) { 2582 case -NFS4ERR_EXPIRED: 2583 case -NFS4ERR_ADMIN_REVOKED: 2584 case -NFS4ERR_DELEG_REVOKED: 2585 break; 2586 default: 2587 return status; 2588 } 2589 out_free: 2590 /* Ack the revoked state to the server */ 2591 nfs41_free_stateid(server, stateid, cred, true); 2592 return -NFS4ERR_EXPIRED; 2593 } 2594 2595 static void nfs41_check_delegation_stateid(struct nfs4_state *state) 2596 { 2597 struct nfs_server *server = NFS_SERVER(state->inode); 2598 nfs4_stateid stateid; 2599 struct nfs_delegation *delegation; 2600 struct rpc_cred *cred; 2601 int status; 2602 2603 /* Get the delegation credential for use by test/free_stateid */ 2604 rcu_read_lock(); 2605 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2606 if (delegation == NULL) { 2607 rcu_read_unlock(); 2608 return; 2609 } 2610 2611 nfs4_stateid_copy(&stateid, &delegation->stateid); 2612 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) || 2613 !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2614 &delegation->flags)) { 2615 rcu_read_unlock(); 2616 nfs_finish_clear_delegation_stateid(state, &stateid); 2617 return; 2618 } 2619 2620 cred = get_rpccred(delegation->cred); 2621 rcu_read_unlock(); 2622 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2623 trace_nfs4_test_delegation_stateid(state, NULL, status); 2624 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2625 nfs_finish_clear_delegation_stateid(state, &stateid); 2626 2627 put_rpccred(cred); 2628 } 2629 2630 /** 2631 * nfs41_check_expired_locks - possibly free a lock stateid 2632 * 2633 * @state: NFSv4 state for an inode 2634 * 2635 * Returns NFS_OK if recovery for this stateid is now finished. 2636 * Otherwise a negative NFS4ERR value is returned. 2637 */ 2638 static int nfs41_check_expired_locks(struct nfs4_state *state) 2639 { 2640 int status, ret = NFS_OK; 2641 struct nfs4_lock_state *lsp, *prev = NULL; 2642 struct nfs_server *server = NFS_SERVER(state->inode); 2643 2644 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2645 goto out; 2646 2647 spin_lock(&state->state_lock); 2648 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2649 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2650 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 2651 2652 refcount_inc(&lsp->ls_count); 2653 spin_unlock(&state->state_lock); 2654 2655 nfs4_put_lock_state(prev); 2656 prev = lsp; 2657 2658 status = nfs41_test_and_free_expired_stateid(server, 2659 &lsp->ls_stateid, 2660 cred); 2661 trace_nfs4_test_lock_stateid(state, lsp, status); 2662 if (status == -NFS4ERR_EXPIRED || 2663 status == -NFS4ERR_BAD_STATEID) { 2664 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2665 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2666 if (!recover_lost_locks) 2667 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2668 } else if (status != NFS_OK) { 2669 ret = status; 2670 nfs4_put_lock_state(prev); 2671 goto out; 2672 } 2673 spin_lock(&state->state_lock); 2674 } 2675 } 2676 spin_unlock(&state->state_lock); 2677 nfs4_put_lock_state(prev); 2678 out: 2679 return ret; 2680 } 2681 2682 /** 2683 * nfs41_check_open_stateid - possibly free an open stateid 2684 * 2685 * @state: NFSv4 state for an inode 2686 * 2687 * Returns NFS_OK if recovery for this stateid is now finished. 2688 * Otherwise a negative NFS4ERR value is returned. 2689 */ 2690 static int nfs41_check_open_stateid(struct nfs4_state *state) 2691 { 2692 struct nfs_server *server = NFS_SERVER(state->inode); 2693 nfs4_stateid *stateid = &state->open_stateid; 2694 struct rpc_cred *cred = state->owner->so_cred; 2695 int status; 2696 2697 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) { 2698 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) { 2699 if (nfs4_have_delegation(state->inode, state->state)) 2700 return NFS_OK; 2701 return -NFS4ERR_OPENMODE; 2702 } 2703 return -NFS4ERR_BAD_STATEID; 2704 } 2705 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2706 trace_nfs4_test_open_stateid(state, NULL, status); 2707 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2708 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2709 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2710 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2711 clear_bit(NFS_OPEN_STATE, &state->flags); 2712 stateid->type = NFS4_INVALID_STATEID_TYPE; 2713 return status; 2714 } 2715 if (nfs_open_stateid_recover_openmode(state)) 2716 return -NFS4ERR_OPENMODE; 2717 return NFS_OK; 2718 } 2719 2720 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2721 { 2722 int status; 2723 2724 nfs41_check_delegation_stateid(state); 2725 status = nfs41_check_expired_locks(state); 2726 if (status != NFS_OK) 2727 return status; 2728 status = nfs41_check_open_stateid(state); 2729 if (status != NFS_OK) 2730 status = nfs4_open_expired(sp, state); 2731 return status; 2732 } 2733 #endif 2734 2735 /* 2736 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2737 * fields corresponding to attributes that were used to store the verifier. 2738 * Make sure we clobber those fields in the later setattr call 2739 */ 2740 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2741 struct iattr *sattr, struct nfs4_label **label) 2742 { 2743 const u32 *attrset = opendata->o_res.attrset; 2744 2745 if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2746 !(sattr->ia_valid & ATTR_ATIME_SET)) 2747 sattr->ia_valid |= ATTR_ATIME; 2748 2749 if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2750 !(sattr->ia_valid & ATTR_MTIME_SET)) 2751 sattr->ia_valid |= ATTR_MTIME; 2752 2753 /* Except MODE, it seems harmless of setting twice. */ 2754 if (opendata->o_arg.createmode != NFS4_CREATE_EXCLUSIVE && 2755 (attrset[1] & FATTR4_WORD1_MODE || 2756 attrset[2] & FATTR4_WORD2_MODE_UMASK)) 2757 sattr->ia_valid &= ~ATTR_MODE; 2758 2759 if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL) 2760 *label = NULL; 2761 } 2762 2763 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2764 fmode_t fmode, 2765 int flags, 2766 struct nfs_open_context *ctx) 2767 { 2768 struct nfs4_state_owner *sp = opendata->owner; 2769 struct nfs_server *server = sp->so_server; 2770 struct dentry *dentry; 2771 struct nfs4_state *state; 2772 unsigned int seq; 2773 int ret; 2774 2775 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2776 2777 ret = _nfs4_proc_open(opendata); 2778 if (ret != 0) 2779 goto out; 2780 2781 state = nfs4_opendata_to_nfs4_state(opendata); 2782 ret = PTR_ERR(state); 2783 if (IS_ERR(state)) 2784 goto out; 2785 ctx->state = state; 2786 if (server->caps & NFS_CAP_POSIX_LOCK) 2787 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2788 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 2789 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 2790 2791 dentry = opendata->dentry; 2792 if (d_really_is_negative(dentry)) { 2793 struct dentry *alias; 2794 d_drop(dentry); 2795 alias = d_exact_alias(dentry, state->inode); 2796 if (!alias) 2797 alias = d_splice_alias(igrab(state->inode), dentry); 2798 /* d_splice_alias() can't fail here - it's a non-directory */ 2799 if (alias) { 2800 dput(ctx->dentry); 2801 ctx->dentry = dentry = alias; 2802 } 2803 nfs_set_verifier(dentry, 2804 nfs_save_change_attribute(d_inode(opendata->dir))); 2805 } 2806 2807 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2808 if (ret != 0) 2809 goto out; 2810 2811 if (d_inode(dentry) == state->inode) { 2812 nfs_inode_attach_open_context(ctx); 2813 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2814 nfs4_schedule_stateid_recovery(server, state); 2815 } 2816 out: 2817 return ret; 2818 } 2819 2820 /* 2821 * Returns a referenced nfs4_state 2822 */ 2823 static int _nfs4_do_open(struct inode *dir, 2824 struct nfs_open_context *ctx, 2825 int flags, 2826 const struct nfs4_open_createattrs *c, 2827 int *opened) 2828 { 2829 struct nfs4_state_owner *sp; 2830 struct nfs4_state *state = NULL; 2831 struct nfs_server *server = NFS_SERVER(dir); 2832 struct nfs4_opendata *opendata; 2833 struct dentry *dentry = ctx->dentry; 2834 struct rpc_cred *cred = ctx->cred; 2835 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2836 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2837 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2838 struct iattr *sattr = c->sattr; 2839 struct nfs4_label *label = c->label; 2840 struct nfs4_label *olabel = NULL; 2841 int status; 2842 2843 /* Protect against reboot recovery conflicts */ 2844 status = -ENOMEM; 2845 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2846 if (sp == NULL) { 2847 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2848 goto out_err; 2849 } 2850 status = nfs4_client_recover_expired_lease(server->nfs_client); 2851 if (status != 0) 2852 goto err_put_state_owner; 2853 if (d_really_is_positive(dentry)) 2854 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 2855 status = -ENOMEM; 2856 if (d_really_is_positive(dentry)) 2857 claim = NFS4_OPEN_CLAIM_FH; 2858 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 2859 c, claim, GFP_KERNEL); 2860 if (opendata == NULL) 2861 goto err_put_state_owner; 2862 2863 if (label) { 2864 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2865 if (IS_ERR(olabel)) { 2866 status = PTR_ERR(olabel); 2867 goto err_opendata_put; 2868 } 2869 } 2870 2871 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2872 if (!opendata->f_attr.mdsthreshold) { 2873 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2874 if (!opendata->f_attr.mdsthreshold) 2875 goto err_free_label; 2876 } 2877 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2878 } 2879 if (d_really_is_positive(dentry)) 2880 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 2881 2882 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2883 if (status != 0) 2884 goto err_free_label; 2885 state = ctx->state; 2886 2887 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 2888 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2889 nfs4_exclusive_attrset(opendata, sattr, &label); 2890 /* 2891 * send create attributes which was not set by open 2892 * with an extra setattr. 2893 */ 2894 if (sattr->ia_valid & NFS4_VALID_ATTRS) { 2895 nfs_fattr_init(opendata->o_res.f_attr); 2896 status = nfs4_do_setattr(state->inode, cred, 2897 opendata->o_res.f_attr, sattr, 2898 ctx, label, olabel); 2899 if (status == 0) { 2900 nfs_setattr_update_inode(state->inode, sattr, 2901 opendata->o_res.f_attr); 2902 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2903 } 2904 } 2905 } 2906 if (opened && opendata->file_created) 2907 *opened |= FILE_CREATED; 2908 2909 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2910 *ctx_th = opendata->f_attr.mdsthreshold; 2911 opendata->f_attr.mdsthreshold = NULL; 2912 } 2913 2914 nfs4_label_free(olabel); 2915 2916 nfs4_opendata_put(opendata); 2917 nfs4_put_state_owner(sp); 2918 return 0; 2919 err_free_label: 2920 nfs4_label_free(olabel); 2921 err_opendata_put: 2922 nfs4_opendata_put(opendata); 2923 err_put_state_owner: 2924 nfs4_put_state_owner(sp); 2925 out_err: 2926 return status; 2927 } 2928 2929 2930 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2931 struct nfs_open_context *ctx, 2932 int flags, 2933 struct iattr *sattr, 2934 struct nfs4_label *label, 2935 int *opened) 2936 { 2937 struct nfs_server *server = NFS_SERVER(dir); 2938 struct nfs4_exception exception = { }; 2939 struct nfs4_state *res; 2940 struct nfs4_open_createattrs c = { 2941 .label = label, 2942 .sattr = sattr, 2943 .verf = { 2944 [0] = (__u32)jiffies, 2945 [1] = (__u32)current->pid, 2946 }, 2947 }; 2948 int status; 2949 2950 do { 2951 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 2952 res = ctx->state; 2953 trace_nfs4_open_file(ctx, flags, status); 2954 if (status == 0) 2955 break; 2956 /* NOTE: BAD_SEQID means the server and client disagree about the 2957 * book-keeping w.r.t. state-changing operations 2958 * (OPEN/CLOSE/LOCK/LOCKU...) 2959 * It is actually a sign of a bug on the client or on the server. 2960 * 2961 * If we receive a BAD_SEQID error in the particular case of 2962 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2963 * have unhashed the old state_owner for us, and that we can 2964 * therefore safely retry using a new one. We should still warn 2965 * the user though... 2966 */ 2967 if (status == -NFS4ERR_BAD_SEQID) { 2968 pr_warn_ratelimited("NFS: v4 server %s " 2969 " returned a bad sequence-id error!\n", 2970 NFS_SERVER(dir)->nfs_client->cl_hostname); 2971 exception.retry = 1; 2972 continue; 2973 } 2974 /* 2975 * BAD_STATEID on OPEN means that the server cancelled our 2976 * state before it received the OPEN_CONFIRM. 2977 * Recover by retrying the request as per the discussion 2978 * on Page 181 of RFC3530. 2979 */ 2980 if (status == -NFS4ERR_BAD_STATEID) { 2981 exception.retry = 1; 2982 continue; 2983 } 2984 if (status == -EAGAIN) { 2985 /* We must have found a delegation */ 2986 exception.retry = 1; 2987 continue; 2988 } 2989 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2990 continue; 2991 res = ERR_PTR(nfs4_handle_exception(server, 2992 status, &exception)); 2993 } while (exception.retry); 2994 return res; 2995 } 2996 2997 static int _nfs4_do_setattr(struct inode *inode, 2998 struct nfs_setattrargs *arg, 2999 struct nfs_setattrres *res, 3000 struct rpc_cred *cred, 3001 struct nfs_open_context *ctx) 3002 { 3003 struct nfs_server *server = NFS_SERVER(inode); 3004 struct rpc_message msg = { 3005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3006 .rpc_argp = arg, 3007 .rpc_resp = res, 3008 .rpc_cred = cred, 3009 }; 3010 struct rpc_cred *delegation_cred = NULL; 3011 unsigned long timestamp = jiffies; 3012 fmode_t fmode; 3013 bool truncate; 3014 int status; 3015 3016 nfs_fattr_init(res->fattr); 3017 3018 /* Servers should only apply open mode checks for file size changes */ 3019 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3020 fmode = truncate ? FMODE_WRITE : FMODE_READ; 3021 3022 if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) { 3023 /* Use that stateid */ 3024 } else if (truncate && ctx != NULL) { 3025 struct nfs_lock_context *l_ctx; 3026 if (!nfs4_valid_open_stateid(ctx->state)) 3027 return -EBADF; 3028 l_ctx = nfs_get_lock_context(ctx); 3029 if (IS_ERR(l_ctx)) 3030 return PTR_ERR(l_ctx); 3031 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3032 &arg->stateid, &delegation_cred); 3033 nfs_put_lock_context(l_ctx); 3034 if (status == -EIO) 3035 return -EBADF; 3036 } else 3037 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3038 if (delegation_cred) 3039 msg.rpc_cred = delegation_cred; 3040 3041 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3042 3043 put_rpccred(delegation_cred); 3044 if (status == 0 && ctx != NULL) 3045 renew_lease(server, timestamp); 3046 trace_nfs4_setattr(inode, &arg->stateid, status); 3047 return status; 3048 } 3049 3050 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 3051 struct nfs_fattr *fattr, struct iattr *sattr, 3052 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 3053 struct nfs4_label *olabel) 3054 { 3055 struct nfs_server *server = NFS_SERVER(inode); 3056 struct nfs4_state *state = ctx ? ctx->state : NULL; 3057 struct nfs_setattrargs arg = { 3058 .fh = NFS_FH(inode), 3059 .iap = sattr, 3060 .server = server, 3061 .bitmask = server->attr_bitmask, 3062 .label = ilabel, 3063 }; 3064 struct nfs_setattrres res = { 3065 .fattr = fattr, 3066 .label = olabel, 3067 .server = server, 3068 }; 3069 struct nfs4_exception exception = { 3070 .state = state, 3071 .inode = inode, 3072 .stateid = &arg.stateid, 3073 }; 3074 int err; 3075 3076 arg.bitmask = nfs4_bitmask(server, ilabel); 3077 if (ilabel) 3078 arg.bitmask = nfs4_bitmask(server, olabel); 3079 3080 do { 3081 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3082 switch (err) { 3083 case -NFS4ERR_OPENMODE: 3084 if (!(sattr->ia_valid & ATTR_SIZE)) { 3085 pr_warn_once("NFSv4: server %s is incorrectly " 3086 "applying open mode checks to " 3087 "a SETATTR that is not " 3088 "changing file size.\n", 3089 server->nfs_client->cl_hostname); 3090 } 3091 if (state && !(state->state & FMODE_WRITE)) { 3092 err = -EBADF; 3093 if (sattr->ia_valid & ATTR_OPEN) 3094 err = -EACCES; 3095 goto out; 3096 } 3097 } 3098 err = nfs4_handle_exception(server, err, &exception); 3099 } while (exception.retry); 3100 out: 3101 return err; 3102 } 3103 3104 static bool 3105 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3106 { 3107 if (inode == NULL || !nfs_have_layout(inode)) 3108 return false; 3109 3110 return pnfs_wait_on_layoutreturn(inode, task); 3111 } 3112 3113 struct nfs4_closedata { 3114 struct inode *inode; 3115 struct nfs4_state *state; 3116 struct nfs_closeargs arg; 3117 struct nfs_closeres res; 3118 struct { 3119 struct nfs4_layoutreturn_args arg; 3120 struct nfs4_layoutreturn_res res; 3121 struct nfs4_xdr_opaque_data ld_private; 3122 u32 roc_barrier; 3123 bool roc; 3124 } lr; 3125 struct nfs_fattr fattr; 3126 unsigned long timestamp; 3127 }; 3128 3129 static void nfs4_free_closedata(void *data) 3130 { 3131 struct nfs4_closedata *calldata = data; 3132 struct nfs4_state_owner *sp = calldata->state->owner; 3133 struct super_block *sb = calldata->state->inode->i_sb; 3134 3135 if (calldata->lr.roc) 3136 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3137 calldata->res.lr_ret); 3138 nfs4_put_open_state(calldata->state); 3139 nfs_free_seqid(calldata->arg.seqid); 3140 nfs4_put_state_owner(sp); 3141 nfs_sb_deactive(sb); 3142 kfree(calldata); 3143 } 3144 3145 static void nfs4_close_done(struct rpc_task *task, void *data) 3146 { 3147 struct nfs4_closedata *calldata = data; 3148 struct nfs4_state *state = calldata->state; 3149 struct nfs_server *server = NFS_SERVER(calldata->inode); 3150 nfs4_stateid *res_stateid = NULL; 3151 3152 dprintk("%s: begin!\n", __func__); 3153 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3154 return; 3155 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3156 3157 /* Handle Layoutreturn errors */ 3158 if (calldata->arg.lr_args && task->tk_status != 0) { 3159 switch (calldata->res.lr_ret) { 3160 default: 3161 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3162 break; 3163 case 0: 3164 calldata->arg.lr_args = NULL; 3165 calldata->res.lr_res = NULL; 3166 break; 3167 case -NFS4ERR_OLD_STATEID: 3168 if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid, 3169 calldata->inode)) 3170 goto lr_restart; 3171 /* Fallthrough */ 3172 case -NFS4ERR_ADMIN_REVOKED: 3173 case -NFS4ERR_DELEG_REVOKED: 3174 case -NFS4ERR_EXPIRED: 3175 case -NFS4ERR_BAD_STATEID: 3176 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 3177 case -NFS4ERR_WRONG_CRED: 3178 calldata->arg.lr_args = NULL; 3179 calldata->res.lr_res = NULL; 3180 goto lr_restart; 3181 } 3182 } 3183 3184 /* hmm. we are done with the inode, and in the process of freeing 3185 * the state_owner. we keep this around to process errors 3186 */ 3187 switch (task->tk_status) { 3188 case 0: 3189 res_stateid = &calldata->res.stateid; 3190 renew_lease(server, calldata->timestamp); 3191 break; 3192 case -NFS4ERR_ACCESS: 3193 if (calldata->arg.bitmask != NULL) { 3194 calldata->arg.bitmask = NULL; 3195 calldata->res.fattr = NULL; 3196 goto out_restart; 3197 3198 } 3199 break; 3200 case -NFS4ERR_OLD_STATEID: 3201 /* Did we race with OPEN? */ 3202 if (nfs4_refresh_open_stateid(&calldata->arg.stateid, 3203 state)) 3204 goto out_restart; 3205 goto out_release; 3206 case -NFS4ERR_ADMIN_REVOKED: 3207 case -NFS4ERR_STALE_STATEID: 3208 case -NFS4ERR_EXPIRED: 3209 nfs4_free_revoked_stateid(server, 3210 &calldata->arg.stateid, 3211 task->tk_msg.rpc_cred); 3212 /* Fallthrough */ 3213 case -NFS4ERR_BAD_STATEID: 3214 break; 3215 default: 3216 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) 3217 goto out_restart; 3218 } 3219 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3220 res_stateid, calldata->arg.fmode); 3221 out_release: 3222 task->tk_status = 0; 3223 nfs_release_seqid(calldata->arg.seqid); 3224 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3225 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 3226 return; 3227 lr_restart: 3228 calldata->res.lr_ret = 0; 3229 out_restart: 3230 task->tk_status = 0; 3231 rpc_restart_call_prepare(task); 3232 goto out_release; 3233 } 3234 3235 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3236 { 3237 struct nfs4_closedata *calldata = data; 3238 struct nfs4_state *state = calldata->state; 3239 struct inode *inode = calldata->inode; 3240 bool is_rdonly, is_wronly, is_rdwr; 3241 int call_close = 0; 3242 3243 dprintk("%s: begin!\n", __func__); 3244 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3245 goto out_wait; 3246 3247 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3248 spin_lock(&state->owner->so_lock); 3249 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3250 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3251 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3252 /* Calculate the change in open mode */ 3253 calldata->arg.fmode = 0; 3254 if (state->n_rdwr == 0) { 3255 if (state->n_rdonly == 0) 3256 call_close |= is_rdonly; 3257 else if (is_rdonly) 3258 calldata->arg.fmode |= FMODE_READ; 3259 if (state->n_wronly == 0) 3260 call_close |= is_wronly; 3261 else if (is_wronly) 3262 calldata->arg.fmode |= FMODE_WRITE; 3263 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3264 call_close |= is_rdwr; 3265 } else if (is_rdwr) 3266 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3267 3268 if (!nfs4_valid_open_stateid(state) || 3269 !nfs4_refresh_open_stateid(&calldata->arg.stateid, state)) 3270 call_close = 0; 3271 spin_unlock(&state->owner->so_lock); 3272 3273 if (!call_close) { 3274 /* Note: exit _without_ calling nfs4_close_done */ 3275 goto out_no_action; 3276 } 3277 3278 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3279 nfs_release_seqid(calldata->arg.seqid); 3280 goto out_wait; 3281 } 3282 3283 if (calldata->arg.fmode == 0) 3284 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3285 3286 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3287 /* Close-to-open cache consistency revalidation */ 3288 if (!nfs4_have_delegation(inode, FMODE_READ)) 3289 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3290 else 3291 calldata->arg.bitmask = NULL; 3292 } 3293 3294 calldata->arg.share_access = 3295 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3296 calldata->arg.fmode, 0); 3297 3298 if (calldata->res.fattr == NULL) 3299 calldata->arg.bitmask = NULL; 3300 else if (calldata->arg.bitmask == NULL) 3301 calldata->res.fattr = NULL; 3302 calldata->timestamp = jiffies; 3303 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3304 &calldata->arg.seq_args, 3305 &calldata->res.seq_res, 3306 task) != 0) 3307 nfs_release_seqid(calldata->arg.seqid); 3308 dprintk("%s: done!\n", __func__); 3309 return; 3310 out_no_action: 3311 task->tk_action = NULL; 3312 out_wait: 3313 nfs4_sequence_done(task, &calldata->res.seq_res); 3314 } 3315 3316 static const struct rpc_call_ops nfs4_close_ops = { 3317 .rpc_call_prepare = nfs4_close_prepare, 3318 .rpc_call_done = nfs4_close_done, 3319 .rpc_release = nfs4_free_closedata, 3320 }; 3321 3322 /* 3323 * It is possible for data to be read/written from a mem-mapped file 3324 * after the sys_close call (which hits the vfs layer as a flush). 3325 * This means that we can't safely call nfsv4 close on a file until 3326 * the inode is cleared. This in turn means that we are not good 3327 * NFSv4 citizens - we do not indicate to the server to update the file's 3328 * share state even when we are done with one of the three share 3329 * stateid's in the inode. 3330 * 3331 * NOTE: Caller must be holding the sp->so_owner semaphore! 3332 */ 3333 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3334 { 3335 struct nfs_server *server = NFS_SERVER(state->inode); 3336 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3337 struct nfs4_closedata *calldata; 3338 struct nfs4_state_owner *sp = state->owner; 3339 struct rpc_task *task; 3340 struct rpc_message msg = { 3341 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3342 .rpc_cred = state->owner->so_cred, 3343 }; 3344 struct rpc_task_setup task_setup_data = { 3345 .rpc_client = server->client, 3346 .rpc_message = &msg, 3347 .callback_ops = &nfs4_close_ops, 3348 .workqueue = nfsiod_workqueue, 3349 .flags = RPC_TASK_ASYNC, 3350 }; 3351 int status = -ENOMEM; 3352 3353 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3354 &task_setup_data.rpc_client, &msg); 3355 3356 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3357 if (calldata == NULL) 3358 goto out; 3359 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 3360 calldata->inode = state->inode; 3361 calldata->state = state; 3362 calldata->arg.fh = NFS_FH(state->inode); 3363 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3364 goto out_free_calldata; 3365 /* Serialization for the sequence id */ 3366 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3367 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3368 if (IS_ERR(calldata->arg.seqid)) 3369 goto out_free_calldata; 3370 nfs_fattr_init(&calldata->fattr); 3371 calldata->arg.fmode = 0; 3372 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3373 calldata->res.fattr = &calldata->fattr; 3374 calldata->res.seqid = calldata->arg.seqid; 3375 calldata->res.server = server; 3376 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3377 calldata->lr.roc = pnfs_roc(state->inode, 3378 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3379 if (calldata->lr.roc) { 3380 calldata->arg.lr_args = &calldata->lr.arg; 3381 calldata->res.lr_res = &calldata->lr.res; 3382 } 3383 nfs_sb_active(calldata->inode->i_sb); 3384 3385 msg.rpc_argp = &calldata->arg; 3386 msg.rpc_resp = &calldata->res; 3387 task_setup_data.callback_data = calldata; 3388 task = rpc_run_task(&task_setup_data); 3389 if (IS_ERR(task)) 3390 return PTR_ERR(task); 3391 status = 0; 3392 if (wait) 3393 status = rpc_wait_for_completion_task(task); 3394 rpc_put_task(task); 3395 return status; 3396 out_free_calldata: 3397 kfree(calldata); 3398 out: 3399 nfs4_put_open_state(state); 3400 nfs4_put_state_owner(sp); 3401 return status; 3402 } 3403 3404 static struct inode * 3405 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3406 int open_flags, struct iattr *attr, int *opened) 3407 { 3408 struct nfs4_state *state; 3409 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3410 3411 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3412 3413 /* Protect against concurrent sillydeletes */ 3414 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3415 3416 nfs4_label_release_security(label); 3417 3418 if (IS_ERR(state)) 3419 return ERR_CAST(state); 3420 return state->inode; 3421 } 3422 3423 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3424 { 3425 if (ctx->state == NULL) 3426 return; 3427 if (is_sync) 3428 nfs4_close_sync(ctx->state, ctx->mode); 3429 else 3430 nfs4_close_state(ctx->state, ctx->mode); 3431 } 3432 3433 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3434 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3435 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL) 3436 3437 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3438 { 3439 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3440 struct nfs4_server_caps_arg args = { 3441 .fhandle = fhandle, 3442 .bitmask = bitmask, 3443 }; 3444 struct nfs4_server_caps_res res = {}; 3445 struct rpc_message msg = { 3446 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3447 .rpc_argp = &args, 3448 .rpc_resp = &res, 3449 }; 3450 int status; 3451 int i; 3452 3453 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3454 FATTR4_WORD0_FH_EXPIRE_TYPE | 3455 FATTR4_WORD0_LINK_SUPPORT | 3456 FATTR4_WORD0_SYMLINK_SUPPORT | 3457 FATTR4_WORD0_ACLSUPPORT; 3458 if (minorversion) 3459 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3460 3461 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3462 if (status == 0) { 3463 /* Sanity check the server answers */ 3464 switch (minorversion) { 3465 case 0: 3466 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3467 res.attr_bitmask[2] = 0; 3468 break; 3469 case 1: 3470 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3471 break; 3472 case 2: 3473 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3474 } 3475 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3476 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3477 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3478 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3479 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3480 NFS_CAP_CTIME|NFS_CAP_MTIME| 3481 NFS_CAP_SECURITY_LABEL); 3482 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3483 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3484 server->caps |= NFS_CAP_ACLS; 3485 if (res.has_links != 0) 3486 server->caps |= NFS_CAP_HARDLINKS; 3487 if (res.has_symlinks != 0) 3488 server->caps |= NFS_CAP_SYMLINKS; 3489 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3490 server->caps |= NFS_CAP_FILEID; 3491 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3492 server->caps |= NFS_CAP_MODE; 3493 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3494 server->caps |= NFS_CAP_NLINK; 3495 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3496 server->caps |= NFS_CAP_OWNER; 3497 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3498 server->caps |= NFS_CAP_OWNER_GROUP; 3499 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3500 server->caps |= NFS_CAP_ATIME; 3501 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3502 server->caps |= NFS_CAP_CTIME; 3503 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3504 server->caps |= NFS_CAP_MTIME; 3505 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3506 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3507 server->caps |= NFS_CAP_SECURITY_LABEL; 3508 #endif 3509 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3510 sizeof(server->attr_bitmask)); 3511 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3512 3513 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3514 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3515 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3516 server->cache_consistency_bitmask[2] = 0; 3517 3518 /* Avoid a regression due to buggy server */ 3519 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3520 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3521 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3522 sizeof(server->exclcreat_bitmask)); 3523 3524 server->acl_bitmask = res.acl_bitmask; 3525 server->fh_expire_type = res.fh_expire_type; 3526 } 3527 3528 return status; 3529 } 3530 3531 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3532 { 3533 struct nfs4_exception exception = { }; 3534 int err; 3535 do { 3536 err = nfs4_handle_exception(server, 3537 _nfs4_server_capabilities(server, fhandle), 3538 &exception); 3539 } while (exception.retry); 3540 return err; 3541 } 3542 3543 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3544 struct nfs_fsinfo *info) 3545 { 3546 u32 bitmask[3]; 3547 struct nfs4_lookup_root_arg args = { 3548 .bitmask = bitmask, 3549 }; 3550 struct nfs4_lookup_res res = { 3551 .server = server, 3552 .fattr = info->fattr, 3553 .fh = fhandle, 3554 }; 3555 struct rpc_message msg = { 3556 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3557 .rpc_argp = &args, 3558 .rpc_resp = &res, 3559 }; 3560 3561 bitmask[0] = nfs4_fattr_bitmap[0]; 3562 bitmask[1] = nfs4_fattr_bitmap[1]; 3563 /* 3564 * Process the label in the upcoming getfattr 3565 */ 3566 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3567 3568 nfs_fattr_init(info->fattr); 3569 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3570 } 3571 3572 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3573 struct nfs_fsinfo *info) 3574 { 3575 struct nfs4_exception exception = { }; 3576 int err; 3577 do { 3578 err = _nfs4_lookup_root(server, fhandle, info); 3579 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3580 switch (err) { 3581 case 0: 3582 case -NFS4ERR_WRONGSEC: 3583 goto out; 3584 default: 3585 err = nfs4_handle_exception(server, err, &exception); 3586 } 3587 } while (exception.retry); 3588 out: 3589 return err; 3590 } 3591 3592 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3593 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3594 { 3595 struct rpc_auth_create_args auth_args = { 3596 .pseudoflavor = flavor, 3597 }; 3598 struct rpc_auth *auth; 3599 3600 auth = rpcauth_create(&auth_args, server->client); 3601 if (IS_ERR(auth)) 3602 return -EACCES; 3603 return nfs4_lookup_root(server, fhandle, info); 3604 } 3605 3606 /* 3607 * Retry pseudoroot lookup with various security flavors. We do this when: 3608 * 3609 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3610 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3611 * 3612 * Returns zero on success, or a negative NFS4ERR value, or a 3613 * negative errno value. 3614 */ 3615 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3616 struct nfs_fsinfo *info) 3617 { 3618 /* Per 3530bis 15.33.5 */ 3619 static const rpc_authflavor_t flav_array[] = { 3620 RPC_AUTH_GSS_KRB5P, 3621 RPC_AUTH_GSS_KRB5I, 3622 RPC_AUTH_GSS_KRB5, 3623 RPC_AUTH_UNIX, /* courtesy */ 3624 RPC_AUTH_NULL, 3625 }; 3626 int status = -EPERM; 3627 size_t i; 3628 3629 if (server->auth_info.flavor_len > 0) { 3630 /* try each flavor specified by user */ 3631 for (i = 0; i < server->auth_info.flavor_len; i++) { 3632 status = nfs4_lookup_root_sec(server, fhandle, info, 3633 server->auth_info.flavors[i]); 3634 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3635 continue; 3636 break; 3637 } 3638 } else { 3639 /* no flavors specified by user, try default list */ 3640 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3641 status = nfs4_lookup_root_sec(server, fhandle, info, 3642 flav_array[i]); 3643 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3644 continue; 3645 break; 3646 } 3647 } 3648 3649 /* 3650 * -EACCESS could mean that the user doesn't have correct permissions 3651 * to access the mount. It could also mean that we tried to mount 3652 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3653 * existing mount programs don't handle -EACCES very well so it should 3654 * be mapped to -EPERM instead. 3655 */ 3656 if (status == -EACCES) 3657 status = -EPERM; 3658 return status; 3659 } 3660 3661 /** 3662 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3663 * @server: initialized nfs_server handle 3664 * @fhandle: we fill in the pseudo-fs root file handle 3665 * @info: we fill in an FSINFO struct 3666 * @auth_probe: probe the auth flavours 3667 * 3668 * Returns zero on success, or a negative errno. 3669 */ 3670 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3671 struct nfs_fsinfo *info, 3672 bool auth_probe) 3673 { 3674 int status = 0; 3675 3676 if (!auth_probe) 3677 status = nfs4_lookup_root(server, fhandle, info); 3678 3679 if (auth_probe || status == NFS4ERR_WRONGSEC) 3680 status = server->nfs_client->cl_mvops->find_root_sec(server, 3681 fhandle, info); 3682 3683 if (status == 0) 3684 status = nfs4_server_capabilities(server, fhandle); 3685 if (status == 0) 3686 status = nfs4_do_fsinfo(server, fhandle, info); 3687 3688 return nfs4_map_errors(status); 3689 } 3690 3691 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3692 struct nfs_fsinfo *info) 3693 { 3694 int error; 3695 struct nfs_fattr *fattr = info->fattr; 3696 struct nfs4_label *label = NULL; 3697 3698 error = nfs4_server_capabilities(server, mntfh); 3699 if (error < 0) { 3700 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3701 return error; 3702 } 3703 3704 label = nfs4_label_alloc(server, GFP_KERNEL); 3705 if (IS_ERR(label)) 3706 return PTR_ERR(label); 3707 3708 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3709 if (error < 0) { 3710 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3711 goto err_free_label; 3712 } 3713 3714 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3715 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3716 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3717 3718 err_free_label: 3719 nfs4_label_free(label); 3720 3721 return error; 3722 } 3723 3724 /* 3725 * Get locations and (maybe) other attributes of a referral. 3726 * Note that we'll actually follow the referral later when 3727 * we detect fsid mismatch in inode revalidation 3728 */ 3729 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3730 const struct qstr *name, struct nfs_fattr *fattr, 3731 struct nfs_fh *fhandle) 3732 { 3733 int status = -ENOMEM; 3734 struct page *page = NULL; 3735 struct nfs4_fs_locations *locations = NULL; 3736 3737 page = alloc_page(GFP_KERNEL); 3738 if (page == NULL) 3739 goto out; 3740 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3741 if (locations == NULL) 3742 goto out; 3743 3744 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3745 if (status != 0) 3746 goto out; 3747 3748 /* 3749 * If the fsid didn't change, this is a migration event, not a 3750 * referral. Cause us to drop into the exception handler, which 3751 * will kick off migration recovery. 3752 */ 3753 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3754 dprintk("%s: server did not return a different fsid for" 3755 " a referral at %s\n", __func__, name->name); 3756 status = -NFS4ERR_MOVED; 3757 goto out; 3758 } 3759 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3760 nfs_fixup_referral_attributes(&locations->fattr); 3761 3762 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3763 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3764 memset(fhandle, 0, sizeof(struct nfs_fh)); 3765 out: 3766 if (page) 3767 __free_page(page); 3768 kfree(locations); 3769 return status; 3770 } 3771 3772 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3773 struct nfs_fattr *fattr, struct nfs4_label *label) 3774 { 3775 struct nfs4_getattr_arg args = { 3776 .fh = fhandle, 3777 .bitmask = server->attr_bitmask, 3778 }; 3779 struct nfs4_getattr_res res = { 3780 .fattr = fattr, 3781 .label = label, 3782 .server = server, 3783 }; 3784 struct rpc_message msg = { 3785 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3786 .rpc_argp = &args, 3787 .rpc_resp = &res, 3788 }; 3789 3790 args.bitmask = nfs4_bitmask(server, label); 3791 3792 nfs_fattr_init(fattr); 3793 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3794 } 3795 3796 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3797 struct nfs_fattr *fattr, struct nfs4_label *label) 3798 { 3799 struct nfs4_exception exception = { }; 3800 int err; 3801 do { 3802 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3803 trace_nfs4_getattr(server, fhandle, fattr, err); 3804 err = nfs4_handle_exception(server, err, 3805 &exception); 3806 } while (exception.retry); 3807 return err; 3808 } 3809 3810 /* 3811 * The file is not closed if it is opened due to the a request to change 3812 * the size of the file. The open call will not be needed once the 3813 * VFS layer lookup-intents are implemented. 3814 * 3815 * Close is called when the inode is destroyed. 3816 * If we haven't opened the file for O_WRONLY, we 3817 * need to in the size_change case to obtain a stateid. 3818 * 3819 * Got race? 3820 * Because OPEN is always done by name in nfsv4, it is 3821 * possible that we opened a different file by the same 3822 * name. We can recognize this race condition, but we 3823 * can't do anything about it besides returning an error. 3824 * 3825 * This will be fixed with VFS changes (lookup-intent). 3826 */ 3827 static int 3828 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3829 struct iattr *sattr) 3830 { 3831 struct inode *inode = d_inode(dentry); 3832 struct rpc_cred *cred = NULL; 3833 struct nfs_open_context *ctx = NULL; 3834 struct nfs4_label *label = NULL; 3835 int status; 3836 3837 if (pnfs_ld_layoutret_on_setattr(inode) && 3838 sattr->ia_valid & ATTR_SIZE && 3839 sattr->ia_size < i_size_read(inode)) 3840 pnfs_commit_and_return_layout(inode); 3841 3842 nfs_fattr_init(fattr); 3843 3844 /* Deal with open(O_TRUNC) */ 3845 if (sattr->ia_valid & ATTR_OPEN) 3846 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3847 3848 /* Optimization: if the end result is no change, don't RPC */ 3849 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3850 return 0; 3851 3852 /* Search for an existing open(O_WRITE) file */ 3853 if (sattr->ia_valid & ATTR_FILE) { 3854 3855 ctx = nfs_file_open_context(sattr->ia_file); 3856 if (ctx) 3857 cred = ctx->cred; 3858 } 3859 3860 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3861 if (IS_ERR(label)) 3862 return PTR_ERR(label); 3863 3864 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label); 3865 if (status == 0) { 3866 nfs_setattr_update_inode(inode, sattr, fattr); 3867 nfs_setsecurity(inode, fattr, label); 3868 } 3869 nfs4_label_free(label); 3870 return status; 3871 } 3872 3873 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3874 const struct qstr *name, struct nfs_fh *fhandle, 3875 struct nfs_fattr *fattr, struct nfs4_label *label) 3876 { 3877 struct nfs_server *server = NFS_SERVER(dir); 3878 int status; 3879 struct nfs4_lookup_arg args = { 3880 .bitmask = server->attr_bitmask, 3881 .dir_fh = NFS_FH(dir), 3882 .name = name, 3883 }; 3884 struct nfs4_lookup_res res = { 3885 .server = server, 3886 .fattr = fattr, 3887 .label = label, 3888 .fh = fhandle, 3889 }; 3890 struct rpc_message msg = { 3891 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3892 .rpc_argp = &args, 3893 .rpc_resp = &res, 3894 }; 3895 3896 args.bitmask = nfs4_bitmask(server, label); 3897 3898 nfs_fattr_init(fattr); 3899 3900 dprintk("NFS call lookup %s\n", name->name); 3901 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3902 dprintk("NFS reply lookup: %d\n", status); 3903 return status; 3904 } 3905 3906 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3907 { 3908 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3909 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3910 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3911 fattr->nlink = 2; 3912 } 3913 3914 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3915 const struct qstr *name, struct nfs_fh *fhandle, 3916 struct nfs_fattr *fattr, struct nfs4_label *label) 3917 { 3918 struct nfs4_exception exception = { }; 3919 struct rpc_clnt *client = *clnt; 3920 int err; 3921 do { 3922 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3923 trace_nfs4_lookup(dir, name, err); 3924 switch (err) { 3925 case -NFS4ERR_BADNAME: 3926 err = -ENOENT; 3927 goto out; 3928 case -NFS4ERR_MOVED: 3929 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3930 if (err == -NFS4ERR_MOVED) 3931 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3932 goto out; 3933 case -NFS4ERR_WRONGSEC: 3934 err = -EPERM; 3935 if (client != *clnt) 3936 goto out; 3937 client = nfs4_negotiate_security(client, dir, name); 3938 if (IS_ERR(client)) 3939 return PTR_ERR(client); 3940 3941 exception.retry = 1; 3942 break; 3943 default: 3944 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3945 } 3946 } while (exception.retry); 3947 3948 out: 3949 if (err == 0) 3950 *clnt = client; 3951 else if (client != *clnt) 3952 rpc_shutdown_client(client); 3953 3954 return err; 3955 } 3956 3957 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 3958 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3959 struct nfs4_label *label) 3960 { 3961 int status; 3962 struct rpc_clnt *client = NFS_CLIENT(dir); 3963 3964 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3965 if (client != NFS_CLIENT(dir)) { 3966 rpc_shutdown_client(client); 3967 nfs_fixup_secinfo_attributes(fattr); 3968 } 3969 return status; 3970 } 3971 3972 struct rpc_clnt * 3973 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name, 3974 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3975 { 3976 struct rpc_clnt *client = NFS_CLIENT(dir); 3977 int status; 3978 3979 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3980 if (status < 0) 3981 return ERR_PTR(status); 3982 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3983 } 3984 3985 static int _nfs4_proc_lookupp(struct inode *inode, 3986 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3987 struct nfs4_label *label) 3988 { 3989 struct rpc_clnt *clnt = NFS_CLIENT(inode); 3990 struct nfs_server *server = NFS_SERVER(inode); 3991 int status; 3992 struct nfs4_lookupp_arg args = { 3993 .bitmask = server->attr_bitmask, 3994 .fh = NFS_FH(inode), 3995 }; 3996 struct nfs4_lookupp_res res = { 3997 .server = server, 3998 .fattr = fattr, 3999 .label = label, 4000 .fh = fhandle, 4001 }; 4002 struct rpc_message msg = { 4003 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4004 .rpc_argp = &args, 4005 .rpc_resp = &res, 4006 }; 4007 4008 args.bitmask = nfs4_bitmask(server, label); 4009 4010 nfs_fattr_init(fattr); 4011 4012 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4013 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4014 &res.seq_res, 0); 4015 dprintk("NFS reply lookupp: %d\n", status); 4016 return status; 4017 } 4018 4019 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4020 struct nfs_fattr *fattr, struct nfs4_label *label) 4021 { 4022 struct nfs4_exception exception = { }; 4023 int err; 4024 do { 4025 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label); 4026 trace_nfs4_lookupp(inode, err); 4027 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4028 &exception); 4029 } while (exception.retry); 4030 return err; 4031 } 4032 4033 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4034 { 4035 struct nfs_server *server = NFS_SERVER(inode); 4036 struct nfs4_accessargs args = { 4037 .fh = NFS_FH(inode), 4038 .bitmask = server->cache_consistency_bitmask, 4039 .access = entry->mask, 4040 }; 4041 struct nfs4_accessres res = { 4042 .server = server, 4043 }; 4044 struct rpc_message msg = { 4045 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4046 .rpc_argp = &args, 4047 .rpc_resp = &res, 4048 .rpc_cred = entry->cred, 4049 }; 4050 int status = 0; 4051 4052 res.fattr = nfs_alloc_fattr(); 4053 if (res.fattr == NULL) 4054 return -ENOMEM; 4055 4056 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4057 if (!status) { 4058 nfs_access_set_mask(entry, res.access); 4059 nfs_refresh_inode(inode, res.fattr); 4060 } 4061 nfs_free_fattr(res.fattr); 4062 return status; 4063 } 4064 4065 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4066 { 4067 struct nfs4_exception exception = { }; 4068 int err; 4069 do { 4070 err = _nfs4_proc_access(inode, entry); 4071 trace_nfs4_access(inode, err); 4072 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4073 &exception); 4074 } while (exception.retry); 4075 return err; 4076 } 4077 4078 /* 4079 * TODO: For the time being, we don't try to get any attributes 4080 * along with any of the zero-copy operations READ, READDIR, 4081 * READLINK, WRITE. 4082 * 4083 * In the case of the first three, we want to put the GETATTR 4084 * after the read-type operation -- this is because it is hard 4085 * to predict the length of a GETATTR response in v4, and thus 4086 * align the READ data correctly. This means that the GETATTR 4087 * may end up partially falling into the page cache, and we should 4088 * shift it into the 'tail' of the xdr_buf before processing. 4089 * To do this efficiently, we need to know the total length 4090 * of data received, which doesn't seem to be available outside 4091 * of the RPC layer. 4092 * 4093 * In the case of WRITE, we also want to put the GETATTR after 4094 * the operation -- in this case because we want to make sure 4095 * we get the post-operation mtime and size. 4096 * 4097 * Both of these changes to the XDR layer would in fact be quite 4098 * minor, but I decided to leave them for a subsequent patch. 4099 */ 4100 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4101 unsigned int pgbase, unsigned int pglen) 4102 { 4103 struct nfs4_readlink args = { 4104 .fh = NFS_FH(inode), 4105 .pgbase = pgbase, 4106 .pglen = pglen, 4107 .pages = &page, 4108 }; 4109 struct nfs4_readlink_res res; 4110 struct rpc_message msg = { 4111 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4112 .rpc_argp = &args, 4113 .rpc_resp = &res, 4114 }; 4115 4116 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4117 } 4118 4119 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4120 unsigned int pgbase, unsigned int pglen) 4121 { 4122 struct nfs4_exception exception = { }; 4123 int err; 4124 do { 4125 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4126 trace_nfs4_readlink(inode, err); 4127 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4128 &exception); 4129 } while (exception.retry); 4130 return err; 4131 } 4132 4133 /* 4134 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4135 */ 4136 static int 4137 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4138 int flags) 4139 { 4140 struct nfs_server *server = NFS_SERVER(dir); 4141 struct nfs4_label l, *ilabel = NULL; 4142 struct nfs_open_context *ctx; 4143 struct nfs4_state *state; 4144 int status = 0; 4145 4146 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4147 if (IS_ERR(ctx)) 4148 return PTR_ERR(ctx); 4149 4150 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4151 4152 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4153 sattr->ia_mode &= ~current_umask(); 4154 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4155 if (IS_ERR(state)) { 4156 status = PTR_ERR(state); 4157 goto out; 4158 } 4159 out: 4160 nfs4_label_release_security(ilabel); 4161 put_nfs_open_context(ctx); 4162 return status; 4163 } 4164 4165 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) 4166 { 4167 struct nfs_server *server = NFS_SERVER(dir); 4168 struct nfs_removeargs args = { 4169 .fh = NFS_FH(dir), 4170 .name = *name, 4171 }; 4172 struct nfs_removeres res = { 4173 .server = server, 4174 }; 4175 struct rpc_message msg = { 4176 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4177 .rpc_argp = &args, 4178 .rpc_resp = &res, 4179 }; 4180 unsigned long timestamp = jiffies; 4181 int status; 4182 4183 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4184 if (status == 0) 4185 update_changeattr(dir, &res.cinfo, timestamp); 4186 return status; 4187 } 4188 4189 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name) 4190 { 4191 struct nfs4_exception exception = { }; 4192 int err; 4193 do { 4194 err = _nfs4_proc_remove(dir, name); 4195 trace_nfs4_remove(dir, name, err); 4196 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4197 &exception); 4198 } while (exception.retry); 4199 return err; 4200 } 4201 4202 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 4203 { 4204 struct nfs_server *server = NFS_SERVER(dir); 4205 struct nfs_removeargs *args = msg->rpc_argp; 4206 struct nfs_removeres *res = msg->rpc_resp; 4207 4208 res->server = server; 4209 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4210 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 4211 4212 nfs_fattr_init(res->dir_attr); 4213 } 4214 4215 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4216 { 4217 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4218 &data->args.seq_args, 4219 &data->res.seq_res, 4220 task); 4221 } 4222 4223 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4224 { 4225 struct nfs_unlinkdata *data = task->tk_calldata; 4226 struct nfs_removeres *res = &data->res; 4227 4228 if (!nfs4_sequence_done(task, &res->seq_res)) 4229 return 0; 4230 if (nfs4_async_handle_error(task, res->server, NULL, 4231 &data->timeout) == -EAGAIN) 4232 return 0; 4233 if (task->tk_status == 0) 4234 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start); 4235 return 1; 4236 } 4237 4238 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 4239 { 4240 struct nfs_server *server = NFS_SERVER(dir); 4241 struct nfs_renameargs *arg = msg->rpc_argp; 4242 struct nfs_renameres *res = msg->rpc_resp; 4243 4244 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4245 res->server = server; 4246 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 4247 } 4248 4249 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4250 { 4251 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4252 &data->args.seq_args, 4253 &data->res.seq_res, 4254 task); 4255 } 4256 4257 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4258 struct inode *new_dir) 4259 { 4260 struct nfs_renamedata *data = task->tk_calldata; 4261 struct nfs_renameres *res = &data->res; 4262 4263 if (!nfs4_sequence_done(task, &res->seq_res)) 4264 return 0; 4265 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4266 return 0; 4267 4268 if (task->tk_status == 0) { 4269 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start); 4270 if (new_dir != old_dir) 4271 update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start); 4272 } 4273 return 1; 4274 } 4275 4276 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4277 { 4278 struct nfs_server *server = NFS_SERVER(inode); 4279 struct nfs4_link_arg arg = { 4280 .fh = NFS_FH(inode), 4281 .dir_fh = NFS_FH(dir), 4282 .name = name, 4283 .bitmask = server->attr_bitmask, 4284 }; 4285 struct nfs4_link_res res = { 4286 .server = server, 4287 .label = NULL, 4288 }; 4289 struct rpc_message msg = { 4290 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4291 .rpc_argp = &arg, 4292 .rpc_resp = &res, 4293 }; 4294 int status = -ENOMEM; 4295 4296 res.fattr = nfs_alloc_fattr(); 4297 if (res.fattr == NULL) 4298 goto out; 4299 4300 res.label = nfs4_label_alloc(server, GFP_KERNEL); 4301 if (IS_ERR(res.label)) { 4302 status = PTR_ERR(res.label); 4303 goto out; 4304 } 4305 arg.bitmask = nfs4_bitmask(server, res.label); 4306 4307 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4308 if (!status) { 4309 update_changeattr(dir, &res.cinfo, res.fattr->time_start); 4310 status = nfs_post_op_update_inode(inode, res.fattr); 4311 if (!status) 4312 nfs_setsecurity(inode, res.fattr, res.label); 4313 } 4314 4315 4316 nfs4_label_free(res.label); 4317 4318 out: 4319 nfs_free_fattr(res.fattr); 4320 return status; 4321 } 4322 4323 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4324 { 4325 struct nfs4_exception exception = { }; 4326 int err; 4327 do { 4328 err = nfs4_handle_exception(NFS_SERVER(inode), 4329 _nfs4_proc_link(inode, dir, name), 4330 &exception); 4331 } while (exception.retry); 4332 return err; 4333 } 4334 4335 struct nfs4_createdata { 4336 struct rpc_message msg; 4337 struct nfs4_create_arg arg; 4338 struct nfs4_create_res res; 4339 struct nfs_fh fh; 4340 struct nfs_fattr fattr; 4341 struct nfs4_label *label; 4342 }; 4343 4344 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4345 const struct qstr *name, struct iattr *sattr, u32 ftype) 4346 { 4347 struct nfs4_createdata *data; 4348 4349 data = kzalloc(sizeof(*data), GFP_KERNEL); 4350 if (data != NULL) { 4351 struct nfs_server *server = NFS_SERVER(dir); 4352 4353 data->label = nfs4_label_alloc(server, GFP_KERNEL); 4354 if (IS_ERR(data->label)) 4355 goto out_free; 4356 4357 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4358 data->msg.rpc_argp = &data->arg; 4359 data->msg.rpc_resp = &data->res; 4360 data->arg.dir_fh = NFS_FH(dir); 4361 data->arg.server = server; 4362 data->arg.name = name; 4363 data->arg.attrs = sattr; 4364 data->arg.ftype = ftype; 4365 data->arg.bitmask = nfs4_bitmask(server, data->label); 4366 data->arg.umask = current_umask(); 4367 data->res.server = server; 4368 data->res.fh = &data->fh; 4369 data->res.fattr = &data->fattr; 4370 data->res.label = data->label; 4371 nfs_fattr_init(data->res.fattr); 4372 } 4373 return data; 4374 out_free: 4375 kfree(data); 4376 return NULL; 4377 } 4378 4379 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4380 { 4381 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4382 &data->arg.seq_args, &data->res.seq_res, 1); 4383 if (status == 0) { 4384 update_changeattr(dir, &data->res.dir_cinfo, 4385 data->res.fattr->time_start); 4386 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 4387 } 4388 return status; 4389 } 4390 4391 static void nfs4_free_createdata(struct nfs4_createdata *data) 4392 { 4393 nfs4_label_free(data->label); 4394 kfree(data); 4395 } 4396 4397 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4398 struct page *page, unsigned int len, struct iattr *sattr, 4399 struct nfs4_label *label) 4400 { 4401 struct nfs4_createdata *data; 4402 int status = -ENAMETOOLONG; 4403 4404 if (len > NFS4_MAXPATHLEN) 4405 goto out; 4406 4407 status = -ENOMEM; 4408 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 4409 if (data == NULL) 4410 goto out; 4411 4412 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 4413 data->arg.u.symlink.pages = &page; 4414 data->arg.u.symlink.len = len; 4415 data->arg.label = label; 4416 4417 status = nfs4_do_create(dir, dentry, data); 4418 4419 nfs4_free_createdata(data); 4420 out: 4421 return status; 4422 } 4423 4424 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4425 struct page *page, unsigned int len, struct iattr *sattr) 4426 { 4427 struct nfs4_exception exception = { }; 4428 struct nfs4_label l, *label = NULL; 4429 int err; 4430 4431 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4432 4433 do { 4434 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4435 trace_nfs4_symlink(dir, &dentry->d_name, err); 4436 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4437 &exception); 4438 } while (exception.retry); 4439 4440 nfs4_label_release_security(label); 4441 return err; 4442 } 4443 4444 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4445 struct iattr *sattr, struct nfs4_label *label) 4446 { 4447 struct nfs4_createdata *data; 4448 int status = -ENOMEM; 4449 4450 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4451 if (data == NULL) 4452 goto out; 4453 4454 data->arg.label = label; 4455 status = nfs4_do_create(dir, dentry, data); 4456 4457 nfs4_free_createdata(data); 4458 out: 4459 return status; 4460 } 4461 4462 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4463 struct iattr *sattr) 4464 { 4465 struct nfs_server *server = NFS_SERVER(dir); 4466 struct nfs4_exception exception = { }; 4467 struct nfs4_label l, *label = NULL; 4468 int err; 4469 4470 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4471 4472 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4473 sattr->ia_mode &= ~current_umask(); 4474 do { 4475 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4476 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4477 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4478 &exception); 4479 } while (exception.retry); 4480 nfs4_label_release_security(label); 4481 4482 return err; 4483 } 4484 4485 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4486 u64 cookie, struct page **pages, unsigned int count, bool plus) 4487 { 4488 struct inode *dir = d_inode(dentry); 4489 struct nfs4_readdir_arg args = { 4490 .fh = NFS_FH(dir), 4491 .pages = pages, 4492 .pgbase = 0, 4493 .count = count, 4494 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4495 .plus = plus, 4496 }; 4497 struct nfs4_readdir_res res; 4498 struct rpc_message msg = { 4499 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4500 .rpc_argp = &args, 4501 .rpc_resp = &res, 4502 .rpc_cred = cred, 4503 }; 4504 int status; 4505 4506 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4507 dentry, 4508 (unsigned long long)cookie); 4509 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4510 res.pgbase = args.pgbase; 4511 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4512 if (status >= 0) { 4513 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4514 status += args.pgbase; 4515 } 4516 4517 nfs_invalidate_atime(dir); 4518 4519 dprintk("%s: returns %d\n", __func__, status); 4520 return status; 4521 } 4522 4523 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4524 u64 cookie, struct page **pages, unsigned int count, bool plus) 4525 { 4526 struct nfs4_exception exception = { }; 4527 int err; 4528 do { 4529 err = _nfs4_proc_readdir(dentry, cred, cookie, 4530 pages, count, plus); 4531 trace_nfs4_readdir(d_inode(dentry), err); 4532 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4533 &exception); 4534 } while (exception.retry); 4535 return err; 4536 } 4537 4538 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4539 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4540 { 4541 struct nfs4_createdata *data; 4542 int mode = sattr->ia_mode; 4543 int status = -ENOMEM; 4544 4545 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4546 if (data == NULL) 4547 goto out; 4548 4549 if (S_ISFIFO(mode)) 4550 data->arg.ftype = NF4FIFO; 4551 else if (S_ISBLK(mode)) { 4552 data->arg.ftype = NF4BLK; 4553 data->arg.u.device.specdata1 = MAJOR(rdev); 4554 data->arg.u.device.specdata2 = MINOR(rdev); 4555 } 4556 else if (S_ISCHR(mode)) { 4557 data->arg.ftype = NF4CHR; 4558 data->arg.u.device.specdata1 = MAJOR(rdev); 4559 data->arg.u.device.specdata2 = MINOR(rdev); 4560 } else if (!S_ISSOCK(mode)) { 4561 status = -EINVAL; 4562 goto out_free; 4563 } 4564 4565 data->arg.label = label; 4566 status = nfs4_do_create(dir, dentry, data); 4567 out_free: 4568 nfs4_free_createdata(data); 4569 out: 4570 return status; 4571 } 4572 4573 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4574 struct iattr *sattr, dev_t rdev) 4575 { 4576 struct nfs_server *server = NFS_SERVER(dir); 4577 struct nfs4_exception exception = { }; 4578 struct nfs4_label l, *label = NULL; 4579 int err; 4580 4581 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4582 4583 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4584 sattr->ia_mode &= ~current_umask(); 4585 do { 4586 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 4587 trace_nfs4_mknod(dir, &dentry->d_name, err); 4588 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4589 &exception); 4590 } while (exception.retry); 4591 4592 nfs4_label_release_security(label); 4593 4594 return err; 4595 } 4596 4597 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 4598 struct nfs_fsstat *fsstat) 4599 { 4600 struct nfs4_statfs_arg args = { 4601 .fh = fhandle, 4602 .bitmask = server->attr_bitmask, 4603 }; 4604 struct nfs4_statfs_res res = { 4605 .fsstat = fsstat, 4606 }; 4607 struct rpc_message msg = { 4608 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 4609 .rpc_argp = &args, 4610 .rpc_resp = &res, 4611 }; 4612 4613 nfs_fattr_init(fsstat->fattr); 4614 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4615 } 4616 4617 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 4618 { 4619 struct nfs4_exception exception = { }; 4620 int err; 4621 do { 4622 err = nfs4_handle_exception(server, 4623 _nfs4_proc_statfs(server, fhandle, fsstat), 4624 &exception); 4625 } while (exception.retry); 4626 return err; 4627 } 4628 4629 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 4630 struct nfs_fsinfo *fsinfo) 4631 { 4632 struct nfs4_fsinfo_arg args = { 4633 .fh = fhandle, 4634 .bitmask = server->attr_bitmask, 4635 }; 4636 struct nfs4_fsinfo_res res = { 4637 .fsinfo = fsinfo, 4638 }; 4639 struct rpc_message msg = { 4640 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 4641 .rpc_argp = &args, 4642 .rpc_resp = &res, 4643 }; 4644 4645 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4646 } 4647 4648 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4649 { 4650 struct nfs4_exception exception = { }; 4651 unsigned long now = jiffies; 4652 int err; 4653 4654 do { 4655 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4656 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4657 if (err == 0) { 4658 nfs4_set_lease_period(server->nfs_client, 4659 fsinfo->lease_time * HZ, 4660 now); 4661 break; 4662 } 4663 err = nfs4_handle_exception(server, err, &exception); 4664 } while (exception.retry); 4665 return err; 4666 } 4667 4668 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4669 { 4670 int error; 4671 4672 nfs_fattr_init(fsinfo->fattr); 4673 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4674 if (error == 0) { 4675 /* block layout checks this! */ 4676 server->pnfs_blksize = fsinfo->blksize; 4677 set_pnfs_layoutdriver(server, fhandle, fsinfo); 4678 } 4679 4680 return error; 4681 } 4682 4683 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4684 struct nfs_pathconf *pathconf) 4685 { 4686 struct nfs4_pathconf_arg args = { 4687 .fh = fhandle, 4688 .bitmask = server->attr_bitmask, 4689 }; 4690 struct nfs4_pathconf_res res = { 4691 .pathconf = pathconf, 4692 }; 4693 struct rpc_message msg = { 4694 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4695 .rpc_argp = &args, 4696 .rpc_resp = &res, 4697 }; 4698 4699 /* None of the pathconf attributes are mandatory to implement */ 4700 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4701 memset(pathconf, 0, sizeof(*pathconf)); 4702 return 0; 4703 } 4704 4705 nfs_fattr_init(pathconf->fattr); 4706 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4707 } 4708 4709 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4710 struct nfs_pathconf *pathconf) 4711 { 4712 struct nfs4_exception exception = { }; 4713 int err; 4714 4715 do { 4716 err = nfs4_handle_exception(server, 4717 _nfs4_proc_pathconf(server, fhandle, pathconf), 4718 &exception); 4719 } while (exception.retry); 4720 return err; 4721 } 4722 4723 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4724 const struct nfs_open_context *ctx, 4725 const struct nfs_lock_context *l_ctx, 4726 fmode_t fmode) 4727 { 4728 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 4729 } 4730 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4731 4732 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4733 const struct nfs_open_context *ctx, 4734 const struct nfs_lock_context *l_ctx, 4735 fmode_t fmode) 4736 { 4737 nfs4_stateid current_stateid; 4738 4739 /* If the current stateid represents a lost lock, then exit */ 4740 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4741 return true; 4742 return nfs4_stateid_match(stateid, ¤t_stateid); 4743 } 4744 4745 static bool nfs4_error_stateid_expired(int err) 4746 { 4747 switch (err) { 4748 case -NFS4ERR_DELEG_REVOKED: 4749 case -NFS4ERR_ADMIN_REVOKED: 4750 case -NFS4ERR_BAD_STATEID: 4751 case -NFS4ERR_STALE_STATEID: 4752 case -NFS4ERR_OLD_STATEID: 4753 case -NFS4ERR_OPENMODE: 4754 case -NFS4ERR_EXPIRED: 4755 return true; 4756 } 4757 return false; 4758 } 4759 4760 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4761 { 4762 struct nfs_server *server = NFS_SERVER(hdr->inode); 4763 4764 trace_nfs4_read(hdr, task->tk_status); 4765 if (task->tk_status < 0) { 4766 struct nfs4_exception exception = { 4767 .inode = hdr->inode, 4768 .state = hdr->args.context->state, 4769 .stateid = &hdr->args.stateid, 4770 }; 4771 task->tk_status = nfs4_async_handle_exception(task, 4772 server, task->tk_status, &exception); 4773 if (exception.retry) { 4774 rpc_restart_call_prepare(task); 4775 return -EAGAIN; 4776 } 4777 } 4778 4779 if (task->tk_status > 0) 4780 renew_lease(server, hdr->timestamp); 4781 return 0; 4782 } 4783 4784 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4785 struct nfs_pgio_args *args) 4786 { 4787 4788 if (!nfs4_error_stateid_expired(task->tk_status) || 4789 nfs4_stateid_is_current(&args->stateid, 4790 args->context, 4791 args->lock_context, 4792 FMODE_READ)) 4793 return false; 4794 rpc_restart_call_prepare(task); 4795 return true; 4796 } 4797 4798 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4799 { 4800 4801 dprintk("--> %s\n", __func__); 4802 4803 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4804 return -EAGAIN; 4805 if (nfs4_read_stateid_changed(task, &hdr->args)) 4806 return -EAGAIN; 4807 if (task->tk_status > 0) 4808 nfs_invalidate_atime(hdr->inode); 4809 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4810 nfs4_read_done_cb(task, hdr); 4811 } 4812 4813 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4814 struct rpc_message *msg) 4815 { 4816 hdr->timestamp = jiffies; 4817 if (!hdr->pgio_done_cb) 4818 hdr->pgio_done_cb = nfs4_read_done_cb; 4819 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4820 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); 4821 } 4822 4823 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4824 struct nfs_pgio_header *hdr) 4825 { 4826 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 4827 &hdr->args.seq_args, 4828 &hdr->res.seq_res, 4829 task)) 4830 return 0; 4831 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4832 hdr->args.lock_context, 4833 hdr->rw_mode) == -EIO) 4834 return -EIO; 4835 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4836 return -EIO; 4837 return 0; 4838 } 4839 4840 static int nfs4_write_done_cb(struct rpc_task *task, 4841 struct nfs_pgio_header *hdr) 4842 { 4843 struct inode *inode = hdr->inode; 4844 4845 trace_nfs4_write(hdr, task->tk_status); 4846 if (task->tk_status < 0) { 4847 struct nfs4_exception exception = { 4848 .inode = hdr->inode, 4849 .state = hdr->args.context->state, 4850 .stateid = &hdr->args.stateid, 4851 }; 4852 task->tk_status = nfs4_async_handle_exception(task, 4853 NFS_SERVER(inode), task->tk_status, 4854 &exception); 4855 if (exception.retry) { 4856 rpc_restart_call_prepare(task); 4857 return -EAGAIN; 4858 } 4859 } 4860 if (task->tk_status >= 0) { 4861 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4862 nfs_writeback_update_inode(hdr); 4863 } 4864 return 0; 4865 } 4866 4867 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4868 struct nfs_pgio_args *args) 4869 { 4870 4871 if (!nfs4_error_stateid_expired(task->tk_status) || 4872 nfs4_stateid_is_current(&args->stateid, 4873 args->context, 4874 args->lock_context, 4875 FMODE_WRITE)) 4876 return false; 4877 rpc_restart_call_prepare(task); 4878 return true; 4879 } 4880 4881 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4882 { 4883 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4884 return -EAGAIN; 4885 if (nfs4_write_stateid_changed(task, &hdr->args)) 4886 return -EAGAIN; 4887 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4888 nfs4_write_done_cb(task, hdr); 4889 } 4890 4891 static 4892 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4893 { 4894 /* Don't request attributes for pNFS or O_DIRECT writes */ 4895 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4896 return false; 4897 /* Otherwise, request attributes if and only if we don't hold 4898 * a delegation 4899 */ 4900 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4901 } 4902 4903 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4904 struct rpc_message *msg) 4905 { 4906 struct nfs_server *server = NFS_SERVER(hdr->inode); 4907 4908 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4909 hdr->args.bitmask = NULL; 4910 hdr->res.fattr = NULL; 4911 } else 4912 hdr->args.bitmask = server->cache_consistency_bitmask; 4913 4914 if (!hdr->pgio_done_cb) 4915 hdr->pgio_done_cb = nfs4_write_done_cb; 4916 hdr->res.server = server; 4917 hdr->timestamp = jiffies; 4918 4919 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4920 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1); 4921 } 4922 4923 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4924 { 4925 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 4926 &data->args.seq_args, 4927 &data->res.seq_res, 4928 task); 4929 } 4930 4931 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4932 { 4933 struct inode *inode = data->inode; 4934 4935 trace_nfs4_commit(data, task->tk_status); 4936 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4937 NULL, NULL) == -EAGAIN) { 4938 rpc_restart_call_prepare(task); 4939 return -EAGAIN; 4940 } 4941 return 0; 4942 } 4943 4944 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4945 { 4946 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4947 return -EAGAIN; 4948 return data->commit_done_cb(task, data); 4949 } 4950 4951 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4952 { 4953 struct nfs_server *server = NFS_SERVER(data->inode); 4954 4955 if (data->commit_done_cb == NULL) 4956 data->commit_done_cb = nfs4_commit_done_cb; 4957 data->res.server = server; 4958 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4959 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4960 } 4961 4962 struct nfs4_renewdata { 4963 struct nfs_client *client; 4964 unsigned long timestamp; 4965 }; 4966 4967 /* 4968 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4969 * standalone procedure for queueing an asynchronous RENEW. 4970 */ 4971 static void nfs4_renew_release(void *calldata) 4972 { 4973 struct nfs4_renewdata *data = calldata; 4974 struct nfs_client *clp = data->client; 4975 4976 if (refcount_read(&clp->cl_count) > 1) 4977 nfs4_schedule_state_renewal(clp); 4978 nfs_put_client(clp); 4979 kfree(data); 4980 } 4981 4982 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4983 { 4984 struct nfs4_renewdata *data = calldata; 4985 struct nfs_client *clp = data->client; 4986 unsigned long timestamp = data->timestamp; 4987 4988 trace_nfs4_renew_async(clp, task->tk_status); 4989 switch (task->tk_status) { 4990 case 0: 4991 break; 4992 case -NFS4ERR_LEASE_MOVED: 4993 nfs4_schedule_lease_moved_recovery(clp); 4994 break; 4995 default: 4996 /* Unless we're shutting down, schedule state recovery! */ 4997 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 4998 return; 4999 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5000 nfs4_schedule_lease_recovery(clp); 5001 return; 5002 } 5003 nfs4_schedule_path_down_recovery(clp); 5004 } 5005 do_renew_lease(clp, timestamp); 5006 } 5007 5008 static const struct rpc_call_ops nfs4_renew_ops = { 5009 .rpc_call_done = nfs4_renew_done, 5010 .rpc_release = nfs4_renew_release, 5011 }; 5012 5013 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 5014 { 5015 struct rpc_message msg = { 5016 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5017 .rpc_argp = clp, 5018 .rpc_cred = cred, 5019 }; 5020 struct nfs4_renewdata *data; 5021 5022 if (renew_flags == 0) 5023 return 0; 5024 if (!refcount_inc_not_zero(&clp->cl_count)) 5025 return -EIO; 5026 data = kmalloc(sizeof(*data), GFP_NOFS); 5027 if (data == NULL) { 5028 nfs_put_client(clp); 5029 return -ENOMEM; 5030 } 5031 data->client = clp; 5032 data->timestamp = jiffies; 5033 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5034 &nfs4_renew_ops, data); 5035 } 5036 5037 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 5038 { 5039 struct rpc_message msg = { 5040 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5041 .rpc_argp = clp, 5042 .rpc_cred = cred, 5043 }; 5044 unsigned long now = jiffies; 5045 int status; 5046 5047 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5048 if (status < 0) 5049 return status; 5050 do_renew_lease(clp, now); 5051 return 0; 5052 } 5053 5054 static inline int nfs4_server_supports_acls(struct nfs_server *server) 5055 { 5056 return server->caps & NFS_CAP_ACLS; 5057 } 5058 5059 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5060 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5061 * the stack. 5062 */ 5063 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5064 5065 static int buf_to_pages_noslab(const void *buf, size_t buflen, 5066 struct page **pages) 5067 { 5068 struct page *newpage, **spages; 5069 int rc = 0; 5070 size_t len; 5071 spages = pages; 5072 5073 do { 5074 len = min_t(size_t, PAGE_SIZE, buflen); 5075 newpage = alloc_page(GFP_KERNEL); 5076 5077 if (newpage == NULL) 5078 goto unwind; 5079 memcpy(page_address(newpage), buf, len); 5080 buf += len; 5081 buflen -= len; 5082 *pages++ = newpage; 5083 rc++; 5084 } while (buflen != 0); 5085 5086 return rc; 5087 5088 unwind: 5089 for(; rc > 0; rc--) 5090 __free_page(spages[rc-1]); 5091 return -ENOMEM; 5092 } 5093 5094 struct nfs4_cached_acl { 5095 int cached; 5096 size_t len; 5097 char data[0]; 5098 }; 5099 5100 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5101 { 5102 struct nfs_inode *nfsi = NFS_I(inode); 5103 5104 spin_lock(&inode->i_lock); 5105 kfree(nfsi->nfs4_acl); 5106 nfsi->nfs4_acl = acl; 5107 spin_unlock(&inode->i_lock); 5108 } 5109 5110 static void nfs4_zap_acl_attr(struct inode *inode) 5111 { 5112 nfs4_set_cached_acl(inode, NULL); 5113 } 5114 5115 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 5116 { 5117 struct nfs_inode *nfsi = NFS_I(inode); 5118 struct nfs4_cached_acl *acl; 5119 int ret = -ENOENT; 5120 5121 spin_lock(&inode->i_lock); 5122 acl = nfsi->nfs4_acl; 5123 if (acl == NULL) 5124 goto out; 5125 if (buf == NULL) /* user is just asking for length */ 5126 goto out_len; 5127 if (acl->cached == 0) 5128 goto out; 5129 ret = -ERANGE; /* see getxattr(2) man page */ 5130 if (acl->len > buflen) 5131 goto out; 5132 memcpy(buf, acl->data, acl->len); 5133 out_len: 5134 ret = acl->len; 5135 out: 5136 spin_unlock(&inode->i_lock); 5137 return ret; 5138 } 5139 5140 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 5141 { 5142 struct nfs4_cached_acl *acl; 5143 size_t buflen = sizeof(*acl) + acl_len; 5144 5145 if (buflen <= PAGE_SIZE) { 5146 acl = kmalloc(buflen, GFP_KERNEL); 5147 if (acl == NULL) 5148 goto out; 5149 acl->cached = 1; 5150 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5151 } else { 5152 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5153 if (acl == NULL) 5154 goto out; 5155 acl->cached = 0; 5156 } 5157 acl->len = acl_len; 5158 out: 5159 nfs4_set_cached_acl(inode, acl); 5160 } 5161 5162 /* 5163 * The getxattr API returns the required buffer length when called with a 5164 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5165 * the required buf. On a NULL buf, we send a page of data to the server 5166 * guessing that the ACL request can be serviced by a page. If so, we cache 5167 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5168 * the cache. If not so, we throw away the page, and cache the required 5169 * length. The next getxattr call will then produce another round trip to 5170 * the server, this time with the input buf of the required size. 5171 */ 5172 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5173 { 5174 struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, }; 5175 struct nfs_getaclargs args = { 5176 .fh = NFS_FH(inode), 5177 .acl_pages = pages, 5178 .acl_len = buflen, 5179 }; 5180 struct nfs_getaclres res = { 5181 .acl_len = buflen, 5182 }; 5183 struct rpc_message msg = { 5184 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5185 .rpc_argp = &args, 5186 .rpc_resp = &res, 5187 }; 5188 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5189 int ret = -ENOMEM, i; 5190 5191 if (npages > ARRAY_SIZE(pages)) 5192 return -ERANGE; 5193 5194 for (i = 0; i < npages; i++) { 5195 pages[i] = alloc_page(GFP_KERNEL); 5196 if (!pages[i]) 5197 goto out_free; 5198 } 5199 5200 /* for decoding across pages */ 5201 res.acl_scratch = alloc_page(GFP_KERNEL); 5202 if (!res.acl_scratch) 5203 goto out_free; 5204 5205 args.acl_len = npages * PAGE_SIZE; 5206 5207 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5208 __func__, buf, buflen, npages, args.acl_len); 5209 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5210 &msg, &args.seq_args, &res.seq_res, 0); 5211 if (ret) 5212 goto out_free; 5213 5214 /* Handle the case where the passed-in buffer is too short */ 5215 if (res.acl_flags & NFS4_ACL_TRUNC) { 5216 /* Did the user only issue a request for the acl length? */ 5217 if (buf == NULL) 5218 goto out_ok; 5219 ret = -ERANGE; 5220 goto out_free; 5221 } 5222 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 5223 if (buf) { 5224 if (res.acl_len > buflen) { 5225 ret = -ERANGE; 5226 goto out_free; 5227 } 5228 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5229 } 5230 out_ok: 5231 ret = res.acl_len; 5232 out_free: 5233 for (i = 0; i < npages; i++) 5234 if (pages[i]) 5235 __free_page(pages[i]); 5236 if (res.acl_scratch) 5237 __free_page(res.acl_scratch); 5238 return ret; 5239 } 5240 5241 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5242 { 5243 struct nfs4_exception exception = { }; 5244 ssize_t ret; 5245 do { 5246 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 5247 trace_nfs4_get_acl(inode, ret); 5248 if (ret >= 0) 5249 break; 5250 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 5251 } while (exception.retry); 5252 return ret; 5253 } 5254 5255 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 5256 { 5257 struct nfs_server *server = NFS_SERVER(inode); 5258 int ret; 5259 5260 if (!nfs4_server_supports_acls(server)) 5261 return -EOPNOTSUPP; 5262 ret = nfs_revalidate_inode(server, inode); 5263 if (ret < 0) 5264 return ret; 5265 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 5266 nfs_zap_acl_cache(inode); 5267 ret = nfs4_read_cached_acl(inode, buf, buflen); 5268 if (ret != -ENOENT) 5269 /* -ENOENT is returned if there is no ACL or if there is an ACL 5270 * but no cached acl data, just the acl length */ 5271 return ret; 5272 return nfs4_get_acl_uncached(inode, buf, buflen); 5273 } 5274 5275 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5276 { 5277 struct nfs_server *server = NFS_SERVER(inode); 5278 struct page *pages[NFS4ACL_MAXPAGES]; 5279 struct nfs_setaclargs arg = { 5280 .fh = NFS_FH(inode), 5281 .acl_pages = pages, 5282 .acl_len = buflen, 5283 }; 5284 struct nfs_setaclres res; 5285 struct rpc_message msg = { 5286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 5287 .rpc_argp = &arg, 5288 .rpc_resp = &res, 5289 }; 5290 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 5291 int ret, i; 5292 5293 if (!nfs4_server_supports_acls(server)) 5294 return -EOPNOTSUPP; 5295 if (npages > ARRAY_SIZE(pages)) 5296 return -ERANGE; 5297 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages); 5298 if (i < 0) 5299 return i; 5300 nfs4_inode_return_delegation(inode); 5301 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5302 5303 /* 5304 * Free each page after tx, so the only ref left is 5305 * held by the network stack 5306 */ 5307 for (; i > 0; i--) 5308 put_page(pages[i-1]); 5309 5310 /* 5311 * Acl update can result in inode attribute update. 5312 * so mark the attribute cache invalid. 5313 */ 5314 spin_lock(&inode->i_lock); 5315 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 5316 spin_unlock(&inode->i_lock); 5317 nfs_access_zap_cache(inode); 5318 nfs_zap_acl_cache(inode); 5319 return ret; 5320 } 5321 5322 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5323 { 5324 struct nfs4_exception exception = { }; 5325 int err; 5326 do { 5327 err = __nfs4_proc_set_acl(inode, buf, buflen); 5328 trace_nfs4_set_acl(inode, err); 5329 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5330 &exception); 5331 } while (exception.retry); 5332 return err; 5333 } 5334 5335 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5336 static int _nfs4_get_security_label(struct inode *inode, void *buf, 5337 size_t buflen) 5338 { 5339 struct nfs_server *server = NFS_SERVER(inode); 5340 struct nfs_fattr fattr; 5341 struct nfs4_label label = {0, 0, buflen, buf}; 5342 5343 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5344 struct nfs4_getattr_arg arg = { 5345 .fh = NFS_FH(inode), 5346 .bitmask = bitmask, 5347 }; 5348 struct nfs4_getattr_res res = { 5349 .fattr = &fattr, 5350 .label = &label, 5351 .server = server, 5352 }; 5353 struct rpc_message msg = { 5354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 5355 .rpc_argp = &arg, 5356 .rpc_resp = &res, 5357 }; 5358 int ret; 5359 5360 nfs_fattr_init(&fattr); 5361 5362 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 5363 if (ret) 5364 return ret; 5365 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 5366 return -ENOENT; 5367 if (buflen < label.len) 5368 return -ERANGE; 5369 return 0; 5370 } 5371 5372 static int nfs4_get_security_label(struct inode *inode, void *buf, 5373 size_t buflen) 5374 { 5375 struct nfs4_exception exception = { }; 5376 int err; 5377 5378 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5379 return -EOPNOTSUPP; 5380 5381 do { 5382 err = _nfs4_get_security_label(inode, buf, buflen); 5383 trace_nfs4_get_security_label(inode, err); 5384 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5385 &exception); 5386 } while (exception.retry); 5387 return err; 5388 } 5389 5390 static int _nfs4_do_set_security_label(struct inode *inode, 5391 struct nfs4_label *ilabel, 5392 struct nfs_fattr *fattr, 5393 struct nfs4_label *olabel) 5394 { 5395 5396 struct iattr sattr = {0}; 5397 struct nfs_server *server = NFS_SERVER(inode); 5398 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5399 struct nfs_setattrargs arg = { 5400 .fh = NFS_FH(inode), 5401 .iap = &sattr, 5402 .server = server, 5403 .bitmask = bitmask, 5404 .label = ilabel, 5405 }; 5406 struct nfs_setattrres res = { 5407 .fattr = fattr, 5408 .label = olabel, 5409 .server = server, 5410 }; 5411 struct rpc_message msg = { 5412 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 5413 .rpc_argp = &arg, 5414 .rpc_resp = &res, 5415 }; 5416 int status; 5417 5418 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 5419 5420 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5421 if (status) 5422 dprintk("%s failed: %d\n", __func__, status); 5423 5424 return status; 5425 } 5426 5427 static int nfs4_do_set_security_label(struct inode *inode, 5428 struct nfs4_label *ilabel, 5429 struct nfs_fattr *fattr, 5430 struct nfs4_label *olabel) 5431 { 5432 struct nfs4_exception exception = { }; 5433 int err; 5434 5435 do { 5436 err = _nfs4_do_set_security_label(inode, ilabel, 5437 fattr, olabel); 5438 trace_nfs4_set_security_label(inode, err); 5439 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5440 &exception); 5441 } while (exception.retry); 5442 return err; 5443 } 5444 5445 static int 5446 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 5447 { 5448 struct nfs4_label ilabel, *olabel = NULL; 5449 struct nfs_fattr fattr; 5450 struct rpc_cred *cred; 5451 int status; 5452 5453 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5454 return -EOPNOTSUPP; 5455 5456 nfs_fattr_init(&fattr); 5457 5458 ilabel.pi = 0; 5459 ilabel.lfs = 0; 5460 ilabel.label = (char *)buf; 5461 ilabel.len = buflen; 5462 5463 cred = rpc_lookup_cred(); 5464 if (IS_ERR(cred)) 5465 return PTR_ERR(cred); 5466 5467 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5468 if (IS_ERR(olabel)) { 5469 status = -PTR_ERR(olabel); 5470 goto out; 5471 } 5472 5473 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5474 if (status == 0) 5475 nfs_setsecurity(inode, &fattr, olabel); 5476 5477 nfs4_label_free(olabel); 5478 out: 5479 put_rpccred(cred); 5480 return status; 5481 } 5482 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5483 5484 5485 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5486 nfs4_verifier *bootverf) 5487 { 5488 __be32 verf[2]; 5489 5490 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5491 /* An impossible timestamp guarantees this value 5492 * will never match a generated boot time. */ 5493 verf[0] = cpu_to_be32(U32_MAX); 5494 verf[1] = cpu_to_be32(U32_MAX); 5495 } else { 5496 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5497 u64 ns = ktime_to_ns(nn->boot_time); 5498 5499 verf[0] = cpu_to_be32(ns >> 32); 5500 verf[1] = cpu_to_be32(ns); 5501 } 5502 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 5503 } 5504 5505 static int 5506 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 5507 { 5508 size_t len; 5509 char *str; 5510 5511 if (clp->cl_owner_id != NULL) 5512 return 0; 5513 5514 rcu_read_lock(); 5515 len = 14 + strlen(clp->cl_ipaddr) + 1 + 5516 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 5517 1 + 5518 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) + 5519 1; 5520 rcu_read_unlock(); 5521 5522 if (len > NFS4_OPAQUE_LIMIT + 1) 5523 return -EINVAL; 5524 5525 /* 5526 * Since this string is allocated at mount time, and held until the 5527 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5528 * about a memory-reclaim deadlock. 5529 */ 5530 str = kmalloc(len, GFP_KERNEL); 5531 if (!str) 5532 return -ENOMEM; 5533 5534 rcu_read_lock(); 5535 scnprintf(str, len, "Linux NFSv4.0 %s/%s %s", 5536 clp->cl_ipaddr, 5537 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), 5538 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)); 5539 rcu_read_unlock(); 5540 5541 clp->cl_owner_id = str; 5542 return 0; 5543 } 5544 5545 static int 5546 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 5547 { 5548 size_t len; 5549 char *str; 5550 5551 len = 10 + 10 + 1 + 10 + 1 + 5552 strlen(nfs4_client_id_uniquifier) + 1 + 5553 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5554 5555 if (len > NFS4_OPAQUE_LIMIT + 1) 5556 return -EINVAL; 5557 5558 /* 5559 * Since this string is allocated at mount time, and held until the 5560 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5561 * about a memory-reclaim deadlock. 5562 */ 5563 str = kmalloc(len, GFP_KERNEL); 5564 if (!str) 5565 return -ENOMEM; 5566 5567 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 5568 clp->rpc_ops->version, clp->cl_minorversion, 5569 nfs4_client_id_uniquifier, 5570 clp->cl_rpcclient->cl_nodename); 5571 clp->cl_owner_id = str; 5572 return 0; 5573 } 5574 5575 static int 5576 nfs4_init_uniform_client_string(struct nfs_client *clp) 5577 { 5578 size_t len; 5579 char *str; 5580 5581 if (clp->cl_owner_id != NULL) 5582 return 0; 5583 5584 if (nfs4_client_id_uniquifier[0] != '\0') 5585 return nfs4_init_uniquifier_client_string(clp); 5586 5587 len = 10 + 10 + 1 + 10 + 1 + 5588 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5589 5590 if (len > NFS4_OPAQUE_LIMIT + 1) 5591 return -EINVAL; 5592 5593 /* 5594 * Since this string is allocated at mount time, and held until the 5595 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5596 * about a memory-reclaim deadlock. 5597 */ 5598 str = kmalloc(len, GFP_KERNEL); 5599 if (!str) 5600 return -ENOMEM; 5601 5602 scnprintf(str, len, "Linux NFSv%u.%u %s", 5603 clp->rpc_ops->version, clp->cl_minorversion, 5604 clp->cl_rpcclient->cl_nodename); 5605 clp->cl_owner_id = str; 5606 return 0; 5607 } 5608 5609 /* 5610 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 5611 * services. Advertise one based on the address family of the 5612 * clientaddr. 5613 */ 5614 static unsigned int 5615 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 5616 { 5617 if (strchr(clp->cl_ipaddr, ':') != NULL) 5618 return scnprintf(buf, len, "tcp6"); 5619 else 5620 return scnprintf(buf, len, "tcp"); 5621 } 5622 5623 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 5624 { 5625 struct nfs4_setclientid *sc = calldata; 5626 5627 if (task->tk_status == 0) 5628 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 5629 } 5630 5631 static const struct rpc_call_ops nfs4_setclientid_ops = { 5632 .rpc_call_done = nfs4_setclientid_done, 5633 }; 5634 5635 /** 5636 * nfs4_proc_setclientid - Negotiate client ID 5637 * @clp: state data structure 5638 * @program: RPC program for NFSv4 callback service 5639 * @port: IP port number for NFS4 callback service 5640 * @cred: RPC credential to use for this call 5641 * @res: where to place the result 5642 * 5643 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5644 */ 5645 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 5646 unsigned short port, struct rpc_cred *cred, 5647 struct nfs4_setclientid_res *res) 5648 { 5649 nfs4_verifier sc_verifier; 5650 struct nfs4_setclientid setclientid = { 5651 .sc_verifier = &sc_verifier, 5652 .sc_prog = program, 5653 .sc_clnt = clp, 5654 }; 5655 struct rpc_message msg = { 5656 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5657 .rpc_argp = &setclientid, 5658 .rpc_resp = res, 5659 .rpc_cred = cred, 5660 }; 5661 struct rpc_task *task; 5662 struct rpc_task_setup task_setup_data = { 5663 .rpc_client = clp->cl_rpcclient, 5664 .rpc_message = &msg, 5665 .callback_ops = &nfs4_setclientid_ops, 5666 .callback_data = &setclientid, 5667 .flags = RPC_TASK_TIMEOUT, 5668 }; 5669 int status; 5670 5671 /* nfs_client_id4 */ 5672 nfs4_init_boot_verifier(clp, &sc_verifier); 5673 5674 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5675 status = nfs4_init_uniform_client_string(clp); 5676 else 5677 status = nfs4_init_nonuniform_client_string(clp); 5678 5679 if (status) 5680 goto out; 5681 5682 /* cb_client4 */ 5683 setclientid.sc_netid_len = 5684 nfs4_init_callback_netid(clp, 5685 setclientid.sc_netid, 5686 sizeof(setclientid.sc_netid)); 5687 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5688 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5689 clp->cl_ipaddr, port >> 8, port & 255); 5690 5691 dprintk("NFS call setclientid auth=%s, '%s'\n", 5692 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5693 clp->cl_owner_id); 5694 task = rpc_run_task(&task_setup_data); 5695 if (IS_ERR(task)) { 5696 status = PTR_ERR(task); 5697 goto out; 5698 } 5699 status = task->tk_status; 5700 if (setclientid.sc_cred) { 5701 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5702 put_rpccred(setclientid.sc_cred); 5703 } 5704 rpc_put_task(task); 5705 out: 5706 trace_nfs4_setclientid(clp, status); 5707 dprintk("NFS reply setclientid: %d\n", status); 5708 return status; 5709 } 5710 5711 /** 5712 * nfs4_proc_setclientid_confirm - Confirm client ID 5713 * @clp: state data structure 5714 * @res: result of a previous SETCLIENTID 5715 * @cred: RPC credential to use for this call 5716 * 5717 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5718 */ 5719 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5720 struct nfs4_setclientid_res *arg, 5721 struct rpc_cred *cred) 5722 { 5723 struct rpc_message msg = { 5724 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5725 .rpc_argp = arg, 5726 .rpc_cred = cred, 5727 }; 5728 int status; 5729 5730 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5731 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5732 clp->cl_clientid); 5733 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5734 trace_nfs4_setclientid_confirm(clp, status); 5735 dprintk("NFS reply setclientid_confirm: %d\n", status); 5736 return status; 5737 } 5738 5739 struct nfs4_delegreturndata { 5740 struct nfs4_delegreturnargs args; 5741 struct nfs4_delegreturnres res; 5742 struct nfs_fh fh; 5743 nfs4_stateid stateid; 5744 unsigned long timestamp; 5745 struct { 5746 struct nfs4_layoutreturn_args arg; 5747 struct nfs4_layoutreturn_res res; 5748 struct nfs4_xdr_opaque_data ld_private; 5749 u32 roc_barrier; 5750 bool roc; 5751 } lr; 5752 struct nfs_fattr fattr; 5753 int rpc_status; 5754 struct inode *inode; 5755 }; 5756 5757 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5758 { 5759 struct nfs4_delegreturndata *data = calldata; 5760 5761 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5762 return; 5763 5764 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5765 5766 /* Handle Layoutreturn errors */ 5767 if (data->args.lr_args && task->tk_status != 0) { 5768 switch(data->res.lr_ret) { 5769 default: 5770 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5771 break; 5772 case 0: 5773 data->args.lr_args = NULL; 5774 data->res.lr_res = NULL; 5775 break; 5776 case -NFS4ERR_OLD_STATEID: 5777 if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid, 5778 data->inode)) 5779 goto lr_restart; 5780 /* Fallthrough */ 5781 case -NFS4ERR_ADMIN_REVOKED: 5782 case -NFS4ERR_DELEG_REVOKED: 5783 case -NFS4ERR_EXPIRED: 5784 case -NFS4ERR_BAD_STATEID: 5785 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 5786 case -NFS4ERR_WRONG_CRED: 5787 data->args.lr_args = NULL; 5788 data->res.lr_res = NULL; 5789 goto lr_restart; 5790 } 5791 } 5792 5793 switch (task->tk_status) { 5794 case 0: 5795 renew_lease(data->res.server, data->timestamp); 5796 break; 5797 case -NFS4ERR_ADMIN_REVOKED: 5798 case -NFS4ERR_DELEG_REVOKED: 5799 case -NFS4ERR_EXPIRED: 5800 nfs4_free_revoked_stateid(data->res.server, 5801 data->args.stateid, 5802 task->tk_msg.rpc_cred); 5803 /* Fallthrough */ 5804 case -NFS4ERR_BAD_STATEID: 5805 case -NFS4ERR_STALE_STATEID: 5806 task->tk_status = 0; 5807 break; 5808 case -NFS4ERR_OLD_STATEID: 5809 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 5810 goto out_restart; 5811 task->tk_status = 0; 5812 break; 5813 case -NFS4ERR_ACCESS: 5814 if (data->args.bitmask) { 5815 data->args.bitmask = NULL; 5816 data->res.fattr = NULL; 5817 goto out_restart; 5818 } 5819 /* Fallthrough */ 5820 default: 5821 if (nfs4_async_handle_error(task, data->res.server, 5822 NULL, NULL) == -EAGAIN) { 5823 goto out_restart; 5824 } 5825 } 5826 data->rpc_status = task->tk_status; 5827 return; 5828 lr_restart: 5829 data->res.lr_ret = 0; 5830 out_restart: 5831 task->tk_status = 0; 5832 rpc_restart_call_prepare(task); 5833 } 5834 5835 static void nfs4_delegreturn_release(void *calldata) 5836 { 5837 struct nfs4_delegreturndata *data = calldata; 5838 struct inode *inode = data->inode; 5839 5840 if (inode) { 5841 if (data->lr.roc) 5842 pnfs_roc_release(&data->lr.arg, &data->lr.res, 5843 data->res.lr_ret); 5844 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5845 nfs_iput_and_deactive(inode); 5846 } 5847 kfree(calldata); 5848 } 5849 5850 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5851 { 5852 struct nfs4_delegreturndata *d_data; 5853 5854 d_data = (struct nfs4_delegreturndata *)data; 5855 5856 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) 5857 return; 5858 5859 nfs4_setup_sequence(d_data->res.server->nfs_client, 5860 &d_data->args.seq_args, 5861 &d_data->res.seq_res, 5862 task); 5863 } 5864 5865 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5866 .rpc_call_prepare = nfs4_delegreturn_prepare, 5867 .rpc_call_done = nfs4_delegreturn_done, 5868 .rpc_release = nfs4_delegreturn_release, 5869 }; 5870 5871 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5872 { 5873 struct nfs4_delegreturndata *data; 5874 struct nfs_server *server = NFS_SERVER(inode); 5875 struct rpc_task *task; 5876 struct rpc_message msg = { 5877 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5878 .rpc_cred = cred, 5879 }; 5880 struct rpc_task_setup task_setup_data = { 5881 .rpc_client = server->client, 5882 .rpc_message = &msg, 5883 .callback_ops = &nfs4_delegreturn_ops, 5884 .flags = RPC_TASK_ASYNC, 5885 }; 5886 int status = 0; 5887 5888 data = kzalloc(sizeof(*data), GFP_NOFS); 5889 if (data == NULL) 5890 return -ENOMEM; 5891 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5892 5893 nfs4_state_protect(server->nfs_client, 5894 NFS_SP4_MACH_CRED_CLEANUP, 5895 &task_setup_data.rpc_client, &msg); 5896 5897 data->args.fhandle = &data->fh; 5898 data->args.stateid = &data->stateid; 5899 data->args.bitmask = server->cache_consistency_bitmask; 5900 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5901 nfs4_stateid_copy(&data->stateid, stateid); 5902 data->res.fattr = &data->fattr; 5903 data->res.server = server; 5904 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5905 data->lr.arg.ld_private = &data->lr.ld_private; 5906 nfs_fattr_init(data->res.fattr); 5907 data->timestamp = jiffies; 5908 data->rpc_status = 0; 5909 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred); 5910 data->inode = nfs_igrab_and_active(inode); 5911 if (data->inode) { 5912 if (data->lr.roc) { 5913 data->args.lr_args = &data->lr.arg; 5914 data->res.lr_res = &data->lr.res; 5915 } 5916 } else if (data->lr.roc) { 5917 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0); 5918 data->lr.roc = false; 5919 } 5920 5921 task_setup_data.callback_data = data; 5922 msg.rpc_argp = &data->args; 5923 msg.rpc_resp = &data->res; 5924 task = rpc_run_task(&task_setup_data); 5925 if (IS_ERR(task)) 5926 return PTR_ERR(task); 5927 if (!issync) 5928 goto out; 5929 status = rpc_wait_for_completion_task(task); 5930 if (status != 0) 5931 goto out; 5932 status = data->rpc_status; 5933 out: 5934 rpc_put_task(task); 5935 return status; 5936 } 5937 5938 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5939 { 5940 struct nfs_server *server = NFS_SERVER(inode); 5941 struct nfs4_exception exception = { }; 5942 int err; 5943 do { 5944 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5945 trace_nfs4_delegreturn(inode, stateid, err); 5946 switch (err) { 5947 case -NFS4ERR_STALE_STATEID: 5948 case -NFS4ERR_EXPIRED: 5949 case 0: 5950 return 0; 5951 } 5952 err = nfs4_handle_exception(server, err, &exception); 5953 } while (exception.retry); 5954 return err; 5955 } 5956 5957 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5958 { 5959 struct inode *inode = state->inode; 5960 struct nfs_server *server = NFS_SERVER(inode); 5961 struct nfs_client *clp = server->nfs_client; 5962 struct nfs_lockt_args arg = { 5963 .fh = NFS_FH(inode), 5964 .fl = request, 5965 }; 5966 struct nfs_lockt_res res = { 5967 .denied = request, 5968 }; 5969 struct rpc_message msg = { 5970 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5971 .rpc_argp = &arg, 5972 .rpc_resp = &res, 5973 .rpc_cred = state->owner->so_cred, 5974 }; 5975 struct nfs4_lock_state *lsp; 5976 int status; 5977 5978 arg.lock_owner.clientid = clp->cl_clientid; 5979 status = nfs4_set_lock_state(state, request); 5980 if (status != 0) 5981 goto out; 5982 lsp = request->fl_u.nfs4_fl.owner; 5983 arg.lock_owner.id = lsp->ls_seqid.owner_id; 5984 arg.lock_owner.s_dev = server->s_dev; 5985 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5986 switch (status) { 5987 case 0: 5988 request->fl_type = F_UNLCK; 5989 break; 5990 case -NFS4ERR_DENIED: 5991 status = 0; 5992 } 5993 request->fl_ops->fl_release_private(request); 5994 request->fl_ops = NULL; 5995 out: 5996 return status; 5997 } 5998 5999 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6000 { 6001 struct nfs4_exception exception = { }; 6002 int err; 6003 6004 do { 6005 err = _nfs4_proc_getlk(state, cmd, request); 6006 trace_nfs4_get_lock(request, state, cmd, err); 6007 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6008 &exception); 6009 } while (exception.retry); 6010 return err; 6011 } 6012 6013 struct nfs4_unlockdata { 6014 struct nfs_locku_args arg; 6015 struct nfs_locku_res res; 6016 struct nfs4_lock_state *lsp; 6017 struct nfs_open_context *ctx; 6018 struct nfs_lock_context *l_ctx; 6019 struct file_lock fl; 6020 struct nfs_server *server; 6021 unsigned long timestamp; 6022 }; 6023 6024 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6025 struct nfs_open_context *ctx, 6026 struct nfs4_lock_state *lsp, 6027 struct nfs_seqid *seqid) 6028 { 6029 struct nfs4_unlockdata *p; 6030 struct inode *inode = lsp->ls_state->inode; 6031 6032 p = kzalloc(sizeof(*p), GFP_NOFS); 6033 if (p == NULL) 6034 return NULL; 6035 p->arg.fh = NFS_FH(inode); 6036 p->arg.fl = &p->fl; 6037 p->arg.seqid = seqid; 6038 p->res.seqid = seqid; 6039 p->lsp = lsp; 6040 refcount_inc(&lsp->ls_count); 6041 /* Ensure we don't close file until we're done freeing locks! */ 6042 p->ctx = get_nfs_open_context(ctx); 6043 p->l_ctx = nfs_get_lock_context(ctx); 6044 memcpy(&p->fl, fl, sizeof(p->fl)); 6045 p->server = NFS_SERVER(inode); 6046 return p; 6047 } 6048 6049 static void nfs4_locku_release_calldata(void *data) 6050 { 6051 struct nfs4_unlockdata *calldata = data; 6052 nfs_free_seqid(calldata->arg.seqid); 6053 nfs4_put_lock_state(calldata->lsp); 6054 nfs_put_lock_context(calldata->l_ctx); 6055 put_nfs_open_context(calldata->ctx); 6056 kfree(calldata); 6057 } 6058 6059 static void nfs4_locku_done(struct rpc_task *task, void *data) 6060 { 6061 struct nfs4_unlockdata *calldata = data; 6062 6063 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6064 return; 6065 switch (task->tk_status) { 6066 case 0: 6067 renew_lease(calldata->server, calldata->timestamp); 6068 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6069 if (nfs4_update_lock_stateid(calldata->lsp, 6070 &calldata->res.stateid)) 6071 break; 6072 case -NFS4ERR_ADMIN_REVOKED: 6073 case -NFS4ERR_EXPIRED: 6074 nfs4_free_revoked_stateid(calldata->server, 6075 &calldata->arg.stateid, 6076 task->tk_msg.rpc_cred); 6077 case -NFS4ERR_BAD_STATEID: 6078 case -NFS4ERR_OLD_STATEID: 6079 case -NFS4ERR_STALE_STATEID: 6080 if (!nfs4_stateid_match(&calldata->arg.stateid, 6081 &calldata->lsp->ls_stateid)) 6082 rpc_restart_call_prepare(task); 6083 break; 6084 default: 6085 if (nfs4_async_handle_error(task, calldata->server, 6086 NULL, NULL) == -EAGAIN) 6087 rpc_restart_call_prepare(task); 6088 } 6089 nfs_release_seqid(calldata->arg.seqid); 6090 } 6091 6092 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6093 { 6094 struct nfs4_unlockdata *calldata = data; 6095 6096 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6097 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6098 return; 6099 6100 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6101 goto out_wait; 6102 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid); 6103 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6104 /* Note: exit _without_ running nfs4_locku_done */ 6105 goto out_no_action; 6106 } 6107 calldata->timestamp = jiffies; 6108 if (nfs4_setup_sequence(calldata->server->nfs_client, 6109 &calldata->arg.seq_args, 6110 &calldata->res.seq_res, 6111 task) != 0) 6112 nfs_release_seqid(calldata->arg.seqid); 6113 return; 6114 out_no_action: 6115 task->tk_action = NULL; 6116 out_wait: 6117 nfs4_sequence_done(task, &calldata->res.seq_res); 6118 } 6119 6120 static const struct rpc_call_ops nfs4_locku_ops = { 6121 .rpc_call_prepare = nfs4_locku_prepare, 6122 .rpc_call_done = nfs4_locku_done, 6123 .rpc_release = nfs4_locku_release_calldata, 6124 }; 6125 6126 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6127 struct nfs_open_context *ctx, 6128 struct nfs4_lock_state *lsp, 6129 struct nfs_seqid *seqid) 6130 { 6131 struct nfs4_unlockdata *data; 6132 struct rpc_message msg = { 6133 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6134 .rpc_cred = ctx->cred, 6135 }; 6136 struct rpc_task_setup task_setup_data = { 6137 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6138 .rpc_message = &msg, 6139 .callback_ops = &nfs4_locku_ops, 6140 .workqueue = nfsiod_workqueue, 6141 .flags = RPC_TASK_ASYNC, 6142 }; 6143 6144 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6145 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6146 6147 /* Ensure this is an unlock - when canceling a lock, the 6148 * canceled lock is passed in, and it won't be an unlock. 6149 */ 6150 fl->fl_type = F_UNLCK; 6151 if (fl->fl_flags & FL_CLOSE) 6152 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6153 6154 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6155 if (data == NULL) { 6156 nfs_free_seqid(seqid); 6157 return ERR_PTR(-ENOMEM); 6158 } 6159 6160 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 6161 msg.rpc_argp = &data->arg; 6162 msg.rpc_resp = &data->res; 6163 task_setup_data.callback_data = data; 6164 return rpc_run_task(&task_setup_data); 6165 } 6166 6167 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6168 { 6169 struct inode *inode = state->inode; 6170 struct nfs4_state_owner *sp = state->owner; 6171 struct nfs_inode *nfsi = NFS_I(inode); 6172 struct nfs_seqid *seqid; 6173 struct nfs4_lock_state *lsp; 6174 struct rpc_task *task; 6175 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6176 int status = 0; 6177 unsigned char fl_flags = request->fl_flags; 6178 6179 status = nfs4_set_lock_state(state, request); 6180 /* Unlock _before_ we do the RPC call */ 6181 request->fl_flags |= FL_EXISTS; 6182 /* Exclude nfs_delegation_claim_locks() */ 6183 mutex_lock(&sp->so_delegreturn_mutex); 6184 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 6185 down_read(&nfsi->rwsem); 6186 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 6187 up_read(&nfsi->rwsem); 6188 mutex_unlock(&sp->so_delegreturn_mutex); 6189 goto out; 6190 } 6191 up_read(&nfsi->rwsem); 6192 mutex_unlock(&sp->so_delegreturn_mutex); 6193 if (status != 0) 6194 goto out; 6195 /* Is this a delegated lock? */ 6196 lsp = request->fl_u.nfs4_fl.owner; 6197 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 6198 goto out; 6199 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 6200 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 6201 status = -ENOMEM; 6202 if (IS_ERR(seqid)) 6203 goto out; 6204 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 6205 status = PTR_ERR(task); 6206 if (IS_ERR(task)) 6207 goto out; 6208 status = rpc_wait_for_completion_task(task); 6209 rpc_put_task(task); 6210 out: 6211 request->fl_flags = fl_flags; 6212 trace_nfs4_unlock(request, state, F_SETLK, status); 6213 return status; 6214 } 6215 6216 struct nfs4_lockdata { 6217 struct nfs_lock_args arg; 6218 struct nfs_lock_res res; 6219 struct nfs4_lock_state *lsp; 6220 struct nfs_open_context *ctx; 6221 struct file_lock fl; 6222 unsigned long timestamp; 6223 int rpc_status; 6224 int cancelled; 6225 struct nfs_server *server; 6226 }; 6227 6228 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 6229 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 6230 gfp_t gfp_mask) 6231 { 6232 struct nfs4_lockdata *p; 6233 struct inode *inode = lsp->ls_state->inode; 6234 struct nfs_server *server = NFS_SERVER(inode); 6235 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6236 6237 p = kzalloc(sizeof(*p), gfp_mask); 6238 if (p == NULL) 6239 return NULL; 6240 6241 p->arg.fh = NFS_FH(inode); 6242 p->arg.fl = &p->fl; 6243 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 6244 if (IS_ERR(p->arg.open_seqid)) 6245 goto out_free; 6246 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 6247 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 6248 if (IS_ERR(p->arg.lock_seqid)) 6249 goto out_free_seqid; 6250 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 6251 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 6252 p->arg.lock_owner.s_dev = server->s_dev; 6253 p->res.lock_seqid = p->arg.lock_seqid; 6254 p->lsp = lsp; 6255 p->server = server; 6256 refcount_inc(&lsp->ls_count); 6257 p->ctx = get_nfs_open_context(ctx); 6258 memcpy(&p->fl, fl, sizeof(p->fl)); 6259 return p; 6260 out_free_seqid: 6261 nfs_free_seqid(p->arg.open_seqid); 6262 out_free: 6263 kfree(p); 6264 return NULL; 6265 } 6266 6267 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 6268 { 6269 struct nfs4_lockdata *data = calldata; 6270 struct nfs4_state *state = data->lsp->ls_state; 6271 6272 dprintk("%s: begin!\n", __func__); 6273 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 6274 goto out_wait; 6275 /* Do we need to do an open_to_lock_owner? */ 6276 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 6277 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 6278 goto out_release_lock_seqid; 6279 } 6280 nfs4_stateid_copy(&data->arg.open_stateid, 6281 &state->open_stateid); 6282 data->arg.new_lock_owner = 1; 6283 data->res.open_seqid = data->arg.open_seqid; 6284 } else { 6285 data->arg.new_lock_owner = 0; 6286 nfs4_stateid_copy(&data->arg.lock_stateid, 6287 &data->lsp->ls_stateid); 6288 } 6289 if (!nfs4_valid_open_stateid(state)) { 6290 data->rpc_status = -EBADF; 6291 task->tk_action = NULL; 6292 goto out_release_open_seqid; 6293 } 6294 data->timestamp = jiffies; 6295 if (nfs4_setup_sequence(data->server->nfs_client, 6296 &data->arg.seq_args, 6297 &data->res.seq_res, 6298 task) == 0) 6299 return; 6300 out_release_open_seqid: 6301 nfs_release_seqid(data->arg.open_seqid); 6302 out_release_lock_seqid: 6303 nfs_release_seqid(data->arg.lock_seqid); 6304 out_wait: 6305 nfs4_sequence_done(task, &data->res.seq_res); 6306 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 6307 } 6308 6309 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 6310 { 6311 struct nfs4_lockdata *data = calldata; 6312 struct nfs4_lock_state *lsp = data->lsp; 6313 6314 dprintk("%s: begin!\n", __func__); 6315 6316 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6317 return; 6318 6319 data->rpc_status = task->tk_status; 6320 switch (task->tk_status) { 6321 case 0: 6322 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 6323 data->timestamp); 6324 if (data->arg.new_lock) { 6325 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 6326 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) { 6327 rpc_restart_call_prepare(task); 6328 break; 6329 } 6330 } 6331 if (data->arg.new_lock_owner != 0) { 6332 nfs_confirm_seqid(&lsp->ls_seqid, 0); 6333 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 6334 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6335 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 6336 rpc_restart_call_prepare(task); 6337 break; 6338 case -NFS4ERR_BAD_STATEID: 6339 case -NFS4ERR_OLD_STATEID: 6340 case -NFS4ERR_STALE_STATEID: 6341 case -NFS4ERR_EXPIRED: 6342 if (data->arg.new_lock_owner != 0) { 6343 if (!nfs4_stateid_match(&data->arg.open_stateid, 6344 &lsp->ls_state->open_stateid)) 6345 rpc_restart_call_prepare(task); 6346 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 6347 &lsp->ls_stateid)) 6348 rpc_restart_call_prepare(task); 6349 } 6350 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 6351 } 6352 6353 static void nfs4_lock_release(void *calldata) 6354 { 6355 struct nfs4_lockdata *data = calldata; 6356 6357 dprintk("%s: begin!\n", __func__); 6358 nfs_free_seqid(data->arg.open_seqid); 6359 if (data->cancelled) { 6360 struct rpc_task *task; 6361 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 6362 data->arg.lock_seqid); 6363 if (!IS_ERR(task)) 6364 rpc_put_task_async(task); 6365 dprintk("%s: cancelling lock!\n", __func__); 6366 } else 6367 nfs_free_seqid(data->arg.lock_seqid); 6368 nfs4_put_lock_state(data->lsp); 6369 put_nfs_open_context(data->ctx); 6370 kfree(data); 6371 dprintk("%s: done!\n", __func__); 6372 } 6373 6374 static const struct rpc_call_ops nfs4_lock_ops = { 6375 .rpc_call_prepare = nfs4_lock_prepare, 6376 .rpc_call_done = nfs4_lock_done, 6377 .rpc_release = nfs4_lock_release, 6378 }; 6379 6380 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 6381 { 6382 switch (error) { 6383 case -NFS4ERR_ADMIN_REVOKED: 6384 case -NFS4ERR_EXPIRED: 6385 case -NFS4ERR_BAD_STATEID: 6386 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6387 if (new_lock_owner != 0 || 6388 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 6389 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 6390 break; 6391 case -NFS4ERR_STALE_STATEID: 6392 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6393 nfs4_schedule_lease_recovery(server->nfs_client); 6394 }; 6395 } 6396 6397 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 6398 { 6399 struct nfs4_lockdata *data; 6400 struct rpc_task *task; 6401 struct rpc_message msg = { 6402 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 6403 .rpc_cred = state->owner->so_cred, 6404 }; 6405 struct rpc_task_setup task_setup_data = { 6406 .rpc_client = NFS_CLIENT(state->inode), 6407 .rpc_message = &msg, 6408 .callback_ops = &nfs4_lock_ops, 6409 .workqueue = nfsiod_workqueue, 6410 .flags = RPC_TASK_ASYNC, 6411 }; 6412 int ret; 6413 6414 dprintk("%s: begin!\n", __func__); 6415 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 6416 fl->fl_u.nfs4_fl.owner, 6417 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 6418 if (data == NULL) 6419 return -ENOMEM; 6420 if (IS_SETLKW(cmd)) 6421 data->arg.block = 1; 6422 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 6423 msg.rpc_argp = &data->arg; 6424 msg.rpc_resp = &data->res; 6425 task_setup_data.callback_data = data; 6426 if (recovery_type > NFS_LOCK_NEW) { 6427 if (recovery_type == NFS_LOCK_RECLAIM) 6428 data->arg.reclaim = NFS_LOCK_RECLAIM; 6429 nfs4_set_sequence_privileged(&data->arg.seq_args); 6430 } else 6431 data->arg.new_lock = 1; 6432 task = rpc_run_task(&task_setup_data); 6433 if (IS_ERR(task)) 6434 return PTR_ERR(task); 6435 ret = rpc_wait_for_completion_task(task); 6436 if (ret == 0) { 6437 ret = data->rpc_status; 6438 if (ret) 6439 nfs4_handle_setlk_error(data->server, data->lsp, 6440 data->arg.new_lock_owner, ret); 6441 } else 6442 data->cancelled = true; 6443 rpc_put_task(task); 6444 dprintk("%s: done, ret = %d!\n", __func__, ret); 6445 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 6446 return ret; 6447 } 6448 6449 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 6450 { 6451 struct nfs_server *server = NFS_SERVER(state->inode); 6452 struct nfs4_exception exception = { 6453 .inode = state->inode, 6454 }; 6455 int err; 6456 6457 do { 6458 /* Cache the lock if possible... */ 6459 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6460 return 0; 6461 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 6462 if (err != -NFS4ERR_DELAY) 6463 break; 6464 nfs4_handle_exception(server, err, &exception); 6465 } while (exception.retry); 6466 return err; 6467 } 6468 6469 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 6470 { 6471 struct nfs_server *server = NFS_SERVER(state->inode); 6472 struct nfs4_exception exception = { 6473 .inode = state->inode, 6474 }; 6475 int err; 6476 6477 err = nfs4_set_lock_state(state, request); 6478 if (err != 0) 6479 return err; 6480 if (!recover_lost_locks) { 6481 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 6482 return 0; 6483 } 6484 do { 6485 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6486 return 0; 6487 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 6488 switch (err) { 6489 default: 6490 goto out; 6491 case -NFS4ERR_GRACE: 6492 case -NFS4ERR_DELAY: 6493 nfs4_handle_exception(server, err, &exception); 6494 err = 0; 6495 } 6496 } while (exception.retry); 6497 out: 6498 return err; 6499 } 6500 6501 #if defined(CONFIG_NFS_V4_1) 6502 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 6503 { 6504 struct nfs4_lock_state *lsp; 6505 int status; 6506 6507 status = nfs4_set_lock_state(state, request); 6508 if (status != 0) 6509 return status; 6510 lsp = request->fl_u.nfs4_fl.owner; 6511 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 6512 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 6513 return 0; 6514 return nfs4_lock_expired(state, request); 6515 } 6516 #endif 6517 6518 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6519 { 6520 struct nfs_inode *nfsi = NFS_I(state->inode); 6521 struct nfs4_state_owner *sp = state->owner; 6522 unsigned char fl_flags = request->fl_flags; 6523 int status; 6524 6525 request->fl_flags |= FL_ACCESS; 6526 status = locks_lock_inode_wait(state->inode, request); 6527 if (status < 0) 6528 goto out; 6529 mutex_lock(&sp->so_delegreturn_mutex); 6530 down_read(&nfsi->rwsem); 6531 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 6532 /* Yes: cache locks! */ 6533 /* ...but avoid races with delegation recall... */ 6534 request->fl_flags = fl_flags & ~FL_SLEEP; 6535 status = locks_lock_inode_wait(state->inode, request); 6536 up_read(&nfsi->rwsem); 6537 mutex_unlock(&sp->so_delegreturn_mutex); 6538 goto out; 6539 } 6540 up_read(&nfsi->rwsem); 6541 mutex_unlock(&sp->so_delegreturn_mutex); 6542 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 6543 out: 6544 request->fl_flags = fl_flags; 6545 return status; 6546 } 6547 6548 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6549 { 6550 struct nfs4_exception exception = { 6551 .state = state, 6552 .inode = state->inode, 6553 }; 6554 int err; 6555 6556 do { 6557 err = _nfs4_proc_setlk(state, cmd, request); 6558 if (err == -NFS4ERR_DENIED) 6559 err = -EAGAIN; 6560 err = nfs4_handle_exception(NFS_SERVER(state->inode), 6561 err, &exception); 6562 } while (exception.retry); 6563 return err; 6564 } 6565 6566 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 6567 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 6568 6569 static int 6570 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 6571 struct file_lock *request) 6572 { 6573 int status = -ERESTARTSYS; 6574 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 6575 6576 while(!signalled()) { 6577 status = nfs4_proc_setlk(state, cmd, request); 6578 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6579 break; 6580 freezable_schedule_timeout_interruptible(timeout); 6581 timeout *= 2; 6582 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 6583 status = -ERESTARTSYS; 6584 } 6585 return status; 6586 } 6587 6588 #ifdef CONFIG_NFS_V4_1 6589 struct nfs4_lock_waiter { 6590 struct task_struct *task; 6591 struct inode *inode; 6592 struct nfs_lowner *owner; 6593 bool notified; 6594 }; 6595 6596 static int 6597 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 6598 { 6599 int ret; 6600 struct cb_notify_lock_args *cbnl = key; 6601 struct nfs4_lock_waiter *waiter = wait->private; 6602 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 6603 *wowner = waiter->owner; 6604 6605 /* Only wake if the callback was for the same owner */ 6606 if (lowner->clientid != wowner->clientid || 6607 lowner->id != wowner->id || 6608 lowner->s_dev != wowner->s_dev) 6609 return 0; 6610 6611 /* Make sure it's for the right inode */ 6612 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 6613 return 0; 6614 6615 waiter->notified = true; 6616 6617 /* override "private" so we can use default_wake_function */ 6618 wait->private = waiter->task; 6619 ret = autoremove_wake_function(wait, mode, flags, key); 6620 wait->private = waiter; 6621 return ret; 6622 } 6623 6624 static int 6625 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6626 { 6627 int status = -ERESTARTSYS; 6628 unsigned long flags; 6629 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 6630 struct nfs_server *server = NFS_SERVER(state->inode); 6631 struct nfs_client *clp = server->nfs_client; 6632 wait_queue_head_t *q = &clp->cl_lock_waitq; 6633 struct nfs_lowner owner = { .clientid = clp->cl_clientid, 6634 .id = lsp->ls_seqid.owner_id, 6635 .s_dev = server->s_dev }; 6636 struct nfs4_lock_waiter waiter = { .task = current, 6637 .inode = state->inode, 6638 .owner = &owner, 6639 .notified = false }; 6640 wait_queue_entry_t wait; 6641 6642 /* Don't bother with waitqueue if we don't expect a callback */ 6643 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 6644 return nfs4_retry_setlk_simple(state, cmd, request); 6645 6646 init_wait(&wait); 6647 wait.private = &waiter; 6648 wait.func = nfs4_wake_lock_waiter; 6649 add_wait_queue(q, &wait); 6650 6651 while(!signalled()) { 6652 status = nfs4_proc_setlk(state, cmd, request); 6653 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6654 break; 6655 6656 status = -ERESTARTSYS; 6657 spin_lock_irqsave(&q->lock, flags); 6658 if (waiter.notified) { 6659 spin_unlock_irqrestore(&q->lock, flags); 6660 continue; 6661 } 6662 set_current_state(TASK_INTERRUPTIBLE); 6663 spin_unlock_irqrestore(&q->lock, flags); 6664 6665 freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT); 6666 } 6667 6668 finish_wait(q, &wait); 6669 return status; 6670 } 6671 #else /* !CONFIG_NFS_V4_1 */ 6672 static inline int 6673 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6674 { 6675 return nfs4_retry_setlk_simple(state, cmd, request); 6676 } 6677 #endif 6678 6679 static int 6680 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 6681 { 6682 struct nfs_open_context *ctx; 6683 struct nfs4_state *state; 6684 int status; 6685 6686 /* verify open state */ 6687 ctx = nfs_file_open_context(filp); 6688 state = ctx->state; 6689 6690 if (IS_GETLK(cmd)) { 6691 if (state != NULL) 6692 return nfs4_proc_getlk(state, F_GETLK, request); 6693 return 0; 6694 } 6695 6696 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 6697 return -EINVAL; 6698 6699 if (request->fl_type == F_UNLCK) { 6700 if (state != NULL) 6701 return nfs4_proc_unlck(state, cmd, request); 6702 return 0; 6703 } 6704 6705 if (state == NULL) 6706 return -ENOLCK; 6707 6708 if ((request->fl_flags & FL_POSIX) && 6709 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 6710 return -ENOLCK; 6711 6712 /* 6713 * Don't rely on the VFS having checked the file open mode, 6714 * since it won't do this for flock() locks. 6715 */ 6716 switch (request->fl_type) { 6717 case F_RDLCK: 6718 if (!(filp->f_mode & FMODE_READ)) 6719 return -EBADF; 6720 break; 6721 case F_WRLCK: 6722 if (!(filp->f_mode & FMODE_WRITE)) 6723 return -EBADF; 6724 } 6725 6726 status = nfs4_set_lock_state(state, request); 6727 if (status != 0) 6728 return status; 6729 6730 return nfs4_retry_setlk(state, cmd, request); 6731 } 6732 6733 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 6734 { 6735 struct nfs_server *server = NFS_SERVER(state->inode); 6736 int err; 6737 6738 err = nfs4_set_lock_state(state, fl); 6739 if (err != 0) 6740 return err; 6741 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 6742 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 6743 } 6744 6745 struct nfs_release_lockowner_data { 6746 struct nfs4_lock_state *lsp; 6747 struct nfs_server *server; 6748 struct nfs_release_lockowner_args args; 6749 struct nfs_release_lockowner_res res; 6750 unsigned long timestamp; 6751 }; 6752 6753 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 6754 { 6755 struct nfs_release_lockowner_data *data = calldata; 6756 struct nfs_server *server = data->server; 6757 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 6758 &data->res.seq_res, task); 6759 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6760 data->timestamp = jiffies; 6761 } 6762 6763 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 6764 { 6765 struct nfs_release_lockowner_data *data = calldata; 6766 struct nfs_server *server = data->server; 6767 6768 nfs40_sequence_done(task, &data->res.seq_res); 6769 6770 switch (task->tk_status) { 6771 case 0: 6772 renew_lease(server, data->timestamp); 6773 break; 6774 case -NFS4ERR_STALE_CLIENTID: 6775 case -NFS4ERR_EXPIRED: 6776 nfs4_schedule_lease_recovery(server->nfs_client); 6777 break; 6778 case -NFS4ERR_LEASE_MOVED: 6779 case -NFS4ERR_DELAY: 6780 if (nfs4_async_handle_error(task, server, 6781 NULL, NULL) == -EAGAIN) 6782 rpc_restart_call_prepare(task); 6783 } 6784 } 6785 6786 static void nfs4_release_lockowner_release(void *calldata) 6787 { 6788 struct nfs_release_lockowner_data *data = calldata; 6789 nfs4_free_lock_state(data->server, data->lsp); 6790 kfree(calldata); 6791 } 6792 6793 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6794 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6795 .rpc_call_done = nfs4_release_lockowner_done, 6796 .rpc_release = nfs4_release_lockowner_release, 6797 }; 6798 6799 static void 6800 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6801 { 6802 struct nfs_release_lockowner_data *data; 6803 struct rpc_message msg = { 6804 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6805 }; 6806 6807 if (server->nfs_client->cl_mvops->minor_version != 0) 6808 return; 6809 6810 data = kmalloc(sizeof(*data), GFP_NOFS); 6811 if (!data) 6812 return; 6813 data->lsp = lsp; 6814 data->server = server; 6815 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6816 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6817 data->args.lock_owner.s_dev = server->s_dev; 6818 6819 msg.rpc_argp = &data->args; 6820 msg.rpc_resp = &data->res; 6821 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 6822 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6823 } 6824 6825 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6826 6827 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 6828 struct dentry *unused, struct inode *inode, 6829 const char *key, const void *buf, 6830 size_t buflen, int flags) 6831 { 6832 return nfs4_proc_set_acl(inode, buf, buflen); 6833 } 6834 6835 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 6836 struct dentry *unused, struct inode *inode, 6837 const char *key, void *buf, size_t buflen) 6838 { 6839 return nfs4_proc_get_acl(inode, buf, buflen); 6840 } 6841 6842 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 6843 { 6844 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 6845 } 6846 6847 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6848 6849 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 6850 struct dentry *unused, struct inode *inode, 6851 const char *key, const void *buf, 6852 size_t buflen, int flags) 6853 { 6854 if (security_ismaclabel(key)) 6855 return nfs4_set_security_label(inode, buf, buflen); 6856 6857 return -EOPNOTSUPP; 6858 } 6859 6860 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 6861 struct dentry *unused, struct inode *inode, 6862 const char *key, void *buf, size_t buflen) 6863 { 6864 if (security_ismaclabel(key)) 6865 return nfs4_get_security_label(inode, buf, buflen); 6866 return -EOPNOTSUPP; 6867 } 6868 6869 static ssize_t 6870 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6871 { 6872 int len = 0; 6873 6874 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 6875 len = security_inode_listsecurity(inode, list, list_len); 6876 if (list_len && len > list_len) 6877 return -ERANGE; 6878 } 6879 return len; 6880 } 6881 6882 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6883 .prefix = XATTR_SECURITY_PREFIX, 6884 .get = nfs4_xattr_get_nfs4_label, 6885 .set = nfs4_xattr_set_nfs4_label, 6886 }; 6887 6888 #else 6889 6890 static ssize_t 6891 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6892 { 6893 return 0; 6894 } 6895 6896 #endif 6897 6898 /* 6899 * nfs_fhget will use either the mounted_on_fileid or the fileid 6900 */ 6901 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6902 { 6903 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6904 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6905 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6906 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6907 return; 6908 6909 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6910 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6911 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6912 fattr->nlink = 2; 6913 } 6914 6915 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6916 const struct qstr *name, 6917 struct nfs4_fs_locations *fs_locations, 6918 struct page *page) 6919 { 6920 struct nfs_server *server = NFS_SERVER(dir); 6921 u32 bitmask[3]; 6922 struct nfs4_fs_locations_arg args = { 6923 .dir_fh = NFS_FH(dir), 6924 .name = name, 6925 .page = page, 6926 .bitmask = bitmask, 6927 }; 6928 struct nfs4_fs_locations_res res = { 6929 .fs_locations = fs_locations, 6930 }; 6931 struct rpc_message msg = { 6932 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6933 .rpc_argp = &args, 6934 .rpc_resp = &res, 6935 }; 6936 int status; 6937 6938 dprintk("%s: start\n", __func__); 6939 6940 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 6941 bitmask[1] = nfs4_fattr_bitmap[1]; 6942 6943 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6944 * is not supported */ 6945 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6946 bitmask[0] &= ~FATTR4_WORD0_FILEID; 6947 else 6948 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 6949 6950 nfs_fattr_init(&fs_locations->fattr); 6951 fs_locations->server = server; 6952 fs_locations->nlocations = 0; 6953 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6954 dprintk("%s: returned status = %d\n", __func__, status); 6955 return status; 6956 } 6957 6958 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6959 const struct qstr *name, 6960 struct nfs4_fs_locations *fs_locations, 6961 struct page *page) 6962 { 6963 struct nfs4_exception exception = { }; 6964 int err; 6965 do { 6966 err = _nfs4_proc_fs_locations(client, dir, name, 6967 fs_locations, page); 6968 trace_nfs4_get_fs_locations(dir, name, err); 6969 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6970 &exception); 6971 } while (exception.retry); 6972 return err; 6973 } 6974 6975 /* 6976 * This operation also signals the server that this client is 6977 * performing migration recovery. The server can stop returning 6978 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 6979 * appended to this compound to identify the client ID which is 6980 * performing recovery. 6981 */ 6982 static int _nfs40_proc_get_locations(struct inode *inode, 6983 struct nfs4_fs_locations *locations, 6984 struct page *page, struct rpc_cred *cred) 6985 { 6986 struct nfs_server *server = NFS_SERVER(inode); 6987 struct rpc_clnt *clnt = server->client; 6988 u32 bitmask[2] = { 6989 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6990 }; 6991 struct nfs4_fs_locations_arg args = { 6992 .clientid = server->nfs_client->cl_clientid, 6993 .fh = NFS_FH(inode), 6994 .page = page, 6995 .bitmask = bitmask, 6996 .migration = 1, /* skip LOOKUP */ 6997 .renew = 1, /* append RENEW */ 6998 }; 6999 struct nfs4_fs_locations_res res = { 7000 .fs_locations = locations, 7001 .migration = 1, 7002 .renew = 1, 7003 }; 7004 struct rpc_message msg = { 7005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7006 .rpc_argp = &args, 7007 .rpc_resp = &res, 7008 .rpc_cred = cred, 7009 }; 7010 unsigned long now = jiffies; 7011 int status; 7012 7013 nfs_fattr_init(&locations->fattr); 7014 locations->server = server; 7015 locations->nlocations = 0; 7016 7017 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7018 nfs4_set_sequence_privileged(&args.seq_args); 7019 status = nfs4_call_sync_sequence(clnt, server, &msg, 7020 &args.seq_args, &res.seq_res); 7021 if (status) 7022 return status; 7023 7024 renew_lease(server, now); 7025 return 0; 7026 } 7027 7028 #ifdef CONFIG_NFS_V4_1 7029 7030 /* 7031 * This operation also signals the server that this client is 7032 * performing migration recovery. The server can stop asserting 7033 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 7034 * performing this operation is identified in the SEQUENCE 7035 * operation in this compound. 7036 * 7037 * When the client supports GETATTR(fs_locations_info), it can 7038 * be plumbed in here. 7039 */ 7040 static int _nfs41_proc_get_locations(struct inode *inode, 7041 struct nfs4_fs_locations *locations, 7042 struct page *page, struct rpc_cred *cred) 7043 { 7044 struct nfs_server *server = NFS_SERVER(inode); 7045 struct rpc_clnt *clnt = server->client; 7046 u32 bitmask[2] = { 7047 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7048 }; 7049 struct nfs4_fs_locations_arg args = { 7050 .fh = NFS_FH(inode), 7051 .page = page, 7052 .bitmask = bitmask, 7053 .migration = 1, /* skip LOOKUP */ 7054 }; 7055 struct nfs4_fs_locations_res res = { 7056 .fs_locations = locations, 7057 .migration = 1, 7058 }; 7059 struct rpc_message msg = { 7060 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7061 .rpc_argp = &args, 7062 .rpc_resp = &res, 7063 .rpc_cred = cred, 7064 }; 7065 int status; 7066 7067 nfs_fattr_init(&locations->fattr); 7068 locations->server = server; 7069 locations->nlocations = 0; 7070 7071 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7072 nfs4_set_sequence_privileged(&args.seq_args); 7073 status = nfs4_call_sync_sequence(clnt, server, &msg, 7074 &args.seq_args, &res.seq_res); 7075 if (status == NFS4_OK && 7076 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7077 status = -NFS4ERR_LEASE_MOVED; 7078 return status; 7079 } 7080 7081 #endif /* CONFIG_NFS_V4_1 */ 7082 7083 /** 7084 * nfs4_proc_get_locations - discover locations for a migrated FSID 7085 * @inode: inode on FSID that is migrating 7086 * @locations: result of query 7087 * @page: buffer 7088 * @cred: credential to use for this operation 7089 * 7090 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 7091 * operation failed, or a negative errno if a local error occurred. 7092 * 7093 * On success, "locations" is filled in, but if the server has 7094 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 7095 * asserted. 7096 * 7097 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 7098 * from this client that require migration recovery. 7099 */ 7100 int nfs4_proc_get_locations(struct inode *inode, 7101 struct nfs4_fs_locations *locations, 7102 struct page *page, struct rpc_cred *cred) 7103 { 7104 struct nfs_server *server = NFS_SERVER(inode); 7105 struct nfs_client *clp = server->nfs_client; 7106 const struct nfs4_mig_recovery_ops *ops = 7107 clp->cl_mvops->mig_recovery_ops; 7108 struct nfs4_exception exception = { }; 7109 int status; 7110 7111 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7112 (unsigned long long)server->fsid.major, 7113 (unsigned long long)server->fsid.minor, 7114 clp->cl_hostname); 7115 nfs_display_fhandle(NFS_FH(inode), __func__); 7116 7117 do { 7118 status = ops->get_locations(inode, locations, page, cred); 7119 if (status != -NFS4ERR_DELAY) 7120 break; 7121 nfs4_handle_exception(server, status, &exception); 7122 } while (exception.retry); 7123 return status; 7124 } 7125 7126 /* 7127 * This operation also signals the server that this client is 7128 * performing "lease moved" recovery. The server can stop 7129 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 7130 * is appended to this compound to identify the client ID which is 7131 * performing recovery. 7132 */ 7133 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7134 { 7135 struct nfs_server *server = NFS_SERVER(inode); 7136 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 7137 struct rpc_clnt *clnt = server->client; 7138 struct nfs4_fsid_present_arg args = { 7139 .fh = NFS_FH(inode), 7140 .clientid = clp->cl_clientid, 7141 .renew = 1, /* append RENEW */ 7142 }; 7143 struct nfs4_fsid_present_res res = { 7144 .renew = 1, 7145 }; 7146 struct rpc_message msg = { 7147 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7148 .rpc_argp = &args, 7149 .rpc_resp = &res, 7150 .rpc_cred = cred, 7151 }; 7152 unsigned long now = jiffies; 7153 int status; 7154 7155 res.fh = nfs_alloc_fhandle(); 7156 if (res.fh == NULL) 7157 return -ENOMEM; 7158 7159 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7160 nfs4_set_sequence_privileged(&args.seq_args); 7161 status = nfs4_call_sync_sequence(clnt, server, &msg, 7162 &args.seq_args, &res.seq_res); 7163 nfs_free_fhandle(res.fh); 7164 if (status) 7165 return status; 7166 7167 do_renew_lease(clp, now); 7168 return 0; 7169 } 7170 7171 #ifdef CONFIG_NFS_V4_1 7172 7173 /* 7174 * This operation also signals the server that this client is 7175 * performing "lease moved" recovery. The server can stop asserting 7176 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 7177 * this operation is identified in the SEQUENCE operation in this 7178 * compound. 7179 */ 7180 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7181 { 7182 struct nfs_server *server = NFS_SERVER(inode); 7183 struct rpc_clnt *clnt = server->client; 7184 struct nfs4_fsid_present_arg args = { 7185 .fh = NFS_FH(inode), 7186 }; 7187 struct nfs4_fsid_present_res res = { 7188 }; 7189 struct rpc_message msg = { 7190 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7191 .rpc_argp = &args, 7192 .rpc_resp = &res, 7193 .rpc_cred = cred, 7194 }; 7195 int status; 7196 7197 res.fh = nfs_alloc_fhandle(); 7198 if (res.fh == NULL) 7199 return -ENOMEM; 7200 7201 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7202 nfs4_set_sequence_privileged(&args.seq_args); 7203 status = nfs4_call_sync_sequence(clnt, server, &msg, 7204 &args.seq_args, &res.seq_res); 7205 nfs_free_fhandle(res.fh); 7206 if (status == NFS4_OK && 7207 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7208 status = -NFS4ERR_LEASE_MOVED; 7209 return status; 7210 } 7211 7212 #endif /* CONFIG_NFS_V4_1 */ 7213 7214 /** 7215 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 7216 * @inode: inode on FSID to check 7217 * @cred: credential to use for this operation 7218 * 7219 * Server indicates whether the FSID is present, moved, or not 7220 * recognized. This operation is necessary to clear a LEASE_MOVED 7221 * condition for this client ID. 7222 * 7223 * Returns NFS4_OK if the FSID is present on this server, 7224 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 7225 * NFS4ERR code if some error occurred on the server, or a 7226 * negative errno if a local failure occurred. 7227 */ 7228 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7229 { 7230 struct nfs_server *server = NFS_SERVER(inode); 7231 struct nfs_client *clp = server->nfs_client; 7232 const struct nfs4_mig_recovery_ops *ops = 7233 clp->cl_mvops->mig_recovery_ops; 7234 struct nfs4_exception exception = { }; 7235 int status; 7236 7237 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7238 (unsigned long long)server->fsid.major, 7239 (unsigned long long)server->fsid.minor, 7240 clp->cl_hostname); 7241 nfs_display_fhandle(NFS_FH(inode), __func__); 7242 7243 do { 7244 status = ops->fsid_present(inode, cred); 7245 if (status != -NFS4ERR_DELAY) 7246 break; 7247 nfs4_handle_exception(server, status, &exception); 7248 } while (exception.retry); 7249 return status; 7250 } 7251 7252 /** 7253 * If 'use_integrity' is true and the state managment nfs_client 7254 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 7255 * and the machine credential as per RFC3530bis and RFC5661 Security 7256 * Considerations sections. Otherwise, just use the user cred with the 7257 * filesystem's rpc_client. 7258 */ 7259 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7260 { 7261 int status; 7262 struct nfs4_secinfo_arg args = { 7263 .dir_fh = NFS_FH(dir), 7264 .name = name, 7265 }; 7266 struct nfs4_secinfo_res res = { 7267 .flavors = flavors, 7268 }; 7269 struct rpc_message msg = { 7270 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 7271 .rpc_argp = &args, 7272 .rpc_resp = &res, 7273 }; 7274 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 7275 struct rpc_cred *cred = NULL; 7276 7277 if (use_integrity) { 7278 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 7279 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 7280 msg.rpc_cred = cred; 7281 } 7282 7283 dprintk("NFS call secinfo %s\n", name->name); 7284 7285 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 7286 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 7287 7288 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 7289 &res.seq_res, 0); 7290 dprintk("NFS reply secinfo: %d\n", status); 7291 7292 if (cred) 7293 put_rpccred(cred); 7294 7295 return status; 7296 } 7297 7298 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 7299 struct nfs4_secinfo_flavors *flavors) 7300 { 7301 struct nfs4_exception exception = { }; 7302 int err; 7303 do { 7304 err = -NFS4ERR_WRONGSEC; 7305 7306 /* try to use integrity protection with machine cred */ 7307 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 7308 err = _nfs4_proc_secinfo(dir, name, flavors, true); 7309 7310 /* 7311 * if unable to use integrity protection, or SECINFO with 7312 * integrity protection returns NFS4ERR_WRONGSEC (which is 7313 * disallowed by spec, but exists in deployed servers) use 7314 * the current filesystem's rpc_client and the user cred. 7315 */ 7316 if (err == -NFS4ERR_WRONGSEC) 7317 err = _nfs4_proc_secinfo(dir, name, flavors, false); 7318 7319 trace_nfs4_secinfo(dir, name, err); 7320 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7321 &exception); 7322 } while (exception.retry); 7323 return err; 7324 } 7325 7326 #ifdef CONFIG_NFS_V4_1 7327 /* 7328 * Check the exchange flags returned by the server for invalid flags, having 7329 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 7330 * DS flags set. 7331 */ 7332 static int nfs4_check_cl_exchange_flags(u32 flags) 7333 { 7334 if (flags & ~EXCHGID4_FLAG_MASK_R) 7335 goto out_inval; 7336 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 7337 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 7338 goto out_inval; 7339 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 7340 goto out_inval; 7341 return NFS_OK; 7342 out_inval: 7343 return -NFS4ERR_INVAL; 7344 } 7345 7346 static bool 7347 nfs41_same_server_scope(struct nfs41_server_scope *a, 7348 struct nfs41_server_scope *b) 7349 { 7350 if (a->server_scope_sz != b->server_scope_sz) 7351 return false; 7352 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 7353 } 7354 7355 static void 7356 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 7357 { 7358 } 7359 7360 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 7361 .rpc_call_done = &nfs4_bind_one_conn_to_session_done, 7362 }; 7363 7364 /* 7365 * nfs4_proc_bind_one_conn_to_session() 7366 * 7367 * The 4.1 client currently uses the same TCP connection for the 7368 * fore and backchannel. 7369 */ 7370 static 7371 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 7372 struct rpc_xprt *xprt, 7373 struct nfs_client *clp, 7374 struct rpc_cred *cred) 7375 { 7376 int status; 7377 struct nfs41_bind_conn_to_session_args args = { 7378 .client = clp, 7379 .dir = NFS4_CDFC4_FORE_OR_BOTH, 7380 }; 7381 struct nfs41_bind_conn_to_session_res res; 7382 struct rpc_message msg = { 7383 .rpc_proc = 7384 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 7385 .rpc_argp = &args, 7386 .rpc_resp = &res, 7387 .rpc_cred = cred, 7388 }; 7389 struct rpc_task_setup task_setup_data = { 7390 .rpc_client = clnt, 7391 .rpc_xprt = xprt, 7392 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 7393 .rpc_message = &msg, 7394 .flags = RPC_TASK_TIMEOUT, 7395 }; 7396 struct rpc_task *task; 7397 7398 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 7399 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 7400 args.dir = NFS4_CDFC4_FORE; 7401 7402 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 7403 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 7404 args.dir = NFS4_CDFC4_FORE; 7405 7406 task = rpc_run_task(&task_setup_data); 7407 if (!IS_ERR(task)) { 7408 status = task->tk_status; 7409 rpc_put_task(task); 7410 } else 7411 status = PTR_ERR(task); 7412 trace_nfs4_bind_conn_to_session(clp, status); 7413 if (status == 0) { 7414 if (memcmp(res.sessionid.data, 7415 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 7416 dprintk("NFS: %s: Session ID mismatch\n", __func__); 7417 return -EIO; 7418 } 7419 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 7420 dprintk("NFS: %s: Unexpected direction from server\n", 7421 __func__); 7422 return -EIO; 7423 } 7424 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 7425 dprintk("NFS: %s: Server returned RDMA mode = true\n", 7426 __func__); 7427 return -EIO; 7428 } 7429 } 7430 7431 return status; 7432 } 7433 7434 struct rpc_bind_conn_calldata { 7435 struct nfs_client *clp; 7436 struct rpc_cred *cred; 7437 }; 7438 7439 static int 7440 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 7441 struct rpc_xprt *xprt, 7442 void *calldata) 7443 { 7444 struct rpc_bind_conn_calldata *p = calldata; 7445 7446 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 7447 } 7448 7449 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 7450 { 7451 struct rpc_bind_conn_calldata data = { 7452 .clp = clp, 7453 .cred = cred, 7454 }; 7455 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 7456 nfs4_proc_bind_conn_to_session_callback, &data); 7457 } 7458 7459 /* 7460 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 7461 * and operations we'd like to see to enable certain features in the allow map 7462 */ 7463 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 7464 .how = SP4_MACH_CRED, 7465 .enforce.u.words = { 7466 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7467 1 << (OP_EXCHANGE_ID - 32) | 7468 1 << (OP_CREATE_SESSION - 32) | 7469 1 << (OP_DESTROY_SESSION - 32) | 7470 1 << (OP_DESTROY_CLIENTID - 32) 7471 }, 7472 .allow.u.words = { 7473 [0] = 1 << (OP_CLOSE) | 7474 1 << (OP_OPEN_DOWNGRADE) | 7475 1 << (OP_LOCKU) | 7476 1 << (OP_DELEGRETURN) | 7477 1 << (OP_COMMIT), 7478 [1] = 1 << (OP_SECINFO - 32) | 7479 1 << (OP_SECINFO_NO_NAME - 32) | 7480 1 << (OP_LAYOUTRETURN - 32) | 7481 1 << (OP_TEST_STATEID - 32) | 7482 1 << (OP_FREE_STATEID - 32) | 7483 1 << (OP_WRITE - 32) 7484 } 7485 }; 7486 7487 /* 7488 * Select the state protection mode for client `clp' given the server results 7489 * from exchange_id in `sp'. 7490 * 7491 * Returns 0 on success, negative errno otherwise. 7492 */ 7493 static int nfs4_sp4_select_mode(struct nfs_client *clp, 7494 struct nfs41_state_protection *sp) 7495 { 7496 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 7497 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7498 1 << (OP_EXCHANGE_ID - 32) | 7499 1 << (OP_CREATE_SESSION - 32) | 7500 1 << (OP_DESTROY_SESSION - 32) | 7501 1 << (OP_DESTROY_CLIENTID - 32) 7502 }; 7503 unsigned long flags = 0; 7504 unsigned int i; 7505 int ret = 0; 7506 7507 if (sp->how == SP4_MACH_CRED) { 7508 /* Print state protect result */ 7509 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 7510 for (i = 0; i <= LAST_NFS4_OP; i++) { 7511 if (test_bit(i, sp->enforce.u.longs)) 7512 dfprintk(MOUNT, " enforce op %d\n", i); 7513 if (test_bit(i, sp->allow.u.longs)) 7514 dfprintk(MOUNT, " allow op %d\n", i); 7515 } 7516 7517 /* make sure nothing is on enforce list that isn't supported */ 7518 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 7519 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 7520 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7521 ret = -EINVAL; 7522 goto out; 7523 } 7524 } 7525 7526 /* 7527 * Minimal mode - state operations are allowed to use machine 7528 * credential. Note this already happens by default, so the 7529 * client doesn't have to do anything more than the negotiation. 7530 * 7531 * NOTE: we don't care if EXCHANGE_ID is in the list - 7532 * we're already using the machine cred for exchange_id 7533 * and will never use a different cred. 7534 */ 7535 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 7536 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 7537 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 7538 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 7539 dfprintk(MOUNT, "sp4_mach_cred:\n"); 7540 dfprintk(MOUNT, " minimal mode enabled\n"); 7541 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 7542 } else { 7543 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7544 ret = -EINVAL; 7545 goto out; 7546 } 7547 7548 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 7549 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 7550 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 7551 test_bit(OP_LOCKU, sp->allow.u.longs)) { 7552 dfprintk(MOUNT, " cleanup mode enabled\n"); 7553 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 7554 } 7555 7556 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 7557 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 7558 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 7559 } 7560 7561 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 7562 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 7563 dfprintk(MOUNT, " secinfo mode enabled\n"); 7564 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 7565 } 7566 7567 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 7568 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 7569 dfprintk(MOUNT, " stateid mode enabled\n"); 7570 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 7571 } 7572 7573 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 7574 dfprintk(MOUNT, " write mode enabled\n"); 7575 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 7576 } 7577 7578 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 7579 dfprintk(MOUNT, " commit mode enabled\n"); 7580 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 7581 } 7582 } 7583 out: 7584 clp->cl_sp4_flags = flags; 7585 return 0; 7586 } 7587 7588 struct nfs41_exchange_id_data { 7589 struct nfs41_exchange_id_res res; 7590 struct nfs41_exchange_id_args args; 7591 }; 7592 7593 static void nfs4_exchange_id_release(void *data) 7594 { 7595 struct nfs41_exchange_id_data *cdata = 7596 (struct nfs41_exchange_id_data *)data; 7597 7598 nfs_put_client(cdata->args.client); 7599 kfree(cdata->res.impl_id); 7600 kfree(cdata->res.server_scope); 7601 kfree(cdata->res.server_owner); 7602 kfree(cdata); 7603 } 7604 7605 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 7606 .rpc_release = nfs4_exchange_id_release, 7607 }; 7608 7609 /* 7610 * _nfs4_proc_exchange_id() 7611 * 7612 * Wrapper for EXCHANGE_ID operation. 7613 */ 7614 static struct rpc_task * 7615 nfs4_run_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7616 u32 sp4_how, struct rpc_xprt *xprt) 7617 { 7618 struct rpc_message msg = { 7619 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 7620 .rpc_cred = cred, 7621 }; 7622 struct rpc_task_setup task_setup_data = { 7623 .rpc_client = clp->cl_rpcclient, 7624 .callback_ops = &nfs4_exchange_id_call_ops, 7625 .rpc_message = &msg, 7626 .flags = RPC_TASK_TIMEOUT, 7627 }; 7628 struct nfs41_exchange_id_data *calldata; 7629 int status; 7630 7631 if (!refcount_inc_not_zero(&clp->cl_count)) 7632 return ERR_PTR(-EIO); 7633 7634 status = -ENOMEM; 7635 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7636 if (!calldata) 7637 goto out; 7638 7639 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 7640 7641 status = nfs4_init_uniform_client_string(clp); 7642 if (status) 7643 goto out_calldata; 7644 7645 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 7646 GFP_NOFS); 7647 status = -ENOMEM; 7648 if (unlikely(calldata->res.server_owner == NULL)) 7649 goto out_calldata; 7650 7651 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 7652 GFP_NOFS); 7653 if (unlikely(calldata->res.server_scope == NULL)) 7654 goto out_server_owner; 7655 7656 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 7657 if (unlikely(calldata->res.impl_id == NULL)) 7658 goto out_server_scope; 7659 7660 switch (sp4_how) { 7661 case SP4_NONE: 7662 calldata->args.state_protect.how = SP4_NONE; 7663 break; 7664 7665 case SP4_MACH_CRED: 7666 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 7667 break; 7668 7669 default: 7670 /* unsupported! */ 7671 WARN_ON_ONCE(1); 7672 status = -EINVAL; 7673 goto out_impl_id; 7674 } 7675 if (xprt) { 7676 task_setup_data.rpc_xprt = xprt; 7677 task_setup_data.flags |= RPC_TASK_SOFTCONN; 7678 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 7679 sizeof(calldata->args.verifier.data)); 7680 } 7681 calldata->args.client = clp; 7682 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 7683 EXCHGID4_FLAG_BIND_PRINC_STATEID; 7684 #ifdef CONFIG_NFS_V4_1_MIGRATION 7685 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 7686 #endif 7687 msg.rpc_argp = &calldata->args; 7688 msg.rpc_resp = &calldata->res; 7689 task_setup_data.callback_data = calldata; 7690 7691 return rpc_run_task(&task_setup_data); 7692 7693 out_impl_id: 7694 kfree(calldata->res.impl_id); 7695 out_server_scope: 7696 kfree(calldata->res.server_scope); 7697 out_server_owner: 7698 kfree(calldata->res.server_owner); 7699 out_calldata: 7700 kfree(calldata); 7701 out: 7702 nfs_put_client(clp); 7703 return ERR_PTR(status); 7704 } 7705 7706 /* 7707 * _nfs4_proc_exchange_id() 7708 * 7709 * Wrapper for EXCHANGE_ID operation. 7710 */ 7711 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7712 u32 sp4_how) 7713 { 7714 struct rpc_task *task; 7715 struct nfs41_exchange_id_args *argp; 7716 struct nfs41_exchange_id_res *resp; 7717 int status; 7718 7719 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 7720 if (IS_ERR(task)) 7721 return PTR_ERR(task); 7722 7723 argp = task->tk_msg.rpc_argp; 7724 resp = task->tk_msg.rpc_resp; 7725 status = task->tk_status; 7726 if (status != 0) 7727 goto out; 7728 7729 status = nfs4_check_cl_exchange_flags(resp->flags); 7730 if (status != 0) 7731 goto out; 7732 7733 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 7734 if (status != 0) 7735 goto out; 7736 7737 clp->cl_clientid = resp->clientid; 7738 clp->cl_exchange_flags = resp->flags; 7739 clp->cl_seqid = resp->seqid; 7740 /* Client ID is not confirmed */ 7741 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 7742 clear_bit(NFS4_SESSION_ESTABLISHED, 7743 &clp->cl_session->session_state); 7744 7745 if (clp->cl_serverscope != NULL && 7746 !nfs41_same_server_scope(clp->cl_serverscope, 7747 resp->server_scope)) { 7748 dprintk("%s: server_scope mismatch detected\n", 7749 __func__); 7750 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 7751 } 7752 7753 swap(clp->cl_serverowner, resp->server_owner); 7754 swap(clp->cl_serverscope, resp->server_scope); 7755 swap(clp->cl_implid, resp->impl_id); 7756 7757 /* Save the EXCHANGE_ID verifier session trunk tests */ 7758 memcpy(clp->cl_confirm.data, argp->verifier.data, 7759 sizeof(clp->cl_confirm.data)); 7760 out: 7761 trace_nfs4_exchange_id(clp, status); 7762 rpc_put_task(task); 7763 return status; 7764 } 7765 7766 /* 7767 * nfs4_proc_exchange_id() 7768 * 7769 * Returns zero, a negative errno, or a negative NFS4ERR status code. 7770 * 7771 * Since the clientid has expired, all compounds using sessions 7772 * associated with the stale clientid will be returning 7773 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 7774 * be in some phase of session reset. 7775 * 7776 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 7777 */ 7778 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 7779 { 7780 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 7781 int status; 7782 7783 /* try SP4_MACH_CRED if krb5i/p */ 7784 if (authflavor == RPC_AUTH_GSS_KRB5I || 7785 authflavor == RPC_AUTH_GSS_KRB5P) { 7786 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 7787 if (!status) 7788 return 0; 7789 } 7790 7791 /* try SP4_NONE */ 7792 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 7793 } 7794 7795 /** 7796 * nfs4_test_session_trunk 7797 * 7798 * This is an add_xprt_test() test function called from 7799 * rpc_clnt_setup_test_and_add_xprt. 7800 * 7801 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 7802 * and is dereferrenced in nfs4_exchange_id_release 7803 * 7804 * Upon success, add the new transport to the rpc_clnt 7805 * 7806 * @clnt: struct rpc_clnt to get new transport 7807 * @xprt: the rpc_xprt to test 7808 * @data: call data for _nfs4_proc_exchange_id. 7809 */ 7810 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 7811 void *data) 7812 { 7813 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 7814 struct rpc_task *task; 7815 int status; 7816 7817 u32 sp4_how; 7818 7819 dprintk("--> %s try %s\n", __func__, 7820 xprt->address_strings[RPC_DISPLAY_ADDR]); 7821 7822 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 7823 7824 /* Test connection for session trunking. Async exchange_id call */ 7825 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 7826 if (IS_ERR(task)) 7827 return PTR_ERR(task); 7828 7829 status = task->tk_status; 7830 if (status == 0) 7831 status = nfs4_detect_session_trunking(adata->clp, 7832 task->tk_msg.rpc_resp, xprt); 7833 7834 rpc_put_task(task); 7835 return status; 7836 } 7837 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 7838 7839 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 7840 struct rpc_cred *cred) 7841 { 7842 struct rpc_message msg = { 7843 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 7844 .rpc_argp = clp, 7845 .rpc_cred = cred, 7846 }; 7847 int status; 7848 7849 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7850 trace_nfs4_destroy_clientid(clp, status); 7851 if (status) 7852 dprintk("NFS: Got error %d from the server %s on " 7853 "DESTROY_CLIENTID.", status, clp->cl_hostname); 7854 return status; 7855 } 7856 7857 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 7858 struct rpc_cred *cred) 7859 { 7860 unsigned int loop; 7861 int ret; 7862 7863 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 7864 ret = _nfs4_proc_destroy_clientid(clp, cred); 7865 switch (ret) { 7866 case -NFS4ERR_DELAY: 7867 case -NFS4ERR_CLIENTID_BUSY: 7868 ssleep(1); 7869 break; 7870 default: 7871 return ret; 7872 } 7873 } 7874 return 0; 7875 } 7876 7877 int nfs4_destroy_clientid(struct nfs_client *clp) 7878 { 7879 struct rpc_cred *cred; 7880 int ret = 0; 7881 7882 if (clp->cl_mvops->minor_version < 1) 7883 goto out; 7884 if (clp->cl_exchange_flags == 0) 7885 goto out; 7886 if (clp->cl_preserve_clid) 7887 goto out; 7888 cred = nfs4_get_clid_cred(clp); 7889 ret = nfs4_proc_destroy_clientid(clp, cred); 7890 if (cred) 7891 put_rpccred(cred); 7892 switch (ret) { 7893 case 0: 7894 case -NFS4ERR_STALE_CLIENTID: 7895 clp->cl_exchange_flags = 0; 7896 } 7897 out: 7898 return ret; 7899 } 7900 7901 struct nfs4_get_lease_time_data { 7902 struct nfs4_get_lease_time_args *args; 7903 struct nfs4_get_lease_time_res *res; 7904 struct nfs_client *clp; 7905 }; 7906 7907 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 7908 void *calldata) 7909 { 7910 struct nfs4_get_lease_time_data *data = 7911 (struct nfs4_get_lease_time_data *)calldata; 7912 7913 dprintk("--> %s\n", __func__); 7914 /* just setup sequence, do not trigger session recovery 7915 since we're invoked within one */ 7916 nfs4_setup_sequence(data->clp, 7917 &data->args->la_seq_args, 7918 &data->res->lr_seq_res, 7919 task); 7920 dprintk("<-- %s\n", __func__); 7921 } 7922 7923 /* 7924 * Called from nfs4_state_manager thread for session setup, so don't recover 7925 * from sequence operation or clientid errors. 7926 */ 7927 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 7928 { 7929 struct nfs4_get_lease_time_data *data = 7930 (struct nfs4_get_lease_time_data *)calldata; 7931 7932 dprintk("--> %s\n", __func__); 7933 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 7934 return; 7935 switch (task->tk_status) { 7936 case -NFS4ERR_DELAY: 7937 case -NFS4ERR_GRACE: 7938 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 7939 rpc_delay(task, NFS4_POLL_RETRY_MIN); 7940 task->tk_status = 0; 7941 /* fall through */ 7942 case -NFS4ERR_RETRY_UNCACHED_REP: 7943 rpc_restart_call_prepare(task); 7944 return; 7945 } 7946 dprintk("<-- %s\n", __func__); 7947 } 7948 7949 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 7950 .rpc_call_prepare = nfs4_get_lease_time_prepare, 7951 .rpc_call_done = nfs4_get_lease_time_done, 7952 }; 7953 7954 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 7955 { 7956 struct rpc_task *task; 7957 struct nfs4_get_lease_time_args args; 7958 struct nfs4_get_lease_time_res res = { 7959 .lr_fsinfo = fsinfo, 7960 }; 7961 struct nfs4_get_lease_time_data data = { 7962 .args = &args, 7963 .res = &res, 7964 .clp = clp, 7965 }; 7966 struct rpc_message msg = { 7967 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 7968 .rpc_argp = &args, 7969 .rpc_resp = &res, 7970 }; 7971 struct rpc_task_setup task_setup = { 7972 .rpc_client = clp->cl_rpcclient, 7973 .rpc_message = &msg, 7974 .callback_ops = &nfs4_get_lease_time_ops, 7975 .callback_data = &data, 7976 .flags = RPC_TASK_TIMEOUT, 7977 }; 7978 int status; 7979 7980 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 7981 nfs4_set_sequence_privileged(&args.la_seq_args); 7982 task = rpc_run_task(&task_setup); 7983 7984 if (IS_ERR(task)) 7985 return PTR_ERR(task); 7986 7987 status = task->tk_status; 7988 rpc_put_task(task); 7989 return status; 7990 } 7991 7992 /* 7993 * Initialize the values to be used by the client in CREATE_SESSION 7994 * If nfs4_init_session set the fore channel request and response sizes, 7995 * use them. 7996 * 7997 * Set the back channel max_resp_sz_cached to zero to force the client to 7998 * always set csa_cachethis to FALSE because the current implementation 7999 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 8000 */ 8001 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 8002 struct rpc_clnt *clnt) 8003 { 8004 unsigned int max_rqst_sz, max_resp_sz; 8005 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 8006 8007 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 8008 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 8009 8010 /* Fore channel attributes */ 8011 args->fc_attrs.max_rqst_sz = max_rqst_sz; 8012 args->fc_attrs.max_resp_sz = max_resp_sz; 8013 args->fc_attrs.max_ops = NFS4_MAX_OPS; 8014 args->fc_attrs.max_reqs = max_session_slots; 8015 8016 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 8017 "max_ops=%u max_reqs=%u\n", 8018 __func__, 8019 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 8020 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 8021 8022 /* Back channel attributes */ 8023 args->bc_attrs.max_rqst_sz = max_bc_payload; 8024 args->bc_attrs.max_resp_sz = max_bc_payload; 8025 args->bc_attrs.max_resp_sz_cached = 0; 8026 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 8027 args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1); 8028 8029 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 8030 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 8031 __func__, 8032 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 8033 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 8034 args->bc_attrs.max_reqs); 8035 } 8036 8037 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 8038 struct nfs41_create_session_res *res) 8039 { 8040 struct nfs4_channel_attrs *sent = &args->fc_attrs; 8041 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 8042 8043 if (rcvd->max_resp_sz > sent->max_resp_sz) 8044 return -EINVAL; 8045 /* 8046 * Our requested max_ops is the minimum we need; we're not 8047 * prepared to break up compounds into smaller pieces than that. 8048 * So, no point even trying to continue if the server won't 8049 * cooperate: 8050 */ 8051 if (rcvd->max_ops < sent->max_ops) 8052 return -EINVAL; 8053 if (rcvd->max_reqs == 0) 8054 return -EINVAL; 8055 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 8056 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 8057 return 0; 8058 } 8059 8060 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 8061 struct nfs41_create_session_res *res) 8062 { 8063 struct nfs4_channel_attrs *sent = &args->bc_attrs; 8064 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 8065 8066 if (!(res->flags & SESSION4_BACK_CHAN)) 8067 goto out; 8068 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 8069 return -EINVAL; 8070 if (rcvd->max_resp_sz < sent->max_resp_sz) 8071 return -EINVAL; 8072 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 8073 return -EINVAL; 8074 if (rcvd->max_ops > sent->max_ops) 8075 return -EINVAL; 8076 if (rcvd->max_reqs > sent->max_reqs) 8077 return -EINVAL; 8078 out: 8079 return 0; 8080 } 8081 8082 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 8083 struct nfs41_create_session_res *res) 8084 { 8085 int ret; 8086 8087 ret = nfs4_verify_fore_channel_attrs(args, res); 8088 if (ret) 8089 return ret; 8090 return nfs4_verify_back_channel_attrs(args, res); 8091 } 8092 8093 static void nfs4_update_session(struct nfs4_session *session, 8094 struct nfs41_create_session_res *res) 8095 { 8096 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 8097 /* Mark client id and session as being confirmed */ 8098 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 8099 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 8100 session->flags = res->flags; 8101 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 8102 if (res->flags & SESSION4_BACK_CHAN) 8103 memcpy(&session->bc_attrs, &res->bc_attrs, 8104 sizeof(session->bc_attrs)); 8105 } 8106 8107 static int _nfs4_proc_create_session(struct nfs_client *clp, 8108 struct rpc_cred *cred) 8109 { 8110 struct nfs4_session *session = clp->cl_session; 8111 struct nfs41_create_session_args args = { 8112 .client = clp, 8113 .clientid = clp->cl_clientid, 8114 .seqid = clp->cl_seqid, 8115 .cb_program = NFS4_CALLBACK, 8116 }; 8117 struct nfs41_create_session_res res; 8118 8119 struct rpc_message msg = { 8120 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 8121 .rpc_argp = &args, 8122 .rpc_resp = &res, 8123 .rpc_cred = cred, 8124 }; 8125 int status; 8126 8127 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 8128 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 8129 8130 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8131 trace_nfs4_create_session(clp, status); 8132 8133 switch (status) { 8134 case -NFS4ERR_STALE_CLIENTID: 8135 case -NFS4ERR_DELAY: 8136 case -ETIMEDOUT: 8137 case -EACCES: 8138 case -EAGAIN: 8139 goto out; 8140 }; 8141 8142 clp->cl_seqid++; 8143 if (!status) { 8144 /* Verify the session's negotiated channel_attrs values */ 8145 status = nfs4_verify_channel_attrs(&args, &res); 8146 /* Increment the clientid slot sequence id */ 8147 if (status) 8148 goto out; 8149 nfs4_update_session(session, &res); 8150 } 8151 out: 8152 return status; 8153 } 8154 8155 /* 8156 * Issues a CREATE_SESSION operation to the server. 8157 * It is the responsibility of the caller to verify the session is 8158 * expired before calling this routine. 8159 */ 8160 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 8161 { 8162 int status; 8163 unsigned *ptr; 8164 struct nfs4_session *session = clp->cl_session; 8165 8166 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 8167 8168 status = _nfs4_proc_create_session(clp, cred); 8169 if (status) 8170 goto out; 8171 8172 /* Init or reset the session slot tables */ 8173 status = nfs4_setup_session_slot_tables(session); 8174 dprintk("slot table setup returned %d\n", status); 8175 if (status) 8176 goto out; 8177 8178 ptr = (unsigned *)&session->sess_id.data[0]; 8179 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 8180 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 8181 out: 8182 dprintk("<-- %s\n", __func__); 8183 return status; 8184 } 8185 8186 /* 8187 * Issue the over-the-wire RPC DESTROY_SESSION. 8188 * The caller must serialize access to this routine. 8189 */ 8190 int nfs4_proc_destroy_session(struct nfs4_session *session, 8191 struct rpc_cred *cred) 8192 { 8193 struct rpc_message msg = { 8194 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 8195 .rpc_argp = session, 8196 .rpc_cred = cred, 8197 }; 8198 int status = 0; 8199 8200 dprintk("--> nfs4_proc_destroy_session\n"); 8201 8202 /* session is still being setup */ 8203 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 8204 return 0; 8205 8206 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8207 trace_nfs4_destroy_session(session->clp, status); 8208 8209 if (status) 8210 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 8211 "Session has been destroyed regardless...\n", status); 8212 8213 dprintk("<-- nfs4_proc_destroy_session\n"); 8214 return status; 8215 } 8216 8217 /* 8218 * Renew the cl_session lease. 8219 */ 8220 struct nfs4_sequence_data { 8221 struct nfs_client *clp; 8222 struct nfs4_sequence_args args; 8223 struct nfs4_sequence_res res; 8224 }; 8225 8226 static void nfs41_sequence_release(void *data) 8227 { 8228 struct nfs4_sequence_data *calldata = data; 8229 struct nfs_client *clp = calldata->clp; 8230 8231 if (refcount_read(&clp->cl_count) > 1) 8232 nfs4_schedule_state_renewal(clp); 8233 nfs_put_client(clp); 8234 kfree(calldata); 8235 } 8236 8237 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8238 { 8239 switch(task->tk_status) { 8240 case -NFS4ERR_DELAY: 8241 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8242 return -EAGAIN; 8243 default: 8244 nfs4_schedule_lease_recovery(clp); 8245 } 8246 return 0; 8247 } 8248 8249 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 8250 { 8251 struct nfs4_sequence_data *calldata = data; 8252 struct nfs_client *clp = calldata->clp; 8253 8254 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 8255 return; 8256 8257 trace_nfs4_sequence(clp, task->tk_status); 8258 if (task->tk_status < 0) { 8259 dprintk("%s ERROR %d\n", __func__, task->tk_status); 8260 if (refcount_read(&clp->cl_count) == 1) 8261 goto out; 8262 8263 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 8264 rpc_restart_call_prepare(task); 8265 return; 8266 } 8267 } 8268 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 8269 out: 8270 dprintk("<-- %s\n", __func__); 8271 } 8272 8273 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 8274 { 8275 struct nfs4_sequence_data *calldata = data; 8276 struct nfs_client *clp = calldata->clp; 8277 struct nfs4_sequence_args *args; 8278 struct nfs4_sequence_res *res; 8279 8280 args = task->tk_msg.rpc_argp; 8281 res = task->tk_msg.rpc_resp; 8282 8283 nfs4_setup_sequence(clp, args, res, task); 8284 } 8285 8286 static const struct rpc_call_ops nfs41_sequence_ops = { 8287 .rpc_call_done = nfs41_sequence_call_done, 8288 .rpc_call_prepare = nfs41_sequence_prepare, 8289 .rpc_release = nfs41_sequence_release, 8290 }; 8291 8292 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 8293 struct rpc_cred *cred, 8294 struct nfs4_slot *slot, 8295 bool is_privileged) 8296 { 8297 struct nfs4_sequence_data *calldata; 8298 struct rpc_message msg = { 8299 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 8300 .rpc_cred = cred, 8301 }; 8302 struct rpc_task_setup task_setup_data = { 8303 .rpc_client = clp->cl_rpcclient, 8304 .rpc_message = &msg, 8305 .callback_ops = &nfs41_sequence_ops, 8306 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 8307 }; 8308 struct rpc_task *ret; 8309 8310 ret = ERR_PTR(-EIO); 8311 if (!refcount_inc_not_zero(&clp->cl_count)) 8312 goto out_err; 8313 8314 ret = ERR_PTR(-ENOMEM); 8315 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8316 if (calldata == NULL) 8317 goto out_put_clp; 8318 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 8319 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 8320 if (is_privileged) 8321 nfs4_set_sequence_privileged(&calldata->args); 8322 msg.rpc_argp = &calldata->args; 8323 msg.rpc_resp = &calldata->res; 8324 calldata->clp = clp; 8325 task_setup_data.callback_data = calldata; 8326 8327 ret = rpc_run_task(&task_setup_data); 8328 if (IS_ERR(ret)) 8329 goto out_err; 8330 return ret; 8331 out_put_clp: 8332 nfs_put_client(clp); 8333 out_err: 8334 nfs41_release_slot(slot); 8335 return ret; 8336 } 8337 8338 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 8339 { 8340 struct rpc_task *task; 8341 int ret = 0; 8342 8343 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 8344 return -EAGAIN; 8345 task = _nfs41_proc_sequence(clp, cred, NULL, false); 8346 if (IS_ERR(task)) 8347 ret = PTR_ERR(task); 8348 else 8349 rpc_put_task_async(task); 8350 dprintk("<-- %s status=%d\n", __func__, ret); 8351 return ret; 8352 } 8353 8354 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 8355 { 8356 struct rpc_task *task; 8357 int ret; 8358 8359 task = _nfs41_proc_sequence(clp, cred, NULL, true); 8360 if (IS_ERR(task)) { 8361 ret = PTR_ERR(task); 8362 goto out; 8363 } 8364 ret = rpc_wait_for_completion_task(task); 8365 if (!ret) 8366 ret = task->tk_status; 8367 rpc_put_task(task); 8368 out: 8369 dprintk("<-- %s status=%d\n", __func__, ret); 8370 return ret; 8371 } 8372 8373 struct nfs4_reclaim_complete_data { 8374 struct nfs_client *clp; 8375 struct nfs41_reclaim_complete_args arg; 8376 struct nfs41_reclaim_complete_res res; 8377 }; 8378 8379 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 8380 { 8381 struct nfs4_reclaim_complete_data *calldata = data; 8382 8383 nfs4_setup_sequence(calldata->clp, 8384 &calldata->arg.seq_args, 8385 &calldata->res.seq_res, 8386 task); 8387 } 8388 8389 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8390 { 8391 switch(task->tk_status) { 8392 case 0: 8393 case -NFS4ERR_COMPLETE_ALREADY: 8394 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 8395 break; 8396 case -NFS4ERR_DELAY: 8397 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8398 /* fall through */ 8399 case -NFS4ERR_RETRY_UNCACHED_REP: 8400 return -EAGAIN; 8401 case -NFS4ERR_BADSESSION: 8402 case -NFS4ERR_DEADSESSION: 8403 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 8404 nfs4_schedule_session_recovery(clp->cl_session, 8405 task->tk_status); 8406 break; 8407 default: 8408 nfs4_schedule_lease_recovery(clp); 8409 } 8410 return 0; 8411 } 8412 8413 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 8414 { 8415 struct nfs4_reclaim_complete_data *calldata = data; 8416 struct nfs_client *clp = calldata->clp; 8417 struct nfs4_sequence_res *res = &calldata->res.seq_res; 8418 8419 dprintk("--> %s\n", __func__); 8420 if (!nfs41_sequence_done(task, res)) 8421 return; 8422 8423 trace_nfs4_reclaim_complete(clp, task->tk_status); 8424 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 8425 rpc_restart_call_prepare(task); 8426 return; 8427 } 8428 dprintk("<-- %s\n", __func__); 8429 } 8430 8431 static void nfs4_free_reclaim_complete_data(void *data) 8432 { 8433 struct nfs4_reclaim_complete_data *calldata = data; 8434 8435 kfree(calldata); 8436 } 8437 8438 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 8439 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 8440 .rpc_call_done = nfs4_reclaim_complete_done, 8441 .rpc_release = nfs4_free_reclaim_complete_data, 8442 }; 8443 8444 /* 8445 * Issue a global reclaim complete. 8446 */ 8447 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 8448 struct rpc_cred *cred) 8449 { 8450 struct nfs4_reclaim_complete_data *calldata; 8451 struct rpc_task *task; 8452 struct rpc_message msg = { 8453 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 8454 .rpc_cred = cred, 8455 }; 8456 struct rpc_task_setup task_setup_data = { 8457 .rpc_client = clp->cl_rpcclient, 8458 .rpc_message = &msg, 8459 .callback_ops = &nfs4_reclaim_complete_call_ops, 8460 .flags = RPC_TASK_ASYNC, 8461 }; 8462 int status = -ENOMEM; 8463 8464 dprintk("--> %s\n", __func__); 8465 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8466 if (calldata == NULL) 8467 goto out; 8468 calldata->clp = clp; 8469 calldata->arg.one_fs = 0; 8470 8471 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 8472 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 8473 msg.rpc_argp = &calldata->arg; 8474 msg.rpc_resp = &calldata->res; 8475 task_setup_data.callback_data = calldata; 8476 task = rpc_run_task(&task_setup_data); 8477 if (IS_ERR(task)) { 8478 status = PTR_ERR(task); 8479 goto out; 8480 } 8481 status = rpc_wait_for_completion_task(task); 8482 if (status == 0) 8483 status = task->tk_status; 8484 rpc_put_task(task); 8485 out: 8486 dprintk("<-- %s status=%d\n", __func__, status); 8487 return status; 8488 } 8489 8490 static void 8491 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 8492 { 8493 struct nfs4_layoutget *lgp = calldata; 8494 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 8495 8496 dprintk("--> %s\n", __func__); 8497 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 8498 &lgp->res.seq_res, task); 8499 dprintk("<-- %s\n", __func__); 8500 } 8501 8502 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 8503 { 8504 struct nfs4_layoutget *lgp = calldata; 8505 8506 dprintk("--> %s\n", __func__); 8507 nfs41_sequence_process(task, &lgp->res.seq_res); 8508 dprintk("<-- %s\n", __func__); 8509 } 8510 8511 static int 8512 nfs4_layoutget_handle_exception(struct rpc_task *task, 8513 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 8514 { 8515 struct inode *inode = lgp->args.inode; 8516 struct nfs_server *server = NFS_SERVER(inode); 8517 struct pnfs_layout_hdr *lo; 8518 int nfs4err = task->tk_status; 8519 int err, status = 0; 8520 LIST_HEAD(head); 8521 8522 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 8523 8524 switch (nfs4err) { 8525 case 0: 8526 goto out; 8527 8528 /* 8529 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 8530 * on the file. set tk_status to -ENODATA to tell upper layer to 8531 * retry go inband. 8532 */ 8533 case -NFS4ERR_LAYOUTUNAVAILABLE: 8534 status = -ENODATA; 8535 goto out; 8536 /* 8537 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 8538 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 8539 */ 8540 case -NFS4ERR_BADLAYOUT: 8541 status = -EOVERFLOW; 8542 goto out; 8543 /* 8544 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 8545 * (or clients) writing to the same RAID stripe except when 8546 * the minlength argument is 0 (see RFC5661 section 18.43.3). 8547 * 8548 * Treat it like we would RECALLCONFLICT -- we retry for a little 8549 * while, and then eventually give up. 8550 */ 8551 case -NFS4ERR_LAYOUTTRYLATER: 8552 if (lgp->args.minlength == 0) { 8553 status = -EOVERFLOW; 8554 goto out; 8555 } 8556 status = -EBUSY; 8557 break; 8558 case -NFS4ERR_RECALLCONFLICT: 8559 status = -ERECALLCONFLICT; 8560 break; 8561 case -NFS4ERR_DELEG_REVOKED: 8562 case -NFS4ERR_ADMIN_REVOKED: 8563 case -NFS4ERR_EXPIRED: 8564 case -NFS4ERR_BAD_STATEID: 8565 exception->timeout = 0; 8566 spin_lock(&inode->i_lock); 8567 lo = NFS_I(inode)->layout; 8568 /* If the open stateid was bad, then recover it. */ 8569 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 8570 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 8571 spin_unlock(&inode->i_lock); 8572 exception->state = lgp->args.ctx->state; 8573 exception->stateid = &lgp->args.stateid; 8574 break; 8575 } 8576 8577 /* 8578 * Mark the bad layout state as invalid, then retry 8579 */ 8580 pnfs_mark_layout_stateid_invalid(lo, &head); 8581 spin_unlock(&inode->i_lock); 8582 nfs_commit_inode(inode, 0); 8583 pnfs_free_lseg_list(&head); 8584 status = -EAGAIN; 8585 goto out; 8586 } 8587 8588 nfs4_sequence_free_slot(&lgp->res.seq_res); 8589 err = nfs4_handle_exception(server, nfs4err, exception); 8590 if (!status) { 8591 if (exception->retry) 8592 status = -EAGAIN; 8593 else 8594 status = err; 8595 } 8596 out: 8597 dprintk("<-- %s\n", __func__); 8598 return status; 8599 } 8600 8601 static size_t max_response_pages(struct nfs_server *server) 8602 { 8603 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 8604 return nfs_page_array_len(0, max_resp_sz); 8605 } 8606 8607 static void nfs4_free_pages(struct page **pages, size_t size) 8608 { 8609 int i; 8610 8611 if (!pages) 8612 return; 8613 8614 for (i = 0; i < size; i++) { 8615 if (!pages[i]) 8616 break; 8617 __free_page(pages[i]); 8618 } 8619 kfree(pages); 8620 } 8621 8622 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 8623 { 8624 struct page **pages; 8625 int i; 8626 8627 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 8628 if (!pages) { 8629 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 8630 return NULL; 8631 } 8632 8633 for (i = 0; i < size; i++) { 8634 pages[i] = alloc_page(gfp_flags); 8635 if (!pages[i]) { 8636 dprintk("%s: failed to allocate page\n", __func__); 8637 nfs4_free_pages(pages, size); 8638 return NULL; 8639 } 8640 } 8641 8642 return pages; 8643 } 8644 8645 static void nfs4_layoutget_release(void *calldata) 8646 { 8647 struct nfs4_layoutget *lgp = calldata; 8648 struct inode *inode = lgp->args.inode; 8649 struct nfs_server *server = NFS_SERVER(inode); 8650 size_t max_pages = max_response_pages(server); 8651 8652 dprintk("--> %s\n", __func__); 8653 nfs4_sequence_free_slot(&lgp->res.seq_res); 8654 nfs4_free_pages(lgp->args.layout.pages, max_pages); 8655 pnfs_put_layout_hdr(NFS_I(inode)->layout); 8656 put_nfs_open_context(lgp->args.ctx); 8657 kfree(calldata); 8658 dprintk("<-- %s\n", __func__); 8659 } 8660 8661 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 8662 .rpc_call_prepare = nfs4_layoutget_prepare, 8663 .rpc_call_done = nfs4_layoutget_done, 8664 .rpc_release = nfs4_layoutget_release, 8665 }; 8666 8667 struct pnfs_layout_segment * 8668 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags) 8669 { 8670 struct inode *inode = lgp->args.inode; 8671 struct nfs_server *server = NFS_SERVER(inode); 8672 size_t max_pages = max_response_pages(server); 8673 struct rpc_task *task; 8674 struct rpc_message msg = { 8675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 8676 .rpc_argp = &lgp->args, 8677 .rpc_resp = &lgp->res, 8678 .rpc_cred = lgp->cred, 8679 }; 8680 struct rpc_task_setup task_setup_data = { 8681 .rpc_client = server->client, 8682 .rpc_message = &msg, 8683 .callback_ops = &nfs4_layoutget_call_ops, 8684 .callback_data = lgp, 8685 .flags = RPC_TASK_ASYNC, 8686 }; 8687 struct pnfs_layout_segment *lseg = NULL; 8688 struct nfs4_exception exception = { 8689 .inode = inode, 8690 .timeout = *timeout, 8691 }; 8692 int status = 0; 8693 8694 dprintk("--> %s\n", __func__); 8695 8696 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 8697 pnfs_get_layout_hdr(NFS_I(inode)->layout); 8698 8699 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 8700 if (!lgp->args.layout.pages) { 8701 nfs4_layoutget_release(lgp); 8702 return ERR_PTR(-ENOMEM); 8703 } 8704 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 8705 8706 lgp->res.layoutp = &lgp->args.layout; 8707 lgp->res.seq_res.sr_slot = NULL; 8708 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 8709 8710 task = rpc_run_task(&task_setup_data); 8711 if (IS_ERR(task)) 8712 return ERR_CAST(task); 8713 status = rpc_wait_for_completion_task(task); 8714 if (status == 0) { 8715 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 8716 *timeout = exception.timeout; 8717 } 8718 8719 trace_nfs4_layoutget(lgp->args.ctx, 8720 &lgp->args.range, 8721 &lgp->res.range, 8722 &lgp->res.stateid, 8723 status); 8724 8725 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 8726 if (status == 0 && lgp->res.layoutp->len) 8727 lseg = pnfs_layout_process(lgp); 8728 rpc_put_task(task); 8729 dprintk("<-- %s status=%d\n", __func__, status); 8730 if (status) 8731 return ERR_PTR(status); 8732 return lseg; 8733 } 8734 8735 static void 8736 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 8737 { 8738 struct nfs4_layoutreturn *lrp = calldata; 8739 8740 dprintk("--> %s\n", __func__); 8741 nfs4_setup_sequence(lrp->clp, 8742 &lrp->args.seq_args, 8743 &lrp->res.seq_res, 8744 task); 8745 } 8746 8747 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 8748 { 8749 struct nfs4_layoutreturn *lrp = calldata; 8750 struct nfs_server *server; 8751 8752 dprintk("--> %s\n", __func__); 8753 8754 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 8755 return; 8756 8757 server = NFS_SERVER(lrp->args.inode); 8758 switch (task->tk_status) { 8759 case -NFS4ERR_OLD_STATEID: 8760 if (nfs4_refresh_layout_stateid(&lrp->args.stateid, 8761 lrp->args.inode)) 8762 goto out_restart; 8763 /* Fallthrough */ 8764 default: 8765 task->tk_status = 0; 8766 /* Fallthrough */ 8767 case 0: 8768 break; 8769 case -NFS4ERR_DELAY: 8770 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 8771 break; 8772 goto out_restart; 8773 } 8774 dprintk("<-- %s\n", __func__); 8775 return; 8776 out_restart: 8777 task->tk_status = 0; 8778 nfs4_sequence_free_slot(&lrp->res.seq_res); 8779 rpc_restart_call_prepare(task); 8780 } 8781 8782 static void nfs4_layoutreturn_release(void *calldata) 8783 { 8784 struct nfs4_layoutreturn *lrp = calldata; 8785 struct pnfs_layout_hdr *lo = lrp->args.layout; 8786 8787 dprintk("--> %s\n", __func__); 8788 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 8789 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 8790 nfs4_sequence_free_slot(&lrp->res.seq_res); 8791 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 8792 lrp->ld_private.ops->free(&lrp->ld_private); 8793 pnfs_put_layout_hdr(lrp->args.layout); 8794 nfs_iput_and_deactive(lrp->inode); 8795 kfree(calldata); 8796 dprintk("<-- %s\n", __func__); 8797 } 8798 8799 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 8800 .rpc_call_prepare = nfs4_layoutreturn_prepare, 8801 .rpc_call_done = nfs4_layoutreturn_done, 8802 .rpc_release = nfs4_layoutreturn_release, 8803 }; 8804 8805 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 8806 { 8807 struct rpc_task *task; 8808 struct rpc_message msg = { 8809 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 8810 .rpc_argp = &lrp->args, 8811 .rpc_resp = &lrp->res, 8812 .rpc_cred = lrp->cred, 8813 }; 8814 struct rpc_task_setup task_setup_data = { 8815 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 8816 .rpc_message = &msg, 8817 .callback_ops = &nfs4_layoutreturn_call_ops, 8818 .callback_data = lrp, 8819 }; 8820 int status = 0; 8821 8822 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 8823 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 8824 &task_setup_data.rpc_client, &msg); 8825 8826 dprintk("--> %s\n", __func__); 8827 if (!sync) { 8828 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 8829 if (!lrp->inode) { 8830 nfs4_layoutreturn_release(lrp); 8831 return -EAGAIN; 8832 } 8833 task_setup_data.flags |= RPC_TASK_ASYNC; 8834 } 8835 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 8836 task = rpc_run_task(&task_setup_data); 8837 if (IS_ERR(task)) 8838 return PTR_ERR(task); 8839 if (sync) 8840 status = task->tk_status; 8841 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 8842 dprintk("<-- %s status=%d\n", __func__, status); 8843 rpc_put_task(task); 8844 return status; 8845 } 8846 8847 static int 8848 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 8849 struct pnfs_device *pdev, 8850 struct rpc_cred *cred) 8851 { 8852 struct nfs4_getdeviceinfo_args args = { 8853 .pdev = pdev, 8854 .notify_types = NOTIFY_DEVICEID4_CHANGE | 8855 NOTIFY_DEVICEID4_DELETE, 8856 }; 8857 struct nfs4_getdeviceinfo_res res = { 8858 .pdev = pdev, 8859 }; 8860 struct rpc_message msg = { 8861 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 8862 .rpc_argp = &args, 8863 .rpc_resp = &res, 8864 .rpc_cred = cred, 8865 }; 8866 int status; 8867 8868 dprintk("--> %s\n", __func__); 8869 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 8870 if (res.notification & ~args.notify_types) 8871 dprintk("%s: unsupported notification\n", __func__); 8872 if (res.notification != args.notify_types) 8873 pdev->nocache = 1; 8874 8875 dprintk("<-- %s status=%d\n", __func__, status); 8876 8877 return status; 8878 } 8879 8880 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 8881 struct pnfs_device *pdev, 8882 struct rpc_cred *cred) 8883 { 8884 struct nfs4_exception exception = { }; 8885 int err; 8886 8887 do { 8888 err = nfs4_handle_exception(server, 8889 _nfs4_proc_getdeviceinfo(server, pdev, cred), 8890 &exception); 8891 } while (exception.retry); 8892 return err; 8893 } 8894 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 8895 8896 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 8897 { 8898 struct nfs4_layoutcommit_data *data = calldata; 8899 struct nfs_server *server = NFS_SERVER(data->args.inode); 8900 8901 nfs4_setup_sequence(server->nfs_client, 8902 &data->args.seq_args, 8903 &data->res.seq_res, 8904 task); 8905 } 8906 8907 static void 8908 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 8909 { 8910 struct nfs4_layoutcommit_data *data = calldata; 8911 struct nfs_server *server = NFS_SERVER(data->args.inode); 8912 8913 if (!nfs41_sequence_done(task, &data->res.seq_res)) 8914 return; 8915 8916 switch (task->tk_status) { /* Just ignore these failures */ 8917 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 8918 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 8919 case -NFS4ERR_BADLAYOUT: /* no layout */ 8920 case -NFS4ERR_GRACE: /* loca_recalim always false */ 8921 task->tk_status = 0; 8922 case 0: 8923 break; 8924 default: 8925 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 8926 rpc_restart_call_prepare(task); 8927 return; 8928 } 8929 } 8930 } 8931 8932 static void nfs4_layoutcommit_release(void *calldata) 8933 { 8934 struct nfs4_layoutcommit_data *data = calldata; 8935 8936 pnfs_cleanup_layoutcommit(data); 8937 nfs_post_op_update_inode_force_wcc(data->args.inode, 8938 data->res.fattr); 8939 put_rpccred(data->cred); 8940 nfs_iput_and_deactive(data->inode); 8941 kfree(data); 8942 } 8943 8944 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 8945 .rpc_call_prepare = nfs4_layoutcommit_prepare, 8946 .rpc_call_done = nfs4_layoutcommit_done, 8947 .rpc_release = nfs4_layoutcommit_release, 8948 }; 8949 8950 int 8951 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 8952 { 8953 struct rpc_message msg = { 8954 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 8955 .rpc_argp = &data->args, 8956 .rpc_resp = &data->res, 8957 .rpc_cred = data->cred, 8958 }; 8959 struct rpc_task_setup task_setup_data = { 8960 .task = &data->task, 8961 .rpc_client = NFS_CLIENT(data->args.inode), 8962 .rpc_message = &msg, 8963 .callback_ops = &nfs4_layoutcommit_ops, 8964 .callback_data = data, 8965 }; 8966 struct rpc_task *task; 8967 int status = 0; 8968 8969 dprintk("NFS: initiating layoutcommit call. sync %d " 8970 "lbw: %llu inode %lu\n", sync, 8971 data->args.lastbytewritten, 8972 data->args.inode->i_ino); 8973 8974 if (!sync) { 8975 data->inode = nfs_igrab_and_active(data->args.inode); 8976 if (data->inode == NULL) { 8977 nfs4_layoutcommit_release(data); 8978 return -EAGAIN; 8979 } 8980 task_setup_data.flags = RPC_TASK_ASYNC; 8981 } 8982 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 8983 task = rpc_run_task(&task_setup_data); 8984 if (IS_ERR(task)) 8985 return PTR_ERR(task); 8986 if (sync) 8987 status = task->tk_status; 8988 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 8989 dprintk("%s: status %d\n", __func__, status); 8990 rpc_put_task(task); 8991 return status; 8992 } 8993 8994 /** 8995 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 8996 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 8997 */ 8998 static int 8999 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9000 struct nfs_fsinfo *info, 9001 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 9002 { 9003 struct nfs41_secinfo_no_name_args args = { 9004 .style = SECINFO_STYLE_CURRENT_FH, 9005 }; 9006 struct nfs4_secinfo_res res = { 9007 .flavors = flavors, 9008 }; 9009 struct rpc_message msg = { 9010 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 9011 .rpc_argp = &args, 9012 .rpc_resp = &res, 9013 }; 9014 struct rpc_clnt *clnt = server->client; 9015 struct rpc_cred *cred = NULL; 9016 int status; 9017 9018 if (use_integrity) { 9019 clnt = server->nfs_client->cl_rpcclient; 9020 cred = nfs4_get_clid_cred(server->nfs_client); 9021 msg.rpc_cred = cred; 9022 } 9023 9024 dprintk("--> %s\n", __func__); 9025 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 9026 &res.seq_res, 0); 9027 dprintk("<-- %s status=%d\n", __func__, status); 9028 9029 if (cred) 9030 put_rpccred(cred); 9031 9032 return status; 9033 } 9034 9035 static int 9036 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9037 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 9038 { 9039 struct nfs4_exception exception = { }; 9040 int err; 9041 do { 9042 /* first try using integrity protection */ 9043 err = -NFS4ERR_WRONGSEC; 9044 9045 /* try to use integrity protection with machine cred */ 9046 if (_nfs4_is_integrity_protected(server->nfs_client)) 9047 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9048 flavors, true); 9049 9050 /* 9051 * if unable to use integrity protection, or SECINFO with 9052 * integrity protection returns NFS4ERR_WRONGSEC (which is 9053 * disallowed by spec, but exists in deployed servers) use 9054 * the current filesystem's rpc_client and the user cred. 9055 */ 9056 if (err == -NFS4ERR_WRONGSEC) 9057 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9058 flavors, false); 9059 9060 switch (err) { 9061 case 0: 9062 case -NFS4ERR_WRONGSEC: 9063 case -ENOTSUPP: 9064 goto out; 9065 default: 9066 err = nfs4_handle_exception(server, err, &exception); 9067 } 9068 } while (exception.retry); 9069 out: 9070 return err; 9071 } 9072 9073 static int 9074 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 9075 struct nfs_fsinfo *info) 9076 { 9077 int err; 9078 struct page *page; 9079 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 9080 struct nfs4_secinfo_flavors *flavors; 9081 struct nfs4_secinfo4 *secinfo; 9082 int i; 9083 9084 page = alloc_page(GFP_KERNEL); 9085 if (!page) { 9086 err = -ENOMEM; 9087 goto out; 9088 } 9089 9090 flavors = page_address(page); 9091 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 9092 9093 /* 9094 * Fall back on "guess and check" method if 9095 * the server doesn't support SECINFO_NO_NAME 9096 */ 9097 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 9098 err = nfs4_find_root_sec(server, fhandle, info); 9099 goto out_freepage; 9100 } 9101 if (err) 9102 goto out_freepage; 9103 9104 for (i = 0; i < flavors->num_flavors; i++) { 9105 secinfo = &flavors->flavors[i]; 9106 9107 switch (secinfo->flavor) { 9108 case RPC_AUTH_NULL: 9109 case RPC_AUTH_UNIX: 9110 case RPC_AUTH_GSS: 9111 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 9112 &secinfo->flavor_info); 9113 break; 9114 default: 9115 flavor = RPC_AUTH_MAXFLAVOR; 9116 break; 9117 } 9118 9119 if (!nfs_auth_info_match(&server->auth_info, flavor)) 9120 flavor = RPC_AUTH_MAXFLAVOR; 9121 9122 if (flavor != RPC_AUTH_MAXFLAVOR) { 9123 err = nfs4_lookup_root_sec(server, fhandle, 9124 info, flavor); 9125 if (!err) 9126 break; 9127 } 9128 } 9129 9130 if (flavor == RPC_AUTH_MAXFLAVOR) 9131 err = -EPERM; 9132 9133 out_freepage: 9134 put_page(page); 9135 if (err == -EACCES) 9136 return -EPERM; 9137 out: 9138 return err; 9139 } 9140 9141 static int _nfs41_test_stateid(struct nfs_server *server, 9142 nfs4_stateid *stateid, 9143 struct rpc_cred *cred) 9144 { 9145 int status; 9146 struct nfs41_test_stateid_args args = { 9147 .stateid = stateid, 9148 }; 9149 struct nfs41_test_stateid_res res; 9150 struct rpc_message msg = { 9151 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 9152 .rpc_argp = &args, 9153 .rpc_resp = &res, 9154 .rpc_cred = cred, 9155 }; 9156 struct rpc_clnt *rpc_client = server->client; 9157 9158 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9159 &rpc_client, &msg); 9160 9161 dprintk("NFS call test_stateid %p\n", stateid); 9162 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 9163 nfs4_set_sequence_privileged(&args.seq_args); 9164 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 9165 &args.seq_args, &res.seq_res); 9166 if (status != NFS_OK) { 9167 dprintk("NFS reply test_stateid: failed, %d\n", status); 9168 return status; 9169 } 9170 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 9171 return -res.status; 9172 } 9173 9174 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 9175 int err, struct nfs4_exception *exception) 9176 { 9177 exception->retry = 0; 9178 switch(err) { 9179 case -NFS4ERR_DELAY: 9180 case -NFS4ERR_RETRY_UNCACHED_REP: 9181 nfs4_handle_exception(server, err, exception); 9182 break; 9183 case -NFS4ERR_BADSESSION: 9184 case -NFS4ERR_BADSLOT: 9185 case -NFS4ERR_BAD_HIGH_SLOT: 9186 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9187 case -NFS4ERR_DEADSESSION: 9188 nfs4_do_handle_exception(server, err, exception); 9189 } 9190 } 9191 9192 /** 9193 * nfs41_test_stateid - perform a TEST_STATEID operation 9194 * 9195 * @server: server / transport on which to perform the operation 9196 * @stateid: state ID to test 9197 * @cred: credential 9198 * 9199 * Returns NFS_OK if the server recognizes that "stateid" is valid. 9200 * Otherwise a negative NFS4ERR value is returned if the operation 9201 * failed or the state ID is not currently valid. 9202 */ 9203 static int nfs41_test_stateid(struct nfs_server *server, 9204 nfs4_stateid *stateid, 9205 struct rpc_cred *cred) 9206 { 9207 struct nfs4_exception exception = { }; 9208 int err; 9209 do { 9210 err = _nfs41_test_stateid(server, stateid, cred); 9211 nfs4_handle_delay_or_session_error(server, err, &exception); 9212 } while (exception.retry); 9213 return err; 9214 } 9215 9216 struct nfs_free_stateid_data { 9217 struct nfs_server *server; 9218 struct nfs41_free_stateid_args args; 9219 struct nfs41_free_stateid_res res; 9220 }; 9221 9222 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 9223 { 9224 struct nfs_free_stateid_data *data = calldata; 9225 nfs4_setup_sequence(data->server->nfs_client, 9226 &data->args.seq_args, 9227 &data->res.seq_res, 9228 task); 9229 } 9230 9231 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 9232 { 9233 struct nfs_free_stateid_data *data = calldata; 9234 9235 nfs41_sequence_done(task, &data->res.seq_res); 9236 9237 switch (task->tk_status) { 9238 case -NFS4ERR_DELAY: 9239 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 9240 rpc_restart_call_prepare(task); 9241 } 9242 } 9243 9244 static void nfs41_free_stateid_release(void *calldata) 9245 { 9246 kfree(calldata); 9247 } 9248 9249 static const struct rpc_call_ops nfs41_free_stateid_ops = { 9250 .rpc_call_prepare = nfs41_free_stateid_prepare, 9251 .rpc_call_done = nfs41_free_stateid_done, 9252 .rpc_release = nfs41_free_stateid_release, 9253 }; 9254 9255 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 9256 const nfs4_stateid *stateid, 9257 struct rpc_cred *cred, 9258 bool privileged) 9259 { 9260 struct rpc_message msg = { 9261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 9262 .rpc_cred = cred, 9263 }; 9264 struct rpc_task_setup task_setup = { 9265 .rpc_client = server->client, 9266 .rpc_message = &msg, 9267 .callback_ops = &nfs41_free_stateid_ops, 9268 .flags = RPC_TASK_ASYNC, 9269 }; 9270 struct nfs_free_stateid_data *data; 9271 9272 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9273 &task_setup.rpc_client, &msg); 9274 9275 dprintk("NFS call free_stateid %p\n", stateid); 9276 data = kmalloc(sizeof(*data), GFP_NOFS); 9277 if (!data) 9278 return ERR_PTR(-ENOMEM); 9279 data->server = server; 9280 nfs4_stateid_copy(&data->args.stateid, stateid); 9281 9282 task_setup.callback_data = data; 9283 9284 msg.rpc_argp = &data->args; 9285 msg.rpc_resp = &data->res; 9286 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 9287 if (privileged) 9288 nfs4_set_sequence_privileged(&data->args.seq_args); 9289 9290 return rpc_run_task(&task_setup); 9291 } 9292 9293 /** 9294 * nfs41_free_stateid - perform a FREE_STATEID operation 9295 * 9296 * @server: server / transport on which to perform the operation 9297 * @stateid: state ID to release 9298 * @cred: credential 9299 * @is_recovery: set to true if this call needs to be privileged 9300 * 9301 * Note: this function is always asynchronous. 9302 */ 9303 static int nfs41_free_stateid(struct nfs_server *server, 9304 const nfs4_stateid *stateid, 9305 struct rpc_cred *cred, 9306 bool is_recovery) 9307 { 9308 struct rpc_task *task; 9309 9310 task = _nfs41_free_stateid(server, stateid, cred, is_recovery); 9311 if (IS_ERR(task)) 9312 return PTR_ERR(task); 9313 rpc_put_task(task); 9314 return 0; 9315 } 9316 9317 static void 9318 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 9319 { 9320 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 9321 9322 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 9323 nfs4_free_lock_state(server, lsp); 9324 } 9325 9326 static bool nfs41_match_stateid(const nfs4_stateid *s1, 9327 const nfs4_stateid *s2) 9328 { 9329 if (s1->type != s2->type) 9330 return false; 9331 9332 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 9333 return false; 9334 9335 if (s1->seqid == s2->seqid) 9336 return true; 9337 9338 return s1->seqid == 0 || s2->seqid == 0; 9339 } 9340 9341 #endif /* CONFIG_NFS_V4_1 */ 9342 9343 static bool nfs4_match_stateid(const nfs4_stateid *s1, 9344 const nfs4_stateid *s2) 9345 { 9346 return nfs4_stateid_match(s1, s2); 9347 } 9348 9349 9350 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 9351 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9352 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9353 .recover_open = nfs4_open_reclaim, 9354 .recover_lock = nfs4_lock_reclaim, 9355 .establish_clid = nfs4_init_clientid, 9356 .detect_trunking = nfs40_discover_server_trunking, 9357 }; 9358 9359 #if defined(CONFIG_NFS_V4_1) 9360 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 9361 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9362 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9363 .recover_open = nfs4_open_reclaim, 9364 .recover_lock = nfs4_lock_reclaim, 9365 .establish_clid = nfs41_init_clientid, 9366 .reclaim_complete = nfs41_proc_reclaim_complete, 9367 .detect_trunking = nfs41_discover_server_trunking, 9368 }; 9369 #endif /* CONFIG_NFS_V4_1 */ 9370 9371 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 9372 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9373 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9374 .recover_open = nfs40_open_expired, 9375 .recover_lock = nfs4_lock_expired, 9376 .establish_clid = nfs4_init_clientid, 9377 }; 9378 9379 #if defined(CONFIG_NFS_V4_1) 9380 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 9381 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9382 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9383 .recover_open = nfs41_open_expired, 9384 .recover_lock = nfs41_lock_expired, 9385 .establish_clid = nfs41_init_clientid, 9386 }; 9387 #endif /* CONFIG_NFS_V4_1 */ 9388 9389 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 9390 .sched_state_renewal = nfs4_proc_async_renew, 9391 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 9392 .renew_lease = nfs4_proc_renew, 9393 }; 9394 9395 #if defined(CONFIG_NFS_V4_1) 9396 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 9397 .sched_state_renewal = nfs41_proc_async_sequence, 9398 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 9399 .renew_lease = nfs4_proc_sequence, 9400 }; 9401 #endif 9402 9403 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 9404 .get_locations = _nfs40_proc_get_locations, 9405 .fsid_present = _nfs40_proc_fsid_present, 9406 }; 9407 9408 #if defined(CONFIG_NFS_V4_1) 9409 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 9410 .get_locations = _nfs41_proc_get_locations, 9411 .fsid_present = _nfs41_proc_fsid_present, 9412 }; 9413 #endif /* CONFIG_NFS_V4_1 */ 9414 9415 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 9416 .minor_version = 0, 9417 .init_caps = NFS_CAP_READDIRPLUS 9418 | NFS_CAP_ATOMIC_OPEN 9419 | NFS_CAP_POSIX_LOCK, 9420 .init_client = nfs40_init_client, 9421 .shutdown_client = nfs40_shutdown_client, 9422 .match_stateid = nfs4_match_stateid, 9423 .find_root_sec = nfs4_find_root_sec, 9424 .free_lock_state = nfs4_release_lockowner, 9425 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 9426 .alloc_seqid = nfs_alloc_seqid, 9427 .call_sync_ops = &nfs40_call_sync_ops, 9428 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 9429 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 9430 .state_renewal_ops = &nfs40_state_renewal_ops, 9431 .mig_recovery_ops = &nfs40_mig_recovery_ops, 9432 }; 9433 9434 #if defined(CONFIG_NFS_V4_1) 9435 static struct nfs_seqid * 9436 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 9437 { 9438 return NULL; 9439 } 9440 9441 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 9442 .minor_version = 1, 9443 .init_caps = NFS_CAP_READDIRPLUS 9444 | NFS_CAP_ATOMIC_OPEN 9445 | NFS_CAP_POSIX_LOCK 9446 | NFS_CAP_STATEID_NFSV41 9447 | NFS_CAP_ATOMIC_OPEN_V1, 9448 .init_client = nfs41_init_client, 9449 .shutdown_client = nfs41_shutdown_client, 9450 .match_stateid = nfs41_match_stateid, 9451 .find_root_sec = nfs41_find_root_sec, 9452 .free_lock_state = nfs41_free_lock_state, 9453 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9454 .alloc_seqid = nfs_alloc_no_seqid, 9455 .session_trunk = nfs4_test_session_trunk, 9456 .call_sync_ops = &nfs41_call_sync_ops, 9457 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9458 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9459 .state_renewal_ops = &nfs41_state_renewal_ops, 9460 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9461 }; 9462 #endif 9463 9464 #if defined(CONFIG_NFS_V4_2) 9465 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 9466 .minor_version = 2, 9467 .init_caps = NFS_CAP_READDIRPLUS 9468 | NFS_CAP_ATOMIC_OPEN 9469 | NFS_CAP_POSIX_LOCK 9470 | NFS_CAP_STATEID_NFSV41 9471 | NFS_CAP_ATOMIC_OPEN_V1 9472 | NFS_CAP_ALLOCATE 9473 | NFS_CAP_COPY 9474 | NFS_CAP_DEALLOCATE 9475 | NFS_CAP_SEEK 9476 | NFS_CAP_LAYOUTSTATS 9477 | NFS_CAP_CLONE, 9478 .init_client = nfs41_init_client, 9479 .shutdown_client = nfs41_shutdown_client, 9480 .match_stateid = nfs41_match_stateid, 9481 .find_root_sec = nfs41_find_root_sec, 9482 .free_lock_state = nfs41_free_lock_state, 9483 .call_sync_ops = &nfs41_call_sync_ops, 9484 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9485 .alloc_seqid = nfs_alloc_no_seqid, 9486 .session_trunk = nfs4_test_session_trunk, 9487 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9488 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9489 .state_renewal_ops = &nfs41_state_renewal_ops, 9490 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9491 }; 9492 #endif 9493 9494 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 9495 [0] = &nfs_v4_0_minor_ops, 9496 #if defined(CONFIG_NFS_V4_1) 9497 [1] = &nfs_v4_1_minor_ops, 9498 #endif 9499 #if defined(CONFIG_NFS_V4_2) 9500 [2] = &nfs_v4_2_minor_ops, 9501 #endif 9502 }; 9503 9504 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 9505 { 9506 ssize_t error, error2; 9507 9508 error = generic_listxattr(dentry, list, size); 9509 if (error < 0) 9510 return error; 9511 if (list) { 9512 list += error; 9513 size -= error; 9514 } 9515 9516 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 9517 if (error2 < 0) 9518 return error2; 9519 return error + error2; 9520 } 9521 9522 static const struct inode_operations nfs4_dir_inode_operations = { 9523 .create = nfs_create, 9524 .lookup = nfs_lookup, 9525 .atomic_open = nfs_atomic_open, 9526 .link = nfs_link, 9527 .unlink = nfs_unlink, 9528 .symlink = nfs_symlink, 9529 .mkdir = nfs_mkdir, 9530 .rmdir = nfs_rmdir, 9531 .mknod = nfs_mknod, 9532 .rename = nfs_rename, 9533 .permission = nfs_permission, 9534 .getattr = nfs_getattr, 9535 .setattr = nfs_setattr, 9536 .listxattr = nfs4_listxattr, 9537 }; 9538 9539 static const struct inode_operations nfs4_file_inode_operations = { 9540 .permission = nfs_permission, 9541 .getattr = nfs_getattr, 9542 .setattr = nfs_setattr, 9543 .listxattr = nfs4_listxattr, 9544 }; 9545 9546 const struct nfs_rpc_ops nfs_v4_clientops = { 9547 .version = 4, /* protocol version */ 9548 .dentry_ops = &nfs4_dentry_operations, 9549 .dir_inode_ops = &nfs4_dir_inode_operations, 9550 .file_inode_ops = &nfs4_file_inode_operations, 9551 .file_ops = &nfs4_file_operations, 9552 .getroot = nfs4_proc_get_root, 9553 .submount = nfs4_submount, 9554 .try_mount = nfs4_try_mount, 9555 .getattr = nfs4_proc_getattr, 9556 .setattr = nfs4_proc_setattr, 9557 .lookup = nfs4_proc_lookup, 9558 .lookupp = nfs4_proc_lookupp, 9559 .access = nfs4_proc_access, 9560 .readlink = nfs4_proc_readlink, 9561 .create = nfs4_proc_create, 9562 .remove = nfs4_proc_remove, 9563 .unlink_setup = nfs4_proc_unlink_setup, 9564 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 9565 .unlink_done = nfs4_proc_unlink_done, 9566 .rename_setup = nfs4_proc_rename_setup, 9567 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 9568 .rename_done = nfs4_proc_rename_done, 9569 .link = nfs4_proc_link, 9570 .symlink = nfs4_proc_symlink, 9571 .mkdir = nfs4_proc_mkdir, 9572 .rmdir = nfs4_proc_remove, 9573 .readdir = nfs4_proc_readdir, 9574 .mknod = nfs4_proc_mknod, 9575 .statfs = nfs4_proc_statfs, 9576 .fsinfo = nfs4_proc_fsinfo, 9577 .pathconf = nfs4_proc_pathconf, 9578 .set_capabilities = nfs4_server_capabilities, 9579 .decode_dirent = nfs4_decode_dirent, 9580 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 9581 .read_setup = nfs4_proc_read_setup, 9582 .read_done = nfs4_read_done, 9583 .write_setup = nfs4_proc_write_setup, 9584 .write_done = nfs4_write_done, 9585 .commit_setup = nfs4_proc_commit_setup, 9586 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 9587 .commit_done = nfs4_commit_done, 9588 .lock = nfs4_proc_lock, 9589 .clear_acl_cache = nfs4_zap_acl_attr, 9590 .close_context = nfs4_close_context, 9591 .open_context = nfs4_atomic_open, 9592 .have_delegation = nfs4_have_delegation, 9593 .return_delegation = nfs4_inode_return_delegation, 9594 .alloc_client = nfs4_alloc_client, 9595 .init_client = nfs4_init_client, 9596 .free_client = nfs4_free_client, 9597 .create_server = nfs4_create_server, 9598 .clone_server = nfs_clone_server, 9599 }; 9600 9601 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 9602 .name = XATTR_NAME_NFSV4_ACL, 9603 .list = nfs4_xattr_list_nfs4_acl, 9604 .get = nfs4_xattr_get_nfs4_acl, 9605 .set = nfs4_xattr_set_nfs4_acl, 9606 }; 9607 9608 const struct xattr_handler *nfs4_xattr_handlers[] = { 9609 &nfs4_xattr_nfs4_acl_handler, 9610 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 9611 &nfs4_xattr_nfs4_label_handler, 9612 #endif 9613 NULL 9614 }; 9615 9616 /* 9617 * Local variables: 9618 * c-basic-offset: 8 9619 * End: 9620 */ 9621