1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "nfs4idmap.h" 67 #include "nfs4session.h" 68 #include "fscache.h" 69 70 #include "nfs4trace.h" 71 72 #define NFSDBG_FACILITY NFSDBG_PROC 73 74 #define NFS4_POLL_RETRY_MIN (HZ/10) 75 #define NFS4_POLL_RETRY_MAX (15*HZ) 76 77 /* file attributes which can be mapped to nfs attributes */ 78 #define NFS4_VALID_ATTRS (ATTR_MODE \ 79 | ATTR_UID \ 80 | ATTR_GID \ 81 | ATTR_SIZE \ 82 | ATTR_ATIME \ 83 | ATTR_MTIME \ 84 | ATTR_CTIME \ 85 | ATTR_ATIME_SET \ 86 | ATTR_MTIME_SET) 87 88 struct nfs4_opendata; 89 static int _nfs4_proc_open(struct nfs4_opendata *data); 90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label); 94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label); 95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 96 struct nfs_fattr *fattr, struct iattr *sattr, 97 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 98 struct nfs4_label *olabel); 99 #ifdef CONFIG_NFS_V4_1 100 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 101 struct rpc_cred *cred, 102 struct nfs4_slot *slot, 103 bool is_privileged); 104 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 105 struct rpc_cred *); 106 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 107 struct rpc_cred *, bool); 108 #endif 109 110 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 111 static inline struct nfs4_label * 112 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 113 struct iattr *sattr, struct nfs4_label *label) 114 { 115 int err; 116 117 if (label == NULL) 118 return NULL; 119 120 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 121 return NULL; 122 123 err = security_dentry_init_security(dentry, sattr->ia_mode, 124 &dentry->d_name, (void **)&label->label, &label->len); 125 if (err == 0) 126 return label; 127 128 return NULL; 129 } 130 static inline void 131 nfs4_label_release_security(struct nfs4_label *label) 132 { 133 if (label) 134 security_release_secctx(label->label, label->len); 135 } 136 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 137 { 138 if (label) 139 return server->attr_bitmask; 140 141 return server->attr_bitmask_nl; 142 } 143 #else 144 static inline struct nfs4_label * 145 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 146 struct iattr *sattr, struct nfs4_label *l) 147 { return NULL; } 148 static inline void 149 nfs4_label_release_security(struct nfs4_label *label) 150 { return; } 151 static inline u32 * 152 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 153 { return server->attr_bitmask; } 154 #endif 155 156 /* Prevent leaks of NFSv4 errors into userland */ 157 static int nfs4_map_errors(int err) 158 { 159 if (err >= -1000) 160 return err; 161 switch (err) { 162 case -NFS4ERR_RESOURCE: 163 case -NFS4ERR_LAYOUTTRYLATER: 164 case -NFS4ERR_RECALLCONFLICT: 165 return -EREMOTEIO; 166 case -NFS4ERR_WRONGSEC: 167 case -NFS4ERR_WRONG_CRED: 168 return -EPERM; 169 case -NFS4ERR_BADOWNER: 170 case -NFS4ERR_BADNAME: 171 return -EINVAL; 172 case -NFS4ERR_SHARE_DENIED: 173 return -EACCES; 174 case -NFS4ERR_MINOR_VERS_MISMATCH: 175 return -EPROTONOSUPPORT; 176 case -NFS4ERR_FILE_OPEN: 177 return -EBUSY; 178 default: 179 dprintk("%s could not handle NFSv4 error %d\n", 180 __func__, -err); 181 break; 182 } 183 return -EIO; 184 } 185 186 /* 187 * This is our standard bitmap for GETATTR requests. 188 */ 189 const u32 nfs4_fattr_bitmap[3] = { 190 FATTR4_WORD0_TYPE 191 | FATTR4_WORD0_CHANGE 192 | FATTR4_WORD0_SIZE 193 | FATTR4_WORD0_FSID 194 | FATTR4_WORD0_FILEID, 195 FATTR4_WORD1_MODE 196 | FATTR4_WORD1_NUMLINKS 197 | FATTR4_WORD1_OWNER 198 | FATTR4_WORD1_OWNER_GROUP 199 | FATTR4_WORD1_RAWDEV 200 | FATTR4_WORD1_SPACE_USED 201 | FATTR4_WORD1_TIME_ACCESS 202 | FATTR4_WORD1_TIME_METADATA 203 | FATTR4_WORD1_TIME_MODIFY 204 | FATTR4_WORD1_MOUNTED_ON_FILEID, 205 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 206 FATTR4_WORD2_SECURITY_LABEL 207 #endif 208 }; 209 210 static const u32 nfs4_pnfs_open_bitmap[3] = { 211 FATTR4_WORD0_TYPE 212 | FATTR4_WORD0_CHANGE 213 | FATTR4_WORD0_SIZE 214 | FATTR4_WORD0_FSID 215 | FATTR4_WORD0_FILEID, 216 FATTR4_WORD1_MODE 217 | FATTR4_WORD1_NUMLINKS 218 | FATTR4_WORD1_OWNER 219 | FATTR4_WORD1_OWNER_GROUP 220 | FATTR4_WORD1_RAWDEV 221 | FATTR4_WORD1_SPACE_USED 222 | FATTR4_WORD1_TIME_ACCESS 223 | FATTR4_WORD1_TIME_METADATA 224 | FATTR4_WORD1_TIME_MODIFY, 225 FATTR4_WORD2_MDSTHRESHOLD 226 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 227 | FATTR4_WORD2_SECURITY_LABEL 228 #endif 229 }; 230 231 static const u32 nfs4_open_noattr_bitmap[3] = { 232 FATTR4_WORD0_TYPE 233 | FATTR4_WORD0_FILEID, 234 }; 235 236 const u32 nfs4_statfs_bitmap[3] = { 237 FATTR4_WORD0_FILES_AVAIL 238 | FATTR4_WORD0_FILES_FREE 239 | FATTR4_WORD0_FILES_TOTAL, 240 FATTR4_WORD1_SPACE_AVAIL 241 | FATTR4_WORD1_SPACE_FREE 242 | FATTR4_WORD1_SPACE_TOTAL 243 }; 244 245 const u32 nfs4_pathconf_bitmap[3] = { 246 FATTR4_WORD0_MAXLINK 247 | FATTR4_WORD0_MAXNAME, 248 0 249 }; 250 251 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 252 | FATTR4_WORD0_MAXREAD 253 | FATTR4_WORD0_MAXWRITE 254 | FATTR4_WORD0_LEASE_TIME, 255 FATTR4_WORD1_TIME_DELTA 256 | FATTR4_WORD1_FS_LAYOUT_TYPES, 257 FATTR4_WORD2_LAYOUT_BLKSIZE 258 | FATTR4_WORD2_CLONE_BLKSIZE 259 }; 260 261 const u32 nfs4_fs_locations_bitmap[3] = { 262 FATTR4_WORD0_CHANGE 263 | FATTR4_WORD0_SIZE 264 | FATTR4_WORD0_FSID 265 | FATTR4_WORD0_FILEID 266 | FATTR4_WORD0_FS_LOCATIONS, 267 FATTR4_WORD1_OWNER 268 | FATTR4_WORD1_OWNER_GROUP 269 | FATTR4_WORD1_RAWDEV 270 | FATTR4_WORD1_SPACE_USED 271 | FATTR4_WORD1_TIME_ACCESS 272 | FATTR4_WORD1_TIME_METADATA 273 | FATTR4_WORD1_TIME_MODIFY 274 | FATTR4_WORD1_MOUNTED_ON_FILEID, 275 }; 276 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 278 struct nfs4_readdir_arg *readdir) 279 { 280 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 281 __be32 *start, *p; 282 283 if (cookie > 2) { 284 readdir->cookie = cookie; 285 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 286 return; 287 } 288 289 readdir->cookie = 0; 290 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 291 if (cookie == 2) 292 return; 293 294 /* 295 * NFSv4 servers do not return entries for '.' and '..' 296 * Therefore, we fake these entries here. We let '.' 297 * have cookie 0 and '..' have cookie 1. Note that 298 * when talking to the server, we always send cookie 0 299 * instead of 1 or 2. 300 */ 301 start = p = kmap_atomic(*readdir->pages); 302 303 if (cookie == 0) { 304 *p++ = xdr_one; /* next */ 305 *p++ = xdr_zero; /* cookie, first word */ 306 *p++ = xdr_one; /* cookie, second word */ 307 *p++ = xdr_one; /* entry len */ 308 memcpy(p, ".\0\0\0", 4); /* entry */ 309 p++; 310 *p++ = xdr_one; /* bitmap length */ 311 *p++ = htonl(attrs); /* bitmap */ 312 *p++ = htonl(12); /* attribute buffer length */ 313 *p++ = htonl(NF4DIR); 314 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 315 } 316 317 *p++ = xdr_one; /* next */ 318 *p++ = xdr_zero; /* cookie, first word */ 319 *p++ = xdr_two; /* cookie, second word */ 320 *p++ = xdr_two; /* entry len */ 321 memcpy(p, "..\0\0", 4); /* entry */ 322 p++; 323 *p++ = xdr_one; /* bitmap length */ 324 *p++ = htonl(attrs); /* bitmap */ 325 *p++ = htonl(12); /* attribute buffer length */ 326 *p++ = htonl(NF4DIR); 327 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 328 329 readdir->pgbase = (char *)p - (char *)start; 330 readdir->count -= readdir->pgbase; 331 kunmap_atomic(start); 332 } 333 334 static void nfs4_test_and_free_stateid(struct nfs_server *server, 335 nfs4_stateid *stateid, 336 struct rpc_cred *cred) 337 { 338 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 339 340 ops->test_and_free_expired(server, stateid, cred); 341 } 342 343 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 344 nfs4_stateid *stateid, 345 struct rpc_cred *cred) 346 { 347 stateid->type = NFS4_REVOKED_STATEID_TYPE; 348 nfs4_test_and_free_stateid(server, stateid, cred); 349 } 350 351 static void nfs4_free_revoked_stateid(struct nfs_server *server, 352 const nfs4_stateid *stateid, 353 struct rpc_cred *cred) 354 { 355 nfs4_stateid tmp; 356 357 nfs4_stateid_copy(&tmp, stateid); 358 __nfs4_free_revoked_stateid(server, &tmp, cred); 359 } 360 361 static long nfs4_update_delay(long *timeout) 362 { 363 long ret; 364 if (!timeout) 365 return NFS4_POLL_RETRY_MAX; 366 if (*timeout <= 0) 367 *timeout = NFS4_POLL_RETRY_MIN; 368 if (*timeout > NFS4_POLL_RETRY_MAX) 369 *timeout = NFS4_POLL_RETRY_MAX; 370 ret = *timeout; 371 *timeout <<= 1; 372 return ret; 373 } 374 375 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 376 { 377 int res = 0; 378 379 might_sleep(); 380 381 freezable_schedule_timeout_killable_unsafe( 382 nfs4_update_delay(timeout)); 383 if (fatal_signal_pending(current)) 384 res = -ERESTARTSYS; 385 return res; 386 } 387 388 /* This is the error handling routine for processes that are allowed 389 * to sleep. 390 */ 391 static int nfs4_do_handle_exception(struct nfs_server *server, 392 int errorcode, struct nfs4_exception *exception) 393 { 394 struct nfs_client *clp = server->nfs_client; 395 struct nfs4_state *state = exception->state; 396 const nfs4_stateid *stateid = exception->stateid; 397 struct inode *inode = exception->inode; 398 int ret = errorcode; 399 400 exception->delay = 0; 401 exception->recovering = 0; 402 exception->retry = 0; 403 404 if (stateid == NULL && state != NULL) 405 stateid = &state->stateid; 406 407 switch(errorcode) { 408 case 0: 409 return 0; 410 case -NFS4ERR_DELEG_REVOKED: 411 case -NFS4ERR_ADMIN_REVOKED: 412 case -NFS4ERR_EXPIRED: 413 case -NFS4ERR_BAD_STATEID: 414 if (inode != NULL && stateid != NULL) { 415 nfs_inode_find_state_and_recover(inode, 416 stateid); 417 goto wait_on_recovery; 418 } 419 case -NFS4ERR_OPENMODE: 420 if (inode) { 421 int err; 422 423 err = nfs_async_inode_return_delegation(inode, 424 stateid); 425 if (err == 0) 426 goto wait_on_recovery; 427 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 428 exception->retry = 1; 429 break; 430 } 431 } 432 if (state == NULL) 433 break; 434 ret = nfs4_schedule_stateid_recovery(server, state); 435 if (ret < 0) 436 break; 437 goto wait_on_recovery; 438 case -NFS4ERR_STALE_STATEID: 439 case -NFS4ERR_STALE_CLIENTID: 440 nfs4_schedule_lease_recovery(clp); 441 goto wait_on_recovery; 442 case -NFS4ERR_MOVED: 443 ret = nfs4_schedule_migration_recovery(server); 444 if (ret < 0) 445 break; 446 goto wait_on_recovery; 447 case -NFS4ERR_LEASE_MOVED: 448 nfs4_schedule_lease_moved_recovery(clp); 449 goto wait_on_recovery; 450 #if defined(CONFIG_NFS_V4_1) 451 case -NFS4ERR_BADSESSION: 452 case -NFS4ERR_BADSLOT: 453 case -NFS4ERR_BAD_HIGH_SLOT: 454 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 455 case -NFS4ERR_DEADSESSION: 456 case -NFS4ERR_SEQ_FALSE_RETRY: 457 case -NFS4ERR_SEQ_MISORDERED: 458 dprintk("%s ERROR: %d Reset session\n", __func__, 459 errorcode); 460 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 461 goto wait_on_recovery; 462 #endif /* defined(CONFIG_NFS_V4_1) */ 463 case -NFS4ERR_FILE_OPEN: 464 if (exception->timeout > HZ) { 465 /* We have retried a decent amount, time to 466 * fail 467 */ 468 ret = -EBUSY; 469 break; 470 } 471 case -NFS4ERR_DELAY: 472 nfs_inc_server_stats(server, NFSIOS_DELAY); 473 case -NFS4ERR_GRACE: 474 case -NFS4ERR_LAYOUTTRYLATER: 475 case -NFS4ERR_RECALLCONFLICT: 476 exception->delay = 1; 477 return 0; 478 479 case -NFS4ERR_RETRY_UNCACHED_REP: 480 case -NFS4ERR_OLD_STATEID: 481 exception->retry = 1; 482 break; 483 case -NFS4ERR_BADOWNER: 484 /* The following works around a Linux server bug! */ 485 case -NFS4ERR_BADNAME: 486 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 487 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 488 exception->retry = 1; 489 printk(KERN_WARNING "NFS: v4 server %s " 490 "does not accept raw " 491 "uid/gids. " 492 "Reenabling the idmapper.\n", 493 server->nfs_client->cl_hostname); 494 } 495 } 496 /* We failed to handle the error */ 497 return nfs4_map_errors(ret); 498 wait_on_recovery: 499 exception->recovering = 1; 500 return 0; 501 } 502 503 /* This is the error handling routine for processes that are allowed 504 * to sleep. 505 */ 506 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 507 { 508 struct nfs_client *clp = server->nfs_client; 509 int ret; 510 511 ret = nfs4_do_handle_exception(server, errorcode, exception); 512 if (exception->delay) { 513 ret = nfs4_delay(server->client, &exception->timeout); 514 goto out_retry; 515 } 516 if (exception->recovering) { 517 ret = nfs4_wait_clnt_recover(clp); 518 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 519 return -EIO; 520 goto out_retry; 521 } 522 return ret; 523 out_retry: 524 if (ret == 0) 525 exception->retry = 1; 526 return ret; 527 } 528 529 static int 530 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 531 int errorcode, struct nfs4_exception *exception) 532 { 533 struct nfs_client *clp = server->nfs_client; 534 int ret; 535 536 ret = nfs4_do_handle_exception(server, errorcode, exception); 537 if (exception->delay) { 538 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 539 goto out_retry; 540 } 541 if (exception->recovering) { 542 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 543 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 544 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 545 goto out_retry; 546 } 547 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 548 ret = -EIO; 549 return ret; 550 out_retry: 551 if (ret == 0) 552 exception->retry = 1; 553 return ret; 554 } 555 556 static int 557 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 558 struct nfs4_state *state, long *timeout) 559 { 560 struct nfs4_exception exception = { 561 .state = state, 562 }; 563 564 if (task->tk_status >= 0) 565 return 0; 566 if (timeout) 567 exception.timeout = *timeout; 568 task->tk_status = nfs4_async_handle_exception(task, server, 569 task->tk_status, 570 &exception); 571 if (exception.delay && timeout) 572 *timeout = exception.timeout; 573 if (exception.retry) 574 return -EAGAIN; 575 return 0; 576 } 577 578 /* 579 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 580 * or 'false' otherwise. 581 */ 582 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 583 { 584 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 585 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 586 } 587 588 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 589 { 590 spin_lock(&clp->cl_lock); 591 if (time_before(clp->cl_last_renewal,timestamp)) 592 clp->cl_last_renewal = timestamp; 593 spin_unlock(&clp->cl_lock); 594 } 595 596 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 597 { 598 struct nfs_client *clp = server->nfs_client; 599 600 if (!nfs4_has_session(clp)) 601 do_renew_lease(clp, timestamp); 602 } 603 604 struct nfs4_call_sync_data { 605 const struct nfs_server *seq_server; 606 struct nfs4_sequence_args *seq_args; 607 struct nfs4_sequence_res *seq_res; 608 }; 609 610 void nfs4_init_sequence(struct nfs4_sequence_args *args, 611 struct nfs4_sequence_res *res, int cache_reply) 612 { 613 args->sa_slot = NULL; 614 args->sa_cache_this = cache_reply; 615 args->sa_privileged = 0; 616 617 res->sr_slot = NULL; 618 } 619 620 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 621 { 622 args->sa_privileged = 1; 623 } 624 625 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 626 { 627 struct nfs4_slot *slot = res->sr_slot; 628 struct nfs4_slot_table *tbl; 629 630 tbl = slot->table; 631 spin_lock(&tbl->slot_tbl_lock); 632 if (!nfs41_wake_and_assign_slot(tbl, slot)) 633 nfs4_free_slot(tbl, slot); 634 spin_unlock(&tbl->slot_tbl_lock); 635 636 res->sr_slot = NULL; 637 } 638 639 static int nfs40_sequence_done(struct rpc_task *task, 640 struct nfs4_sequence_res *res) 641 { 642 if (res->sr_slot != NULL) 643 nfs40_sequence_free_slot(res); 644 return 1; 645 } 646 647 #if defined(CONFIG_NFS_V4_1) 648 649 static void nfs41_release_slot(struct nfs4_slot *slot) 650 { 651 struct nfs4_session *session; 652 struct nfs4_slot_table *tbl; 653 bool send_new_highest_used_slotid = false; 654 655 if (!slot) 656 return; 657 tbl = slot->table; 658 session = tbl->session; 659 660 /* Bump the slot sequence number */ 661 if (slot->seq_done) 662 slot->seq_nr++; 663 slot->seq_done = 0; 664 665 spin_lock(&tbl->slot_tbl_lock); 666 /* Be nice to the server: try to ensure that the last transmitted 667 * value for highest_user_slotid <= target_highest_slotid 668 */ 669 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 670 send_new_highest_used_slotid = true; 671 672 if (nfs41_wake_and_assign_slot(tbl, slot)) { 673 send_new_highest_used_slotid = false; 674 goto out_unlock; 675 } 676 nfs4_free_slot(tbl, slot); 677 678 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 679 send_new_highest_used_slotid = false; 680 out_unlock: 681 spin_unlock(&tbl->slot_tbl_lock); 682 if (send_new_highest_used_slotid) 683 nfs41_notify_server(session->clp); 684 if (waitqueue_active(&tbl->slot_waitq)) 685 wake_up_all(&tbl->slot_waitq); 686 } 687 688 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 689 { 690 nfs41_release_slot(res->sr_slot); 691 res->sr_slot = NULL; 692 } 693 694 static int nfs41_sequence_process(struct rpc_task *task, 695 struct nfs4_sequence_res *res) 696 { 697 struct nfs4_session *session; 698 struct nfs4_slot *slot = res->sr_slot; 699 struct nfs_client *clp; 700 bool interrupted = false; 701 int ret = 1; 702 703 if (slot == NULL) 704 goto out_noaction; 705 /* don't increment the sequence number if the task wasn't sent */ 706 if (!RPC_WAS_SENT(task)) 707 goto out; 708 709 session = slot->table->session; 710 711 if (slot->interrupted) { 712 if (res->sr_status != -NFS4ERR_DELAY) 713 slot->interrupted = 0; 714 interrupted = true; 715 } 716 717 trace_nfs4_sequence_done(session, res); 718 /* Check the SEQUENCE operation status */ 719 switch (res->sr_status) { 720 case 0: 721 /* Update the slot's sequence and clientid lease timer */ 722 slot->seq_done = 1; 723 clp = session->clp; 724 do_renew_lease(clp, res->sr_timestamp); 725 /* Check sequence flags */ 726 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 727 !!slot->privileged); 728 nfs41_update_target_slotid(slot->table, slot, res); 729 break; 730 case 1: 731 /* 732 * sr_status remains 1 if an RPC level error occurred. 733 * The server may or may not have processed the sequence 734 * operation.. 735 * Mark the slot as having hosted an interrupted RPC call. 736 */ 737 slot->interrupted = 1; 738 goto out; 739 case -NFS4ERR_DELAY: 740 /* The server detected a resend of the RPC call and 741 * returned NFS4ERR_DELAY as per Section 2.10.6.2 742 * of RFC5661. 743 */ 744 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 745 __func__, 746 slot->slot_nr, 747 slot->seq_nr); 748 goto out_retry; 749 case -NFS4ERR_BADSLOT: 750 /* 751 * The slot id we used was probably retired. Try again 752 * using a different slot id. 753 */ 754 if (slot->seq_nr < slot->table->target_highest_slotid) 755 goto session_recover; 756 goto retry_nowait; 757 case -NFS4ERR_SEQ_MISORDERED: 758 /* 759 * Was the last operation on this sequence interrupted? 760 * If so, retry after bumping the sequence number. 761 */ 762 if (interrupted) 763 goto retry_new_seq; 764 /* 765 * Could this slot have been previously retired? 766 * If so, then the server may be expecting seq_nr = 1! 767 */ 768 if (slot->seq_nr != 1) { 769 slot->seq_nr = 1; 770 goto retry_nowait; 771 } 772 goto session_recover; 773 case -NFS4ERR_SEQ_FALSE_RETRY: 774 if (interrupted) 775 goto retry_new_seq; 776 goto session_recover; 777 default: 778 /* Just update the slot sequence no. */ 779 slot->seq_done = 1; 780 } 781 out: 782 /* The session may be reset by one of the error handlers. */ 783 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 784 out_noaction: 785 return ret; 786 session_recover: 787 nfs4_schedule_session_recovery(session, res->sr_status); 788 goto retry_nowait; 789 retry_new_seq: 790 ++slot->seq_nr; 791 retry_nowait: 792 if (rpc_restart_call_prepare(task)) { 793 nfs41_sequence_free_slot(res); 794 task->tk_status = 0; 795 ret = 0; 796 } 797 goto out; 798 out_retry: 799 if (!rpc_restart_call(task)) 800 goto out; 801 rpc_delay(task, NFS4_POLL_RETRY_MAX); 802 return 0; 803 } 804 805 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 806 { 807 if (!nfs41_sequence_process(task, res)) 808 return 0; 809 if (res->sr_slot != NULL) 810 nfs41_sequence_free_slot(res); 811 return 1; 812 813 } 814 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 815 816 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 817 { 818 if (res->sr_slot == NULL) 819 return 1; 820 if (res->sr_slot->table->session != NULL) 821 return nfs41_sequence_process(task, res); 822 return nfs40_sequence_done(task, res); 823 } 824 825 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 826 { 827 if (res->sr_slot != NULL) { 828 if (res->sr_slot->table->session != NULL) 829 nfs41_sequence_free_slot(res); 830 else 831 nfs40_sequence_free_slot(res); 832 } 833 } 834 835 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 836 { 837 if (res->sr_slot == NULL) 838 return 1; 839 if (!res->sr_slot->table->session) 840 return nfs40_sequence_done(task, res); 841 return nfs41_sequence_done(task, res); 842 } 843 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 844 845 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 846 { 847 struct nfs4_call_sync_data *data = calldata; 848 849 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 850 851 nfs4_setup_sequence(data->seq_server->nfs_client, 852 data->seq_args, data->seq_res, task); 853 } 854 855 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 856 { 857 struct nfs4_call_sync_data *data = calldata; 858 859 nfs41_sequence_done(task, data->seq_res); 860 } 861 862 static const struct rpc_call_ops nfs41_call_sync_ops = { 863 .rpc_call_prepare = nfs41_call_sync_prepare, 864 .rpc_call_done = nfs41_call_sync_done, 865 }; 866 867 static void 868 nfs4_sequence_process_interrupted(struct nfs_client *client, 869 struct nfs4_slot *slot, struct rpc_cred *cred) 870 { 871 struct rpc_task *task; 872 873 task = _nfs41_proc_sequence(client, cred, slot, true); 874 if (!IS_ERR(task)) 875 rpc_put_task_async(task); 876 } 877 878 #else /* !CONFIG_NFS_V4_1 */ 879 880 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 881 { 882 return nfs40_sequence_done(task, res); 883 } 884 885 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 886 { 887 if (res->sr_slot != NULL) 888 nfs40_sequence_free_slot(res); 889 } 890 891 int nfs4_sequence_done(struct rpc_task *task, 892 struct nfs4_sequence_res *res) 893 { 894 return nfs40_sequence_done(task, res); 895 } 896 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 897 898 static void 899 nfs4_sequence_process_interrupted(struct nfs_client *client, 900 struct nfs4_slot *slot, struct rpc_cred *cred) 901 { 902 WARN_ON_ONCE(1); 903 slot->interrupted = 0; 904 } 905 906 #endif /* !CONFIG_NFS_V4_1 */ 907 908 static 909 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 910 struct nfs4_sequence_res *res, 911 struct nfs4_slot *slot) 912 { 913 if (!slot) 914 return; 915 slot->privileged = args->sa_privileged ? 1 : 0; 916 args->sa_slot = slot; 917 918 res->sr_slot = slot; 919 res->sr_timestamp = jiffies; 920 res->sr_status_flags = 0; 921 res->sr_status = 1; 922 923 } 924 925 int nfs4_setup_sequence(struct nfs_client *client, 926 struct nfs4_sequence_args *args, 927 struct nfs4_sequence_res *res, 928 struct rpc_task *task) 929 { 930 struct nfs4_session *session = nfs4_get_session(client); 931 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 932 struct nfs4_slot *slot; 933 934 /* slot already allocated? */ 935 if (res->sr_slot != NULL) 936 goto out_start; 937 938 if (session) { 939 tbl = &session->fc_slot_table; 940 task->tk_timeout = 0; 941 } 942 943 for (;;) { 944 spin_lock(&tbl->slot_tbl_lock); 945 /* The state manager will wait until the slot table is empty */ 946 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 947 goto out_sleep; 948 949 slot = nfs4_alloc_slot(tbl); 950 if (IS_ERR(slot)) { 951 /* Try again in 1/4 second */ 952 if (slot == ERR_PTR(-ENOMEM)) 953 task->tk_timeout = HZ >> 2; 954 goto out_sleep; 955 } 956 spin_unlock(&tbl->slot_tbl_lock); 957 958 if (likely(!slot->interrupted)) 959 break; 960 nfs4_sequence_process_interrupted(client, 961 slot, task->tk_msg.rpc_cred); 962 } 963 964 nfs4_sequence_attach_slot(args, res, slot); 965 966 trace_nfs4_setup_sequence(session, args); 967 out_start: 968 rpc_call_start(task); 969 return 0; 970 971 out_sleep: 972 if (args->sa_privileged) 973 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 974 NULL, RPC_PRIORITY_PRIVILEGED); 975 else 976 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 977 spin_unlock(&tbl->slot_tbl_lock); 978 return -EAGAIN; 979 } 980 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 981 982 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 983 { 984 struct nfs4_call_sync_data *data = calldata; 985 nfs4_setup_sequence(data->seq_server->nfs_client, 986 data->seq_args, data->seq_res, task); 987 } 988 989 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 990 { 991 struct nfs4_call_sync_data *data = calldata; 992 nfs4_sequence_done(task, data->seq_res); 993 } 994 995 static const struct rpc_call_ops nfs40_call_sync_ops = { 996 .rpc_call_prepare = nfs40_call_sync_prepare, 997 .rpc_call_done = nfs40_call_sync_done, 998 }; 999 1000 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1001 struct nfs_server *server, 1002 struct rpc_message *msg, 1003 struct nfs4_sequence_args *args, 1004 struct nfs4_sequence_res *res) 1005 { 1006 int ret; 1007 struct rpc_task *task; 1008 struct nfs_client *clp = server->nfs_client; 1009 struct nfs4_call_sync_data data = { 1010 .seq_server = server, 1011 .seq_args = args, 1012 .seq_res = res, 1013 }; 1014 struct rpc_task_setup task_setup = { 1015 .rpc_client = clnt, 1016 .rpc_message = msg, 1017 .callback_ops = clp->cl_mvops->call_sync_ops, 1018 .callback_data = &data 1019 }; 1020 1021 task = rpc_run_task(&task_setup); 1022 if (IS_ERR(task)) 1023 ret = PTR_ERR(task); 1024 else { 1025 ret = task->tk_status; 1026 rpc_put_task(task); 1027 } 1028 return ret; 1029 } 1030 1031 int nfs4_call_sync(struct rpc_clnt *clnt, 1032 struct nfs_server *server, 1033 struct rpc_message *msg, 1034 struct nfs4_sequence_args *args, 1035 struct nfs4_sequence_res *res, 1036 int cache_reply) 1037 { 1038 nfs4_init_sequence(args, res, cache_reply); 1039 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1040 } 1041 1042 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1043 unsigned long timestamp) 1044 { 1045 struct nfs_inode *nfsi = NFS_I(dir); 1046 1047 spin_lock(&dir->i_lock); 1048 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1049 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) { 1050 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; 1051 nfsi->attrtimeo_timestamp = jiffies; 1052 } else { 1053 nfs_force_lookup_revalidate(dir); 1054 if (cinfo->before != inode_peek_iversion_raw(dir)) 1055 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | 1056 NFS_INO_INVALID_ACL; 1057 } 1058 inode_set_iversion_raw(dir, cinfo->after); 1059 nfsi->read_cache_jiffies = timestamp; 1060 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1061 nfs_fscache_invalidate(dir); 1062 spin_unlock(&dir->i_lock); 1063 } 1064 1065 struct nfs4_opendata { 1066 struct kref kref; 1067 struct nfs_openargs o_arg; 1068 struct nfs_openres o_res; 1069 struct nfs_open_confirmargs c_arg; 1070 struct nfs_open_confirmres c_res; 1071 struct nfs4_string owner_name; 1072 struct nfs4_string group_name; 1073 struct nfs4_label *a_label; 1074 struct nfs_fattr f_attr; 1075 struct nfs4_label *f_label; 1076 struct dentry *dir; 1077 struct dentry *dentry; 1078 struct nfs4_state_owner *owner; 1079 struct nfs4_state *state; 1080 struct iattr attrs; 1081 unsigned long timestamp; 1082 bool rpc_done; 1083 bool file_created; 1084 bool is_recover; 1085 bool cancelled; 1086 int rpc_status; 1087 }; 1088 1089 struct nfs4_open_createattrs { 1090 struct nfs4_label *label; 1091 struct iattr *sattr; 1092 const __u32 verf[2]; 1093 }; 1094 1095 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1096 int err, struct nfs4_exception *exception) 1097 { 1098 if (err != -EINVAL) 1099 return false; 1100 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1101 return false; 1102 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1103 exception->retry = 1; 1104 return true; 1105 } 1106 1107 static u32 1108 nfs4_map_atomic_open_share(struct nfs_server *server, 1109 fmode_t fmode, int openflags) 1110 { 1111 u32 res = 0; 1112 1113 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1114 case FMODE_READ: 1115 res = NFS4_SHARE_ACCESS_READ; 1116 break; 1117 case FMODE_WRITE: 1118 res = NFS4_SHARE_ACCESS_WRITE; 1119 break; 1120 case FMODE_READ|FMODE_WRITE: 1121 res = NFS4_SHARE_ACCESS_BOTH; 1122 } 1123 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1124 goto out; 1125 /* Want no delegation if we're using O_DIRECT */ 1126 if (openflags & O_DIRECT) 1127 res |= NFS4_SHARE_WANT_NO_DELEG; 1128 out: 1129 return res; 1130 } 1131 1132 static enum open_claim_type4 1133 nfs4_map_atomic_open_claim(struct nfs_server *server, 1134 enum open_claim_type4 claim) 1135 { 1136 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1137 return claim; 1138 switch (claim) { 1139 default: 1140 return claim; 1141 case NFS4_OPEN_CLAIM_FH: 1142 return NFS4_OPEN_CLAIM_NULL; 1143 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1144 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1145 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1146 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1147 } 1148 } 1149 1150 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1151 { 1152 p->o_res.f_attr = &p->f_attr; 1153 p->o_res.f_label = p->f_label; 1154 p->o_res.seqid = p->o_arg.seqid; 1155 p->c_res.seqid = p->c_arg.seqid; 1156 p->o_res.server = p->o_arg.server; 1157 p->o_res.access_request = p->o_arg.access; 1158 nfs_fattr_init(&p->f_attr); 1159 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1160 } 1161 1162 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1163 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1164 const struct nfs4_open_createattrs *c, 1165 enum open_claim_type4 claim, 1166 gfp_t gfp_mask) 1167 { 1168 struct dentry *parent = dget_parent(dentry); 1169 struct inode *dir = d_inode(parent); 1170 struct nfs_server *server = NFS_SERVER(dir); 1171 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1172 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1173 struct nfs4_opendata *p; 1174 1175 p = kzalloc(sizeof(*p), gfp_mask); 1176 if (p == NULL) 1177 goto err; 1178 1179 p->f_label = nfs4_label_alloc(server, gfp_mask); 1180 if (IS_ERR(p->f_label)) 1181 goto err_free_p; 1182 1183 p->a_label = nfs4_label_alloc(server, gfp_mask); 1184 if (IS_ERR(p->a_label)) 1185 goto err_free_f; 1186 1187 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1188 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1189 if (IS_ERR(p->o_arg.seqid)) 1190 goto err_free_label; 1191 nfs_sb_active(dentry->d_sb); 1192 p->dentry = dget(dentry); 1193 p->dir = parent; 1194 p->owner = sp; 1195 atomic_inc(&sp->so_count); 1196 p->o_arg.open_flags = flags; 1197 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1198 p->o_arg.umask = current_umask(); 1199 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1200 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1201 fmode, flags); 1202 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1203 * will return permission denied for all bits until close */ 1204 if (!(flags & O_EXCL)) { 1205 /* ask server to check for all possible rights as results 1206 * are cached */ 1207 switch (p->o_arg.claim) { 1208 default: 1209 break; 1210 case NFS4_OPEN_CLAIM_NULL: 1211 case NFS4_OPEN_CLAIM_FH: 1212 p->o_arg.access = NFS4_ACCESS_READ | 1213 NFS4_ACCESS_MODIFY | 1214 NFS4_ACCESS_EXTEND | 1215 NFS4_ACCESS_EXECUTE; 1216 } 1217 } 1218 p->o_arg.clientid = server->nfs_client->cl_clientid; 1219 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1220 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1221 p->o_arg.name = &dentry->d_name; 1222 p->o_arg.server = server; 1223 p->o_arg.bitmask = nfs4_bitmask(server, label); 1224 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1225 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1226 switch (p->o_arg.claim) { 1227 case NFS4_OPEN_CLAIM_NULL: 1228 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1229 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1230 p->o_arg.fh = NFS_FH(dir); 1231 break; 1232 case NFS4_OPEN_CLAIM_PREVIOUS: 1233 case NFS4_OPEN_CLAIM_FH: 1234 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1235 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1236 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1237 } 1238 if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) { 1239 p->o_arg.u.attrs = &p->attrs; 1240 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1241 1242 memcpy(p->o_arg.u.verifier.data, c->verf, 1243 sizeof(p->o_arg.u.verifier.data)); 1244 } 1245 p->c_arg.fh = &p->o_res.fh; 1246 p->c_arg.stateid = &p->o_res.stateid; 1247 p->c_arg.seqid = p->o_arg.seqid; 1248 nfs4_init_opendata_res(p); 1249 kref_init(&p->kref); 1250 return p; 1251 1252 err_free_label: 1253 nfs4_label_free(p->a_label); 1254 err_free_f: 1255 nfs4_label_free(p->f_label); 1256 err_free_p: 1257 kfree(p); 1258 err: 1259 dput(parent); 1260 return NULL; 1261 } 1262 1263 static void nfs4_opendata_free(struct kref *kref) 1264 { 1265 struct nfs4_opendata *p = container_of(kref, 1266 struct nfs4_opendata, kref); 1267 struct super_block *sb = p->dentry->d_sb; 1268 1269 nfs_free_seqid(p->o_arg.seqid); 1270 nfs4_sequence_free_slot(&p->o_res.seq_res); 1271 if (p->state != NULL) 1272 nfs4_put_open_state(p->state); 1273 nfs4_put_state_owner(p->owner); 1274 1275 nfs4_label_free(p->a_label); 1276 nfs4_label_free(p->f_label); 1277 1278 dput(p->dir); 1279 dput(p->dentry); 1280 nfs_sb_deactive(sb); 1281 nfs_fattr_free_names(&p->f_attr); 1282 kfree(p->f_attr.mdsthreshold); 1283 kfree(p); 1284 } 1285 1286 static void nfs4_opendata_put(struct nfs4_opendata *p) 1287 { 1288 if (p != NULL) 1289 kref_put(&p->kref, nfs4_opendata_free); 1290 } 1291 1292 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1293 fmode_t fmode) 1294 { 1295 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1296 case FMODE_READ|FMODE_WRITE: 1297 return state->n_rdwr != 0; 1298 case FMODE_WRITE: 1299 return state->n_wronly != 0; 1300 case FMODE_READ: 1301 return state->n_rdonly != 0; 1302 } 1303 WARN_ON_ONCE(1); 1304 return false; 1305 } 1306 1307 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1308 { 1309 int ret = 0; 1310 1311 if (open_mode & (O_EXCL|O_TRUNC)) 1312 goto out; 1313 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1314 case FMODE_READ: 1315 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1316 && state->n_rdonly != 0; 1317 break; 1318 case FMODE_WRITE: 1319 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1320 && state->n_wronly != 0; 1321 break; 1322 case FMODE_READ|FMODE_WRITE: 1323 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1324 && state->n_rdwr != 0; 1325 } 1326 out: 1327 return ret; 1328 } 1329 1330 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1331 enum open_claim_type4 claim) 1332 { 1333 if (delegation == NULL) 1334 return 0; 1335 if ((delegation->type & fmode) != fmode) 1336 return 0; 1337 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1338 return 0; 1339 switch (claim) { 1340 case NFS4_OPEN_CLAIM_NULL: 1341 case NFS4_OPEN_CLAIM_FH: 1342 break; 1343 case NFS4_OPEN_CLAIM_PREVIOUS: 1344 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1345 break; 1346 default: 1347 return 0; 1348 } 1349 nfs_mark_delegation_referenced(delegation); 1350 return 1; 1351 } 1352 1353 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1354 { 1355 switch (fmode) { 1356 case FMODE_WRITE: 1357 state->n_wronly++; 1358 break; 1359 case FMODE_READ: 1360 state->n_rdonly++; 1361 break; 1362 case FMODE_READ|FMODE_WRITE: 1363 state->n_rdwr++; 1364 } 1365 nfs4_state_set_mode_locked(state, state->state | fmode); 1366 } 1367 1368 #ifdef CONFIG_NFS_V4_1 1369 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1370 { 1371 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1372 return true; 1373 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1374 return true; 1375 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1376 return true; 1377 return false; 1378 } 1379 #endif /* CONFIG_NFS_V4_1 */ 1380 1381 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1382 { 1383 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1384 wake_up_all(&state->waitq); 1385 } 1386 1387 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state, 1388 const nfs4_stateid *stateid) 1389 { 1390 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid); 1391 u32 stateid_seqid = be32_to_cpu(stateid->seqid); 1392 1393 if (stateid_seqid == state_seqid + 1U || 1394 (stateid_seqid == 1U && state_seqid == 0xffffffffU)) 1395 nfs_state_log_update_open_stateid(state); 1396 else 1397 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1398 } 1399 1400 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1401 { 1402 struct nfs_client *clp = state->owner->so_server->nfs_client; 1403 bool need_recover = false; 1404 1405 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1406 need_recover = true; 1407 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1408 need_recover = true; 1409 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1410 need_recover = true; 1411 if (need_recover) 1412 nfs4_state_mark_reclaim_nograce(clp, state); 1413 } 1414 1415 /* 1416 * Check for whether or not the caller may update the open stateid 1417 * to the value passed in by stateid. 1418 * 1419 * Note: This function relies heavily on the server implementing 1420 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1421 * correctly. 1422 * i.e. The stateid seqids have to be initialised to 1, and 1423 * are then incremented on every state transition. 1424 */ 1425 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1426 const nfs4_stateid *stateid) 1427 { 1428 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 || 1429 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1430 if (stateid->seqid == cpu_to_be32(1)) 1431 nfs_state_log_update_open_stateid(state); 1432 else 1433 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1434 return true; 1435 } 1436 1437 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1438 nfs_state_log_out_of_order_open_stateid(state, stateid); 1439 return true; 1440 } 1441 return false; 1442 } 1443 1444 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1445 { 1446 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1447 return; 1448 if (state->n_wronly) 1449 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1450 if (state->n_rdonly) 1451 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1452 if (state->n_rdwr) 1453 set_bit(NFS_O_RDWR_STATE, &state->flags); 1454 set_bit(NFS_OPEN_STATE, &state->flags); 1455 } 1456 1457 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1458 nfs4_stateid *stateid, fmode_t fmode) 1459 { 1460 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1461 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1462 case FMODE_WRITE: 1463 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1464 break; 1465 case FMODE_READ: 1466 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1467 break; 1468 case 0: 1469 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1470 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1471 clear_bit(NFS_OPEN_STATE, &state->flags); 1472 } 1473 if (stateid == NULL) 1474 return; 1475 /* Handle OPEN+OPEN_DOWNGRADE races */ 1476 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1477 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1478 nfs_resync_open_stateid_locked(state); 1479 goto out; 1480 } 1481 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1482 nfs4_stateid_copy(&state->stateid, stateid); 1483 nfs4_stateid_copy(&state->open_stateid, stateid); 1484 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1485 out: 1486 nfs_state_log_update_open_stateid(state); 1487 } 1488 1489 static void nfs_clear_open_stateid(struct nfs4_state *state, 1490 nfs4_stateid *arg_stateid, 1491 nfs4_stateid *stateid, fmode_t fmode) 1492 { 1493 write_seqlock(&state->seqlock); 1494 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1495 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1496 nfs_clear_open_stateid_locked(state, stateid, fmode); 1497 write_sequnlock(&state->seqlock); 1498 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1499 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1500 } 1501 1502 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1503 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1504 { 1505 DEFINE_WAIT(wait); 1506 int status = 0; 1507 for (;;) { 1508 1509 if (!nfs_need_update_open_stateid(state, stateid)) 1510 return; 1511 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1512 break; 1513 if (status) 1514 break; 1515 /* Rely on seqids for serialisation with NFSv4.0 */ 1516 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1517 break; 1518 1519 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1520 /* 1521 * Ensure we process the state changes in the same order 1522 * in which the server processed them by delaying the 1523 * update of the stateid until we are in sequence. 1524 */ 1525 write_sequnlock(&state->seqlock); 1526 spin_unlock(&state->owner->so_lock); 1527 rcu_read_unlock(); 1528 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1529 if (!signal_pending(current)) { 1530 if (schedule_timeout(5*HZ) == 0) 1531 status = -EAGAIN; 1532 else 1533 status = 0; 1534 } else 1535 status = -EINTR; 1536 finish_wait(&state->waitq, &wait); 1537 rcu_read_lock(); 1538 spin_lock(&state->owner->so_lock); 1539 write_seqlock(&state->seqlock); 1540 } 1541 1542 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1543 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1544 nfs4_stateid_copy(freeme, &state->open_stateid); 1545 nfs_test_and_clear_all_open_stateid(state); 1546 } 1547 1548 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1549 nfs4_stateid_copy(&state->stateid, stateid); 1550 nfs4_stateid_copy(&state->open_stateid, stateid); 1551 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1552 nfs_state_log_update_open_stateid(state); 1553 } 1554 1555 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1556 const nfs4_stateid *open_stateid, 1557 fmode_t fmode, 1558 nfs4_stateid *freeme) 1559 { 1560 /* 1561 * Protect the call to nfs4_state_set_mode_locked and 1562 * serialise the stateid update 1563 */ 1564 write_seqlock(&state->seqlock); 1565 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1566 switch (fmode) { 1567 case FMODE_READ: 1568 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1569 break; 1570 case FMODE_WRITE: 1571 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1572 break; 1573 case FMODE_READ|FMODE_WRITE: 1574 set_bit(NFS_O_RDWR_STATE, &state->flags); 1575 } 1576 set_bit(NFS_OPEN_STATE, &state->flags); 1577 write_sequnlock(&state->seqlock); 1578 } 1579 1580 static void nfs_state_set_delegation(struct nfs4_state *state, 1581 const nfs4_stateid *deleg_stateid, 1582 fmode_t fmode) 1583 { 1584 /* 1585 * Protect the call to nfs4_state_set_mode_locked and 1586 * serialise the stateid update 1587 */ 1588 write_seqlock(&state->seqlock); 1589 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1590 set_bit(NFS_DELEGATED_STATE, &state->flags); 1591 write_sequnlock(&state->seqlock); 1592 } 1593 1594 static int update_open_stateid(struct nfs4_state *state, 1595 const nfs4_stateid *open_stateid, 1596 const nfs4_stateid *delegation, 1597 fmode_t fmode) 1598 { 1599 struct nfs_server *server = NFS_SERVER(state->inode); 1600 struct nfs_client *clp = server->nfs_client; 1601 struct nfs_inode *nfsi = NFS_I(state->inode); 1602 struct nfs_delegation *deleg_cur; 1603 nfs4_stateid freeme = { }; 1604 int ret = 0; 1605 1606 fmode &= (FMODE_READ|FMODE_WRITE); 1607 1608 rcu_read_lock(); 1609 spin_lock(&state->owner->so_lock); 1610 if (open_stateid != NULL) { 1611 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1612 ret = 1; 1613 } 1614 1615 deleg_cur = rcu_dereference(nfsi->delegation); 1616 if (deleg_cur == NULL) 1617 goto no_delegation; 1618 1619 spin_lock(&deleg_cur->lock); 1620 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1621 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1622 (deleg_cur->type & fmode) != fmode) 1623 goto no_delegation_unlock; 1624 1625 if (delegation == NULL) 1626 delegation = &deleg_cur->stateid; 1627 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1628 goto no_delegation_unlock; 1629 1630 nfs_mark_delegation_referenced(deleg_cur); 1631 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1632 ret = 1; 1633 no_delegation_unlock: 1634 spin_unlock(&deleg_cur->lock); 1635 no_delegation: 1636 if (ret) 1637 update_open_stateflags(state, fmode); 1638 spin_unlock(&state->owner->so_lock); 1639 rcu_read_unlock(); 1640 1641 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1642 nfs4_schedule_state_manager(clp); 1643 if (freeme.type != 0) 1644 nfs4_test_and_free_stateid(server, &freeme, 1645 state->owner->so_cred); 1646 1647 return ret; 1648 } 1649 1650 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1651 const nfs4_stateid *stateid) 1652 { 1653 struct nfs4_state *state = lsp->ls_state; 1654 bool ret = false; 1655 1656 spin_lock(&state->state_lock); 1657 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1658 goto out_noupdate; 1659 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1660 goto out_noupdate; 1661 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1662 ret = true; 1663 out_noupdate: 1664 spin_unlock(&state->state_lock); 1665 return ret; 1666 } 1667 1668 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1669 { 1670 struct nfs_delegation *delegation; 1671 1672 rcu_read_lock(); 1673 delegation = rcu_dereference(NFS_I(inode)->delegation); 1674 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1675 rcu_read_unlock(); 1676 return; 1677 } 1678 rcu_read_unlock(); 1679 nfs4_inode_return_delegation(inode); 1680 } 1681 1682 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1683 { 1684 struct nfs4_state *state = opendata->state; 1685 struct nfs_inode *nfsi = NFS_I(state->inode); 1686 struct nfs_delegation *delegation; 1687 int open_mode = opendata->o_arg.open_flags; 1688 fmode_t fmode = opendata->o_arg.fmode; 1689 enum open_claim_type4 claim = opendata->o_arg.claim; 1690 nfs4_stateid stateid; 1691 int ret = -EAGAIN; 1692 1693 for (;;) { 1694 spin_lock(&state->owner->so_lock); 1695 if (can_open_cached(state, fmode, open_mode)) { 1696 update_open_stateflags(state, fmode); 1697 spin_unlock(&state->owner->so_lock); 1698 goto out_return_state; 1699 } 1700 spin_unlock(&state->owner->so_lock); 1701 rcu_read_lock(); 1702 delegation = rcu_dereference(nfsi->delegation); 1703 if (!can_open_delegated(delegation, fmode, claim)) { 1704 rcu_read_unlock(); 1705 break; 1706 } 1707 /* Save the delegation */ 1708 nfs4_stateid_copy(&stateid, &delegation->stateid); 1709 rcu_read_unlock(); 1710 nfs_release_seqid(opendata->o_arg.seqid); 1711 if (!opendata->is_recover) { 1712 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1713 if (ret != 0) 1714 goto out; 1715 } 1716 ret = -EAGAIN; 1717 1718 /* Try to update the stateid using the delegation */ 1719 if (update_open_stateid(state, NULL, &stateid, fmode)) 1720 goto out_return_state; 1721 } 1722 out: 1723 return ERR_PTR(ret); 1724 out_return_state: 1725 atomic_inc(&state->count); 1726 return state; 1727 } 1728 1729 static void 1730 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1731 { 1732 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1733 struct nfs_delegation *delegation; 1734 int delegation_flags = 0; 1735 1736 rcu_read_lock(); 1737 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1738 if (delegation) 1739 delegation_flags = delegation->flags; 1740 rcu_read_unlock(); 1741 switch (data->o_arg.claim) { 1742 default: 1743 break; 1744 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1745 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1746 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1747 "returning a delegation for " 1748 "OPEN(CLAIM_DELEGATE_CUR)\n", 1749 clp->cl_hostname); 1750 return; 1751 } 1752 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1753 nfs_inode_set_delegation(state->inode, 1754 data->owner->so_cred, 1755 &data->o_res); 1756 else 1757 nfs_inode_reclaim_delegation(state->inode, 1758 data->owner->so_cred, 1759 &data->o_res); 1760 } 1761 1762 /* 1763 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1764 * and update the nfs4_state. 1765 */ 1766 static struct nfs4_state * 1767 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1768 { 1769 struct inode *inode = data->state->inode; 1770 struct nfs4_state *state = data->state; 1771 int ret; 1772 1773 if (!data->rpc_done) { 1774 if (data->rpc_status) 1775 return ERR_PTR(data->rpc_status); 1776 /* cached opens have already been processed */ 1777 goto update; 1778 } 1779 1780 ret = nfs_refresh_inode(inode, &data->f_attr); 1781 if (ret) 1782 return ERR_PTR(ret); 1783 1784 if (data->o_res.delegation_type != 0) 1785 nfs4_opendata_check_deleg(data, state); 1786 update: 1787 update_open_stateid(state, &data->o_res.stateid, NULL, 1788 data->o_arg.fmode); 1789 atomic_inc(&state->count); 1790 1791 return state; 1792 } 1793 1794 static struct inode * 1795 nfs4_opendata_get_inode(struct nfs4_opendata *data) 1796 { 1797 struct inode *inode; 1798 1799 switch (data->o_arg.claim) { 1800 case NFS4_OPEN_CLAIM_NULL: 1801 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1802 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1803 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1804 return ERR_PTR(-EAGAIN); 1805 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 1806 &data->f_attr, data->f_label); 1807 break; 1808 default: 1809 inode = d_inode(data->dentry); 1810 ihold(inode); 1811 nfs_refresh_inode(inode, &data->f_attr); 1812 } 1813 return inode; 1814 } 1815 1816 static struct nfs4_state * 1817 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 1818 { 1819 struct nfs4_state *state; 1820 struct inode *inode; 1821 1822 inode = nfs4_opendata_get_inode(data); 1823 if (IS_ERR(inode)) 1824 return ERR_CAST(inode); 1825 if (data->state != NULL && data->state->inode == inode) { 1826 state = data->state; 1827 atomic_inc(&state->count); 1828 } else 1829 state = nfs4_get_open_state(inode, data->owner); 1830 iput(inode); 1831 if (state == NULL) 1832 state = ERR_PTR(-ENOMEM); 1833 return state; 1834 } 1835 1836 static struct nfs4_state * 1837 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1838 { 1839 struct nfs4_state *state; 1840 1841 if (!data->rpc_done) { 1842 state = nfs4_try_open_cached(data); 1843 trace_nfs4_cached_open(data->state); 1844 goto out; 1845 } 1846 1847 state = nfs4_opendata_find_nfs4_state(data); 1848 if (IS_ERR(state)) 1849 goto out; 1850 1851 if (data->o_res.delegation_type != 0) 1852 nfs4_opendata_check_deleg(data, state); 1853 update_open_stateid(state, &data->o_res.stateid, NULL, 1854 data->o_arg.fmode); 1855 out: 1856 nfs_release_seqid(data->o_arg.seqid); 1857 return state; 1858 } 1859 1860 static struct nfs4_state * 1861 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1862 { 1863 struct nfs4_state *ret; 1864 1865 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1866 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 1867 else 1868 ret = _nfs4_opendata_to_nfs4_state(data); 1869 nfs4_sequence_free_slot(&data->o_res.seq_res); 1870 return ret; 1871 } 1872 1873 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1874 { 1875 struct nfs_inode *nfsi = NFS_I(state->inode); 1876 struct nfs_open_context *ctx; 1877 1878 spin_lock(&state->inode->i_lock); 1879 list_for_each_entry(ctx, &nfsi->open_files, list) { 1880 if (ctx->state != state) 1881 continue; 1882 get_nfs_open_context(ctx); 1883 spin_unlock(&state->inode->i_lock); 1884 return ctx; 1885 } 1886 spin_unlock(&state->inode->i_lock); 1887 return ERR_PTR(-ENOENT); 1888 } 1889 1890 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1891 struct nfs4_state *state, enum open_claim_type4 claim) 1892 { 1893 struct nfs4_opendata *opendata; 1894 1895 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1896 NULL, claim, GFP_NOFS); 1897 if (opendata == NULL) 1898 return ERR_PTR(-ENOMEM); 1899 opendata->state = state; 1900 atomic_inc(&state->count); 1901 return opendata; 1902 } 1903 1904 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 1905 fmode_t fmode) 1906 { 1907 struct nfs4_state *newstate; 1908 int ret; 1909 1910 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 1911 return 0; 1912 opendata->o_arg.open_flags = 0; 1913 opendata->o_arg.fmode = fmode; 1914 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 1915 NFS_SB(opendata->dentry->d_sb), 1916 fmode, 0); 1917 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1918 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1919 nfs4_init_opendata_res(opendata); 1920 ret = _nfs4_recover_proc_open(opendata); 1921 if (ret != 0) 1922 return ret; 1923 newstate = nfs4_opendata_to_nfs4_state(opendata); 1924 if (IS_ERR(newstate)) 1925 return PTR_ERR(newstate); 1926 if (newstate != opendata->state) 1927 ret = -ESTALE; 1928 nfs4_close_state(newstate, fmode); 1929 return ret; 1930 } 1931 1932 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1933 { 1934 int ret; 1935 1936 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1937 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1938 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1939 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1940 /* memory barrier prior to reading state->n_* */ 1941 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1942 clear_bit(NFS_OPEN_STATE, &state->flags); 1943 smp_rmb(); 1944 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1945 if (ret != 0) 1946 return ret; 1947 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1948 if (ret != 0) 1949 return ret; 1950 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 1951 if (ret != 0) 1952 return ret; 1953 /* 1954 * We may have performed cached opens for all three recoveries. 1955 * Check if we need to update the current stateid. 1956 */ 1957 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1958 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1959 write_seqlock(&state->seqlock); 1960 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1961 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1962 write_sequnlock(&state->seqlock); 1963 } 1964 return 0; 1965 } 1966 1967 /* 1968 * OPEN_RECLAIM: 1969 * reclaim state on the server after a reboot. 1970 */ 1971 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1972 { 1973 struct nfs_delegation *delegation; 1974 struct nfs4_opendata *opendata; 1975 fmode_t delegation_type = 0; 1976 int status; 1977 1978 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1979 NFS4_OPEN_CLAIM_PREVIOUS); 1980 if (IS_ERR(opendata)) 1981 return PTR_ERR(opendata); 1982 rcu_read_lock(); 1983 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1984 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1985 delegation_type = delegation->type; 1986 rcu_read_unlock(); 1987 opendata->o_arg.u.delegation_type = delegation_type; 1988 status = nfs4_open_recover(opendata, state); 1989 nfs4_opendata_put(opendata); 1990 return status; 1991 } 1992 1993 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1994 { 1995 struct nfs_server *server = NFS_SERVER(state->inode); 1996 struct nfs4_exception exception = { }; 1997 int err; 1998 do { 1999 err = _nfs4_do_open_reclaim(ctx, state); 2000 trace_nfs4_open_reclaim(ctx, 0, err); 2001 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2002 continue; 2003 if (err != -NFS4ERR_DELAY) 2004 break; 2005 nfs4_handle_exception(server, err, &exception); 2006 } while (exception.retry); 2007 return err; 2008 } 2009 2010 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2011 { 2012 struct nfs_open_context *ctx; 2013 int ret; 2014 2015 ctx = nfs4_state_find_open_context(state); 2016 if (IS_ERR(ctx)) 2017 return -EAGAIN; 2018 ret = nfs4_do_open_reclaim(ctx, state); 2019 put_nfs_open_context(ctx); 2020 return ret; 2021 } 2022 2023 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err) 2024 { 2025 switch (err) { 2026 default: 2027 printk(KERN_ERR "NFS: %s: unhandled error " 2028 "%d.\n", __func__, err); 2029 case 0: 2030 case -ENOENT: 2031 case -EAGAIN: 2032 case -ESTALE: 2033 break; 2034 case -NFS4ERR_BADSESSION: 2035 case -NFS4ERR_BADSLOT: 2036 case -NFS4ERR_BAD_HIGH_SLOT: 2037 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2038 case -NFS4ERR_DEADSESSION: 2039 set_bit(NFS_DELEGATED_STATE, &state->flags); 2040 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 2041 return -EAGAIN; 2042 case -NFS4ERR_STALE_CLIENTID: 2043 case -NFS4ERR_STALE_STATEID: 2044 set_bit(NFS_DELEGATED_STATE, &state->flags); 2045 /* Don't recall a delegation if it was lost */ 2046 nfs4_schedule_lease_recovery(server->nfs_client); 2047 return -EAGAIN; 2048 case -NFS4ERR_MOVED: 2049 nfs4_schedule_migration_recovery(server); 2050 return -EAGAIN; 2051 case -NFS4ERR_LEASE_MOVED: 2052 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2053 return -EAGAIN; 2054 case -NFS4ERR_DELEG_REVOKED: 2055 case -NFS4ERR_ADMIN_REVOKED: 2056 case -NFS4ERR_EXPIRED: 2057 case -NFS4ERR_BAD_STATEID: 2058 case -NFS4ERR_OPENMODE: 2059 nfs_inode_find_state_and_recover(state->inode, 2060 stateid); 2061 nfs4_schedule_stateid_recovery(server, state); 2062 return -EAGAIN; 2063 case -NFS4ERR_DELAY: 2064 case -NFS4ERR_GRACE: 2065 set_bit(NFS_DELEGATED_STATE, &state->flags); 2066 ssleep(1); 2067 return -EAGAIN; 2068 case -ENOMEM: 2069 case -NFS4ERR_DENIED: 2070 if (fl) { 2071 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2072 if (lsp) 2073 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2074 } 2075 return 0; 2076 } 2077 return err; 2078 } 2079 2080 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2081 struct nfs4_state *state, const nfs4_stateid *stateid, 2082 fmode_t type) 2083 { 2084 struct nfs_server *server = NFS_SERVER(state->inode); 2085 struct nfs4_opendata *opendata; 2086 int err = 0; 2087 2088 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2089 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2090 if (IS_ERR(opendata)) 2091 return PTR_ERR(opendata); 2092 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2093 write_seqlock(&state->seqlock); 2094 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2095 write_sequnlock(&state->seqlock); 2096 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2097 switch (type & (FMODE_READ|FMODE_WRITE)) { 2098 case FMODE_READ|FMODE_WRITE: 2099 case FMODE_WRITE: 2100 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2101 if (err) 2102 break; 2103 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2104 if (err) 2105 break; 2106 case FMODE_READ: 2107 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2108 } 2109 nfs4_opendata_put(opendata); 2110 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2111 } 2112 2113 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2114 { 2115 struct nfs4_opendata *data = calldata; 2116 2117 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2118 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2119 } 2120 2121 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2122 { 2123 struct nfs4_opendata *data = calldata; 2124 2125 nfs40_sequence_done(task, &data->c_res.seq_res); 2126 2127 data->rpc_status = task->tk_status; 2128 if (data->rpc_status == 0) { 2129 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2130 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2131 renew_lease(data->o_res.server, data->timestamp); 2132 data->rpc_done = true; 2133 } 2134 } 2135 2136 static void nfs4_open_confirm_release(void *calldata) 2137 { 2138 struct nfs4_opendata *data = calldata; 2139 struct nfs4_state *state = NULL; 2140 2141 /* If this request hasn't been cancelled, do nothing */ 2142 if (!data->cancelled) 2143 goto out_free; 2144 /* In case of error, no cleanup! */ 2145 if (!data->rpc_done) 2146 goto out_free; 2147 state = nfs4_opendata_to_nfs4_state(data); 2148 if (!IS_ERR(state)) 2149 nfs4_close_state(state, data->o_arg.fmode); 2150 out_free: 2151 nfs4_opendata_put(data); 2152 } 2153 2154 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2155 .rpc_call_prepare = nfs4_open_confirm_prepare, 2156 .rpc_call_done = nfs4_open_confirm_done, 2157 .rpc_release = nfs4_open_confirm_release, 2158 }; 2159 2160 /* 2161 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2162 */ 2163 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2164 { 2165 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2166 struct rpc_task *task; 2167 struct rpc_message msg = { 2168 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2169 .rpc_argp = &data->c_arg, 2170 .rpc_resp = &data->c_res, 2171 .rpc_cred = data->owner->so_cred, 2172 }; 2173 struct rpc_task_setup task_setup_data = { 2174 .rpc_client = server->client, 2175 .rpc_message = &msg, 2176 .callback_ops = &nfs4_open_confirm_ops, 2177 .callback_data = data, 2178 .workqueue = nfsiod_workqueue, 2179 .flags = RPC_TASK_ASYNC, 2180 }; 2181 int status; 2182 2183 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); 2184 kref_get(&data->kref); 2185 data->rpc_done = false; 2186 data->rpc_status = 0; 2187 data->timestamp = jiffies; 2188 if (data->is_recover) 2189 nfs4_set_sequence_privileged(&data->c_arg.seq_args); 2190 task = rpc_run_task(&task_setup_data); 2191 if (IS_ERR(task)) 2192 return PTR_ERR(task); 2193 status = rpc_wait_for_completion_task(task); 2194 if (status != 0) { 2195 data->cancelled = true; 2196 smp_wmb(); 2197 } else 2198 status = data->rpc_status; 2199 rpc_put_task(task); 2200 return status; 2201 } 2202 2203 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2204 { 2205 struct nfs4_opendata *data = calldata; 2206 struct nfs4_state_owner *sp = data->owner; 2207 struct nfs_client *clp = sp->so_server->nfs_client; 2208 enum open_claim_type4 claim = data->o_arg.claim; 2209 2210 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2211 goto out_wait; 2212 /* 2213 * Check if we still need to send an OPEN call, or if we can use 2214 * a delegation instead. 2215 */ 2216 if (data->state != NULL) { 2217 struct nfs_delegation *delegation; 2218 2219 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 2220 goto out_no_action; 2221 rcu_read_lock(); 2222 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 2223 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2224 goto unlock_no_action; 2225 rcu_read_unlock(); 2226 } 2227 /* Update client id. */ 2228 data->o_arg.clientid = clp->cl_clientid; 2229 switch (claim) { 2230 default: 2231 break; 2232 case NFS4_OPEN_CLAIM_PREVIOUS: 2233 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2234 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2235 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2236 case NFS4_OPEN_CLAIM_FH: 2237 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2238 } 2239 data->timestamp = jiffies; 2240 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2241 &data->o_arg.seq_args, 2242 &data->o_res.seq_res, 2243 task) != 0) 2244 nfs_release_seqid(data->o_arg.seqid); 2245 2246 /* Set the create mode (note dependency on the session type) */ 2247 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2248 if (data->o_arg.open_flags & O_EXCL) { 2249 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2250 if (nfs4_has_persistent_session(clp)) 2251 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2252 else if (clp->cl_mvops->minor_version > 0) 2253 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2254 } 2255 return; 2256 unlock_no_action: 2257 trace_nfs4_cached_open(data->state); 2258 rcu_read_unlock(); 2259 out_no_action: 2260 task->tk_action = NULL; 2261 out_wait: 2262 nfs4_sequence_done(task, &data->o_res.seq_res); 2263 } 2264 2265 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2266 { 2267 struct nfs4_opendata *data = calldata; 2268 2269 data->rpc_status = task->tk_status; 2270 2271 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2272 return; 2273 2274 if (task->tk_status == 0) { 2275 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2276 switch (data->o_res.f_attr->mode & S_IFMT) { 2277 case S_IFREG: 2278 break; 2279 case S_IFLNK: 2280 data->rpc_status = -ELOOP; 2281 break; 2282 case S_IFDIR: 2283 data->rpc_status = -EISDIR; 2284 break; 2285 default: 2286 data->rpc_status = -ENOTDIR; 2287 } 2288 } 2289 renew_lease(data->o_res.server, data->timestamp); 2290 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2291 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2292 } 2293 data->rpc_done = true; 2294 } 2295 2296 static void nfs4_open_release(void *calldata) 2297 { 2298 struct nfs4_opendata *data = calldata; 2299 struct nfs4_state *state = NULL; 2300 2301 /* If this request hasn't been cancelled, do nothing */ 2302 if (!data->cancelled) 2303 goto out_free; 2304 /* In case of error, no cleanup! */ 2305 if (data->rpc_status != 0 || !data->rpc_done) 2306 goto out_free; 2307 /* In case we need an open_confirm, no cleanup! */ 2308 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2309 goto out_free; 2310 state = nfs4_opendata_to_nfs4_state(data); 2311 if (!IS_ERR(state)) 2312 nfs4_close_state(state, data->o_arg.fmode); 2313 out_free: 2314 nfs4_opendata_put(data); 2315 } 2316 2317 static const struct rpc_call_ops nfs4_open_ops = { 2318 .rpc_call_prepare = nfs4_open_prepare, 2319 .rpc_call_done = nfs4_open_done, 2320 .rpc_release = nfs4_open_release, 2321 }; 2322 2323 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 2324 { 2325 struct inode *dir = d_inode(data->dir); 2326 struct nfs_server *server = NFS_SERVER(dir); 2327 struct nfs_openargs *o_arg = &data->o_arg; 2328 struct nfs_openres *o_res = &data->o_res; 2329 struct rpc_task *task; 2330 struct rpc_message msg = { 2331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2332 .rpc_argp = o_arg, 2333 .rpc_resp = o_res, 2334 .rpc_cred = data->owner->so_cred, 2335 }; 2336 struct rpc_task_setup task_setup_data = { 2337 .rpc_client = server->client, 2338 .rpc_message = &msg, 2339 .callback_ops = &nfs4_open_ops, 2340 .callback_data = data, 2341 .workqueue = nfsiod_workqueue, 2342 .flags = RPC_TASK_ASYNC, 2343 }; 2344 int status; 2345 2346 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 2347 kref_get(&data->kref); 2348 data->rpc_done = false; 2349 data->rpc_status = 0; 2350 data->cancelled = false; 2351 data->is_recover = false; 2352 if (isrecover) { 2353 nfs4_set_sequence_privileged(&o_arg->seq_args); 2354 data->is_recover = true; 2355 } 2356 task = rpc_run_task(&task_setup_data); 2357 if (IS_ERR(task)) 2358 return PTR_ERR(task); 2359 status = rpc_wait_for_completion_task(task); 2360 if (status != 0) { 2361 data->cancelled = true; 2362 smp_wmb(); 2363 } else 2364 status = data->rpc_status; 2365 rpc_put_task(task); 2366 2367 return status; 2368 } 2369 2370 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2371 { 2372 struct inode *dir = d_inode(data->dir); 2373 struct nfs_openres *o_res = &data->o_res; 2374 int status; 2375 2376 status = nfs4_run_open_task(data, 1); 2377 if (status != 0 || !data->rpc_done) 2378 return status; 2379 2380 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2381 2382 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2383 status = _nfs4_proc_open_confirm(data); 2384 2385 return status; 2386 } 2387 2388 /* 2389 * Additional permission checks in order to distinguish between an 2390 * open for read, and an open for execute. This works around the 2391 * fact that NFSv4 OPEN treats read and execute permissions as being 2392 * the same. 2393 * Note that in the non-execute case, we want to turn off permission 2394 * checking if we just created a new file (POSIX open() semantics). 2395 */ 2396 static int nfs4_opendata_access(struct rpc_cred *cred, 2397 struct nfs4_opendata *opendata, 2398 struct nfs4_state *state, fmode_t fmode, 2399 int openflags) 2400 { 2401 struct nfs_access_entry cache; 2402 u32 mask, flags; 2403 2404 /* access call failed or for some reason the server doesn't 2405 * support any access modes -- defer access call until later */ 2406 if (opendata->o_res.access_supported == 0) 2407 return 0; 2408 2409 mask = 0; 2410 /* 2411 * Use openflags to check for exec, because fmode won't 2412 * always have FMODE_EXEC set when file open for exec. 2413 */ 2414 if (openflags & __FMODE_EXEC) { 2415 /* ONLY check for exec rights */ 2416 if (S_ISDIR(state->inode->i_mode)) 2417 mask = NFS4_ACCESS_LOOKUP; 2418 else 2419 mask = NFS4_ACCESS_EXECUTE; 2420 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2421 mask = NFS4_ACCESS_READ; 2422 2423 cache.cred = cred; 2424 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2425 nfs_access_add_cache(state->inode, &cache); 2426 2427 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2428 if ((mask & ~cache.mask & flags) == 0) 2429 return 0; 2430 2431 return -EACCES; 2432 } 2433 2434 /* 2435 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2436 */ 2437 static int _nfs4_proc_open(struct nfs4_opendata *data) 2438 { 2439 struct inode *dir = d_inode(data->dir); 2440 struct nfs_server *server = NFS_SERVER(dir); 2441 struct nfs_openargs *o_arg = &data->o_arg; 2442 struct nfs_openres *o_res = &data->o_res; 2443 int status; 2444 2445 status = nfs4_run_open_task(data, 0); 2446 if (!data->rpc_done) 2447 return status; 2448 if (status != 0) { 2449 if (status == -NFS4ERR_BADNAME && 2450 !(o_arg->open_flags & O_CREAT)) 2451 return -ENOENT; 2452 return status; 2453 } 2454 2455 nfs_fattr_map_and_free_names(server, &data->f_attr); 2456 2457 if (o_arg->open_flags & O_CREAT) { 2458 if (o_arg->open_flags & O_EXCL) 2459 data->file_created = true; 2460 else if (o_res->cinfo.before != o_res->cinfo.after) 2461 data->file_created = true; 2462 if (data->file_created || 2463 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2464 update_changeattr(dir, &o_res->cinfo, 2465 o_res->f_attr->time_start); 2466 } 2467 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2468 server->caps &= ~NFS_CAP_POSIX_LOCK; 2469 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2470 status = _nfs4_proc_open_confirm(data); 2471 if (status != 0) 2472 return status; 2473 } 2474 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2475 nfs4_sequence_free_slot(&o_res->seq_res); 2476 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2477 } 2478 return 0; 2479 } 2480 2481 /* 2482 * OPEN_EXPIRED: 2483 * reclaim state on the server after a network partition. 2484 * Assumes caller holds the appropriate lock 2485 */ 2486 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2487 { 2488 struct nfs4_opendata *opendata; 2489 int ret; 2490 2491 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2492 NFS4_OPEN_CLAIM_FH); 2493 if (IS_ERR(opendata)) 2494 return PTR_ERR(opendata); 2495 ret = nfs4_open_recover(opendata, state); 2496 if (ret == -ESTALE) 2497 d_drop(ctx->dentry); 2498 nfs4_opendata_put(opendata); 2499 return ret; 2500 } 2501 2502 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2503 { 2504 struct nfs_server *server = NFS_SERVER(state->inode); 2505 struct nfs4_exception exception = { }; 2506 int err; 2507 2508 do { 2509 err = _nfs4_open_expired(ctx, state); 2510 trace_nfs4_open_expired(ctx, 0, err); 2511 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2512 continue; 2513 switch (err) { 2514 default: 2515 goto out; 2516 case -NFS4ERR_GRACE: 2517 case -NFS4ERR_DELAY: 2518 nfs4_handle_exception(server, err, &exception); 2519 err = 0; 2520 } 2521 } while (exception.retry); 2522 out: 2523 return err; 2524 } 2525 2526 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2527 { 2528 struct nfs_open_context *ctx; 2529 int ret; 2530 2531 ctx = nfs4_state_find_open_context(state); 2532 if (IS_ERR(ctx)) 2533 return -EAGAIN; 2534 ret = nfs4_do_open_expired(ctx, state); 2535 put_nfs_open_context(ctx); 2536 return ret; 2537 } 2538 2539 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2540 const nfs4_stateid *stateid) 2541 { 2542 nfs_remove_bad_delegation(state->inode, stateid); 2543 write_seqlock(&state->seqlock); 2544 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2545 write_sequnlock(&state->seqlock); 2546 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2547 } 2548 2549 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2550 { 2551 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2552 nfs_finish_clear_delegation_stateid(state, NULL); 2553 } 2554 2555 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2556 { 2557 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2558 nfs40_clear_delegation_stateid(state); 2559 return nfs4_open_expired(sp, state); 2560 } 2561 2562 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2563 nfs4_stateid *stateid, 2564 struct rpc_cred *cred) 2565 { 2566 return -NFS4ERR_BAD_STATEID; 2567 } 2568 2569 #if defined(CONFIG_NFS_V4_1) 2570 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2571 nfs4_stateid *stateid, 2572 struct rpc_cred *cred) 2573 { 2574 int status; 2575 2576 switch (stateid->type) { 2577 default: 2578 break; 2579 case NFS4_INVALID_STATEID_TYPE: 2580 case NFS4_SPECIAL_STATEID_TYPE: 2581 return -NFS4ERR_BAD_STATEID; 2582 case NFS4_REVOKED_STATEID_TYPE: 2583 goto out_free; 2584 } 2585 2586 status = nfs41_test_stateid(server, stateid, cred); 2587 switch (status) { 2588 case -NFS4ERR_EXPIRED: 2589 case -NFS4ERR_ADMIN_REVOKED: 2590 case -NFS4ERR_DELEG_REVOKED: 2591 break; 2592 default: 2593 return status; 2594 } 2595 out_free: 2596 /* Ack the revoked state to the server */ 2597 nfs41_free_stateid(server, stateid, cred, true); 2598 return -NFS4ERR_EXPIRED; 2599 } 2600 2601 static void nfs41_check_delegation_stateid(struct nfs4_state *state) 2602 { 2603 struct nfs_server *server = NFS_SERVER(state->inode); 2604 nfs4_stateid stateid; 2605 struct nfs_delegation *delegation; 2606 struct rpc_cred *cred; 2607 int status; 2608 2609 /* Get the delegation credential for use by test/free_stateid */ 2610 rcu_read_lock(); 2611 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2612 if (delegation == NULL) { 2613 rcu_read_unlock(); 2614 return; 2615 } 2616 2617 nfs4_stateid_copy(&stateid, &delegation->stateid); 2618 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) || 2619 !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2620 &delegation->flags)) { 2621 rcu_read_unlock(); 2622 nfs_finish_clear_delegation_stateid(state, &stateid); 2623 return; 2624 } 2625 2626 cred = get_rpccred(delegation->cred); 2627 rcu_read_unlock(); 2628 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2629 trace_nfs4_test_delegation_stateid(state, NULL, status); 2630 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2631 nfs_finish_clear_delegation_stateid(state, &stateid); 2632 2633 put_rpccred(cred); 2634 } 2635 2636 /** 2637 * nfs41_check_expired_locks - possibly free a lock stateid 2638 * 2639 * @state: NFSv4 state for an inode 2640 * 2641 * Returns NFS_OK if recovery for this stateid is now finished. 2642 * Otherwise a negative NFS4ERR value is returned. 2643 */ 2644 static int nfs41_check_expired_locks(struct nfs4_state *state) 2645 { 2646 int status, ret = NFS_OK; 2647 struct nfs4_lock_state *lsp, *prev = NULL; 2648 struct nfs_server *server = NFS_SERVER(state->inode); 2649 2650 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2651 goto out; 2652 2653 spin_lock(&state->state_lock); 2654 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2655 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2656 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 2657 2658 refcount_inc(&lsp->ls_count); 2659 spin_unlock(&state->state_lock); 2660 2661 nfs4_put_lock_state(prev); 2662 prev = lsp; 2663 2664 status = nfs41_test_and_free_expired_stateid(server, 2665 &lsp->ls_stateid, 2666 cred); 2667 trace_nfs4_test_lock_stateid(state, lsp, status); 2668 if (status == -NFS4ERR_EXPIRED || 2669 status == -NFS4ERR_BAD_STATEID) { 2670 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2671 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2672 if (!recover_lost_locks) 2673 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2674 } else if (status != NFS_OK) { 2675 ret = status; 2676 nfs4_put_lock_state(prev); 2677 goto out; 2678 } 2679 spin_lock(&state->state_lock); 2680 } 2681 } 2682 spin_unlock(&state->state_lock); 2683 nfs4_put_lock_state(prev); 2684 out: 2685 return ret; 2686 } 2687 2688 /** 2689 * nfs41_check_open_stateid - possibly free an open stateid 2690 * 2691 * @state: NFSv4 state for an inode 2692 * 2693 * Returns NFS_OK if recovery for this stateid is now finished. 2694 * Otherwise a negative NFS4ERR value is returned. 2695 */ 2696 static int nfs41_check_open_stateid(struct nfs4_state *state) 2697 { 2698 struct nfs_server *server = NFS_SERVER(state->inode); 2699 nfs4_stateid *stateid = &state->open_stateid; 2700 struct rpc_cred *cred = state->owner->so_cred; 2701 int status; 2702 2703 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) { 2704 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) { 2705 if (nfs4_have_delegation(state->inode, state->state)) 2706 return NFS_OK; 2707 return -NFS4ERR_OPENMODE; 2708 } 2709 return -NFS4ERR_BAD_STATEID; 2710 } 2711 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2712 trace_nfs4_test_open_stateid(state, NULL, status); 2713 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2714 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2715 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2716 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2717 clear_bit(NFS_OPEN_STATE, &state->flags); 2718 stateid->type = NFS4_INVALID_STATEID_TYPE; 2719 return status; 2720 } 2721 if (nfs_open_stateid_recover_openmode(state)) 2722 return -NFS4ERR_OPENMODE; 2723 return NFS_OK; 2724 } 2725 2726 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2727 { 2728 int status; 2729 2730 nfs41_check_delegation_stateid(state); 2731 status = nfs41_check_expired_locks(state); 2732 if (status != NFS_OK) 2733 return status; 2734 status = nfs41_check_open_stateid(state); 2735 if (status != NFS_OK) 2736 status = nfs4_open_expired(sp, state); 2737 return status; 2738 } 2739 #endif 2740 2741 /* 2742 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2743 * fields corresponding to attributes that were used to store the verifier. 2744 * Make sure we clobber those fields in the later setattr call 2745 */ 2746 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2747 struct iattr *sattr, struct nfs4_label **label) 2748 { 2749 const u32 *attrset = opendata->o_res.attrset; 2750 2751 if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2752 !(sattr->ia_valid & ATTR_ATIME_SET)) 2753 sattr->ia_valid |= ATTR_ATIME; 2754 2755 if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2756 !(sattr->ia_valid & ATTR_MTIME_SET)) 2757 sattr->ia_valid |= ATTR_MTIME; 2758 2759 /* Except MODE, it seems harmless of setting twice. */ 2760 if (opendata->o_arg.createmode != NFS4_CREATE_EXCLUSIVE && 2761 (attrset[1] & FATTR4_WORD1_MODE || 2762 attrset[2] & FATTR4_WORD2_MODE_UMASK)) 2763 sattr->ia_valid &= ~ATTR_MODE; 2764 2765 if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL) 2766 *label = NULL; 2767 } 2768 2769 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2770 fmode_t fmode, 2771 int flags, 2772 struct nfs_open_context *ctx) 2773 { 2774 struct nfs4_state_owner *sp = opendata->owner; 2775 struct nfs_server *server = sp->so_server; 2776 struct dentry *dentry; 2777 struct nfs4_state *state; 2778 unsigned int seq; 2779 int ret; 2780 2781 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2782 2783 ret = _nfs4_proc_open(opendata); 2784 if (ret != 0) 2785 goto out; 2786 2787 state = nfs4_opendata_to_nfs4_state(opendata); 2788 ret = PTR_ERR(state); 2789 if (IS_ERR(state)) 2790 goto out; 2791 ctx->state = state; 2792 if (server->caps & NFS_CAP_POSIX_LOCK) 2793 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2794 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 2795 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 2796 2797 dentry = opendata->dentry; 2798 if (d_really_is_negative(dentry)) { 2799 struct dentry *alias; 2800 d_drop(dentry); 2801 alias = d_exact_alias(dentry, state->inode); 2802 if (!alias) 2803 alias = d_splice_alias(igrab(state->inode), dentry); 2804 /* d_splice_alias() can't fail here - it's a non-directory */ 2805 if (alias) { 2806 dput(ctx->dentry); 2807 ctx->dentry = dentry = alias; 2808 } 2809 nfs_set_verifier(dentry, 2810 nfs_save_change_attribute(d_inode(opendata->dir))); 2811 } 2812 2813 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2814 if (ret != 0) 2815 goto out; 2816 2817 if (d_inode(dentry) == state->inode) { 2818 nfs_inode_attach_open_context(ctx); 2819 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2820 nfs4_schedule_stateid_recovery(server, state); 2821 } 2822 out: 2823 return ret; 2824 } 2825 2826 /* 2827 * Returns a referenced nfs4_state 2828 */ 2829 static int _nfs4_do_open(struct inode *dir, 2830 struct nfs_open_context *ctx, 2831 int flags, 2832 const struct nfs4_open_createattrs *c, 2833 int *opened) 2834 { 2835 struct nfs4_state_owner *sp; 2836 struct nfs4_state *state = NULL; 2837 struct nfs_server *server = NFS_SERVER(dir); 2838 struct nfs4_opendata *opendata; 2839 struct dentry *dentry = ctx->dentry; 2840 struct rpc_cred *cred = ctx->cred; 2841 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2842 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2843 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2844 struct iattr *sattr = c->sattr; 2845 struct nfs4_label *label = c->label; 2846 struct nfs4_label *olabel = NULL; 2847 int status; 2848 2849 /* Protect against reboot recovery conflicts */ 2850 status = -ENOMEM; 2851 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2852 if (sp == NULL) { 2853 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2854 goto out_err; 2855 } 2856 status = nfs4_client_recover_expired_lease(server->nfs_client); 2857 if (status != 0) 2858 goto err_put_state_owner; 2859 if (d_really_is_positive(dentry)) 2860 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 2861 status = -ENOMEM; 2862 if (d_really_is_positive(dentry)) 2863 claim = NFS4_OPEN_CLAIM_FH; 2864 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 2865 c, claim, GFP_KERNEL); 2866 if (opendata == NULL) 2867 goto err_put_state_owner; 2868 2869 if (label) { 2870 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2871 if (IS_ERR(olabel)) { 2872 status = PTR_ERR(olabel); 2873 goto err_opendata_put; 2874 } 2875 } 2876 2877 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2878 if (!opendata->f_attr.mdsthreshold) { 2879 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2880 if (!opendata->f_attr.mdsthreshold) 2881 goto err_free_label; 2882 } 2883 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2884 } 2885 if (d_really_is_positive(dentry)) 2886 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 2887 2888 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2889 if (status != 0) 2890 goto err_free_label; 2891 state = ctx->state; 2892 2893 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 2894 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2895 nfs4_exclusive_attrset(opendata, sattr, &label); 2896 /* 2897 * send create attributes which was not set by open 2898 * with an extra setattr. 2899 */ 2900 if (sattr->ia_valid & NFS4_VALID_ATTRS) { 2901 nfs_fattr_init(opendata->o_res.f_attr); 2902 status = nfs4_do_setattr(state->inode, cred, 2903 opendata->o_res.f_attr, sattr, 2904 ctx, label, olabel); 2905 if (status == 0) { 2906 nfs_setattr_update_inode(state->inode, sattr, 2907 opendata->o_res.f_attr); 2908 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2909 } 2910 } 2911 } 2912 if (opened && opendata->file_created) 2913 *opened |= FILE_CREATED; 2914 2915 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2916 *ctx_th = opendata->f_attr.mdsthreshold; 2917 opendata->f_attr.mdsthreshold = NULL; 2918 } 2919 2920 nfs4_label_free(olabel); 2921 2922 nfs4_opendata_put(opendata); 2923 nfs4_put_state_owner(sp); 2924 return 0; 2925 err_free_label: 2926 nfs4_label_free(olabel); 2927 err_opendata_put: 2928 nfs4_opendata_put(opendata); 2929 err_put_state_owner: 2930 nfs4_put_state_owner(sp); 2931 out_err: 2932 return status; 2933 } 2934 2935 2936 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2937 struct nfs_open_context *ctx, 2938 int flags, 2939 struct iattr *sattr, 2940 struct nfs4_label *label, 2941 int *opened) 2942 { 2943 struct nfs_server *server = NFS_SERVER(dir); 2944 struct nfs4_exception exception = { }; 2945 struct nfs4_state *res; 2946 struct nfs4_open_createattrs c = { 2947 .label = label, 2948 .sattr = sattr, 2949 .verf = { 2950 [0] = (__u32)jiffies, 2951 [1] = (__u32)current->pid, 2952 }, 2953 }; 2954 int status; 2955 2956 do { 2957 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 2958 res = ctx->state; 2959 trace_nfs4_open_file(ctx, flags, status); 2960 if (status == 0) 2961 break; 2962 /* NOTE: BAD_SEQID means the server and client disagree about the 2963 * book-keeping w.r.t. state-changing operations 2964 * (OPEN/CLOSE/LOCK/LOCKU...) 2965 * It is actually a sign of a bug on the client or on the server. 2966 * 2967 * If we receive a BAD_SEQID error in the particular case of 2968 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2969 * have unhashed the old state_owner for us, and that we can 2970 * therefore safely retry using a new one. We should still warn 2971 * the user though... 2972 */ 2973 if (status == -NFS4ERR_BAD_SEQID) { 2974 pr_warn_ratelimited("NFS: v4 server %s " 2975 " returned a bad sequence-id error!\n", 2976 NFS_SERVER(dir)->nfs_client->cl_hostname); 2977 exception.retry = 1; 2978 continue; 2979 } 2980 /* 2981 * BAD_STATEID on OPEN means that the server cancelled our 2982 * state before it received the OPEN_CONFIRM. 2983 * Recover by retrying the request as per the discussion 2984 * on Page 181 of RFC3530. 2985 */ 2986 if (status == -NFS4ERR_BAD_STATEID) { 2987 exception.retry = 1; 2988 continue; 2989 } 2990 if (status == -EAGAIN) { 2991 /* We must have found a delegation */ 2992 exception.retry = 1; 2993 continue; 2994 } 2995 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2996 continue; 2997 res = ERR_PTR(nfs4_handle_exception(server, 2998 status, &exception)); 2999 } while (exception.retry); 3000 return res; 3001 } 3002 3003 static int _nfs4_do_setattr(struct inode *inode, 3004 struct nfs_setattrargs *arg, 3005 struct nfs_setattrres *res, 3006 struct rpc_cred *cred, 3007 struct nfs_open_context *ctx) 3008 { 3009 struct nfs_server *server = NFS_SERVER(inode); 3010 struct rpc_message msg = { 3011 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3012 .rpc_argp = arg, 3013 .rpc_resp = res, 3014 .rpc_cred = cred, 3015 }; 3016 struct rpc_cred *delegation_cred = NULL; 3017 unsigned long timestamp = jiffies; 3018 fmode_t fmode; 3019 bool truncate; 3020 int status; 3021 3022 nfs_fattr_init(res->fattr); 3023 3024 /* Servers should only apply open mode checks for file size changes */ 3025 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3026 fmode = truncate ? FMODE_WRITE : FMODE_READ; 3027 3028 if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) { 3029 /* Use that stateid */ 3030 } else if (truncate && ctx != NULL) { 3031 struct nfs_lock_context *l_ctx; 3032 if (!nfs4_valid_open_stateid(ctx->state)) 3033 return -EBADF; 3034 l_ctx = nfs_get_lock_context(ctx); 3035 if (IS_ERR(l_ctx)) 3036 return PTR_ERR(l_ctx); 3037 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3038 &arg->stateid, &delegation_cred); 3039 nfs_put_lock_context(l_ctx); 3040 if (status == -EIO) 3041 return -EBADF; 3042 } else 3043 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3044 if (delegation_cred) 3045 msg.rpc_cred = delegation_cred; 3046 3047 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3048 3049 put_rpccred(delegation_cred); 3050 if (status == 0 && ctx != NULL) 3051 renew_lease(server, timestamp); 3052 trace_nfs4_setattr(inode, &arg->stateid, status); 3053 return status; 3054 } 3055 3056 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 3057 struct nfs_fattr *fattr, struct iattr *sattr, 3058 struct nfs_open_context *ctx, struct nfs4_label *ilabel, 3059 struct nfs4_label *olabel) 3060 { 3061 struct nfs_server *server = NFS_SERVER(inode); 3062 struct nfs4_state *state = ctx ? ctx->state : NULL; 3063 struct nfs_setattrargs arg = { 3064 .fh = NFS_FH(inode), 3065 .iap = sattr, 3066 .server = server, 3067 .bitmask = server->attr_bitmask, 3068 .label = ilabel, 3069 }; 3070 struct nfs_setattrres res = { 3071 .fattr = fattr, 3072 .label = olabel, 3073 .server = server, 3074 }; 3075 struct nfs4_exception exception = { 3076 .state = state, 3077 .inode = inode, 3078 .stateid = &arg.stateid, 3079 }; 3080 int err; 3081 3082 arg.bitmask = nfs4_bitmask(server, ilabel); 3083 if (ilabel) 3084 arg.bitmask = nfs4_bitmask(server, olabel); 3085 3086 do { 3087 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3088 switch (err) { 3089 case -NFS4ERR_OPENMODE: 3090 if (!(sattr->ia_valid & ATTR_SIZE)) { 3091 pr_warn_once("NFSv4: server %s is incorrectly " 3092 "applying open mode checks to " 3093 "a SETATTR that is not " 3094 "changing file size.\n", 3095 server->nfs_client->cl_hostname); 3096 } 3097 if (state && !(state->state & FMODE_WRITE)) { 3098 err = -EBADF; 3099 if (sattr->ia_valid & ATTR_OPEN) 3100 err = -EACCES; 3101 goto out; 3102 } 3103 } 3104 err = nfs4_handle_exception(server, err, &exception); 3105 } while (exception.retry); 3106 out: 3107 return err; 3108 } 3109 3110 static bool 3111 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3112 { 3113 if (inode == NULL || !nfs_have_layout(inode)) 3114 return false; 3115 3116 return pnfs_wait_on_layoutreturn(inode, task); 3117 } 3118 3119 struct nfs4_closedata { 3120 struct inode *inode; 3121 struct nfs4_state *state; 3122 struct nfs_closeargs arg; 3123 struct nfs_closeres res; 3124 struct { 3125 struct nfs4_layoutreturn_args arg; 3126 struct nfs4_layoutreturn_res res; 3127 struct nfs4_xdr_opaque_data ld_private; 3128 u32 roc_barrier; 3129 bool roc; 3130 } lr; 3131 struct nfs_fattr fattr; 3132 unsigned long timestamp; 3133 }; 3134 3135 static void nfs4_free_closedata(void *data) 3136 { 3137 struct nfs4_closedata *calldata = data; 3138 struct nfs4_state_owner *sp = calldata->state->owner; 3139 struct super_block *sb = calldata->state->inode->i_sb; 3140 3141 if (calldata->lr.roc) 3142 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3143 calldata->res.lr_ret); 3144 nfs4_put_open_state(calldata->state); 3145 nfs_free_seqid(calldata->arg.seqid); 3146 nfs4_put_state_owner(sp); 3147 nfs_sb_deactive(sb); 3148 kfree(calldata); 3149 } 3150 3151 static void nfs4_close_done(struct rpc_task *task, void *data) 3152 { 3153 struct nfs4_closedata *calldata = data; 3154 struct nfs4_state *state = calldata->state; 3155 struct nfs_server *server = NFS_SERVER(calldata->inode); 3156 nfs4_stateid *res_stateid = NULL; 3157 struct nfs4_exception exception = { 3158 .state = state, 3159 .inode = calldata->inode, 3160 .stateid = &calldata->arg.stateid, 3161 }; 3162 3163 dprintk("%s: begin!\n", __func__); 3164 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3165 return; 3166 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3167 3168 /* Handle Layoutreturn errors */ 3169 if (calldata->arg.lr_args && task->tk_status != 0) { 3170 switch (calldata->res.lr_ret) { 3171 default: 3172 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3173 break; 3174 case 0: 3175 calldata->arg.lr_args = NULL; 3176 calldata->res.lr_res = NULL; 3177 break; 3178 case -NFS4ERR_OLD_STATEID: 3179 if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid, 3180 calldata->inode)) 3181 goto lr_restart; 3182 /* Fallthrough */ 3183 case -NFS4ERR_ADMIN_REVOKED: 3184 case -NFS4ERR_DELEG_REVOKED: 3185 case -NFS4ERR_EXPIRED: 3186 case -NFS4ERR_BAD_STATEID: 3187 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 3188 case -NFS4ERR_WRONG_CRED: 3189 calldata->arg.lr_args = NULL; 3190 calldata->res.lr_res = NULL; 3191 goto lr_restart; 3192 } 3193 } 3194 3195 /* hmm. we are done with the inode, and in the process of freeing 3196 * the state_owner. we keep this around to process errors 3197 */ 3198 switch (task->tk_status) { 3199 case 0: 3200 res_stateid = &calldata->res.stateid; 3201 renew_lease(server, calldata->timestamp); 3202 break; 3203 case -NFS4ERR_ACCESS: 3204 if (calldata->arg.bitmask != NULL) { 3205 calldata->arg.bitmask = NULL; 3206 calldata->res.fattr = NULL; 3207 goto out_restart; 3208 3209 } 3210 break; 3211 case -NFS4ERR_OLD_STATEID: 3212 /* Did we race with OPEN? */ 3213 if (nfs4_refresh_open_stateid(&calldata->arg.stateid, 3214 state)) 3215 goto out_restart; 3216 goto out_release; 3217 case -NFS4ERR_ADMIN_REVOKED: 3218 case -NFS4ERR_STALE_STATEID: 3219 case -NFS4ERR_EXPIRED: 3220 nfs4_free_revoked_stateid(server, 3221 &calldata->arg.stateid, 3222 task->tk_msg.rpc_cred); 3223 /* Fallthrough */ 3224 case -NFS4ERR_BAD_STATEID: 3225 break; 3226 default: 3227 task->tk_status = nfs4_async_handle_exception(task, 3228 server, task->tk_status, &exception); 3229 if (exception.retry) 3230 goto out_restart; 3231 } 3232 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3233 res_stateid, calldata->arg.fmode); 3234 out_release: 3235 task->tk_status = 0; 3236 nfs_release_seqid(calldata->arg.seqid); 3237 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3238 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 3239 return; 3240 lr_restart: 3241 calldata->res.lr_ret = 0; 3242 out_restart: 3243 task->tk_status = 0; 3244 rpc_restart_call_prepare(task); 3245 goto out_release; 3246 } 3247 3248 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3249 { 3250 struct nfs4_closedata *calldata = data; 3251 struct nfs4_state *state = calldata->state; 3252 struct inode *inode = calldata->inode; 3253 bool is_rdonly, is_wronly, is_rdwr; 3254 int call_close = 0; 3255 3256 dprintk("%s: begin!\n", __func__); 3257 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3258 goto out_wait; 3259 3260 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3261 spin_lock(&state->owner->so_lock); 3262 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3263 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3264 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3265 /* Calculate the change in open mode */ 3266 calldata->arg.fmode = 0; 3267 if (state->n_rdwr == 0) { 3268 if (state->n_rdonly == 0) 3269 call_close |= is_rdonly; 3270 else if (is_rdonly) 3271 calldata->arg.fmode |= FMODE_READ; 3272 if (state->n_wronly == 0) 3273 call_close |= is_wronly; 3274 else if (is_wronly) 3275 calldata->arg.fmode |= FMODE_WRITE; 3276 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3277 call_close |= is_rdwr; 3278 } else if (is_rdwr) 3279 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3280 3281 if (!nfs4_valid_open_stateid(state) || 3282 !nfs4_refresh_open_stateid(&calldata->arg.stateid, state)) 3283 call_close = 0; 3284 spin_unlock(&state->owner->so_lock); 3285 3286 if (!call_close) { 3287 /* Note: exit _without_ calling nfs4_close_done */ 3288 goto out_no_action; 3289 } 3290 3291 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3292 nfs_release_seqid(calldata->arg.seqid); 3293 goto out_wait; 3294 } 3295 3296 if (calldata->arg.fmode == 0) 3297 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3298 3299 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3300 /* Close-to-open cache consistency revalidation */ 3301 if (!nfs4_have_delegation(inode, FMODE_READ)) 3302 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3303 else 3304 calldata->arg.bitmask = NULL; 3305 } 3306 3307 calldata->arg.share_access = 3308 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3309 calldata->arg.fmode, 0); 3310 3311 if (calldata->res.fattr == NULL) 3312 calldata->arg.bitmask = NULL; 3313 else if (calldata->arg.bitmask == NULL) 3314 calldata->res.fattr = NULL; 3315 calldata->timestamp = jiffies; 3316 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3317 &calldata->arg.seq_args, 3318 &calldata->res.seq_res, 3319 task) != 0) 3320 nfs_release_seqid(calldata->arg.seqid); 3321 dprintk("%s: done!\n", __func__); 3322 return; 3323 out_no_action: 3324 task->tk_action = NULL; 3325 out_wait: 3326 nfs4_sequence_done(task, &calldata->res.seq_res); 3327 } 3328 3329 static const struct rpc_call_ops nfs4_close_ops = { 3330 .rpc_call_prepare = nfs4_close_prepare, 3331 .rpc_call_done = nfs4_close_done, 3332 .rpc_release = nfs4_free_closedata, 3333 }; 3334 3335 /* 3336 * It is possible for data to be read/written from a mem-mapped file 3337 * after the sys_close call (which hits the vfs layer as a flush). 3338 * This means that we can't safely call nfsv4 close on a file until 3339 * the inode is cleared. This in turn means that we are not good 3340 * NFSv4 citizens - we do not indicate to the server to update the file's 3341 * share state even when we are done with one of the three share 3342 * stateid's in the inode. 3343 * 3344 * NOTE: Caller must be holding the sp->so_owner semaphore! 3345 */ 3346 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3347 { 3348 struct nfs_server *server = NFS_SERVER(state->inode); 3349 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3350 struct nfs4_closedata *calldata; 3351 struct nfs4_state_owner *sp = state->owner; 3352 struct rpc_task *task; 3353 struct rpc_message msg = { 3354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3355 .rpc_cred = state->owner->so_cred, 3356 }; 3357 struct rpc_task_setup task_setup_data = { 3358 .rpc_client = server->client, 3359 .rpc_message = &msg, 3360 .callback_ops = &nfs4_close_ops, 3361 .workqueue = nfsiod_workqueue, 3362 .flags = RPC_TASK_ASYNC, 3363 }; 3364 int status = -ENOMEM; 3365 3366 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3367 &task_setup_data.rpc_client, &msg); 3368 3369 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3370 if (calldata == NULL) 3371 goto out; 3372 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 3373 calldata->inode = state->inode; 3374 calldata->state = state; 3375 calldata->arg.fh = NFS_FH(state->inode); 3376 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3377 goto out_free_calldata; 3378 /* Serialization for the sequence id */ 3379 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3380 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3381 if (IS_ERR(calldata->arg.seqid)) 3382 goto out_free_calldata; 3383 nfs_fattr_init(&calldata->fattr); 3384 calldata->arg.fmode = 0; 3385 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3386 calldata->res.fattr = &calldata->fattr; 3387 calldata->res.seqid = calldata->arg.seqid; 3388 calldata->res.server = server; 3389 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3390 calldata->lr.roc = pnfs_roc(state->inode, 3391 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3392 if (calldata->lr.roc) { 3393 calldata->arg.lr_args = &calldata->lr.arg; 3394 calldata->res.lr_res = &calldata->lr.res; 3395 } 3396 nfs_sb_active(calldata->inode->i_sb); 3397 3398 msg.rpc_argp = &calldata->arg; 3399 msg.rpc_resp = &calldata->res; 3400 task_setup_data.callback_data = calldata; 3401 task = rpc_run_task(&task_setup_data); 3402 if (IS_ERR(task)) 3403 return PTR_ERR(task); 3404 status = 0; 3405 if (wait) 3406 status = rpc_wait_for_completion_task(task); 3407 rpc_put_task(task); 3408 return status; 3409 out_free_calldata: 3410 kfree(calldata); 3411 out: 3412 nfs4_put_open_state(state); 3413 nfs4_put_state_owner(sp); 3414 return status; 3415 } 3416 3417 static struct inode * 3418 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3419 int open_flags, struct iattr *attr, int *opened) 3420 { 3421 struct nfs4_state *state; 3422 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3423 3424 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3425 3426 /* Protect against concurrent sillydeletes */ 3427 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3428 3429 nfs4_label_release_security(label); 3430 3431 if (IS_ERR(state)) 3432 return ERR_CAST(state); 3433 return state->inode; 3434 } 3435 3436 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3437 { 3438 if (ctx->state == NULL) 3439 return; 3440 if (is_sync) 3441 nfs4_close_sync(ctx->state, ctx->mode); 3442 else 3443 nfs4_close_state(ctx->state, ctx->mode); 3444 } 3445 3446 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3447 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3448 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL) 3449 3450 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3451 { 3452 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3453 struct nfs4_server_caps_arg args = { 3454 .fhandle = fhandle, 3455 .bitmask = bitmask, 3456 }; 3457 struct nfs4_server_caps_res res = {}; 3458 struct rpc_message msg = { 3459 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3460 .rpc_argp = &args, 3461 .rpc_resp = &res, 3462 }; 3463 int status; 3464 int i; 3465 3466 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3467 FATTR4_WORD0_FH_EXPIRE_TYPE | 3468 FATTR4_WORD0_LINK_SUPPORT | 3469 FATTR4_WORD0_SYMLINK_SUPPORT | 3470 FATTR4_WORD0_ACLSUPPORT; 3471 if (minorversion) 3472 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3473 3474 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3475 if (status == 0) { 3476 /* Sanity check the server answers */ 3477 switch (minorversion) { 3478 case 0: 3479 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3480 res.attr_bitmask[2] = 0; 3481 break; 3482 case 1: 3483 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3484 break; 3485 case 2: 3486 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3487 } 3488 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3489 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3490 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3491 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3492 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3493 NFS_CAP_CTIME|NFS_CAP_MTIME| 3494 NFS_CAP_SECURITY_LABEL); 3495 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3496 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3497 server->caps |= NFS_CAP_ACLS; 3498 if (res.has_links != 0) 3499 server->caps |= NFS_CAP_HARDLINKS; 3500 if (res.has_symlinks != 0) 3501 server->caps |= NFS_CAP_SYMLINKS; 3502 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3503 server->caps |= NFS_CAP_FILEID; 3504 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3505 server->caps |= NFS_CAP_MODE; 3506 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3507 server->caps |= NFS_CAP_NLINK; 3508 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3509 server->caps |= NFS_CAP_OWNER; 3510 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3511 server->caps |= NFS_CAP_OWNER_GROUP; 3512 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3513 server->caps |= NFS_CAP_ATIME; 3514 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3515 server->caps |= NFS_CAP_CTIME; 3516 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3517 server->caps |= NFS_CAP_MTIME; 3518 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3519 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3520 server->caps |= NFS_CAP_SECURITY_LABEL; 3521 #endif 3522 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3523 sizeof(server->attr_bitmask)); 3524 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3525 3526 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3527 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3528 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3529 server->cache_consistency_bitmask[2] = 0; 3530 3531 /* Avoid a regression due to buggy server */ 3532 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3533 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3534 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3535 sizeof(server->exclcreat_bitmask)); 3536 3537 server->acl_bitmask = res.acl_bitmask; 3538 server->fh_expire_type = res.fh_expire_type; 3539 } 3540 3541 return status; 3542 } 3543 3544 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3545 { 3546 struct nfs4_exception exception = { }; 3547 int err; 3548 do { 3549 err = nfs4_handle_exception(server, 3550 _nfs4_server_capabilities(server, fhandle), 3551 &exception); 3552 } while (exception.retry); 3553 return err; 3554 } 3555 3556 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3557 struct nfs_fsinfo *info) 3558 { 3559 u32 bitmask[3]; 3560 struct nfs4_lookup_root_arg args = { 3561 .bitmask = bitmask, 3562 }; 3563 struct nfs4_lookup_res res = { 3564 .server = server, 3565 .fattr = info->fattr, 3566 .fh = fhandle, 3567 }; 3568 struct rpc_message msg = { 3569 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3570 .rpc_argp = &args, 3571 .rpc_resp = &res, 3572 }; 3573 3574 bitmask[0] = nfs4_fattr_bitmap[0]; 3575 bitmask[1] = nfs4_fattr_bitmap[1]; 3576 /* 3577 * Process the label in the upcoming getfattr 3578 */ 3579 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3580 3581 nfs_fattr_init(info->fattr); 3582 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3583 } 3584 3585 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3586 struct nfs_fsinfo *info) 3587 { 3588 struct nfs4_exception exception = { }; 3589 int err; 3590 do { 3591 err = _nfs4_lookup_root(server, fhandle, info); 3592 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3593 switch (err) { 3594 case 0: 3595 case -NFS4ERR_WRONGSEC: 3596 goto out; 3597 default: 3598 err = nfs4_handle_exception(server, err, &exception); 3599 } 3600 } while (exception.retry); 3601 out: 3602 return err; 3603 } 3604 3605 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3606 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3607 { 3608 struct rpc_auth_create_args auth_args = { 3609 .pseudoflavor = flavor, 3610 }; 3611 struct rpc_auth *auth; 3612 3613 auth = rpcauth_create(&auth_args, server->client); 3614 if (IS_ERR(auth)) 3615 return -EACCES; 3616 return nfs4_lookup_root(server, fhandle, info); 3617 } 3618 3619 /* 3620 * Retry pseudoroot lookup with various security flavors. We do this when: 3621 * 3622 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3623 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3624 * 3625 * Returns zero on success, or a negative NFS4ERR value, or a 3626 * negative errno value. 3627 */ 3628 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3629 struct nfs_fsinfo *info) 3630 { 3631 /* Per 3530bis 15.33.5 */ 3632 static const rpc_authflavor_t flav_array[] = { 3633 RPC_AUTH_GSS_KRB5P, 3634 RPC_AUTH_GSS_KRB5I, 3635 RPC_AUTH_GSS_KRB5, 3636 RPC_AUTH_UNIX, /* courtesy */ 3637 RPC_AUTH_NULL, 3638 }; 3639 int status = -EPERM; 3640 size_t i; 3641 3642 if (server->auth_info.flavor_len > 0) { 3643 /* try each flavor specified by user */ 3644 for (i = 0; i < server->auth_info.flavor_len; i++) { 3645 status = nfs4_lookup_root_sec(server, fhandle, info, 3646 server->auth_info.flavors[i]); 3647 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3648 continue; 3649 break; 3650 } 3651 } else { 3652 /* no flavors specified by user, try default list */ 3653 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3654 status = nfs4_lookup_root_sec(server, fhandle, info, 3655 flav_array[i]); 3656 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3657 continue; 3658 break; 3659 } 3660 } 3661 3662 /* 3663 * -EACCESS could mean that the user doesn't have correct permissions 3664 * to access the mount. It could also mean that we tried to mount 3665 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3666 * existing mount programs don't handle -EACCES very well so it should 3667 * be mapped to -EPERM instead. 3668 */ 3669 if (status == -EACCES) 3670 status = -EPERM; 3671 return status; 3672 } 3673 3674 /** 3675 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3676 * @server: initialized nfs_server handle 3677 * @fhandle: we fill in the pseudo-fs root file handle 3678 * @info: we fill in an FSINFO struct 3679 * @auth_probe: probe the auth flavours 3680 * 3681 * Returns zero on success, or a negative errno. 3682 */ 3683 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3684 struct nfs_fsinfo *info, 3685 bool auth_probe) 3686 { 3687 int status = 0; 3688 3689 if (!auth_probe) 3690 status = nfs4_lookup_root(server, fhandle, info); 3691 3692 if (auth_probe || status == NFS4ERR_WRONGSEC) 3693 status = server->nfs_client->cl_mvops->find_root_sec(server, 3694 fhandle, info); 3695 3696 if (status == 0) 3697 status = nfs4_server_capabilities(server, fhandle); 3698 if (status == 0) 3699 status = nfs4_do_fsinfo(server, fhandle, info); 3700 3701 return nfs4_map_errors(status); 3702 } 3703 3704 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3705 struct nfs_fsinfo *info) 3706 { 3707 int error; 3708 struct nfs_fattr *fattr = info->fattr; 3709 struct nfs4_label *label = NULL; 3710 3711 error = nfs4_server_capabilities(server, mntfh); 3712 if (error < 0) { 3713 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3714 return error; 3715 } 3716 3717 label = nfs4_label_alloc(server, GFP_KERNEL); 3718 if (IS_ERR(label)) 3719 return PTR_ERR(label); 3720 3721 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3722 if (error < 0) { 3723 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3724 goto err_free_label; 3725 } 3726 3727 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3728 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3729 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3730 3731 err_free_label: 3732 nfs4_label_free(label); 3733 3734 return error; 3735 } 3736 3737 /* 3738 * Get locations and (maybe) other attributes of a referral. 3739 * Note that we'll actually follow the referral later when 3740 * we detect fsid mismatch in inode revalidation 3741 */ 3742 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3743 const struct qstr *name, struct nfs_fattr *fattr, 3744 struct nfs_fh *fhandle) 3745 { 3746 int status = -ENOMEM; 3747 struct page *page = NULL; 3748 struct nfs4_fs_locations *locations = NULL; 3749 3750 page = alloc_page(GFP_KERNEL); 3751 if (page == NULL) 3752 goto out; 3753 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3754 if (locations == NULL) 3755 goto out; 3756 3757 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3758 if (status != 0) 3759 goto out; 3760 3761 /* 3762 * If the fsid didn't change, this is a migration event, not a 3763 * referral. Cause us to drop into the exception handler, which 3764 * will kick off migration recovery. 3765 */ 3766 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3767 dprintk("%s: server did not return a different fsid for" 3768 " a referral at %s\n", __func__, name->name); 3769 status = -NFS4ERR_MOVED; 3770 goto out; 3771 } 3772 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3773 nfs_fixup_referral_attributes(&locations->fattr); 3774 3775 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3776 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3777 memset(fhandle, 0, sizeof(struct nfs_fh)); 3778 out: 3779 if (page) 3780 __free_page(page); 3781 kfree(locations); 3782 return status; 3783 } 3784 3785 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3786 struct nfs_fattr *fattr, struct nfs4_label *label) 3787 { 3788 struct nfs4_getattr_arg args = { 3789 .fh = fhandle, 3790 .bitmask = server->attr_bitmask, 3791 }; 3792 struct nfs4_getattr_res res = { 3793 .fattr = fattr, 3794 .label = label, 3795 .server = server, 3796 }; 3797 struct rpc_message msg = { 3798 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3799 .rpc_argp = &args, 3800 .rpc_resp = &res, 3801 }; 3802 3803 args.bitmask = nfs4_bitmask(server, label); 3804 3805 nfs_fattr_init(fattr); 3806 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3807 } 3808 3809 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3810 struct nfs_fattr *fattr, struct nfs4_label *label) 3811 { 3812 struct nfs4_exception exception = { }; 3813 int err; 3814 do { 3815 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3816 trace_nfs4_getattr(server, fhandle, fattr, err); 3817 err = nfs4_handle_exception(server, err, 3818 &exception); 3819 } while (exception.retry); 3820 return err; 3821 } 3822 3823 /* 3824 * The file is not closed if it is opened due to the a request to change 3825 * the size of the file. The open call will not be needed once the 3826 * VFS layer lookup-intents are implemented. 3827 * 3828 * Close is called when the inode is destroyed. 3829 * If we haven't opened the file for O_WRONLY, we 3830 * need to in the size_change case to obtain a stateid. 3831 * 3832 * Got race? 3833 * Because OPEN is always done by name in nfsv4, it is 3834 * possible that we opened a different file by the same 3835 * name. We can recognize this race condition, but we 3836 * can't do anything about it besides returning an error. 3837 * 3838 * This will be fixed with VFS changes (lookup-intent). 3839 */ 3840 static int 3841 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3842 struct iattr *sattr) 3843 { 3844 struct inode *inode = d_inode(dentry); 3845 struct rpc_cred *cred = NULL; 3846 struct nfs_open_context *ctx = NULL; 3847 struct nfs4_label *label = NULL; 3848 int status; 3849 3850 if (pnfs_ld_layoutret_on_setattr(inode) && 3851 sattr->ia_valid & ATTR_SIZE && 3852 sattr->ia_size < i_size_read(inode)) 3853 pnfs_commit_and_return_layout(inode); 3854 3855 nfs_fattr_init(fattr); 3856 3857 /* Deal with open(O_TRUNC) */ 3858 if (sattr->ia_valid & ATTR_OPEN) 3859 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3860 3861 /* Optimization: if the end result is no change, don't RPC */ 3862 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3863 return 0; 3864 3865 /* Search for an existing open(O_WRITE) file */ 3866 if (sattr->ia_valid & ATTR_FILE) { 3867 3868 ctx = nfs_file_open_context(sattr->ia_file); 3869 if (ctx) 3870 cred = ctx->cred; 3871 } 3872 3873 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3874 if (IS_ERR(label)) 3875 return PTR_ERR(label); 3876 3877 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label); 3878 if (status == 0) { 3879 nfs_setattr_update_inode(inode, sattr, fattr); 3880 nfs_setsecurity(inode, fattr, label); 3881 } 3882 nfs4_label_free(label); 3883 return status; 3884 } 3885 3886 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3887 const struct qstr *name, struct nfs_fh *fhandle, 3888 struct nfs_fattr *fattr, struct nfs4_label *label) 3889 { 3890 struct nfs_server *server = NFS_SERVER(dir); 3891 int status; 3892 struct nfs4_lookup_arg args = { 3893 .bitmask = server->attr_bitmask, 3894 .dir_fh = NFS_FH(dir), 3895 .name = name, 3896 }; 3897 struct nfs4_lookup_res res = { 3898 .server = server, 3899 .fattr = fattr, 3900 .label = label, 3901 .fh = fhandle, 3902 }; 3903 struct rpc_message msg = { 3904 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3905 .rpc_argp = &args, 3906 .rpc_resp = &res, 3907 }; 3908 3909 args.bitmask = nfs4_bitmask(server, label); 3910 3911 nfs_fattr_init(fattr); 3912 3913 dprintk("NFS call lookup %s\n", name->name); 3914 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3915 dprintk("NFS reply lookup: %d\n", status); 3916 return status; 3917 } 3918 3919 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3920 { 3921 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3922 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3923 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3924 fattr->nlink = 2; 3925 } 3926 3927 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3928 const struct qstr *name, struct nfs_fh *fhandle, 3929 struct nfs_fattr *fattr, struct nfs4_label *label) 3930 { 3931 struct nfs4_exception exception = { }; 3932 struct rpc_clnt *client = *clnt; 3933 int err; 3934 do { 3935 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3936 trace_nfs4_lookup(dir, name, err); 3937 switch (err) { 3938 case -NFS4ERR_BADNAME: 3939 err = -ENOENT; 3940 goto out; 3941 case -NFS4ERR_MOVED: 3942 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3943 if (err == -NFS4ERR_MOVED) 3944 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3945 goto out; 3946 case -NFS4ERR_WRONGSEC: 3947 err = -EPERM; 3948 if (client != *clnt) 3949 goto out; 3950 client = nfs4_negotiate_security(client, dir, name); 3951 if (IS_ERR(client)) 3952 return PTR_ERR(client); 3953 3954 exception.retry = 1; 3955 break; 3956 default: 3957 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3958 } 3959 } while (exception.retry); 3960 3961 out: 3962 if (err == 0) 3963 *clnt = client; 3964 else if (client != *clnt) 3965 rpc_shutdown_client(client); 3966 3967 return err; 3968 } 3969 3970 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 3971 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3972 struct nfs4_label *label) 3973 { 3974 int status; 3975 struct rpc_clnt *client = NFS_CLIENT(dir); 3976 3977 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3978 if (client != NFS_CLIENT(dir)) { 3979 rpc_shutdown_client(client); 3980 nfs_fixup_secinfo_attributes(fattr); 3981 } 3982 return status; 3983 } 3984 3985 struct rpc_clnt * 3986 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name, 3987 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3988 { 3989 struct rpc_clnt *client = NFS_CLIENT(dir); 3990 int status; 3991 3992 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3993 if (status < 0) 3994 return ERR_PTR(status); 3995 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3996 } 3997 3998 static int _nfs4_proc_lookupp(struct inode *inode, 3999 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 4000 struct nfs4_label *label) 4001 { 4002 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4003 struct nfs_server *server = NFS_SERVER(inode); 4004 int status; 4005 struct nfs4_lookupp_arg args = { 4006 .bitmask = server->attr_bitmask, 4007 .fh = NFS_FH(inode), 4008 }; 4009 struct nfs4_lookupp_res res = { 4010 .server = server, 4011 .fattr = fattr, 4012 .label = label, 4013 .fh = fhandle, 4014 }; 4015 struct rpc_message msg = { 4016 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4017 .rpc_argp = &args, 4018 .rpc_resp = &res, 4019 }; 4020 4021 args.bitmask = nfs4_bitmask(server, label); 4022 4023 nfs_fattr_init(fattr); 4024 4025 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4026 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4027 &res.seq_res, 0); 4028 dprintk("NFS reply lookupp: %d\n", status); 4029 return status; 4030 } 4031 4032 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4033 struct nfs_fattr *fattr, struct nfs4_label *label) 4034 { 4035 struct nfs4_exception exception = { }; 4036 int err; 4037 do { 4038 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label); 4039 trace_nfs4_lookupp(inode, err); 4040 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4041 &exception); 4042 } while (exception.retry); 4043 return err; 4044 } 4045 4046 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4047 { 4048 struct nfs_server *server = NFS_SERVER(inode); 4049 struct nfs4_accessargs args = { 4050 .fh = NFS_FH(inode), 4051 .bitmask = server->cache_consistency_bitmask, 4052 .access = entry->mask, 4053 }; 4054 struct nfs4_accessres res = { 4055 .server = server, 4056 }; 4057 struct rpc_message msg = { 4058 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4059 .rpc_argp = &args, 4060 .rpc_resp = &res, 4061 .rpc_cred = entry->cred, 4062 }; 4063 int status = 0; 4064 4065 res.fattr = nfs_alloc_fattr(); 4066 if (res.fattr == NULL) 4067 return -ENOMEM; 4068 4069 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4070 if (!status) { 4071 nfs_access_set_mask(entry, res.access); 4072 nfs_refresh_inode(inode, res.fattr); 4073 } 4074 nfs_free_fattr(res.fattr); 4075 return status; 4076 } 4077 4078 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 4079 { 4080 struct nfs4_exception exception = { }; 4081 int err; 4082 do { 4083 err = _nfs4_proc_access(inode, entry); 4084 trace_nfs4_access(inode, err); 4085 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4086 &exception); 4087 } while (exception.retry); 4088 return err; 4089 } 4090 4091 /* 4092 * TODO: For the time being, we don't try to get any attributes 4093 * along with any of the zero-copy operations READ, READDIR, 4094 * READLINK, WRITE. 4095 * 4096 * In the case of the first three, we want to put the GETATTR 4097 * after the read-type operation -- this is because it is hard 4098 * to predict the length of a GETATTR response in v4, and thus 4099 * align the READ data correctly. This means that the GETATTR 4100 * may end up partially falling into the page cache, and we should 4101 * shift it into the 'tail' of the xdr_buf before processing. 4102 * To do this efficiently, we need to know the total length 4103 * of data received, which doesn't seem to be available outside 4104 * of the RPC layer. 4105 * 4106 * In the case of WRITE, we also want to put the GETATTR after 4107 * the operation -- in this case because we want to make sure 4108 * we get the post-operation mtime and size. 4109 * 4110 * Both of these changes to the XDR layer would in fact be quite 4111 * minor, but I decided to leave them for a subsequent patch. 4112 */ 4113 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4114 unsigned int pgbase, unsigned int pglen) 4115 { 4116 struct nfs4_readlink args = { 4117 .fh = NFS_FH(inode), 4118 .pgbase = pgbase, 4119 .pglen = pglen, 4120 .pages = &page, 4121 }; 4122 struct nfs4_readlink_res res; 4123 struct rpc_message msg = { 4124 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4125 .rpc_argp = &args, 4126 .rpc_resp = &res, 4127 }; 4128 4129 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4130 } 4131 4132 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4133 unsigned int pgbase, unsigned int pglen) 4134 { 4135 struct nfs4_exception exception = { }; 4136 int err; 4137 do { 4138 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4139 trace_nfs4_readlink(inode, err); 4140 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4141 &exception); 4142 } while (exception.retry); 4143 return err; 4144 } 4145 4146 /* 4147 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4148 */ 4149 static int 4150 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4151 int flags) 4152 { 4153 struct nfs_server *server = NFS_SERVER(dir); 4154 struct nfs4_label l, *ilabel = NULL; 4155 struct nfs_open_context *ctx; 4156 struct nfs4_state *state; 4157 int status = 0; 4158 4159 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4160 if (IS_ERR(ctx)) 4161 return PTR_ERR(ctx); 4162 4163 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4164 4165 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4166 sattr->ia_mode &= ~current_umask(); 4167 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4168 if (IS_ERR(state)) { 4169 status = PTR_ERR(state); 4170 goto out; 4171 } 4172 out: 4173 nfs4_label_release_security(ilabel); 4174 put_nfs_open_context(ctx); 4175 return status; 4176 } 4177 4178 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) 4179 { 4180 struct nfs_server *server = NFS_SERVER(dir); 4181 struct nfs_removeargs args = { 4182 .fh = NFS_FH(dir), 4183 .name = *name, 4184 }; 4185 struct nfs_removeres res = { 4186 .server = server, 4187 }; 4188 struct rpc_message msg = { 4189 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4190 .rpc_argp = &args, 4191 .rpc_resp = &res, 4192 }; 4193 unsigned long timestamp = jiffies; 4194 int status; 4195 4196 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4197 if (status == 0) 4198 update_changeattr(dir, &res.cinfo, timestamp); 4199 return status; 4200 } 4201 4202 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name) 4203 { 4204 struct nfs4_exception exception = { }; 4205 int err; 4206 do { 4207 err = _nfs4_proc_remove(dir, name); 4208 trace_nfs4_remove(dir, name, err); 4209 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4210 &exception); 4211 } while (exception.retry); 4212 return err; 4213 } 4214 4215 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 4216 { 4217 struct nfs_server *server = NFS_SERVER(dir); 4218 struct nfs_removeargs *args = msg->rpc_argp; 4219 struct nfs_removeres *res = msg->rpc_resp; 4220 4221 res->server = server; 4222 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4223 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 4224 4225 nfs_fattr_init(res->dir_attr); 4226 } 4227 4228 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4229 { 4230 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4231 &data->args.seq_args, 4232 &data->res.seq_res, 4233 task); 4234 } 4235 4236 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4237 { 4238 struct nfs_unlinkdata *data = task->tk_calldata; 4239 struct nfs_removeres *res = &data->res; 4240 4241 if (!nfs4_sequence_done(task, &res->seq_res)) 4242 return 0; 4243 if (nfs4_async_handle_error(task, res->server, NULL, 4244 &data->timeout) == -EAGAIN) 4245 return 0; 4246 if (task->tk_status == 0) 4247 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start); 4248 return 1; 4249 } 4250 4251 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 4252 { 4253 struct nfs_server *server = NFS_SERVER(dir); 4254 struct nfs_renameargs *arg = msg->rpc_argp; 4255 struct nfs_renameres *res = msg->rpc_resp; 4256 4257 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4258 res->server = server; 4259 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 4260 } 4261 4262 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4263 { 4264 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4265 &data->args.seq_args, 4266 &data->res.seq_res, 4267 task); 4268 } 4269 4270 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4271 struct inode *new_dir) 4272 { 4273 struct nfs_renamedata *data = task->tk_calldata; 4274 struct nfs_renameres *res = &data->res; 4275 4276 if (!nfs4_sequence_done(task, &res->seq_res)) 4277 return 0; 4278 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4279 return 0; 4280 4281 if (task->tk_status == 0) { 4282 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start); 4283 if (new_dir != old_dir) 4284 update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start); 4285 } 4286 return 1; 4287 } 4288 4289 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4290 { 4291 struct nfs_server *server = NFS_SERVER(inode); 4292 struct nfs4_link_arg arg = { 4293 .fh = NFS_FH(inode), 4294 .dir_fh = NFS_FH(dir), 4295 .name = name, 4296 .bitmask = server->attr_bitmask, 4297 }; 4298 struct nfs4_link_res res = { 4299 .server = server, 4300 .label = NULL, 4301 }; 4302 struct rpc_message msg = { 4303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4304 .rpc_argp = &arg, 4305 .rpc_resp = &res, 4306 }; 4307 int status = -ENOMEM; 4308 4309 res.fattr = nfs_alloc_fattr(); 4310 if (res.fattr == NULL) 4311 goto out; 4312 4313 res.label = nfs4_label_alloc(server, GFP_KERNEL); 4314 if (IS_ERR(res.label)) { 4315 status = PTR_ERR(res.label); 4316 goto out; 4317 } 4318 arg.bitmask = nfs4_bitmask(server, res.label); 4319 4320 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4321 if (!status) { 4322 update_changeattr(dir, &res.cinfo, res.fattr->time_start); 4323 status = nfs_post_op_update_inode(inode, res.fattr); 4324 if (!status) 4325 nfs_setsecurity(inode, res.fattr, res.label); 4326 } 4327 4328 4329 nfs4_label_free(res.label); 4330 4331 out: 4332 nfs_free_fattr(res.fattr); 4333 return status; 4334 } 4335 4336 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4337 { 4338 struct nfs4_exception exception = { }; 4339 int err; 4340 do { 4341 err = nfs4_handle_exception(NFS_SERVER(inode), 4342 _nfs4_proc_link(inode, dir, name), 4343 &exception); 4344 } while (exception.retry); 4345 return err; 4346 } 4347 4348 struct nfs4_createdata { 4349 struct rpc_message msg; 4350 struct nfs4_create_arg arg; 4351 struct nfs4_create_res res; 4352 struct nfs_fh fh; 4353 struct nfs_fattr fattr; 4354 struct nfs4_label *label; 4355 }; 4356 4357 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4358 const struct qstr *name, struct iattr *sattr, u32 ftype) 4359 { 4360 struct nfs4_createdata *data; 4361 4362 data = kzalloc(sizeof(*data), GFP_KERNEL); 4363 if (data != NULL) { 4364 struct nfs_server *server = NFS_SERVER(dir); 4365 4366 data->label = nfs4_label_alloc(server, GFP_KERNEL); 4367 if (IS_ERR(data->label)) 4368 goto out_free; 4369 4370 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4371 data->msg.rpc_argp = &data->arg; 4372 data->msg.rpc_resp = &data->res; 4373 data->arg.dir_fh = NFS_FH(dir); 4374 data->arg.server = server; 4375 data->arg.name = name; 4376 data->arg.attrs = sattr; 4377 data->arg.ftype = ftype; 4378 data->arg.bitmask = nfs4_bitmask(server, data->label); 4379 data->arg.umask = current_umask(); 4380 data->res.server = server; 4381 data->res.fh = &data->fh; 4382 data->res.fattr = &data->fattr; 4383 data->res.label = data->label; 4384 nfs_fattr_init(data->res.fattr); 4385 } 4386 return data; 4387 out_free: 4388 kfree(data); 4389 return NULL; 4390 } 4391 4392 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4393 { 4394 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4395 &data->arg.seq_args, &data->res.seq_res, 1); 4396 if (status == 0) { 4397 update_changeattr(dir, &data->res.dir_cinfo, 4398 data->res.fattr->time_start); 4399 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 4400 } 4401 return status; 4402 } 4403 4404 static void nfs4_free_createdata(struct nfs4_createdata *data) 4405 { 4406 nfs4_label_free(data->label); 4407 kfree(data); 4408 } 4409 4410 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4411 struct page *page, unsigned int len, struct iattr *sattr, 4412 struct nfs4_label *label) 4413 { 4414 struct nfs4_createdata *data; 4415 int status = -ENAMETOOLONG; 4416 4417 if (len > NFS4_MAXPATHLEN) 4418 goto out; 4419 4420 status = -ENOMEM; 4421 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 4422 if (data == NULL) 4423 goto out; 4424 4425 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 4426 data->arg.u.symlink.pages = &page; 4427 data->arg.u.symlink.len = len; 4428 data->arg.label = label; 4429 4430 status = nfs4_do_create(dir, dentry, data); 4431 4432 nfs4_free_createdata(data); 4433 out: 4434 return status; 4435 } 4436 4437 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4438 struct page *page, unsigned int len, struct iattr *sattr) 4439 { 4440 struct nfs4_exception exception = { }; 4441 struct nfs4_label l, *label = NULL; 4442 int err; 4443 4444 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4445 4446 do { 4447 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4448 trace_nfs4_symlink(dir, &dentry->d_name, err); 4449 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4450 &exception); 4451 } while (exception.retry); 4452 4453 nfs4_label_release_security(label); 4454 return err; 4455 } 4456 4457 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4458 struct iattr *sattr, struct nfs4_label *label) 4459 { 4460 struct nfs4_createdata *data; 4461 int status = -ENOMEM; 4462 4463 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4464 if (data == NULL) 4465 goto out; 4466 4467 data->arg.label = label; 4468 status = nfs4_do_create(dir, dentry, data); 4469 4470 nfs4_free_createdata(data); 4471 out: 4472 return status; 4473 } 4474 4475 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4476 struct iattr *sattr) 4477 { 4478 struct nfs_server *server = NFS_SERVER(dir); 4479 struct nfs4_exception exception = { }; 4480 struct nfs4_label l, *label = NULL; 4481 int err; 4482 4483 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4484 4485 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4486 sattr->ia_mode &= ~current_umask(); 4487 do { 4488 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4489 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4490 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4491 &exception); 4492 } while (exception.retry); 4493 nfs4_label_release_security(label); 4494 4495 return err; 4496 } 4497 4498 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4499 u64 cookie, struct page **pages, unsigned int count, bool plus) 4500 { 4501 struct inode *dir = d_inode(dentry); 4502 struct nfs4_readdir_arg args = { 4503 .fh = NFS_FH(dir), 4504 .pages = pages, 4505 .pgbase = 0, 4506 .count = count, 4507 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4508 .plus = plus, 4509 }; 4510 struct nfs4_readdir_res res; 4511 struct rpc_message msg = { 4512 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4513 .rpc_argp = &args, 4514 .rpc_resp = &res, 4515 .rpc_cred = cred, 4516 }; 4517 int status; 4518 4519 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4520 dentry, 4521 (unsigned long long)cookie); 4522 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4523 res.pgbase = args.pgbase; 4524 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4525 if (status >= 0) { 4526 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4527 status += args.pgbase; 4528 } 4529 4530 nfs_invalidate_atime(dir); 4531 4532 dprintk("%s: returns %d\n", __func__, status); 4533 return status; 4534 } 4535 4536 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4537 u64 cookie, struct page **pages, unsigned int count, bool plus) 4538 { 4539 struct nfs4_exception exception = { }; 4540 int err; 4541 do { 4542 err = _nfs4_proc_readdir(dentry, cred, cookie, 4543 pages, count, plus); 4544 trace_nfs4_readdir(d_inode(dentry), err); 4545 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4546 &exception); 4547 } while (exception.retry); 4548 return err; 4549 } 4550 4551 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4552 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4553 { 4554 struct nfs4_createdata *data; 4555 int mode = sattr->ia_mode; 4556 int status = -ENOMEM; 4557 4558 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4559 if (data == NULL) 4560 goto out; 4561 4562 if (S_ISFIFO(mode)) 4563 data->arg.ftype = NF4FIFO; 4564 else if (S_ISBLK(mode)) { 4565 data->arg.ftype = NF4BLK; 4566 data->arg.u.device.specdata1 = MAJOR(rdev); 4567 data->arg.u.device.specdata2 = MINOR(rdev); 4568 } 4569 else if (S_ISCHR(mode)) { 4570 data->arg.ftype = NF4CHR; 4571 data->arg.u.device.specdata1 = MAJOR(rdev); 4572 data->arg.u.device.specdata2 = MINOR(rdev); 4573 } else if (!S_ISSOCK(mode)) { 4574 status = -EINVAL; 4575 goto out_free; 4576 } 4577 4578 data->arg.label = label; 4579 status = nfs4_do_create(dir, dentry, data); 4580 out_free: 4581 nfs4_free_createdata(data); 4582 out: 4583 return status; 4584 } 4585 4586 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4587 struct iattr *sattr, dev_t rdev) 4588 { 4589 struct nfs_server *server = NFS_SERVER(dir); 4590 struct nfs4_exception exception = { }; 4591 struct nfs4_label l, *label = NULL; 4592 int err; 4593 4594 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4595 4596 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4597 sattr->ia_mode &= ~current_umask(); 4598 do { 4599 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 4600 trace_nfs4_mknod(dir, &dentry->d_name, err); 4601 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4602 &exception); 4603 } while (exception.retry); 4604 4605 nfs4_label_release_security(label); 4606 4607 return err; 4608 } 4609 4610 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 4611 struct nfs_fsstat *fsstat) 4612 { 4613 struct nfs4_statfs_arg args = { 4614 .fh = fhandle, 4615 .bitmask = server->attr_bitmask, 4616 }; 4617 struct nfs4_statfs_res res = { 4618 .fsstat = fsstat, 4619 }; 4620 struct rpc_message msg = { 4621 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 4622 .rpc_argp = &args, 4623 .rpc_resp = &res, 4624 }; 4625 4626 nfs_fattr_init(fsstat->fattr); 4627 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4628 } 4629 4630 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 4631 { 4632 struct nfs4_exception exception = { }; 4633 int err; 4634 do { 4635 err = nfs4_handle_exception(server, 4636 _nfs4_proc_statfs(server, fhandle, fsstat), 4637 &exception); 4638 } while (exception.retry); 4639 return err; 4640 } 4641 4642 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 4643 struct nfs_fsinfo *fsinfo) 4644 { 4645 struct nfs4_fsinfo_arg args = { 4646 .fh = fhandle, 4647 .bitmask = server->attr_bitmask, 4648 }; 4649 struct nfs4_fsinfo_res res = { 4650 .fsinfo = fsinfo, 4651 }; 4652 struct rpc_message msg = { 4653 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 4654 .rpc_argp = &args, 4655 .rpc_resp = &res, 4656 }; 4657 4658 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4659 } 4660 4661 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4662 { 4663 struct nfs4_exception exception = { }; 4664 unsigned long now = jiffies; 4665 int err; 4666 4667 do { 4668 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4669 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4670 if (err == 0) { 4671 nfs4_set_lease_period(server->nfs_client, 4672 fsinfo->lease_time * HZ, 4673 now); 4674 break; 4675 } 4676 err = nfs4_handle_exception(server, err, &exception); 4677 } while (exception.retry); 4678 return err; 4679 } 4680 4681 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4682 { 4683 int error; 4684 4685 nfs_fattr_init(fsinfo->fattr); 4686 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4687 if (error == 0) { 4688 /* block layout checks this! */ 4689 server->pnfs_blksize = fsinfo->blksize; 4690 set_pnfs_layoutdriver(server, fhandle, fsinfo); 4691 } 4692 4693 return error; 4694 } 4695 4696 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4697 struct nfs_pathconf *pathconf) 4698 { 4699 struct nfs4_pathconf_arg args = { 4700 .fh = fhandle, 4701 .bitmask = server->attr_bitmask, 4702 }; 4703 struct nfs4_pathconf_res res = { 4704 .pathconf = pathconf, 4705 }; 4706 struct rpc_message msg = { 4707 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4708 .rpc_argp = &args, 4709 .rpc_resp = &res, 4710 }; 4711 4712 /* None of the pathconf attributes are mandatory to implement */ 4713 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4714 memset(pathconf, 0, sizeof(*pathconf)); 4715 return 0; 4716 } 4717 4718 nfs_fattr_init(pathconf->fattr); 4719 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4720 } 4721 4722 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4723 struct nfs_pathconf *pathconf) 4724 { 4725 struct nfs4_exception exception = { }; 4726 int err; 4727 4728 do { 4729 err = nfs4_handle_exception(server, 4730 _nfs4_proc_pathconf(server, fhandle, pathconf), 4731 &exception); 4732 } while (exception.retry); 4733 return err; 4734 } 4735 4736 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4737 const struct nfs_open_context *ctx, 4738 const struct nfs_lock_context *l_ctx, 4739 fmode_t fmode) 4740 { 4741 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 4742 } 4743 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4744 4745 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4746 const struct nfs_open_context *ctx, 4747 const struct nfs_lock_context *l_ctx, 4748 fmode_t fmode) 4749 { 4750 nfs4_stateid current_stateid; 4751 4752 /* If the current stateid represents a lost lock, then exit */ 4753 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4754 return true; 4755 return nfs4_stateid_match(stateid, ¤t_stateid); 4756 } 4757 4758 static bool nfs4_error_stateid_expired(int err) 4759 { 4760 switch (err) { 4761 case -NFS4ERR_DELEG_REVOKED: 4762 case -NFS4ERR_ADMIN_REVOKED: 4763 case -NFS4ERR_BAD_STATEID: 4764 case -NFS4ERR_STALE_STATEID: 4765 case -NFS4ERR_OLD_STATEID: 4766 case -NFS4ERR_OPENMODE: 4767 case -NFS4ERR_EXPIRED: 4768 return true; 4769 } 4770 return false; 4771 } 4772 4773 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4774 { 4775 struct nfs_server *server = NFS_SERVER(hdr->inode); 4776 4777 trace_nfs4_read(hdr, task->tk_status); 4778 if (task->tk_status < 0) { 4779 struct nfs4_exception exception = { 4780 .inode = hdr->inode, 4781 .state = hdr->args.context->state, 4782 .stateid = &hdr->args.stateid, 4783 }; 4784 task->tk_status = nfs4_async_handle_exception(task, 4785 server, task->tk_status, &exception); 4786 if (exception.retry) { 4787 rpc_restart_call_prepare(task); 4788 return -EAGAIN; 4789 } 4790 } 4791 4792 if (task->tk_status > 0) 4793 renew_lease(server, hdr->timestamp); 4794 return 0; 4795 } 4796 4797 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4798 struct nfs_pgio_args *args) 4799 { 4800 4801 if (!nfs4_error_stateid_expired(task->tk_status) || 4802 nfs4_stateid_is_current(&args->stateid, 4803 args->context, 4804 args->lock_context, 4805 FMODE_READ)) 4806 return false; 4807 rpc_restart_call_prepare(task); 4808 return true; 4809 } 4810 4811 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4812 { 4813 4814 dprintk("--> %s\n", __func__); 4815 4816 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4817 return -EAGAIN; 4818 if (nfs4_read_stateid_changed(task, &hdr->args)) 4819 return -EAGAIN; 4820 if (task->tk_status > 0) 4821 nfs_invalidate_atime(hdr->inode); 4822 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4823 nfs4_read_done_cb(task, hdr); 4824 } 4825 4826 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4827 struct rpc_message *msg) 4828 { 4829 hdr->timestamp = jiffies; 4830 if (!hdr->pgio_done_cb) 4831 hdr->pgio_done_cb = nfs4_read_done_cb; 4832 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4833 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); 4834 } 4835 4836 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4837 struct nfs_pgio_header *hdr) 4838 { 4839 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 4840 &hdr->args.seq_args, 4841 &hdr->res.seq_res, 4842 task)) 4843 return 0; 4844 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4845 hdr->args.lock_context, 4846 hdr->rw_mode) == -EIO) 4847 return -EIO; 4848 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4849 return -EIO; 4850 return 0; 4851 } 4852 4853 static int nfs4_write_done_cb(struct rpc_task *task, 4854 struct nfs_pgio_header *hdr) 4855 { 4856 struct inode *inode = hdr->inode; 4857 4858 trace_nfs4_write(hdr, task->tk_status); 4859 if (task->tk_status < 0) { 4860 struct nfs4_exception exception = { 4861 .inode = hdr->inode, 4862 .state = hdr->args.context->state, 4863 .stateid = &hdr->args.stateid, 4864 }; 4865 task->tk_status = nfs4_async_handle_exception(task, 4866 NFS_SERVER(inode), task->tk_status, 4867 &exception); 4868 if (exception.retry) { 4869 rpc_restart_call_prepare(task); 4870 return -EAGAIN; 4871 } 4872 } 4873 if (task->tk_status >= 0) { 4874 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4875 nfs_writeback_update_inode(hdr); 4876 } 4877 return 0; 4878 } 4879 4880 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4881 struct nfs_pgio_args *args) 4882 { 4883 4884 if (!nfs4_error_stateid_expired(task->tk_status) || 4885 nfs4_stateid_is_current(&args->stateid, 4886 args->context, 4887 args->lock_context, 4888 FMODE_WRITE)) 4889 return false; 4890 rpc_restart_call_prepare(task); 4891 return true; 4892 } 4893 4894 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4895 { 4896 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4897 return -EAGAIN; 4898 if (nfs4_write_stateid_changed(task, &hdr->args)) 4899 return -EAGAIN; 4900 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4901 nfs4_write_done_cb(task, hdr); 4902 } 4903 4904 static 4905 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4906 { 4907 /* Don't request attributes for pNFS or O_DIRECT writes */ 4908 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4909 return false; 4910 /* Otherwise, request attributes if and only if we don't hold 4911 * a delegation 4912 */ 4913 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4914 } 4915 4916 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4917 struct rpc_message *msg) 4918 { 4919 struct nfs_server *server = NFS_SERVER(hdr->inode); 4920 4921 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4922 hdr->args.bitmask = NULL; 4923 hdr->res.fattr = NULL; 4924 } else 4925 hdr->args.bitmask = server->cache_consistency_bitmask; 4926 4927 if (!hdr->pgio_done_cb) 4928 hdr->pgio_done_cb = nfs4_write_done_cb; 4929 hdr->res.server = server; 4930 hdr->timestamp = jiffies; 4931 4932 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4933 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1); 4934 } 4935 4936 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4937 { 4938 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 4939 &data->args.seq_args, 4940 &data->res.seq_res, 4941 task); 4942 } 4943 4944 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4945 { 4946 struct inode *inode = data->inode; 4947 4948 trace_nfs4_commit(data, task->tk_status); 4949 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4950 NULL, NULL) == -EAGAIN) { 4951 rpc_restart_call_prepare(task); 4952 return -EAGAIN; 4953 } 4954 return 0; 4955 } 4956 4957 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4958 { 4959 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4960 return -EAGAIN; 4961 return data->commit_done_cb(task, data); 4962 } 4963 4964 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4965 { 4966 struct nfs_server *server = NFS_SERVER(data->inode); 4967 4968 if (data->commit_done_cb == NULL) 4969 data->commit_done_cb = nfs4_commit_done_cb; 4970 data->res.server = server; 4971 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4972 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4973 } 4974 4975 struct nfs4_renewdata { 4976 struct nfs_client *client; 4977 unsigned long timestamp; 4978 }; 4979 4980 /* 4981 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4982 * standalone procedure for queueing an asynchronous RENEW. 4983 */ 4984 static void nfs4_renew_release(void *calldata) 4985 { 4986 struct nfs4_renewdata *data = calldata; 4987 struct nfs_client *clp = data->client; 4988 4989 if (refcount_read(&clp->cl_count) > 1) 4990 nfs4_schedule_state_renewal(clp); 4991 nfs_put_client(clp); 4992 kfree(data); 4993 } 4994 4995 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4996 { 4997 struct nfs4_renewdata *data = calldata; 4998 struct nfs_client *clp = data->client; 4999 unsigned long timestamp = data->timestamp; 5000 5001 trace_nfs4_renew_async(clp, task->tk_status); 5002 switch (task->tk_status) { 5003 case 0: 5004 break; 5005 case -NFS4ERR_LEASE_MOVED: 5006 nfs4_schedule_lease_moved_recovery(clp); 5007 break; 5008 default: 5009 /* Unless we're shutting down, schedule state recovery! */ 5010 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5011 return; 5012 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5013 nfs4_schedule_lease_recovery(clp); 5014 return; 5015 } 5016 nfs4_schedule_path_down_recovery(clp); 5017 } 5018 do_renew_lease(clp, timestamp); 5019 } 5020 5021 static const struct rpc_call_ops nfs4_renew_ops = { 5022 .rpc_call_done = nfs4_renew_done, 5023 .rpc_release = nfs4_renew_release, 5024 }; 5025 5026 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 5027 { 5028 struct rpc_message msg = { 5029 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5030 .rpc_argp = clp, 5031 .rpc_cred = cred, 5032 }; 5033 struct nfs4_renewdata *data; 5034 5035 if (renew_flags == 0) 5036 return 0; 5037 if (!refcount_inc_not_zero(&clp->cl_count)) 5038 return -EIO; 5039 data = kmalloc(sizeof(*data), GFP_NOFS); 5040 if (data == NULL) { 5041 nfs_put_client(clp); 5042 return -ENOMEM; 5043 } 5044 data->client = clp; 5045 data->timestamp = jiffies; 5046 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5047 &nfs4_renew_ops, data); 5048 } 5049 5050 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 5051 { 5052 struct rpc_message msg = { 5053 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5054 .rpc_argp = clp, 5055 .rpc_cred = cred, 5056 }; 5057 unsigned long now = jiffies; 5058 int status; 5059 5060 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5061 if (status < 0) 5062 return status; 5063 do_renew_lease(clp, now); 5064 return 0; 5065 } 5066 5067 static inline int nfs4_server_supports_acls(struct nfs_server *server) 5068 { 5069 return server->caps & NFS_CAP_ACLS; 5070 } 5071 5072 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5073 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5074 * the stack. 5075 */ 5076 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5077 5078 static int buf_to_pages_noslab(const void *buf, size_t buflen, 5079 struct page **pages) 5080 { 5081 struct page *newpage, **spages; 5082 int rc = 0; 5083 size_t len; 5084 spages = pages; 5085 5086 do { 5087 len = min_t(size_t, PAGE_SIZE, buflen); 5088 newpage = alloc_page(GFP_KERNEL); 5089 5090 if (newpage == NULL) 5091 goto unwind; 5092 memcpy(page_address(newpage), buf, len); 5093 buf += len; 5094 buflen -= len; 5095 *pages++ = newpage; 5096 rc++; 5097 } while (buflen != 0); 5098 5099 return rc; 5100 5101 unwind: 5102 for(; rc > 0; rc--) 5103 __free_page(spages[rc-1]); 5104 return -ENOMEM; 5105 } 5106 5107 struct nfs4_cached_acl { 5108 int cached; 5109 size_t len; 5110 char data[0]; 5111 }; 5112 5113 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5114 { 5115 struct nfs_inode *nfsi = NFS_I(inode); 5116 5117 spin_lock(&inode->i_lock); 5118 kfree(nfsi->nfs4_acl); 5119 nfsi->nfs4_acl = acl; 5120 spin_unlock(&inode->i_lock); 5121 } 5122 5123 static void nfs4_zap_acl_attr(struct inode *inode) 5124 { 5125 nfs4_set_cached_acl(inode, NULL); 5126 } 5127 5128 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 5129 { 5130 struct nfs_inode *nfsi = NFS_I(inode); 5131 struct nfs4_cached_acl *acl; 5132 int ret = -ENOENT; 5133 5134 spin_lock(&inode->i_lock); 5135 acl = nfsi->nfs4_acl; 5136 if (acl == NULL) 5137 goto out; 5138 if (buf == NULL) /* user is just asking for length */ 5139 goto out_len; 5140 if (acl->cached == 0) 5141 goto out; 5142 ret = -ERANGE; /* see getxattr(2) man page */ 5143 if (acl->len > buflen) 5144 goto out; 5145 memcpy(buf, acl->data, acl->len); 5146 out_len: 5147 ret = acl->len; 5148 out: 5149 spin_unlock(&inode->i_lock); 5150 return ret; 5151 } 5152 5153 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 5154 { 5155 struct nfs4_cached_acl *acl; 5156 size_t buflen = sizeof(*acl) + acl_len; 5157 5158 if (buflen <= PAGE_SIZE) { 5159 acl = kmalloc(buflen, GFP_KERNEL); 5160 if (acl == NULL) 5161 goto out; 5162 acl->cached = 1; 5163 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5164 } else { 5165 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5166 if (acl == NULL) 5167 goto out; 5168 acl->cached = 0; 5169 } 5170 acl->len = acl_len; 5171 out: 5172 nfs4_set_cached_acl(inode, acl); 5173 } 5174 5175 /* 5176 * The getxattr API returns the required buffer length when called with a 5177 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5178 * the required buf. On a NULL buf, we send a page of data to the server 5179 * guessing that the ACL request can be serviced by a page. If so, we cache 5180 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5181 * the cache. If not so, we throw away the page, and cache the required 5182 * length. The next getxattr call will then produce another round trip to 5183 * the server, this time with the input buf of the required size. 5184 */ 5185 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5186 { 5187 struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, }; 5188 struct nfs_getaclargs args = { 5189 .fh = NFS_FH(inode), 5190 .acl_pages = pages, 5191 .acl_len = buflen, 5192 }; 5193 struct nfs_getaclres res = { 5194 .acl_len = buflen, 5195 }; 5196 struct rpc_message msg = { 5197 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5198 .rpc_argp = &args, 5199 .rpc_resp = &res, 5200 }; 5201 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5202 int ret = -ENOMEM, i; 5203 5204 if (npages > ARRAY_SIZE(pages)) 5205 return -ERANGE; 5206 5207 for (i = 0; i < npages; i++) { 5208 pages[i] = alloc_page(GFP_KERNEL); 5209 if (!pages[i]) 5210 goto out_free; 5211 } 5212 5213 /* for decoding across pages */ 5214 res.acl_scratch = alloc_page(GFP_KERNEL); 5215 if (!res.acl_scratch) 5216 goto out_free; 5217 5218 args.acl_len = npages * PAGE_SIZE; 5219 5220 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5221 __func__, buf, buflen, npages, args.acl_len); 5222 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5223 &msg, &args.seq_args, &res.seq_res, 0); 5224 if (ret) 5225 goto out_free; 5226 5227 /* Handle the case where the passed-in buffer is too short */ 5228 if (res.acl_flags & NFS4_ACL_TRUNC) { 5229 /* Did the user only issue a request for the acl length? */ 5230 if (buf == NULL) 5231 goto out_ok; 5232 ret = -ERANGE; 5233 goto out_free; 5234 } 5235 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 5236 if (buf) { 5237 if (res.acl_len > buflen) { 5238 ret = -ERANGE; 5239 goto out_free; 5240 } 5241 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5242 } 5243 out_ok: 5244 ret = res.acl_len; 5245 out_free: 5246 for (i = 0; i < npages; i++) 5247 if (pages[i]) 5248 __free_page(pages[i]); 5249 if (res.acl_scratch) 5250 __free_page(res.acl_scratch); 5251 return ret; 5252 } 5253 5254 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 5255 { 5256 struct nfs4_exception exception = { }; 5257 ssize_t ret; 5258 do { 5259 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 5260 trace_nfs4_get_acl(inode, ret); 5261 if (ret >= 0) 5262 break; 5263 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 5264 } while (exception.retry); 5265 return ret; 5266 } 5267 5268 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 5269 { 5270 struct nfs_server *server = NFS_SERVER(inode); 5271 int ret; 5272 5273 if (!nfs4_server_supports_acls(server)) 5274 return -EOPNOTSUPP; 5275 ret = nfs_revalidate_inode(server, inode); 5276 if (ret < 0) 5277 return ret; 5278 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 5279 nfs_zap_acl_cache(inode); 5280 ret = nfs4_read_cached_acl(inode, buf, buflen); 5281 if (ret != -ENOENT) 5282 /* -ENOENT is returned if there is no ACL or if there is an ACL 5283 * but no cached acl data, just the acl length */ 5284 return ret; 5285 return nfs4_get_acl_uncached(inode, buf, buflen); 5286 } 5287 5288 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5289 { 5290 struct nfs_server *server = NFS_SERVER(inode); 5291 struct page *pages[NFS4ACL_MAXPAGES]; 5292 struct nfs_setaclargs arg = { 5293 .fh = NFS_FH(inode), 5294 .acl_pages = pages, 5295 .acl_len = buflen, 5296 }; 5297 struct nfs_setaclres res; 5298 struct rpc_message msg = { 5299 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 5300 .rpc_argp = &arg, 5301 .rpc_resp = &res, 5302 }; 5303 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 5304 int ret, i; 5305 5306 if (!nfs4_server_supports_acls(server)) 5307 return -EOPNOTSUPP; 5308 if (npages > ARRAY_SIZE(pages)) 5309 return -ERANGE; 5310 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages); 5311 if (i < 0) 5312 return i; 5313 nfs4_inode_return_delegation(inode); 5314 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5315 5316 /* 5317 * Free each page after tx, so the only ref left is 5318 * held by the network stack 5319 */ 5320 for (; i > 0; i--) 5321 put_page(pages[i-1]); 5322 5323 /* 5324 * Acl update can result in inode attribute update. 5325 * so mark the attribute cache invalid. 5326 */ 5327 spin_lock(&inode->i_lock); 5328 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 5329 spin_unlock(&inode->i_lock); 5330 nfs_access_zap_cache(inode); 5331 nfs_zap_acl_cache(inode); 5332 return ret; 5333 } 5334 5335 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 5336 { 5337 struct nfs4_exception exception = { }; 5338 int err; 5339 do { 5340 err = __nfs4_proc_set_acl(inode, buf, buflen); 5341 trace_nfs4_set_acl(inode, err); 5342 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5343 &exception); 5344 } while (exception.retry); 5345 return err; 5346 } 5347 5348 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5349 static int _nfs4_get_security_label(struct inode *inode, void *buf, 5350 size_t buflen) 5351 { 5352 struct nfs_server *server = NFS_SERVER(inode); 5353 struct nfs_fattr fattr; 5354 struct nfs4_label label = {0, 0, buflen, buf}; 5355 5356 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5357 struct nfs4_getattr_arg arg = { 5358 .fh = NFS_FH(inode), 5359 .bitmask = bitmask, 5360 }; 5361 struct nfs4_getattr_res res = { 5362 .fattr = &fattr, 5363 .label = &label, 5364 .server = server, 5365 }; 5366 struct rpc_message msg = { 5367 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 5368 .rpc_argp = &arg, 5369 .rpc_resp = &res, 5370 }; 5371 int ret; 5372 5373 nfs_fattr_init(&fattr); 5374 5375 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 5376 if (ret) 5377 return ret; 5378 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 5379 return -ENOENT; 5380 if (buflen < label.len) 5381 return -ERANGE; 5382 return 0; 5383 } 5384 5385 static int nfs4_get_security_label(struct inode *inode, void *buf, 5386 size_t buflen) 5387 { 5388 struct nfs4_exception exception = { }; 5389 int err; 5390 5391 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5392 return -EOPNOTSUPP; 5393 5394 do { 5395 err = _nfs4_get_security_label(inode, buf, buflen); 5396 trace_nfs4_get_security_label(inode, err); 5397 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5398 &exception); 5399 } while (exception.retry); 5400 return err; 5401 } 5402 5403 static int _nfs4_do_set_security_label(struct inode *inode, 5404 struct nfs4_label *ilabel, 5405 struct nfs_fattr *fattr, 5406 struct nfs4_label *olabel) 5407 { 5408 5409 struct iattr sattr = {0}; 5410 struct nfs_server *server = NFS_SERVER(inode); 5411 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 5412 struct nfs_setattrargs arg = { 5413 .fh = NFS_FH(inode), 5414 .iap = &sattr, 5415 .server = server, 5416 .bitmask = bitmask, 5417 .label = ilabel, 5418 }; 5419 struct nfs_setattrres res = { 5420 .fattr = fattr, 5421 .label = olabel, 5422 .server = server, 5423 }; 5424 struct rpc_message msg = { 5425 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 5426 .rpc_argp = &arg, 5427 .rpc_resp = &res, 5428 }; 5429 int status; 5430 5431 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 5432 5433 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5434 if (status) 5435 dprintk("%s failed: %d\n", __func__, status); 5436 5437 return status; 5438 } 5439 5440 static int nfs4_do_set_security_label(struct inode *inode, 5441 struct nfs4_label *ilabel, 5442 struct nfs_fattr *fattr, 5443 struct nfs4_label *olabel) 5444 { 5445 struct nfs4_exception exception = { }; 5446 int err; 5447 5448 do { 5449 err = _nfs4_do_set_security_label(inode, ilabel, 5450 fattr, olabel); 5451 trace_nfs4_set_security_label(inode, err); 5452 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5453 &exception); 5454 } while (exception.retry); 5455 return err; 5456 } 5457 5458 static int 5459 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 5460 { 5461 struct nfs4_label ilabel, *olabel = NULL; 5462 struct nfs_fattr fattr; 5463 struct rpc_cred *cred; 5464 int status; 5465 5466 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5467 return -EOPNOTSUPP; 5468 5469 nfs_fattr_init(&fattr); 5470 5471 ilabel.pi = 0; 5472 ilabel.lfs = 0; 5473 ilabel.label = (char *)buf; 5474 ilabel.len = buflen; 5475 5476 cred = rpc_lookup_cred(); 5477 if (IS_ERR(cred)) 5478 return PTR_ERR(cred); 5479 5480 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5481 if (IS_ERR(olabel)) { 5482 status = -PTR_ERR(olabel); 5483 goto out; 5484 } 5485 5486 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5487 if (status == 0) 5488 nfs_setsecurity(inode, &fattr, olabel); 5489 5490 nfs4_label_free(olabel); 5491 out: 5492 put_rpccred(cred); 5493 return status; 5494 } 5495 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5496 5497 5498 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5499 nfs4_verifier *bootverf) 5500 { 5501 __be32 verf[2]; 5502 5503 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5504 /* An impossible timestamp guarantees this value 5505 * will never match a generated boot time. */ 5506 verf[0] = cpu_to_be32(U32_MAX); 5507 verf[1] = cpu_to_be32(U32_MAX); 5508 } else { 5509 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5510 u64 ns = ktime_to_ns(nn->boot_time); 5511 5512 verf[0] = cpu_to_be32(ns >> 32); 5513 verf[1] = cpu_to_be32(ns); 5514 } 5515 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 5516 } 5517 5518 static int 5519 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 5520 { 5521 size_t len; 5522 char *str; 5523 5524 if (clp->cl_owner_id != NULL) 5525 return 0; 5526 5527 rcu_read_lock(); 5528 len = 14 + strlen(clp->cl_ipaddr) + 1 + 5529 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 5530 1 + 5531 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) + 5532 1; 5533 rcu_read_unlock(); 5534 5535 if (len > NFS4_OPAQUE_LIMIT + 1) 5536 return -EINVAL; 5537 5538 /* 5539 * Since this string is allocated at mount time, and held until the 5540 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5541 * about a memory-reclaim deadlock. 5542 */ 5543 str = kmalloc(len, GFP_KERNEL); 5544 if (!str) 5545 return -ENOMEM; 5546 5547 rcu_read_lock(); 5548 scnprintf(str, len, "Linux NFSv4.0 %s/%s %s", 5549 clp->cl_ipaddr, 5550 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), 5551 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)); 5552 rcu_read_unlock(); 5553 5554 clp->cl_owner_id = str; 5555 return 0; 5556 } 5557 5558 static int 5559 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 5560 { 5561 size_t len; 5562 char *str; 5563 5564 len = 10 + 10 + 1 + 10 + 1 + 5565 strlen(nfs4_client_id_uniquifier) + 1 + 5566 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5567 5568 if (len > NFS4_OPAQUE_LIMIT + 1) 5569 return -EINVAL; 5570 5571 /* 5572 * Since this string is allocated at mount time, and held until the 5573 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5574 * about a memory-reclaim deadlock. 5575 */ 5576 str = kmalloc(len, GFP_KERNEL); 5577 if (!str) 5578 return -ENOMEM; 5579 5580 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 5581 clp->rpc_ops->version, clp->cl_minorversion, 5582 nfs4_client_id_uniquifier, 5583 clp->cl_rpcclient->cl_nodename); 5584 clp->cl_owner_id = str; 5585 return 0; 5586 } 5587 5588 static int 5589 nfs4_init_uniform_client_string(struct nfs_client *clp) 5590 { 5591 size_t len; 5592 char *str; 5593 5594 if (clp->cl_owner_id != NULL) 5595 return 0; 5596 5597 if (nfs4_client_id_uniquifier[0] != '\0') 5598 return nfs4_init_uniquifier_client_string(clp); 5599 5600 len = 10 + 10 + 1 + 10 + 1 + 5601 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5602 5603 if (len > NFS4_OPAQUE_LIMIT + 1) 5604 return -EINVAL; 5605 5606 /* 5607 * Since this string is allocated at mount time, and held until the 5608 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5609 * about a memory-reclaim deadlock. 5610 */ 5611 str = kmalloc(len, GFP_KERNEL); 5612 if (!str) 5613 return -ENOMEM; 5614 5615 scnprintf(str, len, "Linux NFSv%u.%u %s", 5616 clp->rpc_ops->version, clp->cl_minorversion, 5617 clp->cl_rpcclient->cl_nodename); 5618 clp->cl_owner_id = str; 5619 return 0; 5620 } 5621 5622 /* 5623 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 5624 * services. Advertise one based on the address family of the 5625 * clientaddr. 5626 */ 5627 static unsigned int 5628 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 5629 { 5630 if (strchr(clp->cl_ipaddr, ':') != NULL) 5631 return scnprintf(buf, len, "tcp6"); 5632 else 5633 return scnprintf(buf, len, "tcp"); 5634 } 5635 5636 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 5637 { 5638 struct nfs4_setclientid *sc = calldata; 5639 5640 if (task->tk_status == 0) 5641 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 5642 } 5643 5644 static const struct rpc_call_ops nfs4_setclientid_ops = { 5645 .rpc_call_done = nfs4_setclientid_done, 5646 }; 5647 5648 /** 5649 * nfs4_proc_setclientid - Negotiate client ID 5650 * @clp: state data structure 5651 * @program: RPC program for NFSv4 callback service 5652 * @port: IP port number for NFS4 callback service 5653 * @cred: RPC credential to use for this call 5654 * @res: where to place the result 5655 * 5656 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5657 */ 5658 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 5659 unsigned short port, struct rpc_cred *cred, 5660 struct nfs4_setclientid_res *res) 5661 { 5662 nfs4_verifier sc_verifier; 5663 struct nfs4_setclientid setclientid = { 5664 .sc_verifier = &sc_verifier, 5665 .sc_prog = program, 5666 .sc_clnt = clp, 5667 }; 5668 struct rpc_message msg = { 5669 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5670 .rpc_argp = &setclientid, 5671 .rpc_resp = res, 5672 .rpc_cred = cred, 5673 }; 5674 struct rpc_task *task; 5675 struct rpc_task_setup task_setup_data = { 5676 .rpc_client = clp->cl_rpcclient, 5677 .rpc_message = &msg, 5678 .callback_ops = &nfs4_setclientid_ops, 5679 .callback_data = &setclientid, 5680 .flags = RPC_TASK_TIMEOUT, 5681 }; 5682 int status; 5683 5684 /* nfs_client_id4 */ 5685 nfs4_init_boot_verifier(clp, &sc_verifier); 5686 5687 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5688 status = nfs4_init_uniform_client_string(clp); 5689 else 5690 status = nfs4_init_nonuniform_client_string(clp); 5691 5692 if (status) 5693 goto out; 5694 5695 /* cb_client4 */ 5696 setclientid.sc_netid_len = 5697 nfs4_init_callback_netid(clp, 5698 setclientid.sc_netid, 5699 sizeof(setclientid.sc_netid)); 5700 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5701 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5702 clp->cl_ipaddr, port >> 8, port & 255); 5703 5704 dprintk("NFS call setclientid auth=%s, '%s'\n", 5705 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5706 clp->cl_owner_id); 5707 task = rpc_run_task(&task_setup_data); 5708 if (IS_ERR(task)) { 5709 status = PTR_ERR(task); 5710 goto out; 5711 } 5712 status = task->tk_status; 5713 if (setclientid.sc_cred) { 5714 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5715 put_rpccred(setclientid.sc_cred); 5716 } 5717 rpc_put_task(task); 5718 out: 5719 trace_nfs4_setclientid(clp, status); 5720 dprintk("NFS reply setclientid: %d\n", status); 5721 return status; 5722 } 5723 5724 /** 5725 * nfs4_proc_setclientid_confirm - Confirm client ID 5726 * @clp: state data structure 5727 * @res: result of a previous SETCLIENTID 5728 * @cred: RPC credential to use for this call 5729 * 5730 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5731 */ 5732 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5733 struct nfs4_setclientid_res *arg, 5734 struct rpc_cred *cred) 5735 { 5736 struct rpc_message msg = { 5737 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5738 .rpc_argp = arg, 5739 .rpc_cred = cred, 5740 }; 5741 int status; 5742 5743 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5744 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5745 clp->cl_clientid); 5746 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5747 trace_nfs4_setclientid_confirm(clp, status); 5748 dprintk("NFS reply setclientid_confirm: %d\n", status); 5749 return status; 5750 } 5751 5752 struct nfs4_delegreturndata { 5753 struct nfs4_delegreturnargs args; 5754 struct nfs4_delegreturnres res; 5755 struct nfs_fh fh; 5756 nfs4_stateid stateid; 5757 unsigned long timestamp; 5758 struct { 5759 struct nfs4_layoutreturn_args arg; 5760 struct nfs4_layoutreturn_res res; 5761 struct nfs4_xdr_opaque_data ld_private; 5762 u32 roc_barrier; 5763 bool roc; 5764 } lr; 5765 struct nfs_fattr fattr; 5766 int rpc_status; 5767 struct inode *inode; 5768 }; 5769 5770 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5771 { 5772 struct nfs4_delegreturndata *data = calldata; 5773 struct nfs4_exception exception = { 5774 .inode = data->inode, 5775 .stateid = &data->stateid, 5776 }; 5777 5778 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5779 return; 5780 5781 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5782 5783 /* Handle Layoutreturn errors */ 5784 if (data->args.lr_args && task->tk_status != 0) { 5785 switch(data->res.lr_ret) { 5786 default: 5787 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5788 break; 5789 case 0: 5790 data->args.lr_args = NULL; 5791 data->res.lr_res = NULL; 5792 break; 5793 case -NFS4ERR_OLD_STATEID: 5794 if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid, 5795 data->inode)) 5796 goto lr_restart; 5797 /* Fallthrough */ 5798 case -NFS4ERR_ADMIN_REVOKED: 5799 case -NFS4ERR_DELEG_REVOKED: 5800 case -NFS4ERR_EXPIRED: 5801 case -NFS4ERR_BAD_STATEID: 5802 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 5803 case -NFS4ERR_WRONG_CRED: 5804 data->args.lr_args = NULL; 5805 data->res.lr_res = NULL; 5806 goto lr_restart; 5807 } 5808 } 5809 5810 switch (task->tk_status) { 5811 case 0: 5812 renew_lease(data->res.server, data->timestamp); 5813 break; 5814 case -NFS4ERR_ADMIN_REVOKED: 5815 case -NFS4ERR_DELEG_REVOKED: 5816 case -NFS4ERR_EXPIRED: 5817 nfs4_free_revoked_stateid(data->res.server, 5818 data->args.stateid, 5819 task->tk_msg.rpc_cred); 5820 /* Fallthrough */ 5821 case -NFS4ERR_BAD_STATEID: 5822 case -NFS4ERR_STALE_STATEID: 5823 task->tk_status = 0; 5824 break; 5825 case -NFS4ERR_OLD_STATEID: 5826 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 5827 goto out_restart; 5828 task->tk_status = 0; 5829 break; 5830 case -NFS4ERR_ACCESS: 5831 if (data->args.bitmask) { 5832 data->args.bitmask = NULL; 5833 data->res.fattr = NULL; 5834 goto out_restart; 5835 } 5836 /* Fallthrough */ 5837 default: 5838 task->tk_status = nfs4_async_handle_exception(task, 5839 data->res.server, task->tk_status, 5840 &exception); 5841 if (exception.retry) 5842 goto out_restart; 5843 } 5844 data->rpc_status = task->tk_status; 5845 return; 5846 lr_restart: 5847 data->res.lr_ret = 0; 5848 out_restart: 5849 task->tk_status = 0; 5850 rpc_restart_call_prepare(task); 5851 } 5852 5853 static void nfs4_delegreturn_release(void *calldata) 5854 { 5855 struct nfs4_delegreturndata *data = calldata; 5856 struct inode *inode = data->inode; 5857 5858 if (inode) { 5859 if (data->lr.roc) 5860 pnfs_roc_release(&data->lr.arg, &data->lr.res, 5861 data->res.lr_ret); 5862 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5863 nfs_iput_and_deactive(inode); 5864 } 5865 kfree(calldata); 5866 } 5867 5868 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5869 { 5870 struct nfs4_delegreturndata *d_data; 5871 5872 d_data = (struct nfs4_delegreturndata *)data; 5873 5874 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) 5875 return; 5876 5877 nfs4_setup_sequence(d_data->res.server->nfs_client, 5878 &d_data->args.seq_args, 5879 &d_data->res.seq_res, 5880 task); 5881 } 5882 5883 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5884 .rpc_call_prepare = nfs4_delegreturn_prepare, 5885 .rpc_call_done = nfs4_delegreturn_done, 5886 .rpc_release = nfs4_delegreturn_release, 5887 }; 5888 5889 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5890 { 5891 struct nfs4_delegreturndata *data; 5892 struct nfs_server *server = NFS_SERVER(inode); 5893 struct rpc_task *task; 5894 struct rpc_message msg = { 5895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5896 .rpc_cred = cred, 5897 }; 5898 struct rpc_task_setup task_setup_data = { 5899 .rpc_client = server->client, 5900 .rpc_message = &msg, 5901 .callback_ops = &nfs4_delegreturn_ops, 5902 .flags = RPC_TASK_ASYNC, 5903 }; 5904 int status = 0; 5905 5906 data = kzalloc(sizeof(*data), GFP_NOFS); 5907 if (data == NULL) 5908 return -ENOMEM; 5909 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5910 5911 nfs4_state_protect(server->nfs_client, 5912 NFS_SP4_MACH_CRED_CLEANUP, 5913 &task_setup_data.rpc_client, &msg); 5914 5915 data->args.fhandle = &data->fh; 5916 data->args.stateid = &data->stateid; 5917 data->args.bitmask = server->cache_consistency_bitmask; 5918 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5919 nfs4_stateid_copy(&data->stateid, stateid); 5920 data->res.fattr = &data->fattr; 5921 data->res.server = server; 5922 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 5923 data->lr.arg.ld_private = &data->lr.ld_private; 5924 nfs_fattr_init(data->res.fattr); 5925 data->timestamp = jiffies; 5926 data->rpc_status = 0; 5927 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred); 5928 data->inode = nfs_igrab_and_active(inode); 5929 if (data->inode) { 5930 if (data->lr.roc) { 5931 data->args.lr_args = &data->lr.arg; 5932 data->res.lr_res = &data->lr.res; 5933 } 5934 } else if (data->lr.roc) { 5935 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0); 5936 data->lr.roc = false; 5937 } 5938 5939 task_setup_data.callback_data = data; 5940 msg.rpc_argp = &data->args; 5941 msg.rpc_resp = &data->res; 5942 task = rpc_run_task(&task_setup_data); 5943 if (IS_ERR(task)) 5944 return PTR_ERR(task); 5945 if (!issync) 5946 goto out; 5947 status = rpc_wait_for_completion_task(task); 5948 if (status != 0) 5949 goto out; 5950 status = data->rpc_status; 5951 out: 5952 rpc_put_task(task); 5953 return status; 5954 } 5955 5956 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5957 { 5958 struct nfs_server *server = NFS_SERVER(inode); 5959 struct nfs4_exception exception = { }; 5960 int err; 5961 do { 5962 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5963 trace_nfs4_delegreturn(inode, stateid, err); 5964 switch (err) { 5965 case -NFS4ERR_STALE_STATEID: 5966 case -NFS4ERR_EXPIRED: 5967 case 0: 5968 return 0; 5969 } 5970 err = nfs4_handle_exception(server, err, &exception); 5971 } while (exception.retry); 5972 return err; 5973 } 5974 5975 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5976 { 5977 struct inode *inode = state->inode; 5978 struct nfs_server *server = NFS_SERVER(inode); 5979 struct nfs_client *clp = server->nfs_client; 5980 struct nfs_lockt_args arg = { 5981 .fh = NFS_FH(inode), 5982 .fl = request, 5983 }; 5984 struct nfs_lockt_res res = { 5985 .denied = request, 5986 }; 5987 struct rpc_message msg = { 5988 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5989 .rpc_argp = &arg, 5990 .rpc_resp = &res, 5991 .rpc_cred = state->owner->so_cred, 5992 }; 5993 struct nfs4_lock_state *lsp; 5994 int status; 5995 5996 arg.lock_owner.clientid = clp->cl_clientid; 5997 status = nfs4_set_lock_state(state, request); 5998 if (status != 0) 5999 goto out; 6000 lsp = request->fl_u.nfs4_fl.owner; 6001 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6002 arg.lock_owner.s_dev = server->s_dev; 6003 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6004 switch (status) { 6005 case 0: 6006 request->fl_type = F_UNLCK; 6007 break; 6008 case -NFS4ERR_DENIED: 6009 status = 0; 6010 } 6011 request->fl_ops->fl_release_private(request); 6012 request->fl_ops = NULL; 6013 out: 6014 return status; 6015 } 6016 6017 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6018 { 6019 struct nfs4_exception exception = { }; 6020 int err; 6021 6022 do { 6023 err = _nfs4_proc_getlk(state, cmd, request); 6024 trace_nfs4_get_lock(request, state, cmd, err); 6025 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6026 &exception); 6027 } while (exception.retry); 6028 return err; 6029 } 6030 6031 struct nfs4_unlockdata { 6032 struct nfs_locku_args arg; 6033 struct nfs_locku_res res; 6034 struct nfs4_lock_state *lsp; 6035 struct nfs_open_context *ctx; 6036 struct nfs_lock_context *l_ctx; 6037 struct file_lock fl; 6038 struct nfs_server *server; 6039 unsigned long timestamp; 6040 }; 6041 6042 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6043 struct nfs_open_context *ctx, 6044 struct nfs4_lock_state *lsp, 6045 struct nfs_seqid *seqid) 6046 { 6047 struct nfs4_unlockdata *p; 6048 struct inode *inode = lsp->ls_state->inode; 6049 6050 p = kzalloc(sizeof(*p), GFP_NOFS); 6051 if (p == NULL) 6052 return NULL; 6053 p->arg.fh = NFS_FH(inode); 6054 p->arg.fl = &p->fl; 6055 p->arg.seqid = seqid; 6056 p->res.seqid = seqid; 6057 p->lsp = lsp; 6058 refcount_inc(&lsp->ls_count); 6059 /* Ensure we don't close file until we're done freeing locks! */ 6060 p->ctx = get_nfs_open_context(ctx); 6061 p->l_ctx = nfs_get_lock_context(ctx); 6062 memcpy(&p->fl, fl, sizeof(p->fl)); 6063 p->server = NFS_SERVER(inode); 6064 return p; 6065 } 6066 6067 static void nfs4_locku_release_calldata(void *data) 6068 { 6069 struct nfs4_unlockdata *calldata = data; 6070 nfs_free_seqid(calldata->arg.seqid); 6071 nfs4_put_lock_state(calldata->lsp); 6072 nfs_put_lock_context(calldata->l_ctx); 6073 put_nfs_open_context(calldata->ctx); 6074 kfree(calldata); 6075 } 6076 6077 static void nfs4_locku_done(struct rpc_task *task, void *data) 6078 { 6079 struct nfs4_unlockdata *calldata = data; 6080 struct nfs4_exception exception = { 6081 .inode = calldata->lsp->ls_state->inode, 6082 .stateid = &calldata->arg.stateid, 6083 }; 6084 6085 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6086 return; 6087 switch (task->tk_status) { 6088 case 0: 6089 renew_lease(calldata->server, calldata->timestamp); 6090 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6091 if (nfs4_update_lock_stateid(calldata->lsp, 6092 &calldata->res.stateid)) 6093 break; 6094 case -NFS4ERR_ADMIN_REVOKED: 6095 case -NFS4ERR_EXPIRED: 6096 nfs4_free_revoked_stateid(calldata->server, 6097 &calldata->arg.stateid, 6098 task->tk_msg.rpc_cred); 6099 case -NFS4ERR_BAD_STATEID: 6100 case -NFS4ERR_OLD_STATEID: 6101 case -NFS4ERR_STALE_STATEID: 6102 if (!nfs4_stateid_match(&calldata->arg.stateid, 6103 &calldata->lsp->ls_stateid)) 6104 rpc_restart_call_prepare(task); 6105 break; 6106 default: 6107 task->tk_status = nfs4_async_handle_exception(task, 6108 calldata->server, task->tk_status, 6109 &exception); 6110 if (exception.retry) 6111 rpc_restart_call_prepare(task); 6112 } 6113 nfs_release_seqid(calldata->arg.seqid); 6114 } 6115 6116 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6117 { 6118 struct nfs4_unlockdata *calldata = data; 6119 6120 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6121 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6122 return; 6123 6124 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6125 goto out_wait; 6126 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid); 6127 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6128 /* Note: exit _without_ running nfs4_locku_done */ 6129 goto out_no_action; 6130 } 6131 calldata->timestamp = jiffies; 6132 if (nfs4_setup_sequence(calldata->server->nfs_client, 6133 &calldata->arg.seq_args, 6134 &calldata->res.seq_res, 6135 task) != 0) 6136 nfs_release_seqid(calldata->arg.seqid); 6137 return; 6138 out_no_action: 6139 task->tk_action = NULL; 6140 out_wait: 6141 nfs4_sequence_done(task, &calldata->res.seq_res); 6142 } 6143 6144 static const struct rpc_call_ops nfs4_locku_ops = { 6145 .rpc_call_prepare = nfs4_locku_prepare, 6146 .rpc_call_done = nfs4_locku_done, 6147 .rpc_release = nfs4_locku_release_calldata, 6148 }; 6149 6150 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6151 struct nfs_open_context *ctx, 6152 struct nfs4_lock_state *lsp, 6153 struct nfs_seqid *seqid) 6154 { 6155 struct nfs4_unlockdata *data; 6156 struct rpc_message msg = { 6157 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6158 .rpc_cred = ctx->cred, 6159 }; 6160 struct rpc_task_setup task_setup_data = { 6161 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6162 .rpc_message = &msg, 6163 .callback_ops = &nfs4_locku_ops, 6164 .workqueue = nfsiod_workqueue, 6165 .flags = RPC_TASK_ASYNC, 6166 }; 6167 6168 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6169 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6170 6171 /* Ensure this is an unlock - when canceling a lock, the 6172 * canceled lock is passed in, and it won't be an unlock. 6173 */ 6174 fl->fl_type = F_UNLCK; 6175 if (fl->fl_flags & FL_CLOSE) 6176 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6177 6178 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 6179 if (data == NULL) { 6180 nfs_free_seqid(seqid); 6181 return ERR_PTR(-ENOMEM); 6182 } 6183 6184 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 6185 msg.rpc_argp = &data->arg; 6186 msg.rpc_resp = &data->res; 6187 task_setup_data.callback_data = data; 6188 return rpc_run_task(&task_setup_data); 6189 } 6190 6191 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 6192 { 6193 struct inode *inode = state->inode; 6194 struct nfs4_state_owner *sp = state->owner; 6195 struct nfs_inode *nfsi = NFS_I(inode); 6196 struct nfs_seqid *seqid; 6197 struct nfs4_lock_state *lsp; 6198 struct rpc_task *task; 6199 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6200 int status = 0; 6201 unsigned char fl_flags = request->fl_flags; 6202 6203 status = nfs4_set_lock_state(state, request); 6204 /* Unlock _before_ we do the RPC call */ 6205 request->fl_flags |= FL_EXISTS; 6206 /* Exclude nfs_delegation_claim_locks() */ 6207 mutex_lock(&sp->so_delegreturn_mutex); 6208 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 6209 down_read(&nfsi->rwsem); 6210 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 6211 up_read(&nfsi->rwsem); 6212 mutex_unlock(&sp->so_delegreturn_mutex); 6213 goto out; 6214 } 6215 up_read(&nfsi->rwsem); 6216 mutex_unlock(&sp->so_delegreturn_mutex); 6217 if (status != 0) 6218 goto out; 6219 /* Is this a delegated lock? */ 6220 lsp = request->fl_u.nfs4_fl.owner; 6221 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 6222 goto out; 6223 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 6224 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 6225 status = -ENOMEM; 6226 if (IS_ERR(seqid)) 6227 goto out; 6228 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 6229 status = PTR_ERR(task); 6230 if (IS_ERR(task)) 6231 goto out; 6232 status = rpc_wait_for_completion_task(task); 6233 rpc_put_task(task); 6234 out: 6235 request->fl_flags = fl_flags; 6236 trace_nfs4_unlock(request, state, F_SETLK, status); 6237 return status; 6238 } 6239 6240 struct nfs4_lockdata { 6241 struct nfs_lock_args arg; 6242 struct nfs_lock_res res; 6243 struct nfs4_lock_state *lsp; 6244 struct nfs_open_context *ctx; 6245 struct file_lock fl; 6246 unsigned long timestamp; 6247 int rpc_status; 6248 int cancelled; 6249 struct nfs_server *server; 6250 }; 6251 6252 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 6253 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 6254 gfp_t gfp_mask) 6255 { 6256 struct nfs4_lockdata *p; 6257 struct inode *inode = lsp->ls_state->inode; 6258 struct nfs_server *server = NFS_SERVER(inode); 6259 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 6260 6261 p = kzalloc(sizeof(*p), gfp_mask); 6262 if (p == NULL) 6263 return NULL; 6264 6265 p->arg.fh = NFS_FH(inode); 6266 p->arg.fl = &p->fl; 6267 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 6268 if (IS_ERR(p->arg.open_seqid)) 6269 goto out_free; 6270 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 6271 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 6272 if (IS_ERR(p->arg.lock_seqid)) 6273 goto out_free_seqid; 6274 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 6275 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 6276 p->arg.lock_owner.s_dev = server->s_dev; 6277 p->res.lock_seqid = p->arg.lock_seqid; 6278 p->lsp = lsp; 6279 p->server = server; 6280 refcount_inc(&lsp->ls_count); 6281 p->ctx = get_nfs_open_context(ctx); 6282 memcpy(&p->fl, fl, sizeof(p->fl)); 6283 return p; 6284 out_free_seqid: 6285 nfs_free_seqid(p->arg.open_seqid); 6286 out_free: 6287 kfree(p); 6288 return NULL; 6289 } 6290 6291 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 6292 { 6293 struct nfs4_lockdata *data = calldata; 6294 struct nfs4_state *state = data->lsp->ls_state; 6295 6296 dprintk("%s: begin!\n", __func__); 6297 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 6298 goto out_wait; 6299 /* Do we need to do an open_to_lock_owner? */ 6300 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 6301 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 6302 goto out_release_lock_seqid; 6303 } 6304 nfs4_stateid_copy(&data->arg.open_stateid, 6305 &state->open_stateid); 6306 data->arg.new_lock_owner = 1; 6307 data->res.open_seqid = data->arg.open_seqid; 6308 } else { 6309 data->arg.new_lock_owner = 0; 6310 nfs4_stateid_copy(&data->arg.lock_stateid, 6311 &data->lsp->ls_stateid); 6312 } 6313 if (!nfs4_valid_open_stateid(state)) { 6314 data->rpc_status = -EBADF; 6315 task->tk_action = NULL; 6316 goto out_release_open_seqid; 6317 } 6318 data->timestamp = jiffies; 6319 if (nfs4_setup_sequence(data->server->nfs_client, 6320 &data->arg.seq_args, 6321 &data->res.seq_res, 6322 task) == 0) 6323 return; 6324 out_release_open_seqid: 6325 nfs_release_seqid(data->arg.open_seqid); 6326 out_release_lock_seqid: 6327 nfs_release_seqid(data->arg.lock_seqid); 6328 out_wait: 6329 nfs4_sequence_done(task, &data->res.seq_res); 6330 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 6331 } 6332 6333 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 6334 { 6335 struct nfs4_lockdata *data = calldata; 6336 struct nfs4_lock_state *lsp = data->lsp; 6337 6338 dprintk("%s: begin!\n", __func__); 6339 6340 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6341 return; 6342 6343 data->rpc_status = task->tk_status; 6344 switch (task->tk_status) { 6345 case 0: 6346 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 6347 data->timestamp); 6348 if (data->arg.new_lock) { 6349 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 6350 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) { 6351 rpc_restart_call_prepare(task); 6352 break; 6353 } 6354 } 6355 if (data->arg.new_lock_owner != 0) { 6356 nfs_confirm_seqid(&lsp->ls_seqid, 0); 6357 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 6358 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6359 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 6360 rpc_restart_call_prepare(task); 6361 break; 6362 case -NFS4ERR_BAD_STATEID: 6363 case -NFS4ERR_OLD_STATEID: 6364 case -NFS4ERR_STALE_STATEID: 6365 case -NFS4ERR_EXPIRED: 6366 if (data->arg.new_lock_owner != 0) { 6367 if (!nfs4_stateid_match(&data->arg.open_stateid, 6368 &lsp->ls_state->open_stateid)) 6369 rpc_restart_call_prepare(task); 6370 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 6371 &lsp->ls_stateid)) 6372 rpc_restart_call_prepare(task); 6373 } 6374 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 6375 } 6376 6377 static void nfs4_lock_release(void *calldata) 6378 { 6379 struct nfs4_lockdata *data = calldata; 6380 6381 dprintk("%s: begin!\n", __func__); 6382 nfs_free_seqid(data->arg.open_seqid); 6383 if (data->cancelled) { 6384 struct rpc_task *task; 6385 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 6386 data->arg.lock_seqid); 6387 if (!IS_ERR(task)) 6388 rpc_put_task_async(task); 6389 dprintk("%s: cancelling lock!\n", __func__); 6390 } else 6391 nfs_free_seqid(data->arg.lock_seqid); 6392 nfs4_put_lock_state(data->lsp); 6393 put_nfs_open_context(data->ctx); 6394 kfree(data); 6395 dprintk("%s: done!\n", __func__); 6396 } 6397 6398 static const struct rpc_call_ops nfs4_lock_ops = { 6399 .rpc_call_prepare = nfs4_lock_prepare, 6400 .rpc_call_done = nfs4_lock_done, 6401 .rpc_release = nfs4_lock_release, 6402 }; 6403 6404 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 6405 { 6406 switch (error) { 6407 case -NFS4ERR_ADMIN_REVOKED: 6408 case -NFS4ERR_EXPIRED: 6409 case -NFS4ERR_BAD_STATEID: 6410 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6411 if (new_lock_owner != 0 || 6412 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 6413 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 6414 break; 6415 case -NFS4ERR_STALE_STATEID: 6416 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 6417 nfs4_schedule_lease_recovery(server->nfs_client); 6418 }; 6419 } 6420 6421 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 6422 { 6423 struct nfs4_lockdata *data; 6424 struct rpc_task *task; 6425 struct rpc_message msg = { 6426 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 6427 .rpc_cred = state->owner->so_cred, 6428 }; 6429 struct rpc_task_setup task_setup_data = { 6430 .rpc_client = NFS_CLIENT(state->inode), 6431 .rpc_message = &msg, 6432 .callback_ops = &nfs4_lock_ops, 6433 .workqueue = nfsiod_workqueue, 6434 .flags = RPC_TASK_ASYNC, 6435 }; 6436 int ret; 6437 6438 dprintk("%s: begin!\n", __func__); 6439 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 6440 fl->fl_u.nfs4_fl.owner, 6441 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 6442 if (data == NULL) 6443 return -ENOMEM; 6444 if (IS_SETLKW(cmd)) 6445 data->arg.block = 1; 6446 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 6447 msg.rpc_argp = &data->arg; 6448 msg.rpc_resp = &data->res; 6449 task_setup_data.callback_data = data; 6450 if (recovery_type > NFS_LOCK_NEW) { 6451 if (recovery_type == NFS_LOCK_RECLAIM) 6452 data->arg.reclaim = NFS_LOCK_RECLAIM; 6453 nfs4_set_sequence_privileged(&data->arg.seq_args); 6454 } else 6455 data->arg.new_lock = 1; 6456 task = rpc_run_task(&task_setup_data); 6457 if (IS_ERR(task)) 6458 return PTR_ERR(task); 6459 ret = rpc_wait_for_completion_task(task); 6460 if (ret == 0) { 6461 ret = data->rpc_status; 6462 if (ret) 6463 nfs4_handle_setlk_error(data->server, data->lsp, 6464 data->arg.new_lock_owner, ret); 6465 } else 6466 data->cancelled = true; 6467 rpc_put_task(task); 6468 dprintk("%s: done, ret = %d!\n", __func__, ret); 6469 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 6470 return ret; 6471 } 6472 6473 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 6474 { 6475 struct nfs_server *server = NFS_SERVER(state->inode); 6476 struct nfs4_exception exception = { 6477 .inode = state->inode, 6478 }; 6479 int err; 6480 6481 do { 6482 /* Cache the lock if possible... */ 6483 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6484 return 0; 6485 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 6486 if (err != -NFS4ERR_DELAY) 6487 break; 6488 nfs4_handle_exception(server, err, &exception); 6489 } while (exception.retry); 6490 return err; 6491 } 6492 6493 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 6494 { 6495 struct nfs_server *server = NFS_SERVER(state->inode); 6496 struct nfs4_exception exception = { 6497 .inode = state->inode, 6498 }; 6499 int err; 6500 6501 err = nfs4_set_lock_state(state, request); 6502 if (err != 0) 6503 return err; 6504 if (!recover_lost_locks) { 6505 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 6506 return 0; 6507 } 6508 do { 6509 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6510 return 0; 6511 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 6512 switch (err) { 6513 default: 6514 goto out; 6515 case -NFS4ERR_GRACE: 6516 case -NFS4ERR_DELAY: 6517 nfs4_handle_exception(server, err, &exception); 6518 err = 0; 6519 } 6520 } while (exception.retry); 6521 out: 6522 return err; 6523 } 6524 6525 #if defined(CONFIG_NFS_V4_1) 6526 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 6527 { 6528 struct nfs4_lock_state *lsp; 6529 int status; 6530 6531 status = nfs4_set_lock_state(state, request); 6532 if (status != 0) 6533 return status; 6534 lsp = request->fl_u.nfs4_fl.owner; 6535 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 6536 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 6537 return 0; 6538 return nfs4_lock_expired(state, request); 6539 } 6540 #endif 6541 6542 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6543 { 6544 struct nfs_inode *nfsi = NFS_I(state->inode); 6545 struct nfs4_state_owner *sp = state->owner; 6546 unsigned char fl_flags = request->fl_flags; 6547 int status; 6548 6549 request->fl_flags |= FL_ACCESS; 6550 status = locks_lock_inode_wait(state->inode, request); 6551 if (status < 0) 6552 goto out; 6553 mutex_lock(&sp->so_delegreturn_mutex); 6554 down_read(&nfsi->rwsem); 6555 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 6556 /* Yes: cache locks! */ 6557 /* ...but avoid races with delegation recall... */ 6558 request->fl_flags = fl_flags & ~FL_SLEEP; 6559 status = locks_lock_inode_wait(state->inode, request); 6560 up_read(&nfsi->rwsem); 6561 mutex_unlock(&sp->so_delegreturn_mutex); 6562 goto out; 6563 } 6564 up_read(&nfsi->rwsem); 6565 mutex_unlock(&sp->so_delegreturn_mutex); 6566 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 6567 out: 6568 request->fl_flags = fl_flags; 6569 return status; 6570 } 6571 6572 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6573 { 6574 struct nfs4_exception exception = { 6575 .state = state, 6576 .inode = state->inode, 6577 }; 6578 int err; 6579 6580 do { 6581 err = _nfs4_proc_setlk(state, cmd, request); 6582 if (err == -NFS4ERR_DENIED) 6583 err = -EAGAIN; 6584 err = nfs4_handle_exception(NFS_SERVER(state->inode), 6585 err, &exception); 6586 } while (exception.retry); 6587 return err; 6588 } 6589 6590 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 6591 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 6592 6593 static int 6594 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 6595 struct file_lock *request) 6596 { 6597 int status = -ERESTARTSYS; 6598 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 6599 6600 while(!signalled()) { 6601 status = nfs4_proc_setlk(state, cmd, request); 6602 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6603 break; 6604 freezable_schedule_timeout_interruptible(timeout); 6605 timeout *= 2; 6606 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 6607 status = -ERESTARTSYS; 6608 } 6609 return status; 6610 } 6611 6612 #ifdef CONFIG_NFS_V4_1 6613 struct nfs4_lock_waiter { 6614 struct task_struct *task; 6615 struct inode *inode; 6616 struct nfs_lowner *owner; 6617 bool notified; 6618 }; 6619 6620 static int 6621 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 6622 { 6623 int ret; 6624 struct cb_notify_lock_args *cbnl = key; 6625 struct nfs4_lock_waiter *waiter = wait->private; 6626 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 6627 *wowner = waiter->owner; 6628 6629 /* Only wake if the callback was for the same owner */ 6630 if (lowner->clientid != wowner->clientid || 6631 lowner->id != wowner->id || 6632 lowner->s_dev != wowner->s_dev) 6633 return 0; 6634 6635 /* Make sure it's for the right inode */ 6636 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 6637 return 0; 6638 6639 waiter->notified = true; 6640 6641 /* override "private" so we can use default_wake_function */ 6642 wait->private = waiter->task; 6643 ret = autoremove_wake_function(wait, mode, flags, key); 6644 wait->private = waiter; 6645 return ret; 6646 } 6647 6648 static int 6649 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6650 { 6651 int status = -ERESTARTSYS; 6652 unsigned long flags; 6653 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 6654 struct nfs_server *server = NFS_SERVER(state->inode); 6655 struct nfs_client *clp = server->nfs_client; 6656 wait_queue_head_t *q = &clp->cl_lock_waitq; 6657 struct nfs_lowner owner = { .clientid = clp->cl_clientid, 6658 .id = lsp->ls_seqid.owner_id, 6659 .s_dev = server->s_dev }; 6660 struct nfs4_lock_waiter waiter = { .task = current, 6661 .inode = state->inode, 6662 .owner = &owner, 6663 .notified = false }; 6664 wait_queue_entry_t wait; 6665 6666 /* Don't bother with waitqueue if we don't expect a callback */ 6667 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 6668 return nfs4_retry_setlk_simple(state, cmd, request); 6669 6670 init_wait(&wait); 6671 wait.private = &waiter; 6672 wait.func = nfs4_wake_lock_waiter; 6673 add_wait_queue(q, &wait); 6674 6675 while(!signalled()) { 6676 status = nfs4_proc_setlk(state, cmd, request); 6677 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6678 break; 6679 6680 status = -ERESTARTSYS; 6681 spin_lock_irqsave(&q->lock, flags); 6682 if (waiter.notified) { 6683 spin_unlock_irqrestore(&q->lock, flags); 6684 continue; 6685 } 6686 set_current_state(TASK_INTERRUPTIBLE); 6687 spin_unlock_irqrestore(&q->lock, flags); 6688 6689 freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT); 6690 } 6691 6692 finish_wait(q, &wait); 6693 return status; 6694 } 6695 #else /* !CONFIG_NFS_V4_1 */ 6696 static inline int 6697 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6698 { 6699 return nfs4_retry_setlk_simple(state, cmd, request); 6700 } 6701 #endif 6702 6703 static int 6704 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 6705 { 6706 struct nfs_open_context *ctx; 6707 struct nfs4_state *state; 6708 int status; 6709 6710 /* verify open state */ 6711 ctx = nfs_file_open_context(filp); 6712 state = ctx->state; 6713 6714 if (IS_GETLK(cmd)) { 6715 if (state != NULL) 6716 return nfs4_proc_getlk(state, F_GETLK, request); 6717 return 0; 6718 } 6719 6720 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 6721 return -EINVAL; 6722 6723 if (request->fl_type == F_UNLCK) { 6724 if (state != NULL) 6725 return nfs4_proc_unlck(state, cmd, request); 6726 return 0; 6727 } 6728 6729 if (state == NULL) 6730 return -ENOLCK; 6731 6732 if ((request->fl_flags & FL_POSIX) && 6733 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 6734 return -ENOLCK; 6735 6736 /* 6737 * Don't rely on the VFS having checked the file open mode, 6738 * since it won't do this for flock() locks. 6739 */ 6740 switch (request->fl_type) { 6741 case F_RDLCK: 6742 if (!(filp->f_mode & FMODE_READ)) 6743 return -EBADF; 6744 break; 6745 case F_WRLCK: 6746 if (!(filp->f_mode & FMODE_WRITE)) 6747 return -EBADF; 6748 } 6749 6750 status = nfs4_set_lock_state(state, request); 6751 if (status != 0) 6752 return status; 6753 6754 return nfs4_retry_setlk(state, cmd, request); 6755 } 6756 6757 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 6758 { 6759 struct nfs_server *server = NFS_SERVER(state->inode); 6760 int err; 6761 6762 err = nfs4_set_lock_state(state, fl); 6763 if (err != 0) 6764 return err; 6765 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 6766 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 6767 } 6768 6769 struct nfs_release_lockowner_data { 6770 struct nfs4_lock_state *lsp; 6771 struct nfs_server *server; 6772 struct nfs_release_lockowner_args args; 6773 struct nfs_release_lockowner_res res; 6774 unsigned long timestamp; 6775 }; 6776 6777 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 6778 { 6779 struct nfs_release_lockowner_data *data = calldata; 6780 struct nfs_server *server = data->server; 6781 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 6782 &data->res.seq_res, task); 6783 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6784 data->timestamp = jiffies; 6785 } 6786 6787 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 6788 { 6789 struct nfs_release_lockowner_data *data = calldata; 6790 struct nfs_server *server = data->server; 6791 6792 nfs40_sequence_done(task, &data->res.seq_res); 6793 6794 switch (task->tk_status) { 6795 case 0: 6796 renew_lease(server, data->timestamp); 6797 break; 6798 case -NFS4ERR_STALE_CLIENTID: 6799 case -NFS4ERR_EXPIRED: 6800 nfs4_schedule_lease_recovery(server->nfs_client); 6801 break; 6802 case -NFS4ERR_LEASE_MOVED: 6803 case -NFS4ERR_DELAY: 6804 if (nfs4_async_handle_error(task, server, 6805 NULL, NULL) == -EAGAIN) 6806 rpc_restart_call_prepare(task); 6807 } 6808 } 6809 6810 static void nfs4_release_lockowner_release(void *calldata) 6811 { 6812 struct nfs_release_lockowner_data *data = calldata; 6813 nfs4_free_lock_state(data->server, data->lsp); 6814 kfree(calldata); 6815 } 6816 6817 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6818 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6819 .rpc_call_done = nfs4_release_lockowner_done, 6820 .rpc_release = nfs4_release_lockowner_release, 6821 }; 6822 6823 static void 6824 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6825 { 6826 struct nfs_release_lockowner_data *data; 6827 struct rpc_message msg = { 6828 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6829 }; 6830 6831 if (server->nfs_client->cl_mvops->minor_version != 0) 6832 return; 6833 6834 data = kmalloc(sizeof(*data), GFP_NOFS); 6835 if (!data) 6836 return; 6837 data->lsp = lsp; 6838 data->server = server; 6839 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6840 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6841 data->args.lock_owner.s_dev = server->s_dev; 6842 6843 msg.rpc_argp = &data->args; 6844 msg.rpc_resp = &data->res; 6845 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 6846 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6847 } 6848 6849 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6850 6851 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 6852 struct dentry *unused, struct inode *inode, 6853 const char *key, const void *buf, 6854 size_t buflen, int flags) 6855 { 6856 return nfs4_proc_set_acl(inode, buf, buflen); 6857 } 6858 6859 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 6860 struct dentry *unused, struct inode *inode, 6861 const char *key, void *buf, size_t buflen) 6862 { 6863 return nfs4_proc_get_acl(inode, buf, buflen); 6864 } 6865 6866 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 6867 { 6868 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 6869 } 6870 6871 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6872 6873 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 6874 struct dentry *unused, struct inode *inode, 6875 const char *key, const void *buf, 6876 size_t buflen, int flags) 6877 { 6878 if (security_ismaclabel(key)) 6879 return nfs4_set_security_label(inode, buf, buflen); 6880 6881 return -EOPNOTSUPP; 6882 } 6883 6884 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 6885 struct dentry *unused, struct inode *inode, 6886 const char *key, void *buf, size_t buflen) 6887 { 6888 if (security_ismaclabel(key)) 6889 return nfs4_get_security_label(inode, buf, buflen); 6890 return -EOPNOTSUPP; 6891 } 6892 6893 static ssize_t 6894 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6895 { 6896 int len = 0; 6897 6898 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 6899 len = security_inode_listsecurity(inode, list, list_len); 6900 if (list_len && len > list_len) 6901 return -ERANGE; 6902 } 6903 return len; 6904 } 6905 6906 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6907 .prefix = XATTR_SECURITY_PREFIX, 6908 .get = nfs4_xattr_get_nfs4_label, 6909 .set = nfs4_xattr_set_nfs4_label, 6910 }; 6911 6912 #else 6913 6914 static ssize_t 6915 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6916 { 6917 return 0; 6918 } 6919 6920 #endif 6921 6922 /* 6923 * nfs_fhget will use either the mounted_on_fileid or the fileid 6924 */ 6925 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6926 { 6927 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6928 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6929 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6930 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6931 return; 6932 6933 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6934 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6935 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6936 fattr->nlink = 2; 6937 } 6938 6939 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6940 const struct qstr *name, 6941 struct nfs4_fs_locations *fs_locations, 6942 struct page *page) 6943 { 6944 struct nfs_server *server = NFS_SERVER(dir); 6945 u32 bitmask[3]; 6946 struct nfs4_fs_locations_arg args = { 6947 .dir_fh = NFS_FH(dir), 6948 .name = name, 6949 .page = page, 6950 .bitmask = bitmask, 6951 }; 6952 struct nfs4_fs_locations_res res = { 6953 .fs_locations = fs_locations, 6954 }; 6955 struct rpc_message msg = { 6956 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6957 .rpc_argp = &args, 6958 .rpc_resp = &res, 6959 }; 6960 int status; 6961 6962 dprintk("%s: start\n", __func__); 6963 6964 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 6965 bitmask[1] = nfs4_fattr_bitmap[1]; 6966 6967 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6968 * is not supported */ 6969 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6970 bitmask[0] &= ~FATTR4_WORD0_FILEID; 6971 else 6972 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 6973 6974 nfs_fattr_init(&fs_locations->fattr); 6975 fs_locations->server = server; 6976 fs_locations->nlocations = 0; 6977 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6978 dprintk("%s: returned status = %d\n", __func__, status); 6979 return status; 6980 } 6981 6982 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6983 const struct qstr *name, 6984 struct nfs4_fs_locations *fs_locations, 6985 struct page *page) 6986 { 6987 struct nfs4_exception exception = { }; 6988 int err; 6989 do { 6990 err = _nfs4_proc_fs_locations(client, dir, name, 6991 fs_locations, page); 6992 trace_nfs4_get_fs_locations(dir, name, err); 6993 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6994 &exception); 6995 } while (exception.retry); 6996 return err; 6997 } 6998 6999 /* 7000 * This operation also signals the server that this client is 7001 * performing migration recovery. The server can stop returning 7002 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 7003 * appended to this compound to identify the client ID which is 7004 * performing recovery. 7005 */ 7006 static int _nfs40_proc_get_locations(struct inode *inode, 7007 struct nfs4_fs_locations *locations, 7008 struct page *page, struct rpc_cred *cred) 7009 { 7010 struct nfs_server *server = NFS_SERVER(inode); 7011 struct rpc_clnt *clnt = server->client; 7012 u32 bitmask[2] = { 7013 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7014 }; 7015 struct nfs4_fs_locations_arg args = { 7016 .clientid = server->nfs_client->cl_clientid, 7017 .fh = NFS_FH(inode), 7018 .page = page, 7019 .bitmask = bitmask, 7020 .migration = 1, /* skip LOOKUP */ 7021 .renew = 1, /* append RENEW */ 7022 }; 7023 struct nfs4_fs_locations_res res = { 7024 .fs_locations = locations, 7025 .migration = 1, 7026 .renew = 1, 7027 }; 7028 struct rpc_message msg = { 7029 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7030 .rpc_argp = &args, 7031 .rpc_resp = &res, 7032 .rpc_cred = cred, 7033 }; 7034 unsigned long now = jiffies; 7035 int status; 7036 7037 nfs_fattr_init(&locations->fattr); 7038 locations->server = server; 7039 locations->nlocations = 0; 7040 7041 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7042 nfs4_set_sequence_privileged(&args.seq_args); 7043 status = nfs4_call_sync_sequence(clnt, server, &msg, 7044 &args.seq_args, &res.seq_res); 7045 if (status) 7046 return status; 7047 7048 renew_lease(server, now); 7049 return 0; 7050 } 7051 7052 #ifdef CONFIG_NFS_V4_1 7053 7054 /* 7055 * This operation also signals the server that this client is 7056 * performing migration recovery. The server can stop asserting 7057 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 7058 * performing this operation is identified in the SEQUENCE 7059 * operation in this compound. 7060 * 7061 * When the client supports GETATTR(fs_locations_info), it can 7062 * be plumbed in here. 7063 */ 7064 static int _nfs41_proc_get_locations(struct inode *inode, 7065 struct nfs4_fs_locations *locations, 7066 struct page *page, struct rpc_cred *cred) 7067 { 7068 struct nfs_server *server = NFS_SERVER(inode); 7069 struct rpc_clnt *clnt = server->client; 7070 u32 bitmask[2] = { 7071 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 7072 }; 7073 struct nfs4_fs_locations_arg args = { 7074 .fh = NFS_FH(inode), 7075 .page = page, 7076 .bitmask = bitmask, 7077 .migration = 1, /* skip LOOKUP */ 7078 }; 7079 struct nfs4_fs_locations_res res = { 7080 .fs_locations = locations, 7081 .migration = 1, 7082 }; 7083 struct rpc_message msg = { 7084 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7085 .rpc_argp = &args, 7086 .rpc_resp = &res, 7087 .rpc_cred = cred, 7088 }; 7089 int status; 7090 7091 nfs_fattr_init(&locations->fattr); 7092 locations->server = server; 7093 locations->nlocations = 0; 7094 7095 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7096 nfs4_set_sequence_privileged(&args.seq_args); 7097 status = nfs4_call_sync_sequence(clnt, server, &msg, 7098 &args.seq_args, &res.seq_res); 7099 if (status == NFS4_OK && 7100 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7101 status = -NFS4ERR_LEASE_MOVED; 7102 return status; 7103 } 7104 7105 #endif /* CONFIG_NFS_V4_1 */ 7106 7107 /** 7108 * nfs4_proc_get_locations - discover locations for a migrated FSID 7109 * @inode: inode on FSID that is migrating 7110 * @locations: result of query 7111 * @page: buffer 7112 * @cred: credential to use for this operation 7113 * 7114 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 7115 * operation failed, or a negative errno if a local error occurred. 7116 * 7117 * On success, "locations" is filled in, but if the server has 7118 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 7119 * asserted. 7120 * 7121 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 7122 * from this client that require migration recovery. 7123 */ 7124 int nfs4_proc_get_locations(struct inode *inode, 7125 struct nfs4_fs_locations *locations, 7126 struct page *page, struct rpc_cred *cred) 7127 { 7128 struct nfs_server *server = NFS_SERVER(inode); 7129 struct nfs_client *clp = server->nfs_client; 7130 const struct nfs4_mig_recovery_ops *ops = 7131 clp->cl_mvops->mig_recovery_ops; 7132 struct nfs4_exception exception = { }; 7133 int status; 7134 7135 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7136 (unsigned long long)server->fsid.major, 7137 (unsigned long long)server->fsid.minor, 7138 clp->cl_hostname); 7139 nfs_display_fhandle(NFS_FH(inode), __func__); 7140 7141 do { 7142 status = ops->get_locations(inode, locations, page, cred); 7143 if (status != -NFS4ERR_DELAY) 7144 break; 7145 nfs4_handle_exception(server, status, &exception); 7146 } while (exception.retry); 7147 return status; 7148 } 7149 7150 /* 7151 * This operation also signals the server that this client is 7152 * performing "lease moved" recovery. The server can stop 7153 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 7154 * is appended to this compound to identify the client ID which is 7155 * performing recovery. 7156 */ 7157 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7158 { 7159 struct nfs_server *server = NFS_SERVER(inode); 7160 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 7161 struct rpc_clnt *clnt = server->client; 7162 struct nfs4_fsid_present_arg args = { 7163 .fh = NFS_FH(inode), 7164 .clientid = clp->cl_clientid, 7165 .renew = 1, /* append RENEW */ 7166 }; 7167 struct nfs4_fsid_present_res res = { 7168 .renew = 1, 7169 }; 7170 struct rpc_message msg = { 7171 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7172 .rpc_argp = &args, 7173 .rpc_resp = &res, 7174 .rpc_cred = cred, 7175 }; 7176 unsigned long now = jiffies; 7177 int status; 7178 7179 res.fh = nfs_alloc_fhandle(); 7180 if (res.fh == NULL) 7181 return -ENOMEM; 7182 7183 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7184 nfs4_set_sequence_privileged(&args.seq_args); 7185 status = nfs4_call_sync_sequence(clnt, server, &msg, 7186 &args.seq_args, &res.seq_res); 7187 nfs_free_fhandle(res.fh); 7188 if (status) 7189 return status; 7190 7191 do_renew_lease(clp, now); 7192 return 0; 7193 } 7194 7195 #ifdef CONFIG_NFS_V4_1 7196 7197 /* 7198 * This operation also signals the server that this client is 7199 * performing "lease moved" recovery. The server can stop asserting 7200 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 7201 * this operation is identified in the SEQUENCE operation in this 7202 * compound. 7203 */ 7204 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7205 { 7206 struct nfs_server *server = NFS_SERVER(inode); 7207 struct rpc_clnt *clnt = server->client; 7208 struct nfs4_fsid_present_arg args = { 7209 .fh = NFS_FH(inode), 7210 }; 7211 struct nfs4_fsid_present_res res = { 7212 }; 7213 struct rpc_message msg = { 7214 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 7215 .rpc_argp = &args, 7216 .rpc_resp = &res, 7217 .rpc_cred = cred, 7218 }; 7219 int status; 7220 7221 res.fh = nfs_alloc_fhandle(); 7222 if (res.fh == NULL) 7223 return -ENOMEM; 7224 7225 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 7226 nfs4_set_sequence_privileged(&args.seq_args); 7227 status = nfs4_call_sync_sequence(clnt, server, &msg, 7228 &args.seq_args, &res.seq_res); 7229 nfs_free_fhandle(res.fh); 7230 if (status == NFS4_OK && 7231 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 7232 status = -NFS4ERR_LEASE_MOVED; 7233 return status; 7234 } 7235 7236 #endif /* CONFIG_NFS_V4_1 */ 7237 7238 /** 7239 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 7240 * @inode: inode on FSID to check 7241 * @cred: credential to use for this operation 7242 * 7243 * Server indicates whether the FSID is present, moved, or not 7244 * recognized. This operation is necessary to clear a LEASE_MOVED 7245 * condition for this client ID. 7246 * 7247 * Returns NFS4_OK if the FSID is present on this server, 7248 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 7249 * NFS4ERR code if some error occurred on the server, or a 7250 * negative errno if a local failure occurred. 7251 */ 7252 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 7253 { 7254 struct nfs_server *server = NFS_SERVER(inode); 7255 struct nfs_client *clp = server->nfs_client; 7256 const struct nfs4_mig_recovery_ops *ops = 7257 clp->cl_mvops->mig_recovery_ops; 7258 struct nfs4_exception exception = { }; 7259 int status; 7260 7261 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 7262 (unsigned long long)server->fsid.major, 7263 (unsigned long long)server->fsid.minor, 7264 clp->cl_hostname); 7265 nfs_display_fhandle(NFS_FH(inode), __func__); 7266 7267 do { 7268 status = ops->fsid_present(inode, cred); 7269 if (status != -NFS4ERR_DELAY) 7270 break; 7271 nfs4_handle_exception(server, status, &exception); 7272 } while (exception.retry); 7273 return status; 7274 } 7275 7276 /** 7277 * If 'use_integrity' is true and the state managment nfs_client 7278 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 7279 * and the machine credential as per RFC3530bis and RFC5661 Security 7280 * Considerations sections. Otherwise, just use the user cred with the 7281 * filesystem's rpc_client. 7282 */ 7283 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7284 { 7285 int status; 7286 struct nfs4_secinfo_arg args = { 7287 .dir_fh = NFS_FH(dir), 7288 .name = name, 7289 }; 7290 struct nfs4_secinfo_res res = { 7291 .flavors = flavors, 7292 }; 7293 struct rpc_message msg = { 7294 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 7295 .rpc_argp = &args, 7296 .rpc_resp = &res, 7297 }; 7298 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 7299 struct rpc_cred *cred = NULL; 7300 7301 if (use_integrity) { 7302 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 7303 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 7304 msg.rpc_cred = cred; 7305 } 7306 7307 dprintk("NFS call secinfo %s\n", name->name); 7308 7309 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 7310 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 7311 7312 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 7313 &res.seq_res, 0); 7314 dprintk("NFS reply secinfo: %d\n", status); 7315 7316 if (cred) 7317 put_rpccred(cred); 7318 7319 return status; 7320 } 7321 7322 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 7323 struct nfs4_secinfo_flavors *flavors) 7324 { 7325 struct nfs4_exception exception = { }; 7326 int err; 7327 do { 7328 err = -NFS4ERR_WRONGSEC; 7329 7330 /* try to use integrity protection with machine cred */ 7331 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 7332 err = _nfs4_proc_secinfo(dir, name, flavors, true); 7333 7334 /* 7335 * if unable to use integrity protection, or SECINFO with 7336 * integrity protection returns NFS4ERR_WRONGSEC (which is 7337 * disallowed by spec, but exists in deployed servers) use 7338 * the current filesystem's rpc_client and the user cred. 7339 */ 7340 if (err == -NFS4ERR_WRONGSEC) 7341 err = _nfs4_proc_secinfo(dir, name, flavors, false); 7342 7343 trace_nfs4_secinfo(dir, name, err); 7344 err = nfs4_handle_exception(NFS_SERVER(dir), err, 7345 &exception); 7346 } while (exception.retry); 7347 return err; 7348 } 7349 7350 #ifdef CONFIG_NFS_V4_1 7351 /* 7352 * Check the exchange flags returned by the server for invalid flags, having 7353 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 7354 * DS flags set. 7355 */ 7356 static int nfs4_check_cl_exchange_flags(u32 flags) 7357 { 7358 if (flags & ~EXCHGID4_FLAG_MASK_R) 7359 goto out_inval; 7360 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 7361 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 7362 goto out_inval; 7363 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 7364 goto out_inval; 7365 return NFS_OK; 7366 out_inval: 7367 return -NFS4ERR_INVAL; 7368 } 7369 7370 static bool 7371 nfs41_same_server_scope(struct nfs41_server_scope *a, 7372 struct nfs41_server_scope *b) 7373 { 7374 if (a->server_scope_sz != b->server_scope_sz) 7375 return false; 7376 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 7377 } 7378 7379 static void 7380 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 7381 { 7382 } 7383 7384 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 7385 .rpc_call_done = &nfs4_bind_one_conn_to_session_done, 7386 }; 7387 7388 /* 7389 * nfs4_proc_bind_one_conn_to_session() 7390 * 7391 * The 4.1 client currently uses the same TCP connection for the 7392 * fore and backchannel. 7393 */ 7394 static 7395 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 7396 struct rpc_xprt *xprt, 7397 struct nfs_client *clp, 7398 struct rpc_cred *cred) 7399 { 7400 int status; 7401 struct nfs41_bind_conn_to_session_args args = { 7402 .client = clp, 7403 .dir = NFS4_CDFC4_FORE_OR_BOTH, 7404 }; 7405 struct nfs41_bind_conn_to_session_res res; 7406 struct rpc_message msg = { 7407 .rpc_proc = 7408 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 7409 .rpc_argp = &args, 7410 .rpc_resp = &res, 7411 .rpc_cred = cred, 7412 }; 7413 struct rpc_task_setup task_setup_data = { 7414 .rpc_client = clnt, 7415 .rpc_xprt = xprt, 7416 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 7417 .rpc_message = &msg, 7418 .flags = RPC_TASK_TIMEOUT, 7419 }; 7420 struct rpc_task *task; 7421 7422 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 7423 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 7424 args.dir = NFS4_CDFC4_FORE; 7425 7426 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 7427 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 7428 args.dir = NFS4_CDFC4_FORE; 7429 7430 task = rpc_run_task(&task_setup_data); 7431 if (!IS_ERR(task)) { 7432 status = task->tk_status; 7433 rpc_put_task(task); 7434 } else 7435 status = PTR_ERR(task); 7436 trace_nfs4_bind_conn_to_session(clp, status); 7437 if (status == 0) { 7438 if (memcmp(res.sessionid.data, 7439 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 7440 dprintk("NFS: %s: Session ID mismatch\n", __func__); 7441 return -EIO; 7442 } 7443 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 7444 dprintk("NFS: %s: Unexpected direction from server\n", 7445 __func__); 7446 return -EIO; 7447 } 7448 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 7449 dprintk("NFS: %s: Server returned RDMA mode = true\n", 7450 __func__); 7451 return -EIO; 7452 } 7453 } 7454 7455 return status; 7456 } 7457 7458 struct rpc_bind_conn_calldata { 7459 struct nfs_client *clp; 7460 struct rpc_cred *cred; 7461 }; 7462 7463 static int 7464 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 7465 struct rpc_xprt *xprt, 7466 void *calldata) 7467 { 7468 struct rpc_bind_conn_calldata *p = calldata; 7469 7470 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 7471 } 7472 7473 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 7474 { 7475 struct rpc_bind_conn_calldata data = { 7476 .clp = clp, 7477 .cred = cred, 7478 }; 7479 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 7480 nfs4_proc_bind_conn_to_session_callback, &data); 7481 } 7482 7483 /* 7484 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 7485 * and operations we'd like to see to enable certain features in the allow map 7486 */ 7487 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 7488 .how = SP4_MACH_CRED, 7489 .enforce.u.words = { 7490 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7491 1 << (OP_EXCHANGE_ID - 32) | 7492 1 << (OP_CREATE_SESSION - 32) | 7493 1 << (OP_DESTROY_SESSION - 32) | 7494 1 << (OP_DESTROY_CLIENTID - 32) 7495 }, 7496 .allow.u.words = { 7497 [0] = 1 << (OP_CLOSE) | 7498 1 << (OP_OPEN_DOWNGRADE) | 7499 1 << (OP_LOCKU) | 7500 1 << (OP_DELEGRETURN) | 7501 1 << (OP_COMMIT), 7502 [1] = 1 << (OP_SECINFO - 32) | 7503 1 << (OP_SECINFO_NO_NAME - 32) | 7504 1 << (OP_LAYOUTRETURN - 32) | 7505 1 << (OP_TEST_STATEID - 32) | 7506 1 << (OP_FREE_STATEID - 32) | 7507 1 << (OP_WRITE - 32) 7508 } 7509 }; 7510 7511 /* 7512 * Select the state protection mode for client `clp' given the server results 7513 * from exchange_id in `sp'. 7514 * 7515 * Returns 0 on success, negative errno otherwise. 7516 */ 7517 static int nfs4_sp4_select_mode(struct nfs_client *clp, 7518 struct nfs41_state_protection *sp) 7519 { 7520 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 7521 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 7522 1 << (OP_EXCHANGE_ID - 32) | 7523 1 << (OP_CREATE_SESSION - 32) | 7524 1 << (OP_DESTROY_SESSION - 32) | 7525 1 << (OP_DESTROY_CLIENTID - 32) 7526 }; 7527 unsigned long flags = 0; 7528 unsigned int i; 7529 int ret = 0; 7530 7531 if (sp->how == SP4_MACH_CRED) { 7532 /* Print state protect result */ 7533 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 7534 for (i = 0; i <= LAST_NFS4_OP; i++) { 7535 if (test_bit(i, sp->enforce.u.longs)) 7536 dfprintk(MOUNT, " enforce op %d\n", i); 7537 if (test_bit(i, sp->allow.u.longs)) 7538 dfprintk(MOUNT, " allow op %d\n", i); 7539 } 7540 7541 /* make sure nothing is on enforce list that isn't supported */ 7542 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 7543 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 7544 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7545 ret = -EINVAL; 7546 goto out; 7547 } 7548 } 7549 7550 /* 7551 * Minimal mode - state operations are allowed to use machine 7552 * credential. Note this already happens by default, so the 7553 * client doesn't have to do anything more than the negotiation. 7554 * 7555 * NOTE: we don't care if EXCHANGE_ID is in the list - 7556 * we're already using the machine cred for exchange_id 7557 * and will never use a different cred. 7558 */ 7559 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 7560 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 7561 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 7562 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 7563 dfprintk(MOUNT, "sp4_mach_cred:\n"); 7564 dfprintk(MOUNT, " minimal mode enabled\n"); 7565 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 7566 } else { 7567 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7568 ret = -EINVAL; 7569 goto out; 7570 } 7571 7572 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 7573 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 7574 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 7575 test_bit(OP_LOCKU, sp->allow.u.longs)) { 7576 dfprintk(MOUNT, " cleanup mode enabled\n"); 7577 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 7578 } 7579 7580 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 7581 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 7582 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 7583 } 7584 7585 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 7586 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 7587 dfprintk(MOUNT, " secinfo mode enabled\n"); 7588 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 7589 } 7590 7591 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 7592 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 7593 dfprintk(MOUNT, " stateid mode enabled\n"); 7594 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 7595 } 7596 7597 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 7598 dfprintk(MOUNT, " write mode enabled\n"); 7599 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 7600 } 7601 7602 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 7603 dfprintk(MOUNT, " commit mode enabled\n"); 7604 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 7605 } 7606 } 7607 out: 7608 clp->cl_sp4_flags = flags; 7609 return 0; 7610 } 7611 7612 struct nfs41_exchange_id_data { 7613 struct nfs41_exchange_id_res res; 7614 struct nfs41_exchange_id_args args; 7615 }; 7616 7617 static void nfs4_exchange_id_release(void *data) 7618 { 7619 struct nfs41_exchange_id_data *cdata = 7620 (struct nfs41_exchange_id_data *)data; 7621 7622 nfs_put_client(cdata->args.client); 7623 kfree(cdata->res.impl_id); 7624 kfree(cdata->res.server_scope); 7625 kfree(cdata->res.server_owner); 7626 kfree(cdata); 7627 } 7628 7629 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 7630 .rpc_release = nfs4_exchange_id_release, 7631 }; 7632 7633 /* 7634 * _nfs4_proc_exchange_id() 7635 * 7636 * Wrapper for EXCHANGE_ID operation. 7637 */ 7638 static struct rpc_task * 7639 nfs4_run_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7640 u32 sp4_how, struct rpc_xprt *xprt) 7641 { 7642 struct rpc_message msg = { 7643 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 7644 .rpc_cred = cred, 7645 }; 7646 struct rpc_task_setup task_setup_data = { 7647 .rpc_client = clp->cl_rpcclient, 7648 .callback_ops = &nfs4_exchange_id_call_ops, 7649 .rpc_message = &msg, 7650 .flags = RPC_TASK_TIMEOUT, 7651 }; 7652 struct nfs41_exchange_id_data *calldata; 7653 int status; 7654 7655 if (!refcount_inc_not_zero(&clp->cl_count)) 7656 return ERR_PTR(-EIO); 7657 7658 status = -ENOMEM; 7659 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7660 if (!calldata) 7661 goto out; 7662 7663 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 7664 7665 status = nfs4_init_uniform_client_string(clp); 7666 if (status) 7667 goto out_calldata; 7668 7669 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 7670 GFP_NOFS); 7671 status = -ENOMEM; 7672 if (unlikely(calldata->res.server_owner == NULL)) 7673 goto out_calldata; 7674 7675 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 7676 GFP_NOFS); 7677 if (unlikely(calldata->res.server_scope == NULL)) 7678 goto out_server_owner; 7679 7680 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 7681 if (unlikely(calldata->res.impl_id == NULL)) 7682 goto out_server_scope; 7683 7684 switch (sp4_how) { 7685 case SP4_NONE: 7686 calldata->args.state_protect.how = SP4_NONE; 7687 break; 7688 7689 case SP4_MACH_CRED: 7690 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 7691 break; 7692 7693 default: 7694 /* unsupported! */ 7695 WARN_ON_ONCE(1); 7696 status = -EINVAL; 7697 goto out_impl_id; 7698 } 7699 if (xprt) { 7700 task_setup_data.rpc_xprt = xprt; 7701 task_setup_data.flags |= RPC_TASK_SOFTCONN; 7702 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 7703 sizeof(calldata->args.verifier.data)); 7704 } 7705 calldata->args.client = clp; 7706 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 7707 EXCHGID4_FLAG_BIND_PRINC_STATEID; 7708 #ifdef CONFIG_NFS_V4_1_MIGRATION 7709 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 7710 #endif 7711 msg.rpc_argp = &calldata->args; 7712 msg.rpc_resp = &calldata->res; 7713 task_setup_data.callback_data = calldata; 7714 7715 return rpc_run_task(&task_setup_data); 7716 7717 out_impl_id: 7718 kfree(calldata->res.impl_id); 7719 out_server_scope: 7720 kfree(calldata->res.server_scope); 7721 out_server_owner: 7722 kfree(calldata->res.server_owner); 7723 out_calldata: 7724 kfree(calldata); 7725 out: 7726 nfs_put_client(clp); 7727 return ERR_PTR(status); 7728 } 7729 7730 /* 7731 * _nfs4_proc_exchange_id() 7732 * 7733 * Wrapper for EXCHANGE_ID operation. 7734 */ 7735 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7736 u32 sp4_how) 7737 { 7738 struct rpc_task *task; 7739 struct nfs41_exchange_id_args *argp; 7740 struct nfs41_exchange_id_res *resp; 7741 int status; 7742 7743 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 7744 if (IS_ERR(task)) 7745 return PTR_ERR(task); 7746 7747 argp = task->tk_msg.rpc_argp; 7748 resp = task->tk_msg.rpc_resp; 7749 status = task->tk_status; 7750 if (status != 0) 7751 goto out; 7752 7753 status = nfs4_check_cl_exchange_flags(resp->flags); 7754 if (status != 0) 7755 goto out; 7756 7757 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 7758 if (status != 0) 7759 goto out; 7760 7761 clp->cl_clientid = resp->clientid; 7762 clp->cl_exchange_flags = resp->flags; 7763 clp->cl_seqid = resp->seqid; 7764 /* Client ID is not confirmed */ 7765 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 7766 clear_bit(NFS4_SESSION_ESTABLISHED, 7767 &clp->cl_session->session_state); 7768 7769 if (clp->cl_serverscope != NULL && 7770 !nfs41_same_server_scope(clp->cl_serverscope, 7771 resp->server_scope)) { 7772 dprintk("%s: server_scope mismatch detected\n", 7773 __func__); 7774 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 7775 } 7776 7777 swap(clp->cl_serverowner, resp->server_owner); 7778 swap(clp->cl_serverscope, resp->server_scope); 7779 swap(clp->cl_implid, resp->impl_id); 7780 7781 /* Save the EXCHANGE_ID verifier session trunk tests */ 7782 memcpy(clp->cl_confirm.data, argp->verifier.data, 7783 sizeof(clp->cl_confirm.data)); 7784 out: 7785 trace_nfs4_exchange_id(clp, status); 7786 rpc_put_task(task); 7787 return status; 7788 } 7789 7790 /* 7791 * nfs4_proc_exchange_id() 7792 * 7793 * Returns zero, a negative errno, or a negative NFS4ERR status code. 7794 * 7795 * Since the clientid has expired, all compounds using sessions 7796 * associated with the stale clientid will be returning 7797 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 7798 * be in some phase of session reset. 7799 * 7800 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 7801 */ 7802 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 7803 { 7804 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 7805 int status; 7806 7807 /* try SP4_MACH_CRED if krb5i/p */ 7808 if (authflavor == RPC_AUTH_GSS_KRB5I || 7809 authflavor == RPC_AUTH_GSS_KRB5P) { 7810 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 7811 if (!status) 7812 return 0; 7813 } 7814 7815 /* try SP4_NONE */ 7816 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 7817 } 7818 7819 /** 7820 * nfs4_test_session_trunk 7821 * 7822 * This is an add_xprt_test() test function called from 7823 * rpc_clnt_setup_test_and_add_xprt. 7824 * 7825 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 7826 * and is dereferrenced in nfs4_exchange_id_release 7827 * 7828 * Upon success, add the new transport to the rpc_clnt 7829 * 7830 * @clnt: struct rpc_clnt to get new transport 7831 * @xprt: the rpc_xprt to test 7832 * @data: call data for _nfs4_proc_exchange_id. 7833 */ 7834 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 7835 void *data) 7836 { 7837 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; 7838 struct rpc_task *task; 7839 int status; 7840 7841 u32 sp4_how; 7842 7843 dprintk("--> %s try %s\n", __func__, 7844 xprt->address_strings[RPC_DISPLAY_ADDR]); 7845 7846 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 7847 7848 /* Test connection for session trunking. Async exchange_id call */ 7849 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 7850 if (IS_ERR(task)) 7851 return PTR_ERR(task); 7852 7853 status = task->tk_status; 7854 if (status == 0) 7855 status = nfs4_detect_session_trunking(adata->clp, 7856 task->tk_msg.rpc_resp, xprt); 7857 7858 rpc_put_task(task); 7859 return status; 7860 } 7861 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 7862 7863 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 7864 struct rpc_cred *cred) 7865 { 7866 struct rpc_message msg = { 7867 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 7868 .rpc_argp = clp, 7869 .rpc_cred = cred, 7870 }; 7871 int status; 7872 7873 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7874 trace_nfs4_destroy_clientid(clp, status); 7875 if (status) 7876 dprintk("NFS: Got error %d from the server %s on " 7877 "DESTROY_CLIENTID.", status, clp->cl_hostname); 7878 return status; 7879 } 7880 7881 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 7882 struct rpc_cred *cred) 7883 { 7884 unsigned int loop; 7885 int ret; 7886 7887 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 7888 ret = _nfs4_proc_destroy_clientid(clp, cred); 7889 switch (ret) { 7890 case -NFS4ERR_DELAY: 7891 case -NFS4ERR_CLIENTID_BUSY: 7892 ssleep(1); 7893 break; 7894 default: 7895 return ret; 7896 } 7897 } 7898 return 0; 7899 } 7900 7901 int nfs4_destroy_clientid(struct nfs_client *clp) 7902 { 7903 struct rpc_cred *cred; 7904 int ret = 0; 7905 7906 if (clp->cl_mvops->minor_version < 1) 7907 goto out; 7908 if (clp->cl_exchange_flags == 0) 7909 goto out; 7910 if (clp->cl_preserve_clid) 7911 goto out; 7912 cred = nfs4_get_clid_cred(clp); 7913 ret = nfs4_proc_destroy_clientid(clp, cred); 7914 if (cred) 7915 put_rpccred(cred); 7916 switch (ret) { 7917 case 0: 7918 case -NFS4ERR_STALE_CLIENTID: 7919 clp->cl_exchange_flags = 0; 7920 } 7921 out: 7922 return ret; 7923 } 7924 7925 struct nfs4_get_lease_time_data { 7926 struct nfs4_get_lease_time_args *args; 7927 struct nfs4_get_lease_time_res *res; 7928 struct nfs_client *clp; 7929 }; 7930 7931 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 7932 void *calldata) 7933 { 7934 struct nfs4_get_lease_time_data *data = 7935 (struct nfs4_get_lease_time_data *)calldata; 7936 7937 dprintk("--> %s\n", __func__); 7938 /* just setup sequence, do not trigger session recovery 7939 since we're invoked within one */ 7940 nfs4_setup_sequence(data->clp, 7941 &data->args->la_seq_args, 7942 &data->res->lr_seq_res, 7943 task); 7944 dprintk("<-- %s\n", __func__); 7945 } 7946 7947 /* 7948 * Called from nfs4_state_manager thread for session setup, so don't recover 7949 * from sequence operation or clientid errors. 7950 */ 7951 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 7952 { 7953 struct nfs4_get_lease_time_data *data = 7954 (struct nfs4_get_lease_time_data *)calldata; 7955 7956 dprintk("--> %s\n", __func__); 7957 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 7958 return; 7959 switch (task->tk_status) { 7960 case -NFS4ERR_DELAY: 7961 case -NFS4ERR_GRACE: 7962 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 7963 rpc_delay(task, NFS4_POLL_RETRY_MIN); 7964 task->tk_status = 0; 7965 /* fall through */ 7966 case -NFS4ERR_RETRY_UNCACHED_REP: 7967 rpc_restart_call_prepare(task); 7968 return; 7969 } 7970 dprintk("<-- %s\n", __func__); 7971 } 7972 7973 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 7974 .rpc_call_prepare = nfs4_get_lease_time_prepare, 7975 .rpc_call_done = nfs4_get_lease_time_done, 7976 }; 7977 7978 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 7979 { 7980 struct rpc_task *task; 7981 struct nfs4_get_lease_time_args args; 7982 struct nfs4_get_lease_time_res res = { 7983 .lr_fsinfo = fsinfo, 7984 }; 7985 struct nfs4_get_lease_time_data data = { 7986 .args = &args, 7987 .res = &res, 7988 .clp = clp, 7989 }; 7990 struct rpc_message msg = { 7991 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 7992 .rpc_argp = &args, 7993 .rpc_resp = &res, 7994 }; 7995 struct rpc_task_setup task_setup = { 7996 .rpc_client = clp->cl_rpcclient, 7997 .rpc_message = &msg, 7998 .callback_ops = &nfs4_get_lease_time_ops, 7999 .callback_data = &data, 8000 .flags = RPC_TASK_TIMEOUT, 8001 }; 8002 int status; 8003 8004 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 8005 nfs4_set_sequence_privileged(&args.la_seq_args); 8006 task = rpc_run_task(&task_setup); 8007 8008 if (IS_ERR(task)) 8009 return PTR_ERR(task); 8010 8011 status = task->tk_status; 8012 rpc_put_task(task); 8013 return status; 8014 } 8015 8016 /* 8017 * Initialize the values to be used by the client in CREATE_SESSION 8018 * If nfs4_init_session set the fore channel request and response sizes, 8019 * use them. 8020 * 8021 * Set the back channel max_resp_sz_cached to zero to force the client to 8022 * always set csa_cachethis to FALSE because the current implementation 8023 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 8024 */ 8025 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 8026 struct rpc_clnt *clnt) 8027 { 8028 unsigned int max_rqst_sz, max_resp_sz; 8029 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 8030 8031 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 8032 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 8033 8034 /* Fore channel attributes */ 8035 args->fc_attrs.max_rqst_sz = max_rqst_sz; 8036 args->fc_attrs.max_resp_sz = max_resp_sz; 8037 args->fc_attrs.max_ops = NFS4_MAX_OPS; 8038 args->fc_attrs.max_reqs = max_session_slots; 8039 8040 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 8041 "max_ops=%u max_reqs=%u\n", 8042 __func__, 8043 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 8044 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 8045 8046 /* Back channel attributes */ 8047 args->bc_attrs.max_rqst_sz = max_bc_payload; 8048 args->bc_attrs.max_resp_sz = max_bc_payload; 8049 args->bc_attrs.max_resp_sz_cached = 0; 8050 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 8051 args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1); 8052 8053 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 8054 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 8055 __func__, 8056 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 8057 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 8058 args->bc_attrs.max_reqs); 8059 } 8060 8061 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 8062 struct nfs41_create_session_res *res) 8063 { 8064 struct nfs4_channel_attrs *sent = &args->fc_attrs; 8065 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 8066 8067 if (rcvd->max_resp_sz > sent->max_resp_sz) 8068 return -EINVAL; 8069 /* 8070 * Our requested max_ops is the minimum we need; we're not 8071 * prepared to break up compounds into smaller pieces than that. 8072 * So, no point even trying to continue if the server won't 8073 * cooperate: 8074 */ 8075 if (rcvd->max_ops < sent->max_ops) 8076 return -EINVAL; 8077 if (rcvd->max_reqs == 0) 8078 return -EINVAL; 8079 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 8080 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 8081 return 0; 8082 } 8083 8084 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 8085 struct nfs41_create_session_res *res) 8086 { 8087 struct nfs4_channel_attrs *sent = &args->bc_attrs; 8088 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 8089 8090 if (!(res->flags & SESSION4_BACK_CHAN)) 8091 goto out; 8092 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 8093 return -EINVAL; 8094 if (rcvd->max_resp_sz < sent->max_resp_sz) 8095 return -EINVAL; 8096 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 8097 return -EINVAL; 8098 if (rcvd->max_ops > sent->max_ops) 8099 return -EINVAL; 8100 if (rcvd->max_reqs > sent->max_reqs) 8101 return -EINVAL; 8102 out: 8103 return 0; 8104 } 8105 8106 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 8107 struct nfs41_create_session_res *res) 8108 { 8109 int ret; 8110 8111 ret = nfs4_verify_fore_channel_attrs(args, res); 8112 if (ret) 8113 return ret; 8114 return nfs4_verify_back_channel_attrs(args, res); 8115 } 8116 8117 static void nfs4_update_session(struct nfs4_session *session, 8118 struct nfs41_create_session_res *res) 8119 { 8120 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 8121 /* Mark client id and session as being confirmed */ 8122 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 8123 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 8124 session->flags = res->flags; 8125 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 8126 if (res->flags & SESSION4_BACK_CHAN) 8127 memcpy(&session->bc_attrs, &res->bc_attrs, 8128 sizeof(session->bc_attrs)); 8129 } 8130 8131 static int _nfs4_proc_create_session(struct nfs_client *clp, 8132 struct rpc_cred *cred) 8133 { 8134 struct nfs4_session *session = clp->cl_session; 8135 struct nfs41_create_session_args args = { 8136 .client = clp, 8137 .clientid = clp->cl_clientid, 8138 .seqid = clp->cl_seqid, 8139 .cb_program = NFS4_CALLBACK, 8140 }; 8141 struct nfs41_create_session_res res; 8142 8143 struct rpc_message msg = { 8144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 8145 .rpc_argp = &args, 8146 .rpc_resp = &res, 8147 .rpc_cred = cred, 8148 }; 8149 int status; 8150 8151 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 8152 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 8153 8154 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8155 trace_nfs4_create_session(clp, status); 8156 8157 switch (status) { 8158 case -NFS4ERR_STALE_CLIENTID: 8159 case -NFS4ERR_DELAY: 8160 case -ETIMEDOUT: 8161 case -EACCES: 8162 case -EAGAIN: 8163 goto out; 8164 }; 8165 8166 clp->cl_seqid++; 8167 if (!status) { 8168 /* Verify the session's negotiated channel_attrs values */ 8169 status = nfs4_verify_channel_attrs(&args, &res); 8170 /* Increment the clientid slot sequence id */ 8171 if (status) 8172 goto out; 8173 nfs4_update_session(session, &res); 8174 } 8175 out: 8176 return status; 8177 } 8178 8179 /* 8180 * Issues a CREATE_SESSION operation to the server. 8181 * It is the responsibility of the caller to verify the session is 8182 * expired before calling this routine. 8183 */ 8184 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 8185 { 8186 int status; 8187 unsigned *ptr; 8188 struct nfs4_session *session = clp->cl_session; 8189 8190 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 8191 8192 status = _nfs4_proc_create_session(clp, cred); 8193 if (status) 8194 goto out; 8195 8196 /* Init or reset the session slot tables */ 8197 status = nfs4_setup_session_slot_tables(session); 8198 dprintk("slot table setup returned %d\n", status); 8199 if (status) 8200 goto out; 8201 8202 ptr = (unsigned *)&session->sess_id.data[0]; 8203 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 8204 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 8205 out: 8206 dprintk("<-- %s\n", __func__); 8207 return status; 8208 } 8209 8210 /* 8211 * Issue the over-the-wire RPC DESTROY_SESSION. 8212 * The caller must serialize access to this routine. 8213 */ 8214 int nfs4_proc_destroy_session(struct nfs4_session *session, 8215 struct rpc_cred *cred) 8216 { 8217 struct rpc_message msg = { 8218 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 8219 .rpc_argp = session, 8220 .rpc_cred = cred, 8221 }; 8222 int status = 0; 8223 8224 dprintk("--> nfs4_proc_destroy_session\n"); 8225 8226 /* session is still being setup */ 8227 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 8228 return 0; 8229 8230 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 8231 trace_nfs4_destroy_session(session->clp, status); 8232 8233 if (status) 8234 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 8235 "Session has been destroyed regardless...\n", status); 8236 8237 dprintk("<-- nfs4_proc_destroy_session\n"); 8238 return status; 8239 } 8240 8241 /* 8242 * Renew the cl_session lease. 8243 */ 8244 struct nfs4_sequence_data { 8245 struct nfs_client *clp; 8246 struct nfs4_sequence_args args; 8247 struct nfs4_sequence_res res; 8248 }; 8249 8250 static void nfs41_sequence_release(void *data) 8251 { 8252 struct nfs4_sequence_data *calldata = data; 8253 struct nfs_client *clp = calldata->clp; 8254 8255 if (refcount_read(&clp->cl_count) > 1) 8256 nfs4_schedule_state_renewal(clp); 8257 nfs_put_client(clp); 8258 kfree(calldata); 8259 } 8260 8261 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8262 { 8263 switch(task->tk_status) { 8264 case -NFS4ERR_DELAY: 8265 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8266 return -EAGAIN; 8267 default: 8268 nfs4_schedule_lease_recovery(clp); 8269 } 8270 return 0; 8271 } 8272 8273 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 8274 { 8275 struct nfs4_sequence_data *calldata = data; 8276 struct nfs_client *clp = calldata->clp; 8277 8278 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 8279 return; 8280 8281 trace_nfs4_sequence(clp, task->tk_status); 8282 if (task->tk_status < 0) { 8283 dprintk("%s ERROR %d\n", __func__, task->tk_status); 8284 if (refcount_read(&clp->cl_count) == 1) 8285 goto out; 8286 8287 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 8288 rpc_restart_call_prepare(task); 8289 return; 8290 } 8291 } 8292 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 8293 out: 8294 dprintk("<-- %s\n", __func__); 8295 } 8296 8297 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 8298 { 8299 struct nfs4_sequence_data *calldata = data; 8300 struct nfs_client *clp = calldata->clp; 8301 struct nfs4_sequence_args *args; 8302 struct nfs4_sequence_res *res; 8303 8304 args = task->tk_msg.rpc_argp; 8305 res = task->tk_msg.rpc_resp; 8306 8307 nfs4_setup_sequence(clp, args, res, task); 8308 } 8309 8310 static const struct rpc_call_ops nfs41_sequence_ops = { 8311 .rpc_call_done = nfs41_sequence_call_done, 8312 .rpc_call_prepare = nfs41_sequence_prepare, 8313 .rpc_release = nfs41_sequence_release, 8314 }; 8315 8316 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 8317 struct rpc_cred *cred, 8318 struct nfs4_slot *slot, 8319 bool is_privileged) 8320 { 8321 struct nfs4_sequence_data *calldata; 8322 struct rpc_message msg = { 8323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 8324 .rpc_cred = cred, 8325 }; 8326 struct rpc_task_setup task_setup_data = { 8327 .rpc_client = clp->cl_rpcclient, 8328 .rpc_message = &msg, 8329 .callback_ops = &nfs41_sequence_ops, 8330 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 8331 }; 8332 struct rpc_task *ret; 8333 8334 ret = ERR_PTR(-EIO); 8335 if (!refcount_inc_not_zero(&clp->cl_count)) 8336 goto out_err; 8337 8338 ret = ERR_PTR(-ENOMEM); 8339 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8340 if (calldata == NULL) 8341 goto out_put_clp; 8342 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 8343 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 8344 if (is_privileged) 8345 nfs4_set_sequence_privileged(&calldata->args); 8346 msg.rpc_argp = &calldata->args; 8347 msg.rpc_resp = &calldata->res; 8348 calldata->clp = clp; 8349 task_setup_data.callback_data = calldata; 8350 8351 ret = rpc_run_task(&task_setup_data); 8352 if (IS_ERR(ret)) 8353 goto out_err; 8354 return ret; 8355 out_put_clp: 8356 nfs_put_client(clp); 8357 out_err: 8358 nfs41_release_slot(slot); 8359 return ret; 8360 } 8361 8362 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 8363 { 8364 struct rpc_task *task; 8365 int ret = 0; 8366 8367 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 8368 return -EAGAIN; 8369 task = _nfs41_proc_sequence(clp, cred, NULL, false); 8370 if (IS_ERR(task)) 8371 ret = PTR_ERR(task); 8372 else 8373 rpc_put_task_async(task); 8374 dprintk("<-- %s status=%d\n", __func__, ret); 8375 return ret; 8376 } 8377 8378 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 8379 { 8380 struct rpc_task *task; 8381 int ret; 8382 8383 task = _nfs41_proc_sequence(clp, cred, NULL, true); 8384 if (IS_ERR(task)) { 8385 ret = PTR_ERR(task); 8386 goto out; 8387 } 8388 ret = rpc_wait_for_completion_task(task); 8389 if (!ret) 8390 ret = task->tk_status; 8391 rpc_put_task(task); 8392 out: 8393 dprintk("<-- %s status=%d\n", __func__, ret); 8394 return ret; 8395 } 8396 8397 struct nfs4_reclaim_complete_data { 8398 struct nfs_client *clp; 8399 struct nfs41_reclaim_complete_args arg; 8400 struct nfs41_reclaim_complete_res res; 8401 }; 8402 8403 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 8404 { 8405 struct nfs4_reclaim_complete_data *calldata = data; 8406 8407 nfs4_setup_sequence(calldata->clp, 8408 &calldata->arg.seq_args, 8409 &calldata->res.seq_res, 8410 task); 8411 } 8412 8413 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 8414 { 8415 switch(task->tk_status) { 8416 case 0: 8417 case -NFS4ERR_COMPLETE_ALREADY: 8418 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 8419 break; 8420 case -NFS4ERR_DELAY: 8421 rpc_delay(task, NFS4_POLL_RETRY_MAX); 8422 /* fall through */ 8423 case -NFS4ERR_RETRY_UNCACHED_REP: 8424 return -EAGAIN; 8425 case -NFS4ERR_BADSESSION: 8426 case -NFS4ERR_DEADSESSION: 8427 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 8428 nfs4_schedule_session_recovery(clp->cl_session, 8429 task->tk_status); 8430 break; 8431 default: 8432 nfs4_schedule_lease_recovery(clp); 8433 } 8434 return 0; 8435 } 8436 8437 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 8438 { 8439 struct nfs4_reclaim_complete_data *calldata = data; 8440 struct nfs_client *clp = calldata->clp; 8441 struct nfs4_sequence_res *res = &calldata->res.seq_res; 8442 8443 dprintk("--> %s\n", __func__); 8444 if (!nfs41_sequence_done(task, res)) 8445 return; 8446 8447 trace_nfs4_reclaim_complete(clp, task->tk_status); 8448 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 8449 rpc_restart_call_prepare(task); 8450 return; 8451 } 8452 dprintk("<-- %s\n", __func__); 8453 } 8454 8455 static void nfs4_free_reclaim_complete_data(void *data) 8456 { 8457 struct nfs4_reclaim_complete_data *calldata = data; 8458 8459 kfree(calldata); 8460 } 8461 8462 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 8463 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 8464 .rpc_call_done = nfs4_reclaim_complete_done, 8465 .rpc_release = nfs4_free_reclaim_complete_data, 8466 }; 8467 8468 /* 8469 * Issue a global reclaim complete. 8470 */ 8471 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 8472 struct rpc_cred *cred) 8473 { 8474 struct nfs4_reclaim_complete_data *calldata; 8475 struct rpc_task *task; 8476 struct rpc_message msg = { 8477 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 8478 .rpc_cred = cred, 8479 }; 8480 struct rpc_task_setup task_setup_data = { 8481 .rpc_client = clp->cl_rpcclient, 8482 .rpc_message = &msg, 8483 .callback_ops = &nfs4_reclaim_complete_call_ops, 8484 .flags = RPC_TASK_ASYNC, 8485 }; 8486 int status = -ENOMEM; 8487 8488 dprintk("--> %s\n", __func__); 8489 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8490 if (calldata == NULL) 8491 goto out; 8492 calldata->clp = clp; 8493 calldata->arg.one_fs = 0; 8494 8495 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 8496 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 8497 msg.rpc_argp = &calldata->arg; 8498 msg.rpc_resp = &calldata->res; 8499 task_setup_data.callback_data = calldata; 8500 task = rpc_run_task(&task_setup_data); 8501 if (IS_ERR(task)) { 8502 status = PTR_ERR(task); 8503 goto out; 8504 } 8505 status = rpc_wait_for_completion_task(task); 8506 if (status == 0) 8507 status = task->tk_status; 8508 rpc_put_task(task); 8509 out: 8510 dprintk("<-- %s status=%d\n", __func__, status); 8511 return status; 8512 } 8513 8514 static void 8515 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 8516 { 8517 struct nfs4_layoutget *lgp = calldata; 8518 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 8519 8520 dprintk("--> %s\n", __func__); 8521 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 8522 &lgp->res.seq_res, task); 8523 dprintk("<-- %s\n", __func__); 8524 } 8525 8526 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 8527 { 8528 struct nfs4_layoutget *lgp = calldata; 8529 8530 dprintk("--> %s\n", __func__); 8531 nfs41_sequence_process(task, &lgp->res.seq_res); 8532 dprintk("<-- %s\n", __func__); 8533 } 8534 8535 static int 8536 nfs4_layoutget_handle_exception(struct rpc_task *task, 8537 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 8538 { 8539 struct inode *inode = lgp->args.inode; 8540 struct nfs_server *server = NFS_SERVER(inode); 8541 struct pnfs_layout_hdr *lo; 8542 int nfs4err = task->tk_status; 8543 int err, status = 0; 8544 LIST_HEAD(head); 8545 8546 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 8547 8548 switch (nfs4err) { 8549 case 0: 8550 goto out; 8551 8552 /* 8553 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 8554 * on the file. set tk_status to -ENODATA to tell upper layer to 8555 * retry go inband. 8556 */ 8557 case -NFS4ERR_LAYOUTUNAVAILABLE: 8558 status = -ENODATA; 8559 goto out; 8560 /* 8561 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 8562 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 8563 */ 8564 case -NFS4ERR_BADLAYOUT: 8565 status = -EOVERFLOW; 8566 goto out; 8567 /* 8568 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 8569 * (or clients) writing to the same RAID stripe except when 8570 * the minlength argument is 0 (see RFC5661 section 18.43.3). 8571 * 8572 * Treat it like we would RECALLCONFLICT -- we retry for a little 8573 * while, and then eventually give up. 8574 */ 8575 case -NFS4ERR_LAYOUTTRYLATER: 8576 if (lgp->args.minlength == 0) { 8577 status = -EOVERFLOW; 8578 goto out; 8579 } 8580 status = -EBUSY; 8581 break; 8582 case -NFS4ERR_RECALLCONFLICT: 8583 status = -ERECALLCONFLICT; 8584 break; 8585 case -NFS4ERR_DELEG_REVOKED: 8586 case -NFS4ERR_ADMIN_REVOKED: 8587 case -NFS4ERR_EXPIRED: 8588 case -NFS4ERR_BAD_STATEID: 8589 exception->timeout = 0; 8590 spin_lock(&inode->i_lock); 8591 lo = NFS_I(inode)->layout; 8592 /* If the open stateid was bad, then recover it. */ 8593 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 8594 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 8595 spin_unlock(&inode->i_lock); 8596 exception->state = lgp->args.ctx->state; 8597 exception->stateid = &lgp->args.stateid; 8598 break; 8599 } 8600 8601 /* 8602 * Mark the bad layout state as invalid, then retry 8603 */ 8604 pnfs_mark_layout_stateid_invalid(lo, &head); 8605 spin_unlock(&inode->i_lock); 8606 nfs_commit_inode(inode, 0); 8607 pnfs_free_lseg_list(&head); 8608 status = -EAGAIN; 8609 goto out; 8610 } 8611 8612 nfs4_sequence_free_slot(&lgp->res.seq_res); 8613 err = nfs4_handle_exception(server, nfs4err, exception); 8614 if (!status) { 8615 if (exception->retry) 8616 status = -EAGAIN; 8617 else 8618 status = err; 8619 } 8620 out: 8621 dprintk("<-- %s\n", __func__); 8622 return status; 8623 } 8624 8625 static size_t max_response_pages(struct nfs_server *server) 8626 { 8627 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 8628 return nfs_page_array_len(0, max_resp_sz); 8629 } 8630 8631 static void nfs4_free_pages(struct page **pages, size_t size) 8632 { 8633 int i; 8634 8635 if (!pages) 8636 return; 8637 8638 for (i = 0; i < size; i++) { 8639 if (!pages[i]) 8640 break; 8641 __free_page(pages[i]); 8642 } 8643 kfree(pages); 8644 } 8645 8646 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 8647 { 8648 struct page **pages; 8649 int i; 8650 8651 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 8652 if (!pages) { 8653 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 8654 return NULL; 8655 } 8656 8657 for (i = 0; i < size; i++) { 8658 pages[i] = alloc_page(gfp_flags); 8659 if (!pages[i]) { 8660 dprintk("%s: failed to allocate page\n", __func__); 8661 nfs4_free_pages(pages, size); 8662 return NULL; 8663 } 8664 } 8665 8666 return pages; 8667 } 8668 8669 static void nfs4_layoutget_release(void *calldata) 8670 { 8671 struct nfs4_layoutget *lgp = calldata; 8672 struct inode *inode = lgp->args.inode; 8673 struct nfs_server *server = NFS_SERVER(inode); 8674 size_t max_pages = max_response_pages(server); 8675 8676 dprintk("--> %s\n", __func__); 8677 nfs4_sequence_free_slot(&lgp->res.seq_res); 8678 nfs4_free_pages(lgp->args.layout.pages, max_pages); 8679 pnfs_put_layout_hdr(NFS_I(inode)->layout); 8680 put_nfs_open_context(lgp->args.ctx); 8681 kfree(calldata); 8682 dprintk("<-- %s\n", __func__); 8683 } 8684 8685 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 8686 .rpc_call_prepare = nfs4_layoutget_prepare, 8687 .rpc_call_done = nfs4_layoutget_done, 8688 .rpc_release = nfs4_layoutget_release, 8689 }; 8690 8691 struct pnfs_layout_segment * 8692 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags) 8693 { 8694 struct inode *inode = lgp->args.inode; 8695 struct nfs_server *server = NFS_SERVER(inode); 8696 size_t max_pages = max_response_pages(server); 8697 struct rpc_task *task; 8698 struct rpc_message msg = { 8699 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 8700 .rpc_argp = &lgp->args, 8701 .rpc_resp = &lgp->res, 8702 .rpc_cred = lgp->cred, 8703 }; 8704 struct rpc_task_setup task_setup_data = { 8705 .rpc_client = server->client, 8706 .rpc_message = &msg, 8707 .callback_ops = &nfs4_layoutget_call_ops, 8708 .callback_data = lgp, 8709 .flags = RPC_TASK_ASYNC, 8710 }; 8711 struct pnfs_layout_segment *lseg = NULL; 8712 struct nfs4_exception exception = { 8713 .inode = inode, 8714 .timeout = *timeout, 8715 }; 8716 int status = 0; 8717 8718 dprintk("--> %s\n", __func__); 8719 8720 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 8721 pnfs_get_layout_hdr(NFS_I(inode)->layout); 8722 8723 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 8724 if (!lgp->args.layout.pages) { 8725 nfs4_layoutget_release(lgp); 8726 return ERR_PTR(-ENOMEM); 8727 } 8728 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 8729 8730 lgp->res.layoutp = &lgp->args.layout; 8731 lgp->res.seq_res.sr_slot = NULL; 8732 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 8733 8734 task = rpc_run_task(&task_setup_data); 8735 if (IS_ERR(task)) 8736 return ERR_CAST(task); 8737 status = rpc_wait_for_completion_task(task); 8738 if (status == 0) { 8739 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 8740 *timeout = exception.timeout; 8741 } 8742 8743 trace_nfs4_layoutget(lgp->args.ctx, 8744 &lgp->args.range, 8745 &lgp->res.range, 8746 &lgp->res.stateid, 8747 status); 8748 8749 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 8750 if (status == 0 && lgp->res.layoutp->len) 8751 lseg = pnfs_layout_process(lgp); 8752 rpc_put_task(task); 8753 dprintk("<-- %s status=%d\n", __func__, status); 8754 if (status) 8755 return ERR_PTR(status); 8756 return lseg; 8757 } 8758 8759 static void 8760 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 8761 { 8762 struct nfs4_layoutreturn *lrp = calldata; 8763 8764 dprintk("--> %s\n", __func__); 8765 nfs4_setup_sequence(lrp->clp, 8766 &lrp->args.seq_args, 8767 &lrp->res.seq_res, 8768 task); 8769 } 8770 8771 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 8772 { 8773 struct nfs4_layoutreturn *lrp = calldata; 8774 struct nfs_server *server; 8775 8776 dprintk("--> %s\n", __func__); 8777 8778 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 8779 return; 8780 8781 server = NFS_SERVER(lrp->args.inode); 8782 switch (task->tk_status) { 8783 case -NFS4ERR_OLD_STATEID: 8784 if (nfs4_refresh_layout_stateid(&lrp->args.stateid, 8785 lrp->args.inode)) 8786 goto out_restart; 8787 /* Fallthrough */ 8788 default: 8789 task->tk_status = 0; 8790 /* Fallthrough */ 8791 case 0: 8792 break; 8793 case -NFS4ERR_DELAY: 8794 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 8795 break; 8796 goto out_restart; 8797 } 8798 dprintk("<-- %s\n", __func__); 8799 return; 8800 out_restart: 8801 task->tk_status = 0; 8802 nfs4_sequence_free_slot(&lrp->res.seq_res); 8803 rpc_restart_call_prepare(task); 8804 } 8805 8806 static void nfs4_layoutreturn_release(void *calldata) 8807 { 8808 struct nfs4_layoutreturn *lrp = calldata; 8809 struct pnfs_layout_hdr *lo = lrp->args.layout; 8810 8811 dprintk("--> %s\n", __func__); 8812 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 8813 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 8814 nfs4_sequence_free_slot(&lrp->res.seq_res); 8815 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 8816 lrp->ld_private.ops->free(&lrp->ld_private); 8817 pnfs_put_layout_hdr(lrp->args.layout); 8818 nfs_iput_and_deactive(lrp->inode); 8819 kfree(calldata); 8820 dprintk("<-- %s\n", __func__); 8821 } 8822 8823 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 8824 .rpc_call_prepare = nfs4_layoutreturn_prepare, 8825 .rpc_call_done = nfs4_layoutreturn_done, 8826 .rpc_release = nfs4_layoutreturn_release, 8827 }; 8828 8829 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 8830 { 8831 struct rpc_task *task; 8832 struct rpc_message msg = { 8833 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 8834 .rpc_argp = &lrp->args, 8835 .rpc_resp = &lrp->res, 8836 .rpc_cred = lrp->cred, 8837 }; 8838 struct rpc_task_setup task_setup_data = { 8839 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 8840 .rpc_message = &msg, 8841 .callback_ops = &nfs4_layoutreturn_call_ops, 8842 .callback_data = lrp, 8843 }; 8844 int status = 0; 8845 8846 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 8847 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 8848 &task_setup_data.rpc_client, &msg); 8849 8850 dprintk("--> %s\n", __func__); 8851 if (!sync) { 8852 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 8853 if (!lrp->inode) { 8854 nfs4_layoutreturn_release(lrp); 8855 return -EAGAIN; 8856 } 8857 task_setup_data.flags |= RPC_TASK_ASYNC; 8858 } 8859 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 8860 task = rpc_run_task(&task_setup_data); 8861 if (IS_ERR(task)) 8862 return PTR_ERR(task); 8863 if (sync) 8864 status = task->tk_status; 8865 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 8866 dprintk("<-- %s status=%d\n", __func__, status); 8867 rpc_put_task(task); 8868 return status; 8869 } 8870 8871 static int 8872 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 8873 struct pnfs_device *pdev, 8874 struct rpc_cred *cred) 8875 { 8876 struct nfs4_getdeviceinfo_args args = { 8877 .pdev = pdev, 8878 .notify_types = NOTIFY_DEVICEID4_CHANGE | 8879 NOTIFY_DEVICEID4_DELETE, 8880 }; 8881 struct nfs4_getdeviceinfo_res res = { 8882 .pdev = pdev, 8883 }; 8884 struct rpc_message msg = { 8885 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 8886 .rpc_argp = &args, 8887 .rpc_resp = &res, 8888 .rpc_cred = cred, 8889 }; 8890 int status; 8891 8892 dprintk("--> %s\n", __func__); 8893 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 8894 if (res.notification & ~args.notify_types) 8895 dprintk("%s: unsupported notification\n", __func__); 8896 if (res.notification != args.notify_types) 8897 pdev->nocache = 1; 8898 8899 dprintk("<-- %s status=%d\n", __func__, status); 8900 8901 return status; 8902 } 8903 8904 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 8905 struct pnfs_device *pdev, 8906 struct rpc_cred *cred) 8907 { 8908 struct nfs4_exception exception = { }; 8909 int err; 8910 8911 do { 8912 err = nfs4_handle_exception(server, 8913 _nfs4_proc_getdeviceinfo(server, pdev, cred), 8914 &exception); 8915 } while (exception.retry); 8916 return err; 8917 } 8918 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 8919 8920 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 8921 { 8922 struct nfs4_layoutcommit_data *data = calldata; 8923 struct nfs_server *server = NFS_SERVER(data->args.inode); 8924 8925 nfs4_setup_sequence(server->nfs_client, 8926 &data->args.seq_args, 8927 &data->res.seq_res, 8928 task); 8929 } 8930 8931 static void 8932 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 8933 { 8934 struct nfs4_layoutcommit_data *data = calldata; 8935 struct nfs_server *server = NFS_SERVER(data->args.inode); 8936 8937 if (!nfs41_sequence_done(task, &data->res.seq_res)) 8938 return; 8939 8940 switch (task->tk_status) { /* Just ignore these failures */ 8941 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 8942 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 8943 case -NFS4ERR_BADLAYOUT: /* no layout */ 8944 case -NFS4ERR_GRACE: /* loca_recalim always false */ 8945 task->tk_status = 0; 8946 case 0: 8947 break; 8948 default: 8949 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 8950 rpc_restart_call_prepare(task); 8951 return; 8952 } 8953 } 8954 } 8955 8956 static void nfs4_layoutcommit_release(void *calldata) 8957 { 8958 struct nfs4_layoutcommit_data *data = calldata; 8959 8960 pnfs_cleanup_layoutcommit(data); 8961 nfs_post_op_update_inode_force_wcc(data->args.inode, 8962 data->res.fattr); 8963 put_rpccred(data->cred); 8964 nfs_iput_and_deactive(data->inode); 8965 kfree(data); 8966 } 8967 8968 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 8969 .rpc_call_prepare = nfs4_layoutcommit_prepare, 8970 .rpc_call_done = nfs4_layoutcommit_done, 8971 .rpc_release = nfs4_layoutcommit_release, 8972 }; 8973 8974 int 8975 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 8976 { 8977 struct rpc_message msg = { 8978 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 8979 .rpc_argp = &data->args, 8980 .rpc_resp = &data->res, 8981 .rpc_cred = data->cred, 8982 }; 8983 struct rpc_task_setup task_setup_data = { 8984 .task = &data->task, 8985 .rpc_client = NFS_CLIENT(data->args.inode), 8986 .rpc_message = &msg, 8987 .callback_ops = &nfs4_layoutcommit_ops, 8988 .callback_data = data, 8989 }; 8990 struct rpc_task *task; 8991 int status = 0; 8992 8993 dprintk("NFS: initiating layoutcommit call. sync %d " 8994 "lbw: %llu inode %lu\n", sync, 8995 data->args.lastbytewritten, 8996 data->args.inode->i_ino); 8997 8998 if (!sync) { 8999 data->inode = nfs_igrab_and_active(data->args.inode); 9000 if (data->inode == NULL) { 9001 nfs4_layoutcommit_release(data); 9002 return -EAGAIN; 9003 } 9004 task_setup_data.flags = RPC_TASK_ASYNC; 9005 } 9006 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 9007 task = rpc_run_task(&task_setup_data); 9008 if (IS_ERR(task)) 9009 return PTR_ERR(task); 9010 if (sync) 9011 status = task->tk_status; 9012 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 9013 dprintk("%s: status %d\n", __func__, status); 9014 rpc_put_task(task); 9015 return status; 9016 } 9017 9018 /** 9019 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 9020 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 9021 */ 9022 static int 9023 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9024 struct nfs_fsinfo *info, 9025 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 9026 { 9027 struct nfs41_secinfo_no_name_args args = { 9028 .style = SECINFO_STYLE_CURRENT_FH, 9029 }; 9030 struct nfs4_secinfo_res res = { 9031 .flavors = flavors, 9032 }; 9033 struct rpc_message msg = { 9034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 9035 .rpc_argp = &args, 9036 .rpc_resp = &res, 9037 }; 9038 struct rpc_clnt *clnt = server->client; 9039 struct rpc_cred *cred = NULL; 9040 int status; 9041 9042 if (use_integrity) { 9043 clnt = server->nfs_client->cl_rpcclient; 9044 cred = nfs4_get_clid_cred(server->nfs_client); 9045 msg.rpc_cred = cred; 9046 } 9047 9048 dprintk("--> %s\n", __func__); 9049 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 9050 &res.seq_res, 0); 9051 dprintk("<-- %s status=%d\n", __func__, status); 9052 9053 if (cred) 9054 put_rpccred(cred); 9055 9056 return status; 9057 } 9058 9059 static int 9060 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 9061 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 9062 { 9063 struct nfs4_exception exception = { }; 9064 int err; 9065 do { 9066 /* first try using integrity protection */ 9067 err = -NFS4ERR_WRONGSEC; 9068 9069 /* try to use integrity protection with machine cred */ 9070 if (_nfs4_is_integrity_protected(server->nfs_client)) 9071 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9072 flavors, true); 9073 9074 /* 9075 * if unable to use integrity protection, or SECINFO with 9076 * integrity protection returns NFS4ERR_WRONGSEC (which is 9077 * disallowed by spec, but exists in deployed servers) use 9078 * the current filesystem's rpc_client and the user cred. 9079 */ 9080 if (err == -NFS4ERR_WRONGSEC) 9081 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 9082 flavors, false); 9083 9084 switch (err) { 9085 case 0: 9086 case -NFS4ERR_WRONGSEC: 9087 case -ENOTSUPP: 9088 goto out; 9089 default: 9090 err = nfs4_handle_exception(server, err, &exception); 9091 } 9092 } while (exception.retry); 9093 out: 9094 return err; 9095 } 9096 9097 static int 9098 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 9099 struct nfs_fsinfo *info) 9100 { 9101 int err; 9102 struct page *page; 9103 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 9104 struct nfs4_secinfo_flavors *flavors; 9105 struct nfs4_secinfo4 *secinfo; 9106 int i; 9107 9108 page = alloc_page(GFP_KERNEL); 9109 if (!page) { 9110 err = -ENOMEM; 9111 goto out; 9112 } 9113 9114 flavors = page_address(page); 9115 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 9116 9117 /* 9118 * Fall back on "guess and check" method if 9119 * the server doesn't support SECINFO_NO_NAME 9120 */ 9121 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 9122 err = nfs4_find_root_sec(server, fhandle, info); 9123 goto out_freepage; 9124 } 9125 if (err) 9126 goto out_freepage; 9127 9128 for (i = 0; i < flavors->num_flavors; i++) { 9129 secinfo = &flavors->flavors[i]; 9130 9131 switch (secinfo->flavor) { 9132 case RPC_AUTH_NULL: 9133 case RPC_AUTH_UNIX: 9134 case RPC_AUTH_GSS: 9135 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 9136 &secinfo->flavor_info); 9137 break; 9138 default: 9139 flavor = RPC_AUTH_MAXFLAVOR; 9140 break; 9141 } 9142 9143 if (!nfs_auth_info_match(&server->auth_info, flavor)) 9144 flavor = RPC_AUTH_MAXFLAVOR; 9145 9146 if (flavor != RPC_AUTH_MAXFLAVOR) { 9147 err = nfs4_lookup_root_sec(server, fhandle, 9148 info, flavor); 9149 if (!err) 9150 break; 9151 } 9152 } 9153 9154 if (flavor == RPC_AUTH_MAXFLAVOR) 9155 err = -EPERM; 9156 9157 out_freepage: 9158 put_page(page); 9159 if (err == -EACCES) 9160 return -EPERM; 9161 out: 9162 return err; 9163 } 9164 9165 static int _nfs41_test_stateid(struct nfs_server *server, 9166 nfs4_stateid *stateid, 9167 struct rpc_cred *cred) 9168 { 9169 int status; 9170 struct nfs41_test_stateid_args args = { 9171 .stateid = stateid, 9172 }; 9173 struct nfs41_test_stateid_res res; 9174 struct rpc_message msg = { 9175 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 9176 .rpc_argp = &args, 9177 .rpc_resp = &res, 9178 .rpc_cred = cred, 9179 }; 9180 struct rpc_clnt *rpc_client = server->client; 9181 9182 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9183 &rpc_client, &msg); 9184 9185 dprintk("NFS call test_stateid %p\n", stateid); 9186 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 9187 nfs4_set_sequence_privileged(&args.seq_args); 9188 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 9189 &args.seq_args, &res.seq_res); 9190 if (status != NFS_OK) { 9191 dprintk("NFS reply test_stateid: failed, %d\n", status); 9192 return status; 9193 } 9194 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 9195 return -res.status; 9196 } 9197 9198 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 9199 int err, struct nfs4_exception *exception) 9200 { 9201 exception->retry = 0; 9202 switch(err) { 9203 case -NFS4ERR_DELAY: 9204 case -NFS4ERR_RETRY_UNCACHED_REP: 9205 nfs4_handle_exception(server, err, exception); 9206 break; 9207 case -NFS4ERR_BADSESSION: 9208 case -NFS4ERR_BADSLOT: 9209 case -NFS4ERR_BAD_HIGH_SLOT: 9210 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9211 case -NFS4ERR_DEADSESSION: 9212 nfs4_do_handle_exception(server, err, exception); 9213 } 9214 } 9215 9216 /** 9217 * nfs41_test_stateid - perform a TEST_STATEID operation 9218 * 9219 * @server: server / transport on which to perform the operation 9220 * @stateid: state ID to test 9221 * @cred: credential 9222 * 9223 * Returns NFS_OK if the server recognizes that "stateid" is valid. 9224 * Otherwise a negative NFS4ERR value is returned if the operation 9225 * failed or the state ID is not currently valid. 9226 */ 9227 static int nfs41_test_stateid(struct nfs_server *server, 9228 nfs4_stateid *stateid, 9229 struct rpc_cred *cred) 9230 { 9231 struct nfs4_exception exception = { }; 9232 int err; 9233 do { 9234 err = _nfs41_test_stateid(server, stateid, cred); 9235 nfs4_handle_delay_or_session_error(server, err, &exception); 9236 } while (exception.retry); 9237 return err; 9238 } 9239 9240 struct nfs_free_stateid_data { 9241 struct nfs_server *server; 9242 struct nfs41_free_stateid_args args; 9243 struct nfs41_free_stateid_res res; 9244 }; 9245 9246 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 9247 { 9248 struct nfs_free_stateid_data *data = calldata; 9249 nfs4_setup_sequence(data->server->nfs_client, 9250 &data->args.seq_args, 9251 &data->res.seq_res, 9252 task); 9253 } 9254 9255 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 9256 { 9257 struct nfs_free_stateid_data *data = calldata; 9258 9259 nfs41_sequence_done(task, &data->res.seq_res); 9260 9261 switch (task->tk_status) { 9262 case -NFS4ERR_DELAY: 9263 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 9264 rpc_restart_call_prepare(task); 9265 } 9266 } 9267 9268 static void nfs41_free_stateid_release(void *calldata) 9269 { 9270 kfree(calldata); 9271 } 9272 9273 static const struct rpc_call_ops nfs41_free_stateid_ops = { 9274 .rpc_call_prepare = nfs41_free_stateid_prepare, 9275 .rpc_call_done = nfs41_free_stateid_done, 9276 .rpc_release = nfs41_free_stateid_release, 9277 }; 9278 9279 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 9280 const nfs4_stateid *stateid, 9281 struct rpc_cred *cred, 9282 bool privileged) 9283 { 9284 struct rpc_message msg = { 9285 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 9286 .rpc_cred = cred, 9287 }; 9288 struct rpc_task_setup task_setup = { 9289 .rpc_client = server->client, 9290 .rpc_message = &msg, 9291 .callback_ops = &nfs41_free_stateid_ops, 9292 .flags = RPC_TASK_ASYNC, 9293 }; 9294 struct nfs_free_stateid_data *data; 9295 9296 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 9297 &task_setup.rpc_client, &msg); 9298 9299 dprintk("NFS call free_stateid %p\n", stateid); 9300 data = kmalloc(sizeof(*data), GFP_NOFS); 9301 if (!data) 9302 return ERR_PTR(-ENOMEM); 9303 data->server = server; 9304 nfs4_stateid_copy(&data->args.stateid, stateid); 9305 9306 task_setup.callback_data = data; 9307 9308 msg.rpc_argp = &data->args; 9309 msg.rpc_resp = &data->res; 9310 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 9311 if (privileged) 9312 nfs4_set_sequence_privileged(&data->args.seq_args); 9313 9314 return rpc_run_task(&task_setup); 9315 } 9316 9317 /** 9318 * nfs41_free_stateid - perform a FREE_STATEID operation 9319 * 9320 * @server: server / transport on which to perform the operation 9321 * @stateid: state ID to release 9322 * @cred: credential 9323 * @is_recovery: set to true if this call needs to be privileged 9324 * 9325 * Note: this function is always asynchronous. 9326 */ 9327 static int nfs41_free_stateid(struct nfs_server *server, 9328 const nfs4_stateid *stateid, 9329 struct rpc_cred *cred, 9330 bool is_recovery) 9331 { 9332 struct rpc_task *task; 9333 9334 task = _nfs41_free_stateid(server, stateid, cred, is_recovery); 9335 if (IS_ERR(task)) 9336 return PTR_ERR(task); 9337 rpc_put_task(task); 9338 return 0; 9339 } 9340 9341 static void 9342 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 9343 { 9344 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 9345 9346 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 9347 nfs4_free_lock_state(server, lsp); 9348 } 9349 9350 static bool nfs41_match_stateid(const nfs4_stateid *s1, 9351 const nfs4_stateid *s2) 9352 { 9353 if (s1->type != s2->type) 9354 return false; 9355 9356 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 9357 return false; 9358 9359 if (s1->seqid == s2->seqid) 9360 return true; 9361 9362 return s1->seqid == 0 || s2->seqid == 0; 9363 } 9364 9365 #endif /* CONFIG_NFS_V4_1 */ 9366 9367 static bool nfs4_match_stateid(const nfs4_stateid *s1, 9368 const nfs4_stateid *s2) 9369 { 9370 return nfs4_stateid_match(s1, s2); 9371 } 9372 9373 9374 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 9375 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9376 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9377 .recover_open = nfs4_open_reclaim, 9378 .recover_lock = nfs4_lock_reclaim, 9379 .establish_clid = nfs4_init_clientid, 9380 .detect_trunking = nfs40_discover_server_trunking, 9381 }; 9382 9383 #if defined(CONFIG_NFS_V4_1) 9384 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 9385 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 9386 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 9387 .recover_open = nfs4_open_reclaim, 9388 .recover_lock = nfs4_lock_reclaim, 9389 .establish_clid = nfs41_init_clientid, 9390 .reclaim_complete = nfs41_proc_reclaim_complete, 9391 .detect_trunking = nfs41_discover_server_trunking, 9392 }; 9393 #endif /* CONFIG_NFS_V4_1 */ 9394 9395 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 9396 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9397 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9398 .recover_open = nfs40_open_expired, 9399 .recover_lock = nfs4_lock_expired, 9400 .establish_clid = nfs4_init_clientid, 9401 }; 9402 9403 #if defined(CONFIG_NFS_V4_1) 9404 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 9405 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 9406 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 9407 .recover_open = nfs41_open_expired, 9408 .recover_lock = nfs41_lock_expired, 9409 .establish_clid = nfs41_init_clientid, 9410 }; 9411 #endif /* CONFIG_NFS_V4_1 */ 9412 9413 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 9414 .sched_state_renewal = nfs4_proc_async_renew, 9415 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 9416 .renew_lease = nfs4_proc_renew, 9417 }; 9418 9419 #if defined(CONFIG_NFS_V4_1) 9420 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 9421 .sched_state_renewal = nfs41_proc_async_sequence, 9422 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 9423 .renew_lease = nfs4_proc_sequence, 9424 }; 9425 #endif 9426 9427 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 9428 .get_locations = _nfs40_proc_get_locations, 9429 .fsid_present = _nfs40_proc_fsid_present, 9430 }; 9431 9432 #if defined(CONFIG_NFS_V4_1) 9433 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 9434 .get_locations = _nfs41_proc_get_locations, 9435 .fsid_present = _nfs41_proc_fsid_present, 9436 }; 9437 #endif /* CONFIG_NFS_V4_1 */ 9438 9439 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 9440 .minor_version = 0, 9441 .init_caps = NFS_CAP_READDIRPLUS 9442 | NFS_CAP_ATOMIC_OPEN 9443 | NFS_CAP_POSIX_LOCK, 9444 .init_client = nfs40_init_client, 9445 .shutdown_client = nfs40_shutdown_client, 9446 .match_stateid = nfs4_match_stateid, 9447 .find_root_sec = nfs4_find_root_sec, 9448 .free_lock_state = nfs4_release_lockowner, 9449 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 9450 .alloc_seqid = nfs_alloc_seqid, 9451 .call_sync_ops = &nfs40_call_sync_ops, 9452 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 9453 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 9454 .state_renewal_ops = &nfs40_state_renewal_ops, 9455 .mig_recovery_ops = &nfs40_mig_recovery_ops, 9456 }; 9457 9458 #if defined(CONFIG_NFS_V4_1) 9459 static struct nfs_seqid * 9460 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 9461 { 9462 return NULL; 9463 } 9464 9465 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 9466 .minor_version = 1, 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 .init_client = nfs41_init_client, 9473 .shutdown_client = nfs41_shutdown_client, 9474 .match_stateid = nfs41_match_stateid, 9475 .find_root_sec = nfs41_find_root_sec, 9476 .free_lock_state = nfs41_free_lock_state, 9477 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9478 .alloc_seqid = nfs_alloc_no_seqid, 9479 .session_trunk = nfs4_test_session_trunk, 9480 .call_sync_ops = &nfs41_call_sync_ops, 9481 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9482 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9483 .state_renewal_ops = &nfs41_state_renewal_ops, 9484 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9485 }; 9486 #endif 9487 9488 #if defined(CONFIG_NFS_V4_2) 9489 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 9490 .minor_version = 2, 9491 .init_caps = NFS_CAP_READDIRPLUS 9492 | NFS_CAP_ATOMIC_OPEN 9493 | NFS_CAP_POSIX_LOCK 9494 | NFS_CAP_STATEID_NFSV41 9495 | NFS_CAP_ATOMIC_OPEN_V1 9496 | NFS_CAP_ALLOCATE 9497 | NFS_CAP_COPY 9498 | NFS_CAP_DEALLOCATE 9499 | NFS_CAP_SEEK 9500 | NFS_CAP_LAYOUTSTATS 9501 | NFS_CAP_CLONE, 9502 .init_client = nfs41_init_client, 9503 .shutdown_client = nfs41_shutdown_client, 9504 .match_stateid = nfs41_match_stateid, 9505 .find_root_sec = nfs41_find_root_sec, 9506 .free_lock_state = nfs41_free_lock_state, 9507 .call_sync_ops = &nfs41_call_sync_ops, 9508 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 9509 .alloc_seqid = nfs_alloc_no_seqid, 9510 .session_trunk = nfs4_test_session_trunk, 9511 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 9512 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 9513 .state_renewal_ops = &nfs41_state_renewal_ops, 9514 .mig_recovery_ops = &nfs41_mig_recovery_ops, 9515 }; 9516 #endif 9517 9518 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 9519 [0] = &nfs_v4_0_minor_ops, 9520 #if defined(CONFIG_NFS_V4_1) 9521 [1] = &nfs_v4_1_minor_ops, 9522 #endif 9523 #if defined(CONFIG_NFS_V4_2) 9524 [2] = &nfs_v4_2_minor_ops, 9525 #endif 9526 }; 9527 9528 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 9529 { 9530 ssize_t error, error2; 9531 9532 error = generic_listxattr(dentry, list, size); 9533 if (error < 0) 9534 return error; 9535 if (list) { 9536 list += error; 9537 size -= error; 9538 } 9539 9540 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 9541 if (error2 < 0) 9542 return error2; 9543 return error + error2; 9544 } 9545 9546 static const struct inode_operations nfs4_dir_inode_operations = { 9547 .create = nfs_create, 9548 .lookup = nfs_lookup, 9549 .atomic_open = nfs_atomic_open, 9550 .link = nfs_link, 9551 .unlink = nfs_unlink, 9552 .symlink = nfs_symlink, 9553 .mkdir = nfs_mkdir, 9554 .rmdir = nfs_rmdir, 9555 .mknod = nfs_mknod, 9556 .rename = nfs_rename, 9557 .permission = nfs_permission, 9558 .getattr = nfs_getattr, 9559 .setattr = nfs_setattr, 9560 .listxattr = nfs4_listxattr, 9561 }; 9562 9563 static const struct inode_operations nfs4_file_inode_operations = { 9564 .permission = nfs_permission, 9565 .getattr = nfs_getattr, 9566 .setattr = nfs_setattr, 9567 .listxattr = nfs4_listxattr, 9568 }; 9569 9570 const struct nfs_rpc_ops nfs_v4_clientops = { 9571 .version = 4, /* protocol version */ 9572 .dentry_ops = &nfs4_dentry_operations, 9573 .dir_inode_ops = &nfs4_dir_inode_operations, 9574 .file_inode_ops = &nfs4_file_inode_operations, 9575 .file_ops = &nfs4_file_operations, 9576 .getroot = nfs4_proc_get_root, 9577 .submount = nfs4_submount, 9578 .try_mount = nfs4_try_mount, 9579 .getattr = nfs4_proc_getattr, 9580 .setattr = nfs4_proc_setattr, 9581 .lookup = nfs4_proc_lookup, 9582 .lookupp = nfs4_proc_lookupp, 9583 .access = nfs4_proc_access, 9584 .readlink = nfs4_proc_readlink, 9585 .create = nfs4_proc_create, 9586 .remove = nfs4_proc_remove, 9587 .unlink_setup = nfs4_proc_unlink_setup, 9588 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 9589 .unlink_done = nfs4_proc_unlink_done, 9590 .rename_setup = nfs4_proc_rename_setup, 9591 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 9592 .rename_done = nfs4_proc_rename_done, 9593 .link = nfs4_proc_link, 9594 .symlink = nfs4_proc_symlink, 9595 .mkdir = nfs4_proc_mkdir, 9596 .rmdir = nfs4_proc_remove, 9597 .readdir = nfs4_proc_readdir, 9598 .mknod = nfs4_proc_mknod, 9599 .statfs = nfs4_proc_statfs, 9600 .fsinfo = nfs4_proc_fsinfo, 9601 .pathconf = nfs4_proc_pathconf, 9602 .set_capabilities = nfs4_server_capabilities, 9603 .decode_dirent = nfs4_decode_dirent, 9604 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 9605 .read_setup = nfs4_proc_read_setup, 9606 .read_done = nfs4_read_done, 9607 .write_setup = nfs4_proc_write_setup, 9608 .write_done = nfs4_write_done, 9609 .commit_setup = nfs4_proc_commit_setup, 9610 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 9611 .commit_done = nfs4_commit_done, 9612 .lock = nfs4_proc_lock, 9613 .clear_acl_cache = nfs4_zap_acl_attr, 9614 .close_context = nfs4_close_context, 9615 .open_context = nfs4_atomic_open, 9616 .have_delegation = nfs4_have_delegation, 9617 .return_delegation = nfs4_inode_return_delegation, 9618 .alloc_client = nfs4_alloc_client, 9619 .init_client = nfs4_init_client, 9620 .free_client = nfs4_free_client, 9621 .create_server = nfs4_create_server, 9622 .clone_server = nfs_clone_server, 9623 }; 9624 9625 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 9626 .name = XATTR_NAME_NFSV4_ACL, 9627 .list = nfs4_xattr_list_nfs4_acl, 9628 .get = nfs4_xattr_get_nfs4_acl, 9629 .set = nfs4_xattr_set_nfs4_acl, 9630 }; 9631 9632 const struct xattr_handler *nfs4_xattr_handlers[] = { 9633 &nfs4_xattr_nfs4_acl_handler, 9634 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 9635 &nfs4_xattr_nfs4_label_handler, 9636 #endif 9637 NULL 9638 }; 9639 9640 /* 9641 * Local variables: 9642 * c-basic-offset: 8 9643 * End: 9644 */ 9645