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/file.h> 42 #include <linux/string.h> 43 #include <linux/ratelimit.h> 44 #include <linux/printk.h> 45 #include <linux/slab.h> 46 #include <linux/sunrpc/clnt.h> 47 #include <linux/nfs.h> 48 #include <linux/nfs4.h> 49 #include <linux/nfs_fs.h> 50 #include <linux/nfs_page.h> 51 #include <linux/nfs_mount.h> 52 #include <linux/namei.h> 53 #include <linux/mount.h> 54 #include <linux/module.h> 55 #include <linux/xattr.h> 56 #include <linux/utsname.h> 57 #include <linux/freezer.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 nfs4_state *state, struct nfs4_label *ilabel, 98 struct nfs4_label *olabel); 99 #ifdef CONFIG_NFS_V4_1 100 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 101 struct rpc_cred *); 102 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *, 103 struct rpc_cred *); 104 #endif 105 106 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 107 static inline struct nfs4_label * 108 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 109 struct iattr *sattr, struct nfs4_label *label) 110 { 111 int err; 112 113 if (label == NULL) 114 return NULL; 115 116 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 117 return NULL; 118 119 err = security_dentry_init_security(dentry, sattr->ia_mode, 120 &dentry->d_name, (void **)&label->label, &label->len); 121 if (err == 0) 122 return label; 123 124 return NULL; 125 } 126 static inline void 127 nfs4_label_release_security(struct nfs4_label *label) 128 { 129 if (label) 130 security_release_secctx(label->label, label->len); 131 } 132 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 133 { 134 if (label) 135 return server->attr_bitmask; 136 137 return server->attr_bitmask_nl; 138 } 139 #else 140 static inline struct nfs4_label * 141 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 142 struct iattr *sattr, struct nfs4_label *l) 143 { return NULL; } 144 static inline void 145 nfs4_label_release_security(struct nfs4_label *label) 146 { return; } 147 static inline u32 * 148 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 149 { return server->attr_bitmask; } 150 #endif 151 152 /* Prevent leaks of NFSv4 errors into userland */ 153 static int nfs4_map_errors(int err) 154 { 155 if (err >= -1000) 156 return err; 157 switch (err) { 158 case -NFS4ERR_RESOURCE: 159 case -NFS4ERR_LAYOUTTRYLATER: 160 case -NFS4ERR_RECALLCONFLICT: 161 return -EREMOTEIO; 162 case -NFS4ERR_WRONGSEC: 163 case -NFS4ERR_WRONG_CRED: 164 return -EPERM; 165 case -NFS4ERR_BADOWNER: 166 case -NFS4ERR_BADNAME: 167 return -EINVAL; 168 case -NFS4ERR_SHARE_DENIED: 169 return -EACCES; 170 case -NFS4ERR_MINOR_VERS_MISMATCH: 171 return -EPROTONOSUPPORT; 172 case -NFS4ERR_FILE_OPEN: 173 return -EBUSY; 174 default: 175 dprintk("%s could not handle NFSv4 error %d\n", 176 __func__, -err); 177 break; 178 } 179 return -EIO; 180 } 181 182 /* 183 * This is our standard bitmap for GETATTR requests. 184 */ 185 const u32 nfs4_fattr_bitmap[3] = { 186 FATTR4_WORD0_TYPE 187 | FATTR4_WORD0_CHANGE 188 | FATTR4_WORD0_SIZE 189 | FATTR4_WORD0_FSID 190 | FATTR4_WORD0_FILEID, 191 FATTR4_WORD1_MODE 192 | FATTR4_WORD1_NUMLINKS 193 | FATTR4_WORD1_OWNER 194 | FATTR4_WORD1_OWNER_GROUP 195 | FATTR4_WORD1_RAWDEV 196 | FATTR4_WORD1_SPACE_USED 197 | FATTR4_WORD1_TIME_ACCESS 198 | FATTR4_WORD1_TIME_METADATA 199 | FATTR4_WORD1_TIME_MODIFY 200 | FATTR4_WORD1_MOUNTED_ON_FILEID, 201 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 202 FATTR4_WORD2_SECURITY_LABEL 203 #endif 204 }; 205 206 static const u32 nfs4_pnfs_open_bitmap[3] = { 207 FATTR4_WORD0_TYPE 208 | FATTR4_WORD0_CHANGE 209 | FATTR4_WORD0_SIZE 210 | FATTR4_WORD0_FSID 211 | FATTR4_WORD0_FILEID, 212 FATTR4_WORD1_MODE 213 | FATTR4_WORD1_NUMLINKS 214 | FATTR4_WORD1_OWNER 215 | FATTR4_WORD1_OWNER_GROUP 216 | FATTR4_WORD1_RAWDEV 217 | FATTR4_WORD1_SPACE_USED 218 | FATTR4_WORD1_TIME_ACCESS 219 | FATTR4_WORD1_TIME_METADATA 220 | FATTR4_WORD1_TIME_MODIFY, 221 FATTR4_WORD2_MDSTHRESHOLD 222 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 223 | FATTR4_WORD2_SECURITY_LABEL 224 #endif 225 }; 226 227 static const u32 nfs4_open_noattr_bitmap[3] = { 228 FATTR4_WORD0_TYPE 229 | FATTR4_WORD0_CHANGE 230 | FATTR4_WORD0_FILEID, 231 }; 232 233 const u32 nfs4_statfs_bitmap[3] = { 234 FATTR4_WORD0_FILES_AVAIL 235 | FATTR4_WORD0_FILES_FREE 236 | FATTR4_WORD0_FILES_TOTAL, 237 FATTR4_WORD1_SPACE_AVAIL 238 | FATTR4_WORD1_SPACE_FREE 239 | FATTR4_WORD1_SPACE_TOTAL 240 }; 241 242 const u32 nfs4_pathconf_bitmap[3] = { 243 FATTR4_WORD0_MAXLINK 244 | FATTR4_WORD0_MAXNAME, 245 0 246 }; 247 248 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 249 | FATTR4_WORD0_MAXREAD 250 | FATTR4_WORD0_MAXWRITE 251 | FATTR4_WORD0_LEASE_TIME, 252 FATTR4_WORD1_TIME_DELTA 253 | FATTR4_WORD1_FS_LAYOUT_TYPES, 254 FATTR4_WORD2_LAYOUT_BLKSIZE 255 | FATTR4_WORD2_CLONE_BLKSIZE 256 }; 257 258 const u32 nfs4_fs_locations_bitmap[3] = { 259 FATTR4_WORD0_TYPE 260 | FATTR4_WORD0_CHANGE 261 | FATTR4_WORD0_SIZE 262 | FATTR4_WORD0_FSID 263 | FATTR4_WORD0_FILEID 264 | FATTR4_WORD0_FS_LOCATIONS, 265 FATTR4_WORD1_MODE 266 | FATTR4_WORD1_NUMLINKS 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 __be32 *start, *p; 281 282 if (cookie > 2) { 283 readdir->cookie = cookie; 284 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 285 return; 286 } 287 288 readdir->cookie = 0; 289 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 290 if (cookie == 2) 291 return; 292 293 /* 294 * NFSv4 servers do not return entries for '.' and '..' 295 * Therefore, we fake these entries here. We let '.' 296 * have cookie 0 and '..' have cookie 1. Note that 297 * when talking to the server, we always send cookie 0 298 * instead of 1 or 2. 299 */ 300 start = p = kmap_atomic(*readdir->pages); 301 302 if (cookie == 0) { 303 *p++ = xdr_one; /* next */ 304 *p++ = xdr_zero; /* cookie, first word */ 305 *p++ = xdr_one; /* cookie, second word */ 306 *p++ = xdr_one; /* entry len */ 307 memcpy(p, ".\0\0\0", 4); /* entry */ 308 p++; 309 *p++ = xdr_one; /* bitmap length */ 310 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 311 *p++ = htonl(8); /* attribute buffer length */ 312 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 313 } 314 315 *p++ = xdr_one; /* next */ 316 *p++ = xdr_zero; /* cookie, first word */ 317 *p++ = xdr_two; /* cookie, second word */ 318 *p++ = xdr_two; /* entry len */ 319 memcpy(p, "..\0\0", 4); /* entry */ 320 p++; 321 *p++ = xdr_one; /* bitmap length */ 322 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 323 *p++ = htonl(8); /* attribute buffer length */ 324 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 325 326 readdir->pgbase = (char *)p - (char *)start; 327 readdir->count -= readdir->pgbase; 328 kunmap_atomic(start); 329 } 330 331 static long nfs4_update_delay(long *timeout) 332 { 333 long ret; 334 if (!timeout) 335 return NFS4_POLL_RETRY_MAX; 336 if (*timeout <= 0) 337 *timeout = NFS4_POLL_RETRY_MIN; 338 if (*timeout > NFS4_POLL_RETRY_MAX) 339 *timeout = NFS4_POLL_RETRY_MAX; 340 ret = *timeout; 341 *timeout <<= 1; 342 return ret; 343 } 344 345 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 346 { 347 int res = 0; 348 349 might_sleep(); 350 351 freezable_schedule_timeout_killable_unsafe( 352 nfs4_update_delay(timeout)); 353 if (fatal_signal_pending(current)) 354 res = -ERESTARTSYS; 355 return res; 356 } 357 358 /* This is the error handling routine for processes that are allowed 359 * to sleep. 360 */ 361 static int nfs4_do_handle_exception(struct nfs_server *server, 362 int errorcode, struct nfs4_exception *exception) 363 { 364 struct nfs_client *clp = server->nfs_client; 365 struct nfs4_state *state = exception->state; 366 const nfs4_stateid *stateid = exception->stateid; 367 struct inode *inode = exception->inode; 368 int ret = errorcode; 369 370 exception->delay = 0; 371 exception->recovering = 0; 372 exception->retry = 0; 373 switch(errorcode) { 374 case 0: 375 return 0; 376 case -NFS4ERR_OPENMODE: 377 case -NFS4ERR_DELEG_REVOKED: 378 case -NFS4ERR_ADMIN_REVOKED: 379 case -NFS4ERR_BAD_STATEID: 380 if (inode) { 381 int err; 382 383 err = nfs_async_inode_return_delegation(inode, 384 stateid); 385 if (err == 0) 386 goto wait_on_recovery; 387 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 388 exception->retry = 1; 389 break; 390 } 391 } 392 if (state == NULL) 393 break; 394 ret = nfs4_schedule_stateid_recovery(server, state); 395 if (ret < 0) 396 break; 397 goto wait_on_recovery; 398 case -NFS4ERR_EXPIRED: 399 if (state != NULL) { 400 ret = nfs4_schedule_stateid_recovery(server, state); 401 if (ret < 0) 402 break; 403 } 404 case -NFS4ERR_STALE_STATEID: 405 case -NFS4ERR_STALE_CLIENTID: 406 nfs4_schedule_lease_recovery(clp); 407 goto wait_on_recovery; 408 case -NFS4ERR_MOVED: 409 ret = nfs4_schedule_migration_recovery(server); 410 if (ret < 0) 411 break; 412 goto wait_on_recovery; 413 case -NFS4ERR_LEASE_MOVED: 414 nfs4_schedule_lease_moved_recovery(clp); 415 goto wait_on_recovery; 416 #if defined(CONFIG_NFS_V4_1) 417 case -NFS4ERR_BADSESSION: 418 case -NFS4ERR_BADSLOT: 419 case -NFS4ERR_BAD_HIGH_SLOT: 420 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 421 case -NFS4ERR_DEADSESSION: 422 case -NFS4ERR_SEQ_FALSE_RETRY: 423 case -NFS4ERR_SEQ_MISORDERED: 424 dprintk("%s ERROR: %d Reset session\n", __func__, 425 errorcode); 426 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 427 goto wait_on_recovery; 428 #endif /* defined(CONFIG_NFS_V4_1) */ 429 case -NFS4ERR_FILE_OPEN: 430 if (exception->timeout > HZ) { 431 /* We have retried a decent amount, time to 432 * fail 433 */ 434 ret = -EBUSY; 435 break; 436 } 437 case -NFS4ERR_DELAY: 438 nfs_inc_server_stats(server, NFSIOS_DELAY); 439 case -NFS4ERR_GRACE: 440 case -NFS4ERR_LAYOUTTRYLATER: 441 case -NFS4ERR_RECALLCONFLICT: 442 exception->delay = 1; 443 return 0; 444 445 case -NFS4ERR_RETRY_UNCACHED_REP: 446 case -NFS4ERR_OLD_STATEID: 447 exception->retry = 1; 448 break; 449 case -NFS4ERR_BADOWNER: 450 /* The following works around a Linux server bug! */ 451 case -NFS4ERR_BADNAME: 452 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 453 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 454 exception->retry = 1; 455 printk(KERN_WARNING "NFS: v4 server %s " 456 "does not accept raw " 457 "uid/gids. " 458 "Reenabling the idmapper.\n", 459 server->nfs_client->cl_hostname); 460 } 461 } 462 /* We failed to handle the error */ 463 return nfs4_map_errors(ret); 464 wait_on_recovery: 465 exception->recovering = 1; 466 return 0; 467 } 468 469 /* This is the error handling routine for processes that are allowed 470 * to sleep. 471 */ 472 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 473 { 474 struct nfs_client *clp = server->nfs_client; 475 int ret; 476 477 ret = nfs4_do_handle_exception(server, errorcode, exception); 478 if (exception->delay) { 479 ret = nfs4_delay(server->client, &exception->timeout); 480 goto out_retry; 481 } 482 if (exception->recovering) { 483 ret = nfs4_wait_clnt_recover(clp); 484 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 485 return -EIO; 486 goto out_retry; 487 } 488 return ret; 489 out_retry: 490 if (ret == 0) 491 exception->retry = 1; 492 return ret; 493 } 494 495 static int 496 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 497 int errorcode, struct nfs4_exception *exception) 498 { 499 struct nfs_client *clp = server->nfs_client; 500 int ret; 501 502 ret = nfs4_do_handle_exception(server, errorcode, exception); 503 if (exception->delay) { 504 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 505 goto out_retry; 506 } 507 if (exception->recovering) { 508 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 509 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 510 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 511 goto out_retry; 512 } 513 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 514 ret = -EIO; 515 return ret; 516 out_retry: 517 if (ret == 0) 518 exception->retry = 1; 519 return ret; 520 } 521 522 static int 523 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 524 struct nfs4_state *state, long *timeout) 525 { 526 struct nfs4_exception exception = { 527 .state = state, 528 }; 529 530 if (task->tk_status >= 0) 531 return 0; 532 if (timeout) 533 exception.timeout = *timeout; 534 task->tk_status = nfs4_async_handle_exception(task, server, 535 task->tk_status, 536 &exception); 537 if (exception.delay && timeout) 538 *timeout = exception.timeout; 539 if (exception.retry) 540 return -EAGAIN; 541 return 0; 542 } 543 544 /* 545 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 546 * or 'false' otherwise. 547 */ 548 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 549 { 550 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 551 552 if (flavor == RPC_AUTH_GSS_KRB5I || 553 flavor == RPC_AUTH_GSS_KRB5P) 554 return true; 555 556 return false; 557 } 558 559 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 560 { 561 spin_lock(&clp->cl_lock); 562 if (time_before(clp->cl_last_renewal,timestamp)) 563 clp->cl_last_renewal = timestamp; 564 spin_unlock(&clp->cl_lock); 565 } 566 567 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 568 { 569 struct nfs_client *clp = server->nfs_client; 570 571 if (!nfs4_has_session(clp)) 572 do_renew_lease(clp, timestamp); 573 } 574 575 struct nfs4_call_sync_data { 576 const struct nfs_server *seq_server; 577 struct nfs4_sequence_args *seq_args; 578 struct nfs4_sequence_res *seq_res; 579 }; 580 581 void nfs4_init_sequence(struct nfs4_sequence_args *args, 582 struct nfs4_sequence_res *res, int cache_reply) 583 { 584 args->sa_slot = NULL; 585 args->sa_cache_this = cache_reply; 586 args->sa_privileged = 0; 587 588 res->sr_slot = NULL; 589 } 590 591 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 592 { 593 args->sa_privileged = 1; 594 } 595 596 int nfs40_setup_sequence(struct nfs4_slot_table *tbl, 597 struct nfs4_sequence_args *args, 598 struct nfs4_sequence_res *res, 599 struct rpc_task *task) 600 { 601 struct nfs4_slot *slot; 602 603 /* slot already allocated? */ 604 if (res->sr_slot != NULL) 605 goto out_start; 606 607 spin_lock(&tbl->slot_tbl_lock); 608 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 609 goto out_sleep; 610 611 slot = nfs4_alloc_slot(tbl); 612 if (IS_ERR(slot)) { 613 if (slot == ERR_PTR(-ENOMEM)) 614 task->tk_timeout = HZ >> 2; 615 goto out_sleep; 616 } 617 spin_unlock(&tbl->slot_tbl_lock); 618 619 args->sa_slot = slot; 620 res->sr_slot = slot; 621 622 out_start: 623 rpc_call_start(task); 624 return 0; 625 626 out_sleep: 627 if (args->sa_privileged) 628 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 629 NULL, RPC_PRIORITY_PRIVILEGED); 630 else 631 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 632 spin_unlock(&tbl->slot_tbl_lock); 633 return -EAGAIN; 634 } 635 EXPORT_SYMBOL_GPL(nfs40_setup_sequence); 636 637 static int nfs40_sequence_done(struct rpc_task *task, 638 struct nfs4_sequence_res *res) 639 { 640 struct nfs4_slot *slot = res->sr_slot; 641 struct nfs4_slot_table *tbl; 642 643 if (slot == NULL) 644 goto out; 645 646 tbl = slot->table; 647 spin_lock(&tbl->slot_tbl_lock); 648 if (!nfs41_wake_and_assign_slot(tbl, slot)) 649 nfs4_free_slot(tbl, slot); 650 spin_unlock(&tbl->slot_tbl_lock); 651 652 res->sr_slot = NULL; 653 out: 654 return 1; 655 } 656 657 #if defined(CONFIG_NFS_V4_1) 658 659 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 660 { 661 struct nfs4_session *session; 662 struct nfs4_slot_table *tbl; 663 struct nfs4_slot *slot = res->sr_slot; 664 bool send_new_highest_used_slotid = false; 665 666 tbl = slot->table; 667 session = tbl->session; 668 669 spin_lock(&tbl->slot_tbl_lock); 670 /* Be nice to the server: try to ensure that the last transmitted 671 * value for highest_user_slotid <= target_highest_slotid 672 */ 673 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 674 send_new_highest_used_slotid = true; 675 676 if (nfs41_wake_and_assign_slot(tbl, slot)) { 677 send_new_highest_used_slotid = false; 678 goto out_unlock; 679 } 680 nfs4_free_slot(tbl, slot); 681 682 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 683 send_new_highest_used_slotid = false; 684 out_unlock: 685 spin_unlock(&tbl->slot_tbl_lock); 686 res->sr_slot = NULL; 687 if (send_new_highest_used_slotid) 688 nfs41_notify_server(session->clp); 689 } 690 691 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 692 { 693 struct nfs4_session *session; 694 struct nfs4_slot *slot = res->sr_slot; 695 struct nfs_client *clp; 696 bool interrupted = false; 697 int ret = 1; 698 699 if (slot == NULL) 700 goto out_noaction; 701 /* don't increment the sequence number if the task wasn't sent */ 702 if (!RPC_WAS_SENT(task)) 703 goto out; 704 705 session = slot->table->session; 706 707 if (slot->interrupted) { 708 slot->interrupted = 0; 709 interrupted = true; 710 } 711 712 trace_nfs4_sequence_done(session, res); 713 /* Check the SEQUENCE operation status */ 714 switch (res->sr_status) { 715 case 0: 716 /* Update the slot's sequence and clientid lease timer */ 717 ++slot->seq_nr; 718 clp = session->clp; 719 do_renew_lease(clp, res->sr_timestamp); 720 /* Check sequence flags */ 721 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 722 nfs41_update_target_slotid(slot->table, slot, res); 723 break; 724 case 1: 725 /* 726 * sr_status remains 1 if an RPC level error occurred. 727 * The server may or may not have processed the sequence 728 * operation.. 729 * Mark the slot as having hosted an interrupted RPC call. 730 */ 731 slot->interrupted = 1; 732 goto out; 733 case -NFS4ERR_DELAY: 734 /* The server detected a resend of the RPC call and 735 * returned NFS4ERR_DELAY as per Section 2.10.6.2 736 * of RFC5661. 737 */ 738 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 739 __func__, 740 slot->slot_nr, 741 slot->seq_nr); 742 goto out_retry; 743 case -NFS4ERR_BADSLOT: 744 /* 745 * The slot id we used was probably retired. Try again 746 * using a different slot id. 747 */ 748 goto retry_nowait; 749 case -NFS4ERR_SEQ_MISORDERED: 750 /* 751 * Was the last operation on this sequence interrupted? 752 * If so, retry after bumping the sequence number. 753 */ 754 if (interrupted) { 755 ++slot->seq_nr; 756 goto retry_nowait; 757 } 758 /* 759 * Could this slot have been previously retired? 760 * If so, then the server may be expecting seq_nr = 1! 761 */ 762 if (slot->seq_nr != 1) { 763 slot->seq_nr = 1; 764 goto retry_nowait; 765 } 766 break; 767 case -NFS4ERR_SEQ_FALSE_RETRY: 768 ++slot->seq_nr; 769 goto retry_nowait; 770 default: 771 /* Just update the slot sequence no. */ 772 ++slot->seq_nr; 773 } 774 out: 775 /* The session may be reset by one of the error handlers. */ 776 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 777 nfs41_sequence_free_slot(res); 778 out_noaction: 779 return ret; 780 retry_nowait: 781 if (rpc_restart_call_prepare(task)) { 782 task->tk_status = 0; 783 ret = 0; 784 } 785 goto out; 786 out_retry: 787 if (!rpc_restart_call(task)) 788 goto out; 789 rpc_delay(task, NFS4_POLL_RETRY_MAX); 790 return 0; 791 } 792 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 793 794 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 795 { 796 if (res->sr_slot == NULL) 797 return 1; 798 if (!res->sr_slot->table->session) 799 return nfs40_sequence_done(task, res); 800 return nfs41_sequence_done(task, res); 801 } 802 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 803 804 int nfs41_setup_sequence(struct nfs4_session *session, 805 struct nfs4_sequence_args *args, 806 struct nfs4_sequence_res *res, 807 struct rpc_task *task) 808 { 809 struct nfs4_slot *slot; 810 struct nfs4_slot_table *tbl; 811 812 dprintk("--> %s\n", __func__); 813 /* slot already allocated? */ 814 if (res->sr_slot != NULL) 815 goto out_success; 816 817 tbl = &session->fc_slot_table; 818 819 task->tk_timeout = 0; 820 821 spin_lock(&tbl->slot_tbl_lock); 822 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) && 823 !args->sa_privileged) { 824 /* The state manager will wait until the slot table is empty */ 825 dprintk("%s session is draining\n", __func__); 826 goto out_sleep; 827 } 828 829 slot = nfs4_alloc_slot(tbl); 830 if (IS_ERR(slot)) { 831 /* If out of memory, try again in 1/4 second */ 832 if (slot == ERR_PTR(-ENOMEM)) 833 task->tk_timeout = HZ >> 2; 834 dprintk("<-- %s: no free slots\n", __func__); 835 goto out_sleep; 836 } 837 spin_unlock(&tbl->slot_tbl_lock); 838 839 args->sa_slot = slot; 840 841 dprintk("<-- %s slotid=%u seqid=%u\n", __func__, 842 slot->slot_nr, slot->seq_nr); 843 844 res->sr_slot = slot; 845 res->sr_timestamp = jiffies; 846 res->sr_status_flags = 0; 847 /* 848 * sr_status is only set in decode_sequence, and so will remain 849 * set to 1 if an rpc level failure occurs. 850 */ 851 res->sr_status = 1; 852 trace_nfs4_setup_sequence(session, args); 853 out_success: 854 rpc_call_start(task); 855 return 0; 856 out_sleep: 857 /* Privileged tasks are queued with top priority */ 858 if (args->sa_privileged) 859 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 860 NULL, RPC_PRIORITY_PRIVILEGED); 861 else 862 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 863 spin_unlock(&tbl->slot_tbl_lock); 864 return -EAGAIN; 865 } 866 EXPORT_SYMBOL_GPL(nfs41_setup_sequence); 867 868 static int nfs4_setup_sequence(const struct nfs_server *server, 869 struct nfs4_sequence_args *args, 870 struct nfs4_sequence_res *res, 871 struct rpc_task *task) 872 { 873 struct nfs4_session *session = nfs4_get_session(server); 874 int ret = 0; 875 876 if (!session) 877 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl, 878 args, res, task); 879 880 dprintk("--> %s clp %p session %p sr_slot %u\n", 881 __func__, session->clp, session, res->sr_slot ? 882 res->sr_slot->slot_nr : NFS4_NO_SLOT); 883 884 ret = nfs41_setup_sequence(session, args, res, task); 885 886 dprintk("<-- %s status=%d\n", __func__, ret); 887 return ret; 888 } 889 890 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 891 { 892 struct nfs4_call_sync_data *data = calldata; 893 struct nfs4_session *session = nfs4_get_session(data->seq_server); 894 895 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 896 897 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task); 898 } 899 900 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 901 { 902 struct nfs4_call_sync_data *data = calldata; 903 904 nfs41_sequence_done(task, data->seq_res); 905 } 906 907 static const struct rpc_call_ops nfs41_call_sync_ops = { 908 .rpc_call_prepare = nfs41_call_sync_prepare, 909 .rpc_call_done = nfs41_call_sync_done, 910 }; 911 912 #else /* !CONFIG_NFS_V4_1 */ 913 914 static int nfs4_setup_sequence(const struct nfs_server *server, 915 struct nfs4_sequence_args *args, 916 struct nfs4_sequence_res *res, 917 struct rpc_task *task) 918 { 919 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl, 920 args, res, task); 921 } 922 923 int nfs4_sequence_done(struct rpc_task *task, 924 struct nfs4_sequence_res *res) 925 { 926 return nfs40_sequence_done(task, res); 927 } 928 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 929 930 #endif /* !CONFIG_NFS_V4_1 */ 931 932 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 933 { 934 struct nfs4_call_sync_data *data = calldata; 935 nfs4_setup_sequence(data->seq_server, 936 data->seq_args, data->seq_res, task); 937 } 938 939 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 940 { 941 struct nfs4_call_sync_data *data = calldata; 942 nfs4_sequence_done(task, data->seq_res); 943 } 944 945 static const struct rpc_call_ops nfs40_call_sync_ops = { 946 .rpc_call_prepare = nfs40_call_sync_prepare, 947 .rpc_call_done = nfs40_call_sync_done, 948 }; 949 950 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 951 struct nfs_server *server, 952 struct rpc_message *msg, 953 struct nfs4_sequence_args *args, 954 struct nfs4_sequence_res *res) 955 { 956 int ret; 957 struct rpc_task *task; 958 struct nfs_client *clp = server->nfs_client; 959 struct nfs4_call_sync_data data = { 960 .seq_server = server, 961 .seq_args = args, 962 .seq_res = res, 963 }; 964 struct rpc_task_setup task_setup = { 965 .rpc_client = clnt, 966 .rpc_message = msg, 967 .callback_ops = clp->cl_mvops->call_sync_ops, 968 .callback_data = &data 969 }; 970 971 task = rpc_run_task(&task_setup); 972 if (IS_ERR(task)) 973 ret = PTR_ERR(task); 974 else { 975 ret = task->tk_status; 976 rpc_put_task(task); 977 } 978 return ret; 979 } 980 981 int nfs4_call_sync(struct rpc_clnt *clnt, 982 struct nfs_server *server, 983 struct rpc_message *msg, 984 struct nfs4_sequence_args *args, 985 struct nfs4_sequence_res *res, 986 int cache_reply) 987 { 988 nfs4_init_sequence(args, res, cache_reply); 989 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 990 } 991 992 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 993 { 994 struct nfs_inode *nfsi = NFS_I(dir); 995 996 spin_lock(&dir->i_lock); 997 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 998 if (!cinfo->atomic || cinfo->before != dir->i_version) 999 nfs_force_lookup_revalidate(dir); 1000 dir->i_version = cinfo->after; 1001 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1002 nfs_fscache_invalidate(dir); 1003 spin_unlock(&dir->i_lock); 1004 } 1005 1006 struct nfs4_opendata { 1007 struct kref kref; 1008 struct nfs_openargs o_arg; 1009 struct nfs_openres o_res; 1010 struct nfs_open_confirmargs c_arg; 1011 struct nfs_open_confirmres c_res; 1012 struct nfs4_string owner_name; 1013 struct nfs4_string group_name; 1014 struct nfs4_label *a_label; 1015 struct nfs_fattr f_attr; 1016 struct nfs4_label *f_label; 1017 struct dentry *dir; 1018 struct dentry *dentry; 1019 struct nfs4_state_owner *owner; 1020 struct nfs4_state *state; 1021 struct iattr attrs; 1022 unsigned long timestamp; 1023 unsigned int rpc_done : 1; 1024 unsigned int file_created : 1; 1025 unsigned int is_recover : 1; 1026 int rpc_status; 1027 int cancelled; 1028 }; 1029 1030 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1031 int err, struct nfs4_exception *exception) 1032 { 1033 if (err != -EINVAL) 1034 return false; 1035 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1036 return false; 1037 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1038 exception->retry = 1; 1039 return true; 1040 } 1041 1042 static u32 1043 nfs4_map_atomic_open_share(struct nfs_server *server, 1044 fmode_t fmode, int openflags) 1045 { 1046 u32 res = 0; 1047 1048 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1049 case FMODE_READ: 1050 res = NFS4_SHARE_ACCESS_READ; 1051 break; 1052 case FMODE_WRITE: 1053 res = NFS4_SHARE_ACCESS_WRITE; 1054 break; 1055 case FMODE_READ|FMODE_WRITE: 1056 res = NFS4_SHARE_ACCESS_BOTH; 1057 } 1058 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1059 goto out; 1060 /* Want no delegation if we're using O_DIRECT */ 1061 if (openflags & O_DIRECT) 1062 res |= NFS4_SHARE_WANT_NO_DELEG; 1063 out: 1064 return res; 1065 } 1066 1067 static enum open_claim_type4 1068 nfs4_map_atomic_open_claim(struct nfs_server *server, 1069 enum open_claim_type4 claim) 1070 { 1071 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1072 return claim; 1073 switch (claim) { 1074 default: 1075 return claim; 1076 case NFS4_OPEN_CLAIM_FH: 1077 return NFS4_OPEN_CLAIM_NULL; 1078 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1079 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1080 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1081 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1082 } 1083 } 1084 1085 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1086 { 1087 p->o_res.f_attr = &p->f_attr; 1088 p->o_res.f_label = p->f_label; 1089 p->o_res.seqid = p->o_arg.seqid; 1090 p->c_res.seqid = p->c_arg.seqid; 1091 p->o_res.server = p->o_arg.server; 1092 p->o_res.access_request = p->o_arg.access; 1093 nfs_fattr_init(&p->f_attr); 1094 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1095 } 1096 1097 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1098 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1099 const struct iattr *attrs, 1100 struct nfs4_label *label, 1101 enum open_claim_type4 claim, 1102 gfp_t gfp_mask) 1103 { 1104 struct dentry *parent = dget_parent(dentry); 1105 struct inode *dir = d_inode(parent); 1106 struct nfs_server *server = NFS_SERVER(dir); 1107 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1108 struct nfs4_opendata *p; 1109 1110 p = kzalloc(sizeof(*p), gfp_mask); 1111 if (p == NULL) 1112 goto err; 1113 1114 p->f_label = nfs4_label_alloc(server, gfp_mask); 1115 if (IS_ERR(p->f_label)) 1116 goto err_free_p; 1117 1118 p->a_label = nfs4_label_alloc(server, gfp_mask); 1119 if (IS_ERR(p->a_label)) 1120 goto err_free_f; 1121 1122 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1123 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1124 if (IS_ERR(p->o_arg.seqid)) 1125 goto err_free_label; 1126 nfs_sb_active(dentry->d_sb); 1127 p->dentry = dget(dentry); 1128 p->dir = parent; 1129 p->owner = sp; 1130 atomic_inc(&sp->so_count); 1131 p->o_arg.open_flags = flags; 1132 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1133 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1134 fmode, flags); 1135 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1136 * will return permission denied for all bits until close */ 1137 if (!(flags & O_EXCL)) { 1138 /* ask server to check for all possible rights as results 1139 * are cached */ 1140 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1141 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE; 1142 } 1143 p->o_arg.clientid = server->nfs_client->cl_clientid; 1144 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1145 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1146 p->o_arg.name = &dentry->d_name; 1147 p->o_arg.server = server; 1148 p->o_arg.bitmask = nfs4_bitmask(server, label); 1149 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1150 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1151 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1152 switch (p->o_arg.claim) { 1153 case NFS4_OPEN_CLAIM_NULL: 1154 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1155 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1156 p->o_arg.fh = NFS_FH(dir); 1157 break; 1158 case NFS4_OPEN_CLAIM_PREVIOUS: 1159 case NFS4_OPEN_CLAIM_FH: 1160 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1161 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1162 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1163 } 1164 if (attrs != NULL && attrs->ia_valid != 0) { 1165 __u32 verf[2]; 1166 1167 p->o_arg.u.attrs = &p->attrs; 1168 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 1169 1170 verf[0] = jiffies; 1171 verf[1] = current->pid; 1172 memcpy(p->o_arg.u.verifier.data, verf, 1173 sizeof(p->o_arg.u.verifier.data)); 1174 } 1175 p->c_arg.fh = &p->o_res.fh; 1176 p->c_arg.stateid = &p->o_res.stateid; 1177 p->c_arg.seqid = p->o_arg.seqid; 1178 nfs4_init_opendata_res(p); 1179 kref_init(&p->kref); 1180 return p; 1181 1182 err_free_label: 1183 nfs4_label_free(p->a_label); 1184 err_free_f: 1185 nfs4_label_free(p->f_label); 1186 err_free_p: 1187 kfree(p); 1188 err: 1189 dput(parent); 1190 return NULL; 1191 } 1192 1193 static void nfs4_opendata_free(struct kref *kref) 1194 { 1195 struct nfs4_opendata *p = container_of(kref, 1196 struct nfs4_opendata, kref); 1197 struct super_block *sb = p->dentry->d_sb; 1198 1199 nfs_free_seqid(p->o_arg.seqid); 1200 if (p->state != NULL) 1201 nfs4_put_open_state(p->state); 1202 nfs4_put_state_owner(p->owner); 1203 1204 nfs4_label_free(p->a_label); 1205 nfs4_label_free(p->f_label); 1206 1207 dput(p->dir); 1208 dput(p->dentry); 1209 nfs_sb_deactive(sb); 1210 nfs_fattr_free_names(&p->f_attr); 1211 kfree(p->f_attr.mdsthreshold); 1212 kfree(p); 1213 } 1214 1215 static void nfs4_opendata_put(struct nfs4_opendata *p) 1216 { 1217 if (p != NULL) 1218 kref_put(&p->kref, nfs4_opendata_free); 1219 } 1220 1221 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 1222 { 1223 int ret; 1224 1225 ret = rpc_wait_for_completion_task(task); 1226 return ret; 1227 } 1228 1229 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1230 fmode_t fmode) 1231 { 1232 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1233 case FMODE_READ|FMODE_WRITE: 1234 return state->n_rdwr != 0; 1235 case FMODE_WRITE: 1236 return state->n_wronly != 0; 1237 case FMODE_READ: 1238 return state->n_rdonly != 0; 1239 } 1240 WARN_ON_ONCE(1); 1241 return false; 1242 } 1243 1244 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1245 { 1246 int ret = 0; 1247 1248 if (open_mode & (O_EXCL|O_TRUNC)) 1249 goto out; 1250 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1251 case FMODE_READ: 1252 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1253 && state->n_rdonly != 0; 1254 break; 1255 case FMODE_WRITE: 1256 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1257 && state->n_wronly != 0; 1258 break; 1259 case FMODE_READ|FMODE_WRITE: 1260 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1261 && state->n_rdwr != 0; 1262 } 1263 out: 1264 return ret; 1265 } 1266 1267 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1268 enum open_claim_type4 claim) 1269 { 1270 if (delegation == NULL) 1271 return 0; 1272 if ((delegation->type & fmode) != fmode) 1273 return 0; 1274 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1275 return 0; 1276 switch (claim) { 1277 case NFS4_OPEN_CLAIM_NULL: 1278 case NFS4_OPEN_CLAIM_FH: 1279 break; 1280 case NFS4_OPEN_CLAIM_PREVIOUS: 1281 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1282 break; 1283 default: 1284 return 0; 1285 } 1286 nfs_mark_delegation_referenced(delegation); 1287 return 1; 1288 } 1289 1290 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1291 { 1292 switch (fmode) { 1293 case FMODE_WRITE: 1294 state->n_wronly++; 1295 break; 1296 case FMODE_READ: 1297 state->n_rdonly++; 1298 break; 1299 case FMODE_READ|FMODE_WRITE: 1300 state->n_rdwr++; 1301 } 1302 nfs4_state_set_mode_locked(state, state->state | fmode); 1303 } 1304 1305 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1306 { 1307 struct nfs_client *clp = state->owner->so_server->nfs_client; 1308 bool need_recover = false; 1309 1310 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1311 need_recover = true; 1312 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1313 need_recover = true; 1314 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1315 need_recover = true; 1316 if (need_recover) 1317 nfs4_state_mark_reclaim_nograce(clp, state); 1318 } 1319 1320 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1321 nfs4_stateid *stateid) 1322 { 1323 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0) 1324 return true; 1325 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1326 nfs_test_and_clear_all_open_stateid(state); 1327 return true; 1328 } 1329 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) 1330 return true; 1331 return false; 1332 } 1333 1334 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1335 { 1336 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1337 return; 1338 if (state->n_wronly) 1339 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1340 if (state->n_rdonly) 1341 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1342 if (state->n_rdwr) 1343 set_bit(NFS_O_RDWR_STATE, &state->flags); 1344 set_bit(NFS_OPEN_STATE, &state->flags); 1345 } 1346 1347 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1348 nfs4_stateid *arg_stateid, 1349 nfs4_stateid *stateid, fmode_t fmode) 1350 { 1351 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1352 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1353 case FMODE_WRITE: 1354 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1355 break; 1356 case FMODE_READ: 1357 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1358 break; 1359 case 0: 1360 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1361 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1362 clear_bit(NFS_OPEN_STATE, &state->flags); 1363 } 1364 if (stateid == NULL) 1365 return; 1366 /* Handle races with OPEN */ 1367 if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) || 1368 (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1369 !nfs4_stateid_is_newer(stateid, &state->open_stateid))) { 1370 nfs_resync_open_stateid_locked(state); 1371 return; 1372 } 1373 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1374 nfs4_stateid_copy(&state->stateid, stateid); 1375 nfs4_stateid_copy(&state->open_stateid, stateid); 1376 } 1377 1378 static void nfs_clear_open_stateid(struct nfs4_state *state, 1379 nfs4_stateid *arg_stateid, 1380 nfs4_stateid *stateid, fmode_t fmode) 1381 { 1382 write_seqlock(&state->seqlock); 1383 nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode); 1384 write_sequnlock(&state->seqlock); 1385 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1386 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1387 } 1388 1389 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 1390 { 1391 switch (fmode) { 1392 case FMODE_READ: 1393 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1394 break; 1395 case FMODE_WRITE: 1396 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1397 break; 1398 case FMODE_READ|FMODE_WRITE: 1399 set_bit(NFS_O_RDWR_STATE, &state->flags); 1400 } 1401 if (!nfs_need_update_open_stateid(state, stateid)) 1402 return; 1403 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1404 nfs4_stateid_copy(&state->stateid, stateid); 1405 nfs4_stateid_copy(&state->open_stateid, stateid); 1406 } 1407 1408 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode) 1409 { 1410 /* 1411 * Protect the call to nfs4_state_set_mode_locked and 1412 * serialise the stateid update 1413 */ 1414 spin_lock(&state->owner->so_lock); 1415 write_seqlock(&state->seqlock); 1416 if (deleg_stateid != NULL) { 1417 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1418 set_bit(NFS_DELEGATED_STATE, &state->flags); 1419 } 1420 if (open_stateid != NULL) 1421 nfs_set_open_stateid_locked(state, open_stateid, fmode); 1422 write_sequnlock(&state->seqlock); 1423 update_open_stateflags(state, fmode); 1424 spin_unlock(&state->owner->so_lock); 1425 } 1426 1427 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode) 1428 { 1429 struct nfs_inode *nfsi = NFS_I(state->inode); 1430 struct nfs_delegation *deleg_cur; 1431 int ret = 0; 1432 1433 fmode &= (FMODE_READ|FMODE_WRITE); 1434 1435 rcu_read_lock(); 1436 deleg_cur = rcu_dereference(nfsi->delegation); 1437 if (deleg_cur == NULL) 1438 goto no_delegation; 1439 1440 spin_lock(&deleg_cur->lock); 1441 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1442 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1443 (deleg_cur->type & fmode) != fmode) 1444 goto no_delegation_unlock; 1445 1446 if (delegation == NULL) 1447 delegation = &deleg_cur->stateid; 1448 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1449 goto no_delegation_unlock; 1450 1451 nfs_mark_delegation_referenced(deleg_cur); 1452 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode); 1453 ret = 1; 1454 no_delegation_unlock: 1455 spin_unlock(&deleg_cur->lock); 1456 no_delegation: 1457 rcu_read_unlock(); 1458 1459 if (!ret && open_stateid != NULL) { 1460 __update_open_stateid(state, open_stateid, NULL, fmode); 1461 ret = 1; 1462 } 1463 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1464 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1465 1466 return ret; 1467 } 1468 1469 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1470 const nfs4_stateid *stateid) 1471 { 1472 struct nfs4_state *state = lsp->ls_state; 1473 bool ret = false; 1474 1475 spin_lock(&state->state_lock); 1476 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1477 goto out_noupdate; 1478 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1479 goto out_noupdate; 1480 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1481 ret = true; 1482 out_noupdate: 1483 spin_unlock(&state->state_lock); 1484 return ret; 1485 } 1486 1487 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1488 { 1489 struct nfs_delegation *delegation; 1490 1491 rcu_read_lock(); 1492 delegation = rcu_dereference(NFS_I(inode)->delegation); 1493 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1494 rcu_read_unlock(); 1495 return; 1496 } 1497 rcu_read_unlock(); 1498 nfs4_inode_return_delegation(inode); 1499 } 1500 1501 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1502 { 1503 struct nfs4_state *state = opendata->state; 1504 struct nfs_inode *nfsi = NFS_I(state->inode); 1505 struct nfs_delegation *delegation; 1506 int open_mode = opendata->o_arg.open_flags; 1507 fmode_t fmode = opendata->o_arg.fmode; 1508 enum open_claim_type4 claim = opendata->o_arg.claim; 1509 nfs4_stateid stateid; 1510 int ret = -EAGAIN; 1511 1512 for (;;) { 1513 spin_lock(&state->owner->so_lock); 1514 if (can_open_cached(state, fmode, open_mode)) { 1515 update_open_stateflags(state, fmode); 1516 spin_unlock(&state->owner->so_lock); 1517 goto out_return_state; 1518 } 1519 spin_unlock(&state->owner->so_lock); 1520 rcu_read_lock(); 1521 delegation = rcu_dereference(nfsi->delegation); 1522 if (!can_open_delegated(delegation, fmode, claim)) { 1523 rcu_read_unlock(); 1524 break; 1525 } 1526 /* Save the delegation */ 1527 nfs4_stateid_copy(&stateid, &delegation->stateid); 1528 rcu_read_unlock(); 1529 nfs_release_seqid(opendata->o_arg.seqid); 1530 if (!opendata->is_recover) { 1531 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1532 if (ret != 0) 1533 goto out; 1534 } 1535 ret = -EAGAIN; 1536 1537 /* Try to update the stateid using the delegation */ 1538 if (update_open_stateid(state, NULL, &stateid, fmode)) 1539 goto out_return_state; 1540 } 1541 out: 1542 return ERR_PTR(ret); 1543 out_return_state: 1544 atomic_inc(&state->count); 1545 return state; 1546 } 1547 1548 static void 1549 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1550 { 1551 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1552 struct nfs_delegation *delegation; 1553 int delegation_flags = 0; 1554 1555 rcu_read_lock(); 1556 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1557 if (delegation) 1558 delegation_flags = delegation->flags; 1559 rcu_read_unlock(); 1560 switch (data->o_arg.claim) { 1561 default: 1562 break; 1563 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1564 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1565 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1566 "returning a delegation for " 1567 "OPEN(CLAIM_DELEGATE_CUR)\n", 1568 clp->cl_hostname); 1569 return; 1570 } 1571 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1572 nfs_inode_set_delegation(state->inode, 1573 data->owner->so_cred, 1574 &data->o_res); 1575 else 1576 nfs_inode_reclaim_delegation(state->inode, 1577 data->owner->so_cred, 1578 &data->o_res); 1579 } 1580 1581 /* 1582 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1583 * and update the nfs4_state. 1584 */ 1585 static struct nfs4_state * 1586 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1587 { 1588 struct inode *inode = data->state->inode; 1589 struct nfs4_state *state = data->state; 1590 int ret; 1591 1592 if (!data->rpc_done) { 1593 if (data->rpc_status) { 1594 ret = data->rpc_status; 1595 goto err; 1596 } 1597 /* cached opens have already been processed */ 1598 goto update; 1599 } 1600 1601 ret = nfs_refresh_inode(inode, &data->f_attr); 1602 if (ret) 1603 goto err; 1604 1605 if (data->o_res.delegation_type != 0) 1606 nfs4_opendata_check_deleg(data, state); 1607 update: 1608 update_open_stateid(state, &data->o_res.stateid, NULL, 1609 data->o_arg.fmode); 1610 atomic_inc(&state->count); 1611 1612 return state; 1613 err: 1614 return ERR_PTR(ret); 1615 1616 } 1617 1618 static struct nfs4_state * 1619 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1620 { 1621 struct inode *inode; 1622 struct nfs4_state *state = NULL; 1623 int ret; 1624 1625 if (!data->rpc_done) { 1626 state = nfs4_try_open_cached(data); 1627 trace_nfs4_cached_open(data->state); 1628 goto out; 1629 } 1630 1631 ret = -EAGAIN; 1632 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1633 goto err; 1634 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label); 1635 ret = PTR_ERR(inode); 1636 if (IS_ERR(inode)) 1637 goto err; 1638 ret = -ENOMEM; 1639 state = nfs4_get_open_state(inode, data->owner); 1640 if (state == NULL) 1641 goto err_put_inode; 1642 if (data->o_res.delegation_type != 0) 1643 nfs4_opendata_check_deleg(data, state); 1644 update_open_stateid(state, &data->o_res.stateid, NULL, 1645 data->o_arg.fmode); 1646 iput(inode); 1647 out: 1648 nfs_release_seqid(data->o_arg.seqid); 1649 return state; 1650 err_put_inode: 1651 iput(inode); 1652 err: 1653 return ERR_PTR(ret); 1654 } 1655 1656 static struct nfs4_state * 1657 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1658 { 1659 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1660 return _nfs4_opendata_reclaim_to_nfs4_state(data); 1661 return _nfs4_opendata_to_nfs4_state(data); 1662 } 1663 1664 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1665 { 1666 struct nfs_inode *nfsi = NFS_I(state->inode); 1667 struct nfs_open_context *ctx; 1668 1669 spin_lock(&state->inode->i_lock); 1670 list_for_each_entry(ctx, &nfsi->open_files, list) { 1671 if (ctx->state != state) 1672 continue; 1673 get_nfs_open_context(ctx); 1674 spin_unlock(&state->inode->i_lock); 1675 return ctx; 1676 } 1677 spin_unlock(&state->inode->i_lock); 1678 return ERR_PTR(-ENOENT); 1679 } 1680 1681 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1682 struct nfs4_state *state, enum open_claim_type4 claim) 1683 { 1684 struct nfs4_opendata *opendata; 1685 1686 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1687 NULL, NULL, claim, GFP_NOFS); 1688 if (opendata == NULL) 1689 return ERR_PTR(-ENOMEM); 1690 opendata->state = state; 1691 atomic_inc(&state->count); 1692 return opendata; 1693 } 1694 1695 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 1696 fmode_t fmode) 1697 { 1698 struct nfs4_state *newstate; 1699 int ret; 1700 1701 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 1702 return 0; 1703 opendata->o_arg.open_flags = 0; 1704 opendata->o_arg.fmode = fmode; 1705 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 1706 NFS_SB(opendata->dentry->d_sb), 1707 fmode, 0); 1708 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1709 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1710 nfs4_init_opendata_res(opendata); 1711 ret = _nfs4_recover_proc_open(opendata); 1712 if (ret != 0) 1713 return ret; 1714 newstate = nfs4_opendata_to_nfs4_state(opendata); 1715 if (IS_ERR(newstate)) 1716 return PTR_ERR(newstate); 1717 if (newstate != opendata->state) 1718 ret = -ESTALE; 1719 nfs4_close_state(newstate, fmode); 1720 return ret; 1721 } 1722 1723 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1724 { 1725 int ret; 1726 1727 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1728 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1729 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1730 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1731 /* memory barrier prior to reading state->n_* */ 1732 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1733 clear_bit(NFS_OPEN_STATE, &state->flags); 1734 smp_rmb(); 1735 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1736 if (ret != 0) 1737 return ret; 1738 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1739 if (ret != 0) 1740 return ret; 1741 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 1742 if (ret != 0) 1743 return ret; 1744 /* 1745 * We may have performed cached opens for all three recoveries. 1746 * Check if we need to update the current stateid. 1747 */ 1748 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1749 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1750 write_seqlock(&state->seqlock); 1751 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1752 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1753 write_sequnlock(&state->seqlock); 1754 } 1755 return 0; 1756 } 1757 1758 /* 1759 * OPEN_RECLAIM: 1760 * reclaim state on the server after a reboot. 1761 */ 1762 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1763 { 1764 struct nfs_delegation *delegation; 1765 struct nfs4_opendata *opendata; 1766 fmode_t delegation_type = 0; 1767 int status; 1768 1769 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1770 NFS4_OPEN_CLAIM_PREVIOUS); 1771 if (IS_ERR(opendata)) 1772 return PTR_ERR(opendata); 1773 rcu_read_lock(); 1774 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1775 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1776 delegation_type = delegation->type; 1777 rcu_read_unlock(); 1778 opendata->o_arg.u.delegation_type = delegation_type; 1779 status = nfs4_open_recover(opendata, state); 1780 nfs4_opendata_put(opendata); 1781 return status; 1782 } 1783 1784 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1785 { 1786 struct nfs_server *server = NFS_SERVER(state->inode); 1787 struct nfs4_exception exception = { }; 1788 int err; 1789 do { 1790 err = _nfs4_do_open_reclaim(ctx, state); 1791 trace_nfs4_open_reclaim(ctx, 0, err); 1792 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 1793 continue; 1794 if (err != -NFS4ERR_DELAY) 1795 break; 1796 nfs4_handle_exception(server, err, &exception); 1797 } while (exception.retry); 1798 return err; 1799 } 1800 1801 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 1802 { 1803 struct nfs_open_context *ctx; 1804 int ret; 1805 1806 ctx = nfs4_state_find_open_context(state); 1807 if (IS_ERR(ctx)) 1808 return -EAGAIN; 1809 ret = nfs4_do_open_reclaim(ctx, state); 1810 put_nfs_open_context(ctx); 1811 return ret; 1812 } 1813 1814 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err) 1815 { 1816 switch (err) { 1817 default: 1818 printk(KERN_ERR "NFS: %s: unhandled error " 1819 "%d.\n", __func__, err); 1820 case 0: 1821 case -ENOENT: 1822 case -EAGAIN: 1823 case -ESTALE: 1824 break; 1825 case -NFS4ERR_BADSESSION: 1826 case -NFS4ERR_BADSLOT: 1827 case -NFS4ERR_BAD_HIGH_SLOT: 1828 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1829 case -NFS4ERR_DEADSESSION: 1830 set_bit(NFS_DELEGATED_STATE, &state->flags); 1831 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 1832 return -EAGAIN; 1833 case -NFS4ERR_STALE_CLIENTID: 1834 case -NFS4ERR_STALE_STATEID: 1835 set_bit(NFS_DELEGATED_STATE, &state->flags); 1836 case -NFS4ERR_EXPIRED: 1837 /* Don't recall a delegation if it was lost */ 1838 nfs4_schedule_lease_recovery(server->nfs_client); 1839 return -EAGAIN; 1840 case -NFS4ERR_MOVED: 1841 nfs4_schedule_migration_recovery(server); 1842 return -EAGAIN; 1843 case -NFS4ERR_LEASE_MOVED: 1844 nfs4_schedule_lease_moved_recovery(server->nfs_client); 1845 return -EAGAIN; 1846 case -NFS4ERR_DELEG_REVOKED: 1847 case -NFS4ERR_ADMIN_REVOKED: 1848 case -NFS4ERR_BAD_STATEID: 1849 case -NFS4ERR_OPENMODE: 1850 nfs_inode_find_state_and_recover(state->inode, 1851 stateid); 1852 nfs4_schedule_stateid_recovery(server, state); 1853 return -EAGAIN; 1854 case -NFS4ERR_DELAY: 1855 case -NFS4ERR_GRACE: 1856 set_bit(NFS_DELEGATED_STATE, &state->flags); 1857 ssleep(1); 1858 return -EAGAIN; 1859 case -ENOMEM: 1860 case -NFS4ERR_DENIED: 1861 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 1862 return 0; 1863 } 1864 return err; 1865 } 1866 1867 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 1868 struct nfs4_state *state, const nfs4_stateid *stateid, 1869 fmode_t type) 1870 { 1871 struct nfs_server *server = NFS_SERVER(state->inode); 1872 struct nfs4_opendata *opendata; 1873 int err = 0; 1874 1875 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1876 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 1877 if (IS_ERR(opendata)) 1878 return PTR_ERR(opendata); 1879 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 1880 write_seqlock(&state->seqlock); 1881 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1882 write_sequnlock(&state->seqlock); 1883 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1884 switch (type & (FMODE_READ|FMODE_WRITE)) { 1885 case FMODE_READ|FMODE_WRITE: 1886 case FMODE_WRITE: 1887 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1888 if (err) 1889 break; 1890 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1891 if (err) 1892 break; 1893 case FMODE_READ: 1894 err = nfs4_open_recover_helper(opendata, FMODE_READ); 1895 } 1896 nfs4_opendata_put(opendata); 1897 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 1898 } 1899 1900 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 1901 { 1902 struct nfs4_opendata *data = calldata; 1903 1904 nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl, 1905 &data->c_arg.seq_args, &data->c_res.seq_res, task); 1906 } 1907 1908 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 1909 { 1910 struct nfs4_opendata *data = calldata; 1911 1912 nfs40_sequence_done(task, &data->c_res.seq_res); 1913 1914 data->rpc_status = task->tk_status; 1915 if (data->rpc_status == 0) { 1916 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 1917 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1918 renew_lease(data->o_res.server, data->timestamp); 1919 data->rpc_done = 1; 1920 } 1921 } 1922 1923 static void nfs4_open_confirm_release(void *calldata) 1924 { 1925 struct nfs4_opendata *data = calldata; 1926 struct nfs4_state *state = NULL; 1927 1928 /* If this request hasn't been cancelled, do nothing */ 1929 if (data->cancelled == 0) 1930 goto out_free; 1931 /* In case of error, no cleanup! */ 1932 if (!data->rpc_done) 1933 goto out_free; 1934 state = nfs4_opendata_to_nfs4_state(data); 1935 if (!IS_ERR(state)) 1936 nfs4_close_state(state, data->o_arg.fmode); 1937 out_free: 1938 nfs4_opendata_put(data); 1939 } 1940 1941 static const struct rpc_call_ops nfs4_open_confirm_ops = { 1942 .rpc_call_prepare = nfs4_open_confirm_prepare, 1943 .rpc_call_done = nfs4_open_confirm_done, 1944 .rpc_release = nfs4_open_confirm_release, 1945 }; 1946 1947 /* 1948 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 1949 */ 1950 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 1951 { 1952 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 1953 struct rpc_task *task; 1954 struct rpc_message msg = { 1955 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 1956 .rpc_argp = &data->c_arg, 1957 .rpc_resp = &data->c_res, 1958 .rpc_cred = data->owner->so_cred, 1959 }; 1960 struct rpc_task_setup task_setup_data = { 1961 .rpc_client = server->client, 1962 .rpc_message = &msg, 1963 .callback_ops = &nfs4_open_confirm_ops, 1964 .callback_data = data, 1965 .workqueue = nfsiod_workqueue, 1966 .flags = RPC_TASK_ASYNC, 1967 }; 1968 int status; 1969 1970 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); 1971 kref_get(&data->kref); 1972 data->rpc_done = 0; 1973 data->rpc_status = 0; 1974 data->timestamp = jiffies; 1975 if (data->is_recover) 1976 nfs4_set_sequence_privileged(&data->c_arg.seq_args); 1977 task = rpc_run_task(&task_setup_data); 1978 if (IS_ERR(task)) 1979 return PTR_ERR(task); 1980 status = nfs4_wait_for_completion_rpc_task(task); 1981 if (status != 0) { 1982 data->cancelled = 1; 1983 smp_wmb(); 1984 } else 1985 status = data->rpc_status; 1986 rpc_put_task(task); 1987 return status; 1988 } 1989 1990 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 1991 { 1992 struct nfs4_opendata *data = calldata; 1993 struct nfs4_state_owner *sp = data->owner; 1994 struct nfs_client *clp = sp->so_server->nfs_client; 1995 enum open_claim_type4 claim = data->o_arg.claim; 1996 1997 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 1998 goto out_wait; 1999 /* 2000 * Check if we still need to send an OPEN call, or if we can use 2001 * a delegation instead. 2002 */ 2003 if (data->state != NULL) { 2004 struct nfs_delegation *delegation; 2005 2006 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 2007 goto out_no_action; 2008 rcu_read_lock(); 2009 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 2010 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2011 goto unlock_no_action; 2012 rcu_read_unlock(); 2013 } 2014 /* Update client id. */ 2015 data->o_arg.clientid = clp->cl_clientid; 2016 switch (claim) { 2017 default: 2018 break; 2019 case NFS4_OPEN_CLAIM_PREVIOUS: 2020 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2021 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2022 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2023 case NFS4_OPEN_CLAIM_FH: 2024 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2025 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 2026 } 2027 data->timestamp = jiffies; 2028 if (nfs4_setup_sequence(data->o_arg.server, 2029 &data->o_arg.seq_args, 2030 &data->o_res.seq_res, 2031 task) != 0) 2032 nfs_release_seqid(data->o_arg.seqid); 2033 2034 /* Set the create mode (note dependency on the session type) */ 2035 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2036 if (data->o_arg.open_flags & O_EXCL) { 2037 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2038 if (nfs4_has_persistent_session(clp)) 2039 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2040 else if (clp->cl_mvops->minor_version > 0) 2041 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2042 } 2043 return; 2044 unlock_no_action: 2045 trace_nfs4_cached_open(data->state); 2046 rcu_read_unlock(); 2047 out_no_action: 2048 task->tk_action = NULL; 2049 out_wait: 2050 nfs4_sequence_done(task, &data->o_res.seq_res); 2051 } 2052 2053 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2054 { 2055 struct nfs4_opendata *data = calldata; 2056 2057 data->rpc_status = task->tk_status; 2058 2059 if (!nfs4_sequence_done(task, &data->o_res.seq_res)) 2060 return; 2061 2062 if (task->tk_status == 0) { 2063 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2064 switch (data->o_res.f_attr->mode & S_IFMT) { 2065 case S_IFREG: 2066 break; 2067 case S_IFLNK: 2068 data->rpc_status = -ELOOP; 2069 break; 2070 case S_IFDIR: 2071 data->rpc_status = -EISDIR; 2072 break; 2073 default: 2074 data->rpc_status = -ENOTDIR; 2075 } 2076 } 2077 renew_lease(data->o_res.server, data->timestamp); 2078 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2079 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2080 } 2081 data->rpc_done = 1; 2082 } 2083 2084 static void nfs4_open_release(void *calldata) 2085 { 2086 struct nfs4_opendata *data = calldata; 2087 struct nfs4_state *state = NULL; 2088 2089 /* If this request hasn't been cancelled, do nothing */ 2090 if (data->cancelled == 0) 2091 goto out_free; 2092 /* In case of error, no cleanup! */ 2093 if (data->rpc_status != 0 || !data->rpc_done) 2094 goto out_free; 2095 /* In case we need an open_confirm, no cleanup! */ 2096 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2097 goto out_free; 2098 state = nfs4_opendata_to_nfs4_state(data); 2099 if (!IS_ERR(state)) 2100 nfs4_close_state(state, data->o_arg.fmode); 2101 out_free: 2102 nfs4_opendata_put(data); 2103 } 2104 2105 static const struct rpc_call_ops nfs4_open_ops = { 2106 .rpc_call_prepare = nfs4_open_prepare, 2107 .rpc_call_done = nfs4_open_done, 2108 .rpc_release = nfs4_open_release, 2109 }; 2110 2111 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 2112 { 2113 struct inode *dir = d_inode(data->dir); 2114 struct nfs_server *server = NFS_SERVER(dir); 2115 struct nfs_openargs *o_arg = &data->o_arg; 2116 struct nfs_openres *o_res = &data->o_res; 2117 struct rpc_task *task; 2118 struct rpc_message msg = { 2119 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2120 .rpc_argp = o_arg, 2121 .rpc_resp = o_res, 2122 .rpc_cred = data->owner->so_cred, 2123 }; 2124 struct rpc_task_setup task_setup_data = { 2125 .rpc_client = server->client, 2126 .rpc_message = &msg, 2127 .callback_ops = &nfs4_open_ops, 2128 .callback_data = data, 2129 .workqueue = nfsiod_workqueue, 2130 .flags = RPC_TASK_ASYNC, 2131 }; 2132 int status; 2133 2134 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 2135 kref_get(&data->kref); 2136 data->rpc_done = 0; 2137 data->rpc_status = 0; 2138 data->cancelled = 0; 2139 data->is_recover = 0; 2140 if (isrecover) { 2141 nfs4_set_sequence_privileged(&o_arg->seq_args); 2142 data->is_recover = 1; 2143 } 2144 task = rpc_run_task(&task_setup_data); 2145 if (IS_ERR(task)) 2146 return PTR_ERR(task); 2147 status = nfs4_wait_for_completion_rpc_task(task); 2148 if (status != 0) { 2149 data->cancelled = 1; 2150 smp_wmb(); 2151 } else 2152 status = data->rpc_status; 2153 rpc_put_task(task); 2154 2155 return status; 2156 } 2157 2158 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2159 { 2160 struct inode *dir = d_inode(data->dir); 2161 struct nfs_openres *o_res = &data->o_res; 2162 int status; 2163 2164 status = nfs4_run_open_task(data, 1); 2165 if (status != 0 || !data->rpc_done) 2166 return status; 2167 2168 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2169 2170 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2171 status = _nfs4_proc_open_confirm(data); 2172 if (status != 0) 2173 return status; 2174 } 2175 2176 return status; 2177 } 2178 2179 /* 2180 * Additional permission checks in order to distinguish between an 2181 * open for read, and an open for execute. This works around the 2182 * fact that NFSv4 OPEN treats read and execute permissions as being 2183 * the same. 2184 * Note that in the non-execute case, we want to turn off permission 2185 * checking if we just created a new file (POSIX open() semantics). 2186 */ 2187 static int nfs4_opendata_access(struct rpc_cred *cred, 2188 struct nfs4_opendata *opendata, 2189 struct nfs4_state *state, fmode_t fmode, 2190 int openflags) 2191 { 2192 struct nfs_access_entry cache; 2193 u32 mask; 2194 2195 /* access call failed or for some reason the server doesn't 2196 * support any access modes -- defer access call until later */ 2197 if (opendata->o_res.access_supported == 0) 2198 return 0; 2199 2200 mask = 0; 2201 /* 2202 * Use openflags to check for exec, because fmode won't 2203 * always have FMODE_EXEC set when file open for exec. 2204 */ 2205 if (openflags & __FMODE_EXEC) { 2206 /* ONLY check for exec rights */ 2207 mask = MAY_EXEC; 2208 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2209 mask = MAY_READ; 2210 2211 cache.cred = cred; 2212 cache.jiffies = jiffies; 2213 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2214 nfs_access_add_cache(state->inode, &cache); 2215 2216 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 2217 return 0; 2218 2219 /* even though OPEN succeeded, access is denied. Close the file */ 2220 nfs4_close_state(state, fmode); 2221 return -EACCES; 2222 } 2223 2224 /* 2225 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2226 */ 2227 static int _nfs4_proc_open(struct nfs4_opendata *data) 2228 { 2229 struct inode *dir = d_inode(data->dir); 2230 struct nfs_server *server = NFS_SERVER(dir); 2231 struct nfs_openargs *o_arg = &data->o_arg; 2232 struct nfs_openres *o_res = &data->o_res; 2233 int status; 2234 2235 status = nfs4_run_open_task(data, 0); 2236 if (!data->rpc_done) 2237 return status; 2238 if (status != 0) { 2239 if (status == -NFS4ERR_BADNAME && 2240 !(o_arg->open_flags & O_CREAT)) 2241 return -ENOENT; 2242 return status; 2243 } 2244 2245 nfs_fattr_map_and_free_names(server, &data->f_attr); 2246 2247 if (o_arg->open_flags & O_CREAT) { 2248 update_changeattr(dir, &o_res->cinfo); 2249 if (o_arg->open_flags & O_EXCL) 2250 data->file_created = 1; 2251 else if (o_res->cinfo.before != o_res->cinfo.after) 2252 data->file_created = 1; 2253 } 2254 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2255 server->caps &= ~NFS_CAP_POSIX_LOCK; 2256 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2257 status = _nfs4_proc_open_confirm(data); 2258 if (status != 0) 2259 return status; 2260 } 2261 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 2262 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2263 return 0; 2264 } 2265 2266 static int nfs4_recover_expired_lease(struct nfs_server *server) 2267 { 2268 return nfs4_client_recover_expired_lease(server->nfs_client); 2269 } 2270 2271 /* 2272 * OPEN_EXPIRED: 2273 * reclaim state on the server after a network partition. 2274 * Assumes caller holds the appropriate lock 2275 */ 2276 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2277 { 2278 struct nfs4_opendata *opendata; 2279 int ret; 2280 2281 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2282 NFS4_OPEN_CLAIM_FH); 2283 if (IS_ERR(opendata)) 2284 return PTR_ERR(opendata); 2285 ret = nfs4_open_recover(opendata, state); 2286 if (ret == -ESTALE) 2287 d_drop(ctx->dentry); 2288 nfs4_opendata_put(opendata); 2289 return ret; 2290 } 2291 2292 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2293 { 2294 struct nfs_server *server = NFS_SERVER(state->inode); 2295 struct nfs4_exception exception = { }; 2296 int err; 2297 2298 do { 2299 err = _nfs4_open_expired(ctx, state); 2300 trace_nfs4_open_expired(ctx, 0, err); 2301 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2302 continue; 2303 switch (err) { 2304 default: 2305 goto out; 2306 case -NFS4ERR_GRACE: 2307 case -NFS4ERR_DELAY: 2308 nfs4_handle_exception(server, err, &exception); 2309 err = 0; 2310 } 2311 } while (exception.retry); 2312 out: 2313 return err; 2314 } 2315 2316 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2317 { 2318 struct nfs_open_context *ctx; 2319 int ret; 2320 2321 ctx = nfs4_state_find_open_context(state); 2322 if (IS_ERR(ctx)) 2323 return -EAGAIN; 2324 ret = nfs4_do_open_expired(ctx, state); 2325 put_nfs_open_context(ctx); 2326 return ret; 2327 } 2328 2329 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state) 2330 { 2331 nfs_remove_bad_delegation(state->inode); 2332 write_seqlock(&state->seqlock); 2333 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2334 write_sequnlock(&state->seqlock); 2335 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2336 } 2337 2338 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2339 { 2340 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2341 nfs_finish_clear_delegation_stateid(state); 2342 } 2343 2344 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2345 { 2346 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2347 nfs40_clear_delegation_stateid(state); 2348 return nfs4_open_expired(sp, state); 2349 } 2350 2351 #if defined(CONFIG_NFS_V4_1) 2352 static void nfs41_check_delegation_stateid(struct nfs4_state *state) 2353 { 2354 struct nfs_server *server = NFS_SERVER(state->inode); 2355 nfs4_stateid stateid; 2356 struct nfs_delegation *delegation; 2357 struct rpc_cred *cred; 2358 int status; 2359 2360 /* Get the delegation credential for use by test/free_stateid */ 2361 rcu_read_lock(); 2362 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2363 if (delegation == NULL) { 2364 rcu_read_unlock(); 2365 return; 2366 } 2367 2368 nfs4_stateid_copy(&stateid, &delegation->stateid); 2369 cred = get_rpccred(delegation->cred); 2370 rcu_read_unlock(); 2371 status = nfs41_test_stateid(server, &stateid, cred); 2372 trace_nfs4_test_delegation_stateid(state, NULL, status); 2373 2374 if (status != NFS_OK) { 2375 /* Free the stateid unless the server explicitly 2376 * informs us the stateid is unrecognized. */ 2377 if (status != -NFS4ERR_BAD_STATEID) 2378 nfs41_free_stateid(server, &stateid, cred); 2379 nfs_finish_clear_delegation_stateid(state); 2380 } 2381 2382 put_rpccred(cred); 2383 } 2384 2385 /** 2386 * nfs41_check_open_stateid - possibly free an open stateid 2387 * 2388 * @state: NFSv4 state for an inode 2389 * 2390 * Returns NFS_OK if recovery for this stateid is now finished. 2391 * Otherwise a negative NFS4ERR value is returned. 2392 */ 2393 static int nfs41_check_open_stateid(struct nfs4_state *state) 2394 { 2395 struct nfs_server *server = NFS_SERVER(state->inode); 2396 nfs4_stateid *stateid = &state->open_stateid; 2397 struct rpc_cred *cred = state->owner->so_cred; 2398 int status; 2399 2400 /* If a state reset has been done, test_stateid is unneeded */ 2401 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 2402 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 2403 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 2404 return -NFS4ERR_BAD_STATEID; 2405 2406 status = nfs41_test_stateid(server, stateid, cred); 2407 trace_nfs4_test_open_stateid(state, NULL, status); 2408 if (status != NFS_OK) { 2409 /* Free the stateid unless the server explicitly 2410 * informs us the stateid is unrecognized. */ 2411 if (status != -NFS4ERR_BAD_STATEID) 2412 nfs41_free_stateid(server, stateid, cred); 2413 2414 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2415 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2416 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2417 clear_bit(NFS_OPEN_STATE, &state->flags); 2418 } 2419 return status; 2420 } 2421 2422 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2423 { 2424 int status; 2425 2426 nfs41_check_delegation_stateid(state); 2427 status = nfs41_check_open_stateid(state); 2428 if (status != NFS_OK) 2429 status = nfs4_open_expired(sp, state); 2430 return status; 2431 } 2432 #endif 2433 2434 /* 2435 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2436 * fields corresponding to attributes that were used to store the verifier. 2437 * Make sure we clobber those fields in the later setattr call 2438 */ 2439 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2440 struct iattr *sattr, struct nfs4_label **label) 2441 { 2442 const u32 *attrset = opendata->o_res.attrset; 2443 2444 if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2445 !(sattr->ia_valid & ATTR_ATIME_SET)) 2446 sattr->ia_valid |= ATTR_ATIME; 2447 2448 if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2449 !(sattr->ia_valid & ATTR_MTIME_SET)) 2450 sattr->ia_valid |= ATTR_MTIME; 2451 2452 /* Except MODE, it seems harmless of setting twice. */ 2453 if ((attrset[1] & FATTR4_WORD1_MODE)) 2454 sattr->ia_valid &= ~ATTR_MODE; 2455 2456 if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL) 2457 *label = NULL; 2458 } 2459 2460 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2461 fmode_t fmode, 2462 int flags, 2463 struct nfs_open_context *ctx) 2464 { 2465 struct nfs4_state_owner *sp = opendata->owner; 2466 struct nfs_server *server = sp->so_server; 2467 struct dentry *dentry; 2468 struct nfs4_state *state; 2469 unsigned int seq; 2470 int ret; 2471 2472 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2473 2474 ret = _nfs4_proc_open(opendata); 2475 if (ret != 0) 2476 goto out; 2477 2478 state = nfs4_opendata_to_nfs4_state(opendata); 2479 ret = PTR_ERR(state); 2480 if (IS_ERR(state)) 2481 goto out; 2482 if (server->caps & NFS_CAP_POSIX_LOCK) 2483 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2484 2485 dentry = opendata->dentry; 2486 if (d_really_is_negative(dentry)) { 2487 struct dentry *alias; 2488 d_drop(dentry); 2489 alias = d_exact_alias(dentry, state->inode); 2490 if (!alias) 2491 alias = d_splice_alias(igrab(state->inode), dentry); 2492 /* d_splice_alias() can't fail here - it's a non-directory */ 2493 if (alias) { 2494 dput(ctx->dentry); 2495 ctx->dentry = dentry = alias; 2496 } 2497 nfs_set_verifier(dentry, 2498 nfs_save_change_attribute(d_inode(opendata->dir))); 2499 } 2500 2501 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2502 if (ret != 0) 2503 goto out; 2504 2505 ctx->state = state; 2506 if (d_inode(dentry) == state->inode) { 2507 nfs_inode_attach_open_context(ctx); 2508 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2509 nfs4_schedule_stateid_recovery(server, state); 2510 } 2511 out: 2512 return ret; 2513 } 2514 2515 /* 2516 * Returns a referenced nfs4_state 2517 */ 2518 static int _nfs4_do_open(struct inode *dir, 2519 struct nfs_open_context *ctx, 2520 int flags, 2521 struct iattr *sattr, 2522 struct nfs4_label *label, 2523 int *opened) 2524 { 2525 struct nfs4_state_owner *sp; 2526 struct nfs4_state *state = NULL; 2527 struct nfs_server *server = NFS_SERVER(dir); 2528 struct nfs4_opendata *opendata; 2529 struct dentry *dentry = ctx->dentry; 2530 struct rpc_cred *cred = ctx->cred; 2531 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2532 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2533 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2534 struct nfs4_label *olabel = NULL; 2535 int status; 2536 2537 /* Protect against reboot recovery conflicts */ 2538 status = -ENOMEM; 2539 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2540 if (sp == NULL) { 2541 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2542 goto out_err; 2543 } 2544 status = nfs4_recover_expired_lease(server); 2545 if (status != 0) 2546 goto err_put_state_owner; 2547 if (d_really_is_positive(dentry)) 2548 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 2549 status = -ENOMEM; 2550 if (d_really_is_positive(dentry)) 2551 claim = NFS4_OPEN_CLAIM_FH; 2552 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, 2553 label, claim, GFP_KERNEL); 2554 if (opendata == NULL) 2555 goto err_put_state_owner; 2556 2557 if (label) { 2558 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2559 if (IS_ERR(olabel)) { 2560 status = PTR_ERR(olabel); 2561 goto err_opendata_put; 2562 } 2563 } 2564 2565 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2566 if (!opendata->f_attr.mdsthreshold) { 2567 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2568 if (!opendata->f_attr.mdsthreshold) 2569 goto err_free_label; 2570 } 2571 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2572 } 2573 if (d_really_is_positive(dentry)) 2574 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 2575 2576 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2577 if (status != 0) 2578 goto err_free_label; 2579 state = ctx->state; 2580 2581 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 2582 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2583 nfs4_exclusive_attrset(opendata, sattr, &label); 2584 /* 2585 * send create attributes which was not set by open 2586 * with an extra setattr. 2587 */ 2588 if (sattr->ia_valid & NFS4_VALID_ATTRS) { 2589 nfs_fattr_init(opendata->o_res.f_attr); 2590 status = nfs4_do_setattr(state->inode, cred, 2591 opendata->o_res.f_attr, sattr, 2592 state, label, olabel); 2593 if (status == 0) { 2594 nfs_setattr_update_inode(state->inode, sattr, 2595 opendata->o_res.f_attr); 2596 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2597 } 2598 } 2599 } 2600 if (opened && opendata->file_created) 2601 *opened |= FILE_CREATED; 2602 2603 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2604 *ctx_th = opendata->f_attr.mdsthreshold; 2605 opendata->f_attr.mdsthreshold = NULL; 2606 } 2607 2608 nfs4_label_free(olabel); 2609 2610 nfs4_opendata_put(opendata); 2611 nfs4_put_state_owner(sp); 2612 return 0; 2613 err_free_label: 2614 nfs4_label_free(olabel); 2615 err_opendata_put: 2616 nfs4_opendata_put(opendata); 2617 err_put_state_owner: 2618 nfs4_put_state_owner(sp); 2619 out_err: 2620 return status; 2621 } 2622 2623 2624 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2625 struct nfs_open_context *ctx, 2626 int flags, 2627 struct iattr *sattr, 2628 struct nfs4_label *label, 2629 int *opened) 2630 { 2631 struct nfs_server *server = NFS_SERVER(dir); 2632 struct nfs4_exception exception = { }; 2633 struct nfs4_state *res; 2634 int status; 2635 2636 do { 2637 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened); 2638 res = ctx->state; 2639 trace_nfs4_open_file(ctx, flags, status); 2640 if (status == 0) 2641 break; 2642 /* NOTE: BAD_SEQID means the server and client disagree about the 2643 * book-keeping w.r.t. state-changing operations 2644 * (OPEN/CLOSE/LOCK/LOCKU...) 2645 * It is actually a sign of a bug on the client or on the server. 2646 * 2647 * If we receive a BAD_SEQID error in the particular case of 2648 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2649 * have unhashed the old state_owner for us, and that we can 2650 * therefore safely retry using a new one. We should still warn 2651 * the user though... 2652 */ 2653 if (status == -NFS4ERR_BAD_SEQID) { 2654 pr_warn_ratelimited("NFS: v4 server %s " 2655 " returned a bad sequence-id error!\n", 2656 NFS_SERVER(dir)->nfs_client->cl_hostname); 2657 exception.retry = 1; 2658 continue; 2659 } 2660 /* 2661 * BAD_STATEID on OPEN means that the server cancelled our 2662 * state before it received the OPEN_CONFIRM. 2663 * Recover by retrying the request as per the discussion 2664 * on Page 181 of RFC3530. 2665 */ 2666 if (status == -NFS4ERR_BAD_STATEID) { 2667 exception.retry = 1; 2668 continue; 2669 } 2670 if (status == -EAGAIN) { 2671 /* We must have found a delegation */ 2672 exception.retry = 1; 2673 continue; 2674 } 2675 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2676 continue; 2677 res = ERR_PTR(nfs4_handle_exception(server, 2678 status, &exception)); 2679 } while (exception.retry); 2680 return res; 2681 } 2682 2683 static int _nfs4_do_setattr(struct inode *inode, 2684 struct nfs_setattrargs *arg, 2685 struct nfs_setattrres *res, 2686 struct rpc_cred *cred, 2687 struct nfs4_state *state) 2688 { 2689 struct nfs_server *server = NFS_SERVER(inode); 2690 struct rpc_message msg = { 2691 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2692 .rpc_argp = arg, 2693 .rpc_resp = res, 2694 .rpc_cred = cred, 2695 }; 2696 struct rpc_cred *delegation_cred = NULL; 2697 unsigned long timestamp = jiffies; 2698 fmode_t fmode; 2699 bool truncate; 2700 int status; 2701 2702 nfs_fattr_init(res->fattr); 2703 2704 /* Servers should only apply open mode checks for file size changes */ 2705 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 2706 fmode = truncate ? FMODE_WRITE : FMODE_READ; 2707 2708 if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) { 2709 /* Use that stateid */ 2710 } else if (truncate && state != NULL) { 2711 struct nfs_lockowner lockowner = { 2712 .l_owner = current->files, 2713 .l_pid = current->tgid, 2714 }; 2715 if (!nfs4_valid_open_stateid(state)) 2716 return -EBADF; 2717 if (nfs4_select_rw_stateid(state, FMODE_WRITE, &lockowner, 2718 &arg->stateid, &delegation_cred) == -EIO) 2719 return -EBADF; 2720 } else 2721 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 2722 if (delegation_cred) 2723 msg.rpc_cred = delegation_cred; 2724 2725 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 2726 2727 put_rpccred(delegation_cred); 2728 if (status == 0 && state != NULL) 2729 renew_lease(server, timestamp); 2730 trace_nfs4_setattr(inode, &arg->stateid, status); 2731 return status; 2732 } 2733 2734 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2735 struct nfs_fattr *fattr, struct iattr *sattr, 2736 struct nfs4_state *state, struct nfs4_label *ilabel, 2737 struct nfs4_label *olabel) 2738 { 2739 struct nfs_server *server = NFS_SERVER(inode); 2740 struct nfs_setattrargs arg = { 2741 .fh = NFS_FH(inode), 2742 .iap = sattr, 2743 .server = server, 2744 .bitmask = server->attr_bitmask, 2745 .label = ilabel, 2746 }; 2747 struct nfs_setattrres res = { 2748 .fattr = fattr, 2749 .label = olabel, 2750 .server = server, 2751 }; 2752 struct nfs4_exception exception = { 2753 .state = state, 2754 .inode = inode, 2755 .stateid = &arg.stateid, 2756 }; 2757 int err; 2758 2759 arg.bitmask = nfs4_bitmask(server, ilabel); 2760 if (ilabel) 2761 arg.bitmask = nfs4_bitmask(server, olabel); 2762 2763 do { 2764 err = _nfs4_do_setattr(inode, &arg, &res, cred, state); 2765 switch (err) { 2766 case -NFS4ERR_OPENMODE: 2767 if (!(sattr->ia_valid & ATTR_SIZE)) { 2768 pr_warn_once("NFSv4: server %s is incorrectly " 2769 "applying open mode checks to " 2770 "a SETATTR that is not " 2771 "changing file size.\n", 2772 server->nfs_client->cl_hostname); 2773 } 2774 if (state && !(state->state & FMODE_WRITE)) { 2775 err = -EBADF; 2776 if (sattr->ia_valid & ATTR_OPEN) 2777 err = -EACCES; 2778 goto out; 2779 } 2780 } 2781 err = nfs4_handle_exception(server, err, &exception); 2782 } while (exception.retry); 2783 out: 2784 return err; 2785 } 2786 2787 static bool 2788 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 2789 { 2790 if (inode == NULL || !nfs_have_layout(inode)) 2791 return false; 2792 2793 return pnfs_wait_on_layoutreturn(inode, task); 2794 } 2795 2796 struct nfs4_closedata { 2797 struct inode *inode; 2798 struct nfs4_state *state; 2799 struct nfs_closeargs arg; 2800 struct nfs_closeres res; 2801 struct nfs_fattr fattr; 2802 unsigned long timestamp; 2803 bool roc; 2804 u32 roc_barrier; 2805 }; 2806 2807 static void nfs4_free_closedata(void *data) 2808 { 2809 struct nfs4_closedata *calldata = data; 2810 struct nfs4_state_owner *sp = calldata->state->owner; 2811 struct super_block *sb = calldata->state->inode->i_sb; 2812 2813 if (calldata->roc) 2814 pnfs_roc_release(calldata->state->inode); 2815 nfs4_put_open_state(calldata->state); 2816 nfs_free_seqid(calldata->arg.seqid); 2817 nfs4_put_state_owner(sp); 2818 nfs_sb_deactive(sb); 2819 kfree(calldata); 2820 } 2821 2822 static void nfs4_close_done(struct rpc_task *task, void *data) 2823 { 2824 struct nfs4_closedata *calldata = data; 2825 struct nfs4_state *state = calldata->state; 2826 struct nfs_server *server = NFS_SERVER(calldata->inode); 2827 nfs4_stateid *res_stateid = NULL; 2828 2829 dprintk("%s: begin!\n", __func__); 2830 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2831 return; 2832 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 2833 /* hmm. we are done with the inode, and in the process of freeing 2834 * the state_owner. we keep this around to process errors 2835 */ 2836 switch (task->tk_status) { 2837 case 0: 2838 res_stateid = &calldata->res.stateid; 2839 if (calldata->roc) 2840 pnfs_roc_set_barrier(state->inode, 2841 calldata->roc_barrier); 2842 renew_lease(server, calldata->timestamp); 2843 break; 2844 case -NFS4ERR_ADMIN_REVOKED: 2845 case -NFS4ERR_STALE_STATEID: 2846 case -NFS4ERR_OLD_STATEID: 2847 case -NFS4ERR_BAD_STATEID: 2848 case -NFS4ERR_EXPIRED: 2849 if (!nfs4_stateid_match(&calldata->arg.stateid, 2850 &state->open_stateid)) { 2851 rpc_restart_call_prepare(task); 2852 goto out_release; 2853 } 2854 if (calldata->arg.fmode == 0) 2855 break; 2856 default: 2857 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) { 2858 rpc_restart_call_prepare(task); 2859 goto out_release; 2860 } 2861 } 2862 nfs_clear_open_stateid(state, &calldata->arg.stateid, 2863 res_stateid, calldata->arg.fmode); 2864 out_release: 2865 nfs_release_seqid(calldata->arg.seqid); 2866 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2867 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2868 } 2869 2870 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2871 { 2872 struct nfs4_closedata *calldata = data; 2873 struct nfs4_state *state = calldata->state; 2874 struct inode *inode = calldata->inode; 2875 bool is_rdonly, is_wronly, is_rdwr; 2876 int call_close = 0; 2877 2878 dprintk("%s: begin!\n", __func__); 2879 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2880 goto out_wait; 2881 2882 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2883 spin_lock(&state->owner->so_lock); 2884 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 2885 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 2886 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 2887 nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid); 2888 /* Calculate the change in open mode */ 2889 calldata->arg.fmode = 0; 2890 if (state->n_rdwr == 0) { 2891 if (state->n_rdonly == 0) 2892 call_close |= is_rdonly; 2893 else if (is_rdonly) 2894 calldata->arg.fmode |= FMODE_READ; 2895 if (state->n_wronly == 0) 2896 call_close |= is_wronly; 2897 else if (is_wronly) 2898 calldata->arg.fmode |= FMODE_WRITE; 2899 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 2900 call_close |= is_rdwr; 2901 } else if (is_rdwr) 2902 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 2903 2904 if (!nfs4_valid_open_stateid(state)) 2905 call_close = 0; 2906 spin_unlock(&state->owner->so_lock); 2907 2908 if (!call_close) { 2909 /* Note: exit _without_ calling nfs4_close_done */ 2910 goto out_no_action; 2911 } 2912 2913 if (nfs4_wait_on_layoutreturn(inode, task)) { 2914 nfs_release_seqid(calldata->arg.seqid); 2915 goto out_wait; 2916 } 2917 2918 if (calldata->arg.fmode == 0) 2919 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2920 if (calldata->roc) 2921 pnfs_roc_get_barrier(inode, &calldata->roc_barrier); 2922 2923 calldata->arg.share_access = 2924 nfs4_map_atomic_open_share(NFS_SERVER(inode), 2925 calldata->arg.fmode, 0); 2926 2927 nfs_fattr_init(calldata->res.fattr); 2928 calldata->timestamp = jiffies; 2929 if (nfs4_setup_sequence(NFS_SERVER(inode), 2930 &calldata->arg.seq_args, 2931 &calldata->res.seq_res, 2932 task) != 0) 2933 nfs_release_seqid(calldata->arg.seqid); 2934 dprintk("%s: done!\n", __func__); 2935 return; 2936 out_no_action: 2937 task->tk_action = NULL; 2938 out_wait: 2939 nfs4_sequence_done(task, &calldata->res.seq_res); 2940 } 2941 2942 static const struct rpc_call_ops nfs4_close_ops = { 2943 .rpc_call_prepare = nfs4_close_prepare, 2944 .rpc_call_done = nfs4_close_done, 2945 .rpc_release = nfs4_free_closedata, 2946 }; 2947 2948 static bool nfs4_roc(struct inode *inode) 2949 { 2950 if (!nfs_have_layout(inode)) 2951 return false; 2952 return pnfs_roc(inode); 2953 } 2954 2955 /* 2956 * It is possible for data to be read/written from a mem-mapped file 2957 * after the sys_close call (which hits the vfs layer as a flush). 2958 * This means that we can't safely call nfsv4 close on a file until 2959 * the inode is cleared. This in turn means that we are not good 2960 * NFSv4 citizens - we do not indicate to the server to update the file's 2961 * share state even when we are done with one of the three share 2962 * stateid's in the inode. 2963 * 2964 * NOTE: Caller must be holding the sp->so_owner semaphore! 2965 */ 2966 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2967 { 2968 struct nfs_server *server = NFS_SERVER(state->inode); 2969 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 2970 struct nfs4_closedata *calldata; 2971 struct nfs4_state_owner *sp = state->owner; 2972 struct rpc_task *task; 2973 struct rpc_message msg = { 2974 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2975 .rpc_cred = state->owner->so_cred, 2976 }; 2977 struct rpc_task_setup task_setup_data = { 2978 .rpc_client = server->client, 2979 .rpc_message = &msg, 2980 .callback_ops = &nfs4_close_ops, 2981 .workqueue = nfsiod_workqueue, 2982 .flags = RPC_TASK_ASYNC, 2983 }; 2984 int status = -ENOMEM; 2985 2986 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 2987 &task_setup_data.rpc_client, &msg); 2988 2989 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2990 if (calldata == NULL) 2991 goto out; 2992 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2993 calldata->inode = state->inode; 2994 calldata->state = state; 2995 calldata->arg.fh = NFS_FH(state->inode); 2996 /* Serialization for the sequence id */ 2997 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 2998 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 2999 if (IS_ERR(calldata->arg.seqid)) 3000 goto out_free_calldata; 3001 calldata->arg.fmode = 0; 3002 calldata->arg.bitmask = server->cache_consistency_bitmask; 3003 calldata->res.fattr = &calldata->fattr; 3004 calldata->res.seqid = calldata->arg.seqid; 3005 calldata->res.server = server; 3006 calldata->roc = nfs4_roc(state->inode); 3007 nfs_sb_active(calldata->inode->i_sb); 3008 3009 msg.rpc_argp = &calldata->arg; 3010 msg.rpc_resp = &calldata->res; 3011 task_setup_data.callback_data = calldata; 3012 task = rpc_run_task(&task_setup_data); 3013 if (IS_ERR(task)) 3014 return PTR_ERR(task); 3015 status = 0; 3016 if (wait) 3017 status = rpc_wait_for_completion_task(task); 3018 rpc_put_task(task); 3019 return status; 3020 out_free_calldata: 3021 kfree(calldata); 3022 out: 3023 nfs4_put_open_state(state); 3024 nfs4_put_state_owner(sp); 3025 return status; 3026 } 3027 3028 static struct inode * 3029 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3030 int open_flags, struct iattr *attr, int *opened) 3031 { 3032 struct nfs4_state *state; 3033 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 3034 3035 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3036 3037 /* Protect against concurrent sillydeletes */ 3038 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3039 3040 nfs4_label_release_security(label); 3041 3042 if (IS_ERR(state)) 3043 return ERR_CAST(state); 3044 return state->inode; 3045 } 3046 3047 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3048 { 3049 if (ctx->state == NULL) 3050 return; 3051 if (is_sync) 3052 nfs4_close_sync(ctx->state, ctx->mode); 3053 else 3054 nfs4_close_state(ctx->state, ctx->mode); 3055 } 3056 3057 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3058 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3059 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL) 3060 3061 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3062 { 3063 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3064 struct nfs4_server_caps_arg args = { 3065 .fhandle = fhandle, 3066 .bitmask = bitmask, 3067 }; 3068 struct nfs4_server_caps_res res = {}; 3069 struct rpc_message msg = { 3070 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3071 .rpc_argp = &args, 3072 .rpc_resp = &res, 3073 }; 3074 int status; 3075 3076 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3077 FATTR4_WORD0_FH_EXPIRE_TYPE | 3078 FATTR4_WORD0_LINK_SUPPORT | 3079 FATTR4_WORD0_SYMLINK_SUPPORT | 3080 FATTR4_WORD0_ACLSUPPORT; 3081 if (minorversion) 3082 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3083 3084 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3085 if (status == 0) { 3086 /* Sanity check the server answers */ 3087 switch (minorversion) { 3088 case 0: 3089 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3090 res.attr_bitmask[2] = 0; 3091 break; 3092 case 1: 3093 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3094 break; 3095 case 2: 3096 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3097 } 3098 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3099 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3100 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3101 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3102 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3103 NFS_CAP_CTIME|NFS_CAP_MTIME| 3104 NFS_CAP_SECURITY_LABEL); 3105 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3106 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3107 server->caps |= NFS_CAP_ACLS; 3108 if (res.has_links != 0) 3109 server->caps |= NFS_CAP_HARDLINKS; 3110 if (res.has_symlinks != 0) 3111 server->caps |= NFS_CAP_SYMLINKS; 3112 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3113 server->caps |= NFS_CAP_FILEID; 3114 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3115 server->caps |= NFS_CAP_MODE; 3116 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3117 server->caps |= NFS_CAP_NLINK; 3118 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3119 server->caps |= NFS_CAP_OWNER; 3120 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3121 server->caps |= NFS_CAP_OWNER_GROUP; 3122 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3123 server->caps |= NFS_CAP_ATIME; 3124 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3125 server->caps |= NFS_CAP_CTIME; 3126 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3127 server->caps |= NFS_CAP_MTIME; 3128 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3129 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3130 server->caps |= NFS_CAP_SECURITY_LABEL; 3131 #endif 3132 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3133 sizeof(server->attr_bitmask)); 3134 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3135 3136 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3137 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3138 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3139 server->cache_consistency_bitmask[2] = 0; 3140 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3141 sizeof(server->exclcreat_bitmask)); 3142 server->acl_bitmask = res.acl_bitmask; 3143 server->fh_expire_type = res.fh_expire_type; 3144 } 3145 3146 return status; 3147 } 3148 3149 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3150 { 3151 struct nfs4_exception exception = { }; 3152 int err; 3153 do { 3154 err = nfs4_handle_exception(server, 3155 _nfs4_server_capabilities(server, fhandle), 3156 &exception); 3157 } while (exception.retry); 3158 return err; 3159 } 3160 3161 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3162 struct nfs_fsinfo *info) 3163 { 3164 u32 bitmask[3]; 3165 struct nfs4_lookup_root_arg args = { 3166 .bitmask = bitmask, 3167 }; 3168 struct nfs4_lookup_res res = { 3169 .server = server, 3170 .fattr = info->fattr, 3171 .fh = fhandle, 3172 }; 3173 struct rpc_message msg = { 3174 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3175 .rpc_argp = &args, 3176 .rpc_resp = &res, 3177 }; 3178 3179 bitmask[0] = nfs4_fattr_bitmap[0]; 3180 bitmask[1] = nfs4_fattr_bitmap[1]; 3181 /* 3182 * Process the label in the upcoming getfattr 3183 */ 3184 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3185 3186 nfs_fattr_init(info->fattr); 3187 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3188 } 3189 3190 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3191 struct nfs_fsinfo *info) 3192 { 3193 struct nfs4_exception exception = { }; 3194 int err; 3195 do { 3196 err = _nfs4_lookup_root(server, fhandle, info); 3197 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3198 switch (err) { 3199 case 0: 3200 case -NFS4ERR_WRONGSEC: 3201 goto out; 3202 default: 3203 err = nfs4_handle_exception(server, err, &exception); 3204 } 3205 } while (exception.retry); 3206 out: 3207 return err; 3208 } 3209 3210 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3211 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3212 { 3213 struct rpc_auth_create_args auth_args = { 3214 .pseudoflavor = flavor, 3215 }; 3216 struct rpc_auth *auth; 3217 int ret; 3218 3219 auth = rpcauth_create(&auth_args, server->client); 3220 if (IS_ERR(auth)) { 3221 ret = -EACCES; 3222 goto out; 3223 } 3224 ret = nfs4_lookup_root(server, fhandle, info); 3225 out: 3226 return ret; 3227 } 3228 3229 /* 3230 * Retry pseudoroot lookup with various security flavors. We do this when: 3231 * 3232 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3233 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3234 * 3235 * Returns zero on success, or a negative NFS4ERR value, or a 3236 * negative errno value. 3237 */ 3238 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3239 struct nfs_fsinfo *info) 3240 { 3241 /* Per 3530bis 15.33.5 */ 3242 static const rpc_authflavor_t flav_array[] = { 3243 RPC_AUTH_GSS_KRB5P, 3244 RPC_AUTH_GSS_KRB5I, 3245 RPC_AUTH_GSS_KRB5, 3246 RPC_AUTH_UNIX, /* courtesy */ 3247 RPC_AUTH_NULL, 3248 }; 3249 int status = -EPERM; 3250 size_t i; 3251 3252 if (server->auth_info.flavor_len > 0) { 3253 /* try each flavor specified by user */ 3254 for (i = 0; i < server->auth_info.flavor_len; i++) { 3255 status = nfs4_lookup_root_sec(server, fhandle, info, 3256 server->auth_info.flavors[i]); 3257 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3258 continue; 3259 break; 3260 } 3261 } else { 3262 /* no flavors specified by user, try default list */ 3263 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3264 status = nfs4_lookup_root_sec(server, fhandle, info, 3265 flav_array[i]); 3266 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3267 continue; 3268 break; 3269 } 3270 } 3271 3272 /* 3273 * -EACCESS could mean that the user doesn't have correct permissions 3274 * to access the mount. It could also mean that we tried to mount 3275 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3276 * existing mount programs don't handle -EACCES very well so it should 3277 * be mapped to -EPERM instead. 3278 */ 3279 if (status == -EACCES) 3280 status = -EPERM; 3281 return status; 3282 } 3283 3284 /** 3285 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3286 * @server: initialized nfs_server handle 3287 * @fhandle: we fill in the pseudo-fs root file handle 3288 * @info: we fill in an FSINFO struct 3289 * @auth_probe: probe the auth flavours 3290 * 3291 * Returns zero on success, or a negative errno. 3292 */ 3293 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3294 struct nfs_fsinfo *info, 3295 bool auth_probe) 3296 { 3297 int status = 0; 3298 3299 if (!auth_probe) 3300 status = nfs4_lookup_root(server, fhandle, info); 3301 3302 if (auth_probe || status == NFS4ERR_WRONGSEC) 3303 status = server->nfs_client->cl_mvops->find_root_sec(server, 3304 fhandle, info); 3305 3306 if (status == 0) 3307 status = nfs4_server_capabilities(server, fhandle); 3308 if (status == 0) 3309 status = nfs4_do_fsinfo(server, fhandle, info); 3310 3311 return nfs4_map_errors(status); 3312 } 3313 3314 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3315 struct nfs_fsinfo *info) 3316 { 3317 int error; 3318 struct nfs_fattr *fattr = info->fattr; 3319 struct nfs4_label *label = NULL; 3320 3321 error = nfs4_server_capabilities(server, mntfh); 3322 if (error < 0) { 3323 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3324 return error; 3325 } 3326 3327 label = nfs4_label_alloc(server, GFP_KERNEL); 3328 if (IS_ERR(label)) 3329 return PTR_ERR(label); 3330 3331 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3332 if (error < 0) { 3333 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3334 goto err_free_label; 3335 } 3336 3337 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3338 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3339 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3340 3341 err_free_label: 3342 nfs4_label_free(label); 3343 3344 return error; 3345 } 3346 3347 /* 3348 * Get locations and (maybe) other attributes of a referral. 3349 * Note that we'll actually follow the referral later when 3350 * we detect fsid mismatch in inode revalidation 3351 */ 3352 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3353 const struct qstr *name, struct nfs_fattr *fattr, 3354 struct nfs_fh *fhandle) 3355 { 3356 int status = -ENOMEM; 3357 struct page *page = NULL; 3358 struct nfs4_fs_locations *locations = NULL; 3359 3360 page = alloc_page(GFP_KERNEL); 3361 if (page == NULL) 3362 goto out; 3363 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3364 if (locations == NULL) 3365 goto out; 3366 3367 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3368 if (status != 0) 3369 goto out; 3370 3371 /* 3372 * If the fsid didn't change, this is a migration event, not a 3373 * referral. Cause us to drop into the exception handler, which 3374 * will kick off migration recovery. 3375 */ 3376 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3377 dprintk("%s: server did not return a different fsid for" 3378 " a referral at %s\n", __func__, name->name); 3379 status = -NFS4ERR_MOVED; 3380 goto out; 3381 } 3382 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3383 nfs_fixup_referral_attributes(&locations->fattr); 3384 3385 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3386 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3387 memset(fhandle, 0, sizeof(struct nfs_fh)); 3388 out: 3389 if (page) 3390 __free_page(page); 3391 kfree(locations); 3392 return status; 3393 } 3394 3395 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3396 struct nfs_fattr *fattr, struct nfs4_label *label) 3397 { 3398 struct nfs4_getattr_arg args = { 3399 .fh = fhandle, 3400 .bitmask = server->attr_bitmask, 3401 }; 3402 struct nfs4_getattr_res res = { 3403 .fattr = fattr, 3404 .label = label, 3405 .server = server, 3406 }; 3407 struct rpc_message msg = { 3408 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3409 .rpc_argp = &args, 3410 .rpc_resp = &res, 3411 }; 3412 3413 args.bitmask = nfs4_bitmask(server, label); 3414 3415 nfs_fattr_init(fattr); 3416 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3417 } 3418 3419 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3420 struct nfs_fattr *fattr, struct nfs4_label *label) 3421 { 3422 struct nfs4_exception exception = { }; 3423 int err; 3424 do { 3425 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3426 trace_nfs4_getattr(server, fhandle, fattr, err); 3427 err = nfs4_handle_exception(server, err, 3428 &exception); 3429 } while (exception.retry); 3430 return err; 3431 } 3432 3433 /* 3434 * The file is not closed if it is opened due to the a request to change 3435 * the size of the file. The open call will not be needed once the 3436 * VFS layer lookup-intents are implemented. 3437 * 3438 * Close is called when the inode is destroyed. 3439 * If we haven't opened the file for O_WRONLY, we 3440 * need to in the size_change case to obtain a stateid. 3441 * 3442 * Got race? 3443 * Because OPEN is always done by name in nfsv4, it is 3444 * possible that we opened a different file by the same 3445 * name. We can recognize this race condition, but we 3446 * can't do anything about it besides returning an error. 3447 * 3448 * This will be fixed with VFS changes (lookup-intent). 3449 */ 3450 static int 3451 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3452 struct iattr *sattr) 3453 { 3454 struct inode *inode = d_inode(dentry); 3455 struct rpc_cred *cred = NULL; 3456 struct nfs4_state *state = NULL; 3457 struct nfs4_label *label = NULL; 3458 int status; 3459 3460 if (pnfs_ld_layoutret_on_setattr(inode) && 3461 sattr->ia_valid & ATTR_SIZE && 3462 sattr->ia_size < i_size_read(inode)) 3463 pnfs_commit_and_return_layout(inode); 3464 3465 nfs_fattr_init(fattr); 3466 3467 /* Deal with open(O_TRUNC) */ 3468 if (sattr->ia_valid & ATTR_OPEN) 3469 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3470 3471 /* Optimization: if the end result is no change, don't RPC */ 3472 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3473 return 0; 3474 3475 /* Search for an existing open(O_WRITE) file */ 3476 if (sattr->ia_valid & ATTR_FILE) { 3477 struct nfs_open_context *ctx; 3478 3479 ctx = nfs_file_open_context(sattr->ia_file); 3480 if (ctx) { 3481 cred = ctx->cred; 3482 state = ctx->state; 3483 } 3484 } 3485 3486 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3487 if (IS_ERR(label)) 3488 return PTR_ERR(label); 3489 3490 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label); 3491 if (status == 0) { 3492 nfs_setattr_update_inode(inode, sattr, fattr); 3493 nfs_setsecurity(inode, fattr, label); 3494 } 3495 nfs4_label_free(label); 3496 return status; 3497 } 3498 3499 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3500 const struct qstr *name, struct nfs_fh *fhandle, 3501 struct nfs_fattr *fattr, struct nfs4_label *label) 3502 { 3503 struct nfs_server *server = NFS_SERVER(dir); 3504 int status; 3505 struct nfs4_lookup_arg args = { 3506 .bitmask = server->attr_bitmask, 3507 .dir_fh = NFS_FH(dir), 3508 .name = name, 3509 }; 3510 struct nfs4_lookup_res res = { 3511 .server = server, 3512 .fattr = fattr, 3513 .label = label, 3514 .fh = fhandle, 3515 }; 3516 struct rpc_message msg = { 3517 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3518 .rpc_argp = &args, 3519 .rpc_resp = &res, 3520 }; 3521 3522 args.bitmask = nfs4_bitmask(server, label); 3523 3524 nfs_fattr_init(fattr); 3525 3526 dprintk("NFS call lookup %s\n", name->name); 3527 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3528 dprintk("NFS reply lookup: %d\n", status); 3529 return status; 3530 } 3531 3532 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3533 { 3534 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3535 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3536 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3537 fattr->nlink = 2; 3538 } 3539 3540 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3541 const struct qstr *name, struct nfs_fh *fhandle, 3542 struct nfs_fattr *fattr, struct nfs4_label *label) 3543 { 3544 struct nfs4_exception exception = { }; 3545 struct rpc_clnt *client = *clnt; 3546 int err; 3547 do { 3548 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3549 trace_nfs4_lookup(dir, name, err); 3550 switch (err) { 3551 case -NFS4ERR_BADNAME: 3552 err = -ENOENT; 3553 goto out; 3554 case -NFS4ERR_MOVED: 3555 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3556 if (err == -NFS4ERR_MOVED) 3557 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3558 goto out; 3559 case -NFS4ERR_WRONGSEC: 3560 err = -EPERM; 3561 if (client != *clnt) 3562 goto out; 3563 client = nfs4_negotiate_security(client, dir, name); 3564 if (IS_ERR(client)) 3565 return PTR_ERR(client); 3566 3567 exception.retry = 1; 3568 break; 3569 default: 3570 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3571 } 3572 } while (exception.retry); 3573 3574 out: 3575 if (err == 0) 3576 *clnt = client; 3577 else if (client != *clnt) 3578 rpc_shutdown_client(client); 3579 3580 return err; 3581 } 3582 3583 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 3584 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3585 struct nfs4_label *label) 3586 { 3587 int status; 3588 struct rpc_clnt *client = NFS_CLIENT(dir); 3589 3590 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3591 if (client != NFS_CLIENT(dir)) { 3592 rpc_shutdown_client(client); 3593 nfs_fixup_secinfo_attributes(fattr); 3594 } 3595 return status; 3596 } 3597 3598 struct rpc_clnt * 3599 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name, 3600 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3601 { 3602 struct rpc_clnt *client = NFS_CLIENT(dir); 3603 int status; 3604 3605 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3606 if (status < 0) 3607 return ERR_PTR(status); 3608 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3609 } 3610 3611 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3612 { 3613 struct nfs_server *server = NFS_SERVER(inode); 3614 struct nfs4_accessargs args = { 3615 .fh = NFS_FH(inode), 3616 .bitmask = server->cache_consistency_bitmask, 3617 }; 3618 struct nfs4_accessres res = { 3619 .server = server, 3620 }; 3621 struct rpc_message msg = { 3622 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 3623 .rpc_argp = &args, 3624 .rpc_resp = &res, 3625 .rpc_cred = entry->cred, 3626 }; 3627 int mode = entry->mask; 3628 int status = 0; 3629 3630 /* 3631 * Determine which access bits we want to ask for... 3632 */ 3633 if (mode & MAY_READ) 3634 args.access |= NFS4_ACCESS_READ; 3635 if (S_ISDIR(inode->i_mode)) { 3636 if (mode & MAY_WRITE) 3637 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 3638 if (mode & MAY_EXEC) 3639 args.access |= NFS4_ACCESS_LOOKUP; 3640 } else { 3641 if (mode & MAY_WRITE) 3642 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 3643 if (mode & MAY_EXEC) 3644 args.access |= NFS4_ACCESS_EXECUTE; 3645 } 3646 3647 res.fattr = nfs_alloc_fattr(); 3648 if (res.fattr == NULL) 3649 return -ENOMEM; 3650 3651 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3652 if (!status) { 3653 nfs_access_set_mask(entry, res.access); 3654 nfs_refresh_inode(inode, res.fattr); 3655 } 3656 nfs_free_fattr(res.fattr); 3657 return status; 3658 } 3659 3660 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3661 { 3662 struct nfs4_exception exception = { }; 3663 int err; 3664 do { 3665 err = _nfs4_proc_access(inode, entry); 3666 trace_nfs4_access(inode, err); 3667 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3668 &exception); 3669 } while (exception.retry); 3670 return err; 3671 } 3672 3673 /* 3674 * TODO: For the time being, we don't try to get any attributes 3675 * along with any of the zero-copy operations READ, READDIR, 3676 * READLINK, WRITE. 3677 * 3678 * In the case of the first three, we want to put the GETATTR 3679 * after the read-type operation -- this is because it is hard 3680 * to predict the length of a GETATTR response in v4, and thus 3681 * align the READ data correctly. This means that the GETATTR 3682 * may end up partially falling into the page cache, and we should 3683 * shift it into the 'tail' of the xdr_buf before processing. 3684 * To do this efficiently, we need to know the total length 3685 * of data received, which doesn't seem to be available outside 3686 * of the RPC layer. 3687 * 3688 * In the case of WRITE, we also want to put the GETATTR after 3689 * the operation -- in this case because we want to make sure 3690 * we get the post-operation mtime and size. 3691 * 3692 * Both of these changes to the XDR layer would in fact be quite 3693 * minor, but I decided to leave them for a subsequent patch. 3694 */ 3695 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 3696 unsigned int pgbase, unsigned int pglen) 3697 { 3698 struct nfs4_readlink args = { 3699 .fh = NFS_FH(inode), 3700 .pgbase = pgbase, 3701 .pglen = pglen, 3702 .pages = &page, 3703 }; 3704 struct nfs4_readlink_res res; 3705 struct rpc_message msg = { 3706 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 3707 .rpc_argp = &args, 3708 .rpc_resp = &res, 3709 }; 3710 3711 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 3712 } 3713 3714 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 3715 unsigned int pgbase, unsigned int pglen) 3716 { 3717 struct nfs4_exception exception = { }; 3718 int err; 3719 do { 3720 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 3721 trace_nfs4_readlink(inode, err); 3722 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3723 &exception); 3724 } while (exception.retry); 3725 return err; 3726 } 3727 3728 /* 3729 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 3730 */ 3731 static int 3732 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 3733 int flags) 3734 { 3735 struct nfs4_label l, *ilabel = NULL; 3736 struct nfs_open_context *ctx; 3737 struct nfs4_state *state; 3738 int status = 0; 3739 3740 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 3741 if (IS_ERR(ctx)) 3742 return PTR_ERR(ctx); 3743 3744 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 3745 3746 sattr->ia_mode &= ~current_umask(); 3747 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 3748 if (IS_ERR(state)) { 3749 status = PTR_ERR(state); 3750 goto out; 3751 } 3752 out: 3753 nfs4_label_release_security(ilabel); 3754 put_nfs_open_context(ctx); 3755 return status; 3756 } 3757 3758 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) 3759 { 3760 struct nfs_server *server = NFS_SERVER(dir); 3761 struct nfs_removeargs args = { 3762 .fh = NFS_FH(dir), 3763 .name = *name, 3764 }; 3765 struct nfs_removeres res = { 3766 .server = server, 3767 }; 3768 struct rpc_message msg = { 3769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 3770 .rpc_argp = &args, 3771 .rpc_resp = &res, 3772 }; 3773 int status; 3774 3775 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 3776 if (status == 0) 3777 update_changeattr(dir, &res.cinfo); 3778 return status; 3779 } 3780 3781 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name) 3782 { 3783 struct nfs4_exception exception = { }; 3784 int err; 3785 do { 3786 err = _nfs4_proc_remove(dir, name); 3787 trace_nfs4_remove(dir, name, err); 3788 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3789 &exception); 3790 } while (exception.retry); 3791 return err; 3792 } 3793 3794 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 3795 { 3796 struct nfs_server *server = NFS_SERVER(dir); 3797 struct nfs_removeargs *args = msg->rpc_argp; 3798 struct nfs_removeres *res = msg->rpc_resp; 3799 3800 res->server = server; 3801 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 3802 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 3803 3804 nfs_fattr_init(res->dir_attr); 3805 } 3806 3807 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 3808 { 3809 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb), 3810 &data->args.seq_args, 3811 &data->res.seq_res, 3812 task); 3813 } 3814 3815 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 3816 { 3817 struct nfs_unlinkdata *data = task->tk_calldata; 3818 struct nfs_removeres *res = &data->res; 3819 3820 if (!nfs4_sequence_done(task, &res->seq_res)) 3821 return 0; 3822 if (nfs4_async_handle_error(task, res->server, NULL, 3823 &data->timeout) == -EAGAIN) 3824 return 0; 3825 update_changeattr(dir, &res->cinfo); 3826 return 1; 3827 } 3828 3829 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 3830 { 3831 struct nfs_server *server = NFS_SERVER(dir); 3832 struct nfs_renameargs *arg = msg->rpc_argp; 3833 struct nfs_renameres *res = msg->rpc_resp; 3834 3835 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 3836 res->server = server; 3837 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 3838 } 3839 3840 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 3841 { 3842 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 3843 &data->args.seq_args, 3844 &data->res.seq_res, 3845 task); 3846 } 3847 3848 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 3849 struct inode *new_dir) 3850 { 3851 struct nfs_renamedata *data = task->tk_calldata; 3852 struct nfs_renameres *res = &data->res; 3853 3854 if (!nfs4_sequence_done(task, &res->seq_res)) 3855 return 0; 3856 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 3857 return 0; 3858 3859 update_changeattr(old_dir, &res->old_cinfo); 3860 update_changeattr(new_dir, &res->new_cinfo); 3861 return 1; 3862 } 3863 3864 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 3865 { 3866 struct nfs_server *server = NFS_SERVER(inode); 3867 struct nfs4_link_arg arg = { 3868 .fh = NFS_FH(inode), 3869 .dir_fh = NFS_FH(dir), 3870 .name = name, 3871 .bitmask = server->attr_bitmask, 3872 }; 3873 struct nfs4_link_res res = { 3874 .server = server, 3875 .label = NULL, 3876 }; 3877 struct rpc_message msg = { 3878 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3879 .rpc_argp = &arg, 3880 .rpc_resp = &res, 3881 }; 3882 int status = -ENOMEM; 3883 3884 res.fattr = nfs_alloc_fattr(); 3885 if (res.fattr == NULL) 3886 goto out; 3887 3888 res.label = nfs4_label_alloc(server, GFP_KERNEL); 3889 if (IS_ERR(res.label)) { 3890 status = PTR_ERR(res.label); 3891 goto out; 3892 } 3893 arg.bitmask = nfs4_bitmask(server, res.label); 3894 3895 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3896 if (!status) { 3897 update_changeattr(dir, &res.cinfo); 3898 status = nfs_post_op_update_inode(inode, res.fattr); 3899 if (!status) 3900 nfs_setsecurity(inode, res.fattr, res.label); 3901 } 3902 3903 3904 nfs4_label_free(res.label); 3905 3906 out: 3907 nfs_free_fattr(res.fattr); 3908 return status; 3909 } 3910 3911 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 3912 { 3913 struct nfs4_exception exception = { }; 3914 int err; 3915 do { 3916 err = nfs4_handle_exception(NFS_SERVER(inode), 3917 _nfs4_proc_link(inode, dir, name), 3918 &exception); 3919 } while (exception.retry); 3920 return err; 3921 } 3922 3923 struct nfs4_createdata { 3924 struct rpc_message msg; 3925 struct nfs4_create_arg arg; 3926 struct nfs4_create_res res; 3927 struct nfs_fh fh; 3928 struct nfs_fattr fattr; 3929 struct nfs4_label *label; 3930 }; 3931 3932 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3933 const struct qstr *name, struct iattr *sattr, u32 ftype) 3934 { 3935 struct nfs4_createdata *data; 3936 3937 data = kzalloc(sizeof(*data), GFP_KERNEL); 3938 if (data != NULL) { 3939 struct nfs_server *server = NFS_SERVER(dir); 3940 3941 data->label = nfs4_label_alloc(server, GFP_KERNEL); 3942 if (IS_ERR(data->label)) 3943 goto out_free; 3944 3945 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3946 data->msg.rpc_argp = &data->arg; 3947 data->msg.rpc_resp = &data->res; 3948 data->arg.dir_fh = NFS_FH(dir); 3949 data->arg.server = server; 3950 data->arg.name = name; 3951 data->arg.attrs = sattr; 3952 data->arg.ftype = ftype; 3953 data->arg.bitmask = nfs4_bitmask(server, data->label); 3954 data->res.server = server; 3955 data->res.fh = &data->fh; 3956 data->res.fattr = &data->fattr; 3957 data->res.label = data->label; 3958 nfs_fattr_init(data->res.fattr); 3959 } 3960 return data; 3961 out_free: 3962 kfree(data); 3963 return NULL; 3964 } 3965 3966 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3967 { 3968 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3969 &data->arg.seq_args, &data->res.seq_res, 1); 3970 if (status == 0) { 3971 update_changeattr(dir, &data->res.dir_cinfo); 3972 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 3973 } 3974 return status; 3975 } 3976 3977 static void nfs4_free_createdata(struct nfs4_createdata *data) 3978 { 3979 nfs4_label_free(data->label); 3980 kfree(data); 3981 } 3982 3983 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3984 struct page *page, unsigned int len, struct iattr *sattr, 3985 struct nfs4_label *label) 3986 { 3987 struct nfs4_createdata *data; 3988 int status = -ENAMETOOLONG; 3989 3990 if (len > NFS4_MAXPATHLEN) 3991 goto out; 3992 3993 status = -ENOMEM; 3994 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3995 if (data == NULL) 3996 goto out; 3997 3998 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3999 data->arg.u.symlink.pages = &page; 4000 data->arg.u.symlink.len = len; 4001 data->arg.label = label; 4002 4003 status = nfs4_do_create(dir, dentry, data); 4004 4005 nfs4_free_createdata(data); 4006 out: 4007 return status; 4008 } 4009 4010 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 4011 struct page *page, unsigned int len, struct iattr *sattr) 4012 { 4013 struct nfs4_exception exception = { }; 4014 struct nfs4_label l, *label = NULL; 4015 int err; 4016 4017 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4018 4019 do { 4020 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 4021 trace_nfs4_symlink(dir, &dentry->d_name, err); 4022 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4023 &exception); 4024 } while (exception.retry); 4025 4026 nfs4_label_release_security(label); 4027 return err; 4028 } 4029 4030 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4031 struct iattr *sattr, struct nfs4_label *label) 4032 { 4033 struct nfs4_createdata *data; 4034 int status = -ENOMEM; 4035 4036 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4037 if (data == NULL) 4038 goto out; 4039 4040 data->arg.label = label; 4041 status = nfs4_do_create(dir, dentry, data); 4042 4043 nfs4_free_createdata(data); 4044 out: 4045 return status; 4046 } 4047 4048 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4049 struct iattr *sattr) 4050 { 4051 struct nfs4_exception exception = { }; 4052 struct nfs4_label l, *label = NULL; 4053 int err; 4054 4055 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4056 4057 sattr->ia_mode &= ~current_umask(); 4058 do { 4059 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4060 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4061 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4062 &exception); 4063 } while (exception.retry); 4064 nfs4_label_release_security(label); 4065 4066 return err; 4067 } 4068 4069 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4070 u64 cookie, struct page **pages, unsigned int count, int plus) 4071 { 4072 struct inode *dir = d_inode(dentry); 4073 struct nfs4_readdir_arg args = { 4074 .fh = NFS_FH(dir), 4075 .pages = pages, 4076 .pgbase = 0, 4077 .count = count, 4078 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4079 .plus = plus, 4080 }; 4081 struct nfs4_readdir_res res; 4082 struct rpc_message msg = { 4083 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4084 .rpc_argp = &args, 4085 .rpc_resp = &res, 4086 .rpc_cred = cred, 4087 }; 4088 int status; 4089 4090 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4091 dentry, 4092 (unsigned long long)cookie); 4093 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4094 res.pgbase = args.pgbase; 4095 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4096 if (status >= 0) { 4097 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4098 status += args.pgbase; 4099 } 4100 4101 nfs_invalidate_atime(dir); 4102 4103 dprintk("%s: returns %d\n", __func__, status); 4104 return status; 4105 } 4106 4107 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4108 u64 cookie, struct page **pages, unsigned int count, int plus) 4109 { 4110 struct nfs4_exception exception = { }; 4111 int err; 4112 do { 4113 err = _nfs4_proc_readdir(dentry, cred, cookie, 4114 pages, count, plus); 4115 trace_nfs4_readdir(d_inode(dentry), err); 4116 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4117 &exception); 4118 } while (exception.retry); 4119 return err; 4120 } 4121 4122 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4123 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4124 { 4125 struct nfs4_createdata *data; 4126 int mode = sattr->ia_mode; 4127 int status = -ENOMEM; 4128 4129 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4130 if (data == NULL) 4131 goto out; 4132 4133 if (S_ISFIFO(mode)) 4134 data->arg.ftype = NF4FIFO; 4135 else if (S_ISBLK(mode)) { 4136 data->arg.ftype = NF4BLK; 4137 data->arg.u.device.specdata1 = MAJOR(rdev); 4138 data->arg.u.device.specdata2 = MINOR(rdev); 4139 } 4140 else if (S_ISCHR(mode)) { 4141 data->arg.ftype = NF4CHR; 4142 data->arg.u.device.specdata1 = MAJOR(rdev); 4143 data->arg.u.device.specdata2 = MINOR(rdev); 4144 } else if (!S_ISSOCK(mode)) { 4145 status = -EINVAL; 4146 goto out_free; 4147 } 4148 4149 data->arg.label = label; 4150 status = nfs4_do_create(dir, dentry, data); 4151 out_free: 4152 nfs4_free_createdata(data); 4153 out: 4154 return status; 4155 } 4156 4157 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4158 struct iattr *sattr, dev_t rdev) 4159 { 4160 struct nfs4_exception exception = { }; 4161 struct nfs4_label l, *label = NULL; 4162 int err; 4163 4164 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4165 4166 sattr->ia_mode &= ~current_umask(); 4167 do { 4168 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 4169 trace_nfs4_mknod(dir, &dentry->d_name, err); 4170 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4171 &exception); 4172 } while (exception.retry); 4173 4174 nfs4_label_release_security(label); 4175 4176 return err; 4177 } 4178 4179 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 4180 struct nfs_fsstat *fsstat) 4181 { 4182 struct nfs4_statfs_arg args = { 4183 .fh = fhandle, 4184 .bitmask = server->attr_bitmask, 4185 }; 4186 struct nfs4_statfs_res res = { 4187 .fsstat = fsstat, 4188 }; 4189 struct rpc_message msg = { 4190 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 4191 .rpc_argp = &args, 4192 .rpc_resp = &res, 4193 }; 4194 4195 nfs_fattr_init(fsstat->fattr); 4196 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4197 } 4198 4199 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 4200 { 4201 struct nfs4_exception exception = { }; 4202 int err; 4203 do { 4204 err = nfs4_handle_exception(server, 4205 _nfs4_proc_statfs(server, fhandle, fsstat), 4206 &exception); 4207 } while (exception.retry); 4208 return err; 4209 } 4210 4211 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 4212 struct nfs_fsinfo *fsinfo) 4213 { 4214 struct nfs4_fsinfo_arg args = { 4215 .fh = fhandle, 4216 .bitmask = server->attr_bitmask, 4217 }; 4218 struct nfs4_fsinfo_res res = { 4219 .fsinfo = fsinfo, 4220 }; 4221 struct rpc_message msg = { 4222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 4223 .rpc_argp = &args, 4224 .rpc_resp = &res, 4225 }; 4226 4227 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4228 } 4229 4230 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4231 { 4232 struct nfs4_exception exception = { }; 4233 unsigned long now = jiffies; 4234 int err; 4235 4236 do { 4237 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4238 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4239 if (err == 0) { 4240 nfs4_set_lease_period(server->nfs_client, 4241 fsinfo->lease_time * HZ, 4242 now); 4243 break; 4244 } 4245 err = nfs4_handle_exception(server, err, &exception); 4246 } while (exception.retry); 4247 return err; 4248 } 4249 4250 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4251 { 4252 int error; 4253 4254 nfs_fattr_init(fsinfo->fattr); 4255 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4256 if (error == 0) { 4257 /* block layout checks this! */ 4258 server->pnfs_blksize = fsinfo->blksize; 4259 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 4260 } 4261 4262 return error; 4263 } 4264 4265 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4266 struct nfs_pathconf *pathconf) 4267 { 4268 struct nfs4_pathconf_arg args = { 4269 .fh = fhandle, 4270 .bitmask = server->attr_bitmask, 4271 }; 4272 struct nfs4_pathconf_res res = { 4273 .pathconf = pathconf, 4274 }; 4275 struct rpc_message msg = { 4276 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4277 .rpc_argp = &args, 4278 .rpc_resp = &res, 4279 }; 4280 4281 /* None of the pathconf attributes are mandatory to implement */ 4282 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4283 memset(pathconf, 0, sizeof(*pathconf)); 4284 return 0; 4285 } 4286 4287 nfs_fattr_init(pathconf->fattr); 4288 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4289 } 4290 4291 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4292 struct nfs_pathconf *pathconf) 4293 { 4294 struct nfs4_exception exception = { }; 4295 int err; 4296 4297 do { 4298 err = nfs4_handle_exception(server, 4299 _nfs4_proc_pathconf(server, fhandle, pathconf), 4300 &exception); 4301 } while (exception.retry); 4302 return err; 4303 } 4304 4305 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4306 const struct nfs_open_context *ctx, 4307 const struct nfs_lock_context *l_ctx, 4308 fmode_t fmode) 4309 { 4310 const struct nfs_lockowner *lockowner = NULL; 4311 4312 if (l_ctx != NULL) 4313 lockowner = &l_ctx->lockowner; 4314 return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL); 4315 } 4316 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4317 4318 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4319 const struct nfs_open_context *ctx, 4320 const struct nfs_lock_context *l_ctx, 4321 fmode_t fmode) 4322 { 4323 nfs4_stateid current_stateid; 4324 4325 /* If the current stateid represents a lost lock, then exit */ 4326 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4327 return true; 4328 return nfs4_stateid_match(stateid, ¤t_stateid); 4329 } 4330 4331 static bool nfs4_error_stateid_expired(int err) 4332 { 4333 switch (err) { 4334 case -NFS4ERR_DELEG_REVOKED: 4335 case -NFS4ERR_ADMIN_REVOKED: 4336 case -NFS4ERR_BAD_STATEID: 4337 case -NFS4ERR_STALE_STATEID: 4338 case -NFS4ERR_OLD_STATEID: 4339 case -NFS4ERR_OPENMODE: 4340 case -NFS4ERR_EXPIRED: 4341 return true; 4342 } 4343 return false; 4344 } 4345 4346 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr) 4347 { 4348 nfs_invalidate_atime(hdr->inode); 4349 } 4350 4351 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4352 { 4353 struct nfs_server *server = NFS_SERVER(hdr->inode); 4354 4355 trace_nfs4_read(hdr, task->tk_status); 4356 if (nfs4_async_handle_error(task, server, 4357 hdr->args.context->state, 4358 NULL) == -EAGAIN) { 4359 rpc_restart_call_prepare(task); 4360 return -EAGAIN; 4361 } 4362 4363 __nfs4_read_done_cb(hdr); 4364 if (task->tk_status > 0) 4365 renew_lease(server, hdr->timestamp); 4366 return 0; 4367 } 4368 4369 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4370 struct nfs_pgio_args *args) 4371 { 4372 4373 if (!nfs4_error_stateid_expired(task->tk_status) || 4374 nfs4_stateid_is_current(&args->stateid, 4375 args->context, 4376 args->lock_context, 4377 FMODE_READ)) 4378 return false; 4379 rpc_restart_call_prepare(task); 4380 return true; 4381 } 4382 4383 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4384 { 4385 4386 dprintk("--> %s\n", __func__); 4387 4388 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4389 return -EAGAIN; 4390 if (nfs4_read_stateid_changed(task, &hdr->args)) 4391 return -EAGAIN; 4392 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4393 nfs4_read_done_cb(task, hdr); 4394 } 4395 4396 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4397 struct rpc_message *msg) 4398 { 4399 hdr->timestamp = jiffies; 4400 if (!hdr->pgio_done_cb) 4401 hdr->pgio_done_cb = nfs4_read_done_cb; 4402 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4403 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); 4404 } 4405 4406 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4407 struct nfs_pgio_header *hdr) 4408 { 4409 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode), 4410 &hdr->args.seq_args, 4411 &hdr->res.seq_res, 4412 task)) 4413 return 0; 4414 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4415 hdr->args.lock_context, 4416 hdr->rw_ops->rw_mode) == -EIO) 4417 return -EIO; 4418 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4419 return -EIO; 4420 return 0; 4421 } 4422 4423 static int nfs4_write_done_cb(struct rpc_task *task, 4424 struct nfs_pgio_header *hdr) 4425 { 4426 struct inode *inode = hdr->inode; 4427 4428 trace_nfs4_write(hdr, task->tk_status); 4429 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4430 hdr->args.context->state, 4431 NULL) == -EAGAIN) { 4432 rpc_restart_call_prepare(task); 4433 return -EAGAIN; 4434 } 4435 if (task->tk_status >= 0) { 4436 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4437 nfs_writeback_update_inode(hdr); 4438 } 4439 return 0; 4440 } 4441 4442 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4443 struct nfs_pgio_args *args) 4444 { 4445 4446 if (!nfs4_error_stateid_expired(task->tk_status) || 4447 nfs4_stateid_is_current(&args->stateid, 4448 args->context, 4449 args->lock_context, 4450 FMODE_WRITE)) 4451 return false; 4452 rpc_restart_call_prepare(task); 4453 return true; 4454 } 4455 4456 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4457 { 4458 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4459 return -EAGAIN; 4460 if (nfs4_write_stateid_changed(task, &hdr->args)) 4461 return -EAGAIN; 4462 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4463 nfs4_write_done_cb(task, hdr); 4464 } 4465 4466 static 4467 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4468 { 4469 /* Don't request attributes for pNFS or O_DIRECT writes */ 4470 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4471 return false; 4472 /* Otherwise, request attributes if and only if we don't hold 4473 * a delegation 4474 */ 4475 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4476 } 4477 4478 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4479 struct rpc_message *msg) 4480 { 4481 struct nfs_server *server = NFS_SERVER(hdr->inode); 4482 4483 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4484 hdr->args.bitmask = NULL; 4485 hdr->res.fattr = NULL; 4486 } else 4487 hdr->args.bitmask = server->cache_consistency_bitmask; 4488 4489 if (!hdr->pgio_done_cb) 4490 hdr->pgio_done_cb = nfs4_write_done_cb; 4491 hdr->res.server = server; 4492 hdr->timestamp = jiffies; 4493 4494 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4495 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1); 4496 } 4497 4498 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4499 { 4500 nfs4_setup_sequence(NFS_SERVER(data->inode), 4501 &data->args.seq_args, 4502 &data->res.seq_res, 4503 task); 4504 } 4505 4506 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4507 { 4508 struct inode *inode = data->inode; 4509 4510 trace_nfs4_commit(data, task->tk_status); 4511 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4512 NULL, NULL) == -EAGAIN) { 4513 rpc_restart_call_prepare(task); 4514 return -EAGAIN; 4515 } 4516 return 0; 4517 } 4518 4519 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4520 { 4521 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4522 return -EAGAIN; 4523 return data->commit_done_cb(task, data); 4524 } 4525 4526 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4527 { 4528 struct nfs_server *server = NFS_SERVER(data->inode); 4529 4530 if (data->commit_done_cb == NULL) 4531 data->commit_done_cb = nfs4_commit_done_cb; 4532 data->res.server = server; 4533 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4534 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4535 } 4536 4537 struct nfs4_renewdata { 4538 struct nfs_client *client; 4539 unsigned long timestamp; 4540 }; 4541 4542 /* 4543 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4544 * standalone procedure for queueing an asynchronous RENEW. 4545 */ 4546 static void nfs4_renew_release(void *calldata) 4547 { 4548 struct nfs4_renewdata *data = calldata; 4549 struct nfs_client *clp = data->client; 4550 4551 if (atomic_read(&clp->cl_count) > 1) 4552 nfs4_schedule_state_renewal(clp); 4553 nfs_put_client(clp); 4554 kfree(data); 4555 } 4556 4557 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4558 { 4559 struct nfs4_renewdata *data = calldata; 4560 struct nfs_client *clp = data->client; 4561 unsigned long timestamp = data->timestamp; 4562 4563 trace_nfs4_renew_async(clp, task->tk_status); 4564 switch (task->tk_status) { 4565 case 0: 4566 break; 4567 case -NFS4ERR_LEASE_MOVED: 4568 nfs4_schedule_lease_moved_recovery(clp); 4569 break; 4570 default: 4571 /* Unless we're shutting down, schedule state recovery! */ 4572 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 4573 return; 4574 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 4575 nfs4_schedule_lease_recovery(clp); 4576 return; 4577 } 4578 nfs4_schedule_path_down_recovery(clp); 4579 } 4580 do_renew_lease(clp, timestamp); 4581 } 4582 4583 static const struct rpc_call_ops nfs4_renew_ops = { 4584 .rpc_call_done = nfs4_renew_done, 4585 .rpc_release = nfs4_renew_release, 4586 }; 4587 4588 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 4589 { 4590 struct rpc_message msg = { 4591 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4592 .rpc_argp = clp, 4593 .rpc_cred = cred, 4594 }; 4595 struct nfs4_renewdata *data; 4596 4597 if (renew_flags == 0) 4598 return 0; 4599 if (!atomic_inc_not_zero(&clp->cl_count)) 4600 return -EIO; 4601 data = kmalloc(sizeof(*data), GFP_NOFS); 4602 if (data == NULL) 4603 return -ENOMEM; 4604 data->client = clp; 4605 data->timestamp = jiffies; 4606 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 4607 &nfs4_renew_ops, data); 4608 } 4609 4610 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 4611 { 4612 struct rpc_message msg = { 4613 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4614 .rpc_argp = clp, 4615 .rpc_cred = cred, 4616 }; 4617 unsigned long now = jiffies; 4618 int status; 4619 4620 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4621 if (status < 0) 4622 return status; 4623 do_renew_lease(clp, now); 4624 return 0; 4625 } 4626 4627 static inline int nfs4_server_supports_acls(struct nfs_server *server) 4628 { 4629 return server->caps & NFS_CAP_ACLS; 4630 } 4631 4632 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 4633 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 4634 * the stack. 4635 */ 4636 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 4637 4638 static int buf_to_pages_noslab(const void *buf, size_t buflen, 4639 struct page **pages) 4640 { 4641 struct page *newpage, **spages; 4642 int rc = 0; 4643 size_t len; 4644 spages = pages; 4645 4646 do { 4647 len = min_t(size_t, PAGE_SIZE, buflen); 4648 newpage = alloc_page(GFP_KERNEL); 4649 4650 if (newpage == NULL) 4651 goto unwind; 4652 memcpy(page_address(newpage), buf, len); 4653 buf += len; 4654 buflen -= len; 4655 *pages++ = newpage; 4656 rc++; 4657 } while (buflen != 0); 4658 4659 return rc; 4660 4661 unwind: 4662 for(; rc > 0; rc--) 4663 __free_page(spages[rc-1]); 4664 return -ENOMEM; 4665 } 4666 4667 struct nfs4_cached_acl { 4668 int cached; 4669 size_t len; 4670 char data[0]; 4671 }; 4672 4673 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 4674 { 4675 struct nfs_inode *nfsi = NFS_I(inode); 4676 4677 spin_lock(&inode->i_lock); 4678 kfree(nfsi->nfs4_acl); 4679 nfsi->nfs4_acl = acl; 4680 spin_unlock(&inode->i_lock); 4681 } 4682 4683 static void nfs4_zap_acl_attr(struct inode *inode) 4684 { 4685 nfs4_set_cached_acl(inode, NULL); 4686 } 4687 4688 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 4689 { 4690 struct nfs_inode *nfsi = NFS_I(inode); 4691 struct nfs4_cached_acl *acl; 4692 int ret = -ENOENT; 4693 4694 spin_lock(&inode->i_lock); 4695 acl = nfsi->nfs4_acl; 4696 if (acl == NULL) 4697 goto out; 4698 if (buf == NULL) /* user is just asking for length */ 4699 goto out_len; 4700 if (acl->cached == 0) 4701 goto out; 4702 ret = -ERANGE; /* see getxattr(2) man page */ 4703 if (acl->len > buflen) 4704 goto out; 4705 memcpy(buf, acl->data, acl->len); 4706 out_len: 4707 ret = acl->len; 4708 out: 4709 spin_unlock(&inode->i_lock); 4710 return ret; 4711 } 4712 4713 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 4714 { 4715 struct nfs4_cached_acl *acl; 4716 size_t buflen = sizeof(*acl) + acl_len; 4717 4718 if (buflen <= PAGE_SIZE) { 4719 acl = kmalloc(buflen, GFP_KERNEL); 4720 if (acl == NULL) 4721 goto out; 4722 acl->cached = 1; 4723 _copy_from_pages(acl->data, pages, pgbase, acl_len); 4724 } else { 4725 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 4726 if (acl == NULL) 4727 goto out; 4728 acl->cached = 0; 4729 } 4730 acl->len = acl_len; 4731 out: 4732 nfs4_set_cached_acl(inode, acl); 4733 } 4734 4735 /* 4736 * The getxattr API returns the required buffer length when called with a 4737 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 4738 * the required buf. On a NULL buf, we send a page of data to the server 4739 * guessing that the ACL request can be serviced by a page. If so, we cache 4740 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 4741 * the cache. If not so, we throw away the page, and cache the required 4742 * length. The next getxattr call will then produce another round trip to 4743 * the server, this time with the input buf of the required size. 4744 */ 4745 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4746 { 4747 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 4748 struct nfs_getaclargs args = { 4749 .fh = NFS_FH(inode), 4750 .acl_pages = pages, 4751 .acl_len = buflen, 4752 }; 4753 struct nfs_getaclres res = { 4754 .acl_len = buflen, 4755 }; 4756 struct rpc_message msg = { 4757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 4758 .rpc_argp = &args, 4759 .rpc_resp = &res, 4760 }; 4761 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4762 int ret = -ENOMEM, i; 4763 4764 /* As long as we're doing a round trip to the server anyway, 4765 * let's be prepared for a page of acl data. */ 4766 if (npages == 0) 4767 npages = 1; 4768 if (npages > ARRAY_SIZE(pages)) 4769 return -ERANGE; 4770 4771 for (i = 0; i < npages; i++) { 4772 pages[i] = alloc_page(GFP_KERNEL); 4773 if (!pages[i]) 4774 goto out_free; 4775 } 4776 4777 /* for decoding across pages */ 4778 res.acl_scratch = alloc_page(GFP_KERNEL); 4779 if (!res.acl_scratch) 4780 goto out_free; 4781 4782 args.acl_len = npages * PAGE_SIZE; 4783 4784 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 4785 __func__, buf, buflen, npages, args.acl_len); 4786 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 4787 &msg, &args.seq_args, &res.seq_res, 0); 4788 if (ret) 4789 goto out_free; 4790 4791 /* Handle the case where the passed-in buffer is too short */ 4792 if (res.acl_flags & NFS4_ACL_TRUNC) { 4793 /* Did the user only issue a request for the acl length? */ 4794 if (buf == NULL) 4795 goto out_ok; 4796 ret = -ERANGE; 4797 goto out_free; 4798 } 4799 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 4800 if (buf) { 4801 if (res.acl_len > buflen) { 4802 ret = -ERANGE; 4803 goto out_free; 4804 } 4805 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 4806 } 4807 out_ok: 4808 ret = res.acl_len; 4809 out_free: 4810 for (i = 0; i < npages; i++) 4811 if (pages[i]) 4812 __free_page(pages[i]); 4813 if (res.acl_scratch) 4814 __free_page(res.acl_scratch); 4815 return ret; 4816 } 4817 4818 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4819 { 4820 struct nfs4_exception exception = { }; 4821 ssize_t ret; 4822 do { 4823 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 4824 trace_nfs4_get_acl(inode, ret); 4825 if (ret >= 0) 4826 break; 4827 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 4828 } while (exception.retry); 4829 return ret; 4830 } 4831 4832 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 4833 { 4834 struct nfs_server *server = NFS_SERVER(inode); 4835 int ret; 4836 4837 if (!nfs4_server_supports_acls(server)) 4838 return -EOPNOTSUPP; 4839 ret = nfs_revalidate_inode(server, inode); 4840 if (ret < 0) 4841 return ret; 4842 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 4843 nfs_zap_acl_cache(inode); 4844 ret = nfs4_read_cached_acl(inode, buf, buflen); 4845 if (ret != -ENOENT) 4846 /* -ENOENT is returned if there is no ACL or if there is an ACL 4847 * but no cached acl data, just the acl length */ 4848 return ret; 4849 return nfs4_get_acl_uncached(inode, buf, buflen); 4850 } 4851 4852 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4853 { 4854 struct nfs_server *server = NFS_SERVER(inode); 4855 struct page *pages[NFS4ACL_MAXPAGES]; 4856 struct nfs_setaclargs arg = { 4857 .fh = NFS_FH(inode), 4858 .acl_pages = pages, 4859 .acl_len = buflen, 4860 }; 4861 struct nfs_setaclres res; 4862 struct rpc_message msg = { 4863 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 4864 .rpc_argp = &arg, 4865 .rpc_resp = &res, 4866 }; 4867 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4868 int ret, i; 4869 4870 if (!nfs4_server_supports_acls(server)) 4871 return -EOPNOTSUPP; 4872 if (npages > ARRAY_SIZE(pages)) 4873 return -ERANGE; 4874 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages); 4875 if (i < 0) 4876 return i; 4877 nfs4_inode_return_delegation(inode); 4878 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4879 4880 /* 4881 * Free each page after tx, so the only ref left is 4882 * held by the network stack 4883 */ 4884 for (; i > 0; i--) 4885 put_page(pages[i-1]); 4886 4887 /* 4888 * Acl update can result in inode attribute update. 4889 * so mark the attribute cache invalid. 4890 */ 4891 spin_lock(&inode->i_lock); 4892 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 4893 spin_unlock(&inode->i_lock); 4894 nfs_access_zap_cache(inode); 4895 nfs_zap_acl_cache(inode); 4896 return ret; 4897 } 4898 4899 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4900 { 4901 struct nfs4_exception exception = { }; 4902 int err; 4903 do { 4904 err = __nfs4_proc_set_acl(inode, buf, buflen); 4905 trace_nfs4_set_acl(inode, err); 4906 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4907 &exception); 4908 } while (exception.retry); 4909 return err; 4910 } 4911 4912 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 4913 static int _nfs4_get_security_label(struct inode *inode, void *buf, 4914 size_t buflen) 4915 { 4916 struct nfs_server *server = NFS_SERVER(inode); 4917 struct nfs_fattr fattr; 4918 struct nfs4_label label = {0, 0, buflen, buf}; 4919 4920 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4921 struct nfs4_getattr_arg arg = { 4922 .fh = NFS_FH(inode), 4923 .bitmask = bitmask, 4924 }; 4925 struct nfs4_getattr_res res = { 4926 .fattr = &fattr, 4927 .label = &label, 4928 .server = server, 4929 }; 4930 struct rpc_message msg = { 4931 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4932 .rpc_argp = &arg, 4933 .rpc_resp = &res, 4934 }; 4935 int ret; 4936 4937 nfs_fattr_init(&fattr); 4938 4939 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 4940 if (ret) 4941 return ret; 4942 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 4943 return -ENOENT; 4944 if (buflen < label.len) 4945 return -ERANGE; 4946 return 0; 4947 } 4948 4949 static int nfs4_get_security_label(struct inode *inode, void *buf, 4950 size_t buflen) 4951 { 4952 struct nfs4_exception exception = { }; 4953 int err; 4954 4955 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4956 return -EOPNOTSUPP; 4957 4958 do { 4959 err = _nfs4_get_security_label(inode, buf, buflen); 4960 trace_nfs4_get_security_label(inode, err); 4961 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4962 &exception); 4963 } while (exception.retry); 4964 return err; 4965 } 4966 4967 static int _nfs4_do_set_security_label(struct inode *inode, 4968 struct nfs4_label *ilabel, 4969 struct nfs_fattr *fattr, 4970 struct nfs4_label *olabel) 4971 { 4972 4973 struct iattr sattr = {0}; 4974 struct nfs_server *server = NFS_SERVER(inode); 4975 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4976 struct nfs_setattrargs arg = { 4977 .fh = NFS_FH(inode), 4978 .iap = &sattr, 4979 .server = server, 4980 .bitmask = bitmask, 4981 .label = ilabel, 4982 }; 4983 struct nfs_setattrres res = { 4984 .fattr = fattr, 4985 .label = olabel, 4986 .server = server, 4987 }; 4988 struct rpc_message msg = { 4989 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 4990 .rpc_argp = &arg, 4991 .rpc_resp = &res, 4992 }; 4993 int status; 4994 4995 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 4996 4997 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4998 if (status) 4999 dprintk("%s failed: %d\n", __func__, status); 5000 5001 return status; 5002 } 5003 5004 static int nfs4_do_set_security_label(struct inode *inode, 5005 struct nfs4_label *ilabel, 5006 struct nfs_fattr *fattr, 5007 struct nfs4_label *olabel) 5008 { 5009 struct nfs4_exception exception = { }; 5010 int err; 5011 5012 do { 5013 err = _nfs4_do_set_security_label(inode, ilabel, 5014 fattr, olabel); 5015 trace_nfs4_set_security_label(inode, err); 5016 err = nfs4_handle_exception(NFS_SERVER(inode), err, 5017 &exception); 5018 } while (exception.retry); 5019 return err; 5020 } 5021 5022 static int 5023 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 5024 { 5025 struct nfs4_label ilabel, *olabel = NULL; 5026 struct nfs_fattr fattr; 5027 struct rpc_cred *cred; 5028 int status; 5029 5030 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 5031 return -EOPNOTSUPP; 5032 5033 nfs_fattr_init(&fattr); 5034 5035 ilabel.pi = 0; 5036 ilabel.lfs = 0; 5037 ilabel.label = (char *)buf; 5038 ilabel.len = buflen; 5039 5040 cred = rpc_lookup_cred(); 5041 if (IS_ERR(cred)) 5042 return PTR_ERR(cred); 5043 5044 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5045 if (IS_ERR(olabel)) { 5046 status = -PTR_ERR(olabel); 5047 goto out; 5048 } 5049 5050 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5051 if (status == 0) 5052 nfs_setsecurity(inode, &fattr, olabel); 5053 5054 nfs4_label_free(olabel); 5055 out: 5056 put_rpccred(cred); 5057 return status; 5058 } 5059 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5060 5061 5062 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5063 nfs4_verifier *bootverf) 5064 { 5065 __be32 verf[2]; 5066 5067 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5068 /* An impossible timestamp guarantees this value 5069 * will never match a generated boot time. */ 5070 verf[0] = 0; 5071 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1); 5072 } else { 5073 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5074 verf[0] = cpu_to_be32(nn->boot_time.tv_sec); 5075 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec); 5076 } 5077 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 5078 } 5079 5080 static int 5081 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 5082 { 5083 size_t len; 5084 char *str; 5085 5086 if (clp->cl_owner_id != NULL) 5087 return 0; 5088 5089 rcu_read_lock(); 5090 len = 14 + strlen(clp->cl_ipaddr) + 1 + 5091 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 5092 1 + 5093 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) + 5094 1; 5095 rcu_read_unlock(); 5096 5097 if (len > NFS4_OPAQUE_LIMIT + 1) 5098 return -EINVAL; 5099 5100 /* 5101 * Since this string is allocated at mount time, and held until the 5102 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5103 * about a memory-reclaim deadlock. 5104 */ 5105 str = kmalloc(len, GFP_KERNEL); 5106 if (!str) 5107 return -ENOMEM; 5108 5109 rcu_read_lock(); 5110 scnprintf(str, len, "Linux NFSv4.0 %s/%s %s", 5111 clp->cl_ipaddr, 5112 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), 5113 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)); 5114 rcu_read_unlock(); 5115 5116 clp->cl_owner_id = str; 5117 return 0; 5118 } 5119 5120 static int 5121 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 5122 { 5123 size_t len; 5124 char *str; 5125 5126 len = 10 + 10 + 1 + 10 + 1 + 5127 strlen(nfs4_client_id_uniquifier) + 1 + 5128 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5129 5130 if (len > NFS4_OPAQUE_LIMIT + 1) 5131 return -EINVAL; 5132 5133 /* 5134 * Since this string is allocated at mount time, and held until the 5135 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5136 * about a memory-reclaim deadlock. 5137 */ 5138 str = kmalloc(len, GFP_KERNEL); 5139 if (!str) 5140 return -ENOMEM; 5141 5142 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 5143 clp->rpc_ops->version, clp->cl_minorversion, 5144 nfs4_client_id_uniquifier, 5145 clp->cl_rpcclient->cl_nodename); 5146 clp->cl_owner_id = str; 5147 return 0; 5148 } 5149 5150 static int 5151 nfs4_init_uniform_client_string(struct nfs_client *clp) 5152 { 5153 size_t len; 5154 char *str; 5155 5156 if (clp->cl_owner_id != NULL) 5157 return 0; 5158 5159 if (nfs4_client_id_uniquifier[0] != '\0') 5160 return nfs4_init_uniquifier_client_string(clp); 5161 5162 len = 10 + 10 + 1 + 10 + 1 + 5163 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5164 5165 if (len > NFS4_OPAQUE_LIMIT + 1) 5166 return -EINVAL; 5167 5168 /* 5169 * Since this string is allocated at mount time, and held until the 5170 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5171 * about a memory-reclaim deadlock. 5172 */ 5173 str = kmalloc(len, GFP_KERNEL); 5174 if (!str) 5175 return -ENOMEM; 5176 5177 scnprintf(str, len, "Linux NFSv%u.%u %s", 5178 clp->rpc_ops->version, clp->cl_minorversion, 5179 clp->cl_rpcclient->cl_nodename); 5180 clp->cl_owner_id = str; 5181 return 0; 5182 } 5183 5184 /* 5185 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 5186 * services. Advertise one based on the address family of the 5187 * clientaddr. 5188 */ 5189 static unsigned int 5190 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 5191 { 5192 if (strchr(clp->cl_ipaddr, ':') != NULL) 5193 return scnprintf(buf, len, "tcp6"); 5194 else 5195 return scnprintf(buf, len, "tcp"); 5196 } 5197 5198 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 5199 { 5200 struct nfs4_setclientid *sc = calldata; 5201 5202 if (task->tk_status == 0) 5203 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 5204 } 5205 5206 static const struct rpc_call_ops nfs4_setclientid_ops = { 5207 .rpc_call_done = nfs4_setclientid_done, 5208 }; 5209 5210 /** 5211 * nfs4_proc_setclientid - Negotiate client ID 5212 * @clp: state data structure 5213 * @program: RPC program for NFSv4 callback service 5214 * @port: IP port number for NFS4 callback service 5215 * @cred: RPC credential to use for this call 5216 * @res: where to place the result 5217 * 5218 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5219 */ 5220 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 5221 unsigned short port, struct rpc_cred *cred, 5222 struct nfs4_setclientid_res *res) 5223 { 5224 nfs4_verifier sc_verifier; 5225 struct nfs4_setclientid setclientid = { 5226 .sc_verifier = &sc_verifier, 5227 .sc_prog = program, 5228 .sc_clnt = clp, 5229 }; 5230 struct rpc_message msg = { 5231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5232 .rpc_argp = &setclientid, 5233 .rpc_resp = res, 5234 .rpc_cred = cred, 5235 }; 5236 struct rpc_task *task; 5237 struct rpc_task_setup task_setup_data = { 5238 .rpc_client = clp->cl_rpcclient, 5239 .rpc_message = &msg, 5240 .callback_ops = &nfs4_setclientid_ops, 5241 .callback_data = &setclientid, 5242 .flags = RPC_TASK_TIMEOUT, 5243 }; 5244 int status; 5245 5246 /* nfs_client_id4 */ 5247 nfs4_init_boot_verifier(clp, &sc_verifier); 5248 5249 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5250 status = nfs4_init_uniform_client_string(clp); 5251 else 5252 status = nfs4_init_nonuniform_client_string(clp); 5253 5254 if (status) 5255 goto out; 5256 5257 /* cb_client4 */ 5258 setclientid.sc_netid_len = 5259 nfs4_init_callback_netid(clp, 5260 setclientid.sc_netid, 5261 sizeof(setclientid.sc_netid)); 5262 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5263 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5264 clp->cl_ipaddr, port >> 8, port & 255); 5265 5266 dprintk("NFS call setclientid auth=%s, '%s'\n", 5267 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5268 clp->cl_owner_id); 5269 task = rpc_run_task(&task_setup_data); 5270 if (IS_ERR(task)) { 5271 status = PTR_ERR(task); 5272 goto out; 5273 } 5274 status = task->tk_status; 5275 if (setclientid.sc_cred) { 5276 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5277 put_rpccred(setclientid.sc_cred); 5278 } 5279 rpc_put_task(task); 5280 out: 5281 trace_nfs4_setclientid(clp, status); 5282 dprintk("NFS reply setclientid: %d\n", status); 5283 return status; 5284 } 5285 5286 /** 5287 * nfs4_proc_setclientid_confirm - Confirm client ID 5288 * @clp: state data structure 5289 * @res: result of a previous SETCLIENTID 5290 * @cred: RPC credential to use for this call 5291 * 5292 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5293 */ 5294 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5295 struct nfs4_setclientid_res *arg, 5296 struct rpc_cred *cred) 5297 { 5298 struct rpc_message msg = { 5299 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5300 .rpc_argp = arg, 5301 .rpc_cred = cred, 5302 }; 5303 int status; 5304 5305 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5306 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5307 clp->cl_clientid); 5308 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5309 trace_nfs4_setclientid_confirm(clp, status); 5310 dprintk("NFS reply setclientid_confirm: %d\n", status); 5311 return status; 5312 } 5313 5314 struct nfs4_delegreturndata { 5315 struct nfs4_delegreturnargs args; 5316 struct nfs4_delegreturnres res; 5317 struct nfs_fh fh; 5318 nfs4_stateid stateid; 5319 unsigned long timestamp; 5320 struct nfs_fattr fattr; 5321 int rpc_status; 5322 struct inode *inode; 5323 bool roc; 5324 u32 roc_barrier; 5325 }; 5326 5327 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5328 { 5329 struct nfs4_delegreturndata *data = calldata; 5330 5331 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5332 return; 5333 5334 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5335 switch (task->tk_status) { 5336 case 0: 5337 renew_lease(data->res.server, data->timestamp); 5338 case -NFS4ERR_ADMIN_REVOKED: 5339 case -NFS4ERR_DELEG_REVOKED: 5340 case -NFS4ERR_BAD_STATEID: 5341 case -NFS4ERR_OLD_STATEID: 5342 case -NFS4ERR_STALE_STATEID: 5343 case -NFS4ERR_EXPIRED: 5344 task->tk_status = 0; 5345 if (data->roc) 5346 pnfs_roc_set_barrier(data->inode, data->roc_barrier); 5347 break; 5348 default: 5349 if (nfs4_async_handle_error(task, data->res.server, 5350 NULL, NULL) == -EAGAIN) { 5351 rpc_restart_call_prepare(task); 5352 return; 5353 } 5354 } 5355 data->rpc_status = task->tk_status; 5356 } 5357 5358 static void nfs4_delegreturn_release(void *calldata) 5359 { 5360 struct nfs4_delegreturndata *data = calldata; 5361 struct inode *inode = data->inode; 5362 5363 if (inode) { 5364 if (data->roc) 5365 pnfs_roc_release(inode); 5366 nfs_iput_and_deactive(inode); 5367 } 5368 kfree(calldata); 5369 } 5370 5371 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5372 { 5373 struct nfs4_delegreturndata *d_data; 5374 5375 d_data = (struct nfs4_delegreturndata *)data; 5376 5377 if (nfs4_wait_on_layoutreturn(d_data->inode, task)) 5378 return; 5379 5380 if (d_data->roc) 5381 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier); 5382 5383 nfs4_setup_sequence(d_data->res.server, 5384 &d_data->args.seq_args, 5385 &d_data->res.seq_res, 5386 task); 5387 } 5388 5389 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5390 .rpc_call_prepare = nfs4_delegreturn_prepare, 5391 .rpc_call_done = nfs4_delegreturn_done, 5392 .rpc_release = nfs4_delegreturn_release, 5393 }; 5394 5395 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5396 { 5397 struct nfs4_delegreturndata *data; 5398 struct nfs_server *server = NFS_SERVER(inode); 5399 struct rpc_task *task; 5400 struct rpc_message msg = { 5401 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5402 .rpc_cred = cred, 5403 }; 5404 struct rpc_task_setup task_setup_data = { 5405 .rpc_client = server->client, 5406 .rpc_message = &msg, 5407 .callback_ops = &nfs4_delegreturn_ops, 5408 .flags = RPC_TASK_ASYNC, 5409 }; 5410 int status = 0; 5411 5412 data = kzalloc(sizeof(*data), GFP_NOFS); 5413 if (data == NULL) 5414 return -ENOMEM; 5415 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5416 5417 nfs4_state_protect(server->nfs_client, 5418 NFS_SP4_MACH_CRED_CLEANUP, 5419 &task_setup_data.rpc_client, &msg); 5420 5421 data->args.fhandle = &data->fh; 5422 data->args.stateid = &data->stateid; 5423 data->args.bitmask = server->cache_consistency_bitmask; 5424 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5425 nfs4_stateid_copy(&data->stateid, stateid); 5426 data->res.fattr = &data->fattr; 5427 data->res.server = server; 5428 nfs_fattr_init(data->res.fattr); 5429 data->timestamp = jiffies; 5430 data->rpc_status = 0; 5431 data->inode = nfs_igrab_and_active(inode); 5432 if (data->inode) 5433 data->roc = nfs4_roc(inode); 5434 5435 task_setup_data.callback_data = data; 5436 msg.rpc_argp = &data->args; 5437 msg.rpc_resp = &data->res; 5438 task = rpc_run_task(&task_setup_data); 5439 if (IS_ERR(task)) 5440 return PTR_ERR(task); 5441 if (!issync) 5442 goto out; 5443 status = nfs4_wait_for_completion_rpc_task(task); 5444 if (status != 0) 5445 goto out; 5446 status = data->rpc_status; 5447 if (status == 0) 5448 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5449 else 5450 nfs_refresh_inode(inode, &data->fattr); 5451 out: 5452 rpc_put_task(task); 5453 return status; 5454 } 5455 5456 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5457 { 5458 struct nfs_server *server = NFS_SERVER(inode); 5459 struct nfs4_exception exception = { }; 5460 int err; 5461 do { 5462 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5463 trace_nfs4_delegreturn(inode, stateid, err); 5464 switch (err) { 5465 case -NFS4ERR_STALE_STATEID: 5466 case -NFS4ERR_EXPIRED: 5467 case 0: 5468 return 0; 5469 } 5470 err = nfs4_handle_exception(server, err, &exception); 5471 } while (exception.retry); 5472 return err; 5473 } 5474 5475 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 5476 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 5477 5478 /* 5479 * sleep, with exponential backoff, and retry the LOCK operation. 5480 */ 5481 static unsigned long 5482 nfs4_set_lock_task_retry(unsigned long timeout) 5483 { 5484 freezable_schedule_timeout_killable_unsafe(timeout); 5485 timeout <<= 1; 5486 if (timeout > NFS4_LOCK_MAXTIMEOUT) 5487 return NFS4_LOCK_MAXTIMEOUT; 5488 return timeout; 5489 } 5490 5491 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5492 { 5493 struct inode *inode = state->inode; 5494 struct nfs_server *server = NFS_SERVER(inode); 5495 struct nfs_client *clp = server->nfs_client; 5496 struct nfs_lockt_args arg = { 5497 .fh = NFS_FH(inode), 5498 .fl = request, 5499 }; 5500 struct nfs_lockt_res res = { 5501 .denied = request, 5502 }; 5503 struct rpc_message msg = { 5504 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5505 .rpc_argp = &arg, 5506 .rpc_resp = &res, 5507 .rpc_cred = state->owner->so_cred, 5508 }; 5509 struct nfs4_lock_state *lsp; 5510 int status; 5511 5512 arg.lock_owner.clientid = clp->cl_clientid; 5513 status = nfs4_set_lock_state(state, request); 5514 if (status != 0) 5515 goto out; 5516 lsp = request->fl_u.nfs4_fl.owner; 5517 arg.lock_owner.id = lsp->ls_seqid.owner_id; 5518 arg.lock_owner.s_dev = server->s_dev; 5519 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5520 switch (status) { 5521 case 0: 5522 request->fl_type = F_UNLCK; 5523 break; 5524 case -NFS4ERR_DENIED: 5525 status = 0; 5526 } 5527 request->fl_ops->fl_release_private(request); 5528 request->fl_ops = NULL; 5529 out: 5530 return status; 5531 } 5532 5533 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5534 { 5535 struct nfs4_exception exception = { }; 5536 int err; 5537 5538 do { 5539 err = _nfs4_proc_getlk(state, cmd, request); 5540 trace_nfs4_get_lock(request, state, cmd, err); 5541 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 5542 &exception); 5543 } while (exception.retry); 5544 return err; 5545 } 5546 5547 static int do_vfs_lock(struct inode *inode, struct file_lock *fl) 5548 { 5549 return locks_lock_inode_wait(inode, fl); 5550 } 5551 5552 struct nfs4_unlockdata { 5553 struct nfs_locku_args arg; 5554 struct nfs_locku_res res; 5555 struct nfs4_lock_state *lsp; 5556 struct nfs_open_context *ctx; 5557 struct file_lock fl; 5558 struct nfs_server *server; 5559 unsigned long timestamp; 5560 }; 5561 5562 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 5563 struct nfs_open_context *ctx, 5564 struct nfs4_lock_state *lsp, 5565 struct nfs_seqid *seqid) 5566 { 5567 struct nfs4_unlockdata *p; 5568 struct inode *inode = lsp->ls_state->inode; 5569 5570 p = kzalloc(sizeof(*p), GFP_NOFS); 5571 if (p == NULL) 5572 return NULL; 5573 p->arg.fh = NFS_FH(inode); 5574 p->arg.fl = &p->fl; 5575 p->arg.seqid = seqid; 5576 p->res.seqid = seqid; 5577 p->lsp = lsp; 5578 atomic_inc(&lsp->ls_count); 5579 /* Ensure we don't close file until we're done freeing locks! */ 5580 p->ctx = get_nfs_open_context(ctx); 5581 memcpy(&p->fl, fl, sizeof(p->fl)); 5582 p->server = NFS_SERVER(inode); 5583 return p; 5584 } 5585 5586 static void nfs4_locku_release_calldata(void *data) 5587 { 5588 struct nfs4_unlockdata *calldata = data; 5589 nfs_free_seqid(calldata->arg.seqid); 5590 nfs4_put_lock_state(calldata->lsp); 5591 put_nfs_open_context(calldata->ctx); 5592 kfree(calldata); 5593 } 5594 5595 static void nfs4_locku_done(struct rpc_task *task, void *data) 5596 { 5597 struct nfs4_unlockdata *calldata = data; 5598 5599 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 5600 return; 5601 switch (task->tk_status) { 5602 case 0: 5603 renew_lease(calldata->server, calldata->timestamp); 5604 do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl); 5605 if (nfs4_update_lock_stateid(calldata->lsp, 5606 &calldata->res.stateid)) 5607 break; 5608 case -NFS4ERR_BAD_STATEID: 5609 case -NFS4ERR_OLD_STATEID: 5610 case -NFS4ERR_STALE_STATEID: 5611 case -NFS4ERR_EXPIRED: 5612 if (!nfs4_stateid_match(&calldata->arg.stateid, 5613 &calldata->lsp->ls_stateid)) 5614 rpc_restart_call_prepare(task); 5615 break; 5616 default: 5617 if (nfs4_async_handle_error(task, calldata->server, 5618 NULL, NULL) == -EAGAIN) 5619 rpc_restart_call_prepare(task); 5620 } 5621 nfs_release_seqid(calldata->arg.seqid); 5622 } 5623 5624 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 5625 { 5626 struct nfs4_unlockdata *calldata = data; 5627 5628 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 5629 goto out_wait; 5630 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid); 5631 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 5632 /* Note: exit _without_ running nfs4_locku_done */ 5633 goto out_no_action; 5634 } 5635 calldata->timestamp = jiffies; 5636 if (nfs4_setup_sequence(calldata->server, 5637 &calldata->arg.seq_args, 5638 &calldata->res.seq_res, 5639 task) != 0) 5640 nfs_release_seqid(calldata->arg.seqid); 5641 return; 5642 out_no_action: 5643 task->tk_action = NULL; 5644 out_wait: 5645 nfs4_sequence_done(task, &calldata->res.seq_res); 5646 } 5647 5648 static const struct rpc_call_ops nfs4_locku_ops = { 5649 .rpc_call_prepare = nfs4_locku_prepare, 5650 .rpc_call_done = nfs4_locku_done, 5651 .rpc_release = nfs4_locku_release_calldata, 5652 }; 5653 5654 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 5655 struct nfs_open_context *ctx, 5656 struct nfs4_lock_state *lsp, 5657 struct nfs_seqid *seqid) 5658 { 5659 struct nfs4_unlockdata *data; 5660 struct rpc_message msg = { 5661 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 5662 .rpc_cred = ctx->cred, 5663 }; 5664 struct rpc_task_setup task_setup_data = { 5665 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 5666 .rpc_message = &msg, 5667 .callback_ops = &nfs4_locku_ops, 5668 .workqueue = nfsiod_workqueue, 5669 .flags = RPC_TASK_ASYNC, 5670 }; 5671 5672 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 5673 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 5674 5675 /* Ensure this is an unlock - when canceling a lock, the 5676 * canceled lock is passed in, and it won't be an unlock. 5677 */ 5678 fl->fl_type = F_UNLCK; 5679 5680 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 5681 if (data == NULL) { 5682 nfs_free_seqid(seqid); 5683 return ERR_PTR(-ENOMEM); 5684 } 5685 5686 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5687 msg.rpc_argp = &data->arg; 5688 msg.rpc_resp = &data->res; 5689 task_setup_data.callback_data = data; 5690 return rpc_run_task(&task_setup_data); 5691 } 5692 5693 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 5694 { 5695 struct inode *inode = state->inode; 5696 struct nfs4_state_owner *sp = state->owner; 5697 struct nfs_inode *nfsi = NFS_I(inode); 5698 struct nfs_seqid *seqid; 5699 struct nfs4_lock_state *lsp; 5700 struct rpc_task *task; 5701 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 5702 int status = 0; 5703 unsigned char fl_flags = request->fl_flags; 5704 5705 status = nfs4_set_lock_state(state, request); 5706 /* Unlock _before_ we do the RPC call */ 5707 request->fl_flags |= FL_EXISTS; 5708 /* Exclude nfs_delegation_claim_locks() */ 5709 mutex_lock(&sp->so_delegreturn_mutex); 5710 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 5711 down_read(&nfsi->rwsem); 5712 if (do_vfs_lock(inode, request) == -ENOENT) { 5713 up_read(&nfsi->rwsem); 5714 mutex_unlock(&sp->so_delegreturn_mutex); 5715 goto out; 5716 } 5717 up_read(&nfsi->rwsem); 5718 mutex_unlock(&sp->so_delegreturn_mutex); 5719 if (status != 0) 5720 goto out; 5721 /* Is this a delegated lock? */ 5722 lsp = request->fl_u.nfs4_fl.owner; 5723 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 5724 goto out; 5725 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 5726 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 5727 status = -ENOMEM; 5728 if (IS_ERR(seqid)) 5729 goto out; 5730 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 5731 status = PTR_ERR(task); 5732 if (IS_ERR(task)) 5733 goto out; 5734 status = nfs4_wait_for_completion_rpc_task(task); 5735 rpc_put_task(task); 5736 out: 5737 request->fl_flags = fl_flags; 5738 trace_nfs4_unlock(request, state, F_SETLK, status); 5739 return status; 5740 } 5741 5742 struct nfs4_lockdata { 5743 struct nfs_lock_args arg; 5744 struct nfs_lock_res res; 5745 struct nfs4_lock_state *lsp; 5746 struct nfs_open_context *ctx; 5747 struct file_lock fl; 5748 unsigned long timestamp; 5749 int rpc_status; 5750 int cancelled; 5751 struct nfs_server *server; 5752 }; 5753 5754 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 5755 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 5756 gfp_t gfp_mask) 5757 { 5758 struct nfs4_lockdata *p; 5759 struct inode *inode = lsp->ls_state->inode; 5760 struct nfs_server *server = NFS_SERVER(inode); 5761 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 5762 5763 p = kzalloc(sizeof(*p), gfp_mask); 5764 if (p == NULL) 5765 return NULL; 5766 5767 p->arg.fh = NFS_FH(inode); 5768 p->arg.fl = &p->fl; 5769 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 5770 if (IS_ERR(p->arg.open_seqid)) 5771 goto out_free; 5772 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 5773 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 5774 if (IS_ERR(p->arg.lock_seqid)) 5775 goto out_free_seqid; 5776 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 5777 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 5778 p->arg.lock_owner.s_dev = server->s_dev; 5779 p->res.lock_seqid = p->arg.lock_seqid; 5780 p->lsp = lsp; 5781 p->server = server; 5782 atomic_inc(&lsp->ls_count); 5783 p->ctx = get_nfs_open_context(ctx); 5784 get_file(fl->fl_file); 5785 memcpy(&p->fl, fl, sizeof(p->fl)); 5786 return p; 5787 out_free_seqid: 5788 nfs_free_seqid(p->arg.open_seqid); 5789 out_free: 5790 kfree(p); 5791 return NULL; 5792 } 5793 5794 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 5795 { 5796 struct nfs4_lockdata *data = calldata; 5797 struct nfs4_state *state = data->lsp->ls_state; 5798 5799 dprintk("%s: begin!\n", __func__); 5800 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 5801 goto out_wait; 5802 /* Do we need to do an open_to_lock_owner? */ 5803 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 5804 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 5805 goto out_release_lock_seqid; 5806 } 5807 nfs4_stateid_copy(&data->arg.open_stateid, 5808 &state->open_stateid); 5809 data->arg.new_lock_owner = 1; 5810 data->res.open_seqid = data->arg.open_seqid; 5811 } else { 5812 data->arg.new_lock_owner = 0; 5813 nfs4_stateid_copy(&data->arg.lock_stateid, 5814 &data->lsp->ls_stateid); 5815 } 5816 if (!nfs4_valid_open_stateid(state)) { 5817 data->rpc_status = -EBADF; 5818 task->tk_action = NULL; 5819 goto out_release_open_seqid; 5820 } 5821 data->timestamp = jiffies; 5822 if (nfs4_setup_sequence(data->server, 5823 &data->arg.seq_args, 5824 &data->res.seq_res, 5825 task) == 0) 5826 return; 5827 out_release_open_seqid: 5828 nfs_release_seqid(data->arg.open_seqid); 5829 out_release_lock_seqid: 5830 nfs_release_seqid(data->arg.lock_seqid); 5831 out_wait: 5832 nfs4_sequence_done(task, &data->res.seq_res); 5833 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 5834 } 5835 5836 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 5837 { 5838 struct nfs4_lockdata *data = calldata; 5839 struct nfs4_lock_state *lsp = data->lsp; 5840 5841 dprintk("%s: begin!\n", __func__); 5842 5843 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5844 return; 5845 5846 data->rpc_status = task->tk_status; 5847 switch (task->tk_status) { 5848 case 0: 5849 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 5850 data->timestamp); 5851 if (data->arg.new_lock) { 5852 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 5853 if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) { 5854 rpc_restart_call_prepare(task); 5855 break; 5856 } 5857 } 5858 if (data->arg.new_lock_owner != 0) { 5859 nfs_confirm_seqid(&lsp->ls_seqid, 0); 5860 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 5861 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 5862 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 5863 rpc_restart_call_prepare(task); 5864 break; 5865 case -NFS4ERR_BAD_STATEID: 5866 case -NFS4ERR_OLD_STATEID: 5867 case -NFS4ERR_STALE_STATEID: 5868 case -NFS4ERR_EXPIRED: 5869 if (data->arg.new_lock_owner != 0) { 5870 if (!nfs4_stateid_match(&data->arg.open_stateid, 5871 &lsp->ls_state->open_stateid)) 5872 rpc_restart_call_prepare(task); 5873 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 5874 &lsp->ls_stateid)) 5875 rpc_restart_call_prepare(task); 5876 } 5877 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 5878 } 5879 5880 static void nfs4_lock_release(void *calldata) 5881 { 5882 struct nfs4_lockdata *data = calldata; 5883 5884 dprintk("%s: begin!\n", __func__); 5885 nfs_free_seqid(data->arg.open_seqid); 5886 if (data->cancelled != 0) { 5887 struct rpc_task *task; 5888 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 5889 data->arg.lock_seqid); 5890 if (!IS_ERR(task)) 5891 rpc_put_task_async(task); 5892 dprintk("%s: cancelling lock!\n", __func__); 5893 } else 5894 nfs_free_seqid(data->arg.lock_seqid); 5895 nfs4_put_lock_state(data->lsp); 5896 put_nfs_open_context(data->ctx); 5897 fput(data->fl.fl_file); 5898 kfree(data); 5899 dprintk("%s: done!\n", __func__); 5900 } 5901 5902 static const struct rpc_call_ops nfs4_lock_ops = { 5903 .rpc_call_prepare = nfs4_lock_prepare, 5904 .rpc_call_done = nfs4_lock_done, 5905 .rpc_release = nfs4_lock_release, 5906 }; 5907 5908 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 5909 { 5910 switch (error) { 5911 case -NFS4ERR_ADMIN_REVOKED: 5912 case -NFS4ERR_BAD_STATEID: 5913 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5914 if (new_lock_owner != 0 || 5915 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 5916 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 5917 break; 5918 case -NFS4ERR_STALE_STATEID: 5919 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5920 case -NFS4ERR_EXPIRED: 5921 nfs4_schedule_lease_recovery(server->nfs_client); 5922 }; 5923 } 5924 5925 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 5926 { 5927 struct nfs4_lockdata *data; 5928 struct rpc_task *task; 5929 struct rpc_message msg = { 5930 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 5931 .rpc_cred = state->owner->so_cred, 5932 }; 5933 struct rpc_task_setup task_setup_data = { 5934 .rpc_client = NFS_CLIENT(state->inode), 5935 .rpc_message = &msg, 5936 .callback_ops = &nfs4_lock_ops, 5937 .workqueue = nfsiod_workqueue, 5938 .flags = RPC_TASK_ASYNC, 5939 }; 5940 int ret; 5941 5942 dprintk("%s: begin!\n", __func__); 5943 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 5944 fl->fl_u.nfs4_fl.owner, 5945 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 5946 if (data == NULL) 5947 return -ENOMEM; 5948 if (IS_SETLKW(cmd)) 5949 data->arg.block = 1; 5950 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5951 msg.rpc_argp = &data->arg; 5952 msg.rpc_resp = &data->res; 5953 task_setup_data.callback_data = data; 5954 if (recovery_type > NFS_LOCK_NEW) { 5955 if (recovery_type == NFS_LOCK_RECLAIM) 5956 data->arg.reclaim = NFS_LOCK_RECLAIM; 5957 nfs4_set_sequence_privileged(&data->arg.seq_args); 5958 } else 5959 data->arg.new_lock = 1; 5960 task = rpc_run_task(&task_setup_data); 5961 if (IS_ERR(task)) 5962 return PTR_ERR(task); 5963 ret = nfs4_wait_for_completion_rpc_task(task); 5964 if (ret == 0) { 5965 ret = data->rpc_status; 5966 if (ret) 5967 nfs4_handle_setlk_error(data->server, data->lsp, 5968 data->arg.new_lock_owner, ret); 5969 } else 5970 data->cancelled = 1; 5971 rpc_put_task(task); 5972 dprintk("%s: done, ret = %d!\n", __func__, ret); 5973 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 5974 return ret; 5975 } 5976 5977 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 5978 { 5979 struct nfs_server *server = NFS_SERVER(state->inode); 5980 struct nfs4_exception exception = { 5981 .inode = state->inode, 5982 }; 5983 int err; 5984 5985 do { 5986 /* Cache the lock if possible... */ 5987 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5988 return 0; 5989 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 5990 if (err != -NFS4ERR_DELAY) 5991 break; 5992 nfs4_handle_exception(server, err, &exception); 5993 } while (exception.retry); 5994 return err; 5995 } 5996 5997 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 5998 { 5999 struct nfs_server *server = NFS_SERVER(state->inode); 6000 struct nfs4_exception exception = { 6001 .inode = state->inode, 6002 }; 6003 int err; 6004 6005 err = nfs4_set_lock_state(state, request); 6006 if (err != 0) 6007 return err; 6008 if (!recover_lost_locks) { 6009 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 6010 return 0; 6011 } 6012 do { 6013 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 6014 return 0; 6015 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 6016 switch (err) { 6017 default: 6018 goto out; 6019 case -NFS4ERR_GRACE: 6020 case -NFS4ERR_DELAY: 6021 nfs4_handle_exception(server, err, &exception); 6022 err = 0; 6023 } 6024 } while (exception.retry); 6025 out: 6026 return err; 6027 } 6028 6029 #if defined(CONFIG_NFS_V4_1) 6030 /** 6031 * nfs41_check_expired_locks - possibly free a lock stateid 6032 * 6033 * @state: NFSv4 state for an inode 6034 * 6035 * Returns NFS_OK if recovery for this stateid is now finished. 6036 * Otherwise a negative NFS4ERR value is returned. 6037 */ 6038 static int nfs41_check_expired_locks(struct nfs4_state *state) 6039 { 6040 int status, ret = -NFS4ERR_BAD_STATEID; 6041 struct nfs4_lock_state *lsp; 6042 struct nfs_server *server = NFS_SERVER(state->inode); 6043 6044 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 6045 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 6046 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 6047 6048 status = nfs41_test_stateid(server, 6049 &lsp->ls_stateid, 6050 cred); 6051 trace_nfs4_test_lock_stateid(state, lsp, status); 6052 if (status != NFS_OK) { 6053 /* Free the stateid unless the server 6054 * informs us the stateid is unrecognized. */ 6055 if (status != -NFS4ERR_BAD_STATEID) 6056 nfs41_free_stateid(server, 6057 &lsp->ls_stateid, 6058 cred); 6059 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6060 ret = status; 6061 } 6062 } 6063 }; 6064 6065 return ret; 6066 } 6067 6068 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 6069 { 6070 int status = NFS_OK; 6071 6072 if (test_bit(LK_STATE_IN_USE, &state->flags)) 6073 status = nfs41_check_expired_locks(state); 6074 if (status != NFS_OK) 6075 status = nfs4_lock_expired(state, request); 6076 return status; 6077 } 6078 #endif 6079 6080 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6081 { 6082 struct nfs_inode *nfsi = NFS_I(state->inode); 6083 struct nfs4_state_owner *sp = state->owner; 6084 unsigned char fl_flags = request->fl_flags; 6085 int status = -ENOLCK; 6086 6087 if ((fl_flags & FL_POSIX) && 6088 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 6089 goto out; 6090 /* Is this a delegated open? */ 6091 status = nfs4_set_lock_state(state, request); 6092 if (status != 0) 6093 goto out; 6094 request->fl_flags |= FL_ACCESS; 6095 status = do_vfs_lock(state->inode, request); 6096 if (status < 0) 6097 goto out; 6098 mutex_lock(&sp->so_delegreturn_mutex); 6099 down_read(&nfsi->rwsem); 6100 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 6101 /* Yes: cache locks! */ 6102 /* ...but avoid races with delegation recall... */ 6103 request->fl_flags = fl_flags & ~FL_SLEEP; 6104 status = do_vfs_lock(state->inode, request); 6105 up_read(&nfsi->rwsem); 6106 mutex_unlock(&sp->so_delegreturn_mutex); 6107 goto out; 6108 } 6109 up_read(&nfsi->rwsem); 6110 mutex_unlock(&sp->so_delegreturn_mutex); 6111 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 6112 out: 6113 request->fl_flags = fl_flags; 6114 return status; 6115 } 6116 6117 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6118 { 6119 struct nfs4_exception exception = { 6120 .state = state, 6121 .inode = state->inode, 6122 }; 6123 int err; 6124 6125 do { 6126 err = _nfs4_proc_setlk(state, cmd, request); 6127 if (err == -NFS4ERR_DENIED) 6128 err = -EAGAIN; 6129 err = nfs4_handle_exception(NFS_SERVER(state->inode), 6130 err, &exception); 6131 } while (exception.retry); 6132 return err; 6133 } 6134 6135 static int 6136 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 6137 { 6138 struct nfs_open_context *ctx; 6139 struct nfs4_state *state; 6140 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 6141 int status; 6142 6143 /* verify open state */ 6144 ctx = nfs_file_open_context(filp); 6145 state = ctx->state; 6146 6147 if (request->fl_start < 0 || request->fl_end < 0) 6148 return -EINVAL; 6149 6150 if (IS_GETLK(cmd)) { 6151 if (state != NULL) 6152 return nfs4_proc_getlk(state, F_GETLK, request); 6153 return 0; 6154 } 6155 6156 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 6157 return -EINVAL; 6158 6159 if (request->fl_type == F_UNLCK) { 6160 if (state != NULL) 6161 return nfs4_proc_unlck(state, cmd, request); 6162 return 0; 6163 } 6164 6165 if (state == NULL) 6166 return -ENOLCK; 6167 /* 6168 * Don't rely on the VFS having checked the file open mode, 6169 * since it won't do this for flock() locks. 6170 */ 6171 switch (request->fl_type) { 6172 case F_RDLCK: 6173 if (!(filp->f_mode & FMODE_READ)) 6174 return -EBADF; 6175 break; 6176 case F_WRLCK: 6177 if (!(filp->f_mode & FMODE_WRITE)) 6178 return -EBADF; 6179 } 6180 6181 do { 6182 status = nfs4_proc_setlk(state, cmd, request); 6183 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6184 break; 6185 timeout = nfs4_set_lock_task_retry(timeout); 6186 status = -ERESTARTSYS; 6187 if (signalled()) 6188 break; 6189 } while(status < 0); 6190 return status; 6191 } 6192 6193 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 6194 { 6195 struct nfs_server *server = NFS_SERVER(state->inode); 6196 int err; 6197 6198 err = nfs4_set_lock_state(state, fl); 6199 if (err != 0) 6200 return err; 6201 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 6202 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 6203 } 6204 6205 struct nfs_release_lockowner_data { 6206 struct nfs4_lock_state *lsp; 6207 struct nfs_server *server; 6208 struct nfs_release_lockowner_args args; 6209 struct nfs_release_lockowner_res res; 6210 unsigned long timestamp; 6211 }; 6212 6213 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 6214 { 6215 struct nfs_release_lockowner_data *data = calldata; 6216 struct nfs_server *server = data->server; 6217 nfs40_setup_sequence(server->nfs_client->cl_slot_tbl, 6218 &data->args.seq_args, &data->res.seq_res, task); 6219 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6220 data->timestamp = jiffies; 6221 } 6222 6223 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 6224 { 6225 struct nfs_release_lockowner_data *data = calldata; 6226 struct nfs_server *server = data->server; 6227 6228 nfs40_sequence_done(task, &data->res.seq_res); 6229 6230 switch (task->tk_status) { 6231 case 0: 6232 renew_lease(server, data->timestamp); 6233 break; 6234 case -NFS4ERR_STALE_CLIENTID: 6235 case -NFS4ERR_EXPIRED: 6236 nfs4_schedule_lease_recovery(server->nfs_client); 6237 break; 6238 case -NFS4ERR_LEASE_MOVED: 6239 case -NFS4ERR_DELAY: 6240 if (nfs4_async_handle_error(task, server, 6241 NULL, NULL) == -EAGAIN) 6242 rpc_restart_call_prepare(task); 6243 } 6244 } 6245 6246 static void nfs4_release_lockowner_release(void *calldata) 6247 { 6248 struct nfs_release_lockowner_data *data = calldata; 6249 nfs4_free_lock_state(data->server, data->lsp); 6250 kfree(calldata); 6251 } 6252 6253 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6254 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6255 .rpc_call_done = nfs4_release_lockowner_done, 6256 .rpc_release = nfs4_release_lockowner_release, 6257 }; 6258 6259 static void 6260 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6261 { 6262 struct nfs_release_lockowner_data *data; 6263 struct rpc_message msg = { 6264 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6265 }; 6266 6267 if (server->nfs_client->cl_mvops->minor_version != 0) 6268 return; 6269 6270 data = kmalloc(sizeof(*data), GFP_NOFS); 6271 if (!data) 6272 return; 6273 data->lsp = lsp; 6274 data->server = server; 6275 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6276 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6277 data->args.lock_owner.s_dev = server->s_dev; 6278 6279 msg.rpc_argp = &data->args; 6280 msg.rpc_resp = &data->res; 6281 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 6282 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6283 } 6284 6285 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6286 6287 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 6288 struct dentry *unused, struct inode *inode, 6289 const char *key, const void *buf, 6290 size_t buflen, int flags) 6291 { 6292 return nfs4_proc_set_acl(inode, buf, buflen); 6293 } 6294 6295 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 6296 struct dentry *unused, struct inode *inode, 6297 const char *key, void *buf, size_t buflen) 6298 { 6299 return nfs4_proc_get_acl(inode, buf, buflen); 6300 } 6301 6302 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 6303 { 6304 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))); 6305 } 6306 6307 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6308 6309 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 6310 struct dentry *unused, struct inode *inode, 6311 const char *key, const void *buf, 6312 size_t buflen, int flags) 6313 { 6314 if (security_ismaclabel(key)) 6315 return nfs4_set_security_label(inode, buf, buflen); 6316 6317 return -EOPNOTSUPP; 6318 } 6319 6320 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 6321 struct dentry *unused, struct inode *inode, 6322 const char *key, void *buf, size_t buflen) 6323 { 6324 if (security_ismaclabel(key)) 6325 return nfs4_get_security_label(inode, buf, buflen); 6326 return -EOPNOTSUPP; 6327 } 6328 6329 static ssize_t 6330 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6331 { 6332 int len = 0; 6333 6334 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 6335 len = security_inode_listsecurity(inode, list, list_len); 6336 if (list_len && len > list_len) 6337 return -ERANGE; 6338 } 6339 return len; 6340 } 6341 6342 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6343 .prefix = XATTR_SECURITY_PREFIX, 6344 .get = nfs4_xattr_get_nfs4_label, 6345 .set = nfs4_xattr_set_nfs4_label, 6346 }; 6347 6348 #else 6349 6350 static ssize_t 6351 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 6352 { 6353 return 0; 6354 } 6355 6356 #endif 6357 6358 /* 6359 * nfs_fhget will use either the mounted_on_fileid or the fileid 6360 */ 6361 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6362 { 6363 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6364 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6365 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6366 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6367 return; 6368 6369 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6370 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6371 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6372 fattr->nlink = 2; 6373 } 6374 6375 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6376 const struct qstr *name, 6377 struct nfs4_fs_locations *fs_locations, 6378 struct page *page) 6379 { 6380 struct nfs_server *server = NFS_SERVER(dir); 6381 u32 bitmask[3] = { 6382 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6383 }; 6384 struct nfs4_fs_locations_arg args = { 6385 .dir_fh = NFS_FH(dir), 6386 .name = name, 6387 .page = page, 6388 .bitmask = bitmask, 6389 }; 6390 struct nfs4_fs_locations_res res = { 6391 .fs_locations = fs_locations, 6392 }; 6393 struct rpc_message msg = { 6394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6395 .rpc_argp = &args, 6396 .rpc_resp = &res, 6397 }; 6398 int status; 6399 6400 dprintk("%s: start\n", __func__); 6401 6402 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6403 * is not supported */ 6404 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6405 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 6406 else 6407 bitmask[0] |= FATTR4_WORD0_FILEID; 6408 6409 nfs_fattr_init(&fs_locations->fattr); 6410 fs_locations->server = server; 6411 fs_locations->nlocations = 0; 6412 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6413 dprintk("%s: returned status = %d\n", __func__, status); 6414 return status; 6415 } 6416 6417 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6418 const struct qstr *name, 6419 struct nfs4_fs_locations *fs_locations, 6420 struct page *page) 6421 { 6422 struct nfs4_exception exception = { }; 6423 int err; 6424 do { 6425 err = _nfs4_proc_fs_locations(client, dir, name, 6426 fs_locations, page); 6427 trace_nfs4_get_fs_locations(dir, name, err); 6428 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6429 &exception); 6430 } while (exception.retry); 6431 return err; 6432 } 6433 6434 /* 6435 * This operation also signals the server that this client is 6436 * performing migration recovery. The server can stop returning 6437 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 6438 * appended to this compound to identify the client ID which is 6439 * performing recovery. 6440 */ 6441 static int _nfs40_proc_get_locations(struct inode *inode, 6442 struct nfs4_fs_locations *locations, 6443 struct page *page, struct rpc_cred *cred) 6444 { 6445 struct nfs_server *server = NFS_SERVER(inode); 6446 struct rpc_clnt *clnt = server->client; 6447 u32 bitmask[2] = { 6448 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6449 }; 6450 struct nfs4_fs_locations_arg args = { 6451 .clientid = server->nfs_client->cl_clientid, 6452 .fh = NFS_FH(inode), 6453 .page = page, 6454 .bitmask = bitmask, 6455 .migration = 1, /* skip LOOKUP */ 6456 .renew = 1, /* append RENEW */ 6457 }; 6458 struct nfs4_fs_locations_res res = { 6459 .fs_locations = locations, 6460 .migration = 1, 6461 .renew = 1, 6462 }; 6463 struct rpc_message msg = { 6464 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6465 .rpc_argp = &args, 6466 .rpc_resp = &res, 6467 .rpc_cred = cred, 6468 }; 6469 unsigned long now = jiffies; 6470 int status; 6471 6472 nfs_fattr_init(&locations->fattr); 6473 locations->server = server; 6474 locations->nlocations = 0; 6475 6476 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6477 nfs4_set_sequence_privileged(&args.seq_args); 6478 status = nfs4_call_sync_sequence(clnt, server, &msg, 6479 &args.seq_args, &res.seq_res); 6480 if (status) 6481 return status; 6482 6483 renew_lease(server, now); 6484 return 0; 6485 } 6486 6487 #ifdef CONFIG_NFS_V4_1 6488 6489 /* 6490 * This operation also signals the server that this client is 6491 * performing migration recovery. The server can stop asserting 6492 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 6493 * performing this operation is identified in the SEQUENCE 6494 * operation in this compound. 6495 * 6496 * When the client supports GETATTR(fs_locations_info), it can 6497 * be plumbed in here. 6498 */ 6499 static int _nfs41_proc_get_locations(struct inode *inode, 6500 struct nfs4_fs_locations *locations, 6501 struct page *page, struct rpc_cred *cred) 6502 { 6503 struct nfs_server *server = NFS_SERVER(inode); 6504 struct rpc_clnt *clnt = server->client; 6505 u32 bitmask[2] = { 6506 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6507 }; 6508 struct nfs4_fs_locations_arg args = { 6509 .fh = NFS_FH(inode), 6510 .page = page, 6511 .bitmask = bitmask, 6512 .migration = 1, /* skip LOOKUP */ 6513 }; 6514 struct nfs4_fs_locations_res res = { 6515 .fs_locations = locations, 6516 .migration = 1, 6517 }; 6518 struct rpc_message msg = { 6519 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6520 .rpc_argp = &args, 6521 .rpc_resp = &res, 6522 .rpc_cred = cred, 6523 }; 6524 int status; 6525 6526 nfs_fattr_init(&locations->fattr); 6527 locations->server = server; 6528 locations->nlocations = 0; 6529 6530 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6531 nfs4_set_sequence_privileged(&args.seq_args); 6532 status = nfs4_call_sync_sequence(clnt, server, &msg, 6533 &args.seq_args, &res.seq_res); 6534 if (status == NFS4_OK && 6535 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6536 status = -NFS4ERR_LEASE_MOVED; 6537 return status; 6538 } 6539 6540 #endif /* CONFIG_NFS_V4_1 */ 6541 6542 /** 6543 * nfs4_proc_get_locations - discover locations for a migrated FSID 6544 * @inode: inode on FSID that is migrating 6545 * @locations: result of query 6546 * @page: buffer 6547 * @cred: credential to use for this operation 6548 * 6549 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 6550 * operation failed, or a negative errno if a local error occurred. 6551 * 6552 * On success, "locations" is filled in, but if the server has 6553 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 6554 * asserted. 6555 * 6556 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 6557 * from this client that require migration recovery. 6558 */ 6559 int nfs4_proc_get_locations(struct inode *inode, 6560 struct nfs4_fs_locations *locations, 6561 struct page *page, struct rpc_cred *cred) 6562 { 6563 struct nfs_server *server = NFS_SERVER(inode); 6564 struct nfs_client *clp = server->nfs_client; 6565 const struct nfs4_mig_recovery_ops *ops = 6566 clp->cl_mvops->mig_recovery_ops; 6567 struct nfs4_exception exception = { }; 6568 int status; 6569 6570 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6571 (unsigned long long)server->fsid.major, 6572 (unsigned long long)server->fsid.minor, 6573 clp->cl_hostname); 6574 nfs_display_fhandle(NFS_FH(inode), __func__); 6575 6576 do { 6577 status = ops->get_locations(inode, locations, page, cred); 6578 if (status != -NFS4ERR_DELAY) 6579 break; 6580 nfs4_handle_exception(server, status, &exception); 6581 } while (exception.retry); 6582 return status; 6583 } 6584 6585 /* 6586 * This operation also signals the server that this client is 6587 * performing "lease moved" recovery. The server can stop 6588 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 6589 * is appended to this compound to identify the client ID which is 6590 * performing recovery. 6591 */ 6592 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6593 { 6594 struct nfs_server *server = NFS_SERVER(inode); 6595 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 6596 struct rpc_clnt *clnt = server->client; 6597 struct nfs4_fsid_present_arg args = { 6598 .fh = NFS_FH(inode), 6599 .clientid = clp->cl_clientid, 6600 .renew = 1, /* append RENEW */ 6601 }; 6602 struct nfs4_fsid_present_res res = { 6603 .renew = 1, 6604 }; 6605 struct rpc_message msg = { 6606 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6607 .rpc_argp = &args, 6608 .rpc_resp = &res, 6609 .rpc_cred = cred, 6610 }; 6611 unsigned long now = jiffies; 6612 int status; 6613 6614 res.fh = nfs_alloc_fhandle(); 6615 if (res.fh == NULL) 6616 return -ENOMEM; 6617 6618 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6619 nfs4_set_sequence_privileged(&args.seq_args); 6620 status = nfs4_call_sync_sequence(clnt, server, &msg, 6621 &args.seq_args, &res.seq_res); 6622 nfs_free_fhandle(res.fh); 6623 if (status) 6624 return status; 6625 6626 do_renew_lease(clp, now); 6627 return 0; 6628 } 6629 6630 #ifdef CONFIG_NFS_V4_1 6631 6632 /* 6633 * This operation also signals the server that this client is 6634 * performing "lease moved" recovery. The server can stop asserting 6635 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 6636 * this operation is identified in the SEQUENCE operation in this 6637 * compound. 6638 */ 6639 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6640 { 6641 struct nfs_server *server = NFS_SERVER(inode); 6642 struct rpc_clnt *clnt = server->client; 6643 struct nfs4_fsid_present_arg args = { 6644 .fh = NFS_FH(inode), 6645 }; 6646 struct nfs4_fsid_present_res res = { 6647 }; 6648 struct rpc_message msg = { 6649 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6650 .rpc_argp = &args, 6651 .rpc_resp = &res, 6652 .rpc_cred = cred, 6653 }; 6654 int status; 6655 6656 res.fh = nfs_alloc_fhandle(); 6657 if (res.fh == NULL) 6658 return -ENOMEM; 6659 6660 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6661 nfs4_set_sequence_privileged(&args.seq_args); 6662 status = nfs4_call_sync_sequence(clnt, server, &msg, 6663 &args.seq_args, &res.seq_res); 6664 nfs_free_fhandle(res.fh); 6665 if (status == NFS4_OK && 6666 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6667 status = -NFS4ERR_LEASE_MOVED; 6668 return status; 6669 } 6670 6671 #endif /* CONFIG_NFS_V4_1 */ 6672 6673 /** 6674 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 6675 * @inode: inode on FSID to check 6676 * @cred: credential to use for this operation 6677 * 6678 * Server indicates whether the FSID is present, moved, or not 6679 * recognized. This operation is necessary to clear a LEASE_MOVED 6680 * condition for this client ID. 6681 * 6682 * Returns NFS4_OK if the FSID is present on this server, 6683 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 6684 * NFS4ERR code if some error occurred on the server, or a 6685 * negative errno if a local failure occurred. 6686 */ 6687 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6688 { 6689 struct nfs_server *server = NFS_SERVER(inode); 6690 struct nfs_client *clp = server->nfs_client; 6691 const struct nfs4_mig_recovery_ops *ops = 6692 clp->cl_mvops->mig_recovery_ops; 6693 struct nfs4_exception exception = { }; 6694 int status; 6695 6696 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6697 (unsigned long long)server->fsid.major, 6698 (unsigned long long)server->fsid.minor, 6699 clp->cl_hostname); 6700 nfs_display_fhandle(NFS_FH(inode), __func__); 6701 6702 do { 6703 status = ops->fsid_present(inode, cred); 6704 if (status != -NFS4ERR_DELAY) 6705 break; 6706 nfs4_handle_exception(server, status, &exception); 6707 } while (exception.retry); 6708 return status; 6709 } 6710 6711 /** 6712 * If 'use_integrity' is true and the state managment nfs_client 6713 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 6714 * and the machine credential as per RFC3530bis and RFC5661 Security 6715 * Considerations sections. Otherwise, just use the user cred with the 6716 * filesystem's rpc_client. 6717 */ 6718 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 6719 { 6720 int status; 6721 struct nfs4_secinfo_arg args = { 6722 .dir_fh = NFS_FH(dir), 6723 .name = name, 6724 }; 6725 struct nfs4_secinfo_res res = { 6726 .flavors = flavors, 6727 }; 6728 struct rpc_message msg = { 6729 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 6730 .rpc_argp = &args, 6731 .rpc_resp = &res, 6732 }; 6733 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 6734 struct rpc_cred *cred = NULL; 6735 6736 if (use_integrity) { 6737 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 6738 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 6739 msg.rpc_cred = cred; 6740 } 6741 6742 dprintk("NFS call secinfo %s\n", name->name); 6743 6744 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 6745 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 6746 6747 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 6748 &res.seq_res, 0); 6749 dprintk("NFS reply secinfo: %d\n", status); 6750 6751 if (cred) 6752 put_rpccred(cred); 6753 6754 return status; 6755 } 6756 6757 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 6758 struct nfs4_secinfo_flavors *flavors) 6759 { 6760 struct nfs4_exception exception = { }; 6761 int err; 6762 do { 6763 err = -NFS4ERR_WRONGSEC; 6764 6765 /* try to use integrity protection with machine cred */ 6766 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 6767 err = _nfs4_proc_secinfo(dir, name, flavors, true); 6768 6769 /* 6770 * if unable to use integrity protection, or SECINFO with 6771 * integrity protection returns NFS4ERR_WRONGSEC (which is 6772 * disallowed by spec, but exists in deployed servers) use 6773 * the current filesystem's rpc_client and the user cred. 6774 */ 6775 if (err == -NFS4ERR_WRONGSEC) 6776 err = _nfs4_proc_secinfo(dir, name, flavors, false); 6777 6778 trace_nfs4_secinfo(dir, name, err); 6779 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6780 &exception); 6781 } while (exception.retry); 6782 return err; 6783 } 6784 6785 #ifdef CONFIG_NFS_V4_1 6786 /* 6787 * Check the exchange flags returned by the server for invalid flags, having 6788 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 6789 * DS flags set. 6790 */ 6791 static int nfs4_check_cl_exchange_flags(u32 flags) 6792 { 6793 if (flags & ~EXCHGID4_FLAG_MASK_R) 6794 goto out_inval; 6795 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 6796 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 6797 goto out_inval; 6798 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 6799 goto out_inval; 6800 return NFS_OK; 6801 out_inval: 6802 return -NFS4ERR_INVAL; 6803 } 6804 6805 static bool 6806 nfs41_same_server_scope(struct nfs41_server_scope *a, 6807 struct nfs41_server_scope *b) 6808 { 6809 if (a->server_scope_sz == b->server_scope_sz && 6810 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 6811 return true; 6812 6813 return false; 6814 } 6815 6816 static void 6817 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 6818 { 6819 } 6820 6821 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 6822 .rpc_call_done = &nfs4_bind_one_conn_to_session_done, 6823 }; 6824 6825 /* 6826 * nfs4_proc_bind_one_conn_to_session() 6827 * 6828 * The 4.1 client currently uses the same TCP connection for the 6829 * fore and backchannel. 6830 */ 6831 static 6832 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 6833 struct rpc_xprt *xprt, 6834 struct nfs_client *clp, 6835 struct rpc_cred *cred) 6836 { 6837 int status; 6838 struct nfs41_bind_conn_to_session_args args = { 6839 .client = clp, 6840 .dir = NFS4_CDFC4_FORE_OR_BOTH, 6841 }; 6842 struct nfs41_bind_conn_to_session_res res; 6843 struct rpc_message msg = { 6844 .rpc_proc = 6845 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 6846 .rpc_argp = &args, 6847 .rpc_resp = &res, 6848 .rpc_cred = cred, 6849 }; 6850 struct rpc_task_setup task_setup_data = { 6851 .rpc_client = clnt, 6852 .rpc_xprt = xprt, 6853 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 6854 .rpc_message = &msg, 6855 .flags = RPC_TASK_TIMEOUT, 6856 }; 6857 struct rpc_task *task; 6858 6859 dprintk("--> %s\n", __func__); 6860 6861 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 6862 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 6863 args.dir = NFS4_CDFC4_FORE; 6864 6865 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 6866 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 6867 args.dir = NFS4_CDFC4_FORE; 6868 6869 task = rpc_run_task(&task_setup_data); 6870 if (!IS_ERR(task)) { 6871 status = task->tk_status; 6872 rpc_put_task(task); 6873 } else 6874 status = PTR_ERR(task); 6875 trace_nfs4_bind_conn_to_session(clp, status); 6876 if (status == 0) { 6877 if (memcmp(res.sessionid.data, 6878 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 6879 dprintk("NFS: %s: Session ID mismatch\n", __func__); 6880 status = -EIO; 6881 goto out; 6882 } 6883 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 6884 dprintk("NFS: %s: Unexpected direction from server\n", 6885 __func__); 6886 status = -EIO; 6887 goto out; 6888 } 6889 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 6890 dprintk("NFS: %s: Server returned RDMA mode = true\n", 6891 __func__); 6892 status = -EIO; 6893 goto out; 6894 } 6895 } 6896 out: 6897 dprintk("<-- %s status= %d\n", __func__, status); 6898 return status; 6899 } 6900 6901 struct rpc_bind_conn_calldata { 6902 struct nfs_client *clp; 6903 struct rpc_cred *cred; 6904 }; 6905 6906 static int 6907 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 6908 struct rpc_xprt *xprt, 6909 void *calldata) 6910 { 6911 struct rpc_bind_conn_calldata *p = calldata; 6912 6913 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 6914 } 6915 6916 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 6917 { 6918 struct rpc_bind_conn_calldata data = { 6919 .clp = clp, 6920 .cred = cred, 6921 }; 6922 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 6923 nfs4_proc_bind_conn_to_session_callback, &data); 6924 } 6925 6926 /* 6927 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 6928 * and operations we'd like to see to enable certain features in the allow map 6929 */ 6930 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 6931 .how = SP4_MACH_CRED, 6932 .enforce.u.words = { 6933 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6934 1 << (OP_EXCHANGE_ID - 32) | 6935 1 << (OP_CREATE_SESSION - 32) | 6936 1 << (OP_DESTROY_SESSION - 32) | 6937 1 << (OP_DESTROY_CLIENTID - 32) 6938 }, 6939 .allow.u.words = { 6940 [0] = 1 << (OP_CLOSE) | 6941 1 << (OP_OPEN_DOWNGRADE) | 6942 1 << (OP_LOCKU) | 6943 1 << (OP_DELEGRETURN) | 6944 1 << (OP_COMMIT), 6945 [1] = 1 << (OP_SECINFO - 32) | 6946 1 << (OP_SECINFO_NO_NAME - 32) | 6947 1 << (OP_LAYOUTRETURN - 32) | 6948 1 << (OP_TEST_STATEID - 32) | 6949 1 << (OP_FREE_STATEID - 32) | 6950 1 << (OP_WRITE - 32) 6951 } 6952 }; 6953 6954 /* 6955 * Select the state protection mode for client `clp' given the server results 6956 * from exchange_id in `sp'. 6957 * 6958 * Returns 0 on success, negative errno otherwise. 6959 */ 6960 static int nfs4_sp4_select_mode(struct nfs_client *clp, 6961 struct nfs41_state_protection *sp) 6962 { 6963 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 6964 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6965 1 << (OP_EXCHANGE_ID - 32) | 6966 1 << (OP_CREATE_SESSION - 32) | 6967 1 << (OP_DESTROY_SESSION - 32) | 6968 1 << (OP_DESTROY_CLIENTID - 32) 6969 }; 6970 unsigned int i; 6971 6972 if (sp->how == SP4_MACH_CRED) { 6973 /* Print state protect result */ 6974 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 6975 for (i = 0; i <= LAST_NFS4_OP; i++) { 6976 if (test_bit(i, sp->enforce.u.longs)) 6977 dfprintk(MOUNT, " enforce op %d\n", i); 6978 if (test_bit(i, sp->allow.u.longs)) 6979 dfprintk(MOUNT, " allow op %d\n", i); 6980 } 6981 6982 /* make sure nothing is on enforce list that isn't supported */ 6983 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 6984 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 6985 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6986 return -EINVAL; 6987 } 6988 } 6989 6990 /* 6991 * Minimal mode - state operations are allowed to use machine 6992 * credential. Note this already happens by default, so the 6993 * client doesn't have to do anything more than the negotiation. 6994 * 6995 * NOTE: we don't care if EXCHANGE_ID is in the list - 6996 * we're already using the machine cred for exchange_id 6997 * and will never use a different cred. 6998 */ 6999 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 7000 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 7001 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 7002 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 7003 dfprintk(MOUNT, "sp4_mach_cred:\n"); 7004 dfprintk(MOUNT, " minimal mode enabled\n"); 7005 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags); 7006 } else { 7007 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 7008 return -EINVAL; 7009 } 7010 7011 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 7012 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 7013 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 7014 test_bit(OP_LOCKU, sp->allow.u.longs)) { 7015 dfprintk(MOUNT, " cleanup mode enabled\n"); 7016 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags); 7017 } 7018 7019 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 7020 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 7021 set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, 7022 &clp->cl_sp4_flags); 7023 } 7024 7025 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 7026 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 7027 dfprintk(MOUNT, " secinfo mode enabled\n"); 7028 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags); 7029 } 7030 7031 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 7032 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 7033 dfprintk(MOUNT, " stateid mode enabled\n"); 7034 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags); 7035 } 7036 7037 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 7038 dfprintk(MOUNT, " write mode enabled\n"); 7039 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags); 7040 } 7041 7042 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 7043 dfprintk(MOUNT, " commit mode enabled\n"); 7044 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags); 7045 } 7046 } 7047 7048 return 0; 7049 } 7050 7051 /* 7052 * _nfs4_proc_exchange_id() 7053 * 7054 * Wrapper for EXCHANGE_ID operation. 7055 */ 7056 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 7057 u32 sp4_how) 7058 { 7059 nfs4_verifier verifier; 7060 struct nfs41_exchange_id_args args = { 7061 .verifier = &verifier, 7062 .client = clp, 7063 #ifdef CONFIG_NFS_V4_1_MIGRATION 7064 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 7065 EXCHGID4_FLAG_BIND_PRINC_STATEID | 7066 EXCHGID4_FLAG_SUPP_MOVED_MIGR, 7067 #else 7068 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 7069 EXCHGID4_FLAG_BIND_PRINC_STATEID, 7070 #endif 7071 }; 7072 struct nfs41_exchange_id_res res = { 7073 0 7074 }; 7075 int status; 7076 struct rpc_message msg = { 7077 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 7078 .rpc_argp = &args, 7079 .rpc_resp = &res, 7080 .rpc_cred = cred, 7081 }; 7082 7083 nfs4_init_boot_verifier(clp, &verifier); 7084 7085 status = nfs4_init_uniform_client_string(clp); 7086 if (status) 7087 goto out; 7088 7089 dprintk("NFS call exchange_id auth=%s, '%s'\n", 7090 clp->cl_rpcclient->cl_auth->au_ops->au_name, 7091 clp->cl_owner_id); 7092 7093 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 7094 GFP_NOFS); 7095 if (unlikely(res.server_owner == NULL)) { 7096 status = -ENOMEM; 7097 goto out; 7098 } 7099 7100 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 7101 GFP_NOFS); 7102 if (unlikely(res.server_scope == NULL)) { 7103 status = -ENOMEM; 7104 goto out_server_owner; 7105 } 7106 7107 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 7108 if (unlikely(res.impl_id == NULL)) { 7109 status = -ENOMEM; 7110 goto out_server_scope; 7111 } 7112 7113 switch (sp4_how) { 7114 case SP4_NONE: 7115 args.state_protect.how = SP4_NONE; 7116 break; 7117 7118 case SP4_MACH_CRED: 7119 args.state_protect = nfs4_sp4_mach_cred_request; 7120 break; 7121 7122 default: 7123 /* unsupported! */ 7124 WARN_ON_ONCE(1); 7125 status = -EINVAL; 7126 goto out_impl_id; 7127 } 7128 7129 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7130 trace_nfs4_exchange_id(clp, status); 7131 if (status == 0) 7132 status = nfs4_check_cl_exchange_flags(res.flags); 7133 7134 if (status == 0) 7135 status = nfs4_sp4_select_mode(clp, &res.state_protect); 7136 7137 if (status == 0) { 7138 clp->cl_clientid = res.clientid; 7139 clp->cl_exchange_flags = res.flags; 7140 /* Client ID is not confirmed */ 7141 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) { 7142 clear_bit(NFS4_SESSION_ESTABLISHED, 7143 &clp->cl_session->session_state); 7144 clp->cl_seqid = res.seqid; 7145 } 7146 7147 kfree(clp->cl_serverowner); 7148 clp->cl_serverowner = res.server_owner; 7149 res.server_owner = NULL; 7150 7151 /* use the most recent implementation id */ 7152 kfree(clp->cl_implid); 7153 clp->cl_implid = res.impl_id; 7154 res.impl_id = NULL; 7155 7156 if (clp->cl_serverscope != NULL && 7157 !nfs41_same_server_scope(clp->cl_serverscope, 7158 res.server_scope)) { 7159 dprintk("%s: server_scope mismatch detected\n", 7160 __func__); 7161 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 7162 kfree(clp->cl_serverscope); 7163 clp->cl_serverscope = NULL; 7164 } 7165 7166 if (clp->cl_serverscope == NULL) { 7167 clp->cl_serverscope = res.server_scope; 7168 res.server_scope = NULL; 7169 } 7170 } 7171 7172 out_impl_id: 7173 kfree(res.impl_id); 7174 out_server_scope: 7175 kfree(res.server_scope); 7176 out_server_owner: 7177 kfree(res.server_owner); 7178 out: 7179 if (clp->cl_implid != NULL) 7180 dprintk("NFS reply exchange_id: Server Implementation ID: " 7181 "domain: %s, name: %s, date: %llu,%u\n", 7182 clp->cl_implid->domain, clp->cl_implid->name, 7183 clp->cl_implid->date.seconds, 7184 clp->cl_implid->date.nseconds); 7185 dprintk("NFS reply exchange_id: %d\n", status); 7186 return status; 7187 } 7188 7189 /* 7190 * nfs4_proc_exchange_id() 7191 * 7192 * Returns zero, a negative errno, or a negative NFS4ERR status code. 7193 * 7194 * Since the clientid has expired, all compounds using sessions 7195 * associated with the stale clientid will be returning 7196 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 7197 * be in some phase of session reset. 7198 * 7199 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 7200 */ 7201 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 7202 { 7203 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 7204 int status; 7205 7206 /* try SP4_MACH_CRED if krb5i/p */ 7207 if (authflavor == RPC_AUTH_GSS_KRB5I || 7208 authflavor == RPC_AUTH_GSS_KRB5P) { 7209 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 7210 if (!status) 7211 return 0; 7212 } 7213 7214 /* try SP4_NONE */ 7215 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 7216 } 7217 7218 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 7219 struct rpc_cred *cred) 7220 { 7221 struct rpc_message msg = { 7222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 7223 .rpc_argp = clp, 7224 .rpc_cred = cred, 7225 }; 7226 int status; 7227 7228 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7229 trace_nfs4_destroy_clientid(clp, status); 7230 if (status) 7231 dprintk("NFS: Got error %d from the server %s on " 7232 "DESTROY_CLIENTID.", status, clp->cl_hostname); 7233 return status; 7234 } 7235 7236 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 7237 struct rpc_cred *cred) 7238 { 7239 unsigned int loop; 7240 int ret; 7241 7242 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 7243 ret = _nfs4_proc_destroy_clientid(clp, cred); 7244 switch (ret) { 7245 case -NFS4ERR_DELAY: 7246 case -NFS4ERR_CLIENTID_BUSY: 7247 ssleep(1); 7248 break; 7249 default: 7250 return ret; 7251 } 7252 } 7253 return 0; 7254 } 7255 7256 int nfs4_destroy_clientid(struct nfs_client *clp) 7257 { 7258 struct rpc_cred *cred; 7259 int ret = 0; 7260 7261 if (clp->cl_mvops->minor_version < 1) 7262 goto out; 7263 if (clp->cl_exchange_flags == 0) 7264 goto out; 7265 if (clp->cl_preserve_clid) 7266 goto out; 7267 cred = nfs4_get_clid_cred(clp); 7268 ret = nfs4_proc_destroy_clientid(clp, cred); 7269 if (cred) 7270 put_rpccred(cred); 7271 switch (ret) { 7272 case 0: 7273 case -NFS4ERR_STALE_CLIENTID: 7274 clp->cl_exchange_flags = 0; 7275 } 7276 out: 7277 return ret; 7278 } 7279 7280 struct nfs4_get_lease_time_data { 7281 struct nfs4_get_lease_time_args *args; 7282 struct nfs4_get_lease_time_res *res; 7283 struct nfs_client *clp; 7284 }; 7285 7286 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 7287 void *calldata) 7288 { 7289 struct nfs4_get_lease_time_data *data = 7290 (struct nfs4_get_lease_time_data *)calldata; 7291 7292 dprintk("--> %s\n", __func__); 7293 /* just setup sequence, do not trigger session recovery 7294 since we're invoked within one */ 7295 nfs41_setup_sequence(data->clp->cl_session, 7296 &data->args->la_seq_args, 7297 &data->res->lr_seq_res, 7298 task); 7299 dprintk("<-- %s\n", __func__); 7300 } 7301 7302 /* 7303 * Called from nfs4_state_manager thread for session setup, so don't recover 7304 * from sequence operation or clientid errors. 7305 */ 7306 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 7307 { 7308 struct nfs4_get_lease_time_data *data = 7309 (struct nfs4_get_lease_time_data *)calldata; 7310 7311 dprintk("--> %s\n", __func__); 7312 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 7313 return; 7314 switch (task->tk_status) { 7315 case -NFS4ERR_DELAY: 7316 case -NFS4ERR_GRACE: 7317 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 7318 rpc_delay(task, NFS4_POLL_RETRY_MIN); 7319 task->tk_status = 0; 7320 /* fall through */ 7321 case -NFS4ERR_RETRY_UNCACHED_REP: 7322 rpc_restart_call_prepare(task); 7323 return; 7324 } 7325 dprintk("<-- %s\n", __func__); 7326 } 7327 7328 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 7329 .rpc_call_prepare = nfs4_get_lease_time_prepare, 7330 .rpc_call_done = nfs4_get_lease_time_done, 7331 }; 7332 7333 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 7334 { 7335 struct rpc_task *task; 7336 struct nfs4_get_lease_time_args args; 7337 struct nfs4_get_lease_time_res res = { 7338 .lr_fsinfo = fsinfo, 7339 }; 7340 struct nfs4_get_lease_time_data data = { 7341 .args = &args, 7342 .res = &res, 7343 .clp = clp, 7344 }; 7345 struct rpc_message msg = { 7346 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 7347 .rpc_argp = &args, 7348 .rpc_resp = &res, 7349 }; 7350 struct rpc_task_setup task_setup = { 7351 .rpc_client = clp->cl_rpcclient, 7352 .rpc_message = &msg, 7353 .callback_ops = &nfs4_get_lease_time_ops, 7354 .callback_data = &data, 7355 .flags = RPC_TASK_TIMEOUT, 7356 }; 7357 int status; 7358 7359 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 7360 nfs4_set_sequence_privileged(&args.la_seq_args); 7361 dprintk("--> %s\n", __func__); 7362 task = rpc_run_task(&task_setup); 7363 7364 if (IS_ERR(task)) 7365 status = PTR_ERR(task); 7366 else { 7367 status = task->tk_status; 7368 rpc_put_task(task); 7369 } 7370 dprintk("<-- %s return %d\n", __func__, status); 7371 7372 return status; 7373 } 7374 7375 /* 7376 * Initialize the values to be used by the client in CREATE_SESSION 7377 * If nfs4_init_session set the fore channel request and response sizes, 7378 * use them. 7379 * 7380 * Set the back channel max_resp_sz_cached to zero to force the client to 7381 * always set csa_cachethis to FALSE because the current implementation 7382 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 7383 */ 7384 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 7385 struct rpc_clnt *clnt) 7386 { 7387 unsigned int max_rqst_sz, max_resp_sz; 7388 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 7389 7390 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 7391 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 7392 7393 /* Fore channel attributes */ 7394 args->fc_attrs.max_rqst_sz = max_rqst_sz; 7395 args->fc_attrs.max_resp_sz = max_resp_sz; 7396 args->fc_attrs.max_ops = NFS4_MAX_OPS; 7397 args->fc_attrs.max_reqs = max_session_slots; 7398 7399 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 7400 "max_ops=%u max_reqs=%u\n", 7401 __func__, 7402 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 7403 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 7404 7405 /* Back channel attributes */ 7406 args->bc_attrs.max_rqst_sz = max_bc_payload; 7407 args->bc_attrs.max_resp_sz = max_bc_payload; 7408 args->bc_attrs.max_resp_sz_cached = 0; 7409 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 7410 args->bc_attrs.max_reqs = NFS41_BC_MAX_CALLBACKS; 7411 7412 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 7413 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 7414 __func__, 7415 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 7416 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 7417 args->bc_attrs.max_reqs); 7418 } 7419 7420 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 7421 struct nfs41_create_session_res *res) 7422 { 7423 struct nfs4_channel_attrs *sent = &args->fc_attrs; 7424 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 7425 7426 if (rcvd->max_resp_sz > sent->max_resp_sz) 7427 return -EINVAL; 7428 /* 7429 * Our requested max_ops is the minimum we need; we're not 7430 * prepared to break up compounds into smaller pieces than that. 7431 * So, no point even trying to continue if the server won't 7432 * cooperate: 7433 */ 7434 if (rcvd->max_ops < sent->max_ops) 7435 return -EINVAL; 7436 if (rcvd->max_reqs == 0) 7437 return -EINVAL; 7438 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 7439 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 7440 return 0; 7441 } 7442 7443 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 7444 struct nfs41_create_session_res *res) 7445 { 7446 struct nfs4_channel_attrs *sent = &args->bc_attrs; 7447 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 7448 7449 if (!(res->flags & SESSION4_BACK_CHAN)) 7450 goto out; 7451 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 7452 return -EINVAL; 7453 if (rcvd->max_resp_sz < sent->max_resp_sz) 7454 return -EINVAL; 7455 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 7456 return -EINVAL; 7457 /* These would render the backchannel useless: */ 7458 if (rcvd->max_ops != sent->max_ops) 7459 return -EINVAL; 7460 if (rcvd->max_reqs != sent->max_reqs) 7461 return -EINVAL; 7462 out: 7463 return 0; 7464 } 7465 7466 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 7467 struct nfs41_create_session_res *res) 7468 { 7469 int ret; 7470 7471 ret = nfs4_verify_fore_channel_attrs(args, res); 7472 if (ret) 7473 return ret; 7474 return nfs4_verify_back_channel_attrs(args, res); 7475 } 7476 7477 static void nfs4_update_session(struct nfs4_session *session, 7478 struct nfs41_create_session_res *res) 7479 { 7480 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 7481 /* Mark client id and session as being confirmed */ 7482 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 7483 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 7484 session->flags = res->flags; 7485 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 7486 if (res->flags & SESSION4_BACK_CHAN) 7487 memcpy(&session->bc_attrs, &res->bc_attrs, 7488 sizeof(session->bc_attrs)); 7489 } 7490 7491 static int _nfs4_proc_create_session(struct nfs_client *clp, 7492 struct rpc_cred *cred) 7493 { 7494 struct nfs4_session *session = clp->cl_session; 7495 struct nfs41_create_session_args args = { 7496 .client = clp, 7497 .clientid = clp->cl_clientid, 7498 .seqid = clp->cl_seqid, 7499 .cb_program = NFS4_CALLBACK, 7500 }; 7501 struct nfs41_create_session_res res; 7502 7503 struct rpc_message msg = { 7504 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 7505 .rpc_argp = &args, 7506 .rpc_resp = &res, 7507 .rpc_cred = cred, 7508 }; 7509 int status; 7510 7511 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 7512 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 7513 7514 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7515 trace_nfs4_create_session(clp, status); 7516 7517 if (!status) { 7518 /* Verify the session's negotiated channel_attrs values */ 7519 status = nfs4_verify_channel_attrs(&args, &res); 7520 /* Increment the clientid slot sequence id */ 7521 if (clp->cl_seqid == res.seqid) 7522 clp->cl_seqid++; 7523 if (status) 7524 goto out; 7525 nfs4_update_session(session, &res); 7526 } 7527 out: 7528 return status; 7529 } 7530 7531 /* 7532 * Issues a CREATE_SESSION operation to the server. 7533 * It is the responsibility of the caller to verify the session is 7534 * expired before calling this routine. 7535 */ 7536 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 7537 { 7538 int status; 7539 unsigned *ptr; 7540 struct nfs4_session *session = clp->cl_session; 7541 7542 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 7543 7544 status = _nfs4_proc_create_session(clp, cred); 7545 if (status) 7546 goto out; 7547 7548 /* Init or reset the session slot tables */ 7549 status = nfs4_setup_session_slot_tables(session); 7550 dprintk("slot table setup returned %d\n", status); 7551 if (status) 7552 goto out; 7553 7554 ptr = (unsigned *)&session->sess_id.data[0]; 7555 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 7556 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 7557 out: 7558 dprintk("<-- %s\n", __func__); 7559 return status; 7560 } 7561 7562 /* 7563 * Issue the over-the-wire RPC DESTROY_SESSION. 7564 * The caller must serialize access to this routine. 7565 */ 7566 int nfs4_proc_destroy_session(struct nfs4_session *session, 7567 struct rpc_cred *cred) 7568 { 7569 struct rpc_message msg = { 7570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 7571 .rpc_argp = session, 7572 .rpc_cred = cred, 7573 }; 7574 int status = 0; 7575 7576 dprintk("--> nfs4_proc_destroy_session\n"); 7577 7578 /* session is still being setup */ 7579 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 7580 return 0; 7581 7582 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7583 trace_nfs4_destroy_session(session->clp, status); 7584 7585 if (status) 7586 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 7587 "Session has been destroyed regardless...\n", status); 7588 7589 dprintk("<-- nfs4_proc_destroy_session\n"); 7590 return status; 7591 } 7592 7593 /* 7594 * Renew the cl_session lease. 7595 */ 7596 struct nfs4_sequence_data { 7597 struct nfs_client *clp; 7598 struct nfs4_sequence_args args; 7599 struct nfs4_sequence_res res; 7600 }; 7601 7602 static void nfs41_sequence_release(void *data) 7603 { 7604 struct nfs4_sequence_data *calldata = data; 7605 struct nfs_client *clp = calldata->clp; 7606 7607 if (atomic_read(&clp->cl_count) > 1) 7608 nfs4_schedule_state_renewal(clp); 7609 nfs_put_client(clp); 7610 kfree(calldata); 7611 } 7612 7613 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7614 { 7615 switch(task->tk_status) { 7616 case -NFS4ERR_DELAY: 7617 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7618 return -EAGAIN; 7619 default: 7620 nfs4_schedule_lease_recovery(clp); 7621 } 7622 return 0; 7623 } 7624 7625 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 7626 { 7627 struct nfs4_sequence_data *calldata = data; 7628 struct nfs_client *clp = calldata->clp; 7629 7630 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 7631 return; 7632 7633 trace_nfs4_sequence(clp, task->tk_status); 7634 if (task->tk_status < 0) { 7635 dprintk("%s ERROR %d\n", __func__, task->tk_status); 7636 if (atomic_read(&clp->cl_count) == 1) 7637 goto out; 7638 7639 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 7640 rpc_restart_call_prepare(task); 7641 return; 7642 } 7643 } 7644 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 7645 out: 7646 dprintk("<-- %s\n", __func__); 7647 } 7648 7649 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 7650 { 7651 struct nfs4_sequence_data *calldata = data; 7652 struct nfs_client *clp = calldata->clp; 7653 struct nfs4_sequence_args *args; 7654 struct nfs4_sequence_res *res; 7655 7656 args = task->tk_msg.rpc_argp; 7657 res = task->tk_msg.rpc_resp; 7658 7659 nfs41_setup_sequence(clp->cl_session, args, res, task); 7660 } 7661 7662 static const struct rpc_call_ops nfs41_sequence_ops = { 7663 .rpc_call_done = nfs41_sequence_call_done, 7664 .rpc_call_prepare = nfs41_sequence_prepare, 7665 .rpc_release = nfs41_sequence_release, 7666 }; 7667 7668 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 7669 struct rpc_cred *cred, 7670 bool is_privileged) 7671 { 7672 struct nfs4_sequence_data *calldata; 7673 struct rpc_message msg = { 7674 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 7675 .rpc_cred = cred, 7676 }; 7677 struct rpc_task_setup task_setup_data = { 7678 .rpc_client = clp->cl_rpcclient, 7679 .rpc_message = &msg, 7680 .callback_ops = &nfs41_sequence_ops, 7681 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 7682 }; 7683 7684 if (!atomic_inc_not_zero(&clp->cl_count)) 7685 return ERR_PTR(-EIO); 7686 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7687 if (calldata == NULL) { 7688 nfs_put_client(clp); 7689 return ERR_PTR(-ENOMEM); 7690 } 7691 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 7692 if (is_privileged) 7693 nfs4_set_sequence_privileged(&calldata->args); 7694 msg.rpc_argp = &calldata->args; 7695 msg.rpc_resp = &calldata->res; 7696 calldata->clp = clp; 7697 task_setup_data.callback_data = calldata; 7698 7699 return rpc_run_task(&task_setup_data); 7700 } 7701 7702 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 7703 { 7704 struct rpc_task *task; 7705 int ret = 0; 7706 7707 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 7708 return -EAGAIN; 7709 task = _nfs41_proc_sequence(clp, cred, false); 7710 if (IS_ERR(task)) 7711 ret = PTR_ERR(task); 7712 else 7713 rpc_put_task_async(task); 7714 dprintk("<-- %s status=%d\n", __func__, ret); 7715 return ret; 7716 } 7717 7718 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 7719 { 7720 struct rpc_task *task; 7721 int ret; 7722 7723 task = _nfs41_proc_sequence(clp, cred, true); 7724 if (IS_ERR(task)) { 7725 ret = PTR_ERR(task); 7726 goto out; 7727 } 7728 ret = rpc_wait_for_completion_task(task); 7729 if (!ret) 7730 ret = task->tk_status; 7731 rpc_put_task(task); 7732 out: 7733 dprintk("<-- %s status=%d\n", __func__, ret); 7734 return ret; 7735 } 7736 7737 struct nfs4_reclaim_complete_data { 7738 struct nfs_client *clp; 7739 struct nfs41_reclaim_complete_args arg; 7740 struct nfs41_reclaim_complete_res res; 7741 }; 7742 7743 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 7744 { 7745 struct nfs4_reclaim_complete_data *calldata = data; 7746 7747 nfs41_setup_sequence(calldata->clp->cl_session, 7748 &calldata->arg.seq_args, 7749 &calldata->res.seq_res, 7750 task); 7751 } 7752 7753 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7754 { 7755 switch(task->tk_status) { 7756 case 0: 7757 case -NFS4ERR_COMPLETE_ALREADY: 7758 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 7759 break; 7760 case -NFS4ERR_DELAY: 7761 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7762 /* fall through */ 7763 case -NFS4ERR_RETRY_UNCACHED_REP: 7764 return -EAGAIN; 7765 default: 7766 nfs4_schedule_lease_recovery(clp); 7767 } 7768 return 0; 7769 } 7770 7771 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 7772 { 7773 struct nfs4_reclaim_complete_data *calldata = data; 7774 struct nfs_client *clp = calldata->clp; 7775 struct nfs4_sequence_res *res = &calldata->res.seq_res; 7776 7777 dprintk("--> %s\n", __func__); 7778 if (!nfs41_sequence_done(task, res)) 7779 return; 7780 7781 trace_nfs4_reclaim_complete(clp, task->tk_status); 7782 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 7783 rpc_restart_call_prepare(task); 7784 return; 7785 } 7786 dprintk("<-- %s\n", __func__); 7787 } 7788 7789 static void nfs4_free_reclaim_complete_data(void *data) 7790 { 7791 struct nfs4_reclaim_complete_data *calldata = data; 7792 7793 kfree(calldata); 7794 } 7795 7796 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 7797 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 7798 .rpc_call_done = nfs4_reclaim_complete_done, 7799 .rpc_release = nfs4_free_reclaim_complete_data, 7800 }; 7801 7802 /* 7803 * Issue a global reclaim complete. 7804 */ 7805 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 7806 struct rpc_cred *cred) 7807 { 7808 struct nfs4_reclaim_complete_data *calldata; 7809 struct rpc_task *task; 7810 struct rpc_message msg = { 7811 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 7812 .rpc_cred = cred, 7813 }; 7814 struct rpc_task_setup task_setup_data = { 7815 .rpc_client = clp->cl_rpcclient, 7816 .rpc_message = &msg, 7817 .callback_ops = &nfs4_reclaim_complete_call_ops, 7818 .flags = RPC_TASK_ASYNC, 7819 }; 7820 int status = -ENOMEM; 7821 7822 dprintk("--> %s\n", __func__); 7823 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7824 if (calldata == NULL) 7825 goto out; 7826 calldata->clp = clp; 7827 calldata->arg.one_fs = 0; 7828 7829 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 7830 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 7831 msg.rpc_argp = &calldata->arg; 7832 msg.rpc_resp = &calldata->res; 7833 task_setup_data.callback_data = calldata; 7834 task = rpc_run_task(&task_setup_data); 7835 if (IS_ERR(task)) { 7836 status = PTR_ERR(task); 7837 goto out; 7838 } 7839 status = nfs4_wait_for_completion_rpc_task(task); 7840 if (status == 0) 7841 status = task->tk_status; 7842 rpc_put_task(task); 7843 return 0; 7844 out: 7845 dprintk("<-- %s status=%d\n", __func__, status); 7846 return status; 7847 } 7848 7849 static void 7850 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 7851 { 7852 struct nfs4_layoutget *lgp = calldata; 7853 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 7854 struct nfs4_session *session = nfs4_get_session(server); 7855 7856 dprintk("--> %s\n", __func__); 7857 nfs41_setup_sequence(session, &lgp->args.seq_args, 7858 &lgp->res.seq_res, task); 7859 dprintk("<-- %s\n", __func__); 7860 } 7861 7862 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 7863 { 7864 struct nfs4_layoutget *lgp = calldata; 7865 7866 dprintk("--> %s\n", __func__); 7867 nfs41_sequence_done(task, &lgp->res.seq_res); 7868 dprintk("<-- %s\n", __func__); 7869 } 7870 7871 static int 7872 nfs4_layoutget_handle_exception(struct rpc_task *task, 7873 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 7874 { 7875 struct inode *inode = lgp->args.inode; 7876 struct nfs_server *server = NFS_SERVER(inode); 7877 struct pnfs_layout_hdr *lo; 7878 int nfs4err = task->tk_status; 7879 int err, status = 0; 7880 LIST_HEAD(head); 7881 7882 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 7883 7884 switch (nfs4err) { 7885 case 0: 7886 goto out; 7887 7888 /* 7889 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 7890 * on the file. set tk_status to -ENODATA to tell upper layer to 7891 * retry go inband. 7892 */ 7893 case -NFS4ERR_LAYOUTUNAVAILABLE: 7894 status = -ENODATA; 7895 goto out; 7896 /* 7897 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 7898 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 7899 */ 7900 case -NFS4ERR_BADLAYOUT: 7901 status = -EOVERFLOW; 7902 goto out; 7903 /* 7904 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 7905 * (or clients) writing to the same RAID stripe except when 7906 * the minlength argument is 0 (see RFC5661 section 18.43.3). 7907 * 7908 * Treat it like we would RECALLCONFLICT -- we retry for a little 7909 * while, and then eventually give up. 7910 */ 7911 case -NFS4ERR_LAYOUTTRYLATER: 7912 if (lgp->args.minlength == 0) { 7913 status = -EOVERFLOW; 7914 goto out; 7915 } 7916 status = -EBUSY; 7917 break; 7918 case -NFS4ERR_RECALLCONFLICT: 7919 status = -ERECALLCONFLICT; 7920 break; 7921 case -NFS4ERR_EXPIRED: 7922 case -NFS4ERR_BAD_STATEID: 7923 exception->timeout = 0; 7924 spin_lock(&inode->i_lock); 7925 lo = NFS_I(inode)->layout; 7926 /* If the open stateid was bad, then recover it. */ 7927 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 7928 nfs4_stateid_match_other(&lgp->args.stateid, 7929 &lgp->args.ctx->state->stateid)) { 7930 spin_unlock(&inode->i_lock); 7931 exception->state = lgp->args.ctx->state; 7932 break; 7933 } 7934 7935 /* 7936 * Mark the bad layout state as invalid, then retry 7937 */ 7938 pnfs_mark_layout_stateid_invalid(lo, &head); 7939 spin_unlock(&inode->i_lock); 7940 pnfs_free_lseg_list(&head); 7941 status = -EAGAIN; 7942 goto out; 7943 } 7944 7945 err = nfs4_handle_exception(server, nfs4err, exception); 7946 if (!status) { 7947 if (exception->retry) 7948 status = -EAGAIN; 7949 else 7950 status = err; 7951 } 7952 out: 7953 dprintk("<-- %s\n", __func__); 7954 return status; 7955 } 7956 7957 static size_t max_response_pages(struct nfs_server *server) 7958 { 7959 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 7960 return nfs_page_array_len(0, max_resp_sz); 7961 } 7962 7963 static void nfs4_free_pages(struct page **pages, size_t size) 7964 { 7965 int i; 7966 7967 if (!pages) 7968 return; 7969 7970 for (i = 0; i < size; i++) { 7971 if (!pages[i]) 7972 break; 7973 __free_page(pages[i]); 7974 } 7975 kfree(pages); 7976 } 7977 7978 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 7979 { 7980 struct page **pages; 7981 int i; 7982 7983 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 7984 if (!pages) { 7985 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 7986 return NULL; 7987 } 7988 7989 for (i = 0; i < size; i++) { 7990 pages[i] = alloc_page(gfp_flags); 7991 if (!pages[i]) { 7992 dprintk("%s: failed to allocate page\n", __func__); 7993 nfs4_free_pages(pages, size); 7994 return NULL; 7995 } 7996 } 7997 7998 return pages; 7999 } 8000 8001 static void nfs4_layoutget_release(void *calldata) 8002 { 8003 struct nfs4_layoutget *lgp = calldata; 8004 struct inode *inode = lgp->args.inode; 8005 struct nfs_server *server = NFS_SERVER(inode); 8006 size_t max_pages = max_response_pages(server); 8007 8008 dprintk("--> %s\n", __func__); 8009 nfs4_free_pages(lgp->args.layout.pages, max_pages); 8010 pnfs_put_layout_hdr(NFS_I(inode)->layout); 8011 put_nfs_open_context(lgp->args.ctx); 8012 kfree(calldata); 8013 dprintk("<-- %s\n", __func__); 8014 } 8015 8016 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 8017 .rpc_call_prepare = nfs4_layoutget_prepare, 8018 .rpc_call_done = nfs4_layoutget_done, 8019 .rpc_release = nfs4_layoutget_release, 8020 }; 8021 8022 struct pnfs_layout_segment * 8023 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags) 8024 { 8025 struct inode *inode = lgp->args.inode; 8026 struct nfs_server *server = NFS_SERVER(inode); 8027 size_t max_pages = max_response_pages(server); 8028 struct rpc_task *task; 8029 struct rpc_message msg = { 8030 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 8031 .rpc_argp = &lgp->args, 8032 .rpc_resp = &lgp->res, 8033 .rpc_cred = lgp->cred, 8034 }; 8035 struct rpc_task_setup task_setup_data = { 8036 .rpc_client = server->client, 8037 .rpc_message = &msg, 8038 .callback_ops = &nfs4_layoutget_call_ops, 8039 .callback_data = lgp, 8040 .flags = RPC_TASK_ASYNC, 8041 }; 8042 struct pnfs_layout_segment *lseg = NULL; 8043 struct nfs4_exception exception = { 8044 .inode = inode, 8045 .timeout = *timeout, 8046 }; 8047 int status = 0; 8048 8049 dprintk("--> %s\n", __func__); 8050 8051 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 8052 pnfs_get_layout_hdr(NFS_I(inode)->layout); 8053 8054 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 8055 if (!lgp->args.layout.pages) { 8056 nfs4_layoutget_release(lgp); 8057 return ERR_PTR(-ENOMEM); 8058 } 8059 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 8060 8061 lgp->res.layoutp = &lgp->args.layout; 8062 lgp->res.seq_res.sr_slot = NULL; 8063 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 8064 8065 task = rpc_run_task(&task_setup_data); 8066 if (IS_ERR(task)) 8067 return ERR_CAST(task); 8068 status = nfs4_wait_for_completion_rpc_task(task); 8069 if (status == 0) { 8070 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 8071 *timeout = exception.timeout; 8072 } 8073 8074 trace_nfs4_layoutget(lgp->args.ctx, 8075 &lgp->args.range, 8076 &lgp->res.range, 8077 &lgp->res.stateid, 8078 status); 8079 8080 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 8081 if (status == 0 && lgp->res.layoutp->len) 8082 lseg = pnfs_layout_process(lgp); 8083 rpc_put_task(task); 8084 dprintk("<-- %s status=%d\n", __func__, status); 8085 if (status) 8086 return ERR_PTR(status); 8087 return lseg; 8088 } 8089 8090 static void 8091 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 8092 { 8093 struct nfs4_layoutreturn *lrp = calldata; 8094 8095 dprintk("--> %s\n", __func__); 8096 nfs41_setup_sequence(lrp->clp->cl_session, 8097 &lrp->args.seq_args, 8098 &lrp->res.seq_res, 8099 task); 8100 } 8101 8102 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 8103 { 8104 struct nfs4_layoutreturn *lrp = calldata; 8105 struct nfs_server *server; 8106 8107 dprintk("--> %s\n", __func__); 8108 8109 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 8110 return; 8111 8112 server = NFS_SERVER(lrp->args.inode); 8113 switch (task->tk_status) { 8114 default: 8115 task->tk_status = 0; 8116 case 0: 8117 break; 8118 case -NFS4ERR_DELAY: 8119 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 8120 break; 8121 rpc_restart_call_prepare(task); 8122 return; 8123 } 8124 dprintk("<-- %s\n", __func__); 8125 } 8126 8127 static void nfs4_layoutreturn_release(void *calldata) 8128 { 8129 struct nfs4_layoutreturn *lrp = calldata; 8130 struct pnfs_layout_hdr *lo = lrp->args.layout; 8131 LIST_HEAD(freeme); 8132 8133 dprintk("--> %s\n", __func__); 8134 spin_lock(&lo->plh_inode->i_lock); 8135 pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range, 8136 be32_to_cpu(lrp->args.stateid.seqid)); 8137 if (lrp->res.lrs_present && pnfs_layout_is_valid(lo)) 8138 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 8139 pnfs_clear_layoutreturn_waitbit(lo); 8140 spin_unlock(&lo->plh_inode->i_lock); 8141 pnfs_free_lseg_list(&freeme); 8142 pnfs_put_layout_hdr(lrp->args.layout); 8143 nfs_iput_and_deactive(lrp->inode); 8144 kfree(calldata); 8145 dprintk("<-- %s\n", __func__); 8146 } 8147 8148 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 8149 .rpc_call_prepare = nfs4_layoutreturn_prepare, 8150 .rpc_call_done = nfs4_layoutreturn_done, 8151 .rpc_release = nfs4_layoutreturn_release, 8152 }; 8153 8154 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 8155 { 8156 struct rpc_task *task; 8157 struct rpc_message msg = { 8158 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 8159 .rpc_argp = &lrp->args, 8160 .rpc_resp = &lrp->res, 8161 .rpc_cred = lrp->cred, 8162 }; 8163 struct rpc_task_setup task_setup_data = { 8164 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 8165 .rpc_message = &msg, 8166 .callback_ops = &nfs4_layoutreturn_call_ops, 8167 .callback_data = lrp, 8168 }; 8169 int status = 0; 8170 8171 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 8172 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 8173 &task_setup_data.rpc_client, &msg); 8174 8175 dprintk("--> %s\n", __func__); 8176 if (!sync) { 8177 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 8178 if (!lrp->inode) { 8179 nfs4_layoutreturn_release(lrp); 8180 return -EAGAIN; 8181 } 8182 task_setup_data.flags |= RPC_TASK_ASYNC; 8183 } 8184 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 8185 task = rpc_run_task(&task_setup_data); 8186 if (IS_ERR(task)) 8187 return PTR_ERR(task); 8188 if (sync) 8189 status = task->tk_status; 8190 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 8191 dprintk("<-- %s status=%d\n", __func__, status); 8192 rpc_put_task(task); 8193 return status; 8194 } 8195 8196 static int 8197 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 8198 struct pnfs_device *pdev, 8199 struct rpc_cred *cred) 8200 { 8201 struct nfs4_getdeviceinfo_args args = { 8202 .pdev = pdev, 8203 .notify_types = NOTIFY_DEVICEID4_CHANGE | 8204 NOTIFY_DEVICEID4_DELETE, 8205 }; 8206 struct nfs4_getdeviceinfo_res res = { 8207 .pdev = pdev, 8208 }; 8209 struct rpc_message msg = { 8210 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 8211 .rpc_argp = &args, 8212 .rpc_resp = &res, 8213 .rpc_cred = cred, 8214 }; 8215 int status; 8216 8217 dprintk("--> %s\n", __func__); 8218 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 8219 if (res.notification & ~args.notify_types) 8220 dprintk("%s: unsupported notification\n", __func__); 8221 if (res.notification != args.notify_types) 8222 pdev->nocache = 1; 8223 8224 dprintk("<-- %s status=%d\n", __func__, status); 8225 8226 return status; 8227 } 8228 8229 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 8230 struct pnfs_device *pdev, 8231 struct rpc_cred *cred) 8232 { 8233 struct nfs4_exception exception = { }; 8234 int err; 8235 8236 do { 8237 err = nfs4_handle_exception(server, 8238 _nfs4_proc_getdeviceinfo(server, pdev, cred), 8239 &exception); 8240 } while (exception.retry); 8241 return err; 8242 } 8243 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 8244 8245 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 8246 { 8247 struct nfs4_layoutcommit_data *data = calldata; 8248 struct nfs_server *server = NFS_SERVER(data->args.inode); 8249 struct nfs4_session *session = nfs4_get_session(server); 8250 8251 nfs41_setup_sequence(session, 8252 &data->args.seq_args, 8253 &data->res.seq_res, 8254 task); 8255 } 8256 8257 static void 8258 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 8259 { 8260 struct nfs4_layoutcommit_data *data = calldata; 8261 struct nfs_server *server = NFS_SERVER(data->args.inode); 8262 8263 if (!nfs41_sequence_done(task, &data->res.seq_res)) 8264 return; 8265 8266 switch (task->tk_status) { /* Just ignore these failures */ 8267 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 8268 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 8269 case -NFS4ERR_BADLAYOUT: /* no layout */ 8270 case -NFS4ERR_GRACE: /* loca_recalim always false */ 8271 task->tk_status = 0; 8272 case 0: 8273 break; 8274 default: 8275 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 8276 rpc_restart_call_prepare(task); 8277 return; 8278 } 8279 } 8280 } 8281 8282 static void nfs4_layoutcommit_release(void *calldata) 8283 { 8284 struct nfs4_layoutcommit_data *data = calldata; 8285 8286 pnfs_cleanup_layoutcommit(data); 8287 nfs_post_op_update_inode_force_wcc(data->args.inode, 8288 data->res.fattr); 8289 put_rpccred(data->cred); 8290 nfs_iput_and_deactive(data->inode); 8291 kfree(data); 8292 } 8293 8294 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 8295 .rpc_call_prepare = nfs4_layoutcommit_prepare, 8296 .rpc_call_done = nfs4_layoutcommit_done, 8297 .rpc_release = nfs4_layoutcommit_release, 8298 }; 8299 8300 int 8301 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 8302 { 8303 struct rpc_message msg = { 8304 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 8305 .rpc_argp = &data->args, 8306 .rpc_resp = &data->res, 8307 .rpc_cred = data->cred, 8308 }; 8309 struct rpc_task_setup task_setup_data = { 8310 .task = &data->task, 8311 .rpc_client = NFS_CLIENT(data->args.inode), 8312 .rpc_message = &msg, 8313 .callback_ops = &nfs4_layoutcommit_ops, 8314 .callback_data = data, 8315 }; 8316 struct rpc_task *task; 8317 int status = 0; 8318 8319 dprintk("NFS: initiating layoutcommit call. sync %d " 8320 "lbw: %llu inode %lu\n", sync, 8321 data->args.lastbytewritten, 8322 data->args.inode->i_ino); 8323 8324 if (!sync) { 8325 data->inode = nfs_igrab_and_active(data->args.inode); 8326 if (data->inode == NULL) { 8327 nfs4_layoutcommit_release(data); 8328 return -EAGAIN; 8329 } 8330 task_setup_data.flags = RPC_TASK_ASYNC; 8331 } 8332 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 8333 task = rpc_run_task(&task_setup_data); 8334 if (IS_ERR(task)) 8335 return PTR_ERR(task); 8336 if (sync) 8337 status = task->tk_status; 8338 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 8339 dprintk("%s: status %d\n", __func__, status); 8340 rpc_put_task(task); 8341 return status; 8342 } 8343 8344 /** 8345 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 8346 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 8347 */ 8348 static int 8349 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 8350 struct nfs_fsinfo *info, 8351 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8352 { 8353 struct nfs41_secinfo_no_name_args args = { 8354 .style = SECINFO_STYLE_CURRENT_FH, 8355 }; 8356 struct nfs4_secinfo_res res = { 8357 .flavors = flavors, 8358 }; 8359 struct rpc_message msg = { 8360 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 8361 .rpc_argp = &args, 8362 .rpc_resp = &res, 8363 }; 8364 struct rpc_clnt *clnt = server->client; 8365 struct rpc_cred *cred = NULL; 8366 int status; 8367 8368 if (use_integrity) { 8369 clnt = server->nfs_client->cl_rpcclient; 8370 cred = nfs4_get_clid_cred(server->nfs_client); 8371 msg.rpc_cred = cred; 8372 } 8373 8374 dprintk("--> %s\n", __func__); 8375 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 8376 &res.seq_res, 0); 8377 dprintk("<-- %s status=%d\n", __func__, status); 8378 8379 if (cred) 8380 put_rpccred(cred); 8381 8382 return status; 8383 } 8384 8385 static int 8386 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 8387 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 8388 { 8389 struct nfs4_exception exception = { }; 8390 int err; 8391 do { 8392 /* first try using integrity protection */ 8393 err = -NFS4ERR_WRONGSEC; 8394 8395 /* try to use integrity protection with machine cred */ 8396 if (_nfs4_is_integrity_protected(server->nfs_client)) 8397 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8398 flavors, true); 8399 8400 /* 8401 * if unable to use integrity protection, or SECINFO with 8402 * integrity protection returns NFS4ERR_WRONGSEC (which is 8403 * disallowed by spec, but exists in deployed servers) use 8404 * the current filesystem's rpc_client and the user cred. 8405 */ 8406 if (err == -NFS4ERR_WRONGSEC) 8407 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8408 flavors, false); 8409 8410 switch (err) { 8411 case 0: 8412 case -NFS4ERR_WRONGSEC: 8413 case -ENOTSUPP: 8414 goto out; 8415 default: 8416 err = nfs4_handle_exception(server, err, &exception); 8417 } 8418 } while (exception.retry); 8419 out: 8420 return err; 8421 } 8422 8423 static int 8424 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 8425 struct nfs_fsinfo *info) 8426 { 8427 int err; 8428 struct page *page; 8429 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 8430 struct nfs4_secinfo_flavors *flavors; 8431 struct nfs4_secinfo4 *secinfo; 8432 int i; 8433 8434 page = alloc_page(GFP_KERNEL); 8435 if (!page) { 8436 err = -ENOMEM; 8437 goto out; 8438 } 8439 8440 flavors = page_address(page); 8441 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 8442 8443 /* 8444 * Fall back on "guess and check" method if 8445 * the server doesn't support SECINFO_NO_NAME 8446 */ 8447 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 8448 err = nfs4_find_root_sec(server, fhandle, info); 8449 goto out_freepage; 8450 } 8451 if (err) 8452 goto out_freepage; 8453 8454 for (i = 0; i < flavors->num_flavors; i++) { 8455 secinfo = &flavors->flavors[i]; 8456 8457 switch (secinfo->flavor) { 8458 case RPC_AUTH_NULL: 8459 case RPC_AUTH_UNIX: 8460 case RPC_AUTH_GSS: 8461 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 8462 &secinfo->flavor_info); 8463 break; 8464 default: 8465 flavor = RPC_AUTH_MAXFLAVOR; 8466 break; 8467 } 8468 8469 if (!nfs_auth_info_match(&server->auth_info, flavor)) 8470 flavor = RPC_AUTH_MAXFLAVOR; 8471 8472 if (flavor != RPC_AUTH_MAXFLAVOR) { 8473 err = nfs4_lookup_root_sec(server, fhandle, 8474 info, flavor); 8475 if (!err) 8476 break; 8477 } 8478 } 8479 8480 if (flavor == RPC_AUTH_MAXFLAVOR) 8481 err = -EPERM; 8482 8483 out_freepage: 8484 put_page(page); 8485 if (err == -EACCES) 8486 return -EPERM; 8487 out: 8488 return err; 8489 } 8490 8491 static int _nfs41_test_stateid(struct nfs_server *server, 8492 nfs4_stateid *stateid, 8493 struct rpc_cred *cred) 8494 { 8495 int status; 8496 struct nfs41_test_stateid_args args = { 8497 .stateid = stateid, 8498 }; 8499 struct nfs41_test_stateid_res res; 8500 struct rpc_message msg = { 8501 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 8502 .rpc_argp = &args, 8503 .rpc_resp = &res, 8504 .rpc_cred = cred, 8505 }; 8506 struct rpc_clnt *rpc_client = server->client; 8507 8508 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8509 &rpc_client, &msg); 8510 8511 dprintk("NFS call test_stateid %p\n", stateid); 8512 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 8513 nfs4_set_sequence_privileged(&args.seq_args); 8514 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 8515 &args.seq_args, &res.seq_res); 8516 if (status != NFS_OK) { 8517 dprintk("NFS reply test_stateid: failed, %d\n", status); 8518 return status; 8519 } 8520 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 8521 return -res.status; 8522 } 8523 8524 /** 8525 * nfs41_test_stateid - perform a TEST_STATEID operation 8526 * 8527 * @server: server / transport on which to perform the operation 8528 * @stateid: state ID to test 8529 * @cred: credential 8530 * 8531 * Returns NFS_OK if the server recognizes that "stateid" is valid. 8532 * Otherwise a negative NFS4ERR value is returned if the operation 8533 * failed or the state ID is not currently valid. 8534 */ 8535 static int nfs41_test_stateid(struct nfs_server *server, 8536 nfs4_stateid *stateid, 8537 struct rpc_cred *cred) 8538 { 8539 struct nfs4_exception exception = { }; 8540 int err; 8541 do { 8542 err = _nfs41_test_stateid(server, stateid, cred); 8543 if (err != -NFS4ERR_DELAY) 8544 break; 8545 nfs4_handle_exception(server, err, &exception); 8546 } while (exception.retry); 8547 return err; 8548 } 8549 8550 struct nfs_free_stateid_data { 8551 struct nfs_server *server; 8552 struct nfs41_free_stateid_args args; 8553 struct nfs41_free_stateid_res res; 8554 }; 8555 8556 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 8557 { 8558 struct nfs_free_stateid_data *data = calldata; 8559 nfs41_setup_sequence(nfs4_get_session(data->server), 8560 &data->args.seq_args, 8561 &data->res.seq_res, 8562 task); 8563 } 8564 8565 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 8566 { 8567 struct nfs_free_stateid_data *data = calldata; 8568 8569 nfs41_sequence_done(task, &data->res.seq_res); 8570 8571 switch (task->tk_status) { 8572 case -NFS4ERR_DELAY: 8573 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 8574 rpc_restart_call_prepare(task); 8575 } 8576 } 8577 8578 static void nfs41_free_stateid_release(void *calldata) 8579 { 8580 kfree(calldata); 8581 } 8582 8583 static const struct rpc_call_ops nfs41_free_stateid_ops = { 8584 .rpc_call_prepare = nfs41_free_stateid_prepare, 8585 .rpc_call_done = nfs41_free_stateid_done, 8586 .rpc_release = nfs41_free_stateid_release, 8587 }; 8588 8589 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 8590 nfs4_stateid *stateid, 8591 struct rpc_cred *cred, 8592 bool privileged) 8593 { 8594 struct rpc_message msg = { 8595 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 8596 .rpc_cred = cred, 8597 }; 8598 struct rpc_task_setup task_setup = { 8599 .rpc_client = server->client, 8600 .rpc_message = &msg, 8601 .callback_ops = &nfs41_free_stateid_ops, 8602 .flags = RPC_TASK_ASYNC, 8603 }; 8604 struct nfs_free_stateid_data *data; 8605 8606 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8607 &task_setup.rpc_client, &msg); 8608 8609 dprintk("NFS call free_stateid %p\n", stateid); 8610 data = kmalloc(sizeof(*data), GFP_NOFS); 8611 if (!data) 8612 return ERR_PTR(-ENOMEM); 8613 data->server = server; 8614 nfs4_stateid_copy(&data->args.stateid, stateid); 8615 8616 task_setup.callback_data = data; 8617 8618 msg.rpc_argp = &data->args; 8619 msg.rpc_resp = &data->res; 8620 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 8621 if (privileged) 8622 nfs4_set_sequence_privileged(&data->args.seq_args); 8623 8624 return rpc_run_task(&task_setup); 8625 } 8626 8627 /** 8628 * nfs41_free_stateid - perform a FREE_STATEID operation 8629 * 8630 * @server: server / transport on which to perform the operation 8631 * @stateid: state ID to release 8632 * @cred: credential 8633 * 8634 * Returns NFS_OK if the server freed "stateid". Otherwise a 8635 * negative NFS4ERR value is returned. 8636 */ 8637 static int nfs41_free_stateid(struct nfs_server *server, 8638 nfs4_stateid *stateid, 8639 struct rpc_cred *cred) 8640 { 8641 struct rpc_task *task; 8642 int ret; 8643 8644 task = _nfs41_free_stateid(server, stateid, cred, true); 8645 if (IS_ERR(task)) 8646 return PTR_ERR(task); 8647 ret = rpc_wait_for_completion_task(task); 8648 if (!ret) 8649 ret = task->tk_status; 8650 rpc_put_task(task); 8651 return ret; 8652 } 8653 8654 static void 8655 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 8656 { 8657 struct rpc_task *task; 8658 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 8659 8660 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 8661 nfs4_free_lock_state(server, lsp); 8662 if (IS_ERR(task)) 8663 return; 8664 rpc_put_task(task); 8665 } 8666 8667 static bool nfs41_match_stateid(const nfs4_stateid *s1, 8668 const nfs4_stateid *s2) 8669 { 8670 if (s1->type != s2->type) 8671 return false; 8672 8673 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 8674 return false; 8675 8676 if (s1->seqid == s2->seqid) 8677 return true; 8678 if (s1->seqid == 0 || s2->seqid == 0) 8679 return true; 8680 8681 return false; 8682 } 8683 8684 #endif /* CONFIG_NFS_V4_1 */ 8685 8686 static bool nfs4_match_stateid(const nfs4_stateid *s1, 8687 const nfs4_stateid *s2) 8688 { 8689 return nfs4_stateid_match(s1, s2); 8690 } 8691 8692 8693 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 8694 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8695 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8696 .recover_open = nfs4_open_reclaim, 8697 .recover_lock = nfs4_lock_reclaim, 8698 .establish_clid = nfs4_init_clientid, 8699 .detect_trunking = nfs40_discover_server_trunking, 8700 }; 8701 8702 #if defined(CONFIG_NFS_V4_1) 8703 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 8704 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8705 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8706 .recover_open = nfs4_open_reclaim, 8707 .recover_lock = nfs4_lock_reclaim, 8708 .establish_clid = nfs41_init_clientid, 8709 .reclaim_complete = nfs41_proc_reclaim_complete, 8710 .detect_trunking = nfs41_discover_server_trunking, 8711 }; 8712 #endif /* CONFIG_NFS_V4_1 */ 8713 8714 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 8715 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8716 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8717 .recover_open = nfs40_open_expired, 8718 .recover_lock = nfs4_lock_expired, 8719 .establish_clid = nfs4_init_clientid, 8720 }; 8721 8722 #if defined(CONFIG_NFS_V4_1) 8723 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 8724 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8725 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8726 .recover_open = nfs41_open_expired, 8727 .recover_lock = nfs41_lock_expired, 8728 .establish_clid = nfs41_init_clientid, 8729 }; 8730 #endif /* CONFIG_NFS_V4_1 */ 8731 8732 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 8733 .sched_state_renewal = nfs4_proc_async_renew, 8734 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 8735 .renew_lease = nfs4_proc_renew, 8736 }; 8737 8738 #if defined(CONFIG_NFS_V4_1) 8739 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 8740 .sched_state_renewal = nfs41_proc_async_sequence, 8741 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 8742 .renew_lease = nfs4_proc_sequence, 8743 }; 8744 #endif 8745 8746 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 8747 .get_locations = _nfs40_proc_get_locations, 8748 .fsid_present = _nfs40_proc_fsid_present, 8749 }; 8750 8751 #if defined(CONFIG_NFS_V4_1) 8752 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 8753 .get_locations = _nfs41_proc_get_locations, 8754 .fsid_present = _nfs41_proc_fsid_present, 8755 }; 8756 #endif /* CONFIG_NFS_V4_1 */ 8757 8758 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 8759 .minor_version = 0, 8760 .init_caps = NFS_CAP_READDIRPLUS 8761 | NFS_CAP_ATOMIC_OPEN 8762 | NFS_CAP_POSIX_LOCK, 8763 .init_client = nfs40_init_client, 8764 .shutdown_client = nfs40_shutdown_client, 8765 .match_stateid = nfs4_match_stateid, 8766 .find_root_sec = nfs4_find_root_sec, 8767 .free_lock_state = nfs4_release_lockowner, 8768 .alloc_seqid = nfs_alloc_seqid, 8769 .call_sync_ops = &nfs40_call_sync_ops, 8770 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 8771 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 8772 .state_renewal_ops = &nfs40_state_renewal_ops, 8773 .mig_recovery_ops = &nfs40_mig_recovery_ops, 8774 }; 8775 8776 #if defined(CONFIG_NFS_V4_1) 8777 static struct nfs_seqid * 8778 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 8779 { 8780 return NULL; 8781 } 8782 8783 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 8784 .minor_version = 1, 8785 .init_caps = NFS_CAP_READDIRPLUS 8786 | NFS_CAP_ATOMIC_OPEN 8787 | NFS_CAP_POSIX_LOCK 8788 | NFS_CAP_STATEID_NFSV41 8789 | NFS_CAP_ATOMIC_OPEN_V1, 8790 .init_client = nfs41_init_client, 8791 .shutdown_client = nfs41_shutdown_client, 8792 .match_stateid = nfs41_match_stateid, 8793 .find_root_sec = nfs41_find_root_sec, 8794 .free_lock_state = nfs41_free_lock_state, 8795 .alloc_seqid = nfs_alloc_no_seqid, 8796 .call_sync_ops = &nfs41_call_sync_ops, 8797 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8798 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8799 .state_renewal_ops = &nfs41_state_renewal_ops, 8800 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8801 }; 8802 #endif 8803 8804 #if defined(CONFIG_NFS_V4_2) 8805 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 8806 .minor_version = 2, 8807 .init_caps = NFS_CAP_READDIRPLUS 8808 | NFS_CAP_ATOMIC_OPEN 8809 | NFS_CAP_POSIX_LOCK 8810 | NFS_CAP_STATEID_NFSV41 8811 | NFS_CAP_ATOMIC_OPEN_V1 8812 | NFS_CAP_ALLOCATE 8813 | NFS_CAP_COPY 8814 | NFS_CAP_DEALLOCATE 8815 | NFS_CAP_SEEK 8816 | NFS_CAP_LAYOUTSTATS 8817 | NFS_CAP_CLONE, 8818 .init_client = nfs41_init_client, 8819 .shutdown_client = nfs41_shutdown_client, 8820 .match_stateid = nfs41_match_stateid, 8821 .find_root_sec = nfs41_find_root_sec, 8822 .free_lock_state = nfs41_free_lock_state, 8823 .call_sync_ops = &nfs41_call_sync_ops, 8824 .alloc_seqid = nfs_alloc_no_seqid, 8825 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8826 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8827 .state_renewal_ops = &nfs41_state_renewal_ops, 8828 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8829 }; 8830 #endif 8831 8832 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 8833 [0] = &nfs_v4_0_minor_ops, 8834 #if defined(CONFIG_NFS_V4_1) 8835 [1] = &nfs_v4_1_minor_ops, 8836 #endif 8837 #if defined(CONFIG_NFS_V4_2) 8838 [2] = &nfs_v4_2_minor_ops, 8839 #endif 8840 }; 8841 8842 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 8843 { 8844 ssize_t error, error2; 8845 8846 error = generic_listxattr(dentry, list, size); 8847 if (error < 0) 8848 return error; 8849 if (list) { 8850 list += error; 8851 size -= error; 8852 } 8853 8854 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size); 8855 if (error2 < 0) 8856 return error2; 8857 return error + error2; 8858 } 8859 8860 static const struct inode_operations nfs4_dir_inode_operations = { 8861 .create = nfs_create, 8862 .lookup = nfs_lookup, 8863 .atomic_open = nfs_atomic_open, 8864 .link = nfs_link, 8865 .unlink = nfs_unlink, 8866 .symlink = nfs_symlink, 8867 .mkdir = nfs_mkdir, 8868 .rmdir = nfs_rmdir, 8869 .mknod = nfs_mknod, 8870 .rename = nfs_rename, 8871 .permission = nfs_permission, 8872 .getattr = nfs_getattr, 8873 .setattr = nfs_setattr, 8874 .getxattr = generic_getxattr, 8875 .setxattr = generic_setxattr, 8876 .listxattr = nfs4_listxattr, 8877 .removexattr = generic_removexattr, 8878 }; 8879 8880 static const struct inode_operations nfs4_file_inode_operations = { 8881 .permission = nfs_permission, 8882 .getattr = nfs_getattr, 8883 .setattr = nfs_setattr, 8884 .getxattr = generic_getxattr, 8885 .setxattr = generic_setxattr, 8886 .listxattr = nfs4_listxattr, 8887 .removexattr = generic_removexattr, 8888 }; 8889 8890 const struct nfs_rpc_ops nfs_v4_clientops = { 8891 .version = 4, /* protocol version */ 8892 .dentry_ops = &nfs4_dentry_operations, 8893 .dir_inode_ops = &nfs4_dir_inode_operations, 8894 .file_inode_ops = &nfs4_file_inode_operations, 8895 .file_ops = &nfs4_file_operations, 8896 .getroot = nfs4_proc_get_root, 8897 .submount = nfs4_submount, 8898 .try_mount = nfs4_try_mount, 8899 .getattr = nfs4_proc_getattr, 8900 .setattr = nfs4_proc_setattr, 8901 .lookup = nfs4_proc_lookup, 8902 .access = nfs4_proc_access, 8903 .readlink = nfs4_proc_readlink, 8904 .create = nfs4_proc_create, 8905 .remove = nfs4_proc_remove, 8906 .unlink_setup = nfs4_proc_unlink_setup, 8907 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 8908 .unlink_done = nfs4_proc_unlink_done, 8909 .rename_setup = nfs4_proc_rename_setup, 8910 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 8911 .rename_done = nfs4_proc_rename_done, 8912 .link = nfs4_proc_link, 8913 .symlink = nfs4_proc_symlink, 8914 .mkdir = nfs4_proc_mkdir, 8915 .rmdir = nfs4_proc_remove, 8916 .readdir = nfs4_proc_readdir, 8917 .mknod = nfs4_proc_mknod, 8918 .statfs = nfs4_proc_statfs, 8919 .fsinfo = nfs4_proc_fsinfo, 8920 .pathconf = nfs4_proc_pathconf, 8921 .set_capabilities = nfs4_server_capabilities, 8922 .decode_dirent = nfs4_decode_dirent, 8923 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 8924 .read_setup = nfs4_proc_read_setup, 8925 .read_done = nfs4_read_done, 8926 .write_setup = nfs4_proc_write_setup, 8927 .write_done = nfs4_write_done, 8928 .commit_setup = nfs4_proc_commit_setup, 8929 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 8930 .commit_done = nfs4_commit_done, 8931 .lock = nfs4_proc_lock, 8932 .clear_acl_cache = nfs4_zap_acl_attr, 8933 .close_context = nfs4_close_context, 8934 .open_context = nfs4_atomic_open, 8935 .have_delegation = nfs4_have_delegation, 8936 .return_delegation = nfs4_inode_return_delegation, 8937 .alloc_client = nfs4_alloc_client, 8938 .init_client = nfs4_init_client, 8939 .free_client = nfs4_free_client, 8940 .create_server = nfs4_create_server, 8941 .clone_server = nfs_clone_server, 8942 }; 8943 8944 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 8945 .name = XATTR_NAME_NFSV4_ACL, 8946 .list = nfs4_xattr_list_nfs4_acl, 8947 .get = nfs4_xattr_get_nfs4_acl, 8948 .set = nfs4_xattr_set_nfs4_acl, 8949 }; 8950 8951 const struct xattr_handler *nfs4_xattr_handlers[] = { 8952 &nfs4_xattr_nfs4_acl_handler, 8953 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 8954 &nfs4_xattr_nfs4_label_handler, 8955 #endif 8956 NULL 8957 }; 8958 8959 /* 8960 * Local variables: 8961 * c-basic-offset: 8 8962 * End: 8963 */ 8964