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 struct nfs4_opendata; 78 static int _nfs4_proc_open(struct nfs4_opendata *data); 79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label); 83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label); 84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 85 struct nfs_fattr *fattr, struct iattr *sattr, 86 struct nfs4_state *state, struct nfs4_label *ilabel, 87 struct nfs4_label *olabel); 88 #ifdef CONFIG_NFS_V4_1 89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 90 struct rpc_cred *); 91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *, 92 struct rpc_cred *); 93 #endif 94 95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 96 static inline struct nfs4_label * 97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 98 struct iattr *sattr, struct nfs4_label *label) 99 { 100 int err; 101 102 if (label == NULL) 103 return NULL; 104 105 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 106 return NULL; 107 108 err = security_dentry_init_security(dentry, sattr->ia_mode, 109 &dentry->d_name, (void **)&label->label, &label->len); 110 if (err == 0) 111 return label; 112 113 return NULL; 114 } 115 static inline void 116 nfs4_label_release_security(struct nfs4_label *label) 117 { 118 if (label) 119 security_release_secctx(label->label, label->len); 120 } 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 122 { 123 if (label) 124 return server->attr_bitmask; 125 126 return server->attr_bitmask_nl; 127 } 128 #else 129 static inline struct nfs4_label * 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 131 struct iattr *sattr, struct nfs4_label *l) 132 { return NULL; } 133 static inline void 134 nfs4_label_release_security(struct nfs4_label *label) 135 { return; } 136 static inline u32 * 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 138 { return server->attr_bitmask; } 139 #endif 140 141 /* Prevent leaks of NFSv4 errors into userland */ 142 static int nfs4_map_errors(int err) 143 { 144 if (err >= -1000) 145 return err; 146 switch (err) { 147 case -NFS4ERR_RESOURCE: 148 case -NFS4ERR_LAYOUTTRYLATER: 149 case -NFS4ERR_RECALLCONFLICT: 150 return -EREMOTEIO; 151 case -NFS4ERR_WRONGSEC: 152 case -NFS4ERR_WRONG_CRED: 153 return -EPERM; 154 case -NFS4ERR_BADOWNER: 155 case -NFS4ERR_BADNAME: 156 return -EINVAL; 157 case -NFS4ERR_SHARE_DENIED: 158 return -EACCES; 159 case -NFS4ERR_MINOR_VERS_MISMATCH: 160 return -EPROTONOSUPPORT; 161 case -NFS4ERR_FILE_OPEN: 162 return -EBUSY; 163 default: 164 dprintk("%s could not handle NFSv4 error %d\n", 165 __func__, -err); 166 break; 167 } 168 return -EIO; 169 } 170 171 /* 172 * This is our standard bitmap for GETATTR requests. 173 */ 174 const u32 nfs4_fattr_bitmap[3] = { 175 FATTR4_WORD0_TYPE 176 | FATTR4_WORD0_CHANGE 177 | FATTR4_WORD0_SIZE 178 | FATTR4_WORD0_FSID 179 | FATTR4_WORD0_FILEID, 180 FATTR4_WORD1_MODE 181 | FATTR4_WORD1_NUMLINKS 182 | FATTR4_WORD1_OWNER 183 | FATTR4_WORD1_OWNER_GROUP 184 | FATTR4_WORD1_RAWDEV 185 | FATTR4_WORD1_SPACE_USED 186 | FATTR4_WORD1_TIME_ACCESS 187 | FATTR4_WORD1_TIME_METADATA 188 | FATTR4_WORD1_TIME_MODIFY 189 | FATTR4_WORD1_MOUNTED_ON_FILEID, 190 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 191 FATTR4_WORD2_SECURITY_LABEL 192 #endif 193 }; 194 195 static const u32 nfs4_pnfs_open_bitmap[3] = { 196 FATTR4_WORD0_TYPE 197 | FATTR4_WORD0_CHANGE 198 | FATTR4_WORD0_SIZE 199 | FATTR4_WORD0_FSID 200 | FATTR4_WORD0_FILEID, 201 FATTR4_WORD1_MODE 202 | FATTR4_WORD1_NUMLINKS 203 | FATTR4_WORD1_OWNER 204 | FATTR4_WORD1_OWNER_GROUP 205 | FATTR4_WORD1_RAWDEV 206 | FATTR4_WORD1_SPACE_USED 207 | FATTR4_WORD1_TIME_ACCESS 208 | FATTR4_WORD1_TIME_METADATA 209 | FATTR4_WORD1_TIME_MODIFY, 210 FATTR4_WORD2_MDSTHRESHOLD 211 }; 212 213 static const u32 nfs4_open_noattr_bitmap[3] = { 214 FATTR4_WORD0_TYPE 215 | FATTR4_WORD0_CHANGE 216 | FATTR4_WORD0_FILEID, 217 }; 218 219 const u32 nfs4_statfs_bitmap[3] = { 220 FATTR4_WORD0_FILES_AVAIL 221 | FATTR4_WORD0_FILES_FREE 222 | FATTR4_WORD0_FILES_TOTAL, 223 FATTR4_WORD1_SPACE_AVAIL 224 | FATTR4_WORD1_SPACE_FREE 225 | FATTR4_WORD1_SPACE_TOTAL 226 }; 227 228 const u32 nfs4_pathconf_bitmap[3] = { 229 FATTR4_WORD0_MAXLINK 230 | FATTR4_WORD0_MAXNAME, 231 0 232 }; 233 234 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 235 | FATTR4_WORD0_MAXREAD 236 | FATTR4_WORD0_MAXWRITE 237 | FATTR4_WORD0_LEASE_TIME, 238 FATTR4_WORD1_TIME_DELTA 239 | FATTR4_WORD1_FS_LAYOUT_TYPES, 240 FATTR4_WORD2_LAYOUT_BLKSIZE 241 | FATTR4_WORD2_CLONE_BLKSIZE 242 }; 243 244 const u32 nfs4_fs_locations_bitmap[3] = { 245 FATTR4_WORD0_TYPE 246 | FATTR4_WORD0_CHANGE 247 | FATTR4_WORD0_SIZE 248 | FATTR4_WORD0_FSID 249 | FATTR4_WORD0_FILEID 250 | FATTR4_WORD0_FS_LOCATIONS, 251 FATTR4_WORD1_MODE 252 | FATTR4_WORD1_NUMLINKS 253 | FATTR4_WORD1_OWNER 254 | FATTR4_WORD1_OWNER_GROUP 255 | FATTR4_WORD1_RAWDEV 256 | FATTR4_WORD1_SPACE_USED 257 | FATTR4_WORD1_TIME_ACCESS 258 | FATTR4_WORD1_TIME_METADATA 259 | FATTR4_WORD1_TIME_MODIFY 260 | FATTR4_WORD1_MOUNTED_ON_FILEID, 261 }; 262 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 264 struct nfs4_readdir_arg *readdir) 265 { 266 __be32 *start, *p; 267 268 if (cookie > 2) { 269 readdir->cookie = cookie; 270 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 271 return; 272 } 273 274 readdir->cookie = 0; 275 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 276 if (cookie == 2) 277 return; 278 279 /* 280 * NFSv4 servers do not return entries for '.' and '..' 281 * Therefore, we fake these entries here. We let '.' 282 * have cookie 0 and '..' have cookie 1. Note that 283 * when talking to the server, we always send cookie 0 284 * instead of 1 or 2. 285 */ 286 start = p = kmap_atomic(*readdir->pages); 287 288 if (cookie == 0) { 289 *p++ = xdr_one; /* next */ 290 *p++ = xdr_zero; /* cookie, first word */ 291 *p++ = xdr_one; /* cookie, second word */ 292 *p++ = xdr_one; /* entry len */ 293 memcpy(p, ".\0\0\0", 4); /* entry */ 294 p++; 295 *p++ = xdr_one; /* bitmap length */ 296 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 297 *p++ = htonl(8); /* attribute buffer length */ 298 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 299 } 300 301 *p++ = xdr_one; /* next */ 302 *p++ = xdr_zero; /* cookie, first word */ 303 *p++ = xdr_two; /* cookie, second word */ 304 *p++ = xdr_two; /* entry len */ 305 memcpy(p, "..\0\0", 4); /* entry */ 306 p++; 307 *p++ = xdr_one; /* bitmap length */ 308 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 309 *p++ = htonl(8); /* attribute buffer length */ 310 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 311 312 readdir->pgbase = (char *)p - (char *)start; 313 readdir->count -= readdir->pgbase; 314 kunmap_atomic(start); 315 } 316 317 static long nfs4_update_delay(long *timeout) 318 { 319 long ret; 320 if (!timeout) 321 return NFS4_POLL_RETRY_MAX; 322 if (*timeout <= 0) 323 *timeout = NFS4_POLL_RETRY_MIN; 324 if (*timeout > NFS4_POLL_RETRY_MAX) 325 *timeout = NFS4_POLL_RETRY_MAX; 326 ret = *timeout; 327 *timeout <<= 1; 328 return ret; 329 } 330 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 332 { 333 int res = 0; 334 335 might_sleep(); 336 337 freezable_schedule_timeout_killable_unsafe( 338 nfs4_update_delay(timeout)); 339 if (fatal_signal_pending(current)) 340 res = -ERESTARTSYS; 341 return res; 342 } 343 344 /* This is the error handling routine for processes that are allowed 345 * to sleep. 346 */ 347 static int nfs4_do_handle_exception(struct nfs_server *server, 348 int errorcode, struct nfs4_exception *exception) 349 { 350 struct nfs_client *clp = server->nfs_client; 351 struct nfs4_state *state = exception->state; 352 struct inode *inode = exception->inode; 353 int ret = errorcode; 354 355 exception->delay = 0; 356 exception->recovering = 0; 357 exception->retry = 0; 358 switch(errorcode) { 359 case 0: 360 return 0; 361 case -NFS4ERR_OPENMODE: 362 case -NFS4ERR_DELEG_REVOKED: 363 case -NFS4ERR_ADMIN_REVOKED: 364 case -NFS4ERR_BAD_STATEID: 365 if (inode && nfs_async_inode_return_delegation(inode, 366 NULL) == 0) 367 goto wait_on_recovery; 368 if (state == NULL) 369 break; 370 ret = nfs4_schedule_stateid_recovery(server, state); 371 if (ret < 0) 372 break; 373 goto wait_on_recovery; 374 case -NFS4ERR_EXPIRED: 375 if (state != NULL) { 376 ret = nfs4_schedule_stateid_recovery(server, state); 377 if (ret < 0) 378 break; 379 } 380 case -NFS4ERR_STALE_STATEID: 381 case -NFS4ERR_STALE_CLIENTID: 382 nfs4_schedule_lease_recovery(clp); 383 goto wait_on_recovery; 384 case -NFS4ERR_MOVED: 385 ret = nfs4_schedule_migration_recovery(server); 386 if (ret < 0) 387 break; 388 goto wait_on_recovery; 389 case -NFS4ERR_LEASE_MOVED: 390 nfs4_schedule_lease_moved_recovery(clp); 391 goto wait_on_recovery; 392 #if defined(CONFIG_NFS_V4_1) 393 case -NFS4ERR_BADSESSION: 394 case -NFS4ERR_BADSLOT: 395 case -NFS4ERR_BAD_HIGH_SLOT: 396 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 397 case -NFS4ERR_DEADSESSION: 398 case -NFS4ERR_SEQ_FALSE_RETRY: 399 case -NFS4ERR_SEQ_MISORDERED: 400 dprintk("%s ERROR: %d Reset session\n", __func__, 401 errorcode); 402 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 403 goto wait_on_recovery; 404 #endif /* defined(CONFIG_NFS_V4_1) */ 405 case -NFS4ERR_FILE_OPEN: 406 if (exception->timeout > HZ) { 407 /* We have retried a decent amount, time to 408 * fail 409 */ 410 ret = -EBUSY; 411 break; 412 } 413 case -NFS4ERR_DELAY: 414 nfs_inc_server_stats(server, NFSIOS_DELAY); 415 case -NFS4ERR_GRACE: 416 exception->delay = 1; 417 return 0; 418 419 case -NFS4ERR_RETRY_UNCACHED_REP: 420 case -NFS4ERR_OLD_STATEID: 421 exception->retry = 1; 422 break; 423 case -NFS4ERR_BADOWNER: 424 /* The following works around a Linux server bug! */ 425 case -NFS4ERR_BADNAME: 426 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 427 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 428 exception->retry = 1; 429 printk(KERN_WARNING "NFS: v4 server %s " 430 "does not accept raw " 431 "uid/gids. " 432 "Reenabling the idmapper.\n", 433 server->nfs_client->cl_hostname); 434 } 435 } 436 /* We failed to handle the error */ 437 return nfs4_map_errors(ret); 438 wait_on_recovery: 439 exception->recovering = 1; 440 return 0; 441 } 442 443 /* This is the error handling routine for processes that are allowed 444 * to sleep. 445 */ 446 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 447 { 448 struct nfs_client *clp = server->nfs_client; 449 int ret; 450 451 ret = nfs4_do_handle_exception(server, errorcode, exception); 452 if (exception->delay) { 453 ret = nfs4_delay(server->client, &exception->timeout); 454 goto out_retry; 455 } 456 if (exception->recovering) { 457 ret = nfs4_wait_clnt_recover(clp); 458 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 459 return -EIO; 460 goto out_retry; 461 } 462 return ret; 463 out_retry: 464 if (ret == 0) 465 exception->retry = 1; 466 return ret; 467 } 468 469 static int 470 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 471 int errorcode, struct nfs4_exception *exception) 472 { 473 struct nfs_client *clp = server->nfs_client; 474 int ret; 475 476 ret = nfs4_do_handle_exception(server, errorcode, exception); 477 if (exception->delay) { 478 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 479 goto out_retry; 480 } 481 if (exception->recovering) { 482 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 483 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 484 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 485 goto out_retry; 486 } 487 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 488 ret = -EIO; 489 return ret; 490 out_retry: 491 if (ret == 0) 492 exception->retry = 1; 493 return ret; 494 } 495 496 static int 497 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 498 struct nfs4_state *state, long *timeout) 499 { 500 struct nfs4_exception exception = { 501 .state = state, 502 }; 503 504 if (task->tk_status >= 0) 505 return 0; 506 if (timeout) 507 exception.timeout = *timeout; 508 task->tk_status = nfs4_async_handle_exception(task, server, 509 task->tk_status, 510 &exception); 511 if (exception.delay && timeout) 512 *timeout = exception.timeout; 513 if (exception.retry) 514 return -EAGAIN; 515 return 0; 516 } 517 518 /* 519 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 520 * or 'false' otherwise. 521 */ 522 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 523 { 524 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 525 526 if (flavor == RPC_AUTH_GSS_KRB5I || 527 flavor == RPC_AUTH_GSS_KRB5P) 528 return true; 529 530 return false; 531 } 532 533 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 534 { 535 spin_lock(&clp->cl_lock); 536 if (time_before(clp->cl_last_renewal,timestamp)) 537 clp->cl_last_renewal = timestamp; 538 spin_unlock(&clp->cl_lock); 539 } 540 541 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 542 { 543 struct nfs_client *clp = server->nfs_client; 544 545 if (!nfs4_has_session(clp)) 546 do_renew_lease(clp, timestamp); 547 } 548 549 struct nfs4_call_sync_data { 550 const struct nfs_server *seq_server; 551 struct nfs4_sequence_args *seq_args; 552 struct nfs4_sequence_res *seq_res; 553 }; 554 555 void nfs4_init_sequence(struct nfs4_sequence_args *args, 556 struct nfs4_sequence_res *res, int cache_reply) 557 { 558 args->sa_slot = NULL; 559 args->sa_cache_this = cache_reply; 560 args->sa_privileged = 0; 561 562 res->sr_slot = NULL; 563 } 564 565 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 566 { 567 args->sa_privileged = 1; 568 } 569 570 int nfs40_setup_sequence(struct nfs4_slot_table *tbl, 571 struct nfs4_sequence_args *args, 572 struct nfs4_sequence_res *res, 573 struct rpc_task *task) 574 { 575 struct nfs4_slot *slot; 576 577 /* slot already allocated? */ 578 if (res->sr_slot != NULL) 579 goto out_start; 580 581 spin_lock(&tbl->slot_tbl_lock); 582 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 583 goto out_sleep; 584 585 slot = nfs4_alloc_slot(tbl); 586 if (IS_ERR(slot)) { 587 if (slot == ERR_PTR(-ENOMEM)) 588 task->tk_timeout = HZ >> 2; 589 goto out_sleep; 590 } 591 spin_unlock(&tbl->slot_tbl_lock); 592 593 args->sa_slot = slot; 594 res->sr_slot = slot; 595 596 out_start: 597 rpc_call_start(task); 598 return 0; 599 600 out_sleep: 601 if (args->sa_privileged) 602 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 603 NULL, RPC_PRIORITY_PRIVILEGED); 604 else 605 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 606 spin_unlock(&tbl->slot_tbl_lock); 607 return -EAGAIN; 608 } 609 EXPORT_SYMBOL_GPL(nfs40_setup_sequence); 610 611 static int nfs40_sequence_done(struct rpc_task *task, 612 struct nfs4_sequence_res *res) 613 { 614 struct nfs4_slot *slot = res->sr_slot; 615 struct nfs4_slot_table *tbl; 616 617 if (slot == NULL) 618 goto out; 619 620 tbl = slot->table; 621 spin_lock(&tbl->slot_tbl_lock); 622 if (!nfs41_wake_and_assign_slot(tbl, slot)) 623 nfs4_free_slot(tbl, slot); 624 spin_unlock(&tbl->slot_tbl_lock); 625 626 res->sr_slot = NULL; 627 out: 628 return 1; 629 } 630 631 #if defined(CONFIG_NFS_V4_1) 632 633 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 634 { 635 struct nfs4_session *session; 636 struct nfs4_slot_table *tbl; 637 struct nfs4_slot *slot = res->sr_slot; 638 bool send_new_highest_used_slotid = false; 639 640 tbl = slot->table; 641 session = tbl->session; 642 643 spin_lock(&tbl->slot_tbl_lock); 644 /* Be nice to the server: try to ensure that the last transmitted 645 * value for highest_user_slotid <= target_highest_slotid 646 */ 647 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 648 send_new_highest_used_slotid = true; 649 650 if (nfs41_wake_and_assign_slot(tbl, slot)) { 651 send_new_highest_used_slotid = false; 652 goto out_unlock; 653 } 654 nfs4_free_slot(tbl, slot); 655 656 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 657 send_new_highest_used_slotid = false; 658 out_unlock: 659 spin_unlock(&tbl->slot_tbl_lock); 660 res->sr_slot = NULL; 661 if (send_new_highest_used_slotid) 662 nfs41_notify_server(session->clp); 663 } 664 665 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 666 { 667 struct nfs4_session *session; 668 struct nfs4_slot *slot = res->sr_slot; 669 struct nfs_client *clp; 670 bool interrupted = false; 671 int ret = 1; 672 673 if (slot == NULL) 674 goto out_noaction; 675 /* don't increment the sequence number if the task wasn't sent */ 676 if (!RPC_WAS_SENT(task)) 677 goto out; 678 679 session = slot->table->session; 680 681 if (slot->interrupted) { 682 slot->interrupted = 0; 683 interrupted = true; 684 } 685 686 trace_nfs4_sequence_done(session, res); 687 /* Check the SEQUENCE operation status */ 688 switch (res->sr_status) { 689 case 0: 690 /* Update the slot's sequence and clientid lease timer */ 691 ++slot->seq_nr; 692 clp = session->clp; 693 do_renew_lease(clp, res->sr_timestamp); 694 /* Check sequence flags */ 695 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 696 nfs41_update_target_slotid(slot->table, slot, res); 697 break; 698 case 1: 699 /* 700 * sr_status remains 1 if an RPC level error occurred. 701 * The server may or may not have processed the sequence 702 * operation.. 703 * Mark the slot as having hosted an interrupted RPC call. 704 */ 705 slot->interrupted = 1; 706 goto out; 707 case -NFS4ERR_DELAY: 708 /* The server detected a resend of the RPC call and 709 * returned NFS4ERR_DELAY as per Section 2.10.6.2 710 * of RFC5661. 711 */ 712 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 713 __func__, 714 slot->slot_nr, 715 slot->seq_nr); 716 goto out_retry; 717 case -NFS4ERR_BADSLOT: 718 /* 719 * The slot id we used was probably retired. Try again 720 * using a different slot id. 721 */ 722 goto retry_nowait; 723 case -NFS4ERR_SEQ_MISORDERED: 724 /* 725 * Was the last operation on this sequence interrupted? 726 * If so, retry after bumping the sequence number. 727 */ 728 if (interrupted) { 729 ++slot->seq_nr; 730 goto retry_nowait; 731 } 732 /* 733 * Could this slot have been previously retired? 734 * If so, then the server may be expecting seq_nr = 1! 735 */ 736 if (slot->seq_nr != 1) { 737 slot->seq_nr = 1; 738 goto retry_nowait; 739 } 740 break; 741 case -NFS4ERR_SEQ_FALSE_RETRY: 742 ++slot->seq_nr; 743 goto retry_nowait; 744 default: 745 /* Just update the slot sequence no. */ 746 ++slot->seq_nr; 747 } 748 out: 749 /* The session may be reset by one of the error handlers. */ 750 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 751 nfs41_sequence_free_slot(res); 752 out_noaction: 753 return ret; 754 retry_nowait: 755 if (rpc_restart_call_prepare(task)) { 756 task->tk_status = 0; 757 ret = 0; 758 } 759 goto out; 760 out_retry: 761 if (!rpc_restart_call(task)) 762 goto out; 763 rpc_delay(task, NFS4_POLL_RETRY_MAX); 764 return 0; 765 } 766 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 767 768 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 769 { 770 if (res->sr_slot == NULL) 771 return 1; 772 if (!res->sr_slot->table->session) 773 return nfs40_sequence_done(task, res); 774 return nfs41_sequence_done(task, res); 775 } 776 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 777 778 int nfs41_setup_sequence(struct nfs4_session *session, 779 struct nfs4_sequence_args *args, 780 struct nfs4_sequence_res *res, 781 struct rpc_task *task) 782 { 783 struct nfs4_slot *slot; 784 struct nfs4_slot_table *tbl; 785 786 dprintk("--> %s\n", __func__); 787 /* slot already allocated? */ 788 if (res->sr_slot != NULL) 789 goto out_success; 790 791 tbl = &session->fc_slot_table; 792 793 task->tk_timeout = 0; 794 795 spin_lock(&tbl->slot_tbl_lock); 796 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) && 797 !args->sa_privileged) { 798 /* The state manager will wait until the slot table is empty */ 799 dprintk("%s session is draining\n", __func__); 800 goto out_sleep; 801 } 802 803 slot = nfs4_alloc_slot(tbl); 804 if (IS_ERR(slot)) { 805 /* If out of memory, try again in 1/4 second */ 806 if (slot == ERR_PTR(-ENOMEM)) 807 task->tk_timeout = HZ >> 2; 808 dprintk("<-- %s: no free slots\n", __func__); 809 goto out_sleep; 810 } 811 spin_unlock(&tbl->slot_tbl_lock); 812 813 args->sa_slot = slot; 814 815 dprintk("<-- %s slotid=%u seqid=%u\n", __func__, 816 slot->slot_nr, slot->seq_nr); 817 818 res->sr_slot = slot; 819 res->sr_timestamp = jiffies; 820 res->sr_status_flags = 0; 821 /* 822 * sr_status is only set in decode_sequence, and so will remain 823 * set to 1 if an rpc level failure occurs. 824 */ 825 res->sr_status = 1; 826 trace_nfs4_setup_sequence(session, args); 827 out_success: 828 rpc_call_start(task); 829 return 0; 830 out_sleep: 831 /* Privileged tasks are queued with top priority */ 832 if (args->sa_privileged) 833 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 834 NULL, RPC_PRIORITY_PRIVILEGED); 835 else 836 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 837 spin_unlock(&tbl->slot_tbl_lock); 838 return -EAGAIN; 839 } 840 EXPORT_SYMBOL_GPL(nfs41_setup_sequence); 841 842 static int nfs4_setup_sequence(const struct nfs_server *server, 843 struct nfs4_sequence_args *args, 844 struct nfs4_sequence_res *res, 845 struct rpc_task *task) 846 { 847 struct nfs4_session *session = nfs4_get_session(server); 848 int ret = 0; 849 850 if (!session) 851 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl, 852 args, res, task); 853 854 dprintk("--> %s clp %p session %p sr_slot %u\n", 855 __func__, session->clp, session, res->sr_slot ? 856 res->sr_slot->slot_nr : NFS4_NO_SLOT); 857 858 ret = nfs41_setup_sequence(session, args, res, task); 859 860 dprintk("<-- %s status=%d\n", __func__, ret); 861 return ret; 862 } 863 864 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 865 { 866 struct nfs4_call_sync_data *data = calldata; 867 struct nfs4_session *session = nfs4_get_session(data->seq_server); 868 869 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 870 871 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task); 872 } 873 874 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 875 { 876 struct nfs4_call_sync_data *data = calldata; 877 878 nfs41_sequence_done(task, data->seq_res); 879 } 880 881 static const struct rpc_call_ops nfs41_call_sync_ops = { 882 .rpc_call_prepare = nfs41_call_sync_prepare, 883 .rpc_call_done = nfs41_call_sync_done, 884 }; 885 886 #else /* !CONFIG_NFS_V4_1 */ 887 888 static int nfs4_setup_sequence(const struct nfs_server *server, 889 struct nfs4_sequence_args *args, 890 struct nfs4_sequence_res *res, 891 struct rpc_task *task) 892 { 893 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl, 894 args, res, task); 895 } 896 897 int nfs4_sequence_done(struct rpc_task *task, 898 struct nfs4_sequence_res *res) 899 { 900 return nfs40_sequence_done(task, res); 901 } 902 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 903 904 #endif /* !CONFIG_NFS_V4_1 */ 905 906 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 907 { 908 struct nfs4_call_sync_data *data = calldata; 909 nfs4_setup_sequence(data->seq_server, 910 data->seq_args, data->seq_res, task); 911 } 912 913 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 914 { 915 struct nfs4_call_sync_data *data = calldata; 916 nfs4_sequence_done(task, data->seq_res); 917 } 918 919 static const struct rpc_call_ops nfs40_call_sync_ops = { 920 .rpc_call_prepare = nfs40_call_sync_prepare, 921 .rpc_call_done = nfs40_call_sync_done, 922 }; 923 924 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 925 struct nfs_server *server, 926 struct rpc_message *msg, 927 struct nfs4_sequence_args *args, 928 struct nfs4_sequence_res *res) 929 { 930 int ret; 931 struct rpc_task *task; 932 struct nfs_client *clp = server->nfs_client; 933 struct nfs4_call_sync_data data = { 934 .seq_server = server, 935 .seq_args = args, 936 .seq_res = res, 937 }; 938 struct rpc_task_setup task_setup = { 939 .rpc_client = clnt, 940 .rpc_message = msg, 941 .callback_ops = clp->cl_mvops->call_sync_ops, 942 .callback_data = &data 943 }; 944 945 task = rpc_run_task(&task_setup); 946 if (IS_ERR(task)) 947 ret = PTR_ERR(task); 948 else { 949 ret = task->tk_status; 950 rpc_put_task(task); 951 } 952 return ret; 953 } 954 955 int nfs4_call_sync(struct rpc_clnt *clnt, 956 struct nfs_server *server, 957 struct rpc_message *msg, 958 struct nfs4_sequence_args *args, 959 struct nfs4_sequence_res *res, 960 int cache_reply) 961 { 962 nfs4_init_sequence(args, res, cache_reply); 963 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 964 } 965 966 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 967 { 968 struct nfs_inode *nfsi = NFS_I(dir); 969 970 spin_lock(&dir->i_lock); 971 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 972 if (!cinfo->atomic || cinfo->before != dir->i_version) 973 nfs_force_lookup_revalidate(dir); 974 dir->i_version = cinfo->after; 975 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 976 nfs_fscache_invalidate(dir); 977 spin_unlock(&dir->i_lock); 978 } 979 980 struct nfs4_opendata { 981 struct kref kref; 982 struct nfs_openargs o_arg; 983 struct nfs_openres o_res; 984 struct nfs_open_confirmargs c_arg; 985 struct nfs_open_confirmres c_res; 986 struct nfs4_string owner_name; 987 struct nfs4_string group_name; 988 struct nfs4_label *a_label; 989 struct nfs_fattr f_attr; 990 struct nfs4_label *f_label; 991 struct dentry *dir; 992 struct dentry *dentry; 993 struct nfs4_state_owner *owner; 994 struct nfs4_state *state; 995 struct iattr attrs; 996 unsigned long timestamp; 997 unsigned int rpc_done : 1; 998 unsigned int file_created : 1; 999 unsigned int is_recover : 1; 1000 int rpc_status; 1001 int cancelled; 1002 }; 1003 1004 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1005 int err, struct nfs4_exception *exception) 1006 { 1007 if (err != -EINVAL) 1008 return false; 1009 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1010 return false; 1011 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1012 exception->retry = 1; 1013 return true; 1014 } 1015 1016 static u32 1017 nfs4_map_atomic_open_share(struct nfs_server *server, 1018 fmode_t fmode, int openflags) 1019 { 1020 u32 res = 0; 1021 1022 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1023 case FMODE_READ: 1024 res = NFS4_SHARE_ACCESS_READ; 1025 break; 1026 case FMODE_WRITE: 1027 res = NFS4_SHARE_ACCESS_WRITE; 1028 break; 1029 case FMODE_READ|FMODE_WRITE: 1030 res = NFS4_SHARE_ACCESS_BOTH; 1031 } 1032 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1033 goto out; 1034 /* Want no delegation if we're using O_DIRECT */ 1035 if (openflags & O_DIRECT) 1036 res |= NFS4_SHARE_WANT_NO_DELEG; 1037 out: 1038 return res; 1039 } 1040 1041 static enum open_claim_type4 1042 nfs4_map_atomic_open_claim(struct nfs_server *server, 1043 enum open_claim_type4 claim) 1044 { 1045 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1046 return claim; 1047 switch (claim) { 1048 default: 1049 return claim; 1050 case NFS4_OPEN_CLAIM_FH: 1051 return NFS4_OPEN_CLAIM_NULL; 1052 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1053 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1054 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1055 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1056 } 1057 } 1058 1059 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1060 { 1061 p->o_res.f_attr = &p->f_attr; 1062 p->o_res.f_label = p->f_label; 1063 p->o_res.seqid = p->o_arg.seqid; 1064 p->c_res.seqid = p->c_arg.seqid; 1065 p->o_res.server = p->o_arg.server; 1066 p->o_res.access_request = p->o_arg.access; 1067 nfs_fattr_init(&p->f_attr); 1068 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1069 } 1070 1071 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1072 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1073 const struct iattr *attrs, 1074 struct nfs4_label *label, 1075 enum open_claim_type4 claim, 1076 gfp_t gfp_mask) 1077 { 1078 struct dentry *parent = dget_parent(dentry); 1079 struct inode *dir = d_inode(parent); 1080 struct nfs_server *server = NFS_SERVER(dir); 1081 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1082 struct nfs4_opendata *p; 1083 1084 p = kzalloc(sizeof(*p), gfp_mask); 1085 if (p == NULL) 1086 goto err; 1087 1088 p->f_label = nfs4_label_alloc(server, gfp_mask); 1089 if (IS_ERR(p->f_label)) 1090 goto err_free_p; 1091 1092 p->a_label = nfs4_label_alloc(server, gfp_mask); 1093 if (IS_ERR(p->a_label)) 1094 goto err_free_f; 1095 1096 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1097 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1098 if (IS_ERR(p->o_arg.seqid)) 1099 goto err_free_label; 1100 nfs_sb_active(dentry->d_sb); 1101 p->dentry = dget(dentry); 1102 p->dir = parent; 1103 p->owner = sp; 1104 atomic_inc(&sp->so_count); 1105 p->o_arg.open_flags = flags; 1106 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1107 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1108 fmode, flags); 1109 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1110 * will return permission denied for all bits until close */ 1111 if (!(flags & O_EXCL)) { 1112 /* ask server to check for all possible rights as results 1113 * are cached */ 1114 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1115 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE; 1116 } 1117 p->o_arg.clientid = server->nfs_client->cl_clientid; 1118 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1119 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1120 p->o_arg.name = &dentry->d_name; 1121 p->o_arg.server = server; 1122 p->o_arg.bitmask = nfs4_bitmask(server, label); 1123 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1124 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1125 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1126 switch (p->o_arg.claim) { 1127 case NFS4_OPEN_CLAIM_NULL: 1128 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1129 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1130 p->o_arg.fh = NFS_FH(dir); 1131 break; 1132 case NFS4_OPEN_CLAIM_PREVIOUS: 1133 case NFS4_OPEN_CLAIM_FH: 1134 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1135 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1136 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1137 } 1138 if (attrs != NULL && attrs->ia_valid != 0) { 1139 __u32 verf[2]; 1140 1141 p->o_arg.u.attrs = &p->attrs; 1142 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 1143 1144 verf[0] = jiffies; 1145 verf[1] = current->pid; 1146 memcpy(p->o_arg.u.verifier.data, verf, 1147 sizeof(p->o_arg.u.verifier.data)); 1148 } 1149 p->c_arg.fh = &p->o_res.fh; 1150 p->c_arg.stateid = &p->o_res.stateid; 1151 p->c_arg.seqid = p->o_arg.seqid; 1152 nfs4_init_opendata_res(p); 1153 kref_init(&p->kref); 1154 return p; 1155 1156 err_free_label: 1157 nfs4_label_free(p->a_label); 1158 err_free_f: 1159 nfs4_label_free(p->f_label); 1160 err_free_p: 1161 kfree(p); 1162 err: 1163 dput(parent); 1164 return NULL; 1165 } 1166 1167 static void nfs4_opendata_free(struct kref *kref) 1168 { 1169 struct nfs4_opendata *p = container_of(kref, 1170 struct nfs4_opendata, kref); 1171 struct super_block *sb = p->dentry->d_sb; 1172 1173 nfs_free_seqid(p->o_arg.seqid); 1174 if (p->state != NULL) 1175 nfs4_put_open_state(p->state); 1176 nfs4_put_state_owner(p->owner); 1177 1178 nfs4_label_free(p->a_label); 1179 nfs4_label_free(p->f_label); 1180 1181 dput(p->dir); 1182 dput(p->dentry); 1183 nfs_sb_deactive(sb); 1184 nfs_fattr_free_names(&p->f_attr); 1185 kfree(p->f_attr.mdsthreshold); 1186 kfree(p); 1187 } 1188 1189 static void nfs4_opendata_put(struct nfs4_opendata *p) 1190 { 1191 if (p != NULL) 1192 kref_put(&p->kref, nfs4_opendata_free); 1193 } 1194 1195 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 1196 { 1197 int ret; 1198 1199 ret = rpc_wait_for_completion_task(task); 1200 return ret; 1201 } 1202 1203 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1204 fmode_t fmode) 1205 { 1206 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1207 case FMODE_READ|FMODE_WRITE: 1208 return state->n_rdwr != 0; 1209 case FMODE_WRITE: 1210 return state->n_wronly != 0; 1211 case FMODE_READ: 1212 return state->n_rdonly != 0; 1213 } 1214 WARN_ON_ONCE(1); 1215 return false; 1216 } 1217 1218 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1219 { 1220 int ret = 0; 1221 1222 if (open_mode & (O_EXCL|O_TRUNC)) 1223 goto out; 1224 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1225 case FMODE_READ: 1226 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1227 && state->n_rdonly != 0; 1228 break; 1229 case FMODE_WRITE: 1230 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1231 && state->n_wronly != 0; 1232 break; 1233 case FMODE_READ|FMODE_WRITE: 1234 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1235 && state->n_rdwr != 0; 1236 } 1237 out: 1238 return ret; 1239 } 1240 1241 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1242 enum open_claim_type4 claim) 1243 { 1244 if (delegation == NULL) 1245 return 0; 1246 if ((delegation->type & fmode) != fmode) 1247 return 0; 1248 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1249 return 0; 1250 switch (claim) { 1251 case NFS4_OPEN_CLAIM_NULL: 1252 case NFS4_OPEN_CLAIM_FH: 1253 break; 1254 case NFS4_OPEN_CLAIM_PREVIOUS: 1255 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1256 break; 1257 default: 1258 return 0; 1259 } 1260 nfs_mark_delegation_referenced(delegation); 1261 return 1; 1262 } 1263 1264 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1265 { 1266 switch (fmode) { 1267 case FMODE_WRITE: 1268 state->n_wronly++; 1269 break; 1270 case FMODE_READ: 1271 state->n_rdonly++; 1272 break; 1273 case FMODE_READ|FMODE_WRITE: 1274 state->n_rdwr++; 1275 } 1276 nfs4_state_set_mode_locked(state, state->state | fmode); 1277 } 1278 1279 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1280 { 1281 struct nfs_client *clp = state->owner->so_server->nfs_client; 1282 bool need_recover = false; 1283 1284 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1285 need_recover = true; 1286 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1287 need_recover = true; 1288 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1289 need_recover = true; 1290 if (need_recover) 1291 nfs4_state_mark_reclaim_nograce(clp, state); 1292 } 1293 1294 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1295 nfs4_stateid *stateid) 1296 { 1297 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0) 1298 return true; 1299 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1300 nfs_test_and_clear_all_open_stateid(state); 1301 return true; 1302 } 1303 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) 1304 return true; 1305 return false; 1306 } 1307 1308 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1309 { 1310 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1311 return; 1312 if (state->n_wronly) 1313 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1314 if (state->n_rdonly) 1315 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1316 if (state->n_rdwr) 1317 set_bit(NFS_O_RDWR_STATE, &state->flags); 1318 set_bit(NFS_OPEN_STATE, &state->flags); 1319 } 1320 1321 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1322 nfs4_stateid *arg_stateid, 1323 nfs4_stateid *stateid, fmode_t fmode) 1324 { 1325 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1326 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1327 case FMODE_WRITE: 1328 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1329 break; 1330 case FMODE_READ: 1331 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1332 break; 1333 case 0: 1334 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1335 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1336 clear_bit(NFS_OPEN_STATE, &state->flags); 1337 } 1338 if (stateid == NULL) 1339 return; 1340 /* Handle races with OPEN */ 1341 if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) || 1342 (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1343 !nfs4_stateid_is_newer(stateid, &state->open_stateid))) { 1344 nfs_resync_open_stateid_locked(state); 1345 return; 1346 } 1347 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1348 nfs4_stateid_copy(&state->stateid, stateid); 1349 nfs4_stateid_copy(&state->open_stateid, stateid); 1350 } 1351 1352 static void nfs_clear_open_stateid(struct nfs4_state *state, 1353 nfs4_stateid *arg_stateid, 1354 nfs4_stateid *stateid, fmode_t fmode) 1355 { 1356 write_seqlock(&state->seqlock); 1357 nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode); 1358 write_sequnlock(&state->seqlock); 1359 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1360 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1361 } 1362 1363 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 1364 { 1365 switch (fmode) { 1366 case FMODE_READ: 1367 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1368 break; 1369 case FMODE_WRITE: 1370 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1371 break; 1372 case FMODE_READ|FMODE_WRITE: 1373 set_bit(NFS_O_RDWR_STATE, &state->flags); 1374 } 1375 if (!nfs_need_update_open_stateid(state, stateid)) 1376 return; 1377 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1378 nfs4_stateid_copy(&state->stateid, stateid); 1379 nfs4_stateid_copy(&state->open_stateid, stateid); 1380 } 1381 1382 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode) 1383 { 1384 /* 1385 * Protect the call to nfs4_state_set_mode_locked and 1386 * serialise the stateid update 1387 */ 1388 write_seqlock(&state->seqlock); 1389 if (deleg_stateid != NULL) { 1390 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1391 set_bit(NFS_DELEGATED_STATE, &state->flags); 1392 } 1393 if (open_stateid != NULL) 1394 nfs_set_open_stateid_locked(state, open_stateid, fmode); 1395 write_sequnlock(&state->seqlock); 1396 spin_lock(&state->owner->so_lock); 1397 update_open_stateflags(state, fmode); 1398 spin_unlock(&state->owner->so_lock); 1399 } 1400 1401 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode) 1402 { 1403 struct nfs_inode *nfsi = NFS_I(state->inode); 1404 struct nfs_delegation *deleg_cur; 1405 int ret = 0; 1406 1407 fmode &= (FMODE_READ|FMODE_WRITE); 1408 1409 rcu_read_lock(); 1410 deleg_cur = rcu_dereference(nfsi->delegation); 1411 if (deleg_cur == NULL) 1412 goto no_delegation; 1413 1414 spin_lock(&deleg_cur->lock); 1415 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1416 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1417 (deleg_cur->type & fmode) != fmode) 1418 goto no_delegation_unlock; 1419 1420 if (delegation == NULL) 1421 delegation = &deleg_cur->stateid; 1422 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1423 goto no_delegation_unlock; 1424 1425 nfs_mark_delegation_referenced(deleg_cur); 1426 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode); 1427 ret = 1; 1428 no_delegation_unlock: 1429 spin_unlock(&deleg_cur->lock); 1430 no_delegation: 1431 rcu_read_unlock(); 1432 1433 if (!ret && open_stateid != NULL) { 1434 __update_open_stateid(state, open_stateid, NULL, fmode); 1435 ret = 1; 1436 } 1437 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1438 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1439 1440 return ret; 1441 } 1442 1443 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1444 const nfs4_stateid *stateid) 1445 { 1446 struct nfs4_state *state = lsp->ls_state; 1447 bool ret = false; 1448 1449 spin_lock(&state->state_lock); 1450 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1451 goto out_noupdate; 1452 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1453 goto out_noupdate; 1454 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1455 ret = true; 1456 out_noupdate: 1457 spin_unlock(&state->state_lock); 1458 return ret; 1459 } 1460 1461 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1462 { 1463 struct nfs_delegation *delegation; 1464 1465 rcu_read_lock(); 1466 delegation = rcu_dereference(NFS_I(inode)->delegation); 1467 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1468 rcu_read_unlock(); 1469 return; 1470 } 1471 rcu_read_unlock(); 1472 nfs4_inode_return_delegation(inode); 1473 } 1474 1475 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1476 { 1477 struct nfs4_state *state = opendata->state; 1478 struct nfs_inode *nfsi = NFS_I(state->inode); 1479 struct nfs_delegation *delegation; 1480 int open_mode = opendata->o_arg.open_flags; 1481 fmode_t fmode = opendata->o_arg.fmode; 1482 enum open_claim_type4 claim = opendata->o_arg.claim; 1483 nfs4_stateid stateid; 1484 int ret = -EAGAIN; 1485 1486 for (;;) { 1487 spin_lock(&state->owner->so_lock); 1488 if (can_open_cached(state, fmode, open_mode)) { 1489 update_open_stateflags(state, fmode); 1490 spin_unlock(&state->owner->so_lock); 1491 goto out_return_state; 1492 } 1493 spin_unlock(&state->owner->so_lock); 1494 rcu_read_lock(); 1495 delegation = rcu_dereference(nfsi->delegation); 1496 if (!can_open_delegated(delegation, fmode, claim)) { 1497 rcu_read_unlock(); 1498 break; 1499 } 1500 /* Save the delegation */ 1501 nfs4_stateid_copy(&stateid, &delegation->stateid); 1502 rcu_read_unlock(); 1503 nfs_release_seqid(opendata->o_arg.seqid); 1504 if (!opendata->is_recover) { 1505 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1506 if (ret != 0) 1507 goto out; 1508 } 1509 ret = -EAGAIN; 1510 1511 /* Try to update the stateid using the delegation */ 1512 if (update_open_stateid(state, NULL, &stateid, fmode)) 1513 goto out_return_state; 1514 } 1515 out: 1516 return ERR_PTR(ret); 1517 out_return_state: 1518 atomic_inc(&state->count); 1519 return state; 1520 } 1521 1522 static void 1523 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1524 { 1525 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1526 struct nfs_delegation *delegation; 1527 int delegation_flags = 0; 1528 1529 rcu_read_lock(); 1530 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1531 if (delegation) 1532 delegation_flags = delegation->flags; 1533 rcu_read_unlock(); 1534 switch (data->o_arg.claim) { 1535 default: 1536 break; 1537 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1538 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1539 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1540 "returning a delegation for " 1541 "OPEN(CLAIM_DELEGATE_CUR)\n", 1542 clp->cl_hostname); 1543 return; 1544 } 1545 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1546 nfs_inode_set_delegation(state->inode, 1547 data->owner->so_cred, 1548 &data->o_res); 1549 else 1550 nfs_inode_reclaim_delegation(state->inode, 1551 data->owner->so_cred, 1552 &data->o_res); 1553 } 1554 1555 /* 1556 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1557 * and update the nfs4_state. 1558 */ 1559 static struct nfs4_state * 1560 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1561 { 1562 struct inode *inode = data->state->inode; 1563 struct nfs4_state *state = data->state; 1564 int ret; 1565 1566 if (!data->rpc_done) { 1567 if (data->rpc_status) { 1568 ret = data->rpc_status; 1569 goto err; 1570 } 1571 /* cached opens have already been processed */ 1572 goto update; 1573 } 1574 1575 ret = nfs_refresh_inode(inode, &data->f_attr); 1576 if (ret) 1577 goto err; 1578 1579 if (data->o_res.delegation_type != 0) 1580 nfs4_opendata_check_deleg(data, state); 1581 update: 1582 update_open_stateid(state, &data->o_res.stateid, NULL, 1583 data->o_arg.fmode); 1584 atomic_inc(&state->count); 1585 1586 return state; 1587 err: 1588 return ERR_PTR(ret); 1589 1590 } 1591 1592 static struct nfs4_state * 1593 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1594 { 1595 struct inode *inode; 1596 struct nfs4_state *state = NULL; 1597 int ret; 1598 1599 if (!data->rpc_done) { 1600 state = nfs4_try_open_cached(data); 1601 goto out; 1602 } 1603 1604 ret = -EAGAIN; 1605 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1606 goto err; 1607 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label); 1608 ret = PTR_ERR(inode); 1609 if (IS_ERR(inode)) 1610 goto err; 1611 ret = -ENOMEM; 1612 state = nfs4_get_open_state(inode, data->owner); 1613 if (state == NULL) 1614 goto err_put_inode; 1615 if (data->o_res.delegation_type != 0) 1616 nfs4_opendata_check_deleg(data, state); 1617 update_open_stateid(state, &data->o_res.stateid, NULL, 1618 data->o_arg.fmode); 1619 iput(inode); 1620 out: 1621 nfs_release_seqid(data->o_arg.seqid); 1622 return state; 1623 err_put_inode: 1624 iput(inode); 1625 err: 1626 return ERR_PTR(ret); 1627 } 1628 1629 static struct nfs4_state * 1630 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1631 { 1632 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1633 return _nfs4_opendata_reclaim_to_nfs4_state(data); 1634 return _nfs4_opendata_to_nfs4_state(data); 1635 } 1636 1637 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1638 { 1639 struct nfs_inode *nfsi = NFS_I(state->inode); 1640 struct nfs_open_context *ctx; 1641 1642 spin_lock(&state->inode->i_lock); 1643 list_for_each_entry(ctx, &nfsi->open_files, list) { 1644 if (ctx->state != state) 1645 continue; 1646 get_nfs_open_context(ctx); 1647 spin_unlock(&state->inode->i_lock); 1648 return ctx; 1649 } 1650 spin_unlock(&state->inode->i_lock); 1651 return ERR_PTR(-ENOENT); 1652 } 1653 1654 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1655 struct nfs4_state *state, enum open_claim_type4 claim) 1656 { 1657 struct nfs4_opendata *opendata; 1658 1659 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1660 NULL, NULL, claim, GFP_NOFS); 1661 if (opendata == NULL) 1662 return ERR_PTR(-ENOMEM); 1663 opendata->state = state; 1664 atomic_inc(&state->count); 1665 return opendata; 1666 } 1667 1668 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 1669 fmode_t fmode) 1670 { 1671 struct nfs4_state *newstate; 1672 int ret; 1673 1674 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 1675 return 0; 1676 opendata->o_arg.open_flags = 0; 1677 opendata->o_arg.fmode = fmode; 1678 opendata->o_arg.share_access = nfs4_map_atomic_open_share( 1679 NFS_SB(opendata->dentry->d_sb), 1680 fmode, 0); 1681 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1682 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1683 nfs4_init_opendata_res(opendata); 1684 ret = _nfs4_recover_proc_open(opendata); 1685 if (ret != 0) 1686 return ret; 1687 newstate = nfs4_opendata_to_nfs4_state(opendata); 1688 if (IS_ERR(newstate)) 1689 return PTR_ERR(newstate); 1690 if (newstate != opendata->state) 1691 ret = -ESTALE; 1692 nfs4_close_state(newstate, fmode); 1693 return ret; 1694 } 1695 1696 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1697 { 1698 int ret; 1699 1700 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1701 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1702 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1703 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1704 /* memory barrier prior to reading state->n_* */ 1705 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1706 clear_bit(NFS_OPEN_STATE, &state->flags); 1707 smp_rmb(); 1708 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1709 if (ret != 0) 1710 return ret; 1711 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1712 if (ret != 0) 1713 return ret; 1714 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 1715 if (ret != 0) 1716 return ret; 1717 /* 1718 * We may have performed cached opens for all three recoveries. 1719 * Check if we need to update the current stateid. 1720 */ 1721 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1722 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1723 write_seqlock(&state->seqlock); 1724 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1725 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1726 write_sequnlock(&state->seqlock); 1727 } 1728 return 0; 1729 } 1730 1731 /* 1732 * OPEN_RECLAIM: 1733 * reclaim state on the server after a reboot. 1734 */ 1735 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1736 { 1737 struct nfs_delegation *delegation; 1738 struct nfs4_opendata *opendata; 1739 fmode_t delegation_type = 0; 1740 int status; 1741 1742 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1743 NFS4_OPEN_CLAIM_PREVIOUS); 1744 if (IS_ERR(opendata)) 1745 return PTR_ERR(opendata); 1746 rcu_read_lock(); 1747 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1748 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1749 delegation_type = delegation->type; 1750 rcu_read_unlock(); 1751 opendata->o_arg.u.delegation_type = delegation_type; 1752 status = nfs4_open_recover(opendata, state); 1753 nfs4_opendata_put(opendata); 1754 return status; 1755 } 1756 1757 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1758 { 1759 struct nfs_server *server = NFS_SERVER(state->inode); 1760 struct nfs4_exception exception = { }; 1761 int err; 1762 do { 1763 err = _nfs4_do_open_reclaim(ctx, state); 1764 trace_nfs4_open_reclaim(ctx, 0, err); 1765 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 1766 continue; 1767 if (err != -NFS4ERR_DELAY) 1768 break; 1769 nfs4_handle_exception(server, err, &exception); 1770 } while (exception.retry); 1771 return err; 1772 } 1773 1774 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 1775 { 1776 struct nfs_open_context *ctx; 1777 int ret; 1778 1779 ctx = nfs4_state_find_open_context(state); 1780 if (IS_ERR(ctx)) 1781 return -EAGAIN; 1782 ret = nfs4_do_open_reclaim(ctx, state); 1783 put_nfs_open_context(ctx); 1784 return ret; 1785 } 1786 1787 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err) 1788 { 1789 switch (err) { 1790 default: 1791 printk(KERN_ERR "NFS: %s: unhandled error " 1792 "%d.\n", __func__, err); 1793 case 0: 1794 case -ENOENT: 1795 case -EAGAIN: 1796 case -ESTALE: 1797 break; 1798 case -NFS4ERR_BADSESSION: 1799 case -NFS4ERR_BADSLOT: 1800 case -NFS4ERR_BAD_HIGH_SLOT: 1801 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1802 case -NFS4ERR_DEADSESSION: 1803 set_bit(NFS_DELEGATED_STATE, &state->flags); 1804 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 1805 return -EAGAIN; 1806 case -NFS4ERR_STALE_CLIENTID: 1807 case -NFS4ERR_STALE_STATEID: 1808 set_bit(NFS_DELEGATED_STATE, &state->flags); 1809 case -NFS4ERR_EXPIRED: 1810 /* Don't recall a delegation if it was lost */ 1811 nfs4_schedule_lease_recovery(server->nfs_client); 1812 return -EAGAIN; 1813 case -NFS4ERR_MOVED: 1814 nfs4_schedule_migration_recovery(server); 1815 return -EAGAIN; 1816 case -NFS4ERR_LEASE_MOVED: 1817 nfs4_schedule_lease_moved_recovery(server->nfs_client); 1818 return -EAGAIN; 1819 case -NFS4ERR_DELEG_REVOKED: 1820 case -NFS4ERR_ADMIN_REVOKED: 1821 case -NFS4ERR_BAD_STATEID: 1822 case -NFS4ERR_OPENMODE: 1823 nfs_inode_find_state_and_recover(state->inode, 1824 stateid); 1825 nfs4_schedule_stateid_recovery(server, state); 1826 return -EAGAIN; 1827 case -NFS4ERR_DELAY: 1828 case -NFS4ERR_GRACE: 1829 set_bit(NFS_DELEGATED_STATE, &state->flags); 1830 ssleep(1); 1831 return -EAGAIN; 1832 case -ENOMEM: 1833 case -NFS4ERR_DENIED: 1834 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 1835 return 0; 1836 } 1837 return err; 1838 } 1839 1840 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 1841 struct nfs4_state *state, const nfs4_stateid *stateid, 1842 fmode_t type) 1843 { 1844 struct nfs_server *server = NFS_SERVER(state->inode); 1845 struct nfs4_opendata *opendata; 1846 int err = 0; 1847 1848 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1849 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 1850 if (IS_ERR(opendata)) 1851 return PTR_ERR(opendata); 1852 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 1853 write_seqlock(&state->seqlock); 1854 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1855 write_sequnlock(&state->seqlock); 1856 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1857 switch (type & (FMODE_READ|FMODE_WRITE)) { 1858 case FMODE_READ|FMODE_WRITE: 1859 case FMODE_WRITE: 1860 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 1861 if (err) 1862 break; 1863 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 1864 if (err) 1865 break; 1866 case FMODE_READ: 1867 err = nfs4_open_recover_helper(opendata, FMODE_READ); 1868 } 1869 nfs4_opendata_put(opendata); 1870 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 1871 } 1872 1873 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 1874 { 1875 struct nfs4_opendata *data = calldata; 1876 1877 nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl, 1878 &data->c_arg.seq_args, &data->c_res.seq_res, task); 1879 } 1880 1881 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 1882 { 1883 struct nfs4_opendata *data = calldata; 1884 1885 nfs40_sequence_done(task, &data->c_res.seq_res); 1886 1887 data->rpc_status = task->tk_status; 1888 if (data->rpc_status == 0) { 1889 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 1890 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1891 renew_lease(data->o_res.server, data->timestamp); 1892 data->rpc_done = 1; 1893 } 1894 } 1895 1896 static void nfs4_open_confirm_release(void *calldata) 1897 { 1898 struct nfs4_opendata *data = calldata; 1899 struct nfs4_state *state = NULL; 1900 1901 /* If this request hasn't been cancelled, do nothing */ 1902 if (data->cancelled == 0) 1903 goto out_free; 1904 /* In case of error, no cleanup! */ 1905 if (!data->rpc_done) 1906 goto out_free; 1907 state = nfs4_opendata_to_nfs4_state(data); 1908 if (!IS_ERR(state)) 1909 nfs4_close_state(state, data->o_arg.fmode); 1910 out_free: 1911 nfs4_opendata_put(data); 1912 } 1913 1914 static const struct rpc_call_ops nfs4_open_confirm_ops = { 1915 .rpc_call_prepare = nfs4_open_confirm_prepare, 1916 .rpc_call_done = nfs4_open_confirm_done, 1917 .rpc_release = nfs4_open_confirm_release, 1918 }; 1919 1920 /* 1921 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 1922 */ 1923 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 1924 { 1925 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 1926 struct rpc_task *task; 1927 struct rpc_message msg = { 1928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 1929 .rpc_argp = &data->c_arg, 1930 .rpc_resp = &data->c_res, 1931 .rpc_cred = data->owner->so_cred, 1932 }; 1933 struct rpc_task_setup task_setup_data = { 1934 .rpc_client = server->client, 1935 .rpc_message = &msg, 1936 .callback_ops = &nfs4_open_confirm_ops, 1937 .callback_data = data, 1938 .workqueue = nfsiod_workqueue, 1939 .flags = RPC_TASK_ASYNC, 1940 }; 1941 int status; 1942 1943 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); 1944 kref_get(&data->kref); 1945 data->rpc_done = 0; 1946 data->rpc_status = 0; 1947 data->timestamp = jiffies; 1948 if (data->is_recover) 1949 nfs4_set_sequence_privileged(&data->c_arg.seq_args); 1950 task = rpc_run_task(&task_setup_data); 1951 if (IS_ERR(task)) 1952 return PTR_ERR(task); 1953 status = nfs4_wait_for_completion_rpc_task(task); 1954 if (status != 0) { 1955 data->cancelled = 1; 1956 smp_wmb(); 1957 } else 1958 status = data->rpc_status; 1959 rpc_put_task(task); 1960 return status; 1961 } 1962 1963 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 1964 { 1965 struct nfs4_opendata *data = calldata; 1966 struct nfs4_state_owner *sp = data->owner; 1967 struct nfs_client *clp = sp->so_server->nfs_client; 1968 enum open_claim_type4 claim = data->o_arg.claim; 1969 1970 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 1971 goto out_wait; 1972 /* 1973 * Check if we still need to send an OPEN call, or if we can use 1974 * a delegation instead. 1975 */ 1976 if (data->state != NULL) { 1977 struct nfs_delegation *delegation; 1978 1979 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 1980 goto out_no_action; 1981 rcu_read_lock(); 1982 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 1983 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 1984 goto unlock_no_action; 1985 rcu_read_unlock(); 1986 } 1987 /* Update client id. */ 1988 data->o_arg.clientid = clp->cl_clientid; 1989 switch (claim) { 1990 default: 1991 break; 1992 case NFS4_OPEN_CLAIM_PREVIOUS: 1993 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1994 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1995 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 1996 case NFS4_OPEN_CLAIM_FH: 1997 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 1998 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 1999 } 2000 data->timestamp = jiffies; 2001 if (nfs4_setup_sequence(data->o_arg.server, 2002 &data->o_arg.seq_args, 2003 &data->o_res.seq_res, 2004 task) != 0) 2005 nfs_release_seqid(data->o_arg.seqid); 2006 2007 /* Set the create mode (note dependency on the session type) */ 2008 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2009 if (data->o_arg.open_flags & O_EXCL) { 2010 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2011 if (nfs4_has_persistent_session(clp)) 2012 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2013 else if (clp->cl_mvops->minor_version > 0) 2014 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2015 } 2016 return; 2017 unlock_no_action: 2018 rcu_read_unlock(); 2019 out_no_action: 2020 task->tk_action = NULL; 2021 out_wait: 2022 nfs4_sequence_done(task, &data->o_res.seq_res); 2023 } 2024 2025 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2026 { 2027 struct nfs4_opendata *data = calldata; 2028 2029 data->rpc_status = task->tk_status; 2030 2031 if (!nfs4_sequence_done(task, &data->o_res.seq_res)) 2032 return; 2033 2034 if (task->tk_status == 0) { 2035 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2036 switch (data->o_res.f_attr->mode & S_IFMT) { 2037 case S_IFREG: 2038 break; 2039 case S_IFLNK: 2040 data->rpc_status = -ELOOP; 2041 break; 2042 case S_IFDIR: 2043 data->rpc_status = -EISDIR; 2044 break; 2045 default: 2046 data->rpc_status = -ENOTDIR; 2047 } 2048 } 2049 renew_lease(data->o_res.server, data->timestamp); 2050 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2051 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2052 } 2053 data->rpc_done = 1; 2054 } 2055 2056 static void nfs4_open_release(void *calldata) 2057 { 2058 struct nfs4_opendata *data = calldata; 2059 struct nfs4_state *state = NULL; 2060 2061 /* If this request hasn't been cancelled, do nothing */ 2062 if (data->cancelled == 0) 2063 goto out_free; 2064 /* In case of error, no cleanup! */ 2065 if (data->rpc_status != 0 || !data->rpc_done) 2066 goto out_free; 2067 /* In case we need an open_confirm, no cleanup! */ 2068 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2069 goto out_free; 2070 state = nfs4_opendata_to_nfs4_state(data); 2071 if (!IS_ERR(state)) 2072 nfs4_close_state(state, data->o_arg.fmode); 2073 out_free: 2074 nfs4_opendata_put(data); 2075 } 2076 2077 static const struct rpc_call_ops nfs4_open_ops = { 2078 .rpc_call_prepare = nfs4_open_prepare, 2079 .rpc_call_done = nfs4_open_done, 2080 .rpc_release = nfs4_open_release, 2081 }; 2082 2083 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 2084 { 2085 struct inode *dir = d_inode(data->dir); 2086 struct nfs_server *server = NFS_SERVER(dir); 2087 struct nfs_openargs *o_arg = &data->o_arg; 2088 struct nfs_openres *o_res = &data->o_res; 2089 struct rpc_task *task; 2090 struct rpc_message msg = { 2091 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2092 .rpc_argp = o_arg, 2093 .rpc_resp = o_res, 2094 .rpc_cred = data->owner->so_cred, 2095 }; 2096 struct rpc_task_setup task_setup_data = { 2097 .rpc_client = server->client, 2098 .rpc_message = &msg, 2099 .callback_ops = &nfs4_open_ops, 2100 .callback_data = data, 2101 .workqueue = nfsiod_workqueue, 2102 .flags = RPC_TASK_ASYNC, 2103 }; 2104 int status; 2105 2106 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 2107 kref_get(&data->kref); 2108 data->rpc_done = 0; 2109 data->rpc_status = 0; 2110 data->cancelled = 0; 2111 data->is_recover = 0; 2112 if (isrecover) { 2113 nfs4_set_sequence_privileged(&o_arg->seq_args); 2114 data->is_recover = 1; 2115 } 2116 task = rpc_run_task(&task_setup_data); 2117 if (IS_ERR(task)) 2118 return PTR_ERR(task); 2119 status = nfs4_wait_for_completion_rpc_task(task); 2120 if (status != 0) { 2121 data->cancelled = 1; 2122 smp_wmb(); 2123 } else 2124 status = data->rpc_status; 2125 rpc_put_task(task); 2126 2127 return status; 2128 } 2129 2130 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2131 { 2132 struct inode *dir = d_inode(data->dir); 2133 struct nfs_openres *o_res = &data->o_res; 2134 int status; 2135 2136 status = nfs4_run_open_task(data, 1); 2137 if (status != 0 || !data->rpc_done) 2138 return status; 2139 2140 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2141 2142 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2143 status = _nfs4_proc_open_confirm(data); 2144 if (status != 0) 2145 return status; 2146 } 2147 2148 return status; 2149 } 2150 2151 /* 2152 * Additional permission checks in order to distinguish between an 2153 * open for read, and an open for execute. This works around the 2154 * fact that NFSv4 OPEN treats read and execute permissions as being 2155 * the same. 2156 * Note that in the non-execute case, we want to turn off permission 2157 * checking if we just created a new file (POSIX open() semantics). 2158 */ 2159 static int nfs4_opendata_access(struct rpc_cred *cred, 2160 struct nfs4_opendata *opendata, 2161 struct nfs4_state *state, fmode_t fmode, 2162 int openflags) 2163 { 2164 struct nfs_access_entry cache; 2165 u32 mask; 2166 2167 /* access call failed or for some reason the server doesn't 2168 * support any access modes -- defer access call until later */ 2169 if (opendata->o_res.access_supported == 0) 2170 return 0; 2171 2172 mask = 0; 2173 /* 2174 * Use openflags to check for exec, because fmode won't 2175 * always have FMODE_EXEC set when file open for exec. 2176 */ 2177 if (openflags & __FMODE_EXEC) { 2178 /* ONLY check for exec rights */ 2179 mask = MAY_EXEC; 2180 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2181 mask = MAY_READ; 2182 2183 cache.cred = cred; 2184 cache.jiffies = jiffies; 2185 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2186 nfs_access_add_cache(state->inode, &cache); 2187 2188 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 2189 return 0; 2190 2191 /* even though OPEN succeeded, access is denied. Close the file */ 2192 nfs4_close_state(state, fmode); 2193 return -EACCES; 2194 } 2195 2196 /* 2197 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2198 */ 2199 static int _nfs4_proc_open(struct nfs4_opendata *data) 2200 { 2201 struct inode *dir = d_inode(data->dir); 2202 struct nfs_server *server = NFS_SERVER(dir); 2203 struct nfs_openargs *o_arg = &data->o_arg; 2204 struct nfs_openres *o_res = &data->o_res; 2205 int status; 2206 2207 status = nfs4_run_open_task(data, 0); 2208 if (!data->rpc_done) 2209 return status; 2210 if (status != 0) { 2211 if (status == -NFS4ERR_BADNAME && 2212 !(o_arg->open_flags & O_CREAT)) 2213 return -ENOENT; 2214 return status; 2215 } 2216 2217 nfs_fattr_map_and_free_names(server, &data->f_attr); 2218 2219 if (o_arg->open_flags & O_CREAT) { 2220 update_changeattr(dir, &o_res->cinfo); 2221 if (o_arg->open_flags & O_EXCL) 2222 data->file_created = 1; 2223 else if (o_res->cinfo.before != o_res->cinfo.after) 2224 data->file_created = 1; 2225 } 2226 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2227 server->caps &= ~NFS_CAP_POSIX_LOCK; 2228 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2229 status = _nfs4_proc_open_confirm(data); 2230 if (status != 0) 2231 return status; 2232 } 2233 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 2234 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2235 return 0; 2236 } 2237 2238 static int nfs4_recover_expired_lease(struct nfs_server *server) 2239 { 2240 return nfs4_client_recover_expired_lease(server->nfs_client); 2241 } 2242 2243 /* 2244 * OPEN_EXPIRED: 2245 * reclaim state on the server after a network partition. 2246 * Assumes caller holds the appropriate lock 2247 */ 2248 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2249 { 2250 struct nfs4_opendata *opendata; 2251 int ret; 2252 2253 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2254 NFS4_OPEN_CLAIM_FH); 2255 if (IS_ERR(opendata)) 2256 return PTR_ERR(opendata); 2257 ret = nfs4_open_recover(opendata, state); 2258 if (ret == -ESTALE) 2259 d_drop(ctx->dentry); 2260 nfs4_opendata_put(opendata); 2261 return ret; 2262 } 2263 2264 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2265 { 2266 struct nfs_server *server = NFS_SERVER(state->inode); 2267 struct nfs4_exception exception = { }; 2268 int err; 2269 2270 do { 2271 err = _nfs4_open_expired(ctx, state); 2272 trace_nfs4_open_expired(ctx, 0, err); 2273 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2274 continue; 2275 switch (err) { 2276 default: 2277 goto out; 2278 case -NFS4ERR_GRACE: 2279 case -NFS4ERR_DELAY: 2280 nfs4_handle_exception(server, err, &exception); 2281 err = 0; 2282 } 2283 } while (exception.retry); 2284 out: 2285 return err; 2286 } 2287 2288 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2289 { 2290 struct nfs_open_context *ctx; 2291 int ret; 2292 2293 ctx = nfs4_state_find_open_context(state); 2294 if (IS_ERR(ctx)) 2295 return -EAGAIN; 2296 ret = nfs4_do_open_expired(ctx, state); 2297 put_nfs_open_context(ctx); 2298 return ret; 2299 } 2300 2301 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state) 2302 { 2303 nfs_remove_bad_delegation(state->inode); 2304 write_seqlock(&state->seqlock); 2305 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2306 write_sequnlock(&state->seqlock); 2307 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2308 } 2309 2310 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2311 { 2312 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2313 nfs_finish_clear_delegation_stateid(state); 2314 } 2315 2316 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2317 { 2318 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2319 nfs40_clear_delegation_stateid(state); 2320 return nfs4_open_expired(sp, state); 2321 } 2322 2323 #if defined(CONFIG_NFS_V4_1) 2324 static void nfs41_check_delegation_stateid(struct nfs4_state *state) 2325 { 2326 struct nfs_server *server = NFS_SERVER(state->inode); 2327 nfs4_stateid stateid; 2328 struct nfs_delegation *delegation; 2329 struct rpc_cred *cred; 2330 int status; 2331 2332 /* Get the delegation credential for use by test/free_stateid */ 2333 rcu_read_lock(); 2334 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2335 if (delegation == NULL) { 2336 rcu_read_unlock(); 2337 return; 2338 } 2339 2340 nfs4_stateid_copy(&stateid, &delegation->stateid); 2341 cred = get_rpccred(delegation->cred); 2342 rcu_read_unlock(); 2343 status = nfs41_test_stateid(server, &stateid, cred); 2344 trace_nfs4_test_delegation_stateid(state, NULL, status); 2345 2346 if (status != NFS_OK) { 2347 /* Free the stateid unless the server explicitly 2348 * informs us the stateid is unrecognized. */ 2349 if (status != -NFS4ERR_BAD_STATEID) 2350 nfs41_free_stateid(server, &stateid, cred); 2351 nfs_finish_clear_delegation_stateid(state); 2352 } 2353 2354 put_rpccred(cred); 2355 } 2356 2357 /** 2358 * nfs41_check_open_stateid - possibly free an open stateid 2359 * 2360 * @state: NFSv4 state for an inode 2361 * 2362 * Returns NFS_OK if recovery for this stateid is now finished. 2363 * Otherwise a negative NFS4ERR value is returned. 2364 */ 2365 static int nfs41_check_open_stateid(struct nfs4_state *state) 2366 { 2367 struct nfs_server *server = NFS_SERVER(state->inode); 2368 nfs4_stateid *stateid = &state->open_stateid; 2369 struct rpc_cred *cred = state->owner->so_cred; 2370 int status; 2371 2372 /* If a state reset has been done, test_stateid is unneeded */ 2373 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 2374 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 2375 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 2376 return -NFS4ERR_BAD_STATEID; 2377 2378 status = nfs41_test_stateid(server, stateid, cred); 2379 trace_nfs4_test_open_stateid(state, NULL, status); 2380 if (status != NFS_OK) { 2381 /* Free the stateid unless the server explicitly 2382 * informs us the stateid is unrecognized. */ 2383 if (status != -NFS4ERR_BAD_STATEID) 2384 nfs41_free_stateid(server, stateid, cred); 2385 2386 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2387 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2388 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2389 clear_bit(NFS_OPEN_STATE, &state->flags); 2390 } 2391 return status; 2392 } 2393 2394 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2395 { 2396 int status; 2397 2398 nfs41_check_delegation_stateid(state); 2399 status = nfs41_check_open_stateid(state); 2400 if (status != NFS_OK) 2401 status = nfs4_open_expired(sp, state); 2402 return status; 2403 } 2404 #endif 2405 2406 /* 2407 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2408 * fields corresponding to attributes that were used to store the verifier. 2409 * Make sure we clobber those fields in the later setattr call 2410 */ 2411 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 2412 struct iattr *sattr, struct nfs4_label **label) 2413 { 2414 const u32 *attrset = opendata->o_res.attrset; 2415 2416 if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2417 !(sattr->ia_valid & ATTR_ATIME_SET)) 2418 sattr->ia_valid |= ATTR_ATIME; 2419 2420 if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2421 !(sattr->ia_valid & ATTR_MTIME_SET)) 2422 sattr->ia_valid |= ATTR_MTIME; 2423 2424 /* Except MODE, it seems harmless of setting twice. */ 2425 if ((attrset[1] & FATTR4_WORD1_MODE)) 2426 sattr->ia_valid &= ~ATTR_MODE; 2427 2428 if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL) 2429 *label = NULL; 2430 } 2431 2432 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2433 fmode_t fmode, 2434 int flags, 2435 struct nfs_open_context *ctx) 2436 { 2437 struct nfs4_state_owner *sp = opendata->owner; 2438 struct nfs_server *server = sp->so_server; 2439 struct dentry *dentry; 2440 struct nfs4_state *state; 2441 unsigned int seq; 2442 int ret; 2443 2444 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2445 2446 ret = _nfs4_proc_open(opendata); 2447 if (ret != 0) 2448 goto out; 2449 2450 state = nfs4_opendata_to_nfs4_state(opendata); 2451 ret = PTR_ERR(state); 2452 if (IS_ERR(state)) 2453 goto out; 2454 if (server->caps & NFS_CAP_POSIX_LOCK) 2455 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2456 2457 dentry = opendata->dentry; 2458 if (d_really_is_negative(dentry)) { 2459 /* FIXME: Is this d_drop() ever needed? */ 2460 d_drop(dentry); 2461 dentry = d_add_unique(dentry, igrab(state->inode)); 2462 if (dentry == NULL) { 2463 dentry = opendata->dentry; 2464 } else if (dentry != ctx->dentry) { 2465 dput(ctx->dentry); 2466 ctx->dentry = dget(dentry); 2467 } 2468 nfs_set_verifier(dentry, 2469 nfs_save_change_attribute(d_inode(opendata->dir))); 2470 } 2471 2472 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2473 if (ret != 0) 2474 goto out; 2475 2476 ctx->state = state; 2477 if (d_inode(dentry) == state->inode) { 2478 nfs_inode_attach_open_context(ctx); 2479 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2480 nfs4_schedule_stateid_recovery(server, state); 2481 } 2482 out: 2483 return ret; 2484 } 2485 2486 /* 2487 * Returns a referenced nfs4_state 2488 */ 2489 static int _nfs4_do_open(struct inode *dir, 2490 struct nfs_open_context *ctx, 2491 int flags, 2492 struct iattr *sattr, 2493 struct nfs4_label *label, 2494 int *opened) 2495 { 2496 struct nfs4_state_owner *sp; 2497 struct nfs4_state *state = NULL; 2498 struct nfs_server *server = NFS_SERVER(dir); 2499 struct nfs4_opendata *opendata; 2500 struct dentry *dentry = ctx->dentry; 2501 struct rpc_cred *cred = ctx->cred; 2502 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2503 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2504 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2505 struct nfs4_label *olabel = NULL; 2506 int status; 2507 2508 /* Protect against reboot recovery conflicts */ 2509 status = -ENOMEM; 2510 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2511 if (sp == NULL) { 2512 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2513 goto out_err; 2514 } 2515 status = nfs4_recover_expired_lease(server); 2516 if (status != 0) 2517 goto err_put_state_owner; 2518 if (d_really_is_positive(dentry)) 2519 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 2520 status = -ENOMEM; 2521 if (d_really_is_positive(dentry)) 2522 claim = NFS4_OPEN_CLAIM_FH; 2523 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, 2524 label, claim, GFP_KERNEL); 2525 if (opendata == NULL) 2526 goto err_put_state_owner; 2527 2528 if (label) { 2529 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2530 if (IS_ERR(olabel)) { 2531 status = PTR_ERR(olabel); 2532 goto err_opendata_put; 2533 } 2534 } 2535 2536 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2537 if (!opendata->f_attr.mdsthreshold) { 2538 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2539 if (!opendata->f_attr.mdsthreshold) 2540 goto err_free_label; 2541 } 2542 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2543 } 2544 if (d_really_is_positive(dentry)) 2545 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 2546 2547 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2548 if (status != 0) 2549 goto err_free_label; 2550 state = ctx->state; 2551 2552 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 2553 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2554 nfs4_exclusive_attrset(opendata, sattr, &label); 2555 2556 nfs_fattr_init(opendata->o_res.f_attr); 2557 status = nfs4_do_setattr(state->inode, cred, 2558 opendata->o_res.f_attr, sattr, 2559 state, label, olabel); 2560 if (status == 0) { 2561 nfs_setattr_update_inode(state->inode, sattr, 2562 opendata->o_res.f_attr); 2563 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2564 } 2565 } 2566 if (opened && opendata->file_created) 2567 *opened |= FILE_CREATED; 2568 2569 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2570 *ctx_th = opendata->f_attr.mdsthreshold; 2571 opendata->f_attr.mdsthreshold = NULL; 2572 } 2573 2574 nfs4_label_free(olabel); 2575 2576 nfs4_opendata_put(opendata); 2577 nfs4_put_state_owner(sp); 2578 return 0; 2579 err_free_label: 2580 nfs4_label_free(olabel); 2581 err_opendata_put: 2582 nfs4_opendata_put(opendata); 2583 err_put_state_owner: 2584 nfs4_put_state_owner(sp); 2585 out_err: 2586 return status; 2587 } 2588 2589 2590 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2591 struct nfs_open_context *ctx, 2592 int flags, 2593 struct iattr *sattr, 2594 struct nfs4_label *label, 2595 int *opened) 2596 { 2597 struct nfs_server *server = NFS_SERVER(dir); 2598 struct nfs4_exception exception = { }; 2599 struct nfs4_state *res; 2600 int status; 2601 2602 do { 2603 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened); 2604 res = ctx->state; 2605 trace_nfs4_open_file(ctx, flags, status); 2606 if (status == 0) 2607 break; 2608 /* NOTE: BAD_SEQID means the server and client disagree about the 2609 * book-keeping w.r.t. state-changing operations 2610 * (OPEN/CLOSE/LOCK/LOCKU...) 2611 * It is actually a sign of a bug on the client or on the server. 2612 * 2613 * If we receive a BAD_SEQID error in the particular case of 2614 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2615 * have unhashed the old state_owner for us, and that we can 2616 * therefore safely retry using a new one. We should still warn 2617 * the user though... 2618 */ 2619 if (status == -NFS4ERR_BAD_SEQID) { 2620 pr_warn_ratelimited("NFS: v4 server %s " 2621 " returned a bad sequence-id error!\n", 2622 NFS_SERVER(dir)->nfs_client->cl_hostname); 2623 exception.retry = 1; 2624 continue; 2625 } 2626 /* 2627 * BAD_STATEID on OPEN means that the server cancelled our 2628 * state before it received the OPEN_CONFIRM. 2629 * Recover by retrying the request as per the discussion 2630 * on Page 181 of RFC3530. 2631 */ 2632 if (status == -NFS4ERR_BAD_STATEID) { 2633 exception.retry = 1; 2634 continue; 2635 } 2636 if (status == -EAGAIN) { 2637 /* We must have found a delegation */ 2638 exception.retry = 1; 2639 continue; 2640 } 2641 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2642 continue; 2643 res = ERR_PTR(nfs4_handle_exception(server, 2644 status, &exception)); 2645 } while (exception.retry); 2646 return res; 2647 } 2648 2649 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2650 struct nfs_fattr *fattr, struct iattr *sattr, 2651 struct nfs4_state *state, struct nfs4_label *ilabel, 2652 struct nfs4_label *olabel) 2653 { 2654 struct nfs_server *server = NFS_SERVER(inode); 2655 struct nfs_setattrargs arg = { 2656 .fh = NFS_FH(inode), 2657 .iap = sattr, 2658 .server = server, 2659 .bitmask = server->attr_bitmask, 2660 .label = ilabel, 2661 }; 2662 struct nfs_setattrres res = { 2663 .fattr = fattr, 2664 .label = olabel, 2665 .server = server, 2666 }; 2667 struct rpc_message msg = { 2668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2669 .rpc_argp = &arg, 2670 .rpc_resp = &res, 2671 .rpc_cred = cred, 2672 }; 2673 unsigned long timestamp = jiffies; 2674 fmode_t fmode; 2675 bool truncate; 2676 int status; 2677 2678 arg.bitmask = nfs4_bitmask(server, ilabel); 2679 if (ilabel) 2680 arg.bitmask = nfs4_bitmask(server, olabel); 2681 2682 nfs_fattr_init(fattr); 2683 2684 /* Servers should only apply open mode checks for file size changes */ 2685 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false; 2686 fmode = truncate ? FMODE_WRITE : FMODE_READ; 2687 2688 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) { 2689 /* Use that stateid */ 2690 } else if (truncate && state != NULL) { 2691 struct nfs_lockowner lockowner = { 2692 .l_owner = current->files, 2693 .l_pid = current->tgid, 2694 }; 2695 if (!nfs4_valid_open_stateid(state)) 2696 return -EBADF; 2697 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE, 2698 &lockowner) == -EIO) 2699 return -EBADF; 2700 } else 2701 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 2702 2703 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 2704 if (status == 0 && state != NULL) 2705 renew_lease(server, timestamp); 2706 return status; 2707 } 2708 2709 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2710 struct nfs_fattr *fattr, struct iattr *sattr, 2711 struct nfs4_state *state, struct nfs4_label *ilabel, 2712 struct nfs4_label *olabel) 2713 { 2714 struct nfs_server *server = NFS_SERVER(inode); 2715 struct nfs4_exception exception = { 2716 .state = state, 2717 .inode = inode, 2718 }; 2719 int err; 2720 do { 2721 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel); 2722 trace_nfs4_setattr(inode, err); 2723 switch (err) { 2724 case -NFS4ERR_OPENMODE: 2725 if (!(sattr->ia_valid & ATTR_SIZE)) { 2726 pr_warn_once("NFSv4: server %s is incorrectly " 2727 "applying open mode checks to " 2728 "a SETATTR that is not " 2729 "changing file size.\n", 2730 server->nfs_client->cl_hostname); 2731 } 2732 if (state && !(state->state & FMODE_WRITE)) { 2733 err = -EBADF; 2734 if (sattr->ia_valid & ATTR_OPEN) 2735 err = -EACCES; 2736 goto out; 2737 } 2738 } 2739 err = nfs4_handle_exception(server, err, &exception); 2740 } while (exception.retry); 2741 out: 2742 return err; 2743 } 2744 2745 static bool 2746 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 2747 { 2748 if (inode == NULL || !nfs_have_layout(inode)) 2749 return false; 2750 2751 return pnfs_wait_on_layoutreturn(inode, task); 2752 } 2753 2754 struct nfs4_closedata { 2755 struct inode *inode; 2756 struct nfs4_state *state; 2757 struct nfs_closeargs arg; 2758 struct nfs_closeres res; 2759 struct nfs_fattr fattr; 2760 unsigned long timestamp; 2761 bool roc; 2762 u32 roc_barrier; 2763 }; 2764 2765 static void nfs4_free_closedata(void *data) 2766 { 2767 struct nfs4_closedata *calldata = data; 2768 struct nfs4_state_owner *sp = calldata->state->owner; 2769 struct super_block *sb = calldata->state->inode->i_sb; 2770 2771 if (calldata->roc) 2772 pnfs_roc_release(calldata->state->inode); 2773 nfs4_put_open_state(calldata->state); 2774 nfs_free_seqid(calldata->arg.seqid); 2775 nfs4_put_state_owner(sp); 2776 nfs_sb_deactive(sb); 2777 kfree(calldata); 2778 } 2779 2780 static void nfs4_close_done(struct rpc_task *task, void *data) 2781 { 2782 struct nfs4_closedata *calldata = data; 2783 struct nfs4_state *state = calldata->state; 2784 struct nfs_server *server = NFS_SERVER(calldata->inode); 2785 nfs4_stateid *res_stateid = NULL; 2786 2787 dprintk("%s: begin!\n", __func__); 2788 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2789 return; 2790 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 2791 /* hmm. we are done with the inode, and in the process of freeing 2792 * the state_owner. we keep this around to process errors 2793 */ 2794 switch (task->tk_status) { 2795 case 0: 2796 res_stateid = &calldata->res.stateid; 2797 if (calldata->roc) 2798 pnfs_roc_set_barrier(state->inode, 2799 calldata->roc_barrier); 2800 renew_lease(server, calldata->timestamp); 2801 break; 2802 case -NFS4ERR_ADMIN_REVOKED: 2803 case -NFS4ERR_STALE_STATEID: 2804 case -NFS4ERR_OLD_STATEID: 2805 case -NFS4ERR_BAD_STATEID: 2806 case -NFS4ERR_EXPIRED: 2807 if (!nfs4_stateid_match(&calldata->arg.stateid, 2808 &state->open_stateid)) { 2809 rpc_restart_call_prepare(task); 2810 goto out_release; 2811 } 2812 if (calldata->arg.fmode == 0) 2813 break; 2814 default: 2815 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) { 2816 rpc_restart_call_prepare(task); 2817 goto out_release; 2818 } 2819 } 2820 nfs_clear_open_stateid(state, &calldata->arg.stateid, 2821 res_stateid, calldata->arg.fmode); 2822 out_release: 2823 nfs_release_seqid(calldata->arg.seqid); 2824 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2825 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2826 } 2827 2828 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2829 { 2830 struct nfs4_closedata *calldata = data; 2831 struct nfs4_state *state = calldata->state; 2832 struct inode *inode = calldata->inode; 2833 bool is_rdonly, is_wronly, is_rdwr; 2834 int call_close = 0; 2835 2836 dprintk("%s: begin!\n", __func__); 2837 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2838 goto out_wait; 2839 2840 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2841 spin_lock(&state->owner->so_lock); 2842 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 2843 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 2844 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 2845 nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid); 2846 /* Calculate the change in open mode */ 2847 calldata->arg.fmode = 0; 2848 if (state->n_rdwr == 0) { 2849 if (state->n_rdonly == 0) 2850 call_close |= is_rdonly; 2851 else if (is_rdonly) 2852 calldata->arg.fmode |= FMODE_READ; 2853 if (state->n_wronly == 0) 2854 call_close |= is_wronly; 2855 else if (is_wronly) 2856 calldata->arg.fmode |= FMODE_WRITE; 2857 } else if (is_rdwr) 2858 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 2859 2860 if (calldata->arg.fmode == 0) 2861 call_close |= is_rdwr; 2862 2863 if (!nfs4_valid_open_stateid(state)) 2864 call_close = 0; 2865 spin_unlock(&state->owner->so_lock); 2866 2867 if (!call_close) { 2868 /* Note: exit _without_ calling nfs4_close_done */ 2869 goto out_no_action; 2870 } 2871 2872 if (nfs4_wait_on_layoutreturn(inode, task)) { 2873 nfs_release_seqid(calldata->arg.seqid); 2874 goto out_wait; 2875 } 2876 2877 if (calldata->arg.fmode == 0) 2878 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2879 if (calldata->roc) 2880 pnfs_roc_get_barrier(inode, &calldata->roc_barrier); 2881 2882 calldata->arg.share_access = 2883 nfs4_map_atomic_open_share(NFS_SERVER(inode), 2884 calldata->arg.fmode, 0); 2885 2886 nfs_fattr_init(calldata->res.fattr); 2887 calldata->timestamp = jiffies; 2888 if (nfs4_setup_sequence(NFS_SERVER(inode), 2889 &calldata->arg.seq_args, 2890 &calldata->res.seq_res, 2891 task) != 0) 2892 nfs_release_seqid(calldata->arg.seqid); 2893 dprintk("%s: done!\n", __func__); 2894 return; 2895 out_no_action: 2896 task->tk_action = NULL; 2897 out_wait: 2898 nfs4_sequence_done(task, &calldata->res.seq_res); 2899 } 2900 2901 static const struct rpc_call_ops nfs4_close_ops = { 2902 .rpc_call_prepare = nfs4_close_prepare, 2903 .rpc_call_done = nfs4_close_done, 2904 .rpc_release = nfs4_free_closedata, 2905 }; 2906 2907 static bool nfs4_roc(struct inode *inode) 2908 { 2909 if (!nfs_have_layout(inode)) 2910 return false; 2911 return pnfs_roc(inode); 2912 } 2913 2914 /* 2915 * It is possible for data to be read/written from a mem-mapped file 2916 * after the sys_close call (which hits the vfs layer as a flush). 2917 * This means that we can't safely call nfsv4 close on a file until 2918 * the inode is cleared. This in turn means that we are not good 2919 * NFSv4 citizens - we do not indicate to the server to update the file's 2920 * share state even when we are done with one of the three share 2921 * stateid's in the inode. 2922 * 2923 * NOTE: Caller must be holding the sp->so_owner semaphore! 2924 */ 2925 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2926 { 2927 struct nfs_server *server = NFS_SERVER(state->inode); 2928 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 2929 struct nfs4_closedata *calldata; 2930 struct nfs4_state_owner *sp = state->owner; 2931 struct rpc_task *task; 2932 struct rpc_message msg = { 2933 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2934 .rpc_cred = state->owner->so_cred, 2935 }; 2936 struct rpc_task_setup task_setup_data = { 2937 .rpc_client = server->client, 2938 .rpc_message = &msg, 2939 .callback_ops = &nfs4_close_ops, 2940 .workqueue = nfsiod_workqueue, 2941 .flags = RPC_TASK_ASYNC, 2942 }; 2943 int status = -ENOMEM; 2944 2945 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 2946 &task_setup_data.rpc_client, &msg); 2947 2948 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2949 if (calldata == NULL) 2950 goto out; 2951 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2952 calldata->inode = state->inode; 2953 calldata->state = state; 2954 calldata->arg.fh = NFS_FH(state->inode); 2955 /* Serialization for the sequence id */ 2956 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 2957 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 2958 if (IS_ERR(calldata->arg.seqid)) 2959 goto out_free_calldata; 2960 calldata->arg.fmode = 0; 2961 calldata->arg.bitmask = server->cache_consistency_bitmask; 2962 calldata->res.fattr = &calldata->fattr; 2963 calldata->res.seqid = calldata->arg.seqid; 2964 calldata->res.server = server; 2965 calldata->roc = nfs4_roc(state->inode); 2966 nfs_sb_active(calldata->inode->i_sb); 2967 2968 msg.rpc_argp = &calldata->arg; 2969 msg.rpc_resp = &calldata->res; 2970 task_setup_data.callback_data = calldata; 2971 task = rpc_run_task(&task_setup_data); 2972 if (IS_ERR(task)) 2973 return PTR_ERR(task); 2974 status = 0; 2975 if (wait) 2976 status = rpc_wait_for_completion_task(task); 2977 rpc_put_task(task); 2978 return status; 2979 out_free_calldata: 2980 kfree(calldata); 2981 out: 2982 nfs4_put_open_state(state); 2983 nfs4_put_state_owner(sp); 2984 return status; 2985 } 2986 2987 static struct inode * 2988 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 2989 int open_flags, struct iattr *attr, int *opened) 2990 { 2991 struct nfs4_state *state; 2992 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 2993 2994 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 2995 2996 /* Protect against concurrent sillydeletes */ 2997 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 2998 2999 nfs4_label_release_security(label); 3000 3001 if (IS_ERR(state)) 3002 return ERR_CAST(state); 3003 return state->inode; 3004 } 3005 3006 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3007 { 3008 if (ctx->state == NULL) 3009 return; 3010 if (is_sync) 3011 nfs4_close_sync(ctx->state, ctx->mode); 3012 else 3013 nfs4_close_state(ctx->state, ctx->mode); 3014 } 3015 3016 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3017 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3018 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL) 3019 3020 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3021 { 3022 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3023 struct nfs4_server_caps_arg args = { 3024 .fhandle = fhandle, 3025 .bitmask = bitmask, 3026 }; 3027 struct nfs4_server_caps_res res = {}; 3028 struct rpc_message msg = { 3029 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3030 .rpc_argp = &args, 3031 .rpc_resp = &res, 3032 }; 3033 int status; 3034 3035 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3036 FATTR4_WORD0_FH_EXPIRE_TYPE | 3037 FATTR4_WORD0_LINK_SUPPORT | 3038 FATTR4_WORD0_SYMLINK_SUPPORT | 3039 FATTR4_WORD0_ACLSUPPORT; 3040 if (minorversion) 3041 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3042 3043 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3044 if (status == 0) { 3045 /* Sanity check the server answers */ 3046 switch (minorversion) { 3047 case 0: 3048 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3049 res.attr_bitmask[2] = 0; 3050 break; 3051 case 1: 3052 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3053 break; 3054 case 2: 3055 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3056 } 3057 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3058 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 3059 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 3060 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 3061 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 3062 NFS_CAP_CTIME|NFS_CAP_MTIME| 3063 NFS_CAP_SECURITY_LABEL); 3064 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3065 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3066 server->caps |= NFS_CAP_ACLS; 3067 if (res.has_links != 0) 3068 server->caps |= NFS_CAP_HARDLINKS; 3069 if (res.has_symlinks != 0) 3070 server->caps |= NFS_CAP_SYMLINKS; 3071 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 3072 server->caps |= NFS_CAP_FILEID; 3073 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 3074 server->caps |= NFS_CAP_MODE; 3075 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 3076 server->caps |= NFS_CAP_NLINK; 3077 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 3078 server->caps |= NFS_CAP_OWNER; 3079 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 3080 server->caps |= NFS_CAP_OWNER_GROUP; 3081 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 3082 server->caps |= NFS_CAP_ATIME; 3083 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 3084 server->caps |= NFS_CAP_CTIME; 3085 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 3086 server->caps |= NFS_CAP_MTIME; 3087 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3088 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3089 server->caps |= NFS_CAP_SECURITY_LABEL; 3090 #endif 3091 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3092 sizeof(server->attr_bitmask)); 3093 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3094 3095 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3096 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3097 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3098 server->cache_consistency_bitmask[2] = 0; 3099 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3100 sizeof(server->exclcreat_bitmask)); 3101 server->acl_bitmask = res.acl_bitmask; 3102 server->fh_expire_type = res.fh_expire_type; 3103 } 3104 3105 return status; 3106 } 3107 3108 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3109 { 3110 struct nfs4_exception exception = { }; 3111 int err; 3112 do { 3113 err = nfs4_handle_exception(server, 3114 _nfs4_server_capabilities(server, fhandle), 3115 &exception); 3116 } while (exception.retry); 3117 return err; 3118 } 3119 3120 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3121 struct nfs_fsinfo *info) 3122 { 3123 u32 bitmask[3]; 3124 struct nfs4_lookup_root_arg args = { 3125 .bitmask = bitmask, 3126 }; 3127 struct nfs4_lookup_res res = { 3128 .server = server, 3129 .fattr = info->fattr, 3130 .fh = fhandle, 3131 }; 3132 struct rpc_message msg = { 3133 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 3134 .rpc_argp = &args, 3135 .rpc_resp = &res, 3136 }; 3137 3138 bitmask[0] = nfs4_fattr_bitmap[0]; 3139 bitmask[1] = nfs4_fattr_bitmap[1]; 3140 /* 3141 * Process the label in the upcoming getfattr 3142 */ 3143 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 3144 3145 nfs_fattr_init(info->fattr); 3146 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3147 } 3148 3149 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 3150 struct nfs_fsinfo *info) 3151 { 3152 struct nfs4_exception exception = { }; 3153 int err; 3154 do { 3155 err = _nfs4_lookup_root(server, fhandle, info); 3156 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 3157 switch (err) { 3158 case 0: 3159 case -NFS4ERR_WRONGSEC: 3160 goto out; 3161 default: 3162 err = nfs4_handle_exception(server, err, &exception); 3163 } 3164 } while (exception.retry); 3165 out: 3166 return err; 3167 } 3168 3169 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3170 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 3171 { 3172 struct rpc_auth_create_args auth_args = { 3173 .pseudoflavor = flavor, 3174 }; 3175 struct rpc_auth *auth; 3176 int ret; 3177 3178 auth = rpcauth_create(&auth_args, server->client); 3179 if (IS_ERR(auth)) { 3180 ret = -EACCES; 3181 goto out; 3182 } 3183 ret = nfs4_lookup_root(server, fhandle, info); 3184 out: 3185 return ret; 3186 } 3187 3188 /* 3189 * Retry pseudoroot lookup with various security flavors. We do this when: 3190 * 3191 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 3192 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 3193 * 3194 * Returns zero on success, or a negative NFS4ERR value, or a 3195 * negative errno value. 3196 */ 3197 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 3198 struct nfs_fsinfo *info) 3199 { 3200 /* Per 3530bis 15.33.5 */ 3201 static const rpc_authflavor_t flav_array[] = { 3202 RPC_AUTH_GSS_KRB5P, 3203 RPC_AUTH_GSS_KRB5I, 3204 RPC_AUTH_GSS_KRB5, 3205 RPC_AUTH_UNIX, /* courtesy */ 3206 RPC_AUTH_NULL, 3207 }; 3208 int status = -EPERM; 3209 size_t i; 3210 3211 if (server->auth_info.flavor_len > 0) { 3212 /* try each flavor specified by user */ 3213 for (i = 0; i < server->auth_info.flavor_len; i++) { 3214 status = nfs4_lookup_root_sec(server, fhandle, info, 3215 server->auth_info.flavors[i]); 3216 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3217 continue; 3218 break; 3219 } 3220 } else { 3221 /* no flavors specified by user, try default list */ 3222 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3223 status = nfs4_lookup_root_sec(server, fhandle, info, 3224 flav_array[i]); 3225 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3226 continue; 3227 break; 3228 } 3229 } 3230 3231 /* 3232 * -EACCESS could mean that the user doesn't have correct permissions 3233 * to access the mount. It could also mean that we tried to mount 3234 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3235 * existing mount programs don't handle -EACCES very well so it should 3236 * be mapped to -EPERM instead. 3237 */ 3238 if (status == -EACCES) 3239 status = -EPERM; 3240 return status; 3241 } 3242 3243 static int nfs4_do_find_root_sec(struct nfs_server *server, 3244 struct nfs_fh *fhandle, struct nfs_fsinfo *info) 3245 { 3246 int mv = server->nfs_client->cl_minorversion; 3247 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info); 3248 } 3249 3250 /** 3251 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3252 * @server: initialized nfs_server handle 3253 * @fhandle: we fill in the pseudo-fs root file handle 3254 * @info: we fill in an FSINFO struct 3255 * @auth_probe: probe the auth flavours 3256 * 3257 * Returns zero on success, or a negative errno. 3258 */ 3259 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3260 struct nfs_fsinfo *info, 3261 bool auth_probe) 3262 { 3263 int status = 0; 3264 3265 if (!auth_probe) 3266 status = nfs4_lookup_root(server, fhandle, info); 3267 3268 if (auth_probe || status == NFS4ERR_WRONGSEC) 3269 status = nfs4_do_find_root_sec(server, fhandle, info); 3270 3271 if (status == 0) 3272 status = nfs4_server_capabilities(server, fhandle); 3273 if (status == 0) 3274 status = nfs4_do_fsinfo(server, fhandle, info); 3275 3276 return nfs4_map_errors(status); 3277 } 3278 3279 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3280 struct nfs_fsinfo *info) 3281 { 3282 int error; 3283 struct nfs_fattr *fattr = info->fattr; 3284 struct nfs4_label *label = NULL; 3285 3286 error = nfs4_server_capabilities(server, mntfh); 3287 if (error < 0) { 3288 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3289 return error; 3290 } 3291 3292 label = nfs4_label_alloc(server, GFP_KERNEL); 3293 if (IS_ERR(label)) 3294 return PTR_ERR(label); 3295 3296 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3297 if (error < 0) { 3298 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3299 goto err_free_label; 3300 } 3301 3302 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3303 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3304 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3305 3306 err_free_label: 3307 nfs4_label_free(label); 3308 3309 return error; 3310 } 3311 3312 /* 3313 * Get locations and (maybe) other attributes of a referral. 3314 * Note that we'll actually follow the referral later when 3315 * we detect fsid mismatch in inode revalidation 3316 */ 3317 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3318 const struct qstr *name, struct nfs_fattr *fattr, 3319 struct nfs_fh *fhandle) 3320 { 3321 int status = -ENOMEM; 3322 struct page *page = NULL; 3323 struct nfs4_fs_locations *locations = NULL; 3324 3325 page = alloc_page(GFP_KERNEL); 3326 if (page == NULL) 3327 goto out; 3328 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3329 if (locations == NULL) 3330 goto out; 3331 3332 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3333 if (status != 0) 3334 goto out; 3335 3336 /* 3337 * If the fsid didn't change, this is a migration event, not a 3338 * referral. Cause us to drop into the exception handler, which 3339 * will kick off migration recovery. 3340 */ 3341 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3342 dprintk("%s: server did not return a different fsid for" 3343 " a referral at %s\n", __func__, name->name); 3344 status = -NFS4ERR_MOVED; 3345 goto out; 3346 } 3347 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3348 nfs_fixup_referral_attributes(&locations->fattr); 3349 3350 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3351 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3352 memset(fhandle, 0, sizeof(struct nfs_fh)); 3353 out: 3354 if (page) 3355 __free_page(page); 3356 kfree(locations); 3357 return status; 3358 } 3359 3360 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3361 struct nfs_fattr *fattr, struct nfs4_label *label) 3362 { 3363 struct nfs4_getattr_arg args = { 3364 .fh = fhandle, 3365 .bitmask = server->attr_bitmask, 3366 }; 3367 struct nfs4_getattr_res res = { 3368 .fattr = fattr, 3369 .label = label, 3370 .server = server, 3371 }; 3372 struct rpc_message msg = { 3373 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3374 .rpc_argp = &args, 3375 .rpc_resp = &res, 3376 }; 3377 3378 args.bitmask = nfs4_bitmask(server, label); 3379 3380 nfs_fattr_init(fattr); 3381 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3382 } 3383 3384 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3385 struct nfs_fattr *fattr, struct nfs4_label *label) 3386 { 3387 struct nfs4_exception exception = { }; 3388 int err; 3389 do { 3390 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3391 trace_nfs4_getattr(server, fhandle, fattr, err); 3392 err = nfs4_handle_exception(server, err, 3393 &exception); 3394 } while (exception.retry); 3395 return err; 3396 } 3397 3398 /* 3399 * The file is not closed if it is opened due to the a request to change 3400 * the size of the file. The open call will not be needed once the 3401 * VFS layer lookup-intents are implemented. 3402 * 3403 * Close is called when the inode is destroyed. 3404 * If we haven't opened the file for O_WRONLY, we 3405 * need to in the size_change case to obtain a stateid. 3406 * 3407 * Got race? 3408 * Because OPEN is always done by name in nfsv4, it is 3409 * possible that we opened a different file by the same 3410 * name. We can recognize this race condition, but we 3411 * can't do anything about it besides returning an error. 3412 * 3413 * This will be fixed with VFS changes (lookup-intent). 3414 */ 3415 static int 3416 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3417 struct iattr *sattr) 3418 { 3419 struct inode *inode = d_inode(dentry); 3420 struct rpc_cred *cred = NULL; 3421 struct nfs4_state *state = NULL; 3422 struct nfs4_label *label = NULL; 3423 int status; 3424 3425 if (pnfs_ld_layoutret_on_setattr(inode) && 3426 sattr->ia_valid & ATTR_SIZE && 3427 sattr->ia_size < i_size_read(inode)) 3428 pnfs_commit_and_return_layout(inode); 3429 3430 nfs_fattr_init(fattr); 3431 3432 /* Deal with open(O_TRUNC) */ 3433 if (sattr->ia_valid & ATTR_OPEN) 3434 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3435 3436 /* Optimization: if the end result is no change, don't RPC */ 3437 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3438 return 0; 3439 3440 /* Search for an existing open(O_WRITE) file */ 3441 if (sattr->ia_valid & ATTR_FILE) { 3442 struct nfs_open_context *ctx; 3443 3444 ctx = nfs_file_open_context(sattr->ia_file); 3445 if (ctx) { 3446 cred = ctx->cred; 3447 state = ctx->state; 3448 } 3449 } 3450 3451 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3452 if (IS_ERR(label)) 3453 return PTR_ERR(label); 3454 3455 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label); 3456 if (status == 0) { 3457 nfs_setattr_update_inode(inode, sattr, fattr); 3458 nfs_setsecurity(inode, fattr, label); 3459 } 3460 nfs4_label_free(label); 3461 return status; 3462 } 3463 3464 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3465 const struct qstr *name, struct nfs_fh *fhandle, 3466 struct nfs_fattr *fattr, struct nfs4_label *label) 3467 { 3468 struct nfs_server *server = NFS_SERVER(dir); 3469 int status; 3470 struct nfs4_lookup_arg args = { 3471 .bitmask = server->attr_bitmask, 3472 .dir_fh = NFS_FH(dir), 3473 .name = name, 3474 }; 3475 struct nfs4_lookup_res res = { 3476 .server = server, 3477 .fattr = fattr, 3478 .label = label, 3479 .fh = fhandle, 3480 }; 3481 struct rpc_message msg = { 3482 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3483 .rpc_argp = &args, 3484 .rpc_resp = &res, 3485 }; 3486 3487 args.bitmask = nfs4_bitmask(server, label); 3488 3489 nfs_fattr_init(fattr); 3490 3491 dprintk("NFS call lookup %s\n", name->name); 3492 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3493 dprintk("NFS reply lookup: %d\n", status); 3494 return status; 3495 } 3496 3497 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3498 { 3499 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3500 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3501 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3502 fattr->nlink = 2; 3503 } 3504 3505 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3506 struct qstr *name, struct nfs_fh *fhandle, 3507 struct nfs_fattr *fattr, struct nfs4_label *label) 3508 { 3509 struct nfs4_exception exception = { }; 3510 struct rpc_clnt *client = *clnt; 3511 int err; 3512 do { 3513 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3514 trace_nfs4_lookup(dir, name, err); 3515 switch (err) { 3516 case -NFS4ERR_BADNAME: 3517 err = -ENOENT; 3518 goto out; 3519 case -NFS4ERR_MOVED: 3520 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3521 if (err == -NFS4ERR_MOVED) 3522 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3523 goto out; 3524 case -NFS4ERR_WRONGSEC: 3525 err = -EPERM; 3526 if (client != *clnt) 3527 goto out; 3528 client = nfs4_negotiate_security(client, dir, name); 3529 if (IS_ERR(client)) 3530 return PTR_ERR(client); 3531 3532 exception.retry = 1; 3533 break; 3534 default: 3535 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3536 } 3537 } while (exception.retry); 3538 3539 out: 3540 if (err == 0) 3541 *clnt = client; 3542 else if (client != *clnt) 3543 rpc_shutdown_client(client); 3544 3545 return err; 3546 } 3547 3548 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, 3549 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3550 struct nfs4_label *label) 3551 { 3552 int status; 3553 struct rpc_clnt *client = NFS_CLIENT(dir); 3554 3555 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3556 if (client != NFS_CLIENT(dir)) { 3557 rpc_shutdown_client(client); 3558 nfs_fixup_secinfo_attributes(fattr); 3559 } 3560 return status; 3561 } 3562 3563 struct rpc_clnt * 3564 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name, 3565 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3566 { 3567 struct rpc_clnt *client = NFS_CLIENT(dir); 3568 int status; 3569 3570 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3571 if (status < 0) 3572 return ERR_PTR(status); 3573 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3574 } 3575 3576 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3577 { 3578 struct nfs_server *server = NFS_SERVER(inode); 3579 struct nfs4_accessargs args = { 3580 .fh = NFS_FH(inode), 3581 .bitmask = server->cache_consistency_bitmask, 3582 }; 3583 struct nfs4_accessres res = { 3584 .server = server, 3585 }; 3586 struct rpc_message msg = { 3587 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 3588 .rpc_argp = &args, 3589 .rpc_resp = &res, 3590 .rpc_cred = entry->cred, 3591 }; 3592 int mode = entry->mask; 3593 int status = 0; 3594 3595 /* 3596 * Determine which access bits we want to ask for... 3597 */ 3598 if (mode & MAY_READ) 3599 args.access |= NFS4_ACCESS_READ; 3600 if (S_ISDIR(inode->i_mode)) { 3601 if (mode & MAY_WRITE) 3602 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 3603 if (mode & MAY_EXEC) 3604 args.access |= NFS4_ACCESS_LOOKUP; 3605 } else { 3606 if (mode & MAY_WRITE) 3607 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 3608 if (mode & MAY_EXEC) 3609 args.access |= NFS4_ACCESS_EXECUTE; 3610 } 3611 3612 res.fattr = nfs_alloc_fattr(); 3613 if (res.fattr == NULL) 3614 return -ENOMEM; 3615 3616 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3617 if (!status) { 3618 nfs_access_set_mask(entry, res.access); 3619 nfs_refresh_inode(inode, res.fattr); 3620 } 3621 nfs_free_fattr(res.fattr); 3622 return status; 3623 } 3624 3625 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3626 { 3627 struct nfs4_exception exception = { }; 3628 int err; 3629 do { 3630 err = _nfs4_proc_access(inode, entry); 3631 trace_nfs4_access(inode, err); 3632 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3633 &exception); 3634 } while (exception.retry); 3635 return err; 3636 } 3637 3638 /* 3639 * TODO: For the time being, we don't try to get any attributes 3640 * along with any of the zero-copy operations READ, READDIR, 3641 * READLINK, WRITE. 3642 * 3643 * In the case of the first three, we want to put the GETATTR 3644 * after the read-type operation -- this is because it is hard 3645 * to predict the length of a GETATTR response in v4, and thus 3646 * align the READ data correctly. This means that the GETATTR 3647 * may end up partially falling into the page cache, and we should 3648 * shift it into the 'tail' of the xdr_buf before processing. 3649 * To do this efficiently, we need to know the total length 3650 * of data received, which doesn't seem to be available outside 3651 * of the RPC layer. 3652 * 3653 * In the case of WRITE, we also want to put the GETATTR after 3654 * the operation -- in this case because we want to make sure 3655 * we get the post-operation mtime and size. 3656 * 3657 * Both of these changes to the XDR layer would in fact be quite 3658 * minor, but I decided to leave them for a subsequent patch. 3659 */ 3660 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 3661 unsigned int pgbase, unsigned int pglen) 3662 { 3663 struct nfs4_readlink args = { 3664 .fh = NFS_FH(inode), 3665 .pgbase = pgbase, 3666 .pglen = pglen, 3667 .pages = &page, 3668 }; 3669 struct nfs4_readlink_res res; 3670 struct rpc_message msg = { 3671 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 3672 .rpc_argp = &args, 3673 .rpc_resp = &res, 3674 }; 3675 3676 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 3677 } 3678 3679 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 3680 unsigned int pgbase, unsigned int pglen) 3681 { 3682 struct nfs4_exception exception = { }; 3683 int err; 3684 do { 3685 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 3686 trace_nfs4_readlink(inode, err); 3687 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3688 &exception); 3689 } while (exception.retry); 3690 return err; 3691 } 3692 3693 /* 3694 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 3695 */ 3696 static int 3697 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 3698 int flags) 3699 { 3700 struct nfs4_label l, *ilabel = NULL; 3701 struct nfs_open_context *ctx; 3702 struct nfs4_state *state; 3703 int status = 0; 3704 3705 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 3706 if (IS_ERR(ctx)) 3707 return PTR_ERR(ctx); 3708 3709 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 3710 3711 sattr->ia_mode &= ~current_umask(); 3712 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 3713 if (IS_ERR(state)) { 3714 status = PTR_ERR(state); 3715 goto out; 3716 } 3717 out: 3718 nfs4_label_release_security(ilabel); 3719 put_nfs_open_context(ctx); 3720 return status; 3721 } 3722 3723 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 3724 { 3725 struct nfs_server *server = NFS_SERVER(dir); 3726 struct nfs_removeargs args = { 3727 .fh = NFS_FH(dir), 3728 .name = *name, 3729 }; 3730 struct nfs_removeres res = { 3731 .server = server, 3732 }; 3733 struct rpc_message msg = { 3734 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 3735 .rpc_argp = &args, 3736 .rpc_resp = &res, 3737 }; 3738 int status; 3739 3740 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 3741 if (status == 0) 3742 update_changeattr(dir, &res.cinfo); 3743 return status; 3744 } 3745 3746 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 3747 { 3748 struct nfs4_exception exception = { }; 3749 int err; 3750 do { 3751 err = _nfs4_proc_remove(dir, name); 3752 trace_nfs4_remove(dir, name, err); 3753 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3754 &exception); 3755 } while (exception.retry); 3756 return err; 3757 } 3758 3759 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 3760 { 3761 struct nfs_server *server = NFS_SERVER(dir); 3762 struct nfs_removeargs *args = msg->rpc_argp; 3763 struct nfs_removeres *res = msg->rpc_resp; 3764 3765 res->server = server; 3766 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 3767 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 3768 3769 nfs_fattr_init(res->dir_attr); 3770 } 3771 3772 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 3773 { 3774 nfs4_setup_sequence(NFS_SERVER(data->dir), 3775 &data->args.seq_args, 3776 &data->res.seq_res, 3777 task); 3778 } 3779 3780 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 3781 { 3782 struct nfs_unlinkdata *data = task->tk_calldata; 3783 struct nfs_removeres *res = &data->res; 3784 3785 if (!nfs4_sequence_done(task, &res->seq_res)) 3786 return 0; 3787 if (nfs4_async_handle_error(task, res->server, NULL, 3788 &data->timeout) == -EAGAIN) 3789 return 0; 3790 update_changeattr(dir, &res->cinfo); 3791 return 1; 3792 } 3793 3794 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 3795 { 3796 struct nfs_server *server = NFS_SERVER(dir); 3797 struct nfs_renameargs *arg = msg->rpc_argp; 3798 struct nfs_renameres *res = msg->rpc_resp; 3799 3800 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 3801 res->server = server; 3802 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 3803 } 3804 3805 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 3806 { 3807 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 3808 &data->args.seq_args, 3809 &data->res.seq_res, 3810 task); 3811 } 3812 3813 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 3814 struct inode *new_dir) 3815 { 3816 struct nfs_renamedata *data = task->tk_calldata; 3817 struct nfs_renameres *res = &data->res; 3818 3819 if (!nfs4_sequence_done(task, &res->seq_res)) 3820 return 0; 3821 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 3822 return 0; 3823 3824 update_changeattr(old_dir, &res->old_cinfo); 3825 update_changeattr(new_dir, &res->new_cinfo); 3826 return 1; 3827 } 3828 3829 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3830 { 3831 struct nfs_server *server = NFS_SERVER(inode); 3832 struct nfs4_link_arg arg = { 3833 .fh = NFS_FH(inode), 3834 .dir_fh = NFS_FH(dir), 3835 .name = name, 3836 .bitmask = server->attr_bitmask, 3837 }; 3838 struct nfs4_link_res res = { 3839 .server = server, 3840 .label = NULL, 3841 }; 3842 struct rpc_message msg = { 3843 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3844 .rpc_argp = &arg, 3845 .rpc_resp = &res, 3846 }; 3847 int status = -ENOMEM; 3848 3849 res.fattr = nfs_alloc_fattr(); 3850 if (res.fattr == NULL) 3851 goto out; 3852 3853 res.label = nfs4_label_alloc(server, GFP_KERNEL); 3854 if (IS_ERR(res.label)) { 3855 status = PTR_ERR(res.label); 3856 goto out; 3857 } 3858 arg.bitmask = nfs4_bitmask(server, res.label); 3859 3860 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3861 if (!status) { 3862 update_changeattr(dir, &res.cinfo); 3863 status = nfs_post_op_update_inode(inode, res.fattr); 3864 if (!status) 3865 nfs_setsecurity(inode, res.fattr, res.label); 3866 } 3867 3868 3869 nfs4_label_free(res.label); 3870 3871 out: 3872 nfs_free_fattr(res.fattr); 3873 return status; 3874 } 3875 3876 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3877 { 3878 struct nfs4_exception exception = { }; 3879 int err; 3880 do { 3881 err = nfs4_handle_exception(NFS_SERVER(inode), 3882 _nfs4_proc_link(inode, dir, name), 3883 &exception); 3884 } while (exception.retry); 3885 return err; 3886 } 3887 3888 struct nfs4_createdata { 3889 struct rpc_message msg; 3890 struct nfs4_create_arg arg; 3891 struct nfs4_create_res res; 3892 struct nfs_fh fh; 3893 struct nfs_fattr fattr; 3894 struct nfs4_label *label; 3895 }; 3896 3897 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3898 struct qstr *name, struct iattr *sattr, u32 ftype) 3899 { 3900 struct nfs4_createdata *data; 3901 3902 data = kzalloc(sizeof(*data), GFP_KERNEL); 3903 if (data != NULL) { 3904 struct nfs_server *server = NFS_SERVER(dir); 3905 3906 data->label = nfs4_label_alloc(server, GFP_KERNEL); 3907 if (IS_ERR(data->label)) 3908 goto out_free; 3909 3910 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3911 data->msg.rpc_argp = &data->arg; 3912 data->msg.rpc_resp = &data->res; 3913 data->arg.dir_fh = NFS_FH(dir); 3914 data->arg.server = server; 3915 data->arg.name = name; 3916 data->arg.attrs = sattr; 3917 data->arg.ftype = ftype; 3918 data->arg.bitmask = nfs4_bitmask(server, data->label); 3919 data->res.server = server; 3920 data->res.fh = &data->fh; 3921 data->res.fattr = &data->fattr; 3922 data->res.label = data->label; 3923 nfs_fattr_init(data->res.fattr); 3924 } 3925 return data; 3926 out_free: 3927 kfree(data); 3928 return NULL; 3929 } 3930 3931 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3932 { 3933 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3934 &data->arg.seq_args, &data->res.seq_res, 1); 3935 if (status == 0) { 3936 update_changeattr(dir, &data->res.dir_cinfo); 3937 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 3938 } 3939 return status; 3940 } 3941 3942 static void nfs4_free_createdata(struct nfs4_createdata *data) 3943 { 3944 nfs4_label_free(data->label); 3945 kfree(data); 3946 } 3947 3948 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3949 struct page *page, unsigned int len, struct iattr *sattr, 3950 struct nfs4_label *label) 3951 { 3952 struct nfs4_createdata *data; 3953 int status = -ENAMETOOLONG; 3954 3955 if (len > NFS4_MAXPATHLEN) 3956 goto out; 3957 3958 status = -ENOMEM; 3959 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3960 if (data == NULL) 3961 goto out; 3962 3963 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3964 data->arg.u.symlink.pages = &page; 3965 data->arg.u.symlink.len = len; 3966 data->arg.label = label; 3967 3968 status = nfs4_do_create(dir, dentry, data); 3969 3970 nfs4_free_createdata(data); 3971 out: 3972 return status; 3973 } 3974 3975 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3976 struct page *page, unsigned int len, struct iattr *sattr) 3977 { 3978 struct nfs4_exception exception = { }; 3979 struct nfs4_label l, *label = NULL; 3980 int err; 3981 3982 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3983 3984 do { 3985 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 3986 trace_nfs4_symlink(dir, &dentry->d_name, err); 3987 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3988 &exception); 3989 } while (exception.retry); 3990 3991 nfs4_label_release_security(label); 3992 return err; 3993 } 3994 3995 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3996 struct iattr *sattr, struct nfs4_label *label) 3997 { 3998 struct nfs4_createdata *data; 3999 int status = -ENOMEM; 4000 4001 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 4002 if (data == NULL) 4003 goto out; 4004 4005 data->arg.label = label; 4006 status = nfs4_do_create(dir, dentry, data); 4007 4008 nfs4_free_createdata(data); 4009 out: 4010 return status; 4011 } 4012 4013 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 4014 struct iattr *sattr) 4015 { 4016 struct nfs4_exception exception = { }; 4017 struct nfs4_label l, *label = NULL; 4018 int err; 4019 4020 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4021 4022 sattr->ia_mode &= ~current_umask(); 4023 do { 4024 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 4025 trace_nfs4_mkdir(dir, &dentry->d_name, err); 4026 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4027 &exception); 4028 } while (exception.retry); 4029 nfs4_label_release_security(label); 4030 4031 return err; 4032 } 4033 4034 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4035 u64 cookie, struct page **pages, unsigned int count, int plus) 4036 { 4037 struct inode *dir = d_inode(dentry); 4038 struct nfs4_readdir_arg args = { 4039 .fh = NFS_FH(dir), 4040 .pages = pages, 4041 .pgbase = 0, 4042 .count = count, 4043 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask, 4044 .plus = plus, 4045 }; 4046 struct nfs4_readdir_res res; 4047 struct rpc_message msg = { 4048 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 4049 .rpc_argp = &args, 4050 .rpc_resp = &res, 4051 .rpc_cred = cred, 4052 }; 4053 int status; 4054 4055 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 4056 dentry, 4057 (unsigned long long)cookie); 4058 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 4059 res.pgbase = args.pgbase; 4060 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 4061 if (status >= 0) { 4062 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 4063 status += args.pgbase; 4064 } 4065 4066 nfs_invalidate_atime(dir); 4067 4068 dprintk("%s: returns %d\n", __func__, status); 4069 return status; 4070 } 4071 4072 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 4073 u64 cookie, struct page **pages, unsigned int count, int plus) 4074 { 4075 struct nfs4_exception exception = { }; 4076 int err; 4077 do { 4078 err = _nfs4_proc_readdir(dentry, cred, cookie, 4079 pages, count, plus); 4080 trace_nfs4_readdir(d_inode(dentry), err); 4081 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err, 4082 &exception); 4083 } while (exception.retry); 4084 return err; 4085 } 4086 4087 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4088 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 4089 { 4090 struct nfs4_createdata *data; 4091 int mode = sattr->ia_mode; 4092 int status = -ENOMEM; 4093 4094 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 4095 if (data == NULL) 4096 goto out; 4097 4098 if (S_ISFIFO(mode)) 4099 data->arg.ftype = NF4FIFO; 4100 else if (S_ISBLK(mode)) { 4101 data->arg.ftype = NF4BLK; 4102 data->arg.u.device.specdata1 = MAJOR(rdev); 4103 data->arg.u.device.specdata2 = MINOR(rdev); 4104 } 4105 else if (S_ISCHR(mode)) { 4106 data->arg.ftype = NF4CHR; 4107 data->arg.u.device.specdata1 = MAJOR(rdev); 4108 data->arg.u.device.specdata2 = MINOR(rdev); 4109 } else if (!S_ISSOCK(mode)) { 4110 status = -EINVAL; 4111 goto out_free; 4112 } 4113 4114 data->arg.label = label; 4115 status = nfs4_do_create(dir, dentry, data); 4116 out_free: 4117 nfs4_free_createdata(data); 4118 out: 4119 return status; 4120 } 4121 4122 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 4123 struct iattr *sattr, dev_t rdev) 4124 { 4125 struct nfs4_exception exception = { }; 4126 struct nfs4_label l, *label = NULL; 4127 int err; 4128 4129 label = nfs4_label_init_security(dir, dentry, sattr, &l); 4130 4131 sattr->ia_mode &= ~current_umask(); 4132 do { 4133 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 4134 trace_nfs4_mknod(dir, &dentry->d_name, err); 4135 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4136 &exception); 4137 } while (exception.retry); 4138 4139 nfs4_label_release_security(label); 4140 4141 return err; 4142 } 4143 4144 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 4145 struct nfs_fsstat *fsstat) 4146 { 4147 struct nfs4_statfs_arg args = { 4148 .fh = fhandle, 4149 .bitmask = server->attr_bitmask, 4150 }; 4151 struct nfs4_statfs_res res = { 4152 .fsstat = fsstat, 4153 }; 4154 struct rpc_message msg = { 4155 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 4156 .rpc_argp = &args, 4157 .rpc_resp = &res, 4158 }; 4159 4160 nfs_fattr_init(fsstat->fattr); 4161 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4162 } 4163 4164 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 4165 { 4166 struct nfs4_exception exception = { }; 4167 int err; 4168 do { 4169 err = nfs4_handle_exception(server, 4170 _nfs4_proc_statfs(server, fhandle, fsstat), 4171 &exception); 4172 } while (exception.retry); 4173 return err; 4174 } 4175 4176 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 4177 struct nfs_fsinfo *fsinfo) 4178 { 4179 struct nfs4_fsinfo_arg args = { 4180 .fh = fhandle, 4181 .bitmask = server->attr_bitmask, 4182 }; 4183 struct nfs4_fsinfo_res res = { 4184 .fsinfo = fsinfo, 4185 }; 4186 struct rpc_message msg = { 4187 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 4188 .rpc_argp = &args, 4189 .rpc_resp = &res, 4190 }; 4191 4192 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4193 } 4194 4195 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4196 { 4197 struct nfs4_exception exception = { }; 4198 unsigned long now = jiffies; 4199 int err; 4200 4201 do { 4202 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4203 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4204 if (err == 0) { 4205 struct nfs_client *clp = server->nfs_client; 4206 4207 spin_lock(&clp->cl_lock); 4208 clp->cl_lease_time = fsinfo->lease_time * HZ; 4209 clp->cl_last_renewal = now; 4210 spin_unlock(&clp->cl_lock); 4211 break; 4212 } 4213 err = nfs4_handle_exception(server, err, &exception); 4214 } while (exception.retry); 4215 return err; 4216 } 4217 4218 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4219 { 4220 int error; 4221 4222 nfs_fattr_init(fsinfo->fattr); 4223 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4224 if (error == 0) { 4225 /* block layout checks this! */ 4226 server->pnfs_blksize = fsinfo->blksize; 4227 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 4228 } 4229 4230 return error; 4231 } 4232 4233 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4234 struct nfs_pathconf *pathconf) 4235 { 4236 struct nfs4_pathconf_arg args = { 4237 .fh = fhandle, 4238 .bitmask = server->attr_bitmask, 4239 }; 4240 struct nfs4_pathconf_res res = { 4241 .pathconf = pathconf, 4242 }; 4243 struct rpc_message msg = { 4244 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4245 .rpc_argp = &args, 4246 .rpc_resp = &res, 4247 }; 4248 4249 /* None of the pathconf attributes are mandatory to implement */ 4250 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4251 memset(pathconf, 0, sizeof(*pathconf)); 4252 return 0; 4253 } 4254 4255 nfs_fattr_init(pathconf->fattr); 4256 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4257 } 4258 4259 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4260 struct nfs_pathconf *pathconf) 4261 { 4262 struct nfs4_exception exception = { }; 4263 int err; 4264 4265 do { 4266 err = nfs4_handle_exception(server, 4267 _nfs4_proc_pathconf(server, fhandle, pathconf), 4268 &exception); 4269 } while (exception.retry); 4270 return err; 4271 } 4272 4273 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4274 const struct nfs_open_context *ctx, 4275 const struct nfs_lock_context *l_ctx, 4276 fmode_t fmode) 4277 { 4278 const struct nfs_lockowner *lockowner = NULL; 4279 4280 if (l_ctx != NULL) 4281 lockowner = &l_ctx->lockowner; 4282 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner); 4283 } 4284 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4285 4286 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4287 const struct nfs_open_context *ctx, 4288 const struct nfs_lock_context *l_ctx, 4289 fmode_t fmode) 4290 { 4291 nfs4_stateid current_stateid; 4292 4293 /* If the current stateid represents a lost lock, then exit */ 4294 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4295 return true; 4296 return nfs4_stateid_match(stateid, ¤t_stateid); 4297 } 4298 4299 static bool nfs4_error_stateid_expired(int err) 4300 { 4301 switch (err) { 4302 case -NFS4ERR_DELEG_REVOKED: 4303 case -NFS4ERR_ADMIN_REVOKED: 4304 case -NFS4ERR_BAD_STATEID: 4305 case -NFS4ERR_STALE_STATEID: 4306 case -NFS4ERR_OLD_STATEID: 4307 case -NFS4ERR_OPENMODE: 4308 case -NFS4ERR_EXPIRED: 4309 return true; 4310 } 4311 return false; 4312 } 4313 4314 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr) 4315 { 4316 nfs_invalidate_atime(hdr->inode); 4317 } 4318 4319 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4320 { 4321 struct nfs_server *server = NFS_SERVER(hdr->inode); 4322 4323 trace_nfs4_read(hdr, task->tk_status); 4324 if (nfs4_async_handle_error(task, server, 4325 hdr->args.context->state, 4326 NULL) == -EAGAIN) { 4327 rpc_restart_call_prepare(task); 4328 return -EAGAIN; 4329 } 4330 4331 __nfs4_read_done_cb(hdr); 4332 if (task->tk_status > 0) 4333 renew_lease(server, hdr->timestamp); 4334 return 0; 4335 } 4336 4337 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4338 struct nfs_pgio_args *args) 4339 { 4340 4341 if (!nfs4_error_stateid_expired(task->tk_status) || 4342 nfs4_stateid_is_current(&args->stateid, 4343 args->context, 4344 args->lock_context, 4345 FMODE_READ)) 4346 return false; 4347 rpc_restart_call_prepare(task); 4348 return true; 4349 } 4350 4351 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4352 { 4353 4354 dprintk("--> %s\n", __func__); 4355 4356 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4357 return -EAGAIN; 4358 if (nfs4_read_stateid_changed(task, &hdr->args)) 4359 return -EAGAIN; 4360 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4361 nfs4_read_done_cb(task, hdr); 4362 } 4363 4364 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4365 struct rpc_message *msg) 4366 { 4367 hdr->timestamp = jiffies; 4368 hdr->pgio_done_cb = nfs4_read_done_cb; 4369 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4370 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); 4371 } 4372 4373 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4374 struct nfs_pgio_header *hdr) 4375 { 4376 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode), 4377 &hdr->args.seq_args, 4378 &hdr->res.seq_res, 4379 task)) 4380 return 0; 4381 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4382 hdr->args.lock_context, 4383 hdr->rw_ops->rw_mode) == -EIO) 4384 return -EIO; 4385 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4386 return -EIO; 4387 return 0; 4388 } 4389 4390 static int nfs4_write_done_cb(struct rpc_task *task, 4391 struct nfs_pgio_header *hdr) 4392 { 4393 struct inode *inode = hdr->inode; 4394 4395 trace_nfs4_write(hdr, task->tk_status); 4396 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4397 hdr->args.context->state, 4398 NULL) == -EAGAIN) { 4399 rpc_restart_call_prepare(task); 4400 return -EAGAIN; 4401 } 4402 if (task->tk_status >= 0) { 4403 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4404 nfs_writeback_update_inode(hdr); 4405 } 4406 return 0; 4407 } 4408 4409 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4410 struct nfs_pgio_args *args) 4411 { 4412 4413 if (!nfs4_error_stateid_expired(task->tk_status) || 4414 nfs4_stateid_is_current(&args->stateid, 4415 args->context, 4416 args->lock_context, 4417 FMODE_WRITE)) 4418 return false; 4419 rpc_restart_call_prepare(task); 4420 return true; 4421 } 4422 4423 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4424 { 4425 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4426 return -EAGAIN; 4427 if (nfs4_write_stateid_changed(task, &hdr->args)) 4428 return -EAGAIN; 4429 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4430 nfs4_write_done_cb(task, hdr); 4431 } 4432 4433 static 4434 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4435 { 4436 /* Don't request attributes for pNFS or O_DIRECT writes */ 4437 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4438 return false; 4439 /* Otherwise, request attributes if and only if we don't hold 4440 * a delegation 4441 */ 4442 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4443 } 4444 4445 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4446 struct rpc_message *msg) 4447 { 4448 struct nfs_server *server = NFS_SERVER(hdr->inode); 4449 4450 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4451 hdr->args.bitmask = NULL; 4452 hdr->res.fattr = NULL; 4453 } else 4454 hdr->args.bitmask = server->cache_consistency_bitmask; 4455 4456 if (!hdr->pgio_done_cb) 4457 hdr->pgio_done_cb = nfs4_write_done_cb; 4458 hdr->res.server = server; 4459 hdr->timestamp = jiffies; 4460 4461 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4462 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1); 4463 } 4464 4465 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4466 { 4467 nfs4_setup_sequence(NFS_SERVER(data->inode), 4468 &data->args.seq_args, 4469 &data->res.seq_res, 4470 task); 4471 } 4472 4473 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4474 { 4475 struct inode *inode = data->inode; 4476 4477 trace_nfs4_commit(data, task->tk_status); 4478 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4479 NULL, NULL) == -EAGAIN) { 4480 rpc_restart_call_prepare(task); 4481 return -EAGAIN; 4482 } 4483 return 0; 4484 } 4485 4486 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4487 { 4488 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4489 return -EAGAIN; 4490 return data->commit_done_cb(task, data); 4491 } 4492 4493 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4494 { 4495 struct nfs_server *server = NFS_SERVER(data->inode); 4496 4497 if (data->commit_done_cb == NULL) 4498 data->commit_done_cb = nfs4_commit_done_cb; 4499 data->res.server = server; 4500 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4501 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4502 } 4503 4504 struct nfs4_renewdata { 4505 struct nfs_client *client; 4506 unsigned long timestamp; 4507 }; 4508 4509 /* 4510 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4511 * standalone procedure for queueing an asynchronous RENEW. 4512 */ 4513 static void nfs4_renew_release(void *calldata) 4514 { 4515 struct nfs4_renewdata *data = calldata; 4516 struct nfs_client *clp = data->client; 4517 4518 if (atomic_read(&clp->cl_count) > 1) 4519 nfs4_schedule_state_renewal(clp); 4520 nfs_put_client(clp); 4521 kfree(data); 4522 } 4523 4524 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4525 { 4526 struct nfs4_renewdata *data = calldata; 4527 struct nfs_client *clp = data->client; 4528 unsigned long timestamp = data->timestamp; 4529 4530 trace_nfs4_renew_async(clp, task->tk_status); 4531 switch (task->tk_status) { 4532 case 0: 4533 break; 4534 case -NFS4ERR_LEASE_MOVED: 4535 nfs4_schedule_lease_moved_recovery(clp); 4536 break; 4537 default: 4538 /* Unless we're shutting down, schedule state recovery! */ 4539 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 4540 return; 4541 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 4542 nfs4_schedule_lease_recovery(clp); 4543 return; 4544 } 4545 nfs4_schedule_path_down_recovery(clp); 4546 } 4547 do_renew_lease(clp, timestamp); 4548 } 4549 4550 static const struct rpc_call_ops nfs4_renew_ops = { 4551 .rpc_call_done = nfs4_renew_done, 4552 .rpc_release = nfs4_renew_release, 4553 }; 4554 4555 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 4556 { 4557 struct rpc_message msg = { 4558 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4559 .rpc_argp = clp, 4560 .rpc_cred = cred, 4561 }; 4562 struct nfs4_renewdata *data; 4563 4564 if (renew_flags == 0) 4565 return 0; 4566 if (!atomic_inc_not_zero(&clp->cl_count)) 4567 return -EIO; 4568 data = kmalloc(sizeof(*data), GFP_NOFS); 4569 if (data == NULL) 4570 return -ENOMEM; 4571 data->client = clp; 4572 data->timestamp = jiffies; 4573 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 4574 &nfs4_renew_ops, data); 4575 } 4576 4577 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 4578 { 4579 struct rpc_message msg = { 4580 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4581 .rpc_argp = clp, 4582 .rpc_cred = cred, 4583 }; 4584 unsigned long now = jiffies; 4585 int status; 4586 4587 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4588 if (status < 0) 4589 return status; 4590 do_renew_lease(clp, now); 4591 return 0; 4592 } 4593 4594 static inline int nfs4_server_supports_acls(struct nfs_server *server) 4595 { 4596 return server->caps & NFS_CAP_ACLS; 4597 } 4598 4599 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 4600 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 4601 * the stack. 4602 */ 4603 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 4604 4605 static int buf_to_pages_noslab(const void *buf, size_t buflen, 4606 struct page **pages) 4607 { 4608 struct page *newpage, **spages; 4609 int rc = 0; 4610 size_t len; 4611 spages = pages; 4612 4613 do { 4614 len = min_t(size_t, PAGE_SIZE, buflen); 4615 newpage = alloc_page(GFP_KERNEL); 4616 4617 if (newpage == NULL) 4618 goto unwind; 4619 memcpy(page_address(newpage), buf, len); 4620 buf += len; 4621 buflen -= len; 4622 *pages++ = newpage; 4623 rc++; 4624 } while (buflen != 0); 4625 4626 return rc; 4627 4628 unwind: 4629 for(; rc > 0; rc--) 4630 __free_page(spages[rc-1]); 4631 return -ENOMEM; 4632 } 4633 4634 struct nfs4_cached_acl { 4635 int cached; 4636 size_t len; 4637 char data[0]; 4638 }; 4639 4640 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 4641 { 4642 struct nfs_inode *nfsi = NFS_I(inode); 4643 4644 spin_lock(&inode->i_lock); 4645 kfree(nfsi->nfs4_acl); 4646 nfsi->nfs4_acl = acl; 4647 spin_unlock(&inode->i_lock); 4648 } 4649 4650 static void nfs4_zap_acl_attr(struct inode *inode) 4651 { 4652 nfs4_set_cached_acl(inode, NULL); 4653 } 4654 4655 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 4656 { 4657 struct nfs_inode *nfsi = NFS_I(inode); 4658 struct nfs4_cached_acl *acl; 4659 int ret = -ENOENT; 4660 4661 spin_lock(&inode->i_lock); 4662 acl = nfsi->nfs4_acl; 4663 if (acl == NULL) 4664 goto out; 4665 if (buf == NULL) /* user is just asking for length */ 4666 goto out_len; 4667 if (acl->cached == 0) 4668 goto out; 4669 ret = -ERANGE; /* see getxattr(2) man page */ 4670 if (acl->len > buflen) 4671 goto out; 4672 memcpy(buf, acl->data, acl->len); 4673 out_len: 4674 ret = acl->len; 4675 out: 4676 spin_unlock(&inode->i_lock); 4677 return ret; 4678 } 4679 4680 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 4681 { 4682 struct nfs4_cached_acl *acl; 4683 size_t buflen = sizeof(*acl) + acl_len; 4684 4685 if (buflen <= PAGE_SIZE) { 4686 acl = kmalloc(buflen, GFP_KERNEL); 4687 if (acl == NULL) 4688 goto out; 4689 acl->cached = 1; 4690 _copy_from_pages(acl->data, pages, pgbase, acl_len); 4691 } else { 4692 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 4693 if (acl == NULL) 4694 goto out; 4695 acl->cached = 0; 4696 } 4697 acl->len = acl_len; 4698 out: 4699 nfs4_set_cached_acl(inode, acl); 4700 } 4701 4702 /* 4703 * The getxattr API returns the required buffer length when called with a 4704 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 4705 * the required buf. On a NULL buf, we send a page of data to the server 4706 * guessing that the ACL request can be serviced by a page. If so, we cache 4707 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 4708 * the cache. If not so, we throw away the page, and cache the required 4709 * length. The next getxattr call will then produce another round trip to 4710 * the server, this time with the input buf of the required size. 4711 */ 4712 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4713 { 4714 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 4715 struct nfs_getaclargs args = { 4716 .fh = NFS_FH(inode), 4717 .acl_pages = pages, 4718 .acl_len = buflen, 4719 }; 4720 struct nfs_getaclres res = { 4721 .acl_len = buflen, 4722 }; 4723 struct rpc_message msg = { 4724 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 4725 .rpc_argp = &args, 4726 .rpc_resp = &res, 4727 }; 4728 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4729 int ret = -ENOMEM, i; 4730 4731 /* As long as we're doing a round trip to the server anyway, 4732 * let's be prepared for a page of acl data. */ 4733 if (npages == 0) 4734 npages = 1; 4735 if (npages > ARRAY_SIZE(pages)) 4736 return -ERANGE; 4737 4738 for (i = 0; i < npages; i++) { 4739 pages[i] = alloc_page(GFP_KERNEL); 4740 if (!pages[i]) 4741 goto out_free; 4742 } 4743 4744 /* for decoding across pages */ 4745 res.acl_scratch = alloc_page(GFP_KERNEL); 4746 if (!res.acl_scratch) 4747 goto out_free; 4748 4749 args.acl_len = npages * PAGE_SIZE; 4750 4751 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 4752 __func__, buf, buflen, npages, args.acl_len); 4753 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 4754 &msg, &args.seq_args, &res.seq_res, 0); 4755 if (ret) 4756 goto out_free; 4757 4758 /* Handle the case where the passed-in buffer is too short */ 4759 if (res.acl_flags & NFS4_ACL_TRUNC) { 4760 /* Did the user only issue a request for the acl length? */ 4761 if (buf == NULL) 4762 goto out_ok; 4763 ret = -ERANGE; 4764 goto out_free; 4765 } 4766 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 4767 if (buf) { 4768 if (res.acl_len > buflen) { 4769 ret = -ERANGE; 4770 goto out_free; 4771 } 4772 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 4773 } 4774 out_ok: 4775 ret = res.acl_len; 4776 out_free: 4777 for (i = 0; i < npages; i++) 4778 if (pages[i]) 4779 __free_page(pages[i]); 4780 if (res.acl_scratch) 4781 __free_page(res.acl_scratch); 4782 return ret; 4783 } 4784 4785 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4786 { 4787 struct nfs4_exception exception = { }; 4788 ssize_t ret; 4789 do { 4790 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 4791 trace_nfs4_get_acl(inode, ret); 4792 if (ret >= 0) 4793 break; 4794 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 4795 } while (exception.retry); 4796 return ret; 4797 } 4798 4799 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 4800 { 4801 struct nfs_server *server = NFS_SERVER(inode); 4802 int ret; 4803 4804 if (!nfs4_server_supports_acls(server)) 4805 return -EOPNOTSUPP; 4806 ret = nfs_revalidate_inode(server, inode); 4807 if (ret < 0) 4808 return ret; 4809 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 4810 nfs_zap_acl_cache(inode); 4811 ret = nfs4_read_cached_acl(inode, buf, buflen); 4812 if (ret != -ENOENT) 4813 /* -ENOENT is returned if there is no ACL or if there is an ACL 4814 * but no cached acl data, just the acl length */ 4815 return ret; 4816 return nfs4_get_acl_uncached(inode, buf, buflen); 4817 } 4818 4819 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4820 { 4821 struct nfs_server *server = NFS_SERVER(inode); 4822 struct page *pages[NFS4ACL_MAXPAGES]; 4823 struct nfs_setaclargs arg = { 4824 .fh = NFS_FH(inode), 4825 .acl_pages = pages, 4826 .acl_len = buflen, 4827 }; 4828 struct nfs_setaclres res; 4829 struct rpc_message msg = { 4830 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 4831 .rpc_argp = &arg, 4832 .rpc_resp = &res, 4833 }; 4834 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4835 int ret, i; 4836 4837 if (!nfs4_server_supports_acls(server)) 4838 return -EOPNOTSUPP; 4839 if (npages > ARRAY_SIZE(pages)) 4840 return -ERANGE; 4841 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages); 4842 if (i < 0) 4843 return i; 4844 nfs4_inode_return_delegation(inode); 4845 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4846 4847 /* 4848 * Free each page after tx, so the only ref left is 4849 * held by the network stack 4850 */ 4851 for (; i > 0; i--) 4852 put_page(pages[i-1]); 4853 4854 /* 4855 * Acl update can result in inode attribute update. 4856 * so mark the attribute cache invalid. 4857 */ 4858 spin_lock(&inode->i_lock); 4859 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 4860 spin_unlock(&inode->i_lock); 4861 nfs_access_zap_cache(inode); 4862 nfs_zap_acl_cache(inode); 4863 return ret; 4864 } 4865 4866 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4867 { 4868 struct nfs4_exception exception = { }; 4869 int err; 4870 do { 4871 err = __nfs4_proc_set_acl(inode, buf, buflen); 4872 trace_nfs4_set_acl(inode, err); 4873 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4874 &exception); 4875 } while (exception.retry); 4876 return err; 4877 } 4878 4879 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 4880 static int _nfs4_get_security_label(struct inode *inode, void *buf, 4881 size_t buflen) 4882 { 4883 struct nfs_server *server = NFS_SERVER(inode); 4884 struct nfs_fattr fattr; 4885 struct nfs4_label label = {0, 0, buflen, buf}; 4886 4887 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4888 struct nfs4_getattr_arg arg = { 4889 .fh = NFS_FH(inode), 4890 .bitmask = bitmask, 4891 }; 4892 struct nfs4_getattr_res res = { 4893 .fattr = &fattr, 4894 .label = &label, 4895 .server = server, 4896 }; 4897 struct rpc_message msg = { 4898 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4899 .rpc_argp = &arg, 4900 .rpc_resp = &res, 4901 }; 4902 int ret; 4903 4904 nfs_fattr_init(&fattr); 4905 4906 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 4907 if (ret) 4908 return ret; 4909 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 4910 return -ENOENT; 4911 if (buflen < label.len) 4912 return -ERANGE; 4913 return 0; 4914 } 4915 4916 static int nfs4_get_security_label(struct inode *inode, void *buf, 4917 size_t buflen) 4918 { 4919 struct nfs4_exception exception = { }; 4920 int err; 4921 4922 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4923 return -EOPNOTSUPP; 4924 4925 do { 4926 err = _nfs4_get_security_label(inode, buf, buflen); 4927 trace_nfs4_get_security_label(inode, err); 4928 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4929 &exception); 4930 } while (exception.retry); 4931 return err; 4932 } 4933 4934 static int _nfs4_do_set_security_label(struct inode *inode, 4935 struct nfs4_label *ilabel, 4936 struct nfs_fattr *fattr, 4937 struct nfs4_label *olabel) 4938 { 4939 4940 struct iattr sattr = {0}; 4941 struct nfs_server *server = NFS_SERVER(inode); 4942 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4943 struct nfs_setattrargs arg = { 4944 .fh = NFS_FH(inode), 4945 .iap = &sattr, 4946 .server = server, 4947 .bitmask = bitmask, 4948 .label = ilabel, 4949 }; 4950 struct nfs_setattrres res = { 4951 .fattr = fattr, 4952 .label = olabel, 4953 .server = server, 4954 }; 4955 struct rpc_message msg = { 4956 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 4957 .rpc_argp = &arg, 4958 .rpc_resp = &res, 4959 }; 4960 int status; 4961 4962 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 4963 4964 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4965 if (status) 4966 dprintk("%s failed: %d\n", __func__, status); 4967 4968 return status; 4969 } 4970 4971 static int nfs4_do_set_security_label(struct inode *inode, 4972 struct nfs4_label *ilabel, 4973 struct nfs_fattr *fattr, 4974 struct nfs4_label *olabel) 4975 { 4976 struct nfs4_exception exception = { }; 4977 int err; 4978 4979 do { 4980 err = _nfs4_do_set_security_label(inode, ilabel, 4981 fattr, olabel); 4982 trace_nfs4_set_security_label(inode, err); 4983 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4984 &exception); 4985 } while (exception.retry); 4986 return err; 4987 } 4988 4989 static int 4990 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen) 4991 { 4992 struct nfs4_label ilabel, *olabel = NULL; 4993 struct nfs_fattr fattr; 4994 struct rpc_cred *cred; 4995 struct inode *inode = d_inode(dentry); 4996 int status; 4997 4998 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4999 return -EOPNOTSUPP; 5000 5001 nfs_fattr_init(&fattr); 5002 5003 ilabel.pi = 0; 5004 ilabel.lfs = 0; 5005 ilabel.label = (char *)buf; 5006 ilabel.len = buflen; 5007 5008 cred = rpc_lookup_cred(); 5009 if (IS_ERR(cred)) 5010 return PTR_ERR(cred); 5011 5012 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 5013 if (IS_ERR(olabel)) { 5014 status = -PTR_ERR(olabel); 5015 goto out; 5016 } 5017 5018 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 5019 if (status == 0) 5020 nfs_setsecurity(inode, &fattr, olabel); 5021 5022 nfs4_label_free(olabel); 5023 out: 5024 put_rpccred(cred); 5025 return status; 5026 } 5027 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 5028 5029 5030 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 5031 nfs4_verifier *bootverf) 5032 { 5033 __be32 verf[2]; 5034 5035 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 5036 /* An impossible timestamp guarantees this value 5037 * will never match a generated boot time. */ 5038 verf[0] = 0; 5039 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1); 5040 } else { 5041 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 5042 verf[0] = cpu_to_be32(nn->boot_time.tv_sec); 5043 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec); 5044 } 5045 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 5046 } 5047 5048 static int 5049 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 5050 { 5051 int result; 5052 size_t len; 5053 char *str; 5054 5055 if (clp->cl_owner_id != NULL) 5056 return 0; 5057 5058 rcu_read_lock(); 5059 len = 14 + strlen(clp->cl_ipaddr) + 1 + 5060 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 5061 1 + 5062 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) + 5063 1; 5064 rcu_read_unlock(); 5065 5066 if (len > NFS4_OPAQUE_LIMIT + 1) 5067 return -EINVAL; 5068 5069 /* 5070 * Since this string is allocated at mount time, and held until the 5071 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5072 * about a memory-reclaim deadlock. 5073 */ 5074 str = kmalloc(len, GFP_KERNEL); 5075 if (!str) 5076 return -ENOMEM; 5077 5078 rcu_read_lock(); 5079 result = scnprintf(str, len, "Linux NFSv4.0 %s/%s %s", 5080 clp->cl_ipaddr, 5081 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), 5082 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)); 5083 rcu_read_unlock(); 5084 5085 clp->cl_owner_id = str; 5086 return 0; 5087 } 5088 5089 static int 5090 nfs4_init_uniquifier_client_string(struct nfs_client *clp) 5091 { 5092 int result; 5093 size_t len; 5094 char *str; 5095 5096 len = 10 + 10 + 1 + 10 + 1 + 5097 strlen(nfs4_client_id_uniquifier) + 1 + 5098 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5099 5100 if (len > NFS4_OPAQUE_LIMIT + 1) 5101 return -EINVAL; 5102 5103 /* 5104 * Since this string is allocated at mount time, and held until the 5105 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5106 * about a memory-reclaim deadlock. 5107 */ 5108 str = kmalloc(len, GFP_KERNEL); 5109 if (!str) 5110 return -ENOMEM; 5111 5112 result = scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 5113 clp->rpc_ops->version, clp->cl_minorversion, 5114 nfs4_client_id_uniquifier, 5115 clp->cl_rpcclient->cl_nodename); 5116 clp->cl_owner_id = str; 5117 return 0; 5118 } 5119 5120 static int 5121 nfs4_init_uniform_client_string(struct nfs_client *clp) 5122 { 5123 int result; 5124 size_t len; 5125 char *str; 5126 5127 if (clp->cl_owner_id != NULL) 5128 return 0; 5129 5130 if (nfs4_client_id_uniquifier[0] != '\0') 5131 return nfs4_init_uniquifier_client_string(clp); 5132 5133 len = 10 + 10 + 1 + 10 + 1 + 5134 strlen(clp->cl_rpcclient->cl_nodename) + 1; 5135 5136 if (len > NFS4_OPAQUE_LIMIT + 1) 5137 return -EINVAL; 5138 5139 /* 5140 * Since this string is allocated at mount time, and held until the 5141 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 5142 * about a memory-reclaim deadlock. 5143 */ 5144 str = kmalloc(len, GFP_KERNEL); 5145 if (!str) 5146 return -ENOMEM; 5147 5148 result = scnprintf(str, len, "Linux NFSv%u.%u %s", 5149 clp->rpc_ops->version, clp->cl_minorversion, 5150 clp->cl_rpcclient->cl_nodename); 5151 clp->cl_owner_id = str; 5152 return 0; 5153 } 5154 5155 /* 5156 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 5157 * services. Advertise one based on the address family of the 5158 * clientaddr. 5159 */ 5160 static unsigned int 5161 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 5162 { 5163 if (strchr(clp->cl_ipaddr, ':') != NULL) 5164 return scnprintf(buf, len, "tcp6"); 5165 else 5166 return scnprintf(buf, len, "tcp"); 5167 } 5168 5169 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 5170 { 5171 struct nfs4_setclientid *sc = calldata; 5172 5173 if (task->tk_status == 0) 5174 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 5175 } 5176 5177 static const struct rpc_call_ops nfs4_setclientid_ops = { 5178 .rpc_call_done = nfs4_setclientid_done, 5179 }; 5180 5181 /** 5182 * nfs4_proc_setclientid - Negotiate client ID 5183 * @clp: state data structure 5184 * @program: RPC program for NFSv4 callback service 5185 * @port: IP port number for NFS4 callback service 5186 * @cred: RPC credential to use for this call 5187 * @res: where to place the result 5188 * 5189 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5190 */ 5191 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 5192 unsigned short port, struct rpc_cred *cred, 5193 struct nfs4_setclientid_res *res) 5194 { 5195 nfs4_verifier sc_verifier; 5196 struct nfs4_setclientid setclientid = { 5197 .sc_verifier = &sc_verifier, 5198 .sc_prog = program, 5199 .sc_clnt = clp, 5200 }; 5201 struct rpc_message msg = { 5202 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5203 .rpc_argp = &setclientid, 5204 .rpc_resp = res, 5205 .rpc_cred = cred, 5206 }; 5207 struct rpc_task *task; 5208 struct rpc_task_setup task_setup_data = { 5209 .rpc_client = clp->cl_rpcclient, 5210 .rpc_message = &msg, 5211 .callback_ops = &nfs4_setclientid_ops, 5212 .callback_data = &setclientid, 5213 .flags = RPC_TASK_TIMEOUT, 5214 }; 5215 int status; 5216 5217 /* nfs_client_id4 */ 5218 nfs4_init_boot_verifier(clp, &sc_verifier); 5219 5220 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5221 status = nfs4_init_uniform_client_string(clp); 5222 else 5223 status = nfs4_init_nonuniform_client_string(clp); 5224 5225 if (status) 5226 goto out; 5227 5228 /* cb_client4 */ 5229 setclientid.sc_netid_len = 5230 nfs4_init_callback_netid(clp, 5231 setclientid.sc_netid, 5232 sizeof(setclientid.sc_netid)); 5233 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5234 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5235 clp->cl_ipaddr, port >> 8, port & 255); 5236 5237 dprintk("NFS call setclientid auth=%s, '%s'\n", 5238 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5239 clp->cl_owner_id); 5240 task = rpc_run_task(&task_setup_data); 5241 if (IS_ERR(task)) { 5242 status = PTR_ERR(task); 5243 goto out; 5244 } 5245 status = task->tk_status; 5246 if (setclientid.sc_cred) { 5247 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5248 put_rpccred(setclientid.sc_cred); 5249 } 5250 rpc_put_task(task); 5251 out: 5252 trace_nfs4_setclientid(clp, status); 5253 dprintk("NFS reply setclientid: %d\n", status); 5254 return status; 5255 } 5256 5257 /** 5258 * nfs4_proc_setclientid_confirm - Confirm client ID 5259 * @clp: state data structure 5260 * @res: result of a previous SETCLIENTID 5261 * @cred: RPC credential to use for this call 5262 * 5263 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5264 */ 5265 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5266 struct nfs4_setclientid_res *arg, 5267 struct rpc_cred *cred) 5268 { 5269 struct rpc_message msg = { 5270 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5271 .rpc_argp = arg, 5272 .rpc_cred = cred, 5273 }; 5274 int status; 5275 5276 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5277 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5278 clp->cl_clientid); 5279 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5280 trace_nfs4_setclientid_confirm(clp, status); 5281 dprintk("NFS reply setclientid_confirm: %d\n", status); 5282 return status; 5283 } 5284 5285 struct nfs4_delegreturndata { 5286 struct nfs4_delegreturnargs args; 5287 struct nfs4_delegreturnres res; 5288 struct nfs_fh fh; 5289 nfs4_stateid stateid; 5290 unsigned long timestamp; 5291 struct nfs_fattr fattr; 5292 int rpc_status; 5293 struct inode *inode; 5294 bool roc; 5295 u32 roc_barrier; 5296 }; 5297 5298 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5299 { 5300 struct nfs4_delegreturndata *data = calldata; 5301 5302 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5303 return; 5304 5305 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5306 switch (task->tk_status) { 5307 case 0: 5308 renew_lease(data->res.server, data->timestamp); 5309 case -NFS4ERR_ADMIN_REVOKED: 5310 case -NFS4ERR_DELEG_REVOKED: 5311 case -NFS4ERR_BAD_STATEID: 5312 case -NFS4ERR_OLD_STATEID: 5313 case -NFS4ERR_STALE_STATEID: 5314 case -NFS4ERR_EXPIRED: 5315 task->tk_status = 0; 5316 if (data->roc) 5317 pnfs_roc_set_barrier(data->inode, data->roc_barrier); 5318 break; 5319 default: 5320 if (nfs4_async_handle_error(task, data->res.server, 5321 NULL, NULL) == -EAGAIN) { 5322 rpc_restart_call_prepare(task); 5323 return; 5324 } 5325 } 5326 data->rpc_status = task->tk_status; 5327 } 5328 5329 static void nfs4_delegreturn_release(void *calldata) 5330 { 5331 struct nfs4_delegreturndata *data = calldata; 5332 struct inode *inode = data->inode; 5333 5334 if (inode) { 5335 if (data->roc) 5336 pnfs_roc_release(inode); 5337 nfs_iput_and_deactive(inode); 5338 } 5339 kfree(calldata); 5340 } 5341 5342 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5343 { 5344 struct nfs4_delegreturndata *d_data; 5345 5346 d_data = (struct nfs4_delegreturndata *)data; 5347 5348 if (nfs4_wait_on_layoutreturn(d_data->inode, task)) 5349 return; 5350 5351 if (d_data->roc) 5352 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier); 5353 5354 nfs4_setup_sequence(d_data->res.server, 5355 &d_data->args.seq_args, 5356 &d_data->res.seq_res, 5357 task); 5358 } 5359 5360 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5361 .rpc_call_prepare = nfs4_delegreturn_prepare, 5362 .rpc_call_done = nfs4_delegreturn_done, 5363 .rpc_release = nfs4_delegreturn_release, 5364 }; 5365 5366 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5367 { 5368 struct nfs4_delegreturndata *data; 5369 struct nfs_server *server = NFS_SERVER(inode); 5370 struct rpc_task *task; 5371 struct rpc_message msg = { 5372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5373 .rpc_cred = cred, 5374 }; 5375 struct rpc_task_setup task_setup_data = { 5376 .rpc_client = server->client, 5377 .rpc_message = &msg, 5378 .callback_ops = &nfs4_delegreturn_ops, 5379 .flags = RPC_TASK_ASYNC, 5380 }; 5381 int status = 0; 5382 5383 data = kzalloc(sizeof(*data), GFP_NOFS); 5384 if (data == NULL) 5385 return -ENOMEM; 5386 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5387 data->args.fhandle = &data->fh; 5388 data->args.stateid = &data->stateid; 5389 data->args.bitmask = server->cache_consistency_bitmask; 5390 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5391 nfs4_stateid_copy(&data->stateid, stateid); 5392 data->res.fattr = &data->fattr; 5393 data->res.server = server; 5394 nfs_fattr_init(data->res.fattr); 5395 data->timestamp = jiffies; 5396 data->rpc_status = 0; 5397 data->inode = nfs_igrab_and_active(inode); 5398 if (data->inode) 5399 data->roc = nfs4_roc(inode); 5400 5401 task_setup_data.callback_data = data; 5402 msg.rpc_argp = &data->args; 5403 msg.rpc_resp = &data->res; 5404 task = rpc_run_task(&task_setup_data); 5405 if (IS_ERR(task)) 5406 return PTR_ERR(task); 5407 if (!issync) 5408 goto out; 5409 status = nfs4_wait_for_completion_rpc_task(task); 5410 if (status != 0) 5411 goto out; 5412 status = data->rpc_status; 5413 if (status == 0) 5414 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5415 else 5416 nfs_refresh_inode(inode, &data->fattr); 5417 out: 5418 rpc_put_task(task); 5419 return status; 5420 } 5421 5422 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5423 { 5424 struct nfs_server *server = NFS_SERVER(inode); 5425 struct nfs4_exception exception = { }; 5426 int err; 5427 do { 5428 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5429 trace_nfs4_delegreturn(inode, err); 5430 switch (err) { 5431 case -NFS4ERR_STALE_STATEID: 5432 case -NFS4ERR_EXPIRED: 5433 case 0: 5434 return 0; 5435 } 5436 err = nfs4_handle_exception(server, err, &exception); 5437 } while (exception.retry); 5438 return err; 5439 } 5440 5441 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 5442 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 5443 5444 /* 5445 * sleep, with exponential backoff, and retry the LOCK operation. 5446 */ 5447 static unsigned long 5448 nfs4_set_lock_task_retry(unsigned long timeout) 5449 { 5450 freezable_schedule_timeout_killable_unsafe(timeout); 5451 timeout <<= 1; 5452 if (timeout > NFS4_LOCK_MAXTIMEOUT) 5453 return NFS4_LOCK_MAXTIMEOUT; 5454 return timeout; 5455 } 5456 5457 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5458 { 5459 struct inode *inode = state->inode; 5460 struct nfs_server *server = NFS_SERVER(inode); 5461 struct nfs_client *clp = server->nfs_client; 5462 struct nfs_lockt_args arg = { 5463 .fh = NFS_FH(inode), 5464 .fl = request, 5465 }; 5466 struct nfs_lockt_res res = { 5467 .denied = request, 5468 }; 5469 struct rpc_message msg = { 5470 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5471 .rpc_argp = &arg, 5472 .rpc_resp = &res, 5473 .rpc_cred = state->owner->so_cred, 5474 }; 5475 struct nfs4_lock_state *lsp; 5476 int status; 5477 5478 arg.lock_owner.clientid = clp->cl_clientid; 5479 status = nfs4_set_lock_state(state, request); 5480 if (status != 0) 5481 goto out; 5482 lsp = request->fl_u.nfs4_fl.owner; 5483 arg.lock_owner.id = lsp->ls_seqid.owner_id; 5484 arg.lock_owner.s_dev = server->s_dev; 5485 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5486 switch (status) { 5487 case 0: 5488 request->fl_type = F_UNLCK; 5489 break; 5490 case -NFS4ERR_DENIED: 5491 status = 0; 5492 } 5493 request->fl_ops->fl_release_private(request); 5494 request->fl_ops = NULL; 5495 out: 5496 return status; 5497 } 5498 5499 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5500 { 5501 struct nfs4_exception exception = { }; 5502 int err; 5503 5504 do { 5505 err = _nfs4_proc_getlk(state, cmd, request); 5506 trace_nfs4_get_lock(request, state, cmd, err); 5507 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 5508 &exception); 5509 } while (exception.retry); 5510 return err; 5511 } 5512 5513 static int do_vfs_lock(struct inode *inode, struct file_lock *fl) 5514 { 5515 return locks_lock_inode_wait(inode, fl); 5516 } 5517 5518 struct nfs4_unlockdata { 5519 struct nfs_locku_args arg; 5520 struct nfs_locku_res res; 5521 struct nfs4_lock_state *lsp; 5522 struct nfs_open_context *ctx; 5523 struct file_lock fl; 5524 struct nfs_server *server; 5525 unsigned long timestamp; 5526 }; 5527 5528 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 5529 struct nfs_open_context *ctx, 5530 struct nfs4_lock_state *lsp, 5531 struct nfs_seqid *seqid) 5532 { 5533 struct nfs4_unlockdata *p; 5534 struct inode *inode = lsp->ls_state->inode; 5535 5536 p = kzalloc(sizeof(*p), GFP_NOFS); 5537 if (p == NULL) 5538 return NULL; 5539 p->arg.fh = NFS_FH(inode); 5540 p->arg.fl = &p->fl; 5541 p->arg.seqid = seqid; 5542 p->res.seqid = seqid; 5543 p->lsp = lsp; 5544 atomic_inc(&lsp->ls_count); 5545 /* Ensure we don't close file until we're done freeing locks! */ 5546 p->ctx = get_nfs_open_context(ctx); 5547 memcpy(&p->fl, fl, sizeof(p->fl)); 5548 p->server = NFS_SERVER(inode); 5549 return p; 5550 } 5551 5552 static void nfs4_locku_release_calldata(void *data) 5553 { 5554 struct nfs4_unlockdata *calldata = data; 5555 nfs_free_seqid(calldata->arg.seqid); 5556 nfs4_put_lock_state(calldata->lsp); 5557 put_nfs_open_context(calldata->ctx); 5558 kfree(calldata); 5559 } 5560 5561 static void nfs4_locku_done(struct rpc_task *task, void *data) 5562 { 5563 struct nfs4_unlockdata *calldata = data; 5564 5565 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 5566 return; 5567 switch (task->tk_status) { 5568 case 0: 5569 renew_lease(calldata->server, calldata->timestamp); 5570 do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl); 5571 if (nfs4_update_lock_stateid(calldata->lsp, 5572 &calldata->res.stateid)) 5573 break; 5574 case -NFS4ERR_BAD_STATEID: 5575 case -NFS4ERR_OLD_STATEID: 5576 case -NFS4ERR_STALE_STATEID: 5577 case -NFS4ERR_EXPIRED: 5578 if (!nfs4_stateid_match(&calldata->arg.stateid, 5579 &calldata->lsp->ls_stateid)) 5580 rpc_restart_call_prepare(task); 5581 break; 5582 default: 5583 if (nfs4_async_handle_error(task, calldata->server, 5584 NULL, NULL) == -EAGAIN) 5585 rpc_restart_call_prepare(task); 5586 } 5587 nfs_release_seqid(calldata->arg.seqid); 5588 } 5589 5590 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 5591 { 5592 struct nfs4_unlockdata *calldata = data; 5593 5594 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 5595 goto out_wait; 5596 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid); 5597 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 5598 /* Note: exit _without_ running nfs4_locku_done */ 5599 goto out_no_action; 5600 } 5601 calldata->timestamp = jiffies; 5602 if (nfs4_setup_sequence(calldata->server, 5603 &calldata->arg.seq_args, 5604 &calldata->res.seq_res, 5605 task) != 0) 5606 nfs_release_seqid(calldata->arg.seqid); 5607 return; 5608 out_no_action: 5609 task->tk_action = NULL; 5610 out_wait: 5611 nfs4_sequence_done(task, &calldata->res.seq_res); 5612 } 5613 5614 static const struct rpc_call_ops nfs4_locku_ops = { 5615 .rpc_call_prepare = nfs4_locku_prepare, 5616 .rpc_call_done = nfs4_locku_done, 5617 .rpc_release = nfs4_locku_release_calldata, 5618 }; 5619 5620 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 5621 struct nfs_open_context *ctx, 5622 struct nfs4_lock_state *lsp, 5623 struct nfs_seqid *seqid) 5624 { 5625 struct nfs4_unlockdata *data; 5626 struct rpc_message msg = { 5627 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 5628 .rpc_cred = ctx->cred, 5629 }; 5630 struct rpc_task_setup task_setup_data = { 5631 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 5632 .rpc_message = &msg, 5633 .callback_ops = &nfs4_locku_ops, 5634 .workqueue = nfsiod_workqueue, 5635 .flags = RPC_TASK_ASYNC, 5636 }; 5637 5638 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 5639 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 5640 5641 /* Ensure this is an unlock - when canceling a lock, the 5642 * canceled lock is passed in, and it won't be an unlock. 5643 */ 5644 fl->fl_type = F_UNLCK; 5645 5646 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 5647 if (data == NULL) { 5648 nfs_free_seqid(seqid); 5649 return ERR_PTR(-ENOMEM); 5650 } 5651 5652 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5653 msg.rpc_argp = &data->arg; 5654 msg.rpc_resp = &data->res; 5655 task_setup_data.callback_data = data; 5656 return rpc_run_task(&task_setup_data); 5657 } 5658 5659 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 5660 { 5661 struct inode *inode = state->inode; 5662 struct nfs4_state_owner *sp = state->owner; 5663 struct nfs_inode *nfsi = NFS_I(inode); 5664 struct nfs_seqid *seqid; 5665 struct nfs4_lock_state *lsp; 5666 struct rpc_task *task; 5667 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 5668 int status = 0; 5669 unsigned char fl_flags = request->fl_flags; 5670 5671 status = nfs4_set_lock_state(state, request); 5672 /* Unlock _before_ we do the RPC call */ 5673 request->fl_flags |= FL_EXISTS; 5674 /* Exclude nfs_delegation_claim_locks() */ 5675 mutex_lock(&sp->so_delegreturn_mutex); 5676 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 5677 down_read(&nfsi->rwsem); 5678 if (do_vfs_lock(inode, request) == -ENOENT) { 5679 up_read(&nfsi->rwsem); 5680 mutex_unlock(&sp->so_delegreturn_mutex); 5681 goto out; 5682 } 5683 up_read(&nfsi->rwsem); 5684 mutex_unlock(&sp->so_delegreturn_mutex); 5685 if (status != 0) 5686 goto out; 5687 /* Is this a delegated lock? */ 5688 lsp = request->fl_u.nfs4_fl.owner; 5689 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 5690 goto out; 5691 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 5692 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 5693 status = -ENOMEM; 5694 if (IS_ERR(seqid)) 5695 goto out; 5696 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 5697 status = PTR_ERR(task); 5698 if (IS_ERR(task)) 5699 goto out; 5700 status = nfs4_wait_for_completion_rpc_task(task); 5701 rpc_put_task(task); 5702 out: 5703 request->fl_flags = fl_flags; 5704 trace_nfs4_unlock(request, state, F_SETLK, status); 5705 return status; 5706 } 5707 5708 struct nfs4_lockdata { 5709 struct nfs_lock_args arg; 5710 struct nfs_lock_res res; 5711 struct nfs4_lock_state *lsp; 5712 struct nfs_open_context *ctx; 5713 struct file_lock fl; 5714 unsigned long timestamp; 5715 int rpc_status; 5716 int cancelled; 5717 struct nfs_server *server; 5718 }; 5719 5720 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 5721 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 5722 gfp_t gfp_mask) 5723 { 5724 struct nfs4_lockdata *p; 5725 struct inode *inode = lsp->ls_state->inode; 5726 struct nfs_server *server = NFS_SERVER(inode); 5727 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 5728 5729 p = kzalloc(sizeof(*p), gfp_mask); 5730 if (p == NULL) 5731 return NULL; 5732 5733 p->arg.fh = NFS_FH(inode); 5734 p->arg.fl = &p->fl; 5735 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 5736 if (IS_ERR(p->arg.open_seqid)) 5737 goto out_free; 5738 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 5739 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 5740 if (IS_ERR(p->arg.lock_seqid)) 5741 goto out_free_seqid; 5742 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 5743 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 5744 p->arg.lock_owner.s_dev = server->s_dev; 5745 p->res.lock_seqid = p->arg.lock_seqid; 5746 p->lsp = lsp; 5747 p->server = server; 5748 atomic_inc(&lsp->ls_count); 5749 p->ctx = get_nfs_open_context(ctx); 5750 get_file(fl->fl_file); 5751 memcpy(&p->fl, fl, sizeof(p->fl)); 5752 return p; 5753 out_free_seqid: 5754 nfs_free_seqid(p->arg.open_seqid); 5755 out_free: 5756 kfree(p); 5757 return NULL; 5758 } 5759 5760 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 5761 { 5762 struct nfs4_lockdata *data = calldata; 5763 struct nfs4_state *state = data->lsp->ls_state; 5764 5765 dprintk("%s: begin!\n", __func__); 5766 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 5767 goto out_wait; 5768 /* Do we need to do an open_to_lock_owner? */ 5769 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 5770 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 5771 goto out_release_lock_seqid; 5772 } 5773 nfs4_stateid_copy(&data->arg.open_stateid, 5774 &state->open_stateid); 5775 data->arg.new_lock_owner = 1; 5776 data->res.open_seqid = data->arg.open_seqid; 5777 } else { 5778 data->arg.new_lock_owner = 0; 5779 nfs4_stateid_copy(&data->arg.lock_stateid, 5780 &data->lsp->ls_stateid); 5781 } 5782 if (!nfs4_valid_open_stateid(state)) { 5783 data->rpc_status = -EBADF; 5784 task->tk_action = NULL; 5785 goto out_release_open_seqid; 5786 } 5787 data->timestamp = jiffies; 5788 if (nfs4_setup_sequence(data->server, 5789 &data->arg.seq_args, 5790 &data->res.seq_res, 5791 task) == 0) 5792 return; 5793 out_release_open_seqid: 5794 nfs_release_seqid(data->arg.open_seqid); 5795 out_release_lock_seqid: 5796 nfs_release_seqid(data->arg.lock_seqid); 5797 out_wait: 5798 nfs4_sequence_done(task, &data->res.seq_res); 5799 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 5800 } 5801 5802 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 5803 { 5804 struct nfs4_lockdata *data = calldata; 5805 struct nfs4_lock_state *lsp = data->lsp; 5806 5807 dprintk("%s: begin!\n", __func__); 5808 5809 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5810 return; 5811 5812 data->rpc_status = task->tk_status; 5813 switch (task->tk_status) { 5814 case 0: 5815 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 5816 data->timestamp); 5817 if (data->arg.new_lock) { 5818 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 5819 if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) { 5820 rpc_restart_call_prepare(task); 5821 break; 5822 } 5823 } 5824 if (data->arg.new_lock_owner != 0) { 5825 nfs_confirm_seqid(&lsp->ls_seqid, 0); 5826 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 5827 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 5828 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 5829 rpc_restart_call_prepare(task); 5830 break; 5831 case -NFS4ERR_BAD_STATEID: 5832 case -NFS4ERR_OLD_STATEID: 5833 case -NFS4ERR_STALE_STATEID: 5834 case -NFS4ERR_EXPIRED: 5835 if (data->arg.new_lock_owner != 0) { 5836 if (!nfs4_stateid_match(&data->arg.open_stateid, 5837 &lsp->ls_state->open_stateid)) 5838 rpc_restart_call_prepare(task); 5839 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 5840 &lsp->ls_stateid)) 5841 rpc_restart_call_prepare(task); 5842 } 5843 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 5844 } 5845 5846 static void nfs4_lock_release(void *calldata) 5847 { 5848 struct nfs4_lockdata *data = calldata; 5849 5850 dprintk("%s: begin!\n", __func__); 5851 nfs_free_seqid(data->arg.open_seqid); 5852 if (data->cancelled != 0) { 5853 struct rpc_task *task; 5854 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 5855 data->arg.lock_seqid); 5856 if (!IS_ERR(task)) 5857 rpc_put_task_async(task); 5858 dprintk("%s: cancelling lock!\n", __func__); 5859 } else 5860 nfs_free_seqid(data->arg.lock_seqid); 5861 nfs4_put_lock_state(data->lsp); 5862 put_nfs_open_context(data->ctx); 5863 fput(data->fl.fl_file); 5864 kfree(data); 5865 dprintk("%s: done!\n", __func__); 5866 } 5867 5868 static const struct rpc_call_ops nfs4_lock_ops = { 5869 .rpc_call_prepare = nfs4_lock_prepare, 5870 .rpc_call_done = nfs4_lock_done, 5871 .rpc_release = nfs4_lock_release, 5872 }; 5873 5874 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 5875 { 5876 switch (error) { 5877 case -NFS4ERR_ADMIN_REVOKED: 5878 case -NFS4ERR_BAD_STATEID: 5879 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5880 if (new_lock_owner != 0 || 5881 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 5882 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 5883 break; 5884 case -NFS4ERR_STALE_STATEID: 5885 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5886 case -NFS4ERR_EXPIRED: 5887 nfs4_schedule_lease_recovery(server->nfs_client); 5888 }; 5889 } 5890 5891 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 5892 { 5893 struct nfs4_lockdata *data; 5894 struct rpc_task *task; 5895 struct rpc_message msg = { 5896 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 5897 .rpc_cred = state->owner->so_cred, 5898 }; 5899 struct rpc_task_setup task_setup_data = { 5900 .rpc_client = NFS_CLIENT(state->inode), 5901 .rpc_message = &msg, 5902 .callback_ops = &nfs4_lock_ops, 5903 .workqueue = nfsiod_workqueue, 5904 .flags = RPC_TASK_ASYNC, 5905 }; 5906 int ret; 5907 5908 dprintk("%s: begin!\n", __func__); 5909 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 5910 fl->fl_u.nfs4_fl.owner, 5911 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 5912 if (data == NULL) 5913 return -ENOMEM; 5914 if (IS_SETLKW(cmd)) 5915 data->arg.block = 1; 5916 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5917 msg.rpc_argp = &data->arg; 5918 msg.rpc_resp = &data->res; 5919 task_setup_data.callback_data = data; 5920 if (recovery_type > NFS_LOCK_NEW) { 5921 if (recovery_type == NFS_LOCK_RECLAIM) 5922 data->arg.reclaim = NFS_LOCK_RECLAIM; 5923 nfs4_set_sequence_privileged(&data->arg.seq_args); 5924 } else 5925 data->arg.new_lock = 1; 5926 task = rpc_run_task(&task_setup_data); 5927 if (IS_ERR(task)) 5928 return PTR_ERR(task); 5929 ret = nfs4_wait_for_completion_rpc_task(task); 5930 if (ret == 0) { 5931 ret = data->rpc_status; 5932 if (ret) 5933 nfs4_handle_setlk_error(data->server, data->lsp, 5934 data->arg.new_lock_owner, ret); 5935 } else 5936 data->cancelled = 1; 5937 rpc_put_task(task); 5938 dprintk("%s: done, ret = %d!\n", __func__, ret); 5939 return ret; 5940 } 5941 5942 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 5943 { 5944 struct nfs_server *server = NFS_SERVER(state->inode); 5945 struct nfs4_exception exception = { 5946 .inode = state->inode, 5947 }; 5948 int err; 5949 5950 do { 5951 /* Cache the lock if possible... */ 5952 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5953 return 0; 5954 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 5955 trace_nfs4_lock_reclaim(request, state, F_SETLK, err); 5956 if (err != -NFS4ERR_DELAY) 5957 break; 5958 nfs4_handle_exception(server, err, &exception); 5959 } while (exception.retry); 5960 return err; 5961 } 5962 5963 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 5964 { 5965 struct nfs_server *server = NFS_SERVER(state->inode); 5966 struct nfs4_exception exception = { 5967 .inode = state->inode, 5968 }; 5969 int err; 5970 5971 err = nfs4_set_lock_state(state, request); 5972 if (err != 0) 5973 return err; 5974 if (!recover_lost_locks) { 5975 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 5976 return 0; 5977 } 5978 do { 5979 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5980 return 0; 5981 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 5982 trace_nfs4_lock_expired(request, state, F_SETLK, err); 5983 switch (err) { 5984 default: 5985 goto out; 5986 case -NFS4ERR_GRACE: 5987 case -NFS4ERR_DELAY: 5988 nfs4_handle_exception(server, err, &exception); 5989 err = 0; 5990 } 5991 } while (exception.retry); 5992 out: 5993 return err; 5994 } 5995 5996 #if defined(CONFIG_NFS_V4_1) 5997 /** 5998 * nfs41_check_expired_locks - possibly free a lock stateid 5999 * 6000 * @state: NFSv4 state for an inode 6001 * 6002 * Returns NFS_OK if recovery for this stateid is now finished. 6003 * Otherwise a negative NFS4ERR value is returned. 6004 */ 6005 static int nfs41_check_expired_locks(struct nfs4_state *state) 6006 { 6007 int status, ret = -NFS4ERR_BAD_STATEID; 6008 struct nfs4_lock_state *lsp; 6009 struct nfs_server *server = NFS_SERVER(state->inode); 6010 6011 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 6012 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 6013 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 6014 6015 status = nfs41_test_stateid(server, 6016 &lsp->ls_stateid, 6017 cred); 6018 trace_nfs4_test_lock_stateid(state, lsp, status); 6019 if (status != NFS_OK) { 6020 /* Free the stateid unless the server 6021 * informs us the stateid is unrecognized. */ 6022 if (status != -NFS4ERR_BAD_STATEID) 6023 nfs41_free_stateid(server, 6024 &lsp->ls_stateid, 6025 cred); 6026 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 6027 ret = status; 6028 } 6029 } 6030 }; 6031 6032 return ret; 6033 } 6034 6035 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 6036 { 6037 int status = NFS_OK; 6038 6039 if (test_bit(LK_STATE_IN_USE, &state->flags)) 6040 status = nfs41_check_expired_locks(state); 6041 if (status != NFS_OK) 6042 status = nfs4_lock_expired(state, request); 6043 return status; 6044 } 6045 #endif 6046 6047 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6048 { 6049 struct nfs_inode *nfsi = NFS_I(state->inode); 6050 unsigned char fl_flags = request->fl_flags; 6051 int status = -ENOLCK; 6052 6053 if ((fl_flags & FL_POSIX) && 6054 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 6055 goto out; 6056 /* Is this a delegated open? */ 6057 status = nfs4_set_lock_state(state, request); 6058 if (status != 0) 6059 goto out; 6060 request->fl_flags |= FL_ACCESS; 6061 status = do_vfs_lock(state->inode, request); 6062 if (status < 0) 6063 goto out; 6064 down_read(&nfsi->rwsem); 6065 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 6066 /* Yes: cache locks! */ 6067 /* ...but avoid races with delegation recall... */ 6068 request->fl_flags = fl_flags & ~FL_SLEEP; 6069 status = do_vfs_lock(state->inode, request); 6070 up_read(&nfsi->rwsem); 6071 goto out; 6072 } 6073 up_read(&nfsi->rwsem); 6074 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 6075 out: 6076 request->fl_flags = fl_flags; 6077 return status; 6078 } 6079 6080 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6081 { 6082 struct nfs4_exception exception = { 6083 .state = state, 6084 .inode = state->inode, 6085 }; 6086 int err; 6087 6088 do { 6089 err = _nfs4_proc_setlk(state, cmd, request); 6090 trace_nfs4_set_lock(request, state, cmd, err); 6091 if (err == -NFS4ERR_DENIED) 6092 err = -EAGAIN; 6093 err = nfs4_handle_exception(NFS_SERVER(state->inode), 6094 err, &exception); 6095 } while (exception.retry); 6096 return err; 6097 } 6098 6099 static int 6100 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 6101 { 6102 struct nfs_open_context *ctx; 6103 struct nfs4_state *state; 6104 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 6105 int status; 6106 6107 /* verify open state */ 6108 ctx = nfs_file_open_context(filp); 6109 state = ctx->state; 6110 6111 if (request->fl_start < 0 || request->fl_end < 0) 6112 return -EINVAL; 6113 6114 if (IS_GETLK(cmd)) { 6115 if (state != NULL) 6116 return nfs4_proc_getlk(state, F_GETLK, request); 6117 return 0; 6118 } 6119 6120 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 6121 return -EINVAL; 6122 6123 if (request->fl_type == F_UNLCK) { 6124 if (state != NULL) 6125 return nfs4_proc_unlck(state, cmd, request); 6126 return 0; 6127 } 6128 6129 if (state == NULL) 6130 return -ENOLCK; 6131 /* 6132 * Don't rely on the VFS having checked the file open mode, 6133 * since it won't do this for flock() locks. 6134 */ 6135 switch (request->fl_type) { 6136 case F_RDLCK: 6137 if (!(filp->f_mode & FMODE_READ)) 6138 return -EBADF; 6139 break; 6140 case F_WRLCK: 6141 if (!(filp->f_mode & FMODE_WRITE)) 6142 return -EBADF; 6143 } 6144 6145 do { 6146 status = nfs4_proc_setlk(state, cmd, request); 6147 if ((status != -EAGAIN) || IS_SETLK(cmd)) 6148 break; 6149 timeout = nfs4_set_lock_task_retry(timeout); 6150 status = -ERESTARTSYS; 6151 if (signalled()) 6152 break; 6153 } while(status < 0); 6154 return status; 6155 } 6156 6157 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 6158 { 6159 struct nfs_server *server = NFS_SERVER(state->inode); 6160 int err; 6161 6162 err = nfs4_set_lock_state(state, fl); 6163 if (err != 0) 6164 return err; 6165 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 6166 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 6167 } 6168 6169 struct nfs_release_lockowner_data { 6170 struct nfs4_lock_state *lsp; 6171 struct nfs_server *server; 6172 struct nfs_release_lockowner_args args; 6173 struct nfs_release_lockowner_res res; 6174 unsigned long timestamp; 6175 }; 6176 6177 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 6178 { 6179 struct nfs_release_lockowner_data *data = calldata; 6180 struct nfs_server *server = data->server; 6181 nfs40_setup_sequence(server->nfs_client->cl_slot_tbl, 6182 &data->args.seq_args, &data->res.seq_res, task); 6183 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6184 data->timestamp = jiffies; 6185 } 6186 6187 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 6188 { 6189 struct nfs_release_lockowner_data *data = calldata; 6190 struct nfs_server *server = data->server; 6191 6192 nfs40_sequence_done(task, &data->res.seq_res); 6193 6194 switch (task->tk_status) { 6195 case 0: 6196 renew_lease(server, data->timestamp); 6197 break; 6198 case -NFS4ERR_STALE_CLIENTID: 6199 case -NFS4ERR_EXPIRED: 6200 nfs4_schedule_lease_recovery(server->nfs_client); 6201 break; 6202 case -NFS4ERR_LEASE_MOVED: 6203 case -NFS4ERR_DELAY: 6204 if (nfs4_async_handle_error(task, server, 6205 NULL, NULL) == -EAGAIN) 6206 rpc_restart_call_prepare(task); 6207 } 6208 } 6209 6210 static void nfs4_release_lockowner_release(void *calldata) 6211 { 6212 struct nfs_release_lockowner_data *data = calldata; 6213 nfs4_free_lock_state(data->server, data->lsp); 6214 kfree(calldata); 6215 } 6216 6217 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6218 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6219 .rpc_call_done = nfs4_release_lockowner_done, 6220 .rpc_release = nfs4_release_lockowner_release, 6221 }; 6222 6223 static void 6224 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6225 { 6226 struct nfs_release_lockowner_data *data; 6227 struct rpc_message msg = { 6228 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6229 }; 6230 6231 if (server->nfs_client->cl_mvops->minor_version != 0) 6232 return; 6233 6234 data = kmalloc(sizeof(*data), GFP_NOFS); 6235 if (!data) 6236 return; 6237 data->lsp = lsp; 6238 data->server = server; 6239 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6240 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6241 data->args.lock_owner.s_dev = server->s_dev; 6242 6243 msg.rpc_argp = &data->args; 6244 msg.rpc_resp = &data->res; 6245 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 6246 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6247 } 6248 6249 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6250 6251 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 6252 struct dentry *dentry, const char *key, 6253 const void *buf, size_t buflen, 6254 int flags) 6255 { 6256 if (strcmp(key, "") != 0) 6257 return -EINVAL; 6258 6259 return nfs4_proc_set_acl(d_inode(dentry), buf, buflen); 6260 } 6261 6262 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 6263 struct dentry *dentry, const char *key, 6264 void *buf, size_t buflen) 6265 { 6266 if (strcmp(key, "") != 0) 6267 return -EINVAL; 6268 6269 return nfs4_proc_get_acl(d_inode(dentry), buf, buflen); 6270 } 6271 6272 static size_t nfs4_xattr_list_nfs4_acl(const struct xattr_handler *handler, 6273 struct dentry *dentry, char *list, 6274 size_t list_len, const char *name, 6275 size_t name_len) 6276 { 6277 size_t len = sizeof(XATTR_NAME_NFSV4_ACL); 6278 6279 if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)))) 6280 return 0; 6281 6282 if (list && len <= list_len) 6283 memcpy(list, XATTR_NAME_NFSV4_ACL, len); 6284 return len; 6285 } 6286 6287 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6288 static inline int nfs4_server_supports_labels(struct nfs_server *server) 6289 { 6290 return server->caps & NFS_CAP_SECURITY_LABEL; 6291 } 6292 6293 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 6294 struct dentry *dentry, const char *key, 6295 const void *buf, size_t buflen, 6296 int flags) 6297 { 6298 if (security_ismaclabel(key)) 6299 return nfs4_set_security_label(dentry, buf, buflen); 6300 6301 return -EOPNOTSUPP; 6302 } 6303 6304 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 6305 struct dentry *dentry, const char *key, 6306 void *buf, size_t buflen) 6307 { 6308 if (security_ismaclabel(key)) 6309 return nfs4_get_security_label(d_inode(dentry), buf, buflen); 6310 return -EOPNOTSUPP; 6311 } 6312 6313 static size_t nfs4_xattr_list_nfs4_label(const struct xattr_handler *handler, 6314 struct dentry *dentry, char *list, 6315 size_t list_len, const char *name, 6316 size_t name_len) 6317 { 6318 size_t len = 0; 6319 6320 if (nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) { 6321 len = security_inode_listsecurity(d_inode(dentry), NULL, 0); 6322 if (list && len <= list_len) 6323 security_inode_listsecurity(d_inode(dentry), list, len); 6324 } 6325 return len; 6326 } 6327 6328 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6329 .prefix = XATTR_SECURITY_PREFIX, 6330 .list = nfs4_xattr_list_nfs4_label, 6331 .get = nfs4_xattr_get_nfs4_label, 6332 .set = nfs4_xattr_set_nfs4_label, 6333 }; 6334 #endif 6335 6336 6337 /* 6338 * nfs_fhget will use either the mounted_on_fileid or the fileid 6339 */ 6340 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6341 { 6342 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6343 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6344 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6345 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6346 return; 6347 6348 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6349 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6350 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6351 fattr->nlink = 2; 6352 } 6353 6354 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6355 const struct qstr *name, 6356 struct nfs4_fs_locations *fs_locations, 6357 struct page *page) 6358 { 6359 struct nfs_server *server = NFS_SERVER(dir); 6360 u32 bitmask[3] = { 6361 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6362 }; 6363 struct nfs4_fs_locations_arg args = { 6364 .dir_fh = NFS_FH(dir), 6365 .name = name, 6366 .page = page, 6367 .bitmask = bitmask, 6368 }; 6369 struct nfs4_fs_locations_res res = { 6370 .fs_locations = fs_locations, 6371 }; 6372 struct rpc_message msg = { 6373 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6374 .rpc_argp = &args, 6375 .rpc_resp = &res, 6376 }; 6377 int status; 6378 6379 dprintk("%s: start\n", __func__); 6380 6381 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6382 * is not supported */ 6383 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6384 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 6385 else 6386 bitmask[0] |= FATTR4_WORD0_FILEID; 6387 6388 nfs_fattr_init(&fs_locations->fattr); 6389 fs_locations->server = server; 6390 fs_locations->nlocations = 0; 6391 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6392 dprintk("%s: returned status = %d\n", __func__, status); 6393 return status; 6394 } 6395 6396 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6397 const struct qstr *name, 6398 struct nfs4_fs_locations *fs_locations, 6399 struct page *page) 6400 { 6401 struct nfs4_exception exception = { }; 6402 int err; 6403 do { 6404 err = _nfs4_proc_fs_locations(client, dir, name, 6405 fs_locations, page); 6406 trace_nfs4_get_fs_locations(dir, name, err); 6407 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6408 &exception); 6409 } while (exception.retry); 6410 return err; 6411 } 6412 6413 /* 6414 * This operation also signals the server that this client is 6415 * performing migration recovery. The server can stop returning 6416 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 6417 * appended to this compound to identify the client ID which is 6418 * performing recovery. 6419 */ 6420 static int _nfs40_proc_get_locations(struct inode *inode, 6421 struct nfs4_fs_locations *locations, 6422 struct page *page, struct rpc_cred *cred) 6423 { 6424 struct nfs_server *server = NFS_SERVER(inode); 6425 struct rpc_clnt *clnt = server->client; 6426 u32 bitmask[2] = { 6427 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6428 }; 6429 struct nfs4_fs_locations_arg args = { 6430 .clientid = server->nfs_client->cl_clientid, 6431 .fh = NFS_FH(inode), 6432 .page = page, 6433 .bitmask = bitmask, 6434 .migration = 1, /* skip LOOKUP */ 6435 .renew = 1, /* append RENEW */ 6436 }; 6437 struct nfs4_fs_locations_res res = { 6438 .fs_locations = locations, 6439 .migration = 1, 6440 .renew = 1, 6441 }; 6442 struct rpc_message msg = { 6443 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6444 .rpc_argp = &args, 6445 .rpc_resp = &res, 6446 .rpc_cred = cred, 6447 }; 6448 unsigned long now = jiffies; 6449 int status; 6450 6451 nfs_fattr_init(&locations->fattr); 6452 locations->server = server; 6453 locations->nlocations = 0; 6454 6455 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6456 nfs4_set_sequence_privileged(&args.seq_args); 6457 status = nfs4_call_sync_sequence(clnt, server, &msg, 6458 &args.seq_args, &res.seq_res); 6459 if (status) 6460 return status; 6461 6462 renew_lease(server, now); 6463 return 0; 6464 } 6465 6466 #ifdef CONFIG_NFS_V4_1 6467 6468 /* 6469 * This operation also signals the server that this client is 6470 * performing migration recovery. The server can stop asserting 6471 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 6472 * performing this operation is identified in the SEQUENCE 6473 * operation in this compound. 6474 * 6475 * When the client supports GETATTR(fs_locations_info), it can 6476 * be plumbed in here. 6477 */ 6478 static int _nfs41_proc_get_locations(struct inode *inode, 6479 struct nfs4_fs_locations *locations, 6480 struct page *page, struct rpc_cred *cred) 6481 { 6482 struct nfs_server *server = NFS_SERVER(inode); 6483 struct rpc_clnt *clnt = server->client; 6484 u32 bitmask[2] = { 6485 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6486 }; 6487 struct nfs4_fs_locations_arg args = { 6488 .fh = NFS_FH(inode), 6489 .page = page, 6490 .bitmask = bitmask, 6491 .migration = 1, /* skip LOOKUP */ 6492 }; 6493 struct nfs4_fs_locations_res res = { 6494 .fs_locations = locations, 6495 .migration = 1, 6496 }; 6497 struct rpc_message msg = { 6498 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6499 .rpc_argp = &args, 6500 .rpc_resp = &res, 6501 .rpc_cred = cred, 6502 }; 6503 int status; 6504 6505 nfs_fattr_init(&locations->fattr); 6506 locations->server = server; 6507 locations->nlocations = 0; 6508 6509 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6510 nfs4_set_sequence_privileged(&args.seq_args); 6511 status = nfs4_call_sync_sequence(clnt, server, &msg, 6512 &args.seq_args, &res.seq_res); 6513 if (status == NFS4_OK && 6514 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6515 status = -NFS4ERR_LEASE_MOVED; 6516 return status; 6517 } 6518 6519 #endif /* CONFIG_NFS_V4_1 */ 6520 6521 /** 6522 * nfs4_proc_get_locations - discover locations for a migrated FSID 6523 * @inode: inode on FSID that is migrating 6524 * @locations: result of query 6525 * @page: buffer 6526 * @cred: credential to use for this operation 6527 * 6528 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 6529 * operation failed, or a negative errno if a local error occurred. 6530 * 6531 * On success, "locations" is filled in, but if the server has 6532 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 6533 * asserted. 6534 * 6535 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 6536 * from this client that require migration recovery. 6537 */ 6538 int nfs4_proc_get_locations(struct inode *inode, 6539 struct nfs4_fs_locations *locations, 6540 struct page *page, struct rpc_cred *cred) 6541 { 6542 struct nfs_server *server = NFS_SERVER(inode); 6543 struct nfs_client *clp = server->nfs_client; 6544 const struct nfs4_mig_recovery_ops *ops = 6545 clp->cl_mvops->mig_recovery_ops; 6546 struct nfs4_exception exception = { }; 6547 int status; 6548 6549 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6550 (unsigned long long)server->fsid.major, 6551 (unsigned long long)server->fsid.minor, 6552 clp->cl_hostname); 6553 nfs_display_fhandle(NFS_FH(inode), __func__); 6554 6555 do { 6556 status = ops->get_locations(inode, locations, page, cred); 6557 if (status != -NFS4ERR_DELAY) 6558 break; 6559 nfs4_handle_exception(server, status, &exception); 6560 } while (exception.retry); 6561 return status; 6562 } 6563 6564 /* 6565 * This operation also signals the server that this client is 6566 * performing "lease moved" recovery. The server can stop 6567 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 6568 * is appended to this compound to identify the client ID which is 6569 * performing recovery. 6570 */ 6571 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6572 { 6573 struct nfs_server *server = NFS_SERVER(inode); 6574 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 6575 struct rpc_clnt *clnt = server->client; 6576 struct nfs4_fsid_present_arg args = { 6577 .fh = NFS_FH(inode), 6578 .clientid = clp->cl_clientid, 6579 .renew = 1, /* append RENEW */ 6580 }; 6581 struct nfs4_fsid_present_res res = { 6582 .renew = 1, 6583 }; 6584 struct rpc_message msg = { 6585 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6586 .rpc_argp = &args, 6587 .rpc_resp = &res, 6588 .rpc_cred = cred, 6589 }; 6590 unsigned long now = jiffies; 6591 int status; 6592 6593 res.fh = nfs_alloc_fhandle(); 6594 if (res.fh == NULL) 6595 return -ENOMEM; 6596 6597 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6598 nfs4_set_sequence_privileged(&args.seq_args); 6599 status = nfs4_call_sync_sequence(clnt, server, &msg, 6600 &args.seq_args, &res.seq_res); 6601 nfs_free_fhandle(res.fh); 6602 if (status) 6603 return status; 6604 6605 do_renew_lease(clp, now); 6606 return 0; 6607 } 6608 6609 #ifdef CONFIG_NFS_V4_1 6610 6611 /* 6612 * This operation also signals the server that this client is 6613 * performing "lease moved" recovery. The server can stop asserting 6614 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 6615 * this operation is identified in the SEQUENCE operation in this 6616 * compound. 6617 */ 6618 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6619 { 6620 struct nfs_server *server = NFS_SERVER(inode); 6621 struct rpc_clnt *clnt = server->client; 6622 struct nfs4_fsid_present_arg args = { 6623 .fh = NFS_FH(inode), 6624 }; 6625 struct nfs4_fsid_present_res res = { 6626 }; 6627 struct rpc_message msg = { 6628 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6629 .rpc_argp = &args, 6630 .rpc_resp = &res, 6631 .rpc_cred = cred, 6632 }; 6633 int status; 6634 6635 res.fh = nfs_alloc_fhandle(); 6636 if (res.fh == NULL) 6637 return -ENOMEM; 6638 6639 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6640 nfs4_set_sequence_privileged(&args.seq_args); 6641 status = nfs4_call_sync_sequence(clnt, server, &msg, 6642 &args.seq_args, &res.seq_res); 6643 nfs_free_fhandle(res.fh); 6644 if (status == NFS4_OK && 6645 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6646 status = -NFS4ERR_LEASE_MOVED; 6647 return status; 6648 } 6649 6650 #endif /* CONFIG_NFS_V4_1 */ 6651 6652 /** 6653 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 6654 * @inode: inode on FSID to check 6655 * @cred: credential to use for this operation 6656 * 6657 * Server indicates whether the FSID is present, moved, or not 6658 * recognized. This operation is necessary to clear a LEASE_MOVED 6659 * condition for this client ID. 6660 * 6661 * Returns NFS4_OK if the FSID is present on this server, 6662 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 6663 * NFS4ERR code if some error occurred on the server, or a 6664 * negative errno if a local failure occurred. 6665 */ 6666 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6667 { 6668 struct nfs_server *server = NFS_SERVER(inode); 6669 struct nfs_client *clp = server->nfs_client; 6670 const struct nfs4_mig_recovery_ops *ops = 6671 clp->cl_mvops->mig_recovery_ops; 6672 struct nfs4_exception exception = { }; 6673 int status; 6674 6675 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6676 (unsigned long long)server->fsid.major, 6677 (unsigned long long)server->fsid.minor, 6678 clp->cl_hostname); 6679 nfs_display_fhandle(NFS_FH(inode), __func__); 6680 6681 do { 6682 status = ops->fsid_present(inode, cred); 6683 if (status != -NFS4ERR_DELAY) 6684 break; 6685 nfs4_handle_exception(server, status, &exception); 6686 } while (exception.retry); 6687 return status; 6688 } 6689 6690 /** 6691 * If 'use_integrity' is true and the state managment nfs_client 6692 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 6693 * and the machine credential as per RFC3530bis and RFC5661 Security 6694 * Considerations sections. Otherwise, just use the user cred with the 6695 * filesystem's rpc_client. 6696 */ 6697 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 6698 { 6699 int status; 6700 struct nfs4_secinfo_arg args = { 6701 .dir_fh = NFS_FH(dir), 6702 .name = name, 6703 }; 6704 struct nfs4_secinfo_res res = { 6705 .flavors = flavors, 6706 }; 6707 struct rpc_message msg = { 6708 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 6709 .rpc_argp = &args, 6710 .rpc_resp = &res, 6711 }; 6712 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 6713 struct rpc_cred *cred = NULL; 6714 6715 if (use_integrity) { 6716 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 6717 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 6718 msg.rpc_cred = cred; 6719 } 6720 6721 dprintk("NFS call secinfo %s\n", name->name); 6722 6723 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 6724 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 6725 6726 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 6727 &res.seq_res, 0); 6728 dprintk("NFS reply secinfo: %d\n", status); 6729 6730 if (cred) 6731 put_rpccred(cred); 6732 6733 return status; 6734 } 6735 6736 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 6737 struct nfs4_secinfo_flavors *flavors) 6738 { 6739 struct nfs4_exception exception = { }; 6740 int err; 6741 do { 6742 err = -NFS4ERR_WRONGSEC; 6743 6744 /* try to use integrity protection with machine cred */ 6745 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 6746 err = _nfs4_proc_secinfo(dir, name, flavors, true); 6747 6748 /* 6749 * if unable to use integrity protection, or SECINFO with 6750 * integrity protection returns NFS4ERR_WRONGSEC (which is 6751 * disallowed by spec, but exists in deployed servers) use 6752 * the current filesystem's rpc_client and the user cred. 6753 */ 6754 if (err == -NFS4ERR_WRONGSEC) 6755 err = _nfs4_proc_secinfo(dir, name, flavors, false); 6756 6757 trace_nfs4_secinfo(dir, name, err); 6758 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6759 &exception); 6760 } while (exception.retry); 6761 return err; 6762 } 6763 6764 #ifdef CONFIG_NFS_V4_1 6765 /* 6766 * Check the exchange flags returned by the server for invalid flags, having 6767 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 6768 * DS flags set. 6769 */ 6770 static int nfs4_check_cl_exchange_flags(u32 flags) 6771 { 6772 if (flags & ~EXCHGID4_FLAG_MASK_R) 6773 goto out_inval; 6774 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 6775 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 6776 goto out_inval; 6777 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 6778 goto out_inval; 6779 return NFS_OK; 6780 out_inval: 6781 return -NFS4ERR_INVAL; 6782 } 6783 6784 static bool 6785 nfs41_same_server_scope(struct nfs41_server_scope *a, 6786 struct nfs41_server_scope *b) 6787 { 6788 if (a->server_scope_sz == b->server_scope_sz && 6789 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 6790 return true; 6791 6792 return false; 6793 } 6794 6795 /* 6796 * nfs4_proc_bind_conn_to_session() 6797 * 6798 * The 4.1 client currently uses the same TCP connection for the 6799 * fore and backchannel. 6800 */ 6801 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 6802 { 6803 int status; 6804 struct nfs41_bind_conn_to_session_args args = { 6805 .client = clp, 6806 .dir = NFS4_CDFC4_FORE_OR_BOTH, 6807 }; 6808 struct nfs41_bind_conn_to_session_res res; 6809 struct rpc_message msg = { 6810 .rpc_proc = 6811 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 6812 .rpc_argp = &args, 6813 .rpc_resp = &res, 6814 .rpc_cred = cred, 6815 }; 6816 6817 dprintk("--> %s\n", __func__); 6818 6819 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 6820 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 6821 args.dir = NFS4_CDFC4_FORE; 6822 6823 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6824 trace_nfs4_bind_conn_to_session(clp, status); 6825 if (status == 0) { 6826 if (memcmp(res.sessionid.data, 6827 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 6828 dprintk("NFS: %s: Session ID mismatch\n", __func__); 6829 status = -EIO; 6830 goto out; 6831 } 6832 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 6833 dprintk("NFS: %s: Unexpected direction from server\n", 6834 __func__); 6835 status = -EIO; 6836 goto out; 6837 } 6838 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 6839 dprintk("NFS: %s: Server returned RDMA mode = true\n", 6840 __func__); 6841 status = -EIO; 6842 goto out; 6843 } 6844 } 6845 out: 6846 dprintk("<-- %s status= %d\n", __func__, status); 6847 return status; 6848 } 6849 6850 /* 6851 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 6852 * and operations we'd like to see to enable certain features in the allow map 6853 */ 6854 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 6855 .how = SP4_MACH_CRED, 6856 .enforce.u.words = { 6857 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6858 1 << (OP_EXCHANGE_ID - 32) | 6859 1 << (OP_CREATE_SESSION - 32) | 6860 1 << (OP_DESTROY_SESSION - 32) | 6861 1 << (OP_DESTROY_CLIENTID - 32) 6862 }, 6863 .allow.u.words = { 6864 [0] = 1 << (OP_CLOSE) | 6865 1 << (OP_LOCKU) | 6866 1 << (OP_COMMIT), 6867 [1] = 1 << (OP_SECINFO - 32) | 6868 1 << (OP_SECINFO_NO_NAME - 32) | 6869 1 << (OP_TEST_STATEID - 32) | 6870 1 << (OP_FREE_STATEID - 32) | 6871 1 << (OP_WRITE - 32) 6872 } 6873 }; 6874 6875 /* 6876 * Select the state protection mode for client `clp' given the server results 6877 * from exchange_id in `sp'. 6878 * 6879 * Returns 0 on success, negative errno otherwise. 6880 */ 6881 static int nfs4_sp4_select_mode(struct nfs_client *clp, 6882 struct nfs41_state_protection *sp) 6883 { 6884 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 6885 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6886 1 << (OP_EXCHANGE_ID - 32) | 6887 1 << (OP_CREATE_SESSION - 32) | 6888 1 << (OP_DESTROY_SESSION - 32) | 6889 1 << (OP_DESTROY_CLIENTID - 32) 6890 }; 6891 unsigned int i; 6892 6893 if (sp->how == SP4_MACH_CRED) { 6894 /* Print state protect result */ 6895 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 6896 for (i = 0; i <= LAST_NFS4_OP; i++) { 6897 if (test_bit(i, sp->enforce.u.longs)) 6898 dfprintk(MOUNT, " enforce op %d\n", i); 6899 if (test_bit(i, sp->allow.u.longs)) 6900 dfprintk(MOUNT, " allow op %d\n", i); 6901 } 6902 6903 /* make sure nothing is on enforce list that isn't supported */ 6904 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 6905 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 6906 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6907 return -EINVAL; 6908 } 6909 } 6910 6911 /* 6912 * Minimal mode - state operations are allowed to use machine 6913 * credential. Note this already happens by default, so the 6914 * client doesn't have to do anything more than the negotiation. 6915 * 6916 * NOTE: we don't care if EXCHANGE_ID is in the list - 6917 * we're already using the machine cred for exchange_id 6918 * and will never use a different cred. 6919 */ 6920 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 6921 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 6922 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 6923 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 6924 dfprintk(MOUNT, "sp4_mach_cred:\n"); 6925 dfprintk(MOUNT, " minimal mode enabled\n"); 6926 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags); 6927 } else { 6928 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6929 return -EINVAL; 6930 } 6931 6932 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 6933 test_bit(OP_LOCKU, sp->allow.u.longs)) { 6934 dfprintk(MOUNT, " cleanup mode enabled\n"); 6935 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags); 6936 } 6937 6938 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 6939 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 6940 dfprintk(MOUNT, " secinfo mode enabled\n"); 6941 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags); 6942 } 6943 6944 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 6945 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 6946 dfprintk(MOUNT, " stateid mode enabled\n"); 6947 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags); 6948 } 6949 6950 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 6951 dfprintk(MOUNT, " write mode enabled\n"); 6952 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags); 6953 } 6954 6955 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 6956 dfprintk(MOUNT, " commit mode enabled\n"); 6957 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags); 6958 } 6959 } 6960 6961 return 0; 6962 } 6963 6964 /* 6965 * _nfs4_proc_exchange_id() 6966 * 6967 * Wrapper for EXCHANGE_ID operation. 6968 */ 6969 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 6970 u32 sp4_how) 6971 { 6972 nfs4_verifier verifier; 6973 struct nfs41_exchange_id_args args = { 6974 .verifier = &verifier, 6975 .client = clp, 6976 #ifdef CONFIG_NFS_V4_1_MIGRATION 6977 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6978 EXCHGID4_FLAG_BIND_PRINC_STATEID | 6979 EXCHGID4_FLAG_SUPP_MOVED_MIGR, 6980 #else 6981 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6982 EXCHGID4_FLAG_BIND_PRINC_STATEID, 6983 #endif 6984 }; 6985 struct nfs41_exchange_id_res res = { 6986 0 6987 }; 6988 int status; 6989 struct rpc_message msg = { 6990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 6991 .rpc_argp = &args, 6992 .rpc_resp = &res, 6993 .rpc_cred = cred, 6994 }; 6995 6996 nfs4_init_boot_verifier(clp, &verifier); 6997 6998 status = nfs4_init_uniform_client_string(clp); 6999 if (status) 7000 goto out; 7001 7002 dprintk("NFS call exchange_id auth=%s, '%s'\n", 7003 clp->cl_rpcclient->cl_auth->au_ops->au_name, 7004 clp->cl_owner_id); 7005 7006 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 7007 GFP_NOFS); 7008 if (unlikely(res.server_owner == NULL)) { 7009 status = -ENOMEM; 7010 goto out; 7011 } 7012 7013 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 7014 GFP_NOFS); 7015 if (unlikely(res.server_scope == NULL)) { 7016 status = -ENOMEM; 7017 goto out_server_owner; 7018 } 7019 7020 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 7021 if (unlikely(res.impl_id == NULL)) { 7022 status = -ENOMEM; 7023 goto out_server_scope; 7024 } 7025 7026 switch (sp4_how) { 7027 case SP4_NONE: 7028 args.state_protect.how = SP4_NONE; 7029 break; 7030 7031 case SP4_MACH_CRED: 7032 args.state_protect = nfs4_sp4_mach_cred_request; 7033 break; 7034 7035 default: 7036 /* unsupported! */ 7037 WARN_ON_ONCE(1); 7038 status = -EINVAL; 7039 goto out_impl_id; 7040 } 7041 7042 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7043 trace_nfs4_exchange_id(clp, status); 7044 if (status == 0) 7045 status = nfs4_check_cl_exchange_flags(res.flags); 7046 7047 if (status == 0) 7048 status = nfs4_sp4_select_mode(clp, &res.state_protect); 7049 7050 if (status == 0) { 7051 clp->cl_clientid = res.clientid; 7052 clp->cl_exchange_flags = res.flags; 7053 /* Client ID is not confirmed */ 7054 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) { 7055 clear_bit(NFS4_SESSION_ESTABLISHED, 7056 &clp->cl_session->session_state); 7057 clp->cl_seqid = res.seqid; 7058 } 7059 7060 kfree(clp->cl_serverowner); 7061 clp->cl_serverowner = res.server_owner; 7062 res.server_owner = NULL; 7063 7064 /* use the most recent implementation id */ 7065 kfree(clp->cl_implid); 7066 clp->cl_implid = res.impl_id; 7067 res.impl_id = NULL; 7068 7069 if (clp->cl_serverscope != NULL && 7070 !nfs41_same_server_scope(clp->cl_serverscope, 7071 res.server_scope)) { 7072 dprintk("%s: server_scope mismatch detected\n", 7073 __func__); 7074 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 7075 kfree(clp->cl_serverscope); 7076 clp->cl_serverscope = NULL; 7077 } 7078 7079 if (clp->cl_serverscope == NULL) { 7080 clp->cl_serverscope = res.server_scope; 7081 res.server_scope = NULL; 7082 } 7083 } 7084 7085 out_impl_id: 7086 kfree(res.impl_id); 7087 out_server_scope: 7088 kfree(res.server_scope); 7089 out_server_owner: 7090 kfree(res.server_owner); 7091 out: 7092 if (clp->cl_implid != NULL) 7093 dprintk("NFS reply exchange_id: Server Implementation ID: " 7094 "domain: %s, name: %s, date: %llu,%u\n", 7095 clp->cl_implid->domain, clp->cl_implid->name, 7096 clp->cl_implid->date.seconds, 7097 clp->cl_implid->date.nseconds); 7098 dprintk("NFS reply exchange_id: %d\n", status); 7099 return status; 7100 } 7101 7102 /* 7103 * nfs4_proc_exchange_id() 7104 * 7105 * Returns zero, a negative errno, or a negative NFS4ERR status code. 7106 * 7107 * Since the clientid has expired, all compounds using sessions 7108 * associated with the stale clientid will be returning 7109 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 7110 * be in some phase of session reset. 7111 * 7112 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 7113 */ 7114 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 7115 { 7116 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 7117 int status; 7118 7119 /* try SP4_MACH_CRED if krb5i/p */ 7120 if (authflavor == RPC_AUTH_GSS_KRB5I || 7121 authflavor == RPC_AUTH_GSS_KRB5P) { 7122 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 7123 if (!status) 7124 return 0; 7125 } 7126 7127 /* try SP4_NONE */ 7128 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 7129 } 7130 7131 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 7132 struct rpc_cred *cred) 7133 { 7134 struct rpc_message msg = { 7135 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 7136 .rpc_argp = clp, 7137 .rpc_cred = cred, 7138 }; 7139 int status; 7140 7141 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7142 trace_nfs4_destroy_clientid(clp, status); 7143 if (status) 7144 dprintk("NFS: Got error %d from the server %s on " 7145 "DESTROY_CLIENTID.", status, clp->cl_hostname); 7146 return status; 7147 } 7148 7149 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 7150 struct rpc_cred *cred) 7151 { 7152 unsigned int loop; 7153 int ret; 7154 7155 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 7156 ret = _nfs4_proc_destroy_clientid(clp, cred); 7157 switch (ret) { 7158 case -NFS4ERR_DELAY: 7159 case -NFS4ERR_CLIENTID_BUSY: 7160 ssleep(1); 7161 break; 7162 default: 7163 return ret; 7164 } 7165 } 7166 return 0; 7167 } 7168 7169 int nfs4_destroy_clientid(struct nfs_client *clp) 7170 { 7171 struct rpc_cred *cred; 7172 int ret = 0; 7173 7174 if (clp->cl_mvops->minor_version < 1) 7175 goto out; 7176 if (clp->cl_exchange_flags == 0) 7177 goto out; 7178 if (clp->cl_preserve_clid) 7179 goto out; 7180 cred = nfs4_get_clid_cred(clp); 7181 ret = nfs4_proc_destroy_clientid(clp, cred); 7182 if (cred) 7183 put_rpccred(cred); 7184 switch (ret) { 7185 case 0: 7186 case -NFS4ERR_STALE_CLIENTID: 7187 clp->cl_exchange_flags = 0; 7188 } 7189 out: 7190 return ret; 7191 } 7192 7193 struct nfs4_get_lease_time_data { 7194 struct nfs4_get_lease_time_args *args; 7195 struct nfs4_get_lease_time_res *res; 7196 struct nfs_client *clp; 7197 }; 7198 7199 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 7200 void *calldata) 7201 { 7202 struct nfs4_get_lease_time_data *data = 7203 (struct nfs4_get_lease_time_data *)calldata; 7204 7205 dprintk("--> %s\n", __func__); 7206 /* just setup sequence, do not trigger session recovery 7207 since we're invoked within one */ 7208 nfs41_setup_sequence(data->clp->cl_session, 7209 &data->args->la_seq_args, 7210 &data->res->lr_seq_res, 7211 task); 7212 dprintk("<-- %s\n", __func__); 7213 } 7214 7215 /* 7216 * Called from nfs4_state_manager thread for session setup, so don't recover 7217 * from sequence operation or clientid errors. 7218 */ 7219 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 7220 { 7221 struct nfs4_get_lease_time_data *data = 7222 (struct nfs4_get_lease_time_data *)calldata; 7223 7224 dprintk("--> %s\n", __func__); 7225 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 7226 return; 7227 switch (task->tk_status) { 7228 case -NFS4ERR_DELAY: 7229 case -NFS4ERR_GRACE: 7230 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 7231 rpc_delay(task, NFS4_POLL_RETRY_MIN); 7232 task->tk_status = 0; 7233 /* fall through */ 7234 case -NFS4ERR_RETRY_UNCACHED_REP: 7235 rpc_restart_call_prepare(task); 7236 return; 7237 } 7238 dprintk("<-- %s\n", __func__); 7239 } 7240 7241 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 7242 .rpc_call_prepare = nfs4_get_lease_time_prepare, 7243 .rpc_call_done = nfs4_get_lease_time_done, 7244 }; 7245 7246 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 7247 { 7248 struct rpc_task *task; 7249 struct nfs4_get_lease_time_args args; 7250 struct nfs4_get_lease_time_res res = { 7251 .lr_fsinfo = fsinfo, 7252 }; 7253 struct nfs4_get_lease_time_data data = { 7254 .args = &args, 7255 .res = &res, 7256 .clp = clp, 7257 }; 7258 struct rpc_message msg = { 7259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 7260 .rpc_argp = &args, 7261 .rpc_resp = &res, 7262 }; 7263 struct rpc_task_setup task_setup = { 7264 .rpc_client = clp->cl_rpcclient, 7265 .rpc_message = &msg, 7266 .callback_ops = &nfs4_get_lease_time_ops, 7267 .callback_data = &data, 7268 .flags = RPC_TASK_TIMEOUT, 7269 }; 7270 int status; 7271 7272 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 7273 nfs4_set_sequence_privileged(&args.la_seq_args); 7274 dprintk("--> %s\n", __func__); 7275 task = rpc_run_task(&task_setup); 7276 7277 if (IS_ERR(task)) 7278 status = PTR_ERR(task); 7279 else { 7280 status = task->tk_status; 7281 rpc_put_task(task); 7282 } 7283 dprintk("<-- %s return %d\n", __func__, status); 7284 7285 return status; 7286 } 7287 7288 /* 7289 * Initialize the values to be used by the client in CREATE_SESSION 7290 * If nfs4_init_session set the fore channel request and response sizes, 7291 * use them. 7292 * 7293 * Set the back channel max_resp_sz_cached to zero to force the client to 7294 * always set csa_cachethis to FALSE because the current implementation 7295 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 7296 */ 7297 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 7298 { 7299 unsigned int max_rqst_sz, max_resp_sz; 7300 7301 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 7302 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 7303 7304 /* Fore channel attributes */ 7305 args->fc_attrs.max_rqst_sz = max_rqst_sz; 7306 args->fc_attrs.max_resp_sz = max_resp_sz; 7307 args->fc_attrs.max_ops = NFS4_MAX_OPS; 7308 args->fc_attrs.max_reqs = max_session_slots; 7309 7310 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 7311 "max_ops=%u max_reqs=%u\n", 7312 __func__, 7313 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 7314 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 7315 7316 /* Back channel attributes */ 7317 args->bc_attrs.max_rqst_sz = PAGE_SIZE; 7318 args->bc_attrs.max_resp_sz = PAGE_SIZE; 7319 args->bc_attrs.max_resp_sz_cached = 0; 7320 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 7321 args->bc_attrs.max_reqs = 1; 7322 7323 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 7324 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 7325 __func__, 7326 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 7327 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 7328 args->bc_attrs.max_reqs); 7329 } 7330 7331 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 7332 struct nfs41_create_session_res *res) 7333 { 7334 struct nfs4_channel_attrs *sent = &args->fc_attrs; 7335 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 7336 7337 if (rcvd->max_resp_sz > sent->max_resp_sz) 7338 return -EINVAL; 7339 /* 7340 * Our requested max_ops is the minimum we need; we're not 7341 * prepared to break up compounds into smaller pieces than that. 7342 * So, no point even trying to continue if the server won't 7343 * cooperate: 7344 */ 7345 if (rcvd->max_ops < sent->max_ops) 7346 return -EINVAL; 7347 if (rcvd->max_reqs == 0) 7348 return -EINVAL; 7349 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 7350 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 7351 return 0; 7352 } 7353 7354 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 7355 struct nfs41_create_session_res *res) 7356 { 7357 struct nfs4_channel_attrs *sent = &args->bc_attrs; 7358 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 7359 7360 if (!(res->flags & SESSION4_BACK_CHAN)) 7361 goto out; 7362 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 7363 return -EINVAL; 7364 if (rcvd->max_resp_sz < sent->max_resp_sz) 7365 return -EINVAL; 7366 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 7367 return -EINVAL; 7368 /* These would render the backchannel useless: */ 7369 if (rcvd->max_ops != sent->max_ops) 7370 return -EINVAL; 7371 if (rcvd->max_reqs != sent->max_reqs) 7372 return -EINVAL; 7373 out: 7374 return 0; 7375 } 7376 7377 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 7378 struct nfs41_create_session_res *res) 7379 { 7380 int ret; 7381 7382 ret = nfs4_verify_fore_channel_attrs(args, res); 7383 if (ret) 7384 return ret; 7385 return nfs4_verify_back_channel_attrs(args, res); 7386 } 7387 7388 static void nfs4_update_session(struct nfs4_session *session, 7389 struct nfs41_create_session_res *res) 7390 { 7391 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 7392 /* Mark client id and session as being confirmed */ 7393 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 7394 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 7395 session->flags = res->flags; 7396 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 7397 if (res->flags & SESSION4_BACK_CHAN) 7398 memcpy(&session->bc_attrs, &res->bc_attrs, 7399 sizeof(session->bc_attrs)); 7400 } 7401 7402 static int _nfs4_proc_create_session(struct nfs_client *clp, 7403 struct rpc_cred *cred) 7404 { 7405 struct nfs4_session *session = clp->cl_session; 7406 struct nfs41_create_session_args args = { 7407 .client = clp, 7408 .clientid = clp->cl_clientid, 7409 .seqid = clp->cl_seqid, 7410 .cb_program = NFS4_CALLBACK, 7411 }; 7412 struct nfs41_create_session_res res; 7413 7414 struct rpc_message msg = { 7415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 7416 .rpc_argp = &args, 7417 .rpc_resp = &res, 7418 .rpc_cred = cred, 7419 }; 7420 int status; 7421 7422 nfs4_init_channel_attrs(&args); 7423 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 7424 7425 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7426 trace_nfs4_create_session(clp, status); 7427 7428 if (!status) { 7429 /* Verify the session's negotiated channel_attrs values */ 7430 status = nfs4_verify_channel_attrs(&args, &res); 7431 /* Increment the clientid slot sequence id */ 7432 if (clp->cl_seqid == res.seqid) 7433 clp->cl_seqid++; 7434 if (status) 7435 goto out; 7436 nfs4_update_session(session, &res); 7437 } 7438 out: 7439 return status; 7440 } 7441 7442 /* 7443 * Issues a CREATE_SESSION operation to the server. 7444 * It is the responsibility of the caller to verify the session is 7445 * expired before calling this routine. 7446 */ 7447 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 7448 { 7449 int status; 7450 unsigned *ptr; 7451 struct nfs4_session *session = clp->cl_session; 7452 7453 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 7454 7455 status = _nfs4_proc_create_session(clp, cred); 7456 if (status) 7457 goto out; 7458 7459 /* Init or reset the session slot tables */ 7460 status = nfs4_setup_session_slot_tables(session); 7461 dprintk("slot table setup returned %d\n", status); 7462 if (status) 7463 goto out; 7464 7465 ptr = (unsigned *)&session->sess_id.data[0]; 7466 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 7467 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 7468 out: 7469 dprintk("<-- %s\n", __func__); 7470 return status; 7471 } 7472 7473 /* 7474 * Issue the over-the-wire RPC DESTROY_SESSION. 7475 * The caller must serialize access to this routine. 7476 */ 7477 int nfs4_proc_destroy_session(struct nfs4_session *session, 7478 struct rpc_cred *cred) 7479 { 7480 struct rpc_message msg = { 7481 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 7482 .rpc_argp = session, 7483 .rpc_cred = cred, 7484 }; 7485 int status = 0; 7486 7487 dprintk("--> nfs4_proc_destroy_session\n"); 7488 7489 /* session is still being setup */ 7490 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 7491 return 0; 7492 7493 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7494 trace_nfs4_destroy_session(session->clp, status); 7495 7496 if (status) 7497 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 7498 "Session has been destroyed regardless...\n", status); 7499 7500 dprintk("<-- nfs4_proc_destroy_session\n"); 7501 return status; 7502 } 7503 7504 /* 7505 * Renew the cl_session lease. 7506 */ 7507 struct nfs4_sequence_data { 7508 struct nfs_client *clp; 7509 struct nfs4_sequence_args args; 7510 struct nfs4_sequence_res res; 7511 }; 7512 7513 static void nfs41_sequence_release(void *data) 7514 { 7515 struct nfs4_sequence_data *calldata = data; 7516 struct nfs_client *clp = calldata->clp; 7517 7518 if (atomic_read(&clp->cl_count) > 1) 7519 nfs4_schedule_state_renewal(clp); 7520 nfs_put_client(clp); 7521 kfree(calldata); 7522 } 7523 7524 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7525 { 7526 switch(task->tk_status) { 7527 case -NFS4ERR_DELAY: 7528 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7529 return -EAGAIN; 7530 default: 7531 nfs4_schedule_lease_recovery(clp); 7532 } 7533 return 0; 7534 } 7535 7536 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 7537 { 7538 struct nfs4_sequence_data *calldata = data; 7539 struct nfs_client *clp = calldata->clp; 7540 7541 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 7542 return; 7543 7544 trace_nfs4_sequence(clp, task->tk_status); 7545 if (task->tk_status < 0) { 7546 dprintk("%s ERROR %d\n", __func__, task->tk_status); 7547 if (atomic_read(&clp->cl_count) == 1) 7548 goto out; 7549 7550 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 7551 rpc_restart_call_prepare(task); 7552 return; 7553 } 7554 } 7555 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 7556 out: 7557 dprintk("<-- %s\n", __func__); 7558 } 7559 7560 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 7561 { 7562 struct nfs4_sequence_data *calldata = data; 7563 struct nfs_client *clp = calldata->clp; 7564 struct nfs4_sequence_args *args; 7565 struct nfs4_sequence_res *res; 7566 7567 args = task->tk_msg.rpc_argp; 7568 res = task->tk_msg.rpc_resp; 7569 7570 nfs41_setup_sequence(clp->cl_session, args, res, task); 7571 } 7572 7573 static const struct rpc_call_ops nfs41_sequence_ops = { 7574 .rpc_call_done = nfs41_sequence_call_done, 7575 .rpc_call_prepare = nfs41_sequence_prepare, 7576 .rpc_release = nfs41_sequence_release, 7577 }; 7578 7579 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 7580 struct rpc_cred *cred, 7581 bool is_privileged) 7582 { 7583 struct nfs4_sequence_data *calldata; 7584 struct rpc_message msg = { 7585 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 7586 .rpc_cred = cred, 7587 }; 7588 struct rpc_task_setup task_setup_data = { 7589 .rpc_client = clp->cl_rpcclient, 7590 .rpc_message = &msg, 7591 .callback_ops = &nfs41_sequence_ops, 7592 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 7593 }; 7594 7595 if (!atomic_inc_not_zero(&clp->cl_count)) 7596 return ERR_PTR(-EIO); 7597 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7598 if (calldata == NULL) { 7599 nfs_put_client(clp); 7600 return ERR_PTR(-ENOMEM); 7601 } 7602 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 7603 if (is_privileged) 7604 nfs4_set_sequence_privileged(&calldata->args); 7605 msg.rpc_argp = &calldata->args; 7606 msg.rpc_resp = &calldata->res; 7607 calldata->clp = clp; 7608 task_setup_data.callback_data = calldata; 7609 7610 return rpc_run_task(&task_setup_data); 7611 } 7612 7613 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 7614 { 7615 struct rpc_task *task; 7616 int ret = 0; 7617 7618 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 7619 return -EAGAIN; 7620 task = _nfs41_proc_sequence(clp, cred, false); 7621 if (IS_ERR(task)) 7622 ret = PTR_ERR(task); 7623 else 7624 rpc_put_task_async(task); 7625 dprintk("<-- %s status=%d\n", __func__, ret); 7626 return ret; 7627 } 7628 7629 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 7630 { 7631 struct rpc_task *task; 7632 int ret; 7633 7634 task = _nfs41_proc_sequence(clp, cred, true); 7635 if (IS_ERR(task)) { 7636 ret = PTR_ERR(task); 7637 goto out; 7638 } 7639 ret = rpc_wait_for_completion_task(task); 7640 if (!ret) 7641 ret = task->tk_status; 7642 rpc_put_task(task); 7643 out: 7644 dprintk("<-- %s status=%d\n", __func__, ret); 7645 return ret; 7646 } 7647 7648 struct nfs4_reclaim_complete_data { 7649 struct nfs_client *clp; 7650 struct nfs41_reclaim_complete_args arg; 7651 struct nfs41_reclaim_complete_res res; 7652 }; 7653 7654 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 7655 { 7656 struct nfs4_reclaim_complete_data *calldata = data; 7657 7658 nfs41_setup_sequence(calldata->clp->cl_session, 7659 &calldata->arg.seq_args, 7660 &calldata->res.seq_res, 7661 task); 7662 } 7663 7664 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7665 { 7666 switch(task->tk_status) { 7667 case 0: 7668 case -NFS4ERR_COMPLETE_ALREADY: 7669 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 7670 break; 7671 case -NFS4ERR_DELAY: 7672 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7673 /* fall through */ 7674 case -NFS4ERR_RETRY_UNCACHED_REP: 7675 return -EAGAIN; 7676 default: 7677 nfs4_schedule_lease_recovery(clp); 7678 } 7679 return 0; 7680 } 7681 7682 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 7683 { 7684 struct nfs4_reclaim_complete_data *calldata = data; 7685 struct nfs_client *clp = calldata->clp; 7686 struct nfs4_sequence_res *res = &calldata->res.seq_res; 7687 7688 dprintk("--> %s\n", __func__); 7689 if (!nfs41_sequence_done(task, res)) 7690 return; 7691 7692 trace_nfs4_reclaim_complete(clp, task->tk_status); 7693 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 7694 rpc_restart_call_prepare(task); 7695 return; 7696 } 7697 dprintk("<-- %s\n", __func__); 7698 } 7699 7700 static void nfs4_free_reclaim_complete_data(void *data) 7701 { 7702 struct nfs4_reclaim_complete_data *calldata = data; 7703 7704 kfree(calldata); 7705 } 7706 7707 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 7708 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 7709 .rpc_call_done = nfs4_reclaim_complete_done, 7710 .rpc_release = nfs4_free_reclaim_complete_data, 7711 }; 7712 7713 /* 7714 * Issue a global reclaim complete. 7715 */ 7716 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 7717 struct rpc_cred *cred) 7718 { 7719 struct nfs4_reclaim_complete_data *calldata; 7720 struct rpc_task *task; 7721 struct rpc_message msg = { 7722 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 7723 .rpc_cred = cred, 7724 }; 7725 struct rpc_task_setup task_setup_data = { 7726 .rpc_client = clp->cl_rpcclient, 7727 .rpc_message = &msg, 7728 .callback_ops = &nfs4_reclaim_complete_call_ops, 7729 .flags = RPC_TASK_ASYNC, 7730 }; 7731 int status = -ENOMEM; 7732 7733 dprintk("--> %s\n", __func__); 7734 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7735 if (calldata == NULL) 7736 goto out; 7737 calldata->clp = clp; 7738 calldata->arg.one_fs = 0; 7739 7740 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 7741 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 7742 msg.rpc_argp = &calldata->arg; 7743 msg.rpc_resp = &calldata->res; 7744 task_setup_data.callback_data = calldata; 7745 task = rpc_run_task(&task_setup_data); 7746 if (IS_ERR(task)) { 7747 status = PTR_ERR(task); 7748 goto out; 7749 } 7750 status = nfs4_wait_for_completion_rpc_task(task); 7751 if (status == 0) 7752 status = task->tk_status; 7753 rpc_put_task(task); 7754 return 0; 7755 out: 7756 dprintk("<-- %s status=%d\n", __func__, status); 7757 return status; 7758 } 7759 7760 static void 7761 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 7762 { 7763 struct nfs4_layoutget *lgp = calldata; 7764 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 7765 struct nfs4_session *session = nfs4_get_session(server); 7766 7767 dprintk("--> %s\n", __func__); 7768 /* Note the is a race here, where a CB_LAYOUTRECALL can come in 7769 * right now covering the LAYOUTGET we are about to send. 7770 * However, that is not so catastrophic, and there seems 7771 * to be no way to prevent it completely. 7772 */ 7773 if (nfs41_setup_sequence(session, &lgp->args.seq_args, 7774 &lgp->res.seq_res, task)) 7775 return; 7776 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid, 7777 NFS_I(lgp->args.inode)->layout, 7778 &lgp->args.range, 7779 lgp->args.ctx->state)) { 7780 rpc_exit(task, NFS4_OK); 7781 } 7782 } 7783 7784 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 7785 { 7786 struct nfs4_layoutget *lgp = calldata; 7787 struct inode *inode = lgp->args.inode; 7788 struct nfs_server *server = NFS_SERVER(inode); 7789 struct pnfs_layout_hdr *lo; 7790 struct nfs4_state *state = NULL; 7791 unsigned long timeo, now, giveup; 7792 7793 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 7794 7795 if (!nfs41_sequence_done(task, &lgp->res.seq_res)) 7796 goto out; 7797 7798 switch (task->tk_status) { 7799 case 0: 7800 goto out; 7801 /* 7802 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 7803 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 7804 */ 7805 case -NFS4ERR_BADLAYOUT: 7806 goto out_overflow; 7807 /* 7808 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 7809 * (or clients) writing to the same RAID stripe except when 7810 * the minlength argument is 0 (see RFC5661 section 18.43.3). 7811 */ 7812 case -NFS4ERR_LAYOUTTRYLATER: 7813 if (lgp->args.minlength == 0) 7814 goto out_overflow; 7815 /* 7816 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall 7817 * existing layout before getting a new one). 7818 */ 7819 case -NFS4ERR_RECALLCONFLICT: 7820 timeo = rpc_get_timeout(task->tk_client); 7821 giveup = lgp->args.timestamp + timeo; 7822 now = jiffies; 7823 if (time_after(giveup, now)) { 7824 unsigned long delay; 7825 7826 /* Delay for: 7827 * - Not less then NFS4_POLL_RETRY_MIN. 7828 * - One last time a jiffie before we give up 7829 * - exponential backoff (time_now minus start_attempt) 7830 */ 7831 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN, 7832 min((giveup - now - 1), 7833 now - lgp->args.timestamp)); 7834 7835 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n", 7836 __func__, delay); 7837 rpc_delay(task, delay); 7838 /* Do not call nfs4_async_handle_error() */ 7839 goto out_restart; 7840 } 7841 break; 7842 case -NFS4ERR_EXPIRED: 7843 case -NFS4ERR_BAD_STATEID: 7844 spin_lock(&inode->i_lock); 7845 if (nfs4_stateid_match(&lgp->args.stateid, 7846 &lgp->args.ctx->state->stateid)) { 7847 spin_unlock(&inode->i_lock); 7848 /* If the open stateid was bad, then recover it. */ 7849 state = lgp->args.ctx->state; 7850 break; 7851 } 7852 lo = NFS_I(inode)->layout; 7853 if (lo && nfs4_stateid_match(&lgp->args.stateid, 7854 &lo->plh_stateid)) { 7855 LIST_HEAD(head); 7856 7857 /* 7858 * Mark the bad layout state as invalid, then retry 7859 * with the current stateid. 7860 */ 7861 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 7862 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL); 7863 spin_unlock(&inode->i_lock); 7864 pnfs_free_lseg_list(&head); 7865 } else 7866 spin_unlock(&inode->i_lock); 7867 goto out_restart; 7868 } 7869 if (nfs4_async_handle_error(task, server, state, &lgp->timeout) == -EAGAIN) 7870 goto out_restart; 7871 out: 7872 dprintk("<-- %s\n", __func__); 7873 return; 7874 out_restart: 7875 task->tk_status = 0; 7876 rpc_restart_call_prepare(task); 7877 return; 7878 out_overflow: 7879 task->tk_status = -EOVERFLOW; 7880 goto out; 7881 } 7882 7883 static size_t max_response_pages(struct nfs_server *server) 7884 { 7885 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 7886 return nfs_page_array_len(0, max_resp_sz); 7887 } 7888 7889 static void nfs4_free_pages(struct page **pages, size_t size) 7890 { 7891 int i; 7892 7893 if (!pages) 7894 return; 7895 7896 for (i = 0; i < size; i++) { 7897 if (!pages[i]) 7898 break; 7899 __free_page(pages[i]); 7900 } 7901 kfree(pages); 7902 } 7903 7904 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 7905 { 7906 struct page **pages; 7907 int i; 7908 7909 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 7910 if (!pages) { 7911 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 7912 return NULL; 7913 } 7914 7915 for (i = 0; i < size; i++) { 7916 pages[i] = alloc_page(gfp_flags); 7917 if (!pages[i]) { 7918 dprintk("%s: failed to allocate page\n", __func__); 7919 nfs4_free_pages(pages, size); 7920 return NULL; 7921 } 7922 } 7923 7924 return pages; 7925 } 7926 7927 static void nfs4_layoutget_release(void *calldata) 7928 { 7929 struct nfs4_layoutget *lgp = calldata; 7930 struct inode *inode = lgp->args.inode; 7931 struct nfs_server *server = NFS_SERVER(inode); 7932 size_t max_pages = max_response_pages(server); 7933 7934 dprintk("--> %s\n", __func__); 7935 nfs4_free_pages(lgp->args.layout.pages, max_pages); 7936 pnfs_put_layout_hdr(NFS_I(inode)->layout); 7937 put_nfs_open_context(lgp->args.ctx); 7938 kfree(calldata); 7939 dprintk("<-- %s\n", __func__); 7940 } 7941 7942 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 7943 .rpc_call_prepare = nfs4_layoutget_prepare, 7944 .rpc_call_done = nfs4_layoutget_done, 7945 .rpc_release = nfs4_layoutget_release, 7946 }; 7947 7948 struct pnfs_layout_segment * 7949 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) 7950 { 7951 struct inode *inode = lgp->args.inode; 7952 struct nfs_server *server = NFS_SERVER(inode); 7953 size_t max_pages = max_response_pages(server); 7954 struct rpc_task *task; 7955 struct rpc_message msg = { 7956 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 7957 .rpc_argp = &lgp->args, 7958 .rpc_resp = &lgp->res, 7959 .rpc_cred = lgp->cred, 7960 }; 7961 struct rpc_task_setup task_setup_data = { 7962 .rpc_client = server->client, 7963 .rpc_message = &msg, 7964 .callback_ops = &nfs4_layoutget_call_ops, 7965 .callback_data = lgp, 7966 .flags = RPC_TASK_ASYNC, 7967 }; 7968 struct pnfs_layout_segment *lseg = NULL; 7969 int status = 0; 7970 7971 dprintk("--> %s\n", __func__); 7972 7973 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 7974 pnfs_get_layout_hdr(NFS_I(inode)->layout); 7975 7976 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 7977 if (!lgp->args.layout.pages) { 7978 nfs4_layoutget_release(lgp); 7979 return ERR_PTR(-ENOMEM); 7980 } 7981 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 7982 lgp->args.timestamp = jiffies; 7983 7984 lgp->res.layoutp = &lgp->args.layout; 7985 lgp->res.seq_res.sr_slot = NULL; 7986 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 7987 7988 task = rpc_run_task(&task_setup_data); 7989 if (IS_ERR(task)) 7990 return ERR_CAST(task); 7991 status = nfs4_wait_for_completion_rpc_task(task); 7992 if (status == 0) 7993 status = task->tk_status; 7994 trace_nfs4_layoutget(lgp->args.ctx, 7995 &lgp->args.range, 7996 &lgp->res.range, 7997 status); 7998 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 7999 if (status == 0 && lgp->res.layoutp->len) 8000 lseg = pnfs_layout_process(lgp); 8001 rpc_put_task(task); 8002 dprintk("<-- %s status=%d\n", __func__, status); 8003 if (status) 8004 return ERR_PTR(status); 8005 return lseg; 8006 } 8007 8008 static void 8009 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 8010 { 8011 struct nfs4_layoutreturn *lrp = calldata; 8012 8013 dprintk("--> %s\n", __func__); 8014 nfs41_setup_sequence(lrp->clp->cl_session, 8015 &lrp->args.seq_args, 8016 &lrp->res.seq_res, 8017 task); 8018 } 8019 8020 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 8021 { 8022 struct nfs4_layoutreturn *lrp = calldata; 8023 struct nfs_server *server; 8024 8025 dprintk("--> %s\n", __func__); 8026 8027 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 8028 return; 8029 8030 server = NFS_SERVER(lrp->args.inode); 8031 switch (task->tk_status) { 8032 default: 8033 task->tk_status = 0; 8034 case 0: 8035 break; 8036 case -NFS4ERR_DELAY: 8037 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 8038 break; 8039 rpc_restart_call_prepare(task); 8040 return; 8041 } 8042 dprintk("<-- %s\n", __func__); 8043 } 8044 8045 static void nfs4_layoutreturn_release(void *calldata) 8046 { 8047 struct nfs4_layoutreturn *lrp = calldata; 8048 struct pnfs_layout_hdr *lo = lrp->args.layout; 8049 LIST_HEAD(freeme); 8050 8051 dprintk("--> %s\n", __func__); 8052 spin_lock(&lo->plh_inode->i_lock); 8053 if (lrp->res.lrs_present) 8054 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 8055 pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range); 8056 pnfs_clear_layoutreturn_waitbit(lo); 8057 lo->plh_block_lgets--; 8058 spin_unlock(&lo->plh_inode->i_lock); 8059 pnfs_free_lseg_list(&freeme); 8060 pnfs_put_layout_hdr(lrp->args.layout); 8061 nfs_iput_and_deactive(lrp->inode); 8062 kfree(calldata); 8063 dprintk("<-- %s\n", __func__); 8064 } 8065 8066 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 8067 .rpc_call_prepare = nfs4_layoutreturn_prepare, 8068 .rpc_call_done = nfs4_layoutreturn_done, 8069 .rpc_release = nfs4_layoutreturn_release, 8070 }; 8071 8072 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 8073 { 8074 struct rpc_task *task; 8075 struct rpc_message msg = { 8076 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 8077 .rpc_argp = &lrp->args, 8078 .rpc_resp = &lrp->res, 8079 .rpc_cred = lrp->cred, 8080 }; 8081 struct rpc_task_setup task_setup_data = { 8082 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 8083 .rpc_message = &msg, 8084 .callback_ops = &nfs4_layoutreturn_call_ops, 8085 .callback_data = lrp, 8086 }; 8087 int status = 0; 8088 8089 dprintk("--> %s\n", __func__); 8090 if (!sync) { 8091 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 8092 if (!lrp->inode) { 8093 nfs4_layoutreturn_release(lrp); 8094 return -EAGAIN; 8095 } 8096 task_setup_data.flags |= RPC_TASK_ASYNC; 8097 } 8098 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 8099 task = rpc_run_task(&task_setup_data); 8100 if (IS_ERR(task)) 8101 return PTR_ERR(task); 8102 if (sync) 8103 status = task->tk_status; 8104 trace_nfs4_layoutreturn(lrp->args.inode, status); 8105 dprintk("<-- %s status=%d\n", __func__, status); 8106 rpc_put_task(task); 8107 return status; 8108 } 8109 8110 static int 8111 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 8112 struct pnfs_device *pdev, 8113 struct rpc_cred *cred) 8114 { 8115 struct nfs4_getdeviceinfo_args args = { 8116 .pdev = pdev, 8117 .notify_types = NOTIFY_DEVICEID4_CHANGE | 8118 NOTIFY_DEVICEID4_DELETE, 8119 }; 8120 struct nfs4_getdeviceinfo_res res = { 8121 .pdev = pdev, 8122 }; 8123 struct rpc_message msg = { 8124 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 8125 .rpc_argp = &args, 8126 .rpc_resp = &res, 8127 .rpc_cred = cred, 8128 }; 8129 int status; 8130 8131 dprintk("--> %s\n", __func__); 8132 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 8133 if (res.notification & ~args.notify_types) 8134 dprintk("%s: unsupported notification\n", __func__); 8135 if (res.notification != args.notify_types) 8136 pdev->nocache = 1; 8137 8138 dprintk("<-- %s status=%d\n", __func__, status); 8139 8140 return status; 8141 } 8142 8143 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 8144 struct pnfs_device *pdev, 8145 struct rpc_cred *cred) 8146 { 8147 struct nfs4_exception exception = { }; 8148 int err; 8149 8150 do { 8151 err = nfs4_handle_exception(server, 8152 _nfs4_proc_getdeviceinfo(server, pdev, cred), 8153 &exception); 8154 } while (exception.retry); 8155 return err; 8156 } 8157 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 8158 8159 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 8160 { 8161 struct nfs4_layoutcommit_data *data = calldata; 8162 struct nfs_server *server = NFS_SERVER(data->args.inode); 8163 struct nfs4_session *session = nfs4_get_session(server); 8164 8165 nfs41_setup_sequence(session, 8166 &data->args.seq_args, 8167 &data->res.seq_res, 8168 task); 8169 } 8170 8171 static void 8172 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 8173 { 8174 struct nfs4_layoutcommit_data *data = calldata; 8175 struct nfs_server *server = NFS_SERVER(data->args.inode); 8176 8177 if (!nfs41_sequence_done(task, &data->res.seq_res)) 8178 return; 8179 8180 switch (task->tk_status) { /* Just ignore these failures */ 8181 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 8182 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 8183 case -NFS4ERR_BADLAYOUT: /* no layout */ 8184 case -NFS4ERR_GRACE: /* loca_recalim always false */ 8185 task->tk_status = 0; 8186 case 0: 8187 break; 8188 default: 8189 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 8190 rpc_restart_call_prepare(task); 8191 return; 8192 } 8193 } 8194 } 8195 8196 static void nfs4_layoutcommit_release(void *calldata) 8197 { 8198 struct nfs4_layoutcommit_data *data = calldata; 8199 8200 pnfs_cleanup_layoutcommit(data); 8201 nfs_post_op_update_inode_force_wcc(data->args.inode, 8202 data->res.fattr); 8203 put_rpccred(data->cred); 8204 nfs_iput_and_deactive(data->inode); 8205 kfree(data); 8206 } 8207 8208 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 8209 .rpc_call_prepare = nfs4_layoutcommit_prepare, 8210 .rpc_call_done = nfs4_layoutcommit_done, 8211 .rpc_release = nfs4_layoutcommit_release, 8212 }; 8213 8214 int 8215 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 8216 { 8217 struct rpc_message msg = { 8218 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 8219 .rpc_argp = &data->args, 8220 .rpc_resp = &data->res, 8221 .rpc_cred = data->cred, 8222 }; 8223 struct rpc_task_setup task_setup_data = { 8224 .task = &data->task, 8225 .rpc_client = NFS_CLIENT(data->args.inode), 8226 .rpc_message = &msg, 8227 .callback_ops = &nfs4_layoutcommit_ops, 8228 .callback_data = data, 8229 }; 8230 struct rpc_task *task; 8231 int status = 0; 8232 8233 dprintk("NFS: initiating layoutcommit call. sync %d " 8234 "lbw: %llu inode %lu\n", sync, 8235 data->args.lastbytewritten, 8236 data->args.inode->i_ino); 8237 8238 if (!sync) { 8239 data->inode = nfs_igrab_and_active(data->args.inode); 8240 if (data->inode == NULL) { 8241 nfs4_layoutcommit_release(data); 8242 return -EAGAIN; 8243 } 8244 task_setup_data.flags = RPC_TASK_ASYNC; 8245 } 8246 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 8247 task = rpc_run_task(&task_setup_data); 8248 if (IS_ERR(task)) 8249 return PTR_ERR(task); 8250 if (sync) 8251 status = task->tk_status; 8252 trace_nfs4_layoutcommit(data->args.inode, status); 8253 dprintk("%s: status %d\n", __func__, status); 8254 rpc_put_task(task); 8255 return status; 8256 } 8257 8258 /** 8259 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 8260 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 8261 */ 8262 static int 8263 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 8264 struct nfs_fsinfo *info, 8265 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8266 { 8267 struct nfs41_secinfo_no_name_args args = { 8268 .style = SECINFO_STYLE_CURRENT_FH, 8269 }; 8270 struct nfs4_secinfo_res res = { 8271 .flavors = flavors, 8272 }; 8273 struct rpc_message msg = { 8274 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 8275 .rpc_argp = &args, 8276 .rpc_resp = &res, 8277 }; 8278 struct rpc_clnt *clnt = server->client; 8279 struct rpc_cred *cred = NULL; 8280 int status; 8281 8282 if (use_integrity) { 8283 clnt = server->nfs_client->cl_rpcclient; 8284 cred = nfs4_get_clid_cred(server->nfs_client); 8285 msg.rpc_cred = cred; 8286 } 8287 8288 dprintk("--> %s\n", __func__); 8289 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 8290 &res.seq_res, 0); 8291 dprintk("<-- %s status=%d\n", __func__, status); 8292 8293 if (cred) 8294 put_rpccred(cred); 8295 8296 return status; 8297 } 8298 8299 static int 8300 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 8301 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 8302 { 8303 struct nfs4_exception exception = { }; 8304 int err; 8305 do { 8306 /* first try using integrity protection */ 8307 err = -NFS4ERR_WRONGSEC; 8308 8309 /* try to use integrity protection with machine cred */ 8310 if (_nfs4_is_integrity_protected(server->nfs_client)) 8311 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8312 flavors, true); 8313 8314 /* 8315 * if unable to use integrity protection, or SECINFO with 8316 * integrity protection returns NFS4ERR_WRONGSEC (which is 8317 * disallowed by spec, but exists in deployed servers) use 8318 * the current filesystem's rpc_client and the user cred. 8319 */ 8320 if (err == -NFS4ERR_WRONGSEC) 8321 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8322 flavors, false); 8323 8324 switch (err) { 8325 case 0: 8326 case -NFS4ERR_WRONGSEC: 8327 case -ENOTSUPP: 8328 goto out; 8329 default: 8330 err = nfs4_handle_exception(server, err, &exception); 8331 } 8332 } while (exception.retry); 8333 out: 8334 return err; 8335 } 8336 8337 static int 8338 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 8339 struct nfs_fsinfo *info) 8340 { 8341 int err; 8342 struct page *page; 8343 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 8344 struct nfs4_secinfo_flavors *flavors; 8345 struct nfs4_secinfo4 *secinfo; 8346 int i; 8347 8348 page = alloc_page(GFP_KERNEL); 8349 if (!page) { 8350 err = -ENOMEM; 8351 goto out; 8352 } 8353 8354 flavors = page_address(page); 8355 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 8356 8357 /* 8358 * Fall back on "guess and check" method if 8359 * the server doesn't support SECINFO_NO_NAME 8360 */ 8361 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 8362 err = nfs4_find_root_sec(server, fhandle, info); 8363 goto out_freepage; 8364 } 8365 if (err) 8366 goto out_freepage; 8367 8368 for (i = 0; i < flavors->num_flavors; i++) { 8369 secinfo = &flavors->flavors[i]; 8370 8371 switch (secinfo->flavor) { 8372 case RPC_AUTH_NULL: 8373 case RPC_AUTH_UNIX: 8374 case RPC_AUTH_GSS: 8375 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 8376 &secinfo->flavor_info); 8377 break; 8378 default: 8379 flavor = RPC_AUTH_MAXFLAVOR; 8380 break; 8381 } 8382 8383 if (!nfs_auth_info_match(&server->auth_info, flavor)) 8384 flavor = RPC_AUTH_MAXFLAVOR; 8385 8386 if (flavor != RPC_AUTH_MAXFLAVOR) { 8387 err = nfs4_lookup_root_sec(server, fhandle, 8388 info, flavor); 8389 if (!err) 8390 break; 8391 } 8392 } 8393 8394 if (flavor == RPC_AUTH_MAXFLAVOR) 8395 err = -EPERM; 8396 8397 out_freepage: 8398 put_page(page); 8399 if (err == -EACCES) 8400 return -EPERM; 8401 out: 8402 return err; 8403 } 8404 8405 static int _nfs41_test_stateid(struct nfs_server *server, 8406 nfs4_stateid *stateid, 8407 struct rpc_cred *cred) 8408 { 8409 int status; 8410 struct nfs41_test_stateid_args args = { 8411 .stateid = stateid, 8412 }; 8413 struct nfs41_test_stateid_res res; 8414 struct rpc_message msg = { 8415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 8416 .rpc_argp = &args, 8417 .rpc_resp = &res, 8418 .rpc_cred = cred, 8419 }; 8420 struct rpc_clnt *rpc_client = server->client; 8421 8422 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8423 &rpc_client, &msg); 8424 8425 dprintk("NFS call test_stateid %p\n", stateid); 8426 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 8427 nfs4_set_sequence_privileged(&args.seq_args); 8428 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 8429 &args.seq_args, &res.seq_res); 8430 if (status != NFS_OK) { 8431 dprintk("NFS reply test_stateid: failed, %d\n", status); 8432 return status; 8433 } 8434 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 8435 return -res.status; 8436 } 8437 8438 /** 8439 * nfs41_test_stateid - perform a TEST_STATEID operation 8440 * 8441 * @server: server / transport on which to perform the operation 8442 * @stateid: state ID to test 8443 * @cred: credential 8444 * 8445 * Returns NFS_OK if the server recognizes that "stateid" is valid. 8446 * Otherwise a negative NFS4ERR value is returned if the operation 8447 * failed or the state ID is not currently valid. 8448 */ 8449 static int nfs41_test_stateid(struct nfs_server *server, 8450 nfs4_stateid *stateid, 8451 struct rpc_cred *cred) 8452 { 8453 struct nfs4_exception exception = { }; 8454 int err; 8455 do { 8456 err = _nfs41_test_stateid(server, stateid, cred); 8457 if (err != -NFS4ERR_DELAY) 8458 break; 8459 nfs4_handle_exception(server, err, &exception); 8460 } while (exception.retry); 8461 return err; 8462 } 8463 8464 struct nfs_free_stateid_data { 8465 struct nfs_server *server; 8466 struct nfs41_free_stateid_args args; 8467 struct nfs41_free_stateid_res res; 8468 }; 8469 8470 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 8471 { 8472 struct nfs_free_stateid_data *data = calldata; 8473 nfs41_setup_sequence(nfs4_get_session(data->server), 8474 &data->args.seq_args, 8475 &data->res.seq_res, 8476 task); 8477 } 8478 8479 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 8480 { 8481 struct nfs_free_stateid_data *data = calldata; 8482 8483 nfs41_sequence_done(task, &data->res.seq_res); 8484 8485 switch (task->tk_status) { 8486 case -NFS4ERR_DELAY: 8487 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 8488 rpc_restart_call_prepare(task); 8489 } 8490 } 8491 8492 static void nfs41_free_stateid_release(void *calldata) 8493 { 8494 kfree(calldata); 8495 } 8496 8497 static const struct rpc_call_ops nfs41_free_stateid_ops = { 8498 .rpc_call_prepare = nfs41_free_stateid_prepare, 8499 .rpc_call_done = nfs41_free_stateid_done, 8500 .rpc_release = nfs41_free_stateid_release, 8501 }; 8502 8503 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 8504 nfs4_stateid *stateid, 8505 struct rpc_cred *cred, 8506 bool privileged) 8507 { 8508 struct rpc_message msg = { 8509 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 8510 .rpc_cred = cred, 8511 }; 8512 struct rpc_task_setup task_setup = { 8513 .rpc_client = server->client, 8514 .rpc_message = &msg, 8515 .callback_ops = &nfs41_free_stateid_ops, 8516 .flags = RPC_TASK_ASYNC, 8517 }; 8518 struct nfs_free_stateid_data *data; 8519 8520 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8521 &task_setup.rpc_client, &msg); 8522 8523 dprintk("NFS call free_stateid %p\n", stateid); 8524 data = kmalloc(sizeof(*data), GFP_NOFS); 8525 if (!data) 8526 return ERR_PTR(-ENOMEM); 8527 data->server = server; 8528 nfs4_stateid_copy(&data->args.stateid, stateid); 8529 8530 task_setup.callback_data = data; 8531 8532 msg.rpc_argp = &data->args; 8533 msg.rpc_resp = &data->res; 8534 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 8535 if (privileged) 8536 nfs4_set_sequence_privileged(&data->args.seq_args); 8537 8538 return rpc_run_task(&task_setup); 8539 } 8540 8541 /** 8542 * nfs41_free_stateid - perform a FREE_STATEID operation 8543 * 8544 * @server: server / transport on which to perform the operation 8545 * @stateid: state ID to release 8546 * @cred: credential 8547 * 8548 * Returns NFS_OK if the server freed "stateid". Otherwise a 8549 * negative NFS4ERR value is returned. 8550 */ 8551 static int nfs41_free_stateid(struct nfs_server *server, 8552 nfs4_stateid *stateid, 8553 struct rpc_cred *cred) 8554 { 8555 struct rpc_task *task; 8556 int ret; 8557 8558 task = _nfs41_free_stateid(server, stateid, cred, true); 8559 if (IS_ERR(task)) 8560 return PTR_ERR(task); 8561 ret = rpc_wait_for_completion_task(task); 8562 if (!ret) 8563 ret = task->tk_status; 8564 rpc_put_task(task); 8565 return ret; 8566 } 8567 8568 static void 8569 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 8570 { 8571 struct rpc_task *task; 8572 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 8573 8574 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 8575 nfs4_free_lock_state(server, lsp); 8576 if (IS_ERR(task)) 8577 return; 8578 rpc_put_task(task); 8579 } 8580 8581 static bool nfs41_match_stateid(const nfs4_stateid *s1, 8582 const nfs4_stateid *s2) 8583 { 8584 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 8585 return false; 8586 8587 if (s1->seqid == s2->seqid) 8588 return true; 8589 if (s1->seqid == 0 || s2->seqid == 0) 8590 return true; 8591 8592 return false; 8593 } 8594 8595 #endif /* CONFIG_NFS_V4_1 */ 8596 8597 static bool nfs4_match_stateid(const nfs4_stateid *s1, 8598 const nfs4_stateid *s2) 8599 { 8600 return nfs4_stateid_match(s1, s2); 8601 } 8602 8603 8604 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 8605 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8606 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8607 .recover_open = nfs4_open_reclaim, 8608 .recover_lock = nfs4_lock_reclaim, 8609 .establish_clid = nfs4_init_clientid, 8610 .detect_trunking = nfs40_discover_server_trunking, 8611 }; 8612 8613 #if defined(CONFIG_NFS_V4_1) 8614 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 8615 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8616 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8617 .recover_open = nfs4_open_reclaim, 8618 .recover_lock = nfs4_lock_reclaim, 8619 .establish_clid = nfs41_init_clientid, 8620 .reclaim_complete = nfs41_proc_reclaim_complete, 8621 .detect_trunking = nfs41_discover_server_trunking, 8622 }; 8623 #endif /* CONFIG_NFS_V4_1 */ 8624 8625 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 8626 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8627 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8628 .recover_open = nfs40_open_expired, 8629 .recover_lock = nfs4_lock_expired, 8630 .establish_clid = nfs4_init_clientid, 8631 }; 8632 8633 #if defined(CONFIG_NFS_V4_1) 8634 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 8635 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8636 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8637 .recover_open = nfs41_open_expired, 8638 .recover_lock = nfs41_lock_expired, 8639 .establish_clid = nfs41_init_clientid, 8640 }; 8641 #endif /* CONFIG_NFS_V4_1 */ 8642 8643 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 8644 .sched_state_renewal = nfs4_proc_async_renew, 8645 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 8646 .renew_lease = nfs4_proc_renew, 8647 }; 8648 8649 #if defined(CONFIG_NFS_V4_1) 8650 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 8651 .sched_state_renewal = nfs41_proc_async_sequence, 8652 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 8653 .renew_lease = nfs4_proc_sequence, 8654 }; 8655 #endif 8656 8657 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 8658 .get_locations = _nfs40_proc_get_locations, 8659 .fsid_present = _nfs40_proc_fsid_present, 8660 }; 8661 8662 #if defined(CONFIG_NFS_V4_1) 8663 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 8664 .get_locations = _nfs41_proc_get_locations, 8665 .fsid_present = _nfs41_proc_fsid_present, 8666 }; 8667 #endif /* CONFIG_NFS_V4_1 */ 8668 8669 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 8670 .minor_version = 0, 8671 .init_caps = NFS_CAP_READDIRPLUS 8672 | NFS_CAP_ATOMIC_OPEN 8673 | NFS_CAP_POSIX_LOCK, 8674 .init_client = nfs40_init_client, 8675 .shutdown_client = nfs40_shutdown_client, 8676 .match_stateid = nfs4_match_stateid, 8677 .find_root_sec = nfs4_find_root_sec, 8678 .free_lock_state = nfs4_release_lockowner, 8679 .alloc_seqid = nfs_alloc_seqid, 8680 .call_sync_ops = &nfs40_call_sync_ops, 8681 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 8682 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 8683 .state_renewal_ops = &nfs40_state_renewal_ops, 8684 .mig_recovery_ops = &nfs40_mig_recovery_ops, 8685 }; 8686 8687 #if defined(CONFIG_NFS_V4_1) 8688 static struct nfs_seqid * 8689 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 8690 { 8691 return NULL; 8692 } 8693 8694 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 8695 .minor_version = 1, 8696 .init_caps = NFS_CAP_READDIRPLUS 8697 | NFS_CAP_ATOMIC_OPEN 8698 | NFS_CAP_POSIX_LOCK 8699 | NFS_CAP_STATEID_NFSV41 8700 | NFS_CAP_ATOMIC_OPEN_V1, 8701 .init_client = nfs41_init_client, 8702 .shutdown_client = nfs41_shutdown_client, 8703 .match_stateid = nfs41_match_stateid, 8704 .find_root_sec = nfs41_find_root_sec, 8705 .free_lock_state = nfs41_free_lock_state, 8706 .alloc_seqid = nfs_alloc_no_seqid, 8707 .call_sync_ops = &nfs41_call_sync_ops, 8708 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8709 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8710 .state_renewal_ops = &nfs41_state_renewal_ops, 8711 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8712 }; 8713 #endif 8714 8715 #if defined(CONFIG_NFS_V4_2) 8716 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 8717 .minor_version = 2, 8718 .init_caps = NFS_CAP_READDIRPLUS 8719 | NFS_CAP_ATOMIC_OPEN 8720 | NFS_CAP_POSIX_LOCK 8721 | NFS_CAP_STATEID_NFSV41 8722 | NFS_CAP_ATOMIC_OPEN_V1 8723 | NFS_CAP_ALLOCATE 8724 | NFS_CAP_DEALLOCATE 8725 | NFS_CAP_SEEK 8726 | NFS_CAP_LAYOUTSTATS 8727 | NFS_CAP_CLONE, 8728 .init_client = nfs41_init_client, 8729 .shutdown_client = nfs41_shutdown_client, 8730 .match_stateid = nfs41_match_stateid, 8731 .find_root_sec = nfs41_find_root_sec, 8732 .free_lock_state = nfs41_free_lock_state, 8733 .call_sync_ops = &nfs41_call_sync_ops, 8734 .alloc_seqid = nfs_alloc_no_seqid, 8735 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8736 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8737 .state_renewal_ops = &nfs41_state_renewal_ops, 8738 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8739 }; 8740 #endif 8741 8742 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 8743 [0] = &nfs_v4_0_minor_ops, 8744 #if defined(CONFIG_NFS_V4_1) 8745 [1] = &nfs_v4_1_minor_ops, 8746 #endif 8747 #if defined(CONFIG_NFS_V4_2) 8748 [2] = &nfs_v4_2_minor_ops, 8749 #endif 8750 }; 8751 8752 static const struct inode_operations nfs4_dir_inode_operations = { 8753 .create = nfs_create, 8754 .lookup = nfs_lookup, 8755 .atomic_open = nfs_atomic_open, 8756 .link = nfs_link, 8757 .unlink = nfs_unlink, 8758 .symlink = nfs_symlink, 8759 .mkdir = nfs_mkdir, 8760 .rmdir = nfs_rmdir, 8761 .mknod = nfs_mknod, 8762 .rename = nfs_rename, 8763 .permission = nfs_permission, 8764 .getattr = nfs_getattr, 8765 .setattr = nfs_setattr, 8766 .getxattr = generic_getxattr, 8767 .setxattr = generic_setxattr, 8768 .listxattr = generic_listxattr, 8769 .removexattr = generic_removexattr, 8770 }; 8771 8772 static const struct inode_operations nfs4_file_inode_operations = { 8773 .permission = nfs_permission, 8774 .getattr = nfs_getattr, 8775 .setattr = nfs_setattr, 8776 .getxattr = generic_getxattr, 8777 .setxattr = generic_setxattr, 8778 .listxattr = generic_listxattr, 8779 .removexattr = generic_removexattr, 8780 }; 8781 8782 const struct nfs_rpc_ops nfs_v4_clientops = { 8783 .version = 4, /* protocol version */ 8784 .dentry_ops = &nfs4_dentry_operations, 8785 .dir_inode_ops = &nfs4_dir_inode_operations, 8786 .file_inode_ops = &nfs4_file_inode_operations, 8787 .file_ops = &nfs4_file_operations, 8788 .getroot = nfs4_proc_get_root, 8789 .submount = nfs4_submount, 8790 .try_mount = nfs4_try_mount, 8791 .getattr = nfs4_proc_getattr, 8792 .setattr = nfs4_proc_setattr, 8793 .lookup = nfs4_proc_lookup, 8794 .access = nfs4_proc_access, 8795 .readlink = nfs4_proc_readlink, 8796 .create = nfs4_proc_create, 8797 .remove = nfs4_proc_remove, 8798 .unlink_setup = nfs4_proc_unlink_setup, 8799 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 8800 .unlink_done = nfs4_proc_unlink_done, 8801 .rename_setup = nfs4_proc_rename_setup, 8802 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 8803 .rename_done = nfs4_proc_rename_done, 8804 .link = nfs4_proc_link, 8805 .symlink = nfs4_proc_symlink, 8806 .mkdir = nfs4_proc_mkdir, 8807 .rmdir = nfs4_proc_remove, 8808 .readdir = nfs4_proc_readdir, 8809 .mknod = nfs4_proc_mknod, 8810 .statfs = nfs4_proc_statfs, 8811 .fsinfo = nfs4_proc_fsinfo, 8812 .pathconf = nfs4_proc_pathconf, 8813 .set_capabilities = nfs4_server_capabilities, 8814 .decode_dirent = nfs4_decode_dirent, 8815 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 8816 .read_setup = nfs4_proc_read_setup, 8817 .read_done = nfs4_read_done, 8818 .write_setup = nfs4_proc_write_setup, 8819 .write_done = nfs4_write_done, 8820 .commit_setup = nfs4_proc_commit_setup, 8821 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 8822 .commit_done = nfs4_commit_done, 8823 .lock = nfs4_proc_lock, 8824 .clear_acl_cache = nfs4_zap_acl_attr, 8825 .close_context = nfs4_close_context, 8826 .open_context = nfs4_atomic_open, 8827 .have_delegation = nfs4_have_delegation, 8828 .return_delegation = nfs4_inode_return_delegation, 8829 .alloc_client = nfs4_alloc_client, 8830 .init_client = nfs4_init_client, 8831 .free_client = nfs4_free_client, 8832 .create_server = nfs4_create_server, 8833 .clone_server = nfs_clone_server, 8834 }; 8835 8836 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 8837 .prefix = XATTR_NAME_NFSV4_ACL, 8838 .list = nfs4_xattr_list_nfs4_acl, 8839 .get = nfs4_xattr_get_nfs4_acl, 8840 .set = nfs4_xattr_set_nfs4_acl, 8841 }; 8842 8843 const struct xattr_handler *nfs4_xattr_handlers[] = { 8844 &nfs4_xattr_nfs4_acl_handler, 8845 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 8846 &nfs4_xattr_nfs4_label_handler, 8847 #endif 8848 NULL 8849 }; 8850 8851 /* 8852 * Local variables: 8853 * c-basic-offset: 8 8854 * End: 8855 */ 8856