1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/nfs_idmap.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 "nfs4session.h" 67 #include "fscache.h" 68 69 #include "nfs4trace.h" 70 71 #define NFSDBG_FACILITY NFSDBG_PROC 72 73 #define NFS4_POLL_RETRY_MIN (HZ/10) 74 #define NFS4_POLL_RETRY_MAX (15*HZ) 75 76 struct nfs4_opendata; 77 static int _nfs4_proc_open(struct nfs4_opendata *data); 78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *); 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_ACCESS: 162 return -EACCES; 163 case -NFS4ERR_FILE_OPEN: 164 return -EBUSY; 165 default: 166 dprintk("%s could not handle NFSv4 error %d\n", 167 __func__, -err); 168 break; 169 } 170 return -EIO; 171 } 172 173 /* 174 * This is our standard bitmap for GETATTR requests. 175 */ 176 const u32 nfs4_fattr_bitmap[3] = { 177 FATTR4_WORD0_TYPE 178 | FATTR4_WORD0_CHANGE 179 | FATTR4_WORD0_SIZE 180 | FATTR4_WORD0_FSID 181 | FATTR4_WORD0_FILEID, 182 FATTR4_WORD1_MODE 183 | FATTR4_WORD1_NUMLINKS 184 | FATTR4_WORD1_OWNER 185 | FATTR4_WORD1_OWNER_GROUP 186 | FATTR4_WORD1_RAWDEV 187 | FATTR4_WORD1_SPACE_USED 188 | FATTR4_WORD1_TIME_ACCESS 189 | FATTR4_WORD1_TIME_METADATA 190 | FATTR4_WORD1_TIME_MODIFY, 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 192 FATTR4_WORD2_SECURITY_LABEL 193 #endif 194 }; 195 196 static const u32 nfs4_pnfs_open_bitmap[3] = { 197 FATTR4_WORD0_TYPE 198 | FATTR4_WORD0_CHANGE 199 | FATTR4_WORD0_SIZE 200 | FATTR4_WORD0_FSID 201 | FATTR4_WORD0_FILEID, 202 FATTR4_WORD1_MODE 203 | FATTR4_WORD1_NUMLINKS 204 | FATTR4_WORD1_OWNER 205 | FATTR4_WORD1_OWNER_GROUP 206 | FATTR4_WORD1_RAWDEV 207 | FATTR4_WORD1_SPACE_USED 208 | FATTR4_WORD1_TIME_ACCESS 209 | FATTR4_WORD1_TIME_METADATA 210 | FATTR4_WORD1_TIME_MODIFY, 211 FATTR4_WORD2_MDSTHRESHOLD 212 }; 213 214 static const u32 nfs4_open_noattr_bitmap[3] = { 215 FATTR4_WORD0_TYPE 216 | FATTR4_WORD0_CHANGE 217 | FATTR4_WORD0_FILEID, 218 }; 219 220 const u32 nfs4_statfs_bitmap[3] = { 221 FATTR4_WORD0_FILES_AVAIL 222 | FATTR4_WORD0_FILES_FREE 223 | FATTR4_WORD0_FILES_TOTAL, 224 FATTR4_WORD1_SPACE_AVAIL 225 | FATTR4_WORD1_SPACE_FREE 226 | FATTR4_WORD1_SPACE_TOTAL 227 }; 228 229 const u32 nfs4_pathconf_bitmap[3] = { 230 FATTR4_WORD0_MAXLINK 231 | FATTR4_WORD0_MAXNAME, 232 0 233 }; 234 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 236 | FATTR4_WORD0_MAXREAD 237 | FATTR4_WORD0_MAXWRITE 238 | FATTR4_WORD0_LEASE_TIME, 239 FATTR4_WORD1_TIME_DELTA 240 | FATTR4_WORD1_FS_LAYOUT_TYPES, 241 FATTR4_WORD2_LAYOUT_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(dentry->d_inode)); 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(dentry->d_parent->d_inode)); 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_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 348 { 349 struct nfs_client *clp = server->nfs_client; 350 struct nfs4_state *state = exception->state; 351 struct inode *inode = exception->inode; 352 int ret = errorcode; 353 354 exception->retry = 0; 355 switch(errorcode) { 356 case 0: 357 return 0; 358 case -NFS4ERR_OPENMODE: 359 if (inode && nfs4_have_delegation(inode, FMODE_READ)) { 360 nfs4_inode_return_delegation(inode); 361 exception->retry = 1; 362 return 0; 363 } 364 if (state == NULL) 365 break; 366 ret = nfs4_schedule_stateid_recovery(server, state); 367 if (ret < 0) 368 break; 369 goto wait_on_recovery; 370 case -NFS4ERR_DELEG_REVOKED: 371 case -NFS4ERR_ADMIN_REVOKED: 372 case -NFS4ERR_BAD_STATEID: 373 if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) { 374 nfs_remove_bad_delegation(inode); 375 exception->retry = 1; 376 break; 377 } 378 if (state == NULL) 379 break; 380 ret = nfs4_schedule_stateid_recovery(server, state); 381 if (ret < 0) 382 break; 383 goto wait_on_recovery; 384 case -NFS4ERR_EXPIRED: 385 if (state != NULL) { 386 ret = nfs4_schedule_stateid_recovery(server, state); 387 if (ret < 0) 388 break; 389 } 390 case -NFS4ERR_STALE_STATEID: 391 case -NFS4ERR_STALE_CLIENTID: 392 nfs4_schedule_lease_recovery(clp); 393 goto wait_on_recovery; 394 case -NFS4ERR_MOVED: 395 ret = nfs4_schedule_migration_recovery(server); 396 if (ret < 0) 397 break; 398 goto wait_on_recovery; 399 case -NFS4ERR_LEASE_MOVED: 400 nfs4_schedule_lease_moved_recovery(clp); 401 goto wait_on_recovery; 402 #if defined(CONFIG_NFS_V4_1) 403 case -NFS4ERR_BADSESSION: 404 case -NFS4ERR_BADSLOT: 405 case -NFS4ERR_BAD_HIGH_SLOT: 406 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 407 case -NFS4ERR_DEADSESSION: 408 case -NFS4ERR_SEQ_FALSE_RETRY: 409 case -NFS4ERR_SEQ_MISORDERED: 410 dprintk("%s ERROR: %d Reset session\n", __func__, 411 errorcode); 412 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 413 goto wait_on_recovery; 414 #endif /* defined(CONFIG_NFS_V4_1) */ 415 case -NFS4ERR_FILE_OPEN: 416 if (exception->timeout > HZ) { 417 /* We have retried a decent amount, time to 418 * fail 419 */ 420 ret = -EBUSY; 421 break; 422 } 423 case -NFS4ERR_GRACE: 424 case -NFS4ERR_DELAY: 425 ret = nfs4_delay(server->client, &exception->timeout); 426 if (ret != 0) 427 break; 428 case -NFS4ERR_RETRY_UNCACHED_REP: 429 case -NFS4ERR_OLD_STATEID: 430 exception->retry = 1; 431 break; 432 case -NFS4ERR_BADOWNER: 433 /* The following works around a Linux server bug! */ 434 case -NFS4ERR_BADNAME: 435 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 436 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 437 exception->retry = 1; 438 printk(KERN_WARNING "NFS: v4 server %s " 439 "does not accept raw " 440 "uid/gids. " 441 "Reenabling the idmapper.\n", 442 server->nfs_client->cl_hostname); 443 } 444 } 445 /* We failed to handle the error */ 446 return nfs4_map_errors(ret); 447 wait_on_recovery: 448 ret = nfs4_wait_clnt_recover(clp); 449 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 450 return -EIO; 451 if (ret == 0) 452 exception->retry = 1; 453 return ret; 454 } 455 456 /* 457 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 458 * or 'false' otherwise. 459 */ 460 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 461 { 462 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 463 464 if (flavor == RPC_AUTH_GSS_KRB5I || 465 flavor == RPC_AUTH_GSS_KRB5P) 466 return true; 467 468 return false; 469 } 470 471 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 472 { 473 spin_lock(&clp->cl_lock); 474 if (time_before(clp->cl_last_renewal,timestamp)) 475 clp->cl_last_renewal = timestamp; 476 spin_unlock(&clp->cl_lock); 477 } 478 479 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 480 { 481 do_renew_lease(server->nfs_client, timestamp); 482 } 483 484 struct nfs4_call_sync_data { 485 const struct nfs_server *seq_server; 486 struct nfs4_sequence_args *seq_args; 487 struct nfs4_sequence_res *seq_res; 488 }; 489 490 static void nfs4_init_sequence(struct nfs4_sequence_args *args, 491 struct nfs4_sequence_res *res, int cache_reply) 492 { 493 args->sa_slot = NULL; 494 args->sa_cache_this = cache_reply; 495 args->sa_privileged = 0; 496 497 res->sr_slot = NULL; 498 } 499 500 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 501 { 502 args->sa_privileged = 1; 503 } 504 505 static int nfs40_setup_sequence(const struct nfs_server *server, 506 struct nfs4_sequence_args *args, 507 struct nfs4_sequence_res *res, 508 struct rpc_task *task) 509 { 510 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl; 511 struct nfs4_slot *slot; 512 513 /* slot already allocated? */ 514 if (res->sr_slot != NULL) 515 goto out_start; 516 517 spin_lock(&tbl->slot_tbl_lock); 518 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 519 goto out_sleep; 520 521 slot = nfs4_alloc_slot(tbl); 522 if (IS_ERR(slot)) { 523 if (slot == ERR_PTR(-ENOMEM)) 524 task->tk_timeout = HZ >> 2; 525 goto out_sleep; 526 } 527 spin_unlock(&tbl->slot_tbl_lock); 528 529 args->sa_slot = slot; 530 res->sr_slot = slot; 531 532 out_start: 533 rpc_call_start(task); 534 return 0; 535 536 out_sleep: 537 if (args->sa_privileged) 538 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 539 NULL, RPC_PRIORITY_PRIVILEGED); 540 else 541 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 542 spin_unlock(&tbl->slot_tbl_lock); 543 return -EAGAIN; 544 } 545 546 static int nfs40_sequence_done(struct rpc_task *task, 547 struct nfs4_sequence_res *res) 548 { 549 struct nfs4_slot *slot = res->sr_slot; 550 struct nfs4_slot_table *tbl; 551 552 if (slot == NULL) 553 goto out; 554 555 tbl = slot->table; 556 spin_lock(&tbl->slot_tbl_lock); 557 if (!nfs41_wake_and_assign_slot(tbl, slot)) 558 nfs4_free_slot(tbl, slot); 559 spin_unlock(&tbl->slot_tbl_lock); 560 561 res->sr_slot = NULL; 562 out: 563 return 1; 564 } 565 566 #if defined(CONFIG_NFS_V4_1) 567 568 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 569 { 570 struct nfs4_session *session; 571 struct nfs4_slot_table *tbl; 572 struct nfs4_slot *slot = res->sr_slot; 573 bool send_new_highest_used_slotid = false; 574 575 tbl = slot->table; 576 session = tbl->session; 577 578 spin_lock(&tbl->slot_tbl_lock); 579 /* Be nice to the server: try to ensure that the last transmitted 580 * value for highest_user_slotid <= target_highest_slotid 581 */ 582 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 583 send_new_highest_used_slotid = true; 584 585 if (nfs41_wake_and_assign_slot(tbl, slot)) { 586 send_new_highest_used_slotid = false; 587 goto out_unlock; 588 } 589 nfs4_free_slot(tbl, slot); 590 591 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 592 send_new_highest_used_slotid = false; 593 out_unlock: 594 spin_unlock(&tbl->slot_tbl_lock); 595 res->sr_slot = NULL; 596 if (send_new_highest_used_slotid) 597 nfs41_server_notify_highest_slotid_update(session->clp); 598 } 599 600 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 601 { 602 struct nfs4_session *session; 603 struct nfs4_slot *slot = res->sr_slot; 604 struct nfs_client *clp; 605 bool interrupted = false; 606 int ret = 1; 607 608 if (slot == NULL) 609 goto out_noaction; 610 /* don't increment the sequence number if the task wasn't sent */ 611 if (!RPC_WAS_SENT(task)) 612 goto out; 613 614 session = slot->table->session; 615 616 if (slot->interrupted) { 617 slot->interrupted = 0; 618 interrupted = true; 619 } 620 621 trace_nfs4_sequence_done(session, res); 622 /* Check the SEQUENCE operation status */ 623 switch (res->sr_status) { 624 case 0: 625 /* Update the slot's sequence and clientid lease timer */ 626 ++slot->seq_nr; 627 clp = session->clp; 628 do_renew_lease(clp, res->sr_timestamp); 629 /* Check sequence flags */ 630 if (res->sr_status_flags != 0) 631 nfs4_schedule_lease_recovery(clp); 632 nfs41_update_target_slotid(slot->table, slot, res); 633 break; 634 case 1: 635 /* 636 * sr_status remains 1 if an RPC level error occurred. 637 * The server may or may not have processed the sequence 638 * operation.. 639 * Mark the slot as having hosted an interrupted RPC call. 640 */ 641 slot->interrupted = 1; 642 goto out; 643 case -NFS4ERR_DELAY: 644 /* The server detected a resend of the RPC call and 645 * returned NFS4ERR_DELAY as per Section 2.10.6.2 646 * of RFC5661. 647 */ 648 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 649 __func__, 650 slot->slot_nr, 651 slot->seq_nr); 652 goto out_retry; 653 case -NFS4ERR_BADSLOT: 654 /* 655 * The slot id we used was probably retired. Try again 656 * using a different slot id. 657 */ 658 goto retry_nowait; 659 case -NFS4ERR_SEQ_MISORDERED: 660 /* 661 * Was the last operation on this sequence interrupted? 662 * If so, retry after bumping the sequence number. 663 */ 664 if (interrupted) { 665 ++slot->seq_nr; 666 goto retry_nowait; 667 } 668 /* 669 * Could this slot have been previously retired? 670 * If so, then the server may be expecting seq_nr = 1! 671 */ 672 if (slot->seq_nr != 1) { 673 slot->seq_nr = 1; 674 goto retry_nowait; 675 } 676 break; 677 case -NFS4ERR_SEQ_FALSE_RETRY: 678 ++slot->seq_nr; 679 goto retry_nowait; 680 default: 681 /* Just update the slot sequence no. */ 682 ++slot->seq_nr; 683 } 684 out: 685 /* The session may be reset by one of the error handlers. */ 686 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 687 nfs41_sequence_free_slot(res); 688 out_noaction: 689 return ret; 690 retry_nowait: 691 if (rpc_restart_call_prepare(task)) { 692 task->tk_status = 0; 693 ret = 0; 694 } 695 goto out; 696 out_retry: 697 if (!rpc_restart_call(task)) 698 goto out; 699 rpc_delay(task, NFS4_POLL_RETRY_MAX); 700 return 0; 701 } 702 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 703 704 static int nfs4_sequence_done(struct rpc_task *task, 705 struct nfs4_sequence_res *res) 706 { 707 if (res->sr_slot == NULL) 708 return 1; 709 if (!res->sr_slot->table->session) 710 return nfs40_sequence_done(task, res); 711 return nfs41_sequence_done(task, res); 712 } 713 714 int nfs41_setup_sequence(struct nfs4_session *session, 715 struct nfs4_sequence_args *args, 716 struct nfs4_sequence_res *res, 717 struct rpc_task *task) 718 { 719 struct nfs4_slot *slot; 720 struct nfs4_slot_table *tbl; 721 722 dprintk("--> %s\n", __func__); 723 /* slot already allocated? */ 724 if (res->sr_slot != NULL) 725 goto out_success; 726 727 tbl = &session->fc_slot_table; 728 729 task->tk_timeout = 0; 730 731 spin_lock(&tbl->slot_tbl_lock); 732 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) && 733 !args->sa_privileged) { 734 /* The state manager will wait until the slot table is empty */ 735 dprintk("%s session is draining\n", __func__); 736 goto out_sleep; 737 } 738 739 slot = nfs4_alloc_slot(tbl); 740 if (IS_ERR(slot)) { 741 /* If out of memory, try again in 1/4 second */ 742 if (slot == ERR_PTR(-ENOMEM)) 743 task->tk_timeout = HZ >> 2; 744 dprintk("<-- %s: no free slots\n", __func__); 745 goto out_sleep; 746 } 747 spin_unlock(&tbl->slot_tbl_lock); 748 749 args->sa_slot = slot; 750 751 dprintk("<-- %s slotid=%u seqid=%u\n", __func__, 752 slot->slot_nr, slot->seq_nr); 753 754 res->sr_slot = slot; 755 res->sr_timestamp = jiffies; 756 res->sr_status_flags = 0; 757 /* 758 * sr_status is only set in decode_sequence, and so will remain 759 * set to 1 if an rpc level failure occurs. 760 */ 761 res->sr_status = 1; 762 trace_nfs4_setup_sequence(session, args); 763 out_success: 764 rpc_call_start(task); 765 return 0; 766 out_sleep: 767 /* Privileged tasks are queued with top priority */ 768 if (args->sa_privileged) 769 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 770 NULL, RPC_PRIORITY_PRIVILEGED); 771 else 772 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 773 spin_unlock(&tbl->slot_tbl_lock); 774 return -EAGAIN; 775 } 776 EXPORT_SYMBOL_GPL(nfs41_setup_sequence); 777 778 static int nfs4_setup_sequence(const struct nfs_server *server, 779 struct nfs4_sequence_args *args, 780 struct nfs4_sequence_res *res, 781 struct rpc_task *task) 782 { 783 struct nfs4_session *session = nfs4_get_session(server); 784 int ret = 0; 785 786 if (!session) 787 return nfs40_setup_sequence(server, args, res, task); 788 789 dprintk("--> %s clp %p session %p sr_slot %u\n", 790 __func__, session->clp, session, res->sr_slot ? 791 res->sr_slot->slot_nr : NFS4_NO_SLOT); 792 793 ret = nfs41_setup_sequence(session, args, res, task); 794 795 dprintk("<-- %s status=%d\n", __func__, ret); 796 return ret; 797 } 798 799 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 800 { 801 struct nfs4_call_sync_data *data = calldata; 802 struct nfs4_session *session = nfs4_get_session(data->seq_server); 803 804 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 805 806 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task); 807 } 808 809 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 810 { 811 struct nfs4_call_sync_data *data = calldata; 812 813 nfs41_sequence_done(task, data->seq_res); 814 } 815 816 static const struct rpc_call_ops nfs41_call_sync_ops = { 817 .rpc_call_prepare = nfs41_call_sync_prepare, 818 .rpc_call_done = nfs41_call_sync_done, 819 }; 820 821 #else /* !CONFIG_NFS_V4_1 */ 822 823 static int nfs4_setup_sequence(const struct nfs_server *server, 824 struct nfs4_sequence_args *args, 825 struct nfs4_sequence_res *res, 826 struct rpc_task *task) 827 { 828 return nfs40_setup_sequence(server, args, res, task); 829 } 830 831 static int nfs4_sequence_done(struct rpc_task *task, 832 struct nfs4_sequence_res *res) 833 { 834 return nfs40_sequence_done(task, res); 835 } 836 837 #endif /* !CONFIG_NFS_V4_1 */ 838 839 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 840 { 841 struct nfs4_call_sync_data *data = calldata; 842 nfs4_setup_sequence(data->seq_server, 843 data->seq_args, data->seq_res, task); 844 } 845 846 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 847 { 848 struct nfs4_call_sync_data *data = calldata; 849 nfs4_sequence_done(task, data->seq_res); 850 } 851 852 static const struct rpc_call_ops nfs40_call_sync_ops = { 853 .rpc_call_prepare = nfs40_call_sync_prepare, 854 .rpc_call_done = nfs40_call_sync_done, 855 }; 856 857 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 858 struct nfs_server *server, 859 struct rpc_message *msg, 860 struct nfs4_sequence_args *args, 861 struct nfs4_sequence_res *res) 862 { 863 int ret; 864 struct rpc_task *task; 865 struct nfs_client *clp = server->nfs_client; 866 struct nfs4_call_sync_data data = { 867 .seq_server = server, 868 .seq_args = args, 869 .seq_res = res, 870 }; 871 struct rpc_task_setup task_setup = { 872 .rpc_client = clnt, 873 .rpc_message = msg, 874 .callback_ops = clp->cl_mvops->call_sync_ops, 875 .callback_data = &data 876 }; 877 878 task = rpc_run_task(&task_setup); 879 if (IS_ERR(task)) 880 ret = PTR_ERR(task); 881 else { 882 ret = task->tk_status; 883 rpc_put_task(task); 884 } 885 return ret; 886 } 887 888 int nfs4_call_sync(struct rpc_clnt *clnt, 889 struct nfs_server *server, 890 struct rpc_message *msg, 891 struct nfs4_sequence_args *args, 892 struct nfs4_sequence_res *res, 893 int cache_reply) 894 { 895 nfs4_init_sequence(args, res, cache_reply); 896 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 897 } 898 899 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 900 { 901 struct nfs_inode *nfsi = NFS_I(dir); 902 903 spin_lock(&dir->i_lock); 904 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 905 if (!cinfo->atomic || cinfo->before != dir->i_version) 906 nfs_force_lookup_revalidate(dir); 907 dir->i_version = cinfo->after; 908 nfs_fscache_invalidate(dir); 909 spin_unlock(&dir->i_lock); 910 } 911 912 struct nfs4_opendata { 913 struct kref kref; 914 struct nfs_openargs o_arg; 915 struct nfs_openres o_res; 916 struct nfs_open_confirmargs c_arg; 917 struct nfs_open_confirmres c_res; 918 struct nfs4_string owner_name; 919 struct nfs4_string group_name; 920 struct nfs_fattr f_attr; 921 struct nfs4_label *f_label; 922 struct dentry *dir; 923 struct dentry *dentry; 924 struct nfs4_state_owner *owner; 925 struct nfs4_state *state; 926 struct iattr attrs; 927 unsigned long timestamp; 928 unsigned int rpc_done : 1; 929 unsigned int file_created : 1; 930 unsigned int is_recover : 1; 931 int rpc_status; 932 int cancelled; 933 }; 934 935 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 936 int err, struct nfs4_exception *exception) 937 { 938 if (err != -EINVAL) 939 return false; 940 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 941 return false; 942 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 943 exception->retry = 1; 944 return true; 945 } 946 947 static enum open_claim_type4 948 nfs4_map_atomic_open_claim(struct nfs_server *server, 949 enum open_claim_type4 claim) 950 { 951 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 952 return claim; 953 switch (claim) { 954 default: 955 return claim; 956 case NFS4_OPEN_CLAIM_FH: 957 return NFS4_OPEN_CLAIM_NULL; 958 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 959 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 960 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 961 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 962 } 963 } 964 965 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 966 { 967 p->o_res.f_attr = &p->f_attr; 968 p->o_res.f_label = p->f_label; 969 p->o_res.seqid = p->o_arg.seqid; 970 p->c_res.seqid = p->c_arg.seqid; 971 p->o_res.server = p->o_arg.server; 972 p->o_res.access_request = p->o_arg.access; 973 nfs_fattr_init(&p->f_attr); 974 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 975 } 976 977 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 978 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 979 const struct iattr *attrs, 980 struct nfs4_label *label, 981 enum open_claim_type4 claim, 982 gfp_t gfp_mask) 983 { 984 struct dentry *parent = dget_parent(dentry); 985 struct inode *dir = parent->d_inode; 986 struct nfs_server *server = NFS_SERVER(dir); 987 struct nfs4_opendata *p; 988 989 p = kzalloc(sizeof(*p), gfp_mask); 990 if (p == NULL) 991 goto err; 992 993 p->f_label = nfs4_label_alloc(server, gfp_mask); 994 if (IS_ERR(p->f_label)) 995 goto err_free_p; 996 997 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask); 998 if (p->o_arg.seqid == NULL) 999 goto err_free_label; 1000 nfs_sb_active(dentry->d_sb); 1001 p->dentry = dget(dentry); 1002 p->dir = parent; 1003 p->owner = sp; 1004 atomic_inc(&sp->so_count); 1005 p->o_arg.open_flags = flags; 1006 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1007 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 1008 * will return permission denied for all bits until close */ 1009 if (!(flags & O_EXCL)) { 1010 /* ask server to check for all possible rights as results 1011 * are cached */ 1012 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1013 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE; 1014 } 1015 p->o_arg.clientid = server->nfs_client->cl_clientid; 1016 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1017 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1018 p->o_arg.name = &dentry->d_name; 1019 p->o_arg.server = server; 1020 p->o_arg.bitmask = nfs4_bitmask(server, label); 1021 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1022 p->o_arg.label = label; 1023 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1024 switch (p->o_arg.claim) { 1025 case NFS4_OPEN_CLAIM_NULL: 1026 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1027 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1028 p->o_arg.fh = NFS_FH(dir); 1029 break; 1030 case NFS4_OPEN_CLAIM_PREVIOUS: 1031 case NFS4_OPEN_CLAIM_FH: 1032 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1033 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1034 p->o_arg.fh = NFS_FH(dentry->d_inode); 1035 } 1036 if (attrs != NULL && attrs->ia_valid != 0) { 1037 __u32 verf[2]; 1038 1039 p->o_arg.u.attrs = &p->attrs; 1040 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 1041 1042 verf[0] = jiffies; 1043 verf[1] = current->pid; 1044 memcpy(p->o_arg.u.verifier.data, verf, 1045 sizeof(p->o_arg.u.verifier.data)); 1046 } 1047 p->c_arg.fh = &p->o_res.fh; 1048 p->c_arg.stateid = &p->o_res.stateid; 1049 p->c_arg.seqid = p->o_arg.seqid; 1050 nfs4_init_opendata_res(p); 1051 kref_init(&p->kref); 1052 return p; 1053 1054 err_free_label: 1055 nfs4_label_free(p->f_label); 1056 err_free_p: 1057 kfree(p); 1058 err: 1059 dput(parent); 1060 return NULL; 1061 } 1062 1063 static void nfs4_opendata_free(struct kref *kref) 1064 { 1065 struct nfs4_opendata *p = container_of(kref, 1066 struct nfs4_opendata, kref); 1067 struct super_block *sb = p->dentry->d_sb; 1068 1069 nfs_free_seqid(p->o_arg.seqid); 1070 if (p->state != NULL) 1071 nfs4_put_open_state(p->state); 1072 nfs4_put_state_owner(p->owner); 1073 1074 nfs4_label_free(p->f_label); 1075 1076 dput(p->dir); 1077 dput(p->dentry); 1078 nfs_sb_deactive(sb); 1079 nfs_fattr_free_names(&p->f_attr); 1080 kfree(p->f_attr.mdsthreshold); 1081 kfree(p); 1082 } 1083 1084 static void nfs4_opendata_put(struct nfs4_opendata *p) 1085 { 1086 if (p != NULL) 1087 kref_put(&p->kref, nfs4_opendata_free); 1088 } 1089 1090 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 1091 { 1092 int ret; 1093 1094 ret = rpc_wait_for_completion_task(task); 1095 return ret; 1096 } 1097 1098 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1099 { 1100 int ret = 0; 1101 1102 if (open_mode & (O_EXCL|O_TRUNC)) 1103 goto out; 1104 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1105 case FMODE_READ: 1106 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1107 && state->n_rdonly != 0; 1108 break; 1109 case FMODE_WRITE: 1110 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1111 && state->n_wronly != 0; 1112 break; 1113 case FMODE_READ|FMODE_WRITE: 1114 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1115 && state->n_rdwr != 0; 1116 } 1117 out: 1118 return ret; 1119 } 1120 1121 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode) 1122 { 1123 if (delegation == NULL) 1124 return 0; 1125 if ((delegation->type & fmode) != fmode) 1126 return 0; 1127 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1128 return 0; 1129 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1130 return 0; 1131 nfs_mark_delegation_referenced(delegation); 1132 return 1; 1133 } 1134 1135 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1136 { 1137 switch (fmode) { 1138 case FMODE_WRITE: 1139 state->n_wronly++; 1140 break; 1141 case FMODE_READ: 1142 state->n_rdonly++; 1143 break; 1144 case FMODE_READ|FMODE_WRITE: 1145 state->n_rdwr++; 1146 } 1147 nfs4_state_set_mode_locked(state, state->state | fmode); 1148 } 1149 1150 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1151 { 1152 struct nfs_client *clp = state->owner->so_server->nfs_client; 1153 bool need_recover = false; 1154 1155 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1156 need_recover = true; 1157 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1158 need_recover = true; 1159 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1160 need_recover = true; 1161 if (need_recover) 1162 nfs4_state_mark_reclaim_nograce(clp, state); 1163 } 1164 1165 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1166 nfs4_stateid *stateid) 1167 { 1168 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0) 1169 return true; 1170 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1171 nfs_test_and_clear_all_open_stateid(state); 1172 return true; 1173 } 1174 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) 1175 return true; 1176 return false; 1177 } 1178 1179 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1180 nfs4_stateid *stateid, fmode_t fmode) 1181 { 1182 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1183 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1184 case FMODE_WRITE: 1185 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1186 break; 1187 case FMODE_READ: 1188 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1189 break; 1190 case 0: 1191 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1192 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1193 clear_bit(NFS_OPEN_STATE, &state->flags); 1194 } 1195 if (stateid == NULL) 1196 return; 1197 if (!nfs_need_update_open_stateid(state, stateid)) 1198 return; 1199 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1200 nfs4_stateid_copy(&state->stateid, stateid); 1201 nfs4_stateid_copy(&state->open_stateid, stateid); 1202 } 1203 1204 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 1205 { 1206 write_seqlock(&state->seqlock); 1207 nfs_clear_open_stateid_locked(state, stateid, fmode); 1208 write_sequnlock(&state->seqlock); 1209 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1210 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1211 } 1212 1213 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 1214 { 1215 switch (fmode) { 1216 case FMODE_READ: 1217 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1218 break; 1219 case FMODE_WRITE: 1220 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1221 break; 1222 case FMODE_READ|FMODE_WRITE: 1223 set_bit(NFS_O_RDWR_STATE, &state->flags); 1224 } 1225 if (!nfs_need_update_open_stateid(state, stateid)) 1226 return; 1227 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1228 nfs4_stateid_copy(&state->stateid, stateid); 1229 nfs4_stateid_copy(&state->open_stateid, stateid); 1230 } 1231 1232 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode) 1233 { 1234 /* 1235 * Protect the call to nfs4_state_set_mode_locked and 1236 * serialise the stateid update 1237 */ 1238 write_seqlock(&state->seqlock); 1239 if (deleg_stateid != NULL) { 1240 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1241 set_bit(NFS_DELEGATED_STATE, &state->flags); 1242 } 1243 if (open_stateid != NULL) 1244 nfs_set_open_stateid_locked(state, open_stateid, fmode); 1245 write_sequnlock(&state->seqlock); 1246 spin_lock(&state->owner->so_lock); 1247 update_open_stateflags(state, fmode); 1248 spin_unlock(&state->owner->so_lock); 1249 } 1250 1251 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode) 1252 { 1253 struct nfs_inode *nfsi = NFS_I(state->inode); 1254 struct nfs_delegation *deleg_cur; 1255 int ret = 0; 1256 1257 fmode &= (FMODE_READ|FMODE_WRITE); 1258 1259 rcu_read_lock(); 1260 deleg_cur = rcu_dereference(nfsi->delegation); 1261 if (deleg_cur == NULL) 1262 goto no_delegation; 1263 1264 spin_lock(&deleg_cur->lock); 1265 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1266 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1267 (deleg_cur->type & fmode) != fmode) 1268 goto no_delegation_unlock; 1269 1270 if (delegation == NULL) 1271 delegation = &deleg_cur->stateid; 1272 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1273 goto no_delegation_unlock; 1274 1275 nfs_mark_delegation_referenced(deleg_cur); 1276 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode); 1277 ret = 1; 1278 no_delegation_unlock: 1279 spin_unlock(&deleg_cur->lock); 1280 no_delegation: 1281 rcu_read_unlock(); 1282 1283 if (!ret && open_stateid != NULL) { 1284 __update_open_stateid(state, open_stateid, NULL, fmode); 1285 ret = 1; 1286 } 1287 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1288 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1289 1290 return ret; 1291 } 1292 1293 1294 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1295 { 1296 struct nfs_delegation *delegation; 1297 1298 rcu_read_lock(); 1299 delegation = rcu_dereference(NFS_I(inode)->delegation); 1300 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1301 rcu_read_unlock(); 1302 return; 1303 } 1304 rcu_read_unlock(); 1305 nfs4_inode_return_delegation(inode); 1306 } 1307 1308 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1309 { 1310 struct nfs4_state *state = opendata->state; 1311 struct nfs_inode *nfsi = NFS_I(state->inode); 1312 struct nfs_delegation *delegation; 1313 int open_mode = opendata->o_arg.open_flags; 1314 fmode_t fmode = opendata->o_arg.fmode; 1315 nfs4_stateid stateid; 1316 int ret = -EAGAIN; 1317 1318 for (;;) { 1319 spin_lock(&state->owner->so_lock); 1320 if (can_open_cached(state, fmode, open_mode)) { 1321 update_open_stateflags(state, fmode); 1322 spin_unlock(&state->owner->so_lock); 1323 goto out_return_state; 1324 } 1325 spin_unlock(&state->owner->so_lock); 1326 rcu_read_lock(); 1327 delegation = rcu_dereference(nfsi->delegation); 1328 if (!can_open_delegated(delegation, fmode)) { 1329 rcu_read_unlock(); 1330 break; 1331 } 1332 /* Save the delegation */ 1333 nfs4_stateid_copy(&stateid, &delegation->stateid); 1334 rcu_read_unlock(); 1335 nfs_release_seqid(opendata->o_arg.seqid); 1336 if (!opendata->is_recover) { 1337 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1338 if (ret != 0) 1339 goto out; 1340 } 1341 ret = -EAGAIN; 1342 1343 /* Try to update the stateid using the delegation */ 1344 if (update_open_stateid(state, NULL, &stateid, fmode)) 1345 goto out_return_state; 1346 } 1347 out: 1348 return ERR_PTR(ret); 1349 out_return_state: 1350 atomic_inc(&state->count); 1351 return state; 1352 } 1353 1354 static void 1355 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1356 { 1357 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1358 struct nfs_delegation *delegation; 1359 int delegation_flags = 0; 1360 1361 rcu_read_lock(); 1362 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1363 if (delegation) 1364 delegation_flags = delegation->flags; 1365 rcu_read_unlock(); 1366 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) { 1367 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1368 "returning a delegation for " 1369 "OPEN(CLAIM_DELEGATE_CUR)\n", 1370 clp->cl_hostname); 1371 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1372 nfs_inode_set_delegation(state->inode, 1373 data->owner->so_cred, 1374 &data->o_res); 1375 else 1376 nfs_inode_reclaim_delegation(state->inode, 1377 data->owner->so_cred, 1378 &data->o_res); 1379 } 1380 1381 /* 1382 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1383 * and update the nfs4_state. 1384 */ 1385 static struct nfs4_state * 1386 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1387 { 1388 struct inode *inode = data->state->inode; 1389 struct nfs4_state *state = data->state; 1390 int ret; 1391 1392 if (!data->rpc_done) { 1393 if (data->rpc_status) { 1394 ret = data->rpc_status; 1395 goto err; 1396 } 1397 /* cached opens have already been processed */ 1398 goto update; 1399 } 1400 1401 ret = nfs_refresh_inode(inode, &data->f_attr); 1402 if (ret) 1403 goto err; 1404 1405 if (data->o_res.delegation_type != 0) 1406 nfs4_opendata_check_deleg(data, state); 1407 update: 1408 update_open_stateid(state, &data->o_res.stateid, NULL, 1409 data->o_arg.fmode); 1410 atomic_inc(&state->count); 1411 1412 return state; 1413 err: 1414 return ERR_PTR(ret); 1415 1416 } 1417 1418 static struct nfs4_state * 1419 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1420 { 1421 struct inode *inode; 1422 struct nfs4_state *state = NULL; 1423 int ret; 1424 1425 if (!data->rpc_done) { 1426 state = nfs4_try_open_cached(data); 1427 goto out; 1428 } 1429 1430 ret = -EAGAIN; 1431 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1432 goto err; 1433 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label); 1434 ret = PTR_ERR(inode); 1435 if (IS_ERR(inode)) 1436 goto err; 1437 ret = -ENOMEM; 1438 state = nfs4_get_open_state(inode, data->owner); 1439 if (state == NULL) 1440 goto err_put_inode; 1441 if (data->o_res.delegation_type != 0) 1442 nfs4_opendata_check_deleg(data, state); 1443 update_open_stateid(state, &data->o_res.stateid, NULL, 1444 data->o_arg.fmode); 1445 iput(inode); 1446 out: 1447 nfs_release_seqid(data->o_arg.seqid); 1448 return state; 1449 err_put_inode: 1450 iput(inode); 1451 err: 1452 return ERR_PTR(ret); 1453 } 1454 1455 static struct nfs4_state * 1456 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1457 { 1458 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1459 return _nfs4_opendata_reclaim_to_nfs4_state(data); 1460 return _nfs4_opendata_to_nfs4_state(data); 1461 } 1462 1463 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1464 { 1465 struct nfs_inode *nfsi = NFS_I(state->inode); 1466 struct nfs_open_context *ctx; 1467 1468 spin_lock(&state->inode->i_lock); 1469 list_for_each_entry(ctx, &nfsi->open_files, list) { 1470 if (ctx->state != state) 1471 continue; 1472 get_nfs_open_context(ctx); 1473 spin_unlock(&state->inode->i_lock); 1474 return ctx; 1475 } 1476 spin_unlock(&state->inode->i_lock); 1477 return ERR_PTR(-ENOENT); 1478 } 1479 1480 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1481 struct nfs4_state *state, enum open_claim_type4 claim) 1482 { 1483 struct nfs4_opendata *opendata; 1484 1485 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1486 NULL, NULL, claim, GFP_NOFS); 1487 if (opendata == NULL) 1488 return ERR_PTR(-ENOMEM); 1489 opendata->state = state; 1490 atomic_inc(&state->count); 1491 return opendata; 1492 } 1493 1494 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res) 1495 { 1496 struct nfs4_state *newstate; 1497 int ret; 1498 1499 opendata->o_arg.open_flags = 0; 1500 opendata->o_arg.fmode = fmode; 1501 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1502 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1503 nfs4_init_opendata_res(opendata); 1504 ret = _nfs4_recover_proc_open(opendata); 1505 if (ret != 0) 1506 return ret; 1507 newstate = nfs4_opendata_to_nfs4_state(opendata); 1508 if (IS_ERR(newstate)) 1509 return PTR_ERR(newstate); 1510 nfs4_close_state(newstate, fmode); 1511 *res = newstate; 1512 return 0; 1513 } 1514 1515 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1516 { 1517 struct nfs4_state *newstate; 1518 int ret; 1519 1520 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1521 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1522 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1523 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1524 /* memory barrier prior to reading state->n_* */ 1525 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1526 clear_bit(NFS_OPEN_STATE, &state->flags); 1527 smp_rmb(); 1528 if (state->n_rdwr != 0) { 1529 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate); 1530 if (ret != 0) 1531 return ret; 1532 if (newstate != state) 1533 return -ESTALE; 1534 } 1535 if (state->n_wronly != 0) { 1536 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate); 1537 if (ret != 0) 1538 return ret; 1539 if (newstate != state) 1540 return -ESTALE; 1541 } 1542 if (state->n_rdonly != 0) { 1543 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate); 1544 if (ret != 0) 1545 return ret; 1546 if (newstate != state) 1547 return -ESTALE; 1548 } 1549 /* 1550 * We may have performed cached opens for all three recoveries. 1551 * Check if we need to update the current stateid. 1552 */ 1553 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1554 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1555 write_seqlock(&state->seqlock); 1556 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1557 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1558 write_sequnlock(&state->seqlock); 1559 } 1560 return 0; 1561 } 1562 1563 /* 1564 * OPEN_RECLAIM: 1565 * reclaim state on the server after a reboot. 1566 */ 1567 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1568 { 1569 struct nfs_delegation *delegation; 1570 struct nfs4_opendata *opendata; 1571 fmode_t delegation_type = 0; 1572 int status; 1573 1574 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1575 NFS4_OPEN_CLAIM_PREVIOUS); 1576 if (IS_ERR(opendata)) 1577 return PTR_ERR(opendata); 1578 rcu_read_lock(); 1579 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1580 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1581 delegation_type = delegation->type; 1582 rcu_read_unlock(); 1583 opendata->o_arg.u.delegation_type = delegation_type; 1584 status = nfs4_open_recover(opendata, state); 1585 nfs4_opendata_put(opendata); 1586 return status; 1587 } 1588 1589 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1590 { 1591 struct nfs_server *server = NFS_SERVER(state->inode); 1592 struct nfs4_exception exception = { }; 1593 int err; 1594 do { 1595 err = _nfs4_do_open_reclaim(ctx, state); 1596 trace_nfs4_open_reclaim(ctx, 0, err); 1597 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 1598 continue; 1599 if (err != -NFS4ERR_DELAY) 1600 break; 1601 nfs4_handle_exception(server, err, &exception); 1602 } while (exception.retry); 1603 return err; 1604 } 1605 1606 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 1607 { 1608 struct nfs_open_context *ctx; 1609 int ret; 1610 1611 ctx = nfs4_state_find_open_context(state); 1612 if (IS_ERR(ctx)) 1613 return -EAGAIN; 1614 ret = nfs4_do_open_reclaim(ctx, state); 1615 put_nfs_open_context(ctx); 1616 return ret; 1617 } 1618 1619 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err) 1620 { 1621 switch (err) { 1622 default: 1623 printk(KERN_ERR "NFS: %s: unhandled error " 1624 "%d.\n", __func__, err); 1625 case 0: 1626 case -ENOENT: 1627 case -ESTALE: 1628 break; 1629 case -NFS4ERR_BADSESSION: 1630 case -NFS4ERR_BADSLOT: 1631 case -NFS4ERR_BAD_HIGH_SLOT: 1632 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1633 case -NFS4ERR_DEADSESSION: 1634 set_bit(NFS_DELEGATED_STATE, &state->flags); 1635 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 1636 return -EAGAIN; 1637 case -NFS4ERR_STALE_CLIENTID: 1638 case -NFS4ERR_STALE_STATEID: 1639 set_bit(NFS_DELEGATED_STATE, &state->flags); 1640 case -NFS4ERR_EXPIRED: 1641 /* Don't recall a delegation if it was lost */ 1642 nfs4_schedule_lease_recovery(server->nfs_client); 1643 return -EAGAIN; 1644 case -NFS4ERR_MOVED: 1645 nfs4_schedule_migration_recovery(server); 1646 return -EAGAIN; 1647 case -NFS4ERR_LEASE_MOVED: 1648 nfs4_schedule_lease_moved_recovery(server->nfs_client); 1649 return -EAGAIN; 1650 case -NFS4ERR_DELEG_REVOKED: 1651 case -NFS4ERR_ADMIN_REVOKED: 1652 case -NFS4ERR_BAD_STATEID: 1653 case -NFS4ERR_OPENMODE: 1654 nfs_inode_find_state_and_recover(state->inode, 1655 stateid); 1656 nfs4_schedule_stateid_recovery(server, state); 1657 return 0; 1658 case -NFS4ERR_DELAY: 1659 case -NFS4ERR_GRACE: 1660 set_bit(NFS_DELEGATED_STATE, &state->flags); 1661 ssleep(1); 1662 return -EAGAIN; 1663 case -ENOMEM: 1664 case -NFS4ERR_DENIED: 1665 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 1666 return 0; 1667 } 1668 return err; 1669 } 1670 1671 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 1672 { 1673 struct nfs_server *server = NFS_SERVER(state->inode); 1674 struct nfs4_opendata *opendata; 1675 int err; 1676 1677 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1678 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 1679 if (IS_ERR(opendata)) 1680 return PTR_ERR(opendata); 1681 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 1682 err = nfs4_open_recover(opendata, state); 1683 nfs4_opendata_put(opendata); 1684 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 1685 } 1686 1687 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 1688 { 1689 struct nfs4_opendata *data = calldata; 1690 1691 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args, 1692 &data->c_res.seq_res, task); 1693 } 1694 1695 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 1696 { 1697 struct nfs4_opendata *data = calldata; 1698 1699 nfs40_sequence_done(task, &data->c_res.seq_res); 1700 1701 data->rpc_status = task->tk_status; 1702 if (data->rpc_status == 0) { 1703 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 1704 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1705 renew_lease(data->o_res.server, data->timestamp); 1706 data->rpc_done = 1; 1707 } 1708 } 1709 1710 static void nfs4_open_confirm_release(void *calldata) 1711 { 1712 struct nfs4_opendata *data = calldata; 1713 struct nfs4_state *state = NULL; 1714 1715 /* If this request hasn't been cancelled, do nothing */ 1716 if (data->cancelled == 0) 1717 goto out_free; 1718 /* In case of error, no cleanup! */ 1719 if (!data->rpc_done) 1720 goto out_free; 1721 state = nfs4_opendata_to_nfs4_state(data); 1722 if (!IS_ERR(state)) 1723 nfs4_close_state(state, data->o_arg.fmode); 1724 out_free: 1725 nfs4_opendata_put(data); 1726 } 1727 1728 static const struct rpc_call_ops nfs4_open_confirm_ops = { 1729 .rpc_call_prepare = nfs4_open_confirm_prepare, 1730 .rpc_call_done = nfs4_open_confirm_done, 1731 .rpc_release = nfs4_open_confirm_release, 1732 }; 1733 1734 /* 1735 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 1736 */ 1737 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 1738 { 1739 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 1740 struct rpc_task *task; 1741 struct rpc_message msg = { 1742 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 1743 .rpc_argp = &data->c_arg, 1744 .rpc_resp = &data->c_res, 1745 .rpc_cred = data->owner->so_cred, 1746 }; 1747 struct rpc_task_setup task_setup_data = { 1748 .rpc_client = server->client, 1749 .rpc_message = &msg, 1750 .callback_ops = &nfs4_open_confirm_ops, 1751 .callback_data = data, 1752 .workqueue = nfsiod_workqueue, 1753 .flags = RPC_TASK_ASYNC, 1754 }; 1755 int status; 1756 1757 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); 1758 kref_get(&data->kref); 1759 data->rpc_done = 0; 1760 data->rpc_status = 0; 1761 data->timestamp = jiffies; 1762 task = rpc_run_task(&task_setup_data); 1763 if (IS_ERR(task)) 1764 return PTR_ERR(task); 1765 status = nfs4_wait_for_completion_rpc_task(task); 1766 if (status != 0) { 1767 data->cancelled = 1; 1768 smp_wmb(); 1769 } else 1770 status = data->rpc_status; 1771 rpc_put_task(task); 1772 return status; 1773 } 1774 1775 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 1776 { 1777 struct nfs4_opendata *data = calldata; 1778 struct nfs4_state_owner *sp = data->owner; 1779 struct nfs_client *clp = sp->so_server->nfs_client; 1780 1781 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 1782 goto out_wait; 1783 /* 1784 * Check if we still need to send an OPEN call, or if we can use 1785 * a delegation instead. 1786 */ 1787 if (data->state != NULL) { 1788 struct nfs_delegation *delegation; 1789 1790 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 1791 goto out_no_action; 1792 rcu_read_lock(); 1793 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 1794 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR && 1795 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH && 1796 can_open_delegated(delegation, data->o_arg.fmode)) 1797 goto unlock_no_action; 1798 rcu_read_unlock(); 1799 } 1800 /* Update client id. */ 1801 data->o_arg.clientid = clp->cl_clientid; 1802 switch (data->o_arg.claim) { 1803 case NFS4_OPEN_CLAIM_PREVIOUS: 1804 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1805 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1806 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 1807 case NFS4_OPEN_CLAIM_FH: 1808 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 1809 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 1810 } 1811 data->timestamp = jiffies; 1812 if (nfs4_setup_sequence(data->o_arg.server, 1813 &data->o_arg.seq_args, 1814 &data->o_res.seq_res, 1815 task) != 0) 1816 nfs_release_seqid(data->o_arg.seqid); 1817 1818 /* Set the create mode (note dependency on the session type) */ 1819 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 1820 if (data->o_arg.open_flags & O_EXCL) { 1821 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 1822 if (nfs4_has_persistent_session(clp)) 1823 data->o_arg.createmode = NFS4_CREATE_GUARDED; 1824 else if (clp->cl_mvops->minor_version > 0) 1825 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 1826 } 1827 return; 1828 unlock_no_action: 1829 rcu_read_unlock(); 1830 out_no_action: 1831 task->tk_action = NULL; 1832 out_wait: 1833 nfs4_sequence_done(task, &data->o_res.seq_res); 1834 } 1835 1836 static void nfs4_open_done(struct rpc_task *task, void *calldata) 1837 { 1838 struct nfs4_opendata *data = calldata; 1839 1840 data->rpc_status = task->tk_status; 1841 1842 if (!nfs4_sequence_done(task, &data->o_res.seq_res)) 1843 return; 1844 1845 if (task->tk_status == 0) { 1846 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 1847 switch (data->o_res.f_attr->mode & S_IFMT) { 1848 case S_IFREG: 1849 break; 1850 case S_IFLNK: 1851 data->rpc_status = -ELOOP; 1852 break; 1853 case S_IFDIR: 1854 data->rpc_status = -EISDIR; 1855 break; 1856 default: 1857 data->rpc_status = -ENOTDIR; 1858 } 1859 } 1860 renew_lease(data->o_res.server, data->timestamp); 1861 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 1862 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1863 } 1864 data->rpc_done = 1; 1865 } 1866 1867 static void nfs4_open_release(void *calldata) 1868 { 1869 struct nfs4_opendata *data = calldata; 1870 struct nfs4_state *state = NULL; 1871 1872 /* If this request hasn't been cancelled, do nothing */ 1873 if (data->cancelled == 0) 1874 goto out_free; 1875 /* In case of error, no cleanup! */ 1876 if (data->rpc_status != 0 || !data->rpc_done) 1877 goto out_free; 1878 /* In case we need an open_confirm, no cleanup! */ 1879 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 1880 goto out_free; 1881 state = nfs4_opendata_to_nfs4_state(data); 1882 if (!IS_ERR(state)) 1883 nfs4_close_state(state, data->o_arg.fmode); 1884 out_free: 1885 nfs4_opendata_put(data); 1886 } 1887 1888 static const struct rpc_call_ops nfs4_open_ops = { 1889 .rpc_call_prepare = nfs4_open_prepare, 1890 .rpc_call_done = nfs4_open_done, 1891 .rpc_release = nfs4_open_release, 1892 }; 1893 1894 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 1895 { 1896 struct inode *dir = data->dir->d_inode; 1897 struct nfs_server *server = NFS_SERVER(dir); 1898 struct nfs_openargs *o_arg = &data->o_arg; 1899 struct nfs_openres *o_res = &data->o_res; 1900 struct rpc_task *task; 1901 struct rpc_message msg = { 1902 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 1903 .rpc_argp = o_arg, 1904 .rpc_resp = o_res, 1905 .rpc_cred = data->owner->so_cred, 1906 }; 1907 struct rpc_task_setup task_setup_data = { 1908 .rpc_client = server->client, 1909 .rpc_message = &msg, 1910 .callback_ops = &nfs4_open_ops, 1911 .callback_data = data, 1912 .workqueue = nfsiod_workqueue, 1913 .flags = RPC_TASK_ASYNC, 1914 }; 1915 int status; 1916 1917 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 1918 kref_get(&data->kref); 1919 data->rpc_done = 0; 1920 data->rpc_status = 0; 1921 data->cancelled = 0; 1922 data->is_recover = 0; 1923 if (isrecover) { 1924 nfs4_set_sequence_privileged(&o_arg->seq_args); 1925 data->is_recover = 1; 1926 } 1927 task = rpc_run_task(&task_setup_data); 1928 if (IS_ERR(task)) 1929 return PTR_ERR(task); 1930 status = nfs4_wait_for_completion_rpc_task(task); 1931 if (status != 0) { 1932 data->cancelled = 1; 1933 smp_wmb(); 1934 } else 1935 status = data->rpc_status; 1936 rpc_put_task(task); 1937 1938 return status; 1939 } 1940 1941 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 1942 { 1943 struct inode *dir = data->dir->d_inode; 1944 struct nfs_openres *o_res = &data->o_res; 1945 int status; 1946 1947 status = nfs4_run_open_task(data, 1); 1948 if (status != 0 || !data->rpc_done) 1949 return status; 1950 1951 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 1952 1953 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 1954 status = _nfs4_proc_open_confirm(data); 1955 if (status != 0) 1956 return status; 1957 } 1958 1959 return status; 1960 } 1961 1962 /* 1963 * Additional permission checks in order to distinguish between an 1964 * open for read, and an open for execute. This works around the 1965 * fact that NFSv4 OPEN treats read and execute permissions as being 1966 * the same. 1967 * Note that in the non-execute case, we want to turn off permission 1968 * checking if we just created a new file (POSIX open() semantics). 1969 */ 1970 static int nfs4_opendata_access(struct rpc_cred *cred, 1971 struct nfs4_opendata *opendata, 1972 struct nfs4_state *state, fmode_t fmode, 1973 int openflags) 1974 { 1975 struct nfs_access_entry cache; 1976 u32 mask; 1977 1978 /* access call failed or for some reason the server doesn't 1979 * support any access modes -- defer access call until later */ 1980 if (opendata->o_res.access_supported == 0) 1981 return 0; 1982 1983 mask = 0; 1984 /* 1985 * Use openflags to check for exec, because fmode won't 1986 * always have FMODE_EXEC set when file open for exec. 1987 */ 1988 if (openflags & __FMODE_EXEC) { 1989 /* ONLY check for exec rights */ 1990 mask = MAY_EXEC; 1991 } else if ((fmode & FMODE_READ) && !opendata->file_created) 1992 mask = MAY_READ; 1993 1994 cache.cred = cred; 1995 cache.jiffies = jiffies; 1996 nfs_access_set_mask(&cache, opendata->o_res.access_result); 1997 nfs_access_add_cache(state->inode, &cache); 1998 1999 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 2000 return 0; 2001 2002 /* even though OPEN succeeded, access is denied. Close the file */ 2003 nfs4_close_state(state, fmode); 2004 return -EACCES; 2005 } 2006 2007 /* 2008 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2009 */ 2010 static int _nfs4_proc_open(struct nfs4_opendata *data) 2011 { 2012 struct inode *dir = data->dir->d_inode; 2013 struct nfs_server *server = NFS_SERVER(dir); 2014 struct nfs_openargs *o_arg = &data->o_arg; 2015 struct nfs_openres *o_res = &data->o_res; 2016 int status; 2017 2018 status = nfs4_run_open_task(data, 0); 2019 if (!data->rpc_done) 2020 return status; 2021 if (status != 0) { 2022 if (status == -NFS4ERR_BADNAME && 2023 !(o_arg->open_flags & O_CREAT)) 2024 return -ENOENT; 2025 return status; 2026 } 2027 2028 nfs_fattr_map_and_free_names(server, &data->f_attr); 2029 2030 if (o_arg->open_flags & O_CREAT) { 2031 update_changeattr(dir, &o_res->cinfo); 2032 if (o_arg->open_flags & O_EXCL) 2033 data->file_created = 1; 2034 else if (o_res->cinfo.before != o_res->cinfo.after) 2035 data->file_created = 1; 2036 } 2037 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2038 server->caps &= ~NFS_CAP_POSIX_LOCK; 2039 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2040 status = _nfs4_proc_open_confirm(data); 2041 if (status != 0) 2042 return status; 2043 } 2044 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 2045 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2046 return 0; 2047 } 2048 2049 static int nfs4_recover_expired_lease(struct nfs_server *server) 2050 { 2051 return nfs4_client_recover_expired_lease(server->nfs_client); 2052 } 2053 2054 /* 2055 * OPEN_EXPIRED: 2056 * reclaim state on the server after a network partition. 2057 * Assumes caller holds the appropriate lock 2058 */ 2059 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2060 { 2061 struct nfs4_opendata *opendata; 2062 int ret; 2063 2064 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2065 NFS4_OPEN_CLAIM_FH); 2066 if (IS_ERR(opendata)) 2067 return PTR_ERR(opendata); 2068 ret = nfs4_open_recover(opendata, state); 2069 if (ret == -ESTALE) 2070 d_drop(ctx->dentry); 2071 nfs4_opendata_put(opendata); 2072 return ret; 2073 } 2074 2075 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2076 { 2077 struct nfs_server *server = NFS_SERVER(state->inode); 2078 struct nfs4_exception exception = { }; 2079 int err; 2080 2081 do { 2082 err = _nfs4_open_expired(ctx, state); 2083 trace_nfs4_open_expired(ctx, 0, err); 2084 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2085 continue; 2086 switch (err) { 2087 default: 2088 goto out; 2089 case -NFS4ERR_GRACE: 2090 case -NFS4ERR_DELAY: 2091 nfs4_handle_exception(server, err, &exception); 2092 err = 0; 2093 } 2094 } while (exception.retry); 2095 out: 2096 return err; 2097 } 2098 2099 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2100 { 2101 struct nfs_open_context *ctx; 2102 int ret; 2103 2104 ctx = nfs4_state_find_open_context(state); 2105 if (IS_ERR(ctx)) 2106 return -EAGAIN; 2107 ret = nfs4_do_open_expired(ctx, state); 2108 put_nfs_open_context(ctx); 2109 return ret; 2110 } 2111 2112 #if defined(CONFIG_NFS_V4_1) 2113 static void nfs41_clear_delegation_stateid(struct nfs4_state *state) 2114 { 2115 struct nfs_server *server = NFS_SERVER(state->inode); 2116 nfs4_stateid *stateid = &state->stateid; 2117 struct nfs_delegation *delegation; 2118 struct rpc_cred *cred = NULL; 2119 int status = -NFS4ERR_BAD_STATEID; 2120 2121 /* If a state reset has been done, test_stateid is unneeded */ 2122 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2123 return; 2124 2125 /* Get the delegation credential for use by test/free_stateid */ 2126 rcu_read_lock(); 2127 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2128 if (delegation != NULL && 2129 nfs4_stateid_match(&delegation->stateid, stateid)) { 2130 cred = get_rpccred(delegation->cred); 2131 rcu_read_unlock(); 2132 status = nfs41_test_stateid(server, stateid, cred); 2133 trace_nfs4_test_delegation_stateid(state, NULL, status); 2134 } else 2135 rcu_read_unlock(); 2136 2137 if (status != NFS_OK) { 2138 /* Free the stateid unless the server explicitly 2139 * informs us the stateid is unrecognized. */ 2140 if (status != -NFS4ERR_BAD_STATEID) 2141 nfs41_free_stateid(server, stateid, cred); 2142 nfs_remove_bad_delegation(state->inode); 2143 2144 write_seqlock(&state->seqlock); 2145 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2146 write_sequnlock(&state->seqlock); 2147 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2148 } 2149 2150 if (cred != NULL) 2151 put_rpccred(cred); 2152 } 2153 2154 /** 2155 * nfs41_check_open_stateid - possibly free an open stateid 2156 * 2157 * @state: NFSv4 state for an inode 2158 * 2159 * Returns NFS_OK if recovery for this stateid is now finished. 2160 * Otherwise a negative NFS4ERR value is returned. 2161 */ 2162 static int nfs41_check_open_stateid(struct nfs4_state *state) 2163 { 2164 struct nfs_server *server = NFS_SERVER(state->inode); 2165 nfs4_stateid *stateid = &state->open_stateid; 2166 struct rpc_cred *cred = state->owner->so_cred; 2167 int status; 2168 2169 /* If a state reset has been done, test_stateid is unneeded */ 2170 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 2171 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 2172 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 2173 return -NFS4ERR_BAD_STATEID; 2174 2175 status = nfs41_test_stateid(server, stateid, cred); 2176 trace_nfs4_test_open_stateid(state, NULL, status); 2177 if (status != NFS_OK) { 2178 /* Free the stateid unless the server explicitly 2179 * informs us the stateid is unrecognized. */ 2180 if (status != -NFS4ERR_BAD_STATEID) 2181 nfs41_free_stateid(server, stateid, cred); 2182 2183 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2184 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2185 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2186 clear_bit(NFS_OPEN_STATE, &state->flags); 2187 } 2188 return status; 2189 } 2190 2191 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2192 { 2193 int status; 2194 2195 nfs41_clear_delegation_stateid(state); 2196 status = nfs41_check_open_stateid(state); 2197 if (status != NFS_OK) 2198 status = nfs4_open_expired(sp, state); 2199 return status; 2200 } 2201 #endif 2202 2203 /* 2204 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2205 * fields corresponding to attributes that were used to store the verifier. 2206 * Make sure we clobber those fields in the later setattr call 2207 */ 2208 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 2209 { 2210 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2211 !(sattr->ia_valid & ATTR_ATIME_SET)) 2212 sattr->ia_valid |= ATTR_ATIME; 2213 2214 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2215 !(sattr->ia_valid & ATTR_MTIME_SET)) 2216 sattr->ia_valid |= ATTR_MTIME; 2217 } 2218 2219 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2220 fmode_t fmode, 2221 int flags, 2222 struct nfs_open_context *ctx) 2223 { 2224 struct nfs4_state_owner *sp = opendata->owner; 2225 struct nfs_server *server = sp->so_server; 2226 struct dentry *dentry; 2227 struct nfs4_state *state; 2228 unsigned int seq; 2229 int ret; 2230 2231 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2232 2233 ret = _nfs4_proc_open(opendata); 2234 if (ret != 0) { 2235 if (ret == -ENOENT) { 2236 dentry = opendata->dentry; 2237 if (dentry->d_inode) 2238 d_delete(dentry); 2239 else if (d_unhashed(dentry)) 2240 d_add(dentry, NULL); 2241 2242 nfs_set_verifier(dentry, 2243 nfs_save_change_attribute(opendata->dir->d_inode)); 2244 } 2245 goto out; 2246 } 2247 2248 state = nfs4_opendata_to_nfs4_state(opendata); 2249 ret = PTR_ERR(state); 2250 if (IS_ERR(state)) 2251 goto out; 2252 if (server->caps & NFS_CAP_POSIX_LOCK) 2253 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2254 2255 dentry = opendata->dentry; 2256 if (dentry->d_inode == NULL) { 2257 /* FIXME: Is this d_drop() ever needed? */ 2258 d_drop(dentry); 2259 dentry = d_add_unique(dentry, igrab(state->inode)); 2260 if (dentry == NULL) { 2261 dentry = opendata->dentry; 2262 } else if (dentry != ctx->dentry) { 2263 dput(ctx->dentry); 2264 ctx->dentry = dget(dentry); 2265 } 2266 nfs_set_verifier(dentry, 2267 nfs_save_change_attribute(opendata->dir->d_inode)); 2268 } 2269 2270 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2271 if (ret != 0) 2272 goto out; 2273 2274 ctx->state = state; 2275 if (dentry->d_inode == state->inode) { 2276 nfs_inode_attach_open_context(ctx); 2277 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2278 nfs4_schedule_stateid_recovery(server, state); 2279 } 2280 out: 2281 return ret; 2282 } 2283 2284 /* 2285 * Returns a referenced nfs4_state 2286 */ 2287 static int _nfs4_do_open(struct inode *dir, 2288 struct nfs_open_context *ctx, 2289 int flags, 2290 struct iattr *sattr, 2291 struct nfs4_label *label, 2292 int *opened) 2293 { 2294 struct nfs4_state_owner *sp; 2295 struct nfs4_state *state = NULL; 2296 struct nfs_server *server = NFS_SERVER(dir); 2297 struct nfs4_opendata *opendata; 2298 struct dentry *dentry = ctx->dentry; 2299 struct rpc_cred *cred = ctx->cred; 2300 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2301 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2302 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2303 struct nfs4_label *olabel = NULL; 2304 int status; 2305 2306 /* Protect against reboot recovery conflicts */ 2307 status = -ENOMEM; 2308 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2309 if (sp == NULL) { 2310 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2311 goto out_err; 2312 } 2313 status = nfs4_recover_expired_lease(server); 2314 if (status != 0) 2315 goto err_put_state_owner; 2316 if (dentry->d_inode != NULL) 2317 nfs4_return_incompatible_delegation(dentry->d_inode, fmode); 2318 status = -ENOMEM; 2319 if (dentry->d_inode) 2320 claim = NFS4_OPEN_CLAIM_FH; 2321 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, 2322 label, claim, GFP_KERNEL); 2323 if (opendata == NULL) 2324 goto err_put_state_owner; 2325 2326 if (label) { 2327 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2328 if (IS_ERR(olabel)) { 2329 status = PTR_ERR(olabel); 2330 goto err_opendata_put; 2331 } 2332 } 2333 2334 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2335 if (!opendata->f_attr.mdsthreshold) { 2336 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2337 if (!opendata->f_attr.mdsthreshold) 2338 goto err_free_label; 2339 } 2340 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2341 } 2342 if (dentry->d_inode != NULL) 2343 opendata->state = nfs4_get_open_state(dentry->d_inode, sp); 2344 2345 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2346 if (status != 0) 2347 goto err_free_label; 2348 state = ctx->state; 2349 2350 if ((opendata->o_arg.open_flags & O_EXCL) && 2351 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2352 nfs4_exclusive_attrset(opendata, sattr); 2353 2354 nfs_fattr_init(opendata->o_res.f_attr); 2355 status = nfs4_do_setattr(state->inode, cred, 2356 opendata->o_res.f_attr, sattr, 2357 state, label, olabel); 2358 if (status == 0) { 2359 nfs_setattr_update_inode(state->inode, sattr); 2360 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr); 2361 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2362 } 2363 } 2364 if (opendata->file_created) 2365 *opened |= FILE_CREATED; 2366 2367 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2368 *ctx_th = opendata->f_attr.mdsthreshold; 2369 opendata->f_attr.mdsthreshold = NULL; 2370 } 2371 2372 nfs4_label_free(olabel); 2373 2374 nfs4_opendata_put(opendata); 2375 nfs4_put_state_owner(sp); 2376 return 0; 2377 err_free_label: 2378 nfs4_label_free(olabel); 2379 err_opendata_put: 2380 nfs4_opendata_put(opendata); 2381 err_put_state_owner: 2382 nfs4_put_state_owner(sp); 2383 out_err: 2384 return status; 2385 } 2386 2387 2388 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2389 struct nfs_open_context *ctx, 2390 int flags, 2391 struct iattr *sattr, 2392 struct nfs4_label *label, 2393 int *opened) 2394 { 2395 struct nfs_server *server = NFS_SERVER(dir); 2396 struct nfs4_exception exception = { }; 2397 struct nfs4_state *res; 2398 int status; 2399 2400 do { 2401 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened); 2402 res = ctx->state; 2403 trace_nfs4_open_file(ctx, flags, status); 2404 if (status == 0) 2405 break; 2406 /* NOTE: BAD_SEQID means the server and client disagree about the 2407 * book-keeping w.r.t. state-changing operations 2408 * (OPEN/CLOSE/LOCK/LOCKU...) 2409 * It is actually a sign of a bug on the client or on the server. 2410 * 2411 * If we receive a BAD_SEQID error in the particular case of 2412 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2413 * have unhashed the old state_owner for us, and that we can 2414 * therefore safely retry using a new one. We should still warn 2415 * the user though... 2416 */ 2417 if (status == -NFS4ERR_BAD_SEQID) { 2418 pr_warn_ratelimited("NFS: v4 server %s " 2419 " returned a bad sequence-id error!\n", 2420 NFS_SERVER(dir)->nfs_client->cl_hostname); 2421 exception.retry = 1; 2422 continue; 2423 } 2424 /* 2425 * BAD_STATEID on OPEN means that the server cancelled our 2426 * state before it received the OPEN_CONFIRM. 2427 * Recover by retrying the request as per the discussion 2428 * on Page 181 of RFC3530. 2429 */ 2430 if (status == -NFS4ERR_BAD_STATEID) { 2431 exception.retry = 1; 2432 continue; 2433 } 2434 if (status == -EAGAIN) { 2435 /* We must have found a delegation */ 2436 exception.retry = 1; 2437 continue; 2438 } 2439 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2440 continue; 2441 res = ERR_PTR(nfs4_handle_exception(server, 2442 status, &exception)); 2443 } while (exception.retry); 2444 return res; 2445 } 2446 2447 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2448 struct nfs_fattr *fattr, struct iattr *sattr, 2449 struct nfs4_state *state, struct nfs4_label *ilabel, 2450 struct nfs4_label *olabel) 2451 { 2452 struct nfs_server *server = NFS_SERVER(inode); 2453 struct nfs_setattrargs arg = { 2454 .fh = NFS_FH(inode), 2455 .iap = sattr, 2456 .server = server, 2457 .bitmask = server->attr_bitmask, 2458 .label = ilabel, 2459 }; 2460 struct nfs_setattrres res = { 2461 .fattr = fattr, 2462 .label = olabel, 2463 .server = server, 2464 }; 2465 struct rpc_message msg = { 2466 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2467 .rpc_argp = &arg, 2468 .rpc_resp = &res, 2469 .rpc_cred = cred, 2470 }; 2471 unsigned long timestamp = jiffies; 2472 fmode_t fmode; 2473 bool truncate; 2474 int status; 2475 2476 arg.bitmask = nfs4_bitmask(server, ilabel); 2477 if (ilabel) 2478 arg.bitmask = nfs4_bitmask(server, olabel); 2479 2480 nfs_fattr_init(fattr); 2481 2482 /* Servers should only apply open mode checks for file size changes */ 2483 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false; 2484 fmode = truncate ? FMODE_WRITE : FMODE_READ; 2485 2486 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) { 2487 /* Use that stateid */ 2488 } else if (truncate && state != NULL) { 2489 struct nfs_lockowner lockowner = { 2490 .l_owner = current->files, 2491 .l_pid = current->tgid, 2492 }; 2493 if (!nfs4_valid_open_stateid(state)) 2494 return -EBADF; 2495 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE, 2496 &lockowner) == -EIO) 2497 return -EBADF; 2498 } else 2499 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 2500 2501 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 2502 if (status == 0 && state != NULL) 2503 renew_lease(server, timestamp); 2504 return status; 2505 } 2506 2507 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2508 struct nfs_fattr *fattr, struct iattr *sattr, 2509 struct nfs4_state *state, struct nfs4_label *ilabel, 2510 struct nfs4_label *olabel) 2511 { 2512 struct nfs_server *server = NFS_SERVER(inode); 2513 struct nfs4_exception exception = { 2514 .state = state, 2515 .inode = inode, 2516 }; 2517 int err; 2518 do { 2519 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel); 2520 trace_nfs4_setattr(inode, err); 2521 switch (err) { 2522 case -NFS4ERR_OPENMODE: 2523 if (!(sattr->ia_valid & ATTR_SIZE)) { 2524 pr_warn_once("NFSv4: server %s is incorrectly " 2525 "applying open mode checks to " 2526 "a SETATTR that is not " 2527 "changing file size.\n", 2528 server->nfs_client->cl_hostname); 2529 } 2530 if (state && !(state->state & FMODE_WRITE)) { 2531 err = -EBADF; 2532 if (sattr->ia_valid & ATTR_OPEN) 2533 err = -EACCES; 2534 goto out; 2535 } 2536 } 2537 err = nfs4_handle_exception(server, err, &exception); 2538 } while (exception.retry); 2539 out: 2540 return err; 2541 } 2542 2543 struct nfs4_closedata { 2544 struct inode *inode; 2545 struct nfs4_state *state; 2546 struct nfs_closeargs arg; 2547 struct nfs_closeres res; 2548 struct nfs_fattr fattr; 2549 unsigned long timestamp; 2550 bool roc; 2551 u32 roc_barrier; 2552 }; 2553 2554 static void nfs4_free_closedata(void *data) 2555 { 2556 struct nfs4_closedata *calldata = data; 2557 struct nfs4_state_owner *sp = calldata->state->owner; 2558 struct super_block *sb = calldata->state->inode->i_sb; 2559 2560 if (calldata->roc) 2561 pnfs_roc_release(calldata->state->inode); 2562 nfs4_put_open_state(calldata->state); 2563 nfs_free_seqid(calldata->arg.seqid); 2564 nfs4_put_state_owner(sp); 2565 nfs_sb_deactive(sb); 2566 kfree(calldata); 2567 } 2568 2569 static void nfs4_close_done(struct rpc_task *task, void *data) 2570 { 2571 struct nfs4_closedata *calldata = data; 2572 struct nfs4_state *state = calldata->state; 2573 struct nfs_server *server = NFS_SERVER(calldata->inode); 2574 nfs4_stateid *res_stateid = NULL; 2575 2576 dprintk("%s: begin!\n", __func__); 2577 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2578 return; 2579 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 2580 /* hmm. we are done with the inode, and in the process of freeing 2581 * the state_owner. we keep this around to process errors 2582 */ 2583 switch (task->tk_status) { 2584 case 0: 2585 res_stateid = &calldata->res.stateid; 2586 if (calldata->arg.fmode == 0 && calldata->roc) 2587 pnfs_roc_set_barrier(state->inode, 2588 calldata->roc_barrier); 2589 renew_lease(server, calldata->timestamp); 2590 break; 2591 case -NFS4ERR_ADMIN_REVOKED: 2592 case -NFS4ERR_STALE_STATEID: 2593 case -NFS4ERR_OLD_STATEID: 2594 case -NFS4ERR_BAD_STATEID: 2595 case -NFS4ERR_EXPIRED: 2596 if (calldata->arg.fmode == 0) 2597 break; 2598 default: 2599 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) { 2600 rpc_restart_call_prepare(task); 2601 goto out_release; 2602 } 2603 } 2604 nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode); 2605 out_release: 2606 nfs_release_seqid(calldata->arg.seqid); 2607 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2608 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2609 } 2610 2611 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2612 { 2613 struct nfs4_closedata *calldata = data; 2614 struct nfs4_state *state = calldata->state; 2615 struct inode *inode = calldata->inode; 2616 bool is_rdonly, is_wronly, is_rdwr; 2617 int call_close = 0; 2618 2619 dprintk("%s: begin!\n", __func__); 2620 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2621 goto out_wait; 2622 2623 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2624 spin_lock(&state->owner->so_lock); 2625 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 2626 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 2627 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 2628 /* Calculate the change in open mode */ 2629 calldata->arg.fmode = 0; 2630 if (state->n_rdwr == 0) { 2631 if (state->n_rdonly == 0) 2632 call_close |= is_rdonly; 2633 else if (is_rdonly) 2634 calldata->arg.fmode |= FMODE_READ; 2635 if (state->n_wronly == 0) 2636 call_close |= is_wronly; 2637 else if (is_wronly) 2638 calldata->arg.fmode |= FMODE_WRITE; 2639 } else if (is_rdwr) 2640 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 2641 2642 if (calldata->arg.fmode == 0) 2643 call_close |= is_rdwr; 2644 2645 if (!nfs4_valid_open_stateid(state)) 2646 call_close = 0; 2647 spin_unlock(&state->owner->so_lock); 2648 2649 if (!call_close) { 2650 /* Note: exit _without_ calling nfs4_close_done */ 2651 goto out_no_action; 2652 } 2653 2654 if (calldata->arg.fmode == 0) { 2655 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2656 if (calldata->roc && 2657 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) { 2658 nfs_release_seqid(calldata->arg.seqid); 2659 goto out_wait; 2660 } 2661 } 2662 2663 nfs_fattr_init(calldata->res.fattr); 2664 calldata->timestamp = jiffies; 2665 if (nfs4_setup_sequence(NFS_SERVER(inode), 2666 &calldata->arg.seq_args, 2667 &calldata->res.seq_res, 2668 task) != 0) 2669 nfs_release_seqid(calldata->arg.seqid); 2670 dprintk("%s: done!\n", __func__); 2671 return; 2672 out_no_action: 2673 task->tk_action = NULL; 2674 out_wait: 2675 nfs4_sequence_done(task, &calldata->res.seq_res); 2676 } 2677 2678 static const struct rpc_call_ops nfs4_close_ops = { 2679 .rpc_call_prepare = nfs4_close_prepare, 2680 .rpc_call_done = nfs4_close_done, 2681 .rpc_release = nfs4_free_closedata, 2682 }; 2683 2684 static bool nfs4_state_has_opener(struct nfs4_state *state) 2685 { 2686 /* first check existing openers */ 2687 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 && 2688 state->n_rdonly != 0) 2689 return true; 2690 2691 if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 && 2692 state->n_wronly != 0) 2693 return true; 2694 2695 if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 && 2696 state->n_rdwr != 0) 2697 return true; 2698 2699 return false; 2700 } 2701 2702 static bool nfs4_roc(struct inode *inode) 2703 { 2704 struct nfs_inode *nfsi = NFS_I(inode); 2705 struct nfs_open_context *ctx; 2706 struct nfs4_state *state; 2707 2708 spin_lock(&inode->i_lock); 2709 list_for_each_entry(ctx, &nfsi->open_files, list) { 2710 state = ctx->state; 2711 if (state == NULL) 2712 continue; 2713 if (nfs4_state_has_opener(state)) { 2714 spin_unlock(&inode->i_lock); 2715 return false; 2716 } 2717 } 2718 spin_unlock(&inode->i_lock); 2719 2720 if (nfs4_check_delegation(inode, FMODE_READ)) 2721 return false; 2722 2723 return pnfs_roc(inode); 2724 } 2725 2726 /* 2727 * It is possible for data to be read/written from a mem-mapped file 2728 * after the sys_close call (which hits the vfs layer as a flush). 2729 * This means that we can't safely call nfsv4 close on a file until 2730 * the inode is cleared. This in turn means that we are not good 2731 * NFSv4 citizens - we do not indicate to the server to update the file's 2732 * share state even when we are done with one of the three share 2733 * stateid's in the inode. 2734 * 2735 * NOTE: Caller must be holding the sp->so_owner semaphore! 2736 */ 2737 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2738 { 2739 struct nfs_server *server = NFS_SERVER(state->inode); 2740 struct nfs4_closedata *calldata; 2741 struct nfs4_state_owner *sp = state->owner; 2742 struct rpc_task *task; 2743 struct rpc_message msg = { 2744 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2745 .rpc_cred = state->owner->so_cred, 2746 }; 2747 struct rpc_task_setup task_setup_data = { 2748 .rpc_client = server->client, 2749 .rpc_message = &msg, 2750 .callback_ops = &nfs4_close_ops, 2751 .workqueue = nfsiod_workqueue, 2752 .flags = RPC_TASK_ASYNC, 2753 }; 2754 int status = -ENOMEM; 2755 2756 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 2757 &task_setup_data.rpc_client, &msg); 2758 2759 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2760 if (calldata == NULL) 2761 goto out; 2762 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2763 calldata->inode = state->inode; 2764 calldata->state = state; 2765 calldata->arg.fh = NFS_FH(state->inode); 2766 calldata->arg.stateid = &state->open_stateid; 2767 /* Serialization for the sequence id */ 2768 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask); 2769 if (calldata->arg.seqid == NULL) 2770 goto out_free_calldata; 2771 calldata->arg.fmode = 0; 2772 calldata->arg.bitmask = server->cache_consistency_bitmask; 2773 calldata->res.fattr = &calldata->fattr; 2774 calldata->res.seqid = calldata->arg.seqid; 2775 calldata->res.server = server; 2776 calldata->roc = nfs4_roc(state->inode); 2777 nfs_sb_active(calldata->inode->i_sb); 2778 2779 msg.rpc_argp = &calldata->arg; 2780 msg.rpc_resp = &calldata->res; 2781 task_setup_data.callback_data = calldata; 2782 task = rpc_run_task(&task_setup_data); 2783 if (IS_ERR(task)) 2784 return PTR_ERR(task); 2785 status = 0; 2786 if (wait) 2787 status = rpc_wait_for_completion_task(task); 2788 rpc_put_task(task); 2789 return status; 2790 out_free_calldata: 2791 kfree(calldata); 2792 out: 2793 nfs4_put_open_state(state); 2794 nfs4_put_state_owner(sp); 2795 return status; 2796 } 2797 2798 static struct inode * 2799 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 2800 int open_flags, struct iattr *attr, int *opened) 2801 { 2802 struct nfs4_state *state; 2803 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 2804 2805 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 2806 2807 /* Protect against concurrent sillydeletes */ 2808 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 2809 2810 nfs4_label_release_security(label); 2811 2812 if (IS_ERR(state)) 2813 return ERR_CAST(state); 2814 return state->inode; 2815 } 2816 2817 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 2818 { 2819 if (ctx->state == NULL) 2820 return; 2821 if (is_sync) 2822 nfs4_close_sync(ctx->state, ctx->mode); 2823 else 2824 nfs4_close_state(ctx->state, ctx->mode); 2825 } 2826 2827 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 2828 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 2829 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL) 2830 2831 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2832 { 2833 struct nfs4_server_caps_arg args = { 2834 .fhandle = fhandle, 2835 }; 2836 struct nfs4_server_caps_res res = {}; 2837 struct rpc_message msg = { 2838 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 2839 .rpc_argp = &args, 2840 .rpc_resp = &res, 2841 }; 2842 int status; 2843 2844 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2845 if (status == 0) { 2846 /* Sanity check the server answers */ 2847 switch (server->nfs_client->cl_minorversion) { 2848 case 0: 2849 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 2850 res.attr_bitmask[2] = 0; 2851 break; 2852 case 1: 2853 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 2854 break; 2855 case 2: 2856 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 2857 } 2858 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 2859 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 2860 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 2861 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 2862 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 2863 NFS_CAP_CTIME|NFS_CAP_MTIME| 2864 NFS_CAP_SECURITY_LABEL); 2865 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 2866 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 2867 server->caps |= NFS_CAP_ACLS; 2868 if (res.has_links != 0) 2869 server->caps |= NFS_CAP_HARDLINKS; 2870 if (res.has_symlinks != 0) 2871 server->caps |= NFS_CAP_SYMLINKS; 2872 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 2873 server->caps |= NFS_CAP_FILEID; 2874 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 2875 server->caps |= NFS_CAP_MODE; 2876 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 2877 server->caps |= NFS_CAP_NLINK; 2878 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 2879 server->caps |= NFS_CAP_OWNER; 2880 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 2881 server->caps |= NFS_CAP_OWNER_GROUP; 2882 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 2883 server->caps |= NFS_CAP_ATIME; 2884 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 2885 server->caps |= NFS_CAP_CTIME; 2886 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 2887 server->caps |= NFS_CAP_MTIME; 2888 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 2889 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 2890 server->caps |= NFS_CAP_SECURITY_LABEL; 2891 #endif 2892 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 2893 sizeof(server->attr_bitmask)); 2894 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2895 2896 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 2897 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 2898 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 2899 server->cache_consistency_bitmask[2] = 0; 2900 server->acl_bitmask = res.acl_bitmask; 2901 server->fh_expire_type = res.fh_expire_type; 2902 } 2903 2904 return status; 2905 } 2906 2907 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2908 { 2909 struct nfs4_exception exception = { }; 2910 int err; 2911 do { 2912 err = nfs4_handle_exception(server, 2913 _nfs4_server_capabilities(server, fhandle), 2914 &exception); 2915 } while (exception.retry); 2916 return err; 2917 } 2918 2919 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2920 struct nfs_fsinfo *info) 2921 { 2922 u32 bitmask[3]; 2923 struct nfs4_lookup_root_arg args = { 2924 .bitmask = bitmask, 2925 }; 2926 struct nfs4_lookup_res res = { 2927 .server = server, 2928 .fattr = info->fattr, 2929 .fh = fhandle, 2930 }; 2931 struct rpc_message msg = { 2932 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 2933 .rpc_argp = &args, 2934 .rpc_resp = &res, 2935 }; 2936 2937 bitmask[0] = nfs4_fattr_bitmap[0]; 2938 bitmask[1] = nfs4_fattr_bitmap[1]; 2939 /* 2940 * Process the label in the upcoming getfattr 2941 */ 2942 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 2943 2944 nfs_fattr_init(info->fattr); 2945 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2946 } 2947 2948 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2949 struct nfs_fsinfo *info) 2950 { 2951 struct nfs4_exception exception = { }; 2952 int err; 2953 do { 2954 err = _nfs4_lookup_root(server, fhandle, info); 2955 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 2956 switch (err) { 2957 case 0: 2958 case -NFS4ERR_WRONGSEC: 2959 goto out; 2960 default: 2961 err = nfs4_handle_exception(server, err, &exception); 2962 } 2963 } while (exception.retry); 2964 out: 2965 return err; 2966 } 2967 2968 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2969 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 2970 { 2971 struct rpc_auth_create_args auth_args = { 2972 .pseudoflavor = flavor, 2973 }; 2974 struct rpc_auth *auth; 2975 int ret; 2976 2977 auth = rpcauth_create(&auth_args, server->client); 2978 if (IS_ERR(auth)) { 2979 ret = -EACCES; 2980 goto out; 2981 } 2982 ret = nfs4_lookup_root(server, fhandle, info); 2983 out: 2984 return ret; 2985 } 2986 2987 /* 2988 * Retry pseudoroot lookup with various security flavors. We do this when: 2989 * 2990 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 2991 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 2992 * 2993 * Returns zero on success, or a negative NFS4ERR value, or a 2994 * negative errno value. 2995 */ 2996 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2997 struct nfs_fsinfo *info) 2998 { 2999 /* Per 3530bis 15.33.5 */ 3000 static const rpc_authflavor_t flav_array[] = { 3001 RPC_AUTH_GSS_KRB5P, 3002 RPC_AUTH_GSS_KRB5I, 3003 RPC_AUTH_GSS_KRB5, 3004 RPC_AUTH_UNIX, /* courtesy */ 3005 RPC_AUTH_NULL, 3006 }; 3007 int status = -EPERM; 3008 size_t i; 3009 3010 if (server->auth_info.flavor_len > 0) { 3011 /* try each flavor specified by user */ 3012 for (i = 0; i < server->auth_info.flavor_len; i++) { 3013 status = nfs4_lookup_root_sec(server, fhandle, info, 3014 server->auth_info.flavors[i]); 3015 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3016 continue; 3017 break; 3018 } 3019 } else { 3020 /* no flavors specified by user, try default list */ 3021 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3022 status = nfs4_lookup_root_sec(server, fhandle, info, 3023 flav_array[i]); 3024 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3025 continue; 3026 break; 3027 } 3028 } 3029 3030 /* 3031 * -EACCESS could mean that the user doesn't have correct permissions 3032 * to access the mount. It could also mean that we tried to mount 3033 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3034 * existing mount programs don't handle -EACCES very well so it should 3035 * be mapped to -EPERM instead. 3036 */ 3037 if (status == -EACCES) 3038 status = -EPERM; 3039 return status; 3040 } 3041 3042 static int nfs4_do_find_root_sec(struct nfs_server *server, 3043 struct nfs_fh *fhandle, struct nfs_fsinfo *info) 3044 { 3045 int mv = server->nfs_client->cl_minorversion; 3046 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info); 3047 } 3048 3049 /** 3050 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3051 * @server: initialized nfs_server handle 3052 * @fhandle: we fill in the pseudo-fs root file handle 3053 * @info: we fill in an FSINFO struct 3054 * @auth_probe: probe the auth flavours 3055 * 3056 * Returns zero on success, or a negative errno. 3057 */ 3058 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3059 struct nfs_fsinfo *info, 3060 bool auth_probe) 3061 { 3062 int status; 3063 3064 switch (auth_probe) { 3065 case false: 3066 status = nfs4_lookup_root(server, fhandle, info); 3067 if (status != -NFS4ERR_WRONGSEC) 3068 break; 3069 default: 3070 status = nfs4_do_find_root_sec(server, fhandle, info); 3071 } 3072 3073 if (status == 0) 3074 status = nfs4_server_capabilities(server, fhandle); 3075 if (status == 0) 3076 status = nfs4_do_fsinfo(server, fhandle, info); 3077 3078 return nfs4_map_errors(status); 3079 } 3080 3081 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3082 struct nfs_fsinfo *info) 3083 { 3084 int error; 3085 struct nfs_fattr *fattr = info->fattr; 3086 struct nfs4_label *label = NULL; 3087 3088 error = nfs4_server_capabilities(server, mntfh); 3089 if (error < 0) { 3090 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3091 return error; 3092 } 3093 3094 label = nfs4_label_alloc(server, GFP_KERNEL); 3095 if (IS_ERR(label)) 3096 return PTR_ERR(label); 3097 3098 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3099 if (error < 0) { 3100 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3101 goto err_free_label; 3102 } 3103 3104 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3105 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3106 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3107 3108 err_free_label: 3109 nfs4_label_free(label); 3110 3111 return error; 3112 } 3113 3114 /* 3115 * Get locations and (maybe) other attributes of a referral. 3116 * Note that we'll actually follow the referral later when 3117 * we detect fsid mismatch in inode revalidation 3118 */ 3119 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3120 const struct qstr *name, struct nfs_fattr *fattr, 3121 struct nfs_fh *fhandle) 3122 { 3123 int status = -ENOMEM; 3124 struct page *page = NULL; 3125 struct nfs4_fs_locations *locations = NULL; 3126 3127 page = alloc_page(GFP_KERNEL); 3128 if (page == NULL) 3129 goto out; 3130 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3131 if (locations == NULL) 3132 goto out; 3133 3134 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3135 if (status != 0) 3136 goto out; 3137 3138 /* 3139 * If the fsid didn't change, this is a migration event, not a 3140 * referral. Cause us to drop into the exception handler, which 3141 * will kick off migration recovery. 3142 */ 3143 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3144 dprintk("%s: server did not return a different fsid for" 3145 " a referral at %s\n", __func__, name->name); 3146 status = -NFS4ERR_MOVED; 3147 goto out; 3148 } 3149 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3150 nfs_fixup_referral_attributes(&locations->fattr); 3151 3152 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3153 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3154 memset(fhandle, 0, sizeof(struct nfs_fh)); 3155 out: 3156 if (page) 3157 __free_page(page); 3158 kfree(locations); 3159 return status; 3160 } 3161 3162 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3163 struct nfs_fattr *fattr, struct nfs4_label *label) 3164 { 3165 struct nfs4_getattr_arg args = { 3166 .fh = fhandle, 3167 .bitmask = server->attr_bitmask, 3168 }; 3169 struct nfs4_getattr_res res = { 3170 .fattr = fattr, 3171 .label = label, 3172 .server = server, 3173 }; 3174 struct rpc_message msg = { 3175 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3176 .rpc_argp = &args, 3177 .rpc_resp = &res, 3178 }; 3179 3180 args.bitmask = nfs4_bitmask(server, label); 3181 3182 nfs_fattr_init(fattr); 3183 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3184 } 3185 3186 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3187 struct nfs_fattr *fattr, struct nfs4_label *label) 3188 { 3189 struct nfs4_exception exception = { }; 3190 int err; 3191 do { 3192 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3193 trace_nfs4_getattr(server, fhandle, fattr, err); 3194 err = nfs4_handle_exception(server, err, 3195 &exception); 3196 } while (exception.retry); 3197 return err; 3198 } 3199 3200 /* 3201 * The file is not closed if it is opened due to the a request to change 3202 * the size of the file. The open call will not be needed once the 3203 * VFS layer lookup-intents are implemented. 3204 * 3205 * Close is called when the inode is destroyed. 3206 * If we haven't opened the file for O_WRONLY, we 3207 * need to in the size_change case to obtain a stateid. 3208 * 3209 * Got race? 3210 * Because OPEN is always done by name in nfsv4, it is 3211 * possible that we opened a different file by the same 3212 * name. We can recognize this race condition, but we 3213 * can't do anything about it besides returning an error. 3214 * 3215 * This will be fixed with VFS changes (lookup-intent). 3216 */ 3217 static int 3218 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3219 struct iattr *sattr) 3220 { 3221 struct inode *inode = dentry->d_inode; 3222 struct rpc_cred *cred = NULL; 3223 struct nfs4_state *state = NULL; 3224 struct nfs4_label *label = NULL; 3225 int status; 3226 3227 if (pnfs_ld_layoutret_on_setattr(inode) && 3228 sattr->ia_valid & ATTR_SIZE && 3229 sattr->ia_size < i_size_read(inode)) 3230 pnfs_commit_and_return_layout(inode); 3231 3232 nfs_fattr_init(fattr); 3233 3234 /* Deal with open(O_TRUNC) */ 3235 if (sattr->ia_valid & ATTR_OPEN) 3236 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3237 3238 /* Optimization: if the end result is no change, don't RPC */ 3239 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3240 return 0; 3241 3242 /* Search for an existing open(O_WRITE) file */ 3243 if (sattr->ia_valid & ATTR_FILE) { 3244 struct nfs_open_context *ctx; 3245 3246 ctx = nfs_file_open_context(sattr->ia_file); 3247 if (ctx) { 3248 cred = ctx->cred; 3249 state = ctx->state; 3250 } 3251 } 3252 3253 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3254 if (IS_ERR(label)) 3255 return PTR_ERR(label); 3256 3257 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label); 3258 if (status == 0) { 3259 nfs_setattr_update_inode(inode, sattr); 3260 nfs_setsecurity(inode, fattr, label); 3261 } 3262 nfs4_label_free(label); 3263 return status; 3264 } 3265 3266 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3267 const struct qstr *name, struct nfs_fh *fhandle, 3268 struct nfs_fattr *fattr, struct nfs4_label *label) 3269 { 3270 struct nfs_server *server = NFS_SERVER(dir); 3271 int status; 3272 struct nfs4_lookup_arg args = { 3273 .bitmask = server->attr_bitmask, 3274 .dir_fh = NFS_FH(dir), 3275 .name = name, 3276 }; 3277 struct nfs4_lookup_res res = { 3278 .server = server, 3279 .fattr = fattr, 3280 .label = label, 3281 .fh = fhandle, 3282 }; 3283 struct rpc_message msg = { 3284 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3285 .rpc_argp = &args, 3286 .rpc_resp = &res, 3287 }; 3288 3289 args.bitmask = nfs4_bitmask(server, label); 3290 3291 nfs_fattr_init(fattr); 3292 3293 dprintk("NFS call lookup %s\n", name->name); 3294 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3295 dprintk("NFS reply lookup: %d\n", status); 3296 return status; 3297 } 3298 3299 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3300 { 3301 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3302 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3303 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3304 fattr->nlink = 2; 3305 } 3306 3307 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3308 struct qstr *name, struct nfs_fh *fhandle, 3309 struct nfs_fattr *fattr, struct nfs4_label *label) 3310 { 3311 struct nfs4_exception exception = { }; 3312 struct rpc_clnt *client = *clnt; 3313 int err; 3314 do { 3315 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3316 trace_nfs4_lookup(dir, name, err); 3317 switch (err) { 3318 case -NFS4ERR_BADNAME: 3319 err = -ENOENT; 3320 goto out; 3321 case -NFS4ERR_MOVED: 3322 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3323 goto out; 3324 case -NFS4ERR_WRONGSEC: 3325 err = -EPERM; 3326 if (client != *clnt) 3327 goto out; 3328 client = nfs4_negotiate_security(client, dir, name); 3329 if (IS_ERR(client)) 3330 return PTR_ERR(client); 3331 3332 exception.retry = 1; 3333 break; 3334 default: 3335 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3336 } 3337 } while (exception.retry); 3338 3339 out: 3340 if (err == 0) 3341 *clnt = client; 3342 else if (client != *clnt) 3343 rpc_shutdown_client(client); 3344 3345 return err; 3346 } 3347 3348 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, 3349 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3350 struct nfs4_label *label) 3351 { 3352 int status; 3353 struct rpc_clnt *client = NFS_CLIENT(dir); 3354 3355 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3356 if (client != NFS_CLIENT(dir)) { 3357 rpc_shutdown_client(client); 3358 nfs_fixup_secinfo_attributes(fattr); 3359 } 3360 return status; 3361 } 3362 3363 struct rpc_clnt * 3364 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name, 3365 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3366 { 3367 struct rpc_clnt *client = NFS_CLIENT(dir); 3368 int status; 3369 3370 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3371 if (status < 0) 3372 return ERR_PTR(status); 3373 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3374 } 3375 3376 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3377 { 3378 struct nfs_server *server = NFS_SERVER(inode); 3379 struct nfs4_accessargs args = { 3380 .fh = NFS_FH(inode), 3381 .bitmask = server->cache_consistency_bitmask, 3382 }; 3383 struct nfs4_accessres res = { 3384 .server = server, 3385 }; 3386 struct rpc_message msg = { 3387 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 3388 .rpc_argp = &args, 3389 .rpc_resp = &res, 3390 .rpc_cred = entry->cred, 3391 }; 3392 int mode = entry->mask; 3393 int status = 0; 3394 3395 /* 3396 * Determine which access bits we want to ask for... 3397 */ 3398 if (mode & MAY_READ) 3399 args.access |= NFS4_ACCESS_READ; 3400 if (S_ISDIR(inode->i_mode)) { 3401 if (mode & MAY_WRITE) 3402 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 3403 if (mode & MAY_EXEC) 3404 args.access |= NFS4_ACCESS_LOOKUP; 3405 } else { 3406 if (mode & MAY_WRITE) 3407 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 3408 if (mode & MAY_EXEC) 3409 args.access |= NFS4_ACCESS_EXECUTE; 3410 } 3411 3412 res.fattr = nfs_alloc_fattr(); 3413 if (res.fattr == NULL) 3414 return -ENOMEM; 3415 3416 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3417 if (!status) { 3418 nfs_access_set_mask(entry, res.access); 3419 nfs_refresh_inode(inode, res.fattr); 3420 } 3421 nfs_free_fattr(res.fattr); 3422 return status; 3423 } 3424 3425 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3426 { 3427 struct nfs4_exception exception = { }; 3428 int err; 3429 do { 3430 err = _nfs4_proc_access(inode, entry); 3431 trace_nfs4_access(inode, err); 3432 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3433 &exception); 3434 } while (exception.retry); 3435 return err; 3436 } 3437 3438 /* 3439 * TODO: For the time being, we don't try to get any attributes 3440 * along with any of the zero-copy operations READ, READDIR, 3441 * READLINK, WRITE. 3442 * 3443 * In the case of the first three, we want to put the GETATTR 3444 * after the read-type operation -- this is because it is hard 3445 * to predict the length of a GETATTR response in v4, and thus 3446 * align the READ data correctly. This means that the GETATTR 3447 * may end up partially falling into the page cache, and we should 3448 * shift it into the 'tail' of the xdr_buf before processing. 3449 * To do this efficiently, we need to know the total length 3450 * of data received, which doesn't seem to be available outside 3451 * of the RPC layer. 3452 * 3453 * In the case of WRITE, we also want to put the GETATTR after 3454 * the operation -- in this case because we want to make sure 3455 * we get the post-operation mtime and size. 3456 * 3457 * Both of these changes to the XDR layer would in fact be quite 3458 * minor, but I decided to leave them for a subsequent patch. 3459 */ 3460 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 3461 unsigned int pgbase, unsigned int pglen) 3462 { 3463 struct nfs4_readlink args = { 3464 .fh = NFS_FH(inode), 3465 .pgbase = pgbase, 3466 .pglen = pglen, 3467 .pages = &page, 3468 }; 3469 struct nfs4_readlink_res res; 3470 struct rpc_message msg = { 3471 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 3472 .rpc_argp = &args, 3473 .rpc_resp = &res, 3474 }; 3475 3476 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 3477 } 3478 3479 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 3480 unsigned int pgbase, unsigned int pglen) 3481 { 3482 struct nfs4_exception exception = { }; 3483 int err; 3484 do { 3485 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 3486 trace_nfs4_readlink(inode, err); 3487 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3488 &exception); 3489 } while (exception.retry); 3490 return err; 3491 } 3492 3493 /* 3494 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 3495 */ 3496 static int 3497 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 3498 int flags) 3499 { 3500 struct nfs4_label l, *ilabel = NULL; 3501 struct nfs_open_context *ctx; 3502 struct nfs4_state *state; 3503 int opened = 0; 3504 int status = 0; 3505 3506 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 3507 if (IS_ERR(ctx)) 3508 return PTR_ERR(ctx); 3509 3510 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 3511 3512 sattr->ia_mode &= ~current_umask(); 3513 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened); 3514 if (IS_ERR(state)) { 3515 status = PTR_ERR(state); 3516 goto out; 3517 } 3518 out: 3519 nfs4_label_release_security(ilabel); 3520 put_nfs_open_context(ctx); 3521 return status; 3522 } 3523 3524 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 3525 { 3526 struct nfs_server *server = NFS_SERVER(dir); 3527 struct nfs_removeargs args = { 3528 .fh = NFS_FH(dir), 3529 .name = *name, 3530 }; 3531 struct nfs_removeres res = { 3532 .server = server, 3533 }; 3534 struct rpc_message msg = { 3535 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 3536 .rpc_argp = &args, 3537 .rpc_resp = &res, 3538 }; 3539 int status; 3540 3541 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 3542 if (status == 0) 3543 update_changeattr(dir, &res.cinfo); 3544 return status; 3545 } 3546 3547 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 3548 { 3549 struct nfs4_exception exception = { }; 3550 int err; 3551 do { 3552 err = _nfs4_proc_remove(dir, name); 3553 trace_nfs4_remove(dir, name, err); 3554 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3555 &exception); 3556 } while (exception.retry); 3557 return err; 3558 } 3559 3560 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 3561 { 3562 struct nfs_server *server = NFS_SERVER(dir); 3563 struct nfs_removeargs *args = msg->rpc_argp; 3564 struct nfs_removeres *res = msg->rpc_resp; 3565 3566 res->server = server; 3567 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 3568 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 3569 3570 nfs_fattr_init(res->dir_attr); 3571 } 3572 3573 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 3574 { 3575 nfs4_setup_sequence(NFS_SERVER(data->dir), 3576 &data->args.seq_args, 3577 &data->res.seq_res, 3578 task); 3579 } 3580 3581 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 3582 { 3583 struct nfs_unlinkdata *data = task->tk_calldata; 3584 struct nfs_removeres *res = &data->res; 3585 3586 if (!nfs4_sequence_done(task, &res->seq_res)) 3587 return 0; 3588 if (nfs4_async_handle_error(task, res->server, NULL, 3589 &data->timeout) == -EAGAIN) 3590 return 0; 3591 update_changeattr(dir, &res->cinfo); 3592 return 1; 3593 } 3594 3595 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 3596 { 3597 struct nfs_server *server = NFS_SERVER(dir); 3598 struct nfs_renameargs *arg = msg->rpc_argp; 3599 struct nfs_renameres *res = msg->rpc_resp; 3600 3601 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 3602 res->server = server; 3603 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 3604 } 3605 3606 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 3607 { 3608 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 3609 &data->args.seq_args, 3610 &data->res.seq_res, 3611 task); 3612 } 3613 3614 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 3615 struct inode *new_dir) 3616 { 3617 struct nfs_renamedata *data = task->tk_calldata; 3618 struct nfs_renameres *res = &data->res; 3619 3620 if (!nfs4_sequence_done(task, &res->seq_res)) 3621 return 0; 3622 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 3623 return 0; 3624 3625 update_changeattr(old_dir, &res->old_cinfo); 3626 update_changeattr(new_dir, &res->new_cinfo); 3627 return 1; 3628 } 3629 3630 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3631 { 3632 struct nfs_server *server = NFS_SERVER(inode); 3633 struct nfs4_link_arg arg = { 3634 .fh = NFS_FH(inode), 3635 .dir_fh = NFS_FH(dir), 3636 .name = name, 3637 .bitmask = server->attr_bitmask, 3638 }; 3639 struct nfs4_link_res res = { 3640 .server = server, 3641 .label = NULL, 3642 }; 3643 struct rpc_message msg = { 3644 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3645 .rpc_argp = &arg, 3646 .rpc_resp = &res, 3647 }; 3648 int status = -ENOMEM; 3649 3650 res.fattr = nfs_alloc_fattr(); 3651 if (res.fattr == NULL) 3652 goto out; 3653 3654 res.label = nfs4_label_alloc(server, GFP_KERNEL); 3655 if (IS_ERR(res.label)) { 3656 status = PTR_ERR(res.label); 3657 goto out; 3658 } 3659 arg.bitmask = nfs4_bitmask(server, res.label); 3660 3661 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3662 if (!status) { 3663 update_changeattr(dir, &res.cinfo); 3664 status = nfs_post_op_update_inode(inode, res.fattr); 3665 if (!status) 3666 nfs_setsecurity(inode, res.fattr, res.label); 3667 } 3668 3669 3670 nfs4_label_free(res.label); 3671 3672 out: 3673 nfs_free_fattr(res.fattr); 3674 return status; 3675 } 3676 3677 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3678 { 3679 struct nfs4_exception exception = { }; 3680 int err; 3681 do { 3682 err = nfs4_handle_exception(NFS_SERVER(inode), 3683 _nfs4_proc_link(inode, dir, name), 3684 &exception); 3685 } while (exception.retry); 3686 return err; 3687 } 3688 3689 struct nfs4_createdata { 3690 struct rpc_message msg; 3691 struct nfs4_create_arg arg; 3692 struct nfs4_create_res res; 3693 struct nfs_fh fh; 3694 struct nfs_fattr fattr; 3695 struct nfs4_label *label; 3696 }; 3697 3698 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3699 struct qstr *name, struct iattr *sattr, u32 ftype) 3700 { 3701 struct nfs4_createdata *data; 3702 3703 data = kzalloc(sizeof(*data), GFP_KERNEL); 3704 if (data != NULL) { 3705 struct nfs_server *server = NFS_SERVER(dir); 3706 3707 data->label = nfs4_label_alloc(server, GFP_KERNEL); 3708 if (IS_ERR(data->label)) 3709 goto out_free; 3710 3711 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3712 data->msg.rpc_argp = &data->arg; 3713 data->msg.rpc_resp = &data->res; 3714 data->arg.dir_fh = NFS_FH(dir); 3715 data->arg.server = server; 3716 data->arg.name = name; 3717 data->arg.attrs = sattr; 3718 data->arg.ftype = ftype; 3719 data->arg.bitmask = nfs4_bitmask(server, data->label); 3720 data->res.server = server; 3721 data->res.fh = &data->fh; 3722 data->res.fattr = &data->fattr; 3723 data->res.label = data->label; 3724 nfs_fattr_init(data->res.fattr); 3725 } 3726 return data; 3727 out_free: 3728 kfree(data); 3729 return NULL; 3730 } 3731 3732 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3733 { 3734 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3735 &data->arg.seq_args, &data->res.seq_res, 1); 3736 if (status == 0) { 3737 update_changeattr(dir, &data->res.dir_cinfo); 3738 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 3739 } 3740 return status; 3741 } 3742 3743 static void nfs4_free_createdata(struct nfs4_createdata *data) 3744 { 3745 nfs4_label_free(data->label); 3746 kfree(data); 3747 } 3748 3749 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3750 struct page *page, unsigned int len, struct iattr *sattr, 3751 struct nfs4_label *label) 3752 { 3753 struct nfs4_createdata *data; 3754 int status = -ENAMETOOLONG; 3755 3756 if (len > NFS4_MAXPATHLEN) 3757 goto out; 3758 3759 status = -ENOMEM; 3760 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3761 if (data == NULL) 3762 goto out; 3763 3764 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3765 data->arg.u.symlink.pages = &page; 3766 data->arg.u.symlink.len = len; 3767 data->arg.label = label; 3768 3769 status = nfs4_do_create(dir, dentry, data); 3770 3771 nfs4_free_createdata(data); 3772 out: 3773 return status; 3774 } 3775 3776 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3777 struct page *page, unsigned int len, struct iattr *sattr) 3778 { 3779 struct nfs4_exception exception = { }; 3780 struct nfs4_label l, *label = NULL; 3781 int err; 3782 3783 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3784 3785 do { 3786 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 3787 trace_nfs4_symlink(dir, &dentry->d_name, err); 3788 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3789 &exception); 3790 } while (exception.retry); 3791 3792 nfs4_label_release_security(label); 3793 return err; 3794 } 3795 3796 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3797 struct iattr *sattr, struct nfs4_label *label) 3798 { 3799 struct nfs4_createdata *data; 3800 int status = -ENOMEM; 3801 3802 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 3803 if (data == NULL) 3804 goto out; 3805 3806 data->arg.label = label; 3807 status = nfs4_do_create(dir, dentry, data); 3808 3809 nfs4_free_createdata(data); 3810 out: 3811 return status; 3812 } 3813 3814 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3815 struct iattr *sattr) 3816 { 3817 struct nfs4_exception exception = { }; 3818 struct nfs4_label l, *label = NULL; 3819 int err; 3820 3821 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3822 3823 sattr->ia_mode &= ~current_umask(); 3824 do { 3825 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 3826 trace_nfs4_mkdir(dir, &dentry->d_name, err); 3827 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3828 &exception); 3829 } while (exception.retry); 3830 nfs4_label_release_security(label); 3831 3832 return err; 3833 } 3834 3835 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3836 u64 cookie, struct page **pages, unsigned int count, int plus) 3837 { 3838 struct inode *dir = dentry->d_inode; 3839 struct nfs4_readdir_arg args = { 3840 .fh = NFS_FH(dir), 3841 .pages = pages, 3842 .pgbase = 0, 3843 .count = count, 3844 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 3845 .plus = plus, 3846 }; 3847 struct nfs4_readdir_res res; 3848 struct rpc_message msg = { 3849 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 3850 .rpc_argp = &args, 3851 .rpc_resp = &res, 3852 .rpc_cred = cred, 3853 }; 3854 int status; 3855 3856 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 3857 dentry, 3858 (unsigned long long)cookie); 3859 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 3860 res.pgbase = args.pgbase; 3861 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 3862 if (status >= 0) { 3863 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 3864 status += args.pgbase; 3865 } 3866 3867 nfs_invalidate_atime(dir); 3868 3869 dprintk("%s: returns %d\n", __func__, status); 3870 return status; 3871 } 3872 3873 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3874 u64 cookie, struct page **pages, unsigned int count, int plus) 3875 { 3876 struct nfs4_exception exception = { }; 3877 int err; 3878 do { 3879 err = _nfs4_proc_readdir(dentry, cred, cookie, 3880 pages, count, plus); 3881 trace_nfs4_readdir(dentry->d_inode, err); 3882 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err, 3883 &exception); 3884 } while (exception.retry); 3885 return err; 3886 } 3887 3888 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3889 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 3890 { 3891 struct nfs4_createdata *data; 3892 int mode = sattr->ia_mode; 3893 int status = -ENOMEM; 3894 3895 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 3896 if (data == NULL) 3897 goto out; 3898 3899 if (S_ISFIFO(mode)) 3900 data->arg.ftype = NF4FIFO; 3901 else if (S_ISBLK(mode)) { 3902 data->arg.ftype = NF4BLK; 3903 data->arg.u.device.specdata1 = MAJOR(rdev); 3904 data->arg.u.device.specdata2 = MINOR(rdev); 3905 } 3906 else if (S_ISCHR(mode)) { 3907 data->arg.ftype = NF4CHR; 3908 data->arg.u.device.specdata1 = MAJOR(rdev); 3909 data->arg.u.device.specdata2 = MINOR(rdev); 3910 } else if (!S_ISSOCK(mode)) { 3911 status = -EINVAL; 3912 goto out_free; 3913 } 3914 3915 data->arg.label = label; 3916 status = nfs4_do_create(dir, dentry, data); 3917 out_free: 3918 nfs4_free_createdata(data); 3919 out: 3920 return status; 3921 } 3922 3923 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3924 struct iattr *sattr, dev_t rdev) 3925 { 3926 struct nfs4_exception exception = { }; 3927 struct nfs4_label l, *label = NULL; 3928 int err; 3929 3930 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3931 3932 sattr->ia_mode &= ~current_umask(); 3933 do { 3934 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 3935 trace_nfs4_mknod(dir, &dentry->d_name, err); 3936 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3937 &exception); 3938 } while (exception.retry); 3939 3940 nfs4_label_release_security(label); 3941 3942 return err; 3943 } 3944 3945 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 3946 struct nfs_fsstat *fsstat) 3947 { 3948 struct nfs4_statfs_arg args = { 3949 .fh = fhandle, 3950 .bitmask = server->attr_bitmask, 3951 }; 3952 struct nfs4_statfs_res res = { 3953 .fsstat = fsstat, 3954 }; 3955 struct rpc_message msg = { 3956 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 3957 .rpc_argp = &args, 3958 .rpc_resp = &res, 3959 }; 3960 3961 nfs_fattr_init(fsstat->fattr); 3962 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3963 } 3964 3965 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 3966 { 3967 struct nfs4_exception exception = { }; 3968 int err; 3969 do { 3970 err = nfs4_handle_exception(server, 3971 _nfs4_proc_statfs(server, fhandle, fsstat), 3972 &exception); 3973 } while (exception.retry); 3974 return err; 3975 } 3976 3977 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 3978 struct nfs_fsinfo *fsinfo) 3979 { 3980 struct nfs4_fsinfo_arg args = { 3981 .fh = fhandle, 3982 .bitmask = server->attr_bitmask, 3983 }; 3984 struct nfs4_fsinfo_res res = { 3985 .fsinfo = fsinfo, 3986 }; 3987 struct rpc_message msg = { 3988 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 3989 .rpc_argp = &args, 3990 .rpc_resp = &res, 3991 }; 3992 3993 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3994 } 3995 3996 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3997 { 3998 struct nfs4_exception exception = { }; 3999 unsigned long now = jiffies; 4000 int err; 4001 4002 do { 4003 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 4004 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 4005 if (err == 0) { 4006 struct nfs_client *clp = server->nfs_client; 4007 4008 spin_lock(&clp->cl_lock); 4009 clp->cl_lease_time = fsinfo->lease_time * HZ; 4010 clp->cl_last_renewal = now; 4011 spin_unlock(&clp->cl_lock); 4012 break; 4013 } 4014 err = nfs4_handle_exception(server, err, &exception); 4015 } while (exception.retry); 4016 return err; 4017 } 4018 4019 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 4020 { 4021 int error; 4022 4023 nfs_fattr_init(fsinfo->fattr); 4024 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4025 if (error == 0) { 4026 /* block layout checks this! */ 4027 server->pnfs_blksize = fsinfo->blksize; 4028 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 4029 } 4030 4031 return error; 4032 } 4033 4034 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4035 struct nfs_pathconf *pathconf) 4036 { 4037 struct nfs4_pathconf_arg args = { 4038 .fh = fhandle, 4039 .bitmask = server->attr_bitmask, 4040 }; 4041 struct nfs4_pathconf_res res = { 4042 .pathconf = pathconf, 4043 }; 4044 struct rpc_message msg = { 4045 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4046 .rpc_argp = &args, 4047 .rpc_resp = &res, 4048 }; 4049 4050 /* None of the pathconf attributes are mandatory to implement */ 4051 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4052 memset(pathconf, 0, sizeof(*pathconf)); 4053 return 0; 4054 } 4055 4056 nfs_fattr_init(pathconf->fattr); 4057 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4058 } 4059 4060 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4061 struct nfs_pathconf *pathconf) 4062 { 4063 struct nfs4_exception exception = { }; 4064 int err; 4065 4066 do { 4067 err = nfs4_handle_exception(server, 4068 _nfs4_proc_pathconf(server, fhandle, pathconf), 4069 &exception); 4070 } while (exception.retry); 4071 return err; 4072 } 4073 4074 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4075 const struct nfs_open_context *ctx, 4076 const struct nfs_lock_context *l_ctx, 4077 fmode_t fmode) 4078 { 4079 const struct nfs_lockowner *lockowner = NULL; 4080 4081 if (l_ctx != NULL) 4082 lockowner = &l_ctx->lockowner; 4083 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner); 4084 } 4085 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4086 4087 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4088 const struct nfs_open_context *ctx, 4089 const struct nfs_lock_context *l_ctx, 4090 fmode_t fmode) 4091 { 4092 nfs4_stateid current_stateid; 4093 4094 /* If the current stateid represents a lost lock, then exit */ 4095 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4096 return true; 4097 return nfs4_stateid_match(stateid, ¤t_stateid); 4098 } 4099 4100 static bool nfs4_error_stateid_expired(int err) 4101 { 4102 switch (err) { 4103 case -NFS4ERR_DELEG_REVOKED: 4104 case -NFS4ERR_ADMIN_REVOKED: 4105 case -NFS4ERR_BAD_STATEID: 4106 case -NFS4ERR_STALE_STATEID: 4107 case -NFS4ERR_OLD_STATEID: 4108 case -NFS4ERR_OPENMODE: 4109 case -NFS4ERR_EXPIRED: 4110 return true; 4111 } 4112 return false; 4113 } 4114 4115 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr) 4116 { 4117 nfs_invalidate_atime(hdr->inode); 4118 } 4119 4120 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4121 { 4122 struct nfs_server *server = NFS_SERVER(hdr->inode); 4123 4124 trace_nfs4_read(hdr, task->tk_status); 4125 if (nfs4_async_handle_error(task, server, 4126 hdr->args.context->state, 4127 NULL) == -EAGAIN) { 4128 rpc_restart_call_prepare(task); 4129 return -EAGAIN; 4130 } 4131 4132 __nfs4_read_done_cb(hdr); 4133 if (task->tk_status > 0) 4134 renew_lease(server, hdr->timestamp); 4135 return 0; 4136 } 4137 4138 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4139 struct nfs_pgio_args *args) 4140 { 4141 4142 if (!nfs4_error_stateid_expired(task->tk_status) || 4143 nfs4_stateid_is_current(&args->stateid, 4144 args->context, 4145 args->lock_context, 4146 FMODE_READ)) 4147 return false; 4148 rpc_restart_call_prepare(task); 4149 return true; 4150 } 4151 4152 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4153 { 4154 4155 dprintk("--> %s\n", __func__); 4156 4157 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4158 return -EAGAIN; 4159 if (nfs4_read_stateid_changed(task, &hdr->args)) 4160 return -EAGAIN; 4161 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4162 nfs4_read_done_cb(task, hdr); 4163 } 4164 4165 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4166 struct rpc_message *msg) 4167 { 4168 hdr->timestamp = jiffies; 4169 hdr->pgio_done_cb = nfs4_read_done_cb; 4170 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4171 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); 4172 } 4173 4174 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4175 struct nfs_pgio_header *hdr) 4176 { 4177 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode), 4178 &hdr->args.seq_args, 4179 &hdr->res.seq_res, 4180 task)) 4181 return 0; 4182 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4183 hdr->args.lock_context, 4184 hdr->rw_ops->rw_mode) == -EIO) 4185 return -EIO; 4186 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4187 return -EIO; 4188 return 0; 4189 } 4190 4191 static int nfs4_write_done_cb(struct rpc_task *task, 4192 struct nfs_pgio_header *hdr) 4193 { 4194 struct inode *inode = hdr->inode; 4195 4196 trace_nfs4_write(hdr, task->tk_status); 4197 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4198 hdr->args.context->state, 4199 NULL) == -EAGAIN) { 4200 rpc_restart_call_prepare(task); 4201 return -EAGAIN; 4202 } 4203 if (task->tk_status >= 0) { 4204 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4205 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr); 4206 } 4207 return 0; 4208 } 4209 4210 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4211 struct nfs_pgio_args *args) 4212 { 4213 4214 if (!nfs4_error_stateid_expired(task->tk_status) || 4215 nfs4_stateid_is_current(&args->stateid, 4216 args->context, 4217 args->lock_context, 4218 FMODE_WRITE)) 4219 return false; 4220 rpc_restart_call_prepare(task); 4221 return true; 4222 } 4223 4224 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4225 { 4226 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4227 return -EAGAIN; 4228 if (nfs4_write_stateid_changed(task, &hdr->args)) 4229 return -EAGAIN; 4230 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4231 nfs4_write_done_cb(task, hdr); 4232 } 4233 4234 static 4235 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4236 { 4237 /* Don't request attributes for pNFS or O_DIRECT writes */ 4238 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4239 return false; 4240 /* Otherwise, request attributes if and only if we don't hold 4241 * a delegation 4242 */ 4243 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4244 } 4245 4246 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4247 struct rpc_message *msg) 4248 { 4249 struct nfs_server *server = NFS_SERVER(hdr->inode); 4250 4251 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4252 hdr->args.bitmask = NULL; 4253 hdr->res.fattr = NULL; 4254 } else 4255 hdr->args.bitmask = server->cache_consistency_bitmask; 4256 4257 if (!hdr->pgio_done_cb) 4258 hdr->pgio_done_cb = nfs4_write_done_cb; 4259 hdr->res.server = server; 4260 hdr->timestamp = jiffies; 4261 4262 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4263 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1); 4264 } 4265 4266 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4267 { 4268 nfs4_setup_sequence(NFS_SERVER(data->inode), 4269 &data->args.seq_args, 4270 &data->res.seq_res, 4271 task); 4272 } 4273 4274 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4275 { 4276 struct inode *inode = data->inode; 4277 4278 trace_nfs4_commit(data, task->tk_status); 4279 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4280 NULL, NULL) == -EAGAIN) { 4281 rpc_restart_call_prepare(task); 4282 return -EAGAIN; 4283 } 4284 return 0; 4285 } 4286 4287 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4288 { 4289 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4290 return -EAGAIN; 4291 return data->commit_done_cb(task, data); 4292 } 4293 4294 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4295 { 4296 struct nfs_server *server = NFS_SERVER(data->inode); 4297 4298 if (data->commit_done_cb == NULL) 4299 data->commit_done_cb = nfs4_commit_done_cb; 4300 data->res.server = server; 4301 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4302 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4303 } 4304 4305 struct nfs4_renewdata { 4306 struct nfs_client *client; 4307 unsigned long timestamp; 4308 }; 4309 4310 /* 4311 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4312 * standalone procedure for queueing an asynchronous RENEW. 4313 */ 4314 static void nfs4_renew_release(void *calldata) 4315 { 4316 struct nfs4_renewdata *data = calldata; 4317 struct nfs_client *clp = data->client; 4318 4319 if (atomic_read(&clp->cl_count) > 1) 4320 nfs4_schedule_state_renewal(clp); 4321 nfs_put_client(clp); 4322 kfree(data); 4323 } 4324 4325 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4326 { 4327 struct nfs4_renewdata *data = calldata; 4328 struct nfs_client *clp = data->client; 4329 unsigned long timestamp = data->timestamp; 4330 4331 trace_nfs4_renew_async(clp, task->tk_status); 4332 switch (task->tk_status) { 4333 case 0: 4334 break; 4335 case -NFS4ERR_LEASE_MOVED: 4336 nfs4_schedule_lease_moved_recovery(clp); 4337 break; 4338 default: 4339 /* Unless we're shutting down, schedule state recovery! */ 4340 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 4341 return; 4342 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 4343 nfs4_schedule_lease_recovery(clp); 4344 return; 4345 } 4346 nfs4_schedule_path_down_recovery(clp); 4347 } 4348 do_renew_lease(clp, timestamp); 4349 } 4350 4351 static const struct rpc_call_ops nfs4_renew_ops = { 4352 .rpc_call_done = nfs4_renew_done, 4353 .rpc_release = nfs4_renew_release, 4354 }; 4355 4356 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 4357 { 4358 struct rpc_message msg = { 4359 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4360 .rpc_argp = clp, 4361 .rpc_cred = cred, 4362 }; 4363 struct nfs4_renewdata *data; 4364 4365 if (renew_flags == 0) 4366 return 0; 4367 if (!atomic_inc_not_zero(&clp->cl_count)) 4368 return -EIO; 4369 data = kmalloc(sizeof(*data), GFP_NOFS); 4370 if (data == NULL) 4371 return -ENOMEM; 4372 data->client = clp; 4373 data->timestamp = jiffies; 4374 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 4375 &nfs4_renew_ops, data); 4376 } 4377 4378 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 4379 { 4380 struct rpc_message msg = { 4381 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4382 .rpc_argp = clp, 4383 .rpc_cred = cred, 4384 }; 4385 unsigned long now = jiffies; 4386 int status; 4387 4388 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4389 if (status < 0) 4390 return status; 4391 do_renew_lease(clp, now); 4392 return 0; 4393 } 4394 4395 static inline int nfs4_server_supports_acls(struct nfs_server *server) 4396 { 4397 return server->caps & NFS_CAP_ACLS; 4398 } 4399 4400 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 4401 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 4402 * the stack. 4403 */ 4404 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 4405 4406 static int buf_to_pages_noslab(const void *buf, size_t buflen, 4407 struct page **pages, unsigned int *pgbase) 4408 { 4409 struct page *newpage, **spages; 4410 int rc = 0; 4411 size_t len; 4412 spages = pages; 4413 4414 do { 4415 len = min_t(size_t, PAGE_SIZE, buflen); 4416 newpage = alloc_page(GFP_KERNEL); 4417 4418 if (newpage == NULL) 4419 goto unwind; 4420 memcpy(page_address(newpage), buf, len); 4421 buf += len; 4422 buflen -= len; 4423 *pages++ = newpage; 4424 rc++; 4425 } while (buflen != 0); 4426 4427 return rc; 4428 4429 unwind: 4430 for(; rc > 0; rc--) 4431 __free_page(spages[rc-1]); 4432 return -ENOMEM; 4433 } 4434 4435 struct nfs4_cached_acl { 4436 int cached; 4437 size_t len; 4438 char data[0]; 4439 }; 4440 4441 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 4442 { 4443 struct nfs_inode *nfsi = NFS_I(inode); 4444 4445 spin_lock(&inode->i_lock); 4446 kfree(nfsi->nfs4_acl); 4447 nfsi->nfs4_acl = acl; 4448 spin_unlock(&inode->i_lock); 4449 } 4450 4451 static void nfs4_zap_acl_attr(struct inode *inode) 4452 { 4453 nfs4_set_cached_acl(inode, NULL); 4454 } 4455 4456 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 4457 { 4458 struct nfs_inode *nfsi = NFS_I(inode); 4459 struct nfs4_cached_acl *acl; 4460 int ret = -ENOENT; 4461 4462 spin_lock(&inode->i_lock); 4463 acl = nfsi->nfs4_acl; 4464 if (acl == NULL) 4465 goto out; 4466 if (buf == NULL) /* user is just asking for length */ 4467 goto out_len; 4468 if (acl->cached == 0) 4469 goto out; 4470 ret = -ERANGE; /* see getxattr(2) man page */ 4471 if (acl->len > buflen) 4472 goto out; 4473 memcpy(buf, acl->data, acl->len); 4474 out_len: 4475 ret = acl->len; 4476 out: 4477 spin_unlock(&inode->i_lock); 4478 return ret; 4479 } 4480 4481 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 4482 { 4483 struct nfs4_cached_acl *acl; 4484 size_t buflen = sizeof(*acl) + acl_len; 4485 4486 if (buflen <= PAGE_SIZE) { 4487 acl = kmalloc(buflen, GFP_KERNEL); 4488 if (acl == NULL) 4489 goto out; 4490 acl->cached = 1; 4491 _copy_from_pages(acl->data, pages, pgbase, acl_len); 4492 } else { 4493 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 4494 if (acl == NULL) 4495 goto out; 4496 acl->cached = 0; 4497 } 4498 acl->len = acl_len; 4499 out: 4500 nfs4_set_cached_acl(inode, acl); 4501 } 4502 4503 /* 4504 * The getxattr API returns the required buffer length when called with a 4505 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 4506 * the required buf. On a NULL buf, we send a page of data to the server 4507 * guessing that the ACL request can be serviced by a page. If so, we cache 4508 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 4509 * the cache. If not so, we throw away the page, and cache the required 4510 * length. The next getxattr call will then produce another round trip to 4511 * the server, this time with the input buf of the required size. 4512 */ 4513 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4514 { 4515 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 4516 struct nfs_getaclargs args = { 4517 .fh = NFS_FH(inode), 4518 .acl_pages = pages, 4519 .acl_len = buflen, 4520 }; 4521 struct nfs_getaclres res = { 4522 .acl_len = buflen, 4523 }; 4524 struct rpc_message msg = { 4525 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 4526 .rpc_argp = &args, 4527 .rpc_resp = &res, 4528 }; 4529 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4530 int ret = -ENOMEM, i; 4531 4532 /* As long as we're doing a round trip to the server anyway, 4533 * let's be prepared for a page of acl data. */ 4534 if (npages == 0) 4535 npages = 1; 4536 if (npages > ARRAY_SIZE(pages)) 4537 return -ERANGE; 4538 4539 for (i = 0; i < npages; i++) { 4540 pages[i] = alloc_page(GFP_KERNEL); 4541 if (!pages[i]) 4542 goto out_free; 4543 } 4544 4545 /* for decoding across pages */ 4546 res.acl_scratch = alloc_page(GFP_KERNEL); 4547 if (!res.acl_scratch) 4548 goto out_free; 4549 4550 args.acl_len = npages * PAGE_SIZE; 4551 args.acl_pgbase = 0; 4552 4553 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 4554 __func__, buf, buflen, npages, args.acl_len); 4555 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 4556 &msg, &args.seq_args, &res.seq_res, 0); 4557 if (ret) 4558 goto out_free; 4559 4560 /* Handle the case where the passed-in buffer is too short */ 4561 if (res.acl_flags & NFS4_ACL_TRUNC) { 4562 /* Did the user only issue a request for the acl length? */ 4563 if (buf == NULL) 4564 goto out_ok; 4565 ret = -ERANGE; 4566 goto out_free; 4567 } 4568 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 4569 if (buf) { 4570 if (res.acl_len > buflen) { 4571 ret = -ERANGE; 4572 goto out_free; 4573 } 4574 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 4575 } 4576 out_ok: 4577 ret = res.acl_len; 4578 out_free: 4579 for (i = 0; i < npages; i++) 4580 if (pages[i]) 4581 __free_page(pages[i]); 4582 if (res.acl_scratch) 4583 __free_page(res.acl_scratch); 4584 return ret; 4585 } 4586 4587 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4588 { 4589 struct nfs4_exception exception = { }; 4590 ssize_t ret; 4591 do { 4592 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 4593 trace_nfs4_get_acl(inode, ret); 4594 if (ret >= 0) 4595 break; 4596 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 4597 } while (exception.retry); 4598 return ret; 4599 } 4600 4601 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 4602 { 4603 struct nfs_server *server = NFS_SERVER(inode); 4604 int ret; 4605 4606 if (!nfs4_server_supports_acls(server)) 4607 return -EOPNOTSUPP; 4608 ret = nfs_revalidate_inode(server, inode); 4609 if (ret < 0) 4610 return ret; 4611 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 4612 nfs_zap_acl_cache(inode); 4613 ret = nfs4_read_cached_acl(inode, buf, buflen); 4614 if (ret != -ENOENT) 4615 /* -ENOENT is returned if there is no ACL or if there is an ACL 4616 * but no cached acl data, just the acl length */ 4617 return ret; 4618 return nfs4_get_acl_uncached(inode, buf, buflen); 4619 } 4620 4621 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4622 { 4623 struct nfs_server *server = NFS_SERVER(inode); 4624 struct page *pages[NFS4ACL_MAXPAGES]; 4625 struct nfs_setaclargs arg = { 4626 .fh = NFS_FH(inode), 4627 .acl_pages = pages, 4628 .acl_len = buflen, 4629 }; 4630 struct nfs_setaclres res; 4631 struct rpc_message msg = { 4632 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 4633 .rpc_argp = &arg, 4634 .rpc_resp = &res, 4635 }; 4636 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4637 int ret, i; 4638 4639 if (!nfs4_server_supports_acls(server)) 4640 return -EOPNOTSUPP; 4641 if (npages > ARRAY_SIZE(pages)) 4642 return -ERANGE; 4643 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 4644 if (i < 0) 4645 return i; 4646 nfs4_inode_return_delegation(inode); 4647 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4648 4649 /* 4650 * Free each page after tx, so the only ref left is 4651 * held by the network stack 4652 */ 4653 for (; i > 0; i--) 4654 put_page(pages[i-1]); 4655 4656 /* 4657 * Acl update can result in inode attribute update. 4658 * so mark the attribute cache invalid. 4659 */ 4660 spin_lock(&inode->i_lock); 4661 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 4662 spin_unlock(&inode->i_lock); 4663 nfs_access_zap_cache(inode); 4664 nfs_zap_acl_cache(inode); 4665 return ret; 4666 } 4667 4668 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4669 { 4670 struct nfs4_exception exception = { }; 4671 int err; 4672 do { 4673 err = __nfs4_proc_set_acl(inode, buf, buflen); 4674 trace_nfs4_set_acl(inode, err); 4675 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4676 &exception); 4677 } while (exception.retry); 4678 return err; 4679 } 4680 4681 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 4682 static int _nfs4_get_security_label(struct inode *inode, void *buf, 4683 size_t buflen) 4684 { 4685 struct nfs_server *server = NFS_SERVER(inode); 4686 struct nfs_fattr fattr; 4687 struct nfs4_label label = {0, 0, buflen, buf}; 4688 4689 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4690 struct nfs4_getattr_arg arg = { 4691 .fh = NFS_FH(inode), 4692 .bitmask = bitmask, 4693 }; 4694 struct nfs4_getattr_res res = { 4695 .fattr = &fattr, 4696 .label = &label, 4697 .server = server, 4698 }; 4699 struct rpc_message msg = { 4700 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4701 .rpc_argp = &arg, 4702 .rpc_resp = &res, 4703 }; 4704 int ret; 4705 4706 nfs_fattr_init(&fattr); 4707 4708 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 4709 if (ret) 4710 return ret; 4711 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 4712 return -ENOENT; 4713 if (buflen < label.len) 4714 return -ERANGE; 4715 return 0; 4716 } 4717 4718 static int nfs4_get_security_label(struct inode *inode, void *buf, 4719 size_t buflen) 4720 { 4721 struct nfs4_exception exception = { }; 4722 int err; 4723 4724 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4725 return -EOPNOTSUPP; 4726 4727 do { 4728 err = _nfs4_get_security_label(inode, buf, buflen); 4729 trace_nfs4_get_security_label(inode, err); 4730 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4731 &exception); 4732 } while (exception.retry); 4733 return err; 4734 } 4735 4736 static int _nfs4_do_set_security_label(struct inode *inode, 4737 struct nfs4_label *ilabel, 4738 struct nfs_fattr *fattr, 4739 struct nfs4_label *olabel) 4740 { 4741 4742 struct iattr sattr = {0}; 4743 struct nfs_server *server = NFS_SERVER(inode); 4744 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4745 struct nfs_setattrargs arg = { 4746 .fh = NFS_FH(inode), 4747 .iap = &sattr, 4748 .server = server, 4749 .bitmask = bitmask, 4750 .label = ilabel, 4751 }; 4752 struct nfs_setattrres res = { 4753 .fattr = fattr, 4754 .label = olabel, 4755 .server = server, 4756 }; 4757 struct rpc_message msg = { 4758 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 4759 .rpc_argp = &arg, 4760 .rpc_resp = &res, 4761 }; 4762 int status; 4763 4764 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 4765 4766 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4767 if (status) 4768 dprintk("%s failed: %d\n", __func__, status); 4769 4770 return status; 4771 } 4772 4773 static int nfs4_do_set_security_label(struct inode *inode, 4774 struct nfs4_label *ilabel, 4775 struct nfs_fattr *fattr, 4776 struct nfs4_label *olabel) 4777 { 4778 struct nfs4_exception exception = { }; 4779 int err; 4780 4781 do { 4782 err = _nfs4_do_set_security_label(inode, ilabel, 4783 fattr, olabel); 4784 trace_nfs4_set_security_label(inode, err); 4785 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4786 &exception); 4787 } while (exception.retry); 4788 return err; 4789 } 4790 4791 static int 4792 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen) 4793 { 4794 struct nfs4_label ilabel, *olabel = NULL; 4795 struct nfs_fattr fattr; 4796 struct rpc_cred *cred; 4797 struct inode *inode = dentry->d_inode; 4798 int status; 4799 4800 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4801 return -EOPNOTSUPP; 4802 4803 nfs_fattr_init(&fattr); 4804 4805 ilabel.pi = 0; 4806 ilabel.lfs = 0; 4807 ilabel.label = (char *)buf; 4808 ilabel.len = buflen; 4809 4810 cred = rpc_lookup_cred(); 4811 if (IS_ERR(cred)) 4812 return PTR_ERR(cred); 4813 4814 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 4815 if (IS_ERR(olabel)) { 4816 status = -PTR_ERR(olabel); 4817 goto out; 4818 } 4819 4820 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 4821 if (status == 0) 4822 nfs_setsecurity(inode, &fattr, olabel); 4823 4824 nfs4_label_free(olabel); 4825 out: 4826 put_rpccred(cred); 4827 return status; 4828 } 4829 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 4830 4831 4832 static int 4833 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, 4834 struct nfs4_state *state, long *timeout) 4835 { 4836 struct nfs_client *clp = server->nfs_client; 4837 4838 if (task->tk_status >= 0) 4839 return 0; 4840 switch(task->tk_status) { 4841 case -NFS4ERR_DELEG_REVOKED: 4842 case -NFS4ERR_ADMIN_REVOKED: 4843 case -NFS4ERR_BAD_STATEID: 4844 if (state == NULL) 4845 break; 4846 nfs_remove_bad_delegation(state->inode); 4847 case -NFS4ERR_OPENMODE: 4848 if (state == NULL) 4849 break; 4850 if (nfs4_schedule_stateid_recovery(server, state) < 0) 4851 goto recovery_failed; 4852 goto wait_on_recovery; 4853 case -NFS4ERR_EXPIRED: 4854 if (state != NULL) { 4855 if (nfs4_schedule_stateid_recovery(server, state) < 0) 4856 goto recovery_failed; 4857 } 4858 case -NFS4ERR_STALE_STATEID: 4859 case -NFS4ERR_STALE_CLIENTID: 4860 nfs4_schedule_lease_recovery(clp); 4861 goto wait_on_recovery; 4862 case -NFS4ERR_MOVED: 4863 if (nfs4_schedule_migration_recovery(server) < 0) 4864 goto recovery_failed; 4865 goto wait_on_recovery; 4866 case -NFS4ERR_LEASE_MOVED: 4867 nfs4_schedule_lease_moved_recovery(clp); 4868 goto wait_on_recovery; 4869 #if defined(CONFIG_NFS_V4_1) 4870 case -NFS4ERR_BADSESSION: 4871 case -NFS4ERR_BADSLOT: 4872 case -NFS4ERR_BAD_HIGH_SLOT: 4873 case -NFS4ERR_DEADSESSION: 4874 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 4875 case -NFS4ERR_SEQ_FALSE_RETRY: 4876 case -NFS4ERR_SEQ_MISORDERED: 4877 dprintk("%s ERROR %d, Reset session\n", __func__, 4878 task->tk_status); 4879 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 4880 goto wait_on_recovery; 4881 #endif /* CONFIG_NFS_V4_1 */ 4882 case -NFS4ERR_DELAY: 4883 nfs_inc_server_stats(server, NFSIOS_DELAY); 4884 rpc_delay(task, nfs4_update_delay(timeout)); 4885 goto restart_call; 4886 case -NFS4ERR_GRACE: 4887 rpc_delay(task, NFS4_POLL_RETRY_MAX); 4888 case -NFS4ERR_RETRY_UNCACHED_REP: 4889 case -NFS4ERR_OLD_STATEID: 4890 goto restart_call; 4891 } 4892 task->tk_status = nfs4_map_errors(task->tk_status); 4893 return 0; 4894 recovery_failed: 4895 task->tk_status = -EIO; 4896 return 0; 4897 wait_on_recovery: 4898 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 4899 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 4900 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 4901 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 4902 goto recovery_failed; 4903 restart_call: 4904 task->tk_status = 0; 4905 return -EAGAIN; 4906 } 4907 4908 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 4909 nfs4_verifier *bootverf) 4910 { 4911 __be32 verf[2]; 4912 4913 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 4914 /* An impossible timestamp guarantees this value 4915 * will never match a generated boot time. */ 4916 verf[0] = 0; 4917 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1); 4918 } else { 4919 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 4920 verf[0] = cpu_to_be32(nn->boot_time.tv_sec); 4921 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec); 4922 } 4923 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 4924 } 4925 4926 static unsigned int 4927 nfs4_init_nonuniform_client_string(const struct nfs_client *clp, 4928 char *buf, size_t len) 4929 { 4930 unsigned int result; 4931 4932 rcu_read_lock(); 4933 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s", 4934 clp->cl_ipaddr, 4935 rpc_peeraddr2str(clp->cl_rpcclient, 4936 RPC_DISPLAY_ADDR), 4937 rpc_peeraddr2str(clp->cl_rpcclient, 4938 RPC_DISPLAY_PROTO)); 4939 rcu_read_unlock(); 4940 return result; 4941 } 4942 4943 static unsigned int 4944 nfs4_init_uniform_client_string(const struct nfs_client *clp, 4945 char *buf, size_t len) 4946 { 4947 const char *nodename = clp->cl_rpcclient->cl_nodename; 4948 4949 if (nfs4_client_id_uniquifier[0] != '\0') 4950 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s", 4951 clp->rpc_ops->version, 4952 clp->cl_minorversion, 4953 nfs4_client_id_uniquifier, 4954 nodename); 4955 return scnprintf(buf, len, "Linux NFSv%u.%u %s", 4956 clp->rpc_ops->version, clp->cl_minorversion, 4957 nodename); 4958 } 4959 4960 /* 4961 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 4962 * services. Advertise one based on the address family of the 4963 * clientaddr. 4964 */ 4965 static unsigned int 4966 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 4967 { 4968 if (strchr(clp->cl_ipaddr, ':') != NULL) 4969 return scnprintf(buf, len, "tcp6"); 4970 else 4971 return scnprintf(buf, len, "tcp"); 4972 } 4973 4974 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 4975 { 4976 struct nfs4_setclientid *sc = calldata; 4977 4978 if (task->tk_status == 0) 4979 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 4980 } 4981 4982 static const struct rpc_call_ops nfs4_setclientid_ops = { 4983 .rpc_call_done = nfs4_setclientid_done, 4984 }; 4985 4986 /** 4987 * nfs4_proc_setclientid - Negotiate client ID 4988 * @clp: state data structure 4989 * @program: RPC program for NFSv4 callback service 4990 * @port: IP port number for NFS4 callback service 4991 * @cred: RPC credential to use for this call 4992 * @res: where to place the result 4993 * 4994 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4995 */ 4996 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 4997 unsigned short port, struct rpc_cred *cred, 4998 struct nfs4_setclientid_res *res) 4999 { 5000 nfs4_verifier sc_verifier; 5001 struct nfs4_setclientid setclientid = { 5002 .sc_verifier = &sc_verifier, 5003 .sc_prog = program, 5004 .sc_cb_ident = clp->cl_cb_ident, 5005 }; 5006 struct rpc_message msg = { 5007 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 5008 .rpc_argp = &setclientid, 5009 .rpc_resp = res, 5010 .rpc_cred = cred, 5011 }; 5012 struct rpc_task *task; 5013 struct rpc_task_setup task_setup_data = { 5014 .rpc_client = clp->cl_rpcclient, 5015 .rpc_message = &msg, 5016 .callback_ops = &nfs4_setclientid_ops, 5017 .callback_data = &setclientid, 5018 .flags = RPC_TASK_TIMEOUT, 5019 }; 5020 int status; 5021 5022 /* nfs_client_id4 */ 5023 nfs4_init_boot_verifier(clp, &sc_verifier); 5024 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 5025 setclientid.sc_name_len = 5026 nfs4_init_uniform_client_string(clp, 5027 setclientid.sc_name, 5028 sizeof(setclientid.sc_name)); 5029 else 5030 setclientid.sc_name_len = 5031 nfs4_init_nonuniform_client_string(clp, 5032 setclientid.sc_name, 5033 sizeof(setclientid.sc_name)); 5034 /* cb_client4 */ 5035 setclientid.sc_netid_len = 5036 nfs4_init_callback_netid(clp, 5037 setclientid.sc_netid, 5038 sizeof(setclientid.sc_netid)); 5039 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5040 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5041 clp->cl_ipaddr, port >> 8, port & 255); 5042 5043 dprintk("NFS call setclientid auth=%s, '%.*s'\n", 5044 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5045 setclientid.sc_name_len, setclientid.sc_name); 5046 task = rpc_run_task(&task_setup_data); 5047 if (IS_ERR(task)) { 5048 status = PTR_ERR(task); 5049 goto out; 5050 } 5051 status = task->tk_status; 5052 if (setclientid.sc_cred) { 5053 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5054 put_rpccred(setclientid.sc_cred); 5055 } 5056 rpc_put_task(task); 5057 out: 5058 trace_nfs4_setclientid(clp, status); 5059 dprintk("NFS reply setclientid: %d\n", status); 5060 return status; 5061 } 5062 5063 /** 5064 * nfs4_proc_setclientid_confirm - Confirm client ID 5065 * @clp: state data structure 5066 * @res: result of a previous SETCLIENTID 5067 * @cred: RPC credential to use for this call 5068 * 5069 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5070 */ 5071 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5072 struct nfs4_setclientid_res *arg, 5073 struct rpc_cred *cred) 5074 { 5075 struct rpc_message msg = { 5076 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5077 .rpc_argp = arg, 5078 .rpc_cred = cred, 5079 }; 5080 int status; 5081 5082 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5083 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5084 clp->cl_clientid); 5085 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5086 trace_nfs4_setclientid_confirm(clp, status); 5087 dprintk("NFS reply setclientid_confirm: %d\n", status); 5088 return status; 5089 } 5090 5091 struct nfs4_delegreturndata { 5092 struct nfs4_delegreturnargs args; 5093 struct nfs4_delegreturnres res; 5094 struct nfs_fh fh; 5095 nfs4_stateid stateid; 5096 unsigned long timestamp; 5097 struct nfs_fattr fattr; 5098 int rpc_status; 5099 struct inode *inode; 5100 bool roc; 5101 u32 roc_barrier; 5102 }; 5103 5104 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5105 { 5106 struct nfs4_delegreturndata *data = calldata; 5107 5108 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5109 return; 5110 5111 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5112 switch (task->tk_status) { 5113 case 0: 5114 renew_lease(data->res.server, data->timestamp); 5115 case -NFS4ERR_ADMIN_REVOKED: 5116 case -NFS4ERR_DELEG_REVOKED: 5117 case -NFS4ERR_BAD_STATEID: 5118 case -NFS4ERR_OLD_STATEID: 5119 case -NFS4ERR_STALE_STATEID: 5120 case -NFS4ERR_EXPIRED: 5121 task->tk_status = 0; 5122 if (data->roc) 5123 pnfs_roc_set_barrier(data->inode, data->roc_barrier); 5124 break; 5125 default: 5126 if (nfs4_async_handle_error(task, data->res.server, 5127 NULL, NULL) == -EAGAIN) { 5128 rpc_restart_call_prepare(task); 5129 return; 5130 } 5131 } 5132 data->rpc_status = task->tk_status; 5133 } 5134 5135 static void nfs4_delegreturn_release(void *calldata) 5136 { 5137 struct nfs4_delegreturndata *data = calldata; 5138 5139 if (data->roc) 5140 pnfs_roc_release(data->inode); 5141 kfree(calldata); 5142 } 5143 5144 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5145 { 5146 struct nfs4_delegreturndata *d_data; 5147 5148 d_data = (struct nfs4_delegreturndata *)data; 5149 5150 if (d_data->roc && 5151 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task)) 5152 return; 5153 5154 nfs4_setup_sequence(d_data->res.server, 5155 &d_data->args.seq_args, 5156 &d_data->res.seq_res, 5157 task); 5158 } 5159 5160 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5161 .rpc_call_prepare = nfs4_delegreturn_prepare, 5162 .rpc_call_done = nfs4_delegreturn_done, 5163 .rpc_release = nfs4_delegreturn_release, 5164 }; 5165 5166 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5167 { 5168 struct nfs4_delegreturndata *data; 5169 struct nfs_server *server = NFS_SERVER(inode); 5170 struct rpc_task *task; 5171 struct rpc_message msg = { 5172 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5173 .rpc_cred = cred, 5174 }; 5175 struct rpc_task_setup task_setup_data = { 5176 .rpc_client = server->client, 5177 .rpc_message = &msg, 5178 .callback_ops = &nfs4_delegreturn_ops, 5179 .flags = RPC_TASK_ASYNC, 5180 }; 5181 int status = 0; 5182 5183 data = kzalloc(sizeof(*data), GFP_NOFS); 5184 if (data == NULL) 5185 return -ENOMEM; 5186 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5187 data->args.fhandle = &data->fh; 5188 data->args.stateid = &data->stateid; 5189 data->args.bitmask = server->cache_consistency_bitmask; 5190 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5191 nfs4_stateid_copy(&data->stateid, stateid); 5192 data->res.fattr = &data->fattr; 5193 data->res.server = server; 5194 nfs_fattr_init(data->res.fattr); 5195 data->timestamp = jiffies; 5196 data->rpc_status = 0; 5197 data->inode = inode; 5198 data->roc = list_empty(&NFS_I(inode)->open_files) ? 5199 pnfs_roc(inode) : false; 5200 5201 task_setup_data.callback_data = data; 5202 msg.rpc_argp = &data->args; 5203 msg.rpc_resp = &data->res; 5204 task = rpc_run_task(&task_setup_data); 5205 if (IS_ERR(task)) 5206 return PTR_ERR(task); 5207 if (!issync) 5208 goto out; 5209 status = nfs4_wait_for_completion_rpc_task(task); 5210 if (status != 0) 5211 goto out; 5212 status = data->rpc_status; 5213 if (status == 0) 5214 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5215 else 5216 nfs_refresh_inode(inode, &data->fattr); 5217 out: 5218 rpc_put_task(task); 5219 return status; 5220 } 5221 5222 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5223 { 5224 struct nfs_server *server = NFS_SERVER(inode); 5225 struct nfs4_exception exception = { }; 5226 int err; 5227 do { 5228 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5229 trace_nfs4_delegreturn(inode, err); 5230 switch (err) { 5231 case -NFS4ERR_STALE_STATEID: 5232 case -NFS4ERR_EXPIRED: 5233 case 0: 5234 return 0; 5235 } 5236 err = nfs4_handle_exception(server, err, &exception); 5237 } while (exception.retry); 5238 return err; 5239 } 5240 5241 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 5242 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 5243 5244 /* 5245 * sleep, with exponential backoff, and retry the LOCK operation. 5246 */ 5247 static unsigned long 5248 nfs4_set_lock_task_retry(unsigned long timeout) 5249 { 5250 freezable_schedule_timeout_killable_unsafe(timeout); 5251 timeout <<= 1; 5252 if (timeout > NFS4_LOCK_MAXTIMEOUT) 5253 return NFS4_LOCK_MAXTIMEOUT; 5254 return timeout; 5255 } 5256 5257 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5258 { 5259 struct inode *inode = state->inode; 5260 struct nfs_server *server = NFS_SERVER(inode); 5261 struct nfs_client *clp = server->nfs_client; 5262 struct nfs_lockt_args arg = { 5263 .fh = NFS_FH(inode), 5264 .fl = request, 5265 }; 5266 struct nfs_lockt_res res = { 5267 .denied = request, 5268 }; 5269 struct rpc_message msg = { 5270 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5271 .rpc_argp = &arg, 5272 .rpc_resp = &res, 5273 .rpc_cred = state->owner->so_cred, 5274 }; 5275 struct nfs4_lock_state *lsp; 5276 int status; 5277 5278 arg.lock_owner.clientid = clp->cl_clientid; 5279 status = nfs4_set_lock_state(state, request); 5280 if (status != 0) 5281 goto out; 5282 lsp = request->fl_u.nfs4_fl.owner; 5283 arg.lock_owner.id = lsp->ls_seqid.owner_id; 5284 arg.lock_owner.s_dev = server->s_dev; 5285 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5286 switch (status) { 5287 case 0: 5288 request->fl_type = F_UNLCK; 5289 break; 5290 case -NFS4ERR_DENIED: 5291 status = 0; 5292 } 5293 request->fl_ops->fl_release_private(request); 5294 request->fl_ops = NULL; 5295 out: 5296 return status; 5297 } 5298 5299 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5300 { 5301 struct nfs4_exception exception = { }; 5302 int err; 5303 5304 do { 5305 err = _nfs4_proc_getlk(state, cmd, request); 5306 trace_nfs4_get_lock(request, state, cmd, err); 5307 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 5308 &exception); 5309 } while (exception.retry); 5310 return err; 5311 } 5312 5313 static int do_vfs_lock(struct file *file, struct file_lock *fl) 5314 { 5315 int res = 0; 5316 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 5317 case FL_POSIX: 5318 res = posix_lock_file_wait(file, fl); 5319 break; 5320 case FL_FLOCK: 5321 res = flock_lock_file_wait(file, fl); 5322 break; 5323 default: 5324 BUG(); 5325 } 5326 return res; 5327 } 5328 5329 struct nfs4_unlockdata { 5330 struct nfs_locku_args arg; 5331 struct nfs_locku_res res; 5332 struct nfs4_lock_state *lsp; 5333 struct nfs_open_context *ctx; 5334 struct file_lock fl; 5335 const struct nfs_server *server; 5336 unsigned long timestamp; 5337 }; 5338 5339 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 5340 struct nfs_open_context *ctx, 5341 struct nfs4_lock_state *lsp, 5342 struct nfs_seqid *seqid) 5343 { 5344 struct nfs4_unlockdata *p; 5345 struct inode *inode = lsp->ls_state->inode; 5346 5347 p = kzalloc(sizeof(*p), GFP_NOFS); 5348 if (p == NULL) 5349 return NULL; 5350 p->arg.fh = NFS_FH(inode); 5351 p->arg.fl = &p->fl; 5352 p->arg.seqid = seqid; 5353 p->res.seqid = seqid; 5354 p->arg.stateid = &lsp->ls_stateid; 5355 p->lsp = lsp; 5356 atomic_inc(&lsp->ls_count); 5357 /* Ensure we don't close file until we're done freeing locks! */ 5358 p->ctx = get_nfs_open_context(ctx); 5359 memcpy(&p->fl, fl, sizeof(p->fl)); 5360 p->server = NFS_SERVER(inode); 5361 return p; 5362 } 5363 5364 static void nfs4_locku_release_calldata(void *data) 5365 { 5366 struct nfs4_unlockdata *calldata = data; 5367 nfs_free_seqid(calldata->arg.seqid); 5368 nfs4_put_lock_state(calldata->lsp); 5369 put_nfs_open_context(calldata->ctx); 5370 kfree(calldata); 5371 } 5372 5373 static void nfs4_locku_done(struct rpc_task *task, void *data) 5374 { 5375 struct nfs4_unlockdata *calldata = data; 5376 5377 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 5378 return; 5379 switch (task->tk_status) { 5380 case 0: 5381 nfs4_stateid_copy(&calldata->lsp->ls_stateid, 5382 &calldata->res.stateid); 5383 renew_lease(calldata->server, calldata->timestamp); 5384 break; 5385 case -NFS4ERR_BAD_STATEID: 5386 case -NFS4ERR_OLD_STATEID: 5387 case -NFS4ERR_STALE_STATEID: 5388 case -NFS4ERR_EXPIRED: 5389 break; 5390 default: 5391 if (nfs4_async_handle_error(task, calldata->server, 5392 NULL, NULL) == -EAGAIN) 5393 rpc_restart_call_prepare(task); 5394 } 5395 nfs_release_seqid(calldata->arg.seqid); 5396 } 5397 5398 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 5399 { 5400 struct nfs4_unlockdata *calldata = data; 5401 5402 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 5403 goto out_wait; 5404 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 5405 /* Note: exit _without_ running nfs4_locku_done */ 5406 goto out_no_action; 5407 } 5408 calldata->timestamp = jiffies; 5409 if (nfs4_setup_sequence(calldata->server, 5410 &calldata->arg.seq_args, 5411 &calldata->res.seq_res, 5412 task) != 0) 5413 nfs_release_seqid(calldata->arg.seqid); 5414 return; 5415 out_no_action: 5416 task->tk_action = NULL; 5417 out_wait: 5418 nfs4_sequence_done(task, &calldata->res.seq_res); 5419 } 5420 5421 static const struct rpc_call_ops nfs4_locku_ops = { 5422 .rpc_call_prepare = nfs4_locku_prepare, 5423 .rpc_call_done = nfs4_locku_done, 5424 .rpc_release = nfs4_locku_release_calldata, 5425 }; 5426 5427 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 5428 struct nfs_open_context *ctx, 5429 struct nfs4_lock_state *lsp, 5430 struct nfs_seqid *seqid) 5431 { 5432 struct nfs4_unlockdata *data; 5433 struct rpc_message msg = { 5434 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 5435 .rpc_cred = ctx->cred, 5436 }; 5437 struct rpc_task_setup task_setup_data = { 5438 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 5439 .rpc_message = &msg, 5440 .callback_ops = &nfs4_locku_ops, 5441 .workqueue = nfsiod_workqueue, 5442 .flags = RPC_TASK_ASYNC, 5443 }; 5444 5445 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 5446 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 5447 5448 /* Ensure this is an unlock - when canceling a lock, the 5449 * canceled lock is passed in, and it won't be an unlock. 5450 */ 5451 fl->fl_type = F_UNLCK; 5452 5453 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 5454 if (data == NULL) { 5455 nfs_free_seqid(seqid); 5456 return ERR_PTR(-ENOMEM); 5457 } 5458 5459 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5460 msg.rpc_argp = &data->arg; 5461 msg.rpc_resp = &data->res; 5462 task_setup_data.callback_data = data; 5463 return rpc_run_task(&task_setup_data); 5464 } 5465 5466 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 5467 { 5468 struct inode *inode = state->inode; 5469 struct nfs4_state_owner *sp = state->owner; 5470 struct nfs_inode *nfsi = NFS_I(inode); 5471 struct nfs_seqid *seqid; 5472 struct nfs4_lock_state *lsp; 5473 struct rpc_task *task; 5474 int status = 0; 5475 unsigned char fl_flags = request->fl_flags; 5476 5477 status = nfs4_set_lock_state(state, request); 5478 /* Unlock _before_ we do the RPC call */ 5479 request->fl_flags |= FL_EXISTS; 5480 /* Exclude nfs_delegation_claim_locks() */ 5481 mutex_lock(&sp->so_delegreturn_mutex); 5482 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 5483 down_read(&nfsi->rwsem); 5484 if (do_vfs_lock(request->fl_file, request) == -ENOENT) { 5485 up_read(&nfsi->rwsem); 5486 mutex_unlock(&sp->so_delegreturn_mutex); 5487 goto out; 5488 } 5489 up_read(&nfsi->rwsem); 5490 mutex_unlock(&sp->so_delegreturn_mutex); 5491 if (status != 0) 5492 goto out; 5493 /* Is this a delegated lock? */ 5494 lsp = request->fl_u.nfs4_fl.owner; 5495 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 5496 goto out; 5497 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 5498 status = -ENOMEM; 5499 if (seqid == NULL) 5500 goto out; 5501 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 5502 status = PTR_ERR(task); 5503 if (IS_ERR(task)) 5504 goto out; 5505 status = nfs4_wait_for_completion_rpc_task(task); 5506 rpc_put_task(task); 5507 out: 5508 request->fl_flags = fl_flags; 5509 trace_nfs4_unlock(request, state, F_SETLK, status); 5510 return status; 5511 } 5512 5513 struct nfs4_lockdata { 5514 struct nfs_lock_args arg; 5515 struct nfs_lock_res res; 5516 struct nfs4_lock_state *lsp; 5517 struct nfs_open_context *ctx; 5518 struct file_lock fl; 5519 unsigned long timestamp; 5520 int rpc_status; 5521 int cancelled; 5522 struct nfs_server *server; 5523 }; 5524 5525 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 5526 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 5527 gfp_t gfp_mask) 5528 { 5529 struct nfs4_lockdata *p; 5530 struct inode *inode = lsp->ls_state->inode; 5531 struct nfs_server *server = NFS_SERVER(inode); 5532 5533 p = kzalloc(sizeof(*p), gfp_mask); 5534 if (p == NULL) 5535 return NULL; 5536 5537 p->arg.fh = NFS_FH(inode); 5538 p->arg.fl = &p->fl; 5539 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 5540 if (p->arg.open_seqid == NULL) 5541 goto out_free; 5542 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask); 5543 if (p->arg.lock_seqid == NULL) 5544 goto out_free_seqid; 5545 p->arg.lock_stateid = &lsp->ls_stateid; 5546 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 5547 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 5548 p->arg.lock_owner.s_dev = server->s_dev; 5549 p->res.lock_seqid = p->arg.lock_seqid; 5550 p->lsp = lsp; 5551 p->server = server; 5552 atomic_inc(&lsp->ls_count); 5553 p->ctx = get_nfs_open_context(ctx); 5554 memcpy(&p->fl, fl, sizeof(p->fl)); 5555 return p; 5556 out_free_seqid: 5557 nfs_free_seqid(p->arg.open_seqid); 5558 out_free: 5559 kfree(p); 5560 return NULL; 5561 } 5562 5563 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 5564 { 5565 struct nfs4_lockdata *data = calldata; 5566 struct nfs4_state *state = data->lsp->ls_state; 5567 5568 dprintk("%s: begin!\n", __func__); 5569 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 5570 goto out_wait; 5571 /* Do we need to do an open_to_lock_owner? */ 5572 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 5573 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 5574 goto out_release_lock_seqid; 5575 } 5576 data->arg.open_stateid = &state->open_stateid; 5577 data->arg.new_lock_owner = 1; 5578 data->res.open_seqid = data->arg.open_seqid; 5579 } else 5580 data->arg.new_lock_owner = 0; 5581 if (!nfs4_valid_open_stateid(state)) { 5582 data->rpc_status = -EBADF; 5583 task->tk_action = NULL; 5584 goto out_release_open_seqid; 5585 } 5586 data->timestamp = jiffies; 5587 if (nfs4_setup_sequence(data->server, 5588 &data->arg.seq_args, 5589 &data->res.seq_res, 5590 task) == 0) 5591 return; 5592 out_release_open_seqid: 5593 nfs_release_seqid(data->arg.open_seqid); 5594 out_release_lock_seqid: 5595 nfs_release_seqid(data->arg.lock_seqid); 5596 out_wait: 5597 nfs4_sequence_done(task, &data->res.seq_res); 5598 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 5599 } 5600 5601 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 5602 { 5603 struct nfs4_lockdata *data = calldata; 5604 5605 dprintk("%s: begin!\n", __func__); 5606 5607 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5608 return; 5609 5610 data->rpc_status = task->tk_status; 5611 if (data->arg.new_lock_owner != 0) { 5612 if (data->rpc_status == 0) 5613 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 5614 else 5615 goto out; 5616 } 5617 if (data->rpc_status == 0) { 5618 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid); 5619 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags); 5620 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); 5621 } 5622 out: 5623 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 5624 } 5625 5626 static void nfs4_lock_release(void *calldata) 5627 { 5628 struct nfs4_lockdata *data = calldata; 5629 5630 dprintk("%s: begin!\n", __func__); 5631 nfs_free_seqid(data->arg.open_seqid); 5632 if (data->cancelled != 0) { 5633 struct rpc_task *task; 5634 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 5635 data->arg.lock_seqid); 5636 if (!IS_ERR(task)) 5637 rpc_put_task_async(task); 5638 dprintk("%s: cancelling lock!\n", __func__); 5639 } else 5640 nfs_free_seqid(data->arg.lock_seqid); 5641 nfs4_put_lock_state(data->lsp); 5642 put_nfs_open_context(data->ctx); 5643 kfree(data); 5644 dprintk("%s: done!\n", __func__); 5645 } 5646 5647 static const struct rpc_call_ops nfs4_lock_ops = { 5648 .rpc_call_prepare = nfs4_lock_prepare, 5649 .rpc_call_done = nfs4_lock_done, 5650 .rpc_release = nfs4_lock_release, 5651 }; 5652 5653 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 5654 { 5655 switch (error) { 5656 case -NFS4ERR_ADMIN_REVOKED: 5657 case -NFS4ERR_BAD_STATEID: 5658 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5659 if (new_lock_owner != 0 || 5660 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 5661 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 5662 break; 5663 case -NFS4ERR_STALE_STATEID: 5664 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5665 case -NFS4ERR_EXPIRED: 5666 nfs4_schedule_lease_recovery(server->nfs_client); 5667 }; 5668 } 5669 5670 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 5671 { 5672 struct nfs4_lockdata *data; 5673 struct rpc_task *task; 5674 struct rpc_message msg = { 5675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 5676 .rpc_cred = state->owner->so_cred, 5677 }; 5678 struct rpc_task_setup task_setup_data = { 5679 .rpc_client = NFS_CLIENT(state->inode), 5680 .rpc_message = &msg, 5681 .callback_ops = &nfs4_lock_ops, 5682 .workqueue = nfsiod_workqueue, 5683 .flags = RPC_TASK_ASYNC, 5684 }; 5685 int ret; 5686 5687 dprintk("%s: begin!\n", __func__); 5688 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 5689 fl->fl_u.nfs4_fl.owner, 5690 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 5691 if (data == NULL) 5692 return -ENOMEM; 5693 if (IS_SETLKW(cmd)) 5694 data->arg.block = 1; 5695 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5696 msg.rpc_argp = &data->arg; 5697 msg.rpc_resp = &data->res; 5698 task_setup_data.callback_data = data; 5699 if (recovery_type > NFS_LOCK_NEW) { 5700 if (recovery_type == NFS_LOCK_RECLAIM) 5701 data->arg.reclaim = NFS_LOCK_RECLAIM; 5702 nfs4_set_sequence_privileged(&data->arg.seq_args); 5703 } 5704 task = rpc_run_task(&task_setup_data); 5705 if (IS_ERR(task)) 5706 return PTR_ERR(task); 5707 ret = nfs4_wait_for_completion_rpc_task(task); 5708 if (ret == 0) { 5709 ret = data->rpc_status; 5710 if (ret) 5711 nfs4_handle_setlk_error(data->server, data->lsp, 5712 data->arg.new_lock_owner, ret); 5713 } else 5714 data->cancelled = 1; 5715 rpc_put_task(task); 5716 dprintk("%s: done, ret = %d!\n", __func__, ret); 5717 return ret; 5718 } 5719 5720 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 5721 { 5722 struct nfs_server *server = NFS_SERVER(state->inode); 5723 struct nfs4_exception exception = { 5724 .inode = state->inode, 5725 }; 5726 int err; 5727 5728 do { 5729 /* Cache the lock if possible... */ 5730 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5731 return 0; 5732 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 5733 trace_nfs4_lock_reclaim(request, state, F_SETLK, err); 5734 if (err != -NFS4ERR_DELAY) 5735 break; 5736 nfs4_handle_exception(server, err, &exception); 5737 } while (exception.retry); 5738 return err; 5739 } 5740 5741 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 5742 { 5743 struct nfs_server *server = NFS_SERVER(state->inode); 5744 struct nfs4_exception exception = { 5745 .inode = state->inode, 5746 }; 5747 int err; 5748 5749 err = nfs4_set_lock_state(state, request); 5750 if (err != 0) 5751 return err; 5752 if (!recover_lost_locks) { 5753 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 5754 return 0; 5755 } 5756 do { 5757 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5758 return 0; 5759 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 5760 trace_nfs4_lock_expired(request, state, F_SETLK, err); 5761 switch (err) { 5762 default: 5763 goto out; 5764 case -NFS4ERR_GRACE: 5765 case -NFS4ERR_DELAY: 5766 nfs4_handle_exception(server, err, &exception); 5767 err = 0; 5768 } 5769 } while (exception.retry); 5770 out: 5771 return err; 5772 } 5773 5774 #if defined(CONFIG_NFS_V4_1) 5775 /** 5776 * nfs41_check_expired_locks - possibly free a lock stateid 5777 * 5778 * @state: NFSv4 state for an inode 5779 * 5780 * Returns NFS_OK if recovery for this stateid is now finished. 5781 * Otherwise a negative NFS4ERR value is returned. 5782 */ 5783 static int nfs41_check_expired_locks(struct nfs4_state *state) 5784 { 5785 int status, ret = -NFS4ERR_BAD_STATEID; 5786 struct nfs4_lock_state *lsp; 5787 struct nfs_server *server = NFS_SERVER(state->inode); 5788 5789 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 5790 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 5791 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 5792 5793 status = nfs41_test_stateid(server, 5794 &lsp->ls_stateid, 5795 cred); 5796 trace_nfs4_test_lock_stateid(state, lsp, status); 5797 if (status != NFS_OK) { 5798 /* Free the stateid unless the server 5799 * informs us the stateid is unrecognized. */ 5800 if (status != -NFS4ERR_BAD_STATEID) 5801 nfs41_free_stateid(server, 5802 &lsp->ls_stateid, 5803 cred); 5804 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 5805 ret = status; 5806 } 5807 } 5808 }; 5809 5810 return ret; 5811 } 5812 5813 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 5814 { 5815 int status = NFS_OK; 5816 5817 if (test_bit(LK_STATE_IN_USE, &state->flags)) 5818 status = nfs41_check_expired_locks(state); 5819 if (status != NFS_OK) 5820 status = nfs4_lock_expired(state, request); 5821 return status; 5822 } 5823 #endif 5824 5825 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5826 { 5827 struct nfs4_state_owner *sp = state->owner; 5828 struct nfs_inode *nfsi = NFS_I(state->inode); 5829 unsigned char fl_flags = request->fl_flags; 5830 unsigned int seq; 5831 int status = -ENOLCK; 5832 5833 if ((fl_flags & FL_POSIX) && 5834 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 5835 goto out; 5836 /* Is this a delegated open? */ 5837 status = nfs4_set_lock_state(state, request); 5838 if (status != 0) 5839 goto out; 5840 request->fl_flags |= FL_ACCESS; 5841 status = do_vfs_lock(request->fl_file, request); 5842 if (status < 0) 5843 goto out; 5844 down_read(&nfsi->rwsem); 5845 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 5846 /* Yes: cache locks! */ 5847 /* ...but avoid races with delegation recall... */ 5848 request->fl_flags = fl_flags & ~FL_SLEEP; 5849 status = do_vfs_lock(request->fl_file, request); 5850 goto out_unlock; 5851 } 5852 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 5853 up_read(&nfsi->rwsem); 5854 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 5855 if (status != 0) 5856 goto out; 5857 down_read(&nfsi->rwsem); 5858 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) { 5859 status = -NFS4ERR_DELAY; 5860 goto out_unlock; 5861 } 5862 /* Note: we always want to sleep here! */ 5863 request->fl_flags = fl_flags | FL_SLEEP; 5864 if (do_vfs_lock(request->fl_file, request) < 0) 5865 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock " 5866 "manager!\n", __func__); 5867 out_unlock: 5868 up_read(&nfsi->rwsem); 5869 out: 5870 request->fl_flags = fl_flags; 5871 return status; 5872 } 5873 5874 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5875 { 5876 struct nfs4_exception exception = { 5877 .state = state, 5878 .inode = state->inode, 5879 }; 5880 int err; 5881 5882 do { 5883 err = _nfs4_proc_setlk(state, cmd, request); 5884 trace_nfs4_set_lock(request, state, cmd, err); 5885 if (err == -NFS4ERR_DENIED) 5886 err = -EAGAIN; 5887 err = nfs4_handle_exception(NFS_SERVER(state->inode), 5888 err, &exception); 5889 } while (exception.retry); 5890 return err; 5891 } 5892 5893 static int 5894 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 5895 { 5896 struct nfs_open_context *ctx; 5897 struct nfs4_state *state; 5898 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 5899 int status; 5900 5901 /* verify open state */ 5902 ctx = nfs_file_open_context(filp); 5903 state = ctx->state; 5904 5905 if (request->fl_start < 0 || request->fl_end < 0) 5906 return -EINVAL; 5907 5908 if (IS_GETLK(cmd)) { 5909 if (state != NULL) 5910 return nfs4_proc_getlk(state, F_GETLK, request); 5911 return 0; 5912 } 5913 5914 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 5915 return -EINVAL; 5916 5917 if (request->fl_type == F_UNLCK) { 5918 if (state != NULL) 5919 return nfs4_proc_unlck(state, cmd, request); 5920 return 0; 5921 } 5922 5923 if (state == NULL) 5924 return -ENOLCK; 5925 /* 5926 * Don't rely on the VFS having checked the file open mode, 5927 * since it won't do this for flock() locks. 5928 */ 5929 switch (request->fl_type) { 5930 case F_RDLCK: 5931 if (!(filp->f_mode & FMODE_READ)) 5932 return -EBADF; 5933 break; 5934 case F_WRLCK: 5935 if (!(filp->f_mode & FMODE_WRITE)) 5936 return -EBADF; 5937 } 5938 5939 do { 5940 status = nfs4_proc_setlk(state, cmd, request); 5941 if ((status != -EAGAIN) || IS_SETLK(cmd)) 5942 break; 5943 timeout = nfs4_set_lock_task_retry(timeout); 5944 status = -ERESTARTSYS; 5945 if (signalled()) 5946 break; 5947 } while(status < 0); 5948 return status; 5949 } 5950 5951 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 5952 { 5953 struct nfs_server *server = NFS_SERVER(state->inode); 5954 int err; 5955 5956 err = nfs4_set_lock_state(state, fl); 5957 if (err != 0) 5958 return err; 5959 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 5960 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 5961 } 5962 5963 struct nfs_release_lockowner_data { 5964 struct nfs4_lock_state *lsp; 5965 struct nfs_server *server; 5966 struct nfs_release_lockowner_args args; 5967 struct nfs_release_lockowner_res res; 5968 unsigned long timestamp; 5969 }; 5970 5971 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 5972 { 5973 struct nfs_release_lockowner_data *data = calldata; 5974 struct nfs_server *server = data->server; 5975 nfs40_setup_sequence(server, &data->args.seq_args, 5976 &data->res.seq_res, task); 5977 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 5978 data->timestamp = jiffies; 5979 } 5980 5981 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 5982 { 5983 struct nfs_release_lockowner_data *data = calldata; 5984 struct nfs_server *server = data->server; 5985 5986 nfs40_sequence_done(task, &data->res.seq_res); 5987 5988 switch (task->tk_status) { 5989 case 0: 5990 renew_lease(server, data->timestamp); 5991 break; 5992 case -NFS4ERR_STALE_CLIENTID: 5993 case -NFS4ERR_EXPIRED: 5994 nfs4_schedule_lease_recovery(server->nfs_client); 5995 break; 5996 case -NFS4ERR_LEASE_MOVED: 5997 case -NFS4ERR_DELAY: 5998 if (nfs4_async_handle_error(task, server, 5999 NULL, NULL) == -EAGAIN) 6000 rpc_restart_call_prepare(task); 6001 } 6002 } 6003 6004 static void nfs4_release_lockowner_release(void *calldata) 6005 { 6006 struct nfs_release_lockowner_data *data = calldata; 6007 nfs4_free_lock_state(data->server, data->lsp); 6008 kfree(calldata); 6009 } 6010 6011 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 6012 .rpc_call_prepare = nfs4_release_lockowner_prepare, 6013 .rpc_call_done = nfs4_release_lockowner_done, 6014 .rpc_release = nfs4_release_lockowner_release, 6015 }; 6016 6017 static void 6018 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 6019 { 6020 struct nfs_release_lockowner_data *data; 6021 struct rpc_message msg = { 6022 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 6023 }; 6024 6025 if (server->nfs_client->cl_mvops->minor_version != 0) 6026 return; 6027 6028 data = kmalloc(sizeof(*data), GFP_NOFS); 6029 if (!data) 6030 return; 6031 data->lsp = lsp; 6032 data->server = server; 6033 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6034 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6035 data->args.lock_owner.s_dev = server->s_dev; 6036 6037 msg.rpc_argp = &data->args; 6038 msg.rpc_resp = &data->res; 6039 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 6040 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6041 } 6042 6043 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6044 6045 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key, 6046 const void *buf, size_t buflen, 6047 int flags, int type) 6048 { 6049 if (strcmp(key, "") != 0) 6050 return -EINVAL; 6051 6052 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen); 6053 } 6054 6055 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key, 6056 void *buf, size_t buflen, int type) 6057 { 6058 if (strcmp(key, "") != 0) 6059 return -EINVAL; 6060 6061 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen); 6062 } 6063 6064 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list, 6065 size_t list_len, const char *name, 6066 size_t name_len, int type) 6067 { 6068 size_t len = sizeof(XATTR_NAME_NFSV4_ACL); 6069 6070 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 6071 return 0; 6072 6073 if (list && len <= list_len) 6074 memcpy(list, XATTR_NAME_NFSV4_ACL, len); 6075 return len; 6076 } 6077 6078 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6079 static inline int nfs4_server_supports_labels(struct nfs_server *server) 6080 { 6081 return server->caps & NFS_CAP_SECURITY_LABEL; 6082 } 6083 6084 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key, 6085 const void *buf, size_t buflen, 6086 int flags, int type) 6087 { 6088 if (security_ismaclabel(key)) 6089 return nfs4_set_security_label(dentry, buf, buflen); 6090 6091 return -EOPNOTSUPP; 6092 } 6093 6094 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key, 6095 void *buf, size_t buflen, int type) 6096 { 6097 if (security_ismaclabel(key)) 6098 return nfs4_get_security_label(dentry->d_inode, buf, buflen); 6099 return -EOPNOTSUPP; 6100 } 6101 6102 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list, 6103 size_t list_len, const char *name, 6104 size_t name_len, int type) 6105 { 6106 size_t len = 0; 6107 6108 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) { 6109 len = security_inode_listsecurity(dentry->d_inode, NULL, 0); 6110 if (list && len <= list_len) 6111 security_inode_listsecurity(dentry->d_inode, list, len); 6112 } 6113 return len; 6114 } 6115 6116 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6117 .prefix = XATTR_SECURITY_PREFIX, 6118 .list = nfs4_xattr_list_nfs4_label, 6119 .get = nfs4_xattr_get_nfs4_label, 6120 .set = nfs4_xattr_set_nfs4_label, 6121 }; 6122 #endif 6123 6124 6125 /* 6126 * nfs_fhget will use either the mounted_on_fileid or the fileid 6127 */ 6128 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6129 { 6130 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6131 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6132 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6133 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6134 return; 6135 6136 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6137 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6138 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6139 fattr->nlink = 2; 6140 } 6141 6142 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6143 const struct qstr *name, 6144 struct nfs4_fs_locations *fs_locations, 6145 struct page *page) 6146 { 6147 struct nfs_server *server = NFS_SERVER(dir); 6148 u32 bitmask[3] = { 6149 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6150 }; 6151 struct nfs4_fs_locations_arg args = { 6152 .dir_fh = NFS_FH(dir), 6153 .name = name, 6154 .page = page, 6155 .bitmask = bitmask, 6156 }; 6157 struct nfs4_fs_locations_res res = { 6158 .fs_locations = fs_locations, 6159 }; 6160 struct rpc_message msg = { 6161 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6162 .rpc_argp = &args, 6163 .rpc_resp = &res, 6164 }; 6165 int status; 6166 6167 dprintk("%s: start\n", __func__); 6168 6169 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6170 * is not supported */ 6171 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6172 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 6173 else 6174 bitmask[0] |= FATTR4_WORD0_FILEID; 6175 6176 nfs_fattr_init(&fs_locations->fattr); 6177 fs_locations->server = server; 6178 fs_locations->nlocations = 0; 6179 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6180 dprintk("%s: returned status = %d\n", __func__, status); 6181 return status; 6182 } 6183 6184 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6185 const struct qstr *name, 6186 struct nfs4_fs_locations *fs_locations, 6187 struct page *page) 6188 { 6189 struct nfs4_exception exception = { }; 6190 int err; 6191 do { 6192 err = _nfs4_proc_fs_locations(client, dir, name, 6193 fs_locations, page); 6194 trace_nfs4_get_fs_locations(dir, name, err); 6195 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6196 &exception); 6197 } while (exception.retry); 6198 return err; 6199 } 6200 6201 /* 6202 * This operation also signals the server that this client is 6203 * performing migration recovery. The server can stop returning 6204 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 6205 * appended to this compound to identify the client ID which is 6206 * performing recovery. 6207 */ 6208 static int _nfs40_proc_get_locations(struct inode *inode, 6209 struct nfs4_fs_locations *locations, 6210 struct page *page, struct rpc_cred *cred) 6211 { 6212 struct nfs_server *server = NFS_SERVER(inode); 6213 struct rpc_clnt *clnt = server->client; 6214 u32 bitmask[2] = { 6215 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6216 }; 6217 struct nfs4_fs_locations_arg args = { 6218 .clientid = server->nfs_client->cl_clientid, 6219 .fh = NFS_FH(inode), 6220 .page = page, 6221 .bitmask = bitmask, 6222 .migration = 1, /* skip LOOKUP */ 6223 .renew = 1, /* append RENEW */ 6224 }; 6225 struct nfs4_fs_locations_res res = { 6226 .fs_locations = locations, 6227 .migration = 1, 6228 .renew = 1, 6229 }; 6230 struct rpc_message msg = { 6231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6232 .rpc_argp = &args, 6233 .rpc_resp = &res, 6234 .rpc_cred = cred, 6235 }; 6236 unsigned long now = jiffies; 6237 int status; 6238 6239 nfs_fattr_init(&locations->fattr); 6240 locations->server = server; 6241 locations->nlocations = 0; 6242 6243 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6244 nfs4_set_sequence_privileged(&args.seq_args); 6245 status = nfs4_call_sync_sequence(clnt, server, &msg, 6246 &args.seq_args, &res.seq_res); 6247 if (status) 6248 return status; 6249 6250 renew_lease(server, now); 6251 return 0; 6252 } 6253 6254 #ifdef CONFIG_NFS_V4_1 6255 6256 /* 6257 * This operation also signals the server that this client is 6258 * performing migration recovery. The server can stop asserting 6259 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 6260 * performing this operation is identified in the SEQUENCE 6261 * operation in this compound. 6262 * 6263 * When the client supports GETATTR(fs_locations_info), it can 6264 * be plumbed in here. 6265 */ 6266 static int _nfs41_proc_get_locations(struct inode *inode, 6267 struct nfs4_fs_locations *locations, 6268 struct page *page, struct rpc_cred *cred) 6269 { 6270 struct nfs_server *server = NFS_SERVER(inode); 6271 struct rpc_clnt *clnt = server->client; 6272 u32 bitmask[2] = { 6273 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6274 }; 6275 struct nfs4_fs_locations_arg args = { 6276 .fh = NFS_FH(inode), 6277 .page = page, 6278 .bitmask = bitmask, 6279 .migration = 1, /* skip LOOKUP */ 6280 }; 6281 struct nfs4_fs_locations_res res = { 6282 .fs_locations = locations, 6283 .migration = 1, 6284 }; 6285 struct rpc_message msg = { 6286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6287 .rpc_argp = &args, 6288 .rpc_resp = &res, 6289 .rpc_cred = cred, 6290 }; 6291 int status; 6292 6293 nfs_fattr_init(&locations->fattr); 6294 locations->server = server; 6295 locations->nlocations = 0; 6296 6297 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6298 nfs4_set_sequence_privileged(&args.seq_args); 6299 status = nfs4_call_sync_sequence(clnt, server, &msg, 6300 &args.seq_args, &res.seq_res); 6301 if (status == NFS4_OK && 6302 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6303 status = -NFS4ERR_LEASE_MOVED; 6304 return status; 6305 } 6306 6307 #endif /* CONFIG_NFS_V4_1 */ 6308 6309 /** 6310 * nfs4_proc_get_locations - discover locations for a migrated FSID 6311 * @inode: inode on FSID that is migrating 6312 * @locations: result of query 6313 * @page: buffer 6314 * @cred: credential to use for this operation 6315 * 6316 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 6317 * operation failed, or a negative errno if a local error occurred. 6318 * 6319 * On success, "locations" is filled in, but if the server has 6320 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 6321 * asserted. 6322 * 6323 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 6324 * from this client that require migration recovery. 6325 */ 6326 int nfs4_proc_get_locations(struct inode *inode, 6327 struct nfs4_fs_locations *locations, 6328 struct page *page, struct rpc_cred *cred) 6329 { 6330 struct nfs_server *server = NFS_SERVER(inode); 6331 struct nfs_client *clp = server->nfs_client; 6332 const struct nfs4_mig_recovery_ops *ops = 6333 clp->cl_mvops->mig_recovery_ops; 6334 struct nfs4_exception exception = { }; 6335 int status; 6336 6337 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6338 (unsigned long long)server->fsid.major, 6339 (unsigned long long)server->fsid.minor, 6340 clp->cl_hostname); 6341 nfs_display_fhandle(NFS_FH(inode), __func__); 6342 6343 do { 6344 status = ops->get_locations(inode, locations, page, cred); 6345 if (status != -NFS4ERR_DELAY) 6346 break; 6347 nfs4_handle_exception(server, status, &exception); 6348 } while (exception.retry); 6349 return status; 6350 } 6351 6352 /* 6353 * This operation also signals the server that this client is 6354 * performing "lease moved" recovery. The server can stop 6355 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 6356 * is appended to this compound to identify the client ID which is 6357 * performing recovery. 6358 */ 6359 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6360 { 6361 struct nfs_server *server = NFS_SERVER(inode); 6362 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 6363 struct rpc_clnt *clnt = server->client; 6364 struct nfs4_fsid_present_arg args = { 6365 .fh = NFS_FH(inode), 6366 .clientid = clp->cl_clientid, 6367 .renew = 1, /* append RENEW */ 6368 }; 6369 struct nfs4_fsid_present_res res = { 6370 .renew = 1, 6371 }; 6372 struct rpc_message msg = { 6373 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6374 .rpc_argp = &args, 6375 .rpc_resp = &res, 6376 .rpc_cred = cred, 6377 }; 6378 unsigned long now = jiffies; 6379 int status; 6380 6381 res.fh = nfs_alloc_fhandle(); 6382 if (res.fh == NULL) 6383 return -ENOMEM; 6384 6385 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6386 nfs4_set_sequence_privileged(&args.seq_args); 6387 status = nfs4_call_sync_sequence(clnt, server, &msg, 6388 &args.seq_args, &res.seq_res); 6389 nfs_free_fhandle(res.fh); 6390 if (status) 6391 return status; 6392 6393 do_renew_lease(clp, now); 6394 return 0; 6395 } 6396 6397 #ifdef CONFIG_NFS_V4_1 6398 6399 /* 6400 * This operation also signals the server that this client is 6401 * performing "lease moved" recovery. The server can stop asserting 6402 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 6403 * this operation is identified in the SEQUENCE operation in this 6404 * compound. 6405 */ 6406 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6407 { 6408 struct nfs_server *server = NFS_SERVER(inode); 6409 struct rpc_clnt *clnt = server->client; 6410 struct nfs4_fsid_present_arg args = { 6411 .fh = NFS_FH(inode), 6412 }; 6413 struct nfs4_fsid_present_res res = { 6414 }; 6415 struct rpc_message msg = { 6416 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6417 .rpc_argp = &args, 6418 .rpc_resp = &res, 6419 .rpc_cred = cred, 6420 }; 6421 int status; 6422 6423 res.fh = nfs_alloc_fhandle(); 6424 if (res.fh == NULL) 6425 return -ENOMEM; 6426 6427 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6428 nfs4_set_sequence_privileged(&args.seq_args); 6429 status = nfs4_call_sync_sequence(clnt, server, &msg, 6430 &args.seq_args, &res.seq_res); 6431 nfs_free_fhandle(res.fh); 6432 if (status == NFS4_OK && 6433 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6434 status = -NFS4ERR_LEASE_MOVED; 6435 return status; 6436 } 6437 6438 #endif /* CONFIG_NFS_V4_1 */ 6439 6440 /** 6441 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 6442 * @inode: inode on FSID to check 6443 * @cred: credential to use for this operation 6444 * 6445 * Server indicates whether the FSID is present, moved, or not 6446 * recognized. This operation is necessary to clear a LEASE_MOVED 6447 * condition for this client ID. 6448 * 6449 * Returns NFS4_OK if the FSID is present on this server, 6450 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 6451 * NFS4ERR code if some error occurred on the server, or a 6452 * negative errno if a local failure occurred. 6453 */ 6454 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6455 { 6456 struct nfs_server *server = NFS_SERVER(inode); 6457 struct nfs_client *clp = server->nfs_client; 6458 const struct nfs4_mig_recovery_ops *ops = 6459 clp->cl_mvops->mig_recovery_ops; 6460 struct nfs4_exception exception = { }; 6461 int status; 6462 6463 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6464 (unsigned long long)server->fsid.major, 6465 (unsigned long long)server->fsid.minor, 6466 clp->cl_hostname); 6467 nfs_display_fhandle(NFS_FH(inode), __func__); 6468 6469 do { 6470 status = ops->fsid_present(inode, cred); 6471 if (status != -NFS4ERR_DELAY) 6472 break; 6473 nfs4_handle_exception(server, status, &exception); 6474 } while (exception.retry); 6475 return status; 6476 } 6477 6478 /** 6479 * If 'use_integrity' is true and the state managment nfs_client 6480 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 6481 * and the machine credential as per RFC3530bis and RFC5661 Security 6482 * Considerations sections. Otherwise, just use the user cred with the 6483 * filesystem's rpc_client. 6484 */ 6485 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 6486 { 6487 int status; 6488 struct nfs4_secinfo_arg args = { 6489 .dir_fh = NFS_FH(dir), 6490 .name = name, 6491 }; 6492 struct nfs4_secinfo_res res = { 6493 .flavors = flavors, 6494 }; 6495 struct rpc_message msg = { 6496 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 6497 .rpc_argp = &args, 6498 .rpc_resp = &res, 6499 }; 6500 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 6501 struct rpc_cred *cred = NULL; 6502 6503 if (use_integrity) { 6504 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 6505 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 6506 msg.rpc_cred = cred; 6507 } 6508 6509 dprintk("NFS call secinfo %s\n", name->name); 6510 6511 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 6512 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 6513 6514 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 6515 &res.seq_res, 0); 6516 dprintk("NFS reply secinfo: %d\n", status); 6517 6518 if (cred) 6519 put_rpccred(cred); 6520 6521 return status; 6522 } 6523 6524 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 6525 struct nfs4_secinfo_flavors *flavors) 6526 { 6527 struct nfs4_exception exception = { }; 6528 int err; 6529 do { 6530 err = -NFS4ERR_WRONGSEC; 6531 6532 /* try to use integrity protection with machine cred */ 6533 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 6534 err = _nfs4_proc_secinfo(dir, name, flavors, true); 6535 6536 /* 6537 * if unable to use integrity protection, or SECINFO with 6538 * integrity protection returns NFS4ERR_WRONGSEC (which is 6539 * disallowed by spec, but exists in deployed servers) use 6540 * the current filesystem's rpc_client and the user cred. 6541 */ 6542 if (err == -NFS4ERR_WRONGSEC) 6543 err = _nfs4_proc_secinfo(dir, name, flavors, false); 6544 6545 trace_nfs4_secinfo(dir, name, err); 6546 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6547 &exception); 6548 } while (exception.retry); 6549 return err; 6550 } 6551 6552 #ifdef CONFIG_NFS_V4_1 6553 /* 6554 * Check the exchange flags returned by the server for invalid flags, having 6555 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 6556 * DS flags set. 6557 */ 6558 static int nfs4_check_cl_exchange_flags(u32 flags) 6559 { 6560 if (flags & ~EXCHGID4_FLAG_MASK_R) 6561 goto out_inval; 6562 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 6563 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 6564 goto out_inval; 6565 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 6566 goto out_inval; 6567 return NFS_OK; 6568 out_inval: 6569 return -NFS4ERR_INVAL; 6570 } 6571 6572 static bool 6573 nfs41_same_server_scope(struct nfs41_server_scope *a, 6574 struct nfs41_server_scope *b) 6575 { 6576 if (a->server_scope_sz == b->server_scope_sz && 6577 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 6578 return true; 6579 6580 return false; 6581 } 6582 6583 /* 6584 * nfs4_proc_bind_conn_to_session() 6585 * 6586 * The 4.1 client currently uses the same TCP connection for the 6587 * fore and backchannel. 6588 */ 6589 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 6590 { 6591 int status; 6592 struct nfs41_bind_conn_to_session_res res; 6593 struct rpc_message msg = { 6594 .rpc_proc = 6595 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 6596 .rpc_argp = clp, 6597 .rpc_resp = &res, 6598 .rpc_cred = cred, 6599 }; 6600 6601 dprintk("--> %s\n", __func__); 6602 6603 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS); 6604 if (unlikely(res.session == NULL)) { 6605 status = -ENOMEM; 6606 goto out; 6607 } 6608 6609 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6610 trace_nfs4_bind_conn_to_session(clp, status); 6611 if (status == 0) { 6612 if (memcmp(res.session->sess_id.data, 6613 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 6614 dprintk("NFS: %s: Session ID mismatch\n", __func__); 6615 status = -EIO; 6616 goto out_session; 6617 } 6618 if (res.dir != NFS4_CDFS4_BOTH) { 6619 dprintk("NFS: %s: Unexpected direction from server\n", 6620 __func__); 6621 status = -EIO; 6622 goto out_session; 6623 } 6624 if (res.use_conn_in_rdma_mode) { 6625 dprintk("NFS: %s: Server returned RDMA mode = true\n", 6626 __func__); 6627 status = -EIO; 6628 goto out_session; 6629 } 6630 } 6631 out_session: 6632 kfree(res.session); 6633 out: 6634 dprintk("<-- %s status= %d\n", __func__, status); 6635 return status; 6636 } 6637 6638 /* 6639 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 6640 * and operations we'd like to see to enable certain features in the allow map 6641 */ 6642 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 6643 .how = SP4_MACH_CRED, 6644 .enforce.u.words = { 6645 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6646 1 << (OP_EXCHANGE_ID - 32) | 6647 1 << (OP_CREATE_SESSION - 32) | 6648 1 << (OP_DESTROY_SESSION - 32) | 6649 1 << (OP_DESTROY_CLIENTID - 32) 6650 }, 6651 .allow.u.words = { 6652 [0] = 1 << (OP_CLOSE) | 6653 1 << (OP_LOCKU) | 6654 1 << (OP_COMMIT), 6655 [1] = 1 << (OP_SECINFO - 32) | 6656 1 << (OP_SECINFO_NO_NAME - 32) | 6657 1 << (OP_TEST_STATEID - 32) | 6658 1 << (OP_FREE_STATEID - 32) | 6659 1 << (OP_WRITE - 32) 6660 } 6661 }; 6662 6663 /* 6664 * Select the state protection mode for client `clp' given the server results 6665 * from exchange_id in `sp'. 6666 * 6667 * Returns 0 on success, negative errno otherwise. 6668 */ 6669 static int nfs4_sp4_select_mode(struct nfs_client *clp, 6670 struct nfs41_state_protection *sp) 6671 { 6672 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 6673 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6674 1 << (OP_EXCHANGE_ID - 32) | 6675 1 << (OP_CREATE_SESSION - 32) | 6676 1 << (OP_DESTROY_SESSION - 32) | 6677 1 << (OP_DESTROY_CLIENTID - 32) 6678 }; 6679 unsigned int i; 6680 6681 if (sp->how == SP4_MACH_CRED) { 6682 /* Print state protect result */ 6683 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 6684 for (i = 0; i <= LAST_NFS4_OP; i++) { 6685 if (test_bit(i, sp->enforce.u.longs)) 6686 dfprintk(MOUNT, " enforce op %d\n", i); 6687 if (test_bit(i, sp->allow.u.longs)) 6688 dfprintk(MOUNT, " allow op %d\n", i); 6689 } 6690 6691 /* make sure nothing is on enforce list that isn't supported */ 6692 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 6693 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 6694 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6695 return -EINVAL; 6696 } 6697 } 6698 6699 /* 6700 * Minimal mode - state operations are allowed to use machine 6701 * credential. Note this already happens by default, so the 6702 * client doesn't have to do anything more than the negotiation. 6703 * 6704 * NOTE: we don't care if EXCHANGE_ID is in the list - 6705 * we're already using the machine cred for exchange_id 6706 * and will never use a different cred. 6707 */ 6708 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 6709 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 6710 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 6711 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 6712 dfprintk(MOUNT, "sp4_mach_cred:\n"); 6713 dfprintk(MOUNT, " minimal mode enabled\n"); 6714 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags); 6715 } else { 6716 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6717 return -EINVAL; 6718 } 6719 6720 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 6721 test_bit(OP_LOCKU, sp->allow.u.longs)) { 6722 dfprintk(MOUNT, " cleanup mode enabled\n"); 6723 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags); 6724 } 6725 6726 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 6727 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 6728 dfprintk(MOUNT, " secinfo mode enabled\n"); 6729 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags); 6730 } 6731 6732 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 6733 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 6734 dfprintk(MOUNT, " stateid mode enabled\n"); 6735 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags); 6736 } 6737 6738 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 6739 dfprintk(MOUNT, " write mode enabled\n"); 6740 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags); 6741 } 6742 6743 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 6744 dfprintk(MOUNT, " commit mode enabled\n"); 6745 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags); 6746 } 6747 } 6748 6749 return 0; 6750 } 6751 6752 /* 6753 * _nfs4_proc_exchange_id() 6754 * 6755 * Wrapper for EXCHANGE_ID operation. 6756 */ 6757 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 6758 u32 sp4_how) 6759 { 6760 nfs4_verifier verifier; 6761 struct nfs41_exchange_id_args args = { 6762 .verifier = &verifier, 6763 .client = clp, 6764 #ifdef CONFIG_NFS_V4_1_MIGRATION 6765 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6766 EXCHGID4_FLAG_BIND_PRINC_STATEID | 6767 EXCHGID4_FLAG_SUPP_MOVED_MIGR, 6768 #else 6769 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6770 EXCHGID4_FLAG_BIND_PRINC_STATEID, 6771 #endif 6772 }; 6773 struct nfs41_exchange_id_res res = { 6774 0 6775 }; 6776 int status; 6777 struct rpc_message msg = { 6778 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 6779 .rpc_argp = &args, 6780 .rpc_resp = &res, 6781 .rpc_cred = cred, 6782 }; 6783 6784 nfs4_init_boot_verifier(clp, &verifier); 6785 args.id_len = nfs4_init_uniform_client_string(clp, args.id, 6786 sizeof(args.id)); 6787 dprintk("NFS call exchange_id auth=%s, '%.*s'\n", 6788 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6789 args.id_len, args.id); 6790 6791 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 6792 GFP_NOFS); 6793 if (unlikely(res.server_owner == NULL)) { 6794 status = -ENOMEM; 6795 goto out; 6796 } 6797 6798 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 6799 GFP_NOFS); 6800 if (unlikely(res.server_scope == NULL)) { 6801 status = -ENOMEM; 6802 goto out_server_owner; 6803 } 6804 6805 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 6806 if (unlikely(res.impl_id == NULL)) { 6807 status = -ENOMEM; 6808 goto out_server_scope; 6809 } 6810 6811 switch (sp4_how) { 6812 case SP4_NONE: 6813 args.state_protect.how = SP4_NONE; 6814 break; 6815 6816 case SP4_MACH_CRED: 6817 args.state_protect = nfs4_sp4_mach_cred_request; 6818 break; 6819 6820 default: 6821 /* unsupported! */ 6822 WARN_ON_ONCE(1); 6823 status = -EINVAL; 6824 goto out_server_scope; 6825 } 6826 6827 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6828 trace_nfs4_exchange_id(clp, status); 6829 if (status == 0) 6830 status = nfs4_check_cl_exchange_flags(res.flags); 6831 6832 if (status == 0) 6833 status = nfs4_sp4_select_mode(clp, &res.state_protect); 6834 6835 if (status == 0) { 6836 clp->cl_clientid = res.clientid; 6837 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R); 6838 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) 6839 clp->cl_seqid = res.seqid; 6840 6841 kfree(clp->cl_serverowner); 6842 clp->cl_serverowner = res.server_owner; 6843 res.server_owner = NULL; 6844 6845 /* use the most recent implementation id */ 6846 kfree(clp->cl_implid); 6847 clp->cl_implid = res.impl_id; 6848 6849 if (clp->cl_serverscope != NULL && 6850 !nfs41_same_server_scope(clp->cl_serverscope, 6851 res.server_scope)) { 6852 dprintk("%s: server_scope mismatch detected\n", 6853 __func__); 6854 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 6855 kfree(clp->cl_serverscope); 6856 clp->cl_serverscope = NULL; 6857 } 6858 6859 if (clp->cl_serverscope == NULL) { 6860 clp->cl_serverscope = res.server_scope; 6861 goto out; 6862 } 6863 } else 6864 kfree(res.impl_id); 6865 6866 out_server_owner: 6867 kfree(res.server_owner); 6868 out_server_scope: 6869 kfree(res.server_scope); 6870 out: 6871 if (clp->cl_implid != NULL) 6872 dprintk("NFS reply exchange_id: Server Implementation ID: " 6873 "domain: %s, name: %s, date: %llu,%u\n", 6874 clp->cl_implid->domain, clp->cl_implid->name, 6875 clp->cl_implid->date.seconds, 6876 clp->cl_implid->date.nseconds); 6877 dprintk("NFS reply exchange_id: %d\n", status); 6878 return status; 6879 } 6880 6881 /* 6882 * nfs4_proc_exchange_id() 6883 * 6884 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6885 * 6886 * Since the clientid has expired, all compounds using sessions 6887 * associated with the stale clientid will be returning 6888 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 6889 * be in some phase of session reset. 6890 * 6891 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 6892 */ 6893 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 6894 { 6895 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 6896 int status; 6897 6898 /* try SP4_MACH_CRED if krb5i/p */ 6899 if (authflavor == RPC_AUTH_GSS_KRB5I || 6900 authflavor == RPC_AUTH_GSS_KRB5P) { 6901 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 6902 if (!status) 6903 return 0; 6904 } 6905 6906 /* try SP4_NONE */ 6907 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 6908 } 6909 6910 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 6911 struct rpc_cred *cred) 6912 { 6913 struct rpc_message msg = { 6914 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 6915 .rpc_argp = clp, 6916 .rpc_cred = cred, 6917 }; 6918 int status; 6919 6920 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6921 trace_nfs4_destroy_clientid(clp, status); 6922 if (status) 6923 dprintk("NFS: Got error %d from the server %s on " 6924 "DESTROY_CLIENTID.", status, clp->cl_hostname); 6925 return status; 6926 } 6927 6928 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 6929 struct rpc_cred *cred) 6930 { 6931 unsigned int loop; 6932 int ret; 6933 6934 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 6935 ret = _nfs4_proc_destroy_clientid(clp, cred); 6936 switch (ret) { 6937 case -NFS4ERR_DELAY: 6938 case -NFS4ERR_CLIENTID_BUSY: 6939 ssleep(1); 6940 break; 6941 default: 6942 return ret; 6943 } 6944 } 6945 return 0; 6946 } 6947 6948 int nfs4_destroy_clientid(struct nfs_client *clp) 6949 { 6950 struct rpc_cred *cred; 6951 int ret = 0; 6952 6953 if (clp->cl_mvops->minor_version < 1) 6954 goto out; 6955 if (clp->cl_exchange_flags == 0) 6956 goto out; 6957 if (clp->cl_preserve_clid) 6958 goto out; 6959 cred = nfs4_get_clid_cred(clp); 6960 ret = nfs4_proc_destroy_clientid(clp, cred); 6961 if (cred) 6962 put_rpccred(cred); 6963 switch (ret) { 6964 case 0: 6965 case -NFS4ERR_STALE_CLIENTID: 6966 clp->cl_exchange_flags = 0; 6967 } 6968 out: 6969 return ret; 6970 } 6971 6972 struct nfs4_get_lease_time_data { 6973 struct nfs4_get_lease_time_args *args; 6974 struct nfs4_get_lease_time_res *res; 6975 struct nfs_client *clp; 6976 }; 6977 6978 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 6979 void *calldata) 6980 { 6981 struct nfs4_get_lease_time_data *data = 6982 (struct nfs4_get_lease_time_data *)calldata; 6983 6984 dprintk("--> %s\n", __func__); 6985 /* just setup sequence, do not trigger session recovery 6986 since we're invoked within one */ 6987 nfs41_setup_sequence(data->clp->cl_session, 6988 &data->args->la_seq_args, 6989 &data->res->lr_seq_res, 6990 task); 6991 dprintk("<-- %s\n", __func__); 6992 } 6993 6994 /* 6995 * Called from nfs4_state_manager thread for session setup, so don't recover 6996 * from sequence operation or clientid errors. 6997 */ 6998 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 6999 { 7000 struct nfs4_get_lease_time_data *data = 7001 (struct nfs4_get_lease_time_data *)calldata; 7002 7003 dprintk("--> %s\n", __func__); 7004 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 7005 return; 7006 switch (task->tk_status) { 7007 case -NFS4ERR_DELAY: 7008 case -NFS4ERR_GRACE: 7009 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 7010 rpc_delay(task, NFS4_POLL_RETRY_MIN); 7011 task->tk_status = 0; 7012 /* fall through */ 7013 case -NFS4ERR_RETRY_UNCACHED_REP: 7014 rpc_restart_call_prepare(task); 7015 return; 7016 } 7017 dprintk("<-- %s\n", __func__); 7018 } 7019 7020 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 7021 .rpc_call_prepare = nfs4_get_lease_time_prepare, 7022 .rpc_call_done = nfs4_get_lease_time_done, 7023 }; 7024 7025 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 7026 { 7027 struct rpc_task *task; 7028 struct nfs4_get_lease_time_args args; 7029 struct nfs4_get_lease_time_res res = { 7030 .lr_fsinfo = fsinfo, 7031 }; 7032 struct nfs4_get_lease_time_data data = { 7033 .args = &args, 7034 .res = &res, 7035 .clp = clp, 7036 }; 7037 struct rpc_message msg = { 7038 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 7039 .rpc_argp = &args, 7040 .rpc_resp = &res, 7041 }; 7042 struct rpc_task_setup task_setup = { 7043 .rpc_client = clp->cl_rpcclient, 7044 .rpc_message = &msg, 7045 .callback_ops = &nfs4_get_lease_time_ops, 7046 .callback_data = &data, 7047 .flags = RPC_TASK_TIMEOUT, 7048 }; 7049 int status; 7050 7051 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 7052 nfs4_set_sequence_privileged(&args.la_seq_args); 7053 dprintk("--> %s\n", __func__); 7054 task = rpc_run_task(&task_setup); 7055 7056 if (IS_ERR(task)) 7057 status = PTR_ERR(task); 7058 else { 7059 status = task->tk_status; 7060 rpc_put_task(task); 7061 } 7062 dprintk("<-- %s return %d\n", __func__, status); 7063 7064 return status; 7065 } 7066 7067 /* 7068 * Initialize the values to be used by the client in CREATE_SESSION 7069 * If nfs4_init_session set the fore channel request and response sizes, 7070 * use them. 7071 * 7072 * Set the back channel max_resp_sz_cached to zero to force the client to 7073 * always set csa_cachethis to FALSE because the current implementation 7074 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 7075 */ 7076 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 7077 { 7078 unsigned int max_rqst_sz, max_resp_sz; 7079 7080 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 7081 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 7082 7083 /* Fore channel attributes */ 7084 args->fc_attrs.max_rqst_sz = max_rqst_sz; 7085 args->fc_attrs.max_resp_sz = max_resp_sz; 7086 args->fc_attrs.max_ops = NFS4_MAX_OPS; 7087 args->fc_attrs.max_reqs = max_session_slots; 7088 7089 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 7090 "max_ops=%u max_reqs=%u\n", 7091 __func__, 7092 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 7093 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 7094 7095 /* Back channel attributes */ 7096 args->bc_attrs.max_rqst_sz = PAGE_SIZE; 7097 args->bc_attrs.max_resp_sz = PAGE_SIZE; 7098 args->bc_attrs.max_resp_sz_cached = 0; 7099 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 7100 args->bc_attrs.max_reqs = 1; 7101 7102 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 7103 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 7104 __func__, 7105 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 7106 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 7107 args->bc_attrs.max_reqs); 7108 } 7109 7110 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 7111 { 7112 struct nfs4_channel_attrs *sent = &args->fc_attrs; 7113 struct nfs4_channel_attrs *rcvd = &session->fc_attrs; 7114 7115 if (rcvd->max_resp_sz > sent->max_resp_sz) 7116 return -EINVAL; 7117 /* 7118 * Our requested max_ops is the minimum we need; we're not 7119 * prepared to break up compounds into smaller pieces than that. 7120 * So, no point even trying to continue if the server won't 7121 * cooperate: 7122 */ 7123 if (rcvd->max_ops < sent->max_ops) 7124 return -EINVAL; 7125 if (rcvd->max_reqs == 0) 7126 return -EINVAL; 7127 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 7128 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 7129 return 0; 7130 } 7131 7132 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 7133 { 7134 struct nfs4_channel_attrs *sent = &args->bc_attrs; 7135 struct nfs4_channel_attrs *rcvd = &session->bc_attrs; 7136 7137 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 7138 return -EINVAL; 7139 if (rcvd->max_resp_sz < sent->max_resp_sz) 7140 return -EINVAL; 7141 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 7142 return -EINVAL; 7143 /* These would render the backchannel useless: */ 7144 if (rcvd->max_ops != sent->max_ops) 7145 return -EINVAL; 7146 if (rcvd->max_reqs != sent->max_reqs) 7147 return -EINVAL; 7148 return 0; 7149 } 7150 7151 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 7152 struct nfs4_session *session) 7153 { 7154 int ret; 7155 7156 ret = nfs4_verify_fore_channel_attrs(args, session); 7157 if (ret) 7158 return ret; 7159 return nfs4_verify_back_channel_attrs(args, session); 7160 } 7161 7162 static int _nfs4_proc_create_session(struct nfs_client *clp, 7163 struct rpc_cred *cred) 7164 { 7165 struct nfs4_session *session = clp->cl_session; 7166 struct nfs41_create_session_args args = { 7167 .client = clp, 7168 .cb_program = NFS4_CALLBACK, 7169 }; 7170 struct nfs41_create_session_res res = { 7171 .client = clp, 7172 }; 7173 struct rpc_message msg = { 7174 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 7175 .rpc_argp = &args, 7176 .rpc_resp = &res, 7177 .rpc_cred = cred, 7178 }; 7179 int status; 7180 7181 nfs4_init_channel_attrs(&args); 7182 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 7183 7184 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7185 trace_nfs4_create_session(clp, status); 7186 7187 if (!status) { 7188 /* Verify the session's negotiated channel_attrs values */ 7189 status = nfs4_verify_channel_attrs(&args, session); 7190 /* Increment the clientid slot sequence id */ 7191 clp->cl_seqid++; 7192 } 7193 7194 return status; 7195 } 7196 7197 /* 7198 * Issues a CREATE_SESSION operation to the server. 7199 * It is the responsibility of the caller to verify the session is 7200 * expired before calling this routine. 7201 */ 7202 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 7203 { 7204 int status; 7205 unsigned *ptr; 7206 struct nfs4_session *session = clp->cl_session; 7207 7208 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 7209 7210 status = _nfs4_proc_create_session(clp, cred); 7211 if (status) 7212 goto out; 7213 7214 /* Init or reset the session slot tables */ 7215 status = nfs4_setup_session_slot_tables(session); 7216 dprintk("slot table setup returned %d\n", status); 7217 if (status) 7218 goto out; 7219 7220 ptr = (unsigned *)&session->sess_id.data[0]; 7221 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 7222 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 7223 out: 7224 dprintk("<-- %s\n", __func__); 7225 return status; 7226 } 7227 7228 /* 7229 * Issue the over-the-wire RPC DESTROY_SESSION. 7230 * The caller must serialize access to this routine. 7231 */ 7232 int nfs4_proc_destroy_session(struct nfs4_session *session, 7233 struct rpc_cred *cred) 7234 { 7235 struct rpc_message msg = { 7236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 7237 .rpc_argp = session, 7238 .rpc_cred = cred, 7239 }; 7240 int status = 0; 7241 7242 dprintk("--> nfs4_proc_destroy_session\n"); 7243 7244 /* session is still being setup */ 7245 if (session->clp->cl_cons_state != NFS_CS_READY) 7246 return status; 7247 7248 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7249 trace_nfs4_destroy_session(session->clp, status); 7250 7251 if (status) 7252 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 7253 "Session has been destroyed regardless...\n", status); 7254 7255 dprintk("<-- nfs4_proc_destroy_session\n"); 7256 return status; 7257 } 7258 7259 /* 7260 * Renew the cl_session lease. 7261 */ 7262 struct nfs4_sequence_data { 7263 struct nfs_client *clp; 7264 struct nfs4_sequence_args args; 7265 struct nfs4_sequence_res res; 7266 }; 7267 7268 static void nfs41_sequence_release(void *data) 7269 { 7270 struct nfs4_sequence_data *calldata = data; 7271 struct nfs_client *clp = calldata->clp; 7272 7273 if (atomic_read(&clp->cl_count) > 1) 7274 nfs4_schedule_state_renewal(clp); 7275 nfs_put_client(clp); 7276 kfree(calldata); 7277 } 7278 7279 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7280 { 7281 switch(task->tk_status) { 7282 case -NFS4ERR_DELAY: 7283 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7284 return -EAGAIN; 7285 default: 7286 nfs4_schedule_lease_recovery(clp); 7287 } 7288 return 0; 7289 } 7290 7291 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 7292 { 7293 struct nfs4_sequence_data *calldata = data; 7294 struct nfs_client *clp = calldata->clp; 7295 7296 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 7297 return; 7298 7299 trace_nfs4_sequence(clp, task->tk_status); 7300 if (task->tk_status < 0) { 7301 dprintk("%s ERROR %d\n", __func__, task->tk_status); 7302 if (atomic_read(&clp->cl_count) == 1) 7303 goto out; 7304 7305 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 7306 rpc_restart_call_prepare(task); 7307 return; 7308 } 7309 } 7310 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 7311 out: 7312 dprintk("<-- %s\n", __func__); 7313 } 7314 7315 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 7316 { 7317 struct nfs4_sequence_data *calldata = data; 7318 struct nfs_client *clp = calldata->clp; 7319 struct nfs4_sequence_args *args; 7320 struct nfs4_sequence_res *res; 7321 7322 args = task->tk_msg.rpc_argp; 7323 res = task->tk_msg.rpc_resp; 7324 7325 nfs41_setup_sequence(clp->cl_session, args, res, task); 7326 } 7327 7328 static const struct rpc_call_ops nfs41_sequence_ops = { 7329 .rpc_call_done = nfs41_sequence_call_done, 7330 .rpc_call_prepare = nfs41_sequence_prepare, 7331 .rpc_release = nfs41_sequence_release, 7332 }; 7333 7334 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 7335 struct rpc_cred *cred, 7336 bool is_privileged) 7337 { 7338 struct nfs4_sequence_data *calldata; 7339 struct rpc_message msg = { 7340 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 7341 .rpc_cred = cred, 7342 }; 7343 struct rpc_task_setup task_setup_data = { 7344 .rpc_client = clp->cl_rpcclient, 7345 .rpc_message = &msg, 7346 .callback_ops = &nfs41_sequence_ops, 7347 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 7348 }; 7349 7350 if (!atomic_inc_not_zero(&clp->cl_count)) 7351 return ERR_PTR(-EIO); 7352 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7353 if (calldata == NULL) { 7354 nfs_put_client(clp); 7355 return ERR_PTR(-ENOMEM); 7356 } 7357 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 7358 if (is_privileged) 7359 nfs4_set_sequence_privileged(&calldata->args); 7360 msg.rpc_argp = &calldata->args; 7361 msg.rpc_resp = &calldata->res; 7362 calldata->clp = clp; 7363 task_setup_data.callback_data = calldata; 7364 7365 return rpc_run_task(&task_setup_data); 7366 } 7367 7368 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 7369 { 7370 struct rpc_task *task; 7371 int ret = 0; 7372 7373 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 7374 return -EAGAIN; 7375 task = _nfs41_proc_sequence(clp, cred, false); 7376 if (IS_ERR(task)) 7377 ret = PTR_ERR(task); 7378 else 7379 rpc_put_task_async(task); 7380 dprintk("<-- %s status=%d\n", __func__, ret); 7381 return ret; 7382 } 7383 7384 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 7385 { 7386 struct rpc_task *task; 7387 int ret; 7388 7389 task = _nfs41_proc_sequence(clp, cred, true); 7390 if (IS_ERR(task)) { 7391 ret = PTR_ERR(task); 7392 goto out; 7393 } 7394 ret = rpc_wait_for_completion_task(task); 7395 if (!ret) { 7396 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp; 7397 7398 if (task->tk_status == 0) 7399 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 7400 ret = task->tk_status; 7401 } 7402 rpc_put_task(task); 7403 out: 7404 dprintk("<-- %s status=%d\n", __func__, ret); 7405 return ret; 7406 } 7407 7408 struct nfs4_reclaim_complete_data { 7409 struct nfs_client *clp; 7410 struct nfs41_reclaim_complete_args arg; 7411 struct nfs41_reclaim_complete_res res; 7412 }; 7413 7414 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 7415 { 7416 struct nfs4_reclaim_complete_data *calldata = data; 7417 7418 nfs41_setup_sequence(calldata->clp->cl_session, 7419 &calldata->arg.seq_args, 7420 &calldata->res.seq_res, 7421 task); 7422 } 7423 7424 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7425 { 7426 switch(task->tk_status) { 7427 case 0: 7428 case -NFS4ERR_COMPLETE_ALREADY: 7429 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 7430 break; 7431 case -NFS4ERR_DELAY: 7432 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7433 /* fall through */ 7434 case -NFS4ERR_RETRY_UNCACHED_REP: 7435 return -EAGAIN; 7436 default: 7437 nfs4_schedule_lease_recovery(clp); 7438 } 7439 return 0; 7440 } 7441 7442 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 7443 { 7444 struct nfs4_reclaim_complete_data *calldata = data; 7445 struct nfs_client *clp = calldata->clp; 7446 struct nfs4_sequence_res *res = &calldata->res.seq_res; 7447 7448 dprintk("--> %s\n", __func__); 7449 if (!nfs41_sequence_done(task, res)) 7450 return; 7451 7452 trace_nfs4_reclaim_complete(clp, task->tk_status); 7453 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 7454 rpc_restart_call_prepare(task); 7455 return; 7456 } 7457 dprintk("<-- %s\n", __func__); 7458 } 7459 7460 static void nfs4_free_reclaim_complete_data(void *data) 7461 { 7462 struct nfs4_reclaim_complete_data *calldata = data; 7463 7464 kfree(calldata); 7465 } 7466 7467 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 7468 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 7469 .rpc_call_done = nfs4_reclaim_complete_done, 7470 .rpc_release = nfs4_free_reclaim_complete_data, 7471 }; 7472 7473 /* 7474 * Issue a global reclaim complete. 7475 */ 7476 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 7477 struct rpc_cred *cred) 7478 { 7479 struct nfs4_reclaim_complete_data *calldata; 7480 struct rpc_task *task; 7481 struct rpc_message msg = { 7482 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 7483 .rpc_cred = cred, 7484 }; 7485 struct rpc_task_setup task_setup_data = { 7486 .rpc_client = clp->cl_rpcclient, 7487 .rpc_message = &msg, 7488 .callback_ops = &nfs4_reclaim_complete_call_ops, 7489 .flags = RPC_TASK_ASYNC, 7490 }; 7491 int status = -ENOMEM; 7492 7493 dprintk("--> %s\n", __func__); 7494 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7495 if (calldata == NULL) 7496 goto out; 7497 calldata->clp = clp; 7498 calldata->arg.one_fs = 0; 7499 7500 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 7501 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 7502 msg.rpc_argp = &calldata->arg; 7503 msg.rpc_resp = &calldata->res; 7504 task_setup_data.callback_data = calldata; 7505 task = rpc_run_task(&task_setup_data); 7506 if (IS_ERR(task)) { 7507 status = PTR_ERR(task); 7508 goto out; 7509 } 7510 status = nfs4_wait_for_completion_rpc_task(task); 7511 if (status == 0) 7512 status = task->tk_status; 7513 rpc_put_task(task); 7514 return 0; 7515 out: 7516 dprintk("<-- %s status=%d\n", __func__, status); 7517 return status; 7518 } 7519 7520 static void 7521 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 7522 { 7523 struct nfs4_layoutget *lgp = calldata; 7524 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 7525 struct nfs4_session *session = nfs4_get_session(server); 7526 7527 dprintk("--> %s\n", __func__); 7528 /* Note the is a race here, where a CB_LAYOUTRECALL can come in 7529 * right now covering the LAYOUTGET we are about to send. 7530 * However, that is not so catastrophic, and there seems 7531 * to be no way to prevent it completely. 7532 */ 7533 if (nfs41_setup_sequence(session, &lgp->args.seq_args, 7534 &lgp->res.seq_res, task)) 7535 return; 7536 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid, 7537 NFS_I(lgp->args.inode)->layout, 7538 lgp->args.ctx->state)) { 7539 rpc_exit(task, NFS4_OK); 7540 } 7541 } 7542 7543 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 7544 { 7545 struct nfs4_layoutget *lgp = calldata; 7546 struct inode *inode = lgp->args.inode; 7547 struct nfs_server *server = NFS_SERVER(inode); 7548 struct pnfs_layout_hdr *lo; 7549 struct nfs4_state *state = NULL; 7550 unsigned long timeo, now, giveup; 7551 7552 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 7553 7554 if (!nfs41_sequence_done(task, &lgp->res.seq_res)) 7555 goto out; 7556 7557 switch (task->tk_status) { 7558 case 0: 7559 goto out; 7560 /* 7561 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 7562 * (or clients) writing to the same RAID stripe 7563 */ 7564 case -NFS4ERR_LAYOUTTRYLATER: 7565 /* 7566 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall 7567 * existing layout before getting a new one). 7568 */ 7569 case -NFS4ERR_RECALLCONFLICT: 7570 timeo = rpc_get_timeout(task->tk_client); 7571 giveup = lgp->args.timestamp + timeo; 7572 now = jiffies; 7573 if (time_after(giveup, now)) { 7574 unsigned long delay; 7575 7576 /* Delay for: 7577 * - Not less then NFS4_POLL_RETRY_MIN. 7578 * - One last time a jiffie before we give up 7579 * - exponential backoff (time_now minus start_attempt) 7580 */ 7581 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN, 7582 min((giveup - now - 1), 7583 now - lgp->args.timestamp)); 7584 7585 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n", 7586 __func__, delay); 7587 rpc_delay(task, delay); 7588 task->tk_status = 0; 7589 rpc_restart_call_prepare(task); 7590 goto out; /* Do not call nfs4_async_handle_error() */ 7591 } 7592 break; 7593 case -NFS4ERR_EXPIRED: 7594 case -NFS4ERR_BAD_STATEID: 7595 spin_lock(&inode->i_lock); 7596 lo = NFS_I(inode)->layout; 7597 if (!lo || list_empty(&lo->plh_segs)) { 7598 spin_unlock(&inode->i_lock); 7599 /* If the open stateid was bad, then recover it. */ 7600 state = lgp->args.ctx->state; 7601 } else { 7602 LIST_HEAD(head); 7603 7604 /* 7605 * Mark the bad layout state as invalid, then retry 7606 * with the current stateid. 7607 */ 7608 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL); 7609 spin_unlock(&inode->i_lock); 7610 pnfs_free_lseg_list(&head); 7611 7612 task->tk_status = 0; 7613 rpc_restart_call_prepare(task); 7614 } 7615 } 7616 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) 7617 rpc_restart_call_prepare(task); 7618 out: 7619 dprintk("<-- %s\n", __func__); 7620 } 7621 7622 static size_t max_response_pages(struct nfs_server *server) 7623 { 7624 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 7625 return nfs_page_array_len(0, max_resp_sz); 7626 } 7627 7628 static void nfs4_free_pages(struct page **pages, size_t size) 7629 { 7630 int i; 7631 7632 if (!pages) 7633 return; 7634 7635 for (i = 0; i < size; i++) { 7636 if (!pages[i]) 7637 break; 7638 __free_page(pages[i]); 7639 } 7640 kfree(pages); 7641 } 7642 7643 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 7644 { 7645 struct page **pages; 7646 int i; 7647 7648 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 7649 if (!pages) { 7650 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 7651 return NULL; 7652 } 7653 7654 for (i = 0; i < size; i++) { 7655 pages[i] = alloc_page(gfp_flags); 7656 if (!pages[i]) { 7657 dprintk("%s: failed to allocate page\n", __func__); 7658 nfs4_free_pages(pages, size); 7659 return NULL; 7660 } 7661 } 7662 7663 return pages; 7664 } 7665 7666 static void nfs4_layoutget_release(void *calldata) 7667 { 7668 struct nfs4_layoutget *lgp = calldata; 7669 struct inode *inode = lgp->args.inode; 7670 struct nfs_server *server = NFS_SERVER(inode); 7671 size_t max_pages = max_response_pages(server); 7672 7673 dprintk("--> %s\n", __func__); 7674 nfs4_free_pages(lgp->args.layout.pages, max_pages); 7675 pnfs_put_layout_hdr(NFS_I(inode)->layout); 7676 put_nfs_open_context(lgp->args.ctx); 7677 kfree(calldata); 7678 dprintk("<-- %s\n", __func__); 7679 } 7680 7681 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 7682 .rpc_call_prepare = nfs4_layoutget_prepare, 7683 .rpc_call_done = nfs4_layoutget_done, 7684 .rpc_release = nfs4_layoutget_release, 7685 }; 7686 7687 struct pnfs_layout_segment * 7688 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) 7689 { 7690 struct inode *inode = lgp->args.inode; 7691 struct nfs_server *server = NFS_SERVER(inode); 7692 size_t max_pages = max_response_pages(server); 7693 struct rpc_task *task; 7694 struct rpc_message msg = { 7695 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 7696 .rpc_argp = &lgp->args, 7697 .rpc_resp = &lgp->res, 7698 .rpc_cred = lgp->cred, 7699 }; 7700 struct rpc_task_setup task_setup_data = { 7701 .rpc_client = server->client, 7702 .rpc_message = &msg, 7703 .callback_ops = &nfs4_layoutget_call_ops, 7704 .callback_data = lgp, 7705 .flags = RPC_TASK_ASYNC, 7706 }; 7707 struct pnfs_layout_segment *lseg = NULL; 7708 int status = 0; 7709 7710 dprintk("--> %s\n", __func__); 7711 7712 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 7713 if (!lgp->args.layout.pages) { 7714 nfs4_layoutget_release(lgp); 7715 return ERR_PTR(-ENOMEM); 7716 } 7717 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 7718 lgp->args.timestamp = jiffies; 7719 7720 lgp->res.layoutp = &lgp->args.layout; 7721 lgp->res.seq_res.sr_slot = NULL; 7722 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 7723 7724 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 7725 pnfs_get_layout_hdr(NFS_I(inode)->layout); 7726 7727 task = rpc_run_task(&task_setup_data); 7728 if (IS_ERR(task)) 7729 return ERR_CAST(task); 7730 status = nfs4_wait_for_completion_rpc_task(task); 7731 if (status == 0) 7732 status = task->tk_status; 7733 trace_nfs4_layoutget(lgp->args.ctx, 7734 &lgp->args.range, 7735 &lgp->res.range, 7736 status); 7737 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 7738 if (status == 0 && lgp->res.layoutp->len) 7739 lseg = pnfs_layout_process(lgp); 7740 rpc_put_task(task); 7741 dprintk("<-- %s status=%d\n", __func__, status); 7742 if (status) 7743 return ERR_PTR(status); 7744 return lseg; 7745 } 7746 7747 static void 7748 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 7749 { 7750 struct nfs4_layoutreturn *lrp = calldata; 7751 7752 dprintk("--> %s\n", __func__); 7753 nfs41_setup_sequence(lrp->clp->cl_session, 7754 &lrp->args.seq_args, 7755 &lrp->res.seq_res, 7756 task); 7757 } 7758 7759 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 7760 { 7761 struct nfs4_layoutreturn *lrp = calldata; 7762 struct nfs_server *server; 7763 7764 dprintk("--> %s\n", __func__); 7765 7766 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 7767 return; 7768 7769 server = NFS_SERVER(lrp->args.inode); 7770 switch (task->tk_status) { 7771 default: 7772 task->tk_status = 0; 7773 case 0: 7774 break; 7775 case -NFS4ERR_DELAY: 7776 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 7777 break; 7778 rpc_restart_call_prepare(task); 7779 return; 7780 } 7781 dprintk("<-- %s\n", __func__); 7782 } 7783 7784 static void nfs4_layoutreturn_release(void *calldata) 7785 { 7786 struct nfs4_layoutreturn *lrp = calldata; 7787 struct pnfs_layout_hdr *lo = lrp->args.layout; 7788 7789 dprintk("--> %s\n", __func__); 7790 spin_lock(&lo->plh_inode->i_lock); 7791 if (lrp->res.lrs_present) 7792 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 7793 lo->plh_block_lgets--; 7794 spin_unlock(&lo->plh_inode->i_lock); 7795 pnfs_put_layout_hdr(lrp->args.layout); 7796 kfree(calldata); 7797 dprintk("<-- %s\n", __func__); 7798 } 7799 7800 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 7801 .rpc_call_prepare = nfs4_layoutreturn_prepare, 7802 .rpc_call_done = nfs4_layoutreturn_done, 7803 .rpc_release = nfs4_layoutreturn_release, 7804 }; 7805 7806 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp) 7807 { 7808 struct rpc_task *task; 7809 struct rpc_message msg = { 7810 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 7811 .rpc_argp = &lrp->args, 7812 .rpc_resp = &lrp->res, 7813 .rpc_cred = lrp->cred, 7814 }; 7815 struct rpc_task_setup task_setup_data = { 7816 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 7817 .rpc_message = &msg, 7818 .callback_ops = &nfs4_layoutreturn_call_ops, 7819 .callback_data = lrp, 7820 }; 7821 int status; 7822 7823 dprintk("--> %s\n", __func__); 7824 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 7825 task = rpc_run_task(&task_setup_data); 7826 if (IS_ERR(task)) 7827 return PTR_ERR(task); 7828 status = task->tk_status; 7829 trace_nfs4_layoutreturn(lrp->args.inode, status); 7830 dprintk("<-- %s status=%d\n", __func__, status); 7831 rpc_put_task(task); 7832 return status; 7833 } 7834 7835 static int 7836 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 7837 struct pnfs_device *pdev, 7838 struct rpc_cred *cred) 7839 { 7840 struct nfs4_getdeviceinfo_args args = { 7841 .pdev = pdev, 7842 }; 7843 struct nfs4_getdeviceinfo_res res = { 7844 .pdev = pdev, 7845 }; 7846 struct rpc_message msg = { 7847 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 7848 .rpc_argp = &args, 7849 .rpc_resp = &res, 7850 .rpc_cred = cred, 7851 }; 7852 int status; 7853 7854 dprintk("--> %s\n", __func__); 7855 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 7856 dprintk("<-- %s status=%d\n", __func__, status); 7857 7858 return status; 7859 } 7860 7861 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 7862 struct pnfs_device *pdev, 7863 struct rpc_cred *cred) 7864 { 7865 struct nfs4_exception exception = { }; 7866 int err; 7867 7868 do { 7869 err = nfs4_handle_exception(server, 7870 _nfs4_proc_getdeviceinfo(server, pdev, cred), 7871 &exception); 7872 } while (exception.retry); 7873 return err; 7874 } 7875 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 7876 7877 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 7878 { 7879 struct nfs4_layoutcommit_data *data = calldata; 7880 struct nfs_server *server = NFS_SERVER(data->args.inode); 7881 struct nfs4_session *session = nfs4_get_session(server); 7882 7883 nfs41_setup_sequence(session, 7884 &data->args.seq_args, 7885 &data->res.seq_res, 7886 task); 7887 } 7888 7889 static void 7890 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 7891 { 7892 struct nfs4_layoutcommit_data *data = calldata; 7893 struct nfs_server *server = NFS_SERVER(data->args.inode); 7894 7895 if (!nfs41_sequence_done(task, &data->res.seq_res)) 7896 return; 7897 7898 switch (task->tk_status) { /* Just ignore these failures */ 7899 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 7900 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 7901 case -NFS4ERR_BADLAYOUT: /* no layout */ 7902 case -NFS4ERR_GRACE: /* loca_recalim always false */ 7903 task->tk_status = 0; 7904 case 0: 7905 break; 7906 default: 7907 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 7908 rpc_restart_call_prepare(task); 7909 return; 7910 } 7911 } 7912 } 7913 7914 static void nfs4_layoutcommit_release(void *calldata) 7915 { 7916 struct nfs4_layoutcommit_data *data = calldata; 7917 7918 pnfs_cleanup_layoutcommit(data); 7919 nfs_post_op_update_inode_force_wcc(data->args.inode, 7920 data->res.fattr); 7921 put_rpccred(data->cred); 7922 kfree(data); 7923 } 7924 7925 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 7926 .rpc_call_prepare = nfs4_layoutcommit_prepare, 7927 .rpc_call_done = nfs4_layoutcommit_done, 7928 .rpc_release = nfs4_layoutcommit_release, 7929 }; 7930 7931 int 7932 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 7933 { 7934 struct rpc_message msg = { 7935 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 7936 .rpc_argp = &data->args, 7937 .rpc_resp = &data->res, 7938 .rpc_cred = data->cred, 7939 }; 7940 struct rpc_task_setup task_setup_data = { 7941 .task = &data->task, 7942 .rpc_client = NFS_CLIENT(data->args.inode), 7943 .rpc_message = &msg, 7944 .callback_ops = &nfs4_layoutcommit_ops, 7945 .callback_data = data, 7946 .flags = RPC_TASK_ASYNC, 7947 }; 7948 struct rpc_task *task; 7949 int status = 0; 7950 7951 dprintk("NFS: %4d initiating layoutcommit call. sync %d " 7952 "lbw: %llu inode %lu\n", 7953 data->task.tk_pid, sync, 7954 data->args.lastbytewritten, 7955 data->args.inode->i_ino); 7956 7957 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 7958 task = rpc_run_task(&task_setup_data); 7959 if (IS_ERR(task)) 7960 return PTR_ERR(task); 7961 if (sync == false) 7962 goto out; 7963 status = nfs4_wait_for_completion_rpc_task(task); 7964 if (status != 0) 7965 goto out; 7966 status = task->tk_status; 7967 trace_nfs4_layoutcommit(data->args.inode, status); 7968 out: 7969 dprintk("%s: status %d\n", __func__, status); 7970 rpc_put_task(task); 7971 return status; 7972 } 7973 7974 /** 7975 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 7976 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 7977 */ 7978 static int 7979 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 7980 struct nfs_fsinfo *info, 7981 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7982 { 7983 struct nfs41_secinfo_no_name_args args = { 7984 .style = SECINFO_STYLE_CURRENT_FH, 7985 }; 7986 struct nfs4_secinfo_res res = { 7987 .flavors = flavors, 7988 }; 7989 struct rpc_message msg = { 7990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 7991 .rpc_argp = &args, 7992 .rpc_resp = &res, 7993 }; 7994 struct rpc_clnt *clnt = server->client; 7995 struct rpc_cred *cred = NULL; 7996 int status; 7997 7998 if (use_integrity) { 7999 clnt = server->nfs_client->cl_rpcclient; 8000 cred = nfs4_get_clid_cred(server->nfs_client); 8001 msg.rpc_cred = cred; 8002 } 8003 8004 dprintk("--> %s\n", __func__); 8005 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 8006 &res.seq_res, 0); 8007 dprintk("<-- %s status=%d\n", __func__, status); 8008 8009 if (cred) 8010 put_rpccred(cred); 8011 8012 return status; 8013 } 8014 8015 static int 8016 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 8017 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 8018 { 8019 struct nfs4_exception exception = { }; 8020 int err; 8021 do { 8022 /* first try using integrity protection */ 8023 err = -NFS4ERR_WRONGSEC; 8024 8025 /* try to use integrity protection with machine cred */ 8026 if (_nfs4_is_integrity_protected(server->nfs_client)) 8027 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8028 flavors, true); 8029 8030 /* 8031 * if unable to use integrity protection, or SECINFO with 8032 * integrity protection returns NFS4ERR_WRONGSEC (which is 8033 * disallowed by spec, but exists in deployed servers) use 8034 * the current filesystem's rpc_client and the user cred. 8035 */ 8036 if (err == -NFS4ERR_WRONGSEC) 8037 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8038 flavors, false); 8039 8040 switch (err) { 8041 case 0: 8042 case -NFS4ERR_WRONGSEC: 8043 case -ENOTSUPP: 8044 goto out; 8045 default: 8046 err = nfs4_handle_exception(server, err, &exception); 8047 } 8048 } while (exception.retry); 8049 out: 8050 return err; 8051 } 8052 8053 static int 8054 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 8055 struct nfs_fsinfo *info) 8056 { 8057 int err; 8058 struct page *page; 8059 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 8060 struct nfs4_secinfo_flavors *flavors; 8061 struct nfs4_secinfo4 *secinfo; 8062 int i; 8063 8064 page = alloc_page(GFP_KERNEL); 8065 if (!page) { 8066 err = -ENOMEM; 8067 goto out; 8068 } 8069 8070 flavors = page_address(page); 8071 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 8072 8073 /* 8074 * Fall back on "guess and check" method if 8075 * the server doesn't support SECINFO_NO_NAME 8076 */ 8077 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 8078 err = nfs4_find_root_sec(server, fhandle, info); 8079 goto out_freepage; 8080 } 8081 if (err) 8082 goto out_freepage; 8083 8084 for (i = 0; i < flavors->num_flavors; i++) { 8085 secinfo = &flavors->flavors[i]; 8086 8087 switch (secinfo->flavor) { 8088 case RPC_AUTH_NULL: 8089 case RPC_AUTH_UNIX: 8090 case RPC_AUTH_GSS: 8091 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 8092 &secinfo->flavor_info); 8093 break; 8094 default: 8095 flavor = RPC_AUTH_MAXFLAVOR; 8096 break; 8097 } 8098 8099 if (!nfs_auth_info_match(&server->auth_info, flavor)) 8100 flavor = RPC_AUTH_MAXFLAVOR; 8101 8102 if (flavor != RPC_AUTH_MAXFLAVOR) { 8103 err = nfs4_lookup_root_sec(server, fhandle, 8104 info, flavor); 8105 if (!err) 8106 break; 8107 } 8108 } 8109 8110 if (flavor == RPC_AUTH_MAXFLAVOR) 8111 err = -EPERM; 8112 8113 out_freepage: 8114 put_page(page); 8115 if (err == -EACCES) 8116 return -EPERM; 8117 out: 8118 return err; 8119 } 8120 8121 static int _nfs41_test_stateid(struct nfs_server *server, 8122 nfs4_stateid *stateid, 8123 struct rpc_cred *cred) 8124 { 8125 int status; 8126 struct nfs41_test_stateid_args args = { 8127 .stateid = stateid, 8128 }; 8129 struct nfs41_test_stateid_res res; 8130 struct rpc_message msg = { 8131 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 8132 .rpc_argp = &args, 8133 .rpc_resp = &res, 8134 .rpc_cred = cred, 8135 }; 8136 struct rpc_clnt *rpc_client = server->client; 8137 8138 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8139 &rpc_client, &msg); 8140 8141 dprintk("NFS call test_stateid %p\n", stateid); 8142 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 8143 nfs4_set_sequence_privileged(&args.seq_args); 8144 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 8145 &args.seq_args, &res.seq_res); 8146 if (status != NFS_OK) { 8147 dprintk("NFS reply test_stateid: failed, %d\n", status); 8148 return status; 8149 } 8150 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 8151 return -res.status; 8152 } 8153 8154 /** 8155 * nfs41_test_stateid - perform a TEST_STATEID operation 8156 * 8157 * @server: server / transport on which to perform the operation 8158 * @stateid: state ID to test 8159 * @cred: credential 8160 * 8161 * Returns NFS_OK if the server recognizes that "stateid" is valid. 8162 * Otherwise a negative NFS4ERR value is returned if the operation 8163 * failed or the state ID is not currently valid. 8164 */ 8165 static int nfs41_test_stateid(struct nfs_server *server, 8166 nfs4_stateid *stateid, 8167 struct rpc_cred *cred) 8168 { 8169 struct nfs4_exception exception = { }; 8170 int err; 8171 do { 8172 err = _nfs41_test_stateid(server, stateid, cred); 8173 if (err != -NFS4ERR_DELAY) 8174 break; 8175 nfs4_handle_exception(server, err, &exception); 8176 } while (exception.retry); 8177 return err; 8178 } 8179 8180 struct nfs_free_stateid_data { 8181 struct nfs_server *server; 8182 struct nfs41_free_stateid_args args; 8183 struct nfs41_free_stateid_res res; 8184 }; 8185 8186 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 8187 { 8188 struct nfs_free_stateid_data *data = calldata; 8189 nfs41_setup_sequence(nfs4_get_session(data->server), 8190 &data->args.seq_args, 8191 &data->res.seq_res, 8192 task); 8193 } 8194 8195 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 8196 { 8197 struct nfs_free_stateid_data *data = calldata; 8198 8199 nfs41_sequence_done(task, &data->res.seq_res); 8200 8201 switch (task->tk_status) { 8202 case -NFS4ERR_DELAY: 8203 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 8204 rpc_restart_call_prepare(task); 8205 } 8206 } 8207 8208 static void nfs41_free_stateid_release(void *calldata) 8209 { 8210 kfree(calldata); 8211 } 8212 8213 static const struct rpc_call_ops nfs41_free_stateid_ops = { 8214 .rpc_call_prepare = nfs41_free_stateid_prepare, 8215 .rpc_call_done = nfs41_free_stateid_done, 8216 .rpc_release = nfs41_free_stateid_release, 8217 }; 8218 8219 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 8220 nfs4_stateid *stateid, 8221 struct rpc_cred *cred, 8222 bool privileged) 8223 { 8224 struct rpc_message msg = { 8225 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 8226 .rpc_cred = cred, 8227 }; 8228 struct rpc_task_setup task_setup = { 8229 .rpc_client = server->client, 8230 .rpc_message = &msg, 8231 .callback_ops = &nfs41_free_stateid_ops, 8232 .flags = RPC_TASK_ASYNC, 8233 }; 8234 struct nfs_free_stateid_data *data; 8235 8236 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8237 &task_setup.rpc_client, &msg); 8238 8239 dprintk("NFS call free_stateid %p\n", stateid); 8240 data = kmalloc(sizeof(*data), GFP_NOFS); 8241 if (!data) 8242 return ERR_PTR(-ENOMEM); 8243 data->server = server; 8244 nfs4_stateid_copy(&data->args.stateid, stateid); 8245 8246 task_setup.callback_data = data; 8247 8248 msg.rpc_argp = &data->args; 8249 msg.rpc_resp = &data->res; 8250 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 8251 if (privileged) 8252 nfs4_set_sequence_privileged(&data->args.seq_args); 8253 8254 return rpc_run_task(&task_setup); 8255 } 8256 8257 /** 8258 * nfs41_free_stateid - perform a FREE_STATEID operation 8259 * 8260 * @server: server / transport on which to perform the operation 8261 * @stateid: state ID to release 8262 * @cred: credential 8263 * 8264 * Returns NFS_OK if the server freed "stateid". Otherwise a 8265 * negative NFS4ERR value is returned. 8266 */ 8267 static int nfs41_free_stateid(struct nfs_server *server, 8268 nfs4_stateid *stateid, 8269 struct rpc_cred *cred) 8270 { 8271 struct rpc_task *task; 8272 int ret; 8273 8274 task = _nfs41_free_stateid(server, stateid, cred, true); 8275 if (IS_ERR(task)) 8276 return PTR_ERR(task); 8277 ret = rpc_wait_for_completion_task(task); 8278 if (!ret) 8279 ret = task->tk_status; 8280 rpc_put_task(task); 8281 return ret; 8282 } 8283 8284 static void 8285 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 8286 { 8287 struct rpc_task *task; 8288 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 8289 8290 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 8291 nfs4_free_lock_state(server, lsp); 8292 if (IS_ERR(task)) 8293 return; 8294 rpc_put_task(task); 8295 } 8296 8297 static bool nfs41_match_stateid(const nfs4_stateid *s1, 8298 const nfs4_stateid *s2) 8299 { 8300 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 8301 return false; 8302 8303 if (s1->seqid == s2->seqid) 8304 return true; 8305 if (s1->seqid == 0 || s2->seqid == 0) 8306 return true; 8307 8308 return false; 8309 } 8310 8311 #endif /* CONFIG_NFS_V4_1 */ 8312 8313 static bool nfs4_match_stateid(const nfs4_stateid *s1, 8314 const nfs4_stateid *s2) 8315 { 8316 return nfs4_stateid_match(s1, s2); 8317 } 8318 8319 8320 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 8321 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8322 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8323 .recover_open = nfs4_open_reclaim, 8324 .recover_lock = nfs4_lock_reclaim, 8325 .establish_clid = nfs4_init_clientid, 8326 .detect_trunking = nfs40_discover_server_trunking, 8327 }; 8328 8329 #if defined(CONFIG_NFS_V4_1) 8330 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 8331 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8332 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8333 .recover_open = nfs4_open_reclaim, 8334 .recover_lock = nfs4_lock_reclaim, 8335 .establish_clid = nfs41_init_clientid, 8336 .reclaim_complete = nfs41_proc_reclaim_complete, 8337 .detect_trunking = nfs41_discover_server_trunking, 8338 }; 8339 #endif /* CONFIG_NFS_V4_1 */ 8340 8341 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 8342 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8343 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8344 .recover_open = nfs4_open_expired, 8345 .recover_lock = nfs4_lock_expired, 8346 .establish_clid = nfs4_init_clientid, 8347 }; 8348 8349 #if defined(CONFIG_NFS_V4_1) 8350 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 8351 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8352 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8353 .recover_open = nfs41_open_expired, 8354 .recover_lock = nfs41_lock_expired, 8355 .establish_clid = nfs41_init_clientid, 8356 }; 8357 #endif /* CONFIG_NFS_V4_1 */ 8358 8359 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 8360 .sched_state_renewal = nfs4_proc_async_renew, 8361 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 8362 .renew_lease = nfs4_proc_renew, 8363 }; 8364 8365 #if defined(CONFIG_NFS_V4_1) 8366 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 8367 .sched_state_renewal = nfs41_proc_async_sequence, 8368 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 8369 .renew_lease = nfs4_proc_sequence, 8370 }; 8371 #endif 8372 8373 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 8374 .get_locations = _nfs40_proc_get_locations, 8375 .fsid_present = _nfs40_proc_fsid_present, 8376 }; 8377 8378 #if defined(CONFIG_NFS_V4_1) 8379 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 8380 .get_locations = _nfs41_proc_get_locations, 8381 .fsid_present = _nfs41_proc_fsid_present, 8382 }; 8383 #endif /* CONFIG_NFS_V4_1 */ 8384 8385 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 8386 .minor_version = 0, 8387 .init_caps = NFS_CAP_READDIRPLUS 8388 | NFS_CAP_ATOMIC_OPEN 8389 | NFS_CAP_CHANGE_ATTR 8390 | NFS_CAP_POSIX_LOCK, 8391 .init_client = nfs40_init_client, 8392 .shutdown_client = nfs40_shutdown_client, 8393 .match_stateid = nfs4_match_stateid, 8394 .find_root_sec = nfs4_find_root_sec, 8395 .free_lock_state = nfs4_release_lockowner, 8396 .call_sync_ops = &nfs40_call_sync_ops, 8397 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 8398 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 8399 .state_renewal_ops = &nfs40_state_renewal_ops, 8400 .mig_recovery_ops = &nfs40_mig_recovery_ops, 8401 }; 8402 8403 #if defined(CONFIG_NFS_V4_1) 8404 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 8405 .minor_version = 1, 8406 .init_caps = NFS_CAP_READDIRPLUS 8407 | NFS_CAP_ATOMIC_OPEN 8408 | NFS_CAP_CHANGE_ATTR 8409 | NFS_CAP_POSIX_LOCK 8410 | NFS_CAP_STATEID_NFSV41 8411 | NFS_CAP_ATOMIC_OPEN_V1 8412 | NFS_CAP_SEEK, 8413 .init_client = nfs41_init_client, 8414 .shutdown_client = nfs41_shutdown_client, 8415 .match_stateid = nfs41_match_stateid, 8416 .find_root_sec = nfs41_find_root_sec, 8417 .free_lock_state = nfs41_free_lock_state, 8418 .call_sync_ops = &nfs41_call_sync_ops, 8419 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8420 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8421 .state_renewal_ops = &nfs41_state_renewal_ops, 8422 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8423 }; 8424 #endif 8425 8426 #if defined(CONFIG_NFS_V4_2) 8427 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 8428 .minor_version = 2, 8429 .init_caps = NFS_CAP_READDIRPLUS 8430 | NFS_CAP_ATOMIC_OPEN 8431 | NFS_CAP_CHANGE_ATTR 8432 | NFS_CAP_POSIX_LOCK 8433 | NFS_CAP_STATEID_NFSV41 8434 | NFS_CAP_ATOMIC_OPEN_V1, 8435 .init_client = nfs41_init_client, 8436 .shutdown_client = nfs41_shutdown_client, 8437 .match_stateid = nfs41_match_stateid, 8438 .find_root_sec = nfs41_find_root_sec, 8439 .free_lock_state = nfs41_free_lock_state, 8440 .call_sync_ops = &nfs41_call_sync_ops, 8441 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8442 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8443 .state_renewal_ops = &nfs41_state_renewal_ops, 8444 }; 8445 #endif 8446 8447 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 8448 [0] = &nfs_v4_0_minor_ops, 8449 #if defined(CONFIG_NFS_V4_1) 8450 [1] = &nfs_v4_1_minor_ops, 8451 #endif 8452 #if defined(CONFIG_NFS_V4_2) 8453 [2] = &nfs_v4_2_minor_ops, 8454 #endif 8455 }; 8456 8457 static const struct inode_operations nfs4_dir_inode_operations = { 8458 .create = nfs_create, 8459 .lookup = nfs_lookup, 8460 .atomic_open = nfs_atomic_open, 8461 .link = nfs_link, 8462 .unlink = nfs_unlink, 8463 .symlink = nfs_symlink, 8464 .mkdir = nfs_mkdir, 8465 .rmdir = nfs_rmdir, 8466 .mknod = nfs_mknod, 8467 .rename = nfs_rename, 8468 .permission = nfs_permission, 8469 .getattr = nfs_getattr, 8470 .setattr = nfs_setattr, 8471 .getxattr = generic_getxattr, 8472 .setxattr = generic_setxattr, 8473 .listxattr = generic_listxattr, 8474 .removexattr = generic_removexattr, 8475 }; 8476 8477 static const struct inode_operations nfs4_file_inode_operations = { 8478 .permission = nfs_permission, 8479 .getattr = nfs_getattr, 8480 .setattr = nfs_setattr, 8481 .getxattr = generic_getxattr, 8482 .setxattr = generic_setxattr, 8483 .listxattr = generic_listxattr, 8484 .removexattr = generic_removexattr, 8485 }; 8486 8487 const struct nfs_rpc_ops nfs_v4_clientops = { 8488 .version = 4, /* protocol version */ 8489 .dentry_ops = &nfs4_dentry_operations, 8490 .dir_inode_ops = &nfs4_dir_inode_operations, 8491 .file_inode_ops = &nfs4_file_inode_operations, 8492 .file_ops = &nfs4_file_operations, 8493 .getroot = nfs4_proc_get_root, 8494 .submount = nfs4_submount, 8495 .try_mount = nfs4_try_mount, 8496 .getattr = nfs4_proc_getattr, 8497 .setattr = nfs4_proc_setattr, 8498 .lookup = nfs4_proc_lookup, 8499 .access = nfs4_proc_access, 8500 .readlink = nfs4_proc_readlink, 8501 .create = nfs4_proc_create, 8502 .remove = nfs4_proc_remove, 8503 .unlink_setup = nfs4_proc_unlink_setup, 8504 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 8505 .unlink_done = nfs4_proc_unlink_done, 8506 .rename_setup = nfs4_proc_rename_setup, 8507 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 8508 .rename_done = nfs4_proc_rename_done, 8509 .link = nfs4_proc_link, 8510 .symlink = nfs4_proc_symlink, 8511 .mkdir = nfs4_proc_mkdir, 8512 .rmdir = nfs4_proc_remove, 8513 .readdir = nfs4_proc_readdir, 8514 .mknod = nfs4_proc_mknod, 8515 .statfs = nfs4_proc_statfs, 8516 .fsinfo = nfs4_proc_fsinfo, 8517 .pathconf = nfs4_proc_pathconf, 8518 .set_capabilities = nfs4_server_capabilities, 8519 .decode_dirent = nfs4_decode_dirent, 8520 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 8521 .read_setup = nfs4_proc_read_setup, 8522 .read_done = nfs4_read_done, 8523 .write_setup = nfs4_proc_write_setup, 8524 .write_done = nfs4_write_done, 8525 .commit_setup = nfs4_proc_commit_setup, 8526 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 8527 .commit_done = nfs4_commit_done, 8528 .lock = nfs4_proc_lock, 8529 .clear_acl_cache = nfs4_zap_acl_attr, 8530 .close_context = nfs4_close_context, 8531 .open_context = nfs4_atomic_open, 8532 .have_delegation = nfs4_have_delegation, 8533 .return_delegation = nfs4_inode_return_delegation, 8534 .alloc_client = nfs4_alloc_client, 8535 .init_client = nfs4_init_client, 8536 .free_client = nfs4_free_client, 8537 .create_server = nfs4_create_server, 8538 .clone_server = nfs_clone_server, 8539 }; 8540 8541 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 8542 .prefix = XATTR_NAME_NFSV4_ACL, 8543 .list = nfs4_xattr_list_nfs4_acl, 8544 .get = nfs4_xattr_get_nfs4_acl, 8545 .set = nfs4_xattr_set_nfs4_acl, 8546 }; 8547 8548 const struct xattr_handler *nfs4_xattr_handlers[] = { 8549 &nfs4_xattr_nfs4_acl_handler, 8550 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 8551 &nfs4_xattr_nfs4_label_handler, 8552 #endif 8553 NULL 8554 }; 8555 8556 /* 8557 * Local variables: 8558 * c-basic-offset: 8 8559 * End: 8560 */ 8561