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 *); 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 int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 318 { 319 int res = 0; 320 321 might_sleep(); 322 323 if (*timeout <= 0) 324 *timeout = NFS4_POLL_RETRY_MIN; 325 if (*timeout > NFS4_POLL_RETRY_MAX) 326 *timeout = NFS4_POLL_RETRY_MAX; 327 freezable_schedule_timeout_killable_unsafe(*timeout); 328 if (fatal_signal_pending(current)) 329 res = -ERESTARTSYS; 330 *timeout <<= 1; 331 return res; 332 } 333 334 /* This is the error handling routine for processes that are allowed 335 * to sleep. 336 */ 337 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 338 { 339 struct nfs_client *clp = server->nfs_client; 340 struct nfs4_state *state = exception->state; 341 struct inode *inode = exception->inode; 342 int ret = errorcode; 343 344 exception->retry = 0; 345 switch(errorcode) { 346 case 0: 347 return 0; 348 case -NFS4ERR_OPENMODE: 349 if (inode && nfs4_have_delegation(inode, FMODE_READ)) { 350 nfs4_inode_return_delegation(inode); 351 exception->retry = 1; 352 return 0; 353 } 354 if (state == NULL) 355 break; 356 ret = nfs4_schedule_stateid_recovery(server, state); 357 if (ret < 0) 358 break; 359 goto wait_on_recovery; 360 case -NFS4ERR_DELEG_REVOKED: 361 case -NFS4ERR_ADMIN_REVOKED: 362 case -NFS4ERR_BAD_STATEID: 363 if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) { 364 nfs_remove_bad_delegation(inode); 365 exception->retry = 1; 366 break; 367 } 368 if (state == NULL) 369 break; 370 ret = nfs4_schedule_stateid_recovery(server, state); 371 if (ret < 0) 372 break; 373 goto wait_on_recovery; 374 case -NFS4ERR_EXPIRED: 375 if (state != NULL) { 376 ret = nfs4_schedule_stateid_recovery(server, state); 377 if (ret < 0) 378 break; 379 } 380 case -NFS4ERR_STALE_STATEID: 381 case -NFS4ERR_STALE_CLIENTID: 382 nfs4_schedule_lease_recovery(clp); 383 goto wait_on_recovery; 384 case -NFS4ERR_MOVED: 385 ret = nfs4_schedule_migration_recovery(server); 386 if (ret < 0) 387 break; 388 goto wait_on_recovery; 389 case -NFS4ERR_LEASE_MOVED: 390 nfs4_schedule_lease_moved_recovery(clp); 391 goto wait_on_recovery; 392 #if defined(CONFIG_NFS_V4_1) 393 case -NFS4ERR_BADSESSION: 394 case -NFS4ERR_BADSLOT: 395 case -NFS4ERR_BAD_HIGH_SLOT: 396 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 397 case -NFS4ERR_DEADSESSION: 398 case -NFS4ERR_SEQ_FALSE_RETRY: 399 case -NFS4ERR_SEQ_MISORDERED: 400 dprintk("%s ERROR: %d Reset session\n", __func__, 401 errorcode); 402 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 403 goto wait_on_recovery; 404 #endif /* defined(CONFIG_NFS_V4_1) */ 405 case -NFS4ERR_FILE_OPEN: 406 if (exception->timeout > HZ) { 407 /* We have retried a decent amount, time to 408 * fail 409 */ 410 ret = -EBUSY; 411 break; 412 } 413 case -NFS4ERR_GRACE: 414 case -NFS4ERR_DELAY: 415 ret = nfs4_delay(server->client, &exception->timeout); 416 if (ret != 0) 417 break; 418 case -NFS4ERR_RETRY_UNCACHED_REP: 419 case -NFS4ERR_OLD_STATEID: 420 exception->retry = 1; 421 break; 422 case -NFS4ERR_BADOWNER: 423 /* The following works around a Linux server bug! */ 424 case -NFS4ERR_BADNAME: 425 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 426 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 427 exception->retry = 1; 428 printk(KERN_WARNING "NFS: v4 server %s " 429 "does not accept raw " 430 "uid/gids. " 431 "Reenabling the idmapper.\n", 432 server->nfs_client->cl_hostname); 433 } 434 } 435 /* We failed to handle the error */ 436 return nfs4_map_errors(ret); 437 wait_on_recovery: 438 ret = nfs4_wait_clnt_recover(clp); 439 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 440 return -EIO; 441 if (ret == 0) 442 exception->retry = 1; 443 return ret; 444 } 445 446 /* 447 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 448 * or 'false' otherwise. 449 */ 450 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 451 { 452 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 453 454 if (flavor == RPC_AUTH_GSS_KRB5I || 455 flavor == RPC_AUTH_GSS_KRB5P) 456 return true; 457 458 return false; 459 } 460 461 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 462 { 463 spin_lock(&clp->cl_lock); 464 if (time_before(clp->cl_last_renewal,timestamp)) 465 clp->cl_last_renewal = timestamp; 466 spin_unlock(&clp->cl_lock); 467 } 468 469 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 470 { 471 do_renew_lease(server->nfs_client, timestamp); 472 } 473 474 struct nfs4_call_sync_data { 475 const struct nfs_server *seq_server; 476 struct nfs4_sequence_args *seq_args; 477 struct nfs4_sequence_res *seq_res; 478 }; 479 480 static void nfs4_init_sequence(struct nfs4_sequence_args *args, 481 struct nfs4_sequence_res *res, int cache_reply) 482 { 483 args->sa_slot = NULL; 484 args->sa_cache_this = cache_reply; 485 args->sa_privileged = 0; 486 487 res->sr_slot = NULL; 488 } 489 490 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 491 { 492 args->sa_privileged = 1; 493 } 494 495 static int nfs40_setup_sequence(const struct nfs_server *server, 496 struct nfs4_sequence_args *args, 497 struct nfs4_sequence_res *res, 498 struct rpc_task *task) 499 { 500 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl; 501 struct nfs4_slot *slot; 502 503 /* slot already allocated? */ 504 if (res->sr_slot != NULL) 505 goto out_start; 506 507 spin_lock(&tbl->slot_tbl_lock); 508 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 509 goto out_sleep; 510 511 slot = nfs4_alloc_slot(tbl); 512 if (IS_ERR(slot)) { 513 if (slot == ERR_PTR(-ENOMEM)) 514 task->tk_timeout = HZ >> 2; 515 goto out_sleep; 516 } 517 spin_unlock(&tbl->slot_tbl_lock); 518 519 args->sa_slot = slot; 520 res->sr_slot = slot; 521 522 out_start: 523 rpc_call_start(task); 524 return 0; 525 526 out_sleep: 527 if (args->sa_privileged) 528 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 529 NULL, RPC_PRIORITY_PRIVILEGED); 530 else 531 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 532 spin_unlock(&tbl->slot_tbl_lock); 533 return -EAGAIN; 534 } 535 536 static int nfs40_sequence_done(struct rpc_task *task, 537 struct nfs4_sequence_res *res) 538 { 539 struct nfs4_slot *slot = res->sr_slot; 540 struct nfs4_slot_table *tbl; 541 542 if (slot == NULL) 543 goto out; 544 545 tbl = slot->table; 546 spin_lock(&tbl->slot_tbl_lock); 547 if (!nfs41_wake_and_assign_slot(tbl, slot)) 548 nfs4_free_slot(tbl, slot); 549 spin_unlock(&tbl->slot_tbl_lock); 550 551 res->sr_slot = NULL; 552 out: 553 return 1; 554 } 555 556 #if defined(CONFIG_NFS_V4_1) 557 558 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 559 { 560 struct nfs4_session *session; 561 struct nfs4_slot_table *tbl; 562 struct nfs4_slot *slot = res->sr_slot; 563 bool send_new_highest_used_slotid = false; 564 565 tbl = slot->table; 566 session = tbl->session; 567 568 spin_lock(&tbl->slot_tbl_lock); 569 /* Be nice to the server: try to ensure that the last transmitted 570 * value for highest_user_slotid <= target_highest_slotid 571 */ 572 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 573 send_new_highest_used_slotid = true; 574 575 if (nfs41_wake_and_assign_slot(tbl, slot)) { 576 send_new_highest_used_slotid = false; 577 goto out_unlock; 578 } 579 nfs4_free_slot(tbl, slot); 580 581 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 582 send_new_highest_used_slotid = false; 583 out_unlock: 584 spin_unlock(&tbl->slot_tbl_lock); 585 res->sr_slot = NULL; 586 if (send_new_highest_used_slotid) 587 nfs41_server_notify_highest_slotid_update(session->clp); 588 } 589 590 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 591 { 592 struct nfs4_session *session; 593 struct nfs4_slot *slot = res->sr_slot; 594 struct nfs_client *clp; 595 bool interrupted = false; 596 int ret = 1; 597 598 if (slot == NULL) 599 goto out_noaction; 600 /* don't increment the sequence number if the task wasn't sent */ 601 if (!RPC_WAS_SENT(task)) 602 goto out; 603 604 session = slot->table->session; 605 606 if (slot->interrupted) { 607 slot->interrupted = 0; 608 interrupted = true; 609 } 610 611 trace_nfs4_sequence_done(session, res); 612 /* Check the SEQUENCE operation status */ 613 switch (res->sr_status) { 614 case 0: 615 /* Update the slot's sequence and clientid lease timer */ 616 ++slot->seq_nr; 617 clp = session->clp; 618 do_renew_lease(clp, res->sr_timestamp); 619 /* Check sequence flags */ 620 if (res->sr_status_flags != 0) 621 nfs4_schedule_lease_recovery(clp); 622 nfs41_update_target_slotid(slot->table, slot, res); 623 break; 624 case 1: 625 /* 626 * sr_status remains 1 if an RPC level error occurred. 627 * The server may or may not have processed the sequence 628 * operation.. 629 * Mark the slot as having hosted an interrupted RPC call. 630 */ 631 slot->interrupted = 1; 632 goto out; 633 case -NFS4ERR_DELAY: 634 /* The server detected a resend of the RPC call and 635 * returned NFS4ERR_DELAY as per Section 2.10.6.2 636 * of RFC5661. 637 */ 638 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 639 __func__, 640 slot->slot_nr, 641 slot->seq_nr); 642 goto out_retry; 643 case -NFS4ERR_BADSLOT: 644 /* 645 * The slot id we used was probably retired. Try again 646 * using a different slot id. 647 */ 648 goto retry_nowait; 649 case -NFS4ERR_SEQ_MISORDERED: 650 /* 651 * Was the last operation on this sequence interrupted? 652 * If so, retry after bumping the sequence number. 653 */ 654 if (interrupted) { 655 ++slot->seq_nr; 656 goto retry_nowait; 657 } 658 /* 659 * Could this slot have been previously retired? 660 * If so, then the server may be expecting seq_nr = 1! 661 */ 662 if (slot->seq_nr != 1) { 663 slot->seq_nr = 1; 664 goto retry_nowait; 665 } 666 break; 667 case -NFS4ERR_SEQ_FALSE_RETRY: 668 ++slot->seq_nr; 669 goto retry_nowait; 670 default: 671 /* Just update the slot sequence no. */ 672 ++slot->seq_nr; 673 } 674 out: 675 /* The session may be reset by one of the error handlers. */ 676 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 677 nfs41_sequence_free_slot(res); 678 out_noaction: 679 return ret; 680 retry_nowait: 681 if (rpc_restart_call_prepare(task)) { 682 task->tk_status = 0; 683 ret = 0; 684 } 685 goto out; 686 out_retry: 687 if (!rpc_restart_call(task)) 688 goto out; 689 rpc_delay(task, NFS4_POLL_RETRY_MAX); 690 return 0; 691 } 692 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 693 694 static int nfs4_sequence_done(struct rpc_task *task, 695 struct nfs4_sequence_res *res) 696 { 697 if (res->sr_slot == NULL) 698 return 1; 699 if (!res->sr_slot->table->session) 700 return nfs40_sequence_done(task, res); 701 return nfs41_sequence_done(task, res); 702 } 703 704 int nfs41_setup_sequence(struct nfs4_session *session, 705 struct nfs4_sequence_args *args, 706 struct nfs4_sequence_res *res, 707 struct rpc_task *task) 708 { 709 struct nfs4_slot *slot; 710 struct nfs4_slot_table *tbl; 711 712 dprintk("--> %s\n", __func__); 713 /* slot already allocated? */ 714 if (res->sr_slot != NULL) 715 goto out_success; 716 717 tbl = &session->fc_slot_table; 718 719 task->tk_timeout = 0; 720 721 spin_lock(&tbl->slot_tbl_lock); 722 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) && 723 !args->sa_privileged) { 724 /* The state manager will wait until the slot table is empty */ 725 dprintk("%s session is draining\n", __func__); 726 goto out_sleep; 727 } 728 729 slot = nfs4_alloc_slot(tbl); 730 if (IS_ERR(slot)) { 731 /* If out of memory, try again in 1/4 second */ 732 if (slot == ERR_PTR(-ENOMEM)) 733 task->tk_timeout = HZ >> 2; 734 dprintk("<-- %s: no free slots\n", __func__); 735 goto out_sleep; 736 } 737 spin_unlock(&tbl->slot_tbl_lock); 738 739 args->sa_slot = slot; 740 741 dprintk("<-- %s slotid=%u seqid=%u\n", __func__, 742 slot->slot_nr, slot->seq_nr); 743 744 res->sr_slot = slot; 745 res->sr_timestamp = jiffies; 746 res->sr_status_flags = 0; 747 /* 748 * sr_status is only set in decode_sequence, and so will remain 749 * set to 1 if an rpc level failure occurs. 750 */ 751 res->sr_status = 1; 752 trace_nfs4_setup_sequence(session, args); 753 out_success: 754 rpc_call_start(task); 755 return 0; 756 out_sleep: 757 /* Privileged tasks are queued with top priority */ 758 if (args->sa_privileged) 759 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 760 NULL, RPC_PRIORITY_PRIVILEGED); 761 else 762 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 763 spin_unlock(&tbl->slot_tbl_lock); 764 return -EAGAIN; 765 } 766 EXPORT_SYMBOL_GPL(nfs41_setup_sequence); 767 768 static int nfs4_setup_sequence(const struct nfs_server *server, 769 struct nfs4_sequence_args *args, 770 struct nfs4_sequence_res *res, 771 struct rpc_task *task) 772 { 773 struct nfs4_session *session = nfs4_get_session(server); 774 int ret = 0; 775 776 if (!session) 777 return nfs40_setup_sequence(server, args, res, task); 778 779 dprintk("--> %s clp %p session %p sr_slot %u\n", 780 __func__, session->clp, session, res->sr_slot ? 781 res->sr_slot->slot_nr : NFS4_NO_SLOT); 782 783 ret = nfs41_setup_sequence(session, args, res, task); 784 785 dprintk("<-- %s status=%d\n", __func__, ret); 786 return ret; 787 } 788 789 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 790 { 791 struct nfs4_call_sync_data *data = calldata; 792 struct nfs4_session *session = nfs4_get_session(data->seq_server); 793 794 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 795 796 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task); 797 } 798 799 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 800 { 801 struct nfs4_call_sync_data *data = calldata; 802 803 nfs41_sequence_done(task, data->seq_res); 804 } 805 806 static const struct rpc_call_ops nfs41_call_sync_ops = { 807 .rpc_call_prepare = nfs41_call_sync_prepare, 808 .rpc_call_done = nfs41_call_sync_done, 809 }; 810 811 #else /* !CONFIG_NFS_V4_1 */ 812 813 static int nfs4_setup_sequence(const struct nfs_server *server, 814 struct nfs4_sequence_args *args, 815 struct nfs4_sequence_res *res, 816 struct rpc_task *task) 817 { 818 return nfs40_setup_sequence(server, args, res, task); 819 } 820 821 static int nfs4_sequence_done(struct rpc_task *task, 822 struct nfs4_sequence_res *res) 823 { 824 return nfs40_sequence_done(task, res); 825 } 826 827 #endif /* !CONFIG_NFS_V4_1 */ 828 829 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 830 { 831 struct nfs4_call_sync_data *data = calldata; 832 nfs4_setup_sequence(data->seq_server, 833 data->seq_args, data->seq_res, task); 834 } 835 836 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 837 { 838 struct nfs4_call_sync_data *data = calldata; 839 nfs4_sequence_done(task, data->seq_res); 840 } 841 842 static const struct rpc_call_ops nfs40_call_sync_ops = { 843 .rpc_call_prepare = nfs40_call_sync_prepare, 844 .rpc_call_done = nfs40_call_sync_done, 845 }; 846 847 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 848 struct nfs_server *server, 849 struct rpc_message *msg, 850 struct nfs4_sequence_args *args, 851 struct nfs4_sequence_res *res) 852 { 853 int ret; 854 struct rpc_task *task; 855 struct nfs_client *clp = server->nfs_client; 856 struct nfs4_call_sync_data data = { 857 .seq_server = server, 858 .seq_args = args, 859 .seq_res = res, 860 }; 861 struct rpc_task_setup task_setup = { 862 .rpc_client = clnt, 863 .rpc_message = msg, 864 .callback_ops = clp->cl_mvops->call_sync_ops, 865 .callback_data = &data 866 }; 867 868 task = rpc_run_task(&task_setup); 869 if (IS_ERR(task)) 870 ret = PTR_ERR(task); 871 else { 872 ret = task->tk_status; 873 rpc_put_task(task); 874 } 875 return ret; 876 } 877 878 static 879 int nfs4_call_sync(struct rpc_clnt *clnt, 880 struct nfs_server *server, 881 struct rpc_message *msg, 882 struct nfs4_sequence_args *args, 883 struct nfs4_sequence_res *res, 884 int cache_reply) 885 { 886 nfs4_init_sequence(args, res, cache_reply); 887 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 888 } 889 890 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 891 { 892 struct nfs_inode *nfsi = NFS_I(dir); 893 894 spin_lock(&dir->i_lock); 895 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 896 if (!cinfo->atomic || cinfo->before != dir->i_version) 897 nfs_force_lookup_revalidate(dir); 898 dir->i_version = cinfo->after; 899 nfs_fscache_invalidate(dir); 900 spin_unlock(&dir->i_lock); 901 } 902 903 struct nfs4_opendata { 904 struct kref kref; 905 struct nfs_openargs o_arg; 906 struct nfs_openres o_res; 907 struct nfs_open_confirmargs c_arg; 908 struct nfs_open_confirmres c_res; 909 struct nfs4_string owner_name; 910 struct nfs4_string group_name; 911 struct nfs_fattr f_attr; 912 struct nfs4_label *f_label; 913 struct dentry *dir; 914 struct dentry *dentry; 915 struct nfs4_state_owner *owner; 916 struct nfs4_state *state; 917 struct iattr attrs; 918 unsigned long timestamp; 919 unsigned int rpc_done : 1; 920 unsigned int file_created : 1; 921 unsigned int is_recover : 1; 922 int rpc_status; 923 int cancelled; 924 }; 925 926 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 927 int err, struct nfs4_exception *exception) 928 { 929 if (err != -EINVAL) 930 return false; 931 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 932 return false; 933 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 934 exception->retry = 1; 935 return true; 936 } 937 938 static enum open_claim_type4 939 nfs4_map_atomic_open_claim(struct nfs_server *server, 940 enum open_claim_type4 claim) 941 { 942 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 943 return claim; 944 switch (claim) { 945 default: 946 return claim; 947 case NFS4_OPEN_CLAIM_FH: 948 return NFS4_OPEN_CLAIM_NULL; 949 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 950 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 951 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 952 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 953 } 954 } 955 956 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 957 { 958 p->o_res.f_attr = &p->f_attr; 959 p->o_res.f_label = p->f_label; 960 p->o_res.seqid = p->o_arg.seqid; 961 p->c_res.seqid = p->c_arg.seqid; 962 p->o_res.server = p->o_arg.server; 963 p->o_res.access_request = p->o_arg.access; 964 nfs_fattr_init(&p->f_attr); 965 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 966 } 967 968 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 969 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 970 const struct iattr *attrs, 971 struct nfs4_label *label, 972 enum open_claim_type4 claim, 973 gfp_t gfp_mask) 974 { 975 struct dentry *parent = dget_parent(dentry); 976 struct inode *dir = parent->d_inode; 977 struct nfs_server *server = NFS_SERVER(dir); 978 struct nfs4_opendata *p; 979 980 p = kzalloc(sizeof(*p), gfp_mask); 981 if (p == NULL) 982 goto err; 983 984 p->f_label = nfs4_label_alloc(server, gfp_mask); 985 if (IS_ERR(p->f_label)) 986 goto err_free_p; 987 988 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask); 989 if (p->o_arg.seqid == NULL) 990 goto err_free_label; 991 nfs_sb_active(dentry->d_sb); 992 p->dentry = dget(dentry); 993 p->dir = parent; 994 p->owner = sp; 995 atomic_inc(&sp->so_count); 996 p->o_arg.open_flags = flags; 997 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 998 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 999 * will return permission denied for all bits until close */ 1000 if (!(flags & O_EXCL)) { 1001 /* ask server to check for all possible rights as results 1002 * are cached */ 1003 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1004 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE; 1005 } 1006 p->o_arg.clientid = server->nfs_client->cl_clientid; 1007 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1008 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1009 p->o_arg.name = &dentry->d_name; 1010 p->o_arg.server = server; 1011 p->o_arg.bitmask = nfs4_bitmask(server, label); 1012 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1013 p->o_arg.label = label; 1014 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1015 switch (p->o_arg.claim) { 1016 case NFS4_OPEN_CLAIM_NULL: 1017 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1018 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1019 p->o_arg.fh = NFS_FH(dir); 1020 break; 1021 case NFS4_OPEN_CLAIM_PREVIOUS: 1022 case NFS4_OPEN_CLAIM_FH: 1023 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1024 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1025 p->o_arg.fh = NFS_FH(dentry->d_inode); 1026 } 1027 if (attrs != NULL && attrs->ia_valid != 0) { 1028 __u32 verf[2]; 1029 1030 p->o_arg.u.attrs = &p->attrs; 1031 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 1032 1033 verf[0] = jiffies; 1034 verf[1] = current->pid; 1035 memcpy(p->o_arg.u.verifier.data, verf, 1036 sizeof(p->o_arg.u.verifier.data)); 1037 } 1038 p->c_arg.fh = &p->o_res.fh; 1039 p->c_arg.stateid = &p->o_res.stateid; 1040 p->c_arg.seqid = p->o_arg.seqid; 1041 nfs4_init_opendata_res(p); 1042 kref_init(&p->kref); 1043 return p; 1044 1045 err_free_label: 1046 nfs4_label_free(p->f_label); 1047 err_free_p: 1048 kfree(p); 1049 err: 1050 dput(parent); 1051 return NULL; 1052 } 1053 1054 static void nfs4_opendata_free(struct kref *kref) 1055 { 1056 struct nfs4_opendata *p = container_of(kref, 1057 struct nfs4_opendata, kref); 1058 struct super_block *sb = p->dentry->d_sb; 1059 1060 nfs_free_seqid(p->o_arg.seqid); 1061 if (p->state != NULL) 1062 nfs4_put_open_state(p->state); 1063 nfs4_put_state_owner(p->owner); 1064 1065 nfs4_label_free(p->f_label); 1066 1067 dput(p->dir); 1068 dput(p->dentry); 1069 nfs_sb_deactive(sb); 1070 nfs_fattr_free_names(&p->f_attr); 1071 kfree(p->f_attr.mdsthreshold); 1072 kfree(p); 1073 } 1074 1075 static void nfs4_opendata_put(struct nfs4_opendata *p) 1076 { 1077 if (p != NULL) 1078 kref_put(&p->kref, nfs4_opendata_free); 1079 } 1080 1081 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 1082 { 1083 int ret; 1084 1085 ret = rpc_wait_for_completion_task(task); 1086 return ret; 1087 } 1088 1089 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 1090 { 1091 int ret = 0; 1092 1093 if (open_mode & (O_EXCL|O_TRUNC)) 1094 goto out; 1095 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1096 case FMODE_READ: 1097 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1098 && state->n_rdonly != 0; 1099 break; 1100 case FMODE_WRITE: 1101 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1102 && state->n_wronly != 0; 1103 break; 1104 case FMODE_READ|FMODE_WRITE: 1105 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1106 && state->n_rdwr != 0; 1107 } 1108 out: 1109 return ret; 1110 } 1111 1112 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode) 1113 { 1114 if (delegation == NULL) 1115 return 0; 1116 if ((delegation->type & fmode) != fmode) 1117 return 0; 1118 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1119 return 0; 1120 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) 1121 return 0; 1122 nfs_mark_delegation_referenced(delegation); 1123 return 1; 1124 } 1125 1126 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1127 { 1128 switch (fmode) { 1129 case FMODE_WRITE: 1130 state->n_wronly++; 1131 break; 1132 case FMODE_READ: 1133 state->n_rdonly++; 1134 break; 1135 case FMODE_READ|FMODE_WRITE: 1136 state->n_rdwr++; 1137 } 1138 nfs4_state_set_mode_locked(state, state->state | fmode); 1139 } 1140 1141 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1142 { 1143 struct nfs_client *clp = state->owner->so_server->nfs_client; 1144 bool need_recover = false; 1145 1146 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1147 need_recover = true; 1148 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1149 need_recover = true; 1150 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1151 need_recover = true; 1152 if (need_recover) 1153 nfs4_state_mark_reclaim_nograce(clp, state); 1154 } 1155 1156 static bool nfs_need_update_open_stateid(struct nfs4_state *state, 1157 nfs4_stateid *stateid) 1158 { 1159 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0) 1160 return true; 1161 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1162 nfs_test_and_clear_all_open_stateid(state); 1163 return true; 1164 } 1165 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) 1166 return true; 1167 return false; 1168 } 1169 1170 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1171 nfs4_stateid *stateid, fmode_t fmode) 1172 { 1173 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1174 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1175 case FMODE_WRITE: 1176 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1177 break; 1178 case FMODE_READ: 1179 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1180 break; 1181 case 0: 1182 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1183 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1184 clear_bit(NFS_OPEN_STATE, &state->flags); 1185 } 1186 if (stateid == NULL) 1187 return; 1188 if (!nfs_need_update_open_stateid(state, stateid)) 1189 return; 1190 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1191 nfs4_stateid_copy(&state->stateid, stateid); 1192 nfs4_stateid_copy(&state->open_stateid, stateid); 1193 } 1194 1195 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 1196 { 1197 write_seqlock(&state->seqlock); 1198 nfs_clear_open_stateid_locked(state, stateid, fmode); 1199 write_sequnlock(&state->seqlock); 1200 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1201 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1202 } 1203 1204 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 1205 { 1206 switch (fmode) { 1207 case FMODE_READ: 1208 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1209 break; 1210 case FMODE_WRITE: 1211 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1212 break; 1213 case FMODE_READ|FMODE_WRITE: 1214 set_bit(NFS_O_RDWR_STATE, &state->flags); 1215 } 1216 if (!nfs_need_update_open_stateid(state, stateid)) 1217 return; 1218 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1219 nfs4_stateid_copy(&state->stateid, stateid); 1220 nfs4_stateid_copy(&state->open_stateid, stateid); 1221 } 1222 1223 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode) 1224 { 1225 /* 1226 * Protect the call to nfs4_state_set_mode_locked and 1227 * serialise the stateid update 1228 */ 1229 write_seqlock(&state->seqlock); 1230 if (deleg_stateid != NULL) { 1231 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1232 set_bit(NFS_DELEGATED_STATE, &state->flags); 1233 } 1234 if (open_stateid != NULL) 1235 nfs_set_open_stateid_locked(state, open_stateid, fmode); 1236 write_sequnlock(&state->seqlock); 1237 spin_lock(&state->owner->so_lock); 1238 update_open_stateflags(state, fmode); 1239 spin_unlock(&state->owner->so_lock); 1240 } 1241 1242 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode) 1243 { 1244 struct nfs_inode *nfsi = NFS_I(state->inode); 1245 struct nfs_delegation *deleg_cur; 1246 int ret = 0; 1247 1248 fmode &= (FMODE_READ|FMODE_WRITE); 1249 1250 rcu_read_lock(); 1251 deleg_cur = rcu_dereference(nfsi->delegation); 1252 if (deleg_cur == NULL) 1253 goto no_delegation; 1254 1255 spin_lock(&deleg_cur->lock); 1256 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1257 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1258 (deleg_cur->type & fmode) != fmode) 1259 goto no_delegation_unlock; 1260 1261 if (delegation == NULL) 1262 delegation = &deleg_cur->stateid; 1263 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 1264 goto no_delegation_unlock; 1265 1266 nfs_mark_delegation_referenced(deleg_cur); 1267 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode); 1268 ret = 1; 1269 no_delegation_unlock: 1270 spin_unlock(&deleg_cur->lock); 1271 no_delegation: 1272 rcu_read_unlock(); 1273 1274 if (!ret && open_stateid != NULL) { 1275 __update_open_stateid(state, open_stateid, NULL, fmode); 1276 ret = 1; 1277 } 1278 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1279 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1280 1281 return ret; 1282 } 1283 1284 1285 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1286 { 1287 struct nfs_delegation *delegation; 1288 1289 rcu_read_lock(); 1290 delegation = rcu_dereference(NFS_I(inode)->delegation); 1291 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1292 rcu_read_unlock(); 1293 return; 1294 } 1295 rcu_read_unlock(); 1296 nfs4_inode_return_delegation(inode); 1297 } 1298 1299 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1300 { 1301 struct nfs4_state *state = opendata->state; 1302 struct nfs_inode *nfsi = NFS_I(state->inode); 1303 struct nfs_delegation *delegation; 1304 int open_mode = opendata->o_arg.open_flags; 1305 fmode_t fmode = opendata->o_arg.fmode; 1306 nfs4_stateid stateid; 1307 int ret = -EAGAIN; 1308 1309 for (;;) { 1310 if (can_open_cached(state, fmode, open_mode)) { 1311 spin_lock(&state->owner->so_lock); 1312 if (can_open_cached(state, fmode, open_mode)) { 1313 update_open_stateflags(state, fmode); 1314 spin_unlock(&state->owner->so_lock); 1315 goto out_return_state; 1316 } 1317 spin_unlock(&state->owner->so_lock); 1318 } 1319 rcu_read_lock(); 1320 delegation = rcu_dereference(nfsi->delegation); 1321 if (!can_open_delegated(delegation, fmode)) { 1322 rcu_read_unlock(); 1323 break; 1324 } 1325 /* Save the delegation */ 1326 nfs4_stateid_copy(&stateid, &delegation->stateid); 1327 rcu_read_unlock(); 1328 nfs_release_seqid(opendata->o_arg.seqid); 1329 if (!opendata->is_recover) { 1330 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1331 if (ret != 0) 1332 goto out; 1333 } 1334 ret = -EAGAIN; 1335 1336 /* Try to update the stateid using the delegation */ 1337 if (update_open_stateid(state, NULL, &stateid, fmode)) 1338 goto out_return_state; 1339 } 1340 out: 1341 return ERR_PTR(ret); 1342 out_return_state: 1343 atomic_inc(&state->count); 1344 return state; 1345 } 1346 1347 static void 1348 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1349 { 1350 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1351 struct nfs_delegation *delegation; 1352 int delegation_flags = 0; 1353 1354 rcu_read_lock(); 1355 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1356 if (delegation) 1357 delegation_flags = delegation->flags; 1358 rcu_read_unlock(); 1359 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) { 1360 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1361 "returning a delegation for " 1362 "OPEN(CLAIM_DELEGATE_CUR)\n", 1363 clp->cl_hostname); 1364 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1365 nfs_inode_set_delegation(state->inode, 1366 data->owner->so_cred, 1367 &data->o_res); 1368 else 1369 nfs_inode_reclaim_delegation(state->inode, 1370 data->owner->so_cred, 1371 &data->o_res); 1372 } 1373 1374 /* 1375 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1376 * and update the nfs4_state. 1377 */ 1378 static struct nfs4_state * 1379 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1380 { 1381 struct inode *inode = data->state->inode; 1382 struct nfs4_state *state = data->state; 1383 int ret; 1384 1385 if (!data->rpc_done) { 1386 if (data->rpc_status) { 1387 ret = data->rpc_status; 1388 goto err; 1389 } 1390 /* cached opens have already been processed */ 1391 goto update; 1392 } 1393 1394 ret = nfs_refresh_inode(inode, &data->f_attr); 1395 if (ret) 1396 goto err; 1397 1398 if (data->o_res.delegation_type != 0) 1399 nfs4_opendata_check_deleg(data, state); 1400 update: 1401 update_open_stateid(state, &data->o_res.stateid, NULL, 1402 data->o_arg.fmode); 1403 atomic_inc(&state->count); 1404 1405 return state; 1406 err: 1407 return ERR_PTR(ret); 1408 1409 } 1410 1411 static struct nfs4_state * 1412 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1413 { 1414 struct inode *inode; 1415 struct nfs4_state *state = NULL; 1416 int ret; 1417 1418 if (!data->rpc_done) { 1419 state = nfs4_try_open_cached(data); 1420 goto out; 1421 } 1422 1423 ret = -EAGAIN; 1424 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1425 goto err; 1426 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label); 1427 ret = PTR_ERR(inode); 1428 if (IS_ERR(inode)) 1429 goto err; 1430 ret = -ENOMEM; 1431 state = nfs4_get_open_state(inode, data->owner); 1432 if (state == NULL) 1433 goto err_put_inode; 1434 if (data->o_res.delegation_type != 0) 1435 nfs4_opendata_check_deleg(data, state); 1436 update_open_stateid(state, &data->o_res.stateid, NULL, 1437 data->o_arg.fmode); 1438 iput(inode); 1439 out: 1440 nfs_release_seqid(data->o_arg.seqid); 1441 return state; 1442 err_put_inode: 1443 iput(inode); 1444 err: 1445 return ERR_PTR(ret); 1446 } 1447 1448 static struct nfs4_state * 1449 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1450 { 1451 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1452 return _nfs4_opendata_reclaim_to_nfs4_state(data); 1453 return _nfs4_opendata_to_nfs4_state(data); 1454 } 1455 1456 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1457 { 1458 struct nfs_inode *nfsi = NFS_I(state->inode); 1459 struct nfs_open_context *ctx; 1460 1461 spin_lock(&state->inode->i_lock); 1462 list_for_each_entry(ctx, &nfsi->open_files, list) { 1463 if (ctx->state != state) 1464 continue; 1465 get_nfs_open_context(ctx); 1466 spin_unlock(&state->inode->i_lock); 1467 return ctx; 1468 } 1469 spin_unlock(&state->inode->i_lock); 1470 return ERR_PTR(-ENOENT); 1471 } 1472 1473 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 1474 struct nfs4_state *state, enum open_claim_type4 claim) 1475 { 1476 struct nfs4_opendata *opendata; 1477 1478 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 1479 NULL, NULL, claim, GFP_NOFS); 1480 if (opendata == NULL) 1481 return ERR_PTR(-ENOMEM); 1482 opendata->state = state; 1483 atomic_inc(&state->count); 1484 return opendata; 1485 } 1486 1487 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res) 1488 { 1489 struct nfs4_state *newstate; 1490 int ret; 1491 1492 opendata->o_arg.open_flags = 0; 1493 opendata->o_arg.fmode = fmode; 1494 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1495 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1496 nfs4_init_opendata_res(opendata); 1497 ret = _nfs4_recover_proc_open(opendata); 1498 if (ret != 0) 1499 return ret; 1500 newstate = nfs4_opendata_to_nfs4_state(opendata); 1501 if (IS_ERR(newstate)) 1502 return PTR_ERR(newstate); 1503 nfs4_close_state(newstate, fmode); 1504 *res = newstate; 1505 return 0; 1506 } 1507 1508 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1509 { 1510 struct nfs4_state *newstate; 1511 int ret; 1512 1513 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ 1514 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1515 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1516 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1517 /* memory barrier prior to reading state->n_* */ 1518 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1519 clear_bit(NFS_OPEN_STATE, &state->flags); 1520 smp_rmb(); 1521 if (state->n_rdwr != 0) { 1522 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate); 1523 if (ret != 0) 1524 return ret; 1525 if (newstate != state) 1526 return -ESTALE; 1527 } 1528 if (state->n_wronly != 0) { 1529 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate); 1530 if (ret != 0) 1531 return ret; 1532 if (newstate != state) 1533 return -ESTALE; 1534 } 1535 if (state->n_rdonly != 0) { 1536 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate); 1537 if (ret != 0) 1538 return ret; 1539 if (newstate != state) 1540 return -ESTALE; 1541 } 1542 /* 1543 * We may have performed cached opens for all three recoveries. 1544 * Check if we need to update the current stateid. 1545 */ 1546 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1547 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1548 write_seqlock(&state->seqlock); 1549 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1550 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1551 write_sequnlock(&state->seqlock); 1552 } 1553 return 0; 1554 } 1555 1556 /* 1557 * OPEN_RECLAIM: 1558 * reclaim state on the server after a reboot. 1559 */ 1560 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1561 { 1562 struct nfs_delegation *delegation; 1563 struct nfs4_opendata *opendata; 1564 fmode_t delegation_type = 0; 1565 int status; 1566 1567 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1568 NFS4_OPEN_CLAIM_PREVIOUS); 1569 if (IS_ERR(opendata)) 1570 return PTR_ERR(opendata); 1571 rcu_read_lock(); 1572 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1573 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1574 delegation_type = delegation->type; 1575 rcu_read_unlock(); 1576 opendata->o_arg.u.delegation_type = delegation_type; 1577 status = nfs4_open_recover(opendata, state); 1578 nfs4_opendata_put(opendata); 1579 return status; 1580 } 1581 1582 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1583 { 1584 struct nfs_server *server = NFS_SERVER(state->inode); 1585 struct nfs4_exception exception = { }; 1586 int err; 1587 do { 1588 err = _nfs4_do_open_reclaim(ctx, state); 1589 trace_nfs4_open_reclaim(ctx, 0, err); 1590 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 1591 continue; 1592 if (err != -NFS4ERR_DELAY) 1593 break; 1594 nfs4_handle_exception(server, err, &exception); 1595 } while (exception.retry); 1596 return err; 1597 } 1598 1599 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 1600 { 1601 struct nfs_open_context *ctx; 1602 int ret; 1603 1604 ctx = nfs4_state_find_open_context(state); 1605 if (IS_ERR(ctx)) 1606 return -EAGAIN; 1607 ret = nfs4_do_open_reclaim(ctx, state); 1608 put_nfs_open_context(ctx); 1609 return ret; 1610 } 1611 1612 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err) 1613 { 1614 switch (err) { 1615 default: 1616 printk(KERN_ERR "NFS: %s: unhandled error " 1617 "%d.\n", __func__, err); 1618 case 0: 1619 case -ENOENT: 1620 case -ESTALE: 1621 break; 1622 case -NFS4ERR_BADSESSION: 1623 case -NFS4ERR_BADSLOT: 1624 case -NFS4ERR_BAD_HIGH_SLOT: 1625 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1626 case -NFS4ERR_DEADSESSION: 1627 set_bit(NFS_DELEGATED_STATE, &state->flags); 1628 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 1629 return -EAGAIN; 1630 case -NFS4ERR_STALE_CLIENTID: 1631 case -NFS4ERR_STALE_STATEID: 1632 set_bit(NFS_DELEGATED_STATE, &state->flags); 1633 case -NFS4ERR_EXPIRED: 1634 /* Don't recall a delegation if it was lost */ 1635 nfs4_schedule_lease_recovery(server->nfs_client); 1636 return -EAGAIN; 1637 case -NFS4ERR_MOVED: 1638 nfs4_schedule_migration_recovery(server); 1639 return -EAGAIN; 1640 case -NFS4ERR_LEASE_MOVED: 1641 nfs4_schedule_lease_moved_recovery(server->nfs_client); 1642 return -EAGAIN; 1643 case -NFS4ERR_DELEG_REVOKED: 1644 case -NFS4ERR_ADMIN_REVOKED: 1645 case -NFS4ERR_BAD_STATEID: 1646 case -NFS4ERR_OPENMODE: 1647 nfs_inode_find_state_and_recover(state->inode, 1648 stateid); 1649 nfs4_schedule_stateid_recovery(server, state); 1650 return 0; 1651 case -NFS4ERR_DELAY: 1652 case -NFS4ERR_GRACE: 1653 set_bit(NFS_DELEGATED_STATE, &state->flags); 1654 ssleep(1); 1655 return -EAGAIN; 1656 case -ENOMEM: 1657 case -NFS4ERR_DENIED: 1658 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 1659 return 0; 1660 } 1661 return err; 1662 } 1663 1664 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 1665 { 1666 struct nfs_server *server = NFS_SERVER(state->inode); 1667 struct nfs4_opendata *opendata; 1668 int err; 1669 1670 opendata = nfs4_open_recoverdata_alloc(ctx, state, 1671 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 1672 if (IS_ERR(opendata)) 1673 return PTR_ERR(opendata); 1674 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 1675 err = nfs4_open_recover(opendata, state); 1676 nfs4_opendata_put(opendata); 1677 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 1678 } 1679 1680 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 1681 { 1682 struct nfs4_opendata *data = calldata; 1683 1684 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args, 1685 &data->c_res.seq_res, task); 1686 } 1687 1688 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 1689 { 1690 struct nfs4_opendata *data = calldata; 1691 1692 nfs40_sequence_done(task, &data->c_res.seq_res); 1693 1694 data->rpc_status = task->tk_status; 1695 if (data->rpc_status == 0) { 1696 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 1697 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1698 renew_lease(data->o_res.server, data->timestamp); 1699 data->rpc_done = 1; 1700 } 1701 } 1702 1703 static void nfs4_open_confirm_release(void *calldata) 1704 { 1705 struct nfs4_opendata *data = calldata; 1706 struct nfs4_state *state = NULL; 1707 1708 /* If this request hasn't been cancelled, do nothing */ 1709 if (data->cancelled == 0) 1710 goto out_free; 1711 /* In case of error, no cleanup! */ 1712 if (!data->rpc_done) 1713 goto out_free; 1714 state = nfs4_opendata_to_nfs4_state(data); 1715 if (!IS_ERR(state)) 1716 nfs4_close_state(state, data->o_arg.fmode); 1717 out_free: 1718 nfs4_opendata_put(data); 1719 } 1720 1721 static const struct rpc_call_ops nfs4_open_confirm_ops = { 1722 .rpc_call_prepare = nfs4_open_confirm_prepare, 1723 .rpc_call_done = nfs4_open_confirm_done, 1724 .rpc_release = nfs4_open_confirm_release, 1725 }; 1726 1727 /* 1728 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 1729 */ 1730 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 1731 { 1732 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 1733 struct rpc_task *task; 1734 struct rpc_message msg = { 1735 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 1736 .rpc_argp = &data->c_arg, 1737 .rpc_resp = &data->c_res, 1738 .rpc_cred = data->owner->so_cred, 1739 }; 1740 struct rpc_task_setup task_setup_data = { 1741 .rpc_client = server->client, 1742 .rpc_message = &msg, 1743 .callback_ops = &nfs4_open_confirm_ops, 1744 .callback_data = data, 1745 .workqueue = nfsiod_workqueue, 1746 .flags = RPC_TASK_ASYNC, 1747 }; 1748 int status; 1749 1750 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); 1751 kref_get(&data->kref); 1752 data->rpc_done = 0; 1753 data->rpc_status = 0; 1754 data->timestamp = jiffies; 1755 task = rpc_run_task(&task_setup_data); 1756 if (IS_ERR(task)) 1757 return PTR_ERR(task); 1758 status = nfs4_wait_for_completion_rpc_task(task); 1759 if (status != 0) { 1760 data->cancelled = 1; 1761 smp_wmb(); 1762 } else 1763 status = data->rpc_status; 1764 rpc_put_task(task); 1765 return status; 1766 } 1767 1768 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 1769 { 1770 struct nfs4_opendata *data = calldata; 1771 struct nfs4_state_owner *sp = data->owner; 1772 struct nfs_client *clp = sp->so_server->nfs_client; 1773 1774 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 1775 goto out_wait; 1776 /* 1777 * Check if we still need to send an OPEN call, or if we can use 1778 * a delegation instead. 1779 */ 1780 if (data->state != NULL) { 1781 struct nfs_delegation *delegation; 1782 1783 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 1784 goto out_no_action; 1785 rcu_read_lock(); 1786 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 1787 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR && 1788 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH && 1789 can_open_delegated(delegation, data->o_arg.fmode)) 1790 goto unlock_no_action; 1791 rcu_read_unlock(); 1792 } 1793 /* Update client id. */ 1794 data->o_arg.clientid = clp->cl_clientid; 1795 switch (data->o_arg.claim) { 1796 case NFS4_OPEN_CLAIM_PREVIOUS: 1797 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1798 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1799 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 1800 case NFS4_OPEN_CLAIM_FH: 1801 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 1802 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 1803 } 1804 data->timestamp = jiffies; 1805 if (nfs4_setup_sequence(data->o_arg.server, 1806 &data->o_arg.seq_args, 1807 &data->o_res.seq_res, 1808 task) != 0) 1809 nfs_release_seqid(data->o_arg.seqid); 1810 1811 /* Set the create mode (note dependency on the session type) */ 1812 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 1813 if (data->o_arg.open_flags & O_EXCL) { 1814 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 1815 if (nfs4_has_persistent_session(clp)) 1816 data->o_arg.createmode = NFS4_CREATE_GUARDED; 1817 else if (clp->cl_mvops->minor_version > 0) 1818 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 1819 } 1820 return; 1821 unlock_no_action: 1822 rcu_read_unlock(); 1823 out_no_action: 1824 task->tk_action = NULL; 1825 out_wait: 1826 nfs4_sequence_done(task, &data->o_res.seq_res); 1827 } 1828 1829 static void nfs4_open_done(struct rpc_task *task, void *calldata) 1830 { 1831 struct nfs4_opendata *data = calldata; 1832 1833 data->rpc_status = task->tk_status; 1834 1835 if (!nfs4_sequence_done(task, &data->o_res.seq_res)) 1836 return; 1837 1838 if (task->tk_status == 0) { 1839 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 1840 switch (data->o_res.f_attr->mode & S_IFMT) { 1841 case S_IFREG: 1842 break; 1843 case S_IFLNK: 1844 data->rpc_status = -ELOOP; 1845 break; 1846 case S_IFDIR: 1847 data->rpc_status = -EISDIR; 1848 break; 1849 default: 1850 data->rpc_status = -ENOTDIR; 1851 } 1852 } 1853 renew_lease(data->o_res.server, data->timestamp); 1854 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 1855 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1856 } 1857 data->rpc_done = 1; 1858 } 1859 1860 static void nfs4_open_release(void *calldata) 1861 { 1862 struct nfs4_opendata *data = calldata; 1863 struct nfs4_state *state = NULL; 1864 1865 /* If this request hasn't been cancelled, do nothing */ 1866 if (data->cancelled == 0) 1867 goto out_free; 1868 /* In case of error, no cleanup! */ 1869 if (data->rpc_status != 0 || !data->rpc_done) 1870 goto out_free; 1871 /* In case we need an open_confirm, no cleanup! */ 1872 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 1873 goto out_free; 1874 state = nfs4_opendata_to_nfs4_state(data); 1875 if (!IS_ERR(state)) 1876 nfs4_close_state(state, data->o_arg.fmode); 1877 out_free: 1878 nfs4_opendata_put(data); 1879 } 1880 1881 static const struct rpc_call_ops nfs4_open_ops = { 1882 .rpc_call_prepare = nfs4_open_prepare, 1883 .rpc_call_done = nfs4_open_done, 1884 .rpc_release = nfs4_open_release, 1885 }; 1886 1887 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 1888 { 1889 struct inode *dir = data->dir->d_inode; 1890 struct nfs_server *server = NFS_SERVER(dir); 1891 struct nfs_openargs *o_arg = &data->o_arg; 1892 struct nfs_openres *o_res = &data->o_res; 1893 struct rpc_task *task; 1894 struct rpc_message msg = { 1895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 1896 .rpc_argp = o_arg, 1897 .rpc_resp = o_res, 1898 .rpc_cred = data->owner->so_cred, 1899 }; 1900 struct rpc_task_setup task_setup_data = { 1901 .rpc_client = server->client, 1902 .rpc_message = &msg, 1903 .callback_ops = &nfs4_open_ops, 1904 .callback_data = data, 1905 .workqueue = nfsiod_workqueue, 1906 .flags = RPC_TASK_ASYNC, 1907 }; 1908 int status; 1909 1910 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 1911 kref_get(&data->kref); 1912 data->rpc_done = 0; 1913 data->rpc_status = 0; 1914 data->cancelled = 0; 1915 data->is_recover = 0; 1916 if (isrecover) { 1917 nfs4_set_sequence_privileged(&o_arg->seq_args); 1918 data->is_recover = 1; 1919 } 1920 task = rpc_run_task(&task_setup_data); 1921 if (IS_ERR(task)) 1922 return PTR_ERR(task); 1923 status = nfs4_wait_for_completion_rpc_task(task); 1924 if (status != 0) { 1925 data->cancelled = 1; 1926 smp_wmb(); 1927 } else 1928 status = data->rpc_status; 1929 rpc_put_task(task); 1930 1931 return status; 1932 } 1933 1934 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 1935 { 1936 struct inode *dir = data->dir->d_inode; 1937 struct nfs_openres *o_res = &data->o_res; 1938 int status; 1939 1940 status = nfs4_run_open_task(data, 1); 1941 if (status != 0 || !data->rpc_done) 1942 return status; 1943 1944 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 1945 1946 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 1947 status = _nfs4_proc_open_confirm(data); 1948 if (status != 0) 1949 return status; 1950 } 1951 1952 return status; 1953 } 1954 1955 /* 1956 * Additional permission checks in order to distinguish between an 1957 * open for read, and an open for execute. This works around the 1958 * fact that NFSv4 OPEN treats read and execute permissions as being 1959 * the same. 1960 * Note that in the non-execute case, we want to turn off permission 1961 * checking if we just created a new file (POSIX open() semantics). 1962 */ 1963 static int nfs4_opendata_access(struct rpc_cred *cred, 1964 struct nfs4_opendata *opendata, 1965 struct nfs4_state *state, fmode_t fmode, 1966 int openflags) 1967 { 1968 struct nfs_access_entry cache; 1969 u32 mask; 1970 1971 /* access call failed or for some reason the server doesn't 1972 * support any access modes -- defer access call until later */ 1973 if (opendata->o_res.access_supported == 0) 1974 return 0; 1975 1976 mask = 0; 1977 /* 1978 * Use openflags to check for exec, because fmode won't 1979 * always have FMODE_EXEC set when file open for exec. 1980 */ 1981 if (openflags & __FMODE_EXEC) { 1982 /* ONLY check for exec rights */ 1983 mask = MAY_EXEC; 1984 } else if ((fmode & FMODE_READ) && !opendata->file_created) 1985 mask = MAY_READ; 1986 1987 cache.cred = cred; 1988 cache.jiffies = jiffies; 1989 nfs_access_set_mask(&cache, opendata->o_res.access_result); 1990 nfs_access_add_cache(state->inode, &cache); 1991 1992 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 1993 return 0; 1994 1995 /* even though OPEN succeeded, access is denied. Close the file */ 1996 nfs4_close_state(state, fmode); 1997 return -EACCES; 1998 } 1999 2000 /* 2001 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2002 */ 2003 static int _nfs4_proc_open(struct nfs4_opendata *data) 2004 { 2005 struct inode *dir = data->dir->d_inode; 2006 struct nfs_server *server = NFS_SERVER(dir); 2007 struct nfs_openargs *o_arg = &data->o_arg; 2008 struct nfs_openres *o_res = &data->o_res; 2009 int status; 2010 2011 status = nfs4_run_open_task(data, 0); 2012 if (!data->rpc_done) 2013 return status; 2014 if (status != 0) { 2015 if (status == -NFS4ERR_BADNAME && 2016 !(o_arg->open_flags & O_CREAT)) 2017 return -ENOENT; 2018 return status; 2019 } 2020 2021 nfs_fattr_map_and_free_names(server, &data->f_attr); 2022 2023 if (o_arg->open_flags & O_CREAT) { 2024 update_changeattr(dir, &o_res->cinfo); 2025 if (o_arg->open_flags & O_EXCL) 2026 data->file_created = 1; 2027 else if (o_res->cinfo.before != o_res->cinfo.after) 2028 data->file_created = 1; 2029 } 2030 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2031 server->caps &= ~NFS_CAP_POSIX_LOCK; 2032 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2033 status = _nfs4_proc_open_confirm(data); 2034 if (status != 0) 2035 return status; 2036 } 2037 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 2038 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2039 return 0; 2040 } 2041 2042 static int nfs4_recover_expired_lease(struct nfs_server *server) 2043 { 2044 return nfs4_client_recover_expired_lease(server->nfs_client); 2045 } 2046 2047 /* 2048 * OPEN_EXPIRED: 2049 * reclaim state on the server after a network partition. 2050 * Assumes caller holds the appropriate lock 2051 */ 2052 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2053 { 2054 struct nfs4_opendata *opendata; 2055 int ret; 2056 2057 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2058 NFS4_OPEN_CLAIM_FH); 2059 if (IS_ERR(opendata)) 2060 return PTR_ERR(opendata); 2061 ret = nfs4_open_recover(opendata, state); 2062 if (ret == -ESTALE) 2063 d_drop(ctx->dentry); 2064 nfs4_opendata_put(opendata); 2065 return ret; 2066 } 2067 2068 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2069 { 2070 struct nfs_server *server = NFS_SERVER(state->inode); 2071 struct nfs4_exception exception = { }; 2072 int err; 2073 2074 do { 2075 err = _nfs4_open_expired(ctx, state); 2076 trace_nfs4_open_expired(ctx, 0, err); 2077 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2078 continue; 2079 switch (err) { 2080 default: 2081 goto out; 2082 case -NFS4ERR_GRACE: 2083 case -NFS4ERR_DELAY: 2084 nfs4_handle_exception(server, err, &exception); 2085 err = 0; 2086 } 2087 } while (exception.retry); 2088 out: 2089 return err; 2090 } 2091 2092 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2093 { 2094 struct nfs_open_context *ctx; 2095 int ret; 2096 2097 ctx = nfs4_state_find_open_context(state); 2098 if (IS_ERR(ctx)) 2099 return -EAGAIN; 2100 ret = nfs4_do_open_expired(ctx, state); 2101 put_nfs_open_context(ctx); 2102 return ret; 2103 } 2104 2105 #if defined(CONFIG_NFS_V4_1) 2106 static void nfs41_clear_delegation_stateid(struct nfs4_state *state) 2107 { 2108 struct nfs_server *server = NFS_SERVER(state->inode); 2109 nfs4_stateid *stateid = &state->stateid; 2110 struct nfs_delegation *delegation; 2111 struct rpc_cred *cred = NULL; 2112 int status = -NFS4ERR_BAD_STATEID; 2113 2114 /* If a state reset has been done, test_stateid is unneeded */ 2115 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2116 return; 2117 2118 /* Get the delegation credential for use by test/free_stateid */ 2119 rcu_read_lock(); 2120 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2121 if (delegation != NULL && 2122 nfs4_stateid_match(&delegation->stateid, stateid)) { 2123 cred = get_rpccred(delegation->cred); 2124 rcu_read_unlock(); 2125 status = nfs41_test_stateid(server, stateid, cred); 2126 trace_nfs4_test_delegation_stateid(state, NULL, status); 2127 } else 2128 rcu_read_unlock(); 2129 2130 if (status != NFS_OK) { 2131 /* Free the stateid unless the server explicitly 2132 * informs us the stateid is unrecognized. */ 2133 if (status != -NFS4ERR_BAD_STATEID) 2134 nfs41_free_stateid(server, stateid, cred); 2135 nfs_remove_bad_delegation(state->inode); 2136 2137 write_seqlock(&state->seqlock); 2138 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2139 write_sequnlock(&state->seqlock); 2140 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2141 } 2142 2143 if (cred != NULL) 2144 put_rpccred(cred); 2145 } 2146 2147 /** 2148 * nfs41_check_open_stateid - possibly free an open stateid 2149 * 2150 * @state: NFSv4 state for an inode 2151 * 2152 * Returns NFS_OK if recovery for this stateid is now finished. 2153 * Otherwise a negative NFS4ERR value is returned. 2154 */ 2155 static int nfs41_check_open_stateid(struct nfs4_state *state) 2156 { 2157 struct nfs_server *server = NFS_SERVER(state->inode); 2158 nfs4_stateid *stateid = &state->open_stateid; 2159 struct rpc_cred *cred = state->owner->so_cred; 2160 int status; 2161 2162 /* If a state reset has been done, test_stateid is unneeded */ 2163 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 2164 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 2165 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 2166 return -NFS4ERR_BAD_STATEID; 2167 2168 status = nfs41_test_stateid(server, stateid, cred); 2169 trace_nfs4_test_open_stateid(state, NULL, status); 2170 if (status != NFS_OK) { 2171 /* Free the stateid unless the server explicitly 2172 * informs us the stateid is unrecognized. */ 2173 if (status != -NFS4ERR_BAD_STATEID) 2174 nfs41_free_stateid(server, stateid, cred); 2175 2176 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2177 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2178 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2179 clear_bit(NFS_OPEN_STATE, &state->flags); 2180 } 2181 return status; 2182 } 2183 2184 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2185 { 2186 int status; 2187 2188 nfs41_clear_delegation_stateid(state); 2189 status = nfs41_check_open_stateid(state); 2190 if (status != NFS_OK) 2191 status = nfs4_open_expired(sp, state); 2192 return status; 2193 } 2194 #endif 2195 2196 /* 2197 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2198 * fields corresponding to attributes that were used to store the verifier. 2199 * Make sure we clobber those fields in the later setattr call 2200 */ 2201 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 2202 { 2203 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2204 !(sattr->ia_valid & ATTR_ATIME_SET)) 2205 sattr->ia_valid |= ATTR_ATIME; 2206 2207 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2208 !(sattr->ia_valid & ATTR_MTIME_SET)) 2209 sattr->ia_valid |= ATTR_MTIME; 2210 } 2211 2212 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2213 fmode_t fmode, 2214 int flags, 2215 struct nfs_open_context *ctx) 2216 { 2217 struct nfs4_state_owner *sp = opendata->owner; 2218 struct nfs_server *server = sp->so_server; 2219 struct dentry *dentry; 2220 struct nfs4_state *state; 2221 unsigned int seq; 2222 int ret; 2223 2224 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2225 2226 ret = _nfs4_proc_open(opendata); 2227 if (ret != 0) { 2228 if (ret == -ENOENT) { 2229 d_drop(opendata->dentry); 2230 d_add(opendata->dentry, NULL); 2231 nfs_set_verifier(opendata->dentry, 2232 nfs_save_change_attribute(opendata->dir->d_inode)); 2233 } 2234 goto out; 2235 } 2236 2237 state = nfs4_opendata_to_nfs4_state(opendata); 2238 ret = PTR_ERR(state); 2239 if (IS_ERR(state)) 2240 goto out; 2241 if (server->caps & NFS_CAP_POSIX_LOCK) 2242 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2243 2244 dentry = opendata->dentry; 2245 if (dentry->d_inode == NULL) { 2246 /* FIXME: Is this d_drop() ever needed? */ 2247 d_drop(dentry); 2248 dentry = d_add_unique(dentry, igrab(state->inode)); 2249 if (dentry == NULL) { 2250 dentry = opendata->dentry; 2251 } else if (dentry != ctx->dentry) { 2252 dput(ctx->dentry); 2253 ctx->dentry = dget(dentry); 2254 } 2255 nfs_set_verifier(dentry, 2256 nfs_save_change_attribute(opendata->dir->d_inode)); 2257 } 2258 2259 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2260 if (ret != 0) 2261 goto out; 2262 2263 ctx->state = state; 2264 if (dentry->d_inode == state->inode) { 2265 nfs_inode_attach_open_context(ctx); 2266 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2267 nfs4_schedule_stateid_recovery(server, state); 2268 } 2269 out: 2270 return ret; 2271 } 2272 2273 /* 2274 * Returns a referenced nfs4_state 2275 */ 2276 static int _nfs4_do_open(struct inode *dir, 2277 struct nfs_open_context *ctx, 2278 int flags, 2279 struct iattr *sattr, 2280 struct nfs4_label *label, 2281 int *opened) 2282 { 2283 struct nfs4_state_owner *sp; 2284 struct nfs4_state *state = NULL; 2285 struct nfs_server *server = NFS_SERVER(dir); 2286 struct nfs4_opendata *opendata; 2287 struct dentry *dentry = ctx->dentry; 2288 struct rpc_cred *cred = ctx->cred; 2289 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2290 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2291 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2292 struct nfs4_label *olabel = NULL; 2293 int status; 2294 2295 /* Protect against reboot recovery conflicts */ 2296 status = -ENOMEM; 2297 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2298 if (sp == NULL) { 2299 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2300 goto out_err; 2301 } 2302 status = nfs4_recover_expired_lease(server); 2303 if (status != 0) 2304 goto err_put_state_owner; 2305 if (dentry->d_inode != NULL) 2306 nfs4_return_incompatible_delegation(dentry->d_inode, fmode); 2307 status = -ENOMEM; 2308 if (dentry->d_inode) 2309 claim = NFS4_OPEN_CLAIM_FH; 2310 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, 2311 label, claim, GFP_KERNEL); 2312 if (opendata == NULL) 2313 goto err_put_state_owner; 2314 2315 if (label) { 2316 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2317 if (IS_ERR(olabel)) { 2318 status = PTR_ERR(olabel); 2319 goto err_opendata_put; 2320 } 2321 } 2322 2323 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2324 if (!opendata->f_attr.mdsthreshold) { 2325 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2326 if (!opendata->f_attr.mdsthreshold) 2327 goto err_free_label; 2328 } 2329 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2330 } 2331 if (dentry->d_inode != NULL) 2332 opendata->state = nfs4_get_open_state(dentry->d_inode, sp); 2333 2334 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2335 if (status != 0) 2336 goto err_free_label; 2337 state = ctx->state; 2338 2339 if ((opendata->o_arg.open_flags & O_EXCL) && 2340 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2341 nfs4_exclusive_attrset(opendata, sattr); 2342 2343 nfs_fattr_init(opendata->o_res.f_attr); 2344 status = nfs4_do_setattr(state->inode, cred, 2345 opendata->o_res.f_attr, sattr, 2346 state, label, olabel); 2347 if (status == 0) { 2348 nfs_setattr_update_inode(state->inode, sattr); 2349 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr); 2350 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2351 } 2352 } 2353 if (opendata->file_created) 2354 *opened |= FILE_CREATED; 2355 2356 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2357 *ctx_th = opendata->f_attr.mdsthreshold; 2358 opendata->f_attr.mdsthreshold = NULL; 2359 } 2360 2361 nfs4_label_free(olabel); 2362 2363 nfs4_opendata_put(opendata); 2364 nfs4_put_state_owner(sp); 2365 return 0; 2366 err_free_label: 2367 nfs4_label_free(olabel); 2368 err_opendata_put: 2369 nfs4_opendata_put(opendata); 2370 err_put_state_owner: 2371 nfs4_put_state_owner(sp); 2372 out_err: 2373 return status; 2374 } 2375 2376 2377 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2378 struct nfs_open_context *ctx, 2379 int flags, 2380 struct iattr *sattr, 2381 struct nfs4_label *label, 2382 int *opened) 2383 { 2384 struct nfs_server *server = NFS_SERVER(dir); 2385 struct nfs4_exception exception = { }; 2386 struct nfs4_state *res; 2387 int status; 2388 2389 do { 2390 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened); 2391 res = ctx->state; 2392 trace_nfs4_open_file(ctx, flags, status); 2393 if (status == 0) 2394 break; 2395 /* NOTE: BAD_SEQID means the server and client disagree about the 2396 * book-keeping w.r.t. state-changing operations 2397 * (OPEN/CLOSE/LOCK/LOCKU...) 2398 * It is actually a sign of a bug on the client or on the server. 2399 * 2400 * If we receive a BAD_SEQID error in the particular case of 2401 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2402 * have unhashed the old state_owner for us, and that we can 2403 * therefore safely retry using a new one. We should still warn 2404 * the user though... 2405 */ 2406 if (status == -NFS4ERR_BAD_SEQID) { 2407 pr_warn_ratelimited("NFS: v4 server %s " 2408 " returned a bad sequence-id error!\n", 2409 NFS_SERVER(dir)->nfs_client->cl_hostname); 2410 exception.retry = 1; 2411 continue; 2412 } 2413 /* 2414 * BAD_STATEID on OPEN means that the server cancelled our 2415 * state before it received the OPEN_CONFIRM. 2416 * Recover by retrying the request as per the discussion 2417 * on Page 181 of RFC3530. 2418 */ 2419 if (status == -NFS4ERR_BAD_STATEID) { 2420 exception.retry = 1; 2421 continue; 2422 } 2423 if (status == -EAGAIN) { 2424 /* We must have found a delegation */ 2425 exception.retry = 1; 2426 continue; 2427 } 2428 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2429 continue; 2430 res = ERR_PTR(nfs4_handle_exception(server, 2431 status, &exception)); 2432 } while (exception.retry); 2433 return res; 2434 } 2435 2436 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2437 struct nfs_fattr *fattr, struct iattr *sattr, 2438 struct nfs4_state *state, struct nfs4_label *ilabel, 2439 struct nfs4_label *olabel) 2440 { 2441 struct nfs_server *server = NFS_SERVER(inode); 2442 struct nfs_setattrargs arg = { 2443 .fh = NFS_FH(inode), 2444 .iap = sattr, 2445 .server = server, 2446 .bitmask = server->attr_bitmask, 2447 .label = ilabel, 2448 }; 2449 struct nfs_setattrres res = { 2450 .fattr = fattr, 2451 .label = olabel, 2452 .server = server, 2453 }; 2454 struct rpc_message msg = { 2455 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2456 .rpc_argp = &arg, 2457 .rpc_resp = &res, 2458 .rpc_cred = cred, 2459 }; 2460 unsigned long timestamp = jiffies; 2461 fmode_t fmode; 2462 bool truncate; 2463 int status; 2464 2465 arg.bitmask = nfs4_bitmask(server, ilabel); 2466 if (ilabel) 2467 arg.bitmask = nfs4_bitmask(server, olabel); 2468 2469 nfs_fattr_init(fattr); 2470 2471 /* Servers should only apply open mode checks for file size changes */ 2472 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false; 2473 fmode = truncate ? FMODE_WRITE : FMODE_READ; 2474 2475 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) { 2476 /* Use that stateid */ 2477 } else if (truncate && state != NULL) { 2478 struct nfs_lockowner lockowner = { 2479 .l_owner = current->files, 2480 .l_pid = current->tgid, 2481 }; 2482 if (!nfs4_valid_open_stateid(state)) 2483 return -EBADF; 2484 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE, 2485 &lockowner) == -EIO) 2486 return -EBADF; 2487 } else 2488 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 2489 2490 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 2491 if (status == 0 && state != NULL) 2492 renew_lease(server, timestamp); 2493 return status; 2494 } 2495 2496 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2497 struct nfs_fattr *fattr, struct iattr *sattr, 2498 struct nfs4_state *state, struct nfs4_label *ilabel, 2499 struct nfs4_label *olabel) 2500 { 2501 struct nfs_server *server = NFS_SERVER(inode); 2502 struct nfs4_exception exception = { 2503 .state = state, 2504 .inode = inode, 2505 }; 2506 int err; 2507 do { 2508 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel); 2509 trace_nfs4_setattr(inode, err); 2510 switch (err) { 2511 case -NFS4ERR_OPENMODE: 2512 if (!(sattr->ia_valid & ATTR_SIZE)) { 2513 pr_warn_once("NFSv4: server %s is incorrectly " 2514 "applying open mode checks to " 2515 "a SETATTR that is not " 2516 "changing file size.\n", 2517 server->nfs_client->cl_hostname); 2518 } 2519 if (state && !(state->state & FMODE_WRITE)) { 2520 err = -EBADF; 2521 if (sattr->ia_valid & ATTR_OPEN) 2522 err = -EACCES; 2523 goto out; 2524 } 2525 } 2526 err = nfs4_handle_exception(server, err, &exception); 2527 } while (exception.retry); 2528 out: 2529 return err; 2530 } 2531 2532 struct nfs4_closedata { 2533 struct inode *inode; 2534 struct nfs4_state *state; 2535 struct nfs_closeargs arg; 2536 struct nfs_closeres res; 2537 struct nfs_fattr fattr; 2538 unsigned long timestamp; 2539 bool roc; 2540 u32 roc_barrier; 2541 }; 2542 2543 static void nfs4_free_closedata(void *data) 2544 { 2545 struct nfs4_closedata *calldata = data; 2546 struct nfs4_state_owner *sp = calldata->state->owner; 2547 struct super_block *sb = calldata->state->inode->i_sb; 2548 2549 if (calldata->roc) 2550 pnfs_roc_release(calldata->state->inode); 2551 nfs4_put_open_state(calldata->state); 2552 nfs_free_seqid(calldata->arg.seqid); 2553 nfs4_put_state_owner(sp); 2554 nfs_sb_deactive(sb); 2555 kfree(calldata); 2556 } 2557 2558 static void nfs4_close_done(struct rpc_task *task, void *data) 2559 { 2560 struct nfs4_closedata *calldata = data; 2561 struct nfs4_state *state = calldata->state; 2562 struct nfs_server *server = NFS_SERVER(calldata->inode); 2563 2564 dprintk("%s: begin!\n", __func__); 2565 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2566 return; 2567 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 2568 /* hmm. we are done with the inode, and in the process of freeing 2569 * the state_owner. we keep this around to process errors 2570 */ 2571 switch (task->tk_status) { 2572 case 0: 2573 if (calldata->roc) 2574 pnfs_roc_set_barrier(state->inode, 2575 calldata->roc_barrier); 2576 nfs_clear_open_stateid(state, &calldata->res.stateid, 0); 2577 renew_lease(server, calldata->timestamp); 2578 goto out_release; 2579 case -NFS4ERR_ADMIN_REVOKED: 2580 case -NFS4ERR_STALE_STATEID: 2581 case -NFS4ERR_OLD_STATEID: 2582 case -NFS4ERR_BAD_STATEID: 2583 case -NFS4ERR_EXPIRED: 2584 if (calldata->arg.fmode == 0) 2585 break; 2586 default: 2587 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) { 2588 rpc_restart_call_prepare(task); 2589 goto out_release; 2590 } 2591 } 2592 nfs_clear_open_stateid(state, NULL, calldata->arg.fmode); 2593 out_release: 2594 nfs_release_seqid(calldata->arg.seqid); 2595 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2596 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2597 } 2598 2599 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2600 { 2601 struct nfs4_closedata *calldata = data; 2602 struct nfs4_state *state = calldata->state; 2603 struct inode *inode = calldata->inode; 2604 int call_close = 0; 2605 2606 dprintk("%s: begin!\n", __func__); 2607 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2608 goto out_wait; 2609 2610 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2611 calldata->arg.fmode = FMODE_READ|FMODE_WRITE; 2612 spin_lock(&state->owner->so_lock); 2613 /* Calculate the change in open mode */ 2614 if (state->n_rdwr == 0) { 2615 if (state->n_rdonly == 0) { 2616 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); 2617 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2618 calldata->arg.fmode &= ~FMODE_READ; 2619 } 2620 if (state->n_wronly == 0) { 2621 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); 2622 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2623 calldata->arg.fmode &= ~FMODE_WRITE; 2624 } 2625 } 2626 if (!nfs4_valid_open_stateid(state)) 2627 call_close = 0; 2628 spin_unlock(&state->owner->so_lock); 2629 2630 if (!call_close) { 2631 /* Note: exit _without_ calling nfs4_close_done */ 2632 goto out_no_action; 2633 } 2634 2635 if (calldata->arg.fmode == 0) { 2636 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2637 if (calldata->roc && 2638 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) { 2639 nfs_release_seqid(calldata->arg.seqid); 2640 goto out_wait; 2641 } 2642 } 2643 2644 nfs_fattr_init(calldata->res.fattr); 2645 calldata->timestamp = jiffies; 2646 if (nfs4_setup_sequence(NFS_SERVER(inode), 2647 &calldata->arg.seq_args, 2648 &calldata->res.seq_res, 2649 task) != 0) 2650 nfs_release_seqid(calldata->arg.seqid); 2651 dprintk("%s: done!\n", __func__); 2652 return; 2653 out_no_action: 2654 task->tk_action = NULL; 2655 out_wait: 2656 nfs4_sequence_done(task, &calldata->res.seq_res); 2657 } 2658 2659 static const struct rpc_call_ops nfs4_close_ops = { 2660 .rpc_call_prepare = nfs4_close_prepare, 2661 .rpc_call_done = nfs4_close_done, 2662 .rpc_release = nfs4_free_closedata, 2663 }; 2664 2665 static bool nfs4_state_has_opener(struct nfs4_state *state) 2666 { 2667 /* first check existing openers */ 2668 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 && 2669 state->n_rdonly != 0) 2670 return true; 2671 2672 if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 && 2673 state->n_wronly != 0) 2674 return true; 2675 2676 if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 && 2677 state->n_rdwr != 0) 2678 return true; 2679 2680 return false; 2681 } 2682 2683 static bool nfs4_roc(struct inode *inode) 2684 { 2685 struct nfs_inode *nfsi = NFS_I(inode); 2686 struct nfs_open_context *ctx; 2687 struct nfs4_state *state; 2688 2689 spin_lock(&inode->i_lock); 2690 list_for_each_entry(ctx, &nfsi->open_files, list) { 2691 state = ctx->state; 2692 if (state == NULL) 2693 continue; 2694 if (nfs4_state_has_opener(state)) { 2695 spin_unlock(&inode->i_lock); 2696 return false; 2697 } 2698 } 2699 spin_unlock(&inode->i_lock); 2700 2701 if (nfs4_check_delegation(inode, FMODE_READ)) 2702 return false; 2703 2704 return pnfs_roc(inode); 2705 } 2706 2707 /* 2708 * It is possible for data to be read/written from a mem-mapped file 2709 * after the sys_close call (which hits the vfs layer as a flush). 2710 * This means that we can't safely call nfsv4 close on a file until 2711 * the inode is cleared. This in turn means that we are not good 2712 * NFSv4 citizens - we do not indicate to the server to update the file's 2713 * share state even when we are done with one of the three share 2714 * stateid's in the inode. 2715 * 2716 * NOTE: Caller must be holding the sp->so_owner semaphore! 2717 */ 2718 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2719 { 2720 struct nfs_server *server = NFS_SERVER(state->inode); 2721 struct nfs4_closedata *calldata; 2722 struct nfs4_state_owner *sp = state->owner; 2723 struct rpc_task *task; 2724 struct rpc_message msg = { 2725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2726 .rpc_cred = state->owner->so_cred, 2727 }; 2728 struct rpc_task_setup task_setup_data = { 2729 .rpc_client = server->client, 2730 .rpc_message = &msg, 2731 .callback_ops = &nfs4_close_ops, 2732 .workqueue = nfsiod_workqueue, 2733 .flags = RPC_TASK_ASYNC, 2734 }; 2735 int status = -ENOMEM; 2736 2737 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 2738 &task_setup_data.rpc_client, &msg); 2739 2740 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2741 if (calldata == NULL) 2742 goto out; 2743 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2744 calldata->inode = state->inode; 2745 calldata->state = state; 2746 calldata->arg.fh = NFS_FH(state->inode); 2747 calldata->arg.stateid = &state->open_stateid; 2748 /* Serialization for the sequence id */ 2749 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask); 2750 if (calldata->arg.seqid == NULL) 2751 goto out_free_calldata; 2752 calldata->arg.fmode = 0; 2753 calldata->arg.bitmask = server->cache_consistency_bitmask; 2754 calldata->res.fattr = &calldata->fattr; 2755 calldata->res.seqid = calldata->arg.seqid; 2756 calldata->res.server = server; 2757 calldata->roc = nfs4_roc(state->inode); 2758 nfs_sb_active(calldata->inode->i_sb); 2759 2760 msg.rpc_argp = &calldata->arg; 2761 msg.rpc_resp = &calldata->res; 2762 task_setup_data.callback_data = calldata; 2763 task = rpc_run_task(&task_setup_data); 2764 if (IS_ERR(task)) 2765 return PTR_ERR(task); 2766 status = 0; 2767 if (wait) 2768 status = rpc_wait_for_completion_task(task); 2769 rpc_put_task(task); 2770 return status; 2771 out_free_calldata: 2772 kfree(calldata); 2773 out: 2774 nfs4_put_open_state(state); 2775 nfs4_put_state_owner(sp); 2776 return status; 2777 } 2778 2779 static struct inode * 2780 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 2781 int open_flags, struct iattr *attr, int *opened) 2782 { 2783 struct nfs4_state *state; 2784 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 2785 2786 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 2787 2788 /* Protect against concurrent sillydeletes */ 2789 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 2790 2791 nfs4_label_release_security(label); 2792 2793 if (IS_ERR(state)) 2794 return ERR_CAST(state); 2795 return state->inode; 2796 } 2797 2798 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 2799 { 2800 if (ctx->state == NULL) 2801 return; 2802 if (is_sync) 2803 nfs4_close_sync(ctx->state, ctx->mode); 2804 else 2805 nfs4_close_state(ctx->state, ctx->mode); 2806 } 2807 2808 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 2809 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 2810 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL) 2811 2812 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2813 { 2814 struct nfs4_server_caps_arg args = { 2815 .fhandle = fhandle, 2816 }; 2817 struct nfs4_server_caps_res res = {}; 2818 struct rpc_message msg = { 2819 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 2820 .rpc_argp = &args, 2821 .rpc_resp = &res, 2822 }; 2823 int status; 2824 2825 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2826 if (status == 0) { 2827 /* Sanity check the server answers */ 2828 switch (server->nfs_client->cl_minorversion) { 2829 case 0: 2830 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 2831 res.attr_bitmask[2] = 0; 2832 break; 2833 case 1: 2834 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 2835 break; 2836 case 2: 2837 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 2838 } 2839 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 2840 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 2841 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 2842 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 2843 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 2844 NFS_CAP_CTIME|NFS_CAP_MTIME| 2845 NFS_CAP_SECURITY_LABEL); 2846 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 2847 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 2848 server->caps |= NFS_CAP_ACLS; 2849 if (res.has_links != 0) 2850 server->caps |= NFS_CAP_HARDLINKS; 2851 if (res.has_symlinks != 0) 2852 server->caps |= NFS_CAP_SYMLINKS; 2853 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 2854 server->caps |= NFS_CAP_FILEID; 2855 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 2856 server->caps |= NFS_CAP_MODE; 2857 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 2858 server->caps |= NFS_CAP_NLINK; 2859 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 2860 server->caps |= NFS_CAP_OWNER; 2861 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 2862 server->caps |= NFS_CAP_OWNER_GROUP; 2863 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 2864 server->caps |= NFS_CAP_ATIME; 2865 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 2866 server->caps |= NFS_CAP_CTIME; 2867 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 2868 server->caps |= NFS_CAP_MTIME; 2869 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 2870 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 2871 server->caps |= NFS_CAP_SECURITY_LABEL; 2872 #endif 2873 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 2874 sizeof(server->attr_bitmask)); 2875 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2876 2877 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 2878 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 2879 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 2880 server->cache_consistency_bitmask[2] = 0; 2881 server->acl_bitmask = res.acl_bitmask; 2882 server->fh_expire_type = res.fh_expire_type; 2883 } 2884 2885 return status; 2886 } 2887 2888 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2889 { 2890 struct nfs4_exception exception = { }; 2891 int err; 2892 do { 2893 err = nfs4_handle_exception(server, 2894 _nfs4_server_capabilities(server, fhandle), 2895 &exception); 2896 } while (exception.retry); 2897 return err; 2898 } 2899 2900 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2901 struct nfs_fsinfo *info) 2902 { 2903 u32 bitmask[3]; 2904 struct nfs4_lookup_root_arg args = { 2905 .bitmask = bitmask, 2906 }; 2907 struct nfs4_lookup_res res = { 2908 .server = server, 2909 .fattr = info->fattr, 2910 .fh = fhandle, 2911 }; 2912 struct rpc_message msg = { 2913 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 2914 .rpc_argp = &args, 2915 .rpc_resp = &res, 2916 }; 2917 2918 bitmask[0] = nfs4_fattr_bitmap[0]; 2919 bitmask[1] = nfs4_fattr_bitmap[1]; 2920 /* 2921 * Process the label in the upcoming getfattr 2922 */ 2923 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 2924 2925 nfs_fattr_init(info->fattr); 2926 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2927 } 2928 2929 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2930 struct nfs_fsinfo *info) 2931 { 2932 struct nfs4_exception exception = { }; 2933 int err; 2934 do { 2935 err = _nfs4_lookup_root(server, fhandle, info); 2936 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 2937 switch (err) { 2938 case 0: 2939 case -NFS4ERR_WRONGSEC: 2940 goto out; 2941 default: 2942 err = nfs4_handle_exception(server, err, &exception); 2943 } 2944 } while (exception.retry); 2945 out: 2946 return err; 2947 } 2948 2949 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2950 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 2951 { 2952 struct rpc_auth_create_args auth_args = { 2953 .pseudoflavor = flavor, 2954 }; 2955 struct rpc_auth *auth; 2956 int ret; 2957 2958 auth = rpcauth_create(&auth_args, server->client); 2959 if (IS_ERR(auth)) { 2960 ret = -EACCES; 2961 goto out; 2962 } 2963 ret = nfs4_lookup_root(server, fhandle, info); 2964 out: 2965 return ret; 2966 } 2967 2968 /* 2969 * Retry pseudoroot lookup with various security flavors. We do this when: 2970 * 2971 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 2972 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 2973 * 2974 * Returns zero on success, or a negative NFS4ERR value, or a 2975 * negative errno value. 2976 */ 2977 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2978 struct nfs_fsinfo *info) 2979 { 2980 /* Per 3530bis 15.33.5 */ 2981 static const rpc_authflavor_t flav_array[] = { 2982 RPC_AUTH_GSS_KRB5P, 2983 RPC_AUTH_GSS_KRB5I, 2984 RPC_AUTH_GSS_KRB5, 2985 RPC_AUTH_UNIX, /* courtesy */ 2986 RPC_AUTH_NULL, 2987 }; 2988 int status = -EPERM; 2989 size_t i; 2990 2991 if (server->auth_info.flavor_len > 0) { 2992 /* try each flavor specified by user */ 2993 for (i = 0; i < server->auth_info.flavor_len; i++) { 2994 status = nfs4_lookup_root_sec(server, fhandle, info, 2995 server->auth_info.flavors[i]); 2996 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 2997 continue; 2998 break; 2999 } 3000 } else { 3001 /* no flavors specified by user, try default list */ 3002 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 3003 status = nfs4_lookup_root_sec(server, fhandle, info, 3004 flav_array[i]); 3005 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 3006 continue; 3007 break; 3008 } 3009 } 3010 3011 /* 3012 * -EACCESS could mean that the user doesn't have correct permissions 3013 * to access the mount. It could also mean that we tried to mount 3014 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 3015 * existing mount programs don't handle -EACCES very well so it should 3016 * be mapped to -EPERM instead. 3017 */ 3018 if (status == -EACCES) 3019 status = -EPERM; 3020 return status; 3021 } 3022 3023 static int nfs4_do_find_root_sec(struct nfs_server *server, 3024 struct nfs_fh *fhandle, struct nfs_fsinfo *info) 3025 { 3026 int mv = server->nfs_client->cl_minorversion; 3027 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info); 3028 } 3029 3030 /** 3031 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 3032 * @server: initialized nfs_server handle 3033 * @fhandle: we fill in the pseudo-fs root file handle 3034 * @info: we fill in an FSINFO struct 3035 * @auth_probe: probe the auth flavours 3036 * 3037 * Returns zero on success, or a negative errno. 3038 */ 3039 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 3040 struct nfs_fsinfo *info, 3041 bool auth_probe) 3042 { 3043 int status; 3044 3045 switch (auth_probe) { 3046 case false: 3047 status = nfs4_lookup_root(server, fhandle, info); 3048 if (status != -NFS4ERR_WRONGSEC) 3049 break; 3050 default: 3051 status = nfs4_do_find_root_sec(server, fhandle, info); 3052 } 3053 3054 if (status == 0) 3055 status = nfs4_server_capabilities(server, fhandle); 3056 if (status == 0) 3057 status = nfs4_do_fsinfo(server, fhandle, info); 3058 3059 return nfs4_map_errors(status); 3060 } 3061 3062 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3063 struct nfs_fsinfo *info) 3064 { 3065 int error; 3066 struct nfs_fattr *fattr = info->fattr; 3067 struct nfs4_label *label = NULL; 3068 3069 error = nfs4_server_capabilities(server, mntfh); 3070 if (error < 0) { 3071 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3072 return error; 3073 } 3074 3075 label = nfs4_label_alloc(server, GFP_KERNEL); 3076 if (IS_ERR(label)) 3077 return PTR_ERR(label); 3078 3079 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3080 if (error < 0) { 3081 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3082 goto err_free_label; 3083 } 3084 3085 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3086 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3087 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3088 3089 err_free_label: 3090 nfs4_label_free(label); 3091 3092 return error; 3093 } 3094 3095 /* 3096 * Get locations and (maybe) other attributes of a referral. 3097 * Note that we'll actually follow the referral later when 3098 * we detect fsid mismatch in inode revalidation 3099 */ 3100 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3101 const struct qstr *name, struct nfs_fattr *fattr, 3102 struct nfs_fh *fhandle) 3103 { 3104 int status = -ENOMEM; 3105 struct page *page = NULL; 3106 struct nfs4_fs_locations *locations = NULL; 3107 3108 page = alloc_page(GFP_KERNEL); 3109 if (page == NULL) 3110 goto out; 3111 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3112 if (locations == NULL) 3113 goto out; 3114 3115 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3116 if (status != 0) 3117 goto out; 3118 3119 /* 3120 * If the fsid didn't change, this is a migration event, not a 3121 * referral. Cause us to drop into the exception handler, which 3122 * will kick off migration recovery. 3123 */ 3124 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3125 dprintk("%s: server did not return a different fsid for" 3126 " a referral at %s\n", __func__, name->name); 3127 status = -NFS4ERR_MOVED; 3128 goto out; 3129 } 3130 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3131 nfs_fixup_referral_attributes(&locations->fattr); 3132 3133 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3134 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3135 memset(fhandle, 0, sizeof(struct nfs_fh)); 3136 out: 3137 if (page) 3138 __free_page(page); 3139 kfree(locations); 3140 return status; 3141 } 3142 3143 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3144 struct nfs_fattr *fattr, struct nfs4_label *label) 3145 { 3146 struct nfs4_getattr_arg args = { 3147 .fh = fhandle, 3148 .bitmask = server->attr_bitmask, 3149 }; 3150 struct nfs4_getattr_res res = { 3151 .fattr = fattr, 3152 .label = label, 3153 .server = server, 3154 }; 3155 struct rpc_message msg = { 3156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3157 .rpc_argp = &args, 3158 .rpc_resp = &res, 3159 }; 3160 3161 args.bitmask = nfs4_bitmask(server, label); 3162 3163 nfs_fattr_init(fattr); 3164 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3165 } 3166 3167 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3168 struct nfs_fattr *fattr, struct nfs4_label *label) 3169 { 3170 struct nfs4_exception exception = { }; 3171 int err; 3172 do { 3173 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3174 trace_nfs4_getattr(server, fhandle, fattr, err); 3175 err = nfs4_handle_exception(server, err, 3176 &exception); 3177 } while (exception.retry); 3178 return err; 3179 } 3180 3181 /* 3182 * The file is not closed if it is opened due to the a request to change 3183 * the size of the file. The open call will not be needed once the 3184 * VFS layer lookup-intents are implemented. 3185 * 3186 * Close is called when the inode is destroyed. 3187 * If we haven't opened the file for O_WRONLY, we 3188 * need to in the size_change case to obtain a stateid. 3189 * 3190 * Got race? 3191 * Because OPEN is always done by name in nfsv4, it is 3192 * possible that we opened a different file by the same 3193 * name. We can recognize this race condition, but we 3194 * can't do anything about it besides returning an error. 3195 * 3196 * This will be fixed with VFS changes (lookup-intent). 3197 */ 3198 static int 3199 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3200 struct iattr *sattr) 3201 { 3202 struct inode *inode = dentry->d_inode; 3203 struct rpc_cred *cred = NULL; 3204 struct nfs4_state *state = NULL; 3205 struct nfs4_label *label = NULL; 3206 int status; 3207 3208 if (pnfs_ld_layoutret_on_setattr(inode)) 3209 pnfs_commit_and_return_layout(inode); 3210 3211 nfs_fattr_init(fattr); 3212 3213 /* Deal with open(O_TRUNC) */ 3214 if (sattr->ia_valid & ATTR_OPEN) 3215 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3216 3217 /* Optimization: if the end result is no change, don't RPC */ 3218 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3219 return 0; 3220 3221 /* Search for an existing open(O_WRITE) file */ 3222 if (sattr->ia_valid & ATTR_FILE) { 3223 struct nfs_open_context *ctx; 3224 3225 ctx = nfs_file_open_context(sattr->ia_file); 3226 if (ctx) { 3227 cred = ctx->cred; 3228 state = ctx->state; 3229 } 3230 } 3231 3232 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3233 if (IS_ERR(label)) 3234 return PTR_ERR(label); 3235 3236 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label); 3237 if (status == 0) { 3238 nfs_setattr_update_inode(inode, sattr); 3239 nfs_setsecurity(inode, fattr, label); 3240 } 3241 nfs4_label_free(label); 3242 return status; 3243 } 3244 3245 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3246 const struct qstr *name, struct nfs_fh *fhandle, 3247 struct nfs_fattr *fattr, struct nfs4_label *label) 3248 { 3249 struct nfs_server *server = NFS_SERVER(dir); 3250 int status; 3251 struct nfs4_lookup_arg args = { 3252 .bitmask = server->attr_bitmask, 3253 .dir_fh = NFS_FH(dir), 3254 .name = name, 3255 }; 3256 struct nfs4_lookup_res res = { 3257 .server = server, 3258 .fattr = fattr, 3259 .label = label, 3260 .fh = fhandle, 3261 }; 3262 struct rpc_message msg = { 3263 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3264 .rpc_argp = &args, 3265 .rpc_resp = &res, 3266 }; 3267 3268 args.bitmask = nfs4_bitmask(server, label); 3269 3270 nfs_fattr_init(fattr); 3271 3272 dprintk("NFS call lookup %s\n", name->name); 3273 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3274 dprintk("NFS reply lookup: %d\n", status); 3275 return status; 3276 } 3277 3278 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3279 { 3280 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3281 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3282 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3283 fattr->nlink = 2; 3284 } 3285 3286 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3287 struct qstr *name, struct nfs_fh *fhandle, 3288 struct nfs_fattr *fattr, struct nfs4_label *label) 3289 { 3290 struct nfs4_exception exception = { }; 3291 struct rpc_clnt *client = *clnt; 3292 int err; 3293 do { 3294 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3295 trace_nfs4_lookup(dir, name, err); 3296 switch (err) { 3297 case -NFS4ERR_BADNAME: 3298 err = -ENOENT; 3299 goto out; 3300 case -NFS4ERR_MOVED: 3301 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3302 goto out; 3303 case -NFS4ERR_WRONGSEC: 3304 err = -EPERM; 3305 if (client != *clnt) 3306 goto out; 3307 client = nfs4_negotiate_security(client, dir, name); 3308 if (IS_ERR(client)) 3309 return PTR_ERR(client); 3310 3311 exception.retry = 1; 3312 break; 3313 default: 3314 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3315 } 3316 } while (exception.retry); 3317 3318 out: 3319 if (err == 0) 3320 *clnt = client; 3321 else if (client != *clnt) 3322 rpc_shutdown_client(client); 3323 3324 return err; 3325 } 3326 3327 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, 3328 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3329 struct nfs4_label *label) 3330 { 3331 int status; 3332 struct rpc_clnt *client = NFS_CLIENT(dir); 3333 3334 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3335 if (client != NFS_CLIENT(dir)) { 3336 rpc_shutdown_client(client); 3337 nfs_fixup_secinfo_attributes(fattr); 3338 } 3339 return status; 3340 } 3341 3342 struct rpc_clnt * 3343 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name, 3344 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3345 { 3346 struct rpc_clnt *client = NFS_CLIENT(dir); 3347 int status; 3348 3349 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3350 if (status < 0) 3351 return ERR_PTR(status); 3352 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3353 } 3354 3355 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3356 { 3357 struct nfs_server *server = NFS_SERVER(inode); 3358 struct nfs4_accessargs args = { 3359 .fh = NFS_FH(inode), 3360 .bitmask = server->cache_consistency_bitmask, 3361 }; 3362 struct nfs4_accessres res = { 3363 .server = server, 3364 }; 3365 struct rpc_message msg = { 3366 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 3367 .rpc_argp = &args, 3368 .rpc_resp = &res, 3369 .rpc_cred = entry->cred, 3370 }; 3371 int mode = entry->mask; 3372 int status = 0; 3373 3374 /* 3375 * Determine which access bits we want to ask for... 3376 */ 3377 if (mode & MAY_READ) 3378 args.access |= NFS4_ACCESS_READ; 3379 if (S_ISDIR(inode->i_mode)) { 3380 if (mode & MAY_WRITE) 3381 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 3382 if (mode & MAY_EXEC) 3383 args.access |= NFS4_ACCESS_LOOKUP; 3384 } else { 3385 if (mode & MAY_WRITE) 3386 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 3387 if (mode & MAY_EXEC) 3388 args.access |= NFS4_ACCESS_EXECUTE; 3389 } 3390 3391 res.fattr = nfs_alloc_fattr(); 3392 if (res.fattr == NULL) 3393 return -ENOMEM; 3394 3395 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3396 if (!status) { 3397 nfs_access_set_mask(entry, res.access); 3398 nfs_refresh_inode(inode, res.fattr); 3399 } 3400 nfs_free_fattr(res.fattr); 3401 return status; 3402 } 3403 3404 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3405 { 3406 struct nfs4_exception exception = { }; 3407 int err; 3408 do { 3409 err = _nfs4_proc_access(inode, entry); 3410 trace_nfs4_access(inode, err); 3411 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3412 &exception); 3413 } while (exception.retry); 3414 return err; 3415 } 3416 3417 /* 3418 * TODO: For the time being, we don't try to get any attributes 3419 * along with any of the zero-copy operations READ, READDIR, 3420 * READLINK, WRITE. 3421 * 3422 * In the case of the first three, we want to put the GETATTR 3423 * after the read-type operation -- this is because it is hard 3424 * to predict the length of a GETATTR response in v4, and thus 3425 * align the READ data correctly. This means that the GETATTR 3426 * may end up partially falling into the page cache, and we should 3427 * shift it into the 'tail' of the xdr_buf before processing. 3428 * To do this efficiently, we need to know the total length 3429 * of data received, which doesn't seem to be available outside 3430 * of the RPC layer. 3431 * 3432 * In the case of WRITE, we also want to put the GETATTR after 3433 * the operation -- in this case because we want to make sure 3434 * we get the post-operation mtime and size. 3435 * 3436 * Both of these changes to the XDR layer would in fact be quite 3437 * minor, but I decided to leave them for a subsequent patch. 3438 */ 3439 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 3440 unsigned int pgbase, unsigned int pglen) 3441 { 3442 struct nfs4_readlink args = { 3443 .fh = NFS_FH(inode), 3444 .pgbase = pgbase, 3445 .pglen = pglen, 3446 .pages = &page, 3447 }; 3448 struct nfs4_readlink_res res; 3449 struct rpc_message msg = { 3450 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 3451 .rpc_argp = &args, 3452 .rpc_resp = &res, 3453 }; 3454 3455 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 3456 } 3457 3458 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 3459 unsigned int pgbase, unsigned int pglen) 3460 { 3461 struct nfs4_exception exception = { }; 3462 int err; 3463 do { 3464 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 3465 trace_nfs4_readlink(inode, err); 3466 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3467 &exception); 3468 } while (exception.retry); 3469 return err; 3470 } 3471 3472 /* 3473 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 3474 */ 3475 static int 3476 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 3477 int flags) 3478 { 3479 struct nfs4_label l, *ilabel = NULL; 3480 struct nfs_open_context *ctx; 3481 struct nfs4_state *state; 3482 int opened = 0; 3483 int status = 0; 3484 3485 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 3486 if (IS_ERR(ctx)) 3487 return PTR_ERR(ctx); 3488 3489 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 3490 3491 sattr->ia_mode &= ~current_umask(); 3492 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened); 3493 if (IS_ERR(state)) { 3494 status = PTR_ERR(state); 3495 goto out; 3496 } 3497 out: 3498 nfs4_label_release_security(ilabel); 3499 put_nfs_open_context(ctx); 3500 return status; 3501 } 3502 3503 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 3504 { 3505 struct nfs_server *server = NFS_SERVER(dir); 3506 struct nfs_removeargs args = { 3507 .fh = NFS_FH(dir), 3508 .name = *name, 3509 }; 3510 struct nfs_removeres res = { 3511 .server = server, 3512 }; 3513 struct rpc_message msg = { 3514 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 3515 .rpc_argp = &args, 3516 .rpc_resp = &res, 3517 }; 3518 int status; 3519 3520 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 3521 if (status == 0) 3522 update_changeattr(dir, &res.cinfo); 3523 return status; 3524 } 3525 3526 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 3527 { 3528 struct nfs4_exception exception = { }; 3529 int err; 3530 do { 3531 err = _nfs4_proc_remove(dir, name); 3532 trace_nfs4_remove(dir, name, err); 3533 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3534 &exception); 3535 } while (exception.retry); 3536 return err; 3537 } 3538 3539 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 3540 { 3541 struct nfs_server *server = NFS_SERVER(dir); 3542 struct nfs_removeargs *args = msg->rpc_argp; 3543 struct nfs_removeres *res = msg->rpc_resp; 3544 3545 res->server = server; 3546 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 3547 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 3548 3549 nfs_fattr_init(res->dir_attr); 3550 } 3551 3552 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 3553 { 3554 nfs4_setup_sequence(NFS_SERVER(data->dir), 3555 &data->args.seq_args, 3556 &data->res.seq_res, 3557 task); 3558 } 3559 3560 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 3561 { 3562 struct nfs_unlinkdata *data = task->tk_calldata; 3563 struct nfs_removeres *res = &data->res; 3564 3565 if (!nfs4_sequence_done(task, &res->seq_res)) 3566 return 0; 3567 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 3568 return 0; 3569 update_changeattr(dir, &res->cinfo); 3570 return 1; 3571 } 3572 3573 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 3574 { 3575 struct nfs_server *server = NFS_SERVER(dir); 3576 struct nfs_renameargs *arg = msg->rpc_argp; 3577 struct nfs_renameres *res = msg->rpc_resp; 3578 3579 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 3580 res->server = server; 3581 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 3582 } 3583 3584 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 3585 { 3586 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 3587 &data->args.seq_args, 3588 &data->res.seq_res, 3589 task); 3590 } 3591 3592 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 3593 struct inode *new_dir) 3594 { 3595 struct nfs_renamedata *data = task->tk_calldata; 3596 struct nfs_renameres *res = &data->res; 3597 3598 if (!nfs4_sequence_done(task, &res->seq_res)) 3599 return 0; 3600 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 3601 return 0; 3602 3603 update_changeattr(old_dir, &res->old_cinfo); 3604 update_changeattr(new_dir, &res->new_cinfo); 3605 return 1; 3606 } 3607 3608 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3609 { 3610 struct nfs_server *server = NFS_SERVER(inode); 3611 struct nfs4_link_arg arg = { 3612 .fh = NFS_FH(inode), 3613 .dir_fh = NFS_FH(dir), 3614 .name = name, 3615 .bitmask = server->attr_bitmask, 3616 }; 3617 struct nfs4_link_res res = { 3618 .server = server, 3619 .label = NULL, 3620 }; 3621 struct rpc_message msg = { 3622 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3623 .rpc_argp = &arg, 3624 .rpc_resp = &res, 3625 }; 3626 int status = -ENOMEM; 3627 3628 res.fattr = nfs_alloc_fattr(); 3629 if (res.fattr == NULL) 3630 goto out; 3631 3632 res.label = nfs4_label_alloc(server, GFP_KERNEL); 3633 if (IS_ERR(res.label)) { 3634 status = PTR_ERR(res.label); 3635 goto out; 3636 } 3637 arg.bitmask = nfs4_bitmask(server, res.label); 3638 3639 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3640 if (!status) { 3641 update_changeattr(dir, &res.cinfo); 3642 status = nfs_post_op_update_inode(inode, res.fattr); 3643 if (!status) 3644 nfs_setsecurity(inode, res.fattr, res.label); 3645 } 3646 3647 3648 nfs4_label_free(res.label); 3649 3650 out: 3651 nfs_free_fattr(res.fattr); 3652 return status; 3653 } 3654 3655 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3656 { 3657 struct nfs4_exception exception = { }; 3658 int err; 3659 do { 3660 err = nfs4_handle_exception(NFS_SERVER(inode), 3661 _nfs4_proc_link(inode, dir, name), 3662 &exception); 3663 } while (exception.retry); 3664 return err; 3665 } 3666 3667 struct nfs4_createdata { 3668 struct rpc_message msg; 3669 struct nfs4_create_arg arg; 3670 struct nfs4_create_res res; 3671 struct nfs_fh fh; 3672 struct nfs_fattr fattr; 3673 struct nfs4_label *label; 3674 }; 3675 3676 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3677 struct qstr *name, struct iattr *sattr, u32 ftype) 3678 { 3679 struct nfs4_createdata *data; 3680 3681 data = kzalloc(sizeof(*data), GFP_KERNEL); 3682 if (data != NULL) { 3683 struct nfs_server *server = NFS_SERVER(dir); 3684 3685 data->label = nfs4_label_alloc(server, GFP_KERNEL); 3686 if (IS_ERR(data->label)) 3687 goto out_free; 3688 3689 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3690 data->msg.rpc_argp = &data->arg; 3691 data->msg.rpc_resp = &data->res; 3692 data->arg.dir_fh = NFS_FH(dir); 3693 data->arg.server = server; 3694 data->arg.name = name; 3695 data->arg.attrs = sattr; 3696 data->arg.ftype = ftype; 3697 data->arg.bitmask = nfs4_bitmask(server, data->label); 3698 data->res.server = server; 3699 data->res.fh = &data->fh; 3700 data->res.fattr = &data->fattr; 3701 data->res.label = data->label; 3702 nfs_fattr_init(data->res.fattr); 3703 } 3704 return data; 3705 out_free: 3706 kfree(data); 3707 return NULL; 3708 } 3709 3710 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3711 { 3712 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3713 &data->arg.seq_args, &data->res.seq_res, 1); 3714 if (status == 0) { 3715 update_changeattr(dir, &data->res.dir_cinfo); 3716 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 3717 } 3718 return status; 3719 } 3720 3721 static void nfs4_free_createdata(struct nfs4_createdata *data) 3722 { 3723 nfs4_label_free(data->label); 3724 kfree(data); 3725 } 3726 3727 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3728 struct page *page, unsigned int len, struct iattr *sattr, 3729 struct nfs4_label *label) 3730 { 3731 struct nfs4_createdata *data; 3732 int status = -ENAMETOOLONG; 3733 3734 if (len > NFS4_MAXPATHLEN) 3735 goto out; 3736 3737 status = -ENOMEM; 3738 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3739 if (data == NULL) 3740 goto out; 3741 3742 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3743 data->arg.u.symlink.pages = &page; 3744 data->arg.u.symlink.len = len; 3745 data->arg.label = label; 3746 3747 status = nfs4_do_create(dir, dentry, data); 3748 3749 nfs4_free_createdata(data); 3750 out: 3751 return status; 3752 } 3753 3754 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3755 struct page *page, unsigned int len, struct iattr *sattr) 3756 { 3757 struct nfs4_exception exception = { }; 3758 struct nfs4_label l, *label = NULL; 3759 int err; 3760 3761 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3762 3763 do { 3764 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 3765 trace_nfs4_symlink(dir, &dentry->d_name, err); 3766 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3767 &exception); 3768 } while (exception.retry); 3769 3770 nfs4_label_release_security(label); 3771 return err; 3772 } 3773 3774 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3775 struct iattr *sattr, struct nfs4_label *label) 3776 { 3777 struct nfs4_createdata *data; 3778 int status = -ENOMEM; 3779 3780 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 3781 if (data == NULL) 3782 goto out; 3783 3784 data->arg.label = label; 3785 status = nfs4_do_create(dir, dentry, data); 3786 3787 nfs4_free_createdata(data); 3788 out: 3789 return status; 3790 } 3791 3792 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3793 struct iattr *sattr) 3794 { 3795 struct nfs4_exception exception = { }; 3796 struct nfs4_label l, *label = NULL; 3797 int err; 3798 3799 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3800 3801 sattr->ia_mode &= ~current_umask(); 3802 do { 3803 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 3804 trace_nfs4_mkdir(dir, &dentry->d_name, err); 3805 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3806 &exception); 3807 } while (exception.retry); 3808 nfs4_label_release_security(label); 3809 3810 return err; 3811 } 3812 3813 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3814 u64 cookie, struct page **pages, unsigned int count, int plus) 3815 { 3816 struct inode *dir = dentry->d_inode; 3817 struct nfs4_readdir_arg args = { 3818 .fh = NFS_FH(dir), 3819 .pages = pages, 3820 .pgbase = 0, 3821 .count = count, 3822 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 3823 .plus = plus, 3824 }; 3825 struct nfs4_readdir_res res; 3826 struct rpc_message msg = { 3827 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 3828 .rpc_argp = &args, 3829 .rpc_resp = &res, 3830 .rpc_cred = cred, 3831 }; 3832 int status; 3833 3834 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 3835 dentry, 3836 (unsigned long long)cookie); 3837 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 3838 res.pgbase = args.pgbase; 3839 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 3840 if (status >= 0) { 3841 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 3842 status += args.pgbase; 3843 } 3844 3845 nfs_invalidate_atime(dir); 3846 3847 dprintk("%s: returns %d\n", __func__, status); 3848 return status; 3849 } 3850 3851 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3852 u64 cookie, struct page **pages, unsigned int count, int plus) 3853 { 3854 struct nfs4_exception exception = { }; 3855 int err; 3856 do { 3857 err = _nfs4_proc_readdir(dentry, cred, cookie, 3858 pages, count, plus); 3859 trace_nfs4_readdir(dentry->d_inode, err); 3860 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err, 3861 &exception); 3862 } while (exception.retry); 3863 return err; 3864 } 3865 3866 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3867 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 3868 { 3869 struct nfs4_createdata *data; 3870 int mode = sattr->ia_mode; 3871 int status = -ENOMEM; 3872 3873 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 3874 if (data == NULL) 3875 goto out; 3876 3877 if (S_ISFIFO(mode)) 3878 data->arg.ftype = NF4FIFO; 3879 else if (S_ISBLK(mode)) { 3880 data->arg.ftype = NF4BLK; 3881 data->arg.u.device.specdata1 = MAJOR(rdev); 3882 data->arg.u.device.specdata2 = MINOR(rdev); 3883 } 3884 else if (S_ISCHR(mode)) { 3885 data->arg.ftype = NF4CHR; 3886 data->arg.u.device.specdata1 = MAJOR(rdev); 3887 data->arg.u.device.specdata2 = MINOR(rdev); 3888 } else if (!S_ISSOCK(mode)) { 3889 status = -EINVAL; 3890 goto out_free; 3891 } 3892 3893 data->arg.label = label; 3894 status = nfs4_do_create(dir, dentry, data); 3895 out_free: 3896 nfs4_free_createdata(data); 3897 out: 3898 return status; 3899 } 3900 3901 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3902 struct iattr *sattr, dev_t rdev) 3903 { 3904 struct nfs4_exception exception = { }; 3905 struct nfs4_label l, *label = NULL; 3906 int err; 3907 3908 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3909 3910 sattr->ia_mode &= ~current_umask(); 3911 do { 3912 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 3913 trace_nfs4_mknod(dir, &dentry->d_name, err); 3914 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3915 &exception); 3916 } while (exception.retry); 3917 3918 nfs4_label_release_security(label); 3919 3920 return err; 3921 } 3922 3923 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 3924 struct nfs_fsstat *fsstat) 3925 { 3926 struct nfs4_statfs_arg args = { 3927 .fh = fhandle, 3928 .bitmask = server->attr_bitmask, 3929 }; 3930 struct nfs4_statfs_res res = { 3931 .fsstat = fsstat, 3932 }; 3933 struct rpc_message msg = { 3934 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 3935 .rpc_argp = &args, 3936 .rpc_resp = &res, 3937 }; 3938 3939 nfs_fattr_init(fsstat->fattr); 3940 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3941 } 3942 3943 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 3944 { 3945 struct nfs4_exception exception = { }; 3946 int err; 3947 do { 3948 err = nfs4_handle_exception(server, 3949 _nfs4_proc_statfs(server, fhandle, fsstat), 3950 &exception); 3951 } while (exception.retry); 3952 return err; 3953 } 3954 3955 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 3956 struct nfs_fsinfo *fsinfo) 3957 { 3958 struct nfs4_fsinfo_arg args = { 3959 .fh = fhandle, 3960 .bitmask = server->attr_bitmask, 3961 }; 3962 struct nfs4_fsinfo_res res = { 3963 .fsinfo = fsinfo, 3964 }; 3965 struct rpc_message msg = { 3966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 3967 .rpc_argp = &args, 3968 .rpc_resp = &res, 3969 }; 3970 3971 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3972 } 3973 3974 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3975 { 3976 struct nfs4_exception exception = { }; 3977 unsigned long now = jiffies; 3978 int err; 3979 3980 do { 3981 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 3982 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 3983 if (err == 0) { 3984 struct nfs_client *clp = server->nfs_client; 3985 3986 spin_lock(&clp->cl_lock); 3987 clp->cl_lease_time = fsinfo->lease_time * HZ; 3988 clp->cl_last_renewal = now; 3989 spin_unlock(&clp->cl_lock); 3990 break; 3991 } 3992 err = nfs4_handle_exception(server, err, &exception); 3993 } while (exception.retry); 3994 return err; 3995 } 3996 3997 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3998 { 3999 int error; 4000 4001 nfs_fattr_init(fsinfo->fattr); 4002 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 4003 if (error == 0) { 4004 /* block layout checks this! */ 4005 server->pnfs_blksize = fsinfo->blksize; 4006 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 4007 } 4008 4009 return error; 4010 } 4011 4012 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4013 struct nfs_pathconf *pathconf) 4014 { 4015 struct nfs4_pathconf_arg args = { 4016 .fh = fhandle, 4017 .bitmask = server->attr_bitmask, 4018 }; 4019 struct nfs4_pathconf_res res = { 4020 .pathconf = pathconf, 4021 }; 4022 struct rpc_message msg = { 4023 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 4024 .rpc_argp = &args, 4025 .rpc_resp = &res, 4026 }; 4027 4028 /* None of the pathconf attributes are mandatory to implement */ 4029 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 4030 memset(pathconf, 0, sizeof(*pathconf)); 4031 return 0; 4032 } 4033 4034 nfs_fattr_init(pathconf->fattr); 4035 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4036 } 4037 4038 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 4039 struct nfs_pathconf *pathconf) 4040 { 4041 struct nfs4_exception exception = { }; 4042 int err; 4043 4044 do { 4045 err = nfs4_handle_exception(server, 4046 _nfs4_proc_pathconf(server, fhandle, pathconf), 4047 &exception); 4048 } while (exception.retry); 4049 return err; 4050 } 4051 4052 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 4053 const struct nfs_open_context *ctx, 4054 const struct nfs_lock_context *l_ctx, 4055 fmode_t fmode) 4056 { 4057 const struct nfs_lockowner *lockowner = NULL; 4058 4059 if (l_ctx != NULL) 4060 lockowner = &l_ctx->lockowner; 4061 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner); 4062 } 4063 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4064 4065 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4066 const struct nfs_open_context *ctx, 4067 const struct nfs_lock_context *l_ctx, 4068 fmode_t fmode) 4069 { 4070 nfs4_stateid current_stateid; 4071 4072 /* If the current stateid represents a lost lock, then exit */ 4073 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4074 return true; 4075 return nfs4_stateid_match(stateid, ¤t_stateid); 4076 } 4077 4078 static bool nfs4_error_stateid_expired(int err) 4079 { 4080 switch (err) { 4081 case -NFS4ERR_DELEG_REVOKED: 4082 case -NFS4ERR_ADMIN_REVOKED: 4083 case -NFS4ERR_BAD_STATEID: 4084 case -NFS4ERR_STALE_STATEID: 4085 case -NFS4ERR_OLD_STATEID: 4086 case -NFS4ERR_OPENMODE: 4087 case -NFS4ERR_EXPIRED: 4088 return true; 4089 } 4090 return false; 4091 } 4092 4093 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr) 4094 { 4095 nfs_invalidate_atime(hdr->inode); 4096 } 4097 4098 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 4099 { 4100 struct nfs_server *server = NFS_SERVER(hdr->inode); 4101 4102 trace_nfs4_read(hdr, task->tk_status); 4103 if (nfs4_async_handle_error(task, server, 4104 hdr->args.context->state) == -EAGAIN) { 4105 rpc_restart_call_prepare(task); 4106 return -EAGAIN; 4107 } 4108 4109 __nfs4_read_done_cb(hdr); 4110 if (task->tk_status > 0) 4111 renew_lease(server, hdr->timestamp); 4112 return 0; 4113 } 4114 4115 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4116 struct nfs_pgio_args *args) 4117 { 4118 4119 if (!nfs4_error_stateid_expired(task->tk_status) || 4120 nfs4_stateid_is_current(&args->stateid, 4121 args->context, 4122 args->lock_context, 4123 FMODE_READ)) 4124 return false; 4125 rpc_restart_call_prepare(task); 4126 return true; 4127 } 4128 4129 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4130 { 4131 4132 dprintk("--> %s\n", __func__); 4133 4134 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4135 return -EAGAIN; 4136 if (nfs4_read_stateid_changed(task, &hdr->args)) 4137 return -EAGAIN; 4138 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4139 nfs4_read_done_cb(task, hdr); 4140 } 4141 4142 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 4143 struct rpc_message *msg) 4144 { 4145 hdr->timestamp = jiffies; 4146 hdr->pgio_done_cb = nfs4_read_done_cb; 4147 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4148 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); 4149 } 4150 4151 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 4152 struct nfs_pgio_header *hdr) 4153 { 4154 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode), 4155 &hdr->args.seq_args, 4156 &hdr->res.seq_res, 4157 task)) 4158 return 0; 4159 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 4160 hdr->args.lock_context, 4161 hdr->rw_ops->rw_mode) == -EIO) 4162 return -EIO; 4163 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 4164 return -EIO; 4165 return 0; 4166 } 4167 4168 static int nfs4_write_done_cb(struct rpc_task *task, 4169 struct nfs_pgio_header *hdr) 4170 { 4171 struct inode *inode = hdr->inode; 4172 4173 trace_nfs4_write(hdr, task->tk_status); 4174 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 4175 hdr->args.context->state) == -EAGAIN) { 4176 rpc_restart_call_prepare(task); 4177 return -EAGAIN; 4178 } 4179 if (task->tk_status >= 0) { 4180 renew_lease(NFS_SERVER(inode), hdr->timestamp); 4181 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr); 4182 } 4183 return 0; 4184 } 4185 4186 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4187 struct nfs_pgio_args *args) 4188 { 4189 4190 if (!nfs4_error_stateid_expired(task->tk_status) || 4191 nfs4_stateid_is_current(&args->stateid, 4192 args->context, 4193 args->lock_context, 4194 FMODE_WRITE)) 4195 return false; 4196 rpc_restart_call_prepare(task); 4197 return true; 4198 } 4199 4200 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 4201 { 4202 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 4203 return -EAGAIN; 4204 if (nfs4_write_stateid_changed(task, &hdr->args)) 4205 return -EAGAIN; 4206 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 4207 nfs4_write_done_cb(task, hdr); 4208 } 4209 4210 static 4211 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 4212 { 4213 /* Don't request attributes for pNFS or O_DIRECT writes */ 4214 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 4215 return false; 4216 /* Otherwise, request attributes if and only if we don't hold 4217 * a delegation 4218 */ 4219 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4220 } 4221 4222 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 4223 struct rpc_message *msg) 4224 { 4225 struct nfs_server *server = NFS_SERVER(hdr->inode); 4226 4227 if (!nfs4_write_need_cache_consistency_data(hdr)) { 4228 hdr->args.bitmask = NULL; 4229 hdr->res.fattr = NULL; 4230 } else 4231 hdr->args.bitmask = server->cache_consistency_bitmask; 4232 4233 if (!hdr->pgio_done_cb) 4234 hdr->pgio_done_cb = nfs4_write_done_cb; 4235 hdr->res.server = server; 4236 hdr->timestamp = jiffies; 4237 4238 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4239 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1); 4240 } 4241 4242 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4243 { 4244 nfs4_setup_sequence(NFS_SERVER(data->inode), 4245 &data->args.seq_args, 4246 &data->res.seq_res, 4247 task); 4248 } 4249 4250 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4251 { 4252 struct inode *inode = data->inode; 4253 4254 trace_nfs4_commit(data, task->tk_status); 4255 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) { 4256 rpc_restart_call_prepare(task); 4257 return -EAGAIN; 4258 } 4259 return 0; 4260 } 4261 4262 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4263 { 4264 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4265 return -EAGAIN; 4266 return data->commit_done_cb(task, data); 4267 } 4268 4269 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4270 { 4271 struct nfs_server *server = NFS_SERVER(data->inode); 4272 4273 if (data->commit_done_cb == NULL) 4274 data->commit_done_cb = nfs4_commit_done_cb; 4275 data->res.server = server; 4276 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4277 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4278 } 4279 4280 struct nfs4_renewdata { 4281 struct nfs_client *client; 4282 unsigned long timestamp; 4283 }; 4284 4285 /* 4286 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4287 * standalone procedure for queueing an asynchronous RENEW. 4288 */ 4289 static void nfs4_renew_release(void *calldata) 4290 { 4291 struct nfs4_renewdata *data = calldata; 4292 struct nfs_client *clp = data->client; 4293 4294 if (atomic_read(&clp->cl_count) > 1) 4295 nfs4_schedule_state_renewal(clp); 4296 nfs_put_client(clp); 4297 kfree(data); 4298 } 4299 4300 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4301 { 4302 struct nfs4_renewdata *data = calldata; 4303 struct nfs_client *clp = data->client; 4304 unsigned long timestamp = data->timestamp; 4305 4306 trace_nfs4_renew_async(clp, task->tk_status); 4307 switch (task->tk_status) { 4308 case 0: 4309 break; 4310 case -NFS4ERR_LEASE_MOVED: 4311 nfs4_schedule_lease_moved_recovery(clp); 4312 break; 4313 default: 4314 /* Unless we're shutting down, schedule state recovery! */ 4315 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 4316 return; 4317 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 4318 nfs4_schedule_lease_recovery(clp); 4319 return; 4320 } 4321 nfs4_schedule_path_down_recovery(clp); 4322 } 4323 do_renew_lease(clp, timestamp); 4324 } 4325 4326 static const struct rpc_call_ops nfs4_renew_ops = { 4327 .rpc_call_done = nfs4_renew_done, 4328 .rpc_release = nfs4_renew_release, 4329 }; 4330 4331 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 4332 { 4333 struct rpc_message msg = { 4334 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4335 .rpc_argp = clp, 4336 .rpc_cred = cred, 4337 }; 4338 struct nfs4_renewdata *data; 4339 4340 if (renew_flags == 0) 4341 return 0; 4342 if (!atomic_inc_not_zero(&clp->cl_count)) 4343 return -EIO; 4344 data = kmalloc(sizeof(*data), GFP_NOFS); 4345 if (data == NULL) 4346 return -ENOMEM; 4347 data->client = clp; 4348 data->timestamp = jiffies; 4349 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 4350 &nfs4_renew_ops, data); 4351 } 4352 4353 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 4354 { 4355 struct rpc_message msg = { 4356 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4357 .rpc_argp = clp, 4358 .rpc_cred = cred, 4359 }; 4360 unsigned long now = jiffies; 4361 int status; 4362 4363 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4364 if (status < 0) 4365 return status; 4366 do_renew_lease(clp, now); 4367 return 0; 4368 } 4369 4370 static inline int nfs4_server_supports_acls(struct nfs_server *server) 4371 { 4372 return server->caps & NFS_CAP_ACLS; 4373 } 4374 4375 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 4376 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 4377 * the stack. 4378 */ 4379 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 4380 4381 static int buf_to_pages_noslab(const void *buf, size_t buflen, 4382 struct page **pages, unsigned int *pgbase) 4383 { 4384 struct page *newpage, **spages; 4385 int rc = 0; 4386 size_t len; 4387 spages = pages; 4388 4389 do { 4390 len = min_t(size_t, PAGE_SIZE, buflen); 4391 newpage = alloc_page(GFP_KERNEL); 4392 4393 if (newpage == NULL) 4394 goto unwind; 4395 memcpy(page_address(newpage), buf, len); 4396 buf += len; 4397 buflen -= len; 4398 *pages++ = newpage; 4399 rc++; 4400 } while (buflen != 0); 4401 4402 return rc; 4403 4404 unwind: 4405 for(; rc > 0; rc--) 4406 __free_page(spages[rc-1]); 4407 return -ENOMEM; 4408 } 4409 4410 struct nfs4_cached_acl { 4411 int cached; 4412 size_t len; 4413 char data[0]; 4414 }; 4415 4416 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 4417 { 4418 struct nfs_inode *nfsi = NFS_I(inode); 4419 4420 spin_lock(&inode->i_lock); 4421 kfree(nfsi->nfs4_acl); 4422 nfsi->nfs4_acl = acl; 4423 spin_unlock(&inode->i_lock); 4424 } 4425 4426 static void nfs4_zap_acl_attr(struct inode *inode) 4427 { 4428 nfs4_set_cached_acl(inode, NULL); 4429 } 4430 4431 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 4432 { 4433 struct nfs_inode *nfsi = NFS_I(inode); 4434 struct nfs4_cached_acl *acl; 4435 int ret = -ENOENT; 4436 4437 spin_lock(&inode->i_lock); 4438 acl = nfsi->nfs4_acl; 4439 if (acl == NULL) 4440 goto out; 4441 if (buf == NULL) /* user is just asking for length */ 4442 goto out_len; 4443 if (acl->cached == 0) 4444 goto out; 4445 ret = -ERANGE; /* see getxattr(2) man page */ 4446 if (acl->len > buflen) 4447 goto out; 4448 memcpy(buf, acl->data, acl->len); 4449 out_len: 4450 ret = acl->len; 4451 out: 4452 spin_unlock(&inode->i_lock); 4453 return ret; 4454 } 4455 4456 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 4457 { 4458 struct nfs4_cached_acl *acl; 4459 size_t buflen = sizeof(*acl) + acl_len; 4460 4461 if (buflen <= PAGE_SIZE) { 4462 acl = kmalloc(buflen, GFP_KERNEL); 4463 if (acl == NULL) 4464 goto out; 4465 acl->cached = 1; 4466 _copy_from_pages(acl->data, pages, pgbase, acl_len); 4467 } else { 4468 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 4469 if (acl == NULL) 4470 goto out; 4471 acl->cached = 0; 4472 } 4473 acl->len = acl_len; 4474 out: 4475 nfs4_set_cached_acl(inode, acl); 4476 } 4477 4478 /* 4479 * The getxattr API returns the required buffer length when called with a 4480 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 4481 * the required buf. On a NULL buf, we send a page of data to the server 4482 * guessing that the ACL request can be serviced by a page. If so, we cache 4483 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 4484 * the cache. If not so, we throw away the page, and cache the required 4485 * length. The next getxattr call will then produce another round trip to 4486 * the server, this time with the input buf of the required size. 4487 */ 4488 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4489 { 4490 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 4491 struct nfs_getaclargs args = { 4492 .fh = NFS_FH(inode), 4493 .acl_pages = pages, 4494 .acl_len = buflen, 4495 }; 4496 struct nfs_getaclres res = { 4497 .acl_len = buflen, 4498 }; 4499 struct rpc_message msg = { 4500 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 4501 .rpc_argp = &args, 4502 .rpc_resp = &res, 4503 }; 4504 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4505 int ret = -ENOMEM, i; 4506 4507 /* As long as we're doing a round trip to the server anyway, 4508 * let's be prepared for a page of acl data. */ 4509 if (npages == 0) 4510 npages = 1; 4511 if (npages > ARRAY_SIZE(pages)) 4512 return -ERANGE; 4513 4514 for (i = 0; i < npages; i++) { 4515 pages[i] = alloc_page(GFP_KERNEL); 4516 if (!pages[i]) 4517 goto out_free; 4518 } 4519 4520 /* for decoding across pages */ 4521 res.acl_scratch = alloc_page(GFP_KERNEL); 4522 if (!res.acl_scratch) 4523 goto out_free; 4524 4525 args.acl_len = npages * PAGE_SIZE; 4526 args.acl_pgbase = 0; 4527 4528 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 4529 __func__, buf, buflen, npages, args.acl_len); 4530 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 4531 &msg, &args.seq_args, &res.seq_res, 0); 4532 if (ret) 4533 goto out_free; 4534 4535 /* Handle the case where the passed-in buffer is too short */ 4536 if (res.acl_flags & NFS4_ACL_TRUNC) { 4537 /* Did the user only issue a request for the acl length? */ 4538 if (buf == NULL) 4539 goto out_ok; 4540 ret = -ERANGE; 4541 goto out_free; 4542 } 4543 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 4544 if (buf) { 4545 if (res.acl_len > buflen) { 4546 ret = -ERANGE; 4547 goto out_free; 4548 } 4549 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 4550 } 4551 out_ok: 4552 ret = res.acl_len; 4553 out_free: 4554 for (i = 0; i < npages; i++) 4555 if (pages[i]) 4556 __free_page(pages[i]); 4557 if (res.acl_scratch) 4558 __free_page(res.acl_scratch); 4559 return ret; 4560 } 4561 4562 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4563 { 4564 struct nfs4_exception exception = { }; 4565 ssize_t ret; 4566 do { 4567 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 4568 trace_nfs4_get_acl(inode, ret); 4569 if (ret >= 0) 4570 break; 4571 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 4572 } while (exception.retry); 4573 return ret; 4574 } 4575 4576 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 4577 { 4578 struct nfs_server *server = NFS_SERVER(inode); 4579 int ret; 4580 4581 if (!nfs4_server_supports_acls(server)) 4582 return -EOPNOTSUPP; 4583 ret = nfs_revalidate_inode(server, inode); 4584 if (ret < 0) 4585 return ret; 4586 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 4587 nfs_zap_acl_cache(inode); 4588 ret = nfs4_read_cached_acl(inode, buf, buflen); 4589 if (ret != -ENOENT) 4590 /* -ENOENT is returned if there is no ACL or if there is an ACL 4591 * but no cached acl data, just the acl length */ 4592 return ret; 4593 return nfs4_get_acl_uncached(inode, buf, buflen); 4594 } 4595 4596 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4597 { 4598 struct nfs_server *server = NFS_SERVER(inode); 4599 struct page *pages[NFS4ACL_MAXPAGES]; 4600 struct nfs_setaclargs arg = { 4601 .fh = NFS_FH(inode), 4602 .acl_pages = pages, 4603 .acl_len = buflen, 4604 }; 4605 struct nfs_setaclres res; 4606 struct rpc_message msg = { 4607 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 4608 .rpc_argp = &arg, 4609 .rpc_resp = &res, 4610 }; 4611 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4612 int ret, i; 4613 4614 if (!nfs4_server_supports_acls(server)) 4615 return -EOPNOTSUPP; 4616 if (npages > ARRAY_SIZE(pages)) 4617 return -ERANGE; 4618 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 4619 if (i < 0) 4620 return i; 4621 nfs4_inode_return_delegation(inode); 4622 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4623 4624 /* 4625 * Free each page after tx, so the only ref left is 4626 * held by the network stack 4627 */ 4628 for (; i > 0; i--) 4629 put_page(pages[i-1]); 4630 4631 /* 4632 * Acl update can result in inode attribute update. 4633 * so mark the attribute cache invalid. 4634 */ 4635 spin_lock(&inode->i_lock); 4636 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 4637 spin_unlock(&inode->i_lock); 4638 nfs_access_zap_cache(inode); 4639 nfs_zap_acl_cache(inode); 4640 return ret; 4641 } 4642 4643 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4644 { 4645 struct nfs4_exception exception = { }; 4646 int err; 4647 do { 4648 err = __nfs4_proc_set_acl(inode, buf, buflen); 4649 trace_nfs4_set_acl(inode, err); 4650 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4651 &exception); 4652 } while (exception.retry); 4653 return err; 4654 } 4655 4656 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 4657 static int _nfs4_get_security_label(struct inode *inode, void *buf, 4658 size_t buflen) 4659 { 4660 struct nfs_server *server = NFS_SERVER(inode); 4661 struct nfs_fattr fattr; 4662 struct nfs4_label label = {0, 0, buflen, buf}; 4663 4664 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4665 struct nfs4_getattr_arg arg = { 4666 .fh = NFS_FH(inode), 4667 .bitmask = bitmask, 4668 }; 4669 struct nfs4_getattr_res res = { 4670 .fattr = &fattr, 4671 .label = &label, 4672 .server = server, 4673 }; 4674 struct rpc_message msg = { 4675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4676 .rpc_argp = &arg, 4677 .rpc_resp = &res, 4678 }; 4679 int ret; 4680 4681 nfs_fattr_init(&fattr); 4682 4683 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 4684 if (ret) 4685 return ret; 4686 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 4687 return -ENOENT; 4688 if (buflen < label.len) 4689 return -ERANGE; 4690 return 0; 4691 } 4692 4693 static int nfs4_get_security_label(struct inode *inode, void *buf, 4694 size_t buflen) 4695 { 4696 struct nfs4_exception exception = { }; 4697 int err; 4698 4699 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4700 return -EOPNOTSUPP; 4701 4702 do { 4703 err = _nfs4_get_security_label(inode, buf, buflen); 4704 trace_nfs4_get_security_label(inode, err); 4705 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4706 &exception); 4707 } while (exception.retry); 4708 return err; 4709 } 4710 4711 static int _nfs4_do_set_security_label(struct inode *inode, 4712 struct nfs4_label *ilabel, 4713 struct nfs_fattr *fattr, 4714 struct nfs4_label *olabel) 4715 { 4716 4717 struct iattr sattr = {0}; 4718 struct nfs_server *server = NFS_SERVER(inode); 4719 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4720 struct nfs_setattrargs arg = { 4721 .fh = NFS_FH(inode), 4722 .iap = &sattr, 4723 .server = server, 4724 .bitmask = bitmask, 4725 .label = ilabel, 4726 }; 4727 struct nfs_setattrres res = { 4728 .fattr = fattr, 4729 .label = olabel, 4730 .server = server, 4731 }; 4732 struct rpc_message msg = { 4733 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 4734 .rpc_argp = &arg, 4735 .rpc_resp = &res, 4736 }; 4737 int status; 4738 4739 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 4740 4741 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4742 if (status) 4743 dprintk("%s failed: %d\n", __func__, status); 4744 4745 return status; 4746 } 4747 4748 static int nfs4_do_set_security_label(struct inode *inode, 4749 struct nfs4_label *ilabel, 4750 struct nfs_fattr *fattr, 4751 struct nfs4_label *olabel) 4752 { 4753 struct nfs4_exception exception = { }; 4754 int err; 4755 4756 do { 4757 err = _nfs4_do_set_security_label(inode, ilabel, 4758 fattr, olabel); 4759 trace_nfs4_set_security_label(inode, err); 4760 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4761 &exception); 4762 } while (exception.retry); 4763 return err; 4764 } 4765 4766 static int 4767 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen) 4768 { 4769 struct nfs4_label ilabel, *olabel = NULL; 4770 struct nfs_fattr fattr; 4771 struct rpc_cred *cred; 4772 struct inode *inode = dentry->d_inode; 4773 int status; 4774 4775 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4776 return -EOPNOTSUPP; 4777 4778 nfs_fattr_init(&fattr); 4779 4780 ilabel.pi = 0; 4781 ilabel.lfs = 0; 4782 ilabel.label = (char *)buf; 4783 ilabel.len = buflen; 4784 4785 cred = rpc_lookup_cred(); 4786 if (IS_ERR(cred)) 4787 return PTR_ERR(cred); 4788 4789 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 4790 if (IS_ERR(olabel)) { 4791 status = -PTR_ERR(olabel); 4792 goto out; 4793 } 4794 4795 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 4796 if (status == 0) 4797 nfs_setsecurity(inode, &fattr, olabel); 4798 4799 nfs4_label_free(olabel); 4800 out: 4801 put_rpccred(cred); 4802 return status; 4803 } 4804 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 4805 4806 4807 static int 4808 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state) 4809 { 4810 struct nfs_client *clp = server->nfs_client; 4811 4812 if (task->tk_status >= 0) 4813 return 0; 4814 switch(task->tk_status) { 4815 case -NFS4ERR_DELEG_REVOKED: 4816 case -NFS4ERR_ADMIN_REVOKED: 4817 case -NFS4ERR_BAD_STATEID: 4818 if (state == NULL) 4819 break; 4820 nfs_remove_bad_delegation(state->inode); 4821 case -NFS4ERR_OPENMODE: 4822 if (state == NULL) 4823 break; 4824 if (nfs4_schedule_stateid_recovery(server, state) < 0) 4825 goto recovery_failed; 4826 goto wait_on_recovery; 4827 case -NFS4ERR_EXPIRED: 4828 if (state != NULL) { 4829 if (nfs4_schedule_stateid_recovery(server, state) < 0) 4830 goto recovery_failed; 4831 } 4832 case -NFS4ERR_STALE_STATEID: 4833 case -NFS4ERR_STALE_CLIENTID: 4834 nfs4_schedule_lease_recovery(clp); 4835 goto wait_on_recovery; 4836 case -NFS4ERR_MOVED: 4837 if (nfs4_schedule_migration_recovery(server) < 0) 4838 goto recovery_failed; 4839 goto wait_on_recovery; 4840 case -NFS4ERR_LEASE_MOVED: 4841 nfs4_schedule_lease_moved_recovery(clp); 4842 goto wait_on_recovery; 4843 #if defined(CONFIG_NFS_V4_1) 4844 case -NFS4ERR_BADSESSION: 4845 case -NFS4ERR_BADSLOT: 4846 case -NFS4ERR_BAD_HIGH_SLOT: 4847 case -NFS4ERR_DEADSESSION: 4848 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 4849 case -NFS4ERR_SEQ_FALSE_RETRY: 4850 case -NFS4ERR_SEQ_MISORDERED: 4851 dprintk("%s ERROR %d, Reset session\n", __func__, 4852 task->tk_status); 4853 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 4854 goto wait_on_recovery; 4855 #endif /* CONFIG_NFS_V4_1 */ 4856 case -NFS4ERR_DELAY: 4857 nfs_inc_server_stats(server, NFSIOS_DELAY); 4858 case -NFS4ERR_GRACE: 4859 rpc_delay(task, NFS4_POLL_RETRY_MAX); 4860 case -NFS4ERR_RETRY_UNCACHED_REP: 4861 case -NFS4ERR_OLD_STATEID: 4862 goto restart_call; 4863 } 4864 task->tk_status = nfs4_map_errors(task->tk_status); 4865 return 0; 4866 recovery_failed: 4867 task->tk_status = -EIO; 4868 return 0; 4869 wait_on_recovery: 4870 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 4871 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 4872 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 4873 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 4874 goto recovery_failed; 4875 restart_call: 4876 task->tk_status = 0; 4877 return -EAGAIN; 4878 } 4879 4880 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 4881 nfs4_verifier *bootverf) 4882 { 4883 __be32 verf[2]; 4884 4885 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 4886 /* An impossible timestamp guarantees this value 4887 * will never match a generated boot time. */ 4888 verf[0] = 0; 4889 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1); 4890 } else { 4891 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 4892 verf[0] = cpu_to_be32(nn->boot_time.tv_sec); 4893 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec); 4894 } 4895 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 4896 } 4897 4898 static unsigned int 4899 nfs4_init_nonuniform_client_string(const struct nfs_client *clp, 4900 char *buf, size_t len) 4901 { 4902 unsigned int result; 4903 4904 rcu_read_lock(); 4905 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s", 4906 clp->cl_ipaddr, 4907 rpc_peeraddr2str(clp->cl_rpcclient, 4908 RPC_DISPLAY_ADDR), 4909 rpc_peeraddr2str(clp->cl_rpcclient, 4910 RPC_DISPLAY_PROTO)); 4911 rcu_read_unlock(); 4912 return result; 4913 } 4914 4915 static unsigned int 4916 nfs4_init_uniform_client_string(const struct nfs_client *clp, 4917 char *buf, size_t len) 4918 { 4919 const char *nodename = clp->cl_rpcclient->cl_nodename; 4920 4921 if (nfs4_client_id_uniquifier[0] != '\0') 4922 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s", 4923 clp->rpc_ops->version, 4924 clp->cl_minorversion, 4925 nfs4_client_id_uniquifier, 4926 nodename); 4927 return scnprintf(buf, len, "Linux NFSv%u.%u %s", 4928 clp->rpc_ops->version, clp->cl_minorversion, 4929 nodename); 4930 } 4931 4932 /* 4933 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 4934 * services. Advertise one based on the address family of the 4935 * clientaddr. 4936 */ 4937 static unsigned int 4938 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 4939 { 4940 if (strchr(clp->cl_ipaddr, ':') != NULL) 4941 return scnprintf(buf, len, "tcp6"); 4942 else 4943 return scnprintf(buf, len, "tcp"); 4944 } 4945 4946 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 4947 { 4948 struct nfs4_setclientid *sc = calldata; 4949 4950 if (task->tk_status == 0) 4951 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 4952 } 4953 4954 static const struct rpc_call_ops nfs4_setclientid_ops = { 4955 .rpc_call_done = nfs4_setclientid_done, 4956 }; 4957 4958 /** 4959 * nfs4_proc_setclientid - Negotiate client ID 4960 * @clp: state data structure 4961 * @program: RPC program for NFSv4 callback service 4962 * @port: IP port number for NFS4 callback service 4963 * @cred: RPC credential to use for this call 4964 * @res: where to place the result 4965 * 4966 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4967 */ 4968 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 4969 unsigned short port, struct rpc_cred *cred, 4970 struct nfs4_setclientid_res *res) 4971 { 4972 nfs4_verifier sc_verifier; 4973 struct nfs4_setclientid setclientid = { 4974 .sc_verifier = &sc_verifier, 4975 .sc_prog = program, 4976 .sc_cb_ident = clp->cl_cb_ident, 4977 }; 4978 struct rpc_message msg = { 4979 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 4980 .rpc_argp = &setclientid, 4981 .rpc_resp = res, 4982 .rpc_cred = cred, 4983 }; 4984 struct rpc_task *task; 4985 struct rpc_task_setup task_setup_data = { 4986 .rpc_client = clp->cl_rpcclient, 4987 .rpc_message = &msg, 4988 .callback_ops = &nfs4_setclientid_ops, 4989 .callback_data = &setclientid, 4990 .flags = RPC_TASK_TIMEOUT, 4991 }; 4992 int status; 4993 4994 /* nfs_client_id4 */ 4995 nfs4_init_boot_verifier(clp, &sc_verifier); 4996 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 4997 setclientid.sc_name_len = 4998 nfs4_init_uniform_client_string(clp, 4999 setclientid.sc_name, 5000 sizeof(setclientid.sc_name)); 5001 else 5002 setclientid.sc_name_len = 5003 nfs4_init_nonuniform_client_string(clp, 5004 setclientid.sc_name, 5005 sizeof(setclientid.sc_name)); 5006 /* cb_client4 */ 5007 setclientid.sc_netid_len = 5008 nfs4_init_callback_netid(clp, 5009 setclientid.sc_netid, 5010 sizeof(setclientid.sc_netid)); 5011 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 5012 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 5013 clp->cl_ipaddr, port >> 8, port & 255); 5014 5015 dprintk("NFS call setclientid auth=%s, '%.*s'\n", 5016 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5017 setclientid.sc_name_len, setclientid.sc_name); 5018 task = rpc_run_task(&task_setup_data); 5019 if (IS_ERR(task)) { 5020 status = PTR_ERR(task); 5021 goto out; 5022 } 5023 status = task->tk_status; 5024 if (setclientid.sc_cred) { 5025 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 5026 put_rpccred(setclientid.sc_cred); 5027 } 5028 rpc_put_task(task); 5029 out: 5030 trace_nfs4_setclientid(clp, status); 5031 dprintk("NFS reply setclientid: %d\n", status); 5032 return status; 5033 } 5034 5035 /** 5036 * nfs4_proc_setclientid_confirm - Confirm client ID 5037 * @clp: state data structure 5038 * @res: result of a previous SETCLIENTID 5039 * @cred: RPC credential to use for this call 5040 * 5041 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5042 */ 5043 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 5044 struct nfs4_setclientid_res *arg, 5045 struct rpc_cred *cred) 5046 { 5047 struct rpc_message msg = { 5048 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 5049 .rpc_argp = arg, 5050 .rpc_cred = cred, 5051 }; 5052 int status; 5053 5054 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 5055 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5056 clp->cl_clientid); 5057 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5058 trace_nfs4_setclientid_confirm(clp, status); 5059 dprintk("NFS reply setclientid_confirm: %d\n", status); 5060 return status; 5061 } 5062 5063 struct nfs4_delegreturndata { 5064 struct nfs4_delegreturnargs args; 5065 struct nfs4_delegreturnres res; 5066 struct nfs_fh fh; 5067 nfs4_stateid stateid; 5068 unsigned long timestamp; 5069 struct nfs_fattr fattr; 5070 int rpc_status; 5071 struct inode *inode; 5072 bool roc; 5073 u32 roc_barrier; 5074 }; 5075 5076 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 5077 { 5078 struct nfs4_delegreturndata *data = calldata; 5079 5080 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5081 return; 5082 5083 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5084 switch (task->tk_status) { 5085 case 0: 5086 renew_lease(data->res.server, data->timestamp); 5087 case -NFS4ERR_ADMIN_REVOKED: 5088 case -NFS4ERR_DELEG_REVOKED: 5089 case -NFS4ERR_BAD_STATEID: 5090 case -NFS4ERR_OLD_STATEID: 5091 case -NFS4ERR_STALE_STATEID: 5092 case -NFS4ERR_EXPIRED: 5093 task->tk_status = 0; 5094 if (data->roc) 5095 pnfs_roc_set_barrier(data->inode, data->roc_barrier); 5096 break; 5097 default: 5098 if (nfs4_async_handle_error(task, data->res.server, NULL) == 5099 -EAGAIN) { 5100 rpc_restart_call_prepare(task); 5101 return; 5102 } 5103 } 5104 data->rpc_status = task->tk_status; 5105 } 5106 5107 static void nfs4_delegreturn_release(void *calldata) 5108 { 5109 struct nfs4_delegreturndata *data = calldata; 5110 5111 if (data->roc) 5112 pnfs_roc_release(data->inode); 5113 kfree(calldata); 5114 } 5115 5116 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5117 { 5118 struct nfs4_delegreturndata *d_data; 5119 5120 d_data = (struct nfs4_delegreturndata *)data; 5121 5122 if (d_data->roc && 5123 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task)) 5124 return; 5125 5126 nfs4_setup_sequence(d_data->res.server, 5127 &d_data->args.seq_args, 5128 &d_data->res.seq_res, 5129 task); 5130 } 5131 5132 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5133 .rpc_call_prepare = nfs4_delegreturn_prepare, 5134 .rpc_call_done = nfs4_delegreturn_done, 5135 .rpc_release = nfs4_delegreturn_release, 5136 }; 5137 5138 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5139 { 5140 struct nfs4_delegreturndata *data; 5141 struct nfs_server *server = NFS_SERVER(inode); 5142 struct rpc_task *task; 5143 struct rpc_message msg = { 5144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5145 .rpc_cred = cred, 5146 }; 5147 struct rpc_task_setup task_setup_data = { 5148 .rpc_client = server->client, 5149 .rpc_message = &msg, 5150 .callback_ops = &nfs4_delegreturn_ops, 5151 .flags = RPC_TASK_ASYNC, 5152 }; 5153 int status = 0; 5154 5155 data = kzalloc(sizeof(*data), GFP_NOFS); 5156 if (data == NULL) 5157 return -ENOMEM; 5158 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5159 data->args.fhandle = &data->fh; 5160 data->args.stateid = &data->stateid; 5161 data->args.bitmask = server->cache_consistency_bitmask; 5162 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5163 nfs4_stateid_copy(&data->stateid, stateid); 5164 data->res.fattr = &data->fattr; 5165 data->res.server = server; 5166 nfs_fattr_init(data->res.fattr); 5167 data->timestamp = jiffies; 5168 data->rpc_status = 0; 5169 data->inode = inode; 5170 data->roc = list_empty(&NFS_I(inode)->open_files) ? 5171 pnfs_roc(inode) : false; 5172 5173 task_setup_data.callback_data = data; 5174 msg.rpc_argp = &data->args; 5175 msg.rpc_resp = &data->res; 5176 task = rpc_run_task(&task_setup_data); 5177 if (IS_ERR(task)) 5178 return PTR_ERR(task); 5179 if (!issync) 5180 goto out; 5181 status = nfs4_wait_for_completion_rpc_task(task); 5182 if (status != 0) 5183 goto out; 5184 status = data->rpc_status; 5185 if (status == 0) 5186 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5187 else 5188 nfs_refresh_inode(inode, &data->fattr); 5189 out: 5190 rpc_put_task(task); 5191 return status; 5192 } 5193 5194 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5195 { 5196 struct nfs_server *server = NFS_SERVER(inode); 5197 struct nfs4_exception exception = { }; 5198 int err; 5199 do { 5200 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5201 trace_nfs4_delegreturn(inode, err); 5202 switch (err) { 5203 case -NFS4ERR_STALE_STATEID: 5204 case -NFS4ERR_EXPIRED: 5205 case 0: 5206 return 0; 5207 } 5208 err = nfs4_handle_exception(server, err, &exception); 5209 } while (exception.retry); 5210 return err; 5211 } 5212 5213 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 5214 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 5215 5216 /* 5217 * sleep, with exponential backoff, and retry the LOCK operation. 5218 */ 5219 static unsigned long 5220 nfs4_set_lock_task_retry(unsigned long timeout) 5221 { 5222 freezable_schedule_timeout_killable_unsafe(timeout); 5223 timeout <<= 1; 5224 if (timeout > NFS4_LOCK_MAXTIMEOUT) 5225 return NFS4_LOCK_MAXTIMEOUT; 5226 return timeout; 5227 } 5228 5229 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5230 { 5231 struct inode *inode = state->inode; 5232 struct nfs_server *server = NFS_SERVER(inode); 5233 struct nfs_client *clp = server->nfs_client; 5234 struct nfs_lockt_args arg = { 5235 .fh = NFS_FH(inode), 5236 .fl = request, 5237 }; 5238 struct nfs_lockt_res res = { 5239 .denied = request, 5240 }; 5241 struct rpc_message msg = { 5242 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5243 .rpc_argp = &arg, 5244 .rpc_resp = &res, 5245 .rpc_cred = state->owner->so_cred, 5246 }; 5247 struct nfs4_lock_state *lsp; 5248 int status; 5249 5250 arg.lock_owner.clientid = clp->cl_clientid; 5251 status = nfs4_set_lock_state(state, request); 5252 if (status != 0) 5253 goto out; 5254 lsp = request->fl_u.nfs4_fl.owner; 5255 arg.lock_owner.id = lsp->ls_seqid.owner_id; 5256 arg.lock_owner.s_dev = server->s_dev; 5257 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5258 switch (status) { 5259 case 0: 5260 request->fl_type = F_UNLCK; 5261 break; 5262 case -NFS4ERR_DENIED: 5263 status = 0; 5264 } 5265 request->fl_ops->fl_release_private(request); 5266 request->fl_ops = NULL; 5267 out: 5268 return status; 5269 } 5270 5271 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5272 { 5273 struct nfs4_exception exception = { }; 5274 int err; 5275 5276 do { 5277 err = _nfs4_proc_getlk(state, cmd, request); 5278 trace_nfs4_get_lock(request, state, cmd, err); 5279 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 5280 &exception); 5281 } while (exception.retry); 5282 return err; 5283 } 5284 5285 static int do_vfs_lock(struct file *file, struct file_lock *fl) 5286 { 5287 int res = 0; 5288 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 5289 case FL_POSIX: 5290 res = posix_lock_file_wait(file, fl); 5291 break; 5292 case FL_FLOCK: 5293 res = flock_lock_file_wait(file, fl); 5294 break; 5295 default: 5296 BUG(); 5297 } 5298 return res; 5299 } 5300 5301 struct nfs4_unlockdata { 5302 struct nfs_locku_args arg; 5303 struct nfs_locku_res res; 5304 struct nfs4_lock_state *lsp; 5305 struct nfs_open_context *ctx; 5306 struct file_lock fl; 5307 const struct nfs_server *server; 5308 unsigned long timestamp; 5309 }; 5310 5311 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 5312 struct nfs_open_context *ctx, 5313 struct nfs4_lock_state *lsp, 5314 struct nfs_seqid *seqid) 5315 { 5316 struct nfs4_unlockdata *p; 5317 struct inode *inode = lsp->ls_state->inode; 5318 5319 p = kzalloc(sizeof(*p), GFP_NOFS); 5320 if (p == NULL) 5321 return NULL; 5322 p->arg.fh = NFS_FH(inode); 5323 p->arg.fl = &p->fl; 5324 p->arg.seqid = seqid; 5325 p->res.seqid = seqid; 5326 p->arg.stateid = &lsp->ls_stateid; 5327 p->lsp = lsp; 5328 atomic_inc(&lsp->ls_count); 5329 /* Ensure we don't close file until we're done freeing locks! */ 5330 p->ctx = get_nfs_open_context(ctx); 5331 memcpy(&p->fl, fl, sizeof(p->fl)); 5332 p->server = NFS_SERVER(inode); 5333 return p; 5334 } 5335 5336 static void nfs4_locku_release_calldata(void *data) 5337 { 5338 struct nfs4_unlockdata *calldata = data; 5339 nfs_free_seqid(calldata->arg.seqid); 5340 nfs4_put_lock_state(calldata->lsp); 5341 put_nfs_open_context(calldata->ctx); 5342 kfree(calldata); 5343 } 5344 5345 static void nfs4_locku_done(struct rpc_task *task, void *data) 5346 { 5347 struct nfs4_unlockdata *calldata = data; 5348 5349 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 5350 return; 5351 switch (task->tk_status) { 5352 case 0: 5353 nfs4_stateid_copy(&calldata->lsp->ls_stateid, 5354 &calldata->res.stateid); 5355 renew_lease(calldata->server, calldata->timestamp); 5356 break; 5357 case -NFS4ERR_BAD_STATEID: 5358 case -NFS4ERR_OLD_STATEID: 5359 case -NFS4ERR_STALE_STATEID: 5360 case -NFS4ERR_EXPIRED: 5361 break; 5362 default: 5363 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN) 5364 rpc_restart_call_prepare(task); 5365 } 5366 nfs_release_seqid(calldata->arg.seqid); 5367 } 5368 5369 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 5370 { 5371 struct nfs4_unlockdata *calldata = data; 5372 5373 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 5374 goto out_wait; 5375 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 5376 /* Note: exit _without_ running nfs4_locku_done */ 5377 goto out_no_action; 5378 } 5379 calldata->timestamp = jiffies; 5380 if (nfs4_setup_sequence(calldata->server, 5381 &calldata->arg.seq_args, 5382 &calldata->res.seq_res, 5383 task) != 0) 5384 nfs_release_seqid(calldata->arg.seqid); 5385 return; 5386 out_no_action: 5387 task->tk_action = NULL; 5388 out_wait: 5389 nfs4_sequence_done(task, &calldata->res.seq_res); 5390 } 5391 5392 static const struct rpc_call_ops nfs4_locku_ops = { 5393 .rpc_call_prepare = nfs4_locku_prepare, 5394 .rpc_call_done = nfs4_locku_done, 5395 .rpc_release = nfs4_locku_release_calldata, 5396 }; 5397 5398 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 5399 struct nfs_open_context *ctx, 5400 struct nfs4_lock_state *lsp, 5401 struct nfs_seqid *seqid) 5402 { 5403 struct nfs4_unlockdata *data; 5404 struct rpc_message msg = { 5405 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 5406 .rpc_cred = ctx->cred, 5407 }; 5408 struct rpc_task_setup task_setup_data = { 5409 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 5410 .rpc_message = &msg, 5411 .callback_ops = &nfs4_locku_ops, 5412 .workqueue = nfsiod_workqueue, 5413 .flags = RPC_TASK_ASYNC, 5414 }; 5415 5416 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 5417 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 5418 5419 /* Ensure this is an unlock - when canceling a lock, the 5420 * canceled lock is passed in, and it won't be an unlock. 5421 */ 5422 fl->fl_type = F_UNLCK; 5423 5424 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 5425 if (data == NULL) { 5426 nfs_free_seqid(seqid); 5427 return ERR_PTR(-ENOMEM); 5428 } 5429 5430 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5431 msg.rpc_argp = &data->arg; 5432 msg.rpc_resp = &data->res; 5433 task_setup_data.callback_data = data; 5434 return rpc_run_task(&task_setup_data); 5435 } 5436 5437 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 5438 { 5439 struct inode *inode = state->inode; 5440 struct nfs4_state_owner *sp = state->owner; 5441 struct nfs_inode *nfsi = NFS_I(inode); 5442 struct nfs_seqid *seqid; 5443 struct nfs4_lock_state *lsp; 5444 struct rpc_task *task; 5445 int status = 0; 5446 unsigned char fl_flags = request->fl_flags; 5447 5448 status = nfs4_set_lock_state(state, request); 5449 /* Unlock _before_ we do the RPC call */ 5450 request->fl_flags |= FL_EXISTS; 5451 /* Exclude nfs_delegation_claim_locks() */ 5452 mutex_lock(&sp->so_delegreturn_mutex); 5453 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 5454 down_read(&nfsi->rwsem); 5455 if (do_vfs_lock(request->fl_file, request) == -ENOENT) { 5456 up_read(&nfsi->rwsem); 5457 mutex_unlock(&sp->so_delegreturn_mutex); 5458 goto out; 5459 } 5460 up_read(&nfsi->rwsem); 5461 mutex_unlock(&sp->so_delegreturn_mutex); 5462 if (status != 0) 5463 goto out; 5464 /* Is this a delegated lock? */ 5465 lsp = request->fl_u.nfs4_fl.owner; 5466 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 5467 goto out; 5468 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 5469 status = -ENOMEM; 5470 if (seqid == NULL) 5471 goto out; 5472 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 5473 status = PTR_ERR(task); 5474 if (IS_ERR(task)) 5475 goto out; 5476 status = nfs4_wait_for_completion_rpc_task(task); 5477 rpc_put_task(task); 5478 out: 5479 request->fl_flags = fl_flags; 5480 trace_nfs4_unlock(request, state, F_SETLK, status); 5481 return status; 5482 } 5483 5484 struct nfs4_lockdata { 5485 struct nfs_lock_args arg; 5486 struct nfs_lock_res res; 5487 struct nfs4_lock_state *lsp; 5488 struct nfs_open_context *ctx; 5489 struct file_lock fl; 5490 unsigned long timestamp; 5491 int rpc_status; 5492 int cancelled; 5493 struct nfs_server *server; 5494 }; 5495 5496 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 5497 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 5498 gfp_t gfp_mask) 5499 { 5500 struct nfs4_lockdata *p; 5501 struct inode *inode = lsp->ls_state->inode; 5502 struct nfs_server *server = NFS_SERVER(inode); 5503 5504 p = kzalloc(sizeof(*p), gfp_mask); 5505 if (p == NULL) 5506 return NULL; 5507 5508 p->arg.fh = NFS_FH(inode); 5509 p->arg.fl = &p->fl; 5510 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 5511 if (p->arg.open_seqid == NULL) 5512 goto out_free; 5513 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask); 5514 if (p->arg.lock_seqid == NULL) 5515 goto out_free_seqid; 5516 p->arg.lock_stateid = &lsp->ls_stateid; 5517 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 5518 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 5519 p->arg.lock_owner.s_dev = server->s_dev; 5520 p->res.lock_seqid = p->arg.lock_seqid; 5521 p->lsp = lsp; 5522 p->server = server; 5523 atomic_inc(&lsp->ls_count); 5524 p->ctx = get_nfs_open_context(ctx); 5525 memcpy(&p->fl, fl, sizeof(p->fl)); 5526 return p; 5527 out_free_seqid: 5528 nfs_free_seqid(p->arg.open_seqid); 5529 out_free: 5530 kfree(p); 5531 return NULL; 5532 } 5533 5534 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 5535 { 5536 struct nfs4_lockdata *data = calldata; 5537 struct nfs4_state *state = data->lsp->ls_state; 5538 5539 dprintk("%s: begin!\n", __func__); 5540 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 5541 goto out_wait; 5542 /* Do we need to do an open_to_lock_owner? */ 5543 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 5544 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 5545 goto out_release_lock_seqid; 5546 } 5547 data->arg.open_stateid = &state->open_stateid; 5548 data->arg.new_lock_owner = 1; 5549 data->res.open_seqid = data->arg.open_seqid; 5550 } else 5551 data->arg.new_lock_owner = 0; 5552 if (!nfs4_valid_open_stateid(state)) { 5553 data->rpc_status = -EBADF; 5554 task->tk_action = NULL; 5555 goto out_release_open_seqid; 5556 } 5557 data->timestamp = jiffies; 5558 if (nfs4_setup_sequence(data->server, 5559 &data->arg.seq_args, 5560 &data->res.seq_res, 5561 task) == 0) 5562 return; 5563 out_release_open_seqid: 5564 nfs_release_seqid(data->arg.open_seqid); 5565 out_release_lock_seqid: 5566 nfs_release_seqid(data->arg.lock_seqid); 5567 out_wait: 5568 nfs4_sequence_done(task, &data->res.seq_res); 5569 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 5570 } 5571 5572 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 5573 { 5574 struct nfs4_lockdata *data = calldata; 5575 5576 dprintk("%s: begin!\n", __func__); 5577 5578 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5579 return; 5580 5581 data->rpc_status = task->tk_status; 5582 if (data->arg.new_lock_owner != 0) { 5583 if (data->rpc_status == 0) 5584 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 5585 else 5586 goto out; 5587 } 5588 if (data->rpc_status == 0) { 5589 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid); 5590 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags); 5591 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); 5592 } 5593 out: 5594 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 5595 } 5596 5597 static void nfs4_lock_release(void *calldata) 5598 { 5599 struct nfs4_lockdata *data = calldata; 5600 5601 dprintk("%s: begin!\n", __func__); 5602 nfs_free_seqid(data->arg.open_seqid); 5603 if (data->cancelled != 0) { 5604 struct rpc_task *task; 5605 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 5606 data->arg.lock_seqid); 5607 if (!IS_ERR(task)) 5608 rpc_put_task_async(task); 5609 dprintk("%s: cancelling lock!\n", __func__); 5610 } else 5611 nfs_free_seqid(data->arg.lock_seqid); 5612 nfs4_put_lock_state(data->lsp); 5613 put_nfs_open_context(data->ctx); 5614 kfree(data); 5615 dprintk("%s: done!\n", __func__); 5616 } 5617 5618 static const struct rpc_call_ops nfs4_lock_ops = { 5619 .rpc_call_prepare = nfs4_lock_prepare, 5620 .rpc_call_done = nfs4_lock_done, 5621 .rpc_release = nfs4_lock_release, 5622 }; 5623 5624 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 5625 { 5626 switch (error) { 5627 case -NFS4ERR_ADMIN_REVOKED: 5628 case -NFS4ERR_BAD_STATEID: 5629 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5630 if (new_lock_owner != 0 || 5631 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 5632 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 5633 break; 5634 case -NFS4ERR_STALE_STATEID: 5635 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5636 case -NFS4ERR_EXPIRED: 5637 nfs4_schedule_lease_recovery(server->nfs_client); 5638 }; 5639 } 5640 5641 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 5642 { 5643 struct nfs4_lockdata *data; 5644 struct rpc_task *task; 5645 struct rpc_message msg = { 5646 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 5647 .rpc_cred = state->owner->so_cred, 5648 }; 5649 struct rpc_task_setup task_setup_data = { 5650 .rpc_client = NFS_CLIENT(state->inode), 5651 .rpc_message = &msg, 5652 .callback_ops = &nfs4_lock_ops, 5653 .workqueue = nfsiod_workqueue, 5654 .flags = RPC_TASK_ASYNC, 5655 }; 5656 int ret; 5657 5658 dprintk("%s: begin!\n", __func__); 5659 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 5660 fl->fl_u.nfs4_fl.owner, 5661 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 5662 if (data == NULL) 5663 return -ENOMEM; 5664 if (IS_SETLKW(cmd)) 5665 data->arg.block = 1; 5666 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5667 msg.rpc_argp = &data->arg; 5668 msg.rpc_resp = &data->res; 5669 task_setup_data.callback_data = data; 5670 if (recovery_type > NFS_LOCK_NEW) { 5671 if (recovery_type == NFS_LOCK_RECLAIM) 5672 data->arg.reclaim = NFS_LOCK_RECLAIM; 5673 nfs4_set_sequence_privileged(&data->arg.seq_args); 5674 } 5675 task = rpc_run_task(&task_setup_data); 5676 if (IS_ERR(task)) 5677 return PTR_ERR(task); 5678 ret = nfs4_wait_for_completion_rpc_task(task); 5679 if (ret == 0) { 5680 ret = data->rpc_status; 5681 if (ret) 5682 nfs4_handle_setlk_error(data->server, data->lsp, 5683 data->arg.new_lock_owner, ret); 5684 } else 5685 data->cancelled = 1; 5686 rpc_put_task(task); 5687 dprintk("%s: done, ret = %d!\n", __func__, ret); 5688 return ret; 5689 } 5690 5691 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 5692 { 5693 struct nfs_server *server = NFS_SERVER(state->inode); 5694 struct nfs4_exception exception = { 5695 .inode = state->inode, 5696 }; 5697 int err; 5698 5699 do { 5700 /* Cache the lock if possible... */ 5701 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5702 return 0; 5703 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 5704 trace_nfs4_lock_reclaim(request, state, F_SETLK, err); 5705 if (err != -NFS4ERR_DELAY) 5706 break; 5707 nfs4_handle_exception(server, err, &exception); 5708 } while (exception.retry); 5709 return err; 5710 } 5711 5712 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 5713 { 5714 struct nfs_server *server = NFS_SERVER(state->inode); 5715 struct nfs4_exception exception = { 5716 .inode = state->inode, 5717 }; 5718 int err; 5719 5720 err = nfs4_set_lock_state(state, request); 5721 if (err != 0) 5722 return err; 5723 if (!recover_lost_locks) { 5724 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 5725 return 0; 5726 } 5727 do { 5728 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5729 return 0; 5730 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 5731 trace_nfs4_lock_expired(request, state, F_SETLK, err); 5732 switch (err) { 5733 default: 5734 goto out; 5735 case -NFS4ERR_GRACE: 5736 case -NFS4ERR_DELAY: 5737 nfs4_handle_exception(server, err, &exception); 5738 err = 0; 5739 } 5740 } while (exception.retry); 5741 out: 5742 return err; 5743 } 5744 5745 #if defined(CONFIG_NFS_V4_1) 5746 /** 5747 * nfs41_check_expired_locks - possibly free a lock stateid 5748 * 5749 * @state: NFSv4 state for an inode 5750 * 5751 * Returns NFS_OK if recovery for this stateid is now finished. 5752 * Otherwise a negative NFS4ERR value is returned. 5753 */ 5754 static int nfs41_check_expired_locks(struct nfs4_state *state) 5755 { 5756 int status, ret = -NFS4ERR_BAD_STATEID; 5757 struct nfs4_lock_state *lsp; 5758 struct nfs_server *server = NFS_SERVER(state->inode); 5759 5760 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 5761 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 5762 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 5763 5764 status = nfs41_test_stateid(server, 5765 &lsp->ls_stateid, 5766 cred); 5767 trace_nfs4_test_lock_stateid(state, lsp, status); 5768 if (status != NFS_OK) { 5769 /* Free the stateid unless the server 5770 * informs us the stateid is unrecognized. */ 5771 if (status != -NFS4ERR_BAD_STATEID) 5772 nfs41_free_stateid(server, 5773 &lsp->ls_stateid, 5774 cred); 5775 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 5776 ret = status; 5777 } 5778 } 5779 }; 5780 5781 return ret; 5782 } 5783 5784 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 5785 { 5786 int status = NFS_OK; 5787 5788 if (test_bit(LK_STATE_IN_USE, &state->flags)) 5789 status = nfs41_check_expired_locks(state); 5790 if (status != NFS_OK) 5791 status = nfs4_lock_expired(state, request); 5792 return status; 5793 } 5794 #endif 5795 5796 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5797 { 5798 struct nfs4_state_owner *sp = state->owner; 5799 struct nfs_inode *nfsi = NFS_I(state->inode); 5800 unsigned char fl_flags = request->fl_flags; 5801 unsigned int seq; 5802 int status = -ENOLCK; 5803 5804 if ((fl_flags & FL_POSIX) && 5805 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 5806 goto out; 5807 /* Is this a delegated open? */ 5808 status = nfs4_set_lock_state(state, request); 5809 if (status != 0) 5810 goto out; 5811 request->fl_flags |= FL_ACCESS; 5812 status = do_vfs_lock(request->fl_file, request); 5813 if (status < 0) 5814 goto out; 5815 down_read(&nfsi->rwsem); 5816 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 5817 /* Yes: cache locks! */ 5818 /* ...but avoid races with delegation recall... */ 5819 request->fl_flags = fl_flags & ~FL_SLEEP; 5820 status = do_vfs_lock(request->fl_file, request); 5821 goto out_unlock; 5822 } 5823 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 5824 up_read(&nfsi->rwsem); 5825 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 5826 if (status != 0) 5827 goto out; 5828 down_read(&nfsi->rwsem); 5829 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) { 5830 status = -NFS4ERR_DELAY; 5831 goto out_unlock; 5832 } 5833 /* Note: we always want to sleep here! */ 5834 request->fl_flags = fl_flags | FL_SLEEP; 5835 if (do_vfs_lock(request->fl_file, request) < 0) 5836 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock " 5837 "manager!\n", __func__); 5838 out_unlock: 5839 up_read(&nfsi->rwsem); 5840 out: 5841 request->fl_flags = fl_flags; 5842 return status; 5843 } 5844 5845 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5846 { 5847 struct nfs4_exception exception = { 5848 .state = state, 5849 .inode = state->inode, 5850 }; 5851 int err; 5852 5853 do { 5854 err = _nfs4_proc_setlk(state, cmd, request); 5855 trace_nfs4_set_lock(request, state, cmd, err); 5856 if (err == -NFS4ERR_DENIED) 5857 err = -EAGAIN; 5858 err = nfs4_handle_exception(NFS_SERVER(state->inode), 5859 err, &exception); 5860 } while (exception.retry); 5861 return err; 5862 } 5863 5864 static int 5865 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 5866 { 5867 struct nfs_open_context *ctx; 5868 struct nfs4_state *state; 5869 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 5870 int status; 5871 5872 /* verify open state */ 5873 ctx = nfs_file_open_context(filp); 5874 state = ctx->state; 5875 5876 if (request->fl_start < 0 || request->fl_end < 0) 5877 return -EINVAL; 5878 5879 if (IS_GETLK(cmd)) { 5880 if (state != NULL) 5881 return nfs4_proc_getlk(state, F_GETLK, request); 5882 return 0; 5883 } 5884 5885 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 5886 return -EINVAL; 5887 5888 if (request->fl_type == F_UNLCK) { 5889 if (state != NULL) 5890 return nfs4_proc_unlck(state, cmd, request); 5891 return 0; 5892 } 5893 5894 if (state == NULL) 5895 return -ENOLCK; 5896 /* 5897 * Don't rely on the VFS having checked the file open mode, 5898 * since it won't do this for flock() locks. 5899 */ 5900 switch (request->fl_type) { 5901 case F_RDLCK: 5902 if (!(filp->f_mode & FMODE_READ)) 5903 return -EBADF; 5904 break; 5905 case F_WRLCK: 5906 if (!(filp->f_mode & FMODE_WRITE)) 5907 return -EBADF; 5908 } 5909 5910 do { 5911 status = nfs4_proc_setlk(state, cmd, request); 5912 if ((status != -EAGAIN) || IS_SETLK(cmd)) 5913 break; 5914 timeout = nfs4_set_lock_task_retry(timeout); 5915 status = -ERESTARTSYS; 5916 if (signalled()) 5917 break; 5918 } while(status < 0); 5919 return status; 5920 } 5921 5922 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 5923 { 5924 struct nfs_server *server = NFS_SERVER(state->inode); 5925 int err; 5926 5927 err = nfs4_set_lock_state(state, fl); 5928 if (err != 0) 5929 return err; 5930 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 5931 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 5932 } 5933 5934 struct nfs_release_lockowner_data { 5935 struct nfs4_lock_state *lsp; 5936 struct nfs_server *server; 5937 struct nfs_release_lockowner_args args; 5938 struct nfs_release_lockowner_res res; 5939 unsigned long timestamp; 5940 }; 5941 5942 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 5943 { 5944 struct nfs_release_lockowner_data *data = calldata; 5945 struct nfs_server *server = data->server; 5946 nfs40_setup_sequence(server, &data->args.seq_args, 5947 &data->res.seq_res, task); 5948 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 5949 data->timestamp = jiffies; 5950 } 5951 5952 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 5953 { 5954 struct nfs_release_lockowner_data *data = calldata; 5955 struct nfs_server *server = data->server; 5956 5957 nfs40_sequence_done(task, &data->res.seq_res); 5958 5959 switch (task->tk_status) { 5960 case 0: 5961 renew_lease(server, data->timestamp); 5962 break; 5963 case -NFS4ERR_STALE_CLIENTID: 5964 case -NFS4ERR_EXPIRED: 5965 nfs4_schedule_lease_recovery(server->nfs_client); 5966 break; 5967 case -NFS4ERR_LEASE_MOVED: 5968 case -NFS4ERR_DELAY: 5969 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) 5970 rpc_restart_call_prepare(task); 5971 } 5972 } 5973 5974 static void nfs4_release_lockowner_release(void *calldata) 5975 { 5976 struct nfs_release_lockowner_data *data = calldata; 5977 nfs4_free_lock_state(data->server, data->lsp); 5978 kfree(calldata); 5979 } 5980 5981 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 5982 .rpc_call_prepare = nfs4_release_lockowner_prepare, 5983 .rpc_call_done = nfs4_release_lockowner_done, 5984 .rpc_release = nfs4_release_lockowner_release, 5985 }; 5986 5987 static void 5988 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 5989 { 5990 struct nfs_release_lockowner_data *data; 5991 struct rpc_message msg = { 5992 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 5993 }; 5994 5995 if (server->nfs_client->cl_mvops->minor_version != 0) 5996 return; 5997 5998 data = kmalloc(sizeof(*data), GFP_NOFS); 5999 if (!data) 6000 return; 6001 data->lsp = lsp; 6002 data->server = server; 6003 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 6004 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 6005 data->args.lock_owner.s_dev = server->s_dev; 6006 6007 msg.rpc_argp = &data->args; 6008 msg.rpc_resp = &data->res; 6009 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 6010 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 6011 } 6012 6013 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 6014 6015 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key, 6016 const void *buf, size_t buflen, 6017 int flags, int type) 6018 { 6019 if (strcmp(key, "") != 0) 6020 return -EINVAL; 6021 6022 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen); 6023 } 6024 6025 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key, 6026 void *buf, size_t buflen, int type) 6027 { 6028 if (strcmp(key, "") != 0) 6029 return -EINVAL; 6030 6031 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen); 6032 } 6033 6034 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list, 6035 size_t list_len, const char *name, 6036 size_t name_len, int type) 6037 { 6038 size_t len = sizeof(XATTR_NAME_NFSV4_ACL); 6039 6040 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 6041 return 0; 6042 6043 if (list && len <= list_len) 6044 memcpy(list, XATTR_NAME_NFSV4_ACL, len); 6045 return len; 6046 } 6047 6048 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6049 static inline int nfs4_server_supports_labels(struct nfs_server *server) 6050 { 6051 return server->caps & NFS_CAP_SECURITY_LABEL; 6052 } 6053 6054 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key, 6055 const void *buf, size_t buflen, 6056 int flags, int type) 6057 { 6058 if (security_ismaclabel(key)) 6059 return nfs4_set_security_label(dentry, buf, buflen); 6060 6061 return -EOPNOTSUPP; 6062 } 6063 6064 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key, 6065 void *buf, size_t buflen, int type) 6066 { 6067 if (security_ismaclabel(key)) 6068 return nfs4_get_security_label(dentry->d_inode, buf, buflen); 6069 return -EOPNOTSUPP; 6070 } 6071 6072 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list, 6073 size_t list_len, const char *name, 6074 size_t name_len, int type) 6075 { 6076 size_t len = 0; 6077 6078 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) { 6079 len = security_inode_listsecurity(dentry->d_inode, NULL, 0); 6080 if (list && len <= list_len) 6081 security_inode_listsecurity(dentry->d_inode, list, len); 6082 } 6083 return len; 6084 } 6085 6086 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 6087 .prefix = XATTR_SECURITY_PREFIX, 6088 .list = nfs4_xattr_list_nfs4_label, 6089 .get = nfs4_xattr_get_nfs4_label, 6090 .set = nfs4_xattr_set_nfs4_label, 6091 }; 6092 #endif 6093 6094 6095 /* 6096 * nfs_fhget will use either the mounted_on_fileid or the fileid 6097 */ 6098 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6099 { 6100 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6101 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6102 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6103 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6104 return; 6105 6106 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6107 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6108 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6109 fattr->nlink = 2; 6110 } 6111 6112 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6113 const struct qstr *name, 6114 struct nfs4_fs_locations *fs_locations, 6115 struct page *page) 6116 { 6117 struct nfs_server *server = NFS_SERVER(dir); 6118 u32 bitmask[3] = { 6119 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6120 }; 6121 struct nfs4_fs_locations_arg args = { 6122 .dir_fh = NFS_FH(dir), 6123 .name = name, 6124 .page = page, 6125 .bitmask = bitmask, 6126 }; 6127 struct nfs4_fs_locations_res res = { 6128 .fs_locations = fs_locations, 6129 }; 6130 struct rpc_message msg = { 6131 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6132 .rpc_argp = &args, 6133 .rpc_resp = &res, 6134 }; 6135 int status; 6136 6137 dprintk("%s: start\n", __func__); 6138 6139 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6140 * is not supported */ 6141 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6142 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 6143 else 6144 bitmask[0] |= FATTR4_WORD0_FILEID; 6145 6146 nfs_fattr_init(&fs_locations->fattr); 6147 fs_locations->server = server; 6148 fs_locations->nlocations = 0; 6149 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6150 dprintk("%s: returned status = %d\n", __func__, status); 6151 return status; 6152 } 6153 6154 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6155 const struct qstr *name, 6156 struct nfs4_fs_locations *fs_locations, 6157 struct page *page) 6158 { 6159 struct nfs4_exception exception = { }; 6160 int err; 6161 do { 6162 err = _nfs4_proc_fs_locations(client, dir, name, 6163 fs_locations, page); 6164 trace_nfs4_get_fs_locations(dir, name, err); 6165 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6166 &exception); 6167 } while (exception.retry); 6168 return err; 6169 } 6170 6171 /* 6172 * This operation also signals the server that this client is 6173 * performing migration recovery. The server can stop returning 6174 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 6175 * appended to this compound to identify the client ID which is 6176 * performing recovery. 6177 */ 6178 static int _nfs40_proc_get_locations(struct inode *inode, 6179 struct nfs4_fs_locations *locations, 6180 struct page *page, struct rpc_cred *cred) 6181 { 6182 struct nfs_server *server = NFS_SERVER(inode); 6183 struct rpc_clnt *clnt = server->client; 6184 u32 bitmask[2] = { 6185 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6186 }; 6187 struct nfs4_fs_locations_arg args = { 6188 .clientid = server->nfs_client->cl_clientid, 6189 .fh = NFS_FH(inode), 6190 .page = page, 6191 .bitmask = bitmask, 6192 .migration = 1, /* skip LOOKUP */ 6193 .renew = 1, /* append RENEW */ 6194 }; 6195 struct nfs4_fs_locations_res res = { 6196 .fs_locations = locations, 6197 .migration = 1, 6198 .renew = 1, 6199 }; 6200 struct rpc_message msg = { 6201 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6202 .rpc_argp = &args, 6203 .rpc_resp = &res, 6204 .rpc_cred = cred, 6205 }; 6206 unsigned long now = jiffies; 6207 int status; 6208 6209 nfs_fattr_init(&locations->fattr); 6210 locations->server = server; 6211 locations->nlocations = 0; 6212 6213 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6214 nfs4_set_sequence_privileged(&args.seq_args); 6215 status = nfs4_call_sync_sequence(clnt, server, &msg, 6216 &args.seq_args, &res.seq_res); 6217 if (status) 6218 return status; 6219 6220 renew_lease(server, now); 6221 return 0; 6222 } 6223 6224 #ifdef CONFIG_NFS_V4_1 6225 6226 /* 6227 * This operation also signals the server that this client is 6228 * performing migration recovery. The server can stop asserting 6229 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 6230 * performing this operation is identified in the SEQUENCE 6231 * operation in this compound. 6232 * 6233 * When the client supports GETATTR(fs_locations_info), it can 6234 * be plumbed in here. 6235 */ 6236 static int _nfs41_proc_get_locations(struct inode *inode, 6237 struct nfs4_fs_locations *locations, 6238 struct page *page, struct rpc_cred *cred) 6239 { 6240 struct nfs_server *server = NFS_SERVER(inode); 6241 struct rpc_clnt *clnt = server->client; 6242 u32 bitmask[2] = { 6243 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6244 }; 6245 struct nfs4_fs_locations_arg args = { 6246 .fh = NFS_FH(inode), 6247 .page = page, 6248 .bitmask = bitmask, 6249 .migration = 1, /* skip LOOKUP */ 6250 }; 6251 struct nfs4_fs_locations_res res = { 6252 .fs_locations = locations, 6253 .migration = 1, 6254 }; 6255 struct rpc_message msg = { 6256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6257 .rpc_argp = &args, 6258 .rpc_resp = &res, 6259 .rpc_cred = cred, 6260 }; 6261 int status; 6262 6263 nfs_fattr_init(&locations->fattr); 6264 locations->server = server; 6265 locations->nlocations = 0; 6266 6267 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6268 nfs4_set_sequence_privileged(&args.seq_args); 6269 status = nfs4_call_sync_sequence(clnt, server, &msg, 6270 &args.seq_args, &res.seq_res); 6271 if (status == NFS4_OK && 6272 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6273 status = -NFS4ERR_LEASE_MOVED; 6274 return status; 6275 } 6276 6277 #endif /* CONFIG_NFS_V4_1 */ 6278 6279 /** 6280 * nfs4_proc_get_locations - discover locations for a migrated FSID 6281 * @inode: inode on FSID that is migrating 6282 * @locations: result of query 6283 * @page: buffer 6284 * @cred: credential to use for this operation 6285 * 6286 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 6287 * operation failed, or a negative errno if a local error occurred. 6288 * 6289 * On success, "locations" is filled in, but if the server has 6290 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 6291 * asserted. 6292 * 6293 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 6294 * from this client that require migration recovery. 6295 */ 6296 int nfs4_proc_get_locations(struct inode *inode, 6297 struct nfs4_fs_locations *locations, 6298 struct page *page, struct rpc_cred *cred) 6299 { 6300 struct nfs_server *server = NFS_SERVER(inode); 6301 struct nfs_client *clp = server->nfs_client; 6302 const struct nfs4_mig_recovery_ops *ops = 6303 clp->cl_mvops->mig_recovery_ops; 6304 struct nfs4_exception exception = { }; 6305 int status; 6306 6307 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6308 (unsigned long long)server->fsid.major, 6309 (unsigned long long)server->fsid.minor, 6310 clp->cl_hostname); 6311 nfs_display_fhandle(NFS_FH(inode), __func__); 6312 6313 do { 6314 status = ops->get_locations(inode, locations, page, cred); 6315 if (status != -NFS4ERR_DELAY) 6316 break; 6317 nfs4_handle_exception(server, status, &exception); 6318 } while (exception.retry); 6319 return status; 6320 } 6321 6322 /* 6323 * This operation also signals the server that this client is 6324 * performing "lease moved" recovery. The server can stop 6325 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 6326 * is appended to this compound to identify the client ID which is 6327 * performing recovery. 6328 */ 6329 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6330 { 6331 struct nfs_server *server = NFS_SERVER(inode); 6332 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 6333 struct rpc_clnt *clnt = server->client; 6334 struct nfs4_fsid_present_arg args = { 6335 .fh = NFS_FH(inode), 6336 .clientid = clp->cl_clientid, 6337 .renew = 1, /* append RENEW */ 6338 }; 6339 struct nfs4_fsid_present_res res = { 6340 .renew = 1, 6341 }; 6342 struct rpc_message msg = { 6343 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6344 .rpc_argp = &args, 6345 .rpc_resp = &res, 6346 .rpc_cred = cred, 6347 }; 6348 unsigned long now = jiffies; 6349 int status; 6350 6351 res.fh = nfs_alloc_fhandle(); 6352 if (res.fh == NULL) 6353 return -ENOMEM; 6354 6355 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6356 nfs4_set_sequence_privileged(&args.seq_args); 6357 status = nfs4_call_sync_sequence(clnt, server, &msg, 6358 &args.seq_args, &res.seq_res); 6359 nfs_free_fhandle(res.fh); 6360 if (status) 6361 return status; 6362 6363 do_renew_lease(clp, now); 6364 return 0; 6365 } 6366 6367 #ifdef CONFIG_NFS_V4_1 6368 6369 /* 6370 * This operation also signals the server that this client is 6371 * performing "lease moved" recovery. The server can stop asserting 6372 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 6373 * this operation is identified in the SEQUENCE operation in this 6374 * compound. 6375 */ 6376 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6377 { 6378 struct nfs_server *server = NFS_SERVER(inode); 6379 struct rpc_clnt *clnt = server->client; 6380 struct nfs4_fsid_present_arg args = { 6381 .fh = NFS_FH(inode), 6382 }; 6383 struct nfs4_fsid_present_res res = { 6384 }; 6385 struct rpc_message msg = { 6386 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6387 .rpc_argp = &args, 6388 .rpc_resp = &res, 6389 .rpc_cred = cred, 6390 }; 6391 int status; 6392 6393 res.fh = nfs_alloc_fhandle(); 6394 if (res.fh == NULL) 6395 return -ENOMEM; 6396 6397 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6398 nfs4_set_sequence_privileged(&args.seq_args); 6399 status = nfs4_call_sync_sequence(clnt, server, &msg, 6400 &args.seq_args, &res.seq_res); 6401 nfs_free_fhandle(res.fh); 6402 if (status == NFS4_OK && 6403 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6404 status = -NFS4ERR_LEASE_MOVED; 6405 return status; 6406 } 6407 6408 #endif /* CONFIG_NFS_V4_1 */ 6409 6410 /** 6411 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 6412 * @inode: inode on FSID to check 6413 * @cred: credential to use for this operation 6414 * 6415 * Server indicates whether the FSID is present, moved, or not 6416 * recognized. This operation is necessary to clear a LEASE_MOVED 6417 * condition for this client ID. 6418 * 6419 * Returns NFS4_OK if the FSID is present on this server, 6420 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 6421 * NFS4ERR code if some error occurred on the server, or a 6422 * negative errno if a local failure occurred. 6423 */ 6424 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6425 { 6426 struct nfs_server *server = NFS_SERVER(inode); 6427 struct nfs_client *clp = server->nfs_client; 6428 const struct nfs4_mig_recovery_ops *ops = 6429 clp->cl_mvops->mig_recovery_ops; 6430 struct nfs4_exception exception = { }; 6431 int status; 6432 6433 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6434 (unsigned long long)server->fsid.major, 6435 (unsigned long long)server->fsid.minor, 6436 clp->cl_hostname); 6437 nfs_display_fhandle(NFS_FH(inode), __func__); 6438 6439 do { 6440 status = ops->fsid_present(inode, cred); 6441 if (status != -NFS4ERR_DELAY) 6442 break; 6443 nfs4_handle_exception(server, status, &exception); 6444 } while (exception.retry); 6445 return status; 6446 } 6447 6448 /** 6449 * If 'use_integrity' is true and the state managment nfs_client 6450 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 6451 * and the machine credential as per RFC3530bis and RFC5661 Security 6452 * Considerations sections. Otherwise, just use the user cred with the 6453 * filesystem's rpc_client. 6454 */ 6455 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 6456 { 6457 int status; 6458 struct nfs4_secinfo_arg args = { 6459 .dir_fh = NFS_FH(dir), 6460 .name = name, 6461 }; 6462 struct nfs4_secinfo_res res = { 6463 .flavors = flavors, 6464 }; 6465 struct rpc_message msg = { 6466 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 6467 .rpc_argp = &args, 6468 .rpc_resp = &res, 6469 }; 6470 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 6471 struct rpc_cred *cred = NULL; 6472 6473 if (use_integrity) { 6474 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 6475 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 6476 msg.rpc_cred = cred; 6477 } 6478 6479 dprintk("NFS call secinfo %s\n", name->name); 6480 6481 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 6482 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 6483 6484 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 6485 &res.seq_res, 0); 6486 dprintk("NFS reply secinfo: %d\n", status); 6487 6488 if (cred) 6489 put_rpccred(cred); 6490 6491 return status; 6492 } 6493 6494 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 6495 struct nfs4_secinfo_flavors *flavors) 6496 { 6497 struct nfs4_exception exception = { }; 6498 int err; 6499 do { 6500 err = -NFS4ERR_WRONGSEC; 6501 6502 /* try to use integrity protection with machine cred */ 6503 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 6504 err = _nfs4_proc_secinfo(dir, name, flavors, true); 6505 6506 /* 6507 * if unable to use integrity protection, or SECINFO with 6508 * integrity protection returns NFS4ERR_WRONGSEC (which is 6509 * disallowed by spec, but exists in deployed servers) use 6510 * the current filesystem's rpc_client and the user cred. 6511 */ 6512 if (err == -NFS4ERR_WRONGSEC) 6513 err = _nfs4_proc_secinfo(dir, name, flavors, false); 6514 6515 trace_nfs4_secinfo(dir, name, err); 6516 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6517 &exception); 6518 } while (exception.retry); 6519 return err; 6520 } 6521 6522 #ifdef CONFIG_NFS_V4_1 6523 /* 6524 * Check the exchange flags returned by the server for invalid flags, having 6525 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 6526 * DS flags set. 6527 */ 6528 static int nfs4_check_cl_exchange_flags(u32 flags) 6529 { 6530 if (flags & ~EXCHGID4_FLAG_MASK_R) 6531 goto out_inval; 6532 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 6533 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 6534 goto out_inval; 6535 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 6536 goto out_inval; 6537 return NFS_OK; 6538 out_inval: 6539 return -NFS4ERR_INVAL; 6540 } 6541 6542 static bool 6543 nfs41_same_server_scope(struct nfs41_server_scope *a, 6544 struct nfs41_server_scope *b) 6545 { 6546 if (a->server_scope_sz == b->server_scope_sz && 6547 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 6548 return true; 6549 6550 return false; 6551 } 6552 6553 /* 6554 * nfs4_proc_bind_conn_to_session() 6555 * 6556 * The 4.1 client currently uses the same TCP connection for the 6557 * fore and backchannel. 6558 */ 6559 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 6560 { 6561 int status; 6562 struct nfs41_bind_conn_to_session_res res; 6563 struct rpc_message msg = { 6564 .rpc_proc = 6565 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 6566 .rpc_argp = clp, 6567 .rpc_resp = &res, 6568 .rpc_cred = cred, 6569 }; 6570 6571 dprintk("--> %s\n", __func__); 6572 6573 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS); 6574 if (unlikely(res.session == NULL)) { 6575 status = -ENOMEM; 6576 goto out; 6577 } 6578 6579 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6580 trace_nfs4_bind_conn_to_session(clp, status); 6581 if (status == 0) { 6582 if (memcmp(res.session->sess_id.data, 6583 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 6584 dprintk("NFS: %s: Session ID mismatch\n", __func__); 6585 status = -EIO; 6586 goto out_session; 6587 } 6588 if (res.dir != NFS4_CDFS4_BOTH) { 6589 dprintk("NFS: %s: Unexpected direction from server\n", 6590 __func__); 6591 status = -EIO; 6592 goto out_session; 6593 } 6594 if (res.use_conn_in_rdma_mode) { 6595 dprintk("NFS: %s: Server returned RDMA mode = true\n", 6596 __func__); 6597 status = -EIO; 6598 goto out_session; 6599 } 6600 } 6601 out_session: 6602 kfree(res.session); 6603 out: 6604 dprintk("<-- %s status= %d\n", __func__, status); 6605 return status; 6606 } 6607 6608 /* 6609 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 6610 * and operations we'd like to see to enable certain features in the allow map 6611 */ 6612 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 6613 .how = SP4_MACH_CRED, 6614 .enforce.u.words = { 6615 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6616 1 << (OP_EXCHANGE_ID - 32) | 6617 1 << (OP_CREATE_SESSION - 32) | 6618 1 << (OP_DESTROY_SESSION - 32) | 6619 1 << (OP_DESTROY_CLIENTID - 32) 6620 }, 6621 .allow.u.words = { 6622 [0] = 1 << (OP_CLOSE) | 6623 1 << (OP_LOCKU) | 6624 1 << (OP_COMMIT), 6625 [1] = 1 << (OP_SECINFO - 32) | 6626 1 << (OP_SECINFO_NO_NAME - 32) | 6627 1 << (OP_TEST_STATEID - 32) | 6628 1 << (OP_FREE_STATEID - 32) | 6629 1 << (OP_WRITE - 32) 6630 } 6631 }; 6632 6633 /* 6634 * Select the state protection mode for client `clp' given the server results 6635 * from exchange_id in `sp'. 6636 * 6637 * Returns 0 on success, negative errno otherwise. 6638 */ 6639 static int nfs4_sp4_select_mode(struct nfs_client *clp, 6640 struct nfs41_state_protection *sp) 6641 { 6642 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 6643 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6644 1 << (OP_EXCHANGE_ID - 32) | 6645 1 << (OP_CREATE_SESSION - 32) | 6646 1 << (OP_DESTROY_SESSION - 32) | 6647 1 << (OP_DESTROY_CLIENTID - 32) 6648 }; 6649 unsigned int i; 6650 6651 if (sp->how == SP4_MACH_CRED) { 6652 /* Print state protect result */ 6653 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 6654 for (i = 0; i <= LAST_NFS4_OP; i++) { 6655 if (test_bit(i, sp->enforce.u.longs)) 6656 dfprintk(MOUNT, " enforce op %d\n", i); 6657 if (test_bit(i, sp->allow.u.longs)) 6658 dfprintk(MOUNT, " allow op %d\n", i); 6659 } 6660 6661 /* make sure nothing is on enforce list that isn't supported */ 6662 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 6663 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 6664 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6665 return -EINVAL; 6666 } 6667 } 6668 6669 /* 6670 * Minimal mode - state operations are allowed to use machine 6671 * credential. Note this already happens by default, so the 6672 * client doesn't have to do anything more than the negotiation. 6673 * 6674 * NOTE: we don't care if EXCHANGE_ID is in the list - 6675 * we're already using the machine cred for exchange_id 6676 * and will never use a different cred. 6677 */ 6678 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 6679 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 6680 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 6681 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 6682 dfprintk(MOUNT, "sp4_mach_cred:\n"); 6683 dfprintk(MOUNT, " minimal mode enabled\n"); 6684 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags); 6685 } else { 6686 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6687 return -EINVAL; 6688 } 6689 6690 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 6691 test_bit(OP_LOCKU, sp->allow.u.longs)) { 6692 dfprintk(MOUNT, " cleanup mode enabled\n"); 6693 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags); 6694 } 6695 6696 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 6697 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 6698 dfprintk(MOUNT, " secinfo mode enabled\n"); 6699 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags); 6700 } 6701 6702 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 6703 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 6704 dfprintk(MOUNT, " stateid mode enabled\n"); 6705 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags); 6706 } 6707 6708 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 6709 dfprintk(MOUNT, " write mode enabled\n"); 6710 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags); 6711 } 6712 6713 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 6714 dfprintk(MOUNT, " commit mode enabled\n"); 6715 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags); 6716 } 6717 } 6718 6719 return 0; 6720 } 6721 6722 /* 6723 * _nfs4_proc_exchange_id() 6724 * 6725 * Wrapper for EXCHANGE_ID operation. 6726 */ 6727 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 6728 u32 sp4_how) 6729 { 6730 nfs4_verifier verifier; 6731 struct nfs41_exchange_id_args args = { 6732 .verifier = &verifier, 6733 .client = clp, 6734 #ifdef CONFIG_NFS_V4_1_MIGRATION 6735 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6736 EXCHGID4_FLAG_BIND_PRINC_STATEID | 6737 EXCHGID4_FLAG_SUPP_MOVED_MIGR, 6738 #else 6739 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6740 EXCHGID4_FLAG_BIND_PRINC_STATEID, 6741 #endif 6742 }; 6743 struct nfs41_exchange_id_res res = { 6744 0 6745 }; 6746 int status; 6747 struct rpc_message msg = { 6748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 6749 .rpc_argp = &args, 6750 .rpc_resp = &res, 6751 .rpc_cred = cred, 6752 }; 6753 6754 nfs4_init_boot_verifier(clp, &verifier); 6755 args.id_len = nfs4_init_uniform_client_string(clp, args.id, 6756 sizeof(args.id)); 6757 dprintk("NFS call exchange_id auth=%s, '%.*s'\n", 6758 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6759 args.id_len, args.id); 6760 6761 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 6762 GFP_NOFS); 6763 if (unlikely(res.server_owner == NULL)) { 6764 status = -ENOMEM; 6765 goto out; 6766 } 6767 6768 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 6769 GFP_NOFS); 6770 if (unlikely(res.server_scope == NULL)) { 6771 status = -ENOMEM; 6772 goto out_server_owner; 6773 } 6774 6775 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 6776 if (unlikely(res.impl_id == NULL)) { 6777 status = -ENOMEM; 6778 goto out_server_scope; 6779 } 6780 6781 switch (sp4_how) { 6782 case SP4_NONE: 6783 args.state_protect.how = SP4_NONE; 6784 break; 6785 6786 case SP4_MACH_CRED: 6787 args.state_protect = nfs4_sp4_mach_cred_request; 6788 break; 6789 6790 default: 6791 /* unsupported! */ 6792 WARN_ON_ONCE(1); 6793 status = -EINVAL; 6794 goto out_server_scope; 6795 } 6796 6797 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6798 trace_nfs4_exchange_id(clp, status); 6799 if (status == 0) 6800 status = nfs4_check_cl_exchange_flags(res.flags); 6801 6802 if (status == 0) 6803 status = nfs4_sp4_select_mode(clp, &res.state_protect); 6804 6805 if (status == 0) { 6806 clp->cl_clientid = res.clientid; 6807 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R); 6808 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) 6809 clp->cl_seqid = res.seqid; 6810 6811 kfree(clp->cl_serverowner); 6812 clp->cl_serverowner = res.server_owner; 6813 res.server_owner = NULL; 6814 6815 /* use the most recent implementation id */ 6816 kfree(clp->cl_implid); 6817 clp->cl_implid = res.impl_id; 6818 6819 if (clp->cl_serverscope != NULL && 6820 !nfs41_same_server_scope(clp->cl_serverscope, 6821 res.server_scope)) { 6822 dprintk("%s: server_scope mismatch detected\n", 6823 __func__); 6824 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 6825 kfree(clp->cl_serverscope); 6826 clp->cl_serverscope = NULL; 6827 } 6828 6829 if (clp->cl_serverscope == NULL) { 6830 clp->cl_serverscope = res.server_scope; 6831 goto out; 6832 } 6833 } else 6834 kfree(res.impl_id); 6835 6836 out_server_owner: 6837 kfree(res.server_owner); 6838 out_server_scope: 6839 kfree(res.server_scope); 6840 out: 6841 if (clp->cl_implid != NULL) 6842 dprintk("NFS reply exchange_id: Server Implementation ID: " 6843 "domain: %s, name: %s, date: %llu,%u\n", 6844 clp->cl_implid->domain, clp->cl_implid->name, 6845 clp->cl_implid->date.seconds, 6846 clp->cl_implid->date.nseconds); 6847 dprintk("NFS reply exchange_id: %d\n", status); 6848 return status; 6849 } 6850 6851 /* 6852 * nfs4_proc_exchange_id() 6853 * 6854 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6855 * 6856 * Since the clientid has expired, all compounds using sessions 6857 * associated with the stale clientid will be returning 6858 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 6859 * be in some phase of session reset. 6860 * 6861 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 6862 */ 6863 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 6864 { 6865 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 6866 int status; 6867 6868 /* try SP4_MACH_CRED if krb5i/p */ 6869 if (authflavor == RPC_AUTH_GSS_KRB5I || 6870 authflavor == RPC_AUTH_GSS_KRB5P) { 6871 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 6872 if (!status) 6873 return 0; 6874 } 6875 6876 /* try SP4_NONE */ 6877 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 6878 } 6879 6880 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 6881 struct rpc_cred *cred) 6882 { 6883 struct rpc_message msg = { 6884 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 6885 .rpc_argp = clp, 6886 .rpc_cred = cred, 6887 }; 6888 int status; 6889 6890 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6891 trace_nfs4_destroy_clientid(clp, status); 6892 if (status) 6893 dprintk("NFS: Got error %d from the server %s on " 6894 "DESTROY_CLIENTID.", status, clp->cl_hostname); 6895 return status; 6896 } 6897 6898 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 6899 struct rpc_cred *cred) 6900 { 6901 unsigned int loop; 6902 int ret; 6903 6904 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 6905 ret = _nfs4_proc_destroy_clientid(clp, cred); 6906 switch (ret) { 6907 case -NFS4ERR_DELAY: 6908 case -NFS4ERR_CLIENTID_BUSY: 6909 ssleep(1); 6910 break; 6911 default: 6912 return ret; 6913 } 6914 } 6915 return 0; 6916 } 6917 6918 int nfs4_destroy_clientid(struct nfs_client *clp) 6919 { 6920 struct rpc_cred *cred; 6921 int ret = 0; 6922 6923 if (clp->cl_mvops->minor_version < 1) 6924 goto out; 6925 if (clp->cl_exchange_flags == 0) 6926 goto out; 6927 if (clp->cl_preserve_clid) 6928 goto out; 6929 cred = nfs4_get_clid_cred(clp); 6930 ret = nfs4_proc_destroy_clientid(clp, cred); 6931 if (cred) 6932 put_rpccred(cred); 6933 switch (ret) { 6934 case 0: 6935 case -NFS4ERR_STALE_CLIENTID: 6936 clp->cl_exchange_flags = 0; 6937 } 6938 out: 6939 return ret; 6940 } 6941 6942 struct nfs4_get_lease_time_data { 6943 struct nfs4_get_lease_time_args *args; 6944 struct nfs4_get_lease_time_res *res; 6945 struct nfs_client *clp; 6946 }; 6947 6948 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 6949 void *calldata) 6950 { 6951 struct nfs4_get_lease_time_data *data = 6952 (struct nfs4_get_lease_time_data *)calldata; 6953 6954 dprintk("--> %s\n", __func__); 6955 /* just setup sequence, do not trigger session recovery 6956 since we're invoked within one */ 6957 nfs41_setup_sequence(data->clp->cl_session, 6958 &data->args->la_seq_args, 6959 &data->res->lr_seq_res, 6960 task); 6961 dprintk("<-- %s\n", __func__); 6962 } 6963 6964 /* 6965 * Called from nfs4_state_manager thread for session setup, so don't recover 6966 * from sequence operation or clientid errors. 6967 */ 6968 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 6969 { 6970 struct nfs4_get_lease_time_data *data = 6971 (struct nfs4_get_lease_time_data *)calldata; 6972 6973 dprintk("--> %s\n", __func__); 6974 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 6975 return; 6976 switch (task->tk_status) { 6977 case -NFS4ERR_DELAY: 6978 case -NFS4ERR_GRACE: 6979 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 6980 rpc_delay(task, NFS4_POLL_RETRY_MIN); 6981 task->tk_status = 0; 6982 /* fall through */ 6983 case -NFS4ERR_RETRY_UNCACHED_REP: 6984 rpc_restart_call_prepare(task); 6985 return; 6986 } 6987 dprintk("<-- %s\n", __func__); 6988 } 6989 6990 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 6991 .rpc_call_prepare = nfs4_get_lease_time_prepare, 6992 .rpc_call_done = nfs4_get_lease_time_done, 6993 }; 6994 6995 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 6996 { 6997 struct rpc_task *task; 6998 struct nfs4_get_lease_time_args args; 6999 struct nfs4_get_lease_time_res res = { 7000 .lr_fsinfo = fsinfo, 7001 }; 7002 struct nfs4_get_lease_time_data data = { 7003 .args = &args, 7004 .res = &res, 7005 .clp = clp, 7006 }; 7007 struct rpc_message msg = { 7008 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 7009 .rpc_argp = &args, 7010 .rpc_resp = &res, 7011 }; 7012 struct rpc_task_setup task_setup = { 7013 .rpc_client = clp->cl_rpcclient, 7014 .rpc_message = &msg, 7015 .callback_ops = &nfs4_get_lease_time_ops, 7016 .callback_data = &data, 7017 .flags = RPC_TASK_TIMEOUT, 7018 }; 7019 int status; 7020 7021 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 7022 nfs4_set_sequence_privileged(&args.la_seq_args); 7023 dprintk("--> %s\n", __func__); 7024 task = rpc_run_task(&task_setup); 7025 7026 if (IS_ERR(task)) 7027 status = PTR_ERR(task); 7028 else { 7029 status = task->tk_status; 7030 rpc_put_task(task); 7031 } 7032 dprintk("<-- %s return %d\n", __func__, status); 7033 7034 return status; 7035 } 7036 7037 /* 7038 * Initialize the values to be used by the client in CREATE_SESSION 7039 * If nfs4_init_session set the fore channel request and response sizes, 7040 * use them. 7041 * 7042 * Set the back channel max_resp_sz_cached to zero to force the client to 7043 * always set csa_cachethis to FALSE because the current implementation 7044 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 7045 */ 7046 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 7047 { 7048 unsigned int max_rqst_sz, max_resp_sz; 7049 7050 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 7051 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 7052 7053 /* Fore channel attributes */ 7054 args->fc_attrs.max_rqst_sz = max_rqst_sz; 7055 args->fc_attrs.max_resp_sz = max_resp_sz; 7056 args->fc_attrs.max_ops = NFS4_MAX_OPS; 7057 args->fc_attrs.max_reqs = max_session_slots; 7058 7059 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 7060 "max_ops=%u max_reqs=%u\n", 7061 __func__, 7062 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 7063 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 7064 7065 /* Back channel attributes */ 7066 args->bc_attrs.max_rqst_sz = PAGE_SIZE; 7067 args->bc_attrs.max_resp_sz = PAGE_SIZE; 7068 args->bc_attrs.max_resp_sz_cached = 0; 7069 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 7070 args->bc_attrs.max_reqs = 1; 7071 7072 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 7073 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 7074 __func__, 7075 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 7076 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 7077 args->bc_attrs.max_reqs); 7078 } 7079 7080 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 7081 { 7082 struct nfs4_channel_attrs *sent = &args->fc_attrs; 7083 struct nfs4_channel_attrs *rcvd = &session->fc_attrs; 7084 7085 if (rcvd->max_resp_sz > sent->max_resp_sz) 7086 return -EINVAL; 7087 /* 7088 * Our requested max_ops is the minimum we need; we're not 7089 * prepared to break up compounds into smaller pieces than that. 7090 * So, no point even trying to continue if the server won't 7091 * cooperate: 7092 */ 7093 if (rcvd->max_ops < sent->max_ops) 7094 return -EINVAL; 7095 if (rcvd->max_reqs == 0) 7096 return -EINVAL; 7097 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 7098 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 7099 return 0; 7100 } 7101 7102 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 7103 { 7104 struct nfs4_channel_attrs *sent = &args->bc_attrs; 7105 struct nfs4_channel_attrs *rcvd = &session->bc_attrs; 7106 7107 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 7108 return -EINVAL; 7109 if (rcvd->max_resp_sz < sent->max_resp_sz) 7110 return -EINVAL; 7111 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 7112 return -EINVAL; 7113 /* These would render the backchannel useless: */ 7114 if (rcvd->max_ops != sent->max_ops) 7115 return -EINVAL; 7116 if (rcvd->max_reqs != sent->max_reqs) 7117 return -EINVAL; 7118 return 0; 7119 } 7120 7121 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 7122 struct nfs4_session *session) 7123 { 7124 int ret; 7125 7126 ret = nfs4_verify_fore_channel_attrs(args, session); 7127 if (ret) 7128 return ret; 7129 return nfs4_verify_back_channel_attrs(args, session); 7130 } 7131 7132 static int _nfs4_proc_create_session(struct nfs_client *clp, 7133 struct rpc_cred *cred) 7134 { 7135 struct nfs4_session *session = clp->cl_session; 7136 struct nfs41_create_session_args args = { 7137 .client = clp, 7138 .cb_program = NFS4_CALLBACK, 7139 }; 7140 struct nfs41_create_session_res res = { 7141 .client = clp, 7142 }; 7143 struct rpc_message msg = { 7144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 7145 .rpc_argp = &args, 7146 .rpc_resp = &res, 7147 .rpc_cred = cred, 7148 }; 7149 int status; 7150 7151 nfs4_init_channel_attrs(&args); 7152 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 7153 7154 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7155 trace_nfs4_create_session(clp, status); 7156 7157 if (!status) { 7158 /* Verify the session's negotiated channel_attrs values */ 7159 status = nfs4_verify_channel_attrs(&args, session); 7160 /* Increment the clientid slot sequence id */ 7161 clp->cl_seqid++; 7162 } 7163 7164 return status; 7165 } 7166 7167 /* 7168 * Issues a CREATE_SESSION operation to the server. 7169 * It is the responsibility of the caller to verify the session is 7170 * expired before calling this routine. 7171 */ 7172 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 7173 { 7174 int status; 7175 unsigned *ptr; 7176 struct nfs4_session *session = clp->cl_session; 7177 7178 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 7179 7180 status = _nfs4_proc_create_session(clp, cred); 7181 if (status) 7182 goto out; 7183 7184 /* Init or reset the session slot tables */ 7185 status = nfs4_setup_session_slot_tables(session); 7186 dprintk("slot table setup returned %d\n", status); 7187 if (status) 7188 goto out; 7189 7190 ptr = (unsigned *)&session->sess_id.data[0]; 7191 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 7192 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 7193 out: 7194 dprintk("<-- %s\n", __func__); 7195 return status; 7196 } 7197 7198 /* 7199 * Issue the over-the-wire RPC DESTROY_SESSION. 7200 * The caller must serialize access to this routine. 7201 */ 7202 int nfs4_proc_destroy_session(struct nfs4_session *session, 7203 struct rpc_cred *cred) 7204 { 7205 struct rpc_message msg = { 7206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 7207 .rpc_argp = session, 7208 .rpc_cred = cred, 7209 }; 7210 int status = 0; 7211 7212 dprintk("--> nfs4_proc_destroy_session\n"); 7213 7214 /* session is still being setup */ 7215 if (session->clp->cl_cons_state != NFS_CS_READY) 7216 return status; 7217 7218 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7219 trace_nfs4_destroy_session(session->clp, status); 7220 7221 if (status) 7222 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 7223 "Session has been destroyed regardless...\n", status); 7224 7225 dprintk("<-- nfs4_proc_destroy_session\n"); 7226 return status; 7227 } 7228 7229 /* 7230 * Renew the cl_session lease. 7231 */ 7232 struct nfs4_sequence_data { 7233 struct nfs_client *clp; 7234 struct nfs4_sequence_args args; 7235 struct nfs4_sequence_res res; 7236 }; 7237 7238 static void nfs41_sequence_release(void *data) 7239 { 7240 struct nfs4_sequence_data *calldata = data; 7241 struct nfs_client *clp = calldata->clp; 7242 7243 if (atomic_read(&clp->cl_count) > 1) 7244 nfs4_schedule_state_renewal(clp); 7245 nfs_put_client(clp); 7246 kfree(calldata); 7247 } 7248 7249 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7250 { 7251 switch(task->tk_status) { 7252 case -NFS4ERR_DELAY: 7253 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7254 return -EAGAIN; 7255 default: 7256 nfs4_schedule_lease_recovery(clp); 7257 } 7258 return 0; 7259 } 7260 7261 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 7262 { 7263 struct nfs4_sequence_data *calldata = data; 7264 struct nfs_client *clp = calldata->clp; 7265 7266 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 7267 return; 7268 7269 trace_nfs4_sequence(clp, task->tk_status); 7270 if (task->tk_status < 0) { 7271 dprintk("%s ERROR %d\n", __func__, task->tk_status); 7272 if (atomic_read(&clp->cl_count) == 1) 7273 goto out; 7274 7275 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 7276 rpc_restart_call_prepare(task); 7277 return; 7278 } 7279 } 7280 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 7281 out: 7282 dprintk("<-- %s\n", __func__); 7283 } 7284 7285 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 7286 { 7287 struct nfs4_sequence_data *calldata = data; 7288 struct nfs_client *clp = calldata->clp; 7289 struct nfs4_sequence_args *args; 7290 struct nfs4_sequence_res *res; 7291 7292 args = task->tk_msg.rpc_argp; 7293 res = task->tk_msg.rpc_resp; 7294 7295 nfs41_setup_sequence(clp->cl_session, args, res, task); 7296 } 7297 7298 static const struct rpc_call_ops nfs41_sequence_ops = { 7299 .rpc_call_done = nfs41_sequence_call_done, 7300 .rpc_call_prepare = nfs41_sequence_prepare, 7301 .rpc_release = nfs41_sequence_release, 7302 }; 7303 7304 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 7305 struct rpc_cred *cred, 7306 bool is_privileged) 7307 { 7308 struct nfs4_sequence_data *calldata; 7309 struct rpc_message msg = { 7310 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 7311 .rpc_cred = cred, 7312 }; 7313 struct rpc_task_setup task_setup_data = { 7314 .rpc_client = clp->cl_rpcclient, 7315 .rpc_message = &msg, 7316 .callback_ops = &nfs41_sequence_ops, 7317 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 7318 }; 7319 7320 if (!atomic_inc_not_zero(&clp->cl_count)) 7321 return ERR_PTR(-EIO); 7322 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7323 if (calldata == NULL) { 7324 nfs_put_client(clp); 7325 return ERR_PTR(-ENOMEM); 7326 } 7327 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 7328 if (is_privileged) 7329 nfs4_set_sequence_privileged(&calldata->args); 7330 msg.rpc_argp = &calldata->args; 7331 msg.rpc_resp = &calldata->res; 7332 calldata->clp = clp; 7333 task_setup_data.callback_data = calldata; 7334 7335 return rpc_run_task(&task_setup_data); 7336 } 7337 7338 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 7339 { 7340 struct rpc_task *task; 7341 int ret = 0; 7342 7343 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 7344 return 0; 7345 task = _nfs41_proc_sequence(clp, cred, false); 7346 if (IS_ERR(task)) 7347 ret = PTR_ERR(task); 7348 else 7349 rpc_put_task_async(task); 7350 dprintk("<-- %s status=%d\n", __func__, ret); 7351 return ret; 7352 } 7353 7354 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 7355 { 7356 struct rpc_task *task; 7357 int ret; 7358 7359 task = _nfs41_proc_sequence(clp, cred, true); 7360 if (IS_ERR(task)) { 7361 ret = PTR_ERR(task); 7362 goto out; 7363 } 7364 ret = rpc_wait_for_completion_task(task); 7365 if (!ret) { 7366 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp; 7367 7368 if (task->tk_status == 0) 7369 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 7370 ret = task->tk_status; 7371 } 7372 rpc_put_task(task); 7373 out: 7374 dprintk("<-- %s status=%d\n", __func__, ret); 7375 return ret; 7376 } 7377 7378 struct nfs4_reclaim_complete_data { 7379 struct nfs_client *clp; 7380 struct nfs41_reclaim_complete_args arg; 7381 struct nfs41_reclaim_complete_res res; 7382 }; 7383 7384 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 7385 { 7386 struct nfs4_reclaim_complete_data *calldata = data; 7387 7388 nfs41_setup_sequence(calldata->clp->cl_session, 7389 &calldata->arg.seq_args, 7390 &calldata->res.seq_res, 7391 task); 7392 } 7393 7394 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7395 { 7396 switch(task->tk_status) { 7397 case 0: 7398 case -NFS4ERR_COMPLETE_ALREADY: 7399 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 7400 break; 7401 case -NFS4ERR_DELAY: 7402 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7403 /* fall through */ 7404 case -NFS4ERR_RETRY_UNCACHED_REP: 7405 return -EAGAIN; 7406 default: 7407 nfs4_schedule_lease_recovery(clp); 7408 } 7409 return 0; 7410 } 7411 7412 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 7413 { 7414 struct nfs4_reclaim_complete_data *calldata = data; 7415 struct nfs_client *clp = calldata->clp; 7416 struct nfs4_sequence_res *res = &calldata->res.seq_res; 7417 7418 dprintk("--> %s\n", __func__); 7419 if (!nfs41_sequence_done(task, res)) 7420 return; 7421 7422 trace_nfs4_reclaim_complete(clp, task->tk_status); 7423 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 7424 rpc_restart_call_prepare(task); 7425 return; 7426 } 7427 dprintk("<-- %s\n", __func__); 7428 } 7429 7430 static void nfs4_free_reclaim_complete_data(void *data) 7431 { 7432 struct nfs4_reclaim_complete_data *calldata = data; 7433 7434 kfree(calldata); 7435 } 7436 7437 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 7438 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 7439 .rpc_call_done = nfs4_reclaim_complete_done, 7440 .rpc_release = nfs4_free_reclaim_complete_data, 7441 }; 7442 7443 /* 7444 * Issue a global reclaim complete. 7445 */ 7446 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 7447 struct rpc_cred *cred) 7448 { 7449 struct nfs4_reclaim_complete_data *calldata; 7450 struct rpc_task *task; 7451 struct rpc_message msg = { 7452 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 7453 .rpc_cred = cred, 7454 }; 7455 struct rpc_task_setup task_setup_data = { 7456 .rpc_client = clp->cl_rpcclient, 7457 .rpc_message = &msg, 7458 .callback_ops = &nfs4_reclaim_complete_call_ops, 7459 .flags = RPC_TASK_ASYNC, 7460 }; 7461 int status = -ENOMEM; 7462 7463 dprintk("--> %s\n", __func__); 7464 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7465 if (calldata == NULL) 7466 goto out; 7467 calldata->clp = clp; 7468 calldata->arg.one_fs = 0; 7469 7470 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 7471 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 7472 msg.rpc_argp = &calldata->arg; 7473 msg.rpc_resp = &calldata->res; 7474 task_setup_data.callback_data = calldata; 7475 task = rpc_run_task(&task_setup_data); 7476 if (IS_ERR(task)) { 7477 status = PTR_ERR(task); 7478 goto out; 7479 } 7480 status = nfs4_wait_for_completion_rpc_task(task); 7481 if (status == 0) 7482 status = task->tk_status; 7483 rpc_put_task(task); 7484 return 0; 7485 out: 7486 dprintk("<-- %s status=%d\n", __func__, status); 7487 return status; 7488 } 7489 7490 static void 7491 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 7492 { 7493 struct nfs4_layoutget *lgp = calldata; 7494 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 7495 struct nfs4_session *session = nfs4_get_session(server); 7496 7497 dprintk("--> %s\n", __func__); 7498 /* Note the is a race here, where a CB_LAYOUTRECALL can come in 7499 * right now covering the LAYOUTGET we are about to send. 7500 * However, that is not so catastrophic, and there seems 7501 * to be no way to prevent it completely. 7502 */ 7503 if (nfs41_setup_sequence(session, &lgp->args.seq_args, 7504 &lgp->res.seq_res, task)) 7505 return; 7506 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid, 7507 NFS_I(lgp->args.inode)->layout, 7508 lgp->args.ctx->state)) { 7509 rpc_exit(task, NFS4_OK); 7510 } 7511 } 7512 7513 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 7514 { 7515 struct nfs4_layoutget *lgp = calldata; 7516 struct inode *inode = lgp->args.inode; 7517 struct nfs_server *server = NFS_SERVER(inode); 7518 struct pnfs_layout_hdr *lo; 7519 struct nfs4_state *state = NULL; 7520 unsigned long timeo, now, giveup; 7521 7522 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 7523 7524 if (!nfs41_sequence_done(task, &lgp->res.seq_res)) 7525 goto out; 7526 7527 switch (task->tk_status) { 7528 case 0: 7529 goto out; 7530 /* 7531 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 7532 * (or clients) writing to the same RAID stripe 7533 */ 7534 case -NFS4ERR_LAYOUTTRYLATER: 7535 /* 7536 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall 7537 * existing layout before getting a new one). 7538 */ 7539 case -NFS4ERR_RECALLCONFLICT: 7540 timeo = rpc_get_timeout(task->tk_client); 7541 giveup = lgp->args.timestamp + timeo; 7542 now = jiffies; 7543 if (time_after(giveup, now)) { 7544 unsigned long delay; 7545 7546 /* Delay for: 7547 * - Not less then NFS4_POLL_RETRY_MIN. 7548 * - One last time a jiffie before we give up 7549 * - exponential backoff (time_now minus start_attempt) 7550 */ 7551 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN, 7552 min((giveup - now - 1), 7553 now - lgp->args.timestamp)); 7554 7555 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n", 7556 __func__, delay); 7557 rpc_delay(task, delay); 7558 task->tk_status = 0; 7559 rpc_restart_call_prepare(task); 7560 goto out; /* Do not call nfs4_async_handle_error() */ 7561 } 7562 break; 7563 case -NFS4ERR_EXPIRED: 7564 case -NFS4ERR_BAD_STATEID: 7565 spin_lock(&inode->i_lock); 7566 lo = NFS_I(inode)->layout; 7567 if (!lo || list_empty(&lo->plh_segs)) { 7568 spin_unlock(&inode->i_lock); 7569 /* If the open stateid was bad, then recover it. */ 7570 state = lgp->args.ctx->state; 7571 } else { 7572 LIST_HEAD(head); 7573 7574 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL); 7575 spin_unlock(&inode->i_lock); 7576 /* Mark the bad layout state as invalid, then 7577 * retry using the open stateid. */ 7578 pnfs_free_lseg_list(&head); 7579 } 7580 } 7581 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) 7582 rpc_restart_call_prepare(task); 7583 out: 7584 dprintk("<-- %s\n", __func__); 7585 } 7586 7587 static size_t max_response_pages(struct nfs_server *server) 7588 { 7589 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 7590 return nfs_page_array_len(0, max_resp_sz); 7591 } 7592 7593 static void nfs4_free_pages(struct page **pages, size_t size) 7594 { 7595 int i; 7596 7597 if (!pages) 7598 return; 7599 7600 for (i = 0; i < size; i++) { 7601 if (!pages[i]) 7602 break; 7603 __free_page(pages[i]); 7604 } 7605 kfree(pages); 7606 } 7607 7608 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 7609 { 7610 struct page **pages; 7611 int i; 7612 7613 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 7614 if (!pages) { 7615 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 7616 return NULL; 7617 } 7618 7619 for (i = 0; i < size; i++) { 7620 pages[i] = alloc_page(gfp_flags); 7621 if (!pages[i]) { 7622 dprintk("%s: failed to allocate page\n", __func__); 7623 nfs4_free_pages(pages, size); 7624 return NULL; 7625 } 7626 } 7627 7628 return pages; 7629 } 7630 7631 static void nfs4_layoutget_release(void *calldata) 7632 { 7633 struct nfs4_layoutget *lgp = calldata; 7634 struct inode *inode = lgp->args.inode; 7635 struct nfs_server *server = NFS_SERVER(inode); 7636 size_t max_pages = max_response_pages(server); 7637 7638 dprintk("--> %s\n", __func__); 7639 nfs4_free_pages(lgp->args.layout.pages, max_pages); 7640 pnfs_put_layout_hdr(NFS_I(inode)->layout); 7641 put_nfs_open_context(lgp->args.ctx); 7642 kfree(calldata); 7643 dprintk("<-- %s\n", __func__); 7644 } 7645 7646 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 7647 .rpc_call_prepare = nfs4_layoutget_prepare, 7648 .rpc_call_done = nfs4_layoutget_done, 7649 .rpc_release = nfs4_layoutget_release, 7650 }; 7651 7652 struct pnfs_layout_segment * 7653 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) 7654 { 7655 struct inode *inode = lgp->args.inode; 7656 struct nfs_server *server = NFS_SERVER(inode); 7657 size_t max_pages = max_response_pages(server); 7658 struct rpc_task *task; 7659 struct rpc_message msg = { 7660 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 7661 .rpc_argp = &lgp->args, 7662 .rpc_resp = &lgp->res, 7663 .rpc_cred = lgp->cred, 7664 }; 7665 struct rpc_task_setup task_setup_data = { 7666 .rpc_client = server->client, 7667 .rpc_message = &msg, 7668 .callback_ops = &nfs4_layoutget_call_ops, 7669 .callback_data = lgp, 7670 .flags = RPC_TASK_ASYNC, 7671 }; 7672 struct pnfs_layout_segment *lseg = NULL; 7673 int status = 0; 7674 7675 dprintk("--> %s\n", __func__); 7676 7677 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 7678 if (!lgp->args.layout.pages) { 7679 nfs4_layoutget_release(lgp); 7680 return ERR_PTR(-ENOMEM); 7681 } 7682 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 7683 lgp->args.timestamp = jiffies; 7684 7685 lgp->res.layoutp = &lgp->args.layout; 7686 lgp->res.seq_res.sr_slot = NULL; 7687 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 7688 7689 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 7690 pnfs_get_layout_hdr(NFS_I(inode)->layout); 7691 7692 task = rpc_run_task(&task_setup_data); 7693 if (IS_ERR(task)) 7694 return ERR_CAST(task); 7695 status = nfs4_wait_for_completion_rpc_task(task); 7696 if (status == 0) 7697 status = task->tk_status; 7698 trace_nfs4_layoutget(lgp->args.ctx, 7699 &lgp->args.range, 7700 &lgp->res.range, 7701 status); 7702 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 7703 if (status == 0 && lgp->res.layoutp->len) 7704 lseg = pnfs_layout_process(lgp); 7705 rpc_put_task(task); 7706 dprintk("<-- %s status=%d\n", __func__, status); 7707 if (status) 7708 return ERR_PTR(status); 7709 return lseg; 7710 } 7711 7712 static void 7713 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 7714 { 7715 struct nfs4_layoutreturn *lrp = calldata; 7716 7717 dprintk("--> %s\n", __func__); 7718 nfs41_setup_sequence(lrp->clp->cl_session, 7719 &lrp->args.seq_args, 7720 &lrp->res.seq_res, 7721 task); 7722 } 7723 7724 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 7725 { 7726 struct nfs4_layoutreturn *lrp = calldata; 7727 struct nfs_server *server; 7728 7729 dprintk("--> %s\n", __func__); 7730 7731 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 7732 return; 7733 7734 server = NFS_SERVER(lrp->args.inode); 7735 switch (task->tk_status) { 7736 default: 7737 task->tk_status = 0; 7738 case 0: 7739 break; 7740 case -NFS4ERR_DELAY: 7741 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN) 7742 break; 7743 rpc_restart_call_prepare(task); 7744 return; 7745 } 7746 dprintk("<-- %s\n", __func__); 7747 } 7748 7749 static void nfs4_layoutreturn_release(void *calldata) 7750 { 7751 struct nfs4_layoutreturn *lrp = calldata; 7752 struct pnfs_layout_hdr *lo = lrp->args.layout; 7753 7754 dprintk("--> %s\n", __func__); 7755 spin_lock(&lo->plh_inode->i_lock); 7756 if (lrp->res.lrs_present) 7757 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 7758 lo->plh_block_lgets--; 7759 spin_unlock(&lo->plh_inode->i_lock); 7760 pnfs_put_layout_hdr(lrp->args.layout); 7761 kfree(calldata); 7762 dprintk("<-- %s\n", __func__); 7763 } 7764 7765 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 7766 .rpc_call_prepare = nfs4_layoutreturn_prepare, 7767 .rpc_call_done = nfs4_layoutreturn_done, 7768 .rpc_release = nfs4_layoutreturn_release, 7769 }; 7770 7771 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp) 7772 { 7773 struct rpc_task *task; 7774 struct rpc_message msg = { 7775 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 7776 .rpc_argp = &lrp->args, 7777 .rpc_resp = &lrp->res, 7778 .rpc_cred = lrp->cred, 7779 }; 7780 struct rpc_task_setup task_setup_data = { 7781 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 7782 .rpc_message = &msg, 7783 .callback_ops = &nfs4_layoutreturn_call_ops, 7784 .callback_data = lrp, 7785 }; 7786 int status; 7787 7788 dprintk("--> %s\n", __func__); 7789 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 7790 task = rpc_run_task(&task_setup_data); 7791 if (IS_ERR(task)) 7792 return PTR_ERR(task); 7793 status = task->tk_status; 7794 trace_nfs4_layoutreturn(lrp->args.inode, status); 7795 dprintk("<-- %s status=%d\n", __func__, status); 7796 rpc_put_task(task); 7797 return status; 7798 } 7799 7800 /* 7801 * Retrieve the list of Data Server devices from the MDS. 7802 */ 7803 static int _nfs4_getdevicelist(struct nfs_server *server, 7804 const struct nfs_fh *fh, 7805 struct pnfs_devicelist *devlist) 7806 { 7807 struct nfs4_getdevicelist_args args = { 7808 .fh = fh, 7809 .layoutclass = server->pnfs_curr_ld->id, 7810 }; 7811 struct nfs4_getdevicelist_res res = { 7812 .devlist = devlist, 7813 }; 7814 struct rpc_message msg = { 7815 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST], 7816 .rpc_argp = &args, 7817 .rpc_resp = &res, 7818 }; 7819 int status; 7820 7821 dprintk("--> %s\n", __func__); 7822 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 7823 &res.seq_res, 0); 7824 dprintk("<-- %s status=%d\n", __func__, status); 7825 return status; 7826 } 7827 7828 int nfs4_proc_getdevicelist(struct nfs_server *server, 7829 const struct nfs_fh *fh, 7830 struct pnfs_devicelist *devlist) 7831 { 7832 struct nfs4_exception exception = { }; 7833 int err; 7834 7835 do { 7836 err = nfs4_handle_exception(server, 7837 _nfs4_getdevicelist(server, fh, devlist), 7838 &exception); 7839 } while (exception.retry); 7840 7841 dprintk("%s: err=%d, num_devs=%u\n", __func__, 7842 err, devlist->num_devs); 7843 7844 return err; 7845 } 7846 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist); 7847 7848 static int 7849 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 7850 struct pnfs_device *pdev, 7851 struct rpc_cred *cred) 7852 { 7853 struct nfs4_getdeviceinfo_args args = { 7854 .pdev = pdev, 7855 }; 7856 struct nfs4_getdeviceinfo_res res = { 7857 .pdev = pdev, 7858 }; 7859 struct rpc_message msg = { 7860 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 7861 .rpc_argp = &args, 7862 .rpc_resp = &res, 7863 .rpc_cred = cred, 7864 }; 7865 int status; 7866 7867 dprintk("--> %s\n", __func__); 7868 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 7869 dprintk("<-- %s status=%d\n", __func__, status); 7870 7871 return status; 7872 } 7873 7874 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 7875 struct pnfs_device *pdev, 7876 struct rpc_cred *cred) 7877 { 7878 struct nfs4_exception exception = { }; 7879 int err; 7880 7881 do { 7882 err = nfs4_handle_exception(server, 7883 _nfs4_proc_getdeviceinfo(server, pdev, cred), 7884 &exception); 7885 } while (exception.retry); 7886 return err; 7887 } 7888 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 7889 7890 static void nfs4_layoutcommit_prepare(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 struct nfs4_session *session = nfs4_get_session(server); 7895 7896 nfs41_setup_sequence(session, 7897 &data->args.seq_args, 7898 &data->res.seq_res, 7899 task); 7900 } 7901 7902 static void 7903 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 7904 { 7905 struct nfs4_layoutcommit_data *data = calldata; 7906 struct nfs_server *server = NFS_SERVER(data->args.inode); 7907 7908 if (!nfs41_sequence_done(task, &data->res.seq_res)) 7909 return; 7910 7911 switch (task->tk_status) { /* Just ignore these failures */ 7912 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 7913 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 7914 case -NFS4ERR_BADLAYOUT: /* no layout */ 7915 case -NFS4ERR_GRACE: /* loca_recalim always false */ 7916 task->tk_status = 0; 7917 case 0: 7918 break; 7919 default: 7920 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { 7921 rpc_restart_call_prepare(task); 7922 return; 7923 } 7924 } 7925 } 7926 7927 static void nfs4_layoutcommit_release(void *calldata) 7928 { 7929 struct nfs4_layoutcommit_data *data = calldata; 7930 7931 pnfs_cleanup_layoutcommit(data); 7932 nfs_post_op_update_inode_force_wcc(data->args.inode, 7933 data->res.fattr); 7934 put_rpccred(data->cred); 7935 kfree(data); 7936 } 7937 7938 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 7939 .rpc_call_prepare = nfs4_layoutcommit_prepare, 7940 .rpc_call_done = nfs4_layoutcommit_done, 7941 .rpc_release = nfs4_layoutcommit_release, 7942 }; 7943 7944 int 7945 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 7946 { 7947 struct rpc_message msg = { 7948 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 7949 .rpc_argp = &data->args, 7950 .rpc_resp = &data->res, 7951 .rpc_cred = data->cred, 7952 }; 7953 struct rpc_task_setup task_setup_data = { 7954 .task = &data->task, 7955 .rpc_client = NFS_CLIENT(data->args.inode), 7956 .rpc_message = &msg, 7957 .callback_ops = &nfs4_layoutcommit_ops, 7958 .callback_data = data, 7959 .flags = RPC_TASK_ASYNC, 7960 }; 7961 struct rpc_task *task; 7962 int status = 0; 7963 7964 dprintk("NFS: %4d initiating layoutcommit call. sync %d " 7965 "lbw: %llu inode %lu\n", 7966 data->task.tk_pid, sync, 7967 data->args.lastbytewritten, 7968 data->args.inode->i_ino); 7969 7970 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 7971 task = rpc_run_task(&task_setup_data); 7972 if (IS_ERR(task)) 7973 return PTR_ERR(task); 7974 if (sync == false) 7975 goto out; 7976 status = nfs4_wait_for_completion_rpc_task(task); 7977 if (status != 0) 7978 goto out; 7979 status = task->tk_status; 7980 trace_nfs4_layoutcommit(data->args.inode, status); 7981 out: 7982 dprintk("%s: status %d\n", __func__, status); 7983 rpc_put_task(task); 7984 return status; 7985 } 7986 7987 /** 7988 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 7989 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 7990 */ 7991 static int 7992 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 7993 struct nfs_fsinfo *info, 7994 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7995 { 7996 struct nfs41_secinfo_no_name_args args = { 7997 .style = SECINFO_STYLE_CURRENT_FH, 7998 }; 7999 struct nfs4_secinfo_res res = { 8000 .flavors = flavors, 8001 }; 8002 struct rpc_message msg = { 8003 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 8004 .rpc_argp = &args, 8005 .rpc_resp = &res, 8006 }; 8007 struct rpc_clnt *clnt = server->client; 8008 struct rpc_cred *cred = NULL; 8009 int status; 8010 8011 if (use_integrity) { 8012 clnt = server->nfs_client->cl_rpcclient; 8013 cred = nfs4_get_clid_cred(server->nfs_client); 8014 msg.rpc_cred = cred; 8015 } 8016 8017 dprintk("--> %s\n", __func__); 8018 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 8019 &res.seq_res, 0); 8020 dprintk("<-- %s status=%d\n", __func__, status); 8021 8022 if (cred) 8023 put_rpccred(cred); 8024 8025 return status; 8026 } 8027 8028 static int 8029 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 8030 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 8031 { 8032 struct nfs4_exception exception = { }; 8033 int err; 8034 do { 8035 /* first try using integrity protection */ 8036 err = -NFS4ERR_WRONGSEC; 8037 8038 /* try to use integrity protection with machine cred */ 8039 if (_nfs4_is_integrity_protected(server->nfs_client)) 8040 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8041 flavors, true); 8042 8043 /* 8044 * if unable to use integrity protection, or SECINFO with 8045 * integrity protection returns NFS4ERR_WRONGSEC (which is 8046 * disallowed by spec, but exists in deployed servers) use 8047 * the current filesystem's rpc_client and the user cred. 8048 */ 8049 if (err == -NFS4ERR_WRONGSEC) 8050 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 8051 flavors, false); 8052 8053 switch (err) { 8054 case 0: 8055 case -NFS4ERR_WRONGSEC: 8056 case -ENOTSUPP: 8057 goto out; 8058 default: 8059 err = nfs4_handle_exception(server, err, &exception); 8060 } 8061 } while (exception.retry); 8062 out: 8063 return err; 8064 } 8065 8066 static int 8067 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 8068 struct nfs_fsinfo *info) 8069 { 8070 int err; 8071 struct page *page; 8072 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 8073 struct nfs4_secinfo_flavors *flavors; 8074 struct nfs4_secinfo4 *secinfo; 8075 int i; 8076 8077 page = alloc_page(GFP_KERNEL); 8078 if (!page) { 8079 err = -ENOMEM; 8080 goto out; 8081 } 8082 8083 flavors = page_address(page); 8084 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 8085 8086 /* 8087 * Fall back on "guess and check" method if 8088 * the server doesn't support SECINFO_NO_NAME 8089 */ 8090 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 8091 err = nfs4_find_root_sec(server, fhandle, info); 8092 goto out_freepage; 8093 } 8094 if (err) 8095 goto out_freepage; 8096 8097 for (i = 0; i < flavors->num_flavors; i++) { 8098 secinfo = &flavors->flavors[i]; 8099 8100 switch (secinfo->flavor) { 8101 case RPC_AUTH_NULL: 8102 case RPC_AUTH_UNIX: 8103 case RPC_AUTH_GSS: 8104 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 8105 &secinfo->flavor_info); 8106 break; 8107 default: 8108 flavor = RPC_AUTH_MAXFLAVOR; 8109 break; 8110 } 8111 8112 if (!nfs_auth_info_match(&server->auth_info, flavor)) 8113 flavor = RPC_AUTH_MAXFLAVOR; 8114 8115 if (flavor != RPC_AUTH_MAXFLAVOR) { 8116 err = nfs4_lookup_root_sec(server, fhandle, 8117 info, flavor); 8118 if (!err) 8119 break; 8120 } 8121 } 8122 8123 if (flavor == RPC_AUTH_MAXFLAVOR) 8124 err = -EPERM; 8125 8126 out_freepage: 8127 put_page(page); 8128 if (err == -EACCES) 8129 return -EPERM; 8130 out: 8131 return err; 8132 } 8133 8134 static int _nfs41_test_stateid(struct nfs_server *server, 8135 nfs4_stateid *stateid, 8136 struct rpc_cred *cred) 8137 { 8138 int status; 8139 struct nfs41_test_stateid_args args = { 8140 .stateid = stateid, 8141 }; 8142 struct nfs41_test_stateid_res res; 8143 struct rpc_message msg = { 8144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 8145 .rpc_argp = &args, 8146 .rpc_resp = &res, 8147 .rpc_cred = cred, 8148 }; 8149 struct rpc_clnt *rpc_client = server->client; 8150 8151 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8152 &rpc_client, &msg); 8153 8154 dprintk("NFS call test_stateid %p\n", stateid); 8155 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 8156 nfs4_set_sequence_privileged(&args.seq_args); 8157 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 8158 &args.seq_args, &res.seq_res); 8159 if (status != NFS_OK) { 8160 dprintk("NFS reply test_stateid: failed, %d\n", status); 8161 return status; 8162 } 8163 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 8164 return -res.status; 8165 } 8166 8167 /** 8168 * nfs41_test_stateid - perform a TEST_STATEID operation 8169 * 8170 * @server: server / transport on which to perform the operation 8171 * @stateid: state ID to test 8172 * @cred: credential 8173 * 8174 * Returns NFS_OK if the server recognizes that "stateid" is valid. 8175 * Otherwise a negative NFS4ERR value is returned if the operation 8176 * failed or the state ID is not currently valid. 8177 */ 8178 static int nfs41_test_stateid(struct nfs_server *server, 8179 nfs4_stateid *stateid, 8180 struct rpc_cred *cred) 8181 { 8182 struct nfs4_exception exception = { }; 8183 int err; 8184 do { 8185 err = _nfs41_test_stateid(server, stateid, cred); 8186 if (err != -NFS4ERR_DELAY) 8187 break; 8188 nfs4_handle_exception(server, err, &exception); 8189 } while (exception.retry); 8190 return err; 8191 } 8192 8193 struct nfs_free_stateid_data { 8194 struct nfs_server *server; 8195 struct nfs41_free_stateid_args args; 8196 struct nfs41_free_stateid_res res; 8197 }; 8198 8199 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 8200 { 8201 struct nfs_free_stateid_data *data = calldata; 8202 nfs41_setup_sequence(nfs4_get_session(data->server), 8203 &data->args.seq_args, 8204 &data->res.seq_res, 8205 task); 8206 } 8207 8208 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 8209 { 8210 struct nfs_free_stateid_data *data = calldata; 8211 8212 nfs41_sequence_done(task, &data->res.seq_res); 8213 8214 switch (task->tk_status) { 8215 case -NFS4ERR_DELAY: 8216 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN) 8217 rpc_restart_call_prepare(task); 8218 } 8219 } 8220 8221 static void nfs41_free_stateid_release(void *calldata) 8222 { 8223 kfree(calldata); 8224 } 8225 8226 static const struct rpc_call_ops nfs41_free_stateid_ops = { 8227 .rpc_call_prepare = nfs41_free_stateid_prepare, 8228 .rpc_call_done = nfs41_free_stateid_done, 8229 .rpc_release = nfs41_free_stateid_release, 8230 }; 8231 8232 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 8233 nfs4_stateid *stateid, 8234 struct rpc_cred *cred, 8235 bool privileged) 8236 { 8237 struct rpc_message msg = { 8238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 8239 .rpc_cred = cred, 8240 }; 8241 struct rpc_task_setup task_setup = { 8242 .rpc_client = server->client, 8243 .rpc_message = &msg, 8244 .callback_ops = &nfs41_free_stateid_ops, 8245 .flags = RPC_TASK_ASYNC, 8246 }; 8247 struct nfs_free_stateid_data *data; 8248 8249 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8250 &task_setup.rpc_client, &msg); 8251 8252 dprintk("NFS call free_stateid %p\n", stateid); 8253 data = kmalloc(sizeof(*data), GFP_NOFS); 8254 if (!data) 8255 return ERR_PTR(-ENOMEM); 8256 data->server = server; 8257 nfs4_stateid_copy(&data->args.stateid, stateid); 8258 8259 task_setup.callback_data = data; 8260 8261 msg.rpc_argp = &data->args; 8262 msg.rpc_resp = &data->res; 8263 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 8264 if (privileged) 8265 nfs4_set_sequence_privileged(&data->args.seq_args); 8266 8267 return rpc_run_task(&task_setup); 8268 } 8269 8270 /** 8271 * nfs41_free_stateid - perform a FREE_STATEID operation 8272 * 8273 * @server: server / transport on which to perform the operation 8274 * @stateid: state ID to release 8275 * @cred: credential 8276 * 8277 * Returns NFS_OK if the server freed "stateid". Otherwise a 8278 * negative NFS4ERR value is returned. 8279 */ 8280 static int nfs41_free_stateid(struct nfs_server *server, 8281 nfs4_stateid *stateid, 8282 struct rpc_cred *cred) 8283 { 8284 struct rpc_task *task; 8285 int ret; 8286 8287 task = _nfs41_free_stateid(server, stateid, cred, true); 8288 if (IS_ERR(task)) 8289 return PTR_ERR(task); 8290 ret = rpc_wait_for_completion_task(task); 8291 if (!ret) 8292 ret = task->tk_status; 8293 rpc_put_task(task); 8294 return ret; 8295 } 8296 8297 static void 8298 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 8299 { 8300 struct rpc_task *task; 8301 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 8302 8303 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 8304 nfs4_free_lock_state(server, lsp); 8305 if (IS_ERR(task)) 8306 return; 8307 rpc_put_task(task); 8308 } 8309 8310 static bool nfs41_match_stateid(const nfs4_stateid *s1, 8311 const nfs4_stateid *s2) 8312 { 8313 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 8314 return false; 8315 8316 if (s1->seqid == s2->seqid) 8317 return true; 8318 if (s1->seqid == 0 || s2->seqid == 0) 8319 return true; 8320 8321 return false; 8322 } 8323 8324 #endif /* CONFIG_NFS_V4_1 */ 8325 8326 static bool nfs4_match_stateid(const nfs4_stateid *s1, 8327 const nfs4_stateid *s2) 8328 { 8329 return nfs4_stateid_match(s1, s2); 8330 } 8331 8332 8333 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 8334 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8335 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8336 .recover_open = nfs4_open_reclaim, 8337 .recover_lock = nfs4_lock_reclaim, 8338 .establish_clid = nfs4_init_clientid, 8339 .detect_trunking = nfs40_discover_server_trunking, 8340 }; 8341 8342 #if defined(CONFIG_NFS_V4_1) 8343 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 8344 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8345 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8346 .recover_open = nfs4_open_reclaim, 8347 .recover_lock = nfs4_lock_reclaim, 8348 .establish_clid = nfs41_init_clientid, 8349 .reclaim_complete = nfs41_proc_reclaim_complete, 8350 .detect_trunking = nfs41_discover_server_trunking, 8351 }; 8352 #endif /* CONFIG_NFS_V4_1 */ 8353 8354 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 8355 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8356 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8357 .recover_open = nfs4_open_expired, 8358 .recover_lock = nfs4_lock_expired, 8359 .establish_clid = nfs4_init_clientid, 8360 }; 8361 8362 #if defined(CONFIG_NFS_V4_1) 8363 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 8364 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8365 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8366 .recover_open = nfs41_open_expired, 8367 .recover_lock = nfs41_lock_expired, 8368 .establish_clid = nfs41_init_clientid, 8369 }; 8370 #endif /* CONFIG_NFS_V4_1 */ 8371 8372 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 8373 .sched_state_renewal = nfs4_proc_async_renew, 8374 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 8375 .renew_lease = nfs4_proc_renew, 8376 }; 8377 8378 #if defined(CONFIG_NFS_V4_1) 8379 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 8380 .sched_state_renewal = nfs41_proc_async_sequence, 8381 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 8382 .renew_lease = nfs4_proc_sequence, 8383 }; 8384 #endif 8385 8386 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 8387 .get_locations = _nfs40_proc_get_locations, 8388 .fsid_present = _nfs40_proc_fsid_present, 8389 }; 8390 8391 #if defined(CONFIG_NFS_V4_1) 8392 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 8393 .get_locations = _nfs41_proc_get_locations, 8394 .fsid_present = _nfs41_proc_fsid_present, 8395 }; 8396 #endif /* CONFIG_NFS_V4_1 */ 8397 8398 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 8399 .minor_version = 0, 8400 .init_caps = NFS_CAP_READDIRPLUS 8401 | NFS_CAP_ATOMIC_OPEN 8402 | NFS_CAP_CHANGE_ATTR 8403 | NFS_CAP_POSIX_LOCK, 8404 .init_client = nfs40_init_client, 8405 .shutdown_client = nfs40_shutdown_client, 8406 .match_stateid = nfs4_match_stateid, 8407 .find_root_sec = nfs4_find_root_sec, 8408 .free_lock_state = nfs4_release_lockowner, 8409 .call_sync_ops = &nfs40_call_sync_ops, 8410 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 8411 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 8412 .state_renewal_ops = &nfs40_state_renewal_ops, 8413 .mig_recovery_ops = &nfs40_mig_recovery_ops, 8414 }; 8415 8416 #if defined(CONFIG_NFS_V4_1) 8417 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 8418 .minor_version = 1, 8419 .init_caps = NFS_CAP_READDIRPLUS 8420 | NFS_CAP_ATOMIC_OPEN 8421 | NFS_CAP_CHANGE_ATTR 8422 | NFS_CAP_POSIX_LOCK 8423 | NFS_CAP_STATEID_NFSV41 8424 | NFS_CAP_ATOMIC_OPEN_V1, 8425 .init_client = nfs41_init_client, 8426 .shutdown_client = nfs41_shutdown_client, 8427 .match_stateid = nfs41_match_stateid, 8428 .find_root_sec = nfs41_find_root_sec, 8429 .free_lock_state = nfs41_free_lock_state, 8430 .call_sync_ops = &nfs41_call_sync_ops, 8431 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8432 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8433 .state_renewal_ops = &nfs41_state_renewal_ops, 8434 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8435 }; 8436 #endif 8437 8438 #if defined(CONFIG_NFS_V4_2) 8439 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 8440 .minor_version = 2, 8441 .init_caps = NFS_CAP_READDIRPLUS 8442 | NFS_CAP_ATOMIC_OPEN 8443 | NFS_CAP_CHANGE_ATTR 8444 | NFS_CAP_POSIX_LOCK 8445 | NFS_CAP_STATEID_NFSV41 8446 | NFS_CAP_ATOMIC_OPEN_V1, 8447 .init_client = nfs41_init_client, 8448 .shutdown_client = nfs41_shutdown_client, 8449 .match_stateid = nfs41_match_stateid, 8450 .find_root_sec = nfs41_find_root_sec, 8451 .free_lock_state = nfs41_free_lock_state, 8452 .call_sync_ops = &nfs41_call_sync_ops, 8453 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8454 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8455 .state_renewal_ops = &nfs41_state_renewal_ops, 8456 }; 8457 #endif 8458 8459 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 8460 [0] = &nfs_v4_0_minor_ops, 8461 #if defined(CONFIG_NFS_V4_1) 8462 [1] = &nfs_v4_1_minor_ops, 8463 #endif 8464 #if defined(CONFIG_NFS_V4_2) 8465 [2] = &nfs_v4_2_minor_ops, 8466 #endif 8467 }; 8468 8469 static const struct inode_operations nfs4_dir_inode_operations = { 8470 .create = nfs_create, 8471 .lookup = nfs_lookup, 8472 .atomic_open = nfs_atomic_open, 8473 .link = nfs_link, 8474 .unlink = nfs_unlink, 8475 .symlink = nfs_symlink, 8476 .mkdir = nfs_mkdir, 8477 .rmdir = nfs_rmdir, 8478 .mknod = nfs_mknod, 8479 .rename = nfs_rename, 8480 .permission = nfs_permission, 8481 .getattr = nfs_getattr, 8482 .setattr = nfs_setattr, 8483 .getxattr = generic_getxattr, 8484 .setxattr = generic_setxattr, 8485 .listxattr = generic_listxattr, 8486 .removexattr = generic_removexattr, 8487 }; 8488 8489 static const struct inode_operations nfs4_file_inode_operations = { 8490 .permission = nfs_permission, 8491 .getattr = nfs_getattr, 8492 .setattr = nfs_setattr, 8493 .getxattr = generic_getxattr, 8494 .setxattr = generic_setxattr, 8495 .listxattr = generic_listxattr, 8496 .removexattr = generic_removexattr, 8497 }; 8498 8499 const struct nfs_rpc_ops nfs_v4_clientops = { 8500 .version = 4, /* protocol version */ 8501 .dentry_ops = &nfs4_dentry_operations, 8502 .dir_inode_ops = &nfs4_dir_inode_operations, 8503 .file_inode_ops = &nfs4_file_inode_operations, 8504 .file_ops = &nfs4_file_operations, 8505 .getroot = nfs4_proc_get_root, 8506 .submount = nfs4_submount, 8507 .try_mount = nfs4_try_mount, 8508 .getattr = nfs4_proc_getattr, 8509 .setattr = nfs4_proc_setattr, 8510 .lookup = nfs4_proc_lookup, 8511 .access = nfs4_proc_access, 8512 .readlink = nfs4_proc_readlink, 8513 .create = nfs4_proc_create, 8514 .remove = nfs4_proc_remove, 8515 .unlink_setup = nfs4_proc_unlink_setup, 8516 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 8517 .unlink_done = nfs4_proc_unlink_done, 8518 .rename_setup = nfs4_proc_rename_setup, 8519 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 8520 .rename_done = nfs4_proc_rename_done, 8521 .link = nfs4_proc_link, 8522 .symlink = nfs4_proc_symlink, 8523 .mkdir = nfs4_proc_mkdir, 8524 .rmdir = nfs4_proc_remove, 8525 .readdir = nfs4_proc_readdir, 8526 .mknod = nfs4_proc_mknod, 8527 .statfs = nfs4_proc_statfs, 8528 .fsinfo = nfs4_proc_fsinfo, 8529 .pathconf = nfs4_proc_pathconf, 8530 .set_capabilities = nfs4_server_capabilities, 8531 .decode_dirent = nfs4_decode_dirent, 8532 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 8533 .read_setup = nfs4_proc_read_setup, 8534 .read_done = nfs4_read_done, 8535 .write_setup = nfs4_proc_write_setup, 8536 .write_done = nfs4_write_done, 8537 .commit_setup = nfs4_proc_commit_setup, 8538 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 8539 .commit_done = nfs4_commit_done, 8540 .lock = nfs4_proc_lock, 8541 .clear_acl_cache = nfs4_zap_acl_attr, 8542 .close_context = nfs4_close_context, 8543 .open_context = nfs4_atomic_open, 8544 .have_delegation = nfs4_have_delegation, 8545 .return_delegation = nfs4_inode_return_delegation, 8546 .alloc_client = nfs4_alloc_client, 8547 .init_client = nfs4_init_client, 8548 .free_client = nfs4_free_client, 8549 .create_server = nfs4_create_server, 8550 .clone_server = nfs_clone_server, 8551 }; 8552 8553 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 8554 .prefix = XATTR_NAME_NFSV4_ACL, 8555 .list = nfs4_xattr_list_nfs4_acl, 8556 .get = nfs4_xattr_get_nfs4_acl, 8557 .set = nfs4_xattr_set_nfs4_acl, 8558 }; 8559 8560 const struct xattr_handler *nfs4_xattr_handlers[] = { 8561 &nfs4_xattr_nfs4_acl_handler, 8562 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 8563 &nfs4_xattr_nfs4_label_handler, 8564 #endif 8565 NULL 8566 }; 8567 8568 /* 8569 * Local variables: 8570 * c-basic-offset: 8 8571 * End: 8572 */ 8573