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 static int nfs4_opendata_access(struct rpc_cred *cred, 1956 struct nfs4_opendata *opendata, 1957 struct nfs4_state *state, fmode_t fmode, 1958 int openflags) 1959 { 1960 struct nfs_access_entry cache; 1961 u32 mask; 1962 1963 /* access call failed or for some reason the server doesn't 1964 * support any access modes -- defer access call until later */ 1965 if (opendata->o_res.access_supported == 0) 1966 return 0; 1967 1968 mask = 0; 1969 /* don't check MAY_WRITE - a newly created file may not have 1970 * write mode bits, but POSIX allows the creating process to write. 1971 * use openflags to check for exec, because fmode won't 1972 * always have FMODE_EXEC set when file open for exec. */ 1973 if (openflags & __FMODE_EXEC) { 1974 /* ONLY check for exec rights */ 1975 mask = MAY_EXEC; 1976 } else if (fmode & FMODE_READ) 1977 mask = MAY_READ; 1978 1979 cache.cred = cred; 1980 cache.jiffies = jiffies; 1981 nfs_access_set_mask(&cache, opendata->o_res.access_result); 1982 nfs_access_add_cache(state->inode, &cache); 1983 1984 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 1985 return 0; 1986 1987 /* even though OPEN succeeded, access is denied. Close the file */ 1988 nfs4_close_state(state, fmode); 1989 return -EACCES; 1990 } 1991 1992 /* 1993 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 1994 */ 1995 static int _nfs4_proc_open(struct nfs4_opendata *data) 1996 { 1997 struct inode *dir = data->dir->d_inode; 1998 struct nfs_server *server = NFS_SERVER(dir); 1999 struct nfs_openargs *o_arg = &data->o_arg; 2000 struct nfs_openres *o_res = &data->o_res; 2001 int status; 2002 2003 status = nfs4_run_open_task(data, 0); 2004 if (!data->rpc_done) 2005 return status; 2006 if (status != 0) { 2007 if (status == -NFS4ERR_BADNAME && 2008 !(o_arg->open_flags & O_CREAT)) 2009 return -ENOENT; 2010 return status; 2011 } 2012 2013 nfs_fattr_map_and_free_names(server, &data->f_attr); 2014 2015 if (o_arg->open_flags & O_CREAT) { 2016 update_changeattr(dir, &o_res->cinfo); 2017 if (o_arg->open_flags & O_EXCL) 2018 data->file_created = 1; 2019 else if (o_res->cinfo.before != o_res->cinfo.after) 2020 data->file_created = 1; 2021 } 2022 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2023 server->caps &= ~NFS_CAP_POSIX_LOCK; 2024 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2025 status = _nfs4_proc_open_confirm(data); 2026 if (status != 0) 2027 return status; 2028 } 2029 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 2030 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); 2031 return 0; 2032 } 2033 2034 static int nfs4_recover_expired_lease(struct nfs_server *server) 2035 { 2036 return nfs4_client_recover_expired_lease(server->nfs_client); 2037 } 2038 2039 /* 2040 * OPEN_EXPIRED: 2041 * reclaim state on the server after a network partition. 2042 * Assumes caller holds the appropriate lock 2043 */ 2044 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2045 { 2046 struct nfs4_opendata *opendata; 2047 int ret; 2048 2049 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2050 NFS4_OPEN_CLAIM_FH); 2051 if (IS_ERR(opendata)) 2052 return PTR_ERR(opendata); 2053 ret = nfs4_open_recover(opendata, state); 2054 if (ret == -ESTALE) 2055 d_drop(ctx->dentry); 2056 nfs4_opendata_put(opendata); 2057 return ret; 2058 } 2059 2060 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2061 { 2062 struct nfs_server *server = NFS_SERVER(state->inode); 2063 struct nfs4_exception exception = { }; 2064 int err; 2065 2066 do { 2067 err = _nfs4_open_expired(ctx, state); 2068 trace_nfs4_open_expired(ctx, 0, err); 2069 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2070 continue; 2071 switch (err) { 2072 default: 2073 goto out; 2074 case -NFS4ERR_GRACE: 2075 case -NFS4ERR_DELAY: 2076 nfs4_handle_exception(server, err, &exception); 2077 err = 0; 2078 } 2079 } while (exception.retry); 2080 out: 2081 return err; 2082 } 2083 2084 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2085 { 2086 struct nfs_open_context *ctx; 2087 int ret; 2088 2089 ctx = nfs4_state_find_open_context(state); 2090 if (IS_ERR(ctx)) 2091 return -EAGAIN; 2092 ret = nfs4_do_open_expired(ctx, state); 2093 put_nfs_open_context(ctx); 2094 return ret; 2095 } 2096 2097 #if defined(CONFIG_NFS_V4_1) 2098 static void nfs41_clear_delegation_stateid(struct nfs4_state *state) 2099 { 2100 struct nfs_server *server = NFS_SERVER(state->inode); 2101 nfs4_stateid *stateid = &state->stateid; 2102 struct nfs_delegation *delegation; 2103 struct rpc_cred *cred = NULL; 2104 int status = -NFS4ERR_BAD_STATEID; 2105 2106 /* If a state reset has been done, test_stateid is unneeded */ 2107 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2108 return; 2109 2110 /* Get the delegation credential for use by test/free_stateid */ 2111 rcu_read_lock(); 2112 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2113 if (delegation != NULL && 2114 nfs4_stateid_match(&delegation->stateid, stateid)) { 2115 cred = get_rpccred(delegation->cred); 2116 rcu_read_unlock(); 2117 status = nfs41_test_stateid(server, stateid, cred); 2118 trace_nfs4_test_delegation_stateid(state, NULL, status); 2119 } else 2120 rcu_read_unlock(); 2121 2122 if (status != NFS_OK) { 2123 /* Free the stateid unless the server explicitly 2124 * informs us the stateid is unrecognized. */ 2125 if (status != -NFS4ERR_BAD_STATEID) 2126 nfs41_free_stateid(server, stateid, cred); 2127 nfs_remove_bad_delegation(state->inode); 2128 2129 write_seqlock(&state->seqlock); 2130 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2131 write_sequnlock(&state->seqlock); 2132 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2133 } 2134 2135 if (cred != NULL) 2136 put_rpccred(cred); 2137 } 2138 2139 /** 2140 * nfs41_check_open_stateid - possibly free an open stateid 2141 * 2142 * @state: NFSv4 state for an inode 2143 * 2144 * Returns NFS_OK if recovery for this stateid is now finished. 2145 * Otherwise a negative NFS4ERR value is returned. 2146 */ 2147 static int nfs41_check_open_stateid(struct nfs4_state *state) 2148 { 2149 struct nfs_server *server = NFS_SERVER(state->inode); 2150 nfs4_stateid *stateid = &state->open_stateid; 2151 struct rpc_cred *cred = state->owner->so_cred; 2152 int status; 2153 2154 /* If a state reset has been done, test_stateid is unneeded */ 2155 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 2156 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 2157 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 2158 return -NFS4ERR_BAD_STATEID; 2159 2160 status = nfs41_test_stateid(server, stateid, cred); 2161 trace_nfs4_test_open_stateid(state, NULL, status); 2162 if (status != NFS_OK) { 2163 /* Free the stateid unless the server explicitly 2164 * informs us the stateid is unrecognized. */ 2165 if (status != -NFS4ERR_BAD_STATEID) 2166 nfs41_free_stateid(server, stateid, cred); 2167 2168 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2169 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2170 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2171 clear_bit(NFS_OPEN_STATE, &state->flags); 2172 } 2173 return status; 2174 } 2175 2176 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2177 { 2178 int status; 2179 2180 nfs41_clear_delegation_stateid(state); 2181 status = nfs41_check_open_stateid(state); 2182 if (status != NFS_OK) 2183 status = nfs4_open_expired(sp, state); 2184 return status; 2185 } 2186 #endif 2187 2188 /* 2189 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2190 * fields corresponding to attributes that were used to store the verifier. 2191 * Make sure we clobber those fields in the later setattr call 2192 */ 2193 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 2194 { 2195 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 2196 !(sattr->ia_valid & ATTR_ATIME_SET)) 2197 sattr->ia_valid |= ATTR_ATIME; 2198 2199 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 2200 !(sattr->ia_valid & ATTR_MTIME_SET)) 2201 sattr->ia_valid |= ATTR_MTIME; 2202 } 2203 2204 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 2205 fmode_t fmode, 2206 int flags, 2207 struct nfs_open_context *ctx) 2208 { 2209 struct nfs4_state_owner *sp = opendata->owner; 2210 struct nfs_server *server = sp->so_server; 2211 struct dentry *dentry; 2212 struct nfs4_state *state; 2213 unsigned int seq; 2214 int ret; 2215 2216 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 2217 2218 ret = _nfs4_proc_open(opendata); 2219 if (ret != 0) 2220 goto out; 2221 2222 state = nfs4_opendata_to_nfs4_state(opendata); 2223 ret = PTR_ERR(state); 2224 if (IS_ERR(state)) 2225 goto out; 2226 if (server->caps & NFS_CAP_POSIX_LOCK) 2227 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 2228 2229 dentry = opendata->dentry; 2230 if (dentry->d_inode == NULL) { 2231 /* FIXME: Is this d_drop() ever needed? */ 2232 d_drop(dentry); 2233 dentry = d_add_unique(dentry, igrab(state->inode)); 2234 if (dentry == NULL) { 2235 dentry = opendata->dentry; 2236 } else if (dentry != ctx->dentry) { 2237 dput(ctx->dentry); 2238 ctx->dentry = dget(dentry); 2239 } 2240 nfs_set_verifier(dentry, 2241 nfs_save_change_attribute(opendata->dir->d_inode)); 2242 } 2243 2244 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); 2245 if (ret != 0) 2246 goto out; 2247 2248 ctx->state = state; 2249 if (dentry->d_inode == state->inode) { 2250 nfs_inode_attach_open_context(ctx); 2251 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 2252 nfs4_schedule_stateid_recovery(server, state); 2253 } 2254 out: 2255 return ret; 2256 } 2257 2258 /* 2259 * Returns a referenced nfs4_state 2260 */ 2261 static int _nfs4_do_open(struct inode *dir, 2262 struct nfs_open_context *ctx, 2263 int flags, 2264 struct iattr *sattr, 2265 struct nfs4_label *label, 2266 int *opened) 2267 { 2268 struct nfs4_state_owner *sp; 2269 struct nfs4_state *state = NULL; 2270 struct nfs_server *server = NFS_SERVER(dir); 2271 struct nfs4_opendata *opendata; 2272 struct dentry *dentry = ctx->dentry; 2273 struct rpc_cred *cred = ctx->cred; 2274 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 2275 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 2276 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 2277 struct nfs4_label *olabel = NULL; 2278 int status; 2279 2280 /* Protect against reboot recovery conflicts */ 2281 status = -ENOMEM; 2282 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 2283 if (sp == NULL) { 2284 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 2285 goto out_err; 2286 } 2287 status = nfs4_recover_expired_lease(server); 2288 if (status != 0) 2289 goto err_put_state_owner; 2290 if (dentry->d_inode != NULL) 2291 nfs4_return_incompatible_delegation(dentry->d_inode, fmode); 2292 status = -ENOMEM; 2293 if (dentry->d_inode) 2294 claim = NFS4_OPEN_CLAIM_FH; 2295 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, 2296 label, claim, GFP_KERNEL); 2297 if (opendata == NULL) 2298 goto err_put_state_owner; 2299 2300 if (label) { 2301 olabel = nfs4_label_alloc(server, GFP_KERNEL); 2302 if (IS_ERR(olabel)) { 2303 status = PTR_ERR(olabel); 2304 goto err_opendata_put; 2305 } 2306 } 2307 2308 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 2309 if (!opendata->f_attr.mdsthreshold) { 2310 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 2311 if (!opendata->f_attr.mdsthreshold) 2312 goto err_free_label; 2313 } 2314 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 2315 } 2316 if (dentry->d_inode != NULL) 2317 opendata->state = nfs4_get_open_state(dentry->d_inode, sp); 2318 2319 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); 2320 if (status != 0) 2321 goto err_free_label; 2322 state = ctx->state; 2323 2324 if ((opendata->o_arg.open_flags & O_EXCL) && 2325 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 2326 nfs4_exclusive_attrset(opendata, sattr); 2327 2328 nfs_fattr_init(opendata->o_res.f_attr); 2329 status = nfs4_do_setattr(state->inode, cred, 2330 opendata->o_res.f_attr, sattr, 2331 state, label, olabel); 2332 if (status == 0) { 2333 nfs_setattr_update_inode(state->inode, sattr); 2334 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr); 2335 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); 2336 } 2337 } 2338 if (opendata->file_created) 2339 *opened |= FILE_CREATED; 2340 2341 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 2342 *ctx_th = opendata->f_attr.mdsthreshold; 2343 opendata->f_attr.mdsthreshold = NULL; 2344 } 2345 2346 nfs4_label_free(olabel); 2347 2348 nfs4_opendata_put(opendata); 2349 nfs4_put_state_owner(sp); 2350 return 0; 2351 err_free_label: 2352 nfs4_label_free(olabel); 2353 err_opendata_put: 2354 nfs4_opendata_put(opendata); 2355 err_put_state_owner: 2356 nfs4_put_state_owner(sp); 2357 out_err: 2358 return status; 2359 } 2360 2361 2362 static struct nfs4_state *nfs4_do_open(struct inode *dir, 2363 struct nfs_open_context *ctx, 2364 int flags, 2365 struct iattr *sattr, 2366 struct nfs4_label *label, 2367 int *opened) 2368 { 2369 struct nfs_server *server = NFS_SERVER(dir); 2370 struct nfs4_exception exception = { }; 2371 struct nfs4_state *res; 2372 int status; 2373 2374 do { 2375 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened); 2376 res = ctx->state; 2377 trace_nfs4_open_file(ctx, flags, status); 2378 if (status == 0) 2379 break; 2380 /* NOTE: BAD_SEQID means the server and client disagree about the 2381 * book-keeping w.r.t. state-changing operations 2382 * (OPEN/CLOSE/LOCK/LOCKU...) 2383 * It is actually a sign of a bug on the client or on the server. 2384 * 2385 * If we receive a BAD_SEQID error in the particular case of 2386 * doing an OPEN, we assume that nfs_increment_open_seqid() will 2387 * have unhashed the old state_owner for us, and that we can 2388 * therefore safely retry using a new one. We should still warn 2389 * the user though... 2390 */ 2391 if (status == -NFS4ERR_BAD_SEQID) { 2392 pr_warn_ratelimited("NFS: v4 server %s " 2393 " returned a bad sequence-id error!\n", 2394 NFS_SERVER(dir)->nfs_client->cl_hostname); 2395 exception.retry = 1; 2396 continue; 2397 } 2398 /* 2399 * BAD_STATEID on OPEN means that the server cancelled our 2400 * state before it received the OPEN_CONFIRM. 2401 * Recover by retrying the request as per the discussion 2402 * on Page 181 of RFC3530. 2403 */ 2404 if (status == -NFS4ERR_BAD_STATEID) { 2405 exception.retry = 1; 2406 continue; 2407 } 2408 if (status == -EAGAIN) { 2409 /* We must have found a delegation */ 2410 exception.retry = 1; 2411 continue; 2412 } 2413 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 2414 continue; 2415 res = ERR_PTR(nfs4_handle_exception(server, 2416 status, &exception)); 2417 } while (exception.retry); 2418 return res; 2419 } 2420 2421 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2422 struct nfs_fattr *fattr, struct iattr *sattr, 2423 struct nfs4_state *state, struct nfs4_label *ilabel, 2424 struct nfs4_label *olabel) 2425 { 2426 struct nfs_server *server = NFS_SERVER(inode); 2427 struct nfs_setattrargs arg = { 2428 .fh = NFS_FH(inode), 2429 .iap = sattr, 2430 .server = server, 2431 .bitmask = server->attr_bitmask, 2432 .label = ilabel, 2433 }; 2434 struct nfs_setattrres res = { 2435 .fattr = fattr, 2436 .label = olabel, 2437 .server = server, 2438 }; 2439 struct rpc_message msg = { 2440 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2441 .rpc_argp = &arg, 2442 .rpc_resp = &res, 2443 .rpc_cred = cred, 2444 }; 2445 unsigned long timestamp = jiffies; 2446 fmode_t fmode; 2447 bool truncate; 2448 int status; 2449 2450 arg.bitmask = nfs4_bitmask(server, ilabel); 2451 if (ilabel) 2452 arg.bitmask = nfs4_bitmask(server, olabel); 2453 2454 nfs_fattr_init(fattr); 2455 2456 /* Servers should only apply open mode checks for file size changes */ 2457 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false; 2458 fmode = truncate ? FMODE_WRITE : FMODE_READ; 2459 2460 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) { 2461 /* Use that stateid */ 2462 } else if (truncate && state != NULL) { 2463 struct nfs_lockowner lockowner = { 2464 .l_owner = current->files, 2465 .l_pid = current->tgid, 2466 }; 2467 if (!nfs4_valid_open_stateid(state)) 2468 return -EBADF; 2469 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE, 2470 &lockowner) == -EIO) 2471 return -EBADF; 2472 } else 2473 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 2474 2475 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 2476 if (status == 0 && state != NULL) 2477 renew_lease(server, timestamp); 2478 return status; 2479 } 2480 2481 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2482 struct nfs_fattr *fattr, struct iattr *sattr, 2483 struct nfs4_state *state, struct nfs4_label *ilabel, 2484 struct nfs4_label *olabel) 2485 { 2486 struct nfs_server *server = NFS_SERVER(inode); 2487 struct nfs4_exception exception = { 2488 .state = state, 2489 .inode = inode, 2490 }; 2491 int err; 2492 do { 2493 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel); 2494 trace_nfs4_setattr(inode, err); 2495 switch (err) { 2496 case -NFS4ERR_OPENMODE: 2497 if (!(sattr->ia_valid & ATTR_SIZE)) { 2498 pr_warn_once("NFSv4: server %s is incorrectly " 2499 "applying open mode checks to " 2500 "a SETATTR that is not " 2501 "changing file size.\n", 2502 server->nfs_client->cl_hostname); 2503 } 2504 if (state && !(state->state & FMODE_WRITE)) { 2505 err = -EBADF; 2506 if (sattr->ia_valid & ATTR_OPEN) 2507 err = -EACCES; 2508 goto out; 2509 } 2510 } 2511 err = nfs4_handle_exception(server, err, &exception); 2512 } while (exception.retry); 2513 out: 2514 return err; 2515 } 2516 2517 struct nfs4_closedata { 2518 struct inode *inode; 2519 struct nfs4_state *state; 2520 struct nfs_closeargs arg; 2521 struct nfs_closeres res; 2522 struct nfs_fattr fattr; 2523 unsigned long timestamp; 2524 bool roc; 2525 u32 roc_barrier; 2526 }; 2527 2528 static void nfs4_free_closedata(void *data) 2529 { 2530 struct nfs4_closedata *calldata = data; 2531 struct nfs4_state_owner *sp = calldata->state->owner; 2532 struct super_block *sb = calldata->state->inode->i_sb; 2533 2534 if (calldata->roc) 2535 pnfs_roc_release(calldata->state->inode); 2536 nfs4_put_open_state(calldata->state); 2537 nfs_free_seqid(calldata->arg.seqid); 2538 nfs4_put_state_owner(sp); 2539 nfs_sb_deactive(sb); 2540 kfree(calldata); 2541 } 2542 2543 static void nfs4_close_done(struct rpc_task *task, void *data) 2544 { 2545 struct nfs4_closedata *calldata = data; 2546 struct nfs4_state *state = calldata->state; 2547 struct nfs_server *server = NFS_SERVER(calldata->inode); 2548 2549 dprintk("%s: begin!\n", __func__); 2550 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2551 return; 2552 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 2553 /* hmm. we are done with the inode, and in the process of freeing 2554 * the state_owner. we keep this around to process errors 2555 */ 2556 switch (task->tk_status) { 2557 case 0: 2558 if (calldata->roc) 2559 pnfs_roc_set_barrier(state->inode, 2560 calldata->roc_barrier); 2561 nfs_clear_open_stateid(state, &calldata->res.stateid, 0); 2562 renew_lease(server, calldata->timestamp); 2563 goto out_release; 2564 case -NFS4ERR_ADMIN_REVOKED: 2565 case -NFS4ERR_STALE_STATEID: 2566 case -NFS4ERR_OLD_STATEID: 2567 case -NFS4ERR_BAD_STATEID: 2568 case -NFS4ERR_EXPIRED: 2569 if (calldata->arg.fmode == 0) 2570 break; 2571 default: 2572 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) { 2573 rpc_restart_call_prepare(task); 2574 goto out_release; 2575 } 2576 } 2577 nfs_clear_open_stateid(state, NULL, calldata->arg.fmode); 2578 out_release: 2579 nfs_release_seqid(calldata->arg.seqid); 2580 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2581 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2582 } 2583 2584 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2585 { 2586 struct nfs4_closedata *calldata = data; 2587 struct nfs4_state *state = calldata->state; 2588 struct inode *inode = calldata->inode; 2589 int call_close = 0; 2590 2591 dprintk("%s: begin!\n", __func__); 2592 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2593 goto out_wait; 2594 2595 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2596 calldata->arg.fmode = FMODE_READ|FMODE_WRITE; 2597 spin_lock(&state->owner->so_lock); 2598 /* Calculate the change in open mode */ 2599 if (state->n_rdwr == 0) { 2600 if (state->n_rdonly == 0) { 2601 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); 2602 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2603 calldata->arg.fmode &= ~FMODE_READ; 2604 } 2605 if (state->n_wronly == 0) { 2606 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); 2607 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2608 calldata->arg.fmode &= ~FMODE_WRITE; 2609 } 2610 } 2611 if (!nfs4_valid_open_stateid(state)) 2612 call_close = 0; 2613 spin_unlock(&state->owner->so_lock); 2614 2615 if (!call_close) { 2616 /* Note: exit _without_ calling nfs4_close_done */ 2617 goto out_no_action; 2618 } 2619 2620 if (calldata->arg.fmode == 0) { 2621 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2622 if (calldata->roc && 2623 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) { 2624 nfs_release_seqid(calldata->arg.seqid); 2625 goto out_wait; 2626 } 2627 } 2628 2629 nfs_fattr_init(calldata->res.fattr); 2630 calldata->timestamp = jiffies; 2631 if (nfs4_setup_sequence(NFS_SERVER(inode), 2632 &calldata->arg.seq_args, 2633 &calldata->res.seq_res, 2634 task) != 0) 2635 nfs_release_seqid(calldata->arg.seqid); 2636 dprintk("%s: done!\n", __func__); 2637 return; 2638 out_no_action: 2639 task->tk_action = NULL; 2640 out_wait: 2641 nfs4_sequence_done(task, &calldata->res.seq_res); 2642 } 2643 2644 static const struct rpc_call_ops nfs4_close_ops = { 2645 .rpc_call_prepare = nfs4_close_prepare, 2646 .rpc_call_done = nfs4_close_done, 2647 .rpc_release = nfs4_free_closedata, 2648 }; 2649 2650 /* 2651 * It is possible for data to be read/written from a mem-mapped file 2652 * after the sys_close call (which hits the vfs layer as a flush). 2653 * This means that we can't safely call nfsv4 close on a file until 2654 * the inode is cleared. This in turn means that we are not good 2655 * NFSv4 citizens - we do not indicate to the server to update the file's 2656 * share state even when we are done with one of the three share 2657 * stateid's in the inode. 2658 * 2659 * NOTE: Caller must be holding the sp->so_owner semaphore! 2660 */ 2661 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2662 { 2663 struct nfs_server *server = NFS_SERVER(state->inode); 2664 struct nfs4_closedata *calldata; 2665 struct nfs4_state_owner *sp = state->owner; 2666 struct rpc_task *task; 2667 struct rpc_message msg = { 2668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2669 .rpc_cred = state->owner->so_cred, 2670 }; 2671 struct rpc_task_setup task_setup_data = { 2672 .rpc_client = server->client, 2673 .rpc_message = &msg, 2674 .callback_ops = &nfs4_close_ops, 2675 .workqueue = nfsiod_workqueue, 2676 .flags = RPC_TASK_ASYNC, 2677 }; 2678 int status = -ENOMEM; 2679 2680 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 2681 &task_setup_data.rpc_client, &msg); 2682 2683 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2684 if (calldata == NULL) 2685 goto out; 2686 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2687 calldata->inode = state->inode; 2688 calldata->state = state; 2689 calldata->arg.fh = NFS_FH(state->inode); 2690 calldata->arg.stateid = &state->open_stateid; 2691 /* Serialization for the sequence id */ 2692 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask); 2693 if (calldata->arg.seqid == NULL) 2694 goto out_free_calldata; 2695 calldata->arg.fmode = 0; 2696 calldata->arg.bitmask = server->cache_consistency_bitmask; 2697 calldata->res.fattr = &calldata->fattr; 2698 calldata->res.seqid = calldata->arg.seqid; 2699 calldata->res.server = server; 2700 calldata->roc = pnfs_roc(state->inode); 2701 nfs_sb_active(calldata->inode->i_sb); 2702 2703 msg.rpc_argp = &calldata->arg; 2704 msg.rpc_resp = &calldata->res; 2705 task_setup_data.callback_data = calldata; 2706 task = rpc_run_task(&task_setup_data); 2707 if (IS_ERR(task)) 2708 return PTR_ERR(task); 2709 status = 0; 2710 if (wait) 2711 status = rpc_wait_for_completion_task(task); 2712 rpc_put_task(task); 2713 return status; 2714 out_free_calldata: 2715 kfree(calldata); 2716 out: 2717 nfs4_put_open_state(state); 2718 nfs4_put_state_owner(sp); 2719 return status; 2720 } 2721 2722 static struct inode * 2723 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 2724 int open_flags, struct iattr *attr, int *opened) 2725 { 2726 struct nfs4_state *state; 2727 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL; 2728 2729 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 2730 2731 /* Protect against concurrent sillydeletes */ 2732 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 2733 2734 nfs4_label_release_security(label); 2735 2736 if (IS_ERR(state)) 2737 return ERR_CAST(state); 2738 return state->inode; 2739 } 2740 2741 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 2742 { 2743 if (ctx->state == NULL) 2744 return; 2745 if (is_sync) 2746 nfs4_close_sync(ctx->state, ctx->mode); 2747 else 2748 nfs4_close_state(ctx->state, ctx->mode); 2749 } 2750 2751 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 2752 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 2753 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL) 2754 2755 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2756 { 2757 struct nfs4_server_caps_arg args = { 2758 .fhandle = fhandle, 2759 }; 2760 struct nfs4_server_caps_res res = {}; 2761 struct rpc_message msg = { 2762 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 2763 .rpc_argp = &args, 2764 .rpc_resp = &res, 2765 }; 2766 int status; 2767 2768 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2769 if (status == 0) { 2770 /* Sanity check the server answers */ 2771 switch (server->nfs_client->cl_minorversion) { 2772 case 0: 2773 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 2774 res.attr_bitmask[2] = 0; 2775 break; 2776 case 1: 2777 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 2778 break; 2779 case 2: 2780 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 2781 } 2782 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 2783 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 2784 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 2785 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 2786 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 2787 NFS_CAP_CTIME|NFS_CAP_MTIME| 2788 NFS_CAP_SECURITY_LABEL); 2789 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 2790 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 2791 server->caps |= NFS_CAP_ACLS; 2792 if (res.has_links != 0) 2793 server->caps |= NFS_CAP_HARDLINKS; 2794 if (res.has_symlinks != 0) 2795 server->caps |= NFS_CAP_SYMLINKS; 2796 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 2797 server->caps |= NFS_CAP_FILEID; 2798 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 2799 server->caps |= NFS_CAP_MODE; 2800 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 2801 server->caps |= NFS_CAP_NLINK; 2802 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 2803 server->caps |= NFS_CAP_OWNER; 2804 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 2805 server->caps |= NFS_CAP_OWNER_GROUP; 2806 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 2807 server->caps |= NFS_CAP_ATIME; 2808 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 2809 server->caps |= NFS_CAP_CTIME; 2810 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 2811 server->caps |= NFS_CAP_MTIME; 2812 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 2813 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 2814 server->caps |= NFS_CAP_SECURITY_LABEL; 2815 #endif 2816 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 2817 sizeof(server->attr_bitmask)); 2818 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2819 2820 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 2821 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 2822 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 2823 server->cache_consistency_bitmask[2] = 0; 2824 server->acl_bitmask = res.acl_bitmask; 2825 server->fh_expire_type = res.fh_expire_type; 2826 } 2827 2828 return status; 2829 } 2830 2831 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2832 { 2833 struct nfs4_exception exception = { }; 2834 int err; 2835 do { 2836 err = nfs4_handle_exception(server, 2837 _nfs4_server_capabilities(server, fhandle), 2838 &exception); 2839 } while (exception.retry); 2840 return err; 2841 } 2842 2843 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2844 struct nfs_fsinfo *info) 2845 { 2846 u32 bitmask[3]; 2847 struct nfs4_lookup_root_arg args = { 2848 .bitmask = bitmask, 2849 }; 2850 struct nfs4_lookup_res res = { 2851 .server = server, 2852 .fattr = info->fattr, 2853 .fh = fhandle, 2854 }; 2855 struct rpc_message msg = { 2856 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 2857 .rpc_argp = &args, 2858 .rpc_resp = &res, 2859 }; 2860 2861 bitmask[0] = nfs4_fattr_bitmap[0]; 2862 bitmask[1] = nfs4_fattr_bitmap[1]; 2863 /* 2864 * Process the label in the upcoming getfattr 2865 */ 2866 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 2867 2868 nfs_fattr_init(info->fattr); 2869 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2870 } 2871 2872 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2873 struct nfs_fsinfo *info) 2874 { 2875 struct nfs4_exception exception = { }; 2876 int err; 2877 do { 2878 err = _nfs4_lookup_root(server, fhandle, info); 2879 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 2880 switch (err) { 2881 case 0: 2882 case -NFS4ERR_WRONGSEC: 2883 goto out; 2884 default: 2885 err = nfs4_handle_exception(server, err, &exception); 2886 } 2887 } while (exception.retry); 2888 out: 2889 return err; 2890 } 2891 2892 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2893 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 2894 { 2895 struct rpc_auth_create_args auth_args = { 2896 .pseudoflavor = flavor, 2897 }; 2898 struct rpc_auth *auth; 2899 int ret; 2900 2901 auth = rpcauth_create(&auth_args, server->client); 2902 if (IS_ERR(auth)) { 2903 ret = -EACCES; 2904 goto out; 2905 } 2906 ret = nfs4_lookup_root(server, fhandle, info); 2907 out: 2908 return ret; 2909 } 2910 2911 /* 2912 * Retry pseudoroot lookup with various security flavors. We do this when: 2913 * 2914 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 2915 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 2916 * 2917 * Returns zero on success, or a negative NFS4ERR value, or a 2918 * negative errno value. 2919 */ 2920 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2921 struct nfs_fsinfo *info) 2922 { 2923 /* Per 3530bis 15.33.5 */ 2924 static const rpc_authflavor_t flav_array[] = { 2925 RPC_AUTH_GSS_KRB5P, 2926 RPC_AUTH_GSS_KRB5I, 2927 RPC_AUTH_GSS_KRB5, 2928 RPC_AUTH_UNIX, /* courtesy */ 2929 RPC_AUTH_NULL, 2930 }; 2931 int status = -EPERM; 2932 size_t i; 2933 2934 if (server->auth_info.flavor_len > 0) { 2935 /* try each flavor specified by user */ 2936 for (i = 0; i < server->auth_info.flavor_len; i++) { 2937 status = nfs4_lookup_root_sec(server, fhandle, info, 2938 server->auth_info.flavors[i]); 2939 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 2940 continue; 2941 break; 2942 } 2943 } else { 2944 /* no flavors specified by user, try default list */ 2945 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 2946 status = nfs4_lookup_root_sec(server, fhandle, info, 2947 flav_array[i]); 2948 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 2949 continue; 2950 break; 2951 } 2952 } 2953 2954 /* 2955 * -EACCESS could mean that the user doesn't have correct permissions 2956 * to access the mount. It could also mean that we tried to mount 2957 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 2958 * existing mount programs don't handle -EACCES very well so it should 2959 * be mapped to -EPERM instead. 2960 */ 2961 if (status == -EACCES) 2962 status = -EPERM; 2963 return status; 2964 } 2965 2966 static int nfs4_do_find_root_sec(struct nfs_server *server, 2967 struct nfs_fh *fhandle, struct nfs_fsinfo *info) 2968 { 2969 int mv = server->nfs_client->cl_minorversion; 2970 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info); 2971 } 2972 2973 /** 2974 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 2975 * @server: initialized nfs_server handle 2976 * @fhandle: we fill in the pseudo-fs root file handle 2977 * @info: we fill in an FSINFO struct 2978 * @auth_probe: probe the auth flavours 2979 * 2980 * Returns zero on success, or a negative errno. 2981 */ 2982 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 2983 struct nfs_fsinfo *info, 2984 bool auth_probe) 2985 { 2986 int status; 2987 2988 switch (auth_probe) { 2989 case false: 2990 status = nfs4_lookup_root(server, fhandle, info); 2991 if (status != -NFS4ERR_WRONGSEC) 2992 break; 2993 default: 2994 status = nfs4_do_find_root_sec(server, fhandle, info); 2995 } 2996 2997 if (status == 0) 2998 status = nfs4_server_capabilities(server, fhandle); 2999 if (status == 0) 3000 status = nfs4_do_fsinfo(server, fhandle, info); 3001 3002 return nfs4_map_errors(status); 3003 } 3004 3005 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 3006 struct nfs_fsinfo *info) 3007 { 3008 int error; 3009 struct nfs_fattr *fattr = info->fattr; 3010 struct nfs4_label *label = NULL; 3011 3012 error = nfs4_server_capabilities(server, mntfh); 3013 if (error < 0) { 3014 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 3015 return error; 3016 } 3017 3018 label = nfs4_label_alloc(server, GFP_KERNEL); 3019 if (IS_ERR(label)) 3020 return PTR_ERR(label); 3021 3022 error = nfs4_proc_getattr(server, mntfh, fattr, label); 3023 if (error < 0) { 3024 dprintk("nfs4_get_root: getattr error = %d\n", -error); 3025 goto err_free_label; 3026 } 3027 3028 if (fattr->valid & NFS_ATTR_FATTR_FSID && 3029 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 3030 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 3031 3032 err_free_label: 3033 nfs4_label_free(label); 3034 3035 return error; 3036 } 3037 3038 /* 3039 * Get locations and (maybe) other attributes of a referral. 3040 * Note that we'll actually follow the referral later when 3041 * we detect fsid mismatch in inode revalidation 3042 */ 3043 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 3044 const struct qstr *name, struct nfs_fattr *fattr, 3045 struct nfs_fh *fhandle) 3046 { 3047 int status = -ENOMEM; 3048 struct page *page = NULL; 3049 struct nfs4_fs_locations *locations = NULL; 3050 3051 page = alloc_page(GFP_KERNEL); 3052 if (page == NULL) 3053 goto out; 3054 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 3055 if (locations == NULL) 3056 goto out; 3057 3058 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 3059 if (status != 0) 3060 goto out; 3061 3062 /* 3063 * If the fsid didn't change, this is a migration event, not a 3064 * referral. Cause us to drop into the exception handler, which 3065 * will kick off migration recovery. 3066 */ 3067 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 3068 dprintk("%s: server did not return a different fsid for" 3069 " a referral at %s\n", __func__, name->name); 3070 status = -NFS4ERR_MOVED; 3071 goto out; 3072 } 3073 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 3074 nfs_fixup_referral_attributes(&locations->fattr); 3075 3076 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 3077 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 3078 memset(fhandle, 0, sizeof(struct nfs_fh)); 3079 out: 3080 if (page) 3081 __free_page(page); 3082 kfree(locations); 3083 return status; 3084 } 3085 3086 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3087 struct nfs_fattr *fattr, struct nfs4_label *label) 3088 { 3089 struct nfs4_getattr_arg args = { 3090 .fh = fhandle, 3091 .bitmask = server->attr_bitmask, 3092 }; 3093 struct nfs4_getattr_res res = { 3094 .fattr = fattr, 3095 .label = label, 3096 .server = server, 3097 }; 3098 struct rpc_message msg = { 3099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 3100 .rpc_argp = &args, 3101 .rpc_resp = &res, 3102 }; 3103 3104 args.bitmask = nfs4_bitmask(server, label); 3105 3106 nfs_fattr_init(fattr); 3107 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3108 } 3109 3110 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 3111 struct nfs_fattr *fattr, struct nfs4_label *label) 3112 { 3113 struct nfs4_exception exception = { }; 3114 int err; 3115 do { 3116 err = _nfs4_proc_getattr(server, fhandle, fattr, label); 3117 trace_nfs4_getattr(server, fhandle, fattr, err); 3118 err = nfs4_handle_exception(server, err, 3119 &exception); 3120 } while (exception.retry); 3121 return err; 3122 } 3123 3124 /* 3125 * The file is not closed if it is opened due to the a request to change 3126 * the size of the file. The open call will not be needed once the 3127 * VFS layer lookup-intents are implemented. 3128 * 3129 * Close is called when the inode is destroyed. 3130 * If we haven't opened the file for O_WRONLY, we 3131 * need to in the size_change case to obtain a stateid. 3132 * 3133 * Got race? 3134 * Because OPEN is always done by name in nfsv4, it is 3135 * possible that we opened a different file by the same 3136 * name. We can recognize this race condition, but we 3137 * can't do anything about it besides returning an error. 3138 * 3139 * This will be fixed with VFS changes (lookup-intent). 3140 */ 3141 static int 3142 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 3143 struct iattr *sattr) 3144 { 3145 struct inode *inode = dentry->d_inode; 3146 struct rpc_cred *cred = NULL; 3147 struct nfs4_state *state = NULL; 3148 struct nfs4_label *label = NULL; 3149 int status; 3150 3151 if (pnfs_ld_layoutret_on_setattr(inode)) 3152 pnfs_commit_and_return_layout(inode); 3153 3154 nfs_fattr_init(fattr); 3155 3156 /* Deal with open(O_TRUNC) */ 3157 if (sattr->ia_valid & ATTR_OPEN) 3158 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 3159 3160 /* Optimization: if the end result is no change, don't RPC */ 3161 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 3162 return 0; 3163 3164 /* Search for an existing open(O_WRITE) file */ 3165 if (sattr->ia_valid & ATTR_FILE) { 3166 struct nfs_open_context *ctx; 3167 3168 ctx = nfs_file_open_context(sattr->ia_file); 3169 if (ctx) { 3170 cred = ctx->cred; 3171 state = ctx->state; 3172 } 3173 } 3174 3175 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 3176 if (IS_ERR(label)) 3177 return PTR_ERR(label); 3178 3179 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label); 3180 if (status == 0) { 3181 nfs_setattr_update_inode(inode, sattr); 3182 nfs_setsecurity(inode, fattr, label); 3183 } 3184 nfs4_label_free(label); 3185 return status; 3186 } 3187 3188 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 3189 const struct qstr *name, struct nfs_fh *fhandle, 3190 struct nfs_fattr *fattr, struct nfs4_label *label) 3191 { 3192 struct nfs_server *server = NFS_SERVER(dir); 3193 int status; 3194 struct nfs4_lookup_arg args = { 3195 .bitmask = server->attr_bitmask, 3196 .dir_fh = NFS_FH(dir), 3197 .name = name, 3198 }; 3199 struct nfs4_lookup_res res = { 3200 .server = server, 3201 .fattr = fattr, 3202 .label = label, 3203 .fh = fhandle, 3204 }; 3205 struct rpc_message msg = { 3206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 3207 .rpc_argp = &args, 3208 .rpc_resp = &res, 3209 }; 3210 3211 args.bitmask = nfs4_bitmask(server, label); 3212 3213 nfs_fattr_init(fattr); 3214 3215 dprintk("NFS call lookup %s\n", name->name); 3216 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 3217 dprintk("NFS reply lookup: %d\n", status); 3218 return status; 3219 } 3220 3221 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 3222 { 3223 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 3224 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 3225 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 3226 fattr->nlink = 2; 3227 } 3228 3229 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 3230 struct qstr *name, struct nfs_fh *fhandle, 3231 struct nfs_fattr *fattr, struct nfs4_label *label) 3232 { 3233 struct nfs4_exception exception = { }; 3234 struct rpc_clnt *client = *clnt; 3235 int err; 3236 do { 3237 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label); 3238 trace_nfs4_lookup(dir, name, err); 3239 switch (err) { 3240 case -NFS4ERR_BADNAME: 3241 err = -ENOENT; 3242 goto out; 3243 case -NFS4ERR_MOVED: 3244 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 3245 goto out; 3246 case -NFS4ERR_WRONGSEC: 3247 err = -EPERM; 3248 if (client != *clnt) 3249 goto out; 3250 client = nfs4_create_sec_client(client, dir, name); 3251 if (IS_ERR(client)) 3252 return PTR_ERR(client); 3253 3254 exception.retry = 1; 3255 break; 3256 default: 3257 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 3258 } 3259 } while (exception.retry); 3260 3261 out: 3262 if (err == 0) 3263 *clnt = client; 3264 else if (client != *clnt) 3265 rpc_shutdown_client(client); 3266 3267 return err; 3268 } 3269 3270 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, 3271 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 3272 struct nfs4_label *label) 3273 { 3274 int status; 3275 struct rpc_clnt *client = NFS_CLIENT(dir); 3276 3277 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label); 3278 if (client != NFS_CLIENT(dir)) { 3279 rpc_shutdown_client(client); 3280 nfs_fixup_secinfo_attributes(fattr); 3281 } 3282 return status; 3283 } 3284 3285 struct rpc_clnt * 3286 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name, 3287 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 3288 { 3289 struct rpc_clnt *client = NFS_CLIENT(dir); 3290 int status; 3291 3292 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL); 3293 if (status < 0) 3294 return ERR_PTR(status); 3295 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 3296 } 3297 3298 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3299 { 3300 struct nfs_server *server = NFS_SERVER(inode); 3301 struct nfs4_accessargs args = { 3302 .fh = NFS_FH(inode), 3303 .bitmask = server->cache_consistency_bitmask, 3304 }; 3305 struct nfs4_accessres res = { 3306 .server = server, 3307 }; 3308 struct rpc_message msg = { 3309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 3310 .rpc_argp = &args, 3311 .rpc_resp = &res, 3312 .rpc_cred = entry->cred, 3313 }; 3314 int mode = entry->mask; 3315 int status = 0; 3316 3317 /* 3318 * Determine which access bits we want to ask for... 3319 */ 3320 if (mode & MAY_READ) 3321 args.access |= NFS4_ACCESS_READ; 3322 if (S_ISDIR(inode->i_mode)) { 3323 if (mode & MAY_WRITE) 3324 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 3325 if (mode & MAY_EXEC) 3326 args.access |= NFS4_ACCESS_LOOKUP; 3327 } else { 3328 if (mode & MAY_WRITE) 3329 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 3330 if (mode & MAY_EXEC) 3331 args.access |= NFS4_ACCESS_EXECUTE; 3332 } 3333 3334 res.fattr = nfs_alloc_fattr(); 3335 if (res.fattr == NULL) 3336 return -ENOMEM; 3337 3338 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3339 if (!status) { 3340 nfs_access_set_mask(entry, res.access); 3341 nfs_refresh_inode(inode, res.fattr); 3342 } 3343 nfs_free_fattr(res.fattr); 3344 return status; 3345 } 3346 3347 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 3348 { 3349 struct nfs4_exception exception = { }; 3350 int err; 3351 do { 3352 err = _nfs4_proc_access(inode, entry); 3353 trace_nfs4_access(inode, err); 3354 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3355 &exception); 3356 } while (exception.retry); 3357 return err; 3358 } 3359 3360 /* 3361 * TODO: For the time being, we don't try to get any attributes 3362 * along with any of the zero-copy operations READ, READDIR, 3363 * READLINK, WRITE. 3364 * 3365 * In the case of the first three, we want to put the GETATTR 3366 * after the read-type operation -- this is because it is hard 3367 * to predict the length of a GETATTR response in v4, and thus 3368 * align the READ data correctly. This means that the GETATTR 3369 * may end up partially falling into the page cache, and we should 3370 * shift it into the 'tail' of the xdr_buf before processing. 3371 * To do this efficiently, we need to know the total length 3372 * of data received, which doesn't seem to be available outside 3373 * of the RPC layer. 3374 * 3375 * In the case of WRITE, we also want to put the GETATTR after 3376 * the operation -- in this case because we want to make sure 3377 * we get the post-operation mtime and size. 3378 * 3379 * Both of these changes to the XDR layer would in fact be quite 3380 * minor, but I decided to leave them for a subsequent patch. 3381 */ 3382 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 3383 unsigned int pgbase, unsigned int pglen) 3384 { 3385 struct nfs4_readlink args = { 3386 .fh = NFS_FH(inode), 3387 .pgbase = pgbase, 3388 .pglen = pglen, 3389 .pages = &page, 3390 }; 3391 struct nfs4_readlink_res res; 3392 struct rpc_message msg = { 3393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 3394 .rpc_argp = &args, 3395 .rpc_resp = &res, 3396 }; 3397 3398 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 3399 } 3400 3401 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 3402 unsigned int pgbase, unsigned int pglen) 3403 { 3404 struct nfs4_exception exception = { }; 3405 int err; 3406 do { 3407 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 3408 trace_nfs4_readlink(inode, err); 3409 err = nfs4_handle_exception(NFS_SERVER(inode), err, 3410 &exception); 3411 } while (exception.retry); 3412 return err; 3413 } 3414 3415 /* 3416 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 3417 */ 3418 static int 3419 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 3420 int flags) 3421 { 3422 struct nfs4_label l, *ilabel = NULL; 3423 struct nfs_open_context *ctx; 3424 struct nfs4_state *state; 3425 int opened = 0; 3426 int status = 0; 3427 3428 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 3429 if (IS_ERR(ctx)) 3430 return PTR_ERR(ctx); 3431 3432 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 3433 3434 sattr->ia_mode &= ~current_umask(); 3435 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened); 3436 if (IS_ERR(state)) { 3437 status = PTR_ERR(state); 3438 goto out; 3439 } 3440 out: 3441 nfs4_label_release_security(ilabel); 3442 put_nfs_open_context(ctx); 3443 return status; 3444 } 3445 3446 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 3447 { 3448 struct nfs_server *server = NFS_SERVER(dir); 3449 struct nfs_removeargs args = { 3450 .fh = NFS_FH(dir), 3451 .name = *name, 3452 }; 3453 struct nfs_removeres res = { 3454 .server = server, 3455 }; 3456 struct rpc_message msg = { 3457 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 3458 .rpc_argp = &args, 3459 .rpc_resp = &res, 3460 }; 3461 int status; 3462 3463 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 3464 if (status == 0) 3465 update_changeattr(dir, &res.cinfo); 3466 return status; 3467 } 3468 3469 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 3470 { 3471 struct nfs4_exception exception = { }; 3472 int err; 3473 do { 3474 err = _nfs4_proc_remove(dir, name); 3475 trace_nfs4_remove(dir, name, err); 3476 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3477 &exception); 3478 } while (exception.retry); 3479 return err; 3480 } 3481 3482 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 3483 { 3484 struct nfs_server *server = NFS_SERVER(dir); 3485 struct nfs_removeargs *args = msg->rpc_argp; 3486 struct nfs_removeres *res = msg->rpc_resp; 3487 3488 res->server = server; 3489 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 3490 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1); 3491 3492 nfs_fattr_init(res->dir_attr); 3493 } 3494 3495 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 3496 { 3497 nfs4_setup_sequence(NFS_SERVER(data->dir), 3498 &data->args.seq_args, 3499 &data->res.seq_res, 3500 task); 3501 } 3502 3503 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 3504 { 3505 struct nfs_unlinkdata *data = task->tk_calldata; 3506 struct nfs_removeres *res = &data->res; 3507 3508 if (!nfs4_sequence_done(task, &res->seq_res)) 3509 return 0; 3510 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 3511 return 0; 3512 update_changeattr(dir, &res->cinfo); 3513 return 1; 3514 } 3515 3516 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 3517 { 3518 struct nfs_server *server = NFS_SERVER(dir); 3519 struct nfs_renameargs *arg = msg->rpc_argp; 3520 struct nfs_renameres *res = msg->rpc_resp; 3521 3522 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 3523 res->server = server; 3524 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1); 3525 } 3526 3527 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 3528 { 3529 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 3530 &data->args.seq_args, 3531 &data->res.seq_res, 3532 task); 3533 } 3534 3535 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 3536 struct inode *new_dir) 3537 { 3538 struct nfs_renamedata *data = task->tk_calldata; 3539 struct nfs_renameres *res = &data->res; 3540 3541 if (!nfs4_sequence_done(task, &res->seq_res)) 3542 return 0; 3543 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 3544 return 0; 3545 3546 update_changeattr(old_dir, &res->old_cinfo); 3547 update_changeattr(new_dir, &res->new_cinfo); 3548 return 1; 3549 } 3550 3551 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3552 { 3553 struct nfs_server *server = NFS_SERVER(inode); 3554 struct nfs4_link_arg arg = { 3555 .fh = NFS_FH(inode), 3556 .dir_fh = NFS_FH(dir), 3557 .name = name, 3558 .bitmask = server->attr_bitmask, 3559 }; 3560 struct nfs4_link_res res = { 3561 .server = server, 3562 .label = NULL, 3563 }; 3564 struct rpc_message msg = { 3565 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3566 .rpc_argp = &arg, 3567 .rpc_resp = &res, 3568 }; 3569 int status = -ENOMEM; 3570 3571 res.fattr = nfs_alloc_fattr(); 3572 if (res.fattr == NULL) 3573 goto out; 3574 3575 res.label = nfs4_label_alloc(server, GFP_KERNEL); 3576 if (IS_ERR(res.label)) { 3577 status = PTR_ERR(res.label); 3578 goto out; 3579 } 3580 arg.bitmask = nfs4_bitmask(server, res.label); 3581 3582 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3583 if (!status) { 3584 update_changeattr(dir, &res.cinfo); 3585 status = nfs_post_op_update_inode(inode, res.fattr); 3586 if (!status) 3587 nfs_setsecurity(inode, res.fattr, res.label); 3588 } 3589 3590 3591 nfs4_label_free(res.label); 3592 3593 out: 3594 nfs_free_fattr(res.fattr); 3595 return status; 3596 } 3597 3598 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3599 { 3600 struct nfs4_exception exception = { }; 3601 int err; 3602 do { 3603 err = nfs4_handle_exception(NFS_SERVER(inode), 3604 _nfs4_proc_link(inode, dir, name), 3605 &exception); 3606 } while (exception.retry); 3607 return err; 3608 } 3609 3610 struct nfs4_createdata { 3611 struct rpc_message msg; 3612 struct nfs4_create_arg arg; 3613 struct nfs4_create_res res; 3614 struct nfs_fh fh; 3615 struct nfs_fattr fattr; 3616 struct nfs4_label *label; 3617 }; 3618 3619 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3620 struct qstr *name, struct iattr *sattr, u32 ftype) 3621 { 3622 struct nfs4_createdata *data; 3623 3624 data = kzalloc(sizeof(*data), GFP_KERNEL); 3625 if (data != NULL) { 3626 struct nfs_server *server = NFS_SERVER(dir); 3627 3628 data->label = nfs4_label_alloc(server, GFP_KERNEL); 3629 if (IS_ERR(data->label)) 3630 goto out_free; 3631 3632 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3633 data->msg.rpc_argp = &data->arg; 3634 data->msg.rpc_resp = &data->res; 3635 data->arg.dir_fh = NFS_FH(dir); 3636 data->arg.server = server; 3637 data->arg.name = name; 3638 data->arg.attrs = sattr; 3639 data->arg.ftype = ftype; 3640 data->arg.bitmask = nfs4_bitmask(server, data->label); 3641 data->res.server = server; 3642 data->res.fh = &data->fh; 3643 data->res.fattr = &data->fattr; 3644 data->res.label = data->label; 3645 nfs_fattr_init(data->res.fattr); 3646 } 3647 return data; 3648 out_free: 3649 kfree(data); 3650 return NULL; 3651 } 3652 3653 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3654 { 3655 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3656 &data->arg.seq_args, &data->res.seq_res, 1); 3657 if (status == 0) { 3658 update_changeattr(dir, &data->res.dir_cinfo); 3659 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); 3660 } 3661 return status; 3662 } 3663 3664 static void nfs4_free_createdata(struct nfs4_createdata *data) 3665 { 3666 nfs4_label_free(data->label); 3667 kfree(data); 3668 } 3669 3670 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3671 struct page *page, unsigned int len, struct iattr *sattr, 3672 struct nfs4_label *label) 3673 { 3674 struct nfs4_createdata *data; 3675 int status = -ENAMETOOLONG; 3676 3677 if (len > NFS4_MAXPATHLEN) 3678 goto out; 3679 3680 status = -ENOMEM; 3681 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3682 if (data == NULL) 3683 goto out; 3684 3685 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3686 data->arg.u.symlink.pages = &page; 3687 data->arg.u.symlink.len = len; 3688 data->arg.label = label; 3689 3690 status = nfs4_do_create(dir, dentry, data); 3691 3692 nfs4_free_createdata(data); 3693 out: 3694 return status; 3695 } 3696 3697 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3698 struct page *page, unsigned int len, struct iattr *sattr) 3699 { 3700 struct nfs4_exception exception = { }; 3701 struct nfs4_label l, *label = NULL; 3702 int err; 3703 3704 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3705 3706 do { 3707 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 3708 trace_nfs4_symlink(dir, &dentry->d_name, err); 3709 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3710 &exception); 3711 } while (exception.retry); 3712 3713 nfs4_label_release_security(label); 3714 return err; 3715 } 3716 3717 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3718 struct iattr *sattr, struct nfs4_label *label) 3719 { 3720 struct nfs4_createdata *data; 3721 int status = -ENOMEM; 3722 3723 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 3724 if (data == NULL) 3725 goto out; 3726 3727 data->arg.label = label; 3728 status = nfs4_do_create(dir, dentry, data); 3729 3730 nfs4_free_createdata(data); 3731 out: 3732 return status; 3733 } 3734 3735 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3736 struct iattr *sattr) 3737 { 3738 struct nfs4_exception exception = { }; 3739 struct nfs4_label l, *label = NULL; 3740 int err; 3741 3742 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3743 3744 sattr->ia_mode &= ~current_umask(); 3745 do { 3746 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 3747 trace_nfs4_mkdir(dir, &dentry->d_name, err); 3748 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3749 &exception); 3750 } while (exception.retry); 3751 nfs4_label_release_security(label); 3752 3753 return err; 3754 } 3755 3756 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3757 u64 cookie, struct page **pages, unsigned int count, int plus) 3758 { 3759 struct inode *dir = dentry->d_inode; 3760 struct nfs4_readdir_arg args = { 3761 .fh = NFS_FH(dir), 3762 .pages = pages, 3763 .pgbase = 0, 3764 .count = count, 3765 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 3766 .plus = plus, 3767 }; 3768 struct nfs4_readdir_res res; 3769 struct rpc_message msg = { 3770 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 3771 .rpc_argp = &args, 3772 .rpc_resp = &res, 3773 .rpc_cred = cred, 3774 }; 3775 int status; 3776 3777 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__, 3778 dentry, 3779 (unsigned long long)cookie); 3780 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 3781 res.pgbase = args.pgbase; 3782 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 3783 if (status >= 0) { 3784 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 3785 status += args.pgbase; 3786 } 3787 3788 nfs_invalidate_atime(dir); 3789 3790 dprintk("%s: returns %d\n", __func__, status); 3791 return status; 3792 } 3793 3794 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3795 u64 cookie, struct page **pages, unsigned int count, int plus) 3796 { 3797 struct nfs4_exception exception = { }; 3798 int err; 3799 do { 3800 err = _nfs4_proc_readdir(dentry, cred, cookie, 3801 pages, count, plus); 3802 trace_nfs4_readdir(dentry->d_inode, err); 3803 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err, 3804 &exception); 3805 } while (exception.retry); 3806 return err; 3807 } 3808 3809 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3810 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 3811 { 3812 struct nfs4_createdata *data; 3813 int mode = sattr->ia_mode; 3814 int status = -ENOMEM; 3815 3816 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 3817 if (data == NULL) 3818 goto out; 3819 3820 if (S_ISFIFO(mode)) 3821 data->arg.ftype = NF4FIFO; 3822 else if (S_ISBLK(mode)) { 3823 data->arg.ftype = NF4BLK; 3824 data->arg.u.device.specdata1 = MAJOR(rdev); 3825 data->arg.u.device.specdata2 = MINOR(rdev); 3826 } 3827 else if (S_ISCHR(mode)) { 3828 data->arg.ftype = NF4CHR; 3829 data->arg.u.device.specdata1 = MAJOR(rdev); 3830 data->arg.u.device.specdata2 = MINOR(rdev); 3831 } else if (!S_ISSOCK(mode)) { 3832 status = -EINVAL; 3833 goto out_free; 3834 } 3835 3836 data->arg.label = label; 3837 status = nfs4_do_create(dir, dentry, data); 3838 out_free: 3839 nfs4_free_createdata(data); 3840 out: 3841 return status; 3842 } 3843 3844 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3845 struct iattr *sattr, dev_t rdev) 3846 { 3847 struct nfs4_exception exception = { }; 3848 struct nfs4_label l, *label = NULL; 3849 int err; 3850 3851 label = nfs4_label_init_security(dir, dentry, sattr, &l); 3852 3853 sattr->ia_mode &= ~current_umask(); 3854 do { 3855 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 3856 trace_nfs4_mknod(dir, &dentry->d_name, err); 3857 err = nfs4_handle_exception(NFS_SERVER(dir), err, 3858 &exception); 3859 } while (exception.retry); 3860 3861 nfs4_label_release_security(label); 3862 3863 return err; 3864 } 3865 3866 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 3867 struct nfs_fsstat *fsstat) 3868 { 3869 struct nfs4_statfs_arg args = { 3870 .fh = fhandle, 3871 .bitmask = server->attr_bitmask, 3872 }; 3873 struct nfs4_statfs_res res = { 3874 .fsstat = fsstat, 3875 }; 3876 struct rpc_message msg = { 3877 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 3878 .rpc_argp = &args, 3879 .rpc_resp = &res, 3880 }; 3881 3882 nfs_fattr_init(fsstat->fattr); 3883 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3884 } 3885 3886 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 3887 { 3888 struct nfs4_exception exception = { }; 3889 int err; 3890 do { 3891 err = nfs4_handle_exception(server, 3892 _nfs4_proc_statfs(server, fhandle, fsstat), 3893 &exception); 3894 } while (exception.retry); 3895 return err; 3896 } 3897 3898 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 3899 struct nfs_fsinfo *fsinfo) 3900 { 3901 struct nfs4_fsinfo_arg args = { 3902 .fh = fhandle, 3903 .bitmask = server->attr_bitmask, 3904 }; 3905 struct nfs4_fsinfo_res res = { 3906 .fsinfo = fsinfo, 3907 }; 3908 struct rpc_message msg = { 3909 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 3910 .rpc_argp = &args, 3911 .rpc_resp = &res, 3912 }; 3913 3914 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3915 } 3916 3917 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3918 { 3919 struct nfs4_exception exception = { }; 3920 unsigned long now = jiffies; 3921 int err; 3922 3923 do { 3924 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 3925 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 3926 if (err == 0) { 3927 struct nfs_client *clp = server->nfs_client; 3928 3929 spin_lock(&clp->cl_lock); 3930 clp->cl_lease_time = fsinfo->lease_time * HZ; 3931 clp->cl_last_renewal = now; 3932 spin_unlock(&clp->cl_lock); 3933 break; 3934 } 3935 err = nfs4_handle_exception(server, err, &exception); 3936 } while (exception.retry); 3937 return err; 3938 } 3939 3940 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3941 { 3942 int error; 3943 3944 nfs_fattr_init(fsinfo->fattr); 3945 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 3946 if (error == 0) { 3947 /* block layout checks this! */ 3948 server->pnfs_blksize = fsinfo->blksize; 3949 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 3950 } 3951 3952 return error; 3953 } 3954 3955 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 3956 struct nfs_pathconf *pathconf) 3957 { 3958 struct nfs4_pathconf_arg args = { 3959 .fh = fhandle, 3960 .bitmask = server->attr_bitmask, 3961 }; 3962 struct nfs4_pathconf_res res = { 3963 .pathconf = pathconf, 3964 }; 3965 struct rpc_message msg = { 3966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 3967 .rpc_argp = &args, 3968 .rpc_resp = &res, 3969 }; 3970 3971 /* None of the pathconf attributes are mandatory to implement */ 3972 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 3973 memset(pathconf, 0, sizeof(*pathconf)); 3974 return 0; 3975 } 3976 3977 nfs_fattr_init(pathconf->fattr); 3978 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3979 } 3980 3981 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 3982 struct nfs_pathconf *pathconf) 3983 { 3984 struct nfs4_exception exception = { }; 3985 int err; 3986 3987 do { 3988 err = nfs4_handle_exception(server, 3989 _nfs4_proc_pathconf(server, fhandle, pathconf), 3990 &exception); 3991 } while (exception.retry); 3992 return err; 3993 } 3994 3995 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 3996 const struct nfs_open_context *ctx, 3997 const struct nfs_lock_context *l_ctx, 3998 fmode_t fmode) 3999 { 4000 const struct nfs_lockowner *lockowner = NULL; 4001 4002 if (l_ctx != NULL) 4003 lockowner = &l_ctx->lockowner; 4004 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner); 4005 } 4006 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 4007 4008 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 4009 const struct nfs_open_context *ctx, 4010 const struct nfs_lock_context *l_ctx, 4011 fmode_t fmode) 4012 { 4013 nfs4_stateid current_stateid; 4014 4015 /* If the current stateid represents a lost lock, then exit */ 4016 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO) 4017 return true; 4018 return nfs4_stateid_match(stateid, ¤t_stateid); 4019 } 4020 4021 static bool nfs4_error_stateid_expired(int err) 4022 { 4023 switch (err) { 4024 case -NFS4ERR_DELEG_REVOKED: 4025 case -NFS4ERR_ADMIN_REVOKED: 4026 case -NFS4ERR_BAD_STATEID: 4027 case -NFS4ERR_STALE_STATEID: 4028 case -NFS4ERR_OLD_STATEID: 4029 case -NFS4ERR_OPENMODE: 4030 case -NFS4ERR_EXPIRED: 4031 return true; 4032 } 4033 return false; 4034 } 4035 4036 void __nfs4_read_done_cb(struct nfs_read_data *data) 4037 { 4038 nfs_invalidate_atime(data->header->inode); 4039 } 4040 4041 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data) 4042 { 4043 struct nfs_server *server = NFS_SERVER(data->header->inode); 4044 4045 trace_nfs4_read(data, task->tk_status); 4046 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) { 4047 rpc_restart_call_prepare(task); 4048 return -EAGAIN; 4049 } 4050 4051 __nfs4_read_done_cb(data); 4052 if (task->tk_status > 0) 4053 renew_lease(server, data->timestamp); 4054 return 0; 4055 } 4056 4057 static bool nfs4_read_stateid_changed(struct rpc_task *task, 4058 struct nfs_readargs *args) 4059 { 4060 4061 if (!nfs4_error_stateid_expired(task->tk_status) || 4062 nfs4_stateid_is_current(&args->stateid, 4063 args->context, 4064 args->lock_context, 4065 FMODE_READ)) 4066 return false; 4067 rpc_restart_call_prepare(task); 4068 return true; 4069 } 4070 4071 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) 4072 { 4073 4074 dprintk("--> %s\n", __func__); 4075 4076 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4077 return -EAGAIN; 4078 if (nfs4_read_stateid_changed(task, &data->args)) 4079 return -EAGAIN; 4080 return data->read_done_cb ? data->read_done_cb(task, data) : 4081 nfs4_read_done_cb(task, data); 4082 } 4083 4084 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) 4085 { 4086 data->timestamp = jiffies; 4087 data->read_done_cb = nfs4_read_done_cb; 4088 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 4089 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 4090 } 4091 4092 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data) 4093 { 4094 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode), 4095 &data->args.seq_args, 4096 &data->res.seq_res, 4097 task)) 4098 return 0; 4099 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context, 4100 data->args.lock_context, FMODE_READ) == -EIO) 4101 return -EIO; 4102 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags))) 4103 return -EIO; 4104 return 0; 4105 } 4106 4107 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data) 4108 { 4109 struct inode *inode = data->header->inode; 4110 4111 trace_nfs4_write(data, task->tk_status); 4112 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) { 4113 rpc_restart_call_prepare(task); 4114 return -EAGAIN; 4115 } 4116 if (task->tk_status >= 0) { 4117 renew_lease(NFS_SERVER(inode), data->timestamp); 4118 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 4119 } 4120 return 0; 4121 } 4122 4123 static bool nfs4_write_stateid_changed(struct rpc_task *task, 4124 struct nfs_writeargs *args) 4125 { 4126 4127 if (!nfs4_error_stateid_expired(task->tk_status) || 4128 nfs4_stateid_is_current(&args->stateid, 4129 args->context, 4130 args->lock_context, 4131 FMODE_WRITE)) 4132 return false; 4133 rpc_restart_call_prepare(task); 4134 return true; 4135 } 4136 4137 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) 4138 { 4139 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4140 return -EAGAIN; 4141 if (nfs4_write_stateid_changed(task, &data->args)) 4142 return -EAGAIN; 4143 return data->write_done_cb ? data->write_done_cb(task, data) : 4144 nfs4_write_done_cb(task, data); 4145 } 4146 4147 static 4148 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data) 4149 { 4150 const struct nfs_pgio_header *hdr = data->header; 4151 4152 /* Don't request attributes for pNFS or O_DIRECT writes */ 4153 if (data->ds_clp != NULL || hdr->dreq != NULL) 4154 return false; 4155 /* Otherwise, request attributes if and only if we don't hold 4156 * a delegation 4157 */ 4158 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 4159 } 4160 4161 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) 4162 { 4163 struct nfs_server *server = NFS_SERVER(data->header->inode); 4164 4165 if (!nfs4_write_need_cache_consistency_data(data)) { 4166 data->args.bitmask = NULL; 4167 data->res.fattr = NULL; 4168 } else 4169 data->args.bitmask = server->cache_consistency_bitmask; 4170 4171 if (!data->write_done_cb) 4172 data->write_done_cb = nfs4_write_done_cb; 4173 data->res.server = server; 4174 data->timestamp = jiffies; 4175 4176 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 4177 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4178 } 4179 4180 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data) 4181 { 4182 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode), 4183 &data->args.seq_args, 4184 &data->res.seq_res, 4185 task)) 4186 return 0; 4187 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context, 4188 data->args.lock_context, FMODE_WRITE) == -EIO) 4189 return -EIO; 4190 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags))) 4191 return -EIO; 4192 return 0; 4193 } 4194 4195 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 4196 { 4197 nfs4_setup_sequence(NFS_SERVER(data->inode), 4198 &data->args.seq_args, 4199 &data->res.seq_res, 4200 task); 4201 } 4202 4203 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 4204 { 4205 struct inode *inode = data->inode; 4206 4207 trace_nfs4_commit(data, task->tk_status); 4208 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) { 4209 rpc_restart_call_prepare(task); 4210 return -EAGAIN; 4211 } 4212 return 0; 4213 } 4214 4215 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 4216 { 4217 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4218 return -EAGAIN; 4219 return data->commit_done_cb(task, data); 4220 } 4221 4222 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 4223 { 4224 struct nfs_server *server = NFS_SERVER(data->inode); 4225 4226 if (data->commit_done_cb == NULL) 4227 data->commit_done_cb = nfs4_commit_done_cb; 4228 data->res.server = server; 4229 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 4230 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4231 } 4232 4233 struct nfs4_renewdata { 4234 struct nfs_client *client; 4235 unsigned long timestamp; 4236 }; 4237 4238 /* 4239 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 4240 * standalone procedure for queueing an asynchronous RENEW. 4241 */ 4242 static void nfs4_renew_release(void *calldata) 4243 { 4244 struct nfs4_renewdata *data = calldata; 4245 struct nfs_client *clp = data->client; 4246 4247 if (atomic_read(&clp->cl_count) > 1) 4248 nfs4_schedule_state_renewal(clp); 4249 nfs_put_client(clp); 4250 kfree(data); 4251 } 4252 4253 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 4254 { 4255 struct nfs4_renewdata *data = calldata; 4256 struct nfs_client *clp = data->client; 4257 unsigned long timestamp = data->timestamp; 4258 4259 trace_nfs4_renew_async(clp, task->tk_status); 4260 switch (task->tk_status) { 4261 case 0: 4262 break; 4263 case -NFS4ERR_LEASE_MOVED: 4264 nfs4_schedule_lease_moved_recovery(clp); 4265 break; 4266 default: 4267 /* Unless we're shutting down, schedule state recovery! */ 4268 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 4269 return; 4270 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 4271 nfs4_schedule_lease_recovery(clp); 4272 return; 4273 } 4274 nfs4_schedule_path_down_recovery(clp); 4275 } 4276 do_renew_lease(clp, timestamp); 4277 } 4278 4279 static const struct rpc_call_ops nfs4_renew_ops = { 4280 .rpc_call_done = nfs4_renew_done, 4281 .rpc_release = nfs4_renew_release, 4282 }; 4283 4284 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 4285 { 4286 struct rpc_message msg = { 4287 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4288 .rpc_argp = clp, 4289 .rpc_cred = cred, 4290 }; 4291 struct nfs4_renewdata *data; 4292 4293 if (renew_flags == 0) 4294 return 0; 4295 if (!atomic_inc_not_zero(&clp->cl_count)) 4296 return -EIO; 4297 data = kmalloc(sizeof(*data), GFP_NOFS); 4298 if (data == NULL) 4299 return -ENOMEM; 4300 data->client = clp; 4301 data->timestamp = jiffies; 4302 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 4303 &nfs4_renew_ops, data); 4304 } 4305 4306 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 4307 { 4308 struct rpc_message msg = { 4309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 4310 .rpc_argp = clp, 4311 .rpc_cred = cred, 4312 }; 4313 unsigned long now = jiffies; 4314 int status; 4315 4316 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4317 if (status < 0) 4318 return status; 4319 do_renew_lease(clp, now); 4320 return 0; 4321 } 4322 4323 static inline int nfs4_server_supports_acls(struct nfs_server *server) 4324 { 4325 return server->caps & NFS_CAP_ACLS; 4326 } 4327 4328 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 4329 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 4330 * the stack. 4331 */ 4332 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 4333 4334 static int buf_to_pages_noslab(const void *buf, size_t buflen, 4335 struct page **pages, unsigned int *pgbase) 4336 { 4337 struct page *newpage, **spages; 4338 int rc = 0; 4339 size_t len; 4340 spages = pages; 4341 4342 do { 4343 len = min_t(size_t, PAGE_SIZE, buflen); 4344 newpage = alloc_page(GFP_KERNEL); 4345 4346 if (newpage == NULL) 4347 goto unwind; 4348 memcpy(page_address(newpage), buf, len); 4349 buf += len; 4350 buflen -= len; 4351 *pages++ = newpage; 4352 rc++; 4353 } while (buflen != 0); 4354 4355 return rc; 4356 4357 unwind: 4358 for(; rc > 0; rc--) 4359 __free_page(spages[rc-1]); 4360 return -ENOMEM; 4361 } 4362 4363 struct nfs4_cached_acl { 4364 int cached; 4365 size_t len; 4366 char data[0]; 4367 }; 4368 4369 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 4370 { 4371 struct nfs_inode *nfsi = NFS_I(inode); 4372 4373 spin_lock(&inode->i_lock); 4374 kfree(nfsi->nfs4_acl); 4375 nfsi->nfs4_acl = acl; 4376 spin_unlock(&inode->i_lock); 4377 } 4378 4379 static void nfs4_zap_acl_attr(struct inode *inode) 4380 { 4381 nfs4_set_cached_acl(inode, NULL); 4382 } 4383 4384 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 4385 { 4386 struct nfs_inode *nfsi = NFS_I(inode); 4387 struct nfs4_cached_acl *acl; 4388 int ret = -ENOENT; 4389 4390 spin_lock(&inode->i_lock); 4391 acl = nfsi->nfs4_acl; 4392 if (acl == NULL) 4393 goto out; 4394 if (buf == NULL) /* user is just asking for length */ 4395 goto out_len; 4396 if (acl->cached == 0) 4397 goto out; 4398 ret = -ERANGE; /* see getxattr(2) man page */ 4399 if (acl->len > buflen) 4400 goto out; 4401 memcpy(buf, acl->data, acl->len); 4402 out_len: 4403 ret = acl->len; 4404 out: 4405 spin_unlock(&inode->i_lock); 4406 return ret; 4407 } 4408 4409 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 4410 { 4411 struct nfs4_cached_acl *acl; 4412 size_t buflen = sizeof(*acl) + acl_len; 4413 4414 if (buflen <= PAGE_SIZE) { 4415 acl = kmalloc(buflen, GFP_KERNEL); 4416 if (acl == NULL) 4417 goto out; 4418 acl->cached = 1; 4419 _copy_from_pages(acl->data, pages, pgbase, acl_len); 4420 } else { 4421 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 4422 if (acl == NULL) 4423 goto out; 4424 acl->cached = 0; 4425 } 4426 acl->len = acl_len; 4427 out: 4428 nfs4_set_cached_acl(inode, acl); 4429 } 4430 4431 /* 4432 * The getxattr API returns the required buffer length when called with a 4433 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 4434 * the required buf. On a NULL buf, we send a page of data to the server 4435 * guessing that the ACL request can be serviced by a page. If so, we cache 4436 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 4437 * the cache. If not so, we throw away the page, and cache the required 4438 * length. The next getxattr call will then produce another round trip to 4439 * the server, this time with the input buf of the required size. 4440 */ 4441 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4442 { 4443 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 4444 struct nfs_getaclargs args = { 4445 .fh = NFS_FH(inode), 4446 .acl_pages = pages, 4447 .acl_len = buflen, 4448 }; 4449 struct nfs_getaclres res = { 4450 .acl_len = buflen, 4451 }; 4452 struct rpc_message msg = { 4453 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 4454 .rpc_argp = &args, 4455 .rpc_resp = &res, 4456 }; 4457 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4458 int ret = -ENOMEM, i; 4459 4460 /* As long as we're doing a round trip to the server anyway, 4461 * let's be prepared for a page of acl data. */ 4462 if (npages == 0) 4463 npages = 1; 4464 if (npages > ARRAY_SIZE(pages)) 4465 return -ERANGE; 4466 4467 for (i = 0; i < npages; i++) { 4468 pages[i] = alloc_page(GFP_KERNEL); 4469 if (!pages[i]) 4470 goto out_free; 4471 } 4472 4473 /* for decoding across pages */ 4474 res.acl_scratch = alloc_page(GFP_KERNEL); 4475 if (!res.acl_scratch) 4476 goto out_free; 4477 4478 args.acl_len = npages * PAGE_SIZE; 4479 args.acl_pgbase = 0; 4480 4481 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 4482 __func__, buf, buflen, npages, args.acl_len); 4483 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 4484 &msg, &args.seq_args, &res.seq_res, 0); 4485 if (ret) 4486 goto out_free; 4487 4488 /* Handle the case where the passed-in buffer is too short */ 4489 if (res.acl_flags & NFS4_ACL_TRUNC) { 4490 /* Did the user only issue a request for the acl length? */ 4491 if (buf == NULL) 4492 goto out_ok; 4493 ret = -ERANGE; 4494 goto out_free; 4495 } 4496 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 4497 if (buf) { 4498 if (res.acl_len > buflen) { 4499 ret = -ERANGE; 4500 goto out_free; 4501 } 4502 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 4503 } 4504 out_ok: 4505 ret = res.acl_len; 4506 out_free: 4507 for (i = 0; i < npages; i++) 4508 if (pages[i]) 4509 __free_page(pages[i]); 4510 if (res.acl_scratch) 4511 __free_page(res.acl_scratch); 4512 return ret; 4513 } 4514 4515 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 4516 { 4517 struct nfs4_exception exception = { }; 4518 ssize_t ret; 4519 do { 4520 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 4521 trace_nfs4_get_acl(inode, ret); 4522 if (ret >= 0) 4523 break; 4524 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 4525 } while (exception.retry); 4526 return ret; 4527 } 4528 4529 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 4530 { 4531 struct nfs_server *server = NFS_SERVER(inode); 4532 int ret; 4533 4534 if (!nfs4_server_supports_acls(server)) 4535 return -EOPNOTSUPP; 4536 ret = nfs_revalidate_inode(server, inode); 4537 if (ret < 0) 4538 return ret; 4539 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 4540 nfs_zap_acl_cache(inode); 4541 ret = nfs4_read_cached_acl(inode, buf, buflen); 4542 if (ret != -ENOENT) 4543 /* -ENOENT is returned if there is no ACL or if there is an ACL 4544 * but no cached acl data, just the acl length */ 4545 return ret; 4546 return nfs4_get_acl_uncached(inode, buf, buflen); 4547 } 4548 4549 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4550 { 4551 struct nfs_server *server = NFS_SERVER(inode); 4552 struct page *pages[NFS4ACL_MAXPAGES]; 4553 struct nfs_setaclargs arg = { 4554 .fh = NFS_FH(inode), 4555 .acl_pages = pages, 4556 .acl_len = buflen, 4557 }; 4558 struct nfs_setaclres res; 4559 struct rpc_message msg = { 4560 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 4561 .rpc_argp = &arg, 4562 .rpc_resp = &res, 4563 }; 4564 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 4565 int ret, i; 4566 4567 if (!nfs4_server_supports_acls(server)) 4568 return -EOPNOTSUPP; 4569 if (npages > ARRAY_SIZE(pages)) 4570 return -ERANGE; 4571 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 4572 if (i < 0) 4573 return i; 4574 nfs4_inode_return_delegation(inode); 4575 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4576 4577 /* 4578 * Free each page after tx, so the only ref left is 4579 * held by the network stack 4580 */ 4581 for (; i > 0; i--) 4582 put_page(pages[i-1]); 4583 4584 /* 4585 * Acl update can result in inode attribute update. 4586 * so mark the attribute cache invalid. 4587 */ 4588 spin_lock(&inode->i_lock); 4589 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 4590 spin_unlock(&inode->i_lock); 4591 nfs_access_zap_cache(inode); 4592 nfs_zap_acl_cache(inode); 4593 return ret; 4594 } 4595 4596 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 4597 { 4598 struct nfs4_exception exception = { }; 4599 int err; 4600 do { 4601 err = __nfs4_proc_set_acl(inode, buf, buflen); 4602 trace_nfs4_set_acl(inode, err); 4603 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4604 &exception); 4605 } while (exception.retry); 4606 return err; 4607 } 4608 4609 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 4610 static int _nfs4_get_security_label(struct inode *inode, void *buf, 4611 size_t buflen) 4612 { 4613 struct nfs_server *server = NFS_SERVER(inode); 4614 struct nfs_fattr fattr; 4615 struct nfs4_label label = {0, 0, buflen, buf}; 4616 4617 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4618 struct nfs4_getattr_arg arg = { 4619 .fh = NFS_FH(inode), 4620 .bitmask = bitmask, 4621 }; 4622 struct nfs4_getattr_res res = { 4623 .fattr = &fattr, 4624 .label = &label, 4625 .server = server, 4626 }; 4627 struct rpc_message msg = { 4628 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4629 .rpc_argp = &arg, 4630 .rpc_resp = &res, 4631 }; 4632 int ret; 4633 4634 nfs_fattr_init(&fattr); 4635 4636 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 4637 if (ret) 4638 return ret; 4639 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 4640 return -ENOENT; 4641 if (buflen < label.len) 4642 return -ERANGE; 4643 return 0; 4644 } 4645 4646 static int nfs4_get_security_label(struct inode *inode, void *buf, 4647 size_t buflen) 4648 { 4649 struct nfs4_exception exception = { }; 4650 int err; 4651 4652 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4653 return -EOPNOTSUPP; 4654 4655 do { 4656 err = _nfs4_get_security_label(inode, buf, buflen); 4657 trace_nfs4_get_security_label(inode, err); 4658 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4659 &exception); 4660 } while (exception.retry); 4661 return err; 4662 } 4663 4664 static int _nfs4_do_set_security_label(struct inode *inode, 4665 struct nfs4_label *ilabel, 4666 struct nfs_fattr *fattr, 4667 struct nfs4_label *olabel) 4668 { 4669 4670 struct iattr sattr = {0}; 4671 struct nfs_server *server = NFS_SERVER(inode); 4672 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 4673 struct nfs_setattrargs arg = { 4674 .fh = NFS_FH(inode), 4675 .iap = &sattr, 4676 .server = server, 4677 .bitmask = bitmask, 4678 .label = ilabel, 4679 }; 4680 struct nfs_setattrres res = { 4681 .fattr = fattr, 4682 .label = olabel, 4683 .server = server, 4684 }; 4685 struct rpc_message msg = { 4686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 4687 .rpc_argp = &arg, 4688 .rpc_resp = &res, 4689 }; 4690 int status; 4691 4692 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 4693 4694 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4695 if (status) 4696 dprintk("%s failed: %d\n", __func__, status); 4697 4698 return status; 4699 } 4700 4701 static int nfs4_do_set_security_label(struct inode *inode, 4702 struct nfs4_label *ilabel, 4703 struct nfs_fattr *fattr, 4704 struct nfs4_label *olabel) 4705 { 4706 struct nfs4_exception exception = { }; 4707 int err; 4708 4709 do { 4710 err = _nfs4_do_set_security_label(inode, ilabel, 4711 fattr, olabel); 4712 trace_nfs4_set_security_label(inode, err); 4713 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4714 &exception); 4715 } while (exception.retry); 4716 return err; 4717 } 4718 4719 static int 4720 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen) 4721 { 4722 struct nfs4_label ilabel, *olabel = NULL; 4723 struct nfs_fattr fattr; 4724 struct rpc_cred *cred; 4725 struct inode *inode = dentry->d_inode; 4726 int status; 4727 4728 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 4729 return -EOPNOTSUPP; 4730 4731 nfs_fattr_init(&fattr); 4732 4733 ilabel.pi = 0; 4734 ilabel.lfs = 0; 4735 ilabel.label = (char *)buf; 4736 ilabel.len = buflen; 4737 4738 cred = rpc_lookup_cred(); 4739 if (IS_ERR(cred)) 4740 return PTR_ERR(cred); 4741 4742 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 4743 if (IS_ERR(olabel)) { 4744 status = -PTR_ERR(olabel); 4745 goto out; 4746 } 4747 4748 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel); 4749 if (status == 0) 4750 nfs_setsecurity(inode, &fattr, olabel); 4751 4752 nfs4_label_free(olabel); 4753 out: 4754 put_rpccred(cred); 4755 return status; 4756 } 4757 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 4758 4759 4760 static int 4761 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state) 4762 { 4763 struct nfs_client *clp = server->nfs_client; 4764 4765 if (task->tk_status >= 0) 4766 return 0; 4767 switch(task->tk_status) { 4768 case -NFS4ERR_DELEG_REVOKED: 4769 case -NFS4ERR_ADMIN_REVOKED: 4770 case -NFS4ERR_BAD_STATEID: 4771 if (state == NULL) 4772 break; 4773 nfs_remove_bad_delegation(state->inode); 4774 case -NFS4ERR_OPENMODE: 4775 if (state == NULL) 4776 break; 4777 if (nfs4_schedule_stateid_recovery(server, state) < 0) 4778 goto recovery_failed; 4779 goto wait_on_recovery; 4780 case -NFS4ERR_EXPIRED: 4781 if (state != NULL) { 4782 if (nfs4_schedule_stateid_recovery(server, state) < 0) 4783 goto recovery_failed; 4784 } 4785 case -NFS4ERR_STALE_STATEID: 4786 case -NFS4ERR_STALE_CLIENTID: 4787 nfs4_schedule_lease_recovery(clp); 4788 goto wait_on_recovery; 4789 case -NFS4ERR_MOVED: 4790 if (nfs4_schedule_migration_recovery(server) < 0) 4791 goto recovery_failed; 4792 goto wait_on_recovery; 4793 case -NFS4ERR_LEASE_MOVED: 4794 nfs4_schedule_lease_moved_recovery(clp); 4795 goto wait_on_recovery; 4796 #if defined(CONFIG_NFS_V4_1) 4797 case -NFS4ERR_BADSESSION: 4798 case -NFS4ERR_BADSLOT: 4799 case -NFS4ERR_BAD_HIGH_SLOT: 4800 case -NFS4ERR_DEADSESSION: 4801 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 4802 case -NFS4ERR_SEQ_FALSE_RETRY: 4803 case -NFS4ERR_SEQ_MISORDERED: 4804 dprintk("%s ERROR %d, Reset session\n", __func__, 4805 task->tk_status); 4806 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 4807 goto wait_on_recovery; 4808 #endif /* CONFIG_NFS_V4_1 */ 4809 case -NFS4ERR_DELAY: 4810 nfs_inc_server_stats(server, NFSIOS_DELAY); 4811 case -NFS4ERR_GRACE: 4812 rpc_delay(task, NFS4_POLL_RETRY_MAX); 4813 case -NFS4ERR_RETRY_UNCACHED_REP: 4814 case -NFS4ERR_OLD_STATEID: 4815 goto restart_call; 4816 } 4817 task->tk_status = nfs4_map_errors(task->tk_status); 4818 return 0; 4819 recovery_failed: 4820 task->tk_status = -EIO; 4821 return 0; 4822 wait_on_recovery: 4823 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 4824 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 4825 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 4826 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 4827 goto recovery_failed; 4828 restart_call: 4829 task->tk_status = 0; 4830 return -EAGAIN; 4831 } 4832 4833 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 4834 nfs4_verifier *bootverf) 4835 { 4836 __be32 verf[2]; 4837 4838 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 4839 /* An impossible timestamp guarantees this value 4840 * will never match a generated boot time. */ 4841 verf[0] = 0; 4842 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1); 4843 } else { 4844 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 4845 verf[0] = cpu_to_be32(nn->boot_time.tv_sec); 4846 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec); 4847 } 4848 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 4849 } 4850 4851 static unsigned int 4852 nfs4_init_nonuniform_client_string(const struct nfs_client *clp, 4853 char *buf, size_t len) 4854 { 4855 unsigned int result; 4856 4857 rcu_read_lock(); 4858 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s", 4859 clp->cl_ipaddr, 4860 rpc_peeraddr2str(clp->cl_rpcclient, 4861 RPC_DISPLAY_ADDR), 4862 rpc_peeraddr2str(clp->cl_rpcclient, 4863 RPC_DISPLAY_PROTO)); 4864 rcu_read_unlock(); 4865 return result; 4866 } 4867 4868 static unsigned int 4869 nfs4_init_uniform_client_string(const struct nfs_client *clp, 4870 char *buf, size_t len) 4871 { 4872 const char *nodename = clp->cl_rpcclient->cl_nodename; 4873 4874 if (nfs4_client_id_uniquifier[0] != '\0') 4875 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s", 4876 clp->rpc_ops->version, 4877 clp->cl_minorversion, 4878 nfs4_client_id_uniquifier, 4879 nodename); 4880 return scnprintf(buf, len, "Linux NFSv%u.%u %s", 4881 clp->rpc_ops->version, clp->cl_minorversion, 4882 nodename); 4883 } 4884 4885 /* 4886 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 4887 * services. Advertise one based on the address family of the 4888 * clientaddr. 4889 */ 4890 static unsigned int 4891 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 4892 { 4893 if (strchr(clp->cl_ipaddr, ':') != NULL) 4894 return scnprintf(buf, len, "tcp6"); 4895 else 4896 return scnprintf(buf, len, "tcp"); 4897 } 4898 4899 /** 4900 * nfs4_proc_setclientid - Negotiate client ID 4901 * @clp: state data structure 4902 * @program: RPC program for NFSv4 callback service 4903 * @port: IP port number for NFS4 callback service 4904 * @cred: RPC credential to use for this call 4905 * @res: where to place the result 4906 * 4907 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4908 */ 4909 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 4910 unsigned short port, struct rpc_cred *cred, 4911 struct nfs4_setclientid_res *res) 4912 { 4913 nfs4_verifier sc_verifier; 4914 struct nfs4_setclientid setclientid = { 4915 .sc_verifier = &sc_verifier, 4916 .sc_prog = program, 4917 .sc_cb_ident = clp->cl_cb_ident, 4918 }; 4919 struct rpc_message msg = { 4920 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 4921 .rpc_argp = &setclientid, 4922 .rpc_resp = res, 4923 .rpc_cred = cred, 4924 }; 4925 int status; 4926 4927 /* nfs_client_id4 */ 4928 nfs4_init_boot_verifier(clp, &sc_verifier); 4929 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 4930 setclientid.sc_name_len = 4931 nfs4_init_uniform_client_string(clp, 4932 setclientid.sc_name, 4933 sizeof(setclientid.sc_name)); 4934 else 4935 setclientid.sc_name_len = 4936 nfs4_init_nonuniform_client_string(clp, 4937 setclientid.sc_name, 4938 sizeof(setclientid.sc_name)); 4939 /* cb_client4 */ 4940 setclientid.sc_netid_len = 4941 nfs4_init_callback_netid(clp, 4942 setclientid.sc_netid, 4943 sizeof(setclientid.sc_netid)); 4944 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 4945 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 4946 clp->cl_ipaddr, port >> 8, port & 255); 4947 4948 dprintk("NFS call setclientid auth=%s, '%.*s'\n", 4949 clp->cl_rpcclient->cl_auth->au_ops->au_name, 4950 setclientid.sc_name_len, setclientid.sc_name); 4951 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4952 trace_nfs4_setclientid(clp, status); 4953 dprintk("NFS reply setclientid: %d\n", status); 4954 return status; 4955 } 4956 4957 /** 4958 * nfs4_proc_setclientid_confirm - Confirm client ID 4959 * @clp: state data structure 4960 * @res: result of a previous SETCLIENTID 4961 * @cred: RPC credential to use for this call 4962 * 4963 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4964 */ 4965 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 4966 struct nfs4_setclientid_res *arg, 4967 struct rpc_cred *cred) 4968 { 4969 struct rpc_message msg = { 4970 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 4971 .rpc_argp = arg, 4972 .rpc_cred = cred, 4973 }; 4974 int status; 4975 4976 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 4977 clp->cl_rpcclient->cl_auth->au_ops->au_name, 4978 clp->cl_clientid); 4979 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4980 trace_nfs4_setclientid_confirm(clp, status); 4981 dprintk("NFS reply setclientid_confirm: %d\n", status); 4982 return status; 4983 } 4984 4985 struct nfs4_delegreturndata { 4986 struct nfs4_delegreturnargs args; 4987 struct nfs4_delegreturnres res; 4988 struct nfs_fh fh; 4989 nfs4_stateid stateid; 4990 unsigned long timestamp; 4991 struct nfs_fattr fattr; 4992 int rpc_status; 4993 }; 4994 4995 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 4996 { 4997 struct nfs4_delegreturndata *data = calldata; 4998 4999 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5000 return; 5001 5002 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 5003 switch (task->tk_status) { 5004 case 0: 5005 renew_lease(data->res.server, data->timestamp); 5006 break; 5007 case -NFS4ERR_ADMIN_REVOKED: 5008 case -NFS4ERR_DELEG_REVOKED: 5009 case -NFS4ERR_BAD_STATEID: 5010 case -NFS4ERR_OLD_STATEID: 5011 case -NFS4ERR_STALE_STATEID: 5012 case -NFS4ERR_EXPIRED: 5013 task->tk_status = 0; 5014 break; 5015 default: 5016 if (nfs4_async_handle_error(task, data->res.server, NULL) == 5017 -EAGAIN) { 5018 rpc_restart_call_prepare(task); 5019 return; 5020 } 5021 } 5022 data->rpc_status = task->tk_status; 5023 } 5024 5025 static void nfs4_delegreturn_release(void *calldata) 5026 { 5027 kfree(calldata); 5028 } 5029 5030 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 5031 { 5032 struct nfs4_delegreturndata *d_data; 5033 5034 d_data = (struct nfs4_delegreturndata *)data; 5035 5036 nfs4_setup_sequence(d_data->res.server, 5037 &d_data->args.seq_args, 5038 &d_data->res.seq_res, 5039 task); 5040 } 5041 5042 static const struct rpc_call_ops nfs4_delegreturn_ops = { 5043 .rpc_call_prepare = nfs4_delegreturn_prepare, 5044 .rpc_call_done = nfs4_delegreturn_done, 5045 .rpc_release = nfs4_delegreturn_release, 5046 }; 5047 5048 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5049 { 5050 struct nfs4_delegreturndata *data; 5051 struct nfs_server *server = NFS_SERVER(inode); 5052 struct rpc_task *task; 5053 struct rpc_message msg = { 5054 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 5055 .rpc_cred = cred, 5056 }; 5057 struct rpc_task_setup task_setup_data = { 5058 .rpc_client = server->client, 5059 .rpc_message = &msg, 5060 .callback_ops = &nfs4_delegreturn_ops, 5061 .flags = RPC_TASK_ASYNC, 5062 }; 5063 int status = 0; 5064 5065 data = kzalloc(sizeof(*data), GFP_NOFS); 5066 if (data == NULL) 5067 return -ENOMEM; 5068 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 5069 data->args.fhandle = &data->fh; 5070 data->args.stateid = &data->stateid; 5071 data->args.bitmask = server->cache_consistency_bitmask; 5072 nfs_copy_fh(&data->fh, NFS_FH(inode)); 5073 nfs4_stateid_copy(&data->stateid, stateid); 5074 data->res.fattr = &data->fattr; 5075 data->res.server = server; 5076 nfs_fattr_init(data->res.fattr); 5077 data->timestamp = jiffies; 5078 data->rpc_status = 0; 5079 5080 task_setup_data.callback_data = data; 5081 msg.rpc_argp = &data->args; 5082 msg.rpc_resp = &data->res; 5083 task = rpc_run_task(&task_setup_data); 5084 if (IS_ERR(task)) 5085 return PTR_ERR(task); 5086 if (!issync) 5087 goto out; 5088 status = nfs4_wait_for_completion_rpc_task(task); 5089 if (status != 0) 5090 goto out; 5091 status = data->rpc_status; 5092 if (status == 0) 5093 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 5094 else 5095 nfs_refresh_inode(inode, &data->fattr); 5096 out: 5097 rpc_put_task(task); 5098 return status; 5099 } 5100 5101 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 5102 { 5103 struct nfs_server *server = NFS_SERVER(inode); 5104 struct nfs4_exception exception = { }; 5105 int err; 5106 do { 5107 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 5108 trace_nfs4_delegreturn(inode, err); 5109 switch (err) { 5110 case -NFS4ERR_STALE_STATEID: 5111 case -NFS4ERR_EXPIRED: 5112 case 0: 5113 return 0; 5114 } 5115 err = nfs4_handle_exception(server, err, &exception); 5116 } while (exception.retry); 5117 return err; 5118 } 5119 5120 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 5121 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 5122 5123 /* 5124 * sleep, with exponential backoff, and retry the LOCK operation. 5125 */ 5126 static unsigned long 5127 nfs4_set_lock_task_retry(unsigned long timeout) 5128 { 5129 freezable_schedule_timeout_killable_unsafe(timeout); 5130 timeout <<= 1; 5131 if (timeout > NFS4_LOCK_MAXTIMEOUT) 5132 return NFS4_LOCK_MAXTIMEOUT; 5133 return timeout; 5134 } 5135 5136 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5137 { 5138 struct inode *inode = state->inode; 5139 struct nfs_server *server = NFS_SERVER(inode); 5140 struct nfs_client *clp = server->nfs_client; 5141 struct nfs_lockt_args arg = { 5142 .fh = NFS_FH(inode), 5143 .fl = request, 5144 }; 5145 struct nfs_lockt_res res = { 5146 .denied = request, 5147 }; 5148 struct rpc_message msg = { 5149 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 5150 .rpc_argp = &arg, 5151 .rpc_resp = &res, 5152 .rpc_cred = state->owner->so_cred, 5153 }; 5154 struct nfs4_lock_state *lsp; 5155 int status; 5156 5157 arg.lock_owner.clientid = clp->cl_clientid; 5158 status = nfs4_set_lock_state(state, request); 5159 if (status != 0) 5160 goto out; 5161 lsp = request->fl_u.nfs4_fl.owner; 5162 arg.lock_owner.id = lsp->ls_seqid.owner_id; 5163 arg.lock_owner.s_dev = server->s_dev; 5164 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5165 switch (status) { 5166 case 0: 5167 request->fl_type = F_UNLCK; 5168 break; 5169 case -NFS4ERR_DENIED: 5170 status = 0; 5171 } 5172 request->fl_ops->fl_release_private(request); 5173 request->fl_ops = NULL; 5174 out: 5175 return status; 5176 } 5177 5178 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5179 { 5180 struct nfs4_exception exception = { }; 5181 int err; 5182 5183 do { 5184 err = _nfs4_proc_getlk(state, cmd, request); 5185 trace_nfs4_get_lock(request, state, cmd, err); 5186 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 5187 &exception); 5188 } while (exception.retry); 5189 return err; 5190 } 5191 5192 static int do_vfs_lock(struct file *file, struct file_lock *fl) 5193 { 5194 int res = 0; 5195 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 5196 case FL_POSIX: 5197 res = posix_lock_file_wait(file, fl); 5198 break; 5199 case FL_FLOCK: 5200 res = flock_lock_file_wait(file, fl); 5201 break; 5202 default: 5203 BUG(); 5204 } 5205 return res; 5206 } 5207 5208 struct nfs4_unlockdata { 5209 struct nfs_locku_args arg; 5210 struct nfs_locku_res res; 5211 struct nfs4_lock_state *lsp; 5212 struct nfs_open_context *ctx; 5213 struct file_lock fl; 5214 const struct nfs_server *server; 5215 unsigned long timestamp; 5216 }; 5217 5218 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 5219 struct nfs_open_context *ctx, 5220 struct nfs4_lock_state *lsp, 5221 struct nfs_seqid *seqid) 5222 { 5223 struct nfs4_unlockdata *p; 5224 struct inode *inode = lsp->ls_state->inode; 5225 5226 p = kzalloc(sizeof(*p), GFP_NOFS); 5227 if (p == NULL) 5228 return NULL; 5229 p->arg.fh = NFS_FH(inode); 5230 p->arg.fl = &p->fl; 5231 p->arg.seqid = seqid; 5232 p->res.seqid = seqid; 5233 p->arg.stateid = &lsp->ls_stateid; 5234 p->lsp = lsp; 5235 atomic_inc(&lsp->ls_count); 5236 /* Ensure we don't close file until we're done freeing locks! */ 5237 p->ctx = get_nfs_open_context(ctx); 5238 memcpy(&p->fl, fl, sizeof(p->fl)); 5239 p->server = NFS_SERVER(inode); 5240 return p; 5241 } 5242 5243 static void nfs4_locku_release_calldata(void *data) 5244 { 5245 struct nfs4_unlockdata *calldata = data; 5246 nfs_free_seqid(calldata->arg.seqid); 5247 nfs4_put_lock_state(calldata->lsp); 5248 put_nfs_open_context(calldata->ctx); 5249 kfree(calldata); 5250 } 5251 5252 static void nfs4_locku_done(struct rpc_task *task, void *data) 5253 { 5254 struct nfs4_unlockdata *calldata = data; 5255 5256 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 5257 return; 5258 switch (task->tk_status) { 5259 case 0: 5260 nfs4_stateid_copy(&calldata->lsp->ls_stateid, 5261 &calldata->res.stateid); 5262 renew_lease(calldata->server, calldata->timestamp); 5263 break; 5264 case -NFS4ERR_BAD_STATEID: 5265 case -NFS4ERR_OLD_STATEID: 5266 case -NFS4ERR_STALE_STATEID: 5267 case -NFS4ERR_EXPIRED: 5268 break; 5269 default: 5270 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN) 5271 rpc_restart_call_prepare(task); 5272 } 5273 nfs_release_seqid(calldata->arg.seqid); 5274 } 5275 5276 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 5277 { 5278 struct nfs4_unlockdata *calldata = data; 5279 5280 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 5281 goto out_wait; 5282 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 5283 /* Note: exit _without_ running nfs4_locku_done */ 5284 goto out_no_action; 5285 } 5286 calldata->timestamp = jiffies; 5287 if (nfs4_setup_sequence(calldata->server, 5288 &calldata->arg.seq_args, 5289 &calldata->res.seq_res, 5290 task) != 0) 5291 nfs_release_seqid(calldata->arg.seqid); 5292 return; 5293 out_no_action: 5294 task->tk_action = NULL; 5295 out_wait: 5296 nfs4_sequence_done(task, &calldata->res.seq_res); 5297 } 5298 5299 static const struct rpc_call_ops nfs4_locku_ops = { 5300 .rpc_call_prepare = nfs4_locku_prepare, 5301 .rpc_call_done = nfs4_locku_done, 5302 .rpc_release = nfs4_locku_release_calldata, 5303 }; 5304 5305 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 5306 struct nfs_open_context *ctx, 5307 struct nfs4_lock_state *lsp, 5308 struct nfs_seqid *seqid) 5309 { 5310 struct nfs4_unlockdata *data; 5311 struct rpc_message msg = { 5312 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 5313 .rpc_cred = ctx->cred, 5314 }; 5315 struct rpc_task_setup task_setup_data = { 5316 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 5317 .rpc_message = &msg, 5318 .callback_ops = &nfs4_locku_ops, 5319 .workqueue = nfsiod_workqueue, 5320 .flags = RPC_TASK_ASYNC, 5321 }; 5322 5323 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 5324 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 5325 5326 /* Ensure this is an unlock - when canceling a lock, the 5327 * canceled lock is passed in, and it won't be an unlock. 5328 */ 5329 fl->fl_type = F_UNLCK; 5330 5331 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 5332 if (data == NULL) { 5333 nfs_free_seqid(seqid); 5334 return ERR_PTR(-ENOMEM); 5335 } 5336 5337 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5338 msg.rpc_argp = &data->arg; 5339 msg.rpc_resp = &data->res; 5340 task_setup_data.callback_data = data; 5341 return rpc_run_task(&task_setup_data); 5342 } 5343 5344 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 5345 { 5346 struct inode *inode = state->inode; 5347 struct nfs4_state_owner *sp = state->owner; 5348 struct nfs_inode *nfsi = NFS_I(inode); 5349 struct nfs_seqid *seqid; 5350 struct nfs4_lock_state *lsp; 5351 struct rpc_task *task; 5352 int status = 0; 5353 unsigned char fl_flags = request->fl_flags; 5354 5355 status = nfs4_set_lock_state(state, request); 5356 /* Unlock _before_ we do the RPC call */ 5357 request->fl_flags |= FL_EXISTS; 5358 /* Exclude nfs_delegation_claim_locks() */ 5359 mutex_lock(&sp->so_delegreturn_mutex); 5360 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 5361 down_read(&nfsi->rwsem); 5362 if (do_vfs_lock(request->fl_file, request) == -ENOENT) { 5363 up_read(&nfsi->rwsem); 5364 mutex_unlock(&sp->so_delegreturn_mutex); 5365 goto out; 5366 } 5367 up_read(&nfsi->rwsem); 5368 mutex_unlock(&sp->so_delegreturn_mutex); 5369 if (status != 0) 5370 goto out; 5371 /* Is this a delegated lock? */ 5372 lsp = request->fl_u.nfs4_fl.owner; 5373 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 5374 goto out; 5375 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 5376 status = -ENOMEM; 5377 if (seqid == NULL) 5378 goto out; 5379 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 5380 status = PTR_ERR(task); 5381 if (IS_ERR(task)) 5382 goto out; 5383 status = nfs4_wait_for_completion_rpc_task(task); 5384 rpc_put_task(task); 5385 out: 5386 request->fl_flags = fl_flags; 5387 trace_nfs4_unlock(request, state, F_SETLK, status); 5388 return status; 5389 } 5390 5391 struct nfs4_lockdata { 5392 struct nfs_lock_args arg; 5393 struct nfs_lock_res res; 5394 struct nfs4_lock_state *lsp; 5395 struct nfs_open_context *ctx; 5396 struct file_lock fl; 5397 unsigned long timestamp; 5398 int rpc_status; 5399 int cancelled; 5400 struct nfs_server *server; 5401 }; 5402 5403 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 5404 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 5405 gfp_t gfp_mask) 5406 { 5407 struct nfs4_lockdata *p; 5408 struct inode *inode = lsp->ls_state->inode; 5409 struct nfs_server *server = NFS_SERVER(inode); 5410 5411 p = kzalloc(sizeof(*p), gfp_mask); 5412 if (p == NULL) 5413 return NULL; 5414 5415 p->arg.fh = NFS_FH(inode); 5416 p->arg.fl = &p->fl; 5417 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 5418 if (p->arg.open_seqid == NULL) 5419 goto out_free; 5420 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask); 5421 if (p->arg.lock_seqid == NULL) 5422 goto out_free_seqid; 5423 p->arg.lock_stateid = &lsp->ls_stateid; 5424 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 5425 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 5426 p->arg.lock_owner.s_dev = server->s_dev; 5427 p->res.lock_seqid = p->arg.lock_seqid; 5428 p->lsp = lsp; 5429 p->server = server; 5430 atomic_inc(&lsp->ls_count); 5431 p->ctx = get_nfs_open_context(ctx); 5432 memcpy(&p->fl, fl, sizeof(p->fl)); 5433 return p; 5434 out_free_seqid: 5435 nfs_free_seqid(p->arg.open_seqid); 5436 out_free: 5437 kfree(p); 5438 return NULL; 5439 } 5440 5441 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 5442 { 5443 struct nfs4_lockdata *data = calldata; 5444 struct nfs4_state *state = data->lsp->ls_state; 5445 5446 dprintk("%s: begin!\n", __func__); 5447 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 5448 goto out_wait; 5449 /* Do we need to do an open_to_lock_owner? */ 5450 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 5451 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 5452 goto out_release_lock_seqid; 5453 } 5454 data->arg.open_stateid = &state->open_stateid; 5455 data->arg.new_lock_owner = 1; 5456 data->res.open_seqid = data->arg.open_seqid; 5457 } else 5458 data->arg.new_lock_owner = 0; 5459 if (!nfs4_valid_open_stateid(state)) { 5460 data->rpc_status = -EBADF; 5461 task->tk_action = NULL; 5462 goto out_release_open_seqid; 5463 } 5464 data->timestamp = jiffies; 5465 if (nfs4_setup_sequence(data->server, 5466 &data->arg.seq_args, 5467 &data->res.seq_res, 5468 task) == 0) 5469 return; 5470 out_release_open_seqid: 5471 nfs_release_seqid(data->arg.open_seqid); 5472 out_release_lock_seqid: 5473 nfs_release_seqid(data->arg.lock_seqid); 5474 out_wait: 5475 nfs4_sequence_done(task, &data->res.seq_res); 5476 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 5477 } 5478 5479 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 5480 { 5481 struct nfs4_lockdata *data = calldata; 5482 5483 dprintk("%s: begin!\n", __func__); 5484 5485 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5486 return; 5487 5488 data->rpc_status = task->tk_status; 5489 if (data->arg.new_lock_owner != 0) { 5490 if (data->rpc_status == 0) 5491 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 5492 else 5493 goto out; 5494 } 5495 if (data->rpc_status == 0) { 5496 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid); 5497 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags); 5498 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); 5499 } 5500 out: 5501 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 5502 } 5503 5504 static void nfs4_lock_release(void *calldata) 5505 { 5506 struct nfs4_lockdata *data = calldata; 5507 5508 dprintk("%s: begin!\n", __func__); 5509 nfs_free_seqid(data->arg.open_seqid); 5510 if (data->cancelled != 0) { 5511 struct rpc_task *task; 5512 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 5513 data->arg.lock_seqid); 5514 if (!IS_ERR(task)) 5515 rpc_put_task_async(task); 5516 dprintk("%s: cancelling lock!\n", __func__); 5517 } else 5518 nfs_free_seqid(data->arg.lock_seqid); 5519 nfs4_put_lock_state(data->lsp); 5520 put_nfs_open_context(data->ctx); 5521 kfree(data); 5522 dprintk("%s: done!\n", __func__); 5523 } 5524 5525 static const struct rpc_call_ops nfs4_lock_ops = { 5526 .rpc_call_prepare = nfs4_lock_prepare, 5527 .rpc_call_done = nfs4_lock_done, 5528 .rpc_release = nfs4_lock_release, 5529 }; 5530 5531 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 5532 { 5533 switch (error) { 5534 case -NFS4ERR_ADMIN_REVOKED: 5535 case -NFS4ERR_BAD_STATEID: 5536 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5537 if (new_lock_owner != 0 || 5538 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 5539 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 5540 break; 5541 case -NFS4ERR_STALE_STATEID: 5542 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 5543 case -NFS4ERR_EXPIRED: 5544 nfs4_schedule_lease_recovery(server->nfs_client); 5545 }; 5546 } 5547 5548 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 5549 { 5550 struct nfs4_lockdata *data; 5551 struct rpc_task *task; 5552 struct rpc_message msg = { 5553 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 5554 .rpc_cred = state->owner->so_cred, 5555 }; 5556 struct rpc_task_setup task_setup_data = { 5557 .rpc_client = NFS_CLIENT(state->inode), 5558 .rpc_message = &msg, 5559 .callback_ops = &nfs4_lock_ops, 5560 .workqueue = nfsiod_workqueue, 5561 .flags = RPC_TASK_ASYNC, 5562 }; 5563 int ret; 5564 5565 dprintk("%s: begin!\n", __func__); 5566 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 5567 fl->fl_u.nfs4_fl.owner, 5568 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 5569 if (data == NULL) 5570 return -ENOMEM; 5571 if (IS_SETLKW(cmd)) 5572 data->arg.block = 1; 5573 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 5574 msg.rpc_argp = &data->arg; 5575 msg.rpc_resp = &data->res; 5576 task_setup_data.callback_data = data; 5577 if (recovery_type > NFS_LOCK_NEW) { 5578 if (recovery_type == NFS_LOCK_RECLAIM) 5579 data->arg.reclaim = NFS_LOCK_RECLAIM; 5580 nfs4_set_sequence_privileged(&data->arg.seq_args); 5581 } 5582 task = rpc_run_task(&task_setup_data); 5583 if (IS_ERR(task)) 5584 return PTR_ERR(task); 5585 ret = nfs4_wait_for_completion_rpc_task(task); 5586 if (ret == 0) { 5587 ret = data->rpc_status; 5588 if (ret) 5589 nfs4_handle_setlk_error(data->server, data->lsp, 5590 data->arg.new_lock_owner, ret); 5591 } else 5592 data->cancelled = 1; 5593 rpc_put_task(task); 5594 dprintk("%s: done, ret = %d!\n", __func__, ret); 5595 return ret; 5596 } 5597 5598 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 5599 { 5600 struct nfs_server *server = NFS_SERVER(state->inode); 5601 struct nfs4_exception exception = { 5602 .inode = state->inode, 5603 }; 5604 int err; 5605 5606 do { 5607 /* Cache the lock if possible... */ 5608 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5609 return 0; 5610 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 5611 trace_nfs4_lock_reclaim(request, state, F_SETLK, err); 5612 if (err != -NFS4ERR_DELAY) 5613 break; 5614 nfs4_handle_exception(server, err, &exception); 5615 } while (exception.retry); 5616 return err; 5617 } 5618 5619 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 5620 { 5621 struct nfs_server *server = NFS_SERVER(state->inode); 5622 struct nfs4_exception exception = { 5623 .inode = state->inode, 5624 }; 5625 int err; 5626 5627 err = nfs4_set_lock_state(state, request); 5628 if (err != 0) 5629 return err; 5630 if (!recover_lost_locks) { 5631 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 5632 return 0; 5633 } 5634 do { 5635 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 5636 return 0; 5637 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 5638 trace_nfs4_lock_expired(request, state, F_SETLK, err); 5639 switch (err) { 5640 default: 5641 goto out; 5642 case -NFS4ERR_GRACE: 5643 case -NFS4ERR_DELAY: 5644 nfs4_handle_exception(server, err, &exception); 5645 err = 0; 5646 } 5647 } while (exception.retry); 5648 out: 5649 return err; 5650 } 5651 5652 #if defined(CONFIG_NFS_V4_1) 5653 /** 5654 * nfs41_check_expired_locks - possibly free a lock stateid 5655 * 5656 * @state: NFSv4 state for an inode 5657 * 5658 * Returns NFS_OK if recovery for this stateid is now finished. 5659 * Otherwise a negative NFS4ERR value is returned. 5660 */ 5661 static int nfs41_check_expired_locks(struct nfs4_state *state) 5662 { 5663 int status, ret = -NFS4ERR_BAD_STATEID; 5664 struct nfs4_lock_state *lsp; 5665 struct nfs_server *server = NFS_SERVER(state->inode); 5666 5667 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 5668 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 5669 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 5670 5671 status = nfs41_test_stateid(server, 5672 &lsp->ls_stateid, 5673 cred); 5674 trace_nfs4_test_lock_stateid(state, lsp, status); 5675 if (status != NFS_OK) { 5676 /* Free the stateid unless the server 5677 * informs us the stateid is unrecognized. */ 5678 if (status != -NFS4ERR_BAD_STATEID) 5679 nfs41_free_stateid(server, 5680 &lsp->ls_stateid, 5681 cred); 5682 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 5683 ret = status; 5684 } 5685 } 5686 }; 5687 5688 return ret; 5689 } 5690 5691 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 5692 { 5693 int status = NFS_OK; 5694 5695 if (test_bit(LK_STATE_IN_USE, &state->flags)) 5696 status = nfs41_check_expired_locks(state); 5697 if (status != NFS_OK) 5698 status = nfs4_lock_expired(state, request); 5699 return status; 5700 } 5701 #endif 5702 5703 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5704 { 5705 struct nfs4_state_owner *sp = state->owner; 5706 struct nfs_inode *nfsi = NFS_I(state->inode); 5707 unsigned char fl_flags = request->fl_flags; 5708 unsigned int seq; 5709 int status = -ENOLCK; 5710 5711 if ((fl_flags & FL_POSIX) && 5712 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 5713 goto out; 5714 /* Is this a delegated open? */ 5715 status = nfs4_set_lock_state(state, request); 5716 if (status != 0) 5717 goto out; 5718 request->fl_flags |= FL_ACCESS; 5719 status = do_vfs_lock(request->fl_file, request); 5720 if (status < 0) 5721 goto out; 5722 down_read(&nfsi->rwsem); 5723 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 5724 /* Yes: cache locks! */ 5725 /* ...but avoid races with delegation recall... */ 5726 request->fl_flags = fl_flags & ~FL_SLEEP; 5727 status = do_vfs_lock(request->fl_file, request); 5728 goto out_unlock; 5729 } 5730 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 5731 up_read(&nfsi->rwsem); 5732 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 5733 if (status != 0) 5734 goto out; 5735 down_read(&nfsi->rwsem); 5736 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) { 5737 status = -NFS4ERR_DELAY; 5738 goto out_unlock; 5739 } 5740 /* Note: we always want to sleep here! */ 5741 request->fl_flags = fl_flags | FL_SLEEP; 5742 if (do_vfs_lock(request->fl_file, request) < 0) 5743 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock " 5744 "manager!\n", __func__); 5745 out_unlock: 5746 up_read(&nfsi->rwsem); 5747 out: 5748 request->fl_flags = fl_flags; 5749 return status; 5750 } 5751 5752 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 5753 { 5754 struct nfs4_exception exception = { 5755 .state = state, 5756 .inode = state->inode, 5757 }; 5758 int err; 5759 5760 do { 5761 err = _nfs4_proc_setlk(state, cmd, request); 5762 trace_nfs4_set_lock(request, state, cmd, err); 5763 if (err == -NFS4ERR_DENIED) 5764 err = -EAGAIN; 5765 err = nfs4_handle_exception(NFS_SERVER(state->inode), 5766 err, &exception); 5767 } while (exception.retry); 5768 return err; 5769 } 5770 5771 static int 5772 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 5773 { 5774 struct nfs_open_context *ctx; 5775 struct nfs4_state *state; 5776 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 5777 int status; 5778 5779 /* verify open state */ 5780 ctx = nfs_file_open_context(filp); 5781 state = ctx->state; 5782 5783 if (request->fl_start < 0 || request->fl_end < 0) 5784 return -EINVAL; 5785 5786 if (IS_GETLK(cmd)) { 5787 if (state != NULL) 5788 return nfs4_proc_getlk(state, F_GETLK, request); 5789 return 0; 5790 } 5791 5792 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 5793 return -EINVAL; 5794 5795 if (request->fl_type == F_UNLCK) { 5796 if (state != NULL) 5797 return nfs4_proc_unlck(state, cmd, request); 5798 return 0; 5799 } 5800 5801 if (state == NULL) 5802 return -ENOLCK; 5803 /* 5804 * Don't rely on the VFS having checked the file open mode, 5805 * since it won't do this for flock() locks. 5806 */ 5807 switch (request->fl_type) { 5808 case F_RDLCK: 5809 if (!(filp->f_mode & FMODE_READ)) 5810 return -EBADF; 5811 break; 5812 case F_WRLCK: 5813 if (!(filp->f_mode & FMODE_WRITE)) 5814 return -EBADF; 5815 } 5816 5817 do { 5818 status = nfs4_proc_setlk(state, cmd, request); 5819 if ((status != -EAGAIN) || IS_SETLK(cmd)) 5820 break; 5821 timeout = nfs4_set_lock_task_retry(timeout); 5822 status = -ERESTARTSYS; 5823 if (signalled()) 5824 break; 5825 } while(status < 0); 5826 return status; 5827 } 5828 5829 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 5830 { 5831 struct nfs_server *server = NFS_SERVER(state->inode); 5832 int err; 5833 5834 err = nfs4_set_lock_state(state, fl); 5835 if (err != 0) 5836 return err; 5837 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 5838 return nfs4_handle_delegation_recall_error(server, state, stateid, err); 5839 } 5840 5841 struct nfs_release_lockowner_data { 5842 struct nfs4_lock_state *lsp; 5843 struct nfs_server *server; 5844 struct nfs_release_lockowner_args args; 5845 struct nfs_release_lockowner_res res; 5846 unsigned long timestamp; 5847 }; 5848 5849 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 5850 { 5851 struct nfs_release_lockowner_data *data = calldata; 5852 nfs40_setup_sequence(data->server, 5853 &data->args.seq_args, &data->res.seq_res, task); 5854 data->timestamp = jiffies; 5855 } 5856 5857 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 5858 { 5859 struct nfs_release_lockowner_data *data = calldata; 5860 struct nfs_server *server = data->server; 5861 5862 nfs40_sequence_done(task, &data->res.seq_res); 5863 5864 switch (task->tk_status) { 5865 case 0: 5866 renew_lease(server, data->timestamp); 5867 break; 5868 case -NFS4ERR_STALE_CLIENTID: 5869 case -NFS4ERR_EXPIRED: 5870 case -NFS4ERR_LEASE_MOVED: 5871 case -NFS4ERR_DELAY: 5872 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) 5873 rpc_restart_call_prepare(task); 5874 } 5875 } 5876 5877 static void nfs4_release_lockowner_release(void *calldata) 5878 { 5879 struct nfs_release_lockowner_data *data = calldata; 5880 nfs4_free_lock_state(data->server, data->lsp); 5881 kfree(calldata); 5882 } 5883 5884 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 5885 .rpc_call_prepare = nfs4_release_lockowner_prepare, 5886 .rpc_call_done = nfs4_release_lockowner_done, 5887 .rpc_release = nfs4_release_lockowner_release, 5888 }; 5889 5890 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 5891 { 5892 struct nfs_release_lockowner_data *data; 5893 struct rpc_message msg = { 5894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 5895 }; 5896 5897 if (server->nfs_client->cl_mvops->minor_version != 0) 5898 return -EINVAL; 5899 5900 data = kmalloc(sizeof(*data), GFP_NOFS); 5901 if (!data) 5902 return -ENOMEM; 5903 data->lsp = lsp; 5904 data->server = server; 5905 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 5906 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 5907 data->args.lock_owner.s_dev = server->s_dev; 5908 5909 msg.rpc_argp = &data->args; 5910 msg.rpc_resp = &data->res; 5911 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 5912 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 5913 return 0; 5914 } 5915 5916 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 5917 5918 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key, 5919 const void *buf, size_t buflen, 5920 int flags, int type) 5921 { 5922 if (strcmp(key, "") != 0) 5923 return -EINVAL; 5924 5925 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen); 5926 } 5927 5928 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key, 5929 void *buf, size_t buflen, int type) 5930 { 5931 if (strcmp(key, "") != 0) 5932 return -EINVAL; 5933 5934 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen); 5935 } 5936 5937 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list, 5938 size_t list_len, const char *name, 5939 size_t name_len, int type) 5940 { 5941 size_t len = sizeof(XATTR_NAME_NFSV4_ACL); 5942 5943 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 5944 return 0; 5945 5946 if (list && len <= list_len) 5947 memcpy(list, XATTR_NAME_NFSV4_ACL, len); 5948 return len; 5949 } 5950 5951 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 5952 static inline int nfs4_server_supports_labels(struct nfs_server *server) 5953 { 5954 return server->caps & NFS_CAP_SECURITY_LABEL; 5955 } 5956 5957 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key, 5958 const void *buf, size_t buflen, 5959 int flags, int type) 5960 { 5961 if (security_ismaclabel(key)) 5962 return nfs4_set_security_label(dentry, buf, buflen); 5963 5964 return -EOPNOTSUPP; 5965 } 5966 5967 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key, 5968 void *buf, size_t buflen, int type) 5969 { 5970 if (security_ismaclabel(key)) 5971 return nfs4_get_security_label(dentry->d_inode, buf, buflen); 5972 return -EOPNOTSUPP; 5973 } 5974 5975 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list, 5976 size_t list_len, const char *name, 5977 size_t name_len, int type) 5978 { 5979 size_t len = 0; 5980 5981 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) { 5982 len = security_inode_listsecurity(dentry->d_inode, NULL, 0); 5983 if (list && len <= list_len) 5984 security_inode_listsecurity(dentry->d_inode, list, len); 5985 } 5986 return len; 5987 } 5988 5989 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 5990 .prefix = XATTR_SECURITY_PREFIX, 5991 .list = nfs4_xattr_list_nfs4_label, 5992 .get = nfs4_xattr_get_nfs4_label, 5993 .set = nfs4_xattr_set_nfs4_label, 5994 }; 5995 #endif 5996 5997 5998 /* 5999 * nfs_fhget will use either the mounted_on_fileid or the fileid 6000 */ 6001 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 6002 { 6003 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 6004 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 6005 (fattr->valid & NFS_ATTR_FATTR_FSID) && 6006 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 6007 return; 6008 6009 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 6010 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 6011 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 6012 fattr->nlink = 2; 6013 } 6014 6015 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6016 const struct qstr *name, 6017 struct nfs4_fs_locations *fs_locations, 6018 struct page *page) 6019 { 6020 struct nfs_server *server = NFS_SERVER(dir); 6021 u32 bitmask[3] = { 6022 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6023 }; 6024 struct nfs4_fs_locations_arg args = { 6025 .dir_fh = NFS_FH(dir), 6026 .name = name, 6027 .page = page, 6028 .bitmask = bitmask, 6029 }; 6030 struct nfs4_fs_locations_res res = { 6031 .fs_locations = fs_locations, 6032 }; 6033 struct rpc_message msg = { 6034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6035 .rpc_argp = &args, 6036 .rpc_resp = &res, 6037 }; 6038 int status; 6039 6040 dprintk("%s: start\n", __func__); 6041 6042 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 6043 * is not supported */ 6044 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 6045 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 6046 else 6047 bitmask[0] |= FATTR4_WORD0_FILEID; 6048 6049 nfs_fattr_init(&fs_locations->fattr); 6050 fs_locations->server = server; 6051 fs_locations->nlocations = 0; 6052 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 6053 dprintk("%s: returned status = %d\n", __func__, status); 6054 return status; 6055 } 6056 6057 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 6058 const struct qstr *name, 6059 struct nfs4_fs_locations *fs_locations, 6060 struct page *page) 6061 { 6062 struct nfs4_exception exception = { }; 6063 int err; 6064 do { 6065 err = _nfs4_proc_fs_locations(client, dir, name, 6066 fs_locations, page); 6067 trace_nfs4_get_fs_locations(dir, name, err); 6068 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6069 &exception); 6070 } while (exception.retry); 6071 return err; 6072 } 6073 6074 /* 6075 * This operation also signals the server that this client is 6076 * performing migration recovery. The server can stop returning 6077 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 6078 * appended to this compound to identify the client ID which is 6079 * performing recovery. 6080 */ 6081 static int _nfs40_proc_get_locations(struct inode *inode, 6082 struct nfs4_fs_locations *locations, 6083 struct page *page, struct rpc_cred *cred) 6084 { 6085 struct nfs_server *server = NFS_SERVER(inode); 6086 struct rpc_clnt *clnt = server->client; 6087 u32 bitmask[2] = { 6088 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6089 }; 6090 struct nfs4_fs_locations_arg args = { 6091 .clientid = server->nfs_client->cl_clientid, 6092 .fh = NFS_FH(inode), 6093 .page = page, 6094 .bitmask = bitmask, 6095 .migration = 1, /* skip LOOKUP */ 6096 .renew = 1, /* append RENEW */ 6097 }; 6098 struct nfs4_fs_locations_res res = { 6099 .fs_locations = locations, 6100 .migration = 1, 6101 .renew = 1, 6102 }; 6103 struct rpc_message msg = { 6104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6105 .rpc_argp = &args, 6106 .rpc_resp = &res, 6107 .rpc_cred = cred, 6108 }; 6109 unsigned long now = jiffies; 6110 int status; 6111 6112 nfs_fattr_init(&locations->fattr); 6113 locations->server = server; 6114 locations->nlocations = 0; 6115 6116 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6117 nfs4_set_sequence_privileged(&args.seq_args); 6118 status = nfs4_call_sync_sequence(clnt, server, &msg, 6119 &args.seq_args, &res.seq_res); 6120 if (status) 6121 return status; 6122 6123 renew_lease(server, now); 6124 return 0; 6125 } 6126 6127 #ifdef CONFIG_NFS_V4_1 6128 6129 /* 6130 * This operation also signals the server that this client is 6131 * performing migration recovery. The server can stop asserting 6132 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 6133 * performing this operation is identified in the SEQUENCE 6134 * operation in this compound. 6135 * 6136 * When the client supports GETATTR(fs_locations_info), it can 6137 * be plumbed in here. 6138 */ 6139 static int _nfs41_proc_get_locations(struct inode *inode, 6140 struct nfs4_fs_locations *locations, 6141 struct page *page, struct rpc_cred *cred) 6142 { 6143 struct nfs_server *server = NFS_SERVER(inode); 6144 struct rpc_clnt *clnt = server->client; 6145 u32 bitmask[2] = { 6146 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 6147 }; 6148 struct nfs4_fs_locations_arg args = { 6149 .fh = NFS_FH(inode), 6150 .page = page, 6151 .bitmask = bitmask, 6152 .migration = 1, /* skip LOOKUP */ 6153 }; 6154 struct nfs4_fs_locations_res res = { 6155 .fs_locations = locations, 6156 .migration = 1, 6157 }; 6158 struct rpc_message msg = { 6159 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 6160 .rpc_argp = &args, 6161 .rpc_resp = &res, 6162 .rpc_cred = cred, 6163 }; 6164 int status; 6165 6166 nfs_fattr_init(&locations->fattr); 6167 locations->server = server; 6168 locations->nlocations = 0; 6169 6170 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6171 nfs4_set_sequence_privileged(&args.seq_args); 6172 status = nfs4_call_sync_sequence(clnt, server, &msg, 6173 &args.seq_args, &res.seq_res); 6174 if (status == NFS4_OK && 6175 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6176 status = -NFS4ERR_LEASE_MOVED; 6177 return status; 6178 } 6179 6180 #endif /* CONFIG_NFS_V4_1 */ 6181 6182 /** 6183 * nfs4_proc_get_locations - discover locations for a migrated FSID 6184 * @inode: inode on FSID that is migrating 6185 * @locations: result of query 6186 * @page: buffer 6187 * @cred: credential to use for this operation 6188 * 6189 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 6190 * operation failed, or a negative errno if a local error occurred. 6191 * 6192 * On success, "locations" is filled in, but if the server has 6193 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 6194 * asserted. 6195 * 6196 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 6197 * from this client that require migration recovery. 6198 */ 6199 int nfs4_proc_get_locations(struct inode *inode, 6200 struct nfs4_fs_locations *locations, 6201 struct page *page, struct rpc_cred *cred) 6202 { 6203 struct nfs_server *server = NFS_SERVER(inode); 6204 struct nfs_client *clp = server->nfs_client; 6205 const struct nfs4_mig_recovery_ops *ops = 6206 clp->cl_mvops->mig_recovery_ops; 6207 struct nfs4_exception exception = { }; 6208 int status; 6209 6210 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6211 (unsigned long long)server->fsid.major, 6212 (unsigned long long)server->fsid.minor, 6213 clp->cl_hostname); 6214 nfs_display_fhandle(NFS_FH(inode), __func__); 6215 6216 do { 6217 status = ops->get_locations(inode, locations, page, cred); 6218 if (status != -NFS4ERR_DELAY) 6219 break; 6220 nfs4_handle_exception(server, status, &exception); 6221 } while (exception.retry); 6222 return status; 6223 } 6224 6225 /* 6226 * This operation also signals the server that this client is 6227 * performing "lease moved" recovery. The server can stop 6228 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 6229 * is appended to this compound to identify the client ID which is 6230 * performing recovery. 6231 */ 6232 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6233 { 6234 struct nfs_server *server = NFS_SERVER(inode); 6235 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 6236 struct rpc_clnt *clnt = server->client; 6237 struct nfs4_fsid_present_arg args = { 6238 .fh = NFS_FH(inode), 6239 .clientid = clp->cl_clientid, 6240 .renew = 1, /* append RENEW */ 6241 }; 6242 struct nfs4_fsid_present_res res = { 6243 .renew = 1, 6244 }; 6245 struct rpc_message msg = { 6246 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6247 .rpc_argp = &args, 6248 .rpc_resp = &res, 6249 .rpc_cred = cred, 6250 }; 6251 unsigned long now = jiffies; 6252 int status; 6253 6254 res.fh = nfs_alloc_fhandle(); 6255 if (res.fh == NULL) 6256 return -ENOMEM; 6257 6258 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6259 nfs4_set_sequence_privileged(&args.seq_args); 6260 status = nfs4_call_sync_sequence(clnt, server, &msg, 6261 &args.seq_args, &res.seq_res); 6262 nfs_free_fhandle(res.fh); 6263 if (status) 6264 return status; 6265 6266 do_renew_lease(clp, now); 6267 return 0; 6268 } 6269 6270 #ifdef CONFIG_NFS_V4_1 6271 6272 /* 6273 * This operation also signals the server that this client is 6274 * performing "lease moved" recovery. The server can stop asserting 6275 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 6276 * this operation is identified in the SEQUENCE operation in this 6277 * compound. 6278 */ 6279 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6280 { 6281 struct nfs_server *server = NFS_SERVER(inode); 6282 struct rpc_clnt *clnt = server->client; 6283 struct nfs4_fsid_present_arg args = { 6284 .fh = NFS_FH(inode), 6285 }; 6286 struct nfs4_fsid_present_res res = { 6287 }; 6288 struct rpc_message msg = { 6289 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 6290 .rpc_argp = &args, 6291 .rpc_resp = &res, 6292 .rpc_cred = cred, 6293 }; 6294 int status; 6295 6296 res.fh = nfs_alloc_fhandle(); 6297 if (res.fh == NULL) 6298 return -ENOMEM; 6299 6300 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 6301 nfs4_set_sequence_privileged(&args.seq_args); 6302 status = nfs4_call_sync_sequence(clnt, server, &msg, 6303 &args.seq_args, &res.seq_res); 6304 nfs_free_fhandle(res.fh); 6305 if (status == NFS4_OK && 6306 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 6307 status = -NFS4ERR_LEASE_MOVED; 6308 return status; 6309 } 6310 6311 #endif /* CONFIG_NFS_V4_1 */ 6312 6313 /** 6314 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 6315 * @inode: inode on FSID to check 6316 * @cred: credential to use for this operation 6317 * 6318 * Server indicates whether the FSID is present, moved, or not 6319 * recognized. This operation is necessary to clear a LEASE_MOVED 6320 * condition for this client ID. 6321 * 6322 * Returns NFS4_OK if the FSID is present on this server, 6323 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 6324 * NFS4ERR code if some error occurred on the server, or a 6325 * negative errno if a local failure occurred. 6326 */ 6327 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred) 6328 { 6329 struct nfs_server *server = NFS_SERVER(inode); 6330 struct nfs_client *clp = server->nfs_client; 6331 const struct nfs4_mig_recovery_ops *ops = 6332 clp->cl_mvops->mig_recovery_ops; 6333 struct nfs4_exception exception = { }; 6334 int status; 6335 6336 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 6337 (unsigned long long)server->fsid.major, 6338 (unsigned long long)server->fsid.minor, 6339 clp->cl_hostname); 6340 nfs_display_fhandle(NFS_FH(inode), __func__); 6341 6342 do { 6343 status = ops->fsid_present(inode, cred); 6344 if (status != -NFS4ERR_DELAY) 6345 break; 6346 nfs4_handle_exception(server, status, &exception); 6347 } while (exception.retry); 6348 return status; 6349 } 6350 6351 /** 6352 * If 'use_integrity' is true and the state managment nfs_client 6353 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 6354 * and the machine credential as per RFC3530bis and RFC5661 Security 6355 * Considerations sections. Otherwise, just use the user cred with the 6356 * filesystem's rpc_client. 6357 */ 6358 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 6359 { 6360 int status; 6361 struct nfs4_secinfo_arg args = { 6362 .dir_fh = NFS_FH(dir), 6363 .name = name, 6364 }; 6365 struct nfs4_secinfo_res res = { 6366 .flavors = flavors, 6367 }; 6368 struct rpc_message msg = { 6369 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 6370 .rpc_argp = &args, 6371 .rpc_resp = &res, 6372 }; 6373 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 6374 struct rpc_cred *cred = NULL; 6375 6376 if (use_integrity) { 6377 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient; 6378 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client); 6379 msg.rpc_cred = cred; 6380 } 6381 6382 dprintk("NFS call secinfo %s\n", name->name); 6383 6384 nfs4_state_protect(NFS_SERVER(dir)->nfs_client, 6385 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 6386 6387 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, 6388 &res.seq_res, 0); 6389 dprintk("NFS reply secinfo: %d\n", status); 6390 6391 if (cred) 6392 put_rpccred(cred); 6393 6394 return status; 6395 } 6396 6397 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 6398 struct nfs4_secinfo_flavors *flavors) 6399 { 6400 struct nfs4_exception exception = { }; 6401 int err; 6402 do { 6403 err = -NFS4ERR_WRONGSEC; 6404 6405 /* try to use integrity protection with machine cred */ 6406 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 6407 err = _nfs4_proc_secinfo(dir, name, flavors, true); 6408 6409 /* 6410 * if unable to use integrity protection, or SECINFO with 6411 * integrity protection returns NFS4ERR_WRONGSEC (which is 6412 * disallowed by spec, but exists in deployed servers) use 6413 * the current filesystem's rpc_client and the user cred. 6414 */ 6415 if (err == -NFS4ERR_WRONGSEC) 6416 err = _nfs4_proc_secinfo(dir, name, flavors, false); 6417 6418 trace_nfs4_secinfo(dir, name, err); 6419 err = nfs4_handle_exception(NFS_SERVER(dir), err, 6420 &exception); 6421 } while (exception.retry); 6422 return err; 6423 } 6424 6425 #ifdef CONFIG_NFS_V4_1 6426 /* 6427 * Check the exchange flags returned by the server for invalid flags, having 6428 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 6429 * DS flags set. 6430 */ 6431 static int nfs4_check_cl_exchange_flags(u32 flags) 6432 { 6433 if (flags & ~EXCHGID4_FLAG_MASK_R) 6434 goto out_inval; 6435 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 6436 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 6437 goto out_inval; 6438 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 6439 goto out_inval; 6440 return NFS_OK; 6441 out_inval: 6442 return -NFS4ERR_INVAL; 6443 } 6444 6445 static bool 6446 nfs41_same_server_scope(struct nfs41_server_scope *a, 6447 struct nfs41_server_scope *b) 6448 { 6449 if (a->server_scope_sz == b->server_scope_sz && 6450 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 6451 return true; 6452 6453 return false; 6454 } 6455 6456 /* 6457 * nfs4_proc_bind_conn_to_session() 6458 * 6459 * The 4.1 client currently uses the same TCP connection for the 6460 * fore and backchannel. 6461 */ 6462 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 6463 { 6464 int status; 6465 struct nfs41_bind_conn_to_session_res res; 6466 struct rpc_message msg = { 6467 .rpc_proc = 6468 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 6469 .rpc_argp = clp, 6470 .rpc_resp = &res, 6471 .rpc_cred = cred, 6472 }; 6473 6474 dprintk("--> %s\n", __func__); 6475 6476 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS); 6477 if (unlikely(res.session == NULL)) { 6478 status = -ENOMEM; 6479 goto out; 6480 } 6481 6482 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6483 trace_nfs4_bind_conn_to_session(clp, status); 6484 if (status == 0) { 6485 if (memcmp(res.session->sess_id.data, 6486 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 6487 dprintk("NFS: %s: Session ID mismatch\n", __func__); 6488 status = -EIO; 6489 goto out_session; 6490 } 6491 if (res.dir != NFS4_CDFS4_BOTH) { 6492 dprintk("NFS: %s: Unexpected direction from server\n", 6493 __func__); 6494 status = -EIO; 6495 goto out_session; 6496 } 6497 if (res.use_conn_in_rdma_mode) { 6498 dprintk("NFS: %s: Server returned RDMA mode = true\n", 6499 __func__); 6500 status = -EIO; 6501 goto out_session; 6502 } 6503 } 6504 out_session: 6505 kfree(res.session); 6506 out: 6507 dprintk("<-- %s status= %d\n", __func__, status); 6508 return status; 6509 } 6510 6511 /* 6512 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 6513 * and operations we'd like to see to enable certain features in the allow map 6514 */ 6515 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 6516 .how = SP4_MACH_CRED, 6517 .enforce.u.words = { 6518 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6519 1 << (OP_EXCHANGE_ID - 32) | 6520 1 << (OP_CREATE_SESSION - 32) | 6521 1 << (OP_DESTROY_SESSION - 32) | 6522 1 << (OP_DESTROY_CLIENTID - 32) 6523 }, 6524 .allow.u.words = { 6525 [0] = 1 << (OP_CLOSE) | 6526 1 << (OP_LOCKU) | 6527 1 << (OP_COMMIT), 6528 [1] = 1 << (OP_SECINFO - 32) | 6529 1 << (OP_SECINFO_NO_NAME - 32) | 6530 1 << (OP_TEST_STATEID - 32) | 6531 1 << (OP_FREE_STATEID - 32) | 6532 1 << (OP_WRITE - 32) 6533 } 6534 }; 6535 6536 /* 6537 * Select the state protection mode for client `clp' given the server results 6538 * from exchange_id in `sp'. 6539 * 6540 * Returns 0 on success, negative errno otherwise. 6541 */ 6542 static int nfs4_sp4_select_mode(struct nfs_client *clp, 6543 struct nfs41_state_protection *sp) 6544 { 6545 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 6546 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 6547 1 << (OP_EXCHANGE_ID - 32) | 6548 1 << (OP_CREATE_SESSION - 32) | 6549 1 << (OP_DESTROY_SESSION - 32) | 6550 1 << (OP_DESTROY_CLIENTID - 32) 6551 }; 6552 unsigned int i; 6553 6554 if (sp->how == SP4_MACH_CRED) { 6555 /* Print state protect result */ 6556 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 6557 for (i = 0; i <= LAST_NFS4_OP; i++) { 6558 if (test_bit(i, sp->enforce.u.longs)) 6559 dfprintk(MOUNT, " enforce op %d\n", i); 6560 if (test_bit(i, sp->allow.u.longs)) 6561 dfprintk(MOUNT, " allow op %d\n", i); 6562 } 6563 6564 /* make sure nothing is on enforce list that isn't supported */ 6565 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 6566 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 6567 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6568 return -EINVAL; 6569 } 6570 } 6571 6572 /* 6573 * Minimal mode - state operations are allowed to use machine 6574 * credential. Note this already happens by default, so the 6575 * client doesn't have to do anything more than the negotiation. 6576 * 6577 * NOTE: we don't care if EXCHANGE_ID is in the list - 6578 * we're already using the machine cred for exchange_id 6579 * and will never use a different cred. 6580 */ 6581 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 6582 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 6583 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 6584 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 6585 dfprintk(MOUNT, "sp4_mach_cred:\n"); 6586 dfprintk(MOUNT, " minimal mode enabled\n"); 6587 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags); 6588 } else { 6589 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 6590 return -EINVAL; 6591 } 6592 6593 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 6594 test_bit(OP_LOCKU, sp->allow.u.longs)) { 6595 dfprintk(MOUNT, " cleanup mode enabled\n"); 6596 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags); 6597 } 6598 6599 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 6600 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 6601 dfprintk(MOUNT, " secinfo mode enabled\n"); 6602 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags); 6603 } 6604 6605 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 6606 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 6607 dfprintk(MOUNT, " stateid mode enabled\n"); 6608 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags); 6609 } 6610 6611 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 6612 dfprintk(MOUNT, " write mode enabled\n"); 6613 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags); 6614 } 6615 6616 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 6617 dfprintk(MOUNT, " commit mode enabled\n"); 6618 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags); 6619 } 6620 } 6621 6622 return 0; 6623 } 6624 6625 /* 6626 * _nfs4_proc_exchange_id() 6627 * 6628 * Wrapper for EXCHANGE_ID operation. 6629 */ 6630 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, 6631 u32 sp4_how) 6632 { 6633 nfs4_verifier verifier; 6634 struct nfs41_exchange_id_args args = { 6635 .verifier = &verifier, 6636 .client = clp, 6637 #ifdef CONFIG_NFS_V4_1_MIGRATION 6638 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6639 EXCHGID4_FLAG_BIND_PRINC_STATEID | 6640 EXCHGID4_FLAG_SUPP_MOVED_MIGR, 6641 #else 6642 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 6643 EXCHGID4_FLAG_BIND_PRINC_STATEID, 6644 #endif 6645 }; 6646 struct nfs41_exchange_id_res res = { 6647 0 6648 }; 6649 int status; 6650 struct rpc_message msg = { 6651 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 6652 .rpc_argp = &args, 6653 .rpc_resp = &res, 6654 .rpc_cred = cred, 6655 }; 6656 6657 nfs4_init_boot_verifier(clp, &verifier); 6658 args.id_len = nfs4_init_uniform_client_string(clp, args.id, 6659 sizeof(args.id)); 6660 dprintk("NFS call exchange_id auth=%s, '%.*s'\n", 6661 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6662 args.id_len, args.id); 6663 6664 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 6665 GFP_NOFS); 6666 if (unlikely(res.server_owner == NULL)) { 6667 status = -ENOMEM; 6668 goto out; 6669 } 6670 6671 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 6672 GFP_NOFS); 6673 if (unlikely(res.server_scope == NULL)) { 6674 status = -ENOMEM; 6675 goto out_server_owner; 6676 } 6677 6678 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 6679 if (unlikely(res.impl_id == NULL)) { 6680 status = -ENOMEM; 6681 goto out_server_scope; 6682 } 6683 6684 switch (sp4_how) { 6685 case SP4_NONE: 6686 args.state_protect.how = SP4_NONE; 6687 break; 6688 6689 case SP4_MACH_CRED: 6690 args.state_protect = nfs4_sp4_mach_cred_request; 6691 break; 6692 6693 default: 6694 /* unsupported! */ 6695 WARN_ON_ONCE(1); 6696 status = -EINVAL; 6697 goto out_server_scope; 6698 } 6699 6700 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6701 trace_nfs4_exchange_id(clp, status); 6702 if (status == 0) 6703 status = nfs4_check_cl_exchange_flags(res.flags); 6704 6705 if (status == 0) 6706 status = nfs4_sp4_select_mode(clp, &res.state_protect); 6707 6708 if (status == 0) { 6709 clp->cl_clientid = res.clientid; 6710 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R); 6711 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) 6712 clp->cl_seqid = res.seqid; 6713 6714 kfree(clp->cl_serverowner); 6715 clp->cl_serverowner = res.server_owner; 6716 res.server_owner = NULL; 6717 6718 /* use the most recent implementation id */ 6719 kfree(clp->cl_implid); 6720 clp->cl_implid = res.impl_id; 6721 6722 if (clp->cl_serverscope != NULL && 6723 !nfs41_same_server_scope(clp->cl_serverscope, 6724 res.server_scope)) { 6725 dprintk("%s: server_scope mismatch detected\n", 6726 __func__); 6727 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 6728 kfree(clp->cl_serverscope); 6729 clp->cl_serverscope = NULL; 6730 } 6731 6732 if (clp->cl_serverscope == NULL) { 6733 clp->cl_serverscope = res.server_scope; 6734 goto out; 6735 } 6736 } else 6737 kfree(res.impl_id); 6738 6739 out_server_owner: 6740 kfree(res.server_owner); 6741 out_server_scope: 6742 kfree(res.server_scope); 6743 out: 6744 if (clp->cl_implid != NULL) 6745 dprintk("NFS reply exchange_id: Server Implementation ID: " 6746 "domain: %s, name: %s, date: %llu,%u\n", 6747 clp->cl_implid->domain, clp->cl_implid->name, 6748 clp->cl_implid->date.seconds, 6749 clp->cl_implid->date.nseconds); 6750 dprintk("NFS reply exchange_id: %d\n", status); 6751 return status; 6752 } 6753 6754 /* 6755 * nfs4_proc_exchange_id() 6756 * 6757 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6758 * 6759 * Since the clientid has expired, all compounds using sessions 6760 * associated with the stale clientid will be returning 6761 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 6762 * be in some phase of session reset. 6763 * 6764 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 6765 */ 6766 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 6767 { 6768 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 6769 int status; 6770 6771 /* try SP4_MACH_CRED if krb5i/p */ 6772 if (authflavor == RPC_AUTH_GSS_KRB5I || 6773 authflavor == RPC_AUTH_GSS_KRB5P) { 6774 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 6775 if (!status) 6776 return 0; 6777 } 6778 6779 /* try SP4_NONE */ 6780 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 6781 } 6782 6783 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 6784 struct rpc_cred *cred) 6785 { 6786 struct rpc_message msg = { 6787 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 6788 .rpc_argp = clp, 6789 .rpc_cred = cred, 6790 }; 6791 int status; 6792 6793 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 6794 trace_nfs4_destroy_clientid(clp, status); 6795 if (status) 6796 dprintk("NFS: Got error %d from the server %s on " 6797 "DESTROY_CLIENTID.", status, clp->cl_hostname); 6798 return status; 6799 } 6800 6801 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 6802 struct rpc_cred *cred) 6803 { 6804 unsigned int loop; 6805 int ret; 6806 6807 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 6808 ret = _nfs4_proc_destroy_clientid(clp, cred); 6809 switch (ret) { 6810 case -NFS4ERR_DELAY: 6811 case -NFS4ERR_CLIENTID_BUSY: 6812 ssleep(1); 6813 break; 6814 default: 6815 return ret; 6816 } 6817 } 6818 return 0; 6819 } 6820 6821 int nfs4_destroy_clientid(struct nfs_client *clp) 6822 { 6823 struct rpc_cred *cred; 6824 int ret = 0; 6825 6826 if (clp->cl_mvops->minor_version < 1) 6827 goto out; 6828 if (clp->cl_exchange_flags == 0) 6829 goto out; 6830 if (clp->cl_preserve_clid) 6831 goto out; 6832 cred = nfs4_get_clid_cred(clp); 6833 ret = nfs4_proc_destroy_clientid(clp, cred); 6834 if (cred) 6835 put_rpccred(cred); 6836 switch (ret) { 6837 case 0: 6838 case -NFS4ERR_STALE_CLIENTID: 6839 clp->cl_exchange_flags = 0; 6840 } 6841 out: 6842 return ret; 6843 } 6844 6845 struct nfs4_get_lease_time_data { 6846 struct nfs4_get_lease_time_args *args; 6847 struct nfs4_get_lease_time_res *res; 6848 struct nfs_client *clp; 6849 }; 6850 6851 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 6852 void *calldata) 6853 { 6854 struct nfs4_get_lease_time_data *data = 6855 (struct nfs4_get_lease_time_data *)calldata; 6856 6857 dprintk("--> %s\n", __func__); 6858 /* just setup sequence, do not trigger session recovery 6859 since we're invoked within one */ 6860 nfs41_setup_sequence(data->clp->cl_session, 6861 &data->args->la_seq_args, 6862 &data->res->lr_seq_res, 6863 task); 6864 dprintk("<-- %s\n", __func__); 6865 } 6866 6867 /* 6868 * Called from nfs4_state_manager thread for session setup, so don't recover 6869 * from sequence operation or clientid errors. 6870 */ 6871 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 6872 { 6873 struct nfs4_get_lease_time_data *data = 6874 (struct nfs4_get_lease_time_data *)calldata; 6875 6876 dprintk("--> %s\n", __func__); 6877 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 6878 return; 6879 switch (task->tk_status) { 6880 case -NFS4ERR_DELAY: 6881 case -NFS4ERR_GRACE: 6882 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 6883 rpc_delay(task, NFS4_POLL_RETRY_MIN); 6884 task->tk_status = 0; 6885 /* fall through */ 6886 case -NFS4ERR_RETRY_UNCACHED_REP: 6887 rpc_restart_call_prepare(task); 6888 return; 6889 } 6890 dprintk("<-- %s\n", __func__); 6891 } 6892 6893 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 6894 .rpc_call_prepare = nfs4_get_lease_time_prepare, 6895 .rpc_call_done = nfs4_get_lease_time_done, 6896 }; 6897 6898 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 6899 { 6900 struct rpc_task *task; 6901 struct nfs4_get_lease_time_args args; 6902 struct nfs4_get_lease_time_res res = { 6903 .lr_fsinfo = fsinfo, 6904 }; 6905 struct nfs4_get_lease_time_data data = { 6906 .args = &args, 6907 .res = &res, 6908 .clp = clp, 6909 }; 6910 struct rpc_message msg = { 6911 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 6912 .rpc_argp = &args, 6913 .rpc_resp = &res, 6914 }; 6915 struct rpc_task_setup task_setup = { 6916 .rpc_client = clp->cl_rpcclient, 6917 .rpc_message = &msg, 6918 .callback_ops = &nfs4_get_lease_time_ops, 6919 .callback_data = &data, 6920 .flags = RPC_TASK_TIMEOUT, 6921 }; 6922 int status; 6923 6924 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 6925 nfs4_set_sequence_privileged(&args.la_seq_args); 6926 dprintk("--> %s\n", __func__); 6927 task = rpc_run_task(&task_setup); 6928 6929 if (IS_ERR(task)) 6930 status = PTR_ERR(task); 6931 else { 6932 status = task->tk_status; 6933 rpc_put_task(task); 6934 } 6935 dprintk("<-- %s return %d\n", __func__, status); 6936 6937 return status; 6938 } 6939 6940 /* 6941 * Initialize the values to be used by the client in CREATE_SESSION 6942 * If nfs4_init_session set the fore channel request and response sizes, 6943 * use them. 6944 * 6945 * Set the back channel max_resp_sz_cached to zero to force the client to 6946 * always set csa_cachethis to FALSE because the current implementation 6947 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 6948 */ 6949 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 6950 { 6951 unsigned int max_rqst_sz, max_resp_sz; 6952 6953 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 6954 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 6955 6956 /* Fore channel attributes */ 6957 args->fc_attrs.max_rqst_sz = max_rqst_sz; 6958 args->fc_attrs.max_resp_sz = max_resp_sz; 6959 args->fc_attrs.max_ops = NFS4_MAX_OPS; 6960 args->fc_attrs.max_reqs = max_session_slots; 6961 6962 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 6963 "max_ops=%u max_reqs=%u\n", 6964 __func__, 6965 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 6966 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 6967 6968 /* Back channel attributes */ 6969 args->bc_attrs.max_rqst_sz = PAGE_SIZE; 6970 args->bc_attrs.max_resp_sz = PAGE_SIZE; 6971 args->bc_attrs.max_resp_sz_cached = 0; 6972 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 6973 args->bc_attrs.max_reqs = 1; 6974 6975 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 6976 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 6977 __func__, 6978 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 6979 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 6980 args->bc_attrs.max_reqs); 6981 } 6982 6983 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 6984 { 6985 struct nfs4_channel_attrs *sent = &args->fc_attrs; 6986 struct nfs4_channel_attrs *rcvd = &session->fc_attrs; 6987 6988 if (rcvd->max_resp_sz > sent->max_resp_sz) 6989 return -EINVAL; 6990 /* 6991 * Our requested max_ops is the minimum we need; we're not 6992 * prepared to break up compounds into smaller pieces than that. 6993 * So, no point even trying to continue if the server won't 6994 * cooperate: 6995 */ 6996 if (rcvd->max_ops < sent->max_ops) 6997 return -EINVAL; 6998 if (rcvd->max_reqs == 0) 6999 return -EINVAL; 7000 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 7001 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 7002 return 0; 7003 } 7004 7005 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 7006 { 7007 struct nfs4_channel_attrs *sent = &args->bc_attrs; 7008 struct nfs4_channel_attrs *rcvd = &session->bc_attrs; 7009 7010 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 7011 return -EINVAL; 7012 if (rcvd->max_resp_sz < sent->max_resp_sz) 7013 return -EINVAL; 7014 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 7015 return -EINVAL; 7016 /* These would render the backchannel useless: */ 7017 if (rcvd->max_ops != sent->max_ops) 7018 return -EINVAL; 7019 if (rcvd->max_reqs != sent->max_reqs) 7020 return -EINVAL; 7021 return 0; 7022 } 7023 7024 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 7025 struct nfs4_session *session) 7026 { 7027 int ret; 7028 7029 ret = nfs4_verify_fore_channel_attrs(args, session); 7030 if (ret) 7031 return ret; 7032 return nfs4_verify_back_channel_attrs(args, session); 7033 } 7034 7035 static int _nfs4_proc_create_session(struct nfs_client *clp, 7036 struct rpc_cred *cred) 7037 { 7038 struct nfs4_session *session = clp->cl_session; 7039 struct nfs41_create_session_args args = { 7040 .client = clp, 7041 .cb_program = NFS4_CALLBACK, 7042 }; 7043 struct nfs41_create_session_res res = { 7044 .client = clp, 7045 }; 7046 struct rpc_message msg = { 7047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 7048 .rpc_argp = &args, 7049 .rpc_resp = &res, 7050 .rpc_cred = cred, 7051 }; 7052 int status; 7053 7054 nfs4_init_channel_attrs(&args); 7055 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 7056 7057 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7058 trace_nfs4_create_session(clp, status); 7059 7060 if (!status) { 7061 /* Verify the session's negotiated channel_attrs values */ 7062 status = nfs4_verify_channel_attrs(&args, session); 7063 /* Increment the clientid slot sequence id */ 7064 clp->cl_seqid++; 7065 } 7066 7067 return status; 7068 } 7069 7070 /* 7071 * Issues a CREATE_SESSION operation to the server. 7072 * It is the responsibility of the caller to verify the session is 7073 * expired before calling this routine. 7074 */ 7075 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 7076 { 7077 int status; 7078 unsigned *ptr; 7079 struct nfs4_session *session = clp->cl_session; 7080 7081 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 7082 7083 status = _nfs4_proc_create_session(clp, cred); 7084 if (status) 7085 goto out; 7086 7087 /* Init or reset the session slot tables */ 7088 status = nfs4_setup_session_slot_tables(session); 7089 dprintk("slot table setup returned %d\n", status); 7090 if (status) 7091 goto out; 7092 7093 ptr = (unsigned *)&session->sess_id.data[0]; 7094 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 7095 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 7096 out: 7097 dprintk("<-- %s\n", __func__); 7098 return status; 7099 } 7100 7101 /* 7102 * Issue the over-the-wire RPC DESTROY_SESSION. 7103 * The caller must serialize access to this routine. 7104 */ 7105 int nfs4_proc_destroy_session(struct nfs4_session *session, 7106 struct rpc_cred *cred) 7107 { 7108 struct rpc_message msg = { 7109 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 7110 .rpc_argp = session, 7111 .rpc_cred = cred, 7112 }; 7113 int status = 0; 7114 7115 dprintk("--> nfs4_proc_destroy_session\n"); 7116 7117 /* session is still being setup */ 7118 if (session->clp->cl_cons_state != NFS_CS_READY) 7119 return status; 7120 7121 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 7122 trace_nfs4_destroy_session(session->clp, status); 7123 7124 if (status) 7125 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 7126 "Session has been destroyed regardless...\n", status); 7127 7128 dprintk("<-- nfs4_proc_destroy_session\n"); 7129 return status; 7130 } 7131 7132 /* 7133 * Renew the cl_session lease. 7134 */ 7135 struct nfs4_sequence_data { 7136 struct nfs_client *clp; 7137 struct nfs4_sequence_args args; 7138 struct nfs4_sequence_res res; 7139 }; 7140 7141 static void nfs41_sequence_release(void *data) 7142 { 7143 struct nfs4_sequence_data *calldata = data; 7144 struct nfs_client *clp = calldata->clp; 7145 7146 if (atomic_read(&clp->cl_count) > 1) 7147 nfs4_schedule_state_renewal(clp); 7148 nfs_put_client(clp); 7149 kfree(calldata); 7150 } 7151 7152 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7153 { 7154 switch(task->tk_status) { 7155 case -NFS4ERR_DELAY: 7156 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7157 return -EAGAIN; 7158 default: 7159 nfs4_schedule_lease_recovery(clp); 7160 } 7161 return 0; 7162 } 7163 7164 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 7165 { 7166 struct nfs4_sequence_data *calldata = data; 7167 struct nfs_client *clp = calldata->clp; 7168 7169 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 7170 return; 7171 7172 trace_nfs4_sequence(clp, task->tk_status); 7173 if (task->tk_status < 0) { 7174 dprintk("%s ERROR %d\n", __func__, task->tk_status); 7175 if (atomic_read(&clp->cl_count) == 1) 7176 goto out; 7177 7178 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 7179 rpc_restart_call_prepare(task); 7180 return; 7181 } 7182 } 7183 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 7184 out: 7185 dprintk("<-- %s\n", __func__); 7186 } 7187 7188 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 7189 { 7190 struct nfs4_sequence_data *calldata = data; 7191 struct nfs_client *clp = calldata->clp; 7192 struct nfs4_sequence_args *args; 7193 struct nfs4_sequence_res *res; 7194 7195 args = task->tk_msg.rpc_argp; 7196 res = task->tk_msg.rpc_resp; 7197 7198 nfs41_setup_sequence(clp->cl_session, args, res, task); 7199 } 7200 7201 static const struct rpc_call_ops nfs41_sequence_ops = { 7202 .rpc_call_done = nfs41_sequence_call_done, 7203 .rpc_call_prepare = nfs41_sequence_prepare, 7204 .rpc_release = nfs41_sequence_release, 7205 }; 7206 7207 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 7208 struct rpc_cred *cred, 7209 bool is_privileged) 7210 { 7211 struct nfs4_sequence_data *calldata; 7212 struct rpc_message msg = { 7213 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 7214 .rpc_cred = cred, 7215 }; 7216 struct rpc_task_setup task_setup_data = { 7217 .rpc_client = clp->cl_rpcclient, 7218 .rpc_message = &msg, 7219 .callback_ops = &nfs41_sequence_ops, 7220 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 7221 }; 7222 7223 if (!atomic_inc_not_zero(&clp->cl_count)) 7224 return ERR_PTR(-EIO); 7225 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7226 if (calldata == NULL) { 7227 nfs_put_client(clp); 7228 return ERR_PTR(-ENOMEM); 7229 } 7230 nfs4_init_sequence(&calldata->args, &calldata->res, 0); 7231 if (is_privileged) 7232 nfs4_set_sequence_privileged(&calldata->args); 7233 msg.rpc_argp = &calldata->args; 7234 msg.rpc_resp = &calldata->res; 7235 calldata->clp = clp; 7236 task_setup_data.callback_data = calldata; 7237 7238 return rpc_run_task(&task_setup_data); 7239 } 7240 7241 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 7242 { 7243 struct rpc_task *task; 7244 int ret = 0; 7245 7246 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 7247 return 0; 7248 task = _nfs41_proc_sequence(clp, cred, false); 7249 if (IS_ERR(task)) 7250 ret = PTR_ERR(task); 7251 else 7252 rpc_put_task_async(task); 7253 dprintk("<-- %s status=%d\n", __func__, ret); 7254 return ret; 7255 } 7256 7257 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 7258 { 7259 struct rpc_task *task; 7260 int ret; 7261 7262 task = _nfs41_proc_sequence(clp, cred, true); 7263 if (IS_ERR(task)) { 7264 ret = PTR_ERR(task); 7265 goto out; 7266 } 7267 ret = rpc_wait_for_completion_task(task); 7268 if (!ret) { 7269 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp; 7270 7271 if (task->tk_status == 0) 7272 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 7273 ret = task->tk_status; 7274 } 7275 rpc_put_task(task); 7276 out: 7277 dprintk("<-- %s status=%d\n", __func__, ret); 7278 return ret; 7279 } 7280 7281 struct nfs4_reclaim_complete_data { 7282 struct nfs_client *clp; 7283 struct nfs41_reclaim_complete_args arg; 7284 struct nfs41_reclaim_complete_res res; 7285 }; 7286 7287 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 7288 { 7289 struct nfs4_reclaim_complete_data *calldata = data; 7290 7291 nfs41_setup_sequence(calldata->clp->cl_session, 7292 &calldata->arg.seq_args, 7293 &calldata->res.seq_res, 7294 task); 7295 } 7296 7297 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 7298 { 7299 switch(task->tk_status) { 7300 case 0: 7301 case -NFS4ERR_COMPLETE_ALREADY: 7302 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 7303 break; 7304 case -NFS4ERR_DELAY: 7305 rpc_delay(task, NFS4_POLL_RETRY_MAX); 7306 /* fall through */ 7307 case -NFS4ERR_RETRY_UNCACHED_REP: 7308 return -EAGAIN; 7309 default: 7310 nfs4_schedule_lease_recovery(clp); 7311 } 7312 return 0; 7313 } 7314 7315 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 7316 { 7317 struct nfs4_reclaim_complete_data *calldata = data; 7318 struct nfs_client *clp = calldata->clp; 7319 struct nfs4_sequence_res *res = &calldata->res.seq_res; 7320 7321 dprintk("--> %s\n", __func__); 7322 if (!nfs41_sequence_done(task, res)) 7323 return; 7324 7325 trace_nfs4_reclaim_complete(clp, task->tk_status); 7326 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 7327 rpc_restart_call_prepare(task); 7328 return; 7329 } 7330 dprintk("<-- %s\n", __func__); 7331 } 7332 7333 static void nfs4_free_reclaim_complete_data(void *data) 7334 { 7335 struct nfs4_reclaim_complete_data *calldata = data; 7336 7337 kfree(calldata); 7338 } 7339 7340 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 7341 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 7342 .rpc_call_done = nfs4_reclaim_complete_done, 7343 .rpc_release = nfs4_free_reclaim_complete_data, 7344 }; 7345 7346 /* 7347 * Issue a global reclaim complete. 7348 */ 7349 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 7350 struct rpc_cred *cred) 7351 { 7352 struct nfs4_reclaim_complete_data *calldata; 7353 struct rpc_task *task; 7354 struct rpc_message msg = { 7355 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 7356 .rpc_cred = cred, 7357 }; 7358 struct rpc_task_setup task_setup_data = { 7359 .rpc_client = clp->cl_rpcclient, 7360 .rpc_message = &msg, 7361 .callback_ops = &nfs4_reclaim_complete_call_ops, 7362 .flags = RPC_TASK_ASYNC, 7363 }; 7364 int status = -ENOMEM; 7365 7366 dprintk("--> %s\n", __func__); 7367 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 7368 if (calldata == NULL) 7369 goto out; 7370 calldata->clp = clp; 7371 calldata->arg.one_fs = 0; 7372 7373 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 7374 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 7375 msg.rpc_argp = &calldata->arg; 7376 msg.rpc_resp = &calldata->res; 7377 task_setup_data.callback_data = calldata; 7378 task = rpc_run_task(&task_setup_data); 7379 if (IS_ERR(task)) { 7380 status = PTR_ERR(task); 7381 goto out; 7382 } 7383 status = nfs4_wait_for_completion_rpc_task(task); 7384 if (status == 0) 7385 status = task->tk_status; 7386 rpc_put_task(task); 7387 return 0; 7388 out: 7389 dprintk("<-- %s status=%d\n", __func__, status); 7390 return status; 7391 } 7392 7393 static void 7394 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 7395 { 7396 struct nfs4_layoutget *lgp = calldata; 7397 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 7398 struct nfs4_session *session = nfs4_get_session(server); 7399 7400 dprintk("--> %s\n", __func__); 7401 /* Note the is a race here, where a CB_LAYOUTRECALL can come in 7402 * right now covering the LAYOUTGET we are about to send. 7403 * However, that is not so catastrophic, and there seems 7404 * to be no way to prevent it completely. 7405 */ 7406 if (nfs41_setup_sequence(session, &lgp->args.seq_args, 7407 &lgp->res.seq_res, task)) 7408 return; 7409 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid, 7410 NFS_I(lgp->args.inode)->layout, 7411 lgp->args.ctx->state)) { 7412 rpc_exit(task, NFS4_OK); 7413 } 7414 } 7415 7416 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 7417 { 7418 struct nfs4_layoutget *lgp = calldata; 7419 struct inode *inode = lgp->args.inode; 7420 struct nfs_server *server = NFS_SERVER(inode); 7421 struct pnfs_layout_hdr *lo; 7422 struct nfs4_state *state = NULL; 7423 unsigned long timeo, now, giveup; 7424 7425 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 7426 7427 if (!nfs41_sequence_done(task, &lgp->res.seq_res)) 7428 goto out; 7429 7430 switch (task->tk_status) { 7431 case 0: 7432 goto out; 7433 /* 7434 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 7435 * (or clients) writing to the same RAID stripe 7436 */ 7437 case -NFS4ERR_LAYOUTTRYLATER: 7438 /* 7439 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall 7440 * existing layout before getting a new one). 7441 */ 7442 case -NFS4ERR_RECALLCONFLICT: 7443 timeo = rpc_get_timeout(task->tk_client); 7444 giveup = lgp->args.timestamp + timeo; 7445 now = jiffies; 7446 if (time_after(giveup, now)) { 7447 unsigned long delay; 7448 7449 /* Delay for: 7450 * - Not less then NFS4_POLL_RETRY_MIN. 7451 * - One last time a jiffie before we give up 7452 * - exponential backoff (time_now minus start_attempt) 7453 */ 7454 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN, 7455 min((giveup - now - 1), 7456 now - lgp->args.timestamp)); 7457 7458 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n", 7459 __func__, delay); 7460 rpc_delay(task, delay); 7461 task->tk_status = 0; 7462 rpc_restart_call_prepare(task); 7463 goto out; /* Do not call nfs4_async_handle_error() */ 7464 } 7465 break; 7466 case -NFS4ERR_EXPIRED: 7467 case -NFS4ERR_BAD_STATEID: 7468 spin_lock(&inode->i_lock); 7469 lo = NFS_I(inode)->layout; 7470 if (!lo || list_empty(&lo->plh_segs)) { 7471 spin_unlock(&inode->i_lock); 7472 /* If the open stateid was bad, then recover it. */ 7473 state = lgp->args.ctx->state; 7474 } else { 7475 LIST_HEAD(head); 7476 7477 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL); 7478 spin_unlock(&inode->i_lock); 7479 /* Mark the bad layout state as invalid, then 7480 * retry using the open stateid. */ 7481 pnfs_free_lseg_list(&head); 7482 } 7483 } 7484 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) 7485 rpc_restart_call_prepare(task); 7486 out: 7487 dprintk("<-- %s\n", __func__); 7488 } 7489 7490 static size_t max_response_pages(struct nfs_server *server) 7491 { 7492 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 7493 return nfs_page_array_len(0, max_resp_sz); 7494 } 7495 7496 static void nfs4_free_pages(struct page **pages, size_t size) 7497 { 7498 int i; 7499 7500 if (!pages) 7501 return; 7502 7503 for (i = 0; i < size; i++) { 7504 if (!pages[i]) 7505 break; 7506 __free_page(pages[i]); 7507 } 7508 kfree(pages); 7509 } 7510 7511 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 7512 { 7513 struct page **pages; 7514 int i; 7515 7516 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 7517 if (!pages) { 7518 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 7519 return NULL; 7520 } 7521 7522 for (i = 0; i < size; i++) { 7523 pages[i] = alloc_page(gfp_flags); 7524 if (!pages[i]) { 7525 dprintk("%s: failed to allocate page\n", __func__); 7526 nfs4_free_pages(pages, size); 7527 return NULL; 7528 } 7529 } 7530 7531 return pages; 7532 } 7533 7534 static void nfs4_layoutget_release(void *calldata) 7535 { 7536 struct nfs4_layoutget *lgp = calldata; 7537 struct inode *inode = lgp->args.inode; 7538 struct nfs_server *server = NFS_SERVER(inode); 7539 size_t max_pages = max_response_pages(server); 7540 7541 dprintk("--> %s\n", __func__); 7542 nfs4_free_pages(lgp->args.layout.pages, max_pages); 7543 pnfs_put_layout_hdr(NFS_I(inode)->layout); 7544 put_nfs_open_context(lgp->args.ctx); 7545 kfree(calldata); 7546 dprintk("<-- %s\n", __func__); 7547 } 7548 7549 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 7550 .rpc_call_prepare = nfs4_layoutget_prepare, 7551 .rpc_call_done = nfs4_layoutget_done, 7552 .rpc_release = nfs4_layoutget_release, 7553 }; 7554 7555 struct pnfs_layout_segment * 7556 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) 7557 { 7558 struct inode *inode = lgp->args.inode; 7559 struct nfs_server *server = NFS_SERVER(inode); 7560 size_t max_pages = max_response_pages(server); 7561 struct rpc_task *task; 7562 struct rpc_message msg = { 7563 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 7564 .rpc_argp = &lgp->args, 7565 .rpc_resp = &lgp->res, 7566 .rpc_cred = lgp->cred, 7567 }; 7568 struct rpc_task_setup task_setup_data = { 7569 .rpc_client = server->client, 7570 .rpc_message = &msg, 7571 .callback_ops = &nfs4_layoutget_call_ops, 7572 .callback_data = lgp, 7573 .flags = RPC_TASK_ASYNC, 7574 }; 7575 struct pnfs_layout_segment *lseg = NULL; 7576 int status = 0; 7577 7578 dprintk("--> %s\n", __func__); 7579 7580 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 7581 if (!lgp->args.layout.pages) { 7582 nfs4_layoutget_release(lgp); 7583 return ERR_PTR(-ENOMEM); 7584 } 7585 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 7586 lgp->args.timestamp = jiffies; 7587 7588 lgp->res.layoutp = &lgp->args.layout; 7589 lgp->res.seq_res.sr_slot = NULL; 7590 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 7591 7592 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ 7593 pnfs_get_layout_hdr(NFS_I(inode)->layout); 7594 7595 task = rpc_run_task(&task_setup_data); 7596 if (IS_ERR(task)) 7597 return ERR_CAST(task); 7598 status = nfs4_wait_for_completion_rpc_task(task); 7599 if (status == 0) 7600 status = task->tk_status; 7601 trace_nfs4_layoutget(lgp->args.ctx, 7602 &lgp->args.range, 7603 &lgp->res.range, 7604 status); 7605 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */ 7606 if (status == 0 && lgp->res.layoutp->len) 7607 lseg = pnfs_layout_process(lgp); 7608 rpc_put_task(task); 7609 dprintk("<-- %s status=%d\n", __func__, status); 7610 if (status) 7611 return ERR_PTR(status); 7612 return lseg; 7613 } 7614 7615 static void 7616 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 7617 { 7618 struct nfs4_layoutreturn *lrp = calldata; 7619 7620 dprintk("--> %s\n", __func__); 7621 nfs41_setup_sequence(lrp->clp->cl_session, 7622 &lrp->args.seq_args, 7623 &lrp->res.seq_res, 7624 task); 7625 } 7626 7627 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 7628 { 7629 struct nfs4_layoutreturn *lrp = calldata; 7630 struct nfs_server *server; 7631 7632 dprintk("--> %s\n", __func__); 7633 7634 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 7635 return; 7636 7637 server = NFS_SERVER(lrp->args.inode); 7638 switch (task->tk_status) { 7639 default: 7640 task->tk_status = 0; 7641 case 0: 7642 break; 7643 case -NFS4ERR_DELAY: 7644 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN) 7645 break; 7646 rpc_restart_call_prepare(task); 7647 return; 7648 } 7649 dprintk("<-- %s\n", __func__); 7650 } 7651 7652 static void nfs4_layoutreturn_release(void *calldata) 7653 { 7654 struct nfs4_layoutreturn *lrp = calldata; 7655 struct pnfs_layout_hdr *lo = lrp->args.layout; 7656 7657 dprintk("--> %s\n", __func__); 7658 spin_lock(&lo->plh_inode->i_lock); 7659 if (lrp->res.lrs_present) 7660 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 7661 lo->plh_block_lgets--; 7662 spin_unlock(&lo->plh_inode->i_lock); 7663 pnfs_put_layout_hdr(lrp->args.layout); 7664 kfree(calldata); 7665 dprintk("<-- %s\n", __func__); 7666 } 7667 7668 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 7669 .rpc_call_prepare = nfs4_layoutreturn_prepare, 7670 .rpc_call_done = nfs4_layoutreturn_done, 7671 .rpc_release = nfs4_layoutreturn_release, 7672 }; 7673 7674 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp) 7675 { 7676 struct rpc_task *task; 7677 struct rpc_message msg = { 7678 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 7679 .rpc_argp = &lrp->args, 7680 .rpc_resp = &lrp->res, 7681 .rpc_cred = lrp->cred, 7682 }; 7683 struct rpc_task_setup task_setup_data = { 7684 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 7685 .rpc_message = &msg, 7686 .callback_ops = &nfs4_layoutreturn_call_ops, 7687 .callback_data = lrp, 7688 }; 7689 int status; 7690 7691 dprintk("--> %s\n", __func__); 7692 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 7693 task = rpc_run_task(&task_setup_data); 7694 if (IS_ERR(task)) 7695 return PTR_ERR(task); 7696 status = task->tk_status; 7697 trace_nfs4_layoutreturn(lrp->args.inode, status); 7698 dprintk("<-- %s status=%d\n", __func__, status); 7699 rpc_put_task(task); 7700 return status; 7701 } 7702 7703 /* 7704 * Retrieve the list of Data Server devices from the MDS. 7705 */ 7706 static int _nfs4_getdevicelist(struct nfs_server *server, 7707 const struct nfs_fh *fh, 7708 struct pnfs_devicelist *devlist) 7709 { 7710 struct nfs4_getdevicelist_args args = { 7711 .fh = fh, 7712 .layoutclass = server->pnfs_curr_ld->id, 7713 }; 7714 struct nfs4_getdevicelist_res res = { 7715 .devlist = devlist, 7716 }; 7717 struct rpc_message msg = { 7718 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST], 7719 .rpc_argp = &args, 7720 .rpc_resp = &res, 7721 }; 7722 int status; 7723 7724 dprintk("--> %s\n", __func__); 7725 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 7726 &res.seq_res, 0); 7727 dprintk("<-- %s status=%d\n", __func__, status); 7728 return status; 7729 } 7730 7731 int nfs4_proc_getdevicelist(struct nfs_server *server, 7732 const struct nfs_fh *fh, 7733 struct pnfs_devicelist *devlist) 7734 { 7735 struct nfs4_exception exception = { }; 7736 int err; 7737 7738 do { 7739 err = nfs4_handle_exception(server, 7740 _nfs4_getdevicelist(server, fh, devlist), 7741 &exception); 7742 } while (exception.retry); 7743 7744 dprintk("%s: err=%d, num_devs=%u\n", __func__, 7745 err, devlist->num_devs); 7746 7747 return err; 7748 } 7749 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist); 7750 7751 static int 7752 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 7753 struct pnfs_device *pdev, 7754 struct rpc_cred *cred) 7755 { 7756 struct nfs4_getdeviceinfo_args args = { 7757 .pdev = pdev, 7758 }; 7759 struct nfs4_getdeviceinfo_res res = { 7760 .pdev = pdev, 7761 }; 7762 struct rpc_message msg = { 7763 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 7764 .rpc_argp = &args, 7765 .rpc_resp = &res, 7766 .rpc_cred = cred, 7767 }; 7768 int status; 7769 7770 dprintk("--> %s\n", __func__); 7771 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 7772 dprintk("<-- %s status=%d\n", __func__, status); 7773 7774 return status; 7775 } 7776 7777 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 7778 struct pnfs_device *pdev, 7779 struct rpc_cred *cred) 7780 { 7781 struct nfs4_exception exception = { }; 7782 int err; 7783 7784 do { 7785 err = nfs4_handle_exception(server, 7786 _nfs4_proc_getdeviceinfo(server, pdev, cred), 7787 &exception); 7788 } while (exception.retry); 7789 return err; 7790 } 7791 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 7792 7793 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 7794 { 7795 struct nfs4_layoutcommit_data *data = calldata; 7796 struct nfs_server *server = NFS_SERVER(data->args.inode); 7797 struct nfs4_session *session = nfs4_get_session(server); 7798 7799 nfs41_setup_sequence(session, 7800 &data->args.seq_args, 7801 &data->res.seq_res, 7802 task); 7803 } 7804 7805 static void 7806 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 7807 { 7808 struct nfs4_layoutcommit_data *data = calldata; 7809 struct nfs_server *server = NFS_SERVER(data->args.inode); 7810 7811 if (!nfs41_sequence_done(task, &data->res.seq_res)) 7812 return; 7813 7814 switch (task->tk_status) { /* Just ignore these failures */ 7815 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 7816 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 7817 case -NFS4ERR_BADLAYOUT: /* no layout */ 7818 case -NFS4ERR_GRACE: /* loca_recalim always false */ 7819 task->tk_status = 0; 7820 case 0: 7821 break; 7822 default: 7823 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { 7824 rpc_restart_call_prepare(task); 7825 return; 7826 } 7827 } 7828 } 7829 7830 static void nfs4_layoutcommit_release(void *calldata) 7831 { 7832 struct nfs4_layoutcommit_data *data = calldata; 7833 7834 pnfs_cleanup_layoutcommit(data); 7835 nfs_post_op_update_inode_force_wcc(data->args.inode, 7836 data->res.fattr); 7837 put_rpccred(data->cred); 7838 kfree(data); 7839 } 7840 7841 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 7842 .rpc_call_prepare = nfs4_layoutcommit_prepare, 7843 .rpc_call_done = nfs4_layoutcommit_done, 7844 .rpc_release = nfs4_layoutcommit_release, 7845 }; 7846 7847 int 7848 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 7849 { 7850 struct rpc_message msg = { 7851 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 7852 .rpc_argp = &data->args, 7853 .rpc_resp = &data->res, 7854 .rpc_cred = data->cred, 7855 }; 7856 struct rpc_task_setup task_setup_data = { 7857 .task = &data->task, 7858 .rpc_client = NFS_CLIENT(data->args.inode), 7859 .rpc_message = &msg, 7860 .callback_ops = &nfs4_layoutcommit_ops, 7861 .callback_data = data, 7862 .flags = RPC_TASK_ASYNC, 7863 }; 7864 struct rpc_task *task; 7865 int status = 0; 7866 7867 dprintk("NFS: %4d initiating layoutcommit call. sync %d " 7868 "lbw: %llu inode %lu\n", 7869 data->task.tk_pid, sync, 7870 data->args.lastbytewritten, 7871 data->args.inode->i_ino); 7872 7873 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 7874 task = rpc_run_task(&task_setup_data); 7875 if (IS_ERR(task)) 7876 return PTR_ERR(task); 7877 if (sync == false) 7878 goto out; 7879 status = nfs4_wait_for_completion_rpc_task(task); 7880 if (status != 0) 7881 goto out; 7882 status = task->tk_status; 7883 trace_nfs4_layoutcommit(data->args.inode, status); 7884 out: 7885 dprintk("%s: status %d\n", __func__, status); 7886 rpc_put_task(task); 7887 return status; 7888 } 7889 7890 /** 7891 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 7892 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 7893 */ 7894 static int 7895 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 7896 struct nfs_fsinfo *info, 7897 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 7898 { 7899 struct nfs41_secinfo_no_name_args args = { 7900 .style = SECINFO_STYLE_CURRENT_FH, 7901 }; 7902 struct nfs4_secinfo_res res = { 7903 .flavors = flavors, 7904 }; 7905 struct rpc_message msg = { 7906 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 7907 .rpc_argp = &args, 7908 .rpc_resp = &res, 7909 }; 7910 struct rpc_clnt *clnt = server->client; 7911 struct rpc_cred *cred = NULL; 7912 int status; 7913 7914 if (use_integrity) { 7915 clnt = server->nfs_client->cl_rpcclient; 7916 cred = nfs4_get_clid_cred(server->nfs_client); 7917 msg.rpc_cred = cred; 7918 } 7919 7920 dprintk("--> %s\n", __func__); 7921 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 7922 &res.seq_res, 0); 7923 dprintk("<-- %s status=%d\n", __func__, status); 7924 7925 if (cred) 7926 put_rpccred(cred); 7927 7928 return status; 7929 } 7930 7931 static int 7932 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 7933 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 7934 { 7935 struct nfs4_exception exception = { }; 7936 int err; 7937 do { 7938 /* first try using integrity protection */ 7939 err = -NFS4ERR_WRONGSEC; 7940 7941 /* try to use integrity protection with machine cred */ 7942 if (_nfs4_is_integrity_protected(server->nfs_client)) 7943 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 7944 flavors, true); 7945 7946 /* 7947 * if unable to use integrity protection, or SECINFO with 7948 * integrity protection returns NFS4ERR_WRONGSEC (which is 7949 * disallowed by spec, but exists in deployed servers) use 7950 * the current filesystem's rpc_client and the user cred. 7951 */ 7952 if (err == -NFS4ERR_WRONGSEC) 7953 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 7954 flavors, false); 7955 7956 switch (err) { 7957 case 0: 7958 case -NFS4ERR_WRONGSEC: 7959 case -ENOTSUPP: 7960 goto out; 7961 default: 7962 err = nfs4_handle_exception(server, err, &exception); 7963 } 7964 } while (exception.retry); 7965 out: 7966 return err; 7967 } 7968 7969 static int 7970 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 7971 struct nfs_fsinfo *info) 7972 { 7973 int err; 7974 struct page *page; 7975 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 7976 struct nfs4_secinfo_flavors *flavors; 7977 struct nfs4_secinfo4 *secinfo; 7978 int i; 7979 7980 page = alloc_page(GFP_KERNEL); 7981 if (!page) { 7982 err = -ENOMEM; 7983 goto out; 7984 } 7985 7986 flavors = page_address(page); 7987 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 7988 7989 /* 7990 * Fall back on "guess and check" method if 7991 * the server doesn't support SECINFO_NO_NAME 7992 */ 7993 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 7994 err = nfs4_find_root_sec(server, fhandle, info); 7995 goto out_freepage; 7996 } 7997 if (err) 7998 goto out_freepage; 7999 8000 for (i = 0; i < flavors->num_flavors; i++) { 8001 secinfo = &flavors->flavors[i]; 8002 8003 switch (secinfo->flavor) { 8004 case RPC_AUTH_NULL: 8005 case RPC_AUTH_UNIX: 8006 case RPC_AUTH_GSS: 8007 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 8008 &secinfo->flavor_info); 8009 break; 8010 default: 8011 flavor = RPC_AUTH_MAXFLAVOR; 8012 break; 8013 } 8014 8015 if (!nfs_auth_info_match(&server->auth_info, flavor)) 8016 flavor = RPC_AUTH_MAXFLAVOR; 8017 8018 if (flavor != RPC_AUTH_MAXFLAVOR) { 8019 err = nfs4_lookup_root_sec(server, fhandle, 8020 info, flavor); 8021 if (!err) 8022 break; 8023 } 8024 } 8025 8026 if (flavor == RPC_AUTH_MAXFLAVOR) 8027 err = -EPERM; 8028 8029 out_freepage: 8030 put_page(page); 8031 if (err == -EACCES) 8032 return -EPERM; 8033 out: 8034 return err; 8035 } 8036 8037 static int _nfs41_test_stateid(struct nfs_server *server, 8038 nfs4_stateid *stateid, 8039 struct rpc_cred *cred) 8040 { 8041 int status; 8042 struct nfs41_test_stateid_args args = { 8043 .stateid = stateid, 8044 }; 8045 struct nfs41_test_stateid_res res; 8046 struct rpc_message msg = { 8047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 8048 .rpc_argp = &args, 8049 .rpc_resp = &res, 8050 .rpc_cred = cred, 8051 }; 8052 struct rpc_clnt *rpc_client = server->client; 8053 8054 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8055 &rpc_client, &msg); 8056 8057 dprintk("NFS call test_stateid %p\n", stateid); 8058 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0); 8059 nfs4_set_sequence_privileged(&args.seq_args); 8060 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 8061 &args.seq_args, &res.seq_res); 8062 if (status != NFS_OK) { 8063 dprintk("NFS reply test_stateid: failed, %d\n", status); 8064 return status; 8065 } 8066 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 8067 return -res.status; 8068 } 8069 8070 /** 8071 * nfs41_test_stateid - perform a TEST_STATEID operation 8072 * 8073 * @server: server / transport on which to perform the operation 8074 * @stateid: state ID to test 8075 * @cred: credential 8076 * 8077 * Returns NFS_OK if the server recognizes that "stateid" is valid. 8078 * Otherwise a negative NFS4ERR value is returned if the operation 8079 * failed or the state ID is not currently valid. 8080 */ 8081 static int nfs41_test_stateid(struct nfs_server *server, 8082 nfs4_stateid *stateid, 8083 struct rpc_cred *cred) 8084 { 8085 struct nfs4_exception exception = { }; 8086 int err; 8087 do { 8088 err = _nfs41_test_stateid(server, stateid, cred); 8089 if (err != -NFS4ERR_DELAY) 8090 break; 8091 nfs4_handle_exception(server, err, &exception); 8092 } while (exception.retry); 8093 return err; 8094 } 8095 8096 struct nfs_free_stateid_data { 8097 struct nfs_server *server; 8098 struct nfs41_free_stateid_args args; 8099 struct nfs41_free_stateid_res res; 8100 }; 8101 8102 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 8103 { 8104 struct nfs_free_stateid_data *data = calldata; 8105 nfs41_setup_sequence(nfs4_get_session(data->server), 8106 &data->args.seq_args, 8107 &data->res.seq_res, 8108 task); 8109 } 8110 8111 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 8112 { 8113 struct nfs_free_stateid_data *data = calldata; 8114 8115 nfs41_sequence_done(task, &data->res.seq_res); 8116 8117 switch (task->tk_status) { 8118 case -NFS4ERR_DELAY: 8119 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN) 8120 rpc_restart_call_prepare(task); 8121 } 8122 } 8123 8124 static void nfs41_free_stateid_release(void *calldata) 8125 { 8126 kfree(calldata); 8127 } 8128 8129 static const struct rpc_call_ops nfs41_free_stateid_ops = { 8130 .rpc_call_prepare = nfs41_free_stateid_prepare, 8131 .rpc_call_done = nfs41_free_stateid_done, 8132 .rpc_release = nfs41_free_stateid_release, 8133 }; 8134 8135 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server, 8136 nfs4_stateid *stateid, 8137 struct rpc_cred *cred, 8138 bool privileged) 8139 { 8140 struct rpc_message msg = { 8141 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 8142 .rpc_cred = cred, 8143 }; 8144 struct rpc_task_setup task_setup = { 8145 .rpc_client = server->client, 8146 .rpc_message = &msg, 8147 .callback_ops = &nfs41_free_stateid_ops, 8148 .flags = RPC_TASK_ASYNC, 8149 }; 8150 struct nfs_free_stateid_data *data; 8151 8152 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 8153 &task_setup.rpc_client, &msg); 8154 8155 dprintk("NFS call free_stateid %p\n", stateid); 8156 data = kmalloc(sizeof(*data), GFP_NOFS); 8157 if (!data) 8158 return ERR_PTR(-ENOMEM); 8159 data->server = server; 8160 nfs4_stateid_copy(&data->args.stateid, stateid); 8161 8162 task_setup.callback_data = data; 8163 8164 msg.rpc_argp = &data->args; 8165 msg.rpc_resp = &data->res; 8166 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 8167 if (privileged) 8168 nfs4_set_sequence_privileged(&data->args.seq_args); 8169 8170 return rpc_run_task(&task_setup); 8171 } 8172 8173 /** 8174 * nfs41_free_stateid - perform a FREE_STATEID operation 8175 * 8176 * @server: server / transport on which to perform the operation 8177 * @stateid: state ID to release 8178 * @cred: credential 8179 * 8180 * Returns NFS_OK if the server freed "stateid". Otherwise a 8181 * negative NFS4ERR value is returned. 8182 */ 8183 static int nfs41_free_stateid(struct nfs_server *server, 8184 nfs4_stateid *stateid, 8185 struct rpc_cred *cred) 8186 { 8187 struct rpc_task *task; 8188 int ret; 8189 8190 task = _nfs41_free_stateid(server, stateid, cred, true); 8191 if (IS_ERR(task)) 8192 return PTR_ERR(task); 8193 ret = rpc_wait_for_completion_task(task); 8194 if (!ret) 8195 ret = task->tk_status; 8196 rpc_put_task(task); 8197 return ret; 8198 } 8199 8200 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 8201 { 8202 struct rpc_task *task; 8203 struct rpc_cred *cred = lsp->ls_state->owner->so_cred; 8204 8205 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 8206 nfs4_free_lock_state(server, lsp); 8207 if (IS_ERR(task)) 8208 return PTR_ERR(task); 8209 rpc_put_task(task); 8210 return 0; 8211 } 8212 8213 static bool nfs41_match_stateid(const nfs4_stateid *s1, 8214 const nfs4_stateid *s2) 8215 { 8216 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 8217 return false; 8218 8219 if (s1->seqid == s2->seqid) 8220 return true; 8221 if (s1->seqid == 0 || s2->seqid == 0) 8222 return true; 8223 8224 return false; 8225 } 8226 8227 #endif /* CONFIG_NFS_V4_1 */ 8228 8229 static bool nfs4_match_stateid(const nfs4_stateid *s1, 8230 const nfs4_stateid *s2) 8231 { 8232 return nfs4_stateid_match(s1, s2); 8233 } 8234 8235 8236 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 8237 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8238 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8239 .recover_open = nfs4_open_reclaim, 8240 .recover_lock = nfs4_lock_reclaim, 8241 .establish_clid = nfs4_init_clientid, 8242 .detect_trunking = nfs40_discover_server_trunking, 8243 }; 8244 8245 #if defined(CONFIG_NFS_V4_1) 8246 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 8247 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 8248 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 8249 .recover_open = nfs4_open_reclaim, 8250 .recover_lock = nfs4_lock_reclaim, 8251 .establish_clid = nfs41_init_clientid, 8252 .reclaim_complete = nfs41_proc_reclaim_complete, 8253 .detect_trunking = nfs41_discover_server_trunking, 8254 }; 8255 #endif /* CONFIG_NFS_V4_1 */ 8256 8257 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 8258 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8259 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8260 .recover_open = nfs4_open_expired, 8261 .recover_lock = nfs4_lock_expired, 8262 .establish_clid = nfs4_init_clientid, 8263 }; 8264 8265 #if defined(CONFIG_NFS_V4_1) 8266 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 8267 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 8268 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 8269 .recover_open = nfs41_open_expired, 8270 .recover_lock = nfs41_lock_expired, 8271 .establish_clid = nfs41_init_clientid, 8272 }; 8273 #endif /* CONFIG_NFS_V4_1 */ 8274 8275 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 8276 .sched_state_renewal = nfs4_proc_async_renew, 8277 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 8278 .renew_lease = nfs4_proc_renew, 8279 }; 8280 8281 #if defined(CONFIG_NFS_V4_1) 8282 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 8283 .sched_state_renewal = nfs41_proc_async_sequence, 8284 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 8285 .renew_lease = nfs4_proc_sequence, 8286 }; 8287 #endif 8288 8289 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 8290 .get_locations = _nfs40_proc_get_locations, 8291 .fsid_present = _nfs40_proc_fsid_present, 8292 }; 8293 8294 #if defined(CONFIG_NFS_V4_1) 8295 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 8296 .get_locations = _nfs41_proc_get_locations, 8297 .fsid_present = _nfs41_proc_fsid_present, 8298 }; 8299 #endif /* CONFIG_NFS_V4_1 */ 8300 8301 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 8302 .minor_version = 0, 8303 .init_caps = NFS_CAP_READDIRPLUS 8304 | NFS_CAP_ATOMIC_OPEN 8305 | NFS_CAP_CHANGE_ATTR 8306 | NFS_CAP_POSIX_LOCK, 8307 .init_client = nfs40_init_client, 8308 .shutdown_client = nfs40_shutdown_client, 8309 .match_stateid = nfs4_match_stateid, 8310 .find_root_sec = nfs4_find_root_sec, 8311 .free_lock_state = nfs4_release_lockowner, 8312 .call_sync_ops = &nfs40_call_sync_ops, 8313 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 8314 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 8315 .state_renewal_ops = &nfs40_state_renewal_ops, 8316 .mig_recovery_ops = &nfs40_mig_recovery_ops, 8317 }; 8318 8319 #if defined(CONFIG_NFS_V4_1) 8320 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 8321 .minor_version = 1, 8322 .init_caps = NFS_CAP_READDIRPLUS 8323 | NFS_CAP_ATOMIC_OPEN 8324 | NFS_CAP_CHANGE_ATTR 8325 | NFS_CAP_POSIX_LOCK 8326 | NFS_CAP_STATEID_NFSV41 8327 | NFS_CAP_ATOMIC_OPEN_V1, 8328 .init_client = nfs41_init_client, 8329 .shutdown_client = nfs41_shutdown_client, 8330 .match_stateid = nfs41_match_stateid, 8331 .find_root_sec = nfs41_find_root_sec, 8332 .free_lock_state = nfs41_free_lock_state, 8333 .call_sync_ops = &nfs41_call_sync_ops, 8334 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8335 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8336 .state_renewal_ops = &nfs41_state_renewal_ops, 8337 .mig_recovery_ops = &nfs41_mig_recovery_ops, 8338 }; 8339 #endif 8340 8341 #if defined(CONFIG_NFS_V4_2) 8342 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 8343 .minor_version = 2, 8344 .init_caps = NFS_CAP_READDIRPLUS 8345 | NFS_CAP_ATOMIC_OPEN 8346 | NFS_CAP_CHANGE_ATTR 8347 | NFS_CAP_POSIX_LOCK 8348 | NFS_CAP_STATEID_NFSV41 8349 | NFS_CAP_ATOMIC_OPEN_V1, 8350 .init_client = nfs41_init_client, 8351 .shutdown_client = nfs41_shutdown_client, 8352 .match_stateid = nfs41_match_stateid, 8353 .find_root_sec = nfs41_find_root_sec, 8354 .free_lock_state = nfs41_free_lock_state, 8355 .call_sync_ops = &nfs41_call_sync_ops, 8356 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 8357 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 8358 .state_renewal_ops = &nfs41_state_renewal_ops, 8359 }; 8360 #endif 8361 8362 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 8363 [0] = &nfs_v4_0_minor_ops, 8364 #if defined(CONFIG_NFS_V4_1) 8365 [1] = &nfs_v4_1_minor_ops, 8366 #endif 8367 #if defined(CONFIG_NFS_V4_2) 8368 [2] = &nfs_v4_2_minor_ops, 8369 #endif 8370 }; 8371 8372 static const struct inode_operations nfs4_dir_inode_operations = { 8373 .create = nfs_create, 8374 .lookup = nfs_lookup, 8375 .atomic_open = nfs_atomic_open, 8376 .link = nfs_link, 8377 .unlink = nfs_unlink, 8378 .symlink = nfs_symlink, 8379 .mkdir = nfs_mkdir, 8380 .rmdir = nfs_rmdir, 8381 .mknod = nfs_mknod, 8382 .rename = nfs_rename, 8383 .permission = nfs_permission, 8384 .getattr = nfs_getattr, 8385 .setattr = nfs_setattr, 8386 .getxattr = generic_getxattr, 8387 .setxattr = generic_setxattr, 8388 .listxattr = generic_listxattr, 8389 .removexattr = generic_removexattr, 8390 }; 8391 8392 static const struct inode_operations nfs4_file_inode_operations = { 8393 .permission = nfs_permission, 8394 .getattr = nfs_getattr, 8395 .setattr = nfs_setattr, 8396 .getxattr = generic_getxattr, 8397 .setxattr = generic_setxattr, 8398 .listxattr = generic_listxattr, 8399 .removexattr = generic_removexattr, 8400 }; 8401 8402 const struct nfs_rpc_ops nfs_v4_clientops = { 8403 .version = 4, /* protocol version */ 8404 .dentry_ops = &nfs4_dentry_operations, 8405 .dir_inode_ops = &nfs4_dir_inode_operations, 8406 .file_inode_ops = &nfs4_file_inode_operations, 8407 .file_ops = &nfs4_file_operations, 8408 .getroot = nfs4_proc_get_root, 8409 .submount = nfs4_submount, 8410 .try_mount = nfs4_try_mount, 8411 .getattr = nfs4_proc_getattr, 8412 .setattr = nfs4_proc_setattr, 8413 .lookup = nfs4_proc_lookup, 8414 .access = nfs4_proc_access, 8415 .readlink = nfs4_proc_readlink, 8416 .create = nfs4_proc_create, 8417 .remove = nfs4_proc_remove, 8418 .unlink_setup = nfs4_proc_unlink_setup, 8419 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 8420 .unlink_done = nfs4_proc_unlink_done, 8421 .rename_setup = nfs4_proc_rename_setup, 8422 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 8423 .rename_done = nfs4_proc_rename_done, 8424 .link = nfs4_proc_link, 8425 .symlink = nfs4_proc_symlink, 8426 .mkdir = nfs4_proc_mkdir, 8427 .rmdir = nfs4_proc_remove, 8428 .readdir = nfs4_proc_readdir, 8429 .mknod = nfs4_proc_mknod, 8430 .statfs = nfs4_proc_statfs, 8431 .fsinfo = nfs4_proc_fsinfo, 8432 .pathconf = nfs4_proc_pathconf, 8433 .set_capabilities = nfs4_server_capabilities, 8434 .decode_dirent = nfs4_decode_dirent, 8435 .read_setup = nfs4_proc_read_setup, 8436 .read_pageio_init = pnfs_pageio_init_read, 8437 .read_rpc_prepare = nfs4_proc_read_rpc_prepare, 8438 .read_done = nfs4_read_done, 8439 .write_setup = nfs4_proc_write_setup, 8440 .write_pageio_init = pnfs_pageio_init_write, 8441 .write_rpc_prepare = nfs4_proc_write_rpc_prepare, 8442 .write_done = nfs4_write_done, 8443 .commit_setup = nfs4_proc_commit_setup, 8444 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 8445 .commit_done = nfs4_commit_done, 8446 .lock = nfs4_proc_lock, 8447 .clear_acl_cache = nfs4_zap_acl_attr, 8448 .close_context = nfs4_close_context, 8449 .open_context = nfs4_atomic_open, 8450 .have_delegation = nfs4_have_delegation, 8451 .return_delegation = nfs4_inode_return_delegation, 8452 .alloc_client = nfs4_alloc_client, 8453 .init_client = nfs4_init_client, 8454 .free_client = nfs4_free_client, 8455 .create_server = nfs4_create_server, 8456 .clone_server = nfs_clone_server, 8457 }; 8458 8459 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 8460 .prefix = XATTR_NAME_NFSV4_ACL, 8461 .list = nfs4_xattr_list_nfs4_acl, 8462 .get = nfs4_xattr_get_nfs4_acl, 8463 .set = nfs4_xattr_set_nfs4_acl, 8464 }; 8465 8466 const struct xattr_handler *nfs4_xattr_handlers[] = { 8467 &nfs4_xattr_nfs4_acl_handler, 8468 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 8469 &nfs4_xattr_nfs4_label_handler, 8470 #endif 8471 NULL 8472 }; 8473 8474 /* 8475 * Local variables: 8476 * c-basic-offset: 8 8477 * End: 8478 */ 8479