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 #define NFSDBG_FACILITY NFSDBG_PROC 70 71 #define NFS4_POLL_RETRY_MIN (HZ/10) 72 #define NFS4_POLL_RETRY_MAX (15*HZ) 73 74 struct nfs4_opendata; 75 static int _nfs4_proc_open(struct nfs4_opendata *data); 76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *); 79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *); 81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr); 82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 83 struct nfs_fattr *fattr, struct iattr *sattr, 84 struct nfs4_state *state); 85 #ifdef CONFIG_NFS_V4_1 86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *); 87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *); 88 #endif 89 /* Prevent leaks of NFSv4 errors into userland */ 90 static int nfs4_map_errors(int err) 91 { 92 if (err >= -1000) 93 return err; 94 switch (err) { 95 case -NFS4ERR_RESOURCE: 96 return -EREMOTEIO; 97 case -NFS4ERR_WRONGSEC: 98 return -EPERM; 99 case -NFS4ERR_BADOWNER: 100 case -NFS4ERR_BADNAME: 101 return -EINVAL; 102 case -NFS4ERR_SHARE_DENIED: 103 return -EACCES; 104 case -NFS4ERR_MINOR_VERS_MISMATCH: 105 return -EPROTONOSUPPORT; 106 case -NFS4ERR_ACCESS: 107 return -EACCES; 108 default: 109 dprintk("%s could not handle NFSv4 error %d\n", 110 __func__, -err); 111 break; 112 } 113 return -EIO; 114 } 115 116 /* 117 * This is our standard bitmap for GETATTR requests. 118 */ 119 const u32 nfs4_fattr_bitmap[3] = { 120 FATTR4_WORD0_TYPE 121 | FATTR4_WORD0_CHANGE 122 | FATTR4_WORD0_SIZE 123 | FATTR4_WORD0_FSID 124 | FATTR4_WORD0_FILEID, 125 FATTR4_WORD1_MODE 126 | FATTR4_WORD1_NUMLINKS 127 | FATTR4_WORD1_OWNER 128 | FATTR4_WORD1_OWNER_GROUP 129 | FATTR4_WORD1_RAWDEV 130 | FATTR4_WORD1_SPACE_USED 131 | FATTR4_WORD1_TIME_ACCESS 132 | FATTR4_WORD1_TIME_METADATA 133 | FATTR4_WORD1_TIME_MODIFY 134 }; 135 136 static const u32 nfs4_pnfs_open_bitmap[3] = { 137 FATTR4_WORD0_TYPE 138 | FATTR4_WORD0_CHANGE 139 | FATTR4_WORD0_SIZE 140 | FATTR4_WORD0_FSID 141 | FATTR4_WORD0_FILEID, 142 FATTR4_WORD1_MODE 143 | FATTR4_WORD1_NUMLINKS 144 | FATTR4_WORD1_OWNER 145 | FATTR4_WORD1_OWNER_GROUP 146 | FATTR4_WORD1_RAWDEV 147 | FATTR4_WORD1_SPACE_USED 148 | FATTR4_WORD1_TIME_ACCESS 149 | FATTR4_WORD1_TIME_METADATA 150 | FATTR4_WORD1_TIME_MODIFY, 151 FATTR4_WORD2_MDSTHRESHOLD 152 }; 153 154 static const u32 nfs4_open_noattr_bitmap[3] = { 155 FATTR4_WORD0_TYPE 156 | FATTR4_WORD0_CHANGE 157 | FATTR4_WORD0_FILEID, 158 }; 159 160 const u32 nfs4_statfs_bitmap[2] = { 161 FATTR4_WORD0_FILES_AVAIL 162 | FATTR4_WORD0_FILES_FREE 163 | FATTR4_WORD0_FILES_TOTAL, 164 FATTR4_WORD1_SPACE_AVAIL 165 | FATTR4_WORD1_SPACE_FREE 166 | FATTR4_WORD1_SPACE_TOTAL 167 }; 168 169 const u32 nfs4_pathconf_bitmap[2] = { 170 FATTR4_WORD0_MAXLINK 171 | FATTR4_WORD0_MAXNAME, 172 0 173 }; 174 175 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 176 | FATTR4_WORD0_MAXREAD 177 | FATTR4_WORD0_MAXWRITE 178 | FATTR4_WORD0_LEASE_TIME, 179 FATTR4_WORD1_TIME_DELTA 180 | FATTR4_WORD1_FS_LAYOUT_TYPES, 181 FATTR4_WORD2_LAYOUT_BLKSIZE 182 }; 183 184 const u32 nfs4_fs_locations_bitmap[2] = { 185 FATTR4_WORD0_TYPE 186 | FATTR4_WORD0_CHANGE 187 | FATTR4_WORD0_SIZE 188 | FATTR4_WORD0_FSID 189 | FATTR4_WORD0_FILEID 190 | FATTR4_WORD0_FS_LOCATIONS, 191 FATTR4_WORD1_MODE 192 | FATTR4_WORD1_NUMLINKS 193 | FATTR4_WORD1_OWNER 194 | FATTR4_WORD1_OWNER_GROUP 195 | FATTR4_WORD1_RAWDEV 196 | FATTR4_WORD1_SPACE_USED 197 | FATTR4_WORD1_TIME_ACCESS 198 | FATTR4_WORD1_TIME_METADATA 199 | FATTR4_WORD1_TIME_MODIFY 200 | FATTR4_WORD1_MOUNTED_ON_FILEID 201 }; 202 203 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 204 struct nfs4_readdir_arg *readdir) 205 { 206 __be32 *start, *p; 207 208 if (cookie > 2) { 209 readdir->cookie = cookie; 210 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 211 return; 212 } 213 214 readdir->cookie = 0; 215 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 216 if (cookie == 2) 217 return; 218 219 /* 220 * NFSv4 servers do not return entries for '.' and '..' 221 * Therefore, we fake these entries here. We let '.' 222 * have cookie 0 and '..' have cookie 1. Note that 223 * when talking to the server, we always send cookie 0 224 * instead of 1 or 2. 225 */ 226 start = p = kmap_atomic(*readdir->pages); 227 228 if (cookie == 0) { 229 *p++ = xdr_one; /* next */ 230 *p++ = xdr_zero; /* cookie, first word */ 231 *p++ = xdr_one; /* cookie, second word */ 232 *p++ = xdr_one; /* entry len */ 233 memcpy(p, ".\0\0\0", 4); /* entry */ 234 p++; 235 *p++ = xdr_one; /* bitmap length */ 236 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 237 *p++ = htonl(8); /* attribute buffer length */ 238 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode)); 239 } 240 241 *p++ = xdr_one; /* next */ 242 *p++ = xdr_zero; /* cookie, first word */ 243 *p++ = xdr_two; /* cookie, second word */ 244 *p++ = xdr_two; /* entry len */ 245 memcpy(p, "..\0\0", 4); /* entry */ 246 p++; 247 *p++ = xdr_one; /* bitmap length */ 248 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 249 *p++ = htonl(8); /* attribute buffer length */ 250 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode)); 251 252 readdir->pgbase = (char *)p - (char *)start; 253 readdir->count -= readdir->pgbase; 254 kunmap_atomic(start); 255 } 256 257 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 258 { 259 int res = 0; 260 261 might_sleep(); 262 263 if (*timeout <= 0) 264 *timeout = NFS4_POLL_RETRY_MIN; 265 if (*timeout > NFS4_POLL_RETRY_MAX) 266 *timeout = NFS4_POLL_RETRY_MAX; 267 freezable_schedule_timeout_killable(*timeout); 268 if (fatal_signal_pending(current)) 269 res = -ERESTARTSYS; 270 *timeout <<= 1; 271 return res; 272 } 273 274 /* This is the error handling routine for processes that are allowed 275 * to sleep. 276 */ 277 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 278 { 279 struct nfs_client *clp = server->nfs_client; 280 struct nfs4_state *state = exception->state; 281 struct inode *inode = exception->inode; 282 int ret = errorcode; 283 284 exception->retry = 0; 285 switch(errorcode) { 286 case 0: 287 return 0; 288 case -NFS4ERR_OPENMODE: 289 if (inode && nfs4_have_delegation(inode, FMODE_READ)) { 290 nfs4_inode_return_delegation(inode); 291 exception->retry = 1; 292 return 0; 293 } 294 if (state == NULL) 295 break; 296 nfs4_schedule_stateid_recovery(server, state); 297 goto wait_on_recovery; 298 case -NFS4ERR_DELEG_REVOKED: 299 case -NFS4ERR_ADMIN_REVOKED: 300 case -NFS4ERR_BAD_STATEID: 301 if (state == NULL) 302 break; 303 nfs_remove_bad_delegation(state->inode); 304 nfs4_schedule_stateid_recovery(server, state); 305 goto wait_on_recovery; 306 case -NFS4ERR_EXPIRED: 307 if (state != NULL) 308 nfs4_schedule_stateid_recovery(server, state); 309 case -NFS4ERR_STALE_STATEID: 310 case -NFS4ERR_STALE_CLIENTID: 311 nfs4_schedule_lease_recovery(clp); 312 goto wait_on_recovery; 313 #if defined(CONFIG_NFS_V4_1) 314 case -NFS4ERR_BADSESSION: 315 case -NFS4ERR_BADSLOT: 316 case -NFS4ERR_BAD_HIGH_SLOT: 317 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 318 case -NFS4ERR_DEADSESSION: 319 case -NFS4ERR_SEQ_FALSE_RETRY: 320 case -NFS4ERR_SEQ_MISORDERED: 321 dprintk("%s ERROR: %d Reset session\n", __func__, 322 errorcode); 323 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 324 goto wait_on_recovery; 325 #endif /* defined(CONFIG_NFS_V4_1) */ 326 case -NFS4ERR_FILE_OPEN: 327 if (exception->timeout > HZ) { 328 /* We have retried a decent amount, time to 329 * fail 330 */ 331 ret = -EBUSY; 332 break; 333 } 334 case -NFS4ERR_GRACE: 335 case -NFS4ERR_DELAY: 336 ret = nfs4_delay(server->client, &exception->timeout); 337 if (ret != 0) 338 break; 339 case -NFS4ERR_RETRY_UNCACHED_REP: 340 case -NFS4ERR_OLD_STATEID: 341 exception->retry = 1; 342 break; 343 case -NFS4ERR_BADOWNER: 344 /* The following works around a Linux server bug! */ 345 case -NFS4ERR_BADNAME: 346 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 347 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 348 exception->retry = 1; 349 printk(KERN_WARNING "NFS: v4 server %s " 350 "does not accept raw " 351 "uid/gids. " 352 "Reenabling the idmapper.\n", 353 server->nfs_client->cl_hostname); 354 } 355 } 356 /* We failed to handle the error */ 357 return nfs4_map_errors(ret); 358 wait_on_recovery: 359 ret = nfs4_wait_clnt_recover(clp); 360 if (ret == 0) 361 exception->retry = 1; 362 return ret; 363 } 364 365 366 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 367 { 368 spin_lock(&clp->cl_lock); 369 if (time_before(clp->cl_last_renewal,timestamp)) 370 clp->cl_last_renewal = timestamp; 371 spin_unlock(&clp->cl_lock); 372 } 373 374 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 375 { 376 do_renew_lease(server->nfs_client, timestamp); 377 } 378 379 #if defined(CONFIG_NFS_V4_1) 380 381 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 382 { 383 struct nfs4_session *session; 384 struct nfs4_slot_table *tbl; 385 bool send_new_highest_used_slotid = false; 386 387 if (!res->sr_slot) { 388 /* just wake up the next guy waiting since 389 * we may have not consumed a slot after all */ 390 dprintk("%s: No slot\n", __func__); 391 return; 392 } 393 tbl = res->sr_slot->table; 394 session = tbl->session; 395 396 spin_lock(&tbl->slot_tbl_lock); 397 /* Be nice to the server: try to ensure that the last transmitted 398 * value for highest_user_slotid <= target_highest_slotid 399 */ 400 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 401 send_new_highest_used_slotid = true; 402 403 if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) { 404 send_new_highest_used_slotid = false; 405 goto out_unlock; 406 } 407 nfs4_free_slot(tbl, res->sr_slot); 408 409 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 410 send_new_highest_used_slotid = false; 411 out_unlock: 412 spin_unlock(&tbl->slot_tbl_lock); 413 res->sr_slot = NULL; 414 if (send_new_highest_used_slotid) 415 nfs41_server_notify_highest_slotid_update(session->clp); 416 } 417 418 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 419 { 420 struct nfs4_session *session; 421 struct nfs4_slot *slot; 422 struct nfs_client *clp; 423 bool interrupted = false; 424 int ret = 1; 425 426 /* don't increment the sequence number if the task wasn't sent */ 427 if (!RPC_WAS_SENT(task)) 428 goto out; 429 430 slot = res->sr_slot; 431 session = slot->table->session; 432 433 if (slot->interrupted) { 434 slot->interrupted = 0; 435 interrupted = true; 436 } 437 438 /* Check the SEQUENCE operation status */ 439 switch (res->sr_status) { 440 case 0: 441 /* Update the slot's sequence and clientid lease timer */ 442 ++slot->seq_nr; 443 clp = session->clp; 444 do_renew_lease(clp, res->sr_timestamp); 445 /* Check sequence flags */ 446 if (res->sr_status_flags != 0) 447 nfs4_schedule_lease_recovery(clp); 448 nfs41_update_target_slotid(slot->table, slot, res); 449 break; 450 case 1: 451 /* 452 * sr_status remains 1 if an RPC level error occurred. 453 * The server may or may not have processed the sequence 454 * operation.. 455 * Mark the slot as having hosted an interrupted RPC call. 456 */ 457 slot->interrupted = 1; 458 goto out; 459 case -NFS4ERR_DELAY: 460 /* The server detected a resend of the RPC call and 461 * returned NFS4ERR_DELAY as per Section 2.10.6.2 462 * of RFC5661. 463 */ 464 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 465 __func__, 466 slot->slot_nr, 467 slot->seq_nr); 468 goto out_retry; 469 case -NFS4ERR_BADSLOT: 470 /* 471 * The slot id we used was probably retired. Try again 472 * using a different slot id. 473 */ 474 goto retry_nowait; 475 case -NFS4ERR_SEQ_MISORDERED: 476 /* 477 * Was the last operation on this sequence interrupted? 478 * If so, retry after bumping the sequence number. 479 */ 480 if (interrupted) { 481 ++slot->seq_nr; 482 goto retry_nowait; 483 } 484 /* 485 * Could this slot have been previously retired? 486 * If so, then the server may be expecting seq_nr = 1! 487 */ 488 if (slot->seq_nr != 1) { 489 slot->seq_nr = 1; 490 goto retry_nowait; 491 } 492 break; 493 case -NFS4ERR_SEQ_FALSE_RETRY: 494 ++slot->seq_nr; 495 goto retry_nowait; 496 default: 497 /* Just update the slot sequence no. */ 498 ++slot->seq_nr; 499 } 500 out: 501 /* The session may be reset by one of the error handlers. */ 502 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 503 nfs41_sequence_free_slot(res); 504 return ret; 505 retry_nowait: 506 if (rpc_restart_call_prepare(task)) { 507 task->tk_status = 0; 508 ret = 0; 509 } 510 goto out; 511 out_retry: 512 if (!rpc_restart_call(task)) 513 goto out; 514 rpc_delay(task, NFS4_POLL_RETRY_MAX); 515 return 0; 516 } 517 518 static int nfs4_sequence_done(struct rpc_task *task, 519 struct nfs4_sequence_res *res) 520 { 521 if (res->sr_slot == NULL) 522 return 1; 523 return nfs41_sequence_done(task, res); 524 } 525 526 static void nfs41_init_sequence(struct nfs4_sequence_args *args, 527 struct nfs4_sequence_res *res, int cache_reply) 528 { 529 args->sa_slot = NULL; 530 args->sa_cache_this = 0; 531 args->sa_privileged = 0; 532 if (cache_reply) 533 args->sa_cache_this = 1; 534 res->sr_slot = NULL; 535 } 536 537 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 538 { 539 args->sa_privileged = 1; 540 } 541 542 int nfs41_setup_sequence(struct nfs4_session *session, 543 struct nfs4_sequence_args *args, 544 struct nfs4_sequence_res *res, 545 struct rpc_task *task) 546 { 547 struct nfs4_slot *slot; 548 struct nfs4_slot_table *tbl; 549 550 dprintk("--> %s\n", __func__); 551 /* slot already allocated? */ 552 if (res->sr_slot != NULL) 553 goto out_success; 554 555 tbl = &session->fc_slot_table; 556 557 task->tk_timeout = 0; 558 559 spin_lock(&tbl->slot_tbl_lock); 560 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) && 561 !args->sa_privileged) { 562 /* The state manager will wait until the slot table is empty */ 563 dprintk("%s session is draining\n", __func__); 564 goto out_sleep; 565 } 566 567 slot = nfs4_alloc_slot(tbl); 568 if (IS_ERR(slot)) { 569 /* If out of memory, try again in 1/4 second */ 570 if (slot == ERR_PTR(-ENOMEM)) 571 task->tk_timeout = HZ >> 2; 572 dprintk("<-- %s: no free slots\n", __func__); 573 goto out_sleep; 574 } 575 spin_unlock(&tbl->slot_tbl_lock); 576 577 args->sa_slot = slot; 578 579 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, 580 slot->slot_nr, slot->seq_nr); 581 582 res->sr_slot = slot; 583 res->sr_timestamp = jiffies; 584 res->sr_status_flags = 0; 585 /* 586 * sr_status is only set in decode_sequence, and so will remain 587 * set to 1 if an rpc level failure occurs. 588 */ 589 res->sr_status = 1; 590 out_success: 591 rpc_call_start(task); 592 return 0; 593 out_sleep: 594 /* Privileged tasks are queued with top priority */ 595 if (args->sa_privileged) 596 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 597 NULL, RPC_PRIORITY_PRIVILEGED); 598 else 599 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 600 spin_unlock(&tbl->slot_tbl_lock); 601 return -EAGAIN; 602 } 603 EXPORT_SYMBOL_GPL(nfs41_setup_sequence); 604 605 int nfs4_setup_sequence(const struct nfs_server *server, 606 struct nfs4_sequence_args *args, 607 struct nfs4_sequence_res *res, 608 struct rpc_task *task) 609 { 610 struct nfs4_session *session = nfs4_get_session(server); 611 int ret = 0; 612 613 if (session == NULL) { 614 rpc_call_start(task); 615 goto out; 616 } 617 618 dprintk("--> %s clp %p session %p sr_slot %d\n", 619 __func__, session->clp, session, res->sr_slot ? 620 res->sr_slot->slot_nr : -1); 621 622 ret = nfs41_setup_sequence(session, args, res, task); 623 out: 624 dprintk("<-- %s status=%d\n", __func__, ret); 625 return ret; 626 } 627 628 struct nfs41_call_sync_data { 629 const struct nfs_server *seq_server; 630 struct nfs4_sequence_args *seq_args; 631 struct nfs4_sequence_res *seq_res; 632 }; 633 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 635 { 636 struct nfs41_call_sync_data *data = calldata; 637 struct nfs4_session *session = nfs4_get_session(data->seq_server); 638 639 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 640 641 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task); 642 } 643 644 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 645 { 646 struct nfs41_call_sync_data *data = calldata; 647 648 nfs41_sequence_done(task, data->seq_res); 649 } 650 651 static const struct rpc_call_ops nfs41_call_sync_ops = { 652 .rpc_call_prepare = nfs41_call_sync_prepare, 653 .rpc_call_done = nfs41_call_sync_done, 654 }; 655 656 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 657 struct nfs_server *server, 658 struct rpc_message *msg, 659 struct nfs4_sequence_args *args, 660 struct nfs4_sequence_res *res) 661 { 662 int ret; 663 struct rpc_task *task; 664 struct nfs41_call_sync_data data = { 665 .seq_server = server, 666 .seq_args = args, 667 .seq_res = res, 668 }; 669 struct rpc_task_setup task_setup = { 670 .rpc_client = clnt, 671 .rpc_message = msg, 672 .callback_ops = &nfs41_call_sync_ops, 673 .callback_data = &data 674 }; 675 676 task = rpc_run_task(&task_setup); 677 if (IS_ERR(task)) 678 ret = PTR_ERR(task); 679 else { 680 ret = task->tk_status; 681 rpc_put_task(task); 682 } 683 return ret; 684 } 685 686 #else 687 static 688 void nfs41_init_sequence(struct nfs4_sequence_args *args, 689 struct nfs4_sequence_res *res, int cache_reply) 690 { 691 } 692 693 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 694 { 695 } 696 697 698 static int nfs4_sequence_done(struct rpc_task *task, 699 struct nfs4_sequence_res *res) 700 { 701 return 1; 702 } 703 #endif /* CONFIG_NFS_V4_1 */ 704 705 static 706 int _nfs4_call_sync(struct rpc_clnt *clnt, 707 struct nfs_server *server, 708 struct rpc_message *msg, 709 struct nfs4_sequence_args *args, 710 struct nfs4_sequence_res *res) 711 { 712 return rpc_call_sync(clnt, msg, 0); 713 } 714 715 static 716 int nfs4_call_sync(struct rpc_clnt *clnt, 717 struct nfs_server *server, 718 struct rpc_message *msg, 719 struct nfs4_sequence_args *args, 720 struct nfs4_sequence_res *res, 721 int cache_reply) 722 { 723 nfs41_init_sequence(args, res, cache_reply); 724 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg, 725 args, res); 726 } 727 728 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 729 { 730 struct nfs_inode *nfsi = NFS_I(dir); 731 732 spin_lock(&dir->i_lock); 733 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 734 if (!cinfo->atomic || cinfo->before != dir->i_version) 735 nfs_force_lookup_revalidate(dir); 736 dir->i_version = cinfo->after; 737 nfs_fscache_invalidate(dir); 738 spin_unlock(&dir->i_lock); 739 } 740 741 struct nfs4_opendata { 742 struct kref kref; 743 struct nfs_openargs o_arg; 744 struct nfs_openres o_res; 745 struct nfs_open_confirmargs c_arg; 746 struct nfs_open_confirmres c_res; 747 struct nfs4_string owner_name; 748 struct nfs4_string group_name; 749 struct nfs_fattr f_attr; 750 struct dentry *dir; 751 struct dentry *dentry; 752 struct nfs4_state_owner *owner; 753 struct nfs4_state *state; 754 struct iattr attrs; 755 unsigned long timestamp; 756 unsigned int rpc_done : 1; 757 int rpc_status; 758 int cancelled; 759 }; 760 761 762 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 763 { 764 p->o_res.f_attr = &p->f_attr; 765 p->o_res.seqid = p->o_arg.seqid; 766 p->c_res.seqid = p->c_arg.seqid; 767 p->o_res.server = p->o_arg.server; 768 p->o_res.access_request = p->o_arg.access; 769 nfs_fattr_init(&p->f_attr); 770 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 771 } 772 773 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 774 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 775 const struct iattr *attrs, 776 gfp_t gfp_mask) 777 { 778 struct dentry *parent = dget_parent(dentry); 779 struct inode *dir = parent->d_inode; 780 struct nfs_server *server = NFS_SERVER(dir); 781 struct nfs4_opendata *p; 782 783 p = kzalloc(sizeof(*p), gfp_mask); 784 if (p == NULL) 785 goto err; 786 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask); 787 if (p->o_arg.seqid == NULL) 788 goto err_free; 789 nfs_sb_active(dentry->d_sb); 790 p->dentry = dget(dentry); 791 p->dir = parent; 792 p->owner = sp; 793 atomic_inc(&sp->so_count); 794 p->o_arg.fh = NFS_FH(dir); 795 p->o_arg.open_flags = flags; 796 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 797 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 798 * will return permission denied for all bits until close */ 799 if (!(flags & O_EXCL)) { 800 /* ask server to check for all possible rights as results 801 * are cached */ 802 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 803 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE; 804 } 805 p->o_arg.clientid = server->nfs_client->cl_clientid; 806 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 807 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 808 p->o_arg.name = &dentry->d_name; 809 p->o_arg.server = server; 810 p->o_arg.bitmask = server->attr_bitmask; 811 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 812 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL; 813 if (attrs != NULL && attrs->ia_valid != 0) { 814 __be32 verf[2]; 815 816 p->o_arg.u.attrs = &p->attrs; 817 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 818 819 verf[0] = jiffies; 820 verf[1] = current->pid; 821 memcpy(p->o_arg.u.verifier.data, verf, 822 sizeof(p->o_arg.u.verifier.data)); 823 } 824 p->c_arg.fh = &p->o_res.fh; 825 p->c_arg.stateid = &p->o_res.stateid; 826 p->c_arg.seqid = p->o_arg.seqid; 827 nfs4_init_opendata_res(p); 828 kref_init(&p->kref); 829 return p; 830 err_free: 831 kfree(p); 832 err: 833 dput(parent); 834 return NULL; 835 } 836 837 static void nfs4_opendata_free(struct kref *kref) 838 { 839 struct nfs4_opendata *p = container_of(kref, 840 struct nfs4_opendata, kref); 841 struct super_block *sb = p->dentry->d_sb; 842 843 nfs_free_seqid(p->o_arg.seqid); 844 if (p->state != NULL) 845 nfs4_put_open_state(p->state); 846 nfs4_put_state_owner(p->owner); 847 dput(p->dir); 848 dput(p->dentry); 849 nfs_sb_deactive(sb); 850 nfs_fattr_free_names(&p->f_attr); 851 kfree(p); 852 } 853 854 static void nfs4_opendata_put(struct nfs4_opendata *p) 855 { 856 if (p != NULL) 857 kref_put(&p->kref, nfs4_opendata_free); 858 } 859 860 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 861 { 862 int ret; 863 864 ret = rpc_wait_for_completion_task(task); 865 return ret; 866 } 867 868 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 869 { 870 int ret = 0; 871 872 if (open_mode & (O_EXCL|O_TRUNC)) 873 goto out; 874 switch (mode & (FMODE_READ|FMODE_WRITE)) { 875 case FMODE_READ: 876 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 877 && state->n_rdonly != 0; 878 break; 879 case FMODE_WRITE: 880 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 881 && state->n_wronly != 0; 882 break; 883 case FMODE_READ|FMODE_WRITE: 884 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 885 && state->n_rdwr != 0; 886 } 887 out: 888 return ret; 889 } 890 891 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode) 892 { 893 if (delegation == NULL) 894 return 0; 895 if ((delegation->type & fmode) != fmode) 896 return 0; 897 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 898 return 0; 899 nfs_mark_delegation_referenced(delegation); 900 return 1; 901 } 902 903 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 904 { 905 switch (fmode) { 906 case FMODE_WRITE: 907 state->n_wronly++; 908 break; 909 case FMODE_READ: 910 state->n_rdonly++; 911 break; 912 case FMODE_READ|FMODE_WRITE: 913 state->n_rdwr++; 914 } 915 nfs4_state_set_mode_locked(state, state->state | fmode); 916 } 917 918 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 919 { 920 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 921 nfs4_stateid_copy(&state->stateid, stateid); 922 nfs4_stateid_copy(&state->open_stateid, stateid); 923 switch (fmode) { 924 case FMODE_READ: 925 set_bit(NFS_O_RDONLY_STATE, &state->flags); 926 break; 927 case FMODE_WRITE: 928 set_bit(NFS_O_WRONLY_STATE, &state->flags); 929 break; 930 case FMODE_READ|FMODE_WRITE: 931 set_bit(NFS_O_RDWR_STATE, &state->flags); 932 } 933 } 934 935 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 936 { 937 write_seqlock(&state->seqlock); 938 nfs_set_open_stateid_locked(state, stateid, fmode); 939 write_sequnlock(&state->seqlock); 940 } 941 942 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode) 943 { 944 /* 945 * Protect the call to nfs4_state_set_mode_locked and 946 * serialise the stateid update 947 */ 948 write_seqlock(&state->seqlock); 949 if (deleg_stateid != NULL) { 950 nfs4_stateid_copy(&state->stateid, deleg_stateid); 951 set_bit(NFS_DELEGATED_STATE, &state->flags); 952 } 953 if (open_stateid != NULL) 954 nfs_set_open_stateid_locked(state, open_stateid, fmode); 955 write_sequnlock(&state->seqlock); 956 spin_lock(&state->owner->so_lock); 957 update_open_stateflags(state, fmode); 958 spin_unlock(&state->owner->so_lock); 959 } 960 961 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode) 962 { 963 struct nfs_inode *nfsi = NFS_I(state->inode); 964 struct nfs_delegation *deleg_cur; 965 int ret = 0; 966 967 fmode &= (FMODE_READ|FMODE_WRITE); 968 969 rcu_read_lock(); 970 deleg_cur = rcu_dereference(nfsi->delegation); 971 if (deleg_cur == NULL) 972 goto no_delegation; 973 974 spin_lock(&deleg_cur->lock); 975 if (nfsi->delegation != deleg_cur || 976 (deleg_cur->type & fmode) != fmode) 977 goto no_delegation_unlock; 978 979 if (delegation == NULL) 980 delegation = &deleg_cur->stateid; 981 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 982 goto no_delegation_unlock; 983 984 nfs_mark_delegation_referenced(deleg_cur); 985 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode); 986 ret = 1; 987 no_delegation_unlock: 988 spin_unlock(&deleg_cur->lock); 989 no_delegation: 990 rcu_read_unlock(); 991 992 if (!ret && open_stateid != NULL) { 993 __update_open_stateid(state, open_stateid, NULL, fmode); 994 ret = 1; 995 } 996 997 return ret; 998 } 999 1000 1001 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1002 { 1003 struct nfs_delegation *delegation; 1004 1005 rcu_read_lock(); 1006 delegation = rcu_dereference(NFS_I(inode)->delegation); 1007 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1008 rcu_read_unlock(); 1009 return; 1010 } 1011 rcu_read_unlock(); 1012 nfs4_inode_return_delegation(inode); 1013 } 1014 1015 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1016 { 1017 struct nfs4_state *state = opendata->state; 1018 struct nfs_inode *nfsi = NFS_I(state->inode); 1019 struct nfs_delegation *delegation; 1020 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC); 1021 fmode_t fmode = opendata->o_arg.fmode; 1022 nfs4_stateid stateid; 1023 int ret = -EAGAIN; 1024 1025 for (;;) { 1026 if (can_open_cached(state, fmode, open_mode)) { 1027 spin_lock(&state->owner->so_lock); 1028 if (can_open_cached(state, fmode, open_mode)) { 1029 update_open_stateflags(state, fmode); 1030 spin_unlock(&state->owner->so_lock); 1031 goto out_return_state; 1032 } 1033 spin_unlock(&state->owner->so_lock); 1034 } 1035 rcu_read_lock(); 1036 delegation = rcu_dereference(nfsi->delegation); 1037 if (!can_open_delegated(delegation, fmode)) { 1038 rcu_read_unlock(); 1039 break; 1040 } 1041 /* Save the delegation */ 1042 nfs4_stateid_copy(&stateid, &delegation->stateid); 1043 rcu_read_unlock(); 1044 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1045 if (ret != 0) 1046 goto out; 1047 ret = -EAGAIN; 1048 1049 /* Try to update the stateid using the delegation */ 1050 if (update_open_stateid(state, NULL, &stateid, fmode)) 1051 goto out_return_state; 1052 } 1053 out: 1054 return ERR_PTR(ret); 1055 out_return_state: 1056 atomic_inc(&state->count); 1057 return state; 1058 } 1059 1060 static void 1061 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1062 { 1063 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1064 struct nfs_delegation *delegation; 1065 int delegation_flags = 0; 1066 1067 rcu_read_lock(); 1068 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1069 if (delegation) 1070 delegation_flags = delegation->flags; 1071 rcu_read_unlock(); 1072 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) { 1073 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1074 "returning a delegation for " 1075 "OPEN(CLAIM_DELEGATE_CUR)\n", 1076 clp->cl_hostname); 1077 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1078 nfs_inode_set_delegation(state->inode, 1079 data->owner->so_cred, 1080 &data->o_res); 1081 else 1082 nfs_inode_reclaim_delegation(state->inode, 1083 data->owner->so_cred, 1084 &data->o_res); 1085 } 1086 1087 /* 1088 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1089 * and update the nfs4_state. 1090 */ 1091 static struct nfs4_state * 1092 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1093 { 1094 struct inode *inode = data->state->inode; 1095 struct nfs4_state *state = data->state; 1096 int ret; 1097 1098 if (!data->rpc_done) { 1099 ret = data->rpc_status; 1100 goto err; 1101 } 1102 1103 ret = -ESTALE; 1104 if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) || 1105 !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) || 1106 !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE)) 1107 goto err; 1108 1109 ret = -ENOMEM; 1110 state = nfs4_get_open_state(inode, data->owner); 1111 if (state == NULL) 1112 goto err; 1113 1114 ret = nfs_refresh_inode(inode, &data->f_attr); 1115 if (ret) 1116 goto err; 1117 1118 if (data->o_res.delegation_type != 0) 1119 nfs4_opendata_check_deleg(data, state); 1120 update_open_stateid(state, &data->o_res.stateid, NULL, 1121 data->o_arg.fmode); 1122 1123 return state; 1124 err: 1125 return ERR_PTR(ret); 1126 1127 } 1128 1129 static struct nfs4_state * 1130 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1131 { 1132 struct inode *inode; 1133 struct nfs4_state *state = NULL; 1134 int ret; 1135 1136 if (!data->rpc_done) { 1137 state = nfs4_try_open_cached(data); 1138 goto out; 1139 } 1140 1141 ret = -EAGAIN; 1142 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1143 goto err; 1144 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr); 1145 ret = PTR_ERR(inode); 1146 if (IS_ERR(inode)) 1147 goto err; 1148 ret = -ENOMEM; 1149 state = nfs4_get_open_state(inode, data->owner); 1150 if (state == NULL) 1151 goto err_put_inode; 1152 if (data->o_res.delegation_type != 0) 1153 nfs4_opendata_check_deleg(data, state); 1154 update_open_stateid(state, &data->o_res.stateid, NULL, 1155 data->o_arg.fmode); 1156 iput(inode); 1157 out: 1158 return state; 1159 err_put_inode: 1160 iput(inode); 1161 err: 1162 return ERR_PTR(ret); 1163 } 1164 1165 static struct nfs4_state * 1166 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1167 { 1168 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1169 return _nfs4_opendata_reclaim_to_nfs4_state(data); 1170 return _nfs4_opendata_to_nfs4_state(data); 1171 } 1172 1173 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1174 { 1175 struct nfs_inode *nfsi = NFS_I(state->inode); 1176 struct nfs_open_context *ctx; 1177 1178 spin_lock(&state->inode->i_lock); 1179 list_for_each_entry(ctx, &nfsi->open_files, list) { 1180 if (ctx->state != state) 1181 continue; 1182 get_nfs_open_context(ctx); 1183 spin_unlock(&state->inode->i_lock); 1184 return ctx; 1185 } 1186 spin_unlock(&state->inode->i_lock); 1187 return ERR_PTR(-ENOENT); 1188 } 1189 1190 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state) 1191 { 1192 struct nfs4_opendata *opendata; 1193 1194 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS); 1195 if (opendata == NULL) 1196 return ERR_PTR(-ENOMEM); 1197 opendata->state = state; 1198 atomic_inc(&state->count); 1199 return opendata; 1200 } 1201 1202 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res) 1203 { 1204 struct nfs4_state *newstate; 1205 int ret; 1206 1207 opendata->o_arg.open_flags = 0; 1208 opendata->o_arg.fmode = fmode; 1209 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1210 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1211 nfs4_init_opendata_res(opendata); 1212 ret = _nfs4_recover_proc_open(opendata); 1213 if (ret != 0) 1214 return ret; 1215 newstate = nfs4_opendata_to_nfs4_state(opendata); 1216 if (IS_ERR(newstate)) 1217 return PTR_ERR(newstate); 1218 nfs4_close_state(newstate, fmode); 1219 *res = newstate; 1220 return 0; 1221 } 1222 1223 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1224 { 1225 struct nfs4_state *newstate; 1226 int ret; 1227 1228 /* memory barrier prior to reading state->n_* */ 1229 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1230 smp_rmb(); 1231 if (state->n_rdwr != 0) { 1232 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1233 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate); 1234 if (ret != 0) 1235 return ret; 1236 if (newstate != state) 1237 return -ESTALE; 1238 } 1239 if (state->n_wronly != 0) { 1240 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1241 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate); 1242 if (ret != 0) 1243 return ret; 1244 if (newstate != state) 1245 return -ESTALE; 1246 } 1247 if (state->n_rdonly != 0) { 1248 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1249 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate); 1250 if (ret != 0) 1251 return ret; 1252 if (newstate != state) 1253 return -ESTALE; 1254 } 1255 /* 1256 * We may have performed cached opens for all three recoveries. 1257 * Check if we need to update the current stateid. 1258 */ 1259 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1260 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1261 write_seqlock(&state->seqlock); 1262 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1263 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1264 write_sequnlock(&state->seqlock); 1265 } 1266 return 0; 1267 } 1268 1269 /* 1270 * OPEN_RECLAIM: 1271 * reclaim state on the server after a reboot. 1272 */ 1273 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1274 { 1275 struct nfs_delegation *delegation; 1276 struct nfs4_opendata *opendata; 1277 fmode_t delegation_type = 0; 1278 int status; 1279 1280 opendata = nfs4_open_recoverdata_alloc(ctx, state); 1281 if (IS_ERR(opendata)) 1282 return PTR_ERR(opendata); 1283 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS; 1284 opendata->o_arg.fh = NFS_FH(state->inode); 1285 rcu_read_lock(); 1286 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1287 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1288 delegation_type = delegation->type; 1289 rcu_read_unlock(); 1290 opendata->o_arg.u.delegation_type = delegation_type; 1291 status = nfs4_open_recover(opendata, state); 1292 nfs4_opendata_put(opendata); 1293 return status; 1294 } 1295 1296 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1297 { 1298 struct nfs_server *server = NFS_SERVER(state->inode); 1299 struct nfs4_exception exception = { }; 1300 int err; 1301 do { 1302 err = _nfs4_do_open_reclaim(ctx, state); 1303 if (err != -NFS4ERR_DELAY) 1304 break; 1305 nfs4_handle_exception(server, err, &exception); 1306 } while (exception.retry); 1307 return err; 1308 } 1309 1310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 1311 { 1312 struct nfs_open_context *ctx; 1313 int ret; 1314 1315 ctx = nfs4_state_find_open_context(state); 1316 if (IS_ERR(ctx)) 1317 return PTR_ERR(ctx); 1318 ret = nfs4_do_open_reclaim(ctx, state); 1319 put_nfs_open_context(ctx); 1320 return ret; 1321 } 1322 1323 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 1324 { 1325 struct nfs4_opendata *opendata; 1326 int ret; 1327 1328 opendata = nfs4_open_recoverdata_alloc(ctx, state); 1329 if (IS_ERR(opendata)) 1330 return PTR_ERR(opendata); 1331 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR; 1332 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 1333 ret = nfs4_open_recover(opendata, state); 1334 nfs4_opendata_put(opendata); 1335 return ret; 1336 } 1337 1338 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 1339 { 1340 struct nfs4_exception exception = { }; 1341 struct nfs_server *server = NFS_SERVER(state->inode); 1342 int err; 1343 do { 1344 err = _nfs4_open_delegation_recall(ctx, state, stateid); 1345 switch (err) { 1346 case 0: 1347 case -ENOENT: 1348 case -ESTALE: 1349 goto out; 1350 case -NFS4ERR_BADSESSION: 1351 case -NFS4ERR_BADSLOT: 1352 case -NFS4ERR_BAD_HIGH_SLOT: 1353 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1354 case -NFS4ERR_DEADSESSION: 1355 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 1356 goto out; 1357 case -NFS4ERR_STALE_CLIENTID: 1358 case -NFS4ERR_STALE_STATEID: 1359 case -NFS4ERR_EXPIRED: 1360 /* Don't recall a delegation if it was lost */ 1361 nfs4_schedule_lease_recovery(server->nfs_client); 1362 goto out; 1363 case -ERESTARTSYS: 1364 /* 1365 * The show must go on: exit, but mark the 1366 * stateid as needing recovery. 1367 */ 1368 case -NFS4ERR_DELEG_REVOKED: 1369 case -NFS4ERR_ADMIN_REVOKED: 1370 case -NFS4ERR_BAD_STATEID: 1371 nfs_inode_find_state_and_recover(state->inode, 1372 stateid); 1373 nfs4_schedule_stateid_recovery(server, state); 1374 case -ENOMEM: 1375 err = 0; 1376 goto out; 1377 } 1378 err = nfs4_handle_exception(server, err, &exception); 1379 } while (exception.retry); 1380 out: 1381 return err; 1382 } 1383 1384 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 1385 { 1386 struct nfs4_opendata *data = calldata; 1387 1388 data->rpc_status = task->tk_status; 1389 if (data->rpc_status == 0) { 1390 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 1391 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1392 renew_lease(data->o_res.server, data->timestamp); 1393 data->rpc_done = 1; 1394 } 1395 } 1396 1397 static void nfs4_open_confirm_release(void *calldata) 1398 { 1399 struct nfs4_opendata *data = calldata; 1400 struct nfs4_state *state = NULL; 1401 1402 /* If this request hasn't been cancelled, do nothing */ 1403 if (data->cancelled == 0) 1404 goto out_free; 1405 /* In case of error, no cleanup! */ 1406 if (!data->rpc_done) 1407 goto out_free; 1408 state = nfs4_opendata_to_nfs4_state(data); 1409 if (!IS_ERR(state)) 1410 nfs4_close_state(state, data->o_arg.fmode); 1411 out_free: 1412 nfs4_opendata_put(data); 1413 } 1414 1415 static const struct rpc_call_ops nfs4_open_confirm_ops = { 1416 .rpc_call_done = nfs4_open_confirm_done, 1417 .rpc_release = nfs4_open_confirm_release, 1418 }; 1419 1420 /* 1421 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 1422 */ 1423 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 1424 { 1425 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 1426 struct rpc_task *task; 1427 struct rpc_message msg = { 1428 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 1429 .rpc_argp = &data->c_arg, 1430 .rpc_resp = &data->c_res, 1431 .rpc_cred = data->owner->so_cred, 1432 }; 1433 struct rpc_task_setup task_setup_data = { 1434 .rpc_client = server->client, 1435 .rpc_message = &msg, 1436 .callback_ops = &nfs4_open_confirm_ops, 1437 .callback_data = data, 1438 .workqueue = nfsiod_workqueue, 1439 .flags = RPC_TASK_ASYNC, 1440 }; 1441 int status; 1442 1443 kref_get(&data->kref); 1444 data->rpc_done = 0; 1445 data->rpc_status = 0; 1446 data->timestamp = jiffies; 1447 task = rpc_run_task(&task_setup_data); 1448 if (IS_ERR(task)) 1449 return PTR_ERR(task); 1450 status = nfs4_wait_for_completion_rpc_task(task); 1451 if (status != 0) { 1452 data->cancelled = 1; 1453 smp_wmb(); 1454 } else 1455 status = data->rpc_status; 1456 rpc_put_task(task); 1457 return status; 1458 } 1459 1460 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 1461 { 1462 struct nfs4_opendata *data = calldata; 1463 struct nfs4_state_owner *sp = data->owner; 1464 1465 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 1466 return; 1467 /* 1468 * Check if we still need to send an OPEN call, or if we can use 1469 * a delegation instead. 1470 */ 1471 if (data->state != NULL) { 1472 struct nfs_delegation *delegation; 1473 1474 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 1475 goto out_no_action; 1476 rcu_read_lock(); 1477 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 1478 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR && 1479 can_open_delegated(delegation, data->o_arg.fmode)) 1480 goto unlock_no_action; 1481 rcu_read_unlock(); 1482 } 1483 /* Update client id. */ 1484 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid; 1485 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) { 1486 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 1487 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 1488 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 1489 } 1490 data->timestamp = jiffies; 1491 if (nfs4_setup_sequence(data->o_arg.server, 1492 &data->o_arg.seq_args, 1493 &data->o_res.seq_res, 1494 task) != 0) 1495 nfs_release_seqid(data->o_arg.seqid); 1496 return; 1497 unlock_no_action: 1498 rcu_read_unlock(); 1499 out_no_action: 1500 task->tk_action = NULL; 1501 nfs4_sequence_done(task, &data->o_res.seq_res); 1502 } 1503 1504 static void nfs4_open_done(struct rpc_task *task, void *calldata) 1505 { 1506 struct nfs4_opendata *data = calldata; 1507 1508 data->rpc_status = task->tk_status; 1509 1510 if (!nfs4_sequence_done(task, &data->o_res.seq_res)) 1511 return; 1512 1513 if (task->tk_status == 0) { 1514 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 1515 switch (data->o_res.f_attr->mode & S_IFMT) { 1516 case S_IFREG: 1517 break; 1518 case S_IFLNK: 1519 data->rpc_status = -ELOOP; 1520 break; 1521 case S_IFDIR: 1522 data->rpc_status = -EISDIR; 1523 break; 1524 default: 1525 data->rpc_status = -ENOTDIR; 1526 } 1527 } 1528 renew_lease(data->o_res.server, data->timestamp); 1529 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 1530 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1531 } 1532 data->rpc_done = 1; 1533 } 1534 1535 static void nfs4_open_release(void *calldata) 1536 { 1537 struct nfs4_opendata *data = calldata; 1538 struct nfs4_state *state = NULL; 1539 1540 /* If this request hasn't been cancelled, do nothing */ 1541 if (data->cancelled == 0) 1542 goto out_free; 1543 /* In case of error, no cleanup! */ 1544 if (data->rpc_status != 0 || !data->rpc_done) 1545 goto out_free; 1546 /* In case we need an open_confirm, no cleanup! */ 1547 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 1548 goto out_free; 1549 state = nfs4_opendata_to_nfs4_state(data); 1550 if (!IS_ERR(state)) 1551 nfs4_close_state(state, data->o_arg.fmode); 1552 out_free: 1553 nfs4_opendata_put(data); 1554 } 1555 1556 static const struct rpc_call_ops nfs4_open_ops = { 1557 .rpc_call_prepare = nfs4_open_prepare, 1558 .rpc_call_done = nfs4_open_done, 1559 .rpc_release = nfs4_open_release, 1560 }; 1561 1562 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 1563 { 1564 struct inode *dir = data->dir->d_inode; 1565 struct nfs_server *server = NFS_SERVER(dir); 1566 struct nfs_openargs *o_arg = &data->o_arg; 1567 struct nfs_openres *o_res = &data->o_res; 1568 struct rpc_task *task; 1569 struct rpc_message msg = { 1570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 1571 .rpc_argp = o_arg, 1572 .rpc_resp = o_res, 1573 .rpc_cred = data->owner->so_cred, 1574 }; 1575 struct rpc_task_setup task_setup_data = { 1576 .rpc_client = server->client, 1577 .rpc_message = &msg, 1578 .callback_ops = &nfs4_open_ops, 1579 .callback_data = data, 1580 .workqueue = nfsiod_workqueue, 1581 .flags = RPC_TASK_ASYNC, 1582 }; 1583 int status; 1584 1585 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 1586 kref_get(&data->kref); 1587 data->rpc_done = 0; 1588 data->rpc_status = 0; 1589 data->cancelled = 0; 1590 if (isrecover) 1591 nfs4_set_sequence_privileged(&o_arg->seq_args); 1592 task = rpc_run_task(&task_setup_data); 1593 if (IS_ERR(task)) 1594 return PTR_ERR(task); 1595 status = nfs4_wait_for_completion_rpc_task(task); 1596 if (status != 0) { 1597 data->cancelled = 1; 1598 smp_wmb(); 1599 } else 1600 status = data->rpc_status; 1601 rpc_put_task(task); 1602 1603 return status; 1604 } 1605 1606 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 1607 { 1608 struct inode *dir = data->dir->d_inode; 1609 struct nfs_openres *o_res = &data->o_res; 1610 int status; 1611 1612 status = nfs4_run_open_task(data, 1); 1613 if (status != 0 || !data->rpc_done) 1614 return status; 1615 1616 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 1617 1618 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 1619 status = _nfs4_proc_open_confirm(data); 1620 if (status != 0) 1621 return status; 1622 } 1623 1624 return status; 1625 } 1626 1627 static int nfs4_opendata_access(struct rpc_cred *cred, 1628 struct nfs4_opendata *opendata, 1629 struct nfs4_state *state, fmode_t fmode, 1630 int openflags) 1631 { 1632 struct nfs_access_entry cache; 1633 u32 mask; 1634 1635 /* access call failed or for some reason the server doesn't 1636 * support any access modes -- defer access call until later */ 1637 if (opendata->o_res.access_supported == 0) 1638 return 0; 1639 1640 mask = 0; 1641 /* don't check MAY_WRITE - a newly created file may not have 1642 * write mode bits, but POSIX allows the creating process to write. 1643 * use openflags to check for exec, because fmode won't 1644 * always have FMODE_EXEC set when file open for exec. */ 1645 if (openflags & __FMODE_EXEC) { 1646 /* ONLY check for exec rights */ 1647 mask = MAY_EXEC; 1648 } else if (fmode & FMODE_READ) 1649 mask = MAY_READ; 1650 1651 cache.cred = cred; 1652 cache.jiffies = jiffies; 1653 nfs_access_set_mask(&cache, opendata->o_res.access_result); 1654 nfs_access_add_cache(state->inode, &cache); 1655 1656 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 1657 return 0; 1658 1659 /* even though OPEN succeeded, access is denied. Close the file */ 1660 nfs4_close_state(state, fmode); 1661 return -EACCES; 1662 } 1663 1664 /* 1665 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 1666 */ 1667 static int _nfs4_proc_open(struct nfs4_opendata *data) 1668 { 1669 struct inode *dir = data->dir->d_inode; 1670 struct nfs_server *server = NFS_SERVER(dir); 1671 struct nfs_openargs *o_arg = &data->o_arg; 1672 struct nfs_openres *o_res = &data->o_res; 1673 int status; 1674 1675 status = nfs4_run_open_task(data, 0); 1676 if (!data->rpc_done) 1677 return status; 1678 if (status != 0) { 1679 if (status == -NFS4ERR_BADNAME && 1680 !(o_arg->open_flags & O_CREAT)) 1681 return -ENOENT; 1682 return status; 1683 } 1684 1685 nfs_fattr_map_and_free_names(server, &data->f_attr); 1686 1687 if (o_arg->open_flags & O_CREAT) 1688 update_changeattr(dir, &o_res->cinfo); 1689 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 1690 server->caps &= ~NFS_CAP_POSIX_LOCK; 1691 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 1692 status = _nfs4_proc_open_confirm(data); 1693 if (status != 0) 1694 return status; 1695 } 1696 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 1697 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr); 1698 return 0; 1699 } 1700 1701 static int nfs4_recover_expired_lease(struct nfs_server *server) 1702 { 1703 return nfs4_client_recover_expired_lease(server->nfs_client); 1704 } 1705 1706 /* 1707 * OPEN_EXPIRED: 1708 * reclaim state on the server after a network partition. 1709 * Assumes caller holds the appropriate lock 1710 */ 1711 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 1712 { 1713 struct nfs4_opendata *opendata; 1714 int ret; 1715 1716 opendata = nfs4_open_recoverdata_alloc(ctx, state); 1717 if (IS_ERR(opendata)) 1718 return PTR_ERR(opendata); 1719 ret = nfs4_open_recover(opendata, state); 1720 if (ret == -ESTALE) 1721 d_drop(ctx->dentry); 1722 nfs4_opendata_put(opendata); 1723 return ret; 1724 } 1725 1726 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 1727 { 1728 struct nfs_server *server = NFS_SERVER(state->inode); 1729 struct nfs4_exception exception = { }; 1730 int err; 1731 1732 do { 1733 err = _nfs4_open_expired(ctx, state); 1734 switch (err) { 1735 default: 1736 goto out; 1737 case -NFS4ERR_GRACE: 1738 case -NFS4ERR_DELAY: 1739 nfs4_handle_exception(server, err, &exception); 1740 err = 0; 1741 } 1742 } while (exception.retry); 1743 out: 1744 return err; 1745 } 1746 1747 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 1748 { 1749 struct nfs_open_context *ctx; 1750 int ret; 1751 1752 ctx = nfs4_state_find_open_context(state); 1753 if (IS_ERR(ctx)) 1754 return PTR_ERR(ctx); 1755 ret = nfs4_do_open_expired(ctx, state); 1756 put_nfs_open_context(ctx); 1757 return ret; 1758 } 1759 1760 #if defined(CONFIG_NFS_V4_1) 1761 static void nfs41_clear_delegation_stateid(struct nfs4_state *state) 1762 { 1763 struct nfs_server *server = NFS_SERVER(state->inode); 1764 nfs4_stateid *stateid = &state->stateid; 1765 int status; 1766 1767 /* If a state reset has been done, test_stateid is unneeded */ 1768 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1769 return; 1770 1771 status = nfs41_test_stateid(server, stateid); 1772 if (status != NFS_OK) { 1773 /* Free the stateid unless the server explicitly 1774 * informs us the stateid is unrecognized. */ 1775 if (status != -NFS4ERR_BAD_STATEID) 1776 nfs41_free_stateid(server, stateid); 1777 nfs_remove_bad_delegation(state->inode); 1778 1779 write_seqlock(&state->seqlock); 1780 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1781 write_sequnlock(&state->seqlock); 1782 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1783 } 1784 } 1785 1786 /** 1787 * nfs41_check_open_stateid - possibly free an open stateid 1788 * 1789 * @state: NFSv4 state for an inode 1790 * 1791 * Returns NFS_OK if recovery for this stateid is now finished. 1792 * Otherwise a negative NFS4ERR value is returned. 1793 */ 1794 static int nfs41_check_open_stateid(struct nfs4_state *state) 1795 { 1796 struct nfs_server *server = NFS_SERVER(state->inode); 1797 nfs4_stateid *stateid = &state->open_stateid; 1798 int status; 1799 1800 /* If a state reset has been done, test_stateid is unneeded */ 1801 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 1802 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 1803 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 1804 return -NFS4ERR_BAD_STATEID; 1805 1806 status = nfs41_test_stateid(server, stateid); 1807 if (status != NFS_OK) { 1808 /* Free the stateid unless the server explicitly 1809 * informs us the stateid is unrecognized. */ 1810 if (status != -NFS4ERR_BAD_STATEID) 1811 nfs41_free_stateid(server, stateid); 1812 1813 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1814 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1815 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1816 } 1817 return status; 1818 } 1819 1820 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 1821 { 1822 int status; 1823 1824 nfs41_clear_delegation_stateid(state); 1825 status = nfs41_check_open_stateid(state); 1826 if (status != NFS_OK) 1827 status = nfs4_open_expired(sp, state); 1828 return status; 1829 } 1830 #endif 1831 1832 /* 1833 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 1834 * fields corresponding to attributes that were used to store the verifier. 1835 * Make sure we clobber those fields in the later setattr call 1836 */ 1837 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 1838 { 1839 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 1840 !(sattr->ia_valid & ATTR_ATIME_SET)) 1841 sattr->ia_valid |= ATTR_ATIME; 1842 1843 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 1844 !(sattr->ia_valid & ATTR_MTIME_SET)) 1845 sattr->ia_valid |= ATTR_MTIME; 1846 } 1847 1848 /* 1849 * Returns a referenced nfs4_state 1850 */ 1851 static int _nfs4_do_open(struct inode *dir, 1852 struct dentry *dentry, 1853 fmode_t fmode, 1854 int flags, 1855 struct iattr *sattr, 1856 struct rpc_cred *cred, 1857 struct nfs4_state **res, 1858 struct nfs4_threshold **ctx_th) 1859 { 1860 struct nfs4_state_owner *sp; 1861 struct nfs4_state *state = NULL; 1862 struct nfs_server *server = NFS_SERVER(dir); 1863 struct nfs4_opendata *opendata; 1864 int status; 1865 1866 /* Protect against reboot recovery conflicts */ 1867 status = -ENOMEM; 1868 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 1869 if (sp == NULL) { 1870 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 1871 goto out_err; 1872 } 1873 status = nfs4_recover_expired_lease(server); 1874 if (status != 0) 1875 goto err_put_state_owner; 1876 if (dentry->d_inode != NULL) 1877 nfs4_return_incompatible_delegation(dentry->d_inode, fmode); 1878 status = -ENOMEM; 1879 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL); 1880 if (opendata == NULL) 1881 goto err_put_state_owner; 1882 1883 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 1884 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 1885 if (!opendata->f_attr.mdsthreshold) 1886 goto err_opendata_put; 1887 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 1888 } 1889 if (dentry->d_inode != NULL) 1890 opendata->state = nfs4_get_open_state(dentry->d_inode, sp); 1891 1892 status = _nfs4_proc_open(opendata); 1893 if (status != 0) 1894 goto err_opendata_put; 1895 1896 state = nfs4_opendata_to_nfs4_state(opendata); 1897 status = PTR_ERR(state); 1898 if (IS_ERR(state)) 1899 goto err_opendata_put; 1900 if (server->caps & NFS_CAP_POSIX_LOCK) 1901 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 1902 1903 status = nfs4_opendata_access(cred, opendata, state, fmode, flags); 1904 if (status != 0) 1905 goto err_opendata_put; 1906 1907 if (opendata->o_arg.open_flags & O_EXCL) { 1908 nfs4_exclusive_attrset(opendata, sattr); 1909 1910 nfs_fattr_init(opendata->o_res.f_attr); 1911 status = nfs4_do_setattr(state->inode, cred, 1912 opendata->o_res.f_attr, sattr, 1913 state); 1914 if (status == 0) 1915 nfs_setattr_update_inode(state->inode, sattr); 1916 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr); 1917 } 1918 1919 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) 1920 *ctx_th = opendata->f_attr.mdsthreshold; 1921 else 1922 kfree(opendata->f_attr.mdsthreshold); 1923 opendata->f_attr.mdsthreshold = NULL; 1924 1925 nfs4_opendata_put(opendata); 1926 nfs4_put_state_owner(sp); 1927 *res = state; 1928 return 0; 1929 err_opendata_put: 1930 kfree(opendata->f_attr.mdsthreshold); 1931 nfs4_opendata_put(opendata); 1932 err_put_state_owner: 1933 nfs4_put_state_owner(sp); 1934 out_err: 1935 *res = NULL; 1936 return status; 1937 } 1938 1939 1940 static struct nfs4_state *nfs4_do_open(struct inode *dir, 1941 struct dentry *dentry, 1942 fmode_t fmode, 1943 int flags, 1944 struct iattr *sattr, 1945 struct rpc_cred *cred, 1946 struct nfs4_threshold **ctx_th) 1947 { 1948 struct nfs4_exception exception = { }; 1949 struct nfs4_state *res; 1950 int status; 1951 1952 fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC; 1953 do { 1954 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, 1955 &res, ctx_th); 1956 if (status == 0) 1957 break; 1958 /* NOTE: BAD_SEQID means the server and client disagree about the 1959 * book-keeping w.r.t. state-changing operations 1960 * (OPEN/CLOSE/LOCK/LOCKU...) 1961 * It is actually a sign of a bug on the client or on the server. 1962 * 1963 * If we receive a BAD_SEQID error in the particular case of 1964 * doing an OPEN, we assume that nfs_increment_open_seqid() will 1965 * have unhashed the old state_owner for us, and that we can 1966 * therefore safely retry using a new one. We should still warn 1967 * the user though... 1968 */ 1969 if (status == -NFS4ERR_BAD_SEQID) { 1970 pr_warn_ratelimited("NFS: v4 server %s " 1971 " returned a bad sequence-id error!\n", 1972 NFS_SERVER(dir)->nfs_client->cl_hostname); 1973 exception.retry = 1; 1974 continue; 1975 } 1976 /* 1977 * BAD_STATEID on OPEN means that the server cancelled our 1978 * state before it received the OPEN_CONFIRM. 1979 * Recover by retrying the request as per the discussion 1980 * on Page 181 of RFC3530. 1981 */ 1982 if (status == -NFS4ERR_BAD_STATEID) { 1983 exception.retry = 1; 1984 continue; 1985 } 1986 if (status == -EAGAIN) { 1987 /* We must have found a delegation */ 1988 exception.retry = 1; 1989 continue; 1990 } 1991 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), 1992 status, &exception)); 1993 } while (exception.retry); 1994 return res; 1995 } 1996 1997 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 1998 struct nfs_fattr *fattr, struct iattr *sattr, 1999 struct nfs4_state *state) 2000 { 2001 struct nfs_server *server = NFS_SERVER(inode); 2002 struct nfs_setattrargs arg = { 2003 .fh = NFS_FH(inode), 2004 .iap = sattr, 2005 .server = server, 2006 .bitmask = server->attr_bitmask, 2007 }; 2008 struct nfs_setattrres res = { 2009 .fattr = fattr, 2010 .server = server, 2011 }; 2012 struct rpc_message msg = { 2013 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2014 .rpc_argp = &arg, 2015 .rpc_resp = &res, 2016 .rpc_cred = cred, 2017 }; 2018 unsigned long timestamp = jiffies; 2019 int status; 2020 2021 nfs_fattr_init(fattr); 2022 2023 if (state != NULL) { 2024 struct nfs_lockowner lockowner = { 2025 .l_owner = current->files, 2026 .l_pid = current->tgid, 2027 }; 2028 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE, 2029 &lockowner); 2030 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode, 2031 FMODE_WRITE)) { 2032 /* Use that stateid */ 2033 } else 2034 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 2035 2036 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 2037 if (status == 0 && state != NULL) 2038 renew_lease(server, timestamp); 2039 return status; 2040 } 2041 2042 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2043 struct nfs_fattr *fattr, struct iattr *sattr, 2044 struct nfs4_state *state) 2045 { 2046 struct nfs_server *server = NFS_SERVER(inode); 2047 struct nfs4_exception exception = { 2048 .state = state, 2049 .inode = inode, 2050 }; 2051 int err; 2052 do { 2053 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state); 2054 switch (err) { 2055 case -NFS4ERR_OPENMODE: 2056 if (state && !(state->state & FMODE_WRITE)) { 2057 err = -EBADF; 2058 if (sattr->ia_valid & ATTR_OPEN) 2059 err = -EACCES; 2060 goto out; 2061 } 2062 } 2063 err = nfs4_handle_exception(server, err, &exception); 2064 } while (exception.retry); 2065 out: 2066 return err; 2067 } 2068 2069 struct nfs4_closedata { 2070 struct inode *inode; 2071 struct nfs4_state *state; 2072 struct nfs_closeargs arg; 2073 struct nfs_closeres res; 2074 struct nfs_fattr fattr; 2075 unsigned long timestamp; 2076 bool roc; 2077 u32 roc_barrier; 2078 }; 2079 2080 static void nfs4_free_closedata(void *data) 2081 { 2082 struct nfs4_closedata *calldata = data; 2083 struct nfs4_state_owner *sp = calldata->state->owner; 2084 struct super_block *sb = calldata->state->inode->i_sb; 2085 2086 if (calldata->roc) 2087 pnfs_roc_release(calldata->state->inode); 2088 nfs4_put_open_state(calldata->state); 2089 nfs_free_seqid(calldata->arg.seqid); 2090 nfs4_put_state_owner(sp); 2091 nfs_sb_deactive_async(sb); 2092 kfree(calldata); 2093 } 2094 2095 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state, 2096 fmode_t fmode) 2097 { 2098 spin_lock(&state->owner->so_lock); 2099 if (!(fmode & FMODE_READ)) 2100 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2101 if (!(fmode & FMODE_WRITE)) 2102 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2103 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2104 spin_unlock(&state->owner->so_lock); 2105 } 2106 2107 static void nfs4_close_done(struct rpc_task *task, void *data) 2108 { 2109 struct nfs4_closedata *calldata = data; 2110 struct nfs4_state *state = calldata->state; 2111 struct nfs_server *server = NFS_SERVER(calldata->inode); 2112 2113 dprintk("%s: begin!\n", __func__); 2114 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2115 return; 2116 /* hmm. we are done with the inode, and in the process of freeing 2117 * the state_owner. we keep this around to process errors 2118 */ 2119 switch (task->tk_status) { 2120 case 0: 2121 if (calldata->roc) 2122 pnfs_roc_set_barrier(state->inode, 2123 calldata->roc_barrier); 2124 nfs_set_open_stateid(state, &calldata->res.stateid, 0); 2125 renew_lease(server, calldata->timestamp); 2126 nfs4_close_clear_stateid_flags(state, 2127 calldata->arg.fmode); 2128 break; 2129 case -NFS4ERR_STALE_STATEID: 2130 case -NFS4ERR_OLD_STATEID: 2131 case -NFS4ERR_BAD_STATEID: 2132 case -NFS4ERR_EXPIRED: 2133 if (calldata->arg.fmode == 0) 2134 break; 2135 default: 2136 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) 2137 rpc_restart_call_prepare(task); 2138 } 2139 nfs_release_seqid(calldata->arg.seqid); 2140 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2141 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2142 } 2143 2144 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2145 { 2146 struct nfs4_closedata *calldata = data; 2147 struct nfs4_state *state = calldata->state; 2148 struct inode *inode = calldata->inode; 2149 int call_close = 0; 2150 2151 dprintk("%s: begin!\n", __func__); 2152 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2153 return; 2154 2155 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2156 calldata->arg.fmode = FMODE_READ|FMODE_WRITE; 2157 spin_lock(&state->owner->so_lock); 2158 /* Calculate the change in open mode */ 2159 if (state->n_rdwr == 0) { 2160 if (state->n_rdonly == 0) { 2161 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); 2162 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2163 calldata->arg.fmode &= ~FMODE_READ; 2164 } 2165 if (state->n_wronly == 0) { 2166 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); 2167 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2168 calldata->arg.fmode &= ~FMODE_WRITE; 2169 } 2170 } 2171 spin_unlock(&state->owner->so_lock); 2172 2173 if (!call_close) { 2174 /* Note: exit _without_ calling nfs4_close_done */ 2175 task->tk_action = NULL; 2176 nfs4_sequence_done(task, &calldata->res.seq_res); 2177 goto out; 2178 } 2179 2180 if (calldata->arg.fmode == 0) { 2181 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2182 if (calldata->roc && 2183 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) 2184 goto out; 2185 } 2186 2187 nfs_fattr_init(calldata->res.fattr); 2188 calldata->timestamp = jiffies; 2189 if (nfs4_setup_sequence(NFS_SERVER(inode), 2190 &calldata->arg.seq_args, 2191 &calldata->res.seq_res, 2192 task) != 0) 2193 nfs_release_seqid(calldata->arg.seqid); 2194 out: 2195 dprintk("%s: done!\n", __func__); 2196 } 2197 2198 static const struct rpc_call_ops nfs4_close_ops = { 2199 .rpc_call_prepare = nfs4_close_prepare, 2200 .rpc_call_done = nfs4_close_done, 2201 .rpc_release = nfs4_free_closedata, 2202 }; 2203 2204 /* 2205 * It is possible for data to be read/written from a mem-mapped file 2206 * after the sys_close call (which hits the vfs layer as a flush). 2207 * This means that we can't safely call nfsv4 close on a file until 2208 * the inode is cleared. This in turn means that we are not good 2209 * NFSv4 citizens - we do not indicate to the server to update the file's 2210 * share state even when we are done with one of the three share 2211 * stateid's in the inode. 2212 * 2213 * NOTE: Caller must be holding the sp->so_owner semaphore! 2214 */ 2215 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2216 { 2217 struct nfs_server *server = NFS_SERVER(state->inode); 2218 struct nfs4_closedata *calldata; 2219 struct nfs4_state_owner *sp = state->owner; 2220 struct rpc_task *task; 2221 struct rpc_message msg = { 2222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2223 .rpc_cred = state->owner->so_cred, 2224 }; 2225 struct rpc_task_setup task_setup_data = { 2226 .rpc_client = server->client, 2227 .rpc_message = &msg, 2228 .callback_ops = &nfs4_close_ops, 2229 .workqueue = nfsiod_workqueue, 2230 .flags = RPC_TASK_ASYNC, 2231 }; 2232 int status = -ENOMEM; 2233 2234 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2235 if (calldata == NULL) 2236 goto out; 2237 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2238 calldata->inode = state->inode; 2239 calldata->state = state; 2240 calldata->arg.fh = NFS_FH(state->inode); 2241 calldata->arg.stateid = &state->open_stateid; 2242 /* Serialization for the sequence id */ 2243 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask); 2244 if (calldata->arg.seqid == NULL) 2245 goto out_free_calldata; 2246 calldata->arg.fmode = 0; 2247 calldata->arg.bitmask = server->cache_consistency_bitmask; 2248 calldata->res.fattr = &calldata->fattr; 2249 calldata->res.seqid = calldata->arg.seqid; 2250 calldata->res.server = server; 2251 calldata->roc = pnfs_roc(state->inode); 2252 nfs_sb_active(calldata->inode->i_sb); 2253 2254 msg.rpc_argp = &calldata->arg; 2255 msg.rpc_resp = &calldata->res; 2256 task_setup_data.callback_data = calldata; 2257 task = rpc_run_task(&task_setup_data); 2258 if (IS_ERR(task)) 2259 return PTR_ERR(task); 2260 status = 0; 2261 if (wait) 2262 status = rpc_wait_for_completion_task(task); 2263 rpc_put_task(task); 2264 return status; 2265 out_free_calldata: 2266 kfree(calldata); 2267 out: 2268 nfs4_put_open_state(state); 2269 nfs4_put_state_owner(sp); 2270 return status; 2271 } 2272 2273 static struct inode * 2274 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr) 2275 { 2276 struct nfs4_state *state; 2277 2278 /* Protect against concurrent sillydeletes */ 2279 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, 2280 ctx->cred, &ctx->mdsthreshold); 2281 if (IS_ERR(state)) 2282 return ERR_CAST(state); 2283 ctx->state = state; 2284 return igrab(state->inode); 2285 } 2286 2287 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 2288 { 2289 if (ctx->state == NULL) 2290 return; 2291 if (is_sync) 2292 nfs4_close_sync(ctx->state, ctx->mode); 2293 else 2294 nfs4_close_state(ctx->state, ctx->mode); 2295 } 2296 2297 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2298 { 2299 struct nfs4_server_caps_arg args = { 2300 .fhandle = fhandle, 2301 }; 2302 struct nfs4_server_caps_res res = {}; 2303 struct rpc_message msg = { 2304 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 2305 .rpc_argp = &args, 2306 .rpc_resp = &res, 2307 }; 2308 int status; 2309 2310 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2311 if (status == 0) { 2312 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 2313 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 2314 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 2315 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 2316 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 2317 NFS_CAP_CTIME|NFS_CAP_MTIME); 2318 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) 2319 server->caps |= NFS_CAP_ACLS; 2320 if (res.has_links != 0) 2321 server->caps |= NFS_CAP_HARDLINKS; 2322 if (res.has_symlinks != 0) 2323 server->caps |= NFS_CAP_SYMLINKS; 2324 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 2325 server->caps |= NFS_CAP_FILEID; 2326 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 2327 server->caps |= NFS_CAP_MODE; 2328 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 2329 server->caps |= NFS_CAP_NLINK; 2330 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 2331 server->caps |= NFS_CAP_OWNER; 2332 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 2333 server->caps |= NFS_CAP_OWNER_GROUP; 2334 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 2335 server->caps |= NFS_CAP_ATIME; 2336 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 2337 server->caps |= NFS_CAP_CTIME; 2338 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 2339 server->caps |= NFS_CAP_MTIME; 2340 2341 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 2342 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 2343 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 2344 server->acl_bitmask = res.acl_bitmask; 2345 server->fh_expire_type = res.fh_expire_type; 2346 } 2347 2348 return status; 2349 } 2350 2351 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2352 { 2353 struct nfs4_exception exception = { }; 2354 int err; 2355 do { 2356 err = nfs4_handle_exception(server, 2357 _nfs4_server_capabilities(server, fhandle), 2358 &exception); 2359 } while (exception.retry); 2360 return err; 2361 } 2362 2363 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2364 struct nfs_fsinfo *info) 2365 { 2366 struct nfs4_lookup_root_arg args = { 2367 .bitmask = nfs4_fattr_bitmap, 2368 }; 2369 struct nfs4_lookup_res res = { 2370 .server = server, 2371 .fattr = info->fattr, 2372 .fh = fhandle, 2373 }; 2374 struct rpc_message msg = { 2375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 2376 .rpc_argp = &args, 2377 .rpc_resp = &res, 2378 }; 2379 2380 nfs_fattr_init(info->fattr); 2381 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2382 } 2383 2384 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2385 struct nfs_fsinfo *info) 2386 { 2387 struct nfs4_exception exception = { }; 2388 int err; 2389 do { 2390 err = _nfs4_lookup_root(server, fhandle, info); 2391 switch (err) { 2392 case 0: 2393 case -NFS4ERR_WRONGSEC: 2394 goto out; 2395 default: 2396 err = nfs4_handle_exception(server, err, &exception); 2397 } 2398 } while (exception.retry); 2399 out: 2400 return err; 2401 } 2402 2403 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2404 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 2405 { 2406 struct rpc_auth *auth; 2407 int ret; 2408 2409 auth = rpcauth_create(flavor, server->client); 2410 if (IS_ERR(auth)) { 2411 ret = -EIO; 2412 goto out; 2413 } 2414 ret = nfs4_lookup_root(server, fhandle, info); 2415 out: 2416 return ret; 2417 } 2418 2419 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2420 struct nfs_fsinfo *info) 2421 { 2422 int i, len, status = 0; 2423 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS]; 2424 2425 len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array)); 2426 if (len < 0) 2427 return len; 2428 2429 for (i = 0; i < len; i++) { 2430 /* AUTH_UNIX is the default flavor if none was specified, 2431 * thus has already been tried. */ 2432 if (flav_array[i] == RPC_AUTH_UNIX) 2433 continue; 2434 2435 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]); 2436 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 2437 continue; 2438 break; 2439 } 2440 /* 2441 * -EACCESS could mean that the user doesn't have correct permissions 2442 * to access the mount. It could also mean that we tried to mount 2443 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 2444 * existing mount programs don't handle -EACCES very well so it should 2445 * be mapped to -EPERM instead. 2446 */ 2447 if (status == -EACCES) 2448 status = -EPERM; 2449 return status; 2450 } 2451 2452 /* 2453 * get the file handle for the "/" directory on the server 2454 */ 2455 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 2456 struct nfs_fsinfo *info) 2457 { 2458 int minor_version = server->nfs_client->cl_minorversion; 2459 int status = nfs4_lookup_root(server, fhandle, info); 2460 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR)) 2461 /* 2462 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM 2463 * by nfs4_map_errors() as this function exits. 2464 */ 2465 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info); 2466 if (status == 0) 2467 status = nfs4_server_capabilities(server, fhandle); 2468 if (status == 0) 2469 status = nfs4_do_fsinfo(server, fhandle, info); 2470 return nfs4_map_errors(status); 2471 } 2472 2473 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 2474 struct nfs_fsinfo *info) 2475 { 2476 int error; 2477 struct nfs_fattr *fattr = info->fattr; 2478 2479 error = nfs4_server_capabilities(server, mntfh); 2480 if (error < 0) { 2481 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 2482 return error; 2483 } 2484 2485 error = nfs4_proc_getattr(server, mntfh, fattr); 2486 if (error < 0) { 2487 dprintk("nfs4_get_root: getattr error = %d\n", -error); 2488 return error; 2489 } 2490 2491 if (fattr->valid & NFS_ATTR_FATTR_FSID && 2492 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 2493 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 2494 2495 return error; 2496 } 2497 2498 /* 2499 * Get locations and (maybe) other attributes of a referral. 2500 * Note that we'll actually follow the referral later when 2501 * we detect fsid mismatch in inode revalidation 2502 */ 2503 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 2504 const struct qstr *name, struct nfs_fattr *fattr, 2505 struct nfs_fh *fhandle) 2506 { 2507 int status = -ENOMEM; 2508 struct page *page = NULL; 2509 struct nfs4_fs_locations *locations = NULL; 2510 2511 page = alloc_page(GFP_KERNEL); 2512 if (page == NULL) 2513 goto out; 2514 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 2515 if (locations == NULL) 2516 goto out; 2517 2518 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 2519 if (status != 0) 2520 goto out; 2521 /* Make sure server returned a different fsid for the referral */ 2522 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 2523 dprintk("%s: server did not return a different fsid for" 2524 " a referral at %s\n", __func__, name->name); 2525 status = -EIO; 2526 goto out; 2527 } 2528 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 2529 nfs_fixup_referral_attributes(&locations->fattr); 2530 2531 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 2532 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 2533 memset(fhandle, 0, sizeof(struct nfs_fh)); 2534 out: 2535 if (page) 2536 __free_page(page); 2537 kfree(locations); 2538 return status; 2539 } 2540 2541 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2542 { 2543 struct nfs4_getattr_arg args = { 2544 .fh = fhandle, 2545 .bitmask = server->attr_bitmask, 2546 }; 2547 struct nfs4_getattr_res res = { 2548 .fattr = fattr, 2549 .server = server, 2550 }; 2551 struct rpc_message msg = { 2552 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 2553 .rpc_argp = &args, 2554 .rpc_resp = &res, 2555 }; 2556 2557 nfs_fattr_init(fattr); 2558 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2559 } 2560 2561 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2562 { 2563 struct nfs4_exception exception = { }; 2564 int err; 2565 do { 2566 err = nfs4_handle_exception(server, 2567 _nfs4_proc_getattr(server, fhandle, fattr), 2568 &exception); 2569 } while (exception.retry); 2570 return err; 2571 } 2572 2573 /* 2574 * The file is not closed if it is opened due to the a request to change 2575 * the size of the file. The open call will not be needed once the 2576 * VFS layer lookup-intents are implemented. 2577 * 2578 * Close is called when the inode is destroyed. 2579 * If we haven't opened the file for O_WRONLY, we 2580 * need to in the size_change case to obtain a stateid. 2581 * 2582 * Got race? 2583 * Because OPEN is always done by name in nfsv4, it is 2584 * possible that we opened a different file by the same 2585 * name. We can recognize this race condition, but we 2586 * can't do anything about it besides returning an error. 2587 * 2588 * This will be fixed with VFS changes (lookup-intent). 2589 */ 2590 static int 2591 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 2592 struct iattr *sattr) 2593 { 2594 struct inode *inode = dentry->d_inode; 2595 struct rpc_cred *cred = NULL; 2596 struct nfs4_state *state = NULL; 2597 int status; 2598 2599 if (pnfs_ld_layoutret_on_setattr(inode)) 2600 pnfs_return_layout(inode); 2601 2602 nfs_fattr_init(fattr); 2603 2604 /* Deal with open(O_TRUNC) */ 2605 if (sattr->ia_valid & ATTR_OPEN) 2606 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN); 2607 2608 /* Optimization: if the end result is no change, don't RPC */ 2609 if ((sattr->ia_valid & ~(ATTR_FILE)) == 0) 2610 return 0; 2611 2612 /* Search for an existing open(O_WRITE) file */ 2613 if (sattr->ia_valid & ATTR_FILE) { 2614 struct nfs_open_context *ctx; 2615 2616 ctx = nfs_file_open_context(sattr->ia_file); 2617 if (ctx) { 2618 cred = ctx->cred; 2619 state = ctx->state; 2620 } 2621 } 2622 2623 status = nfs4_do_setattr(inode, cred, fattr, sattr, state); 2624 if (status == 0) 2625 nfs_setattr_update_inode(inode, sattr); 2626 return status; 2627 } 2628 2629 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 2630 const struct qstr *name, struct nfs_fh *fhandle, 2631 struct nfs_fattr *fattr) 2632 { 2633 struct nfs_server *server = NFS_SERVER(dir); 2634 int status; 2635 struct nfs4_lookup_arg args = { 2636 .bitmask = server->attr_bitmask, 2637 .dir_fh = NFS_FH(dir), 2638 .name = name, 2639 }; 2640 struct nfs4_lookup_res res = { 2641 .server = server, 2642 .fattr = fattr, 2643 .fh = fhandle, 2644 }; 2645 struct rpc_message msg = { 2646 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 2647 .rpc_argp = &args, 2648 .rpc_resp = &res, 2649 }; 2650 2651 nfs_fattr_init(fattr); 2652 2653 dprintk("NFS call lookup %s\n", name->name); 2654 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 2655 dprintk("NFS reply lookup: %d\n", status); 2656 return status; 2657 } 2658 2659 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 2660 { 2661 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 2662 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 2663 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 2664 fattr->nlink = 2; 2665 } 2666 2667 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 2668 struct qstr *name, struct nfs_fh *fhandle, 2669 struct nfs_fattr *fattr) 2670 { 2671 struct nfs4_exception exception = { }; 2672 struct rpc_clnt *client = *clnt; 2673 int err; 2674 do { 2675 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr); 2676 switch (err) { 2677 case -NFS4ERR_BADNAME: 2678 err = -ENOENT; 2679 goto out; 2680 case -NFS4ERR_MOVED: 2681 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 2682 goto out; 2683 case -NFS4ERR_WRONGSEC: 2684 err = -EPERM; 2685 if (client != *clnt) 2686 goto out; 2687 2688 client = nfs4_create_sec_client(client, dir, name); 2689 if (IS_ERR(client)) 2690 return PTR_ERR(client); 2691 2692 exception.retry = 1; 2693 break; 2694 default: 2695 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 2696 } 2697 } while (exception.retry); 2698 2699 out: 2700 if (err == 0) 2701 *clnt = client; 2702 else if (client != *clnt) 2703 rpc_shutdown_client(client); 2704 2705 return err; 2706 } 2707 2708 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, 2709 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2710 { 2711 int status; 2712 struct rpc_clnt *client = NFS_CLIENT(dir); 2713 2714 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr); 2715 if (client != NFS_CLIENT(dir)) { 2716 rpc_shutdown_client(client); 2717 nfs_fixup_secinfo_attributes(fattr); 2718 } 2719 return status; 2720 } 2721 2722 struct rpc_clnt * 2723 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name, 2724 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2725 { 2726 int status; 2727 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir)); 2728 2729 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr); 2730 if (status < 0) { 2731 rpc_shutdown_client(client); 2732 return ERR_PTR(status); 2733 } 2734 return client; 2735 } 2736 2737 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 2738 { 2739 struct nfs_server *server = NFS_SERVER(inode); 2740 struct nfs4_accessargs args = { 2741 .fh = NFS_FH(inode), 2742 .bitmask = server->cache_consistency_bitmask, 2743 }; 2744 struct nfs4_accessres res = { 2745 .server = server, 2746 }; 2747 struct rpc_message msg = { 2748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 2749 .rpc_argp = &args, 2750 .rpc_resp = &res, 2751 .rpc_cred = entry->cred, 2752 }; 2753 int mode = entry->mask; 2754 int status; 2755 2756 /* 2757 * Determine which access bits we want to ask for... 2758 */ 2759 if (mode & MAY_READ) 2760 args.access |= NFS4_ACCESS_READ; 2761 if (S_ISDIR(inode->i_mode)) { 2762 if (mode & MAY_WRITE) 2763 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 2764 if (mode & MAY_EXEC) 2765 args.access |= NFS4_ACCESS_LOOKUP; 2766 } else { 2767 if (mode & MAY_WRITE) 2768 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 2769 if (mode & MAY_EXEC) 2770 args.access |= NFS4_ACCESS_EXECUTE; 2771 } 2772 2773 res.fattr = nfs_alloc_fattr(); 2774 if (res.fattr == NULL) 2775 return -ENOMEM; 2776 2777 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2778 if (!status) { 2779 nfs_access_set_mask(entry, res.access); 2780 nfs_refresh_inode(inode, res.fattr); 2781 } 2782 nfs_free_fattr(res.fattr); 2783 return status; 2784 } 2785 2786 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 2787 { 2788 struct nfs4_exception exception = { }; 2789 int err; 2790 do { 2791 err = nfs4_handle_exception(NFS_SERVER(inode), 2792 _nfs4_proc_access(inode, entry), 2793 &exception); 2794 } while (exception.retry); 2795 return err; 2796 } 2797 2798 /* 2799 * TODO: For the time being, we don't try to get any attributes 2800 * along with any of the zero-copy operations READ, READDIR, 2801 * READLINK, WRITE. 2802 * 2803 * In the case of the first three, we want to put the GETATTR 2804 * after the read-type operation -- this is because it is hard 2805 * to predict the length of a GETATTR response in v4, and thus 2806 * align the READ data correctly. This means that the GETATTR 2807 * may end up partially falling into the page cache, and we should 2808 * shift it into the 'tail' of the xdr_buf before processing. 2809 * To do this efficiently, we need to know the total length 2810 * of data received, which doesn't seem to be available outside 2811 * of the RPC layer. 2812 * 2813 * In the case of WRITE, we also want to put the GETATTR after 2814 * the operation -- in this case because we want to make sure 2815 * we get the post-operation mtime and size. 2816 * 2817 * Both of these changes to the XDR layer would in fact be quite 2818 * minor, but I decided to leave them for a subsequent patch. 2819 */ 2820 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 2821 unsigned int pgbase, unsigned int pglen) 2822 { 2823 struct nfs4_readlink args = { 2824 .fh = NFS_FH(inode), 2825 .pgbase = pgbase, 2826 .pglen = pglen, 2827 .pages = &page, 2828 }; 2829 struct nfs4_readlink_res res; 2830 struct rpc_message msg = { 2831 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 2832 .rpc_argp = &args, 2833 .rpc_resp = &res, 2834 }; 2835 2836 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 2837 } 2838 2839 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 2840 unsigned int pgbase, unsigned int pglen) 2841 { 2842 struct nfs4_exception exception = { }; 2843 int err; 2844 do { 2845 err = nfs4_handle_exception(NFS_SERVER(inode), 2846 _nfs4_proc_readlink(inode, page, pgbase, pglen), 2847 &exception); 2848 } while (exception.retry); 2849 return err; 2850 } 2851 2852 /* 2853 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 2854 */ 2855 static int 2856 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 2857 int flags) 2858 { 2859 struct nfs_open_context *ctx; 2860 struct nfs4_state *state; 2861 int status = 0; 2862 2863 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 2864 if (IS_ERR(ctx)) 2865 return PTR_ERR(ctx); 2866 2867 sattr->ia_mode &= ~current_umask(); 2868 state = nfs4_do_open(dir, dentry, ctx->mode, 2869 flags, sattr, ctx->cred, 2870 &ctx->mdsthreshold); 2871 d_drop(dentry); 2872 if (IS_ERR(state)) { 2873 status = PTR_ERR(state); 2874 goto out; 2875 } 2876 d_add(dentry, igrab(state->inode)); 2877 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 2878 ctx->state = state; 2879 out: 2880 put_nfs_open_context(ctx); 2881 return status; 2882 } 2883 2884 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 2885 { 2886 struct nfs_server *server = NFS_SERVER(dir); 2887 struct nfs_removeargs args = { 2888 .fh = NFS_FH(dir), 2889 .name = *name, 2890 }; 2891 struct nfs_removeres res = { 2892 .server = server, 2893 }; 2894 struct rpc_message msg = { 2895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 2896 .rpc_argp = &args, 2897 .rpc_resp = &res, 2898 }; 2899 int status; 2900 2901 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 2902 if (status == 0) 2903 update_changeattr(dir, &res.cinfo); 2904 return status; 2905 } 2906 2907 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 2908 { 2909 struct nfs4_exception exception = { }; 2910 int err; 2911 do { 2912 err = nfs4_handle_exception(NFS_SERVER(dir), 2913 _nfs4_proc_remove(dir, name), 2914 &exception); 2915 } while (exception.retry); 2916 return err; 2917 } 2918 2919 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 2920 { 2921 struct nfs_server *server = NFS_SERVER(dir); 2922 struct nfs_removeargs *args = msg->rpc_argp; 2923 struct nfs_removeres *res = msg->rpc_resp; 2924 2925 res->server = server; 2926 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 2927 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1); 2928 } 2929 2930 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 2931 { 2932 nfs4_setup_sequence(NFS_SERVER(data->dir), 2933 &data->args.seq_args, 2934 &data->res.seq_res, 2935 task); 2936 } 2937 2938 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 2939 { 2940 struct nfs_removeres *res = task->tk_msg.rpc_resp; 2941 2942 if (!nfs4_sequence_done(task, &res->seq_res)) 2943 return 0; 2944 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 2945 return 0; 2946 update_changeattr(dir, &res->cinfo); 2947 return 1; 2948 } 2949 2950 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 2951 { 2952 struct nfs_server *server = NFS_SERVER(dir); 2953 struct nfs_renameargs *arg = msg->rpc_argp; 2954 struct nfs_renameres *res = msg->rpc_resp; 2955 2956 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 2957 res->server = server; 2958 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1); 2959 } 2960 2961 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 2962 { 2963 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 2964 &data->args.seq_args, 2965 &data->res.seq_res, 2966 task); 2967 } 2968 2969 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 2970 struct inode *new_dir) 2971 { 2972 struct nfs_renameres *res = task->tk_msg.rpc_resp; 2973 2974 if (!nfs4_sequence_done(task, &res->seq_res)) 2975 return 0; 2976 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 2977 return 0; 2978 2979 update_changeattr(old_dir, &res->old_cinfo); 2980 update_changeattr(new_dir, &res->new_cinfo); 2981 return 1; 2982 } 2983 2984 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 2985 struct inode *new_dir, struct qstr *new_name) 2986 { 2987 struct nfs_server *server = NFS_SERVER(old_dir); 2988 struct nfs_renameargs arg = { 2989 .old_dir = NFS_FH(old_dir), 2990 .new_dir = NFS_FH(new_dir), 2991 .old_name = old_name, 2992 .new_name = new_name, 2993 }; 2994 struct nfs_renameres res = { 2995 .server = server, 2996 }; 2997 struct rpc_message msg = { 2998 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], 2999 .rpc_argp = &arg, 3000 .rpc_resp = &res, 3001 }; 3002 int status = -ENOMEM; 3003 3004 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3005 if (!status) { 3006 update_changeattr(old_dir, &res.old_cinfo); 3007 update_changeattr(new_dir, &res.new_cinfo); 3008 } 3009 return status; 3010 } 3011 3012 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 3013 struct inode *new_dir, struct qstr *new_name) 3014 { 3015 struct nfs4_exception exception = { }; 3016 int err; 3017 do { 3018 err = nfs4_handle_exception(NFS_SERVER(old_dir), 3019 _nfs4_proc_rename(old_dir, old_name, 3020 new_dir, new_name), 3021 &exception); 3022 } while (exception.retry); 3023 return err; 3024 } 3025 3026 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3027 { 3028 struct nfs_server *server = NFS_SERVER(inode); 3029 struct nfs4_link_arg arg = { 3030 .fh = NFS_FH(inode), 3031 .dir_fh = NFS_FH(dir), 3032 .name = name, 3033 .bitmask = server->attr_bitmask, 3034 }; 3035 struct nfs4_link_res res = { 3036 .server = server, 3037 }; 3038 struct rpc_message msg = { 3039 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3040 .rpc_argp = &arg, 3041 .rpc_resp = &res, 3042 }; 3043 int status = -ENOMEM; 3044 3045 res.fattr = nfs_alloc_fattr(); 3046 if (res.fattr == NULL) 3047 goto out; 3048 3049 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3050 if (!status) { 3051 update_changeattr(dir, &res.cinfo); 3052 nfs_post_op_update_inode(inode, res.fattr); 3053 } 3054 out: 3055 nfs_free_fattr(res.fattr); 3056 return status; 3057 } 3058 3059 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3060 { 3061 struct nfs4_exception exception = { }; 3062 int err; 3063 do { 3064 err = nfs4_handle_exception(NFS_SERVER(inode), 3065 _nfs4_proc_link(inode, dir, name), 3066 &exception); 3067 } while (exception.retry); 3068 return err; 3069 } 3070 3071 struct nfs4_createdata { 3072 struct rpc_message msg; 3073 struct nfs4_create_arg arg; 3074 struct nfs4_create_res res; 3075 struct nfs_fh fh; 3076 struct nfs_fattr fattr; 3077 }; 3078 3079 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3080 struct qstr *name, struct iattr *sattr, u32 ftype) 3081 { 3082 struct nfs4_createdata *data; 3083 3084 data = kzalloc(sizeof(*data), GFP_KERNEL); 3085 if (data != NULL) { 3086 struct nfs_server *server = NFS_SERVER(dir); 3087 3088 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3089 data->msg.rpc_argp = &data->arg; 3090 data->msg.rpc_resp = &data->res; 3091 data->arg.dir_fh = NFS_FH(dir); 3092 data->arg.server = server; 3093 data->arg.name = name; 3094 data->arg.attrs = sattr; 3095 data->arg.ftype = ftype; 3096 data->arg.bitmask = server->attr_bitmask; 3097 data->res.server = server; 3098 data->res.fh = &data->fh; 3099 data->res.fattr = &data->fattr; 3100 nfs_fattr_init(data->res.fattr); 3101 } 3102 return data; 3103 } 3104 3105 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3106 { 3107 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3108 &data->arg.seq_args, &data->res.seq_res, 1); 3109 if (status == 0) { 3110 update_changeattr(dir, &data->res.dir_cinfo); 3111 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 3112 } 3113 return status; 3114 } 3115 3116 static void nfs4_free_createdata(struct nfs4_createdata *data) 3117 { 3118 kfree(data); 3119 } 3120 3121 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3122 struct page *page, unsigned int len, struct iattr *sattr) 3123 { 3124 struct nfs4_createdata *data; 3125 int status = -ENAMETOOLONG; 3126 3127 if (len > NFS4_MAXPATHLEN) 3128 goto out; 3129 3130 status = -ENOMEM; 3131 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3132 if (data == NULL) 3133 goto out; 3134 3135 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3136 data->arg.u.symlink.pages = &page; 3137 data->arg.u.symlink.len = len; 3138 3139 status = nfs4_do_create(dir, dentry, data); 3140 3141 nfs4_free_createdata(data); 3142 out: 3143 return status; 3144 } 3145 3146 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3147 struct page *page, unsigned int len, struct iattr *sattr) 3148 { 3149 struct nfs4_exception exception = { }; 3150 int err; 3151 do { 3152 err = nfs4_handle_exception(NFS_SERVER(dir), 3153 _nfs4_proc_symlink(dir, dentry, page, 3154 len, sattr), 3155 &exception); 3156 } while (exception.retry); 3157 return err; 3158 } 3159 3160 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3161 struct iattr *sattr) 3162 { 3163 struct nfs4_createdata *data; 3164 int status = -ENOMEM; 3165 3166 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 3167 if (data == NULL) 3168 goto out; 3169 3170 status = nfs4_do_create(dir, dentry, data); 3171 3172 nfs4_free_createdata(data); 3173 out: 3174 return status; 3175 } 3176 3177 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3178 struct iattr *sattr) 3179 { 3180 struct nfs4_exception exception = { }; 3181 int err; 3182 3183 sattr->ia_mode &= ~current_umask(); 3184 do { 3185 err = nfs4_handle_exception(NFS_SERVER(dir), 3186 _nfs4_proc_mkdir(dir, dentry, sattr), 3187 &exception); 3188 } while (exception.retry); 3189 return err; 3190 } 3191 3192 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3193 u64 cookie, struct page **pages, unsigned int count, int plus) 3194 { 3195 struct inode *dir = dentry->d_inode; 3196 struct nfs4_readdir_arg args = { 3197 .fh = NFS_FH(dir), 3198 .pages = pages, 3199 .pgbase = 0, 3200 .count = count, 3201 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 3202 .plus = plus, 3203 }; 3204 struct nfs4_readdir_res res; 3205 struct rpc_message msg = { 3206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 3207 .rpc_argp = &args, 3208 .rpc_resp = &res, 3209 .rpc_cred = cred, 3210 }; 3211 int status; 3212 3213 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__, 3214 dentry->d_parent->d_name.name, 3215 dentry->d_name.name, 3216 (unsigned long long)cookie); 3217 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 3218 res.pgbase = args.pgbase; 3219 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 3220 if (status >= 0) { 3221 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 3222 status += args.pgbase; 3223 } 3224 3225 nfs_invalidate_atime(dir); 3226 3227 dprintk("%s: returns %d\n", __func__, status); 3228 return status; 3229 } 3230 3231 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3232 u64 cookie, struct page **pages, unsigned int count, int plus) 3233 { 3234 struct nfs4_exception exception = { }; 3235 int err; 3236 do { 3237 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), 3238 _nfs4_proc_readdir(dentry, cred, cookie, 3239 pages, count, plus), 3240 &exception); 3241 } while (exception.retry); 3242 return err; 3243 } 3244 3245 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3246 struct iattr *sattr, dev_t rdev) 3247 { 3248 struct nfs4_createdata *data; 3249 int mode = sattr->ia_mode; 3250 int status = -ENOMEM; 3251 3252 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 3253 if (data == NULL) 3254 goto out; 3255 3256 if (S_ISFIFO(mode)) 3257 data->arg.ftype = NF4FIFO; 3258 else if (S_ISBLK(mode)) { 3259 data->arg.ftype = NF4BLK; 3260 data->arg.u.device.specdata1 = MAJOR(rdev); 3261 data->arg.u.device.specdata2 = MINOR(rdev); 3262 } 3263 else if (S_ISCHR(mode)) { 3264 data->arg.ftype = NF4CHR; 3265 data->arg.u.device.specdata1 = MAJOR(rdev); 3266 data->arg.u.device.specdata2 = MINOR(rdev); 3267 } else if (!S_ISSOCK(mode)) { 3268 status = -EINVAL; 3269 goto out_free; 3270 } 3271 3272 status = nfs4_do_create(dir, dentry, data); 3273 out_free: 3274 nfs4_free_createdata(data); 3275 out: 3276 return status; 3277 } 3278 3279 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3280 struct iattr *sattr, dev_t rdev) 3281 { 3282 struct nfs4_exception exception = { }; 3283 int err; 3284 3285 sattr->ia_mode &= ~current_umask(); 3286 do { 3287 err = nfs4_handle_exception(NFS_SERVER(dir), 3288 _nfs4_proc_mknod(dir, dentry, sattr, rdev), 3289 &exception); 3290 } while (exception.retry); 3291 return err; 3292 } 3293 3294 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 3295 struct nfs_fsstat *fsstat) 3296 { 3297 struct nfs4_statfs_arg args = { 3298 .fh = fhandle, 3299 .bitmask = server->attr_bitmask, 3300 }; 3301 struct nfs4_statfs_res res = { 3302 .fsstat = fsstat, 3303 }; 3304 struct rpc_message msg = { 3305 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 3306 .rpc_argp = &args, 3307 .rpc_resp = &res, 3308 }; 3309 3310 nfs_fattr_init(fsstat->fattr); 3311 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3312 } 3313 3314 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 3315 { 3316 struct nfs4_exception exception = { }; 3317 int err; 3318 do { 3319 err = nfs4_handle_exception(server, 3320 _nfs4_proc_statfs(server, fhandle, fsstat), 3321 &exception); 3322 } while (exception.retry); 3323 return err; 3324 } 3325 3326 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 3327 struct nfs_fsinfo *fsinfo) 3328 { 3329 struct nfs4_fsinfo_arg args = { 3330 .fh = fhandle, 3331 .bitmask = server->attr_bitmask, 3332 }; 3333 struct nfs4_fsinfo_res res = { 3334 .fsinfo = fsinfo, 3335 }; 3336 struct rpc_message msg = { 3337 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 3338 .rpc_argp = &args, 3339 .rpc_resp = &res, 3340 }; 3341 3342 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3343 } 3344 3345 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3346 { 3347 struct nfs4_exception exception = { }; 3348 int err; 3349 3350 do { 3351 err = nfs4_handle_exception(server, 3352 _nfs4_do_fsinfo(server, fhandle, fsinfo), 3353 &exception); 3354 } while (exception.retry); 3355 return err; 3356 } 3357 3358 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3359 { 3360 int error; 3361 3362 nfs_fattr_init(fsinfo->fattr); 3363 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 3364 if (error == 0) { 3365 /* block layout checks this! */ 3366 server->pnfs_blksize = fsinfo->blksize; 3367 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 3368 } 3369 3370 return error; 3371 } 3372 3373 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 3374 struct nfs_pathconf *pathconf) 3375 { 3376 struct nfs4_pathconf_arg args = { 3377 .fh = fhandle, 3378 .bitmask = server->attr_bitmask, 3379 }; 3380 struct nfs4_pathconf_res res = { 3381 .pathconf = pathconf, 3382 }; 3383 struct rpc_message msg = { 3384 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 3385 .rpc_argp = &args, 3386 .rpc_resp = &res, 3387 }; 3388 3389 /* None of the pathconf attributes are mandatory to implement */ 3390 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 3391 memset(pathconf, 0, sizeof(*pathconf)); 3392 return 0; 3393 } 3394 3395 nfs_fattr_init(pathconf->fattr); 3396 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3397 } 3398 3399 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 3400 struct nfs_pathconf *pathconf) 3401 { 3402 struct nfs4_exception exception = { }; 3403 int err; 3404 3405 do { 3406 err = nfs4_handle_exception(server, 3407 _nfs4_proc_pathconf(server, fhandle, pathconf), 3408 &exception); 3409 } while (exception.retry); 3410 return err; 3411 } 3412 3413 void __nfs4_read_done_cb(struct nfs_read_data *data) 3414 { 3415 nfs_invalidate_atime(data->header->inode); 3416 } 3417 3418 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data) 3419 { 3420 struct nfs_server *server = NFS_SERVER(data->header->inode); 3421 3422 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) { 3423 rpc_restart_call_prepare(task); 3424 return -EAGAIN; 3425 } 3426 3427 __nfs4_read_done_cb(data); 3428 if (task->tk_status > 0) 3429 renew_lease(server, data->timestamp); 3430 return 0; 3431 } 3432 3433 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) 3434 { 3435 3436 dprintk("--> %s\n", __func__); 3437 3438 if (!nfs4_sequence_done(task, &data->res.seq_res)) 3439 return -EAGAIN; 3440 3441 return data->read_done_cb ? data->read_done_cb(task, data) : 3442 nfs4_read_done_cb(task, data); 3443 } 3444 3445 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) 3446 { 3447 data->timestamp = jiffies; 3448 data->read_done_cb = nfs4_read_done_cb; 3449 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 3450 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 3451 } 3452 3453 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data) 3454 { 3455 nfs4_setup_sequence(NFS_SERVER(data->header->inode), 3456 &data->args.seq_args, 3457 &data->res.seq_res, 3458 task); 3459 } 3460 3461 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data) 3462 { 3463 struct inode *inode = data->header->inode; 3464 3465 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) { 3466 rpc_restart_call_prepare(task); 3467 return -EAGAIN; 3468 } 3469 if (task->tk_status >= 0) { 3470 renew_lease(NFS_SERVER(inode), data->timestamp); 3471 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 3472 } 3473 return 0; 3474 } 3475 3476 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) 3477 { 3478 if (!nfs4_sequence_done(task, &data->res.seq_res)) 3479 return -EAGAIN; 3480 return data->write_done_cb ? data->write_done_cb(task, data) : 3481 nfs4_write_done_cb(task, data); 3482 } 3483 3484 static 3485 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data) 3486 { 3487 const struct nfs_pgio_header *hdr = data->header; 3488 3489 /* Don't request attributes for pNFS or O_DIRECT writes */ 3490 if (data->ds_clp != NULL || hdr->dreq != NULL) 3491 return false; 3492 /* Otherwise, request attributes if and only if we don't hold 3493 * a delegation 3494 */ 3495 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 3496 } 3497 3498 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) 3499 { 3500 struct nfs_server *server = NFS_SERVER(data->header->inode); 3501 3502 if (!nfs4_write_need_cache_consistency_data(data)) { 3503 data->args.bitmask = NULL; 3504 data->res.fattr = NULL; 3505 } else 3506 data->args.bitmask = server->cache_consistency_bitmask; 3507 3508 if (!data->write_done_cb) 3509 data->write_done_cb = nfs4_write_done_cb; 3510 data->res.server = server; 3511 data->timestamp = jiffies; 3512 3513 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 3514 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 3515 } 3516 3517 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data) 3518 { 3519 nfs4_setup_sequence(NFS_SERVER(data->header->inode), 3520 &data->args.seq_args, 3521 &data->res.seq_res, 3522 task); 3523 } 3524 3525 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 3526 { 3527 nfs4_setup_sequence(NFS_SERVER(data->inode), 3528 &data->args.seq_args, 3529 &data->res.seq_res, 3530 task); 3531 } 3532 3533 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 3534 { 3535 struct inode *inode = data->inode; 3536 3537 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) { 3538 rpc_restart_call_prepare(task); 3539 return -EAGAIN; 3540 } 3541 return 0; 3542 } 3543 3544 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 3545 { 3546 if (!nfs4_sequence_done(task, &data->res.seq_res)) 3547 return -EAGAIN; 3548 return data->commit_done_cb(task, data); 3549 } 3550 3551 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 3552 { 3553 struct nfs_server *server = NFS_SERVER(data->inode); 3554 3555 if (data->commit_done_cb == NULL) 3556 data->commit_done_cb = nfs4_commit_done_cb; 3557 data->res.server = server; 3558 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 3559 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 3560 } 3561 3562 struct nfs4_renewdata { 3563 struct nfs_client *client; 3564 unsigned long timestamp; 3565 }; 3566 3567 /* 3568 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 3569 * standalone procedure for queueing an asynchronous RENEW. 3570 */ 3571 static void nfs4_renew_release(void *calldata) 3572 { 3573 struct nfs4_renewdata *data = calldata; 3574 struct nfs_client *clp = data->client; 3575 3576 if (atomic_read(&clp->cl_count) > 1) 3577 nfs4_schedule_state_renewal(clp); 3578 nfs_put_client(clp); 3579 kfree(data); 3580 } 3581 3582 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 3583 { 3584 struct nfs4_renewdata *data = calldata; 3585 struct nfs_client *clp = data->client; 3586 unsigned long timestamp = data->timestamp; 3587 3588 if (task->tk_status < 0) { 3589 /* Unless we're shutting down, schedule state recovery! */ 3590 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 3591 return; 3592 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 3593 nfs4_schedule_lease_recovery(clp); 3594 return; 3595 } 3596 nfs4_schedule_path_down_recovery(clp); 3597 } 3598 do_renew_lease(clp, timestamp); 3599 } 3600 3601 static const struct rpc_call_ops nfs4_renew_ops = { 3602 .rpc_call_done = nfs4_renew_done, 3603 .rpc_release = nfs4_renew_release, 3604 }; 3605 3606 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 3607 { 3608 struct rpc_message msg = { 3609 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 3610 .rpc_argp = clp, 3611 .rpc_cred = cred, 3612 }; 3613 struct nfs4_renewdata *data; 3614 3615 if (renew_flags == 0) 3616 return 0; 3617 if (!atomic_inc_not_zero(&clp->cl_count)) 3618 return -EIO; 3619 data = kmalloc(sizeof(*data), GFP_NOFS); 3620 if (data == NULL) 3621 return -ENOMEM; 3622 data->client = clp; 3623 data->timestamp = jiffies; 3624 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, 3625 &nfs4_renew_ops, data); 3626 } 3627 3628 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 3629 { 3630 struct rpc_message msg = { 3631 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 3632 .rpc_argp = clp, 3633 .rpc_cred = cred, 3634 }; 3635 unsigned long now = jiffies; 3636 int status; 3637 3638 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 3639 if (status < 0) 3640 return status; 3641 do_renew_lease(clp, now); 3642 return 0; 3643 } 3644 3645 static inline int nfs4_server_supports_acls(struct nfs_server *server) 3646 { 3647 return (server->caps & NFS_CAP_ACLS) 3648 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3649 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); 3650 } 3651 3652 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 3653 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 3654 * the stack. 3655 */ 3656 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 3657 3658 static int buf_to_pages_noslab(const void *buf, size_t buflen, 3659 struct page **pages, unsigned int *pgbase) 3660 { 3661 struct page *newpage, **spages; 3662 int rc = 0; 3663 size_t len; 3664 spages = pages; 3665 3666 do { 3667 len = min_t(size_t, PAGE_SIZE, buflen); 3668 newpage = alloc_page(GFP_KERNEL); 3669 3670 if (newpage == NULL) 3671 goto unwind; 3672 memcpy(page_address(newpage), buf, len); 3673 buf += len; 3674 buflen -= len; 3675 *pages++ = newpage; 3676 rc++; 3677 } while (buflen != 0); 3678 3679 return rc; 3680 3681 unwind: 3682 for(; rc > 0; rc--) 3683 __free_page(spages[rc-1]); 3684 return -ENOMEM; 3685 } 3686 3687 struct nfs4_cached_acl { 3688 int cached; 3689 size_t len; 3690 char data[0]; 3691 }; 3692 3693 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 3694 { 3695 struct nfs_inode *nfsi = NFS_I(inode); 3696 3697 spin_lock(&inode->i_lock); 3698 kfree(nfsi->nfs4_acl); 3699 nfsi->nfs4_acl = acl; 3700 spin_unlock(&inode->i_lock); 3701 } 3702 3703 static void nfs4_zap_acl_attr(struct inode *inode) 3704 { 3705 nfs4_set_cached_acl(inode, NULL); 3706 } 3707 3708 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 3709 { 3710 struct nfs_inode *nfsi = NFS_I(inode); 3711 struct nfs4_cached_acl *acl; 3712 int ret = -ENOENT; 3713 3714 spin_lock(&inode->i_lock); 3715 acl = nfsi->nfs4_acl; 3716 if (acl == NULL) 3717 goto out; 3718 if (buf == NULL) /* user is just asking for length */ 3719 goto out_len; 3720 if (acl->cached == 0) 3721 goto out; 3722 ret = -ERANGE; /* see getxattr(2) man page */ 3723 if (acl->len > buflen) 3724 goto out; 3725 memcpy(buf, acl->data, acl->len); 3726 out_len: 3727 ret = acl->len; 3728 out: 3729 spin_unlock(&inode->i_lock); 3730 return ret; 3731 } 3732 3733 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 3734 { 3735 struct nfs4_cached_acl *acl; 3736 size_t buflen = sizeof(*acl) + acl_len; 3737 3738 if (buflen <= PAGE_SIZE) { 3739 acl = kmalloc(buflen, GFP_KERNEL); 3740 if (acl == NULL) 3741 goto out; 3742 acl->cached = 1; 3743 _copy_from_pages(acl->data, pages, pgbase, acl_len); 3744 } else { 3745 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 3746 if (acl == NULL) 3747 goto out; 3748 acl->cached = 0; 3749 } 3750 acl->len = acl_len; 3751 out: 3752 nfs4_set_cached_acl(inode, acl); 3753 } 3754 3755 /* 3756 * The getxattr API returns the required buffer length when called with a 3757 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 3758 * the required buf. On a NULL buf, we send a page of data to the server 3759 * guessing that the ACL request can be serviced by a page. If so, we cache 3760 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 3761 * the cache. If not so, we throw away the page, and cache the required 3762 * length. The next getxattr call will then produce another round trip to 3763 * the server, this time with the input buf of the required size. 3764 */ 3765 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 3766 { 3767 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 3768 struct nfs_getaclargs args = { 3769 .fh = NFS_FH(inode), 3770 .acl_pages = pages, 3771 .acl_len = buflen, 3772 }; 3773 struct nfs_getaclres res = { 3774 .acl_len = buflen, 3775 }; 3776 struct rpc_message msg = { 3777 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 3778 .rpc_argp = &args, 3779 .rpc_resp = &res, 3780 }; 3781 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 3782 int ret = -ENOMEM, i; 3783 3784 /* As long as we're doing a round trip to the server anyway, 3785 * let's be prepared for a page of acl data. */ 3786 if (npages == 0) 3787 npages = 1; 3788 if (npages > ARRAY_SIZE(pages)) 3789 return -ERANGE; 3790 3791 for (i = 0; i < npages; i++) { 3792 pages[i] = alloc_page(GFP_KERNEL); 3793 if (!pages[i]) 3794 goto out_free; 3795 } 3796 3797 /* for decoding across pages */ 3798 res.acl_scratch = alloc_page(GFP_KERNEL); 3799 if (!res.acl_scratch) 3800 goto out_free; 3801 3802 args.acl_len = npages * PAGE_SIZE; 3803 args.acl_pgbase = 0; 3804 3805 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 3806 __func__, buf, buflen, npages, args.acl_len); 3807 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 3808 &msg, &args.seq_args, &res.seq_res, 0); 3809 if (ret) 3810 goto out_free; 3811 3812 /* Handle the case where the passed-in buffer is too short */ 3813 if (res.acl_flags & NFS4_ACL_TRUNC) { 3814 /* Did the user only issue a request for the acl length? */ 3815 if (buf == NULL) 3816 goto out_ok; 3817 ret = -ERANGE; 3818 goto out_free; 3819 } 3820 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 3821 if (buf) { 3822 if (res.acl_len > buflen) { 3823 ret = -ERANGE; 3824 goto out_free; 3825 } 3826 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 3827 } 3828 out_ok: 3829 ret = res.acl_len; 3830 out_free: 3831 for (i = 0; i < npages; i++) 3832 if (pages[i]) 3833 __free_page(pages[i]); 3834 if (res.acl_scratch) 3835 __free_page(res.acl_scratch); 3836 return ret; 3837 } 3838 3839 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 3840 { 3841 struct nfs4_exception exception = { }; 3842 ssize_t ret; 3843 do { 3844 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 3845 if (ret >= 0) 3846 break; 3847 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 3848 } while (exception.retry); 3849 return ret; 3850 } 3851 3852 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 3853 { 3854 struct nfs_server *server = NFS_SERVER(inode); 3855 int ret; 3856 3857 if (!nfs4_server_supports_acls(server)) 3858 return -EOPNOTSUPP; 3859 ret = nfs_revalidate_inode(server, inode); 3860 if (ret < 0) 3861 return ret; 3862 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 3863 nfs_zap_acl_cache(inode); 3864 ret = nfs4_read_cached_acl(inode, buf, buflen); 3865 if (ret != -ENOENT) 3866 /* -ENOENT is returned if there is no ACL or if there is an ACL 3867 * but no cached acl data, just the acl length */ 3868 return ret; 3869 return nfs4_get_acl_uncached(inode, buf, buflen); 3870 } 3871 3872 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 3873 { 3874 struct nfs_server *server = NFS_SERVER(inode); 3875 struct page *pages[NFS4ACL_MAXPAGES]; 3876 struct nfs_setaclargs arg = { 3877 .fh = NFS_FH(inode), 3878 .acl_pages = pages, 3879 .acl_len = buflen, 3880 }; 3881 struct nfs_setaclres res; 3882 struct rpc_message msg = { 3883 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 3884 .rpc_argp = &arg, 3885 .rpc_resp = &res, 3886 }; 3887 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 3888 int ret, i; 3889 3890 if (!nfs4_server_supports_acls(server)) 3891 return -EOPNOTSUPP; 3892 if (npages > ARRAY_SIZE(pages)) 3893 return -ERANGE; 3894 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 3895 if (i < 0) 3896 return i; 3897 nfs4_inode_return_delegation(inode); 3898 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3899 3900 /* 3901 * Free each page after tx, so the only ref left is 3902 * held by the network stack 3903 */ 3904 for (; i > 0; i--) 3905 put_page(pages[i-1]); 3906 3907 /* 3908 * Acl update can result in inode attribute update. 3909 * so mark the attribute cache invalid. 3910 */ 3911 spin_lock(&inode->i_lock); 3912 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 3913 spin_unlock(&inode->i_lock); 3914 nfs_access_zap_cache(inode); 3915 nfs_zap_acl_cache(inode); 3916 return ret; 3917 } 3918 3919 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 3920 { 3921 struct nfs4_exception exception = { }; 3922 int err; 3923 do { 3924 err = nfs4_handle_exception(NFS_SERVER(inode), 3925 __nfs4_proc_set_acl(inode, buf, buflen), 3926 &exception); 3927 } while (exception.retry); 3928 return err; 3929 } 3930 3931 static int 3932 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state) 3933 { 3934 struct nfs_client *clp = server->nfs_client; 3935 3936 if (task->tk_status >= 0) 3937 return 0; 3938 switch(task->tk_status) { 3939 case -NFS4ERR_DELEG_REVOKED: 3940 case -NFS4ERR_ADMIN_REVOKED: 3941 case -NFS4ERR_BAD_STATEID: 3942 if (state == NULL) 3943 break; 3944 nfs_remove_bad_delegation(state->inode); 3945 case -NFS4ERR_OPENMODE: 3946 if (state == NULL) 3947 break; 3948 nfs4_schedule_stateid_recovery(server, state); 3949 goto wait_on_recovery; 3950 case -NFS4ERR_EXPIRED: 3951 if (state != NULL) 3952 nfs4_schedule_stateid_recovery(server, state); 3953 case -NFS4ERR_STALE_STATEID: 3954 case -NFS4ERR_STALE_CLIENTID: 3955 nfs4_schedule_lease_recovery(clp); 3956 goto wait_on_recovery; 3957 #if defined(CONFIG_NFS_V4_1) 3958 case -NFS4ERR_BADSESSION: 3959 case -NFS4ERR_BADSLOT: 3960 case -NFS4ERR_BAD_HIGH_SLOT: 3961 case -NFS4ERR_DEADSESSION: 3962 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 3963 case -NFS4ERR_SEQ_FALSE_RETRY: 3964 case -NFS4ERR_SEQ_MISORDERED: 3965 dprintk("%s ERROR %d, Reset session\n", __func__, 3966 task->tk_status); 3967 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 3968 task->tk_status = 0; 3969 return -EAGAIN; 3970 #endif /* CONFIG_NFS_V4_1 */ 3971 case -NFS4ERR_DELAY: 3972 nfs_inc_server_stats(server, NFSIOS_DELAY); 3973 case -NFS4ERR_GRACE: 3974 rpc_delay(task, NFS4_POLL_RETRY_MAX); 3975 task->tk_status = 0; 3976 return -EAGAIN; 3977 case -NFS4ERR_RETRY_UNCACHED_REP: 3978 case -NFS4ERR_OLD_STATEID: 3979 task->tk_status = 0; 3980 return -EAGAIN; 3981 } 3982 task->tk_status = nfs4_map_errors(task->tk_status); 3983 return 0; 3984 wait_on_recovery: 3985 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 3986 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 3987 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 3988 task->tk_status = 0; 3989 return -EAGAIN; 3990 } 3991 3992 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 3993 nfs4_verifier *bootverf) 3994 { 3995 __be32 verf[2]; 3996 3997 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 3998 /* An impossible timestamp guarantees this value 3999 * will never match a generated boot time. */ 4000 verf[0] = 0; 4001 verf[1] = (__be32)(NSEC_PER_SEC + 1); 4002 } else { 4003 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 4004 verf[0] = (__be32)nn->boot_time.tv_sec; 4005 verf[1] = (__be32)nn->boot_time.tv_nsec; 4006 } 4007 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 4008 } 4009 4010 static unsigned int 4011 nfs4_init_nonuniform_client_string(const struct nfs_client *clp, 4012 char *buf, size_t len) 4013 { 4014 unsigned int result; 4015 4016 rcu_read_lock(); 4017 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s", 4018 clp->cl_ipaddr, 4019 rpc_peeraddr2str(clp->cl_rpcclient, 4020 RPC_DISPLAY_ADDR), 4021 rpc_peeraddr2str(clp->cl_rpcclient, 4022 RPC_DISPLAY_PROTO)); 4023 rcu_read_unlock(); 4024 return result; 4025 } 4026 4027 static unsigned int 4028 nfs4_init_uniform_client_string(const struct nfs_client *clp, 4029 char *buf, size_t len) 4030 { 4031 char *nodename = clp->cl_rpcclient->cl_nodename; 4032 4033 if (nfs4_client_id_uniquifier[0] != '\0') 4034 nodename = nfs4_client_id_uniquifier; 4035 return scnprintf(buf, len, "Linux NFSv%u.%u %s", 4036 clp->rpc_ops->version, clp->cl_minorversion, 4037 nodename); 4038 } 4039 4040 /** 4041 * nfs4_proc_setclientid - Negotiate client ID 4042 * @clp: state data structure 4043 * @program: RPC program for NFSv4 callback service 4044 * @port: IP port number for NFS4 callback service 4045 * @cred: RPC credential to use for this call 4046 * @res: where to place the result 4047 * 4048 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4049 */ 4050 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 4051 unsigned short port, struct rpc_cred *cred, 4052 struct nfs4_setclientid_res *res) 4053 { 4054 nfs4_verifier sc_verifier; 4055 struct nfs4_setclientid setclientid = { 4056 .sc_verifier = &sc_verifier, 4057 .sc_prog = program, 4058 .sc_cb_ident = clp->cl_cb_ident, 4059 }; 4060 struct rpc_message msg = { 4061 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 4062 .rpc_argp = &setclientid, 4063 .rpc_resp = res, 4064 .rpc_cred = cred, 4065 }; 4066 int status; 4067 4068 /* nfs_client_id4 */ 4069 nfs4_init_boot_verifier(clp, &sc_verifier); 4070 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 4071 setclientid.sc_name_len = 4072 nfs4_init_uniform_client_string(clp, 4073 setclientid.sc_name, 4074 sizeof(setclientid.sc_name)); 4075 else 4076 setclientid.sc_name_len = 4077 nfs4_init_nonuniform_client_string(clp, 4078 setclientid.sc_name, 4079 sizeof(setclientid.sc_name)); 4080 /* cb_client4 */ 4081 rcu_read_lock(); 4082 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, 4083 sizeof(setclientid.sc_netid), 4084 rpc_peeraddr2str(clp->cl_rpcclient, 4085 RPC_DISPLAY_NETID)); 4086 rcu_read_unlock(); 4087 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 4088 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 4089 clp->cl_ipaddr, port >> 8, port & 255); 4090 4091 dprintk("NFS call setclientid auth=%s, '%.*s'\n", 4092 clp->cl_rpcclient->cl_auth->au_ops->au_name, 4093 setclientid.sc_name_len, setclientid.sc_name); 4094 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4095 dprintk("NFS reply setclientid: %d\n", status); 4096 return status; 4097 } 4098 4099 /** 4100 * nfs4_proc_setclientid_confirm - Confirm client ID 4101 * @clp: state data structure 4102 * @res: result of a previous SETCLIENTID 4103 * @cred: RPC credential to use for this call 4104 * 4105 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4106 */ 4107 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 4108 struct nfs4_setclientid_res *arg, 4109 struct rpc_cred *cred) 4110 { 4111 struct nfs_fsinfo fsinfo; 4112 struct rpc_message msg = { 4113 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 4114 .rpc_argp = arg, 4115 .rpc_resp = &fsinfo, 4116 .rpc_cred = cred, 4117 }; 4118 unsigned long now; 4119 int status; 4120 4121 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 4122 clp->cl_rpcclient->cl_auth->au_ops->au_name, 4123 clp->cl_clientid); 4124 now = jiffies; 4125 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4126 if (status == 0) { 4127 spin_lock(&clp->cl_lock); 4128 clp->cl_lease_time = fsinfo.lease_time * HZ; 4129 clp->cl_last_renewal = now; 4130 spin_unlock(&clp->cl_lock); 4131 } 4132 dprintk("NFS reply setclientid_confirm: %d\n", status); 4133 return status; 4134 } 4135 4136 struct nfs4_delegreturndata { 4137 struct nfs4_delegreturnargs args; 4138 struct nfs4_delegreturnres res; 4139 struct nfs_fh fh; 4140 nfs4_stateid stateid; 4141 unsigned long timestamp; 4142 struct nfs_fattr fattr; 4143 int rpc_status; 4144 }; 4145 4146 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 4147 { 4148 struct nfs4_delegreturndata *data = calldata; 4149 4150 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4151 return; 4152 4153 switch (task->tk_status) { 4154 case -NFS4ERR_STALE_STATEID: 4155 case -NFS4ERR_EXPIRED: 4156 case 0: 4157 renew_lease(data->res.server, data->timestamp); 4158 break; 4159 default: 4160 if (nfs4_async_handle_error(task, data->res.server, NULL) == 4161 -EAGAIN) { 4162 rpc_restart_call_prepare(task); 4163 return; 4164 } 4165 } 4166 data->rpc_status = task->tk_status; 4167 } 4168 4169 static void nfs4_delegreturn_release(void *calldata) 4170 { 4171 kfree(calldata); 4172 } 4173 4174 #if defined(CONFIG_NFS_V4_1) 4175 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 4176 { 4177 struct nfs4_delegreturndata *d_data; 4178 4179 d_data = (struct nfs4_delegreturndata *)data; 4180 4181 nfs4_setup_sequence(d_data->res.server, 4182 &d_data->args.seq_args, 4183 &d_data->res.seq_res, 4184 task); 4185 } 4186 #endif /* CONFIG_NFS_V4_1 */ 4187 4188 static const struct rpc_call_ops nfs4_delegreturn_ops = { 4189 #if defined(CONFIG_NFS_V4_1) 4190 .rpc_call_prepare = nfs4_delegreturn_prepare, 4191 #endif /* CONFIG_NFS_V4_1 */ 4192 .rpc_call_done = nfs4_delegreturn_done, 4193 .rpc_release = nfs4_delegreturn_release, 4194 }; 4195 4196 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 4197 { 4198 struct nfs4_delegreturndata *data; 4199 struct nfs_server *server = NFS_SERVER(inode); 4200 struct rpc_task *task; 4201 struct rpc_message msg = { 4202 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 4203 .rpc_cred = cred, 4204 }; 4205 struct rpc_task_setup task_setup_data = { 4206 .rpc_client = server->client, 4207 .rpc_message = &msg, 4208 .callback_ops = &nfs4_delegreturn_ops, 4209 .flags = RPC_TASK_ASYNC, 4210 }; 4211 int status = 0; 4212 4213 data = kzalloc(sizeof(*data), GFP_NOFS); 4214 if (data == NULL) 4215 return -ENOMEM; 4216 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4217 data->args.fhandle = &data->fh; 4218 data->args.stateid = &data->stateid; 4219 data->args.bitmask = server->cache_consistency_bitmask; 4220 nfs_copy_fh(&data->fh, NFS_FH(inode)); 4221 nfs4_stateid_copy(&data->stateid, stateid); 4222 data->res.fattr = &data->fattr; 4223 data->res.server = server; 4224 nfs_fattr_init(data->res.fattr); 4225 data->timestamp = jiffies; 4226 data->rpc_status = 0; 4227 4228 task_setup_data.callback_data = data; 4229 msg.rpc_argp = &data->args; 4230 msg.rpc_resp = &data->res; 4231 task = rpc_run_task(&task_setup_data); 4232 if (IS_ERR(task)) 4233 return PTR_ERR(task); 4234 if (!issync) 4235 goto out; 4236 status = nfs4_wait_for_completion_rpc_task(task); 4237 if (status != 0) 4238 goto out; 4239 status = data->rpc_status; 4240 if (status == 0) 4241 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 4242 else 4243 nfs_refresh_inode(inode, &data->fattr); 4244 out: 4245 rpc_put_task(task); 4246 return status; 4247 } 4248 4249 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 4250 { 4251 struct nfs_server *server = NFS_SERVER(inode); 4252 struct nfs4_exception exception = { }; 4253 int err; 4254 do { 4255 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 4256 switch (err) { 4257 case -NFS4ERR_STALE_STATEID: 4258 case -NFS4ERR_EXPIRED: 4259 case 0: 4260 return 0; 4261 } 4262 err = nfs4_handle_exception(server, err, &exception); 4263 } while (exception.retry); 4264 return err; 4265 } 4266 4267 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 4268 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 4269 4270 /* 4271 * sleep, with exponential backoff, and retry the LOCK operation. 4272 */ 4273 static unsigned long 4274 nfs4_set_lock_task_retry(unsigned long timeout) 4275 { 4276 freezable_schedule_timeout_killable(timeout); 4277 timeout <<= 1; 4278 if (timeout > NFS4_LOCK_MAXTIMEOUT) 4279 return NFS4_LOCK_MAXTIMEOUT; 4280 return timeout; 4281 } 4282 4283 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4284 { 4285 struct inode *inode = state->inode; 4286 struct nfs_server *server = NFS_SERVER(inode); 4287 struct nfs_client *clp = server->nfs_client; 4288 struct nfs_lockt_args arg = { 4289 .fh = NFS_FH(inode), 4290 .fl = request, 4291 }; 4292 struct nfs_lockt_res res = { 4293 .denied = request, 4294 }; 4295 struct rpc_message msg = { 4296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 4297 .rpc_argp = &arg, 4298 .rpc_resp = &res, 4299 .rpc_cred = state->owner->so_cred, 4300 }; 4301 struct nfs4_lock_state *lsp; 4302 int status; 4303 4304 arg.lock_owner.clientid = clp->cl_clientid; 4305 status = nfs4_set_lock_state(state, request); 4306 if (status != 0) 4307 goto out; 4308 lsp = request->fl_u.nfs4_fl.owner; 4309 arg.lock_owner.id = lsp->ls_seqid.owner_id; 4310 arg.lock_owner.s_dev = server->s_dev; 4311 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4312 switch (status) { 4313 case 0: 4314 request->fl_type = F_UNLCK; 4315 break; 4316 case -NFS4ERR_DENIED: 4317 status = 0; 4318 } 4319 request->fl_ops->fl_release_private(request); 4320 out: 4321 return status; 4322 } 4323 4324 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4325 { 4326 struct nfs4_exception exception = { }; 4327 int err; 4328 4329 do { 4330 err = nfs4_handle_exception(NFS_SERVER(state->inode), 4331 _nfs4_proc_getlk(state, cmd, request), 4332 &exception); 4333 } while (exception.retry); 4334 return err; 4335 } 4336 4337 static int do_vfs_lock(struct file *file, struct file_lock *fl) 4338 { 4339 int res = 0; 4340 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 4341 case FL_POSIX: 4342 res = posix_lock_file_wait(file, fl); 4343 break; 4344 case FL_FLOCK: 4345 res = flock_lock_file_wait(file, fl); 4346 break; 4347 default: 4348 BUG(); 4349 } 4350 return res; 4351 } 4352 4353 struct nfs4_unlockdata { 4354 struct nfs_locku_args arg; 4355 struct nfs_locku_res res; 4356 struct nfs4_lock_state *lsp; 4357 struct nfs_open_context *ctx; 4358 struct file_lock fl; 4359 const struct nfs_server *server; 4360 unsigned long timestamp; 4361 }; 4362 4363 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 4364 struct nfs_open_context *ctx, 4365 struct nfs4_lock_state *lsp, 4366 struct nfs_seqid *seqid) 4367 { 4368 struct nfs4_unlockdata *p; 4369 struct inode *inode = lsp->ls_state->inode; 4370 4371 p = kzalloc(sizeof(*p), GFP_NOFS); 4372 if (p == NULL) 4373 return NULL; 4374 p->arg.fh = NFS_FH(inode); 4375 p->arg.fl = &p->fl; 4376 p->arg.seqid = seqid; 4377 p->res.seqid = seqid; 4378 p->arg.stateid = &lsp->ls_stateid; 4379 p->lsp = lsp; 4380 atomic_inc(&lsp->ls_count); 4381 /* Ensure we don't close file until we're done freeing locks! */ 4382 p->ctx = get_nfs_open_context(ctx); 4383 memcpy(&p->fl, fl, sizeof(p->fl)); 4384 p->server = NFS_SERVER(inode); 4385 return p; 4386 } 4387 4388 static void nfs4_locku_release_calldata(void *data) 4389 { 4390 struct nfs4_unlockdata *calldata = data; 4391 nfs_free_seqid(calldata->arg.seqid); 4392 nfs4_put_lock_state(calldata->lsp); 4393 put_nfs_open_context(calldata->ctx); 4394 kfree(calldata); 4395 } 4396 4397 static void nfs4_locku_done(struct rpc_task *task, void *data) 4398 { 4399 struct nfs4_unlockdata *calldata = data; 4400 4401 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 4402 return; 4403 switch (task->tk_status) { 4404 case 0: 4405 nfs4_stateid_copy(&calldata->lsp->ls_stateid, 4406 &calldata->res.stateid); 4407 renew_lease(calldata->server, calldata->timestamp); 4408 break; 4409 case -NFS4ERR_BAD_STATEID: 4410 case -NFS4ERR_OLD_STATEID: 4411 case -NFS4ERR_STALE_STATEID: 4412 case -NFS4ERR_EXPIRED: 4413 break; 4414 default: 4415 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN) 4416 rpc_restart_call_prepare(task); 4417 } 4418 nfs_release_seqid(calldata->arg.seqid); 4419 } 4420 4421 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 4422 { 4423 struct nfs4_unlockdata *calldata = data; 4424 4425 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 4426 return; 4427 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 4428 /* Note: exit _without_ running nfs4_locku_done */ 4429 task->tk_action = NULL; 4430 nfs4_sequence_done(task, &calldata->res.seq_res); 4431 return; 4432 } 4433 calldata->timestamp = jiffies; 4434 if (nfs4_setup_sequence(calldata->server, 4435 &calldata->arg.seq_args, 4436 &calldata->res.seq_res, 4437 task) != 0) 4438 nfs_release_seqid(calldata->arg.seqid); 4439 } 4440 4441 static const struct rpc_call_ops nfs4_locku_ops = { 4442 .rpc_call_prepare = nfs4_locku_prepare, 4443 .rpc_call_done = nfs4_locku_done, 4444 .rpc_release = nfs4_locku_release_calldata, 4445 }; 4446 4447 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 4448 struct nfs_open_context *ctx, 4449 struct nfs4_lock_state *lsp, 4450 struct nfs_seqid *seqid) 4451 { 4452 struct nfs4_unlockdata *data; 4453 struct rpc_message msg = { 4454 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 4455 .rpc_cred = ctx->cred, 4456 }; 4457 struct rpc_task_setup task_setup_data = { 4458 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 4459 .rpc_message = &msg, 4460 .callback_ops = &nfs4_locku_ops, 4461 .workqueue = nfsiod_workqueue, 4462 .flags = RPC_TASK_ASYNC, 4463 }; 4464 4465 /* Ensure this is an unlock - when canceling a lock, the 4466 * canceled lock is passed in, and it won't be an unlock. 4467 */ 4468 fl->fl_type = F_UNLCK; 4469 4470 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 4471 if (data == NULL) { 4472 nfs_free_seqid(seqid); 4473 return ERR_PTR(-ENOMEM); 4474 } 4475 4476 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 4477 msg.rpc_argp = &data->arg; 4478 msg.rpc_resp = &data->res; 4479 task_setup_data.callback_data = data; 4480 return rpc_run_task(&task_setup_data); 4481 } 4482 4483 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 4484 { 4485 struct nfs_inode *nfsi = NFS_I(state->inode); 4486 struct nfs_seqid *seqid; 4487 struct nfs4_lock_state *lsp; 4488 struct rpc_task *task; 4489 int status = 0; 4490 unsigned char fl_flags = request->fl_flags; 4491 4492 status = nfs4_set_lock_state(state, request); 4493 /* Unlock _before_ we do the RPC call */ 4494 request->fl_flags |= FL_EXISTS; 4495 down_read(&nfsi->rwsem); 4496 if (do_vfs_lock(request->fl_file, request) == -ENOENT) { 4497 up_read(&nfsi->rwsem); 4498 goto out; 4499 } 4500 up_read(&nfsi->rwsem); 4501 if (status != 0) 4502 goto out; 4503 /* Is this a delegated lock? */ 4504 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) 4505 goto out; 4506 lsp = request->fl_u.nfs4_fl.owner; 4507 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 4508 status = -ENOMEM; 4509 if (seqid == NULL) 4510 goto out; 4511 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 4512 status = PTR_ERR(task); 4513 if (IS_ERR(task)) 4514 goto out; 4515 status = nfs4_wait_for_completion_rpc_task(task); 4516 rpc_put_task(task); 4517 out: 4518 request->fl_flags = fl_flags; 4519 return status; 4520 } 4521 4522 struct nfs4_lockdata { 4523 struct nfs_lock_args arg; 4524 struct nfs_lock_res res; 4525 struct nfs4_lock_state *lsp; 4526 struct nfs_open_context *ctx; 4527 struct file_lock fl; 4528 unsigned long timestamp; 4529 int rpc_status; 4530 int cancelled; 4531 struct nfs_server *server; 4532 }; 4533 4534 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 4535 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 4536 gfp_t gfp_mask) 4537 { 4538 struct nfs4_lockdata *p; 4539 struct inode *inode = lsp->ls_state->inode; 4540 struct nfs_server *server = NFS_SERVER(inode); 4541 4542 p = kzalloc(sizeof(*p), gfp_mask); 4543 if (p == NULL) 4544 return NULL; 4545 4546 p->arg.fh = NFS_FH(inode); 4547 p->arg.fl = &p->fl; 4548 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 4549 if (p->arg.open_seqid == NULL) 4550 goto out_free; 4551 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask); 4552 if (p->arg.lock_seqid == NULL) 4553 goto out_free_seqid; 4554 p->arg.lock_stateid = &lsp->ls_stateid; 4555 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 4556 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 4557 p->arg.lock_owner.s_dev = server->s_dev; 4558 p->res.lock_seqid = p->arg.lock_seqid; 4559 p->lsp = lsp; 4560 p->server = server; 4561 atomic_inc(&lsp->ls_count); 4562 p->ctx = get_nfs_open_context(ctx); 4563 memcpy(&p->fl, fl, sizeof(p->fl)); 4564 return p; 4565 out_free_seqid: 4566 nfs_free_seqid(p->arg.open_seqid); 4567 out_free: 4568 kfree(p); 4569 return NULL; 4570 } 4571 4572 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 4573 { 4574 struct nfs4_lockdata *data = calldata; 4575 struct nfs4_state *state = data->lsp->ls_state; 4576 4577 dprintk("%s: begin!\n", __func__); 4578 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 4579 return; 4580 /* Do we need to do an open_to_lock_owner? */ 4581 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 4582 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 4583 goto out_release_lock_seqid; 4584 } 4585 data->arg.open_stateid = &state->stateid; 4586 data->arg.new_lock_owner = 1; 4587 data->res.open_seqid = data->arg.open_seqid; 4588 } else 4589 data->arg.new_lock_owner = 0; 4590 data->timestamp = jiffies; 4591 if (nfs4_setup_sequence(data->server, 4592 &data->arg.seq_args, 4593 &data->res.seq_res, 4594 task) == 0) 4595 return; 4596 nfs_release_seqid(data->arg.open_seqid); 4597 out_release_lock_seqid: 4598 nfs_release_seqid(data->arg.lock_seqid); 4599 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 4600 } 4601 4602 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 4603 { 4604 struct nfs4_lockdata *data = calldata; 4605 4606 dprintk("%s: begin!\n", __func__); 4607 4608 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4609 return; 4610 4611 data->rpc_status = task->tk_status; 4612 if (data->arg.new_lock_owner != 0) { 4613 if (data->rpc_status == 0) 4614 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 4615 else 4616 goto out; 4617 } 4618 if (data->rpc_status == 0) { 4619 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid); 4620 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags); 4621 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); 4622 } 4623 out: 4624 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 4625 } 4626 4627 static void nfs4_lock_release(void *calldata) 4628 { 4629 struct nfs4_lockdata *data = calldata; 4630 4631 dprintk("%s: begin!\n", __func__); 4632 nfs_free_seqid(data->arg.open_seqid); 4633 if (data->cancelled != 0) { 4634 struct rpc_task *task; 4635 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 4636 data->arg.lock_seqid); 4637 if (!IS_ERR(task)) 4638 rpc_put_task_async(task); 4639 dprintk("%s: cancelling lock!\n", __func__); 4640 } else 4641 nfs_free_seqid(data->arg.lock_seqid); 4642 nfs4_put_lock_state(data->lsp); 4643 put_nfs_open_context(data->ctx); 4644 kfree(data); 4645 dprintk("%s: done!\n", __func__); 4646 } 4647 4648 static const struct rpc_call_ops nfs4_lock_ops = { 4649 .rpc_call_prepare = nfs4_lock_prepare, 4650 .rpc_call_done = nfs4_lock_done, 4651 .rpc_release = nfs4_lock_release, 4652 }; 4653 4654 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 4655 { 4656 switch (error) { 4657 case -NFS4ERR_ADMIN_REVOKED: 4658 case -NFS4ERR_BAD_STATEID: 4659 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 4660 if (new_lock_owner != 0 || 4661 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 4662 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 4663 break; 4664 case -NFS4ERR_STALE_STATEID: 4665 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 4666 case -NFS4ERR_EXPIRED: 4667 nfs4_schedule_lease_recovery(server->nfs_client); 4668 }; 4669 } 4670 4671 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 4672 { 4673 struct nfs4_lockdata *data; 4674 struct rpc_task *task; 4675 struct rpc_message msg = { 4676 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 4677 .rpc_cred = state->owner->so_cred, 4678 }; 4679 struct rpc_task_setup task_setup_data = { 4680 .rpc_client = NFS_CLIENT(state->inode), 4681 .rpc_message = &msg, 4682 .callback_ops = &nfs4_lock_ops, 4683 .workqueue = nfsiod_workqueue, 4684 .flags = RPC_TASK_ASYNC, 4685 }; 4686 int ret; 4687 4688 dprintk("%s: begin!\n", __func__); 4689 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 4690 fl->fl_u.nfs4_fl.owner, 4691 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 4692 if (data == NULL) 4693 return -ENOMEM; 4694 if (IS_SETLKW(cmd)) 4695 data->arg.block = 1; 4696 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 4697 msg.rpc_argp = &data->arg; 4698 msg.rpc_resp = &data->res; 4699 task_setup_data.callback_data = data; 4700 if (recovery_type > NFS_LOCK_NEW) { 4701 if (recovery_type == NFS_LOCK_RECLAIM) 4702 data->arg.reclaim = NFS_LOCK_RECLAIM; 4703 nfs4_set_sequence_privileged(&data->arg.seq_args); 4704 } 4705 task = rpc_run_task(&task_setup_data); 4706 if (IS_ERR(task)) 4707 return PTR_ERR(task); 4708 ret = nfs4_wait_for_completion_rpc_task(task); 4709 if (ret == 0) { 4710 ret = data->rpc_status; 4711 if (ret) 4712 nfs4_handle_setlk_error(data->server, data->lsp, 4713 data->arg.new_lock_owner, ret); 4714 } else 4715 data->cancelled = 1; 4716 rpc_put_task(task); 4717 dprintk("%s: done, ret = %d!\n", __func__, ret); 4718 return ret; 4719 } 4720 4721 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 4722 { 4723 struct nfs_server *server = NFS_SERVER(state->inode); 4724 struct nfs4_exception exception = { 4725 .inode = state->inode, 4726 }; 4727 int err; 4728 4729 do { 4730 /* Cache the lock if possible... */ 4731 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 4732 return 0; 4733 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 4734 if (err != -NFS4ERR_DELAY) 4735 break; 4736 nfs4_handle_exception(server, err, &exception); 4737 } while (exception.retry); 4738 return err; 4739 } 4740 4741 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 4742 { 4743 struct nfs_server *server = NFS_SERVER(state->inode); 4744 struct nfs4_exception exception = { 4745 .inode = state->inode, 4746 }; 4747 int err; 4748 4749 err = nfs4_set_lock_state(state, request); 4750 if (err != 0) 4751 return err; 4752 do { 4753 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 4754 return 0; 4755 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 4756 switch (err) { 4757 default: 4758 goto out; 4759 case -NFS4ERR_GRACE: 4760 case -NFS4ERR_DELAY: 4761 nfs4_handle_exception(server, err, &exception); 4762 err = 0; 4763 } 4764 } while (exception.retry); 4765 out: 4766 return err; 4767 } 4768 4769 #if defined(CONFIG_NFS_V4_1) 4770 /** 4771 * nfs41_check_expired_locks - possibly free a lock stateid 4772 * 4773 * @state: NFSv4 state for an inode 4774 * 4775 * Returns NFS_OK if recovery for this stateid is now finished. 4776 * Otherwise a negative NFS4ERR value is returned. 4777 */ 4778 static int nfs41_check_expired_locks(struct nfs4_state *state) 4779 { 4780 int status, ret = -NFS4ERR_BAD_STATEID; 4781 struct nfs4_lock_state *lsp; 4782 struct nfs_server *server = NFS_SERVER(state->inode); 4783 4784 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 4785 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 4786 status = nfs41_test_stateid(server, &lsp->ls_stateid); 4787 if (status != NFS_OK) { 4788 /* Free the stateid unless the server 4789 * informs us the stateid is unrecognized. */ 4790 if (status != -NFS4ERR_BAD_STATEID) 4791 nfs41_free_stateid(server, 4792 &lsp->ls_stateid); 4793 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 4794 ret = status; 4795 } 4796 } 4797 }; 4798 4799 return ret; 4800 } 4801 4802 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 4803 { 4804 int status = NFS_OK; 4805 4806 if (test_bit(LK_STATE_IN_USE, &state->flags)) 4807 status = nfs41_check_expired_locks(state); 4808 if (status != NFS_OK) 4809 status = nfs4_lock_expired(state, request); 4810 return status; 4811 } 4812 #endif 4813 4814 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4815 { 4816 struct nfs_inode *nfsi = NFS_I(state->inode); 4817 unsigned char fl_flags = request->fl_flags; 4818 int status = -ENOLCK; 4819 4820 if ((fl_flags & FL_POSIX) && 4821 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 4822 goto out; 4823 /* Is this a delegated open? */ 4824 status = nfs4_set_lock_state(state, request); 4825 if (status != 0) 4826 goto out; 4827 request->fl_flags |= FL_ACCESS; 4828 status = do_vfs_lock(request->fl_file, request); 4829 if (status < 0) 4830 goto out; 4831 down_read(&nfsi->rwsem); 4832 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 4833 /* Yes: cache locks! */ 4834 /* ...but avoid races with delegation recall... */ 4835 request->fl_flags = fl_flags & ~FL_SLEEP; 4836 status = do_vfs_lock(request->fl_file, request); 4837 goto out_unlock; 4838 } 4839 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 4840 if (status != 0) 4841 goto out_unlock; 4842 /* Note: we always want to sleep here! */ 4843 request->fl_flags = fl_flags | FL_SLEEP; 4844 if (do_vfs_lock(request->fl_file, request) < 0) 4845 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock " 4846 "manager!\n", __func__); 4847 out_unlock: 4848 up_read(&nfsi->rwsem); 4849 out: 4850 request->fl_flags = fl_flags; 4851 return status; 4852 } 4853 4854 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4855 { 4856 struct nfs4_exception exception = { 4857 .state = state, 4858 .inode = state->inode, 4859 }; 4860 int err; 4861 4862 do { 4863 err = _nfs4_proc_setlk(state, cmd, request); 4864 if (err == -NFS4ERR_DENIED) 4865 err = -EAGAIN; 4866 err = nfs4_handle_exception(NFS_SERVER(state->inode), 4867 err, &exception); 4868 } while (exception.retry); 4869 return err; 4870 } 4871 4872 static int 4873 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 4874 { 4875 struct nfs_open_context *ctx; 4876 struct nfs4_state *state; 4877 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 4878 int status; 4879 4880 /* verify open state */ 4881 ctx = nfs_file_open_context(filp); 4882 state = ctx->state; 4883 4884 if (request->fl_start < 0 || request->fl_end < 0) 4885 return -EINVAL; 4886 4887 if (IS_GETLK(cmd)) { 4888 if (state != NULL) 4889 return nfs4_proc_getlk(state, F_GETLK, request); 4890 return 0; 4891 } 4892 4893 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 4894 return -EINVAL; 4895 4896 if (request->fl_type == F_UNLCK) { 4897 if (state != NULL) 4898 return nfs4_proc_unlck(state, cmd, request); 4899 return 0; 4900 } 4901 4902 if (state == NULL) 4903 return -ENOLCK; 4904 /* 4905 * Don't rely on the VFS having checked the file open mode, 4906 * since it won't do this for flock() locks. 4907 */ 4908 switch (request->fl_type) { 4909 case F_RDLCK: 4910 if (!(filp->f_mode & FMODE_READ)) 4911 return -EBADF; 4912 break; 4913 case F_WRLCK: 4914 if (!(filp->f_mode & FMODE_WRITE)) 4915 return -EBADF; 4916 } 4917 4918 do { 4919 status = nfs4_proc_setlk(state, cmd, request); 4920 if ((status != -EAGAIN) || IS_SETLK(cmd)) 4921 break; 4922 timeout = nfs4_set_lock_task_retry(timeout); 4923 status = -ERESTARTSYS; 4924 if (signalled()) 4925 break; 4926 } while(status < 0); 4927 return status; 4928 } 4929 4930 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) 4931 { 4932 struct nfs_server *server = NFS_SERVER(state->inode); 4933 struct nfs4_exception exception = { }; 4934 int err; 4935 4936 err = nfs4_set_lock_state(state, fl); 4937 if (err != 0) 4938 goto out; 4939 do { 4940 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 4941 switch (err) { 4942 default: 4943 printk(KERN_ERR "NFS: %s: unhandled error " 4944 "%d.\n", __func__, err); 4945 case 0: 4946 case -ESTALE: 4947 goto out; 4948 case -NFS4ERR_EXPIRED: 4949 nfs4_schedule_stateid_recovery(server, state); 4950 case -NFS4ERR_STALE_CLIENTID: 4951 case -NFS4ERR_STALE_STATEID: 4952 nfs4_schedule_lease_recovery(server->nfs_client); 4953 goto out; 4954 case -NFS4ERR_BADSESSION: 4955 case -NFS4ERR_BADSLOT: 4956 case -NFS4ERR_BAD_HIGH_SLOT: 4957 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 4958 case -NFS4ERR_DEADSESSION: 4959 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 4960 goto out; 4961 case -ERESTARTSYS: 4962 /* 4963 * The show must go on: exit, but mark the 4964 * stateid as needing recovery. 4965 */ 4966 case -NFS4ERR_DELEG_REVOKED: 4967 case -NFS4ERR_ADMIN_REVOKED: 4968 case -NFS4ERR_BAD_STATEID: 4969 case -NFS4ERR_OPENMODE: 4970 nfs4_schedule_stateid_recovery(server, state); 4971 err = 0; 4972 goto out; 4973 case -ENOMEM: 4974 case -NFS4ERR_DENIED: 4975 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 4976 err = 0; 4977 goto out; 4978 case -NFS4ERR_DELAY: 4979 break; 4980 } 4981 err = nfs4_handle_exception(server, err, &exception); 4982 } while (exception.retry); 4983 out: 4984 return err; 4985 } 4986 4987 struct nfs_release_lockowner_data { 4988 struct nfs4_lock_state *lsp; 4989 struct nfs_server *server; 4990 struct nfs_release_lockowner_args args; 4991 }; 4992 4993 static void nfs4_release_lockowner_release(void *calldata) 4994 { 4995 struct nfs_release_lockowner_data *data = calldata; 4996 nfs4_free_lock_state(data->server, data->lsp); 4997 kfree(calldata); 4998 } 4999 5000 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 5001 .rpc_release = nfs4_release_lockowner_release, 5002 }; 5003 5004 int nfs4_release_lockowner(struct nfs4_lock_state *lsp) 5005 { 5006 struct nfs_server *server = lsp->ls_state->owner->so_server; 5007 struct nfs_release_lockowner_data *data; 5008 struct rpc_message msg = { 5009 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 5010 }; 5011 5012 if (server->nfs_client->cl_mvops->minor_version != 0) 5013 return -EINVAL; 5014 data = kmalloc(sizeof(*data), GFP_NOFS); 5015 if (!data) 5016 return -ENOMEM; 5017 data->lsp = lsp; 5018 data->server = server; 5019 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 5020 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 5021 data->args.lock_owner.s_dev = server->s_dev; 5022 msg.rpc_argp = &data->args; 5023 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 5024 return 0; 5025 } 5026 5027 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 5028 5029 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key, 5030 const void *buf, size_t buflen, 5031 int flags, int type) 5032 { 5033 if (strcmp(key, "") != 0) 5034 return -EINVAL; 5035 5036 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen); 5037 } 5038 5039 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key, 5040 void *buf, size_t buflen, int type) 5041 { 5042 if (strcmp(key, "") != 0) 5043 return -EINVAL; 5044 5045 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen); 5046 } 5047 5048 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list, 5049 size_t list_len, const char *name, 5050 size_t name_len, int type) 5051 { 5052 size_t len = sizeof(XATTR_NAME_NFSV4_ACL); 5053 5054 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 5055 return 0; 5056 5057 if (list && len <= list_len) 5058 memcpy(list, XATTR_NAME_NFSV4_ACL, len); 5059 return len; 5060 } 5061 5062 /* 5063 * nfs_fhget will use either the mounted_on_fileid or the fileid 5064 */ 5065 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 5066 { 5067 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 5068 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 5069 (fattr->valid & NFS_ATTR_FATTR_FSID) && 5070 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 5071 return; 5072 5073 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 5074 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 5075 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 5076 fattr->nlink = 2; 5077 } 5078 5079 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 5080 const struct qstr *name, 5081 struct nfs4_fs_locations *fs_locations, 5082 struct page *page) 5083 { 5084 struct nfs_server *server = NFS_SERVER(dir); 5085 u32 bitmask[2] = { 5086 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 5087 }; 5088 struct nfs4_fs_locations_arg args = { 5089 .dir_fh = NFS_FH(dir), 5090 .name = name, 5091 .page = page, 5092 .bitmask = bitmask, 5093 }; 5094 struct nfs4_fs_locations_res res = { 5095 .fs_locations = fs_locations, 5096 }; 5097 struct rpc_message msg = { 5098 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 5099 .rpc_argp = &args, 5100 .rpc_resp = &res, 5101 }; 5102 int status; 5103 5104 dprintk("%s: start\n", __func__); 5105 5106 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 5107 * is not supported */ 5108 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 5109 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 5110 else 5111 bitmask[0] |= FATTR4_WORD0_FILEID; 5112 5113 nfs_fattr_init(&fs_locations->fattr); 5114 fs_locations->server = server; 5115 fs_locations->nlocations = 0; 5116 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 5117 dprintk("%s: returned status = %d\n", __func__, status); 5118 return status; 5119 } 5120 5121 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 5122 const struct qstr *name, 5123 struct nfs4_fs_locations *fs_locations, 5124 struct page *page) 5125 { 5126 struct nfs4_exception exception = { }; 5127 int err; 5128 do { 5129 err = nfs4_handle_exception(NFS_SERVER(dir), 5130 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page), 5131 &exception); 5132 } while (exception.retry); 5133 return err; 5134 } 5135 5136 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors) 5137 { 5138 int status; 5139 struct nfs4_secinfo_arg args = { 5140 .dir_fh = NFS_FH(dir), 5141 .name = name, 5142 }; 5143 struct nfs4_secinfo_res res = { 5144 .flavors = flavors, 5145 }; 5146 struct rpc_message msg = { 5147 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 5148 .rpc_argp = &args, 5149 .rpc_resp = &res, 5150 }; 5151 5152 dprintk("NFS call secinfo %s\n", name->name); 5153 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 5154 dprintk("NFS reply secinfo: %d\n", status); 5155 return status; 5156 } 5157 5158 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 5159 struct nfs4_secinfo_flavors *flavors) 5160 { 5161 struct nfs4_exception exception = { }; 5162 int err; 5163 do { 5164 err = nfs4_handle_exception(NFS_SERVER(dir), 5165 _nfs4_proc_secinfo(dir, name, flavors), 5166 &exception); 5167 } while (exception.retry); 5168 return err; 5169 } 5170 5171 #ifdef CONFIG_NFS_V4_1 5172 /* 5173 * Check the exchange flags returned by the server for invalid flags, having 5174 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 5175 * DS flags set. 5176 */ 5177 static int nfs4_check_cl_exchange_flags(u32 flags) 5178 { 5179 if (flags & ~EXCHGID4_FLAG_MASK_R) 5180 goto out_inval; 5181 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 5182 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 5183 goto out_inval; 5184 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 5185 goto out_inval; 5186 return NFS_OK; 5187 out_inval: 5188 return -NFS4ERR_INVAL; 5189 } 5190 5191 static bool 5192 nfs41_same_server_scope(struct nfs41_server_scope *a, 5193 struct nfs41_server_scope *b) 5194 { 5195 if (a->server_scope_sz == b->server_scope_sz && 5196 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 5197 return true; 5198 5199 return false; 5200 } 5201 5202 /* 5203 * nfs4_proc_bind_conn_to_session() 5204 * 5205 * The 4.1 client currently uses the same TCP connection for the 5206 * fore and backchannel. 5207 */ 5208 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 5209 { 5210 int status; 5211 struct nfs41_bind_conn_to_session_res res; 5212 struct rpc_message msg = { 5213 .rpc_proc = 5214 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 5215 .rpc_argp = clp, 5216 .rpc_resp = &res, 5217 .rpc_cred = cred, 5218 }; 5219 5220 dprintk("--> %s\n", __func__); 5221 5222 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS); 5223 if (unlikely(res.session == NULL)) { 5224 status = -ENOMEM; 5225 goto out; 5226 } 5227 5228 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5229 if (status == 0) { 5230 if (memcmp(res.session->sess_id.data, 5231 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 5232 dprintk("NFS: %s: Session ID mismatch\n", __func__); 5233 status = -EIO; 5234 goto out_session; 5235 } 5236 if (res.dir != NFS4_CDFS4_BOTH) { 5237 dprintk("NFS: %s: Unexpected direction from server\n", 5238 __func__); 5239 status = -EIO; 5240 goto out_session; 5241 } 5242 if (res.use_conn_in_rdma_mode) { 5243 dprintk("NFS: %s: Server returned RDMA mode = true\n", 5244 __func__); 5245 status = -EIO; 5246 goto out_session; 5247 } 5248 } 5249 out_session: 5250 kfree(res.session); 5251 out: 5252 dprintk("<-- %s status= %d\n", __func__, status); 5253 return status; 5254 } 5255 5256 /* 5257 * nfs4_proc_exchange_id() 5258 * 5259 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5260 * 5261 * Since the clientid has expired, all compounds using sessions 5262 * associated with the stale clientid will be returning 5263 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 5264 * be in some phase of session reset. 5265 */ 5266 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 5267 { 5268 nfs4_verifier verifier; 5269 struct nfs41_exchange_id_args args = { 5270 .verifier = &verifier, 5271 .client = clp, 5272 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER, 5273 }; 5274 struct nfs41_exchange_id_res res = { 5275 0 5276 }; 5277 int status; 5278 struct rpc_message msg = { 5279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 5280 .rpc_argp = &args, 5281 .rpc_resp = &res, 5282 .rpc_cred = cred, 5283 }; 5284 5285 nfs4_init_boot_verifier(clp, &verifier); 5286 args.id_len = nfs4_init_uniform_client_string(clp, args.id, 5287 sizeof(args.id)); 5288 dprintk("NFS call exchange_id auth=%s, '%.*s'\n", 5289 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5290 args.id_len, args.id); 5291 5292 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 5293 GFP_NOFS); 5294 if (unlikely(res.server_owner == NULL)) { 5295 status = -ENOMEM; 5296 goto out; 5297 } 5298 5299 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 5300 GFP_NOFS); 5301 if (unlikely(res.server_scope == NULL)) { 5302 status = -ENOMEM; 5303 goto out_server_owner; 5304 } 5305 5306 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 5307 if (unlikely(res.impl_id == NULL)) { 5308 status = -ENOMEM; 5309 goto out_server_scope; 5310 } 5311 5312 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5313 if (status == 0) 5314 status = nfs4_check_cl_exchange_flags(res.flags); 5315 5316 if (status == 0) { 5317 clp->cl_clientid = res.clientid; 5318 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R); 5319 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) 5320 clp->cl_seqid = res.seqid; 5321 5322 kfree(clp->cl_serverowner); 5323 clp->cl_serverowner = res.server_owner; 5324 res.server_owner = NULL; 5325 5326 /* use the most recent implementation id */ 5327 kfree(clp->cl_implid); 5328 clp->cl_implid = res.impl_id; 5329 5330 if (clp->cl_serverscope != NULL && 5331 !nfs41_same_server_scope(clp->cl_serverscope, 5332 res.server_scope)) { 5333 dprintk("%s: server_scope mismatch detected\n", 5334 __func__); 5335 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 5336 kfree(clp->cl_serverscope); 5337 clp->cl_serverscope = NULL; 5338 } 5339 5340 if (clp->cl_serverscope == NULL) { 5341 clp->cl_serverscope = res.server_scope; 5342 goto out; 5343 } 5344 } else 5345 kfree(res.impl_id); 5346 5347 out_server_owner: 5348 kfree(res.server_owner); 5349 out_server_scope: 5350 kfree(res.server_scope); 5351 out: 5352 if (clp->cl_implid != NULL) 5353 dprintk("NFS reply exchange_id: Server Implementation ID: " 5354 "domain: %s, name: %s, date: %llu,%u\n", 5355 clp->cl_implid->domain, clp->cl_implid->name, 5356 clp->cl_implid->date.seconds, 5357 clp->cl_implid->date.nseconds); 5358 dprintk("NFS reply exchange_id: %d\n", status); 5359 return status; 5360 } 5361 5362 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 5363 struct rpc_cred *cred) 5364 { 5365 struct rpc_message msg = { 5366 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 5367 .rpc_argp = clp, 5368 .rpc_cred = cred, 5369 }; 5370 int status; 5371 5372 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5373 if (status) 5374 dprintk("NFS: Got error %d from the server %s on " 5375 "DESTROY_CLIENTID.", status, clp->cl_hostname); 5376 return status; 5377 } 5378 5379 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 5380 struct rpc_cred *cred) 5381 { 5382 unsigned int loop; 5383 int ret; 5384 5385 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 5386 ret = _nfs4_proc_destroy_clientid(clp, cred); 5387 switch (ret) { 5388 case -NFS4ERR_DELAY: 5389 case -NFS4ERR_CLIENTID_BUSY: 5390 ssleep(1); 5391 break; 5392 default: 5393 return ret; 5394 } 5395 } 5396 return 0; 5397 } 5398 5399 int nfs4_destroy_clientid(struct nfs_client *clp) 5400 { 5401 struct rpc_cred *cred; 5402 int ret = 0; 5403 5404 if (clp->cl_mvops->minor_version < 1) 5405 goto out; 5406 if (clp->cl_exchange_flags == 0) 5407 goto out; 5408 if (clp->cl_preserve_clid) 5409 goto out; 5410 cred = nfs4_get_exchange_id_cred(clp); 5411 ret = nfs4_proc_destroy_clientid(clp, cred); 5412 if (cred) 5413 put_rpccred(cred); 5414 switch (ret) { 5415 case 0: 5416 case -NFS4ERR_STALE_CLIENTID: 5417 clp->cl_exchange_flags = 0; 5418 } 5419 out: 5420 return ret; 5421 } 5422 5423 struct nfs4_get_lease_time_data { 5424 struct nfs4_get_lease_time_args *args; 5425 struct nfs4_get_lease_time_res *res; 5426 struct nfs_client *clp; 5427 }; 5428 5429 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 5430 void *calldata) 5431 { 5432 struct nfs4_get_lease_time_data *data = 5433 (struct nfs4_get_lease_time_data *)calldata; 5434 5435 dprintk("--> %s\n", __func__); 5436 /* just setup sequence, do not trigger session recovery 5437 since we're invoked within one */ 5438 nfs41_setup_sequence(data->clp->cl_session, 5439 &data->args->la_seq_args, 5440 &data->res->lr_seq_res, 5441 task); 5442 dprintk("<-- %s\n", __func__); 5443 } 5444 5445 /* 5446 * Called from nfs4_state_manager thread for session setup, so don't recover 5447 * from sequence operation or clientid errors. 5448 */ 5449 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 5450 { 5451 struct nfs4_get_lease_time_data *data = 5452 (struct nfs4_get_lease_time_data *)calldata; 5453 5454 dprintk("--> %s\n", __func__); 5455 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 5456 return; 5457 switch (task->tk_status) { 5458 case -NFS4ERR_DELAY: 5459 case -NFS4ERR_GRACE: 5460 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 5461 rpc_delay(task, NFS4_POLL_RETRY_MIN); 5462 task->tk_status = 0; 5463 /* fall through */ 5464 case -NFS4ERR_RETRY_UNCACHED_REP: 5465 rpc_restart_call_prepare(task); 5466 return; 5467 } 5468 dprintk("<-- %s\n", __func__); 5469 } 5470 5471 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 5472 .rpc_call_prepare = nfs4_get_lease_time_prepare, 5473 .rpc_call_done = nfs4_get_lease_time_done, 5474 }; 5475 5476 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 5477 { 5478 struct rpc_task *task; 5479 struct nfs4_get_lease_time_args args; 5480 struct nfs4_get_lease_time_res res = { 5481 .lr_fsinfo = fsinfo, 5482 }; 5483 struct nfs4_get_lease_time_data data = { 5484 .args = &args, 5485 .res = &res, 5486 .clp = clp, 5487 }; 5488 struct rpc_message msg = { 5489 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 5490 .rpc_argp = &args, 5491 .rpc_resp = &res, 5492 }; 5493 struct rpc_task_setup task_setup = { 5494 .rpc_client = clp->cl_rpcclient, 5495 .rpc_message = &msg, 5496 .callback_ops = &nfs4_get_lease_time_ops, 5497 .callback_data = &data, 5498 .flags = RPC_TASK_TIMEOUT, 5499 }; 5500 int status; 5501 5502 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 5503 nfs4_set_sequence_privileged(&args.la_seq_args); 5504 dprintk("--> %s\n", __func__); 5505 task = rpc_run_task(&task_setup); 5506 5507 if (IS_ERR(task)) 5508 status = PTR_ERR(task); 5509 else { 5510 status = task->tk_status; 5511 rpc_put_task(task); 5512 } 5513 dprintk("<-- %s return %d\n", __func__, status); 5514 5515 return status; 5516 } 5517 5518 /* 5519 * Initialize the values to be used by the client in CREATE_SESSION 5520 * If nfs4_init_session set the fore channel request and response sizes, 5521 * use them. 5522 * 5523 * Set the back channel max_resp_sz_cached to zero to force the client to 5524 * always set csa_cachethis to FALSE because the current implementation 5525 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 5526 */ 5527 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 5528 { 5529 struct nfs4_session *session = args->client->cl_session; 5530 unsigned int mxrqst_sz = session->fc_target_max_rqst_sz, 5531 mxresp_sz = session->fc_target_max_resp_sz; 5532 5533 if (mxrqst_sz == 0) 5534 mxrqst_sz = NFS_MAX_FILE_IO_SIZE; 5535 if (mxresp_sz == 0) 5536 mxresp_sz = NFS_MAX_FILE_IO_SIZE; 5537 /* Fore channel attributes */ 5538 args->fc_attrs.max_rqst_sz = mxrqst_sz; 5539 args->fc_attrs.max_resp_sz = mxresp_sz; 5540 args->fc_attrs.max_ops = NFS4_MAX_OPS; 5541 args->fc_attrs.max_reqs = max_session_slots; 5542 5543 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 5544 "max_ops=%u max_reqs=%u\n", 5545 __func__, 5546 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 5547 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 5548 5549 /* Back channel attributes */ 5550 args->bc_attrs.max_rqst_sz = PAGE_SIZE; 5551 args->bc_attrs.max_resp_sz = PAGE_SIZE; 5552 args->bc_attrs.max_resp_sz_cached = 0; 5553 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 5554 args->bc_attrs.max_reqs = 1; 5555 5556 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 5557 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 5558 __func__, 5559 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 5560 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 5561 args->bc_attrs.max_reqs); 5562 } 5563 5564 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 5565 { 5566 struct nfs4_channel_attrs *sent = &args->fc_attrs; 5567 struct nfs4_channel_attrs *rcvd = &session->fc_attrs; 5568 5569 if (rcvd->max_resp_sz > sent->max_resp_sz) 5570 return -EINVAL; 5571 /* 5572 * Our requested max_ops is the minimum we need; we're not 5573 * prepared to break up compounds into smaller pieces than that. 5574 * So, no point even trying to continue if the server won't 5575 * cooperate: 5576 */ 5577 if (rcvd->max_ops < sent->max_ops) 5578 return -EINVAL; 5579 if (rcvd->max_reqs == 0) 5580 return -EINVAL; 5581 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 5582 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 5583 return 0; 5584 } 5585 5586 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 5587 { 5588 struct nfs4_channel_attrs *sent = &args->bc_attrs; 5589 struct nfs4_channel_attrs *rcvd = &session->bc_attrs; 5590 5591 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 5592 return -EINVAL; 5593 if (rcvd->max_resp_sz < sent->max_resp_sz) 5594 return -EINVAL; 5595 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 5596 return -EINVAL; 5597 /* These would render the backchannel useless: */ 5598 if (rcvd->max_ops != sent->max_ops) 5599 return -EINVAL; 5600 if (rcvd->max_reqs != sent->max_reqs) 5601 return -EINVAL; 5602 return 0; 5603 } 5604 5605 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 5606 struct nfs4_session *session) 5607 { 5608 int ret; 5609 5610 ret = nfs4_verify_fore_channel_attrs(args, session); 5611 if (ret) 5612 return ret; 5613 return nfs4_verify_back_channel_attrs(args, session); 5614 } 5615 5616 static int _nfs4_proc_create_session(struct nfs_client *clp, 5617 struct rpc_cred *cred) 5618 { 5619 struct nfs4_session *session = clp->cl_session; 5620 struct nfs41_create_session_args args = { 5621 .client = clp, 5622 .cb_program = NFS4_CALLBACK, 5623 }; 5624 struct nfs41_create_session_res res = { 5625 .client = clp, 5626 }; 5627 struct rpc_message msg = { 5628 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 5629 .rpc_argp = &args, 5630 .rpc_resp = &res, 5631 .rpc_cred = cred, 5632 }; 5633 int status; 5634 5635 nfs4_init_channel_attrs(&args); 5636 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 5637 5638 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5639 5640 if (!status) { 5641 /* Verify the session's negotiated channel_attrs values */ 5642 status = nfs4_verify_channel_attrs(&args, session); 5643 /* Increment the clientid slot sequence id */ 5644 clp->cl_seqid++; 5645 } 5646 5647 return status; 5648 } 5649 5650 /* 5651 * Issues a CREATE_SESSION operation to the server. 5652 * It is the responsibility of the caller to verify the session is 5653 * expired before calling this routine. 5654 */ 5655 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 5656 { 5657 int status; 5658 unsigned *ptr; 5659 struct nfs4_session *session = clp->cl_session; 5660 5661 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 5662 5663 status = _nfs4_proc_create_session(clp, cred); 5664 if (status) 5665 goto out; 5666 5667 /* Init or reset the session slot tables */ 5668 status = nfs4_setup_session_slot_tables(session); 5669 dprintk("slot table setup returned %d\n", status); 5670 if (status) 5671 goto out; 5672 5673 ptr = (unsigned *)&session->sess_id.data[0]; 5674 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 5675 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 5676 out: 5677 dprintk("<-- %s\n", __func__); 5678 return status; 5679 } 5680 5681 /* 5682 * Issue the over-the-wire RPC DESTROY_SESSION. 5683 * The caller must serialize access to this routine. 5684 */ 5685 int nfs4_proc_destroy_session(struct nfs4_session *session, 5686 struct rpc_cred *cred) 5687 { 5688 struct rpc_message msg = { 5689 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 5690 .rpc_argp = session, 5691 .rpc_cred = cred, 5692 }; 5693 int status = 0; 5694 5695 dprintk("--> nfs4_proc_destroy_session\n"); 5696 5697 /* session is still being setup */ 5698 if (session->clp->cl_cons_state != NFS_CS_READY) 5699 return status; 5700 5701 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5702 5703 if (status) 5704 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 5705 "Session has been destroyed regardless...\n", status); 5706 5707 dprintk("<-- nfs4_proc_destroy_session\n"); 5708 return status; 5709 } 5710 5711 /* 5712 * Renew the cl_session lease. 5713 */ 5714 struct nfs4_sequence_data { 5715 struct nfs_client *clp; 5716 struct nfs4_sequence_args args; 5717 struct nfs4_sequence_res res; 5718 }; 5719 5720 static void nfs41_sequence_release(void *data) 5721 { 5722 struct nfs4_sequence_data *calldata = data; 5723 struct nfs_client *clp = calldata->clp; 5724 5725 if (atomic_read(&clp->cl_count) > 1) 5726 nfs4_schedule_state_renewal(clp); 5727 nfs_put_client(clp); 5728 kfree(calldata); 5729 } 5730 5731 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 5732 { 5733 switch(task->tk_status) { 5734 case -NFS4ERR_DELAY: 5735 rpc_delay(task, NFS4_POLL_RETRY_MAX); 5736 return -EAGAIN; 5737 default: 5738 nfs4_schedule_lease_recovery(clp); 5739 } 5740 return 0; 5741 } 5742 5743 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 5744 { 5745 struct nfs4_sequence_data *calldata = data; 5746 struct nfs_client *clp = calldata->clp; 5747 5748 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 5749 return; 5750 5751 if (task->tk_status < 0) { 5752 dprintk("%s ERROR %d\n", __func__, task->tk_status); 5753 if (atomic_read(&clp->cl_count) == 1) 5754 goto out; 5755 5756 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 5757 rpc_restart_call_prepare(task); 5758 return; 5759 } 5760 } 5761 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 5762 out: 5763 dprintk("<-- %s\n", __func__); 5764 } 5765 5766 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 5767 { 5768 struct nfs4_sequence_data *calldata = data; 5769 struct nfs_client *clp = calldata->clp; 5770 struct nfs4_sequence_args *args; 5771 struct nfs4_sequence_res *res; 5772 5773 args = task->tk_msg.rpc_argp; 5774 res = task->tk_msg.rpc_resp; 5775 5776 nfs41_setup_sequence(clp->cl_session, args, res, task); 5777 } 5778 5779 static const struct rpc_call_ops nfs41_sequence_ops = { 5780 .rpc_call_done = nfs41_sequence_call_done, 5781 .rpc_call_prepare = nfs41_sequence_prepare, 5782 .rpc_release = nfs41_sequence_release, 5783 }; 5784 5785 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 5786 struct rpc_cred *cred, 5787 bool is_privileged) 5788 { 5789 struct nfs4_sequence_data *calldata; 5790 struct rpc_message msg = { 5791 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 5792 .rpc_cred = cred, 5793 }; 5794 struct rpc_task_setup task_setup_data = { 5795 .rpc_client = clp->cl_rpcclient, 5796 .rpc_message = &msg, 5797 .callback_ops = &nfs41_sequence_ops, 5798 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT, 5799 }; 5800 5801 if (!atomic_inc_not_zero(&clp->cl_count)) 5802 return ERR_PTR(-EIO); 5803 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 5804 if (calldata == NULL) { 5805 nfs_put_client(clp); 5806 return ERR_PTR(-ENOMEM); 5807 } 5808 nfs41_init_sequence(&calldata->args, &calldata->res, 0); 5809 if (is_privileged) 5810 nfs4_set_sequence_privileged(&calldata->args); 5811 msg.rpc_argp = &calldata->args; 5812 msg.rpc_resp = &calldata->res; 5813 calldata->clp = clp; 5814 task_setup_data.callback_data = calldata; 5815 5816 return rpc_run_task(&task_setup_data); 5817 } 5818 5819 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 5820 { 5821 struct rpc_task *task; 5822 int ret = 0; 5823 5824 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 5825 return 0; 5826 task = _nfs41_proc_sequence(clp, cred, false); 5827 if (IS_ERR(task)) 5828 ret = PTR_ERR(task); 5829 else 5830 rpc_put_task_async(task); 5831 dprintk("<-- %s status=%d\n", __func__, ret); 5832 return ret; 5833 } 5834 5835 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 5836 { 5837 struct rpc_task *task; 5838 int ret; 5839 5840 task = _nfs41_proc_sequence(clp, cred, true); 5841 if (IS_ERR(task)) { 5842 ret = PTR_ERR(task); 5843 goto out; 5844 } 5845 ret = rpc_wait_for_completion_task(task); 5846 if (!ret) { 5847 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp; 5848 5849 if (task->tk_status == 0) 5850 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 5851 ret = task->tk_status; 5852 } 5853 rpc_put_task(task); 5854 out: 5855 dprintk("<-- %s status=%d\n", __func__, ret); 5856 return ret; 5857 } 5858 5859 struct nfs4_reclaim_complete_data { 5860 struct nfs_client *clp; 5861 struct nfs41_reclaim_complete_args arg; 5862 struct nfs41_reclaim_complete_res res; 5863 }; 5864 5865 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 5866 { 5867 struct nfs4_reclaim_complete_data *calldata = data; 5868 5869 nfs41_setup_sequence(calldata->clp->cl_session, 5870 &calldata->arg.seq_args, 5871 &calldata->res.seq_res, 5872 task); 5873 } 5874 5875 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 5876 { 5877 switch(task->tk_status) { 5878 case 0: 5879 case -NFS4ERR_COMPLETE_ALREADY: 5880 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 5881 break; 5882 case -NFS4ERR_DELAY: 5883 rpc_delay(task, NFS4_POLL_RETRY_MAX); 5884 /* fall through */ 5885 case -NFS4ERR_RETRY_UNCACHED_REP: 5886 return -EAGAIN; 5887 default: 5888 nfs4_schedule_lease_recovery(clp); 5889 } 5890 return 0; 5891 } 5892 5893 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 5894 { 5895 struct nfs4_reclaim_complete_data *calldata = data; 5896 struct nfs_client *clp = calldata->clp; 5897 struct nfs4_sequence_res *res = &calldata->res.seq_res; 5898 5899 dprintk("--> %s\n", __func__); 5900 if (!nfs41_sequence_done(task, res)) 5901 return; 5902 5903 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 5904 rpc_restart_call_prepare(task); 5905 return; 5906 } 5907 dprintk("<-- %s\n", __func__); 5908 } 5909 5910 static void nfs4_free_reclaim_complete_data(void *data) 5911 { 5912 struct nfs4_reclaim_complete_data *calldata = data; 5913 5914 kfree(calldata); 5915 } 5916 5917 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 5918 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 5919 .rpc_call_done = nfs4_reclaim_complete_done, 5920 .rpc_release = nfs4_free_reclaim_complete_data, 5921 }; 5922 5923 /* 5924 * Issue a global reclaim complete. 5925 */ 5926 static int nfs41_proc_reclaim_complete(struct nfs_client *clp) 5927 { 5928 struct nfs4_reclaim_complete_data *calldata; 5929 struct rpc_task *task; 5930 struct rpc_message msg = { 5931 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 5932 }; 5933 struct rpc_task_setup task_setup_data = { 5934 .rpc_client = clp->cl_rpcclient, 5935 .rpc_message = &msg, 5936 .callback_ops = &nfs4_reclaim_complete_call_ops, 5937 .flags = RPC_TASK_ASYNC, 5938 }; 5939 int status = -ENOMEM; 5940 5941 dprintk("--> %s\n", __func__); 5942 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 5943 if (calldata == NULL) 5944 goto out; 5945 calldata->clp = clp; 5946 calldata->arg.one_fs = 0; 5947 5948 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 5949 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 5950 msg.rpc_argp = &calldata->arg; 5951 msg.rpc_resp = &calldata->res; 5952 task_setup_data.callback_data = calldata; 5953 task = rpc_run_task(&task_setup_data); 5954 if (IS_ERR(task)) { 5955 status = PTR_ERR(task); 5956 goto out; 5957 } 5958 status = nfs4_wait_for_completion_rpc_task(task); 5959 if (status == 0) 5960 status = task->tk_status; 5961 rpc_put_task(task); 5962 return 0; 5963 out: 5964 dprintk("<-- %s status=%d\n", __func__, status); 5965 return status; 5966 } 5967 5968 static void 5969 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 5970 { 5971 struct nfs4_layoutget *lgp = calldata; 5972 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 5973 struct nfs4_session *session = nfs4_get_session(server); 5974 5975 dprintk("--> %s\n", __func__); 5976 /* Note the is a race here, where a CB_LAYOUTRECALL can come in 5977 * right now covering the LAYOUTGET we are about to send. 5978 * However, that is not so catastrophic, and there seems 5979 * to be no way to prevent it completely. 5980 */ 5981 if (nfs41_setup_sequence(session, &lgp->args.seq_args, 5982 &lgp->res.seq_res, task)) 5983 return; 5984 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid, 5985 NFS_I(lgp->args.inode)->layout, 5986 lgp->args.ctx->state)) { 5987 rpc_exit(task, NFS4_OK); 5988 } 5989 } 5990 5991 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 5992 { 5993 struct nfs4_layoutget *lgp = calldata; 5994 struct inode *inode = lgp->args.inode; 5995 struct nfs_server *server = NFS_SERVER(inode); 5996 struct pnfs_layout_hdr *lo; 5997 struct nfs4_state *state = NULL; 5998 5999 dprintk("--> %s\n", __func__); 6000 6001 if (!nfs41_sequence_done(task, &lgp->res.seq_res)) 6002 goto out; 6003 6004 switch (task->tk_status) { 6005 case 0: 6006 goto out; 6007 case -NFS4ERR_LAYOUTTRYLATER: 6008 case -NFS4ERR_RECALLCONFLICT: 6009 task->tk_status = -NFS4ERR_DELAY; 6010 break; 6011 case -NFS4ERR_EXPIRED: 6012 case -NFS4ERR_BAD_STATEID: 6013 spin_lock(&inode->i_lock); 6014 lo = NFS_I(inode)->layout; 6015 if (!lo || list_empty(&lo->plh_segs)) { 6016 spin_unlock(&inode->i_lock); 6017 /* If the open stateid was bad, then recover it. */ 6018 state = lgp->args.ctx->state; 6019 } else { 6020 LIST_HEAD(head); 6021 6022 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL); 6023 spin_unlock(&inode->i_lock); 6024 /* Mark the bad layout state as invalid, then 6025 * retry using the open stateid. */ 6026 pnfs_free_lseg_list(&head); 6027 } 6028 } 6029 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) 6030 rpc_restart_call_prepare(task); 6031 out: 6032 dprintk("<-- %s\n", __func__); 6033 } 6034 6035 static size_t max_response_pages(struct nfs_server *server) 6036 { 6037 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 6038 return nfs_page_array_len(0, max_resp_sz); 6039 } 6040 6041 static void nfs4_free_pages(struct page **pages, size_t size) 6042 { 6043 int i; 6044 6045 if (!pages) 6046 return; 6047 6048 for (i = 0; i < size; i++) { 6049 if (!pages[i]) 6050 break; 6051 __free_page(pages[i]); 6052 } 6053 kfree(pages); 6054 } 6055 6056 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 6057 { 6058 struct page **pages; 6059 int i; 6060 6061 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 6062 if (!pages) { 6063 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 6064 return NULL; 6065 } 6066 6067 for (i = 0; i < size; i++) { 6068 pages[i] = alloc_page(gfp_flags); 6069 if (!pages[i]) { 6070 dprintk("%s: failed to allocate page\n", __func__); 6071 nfs4_free_pages(pages, size); 6072 return NULL; 6073 } 6074 } 6075 6076 return pages; 6077 } 6078 6079 static void nfs4_layoutget_release(void *calldata) 6080 { 6081 struct nfs4_layoutget *lgp = calldata; 6082 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 6083 size_t max_pages = max_response_pages(server); 6084 6085 dprintk("--> %s\n", __func__); 6086 nfs4_free_pages(lgp->args.layout.pages, max_pages); 6087 put_nfs_open_context(lgp->args.ctx); 6088 kfree(calldata); 6089 dprintk("<-- %s\n", __func__); 6090 } 6091 6092 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 6093 .rpc_call_prepare = nfs4_layoutget_prepare, 6094 .rpc_call_done = nfs4_layoutget_done, 6095 .rpc_release = nfs4_layoutget_release, 6096 }; 6097 6098 struct pnfs_layout_segment * 6099 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) 6100 { 6101 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 6102 size_t max_pages = max_response_pages(server); 6103 struct rpc_task *task; 6104 struct rpc_message msg = { 6105 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 6106 .rpc_argp = &lgp->args, 6107 .rpc_resp = &lgp->res, 6108 }; 6109 struct rpc_task_setup task_setup_data = { 6110 .rpc_client = server->client, 6111 .rpc_message = &msg, 6112 .callback_ops = &nfs4_layoutget_call_ops, 6113 .callback_data = lgp, 6114 .flags = RPC_TASK_ASYNC, 6115 }; 6116 struct pnfs_layout_segment *lseg = NULL; 6117 int status = 0; 6118 6119 dprintk("--> %s\n", __func__); 6120 6121 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 6122 if (!lgp->args.layout.pages) { 6123 nfs4_layoutget_release(lgp); 6124 return ERR_PTR(-ENOMEM); 6125 } 6126 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 6127 6128 lgp->res.layoutp = &lgp->args.layout; 6129 lgp->res.seq_res.sr_slot = NULL; 6130 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 6131 task = rpc_run_task(&task_setup_data); 6132 if (IS_ERR(task)) 6133 return ERR_CAST(task); 6134 status = nfs4_wait_for_completion_rpc_task(task); 6135 if (status == 0) 6136 status = task->tk_status; 6137 if (status == 0) 6138 lseg = pnfs_layout_process(lgp); 6139 rpc_put_task(task); 6140 dprintk("<-- %s status=%d\n", __func__, status); 6141 if (status) 6142 return ERR_PTR(status); 6143 return lseg; 6144 } 6145 6146 static void 6147 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 6148 { 6149 struct nfs4_layoutreturn *lrp = calldata; 6150 6151 dprintk("--> %s\n", __func__); 6152 nfs41_setup_sequence(lrp->clp->cl_session, 6153 &lrp->args.seq_args, 6154 &lrp->res.seq_res, 6155 task); 6156 } 6157 6158 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 6159 { 6160 struct nfs4_layoutreturn *lrp = calldata; 6161 struct nfs_server *server; 6162 6163 dprintk("--> %s\n", __func__); 6164 6165 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 6166 return; 6167 6168 server = NFS_SERVER(lrp->args.inode); 6169 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { 6170 rpc_restart_call_prepare(task); 6171 return; 6172 } 6173 dprintk("<-- %s\n", __func__); 6174 } 6175 6176 static void nfs4_layoutreturn_release(void *calldata) 6177 { 6178 struct nfs4_layoutreturn *lrp = calldata; 6179 struct pnfs_layout_hdr *lo = lrp->args.layout; 6180 6181 dprintk("--> %s\n", __func__); 6182 spin_lock(&lo->plh_inode->i_lock); 6183 if (lrp->res.lrs_present) 6184 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 6185 lo->plh_block_lgets--; 6186 spin_unlock(&lo->plh_inode->i_lock); 6187 pnfs_put_layout_hdr(lrp->args.layout); 6188 kfree(calldata); 6189 dprintk("<-- %s\n", __func__); 6190 } 6191 6192 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 6193 .rpc_call_prepare = nfs4_layoutreturn_prepare, 6194 .rpc_call_done = nfs4_layoutreturn_done, 6195 .rpc_release = nfs4_layoutreturn_release, 6196 }; 6197 6198 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp) 6199 { 6200 struct rpc_task *task; 6201 struct rpc_message msg = { 6202 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 6203 .rpc_argp = &lrp->args, 6204 .rpc_resp = &lrp->res, 6205 }; 6206 struct rpc_task_setup task_setup_data = { 6207 .rpc_client = lrp->clp->cl_rpcclient, 6208 .rpc_message = &msg, 6209 .callback_ops = &nfs4_layoutreturn_call_ops, 6210 .callback_data = lrp, 6211 }; 6212 int status; 6213 6214 dprintk("--> %s\n", __func__); 6215 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 6216 task = rpc_run_task(&task_setup_data); 6217 if (IS_ERR(task)) 6218 return PTR_ERR(task); 6219 status = task->tk_status; 6220 dprintk("<-- %s status=%d\n", __func__, status); 6221 rpc_put_task(task); 6222 return status; 6223 } 6224 6225 /* 6226 * Retrieve the list of Data Server devices from the MDS. 6227 */ 6228 static int _nfs4_getdevicelist(struct nfs_server *server, 6229 const struct nfs_fh *fh, 6230 struct pnfs_devicelist *devlist) 6231 { 6232 struct nfs4_getdevicelist_args args = { 6233 .fh = fh, 6234 .layoutclass = server->pnfs_curr_ld->id, 6235 }; 6236 struct nfs4_getdevicelist_res res = { 6237 .devlist = devlist, 6238 }; 6239 struct rpc_message msg = { 6240 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST], 6241 .rpc_argp = &args, 6242 .rpc_resp = &res, 6243 }; 6244 int status; 6245 6246 dprintk("--> %s\n", __func__); 6247 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 6248 &res.seq_res, 0); 6249 dprintk("<-- %s status=%d\n", __func__, status); 6250 return status; 6251 } 6252 6253 int nfs4_proc_getdevicelist(struct nfs_server *server, 6254 const struct nfs_fh *fh, 6255 struct pnfs_devicelist *devlist) 6256 { 6257 struct nfs4_exception exception = { }; 6258 int err; 6259 6260 do { 6261 err = nfs4_handle_exception(server, 6262 _nfs4_getdevicelist(server, fh, devlist), 6263 &exception); 6264 } while (exception.retry); 6265 6266 dprintk("%s: err=%d, num_devs=%u\n", __func__, 6267 err, devlist->num_devs); 6268 6269 return err; 6270 } 6271 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist); 6272 6273 static int 6274 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev) 6275 { 6276 struct nfs4_getdeviceinfo_args args = { 6277 .pdev = pdev, 6278 }; 6279 struct nfs4_getdeviceinfo_res res = { 6280 .pdev = pdev, 6281 }; 6282 struct rpc_message msg = { 6283 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 6284 .rpc_argp = &args, 6285 .rpc_resp = &res, 6286 }; 6287 int status; 6288 6289 dprintk("--> %s\n", __func__); 6290 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 6291 dprintk("<-- %s status=%d\n", __func__, status); 6292 6293 return status; 6294 } 6295 6296 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev) 6297 { 6298 struct nfs4_exception exception = { }; 6299 int err; 6300 6301 do { 6302 err = nfs4_handle_exception(server, 6303 _nfs4_proc_getdeviceinfo(server, pdev), 6304 &exception); 6305 } while (exception.retry); 6306 return err; 6307 } 6308 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 6309 6310 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 6311 { 6312 struct nfs4_layoutcommit_data *data = calldata; 6313 struct nfs_server *server = NFS_SERVER(data->args.inode); 6314 struct nfs4_session *session = nfs4_get_session(server); 6315 6316 nfs41_setup_sequence(session, 6317 &data->args.seq_args, 6318 &data->res.seq_res, 6319 task); 6320 } 6321 6322 static void 6323 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 6324 { 6325 struct nfs4_layoutcommit_data *data = calldata; 6326 struct nfs_server *server = NFS_SERVER(data->args.inode); 6327 6328 if (!nfs41_sequence_done(task, &data->res.seq_res)) 6329 return; 6330 6331 switch (task->tk_status) { /* Just ignore these failures */ 6332 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 6333 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 6334 case -NFS4ERR_BADLAYOUT: /* no layout */ 6335 case -NFS4ERR_GRACE: /* loca_recalim always false */ 6336 task->tk_status = 0; 6337 break; 6338 case 0: 6339 nfs_post_op_update_inode_force_wcc(data->args.inode, 6340 data->res.fattr); 6341 break; 6342 default: 6343 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { 6344 rpc_restart_call_prepare(task); 6345 return; 6346 } 6347 } 6348 } 6349 6350 static void nfs4_layoutcommit_release(void *calldata) 6351 { 6352 struct nfs4_layoutcommit_data *data = calldata; 6353 struct pnfs_layout_segment *lseg, *tmp; 6354 unsigned long *bitlock = &NFS_I(data->args.inode)->flags; 6355 6356 pnfs_cleanup_layoutcommit(data); 6357 /* Matched by references in pnfs_set_layoutcommit */ 6358 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) { 6359 list_del_init(&lseg->pls_lc_list); 6360 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, 6361 &lseg->pls_flags)) 6362 pnfs_put_lseg(lseg); 6363 } 6364 6365 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 6366 smp_mb__after_clear_bit(); 6367 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 6368 6369 put_rpccred(data->cred); 6370 kfree(data); 6371 } 6372 6373 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 6374 .rpc_call_prepare = nfs4_layoutcommit_prepare, 6375 .rpc_call_done = nfs4_layoutcommit_done, 6376 .rpc_release = nfs4_layoutcommit_release, 6377 }; 6378 6379 int 6380 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 6381 { 6382 struct rpc_message msg = { 6383 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 6384 .rpc_argp = &data->args, 6385 .rpc_resp = &data->res, 6386 .rpc_cred = data->cred, 6387 }; 6388 struct rpc_task_setup task_setup_data = { 6389 .task = &data->task, 6390 .rpc_client = NFS_CLIENT(data->args.inode), 6391 .rpc_message = &msg, 6392 .callback_ops = &nfs4_layoutcommit_ops, 6393 .callback_data = data, 6394 .flags = RPC_TASK_ASYNC, 6395 }; 6396 struct rpc_task *task; 6397 int status = 0; 6398 6399 dprintk("NFS: %4d initiating layoutcommit call. sync %d " 6400 "lbw: %llu inode %lu\n", 6401 data->task.tk_pid, sync, 6402 data->args.lastbytewritten, 6403 data->args.inode->i_ino); 6404 6405 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 6406 task = rpc_run_task(&task_setup_data); 6407 if (IS_ERR(task)) 6408 return PTR_ERR(task); 6409 if (sync == false) 6410 goto out; 6411 status = nfs4_wait_for_completion_rpc_task(task); 6412 if (status != 0) 6413 goto out; 6414 status = task->tk_status; 6415 out: 6416 dprintk("%s: status %d\n", __func__, status); 6417 rpc_put_task(task); 6418 return status; 6419 } 6420 6421 static int 6422 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 6423 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 6424 { 6425 struct nfs41_secinfo_no_name_args args = { 6426 .style = SECINFO_STYLE_CURRENT_FH, 6427 }; 6428 struct nfs4_secinfo_res res = { 6429 .flavors = flavors, 6430 }; 6431 struct rpc_message msg = { 6432 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 6433 .rpc_argp = &args, 6434 .rpc_resp = &res, 6435 }; 6436 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 6437 } 6438 6439 static int 6440 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 6441 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 6442 { 6443 struct nfs4_exception exception = { }; 6444 int err; 6445 do { 6446 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 6447 switch (err) { 6448 case 0: 6449 case -NFS4ERR_WRONGSEC: 6450 case -NFS4ERR_NOTSUPP: 6451 goto out; 6452 default: 6453 err = nfs4_handle_exception(server, err, &exception); 6454 } 6455 } while (exception.retry); 6456 out: 6457 return err; 6458 } 6459 6460 static int 6461 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 6462 struct nfs_fsinfo *info) 6463 { 6464 int err; 6465 struct page *page; 6466 rpc_authflavor_t flavor; 6467 struct nfs4_secinfo_flavors *flavors; 6468 6469 page = alloc_page(GFP_KERNEL); 6470 if (!page) { 6471 err = -ENOMEM; 6472 goto out; 6473 } 6474 6475 flavors = page_address(page); 6476 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 6477 6478 /* 6479 * Fall back on "guess and check" method if 6480 * the server doesn't support SECINFO_NO_NAME 6481 */ 6482 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) { 6483 err = nfs4_find_root_sec(server, fhandle, info); 6484 goto out_freepage; 6485 } 6486 if (err) 6487 goto out_freepage; 6488 6489 flavor = nfs_find_best_sec(flavors); 6490 if (err == 0) 6491 err = nfs4_lookup_root_sec(server, fhandle, info, flavor); 6492 6493 out_freepage: 6494 put_page(page); 6495 if (err == -EACCES) 6496 return -EPERM; 6497 out: 6498 return err; 6499 } 6500 6501 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6502 { 6503 int status; 6504 struct nfs41_test_stateid_args args = { 6505 .stateid = stateid, 6506 }; 6507 struct nfs41_test_stateid_res res; 6508 struct rpc_message msg = { 6509 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 6510 .rpc_argp = &args, 6511 .rpc_resp = &res, 6512 }; 6513 6514 dprintk("NFS call test_stateid %p\n", stateid); 6515 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0); 6516 nfs4_set_sequence_privileged(&args.seq_args); 6517 status = nfs4_call_sync_sequence(server->client, server, &msg, 6518 &args.seq_args, &res.seq_res); 6519 if (status != NFS_OK) { 6520 dprintk("NFS reply test_stateid: failed, %d\n", status); 6521 return status; 6522 } 6523 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 6524 return -res.status; 6525 } 6526 6527 /** 6528 * nfs41_test_stateid - perform a TEST_STATEID operation 6529 * 6530 * @server: server / transport on which to perform the operation 6531 * @stateid: state ID to test 6532 * 6533 * Returns NFS_OK if the server recognizes that "stateid" is valid. 6534 * Otherwise a negative NFS4ERR value is returned if the operation 6535 * failed or the state ID is not currently valid. 6536 */ 6537 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6538 { 6539 struct nfs4_exception exception = { }; 6540 int err; 6541 do { 6542 err = _nfs41_test_stateid(server, stateid); 6543 if (err != -NFS4ERR_DELAY) 6544 break; 6545 nfs4_handle_exception(server, err, &exception); 6546 } while (exception.retry); 6547 return err; 6548 } 6549 6550 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6551 { 6552 struct nfs41_free_stateid_args args = { 6553 .stateid = stateid, 6554 }; 6555 struct nfs41_free_stateid_res res; 6556 struct rpc_message msg = { 6557 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 6558 .rpc_argp = &args, 6559 .rpc_resp = &res, 6560 }; 6561 int status; 6562 6563 dprintk("NFS call free_stateid %p\n", stateid); 6564 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0); 6565 nfs4_set_sequence_privileged(&args.seq_args); 6566 status = nfs4_call_sync_sequence(server->client, server, &msg, 6567 &args.seq_args, &res.seq_res); 6568 dprintk("NFS reply free_stateid: %d\n", status); 6569 return status; 6570 } 6571 6572 /** 6573 * nfs41_free_stateid - perform a FREE_STATEID operation 6574 * 6575 * @server: server / transport on which to perform the operation 6576 * @stateid: state ID to release 6577 * 6578 * Returns NFS_OK if the server freed "stateid". Otherwise a 6579 * negative NFS4ERR value is returned. 6580 */ 6581 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6582 { 6583 struct nfs4_exception exception = { }; 6584 int err; 6585 do { 6586 err = _nfs4_free_stateid(server, stateid); 6587 if (err != -NFS4ERR_DELAY) 6588 break; 6589 nfs4_handle_exception(server, err, &exception); 6590 } while (exception.retry); 6591 return err; 6592 } 6593 6594 static bool nfs41_match_stateid(const nfs4_stateid *s1, 6595 const nfs4_stateid *s2) 6596 { 6597 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 6598 return false; 6599 6600 if (s1->seqid == s2->seqid) 6601 return true; 6602 if (s1->seqid == 0 || s2->seqid == 0) 6603 return true; 6604 6605 return false; 6606 } 6607 6608 #endif /* CONFIG_NFS_V4_1 */ 6609 6610 static bool nfs4_match_stateid(const nfs4_stateid *s1, 6611 const nfs4_stateid *s2) 6612 { 6613 return nfs4_stateid_match(s1, s2); 6614 } 6615 6616 6617 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 6618 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 6619 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 6620 .recover_open = nfs4_open_reclaim, 6621 .recover_lock = nfs4_lock_reclaim, 6622 .establish_clid = nfs4_init_clientid, 6623 .get_clid_cred = nfs4_get_setclientid_cred, 6624 .detect_trunking = nfs40_discover_server_trunking, 6625 }; 6626 6627 #if defined(CONFIG_NFS_V4_1) 6628 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 6629 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 6630 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 6631 .recover_open = nfs4_open_reclaim, 6632 .recover_lock = nfs4_lock_reclaim, 6633 .establish_clid = nfs41_init_clientid, 6634 .get_clid_cred = nfs4_get_exchange_id_cred, 6635 .reclaim_complete = nfs41_proc_reclaim_complete, 6636 .detect_trunking = nfs41_discover_server_trunking, 6637 }; 6638 #endif /* CONFIG_NFS_V4_1 */ 6639 6640 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 6641 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 6642 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 6643 .recover_open = nfs4_open_expired, 6644 .recover_lock = nfs4_lock_expired, 6645 .establish_clid = nfs4_init_clientid, 6646 .get_clid_cred = nfs4_get_setclientid_cred, 6647 }; 6648 6649 #if defined(CONFIG_NFS_V4_1) 6650 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 6651 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 6652 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 6653 .recover_open = nfs41_open_expired, 6654 .recover_lock = nfs41_lock_expired, 6655 .establish_clid = nfs41_init_clientid, 6656 .get_clid_cred = nfs4_get_exchange_id_cred, 6657 }; 6658 #endif /* CONFIG_NFS_V4_1 */ 6659 6660 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 6661 .sched_state_renewal = nfs4_proc_async_renew, 6662 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 6663 .renew_lease = nfs4_proc_renew, 6664 }; 6665 6666 #if defined(CONFIG_NFS_V4_1) 6667 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 6668 .sched_state_renewal = nfs41_proc_async_sequence, 6669 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 6670 .renew_lease = nfs4_proc_sequence, 6671 }; 6672 #endif 6673 6674 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 6675 .minor_version = 0, 6676 .call_sync = _nfs4_call_sync, 6677 .match_stateid = nfs4_match_stateid, 6678 .find_root_sec = nfs4_find_root_sec, 6679 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 6680 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 6681 .state_renewal_ops = &nfs40_state_renewal_ops, 6682 }; 6683 6684 #if defined(CONFIG_NFS_V4_1) 6685 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 6686 .minor_version = 1, 6687 .call_sync = nfs4_call_sync_sequence, 6688 .match_stateid = nfs41_match_stateid, 6689 .find_root_sec = nfs41_find_root_sec, 6690 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 6691 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 6692 .state_renewal_ops = &nfs41_state_renewal_ops, 6693 }; 6694 #endif 6695 6696 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 6697 [0] = &nfs_v4_0_minor_ops, 6698 #if defined(CONFIG_NFS_V4_1) 6699 [1] = &nfs_v4_1_minor_ops, 6700 #endif 6701 }; 6702 6703 const struct inode_operations nfs4_dir_inode_operations = { 6704 .create = nfs_create, 6705 .lookup = nfs_lookup, 6706 .atomic_open = nfs_atomic_open, 6707 .link = nfs_link, 6708 .unlink = nfs_unlink, 6709 .symlink = nfs_symlink, 6710 .mkdir = nfs_mkdir, 6711 .rmdir = nfs_rmdir, 6712 .mknod = nfs_mknod, 6713 .rename = nfs_rename, 6714 .permission = nfs_permission, 6715 .getattr = nfs_getattr, 6716 .setattr = nfs_setattr, 6717 .getxattr = generic_getxattr, 6718 .setxattr = generic_setxattr, 6719 .listxattr = generic_listxattr, 6720 .removexattr = generic_removexattr, 6721 }; 6722 6723 static const struct inode_operations nfs4_file_inode_operations = { 6724 .permission = nfs_permission, 6725 .getattr = nfs_getattr, 6726 .setattr = nfs_setattr, 6727 .getxattr = generic_getxattr, 6728 .setxattr = generic_setxattr, 6729 .listxattr = generic_listxattr, 6730 .removexattr = generic_removexattr, 6731 }; 6732 6733 const struct nfs_rpc_ops nfs_v4_clientops = { 6734 .version = 4, /* protocol version */ 6735 .dentry_ops = &nfs4_dentry_operations, 6736 .dir_inode_ops = &nfs4_dir_inode_operations, 6737 .file_inode_ops = &nfs4_file_inode_operations, 6738 .file_ops = &nfs4_file_operations, 6739 .getroot = nfs4_proc_get_root, 6740 .submount = nfs4_submount, 6741 .try_mount = nfs4_try_mount, 6742 .getattr = nfs4_proc_getattr, 6743 .setattr = nfs4_proc_setattr, 6744 .lookup = nfs4_proc_lookup, 6745 .access = nfs4_proc_access, 6746 .readlink = nfs4_proc_readlink, 6747 .create = nfs4_proc_create, 6748 .remove = nfs4_proc_remove, 6749 .unlink_setup = nfs4_proc_unlink_setup, 6750 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 6751 .unlink_done = nfs4_proc_unlink_done, 6752 .rename = nfs4_proc_rename, 6753 .rename_setup = nfs4_proc_rename_setup, 6754 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 6755 .rename_done = nfs4_proc_rename_done, 6756 .link = nfs4_proc_link, 6757 .symlink = nfs4_proc_symlink, 6758 .mkdir = nfs4_proc_mkdir, 6759 .rmdir = nfs4_proc_remove, 6760 .readdir = nfs4_proc_readdir, 6761 .mknod = nfs4_proc_mknod, 6762 .statfs = nfs4_proc_statfs, 6763 .fsinfo = nfs4_proc_fsinfo, 6764 .pathconf = nfs4_proc_pathconf, 6765 .set_capabilities = nfs4_server_capabilities, 6766 .decode_dirent = nfs4_decode_dirent, 6767 .read_setup = nfs4_proc_read_setup, 6768 .read_pageio_init = pnfs_pageio_init_read, 6769 .read_rpc_prepare = nfs4_proc_read_rpc_prepare, 6770 .read_done = nfs4_read_done, 6771 .write_setup = nfs4_proc_write_setup, 6772 .write_pageio_init = pnfs_pageio_init_write, 6773 .write_rpc_prepare = nfs4_proc_write_rpc_prepare, 6774 .write_done = nfs4_write_done, 6775 .commit_setup = nfs4_proc_commit_setup, 6776 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 6777 .commit_done = nfs4_commit_done, 6778 .lock = nfs4_proc_lock, 6779 .clear_acl_cache = nfs4_zap_acl_attr, 6780 .close_context = nfs4_close_context, 6781 .open_context = nfs4_atomic_open, 6782 .have_delegation = nfs4_have_delegation, 6783 .return_delegation = nfs4_inode_return_delegation, 6784 .alloc_client = nfs4_alloc_client, 6785 .init_client = nfs4_init_client, 6786 .free_client = nfs4_free_client, 6787 .create_server = nfs4_create_server, 6788 .clone_server = nfs_clone_server, 6789 }; 6790 6791 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 6792 .prefix = XATTR_NAME_NFSV4_ACL, 6793 .list = nfs4_xattr_list_nfs4_acl, 6794 .get = nfs4_xattr_get_nfs4_acl, 6795 .set = nfs4_xattr_set_nfs4_acl, 6796 }; 6797 6798 const struct xattr_handler *nfs4_xattr_handlers[] = { 6799 &nfs4_xattr_nfs4_acl_handler, 6800 NULL 6801 }; 6802 6803 /* 6804 * Local variables: 6805 * c-basic-offset: 8 6806 * End: 6807 */ 6808