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