1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/nfs_idmap.h> 55 #include <linux/xattr.h> 56 #include <linux/utsname.h> 57 #include <linux/freezer.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "nfs4session.h" 67 #include "fscache.h" 68 69 #define NFSDBG_FACILITY NFSDBG_PROC 70 71 #define NFS4_POLL_RETRY_MIN (HZ/10) 72 #define NFS4_POLL_RETRY_MAX (15*HZ) 73 74 struct nfs4_opendata; 75 static int _nfs4_proc_open(struct nfs4_opendata *data); 76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *); 79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *); 81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr); 82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 83 struct nfs_fattr *fattr, struct iattr *sattr, 84 struct nfs4_state *state); 85 #ifdef CONFIG_NFS_V4_1 86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *); 87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *); 88 #endif 89 /* Prevent leaks of NFSv4 errors into userland */ 90 static int nfs4_map_errors(int err) 91 { 92 if (err >= -1000) 93 return err; 94 switch (err) { 95 case -NFS4ERR_RESOURCE: 96 return -EREMOTEIO; 97 case -NFS4ERR_WRONGSEC: 98 return -EPERM; 99 case -NFS4ERR_BADOWNER: 100 case -NFS4ERR_BADNAME: 101 return -EINVAL; 102 case -NFS4ERR_SHARE_DENIED: 103 return -EACCES; 104 case -NFS4ERR_MINOR_VERS_MISMATCH: 105 return -EPROTONOSUPPORT; 106 case -NFS4ERR_ACCESS: 107 return -EACCES; 108 default: 109 dprintk("%s could not handle NFSv4 error %d\n", 110 __func__, -err); 111 break; 112 } 113 return -EIO; 114 } 115 116 /* 117 * This is our standard bitmap for GETATTR requests. 118 */ 119 const u32 nfs4_fattr_bitmap[3] = { 120 FATTR4_WORD0_TYPE 121 | FATTR4_WORD0_CHANGE 122 | FATTR4_WORD0_SIZE 123 | FATTR4_WORD0_FSID 124 | FATTR4_WORD0_FILEID, 125 FATTR4_WORD1_MODE 126 | FATTR4_WORD1_NUMLINKS 127 | FATTR4_WORD1_OWNER 128 | FATTR4_WORD1_OWNER_GROUP 129 | FATTR4_WORD1_RAWDEV 130 | FATTR4_WORD1_SPACE_USED 131 | FATTR4_WORD1_TIME_ACCESS 132 | FATTR4_WORD1_TIME_METADATA 133 | FATTR4_WORD1_TIME_MODIFY 134 }; 135 136 static const u32 nfs4_pnfs_open_bitmap[3] = { 137 FATTR4_WORD0_TYPE 138 | FATTR4_WORD0_CHANGE 139 | FATTR4_WORD0_SIZE 140 | FATTR4_WORD0_FSID 141 | FATTR4_WORD0_FILEID, 142 FATTR4_WORD1_MODE 143 | FATTR4_WORD1_NUMLINKS 144 | FATTR4_WORD1_OWNER 145 | FATTR4_WORD1_OWNER_GROUP 146 | FATTR4_WORD1_RAWDEV 147 | FATTR4_WORD1_SPACE_USED 148 | FATTR4_WORD1_TIME_ACCESS 149 | FATTR4_WORD1_TIME_METADATA 150 | FATTR4_WORD1_TIME_MODIFY, 151 FATTR4_WORD2_MDSTHRESHOLD 152 }; 153 154 static const u32 nfs4_open_noattr_bitmap[3] = { 155 FATTR4_WORD0_TYPE 156 | FATTR4_WORD0_CHANGE 157 | FATTR4_WORD0_FILEID, 158 }; 159 160 const u32 nfs4_statfs_bitmap[2] = { 161 FATTR4_WORD0_FILES_AVAIL 162 | FATTR4_WORD0_FILES_FREE 163 | FATTR4_WORD0_FILES_TOTAL, 164 FATTR4_WORD1_SPACE_AVAIL 165 | FATTR4_WORD1_SPACE_FREE 166 | FATTR4_WORD1_SPACE_TOTAL 167 }; 168 169 const u32 nfs4_pathconf_bitmap[2] = { 170 FATTR4_WORD0_MAXLINK 171 | FATTR4_WORD0_MAXNAME, 172 0 173 }; 174 175 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 176 | FATTR4_WORD0_MAXREAD 177 | FATTR4_WORD0_MAXWRITE 178 | FATTR4_WORD0_LEASE_TIME, 179 FATTR4_WORD1_TIME_DELTA 180 | FATTR4_WORD1_FS_LAYOUT_TYPES, 181 FATTR4_WORD2_LAYOUT_BLKSIZE 182 }; 183 184 const u32 nfs4_fs_locations_bitmap[2] = { 185 FATTR4_WORD0_TYPE 186 | FATTR4_WORD0_CHANGE 187 | FATTR4_WORD0_SIZE 188 | FATTR4_WORD0_FSID 189 | FATTR4_WORD0_FILEID 190 | FATTR4_WORD0_FS_LOCATIONS, 191 FATTR4_WORD1_MODE 192 | FATTR4_WORD1_NUMLINKS 193 | FATTR4_WORD1_OWNER 194 | FATTR4_WORD1_OWNER_GROUP 195 | FATTR4_WORD1_RAWDEV 196 | FATTR4_WORD1_SPACE_USED 197 | FATTR4_WORD1_TIME_ACCESS 198 | FATTR4_WORD1_TIME_METADATA 199 | FATTR4_WORD1_TIME_MODIFY 200 | FATTR4_WORD1_MOUNTED_ON_FILEID 201 }; 202 203 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 204 struct nfs4_readdir_arg *readdir) 205 { 206 __be32 *start, *p; 207 208 if (cookie > 2) { 209 readdir->cookie = cookie; 210 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 211 return; 212 } 213 214 readdir->cookie = 0; 215 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 216 if (cookie == 2) 217 return; 218 219 /* 220 * NFSv4 servers do not return entries for '.' and '..' 221 * Therefore, we fake these entries here. We let '.' 222 * have cookie 0 and '..' have cookie 1. Note that 223 * when talking to the server, we always send cookie 0 224 * instead of 1 or 2. 225 */ 226 start = p = kmap_atomic(*readdir->pages); 227 228 if (cookie == 0) { 229 *p++ = xdr_one; /* next */ 230 *p++ = xdr_zero; /* cookie, first word */ 231 *p++ = xdr_one; /* cookie, second word */ 232 *p++ = xdr_one; /* entry len */ 233 memcpy(p, ".\0\0\0", 4); /* entry */ 234 p++; 235 *p++ = xdr_one; /* bitmap length */ 236 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 237 *p++ = htonl(8); /* attribute buffer length */ 238 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode)); 239 } 240 241 *p++ = xdr_one; /* next */ 242 *p++ = xdr_zero; /* cookie, first word */ 243 *p++ = xdr_two; /* cookie, second word */ 244 *p++ = xdr_two; /* entry len */ 245 memcpy(p, "..\0\0", 4); /* entry */ 246 p++; 247 *p++ = xdr_one; /* bitmap length */ 248 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 249 *p++ = htonl(8); /* attribute buffer length */ 250 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode)); 251 252 readdir->pgbase = (char *)p - (char *)start; 253 readdir->count -= readdir->pgbase; 254 kunmap_atomic(start); 255 } 256 257 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 258 { 259 int res = 0; 260 261 might_sleep(); 262 263 if (*timeout <= 0) 264 *timeout = NFS4_POLL_RETRY_MIN; 265 if (*timeout > NFS4_POLL_RETRY_MAX) 266 *timeout = NFS4_POLL_RETRY_MAX; 267 freezable_schedule_timeout_killable(*timeout); 268 if (fatal_signal_pending(current)) 269 res = -ERESTARTSYS; 270 *timeout <<= 1; 271 return res; 272 } 273 274 /* This is the error handling routine for processes that are allowed 275 * to sleep. 276 */ 277 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 278 { 279 struct nfs_client *clp = server->nfs_client; 280 struct nfs4_state *state = exception->state; 281 struct inode *inode = exception->inode; 282 int ret = errorcode; 283 284 exception->retry = 0; 285 switch(errorcode) { 286 case 0: 287 return 0; 288 case -NFS4ERR_OPENMODE: 289 if (inode && nfs4_have_delegation(inode, FMODE_READ)) { 290 nfs4_inode_return_delegation(inode); 291 exception->retry = 1; 292 return 0; 293 } 294 if (state == NULL) 295 break; 296 nfs4_schedule_stateid_recovery(server, state); 297 goto wait_on_recovery; 298 case -NFS4ERR_DELEG_REVOKED: 299 case -NFS4ERR_ADMIN_REVOKED: 300 case -NFS4ERR_BAD_STATEID: 301 if (state == NULL) 302 break; 303 nfs_remove_bad_delegation(state->inode); 304 nfs4_schedule_stateid_recovery(server, state); 305 goto wait_on_recovery; 306 case -NFS4ERR_EXPIRED: 307 if (state != NULL) 308 nfs4_schedule_stateid_recovery(server, state); 309 case -NFS4ERR_STALE_STATEID: 310 case -NFS4ERR_STALE_CLIENTID: 311 nfs4_schedule_lease_recovery(clp); 312 goto wait_on_recovery; 313 #if defined(CONFIG_NFS_V4_1) 314 case -NFS4ERR_BADSESSION: 315 case -NFS4ERR_BADSLOT: 316 case -NFS4ERR_BAD_HIGH_SLOT: 317 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 318 case -NFS4ERR_DEADSESSION: 319 case -NFS4ERR_SEQ_FALSE_RETRY: 320 case -NFS4ERR_SEQ_MISORDERED: 321 dprintk("%s ERROR: %d Reset session\n", __func__, 322 errorcode); 323 nfs4_schedule_session_recovery(clp->cl_session, errorcode); 324 goto wait_on_recovery; 325 #endif /* defined(CONFIG_NFS_V4_1) */ 326 case -NFS4ERR_FILE_OPEN: 327 if (exception->timeout > HZ) { 328 /* We have retried a decent amount, time to 329 * fail 330 */ 331 ret = -EBUSY; 332 break; 333 } 334 case -NFS4ERR_GRACE: 335 case -NFS4ERR_DELAY: 336 ret = nfs4_delay(server->client, &exception->timeout); 337 if (ret != 0) 338 break; 339 case -NFS4ERR_RETRY_UNCACHED_REP: 340 case -NFS4ERR_OLD_STATEID: 341 exception->retry = 1; 342 break; 343 case -NFS4ERR_BADOWNER: 344 /* The following works around a Linux server bug! */ 345 case -NFS4ERR_BADNAME: 346 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 347 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 348 exception->retry = 1; 349 printk(KERN_WARNING "NFS: v4 server %s " 350 "does not accept raw " 351 "uid/gids. " 352 "Reenabling the idmapper.\n", 353 server->nfs_client->cl_hostname); 354 } 355 } 356 /* We failed to handle the error */ 357 return nfs4_map_errors(ret); 358 wait_on_recovery: 359 ret = nfs4_wait_clnt_recover(clp); 360 if (ret == 0) 361 exception->retry = 1; 362 return ret; 363 } 364 365 366 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 367 { 368 spin_lock(&clp->cl_lock); 369 if (time_before(clp->cl_last_renewal,timestamp)) 370 clp->cl_last_renewal = timestamp; 371 spin_unlock(&clp->cl_lock); 372 } 373 374 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 375 { 376 do_renew_lease(server->nfs_client, timestamp); 377 } 378 379 #if defined(CONFIG_NFS_V4_1) 380 381 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 382 { 383 struct nfs4_session *session; 384 struct nfs4_slot_table *tbl; 385 bool send_new_highest_used_slotid = false; 386 387 if (!res->sr_slot) { 388 /* just wake up the next guy waiting since 389 * we may have not consumed a slot after all */ 390 dprintk("%s: No slot\n", __func__); 391 return; 392 } 393 tbl = res->sr_slot->table; 394 session = tbl->session; 395 396 spin_lock(&tbl->slot_tbl_lock); 397 /* Be nice to the server: try to ensure that the last transmitted 398 * value for highest_user_slotid <= target_highest_slotid 399 */ 400 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 401 send_new_highest_used_slotid = true; 402 403 if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) { 404 send_new_highest_used_slotid = false; 405 goto out_unlock; 406 } 407 nfs4_free_slot(tbl, res->sr_slot); 408 409 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 410 send_new_highest_used_slotid = false; 411 out_unlock: 412 spin_unlock(&tbl->slot_tbl_lock); 413 res->sr_slot = NULL; 414 if (send_new_highest_used_slotid) 415 nfs41_server_notify_highest_slotid_update(session->clp); 416 } 417 418 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 419 { 420 struct nfs4_session *session; 421 struct nfs4_slot *slot; 422 struct nfs_client *clp; 423 bool interrupted = false; 424 int ret = 1; 425 426 /* don't increment the sequence number if the task wasn't sent */ 427 if (!RPC_WAS_SENT(task)) 428 goto out; 429 430 slot = res->sr_slot; 431 session = slot->table->session; 432 433 if (slot->interrupted) { 434 slot->interrupted = 0; 435 interrupted = true; 436 } 437 438 /* Check the SEQUENCE operation status */ 439 switch (res->sr_status) { 440 case 0: 441 /* Update the slot's sequence and clientid lease timer */ 442 ++slot->seq_nr; 443 clp = session->clp; 444 do_renew_lease(clp, res->sr_timestamp); 445 /* Check sequence flags */ 446 if (res->sr_status_flags != 0) 447 nfs4_schedule_lease_recovery(clp); 448 nfs41_update_target_slotid(slot->table, slot, res); 449 break; 450 case 1: 451 /* 452 * sr_status remains 1 if an RPC level error occurred. 453 * The server may or may not have processed the sequence 454 * operation.. 455 * Mark the slot as having hosted an interrupted RPC call. 456 */ 457 slot->interrupted = 1; 458 goto out; 459 case -NFS4ERR_DELAY: 460 /* The server detected a resend of the RPC call and 461 * returned NFS4ERR_DELAY as per Section 2.10.6.2 462 * of RFC5661. 463 */ 464 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 465 __func__, 466 slot->slot_nr, 467 slot->seq_nr); 468 goto out_retry; 469 case -NFS4ERR_BADSLOT: 470 /* 471 * The slot id we used was probably retired. Try again 472 * using a different slot id. 473 */ 474 goto retry_nowait; 475 case -NFS4ERR_SEQ_MISORDERED: 476 /* 477 * Was the last operation on this sequence interrupted? 478 * If so, retry after bumping the sequence number. 479 */ 480 if (interrupted) { 481 ++slot->seq_nr; 482 goto retry_nowait; 483 } 484 /* 485 * Could this slot have been previously retired? 486 * If so, then the server may be expecting seq_nr = 1! 487 */ 488 if (slot->seq_nr != 1) { 489 slot->seq_nr = 1; 490 goto retry_nowait; 491 } 492 break; 493 case -NFS4ERR_SEQ_FALSE_RETRY: 494 ++slot->seq_nr; 495 goto retry_nowait; 496 default: 497 /* Just update the slot sequence no. */ 498 ++slot->seq_nr; 499 } 500 out: 501 /* The session may be reset by one of the error handlers. */ 502 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 503 nfs41_sequence_free_slot(res); 504 return ret; 505 retry_nowait: 506 if (rpc_restart_call_prepare(task)) { 507 task->tk_status = 0; 508 ret = 0; 509 } 510 goto out; 511 out_retry: 512 if (!rpc_restart_call(task)) 513 goto out; 514 rpc_delay(task, NFS4_POLL_RETRY_MAX); 515 return 0; 516 } 517 518 static int nfs4_sequence_done(struct rpc_task *task, 519 struct nfs4_sequence_res *res) 520 { 521 if (res->sr_slot == NULL) 522 return 1; 523 return nfs41_sequence_done(task, res); 524 } 525 526 static void nfs41_init_sequence(struct nfs4_sequence_args *args, 527 struct nfs4_sequence_res *res, int cache_reply) 528 { 529 args->sa_slot = NULL; 530 args->sa_cache_this = 0; 531 args->sa_privileged = 0; 532 if (cache_reply) 533 args->sa_cache_this = 1; 534 res->sr_slot = NULL; 535 } 536 537 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 538 { 539 args->sa_privileged = 1; 540 } 541 542 int nfs41_setup_sequence(struct nfs4_session *session, 543 struct nfs4_sequence_args *args, 544 struct nfs4_sequence_res *res, 545 struct rpc_task *task) 546 { 547 struct nfs4_slot *slot; 548 struct nfs4_slot_table *tbl; 549 550 dprintk("--> %s\n", __func__); 551 /* slot already allocated? */ 552 if (res->sr_slot != NULL) 553 goto out_success; 554 555 tbl = &session->fc_slot_table; 556 557 task->tk_timeout = 0; 558 559 spin_lock(&tbl->slot_tbl_lock); 560 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) && 561 !args->sa_privileged) { 562 /* The state manager will wait until the slot table is empty */ 563 dprintk("%s session is draining\n", __func__); 564 goto out_sleep; 565 } 566 567 slot = nfs4_alloc_slot(tbl); 568 if (IS_ERR(slot)) { 569 /* If out of memory, try again in 1/4 second */ 570 if (slot == ERR_PTR(-ENOMEM)) 571 task->tk_timeout = HZ >> 2; 572 dprintk("<-- %s: no free slots\n", __func__); 573 goto out_sleep; 574 } 575 spin_unlock(&tbl->slot_tbl_lock); 576 577 args->sa_slot = slot; 578 579 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, 580 slot->slot_nr, slot->seq_nr); 581 582 res->sr_slot = slot; 583 res->sr_timestamp = jiffies; 584 res->sr_status_flags = 0; 585 /* 586 * sr_status is only set in decode_sequence, and so will remain 587 * set to 1 if an rpc level failure occurs. 588 */ 589 res->sr_status = 1; 590 out_success: 591 rpc_call_start(task); 592 return 0; 593 out_sleep: 594 /* Privileged tasks are queued with top priority */ 595 if (args->sa_privileged) 596 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 597 NULL, RPC_PRIORITY_PRIVILEGED); 598 else 599 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 600 spin_unlock(&tbl->slot_tbl_lock); 601 return -EAGAIN; 602 } 603 EXPORT_SYMBOL_GPL(nfs41_setup_sequence); 604 605 int nfs4_setup_sequence(const struct nfs_server *server, 606 struct nfs4_sequence_args *args, 607 struct nfs4_sequence_res *res, 608 struct rpc_task *task) 609 { 610 struct nfs4_session *session = nfs4_get_session(server); 611 int ret = 0; 612 613 if (session == NULL) { 614 rpc_call_start(task); 615 goto out; 616 } 617 618 dprintk("--> %s clp %p session %p sr_slot %d\n", 619 __func__, session->clp, session, res->sr_slot ? 620 res->sr_slot->slot_nr : -1); 621 622 ret = nfs41_setup_sequence(session, args, res, task); 623 out: 624 dprintk("<-- %s status=%d\n", __func__, ret); 625 return ret; 626 } 627 628 struct nfs41_call_sync_data { 629 const struct nfs_server *seq_server; 630 struct nfs4_sequence_args *seq_args; 631 struct nfs4_sequence_res *seq_res; 632 }; 633 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 635 { 636 struct nfs41_call_sync_data *data = calldata; 637 struct nfs4_session *session = nfs4_get_session(data->seq_server); 638 639 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 640 641 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task); 642 } 643 644 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 645 { 646 struct nfs41_call_sync_data *data = calldata; 647 648 nfs41_sequence_done(task, data->seq_res); 649 } 650 651 static const struct rpc_call_ops nfs41_call_sync_ops = { 652 .rpc_call_prepare = nfs41_call_sync_prepare, 653 .rpc_call_done = nfs41_call_sync_done, 654 }; 655 656 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 657 struct nfs_server *server, 658 struct rpc_message *msg, 659 struct nfs4_sequence_args *args, 660 struct nfs4_sequence_res *res) 661 { 662 int ret; 663 struct rpc_task *task; 664 struct nfs41_call_sync_data data = { 665 .seq_server = server, 666 .seq_args = args, 667 .seq_res = res, 668 }; 669 struct rpc_task_setup task_setup = { 670 .rpc_client = clnt, 671 .rpc_message = msg, 672 .callback_ops = &nfs41_call_sync_ops, 673 .callback_data = &data 674 }; 675 676 task = rpc_run_task(&task_setup); 677 if (IS_ERR(task)) 678 ret = PTR_ERR(task); 679 else { 680 ret = task->tk_status; 681 rpc_put_task(task); 682 } 683 return ret; 684 } 685 686 #else 687 static 688 void nfs41_init_sequence(struct nfs4_sequence_args *args, 689 struct nfs4_sequence_res *res, int cache_reply) 690 { 691 } 692 693 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) 694 { 695 } 696 697 698 static int nfs4_sequence_done(struct rpc_task *task, 699 struct nfs4_sequence_res *res) 700 { 701 return 1; 702 } 703 #endif /* CONFIG_NFS_V4_1 */ 704 705 static 706 int _nfs4_call_sync(struct rpc_clnt *clnt, 707 struct nfs_server *server, 708 struct rpc_message *msg, 709 struct nfs4_sequence_args *args, 710 struct nfs4_sequence_res *res) 711 { 712 return rpc_call_sync(clnt, msg, 0); 713 } 714 715 static 716 int nfs4_call_sync(struct rpc_clnt *clnt, 717 struct nfs_server *server, 718 struct rpc_message *msg, 719 struct nfs4_sequence_args *args, 720 struct nfs4_sequence_res *res, 721 int cache_reply) 722 { 723 nfs41_init_sequence(args, res, cache_reply); 724 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg, 725 args, res); 726 } 727 728 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 729 { 730 struct nfs_inode *nfsi = NFS_I(dir); 731 732 spin_lock(&dir->i_lock); 733 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 734 if (!cinfo->atomic || cinfo->before != dir->i_version) 735 nfs_force_lookup_revalidate(dir); 736 dir->i_version = cinfo->after; 737 nfs_fscache_invalidate(dir); 738 spin_unlock(&dir->i_lock); 739 } 740 741 struct nfs4_opendata { 742 struct kref kref; 743 struct nfs_openargs o_arg; 744 struct nfs_openres o_res; 745 struct nfs_open_confirmargs c_arg; 746 struct nfs_open_confirmres c_res; 747 struct nfs4_string owner_name; 748 struct nfs4_string group_name; 749 struct nfs_fattr f_attr; 750 struct dentry *dir; 751 struct dentry *dentry; 752 struct nfs4_state_owner *owner; 753 struct nfs4_state *state; 754 struct iattr attrs; 755 unsigned long timestamp; 756 unsigned int rpc_done : 1; 757 int rpc_status; 758 int cancelled; 759 }; 760 761 762 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 763 { 764 p->o_res.f_attr = &p->f_attr; 765 p->o_res.seqid = p->o_arg.seqid; 766 p->c_res.seqid = p->c_arg.seqid; 767 p->o_res.server = p->o_arg.server; 768 p->o_res.access_request = p->o_arg.access; 769 nfs_fattr_init(&p->f_attr); 770 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 771 } 772 773 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 774 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 775 const struct iattr *attrs, 776 gfp_t gfp_mask) 777 { 778 struct dentry *parent = dget_parent(dentry); 779 struct inode *dir = parent->d_inode; 780 struct nfs_server *server = NFS_SERVER(dir); 781 struct nfs4_opendata *p; 782 783 p = kzalloc(sizeof(*p), gfp_mask); 784 if (p == NULL) 785 goto err; 786 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask); 787 if (p->o_arg.seqid == NULL) 788 goto err_free; 789 nfs_sb_active(dentry->d_sb); 790 p->dentry = dget(dentry); 791 p->dir = parent; 792 p->owner = sp; 793 atomic_inc(&sp->so_count); 794 p->o_arg.fh = NFS_FH(dir); 795 p->o_arg.open_flags = flags; 796 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 797 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS 798 * will return permission denied for all bits until close */ 799 if (!(flags & O_EXCL)) { 800 /* ask server to check for all possible rights as results 801 * are cached */ 802 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 803 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE; 804 } 805 p->o_arg.clientid = server->nfs_client->cl_clientid; 806 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 807 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 808 p->o_arg.name = &dentry->d_name; 809 p->o_arg.server = server; 810 p->o_arg.bitmask = server->attr_bitmask; 811 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 812 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL; 813 if (attrs != NULL && attrs->ia_valid != 0) { 814 __be32 verf[2]; 815 816 p->o_arg.u.attrs = &p->attrs; 817 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 818 819 verf[0] = jiffies; 820 verf[1] = current->pid; 821 memcpy(p->o_arg.u.verifier.data, verf, 822 sizeof(p->o_arg.u.verifier.data)); 823 } 824 p->c_arg.fh = &p->o_res.fh; 825 p->c_arg.stateid = &p->o_res.stateid; 826 p->c_arg.seqid = p->o_arg.seqid; 827 nfs4_init_opendata_res(p); 828 kref_init(&p->kref); 829 return p; 830 err_free: 831 kfree(p); 832 err: 833 dput(parent); 834 return NULL; 835 } 836 837 static void nfs4_opendata_free(struct kref *kref) 838 { 839 struct nfs4_opendata *p = container_of(kref, 840 struct nfs4_opendata, kref); 841 struct super_block *sb = p->dentry->d_sb; 842 843 nfs_free_seqid(p->o_arg.seqid); 844 if (p->state != NULL) 845 nfs4_put_open_state(p->state); 846 nfs4_put_state_owner(p->owner); 847 dput(p->dir); 848 dput(p->dentry); 849 nfs_sb_deactive(sb); 850 nfs_fattr_free_names(&p->f_attr); 851 kfree(p); 852 } 853 854 static void nfs4_opendata_put(struct nfs4_opendata *p) 855 { 856 if (p != NULL) 857 kref_put(&p->kref, nfs4_opendata_free); 858 } 859 860 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 861 { 862 int ret; 863 864 ret = rpc_wait_for_completion_task(task); 865 return ret; 866 } 867 868 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) 869 { 870 int ret = 0; 871 872 if (open_mode & (O_EXCL|O_TRUNC)) 873 goto out; 874 switch (mode & (FMODE_READ|FMODE_WRITE)) { 875 case FMODE_READ: 876 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 877 && state->n_rdonly != 0; 878 break; 879 case FMODE_WRITE: 880 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 881 && state->n_wronly != 0; 882 break; 883 case FMODE_READ|FMODE_WRITE: 884 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 885 && state->n_rdwr != 0; 886 } 887 out: 888 return ret; 889 } 890 891 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode) 892 { 893 if (delegation == NULL) 894 return 0; 895 if ((delegation->type & fmode) != fmode) 896 return 0; 897 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 898 return 0; 899 nfs_mark_delegation_referenced(delegation); 900 return 1; 901 } 902 903 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 904 { 905 switch (fmode) { 906 case FMODE_WRITE: 907 state->n_wronly++; 908 break; 909 case FMODE_READ: 910 state->n_rdonly++; 911 break; 912 case FMODE_READ|FMODE_WRITE: 913 state->n_rdwr++; 914 } 915 nfs4_state_set_mode_locked(state, state->state | fmode); 916 } 917 918 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 919 { 920 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 921 nfs4_stateid_copy(&state->stateid, stateid); 922 nfs4_stateid_copy(&state->open_stateid, stateid); 923 switch (fmode) { 924 case FMODE_READ: 925 set_bit(NFS_O_RDONLY_STATE, &state->flags); 926 break; 927 case FMODE_WRITE: 928 set_bit(NFS_O_WRONLY_STATE, &state->flags); 929 break; 930 case FMODE_READ|FMODE_WRITE: 931 set_bit(NFS_O_RDWR_STATE, &state->flags); 932 } 933 } 934 935 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode) 936 { 937 write_seqlock(&state->seqlock); 938 nfs_set_open_stateid_locked(state, stateid, fmode); 939 write_sequnlock(&state->seqlock); 940 } 941 942 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode) 943 { 944 /* 945 * Protect the call to nfs4_state_set_mode_locked and 946 * serialise the stateid update 947 */ 948 write_seqlock(&state->seqlock); 949 if (deleg_stateid != NULL) { 950 nfs4_stateid_copy(&state->stateid, deleg_stateid); 951 set_bit(NFS_DELEGATED_STATE, &state->flags); 952 } 953 if (open_stateid != NULL) 954 nfs_set_open_stateid_locked(state, open_stateid, fmode); 955 write_sequnlock(&state->seqlock); 956 spin_lock(&state->owner->so_lock); 957 update_open_stateflags(state, fmode); 958 spin_unlock(&state->owner->so_lock); 959 } 960 961 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode) 962 { 963 struct nfs_inode *nfsi = NFS_I(state->inode); 964 struct nfs_delegation *deleg_cur; 965 int ret = 0; 966 967 fmode &= (FMODE_READ|FMODE_WRITE); 968 969 rcu_read_lock(); 970 deleg_cur = rcu_dereference(nfsi->delegation); 971 if (deleg_cur == NULL) 972 goto no_delegation; 973 974 spin_lock(&deleg_cur->lock); 975 if (nfsi->delegation != deleg_cur || 976 (deleg_cur->type & fmode) != fmode) 977 goto no_delegation_unlock; 978 979 if (delegation == NULL) 980 delegation = &deleg_cur->stateid; 981 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) 982 goto no_delegation_unlock; 983 984 nfs_mark_delegation_referenced(deleg_cur); 985 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode); 986 ret = 1; 987 no_delegation_unlock: 988 spin_unlock(&deleg_cur->lock); 989 no_delegation: 990 rcu_read_unlock(); 991 992 if (!ret && open_stateid != NULL) { 993 __update_open_stateid(state, open_stateid, NULL, fmode); 994 ret = 1; 995 } 996 997 return ret; 998 } 999 1000 1001 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1002 { 1003 struct nfs_delegation *delegation; 1004 1005 rcu_read_lock(); 1006 delegation = rcu_dereference(NFS_I(inode)->delegation); 1007 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1008 rcu_read_unlock(); 1009 return; 1010 } 1011 rcu_read_unlock(); 1012 nfs4_inode_return_delegation(inode); 1013 } 1014 1015 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1016 { 1017 struct nfs4_state *state = opendata->state; 1018 struct nfs_inode *nfsi = NFS_I(state->inode); 1019 struct nfs_delegation *delegation; 1020 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC); 1021 fmode_t fmode = opendata->o_arg.fmode; 1022 nfs4_stateid stateid; 1023 int ret = -EAGAIN; 1024 1025 for (;;) { 1026 if (can_open_cached(state, fmode, open_mode)) { 1027 spin_lock(&state->owner->so_lock); 1028 if (can_open_cached(state, fmode, open_mode)) { 1029 update_open_stateflags(state, fmode); 1030 spin_unlock(&state->owner->so_lock); 1031 goto out_return_state; 1032 } 1033 spin_unlock(&state->owner->so_lock); 1034 } 1035 rcu_read_lock(); 1036 delegation = rcu_dereference(nfsi->delegation); 1037 if (!can_open_delegated(delegation, fmode)) { 1038 rcu_read_unlock(); 1039 break; 1040 } 1041 /* Save the delegation */ 1042 nfs4_stateid_copy(&stateid, &delegation->stateid); 1043 rcu_read_unlock(); 1044 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1045 if (ret != 0) 1046 goto out; 1047 ret = -EAGAIN; 1048 1049 /* Try to update the stateid using the delegation */ 1050 if (update_open_stateid(state, NULL, &stateid, fmode)) 1051 goto out_return_state; 1052 } 1053 out: 1054 return ERR_PTR(ret); 1055 out_return_state: 1056 atomic_inc(&state->count); 1057 return state; 1058 } 1059 1060 static void 1061 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1062 { 1063 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1064 struct nfs_delegation *delegation; 1065 int delegation_flags = 0; 1066 1067 rcu_read_lock(); 1068 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1069 if (delegation) 1070 delegation_flags = delegation->flags; 1071 rcu_read_unlock(); 1072 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) { 1073 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1074 "returning a delegation for " 1075 "OPEN(CLAIM_DELEGATE_CUR)\n", 1076 clp->cl_hostname); 1077 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1078 nfs_inode_set_delegation(state->inode, 1079 data->owner->so_cred, 1080 &data->o_res); 1081 else 1082 nfs_inode_reclaim_delegation(state->inode, 1083 data->owner->so_cred, 1084 &data->o_res); 1085 } 1086 1087 /* 1088 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1089 * and update the nfs4_state. 1090 */ 1091 static struct nfs4_state * 1092 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1093 { 1094 struct inode *inode = data->state->inode; 1095 struct nfs4_state *state = data->state; 1096 int ret; 1097 1098 if (!data->rpc_done) { 1099 ret = data->rpc_status; 1100 goto err; 1101 } 1102 1103 ret = -ESTALE; 1104 if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) || 1105 !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) || 1106 !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE)) 1107 goto err; 1108 1109 ret = -ENOMEM; 1110 state = nfs4_get_open_state(inode, data->owner); 1111 if (state == NULL) 1112 goto err; 1113 1114 ret = nfs_refresh_inode(inode, &data->f_attr); 1115 if (ret) 1116 goto err; 1117 1118 if (data->o_res.delegation_type != 0) 1119 nfs4_opendata_check_deleg(data, state); 1120 update_open_stateid(state, &data->o_res.stateid, NULL, 1121 data->o_arg.fmode); 1122 1123 return state; 1124 err: 1125 return ERR_PTR(ret); 1126 1127 } 1128 1129 static struct nfs4_state * 1130 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1131 { 1132 struct inode *inode; 1133 struct nfs4_state *state = NULL; 1134 int ret; 1135 1136 if (!data->rpc_done) { 1137 state = nfs4_try_open_cached(data); 1138 goto out; 1139 } 1140 1141 ret = -EAGAIN; 1142 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 1143 goto err; 1144 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr); 1145 ret = PTR_ERR(inode); 1146 if (IS_ERR(inode)) 1147 goto err; 1148 ret = -ENOMEM; 1149 state = nfs4_get_open_state(inode, data->owner); 1150 if (state == NULL) 1151 goto err_put_inode; 1152 if (data->o_res.delegation_type != 0) 1153 nfs4_opendata_check_deleg(data, state); 1154 update_open_stateid(state, &data->o_res.stateid, NULL, 1155 data->o_arg.fmode); 1156 iput(inode); 1157 out: 1158 return state; 1159 err_put_inode: 1160 iput(inode); 1161 err: 1162 return ERR_PTR(ret); 1163 } 1164 1165 static struct nfs4_state * 1166 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 1167 { 1168 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 1169 return _nfs4_opendata_reclaim_to_nfs4_state(data); 1170 return _nfs4_opendata_to_nfs4_state(data); 1171 } 1172 1173 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 1174 { 1175 struct nfs_inode *nfsi = NFS_I(state->inode); 1176 struct nfs_open_context *ctx; 1177 1178 spin_lock(&state->inode->i_lock); 1179 list_for_each_entry(ctx, &nfsi->open_files, list) { 1180 if (ctx->state != state) 1181 continue; 1182 get_nfs_open_context(ctx); 1183 spin_unlock(&state->inode->i_lock); 1184 return ctx; 1185 } 1186 spin_unlock(&state->inode->i_lock); 1187 return ERR_PTR(-ENOENT); 1188 } 1189 1190 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state) 1191 { 1192 struct nfs4_opendata *opendata; 1193 1194 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS); 1195 if (opendata == NULL) 1196 return ERR_PTR(-ENOMEM); 1197 opendata->state = state; 1198 atomic_inc(&state->count); 1199 return opendata; 1200 } 1201 1202 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res) 1203 { 1204 struct nfs4_state *newstate; 1205 int ret; 1206 1207 opendata->o_arg.open_flags = 0; 1208 opendata->o_arg.fmode = fmode; 1209 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 1210 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 1211 nfs4_init_opendata_res(opendata); 1212 ret = _nfs4_recover_proc_open(opendata); 1213 if (ret != 0) 1214 return ret; 1215 newstate = nfs4_opendata_to_nfs4_state(opendata); 1216 if (IS_ERR(newstate)) 1217 return PTR_ERR(newstate); 1218 nfs4_close_state(newstate, fmode); 1219 *res = newstate; 1220 return 0; 1221 } 1222 1223 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 1224 { 1225 struct nfs4_state *newstate; 1226 int ret; 1227 1228 /* memory barrier prior to reading state->n_* */ 1229 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1230 smp_rmb(); 1231 if (state->n_rdwr != 0) { 1232 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1233 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate); 1234 if (ret != 0) 1235 return ret; 1236 if (newstate != state) 1237 return -ESTALE; 1238 } 1239 if (state->n_wronly != 0) { 1240 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1241 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate); 1242 if (ret != 0) 1243 return ret; 1244 if (newstate != state) 1245 return -ESTALE; 1246 } 1247 if (state->n_rdonly != 0) { 1248 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1249 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate); 1250 if (ret != 0) 1251 return ret; 1252 if (newstate != state) 1253 return -ESTALE; 1254 } 1255 /* 1256 * We may have performed cached opens for all three recoveries. 1257 * Check if we need to update the current stateid. 1258 */ 1259 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 1260 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 1261 write_seqlock(&state->seqlock); 1262 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1263 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1264 write_sequnlock(&state->seqlock); 1265 } 1266 return 0; 1267 } 1268 1269 /* 1270 * OPEN_RECLAIM: 1271 * reclaim state on the server after a reboot. 1272 */ 1273 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1274 { 1275 struct nfs_delegation *delegation; 1276 struct nfs4_opendata *opendata; 1277 fmode_t delegation_type = 0; 1278 int status; 1279 1280 opendata = nfs4_open_recoverdata_alloc(ctx, state); 1281 if (IS_ERR(opendata)) 1282 return PTR_ERR(opendata); 1283 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS; 1284 opendata->o_arg.fh = NFS_FH(state->inode); 1285 rcu_read_lock(); 1286 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1287 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 1288 delegation_type = delegation->type; 1289 rcu_read_unlock(); 1290 opendata->o_arg.u.delegation_type = delegation_type; 1291 status = nfs4_open_recover(opendata, state); 1292 nfs4_opendata_put(opendata); 1293 return status; 1294 } 1295 1296 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 1297 { 1298 struct nfs_server *server = NFS_SERVER(state->inode); 1299 struct nfs4_exception exception = { }; 1300 int err; 1301 do { 1302 err = _nfs4_do_open_reclaim(ctx, state); 1303 if (err != -NFS4ERR_DELAY) 1304 break; 1305 nfs4_handle_exception(server, err, &exception); 1306 } while (exception.retry); 1307 return err; 1308 } 1309 1310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 1311 { 1312 struct nfs_open_context *ctx; 1313 int ret; 1314 1315 ctx = nfs4_state_find_open_context(state); 1316 if (IS_ERR(ctx)) 1317 return PTR_ERR(ctx); 1318 ret = nfs4_do_open_reclaim(ctx, state); 1319 put_nfs_open_context(ctx); 1320 return ret; 1321 } 1322 1323 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 1324 { 1325 struct nfs4_opendata *opendata; 1326 int ret; 1327 1328 opendata = nfs4_open_recoverdata_alloc(ctx, state); 1329 if (IS_ERR(opendata)) 1330 return PTR_ERR(opendata); 1331 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR; 1332 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 1333 ret = nfs4_open_recover(opendata, state); 1334 nfs4_opendata_put(opendata); 1335 return ret; 1336 } 1337 1338 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 1339 { 1340 struct nfs4_exception exception = { }; 1341 struct nfs_server *server = NFS_SERVER(state->inode); 1342 int err; 1343 do { 1344 err = _nfs4_open_delegation_recall(ctx, state, stateid); 1345 switch (err) { 1346 case 0: 1347 case -ENOENT: 1348 case -ESTALE: 1349 goto out; 1350 case -NFS4ERR_BADSESSION: 1351 case -NFS4ERR_BADSLOT: 1352 case -NFS4ERR_BAD_HIGH_SLOT: 1353 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1354 case -NFS4ERR_DEADSESSION: 1355 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 1356 goto out; 1357 case -NFS4ERR_STALE_CLIENTID: 1358 case -NFS4ERR_STALE_STATEID: 1359 case -NFS4ERR_EXPIRED: 1360 /* Don't recall a delegation if it was lost */ 1361 nfs4_schedule_lease_recovery(server->nfs_client); 1362 goto out; 1363 case -ERESTARTSYS: 1364 /* 1365 * The show must go on: exit, but mark the 1366 * stateid as needing recovery. 1367 */ 1368 case -NFS4ERR_DELEG_REVOKED: 1369 case -NFS4ERR_ADMIN_REVOKED: 1370 case -NFS4ERR_BAD_STATEID: 1371 nfs_inode_find_state_and_recover(state->inode, 1372 stateid); 1373 nfs4_schedule_stateid_recovery(server, state); 1374 case -ENOMEM: 1375 err = 0; 1376 goto out; 1377 } 1378 err = nfs4_handle_exception(server, err, &exception); 1379 } while (exception.retry); 1380 out: 1381 return err; 1382 } 1383 1384 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 1385 { 1386 struct nfs4_opendata *data = calldata; 1387 1388 data->rpc_status = task->tk_status; 1389 if (data->rpc_status == 0) { 1390 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 1391 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1392 renew_lease(data->o_res.server, data->timestamp); 1393 data->rpc_done = 1; 1394 } 1395 } 1396 1397 static void nfs4_open_confirm_release(void *calldata) 1398 { 1399 struct nfs4_opendata *data = calldata; 1400 struct nfs4_state *state = NULL; 1401 1402 /* If this request hasn't been cancelled, do nothing */ 1403 if (data->cancelled == 0) 1404 goto out_free; 1405 /* In case of error, no cleanup! */ 1406 if (!data->rpc_done) 1407 goto out_free; 1408 state = nfs4_opendata_to_nfs4_state(data); 1409 if (!IS_ERR(state)) 1410 nfs4_close_state(state, data->o_arg.fmode); 1411 out_free: 1412 nfs4_opendata_put(data); 1413 } 1414 1415 static const struct rpc_call_ops nfs4_open_confirm_ops = { 1416 .rpc_call_done = nfs4_open_confirm_done, 1417 .rpc_release = nfs4_open_confirm_release, 1418 }; 1419 1420 /* 1421 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 1422 */ 1423 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 1424 { 1425 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 1426 struct rpc_task *task; 1427 struct rpc_message msg = { 1428 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 1429 .rpc_argp = &data->c_arg, 1430 .rpc_resp = &data->c_res, 1431 .rpc_cred = data->owner->so_cred, 1432 }; 1433 struct rpc_task_setup task_setup_data = { 1434 .rpc_client = server->client, 1435 .rpc_message = &msg, 1436 .callback_ops = &nfs4_open_confirm_ops, 1437 .callback_data = data, 1438 .workqueue = nfsiod_workqueue, 1439 .flags = RPC_TASK_ASYNC, 1440 }; 1441 int status; 1442 1443 kref_get(&data->kref); 1444 data->rpc_done = 0; 1445 data->rpc_status = 0; 1446 data->timestamp = jiffies; 1447 task = rpc_run_task(&task_setup_data); 1448 if (IS_ERR(task)) 1449 return PTR_ERR(task); 1450 status = nfs4_wait_for_completion_rpc_task(task); 1451 if (status != 0) { 1452 data->cancelled = 1; 1453 smp_wmb(); 1454 } else 1455 status = data->rpc_status; 1456 rpc_put_task(task); 1457 return status; 1458 } 1459 1460 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 1461 { 1462 struct nfs4_opendata *data = calldata; 1463 struct nfs4_state_owner *sp = data->owner; 1464 1465 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 1466 return; 1467 /* 1468 * Check if we still need to send an OPEN call, or if we can use 1469 * a delegation instead. 1470 */ 1471 if (data->state != NULL) { 1472 struct nfs_delegation *delegation; 1473 1474 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) 1475 goto out_no_action; 1476 rcu_read_lock(); 1477 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 1478 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR && 1479 can_open_delegated(delegation, data->o_arg.fmode)) 1480 goto unlock_no_action; 1481 rcu_read_unlock(); 1482 } 1483 /* Update client id. */ 1484 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid; 1485 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) { 1486 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 1487 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 1488 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 1489 } 1490 data->timestamp = jiffies; 1491 if (nfs4_setup_sequence(data->o_arg.server, 1492 &data->o_arg.seq_args, 1493 &data->o_res.seq_res, 1494 task) != 0) 1495 nfs_release_seqid(data->o_arg.seqid); 1496 return; 1497 unlock_no_action: 1498 rcu_read_unlock(); 1499 out_no_action: 1500 task->tk_action = NULL; 1501 nfs4_sequence_done(task, &data->o_res.seq_res); 1502 } 1503 1504 static void nfs4_open_done(struct rpc_task *task, void *calldata) 1505 { 1506 struct nfs4_opendata *data = calldata; 1507 1508 data->rpc_status = task->tk_status; 1509 1510 if (!nfs4_sequence_done(task, &data->o_res.seq_res)) 1511 return; 1512 1513 if (task->tk_status == 0) { 1514 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 1515 switch (data->o_res.f_attr->mode & S_IFMT) { 1516 case S_IFREG: 1517 break; 1518 case S_IFLNK: 1519 data->rpc_status = -ELOOP; 1520 break; 1521 case S_IFDIR: 1522 data->rpc_status = -EISDIR; 1523 break; 1524 default: 1525 data->rpc_status = -ENOTDIR; 1526 } 1527 } 1528 renew_lease(data->o_res.server, data->timestamp); 1529 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 1530 nfs_confirm_seqid(&data->owner->so_seqid, 0); 1531 } 1532 data->rpc_done = 1; 1533 } 1534 1535 static void nfs4_open_release(void *calldata) 1536 { 1537 struct nfs4_opendata *data = calldata; 1538 struct nfs4_state *state = NULL; 1539 1540 /* If this request hasn't been cancelled, do nothing */ 1541 if (data->cancelled == 0) 1542 goto out_free; 1543 /* In case of error, no cleanup! */ 1544 if (data->rpc_status != 0 || !data->rpc_done) 1545 goto out_free; 1546 /* In case we need an open_confirm, no cleanup! */ 1547 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 1548 goto out_free; 1549 state = nfs4_opendata_to_nfs4_state(data); 1550 if (!IS_ERR(state)) 1551 nfs4_close_state(state, data->o_arg.fmode); 1552 out_free: 1553 nfs4_opendata_put(data); 1554 } 1555 1556 static const struct rpc_call_ops nfs4_open_ops = { 1557 .rpc_call_prepare = nfs4_open_prepare, 1558 .rpc_call_done = nfs4_open_done, 1559 .rpc_release = nfs4_open_release, 1560 }; 1561 1562 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) 1563 { 1564 struct inode *dir = data->dir->d_inode; 1565 struct nfs_server *server = NFS_SERVER(dir); 1566 struct nfs_openargs *o_arg = &data->o_arg; 1567 struct nfs_openres *o_res = &data->o_res; 1568 struct rpc_task *task; 1569 struct rpc_message msg = { 1570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 1571 .rpc_argp = o_arg, 1572 .rpc_resp = o_res, 1573 .rpc_cred = data->owner->so_cred, 1574 }; 1575 struct rpc_task_setup task_setup_data = { 1576 .rpc_client = server->client, 1577 .rpc_message = &msg, 1578 .callback_ops = &nfs4_open_ops, 1579 .callback_data = data, 1580 .workqueue = nfsiod_workqueue, 1581 .flags = RPC_TASK_ASYNC, 1582 }; 1583 int status; 1584 1585 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); 1586 kref_get(&data->kref); 1587 data->rpc_done = 0; 1588 data->rpc_status = 0; 1589 data->cancelled = 0; 1590 if (isrecover) 1591 nfs4_set_sequence_privileged(&o_arg->seq_args); 1592 task = rpc_run_task(&task_setup_data); 1593 if (IS_ERR(task)) 1594 return PTR_ERR(task); 1595 status = nfs4_wait_for_completion_rpc_task(task); 1596 if (status != 0) { 1597 data->cancelled = 1; 1598 smp_wmb(); 1599 } else 1600 status = data->rpc_status; 1601 rpc_put_task(task); 1602 1603 return status; 1604 } 1605 1606 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 1607 { 1608 struct inode *dir = data->dir->d_inode; 1609 struct nfs_openres *o_res = &data->o_res; 1610 int status; 1611 1612 status = nfs4_run_open_task(data, 1); 1613 if (status != 0 || !data->rpc_done) 1614 return status; 1615 1616 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 1617 1618 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 1619 status = _nfs4_proc_open_confirm(data); 1620 if (status != 0) 1621 return status; 1622 } 1623 1624 return status; 1625 } 1626 1627 static int nfs4_opendata_access(struct rpc_cred *cred, 1628 struct nfs4_opendata *opendata, 1629 struct nfs4_state *state, fmode_t fmode) 1630 { 1631 struct nfs_access_entry cache; 1632 u32 mask; 1633 1634 /* access call failed or for some reason the server doesn't 1635 * support any access modes -- defer access call until later */ 1636 if (opendata->o_res.access_supported == 0) 1637 return 0; 1638 1639 mask = 0; 1640 /* don't check MAY_WRITE - a newly created file may not have 1641 * write mode bits, but POSIX allows the creating process to write */ 1642 if (fmode & FMODE_READ) 1643 mask |= MAY_READ; 1644 if (fmode & FMODE_EXEC) 1645 mask |= MAY_EXEC; 1646 1647 cache.cred = cred; 1648 cache.jiffies = jiffies; 1649 nfs_access_set_mask(&cache, opendata->o_res.access_result); 1650 nfs_access_add_cache(state->inode, &cache); 1651 1652 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0) 1653 return 0; 1654 1655 /* even though OPEN succeeded, access is denied. Close the file */ 1656 nfs4_close_state(state, fmode); 1657 return -EACCES; 1658 } 1659 1660 /* 1661 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 1662 */ 1663 static int _nfs4_proc_open(struct nfs4_opendata *data) 1664 { 1665 struct inode *dir = data->dir->d_inode; 1666 struct nfs_server *server = NFS_SERVER(dir); 1667 struct nfs_openargs *o_arg = &data->o_arg; 1668 struct nfs_openres *o_res = &data->o_res; 1669 int status; 1670 1671 status = nfs4_run_open_task(data, 0); 1672 if (!data->rpc_done) 1673 return status; 1674 if (status != 0) { 1675 if (status == -NFS4ERR_BADNAME && 1676 !(o_arg->open_flags & O_CREAT)) 1677 return -ENOENT; 1678 return status; 1679 } 1680 1681 nfs_fattr_map_and_free_names(server, &data->f_attr); 1682 1683 if (o_arg->open_flags & O_CREAT) 1684 update_changeattr(dir, &o_res->cinfo); 1685 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 1686 server->caps &= ~NFS_CAP_POSIX_LOCK; 1687 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 1688 status = _nfs4_proc_open_confirm(data); 1689 if (status != 0) 1690 return status; 1691 } 1692 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 1693 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr); 1694 return 0; 1695 } 1696 1697 static int nfs4_recover_expired_lease(struct nfs_server *server) 1698 { 1699 return nfs4_client_recover_expired_lease(server->nfs_client); 1700 } 1701 1702 /* 1703 * OPEN_EXPIRED: 1704 * reclaim state on the server after a network partition. 1705 * Assumes caller holds the appropriate lock 1706 */ 1707 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 1708 { 1709 struct nfs4_opendata *opendata; 1710 int ret; 1711 1712 opendata = nfs4_open_recoverdata_alloc(ctx, state); 1713 if (IS_ERR(opendata)) 1714 return PTR_ERR(opendata); 1715 ret = nfs4_open_recover(opendata, state); 1716 if (ret == -ESTALE) 1717 d_drop(ctx->dentry); 1718 nfs4_opendata_put(opendata); 1719 return ret; 1720 } 1721 1722 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 1723 { 1724 struct nfs_server *server = NFS_SERVER(state->inode); 1725 struct nfs4_exception exception = { }; 1726 int err; 1727 1728 do { 1729 err = _nfs4_open_expired(ctx, state); 1730 switch (err) { 1731 default: 1732 goto out; 1733 case -NFS4ERR_GRACE: 1734 case -NFS4ERR_DELAY: 1735 nfs4_handle_exception(server, err, &exception); 1736 err = 0; 1737 } 1738 } while (exception.retry); 1739 out: 1740 return err; 1741 } 1742 1743 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 1744 { 1745 struct nfs_open_context *ctx; 1746 int ret; 1747 1748 ctx = nfs4_state_find_open_context(state); 1749 if (IS_ERR(ctx)) 1750 return PTR_ERR(ctx); 1751 ret = nfs4_do_open_expired(ctx, state); 1752 put_nfs_open_context(ctx); 1753 return ret; 1754 } 1755 1756 #if defined(CONFIG_NFS_V4_1) 1757 static void nfs41_clear_delegation_stateid(struct nfs4_state *state) 1758 { 1759 struct nfs_server *server = NFS_SERVER(state->inode); 1760 nfs4_stateid *stateid = &state->stateid; 1761 int status; 1762 1763 /* If a state reset has been done, test_stateid is unneeded */ 1764 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1765 return; 1766 1767 status = nfs41_test_stateid(server, stateid); 1768 if (status != NFS_OK) { 1769 /* Free the stateid unless the server explicitly 1770 * informs us the stateid is unrecognized. */ 1771 if (status != -NFS4ERR_BAD_STATEID) 1772 nfs41_free_stateid(server, stateid); 1773 nfs_remove_bad_delegation(state->inode); 1774 1775 write_seqlock(&state->seqlock); 1776 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1777 write_sequnlock(&state->seqlock); 1778 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1779 } 1780 } 1781 1782 /** 1783 * nfs41_check_open_stateid - possibly free an open stateid 1784 * 1785 * @state: NFSv4 state for an inode 1786 * 1787 * Returns NFS_OK if recovery for this stateid is now finished. 1788 * Otherwise a negative NFS4ERR value is returned. 1789 */ 1790 static int nfs41_check_open_stateid(struct nfs4_state *state) 1791 { 1792 struct nfs_server *server = NFS_SERVER(state->inode); 1793 nfs4_stateid *stateid = &state->open_stateid; 1794 int status; 1795 1796 /* If a state reset has been done, test_stateid is unneeded */ 1797 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && 1798 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && 1799 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) 1800 return -NFS4ERR_BAD_STATEID; 1801 1802 status = nfs41_test_stateid(server, stateid); 1803 if (status != NFS_OK) { 1804 /* Free the stateid unless the server explicitly 1805 * informs us the stateid is unrecognized. */ 1806 if (status != -NFS4ERR_BAD_STATEID) 1807 nfs41_free_stateid(server, stateid); 1808 1809 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1810 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1811 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1812 } 1813 return status; 1814 } 1815 1816 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 1817 { 1818 int status; 1819 1820 nfs41_clear_delegation_stateid(state); 1821 status = nfs41_check_open_stateid(state); 1822 if (status != NFS_OK) 1823 status = nfs4_open_expired(sp, state); 1824 return status; 1825 } 1826 #endif 1827 1828 /* 1829 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 1830 * fields corresponding to attributes that were used to store the verifier. 1831 * Make sure we clobber those fields in the later setattr call 1832 */ 1833 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 1834 { 1835 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 1836 !(sattr->ia_valid & ATTR_ATIME_SET)) 1837 sattr->ia_valid |= ATTR_ATIME; 1838 1839 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 1840 !(sattr->ia_valid & ATTR_MTIME_SET)) 1841 sattr->ia_valid |= ATTR_MTIME; 1842 } 1843 1844 /* 1845 * Returns a referenced nfs4_state 1846 */ 1847 static int _nfs4_do_open(struct inode *dir, 1848 struct dentry *dentry, 1849 fmode_t fmode, 1850 int flags, 1851 struct iattr *sattr, 1852 struct rpc_cred *cred, 1853 struct nfs4_state **res, 1854 struct nfs4_threshold **ctx_th) 1855 { 1856 struct nfs4_state_owner *sp; 1857 struct nfs4_state *state = NULL; 1858 struct nfs_server *server = NFS_SERVER(dir); 1859 struct nfs4_opendata *opendata; 1860 int status; 1861 1862 /* Protect against reboot recovery conflicts */ 1863 status = -ENOMEM; 1864 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 1865 if (sp == NULL) { 1866 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 1867 goto out_err; 1868 } 1869 status = nfs4_recover_expired_lease(server); 1870 if (status != 0) 1871 goto err_put_state_owner; 1872 if (dentry->d_inode != NULL) 1873 nfs4_return_incompatible_delegation(dentry->d_inode, fmode); 1874 status = -ENOMEM; 1875 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL); 1876 if (opendata == NULL) 1877 goto err_put_state_owner; 1878 1879 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 1880 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 1881 if (!opendata->f_attr.mdsthreshold) 1882 goto err_opendata_put; 1883 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 1884 } 1885 if (dentry->d_inode != NULL) 1886 opendata->state = nfs4_get_open_state(dentry->d_inode, sp); 1887 1888 status = _nfs4_proc_open(opendata); 1889 if (status != 0) 1890 goto err_opendata_put; 1891 1892 state = nfs4_opendata_to_nfs4_state(opendata); 1893 status = PTR_ERR(state); 1894 if (IS_ERR(state)) 1895 goto err_opendata_put; 1896 if (server->caps & NFS_CAP_POSIX_LOCK) 1897 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 1898 1899 status = nfs4_opendata_access(cred, opendata, state, fmode); 1900 if (status != 0) 1901 goto err_opendata_put; 1902 1903 if (opendata->o_arg.open_flags & O_EXCL) { 1904 nfs4_exclusive_attrset(opendata, sattr); 1905 1906 nfs_fattr_init(opendata->o_res.f_attr); 1907 status = nfs4_do_setattr(state->inode, cred, 1908 opendata->o_res.f_attr, sattr, 1909 state); 1910 if (status == 0) 1911 nfs_setattr_update_inode(state->inode, sattr); 1912 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr); 1913 } 1914 1915 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) 1916 *ctx_th = opendata->f_attr.mdsthreshold; 1917 else 1918 kfree(opendata->f_attr.mdsthreshold); 1919 opendata->f_attr.mdsthreshold = NULL; 1920 1921 nfs4_opendata_put(opendata); 1922 nfs4_put_state_owner(sp); 1923 *res = state; 1924 return 0; 1925 err_opendata_put: 1926 kfree(opendata->f_attr.mdsthreshold); 1927 nfs4_opendata_put(opendata); 1928 err_put_state_owner: 1929 nfs4_put_state_owner(sp); 1930 out_err: 1931 *res = NULL; 1932 return status; 1933 } 1934 1935 1936 static struct nfs4_state *nfs4_do_open(struct inode *dir, 1937 struct dentry *dentry, 1938 fmode_t fmode, 1939 int flags, 1940 struct iattr *sattr, 1941 struct rpc_cred *cred, 1942 struct nfs4_threshold **ctx_th) 1943 { 1944 struct nfs4_exception exception = { }; 1945 struct nfs4_state *res; 1946 int status; 1947 1948 fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC; 1949 do { 1950 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, 1951 &res, ctx_th); 1952 if (status == 0) 1953 break; 1954 /* NOTE: BAD_SEQID means the server and client disagree about the 1955 * book-keeping w.r.t. state-changing operations 1956 * (OPEN/CLOSE/LOCK/LOCKU...) 1957 * It is actually a sign of a bug on the client or on the server. 1958 * 1959 * If we receive a BAD_SEQID error in the particular case of 1960 * doing an OPEN, we assume that nfs_increment_open_seqid() will 1961 * have unhashed the old state_owner for us, and that we can 1962 * therefore safely retry using a new one. We should still warn 1963 * the user though... 1964 */ 1965 if (status == -NFS4ERR_BAD_SEQID) { 1966 pr_warn_ratelimited("NFS: v4 server %s " 1967 " returned a bad sequence-id error!\n", 1968 NFS_SERVER(dir)->nfs_client->cl_hostname); 1969 exception.retry = 1; 1970 continue; 1971 } 1972 /* 1973 * BAD_STATEID on OPEN means that the server cancelled our 1974 * state before it received the OPEN_CONFIRM. 1975 * Recover by retrying the request as per the discussion 1976 * on Page 181 of RFC3530. 1977 */ 1978 if (status == -NFS4ERR_BAD_STATEID) { 1979 exception.retry = 1; 1980 continue; 1981 } 1982 if (status == -EAGAIN) { 1983 /* We must have found a delegation */ 1984 exception.retry = 1; 1985 continue; 1986 } 1987 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), 1988 status, &exception)); 1989 } while (exception.retry); 1990 return res; 1991 } 1992 1993 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 1994 struct nfs_fattr *fattr, struct iattr *sattr, 1995 struct nfs4_state *state) 1996 { 1997 struct nfs_server *server = NFS_SERVER(inode); 1998 struct nfs_setattrargs arg = { 1999 .fh = NFS_FH(inode), 2000 .iap = sattr, 2001 .server = server, 2002 .bitmask = server->attr_bitmask, 2003 }; 2004 struct nfs_setattrres res = { 2005 .fattr = fattr, 2006 .server = server, 2007 }; 2008 struct rpc_message msg = { 2009 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 2010 .rpc_argp = &arg, 2011 .rpc_resp = &res, 2012 .rpc_cred = cred, 2013 }; 2014 unsigned long timestamp = jiffies; 2015 int status; 2016 2017 nfs_fattr_init(fattr); 2018 2019 if (state != NULL) { 2020 struct nfs_lockowner lockowner = { 2021 .l_owner = current->files, 2022 .l_pid = current->tgid, 2023 }; 2024 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE, 2025 &lockowner); 2026 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode, 2027 FMODE_WRITE)) { 2028 /* Use that stateid */ 2029 } else 2030 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 2031 2032 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 2033 if (status == 0 && state != NULL) 2034 renew_lease(server, timestamp); 2035 return status; 2036 } 2037 2038 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 2039 struct nfs_fattr *fattr, struct iattr *sattr, 2040 struct nfs4_state *state) 2041 { 2042 struct nfs_server *server = NFS_SERVER(inode); 2043 struct nfs4_exception exception = { 2044 .state = state, 2045 .inode = inode, 2046 }; 2047 int err; 2048 do { 2049 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state); 2050 switch (err) { 2051 case -NFS4ERR_OPENMODE: 2052 if (state && !(state->state & FMODE_WRITE)) { 2053 err = -EBADF; 2054 if (sattr->ia_valid & ATTR_OPEN) 2055 err = -EACCES; 2056 goto out; 2057 } 2058 } 2059 err = nfs4_handle_exception(server, err, &exception); 2060 } while (exception.retry); 2061 out: 2062 return err; 2063 } 2064 2065 struct nfs4_closedata { 2066 struct inode *inode; 2067 struct nfs4_state *state; 2068 struct nfs_closeargs arg; 2069 struct nfs_closeres res; 2070 struct nfs_fattr fattr; 2071 unsigned long timestamp; 2072 bool roc; 2073 u32 roc_barrier; 2074 }; 2075 2076 static void nfs4_free_closedata(void *data) 2077 { 2078 struct nfs4_closedata *calldata = data; 2079 struct nfs4_state_owner *sp = calldata->state->owner; 2080 struct super_block *sb = calldata->state->inode->i_sb; 2081 2082 if (calldata->roc) 2083 pnfs_roc_release(calldata->state->inode); 2084 nfs4_put_open_state(calldata->state); 2085 nfs_free_seqid(calldata->arg.seqid); 2086 nfs4_put_state_owner(sp); 2087 nfs_sb_deactive_async(sb); 2088 kfree(calldata); 2089 } 2090 2091 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state, 2092 fmode_t fmode) 2093 { 2094 spin_lock(&state->owner->so_lock); 2095 if (!(fmode & FMODE_READ)) 2096 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 2097 if (!(fmode & FMODE_WRITE)) 2098 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 2099 clear_bit(NFS_O_RDWR_STATE, &state->flags); 2100 spin_unlock(&state->owner->so_lock); 2101 } 2102 2103 static void nfs4_close_done(struct rpc_task *task, void *data) 2104 { 2105 struct nfs4_closedata *calldata = data; 2106 struct nfs4_state *state = calldata->state; 2107 struct nfs_server *server = NFS_SERVER(calldata->inode); 2108 2109 dprintk("%s: begin!\n", __func__); 2110 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 2111 return; 2112 /* hmm. we are done with the inode, and in the process of freeing 2113 * the state_owner. we keep this around to process errors 2114 */ 2115 switch (task->tk_status) { 2116 case 0: 2117 if (calldata->roc) 2118 pnfs_roc_set_barrier(state->inode, 2119 calldata->roc_barrier); 2120 nfs_set_open_stateid(state, &calldata->res.stateid, 0); 2121 renew_lease(server, calldata->timestamp); 2122 nfs4_close_clear_stateid_flags(state, 2123 calldata->arg.fmode); 2124 break; 2125 case -NFS4ERR_STALE_STATEID: 2126 case -NFS4ERR_OLD_STATEID: 2127 case -NFS4ERR_BAD_STATEID: 2128 case -NFS4ERR_EXPIRED: 2129 if (calldata->arg.fmode == 0) 2130 break; 2131 default: 2132 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) 2133 rpc_restart_call_prepare(task); 2134 } 2135 nfs_release_seqid(calldata->arg.seqid); 2136 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 2137 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status); 2138 } 2139 2140 static void nfs4_close_prepare(struct rpc_task *task, void *data) 2141 { 2142 struct nfs4_closedata *calldata = data; 2143 struct nfs4_state *state = calldata->state; 2144 struct inode *inode = calldata->inode; 2145 int call_close = 0; 2146 2147 dprintk("%s: begin!\n", __func__); 2148 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 2149 return; 2150 2151 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 2152 calldata->arg.fmode = FMODE_READ|FMODE_WRITE; 2153 spin_lock(&state->owner->so_lock); 2154 /* Calculate the change in open mode */ 2155 if (state->n_rdwr == 0) { 2156 if (state->n_rdonly == 0) { 2157 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); 2158 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2159 calldata->arg.fmode &= ~FMODE_READ; 2160 } 2161 if (state->n_wronly == 0) { 2162 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); 2163 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 2164 calldata->arg.fmode &= ~FMODE_WRITE; 2165 } 2166 } 2167 spin_unlock(&state->owner->so_lock); 2168 2169 if (!call_close) { 2170 /* Note: exit _without_ calling nfs4_close_done */ 2171 task->tk_action = NULL; 2172 nfs4_sequence_done(task, &calldata->res.seq_res); 2173 goto out; 2174 } 2175 2176 if (calldata->arg.fmode == 0) { 2177 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 2178 if (calldata->roc && 2179 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) 2180 goto out; 2181 } 2182 2183 nfs_fattr_init(calldata->res.fattr); 2184 calldata->timestamp = jiffies; 2185 if (nfs4_setup_sequence(NFS_SERVER(inode), 2186 &calldata->arg.seq_args, 2187 &calldata->res.seq_res, 2188 task) != 0) 2189 nfs_release_seqid(calldata->arg.seqid); 2190 out: 2191 dprintk("%s: done!\n", __func__); 2192 } 2193 2194 static const struct rpc_call_ops nfs4_close_ops = { 2195 .rpc_call_prepare = nfs4_close_prepare, 2196 .rpc_call_done = nfs4_close_done, 2197 .rpc_release = nfs4_free_closedata, 2198 }; 2199 2200 /* 2201 * It is possible for data to be read/written from a mem-mapped file 2202 * after the sys_close call (which hits the vfs layer as a flush). 2203 * This means that we can't safely call nfsv4 close on a file until 2204 * the inode is cleared. This in turn means that we are not good 2205 * NFSv4 citizens - we do not indicate to the server to update the file's 2206 * share state even when we are done with one of the three share 2207 * stateid's in the inode. 2208 * 2209 * NOTE: Caller must be holding the sp->so_owner semaphore! 2210 */ 2211 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 2212 { 2213 struct nfs_server *server = NFS_SERVER(state->inode); 2214 struct nfs4_closedata *calldata; 2215 struct nfs4_state_owner *sp = state->owner; 2216 struct rpc_task *task; 2217 struct rpc_message msg = { 2218 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 2219 .rpc_cred = state->owner->so_cred, 2220 }; 2221 struct rpc_task_setup task_setup_data = { 2222 .rpc_client = server->client, 2223 .rpc_message = &msg, 2224 .callback_ops = &nfs4_close_ops, 2225 .workqueue = nfsiod_workqueue, 2226 .flags = RPC_TASK_ASYNC, 2227 }; 2228 int status = -ENOMEM; 2229 2230 calldata = kzalloc(sizeof(*calldata), gfp_mask); 2231 if (calldata == NULL) 2232 goto out; 2233 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1); 2234 calldata->inode = state->inode; 2235 calldata->state = state; 2236 calldata->arg.fh = NFS_FH(state->inode); 2237 calldata->arg.stateid = &state->open_stateid; 2238 /* Serialization for the sequence id */ 2239 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask); 2240 if (calldata->arg.seqid == NULL) 2241 goto out_free_calldata; 2242 calldata->arg.fmode = 0; 2243 calldata->arg.bitmask = server->cache_consistency_bitmask; 2244 calldata->res.fattr = &calldata->fattr; 2245 calldata->res.seqid = calldata->arg.seqid; 2246 calldata->res.server = server; 2247 calldata->roc = pnfs_roc(state->inode); 2248 nfs_sb_active(calldata->inode->i_sb); 2249 2250 msg.rpc_argp = &calldata->arg; 2251 msg.rpc_resp = &calldata->res; 2252 task_setup_data.callback_data = calldata; 2253 task = rpc_run_task(&task_setup_data); 2254 if (IS_ERR(task)) 2255 return PTR_ERR(task); 2256 status = 0; 2257 if (wait) 2258 status = rpc_wait_for_completion_task(task); 2259 rpc_put_task(task); 2260 return status; 2261 out_free_calldata: 2262 kfree(calldata); 2263 out: 2264 nfs4_put_open_state(state); 2265 nfs4_put_state_owner(sp); 2266 return status; 2267 } 2268 2269 static struct inode * 2270 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr) 2271 { 2272 struct nfs4_state *state; 2273 2274 /* Protect against concurrent sillydeletes */ 2275 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, 2276 ctx->cred, &ctx->mdsthreshold); 2277 if (IS_ERR(state)) 2278 return ERR_CAST(state); 2279 ctx->state = state; 2280 return igrab(state->inode); 2281 } 2282 2283 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 2284 { 2285 if (ctx->state == NULL) 2286 return; 2287 if (is_sync) 2288 nfs4_close_sync(ctx->state, ctx->mode); 2289 else 2290 nfs4_close_state(ctx->state, ctx->mode); 2291 } 2292 2293 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2294 { 2295 struct nfs4_server_caps_arg args = { 2296 .fhandle = fhandle, 2297 }; 2298 struct nfs4_server_caps_res res = {}; 2299 struct rpc_message msg = { 2300 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 2301 .rpc_argp = &args, 2302 .rpc_resp = &res, 2303 }; 2304 int status; 2305 2306 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2307 if (status == 0) { 2308 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 2309 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS| 2310 NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 2311 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER| 2312 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME| 2313 NFS_CAP_CTIME|NFS_CAP_MTIME); 2314 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) 2315 server->caps |= NFS_CAP_ACLS; 2316 if (res.has_links != 0) 2317 server->caps |= NFS_CAP_HARDLINKS; 2318 if (res.has_symlinks != 0) 2319 server->caps |= NFS_CAP_SYMLINKS; 2320 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID) 2321 server->caps |= NFS_CAP_FILEID; 2322 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE) 2323 server->caps |= NFS_CAP_MODE; 2324 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) 2325 server->caps |= NFS_CAP_NLINK; 2326 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER) 2327 server->caps |= NFS_CAP_OWNER; 2328 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP) 2329 server->caps |= NFS_CAP_OWNER_GROUP; 2330 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS) 2331 server->caps |= NFS_CAP_ATIME; 2332 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA) 2333 server->caps |= NFS_CAP_CTIME; 2334 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY) 2335 server->caps |= NFS_CAP_MTIME; 2336 2337 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 2338 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 2339 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 2340 server->acl_bitmask = res.acl_bitmask; 2341 server->fh_expire_type = res.fh_expire_type; 2342 } 2343 2344 return status; 2345 } 2346 2347 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 2348 { 2349 struct nfs4_exception exception = { }; 2350 int err; 2351 do { 2352 err = nfs4_handle_exception(server, 2353 _nfs4_server_capabilities(server, fhandle), 2354 &exception); 2355 } while (exception.retry); 2356 return err; 2357 } 2358 2359 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2360 struct nfs_fsinfo *info) 2361 { 2362 struct nfs4_lookup_root_arg args = { 2363 .bitmask = nfs4_fattr_bitmap, 2364 }; 2365 struct nfs4_lookup_res res = { 2366 .server = server, 2367 .fattr = info->fattr, 2368 .fh = fhandle, 2369 }; 2370 struct rpc_message msg = { 2371 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 2372 .rpc_argp = &args, 2373 .rpc_resp = &res, 2374 }; 2375 2376 nfs_fattr_init(info->fattr); 2377 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2378 } 2379 2380 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 2381 struct nfs_fsinfo *info) 2382 { 2383 struct nfs4_exception exception = { }; 2384 int err; 2385 do { 2386 err = _nfs4_lookup_root(server, fhandle, info); 2387 switch (err) { 2388 case 0: 2389 case -NFS4ERR_WRONGSEC: 2390 goto out; 2391 default: 2392 err = nfs4_handle_exception(server, err, &exception); 2393 } 2394 } while (exception.retry); 2395 out: 2396 return err; 2397 } 2398 2399 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2400 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 2401 { 2402 struct rpc_auth *auth; 2403 int ret; 2404 2405 auth = rpcauth_create(flavor, server->client); 2406 if (IS_ERR(auth)) { 2407 ret = -EIO; 2408 goto out; 2409 } 2410 ret = nfs4_lookup_root(server, fhandle, info); 2411 out: 2412 return ret; 2413 } 2414 2415 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 2416 struct nfs_fsinfo *info) 2417 { 2418 int i, len, status = 0; 2419 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS]; 2420 2421 len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array)); 2422 if (len < 0) 2423 return len; 2424 2425 for (i = 0; i < len; i++) { 2426 /* AUTH_UNIX is the default flavor if none was specified, 2427 * thus has already been tried. */ 2428 if (flav_array[i] == RPC_AUTH_UNIX) 2429 continue; 2430 2431 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]); 2432 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 2433 continue; 2434 break; 2435 } 2436 /* 2437 * -EACCESS could mean that the user doesn't have correct permissions 2438 * to access the mount. It could also mean that we tried to mount 2439 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 2440 * existing mount programs don't handle -EACCES very well so it should 2441 * be mapped to -EPERM instead. 2442 */ 2443 if (status == -EACCES) 2444 status = -EPERM; 2445 return status; 2446 } 2447 2448 /* 2449 * get the file handle for the "/" directory on the server 2450 */ 2451 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 2452 struct nfs_fsinfo *info) 2453 { 2454 int minor_version = server->nfs_client->cl_minorversion; 2455 int status = nfs4_lookup_root(server, fhandle, info); 2456 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR)) 2457 /* 2458 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM 2459 * by nfs4_map_errors() as this function exits. 2460 */ 2461 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info); 2462 if (status == 0) 2463 status = nfs4_server_capabilities(server, fhandle); 2464 if (status == 0) 2465 status = nfs4_do_fsinfo(server, fhandle, info); 2466 return nfs4_map_errors(status); 2467 } 2468 2469 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 2470 struct nfs_fsinfo *info) 2471 { 2472 int error; 2473 struct nfs_fattr *fattr = info->fattr; 2474 2475 error = nfs4_server_capabilities(server, mntfh); 2476 if (error < 0) { 2477 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 2478 return error; 2479 } 2480 2481 error = nfs4_proc_getattr(server, mntfh, fattr); 2482 if (error < 0) { 2483 dprintk("nfs4_get_root: getattr error = %d\n", -error); 2484 return error; 2485 } 2486 2487 if (fattr->valid & NFS_ATTR_FATTR_FSID && 2488 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 2489 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 2490 2491 return error; 2492 } 2493 2494 /* 2495 * Get locations and (maybe) other attributes of a referral. 2496 * Note that we'll actually follow the referral later when 2497 * we detect fsid mismatch in inode revalidation 2498 */ 2499 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 2500 const struct qstr *name, struct nfs_fattr *fattr, 2501 struct nfs_fh *fhandle) 2502 { 2503 int status = -ENOMEM; 2504 struct page *page = NULL; 2505 struct nfs4_fs_locations *locations = NULL; 2506 2507 page = alloc_page(GFP_KERNEL); 2508 if (page == NULL) 2509 goto out; 2510 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 2511 if (locations == NULL) 2512 goto out; 2513 2514 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 2515 if (status != 0) 2516 goto out; 2517 /* Make sure server returned a different fsid for the referral */ 2518 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 2519 dprintk("%s: server did not return a different fsid for" 2520 " a referral at %s\n", __func__, name->name); 2521 status = -EIO; 2522 goto out; 2523 } 2524 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 2525 nfs_fixup_referral_attributes(&locations->fattr); 2526 2527 /* replace the lookup nfs_fattr with the locations nfs_fattr */ 2528 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 2529 memset(fhandle, 0, sizeof(struct nfs_fh)); 2530 out: 2531 if (page) 2532 __free_page(page); 2533 kfree(locations); 2534 return status; 2535 } 2536 2537 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2538 { 2539 struct nfs4_getattr_arg args = { 2540 .fh = fhandle, 2541 .bitmask = server->attr_bitmask, 2542 }; 2543 struct nfs4_getattr_res res = { 2544 .fattr = fattr, 2545 .server = server, 2546 }; 2547 struct rpc_message msg = { 2548 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 2549 .rpc_argp = &args, 2550 .rpc_resp = &res, 2551 }; 2552 2553 nfs_fattr_init(fattr); 2554 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2555 } 2556 2557 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2558 { 2559 struct nfs4_exception exception = { }; 2560 int err; 2561 do { 2562 err = nfs4_handle_exception(server, 2563 _nfs4_proc_getattr(server, fhandle, fattr), 2564 &exception); 2565 } while (exception.retry); 2566 return err; 2567 } 2568 2569 /* 2570 * The file is not closed if it is opened due to the a request to change 2571 * the size of the file. The open call will not be needed once the 2572 * VFS layer lookup-intents are implemented. 2573 * 2574 * Close is called when the inode is destroyed. 2575 * If we haven't opened the file for O_WRONLY, we 2576 * need to in the size_change case to obtain a stateid. 2577 * 2578 * Got race? 2579 * Because OPEN is always done by name in nfsv4, it is 2580 * possible that we opened a different file by the same 2581 * name. We can recognize this race condition, but we 2582 * can't do anything about it besides returning an error. 2583 * 2584 * This will be fixed with VFS changes (lookup-intent). 2585 */ 2586 static int 2587 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 2588 struct iattr *sattr) 2589 { 2590 struct inode *inode = dentry->d_inode; 2591 struct rpc_cred *cred = NULL; 2592 struct nfs4_state *state = NULL; 2593 int status; 2594 2595 if (pnfs_ld_layoutret_on_setattr(inode)) 2596 pnfs_return_layout(inode); 2597 2598 nfs_fattr_init(fattr); 2599 2600 /* Deal with open(O_TRUNC) */ 2601 if (sattr->ia_valid & ATTR_OPEN) 2602 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN); 2603 2604 /* Optimization: if the end result is no change, don't RPC */ 2605 if ((sattr->ia_valid & ~(ATTR_FILE)) == 0) 2606 return 0; 2607 2608 /* Search for an existing open(O_WRITE) file */ 2609 if (sattr->ia_valid & ATTR_FILE) { 2610 struct nfs_open_context *ctx; 2611 2612 ctx = nfs_file_open_context(sattr->ia_file); 2613 if (ctx) { 2614 cred = ctx->cred; 2615 state = ctx->state; 2616 } 2617 } 2618 2619 status = nfs4_do_setattr(inode, cred, fattr, sattr, state); 2620 if (status == 0) 2621 nfs_setattr_update_inode(inode, sattr); 2622 return status; 2623 } 2624 2625 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 2626 const struct qstr *name, struct nfs_fh *fhandle, 2627 struct nfs_fattr *fattr) 2628 { 2629 struct nfs_server *server = NFS_SERVER(dir); 2630 int status; 2631 struct nfs4_lookup_arg args = { 2632 .bitmask = server->attr_bitmask, 2633 .dir_fh = NFS_FH(dir), 2634 .name = name, 2635 }; 2636 struct nfs4_lookup_res res = { 2637 .server = server, 2638 .fattr = fattr, 2639 .fh = fhandle, 2640 }; 2641 struct rpc_message msg = { 2642 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 2643 .rpc_argp = &args, 2644 .rpc_resp = &res, 2645 }; 2646 2647 nfs_fattr_init(fattr); 2648 2649 dprintk("NFS call lookup %s\n", name->name); 2650 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0); 2651 dprintk("NFS reply lookup: %d\n", status); 2652 return status; 2653 } 2654 2655 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 2656 { 2657 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 2658 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 2659 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 2660 fattr->nlink = 2; 2661 } 2662 2663 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 2664 struct qstr *name, struct nfs_fh *fhandle, 2665 struct nfs_fattr *fattr) 2666 { 2667 struct nfs4_exception exception = { }; 2668 struct rpc_clnt *client = *clnt; 2669 int err; 2670 do { 2671 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr); 2672 switch (err) { 2673 case -NFS4ERR_BADNAME: 2674 err = -ENOENT; 2675 goto out; 2676 case -NFS4ERR_MOVED: 2677 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 2678 goto out; 2679 case -NFS4ERR_WRONGSEC: 2680 err = -EPERM; 2681 if (client != *clnt) 2682 goto out; 2683 2684 client = nfs4_create_sec_client(client, dir, name); 2685 if (IS_ERR(client)) 2686 return PTR_ERR(client); 2687 2688 exception.retry = 1; 2689 break; 2690 default: 2691 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 2692 } 2693 } while (exception.retry); 2694 2695 out: 2696 if (err == 0) 2697 *clnt = client; 2698 else if (client != *clnt) 2699 rpc_shutdown_client(client); 2700 2701 return err; 2702 } 2703 2704 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, 2705 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2706 { 2707 int status; 2708 struct rpc_clnt *client = NFS_CLIENT(dir); 2709 2710 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr); 2711 if (client != NFS_CLIENT(dir)) { 2712 rpc_shutdown_client(client); 2713 nfs_fixup_secinfo_attributes(fattr); 2714 } 2715 return status; 2716 } 2717 2718 struct rpc_clnt * 2719 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name, 2720 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 2721 { 2722 int status; 2723 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir)); 2724 2725 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr); 2726 if (status < 0) { 2727 rpc_shutdown_client(client); 2728 return ERR_PTR(status); 2729 } 2730 return client; 2731 } 2732 2733 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 2734 { 2735 struct nfs_server *server = NFS_SERVER(inode); 2736 struct nfs4_accessargs args = { 2737 .fh = NFS_FH(inode), 2738 .bitmask = server->cache_consistency_bitmask, 2739 }; 2740 struct nfs4_accessres res = { 2741 .server = server, 2742 }; 2743 struct rpc_message msg = { 2744 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 2745 .rpc_argp = &args, 2746 .rpc_resp = &res, 2747 .rpc_cred = entry->cred, 2748 }; 2749 int mode = entry->mask; 2750 int status; 2751 2752 /* 2753 * Determine which access bits we want to ask for... 2754 */ 2755 if (mode & MAY_READ) 2756 args.access |= NFS4_ACCESS_READ; 2757 if (S_ISDIR(inode->i_mode)) { 2758 if (mode & MAY_WRITE) 2759 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 2760 if (mode & MAY_EXEC) 2761 args.access |= NFS4_ACCESS_LOOKUP; 2762 } else { 2763 if (mode & MAY_WRITE) 2764 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 2765 if (mode & MAY_EXEC) 2766 args.access |= NFS4_ACCESS_EXECUTE; 2767 } 2768 2769 res.fattr = nfs_alloc_fattr(); 2770 if (res.fattr == NULL) 2771 return -ENOMEM; 2772 2773 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 2774 if (!status) { 2775 nfs_access_set_mask(entry, res.access); 2776 nfs_refresh_inode(inode, res.fattr); 2777 } 2778 nfs_free_fattr(res.fattr); 2779 return status; 2780 } 2781 2782 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 2783 { 2784 struct nfs4_exception exception = { }; 2785 int err; 2786 do { 2787 err = nfs4_handle_exception(NFS_SERVER(inode), 2788 _nfs4_proc_access(inode, entry), 2789 &exception); 2790 } while (exception.retry); 2791 return err; 2792 } 2793 2794 /* 2795 * TODO: For the time being, we don't try to get any attributes 2796 * along with any of the zero-copy operations READ, READDIR, 2797 * READLINK, WRITE. 2798 * 2799 * In the case of the first three, we want to put the GETATTR 2800 * after the read-type operation -- this is because it is hard 2801 * to predict the length of a GETATTR response in v4, and thus 2802 * align the READ data correctly. This means that the GETATTR 2803 * may end up partially falling into the page cache, and we should 2804 * shift it into the 'tail' of the xdr_buf before processing. 2805 * To do this efficiently, we need to know the total length 2806 * of data received, which doesn't seem to be available outside 2807 * of the RPC layer. 2808 * 2809 * In the case of WRITE, we also want to put the GETATTR after 2810 * the operation -- in this case because we want to make sure 2811 * we get the post-operation mtime and size. 2812 * 2813 * Both of these changes to the XDR layer would in fact be quite 2814 * minor, but I decided to leave them for a subsequent patch. 2815 */ 2816 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 2817 unsigned int pgbase, unsigned int pglen) 2818 { 2819 struct nfs4_readlink args = { 2820 .fh = NFS_FH(inode), 2821 .pgbase = pgbase, 2822 .pglen = pglen, 2823 .pages = &page, 2824 }; 2825 struct nfs4_readlink_res res; 2826 struct rpc_message msg = { 2827 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 2828 .rpc_argp = &args, 2829 .rpc_resp = &res, 2830 }; 2831 2832 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 2833 } 2834 2835 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 2836 unsigned int pgbase, unsigned int pglen) 2837 { 2838 struct nfs4_exception exception = { }; 2839 int err; 2840 do { 2841 err = nfs4_handle_exception(NFS_SERVER(inode), 2842 _nfs4_proc_readlink(inode, page, pgbase, pglen), 2843 &exception); 2844 } while (exception.retry); 2845 return err; 2846 } 2847 2848 /* 2849 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 2850 */ 2851 static int 2852 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 2853 int flags) 2854 { 2855 struct nfs_open_context *ctx; 2856 struct nfs4_state *state; 2857 int status = 0; 2858 2859 ctx = alloc_nfs_open_context(dentry, FMODE_READ); 2860 if (IS_ERR(ctx)) 2861 return PTR_ERR(ctx); 2862 2863 sattr->ia_mode &= ~current_umask(); 2864 state = nfs4_do_open(dir, dentry, ctx->mode, 2865 flags, sattr, ctx->cred, 2866 &ctx->mdsthreshold); 2867 d_drop(dentry); 2868 if (IS_ERR(state)) { 2869 status = PTR_ERR(state); 2870 goto out; 2871 } 2872 d_add(dentry, igrab(state->inode)); 2873 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 2874 ctx->state = state; 2875 out: 2876 put_nfs_open_context(ctx); 2877 return status; 2878 } 2879 2880 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 2881 { 2882 struct nfs_server *server = NFS_SERVER(dir); 2883 struct nfs_removeargs args = { 2884 .fh = NFS_FH(dir), 2885 .name = *name, 2886 }; 2887 struct nfs_removeres res = { 2888 .server = server, 2889 }; 2890 struct rpc_message msg = { 2891 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 2892 .rpc_argp = &args, 2893 .rpc_resp = &res, 2894 }; 2895 int status; 2896 2897 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 2898 if (status == 0) 2899 update_changeattr(dir, &res.cinfo); 2900 return status; 2901 } 2902 2903 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 2904 { 2905 struct nfs4_exception exception = { }; 2906 int err; 2907 do { 2908 err = nfs4_handle_exception(NFS_SERVER(dir), 2909 _nfs4_proc_remove(dir, name), 2910 &exception); 2911 } while (exception.retry); 2912 return err; 2913 } 2914 2915 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 2916 { 2917 struct nfs_server *server = NFS_SERVER(dir); 2918 struct nfs_removeargs *args = msg->rpc_argp; 2919 struct nfs_removeres *res = msg->rpc_resp; 2920 2921 res->server = server; 2922 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 2923 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1); 2924 } 2925 2926 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 2927 { 2928 nfs4_setup_sequence(NFS_SERVER(data->dir), 2929 &data->args.seq_args, 2930 &data->res.seq_res, 2931 task); 2932 } 2933 2934 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 2935 { 2936 struct nfs_removeres *res = task->tk_msg.rpc_resp; 2937 2938 if (!nfs4_sequence_done(task, &res->seq_res)) 2939 return 0; 2940 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 2941 return 0; 2942 update_changeattr(dir, &res->cinfo); 2943 return 1; 2944 } 2945 2946 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir) 2947 { 2948 struct nfs_server *server = NFS_SERVER(dir); 2949 struct nfs_renameargs *arg = msg->rpc_argp; 2950 struct nfs_renameres *res = msg->rpc_resp; 2951 2952 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 2953 res->server = server; 2954 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1); 2955 } 2956 2957 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 2958 { 2959 nfs4_setup_sequence(NFS_SERVER(data->old_dir), 2960 &data->args.seq_args, 2961 &data->res.seq_res, 2962 task); 2963 } 2964 2965 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 2966 struct inode *new_dir) 2967 { 2968 struct nfs_renameres *res = task->tk_msg.rpc_resp; 2969 2970 if (!nfs4_sequence_done(task, &res->seq_res)) 2971 return 0; 2972 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN) 2973 return 0; 2974 2975 update_changeattr(old_dir, &res->old_cinfo); 2976 update_changeattr(new_dir, &res->new_cinfo); 2977 return 1; 2978 } 2979 2980 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 2981 struct inode *new_dir, struct qstr *new_name) 2982 { 2983 struct nfs_server *server = NFS_SERVER(old_dir); 2984 struct nfs_renameargs arg = { 2985 .old_dir = NFS_FH(old_dir), 2986 .new_dir = NFS_FH(new_dir), 2987 .old_name = old_name, 2988 .new_name = new_name, 2989 }; 2990 struct nfs_renameres res = { 2991 .server = server, 2992 }; 2993 struct rpc_message msg = { 2994 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], 2995 .rpc_argp = &arg, 2996 .rpc_resp = &res, 2997 }; 2998 int status = -ENOMEM; 2999 3000 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3001 if (!status) { 3002 update_changeattr(old_dir, &res.old_cinfo); 3003 update_changeattr(new_dir, &res.new_cinfo); 3004 } 3005 return status; 3006 } 3007 3008 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 3009 struct inode *new_dir, struct qstr *new_name) 3010 { 3011 struct nfs4_exception exception = { }; 3012 int err; 3013 do { 3014 err = nfs4_handle_exception(NFS_SERVER(old_dir), 3015 _nfs4_proc_rename(old_dir, old_name, 3016 new_dir, new_name), 3017 &exception); 3018 } while (exception.retry); 3019 return err; 3020 } 3021 3022 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3023 { 3024 struct nfs_server *server = NFS_SERVER(inode); 3025 struct nfs4_link_arg arg = { 3026 .fh = NFS_FH(inode), 3027 .dir_fh = NFS_FH(dir), 3028 .name = name, 3029 .bitmask = server->attr_bitmask, 3030 }; 3031 struct nfs4_link_res res = { 3032 .server = server, 3033 }; 3034 struct rpc_message msg = { 3035 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 3036 .rpc_argp = &arg, 3037 .rpc_resp = &res, 3038 }; 3039 int status = -ENOMEM; 3040 3041 res.fattr = nfs_alloc_fattr(); 3042 if (res.fattr == NULL) 3043 goto out; 3044 3045 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3046 if (!status) { 3047 update_changeattr(dir, &res.cinfo); 3048 nfs_post_op_update_inode(inode, res.fattr); 3049 } 3050 out: 3051 nfs_free_fattr(res.fattr); 3052 return status; 3053 } 3054 3055 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 3056 { 3057 struct nfs4_exception exception = { }; 3058 int err; 3059 do { 3060 err = nfs4_handle_exception(NFS_SERVER(inode), 3061 _nfs4_proc_link(inode, dir, name), 3062 &exception); 3063 } while (exception.retry); 3064 return err; 3065 } 3066 3067 struct nfs4_createdata { 3068 struct rpc_message msg; 3069 struct nfs4_create_arg arg; 3070 struct nfs4_create_res res; 3071 struct nfs_fh fh; 3072 struct nfs_fattr fattr; 3073 }; 3074 3075 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 3076 struct qstr *name, struct iattr *sattr, u32 ftype) 3077 { 3078 struct nfs4_createdata *data; 3079 3080 data = kzalloc(sizeof(*data), GFP_KERNEL); 3081 if (data != NULL) { 3082 struct nfs_server *server = NFS_SERVER(dir); 3083 3084 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 3085 data->msg.rpc_argp = &data->arg; 3086 data->msg.rpc_resp = &data->res; 3087 data->arg.dir_fh = NFS_FH(dir); 3088 data->arg.server = server; 3089 data->arg.name = name; 3090 data->arg.attrs = sattr; 3091 data->arg.ftype = ftype; 3092 data->arg.bitmask = server->attr_bitmask; 3093 data->res.server = server; 3094 data->res.fh = &data->fh; 3095 data->res.fattr = &data->fattr; 3096 nfs_fattr_init(data->res.fattr); 3097 } 3098 return data; 3099 } 3100 3101 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 3102 { 3103 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 3104 &data->arg.seq_args, &data->res.seq_res, 1); 3105 if (status == 0) { 3106 update_changeattr(dir, &data->res.dir_cinfo); 3107 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 3108 } 3109 return status; 3110 } 3111 3112 static void nfs4_free_createdata(struct nfs4_createdata *data) 3113 { 3114 kfree(data); 3115 } 3116 3117 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3118 struct page *page, unsigned int len, struct iattr *sattr) 3119 { 3120 struct nfs4_createdata *data; 3121 int status = -ENAMETOOLONG; 3122 3123 if (len > NFS4_MAXPATHLEN) 3124 goto out; 3125 3126 status = -ENOMEM; 3127 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 3128 if (data == NULL) 3129 goto out; 3130 3131 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 3132 data->arg.u.symlink.pages = &page; 3133 data->arg.u.symlink.len = len; 3134 3135 status = nfs4_do_create(dir, dentry, data); 3136 3137 nfs4_free_createdata(data); 3138 out: 3139 return status; 3140 } 3141 3142 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 3143 struct page *page, unsigned int len, struct iattr *sattr) 3144 { 3145 struct nfs4_exception exception = { }; 3146 int err; 3147 do { 3148 err = nfs4_handle_exception(NFS_SERVER(dir), 3149 _nfs4_proc_symlink(dir, dentry, page, 3150 len, sattr), 3151 &exception); 3152 } while (exception.retry); 3153 return err; 3154 } 3155 3156 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3157 struct iattr *sattr) 3158 { 3159 struct nfs4_createdata *data; 3160 int status = -ENOMEM; 3161 3162 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 3163 if (data == NULL) 3164 goto out; 3165 3166 status = nfs4_do_create(dir, dentry, data); 3167 3168 nfs4_free_createdata(data); 3169 out: 3170 return status; 3171 } 3172 3173 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 3174 struct iattr *sattr) 3175 { 3176 struct nfs4_exception exception = { }; 3177 int err; 3178 3179 sattr->ia_mode &= ~current_umask(); 3180 do { 3181 err = nfs4_handle_exception(NFS_SERVER(dir), 3182 _nfs4_proc_mkdir(dir, dentry, sattr), 3183 &exception); 3184 } while (exception.retry); 3185 return err; 3186 } 3187 3188 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3189 u64 cookie, struct page **pages, unsigned int count, int plus) 3190 { 3191 struct inode *dir = dentry->d_inode; 3192 struct nfs4_readdir_arg args = { 3193 .fh = NFS_FH(dir), 3194 .pages = pages, 3195 .pgbase = 0, 3196 .count = count, 3197 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 3198 .plus = plus, 3199 }; 3200 struct nfs4_readdir_res res; 3201 struct rpc_message msg = { 3202 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 3203 .rpc_argp = &args, 3204 .rpc_resp = &res, 3205 .rpc_cred = cred, 3206 }; 3207 int status; 3208 3209 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__, 3210 dentry->d_parent->d_name.name, 3211 dentry->d_name.name, 3212 (unsigned long long)cookie); 3213 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args); 3214 res.pgbase = args.pgbase; 3215 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 3216 if (status >= 0) { 3217 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE); 3218 status += args.pgbase; 3219 } 3220 3221 nfs_invalidate_atime(dir); 3222 3223 dprintk("%s: returns %d\n", __func__, status); 3224 return status; 3225 } 3226 3227 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 3228 u64 cookie, struct page **pages, unsigned int count, int plus) 3229 { 3230 struct nfs4_exception exception = { }; 3231 int err; 3232 do { 3233 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), 3234 _nfs4_proc_readdir(dentry, cred, cookie, 3235 pages, count, plus), 3236 &exception); 3237 } while (exception.retry); 3238 return err; 3239 } 3240 3241 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3242 struct iattr *sattr, dev_t rdev) 3243 { 3244 struct nfs4_createdata *data; 3245 int mode = sattr->ia_mode; 3246 int status = -ENOMEM; 3247 3248 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 3249 if (data == NULL) 3250 goto out; 3251 3252 if (S_ISFIFO(mode)) 3253 data->arg.ftype = NF4FIFO; 3254 else if (S_ISBLK(mode)) { 3255 data->arg.ftype = NF4BLK; 3256 data->arg.u.device.specdata1 = MAJOR(rdev); 3257 data->arg.u.device.specdata2 = MINOR(rdev); 3258 } 3259 else if (S_ISCHR(mode)) { 3260 data->arg.ftype = NF4CHR; 3261 data->arg.u.device.specdata1 = MAJOR(rdev); 3262 data->arg.u.device.specdata2 = MINOR(rdev); 3263 } else if (!S_ISSOCK(mode)) { 3264 status = -EINVAL; 3265 goto out_free; 3266 } 3267 3268 status = nfs4_do_create(dir, dentry, data); 3269 out_free: 3270 nfs4_free_createdata(data); 3271 out: 3272 return status; 3273 } 3274 3275 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 3276 struct iattr *sattr, dev_t rdev) 3277 { 3278 struct nfs4_exception exception = { }; 3279 int err; 3280 3281 sattr->ia_mode &= ~current_umask(); 3282 do { 3283 err = nfs4_handle_exception(NFS_SERVER(dir), 3284 _nfs4_proc_mknod(dir, dentry, sattr, rdev), 3285 &exception); 3286 } while (exception.retry); 3287 return err; 3288 } 3289 3290 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 3291 struct nfs_fsstat *fsstat) 3292 { 3293 struct nfs4_statfs_arg args = { 3294 .fh = fhandle, 3295 .bitmask = server->attr_bitmask, 3296 }; 3297 struct nfs4_statfs_res res = { 3298 .fsstat = fsstat, 3299 }; 3300 struct rpc_message msg = { 3301 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 3302 .rpc_argp = &args, 3303 .rpc_resp = &res, 3304 }; 3305 3306 nfs_fattr_init(fsstat->fattr); 3307 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3308 } 3309 3310 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 3311 { 3312 struct nfs4_exception exception = { }; 3313 int err; 3314 do { 3315 err = nfs4_handle_exception(server, 3316 _nfs4_proc_statfs(server, fhandle, fsstat), 3317 &exception); 3318 } while (exception.retry); 3319 return err; 3320 } 3321 3322 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 3323 struct nfs_fsinfo *fsinfo) 3324 { 3325 struct nfs4_fsinfo_arg args = { 3326 .fh = fhandle, 3327 .bitmask = server->attr_bitmask, 3328 }; 3329 struct nfs4_fsinfo_res res = { 3330 .fsinfo = fsinfo, 3331 }; 3332 struct rpc_message msg = { 3333 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 3334 .rpc_argp = &args, 3335 .rpc_resp = &res, 3336 }; 3337 3338 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3339 } 3340 3341 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3342 { 3343 struct nfs4_exception exception = { }; 3344 int err; 3345 3346 do { 3347 err = nfs4_handle_exception(server, 3348 _nfs4_do_fsinfo(server, fhandle, fsinfo), 3349 &exception); 3350 } while (exception.retry); 3351 return err; 3352 } 3353 3354 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 3355 { 3356 int error; 3357 3358 nfs_fattr_init(fsinfo->fattr); 3359 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 3360 if (error == 0) { 3361 /* block layout checks this! */ 3362 server->pnfs_blksize = fsinfo->blksize; 3363 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype); 3364 } 3365 3366 return error; 3367 } 3368 3369 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 3370 struct nfs_pathconf *pathconf) 3371 { 3372 struct nfs4_pathconf_arg args = { 3373 .fh = fhandle, 3374 .bitmask = server->attr_bitmask, 3375 }; 3376 struct nfs4_pathconf_res res = { 3377 .pathconf = pathconf, 3378 }; 3379 struct rpc_message msg = { 3380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 3381 .rpc_argp = &args, 3382 .rpc_resp = &res, 3383 }; 3384 3385 /* None of the pathconf attributes are mandatory to implement */ 3386 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 3387 memset(pathconf, 0, sizeof(*pathconf)); 3388 return 0; 3389 } 3390 3391 nfs_fattr_init(pathconf->fattr); 3392 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3393 } 3394 3395 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 3396 struct nfs_pathconf *pathconf) 3397 { 3398 struct nfs4_exception exception = { }; 3399 int err; 3400 3401 do { 3402 err = nfs4_handle_exception(server, 3403 _nfs4_proc_pathconf(server, fhandle, pathconf), 3404 &exception); 3405 } while (exception.retry); 3406 return err; 3407 } 3408 3409 void __nfs4_read_done_cb(struct nfs_read_data *data) 3410 { 3411 nfs_invalidate_atime(data->header->inode); 3412 } 3413 3414 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data) 3415 { 3416 struct nfs_server *server = NFS_SERVER(data->header->inode); 3417 3418 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) { 3419 rpc_restart_call_prepare(task); 3420 return -EAGAIN; 3421 } 3422 3423 __nfs4_read_done_cb(data); 3424 if (task->tk_status > 0) 3425 renew_lease(server, data->timestamp); 3426 return 0; 3427 } 3428 3429 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) 3430 { 3431 3432 dprintk("--> %s\n", __func__); 3433 3434 if (!nfs4_sequence_done(task, &data->res.seq_res)) 3435 return -EAGAIN; 3436 3437 return data->read_done_cb ? data->read_done_cb(task, data) : 3438 nfs4_read_done_cb(task, data); 3439 } 3440 3441 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) 3442 { 3443 data->timestamp = jiffies; 3444 data->read_done_cb = nfs4_read_done_cb; 3445 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 3446 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0); 3447 } 3448 3449 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data) 3450 { 3451 nfs4_setup_sequence(NFS_SERVER(data->header->inode), 3452 &data->args.seq_args, 3453 &data->res.seq_res, 3454 task); 3455 } 3456 3457 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data) 3458 { 3459 struct inode *inode = data->header->inode; 3460 3461 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) { 3462 rpc_restart_call_prepare(task); 3463 return -EAGAIN; 3464 } 3465 if (task->tk_status >= 0) { 3466 renew_lease(NFS_SERVER(inode), data->timestamp); 3467 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 3468 } 3469 return 0; 3470 } 3471 3472 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) 3473 { 3474 if (!nfs4_sequence_done(task, &data->res.seq_res)) 3475 return -EAGAIN; 3476 return data->write_done_cb ? data->write_done_cb(task, data) : 3477 nfs4_write_done_cb(task, data); 3478 } 3479 3480 static 3481 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data) 3482 { 3483 const struct nfs_pgio_header *hdr = data->header; 3484 3485 /* Don't request attributes for pNFS or O_DIRECT writes */ 3486 if (data->ds_clp != NULL || hdr->dreq != NULL) 3487 return false; 3488 /* Otherwise, request attributes if and only if we don't hold 3489 * a delegation 3490 */ 3491 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 3492 } 3493 3494 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) 3495 { 3496 struct nfs_server *server = NFS_SERVER(data->header->inode); 3497 3498 if (!nfs4_write_need_cache_consistency_data(data)) { 3499 data->args.bitmask = NULL; 3500 data->res.fattr = NULL; 3501 } else 3502 data->args.bitmask = server->cache_consistency_bitmask; 3503 3504 if (!data->write_done_cb) 3505 data->write_done_cb = nfs4_write_done_cb; 3506 data->res.server = server; 3507 data->timestamp = jiffies; 3508 3509 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 3510 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 3511 } 3512 3513 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data) 3514 { 3515 nfs4_setup_sequence(NFS_SERVER(data->header->inode), 3516 &data->args.seq_args, 3517 &data->res.seq_res, 3518 task); 3519 } 3520 3521 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 3522 { 3523 nfs4_setup_sequence(NFS_SERVER(data->inode), 3524 &data->args.seq_args, 3525 &data->res.seq_res, 3526 task); 3527 } 3528 3529 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 3530 { 3531 struct inode *inode = data->inode; 3532 3533 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) { 3534 rpc_restart_call_prepare(task); 3535 return -EAGAIN; 3536 } 3537 return 0; 3538 } 3539 3540 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 3541 { 3542 if (!nfs4_sequence_done(task, &data->res.seq_res)) 3543 return -EAGAIN; 3544 return data->commit_done_cb(task, data); 3545 } 3546 3547 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg) 3548 { 3549 struct nfs_server *server = NFS_SERVER(data->inode); 3550 3551 if (data->commit_done_cb == NULL) 3552 data->commit_done_cb = nfs4_commit_done_cb; 3553 data->res.server = server; 3554 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 3555 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 3556 } 3557 3558 struct nfs4_renewdata { 3559 struct nfs_client *client; 3560 unsigned long timestamp; 3561 }; 3562 3563 /* 3564 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 3565 * standalone procedure for queueing an asynchronous RENEW. 3566 */ 3567 static void nfs4_renew_release(void *calldata) 3568 { 3569 struct nfs4_renewdata *data = calldata; 3570 struct nfs_client *clp = data->client; 3571 3572 if (atomic_read(&clp->cl_count) > 1) 3573 nfs4_schedule_state_renewal(clp); 3574 nfs_put_client(clp); 3575 kfree(data); 3576 } 3577 3578 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 3579 { 3580 struct nfs4_renewdata *data = calldata; 3581 struct nfs_client *clp = data->client; 3582 unsigned long timestamp = data->timestamp; 3583 3584 if (task->tk_status < 0) { 3585 /* Unless we're shutting down, schedule state recovery! */ 3586 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 3587 return; 3588 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 3589 nfs4_schedule_lease_recovery(clp); 3590 return; 3591 } 3592 nfs4_schedule_path_down_recovery(clp); 3593 } 3594 do_renew_lease(clp, timestamp); 3595 } 3596 3597 static const struct rpc_call_ops nfs4_renew_ops = { 3598 .rpc_call_done = nfs4_renew_done, 3599 .rpc_release = nfs4_renew_release, 3600 }; 3601 3602 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 3603 { 3604 struct rpc_message msg = { 3605 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 3606 .rpc_argp = clp, 3607 .rpc_cred = cred, 3608 }; 3609 struct nfs4_renewdata *data; 3610 3611 if (renew_flags == 0) 3612 return 0; 3613 if (!atomic_inc_not_zero(&clp->cl_count)) 3614 return -EIO; 3615 data = kmalloc(sizeof(*data), GFP_NOFS); 3616 if (data == NULL) 3617 return -ENOMEM; 3618 data->client = clp; 3619 data->timestamp = jiffies; 3620 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, 3621 &nfs4_renew_ops, data); 3622 } 3623 3624 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 3625 { 3626 struct rpc_message msg = { 3627 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 3628 .rpc_argp = clp, 3629 .rpc_cred = cred, 3630 }; 3631 unsigned long now = jiffies; 3632 int status; 3633 3634 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 3635 if (status < 0) 3636 return status; 3637 do_renew_lease(clp, now); 3638 return 0; 3639 } 3640 3641 static inline int nfs4_server_supports_acls(struct nfs_server *server) 3642 { 3643 return (server->caps & NFS_CAP_ACLS) 3644 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3645 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); 3646 } 3647 3648 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 3649 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 3650 * the stack. 3651 */ 3652 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 3653 3654 static int buf_to_pages_noslab(const void *buf, size_t buflen, 3655 struct page **pages, unsigned int *pgbase) 3656 { 3657 struct page *newpage, **spages; 3658 int rc = 0; 3659 size_t len; 3660 spages = pages; 3661 3662 do { 3663 len = min_t(size_t, PAGE_SIZE, buflen); 3664 newpage = alloc_page(GFP_KERNEL); 3665 3666 if (newpage == NULL) 3667 goto unwind; 3668 memcpy(page_address(newpage), buf, len); 3669 buf += len; 3670 buflen -= len; 3671 *pages++ = newpage; 3672 rc++; 3673 } while (buflen != 0); 3674 3675 return rc; 3676 3677 unwind: 3678 for(; rc > 0; rc--) 3679 __free_page(spages[rc-1]); 3680 return -ENOMEM; 3681 } 3682 3683 struct nfs4_cached_acl { 3684 int cached; 3685 size_t len; 3686 char data[0]; 3687 }; 3688 3689 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 3690 { 3691 struct nfs_inode *nfsi = NFS_I(inode); 3692 3693 spin_lock(&inode->i_lock); 3694 kfree(nfsi->nfs4_acl); 3695 nfsi->nfs4_acl = acl; 3696 spin_unlock(&inode->i_lock); 3697 } 3698 3699 static void nfs4_zap_acl_attr(struct inode *inode) 3700 { 3701 nfs4_set_cached_acl(inode, NULL); 3702 } 3703 3704 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 3705 { 3706 struct nfs_inode *nfsi = NFS_I(inode); 3707 struct nfs4_cached_acl *acl; 3708 int ret = -ENOENT; 3709 3710 spin_lock(&inode->i_lock); 3711 acl = nfsi->nfs4_acl; 3712 if (acl == NULL) 3713 goto out; 3714 if (buf == NULL) /* user is just asking for length */ 3715 goto out_len; 3716 if (acl->cached == 0) 3717 goto out; 3718 ret = -ERANGE; /* see getxattr(2) man page */ 3719 if (acl->len > buflen) 3720 goto out; 3721 memcpy(buf, acl->data, acl->len); 3722 out_len: 3723 ret = acl->len; 3724 out: 3725 spin_unlock(&inode->i_lock); 3726 return ret; 3727 } 3728 3729 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len) 3730 { 3731 struct nfs4_cached_acl *acl; 3732 size_t buflen = sizeof(*acl) + acl_len; 3733 3734 if (buflen <= PAGE_SIZE) { 3735 acl = kmalloc(buflen, GFP_KERNEL); 3736 if (acl == NULL) 3737 goto out; 3738 acl->cached = 1; 3739 _copy_from_pages(acl->data, pages, pgbase, acl_len); 3740 } else { 3741 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 3742 if (acl == NULL) 3743 goto out; 3744 acl->cached = 0; 3745 } 3746 acl->len = acl_len; 3747 out: 3748 nfs4_set_cached_acl(inode, acl); 3749 } 3750 3751 /* 3752 * The getxattr API returns the required buffer length when called with a 3753 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 3754 * the required buf. On a NULL buf, we send a page of data to the server 3755 * guessing that the ACL request can be serviced by a page. If so, we cache 3756 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 3757 * the cache. If not so, we throw away the page, and cache the required 3758 * length. The next getxattr call will then produce another round trip to 3759 * the server, this time with the input buf of the required size. 3760 */ 3761 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 3762 { 3763 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, }; 3764 struct nfs_getaclargs args = { 3765 .fh = NFS_FH(inode), 3766 .acl_pages = pages, 3767 .acl_len = buflen, 3768 }; 3769 struct nfs_getaclres res = { 3770 .acl_len = buflen, 3771 }; 3772 struct rpc_message msg = { 3773 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 3774 .rpc_argp = &args, 3775 .rpc_resp = &res, 3776 }; 3777 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 3778 int ret = -ENOMEM, i; 3779 3780 /* As long as we're doing a round trip to the server anyway, 3781 * let's be prepared for a page of acl data. */ 3782 if (npages == 0) 3783 npages = 1; 3784 if (npages > ARRAY_SIZE(pages)) 3785 return -ERANGE; 3786 3787 for (i = 0; i < npages; i++) { 3788 pages[i] = alloc_page(GFP_KERNEL); 3789 if (!pages[i]) 3790 goto out_free; 3791 } 3792 3793 /* for decoding across pages */ 3794 res.acl_scratch = alloc_page(GFP_KERNEL); 3795 if (!res.acl_scratch) 3796 goto out_free; 3797 3798 args.acl_len = npages * PAGE_SIZE; 3799 args.acl_pgbase = 0; 3800 3801 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 3802 __func__, buf, buflen, npages, args.acl_len); 3803 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 3804 &msg, &args.seq_args, &res.seq_res, 0); 3805 if (ret) 3806 goto out_free; 3807 3808 /* Handle the case where the passed-in buffer is too short */ 3809 if (res.acl_flags & NFS4_ACL_TRUNC) { 3810 /* Did the user only issue a request for the acl length? */ 3811 if (buf == NULL) 3812 goto out_ok; 3813 ret = -ERANGE; 3814 goto out_free; 3815 } 3816 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len); 3817 if (buf) { 3818 if (res.acl_len > buflen) { 3819 ret = -ERANGE; 3820 goto out_free; 3821 } 3822 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 3823 } 3824 out_ok: 3825 ret = res.acl_len; 3826 out_free: 3827 for (i = 0; i < npages; i++) 3828 if (pages[i]) 3829 __free_page(pages[i]); 3830 if (res.acl_scratch) 3831 __free_page(res.acl_scratch); 3832 return ret; 3833 } 3834 3835 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 3836 { 3837 struct nfs4_exception exception = { }; 3838 ssize_t ret; 3839 do { 3840 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 3841 if (ret >= 0) 3842 break; 3843 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 3844 } while (exception.retry); 3845 return ret; 3846 } 3847 3848 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 3849 { 3850 struct nfs_server *server = NFS_SERVER(inode); 3851 int ret; 3852 3853 if (!nfs4_server_supports_acls(server)) 3854 return -EOPNOTSUPP; 3855 ret = nfs_revalidate_inode(server, inode); 3856 if (ret < 0) 3857 return ret; 3858 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 3859 nfs_zap_acl_cache(inode); 3860 ret = nfs4_read_cached_acl(inode, buf, buflen); 3861 if (ret != -ENOENT) 3862 /* -ENOENT is returned if there is no ACL or if there is an ACL 3863 * but no cached acl data, just the acl length */ 3864 return ret; 3865 return nfs4_get_acl_uncached(inode, buf, buflen); 3866 } 3867 3868 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 3869 { 3870 struct nfs_server *server = NFS_SERVER(inode); 3871 struct page *pages[NFS4ACL_MAXPAGES]; 3872 struct nfs_setaclargs arg = { 3873 .fh = NFS_FH(inode), 3874 .acl_pages = pages, 3875 .acl_len = buflen, 3876 }; 3877 struct nfs_setaclres res; 3878 struct rpc_message msg = { 3879 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 3880 .rpc_argp = &arg, 3881 .rpc_resp = &res, 3882 }; 3883 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 3884 int ret, i; 3885 3886 if (!nfs4_server_supports_acls(server)) 3887 return -EOPNOTSUPP; 3888 if (npages > ARRAY_SIZE(pages)) 3889 return -ERANGE; 3890 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 3891 if (i < 0) 3892 return i; 3893 nfs4_inode_return_delegation(inode); 3894 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 3895 3896 /* 3897 * Free each page after tx, so the only ref left is 3898 * held by the network stack 3899 */ 3900 for (; i > 0; i--) 3901 put_page(pages[i-1]); 3902 3903 /* 3904 * Acl update can result in inode attribute update. 3905 * so mark the attribute cache invalid. 3906 */ 3907 spin_lock(&inode->i_lock); 3908 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 3909 spin_unlock(&inode->i_lock); 3910 nfs_access_zap_cache(inode); 3911 nfs_zap_acl_cache(inode); 3912 return ret; 3913 } 3914 3915 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 3916 { 3917 struct nfs4_exception exception = { }; 3918 int err; 3919 do { 3920 err = nfs4_handle_exception(NFS_SERVER(inode), 3921 __nfs4_proc_set_acl(inode, buf, buflen), 3922 &exception); 3923 } while (exception.retry); 3924 return err; 3925 } 3926 3927 static int 3928 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state) 3929 { 3930 struct nfs_client *clp = server->nfs_client; 3931 3932 if (task->tk_status >= 0) 3933 return 0; 3934 switch(task->tk_status) { 3935 case -NFS4ERR_DELEG_REVOKED: 3936 case -NFS4ERR_ADMIN_REVOKED: 3937 case -NFS4ERR_BAD_STATEID: 3938 if (state == NULL) 3939 break; 3940 nfs_remove_bad_delegation(state->inode); 3941 case -NFS4ERR_OPENMODE: 3942 if (state == NULL) 3943 break; 3944 nfs4_schedule_stateid_recovery(server, state); 3945 goto wait_on_recovery; 3946 case -NFS4ERR_EXPIRED: 3947 if (state != NULL) 3948 nfs4_schedule_stateid_recovery(server, state); 3949 case -NFS4ERR_STALE_STATEID: 3950 case -NFS4ERR_STALE_CLIENTID: 3951 nfs4_schedule_lease_recovery(clp); 3952 goto wait_on_recovery; 3953 #if defined(CONFIG_NFS_V4_1) 3954 case -NFS4ERR_BADSESSION: 3955 case -NFS4ERR_BADSLOT: 3956 case -NFS4ERR_BAD_HIGH_SLOT: 3957 case -NFS4ERR_DEADSESSION: 3958 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 3959 case -NFS4ERR_SEQ_FALSE_RETRY: 3960 case -NFS4ERR_SEQ_MISORDERED: 3961 dprintk("%s ERROR %d, Reset session\n", __func__, 3962 task->tk_status); 3963 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 3964 task->tk_status = 0; 3965 return -EAGAIN; 3966 #endif /* CONFIG_NFS_V4_1 */ 3967 case -NFS4ERR_DELAY: 3968 nfs_inc_server_stats(server, NFSIOS_DELAY); 3969 case -NFS4ERR_GRACE: 3970 rpc_delay(task, NFS4_POLL_RETRY_MAX); 3971 task->tk_status = 0; 3972 return -EAGAIN; 3973 case -NFS4ERR_RETRY_UNCACHED_REP: 3974 case -NFS4ERR_OLD_STATEID: 3975 task->tk_status = 0; 3976 return -EAGAIN; 3977 } 3978 task->tk_status = nfs4_map_errors(task->tk_status); 3979 return 0; 3980 wait_on_recovery: 3981 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 3982 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 3983 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 3984 task->tk_status = 0; 3985 return -EAGAIN; 3986 } 3987 3988 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 3989 nfs4_verifier *bootverf) 3990 { 3991 __be32 verf[2]; 3992 3993 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 3994 /* An impossible timestamp guarantees this value 3995 * will never match a generated boot time. */ 3996 verf[0] = 0; 3997 verf[1] = (__be32)(NSEC_PER_SEC + 1); 3998 } else { 3999 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 4000 verf[0] = (__be32)nn->boot_time.tv_sec; 4001 verf[1] = (__be32)nn->boot_time.tv_nsec; 4002 } 4003 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 4004 } 4005 4006 static unsigned int 4007 nfs4_init_nonuniform_client_string(const struct nfs_client *clp, 4008 char *buf, size_t len) 4009 { 4010 unsigned int result; 4011 4012 rcu_read_lock(); 4013 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s", 4014 clp->cl_ipaddr, 4015 rpc_peeraddr2str(clp->cl_rpcclient, 4016 RPC_DISPLAY_ADDR), 4017 rpc_peeraddr2str(clp->cl_rpcclient, 4018 RPC_DISPLAY_PROTO)); 4019 rcu_read_unlock(); 4020 return result; 4021 } 4022 4023 static unsigned int 4024 nfs4_init_uniform_client_string(const struct nfs_client *clp, 4025 char *buf, size_t len) 4026 { 4027 char *nodename = clp->cl_rpcclient->cl_nodename; 4028 4029 if (nfs4_client_id_uniquifier[0] != '\0') 4030 nodename = nfs4_client_id_uniquifier; 4031 return scnprintf(buf, len, "Linux NFSv%u.%u %s", 4032 clp->rpc_ops->version, clp->cl_minorversion, 4033 nodename); 4034 } 4035 4036 /** 4037 * nfs4_proc_setclientid - Negotiate client ID 4038 * @clp: state data structure 4039 * @program: RPC program for NFSv4 callback service 4040 * @port: IP port number for NFS4 callback service 4041 * @cred: RPC credential to use for this call 4042 * @res: where to place the result 4043 * 4044 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4045 */ 4046 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 4047 unsigned short port, struct rpc_cred *cred, 4048 struct nfs4_setclientid_res *res) 4049 { 4050 nfs4_verifier sc_verifier; 4051 struct nfs4_setclientid setclientid = { 4052 .sc_verifier = &sc_verifier, 4053 .sc_prog = program, 4054 .sc_cb_ident = clp->cl_cb_ident, 4055 }; 4056 struct rpc_message msg = { 4057 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 4058 .rpc_argp = &setclientid, 4059 .rpc_resp = res, 4060 .rpc_cred = cred, 4061 }; 4062 int status; 4063 4064 /* nfs_client_id4 */ 4065 nfs4_init_boot_verifier(clp, &sc_verifier); 4066 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 4067 setclientid.sc_name_len = 4068 nfs4_init_uniform_client_string(clp, 4069 setclientid.sc_name, 4070 sizeof(setclientid.sc_name)); 4071 else 4072 setclientid.sc_name_len = 4073 nfs4_init_nonuniform_client_string(clp, 4074 setclientid.sc_name, 4075 sizeof(setclientid.sc_name)); 4076 /* cb_client4 */ 4077 rcu_read_lock(); 4078 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, 4079 sizeof(setclientid.sc_netid), 4080 rpc_peeraddr2str(clp->cl_rpcclient, 4081 RPC_DISPLAY_NETID)); 4082 rcu_read_unlock(); 4083 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 4084 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 4085 clp->cl_ipaddr, port >> 8, port & 255); 4086 4087 dprintk("NFS call setclientid auth=%s, '%.*s'\n", 4088 clp->cl_rpcclient->cl_auth->au_ops->au_name, 4089 setclientid.sc_name_len, setclientid.sc_name); 4090 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4091 dprintk("NFS reply setclientid: %d\n", status); 4092 return status; 4093 } 4094 4095 /** 4096 * nfs4_proc_setclientid_confirm - Confirm client ID 4097 * @clp: state data structure 4098 * @res: result of a previous SETCLIENTID 4099 * @cred: RPC credential to use for this call 4100 * 4101 * Returns zero, a negative errno, or a negative NFS4ERR status code. 4102 */ 4103 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 4104 struct nfs4_setclientid_res *arg, 4105 struct rpc_cred *cred) 4106 { 4107 struct nfs_fsinfo fsinfo; 4108 struct rpc_message msg = { 4109 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 4110 .rpc_argp = arg, 4111 .rpc_resp = &fsinfo, 4112 .rpc_cred = cred, 4113 }; 4114 unsigned long now; 4115 int status; 4116 4117 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 4118 clp->cl_rpcclient->cl_auth->au_ops->au_name, 4119 clp->cl_clientid); 4120 now = jiffies; 4121 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 4122 if (status == 0) { 4123 spin_lock(&clp->cl_lock); 4124 clp->cl_lease_time = fsinfo.lease_time * HZ; 4125 clp->cl_last_renewal = now; 4126 spin_unlock(&clp->cl_lock); 4127 } 4128 dprintk("NFS reply setclientid_confirm: %d\n", status); 4129 return status; 4130 } 4131 4132 struct nfs4_delegreturndata { 4133 struct nfs4_delegreturnargs args; 4134 struct nfs4_delegreturnres res; 4135 struct nfs_fh fh; 4136 nfs4_stateid stateid; 4137 unsigned long timestamp; 4138 struct nfs_fattr fattr; 4139 int rpc_status; 4140 }; 4141 4142 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 4143 { 4144 struct nfs4_delegreturndata *data = calldata; 4145 4146 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4147 return; 4148 4149 switch (task->tk_status) { 4150 case -NFS4ERR_STALE_STATEID: 4151 case -NFS4ERR_EXPIRED: 4152 case 0: 4153 renew_lease(data->res.server, data->timestamp); 4154 break; 4155 default: 4156 if (nfs4_async_handle_error(task, data->res.server, NULL) == 4157 -EAGAIN) { 4158 rpc_restart_call_prepare(task); 4159 return; 4160 } 4161 } 4162 data->rpc_status = task->tk_status; 4163 } 4164 4165 static void nfs4_delegreturn_release(void *calldata) 4166 { 4167 kfree(calldata); 4168 } 4169 4170 #if defined(CONFIG_NFS_V4_1) 4171 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 4172 { 4173 struct nfs4_delegreturndata *d_data; 4174 4175 d_data = (struct nfs4_delegreturndata *)data; 4176 4177 nfs4_setup_sequence(d_data->res.server, 4178 &d_data->args.seq_args, 4179 &d_data->res.seq_res, 4180 task); 4181 } 4182 #endif /* CONFIG_NFS_V4_1 */ 4183 4184 static const struct rpc_call_ops nfs4_delegreturn_ops = { 4185 #if defined(CONFIG_NFS_V4_1) 4186 .rpc_call_prepare = nfs4_delegreturn_prepare, 4187 #endif /* CONFIG_NFS_V4_1 */ 4188 .rpc_call_done = nfs4_delegreturn_done, 4189 .rpc_release = nfs4_delegreturn_release, 4190 }; 4191 4192 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 4193 { 4194 struct nfs4_delegreturndata *data; 4195 struct nfs_server *server = NFS_SERVER(inode); 4196 struct rpc_task *task; 4197 struct rpc_message msg = { 4198 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 4199 .rpc_cred = cred, 4200 }; 4201 struct rpc_task_setup task_setup_data = { 4202 .rpc_client = server->client, 4203 .rpc_message = &msg, 4204 .callback_ops = &nfs4_delegreturn_ops, 4205 .flags = RPC_TASK_ASYNC, 4206 }; 4207 int status = 0; 4208 4209 data = kzalloc(sizeof(*data), GFP_NOFS); 4210 if (data == NULL) 4211 return -ENOMEM; 4212 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 4213 data->args.fhandle = &data->fh; 4214 data->args.stateid = &data->stateid; 4215 data->args.bitmask = server->cache_consistency_bitmask; 4216 nfs_copy_fh(&data->fh, NFS_FH(inode)); 4217 nfs4_stateid_copy(&data->stateid, stateid); 4218 data->res.fattr = &data->fattr; 4219 data->res.server = server; 4220 nfs_fattr_init(data->res.fattr); 4221 data->timestamp = jiffies; 4222 data->rpc_status = 0; 4223 4224 task_setup_data.callback_data = data; 4225 msg.rpc_argp = &data->args; 4226 msg.rpc_resp = &data->res; 4227 task = rpc_run_task(&task_setup_data); 4228 if (IS_ERR(task)) 4229 return PTR_ERR(task); 4230 if (!issync) 4231 goto out; 4232 status = nfs4_wait_for_completion_rpc_task(task); 4233 if (status != 0) 4234 goto out; 4235 status = data->rpc_status; 4236 if (status == 0) 4237 nfs_post_op_update_inode_force_wcc(inode, &data->fattr); 4238 else 4239 nfs_refresh_inode(inode, &data->fattr); 4240 out: 4241 rpc_put_task(task); 4242 return status; 4243 } 4244 4245 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 4246 { 4247 struct nfs_server *server = NFS_SERVER(inode); 4248 struct nfs4_exception exception = { }; 4249 int err; 4250 do { 4251 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 4252 switch (err) { 4253 case -NFS4ERR_STALE_STATEID: 4254 case -NFS4ERR_EXPIRED: 4255 case 0: 4256 return 0; 4257 } 4258 err = nfs4_handle_exception(server, err, &exception); 4259 } while (exception.retry); 4260 return err; 4261 } 4262 4263 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 4264 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 4265 4266 /* 4267 * sleep, with exponential backoff, and retry the LOCK operation. 4268 */ 4269 static unsigned long 4270 nfs4_set_lock_task_retry(unsigned long timeout) 4271 { 4272 freezable_schedule_timeout_killable(timeout); 4273 timeout <<= 1; 4274 if (timeout > NFS4_LOCK_MAXTIMEOUT) 4275 return NFS4_LOCK_MAXTIMEOUT; 4276 return timeout; 4277 } 4278 4279 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4280 { 4281 struct inode *inode = state->inode; 4282 struct nfs_server *server = NFS_SERVER(inode); 4283 struct nfs_client *clp = server->nfs_client; 4284 struct nfs_lockt_args arg = { 4285 .fh = NFS_FH(inode), 4286 .fl = request, 4287 }; 4288 struct nfs_lockt_res res = { 4289 .denied = request, 4290 }; 4291 struct rpc_message msg = { 4292 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 4293 .rpc_argp = &arg, 4294 .rpc_resp = &res, 4295 .rpc_cred = state->owner->so_cred, 4296 }; 4297 struct nfs4_lock_state *lsp; 4298 int status; 4299 4300 arg.lock_owner.clientid = clp->cl_clientid; 4301 status = nfs4_set_lock_state(state, request); 4302 if (status != 0) 4303 goto out; 4304 lsp = request->fl_u.nfs4_fl.owner; 4305 arg.lock_owner.id = lsp->ls_seqid.owner_id; 4306 arg.lock_owner.s_dev = server->s_dev; 4307 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4308 switch (status) { 4309 case 0: 4310 request->fl_type = F_UNLCK; 4311 break; 4312 case -NFS4ERR_DENIED: 4313 status = 0; 4314 } 4315 request->fl_ops->fl_release_private(request); 4316 out: 4317 return status; 4318 } 4319 4320 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4321 { 4322 struct nfs4_exception exception = { }; 4323 int err; 4324 4325 do { 4326 err = nfs4_handle_exception(NFS_SERVER(state->inode), 4327 _nfs4_proc_getlk(state, cmd, request), 4328 &exception); 4329 } while (exception.retry); 4330 return err; 4331 } 4332 4333 static int do_vfs_lock(struct file *file, struct file_lock *fl) 4334 { 4335 int res = 0; 4336 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 4337 case FL_POSIX: 4338 res = posix_lock_file_wait(file, fl); 4339 break; 4340 case FL_FLOCK: 4341 res = flock_lock_file_wait(file, fl); 4342 break; 4343 default: 4344 BUG(); 4345 } 4346 return res; 4347 } 4348 4349 struct nfs4_unlockdata { 4350 struct nfs_locku_args arg; 4351 struct nfs_locku_res res; 4352 struct nfs4_lock_state *lsp; 4353 struct nfs_open_context *ctx; 4354 struct file_lock fl; 4355 const struct nfs_server *server; 4356 unsigned long timestamp; 4357 }; 4358 4359 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 4360 struct nfs_open_context *ctx, 4361 struct nfs4_lock_state *lsp, 4362 struct nfs_seqid *seqid) 4363 { 4364 struct nfs4_unlockdata *p; 4365 struct inode *inode = lsp->ls_state->inode; 4366 4367 p = kzalloc(sizeof(*p), GFP_NOFS); 4368 if (p == NULL) 4369 return NULL; 4370 p->arg.fh = NFS_FH(inode); 4371 p->arg.fl = &p->fl; 4372 p->arg.seqid = seqid; 4373 p->res.seqid = seqid; 4374 p->arg.stateid = &lsp->ls_stateid; 4375 p->lsp = lsp; 4376 atomic_inc(&lsp->ls_count); 4377 /* Ensure we don't close file until we're done freeing locks! */ 4378 p->ctx = get_nfs_open_context(ctx); 4379 memcpy(&p->fl, fl, sizeof(p->fl)); 4380 p->server = NFS_SERVER(inode); 4381 return p; 4382 } 4383 4384 static void nfs4_locku_release_calldata(void *data) 4385 { 4386 struct nfs4_unlockdata *calldata = data; 4387 nfs_free_seqid(calldata->arg.seqid); 4388 nfs4_put_lock_state(calldata->lsp); 4389 put_nfs_open_context(calldata->ctx); 4390 kfree(calldata); 4391 } 4392 4393 static void nfs4_locku_done(struct rpc_task *task, void *data) 4394 { 4395 struct nfs4_unlockdata *calldata = data; 4396 4397 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 4398 return; 4399 switch (task->tk_status) { 4400 case 0: 4401 nfs4_stateid_copy(&calldata->lsp->ls_stateid, 4402 &calldata->res.stateid); 4403 renew_lease(calldata->server, calldata->timestamp); 4404 break; 4405 case -NFS4ERR_BAD_STATEID: 4406 case -NFS4ERR_OLD_STATEID: 4407 case -NFS4ERR_STALE_STATEID: 4408 case -NFS4ERR_EXPIRED: 4409 break; 4410 default: 4411 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN) 4412 rpc_restart_call_prepare(task); 4413 } 4414 nfs_release_seqid(calldata->arg.seqid); 4415 } 4416 4417 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 4418 { 4419 struct nfs4_unlockdata *calldata = data; 4420 4421 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 4422 return; 4423 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 4424 /* Note: exit _without_ running nfs4_locku_done */ 4425 task->tk_action = NULL; 4426 nfs4_sequence_done(task, &calldata->res.seq_res); 4427 return; 4428 } 4429 calldata->timestamp = jiffies; 4430 if (nfs4_setup_sequence(calldata->server, 4431 &calldata->arg.seq_args, 4432 &calldata->res.seq_res, 4433 task) != 0) 4434 nfs_release_seqid(calldata->arg.seqid); 4435 } 4436 4437 static const struct rpc_call_ops nfs4_locku_ops = { 4438 .rpc_call_prepare = nfs4_locku_prepare, 4439 .rpc_call_done = nfs4_locku_done, 4440 .rpc_release = nfs4_locku_release_calldata, 4441 }; 4442 4443 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 4444 struct nfs_open_context *ctx, 4445 struct nfs4_lock_state *lsp, 4446 struct nfs_seqid *seqid) 4447 { 4448 struct nfs4_unlockdata *data; 4449 struct rpc_message msg = { 4450 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 4451 .rpc_cred = ctx->cred, 4452 }; 4453 struct rpc_task_setup task_setup_data = { 4454 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 4455 .rpc_message = &msg, 4456 .callback_ops = &nfs4_locku_ops, 4457 .workqueue = nfsiod_workqueue, 4458 .flags = RPC_TASK_ASYNC, 4459 }; 4460 4461 /* Ensure this is an unlock - when canceling a lock, the 4462 * canceled lock is passed in, and it won't be an unlock. 4463 */ 4464 fl->fl_type = F_UNLCK; 4465 4466 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 4467 if (data == NULL) { 4468 nfs_free_seqid(seqid); 4469 return ERR_PTR(-ENOMEM); 4470 } 4471 4472 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 4473 msg.rpc_argp = &data->arg; 4474 msg.rpc_resp = &data->res; 4475 task_setup_data.callback_data = data; 4476 return rpc_run_task(&task_setup_data); 4477 } 4478 4479 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 4480 { 4481 struct nfs_inode *nfsi = NFS_I(state->inode); 4482 struct nfs_seqid *seqid; 4483 struct nfs4_lock_state *lsp; 4484 struct rpc_task *task; 4485 int status = 0; 4486 unsigned char fl_flags = request->fl_flags; 4487 4488 status = nfs4_set_lock_state(state, request); 4489 /* Unlock _before_ we do the RPC call */ 4490 request->fl_flags |= FL_EXISTS; 4491 down_read(&nfsi->rwsem); 4492 if (do_vfs_lock(request->fl_file, request) == -ENOENT) { 4493 up_read(&nfsi->rwsem); 4494 goto out; 4495 } 4496 up_read(&nfsi->rwsem); 4497 if (status != 0) 4498 goto out; 4499 /* Is this a delegated lock? */ 4500 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) 4501 goto out; 4502 lsp = request->fl_u.nfs4_fl.owner; 4503 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 4504 status = -ENOMEM; 4505 if (seqid == NULL) 4506 goto out; 4507 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 4508 status = PTR_ERR(task); 4509 if (IS_ERR(task)) 4510 goto out; 4511 status = nfs4_wait_for_completion_rpc_task(task); 4512 rpc_put_task(task); 4513 out: 4514 request->fl_flags = fl_flags; 4515 return status; 4516 } 4517 4518 struct nfs4_lockdata { 4519 struct nfs_lock_args arg; 4520 struct nfs_lock_res res; 4521 struct nfs4_lock_state *lsp; 4522 struct nfs_open_context *ctx; 4523 struct file_lock fl; 4524 unsigned long timestamp; 4525 int rpc_status; 4526 int cancelled; 4527 struct nfs_server *server; 4528 }; 4529 4530 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 4531 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 4532 gfp_t gfp_mask) 4533 { 4534 struct nfs4_lockdata *p; 4535 struct inode *inode = lsp->ls_state->inode; 4536 struct nfs_server *server = NFS_SERVER(inode); 4537 4538 p = kzalloc(sizeof(*p), gfp_mask); 4539 if (p == NULL) 4540 return NULL; 4541 4542 p->arg.fh = NFS_FH(inode); 4543 p->arg.fl = &p->fl; 4544 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 4545 if (p->arg.open_seqid == NULL) 4546 goto out_free; 4547 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask); 4548 if (p->arg.lock_seqid == NULL) 4549 goto out_free_seqid; 4550 p->arg.lock_stateid = &lsp->ls_stateid; 4551 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 4552 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 4553 p->arg.lock_owner.s_dev = server->s_dev; 4554 p->res.lock_seqid = p->arg.lock_seqid; 4555 p->lsp = lsp; 4556 p->server = server; 4557 atomic_inc(&lsp->ls_count); 4558 p->ctx = get_nfs_open_context(ctx); 4559 memcpy(&p->fl, fl, sizeof(p->fl)); 4560 return p; 4561 out_free_seqid: 4562 nfs_free_seqid(p->arg.open_seqid); 4563 out_free: 4564 kfree(p); 4565 return NULL; 4566 } 4567 4568 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 4569 { 4570 struct nfs4_lockdata *data = calldata; 4571 struct nfs4_state *state = data->lsp->ls_state; 4572 4573 dprintk("%s: begin!\n", __func__); 4574 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 4575 return; 4576 /* Do we need to do an open_to_lock_owner? */ 4577 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 4578 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 4579 goto out_release_lock_seqid; 4580 } 4581 data->arg.open_stateid = &state->stateid; 4582 data->arg.new_lock_owner = 1; 4583 data->res.open_seqid = data->arg.open_seqid; 4584 } else 4585 data->arg.new_lock_owner = 0; 4586 data->timestamp = jiffies; 4587 if (nfs4_setup_sequence(data->server, 4588 &data->arg.seq_args, 4589 &data->res.seq_res, 4590 task) == 0) 4591 return; 4592 nfs_release_seqid(data->arg.open_seqid); 4593 out_release_lock_seqid: 4594 nfs_release_seqid(data->arg.lock_seqid); 4595 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status); 4596 } 4597 4598 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 4599 { 4600 struct nfs4_lockdata *data = calldata; 4601 4602 dprintk("%s: begin!\n", __func__); 4603 4604 if (!nfs4_sequence_done(task, &data->res.seq_res)) 4605 return; 4606 4607 data->rpc_status = task->tk_status; 4608 if (data->arg.new_lock_owner != 0) { 4609 if (data->rpc_status == 0) 4610 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 4611 else 4612 goto out; 4613 } 4614 if (data->rpc_status == 0) { 4615 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid); 4616 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags); 4617 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); 4618 } 4619 out: 4620 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status); 4621 } 4622 4623 static void nfs4_lock_release(void *calldata) 4624 { 4625 struct nfs4_lockdata *data = calldata; 4626 4627 dprintk("%s: begin!\n", __func__); 4628 nfs_free_seqid(data->arg.open_seqid); 4629 if (data->cancelled != 0) { 4630 struct rpc_task *task; 4631 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 4632 data->arg.lock_seqid); 4633 if (!IS_ERR(task)) 4634 rpc_put_task_async(task); 4635 dprintk("%s: cancelling lock!\n", __func__); 4636 } else 4637 nfs_free_seqid(data->arg.lock_seqid); 4638 nfs4_put_lock_state(data->lsp); 4639 put_nfs_open_context(data->ctx); 4640 kfree(data); 4641 dprintk("%s: done!\n", __func__); 4642 } 4643 4644 static const struct rpc_call_ops nfs4_lock_ops = { 4645 .rpc_call_prepare = nfs4_lock_prepare, 4646 .rpc_call_done = nfs4_lock_done, 4647 .rpc_release = nfs4_lock_release, 4648 }; 4649 4650 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 4651 { 4652 switch (error) { 4653 case -NFS4ERR_ADMIN_REVOKED: 4654 case -NFS4ERR_BAD_STATEID: 4655 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 4656 if (new_lock_owner != 0 || 4657 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 4658 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 4659 break; 4660 case -NFS4ERR_STALE_STATEID: 4661 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 4662 case -NFS4ERR_EXPIRED: 4663 nfs4_schedule_lease_recovery(server->nfs_client); 4664 }; 4665 } 4666 4667 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 4668 { 4669 struct nfs4_lockdata *data; 4670 struct rpc_task *task; 4671 struct rpc_message msg = { 4672 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 4673 .rpc_cred = state->owner->so_cred, 4674 }; 4675 struct rpc_task_setup task_setup_data = { 4676 .rpc_client = NFS_CLIENT(state->inode), 4677 .rpc_message = &msg, 4678 .callback_ops = &nfs4_lock_ops, 4679 .workqueue = nfsiod_workqueue, 4680 .flags = RPC_TASK_ASYNC, 4681 }; 4682 int ret; 4683 4684 dprintk("%s: begin!\n", __func__); 4685 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 4686 fl->fl_u.nfs4_fl.owner, 4687 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS); 4688 if (data == NULL) 4689 return -ENOMEM; 4690 if (IS_SETLKW(cmd)) 4691 data->arg.block = 1; 4692 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1); 4693 msg.rpc_argp = &data->arg; 4694 msg.rpc_resp = &data->res; 4695 task_setup_data.callback_data = data; 4696 if (recovery_type > NFS_LOCK_NEW) { 4697 if (recovery_type == NFS_LOCK_RECLAIM) 4698 data->arg.reclaim = NFS_LOCK_RECLAIM; 4699 nfs4_set_sequence_privileged(&data->arg.seq_args); 4700 } 4701 task = rpc_run_task(&task_setup_data); 4702 if (IS_ERR(task)) 4703 return PTR_ERR(task); 4704 ret = nfs4_wait_for_completion_rpc_task(task); 4705 if (ret == 0) { 4706 ret = data->rpc_status; 4707 if (ret) 4708 nfs4_handle_setlk_error(data->server, data->lsp, 4709 data->arg.new_lock_owner, ret); 4710 } else 4711 data->cancelled = 1; 4712 rpc_put_task(task); 4713 dprintk("%s: done, ret = %d!\n", __func__, ret); 4714 return ret; 4715 } 4716 4717 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 4718 { 4719 struct nfs_server *server = NFS_SERVER(state->inode); 4720 struct nfs4_exception exception = { 4721 .inode = state->inode, 4722 }; 4723 int err; 4724 4725 do { 4726 /* Cache the lock if possible... */ 4727 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 4728 return 0; 4729 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 4730 if (err != -NFS4ERR_DELAY) 4731 break; 4732 nfs4_handle_exception(server, err, &exception); 4733 } while (exception.retry); 4734 return err; 4735 } 4736 4737 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 4738 { 4739 struct nfs_server *server = NFS_SERVER(state->inode); 4740 struct nfs4_exception exception = { 4741 .inode = state->inode, 4742 }; 4743 int err; 4744 4745 err = nfs4_set_lock_state(state, request); 4746 if (err != 0) 4747 return err; 4748 do { 4749 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 4750 return 0; 4751 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 4752 switch (err) { 4753 default: 4754 goto out; 4755 case -NFS4ERR_GRACE: 4756 case -NFS4ERR_DELAY: 4757 nfs4_handle_exception(server, err, &exception); 4758 err = 0; 4759 } 4760 } while (exception.retry); 4761 out: 4762 return err; 4763 } 4764 4765 #if defined(CONFIG_NFS_V4_1) 4766 /** 4767 * nfs41_check_expired_locks - possibly free a lock stateid 4768 * 4769 * @state: NFSv4 state for an inode 4770 * 4771 * Returns NFS_OK if recovery for this stateid is now finished. 4772 * Otherwise a negative NFS4ERR value is returned. 4773 */ 4774 static int nfs41_check_expired_locks(struct nfs4_state *state) 4775 { 4776 int status, ret = -NFS4ERR_BAD_STATEID; 4777 struct nfs4_lock_state *lsp; 4778 struct nfs_server *server = NFS_SERVER(state->inode); 4779 4780 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 4781 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 4782 status = nfs41_test_stateid(server, &lsp->ls_stateid); 4783 if (status != NFS_OK) { 4784 /* Free the stateid unless the server 4785 * informs us the stateid is unrecognized. */ 4786 if (status != -NFS4ERR_BAD_STATEID) 4787 nfs41_free_stateid(server, 4788 &lsp->ls_stateid); 4789 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 4790 ret = status; 4791 } 4792 } 4793 }; 4794 4795 return ret; 4796 } 4797 4798 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 4799 { 4800 int status = NFS_OK; 4801 4802 if (test_bit(LK_STATE_IN_USE, &state->flags)) 4803 status = nfs41_check_expired_locks(state); 4804 if (status != NFS_OK) 4805 status = nfs4_lock_expired(state, request); 4806 return status; 4807 } 4808 #endif 4809 4810 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4811 { 4812 struct nfs_inode *nfsi = NFS_I(state->inode); 4813 unsigned char fl_flags = request->fl_flags; 4814 int status = -ENOLCK; 4815 4816 if ((fl_flags & FL_POSIX) && 4817 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 4818 goto out; 4819 /* Is this a delegated open? */ 4820 status = nfs4_set_lock_state(state, request); 4821 if (status != 0) 4822 goto out; 4823 request->fl_flags |= FL_ACCESS; 4824 status = do_vfs_lock(request->fl_file, request); 4825 if (status < 0) 4826 goto out; 4827 down_read(&nfsi->rwsem); 4828 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 4829 /* Yes: cache locks! */ 4830 /* ...but avoid races with delegation recall... */ 4831 request->fl_flags = fl_flags & ~FL_SLEEP; 4832 status = do_vfs_lock(request->fl_file, request); 4833 goto out_unlock; 4834 } 4835 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 4836 if (status != 0) 4837 goto out_unlock; 4838 /* Note: we always want to sleep here! */ 4839 request->fl_flags = fl_flags | FL_SLEEP; 4840 if (do_vfs_lock(request->fl_file, request) < 0) 4841 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock " 4842 "manager!\n", __func__); 4843 out_unlock: 4844 up_read(&nfsi->rwsem); 4845 out: 4846 request->fl_flags = fl_flags; 4847 return status; 4848 } 4849 4850 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 4851 { 4852 struct nfs4_exception exception = { 4853 .state = state, 4854 .inode = state->inode, 4855 }; 4856 int err; 4857 4858 do { 4859 err = _nfs4_proc_setlk(state, cmd, request); 4860 if (err == -NFS4ERR_DENIED) 4861 err = -EAGAIN; 4862 err = nfs4_handle_exception(NFS_SERVER(state->inode), 4863 err, &exception); 4864 } while (exception.retry); 4865 return err; 4866 } 4867 4868 static int 4869 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 4870 { 4871 struct nfs_open_context *ctx; 4872 struct nfs4_state *state; 4873 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 4874 int status; 4875 4876 /* verify open state */ 4877 ctx = nfs_file_open_context(filp); 4878 state = ctx->state; 4879 4880 if (request->fl_start < 0 || request->fl_end < 0) 4881 return -EINVAL; 4882 4883 if (IS_GETLK(cmd)) { 4884 if (state != NULL) 4885 return nfs4_proc_getlk(state, F_GETLK, request); 4886 return 0; 4887 } 4888 4889 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 4890 return -EINVAL; 4891 4892 if (request->fl_type == F_UNLCK) { 4893 if (state != NULL) 4894 return nfs4_proc_unlck(state, cmd, request); 4895 return 0; 4896 } 4897 4898 if (state == NULL) 4899 return -ENOLCK; 4900 /* 4901 * Don't rely on the VFS having checked the file open mode, 4902 * since it won't do this for flock() locks. 4903 */ 4904 switch (request->fl_type) { 4905 case F_RDLCK: 4906 if (!(filp->f_mode & FMODE_READ)) 4907 return -EBADF; 4908 break; 4909 case F_WRLCK: 4910 if (!(filp->f_mode & FMODE_WRITE)) 4911 return -EBADF; 4912 } 4913 4914 do { 4915 status = nfs4_proc_setlk(state, cmd, request); 4916 if ((status != -EAGAIN) || IS_SETLK(cmd)) 4917 break; 4918 timeout = nfs4_set_lock_task_retry(timeout); 4919 status = -ERESTARTSYS; 4920 if (signalled()) 4921 break; 4922 } while(status < 0); 4923 return status; 4924 } 4925 4926 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) 4927 { 4928 struct nfs_server *server = NFS_SERVER(state->inode); 4929 struct nfs4_exception exception = { }; 4930 int err; 4931 4932 err = nfs4_set_lock_state(state, fl); 4933 if (err != 0) 4934 goto out; 4935 do { 4936 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 4937 switch (err) { 4938 default: 4939 printk(KERN_ERR "NFS: %s: unhandled error " 4940 "%d.\n", __func__, err); 4941 case 0: 4942 case -ESTALE: 4943 goto out; 4944 case -NFS4ERR_EXPIRED: 4945 nfs4_schedule_stateid_recovery(server, state); 4946 case -NFS4ERR_STALE_CLIENTID: 4947 case -NFS4ERR_STALE_STATEID: 4948 nfs4_schedule_lease_recovery(server->nfs_client); 4949 goto out; 4950 case -NFS4ERR_BADSESSION: 4951 case -NFS4ERR_BADSLOT: 4952 case -NFS4ERR_BAD_HIGH_SLOT: 4953 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 4954 case -NFS4ERR_DEADSESSION: 4955 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); 4956 goto out; 4957 case -ERESTARTSYS: 4958 /* 4959 * The show must go on: exit, but mark the 4960 * stateid as needing recovery. 4961 */ 4962 case -NFS4ERR_DELEG_REVOKED: 4963 case -NFS4ERR_ADMIN_REVOKED: 4964 case -NFS4ERR_BAD_STATEID: 4965 case -NFS4ERR_OPENMODE: 4966 nfs4_schedule_stateid_recovery(server, state); 4967 err = 0; 4968 goto out; 4969 case -ENOMEM: 4970 case -NFS4ERR_DENIED: 4971 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 4972 err = 0; 4973 goto out; 4974 case -NFS4ERR_DELAY: 4975 break; 4976 } 4977 err = nfs4_handle_exception(server, err, &exception); 4978 } while (exception.retry); 4979 out: 4980 return err; 4981 } 4982 4983 struct nfs_release_lockowner_data { 4984 struct nfs4_lock_state *lsp; 4985 struct nfs_server *server; 4986 struct nfs_release_lockowner_args args; 4987 }; 4988 4989 static void nfs4_release_lockowner_release(void *calldata) 4990 { 4991 struct nfs_release_lockowner_data *data = calldata; 4992 nfs4_free_lock_state(data->server, data->lsp); 4993 kfree(calldata); 4994 } 4995 4996 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 4997 .rpc_release = nfs4_release_lockowner_release, 4998 }; 4999 5000 int nfs4_release_lockowner(struct nfs4_lock_state *lsp) 5001 { 5002 struct nfs_server *server = lsp->ls_state->owner->so_server; 5003 struct nfs_release_lockowner_data *data; 5004 struct rpc_message msg = { 5005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 5006 }; 5007 5008 if (server->nfs_client->cl_mvops->minor_version != 0) 5009 return -EINVAL; 5010 data = kmalloc(sizeof(*data), GFP_NOFS); 5011 if (!data) 5012 return -ENOMEM; 5013 data->lsp = lsp; 5014 data->server = server; 5015 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 5016 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 5017 data->args.lock_owner.s_dev = server->s_dev; 5018 msg.rpc_argp = &data->args; 5019 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 5020 return 0; 5021 } 5022 5023 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 5024 5025 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key, 5026 const void *buf, size_t buflen, 5027 int flags, int type) 5028 { 5029 if (strcmp(key, "") != 0) 5030 return -EINVAL; 5031 5032 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen); 5033 } 5034 5035 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key, 5036 void *buf, size_t buflen, int type) 5037 { 5038 if (strcmp(key, "") != 0) 5039 return -EINVAL; 5040 5041 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen); 5042 } 5043 5044 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list, 5045 size_t list_len, const char *name, 5046 size_t name_len, int type) 5047 { 5048 size_t len = sizeof(XATTR_NAME_NFSV4_ACL); 5049 5050 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 5051 return 0; 5052 5053 if (list && len <= list_len) 5054 memcpy(list, XATTR_NAME_NFSV4_ACL, len); 5055 return len; 5056 } 5057 5058 /* 5059 * nfs_fhget will use either the mounted_on_fileid or the fileid 5060 */ 5061 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 5062 { 5063 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 5064 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 5065 (fattr->valid & NFS_ATTR_FATTR_FSID) && 5066 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 5067 return; 5068 5069 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 5070 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 5071 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 5072 fattr->nlink = 2; 5073 } 5074 5075 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 5076 const struct qstr *name, 5077 struct nfs4_fs_locations *fs_locations, 5078 struct page *page) 5079 { 5080 struct nfs_server *server = NFS_SERVER(dir); 5081 u32 bitmask[2] = { 5082 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 5083 }; 5084 struct nfs4_fs_locations_arg args = { 5085 .dir_fh = NFS_FH(dir), 5086 .name = name, 5087 .page = page, 5088 .bitmask = bitmask, 5089 }; 5090 struct nfs4_fs_locations_res res = { 5091 .fs_locations = fs_locations, 5092 }; 5093 struct rpc_message msg = { 5094 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 5095 .rpc_argp = &args, 5096 .rpc_resp = &res, 5097 }; 5098 int status; 5099 5100 dprintk("%s: start\n", __func__); 5101 5102 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 5103 * is not supported */ 5104 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 5105 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID; 5106 else 5107 bitmask[0] |= FATTR4_WORD0_FILEID; 5108 5109 nfs_fattr_init(&fs_locations->fattr); 5110 fs_locations->server = server; 5111 fs_locations->nlocations = 0; 5112 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 5113 dprintk("%s: returned status = %d\n", __func__, status); 5114 return status; 5115 } 5116 5117 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 5118 const struct qstr *name, 5119 struct nfs4_fs_locations *fs_locations, 5120 struct page *page) 5121 { 5122 struct nfs4_exception exception = { }; 5123 int err; 5124 do { 5125 err = nfs4_handle_exception(NFS_SERVER(dir), 5126 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page), 5127 &exception); 5128 } while (exception.retry); 5129 return err; 5130 } 5131 5132 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors) 5133 { 5134 int status; 5135 struct nfs4_secinfo_arg args = { 5136 .dir_fh = NFS_FH(dir), 5137 .name = name, 5138 }; 5139 struct nfs4_secinfo_res res = { 5140 .flavors = flavors, 5141 }; 5142 struct rpc_message msg = { 5143 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 5144 .rpc_argp = &args, 5145 .rpc_resp = &res, 5146 }; 5147 5148 dprintk("NFS call secinfo %s\n", name->name); 5149 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0); 5150 dprintk("NFS reply secinfo: %d\n", status); 5151 return status; 5152 } 5153 5154 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 5155 struct nfs4_secinfo_flavors *flavors) 5156 { 5157 struct nfs4_exception exception = { }; 5158 int err; 5159 do { 5160 err = nfs4_handle_exception(NFS_SERVER(dir), 5161 _nfs4_proc_secinfo(dir, name, flavors), 5162 &exception); 5163 } while (exception.retry); 5164 return err; 5165 } 5166 5167 #ifdef CONFIG_NFS_V4_1 5168 /* 5169 * Check the exchange flags returned by the server for invalid flags, having 5170 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 5171 * DS flags set. 5172 */ 5173 static int nfs4_check_cl_exchange_flags(u32 flags) 5174 { 5175 if (flags & ~EXCHGID4_FLAG_MASK_R) 5176 goto out_inval; 5177 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 5178 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 5179 goto out_inval; 5180 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 5181 goto out_inval; 5182 return NFS_OK; 5183 out_inval: 5184 return -NFS4ERR_INVAL; 5185 } 5186 5187 static bool 5188 nfs41_same_server_scope(struct nfs41_server_scope *a, 5189 struct nfs41_server_scope *b) 5190 { 5191 if (a->server_scope_sz == b->server_scope_sz && 5192 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0) 5193 return true; 5194 5195 return false; 5196 } 5197 5198 /* 5199 * nfs4_proc_bind_conn_to_session() 5200 * 5201 * The 4.1 client currently uses the same TCP connection for the 5202 * fore and backchannel. 5203 */ 5204 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred) 5205 { 5206 int status; 5207 struct nfs41_bind_conn_to_session_res res; 5208 struct rpc_message msg = { 5209 .rpc_proc = 5210 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 5211 .rpc_argp = clp, 5212 .rpc_resp = &res, 5213 .rpc_cred = cred, 5214 }; 5215 5216 dprintk("--> %s\n", __func__); 5217 5218 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS); 5219 if (unlikely(res.session == NULL)) { 5220 status = -ENOMEM; 5221 goto out; 5222 } 5223 5224 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5225 if (status == 0) { 5226 if (memcmp(res.session->sess_id.data, 5227 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 5228 dprintk("NFS: %s: Session ID mismatch\n", __func__); 5229 status = -EIO; 5230 goto out_session; 5231 } 5232 if (res.dir != NFS4_CDFS4_BOTH) { 5233 dprintk("NFS: %s: Unexpected direction from server\n", 5234 __func__); 5235 status = -EIO; 5236 goto out_session; 5237 } 5238 if (res.use_conn_in_rdma_mode) { 5239 dprintk("NFS: %s: Server returned RDMA mode = true\n", 5240 __func__); 5241 status = -EIO; 5242 goto out_session; 5243 } 5244 } 5245 out_session: 5246 kfree(res.session); 5247 out: 5248 dprintk("<-- %s status= %d\n", __func__, status); 5249 return status; 5250 } 5251 5252 /* 5253 * nfs4_proc_exchange_id() 5254 * 5255 * Returns zero, a negative errno, or a negative NFS4ERR status code. 5256 * 5257 * Since the clientid has expired, all compounds using sessions 5258 * associated with the stale clientid will be returning 5259 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 5260 * be in some phase of session reset. 5261 */ 5262 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) 5263 { 5264 nfs4_verifier verifier; 5265 struct nfs41_exchange_id_args args = { 5266 .verifier = &verifier, 5267 .client = clp, 5268 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER, 5269 }; 5270 struct nfs41_exchange_id_res res = { 5271 0 5272 }; 5273 int status; 5274 struct rpc_message msg = { 5275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 5276 .rpc_argp = &args, 5277 .rpc_resp = &res, 5278 .rpc_cred = cred, 5279 }; 5280 5281 nfs4_init_boot_verifier(clp, &verifier); 5282 args.id_len = nfs4_init_uniform_client_string(clp, args.id, 5283 sizeof(args.id)); 5284 dprintk("NFS call exchange_id auth=%s, '%.*s'\n", 5285 clp->cl_rpcclient->cl_auth->au_ops->au_name, 5286 args.id_len, args.id); 5287 5288 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 5289 GFP_NOFS); 5290 if (unlikely(res.server_owner == NULL)) { 5291 status = -ENOMEM; 5292 goto out; 5293 } 5294 5295 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 5296 GFP_NOFS); 5297 if (unlikely(res.server_scope == NULL)) { 5298 status = -ENOMEM; 5299 goto out_server_owner; 5300 } 5301 5302 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 5303 if (unlikely(res.impl_id == NULL)) { 5304 status = -ENOMEM; 5305 goto out_server_scope; 5306 } 5307 5308 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5309 if (status == 0) 5310 status = nfs4_check_cl_exchange_flags(res.flags); 5311 5312 if (status == 0) { 5313 clp->cl_clientid = res.clientid; 5314 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R); 5315 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) 5316 clp->cl_seqid = res.seqid; 5317 5318 kfree(clp->cl_serverowner); 5319 clp->cl_serverowner = res.server_owner; 5320 res.server_owner = NULL; 5321 5322 /* use the most recent implementation id */ 5323 kfree(clp->cl_implid); 5324 clp->cl_implid = res.impl_id; 5325 5326 if (clp->cl_serverscope != NULL && 5327 !nfs41_same_server_scope(clp->cl_serverscope, 5328 res.server_scope)) { 5329 dprintk("%s: server_scope mismatch detected\n", 5330 __func__); 5331 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 5332 kfree(clp->cl_serverscope); 5333 clp->cl_serverscope = NULL; 5334 } 5335 5336 if (clp->cl_serverscope == NULL) { 5337 clp->cl_serverscope = res.server_scope; 5338 goto out; 5339 } 5340 } else 5341 kfree(res.impl_id); 5342 5343 out_server_owner: 5344 kfree(res.server_owner); 5345 out_server_scope: 5346 kfree(res.server_scope); 5347 out: 5348 if (clp->cl_implid != NULL) 5349 dprintk("NFS reply exchange_id: Server Implementation ID: " 5350 "domain: %s, name: %s, date: %llu,%u\n", 5351 clp->cl_implid->domain, clp->cl_implid->name, 5352 clp->cl_implid->date.seconds, 5353 clp->cl_implid->date.nseconds); 5354 dprintk("NFS reply exchange_id: %d\n", status); 5355 return status; 5356 } 5357 5358 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 5359 struct rpc_cred *cred) 5360 { 5361 struct rpc_message msg = { 5362 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 5363 .rpc_argp = clp, 5364 .rpc_cred = cred, 5365 }; 5366 int status; 5367 5368 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5369 if (status) 5370 dprintk("NFS: Got error %d from the server %s on " 5371 "DESTROY_CLIENTID.", status, clp->cl_hostname); 5372 return status; 5373 } 5374 5375 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 5376 struct rpc_cred *cred) 5377 { 5378 unsigned int loop; 5379 int ret; 5380 5381 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 5382 ret = _nfs4_proc_destroy_clientid(clp, cred); 5383 switch (ret) { 5384 case -NFS4ERR_DELAY: 5385 case -NFS4ERR_CLIENTID_BUSY: 5386 ssleep(1); 5387 break; 5388 default: 5389 return ret; 5390 } 5391 } 5392 return 0; 5393 } 5394 5395 int nfs4_destroy_clientid(struct nfs_client *clp) 5396 { 5397 struct rpc_cred *cred; 5398 int ret = 0; 5399 5400 if (clp->cl_mvops->minor_version < 1) 5401 goto out; 5402 if (clp->cl_exchange_flags == 0) 5403 goto out; 5404 if (clp->cl_preserve_clid) 5405 goto out; 5406 cred = nfs4_get_exchange_id_cred(clp); 5407 ret = nfs4_proc_destroy_clientid(clp, cred); 5408 if (cred) 5409 put_rpccred(cred); 5410 switch (ret) { 5411 case 0: 5412 case -NFS4ERR_STALE_CLIENTID: 5413 clp->cl_exchange_flags = 0; 5414 } 5415 out: 5416 return ret; 5417 } 5418 5419 struct nfs4_get_lease_time_data { 5420 struct nfs4_get_lease_time_args *args; 5421 struct nfs4_get_lease_time_res *res; 5422 struct nfs_client *clp; 5423 }; 5424 5425 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 5426 void *calldata) 5427 { 5428 struct nfs4_get_lease_time_data *data = 5429 (struct nfs4_get_lease_time_data *)calldata; 5430 5431 dprintk("--> %s\n", __func__); 5432 /* just setup sequence, do not trigger session recovery 5433 since we're invoked within one */ 5434 nfs41_setup_sequence(data->clp->cl_session, 5435 &data->args->la_seq_args, 5436 &data->res->lr_seq_res, 5437 task); 5438 dprintk("<-- %s\n", __func__); 5439 } 5440 5441 /* 5442 * Called from nfs4_state_manager thread for session setup, so don't recover 5443 * from sequence operation or clientid errors. 5444 */ 5445 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 5446 { 5447 struct nfs4_get_lease_time_data *data = 5448 (struct nfs4_get_lease_time_data *)calldata; 5449 5450 dprintk("--> %s\n", __func__); 5451 if (!nfs41_sequence_done(task, &data->res->lr_seq_res)) 5452 return; 5453 switch (task->tk_status) { 5454 case -NFS4ERR_DELAY: 5455 case -NFS4ERR_GRACE: 5456 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status); 5457 rpc_delay(task, NFS4_POLL_RETRY_MIN); 5458 task->tk_status = 0; 5459 /* fall through */ 5460 case -NFS4ERR_RETRY_UNCACHED_REP: 5461 rpc_restart_call_prepare(task); 5462 return; 5463 } 5464 dprintk("<-- %s\n", __func__); 5465 } 5466 5467 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 5468 .rpc_call_prepare = nfs4_get_lease_time_prepare, 5469 .rpc_call_done = nfs4_get_lease_time_done, 5470 }; 5471 5472 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 5473 { 5474 struct rpc_task *task; 5475 struct nfs4_get_lease_time_args args; 5476 struct nfs4_get_lease_time_res res = { 5477 .lr_fsinfo = fsinfo, 5478 }; 5479 struct nfs4_get_lease_time_data data = { 5480 .args = &args, 5481 .res = &res, 5482 .clp = clp, 5483 }; 5484 struct rpc_message msg = { 5485 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 5486 .rpc_argp = &args, 5487 .rpc_resp = &res, 5488 }; 5489 struct rpc_task_setup task_setup = { 5490 .rpc_client = clp->cl_rpcclient, 5491 .rpc_message = &msg, 5492 .callback_ops = &nfs4_get_lease_time_ops, 5493 .callback_data = &data, 5494 .flags = RPC_TASK_TIMEOUT, 5495 }; 5496 int status; 5497 5498 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0); 5499 nfs4_set_sequence_privileged(&args.la_seq_args); 5500 dprintk("--> %s\n", __func__); 5501 task = rpc_run_task(&task_setup); 5502 5503 if (IS_ERR(task)) 5504 status = PTR_ERR(task); 5505 else { 5506 status = task->tk_status; 5507 rpc_put_task(task); 5508 } 5509 dprintk("<-- %s return %d\n", __func__, status); 5510 5511 return status; 5512 } 5513 5514 /* 5515 * Initialize the values to be used by the client in CREATE_SESSION 5516 * If nfs4_init_session set the fore channel request and response sizes, 5517 * use them. 5518 * 5519 * Set the back channel max_resp_sz_cached to zero to force the client to 5520 * always set csa_cachethis to FALSE because the current implementation 5521 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 5522 */ 5523 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 5524 { 5525 struct nfs4_session *session = args->client->cl_session; 5526 unsigned int mxrqst_sz = session->fc_target_max_rqst_sz, 5527 mxresp_sz = session->fc_target_max_resp_sz; 5528 5529 if (mxrqst_sz == 0) 5530 mxrqst_sz = NFS_MAX_FILE_IO_SIZE; 5531 if (mxresp_sz == 0) 5532 mxresp_sz = NFS_MAX_FILE_IO_SIZE; 5533 /* Fore channel attributes */ 5534 args->fc_attrs.max_rqst_sz = mxrqst_sz; 5535 args->fc_attrs.max_resp_sz = mxresp_sz; 5536 args->fc_attrs.max_ops = NFS4_MAX_OPS; 5537 args->fc_attrs.max_reqs = max_session_slots; 5538 5539 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 5540 "max_ops=%u max_reqs=%u\n", 5541 __func__, 5542 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 5543 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 5544 5545 /* Back channel attributes */ 5546 args->bc_attrs.max_rqst_sz = PAGE_SIZE; 5547 args->bc_attrs.max_resp_sz = PAGE_SIZE; 5548 args->bc_attrs.max_resp_sz_cached = 0; 5549 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 5550 args->bc_attrs.max_reqs = 1; 5551 5552 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 5553 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 5554 __func__, 5555 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 5556 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 5557 args->bc_attrs.max_reqs); 5558 } 5559 5560 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 5561 { 5562 struct nfs4_channel_attrs *sent = &args->fc_attrs; 5563 struct nfs4_channel_attrs *rcvd = &session->fc_attrs; 5564 5565 if (rcvd->max_resp_sz > sent->max_resp_sz) 5566 return -EINVAL; 5567 /* 5568 * Our requested max_ops is the minimum we need; we're not 5569 * prepared to break up compounds into smaller pieces than that. 5570 * So, no point even trying to continue if the server won't 5571 * cooperate: 5572 */ 5573 if (rcvd->max_ops < sent->max_ops) 5574 return -EINVAL; 5575 if (rcvd->max_reqs == 0) 5576 return -EINVAL; 5577 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 5578 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 5579 return 0; 5580 } 5581 5582 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session) 5583 { 5584 struct nfs4_channel_attrs *sent = &args->bc_attrs; 5585 struct nfs4_channel_attrs *rcvd = &session->bc_attrs; 5586 5587 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 5588 return -EINVAL; 5589 if (rcvd->max_resp_sz < sent->max_resp_sz) 5590 return -EINVAL; 5591 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 5592 return -EINVAL; 5593 /* These would render the backchannel useless: */ 5594 if (rcvd->max_ops != sent->max_ops) 5595 return -EINVAL; 5596 if (rcvd->max_reqs != sent->max_reqs) 5597 return -EINVAL; 5598 return 0; 5599 } 5600 5601 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 5602 struct nfs4_session *session) 5603 { 5604 int ret; 5605 5606 ret = nfs4_verify_fore_channel_attrs(args, session); 5607 if (ret) 5608 return ret; 5609 return nfs4_verify_back_channel_attrs(args, session); 5610 } 5611 5612 static int _nfs4_proc_create_session(struct nfs_client *clp, 5613 struct rpc_cred *cred) 5614 { 5615 struct nfs4_session *session = clp->cl_session; 5616 struct nfs41_create_session_args args = { 5617 .client = clp, 5618 .cb_program = NFS4_CALLBACK, 5619 }; 5620 struct nfs41_create_session_res res = { 5621 .client = clp, 5622 }; 5623 struct rpc_message msg = { 5624 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 5625 .rpc_argp = &args, 5626 .rpc_resp = &res, 5627 .rpc_cred = cred, 5628 }; 5629 int status; 5630 5631 nfs4_init_channel_attrs(&args); 5632 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 5633 5634 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5635 5636 if (!status) { 5637 /* Verify the session's negotiated channel_attrs values */ 5638 status = nfs4_verify_channel_attrs(&args, session); 5639 /* Increment the clientid slot sequence id */ 5640 clp->cl_seqid++; 5641 } 5642 5643 return status; 5644 } 5645 5646 /* 5647 * Issues a CREATE_SESSION operation to the server. 5648 * It is the responsibility of the caller to verify the session is 5649 * expired before calling this routine. 5650 */ 5651 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred) 5652 { 5653 int status; 5654 unsigned *ptr; 5655 struct nfs4_session *session = clp->cl_session; 5656 5657 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 5658 5659 status = _nfs4_proc_create_session(clp, cred); 5660 if (status) 5661 goto out; 5662 5663 /* Init or reset the session slot tables */ 5664 status = nfs4_setup_session_slot_tables(session); 5665 dprintk("slot table setup returned %d\n", status); 5666 if (status) 5667 goto out; 5668 5669 ptr = (unsigned *)&session->sess_id.data[0]; 5670 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 5671 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 5672 out: 5673 dprintk("<-- %s\n", __func__); 5674 return status; 5675 } 5676 5677 /* 5678 * Issue the over-the-wire RPC DESTROY_SESSION. 5679 * The caller must serialize access to this routine. 5680 */ 5681 int nfs4_proc_destroy_session(struct nfs4_session *session, 5682 struct rpc_cred *cred) 5683 { 5684 struct rpc_message msg = { 5685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 5686 .rpc_argp = session, 5687 .rpc_cred = cred, 5688 }; 5689 int status = 0; 5690 5691 dprintk("--> nfs4_proc_destroy_session\n"); 5692 5693 /* session is still being setup */ 5694 if (session->clp->cl_cons_state != NFS_CS_READY) 5695 return status; 5696 5697 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5698 5699 if (status) 5700 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 5701 "Session has been destroyed regardless...\n", status); 5702 5703 dprintk("<-- nfs4_proc_destroy_session\n"); 5704 return status; 5705 } 5706 5707 /* 5708 * Renew the cl_session lease. 5709 */ 5710 struct nfs4_sequence_data { 5711 struct nfs_client *clp; 5712 struct nfs4_sequence_args args; 5713 struct nfs4_sequence_res res; 5714 }; 5715 5716 static void nfs41_sequence_release(void *data) 5717 { 5718 struct nfs4_sequence_data *calldata = data; 5719 struct nfs_client *clp = calldata->clp; 5720 5721 if (atomic_read(&clp->cl_count) > 1) 5722 nfs4_schedule_state_renewal(clp); 5723 nfs_put_client(clp); 5724 kfree(calldata); 5725 } 5726 5727 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 5728 { 5729 switch(task->tk_status) { 5730 case -NFS4ERR_DELAY: 5731 rpc_delay(task, NFS4_POLL_RETRY_MAX); 5732 return -EAGAIN; 5733 default: 5734 nfs4_schedule_lease_recovery(clp); 5735 } 5736 return 0; 5737 } 5738 5739 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 5740 { 5741 struct nfs4_sequence_data *calldata = data; 5742 struct nfs_client *clp = calldata->clp; 5743 5744 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 5745 return; 5746 5747 if (task->tk_status < 0) { 5748 dprintk("%s ERROR %d\n", __func__, task->tk_status); 5749 if (atomic_read(&clp->cl_count) == 1) 5750 goto out; 5751 5752 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 5753 rpc_restart_call_prepare(task); 5754 return; 5755 } 5756 } 5757 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 5758 out: 5759 dprintk("<-- %s\n", __func__); 5760 } 5761 5762 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 5763 { 5764 struct nfs4_sequence_data *calldata = data; 5765 struct nfs_client *clp = calldata->clp; 5766 struct nfs4_sequence_args *args; 5767 struct nfs4_sequence_res *res; 5768 5769 args = task->tk_msg.rpc_argp; 5770 res = task->tk_msg.rpc_resp; 5771 5772 nfs41_setup_sequence(clp->cl_session, args, res, task); 5773 } 5774 5775 static const struct rpc_call_ops nfs41_sequence_ops = { 5776 .rpc_call_done = nfs41_sequence_call_done, 5777 .rpc_call_prepare = nfs41_sequence_prepare, 5778 .rpc_release = nfs41_sequence_release, 5779 }; 5780 5781 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 5782 struct rpc_cred *cred, 5783 bool is_privileged) 5784 { 5785 struct nfs4_sequence_data *calldata; 5786 struct rpc_message msg = { 5787 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 5788 .rpc_cred = cred, 5789 }; 5790 struct rpc_task_setup task_setup_data = { 5791 .rpc_client = clp->cl_rpcclient, 5792 .rpc_message = &msg, 5793 .callback_ops = &nfs41_sequence_ops, 5794 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT, 5795 }; 5796 5797 if (!atomic_inc_not_zero(&clp->cl_count)) 5798 return ERR_PTR(-EIO); 5799 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 5800 if (calldata == NULL) { 5801 nfs_put_client(clp); 5802 return ERR_PTR(-ENOMEM); 5803 } 5804 nfs41_init_sequence(&calldata->args, &calldata->res, 0); 5805 if (is_privileged) 5806 nfs4_set_sequence_privileged(&calldata->args); 5807 msg.rpc_argp = &calldata->args; 5808 msg.rpc_resp = &calldata->res; 5809 calldata->clp = clp; 5810 task_setup_data.callback_data = calldata; 5811 5812 return rpc_run_task(&task_setup_data); 5813 } 5814 5815 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags) 5816 { 5817 struct rpc_task *task; 5818 int ret = 0; 5819 5820 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 5821 return 0; 5822 task = _nfs41_proc_sequence(clp, cred, false); 5823 if (IS_ERR(task)) 5824 ret = PTR_ERR(task); 5825 else 5826 rpc_put_task_async(task); 5827 dprintk("<-- %s status=%d\n", __func__, ret); 5828 return ret; 5829 } 5830 5831 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred) 5832 { 5833 struct rpc_task *task; 5834 int ret; 5835 5836 task = _nfs41_proc_sequence(clp, cred, true); 5837 if (IS_ERR(task)) { 5838 ret = PTR_ERR(task); 5839 goto out; 5840 } 5841 ret = rpc_wait_for_completion_task(task); 5842 if (!ret) { 5843 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp; 5844 5845 if (task->tk_status == 0) 5846 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags); 5847 ret = task->tk_status; 5848 } 5849 rpc_put_task(task); 5850 out: 5851 dprintk("<-- %s status=%d\n", __func__, ret); 5852 return ret; 5853 } 5854 5855 struct nfs4_reclaim_complete_data { 5856 struct nfs_client *clp; 5857 struct nfs41_reclaim_complete_args arg; 5858 struct nfs41_reclaim_complete_res res; 5859 }; 5860 5861 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 5862 { 5863 struct nfs4_reclaim_complete_data *calldata = data; 5864 5865 nfs41_setup_sequence(calldata->clp->cl_session, 5866 &calldata->arg.seq_args, 5867 &calldata->res.seq_res, 5868 task); 5869 } 5870 5871 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 5872 { 5873 switch(task->tk_status) { 5874 case 0: 5875 case -NFS4ERR_COMPLETE_ALREADY: 5876 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 5877 break; 5878 case -NFS4ERR_DELAY: 5879 rpc_delay(task, NFS4_POLL_RETRY_MAX); 5880 /* fall through */ 5881 case -NFS4ERR_RETRY_UNCACHED_REP: 5882 return -EAGAIN; 5883 default: 5884 nfs4_schedule_lease_recovery(clp); 5885 } 5886 return 0; 5887 } 5888 5889 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 5890 { 5891 struct nfs4_reclaim_complete_data *calldata = data; 5892 struct nfs_client *clp = calldata->clp; 5893 struct nfs4_sequence_res *res = &calldata->res.seq_res; 5894 5895 dprintk("--> %s\n", __func__); 5896 if (!nfs41_sequence_done(task, res)) 5897 return; 5898 5899 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 5900 rpc_restart_call_prepare(task); 5901 return; 5902 } 5903 dprintk("<-- %s\n", __func__); 5904 } 5905 5906 static void nfs4_free_reclaim_complete_data(void *data) 5907 { 5908 struct nfs4_reclaim_complete_data *calldata = data; 5909 5910 kfree(calldata); 5911 } 5912 5913 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 5914 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 5915 .rpc_call_done = nfs4_reclaim_complete_done, 5916 .rpc_release = nfs4_free_reclaim_complete_data, 5917 }; 5918 5919 /* 5920 * Issue a global reclaim complete. 5921 */ 5922 static int nfs41_proc_reclaim_complete(struct nfs_client *clp) 5923 { 5924 struct nfs4_reclaim_complete_data *calldata; 5925 struct rpc_task *task; 5926 struct rpc_message msg = { 5927 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 5928 }; 5929 struct rpc_task_setup task_setup_data = { 5930 .rpc_client = clp->cl_rpcclient, 5931 .rpc_message = &msg, 5932 .callback_ops = &nfs4_reclaim_complete_call_ops, 5933 .flags = RPC_TASK_ASYNC, 5934 }; 5935 int status = -ENOMEM; 5936 5937 dprintk("--> %s\n", __func__); 5938 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 5939 if (calldata == NULL) 5940 goto out; 5941 calldata->clp = clp; 5942 calldata->arg.one_fs = 0; 5943 5944 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0); 5945 nfs4_set_sequence_privileged(&calldata->arg.seq_args); 5946 msg.rpc_argp = &calldata->arg; 5947 msg.rpc_resp = &calldata->res; 5948 task_setup_data.callback_data = calldata; 5949 task = rpc_run_task(&task_setup_data); 5950 if (IS_ERR(task)) { 5951 status = PTR_ERR(task); 5952 goto out; 5953 } 5954 status = nfs4_wait_for_completion_rpc_task(task); 5955 if (status == 0) 5956 status = task->tk_status; 5957 rpc_put_task(task); 5958 return 0; 5959 out: 5960 dprintk("<-- %s status=%d\n", __func__, status); 5961 return status; 5962 } 5963 5964 static void 5965 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 5966 { 5967 struct nfs4_layoutget *lgp = calldata; 5968 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 5969 struct nfs4_session *session = nfs4_get_session(server); 5970 5971 dprintk("--> %s\n", __func__); 5972 /* Note the is a race here, where a CB_LAYOUTRECALL can come in 5973 * right now covering the LAYOUTGET we are about to send. 5974 * However, that is not so catastrophic, and there seems 5975 * to be no way to prevent it completely. 5976 */ 5977 if (nfs41_setup_sequence(session, &lgp->args.seq_args, 5978 &lgp->res.seq_res, task)) 5979 return; 5980 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid, 5981 NFS_I(lgp->args.inode)->layout, 5982 lgp->args.ctx->state)) { 5983 rpc_exit(task, NFS4_OK); 5984 } 5985 } 5986 5987 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 5988 { 5989 struct nfs4_layoutget *lgp = calldata; 5990 struct inode *inode = lgp->args.inode; 5991 struct nfs_server *server = NFS_SERVER(inode); 5992 struct pnfs_layout_hdr *lo; 5993 struct nfs4_state *state = NULL; 5994 5995 dprintk("--> %s\n", __func__); 5996 5997 if (!nfs41_sequence_done(task, &lgp->res.seq_res)) 5998 goto out; 5999 6000 switch (task->tk_status) { 6001 case 0: 6002 goto out; 6003 case -NFS4ERR_LAYOUTTRYLATER: 6004 case -NFS4ERR_RECALLCONFLICT: 6005 task->tk_status = -NFS4ERR_DELAY; 6006 break; 6007 case -NFS4ERR_EXPIRED: 6008 case -NFS4ERR_BAD_STATEID: 6009 spin_lock(&inode->i_lock); 6010 lo = NFS_I(inode)->layout; 6011 if (!lo || list_empty(&lo->plh_segs)) { 6012 spin_unlock(&inode->i_lock); 6013 /* If the open stateid was bad, then recover it. */ 6014 state = lgp->args.ctx->state; 6015 } else { 6016 LIST_HEAD(head); 6017 6018 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL); 6019 spin_unlock(&inode->i_lock); 6020 /* Mark the bad layout state as invalid, then 6021 * retry using the open stateid. */ 6022 pnfs_free_lseg_list(&head); 6023 } 6024 } 6025 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) 6026 rpc_restart_call_prepare(task); 6027 out: 6028 dprintk("<-- %s\n", __func__); 6029 } 6030 6031 static size_t max_response_pages(struct nfs_server *server) 6032 { 6033 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 6034 return nfs_page_array_len(0, max_resp_sz); 6035 } 6036 6037 static void nfs4_free_pages(struct page **pages, size_t size) 6038 { 6039 int i; 6040 6041 if (!pages) 6042 return; 6043 6044 for (i = 0; i < size; i++) { 6045 if (!pages[i]) 6046 break; 6047 __free_page(pages[i]); 6048 } 6049 kfree(pages); 6050 } 6051 6052 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 6053 { 6054 struct page **pages; 6055 int i; 6056 6057 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 6058 if (!pages) { 6059 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 6060 return NULL; 6061 } 6062 6063 for (i = 0; i < size; i++) { 6064 pages[i] = alloc_page(gfp_flags); 6065 if (!pages[i]) { 6066 dprintk("%s: failed to allocate page\n", __func__); 6067 nfs4_free_pages(pages, size); 6068 return NULL; 6069 } 6070 } 6071 6072 return pages; 6073 } 6074 6075 static void nfs4_layoutget_release(void *calldata) 6076 { 6077 struct nfs4_layoutget *lgp = calldata; 6078 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 6079 size_t max_pages = max_response_pages(server); 6080 6081 dprintk("--> %s\n", __func__); 6082 nfs4_free_pages(lgp->args.layout.pages, max_pages); 6083 put_nfs_open_context(lgp->args.ctx); 6084 kfree(calldata); 6085 dprintk("<-- %s\n", __func__); 6086 } 6087 6088 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 6089 .rpc_call_prepare = nfs4_layoutget_prepare, 6090 .rpc_call_done = nfs4_layoutget_done, 6091 .rpc_release = nfs4_layoutget_release, 6092 }; 6093 6094 struct pnfs_layout_segment * 6095 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) 6096 { 6097 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 6098 size_t max_pages = max_response_pages(server); 6099 struct rpc_task *task; 6100 struct rpc_message msg = { 6101 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 6102 .rpc_argp = &lgp->args, 6103 .rpc_resp = &lgp->res, 6104 }; 6105 struct rpc_task_setup task_setup_data = { 6106 .rpc_client = server->client, 6107 .rpc_message = &msg, 6108 .callback_ops = &nfs4_layoutget_call_ops, 6109 .callback_data = lgp, 6110 .flags = RPC_TASK_ASYNC, 6111 }; 6112 struct pnfs_layout_segment *lseg = NULL; 6113 int status = 0; 6114 6115 dprintk("--> %s\n", __func__); 6116 6117 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 6118 if (!lgp->args.layout.pages) { 6119 nfs4_layoutget_release(lgp); 6120 return ERR_PTR(-ENOMEM); 6121 } 6122 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 6123 6124 lgp->res.layoutp = &lgp->args.layout; 6125 lgp->res.seq_res.sr_slot = NULL; 6126 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); 6127 task = rpc_run_task(&task_setup_data); 6128 if (IS_ERR(task)) 6129 return ERR_CAST(task); 6130 status = nfs4_wait_for_completion_rpc_task(task); 6131 if (status == 0) 6132 status = task->tk_status; 6133 if (status == 0) 6134 lseg = pnfs_layout_process(lgp); 6135 rpc_put_task(task); 6136 dprintk("<-- %s status=%d\n", __func__, status); 6137 if (status) 6138 return ERR_PTR(status); 6139 return lseg; 6140 } 6141 6142 static void 6143 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 6144 { 6145 struct nfs4_layoutreturn *lrp = calldata; 6146 6147 dprintk("--> %s\n", __func__); 6148 nfs41_setup_sequence(lrp->clp->cl_session, 6149 &lrp->args.seq_args, 6150 &lrp->res.seq_res, 6151 task); 6152 } 6153 6154 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 6155 { 6156 struct nfs4_layoutreturn *lrp = calldata; 6157 struct nfs_server *server; 6158 6159 dprintk("--> %s\n", __func__); 6160 6161 if (!nfs41_sequence_done(task, &lrp->res.seq_res)) 6162 return; 6163 6164 server = NFS_SERVER(lrp->args.inode); 6165 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { 6166 rpc_restart_call_prepare(task); 6167 return; 6168 } 6169 dprintk("<-- %s\n", __func__); 6170 } 6171 6172 static void nfs4_layoutreturn_release(void *calldata) 6173 { 6174 struct nfs4_layoutreturn *lrp = calldata; 6175 struct pnfs_layout_hdr *lo = lrp->args.layout; 6176 6177 dprintk("--> %s\n", __func__); 6178 spin_lock(&lo->plh_inode->i_lock); 6179 if (lrp->res.lrs_present) 6180 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); 6181 lo->plh_block_lgets--; 6182 spin_unlock(&lo->plh_inode->i_lock); 6183 pnfs_put_layout_hdr(lrp->args.layout); 6184 kfree(calldata); 6185 dprintk("<-- %s\n", __func__); 6186 } 6187 6188 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 6189 .rpc_call_prepare = nfs4_layoutreturn_prepare, 6190 .rpc_call_done = nfs4_layoutreturn_done, 6191 .rpc_release = nfs4_layoutreturn_release, 6192 }; 6193 6194 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp) 6195 { 6196 struct rpc_task *task; 6197 struct rpc_message msg = { 6198 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 6199 .rpc_argp = &lrp->args, 6200 .rpc_resp = &lrp->res, 6201 }; 6202 struct rpc_task_setup task_setup_data = { 6203 .rpc_client = lrp->clp->cl_rpcclient, 6204 .rpc_message = &msg, 6205 .callback_ops = &nfs4_layoutreturn_call_ops, 6206 .callback_data = lrp, 6207 }; 6208 int status; 6209 6210 dprintk("--> %s\n", __func__); 6211 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1); 6212 task = rpc_run_task(&task_setup_data); 6213 if (IS_ERR(task)) 6214 return PTR_ERR(task); 6215 status = task->tk_status; 6216 dprintk("<-- %s status=%d\n", __func__, status); 6217 rpc_put_task(task); 6218 return status; 6219 } 6220 6221 /* 6222 * Retrieve the list of Data Server devices from the MDS. 6223 */ 6224 static int _nfs4_getdevicelist(struct nfs_server *server, 6225 const struct nfs_fh *fh, 6226 struct pnfs_devicelist *devlist) 6227 { 6228 struct nfs4_getdevicelist_args args = { 6229 .fh = fh, 6230 .layoutclass = server->pnfs_curr_ld->id, 6231 }; 6232 struct nfs4_getdevicelist_res res = { 6233 .devlist = devlist, 6234 }; 6235 struct rpc_message msg = { 6236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST], 6237 .rpc_argp = &args, 6238 .rpc_resp = &res, 6239 }; 6240 int status; 6241 6242 dprintk("--> %s\n", __func__); 6243 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 6244 &res.seq_res, 0); 6245 dprintk("<-- %s status=%d\n", __func__, status); 6246 return status; 6247 } 6248 6249 int nfs4_proc_getdevicelist(struct nfs_server *server, 6250 const struct nfs_fh *fh, 6251 struct pnfs_devicelist *devlist) 6252 { 6253 struct nfs4_exception exception = { }; 6254 int err; 6255 6256 do { 6257 err = nfs4_handle_exception(server, 6258 _nfs4_getdevicelist(server, fh, devlist), 6259 &exception); 6260 } while (exception.retry); 6261 6262 dprintk("%s: err=%d, num_devs=%u\n", __func__, 6263 err, devlist->num_devs); 6264 6265 return err; 6266 } 6267 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist); 6268 6269 static int 6270 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev) 6271 { 6272 struct nfs4_getdeviceinfo_args args = { 6273 .pdev = pdev, 6274 }; 6275 struct nfs4_getdeviceinfo_res res = { 6276 .pdev = pdev, 6277 }; 6278 struct rpc_message msg = { 6279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 6280 .rpc_argp = &args, 6281 .rpc_resp = &res, 6282 }; 6283 int status; 6284 6285 dprintk("--> %s\n", __func__); 6286 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 6287 dprintk("<-- %s status=%d\n", __func__, status); 6288 6289 return status; 6290 } 6291 6292 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev) 6293 { 6294 struct nfs4_exception exception = { }; 6295 int err; 6296 6297 do { 6298 err = nfs4_handle_exception(server, 6299 _nfs4_proc_getdeviceinfo(server, pdev), 6300 &exception); 6301 } while (exception.retry); 6302 return err; 6303 } 6304 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 6305 6306 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 6307 { 6308 struct nfs4_layoutcommit_data *data = calldata; 6309 struct nfs_server *server = NFS_SERVER(data->args.inode); 6310 struct nfs4_session *session = nfs4_get_session(server); 6311 6312 nfs41_setup_sequence(session, 6313 &data->args.seq_args, 6314 &data->res.seq_res, 6315 task); 6316 } 6317 6318 static void 6319 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 6320 { 6321 struct nfs4_layoutcommit_data *data = calldata; 6322 struct nfs_server *server = NFS_SERVER(data->args.inode); 6323 6324 if (!nfs41_sequence_done(task, &data->res.seq_res)) 6325 return; 6326 6327 switch (task->tk_status) { /* Just ignore these failures */ 6328 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 6329 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 6330 case -NFS4ERR_BADLAYOUT: /* no layout */ 6331 case -NFS4ERR_GRACE: /* loca_recalim always false */ 6332 task->tk_status = 0; 6333 break; 6334 case 0: 6335 nfs_post_op_update_inode_force_wcc(data->args.inode, 6336 data->res.fattr); 6337 break; 6338 default: 6339 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { 6340 rpc_restart_call_prepare(task); 6341 return; 6342 } 6343 } 6344 } 6345 6346 static void nfs4_layoutcommit_release(void *calldata) 6347 { 6348 struct nfs4_layoutcommit_data *data = calldata; 6349 struct pnfs_layout_segment *lseg, *tmp; 6350 unsigned long *bitlock = &NFS_I(data->args.inode)->flags; 6351 6352 pnfs_cleanup_layoutcommit(data); 6353 /* Matched by references in pnfs_set_layoutcommit */ 6354 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) { 6355 list_del_init(&lseg->pls_lc_list); 6356 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, 6357 &lseg->pls_flags)) 6358 pnfs_put_lseg(lseg); 6359 } 6360 6361 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 6362 smp_mb__after_clear_bit(); 6363 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 6364 6365 put_rpccred(data->cred); 6366 kfree(data); 6367 } 6368 6369 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 6370 .rpc_call_prepare = nfs4_layoutcommit_prepare, 6371 .rpc_call_done = nfs4_layoutcommit_done, 6372 .rpc_release = nfs4_layoutcommit_release, 6373 }; 6374 6375 int 6376 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 6377 { 6378 struct rpc_message msg = { 6379 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 6380 .rpc_argp = &data->args, 6381 .rpc_resp = &data->res, 6382 .rpc_cred = data->cred, 6383 }; 6384 struct rpc_task_setup task_setup_data = { 6385 .task = &data->task, 6386 .rpc_client = NFS_CLIENT(data->args.inode), 6387 .rpc_message = &msg, 6388 .callback_ops = &nfs4_layoutcommit_ops, 6389 .callback_data = data, 6390 .flags = RPC_TASK_ASYNC, 6391 }; 6392 struct rpc_task *task; 6393 int status = 0; 6394 6395 dprintk("NFS: %4d initiating layoutcommit call. sync %d " 6396 "lbw: %llu inode %lu\n", 6397 data->task.tk_pid, sync, 6398 data->args.lastbytewritten, 6399 data->args.inode->i_ino); 6400 6401 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1); 6402 task = rpc_run_task(&task_setup_data); 6403 if (IS_ERR(task)) 6404 return PTR_ERR(task); 6405 if (sync == false) 6406 goto out; 6407 status = nfs4_wait_for_completion_rpc_task(task); 6408 if (status != 0) 6409 goto out; 6410 status = task->tk_status; 6411 out: 6412 dprintk("%s: status %d\n", __func__, status); 6413 rpc_put_task(task); 6414 return status; 6415 } 6416 6417 static int 6418 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 6419 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 6420 { 6421 struct nfs41_secinfo_no_name_args args = { 6422 .style = SECINFO_STYLE_CURRENT_FH, 6423 }; 6424 struct nfs4_secinfo_res res = { 6425 .flavors = flavors, 6426 }; 6427 struct rpc_message msg = { 6428 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 6429 .rpc_argp = &args, 6430 .rpc_resp = &res, 6431 }; 6432 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 6433 } 6434 6435 static int 6436 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 6437 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 6438 { 6439 struct nfs4_exception exception = { }; 6440 int err; 6441 do { 6442 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 6443 switch (err) { 6444 case 0: 6445 case -NFS4ERR_WRONGSEC: 6446 case -NFS4ERR_NOTSUPP: 6447 goto out; 6448 default: 6449 err = nfs4_handle_exception(server, err, &exception); 6450 } 6451 } while (exception.retry); 6452 out: 6453 return err; 6454 } 6455 6456 static int 6457 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 6458 struct nfs_fsinfo *info) 6459 { 6460 int err; 6461 struct page *page; 6462 rpc_authflavor_t flavor; 6463 struct nfs4_secinfo_flavors *flavors; 6464 6465 page = alloc_page(GFP_KERNEL); 6466 if (!page) { 6467 err = -ENOMEM; 6468 goto out; 6469 } 6470 6471 flavors = page_address(page); 6472 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 6473 6474 /* 6475 * Fall back on "guess and check" method if 6476 * the server doesn't support SECINFO_NO_NAME 6477 */ 6478 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) { 6479 err = nfs4_find_root_sec(server, fhandle, info); 6480 goto out_freepage; 6481 } 6482 if (err) 6483 goto out_freepage; 6484 6485 flavor = nfs_find_best_sec(flavors); 6486 if (err == 0) 6487 err = nfs4_lookup_root_sec(server, fhandle, info, flavor); 6488 6489 out_freepage: 6490 put_page(page); 6491 if (err == -EACCES) 6492 return -EPERM; 6493 out: 6494 return err; 6495 } 6496 6497 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6498 { 6499 int status; 6500 struct nfs41_test_stateid_args args = { 6501 .stateid = stateid, 6502 }; 6503 struct nfs41_test_stateid_res res; 6504 struct rpc_message msg = { 6505 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 6506 .rpc_argp = &args, 6507 .rpc_resp = &res, 6508 }; 6509 6510 dprintk("NFS call test_stateid %p\n", stateid); 6511 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0); 6512 nfs4_set_sequence_privileged(&args.seq_args); 6513 status = nfs4_call_sync_sequence(server->client, server, &msg, 6514 &args.seq_args, &res.seq_res); 6515 if (status != NFS_OK) { 6516 dprintk("NFS reply test_stateid: failed, %d\n", status); 6517 return status; 6518 } 6519 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 6520 return -res.status; 6521 } 6522 6523 /** 6524 * nfs41_test_stateid - perform a TEST_STATEID operation 6525 * 6526 * @server: server / transport on which to perform the operation 6527 * @stateid: state ID to test 6528 * 6529 * Returns NFS_OK if the server recognizes that "stateid" is valid. 6530 * Otherwise a negative NFS4ERR value is returned if the operation 6531 * failed or the state ID is not currently valid. 6532 */ 6533 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6534 { 6535 struct nfs4_exception exception = { }; 6536 int err; 6537 do { 6538 err = _nfs41_test_stateid(server, stateid); 6539 if (err != -NFS4ERR_DELAY) 6540 break; 6541 nfs4_handle_exception(server, err, &exception); 6542 } while (exception.retry); 6543 return err; 6544 } 6545 6546 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6547 { 6548 struct nfs41_free_stateid_args args = { 6549 .stateid = stateid, 6550 }; 6551 struct nfs41_free_stateid_res res; 6552 struct rpc_message msg = { 6553 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 6554 .rpc_argp = &args, 6555 .rpc_resp = &res, 6556 }; 6557 int status; 6558 6559 dprintk("NFS call free_stateid %p\n", stateid); 6560 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0); 6561 nfs4_set_sequence_privileged(&args.seq_args); 6562 status = nfs4_call_sync_sequence(server->client, server, &msg, 6563 &args.seq_args, &res.seq_res); 6564 dprintk("NFS reply free_stateid: %d\n", status); 6565 return status; 6566 } 6567 6568 /** 6569 * nfs41_free_stateid - perform a FREE_STATEID operation 6570 * 6571 * @server: server / transport on which to perform the operation 6572 * @stateid: state ID to release 6573 * 6574 * Returns NFS_OK if the server freed "stateid". Otherwise a 6575 * negative NFS4ERR value is returned. 6576 */ 6577 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid) 6578 { 6579 struct nfs4_exception exception = { }; 6580 int err; 6581 do { 6582 err = _nfs4_free_stateid(server, stateid); 6583 if (err != -NFS4ERR_DELAY) 6584 break; 6585 nfs4_handle_exception(server, err, &exception); 6586 } while (exception.retry); 6587 return err; 6588 } 6589 6590 static bool nfs41_match_stateid(const nfs4_stateid *s1, 6591 const nfs4_stateid *s2) 6592 { 6593 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 6594 return false; 6595 6596 if (s1->seqid == s2->seqid) 6597 return true; 6598 if (s1->seqid == 0 || s2->seqid == 0) 6599 return true; 6600 6601 return false; 6602 } 6603 6604 #endif /* CONFIG_NFS_V4_1 */ 6605 6606 static bool nfs4_match_stateid(const nfs4_stateid *s1, 6607 const nfs4_stateid *s2) 6608 { 6609 return nfs4_stateid_match(s1, s2); 6610 } 6611 6612 6613 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 6614 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 6615 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 6616 .recover_open = nfs4_open_reclaim, 6617 .recover_lock = nfs4_lock_reclaim, 6618 .establish_clid = nfs4_init_clientid, 6619 .get_clid_cred = nfs4_get_setclientid_cred, 6620 .detect_trunking = nfs40_discover_server_trunking, 6621 }; 6622 6623 #if defined(CONFIG_NFS_V4_1) 6624 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 6625 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 6626 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 6627 .recover_open = nfs4_open_reclaim, 6628 .recover_lock = nfs4_lock_reclaim, 6629 .establish_clid = nfs41_init_clientid, 6630 .get_clid_cred = nfs4_get_exchange_id_cred, 6631 .reclaim_complete = nfs41_proc_reclaim_complete, 6632 .detect_trunking = nfs41_discover_server_trunking, 6633 }; 6634 #endif /* CONFIG_NFS_V4_1 */ 6635 6636 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 6637 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 6638 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 6639 .recover_open = nfs4_open_expired, 6640 .recover_lock = nfs4_lock_expired, 6641 .establish_clid = nfs4_init_clientid, 6642 .get_clid_cred = nfs4_get_setclientid_cred, 6643 }; 6644 6645 #if defined(CONFIG_NFS_V4_1) 6646 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 6647 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 6648 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 6649 .recover_open = nfs41_open_expired, 6650 .recover_lock = nfs41_lock_expired, 6651 .establish_clid = nfs41_init_clientid, 6652 .get_clid_cred = nfs4_get_exchange_id_cred, 6653 }; 6654 #endif /* CONFIG_NFS_V4_1 */ 6655 6656 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 6657 .sched_state_renewal = nfs4_proc_async_renew, 6658 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked, 6659 .renew_lease = nfs4_proc_renew, 6660 }; 6661 6662 #if defined(CONFIG_NFS_V4_1) 6663 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 6664 .sched_state_renewal = nfs41_proc_async_sequence, 6665 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked, 6666 .renew_lease = nfs4_proc_sequence, 6667 }; 6668 #endif 6669 6670 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 6671 .minor_version = 0, 6672 .call_sync = _nfs4_call_sync, 6673 .match_stateid = nfs4_match_stateid, 6674 .find_root_sec = nfs4_find_root_sec, 6675 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 6676 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 6677 .state_renewal_ops = &nfs40_state_renewal_ops, 6678 }; 6679 6680 #if defined(CONFIG_NFS_V4_1) 6681 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 6682 .minor_version = 1, 6683 .call_sync = nfs4_call_sync_sequence, 6684 .match_stateid = nfs41_match_stateid, 6685 .find_root_sec = nfs41_find_root_sec, 6686 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 6687 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 6688 .state_renewal_ops = &nfs41_state_renewal_ops, 6689 }; 6690 #endif 6691 6692 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 6693 [0] = &nfs_v4_0_minor_ops, 6694 #if defined(CONFIG_NFS_V4_1) 6695 [1] = &nfs_v4_1_minor_ops, 6696 #endif 6697 }; 6698 6699 const struct inode_operations nfs4_dir_inode_operations = { 6700 .create = nfs_create, 6701 .lookup = nfs_lookup, 6702 .atomic_open = nfs_atomic_open, 6703 .link = nfs_link, 6704 .unlink = nfs_unlink, 6705 .symlink = nfs_symlink, 6706 .mkdir = nfs_mkdir, 6707 .rmdir = nfs_rmdir, 6708 .mknod = nfs_mknod, 6709 .rename = nfs_rename, 6710 .permission = nfs_permission, 6711 .getattr = nfs_getattr, 6712 .setattr = nfs_setattr, 6713 .getxattr = generic_getxattr, 6714 .setxattr = generic_setxattr, 6715 .listxattr = generic_listxattr, 6716 .removexattr = generic_removexattr, 6717 }; 6718 6719 static const struct inode_operations nfs4_file_inode_operations = { 6720 .permission = nfs_permission, 6721 .getattr = nfs_getattr, 6722 .setattr = nfs_setattr, 6723 .getxattr = generic_getxattr, 6724 .setxattr = generic_setxattr, 6725 .listxattr = generic_listxattr, 6726 .removexattr = generic_removexattr, 6727 }; 6728 6729 const struct nfs_rpc_ops nfs_v4_clientops = { 6730 .version = 4, /* protocol version */ 6731 .dentry_ops = &nfs4_dentry_operations, 6732 .dir_inode_ops = &nfs4_dir_inode_operations, 6733 .file_inode_ops = &nfs4_file_inode_operations, 6734 .file_ops = &nfs4_file_operations, 6735 .getroot = nfs4_proc_get_root, 6736 .submount = nfs4_submount, 6737 .try_mount = nfs4_try_mount, 6738 .getattr = nfs4_proc_getattr, 6739 .setattr = nfs4_proc_setattr, 6740 .lookup = nfs4_proc_lookup, 6741 .access = nfs4_proc_access, 6742 .readlink = nfs4_proc_readlink, 6743 .create = nfs4_proc_create, 6744 .remove = nfs4_proc_remove, 6745 .unlink_setup = nfs4_proc_unlink_setup, 6746 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 6747 .unlink_done = nfs4_proc_unlink_done, 6748 .rename = nfs4_proc_rename, 6749 .rename_setup = nfs4_proc_rename_setup, 6750 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 6751 .rename_done = nfs4_proc_rename_done, 6752 .link = nfs4_proc_link, 6753 .symlink = nfs4_proc_symlink, 6754 .mkdir = nfs4_proc_mkdir, 6755 .rmdir = nfs4_proc_remove, 6756 .readdir = nfs4_proc_readdir, 6757 .mknod = nfs4_proc_mknod, 6758 .statfs = nfs4_proc_statfs, 6759 .fsinfo = nfs4_proc_fsinfo, 6760 .pathconf = nfs4_proc_pathconf, 6761 .set_capabilities = nfs4_server_capabilities, 6762 .decode_dirent = nfs4_decode_dirent, 6763 .read_setup = nfs4_proc_read_setup, 6764 .read_pageio_init = pnfs_pageio_init_read, 6765 .read_rpc_prepare = nfs4_proc_read_rpc_prepare, 6766 .read_done = nfs4_read_done, 6767 .write_setup = nfs4_proc_write_setup, 6768 .write_pageio_init = pnfs_pageio_init_write, 6769 .write_rpc_prepare = nfs4_proc_write_rpc_prepare, 6770 .write_done = nfs4_write_done, 6771 .commit_setup = nfs4_proc_commit_setup, 6772 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 6773 .commit_done = nfs4_commit_done, 6774 .lock = nfs4_proc_lock, 6775 .clear_acl_cache = nfs4_zap_acl_attr, 6776 .close_context = nfs4_close_context, 6777 .open_context = nfs4_atomic_open, 6778 .have_delegation = nfs4_have_delegation, 6779 .return_delegation = nfs4_inode_return_delegation, 6780 .alloc_client = nfs4_alloc_client, 6781 .init_client = nfs4_init_client, 6782 .free_client = nfs4_free_client, 6783 .create_server = nfs4_create_server, 6784 .clone_server = nfs_clone_server, 6785 }; 6786 6787 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 6788 .prefix = XATTR_NAME_NFSV4_ACL, 6789 .list = nfs4_xattr_list_nfs4_acl, 6790 .get = nfs4_xattr_get_nfs4_acl, 6791 .set = nfs4_xattr_set_nfs4_acl, 6792 }; 6793 6794 const struct xattr_handler *nfs4_xattr_handlers[] = { 6795 &nfs4_xattr_nfs4_acl_handler, 6796 NULL 6797 }; 6798 6799 /* 6800 * Local variables: 6801 * c-basic-offset: 8 6802 * End: 6803 */ 6804