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/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.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 "sysfs.h" 67 #include "nfs4idmap.h" 68 #include "nfs4session.h" 69 #include "fscache.h" 70 #include "nfs42.h" 71 72 #include "nfs4trace.h" 73 74 #define NFSDBG_FACILITY NFSDBG_PROC 75 76 #define NFS4_BITMASK_SZ 3 77 78 #define NFS4_POLL_RETRY_MIN (HZ/10) 79 #define NFS4_POLL_RETRY_MAX (15*HZ) 80 81 /* file attributes which can be mapped to nfs attributes */ 82 #define NFS4_VALID_ATTRS (ATTR_MODE \ 83 | ATTR_UID \ 84 | ATTR_GID \ 85 | ATTR_SIZE \ 86 | ATTR_ATIME \ 87 | ATTR_MTIME \ 88 | ATTR_CTIME \ 89 | ATTR_ATIME_SET \ 90 | ATTR_MTIME_SET) 91 92 struct nfs4_opendata; 93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 97 struct nfs_fattr *fattr, struct inode *inode); 98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 99 struct nfs_fattr *fattr, struct iattr *sattr, 100 struct nfs_open_context *ctx, struct nfs4_label *ilabel); 101 #ifdef CONFIG_NFS_V4_1 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 103 const struct cred *cred, 104 struct nfs4_slot *slot, 105 bool is_privileged); 106 static int nfs41_test_stateid(struct nfs_server *, const nfs4_stateid *, 107 const struct cred *); 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 109 const struct cred *, bool); 110 #endif 111 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 113 static inline struct nfs4_label * 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 115 struct iattr *sattr, struct nfs4_label *label) 116 { 117 int err; 118 119 if (label == NULL) 120 return NULL; 121 122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 123 return NULL; 124 125 label->lfs = 0; 126 label->pi = 0; 127 label->len = 0; 128 label->label = NULL; 129 130 err = security_dentry_init_security(dentry, sattr->ia_mode, 131 &dentry->d_name, NULL, 132 (void **)&label->label, &label->len); 133 if (err == 0) 134 return label; 135 136 return NULL; 137 } 138 static inline void 139 nfs4_label_release_security(struct nfs4_label *label) 140 { 141 if (label) 142 security_release_secctx(label->label, label->len); 143 } 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 145 { 146 if (label) 147 return server->attr_bitmask; 148 149 return server->attr_bitmask_nl; 150 } 151 #else 152 static inline struct nfs4_label * 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 154 struct iattr *sattr, struct nfs4_label *l) 155 { return NULL; } 156 static inline void 157 nfs4_label_release_security(struct nfs4_label *label) 158 { return; } 159 static inline u32 * 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 161 { return server->attr_bitmask; } 162 #endif 163 164 /* Prevent leaks of NFSv4 errors into userland */ 165 static int nfs4_map_errors(int err) 166 { 167 if (err >= -1000) 168 return err; 169 switch (err) { 170 case -NFS4ERR_RESOURCE: 171 case -NFS4ERR_LAYOUTTRYLATER: 172 case -NFS4ERR_RECALLCONFLICT: 173 case -NFS4ERR_RETURNCONFLICT: 174 return -EREMOTEIO; 175 case -NFS4ERR_WRONGSEC: 176 case -NFS4ERR_WRONG_CRED: 177 return -EPERM; 178 case -NFS4ERR_BADOWNER: 179 case -NFS4ERR_BADNAME: 180 return -EINVAL; 181 case -NFS4ERR_SHARE_DENIED: 182 return -EACCES; 183 case -NFS4ERR_MINOR_VERS_MISMATCH: 184 return -EPROTONOSUPPORT; 185 case -NFS4ERR_FILE_OPEN: 186 return -EBUSY; 187 case -NFS4ERR_NOT_SAME: 188 return -ENOTSYNC; 189 default: 190 dprintk("%s could not handle NFSv4 error %d\n", 191 __func__, -err); 192 break; 193 } 194 return -EIO; 195 } 196 197 /* 198 * This is our standard bitmap for GETATTR requests. 199 */ 200 const u32 nfs4_fattr_bitmap[3] = { 201 FATTR4_WORD0_TYPE 202 | FATTR4_WORD0_CHANGE 203 | FATTR4_WORD0_SIZE 204 | FATTR4_WORD0_FSID 205 | FATTR4_WORD0_FILEID, 206 FATTR4_WORD1_MODE 207 | FATTR4_WORD1_NUMLINKS 208 | FATTR4_WORD1_OWNER 209 | FATTR4_WORD1_OWNER_GROUP 210 | FATTR4_WORD1_RAWDEV 211 | FATTR4_WORD1_SPACE_USED 212 | FATTR4_WORD1_TIME_ACCESS 213 | FATTR4_WORD1_TIME_METADATA 214 | FATTR4_WORD1_TIME_MODIFY 215 | FATTR4_WORD1_MOUNTED_ON_FILEID, 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 217 FATTR4_WORD2_SECURITY_LABEL 218 #endif 219 }; 220 221 static const u32 nfs4_pnfs_open_bitmap[3] = { 222 FATTR4_WORD0_TYPE 223 | FATTR4_WORD0_CHANGE 224 | FATTR4_WORD0_SIZE 225 | FATTR4_WORD0_FSID 226 | FATTR4_WORD0_FILEID, 227 FATTR4_WORD1_MODE 228 | FATTR4_WORD1_NUMLINKS 229 | FATTR4_WORD1_OWNER 230 | FATTR4_WORD1_OWNER_GROUP 231 | FATTR4_WORD1_RAWDEV 232 | FATTR4_WORD1_SPACE_USED 233 | FATTR4_WORD1_TIME_ACCESS 234 | FATTR4_WORD1_TIME_METADATA 235 | FATTR4_WORD1_TIME_MODIFY, 236 FATTR4_WORD2_MDSTHRESHOLD 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 238 | FATTR4_WORD2_SECURITY_LABEL 239 #endif 240 }; 241 242 static const u32 nfs4_open_noattr_bitmap[3] = { 243 FATTR4_WORD0_TYPE 244 | FATTR4_WORD0_FILEID, 245 }; 246 247 const u32 nfs4_statfs_bitmap[3] = { 248 FATTR4_WORD0_FILES_AVAIL 249 | FATTR4_WORD0_FILES_FREE 250 | FATTR4_WORD0_FILES_TOTAL, 251 FATTR4_WORD1_SPACE_AVAIL 252 | FATTR4_WORD1_SPACE_FREE 253 | FATTR4_WORD1_SPACE_TOTAL 254 }; 255 256 const u32 nfs4_pathconf_bitmap[3] = { 257 FATTR4_WORD0_MAXLINK 258 | FATTR4_WORD0_MAXNAME, 259 0 260 }; 261 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 263 | FATTR4_WORD0_MAXREAD 264 | FATTR4_WORD0_MAXWRITE 265 | FATTR4_WORD0_LEASE_TIME, 266 FATTR4_WORD1_TIME_DELTA 267 | FATTR4_WORD1_FS_LAYOUT_TYPES, 268 FATTR4_WORD2_LAYOUT_BLKSIZE 269 | FATTR4_WORD2_CLONE_BLKSIZE 270 | FATTR4_WORD2_CHANGE_ATTR_TYPE 271 | FATTR4_WORD2_XATTR_SUPPORT 272 }; 273 274 const u32 nfs4_fs_locations_bitmap[3] = { 275 FATTR4_WORD0_CHANGE 276 | FATTR4_WORD0_SIZE 277 | FATTR4_WORD0_FSID 278 | FATTR4_WORD0_FILEID 279 | FATTR4_WORD0_FS_LOCATIONS, 280 FATTR4_WORD1_OWNER 281 | FATTR4_WORD1_OWNER_GROUP 282 | FATTR4_WORD1_RAWDEV 283 | FATTR4_WORD1_SPACE_USED 284 | FATTR4_WORD1_TIME_ACCESS 285 | FATTR4_WORD1_TIME_METADATA 286 | FATTR4_WORD1_TIME_MODIFY 287 | FATTR4_WORD1_MOUNTED_ON_FILEID, 288 }; 289 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 291 struct inode *inode, unsigned long flags) 292 { 293 unsigned long cache_validity; 294 295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 296 if (!inode || !nfs_have_read_or_write_delegation(inode)) 297 return; 298 299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 300 301 /* Remove the attributes over which we have full control */ 302 dst[1] &= ~FATTR4_WORD1_RAWDEV; 303 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 304 dst[0] &= ~FATTR4_WORD0_SIZE; 305 306 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 307 dst[0] &= ~FATTR4_WORD0_CHANGE; 308 309 if (!(cache_validity & NFS_INO_INVALID_MODE)) 310 dst[1] &= ~FATTR4_WORD1_MODE; 311 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 313 314 if (nfs_have_delegated_mtime(inode)) { 315 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 316 dst[1] &= ~FATTR4_WORD1_TIME_ACCESS; 317 if (!(cache_validity & NFS_INO_INVALID_MTIME)) 318 dst[1] &= ~FATTR4_WORD1_TIME_MODIFY; 319 if (!(cache_validity & NFS_INO_INVALID_CTIME)) 320 dst[1] &= ~FATTR4_WORD1_TIME_METADATA; 321 } else if (nfs_have_delegated_atime(inode)) { 322 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 323 dst[1] &= ~FATTR4_WORD1_TIME_ACCESS; 324 } 325 } 326 327 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 328 struct nfs4_readdir_arg *readdir) 329 { 330 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 331 __be32 *start, *p; 332 333 if (cookie > 2) { 334 readdir->cookie = cookie; 335 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 336 return; 337 } 338 339 readdir->cookie = 0; 340 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 341 if (cookie == 2) 342 return; 343 344 /* 345 * NFSv4 servers do not return entries for '.' and '..' 346 * Therefore, we fake these entries here. We let '.' 347 * have cookie 0 and '..' have cookie 1. Note that 348 * when talking to the server, we always send cookie 0 349 * instead of 1 or 2. 350 */ 351 start = p = kmap_atomic(*readdir->pages); 352 353 if (cookie == 0) { 354 *p++ = xdr_one; /* next */ 355 *p++ = xdr_zero; /* cookie, first word */ 356 *p++ = xdr_one; /* cookie, second word */ 357 *p++ = xdr_one; /* entry len */ 358 memcpy(p, ".\0\0\0", 4); /* entry */ 359 p++; 360 *p++ = xdr_one; /* bitmap length */ 361 *p++ = htonl(attrs); /* bitmap */ 362 *p++ = htonl(12); /* attribute buffer length */ 363 *p++ = htonl(NF4DIR); 364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 365 } 366 367 *p++ = xdr_one; /* next */ 368 *p++ = xdr_zero; /* cookie, first word */ 369 *p++ = xdr_two; /* cookie, second word */ 370 *p++ = xdr_two; /* entry len */ 371 memcpy(p, "..\0\0", 4); /* entry */ 372 p++; 373 *p++ = xdr_one; /* bitmap length */ 374 *p++ = htonl(attrs); /* bitmap */ 375 *p++ = htonl(12); /* attribute buffer length */ 376 *p++ = htonl(NF4DIR); 377 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 378 379 readdir->pgbase = (char *)p - (char *)start; 380 readdir->count -= readdir->pgbase; 381 kunmap_atomic(start); 382 } 383 384 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 385 { 386 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 387 fattr->pre_change_attr = version; 388 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 389 } 390 } 391 392 static void nfs4_test_and_free_stateid(struct nfs_server *server, 393 nfs4_stateid *stateid, 394 const struct cred *cred) 395 { 396 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 397 398 ops->test_and_free_expired(server, stateid, cred); 399 } 400 401 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 402 nfs4_stateid *stateid, 403 const struct cred *cred) 404 { 405 stateid->type = NFS4_REVOKED_STATEID_TYPE; 406 nfs4_test_and_free_stateid(server, stateid, cred); 407 } 408 409 static void nfs4_free_revoked_stateid(struct nfs_server *server, 410 const nfs4_stateid *stateid, 411 const struct cred *cred) 412 { 413 nfs4_stateid tmp; 414 415 nfs4_stateid_copy(&tmp, stateid); 416 __nfs4_free_revoked_stateid(server, &tmp, cred); 417 } 418 419 static long nfs4_update_delay(long *timeout) 420 { 421 long ret; 422 if (!timeout) 423 return NFS4_POLL_RETRY_MAX; 424 if (*timeout <= 0) 425 *timeout = NFS4_POLL_RETRY_MIN; 426 if (*timeout > NFS4_POLL_RETRY_MAX) 427 *timeout = NFS4_POLL_RETRY_MAX; 428 ret = *timeout; 429 *timeout <<= 1; 430 return ret; 431 } 432 433 static int nfs4_delay_killable(long *timeout) 434 { 435 might_sleep(); 436 437 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 438 schedule_timeout(nfs4_update_delay(timeout)); 439 if (!__fatal_signal_pending(current)) 440 return 0; 441 return -EINTR; 442 } 443 444 static int nfs4_delay_interruptible(long *timeout) 445 { 446 might_sleep(); 447 448 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 449 schedule_timeout(nfs4_update_delay(timeout)); 450 if (!signal_pending(current)) 451 return 0; 452 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 453 } 454 455 static int nfs4_delay(long *timeout, bool interruptible) 456 { 457 if (interruptible) 458 return nfs4_delay_interruptible(timeout); 459 return nfs4_delay_killable(timeout); 460 } 461 462 static const nfs4_stateid * 463 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 464 { 465 if (!stateid) 466 return NULL; 467 switch (stateid->type) { 468 case NFS4_OPEN_STATEID_TYPE: 469 case NFS4_LOCK_STATEID_TYPE: 470 case NFS4_DELEGATION_STATEID_TYPE: 471 return stateid; 472 default: 473 break; 474 } 475 return NULL; 476 } 477 478 /* This is the error handling routine for processes that are allowed 479 * to sleep. 480 */ 481 static int nfs4_do_handle_exception(struct nfs_server *server, 482 int errorcode, struct nfs4_exception *exception) 483 { 484 struct nfs_client *clp = server->nfs_client; 485 struct nfs4_state *state = exception->state; 486 const nfs4_stateid *stateid; 487 struct inode *inode = exception->inode; 488 int ret = errorcode; 489 490 exception->delay = 0; 491 exception->recovering = 0; 492 exception->retry = 0; 493 494 stateid = nfs4_recoverable_stateid(exception->stateid); 495 if (stateid == NULL && state != NULL) 496 stateid = nfs4_recoverable_stateid(&state->stateid); 497 498 switch(errorcode) { 499 case 0: 500 return 0; 501 case -NFS4ERR_BADHANDLE: 502 case -ESTALE: 503 if (inode != NULL && S_ISREG(inode->i_mode)) 504 pnfs_destroy_layout(NFS_I(inode)); 505 break; 506 case -NFS4ERR_DELEG_REVOKED: 507 case -NFS4ERR_ADMIN_REVOKED: 508 case -NFS4ERR_EXPIRED: 509 case -NFS4ERR_BAD_STATEID: 510 case -NFS4ERR_PARTNER_NO_AUTH: 511 if (inode != NULL && stateid != NULL) { 512 nfs_inode_find_state_and_recover(inode, 513 stateid); 514 goto wait_on_recovery; 515 } 516 fallthrough; 517 case -NFS4ERR_OPENMODE: 518 if (inode) { 519 int err; 520 521 err = nfs_async_inode_return_delegation(inode, 522 stateid); 523 if (err == 0) 524 goto wait_on_recovery; 525 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 526 exception->retry = 1; 527 break; 528 } 529 } 530 if (state == NULL) 531 break; 532 ret = nfs4_schedule_stateid_recovery(server, state); 533 if (ret < 0) 534 break; 535 goto wait_on_recovery; 536 case -NFS4ERR_STALE_STATEID: 537 case -NFS4ERR_STALE_CLIENTID: 538 nfs4_schedule_lease_recovery(clp); 539 goto wait_on_recovery; 540 case -NFS4ERR_MOVED: 541 ret = nfs4_schedule_migration_recovery(server); 542 if (ret < 0) 543 break; 544 goto wait_on_recovery; 545 case -NFS4ERR_LEASE_MOVED: 546 nfs4_schedule_lease_moved_recovery(clp); 547 goto wait_on_recovery; 548 #if defined(CONFIG_NFS_V4_1) 549 case -NFS4ERR_BADSESSION: 550 case -NFS4ERR_BADSLOT: 551 case -NFS4ERR_BAD_HIGH_SLOT: 552 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 553 case -NFS4ERR_DEADSESSION: 554 case -NFS4ERR_SEQ_FALSE_RETRY: 555 case -NFS4ERR_SEQ_MISORDERED: 556 /* Handled in nfs41_sequence_process() */ 557 goto wait_on_recovery; 558 #endif /* defined(CONFIG_NFS_V4_1) */ 559 case -NFS4ERR_FILE_OPEN: 560 if (exception->timeout > HZ) { 561 /* We have retried a decent amount, time to 562 * fail 563 */ 564 ret = -EBUSY; 565 break; 566 } 567 fallthrough; 568 case -NFS4ERR_DELAY: 569 nfs_inc_server_stats(server, NFSIOS_DELAY); 570 fallthrough; 571 case -NFS4ERR_GRACE: 572 case -NFS4ERR_LAYOUTTRYLATER: 573 case -NFS4ERR_RECALLCONFLICT: 574 case -NFS4ERR_RETURNCONFLICT: 575 exception->delay = 1; 576 return 0; 577 578 case -NFS4ERR_RETRY_UNCACHED_REP: 579 case -NFS4ERR_OLD_STATEID: 580 exception->retry = 1; 581 break; 582 case -NFS4ERR_BADOWNER: 583 /* The following works around a Linux server bug! */ 584 case -NFS4ERR_BADNAME: 585 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 586 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 587 exception->retry = 1; 588 printk(KERN_WARNING "NFS: v4 server %s " 589 "does not accept raw " 590 "uid/gids. " 591 "Reenabling the idmapper.\n", 592 server->nfs_client->cl_hostname); 593 } 594 } 595 /* We failed to handle the error */ 596 return nfs4_map_errors(ret); 597 wait_on_recovery: 598 exception->recovering = 1; 599 return 0; 600 } 601 602 /* 603 * Track the number of NFS4ERR_DELAY related retransmissions and return 604 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit 605 * set by 'nfs_delay_retrans'. 606 */ 607 static int nfs4_exception_should_retrans(const struct nfs_server *server, 608 struct nfs4_exception *exception) 609 { 610 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) { 611 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans) 612 return -EAGAIN; 613 } 614 return 0; 615 } 616 617 /* This is the error handling routine for processes that are allowed 618 * to sleep. 619 */ 620 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 621 { 622 struct nfs_client *clp = server->nfs_client; 623 int ret; 624 625 ret = nfs4_do_handle_exception(server, errorcode, exception); 626 if (exception->delay) { 627 int ret2 = nfs4_exception_should_retrans(server, exception); 628 if (ret2 < 0) { 629 exception->retry = 0; 630 return ret2; 631 } 632 ret = nfs4_delay(&exception->timeout, 633 exception->interruptible); 634 goto out_retry; 635 } 636 if (exception->recovering) { 637 if (exception->task_is_privileged) 638 return -EDEADLOCK; 639 ret = nfs4_wait_clnt_recover(clp); 640 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 641 return -EIO; 642 goto out_retry; 643 } 644 return ret; 645 out_retry: 646 if (ret == 0) 647 exception->retry = 1; 648 return ret; 649 } 650 651 static int 652 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 653 int errorcode, struct nfs4_exception *exception) 654 { 655 struct nfs_client *clp = server->nfs_client; 656 int ret; 657 658 ret = nfs4_do_handle_exception(server, errorcode, exception); 659 if (exception->delay) { 660 int ret2 = nfs4_exception_should_retrans(server, exception); 661 if (ret2 < 0) { 662 exception->retry = 0; 663 return ret2; 664 } 665 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 666 goto out_retry; 667 } 668 if (exception->recovering) { 669 if (exception->task_is_privileged) 670 return -EDEADLOCK; 671 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 672 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 673 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 674 goto out_retry; 675 } 676 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 677 ret = -EIO; 678 return ret; 679 out_retry: 680 if (ret == 0) { 681 exception->retry = 1; 682 /* 683 * For NFS4ERR_MOVED, the client transport will need to 684 * be recomputed after migration recovery has completed. 685 */ 686 if (errorcode == -NFS4ERR_MOVED) 687 rpc_task_release_transport(task); 688 } 689 return ret; 690 } 691 692 int 693 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 694 struct nfs4_state *state, long *timeout) 695 { 696 struct nfs4_exception exception = { 697 .state = state, 698 }; 699 700 if (task->tk_status >= 0) 701 return 0; 702 if (timeout) 703 exception.timeout = *timeout; 704 task->tk_status = nfs4_async_handle_exception(task, server, 705 task->tk_status, 706 &exception); 707 if (exception.delay && timeout) 708 *timeout = exception.timeout; 709 if (exception.retry) 710 return -EAGAIN; 711 return 0; 712 } 713 714 /* 715 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 716 * or 'false' otherwise. 717 */ 718 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 719 { 720 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 721 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 722 } 723 724 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 725 { 726 spin_lock(&clp->cl_lock); 727 if (time_before(clp->cl_last_renewal,timestamp)) 728 clp->cl_last_renewal = timestamp; 729 spin_unlock(&clp->cl_lock); 730 } 731 732 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 733 { 734 struct nfs_client *clp = server->nfs_client; 735 736 if (!nfs4_has_session(clp)) 737 do_renew_lease(clp, timestamp); 738 } 739 740 struct nfs4_call_sync_data { 741 const struct nfs_server *seq_server; 742 struct nfs4_sequence_args *seq_args; 743 struct nfs4_sequence_res *seq_res; 744 }; 745 746 void nfs4_init_sequence(struct nfs4_sequence_args *args, 747 struct nfs4_sequence_res *res, int cache_reply, 748 int privileged) 749 { 750 args->sa_slot = NULL; 751 args->sa_cache_this = cache_reply; 752 args->sa_privileged = privileged; 753 754 res->sr_slot = NULL; 755 } 756 757 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 758 { 759 struct nfs4_slot *slot = res->sr_slot; 760 struct nfs4_slot_table *tbl; 761 762 tbl = slot->table; 763 spin_lock(&tbl->slot_tbl_lock); 764 if (!nfs41_wake_and_assign_slot(tbl, slot)) 765 nfs4_free_slot(tbl, slot); 766 spin_unlock(&tbl->slot_tbl_lock); 767 768 res->sr_slot = NULL; 769 } 770 771 static int nfs40_sequence_done(struct rpc_task *task, 772 struct nfs4_sequence_res *res) 773 { 774 if (res->sr_slot != NULL) 775 nfs40_sequence_free_slot(res); 776 return 1; 777 } 778 779 #if defined(CONFIG_NFS_V4_1) 780 781 static void nfs41_release_slot(struct nfs4_slot *slot) 782 { 783 struct nfs4_session *session; 784 struct nfs4_slot_table *tbl; 785 bool send_new_highest_used_slotid = false; 786 787 if (!slot) 788 return; 789 tbl = slot->table; 790 session = tbl->session; 791 792 /* Bump the slot sequence number */ 793 if (slot->seq_done) 794 slot->seq_nr++; 795 slot->seq_done = 0; 796 797 spin_lock(&tbl->slot_tbl_lock); 798 /* Be nice to the server: try to ensure that the last transmitted 799 * value for highest_user_slotid <= target_highest_slotid 800 */ 801 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 802 send_new_highest_used_slotid = true; 803 804 if (nfs41_wake_and_assign_slot(tbl, slot)) { 805 send_new_highest_used_slotid = false; 806 goto out_unlock; 807 } 808 nfs4_free_slot(tbl, slot); 809 810 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 811 send_new_highest_used_slotid = false; 812 out_unlock: 813 spin_unlock(&tbl->slot_tbl_lock); 814 if (send_new_highest_used_slotid) 815 nfs41_notify_server(session->clp); 816 if (waitqueue_active(&tbl->slot_waitq)) 817 wake_up_all(&tbl->slot_waitq); 818 } 819 820 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 821 { 822 nfs41_release_slot(res->sr_slot); 823 res->sr_slot = NULL; 824 } 825 826 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 827 u32 seqnr) 828 { 829 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 830 slot->seq_nr_highest_sent = seqnr; 831 } 832 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 833 { 834 nfs4_slot_sequence_record_sent(slot, seqnr); 835 slot->seq_nr_last_acked = seqnr; 836 } 837 838 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 839 struct nfs4_slot *slot) 840 { 841 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 842 if (!IS_ERR(task)) 843 rpc_put_task_async(task); 844 } 845 846 static int nfs41_sequence_process(struct rpc_task *task, 847 struct nfs4_sequence_res *res) 848 { 849 struct nfs4_session *session; 850 struct nfs4_slot *slot = res->sr_slot; 851 struct nfs_client *clp; 852 int status; 853 int ret = 1; 854 855 if (slot == NULL) 856 goto out_noaction; 857 /* don't increment the sequence number if the task wasn't sent */ 858 if (!RPC_WAS_SENT(task) || slot->seq_done) 859 goto out; 860 861 session = slot->table->session; 862 clp = session->clp; 863 864 trace_nfs4_sequence_done(session, res); 865 866 status = res->sr_status; 867 if (task->tk_status == -NFS4ERR_DEADSESSION) 868 status = -NFS4ERR_DEADSESSION; 869 870 /* Check the SEQUENCE operation status */ 871 switch (status) { 872 case 0: 873 /* Mark this sequence number as having been acked */ 874 nfs4_slot_sequence_acked(slot, slot->seq_nr); 875 /* Update the slot's sequence and clientid lease timer */ 876 slot->seq_done = 1; 877 do_renew_lease(clp, res->sr_timestamp); 878 /* Check sequence flags */ 879 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 880 !!slot->privileged); 881 nfs41_update_target_slotid(slot->table, slot, res); 882 break; 883 case 1: 884 /* 885 * sr_status remains 1 if an RPC level error occurred. 886 * The server may or may not have processed the sequence 887 * operation.. 888 */ 889 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 890 slot->seq_done = 1; 891 goto out; 892 case -NFS4ERR_DELAY: 893 /* The server detected a resend of the RPC call and 894 * returned NFS4ERR_DELAY as per Section 2.10.6.2 895 * of RFC5661. 896 */ 897 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 898 __func__, 899 slot->slot_nr, 900 slot->seq_nr); 901 goto out_retry; 902 case -NFS4ERR_RETRY_UNCACHED_REP: 903 case -NFS4ERR_SEQ_FALSE_RETRY: 904 /* 905 * The server thinks we tried to replay a request. 906 * Retry the call after bumping the sequence ID. 907 */ 908 nfs4_slot_sequence_acked(slot, slot->seq_nr); 909 goto retry_new_seq; 910 case -NFS4ERR_BADSLOT: 911 /* 912 * The slot id we used was probably retired. Try again 913 * using a different slot id. 914 */ 915 if (slot->slot_nr < slot->table->target_highest_slotid) 916 goto session_recover; 917 goto retry_nowait; 918 case -NFS4ERR_SEQ_MISORDERED: 919 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 920 /* 921 * Were one or more calls using this slot interrupted? 922 * If the server never received the request, then our 923 * transmitted slot sequence number may be too high. However, 924 * if the server did receive the request then it might 925 * accidentally give us a reply with a mismatched operation. 926 * We can sort this out by sending a lone sequence operation 927 * to the server on the same slot. 928 */ 929 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 930 slot->seq_nr--; 931 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 932 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 933 res->sr_slot = NULL; 934 } 935 goto retry_nowait; 936 } 937 /* 938 * RFC5661: 939 * A retry might be sent while the original request is 940 * still in progress on the replier. The replier SHOULD 941 * deal with the issue by returning NFS4ERR_DELAY as the 942 * reply to SEQUENCE or CB_SEQUENCE operation, but 943 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 944 * 945 * Restart the search after a delay. 946 */ 947 slot->seq_nr = slot->seq_nr_highest_sent; 948 goto out_retry; 949 case -NFS4ERR_BADSESSION: 950 case -NFS4ERR_DEADSESSION: 951 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 952 goto session_recover; 953 default: 954 /* Just update the slot sequence no. */ 955 slot->seq_done = 1; 956 } 957 out: 958 /* The session may be reset by one of the error handlers. */ 959 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 960 out_noaction: 961 return ret; 962 session_recover: 963 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state); 964 nfs4_schedule_session_recovery(session, status); 965 dprintk("%s ERROR: %d Reset session\n", __func__, status); 966 nfs41_sequence_free_slot(res); 967 goto out; 968 retry_new_seq: 969 ++slot->seq_nr; 970 retry_nowait: 971 if (rpc_restart_call_prepare(task)) { 972 nfs41_sequence_free_slot(res); 973 task->tk_status = 0; 974 ret = 0; 975 } 976 goto out; 977 out_retry: 978 if (!rpc_restart_call(task)) 979 goto out; 980 rpc_delay(task, NFS4_POLL_RETRY_MAX); 981 return 0; 982 } 983 984 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 985 { 986 if (!nfs41_sequence_process(task, res)) 987 return 0; 988 if (res->sr_slot != NULL) 989 nfs41_sequence_free_slot(res); 990 return 1; 991 992 } 993 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 994 995 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 996 { 997 if (res->sr_slot == NULL) 998 return 1; 999 if (res->sr_slot->table->session != NULL) 1000 return nfs41_sequence_process(task, res); 1001 return nfs40_sequence_done(task, res); 1002 } 1003 1004 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1005 { 1006 if (res->sr_slot != NULL) { 1007 if (res->sr_slot->table->session != NULL) 1008 nfs41_sequence_free_slot(res); 1009 else 1010 nfs40_sequence_free_slot(res); 1011 } 1012 } 1013 1014 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 1015 { 1016 if (res->sr_slot == NULL) 1017 return 1; 1018 if (!res->sr_slot->table->session) 1019 return nfs40_sequence_done(task, res); 1020 return nfs41_sequence_done(task, res); 1021 } 1022 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1023 1024 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 1025 { 1026 struct nfs4_call_sync_data *data = calldata; 1027 1028 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 1029 1030 nfs4_setup_sequence(data->seq_server->nfs_client, 1031 data->seq_args, data->seq_res, task); 1032 } 1033 1034 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 1035 { 1036 struct nfs4_call_sync_data *data = calldata; 1037 1038 nfs41_sequence_done(task, data->seq_res); 1039 } 1040 1041 static const struct rpc_call_ops nfs41_call_sync_ops = { 1042 .rpc_call_prepare = nfs41_call_sync_prepare, 1043 .rpc_call_done = nfs41_call_sync_done, 1044 }; 1045 1046 #else /* !CONFIG_NFS_V4_1 */ 1047 1048 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1049 { 1050 return nfs40_sequence_done(task, res); 1051 } 1052 1053 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1054 { 1055 if (res->sr_slot != NULL) 1056 nfs40_sequence_free_slot(res); 1057 } 1058 1059 int nfs4_sequence_done(struct rpc_task *task, 1060 struct nfs4_sequence_res *res) 1061 { 1062 return nfs40_sequence_done(task, res); 1063 } 1064 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1065 1066 #endif /* !CONFIG_NFS_V4_1 */ 1067 1068 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1069 { 1070 res->sr_timestamp = jiffies; 1071 res->sr_status_flags = 0; 1072 res->sr_status = 1; 1073 } 1074 1075 static 1076 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1077 struct nfs4_sequence_res *res, 1078 struct nfs4_slot *slot) 1079 { 1080 if (!slot) 1081 return; 1082 slot->privileged = args->sa_privileged ? 1 : 0; 1083 args->sa_slot = slot; 1084 1085 res->sr_slot = slot; 1086 } 1087 1088 int nfs4_setup_sequence(struct nfs_client *client, 1089 struct nfs4_sequence_args *args, 1090 struct nfs4_sequence_res *res, 1091 struct rpc_task *task) 1092 { 1093 struct nfs4_session *session = nfs4_get_session(client); 1094 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1095 struct nfs4_slot *slot; 1096 1097 /* slot already allocated? */ 1098 if (res->sr_slot != NULL) 1099 goto out_start; 1100 1101 if (session) 1102 tbl = &session->fc_slot_table; 1103 1104 spin_lock(&tbl->slot_tbl_lock); 1105 /* The state manager will wait until the slot table is empty */ 1106 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1107 goto out_sleep; 1108 1109 slot = nfs4_alloc_slot(tbl); 1110 if (IS_ERR(slot)) { 1111 if (slot == ERR_PTR(-ENOMEM)) 1112 goto out_sleep_timeout; 1113 goto out_sleep; 1114 } 1115 spin_unlock(&tbl->slot_tbl_lock); 1116 1117 nfs4_sequence_attach_slot(args, res, slot); 1118 1119 trace_nfs4_setup_sequence(session, args); 1120 out_start: 1121 nfs41_sequence_res_init(res); 1122 rpc_call_start(task); 1123 return 0; 1124 out_sleep_timeout: 1125 /* Try again in 1/4 second */ 1126 if (args->sa_privileged) 1127 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1128 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1129 else 1130 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1131 NULL, jiffies + (HZ >> 2)); 1132 spin_unlock(&tbl->slot_tbl_lock); 1133 return -EAGAIN; 1134 out_sleep: 1135 if (args->sa_privileged) 1136 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1137 RPC_PRIORITY_PRIVILEGED); 1138 else 1139 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1140 spin_unlock(&tbl->slot_tbl_lock); 1141 return -EAGAIN; 1142 } 1143 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1144 1145 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1146 { 1147 struct nfs4_call_sync_data *data = calldata; 1148 nfs4_setup_sequence(data->seq_server->nfs_client, 1149 data->seq_args, data->seq_res, task); 1150 } 1151 1152 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1153 { 1154 struct nfs4_call_sync_data *data = calldata; 1155 nfs4_sequence_done(task, data->seq_res); 1156 } 1157 1158 static const struct rpc_call_ops nfs40_call_sync_ops = { 1159 .rpc_call_prepare = nfs40_call_sync_prepare, 1160 .rpc_call_done = nfs40_call_sync_done, 1161 }; 1162 1163 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1164 { 1165 int ret; 1166 struct rpc_task *task; 1167 1168 task = rpc_run_task(task_setup); 1169 if (IS_ERR(task)) 1170 return PTR_ERR(task); 1171 1172 ret = task->tk_status; 1173 rpc_put_task(task); 1174 return ret; 1175 } 1176 1177 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1178 struct nfs_server *server, 1179 struct rpc_message *msg, 1180 struct nfs4_sequence_args *args, 1181 struct nfs4_sequence_res *res, 1182 unsigned short task_flags) 1183 { 1184 struct nfs_client *clp = server->nfs_client; 1185 struct nfs4_call_sync_data data = { 1186 .seq_server = server, 1187 .seq_args = args, 1188 .seq_res = res, 1189 }; 1190 struct rpc_task_setup task_setup = { 1191 .rpc_client = clnt, 1192 .rpc_message = msg, 1193 .callback_ops = clp->cl_mvops->call_sync_ops, 1194 .callback_data = &data, 1195 .flags = task_flags, 1196 }; 1197 1198 return nfs4_call_sync_custom(&task_setup); 1199 } 1200 1201 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1202 struct nfs_server *server, 1203 struct rpc_message *msg, 1204 struct nfs4_sequence_args *args, 1205 struct nfs4_sequence_res *res) 1206 { 1207 unsigned short task_flags = 0; 1208 1209 if (server->caps & NFS_CAP_MOVEABLE) 1210 task_flags = RPC_TASK_MOVEABLE; 1211 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1212 } 1213 1214 1215 int nfs4_call_sync(struct rpc_clnt *clnt, 1216 struct nfs_server *server, 1217 struct rpc_message *msg, 1218 struct nfs4_sequence_args *args, 1219 struct nfs4_sequence_res *res, 1220 int cache_reply) 1221 { 1222 nfs4_init_sequence(args, res, cache_reply, 0); 1223 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1224 } 1225 1226 static void 1227 nfs4_inc_nlink_locked(struct inode *inode) 1228 { 1229 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1230 NFS_INO_INVALID_CTIME | 1231 NFS_INO_INVALID_NLINK); 1232 inc_nlink(inode); 1233 } 1234 1235 static void 1236 nfs4_inc_nlink(struct inode *inode) 1237 { 1238 spin_lock(&inode->i_lock); 1239 nfs4_inc_nlink_locked(inode); 1240 spin_unlock(&inode->i_lock); 1241 } 1242 1243 static void 1244 nfs4_dec_nlink_locked(struct inode *inode) 1245 { 1246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1247 NFS_INO_INVALID_CTIME | 1248 NFS_INO_INVALID_NLINK); 1249 drop_nlink(inode); 1250 } 1251 1252 static void 1253 nfs4_update_changeattr_locked(struct inode *inode, 1254 struct nfs4_change_info *cinfo, 1255 unsigned long timestamp, unsigned long cache_validity) 1256 { 1257 struct nfs_inode *nfsi = NFS_I(inode); 1258 u64 change_attr = inode_peek_iversion_raw(inode); 1259 1260 if (!nfs_have_delegated_mtime(inode)) 1261 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1262 if (S_ISDIR(inode->i_mode)) 1263 cache_validity |= NFS_INO_INVALID_DATA; 1264 1265 switch (NFS_SERVER(inode)->change_attr_type) { 1266 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1267 if (cinfo->after == change_attr) 1268 goto out; 1269 break; 1270 default: 1271 if ((s64)(change_attr - cinfo->after) >= 0) 1272 goto out; 1273 } 1274 1275 inode_set_iversion_raw(inode, cinfo->after); 1276 if (!cinfo->atomic || cinfo->before != change_attr) { 1277 if (S_ISDIR(inode->i_mode)) 1278 nfs_force_lookup_revalidate(inode); 1279 1280 if (!nfs_have_delegated_attributes(inode)) 1281 cache_validity |= 1282 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1283 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1284 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1285 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1286 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1287 } 1288 nfsi->attrtimeo_timestamp = jiffies; 1289 nfsi->read_cache_jiffies = timestamp; 1290 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1291 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1292 out: 1293 nfs_set_cache_invalid(inode, cache_validity); 1294 } 1295 1296 void 1297 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1298 unsigned long timestamp, unsigned long cache_validity) 1299 { 1300 spin_lock(&dir->i_lock); 1301 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1302 spin_unlock(&dir->i_lock); 1303 } 1304 1305 struct nfs4_open_createattrs { 1306 struct nfs4_label *label; 1307 struct iattr *sattr; 1308 const __u32 verf[2]; 1309 }; 1310 1311 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1312 int err, struct nfs4_exception *exception) 1313 { 1314 if (err != -EINVAL) 1315 return false; 1316 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1317 return false; 1318 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1319 exception->retry = 1; 1320 return true; 1321 } 1322 1323 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1324 { 1325 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1326 } 1327 1328 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1329 { 1330 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1331 1332 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1333 } 1334 1335 static u32 1336 nfs4_fmode_to_share_access(fmode_t fmode) 1337 { 1338 u32 res = 0; 1339 1340 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1341 case FMODE_READ: 1342 res = NFS4_SHARE_ACCESS_READ; 1343 break; 1344 case FMODE_WRITE: 1345 res = NFS4_SHARE_ACCESS_WRITE; 1346 break; 1347 case FMODE_READ|FMODE_WRITE: 1348 res = NFS4_SHARE_ACCESS_BOTH; 1349 } 1350 return res; 1351 } 1352 1353 static u32 1354 nfs4_map_atomic_open_share(struct nfs_server *server, 1355 fmode_t fmode, int openflags) 1356 { 1357 u32 res = nfs4_fmode_to_share_access(fmode); 1358 1359 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1360 goto out; 1361 /* Want no delegation if we're using O_DIRECT */ 1362 if (openflags & O_DIRECT) { 1363 res |= NFS4_SHARE_WANT_NO_DELEG; 1364 goto out; 1365 } 1366 /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */ 1367 if (server->caps & NFS_CAP_DELEGTIME) 1368 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS; 1369 if (server->caps & NFS_CAP_OPEN_XOR) 1370 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION; 1371 out: 1372 return res; 1373 } 1374 1375 static enum open_claim_type4 1376 nfs4_map_atomic_open_claim(struct nfs_server *server, 1377 enum open_claim_type4 claim) 1378 { 1379 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1380 return claim; 1381 switch (claim) { 1382 default: 1383 return claim; 1384 case NFS4_OPEN_CLAIM_FH: 1385 return NFS4_OPEN_CLAIM_NULL; 1386 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1387 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1388 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1389 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1390 } 1391 } 1392 1393 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1394 { 1395 p->o_res.f_attr = &p->f_attr; 1396 p->o_res.seqid = p->o_arg.seqid; 1397 p->c_res.seqid = p->c_arg.seqid; 1398 p->o_res.server = p->o_arg.server; 1399 p->o_res.access_request = p->o_arg.access; 1400 nfs_fattr_init(&p->f_attr); 1401 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1402 } 1403 1404 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1405 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1406 const struct nfs4_open_createattrs *c, 1407 enum open_claim_type4 claim, 1408 gfp_t gfp_mask) 1409 { 1410 struct dentry *parent = dget_parent(dentry); 1411 struct inode *dir = d_inode(parent); 1412 struct nfs_server *server = NFS_SERVER(dir); 1413 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1414 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1415 struct nfs4_opendata *p; 1416 1417 p = kzalloc(sizeof(*p), gfp_mask); 1418 if (p == NULL) 1419 goto err; 1420 1421 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1422 if (IS_ERR(p->f_attr.label)) 1423 goto err_free_p; 1424 1425 p->a_label = nfs4_label_alloc(server, gfp_mask); 1426 if (IS_ERR(p->a_label)) 1427 goto err_free_f; 1428 1429 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1430 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1431 if (IS_ERR(p->o_arg.seqid)) 1432 goto err_free_label; 1433 nfs_sb_active(dentry->d_sb); 1434 p->dentry = dget(dentry); 1435 p->dir = parent; 1436 p->owner = sp; 1437 atomic_inc(&sp->so_count); 1438 p->o_arg.open_flags = flags; 1439 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1440 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1441 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1442 fmode, flags); 1443 if (flags & O_CREAT) { 1444 p->o_arg.umask = current_umask(); 1445 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1446 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1447 p->o_arg.u.attrs = &p->attrs; 1448 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1449 1450 memcpy(p->o_arg.u.verifier.data, c->verf, 1451 sizeof(p->o_arg.u.verifier.data)); 1452 } 1453 } 1454 /* ask server to check for all possible rights as results 1455 * are cached */ 1456 switch (p->o_arg.claim) { 1457 default: 1458 break; 1459 case NFS4_OPEN_CLAIM_NULL: 1460 case NFS4_OPEN_CLAIM_FH: 1461 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1462 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1463 NFS4_ACCESS_EXECUTE | 1464 nfs_access_xattr_mask(server); 1465 } 1466 p->o_arg.clientid = server->nfs_client->cl_clientid; 1467 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1468 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1469 p->o_arg.name = &dentry->d_name; 1470 p->o_arg.server = server; 1471 p->o_arg.bitmask = nfs4_bitmask(server, label); 1472 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1473 switch (p->o_arg.claim) { 1474 case NFS4_OPEN_CLAIM_NULL: 1475 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1476 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1477 p->o_arg.fh = NFS_FH(dir); 1478 break; 1479 case NFS4_OPEN_CLAIM_PREVIOUS: 1480 case NFS4_OPEN_CLAIM_FH: 1481 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1482 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1483 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1484 } 1485 p->c_arg.fh = &p->o_res.fh; 1486 p->c_arg.stateid = &p->o_res.stateid; 1487 p->c_arg.seqid = p->o_arg.seqid; 1488 nfs4_init_opendata_res(p); 1489 kref_init(&p->kref); 1490 return p; 1491 1492 err_free_label: 1493 nfs4_label_free(p->a_label); 1494 err_free_f: 1495 nfs4_label_free(p->f_attr.label); 1496 err_free_p: 1497 kfree(p); 1498 err: 1499 dput(parent); 1500 return NULL; 1501 } 1502 1503 static void nfs4_opendata_free(struct kref *kref) 1504 { 1505 struct nfs4_opendata *p = container_of(kref, 1506 struct nfs4_opendata, kref); 1507 struct super_block *sb = p->dentry->d_sb; 1508 1509 nfs4_lgopen_release(p->lgp); 1510 nfs_free_seqid(p->o_arg.seqid); 1511 nfs4_sequence_free_slot(&p->o_res.seq_res); 1512 if (p->state != NULL) 1513 nfs4_put_open_state(p->state); 1514 nfs4_put_state_owner(p->owner); 1515 1516 nfs4_label_free(p->a_label); 1517 nfs4_label_free(p->f_attr.label); 1518 1519 dput(p->dir); 1520 dput(p->dentry); 1521 nfs_sb_deactive(sb); 1522 nfs_fattr_free_names(&p->f_attr); 1523 kfree(p->f_attr.mdsthreshold); 1524 kfree(p); 1525 } 1526 1527 static void nfs4_opendata_put(struct nfs4_opendata *p) 1528 { 1529 if (p != NULL) 1530 kref_put(&p->kref, nfs4_opendata_free); 1531 } 1532 1533 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1534 fmode_t fmode) 1535 { 1536 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1537 case FMODE_READ|FMODE_WRITE: 1538 return state->n_rdwr != 0; 1539 case FMODE_WRITE: 1540 return state->n_wronly != 0; 1541 case FMODE_READ: 1542 return state->n_rdonly != 0; 1543 } 1544 WARN_ON_ONCE(1); 1545 return false; 1546 } 1547 1548 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1549 int open_mode, enum open_claim_type4 claim) 1550 { 1551 int ret = 0; 1552 1553 if (open_mode & (O_EXCL|O_TRUNC)) 1554 goto out; 1555 switch (claim) { 1556 case NFS4_OPEN_CLAIM_NULL: 1557 case NFS4_OPEN_CLAIM_FH: 1558 goto out; 1559 default: 1560 break; 1561 } 1562 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1563 case FMODE_READ: 1564 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1565 && state->n_rdonly != 0; 1566 break; 1567 case FMODE_WRITE: 1568 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1569 && state->n_wronly != 0; 1570 break; 1571 case FMODE_READ|FMODE_WRITE: 1572 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1573 && state->n_rdwr != 0; 1574 } 1575 out: 1576 return ret; 1577 } 1578 1579 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1580 enum open_claim_type4 claim) 1581 { 1582 if (delegation == NULL) 1583 return 0; 1584 if ((delegation->type & fmode) != fmode) 1585 return 0; 1586 switch (claim) { 1587 case NFS4_OPEN_CLAIM_NULL: 1588 case NFS4_OPEN_CLAIM_FH: 1589 break; 1590 case NFS4_OPEN_CLAIM_PREVIOUS: 1591 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1592 break; 1593 fallthrough; 1594 default: 1595 return 0; 1596 } 1597 nfs_mark_delegation_referenced(delegation); 1598 return 1; 1599 } 1600 1601 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1602 { 1603 switch (fmode) { 1604 case FMODE_WRITE: 1605 state->n_wronly++; 1606 break; 1607 case FMODE_READ: 1608 state->n_rdonly++; 1609 break; 1610 case FMODE_READ|FMODE_WRITE: 1611 state->n_rdwr++; 1612 } 1613 nfs4_state_set_mode_locked(state, state->state | fmode); 1614 } 1615 1616 #ifdef CONFIG_NFS_V4_1 1617 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1618 { 1619 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1620 return true; 1621 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1622 return true; 1623 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1624 return true; 1625 return false; 1626 } 1627 #endif /* CONFIG_NFS_V4_1 */ 1628 1629 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1630 { 1631 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1632 wake_up_all(&state->waitq); 1633 } 1634 1635 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1636 { 1637 struct nfs_client *clp = state->owner->so_server->nfs_client; 1638 bool need_recover = false; 1639 1640 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1641 need_recover = true; 1642 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1643 need_recover = true; 1644 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1645 need_recover = true; 1646 if (need_recover) 1647 nfs4_state_mark_reclaim_nograce(clp, state); 1648 } 1649 1650 /* 1651 * Check for whether or not the caller may update the open stateid 1652 * to the value passed in by stateid. 1653 * 1654 * Note: This function relies heavily on the server implementing 1655 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1656 * correctly. 1657 * i.e. The stateid seqids have to be initialised to 1, and 1658 * are then incremented on every state transition. 1659 */ 1660 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1661 const nfs4_stateid *stateid) 1662 { 1663 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1664 /* The common case - we're updating to a new sequence number */ 1665 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1666 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1667 return true; 1668 return false; 1669 } 1670 /* The server returned a new stateid */ 1671 } 1672 /* This is the first OPEN in this generation */ 1673 if (stateid->seqid == cpu_to_be32(1)) 1674 return true; 1675 return false; 1676 } 1677 1678 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1679 { 1680 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1681 return; 1682 if (state->n_wronly) 1683 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1684 if (state->n_rdonly) 1685 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1686 if (state->n_rdwr) 1687 set_bit(NFS_O_RDWR_STATE, &state->flags); 1688 set_bit(NFS_OPEN_STATE, &state->flags); 1689 } 1690 1691 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1692 nfs4_stateid *stateid, fmode_t fmode) 1693 { 1694 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1695 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1696 case FMODE_WRITE: 1697 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1698 break; 1699 case FMODE_READ: 1700 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1701 break; 1702 case 0: 1703 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1704 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1705 clear_bit(NFS_OPEN_STATE, &state->flags); 1706 } 1707 if (stateid == NULL) 1708 return; 1709 /* Handle OPEN+OPEN_DOWNGRADE races */ 1710 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1711 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1712 nfs_resync_open_stateid_locked(state); 1713 goto out; 1714 } 1715 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1716 nfs4_stateid_copy(&state->stateid, stateid); 1717 nfs4_stateid_copy(&state->open_stateid, stateid); 1718 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1719 out: 1720 nfs_state_log_update_open_stateid(state); 1721 } 1722 1723 static void nfs_clear_open_stateid(struct nfs4_state *state, 1724 nfs4_stateid *arg_stateid, 1725 nfs4_stateid *stateid, fmode_t fmode) 1726 { 1727 write_seqlock(&state->seqlock); 1728 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1729 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1730 nfs_clear_open_stateid_locked(state, stateid, fmode); 1731 write_sequnlock(&state->seqlock); 1732 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1733 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1734 } 1735 1736 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1737 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1738 __must_hold(&state->owner->so_lock) 1739 __must_hold(&state->seqlock) 1740 __must_hold(RCU) 1741 1742 { 1743 DEFINE_WAIT(wait); 1744 int status = 0; 1745 for (;;) { 1746 1747 if (nfs_stateid_is_sequential(state, stateid)) 1748 break; 1749 1750 if (status) 1751 break; 1752 /* Rely on seqids for serialisation with NFSv4.0 */ 1753 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1754 break; 1755 1756 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1757 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1758 /* 1759 * Ensure we process the state changes in the same order 1760 * in which the server processed them by delaying the 1761 * update of the stateid until we are in sequence. 1762 */ 1763 write_sequnlock(&state->seqlock); 1764 spin_unlock(&state->owner->so_lock); 1765 rcu_read_unlock(); 1766 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1767 1768 if (!fatal_signal_pending(current)) { 1769 if (schedule_timeout(5*HZ) == 0) 1770 status = -EAGAIN; 1771 else 1772 status = 0; 1773 } else 1774 status = -EINTR; 1775 finish_wait(&state->waitq, &wait); 1776 rcu_read_lock(); 1777 spin_lock(&state->owner->so_lock); 1778 write_seqlock(&state->seqlock); 1779 } 1780 1781 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1782 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1783 nfs4_stateid_copy(freeme, &state->open_stateid); 1784 nfs_test_and_clear_all_open_stateid(state); 1785 } 1786 1787 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1788 nfs4_stateid_copy(&state->stateid, stateid); 1789 nfs4_stateid_copy(&state->open_stateid, stateid); 1790 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1791 nfs_state_log_update_open_stateid(state); 1792 } 1793 1794 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1795 const nfs4_stateid *open_stateid, 1796 fmode_t fmode, 1797 nfs4_stateid *freeme) 1798 { 1799 /* 1800 * Protect the call to nfs4_state_set_mode_locked and 1801 * serialise the stateid update 1802 */ 1803 write_seqlock(&state->seqlock); 1804 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1805 switch (fmode) { 1806 case FMODE_READ: 1807 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1808 break; 1809 case FMODE_WRITE: 1810 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1811 break; 1812 case FMODE_READ|FMODE_WRITE: 1813 set_bit(NFS_O_RDWR_STATE, &state->flags); 1814 } 1815 set_bit(NFS_OPEN_STATE, &state->flags); 1816 write_sequnlock(&state->seqlock); 1817 } 1818 1819 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1820 { 1821 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1822 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1823 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1824 clear_bit(NFS_OPEN_STATE, &state->flags); 1825 } 1826 1827 static void nfs_state_set_delegation(struct nfs4_state *state, 1828 const nfs4_stateid *deleg_stateid, 1829 fmode_t fmode) 1830 { 1831 /* 1832 * Protect the call to nfs4_state_set_mode_locked and 1833 * serialise the stateid update 1834 */ 1835 write_seqlock(&state->seqlock); 1836 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1837 set_bit(NFS_DELEGATED_STATE, &state->flags); 1838 write_sequnlock(&state->seqlock); 1839 } 1840 1841 static void nfs_state_clear_delegation(struct nfs4_state *state) 1842 { 1843 write_seqlock(&state->seqlock); 1844 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1845 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1846 write_sequnlock(&state->seqlock); 1847 } 1848 1849 int update_open_stateid(struct nfs4_state *state, 1850 const nfs4_stateid *open_stateid, 1851 const nfs4_stateid *delegation, 1852 fmode_t fmode) 1853 { 1854 struct nfs_server *server = NFS_SERVER(state->inode); 1855 struct nfs_client *clp = server->nfs_client; 1856 struct nfs_inode *nfsi = NFS_I(state->inode); 1857 struct nfs_delegation *deleg_cur; 1858 nfs4_stateid freeme = { }; 1859 int ret = 0; 1860 1861 fmode &= (FMODE_READ|FMODE_WRITE); 1862 1863 rcu_read_lock(); 1864 spin_lock(&state->owner->so_lock); 1865 if (open_stateid != NULL) { 1866 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1867 ret = 1; 1868 } 1869 1870 deleg_cur = nfs4_get_valid_delegation(state->inode); 1871 if (deleg_cur == NULL) 1872 goto no_delegation; 1873 1874 spin_lock(&deleg_cur->lock); 1875 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1876 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1877 (deleg_cur->type & fmode) != fmode) 1878 goto no_delegation_unlock; 1879 1880 if (delegation == NULL) 1881 delegation = &deleg_cur->stateid; 1882 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1883 goto no_delegation_unlock; 1884 1885 nfs_mark_delegation_referenced(deleg_cur); 1886 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1887 ret = 1; 1888 no_delegation_unlock: 1889 spin_unlock(&deleg_cur->lock); 1890 no_delegation: 1891 if (ret) 1892 update_open_stateflags(state, fmode); 1893 spin_unlock(&state->owner->so_lock); 1894 rcu_read_unlock(); 1895 1896 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1897 nfs4_schedule_state_manager(clp); 1898 if (freeme.type != 0) 1899 nfs4_test_and_free_stateid(server, &freeme, 1900 state->owner->so_cred); 1901 1902 return ret; 1903 } 1904 1905 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1906 const nfs4_stateid *stateid) 1907 { 1908 struct nfs4_state *state = lsp->ls_state; 1909 bool ret = false; 1910 1911 spin_lock(&state->state_lock); 1912 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1913 goto out_noupdate; 1914 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1915 goto out_noupdate; 1916 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1917 ret = true; 1918 out_noupdate: 1919 spin_unlock(&state->state_lock); 1920 return ret; 1921 } 1922 1923 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1924 { 1925 struct nfs_delegation *delegation; 1926 1927 fmode &= FMODE_READ|FMODE_WRITE; 1928 rcu_read_lock(); 1929 delegation = nfs4_get_valid_delegation(inode); 1930 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1931 rcu_read_unlock(); 1932 return; 1933 } 1934 rcu_read_unlock(); 1935 nfs4_inode_return_delegation(inode); 1936 } 1937 1938 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1939 { 1940 struct nfs4_state *state = opendata->state; 1941 struct nfs_delegation *delegation; 1942 int open_mode = opendata->o_arg.open_flags; 1943 fmode_t fmode = opendata->o_arg.fmode; 1944 enum open_claim_type4 claim = opendata->o_arg.claim; 1945 nfs4_stateid stateid; 1946 int ret = -EAGAIN; 1947 1948 for (;;) { 1949 spin_lock(&state->owner->so_lock); 1950 if (can_open_cached(state, fmode, open_mode, claim)) { 1951 update_open_stateflags(state, fmode); 1952 spin_unlock(&state->owner->so_lock); 1953 goto out_return_state; 1954 } 1955 spin_unlock(&state->owner->so_lock); 1956 rcu_read_lock(); 1957 delegation = nfs4_get_valid_delegation(state->inode); 1958 if (!can_open_delegated(delegation, fmode, claim)) { 1959 rcu_read_unlock(); 1960 break; 1961 } 1962 /* Save the delegation */ 1963 nfs4_stateid_copy(&stateid, &delegation->stateid); 1964 rcu_read_unlock(); 1965 nfs_release_seqid(opendata->o_arg.seqid); 1966 if (!opendata->is_recover) { 1967 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1968 if (ret != 0) 1969 goto out; 1970 } 1971 ret = -EAGAIN; 1972 1973 /* Try to update the stateid using the delegation */ 1974 if (update_open_stateid(state, NULL, &stateid, fmode)) 1975 goto out_return_state; 1976 } 1977 out: 1978 return ERR_PTR(ret); 1979 out_return_state: 1980 refcount_inc(&state->count); 1981 return state; 1982 } 1983 1984 static void 1985 nfs4_process_delegation(struct inode *inode, const struct cred *cred, 1986 enum open_claim_type4 claim, 1987 const struct nfs4_open_delegation *delegation) 1988 { 1989 switch (delegation->open_delegation_type) { 1990 case NFS4_OPEN_DELEGATE_READ: 1991 case NFS4_OPEN_DELEGATE_WRITE: 1992 case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG: 1993 case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG: 1994 break; 1995 default: 1996 return; 1997 } 1998 switch (claim) { 1999 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2000 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2001 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 2002 "returning a delegation for " 2003 "OPEN(CLAIM_DELEGATE_CUR)\n", 2004 NFS_SERVER(inode)->nfs_client->cl_hostname); 2005 break; 2006 case NFS4_OPEN_CLAIM_PREVIOUS: 2007 nfs_inode_reclaim_delegation(inode, cred, delegation->type, 2008 &delegation->stateid, 2009 delegation->pagemod_limit, 2010 delegation->open_delegation_type); 2011 break; 2012 default: 2013 nfs_inode_set_delegation(inode, cred, delegation->type, 2014 &delegation->stateid, 2015 delegation->pagemod_limit, 2016 delegation->open_delegation_type); 2017 } 2018 if (delegation->do_recall) 2019 nfs_async_inode_return_delegation(inode, &delegation->stateid); 2020 } 2021 2022 /* 2023 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 2024 * and update the nfs4_state. 2025 */ 2026 static struct nfs4_state * 2027 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 2028 { 2029 struct inode *inode = data->state->inode; 2030 struct nfs4_state *state = data->state; 2031 int ret; 2032 2033 if (!data->rpc_done) { 2034 if (data->rpc_status) 2035 return ERR_PTR(data->rpc_status); 2036 return nfs4_try_open_cached(data); 2037 } 2038 2039 ret = nfs_refresh_inode(inode, &data->f_attr); 2040 if (ret) 2041 return ERR_PTR(ret); 2042 2043 nfs4_process_delegation(state->inode, 2044 data->owner->so_cred, 2045 data->o_arg.claim, 2046 &data->o_res.delegation); 2047 2048 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) { 2049 if (!update_open_stateid(state, &data->o_res.stateid, 2050 NULL, data->o_arg.fmode)) 2051 return ERR_PTR(-EAGAIN); 2052 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) 2053 return ERR_PTR(-EAGAIN); 2054 refcount_inc(&state->count); 2055 2056 return state; 2057 } 2058 2059 static struct inode * 2060 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2061 { 2062 struct inode *inode; 2063 2064 switch (data->o_arg.claim) { 2065 case NFS4_OPEN_CLAIM_NULL: 2066 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2067 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2068 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2069 return ERR_PTR(-EAGAIN); 2070 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2071 &data->f_attr); 2072 break; 2073 default: 2074 inode = d_inode(data->dentry); 2075 ihold(inode); 2076 nfs_refresh_inode(inode, &data->f_attr); 2077 } 2078 return inode; 2079 } 2080 2081 static struct nfs4_state * 2082 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2083 { 2084 struct nfs4_state *state; 2085 struct inode *inode; 2086 2087 inode = nfs4_opendata_get_inode(data); 2088 if (IS_ERR(inode)) 2089 return ERR_CAST(inode); 2090 if (data->state != NULL && data->state->inode == inode) { 2091 state = data->state; 2092 refcount_inc(&state->count); 2093 } else 2094 state = nfs4_get_open_state(inode, data->owner); 2095 iput(inode); 2096 if (state == NULL) 2097 state = ERR_PTR(-ENOMEM); 2098 return state; 2099 } 2100 2101 static struct nfs4_state * 2102 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2103 { 2104 struct nfs4_state *state; 2105 2106 if (!data->rpc_done) { 2107 state = nfs4_try_open_cached(data); 2108 trace_nfs4_cached_open(data->state); 2109 goto out; 2110 } 2111 2112 state = nfs4_opendata_find_nfs4_state(data); 2113 if (IS_ERR(state)) 2114 goto out; 2115 2116 nfs4_process_delegation(state->inode, 2117 data->owner->so_cred, 2118 data->o_arg.claim, 2119 &data->o_res.delegation); 2120 2121 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) { 2122 if (!update_open_stateid(state, &data->o_res.stateid, 2123 NULL, data->o_arg.fmode)) { 2124 nfs4_put_open_state(state); 2125 state = ERR_PTR(-EAGAIN); 2126 } 2127 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) { 2128 nfs4_put_open_state(state); 2129 state = ERR_PTR(-EAGAIN); 2130 } 2131 out: 2132 nfs_release_seqid(data->o_arg.seqid); 2133 return state; 2134 } 2135 2136 static struct nfs4_state * 2137 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2138 { 2139 struct nfs4_state *ret; 2140 2141 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2142 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2143 else 2144 ret = _nfs4_opendata_to_nfs4_state(data); 2145 nfs4_sequence_free_slot(&data->o_res.seq_res); 2146 return ret; 2147 } 2148 2149 static struct nfs_open_context * 2150 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2151 { 2152 struct nfs_inode *nfsi = NFS_I(state->inode); 2153 struct nfs_open_context *ctx; 2154 2155 rcu_read_lock(); 2156 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2157 if (ctx->state != state) 2158 continue; 2159 if ((ctx->mode & mode) != mode) 2160 continue; 2161 if (!get_nfs_open_context(ctx)) 2162 continue; 2163 rcu_read_unlock(); 2164 return ctx; 2165 } 2166 rcu_read_unlock(); 2167 return ERR_PTR(-ENOENT); 2168 } 2169 2170 static struct nfs_open_context * 2171 nfs4_state_find_open_context(struct nfs4_state *state) 2172 { 2173 struct nfs_open_context *ctx; 2174 2175 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2176 if (!IS_ERR(ctx)) 2177 return ctx; 2178 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2179 if (!IS_ERR(ctx)) 2180 return ctx; 2181 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2182 } 2183 2184 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2185 struct nfs4_state *state, enum open_claim_type4 claim) 2186 { 2187 struct nfs4_opendata *opendata; 2188 2189 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2190 NULL, claim, GFP_NOFS); 2191 if (opendata == NULL) 2192 return ERR_PTR(-ENOMEM); 2193 opendata->state = state; 2194 refcount_inc(&state->count); 2195 return opendata; 2196 } 2197 2198 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2199 fmode_t fmode) 2200 { 2201 struct nfs4_state *newstate; 2202 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2203 int openflags = opendata->o_arg.open_flags; 2204 int ret; 2205 2206 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2207 return 0; 2208 opendata->o_arg.fmode = fmode; 2209 opendata->o_arg.share_access = 2210 nfs4_map_atomic_open_share(server, fmode, openflags); 2211 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2212 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2213 nfs4_init_opendata_res(opendata); 2214 ret = _nfs4_recover_proc_open(opendata); 2215 if (ret != 0) 2216 return ret; 2217 newstate = nfs4_opendata_to_nfs4_state(opendata); 2218 if (IS_ERR(newstate)) 2219 return PTR_ERR(newstate); 2220 if (newstate != opendata->state) 2221 ret = -ESTALE; 2222 nfs4_close_state(newstate, fmode); 2223 return ret; 2224 } 2225 2226 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2227 { 2228 int ret; 2229 2230 /* memory barrier prior to reading state->n_* */ 2231 smp_rmb(); 2232 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2233 if (ret != 0) 2234 return ret; 2235 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2236 if (ret != 0) 2237 return ret; 2238 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2239 if (ret != 0) 2240 return ret; 2241 /* 2242 * We may have performed cached opens for all three recoveries. 2243 * Check if we need to update the current stateid. 2244 */ 2245 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2246 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2247 write_seqlock(&state->seqlock); 2248 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2249 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2250 write_sequnlock(&state->seqlock); 2251 } 2252 return 0; 2253 } 2254 2255 /* 2256 * OPEN_RECLAIM: 2257 * reclaim state on the server after a reboot. 2258 */ 2259 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2260 { 2261 struct nfs_delegation *delegation; 2262 struct nfs4_opendata *opendata; 2263 u32 delegation_type = NFS4_OPEN_DELEGATE_NONE; 2264 int status; 2265 2266 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2267 NFS4_OPEN_CLAIM_PREVIOUS); 2268 if (IS_ERR(opendata)) 2269 return PTR_ERR(opendata); 2270 rcu_read_lock(); 2271 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2272 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) { 2273 switch(delegation->type) { 2274 case FMODE_READ: 2275 delegation_type = NFS4_OPEN_DELEGATE_READ; 2276 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) 2277 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG; 2278 break; 2279 case FMODE_WRITE: 2280 case FMODE_READ|FMODE_WRITE: 2281 delegation_type = NFS4_OPEN_DELEGATE_WRITE; 2282 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) 2283 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG; 2284 } 2285 } 2286 rcu_read_unlock(); 2287 opendata->o_arg.u.delegation_type = delegation_type; 2288 status = nfs4_open_recover(opendata, state); 2289 nfs4_opendata_put(opendata); 2290 return status; 2291 } 2292 2293 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2294 { 2295 struct nfs_server *server = NFS_SERVER(state->inode); 2296 struct nfs4_exception exception = { }; 2297 int err; 2298 do { 2299 err = _nfs4_do_open_reclaim(ctx, state); 2300 trace_nfs4_open_reclaim(ctx, 0, err); 2301 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2302 continue; 2303 if (err != -NFS4ERR_DELAY) 2304 break; 2305 nfs4_handle_exception(server, err, &exception); 2306 } while (exception.retry); 2307 return err; 2308 } 2309 2310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2311 { 2312 struct nfs_open_context *ctx; 2313 int ret; 2314 2315 ctx = nfs4_state_find_open_context(state); 2316 if (IS_ERR(ctx)) 2317 return -EAGAIN; 2318 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2319 nfs_state_clear_open_state_flags(state); 2320 ret = nfs4_do_open_reclaim(ctx, state); 2321 put_nfs_open_context(ctx); 2322 return ret; 2323 } 2324 2325 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err) 2326 { 2327 switch (err) { 2328 default: 2329 printk(KERN_ERR "NFS: %s: unhandled error " 2330 "%d.\n", __func__, err); 2331 fallthrough; 2332 case 0: 2333 case -ENOENT: 2334 case -EAGAIN: 2335 case -ESTALE: 2336 case -ETIMEDOUT: 2337 break; 2338 case -NFS4ERR_BADSESSION: 2339 case -NFS4ERR_BADSLOT: 2340 case -NFS4ERR_BAD_HIGH_SLOT: 2341 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2342 case -NFS4ERR_DEADSESSION: 2343 return -EAGAIN; 2344 case -NFS4ERR_STALE_CLIENTID: 2345 case -NFS4ERR_STALE_STATEID: 2346 /* Don't recall a delegation if it was lost */ 2347 nfs4_schedule_lease_recovery(server->nfs_client); 2348 return -EAGAIN; 2349 case -NFS4ERR_MOVED: 2350 nfs4_schedule_migration_recovery(server); 2351 return -EAGAIN; 2352 case -NFS4ERR_LEASE_MOVED: 2353 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2354 return -EAGAIN; 2355 case -NFS4ERR_DELEG_REVOKED: 2356 case -NFS4ERR_ADMIN_REVOKED: 2357 case -NFS4ERR_EXPIRED: 2358 case -NFS4ERR_BAD_STATEID: 2359 case -NFS4ERR_OPENMODE: 2360 nfs_inode_find_state_and_recover(state->inode, 2361 stateid); 2362 nfs4_schedule_stateid_recovery(server, state); 2363 return -EAGAIN; 2364 case -NFS4ERR_DELAY: 2365 case -NFS4ERR_GRACE: 2366 ssleep(1); 2367 return -EAGAIN; 2368 case -ENOMEM: 2369 case -NFS4ERR_DENIED: 2370 if (fl) { 2371 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2372 if (lsp) 2373 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2374 } 2375 return 0; 2376 } 2377 return err; 2378 } 2379 2380 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2381 struct nfs4_state *state, const nfs4_stateid *stateid) 2382 { 2383 struct nfs_server *server = NFS_SERVER(state->inode); 2384 struct nfs4_opendata *opendata; 2385 int err = 0; 2386 2387 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2388 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2389 if (IS_ERR(opendata)) 2390 return PTR_ERR(opendata); 2391 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2392 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2393 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2394 if (err) 2395 goto out; 2396 } 2397 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2398 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2399 if (err) 2400 goto out; 2401 } 2402 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2403 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2404 if (err) 2405 goto out; 2406 } 2407 nfs_state_clear_delegation(state); 2408 out: 2409 nfs4_opendata_put(opendata); 2410 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2411 } 2412 2413 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2414 { 2415 struct nfs4_opendata *data = calldata; 2416 2417 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2418 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2419 } 2420 2421 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2422 { 2423 struct nfs4_opendata *data = calldata; 2424 2425 nfs40_sequence_done(task, &data->c_res.seq_res); 2426 2427 data->rpc_status = task->tk_status; 2428 if (data->rpc_status == 0) { 2429 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2430 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2431 renew_lease(data->o_res.server, data->timestamp); 2432 data->rpc_done = true; 2433 } 2434 } 2435 2436 static void nfs4_open_confirm_release(void *calldata) 2437 { 2438 struct nfs4_opendata *data = calldata; 2439 struct nfs4_state *state = NULL; 2440 2441 /* If this request hasn't been cancelled, do nothing */ 2442 if (!data->cancelled) 2443 goto out_free; 2444 /* In case of error, no cleanup! */ 2445 if (!data->rpc_done) 2446 goto out_free; 2447 state = nfs4_opendata_to_nfs4_state(data); 2448 if (!IS_ERR(state)) 2449 nfs4_close_state(state, data->o_arg.fmode); 2450 out_free: 2451 nfs4_opendata_put(data); 2452 } 2453 2454 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2455 .rpc_call_prepare = nfs4_open_confirm_prepare, 2456 .rpc_call_done = nfs4_open_confirm_done, 2457 .rpc_release = nfs4_open_confirm_release, 2458 }; 2459 2460 /* 2461 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2462 */ 2463 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2464 { 2465 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2466 struct rpc_task *task; 2467 struct rpc_message msg = { 2468 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2469 .rpc_argp = &data->c_arg, 2470 .rpc_resp = &data->c_res, 2471 .rpc_cred = data->owner->so_cred, 2472 }; 2473 struct rpc_task_setup task_setup_data = { 2474 .rpc_client = server->client, 2475 .rpc_message = &msg, 2476 .callback_ops = &nfs4_open_confirm_ops, 2477 .callback_data = data, 2478 .workqueue = nfsiod_workqueue, 2479 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2480 }; 2481 int status; 2482 2483 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2484 data->is_recover); 2485 kref_get(&data->kref); 2486 data->rpc_done = false; 2487 data->rpc_status = 0; 2488 data->timestamp = jiffies; 2489 task = rpc_run_task(&task_setup_data); 2490 if (IS_ERR(task)) 2491 return PTR_ERR(task); 2492 status = rpc_wait_for_completion_task(task); 2493 if (status != 0) { 2494 data->cancelled = true; 2495 smp_wmb(); 2496 } else 2497 status = data->rpc_status; 2498 rpc_put_task(task); 2499 return status; 2500 } 2501 2502 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2503 { 2504 struct nfs4_opendata *data = calldata; 2505 struct nfs4_state_owner *sp = data->owner; 2506 struct nfs_client *clp = sp->so_server->nfs_client; 2507 enum open_claim_type4 claim = data->o_arg.claim; 2508 2509 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2510 goto out_wait; 2511 /* 2512 * Check if we still need to send an OPEN call, or if we can use 2513 * a delegation instead. 2514 */ 2515 if (data->state != NULL) { 2516 struct nfs_delegation *delegation; 2517 2518 if (can_open_cached(data->state, data->o_arg.fmode, 2519 data->o_arg.open_flags, claim)) 2520 goto out_no_action; 2521 rcu_read_lock(); 2522 delegation = nfs4_get_valid_delegation(data->state->inode); 2523 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2524 goto unlock_no_action; 2525 rcu_read_unlock(); 2526 } 2527 /* Update client id. */ 2528 data->o_arg.clientid = clp->cl_clientid; 2529 switch (claim) { 2530 default: 2531 break; 2532 case NFS4_OPEN_CLAIM_PREVIOUS: 2533 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2534 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2535 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2536 fallthrough; 2537 case NFS4_OPEN_CLAIM_FH: 2538 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2539 } 2540 data->timestamp = jiffies; 2541 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2542 &data->o_arg.seq_args, 2543 &data->o_res.seq_res, 2544 task) != 0) 2545 nfs_release_seqid(data->o_arg.seqid); 2546 2547 /* Set the create mode (note dependency on the session type) */ 2548 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2549 if (data->o_arg.open_flags & O_EXCL) { 2550 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2551 if (clp->cl_mvops->minor_version == 0) { 2552 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2553 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2554 * because ACCESS will return permission denied for 2555 * all bits until close */ 2556 data->o_res.access_request = data->o_arg.access = 0; 2557 } else if (nfs4_has_persistent_session(clp)) 2558 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2559 } 2560 return; 2561 unlock_no_action: 2562 trace_nfs4_cached_open(data->state); 2563 rcu_read_unlock(); 2564 out_no_action: 2565 task->tk_action = NULL; 2566 out_wait: 2567 nfs4_sequence_done(task, &data->o_res.seq_res); 2568 } 2569 2570 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2571 { 2572 struct nfs4_opendata *data = calldata; 2573 2574 data->rpc_status = task->tk_status; 2575 2576 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2577 return; 2578 2579 if (task->tk_status == 0) { 2580 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2581 switch (data->o_res.f_attr->mode & S_IFMT) { 2582 case S_IFREG: 2583 break; 2584 case S_IFLNK: 2585 data->rpc_status = -ELOOP; 2586 break; 2587 case S_IFDIR: 2588 data->rpc_status = -EISDIR; 2589 break; 2590 default: 2591 data->rpc_status = -ENOTDIR; 2592 } 2593 } 2594 renew_lease(data->o_res.server, data->timestamp); 2595 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2596 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2597 } 2598 data->rpc_done = true; 2599 } 2600 2601 static void nfs4_open_release(void *calldata) 2602 { 2603 struct nfs4_opendata *data = calldata; 2604 struct nfs4_state *state = NULL; 2605 2606 /* In case of error, no cleanup! */ 2607 if (data->rpc_status != 0 || !data->rpc_done) { 2608 nfs_release_seqid(data->o_arg.seqid); 2609 goto out_free; 2610 } 2611 /* If this request hasn't been cancelled, do nothing */ 2612 if (!data->cancelled) 2613 goto out_free; 2614 /* In case we need an open_confirm, no cleanup! */ 2615 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2616 goto out_free; 2617 state = nfs4_opendata_to_nfs4_state(data); 2618 if (!IS_ERR(state)) 2619 nfs4_close_state(state, data->o_arg.fmode); 2620 out_free: 2621 nfs4_opendata_put(data); 2622 } 2623 2624 static const struct rpc_call_ops nfs4_open_ops = { 2625 .rpc_call_prepare = nfs4_open_prepare, 2626 .rpc_call_done = nfs4_open_done, 2627 .rpc_release = nfs4_open_release, 2628 }; 2629 2630 static int nfs4_run_open_task(struct nfs4_opendata *data, 2631 struct nfs_open_context *ctx) 2632 { 2633 struct inode *dir = d_inode(data->dir); 2634 struct nfs_server *server = NFS_SERVER(dir); 2635 struct nfs_openargs *o_arg = &data->o_arg; 2636 struct nfs_openres *o_res = &data->o_res; 2637 struct rpc_task *task; 2638 struct rpc_message msg = { 2639 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2640 .rpc_argp = o_arg, 2641 .rpc_resp = o_res, 2642 .rpc_cred = data->owner->so_cred, 2643 }; 2644 struct rpc_task_setup task_setup_data = { 2645 .rpc_client = server->client, 2646 .rpc_message = &msg, 2647 .callback_ops = &nfs4_open_ops, 2648 .callback_data = data, 2649 .workqueue = nfsiod_workqueue, 2650 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2651 }; 2652 int status; 2653 2654 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2655 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2656 2657 kref_get(&data->kref); 2658 data->rpc_done = false; 2659 data->rpc_status = 0; 2660 data->cancelled = false; 2661 data->is_recover = false; 2662 if (!ctx) { 2663 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2664 data->is_recover = true; 2665 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2666 } else { 2667 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2668 pnfs_lgopen_prepare(data, ctx); 2669 } 2670 task = rpc_run_task(&task_setup_data); 2671 if (IS_ERR(task)) 2672 return PTR_ERR(task); 2673 status = rpc_wait_for_completion_task(task); 2674 if (status != 0) { 2675 data->cancelled = true; 2676 smp_wmb(); 2677 } else 2678 status = data->rpc_status; 2679 rpc_put_task(task); 2680 2681 return status; 2682 } 2683 2684 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2685 { 2686 struct inode *dir = d_inode(data->dir); 2687 struct nfs_openres *o_res = &data->o_res; 2688 int status; 2689 2690 status = nfs4_run_open_task(data, NULL); 2691 if (status != 0 || !data->rpc_done) 2692 return status; 2693 2694 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2695 2696 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2697 status = _nfs4_proc_open_confirm(data); 2698 2699 return status; 2700 } 2701 2702 /* 2703 * Additional permission checks in order to distinguish between an 2704 * open for read, and an open for execute. This works around the 2705 * fact that NFSv4 OPEN treats read and execute permissions as being 2706 * the same. 2707 * Note that in the non-execute case, we want to turn off permission 2708 * checking if we just created a new file (POSIX open() semantics). 2709 */ 2710 static int nfs4_opendata_access(const struct cred *cred, 2711 struct nfs4_opendata *opendata, 2712 struct nfs4_state *state, fmode_t fmode) 2713 { 2714 struct nfs_access_entry cache; 2715 u32 mask, flags; 2716 2717 /* access call failed or for some reason the server doesn't 2718 * support any access modes -- defer access call until later */ 2719 if (opendata->o_res.access_supported == 0) 2720 return 0; 2721 2722 mask = 0; 2723 if (fmode & FMODE_EXEC) { 2724 /* ONLY check for exec rights */ 2725 if (S_ISDIR(state->inode->i_mode)) 2726 mask = NFS4_ACCESS_LOOKUP; 2727 else 2728 mask = NFS4_ACCESS_EXECUTE; 2729 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2730 mask = NFS4_ACCESS_READ; 2731 2732 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2733 nfs_access_add_cache(state->inode, &cache, cred); 2734 2735 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2736 if ((mask & ~cache.mask & flags) == 0) 2737 return 0; 2738 2739 return -EACCES; 2740 } 2741 2742 /* 2743 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2744 */ 2745 static int _nfs4_proc_open(struct nfs4_opendata *data, 2746 struct nfs_open_context *ctx) 2747 { 2748 struct inode *dir = d_inode(data->dir); 2749 struct nfs_server *server = NFS_SERVER(dir); 2750 struct nfs_openargs *o_arg = &data->o_arg; 2751 struct nfs_openres *o_res = &data->o_res; 2752 int status; 2753 2754 status = nfs4_run_open_task(data, ctx); 2755 if (!data->rpc_done) 2756 return status; 2757 if (status != 0) { 2758 if (status == -NFS4ERR_BADNAME && 2759 !(o_arg->open_flags & O_CREAT)) 2760 return -ENOENT; 2761 return status; 2762 } 2763 2764 nfs_fattr_map_and_free_names(server, &data->f_attr); 2765 2766 if (o_arg->open_flags & O_CREAT) { 2767 if (o_arg->open_flags & O_EXCL) 2768 data->file_created = true; 2769 else if (o_res->cinfo.before != o_res->cinfo.after) 2770 data->file_created = true; 2771 if (data->file_created || 2772 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2773 nfs4_update_changeattr(dir, &o_res->cinfo, 2774 o_res->f_attr->time_start, 2775 NFS_INO_INVALID_DATA); 2776 } 2777 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2778 server->caps &= ~NFS_CAP_POSIX_LOCK; 2779 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2780 status = _nfs4_proc_open_confirm(data); 2781 if (status != 0) 2782 return status; 2783 } 2784 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2785 struct nfs_fh *fh = &o_res->fh; 2786 2787 nfs4_sequence_free_slot(&o_res->seq_res); 2788 if (o_arg->claim == NFS4_OPEN_CLAIM_FH) 2789 fh = NFS_FH(d_inode(data->dentry)); 2790 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL); 2791 } 2792 return 0; 2793 } 2794 2795 /* 2796 * OPEN_EXPIRED: 2797 * reclaim state on the server after a network partition. 2798 * Assumes caller holds the appropriate lock 2799 */ 2800 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2801 { 2802 struct nfs4_opendata *opendata; 2803 int ret; 2804 2805 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2806 if (IS_ERR(opendata)) 2807 return PTR_ERR(opendata); 2808 /* 2809 * We're not recovering a delegation, so ask for no delegation. 2810 * Otherwise the recovery thread could deadlock with an outstanding 2811 * delegation return. 2812 */ 2813 opendata->o_arg.open_flags = O_DIRECT; 2814 ret = nfs4_open_recover(opendata, state); 2815 if (ret == -ESTALE) 2816 d_drop(ctx->dentry); 2817 nfs4_opendata_put(opendata); 2818 return ret; 2819 } 2820 2821 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2822 { 2823 struct nfs_server *server = NFS_SERVER(state->inode); 2824 struct nfs4_exception exception = { }; 2825 int err; 2826 2827 do { 2828 err = _nfs4_open_expired(ctx, state); 2829 trace_nfs4_open_expired(ctx, 0, err); 2830 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2831 continue; 2832 switch (err) { 2833 default: 2834 goto out; 2835 case -NFS4ERR_GRACE: 2836 case -NFS4ERR_DELAY: 2837 nfs4_handle_exception(server, err, &exception); 2838 err = 0; 2839 } 2840 } while (exception.retry); 2841 out: 2842 return err; 2843 } 2844 2845 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2846 { 2847 struct nfs_open_context *ctx; 2848 int ret; 2849 2850 ctx = nfs4_state_find_open_context(state); 2851 if (IS_ERR(ctx)) 2852 return -EAGAIN; 2853 ret = nfs4_do_open_expired(ctx, state); 2854 put_nfs_open_context(ctx); 2855 return ret; 2856 } 2857 2858 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2859 const nfs4_stateid *stateid) 2860 { 2861 nfs_remove_bad_delegation(state->inode, stateid); 2862 nfs_state_clear_delegation(state); 2863 } 2864 2865 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2866 { 2867 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2868 nfs_finish_clear_delegation_stateid(state, NULL); 2869 } 2870 2871 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2872 { 2873 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2874 nfs40_clear_delegation_stateid(state); 2875 nfs_state_clear_open_state_flags(state); 2876 return nfs4_open_expired(sp, state); 2877 } 2878 2879 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2880 const nfs4_stateid *stateid, 2881 const struct cred *cred) 2882 { 2883 return -NFS4ERR_BAD_STATEID; 2884 } 2885 2886 #if defined(CONFIG_NFS_V4_1) 2887 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2888 const nfs4_stateid *stateid, 2889 const struct cred *cred) 2890 { 2891 int status; 2892 2893 switch (stateid->type) { 2894 default: 2895 break; 2896 case NFS4_INVALID_STATEID_TYPE: 2897 case NFS4_SPECIAL_STATEID_TYPE: 2898 return -NFS4ERR_BAD_STATEID; 2899 case NFS4_REVOKED_STATEID_TYPE: 2900 goto out_free; 2901 } 2902 2903 status = nfs41_test_stateid(server, stateid, cred); 2904 switch (status) { 2905 case -NFS4ERR_EXPIRED: 2906 case -NFS4ERR_ADMIN_REVOKED: 2907 case -NFS4ERR_DELEG_REVOKED: 2908 break; 2909 default: 2910 return status; 2911 } 2912 out_free: 2913 /* Ack the revoked state to the server */ 2914 nfs41_free_stateid(server, stateid, cred, true); 2915 return -NFS4ERR_EXPIRED; 2916 } 2917 2918 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2919 { 2920 struct nfs_server *server = NFS_SERVER(state->inode); 2921 nfs4_stateid stateid; 2922 struct nfs_delegation *delegation; 2923 const struct cred *cred = NULL; 2924 int status, ret = NFS_OK; 2925 2926 /* Get the delegation credential for use by test/free_stateid */ 2927 rcu_read_lock(); 2928 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2929 if (delegation == NULL) { 2930 rcu_read_unlock(); 2931 nfs_state_clear_delegation(state); 2932 return NFS_OK; 2933 } 2934 2935 spin_lock(&delegation->lock); 2936 nfs4_stateid_copy(&stateid, &delegation->stateid); 2937 2938 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2939 &delegation->flags)) { 2940 spin_unlock(&delegation->lock); 2941 rcu_read_unlock(); 2942 return NFS_OK; 2943 } 2944 2945 if (delegation->cred) 2946 cred = get_cred(delegation->cred); 2947 spin_unlock(&delegation->lock); 2948 rcu_read_unlock(); 2949 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2950 trace_nfs4_test_delegation_stateid(state, NULL, status); 2951 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2952 nfs_finish_clear_delegation_stateid(state, &stateid); 2953 else 2954 ret = status; 2955 2956 put_cred(cred); 2957 return ret; 2958 } 2959 2960 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2961 { 2962 nfs4_stateid tmp; 2963 2964 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2965 nfs4_copy_delegation_stateid(state->inode, state->state, 2966 &tmp, NULL) && 2967 nfs4_stateid_match_other(&state->stateid, &tmp)) 2968 nfs_state_set_delegation(state, &tmp, state->state); 2969 else 2970 nfs_state_clear_delegation(state); 2971 } 2972 2973 /** 2974 * nfs41_check_expired_locks - possibly free a lock stateid 2975 * 2976 * @state: NFSv4 state for an inode 2977 * 2978 * Returns NFS_OK if recovery for this stateid is now finished. 2979 * Otherwise a negative NFS4ERR value is returned. 2980 */ 2981 static int nfs41_check_expired_locks(struct nfs4_state *state) 2982 { 2983 int status, ret = NFS_OK; 2984 struct nfs4_lock_state *lsp, *prev = NULL; 2985 struct nfs_server *server = NFS_SERVER(state->inode); 2986 2987 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2988 goto out; 2989 2990 spin_lock(&state->state_lock); 2991 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2992 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2993 const struct cred *cred = lsp->ls_state->owner->so_cred; 2994 2995 refcount_inc(&lsp->ls_count); 2996 spin_unlock(&state->state_lock); 2997 2998 nfs4_put_lock_state(prev); 2999 prev = lsp; 3000 3001 status = nfs41_test_and_free_expired_stateid(server, 3002 &lsp->ls_stateid, 3003 cred); 3004 trace_nfs4_test_lock_stateid(state, lsp, status); 3005 if (status == -NFS4ERR_EXPIRED || 3006 status == -NFS4ERR_BAD_STATEID) { 3007 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 3008 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 3009 if (!recover_lost_locks) 3010 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 3011 } else if (status != NFS_OK) { 3012 ret = status; 3013 nfs4_put_lock_state(prev); 3014 goto out; 3015 } 3016 spin_lock(&state->state_lock); 3017 } 3018 } 3019 spin_unlock(&state->state_lock); 3020 nfs4_put_lock_state(prev); 3021 out: 3022 return ret; 3023 } 3024 3025 /** 3026 * nfs41_check_open_stateid - possibly free an open stateid 3027 * 3028 * @state: NFSv4 state for an inode 3029 * 3030 * Returns NFS_OK if recovery for this stateid is now finished. 3031 * Otherwise a negative NFS4ERR value is returned. 3032 */ 3033 static int nfs41_check_open_stateid(struct nfs4_state *state) 3034 { 3035 struct nfs_server *server = NFS_SERVER(state->inode); 3036 nfs4_stateid *stateid = &state->open_stateid; 3037 const struct cred *cred = state->owner->so_cred; 3038 int status; 3039 3040 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 3041 return -NFS4ERR_BAD_STATEID; 3042 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 3043 trace_nfs4_test_open_stateid(state, NULL, status); 3044 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 3045 nfs_state_clear_open_state_flags(state); 3046 stateid->type = NFS4_INVALID_STATEID_TYPE; 3047 return status; 3048 } 3049 if (nfs_open_stateid_recover_openmode(state)) 3050 return -NFS4ERR_OPENMODE; 3051 return NFS_OK; 3052 } 3053 3054 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 3055 { 3056 int status; 3057 3058 status = nfs41_check_delegation_stateid(state); 3059 if (status != NFS_OK) 3060 return status; 3061 nfs41_delegation_recover_stateid(state); 3062 3063 status = nfs41_check_expired_locks(state); 3064 if (status != NFS_OK) 3065 return status; 3066 status = nfs41_check_open_stateid(state); 3067 if (status != NFS_OK) 3068 status = nfs4_open_expired(sp, state); 3069 return status; 3070 } 3071 #endif 3072 3073 /* 3074 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 3075 * fields corresponding to attributes that were used to store the verifier. 3076 * Make sure we clobber those fields in the later setattr call 3077 */ 3078 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 3079 struct iattr *sattr, struct nfs4_label **label) 3080 { 3081 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 3082 __u32 attrset[3]; 3083 unsigned ret; 3084 unsigned i; 3085 3086 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3087 attrset[i] = opendata->o_res.attrset[i]; 3088 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3089 attrset[i] &= ~bitmask[i]; 3090 } 3091 3092 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3093 sattr->ia_valid : 0; 3094 3095 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3096 if (sattr->ia_valid & ATTR_ATIME_SET) 3097 ret |= ATTR_ATIME_SET; 3098 else 3099 ret |= ATTR_ATIME; 3100 } 3101 3102 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3103 if (sattr->ia_valid & ATTR_MTIME_SET) 3104 ret |= ATTR_MTIME_SET; 3105 else 3106 ret |= ATTR_MTIME; 3107 } 3108 3109 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3110 *label = NULL; 3111 return ret; 3112 } 3113 3114 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3115 struct nfs_open_context *ctx) 3116 { 3117 struct nfs4_state_owner *sp = opendata->owner; 3118 struct nfs_server *server = sp->so_server; 3119 struct dentry *dentry; 3120 struct nfs4_state *state; 3121 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3122 struct inode *dir = d_inode(opendata->dir); 3123 unsigned long dir_verifier; 3124 int ret; 3125 3126 dir_verifier = nfs_save_change_attribute(dir); 3127 3128 ret = _nfs4_proc_open(opendata, ctx); 3129 if (ret != 0) 3130 goto out; 3131 3132 state = _nfs4_opendata_to_nfs4_state(opendata); 3133 ret = PTR_ERR(state); 3134 if (IS_ERR(state)) 3135 goto out; 3136 ctx->state = state; 3137 if (server->caps & NFS_CAP_POSIX_LOCK) 3138 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3139 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3140 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3141 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3142 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3143 3144 dentry = opendata->dentry; 3145 if (d_really_is_negative(dentry)) { 3146 struct dentry *alias; 3147 d_drop(dentry); 3148 alias = d_exact_alias(dentry, state->inode); 3149 if (!alias) 3150 alias = d_splice_alias(igrab(state->inode), dentry); 3151 /* d_splice_alias() can't fail here - it's a non-directory */ 3152 if (alias) { 3153 dput(ctx->dentry); 3154 ctx->dentry = dentry = alias; 3155 } 3156 } 3157 3158 switch(opendata->o_arg.claim) { 3159 default: 3160 break; 3161 case NFS4_OPEN_CLAIM_NULL: 3162 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3163 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3164 if (!opendata->rpc_done) 3165 break; 3166 if (opendata->o_res.delegation.type != 0) 3167 dir_verifier = nfs_save_change_attribute(dir); 3168 nfs_set_verifier(dentry, dir_verifier); 3169 } 3170 3171 /* Parse layoutget results before we check for access */ 3172 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3173 3174 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3175 if (ret != 0) 3176 goto out; 3177 3178 if (d_inode(dentry) == state->inode) 3179 nfs_inode_attach_open_context(ctx); 3180 3181 out: 3182 if (!opendata->cancelled) { 3183 if (opendata->lgp) { 3184 nfs4_lgopen_release(opendata->lgp); 3185 opendata->lgp = NULL; 3186 } 3187 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3188 } 3189 return ret; 3190 } 3191 3192 /* 3193 * Returns a referenced nfs4_state 3194 */ 3195 static int _nfs4_do_open(struct inode *dir, 3196 struct nfs_open_context *ctx, 3197 int flags, 3198 const struct nfs4_open_createattrs *c, 3199 int *opened) 3200 { 3201 struct nfs4_state_owner *sp; 3202 struct nfs4_state *state = NULL; 3203 struct nfs_server *server = NFS_SERVER(dir); 3204 struct nfs4_opendata *opendata; 3205 struct dentry *dentry = ctx->dentry; 3206 const struct cred *cred = ctx->cred; 3207 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3208 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3209 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3210 struct iattr *sattr = c->sattr; 3211 struct nfs4_label *label = c->label; 3212 int status; 3213 3214 /* Protect against reboot recovery conflicts */ 3215 status = -ENOMEM; 3216 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3217 if (sp == NULL) { 3218 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3219 goto out_err; 3220 } 3221 status = nfs4_client_recover_expired_lease(server->nfs_client); 3222 if (status != 0) 3223 goto err_put_state_owner; 3224 if (d_really_is_positive(dentry)) 3225 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3226 status = -ENOMEM; 3227 if (d_really_is_positive(dentry)) 3228 claim = NFS4_OPEN_CLAIM_FH; 3229 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3230 c, claim, GFP_KERNEL); 3231 if (opendata == NULL) 3232 goto err_put_state_owner; 3233 3234 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3235 if (!opendata->f_attr.mdsthreshold) { 3236 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3237 if (!opendata->f_attr.mdsthreshold) 3238 goto err_opendata_put; 3239 } 3240 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3241 } 3242 if (d_really_is_positive(dentry)) 3243 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3244 3245 status = _nfs4_open_and_get_state(opendata, ctx); 3246 if (status != 0) 3247 goto err_opendata_put; 3248 state = ctx->state; 3249 3250 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3251 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3252 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3253 /* 3254 * send create attributes which was not set by open 3255 * with an extra setattr. 3256 */ 3257 if (attrs || label) { 3258 unsigned ia_old = sattr->ia_valid; 3259 3260 sattr->ia_valid = attrs; 3261 nfs_fattr_init(opendata->o_res.f_attr); 3262 status = nfs4_do_setattr(state->inode, cred, 3263 opendata->o_res.f_attr, sattr, 3264 ctx, label); 3265 if (status == 0) { 3266 nfs_setattr_update_inode(state->inode, sattr, 3267 opendata->o_res.f_attr); 3268 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3269 } 3270 sattr->ia_valid = ia_old; 3271 } 3272 } 3273 if (opened && opendata->file_created) 3274 *opened = 1; 3275 3276 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3277 *ctx_th = opendata->f_attr.mdsthreshold; 3278 opendata->f_attr.mdsthreshold = NULL; 3279 } 3280 3281 nfs4_opendata_put(opendata); 3282 nfs4_put_state_owner(sp); 3283 return 0; 3284 err_opendata_put: 3285 nfs4_opendata_put(opendata); 3286 err_put_state_owner: 3287 nfs4_put_state_owner(sp); 3288 out_err: 3289 return status; 3290 } 3291 3292 3293 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3294 struct nfs_open_context *ctx, 3295 int flags, 3296 struct iattr *sattr, 3297 struct nfs4_label *label, 3298 int *opened) 3299 { 3300 struct nfs_server *server = NFS_SERVER(dir); 3301 struct nfs4_exception exception = { 3302 .interruptible = true, 3303 }; 3304 struct nfs4_state *res; 3305 struct nfs4_open_createattrs c = { 3306 .label = label, 3307 .sattr = sattr, 3308 .verf = { 3309 [0] = (__u32)jiffies, 3310 [1] = (__u32)current->pid, 3311 }, 3312 }; 3313 int status; 3314 3315 do { 3316 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3317 res = ctx->state; 3318 trace_nfs4_open_file(ctx, flags, status); 3319 if (status == 0) 3320 break; 3321 /* NOTE: BAD_SEQID means the server and client disagree about the 3322 * book-keeping w.r.t. state-changing operations 3323 * (OPEN/CLOSE/LOCK/LOCKU...) 3324 * It is actually a sign of a bug on the client or on the server. 3325 * 3326 * If we receive a BAD_SEQID error in the particular case of 3327 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3328 * have unhashed the old state_owner for us, and that we can 3329 * therefore safely retry using a new one. We should still warn 3330 * the user though... 3331 */ 3332 if (status == -NFS4ERR_BAD_SEQID) { 3333 pr_warn_ratelimited("NFS: v4 server %s " 3334 " returned a bad sequence-id error!\n", 3335 NFS_SERVER(dir)->nfs_client->cl_hostname); 3336 exception.retry = 1; 3337 continue; 3338 } 3339 /* 3340 * BAD_STATEID on OPEN means that the server cancelled our 3341 * state before it received the OPEN_CONFIRM. 3342 * Recover by retrying the request as per the discussion 3343 * on Page 181 of RFC3530. 3344 */ 3345 if (status == -NFS4ERR_BAD_STATEID) { 3346 exception.retry = 1; 3347 continue; 3348 } 3349 if (status == -NFS4ERR_EXPIRED) { 3350 nfs4_schedule_lease_recovery(server->nfs_client); 3351 exception.retry = 1; 3352 continue; 3353 } 3354 if (status == -EAGAIN) { 3355 /* We must have found a delegation */ 3356 exception.retry = 1; 3357 continue; 3358 } 3359 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3360 continue; 3361 res = ERR_PTR(nfs4_handle_exception(server, 3362 status, &exception)); 3363 } while (exception.retry); 3364 return res; 3365 } 3366 3367 static int _nfs4_do_setattr(struct inode *inode, 3368 struct nfs_setattrargs *arg, 3369 struct nfs_setattrres *res, 3370 const struct cred *cred, 3371 struct nfs_open_context *ctx) 3372 { 3373 struct nfs_server *server = NFS_SERVER(inode); 3374 struct rpc_message msg = { 3375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3376 .rpc_argp = arg, 3377 .rpc_resp = res, 3378 .rpc_cred = cred, 3379 }; 3380 const struct cred *delegation_cred = NULL; 3381 unsigned long timestamp = jiffies; 3382 bool truncate; 3383 int status; 3384 3385 nfs_fattr_init(res->fattr); 3386 3387 /* Servers should only apply open mode checks for file size changes */ 3388 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3389 if (!truncate) { 3390 nfs4_inode_make_writeable(inode); 3391 goto zero_stateid; 3392 } 3393 3394 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3395 /* Use that stateid */ 3396 } else if (ctx != NULL && ctx->state) { 3397 struct nfs_lock_context *l_ctx; 3398 if (!nfs4_valid_open_stateid(ctx->state)) 3399 return -EBADF; 3400 l_ctx = nfs_get_lock_context(ctx); 3401 if (IS_ERR(l_ctx)) 3402 return PTR_ERR(l_ctx); 3403 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3404 &arg->stateid, &delegation_cred); 3405 nfs_put_lock_context(l_ctx); 3406 if (status == -EIO) 3407 return -EBADF; 3408 else if (status == -EAGAIN) 3409 goto zero_stateid; 3410 } else { 3411 zero_stateid: 3412 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3413 } 3414 if (delegation_cred) 3415 msg.rpc_cred = delegation_cred; 3416 3417 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3418 3419 put_cred(delegation_cred); 3420 if (status == 0 && ctx != NULL) 3421 renew_lease(server, timestamp); 3422 trace_nfs4_setattr(inode, &arg->stateid, status); 3423 return status; 3424 } 3425 3426 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3427 struct nfs_fattr *fattr, struct iattr *sattr, 3428 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3429 { 3430 struct nfs_server *server = NFS_SERVER(inode); 3431 __u32 bitmask[NFS4_BITMASK_SZ]; 3432 struct nfs4_state *state = ctx ? ctx->state : NULL; 3433 struct nfs_setattrargs arg = { 3434 .fh = NFS_FH(inode), 3435 .iap = sattr, 3436 .server = server, 3437 .bitmask = bitmask, 3438 .label = ilabel, 3439 }; 3440 struct nfs_setattrres res = { 3441 .fattr = fattr, 3442 .server = server, 3443 }; 3444 struct nfs4_exception exception = { 3445 .state = state, 3446 .inode = inode, 3447 .stateid = &arg.stateid, 3448 }; 3449 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE | 3450 NFS_INO_INVALID_CTIME; 3451 int err; 3452 3453 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3454 adjust_flags |= NFS_INO_INVALID_MODE; 3455 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3456 adjust_flags |= NFS_INO_INVALID_OTHER; 3457 if (sattr->ia_valid & ATTR_ATIME) 3458 adjust_flags |= NFS_INO_INVALID_ATIME; 3459 if (sattr->ia_valid & ATTR_MTIME) 3460 adjust_flags |= NFS_INO_INVALID_MTIME; 3461 3462 do { 3463 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3464 inode, adjust_flags); 3465 3466 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3467 switch (err) { 3468 case -NFS4ERR_OPENMODE: 3469 if (!(sattr->ia_valid & ATTR_SIZE)) { 3470 pr_warn_once("NFSv4: server %s is incorrectly " 3471 "applying open mode checks to " 3472 "a SETATTR that is not " 3473 "changing file size.\n", 3474 server->nfs_client->cl_hostname); 3475 } 3476 if (state && !(state->state & FMODE_WRITE)) { 3477 err = -EBADF; 3478 if (sattr->ia_valid & ATTR_OPEN) 3479 err = -EACCES; 3480 goto out; 3481 } 3482 } 3483 err = nfs4_handle_exception(server, err, &exception); 3484 } while (exception.retry); 3485 out: 3486 return err; 3487 } 3488 3489 static bool 3490 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3491 { 3492 if (inode == NULL || !nfs_have_layout(inode)) 3493 return false; 3494 3495 return pnfs_wait_on_layoutreturn(inode, task); 3496 } 3497 3498 /* 3499 * Update the seqid of an open stateid 3500 */ 3501 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3502 struct nfs4_state *state) 3503 { 3504 __be32 seqid_open; 3505 u32 dst_seqid; 3506 int seq; 3507 3508 for (;;) { 3509 if (!nfs4_valid_open_stateid(state)) 3510 break; 3511 seq = read_seqbegin(&state->seqlock); 3512 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3513 nfs4_stateid_copy(dst, &state->open_stateid); 3514 if (read_seqretry(&state->seqlock, seq)) 3515 continue; 3516 break; 3517 } 3518 seqid_open = state->open_stateid.seqid; 3519 if (read_seqretry(&state->seqlock, seq)) 3520 continue; 3521 3522 dst_seqid = be32_to_cpu(dst->seqid); 3523 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3524 dst->seqid = seqid_open; 3525 break; 3526 } 3527 } 3528 3529 /* 3530 * Update the seqid of an open stateid after receiving 3531 * NFS4ERR_OLD_STATEID 3532 */ 3533 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3534 struct nfs4_state *state) 3535 { 3536 __be32 seqid_open; 3537 u32 dst_seqid; 3538 bool ret; 3539 int seq, status = -EAGAIN; 3540 DEFINE_WAIT(wait); 3541 3542 for (;;) { 3543 ret = false; 3544 if (!nfs4_valid_open_stateid(state)) 3545 break; 3546 seq = read_seqbegin(&state->seqlock); 3547 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3548 if (read_seqretry(&state->seqlock, seq)) 3549 continue; 3550 break; 3551 } 3552 3553 write_seqlock(&state->seqlock); 3554 seqid_open = state->open_stateid.seqid; 3555 3556 dst_seqid = be32_to_cpu(dst->seqid); 3557 3558 /* Did another OPEN bump the state's seqid? try again: */ 3559 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3560 dst->seqid = seqid_open; 3561 write_sequnlock(&state->seqlock); 3562 ret = true; 3563 break; 3564 } 3565 3566 /* server says we're behind but we haven't seen the update yet */ 3567 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3568 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3569 write_sequnlock(&state->seqlock); 3570 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3571 3572 if (fatal_signal_pending(current)) 3573 status = -EINTR; 3574 else 3575 if (schedule_timeout(5*HZ) != 0) 3576 status = 0; 3577 3578 finish_wait(&state->waitq, &wait); 3579 3580 if (!status) 3581 continue; 3582 if (status == -EINTR) 3583 break; 3584 3585 /* we slept the whole 5 seconds, we must have lost a seqid */ 3586 dst->seqid = cpu_to_be32(dst_seqid + 1); 3587 ret = true; 3588 break; 3589 } 3590 3591 return ret; 3592 } 3593 3594 struct nfs4_closedata { 3595 struct inode *inode; 3596 struct nfs4_state *state; 3597 struct nfs_closeargs arg; 3598 struct nfs_closeres res; 3599 struct { 3600 struct nfs4_layoutreturn_args arg; 3601 struct nfs4_layoutreturn_res res; 3602 struct nfs4_xdr_opaque_data ld_private; 3603 u32 roc_barrier; 3604 bool roc; 3605 } lr; 3606 struct nfs_fattr fattr; 3607 unsigned long timestamp; 3608 }; 3609 3610 static void nfs4_free_closedata(void *data) 3611 { 3612 struct nfs4_closedata *calldata = data; 3613 struct nfs4_state_owner *sp = calldata->state->owner; 3614 struct super_block *sb = calldata->state->inode->i_sb; 3615 3616 if (calldata->lr.roc) 3617 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3618 calldata->res.lr_ret); 3619 nfs4_put_open_state(calldata->state); 3620 nfs_free_seqid(calldata->arg.seqid); 3621 nfs4_put_state_owner(sp); 3622 nfs_sb_deactive(sb); 3623 kfree(calldata); 3624 } 3625 3626 static void nfs4_close_done(struct rpc_task *task, void *data) 3627 { 3628 struct nfs4_closedata *calldata = data; 3629 struct nfs4_state *state = calldata->state; 3630 struct nfs_server *server = NFS_SERVER(calldata->inode); 3631 nfs4_stateid *res_stateid = NULL; 3632 struct nfs4_exception exception = { 3633 .state = state, 3634 .inode = calldata->inode, 3635 .stateid = &calldata->arg.stateid, 3636 }; 3637 3638 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3639 return; 3640 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3641 3642 /* Handle Layoutreturn errors */ 3643 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3644 &calldata->res.lr_ret) == -EAGAIN) 3645 goto out_restart; 3646 3647 /* hmm. we are done with the inode, and in the process of freeing 3648 * the state_owner. we keep this around to process errors 3649 */ 3650 switch (task->tk_status) { 3651 case 0: 3652 res_stateid = &calldata->res.stateid; 3653 renew_lease(server, calldata->timestamp); 3654 break; 3655 case -NFS4ERR_ACCESS: 3656 if (calldata->arg.bitmask != NULL) { 3657 calldata->arg.bitmask = NULL; 3658 calldata->res.fattr = NULL; 3659 goto out_restart; 3660 3661 } 3662 break; 3663 case -NFS4ERR_OLD_STATEID: 3664 /* Did we race with OPEN? */ 3665 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3666 state)) 3667 goto out_restart; 3668 goto out_release; 3669 case -NFS4ERR_ADMIN_REVOKED: 3670 case -NFS4ERR_STALE_STATEID: 3671 case -NFS4ERR_EXPIRED: 3672 nfs4_free_revoked_stateid(server, 3673 &calldata->arg.stateid, 3674 task->tk_msg.rpc_cred); 3675 fallthrough; 3676 case -NFS4ERR_BAD_STATEID: 3677 if (calldata->arg.fmode == 0) 3678 break; 3679 fallthrough; 3680 default: 3681 task->tk_status = nfs4_async_handle_exception(task, 3682 server, task->tk_status, &exception); 3683 if (exception.retry) 3684 goto out_restart; 3685 } 3686 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3687 res_stateid, calldata->arg.fmode); 3688 out_release: 3689 task->tk_status = 0; 3690 nfs_release_seqid(calldata->arg.seqid); 3691 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3692 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3693 return; 3694 out_restart: 3695 task->tk_status = 0; 3696 rpc_restart_call_prepare(task); 3697 goto out_release; 3698 } 3699 3700 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3701 { 3702 struct nfs4_closedata *calldata = data; 3703 struct nfs4_state *state = calldata->state; 3704 struct inode *inode = calldata->inode; 3705 struct nfs_server *server = NFS_SERVER(inode); 3706 struct pnfs_layout_hdr *lo; 3707 bool is_rdonly, is_wronly, is_rdwr; 3708 int call_close = 0; 3709 3710 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3711 goto out_wait; 3712 3713 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3714 spin_lock(&state->owner->so_lock); 3715 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3716 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3717 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3718 /* Calculate the change in open mode */ 3719 calldata->arg.fmode = 0; 3720 if (state->n_rdwr == 0) { 3721 if (state->n_rdonly == 0) 3722 call_close |= is_rdonly; 3723 else if (is_rdonly) 3724 calldata->arg.fmode |= FMODE_READ; 3725 if (state->n_wronly == 0) 3726 call_close |= is_wronly; 3727 else if (is_wronly) 3728 calldata->arg.fmode |= FMODE_WRITE; 3729 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3730 call_close |= is_rdwr; 3731 } else if (is_rdwr) 3732 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3733 3734 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3735 if (!nfs4_valid_open_stateid(state)) 3736 call_close = 0; 3737 spin_unlock(&state->owner->so_lock); 3738 3739 if (!call_close) { 3740 /* Note: exit _without_ calling nfs4_close_done */ 3741 goto out_no_action; 3742 } 3743 3744 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3745 nfs_release_seqid(calldata->arg.seqid); 3746 goto out_wait; 3747 } 3748 3749 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3750 if (lo && !pnfs_layout_is_valid(lo)) { 3751 calldata->arg.lr_args = NULL; 3752 calldata->res.lr_res = NULL; 3753 } 3754 3755 if (calldata->arg.fmode == 0) 3756 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3757 3758 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3759 /* Close-to-open cache consistency revalidation */ 3760 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) { 3761 nfs4_bitmask_set(calldata->arg.bitmask_store, 3762 server->cache_consistency_bitmask, 3763 inode, 0); 3764 calldata->arg.bitmask = calldata->arg.bitmask_store; 3765 } else 3766 calldata->arg.bitmask = NULL; 3767 } 3768 3769 calldata->arg.share_access = 3770 nfs4_fmode_to_share_access(calldata->arg.fmode); 3771 3772 if (calldata->res.fattr == NULL) 3773 calldata->arg.bitmask = NULL; 3774 else if (calldata->arg.bitmask == NULL) 3775 calldata->res.fattr = NULL; 3776 calldata->timestamp = jiffies; 3777 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3778 &calldata->arg.seq_args, 3779 &calldata->res.seq_res, 3780 task) != 0) 3781 nfs_release_seqid(calldata->arg.seqid); 3782 return; 3783 out_no_action: 3784 task->tk_action = NULL; 3785 out_wait: 3786 nfs4_sequence_done(task, &calldata->res.seq_res); 3787 } 3788 3789 static const struct rpc_call_ops nfs4_close_ops = { 3790 .rpc_call_prepare = nfs4_close_prepare, 3791 .rpc_call_done = nfs4_close_done, 3792 .rpc_release = nfs4_free_closedata, 3793 }; 3794 3795 /* 3796 * It is possible for data to be read/written from a mem-mapped file 3797 * after the sys_close call (which hits the vfs layer as a flush). 3798 * This means that we can't safely call nfsv4 close on a file until 3799 * the inode is cleared. This in turn means that we are not good 3800 * NFSv4 citizens - we do not indicate to the server to update the file's 3801 * share state even when we are done with one of the three share 3802 * stateid's in the inode. 3803 * 3804 * NOTE: Caller must be holding the sp->so_owner semaphore! 3805 */ 3806 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3807 { 3808 struct nfs_server *server = NFS_SERVER(state->inode); 3809 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3810 struct nfs4_closedata *calldata; 3811 struct nfs4_state_owner *sp = state->owner; 3812 struct rpc_task *task; 3813 struct rpc_message msg = { 3814 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3815 .rpc_cred = state->owner->so_cred, 3816 }; 3817 struct rpc_task_setup task_setup_data = { 3818 .rpc_client = server->client, 3819 .rpc_message = &msg, 3820 .callback_ops = &nfs4_close_ops, 3821 .workqueue = nfsiod_workqueue, 3822 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3823 }; 3824 int status = -ENOMEM; 3825 3826 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3827 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3828 3829 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3830 &task_setup_data.rpc_client, &msg); 3831 3832 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3833 if (calldata == NULL) 3834 goto out; 3835 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3836 calldata->inode = state->inode; 3837 calldata->state = state; 3838 calldata->arg.fh = NFS_FH(state->inode); 3839 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3840 goto out_free_calldata; 3841 /* Serialization for the sequence id */ 3842 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3843 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3844 if (IS_ERR(calldata->arg.seqid)) 3845 goto out_free_calldata; 3846 nfs_fattr_init(&calldata->fattr); 3847 calldata->arg.fmode = 0; 3848 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3849 calldata->res.fattr = &calldata->fattr; 3850 calldata->res.seqid = calldata->arg.seqid; 3851 calldata->res.server = server; 3852 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3853 calldata->lr.roc = pnfs_roc(state->inode, 3854 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3855 if (calldata->lr.roc) { 3856 calldata->arg.lr_args = &calldata->lr.arg; 3857 calldata->res.lr_res = &calldata->lr.res; 3858 } 3859 nfs_sb_active(calldata->inode->i_sb); 3860 3861 msg.rpc_argp = &calldata->arg; 3862 msg.rpc_resp = &calldata->res; 3863 task_setup_data.callback_data = calldata; 3864 task = rpc_run_task(&task_setup_data); 3865 if (IS_ERR(task)) 3866 return PTR_ERR(task); 3867 status = 0; 3868 if (wait) 3869 status = rpc_wait_for_completion_task(task); 3870 rpc_put_task(task); 3871 return status; 3872 out_free_calldata: 3873 kfree(calldata); 3874 out: 3875 nfs4_put_open_state(state); 3876 nfs4_put_state_owner(sp); 3877 return status; 3878 } 3879 3880 static struct inode * 3881 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3882 int open_flags, struct iattr *attr, int *opened) 3883 { 3884 struct nfs4_state *state; 3885 struct nfs4_label l, *label; 3886 3887 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3888 3889 /* Protect against concurrent sillydeletes */ 3890 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3891 3892 nfs4_label_release_security(label); 3893 3894 if (IS_ERR(state)) 3895 return ERR_CAST(state); 3896 return state->inode; 3897 } 3898 3899 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3900 { 3901 if (ctx->state == NULL) 3902 return; 3903 if (is_sync) 3904 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3905 else 3906 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3907 } 3908 3909 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3910 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3911 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_OPEN_ARGUMENTS - 1UL) 3912 3913 #define FATTR4_WORD2_NFS42_TIME_DELEG_MASK \ 3914 (FATTR4_WORD2_TIME_DELEG_MODIFY|FATTR4_WORD2_TIME_DELEG_ACCESS) 3915 static bool nfs4_server_delegtime_capable(struct nfs4_server_caps_res *res) 3916 { 3917 u32 share_access_want = res->open_caps.oa_share_access_want[0]; 3918 u32 attr_bitmask = res->attr_bitmask[2]; 3919 3920 return (share_access_want & NFS4_SHARE_WANT_DELEG_TIMESTAMPS) && 3921 ((attr_bitmask & FATTR4_WORD2_NFS42_TIME_DELEG_MASK) == 3922 FATTR4_WORD2_NFS42_TIME_DELEG_MASK); 3923 } 3924 3925 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3926 { 3927 u32 minorversion = server->nfs_client->cl_minorversion; 3928 u32 bitmask[3] = { 3929 [0] = FATTR4_WORD0_SUPPORTED_ATTRS, 3930 }; 3931 struct nfs4_server_caps_arg args = { 3932 .fhandle = fhandle, 3933 .bitmask = bitmask, 3934 }; 3935 struct nfs4_server_caps_res res = {}; 3936 struct rpc_message msg = { 3937 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3938 .rpc_argp = &args, 3939 .rpc_resp = &res, 3940 }; 3941 int status; 3942 int i; 3943 3944 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3945 FATTR4_WORD0_FH_EXPIRE_TYPE | 3946 FATTR4_WORD0_LINK_SUPPORT | 3947 FATTR4_WORD0_SYMLINK_SUPPORT | 3948 FATTR4_WORD0_ACLSUPPORT | 3949 FATTR4_WORD0_CASE_INSENSITIVE | 3950 FATTR4_WORD0_CASE_PRESERVING; 3951 if (minorversion) 3952 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT | 3953 FATTR4_WORD2_OPEN_ARGUMENTS; 3954 3955 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3956 if (status == 0) { 3957 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS | 3958 FATTR4_WORD0_FH_EXPIRE_TYPE | 3959 FATTR4_WORD0_LINK_SUPPORT | 3960 FATTR4_WORD0_SYMLINK_SUPPORT | 3961 FATTR4_WORD0_ACLSUPPORT | 3962 FATTR4_WORD0_CASE_INSENSITIVE | 3963 FATTR4_WORD0_CASE_PRESERVING) & 3964 res.attr_bitmask[0]; 3965 /* Sanity check the server answers */ 3966 switch (minorversion) { 3967 case 0: 3968 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3969 res.attr_bitmask[2] = 0; 3970 break; 3971 case 1: 3972 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3973 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT & 3974 res.attr_bitmask[2]; 3975 break; 3976 case 2: 3977 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3978 bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT | 3979 FATTR4_WORD2_OPEN_ARGUMENTS) & 3980 res.attr_bitmask[2]; 3981 } 3982 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3983 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3984 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3985 server->fattr_valid = NFS_ATTR_FATTR_V4; 3986 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3987 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3988 server->caps |= NFS_CAP_ACLS; 3989 if (res.has_links != 0) 3990 server->caps |= NFS_CAP_HARDLINKS; 3991 if (res.has_symlinks != 0) 3992 server->caps |= NFS_CAP_SYMLINKS; 3993 if (res.case_insensitive) 3994 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3995 if (res.case_preserving) 3996 server->caps |= NFS_CAP_CASE_PRESERVING; 3997 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3998 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3999 server->caps |= NFS_CAP_SECURITY_LABEL; 4000 #endif 4001 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 4002 server->caps |= NFS_CAP_FS_LOCATIONS; 4003 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 4004 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 4005 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 4006 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 4007 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 4008 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 4009 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 4010 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 4011 NFS_ATTR_FATTR_OWNER_NAME); 4012 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 4013 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 4014 NFS_ATTR_FATTR_GROUP_NAME); 4015 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 4016 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 4017 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 4018 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 4019 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 4020 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 4021 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 4022 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 4023 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 4024 sizeof(server->attr_bitmask)); 4025 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 4026 4027 if (res.open_caps.oa_share_access_want[0] & 4028 NFS4_SHARE_WANT_OPEN_XOR_DELEGATION) 4029 server->caps |= NFS_CAP_OPEN_XOR; 4030 if (nfs4_server_delegtime_capable(&res)) 4031 server->caps |= NFS_CAP_DELEGTIME; 4032 4033 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 4034 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 4035 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 4036 server->cache_consistency_bitmask[2] = 0; 4037 4038 /* Avoid a regression due to buggy server */ 4039 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 4040 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 4041 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 4042 sizeof(server->exclcreat_bitmask)); 4043 4044 server->acl_bitmask = res.acl_bitmask; 4045 server->fh_expire_type = res.fh_expire_type; 4046 } 4047 4048 return status; 4049 } 4050 4051 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 4052 { 4053 struct nfs4_exception exception = { 4054 .interruptible = true, 4055 }; 4056 int err; 4057 4058 nfs4_server_set_init_caps(server); 4059 do { 4060 err = nfs4_handle_exception(server, 4061 _nfs4_server_capabilities(server, fhandle), 4062 &exception); 4063 } while (exception.retry); 4064 return err; 4065 } 4066 4067 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 4068 struct nfs_client *clp, 4069 struct nfs_server *server) 4070 { 4071 int i; 4072 4073 for (i = 0; i < location->nservers; i++) { 4074 struct nfs4_string *srv_loc = &location->servers[i]; 4075 struct sockaddr_storage addr; 4076 size_t addrlen; 4077 struct xprt_create xprt_args = { 4078 .ident = 0, 4079 .net = clp->cl_net, 4080 }; 4081 struct nfs4_add_xprt_data xprtdata = { 4082 .clp = clp, 4083 }; 4084 struct rpc_add_xprt_test rpcdata = { 4085 .add_xprt_test = clp->cl_mvops->session_trunk, 4086 .data = &xprtdata, 4087 }; 4088 char *servername = NULL; 4089 4090 if (!srv_loc->len) 4091 continue; 4092 4093 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 4094 &addr, sizeof(addr), 4095 clp->cl_net, server->port); 4096 if (!addrlen) 4097 return; 4098 xprt_args.dstaddr = (struct sockaddr *)&addr; 4099 xprt_args.addrlen = addrlen; 4100 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 4101 if (!servername) 4102 return; 4103 memcpy(servername, srv_loc->data, srv_loc->len); 4104 servername[srv_loc->len] = '\0'; 4105 xprt_args.servername = servername; 4106 4107 xprtdata.cred = nfs4_get_clid_cred(clp); 4108 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 4109 rpc_clnt_setup_test_and_add_xprt, 4110 &rpcdata); 4111 if (xprtdata.cred) 4112 put_cred(xprtdata.cred); 4113 kfree(servername); 4114 } 4115 } 4116 4117 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1, 4118 struct nfs4_pathname *path2) 4119 { 4120 int i; 4121 4122 if (path1->ncomponents != path2->ncomponents) 4123 return false; 4124 for (i = 0; i < path1->ncomponents; i++) { 4125 if (path1->components[i].len != path2->components[i].len) 4126 return false; 4127 if (memcmp(path1->components[i].data, path2->components[i].data, 4128 path1->components[i].len)) 4129 return false; 4130 } 4131 return true; 4132 } 4133 4134 static int _nfs4_discover_trunking(struct nfs_server *server, 4135 struct nfs_fh *fhandle) 4136 { 4137 struct nfs4_fs_locations *locations = NULL; 4138 struct page *page; 4139 const struct cred *cred; 4140 struct nfs_client *clp = server->nfs_client; 4141 const struct nfs4_state_maintenance_ops *ops = 4142 clp->cl_mvops->state_renewal_ops; 4143 int status = -ENOMEM, i; 4144 4145 cred = ops->get_state_renewal_cred(clp); 4146 if (cred == NULL) { 4147 cred = nfs4_get_clid_cred(clp); 4148 if (cred == NULL) 4149 return -ENOKEY; 4150 } 4151 4152 page = alloc_page(GFP_KERNEL); 4153 if (!page) 4154 goto out_put_cred; 4155 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4156 if (!locations) 4157 goto out_free; 4158 locations->fattr = nfs_alloc_fattr(); 4159 if (!locations->fattr) 4160 goto out_free_2; 4161 4162 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4163 cred); 4164 if (status) 4165 goto out_free_3; 4166 4167 for (i = 0; i < locations->nlocations; i++) { 4168 if (!_is_same_nfs4_pathname(&locations->fs_path, 4169 &locations->locations[i].rootpath)) 4170 continue; 4171 test_fs_location_for_trunking(&locations->locations[i], clp, 4172 server); 4173 } 4174 out_free_3: 4175 kfree(locations->fattr); 4176 out_free_2: 4177 kfree(locations); 4178 out_free: 4179 __free_page(page); 4180 out_put_cred: 4181 put_cred(cred); 4182 return status; 4183 } 4184 4185 static int nfs4_discover_trunking(struct nfs_server *server, 4186 struct nfs_fh *fhandle) 4187 { 4188 struct nfs4_exception exception = { 4189 .interruptible = true, 4190 }; 4191 struct nfs_client *clp = server->nfs_client; 4192 int err = 0; 4193 4194 if (!nfs4_has_session(clp)) 4195 goto out; 4196 do { 4197 err = nfs4_handle_exception(server, 4198 _nfs4_discover_trunking(server, fhandle), 4199 &exception); 4200 } while (exception.retry); 4201 out: 4202 return err; 4203 } 4204 4205 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4206 struct nfs_fsinfo *info) 4207 { 4208 u32 bitmask[3]; 4209 struct nfs4_lookup_root_arg args = { 4210 .bitmask = bitmask, 4211 }; 4212 struct nfs4_lookup_res res = { 4213 .server = server, 4214 .fattr = info->fattr, 4215 .fh = fhandle, 4216 }; 4217 struct rpc_message msg = { 4218 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4219 .rpc_argp = &args, 4220 .rpc_resp = &res, 4221 }; 4222 4223 bitmask[0] = nfs4_fattr_bitmap[0]; 4224 bitmask[1] = nfs4_fattr_bitmap[1]; 4225 /* 4226 * Process the label in the upcoming getfattr 4227 */ 4228 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4229 4230 nfs_fattr_init(info->fattr); 4231 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4232 } 4233 4234 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4235 struct nfs_fsinfo *info) 4236 { 4237 struct nfs4_exception exception = { 4238 .interruptible = true, 4239 }; 4240 int err; 4241 do { 4242 err = _nfs4_lookup_root(server, fhandle, info); 4243 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4244 switch (err) { 4245 case 0: 4246 case -NFS4ERR_WRONGSEC: 4247 goto out; 4248 default: 4249 err = nfs4_handle_exception(server, err, &exception); 4250 } 4251 } while (exception.retry); 4252 out: 4253 return err; 4254 } 4255 4256 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4257 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4258 { 4259 struct rpc_auth_create_args auth_args = { 4260 .pseudoflavor = flavor, 4261 }; 4262 struct rpc_auth *auth; 4263 4264 auth = rpcauth_create(&auth_args, server->client); 4265 if (IS_ERR(auth)) 4266 return -EACCES; 4267 return nfs4_lookup_root(server, fhandle, info); 4268 } 4269 4270 /* 4271 * Retry pseudoroot lookup with various security flavors. We do this when: 4272 * 4273 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4274 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4275 * 4276 * Returns zero on success, or a negative NFS4ERR value, or a 4277 * negative errno value. 4278 */ 4279 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4280 struct nfs_fsinfo *info) 4281 { 4282 /* Per 3530bis 15.33.5 */ 4283 static const rpc_authflavor_t flav_array[] = { 4284 RPC_AUTH_GSS_KRB5P, 4285 RPC_AUTH_GSS_KRB5I, 4286 RPC_AUTH_GSS_KRB5, 4287 RPC_AUTH_UNIX, /* courtesy */ 4288 RPC_AUTH_NULL, 4289 }; 4290 int status = -EPERM; 4291 size_t i; 4292 4293 if (server->auth_info.flavor_len > 0) { 4294 /* try each flavor specified by user */ 4295 for (i = 0; i < server->auth_info.flavor_len; i++) { 4296 status = nfs4_lookup_root_sec(server, fhandle, info, 4297 server->auth_info.flavors[i]); 4298 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4299 continue; 4300 break; 4301 } 4302 } else { 4303 /* no flavors specified by user, try default list */ 4304 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4305 status = nfs4_lookup_root_sec(server, fhandle, info, 4306 flav_array[i]); 4307 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4308 continue; 4309 break; 4310 } 4311 } 4312 4313 /* 4314 * -EACCES could mean that the user doesn't have correct permissions 4315 * to access the mount. It could also mean that we tried to mount 4316 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4317 * existing mount programs don't handle -EACCES very well so it should 4318 * be mapped to -EPERM instead. 4319 */ 4320 if (status == -EACCES) 4321 status = -EPERM; 4322 return status; 4323 } 4324 4325 /** 4326 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4327 * @server: initialized nfs_server handle 4328 * @fhandle: we fill in the pseudo-fs root file handle 4329 * @info: we fill in an FSINFO struct 4330 * @auth_probe: probe the auth flavours 4331 * 4332 * Returns zero on success, or a negative errno. 4333 */ 4334 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4335 struct nfs_fsinfo *info, 4336 bool auth_probe) 4337 { 4338 int status = 0; 4339 4340 if (!auth_probe) 4341 status = nfs4_lookup_root(server, fhandle, info); 4342 4343 if (auth_probe || status == NFS4ERR_WRONGSEC) 4344 status = server->nfs_client->cl_mvops->find_root_sec(server, 4345 fhandle, info); 4346 4347 if (status == 0) 4348 status = nfs4_server_capabilities(server, fhandle); 4349 if (status == 0) 4350 status = nfs4_do_fsinfo(server, fhandle, info); 4351 4352 return nfs4_map_errors(status); 4353 } 4354 4355 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4356 struct nfs_fsinfo *info) 4357 { 4358 int error; 4359 struct nfs_fattr *fattr = info->fattr; 4360 4361 error = nfs4_server_capabilities(server, mntfh); 4362 if (error < 0) { 4363 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4364 return error; 4365 } 4366 4367 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4368 if (error < 0) { 4369 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4370 goto out; 4371 } 4372 4373 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4374 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4375 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4376 4377 out: 4378 return error; 4379 } 4380 4381 /* 4382 * Get locations and (maybe) other attributes of a referral. 4383 * Note that we'll actually follow the referral later when 4384 * we detect fsid mismatch in inode revalidation 4385 */ 4386 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4387 const struct qstr *name, struct nfs_fattr *fattr, 4388 struct nfs_fh *fhandle) 4389 { 4390 int status = -ENOMEM; 4391 struct page *page = NULL; 4392 struct nfs4_fs_locations *locations = NULL; 4393 4394 page = alloc_page(GFP_KERNEL); 4395 if (page == NULL) 4396 goto out; 4397 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4398 if (locations == NULL) 4399 goto out; 4400 4401 locations->fattr = fattr; 4402 4403 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4404 if (status != 0) 4405 goto out; 4406 4407 /* 4408 * If the fsid didn't change, this is a migration event, not a 4409 * referral. Cause us to drop into the exception handler, which 4410 * will kick off migration recovery. 4411 */ 4412 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4413 dprintk("%s: server did not return a different fsid for" 4414 " a referral at %s\n", __func__, name->name); 4415 status = -NFS4ERR_MOVED; 4416 goto out; 4417 } 4418 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4419 nfs_fixup_referral_attributes(fattr); 4420 memset(fhandle, 0, sizeof(struct nfs_fh)); 4421 out: 4422 if (page) 4423 __free_page(page); 4424 kfree(locations); 4425 return status; 4426 } 4427 4428 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4429 struct nfs_fattr *fattr, struct inode *inode) 4430 { 4431 __u32 bitmask[NFS4_BITMASK_SZ]; 4432 struct nfs4_getattr_arg args = { 4433 .fh = fhandle, 4434 .bitmask = bitmask, 4435 }; 4436 struct nfs4_getattr_res res = { 4437 .fattr = fattr, 4438 .server = server, 4439 }; 4440 struct rpc_message msg = { 4441 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4442 .rpc_argp = &args, 4443 .rpc_resp = &res, 4444 }; 4445 unsigned short task_flags = 0; 4446 4447 if (nfs4_has_session(server->nfs_client)) 4448 task_flags = RPC_TASK_MOVEABLE; 4449 4450 /* Is this is an attribute revalidation, subject to softreval? */ 4451 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4452 task_flags |= RPC_TASK_TIMEOUT; 4453 4454 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4455 nfs_fattr_init(fattr); 4456 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4457 return nfs4_do_call_sync(server->client, server, &msg, 4458 &args.seq_args, &res.seq_res, task_flags); 4459 } 4460 4461 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4462 struct nfs_fattr *fattr, struct inode *inode) 4463 { 4464 struct nfs4_exception exception = { 4465 .interruptible = true, 4466 }; 4467 int err; 4468 do { 4469 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4470 trace_nfs4_getattr(server, fhandle, fattr, err); 4471 err = nfs4_handle_exception(server, err, 4472 &exception); 4473 } while (exception.retry); 4474 return err; 4475 } 4476 4477 /* 4478 * The file is not closed if it is opened due to the a request to change 4479 * the size of the file. The open call will not be needed once the 4480 * VFS layer lookup-intents are implemented. 4481 * 4482 * Close is called when the inode is destroyed. 4483 * If we haven't opened the file for O_WRONLY, we 4484 * need to in the size_change case to obtain a stateid. 4485 * 4486 * Got race? 4487 * Because OPEN is always done by name in nfsv4, it is 4488 * possible that we opened a different file by the same 4489 * name. We can recognize this race condition, but we 4490 * can't do anything about it besides returning an error. 4491 * 4492 * This will be fixed with VFS changes (lookup-intent). 4493 */ 4494 static int 4495 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4496 struct iattr *sattr) 4497 { 4498 struct inode *inode = d_inode(dentry); 4499 const struct cred *cred = NULL; 4500 struct nfs_open_context *ctx = NULL; 4501 int status; 4502 4503 if (pnfs_ld_layoutret_on_setattr(inode) && 4504 sattr->ia_valid & ATTR_SIZE && 4505 sattr->ia_size < i_size_read(inode)) 4506 pnfs_commit_and_return_layout(inode); 4507 4508 nfs_fattr_init(fattr); 4509 4510 /* Deal with open(O_TRUNC) */ 4511 if (sattr->ia_valid & ATTR_OPEN) 4512 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4513 4514 /* Optimization: if the end result is no change, don't RPC */ 4515 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4516 return 0; 4517 4518 /* Search for an existing open(O_WRITE) file */ 4519 if (sattr->ia_valid & ATTR_FILE) { 4520 4521 ctx = nfs_file_open_context(sattr->ia_file); 4522 if (ctx) 4523 cred = ctx->cred; 4524 } 4525 4526 /* Return any delegations if we're going to change ACLs */ 4527 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4528 nfs4_inode_make_writeable(inode); 4529 4530 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4531 if (status == 0) { 4532 nfs_setattr_update_inode(inode, sattr, fattr); 4533 nfs_setsecurity(inode, fattr); 4534 } 4535 return status; 4536 } 4537 4538 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4539 struct dentry *dentry, struct nfs_fh *fhandle, 4540 struct nfs_fattr *fattr) 4541 { 4542 struct nfs_server *server = NFS_SERVER(dir); 4543 int status; 4544 struct nfs4_lookup_arg args = { 4545 .bitmask = server->attr_bitmask, 4546 .dir_fh = NFS_FH(dir), 4547 .name = &dentry->d_name, 4548 }; 4549 struct nfs4_lookup_res res = { 4550 .server = server, 4551 .fattr = fattr, 4552 .fh = fhandle, 4553 }; 4554 struct rpc_message msg = { 4555 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4556 .rpc_argp = &args, 4557 .rpc_resp = &res, 4558 }; 4559 unsigned short task_flags = 0; 4560 4561 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4562 task_flags = RPC_TASK_MOVEABLE; 4563 4564 /* Is this is an attribute revalidation, subject to softreval? */ 4565 if (nfs_lookup_is_soft_revalidate(dentry)) 4566 task_flags |= RPC_TASK_TIMEOUT; 4567 4568 args.bitmask = nfs4_bitmask(server, fattr->label); 4569 4570 nfs_fattr_init(fattr); 4571 4572 dprintk("NFS call lookup %pd2\n", dentry); 4573 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4574 status = nfs4_do_call_sync(clnt, server, &msg, 4575 &args.seq_args, &res.seq_res, task_flags); 4576 dprintk("NFS reply lookup: %d\n", status); 4577 return status; 4578 } 4579 4580 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4581 { 4582 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4583 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4584 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4585 fattr->nlink = 2; 4586 } 4587 4588 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4589 struct dentry *dentry, struct nfs_fh *fhandle, 4590 struct nfs_fattr *fattr) 4591 { 4592 struct nfs4_exception exception = { 4593 .interruptible = true, 4594 }; 4595 struct rpc_clnt *client = *clnt; 4596 const struct qstr *name = &dentry->d_name; 4597 int err; 4598 do { 4599 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4600 trace_nfs4_lookup(dir, name, err); 4601 switch (err) { 4602 case -NFS4ERR_BADNAME: 4603 err = -ENOENT; 4604 goto out; 4605 case -NFS4ERR_MOVED: 4606 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4607 if (err == -NFS4ERR_MOVED) 4608 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4609 goto out; 4610 case -NFS4ERR_WRONGSEC: 4611 err = -EPERM; 4612 if (client != *clnt) 4613 goto out; 4614 client = nfs4_negotiate_security(client, dir, name); 4615 if (IS_ERR(client)) 4616 return PTR_ERR(client); 4617 4618 exception.retry = 1; 4619 break; 4620 default: 4621 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4622 } 4623 } while (exception.retry); 4624 4625 out: 4626 if (err == 0) 4627 *clnt = client; 4628 else if (client != *clnt) 4629 rpc_shutdown_client(client); 4630 4631 return err; 4632 } 4633 4634 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4635 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4636 { 4637 int status; 4638 struct rpc_clnt *client = NFS_CLIENT(dir); 4639 4640 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4641 if (client != NFS_CLIENT(dir)) { 4642 rpc_shutdown_client(client); 4643 nfs_fixup_secinfo_attributes(fattr); 4644 } 4645 return status; 4646 } 4647 4648 struct rpc_clnt * 4649 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4650 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4651 { 4652 struct rpc_clnt *client = NFS_CLIENT(dir); 4653 int status; 4654 4655 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4656 if (status < 0) 4657 return ERR_PTR(status); 4658 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4659 } 4660 4661 static int _nfs4_proc_lookupp(struct inode *inode, 4662 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4663 { 4664 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4665 struct nfs_server *server = NFS_SERVER(inode); 4666 int status; 4667 struct nfs4_lookupp_arg args = { 4668 .bitmask = server->attr_bitmask, 4669 .fh = NFS_FH(inode), 4670 }; 4671 struct nfs4_lookupp_res res = { 4672 .server = server, 4673 .fattr = fattr, 4674 .fh = fhandle, 4675 }; 4676 struct rpc_message msg = { 4677 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4678 .rpc_argp = &args, 4679 .rpc_resp = &res, 4680 }; 4681 unsigned short task_flags = 0; 4682 4683 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4684 task_flags |= RPC_TASK_TIMEOUT; 4685 4686 args.bitmask = nfs4_bitmask(server, fattr->label); 4687 4688 nfs_fattr_init(fattr); 4689 4690 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4691 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4692 &res.seq_res, task_flags); 4693 dprintk("NFS reply lookupp: %d\n", status); 4694 return status; 4695 } 4696 4697 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4698 struct nfs_fattr *fattr) 4699 { 4700 struct nfs4_exception exception = { 4701 .interruptible = true, 4702 }; 4703 int err; 4704 do { 4705 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4706 trace_nfs4_lookupp(inode, err); 4707 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4708 &exception); 4709 } while (exception.retry); 4710 return err; 4711 } 4712 4713 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4714 const struct cred *cred) 4715 { 4716 struct nfs_server *server = NFS_SERVER(inode); 4717 struct nfs4_accessargs args = { 4718 .fh = NFS_FH(inode), 4719 .access = entry->mask, 4720 }; 4721 struct nfs4_accessres res = { 4722 .server = server, 4723 }; 4724 struct rpc_message msg = { 4725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4726 .rpc_argp = &args, 4727 .rpc_resp = &res, 4728 .rpc_cred = cred, 4729 }; 4730 int status = 0; 4731 4732 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) { 4733 res.fattr = nfs_alloc_fattr(); 4734 if (res.fattr == NULL) 4735 return -ENOMEM; 4736 args.bitmask = server->cache_consistency_bitmask; 4737 } 4738 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4739 if (!status) { 4740 nfs_access_set_mask(entry, res.access); 4741 if (res.fattr) 4742 nfs_refresh_inode(inode, res.fattr); 4743 } 4744 nfs_free_fattr(res.fattr); 4745 return status; 4746 } 4747 4748 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4749 const struct cred *cred) 4750 { 4751 struct nfs4_exception exception = { 4752 .interruptible = true, 4753 }; 4754 int err; 4755 do { 4756 err = _nfs4_proc_access(inode, entry, cred); 4757 trace_nfs4_access(inode, err); 4758 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4759 &exception); 4760 } while (exception.retry); 4761 return err; 4762 } 4763 4764 /* 4765 * TODO: For the time being, we don't try to get any attributes 4766 * along with any of the zero-copy operations READ, READDIR, 4767 * READLINK, WRITE. 4768 * 4769 * In the case of the first three, we want to put the GETATTR 4770 * after the read-type operation -- this is because it is hard 4771 * to predict the length of a GETATTR response in v4, and thus 4772 * align the READ data correctly. This means that the GETATTR 4773 * may end up partially falling into the page cache, and we should 4774 * shift it into the 'tail' of the xdr_buf before processing. 4775 * To do this efficiently, we need to know the total length 4776 * of data received, which doesn't seem to be available outside 4777 * of the RPC layer. 4778 * 4779 * In the case of WRITE, we also want to put the GETATTR after 4780 * the operation -- in this case because we want to make sure 4781 * we get the post-operation mtime and size. 4782 * 4783 * Both of these changes to the XDR layer would in fact be quite 4784 * minor, but I decided to leave them for a subsequent patch. 4785 */ 4786 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4787 unsigned int pgbase, unsigned int pglen) 4788 { 4789 struct nfs4_readlink args = { 4790 .fh = NFS_FH(inode), 4791 .pgbase = pgbase, 4792 .pglen = pglen, 4793 .pages = &page, 4794 }; 4795 struct nfs4_readlink_res res; 4796 struct rpc_message msg = { 4797 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4798 .rpc_argp = &args, 4799 .rpc_resp = &res, 4800 }; 4801 4802 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4803 } 4804 4805 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4806 unsigned int pgbase, unsigned int pglen) 4807 { 4808 struct nfs4_exception exception = { 4809 .interruptible = true, 4810 }; 4811 int err; 4812 do { 4813 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4814 trace_nfs4_readlink(inode, err); 4815 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4816 &exception); 4817 } while (exception.retry); 4818 return err; 4819 } 4820 4821 /* 4822 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4823 */ 4824 static int 4825 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4826 int flags) 4827 { 4828 struct nfs_server *server = NFS_SERVER(dir); 4829 struct nfs4_label l, *ilabel; 4830 struct nfs_open_context *ctx; 4831 struct nfs4_state *state; 4832 int status = 0; 4833 4834 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4835 if (IS_ERR(ctx)) 4836 return PTR_ERR(ctx); 4837 4838 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4839 4840 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4841 sattr->ia_mode &= ~current_umask(); 4842 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4843 if (IS_ERR(state)) { 4844 status = PTR_ERR(state); 4845 goto out; 4846 } 4847 out: 4848 nfs4_label_release_security(ilabel); 4849 put_nfs_open_context(ctx); 4850 return status; 4851 } 4852 4853 static int 4854 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4855 { 4856 struct nfs_server *server = NFS_SERVER(dir); 4857 struct nfs_removeargs args = { 4858 .fh = NFS_FH(dir), 4859 .name = *name, 4860 }; 4861 struct nfs_removeres res = { 4862 .server = server, 4863 }; 4864 struct rpc_message msg = { 4865 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4866 .rpc_argp = &args, 4867 .rpc_resp = &res, 4868 }; 4869 unsigned long timestamp = jiffies; 4870 int status; 4871 4872 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4873 if (status == 0) { 4874 spin_lock(&dir->i_lock); 4875 /* Removing a directory decrements nlink in the parent */ 4876 if (ftype == NF4DIR && dir->i_nlink > 2) 4877 nfs4_dec_nlink_locked(dir); 4878 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4879 NFS_INO_INVALID_DATA); 4880 spin_unlock(&dir->i_lock); 4881 } 4882 return status; 4883 } 4884 4885 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4886 { 4887 struct nfs4_exception exception = { 4888 .interruptible = true, 4889 }; 4890 struct inode *inode = d_inode(dentry); 4891 int err; 4892 4893 if (inode) { 4894 if (inode->i_nlink == 1) 4895 nfs4_inode_return_delegation(inode); 4896 else 4897 nfs4_inode_make_writeable(inode); 4898 } 4899 do { 4900 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4901 trace_nfs4_remove(dir, &dentry->d_name, err); 4902 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4903 &exception); 4904 } while (exception.retry); 4905 return err; 4906 } 4907 4908 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4909 { 4910 struct nfs4_exception exception = { 4911 .interruptible = true, 4912 }; 4913 int err; 4914 4915 do { 4916 err = _nfs4_proc_remove(dir, name, NF4DIR); 4917 trace_nfs4_remove(dir, name, err); 4918 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4919 &exception); 4920 } while (exception.retry); 4921 return err; 4922 } 4923 4924 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4925 struct dentry *dentry, 4926 struct inode *inode) 4927 { 4928 struct nfs_removeargs *args = msg->rpc_argp; 4929 struct nfs_removeres *res = msg->rpc_resp; 4930 4931 res->server = NFS_SB(dentry->d_sb); 4932 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4933 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4934 4935 nfs_fattr_init(res->dir_attr); 4936 4937 if (inode) { 4938 nfs4_inode_return_delegation(inode); 4939 nfs_d_prune_case_insensitive_aliases(inode); 4940 } 4941 } 4942 4943 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4944 { 4945 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4946 &data->args.seq_args, 4947 &data->res.seq_res, 4948 task); 4949 } 4950 4951 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4952 { 4953 struct nfs_unlinkdata *data = task->tk_calldata; 4954 struct nfs_removeres *res = &data->res; 4955 4956 if (!nfs4_sequence_done(task, &res->seq_res)) 4957 return 0; 4958 if (nfs4_async_handle_error(task, res->server, NULL, 4959 &data->timeout) == -EAGAIN) 4960 return 0; 4961 if (task->tk_status == 0) 4962 nfs4_update_changeattr(dir, &res->cinfo, 4963 res->dir_attr->time_start, 4964 NFS_INO_INVALID_DATA); 4965 return 1; 4966 } 4967 4968 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4969 struct dentry *old_dentry, 4970 struct dentry *new_dentry) 4971 { 4972 struct nfs_renameargs *arg = msg->rpc_argp; 4973 struct nfs_renameres *res = msg->rpc_resp; 4974 struct inode *old_inode = d_inode(old_dentry); 4975 struct inode *new_inode = d_inode(new_dentry); 4976 4977 if (old_inode) 4978 nfs4_inode_make_writeable(old_inode); 4979 if (new_inode) 4980 nfs4_inode_return_delegation(new_inode); 4981 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4982 res->server = NFS_SB(old_dentry->d_sb); 4983 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4984 } 4985 4986 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4987 { 4988 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4989 &data->args.seq_args, 4990 &data->res.seq_res, 4991 task); 4992 } 4993 4994 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4995 struct inode *new_dir) 4996 { 4997 struct nfs_renamedata *data = task->tk_calldata; 4998 struct nfs_renameres *res = &data->res; 4999 5000 if (!nfs4_sequence_done(task, &res->seq_res)) 5001 return 0; 5002 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 5003 return 0; 5004 5005 if (task->tk_status == 0) { 5006 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 5007 if (new_dir != old_dir) { 5008 /* Note: If we moved a directory, nlink will change */ 5009 nfs4_update_changeattr(old_dir, &res->old_cinfo, 5010 res->old_fattr->time_start, 5011 NFS_INO_INVALID_NLINK | 5012 NFS_INO_INVALID_DATA); 5013 nfs4_update_changeattr(new_dir, &res->new_cinfo, 5014 res->new_fattr->time_start, 5015 NFS_INO_INVALID_NLINK | 5016 NFS_INO_INVALID_DATA); 5017 } else 5018 nfs4_update_changeattr(old_dir, &res->old_cinfo, 5019 res->old_fattr->time_start, 5020 NFS_INO_INVALID_DATA); 5021 } 5022 return 1; 5023 } 5024 5025 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 5026 { 5027 struct nfs_server *server = NFS_SERVER(inode); 5028 __u32 bitmask[NFS4_BITMASK_SZ]; 5029 struct nfs4_link_arg arg = { 5030 .fh = NFS_FH(inode), 5031 .dir_fh = NFS_FH(dir), 5032 .name = name, 5033 .bitmask = bitmask, 5034 }; 5035 struct nfs4_link_res res = { 5036 .server = server, 5037 }; 5038 struct rpc_message msg = { 5039 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 5040 .rpc_argp = &arg, 5041 .rpc_resp = &res, 5042 }; 5043 int status = -ENOMEM; 5044 5045 res.fattr = nfs_alloc_fattr_with_label(server); 5046 if (res.fattr == NULL) 5047 goto out; 5048 5049 nfs4_inode_make_writeable(inode); 5050 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), 5051 inode, 5052 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME); 5053 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 5054 if (!status) { 5055 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 5056 NFS_INO_INVALID_DATA); 5057 nfs4_inc_nlink(inode); 5058 status = nfs_post_op_update_inode(inode, res.fattr); 5059 if (!status) 5060 nfs_setsecurity(inode, res.fattr); 5061 } 5062 5063 out: 5064 nfs_free_fattr(res.fattr); 5065 return status; 5066 } 5067 5068 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 5069 { 5070 struct nfs4_exception exception = { 5071 .interruptible = true, 5072 }; 5073 int err; 5074 do { 5075 err = nfs4_handle_exception(NFS_SERVER(inode), 5076 _nfs4_proc_link(inode, dir, name), 5077 &exception); 5078 } while (exception.retry); 5079 return err; 5080 } 5081 5082 struct nfs4_createdata { 5083 struct rpc_message msg; 5084 struct nfs4_create_arg arg; 5085 struct nfs4_create_res res; 5086 struct nfs_fh fh; 5087 struct nfs_fattr fattr; 5088 }; 5089 5090 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 5091 const struct qstr *name, struct iattr *sattr, u32 ftype) 5092 { 5093 struct nfs4_createdata *data; 5094 5095 data = kzalloc(sizeof(*data), GFP_KERNEL); 5096 if (data != NULL) { 5097 struct nfs_server *server = NFS_SERVER(dir); 5098 5099 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 5100 if (IS_ERR(data->fattr.label)) 5101 goto out_free; 5102 5103 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 5104 data->msg.rpc_argp = &data->arg; 5105 data->msg.rpc_resp = &data->res; 5106 data->arg.dir_fh = NFS_FH(dir); 5107 data->arg.server = server; 5108 data->arg.name = name; 5109 data->arg.attrs = sattr; 5110 data->arg.ftype = ftype; 5111 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 5112 data->arg.umask = current_umask(); 5113 data->res.server = server; 5114 data->res.fh = &data->fh; 5115 data->res.fattr = &data->fattr; 5116 nfs_fattr_init(data->res.fattr); 5117 } 5118 return data; 5119 out_free: 5120 kfree(data); 5121 return NULL; 5122 } 5123 5124 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 5125 { 5126 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 5127 &data->arg.seq_args, &data->res.seq_res, 1); 5128 if (status == 0) { 5129 spin_lock(&dir->i_lock); 5130 /* Creating a directory bumps nlink in the parent */ 5131 if (data->arg.ftype == NF4DIR) 5132 nfs4_inc_nlink_locked(dir); 5133 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 5134 data->res.fattr->time_start, 5135 NFS_INO_INVALID_DATA); 5136 spin_unlock(&dir->i_lock); 5137 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5138 } 5139 return status; 5140 } 5141 5142 static void nfs4_free_createdata(struct nfs4_createdata *data) 5143 { 5144 nfs4_label_free(data->fattr.label); 5145 kfree(data); 5146 } 5147 5148 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5149 struct folio *folio, unsigned int len, struct iattr *sattr, 5150 struct nfs4_label *label) 5151 { 5152 struct page *page = &folio->page; 5153 struct nfs4_createdata *data; 5154 int status = -ENAMETOOLONG; 5155 5156 if (len > NFS4_MAXPATHLEN) 5157 goto out; 5158 5159 status = -ENOMEM; 5160 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5161 if (data == NULL) 5162 goto out; 5163 5164 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5165 data->arg.u.symlink.pages = &page; 5166 data->arg.u.symlink.len = len; 5167 data->arg.label = label; 5168 5169 status = nfs4_do_create(dir, dentry, data); 5170 5171 nfs4_free_createdata(data); 5172 out: 5173 return status; 5174 } 5175 5176 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5177 struct folio *folio, unsigned int len, struct iattr *sattr) 5178 { 5179 struct nfs4_exception exception = { 5180 .interruptible = true, 5181 }; 5182 struct nfs4_label l, *label; 5183 int err; 5184 5185 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5186 5187 do { 5188 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label); 5189 trace_nfs4_symlink(dir, &dentry->d_name, err); 5190 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5191 &exception); 5192 } while (exception.retry); 5193 5194 nfs4_label_release_security(label); 5195 return err; 5196 } 5197 5198 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5199 struct iattr *sattr, struct nfs4_label *label) 5200 { 5201 struct nfs4_createdata *data; 5202 int status = -ENOMEM; 5203 5204 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5205 if (data == NULL) 5206 goto out; 5207 5208 data->arg.label = label; 5209 status = nfs4_do_create(dir, dentry, data); 5210 5211 nfs4_free_createdata(data); 5212 out: 5213 return status; 5214 } 5215 5216 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5217 struct iattr *sattr) 5218 { 5219 struct nfs_server *server = NFS_SERVER(dir); 5220 struct nfs4_exception exception = { 5221 .interruptible = true, 5222 }; 5223 struct nfs4_label l, *label; 5224 int err; 5225 5226 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5227 5228 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5229 sattr->ia_mode &= ~current_umask(); 5230 do { 5231 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5232 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5233 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5234 &exception); 5235 } while (exception.retry); 5236 nfs4_label_release_security(label); 5237 5238 return err; 5239 } 5240 5241 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5242 struct nfs_readdir_res *nr_res) 5243 { 5244 struct inode *dir = d_inode(nr_arg->dentry); 5245 struct nfs_server *server = NFS_SERVER(dir); 5246 struct nfs4_readdir_arg args = { 5247 .fh = NFS_FH(dir), 5248 .pages = nr_arg->pages, 5249 .pgbase = 0, 5250 .count = nr_arg->page_len, 5251 .plus = nr_arg->plus, 5252 }; 5253 struct nfs4_readdir_res res; 5254 struct rpc_message msg = { 5255 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5256 .rpc_argp = &args, 5257 .rpc_resp = &res, 5258 .rpc_cred = nr_arg->cred, 5259 }; 5260 int status; 5261 5262 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5263 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5264 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5265 args.bitmask = server->attr_bitmask_nl; 5266 else 5267 args.bitmask = server->attr_bitmask; 5268 5269 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5270 res.pgbase = args.pgbase; 5271 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5272 &res.seq_res, 0); 5273 if (status >= 0) { 5274 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5275 status += args.pgbase; 5276 } 5277 5278 nfs_invalidate_atime(dir); 5279 5280 dprintk("%s: returns %d\n", __func__, status); 5281 return status; 5282 } 5283 5284 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5285 struct nfs_readdir_res *res) 5286 { 5287 struct nfs4_exception exception = { 5288 .interruptible = true, 5289 }; 5290 int err; 5291 do { 5292 err = _nfs4_proc_readdir(arg, res); 5293 trace_nfs4_readdir(d_inode(arg->dentry), err); 5294 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5295 err, &exception); 5296 } while (exception.retry); 5297 return err; 5298 } 5299 5300 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5301 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5302 { 5303 struct nfs4_createdata *data; 5304 int mode = sattr->ia_mode; 5305 int status = -ENOMEM; 5306 5307 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5308 if (data == NULL) 5309 goto out; 5310 5311 if (S_ISFIFO(mode)) 5312 data->arg.ftype = NF4FIFO; 5313 else if (S_ISBLK(mode)) { 5314 data->arg.ftype = NF4BLK; 5315 data->arg.u.device.specdata1 = MAJOR(rdev); 5316 data->arg.u.device.specdata2 = MINOR(rdev); 5317 } 5318 else if (S_ISCHR(mode)) { 5319 data->arg.ftype = NF4CHR; 5320 data->arg.u.device.specdata1 = MAJOR(rdev); 5321 data->arg.u.device.specdata2 = MINOR(rdev); 5322 } else if (!S_ISSOCK(mode)) { 5323 status = -EINVAL; 5324 goto out_free; 5325 } 5326 5327 data->arg.label = label; 5328 status = nfs4_do_create(dir, dentry, data); 5329 out_free: 5330 nfs4_free_createdata(data); 5331 out: 5332 return status; 5333 } 5334 5335 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5336 struct iattr *sattr, dev_t rdev) 5337 { 5338 struct nfs_server *server = NFS_SERVER(dir); 5339 struct nfs4_exception exception = { 5340 .interruptible = true, 5341 }; 5342 struct nfs4_label l, *label; 5343 int err; 5344 5345 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5346 5347 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5348 sattr->ia_mode &= ~current_umask(); 5349 do { 5350 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5351 trace_nfs4_mknod(dir, &dentry->d_name, err); 5352 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5353 &exception); 5354 } while (exception.retry); 5355 5356 nfs4_label_release_security(label); 5357 5358 return err; 5359 } 5360 5361 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5362 struct nfs_fsstat *fsstat) 5363 { 5364 struct nfs4_statfs_arg args = { 5365 .fh = fhandle, 5366 .bitmask = server->attr_bitmask, 5367 }; 5368 struct nfs4_statfs_res res = { 5369 .fsstat = fsstat, 5370 }; 5371 struct rpc_message msg = { 5372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5373 .rpc_argp = &args, 5374 .rpc_resp = &res, 5375 }; 5376 5377 nfs_fattr_init(fsstat->fattr); 5378 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5379 } 5380 5381 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5382 { 5383 struct nfs4_exception exception = { 5384 .interruptible = true, 5385 }; 5386 int err; 5387 do { 5388 err = nfs4_handle_exception(server, 5389 _nfs4_proc_statfs(server, fhandle, fsstat), 5390 &exception); 5391 } while (exception.retry); 5392 return err; 5393 } 5394 5395 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5396 struct nfs_fsinfo *fsinfo) 5397 { 5398 struct nfs4_fsinfo_arg args = { 5399 .fh = fhandle, 5400 .bitmask = server->attr_bitmask, 5401 }; 5402 struct nfs4_fsinfo_res res = { 5403 .fsinfo = fsinfo, 5404 }; 5405 struct rpc_message msg = { 5406 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5407 .rpc_argp = &args, 5408 .rpc_resp = &res, 5409 }; 5410 5411 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5412 } 5413 5414 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5415 { 5416 struct nfs4_exception exception = { 5417 .interruptible = true, 5418 }; 5419 int err; 5420 5421 do { 5422 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5423 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5424 if (err == 0) { 5425 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5426 break; 5427 } 5428 err = nfs4_handle_exception(server, err, &exception); 5429 } while (exception.retry); 5430 return err; 5431 } 5432 5433 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5434 { 5435 int error; 5436 5437 nfs_fattr_init(fsinfo->fattr); 5438 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5439 if (error == 0) { 5440 /* block layout checks this! */ 5441 server->pnfs_blksize = fsinfo->blksize; 5442 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5443 } 5444 5445 return error; 5446 } 5447 5448 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5449 struct nfs_pathconf *pathconf) 5450 { 5451 struct nfs4_pathconf_arg args = { 5452 .fh = fhandle, 5453 .bitmask = server->attr_bitmask, 5454 }; 5455 struct nfs4_pathconf_res res = { 5456 .pathconf = pathconf, 5457 }; 5458 struct rpc_message msg = { 5459 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5460 .rpc_argp = &args, 5461 .rpc_resp = &res, 5462 }; 5463 5464 /* None of the pathconf attributes are mandatory to implement */ 5465 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5466 memset(pathconf, 0, sizeof(*pathconf)); 5467 return 0; 5468 } 5469 5470 nfs_fattr_init(pathconf->fattr); 5471 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5472 } 5473 5474 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5475 struct nfs_pathconf *pathconf) 5476 { 5477 struct nfs4_exception exception = { 5478 .interruptible = true, 5479 }; 5480 int err; 5481 5482 do { 5483 err = nfs4_handle_exception(server, 5484 _nfs4_proc_pathconf(server, fhandle, pathconf), 5485 &exception); 5486 } while (exception.retry); 5487 return err; 5488 } 5489 5490 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5491 const struct nfs_open_context *ctx, 5492 const struct nfs_lock_context *l_ctx, 5493 fmode_t fmode) 5494 { 5495 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5496 } 5497 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5498 5499 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5500 const struct nfs_open_context *ctx, 5501 const struct nfs_lock_context *l_ctx, 5502 fmode_t fmode) 5503 { 5504 nfs4_stateid _current_stateid; 5505 5506 /* If the current stateid represents a lost lock, then exit */ 5507 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5508 return true; 5509 return nfs4_stateid_match(stateid, &_current_stateid); 5510 } 5511 5512 static bool nfs4_error_stateid_expired(int err) 5513 { 5514 switch (err) { 5515 case -NFS4ERR_DELEG_REVOKED: 5516 case -NFS4ERR_ADMIN_REVOKED: 5517 case -NFS4ERR_BAD_STATEID: 5518 case -NFS4ERR_STALE_STATEID: 5519 case -NFS4ERR_OLD_STATEID: 5520 case -NFS4ERR_OPENMODE: 5521 case -NFS4ERR_EXPIRED: 5522 return true; 5523 } 5524 return false; 5525 } 5526 5527 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5528 { 5529 struct nfs_server *server = NFS_SERVER(hdr->inode); 5530 5531 trace_nfs4_read(hdr, task->tk_status); 5532 if (task->tk_status < 0) { 5533 struct nfs4_exception exception = { 5534 .inode = hdr->inode, 5535 .state = hdr->args.context->state, 5536 .stateid = &hdr->args.stateid, 5537 }; 5538 task->tk_status = nfs4_async_handle_exception(task, 5539 server, task->tk_status, &exception); 5540 if (exception.retry) { 5541 rpc_restart_call_prepare(task); 5542 return -EAGAIN; 5543 } 5544 } 5545 5546 if (task->tk_status > 0) 5547 renew_lease(server, hdr->timestamp); 5548 return 0; 5549 } 5550 5551 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5552 struct nfs_pgio_args *args) 5553 { 5554 5555 if (!nfs4_error_stateid_expired(task->tk_status) || 5556 nfs4_stateid_is_current(&args->stateid, 5557 args->context, 5558 args->lock_context, 5559 FMODE_READ)) 5560 return false; 5561 rpc_restart_call_prepare(task); 5562 return true; 5563 } 5564 5565 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5566 struct nfs_pgio_header *hdr) 5567 { 5568 struct nfs_server *server = NFS_SERVER(hdr->inode); 5569 struct rpc_message *msg = &task->tk_msg; 5570 5571 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5572 task->tk_status == -ENOTSUPP) { 5573 server->caps &= ~NFS_CAP_READ_PLUS; 5574 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5575 rpc_restart_call_prepare(task); 5576 return true; 5577 } 5578 return false; 5579 } 5580 5581 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5582 { 5583 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5584 return -EAGAIN; 5585 if (nfs4_read_stateid_changed(task, &hdr->args)) 5586 return -EAGAIN; 5587 if (nfs4_read_plus_not_supported(task, hdr)) 5588 return -EAGAIN; 5589 if (task->tk_status > 0) 5590 nfs_invalidate_atime(hdr->inode); 5591 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5592 nfs4_read_done_cb(task, hdr); 5593 } 5594 5595 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5596 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5597 struct rpc_message *msg) 5598 { 5599 /* Note: We don't use READ_PLUS with pNFS yet */ 5600 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5601 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5602 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5603 } 5604 return false; 5605 } 5606 #else 5607 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5608 struct rpc_message *msg) 5609 { 5610 return false; 5611 } 5612 #endif /* CONFIG_NFS_V4_2 */ 5613 5614 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5615 struct rpc_message *msg) 5616 { 5617 hdr->timestamp = jiffies; 5618 if (!hdr->pgio_done_cb) 5619 hdr->pgio_done_cb = nfs4_read_done_cb; 5620 if (!nfs42_read_plus_support(hdr, msg)) 5621 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5622 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5623 } 5624 5625 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5626 struct nfs_pgio_header *hdr) 5627 { 5628 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5629 &hdr->args.seq_args, 5630 &hdr->res.seq_res, 5631 task)) 5632 return 0; 5633 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5634 hdr->args.lock_context, 5635 hdr->rw_mode) == -EIO) 5636 return -EIO; 5637 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5638 return -EIO; 5639 return 0; 5640 } 5641 5642 static int nfs4_write_done_cb(struct rpc_task *task, 5643 struct nfs_pgio_header *hdr) 5644 { 5645 struct inode *inode = hdr->inode; 5646 5647 trace_nfs4_write(hdr, task->tk_status); 5648 if (task->tk_status < 0) { 5649 struct nfs4_exception exception = { 5650 .inode = hdr->inode, 5651 .state = hdr->args.context->state, 5652 .stateid = &hdr->args.stateid, 5653 }; 5654 task->tk_status = nfs4_async_handle_exception(task, 5655 NFS_SERVER(inode), task->tk_status, 5656 &exception); 5657 if (exception.retry) { 5658 rpc_restart_call_prepare(task); 5659 return -EAGAIN; 5660 } 5661 } 5662 if (task->tk_status >= 0) { 5663 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5664 nfs_writeback_update_inode(hdr); 5665 } 5666 return 0; 5667 } 5668 5669 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5670 struct nfs_pgio_args *args) 5671 { 5672 5673 if (!nfs4_error_stateid_expired(task->tk_status) || 5674 nfs4_stateid_is_current(&args->stateid, 5675 args->context, 5676 args->lock_context, 5677 FMODE_WRITE)) 5678 return false; 5679 rpc_restart_call_prepare(task); 5680 return true; 5681 } 5682 5683 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5684 { 5685 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5686 return -EAGAIN; 5687 if (nfs4_write_stateid_changed(task, &hdr->args)) 5688 return -EAGAIN; 5689 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5690 nfs4_write_done_cb(task, hdr); 5691 } 5692 5693 static 5694 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5695 { 5696 /* Don't request attributes for pNFS or O_DIRECT writes */ 5697 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5698 return false; 5699 /* Otherwise, request attributes if and only if we don't hold 5700 * a delegation 5701 */ 5702 return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0; 5703 } 5704 5705 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5706 struct inode *inode, unsigned long cache_validity) 5707 { 5708 struct nfs_server *server = NFS_SERVER(inode); 5709 unsigned int i; 5710 5711 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5712 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5713 5714 if (cache_validity & NFS_INO_INVALID_CHANGE) 5715 bitmask[0] |= FATTR4_WORD0_CHANGE; 5716 if (cache_validity & NFS_INO_INVALID_ATIME) 5717 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5718 if (cache_validity & NFS_INO_INVALID_MODE) 5719 bitmask[1] |= FATTR4_WORD1_MODE; 5720 if (cache_validity & NFS_INO_INVALID_OTHER) 5721 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5722 if (cache_validity & NFS_INO_INVALID_NLINK) 5723 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5724 if (cache_validity & NFS_INO_INVALID_CTIME) 5725 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5726 if (cache_validity & NFS_INO_INVALID_MTIME) 5727 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5728 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5729 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5730 5731 if (cache_validity & NFS_INO_INVALID_SIZE) 5732 bitmask[0] |= FATTR4_WORD0_SIZE; 5733 5734 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5735 bitmask[i] &= server->attr_bitmask[i]; 5736 } 5737 5738 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5739 struct rpc_message *msg, 5740 struct rpc_clnt **clnt) 5741 { 5742 struct nfs_server *server = NFS_SERVER(hdr->inode); 5743 5744 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5745 hdr->args.bitmask = NULL; 5746 hdr->res.fattr = NULL; 5747 } else { 5748 nfs4_bitmask_set(hdr->args.bitmask_store, 5749 server->cache_consistency_bitmask, 5750 hdr->inode, NFS_INO_INVALID_BLOCKS); 5751 hdr->args.bitmask = hdr->args.bitmask_store; 5752 } 5753 5754 if (!hdr->pgio_done_cb) 5755 hdr->pgio_done_cb = nfs4_write_done_cb; 5756 hdr->res.server = server; 5757 hdr->timestamp = jiffies; 5758 5759 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5760 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5761 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr); 5762 } 5763 5764 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5765 { 5766 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5767 &data->args.seq_args, 5768 &data->res.seq_res, 5769 task); 5770 } 5771 5772 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5773 { 5774 struct inode *inode = data->inode; 5775 5776 trace_nfs4_commit(data, task->tk_status); 5777 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5778 NULL, NULL) == -EAGAIN) { 5779 rpc_restart_call_prepare(task); 5780 return -EAGAIN; 5781 } 5782 return 0; 5783 } 5784 5785 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5786 { 5787 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5788 return -EAGAIN; 5789 return data->commit_done_cb(task, data); 5790 } 5791 5792 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5793 struct rpc_clnt **clnt) 5794 { 5795 struct nfs_server *server = NFS_SERVER(data->inode); 5796 5797 if (data->commit_done_cb == NULL) 5798 data->commit_done_cb = nfs4_commit_done_cb; 5799 data->res.server = server; 5800 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5801 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5802 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client, 5803 NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5804 } 5805 5806 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5807 struct nfs_commitres *res) 5808 { 5809 struct inode *dst_inode = file_inode(dst); 5810 struct nfs_server *server = NFS_SERVER(dst_inode); 5811 struct rpc_message msg = { 5812 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5813 .rpc_argp = args, 5814 .rpc_resp = res, 5815 }; 5816 5817 args->fh = NFS_FH(dst_inode); 5818 return nfs4_call_sync(server->client, server, &msg, 5819 &args->seq_args, &res->seq_res, 1); 5820 } 5821 5822 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5823 { 5824 struct nfs_commitargs args = { 5825 .offset = offset, 5826 .count = count, 5827 }; 5828 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5829 struct nfs4_exception exception = { }; 5830 int status; 5831 5832 do { 5833 status = _nfs4_proc_commit(dst, &args, res); 5834 status = nfs4_handle_exception(dst_server, status, &exception); 5835 } while (exception.retry); 5836 5837 return status; 5838 } 5839 5840 struct nfs4_renewdata { 5841 struct nfs_client *client; 5842 unsigned long timestamp; 5843 }; 5844 5845 /* 5846 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5847 * standalone procedure for queueing an asynchronous RENEW. 5848 */ 5849 static void nfs4_renew_release(void *calldata) 5850 { 5851 struct nfs4_renewdata *data = calldata; 5852 struct nfs_client *clp = data->client; 5853 5854 if (refcount_read(&clp->cl_count) > 1) 5855 nfs4_schedule_state_renewal(clp); 5856 nfs_put_client(clp); 5857 kfree(data); 5858 } 5859 5860 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5861 { 5862 struct nfs4_renewdata *data = calldata; 5863 struct nfs_client *clp = data->client; 5864 unsigned long timestamp = data->timestamp; 5865 5866 trace_nfs4_renew_async(clp, task->tk_status); 5867 switch (task->tk_status) { 5868 case 0: 5869 break; 5870 case -NFS4ERR_LEASE_MOVED: 5871 nfs4_schedule_lease_moved_recovery(clp); 5872 break; 5873 default: 5874 /* Unless we're shutting down, schedule state recovery! */ 5875 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5876 return; 5877 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5878 nfs4_schedule_lease_recovery(clp); 5879 return; 5880 } 5881 nfs4_schedule_path_down_recovery(clp); 5882 } 5883 do_renew_lease(clp, timestamp); 5884 } 5885 5886 static const struct rpc_call_ops nfs4_renew_ops = { 5887 .rpc_call_done = nfs4_renew_done, 5888 .rpc_release = nfs4_renew_release, 5889 }; 5890 5891 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5892 { 5893 struct rpc_message msg = { 5894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5895 .rpc_argp = clp, 5896 .rpc_cred = cred, 5897 }; 5898 struct nfs4_renewdata *data; 5899 5900 if (renew_flags == 0) 5901 return 0; 5902 if (!refcount_inc_not_zero(&clp->cl_count)) 5903 return -EIO; 5904 data = kmalloc(sizeof(*data), GFP_NOFS); 5905 if (data == NULL) { 5906 nfs_put_client(clp); 5907 return -ENOMEM; 5908 } 5909 data->client = clp; 5910 data->timestamp = jiffies; 5911 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5912 &nfs4_renew_ops, data); 5913 } 5914 5915 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5916 { 5917 struct rpc_message msg = { 5918 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5919 .rpc_argp = clp, 5920 .rpc_cred = cred, 5921 }; 5922 unsigned long now = jiffies; 5923 int status; 5924 5925 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5926 if (status < 0) 5927 return status; 5928 do_renew_lease(clp, now); 5929 return 0; 5930 } 5931 5932 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5933 enum nfs4_acl_type type) 5934 { 5935 switch (type) { 5936 default: 5937 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5938 case NFS4ACL_DACL: 5939 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5940 case NFS4ACL_SACL: 5941 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5942 } 5943 } 5944 5945 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5946 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5947 * the stack. 5948 */ 5949 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5950 5951 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5952 struct page **pages) 5953 { 5954 struct page *newpage, **spages; 5955 int rc = 0; 5956 size_t len; 5957 spages = pages; 5958 5959 do { 5960 len = min_t(size_t, PAGE_SIZE, buflen); 5961 newpage = alloc_page(GFP_KERNEL); 5962 5963 if (newpage == NULL) 5964 goto unwind; 5965 memcpy(page_address(newpage), buf, len); 5966 buf += len; 5967 buflen -= len; 5968 *pages++ = newpage; 5969 rc++; 5970 } while (buflen != 0); 5971 5972 return rc; 5973 5974 unwind: 5975 for(; rc > 0; rc--) 5976 __free_page(spages[rc-1]); 5977 return -ENOMEM; 5978 } 5979 5980 struct nfs4_cached_acl { 5981 enum nfs4_acl_type type; 5982 int cached; 5983 size_t len; 5984 char data[]; 5985 }; 5986 5987 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5988 { 5989 struct nfs_inode *nfsi = NFS_I(inode); 5990 5991 spin_lock(&inode->i_lock); 5992 kfree(nfsi->nfs4_acl); 5993 nfsi->nfs4_acl = acl; 5994 spin_unlock(&inode->i_lock); 5995 } 5996 5997 static void nfs4_zap_acl_attr(struct inode *inode) 5998 { 5999 nfs4_set_cached_acl(inode, NULL); 6000 } 6001 6002 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 6003 size_t buflen, enum nfs4_acl_type type) 6004 { 6005 struct nfs_inode *nfsi = NFS_I(inode); 6006 struct nfs4_cached_acl *acl; 6007 int ret = -ENOENT; 6008 6009 spin_lock(&inode->i_lock); 6010 acl = nfsi->nfs4_acl; 6011 if (acl == NULL) 6012 goto out; 6013 if (acl->type != type) 6014 goto out; 6015 if (buf == NULL) /* user is just asking for length */ 6016 goto out_len; 6017 if (acl->cached == 0) 6018 goto out; 6019 ret = -ERANGE; /* see getxattr(2) man page */ 6020 if (acl->len > buflen) 6021 goto out; 6022 memcpy(buf, acl->data, acl->len); 6023 out_len: 6024 ret = acl->len; 6025 out: 6026 spin_unlock(&inode->i_lock); 6027 return ret; 6028 } 6029 6030 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 6031 size_t pgbase, size_t acl_len, 6032 enum nfs4_acl_type type) 6033 { 6034 struct nfs4_cached_acl *acl; 6035 size_t buflen = sizeof(*acl) + acl_len; 6036 6037 if (buflen <= PAGE_SIZE) { 6038 acl = kmalloc(buflen, GFP_KERNEL); 6039 if (acl == NULL) 6040 goto out; 6041 acl->cached = 1; 6042 _copy_from_pages(acl->data, pages, pgbase, acl_len); 6043 } else { 6044 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 6045 if (acl == NULL) 6046 goto out; 6047 acl->cached = 0; 6048 } 6049 acl->type = type; 6050 acl->len = acl_len; 6051 out: 6052 nfs4_set_cached_acl(inode, acl); 6053 } 6054 6055 /* 6056 * The getxattr API returns the required buffer length when called with a 6057 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 6058 * the required buf. On a NULL buf, we send a page of data to the server 6059 * guessing that the ACL request can be serviced by a page. If so, we cache 6060 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 6061 * the cache. If not so, we throw away the page, and cache the required 6062 * length. The next getxattr call will then produce another round trip to 6063 * the server, this time with the input buf of the required size. 6064 */ 6065 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 6066 size_t buflen, enum nfs4_acl_type type) 6067 { 6068 struct page **pages; 6069 struct nfs_getaclargs args = { 6070 .fh = NFS_FH(inode), 6071 .acl_type = type, 6072 .acl_len = buflen, 6073 }; 6074 struct nfs_getaclres res = { 6075 .acl_type = type, 6076 .acl_len = buflen, 6077 }; 6078 struct rpc_message msg = { 6079 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 6080 .rpc_argp = &args, 6081 .rpc_resp = &res, 6082 }; 6083 unsigned int npages; 6084 int ret = -ENOMEM, i; 6085 struct nfs_server *server = NFS_SERVER(inode); 6086 6087 if (buflen == 0) 6088 buflen = server->rsize; 6089 6090 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 6091 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 6092 if (!pages) 6093 return -ENOMEM; 6094 6095 args.acl_pages = pages; 6096 6097 for (i = 0; i < npages; i++) { 6098 pages[i] = alloc_page(GFP_KERNEL); 6099 if (!pages[i]) 6100 goto out_free; 6101 } 6102 6103 /* for decoding across pages */ 6104 res.acl_scratch = alloc_page(GFP_KERNEL); 6105 if (!res.acl_scratch) 6106 goto out_free; 6107 6108 args.acl_len = npages * PAGE_SIZE; 6109 6110 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 6111 __func__, buf, buflen, npages, args.acl_len); 6112 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 6113 &msg, &args.seq_args, &res.seq_res, 0); 6114 if (ret) 6115 goto out_free; 6116 6117 /* Handle the case where the passed-in buffer is too short */ 6118 if (res.acl_flags & NFS4_ACL_TRUNC) { 6119 /* Did the user only issue a request for the acl length? */ 6120 if (buf == NULL) 6121 goto out_ok; 6122 ret = -ERANGE; 6123 goto out_free; 6124 } 6125 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 6126 type); 6127 if (buf) { 6128 if (res.acl_len > buflen) { 6129 ret = -ERANGE; 6130 goto out_free; 6131 } 6132 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 6133 } 6134 out_ok: 6135 ret = res.acl_len; 6136 out_free: 6137 while (--i >= 0) 6138 __free_page(pages[i]); 6139 if (res.acl_scratch) 6140 __free_page(res.acl_scratch); 6141 kfree(pages); 6142 return ret; 6143 } 6144 6145 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6146 size_t buflen, enum nfs4_acl_type type) 6147 { 6148 struct nfs4_exception exception = { 6149 .interruptible = true, 6150 }; 6151 ssize_t ret; 6152 do { 6153 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6154 trace_nfs4_get_acl(inode, ret); 6155 if (ret >= 0) 6156 break; 6157 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6158 } while (exception.retry); 6159 return ret; 6160 } 6161 6162 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6163 enum nfs4_acl_type type) 6164 { 6165 struct nfs_server *server = NFS_SERVER(inode); 6166 int ret; 6167 6168 if (!nfs4_server_supports_acls(server, type)) 6169 return -EOPNOTSUPP; 6170 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6171 if (ret < 0) 6172 return ret; 6173 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6174 nfs_zap_acl_cache(inode); 6175 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6176 if (ret != -ENOENT) 6177 /* -ENOENT is returned if there is no ACL or if there is an ACL 6178 * but no cached acl data, just the acl length */ 6179 return ret; 6180 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6181 } 6182 6183 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6184 size_t buflen, enum nfs4_acl_type type) 6185 { 6186 struct nfs_server *server = NFS_SERVER(inode); 6187 struct page *pages[NFS4ACL_MAXPAGES]; 6188 struct nfs_setaclargs arg = { 6189 .fh = NFS_FH(inode), 6190 .acl_type = type, 6191 .acl_len = buflen, 6192 .acl_pages = pages, 6193 }; 6194 struct nfs_setaclres res; 6195 struct rpc_message msg = { 6196 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6197 .rpc_argp = &arg, 6198 .rpc_resp = &res, 6199 }; 6200 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6201 int ret, i; 6202 6203 /* You can't remove system.nfs4_acl: */ 6204 if (buflen == 0) 6205 return -EINVAL; 6206 if (!nfs4_server_supports_acls(server, type)) 6207 return -EOPNOTSUPP; 6208 if (npages > ARRAY_SIZE(pages)) 6209 return -ERANGE; 6210 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6211 if (i < 0) 6212 return i; 6213 nfs4_inode_make_writeable(inode); 6214 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6215 6216 /* 6217 * Free each page after tx, so the only ref left is 6218 * held by the network stack 6219 */ 6220 for (; i > 0; i--) 6221 put_page(pages[i-1]); 6222 6223 /* 6224 * Acl update can result in inode attribute update. 6225 * so mark the attribute cache invalid. 6226 */ 6227 spin_lock(&inode->i_lock); 6228 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6229 NFS_INO_INVALID_CTIME | 6230 NFS_INO_REVAL_FORCED); 6231 spin_unlock(&inode->i_lock); 6232 nfs_access_zap_cache(inode); 6233 nfs_zap_acl_cache(inode); 6234 return ret; 6235 } 6236 6237 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6238 size_t buflen, enum nfs4_acl_type type) 6239 { 6240 struct nfs4_exception exception = { }; 6241 int err; 6242 do { 6243 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6244 trace_nfs4_set_acl(inode, err); 6245 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6246 /* 6247 * no need to retry since the kernel 6248 * isn't involved in encoding the ACEs. 6249 */ 6250 err = -EINVAL; 6251 break; 6252 } 6253 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6254 &exception); 6255 } while (exception.retry); 6256 return err; 6257 } 6258 6259 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6260 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6261 size_t buflen) 6262 { 6263 struct nfs_server *server = NFS_SERVER(inode); 6264 struct nfs4_label label = {0, 0, buflen, buf}; 6265 6266 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6267 struct nfs_fattr fattr = { 6268 .label = &label, 6269 }; 6270 struct nfs4_getattr_arg arg = { 6271 .fh = NFS_FH(inode), 6272 .bitmask = bitmask, 6273 }; 6274 struct nfs4_getattr_res res = { 6275 .fattr = &fattr, 6276 .server = server, 6277 }; 6278 struct rpc_message msg = { 6279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6280 .rpc_argp = &arg, 6281 .rpc_resp = &res, 6282 }; 6283 int ret; 6284 6285 nfs_fattr_init(&fattr); 6286 6287 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6288 if (ret) 6289 return ret; 6290 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6291 return -ENOENT; 6292 return label.len; 6293 } 6294 6295 static int nfs4_get_security_label(struct inode *inode, void *buf, 6296 size_t buflen) 6297 { 6298 struct nfs4_exception exception = { 6299 .interruptible = true, 6300 }; 6301 int err; 6302 6303 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6304 return -EOPNOTSUPP; 6305 6306 do { 6307 err = _nfs4_get_security_label(inode, buf, buflen); 6308 trace_nfs4_get_security_label(inode, err); 6309 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6310 &exception); 6311 } while (exception.retry); 6312 return err; 6313 } 6314 6315 static int _nfs4_do_set_security_label(struct inode *inode, 6316 struct nfs4_label *ilabel, 6317 struct nfs_fattr *fattr) 6318 { 6319 6320 struct iattr sattr = {0}; 6321 struct nfs_server *server = NFS_SERVER(inode); 6322 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6323 struct nfs_setattrargs arg = { 6324 .fh = NFS_FH(inode), 6325 .iap = &sattr, 6326 .server = server, 6327 .bitmask = bitmask, 6328 .label = ilabel, 6329 }; 6330 struct nfs_setattrres res = { 6331 .fattr = fattr, 6332 .server = server, 6333 }; 6334 struct rpc_message msg = { 6335 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6336 .rpc_argp = &arg, 6337 .rpc_resp = &res, 6338 }; 6339 int status; 6340 6341 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6342 6343 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6344 if (status) 6345 dprintk("%s failed: %d\n", __func__, status); 6346 6347 return status; 6348 } 6349 6350 static int nfs4_do_set_security_label(struct inode *inode, 6351 struct nfs4_label *ilabel, 6352 struct nfs_fattr *fattr) 6353 { 6354 struct nfs4_exception exception = { }; 6355 int err; 6356 6357 do { 6358 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6359 trace_nfs4_set_security_label(inode, err); 6360 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6361 &exception); 6362 } while (exception.retry); 6363 return err; 6364 } 6365 6366 static int 6367 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6368 { 6369 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6370 struct nfs_fattr *fattr; 6371 int status; 6372 6373 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6374 return -EOPNOTSUPP; 6375 6376 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6377 if (fattr == NULL) 6378 return -ENOMEM; 6379 6380 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6381 if (status == 0) 6382 nfs_setsecurity(inode, fattr); 6383 6384 nfs_free_fattr(fattr); 6385 return status; 6386 } 6387 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6388 6389 6390 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6391 nfs4_verifier *bootverf) 6392 { 6393 __be32 verf[2]; 6394 6395 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6396 /* An impossible timestamp guarantees this value 6397 * will never match a generated boot time. */ 6398 verf[0] = cpu_to_be32(U32_MAX); 6399 verf[1] = cpu_to_be32(U32_MAX); 6400 } else { 6401 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6402 u64 ns = ktime_to_ns(nn->boot_time); 6403 6404 verf[0] = cpu_to_be32(ns >> 32); 6405 verf[1] = cpu_to_be32(ns); 6406 } 6407 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6408 } 6409 6410 static size_t 6411 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6412 { 6413 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6414 struct nfs_netns_client *nn_clp = nn->nfs_client; 6415 const char *id; 6416 6417 buf[0] = '\0'; 6418 6419 if (nn_clp) { 6420 rcu_read_lock(); 6421 id = rcu_dereference(nn_clp->identifier); 6422 if (id) 6423 strscpy(buf, id, buflen); 6424 rcu_read_unlock(); 6425 } 6426 6427 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6428 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6429 6430 return strlen(buf); 6431 } 6432 6433 static int 6434 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6435 { 6436 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6437 size_t buflen; 6438 size_t len; 6439 char *str; 6440 6441 if (clp->cl_owner_id != NULL) 6442 return 0; 6443 6444 rcu_read_lock(); 6445 len = 14 + 6446 strlen(clp->cl_rpcclient->cl_nodename) + 6447 1 + 6448 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6449 1; 6450 rcu_read_unlock(); 6451 6452 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6453 if (buflen) 6454 len += buflen + 1; 6455 6456 if (len > NFS4_OPAQUE_LIMIT + 1) 6457 return -EINVAL; 6458 6459 /* 6460 * Since this string is allocated at mount time, and held until the 6461 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6462 * about a memory-reclaim deadlock. 6463 */ 6464 str = kmalloc(len, GFP_KERNEL); 6465 if (!str) 6466 return -ENOMEM; 6467 6468 rcu_read_lock(); 6469 if (buflen) 6470 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6471 clp->cl_rpcclient->cl_nodename, buf, 6472 rpc_peeraddr2str(clp->cl_rpcclient, 6473 RPC_DISPLAY_ADDR)); 6474 else 6475 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6476 clp->cl_rpcclient->cl_nodename, 6477 rpc_peeraddr2str(clp->cl_rpcclient, 6478 RPC_DISPLAY_ADDR)); 6479 rcu_read_unlock(); 6480 6481 clp->cl_owner_id = str; 6482 return 0; 6483 } 6484 6485 static int 6486 nfs4_init_uniform_client_string(struct nfs_client *clp) 6487 { 6488 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6489 size_t buflen; 6490 size_t len; 6491 char *str; 6492 6493 if (clp->cl_owner_id != NULL) 6494 return 0; 6495 6496 len = 10 + 10 + 1 + 10 + 1 + 6497 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6498 6499 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6500 if (buflen) 6501 len += buflen + 1; 6502 6503 if (len > NFS4_OPAQUE_LIMIT + 1) 6504 return -EINVAL; 6505 6506 /* 6507 * Since this string is allocated at mount time, and held until the 6508 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6509 * about a memory-reclaim deadlock. 6510 */ 6511 str = kmalloc(len, GFP_KERNEL); 6512 if (!str) 6513 return -ENOMEM; 6514 6515 if (buflen) 6516 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6517 clp->rpc_ops->version, clp->cl_minorversion, 6518 buf, clp->cl_rpcclient->cl_nodename); 6519 else 6520 scnprintf(str, len, "Linux NFSv%u.%u %s", 6521 clp->rpc_ops->version, clp->cl_minorversion, 6522 clp->cl_rpcclient->cl_nodename); 6523 clp->cl_owner_id = str; 6524 return 0; 6525 } 6526 6527 /* 6528 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6529 * services. Advertise one based on the address family of the 6530 * clientaddr. 6531 */ 6532 static unsigned int 6533 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6534 { 6535 if (strchr(clp->cl_ipaddr, ':') != NULL) 6536 return scnprintf(buf, len, "tcp6"); 6537 else 6538 return scnprintf(buf, len, "tcp"); 6539 } 6540 6541 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6542 { 6543 struct nfs4_setclientid *sc = calldata; 6544 6545 if (task->tk_status == 0) 6546 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6547 } 6548 6549 static const struct rpc_call_ops nfs4_setclientid_ops = { 6550 .rpc_call_done = nfs4_setclientid_done, 6551 }; 6552 6553 /** 6554 * nfs4_proc_setclientid - Negotiate client ID 6555 * @clp: state data structure 6556 * @program: RPC program for NFSv4 callback service 6557 * @port: IP port number for NFS4 callback service 6558 * @cred: credential to use for this call 6559 * @res: where to place the result 6560 * 6561 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6562 */ 6563 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6564 unsigned short port, const struct cred *cred, 6565 struct nfs4_setclientid_res *res) 6566 { 6567 nfs4_verifier sc_verifier; 6568 struct nfs4_setclientid setclientid = { 6569 .sc_verifier = &sc_verifier, 6570 .sc_prog = program, 6571 .sc_clnt = clp, 6572 }; 6573 struct rpc_message msg = { 6574 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6575 .rpc_argp = &setclientid, 6576 .rpc_resp = res, 6577 .rpc_cred = cred, 6578 }; 6579 struct rpc_task_setup task_setup_data = { 6580 .rpc_client = clp->cl_rpcclient, 6581 .rpc_message = &msg, 6582 .callback_ops = &nfs4_setclientid_ops, 6583 .callback_data = &setclientid, 6584 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6585 }; 6586 unsigned long now = jiffies; 6587 int status; 6588 6589 /* nfs_client_id4 */ 6590 nfs4_init_boot_verifier(clp, &sc_verifier); 6591 6592 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6593 status = nfs4_init_uniform_client_string(clp); 6594 else 6595 status = nfs4_init_nonuniform_client_string(clp); 6596 6597 if (status) 6598 goto out; 6599 6600 /* cb_client4 */ 6601 setclientid.sc_netid_len = 6602 nfs4_init_callback_netid(clp, 6603 setclientid.sc_netid, 6604 sizeof(setclientid.sc_netid)); 6605 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6606 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6607 clp->cl_ipaddr, port >> 8, port & 255); 6608 6609 dprintk("NFS call setclientid auth=%s, '%s'\n", 6610 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6611 clp->cl_owner_id); 6612 6613 status = nfs4_call_sync_custom(&task_setup_data); 6614 if (setclientid.sc_cred) { 6615 kfree(clp->cl_acceptor); 6616 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6617 put_rpccred(setclientid.sc_cred); 6618 } 6619 6620 if (status == 0) 6621 do_renew_lease(clp, now); 6622 out: 6623 trace_nfs4_setclientid(clp, status); 6624 dprintk("NFS reply setclientid: %d\n", status); 6625 return status; 6626 } 6627 6628 /** 6629 * nfs4_proc_setclientid_confirm - Confirm client ID 6630 * @clp: state data structure 6631 * @arg: result of a previous SETCLIENTID 6632 * @cred: credential to use for this call 6633 * 6634 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6635 */ 6636 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6637 struct nfs4_setclientid_res *arg, 6638 const struct cred *cred) 6639 { 6640 struct rpc_message msg = { 6641 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6642 .rpc_argp = arg, 6643 .rpc_cred = cred, 6644 }; 6645 int status; 6646 6647 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6648 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6649 clp->cl_clientid); 6650 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6651 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6652 trace_nfs4_setclientid_confirm(clp, status); 6653 dprintk("NFS reply setclientid_confirm: %d\n", status); 6654 return status; 6655 } 6656 6657 struct nfs4_delegreturndata { 6658 struct nfs4_delegreturnargs args; 6659 struct nfs4_delegreturnres res; 6660 struct nfs_fh fh; 6661 nfs4_stateid stateid; 6662 unsigned long timestamp; 6663 struct { 6664 struct nfs4_layoutreturn_args arg; 6665 struct nfs4_layoutreturn_res res; 6666 struct nfs4_xdr_opaque_data ld_private; 6667 u32 roc_barrier; 6668 bool roc; 6669 } lr; 6670 struct nfs4_delegattr sattr; 6671 struct nfs_fattr fattr; 6672 int rpc_status; 6673 struct inode *inode; 6674 }; 6675 6676 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6677 { 6678 struct nfs4_delegreturndata *data = calldata; 6679 struct nfs4_exception exception = { 6680 .inode = data->inode, 6681 .stateid = &data->stateid, 6682 .task_is_privileged = data->args.seq_args.sa_privileged, 6683 }; 6684 6685 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6686 return; 6687 6688 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6689 6690 /* Handle Layoutreturn errors */ 6691 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6692 &data->res.lr_ret) == -EAGAIN) 6693 goto out_restart; 6694 6695 if (data->args.sattr_args && task->tk_status != 0) { 6696 switch(data->res.sattr_ret) { 6697 case 0: 6698 data->args.sattr_args = NULL; 6699 data->res.sattr_res = false; 6700 break; 6701 case -NFS4ERR_ADMIN_REVOKED: 6702 case -NFS4ERR_DELEG_REVOKED: 6703 case -NFS4ERR_EXPIRED: 6704 case -NFS4ERR_BAD_STATEID: 6705 /* Let the main handler below do stateid recovery */ 6706 break; 6707 case -NFS4ERR_OLD_STATEID: 6708 if (nfs4_refresh_delegation_stateid(&data->stateid, 6709 data->inode)) 6710 goto out_restart; 6711 fallthrough; 6712 default: 6713 data->args.sattr_args = NULL; 6714 data->res.sattr_res = false; 6715 goto out_restart; 6716 } 6717 } 6718 6719 switch (task->tk_status) { 6720 case 0: 6721 renew_lease(data->res.server, data->timestamp); 6722 break; 6723 case -NFS4ERR_ADMIN_REVOKED: 6724 case -NFS4ERR_DELEG_REVOKED: 6725 case -NFS4ERR_EXPIRED: 6726 nfs4_free_revoked_stateid(data->res.server, 6727 data->args.stateid, 6728 task->tk_msg.rpc_cred); 6729 fallthrough; 6730 case -NFS4ERR_BAD_STATEID: 6731 case -NFS4ERR_STALE_STATEID: 6732 case -ETIMEDOUT: 6733 task->tk_status = 0; 6734 break; 6735 case -NFS4ERR_OLD_STATEID: 6736 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6737 nfs4_stateid_seqid_inc(&data->stateid); 6738 if (data->args.bitmask) { 6739 data->args.bitmask = NULL; 6740 data->res.fattr = NULL; 6741 } 6742 goto out_restart; 6743 case -NFS4ERR_ACCESS: 6744 if (data->args.bitmask) { 6745 data->args.bitmask = NULL; 6746 data->res.fattr = NULL; 6747 goto out_restart; 6748 } 6749 fallthrough; 6750 default: 6751 task->tk_status = nfs4_async_handle_exception(task, 6752 data->res.server, task->tk_status, 6753 &exception); 6754 if (exception.retry) 6755 goto out_restart; 6756 } 6757 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6758 data->rpc_status = task->tk_status; 6759 return; 6760 out_restart: 6761 task->tk_status = 0; 6762 rpc_restart_call_prepare(task); 6763 } 6764 6765 static void nfs4_delegreturn_release(void *calldata) 6766 { 6767 struct nfs4_delegreturndata *data = calldata; 6768 struct inode *inode = data->inode; 6769 6770 if (data->lr.roc) 6771 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6772 data->res.lr_ret); 6773 if (inode) { 6774 nfs4_fattr_set_prechange(&data->fattr, 6775 inode_peek_iversion_raw(inode)); 6776 nfs_refresh_inode(inode, &data->fattr); 6777 nfs_iput_and_deactive(inode); 6778 } 6779 kfree(calldata); 6780 } 6781 6782 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6783 { 6784 struct nfs4_delegreturndata *d_data; 6785 struct pnfs_layout_hdr *lo; 6786 6787 d_data = data; 6788 6789 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6790 nfs4_sequence_done(task, &d_data->res.seq_res); 6791 return; 6792 } 6793 6794 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6795 if (lo && !pnfs_layout_is_valid(lo)) { 6796 d_data->args.lr_args = NULL; 6797 d_data->res.lr_res = NULL; 6798 } 6799 6800 nfs4_setup_sequence(d_data->res.server->nfs_client, 6801 &d_data->args.seq_args, 6802 &d_data->res.seq_res, 6803 task); 6804 } 6805 6806 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6807 .rpc_call_prepare = nfs4_delegreturn_prepare, 6808 .rpc_call_done = nfs4_delegreturn_done, 6809 .rpc_release = nfs4_delegreturn_release, 6810 }; 6811 6812 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, 6813 const nfs4_stateid *stateid, 6814 struct nfs_delegation *delegation, 6815 int issync) 6816 { 6817 struct nfs4_delegreturndata *data; 6818 struct nfs_server *server = NFS_SERVER(inode); 6819 struct rpc_task *task; 6820 struct rpc_message msg = { 6821 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6822 .rpc_cred = cred, 6823 }; 6824 struct rpc_task_setup task_setup_data = { 6825 .rpc_client = server->client, 6826 .rpc_message = &msg, 6827 .callback_ops = &nfs4_delegreturn_ops, 6828 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6829 }; 6830 int status = 0; 6831 6832 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6833 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6834 6835 data = kzalloc(sizeof(*data), GFP_KERNEL); 6836 if (data == NULL) 6837 return -ENOMEM; 6838 6839 nfs4_state_protect(server->nfs_client, 6840 NFS_SP4_MACH_CRED_CLEANUP, 6841 &task_setup_data.rpc_client, &msg); 6842 6843 data->args.fhandle = &data->fh; 6844 data->args.stateid = &data->stateid; 6845 nfs4_bitmask_set(data->args.bitmask_store, 6846 server->cache_consistency_bitmask, inode, 0); 6847 data->args.bitmask = data->args.bitmask_store; 6848 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6849 nfs4_stateid_copy(&data->stateid, stateid); 6850 data->res.fattr = &data->fattr; 6851 data->res.server = server; 6852 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6853 data->lr.arg.ld_private = &data->lr.ld_private; 6854 nfs_fattr_init(data->res.fattr); 6855 data->timestamp = jiffies; 6856 data->rpc_status = 0; 6857 data->inode = nfs_igrab_and_active(inode); 6858 if (data->inode || issync) { 6859 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6860 cred); 6861 if (data->lr.roc) { 6862 data->args.lr_args = &data->lr.arg; 6863 data->res.lr_res = &data->lr.res; 6864 } 6865 } 6866 6867 if (delegation && 6868 test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) { 6869 if (delegation->type & FMODE_READ) { 6870 data->sattr.atime = inode_get_atime(inode); 6871 data->sattr.atime_set = true; 6872 } 6873 if (delegation->type & FMODE_WRITE) { 6874 data->sattr.mtime = inode_get_mtime(inode); 6875 data->sattr.mtime_set = true; 6876 } 6877 data->args.sattr_args = &data->sattr; 6878 data->res.sattr_res = true; 6879 } 6880 6881 if (!data->inode) 6882 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6883 1); 6884 else 6885 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6886 0); 6887 6888 task_setup_data.callback_data = data; 6889 msg.rpc_argp = &data->args; 6890 msg.rpc_resp = &data->res; 6891 task = rpc_run_task(&task_setup_data); 6892 if (IS_ERR(task)) 6893 return PTR_ERR(task); 6894 if (!issync) 6895 goto out; 6896 status = rpc_wait_for_completion_task(task); 6897 if (status != 0) 6898 goto out; 6899 status = data->rpc_status; 6900 out: 6901 rpc_put_task(task); 6902 return status; 6903 } 6904 6905 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, 6906 const nfs4_stateid *stateid, 6907 struct nfs_delegation *delegation, int issync) 6908 { 6909 struct nfs_server *server = NFS_SERVER(inode); 6910 struct nfs4_exception exception = { }; 6911 int err; 6912 do { 6913 err = _nfs4_proc_delegreturn(inode, cred, stateid, 6914 delegation, issync); 6915 trace_nfs4_delegreturn(inode, stateid, err); 6916 switch (err) { 6917 case -NFS4ERR_STALE_STATEID: 6918 case -NFS4ERR_EXPIRED: 6919 case 0: 6920 return 0; 6921 } 6922 err = nfs4_handle_exception(server, err, &exception); 6923 } while (exception.retry); 6924 return err; 6925 } 6926 6927 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6928 { 6929 struct inode *inode = state->inode; 6930 struct nfs_server *server = NFS_SERVER(inode); 6931 struct nfs_client *clp = server->nfs_client; 6932 struct nfs_lockt_args arg = { 6933 .fh = NFS_FH(inode), 6934 .fl = request, 6935 }; 6936 struct nfs_lockt_res res = { 6937 .denied = request, 6938 }; 6939 struct rpc_message msg = { 6940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6941 .rpc_argp = &arg, 6942 .rpc_resp = &res, 6943 .rpc_cred = state->owner->so_cred, 6944 }; 6945 struct nfs4_lock_state *lsp; 6946 int status; 6947 6948 arg.lock_owner.clientid = clp->cl_clientid; 6949 status = nfs4_set_lock_state(state, request); 6950 if (status != 0) 6951 goto out; 6952 lsp = request->fl_u.nfs4_fl.owner; 6953 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6954 arg.lock_owner.s_dev = server->s_dev; 6955 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6956 switch (status) { 6957 case 0: 6958 request->c.flc_type = F_UNLCK; 6959 break; 6960 case -NFS4ERR_DENIED: 6961 status = 0; 6962 } 6963 request->fl_ops->fl_release_private(request); 6964 request->fl_ops = NULL; 6965 out: 6966 return status; 6967 } 6968 6969 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6970 { 6971 struct nfs4_exception exception = { 6972 .interruptible = true, 6973 }; 6974 int err; 6975 6976 do { 6977 err = _nfs4_proc_getlk(state, cmd, request); 6978 trace_nfs4_get_lock(request, state, cmd, err); 6979 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6980 &exception); 6981 } while (exception.retry); 6982 return err; 6983 } 6984 6985 /* 6986 * Update the seqid of a lock stateid after receiving 6987 * NFS4ERR_OLD_STATEID 6988 */ 6989 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6990 struct nfs4_lock_state *lsp) 6991 { 6992 struct nfs4_state *state = lsp->ls_state; 6993 bool ret = false; 6994 6995 spin_lock(&state->state_lock); 6996 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6997 goto out; 6998 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6999 nfs4_stateid_seqid_inc(dst); 7000 else 7001 dst->seqid = lsp->ls_stateid.seqid; 7002 ret = true; 7003 out: 7004 spin_unlock(&state->state_lock); 7005 return ret; 7006 } 7007 7008 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 7009 struct nfs4_lock_state *lsp) 7010 { 7011 struct nfs4_state *state = lsp->ls_state; 7012 bool ret; 7013 7014 spin_lock(&state->state_lock); 7015 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 7016 nfs4_stateid_copy(dst, &lsp->ls_stateid); 7017 spin_unlock(&state->state_lock); 7018 return ret; 7019 } 7020 7021 struct nfs4_unlockdata { 7022 struct nfs_locku_args arg; 7023 struct nfs_locku_res res; 7024 struct nfs4_lock_state *lsp; 7025 struct nfs_open_context *ctx; 7026 struct nfs_lock_context *l_ctx; 7027 struct file_lock fl; 7028 struct nfs_server *server; 7029 unsigned long timestamp; 7030 }; 7031 7032 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 7033 struct nfs_open_context *ctx, 7034 struct nfs4_lock_state *lsp, 7035 struct nfs_seqid *seqid) 7036 { 7037 struct nfs4_unlockdata *p; 7038 struct nfs4_state *state = lsp->ls_state; 7039 struct inode *inode = state->inode; 7040 7041 p = kzalloc(sizeof(*p), GFP_KERNEL); 7042 if (p == NULL) 7043 return NULL; 7044 p->arg.fh = NFS_FH(inode); 7045 p->arg.fl = &p->fl; 7046 p->arg.seqid = seqid; 7047 p->res.seqid = seqid; 7048 p->lsp = lsp; 7049 /* Ensure we don't close file until we're done freeing locks! */ 7050 p->ctx = get_nfs_open_context(ctx); 7051 p->l_ctx = nfs_get_lock_context(ctx); 7052 locks_init_lock(&p->fl); 7053 locks_copy_lock(&p->fl, fl); 7054 p->server = NFS_SERVER(inode); 7055 spin_lock(&state->state_lock); 7056 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 7057 spin_unlock(&state->state_lock); 7058 return p; 7059 } 7060 7061 static void nfs4_locku_release_calldata(void *data) 7062 { 7063 struct nfs4_unlockdata *calldata = data; 7064 nfs_free_seqid(calldata->arg.seqid); 7065 nfs4_put_lock_state(calldata->lsp); 7066 nfs_put_lock_context(calldata->l_ctx); 7067 put_nfs_open_context(calldata->ctx); 7068 kfree(calldata); 7069 } 7070 7071 static void nfs4_locku_done(struct rpc_task *task, void *data) 7072 { 7073 struct nfs4_unlockdata *calldata = data; 7074 struct nfs4_exception exception = { 7075 .inode = calldata->lsp->ls_state->inode, 7076 .stateid = &calldata->arg.stateid, 7077 }; 7078 7079 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 7080 return; 7081 switch (task->tk_status) { 7082 case 0: 7083 renew_lease(calldata->server, calldata->timestamp); 7084 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 7085 if (nfs4_update_lock_stateid(calldata->lsp, 7086 &calldata->res.stateid)) 7087 break; 7088 fallthrough; 7089 case -NFS4ERR_ADMIN_REVOKED: 7090 case -NFS4ERR_EXPIRED: 7091 nfs4_free_revoked_stateid(calldata->server, 7092 &calldata->arg.stateid, 7093 task->tk_msg.rpc_cred); 7094 fallthrough; 7095 case -NFS4ERR_BAD_STATEID: 7096 case -NFS4ERR_STALE_STATEID: 7097 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 7098 calldata->lsp)) 7099 rpc_restart_call_prepare(task); 7100 break; 7101 case -NFS4ERR_OLD_STATEID: 7102 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 7103 calldata->lsp)) 7104 rpc_restart_call_prepare(task); 7105 break; 7106 default: 7107 task->tk_status = nfs4_async_handle_exception(task, 7108 calldata->server, task->tk_status, 7109 &exception); 7110 if (exception.retry) 7111 rpc_restart_call_prepare(task); 7112 } 7113 nfs_release_seqid(calldata->arg.seqid); 7114 } 7115 7116 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 7117 { 7118 struct nfs4_unlockdata *calldata = data; 7119 7120 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 7121 nfs_async_iocounter_wait(task, calldata->l_ctx)) 7122 return; 7123 7124 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 7125 goto out_wait; 7126 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 7127 /* Note: exit _without_ running nfs4_locku_done */ 7128 goto out_no_action; 7129 } 7130 calldata->timestamp = jiffies; 7131 if (nfs4_setup_sequence(calldata->server->nfs_client, 7132 &calldata->arg.seq_args, 7133 &calldata->res.seq_res, 7134 task) != 0) 7135 nfs_release_seqid(calldata->arg.seqid); 7136 return; 7137 out_no_action: 7138 task->tk_action = NULL; 7139 out_wait: 7140 nfs4_sequence_done(task, &calldata->res.seq_res); 7141 } 7142 7143 static const struct rpc_call_ops nfs4_locku_ops = { 7144 .rpc_call_prepare = nfs4_locku_prepare, 7145 .rpc_call_done = nfs4_locku_done, 7146 .rpc_release = nfs4_locku_release_calldata, 7147 }; 7148 7149 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 7150 struct nfs_open_context *ctx, 7151 struct nfs4_lock_state *lsp, 7152 struct nfs_seqid *seqid) 7153 { 7154 struct nfs4_unlockdata *data; 7155 struct rpc_message msg = { 7156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 7157 .rpc_cred = ctx->cred, 7158 }; 7159 struct rpc_task_setup task_setup_data = { 7160 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 7161 .rpc_message = &msg, 7162 .callback_ops = &nfs4_locku_ops, 7163 .workqueue = nfsiod_workqueue, 7164 .flags = RPC_TASK_ASYNC, 7165 }; 7166 7167 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 7168 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7169 7170 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 7171 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 7172 7173 /* Ensure this is an unlock - when canceling a lock, the 7174 * canceled lock is passed in, and it won't be an unlock. 7175 */ 7176 fl->c.flc_type = F_UNLCK; 7177 if (fl->c.flc_flags & FL_CLOSE) 7178 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 7179 7180 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7181 if (data == NULL) { 7182 nfs_free_seqid(seqid); 7183 return ERR_PTR(-ENOMEM); 7184 } 7185 7186 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7187 msg.rpc_argp = &data->arg; 7188 msg.rpc_resp = &data->res; 7189 task_setup_data.callback_data = data; 7190 return rpc_run_task(&task_setup_data); 7191 } 7192 7193 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7194 { 7195 struct inode *inode = state->inode; 7196 struct nfs4_state_owner *sp = state->owner; 7197 struct nfs_inode *nfsi = NFS_I(inode); 7198 struct nfs_seqid *seqid; 7199 struct nfs4_lock_state *lsp; 7200 struct rpc_task *task; 7201 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7202 int status = 0; 7203 unsigned char saved_flags = request->c.flc_flags; 7204 7205 status = nfs4_set_lock_state(state, request); 7206 /* Unlock _before_ we do the RPC call */ 7207 request->c.flc_flags |= FL_EXISTS; 7208 /* Exclude nfs_delegation_claim_locks() */ 7209 mutex_lock(&sp->so_delegreturn_mutex); 7210 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7211 down_read(&nfsi->rwsem); 7212 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7213 up_read(&nfsi->rwsem); 7214 mutex_unlock(&sp->so_delegreturn_mutex); 7215 goto out; 7216 } 7217 lsp = request->fl_u.nfs4_fl.owner; 7218 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7219 up_read(&nfsi->rwsem); 7220 mutex_unlock(&sp->so_delegreturn_mutex); 7221 if (status != 0) 7222 goto out; 7223 /* Is this a delegated lock? */ 7224 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7225 goto out; 7226 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7227 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7228 status = -ENOMEM; 7229 if (IS_ERR(seqid)) 7230 goto out; 7231 task = nfs4_do_unlck(request, 7232 nfs_file_open_context(request->c.flc_file), 7233 lsp, seqid); 7234 status = PTR_ERR(task); 7235 if (IS_ERR(task)) 7236 goto out; 7237 status = rpc_wait_for_completion_task(task); 7238 rpc_put_task(task); 7239 out: 7240 request->c.flc_flags = saved_flags; 7241 trace_nfs4_unlock(request, state, F_SETLK, status); 7242 return status; 7243 } 7244 7245 struct nfs4_lockdata { 7246 struct nfs_lock_args arg; 7247 struct nfs_lock_res res; 7248 struct nfs4_lock_state *lsp; 7249 struct nfs_open_context *ctx; 7250 struct file_lock fl; 7251 unsigned long timestamp; 7252 int rpc_status; 7253 int cancelled; 7254 struct nfs_server *server; 7255 }; 7256 7257 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7258 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7259 gfp_t gfp_mask) 7260 { 7261 struct nfs4_lockdata *p; 7262 struct inode *inode = lsp->ls_state->inode; 7263 struct nfs_server *server = NFS_SERVER(inode); 7264 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7265 7266 p = kzalloc(sizeof(*p), gfp_mask); 7267 if (p == NULL) 7268 return NULL; 7269 7270 p->arg.fh = NFS_FH(inode); 7271 p->arg.fl = &p->fl; 7272 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7273 if (IS_ERR(p->arg.open_seqid)) 7274 goto out_free; 7275 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7276 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7277 if (IS_ERR(p->arg.lock_seqid)) 7278 goto out_free_seqid; 7279 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7280 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7281 p->arg.lock_owner.s_dev = server->s_dev; 7282 p->res.lock_seqid = p->arg.lock_seqid; 7283 p->lsp = lsp; 7284 p->server = server; 7285 p->ctx = get_nfs_open_context(ctx); 7286 locks_init_lock(&p->fl); 7287 locks_copy_lock(&p->fl, fl); 7288 return p; 7289 out_free_seqid: 7290 nfs_free_seqid(p->arg.open_seqid); 7291 out_free: 7292 kfree(p); 7293 return NULL; 7294 } 7295 7296 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7297 { 7298 struct nfs4_lockdata *data = calldata; 7299 struct nfs4_state *state = data->lsp->ls_state; 7300 7301 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7302 goto out_wait; 7303 /* Do we need to do an open_to_lock_owner? */ 7304 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7305 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7306 goto out_release_lock_seqid; 7307 } 7308 nfs4_stateid_copy(&data->arg.open_stateid, 7309 &state->open_stateid); 7310 data->arg.new_lock_owner = 1; 7311 data->res.open_seqid = data->arg.open_seqid; 7312 } else { 7313 data->arg.new_lock_owner = 0; 7314 nfs4_stateid_copy(&data->arg.lock_stateid, 7315 &data->lsp->ls_stateid); 7316 } 7317 if (!nfs4_valid_open_stateid(state)) { 7318 data->rpc_status = -EBADF; 7319 task->tk_action = NULL; 7320 goto out_release_open_seqid; 7321 } 7322 data->timestamp = jiffies; 7323 if (nfs4_setup_sequence(data->server->nfs_client, 7324 &data->arg.seq_args, 7325 &data->res.seq_res, 7326 task) == 0) 7327 return; 7328 out_release_open_seqid: 7329 nfs_release_seqid(data->arg.open_seqid); 7330 out_release_lock_seqid: 7331 nfs_release_seqid(data->arg.lock_seqid); 7332 out_wait: 7333 nfs4_sequence_done(task, &data->res.seq_res); 7334 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7335 } 7336 7337 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7338 { 7339 struct nfs4_lockdata *data = calldata; 7340 struct nfs4_lock_state *lsp = data->lsp; 7341 7342 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7343 return; 7344 7345 data->rpc_status = task->tk_status; 7346 switch (task->tk_status) { 7347 case 0: 7348 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7349 data->timestamp); 7350 if (data->arg.new_lock && !data->cancelled) { 7351 data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS); 7352 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7353 goto out_restart; 7354 } 7355 if (data->arg.new_lock_owner != 0) { 7356 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7357 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7358 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7359 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7360 goto out_restart; 7361 break; 7362 case -NFS4ERR_OLD_STATEID: 7363 if (data->arg.new_lock_owner != 0 && 7364 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7365 lsp->ls_state)) 7366 goto out_restart; 7367 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7368 goto out_restart; 7369 fallthrough; 7370 case -NFS4ERR_BAD_STATEID: 7371 case -NFS4ERR_STALE_STATEID: 7372 case -NFS4ERR_EXPIRED: 7373 if (data->arg.new_lock_owner != 0) { 7374 if (!nfs4_stateid_match(&data->arg.open_stateid, 7375 &lsp->ls_state->open_stateid)) 7376 goto out_restart; 7377 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7378 &lsp->ls_stateid)) 7379 goto out_restart; 7380 } 7381 out_done: 7382 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7383 return; 7384 out_restart: 7385 if (!data->cancelled) 7386 rpc_restart_call_prepare(task); 7387 goto out_done; 7388 } 7389 7390 static void nfs4_lock_release(void *calldata) 7391 { 7392 struct nfs4_lockdata *data = calldata; 7393 7394 nfs_free_seqid(data->arg.open_seqid); 7395 if (data->cancelled && data->rpc_status == 0) { 7396 struct rpc_task *task; 7397 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7398 data->arg.lock_seqid); 7399 if (!IS_ERR(task)) 7400 rpc_put_task_async(task); 7401 dprintk("%s: cancelling lock!\n", __func__); 7402 } else 7403 nfs_free_seqid(data->arg.lock_seqid); 7404 nfs4_put_lock_state(data->lsp); 7405 put_nfs_open_context(data->ctx); 7406 kfree(data); 7407 } 7408 7409 static const struct rpc_call_ops nfs4_lock_ops = { 7410 .rpc_call_prepare = nfs4_lock_prepare, 7411 .rpc_call_done = nfs4_lock_done, 7412 .rpc_release = nfs4_lock_release, 7413 }; 7414 7415 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7416 { 7417 switch (error) { 7418 case -NFS4ERR_ADMIN_REVOKED: 7419 case -NFS4ERR_EXPIRED: 7420 case -NFS4ERR_BAD_STATEID: 7421 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7422 if (new_lock_owner != 0 || 7423 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7424 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7425 break; 7426 case -NFS4ERR_STALE_STATEID: 7427 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7428 nfs4_schedule_lease_recovery(server->nfs_client); 7429 } 7430 } 7431 7432 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7433 { 7434 struct nfs4_lockdata *data; 7435 struct rpc_task *task; 7436 struct rpc_message msg = { 7437 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7438 .rpc_cred = state->owner->so_cred, 7439 }; 7440 struct rpc_task_setup task_setup_data = { 7441 .rpc_client = NFS_CLIENT(state->inode), 7442 .rpc_message = &msg, 7443 .callback_ops = &nfs4_lock_ops, 7444 .workqueue = nfsiod_workqueue, 7445 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7446 }; 7447 int ret; 7448 7449 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7450 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7451 7452 data = nfs4_alloc_lockdata(fl, 7453 nfs_file_open_context(fl->c.flc_file), 7454 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7455 if (data == NULL) 7456 return -ENOMEM; 7457 if (IS_SETLKW(cmd)) 7458 data->arg.block = 1; 7459 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7460 recovery_type > NFS_LOCK_NEW); 7461 msg.rpc_argp = &data->arg; 7462 msg.rpc_resp = &data->res; 7463 task_setup_data.callback_data = data; 7464 if (recovery_type > NFS_LOCK_NEW) { 7465 if (recovery_type == NFS_LOCK_RECLAIM) 7466 data->arg.reclaim = NFS_LOCK_RECLAIM; 7467 } else 7468 data->arg.new_lock = 1; 7469 task = rpc_run_task(&task_setup_data); 7470 if (IS_ERR(task)) 7471 return PTR_ERR(task); 7472 ret = rpc_wait_for_completion_task(task); 7473 if (ret == 0) { 7474 ret = data->rpc_status; 7475 if (ret) 7476 nfs4_handle_setlk_error(data->server, data->lsp, 7477 data->arg.new_lock_owner, ret); 7478 } else 7479 data->cancelled = true; 7480 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7481 rpc_put_task(task); 7482 dprintk("%s: ret = %d\n", __func__, ret); 7483 return ret; 7484 } 7485 7486 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7487 { 7488 struct nfs_server *server = NFS_SERVER(state->inode); 7489 struct nfs4_exception exception = { 7490 .inode = state->inode, 7491 }; 7492 int err; 7493 7494 do { 7495 /* Cache the lock if possible... */ 7496 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7497 return 0; 7498 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7499 if (err != -NFS4ERR_DELAY) 7500 break; 7501 nfs4_handle_exception(server, err, &exception); 7502 } while (exception.retry); 7503 return err; 7504 } 7505 7506 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7507 { 7508 struct nfs_server *server = NFS_SERVER(state->inode); 7509 struct nfs4_exception exception = { 7510 .inode = state->inode, 7511 }; 7512 int err; 7513 7514 err = nfs4_set_lock_state(state, request); 7515 if (err != 0) 7516 return err; 7517 if (!recover_lost_locks) { 7518 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7519 return 0; 7520 } 7521 do { 7522 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7523 return 0; 7524 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7525 switch (err) { 7526 default: 7527 goto out; 7528 case -NFS4ERR_GRACE: 7529 case -NFS4ERR_DELAY: 7530 nfs4_handle_exception(server, err, &exception); 7531 err = 0; 7532 } 7533 } while (exception.retry); 7534 out: 7535 return err; 7536 } 7537 7538 #if defined(CONFIG_NFS_V4_1) 7539 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7540 { 7541 struct nfs4_lock_state *lsp; 7542 int status; 7543 7544 status = nfs4_set_lock_state(state, request); 7545 if (status != 0) 7546 return status; 7547 lsp = request->fl_u.nfs4_fl.owner; 7548 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7549 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7550 return 0; 7551 return nfs4_lock_expired(state, request); 7552 } 7553 #endif 7554 7555 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7556 { 7557 struct nfs_inode *nfsi = NFS_I(state->inode); 7558 struct nfs4_state_owner *sp = state->owner; 7559 unsigned char flags = request->c.flc_flags; 7560 int status; 7561 7562 request->c.flc_flags |= FL_ACCESS; 7563 status = locks_lock_inode_wait(state->inode, request); 7564 if (status < 0) 7565 goto out; 7566 mutex_lock(&sp->so_delegreturn_mutex); 7567 down_read(&nfsi->rwsem); 7568 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7569 /* Yes: cache locks! */ 7570 /* ...but avoid races with delegation recall... */ 7571 request->c.flc_flags = flags & ~FL_SLEEP; 7572 status = locks_lock_inode_wait(state->inode, request); 7573 up_read(&nfsi->rwsem); 7574 mutex_unlock(&sp->so_delegreturn_mutex); 7575 goto out; 7576 } 7577 up_read(&nfsi->rwsem); 7578 mutex_unlock(&sp->so_delegreturn_mutex); 7579 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7580 out: 7581 request->c.flc_flags = flags; 7582 return status; 7583 } 7584 7585 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7586 { 7587 struct nfs4_exception exception = { 7588 .state = state, 7589 .inode = state->inode, 7590 .interruptible = true, 7591 }; 7592 int err; 7593 7594 do { 7595 err = _nfs4_proc_setlk(state, cmd, request); 7596 if (err == -NFS4ERR_DENIED) 7597 err = -EAGAIN; 7598 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7599 err, &exception); 7600 } while (exception.retry); 7601 return err; 7602 } 7603 7604 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7605 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7606 7607 static int 7608 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7609 struct file_lock *request) 7610 { 7611 int status = -ERESTARTSYS; 7612 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7613 7614 while(!signalled()) { 7615 status = nfs4_proc_setlk(state, cmd, request); 7616 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7617 break; 7618 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7619 schedule_timeout(timeout); 7620 timeout *= 2; 7621 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7622 status = -ERESTARTSYS; 7623 } 7624 return status; 7625 } 7626 7627 #ifdef CONFIG_NFS_V4_1 7628 struct nfs4_lock_waiter { 7629 struct inode *inode; 7630 struct nfs_lowner owner; 7631 wait_queue_entry_t wait; 7632 }; 7633 7634 static int 7635 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7636 { 7637 struct nfs4_lock_waiter *waiter = 7638 container_of(wait, struct nfs4_lock_waiter, wait); 7639 7640 /* NULL key means to wake up everyone */ 7641 if (key) { 7642 struct cb_notify_lock_args *cbnl = key; 7643 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7644 *wowner = &waiter->owner; 7645 7646 /* Only wake if the callback was for the same owner. */ 7647 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7648 return 0; 7649 7650 /* Make sure it's for the right inode */ 7651 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7652 return 0; 7653 } 7654 7655 return woken_wake_function(wait, mode, flags, key); 7656 } 7657 7658 static int 7659 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7660 { 7661 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7662 struct nfs_server *server = NFS_SERVER(state->inode); 7663 struct nfs_client *clp = server->nfs_client; 7664 wait_queue_head_t *q = &clp->cl_lock_waitq; 7665 struct nfs4_lock_waiter waiter = { 7666 .inode = state->inode, 7667 .owner = { .clientid = clp->cl_clientid, 7668 .id = lsp->ls_seqid.owner_id, 7669 .s_dev = server->s_dev }, 7670 }; 7671 int status; 7672 7673 /* Don't bother with waitqueue if we don't expect a callback */ 7674 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7675 return nfs4_retry_setlk_simple(state, cmd, request); 7676 7677 init_wait(&waiter.wait); 7678 waiter.wait.func = nfs4_wake_lock_waiter; 7679 add_wait_queue(q, &waiter.wait); 7680 7681 do { 7682 status = nfs4_proc_setlk(state, cmd, request); 7683 if (status != -EAGAIN || IS_SETLK(cmd)) 7684 break; 7685 7686 status = -ERESTARTSYS; 7687 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7688 NFS4_LOCK_MAXTIMEOUT); 7689 } while (!signalled()); 7690 7691 remove_wait_queue(q, &waiter.wait); 7692 7693 return status; 7694 } 7695 #else /* !CONFIG_NFS_V4_1 */ 7696 static inline int 7697 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7698 { 7699 return nfs4_retry_setlk_simple(state, cmd, request); 7700 } 7701 #endif 7702 7703 static int 7704 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7705 { 7706 struct nfs_open_context *ctx; 7707 struct nfs4_state *state; 7708 int status; 7709 7710 /* verify open state */ 7711 ctx = nfs_file_open_context(filp); 7712 state = ctx->state; 7713 7714 if (IS_GETLK(cmd)) { 7715 if (state != NULL) 7716 return nfs4_proc_getlk(state, F_GETLK, request); 7717 return 0; 7718 } 7719 7720 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7721 return -EINVAL; 7722 7723 if (lock_is_unlock(request)) { 7724 if (state != NULL) 7725 return nfs4_proc_unlck(state, cmd, request); 7726 return 0; 7727 } 7728 7729 if (state == NULL) 7730 return -ENOLCK; 7731 7732 if ((request->c.flc_flags & FL_POSIX) && 7733 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7734 return -ENOLCK; 7735 7736 /* 7737 * Don't rely on the VFS having checked the file open mode, 7738 * since it won't do this for flock() locks. 7739 */ 7740 switch (request->c.flc_type) { 7741 case F_RDLCK: 7742 if (!(filp->f_mode & FMODE_READ)) 7743 return -EBADF; 7744 break; 7745 case F_WRLCK: 7746 if (!(filp->f_mode & FMODE_WRITE)) 7747 return -EBADF; 7748 } 7749 7750 status = nfs4_set_lock_state(state, request); 7751 if (status != 0) 7752 return status; 7753 7754 return nfs4_retry_setlk(state, cmd, request); 7755 } 7756 7757 static int nfs4_delete_lease(struct file *file, void **priv) 7758 { 7759 return generic_setlease(file, F_UNLCK, NULL, priv); 7760 } 7761 7762 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease, 7763 void **priv) 7764 { 7765 struct inode *inode = file_inode(file); 7766 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7767 int ret; 7768 7769 /* No delegation, no lease */ 7770 if (!nfs4_have_delegation(inode, type, 0)) 7771 return -EAGAIN; 7772 ret = generic_setlease(file, arg, lease, priv); 7773 if (ret || nfs4_have_delegation(inode, type, 0)) 7774 return ret; 7775 /* We raced with a delegation return */ 7776 nfs4_delete_lease(file, priv); 7777 return -EAGAIN; 7778 } 7779 7780 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease, 7781 void **priv) 7782 { 7783 switch (arg) { 7784 case F_RDLCK: 7785 case F_WRLCK: 7786 return nfs4_add_lease(file, arg, lease, priv); 7787 case F_UNLCK: 7788 return nfs4_delete_lease(file, priv); 7789 default: 7790 return -EINVAL; 7791 } 7792 } 7793 7794 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7795 { 7796 struct nfs_server *server = NFS_SERVER(state->inode); 7797 int err; 7798 7799 err = nfs4_set_lock_state(state, fl); 7800 if (err != 0) 7801 return err; 7802 do { 7803 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7804 if (err != -NFS4ERR_DELAY) 7805 break; 7806 ssleep(1); 7807 } while (err == -NFS4ERR_DELAY); 7808 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7809 } 7810 7811 struct nfs_release_lockowner_data { 7812 struct nfs4_lock_state *lsp; 7813 struct nfs_server *server; 7814 struct nfs_release_lockowner_args args; 7815 struct nfs_release_lockowner_res res; 7816 unsigned long timestamp; 7817 }; 7818 7819 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7820 { 7821 struct nfs_release_lockowner_data *data = calldata; 7822 struct nfs_server *server = data->server; 7823 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7824 &data->res.seq_res, task); 7825 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7826 data->timestamp = jiffies; 7827 } 7828 7829 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7830 { 7831 struct nfs_release_lockowner_data *data = calldata; 7832 struct nfs_server *server = data->server; 7833 7834 nfs40_sequence_done(task, &data->res.seq_res); 7835 7836 switch (task->tk_status) { 7837 case 0: 7838 renew_lease(server, data->timestamp); 7839 break; 7840 case -NFS4ERR_STALE_CLIENTID: 7841 case -NFS4ERR_EXPIRED: 7842 nfs4_schedule_lease_recovery(server->nfs_client); 7843 break; 7844 case -NFS4ERR_LEASE_MOVED: 7845 case -NFS4ERR_DELAY: 7846 if (nfs4_async_handle_error(task, server, 7847 NULL, NULL) == -EAGAIN) 7848 rpc_restart_call_prepare(task); 7849 } 7850 } 7851 7852 static void nfs4_release_lockowner_release(void *calldata) 7853 { 7854 struct nfs_release_lockowner_data *data = calldata; 7855 nfs4_free_lock_state(data->server, data->lsp); 7856 kfree(calldata); 7857 } 7858 7859 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7860 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7861 .rpc_call_done = nfs4_release_lockowner_done, 7862 .rpc_release = nfs4_release_lockowner_release, 7863 }; 7864 7865 static void 7866 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7867 { 7868 struct nfs_release_lockowner_data *data; 7869 struct rpc_message msg = { 7870 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7871 }; 7872 7873 if (server->nfs_client->cl_mvops->minor_version != 0) 7874 return; 7875 7876 data = kmalloc(sizeof(*data), GFP_KERNEL); 7877 if (!data) 7878 return; 7879 data->lsp = lsp; 7880 data->server = server; 7881 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7882 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7883 data->args.lock_owner.s_dev = server->s_dev; 7884 7885 msg.rpc_argp = &data->args; 7886 msg.rpc_resp = &data->res; 7887 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7888 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7889 } 7890 7891 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7892 7893 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7894 struct mnt_idmap *idmap, 7895 struct dentry *unused, struct inode *inode, 7896 const char *key, const void *buf, 7897 size_t buflen, int flags) 7898 { 7899 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7900 } 7901 7902 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7903 struct dentry *unused, struct inode *inode, 7904 const char *key, void *buf, size_t buflen) 7905 { 7906 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7907 } 7908 7909 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7910 { 7911 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7912 } 7913 7914 #if defined(CONFIG_NFS_V4_1) 7915 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7916 7917 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7918 struct mnt_idmap *idmap, 7919 struct dentry *unused, struct inode *inode, 7920 const char *key, const void *buf, 7921 size_t buflen, int flags) 7922 { 7923 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7924 } 7925 7926 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7927 struct dentry *unused, struct inode *inode, 7928 const char *key, void *buf, size_t buflen) 7929 { 7930 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7931 } 7932 7933 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7934 { 7935 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7936 } 7937 7938 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7939 7940 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7941 struct mnt_idmap *idmap, 7942 struct dentry *unused, struct inode *inode, 7943 const char *key, const void *buf, 7944 size_t buflen, int flags) 7945 { 7946 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7947 } 7948 7949 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7950 struct dentry *unused, struct inode *inode, 7951 const char *key, void *buf, size_t buflen) 7952 { 7953 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7954 } 7955 7956 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7957 { 7958 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7959 } 7960 7961 #endif 7962 7963 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7964 7965 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7966 struct mnt_idmap *idmap, 7967 struct dentry *unused, struct inode *inode, 7968 const char *key, const void *buf, 7969 size_t buflen, int flags) 7970 { 7971 if (security_ismaclabel(key)) 7972 return nfs4_set_security_label(inode, buf, buflen); 7973 7974 return -EOPNOTSUPP; 7975 } 7976 7977 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7978 struct dentry *unused, struct inode *inode, 7979 const char *key, void *buf, size_t buflen) 7980 { 7981 if (security_ismaclabel(key)) 7982 return nfs4_get_security_label(inode, buf, buflen); 7983 return -EOPNOTSUPP; 7984 } 7985 7986 static ssize_t 7987 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7988 { 7989 int len = 0; 7990 7991 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7992 len = security_inode_listsecurity(inode, list, list_len); 7993 if (len >= 0 && list_len && len > list_len) 7994 return -ERANGE; 7995 } 7996 return len; 7997 } 7998 7999 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 8000 .prefix = XATTR_SECURITY_PREFIX, 8001 .get = nfs4_xattr_get_nfs4_label, 8002 .set = nfs4_xattr_set_nfs4_label, 8003 }; 8004 8005 #else 8006 8007 static ssize_t 8008 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 8009 { 8010 return 0; 8011 } 8012 8013 #endif 8014 8015 #ifdef CONFIG_NFS_V4_2 8016 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 8017 struct mnt_idmap *idmap, 8018 struct dentry *unused, struct inode *inode, 8019 const char *key, const void *buf, 8020 size_t buflen, int flags) 8021 { 8022 u32 mask; 8023 int ret; 8024 8025 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 8026 return -EOPNOTSUPP; 8027 8028 /* 8029 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 8030 * flags right now. Handling of xattr operations use the normal 8031 * file read/write permissions. 8032 * 8033 * Just in case the server has other ideas (which RFC 8276 allows), 8034 * do a cached access check for the XA* flags to possibly avoid 8035 * doing an RPC and getting EACCES back. 8036 */ 8037 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 8038 if (!(mask & NFS_ACCESS_XAWRITE)) 8039 return -EACCES; 8040 } 8041 8042 if (buf == NULL) { 8043 ret = nfs42_proc_removexattr(inode, key); 8044 if (!ret) 8045 nfs4_xattr_cache_remove(inode, key); 8046 } else { 8047 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 8048 if (!ret) 8049 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 8050 } 8051 8052 return ret; 8053 } 8054 8055 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 8056 struct dentry *unused, struct inode *inode, 8057 const char *key, void *buf, size_t buflen) 8058 { 8059 u32 mask; 8060 ssize_t ret; 8061 8062 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 8063 return -EOPNOTSUPP; 8064 8065 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 8066 if (!(mask & NFS_ACCESS_XAREAD)) 8067 return -EACCES; 8068 } 8069 8070 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 8071 if (ret) 8072 return ret; 8073 8074 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 8075 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 8076 return ret; 8077 8078 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 8079 8080 return ret; 8081 } 8082 8083 static ssize_t 8084 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 8085 { 8086 u64 cookie; 8087 bool eof; 8088 ssize_t ret, size; 8089 char *buf; 8090 size_t buflen; 8091 u32 mask; 8092 8093 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 8094 return 0; 8095 8096 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 8097 if (!(mask & NFS_ACCESS_XALIST)) 8098 return 0; 8099 } 8100 8101 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 8102 if (ret) 8103 return ret; 8104 8105 ret = nfs4_xattr_cache_list(inode, list, list_len); 8106 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 8107 return ret; 8108 8109 cookie = 0; 8110 eof = false; 8111 buflen = list_len ? list_len : XATTR_LIST_MAX; 8112 buf = list_len ? list : NULL; 8113 size = 0; 8114 8115 while (!eof) { 8116 ret = nfs42_proc_listxattrs(inode, buf, buflen, 8117 &cookie, &eof); 8118 if (ret < 0) 8119 return ret; 8120 8121 if (list_len) { 8122 buf += ret; 8123 buflen -= ret; 8124 } 8125 size += ret; 8126 } 8127 8128 if (list_len) 8129 nfs4_xattr_cache_set_list(inode, list, size); 8130 8131 return size; 8132 } 8133 8134 #else 8135 8136 static ssize_t 8137 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 8138 { 8139 return 0; 8140 } 8141 #endif /* CONFIG_NFS_V4_2 */ 8142 8143 /* 8144 * nfs_fhget will use either the mounted_on_fileid or the fileid 8145 */ 8146 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 8147 { 8148 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 8149 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 8150 (fattr->valid & NFS_ATTR_FATTR_FSID) && 8151 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 8152 return; 8153 8154 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 8155 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 8156 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 8157 fattr->nlink = 2; 8158 } 8159 8160 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8161 const struct qstr *name, 8162 struct nfs4_fs_locations *fs_locations, 8163 struct page *page) 8164 { 8165 struct nfs_server *server = NFS_SERVER(dir); 8166 u32 bitmask[3]; 8167 struct nfs4_fs_locations_arg args = { 8168 .dir_fh = NFS_FH(dir), 8169 .name = name, 8170 .page = page, 8171 .bitmask = bitmask, 8172 }; 8173 struct nfs4_fs_locations_res res = { 8174 .fs_locations = fs_locations, 8175 }; 8176 struct rpc_message msg = { 8177 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8178 .rpc_argp = &args, 8179 .rpc_resp = &res, 8180 }; 8181 int status; 8182 8183 dprintk("%s: start\n", __func__); 8184 8185 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8186 bitmask[1] = nfs4_fattr_bitmap[1]; 8187 8188 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8189 * is not supported */ 8190 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8191 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8192 else 8193 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8194 8195 nfs_fattr_init(fs_locations->fattr); 8196 fs_locations->server = server; 8197 fs_locations->nlocations = 0; 8198 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8199 dprintk("%s: returned status = %d\n", __func__, status); 8200 return status; 8201 } 8202 8203 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8204 const struct qstr *name, 8205 struct nfs4_fs_locations *fs_locations, 8206 struct page *page) 8207 { 8208 struct nfs4_exception exception = { 8209 .interruptible = true, 8210 }; 8211 int err; 8212 do { 8213 err = _nfs4_proc_fs_locations(client, dir, name, 8214 fs_locations, page); 8215 trace_nfs4_get_fs_locations(dir, name, err); 8216 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8217 &exception); 8218 } while (exception.retry); 8219 return err; 8220 } 8221 8222 /* 8223 * This operation also signals the server that this client is 8224 * performing migration recovery. The server can stop returning 8225 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8226 * appended to this compound to identify the client ID which is 8227 * performing recovery. 8228 */ 8229 static int _nfs40_proc_get_locations(struct nfs_server *server, 8230 struct nfs_fh *fhandle, 8231 struct nfs4_fs_locations *locations, 8232 struct page *page, const struct cred *cred) 8233 { 8234 struct rpc_clnt *clnt = server->client; 8235 u32 bitmask[2] = { 8236 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8237 }; 8238 struct nfs4_fs_locations_arg args = { 8239 .clientid = server->nfs_client->cl_clientid, 8240 .fh = fhandle, 8241 .page = page, 8242 .bitmask = bitmask, 8243 .migration = 1, /* skip LOOKUP */ 8244 .renew = 1, /* append RENEW */ 8245 }; 8246 struct nfs4_fs_locations_res res = { 8247 .fs_locations = locations, 8248 .migration = 1, 8249 .renew = 1, 8250 }; 8251 struct rpc_message msg = { 8252 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8253 .rpc_argp = &args, 8254 .rpc_resp = &res, 8255 .rpc_cred = cred, 8256 }; 8257 unsigned long now = jiffies; 8258 int status; 8259 8260 nfs_fattr_init(locations->fattr); 8261 locations->server = server; 8262 locations->nlocations = 0; 8263 8264 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8265 status = nfs4_call_sync_sequence(clnt, server, &msg, 8266 &args.seq_args, &res.seq_res); 8267 if (status) 8268 return status; 8269 8270 renew_lease(server, now); 8271 return 0; 8272 } 8273 8274 #ifdef CONFIG_NFS_V4_1 8275 8276 /* 8277 * This operation also signals the server that this client is 8278 * performing migration recovery. The server can stop asserting 8279 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8280 * performing this operation is identified in the SEQUENCE 8281 * operation in this compound. 8282 * 8283 * When the client supports GETATTR(fs_locations_info), it can 8284 * be plumbed in here. 8285 */ 8286 static int _nfs41_proc_get_locations(struct nfs_server *server, 8287 struct nfs_fh *fhandle, 8288 struct nfs4_fs_locations *locations, 8289 struct page *page, const struct cred *cred) 8290 { 8291 struct rpc_clnt *clnt = server->client; 8292 u32 bitmask[2] = { 8293 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8294 }; 8295 struct nfs4_fs_locations_arg args = { 8296 .fh = fhandle, 8297 .page = page, 8298 .bitmask = bitmask, 8299 .migration = 1, /* skip LOOKUP */ 8300 }; 8301 struct nfs4_fs_locations_res res = { 8302 .fs_locations = locations, 8303 .migration = 1, 8304 }; 8305 struct rpc_message msg = { 8306 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8307 .rpc_argp = &args, 8308 .rpc_resp = &res, 8309 .rpc_cred = cred, 8310 }; 8311 struct nfs4_call_sync_data data = { 8312 .seq_server = server, 8313 .seq_args = &args.seq_args, 8314 .seq_res = &res.seq_res, 8315 }; 8316 struct rpc_task_setup task_setup_data = { 8317 .rpc_client = clnt, 8318 .rpc_message = &msg, 8319 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8320 .callback_data = &data, 8321 .flags = RPC_TASK_NO_ROUND_ROBIN, 8322 }; 8323 int status; 8324 8325 nfs_fattr_init(locations->fattr); 8326 locations->server = server; 8327 locations->nlocations = 0; 8328 8329 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8330 status = nfs4_call_sync_custom(&task_setup_data); 8331 if (status == NFS4_OK && 8332 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8333 status = -NFS4ERR_LEASE_MOVED; 8334 return status; 8335 } 8336 8337 #endif /* CONFIG_NFS_V4_1 */ 8338 8339 /** 8340 * nfs4_proc_get_locations - discover locations for a migrated FSID 8341 * @server: pointer to nfs_server to process 8342 * @fhandle: pointer to the kernel NFS client file handle 8343 * @locations: result of query 8344 * @page: buffer 8345 * @cred: credential to use for this operation 8346 * 8347 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8348 * operation failed, or a negative errno if a local error occurred. 8349 * 8350 * On success, "locations" is filled in, but if the server has 8351 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8352 * asserted. 8353 * 8354 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8355 * from this client that require migration recovery. 8356 */ 8357 int nfs4_proc_get_locations(struct nfs_server *server, 8358 struct nfs_fh *fhandle, 8359 struct nfs4_fs_locations *locations, 8360 struct page *page, const struct cred *cred) 8361 { 8362 struct nfs_client *clp = server->nfs_client; 8363 const struct nfs4_mig_recovery_ops *ops = 8364 clp->cl_mvops->mig_recovery_ops; 8365 struct nfs4_exception exception = { 8366 .interruptible = true, 8367 }; 8368 int status; 8369 8370 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8371 (unsigned long long)server->fsid.major, 8372 (unsigned long long)server->fsid.minor, 8373 clp->cl_hostname); 8374 nfs_display_fhandle(fhandle, __func__); 8375 8376 do { 8377 status = ops->get_locations(server, fhandle, locations, page, 8378 cred); 8379 if (status != -NFS4ERR_DELAY) 8380 break; 8381 nfs4_handle_exception(server, status, &exception); 8382 } while (exception.retry); 8383 return status; 8384 } 8385 8386 /* 8387 * This operation also signals the server that this client is 8388 * performing "lease moved" recovery. The server can stop 8389 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8390 * is appended to this compound to identify the client ID which is 8391 * performing recovery. 8392 */ 8393 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8394 { 8395 struct nfs_server *server = NFS_SERVER(inode); 8396 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8397 struct rpc_clnt *clnt = server->client; 8398 struct nfs4_fsid_present_arg args = { 8399 .fh = NFS_FH(inode), 8400 .clientid = clp->cl_clientid, 8401 .renew = 1, /* append RENEW */ 8402 }; 8403 struct nfs4_fsid_present_res res = { 8404 .renew = 1, 8405 }; 8406 struct rpc_message msg = { 8407 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8408 .rpc_argp = &args, 8409 .rpc_resp = &res, 8410 .rpc_cred = cred, 8411 }; 8412 unsigned long now = jiffies; 8413 int status; 8414 8415 res.fh = nfs_alloc_fhandle(); 8416 if (res.fh == NULL) 8417 return -ENOMEM; 8418 8419 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8420 status = nfs4_call_sync_sequence(clnt, server, &msg, 8421 &args.seq_args, &res.seq_res); 8422 nfs_free_fhandle(res.fh); 8423 if (status) 8424 return status; 8425 8426 do_renew_lease(clp, now); 8427 return 0; 8428 } 8429 8430 #ifdef CONFIG_NFS_V4_1 8431 8432 /* 8433 * This operation also signals the server that this client is 8434 * performing "lease moved" recovery. The server can stop asserting 8435 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8436 * this operation is identified in the SEQUENCE operation in this 8437 * compound. 8438 */ 8439 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8440 { 8441 struct nfs_server *server = NFS_SERVER(inode); 8442 struct rpc_clnt *clnt = server->client; 8443 struct nfs4_fsid_present_arg args = { 8444 .fh = NFS_FH(inode), 8445 }; 8446 struct nfs4_fsid_present_res res = { 8447 }; 8448 struct rpc_message msg = { 8449 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8450 .rpc_argp = &args, 8451 .rpc_resp = &res, 8452 .rpc_cred = cred, 8453 }; 8454 int status; 8455 8456 res.fh = nfs_alloc_fhandle(); 8457 if (res.fh == NULL) 8458 return -ENOMEM; 8459 8460 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8461 status = nfs4_call_sync_sequence(clnt, server, &msg, 8462 &args.seq_args, &res.seq_res); 8463 nfs_free_fhandle(res.fh); 8464 if (status == NFS4_OK && 8465 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8466 status = -NFS4ERR_LEASE_MOVED; 8467 return status; 8468 } 8469 8470 #endif /* CONFIG_NFS_V4_1 */ 8471 8472 /** 8473 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8474 * @inode: inode on FSID to check 8475 * @cred: credential to use for this operation 8476 * 8477 * Server indicates whether the FSID is present, moved, or not 8478 * recognized. This operation is necessary to clear a LEASE_MOVED 8479 * condition for this client ID. 8480 * 8481 * Returns NFS4_OK if the FSID is present on this server, 8482 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8483 * NFS4ERR code if some error occurred on the server, or a 8484 * negative errno if a local failure occurred. 8485 */ 8486 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8487 { 8488 struct nfs_server *server = NFS_SERVER(inode); 8489 struct nfs_client *clp = server->nfs_client; 8490 const struct nfs4_mig_recovery_ops *ops = 8491 clp->cl_mvops->mig_recovery_ops; 8492 struct nfs4_exception exception = { 8493 .interruptible = true, 8494 }; 8495 int status; 8496 8497 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8498 (unsigned long long)server->fsid.major, 8499 (unsigned long long)server->fsid.minor, 8500 clp->cl_hostname); 8501 nfs_display_fhandle(NFS_FH(inode), __func__); 8502 8503 do { 8504 status = ops->fsid_present(inode, cred); 8505 if (status != -NFS4ERR_DELAY) 8506 break; 8507 nfs4_handle_exception(server, status, &exception); 8508 } while (exception.retry); 8509 return status; 8510 } 8511 8512 /* 8513 * If 'use_integrity' is true and the state managment nfs_client 8514 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8515 * and the machine credential as per RFC3530bis and RFC5661 Security 8516 * Considerations sections. Otherwise, just use the user cred with the 8517 * filesystem's rpc_client. 8518 */ 8519 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8520 { 8521 int status; 8522 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8523 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8524 struct nfs4_secinfo_arg args = { 8525 .dir_fh = NFS_FH(dir), 8526 .name = name, 8527 }; 8528 struct nfs4_secinfo_res res = { 8529 .flavors = flavors, 8530 }; 8531 struct rpc_message msg = { 8532 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8533 .rpc_argp = &args, 8534 .rpc_resp = &res, 8535 }; 8536 struct nfs4_call_sync_data data = { 8537 .seq_server = NFS_SERVER(dir), 8538 .seq_args = &args.seq_args, 8539 .seq_res = &res.seq_res, 8540 }; 8541 struct rpc_task_setup task_setup = { 8542 .rpc_client = clnt, 8543 .rpc_message = &msg, 8544 .callback_ops = clp->cl_mvops->call_sync_ops, 8545 .callback_data = &data, 8546 .flags = RPC_TASK_NO_ROUND_ROBIN, 8547 }; 8548 const struct cred *cred = NULL; 8549 8550 if (use_integrity) { 8551 clnt = clp->cl_rpcclient; 8552 task_setup.rpc_client = clnt; 8553 8554 cred = nfs4_get_clid_cred(clp); 8555 msg.rpc_cred = cred; 8556 } 8557 8558 dprintk("NFS call secinfo %s\n", name->name); 8559 8560 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8561 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8562 status = nfs4_call_sync_custom(&task_setup); 8563 8564 dprintk("NFS reply secinfo: %d\n", status); 8565 8566 put_cred(cred); 8567 return status; 8568 } 8569 8570 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8571 struct nfs4_secinfo_flavors *flavors) 8572 { 8573 struct nfs4_exception exception = { 8574 .interruptible = true, 8575 }; 8576 int err; 8577 do { 8578 err = -NFS4ERR_WRONGSEC; 8579 8580 /* try to use integrity protection with machine cred */ 8581 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8582 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8583 8584 /* 8585 * if unable to use integrity protection, or SECINFO with 8586 * integrity protection returns NFS4ERR_WRONGSEC (which is 8587 * disallowed by spec, but exists in deployed servers) use 8588 * the current filesystem's rpc_client and the user cred. 8589 */ 8590 if (err == -NFS4ERR_WRONGSEC) 8591 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8592 8593 trace_nfs4_secinfo(dir, name, err); 8594 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8595 &exception); 8596 } while (exception.retry); 8597 return err; 8598 } 8599 8600 #ifdef CONFIG_NFS_V4_1 8601 /* 8602 * Check the exchange flags returned by the server for invalid flags, having 8603 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8604 * DS flags set. 8605 */ 8606 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8607 { 8608 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8609 goto out_inval; 8610 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8611 goto out_inval; 8612 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8613 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8614 goto out_inval; 8615 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8616 goto out_inval; 8617 return NFS_OK; 8618 out_inval: 8619 return -NFS4ERR_INVAL; 8620 } 8621 8622 static bool 8623 nfs41_same_server_scope(struct nfs41_server_scope *a, 8624 struct nfs41_server_scope *b) 8625 { 8626 if (a->server_scope_sz != b->server_scope_sz) 8627 return false; 8628 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8629 } 8630 8631 static void 8632 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8633 { 8634 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8635 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8636 struct nfs_client *clp = args->client; 8637 8638 switch (task->tk_status) { 8639 case -NFS4ERR_BADSESSION: 8640 case -NFS4ERR_DEADSESSION: 8641 nfs4_schedule_session_recovery(clp->cl_session, 8642 task->tk_status); 8643 return; 8644 } 8645 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8646 res->dir != NFS4_CDFS4_BOTH) { 8647 rpc_task_close_connection(task); 8648 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8649 rpc_restart_call(task); 8650 } 8651 } 8652 8653 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8654 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8655 }; 8656 8657 /* 8658 * nfs4_proc_bind_one_conn_to_session() 8659 * 8660 * The 4.1 client currently uses the same TCP connection for the 8661 * fore and backchannel. 8662 */ 8663 static 8664 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8665 struct rpc_xprt *xprt, 8666 struct nfs_client *clp, 8667 const struct cred *cred) 8668 { 8669 int status; 8670 struct nfs41_bind_conn_to_session_args args = { 8671 .client = clp, 8672 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8673 .retries = 0, 8674 }; 8675 struct nfs41_bind_conn_to_session_res res; 8676 struct rpc_message msg = { 8677 .rpc_proc = 8678 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8679 .rpc_argp = &args, 8680 .rpc_resp = &res, 8681 .rpc_cred = cred, 8682 }; 8683 struct rpc_task_setup task_setup_data = { 8684 .rpc_client = clnt, 8685 .rpc_xprt = xprt, 8686 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8687 .rpc_message = &msg, 8688 .flags = RPC_TASK_TIMEOUT, 8689 }; 8690 struct rpc_task *task; 8691 8692 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8693 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8694 args.dir = NFS4_CDFC4_FORE; 8695 8696 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8697 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8698 args.dir = NFS4_CDFC4_FORE; 8699 8700 task = rpc_run_task(&task_setup_data); 8701 if (!IS_ERR(task)) { 8702 status = task->tk_status; 8703 rpc_put_task(task); 8704 } else 8705 status = PTR_ERR(task); 8706 trace_nfs4_bind_conn_to_session(clp, status); 8707 if (status == 0) { 8708 if (memcmp(res.sessionid.data, 8709 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8710 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8711 return -EIO; 8712 } 8713 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8714 dprintk("NFS: %s: Unexpected direction from server\n", 8715 __func__); 8716 return -EIO; 8717 } 8718 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8719 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8720 __func__); 8721 return -EIO; 8722 } 8723 } 8724 8725 return status; 8726 } 8727 8728 struct rpc_bind_conn_calldata { 8729 struct nfs_client *clp; 8730 const struct cred *cred; 8731 }; 8732 8733 static int 8734 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8735 struct rpc_xprt *xprt, 8736 void *calldata) 8737 { 8738 struct rpc_bind_conn_calldata *p = calldata; 8739 8740 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8741 } 8742 8743 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8744 { 8745 struct rpc_bind_conn_calldata data = { 8746 .clp = clp, 8747 .cred = cred, 8748 }; 8749 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8750 nfs4_proc_bind_conn_to_session_callback, &data); 8751 } 8752 8753 /* 8754 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8755 * and operations we'd like to see to enable certain features in the allow map 8756 */ 8757 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8758 .how = SP4_MACH_CRED, 8759 .enforce.u.words = { 8760 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8761 1 << (OP_EXCHANGE_ID - 32) | 8762 1 << (OP_CREATE_SESSION - 32) | 8763 1 << (OP_DESTROY_SESSION - 32) | 8764 1 << (OP_DESTROY_CLIENTID - 32) 8765 }, 8766 .allow.u.words = { 8767 [0] = 1 << (OP_CLOSE) | 8768 1 << (OP_OPEN_DOWNGRADE) | 8769 1 << (OP_LOCKU) | 8770 1 << (OP_DELEGRETURN) | 8771 1 << (OP_COMMIT), 8772 [1] = 1 << (OP_SECINFO - 32) | 8773 1 << (OP_SECINFO_NO_NAME - 32) | 8774 1 << (OP_LAYOUTRETURN - 32) | 8775 1 << (OP_TEST_STATEID - 32) | 8776 1 << (OP_FREE_STATEID - 32) | 8777 1 << (OP_WRITE - 32) 8778 } 8779 }; 8780 8781 /* 8782 * Select the state protection mode for client `clp' given the server results 8783 * from exchange_id in `sp'. 8784 * 8785 * Returns 0 on success, negative errno otherwise. 8786 */ 8787 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8788 struct nfs41_state_protection *sp) 8789 { 8790 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8791 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8792 1 << (OP_EXCHANGE_ID - 32) | 8793 1 << (OP_CREATE_SESSION - 32) | 8794 1 << (OP_DESTROY_SESSION - 32) | 8795 1 << (OP_DESTROY_CLIENTID - 32) 8796 }; 8797 unsigned long flags = 0; 8798 unsigned int i; 8799 int ret = 0; 8800 8801 if (sp->how == SP4_MACH_CRED) { 8802 /* Print state protect result */ 8803 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8804 for (i = 0; i <= LAST_NFS4_OP; i++) { 8805 if (test_bit(i, sp->enforce.u.longs)) 8806 dfprintk(MOUNT, " enforce op %d\n", i); 8807 if (test_bit(i, sp->allow.u.longs)) 8808 dfprintk(MOUNT, " allow op %d\n", i); 8809 } 8810 8811 /* make sure nothing is on enforce list that isn't supported */ 8812 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8813 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8814 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8815 ret = -EINVAL; 8816 goto out; 8817 } 8818 } 8819 8820 /* 8821 * Minimal mode - state operations are allowed to use machine 8822 * credential. Note this already happens by default, so the 8823 * client doesn't have to do anything more than the negotiation. 8824 * 8825 * NOTE: we don't care if EXCHANGE_ID is in the list - 8826 * we're already using the machine cred for exchange_id 8827 * and will never use a different cred. 8828 */ 8829 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8830 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8831 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8832 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8833 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8834 dfprintk(MOUNT, " minimal mode enabled\n"); 8835 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8836 } else { 8837 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8838 ret = -EINVAL; 8839 goto out; 8840 } 8841 8842 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8843 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8844 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8845 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8846 dfprintk(MOUNT, " cleanup mode enabled\n"); 8847 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8848 } 8849 8850 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8851 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8852 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8853 } 8854 8855 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8856 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8857 dfprintk(MOUNT, " secinfo mode enabled\n"); 8858 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8859 } 8860 8861 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8862 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8863 dfprintk(MOUNT, " stateid mode enabled\n"); 8864 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8865 } 8866 8867 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8868 dfprintk(MOUNT, " write mode enabled\n"); 8869 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8870 } 8871 8872 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8873 dfprintk(MOUNT, " commit mode enabled\n"); 8874 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8875 } 8876 } 8877 out: 8878 clp->cl_sp4_flags = flags; 8879 return ret; 8880 } 8881 8882 struct nfs41_exchange_id_data { 8883 struct nfs41_exchange_id_res res; 8884 struct nfs41_exchange_id_args args; 8885 }; 8886 8887 static void nfs4_exchange_id_release(void *data) 8888 { 8889 struct nfs41_exchange_id_data *cdata = 8890 (struct nfs41_exchange_id_data *)data; 8891 8892 nfs_put_client(cdata->args.client); 8893 kfree(cdata->res.impl_id); 8894 kfree(cdata->res.server_scope); 8895 kfree(cdata->res.server_owner); 8896 kfree(cdata); 8897 } 8898 8899 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8900 .rpc_release = nfs4_exchange_id_release, 8901 }; 8902 8903 /* 8904 * _nfs4_proc_exchange_id() 8905 * 8906 * Wrapper for EXCHANGE_ID operation. 8907 */ 8908 static struct rpc_task * 8909 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8910 u32 sp4_how, struct rpc_xprt *xprt) 8911 { 8912 struct rpc_message msg = { 8913 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8914 .rpc_cred = cred, 8915 }; 8916 struct rpc_task_setup task_setup_data = { 8917 .rpc_client = clp->cl_rpcclient, 8918 .callback_ops = &nfs4_exchange_id_call_ops, 8919 .rpc_message = &msg, 8920 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8921 }; 8922 struct nfs41_exchange_id_data *calldata; 8923 int status; 8924 8925 if (!refcount_inc_not_zero(&clp->cl_count)) 8926 return ERR_PTR(-EIO); 8927 8928 status = -ENOMEM; 8929 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8930 if (!calldata) 8931 goto out; 8932 8933 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8934 8935 status = nfs4_init_uniform_client_string(clp); 8936 if (status) 8937 goto out_calldata; 8938 8939 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8940 GFP_NOFS); 8941 status = -ENOMEM; 8942 if (unlikely(calldata->res.server_owner == NULL)) 8943 goto out_calldata; 8944 8945 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8946 GFP_NOFS); 8947 if (unlikely(calldata->res.server_scope == NULL)) 8948 goto out_server_owner; 8949 8950 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8951 if (unlikely(calldata->res.impl_id == NULL)) 8952 goto out_server_scope; 8953 8954 switch (sp4_how) { 8955 case SP4_NONE: 8956 calldata->args.state_protect.how = SP4_NONE; 8957 break; 8958 8959 case SP4_MACH_CRED: 8960 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8961 break; 8962 8963 default: 8964 /* unsupported! */ 8965 WARN_ON_ONCE(1); 8966 status = -EINVAL; 8967 goto out_impl_id; 8968 } 8969 if (xprt) { 8970 task_setup_data.rpc_xprt = xprt; 8971 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8972 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8973 sizeof(calldata->args.verifier.data)); 8974 } 8975 calldata->args.client = clp; 8976 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8977 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8978 #ifdef CONFIG_NFS_V4_1_MIGRATION 8979 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8980 #endif 8981 if (test_bit(NFS_CS_PNFS, &clp->cl_flags)) 8982 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8983 msg.rpc_argp = &calldata->args; 8984 msg.rpc_resp = &calldata->res; 8985 task_setup_data.callback_data = calldata; 8986 8987 return rpc_run_task(&task_setup_data); 8988 8989 out_impl_id: 8990 kfree(calldata->res.impl_id); 8991 out_server_scope: 8992 kfree(calldata->res.server_scope); 8993 out_server_owner: 8994 kfree(calldata->res.server_owner); 8995 out_calldata: 8996 kfree(calldata); 8997 out: 8998 nfs_put_client(clp); 8999 return ERR_PTR(status); 9000 } 9001 9002 /* 9003 * _nfs4_proc_exchange_id() 9004 * 9005 * Wrapper for EXCHANGE_ID operation. 9006 */ 9007 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 9008 u32 sp4_how) 9009 { 9010 struct rpc_task *task; 9011 struct nfs41_exchange_id_args *argp; 9012 struct nfs41_exchange_id_res *resp; 9013 unsigned long now = jiffies; 9014 int status; 9015 9016 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 9017 if (IS_ERR(task)) 9018 return PTR_ERR(task); 9019 9020 argp = task->tk_msg.rpc_argp; 9021 resp = task->tk_msg.rpc_resp; 9022 status = task->tk_status; 9023 if (status != 0) 9024 goto out; 9025 9026 status = nfs4_check_cl_exchange_flags(resp->flags, 9027 clp->cl_mvops->minor_version); 9028 if (status != 0) 9029 goto out; 9030 9031 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 9032 if (status != 0) 9033 goto out; 9034 9035 do_renew_lease(clp, now); 9036 9037 clp->cl_clientid = resp->clientid; 9038 clp->cl_exchange_flags = resp->flags; 9039 clp->cl_seqid = resp->seqid; 9040 /* Client ID is not confirmed */ 9041 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 9042 clear_bit(NFS4_SESSION_ESTABLISHED, 9043 &clp->cl_session->session_state); 9044 9045 if (clp->cl_serverscope != NULL && 9046 !nfs41_same_server_scope(clp->cl_serverscope, 9047 resp->server_scope)) { 9048 dprintk("%s: server_scope mismatch detected\n", 9049 __func__); 9050 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 9051 } 9052 9053 swap(clp->cl_serverowner, resp->server_owner); 9054 swap(clp->cl_serverscope, resp->server_scope); 9055 swap(clp->cl_implid, resp->impl_id); 9056 9057 /* Save the EXCHANGE_ID verifier session trunk tests */ 9058 memcpy(clp->cl_confirm.data, argp->verifier.data, 9059 sizeof(clp->cl_confirm.data)); 9060 out: 9061 trace_nfs4_exchange_id(clp, status); 9062 rpc_put_task(task); 9063 return status; 9064 } 9065 9066 /* 9067 * nfs4_proc_exchange_id() 9068 * 9069 * Returns zero, a negative errno, or a negative NFS4ERR status code. 9070 * 9071 * Since the clientid has expired, all compounds using sessions 9072 * associated with the stale clientid will be returning 9073 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 9074 * be in some phase of session reset. 9075 * 9076 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 9077 */ 9078 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 9079 { 9080 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 9081 int status; 9082 9083 /* try SP4_MACH_CRED if krb5i/p */ 9084 if (authflavor == RPC_AUTH_GSS_KRB5I || 9085 authflavor == RPC_AUTH_GSS_KRB5P) { 9086 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 9087 if (!status) 9088 return 0; 9089 } 9090 9091 /* try SP4_NONE */ 9092 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 9093 } 9094 9095 /** 9096 * nfs4_test_session_trunk 9097 * 9098 * This is an add_xprt_test() test function called from 9099 * rpc_clnt_setup_test_and_add_xprt. 9100 * 9101 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 9102 * and is dereferrenced in nfs4_exchange_id_release 9103 * 9104 * Upon success, add the new transport to the rpc_clnt 9105 * 9106 * @clnt: struct rpc_clnt to get new transport 9107 * @xprt: the rpc_xprt to test 9108 * @data: call data for _nfs4_proc_exchange_id. 9109 */ 9110 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 9111 void *data) 9112 { 9113 struct nfs4_add_xprt_data *adata = data; 9114 struct rpc_task *task; 9115 int status; 9116 9117 u32 sp4_how; 9118 9119 dprintk("--> %s try %s\n", __func__, 9120 xprt->address_strings[RPC_DISPLAY_ADDR]); 9121 9122 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 9123 9124 try_again: 9125 /* Test connection for session trunking. Async exchange_id call */ 9126 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 9127 if (IS_ERR(task)) 9128 return; 9129 9130 status = task->tk_status; 9131 if (status == 0) { 9132 status = nfs4_detect_session_trunking(adata->clp, 9133 task->tk_msg.rpc_resp, xprt); 9134 trace_nfs4_trunked_exchange_id(adata->clp, 9135 xprt->address_strings[RPC_DISPLAY_ADDR], status); 9136 } 9137 if (status == 0) 9138 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 9139 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt, 9140 (struct sockaddr *)&xprt->addr)) 9141 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 9142 9143 rpc_put_task(task); 9144 if (status == -NFS4ERR_DELAY) { 9145 ssleep(1); 9146 goto try_again; 9147 } 9148 } 9149 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 9150 9151 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 9152 const struct cred *cred) 9153 { 9154 struct rpc_message msg = { 9155 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 9156 .rpc_argp = clp, 9157 .rpc_cred = cred, 9158 }; 9159 int status; 9160 9161 status = rpc_call_sync(clp->cl_rpcclient, &msg, 9162 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9163 trace_nfs4_destroy_clientid(clp, status); 9164 if (status) 9165 dprintk("NFS: Got error %d from the server %s on " 9166 "DESTROY_CLIENTID.", status, clp->cl_hostname); 9167 return status; 9168 } 9169 9170 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 9171 const struct cred *cred) 9172 { 9173 unsigned int loop; 9174 int ret; 9175 9176 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 9177 ret = _nfs4_proc_destroy_clientid(clp, cred); 9178 switch (ret) { 9179 case -NFS4ERR_DELAY: 9180 case -NFS4ERR_CLIENTID_BUSY: 9181 ssleep(1); 9182 break; 9183 default: 9184 return ret; 9185 } 9186 } 9187 return 0; 9188 } 9189 9190 int nfs4_destroy_clientid(struct nfs_client *clp) 9191 { 9192 const struct cred *cred; 9193 int ret = 0; 9194 9195 if (clp->cl_mvops->minor_version < 1) 9196 goto out; 9197 if (clp->cl_exchange_flags == 0) 9198 goto out; 9199 if (clp->cl_preserve_clid) 9200 goto out; 9201 cred = nfs4_get_clid_cred(clp); 9202 ret = nfs4_proc_destroy_clientid(clp, cred); 9203 put_cred(cred); 9204 switch (ret) { 9205 case 0: 9206 case -NFS4ERR_STALE_CLIENTID: 9207 clp->cl_exchange_flags = 0; 9208 } 9209 out: 9210 return ret; 9211 } 9212 9213 #endif /* CONFIG_NFS_V4_1 */ 9214 9215 struct nfs4_get_lease_time_data { 9216 struct nfs4_get_lease_time_args *args; 9217 struct nfs4_get_lease_time_res *res; 9218 struct nfs_client *clp; 9219 }; 9220 9221 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9222 void *calldata) 9223 { 9224 struct nfs4_get_lease_time_data *data = 9225 (struct nfs4_get_lease_time_data *)calldata; 9226 9227 /* just setup sequence, do not trigger session recovery 9228 since we're invoked within one */ 9229 nfs4_setup_sequence(data->clp, 9230 &data->args->la_seq_args, 9231 &data->res->lr_seq_res, 9232 task); 9233 } 9234 9235 /* 9236 * Called from nfs4_state_manager thread for session setup, so don't recover 9237 * from sequence operation or clientid errors. 9238 */ 9239 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9240 { 9241 struct nfs4_get_lease_time_data *data = 9242 (struct nfs4_get_lease_time_data *)calldata; 9243 9244 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9245 return; 9246 switch (task->tk_status) { 9247 case -NFS4ERR_DELAY: 9248 case -NFS4ERR_GRACE: 9249 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9250 task->tk_status = 0; 9251 fallthrough; 9252 case -NFS4ERR_RETRY_UNCACHED_REP: 9253 rpc_restart_call_prepare(task); 9254 return; 9255 } 9256 } 9257 9258 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9259 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9260 .rpc_call_done = nfs4_get_lease_time_done, 9261 }; 9262 9263 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9264 { 9265 struct nfs4_get_lease_time_args args; 9266 struct nfs4_get_lease_time_res res = { 9267 .lr_fsinfo = fsinfo, 9268 }; 9269 struct nfs4_get_lease_time_data data = { 9270 .args = &args, 9271 .res = &res, 9272 .clp = clp, 9273 }; 9274 struct rpc_message msg = { 9275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9276 .rpc_argp = &args, 9277 .rpc_resp = &res, 9278 }; 9279 struct rpc_task_setup task_setup = { 9280 .rpc_client = clp->cl_rpcclient, 9281 .rpc_message = &msg, 9282 .callback_ops = &nfs4_get_lease_time_ops, 9283 .callback_data = &data, 9284 .flags = RPC_TASK_TIMEOUT, 9285 }; 9286 9287 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9288 return nfs4_call_sync_custom(&task_setup); 9289 } 9290 9291 #ifdef CONFIG_NFS_V4_1 9292 9293 /* 9294 * Initialize the values to be used by the client in CREATE_SESSION 9295 * If nfs4_init_session set the fore channel request and response sizes, 9296 * use them. 9297 * 9298 * Set the back channel max_resp_sz_cached to zero to force the client to 9299 * always set csa_cachethis to FALSE because the current implementation 9300 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9301 */ 9302 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9303 struct rpc_clnt *clnt) 9304 { 9305 unsigned int max_rqst_sz, max_resp_sz; 9306 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9307 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9308 9309 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9310 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9311 9312 /* Fore channel attributes */ 9313 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9314 args->fc_attrs.max_resp_sz = max_resp_sz; 9315 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9316 args->fc_attrs.max_reqs = max_session_slots; 9317 9318 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9319 "max_ops=%u max_reqs=%u\n", 9320 __func__, 9321 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9322 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9323 9324 /* Back channel attributes */ 9325 args->bc_attrs.max_rqst_sz = max_bc_payload; 9326 args->bc_attrs.max_resp_sz = max_bc_payload; 9327 args->bc_attrs.max_resp_sz_cached = 0; 9328 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9329 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9330 if (args->bc_attrs.max_reqs > max_bc_slots) 9331 args->bc_attrs.max_reqs = max_bc_slots; 9332 9333 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9334 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9335 __func__, 9336 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9337 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9338 args->bc_attrs.max_reqs); 9339 } 9340 9341 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9342 struct nfs41_create_session_res *res) 9343 { 9344 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9345 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9346 9347 if (rcvd->max_resp_sz > sent->max_resp_sz) 9348 return -EINVAL; 9349 /* 9350 * Our requested max_ops is the minimum we need; we're not 9351 * prepared to break up compounds into smaller pieces than that. 9352 * So, no point even trying to continue if the server won't 9353 * cooperate: 9354 */ 9355 if (rcvd->max_ops < sent->max_ops) 9356 return -EINVAL; 9357 if (rcvd->max_reqs == 0) 9358 return -EINVAL; 9359 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9360 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9361 return 0; 9362 } 9363 9364 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9365 struct nfs41_create_session_res *res) 9366 { 9367 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9368 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9369 9370 if (!(res->flags & SESSION4_BACK_CHAN)) 9371 goto out; 9372 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9373 return -EINVAL; 9374 if (rcvd->max_resp_sz < sent->max_resp_sz) 9375 return -EINVAL; 9376 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9377 return -EINVAL; 9378 if (rcvd->max_ops > sent->max_ops) 9379 return -EINVAL; 9380 if (rcvd->max_reqs > sent->max_reqs) 9381 return -EINVAL; 9382 out: 9383 return 0; 9384 } 9385 9386 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9387 struct nfs41_create_session_res *res) 9388 { 9389 int ret; 9390 9391 ret = nfs4_verify_fore_channel_attrs(args, res); 9392 if (ret) 9393 return ret; 9394 return nfs4_verify_back_channel_attrs(args, res); 9395 } 9396 9397 static void nfs4_update_session(struct nfs4_session *session, 9398 struct nfs41_create_session_res *res) 9399 { 9400 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9401 /* Mark client id and session as being confirmed */ 9402 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9403 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9404 session->flags = res->flags; 9405 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9406 if (res->flags & SESSION4_BACK_CHAN) 9407 memcpy(&session->bc_attrs, &res->bc_attrs, 9408 sizeof(session->bc_attrs)); 9409 } 9410 9411 static int _nfs4_proc_create_session(struct nfs_client *clp, 9412 const struct cred *cred) 9413 { 9414 struct nfs4_session *session = clp->cl_session; 9415 struct nfs41_create_session_args args = { 9416 .client = clp, 9417 .clientid = clp->cl_clientid, 9418 .seqid = clp->cl_seqid, 9419 .cb_program = NFS4_CALLBACK, 9420 }; 9421 struct nfs41_create_session_res res; 9422 9423 struct rpc_message msg = { 9424 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9425 .rpc_argp = &args, 9426 .rpc_resp = &res, 9427 .rpc_cred = cred, 9428 }; 9429 int status; 9430 9431 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9432 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9433 9434 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9435 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9436 trace_nfs4_create_session(clp, status); 9437 9438 switch (status) { 9439 case -NFS4ERR_STALE_CLIENTID: 9440 case -NFS4ERR_DELAY: 9441 case -ETIMEDOUT: 9442 case -EACCES: 9443 case -EAGAIN: 9444 goto out; 9445 } 9446 9447 clp->cl_seqid++; 9448 if (!status) { 9449 /* Verify the session's negotiated channel_attrs values */ 9450 status = nfs4_verify_channel_attrs(&args, &res); 9451 /* Increment the clientid slot sequence id */ 9452 if (status) 9453 goto out; 9454 nfs4_update_session(session, &res); 9455 } 9456 out: 9457 return status; 9458 } 9459 9460 /* 9461 * Issues a CREATE_SESSION operation to the server. 9462 * It is the responsibility of the caller to verify the session is 9463 * expired before calling this routine. 9464 */ 9465 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9466 { 9467 int status; 9468 unsigned *ptr; 9469 struct nfs4_session *session = clp->cl_session; 9470 struct nfs4_add_xprt_data xprtdata = { 9471 .clp = clp, 9472 }; 9473 struct rpc_add_xprt_test rpcdata = { 9474 .add_xprt_test = clp->cl_mvops->session_trunk, 9475 .data = &xprtdata, 9476 }; 9477 9478 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9479 9480 status = _nfs4_proc_create_session(clp, cred); 9481 if (status) 9482 goto out; 9483 9484 /* Init or reset the session slot tables */ 9485 status = nfs4_setup_session_slot_tables(session); 9486 dprintk("slot table setup returned %d\n", status); 9487 if (status) 9488 goto out; 9489 9490 ptr = (unsigned *)&session->sess_id.data[0]; 9491 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9492 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9493 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9494 out: 9495 return status; 9496 } 9497 9498 /* 9499 * Issue the over-the-wire RPC DESTROY_SESSION. 9500 * The caller must serialize access to this routine. 9501 */ 9502 int nfs4_proc_destroy_session(struct nfs4_session *session, 9503 const struct cred *cred) 9504 { 9505 struct rpc_message msg = { 9506 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9507 .rpc_argp = session, 9508 .rpc_cred = cred, 9509 }; 9510 int status = 0; 9511 9512 /* session is still being setup */ 9513 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9514 return 0; 9515 9516 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9517 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9518 trace_nfs4_destroy_session(session->clp, status); 9519 9520 if (status) 9521 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9522 "Session has been destroyed regardless...\n", status); 9523 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9524 return status; 9525 } 9526 9527 /* 9528 * Renew the cl_session lease. 9529 */ 9530 struct nfs4_sequence_data { 9531 struct nfs_client *clp; 9532 struct nfs4_sequence_args args; 9533 struct nfs4_sequence_res res; 9534 }; 9535 9536 static void nfs41_sequence_release(void *data) 9537 { 9538 struct nfs4_sequence_data *calldata = data; 9539 struct nfs_client *clp = calldata->clp; 9540 9541 if (refcount_read(&clp->cl_count) > 1) 9542 nfs4_schedule_state_renewal(clp); 9543 nfs_put_client(clp); 9544 kfree(calldata); 9545 } 9546 9547 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9548 { 9549 switch(task->tk_status) { 9550 case -NFS4ERR_DELAY: 9551 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9552 return -EAGAIN; 9553 default: 9554 nfs4_schedule_lease_recovery(clp); 9555 } 9556 return 0; 9557 } 9558 9559 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9560 { 9561 struct nfs4_sequence_data *calldata = data; 9562 struct nfs_client *clp = calldata->clp; 9563 9564 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9565 return; 9566 9567 trace_nfs4_sequence(clp, task->tk_status); 9568 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9569 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9570 if (refcount_read(&clp->cl_count) == 1) 9571 return; 9572 9573 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9574 rpc_restart_call_prepare(task); 9575 return; 9576 } 9577 } 9578 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9579 } 9580 9581 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9582 { 9583 struct nfs4_sequence_data *calldata = data; 9584 struct nfs_client *clp = calldata->clp; 9585 struct nfs4_sequence_args *args; 9586 struct nfs4_sequence_res *res; 9587 9588 args = task->tk_msg.rpc_argp; 9589 res = task->tk_msg.rpc_resp; 9590 9591 nfs4_setup_sequence(clp, args, res, task); 9592 } 9593 9594 static const struct rpc_call_ops nfs41_sequence_ops = { 9595 .rpc_call_done = nfs41_sequence_call_done, 9596 .rpc_call_prepare = nfs41_sequence_prepare, 9597 .rpc_release = nfs41_sequence_release, 9598 }; 9599 9600 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9601 const struct cred *cred, 9602 struct nfs4_slot *slot, 9603 bool is_privileged) 9604 { 9605 struct nfs4_sequence_data *calldata; 9606 struct rpc_message msg = { 9607 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9608 .rpc_cred = cred, 9609 }; 9610 struct rpc_task_setup task_setup_data = { 9611 .rpc_client = clp->cl_rpcclient, 9612 .rpc_message = &msg, 9613 .callback_ops = &nfs41_sequence_ops, 9614 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9615 }; 9616 struct rpc_task *ret; 9617 9618 ret = ERR_PTR(-EIO); 9619 if (!refcount_inc_not_zero(&clp->cl_count)) 9620 goto out_err; 9621 9622 ret = ERR_PTR(-ENOMEM); 9623 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9624 if (calldata == NULL) 9625 goto out_put_clp; 9626 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9627 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9628 msg.rpc_argp = &calldata->args; 9629 msg.rpc_resp = &calldata->res; 9630 calldata->clp = clp; 9631 task_setup_data.callback_data = calldata; 9632 9633 ret = rpc_run_task(&task_setup_data); 9634 if (IS_ERR(ret)) 9635 goto out_err; 9636 return ret; 9637 out_put_clp: 9638 nfs_put_client(clp); 9639 out_err: 9640 nfs41_release_slot(slot); 9641 return ret; 9642 } 9643 9644 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9645 { 9646 struct rpc_task *task; 9647 int ret = 0; 9648 9649 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9650 return -EAGAIN; 9651 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9652 if (IS_ERR(task)) 9653 ret = PTR_ERR(task); 9654 else 9655 rpc_put_task_async(task); 9656 dprintk("<-- %s status=%d\n", __func__, ret); 9657 return ret; 9658 } 9659 9660 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9661 { 9662 struct rpc_task *task; 9663 int ret; 9664 9665 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9666 if (IS_ERR(task)) { 9667 ret = PTR_ERR(task); 9668 goto out; 9669 } 9670 ret = rpc_wait_for_completion_task(task); 9671 if (!ret) 9672 ret = task->tk_status; 9673 rpc_put_task(task); 9674 out: 9675 dprintk("<-- %s status=%d\n", __func__, ret); 9676 return ret; 9677 } 9678 9679 struct nfs4_reclaim_complete_data { 9680 struct nfs_client *clp; 9681 struct nfs41_reclaim_complete_args arg; 9682 struct nfs41_reclaim_complete_res res; 9683 }; 9684 9685 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9686 { 9687 struct nfs4_reclaim_complete_data *calldata = data; 9688 9689 nfs4_setup_sequence(calldata->clp, 9690 &calldata->arg.seq_args, 9691 &calldata->res.seq_res, 9692 task); 9693 } 9694 9695 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9696 { 9697 switch(task->tk_status) { 9698 case 0: 9699 wake_up_all(&clp->cl_lock_waitq); 9700 fallthrough; 9701 case -NFS4ERR_COMPLETE_ALREADY: 9702 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9703 break; 9704 case -NFS4ERR_DELAY: 9705 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9706 fallthrough; 9707 case -NFS4ERR_RETRY_UNCACHED_REP: 9708 case -EACCES: 9709 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9710 __func__, task->tk_status, clp->cl_hostname); 9711 return -EAGAIN; 9712 case -NFS4ERR_BADSESSION: 9713 case -NFS4ERR_DEADSESSION: 9714 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9715 break; 9716 default: 9717 nfs4_schedule_lease_recovery(clp); 9718 } 9719 return 0; 9720 } 9721 9722 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9723 { 9724 struct nfs4_reclaim_complete_data *calldata = data; 9725 struct nfs_client *clp = calldata->clp; 9726 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9727 9728 if (!nfs41_sequence_done(task, res)) 9729 return; 9730 9731 trace_nfs4_reclaim_complete(clp, task->tk_status); 9732 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9733 rpc_restart_call_prepare(task); 9734 return; 9735 } 9736 } 9737 9738 static void nfs4_free_reclaim_complete_data(void *data) 9739 { 9740 struct nfs4_reclaim_complete_data *calldata = data; 9741 9742 kfree(calldata); 9743 } 9744 9745 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9746 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9747 .rpc_call_done = nfs4_reclaim_complete_done, 9748 .rpc_release = nfs4_free_reclaim_complete_data, 9749 }; 9750 9751 /* 9752 * Issue a global reclaim complete. 9753 */ 9754 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9755 const struct cred *cred) 9756 { 9757 struct nfs4_reclaim_complete_data *calldata; 9758 struct rpc_message msg = { 9759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9760 .rpc_cred = cred, 9761 }; 9762 struct rpc_task_setup task_setup_data = { 9763 .rpc_client = clp->cl_rpcclient, 9764 .rpc_message = &msg, 9765 .callback_ops = &nfs4_reclaim_complete_call_ops, 9766 .flags = RPC_TASK_NO_ROUND_ROBIN, 9767 }; 9768 int status = -ENOMEM; 9769 9770 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9771 if (calldata == NULL) 9772 goto out; 9773 calldata->clp = clp; 9774 calldata->arg.one_fs = 0; 9775 9776 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9777 msg.rpc_argp = &calldata->arg; 9778 msg.rpc_resp = &calldata->res; 9779 task_setup_data.callback_data = calldata; 9780 status = nfs4_call_sync_custom(&task_setup_data); 9781 out: 9782 dprintk("<-- %s status=%d\n", __func__, status); 9783 return status; 9784 } 9785 9786 static void 9787 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9788 { 9789 struct nfs4_layoutget *lgp = calldata; 9790 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9791 9792 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9793 &lgp->res.seq_res, task); 9794 } 9795 9796 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9797 { 9798 struct nfs4_layoutget *lgp = calldata; 9799 9800 nfs41_sequence_process(task, &lgp->res.seq_res); 9801 } 9802 9803 static int 9804 nfs4_layoutget_handle_exception(struct rpc_task *task, 9805 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9806 { 9807 struct inode *inode = lgp->args.inode; 9808 struct nfs_server *server = NFS_SERVER(inode); 9809 struct pnfs_layout_hdr *lo = lgp->lo; 9810 int nfs4err = task->tk_status; 9811 int err, status = 0; 9812 LIST_HEAD(head); 9813 9814 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9815 9816 nfs4_sequence_free_slot(&lgp->res.seq_res); 9817 9818 exception->state = NULL; 9819 exception->stateid = NULL; 9820 9821 switch (nfs4err) { 9822 case 0: 9823 goto out; 9824 9825 /* 9826 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9827 * on the file. set tk_status to -ENODATA to tell upper layer to 9828 * retry go inband. 9829 */ 9830 case -NFS4ERR_LAYOUTUNAVAILABLE: 9831 status = -ENODATA; 9832 goto out; 9833 /* 9834 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9835 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9836 */ 9837 case -NFS4ERR_BADLAYOUT: 9838 status = -EOVERFLOW; 9839 goto out; 9840 /* 9841 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9842 * (or clients) writing to the same RAID stripe except when 9843 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9844 * 9845 * Treat it like we would RECALLCONFLICT -- we retry for a little 9846 * while, and then eventually give up. 9847 */ 9848 case -NFS4ERR_LAYOUTTRYLATER: 9849 if (lgp->args.minlength == 0) { 9850 status = -EOVERFLOW; 9851 goto out; 9852 } 9853 status = -EBUSY; 9854 break; 9855 case -NFS4ERR_RECALLCONFLICT: 9856 case -NFS4ERR_RETURNCONFLICT: 9857 status = -ERECALLCONFLICT; 9858 break; 9859 case -NFS4ERR_DELEG_REVOKED: 9860 case -NFS4ERR_ADMIN_REVOKED: 9861 case -NFS4ERR_EXPIRED: 9862 case -NFS4ERR_BAD_STATEID: 9863 exception->timeout = 0; 9864 spin_lock(&inode->i_lock); 9865 /* If the open stateid was bad, then recover it. */ 9866 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9867 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9868 spin_unlock(&inode->i_lock); 9869 exception->state = lgp->args.ctx->state; 9870 exception->stateid = &lgp->args.stateid; 9871 break; 9872 } 9873 9874 /* 9875 * Mark the bad layout state as invalid, then retry 9876 */ 9877 pnfs_mark_layout_stateid_invalid(lo, &head); 9878 spin_unlock(&inode->i_lock); 9879 nfs_commit_inode(inode, 0); 9880 pnfs_free_lseg_list(&head); 9881 status = -EAGAIN; 9882 goto out; 9883 } 9884 9885 err = nfs4_handle_exception(server, nfs4err, exception); 9886 if (!status) { 9887 if (exception->retry) 9888 status = -EAGAIN; 9889 else 9890 status = err; 9891 } 9892 out: 9893 return status; 9894 } 9895 9896 size_t max_response_pages(struct nfs_server *server) 9897 { 9898 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9899 return nfs_page_array_len(0, max_resp_sz); 9900 } 9901 9902 static void nfs4_layoutget_release(void *calldata) 9903 { 9904 struct nfs4_layoutget *lgp = calldata; 9905 9906 nfs4_sequence_free_slot(&lgp->res.seq_res); 9907 pnfs_layoutget_free(lgp); 9908 } 9909 9910 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9911 .rpc_call_prepare = nfs4_layoutget_prepare, 9912 .rpc_call_done = nfs4_layoutget_done, 9913 .rpc_release = nfs4_layoutget_release, 9914 }; 9915 9916 struct pnfs_layout_segment * 9917 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, 9918 struct nfs4_exception *exception) 9919 { 9920 struct inode *inode = lgp->args.inode; 9921 struct nfs_server *server = NFS_SERVER(inode); 9922 struct rpc_task *task; 9923 struct rpc_message msg = { 9924 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9925 .rpc_argp = &lgp->args, 9926 .rpc_resp = &lgp->res, 9927 .rpc_cred = lgp->cred, 9928 }; 9929 struct rpc_task_setup task_setup_data = { 9930 .rpc_client = server->client, 9931 .rpc_message = &msg, 9932 .callback_ops = &nfs4_layoutget_call_ops, 9933 .callback_data = lgp, 9934 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9935 RPC_TASK_MOVEABLE, 9936 }; 9937 struct pnfs_layout_segment *lseg = NULL; 9938 int status = 0; 9939 9940 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9941 exception->retry = 0; 9942 9943 task = rpc_run_task(&task_setup_data); 9944 if (IS_ERR(task)) 9945 return ERR_CAST(task); 9946 9947 status = rpc_wait_for_completion_task(task); 9948 if (status != 0) 9949 goto out; 9950 9951 if (task->tk_status < 0) { 9952 exception->retry = 1; 9953 status = nfs4_layoutget_handle_exception(task, lgp, exception); 9954 } else if (lgp->res.layoutp->len == 0) { 9955 exception->retry = 1; 9956 status = -EAGAIN; 9957 nfs4_update_delay(&exception->timeout); 9958 } else 9959 lseg = pnfs_layout_process(lgp); 9960 out: 9961 trace_nfs4_layoutget(lgp->args.ctx, 9962 &lgp->args.range, 9963 &lgp->res.range, 9964 &lgp->res.stateid, 9965 status); 9966 9967 rpc_put_task(task); 9968 dprintk("<-- %s status=%d\n", __func__, status); 9969 if (status) 9970 return ERR_PTR(status); 9971 return lseg; 9972 } 9973 9974 static void 9975 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9976 { 9977 struct nfs4_layoutreturn *lrp = calldata; 9978 9979 nfs4_setup_sequence(lrp->clp, 9980 &lrp->args.seq_args, 9981 &lrp->res.seq_res, 9982 task); 9983 if (!pnfs_layout_is_valid(lrp->args.layout)) 9984 rpc_exit(task, 0); 9985 } 9986 9987 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9988 { 9989 struct nfs4_layoutreturn *lrp = calldata; 9990 struct nfs_server *server; 9991 9992 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9993 return; 9994 9995 if (task->tk_rpc_status == -ETIMEDOUT) { 9996 lrp->rpc_status = -EAGAIN; 9997 lrp->res.lrs_present = 0; 9998 return; 9999 } 10000 /* 10001 * Was there an RPC level error? Assume the call succeeded, 10002 * and that we need to release the layout 10003 */ 10004 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 10005 lrp->res.lrs_present = 0; 10006 return; 10007 } 10008 10009 server = NFS_SERVER(lrp->args.inode); 10010 switch (task->tk_status) { 10011 case -NFS4ERR_OLD_STATEID: 10012 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 10013 &lrp->args.range, 10014 lrp->args.inode)) 10015 goto out_restart; 10016 fallthrough; 10017 default: 10018 task->tk_status = 0; 10019 lrp->res.lrs_present = 0; 10020 fallthrough; 10021 case 0: 10022 break; 10023 case -NFS4ERR_BADSESSION: 10024 case -NFS4ERR_DEADSESSION: 10025 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10026 nfs4_schedule_session_recovery(server->nfs_client->cl_session, 10027 task->tk_status); 10028 lrp->res.lrs_present = 0; 10029 lrp->rpc_status = -EAGAIN; 10030 task->tk_status = 0; 10031 break; 10032 case -NFS4ERR_DELAY: 10033 if (nfs4_async_handle_error(task, server, NULL, NULL) == 10034 -EAGAIN) 10035 goto out_restart; 10036 lrp->res.lrs_present = 0; 10037 break; 10038 } 10039 return; 10040 out_restart: 10041 task->tk_status = 0; 10042 nfs4_sequence_free_slot(&lrp->res.seq_res); 10043 rpc_restart_call_prepare(task); 10044 } 10045 10046 static void nfs4_layoutreturn_release(void *calldata) 10047 { 10048 struct nfs4_layoutreturn *lrp = calldata; 10049 struct pnfs_layout_hdr *lo = lrp->args.layout; 10050 10051 if (lrp->rpc_status == 0 || !lrp->inode) 10052 pnfs_layoutreturn_free_lsegs( 10053 lo, &lrp->args.stateid, &lrp->args.range, 10054 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 10055 else 10056 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid, 10057 &lrp->args.range); 10058 nfs4_sequence_free_slot(&lrp->res.seq_res); 10059 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 10060 lrp->ld_private.ops->free(&lrp->ld_private); 10061 pnfs_put_layout_hdr(lrp->args.layout); 10062 nfs_iput_and_deactive(lrp->inode); 10063 put_cred(lrp->cred); 10064 kfree(calldata); 10065 } 10066 10067 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 10068 .rpc_call_prepare = nfs4_layoutreturn_prepare, 10069 .rpc_call_done = nfs4_layoutreturn_done, 10070 .rpc_release = nfs4_layoutreturn_release, 10071 }; 10072 10073 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags) 10074 { 10075 struct rpc_task *task; 10076 struct rpc_message msg = { 10077 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 10078 .rpc_argp = &lrp->args, 10079 .rpc_resp = &lrp->res, 10080 .rpc_cred = lrp->cred, 10081 }; 10082 struct rpc_task_setup task_setup_data = { 10083 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 10084 .rpc_message = &msg, 10085 .callback_ops = &nfs4_layoutreturn_call_ops, 10086 .callback_data = lrp, 10087 .flags = RPC_TASK_MOVEABLE, 10088 }; 10089 int status = 0; 10090 10091 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 10092 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 10093 &task_setup_data.rpc_client, &msg); 10094 10095 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 10096 if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) { 10097 if (!lrp->inode) { 10098 nfs4_layoutreturn_release(lrp); 10099 return -EAGAIN; 10100 } 10101 task_setup_data.flags |= RPC_TASK_ASYNC; 10102 } 10103 if (!lrp->inode) 10104 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED; 10105 if (flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED) 10106 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 10107 1); 10108 else 10109 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 10110 0); 10111 task = rpc_run_task(&task_setup_data); 10112 if (IS_ERR(task)) 10113 return PTR_ERR(task); 10114 if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC)) 10115 status = task->tk_status; 10116 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 10117 dprintk("<-- %s status=%d\n", __func__, status); 10118 rpc_put_task(task); 10119 return status; 10120 } 10121 10122 static int 10123 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 10124 struct pnfs_device *pdev, 10125 const struct cred *cred) 10126 { 10127 struct nfs4_getdeviceinfo_args args = { 10128 .pdev = pdev, 10129 .notify_types = NOTIFY_DEVICEID4_CHANGE | 10130 NOTIFY_DEVICEID4_DELETE, 10131 }; 10132 struct nfs4_getdeviceinfo_res res = { 10133 .pdev = pdev, 10134 }; 10135 struct rpc_message msg = { 10136 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 10137 .rpc_argp = &args, 10138 .rpc_resp = &res, 10139 .rpc_cred = cred, 10140 }; 10141 int status; 10142 10143 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 10144 if (res.notification & ~args.notify_types) 10145 dprintk("%s: unsupported notification\n", __func__); 10146 if (res.notification != args.notify_types) 10147 pdev->nocache = 1; 10148 10149 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 10150 10151 dprintk("<-- %s status=%d\n", __func__, status); 10152 10153 return status; 10154 } 10155 10156 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 10157 struct pnfs_device *pdev, 10158 const struct cred *cred) 10159 { 10160 struct nfs4_exception exception = { }; 10161 int err; 10162 10163 do { 10164 err = nfs4_handle_exception(server, 10165 _nfs4_proc_getdeviceinfo(server, pdev, cred), 10166 &exception); 10167 } while (exception.retry); 10168 return err; 10169 } 10170 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 10171 10172 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 10173 { 10174 struct nfs4_layoutcommit_data *data = calldata; 10175 struct nfs_server *server = NFS_SERVER(data->args.inode); 10176 10177 nfs4_setup_sequence(server->nfs_client, 10178 &data->args.seq_args, 10179 &data->res.seq_res, 10180 task); 10181 } 10182 10183 static void 10184 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 10185 { 10186 struct nfs4_layoutcommit_data *data = calldata; 10187 struct nfs_server *server = NFS_SERVER(data->args.inode); 10188 10189 if (!nfs41_sequence_done(task, &data->res.seq_res)) 10190 return; 10191 10192 switch (task->tk_status) { /* Just ignore these failures */ 10193 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 10194 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 10195 case -NFS4ERR_BADLAYOUT: /* no layout */ 10196 case -NFS4ERR_GRACE: /* loca_recalim always false */ 10197 task->tk_status = 0; 10198 break; 10199 case 0: 10200 break; 10201 default: 10202 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 10203 rpc_restart_call_prepare(task); 10204 return; 10205 } 10206 } 10207 } 10208 10209 static void nfs4_layoutcommit_release(void *calldata) 10210 { 10211 struct nfs4_layoutcommit_data *data = calldata; 10212 10213 pnfs_cleanup_layoutcommit(data); 10214 nfs_post_op_update_inode_force_wcc(data->args.inode, 10215 data->res.fattr); 10216 put_cred(data->cred); 10217 nfs_iput_and_deactive(data->inode); 10218 kfree(data); 10219 } 10220 10221 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10222 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10223 .rpc_call_done = nfs4_layoutcommit_done, 10224 .rpc_release = nfs4_layoutcommit_release, 10225 }; 10226 10227 int 10228 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10229 { 10230 struct rpc_message msg = { 10231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10232 .rpc_argp = &data->args, 10233 .rpc_resp = &data->res, 10234 .rpc_cred = data->cred, 10235 }; 10236 struct rpc_task_setup task_setup_data = { 10237 .task = &data->task, 10238 .rpc_client = NFS_CLIENT(data->args.inode), 10239 .rpc_message = &msg, 10240 .callback_ops = &nfs4_layoutcommit_ops, 10241 .callback_data = data, 10242 .flags = RPC_TASK_MOVEABLE, 10243 }; 10244 struct rpc_task *task; 10245 int status = 0; 10246 10247 dprintk("NFS: initiating layoutcommit call. sync %d " 10248 "lbw: %llu inode %lu\n", sync, 10249 data->args.lastbytewritten, 10250 data->args.inode->i_ino); 10251 10252 if (!sync) { 10253 data->inode = nfs_igrab_and_active(data->args.inode); 10254 if (data->inode == NULL) { 10255 nfs4_layoutcommit_release(data); 10256 return -EAGAIN; 10257 } 10258 task_setup_data.flags = RPC_TASK_ASYNC; 10259 } 10260 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10261 task = rpc_run_task(&task_setup_data); 10262 if (IS_ERR(task)) 10263 return PTR_ERR(task); 10264 if (sync) 10265 status = task->tk_status; 10266 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10267 dprintk("%s: status %d\n", __func__, status); 10268 rpc_put_task(task); 10269 return status; 10270 } 10271 10272 /* 10273 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10274 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10275 */ 10276 static int 10277 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10278 struct nfs_fsinfo *info, 10279 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10280 { 10281 struct nfs41_secinfo_no_name_args args = { 10282 .style = SECINFO_STYLE_CURRENT_FH, 10283 }; 10284 struct nfs4_secinfo_res res = { 10285 .flavors = flavors, 10286 }; 10287 struct rpc_message msg = { 10288 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10289 .rpc_argp = &args, 10290 .rpc_resp = &res, 10291 }; 10292 struct nfs4_call_sync_data data = { 10293 .seq_server = server, 10294 .seq_args = &args.seq_args, 10295 .seq_res = &res.seq_res, 10296 }; 10297 struct rpc_task_setup task_setup = { 10298 .rpc_client = server->client, 10299 .rpc_message = &msg, 10300 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10301 .callback_data = &data, 10302 .flags = RPC_TASK_NO_ROUND_ROBIN, 10303 }; 10304 const struct cred *cred = NULL; 10305 int status; 10306 10307 if (use_integrity) { 10308 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10309 10310 cred = nfs4_get_clid_cred(server->nfs_client); 10311 msg.rpc_cred = cred; 10312 } 10313 10314 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10315 status = nfs4_call_sync_custom(&task_setup); 10316 dprintk("<-- %s status=%d\n", __func__, status); 10317 10318 put_cred(cred); 10319 10320 return status; 10321 } 10322 10323 static int 10324 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10325 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10326 { 10327 struct nfs4_exception exception = { 10328 .interruptible = true, 10329 }; 10330 int err; 10331 do { 10332 /* first try using integrity protection */ 10333 err = -NFS4ERR_WRONGSEC; 10334 10335 /* try to use integrity protection with machine cred */ 10336 if (_nfs4_is_integrity_protected(server->nfs_client)) 10337 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10338 flavors, true); 10339 10340 /* 10341 * if unable to use integrity protection, or SECINFO with 10342 * integrity protection returns NFS4ERR_WRONGSEC (which is 10343 * disallowed by spec, but exists in deployed servers) use 10344 * the current filesystem's rpc_client and the user cred. 10345 */ 10346 if (err == -NFS4ERR_WRONGSEC) 10347 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10348 flavors, false); 10349 10350 switch (err) { 10351 case 0: 10352 case -NFS4ERR_WRONGSEC: 10353 case -ENOTSUPP: 10354 goto out; 10355 default: 10356 err = nfs4_handle_exception(server, err, &exception); 10357 } 10358 } while (exception.retry); 10359 out: 10360 return err; 10361 } 10362 10363 static int 10364 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10365 struct nfs_fsinfo *info) 10366 { 10367 int err; 10368 struct page *page; 10369 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10370 struct nfs4_secinfo_flavors *flavors; 10371 struct nfs4_secinfo4 *secinfo; 10372 int i; 10373 10374 page = alloc_page(GFP_KERNEL); 10375 if (!page) { 10376 err = -ENOMEM; 10377 goto out; 10378 } 10379 10380 flavors = page_address(page); 10381 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10382 10383 /* 10384 * Fall back on "guess and check" method if 10385 * the server doesn't support SECINFO_NO_NAME 10386 */ 10387 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10388 err = nfs4_find_root_sec(server, fhandle, info); 10389 goto out_freepage; 10390 } 10391 if (err) 10392 goto out_freepage; 10393 10394 for (i = 0; i < flavors->num_flavors; i++) { 10395 secinfo = &flavors->flavors[i]; 10396 10397 switch (secinfo->flavor) { 10398 case RPC_AUTH_NULL: 10399 case RPC_AUTH_UNIX: 10400 case RPC_AUTH_GSS: 10401 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10402 &secinfo->flavor_info); 10403 break; 10404 default: 10405 flavor = RPC_AUTH_MAXFLAVOR; 10406 break; 10407 } 10408 10409 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10410 flavor = RPC_AUTH_MAXFLAVOR; 10411 10412 if (flavor != RPC_AUTH_MAXFLAVOR) { 10413 err = nfs4_lookup_root_sec(server, fhandle, 10414 info, flavor); 10415 if (!err) 10416 break; 10417 } 10418 } 10419 10420 if (flavor == RPC_AUTH_MAXFLAVOR) 10421 err = -EPERM; 10422 10423 out_freepage: 10424 put_page(page); 10425 if (err == -EACCES) 10426 return -EPERM; 10427 out: 10428 return err; 10429 } 10430 10431 static int _nfs41_test_stateid(struct nfs_server *server, 10432 const nfs4_stateid *stateid, 10433 const struct cred *cred) 10434 { 10435 int status; 10436 struct nfs41_test_stateid_args args = { 10437 .stateid = *stateid, 10438 }; 10439 struct nfs41_test_stateid_res res; 10440 struct rpc_message msg = { 10441 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10442 .rpc_argp = &args, 10443 .rpc_resp = &res, 10444 .rpc_cred = cred, 10445 }; 10446 struct rpc_clnt *rpc_client = server->client; 10447 10448 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10449 &rpc_client, &msg); 10450 10451 dprintk("NFS call test_stateid %p\n", stateid); 10452 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10453 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10454 &args.seq_args, &res.seq_res); 10455 if (status != NFS_OK) { 10456 dprintk("NFS reply test_stateid: failed, %d\n", status); 10457 return status; 10458 } 10459 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10460 return -res.status; 10461 } 10462 10463 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10464 int err, struct nfs4_exception *exception) 10465 { 10466 exception->retry = 0; 10467 switch(err) { 10468 case -NFS4ERR_DELAY: 10469 case -NFS4ERR_RETRY_UNCACHED_REP: 10470 nfs4_handle_exception(server, err, exception); 10471 break; 10472 case -NFS4ERR_BADSESSION: 10473 case -NFS4ERR_BADSLOT: 10474 case -NFS4ERR_BAD_HIGH_SLOT: 10475 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10476 case -NFS4ERR_DEADSESSION: 10477 nfs4_do_handle_exception(server, err, exception); 10478 } 10479 } 10480 10481 /** 10482 * nfs41_test_stateid - perform a TEST_STATEID operation 10483 * 10484 * @server: server / transport on which to perform the operation 10485 * @stateid: state ID to test 10486 * @cred: credential 10487 * 10488 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10489 * Otherwise a negative NFS4ERR value is returned if the operation 10490 * failed or the state ID is not currently valid. 10491 */ 10492 static int nfs41_test_stateid(struct nfs_server *server, 10493 const nfs4_stateid *stateid, 10494 const struct cred *cred) 10495 { 10496 struct nfs4_exception exception = { 10497 .interruptible = true, 10498 }; 10499 int err; 10500 do { 10501 err = _nfs41_test_stateid(server, stateid, cred); 10502 nfs4_handle_delay_or_session_error(server, err, &exception); 10503 } while (exception.retry); 10504 return err; 10505 } 10506 10507 struct nfs_free_stateid_data { 10508 struct nfs_server *server; 10509 struct nfs41_free_stateid_args args; 10510 struct nfs41_free_stateid_res res; 10511 }; 10512 10513 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10514 { 10515 struct nfs_free_stateid_data *data = calldata; 10516 nfs4_setup_sequence(data->server->nfs_client, 10517 &data->args.seq_args, 10518 &data->res.seq_res, 10519 task); 10520 } 10521 10522 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10523 { 10524 struct nfs_free_stateid_data *data = calldata; 10525 10526 nfs41_sequence_done(task, &data->res.seq_res); 10527 10528 switch (task->tk_status) { 10529 case -NFS4ERR_DELAY: 10530 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10531 rpc_restart_call_prepare(task); 10532 } 10533 } 10534 10535 static void nfs41_free_stateid_release(void *calldata) 10536 { 10537 struct nfs_free_stateid_data *data = calldata; 10538 struct nfs_client *clp = data->server->nfs_client; 10539 10540 nfs_put_client(clp); 10541 kfree(calldata); 10542 } 10543 10544 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10545 .rpc_call_prepare = nfs41_free_stateid_prepare, 10546 .rpc_call_done = nfs41_free_stateid_done, 10547 .rpc_release = nfs41_free_stateid_release, 10548 }; 10549 10550 /** 10551 * nfs41_free_stateid - perform a FREE_STATEID operation 10552 * 10553 * @server: server / transport on which to perform the operation 10554 * @stateid: state ID to release 10555 * @cred: credential 10556 * @privileged: set to true if this call needs to be privileged 10557 * 10558 * Note: this function is always asynchronous. 10559 */ 10560 static int nfs41_free_stateid(struct nfs_server *server, 10561 const nfs4_stateid *stateid, 10562 const struct cred *cred, 10563 bool privileged) 10564 { 10565 struct rpc_message msg = { 10566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10567 .rpc_cred = cred, 10568 }; 10569 struct rpc_task_setup task_setup = { 10570 .rpc_client = server->client, 10571 .rpc_message = &msg, 10572 .callback_ops = &nfs41_free_stateid_ops, 10573 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10574 }; 10575 struct nfs_free_stateid_data *data; 10576 struct rpc_task *task; 10577 struct nfs_client *clp = server->nfs_client; 10578 10579 if (!refcount_inc_not_zero(&clp->cl_count)) 10580 return -EIO; 10581 10582 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10583 &task_setup.rpc_client, &msg); 10584 10585 dprintk("NFS call free_stateid %p\n", stateid); 10586 data = kmalloc(sizeof(*data), GFP_KERNEL); 10587 if (!data) 10588 return -ENOMEM; 10589 data->server = server; 10590 nfs4_stateid_copy(&data->args.stateid, stateid); 10591 10592 task_setup.callback_data = data; 10593 10594 msg.rpc_argp = &data->args; 10595 msg.rpc_resp = &data->res; 10596 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10597 task = rpc_run_task(&task_setup); 10598 if (IS_ERR(task)) 10599 return PTR_ERR(task); 10600 rpc_put_task(task); 10601 return 0; 10602 } 10603 10604 static void 10605 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10606 { 10607 const struct cred *cred = lsp->ls_state->owner->so_cred; 10608 10609 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10610 nfs4_free_lock_state(server, lsp); 10611 } 10612 10613 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10614 const nfs4_stateid *s2) 10615 { 10616 if (s1->type != s2->type) 10617 return false; 10618 10619 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10620 return false; 10621 10622 if (s1->seqid == s2->seqid) 10623 return true; 10624 10625 return s1->seqid == 0 || s2->seqid == 0; 10626 } 10627 10628 #endif /* CONFIG_NFS_V4_1 */ 10629 10630 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10631 const nfs4_stateid *s2) 10632 { 10633 return nfs4_stateid_match(s1, s2); 10634 } 10635 10636 10637 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10638 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10639 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10640 .recover_open = nfs4_open_reclaim, 10641 .recover_lock = nfs4_lock_reclaim, 10642 .establish_clid = nfs4_init_clientid, 10643 .detect_trunking = nfs40_discover_server_trunking, 10644 }; 10645 10646 #if defined(CONFIG_NFS_V4_1) 10647 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10648 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10649 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10650 .recover_open = nfs4_open_reclaim, 10651 .recover_lock = nfs4_lock_reclaim, 10652 .establish_clid = nfs41_init_clientid, 10653 .reclaim_complete = nfs41_proc_reclaim_complete, 10654 .detect_trunking = nfs41_discover_server_trunking, 10655 }; 10656 #endif /* CONFIG_NFS_V4_1 */ 10657 10658 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10659 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10660 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10661 .recover_open = nfs40_open_expired, 10662 .recover_lock = nfs4_lock_expired, 10663 .establish_clid = nfs4_init_clientid, 10664 }; 10665 10666 #if defined(CONFIG_NFS_V4_1) 10667 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10668 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10669 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10670 .recover_open = nfs41_open_expired, 10671 .recover_lock = nfs41_lock_expired, 10672 .establish_clid = nfs41_init_clientid, 10673 }; 10674 #endif /* CONFIG_NFS_V4_1 */ 10675 10676 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10677 .sched_state_renewal = nfs4_proc_async_renew, 10678 .get_state_renewal_cred = nfs4_get_renew_cred, 10679 .renew_lease = nfs4_proc_renew, 10680 }; 10681 10682 #if defined(CONFIG_NFS_V4_1) 10683 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10684 .sched_state_renewal = nfs41_proc_async_sequence, 10685 .get_state_renewal_cred = nfs4_get_machine_cred, 10686 .renew_lease = nfs4_proc_sequence, 10687 }; 10688 #endif 10689 10690 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10691 .get_locations = _nfs40_proc_get_locations, 10692 .fsid_present = _nfs40_proc_fsid_present, 10693 }; 10694 10695 #if defined(CONFIG_NFS_V4_1) 10696 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10697 .get_locations = _nfs41_proc_get_locations, 10698 .fsid_present = _nfs41_proc_fsid_present, 10699 }; 10700 #endif /* CONFIG_NFS_V4_1 */ 10701 10702 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10703 .minor_version = 0, 10704 .init_caps = NFS_CAP_READDIRPLUS 10705 | NFS_CAP_ATOMIC_OPEN 10706 | NFS_CAP_POSIX_LOCK, 10707 .init_client = nfs40_init_client, 10708 .shutdown_client = nfs40_shutdown_client, 10709 .match_stateid = nfs4_match_stateid, 10710 .find_root_sec = nfs4_find_root_sec, 10711 .free_lock_state = nfs4_release_lockowner, 10712 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10713 .alloc_seqid = nfs_alloc_seqid, 10714 .call_sync_ops = &nfs40_call_sync_ops, 10715 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10716 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10717 .state_renewal_ops = &nfs40_state_renewal_ops, 10718 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10719 }; 10720 10721 #if defined(CONFIG_NFS_V4_1) 10722 static struct nfs_seqid * 10723 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10724 { 10725 return NULL; 10726 } 10727 10728 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10729 .minor_version = 1, 10730 .init_caps = NFS_CAP_READDIRPLUS 10731 | NFS_CAP_ATOMIC_OPEN 10732 | NFS_CAP_POSIX_LOCK 10733 | NFS_CAP_STATEID_NFSV41 10734 | NFS_CAP_ATOMIC_OPEN_V1 10735 | NFS_CAP_LGOPEN 10736 | NFS_CAP_MOVEABLE, 10737 .init_client = nfs41_init_client, 10738 .shutdown_client = nfs41_shutdown_client, 10739 .match_stateid = nfs41_match_stateid, 10740 .find_root_sec = nfs41_find_root_sec, 10741 .free_lock_state = nfs41_free_lock_state, 10742 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10743 .alloc_seqid = nfs_alloc_no_seqid, 10744 .session_trunk = nfs4_test_session_trunk, 10745 .call_sync_ops = &nfs41_call_sync_ops, 10746 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10747 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10748 .state_renewal_ops = &nfs41_state_renewal_ops, 10749 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10750 }; 10751 #endif 10752 10753 #if defined(CONFIG_NFS_V4_2) 10754 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10755 .minor_version = 2, 10756 .init_caps = NFS_CAP_READDIRPLUS 10757 | NFS_CAP_ATOMIC_OPEN 10758 | NFS_CAP_POSIX_LOCK 10759 | NFS_CAP_STATEID_NFSV41 10760 | NFS_CAP_ATOMIC_OPEN_V1 10761 | NFS_CAP_LGOPEN 10762 | NFS_CAP_ALLOCATE 10763 | NFS_CAP_COPY 10764 | NFS_CAP_OFFLOAD_CANCEL 10765 | NFS_CAP_COPY_NOTIFY 10766 | NFS_CAP_DEALLOCATE 10767 | NFS_CAP_SEEK 10768 | NFS_CAP_LAYOUTSTATS 10769 | NFS_CAP_CLONE 10770 | NFS_CAP_LAYOUTERROR 10771 | NFS_CAP_READ_PLUS 10772 | NFS_CAP_MOVEABLE, 10773 .init_client = nfs41_init_client, 10774 .shutdown_client = nfs41_shutdown_client, 10775 .match_stateid = nfs41_match_stateid, 10776 .find_root_sec = nfs41_find_root_sec, 10777 .free_lock_state = nfs41_free_lock_state, 10778 .call_sync_ops = &nfs41_call_sync_ops, 10779 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10780 .alloc_seqid = nfs_alloc_no_seqid, 10781 .session_trunk = nfs4_test_session_trunk, 10782 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10783 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10784 .state_renewal_ops = &nfs41_state_renewal_ops, 10785 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10786 }; 10787 #endif 10788 10789 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10790 [0] = &nfs_v4_0_minor_ops, 10791 #if defined(CONFIG_NFS_V4_1) 10792 [1] = &nfs_v4_1_minor_ops, 10793 #endif 10794 #if defined(CONFIG_NFS_V4_2) 10795 [2] = &nfs_v4_2_minor_ops, 10796 #endif 10797 }; 10798 10799 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10800 { 10801 ssize_t error, error2, error3; 10802 size_t left = size; 10803 10804 error = generic_listxattr(dentry, list, left); 10805 if (error < 0) 10806 return error; 10807 if (list) { 10808 list += error; 10809 left -= error; 10810 } 10811 10812 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left); 10813 if (error2 < 0) 10814 return error2; 10815 10816 if (list) { 10817 list += error2; 10818 left -= error2; 10819 } 10820 10821 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left); 10822 if (error3 < 0) 10823 return error3; 10824 10825 error += error2 + error3; 10826 if (size && error > size) 10827 return -ERANGE; 10828 return error; 10829 } 10830 10831 static void nfs4_enable_swap(struct inode *inode) 10832 { 10833 /* The state manager thread must always be running. 10834 * It will notice the client is a swapper, and stay put. 10835 */ 10836 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10837 10838 nfs4_schedule_state_manager(clp); 10839 } 10840 10841 static void nfs4_disable_swap(struct inode *inode) 10842 { 10843 /* The state manager thread will now exit once it is 10844 * woken. 10845 */ 10846 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10847 10848 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10849 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10850 wake_up_var(&clp->cl_state); 10851 } 10852 10853 static const struct inode_operations nfs4_dir_inode_operations = { 10854 .create = nfs_create, 10855 .lookup = nfs_lookup, 10856 .atomic_open = nfs_atomic_open, 10857 .link = nfs_link, 10858 .unlink = nfs_unlink, 10859 .symlink = nfs_symlink, 10860 .mkdir = nfs_mkdir, 10861 .rmdir = nfs_rmdir, 10862 .mknod = nfs_mknod, 10863 .rename = nfs_rename, 10864 .permission = nfs_permission, 10865 .getattr = nfs_getattr, 10866 .setattr = nfs_setattr, 10867 .listxattr = nfs4_listxattr, 10868 }; 10869 10870 static const struct inode_operations nfs4_file_inode_operations = { 10871 .permission = nfs_permission, 10872 .getattr = nfs_getattr, 10873 .setattr = nfs_setattr, 10874 .listxattr = nfs4_listxattr, 10875 }; 10876 10877 const struct nfs_rpc_ops nfs_v4_clientops = { 10878 .version = 4, /* protocol version */ 10879 .dentry_ops = &nfs4_dentry_operations, 10880 .dir_inode_ops = &nfs4_dir_inode_operations, 10881 .file_inode_ops = &nfs4_file_inode_operations, 10882 .file_ops = &nfs4_file_operations, 10883 .getroot = nfs4_proc_get_root, 10884 .submount = nfs4_submount, 10885 .try_get_tree = nfs4_try_get_tree, 10886 .getattr = nfs4_proc_getattr, 10887 .setattr = nfs4_proc_setattr, 10888 .lookup = nfs4_proc_lookup, 10889 .lookupp = nfs4_proc_lookupp, 10890 .access = nfs4_proc_access, 10891 .readlink = nfs4_proc_readlink, 10892 .create = nfs4_proc_create, 10893 .remove = nfs4_proc_remove, 10894 .unlink_setup = nfs4_proc_unlink_setup, 10895 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10896 .unlink_done = nfs4_proc_unlink_done, 10897 .rename_setup = nfs4_proc_rename_setup, 10898 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10899 .rename_done = nfs4_proc_rename_done, 10900 .link = nfs4_proc_link, 10901 .symlink = nfs4_proc_symlink, 10902 .mkdir = nfs4_proc_mkdir, 10903 .rmdir = nfs4_proc_rmdir, 10904 .readdir = nfs4_proc_readdir, 10905 .mknod = nfs4_proc_mknod, 10906 .statfs = nfs4_proc_statfs, 10907 .fsinfo = nfs4_proc_fsinfo, 10908 .pathconf = nfs4_proc_pathconf, 10909 .set_capabilities = nfs4_server_capabilities, 10910 .decode_dirent = nfs4_decode_dirent, 10911 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10912 .read_setup = nfs4_proc_read_setup, 10913 .read_done = nfs4_read_done, 10914 .write_setup = nfs4_proc_write_setup, 10915 .write_done = nfs4_write_done, 10916 .commit_setup = nfs4_proc_commit_setup, 10917 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10918 .commit_done = nfs4_commit_done, 10919 .lock = nfs4_proc_lock, 10920 .clear_acl_cache = nfs4_zap_acl_attr, 10921 .close_context = nfs4_close_context, 10922 .open_context = nfs4_atomic_open, 10923 .have_delegation = nfs4_have_delegation, 10924 .return_delegation = nfs4_inode_return_delegation, 10925 .alloc_client = nfs4_alloc_client, 10926 .init_client = nfs4_init_client, 10927 .free_client = nfs4_free_client, 10928 .create_server = nfs4_create_server, 10929 .clone_server = nfs_clone_server, 10930 .discover_trunking = nfs4_discover_trunking, 10931 .enable_swap = nfs4_enable_swap, 10932 .disable_swap = nfs4_disable_swap, 10933 }; 10934 10935 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10936 .name = XATTR_NAME_NFSV4_ACL, 10937 .list = nfs4_xattr_list_nfs4_acl, 10938 .get = nfs4_xattr_get_nfs4_acl, 10939 .set = nfs4_xattr_set_nfs4_acl, 10940 }; 10941 10942 #if defined(CONFIG_NFS_V4_1) 10943 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10944 .name = XATTR_NAME_NFSV4_DACL, 10945 .list = nfs4_xattr_list_nfs4_dacl, 10946 .get = nfs4_xattr_get_nfs4_dacl, 10947 .set = nfs4_xattr_set_nfs4_dacl, 10948 }; 10949 10950 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10951 .name = XATTR_NAME_NFSV4_SACL, 10952 .list = nfs4_xattr_list_nfs4_sacl, 10953 .get = nfs4_xattr_get_nfs4_sacl, 10954 .set = nfs4_xattr_set_nfs4_sacl, 10955 }; 10956 #endif 10957 10958 #ifdef CONFIG_NFS_V4_2 10959 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10960 .prefix = XATTR_USER_PREFIX, 10961 .get = nfs4_xattr_get_nfs4_user, 10962 .set = nfs4_xattr_set_nfs4_user, 10963 }; 10964 #endif 10965 10966 const struct xattr_handler * const nfs4_xattr_handlers[] = { 10967 &nfs4_xattr_nfs4_acl_handler, 10968 #if defined(CONFIG_NFS_V4_1) 10969 &nfs4_xattr_nfs4_dacl_handler, 10970 &nfs4_xattr_nfs4_sacl_handler, 10971 #endif 10972 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10973 &nfs4_xattr_nfs4_label_handler, 10974 #endif 10975 #ifdef CONFIG_NFS_V4_2 10976 &nfs4_xattr_nfs4_user_handler, 10977 #endif 10978 NULL 10979 }; 10980