1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Functions to handle the cached directory entries 4 * 5 * Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com> 6 */ 7 8 #include <linux/namei.h> 9 #include "cifsglob.h" 10 #include "cifsproto.h" 11 #include "cifs_debug.h" 12 #include "smb2proto.h" 13 #include "cached_dir.h" 14 15 static struct cached_fid *init_cached_dir(const char *path); 16 static void free_cached_dir(struct cached_fid *cfid); 17 static void smb2_close_cached_fid(struct kref *ref); 18 static void cfids_laundromat_worker(struct work_struct *work); 19 find_or_create_cached_dir(struct cached_fids * cfids,const char * path,bool lookup_only,__u32 max_cached_dirs)20 static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids, 21 const char *path, 22 bool lookup_only, 23 __u32 max_cached_dirs) 24 { 25 struct cached_fid *cfid; 26 27 spin_lock(&cfids->cfid_list_lock); 28 list_for_each_entry(cfid, &cfids->entries, entry) { 29 if (!strcmp(cfid->path, path)) { 30 /* 31 * If it doesn't have a lease it is either not yet 32 * fully cached or it may be in the process of 33 * being deleted due to a lease break. 34 */ 35 if (!cfid->time || !cfid->has_lease) { 36 spin_unlock(&cfids->cfid_list_lock); 37 return NULL; 38 } 39 kref_get(&cfid->refcount); 40 spin_unlock(&cfids->cfid_list_lock); 41 return cfid; 42 } 43 } 44 if (lookup_only) { 45 spin_unlock(&cfids->cfid_list_lock); 46 return NULL; 47 } 48 if (cfids->num_entries >= max_cached_dirs) { 49 spin_unlock(&cfids->cfid_list_lock); 50 return NULL; 51 } 52 cfid = init_cached_dir(path); 53 if (cfid == NULL) { 54 spin_unlock(&cfids->cfid_list_lock); 55 return NULL; 56 } 57 cfid->cfids = cfids; 58 cfids->num_entries++; 59 list_add(&cfid->entry, &cfids->entries); 60 cfid->on_list = true; 61 kref_get(&cfid->refcount); 62 spin_unlock(&cfids->cfid_list_lock); 63 return cfid; 64 } 65 66 static struct dentry * path_to_dentry(struct cifs_sb_info * cifs_sb,const char * path)67 path_to_dentry(struct cifs_sb_info *cifs_sb, const char *path) 68 { 69 struct dentry *dentry; 70 const char *s, *p; 71 char sep; 72 73 sep = CIFS_DIR_SEP(cifs_sb); 74 dentry = dget(cifs_sb->root); 75 s = path; 76 77 do { 78 struct inode *dir = d_inode(dentry); 79 struct dentry *child; 80 81 if (!S_ISDIR(dir->i_mode)) { 82 dput(dentry); 83 dentry = ERR_PTR(-ENOTDIR); 84 break; 85 } 86 87 /* skip separators */ 88 while (*s == sep) 89 s++; 90 if (!*s) 91 break; 92 p = s++; 93 /* next separator */ 94 while (*s && *s != sep) 95 s++; 96 97 child = lookup_positive_unlocked(p, dentry, s - p); 98 dput(dentry); 99 dentry = child; 100 } while (!IS_ERR(dentry)); 101 return dentry; 102 } 103 path_no_prefix(struct cifs_sb_info * cifs_sb,const char * path)104 static const char *path_no_prefix(struct cifs_sb_info *cifs_sb, 105 const char *path) 106 { 107 size_t len = 0; 108 109 if (!*path) 110 return path; 111 112 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && 113 cifs_sb->prepath) { 114 len = strlen(cifs_sb->prepath) + 1; 115 if (unlikely(len > strlen(path))) 116 return ERR_PTR(-EINVAL); 117 } 118 return path + len; 119 } 120 121 /* 122 * Open the and cache a directory handle. 123 * If error then *cfid is not initialized. 124 */ open_cached_dir(unsigned int xid,struct cifs_tcon * tcon,const char * path,struct cifs_sb_info * cifs_sb,bool lookup_only,struct cached_fid ** ret_cfid)125 int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, 126 const char *path, 127 struct cifs_sb_info *cifs_sb, 128 bool lookup_only, struct cached_fid **ret_cfid) 129 { 130 struct cifs_ses *ses; 131 struct TCP_Server_Info *server; 132 struct cifs_open_parms oparms; 133 struct smb2_create_rsp *o_rsp = NULL; 134 struct smb2_query_info_rsp *qi_rsp = NULL; 135 int resp_buftype[2]; 136 struct smb_rqst rqst[2]; 137 struct kvec rsp_iov[2]; 138 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 139 struct kvec qi_iov[1]; 140 int rc, flags = 0; 141 __le16 *utf16_path = NULL; 142 u8 oplock = SMB2_OPLOCK_LEVEL_II; 143 struct cifs_fid *pfid; 144 struct dentry *dentry = NULL; 145 struct cached_fid *cfid; 146 struct cached_fids *cfids; 147 const char *npath; 148 int retries = 0, cur_sleep = 1; 149 150 if (tcon == NULL || tcon->cfids == NULL || tcon->nohandlecache || 151 is_smb1_server(tcon->ses->server) || (dir_cache_timeout == 0)) 152 return -EOPNOTSUPP; 153 154 ses = tcon->ses; 155 cfids = tcon->cfids; 156 157 if (cifs_sb->root == NULL) 158 return -ENOENT; 159 160 replay_again: 161 /* reinitialize for possible replay */ 162 flags = 0; 163 oplock = SMB2_OPLOCK_LEVEL_II; 164 server = cifs_pick_channel(ses); 165 166 if (!server->ops->new_lease_key) 167 return -EIO; 168 169 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); 170 if (!utf16_path) 171 return -ENOMEM; 172 173 cfid = find_or_create_cached_dir(cfids, path, lookup_only, tcon->max_cached_dirs); 174 if (cfid == NULL) { 175 kfree(utf16_path); 176 return -ENOENT; 177 } 178 /* 179 * Return cached fid if it has a lease. Otherwise, it is either a new 180 * entry or laundromat worker removed it from @cfids->entries. Caller 181 * will put last reference if the latter. 182 */ 183 spin_lock(&cfids->cfid_list_lock); 184 if (cfid->has_lease) { 185 spin_unlock(&cfids->cfid_list_lock); 186 *ret_cfid = cfid; 187 kfree(utf16_path); 188 return 0; 189 } 190 spin_unlock(&cfids->cfid_list_lock); 191 192 /* 193 * Skip any prefix paths in @path as lookup_positive_unlocked() ends up 194 * calling ->lookup() which already adds those through 195 * build_path_from_dentry(). Also, do it earlier as we might reconnect 196 * below when trying to send compounded request and then potentially 197 * having a different prefix path (e.g. after DFS failover). 198 */ 199 npath = path_no_prefix(cifs_sb, path); 200 if (IS_ERR(npath)) { 201 rc = PTR_ERR(npath); 202 goto out; 203 } 204 205 if (!npath[0]) { 206 dentry = dget(cifs_sb->root); 207 } else { 208 dentry = path_to_dentry(cifs_sb, npath); 209 if (IS_ERR(dentry)) { 210 rc = -ENOENT; 211 goto out; 212 } 213 } 214 cfid->dentry = dentry; 215 216 /* 217 * We do not hold the lock for the open because in case 218 * SMB2_open needs to reconnect. 219 * This is safe because no other thread will be able to get a ref 220 * to the cfid until we have finished opening the file and (possibly) 221 * acquired a lease. 222 */ 223 if (smb3_encryption_required(tcon)) 224 flags |= CIFS_TRANSFORM_REQ; 225 226 pfid = &cfid->fid; 227 server->ops->new_lease_key(pfid); 228 229 memset(rqst, 0, sizeof(rqst)); 230 resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER; 231 memset(rsp_iov, 0, sizeof(rsp_iov)); 232 233 /* Open */ 234 memset(&open_iov, 0, sizeof(open_iov)); 235 rqst[0].rq_iov = open_iov; 236 rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE; 237 238 oparms = (struct cifs_open_parms) { 239 .tcon = tcon, 240 .path = path, 241 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_FILE), 242 .desired_access = FILE_READ_DATA | FILE_READ_ATTRIBUTES | 243 FILE_READ_EA, 244 .disposition = FILE_OPEN, 245 .fid = pfid, 246 .replay = !!(retries), 247 }; 248 249 rc = SMB2_open_init(tcon, server, 250 &rqst[0], &oplock, &oparms, utf16_path); 251 if (rc) 252 goto oshr_free; 253 smb2_set_next_command(tcon, &rqst[0]); 254 255 memset(&qi_iov, 0, sizeof(qi_iov)); 256 rqst[1].rq_iov = qi_iov; 257 rqst[1].rq_nvec = 1; 258 259 rc = SMB2_query_info_init(tcon, server, 260 &rqst[1], COMPOUND_FID, 261 COMPOUND_FID, FILE_ALL_INFORMATION, 262 SMB2_O_INFO_FILE, 0, 263 sizeof(struct smb2_file_all_info) + 264 PATH_MAX * 2, 0, NULL); 265 if (rc) 266 goto oshr_free; 267 268 smb2_set_related(&rqst[1]); 269 270 /* 271 * Set @cfid->has_lease to true before sending out compounded request so 272 * its lease reference can be put in cached_dir_lease_break() due to a 273 * potential lease break right after the request is sent or while @cfid 274 * is still being cached. Concurrent processes won't be to use it yet 275 * due to @cfid->time being zero. 276 */ 277 cfid->has_lease = true; 278 279 if (retries) { 280 smb2_set_replay(server, &rqst[0]); 281 smb2_set_replay(server, &rqst[1]); 282 } 283 284 rc = compound_send_recv(xid, ses, server, 285 flags, 2, rqst, 286 resp_buftype, rsp_iov); 287 if (rc) { 288 if (rc == -EREMCHG) { 289 tcon->need_reconnect = true; 290 pr_warn_once("server share %s deleted\n", 291 tcon->tree_name); 292 } 293 goto oshr_free; 294 } 295 cfid->tcon = tcon; 296 cfid->is_open = true; 297 298 spin_lock(&cfids->cfid_list_lock); 299 300 o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base; 301 oparms.fid->persistent_fid = o_rsp->PersistentFileId; 302 oparms.fid->volatile_fid = o_rsp->VolatileFileId; 303 #ifdef CONFIG_CIFS_DEBUG2 304 oparms.fid->mid = le64_to_cpu(o_rsp->hdr.MessageId); 305 #endif /* CIFS_DEBUG2 */ 306 307 308 if (o_rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) { 309 spin_unlock(&cfids->cfid_list_lock); 310 rc = -EINVAL; 311 goto oshr_free; 312 } 313 314 rc = smb2_parse_contexts(server, rsp_iov, 315 &oparms.fid->epoch, 316 oparms.fid->lease_key, 317 &oplock, NULL, NULL); 318 if (rc) { 319 spin_unlock(&cfids->cfid_list_lock); 320 goto oshr_free; 321 } 322 323 rc = -EINVAL; 324 if (!(oplock & SMB2_LEASE_READ_CACHING_HE)) { 325 spin_unlock(&cfids->cfid_list_lock); 326 goto oshr_free; 327 } 328 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base; 329 if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info)) { 330 spin_unlock(&cfids->cfid_list_lock); 331 goto oshr_free; 332 } 333 if (!smb2_validate_and_copy_iov( 334 le16_to_cpu(qi_rsp->OutputBufferOffset), 335 sizeof(struct smb2_file_all_info), 336 &rsp_iov[1], sizeof(struct smb2_file_all_info), 337 (char *)&cfid->file_all_info)) 338 cfid->file_all_info_is_valid = true; 339 340 cfid->time = jiffies; 341 spin_unlock(&cfids->cfid_list_lock); 342 /* At this point the directory handle is fully cached */ 343 rc = 0; 344 345 oshr_free: 346 SMB2_open_free(&rqst[0]); 347 SMB2_query_info_free(&rqst[1]); 348 free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base); 349 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base); 350 if (rc) { 351 spin_lock(&cfids->cfid_list_lock); 352 if (cfid->on_list) { 353 list_del(&cfid->entry); 354 cfid->on_list = false; 355 cfids->num_entries--; 356 } 357 if (cfid->has_lease) { 358 /* 359 * We are guaranteed to have two references at this 360 * point. One for the caller and one for a potential 361 * lease. Release the Lease-ref so that the directory 362 * will be closed when the caller closes the cached 363 * handle. 364 */ 365 cfid->has_lease = false; 366 spin_unlock(&cfids->cfid_list_lock); 367 kref_put(&cfid->refcount, smb2_close_cached_fid); 368 goto out; 369 } 370 spin_unlock(&cfids->cfid_list_lock); 371 } 372 out: 373 if (rc) { 374 if (cfid->is_open) 375 SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid, 376 cfid->fid.volatile_fid); 377 free_cached_dir(cfid); 378 } else { 379 *ret_cfid = cfid; 380 atomic_inc(&tcon->num_remote_opens); 381 } 382 kfree(utf16_path); 383 384 if (is_replayable_error(rc) && 385 smb2_should_replay(tcon, &retries, &cur_sleep)) 386 goto replay_again; 387 388 return rc; 389 } 390 open_cached_dir_by_dentry(struct cifs_tcon * tcon,struct dentry * dentry,struct cached_fid ** ret_cfid)391 int open_cached_dir_by_dentry(struct cifs_tcon *tcon, 392 struct dentry *dentry, 393 struct cached_fid **ret_cfid) 394 { 395 struct cached_fid *cfid; 396 struct cached_fids *cfids = tcon->cfids; 397 398 if (cfids == NULL) 399 return -ENOENT; 400 401 spin_lock(&cfids->cfid_list_lock); 402 list_for_each_entry(cfid, &cfids->entries, entry) { 403 if (dentry && cfid->dentry == dentry) { 404 cifs_dbg(FYI, "found a cached root file handle by dentry\n"); 405 kref_get(&cfid->refcount); 406 *ret_cfid = cfid; 407 spin_unlock(&cfids->cfid_list_lock); 408 return 0; 409 } 410 } 411 spin_unlock(&cfids->cfid_list_lock); 412 return -ENOENT; 413 } 414 415 static void smb2_close_cached_fid(struct kref * ref)416 smb2_close_cached_fid(struct kref *ref) 417 { 418 struct cached_fid *cfid = container_of(ref, struct cached_fid, 419 refcount); 420 int rc; 421 422 spin_lock(&cfid->cfids->cfid_list_lock); 423 if (cfid->on_list) { 424 list_del(&cfid->entry); 425 cfid->on_list = false; 426 cfid->cfids->num_entries--; 427 } 428 spin_unlock(&cfid->cfids->cfid_list_lock); 429 430 dput(cfid->dentry); 431 cfid->dentry = NULL; 432 433 if (cfid->is_open) { 434 rc = SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid, 435 cfid->fid.volatile_fid); 436 if (rc) /* should we retry on -EBUSY or -EAGAIN? */ 437 cifs_dbg(VFS, "close cached dir rc %d\n", rc); 438 } 439 440 free_cached_dir(cfid); 441 } 442 drop_cached_dir_by_name(const unsigned int xid,struct cifs_tcon * tcon,const char * name,struct cifs_sb_info * cifs_sb)443 void drop_cached_dir_by_name(const unsigned int xid, struct cifs_tcon *tcon, 444 const char *name, struct cifs_sb_info *cifs_sb) 445 { 446 struct cached_fid *cfid = NULL; 447 int rc; 448 449 rc = open_cached_dir(xid, tcon, name, cifs_sb, true, &cfid); 450 if (rc) { 451 cifs_dbg(FYI, "no cached dir found for rmdir(%s)\n", name); 452 return; 453 } 454 spin_lock(&cfid->cfids->cfid_list_lock); 455 if (cfid->has_lease) { 456 cfid->has_lease = false; 457 kref_put(&cfid->refcount, smb2_close_cached_fid); 458 } 459 spin_unlock(&cfid->cfids->cfid_list_lock); 460 close_cached_dir(cfid); 461 } 462 463 close_cached_dir(struct cached_fid * cfid)464 void close_cached_dir(struct cached_fid *cfid) 465 { 466 kref_put(&cfid->refcount, smb2_close_cached_fid); 467 } 468 469 /* 470 * Called from cifs_kill_sb when we unmount a share 471 */ close_all_cached_dirs(struct cifs_sb_info * cifs_sb)472 void close_all_cached_dirs(struct cifs_sb_info *cifs_sb) 473 { 474 struct rb_root *root = &cifs_sb->tlink_tree; 475 struct rb_node *node; 476 struct cached_fid *cfid; 477 struct cifs_tcon *tcon; 478 struct tcon_link *tlink; 479 struct cached_fids *cfids; 480 481 for (node = rb_first(root); node; node = rb_next(node)) { 482 tlink = rb_entry(node, struct tcon_link, tl_rbnode); 483 tcon = tlink_tcon(tlink); 484 if (IS_ERR(tcon)) 485 continue; 486 cfids = tcon->cfids; 487 if (cfids == NULL) 488 continue; 489 list_for_each_entry(cfid, &cfids->entries, entry) { 490 dput(cfid->dentry); 491 cfid->dentry = NULL; 492 } 493 } 494 } 495 496 /* 497 * Invalidate all cached dirs when a TCON has been reset 498 * due to a session loss. 499 */ invalidate_all_cached_dirs(struct cifs_tcon * tcon)500 void invalidate_all_cached_dirs(struct cifs_tcon *tcon) 501 { 502 struct cached_fids *cfids = tcon->cfids; 503 struct cached_fid *cfid, *q; 504 LIST_HEAD(entry); 505 506 if (cfids == NULL) 507 return; 508 509 spin_lock(&cfids->cfid_list_lock); 510 list_for_each_entry_safe(cfid, q, &cfids->entries, entry) { 511 list_move(&cfid->entry, &entry); 512 cfids->num_entries--; 513 cfid->is_open = false; 514 cfid->on_list = false; 515 /* To prevent race with smb2_cached_lease_break() */ 516 kref_get(&cfid->refcount); 517 } 518 spin_unlock(&cfids->cfid_list_lock); 519 520 list_for_each_entry_safe(cfid, q, &entry, entry) { 521 list_del(&cfid->entry); 522 cancel_work_sync(&cfid->lease_break); 523 if (cfid->has_lease) { 524 /* 525 * We lease was never cancelled from the server so we 526 * need to drop the reference. 527 */ 528 spin_lock(&cfids->cfid_list_lock); 529 cfid->has_lease = false; 530 spin_unlock(&cfids->cfid_list_lock); 531 kref_put(&cfid->refcount, smb2_close_cached_fid); 532 } 533 /* Drop the extra reference opened above*/ 534 kref_put(&cfid->refcount, smb2_close_cached_fid); 535 } 536 } 537 538 static void smb2_cached_lease_break(struct work_struct * work)539 smb2_cached_lease_break(struct work_struct *work) 540 { 541 struct cached_fid *cfid = container_of(work, 542 struct cached_fid, lease_break); 543 544 spin_lock(&cfid->cfids->cfid_list_lock); 545 cfid->has_lease = false; 546 spin_unlock(&cfid->cfids->cfid_list_lock); 547 kref_put(&cfid->refcount, smb2_close_cached_fid); 548 } 549 cached_dir_lease_break(struct cifs_tcon * tcon,__u8 lease_key[16])550 int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]) 551 { 552 struct cached_fids *cfids = tcon->cfids; 553 struct cached_fid *cfid; 554 555 if (cfids == NULL) 556 return false; 557 558 spin_lock(&cfids->cfid_list_lock); 559 list_for_each_entry(cfid, &cfids->entries, entry) { 560 if (cfid->has_lease && 561 !memcmp(lease_key, 562 cfid->fid.lease_key, 563 SMB2_LEASE_KEY_SIZE)) { 564 cfid->time = 0; 565 /* 566 * We found a lease remove it from the list 567 * so no threads can access it. 568 */ 569 list_del(&cfid->entry); 570 cfid->on_list = false; 571 cfids->num_entries--; 572 573 queue_work(cifsiod_wq, 574 &cfid->lease_break); 575 spin_unlock(&cfids->cfid_list_lock); 576 return true; 577 } 578 } 579 spin_unlock(&cfids->cfid_list_lock); 580 return false; 581 } 582 init_cached_dir(const char * path)583 static struct cached_fid *init_cached_dir(const char *path) 584 { 585 struct cached_fid *cfid; 586 587 cfid = kzalloc(sizeof(*cfid), GFP_ATOMIC); 588 if (!cfid) 589 return NULL; 590 cfid->path = kstrdup(path, GFP_ATOMIC); 591 if (!cfid->path) { 592 kfree(cfid); 593 return NULL; 594 } 595 596 INIT_WORK(&cfid->lease_break, smb2_cached_lease_break); 597 INIT_LIST_HEAD(&cfid->entry); 598 INIT_LIST_HEAD(&cfid->dirents.entries); 599 mutex_init(&cfid->dirents.de_mutex); 600 spin_lock_init(&cfid->fid_lock); 601 kref_init(&cfid->refcount); 602 return cfid; 603 } 604 free_cached_dir(struct cached_fid * cfid)605 static void free_cached_dir(struct cached_fid *cfid) 606 { 607 struct cached_dirent *dirent, *q; 608 609 dput(cfid->dentry); 610 cfid->dentry = NULL; 611 612 /* 613 * Delete all cached dirent names 614 */ 615 list_for_each_entry_safe(dirent, q, &cfid->dirents.entries, entry) { 616 list_del(&dirent->entry); 617 kfree(dirent->name); 618 kfree(dirent); 619 } 620 621 kfree(cfid->path); 622 cfid->path = NULL; 623 kfree(cfid); 624 } 625 cfids_laundromat_worker(struct work_struct * work)626 static void cfids_laundromat_worker(struct work_struct *work) 627 { 628 struct cached_fids *cfids; 629 struct cached_fid *cfid, *q; 630 LIST_HEAD(entry); 631 632 cfids = container_of(work, struct cached_fids, laundromat_work.work); 633 634 spin_lock(&cfids->cfid_list_lock); 635 list_for_each_entry_safe(cfid, q, &cfids->entries, entry) { 636 if (cfid->time && 637 time_after(jiffies, cfid->time + HZ * dir_cache_timeout)) { 638 cfid->on_list = false; 639 list_move(&cfid->entry, &entry); 640 cfids->num_entries--; 641 /* To prevent race with smb2_cached_lease_break() */ 642 kref_get(&cfid->refcount); 643 } 644 } 645 spin_unlock(&cfids->cfid_list_lock); 646 647 list_for_each_entry_safe(cfid, q, &entry, entry) { 648 list_del(&cfid->entry); 649 /* 650 * Cancel and wait for the work to finish in case we are racing 651 * with it. 652 */ 653 cancel_work_sync(&cfid->lease_break); 654 if (cfid->has_lease) { 655 /* 656 * Our lease has not yet been cancelled from the server 657 * so we need to drop the reference. 658 */ 659 spin_lock(&cfids->cfid_list_lock); 660 cfid->has_lease = false; 661 spin_unlock(&cfids->cfid_list_lock); 662 kref_put(&cfid->refcount, smb2_close_cached_fid); 663 } 664 /* Drop the extra reference opened above */ 665 kref_put(&cfid->refcount, smb2_close_cached_fid); 666 } 667 queue_delayed_work(cifsiod_wq, &cfids->laundromat_work, 668 dir_cache_timeout * HZ); 669 } 670 init_cached_dirs(void)671 struct cached_fids *init_cached_dirs(void) 672 { 673 struct cached_fids *cfids; 674 675 cfids = kzalloc(sizeof(*cfids), GFP_KERNEL); 676 if (!cfids) 677 return NULL; 678 spin_lock_init(&cfids->cfid_list_lock); 679 INIT_LIST_HEAD(&cfids->entries); 680 681 INIT_DELAYED_WORK(&cfids->laundromat_work, cfids_laundromat_worker); 682 queue_delayed_work(cifsiod_wq, &cfids->laundromat_work, 683 dir_cache_timeout * HZ); 684 685 return cfids; 686 } 687 688 /* 689 * Called from tconInfoFree when we are tearing down the tcon. 690 * There are no active users or open files/directories at this point. 691 */ free_cached_dirs(struct cached_fids * cfids)692 void free_cached_dirs(struct cached_fids *cfids) 693 { 694 struct cached_fid *cfid, *q; 695 LIST_HEAD(entry); 696 697 if (cfids == NULL) 698 return; 699 700 cancel_delayed_work_sync(&cfids->laundromat_work); 701 702 spin_lock(&cfids->cfid_list_lock); 703 list_for_each_entry_safe(cfid, q, &cfids->entries, entry) { 704 cfid->on_list = false; 705 cfid->is_open = false; 706 list_move(&cfid->entry, &entry); 707 } 708 spin_unlock(&cfids->cfid_list_lock); 709 710 list_for_each_entry_safe(cfid, q, &entry, entry) { 711 list_del(&cfid->entry); 712 free_cached_dir(cfid); 713 } 714 715 kfree(cfids); 716 } 717