1 /* $NetBSD: tmpfs_subr.c,v 1.35 2007/07/09 21:10:50 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Efficient memory file system supporting functions. 35 */ 36 37 #include <sys/kernel.h> 38 #include <sys/param.h> 39 #include <sys/priv.h> 40 #include <sys/proc.h> 41 #include <sys/stat.h> 42 #include <sys/systm.h> 43 #include <sys/vnode.h> 44 #include <sys/vmmeter.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_object.h> 48 #include <vm/vm_page.h> 49 #include <vm/vm_pager.h> 50 #include <vm/vm_extern.h> 51 #include <vm/vm_pageout.h> 52 #include <vm/vm_page2.h> 53 54 #include <vfs/tmpfs/tmpfs.h> 55 #include <vfs/tmpfs/tmpfs_vnops.h> 56 57 static ino_t tmpfs_fetch_ino(struct tmpfs_mount *); 58 59 static int tmpfs_dirtree_compare(struct tmpfs_dirent *a, 60 struct tmpfs_dirent *b); 61 RB_GENERATE(tmpfs_dirtree, tmpfs_dirent, rb_node, tmpfs_dirtree_compare); 62 63 static int tmpfs_dirtree_compare_cookie(struct tmpfs_dirent *a, 64 struct tmpfs_dirent *b); 65 RB_GENERATE(tmpfs_dirtree_cookie, tmpfs_dirent, 66 rb_cookienode, tmpfs_dirtree_compare_cookie); 67 68 69 /* --------------------------------------------------------------------- */ 70 71 /* 72 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 73 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 74 * using the credentials of the process 'p'. 75 * 76 * If the node type is set to 'VDIR', then the parent parameter must point 77 * to the parent directory of the node being created. It may only be NULL 78 * while allocating the root node. 79 * 80 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 81 * specifies the device the node represents. 82 * 83 * If the node type is set to 'VLNK', then the parameter target specifies 84 * the file name of the target file for the symbolic link that is being 85 * created. 86 * 87 * Note that new nodes are retrieved from the available list if it has 88 * items or, if it is empty, from the node pool as long as there is enough 89 * space to create them. 90 * 91 * Returns zero on success or an appropriate error code on failure. 92 */ 93 int 94 tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type, 95 uid_t uid, gid_t gid, mode_t mode, 96 char *target, int rmajor, int rminor, 97 struct tmpfs_node **node) 98 { 99 struct tmpfs_node *nnode; 100 struct timespec ts; 101 dev_t rdev; 102 103 KKASSERT(IFF(type == VLNK, target != NULL)); 104 KKASSERT(IFF(type == VBLK || type == VCHR, rmajor != VNOVAL)); 105 106 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max) 107 return (ENOSPC); 108 109 nnode = objcache_get(tmp->tm_node_pool, M_WAITOK | M_NULLOK); 110 if (nnode == NULL) 111 return (ENOSPC); 112 113 /* Generic initialization. */ 114 nnode->tn_type = type; 115 vfs_timestamp(&ts); 116 nnode->tn_ctime = nnode->tn_mtime = nnode->tn_atime 117 = ts.tv_sec; 118 nnode->tn_ctimensec = nnode->tn_mtimensec = nnode->tn_atimensec 119 = ts.tv_nsec; 120 nnode->tn_uid = uid; 121 nnode->tn_gid = gid; 122 nnode->tn_mode = mode; 123 nnode->tn_id = tmpfs_fetch_ino(tmp); 124 nnode->tn_advlock.init_done = 0; 125 KKASSERT(nnode->tn_links == 0); 126 127 /* Type-specific initialization. */ 128 switch (nnode->tn_type) { 129 case VBLK: 130 case VCHR: 131 rdev = makeudev(rmajor, rminor); 132 if (rdev == NOUDEV) { 133 objcache_put(tmp->tm_node_pool, nnode); 134 return(EINVAL); 135 } 136 nnode->tn_rdev = rdev; 137 break; 138 139 case VDIR: 140 RB_INIT(&nnode->tn_dir.tn_dirtree); 141 RB_INIT(&nnode->tn_dir.tn_cookietree); 142 nnode->tn_dir.tn_parent = NULL; 143 nnode->tn_size = 0; 144 break; 145 146 case VFIFO: 147 /* FALLTHROUGH */ 148 case VSOCK: 149 break; 150 151 case VLNK: 152 nnode->tn_size = strlen(target); 153 nnode->tn_link = kmalloc(nnode->tn_size + 1, tmp->tm_name_zone, 154 M_WAITOK | M_NULLOK); 155 if (nnode->tn_link == NULL) { 156 objcache_put(tmp->tm_node_pool, nnode); 157 return (ENOSPC); 158 } 159 bcopy(target, nnode->tn_link, nnode->tn_size); 160 nnode->tn_link[nnode->tn_size] = '\0'; 161 break; 162 163 case VREG: 164 nnode->tn_reg.tn_aobj = swap_pager_alloc(NULL, 0, 165 VM_PROT_DEFAULT, 0); 166 nnode->tn_reg.tn_aobj_pages = 0; 167 nnode->tn_size = 0; 168 vm_object_set_flag(nnode->tn_reg.tn_aobj, OBJ_NOPAGEIN); 169 break; 170 171 default: 172 panic("tmpfs_alloc_node: type %p %d", nnode, (int)nnode->tn_type); 173 } 174 175 TMPFS_NODE_LOCK(nnode); 176 TMPFS_LOCK(tmp); 177 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 178 tmp->tm_nodes_inuse++; 179 TMPFS_UNLOCK(tmp); 180 TMPFS_NODE_UNLOCK(nnode); 181 182 *node = nnode; 183 return 0; 184 } 185 186 /* --------------------------------------------------------------------- */ 187 188 /* 189 * Destroys the node pointed to by node from the file system 'tmp'. 190 * If the node does not belong to the given mount point, the results are 191 * unpredicted. 192 * 193 * If the node references a directory; no entries are allowed because 194 * their removal could need a recursive algorithm, something forbidden in 195 * kernel space. Furthermore, there is not need to provide such 196 * functionality (recursive removal) because the only primitives offered 197 * to the user are the removal of empty directories and the deletion of 198 * individual files. 199 * 200 * Note that nodes are not really deleted; in fact, when a node has been 201 * allocated, it cannot be deleted during the whole life of the file 202 * system. Instead, they are moved to the available list and remain there 203 * until reused. 204 * 205 * A caller must have TMPFS_NODE_LOCK(node) and this function unlocks it. 206 */ 207 void 208 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 209 { 210 vm_pindex_t pages = 0; 211 212 #ifdef INVARIANTS 213 TMPFS_ASSERT_ELOCKED(node); 214 KKASSERT(node->tn_vnode == NULL); 215 #endif 216 217 TMPFS_LOCK(tmp); 218 LIST_REMOVE(node, tn_entries); 219 tmp->tm_nodes_inuse--; 220 TMPFS_UNLOCK(tmp); 221 TMPFS_NODE_UNLOCK(node); /* Caller has this lock */ 222 223 switch (node->tn_type) { 224 case VNON: 225 /* Do not do anything. VNON is provided to let the 226 * allocation routine clean itself easily by avoiding 227 * duplicating code in it. */ 228 /* FALLTHROUGH */ 229 case VBLK: 230 /* FALLTHROUGH */ 231 case VCHR: 232 /* FALLTHROUGH */ 233 break; 234 case VDIR: 235 /* 236 * The parent link can be NULL if this is the root 237 * node or if it is a directory node that was rmdir'd. 238 * 239 * XXX what if node is a directory which still contains 240 * directory entries (e.g. due to a forced umount) ? 241 */ 242 node->tn_size = 0; 243 KKASSERT(node->tn_dir.tn_parent == NULL); 244 245 /* 246 * If the root node is being destroyed don't leave a 247 * dangling pointer in tmpfs_mount. 248 */ 249 if (node == tmp->tm_root) 250 tmp->tm_root = NULL; 251 break; 252 case VFIFO: 253 /* FALLTHROUGH */ 254 case VSOCK: 255 break; 256 257 case VLNK: 258 kfree(node->tn_link, tmp->tm_name_zone); 259 node->tn_link = NULL; 260 node->tn_size = 0; 261 break; 262 263 case VREG: 264 if (node->tn_reg.tn_aobj != NULL) 265 vm_object_deallocate(node->tn_reg.tn_aobj); 266 node->tn_reg.tn_aobj = NULL; 267 pages = node->tn_reg.tn_aobj_pages; 268 break; 269 270 default: 271 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type); 272 } 273 274 /* 275 * Clean up fields for the next allocation. The objcache only ctors 276 * new allocations. 277 */ 278 tmpfs_node_ctor(node, NULL, 0); 279 objcache_put(tmp->tm_node_pool, node); 280 /* node is now invalid */ 281 282 if (pages) 283 atomic_add_long(&tmp->tm_pages_used, -(long)pages); 284 } 285 286 /* --------------------------------------------------------------------- */ 287 288 /* 289 * Allocates a new directory entry for the node node with a name of name. 290 * The new directory entry is returned in *de. 291 * 292 * The link count of node is increased by one to reflect the new object 293 * referencing it. 294 * 295 * Returns zero on success or an appropriate error code on failure. 296 */ 297 int 298 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 299 const char *name, uint16_t len, struct tmpfs_dirent **de) 300 { 301 struct tmpfs_dirent *nde; 302 303 nde = objcache_get(tmp->tm_dirent_pool, M_WAITOK); 304 nde->td_name = kmalloc(len + 1, tmp->tm_name_zone, M_WAITOK | M_NULLOK); 305 if (nde->td_name == NULL) { 306 objcache_put(tmp->tm_dirent_pool, nde); 307 *de = NULL; 308 return (ENOSPC); 309 } 310 nde->td_namelen = len; 311 bcopy(name, nde->td_name, len); 312 nde->td_name[len] = '\0'; 313 314 nde->td_node = node; 315 316 atomic_add_int(&node->tn_links, 1); 317 318 *de = nde; 319 320 return 0; 321 } 322 323 /* --------------------------------------------------------------------- */ 324 325 /* 326 * Frees a directory entry. It is the caller's responsibility to destroy 327 * the node referenced by it if needed. 328 * 329 * The link count of node is decreased by one to reflect the removal of an 330 * object that referenced it. This only happens if 'node_exists' is true; 331 * otherwise the function will not access the node referred to by the 332 * directory entry, as it may already have been released from the outside. 333 */ 334 void 335 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de) 336 { 337 struct tmpfs_node *node; 338 339 node = de->td_node; 340 341 KKASSERT(node->tn_links > 0); 342 atomic_add_int(&node->tn_links, -1); 343 344 kfree(de->td_name, tmp->tm_name_zone); 345 de->td_namelen = 0; 346 de->td_name = NULL; 347 de->td_node = NULL; 348 objcache_put(tmp->tm_dirent_pool, de); 349 } 350 351 /* --------------------------------------------------------------------- */ 352 353 /* 354 * Allocates a new vnode for the node node or returns a new reference to 355 * an existing one if the node had already a vnode referencing it. The 356 * resulting locked vnode is returned in *vpp. 357 * 358 * Returns zero on success or an appropriate error code on failure. 359 * 360 * The caller must ensure that node cannot go away (usually by holding 361 * the related directory entry). 362 * 363 * If dnode is non-NULL this routine avoids deadlocking against it but 364 * can return EAGAIN. Caller must try again. The dnode lock will cycle 365 * in this case, it remains locked on return in all cases. dnode must 366 * be shared-locked. 367 */ 368 int 369 tmpfs_alloc_vp(struct mount *mp, 370 struct tmpfs_node *dnode, struct tmpfs_node *node, int lkflag, 371 struct vnode **vpp) 372 { 373 int error = 0; 374 struct vnode *vp; 375 376 loop: 377 vp = NULL; 378 if (node->tn_vnode == NULL) { 379 error = getnewvnode(VT_TMPFS, mp, &vp, 380 VLKTIMEOUT, LK_CANRECURSE); 381 if (error) 382 goto out; 383 } 384 385 /* 386 * Interlocked extraction from node. This can race many things. 387 * We have to get a soft reference on the vnode while we hold 388 * the node locked, then acquire it properly and check for races. 389 */ 390 TMPFS_NODE_LOCK(node); 391 if (node->tn_vnode) { 392 if (vp) { 393 vp->v_type = VBAD; 394 vx_put(vp); 395 } 396 vp = node->tn_vnode; 397 398 KKASSERT((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0); 399 vhold(vp); 400 TMPFS_NODE_UNLOCK(node); 401 402 if (dnode) { 403 /* 404 * Special-case handling to avoid deadlocking against 405 * dnode. This case has been validated and occurs 406 * every so often during synth builds. 407 */ 408 if (vget(vp, (lkflag & ~LK_RETRY) | 409 LK_NOWAIT | 410 LK_EXCLUSIVE) != 0) { 411 TMPFS_NODE_UNLOCK(dnode); 412 if (vget(vp, (lkflag & ~LK_RETRY) | 413 LK_SLEEPFAIL | 414 LK_EXCLUSIVE) == 0) { 415 vn_unlock(vp); 416 } 417 vdrop(vp); 418 TMPFS_NODE_LOCK_SH(dnode); 419 420 return EAGAIN; 421 } 422 } else { 423 /* 424 * Normal path 425 */ 426 if (vget(vp, lkflag | LK_EXCLUSIVE) != 0) { 427 vdrop(vp); 428 goto loop; 429 } 430 } 431 if (node->tn_vnode != vp) { 432 vput(vp); 433 vdrop(vp); 434 goto loop; 435 } 436 vdrop(vp); 437 goto out; 438 } 439 440 /* 441 * We need to assign node->tn_vnode. If vp is NULL, loop up to 442 * allocate the vp. This can happen due to SMP races. 443 */ 444 if (vp == NULL) { 445 TMPFS_NODE_UNLOCK(node); 446 goto loop; 447 } 448 449 /* 450 * This should never happen. 451 */ 452 if (node->tn_vpstate & TMPFS_VNODE_DOOMED) { 453 TMPFS_NODE_UNLOCK(node); 454 vp->v_type = VBAD; 455 vx_put(vp); 456 error = ENOENT; 457 goto out; 458 } 459 460 KKASSERT(node->tn_vnode == NULL); 461 KKASSERT(vp != NULL); 462 vp->v_data = node; 463 vp->v_type = node->tn_type; 464 465 /* Type-specific initialization. */ 466 switch (node->tn_type) { 467 case VBLK: 468 /* FALLTHROUGH */ 469 case VCHR: 470 /* FALLTHROUGH */ 471 case VSOCK: 472 break; 473 case VREG: 474 /* 475 * VMIO is mandatory. Tmpfs also supports KVABIO 476 * for its tmpfs_strategy(). 477 */ 478 vsetflags(vp, VKVABIO); 479 vinitvmio(vp, node->tn_size, node->tn_blksize, -1); 480 break; 481 case VLNK: 482 break; 483 case VFIFO: 484 vp->v_ops = &mp->mnt_vn_fifo_ops; 485 break; 486 case VDIR: 487 break; 488 489 default: 490 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 491 } 492 493 node->tn_vnode = vp; 494 TMPFS_NODE_UNLOCK(node); 495 496 vx_downgrade(vp); 497 out: 498 *vpp = vp; 499 KKASSERT(IFF(error == 0, *vpp != NULL && vn_islocked(*vpp))); 500 501 return error; 502 } 503 504 /* --------------------------------------------------------------------- */ 505 506 /* 507 * Allocates a new file of type 'type' and adds it to the parent directory 508 * 'dvp'; this addition is done using the component name given in 'cnp'. 509 * The ownership of the new file is automatically assigned based on the 510 * credentials of the caller (through 'cnp'), the group is set based on 511 * the parent directory and the mode is determined from the 'vap' argument. 512 * If successful, *vpp holds a vnode to the newly created file and zero 513 * is returned. Otherwise *vpp is NULL and the function returns an 514 * appropriate error code. 515 */ 516 int 517 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 518 struct namecache *ncp, struct ucred *cred, char *target) 519 { 520 int error; 521 struct tmpfs_dirent *de; 522 struct tmpfs_mount *tmp; 523 struct tmpfs_node *dnode; 524 struct tmpfs_node *node; 525 526 tmp = VFS_TO_TMPFS(dvp->v_mount); 527 dnode = VP_TO_TMPFS_DIR(dvp); 528 *vpp = NULL; 529 530 /* 531 * If the directory was removed but a process was CD'd into it, 532 * we do not allow any more file/dir creation within it. Otherwise 533 * we will lose track of it. 534 */ 535 KKASSERT(dnode->tn_type == VDIR); 536 if (dnode != tmp->tm_root && dnode->tn_dir.tn_parent == NULL) 537 return ENOENT; 538 539 /* 540 * Make sure the link count does not overflow. 541 */ 542 if (vap->va_type == VDIR && dnode->tn_links >= LINK_MAX) 543 return EMLINK; 544 545 /* Allocate a node that represents the new file. */ 546 error = tmpfs_alloc_node(tmp, vap->va_type, cred->cr_uid, 547 dnode->tn_gid, vap->va_mode, target, 548 vap->va_rmajor, vap->va_rminor, &node); 549 if (error != 0) 550 return error; 551 TMPFS_NODE_LOCK(node); 552 553 /* Allocate a directory entry that points to the new file. */ 554 error = tmpfs_alloc_dirent(tmp, node, ncp->nc_name, ncp->nc_nlen, &de); 555 if (error != 0) { 556 tmpfs_free_node(tmp, node); 557 /* eats node lock */ 558 return error; 559 } 560 561 /* Allocate a vnode for the new file. */ 562 error = tmpfs_alloc_vp(dvp->v_mount, NULL, node, LK_EXCLUSIVE, vpp); 563 if (error != 0) { 564 tmpfs_free_dirent(tmp, de); 565 tmpfs_free_node(tmp, node); 566 /* eats node lock */ 567 return error; 568 } 569 570 /* 571 * Now that all required items are allocated, we can proceed to 572 * insert the new node into the directory, an operation that 573 * cannot fail. 574 */ 575 tmpfs_dir_attach(dnode, de); 576 TMPFS_NODE_UNLOCK(node); 577 578 return error; 579 } 580 581 /* --------------------------------------------------------------------- */ 582 583 /* 584 * Attaches the directory entry de to the directory represented by dnode. 585 * Note that this does not change the link count of the node pointed by 586 * the directory entry, as this is done by tmpfs_alloc_dirent. 587 */ 588 void 589 tmpfs_dir_attach(struct tmpfs_node *dnode, struct tmpfs_dirent *de) 590 { 591 struct tmpfs_node *node = de->td_node; 592 593 TMPFS_NODE_LOCK(dnode); 594 if (node && node->tn_type == VDIR) { 595 TMPFS_NODE_LOCK(node); 596 atomic_add_int(&node->tn_links, 1); 597 node->tn_status |= TMPFS_NODE_CHANGED; 598 node->tn_dir.tn_parent = dnode; 599 atomic_add_int(&dnode->tn_links, 1); 600 TMPFS_NODE_UNLOCK(node); 601 } 602 RB_INSERT(tmpfs_dirtree, &dnode->tn_dir.tn_dirtree, de); 603 RB_INSERT(tmpfs_dirtree_cookie, &dnode->tn_dir.tn_cookietree, de); 604 dnode->tn_size += sizeof(struct tmpfs_dirent); 605 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 606 TMPFS_NODE_MODIFIED; 607 TMPFS_NODE_UNLOCK(dnode); 608 } 609 610 /* --------------------------------------------------------------------- */ 611 612 /* 613 * Detaches the directory entry de from the directory represented by dnode. 614 * Note that this does not change the link count of the node pointed by 615 * the directory entry, as this is done by tmpfs_free_dirent. 616 */ 617 void 618 tmpfs_dir_detach(struct tmpfs_node *dnode, struct tmpfs_dirent *de) 619 { 620 struct tmpfs_node *node = de->td_node; 621 622 TMPFS_NODE_LOCK(dnode); 623 RB_REMOVE(tmpfs_dirtree, &dnode->tn_dir.tn_dirtree, de); 624 RB_REMOVE(tmpfs_dirtree_cookie, &dnode->tn_dir.tn_cookietree, de); 625 dnode->tn_size -= sizeof(struct tmpfs_dirent); 626 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 627 TMPFS_NODE_MODIFIED; 628 TMPFS_NODE_UNLOCK(dnode); 629 630 /* 631 * Clean out the tn_parent pointer immediately when removing a 632 * directory. 633 * 634 * Removal of the parent linkage also cleans out the extra tn_links 635 * count we had on both node and dnode. 636 * 637 * node can be NULL (typ during a forced umount), in which case 638 * the mount code is dealing with the linkages from a linked list 639 * scan. 640 */ 641 if (node && node->tn_type == VDIR && node->tn_dir.tn_parent) { 642 TMPFS_NODE_LOCK(dnode); 643 TMPFS_NODE_LOCK(node); 644 KKASSERT(node->tn_dir.tn_parent == dnode); 645 atomic_add_int(&dnode->tn_links, -1); 646 atomic_add_int(&node->tn_links, -1); 647 node->tn_dir.tn_parent = NULL; 648 TMPFS_NODE_UNLOCK(node); 649 TMPFS_NODE_UNLOCK(dnode); 650 } 651 } 652 653 /* --------------------------------------------------------------------- */ 654 655 /* 656 * Looks for a directory entry in the directory represented by node. 657 * 'ncp' describes the name of the entry to look for. Note that the . 658 * and .. components are not allowed as they do not physically exist 659 * within directories. 660 * 661 * Returns a pointer to the entry when found, otherwise NULL. 662 * 663 * Caller must hold the node locked (shared ok) 664 */ 665 struct tmpfs_dirent * 666 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 667 struct namecache *ncp) 668 { 669 struct tmpfs_dirent *de; 670 int len = ncp->nc_nlen; 671 struct tmpfs_dirent wanted; 672 673 wanted.td_namelen = len; 674 wanted.td_name = ncp->nc_name; 675 676 TMPFS_VALIDATE_DIR(node); 677 678 de = RB_FIND(tmpfs_dirtree, &node->tn_dir.tn_dirtree, &wanted); 679 680 KKASSERT(f == NULL || de == NULL || f == de->td_node); 681 682 return de; 683 } 684 685 /* --------------------------------------------------------------------- */ 686 687 /* 688 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 689 * directory and returns it in the uio space. The function returns 0 690 * on success, -1 if there was not enough space in the uio structure to 691 * hold the directory entry or an appropriate error code if another 692 * error happens. 693 */ 694 int 695 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 696 { 697 int error; 698 699 TMPFS_VALIDATE_DIR(node); 700 KKASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 701 702 if (vop_write_dirent(&error, uio, node->tn_id, DT_DIR, 1, ".")) 703 return -1; 704 if (error == 0) 705 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 706 return error; 707 } 708 709 /* --------------------------------------------------------------------- */ 710 711 /* 712 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 713 * directory and returns it in the uio space. The function returns 0 714 * on success, -1 if there was not enough space in the uio structure to 715 * hold the directory entry or an appropriate error code if another 716 * error happens. 717 */ 718 int 719 tmpfs_dir_getdotdotdent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 720 struct uio *uio) 721 { 722 int error; 723 ino_t d_ino; 724 725 TMPFS_VALIDATE_DIR(node); 726 KKASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 727 728 if (node->tn_dir.tn_parent) { 729 TMPFS_NODE_LOCK(node); 730 if (node->tn_dir.tn_parent) 731 d_ino = node->tn_dir.tn_parent->tn_id; 732 else 733 d_ino = tmp->tm_root->tn_id; 734 TMPFS_NODE_UNLOCK(node); 735 } else { 736 d_ino = tmp->tm_root->tn_id; 737 } 738 739 if (vop_write_dirent(&error, uio, d_ino, DT_DIR, 2, "..")) 740 return -1; 741 if (error == 0) { 742 struct tmpfs_dirent *de; 743 de = RB_MIN(tmpfs_dirtree_cookie, &node->tn_dir.tn_cookietree); 744 if (de == NULL) 745 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 746 else 747 uio->uio_offset = tmpfs_dircookie(de); 748 } 749 return error; 750 } 751 752 /* --------------------------------------------------------------------- */ 753 754 /* 755 * Lookup a directory entry by its associated cookie. 756 * 757 * Must be called with the directory node locked (shared ok) 758 */ 759 struct lubycookie_info { 760 off_t cookie; 761 struct tmpfs_dirent *de; 762 }; 763 764 static int 765 lubycookie_cmp(struct tmpfs_dirent *de, void *arg) 766 { 767 struct lubycookie_info *info = arg; 768 off_t cookie = tmpfs_dircookie(de); 769 770 if (cookie < info->cookie) 771 return(-1); 772 if (cookie > info->cookie) 773 return(1); 774 return(0); 775 } 776 777 static int 778 lubycookie_callback(struct tmpfs_dirent *de, void *arg) 779 { 780 struct lubycookie_info *info = arg; 781 782 if (tmpfs_dircookie(de) == info->cookie) { 783 info->de = de; 784 return(-1); 785 } 786 return(0); 787 } 788 789 struct tmpfs_dirent * 790 tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie) 791 { 792 struct lubycookie_info info; 793 794 info.cookie = cookie; 795 info.de = NULL; 796 RB_SCAN(tmpfs_dirtree_cookie, &node->tn_dir.tn_cookietree, 797 lubycookie_cmp, lubycookie_callback, &info); 798 return (info.de); 799 } 800 801 /* --------------------------------------------------------------------- */ 802 803 /* 804 * Helper function for tmpfs_readdir. Returns as much directory entries 805 * as can fit in the uio space. The read starts at uio->uio_offset. 806 * The function returns 0 on success, -1 if there was not enough space 807 * in the uio structure to hold the directory entry or an appropriate 808 * error code if another error happens. 809 * 810 * Caller must hold the node locked (shared ok) 811 */ 812 int 813 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp) 814 { 815 int error; 816 off_t startcookie; 817 struct tmpfs_dirent *de; 818 819 TMPFS_VALIDATE_DIR(node); 820 821 /* 822 * Locate the first directory entry we have to return. We have cached 823 * the last readdir in the node, so use those values if appropriate. 824 * Otherwise do a linear scan to find the requested entry. 825 */ 826 startcookie = uio->uio_offset; 827 KKASSERT(startcookie != TMPFS_DIRCOOKIE_DOT); 828 KKASSERT(startcookie != TMPFS_DIRCOOKIE_DOTDOT); 829 830 if (startcookie == TMPFS_DIRCOOKIE_EOF) 831 return 0; 832 833 de = tmpfs_dir_lookupbycookie(node, startcookie); 834 if (de == NULL) 835 return EINVAL; 836 837 /* 838 * Read as much entries as possible; i.e., until we reach the end of 839 * the directory or we exhaust uio space. 840 */ 841 do { 842 ino_t d_ino; 843 uint8_t d_type; 844 845 /* Create a dirent structure representing the current 846 * tmpfs_node and fill it. */ 847 d_ino = de->td_node->tn_id; 848 switch (de->td_node->tn_type) { 849 case VBLK: 850 d_type = DT_BLK; 851 break; 852 853 case VCHR: 854 d_type = DT_CHR; 855 break; 856 857 case VDIR: 858 d_type = DT_DIR; 859 break; 860 861 case VFIFO: 862 d_type = DT_FIFO; 863 break; 864 865 case VLNK: 866 d_type = DT_LNK; 867 break; 868 869 case VREG: 870 d_type = DT_REG; 871 break; 872 873 case VSOCK: 874 d_type = DT_SOCK; 875 break; 876 877 default: 878 panic("tmpfs_dir_getdents: type %p %d", 879 de->td_node, (int)de->td_node->tn_type); 880 } 881 KKASSERT(de->td_namelen < 256); /* 255 + 1 */ 882 883 if (vop_write_dirent(&error, uio, d_ino, d_type, 884 de->td_namelen, de->td_name)) { 885 error = -1; 886 break; 887 } 888 889 (*cntp)++; 890 de = RB_NEXT(tmpfs_dirtree_cookie, 891 node->tn_dir.tn_cookietree, de); 892 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 893 894 /* Update the offset and cache. */ 895 if (de == NULL) { 896 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 897 } else { 898 uio->uio_offset = tmpfs_dircookie(de); 899 } 900 901 return error; 902 } 903 904 /* --------------------------------------------------------------------- */ 905 906 /* 907 * Resizes the aobj associated to the regular file pointed to by vp to 908 * the size newsize. 'vp' must point to a vnode that represents a regular 909 * file. 'newsize' must be positive. 910 * 911 * pass NVEXTF_TRIVIAL when buf content will be overwritten, otherwise set 0 912 * to be zero filled. 913 * 914 * Returns zero on success or an appropriate error code on failure. 915 * 916 * Caller must hold the node exclusively locked. 917 */ 918 int 919 tmpfs_reg_resize(struct vnode *vp, off_t newsize, int trivial) 920 { 921 int error; 922 vm_pindex_t newpages, oldpages; 923 struct tmpfs_mount *tmp; 924 struct tmpfs_node *node; 925 off_t oldsize; 926 int nvextflags; 927 928 #ifdef INVARIANTS 929 KKASSERT(vp->v_type == VREG); 930 KKASSERT(newsize >= 0); 931 #endif 932 933 node = VP_TO_TMPFS_NODE(vp); 934 tmp = VFS_TO_TMPFS(vp->v_mount); 935 936 /* 937 * Convert the old and new sizes to the number of pages needed to 938 * store them. It may happen that we do not need to do anything 939 * because the last allocated page can accommodate the change on 940 * its own. 941 */ 942 oldsize = node->tn_size; 943 oldpages = round_page64(oldsize) / PAGE_SIZE; 944 KKASSERT(oldpages == node->tn_reg.tn_aobj_pages); 945 newpages = round_page64(newsize) / PAGE_SIZE; 946 947 if (newpages > oldpages && 948 tmp->tm_pages_used + newpages - oldpages > tmp->tm_pages_max) { 949 error = ENOSPC; 950 goto out; 951 } 952 node->tn_reg.tn_aobj_pages = newpages; 953 node->tn_size = newsize; 954 955 if (newpages != oldpages) 956 atomic_add_long(&tmp->tm_pages_used, (newpages - oldpages)); 957 958 /* 959 * nvextflags to pass along for bdwrite() vs buwrite() 960 */ 961 if (vm_pages_needed || vm_paging_needed(0) || 962 tmpfs_bufcache_mode >= 2) { 963 nvextflags = 0; 964 } else { 965 nvextflags = NVEXTF_BUWRITE; 966 } 967 968 969 /* 970 * When adjusting the vnode filesize and its VM object we must 971 * also adjust our backing VM object (aobj). The blocksize 972 * used must match the block sized we use for the buffer cache. 973 * 974 * The backing VM object may contain VM pages as well as swap 975 * assignments if we previously renamed main object pages into 976 * it during deactivation. 977 * 978 * To make things easier tmpfs uses a blksize in multiples of 979 * PAGE_SIZE, and will only increase the blksize as a small file 980 * increases in size. Once a file has exceeded TMPFS_BLKSIZE (16KB), 981 * the blksize is maxed out. Truncating the file does not reduce 982 * the blksize. 983 */ 984 if (newsize < oldsize) { 985 vm_pindex_t osize; 986 vm_pindex_t nsize; 987 vm_object_t aobj; 988 989 error = nvtruncbuf(vp, newsize, node->tn_blksize, 990 -1, nvextflags); 991 aobj = node->tn_reg.tn_aobj; 992 if (aobj) { 993 osize = aobj->size; 994 nsize = vp->v_object->size; 995 if (nsize < osize) { 996 aobj->size = osize; 997 swap_pager_freespace(aobj, nsize, 998 osize - nsize); 999 vm_object_page_remove(aobj, nsize, osize, 1000 FALSE); 1001 } 1002 } 1003 } else { 1004 vm_object_t aobj; 1005 int nblksize; 1006 1007 /* 1008 * The first (and only the first) buffer in the file is resized 1009 * in multiples of PAGE_SIZE, up to TMPFS_BLKSIZE. 1010 */ 1011 nblksize = node->tn_blksize; 1012 while (nblksize < TMPFS_BLKSIZE && 1013 nblksize < newsize) { 1014 nblksize += PAGE_SIZE; 1015 } 1016 1017 if (trivial) 1018 nvextflags |= NVEXTF_TRIVIAL; 1019 1020 error = nvextendbuf(vp, oldsize, newsize, 1021 node->tn_blksize, nblksize, 1022 -1, -1, nvextflags); 1023 node->tn_blksize = nblksize; 1024 aobj = node->tn_reg.tn_aobj; 1025 if (aobj) 1026 aobj->size = vp->v_object->size; 1027 } 1028 1029 out: 1030 return error; 1031 } 1032 1033 /* --------------------------------------------------------------------- */ 1034 1035 /* 1036 * Change flags of the given vnode. 1037 * Caller should execute tmpfs_update on vp after a successful execution. 1038 * The vnode must be locked on entry and remain locked on exit. 1039 */ 1040 int 1041 tmpfs_chflags(struct vnode *vp, u_long vaflags, struct ucred *cred) 1042 { 1043 int error; 1044 struct tmpfs_node *node; 1045 int flags; 1046 1047 KKASSERT(vn_islocked(vp)); 1048 1049 node = VP_TO_TMPFS_NODE(vp); 1050 flags = node->tn_flags; 1051 1052 /* Disallow this operation if the file system is mounted read-only. */ 1053 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1054 return EROFS; 1055 error = vop_helper_setattr_flags(&flags, vaflags, node->tn_uid, cred); 1056 1057 /* Actually change the flags on the node itself */ 1058 if (error == 0) { 1059 TMPFS_NODE_LOCK(node); 1060 node->tn_flags = flags; 1061 node->tn_status |= TMPFS_NODE_CHANGED; 1062 TMPFS_NODE_UNLOCK(node); 1063 } 1064 1065 KKASSERT(vn_islocked(vp)); 1066 1067 return error; 1068 } 1069 1070 /* --------------------------------------------------------------------- */ 1071 1072 /* 1073 * Change access mode on the given vnode. 1074 * Caller should execute tmpfs_update on vp after a successful execution. 1075 * The vnode must be locked on entry and remain locked on exit. 1076 */ 1077 int 1078 tmpfs_chmod(struct vnode *vp, mode_t vamode, struct ucred *cred) 1079 { 1080 struct tmpfs_node *node; 1081 mode_t cur_mode; 1082 int error; 1083 1084 KKASSERT(vn_islocked(vp)); 1085 1086 node = VP_TO_TMPFS_NODE(vp); 1087 1088 /* Disallow this operation if the file system is mounted read-only. */ 1089 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1090 return EROFS; 1091 1092 /* Immutable or append-only files cannot be modified, either. */ 1093 if (node->tn_flags & (IMMUTABLE | APPEND)) 1094 return EPERM; 1095 1096 cur_mode = node->tn_mode; 1097 error = vop_helper_chmod(vp, vamode, cred, node->tn_uid, node->tn_gid, 1098 &cur_mode); 1099 1100 if (error == 0 && 1101 (node->tn_mode & ALLPERMS) != (cur_mode & ALLPERMS)) { 1102 TMPFS_NODE_LOCK(node); 1103 node->tn_mode &= ~ALLPERMS; 1104 node->tn_mode |= cur_mode & ALLPERMS; 1105 1106 node->tn_status |= TMPFS_NODE_CHANGED; 1107 TMPFS_NODE_UNLOCK(node); 1108 } 1109 1110 KKASSERT(vn_islocked(vp)); 1111 1112 return 0; 1113 } 1114 1115 /* --------------------------------------------------------------------- */ 1116 1117 /* 1118 * Change ownership of the given vnode. At least one of uid or gid must 1119 * be different than VNOVAL. If one is set to that value, the attribute 1120 * is unchanged. 1121 * Caller should execute tmpfs_update on vp after a successful execution. 1122 * The vnode must be locked on entry and remain locked on exit. 1123 */ 1124 int 1125 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred) 1126 { 1127 mode_t cur_mode; 1128 uid_t cur_uid; 1129 gid_t cur_gid; 1130 struct tmpfs_node *node; 1131 int error; 1132 1133 KKASSERT(vn_islocked(vp)); 1134 node = VP_TO_TMPFS_NODE(vp); 1135 1136 /* Disallow this operation if the file system is mounted read-only. */ 1137 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1138 return EROFS; 1139 1140 /* Immutable or append-only files cannot be modified, either. */ 1141 if (node->tn_flags & (IMMUTABLE | APPEND)) 1142 return EPERM; 1143 1144 cur_uid = node->tn_uid; 1145 cur_gid = node->tn_gid; 1146 cur_mode = node->tn_mode; 1147 error = vop_helper_chown(vp, uid, gid, cred, 1148 &cur_uid, &cur_gid, &cur_mode); 1149 1150 if (error == 0) { 1151 TMPFS_NODE_LOCK(node); 1152 if (cur_uid != node->tn_uid || 1153 cur_gid != node->tn_gid || 1154 cur_mode != node->tn_mode) { 1155 node->tn_uid = cur_uid; 1156 node->tn_gid = cur_gid; 1157 node->tn_mode = cur_mode; 1158 node->tn_status |= TMPFS_NODE_CHANGED; 1159 } 1160 TMPFS_NODE_UNLOCK(node); 1161 } 1162 1163 return error; 1164 } 1165 1166 /* --------------------------------------------------------------------- */ 1167 1168 /* 1169 * Change size of the given vnode. 1170 * Caller should execute tmpfs_update on vp after a successful execution. 1171 * The vnode must be locked on entry and remain locked on exit. 1172 */ 1173 int 1174 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred) 1175 { 1176 int error; 1177 struct tmpfs_node *node; 1178 1179 KKASSERT(vn_islocked(vp)); 1180 1181 node = VP_TO_TMPFS_NODE(vp); 1182 1183 /* Decide whether this is a valid operation based on the file type. */ 1184 error = 0; 1185 switch (vp->v_type) { 1186 case VDIR: 1187 return EISDIR; 1188 1189 case VREG: 1190 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1191 return EROFS; 1192 break; 1193 1194 case VBLK: 1195 /* FALLTHROUGH */ 1196 case VCHR: 1197 /* FALLTHROUGH */ 1198 case VFIFO: 1199 /* Allow modifications of special files even if in the file 1200 * system is mounted read-only (we are not modifying the 1201 * files themselves, but the objects they represent). */ 1202 return 0; 1203 1204 default: 1205 /* Anything else is unsupported. */ 1206 return EOPNOTSUPP; 1207 } 1208 1209 /* Immutable or append-only files cannot be modified, either. */ 1210 if (node->tn_flags & (IMMUTABLE | APPEND)) 1211 return EPERM; 1212 1213 error = tmpfs_truncate(vp, size); 1214 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1215 * for us, as will update tn_status; no need to do that here. */ 1216 1217 KKASSERT(vn_islocked(vp)); 1218 1219 return error; 1220 } 1221 1222 /* --------------------------------------------------------------------- */ 1223 1224 /* 1225 * Change access and modification times of the given vnode. 1226 * Caller should execute tmpfs_update on vp after a successful execution. 1227 * The vnode must be locked on entry and remain locked on exit. 1228 */ 1229 int 1230 tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime, 1231 int vaflags, struct ucred *cred) 1232 { 1233 struct tmpfs_node *node; 1234 1235 KKASSERT(vn_islocked(vp)); 1236 1237 node = VP_TO_TMPFS_NODE(vp); 1238 1239 /* Disallow this operation if the file system is mounted read-only. */ 1240 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1241 return EROFS; 1242 1243 /* Immutable or append-only files cannot be modified, either. */ 1244 if (node->tn_flags & (IMMUTABLE | APPEND)) 1245 return EPERM; 1246 1247 TMPFS_NODE_LOCK(node); 1248 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL) 1249 node->tn_status |= TMPFS_NODE_ACCESSED; 1250 1251 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL) { 1252 node->tn_status |= TMPFS_NODE_MODIFIED; 1253 vclrflags(vp, VLASTWRITETS); 1254 } 1255 1256 TMPFS_NODE_UNLOCK(node); 1257 1258 tmpfs_itimes(vp, atime, mtime); 1259 1260 KKASSERT(vn_islocked(vp)); 1261 1262 return 0; 1263 } 1264 1265 /* --------------------------------------------------------------------- */ 1266 /* Sync timestamps */ 1267 void 1268 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1269 const struct timespec *mod) 1270 { 1271 struct tmpfs_node *node; 1272 struct timespec now; 1273 1274 node = VP_TO_TMPFS_NODE(vp); 1275 1276 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1277 TMPFS_NODE_CHANGED)) == 0) { 1278 return; 1279 } 1280 1281 vfs_timestamp(&now); 1282 1283 TMPFS_NODE_LOCK(node); 1284 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1285 if (acc == NULL) 1286 acc = &now; 1287 node->tn_atime = acc->tv_sec; 1288 node->tn_atimensec = acc->tv_nsec; 1289 } 1290 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1291 if (mod == NULL) 1292 mod = &now; 1293 node->tn_mtime = mod->tv_sec; 1294 node->tn_mtimensec = mod->tv_nsec; 1295 } 1296 if (node->tn_status & TMPFS_NODE_CHANGED) { 1297 node->tn_ctime = now.tv_sec; 1298 node->tn_ctimensec = now.tv_nsec; 1299 } 1300 1301 node->tn_status &= ~(TMPFS_NODE_ACCESSED | 1302 TMPFS_NODE_MODIFIED | 1303 TMPFS_NODE_CHANGED); 1304 TMPFS_NODE_UNLOCK(node); 1305 } 1306 1307 /* --------------------------------------------------------------------- */ 1308 1309 void 1310 tmpfs_update(struct vnode *vp) 1311 { 1312 tmpfs_itimes(vp, NULL, NULL); 1313 } 1314 1315 /* --------------------------------------------------------------------- */ 1316 1317 /* 1318 * Caller must hold an exclusive node lock. 1319 */ 1320 int 1321 tmpfs_truncate(struct vnode *vp, off_t length) 1322 { 1323 int error; 1324 struct tmpfs_node *node; 1325 1326 node = VP_TO_TMPFS_NODE(vp); 1327 1328 if (length < 0) { 1329 error = EINVAL; 1330 goto out; 1331 } 1332 1333 if (node->tn_size == length) { 1334 error = 0; 1335 goto out; 1336 } 1337 1338 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1339 return (EFBIG); 1340 1341 1342 error = tmpfs_reg_resize(vp, length, 1); 1343 1344 if (error == 0) 1345 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1346 1347 out: 1348 tmpfs_update(vp); 1349 1350 return error; 1351 } 1352 1353 /* --------------------------------------------------------------------- */ 1354 1355 static ino_t 1356 tmpfs_fetch_ino(struct tmpfs_mount *tmp) 1357 { 1358 ino_t ret; 1359 1360 ret = atomic_fetchadd_64(&tmp->tm_ino, 1); 1361 1362 return (ret); 1363 } 1364 1365 static int 1366 tmpfs_dirtree_compare(struct tmpfs_dirent *a, struct tmpfs_dirent *b) 1367 { 1368 if (a->td_namelen > b->td_namelen) 1369 return 1; 1370 else if (a->td_namelen < b->td_namelen) 1371 return -1; 1372 else 1373 return strncmp(a->td_name, b->td_name, a->td_namelen); 1374 } 1375 1376 static int 1377 tmpfs_dirtree_compare_cookie(struct tmpfs_dirent *a, struct tmpfs_dirent *b) 1378 { 1379 if (a < b) 1380 return(-1); 1381 if (a > b) 1382 return(1); 1383 return 0; 1384 } 1385 1386 /* 1387 * Lock for rename. The namecache entries are already locked so 1388 * theoretically we should be able to lock the directories in any 1389 * order. Underlying files must be locked after the related directory. 1390 */ 1391 void 1392 tmpfs_lock4(struct tmpfs_node *node1, struct tmpfs_node *node2, 1393 struct tmpfs_node *node3, struct tmpfs_node *node4) 1394 { 1395 TMPFS_NODE_LOCK(node1); /* fdir */ 1396 TMPFS_NODE_LOCK(node3); /* ffile */ 1397 TMPFS_NODE_LOCK(node2); /* tdir */ 1398 if (node4) 1399 TMPFS_NODE_LOCK(node4); /* tfile */ 1400 } 1401 1402 void 1403 tmpfs_unlock4(struct tmpfs_node *node1, struct tmpfs_node *node2, 1404 struct tmpfs_node *node3, struct tmpfs_node *node4) 1405 { 1406 if (node4) 1407 TMPFS_NODE_UNLOCK(node4); 1408 TMPFS_NODE_UNLOCK(node2); 1409 TMPFS_NODE_UNLOCK(node3); 1410 TMPFS_NODE_UNLOCK(node1); 1411 } 1412