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/namei.h> 40 #include <sys/priv.h> 41 #include <sys/proc.h> 42 #include <sys/stat.h> 43 #include <sys/systm.h> 44 #include <sys/vnode.h> 45 #include <sys/vmmeter.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_object.h> 49 #include <vm/vm_page.h> 50 #include <vm/vm_pager.h> 51 #include <vm/vm_extern.h> 52 #include <vm/vm_pageout.h> 53 #include <vm/vm_page2.h> 54 55 #include <vfs/tmpfs/tmpfs.h> 56 #include <vfs/tmpfs/tmpfs_vnops.h> 57 58 static ino_t tmpfs_fetch_ino(struct tmpfs_mount *); 59 60 static int tmpfs_dirtree_compare(struct tmpfs_dirent *a, 61 struct tmpfs_dirent *b); 62 RB_GENERATE(tmpfs_dirtree, tmpfs_dirent, rb_node, tmpfs_dirtree_compare); 63 64 static int tmpfs_dirtree_compare_cookie(struct tmpfs_dirent *a, 65 struct tmpfs_dirent *b); 66 RB_GENERATE(tmpfs_dirtree_cookie, tmpfs_dirent, 67 rb_cookienode, tmpfs_dirtree_compare_cookie); 68 69 70 /* --------------------------------------------------------------------- */ 71 72 /* 73 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 74 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 75 * using the credentials of the process 'p'. 76 * 77 * If the node type is set to 'VDIR', then the parent parameter must point 78 * to the parent directory of the node being created. It may only be NULL 79 * while allocating the root node. 80 * 81 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 82 * specifies the device the node represents. 83 * 84 * If the node type is set to 'VLNK', then the parameter target specifies 85 * the file name of the target file for the symbolic link that is being 86 * created. 87 * 88 * Note that new nodes are retrieved from the available list if it has 89 * items or, if it is empty, from the node pool as long as there is enough 90 * space to create them. 91 * 92 * Returns zero on success or an appropriate error code on failure. 93 */ 94 int 95 tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type, 96 uid_t uid, gid_t gid, mode_t mode, 97 char *target, int rmajor, int rminor, 98 struct tmpfs_node **node) 99 { 100 struct tmpfs_node *nnode; 101 struct timespec ts; 102 dev_t rdev; 103 104 KKASSERT(IFF(type == VLNK, target != NULL)); 105 KKASSERT(IFF(type == VBLK || type == VCHR, rmajor != VNOVAL)); 106 107 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max) 108 return (ENOSPC); 109 110 nnode = objcache_get(tmp->tm_node_pool, M_WAITOK | M_NULLOK); 111 if (nnode == NULL) 112 return (ENOSPC); 113 114 /* Generic initialization. */ 115 nnode->tn_type = type; 116 vfs_timestamp(&ts); 117 nnode->tn_ctime = nnode->tn_mtime = nnode->tn_atime 118 = ts.tv_sec; 119 nnode->tn_ctimensec = nnode->tn_mtimensec = nnode->tn_atimensec 120 = ts.tv_nsec; 121 nnode->tn_uid = uid; 122 nnode->tn_gid = gid; 123 nnode->tn_mode = mode; 124 nnode->tn_id = tmpfs_fetch_ino(tmp); 125 nnode->tn_advlock.init_done = 0; 126 KKASSERT(nnode->tn_links == 0); 127 128 /* Type-specific initialization. */ 129 switch (nnode->tn_type) { 130 case VBLK: 131 case VCHR: 132 rdev = makeudev(rmajor, rminor); 133 if (rdev == NOUDEV) { 134 objcache_put(tmp->tm_node_pool, nnode); 135 return(EINVAL); 136 } 137 nnode->tn_rdev = rdev; 138 break; 139 140 case VDIR: 141 RB_INIT(&nnode->tn_dir.tn_dirtree); 142 RB_INIT(&nnode->tn_dir.tn_cookietree); 143 nnode->tn_dir.tn_parent = NULL; 144 nnode->tn_size = 0; 145 break; 146 147 case VFIFO: 148 /* FALLTHROUGH */ 149 case VSOCK: 150 break; 151 152 case VLNK: 153 nnode->tn_size = strlen(target); 154 nnode->tn_link = kmalloc(nnode->tn_size + 1, tmp->tm_name_zone, 155 M_WAITOK | M_NULLOK); 156 if (nnode->tn_link == NULL) { 157 objcache_put(tmp->tm_node_pool, nnode); 158 return (ENOSPC); 159 } 160 bcopy(target, nnode->tn_link, nnode->tn_size); 161 nnode->tn_link[nnode->tn_size] = '\0'; 162 break; 163 164 case VREG: 165 nnode->tn_reg.tn_aobj = swap_pager_alloc(NULL, 0, 166 VM_PROT_DEFAULT, 0); 167 nnode->tn_reg.tn_aobj_pages = 0; 168 nnode->tn_size = 0; 169 vm_object_set_flag(nnode->tn_reg.tn_aobj, OBJ_NOPAGEIN); 170 break; 171 172 default: 173 panic("tmpfs_alloc_node: type %p %d", nnode, (int)nnode->tn_type); 174 } 175 176 TMPFS_NODE_LOCK(nnode); 177 TMPFS_LOCK(tmp); 178 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 179 tmp->tm_nodes_inuse++; 180 TMPFS_UNLOCK(tmp); 181 TMPFS_NODE_UNLOCK(nnode); 182 183 *node = nnode; 184 return 0; 185 } 186 187 /* --------------------------------------------------------------------- */ 188 189 /* 190 * Destroys the node pointed to by node from the file system 'tmp'. 191 * If the node does not belong to the given mount point, the results are 192 * unpredicted. 193 * 194 * If the node references a directory; no entries are allowed because 195 * their removal could need a recursive algorithm, something forbidden in 196 * kernel space. Furthermore, there is not need to provide such 197 * functionality (recursive removal) because the only primitives offered 198 * to the user are the removal of empty directories and the deletion of 199 * individual files. 200 * 201 * Note that nodes are not really deleted; in fact, when a node has been 202 * allocated, it cannot be deleted during the whole life of the file 203 * system. Instead, they are moved to the available list and remain there 204 * until reused. 205 * 206 * A caller must have TMPFS_NODE_LOCK(node) and this function unlocks it. 207 */ 208 void 209 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 210 { 211 vm_pindex_t pages = 0; 212 213 #ifdef INVARIANTS 214 TMPFS_ASSERT_ELOCKED(node); 215 KKASSERT(node->tn_vnode == NULL); 216 #endif 217 218 TMPFS_LOCK(tmp); 219 LIST_REMOVE(node, tn_entries); 220 tmp->tm_nodes_inuse--; 221 TMPFS_UNLOCK(tmp); 222 TMPFS_NODE_UNLOCK(node); /* Caller has this lock */ 223 224 switch (node->tn_type) { 225 case VNON: 226 /* Do not do anything. VNON is provided to let the 227 * allocation routine clean itself easily by avoiding 228 * duplicating code in it. */ 229 /* FALLTHROUGH */ 230 case VBLK: 231 /* FALLTHROUGH */ 232 case VCHR: 233 /* FALLTHROUGH */ 234 break; 235 case VDIR: 236 /* 237 * The parent link can be NULL if this is the root 238 * node or if it is a directory node that was rmdir'd. 239 * 240 * XXX what if node is a directory which still contains 241 * directory entries (e.g. due to a forced umount) ? 242 */ 243 node->tn_size = 0; 244 KKASSERT(node->tn_dir.tn_parent == NULL); 245 246 /* 247 * If the root node is being destroyed don't leave a 248 * dangling pointer in tmpfs_mount. 249 */ 250 if (node == tmp->tm_root) 251 tmp->tm_root = NULL; 252 break; 253 case VFIFO: 254 /* FALLTHROUGH */ 255 case VSOCK: 256 break; 257 258 case VLNK: 259 kfree(node->tn_link, tmp->tm_name_zone); 260 node->tn_link = NULL; 261 node->tn_size = 0; 262 break; 263 264 case VREG: 265 if (node->tn_reg.tn_aobj != NULL) 266 vm_object_deallocate(node->tn_reg.tn_aobj); 267 node->tn_reg.tn_aobj = NULL; 268 pages = node->tn_reg.tn_aobj_pages; 269 break; 270 271 default: 272 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type); 273 } 274 275 /* 276 * Clean up fields for the next allocation. The objcache only ctors 277 * new allocations. 278 */ 279 tmpfs_node_ctor(node, NULL, 0); 280 objcache_put(tmp->tm_node_pool, node); 281 /* node is now invalid */ 282 283 if (pages) 284 atomic_add_long(&tmp->tm_pages_used, -(long)pages); 285 } 286 287 /* --------------------------------------------------------------------- */ 288 289 /* 290 * Allocates a new directory entry for the node node with a name of name. 291 * The new directory entry is returned in *de. 292 * 293 * The link count of node is increased by one to reflect the new object 294 * referencing it. 295 * 296 * Returns zero on success or an appropriate error code on failure. 297 */ 298 int 299 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 300 const char *name, uint16_t len, struct tmpfs_dirent **de) 301 { 302 struct tmpfs_dirent *nde; 303 304 nde = objcache_get(tmp->tm_dirent_pool, M_WAITOK); 305 nde->td_name = kmalloc(len + 1, tmp->tm_name_zone, M_WAITOK | M_NULLOK); 306 if (nde->td_name == NULL) { 307 objcache_put(tmp->tm_dirent_pool, nde); 308 *de = NULL; 309 return (ENOSPC); 310 } 311 nde->td_namelen = len; 312 bcopy(name, nde->td_name, len); 313 nde->td_name[len] = '\0'; 314 315 nde->td_node = node; 316 317 atomic_add_int(&node->tn_links, 1); 318 319 *de = nde; 320 321 return 0; 322 } 323 324 /* --------------------------------------------------------------------- */ 325 326 /* 327 * Frees a directory entry. It is the caller's responsibility to destroy 328 * the node referenced by it if needed. 329 * 330 * The link count of node is decreased by one to reflect the removal of an 331 * object that referenced it. This only happens if 'node_exists' is true; 332 * otherwise the function will not access the node referred to by the 333 * directory entry, as it may already have been released from the outside. 334 */ 335 void 336 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de) 337 { 338 struct tmpfs_node *node; 339 340 node = de->td_node; 341 342 KKASSERT(node->tn_links > 0); 343 atomic_add_int(&node->tn_links, -1); 344 345 kfree(de->td_name, tmp->tm_name_zone); 346 de->td_namelen = 0; 347 de->td_name = NULL; 348 de->td_node = NULL; 349 objcache_put(tmp->tm_dirent_pool, de); 350 } 351 352 /* --------------------------------------------------------------------- */ 353 354 /* 355 * Allocates a new vnode for the node node or returns a new reference to 356 * an existing one if the node had already a vnode referencing it. The 357 * resulting locked vnode is returned in *vpp. 358 * 359 * Returns zero on success or an appropriate error code on failure. 360 * 361 * The caller must ensure that node cannot go away (usually by holding 362 * the related directory entry). 363 * 364 * If dnode is non-NULL this routine avoids deadlocking against it but 365 * can return EAGAIN. Caller must try again. The dnode lock will cycle 366 * in this case, it remains locked on return in all cases. dnode must 367 * be shared-locked. 368 */ 369 int 370 tmpfs_alloc_vp(struct mount *mp, 371 struct tmpfs_node *dnode, struct tmpfs_node *node, int lkflag, 372 struct vnode **vpp) 373 { 374 int error = 0; 375 struct vnode *vp; 376 377 loop: 378 vp = NULL; 379 if (node->tn_vnode == NULL) { 380 error = getnewvnode(VT_TMPFS, mp, &vp, 381 VLKTIMEOUT, LK_CANRECURSE); 382 if (error) 383 goto out; 384 } 385 386 /* 387 * Interlocked extraction from node. This can race many things. 388 * We have to get a soft reference on the vnode while we hold 389 * the node locked, then acquire it properly and check for races. 390 */ 391 TMPFS_NODE_LOCK(node); 392 if (node->tn_vnode) { 393 if (vp) { 394 vp->v_type = VBAD; 395 vx_put(vp); 396 } 397 vp = node->tn_vnode; 398 399 KKASSERT((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0); 400 vhold(vp); 401 TMPFS_NODE_UNLOCK(node); 402 403 if (dnode) { 404 /* 405 * Special-case handling to avoid deadlocking against 406 * dnode. This case has been validated and occurs 407 * every so often during synth builds. 408 */ 409 if (vget(vp, (lkflag & ~LK_RETRY) | 410 LK_NOWAIT | 411 LK_EXCLUSIVE) != 0) { 412 TMPFS_NODE_UNLOCK(dnode); 413 if (vget(vp, (lkflag & ~LK_RETRY) | 414 LK_SLEEPFAIL | 415 LK_EXCLUSIVE) == 0) { 416 vn_unlock(vp); 417 } 418 vdrop(vp); 419 TMPFS_NODE_LOCK_SH(dnode); 420 421 return EAGAIN; 422 } 423 } else { 424 /* 425 * Normal path 426 */ 427 if (vget(vp, lkflag | LK_EXCLUSIVE) != 0) { 428 vdrop(vp); 429 goto loop; 430 } 431 } 432 if (node->tn_vnode != vp) { 433 vput(vp); 434 vdrop(vp); 435 goto loop; 436 } 437 vdrop(vp); 438 goto out; 439 } 440 441 /* 442 * We need to assign node->tn_vnode. If vp is NULL, loop up to 443 * allocate the vp. This can happen due to SMP races. 444 */ 445 if (vp == NULL) { 446 TMPFS_NODE_UNLOCK(node); 447 goto loop; 448 } 449 450 /* 451 * This should never happen. 452 */ 453 if (node->tn_vpstate & TMPFS_VNODE_DOOMED) { 454 TMPFS_NODE_UNLOCK(node); 455 vp->v_type = VBAD; 456 vx_put(vp); 457 error = ENOENT; 458 goto out; 459 } 460 461 KKASSERT(node->tn_vnode == NULL); 462 KKASSERT(vp != NULL); 463 vp->v_data = node; 464 vp->v_type = node->tn_type; 465 466 /* Type-specific initialization. */ 467 switch (node->tn_type) { 468 case VBLK: 469 /* FALLTHROUGH */ 470 case VCHR: 471 /* FALLTHROUGH */ 472 case VSOCK: 473 break; 474 case VREG: 475 /* 476 * VMIO is mandatory. Tmpfs also supports KVABIO 477 * for its tmpfs_strategy(). 478 */ 479 vsetflags(vp, VKVABIO); 480 vinitvmio(vp, node->tn_size, node->tn_blksize, -1); 481 break; 482 case VLNK: 483 break; 484 case VFIFO: 485 vp->v_ops = &mp->mnt_vn_fifo_ops; 486 break; 487 case VDIR: 488 break; 489 490 default: 491 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 492 } 493 494 node->tn_vnode = vp; 495 TMPFS_NODE_UNLOCK(node); 496 497 vx_downgrade(vp); 498 out: 499 *vpp = vp; 500 KKASSERT(IFF(error == 0, *vpp != NULL && vn_islocked(*vpp))); 501 502 return error; 503 } 504 505 /* --------------------------------------------------------------------- */ 506 507 /* 508 * Allocates a new file of type 'type' and adds it to the parent directory 509 * 'dvp'; this addition is done using the component name given in 'cnp'. 510 * The ownership of the new file is automatically assigned based on the 511 * credentials of the caller (through 'cnp'), the group is set based on 512 * the parent directory and the mode is determined from the 'vap' argument. 513 * If successful, *vpp holds a vnode to the newly created file and zero 514 * is returned. Otherwise *vpp is NULL and the function returns an 515 * appropriate error code. 516 */ 517 int 518 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 519 struct namecache *ncp, struct ucred *cred, char *target) 520 { 521 int error; 522 struct tmpfs_dirent *de; 523 struct tmpfs_mount *tmp; 524 struct tmpfs_node *dnode; 525 struct tmpfs_node *node; 526 527 tmp = VFS_TO_TMPFS(dvp->v_mount); 528 dnode = VP_TO_TMPFS_DIR(dvp); 529 *vpp = NULL; 530 531 /* 532 * If the directory was removed but a process was CD'd into it, 533 * we do not allow any more file/dir creation within it. Otherwise 534 * we will lose track of it. 535 */ 536 KKASSERT(dnode->tn_type == VDIR); 537 if (dnode != tmp->tm_root && dnode->tn_dir.tn_parent == NULL) 538 return ENOENT; 539 540 /* 541 * Make sure the link count does not overflow. 542 */ 543 if (vap->va_type == VDIR && dnode->tn_links >= LINK_MAX) 544 return EMLINK; 545 546 /* Allocate a node that represents the new file. */ 547 error = tmpfs_alloc_node(tmp, vap->va_type, cred->cr_uid, 548 dnode->tn_gid, vap->va_mode, target, 549 vap->va_rmajor, vap->va_rminor, &node); 550 if (error != 0) 551 return error; 552 TMPFS_NODE_LOCK(node); 553 554 /* Allocate a directory entry that points to the new file. */ 555 error = tmpfs_alloc_dirent(tmp, node, ncp->nc_name, ncp->nc_nlen, &de); 556 if (error != 0) { 557 tmpfs_free_node(tmp, node); 558 /* eats node lock */ 559 return error; 560 } 561 562 /* Allocate a vnode for the new file. */ 563 error = tmpfs_alloc_vp(dvp->v_mount, NULL, node, LK_EXCLUSIVE, vpp); 564 if (error != 0) { 565 tmpfs_free_dirent(tmp, de); 566 tmpfs_free_node(tmp, node); 567 /* eats node lock */ 568 return error; 569 } 570 571 /* 572 * Now that all required items are allocated, we can proceed to 573 * insert the new node into the directory, an operation that 574 * cannot fail. 575 */ 576 tmpfs_dir_attach(dnode, de); 577 TMPFS_NODE_UNLOCK(node); 578 579 return error; 580 } 581 582 /* --------------------------------------------------------------------- */ 583 584 /* 585 * Attaches the directory entry de to the directory represented by dnode. 586 * Note that this does not change the link count of the node pointed by 587 * the directory entry, as this is done by tmpfs_alloc_dirent. 588 */ 589 void 590 tmpfs_dir_attach(struct tmpfs_node *dnode, struct tmpfs_dirent *de) 591 { 592 struct tmpfs_node *node = de->td_node; 593 594 TMPFS_NODE_LOCK(dnode); 595 if (node && node->tn_type == VDIR) { 596 TMPFS_NODE_LOCK(node); 597 atomic_add_int(&node->tn_links, 1); 598 node->tn_status |= TMPFS_NODE_CHANGED; 599 node->tn_dir.tn_parent = dnode; 600 atomic_add_int(&dnode->tn_links, 1); 601 TMPFS_NODE_UNLOCK(node); 602 } 603 RB_INSERT(tmpfs_dirtree, &dnode->tn_dir.tn_dirtree, de); 604 RB_INSERT(tmpfs_dirtree_cookie, &dnode->tn_dir.tn_cookietree, de); 605 dnode->tn_size += sizeof(struct tmpfs_dirent); 606 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 607 TMPFS_NODE_MODIFIED; 608 TMPFS_NODE_UNLOCK(dnode); 609 } 610 611 /* --------------------------------------------------------------------- */ 612 613 /* 614 * Detaches the directory entry de from the directory represented by dnode. 615 * Note that this does not change the link count of the node pointed by 616 * the directory entry, as this is done by tmpfs_free_dirent. 617 */ 618 void 619 tmpfs_dir_detach(struct tmpfs_node *dnode, struct tmpfs_dirent *de) 620 { 621 struct tmpfs_node *node = de->td_node; 622 623 TMPFS_NODE_LOCK(dnode); 624 RB_REMOVE(tmpfs_dirtree, &dnode->tn_dir.tn_dirtree, de); 625 RB_REMOVE(tmpfs_dirtree_cookie, &dnode->tn_dir.tn_cookietree, de); 626 dnode->tn_size -= sizeof(struct tmpfs_dirent); 627 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 628 TMPFS_NODE_MODIFIED; 629 TMPFS_NODE_UNLOCK(dnode); 630 631 /* 632 * Clean out the tn_parent pointer immediately when removing a 633 * directory. 634 * 635 * Removal of the parent linkage also cleans out the extra tn_links 636 * count we had on both node and dnode. 637 * 638 * node can be NULL (typ during a forced umount), in which case 639 * the mount code is dealing with the linkages from a linked list 640 * scan. 641 */ 642 if (node && node->tn_type == VDIR && node->tn_dir.tn_parent) { 643 TMPFS_NODE_LOCK(dnode); 644 TMPFS_NODE_LOCK(node); 645 KKASSERT(node->tn_dir.tn_parent == dnode); 646 atomic_add_int(&dnode->tn_links, -1); 647 atomic_add_int(&node->tn_links, -1); 648 node->tn_dir.tn_parent = NULL; 649 TMPFS_NODE_UNLOCK(node); 650 TMPFS_NODE_UNLOCK(dnode); 651 } 652 } 653 654 /* --------------------------------------------------------------------- */ 655 656 /* 657 * Looks for a directory entry in the directory represented by node. 658 * 'ncp' describes the name of the entry to look for. Note that the . 659 * and .. components are not allowed as they do not physically exist 660 * within directories. 661 * 662 * Returns a pointer to the entry when found, otherwise NULL. 663 * 664 * Caller must hold the node locked (shared ok) 665 */ 666 struct tmpfs_dirent * 667 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 668 struct namecache *ncp) 669 { 670 struct tmpfs_dirent *de; 671 int len = ncp->nc_nlen; 672 struct tmpfs_dirent wanted; 673 674 wanted.td_namelen = len; 675 wanted.td_name = ncp->nc_name; 676 677 TMPFS_VALIDATE_DIR(node); 678 679 de = RB_FIND(tmpfs_dirtree, &node->tn_dir.tn_dirtree, &wanted); 680 681 KKASSERT(f == NULL || de == NULL || f == de->td_node); 682 683 return de; 684 } 685 686 /* --------------------------------------------------------------------- */ 687 688 /* 689 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 690 * directory and returns it in the uio space. The function returns 0 691 * on success, -1 if there was not enough space in the uio structure to 692 * hold the directory entry or an appropriate error code if another 693 * error happens. 694 */ 695 int 696 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 697 { 698 int error; 699 700 TMPFS_VALIDATE_DIR(node); 701 KKASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 702 703 if (vop_write_dirent(&error, uio, node->tn_id, DT_DIR, 1, ".")) 704 return -1; 705 if (error == 0) 706 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 707 return error; 708 } 709 710 /* --------------------------------------------------------------------- */ 711 712 /* 713 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 714 * directory and returns it in the uio space. The function returns 0 715 * on success, -1 if there was not enough space in the uio structure to 716 * hold the directory entry or an appropriate error code if another 717 * error happens. 718 */ 719 int 720 tmpfs_dir_getdotdotdent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 721 struct uio *uio) 722 { 723 int error; 724 ino_t d_ino; 725 726 TMPFS_VALIDATE_DIR(node); 727 KKASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 728 729 if (node->tn_dir.tn_parent) { 730 TMPFS_NODE_LOCK(node); 731 if (node->tn_dir.tn_parent) 732 d_ino = node->tn_dir.tn_parent->tn_id; 733 else 734 d_ino = tmp->tm_root->tn_id; 735 TMPFS_NODE_UNLOCK(node); 736 } else { 737 d_ino = tmp->tm_root->tn_id; 738 } 739 740 if (vop_write_dirent(&error, uio, d_ino, DT_DIR, 2, "..")) 741 return -1; 742 if (error == 0) { 743 struct tmpfs_dirent *de; 744 de = RB_MIN(tmpfs_dirtree_cookie, &node->tn_dir.tn_cookietree); 745 if (de == NULL) 746 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 747 else 748 uio->uio_offset = tmpfs_dircookie(de); 749 } 750 return error; 751 } 752 753 /* --------------------------------------------------------------------- */ 754 755 /* 756 * Lookup a directory entry by its associated cookie. 757 * 758 * Must be called with the directory node locked (shared ok) 759 */ 760 struct lubycookie_info { 761 off_t cookie; 762 struct tmpfs_dirent *de; 763 }; 764 765 static int 766 lubycookie_cmp(struct tmpfs_dirent *de, void *arg) 767 { 768 struct lubycookie_info *info = arg; 769 off_t cookie = tmpfs_dircookie(de); 770 771 if (cookie < info->cookie) 772 return(-1); 773 if (cookie > info->cookie) 774 return(1); 775 return(0); 776 } 777 778 static int 779 lubycookie_callback(struct tmpfs_dirent *de, void *arg) 780 { 781 struct lubycookie_info *info = arg; 782 783 if (tmpfs_dircookie(de) == info->cookie) { 784 info->de = de; 785 return(-1); 786 } 787 return(0); 788 } 789 790 struct tmpfs_dirent * 791 tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie) 792 { 793 struct lubycookie_info info; 794 795 info.cookie = cookie; 796 info.de = NULL; 797 RB_SCAN(tmpfs_dirtree_cookie, &node->tn_dir.tn_cookietree, 798 lubycookie_cmp, lubycookie_callback, &info); 799 return (info.de); 800 } 801 802 /* --------------------------------------------------------------------- */ 803 804 /* 805 * Helper function for tmpfs_readdir. Returns as much directory entries 806 * as can fit in the uio space. The read starts at uio->uio_offset. 807 * The function returns 0 on success, -1 if there was not enough space 808 * in the uio structure to hold the directory entry or an appropriate 809 * error code if another error happens. 810 * 811 * Caller must hold the node locked (shared ok) 812 */ 813 int 814 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp) 815 { 816 int error; 817 off_t startcookie; 818 struct tmpfs_dirent *de; 819 820 TMPFS_VALIDATE_DIR(node); 821 822 /* 823 * Locate the first directory entry we have to return. We have cached 824 * the last readdir in the node, so use those values if appropriate. 825 * Otherwise do a linear scan to find the requested entry. 826 */ 827 startcookie = uio->uio_offset; 828 KKASSERT(startcookie != TMPFS_DIRCOOKIE_DOT); 829 KKASSERT(startcookie != TMPFS_DIRCOOKIE_DOTDOT); 830 831 if (startcookie == TMPFS_DIRCOOKIE_EOF) 832 return 0; 833 834 de = tmpfs_dir_lookupbycookie(node, startcookie); 835 if (de == NULL) 836 return EINVAL; 837 838 /* 839 * Read as much entries as possible; i.e., until we reach the end of 840 * the directory or we exhaust uio space. 841 */ 842 do { 843 ino_t d_ino; 844 uint8_t d_type; 845 846 /* Create a dirent structure representing the current 847 * tmpfs_node and fill it. */ 848 d_ino = de->td_node->tn_id; 849 switch (de->td_node->tn_type) { 850 case VBLK: 851 d_type = DT_BLK; 852 break; 853 854 case VCHR: 855 d_type = DT_CHR; 856 break; 857 858 case VDIR: 859 d_type = DT_DIR; 860 break; 861 862 case VFIFO: 863 d_type = DT_FIFO; 864 break; 865 866 case VLNK: 867 d_type = DT_LNK; 868 break; 869 870 case VREG: 871 d_type = DT_REG; 872 break; 873 874 case VSOCK: 875 d_type = DT_SOCK; 876 break; 877 878 default: 879 panic("tmpfs_dir_getdents: type %p %d", 880 de->td_node, (int)de->td_node->tn_type); 881 } 882 KKASSERT(de->td_namelen < 256); /* 255 + 1 */ 883 884 if (vop_write_dirent(&error, uio, d_ino, d_type, 885 de->td_namelen, de->td_name)) { 886 error = -1; 887 break; 888 } 889 890 (*cntp)++; 891 de = RB_NEXT(tmpfs_dirtree_cookie, 892 node->tn_dir.tn_cookietree, de); 893 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 894 895 /* Update the offset and cache. */ 896 if (de == NULL) { 897 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 898 } else { 899 uio->uio_offset = tmpfs_dircookie(de); 900 } 901 902 return error; 903 } 904 905 /* --------------------------------------------------------------------- */ 906 907 /* 908 * Resizes the aobj associated to the regular file pointed to by vp to 909 * the size newsize. 'vp' must point to a vnode that represents a regular 910 * file. 'newsize' must be positive. 911 * 912 * pass NVEXTF_TRIVIAL when buf content will be overwritten, otherwise set 0 913 * to be zero filled. 914 * 915 * Returns zero on success or an appropriate error code on failure. 916 * 917 * Caller must hold the node exclusively locked. 918 */ 919 int 920 tmpfs_reg_resize(struct vnode *vp, off_t newsize, int trivial) 921 { 922 int error; 923 vm_pindex_t newpages, oldpages; 924 struct tmpfs_mount *tmp; 925 struct tmpfs_node *node; 926 off_t oldsize; 927 int nvextflags; 928 929 #ifdef INVARIANTS 930 KKASSERT(vp->v_type == VREG); 931 KKASSERT(newsize >= 0); 932 #endif 933 934 node = VP_TO_TMPFS_NODE(vp); 935 tmp = VFS_TO_TMPFS(vp->v_mount); 936 937 /* 938 * Convert the old and new sizes to the number of pages needed to 939 * store them. It may happen that we do not need to do anything 940 * because the last allocated page can accommodate the change on 941 * its own. 942 */ 943 oldsize = node->tn_size; 944 oldpages = round_page64(oldsize) / PAGE_SIZE; 945 KKASSERT(oldpages == node->tn_reg.tn_aobj_pages); 946 newpages = round_page64(newsize) / PAGE_SIZE; 947 948 if (newpages > oldpages && 949 tmp->tm_pages_used + newpages - oldpages > tmp->tm_pages_max) { 950 error = ENOSPC; 951 goto out; 952 } 953 node->tn_reg.tn_aobj_pages = newpages; 954 node->tn_size = newsize; 955 956 if (newpages != oldpages) 957 atomic_add_long(&tmp->tm_pages_used, (newpages - oldpages)); 958 959 /* 960 * nvextflags to pass along for bdwrite() vs buwrite() 961 */ 962 if (vm_pages_needed || vm_paging_needed(0) || 963 tmpfs_bufcache_mode >= 2) { 964 nvextflags = 0; 965 } else { 966 nvextflags = NVEXTF_BUWRITE; 967 } 968 969 970 /* 971 * When adjusting the vnode filesize and its VM object we must 972 * also adjust our backing VM object (aobj). The blocksize 973 * used must match the block sized we use for the buffer cache. 974 * 975 * The backing VM object may contain VM pages as well as swap 976 * assignments if we previously renamed main object pages into 977 * it during deactivation. 978 * 979 * To make things easier tmpfs uses a blksize in multiples of 980 * PAGE_SIZE, and will only increase the blksize as a small file 981 * increases in size. Once a file has exceeded TMPFS_BLKSIZE (16KB), 982 * the blksize is maxed out. Truncating the file does not reduce 983 * the blksize. 984 */ 985 if (newsize < oldsize) { 986 vm_pindex_t osize; 987 vm_pindex_t nsize; 988 vm_object_t aobj; 989 990 error = nvtruncbuf(vp, newsize, node->tn_blksize, 991 -1, nvextflags); 992 aobj = node->tn_reg.tn_aobj; 993 if (aobj) { 994 osize = aobj->size; 995 nsize = vp->v_object->size; 996 if (nsize < osize) { 997 aobj->size = osize; 998 swap_pager_freespace(aobj, nsize, 999 osize - nsize); 1000 vm_object_page_remove(aobj, nsize, osize, 1001 FALSE); 1002 } 1003 } 1004 } else { 1005 vm_object_t aobj; 1006 int nblksize; 1007 1008 /* 1009 * The first (and only the first) buffer in the file is resized 1010 * in multiples of PAGE_SIZE, up to TMPFS_BLKSIZE. 1011 */ 1012 nblksize = node->tn_blksize; 1013 while (nblksize < TMPFS_BLKSIZE && 1014 nblksize < newsize) { 1015 nblksize += PAGE_SIZE; 1016 } 1017 1018 if (trivial) 1019 nvextflags |= NVEXTF_TRIVIAL; 1020 1021 error = nvextendbuf(vp, oldsize, newsize, 1022 node->tn_blksize, nblksize, 1023 -1, -1, nvextflags); 1024 node->tn_blksize = nblksize; 1025 aobj = node->tn_reg.tn_aobj; 1026 if (aobj) 1027 aobj->size = vp->v_object->size; 1028 } 1029 1030 out: 1031 return error; 1032 } 1033 1034 /* --------------------------------------------------------------------- */ 1035 1036 /* 1037 * Change flags of the given vnode. 1038 * Caller should execute tmpfs_update on vp after a successful execution. 1039 * The vnode must be locked on entry and remain locked on exit. 1040 */ 1041 int 1042 tmpfs_chflags(struct vnode *vp, u_long vaflags, struct ucred *cred) 1043 { 1044 int error; 1045 struct tmpfs_node *node; 1046 int flags; 1047 1048 KKASSERT(vn_islocked(vp)); 1049 1050 node = VP_TO_TMPFS_NODE(vp); 1051 flags = node->tn_flags; 1052 1053 /* Disallow this operation if the file system is mounted read-only. */ 1054 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1055 return EROFS; 1056 error = vop_helper_setattr_flags(&flags, vaflags, node->tn_uid, cred); 1057 1058 /* Actually change the flags on the node itself */ 1059 if (error == 0) { 1060 TMPFS_NODE_LOCK(node); 1061 node->tn_flags = flags; 1062 node->tn_status |= TMPFS_NODE_CHANGED; 1063 TMPFS_NODE_UNLOCK(node); 1064 } 1065 1066 KKASSERT(vn_islocked(vp)); 1067 1068 return error; 1069 } 1070 1071 /* --------------------------------------------------------------------- */ 1072 1073 /* 1074 * Change access mode on the given vnode. 1075 * Caller should execute tmpfs_update on vp after a successful execution. 1076 * The vnode must be locked on entry and remain locked on exit. 1077 */ 1078 int 1079 tmpfs_chmod(struct vnode *vp, mode_t vamode, struct ucred *cred) 1080 { 1081 struct tmpfs_node *node; 1082 mode_t cur_mode; 1083 int error; 1084 1085 KKASSERT(vn_islocked(vp)); 1086 1087 node = VP_TO_TMPFS_NODE(vp); 1088 1089 /* Disallow this operation if the file system is mounted read-only. */ 1090 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1091 return EROFS; 1092 1093 /* Immutable or append-only files cannot be modified, either. */ 1094 if (node->tn_flags & (IMMUTABLE | APPEND)) 1095 return EPERM; 1096 1097 cur_mode = node->tn_mode; 1098 error = vop_helper_chmod(vp, vamode, cred, node->tn_uid, node->tn_gid, 1099 &cur_mode); 1100 1101 if (error == 0 && 1102 (node->tn_mode & ALLPERMS) != (cur_mode & ALLPERMS)) { 1103 TMPFS_NODE_LOCK(node); 1104 node->tn_mode &= ~ALLPERMS; 1105 node->tn_mode |= cur_mode & ALLPERMS; 1106 1107 node->tn_status |= TMPFS_NODE_CHANGED; 1108 TMPFS_NODE_UNLOCK(node); 1109 } 1110 1111 KKASSERT(vn_islocked(vp)); 1112 1113 return 0; 1114 } 1115 1116 /* --------------------------------------------------------------------- */ 1117 1118 /* 1119 * Change ownership of the given vnode. At least one of uid or gid must 1120 * be different than VNOVAL. If one is set to that value, the attribute 1121 * is unchanged. 1122 * Caller should execute tmpfs_update on vp after a successful execution. 1123 * The vnode must be locked on entry and remain locked on exit. 1124 */ 1125 int 1126 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred) 1127 { 1128 mode_t cur_mode; 1129 uid_t cur_uid; 1130 gid_t cur_gid; 1131 struct tmpfs_node *node; 1132 int error; 1133 1134 KKASSERT(vn_islocked(vp)); 1135 node = VP_TO_TMPFS_NODE(vp); 1136 1137 /* Disallow this operation if the file system is mounted read-only. */ 1138 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1139 return EROFS; 1140 1141 /* Immutable or append-only files cannot be modified, either. */ 1142 if (node->tn_flags & (IMMUTABLE | APPEND)) 1143 return EPERM; 1144 1145 cur_uid = node->tn_uid; 1146 cur_gid = node->tn_gid; 1147 cur_mode = node->tn_mode; 1148 error = vop_helper_chown(vp, uid, gid, cred, 1149 &cur_uid, &cur_gid, &cur_mode); 1150 1151 if (error == 0) { 1152 TMPFS_NODE_LOCK(node); 1153 if (cur_uid != node->tn_uid || 1154 cur_gid != node->tn_gid || 1155 cur_mode != node->tn_mode) { 1156 node->tn_uid = cur_uid; 1157 node->tn_gid = cur_gid; 1158 node->tn_mode = cur_mode; 1159 node->tn_status |= TMPFS_NODE_CHANGED; 1160 } 1161 TMPFS_NODE_UNLOCK(node); 1162 } 1163 1164 return error; 1165 } 1166 1167 /* --------------------------------------------------------------------- */ 1168 1169 /* 1170 * Change size of the given vnode. 1171 * Caller should execute tmpfs_update on vp after a successful execution. 1172 * The vnode must be locked on entry and remain locked on exit. 1173 */ 1174 int 1175 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred) 1176 { 1177 int error; 1178 struct tmpfs_node *node; 1179 1180 KKASSERT(vn_islocked(vp)); 1181 1182 node = VP_TO_TMPFS_NODE(vp); 1183 1184 /* Decide whether this is a valid operation based on the file type. */ 1185 error = 0; 1186 switch (vp->v_type) { 1187 case VDIR: 1188 return EISDIR; 1189 1190 case VREG: 1191 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1192 return EROFS; 1193 break; 1194 1195 case VBLK: 1196 /* FALLTHROUGH */ 1197 case VCHR: 1198 /* FALLTHROUGH */ 1199 case VFIFO: 1200 /* Allow modifications of special files even if in the file 1201 * system is mounted read-only (we are not modifying the 1202 * files themselves, but the objects they represent). */ 1203 return 0; 1204 1205 default: 1206 /* Anything else is unsupported. */ 1207 return EOPNOTSUPP; 1208 } 1209 1210 /* Immutable or append-only files cannot be modified, either. */ 1211 if (node->tn_flags & (IMMUTABLE | APPEND)) 1212 return EPERM; 1213 1214 error = tmpfs_truncate(vp, size); 1215 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1216 * for us, as will update tn_status; no need to do that here. */ 1217 1218 KKASSERT(vn_islocked(vp)); 1219 1220 return error; 1221 } 1222 1223 /* --------------------------------------------------------------------- */ 1224 1225 /* 1226 * Change access and modification times of the given vnode. 1227 * Caller should execute tmpfs_update on vp after a successful execution. 1228 * The vnode must be locked on entry and remain locked on exit. 1229 */ 1230 int 1231 tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime, 1232 int vaflags, struct ucred *cred) 1233 { 1234 struct tmpfs_node *node; 1235 1236 KKASSERT(vn_islocked(vp)); 1237 1238 node = VP_TO_TMPFS_NODE(vp); 1239 1240 /* Disallow this operation if the file system is mounted read-only. */ 1241 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1242 return EROFS; 1243 1244 /* Immutable or append-only files cannot be modified, either. */ 1245 if (node->tn_flags & (IMMUTABLE | APPEND)) 1246 return EPERM; 1247 1248 TMPFS_NODE_LOCK(node); 1249 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL) 1250 node->tn_status |= TMPFS_NODE_ACCESSED; 1251 1252 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL) { 1253 node->tn_status |= TMPFS_NODE_MODIFIED; 1254 vclrflags(vp, VLASTWRITETS); 1255 } 1256 1257 TMPFS_NODE_UNLOCK(node); 1258 1259 tmpfs_itimes(vp, atime, mtime); 1260 1261 KKASSERT(vn_islocked(vp)); 1262 1263 return 0; 1264 } 1265 1266 /* --------------------------------------------------------------------- */ 1267 /* Sync timestamps */ 1268 void 1269 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1270 const struct timespec *mod) 1271 { 1272 struct tmpfs_node *node; 1273 struct timespec now; 1274 1275 node = VP_TO_TMPFS_NODE(vp); 1276 1277 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1278 TMPFS_NODE_CHANGED)) == 0) { 1279 return; 1280 } 1281 1282 vfs_timestamp(&now); 1283 1284 TMPFS_NODE_LOCK(node); 1285 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1286 if (acc == NULL) 1287 acc = &now; 1288 node->tn_atime = acc->tv_sec; 1289 node->tn_atimensec = acc->tv_nsec; 1290 } 1291 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1292 if (mod == NULL) 1293 mod = &now; 1294 node->tn_mtime = mod->tv_sec; 1295 node->tn_mtimensec = mod->tv_nsec; 1296 } 1297 if (node->tn_status & TMPFS_NODE_CHANGED) { 1298 node->tn_ctime = now.tv_sec; 1299 node->tn_ctimensec = now.tv_nsec; 1300 } 1301 1302 node->tn_status &= ~(TMPFS_NODE_ACCESSED | 1303 TMPFS_NODE_MODIFIED | 1304 TMPFS_NODE_CHANGED); 1305 TMPFS_NODE_UNLOCK(node); 1306 } 1307 1308 /* --------------------------------------------------------------------- */ 1309 1310 void 1311 tmpfs_update(struct vnode *vp) 1312 { 1313 tmpfs_itimes(vp, NULL, NULL); 1314 } 1315 1316 /* --------------------------------------------------------------------- */ 1317 1318 /* 1319 * Caller must hold an exclusive node lock. 1320 */ 1321 int 1322 tmpfs_truncate(struct vnode *vp, off_t length) 1323 { 1324 int error; 1325 struct tmpfs_node *node; 1326 1327 node = VP_TO_TMPFS_NODE(vp); 1328 1329 if (length < 0) { 1330 error = EINVAL; 1331 goto out; 1332 } 1333 1334 if (node->tn_size == length) { 1335 error = 0; 1336 goto out; 1337 } 1338 1339 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1340 return (EFBIG); 1341 1342 1343 error = tmpfs_reg_resize(vp, length, 1); 1344 1345 if (error == 0) 1346 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1347 1348 out: 1349 tmpfs_update(vp); 1350 1351 return error; 1352 } 1353 1354 /* --------------------------------------------------------------------- */ 1355 1356 static ino_t 1357 tmpfs_fetch_ino(struct tmpfs_mount *tmp) 1358 { 1359 ino_t ret; 1360 1361 ret = atomic_fetchadd_64(&tmp->tm_ino, 1); 1362 1363 return (ret); 1364 } 1365 1366 static int 1367 tmpfs_dirtree_compare(struct tmpfs_dirent *a, struct tmpfs_dirent *b) 1368 { 1369 if (a->td_namelen > b->td_namelen) 1370 return 1; 1371 else if (a->td_namelen < b->td_namelen) 1372 return -1; 1373 else 1374 return strncmp(a->td_name, b->td_name, a->td_namelen); 1375 } 1376 1377 static int 1378 tmpfs_dirtree_compare_cookie(struct tmpfs_dirent *a, struct tmpfs_dirent *b) 1379 { 1380 if (a < b) 1381 return(-1); 1382 if (a > b) 1383 return(1); 1384 return 0; 1385 } 1386 1387 /* 1388 * Lock for rename. The namecache entries are already locked so 1389 * theoretically we should be able to lock the directories in any 1390 * order. Underlying files must be locked after the related directory. 1391 */ 1392 void 1393 tmpfs_lock4(struct tmpfs_node *node1, struct tmpfs_node *node2, 1394 struct tmpfs_node *node3, struct tmpfs_node *node4) 1395 { 1396 TMPFS_NODE_LOCK(node1); /* fdir */ 1397 TMPFS_NODE_LOCK(node3); /* ffile */ 1398 TMPFS_NODE_LOCK(node2); /* tdir */ 1399 if (node4) 1400 TMPFS_NODE_LOCK(node4); /* tfile */ 1401 } 1402 1403 void 1404 tmpfs_unlock4(struct tmpfs_node *node1, struct tmpfs_node *node2, 1405 struct tmpfs_node *node3, struct tmpfs_node *node4) 1406 { 1407 if (node4) 1408 TMPFS_NODE_UNLOCK(node4); 1409 TMPFS_NODE_UNLOCK(node2); 1410 TMPFS_NODE_UNLOCK(node3); 1411 TMPFS_NODE_UNLOCK(node1); 1412 } 1413