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 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/namei.h> 41 #include <sys/priv.h> 42 #include <sys/proc.h> 43 #include <sys/stat.h> 44 #include <sys/systm.h> 45 #include <sys/vnode.h> 46 #include <sys/vmmeter.h> 47 48 #include <vm/vm.h> 49 #include <vm/vm_object.h> 50 #include <vm/vm_page.h> 51 #include <vm/vm_pageout.h> 52 #include <vm/vm_pager.h> 53 #include <vm/vm_extern.h> 54 55 #include <fs/tmpfs/tmpfs.h> 56 #include <fs/tmpfs/tmpfs_fifoops.h> 57 #include <fs/tmpfs/tmpfs_vnops.h> 58 59 /* --------------------------------------------------------------------- */ 60 61 /* 62 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 63 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 64 * using the credentials of the process 'p'. 65 * 66 * If the node type is set to 'VDIR', then the parent parameter must point 67 * to the parent directory of the node being created. It may only be NULL 68 * while allocating the root node. 69 * 70 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 71 * specifies the device the node represents. 72 * 73 * If the node type is set to 'VLNK', then the parameter target specifies 74 * the file name of the target file for the symbolic link that is being 75 * created. 76 * 77 * Note that new nodes are retrieved from the available list if it has 78 * items or, if it is empty, from the node pool as long as there is enough 79 * space to create them. 80 * 81 * Returns zero on success or an appropriate error code on failure. 82 */ 83 int 84 tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type, 85 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent, 86 char *target, dev_t rdev, struct tmpfs_node **node) 87 { 88 struct tmpfs_node *nnode; 89 90 /* If the root directory of the 'tmp' file system is not yet 91 * allocated, this must be the request to do it. */ 92 MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR)); 93 94 MPASS(IFF(type == VLNK, target != NULL)); 95 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL)); 96 97 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max) 98 return (ENOSPC); 99 100 nnode = (struct tmpfs_node *)uma_zalloc_arg( 101 tmp->tm_node_pool, tmp, M_WAITOK); 102 103 /* Generic initialization. */ 104 nnode->tn_type = type; 105 vfs_timestamp(&nnode->tn_atime); 106 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime = 107 nnode->tn_atime; 108 nnode->tn_uid = uid; 109 nnode->tn_gid = gid; 110 nnode->tn_mode = mode; 111 nnode->tn_id = alloc_unr(tmp->tm_ino_unr); 112 113 /* Type-specific initialization. */ 114 switch (nnode->tn_type) { 115 case VBLK: 116 case VCHR: 117 nnode->tn_rdev = rdev; 118 break; 119 120 case VDIR: 121 TAILQ_INIT(&nnode->tn_dir.tn_dirhead); 122 MPASS(parent != nnode); 123 MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL)); 124 nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent; 125 nnode->tn_dir.tn_readdir_lastn = 0; 126 nnode->tn_dir.tn_readdir_lastp = NULL; 127 nnode->tn_links++; 128 TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent); 129 nnode->tn_dir.tn_parent->tn_links++; 130 TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent); 131 break; 132 133 case VFIFO: 134 /* FALLTHROUGH */ 135 case VSOCK: 136 break; 137 138 case VLNK: 139 MPASS(strlen(target) < MAXPATHLEN); 140 nnode->tn_size = strlen(target); 141 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME, 142 M_WAITOK); 143 memcpy(nnode->tn_link, target, nnode->tn_size); 144 break; 145 146 case VREG: 147 nnode->tn_reg.tn_aobj = 148 vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0, 149 NULL /* XXXKIB - tmpfs needs swap reservation */); 150 break; 151 152 default: 153 panic("tmpfs_alloc_node: type %p %d", nnode, (int)nnode->tn_type); 154 } 155 156 TMPFS_LOCK(tmp); 157 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 158 tmp->tm_nodes_inuse++; 159 TMPFS_UNLOCK(tmp); 160 161 *node = nnode; 162 return 0; 163 } 164 165 /* --------------------------------------------------------------------- */ 166 167 /* 168 * Destroys the node pointed to by node from the file system 'tmp'. 169 * If the node does not belong to the given mount point, the results are 170 * unpredicted. 171 * 172 * If the node references a directory; no entries are allowed because 173 * their removal could need a recursive algorithm, something forbidden in 174 * kernel space. Furthermore, there is not need to provide such 175 * functionality (recursive removal) because the only primitives offered 176 * to the user are the removal of empty directories and the deletion of 177 * individual files. 178 * 179 * Note that nodes are not really deleted; in fact, when a node has been 180 * allocated, it cannot be deleted during the whole life of the file 181 * system. Instead, they are moved to the available list and remain there 182 * until reused. 183 */ 184 void 185 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 186 { 187 vm_object_t uobj; 188 189 #ifdef INVARIANTS 190 TMPFS_NODE_LOCK(node); 191 MPASS(node->tn_vnode == NULL); 192 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0); 193 TMPFS_NODE_UNLOCK(node); 194 #endif 195 196 TMPFS_LOCK(tmp); 197 LIST_REMOVE(node, tn_entries); 198 tmp->tm_nodes_inuse--; 199 TMPFS_UNLOCK(tmp); 200 201 switch (node->tn_type) { 202 case VNON: 203 /* Do not do anything. VNON is provided to let the 204 * allocation routine clean itself easily by avoiding 205 * duplicating code in it. */ 206 /* FALLTHROUGH */ 207 case VBLK: 208 /* FALLTHROUGH */ 209 case VCHR: 210 /* FALLTHROUGH */ 211 case VDIR: 212 /* FALLTHROUGH */ 213 case VFIFO: 214 /* FALLTHROUGH */ 215 case VSOCK: 216 break; 217 218 case VLNK: 219 free(node->tn_link, M_TMPFSNAME); 220 break; 221 222 case VREG: 223 uobj = node->tn_reg.tn_aobj; 224 if (uobj != NULL) { 225 TMPFS_LOCK(tmp); 226 tmp->tm_pages_used -= uobj->size; 227 TMPFS_UNLOCK(tmp); 228 vm_object_deallocate(uobj); 229 } 230 break; 231 232 default: 233 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type); 234 } 235 236 free_unr(tmp->tm_ino_unr, node->tn_id); 237 uma_zfree(tmp->tm_node_pool, node); 238 } 239 240 /* --------------------------------------------------------------------- */ 241 242 /* 243 * Allocates a new directory entry for the node node with a name of name. 244 * The new directory entry is returned in *de. 245 * 246 * The link count of node is increased by one to reflect the new object 247 * referencing it. 248 * 249 * Returns zero on success or an appropriate error code on failure. 250 */ 251 int 252 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 253 const char *name, uint16_t len, struct tmpfs_dirent **de) 254 { 255 struct tmpfs_dirent *nde; 256 257 nde = (struct tmpfs_dirent *)uma_zalloc( 258 tmp->tm_dirent_pool, M_WAITOK); 259 nde->td_name = malloc(len, M_TMPFSNAME, M_WAITOK); 260 nde->td_namelen = len; 261 memcpy(nde->td_name, name, len); 262 263 nde->td_node = node; 264 if (node != NULL) 265 node->tn_links++; 266 267 *de = nde; 268 269 return 0; 270 } 271 272 /* --------------------------------------------------------------------- */ 273 274 /* 275 * Frees a directory entry. It is the caller's responsibility to destroy 276 * the node referenced by it if needed. 277 * 278 * The link count of node is decreased by one to reflect the removal of an 279 * object that referenced it. This only happens if 'node_exists' is true; 280 * otherwise the function will not access the node referred to by the 281 * directory entry, as it may already have been released from the outside. 282 */ 283 void 284 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de, 285 boolean_t node_exists) 286 { 287 if (node_exists) { 288 struct tmpfs_node *node; 289 290 node = de->td_node; 291 if (node != NULL) { 292 MPASS(node->tn_links > 0); 293 node->tn_links--; 294 } 295 } 296 297 free(de->td_name, M_TMPFSNAME); 298 uma_zfree(tmp->tm_dirent_pool, de); 299 } 300 301 /* --------------------------------------------------------------------- */ 302 303 /* 304 * Allocates a new vnode for the node node or returns a new reference to 305 * an existing one if the node had already a vnode referencing it. The 306 * resulting locked vnode is returned in *vpp. 307 * 308 * Returns zero on success or an appropriate error code on failure. 309 */ 310 int 311 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag, 312 struct vnode **vpp) 313 { 314 int error = 0; 315 struct vnode *vp; 316 317 loop: 318 TMPFS_NODE_LOCK(node); 319 if ((vp = node->tn_vnode) != NULL) { 320 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0); 321 VI_LOCK(vp); 322 TMPFS_NODE_UNLOCK(node); 323 vholdl(vp); 324 (void) vget(vp, lkflag | LK_INTERLOCK | LK_RETRY, curthread); 325 vdrop(vp); 326 327 /* 328 * Make sure the vnode is still there after 329 * getting the interlock to avoid racing a free. 330 */ 331 if (node->tn_vnode == NULL || node->tn_vnode != vp) { 332 vput(vp); 333 goto loop; 334 } 335 336 goto out; 337 } 338 339 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) || 340 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) { 341 TMPFS_NODE_UNLOCK(node); 342 error = ENOENT; 343 vp = NULL; 344 goto out; 345 } 346 347 /* 348 * otherwise lock the vp list while we call getnewvnode 349 * since that can block. 350 */ 351 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) { 352 node->tn_vpstate |= TMPFS_VNODE_WANT; 353 error = msleep((caddr_t) &node->tn_vpstate, 354 TMPFS_NODE_MTX(node), PDROP | PCATCH, 355 "tmpfs_alloc_vp", 0); 356 if (error) 357 return error; 358 359 goto loop; 360 } else 361 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING; 362 363 TMPFS_NODE_UNLOCK(node); 364 365 /* Get a new vnode and associate it with our node. */ 366 error = getnewvnode("tmpfs", mp, &tmpfs_vnodeop_entries, &vp); 367 if (error != 0) 368 goto unlock; 369 MPASS(vp != NULL); 370 371 (void) vn_lock(vp, lkflag | LK_RETRY); 372 373 vp->v_data = node; 374 vp->v_type = node->tn_type; 375 376 /* Type-specific initialization. */ 377 switch (node->tn_type) { 378 case VBLK: 379 /* FALLTHROUGH */ 380 case VCHR: 381 /* FALLTHROUGH */ 382 case VLNK: 383 /* FALLTHROUGH */ 384 case VREG: 385 /* FALLTHROUGH */ 386 case VSOCK: 387 break; 388 case VFIFO: 389 vp->v_op = &tmpfs_fifoop_entries; 390 break; 391 case VDIR: 392 MPASS(node->tn_dir.tn_parent != NULL); 393 if (node->tn_dir.tn_parent == node) 394 vp->v_vflag |= VV_ROOT; 395 break; 396 397 default: 398 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 399 } 400 401 vnode_pager_setsize(vp, node->tn_size); 402 error = insmntque(vp, mp); 403 if (error) 404 vp = NULL; 405 406 unlock: 407 TMPFS_NODE_LOCK(node); 408 409 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING); 410 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING; 411 node->tn_vnode = vp; 412 413 if (node->tn_vpstate & TMPFS_VNODE_WANT) { 414 node->tn_vpstate &= ~TMPFS_VNODE_WANT; 415 TMPFS_NODE_UNLOCK(node); 416 wakeup((caddr_t) &node->tn_vpstate); 417 } else 418 TMPFS_NODE_UNLOCK(node); 419 420 out: 421 *vpp = vp; 422 423 MPASS(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 424 #ifdef INVARIANTS 425 TMPFS_NODE_LOCK(node); 426 MPASS(*vpp == node->tn_vnode); 427 TMPFS_NODE_UNLOCK(node); 428 #endif 429 430 return error; 431 } 432 433 /* --------------------------------------------------------------------- */ 434 435 /* 436 * Destroys the association between the vnode vp and the node it 437 * references. 438 */ 439 void 440 tmpfs_free_vp(struct vnode *vp) 441 { 442 struct tmpfs_node *node; 443 444 node = VP_TO_TMPFS_NODE(vp); 445 446 mtx_assert(TMPFS_NODE_MTX(node), MA_OWNED); 447 node->tn_vnode = NULL; 448 vp->v_data = NULL; 449 } 450 451 /* --------------------------------------------------------------------- */ 452 453 /* 454 * Allocates a new file of type 'type' and adds it to the parent directory 455 * 'dvp'; this addition is done using the component name given in 'cnp'. 456 * The ownership of the new file is automatically assigned based on the 457 * credentials of the caller (through 'cnp'), the group is set based on 458 * the parent directory and the mode is determined from the 'vap' argument. 459 * If successful, *vpp holds a vnode to the newly created file and zero 460 * is returned. Otherwise *vpp is NULL and the function returns an 461 * appropriate error code. 462 */ 463 int 464 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 465 struct componentname *cnp, char *target) 466 { 467 int error; 468 struct tmpfs_dirent *de; 469 struct tmpfs_mount *tmp; 470 struct tmpfs_node *dnode; 471 struct tmpfs_node *node; 472 struct tmpfs_node *parent; 473 474 MPASS(VOP_ISLOCKED(dvp)); 475 MPASS(cnp->cn_flags & HASBUF); 476 477 tmp = VFS_TO_TMPFS(dvp->v_mount); 478 dnode = VP_TO_TMPFS_DIR(dvp); 479 *vpp = NULL; 480 481 /* If the entry we are creating is a directory, we cannot overflow 482 * the number of links of its parent, because it will get a new 483 * link. */ 484 if (vap->va_type == VDIR) { 485 /* Ensure that we do not overflow the maximum number of links 486 * imposed by the system. */ 487 MPASS(dnode->tn_links <= LINK_MAX); 488 if (dnode->tn_links == LINK_MAX) { 489 error = EMLINK; 490 goto out; 491 } 492 493 parent = dnode; 494 MPASS(parent != NULL); 495 } else 496 parent = NULL; 497 498 /* Allocate a node that represents the new file. */ 499 error = tmpfs_alloc_node(tmp, vap->va_type, cnp->cn_cred->cr_uid, 500 dnode->tn_gid, vap->va_mode, parent, target, vap->va_rdev, &node); 501 if (error != 0) 502 goto out; 503 504 /* Allocate a directory entry that points to the new file. */ 505 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen, 506 &de); 507 if (error != 0) { 508 tmpfs_free_node(tmp, node); 509 goto out; 510 } 511 512 /* Allocate a vnode for the new file. */ 513 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp); 514 if (error != 0) { 515 tmpfs_free_dirent(tmp, de, TRUE); 516 tmpfs_free_node(tmp, node); 517 goto out; 518 } 519 520 /* Now that all required items are allocated, we can proceed to 521 * insert the new node into the directory, an operation that 522 * cannot fail. */ 523 if (cnp->cn_flags & ISWHITEOUT) 524 tmpfs_dir_whiteout_remove(dvp, cnp); 525 tmpfs_dir_attach(dvp, de); 526 527 out: 528 529 return error; 530 } 531 532 /* --------------------------------------------------------------------- */ 533 534 /* 535 * Attaches the directory entry de to the directory represented by vp. 536 * Note that this does not change the link count of the node pointed by 537 * the directory entry, as this is done by tmpfs_alloc_dirent. 538 */ 539 void 540 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de) 541 { 542 struct tmpfs_node *dnode; 543 544 ASSERT_VOP_ELOCKED(vp, __func__); 545 dnode = VP_TO_TMPFS_DIR(vp); 546 TAILQ_INSERT_TAIL(&dnode->tn_dir.tn_dirhead, de, td_entries); 547 dnode->tn_size += sizeof(struct tmpfs_dirent); 548 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 549 TMPFS_NODE_MODIFIED; 550 } 551 552 /* --------------------------------------------------------------------- */ 553 554 /* 555 * Detaches the directory entry de from the directory represented by vp. 556 * Note that this does not change the link count of the node pointed by 557 * the directory entry, as this is done by tmpfs_free_dirent. 558 */ 559 void 560 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de) 561 { 562 struct tmpfs_node *dnode; 563 564 ASSERT_VOP_ELOCKED(vp, __func__); 565 dnode = VP_TO_TMPFS_DIR(vp); 566 567 if (dnode->tn_dir.tn_readdir_lastp == de) { 568 dnode->tn_dir.tn_readdir_lastn = 0; 569 dnode->tn_dir.tn_readdir_lastp = NULL; 570 } 571 572 TAILQ_REMOVE(&dnode->tn_dir.tn_dirhead, de, td_entries); 573 dnode->tn_size -= sizeof(struct tmpfs_dirent); 574 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 575 TMPFS_NODE_MODIFIED; 576 } 577 578 /* --------------------------------------------------------------------- */ 579 580 /* 581 * Looks for a directory entry in the directory represented by node. 582 * 'cnp' describes the name of the entry to look for. Note that the . 583 * and .. components are not allowed as they do not physically exist 584 * within directories. 585 * 586 * Returns a pointer to the entry when found, otherwise NULL. 587 */ 588 struct tmpfs_dirent * 589 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 590 struct componentname *cnp) 591 { 592 boolean_t found; 593 struct tmpfs_dirent *de; 594 595 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.')); 596 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' && 597 cnp->cn_nameptr[1] == '.'))); 598 TMPFS_VALIDATE_DIR(node); 599 600 found = 0; 601 TAILQ_FOREACH(de, &node->tn_dir.tn_dirhead, td_entries) { 602 if (f != NULL && de->td_node != f) 603 continue; 604 MPASS(cnp->cn_namelen < 0xffff); 605 if (de->td_namelen == (uint16_t)cnp->cn_namelen && 606 bcmp(de->td_name, cnp->cn_nameptr, de->td_namelen) == 0) { 607 found = 1; 608 break; 609 } 610 } 611 node->tn_status |= TMPFS_NODE_ACCESSED; 612 613 return found ? de : NULL; 614 } 615 616 /* --------------------------------------------------------------------- */ 617 618 /* 619 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 620 * directory and returns it in the uio space. The function returns 0 621 * on success, -1 if there was not enough space in the uio structure to 622 * hold the directory entry or an appropriate error code if another 623 * error happens. 624 */ 625 int 626 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 627 { 628 int error; 629 struct dirent dent; 630 631 TMPFS_VALIDATE_DIR(node); 632 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 633 634 dent.d_fileno = node->tn_id; 635 dent.d_type = DT_DIR; 636 dent.d_namlen = 1; 637 dent.d_name[0] = '.'; 638 dent.d_name[1] = '\0'; 639 dent.d_reclen = GENERIC_DIRSIZ(&dent); 640 641 if (dent.d_reclen > uio->uio_resid) 642 error = -1; 643 else { 644 error = uiomove(&dent, dent.d_reclen, uio); 645 if (error == 0) 646 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 647 } 648 649 node->tn_status |= TMPFS_NODE_ACCESSED; 650 651 return error; 652 } 653 654 /* --------------------------------------------------------------------- */ 655 656 /* 657 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 658 * directory and returns it in the uio space. The function returns 0 659 * on success, -1 if there was not enough space in the uio structure to 660 * hold the directory entry or an appropriate error code if another 661 * error happens. 662 */ 663 int 664 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio) 665 { 666 int error; 667 struct dirent dent; 668 669 TMPFS_VALIDATE_DIR(node); 670 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 671 672 /* 673 * Return ENOENT if the current node is already removed. 674 */ 675 TMPFS_ASSERT_LOCKED(node); 676 if (node->tn_dir.tn_parent == NULL) { 677 return (ENOENT); 678 } 679 680 TMPFS_NODE_LOCK(node->tn_dir.tn_parent); 681 dent.d_fileno = node->tn_dir.tn_parent->tn_id; 682 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent); 683 684 dent.d_type = DT_DIR; 685 dent.d_namlen = 2; 686 dent.d_name[0] = '.'; 687 dent.d_name[1] = '.'; 688 dent.d_name[2] = '\0'; 689 dent.d_reclen = GENERIC_DIRSIZ(&dent); 690 691 if (dent.d_reclen > uio->uio_resid) 692 error = -1; 693 else { 694 error = uiomove(&dent, dent.d_reclen, uio); 695 if (error == 0) { 696 struct tmpfs_dirent *de; 697 698 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 699 if (de == NULL) 700 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 701 else 702 uio->uio_offset = tmpfs_dircookie(de); 703 } 704 } 705 706 node->tn_status |= TMPFS_NODE_ACCESSED; 707 708 return error; 709 } 710 711 /* --------------------------------------------------------------------- */ 712 713 /* 714 * Lookup a directory entry by its associated cookie. 715 */ 716 struct tmpfs_dirent * 717 tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie) 718 { 719 struct tmpfs_dirent *de; 720 721 if (cookie == node->tn_dir.tn_readdir_lastn && 722 node->tn_dir.tn_readdir_lastp != NULL) { 723 return node->tn_dir.tn_readdir_lastp; 724 } 725 726 TAILQ_FOREACH(de, &node->tn_dir.tn_dirhead, td_entries) { 727 if (tmpfs_dircookie(de) == cookie) { 728 break; 729 } 730 } 731 732 return de; 733 } 734 735 /* --------------------------------------------------------------------- */ 736 737 /* 738 * Helper function for tmpfs_readdir. Returns as much directory entries 739 * as can fit in the uio space. The read starts at uio->uio_offset. 740 * The function returns 0 on success, -1 if there was not enough space 741 * in the uio structure to hold the directory entry or an appropriate 742 * error code if another error happens. 743 */ 744 int 745 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp) 746 { 747 int error; 748 off_t startcookie; 749 struct tmpfs_dirent *de; 750 751 TMPFS_VALIDATE_DIR(node); 752 753 /* Locate the first directory entry we have to return. We have cached 754 * the last readdir in the node, so use those values if appropriate. 755 * Otherwise do a linear scan to find the requested entry. */ 756 startcookie = uio->uio_offset; 757 MPASS(startcookie != TMPFS_DIRCOOKIE_DOT); 758 MPASS(startcookie != TMPFS_DIRCOOKIE_DOTDOT); 759 if (startcookie == TMPFS_DIRCOOKIE_EOF) { 760 return 0; 761 } else { 762 de = tmpfs_dir_lookupbycookie(node, startcookie); 763 } 764 if (de == NULL) { 765 return EINVAL; 766 } 767 768 /* Read as much entries as possible; i.e., until we reach the end of 769 * the directory or we exhaust uio space. */ 770 do { 771 struct dirent d; 772 773 /* Create a dirent structure representing the current 774 * tmpfs_node and fill it. */ 775 if (de->td_node == NULL) { 776 d.d_fileno = 1; 777 d.d_type = DT_WHT; 778 } else { 779 d.d_fileno = de->td_node->tn_id; 780 switch (de->td_node->tn_type) { 781 case VBLK: 782 d.d_type = DT_BLK; 783 break; 784 785 case VCHR: 786 d.d_type = DT_CHR; 787 break; 788 789 case VDIR: 790 d.d_type = DT_DIR; 791 break; 792 793 case VFIFO: 794 d.d_type = DT_FIFO; 795 break; 796 797 case VLNK: 798 d.d_type = DT_LNK; 799 break; 800 801 case VREG: 802 d.d_type = DT_REG; 803 break; 804 805 case VSOCK: 806 d.d_type = DT_SOCK; 807 break; 808 809 default: 810 panic("tmpfs_dir_getdents: type %p %d", 811 de->td_node, (int)de->td_node->tn_type); 812 } 813 } 814 d.d_namlen = de->td_namelen; 815 MPASS(de->td_namelen < sizeof(d.d_name)); 816 (void)memcpy(d.d_name, de->td_name, de->td_namelen); 817 d.d_name[de->td_namelen] = '\0'; 818 d.d_reclen = GENERIC_DIRSIZ(&d); 819 820 /* Stop reading if the directory entry we are treating is 821 * bigger than the amount of data that can be returned. */ 822 if (d.d_reclen > uio->uio_resid) { 823 error = -1; 824 break; 825 } 826 827 /* Copy the new dirent structure into the output buffer and 828 * advance pointers. */ 829 error = uiomove(&d, d.d_reclen, uio); 830 if (error == 0) { 831 (*cntp)++; 832 de = TAILQ_NEXT(de, td_entries); 833 } 834 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 835 836 /* Update the offset and cache. */ 837 if (de == NULL) { 838 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 839 node->tn_dir.tn_readdir_lastn = 0; 840 node->tn_dir.tn_readdir_lastp = NULL; 841 } else { 842 node->tn_dir.tn_readdir_lastn = uio->uio_offset = tmpfs_dircookie(de); 843 node->tn_dir.tn_readdir_lastp = de; 844 } 845 846 node->tn_status |= TMPFS_NODE_ACCESSED; 847 return error; 848 } 849 850 int 851 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp) 852 { 853 struct tmpfs_dirent *de; 854 int error; 855 856 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL, 857 cnp->cn_nameptr, cnp->cn_namelen, &de); 858 if (error != 0) 859 return (error); 860 tmpfs_dir_attach(dvp, de); 861 return (0); 862 } 863 864 void 865 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp) 866 { 867 struct tmpfs_dirent *de; 868 869 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 870 MPASS(de != NULL && de->td_node == NULL); 871 tmpfs_dir_detach(dvp, de); 872 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de, TRUE); 873 } 874 875 /* --------------------------------------------------------------------- */ 876 877 /* 878 * Resizes the aobj associated with the regular file pointed to by 'vp' to the 879 * size 'newsize'. 'vp' must point to a vnode that represents a regular file. 880 * 'newsize' must be positive. 881 * 882 * Returns zero on success or an appropriate error code on failure. 883 */ 884 int 885 tmpfs_reg_resize(struct vnode *vp, off_t newsize) 886 { 887 struct tmpfs_mount *tmp; 888 struct tmpfs_node *node; 889 vm_object_t uobj; 890 vm_page_t m, ma[1]; 891 vm_pindex_t idx, newpages, oldpages; 892 off_t oldsize; 893 int base, rv; 894 895 MPASS(vp->v_type == VREG); 896 MPASS(newsize >= 0); 897 898 node = VP_TO_TMPFS_NODE(vp); 899 uobj = node->tn_reg.tn_aobj; 900 tmp = VFS_TO_TMPFS(vp->v_mount); 901 902 /* 903 * Convert the old and new sizes to the number of pages needed to 904 * store them. It may happen that we do not need to do anything 905 * because the last allocated page can accommodate the change on 906 * its own. 907 */ 908 oldsize = node->tn_size; 909 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK); 910 MPASS(oldpages == uobj->size); 911 newpages = OFF_TO_IDX(newsize + PAGE_MASK); 912 if (newpages > oldpages && 913 newpages - oldpages > TMPFS_PAGES_AVAIL(tmp)) 914 return (ENOSPC); 915 916 VM_OBJECT_LOCK(uobj); 917 if (newsize < oldsize) { 918 /* 919 * Zero the truncated part of the last page. 920 */ 921 base = newsize & PAGE_MASK; 922 if (base != 0) { 923 idx = OFF_TO_IDX(newsize); 924 retry: 925 m = vm_page_lookup(uobj, idx); 926 if (m != NULL) { 927 if ((m->oflags & VPO_BUSY) != 0 || 928 m->busy != 0) { 929 vm_page_sleep(m, "tmfssz"); 930 goto retry; 931 } 932 MPASS(m->valid == VM_PAGE_BITS_ALL); 933 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) { 934 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL); 935 if (m == NULL) { 936 VM_OBJECT_UNLOCK(uobj); 937 VM_WAIT; 938 VM_OBJECT_LOCK(uobj); 939 goto retry; 940 } else if (m->valid != VM_PAGE_BITS_ALL) { 941 ma[0] = m; 942 rv = vm_pager_get_pages(uobj, ma, 1, 0); 943 m = vm_page_lookup(uobj, idx); 944 } else 945 /* A cached page was reactivated. */ 946 rv = VM_PAGER_OK; 947 vm_page_lock(m); 948 if (rv == VM_PAGER_OK) { 949 vm_page_deactivate(m); 950 vm_page_unlock(m); 951 vm_page_wakeup(m); 952 } else { 953 vm_page_free(m); 954 vm_page_unlock(m); 955 VM_OBJECT_UNLOCK(uobj); 956 return (EIO); 957 } 958 } 959 if (m != NULL) { 960 pmap_zero_page_area(m, base, PAGE_SIZE - base); 961 vm_page_dirty(m); 962 vm_pager_page_unswapped(m); 963 } 964 } 965 966 /* 967 * Release any swap space and free any whole pages. 968 */ 969 if (newpages < oldpages) { 970 swap_pager_freespace(uobj, newpages, oldpages - 971 newpages); 972 vm_object_page_remove(uobj, newpages, 0, 0); 973 } 974 } 975 uobj->size = newpages; 976 VM_OBJECT_UNLOCK(uobj); 977 978 TMPFS_LOCK(tmp); 979 tmp->tm_pages_used += (newpages - oldpages); 980 TMPFS_UNLOCK(tmp); 981 982 node->tn_size = newsize; 983 vnode_pager_setsize(vp, newsize); 984 return (0); 985 } 986 987 /* --------------------------------------------------------------------- */ 988 989 /* 990 * Change flags of the given vnode. 991 * Caller should execute tmpfs_update on vp after a successful execution. 992 * The vnode must be locked on entry and remain locked on exit. 993 */ 994 int 995 tmpfs_chflags(struct vnode *vp, int flags, struct ucred *cred, struct thread *p) 996 { 997 int error; 998 struct tmpfs_node *node; 999 1000 MPASS(VOP_ISLOCKED(vp)); 1001 1002 node = VP_TO_TMPFS_NODE(vp); 1003 1004 /* Disallow this operation if the file system is mounted read-only. */ 1005 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1006 return EROFS; 1007 1008 /* 1009 * Callers may only modify the file flags on objects they 1010 * have VADMIN rights for. 1011 */ 1012 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1013 return (error); 1014 /* 1015 * Unprivileged processes are not permitted to unset system 1016 * flags, or modify flags if any system flags are set. 1017 */ 1018 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 1019 if (node->tn_flags 1020 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 1021 error = securelevel_gt(cred, 0); 1022 if (error) 1023 return (error); 1024 } 1025 /* Snapshot flag cannot be set or cleared */ 1026 if (((flags & SF_SNAPSHOT) != 0 && 1027 (node->tn_flags & SF_SNAPSHOT) == 0) || 1028 ((flags & SF_SNAPSHOT) == 0 && 1029 (node->tn_flags & SF_SNAPSHOT) != 0)) 1030 return (EPERM); 1031 node->tn_flags = flags; 1032 } else { 1033 if (node->tn_flags 1034 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 1035 (flags & UF_SETTABLE) != flags) 1036 return (EPERM); 1037 node->tn_flags &= SF_SETTABLE; 1038 node->tn_flags |= (flags & UF_SETTABLE); 1039 } 1040 node->tn_status |= TMPFS_NODE_CHANGED; 1041 1042 MPASS(VOP_ISLOCKED(vp)); 1043 1044 return 0; 1045 } 1046 1047 /* --------------------------------------------------------------------- */ 1048 1049 /* 1050 * Change access mode on the given vnode. 1051 * Caller should execute tmpfs_update on vp after a successful execution. 1052 * The vnode must be locked on entry and remain locked on exit. 1053 */ 1054 int 1055 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p) 1056 { 1057 int error; 1058 struct tmpfs_node *node; 1059 1060 MPASS(VOP_ISLOCKED(vp)); 1061 1062 node = VP_TO_TMPFS_NODE(vp); 1063 1064 /* Disallow this operation if the file system is mounted read-only. */ 1065 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1066 return EROFS; 1067 1068 /* Immutable or append-only files cannot be modified, either. */ 1069 if (node->tn_flags & (IMMUTABLE | APPEND)) 1070 return EPERM; 1071 1072 /* 1073 * To modify the permissions on a file, must possess VADMIN 1074 * for that file. 1075 */ 1076 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1077 return (error); 1078 1079 /* 1080 * Privileged processes may set the sticky bit on non-directories, 1081 * as well as set the setgid bit on a file with a group that the 1082 * process is not a member of. 1083 */ 1084 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 1085 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 1086 return (EFTYPE); 1087 } 1088 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) { 1089 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 1090 if (error) 1091 return (error); 1092 } 1093 1094 1095 node->tn_mode &= ~ALLPERMS; 1096 node->tn_mode |= mode & ALLPERMS; 1097 1098 node->tn_status |= TMPFS_NODE_CHANGED; 1099 1100 MPASS(VOP_ISLOCKED(vp)); 1101 1102 return 0; 1103 } 1104 1105 /* --------------------------------------------------------------------- */ 1106 1107 /* 1108 * Change ownership of the given vnode. At least one of uid or gid must 1109 * be different than VNOVAL. If one is set to that value, the attribute 1110 * is unchanged. 1111 * Caller should execute tmpfs_update on vp after a successful execution. 1112 * The vnode must be locked on entry and remain locked on exit. 1113 */ 1114 int 1115 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 1116 struct thread *p) 1117 { 1118 int error; 1119 struct tmpfs_node *node; 1120 uid_t ouid; 1121 gid_t ogid; 1122 1123 MPASS(VOP_ISLOCKED(vp)); 1124 1125 node = VP_TO_TMPFS_NODE(vp); 1126 1127 /* Assign default values if they are unknown. */ 1128 MPASS(uid != VNOVAL || gid != VNOVAL); 1129 if (uid == VNOVAL) 1130 uid = node->tn_uid; 1131 if (gid == VNOVAL) 1132 gid = node->tn_gid; 1133 MPASS(uid != VNOVAL && gid != VNOVAL); 1134 1135 /* Disallow this operation if the file system is mounted read-only. */ 1136 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1137 return EROFS; 1138 1139 /* Immutable or append-only files cannot be modified, either. */ 1140 if (node->tn_flags & (IMMUTABLE | APPEND)) 1141 return EPERM; 1142 1143 /* 1144 * To modify the ownership of a file, must possess VADMIN for that 1145 * file. 1146 */ 1147 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1148 return (error); 1149 1150 /* 1151 * To change the owner of a file, or change the group of a file to a 1152 * group of which we are not a member, the caller must have 1153 * privilege. 1154 */ 1155 if ((uid != node->tn_uid || 1156 (gid != node->tn_gid && !groupmember(gid, cred))) && 1157 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 1158 return (error); 1159 1160 ogid = node->tn_gid; 1161 ouid = node->tn_uid; 1162 1163 node->tn_uid = uid; 1164 node->tn_gid = gid; 1165 1166 node->tn_status |= TMPFS_NODE_CHANGED; 1167 1168 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) { 1169 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) 1170 node->tn_mode &= ~(S_ISUID | S_ISGID); 1171 } 1172 1173 MPASS(VOP_ISLOCKED(vp)); 1174 1175 return 0; 1176 } 1177 1178 /* --------------------------------------------------------------------- */ 1179 1180 /* 1181 * Change size of the given vnode. 1182 * Caller should execute tmpfs_update on vp after a successful execution. 1183 * The vnode must be locked on entry and remain locked on exit. 1184 */ 1185 int 1186 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred, 1187 struct thread *p) 1188 { 1189 int error; 1190 struct tmpfs_node *node; 1191 1192 MPASS(VOP_ISLOCKED(vp)); 1193 1194 node = VP_TO_TMPFS_NODE(vp); 1195 1196 /* Decide whether this is a valid operation based on the file type. */ 1197 error = 0; 1198 switch (vp->v_type) { 1199 case VDIR: 1200 return EISDIR; 1201 1202 case VREG: 1203 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1204 return EROFS; 1205 break; 1206 1207 case VBLK: 1208 /* FALLTHROUGH */ 1209 case VCHR: 1210 /* FALLTHROUGH */ 1211 case VFIFO: 1212 /* Allow modifications of special files even if in the file 1213 * system is mounted read-only (we are not modifying the 1214 * files themselves, but the objects they represent). */ 1215 return 0; 1216 1217 default: 1218 /* Anything else is unsupported. */ 1219 return EOPNOTSUPP; 1220 } 1221 1222 /* Immutable or append-only files cannot be modified, either. */ 1223 if (node->tn_flags & (IMMUTABLE | APPEND)) 1224 return EPERM; 1225 1226 error = tmpfs_truncate(vp, size); 1227 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1228 * for us, as will update tn_status; no need to do that here. */ 1229 1230 MPASS(VOP_ISLOCKED(vp)); 1231 1232 return error; 1233 } 1234 1235 /* --------------------------------------------------------------------- */ 1236 1237 /* 1238 * Change access and modification times of the given vnode. 1239 * Caller should execute tmpfs_update on vp after a successful execution. 1240 * The vnode must be locked on entry and remain locked on exit. 1241 */ 1242 int 1243 tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime, 1244 struct timespec *birthtime, int vaflags, struct ucred *cred, struct thread *l) 1245 { 1246 int error; 1247 struct tmpfs_node *node; 1248 1249 MPASS(VOP_ISLOCKED(vp)); 1250 1251 node = VP_TO_TMPFS_NODE(vp); 1252 1253 /* Disallow this operation if the file system is mounted read-only. */ 1254 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1255 return EROFS; 1256 1257 /* Immutable or append-only files cannot be modified, either. */ 1258 if (node->tn_flags & (IMMUTABLE | APPEND)) 1259 return EPERM; 1260 1261 /* Determine if the user have proper privilege to update time. */ 1262 if (vaflags & VA_UTIMES_NULL) { 1263 error = VOP_ACCESS(vp, VADMIN, cred, l); 1264 if (error) 1265 error = VOP_ACCESS(vp, VWRITE, cred, l); 1266 } else 1267 error = VOP_ACCESS(vp, VADMIN, cred, l); 1268 if (error) 1269 return (error); 1270 1271 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL) 1272 node->tn_status |= TMPFS_NODE_ACCESSED; 1273 1274 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL) 1275 node->tn_status |= TMPFS_NODE_MODIFIED; 1276 1277 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL) 1278 node->tn_status |= TMPFS_NODE_MODIFIED; 1279 1280 tmpfs_itimes(vp, atime, mtime); 1281 1282 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL) 1283 node->tn_birthtime = *birthtime; 1284 MPASS(VOP_ISLOCKED(vp)); 1285 1286 return 0; 1287 } 1288 1289 /* --------------------------------------------------------------------- */ 1290 /* Sync timestamps */ 1291 void 1292 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1293 const struct timespec *mod) 1294 { 1295 struct tmpfs_node *node; 1296 struct timespec now; 1297 1298 node = VP_TO_TMPFS_NODE(vp); 1299 1300 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1301 TMPFS_NODE_CHANGED)) == 0) 1302 return; 1303 1304 vfs_timestamp(&now); 1305 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1306 if (acc == NULL) 1307 acc = &now; 1308 node->tn_atime = *acc; 1309 } 1310 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1311 if (mod == NULL) 1312 mod = &now; 1313 node->tn_mtime = *mod; 1314 } 1315 if (node->tn_status & TMPFS_NODE_CHANGED) { 1316 node->tn_ctime = now; 1317 } 1318 node->tn_status &= 1319 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED); 1320 } 1321 1322 /* --------------------------------------------------------------------- */ 1323 1324 void 1325 tmpfs_update(struct vnode *vp) 1326 { 1327 1328 tmpfs_itimes(vp, NULL, NULL); 1329 } 1330 1331 /* --------------------------------------------------------------------- */ 1332 1333 int 1334 tmpfs_truncate(struct vnode *vp, off_t length) 1335 { 1336 int error; 1337 struct tmpfs_node *node; 1338 1339 node = VP_TO_TMPFS_NODE(vp); 1340 1341 if (length < 0) { 1342 error = EINVAL; 1343 goto out; 1344 } 1345 1346 if (node->tn_size == length) { 1347 error = 0; 1348 goto out; 1349 } 1350 1351 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1352 return (EFBIG); 1353 1354 error = tmpfs_reg_resize(vp, length); 1355 if (error == 0) { 1356 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1357 } 1358 1359 out: 1360 tmpfs_update(vp); 1361 1362 return error; 1363 } 1364