tmpfs_subr.c revision 232959
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: head/sys/fs/tmpfs/tmpfs_subr.c 232959 2012-03-14 08:29:21Z gleb $"); 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 */ 83int 84tmpfs_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 */ 184void 185tmpfs_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 */ 251int 252tmpfs_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 */ 283void 284tmpfs_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 */ 310int 311tmpfs_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 317loop: 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 error = vget(vp, lkflag | LK_INTERLOCK, curthread); 324 if (error != 0) { 325 vp = NULL; 326 goto out; 327 } 328 329 /* 330 * Make sure the vnode is still there after 331 * getting the interlock to avoid racing a free. 332 */ 333 if (node->tn_vnode == NULL || node->tn_vnode != vp) { 334 vput(vp); 335 goto loop; 336 } 337 338 goto out; 339 } 340 341 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) || 342 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) { 343 TMPFS_NODE_UNLOCK(node); 344 error = ENOENT; 345 vp = NULL; 346 goto out; 347 } 348 349 /* 350 * otherwise lock the vp list while we call getnewvnode 351 * since that can block. 352 */ 353 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) { 354 node->tn_vpstate |= TMPFS_VNODE_WANT; 355 error = msleep((caddr_t) &node->tn_vpstate, 356 TMPFS_NODE_MTX(node), PDROP | PCATCH, 357 "tmpfs_alloc_vp", 0); 358 if (error) 359 return error; 360 361 goto loop; 362 } else 363 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING; 364 365 TMPFS_NODE_UNLOCK(node); 366 367 /* Get a new vnode and associate it with our node. */ 368 error = getnewvnode("tmpfs", mp, &tmpfs_vnodeop_entries, &vp); 369 if (error != 0) 370 goto unlock; 371 MPASS(vp != NULL); 372 373 (void) vn_lock(vp, lkflag | LK_RETRY); 374 375 vp->v_data = node; 376 vp->v_type = node->tn_type; 377 378 /* Type-specific initialization. */ 379 switch (node->tn_type) { 380 case VBLK: 381 /* FALLTHROUGH */ 382 case VCHR: 383 /* FALLTHROUGH */ 384 case VLNK: 385 /* FALLTHROUGH */ 386 case VREG: 387 /* FALLTHROUGH */ 388 case VSOCK: 389 break; 390 case VFIFO: 391 vp->v_op = &tmpfs_fifoop_entries; 392 break; 393 case VDIR: 394 MPASS(node->tn_dir.tn_parent != NULL); 395 if (node->tn_dir.tn_parent == node) 396 vp->v_vflag |= VV_ROOT; 397 break; 398 399 default: 400 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 401 } 402 403 vnode_pager_setsize(vp, node->tn_size); 404 error = insmntque(vp, mp); 405 if (error) 406 vp = NULL; 407 408unlock: 409 TMPFS_NODE_LOCK(node); 410 411 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING); 412 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING; 413 node->tn_vnode = vp; 414 415 if (node->tn_vpstate & TMPFS_VNODE_WANT) { 416 node->tn_vpstate &= ~TMPFS_VNODE_WANT; 417 TMPFS_NODE_UNLOCK(node); 418 wakeup((caddr_t) &node->tn_vpstate); 419 } else 420 TMPFS_NODE_UNLOCK(node); 421 422out: 423 *vpp = vp; 424 425#ifdef INVARIANTS 426 if (error == 0) { 427 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp)); 428 TMPFS_NODE_LOCK(node); 429 MPASS(*vpp == node->tn_vnode); 430 TMPFS_NODE_UNLOCK(node); 431 } 432#endif 433 434 return error; 435} 436 437/* --------------------------------------------------------------------- */ 438 439/* 440 * Destroys the association between the vnode vp and the node it 441 * references. 442 */ 443void 444tmpfs_free_vp(struct vnode *vp) 445{ 446 struct tmpfs_node *node; 447 448 node = VP_TO_TMPFS_NODE(vp); 449 450 mtx_assert(TMPFS_NODE_MTX(node), MA_OWNED); 451 node->tn_vnode = NULL; 452 vp->v_data = NULL; 453} 454 455/* --------------------------------------------------------------------- */ 456 457/* 458 * Allocates a new file of type 'type' and adds it to the parent directory 459 * 'dvp'; this addition is done using the component name given in 'cnp'. 460 * The ownership of the new file is automatically assigned based on the 461 * credentials of the caller (through 'cnp'), the group is set based on 462 * the parent directory and the mode is determined from the 'vap' argument. 463 * If successful, *vpp holds a vnode to the newly created file and zero 464 * is returned. Otherwise *vpp is NULL and the function returns an 465 * appropriate error code. 466 */ 467int 468tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 469 struct componentname *cnp, char *target) 470{ 471 int error; 472 struct tmpfs_dirent *de; 473 struct tmpfs_mount *tmp; 474 struct tmpfs_node *dnode; 475 struct tmpfs_node *node; 476 struct tmpfs_node *parent; 477 478 MPASS(VOP_ISLOCKED(dvp)); 479 MPASS(cnp->cn_flags & HASBUF); 480 481 tmp = VFS_TO_TMPFS(dvp->v_mount); 482 dnode = VP_TO_TMPFS_DIR(dvp); 483 *vpp = NULL; 484 485 /* If the entry we are creating is a directory, we cannot overflow 486 * the number of links of its parent, because it will get a new 487 * link. */ 488 if (vap->va_type == VDIR) { 489 /* Ensure that we do not overflow the maximum number of links 490 * imposed by the system. */ 491 MPASS(dnode->tn_links <= LINK_MAX); 492 if (dnode->tn_links == LINK_MAX) { 493 error = EMLINK; 494 goto out; 495 } 496 497 parent = dnode; 498 MPASS(parent != NULL); 499 } else 500 parent = NULL; 501 502 /* Allocate a node that represents the new file. */ 503 error = tmpfs_alloc_node(tmp, vap->va_type, cnp->cn_cred->cr_uid, 504 dnode->tn_gid, vap->va_mode, parent, target, vap->va_rdev, &node); 505 if (error != 0) 506 goto out; 507 508 /* Allocate a directory entry that points to the new file. */ 509 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen, 510 &de); 511 if (error != 0) { 512 tmpfs_free_node(tmp, node); 513 goto out; 514 } 515 516 /* Allocate a vnode for the new file. */ 517 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp); 518 if (error != 0) { 519 tmpfs_free_dirent(tmp, de, TRUE); 520 tmpfs_free_node(tmp, node); 521 goto out; 522 } 523 524 /* Now that all required items are allocated, we can proceed to 525 * insert the new node into the directory, an operation that 526 * cannot fail. */ 527 if (cnp->cn_flags & ISWHITEOUT) 528 tmpfs_dir_whiteout_remove(dvp, cnp); 529 tmpfs_dir_attach(dvp, de); 530 531out: 532 533 return error; 534} 535 536/* --------------------------------------------------------------------- */ 537 538/* 539 * Attaches the directory entry de to the directory represented by vp. 540 * Note that this does not change the link count of the node pointed by 541 * the directory entry, as this is done by tmpfs_alloc_dirent. 542 */ 543void 544tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de) 545{ 546 struct tmpfs_node *dnode; 547 548 ASSERT_VOP_ELOCKED(vp, __func__); 549 dnode = VP_TO_TMPFS_DIR(vp); 550 TAILQ_INSERT_TAIL(&dnode->tn_dir.tn_dirhead, de, td_entries); 551 dnode->tn_size += sizeof(struct tmpfs_dirent); 552 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 553 TMPFS_NODE_MODIFIED; 554} 555 556/* --------------------------------------------------------------------- */ 557 558/* 559 * Detaches the directory entry de from the directory represented by vp. 560 * Note that this does not change the link count of the node pointed by 561 * the directory entry, as this is done by tmpfs_free_dirent. 562 */ 563void 564tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de) 565{ 566 struct tmpfs_node *dnode; 567 568 ASSERT_VOP_ELOCKED(vp, __func__); 569 dnode = VP_TO_TMPFS_DIR(vp); 570 571 if (dnode->tn_dir.tn_readdir_lastp == de) { 572 dnode->tn_dir.tn_readdir_lastn = 0; 573 dnode->tn_dir.tn_readdir_lastp = NULL; 574 } 575 576 TAILQ_REMOVE(&dnode->tn_dir.tn_dirhead, de, td_entries); 577 dnode->tn_size -= sizeof(struct tmpfs_dirent); 578 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 579 TMPFS_NODE_MODIFIED; 580} 581 582/* --------------------------------------------------------------------- */ 583 584/* 585 * Looks for a directory entry in the directory represented by node. 586 * 'cnp' describes the name of the entry to look for. Note that the . 587 * and .. components are not allowed as they do not physically exist 588 * within directories. 589 * 590 * Returns a pointer to the entry when found, otherwise NULL. 591 */ 592struct tmpfs_dirent * 593tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 594 struct componentname *cnp) 595{ 596 boolean_t found; 597 struct tmpfs_dirent *de; 598 599 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.')); 600 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' && 601 cnp->cn_nameptr[1] == '.'))); 602 TMPFS_VALIDATE_DIR(node); 603 604 found = 0; 605 TAILQ_FOREACH(de, &node->tn_dir.tn_dirhead, td_entries) { 606 if (f != NULL && de->td_node != f) 607 continue; 608 MPASS(cnp->cn_namelen < 0xffff); 609 if (de->td_namelen == (uint16_t)cnp->cn_namelen && 610 bcmp(de->td_name, cnp->cn_nameptr, de->td_namelen) == 0) { 611 found = 1; 612 break; 613 } 614 } 615 node->tn_status |= TMPFS_NODE_ACCESSED; 616 617 return found ? de : NULL; 618} 619 620/* --------------------------------------------------------------------- */ 621 622/* 623 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 624 * directory and returns it in the uio space. The function returns 0 625 * on success, -1 if there was not enough space in the uio structure to 626 * hold the directory entry or an appropriate error code if another 627 * error happens. 628 */ 629int 630tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 631{ 632 int error; 633 struct dirent dent; 634 635 TMPFS_VALIDATE_DIR(node); 636 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 637 638 dent.d_fileno = node->tn_id; 639 dent.d_type = DT_DIR; 640 dent.d_namlen = 1; 641 dent.d_name[0] = '.'; 642 dent.d_name[1] = '\0'; 643 dent.d_reclen = GENERIC_DIRSIZ(&dent); 644 645 if (dent.d_reclen > uio->uio_resid) 646 error = -1; 647 else { 648 error = uiomove(&dent, dent.d_reclen, uio); 649 if (error == 0) 650 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 651 } 652 653 node->tn_status |= TMPFS_NODE_ACCESSED; 654 655 return error; 656} 657 658/* --------------------------------------------------------------------- */ 659 660/* 661 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 662 * directory and returns it in the uio space. The function returns 0 663 * on success, -1 if there was not enough space in the uio structure to 664 * hold the directory entry or an appropriate error code if another 665 * error happens. 666 */ 667int 668tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio) 669{ 670 int error; 671 struct dirent dent; 672 673 TMPFS_VALIDATE_DIR(node); 674 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 675 676 /* 677 * Return ENOENT if the current node is already removed. 678 */ 679 TMPFS_ASSERT_LOCKED(node); 680 if (node->tn_dir.tn_parent == NULL) { 681 return (ENOENT); 682 } 683 684 TMPFS_NODE_LOCK(node->tn_dir.tn_parent); 685 dent.d_fileno = node->tn_dir.tn_parent->tn_id; 686 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent); 687 688 dent.d_type = DT_DIR; 689 dent.d_namlen = 2; 690 dent.d_name[0] = '.'; 691 dent.d_name[1] = '.'; 692 dent.d_name[2] = '\0'; 693 dent.d_reclen = GENERIC_DIRSIZ(&dent); 694 695 if (dent.d_reclen > uio->uio_resid) 696 error = -1; 697 else { 698 error = uiomove(&dent, dent.d_reclen, uio); 699 if (error == 0) { 700 struct tmpfs_dirent *de; 701 702 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 703 if (de == NULL) 704 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 705 else 706 uio->uio_offset = tmpfs_dircookie(de); 707 } 708 } 709 710 node->tn_status |= TMPFS_NODE_ACCESSED; 711 712 return error; 713} 714 715/* --------------------------------------------------------------------- */ 716 717/* 718 * Lookup a directory entry by its associated cookie. 719 */ 720struct tmpfs_dirent * 721tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie) 722{ 723 struct tmpfs_dirent *de; 724 725 if (cookie == node->tn_dir.tn_readdir_lastn && 726 node->tn_dir.tn_readdir_lastp != NULL) { 727 return node->tn_dir.tn_readdir_lastp; 728 } 729 730 TAILQ_FOREACH(de, &node->tn_dir.tn_dirhead, td_entries) { 731 if (tmpfs_dircookie(de) == cookie) { 732 break; 733 } 734 } 735 736 return de; 737} 738 739/* --------------------------------------------------------------------- */ 740 741/* 742 * Helper function for tmpfs_readdir. Returns as much directory entries 743 * as can fit in the uio space. The read starts at uio->uio_offset. 744 * The function returns 0 on success, -1 if there was not enough space 745 * in the uio structure to hold the directory entry or an appropriate 746 * error code if another error happens. 747 */ 748int 749tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp) 750{ 751 int error; 752 off_t startcookie; 753 struct tmpfs_dirent *de; 754 755 TMPFS_VALIDATE_DIR(node); 756 757 /* Locate the first directory entry we have to return. We have cached 758 * the last readdir in the node, so use those values if appropriate. 759 * Otherwise do a linear scan to find the requested entry. */ 760 startcookie = uio->uio_offset; 761 MPASS(startcookie != TMPFS_DIRCOOKIE_DOT); 762 MPASS(startcookie != TMPFS_DIRCOOKIE_DOTDOT); 763 if (startcookie == TMPFS_DIRCOOKIE_EOF) { 764 return 0; 765 } else { 766 de = tmpfs_dir_lookupbycookie(node, startcookie); 767 } 768 if (de == NULL) { 769 return EINVAL; 770 } 771 772 /* Read as much entries as possible; i.e., until we reach the end of 773 * the directory or we exhaust uio space. */ 774 do { 775 struct dirent d; 776 777 /* Create a dirent structure representing the current 778 * tmpfs_node and fill it. */ 779 if (de->td_node == NULL) { 780 d.d_fileno = 1; 781 d.d_type = DT_WHT; 782 } else { 783 d.d_fileno = de->td_node->tn_id; 784 switch (de->td_node->tn_type) { 785 case VBLK: 786 d.d_type = DT_BLK; 787 break; 788 789 case VCHR: 790 d.d_type = DT_CHR; 791 break; 792 793 case VDIR: 794 d.d_type = DT_DIR; 795 break; 796 797 case VFIFO: 798 d.d_type = DT_FIFO; 799 break; 800 801 case VLNK: 802 d.d_type = DT_LNK; 803 break; 804 805 case VREG: 806 d.d_type = DT_REG; 807 break; 808 809 case VSOCK: 810 d.d_type = DT_SOCK; 811 break; 812 813 default: 814 panic("tmpfs_dir_getdents: type %p %d", 815 de->td_node, (int)de->td_node->tn_type); 816 } 817 } 818 d.d_namlen = de->td_namelen; 819 MPASS(de->td_namelen < sizeof(d.d_name)); 820 (void)memcpy(d.d_name, de->td_name, de->td_namelen); 821 d.d_name[de->td_namelen] = '\0'; 822 d.d_reclen = GENERIC_DIRSIZ(&d); 823 824 /* Stop reading if the directory entry we are treating is 825 * bigger than the amount of data that can be returned. */ 826 if (d.d_reclen > uio->uio_resid) { 827 error = -1; 828 break; 829 } 830 831 /* Copy the new dirent structure into the output buffer and 832 * advance pointers. */ 833 error = uiomove(&d, d.d_reclen, uio); 834 if (error == 0) { 835 (*cntp)++; 836 de = TAILQ_NEXT(de, td_entries); 837 } 838 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 839 840 /* Update the offset and cache. */ 841 if (de == NULL) { 842 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 843 node->tn_dir.tn_readdir_lastn = 0; 844 node->tn_dir.tn_readdir_lastp = NULL; 845 } else { 846 node->tn_dir.tn_readdir_lastn = uio->uio_offset = tmpfs_dircookie(de); 847 node->tn_dir.tn_readdir_lastp = de; 848 } 849 850 node->tn_status |= TMPFS_NODE_ACCESSED; 851 return error; 852} 853 854int 855tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp) 856{ 857 struct tmpfs_dirent *de; 858 int error; 859 860 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL, 861 cnp->cn_nameptr, cnp->cn_namelen, &de); 862 if (error != 0) 863 return (error); 864 tmpfs_dir_attach(dvp, de); 865 return (0); 866} 867 868void 869tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp) 870{ 871 struct tmpfs_dirent *de; 872 873 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 874 MPASS(de != NULL && de->td_node == NULL); 875 tmpfs_dir_detach(dvp, de); 876 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de, TRUE); 877} 878 879/* --------------------------------------------------------------------- */ 880 881/* 882 * Resizes the aobj associated with the regular file pointed to by 'vp' to the 883 * size 'newsize'. 'vp' must point to a vnode that represents a regular file. 884 * 'newsize' must be positive. 885 * 886 * Returns zero on success or an appropriate error code on failure. 887 */ 888int 889tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr) 890{ 891 struct tmpfs_mount *tmp; 892 struct tmpfs_node *node; 893 vm_object_t uobj; 894 vm_page_t m, ma[1]; 895 vm_pindex_t idx, newpages, oldpages; 896 off_t oldsize; 897 int base, rv; 898 899 MPASS(vp->v_type == VREG); 900 MPASS(newsize >= 0); 901 902 node = VP_TO_TMPFS_NODE(vp); 903 uobj = node->tn_reg.tn_aobj; 904 tmp = VFS_TO_TMPFS(vp->v_mount); 905 906 /* 907 * Convert the old and new sizes to the number of pages needed to 908 * store them. It may happen that we do not need to do anything 909 * because the last allocated page can accommodate the change on 910 * its own. 911 */ 912 oldsize = node->tn_size; 913 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK); 914 MPASS(oldpages == uobj->size); 915 newpages = OFF_TO_IDX(newsize + PAGE_MASK); 916 if (newpages > oldpages && 917 newpages - oldpages > TMPFS_PAGES_AVAIL(tmp)) 918 return (ENOSPC); 919 920 VM_OBJECT_LOCK(uobj); 921 if (newsize < oldsize) { 922 /* 923 * Zero the truncated part of the last page. 924 */ 925 base = newsize & PAGE_MASK; 926 if (base != 0) { 927 idx = OFF_TO_IDX(newsize); 928retry: 929 m = vm_page_lookup(uobj, idx); 930 if (m != NULL) { 931 if ((m->oflags & VPO_BUSY) != 0 || 932 m->busy != 0) { 933 vm_page_sleep(m, "tmfssz"); 934 goto retry; 935 } 936 MPASS(m->valid == VM_PAGE_BITS_ALL); 937 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) { 938 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL); 939 if (m == NULL) { 940 VM_OBJECT_UNLOCK(uobj); 941 VM_WAIT; 942 VM_OBJECT_LOCK(uobj); 943 goto retry; 944 } else if (m->valid != VM_PAGE_BITS_ALL) { 945 ma[0] = m; 946 rv = vm_pager_get_pages(uobj, ma, 1, 0); 947 m = vm_page_lookup(uobj, idx); 948 } else 949 /* A cached page was reactivated. */ 950 rv = VM_PAGER_OK; 951 vm_page_lock(m); 952 if (rv == VM_PAGER_OK) { 953 vm_page_deactivate(m); 954 vm_page_unlock(m); 955 vm_page_wakeup(m); 956 } else { 957 vm_page_free(m); 958 vm_page_unlock(m); 959 if (ignerr) 960 m = NULL; 961 else { 962 VM_OBJECT_UNLOCK(uobj); 963 return (EIO); 964 } 965 } 966 } 967 if (m != NULL) { 968 pmap_zero_page_area(m, base, PAGE_SIZE - base); 969 vm_page_dirty(m); 970 vm_pager_page_unswapped(m); 971 } 972 } 973 974 /* 975 * Release any swap space and free any whole pages. 976 */ 977 if (newpages < oldpages) { 978 swap_pager_freespace(uobj, newpages, oldpages - 979 newpages); 980 vm_object_page_remove(uobj, newpages, 0, 0); 981 } 982 } 983 uobj->size = newpages; 984 VM_OBJECT_UNLOCK(uobj); 985 986 TMPFS_LOCK(tmp); 987 tmp->tm_pages_used += (newpages - oldpages); 988 TMPFS_UNLOCK(tmp); 989 990 node->tn_size = newsize; 991 vnode_pager_setsize(vp, newsize); 992 return (0); 993} 994 995/* --------------------------------------------------------------------- */ 996 997/* 998 * Change flags of the given vnode. 999 * Caller should execute tmpfs_update on vp after a successful execution. 1000 * The vnode must be locked on entry and remain locked on exit. 1001 */ 1002int 1003tmpfs_chflags(struct vnode *vp, int flags, struct ucred *cred, struct thread *p) 1004{ 1005 int error; 1006 struct tmpfs_node *node; 1007 1008 MPASS(VOP_ISLOCKED(vp)); 1009 1010 node = VP_TO_TMPFS_NODE(vp); 1011 1012 /* Disallow this operation if the file system is mounted read-only. */ 1013 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1014 return EROFS; 1015 1016 /* 1017 * Callers may only modify the file flags on objects they 1018 * have VADMIN rights for. 1019 */ 1020 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1021 return (error); 1022 /* 1023 * Unprivileged processes are not permitted to unset system 1024 * flags, or modify flags if any system flags are set. 1025 */ 1026 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 1027 if (node->tn_flags 1028 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 1029 error = securelevel_gt(cred, 0); 1030 if (error) 1031 return (error); 1032 } 1033 /* Snapshot flag cannot be set or cleared */ 1034 if (((flags & SF_SNAPSHOT) != 0 && 1035 (node->tn_flags & SF_SNAPSHOT) == 0) || 1036 ((flags & SF_SNAPSHOT) == 0 && 1037 (node->tn_flags & SF_SNAPSHOT) != 0)) 1038 return (EPERM); 1039 node->tn_flags = flags; 1040 } else { 1041 if (node->tn_flags 1042 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 1043 (flags & UF_SETTABLE) != flags) 1044 return (EPERM); 1045 node->tn_flags &= SF_SETTABLE; 1046 node->tn_flags |= (flags & UF_SETTABLE); 1047 } 1048 node->tn_status |= TMPFS_NODE_CHANGED; 1049 1050 MPASS(VOP_ISLOCKED(vp)); 1051 1052 return 0; 1053} 1054 1055/* --------------------------------------------------------------------- */ 1056 1057/* 1058 * Change access mode on the given vnode. 1059 * Caller should execute tmpfs_update on vp after a successful execution. 1060 * The vnode must be locked on entry and remain locked on exit. 1061 */ 1062int 1063tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p) 1064{ 1065 int error; 1066 struct tmpfs_node *node; 1067 1068 MPASS(VOP_ISLOCKED(vp)); 1069 1070 node = VP_TO_TMPFS_NODE(vp); 1071 1072 /* Disallow this operation if the file system is mounted read-only. */ 1073 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1074 return EROFS; 1075 1076 /* Immutable or append-only files cannot be modified, either. */ 1077 if (node->tn_flags & (IMMUTABLE | APPEND)) 1078 return EPERM; 1079 1080 /* 1081 * To modify the permissions on a file, must possess VADMIN 1082 * for that file. 1083 */ 1084 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1085 return (error); 1086 1087 /* 1088 * Privileged processes may set the sticky bit on non-directories, 1089 * as well as set the setgid bit on a file with a group that the 1090 * process is not a member of. 1091 */ 1092 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 1093 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 1094 return (EFTYPE); 1095 } 1096 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) { 1097 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 1098 if (error) 1099 return (error); 1100 } 1101 1102 1103 node->tn_mode &= ~ALLPERMS; 1104 node->tn_mode |= mode & ALLPERMS; 1105 1106 node->tn_status |= TMPFS_NODE_CHANGED; 1107 1108 MPASS(VOP_ISLOCKED(vp)); 1109 1110 return 0; 1111} 1112 1113/* --------------------------------------------------------------------- */ 1114 1115/* 1116 * Change ownership of the given vnode. At least one of uid or gid must 1117 * be different than VNOVAL. If one is set to that value, the attribute 1118 * is unchanged. 1119 * Caller should execute tmpfs_update on vp after a successful execution. 1120 * The vnode must be locked on entry and remain locked on exit. 1121 */ 1122int 1123tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 1124 struct thread *p) 1125{ 1126 int error; 1127 struct tmpfs_node *node; 1128 uid_t ouid; 1129 gid_t ogid; 1130 1131 MPASS(VOP_ISLOCKED(vp)); 1132 1133 node = VP_TO_TMPFS_NODE(vp); 1134 1135 /* Assign default values if they are unknown. */ 1136 MPASS(uid != VNOVAL || gid != VNOVAL); 1137 if (uid == VNOVAL) 1138 uid = node->tn_uid; 1139 if (gid == VNOVAL) 1140 gid = node->tn_gid; 1141 MPASS(uid != VNOVAL && gid != VNOVAL); 1142 1143 /* Disallow this operation if the file system is mounted read-only. */ 1144 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1145 return EROFS; 1146 1147 /* Immutable or append-only files cannot be modified, either. */ 1148 if (node->tn_flags & (IMMUTABLE | APPEND)) 1149 return EPERM; 1150 1151 /* 1152 * To modify the ownership of a file, must possess VADMIN for that 1153 * file. 1154 */ 1155 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1156 return (error); 1157 1158 /* 1159 * To change the owner of a file, or change the group of a file to a 1160 * group of which we are not a member, the caller must have 1161 * privilege. 1162 */ 1163 if ((uid != node->tn_uid || 1164 (gid != node->tn_gid && !groupmember(gid, cred))) && 1165 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 1166 return (error); 1167 1168 ogid = node->tn_gid; 1169 ouid = node->tn_uid; 1170 1171 node->tn_uid = uid; 1172 node->tn_gid = gid; 1173 1174 node->tn_status |= TMPFS_NODE_CHANGED; 1175 1176 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) { 1177 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) 1178 node->tn_mode &= ~(S_ISUID | S_ISGID); 1179 } 1180 1181 MPASS(VOP_ISLOCKED(vp)); 1182 1183 return 0; 1184} 1185 1186/* --------------------------------------------------------------------- */ 1187 1188/* 1189 * Change size of the given vnode. 1190 * Caller should execute tmpfs_update on vp after a successful execution. 1191 * The vnode must be locked on entry and remain locked on exit. 1192 */ 1193int 1194tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred, 1195 struct thread *p) 1196{ 1197 int error; 1198 struct tmpfs_node *node; 1199 1200 MPASS(VOP_ISLOCKED(vp)); 1201 1202 node = VP_TO_TMPFS_NODE(vp); 1203 1204 /* Decide whether this is a valid operation based on the file type. */ 1205 error = 0; 1206 switch (vp->v_type) { 1207 case VDIR: 1208 return EISDIR; 1209 1210 case VREG: 1211 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1212 return EROFS; 1213 break; 1214 1215 case VBLK: 1216 /* FALLTHROUGH */ 1217 case VCHR: 1218 /* FALLTHROUGH */ 1219 case VFIFO: 1220 /* Allow modifications of special files even if in the file 1221 * system is mounted read-only (we are not modifying the 1222 * files themselves, but the objects they represent). */ 1223 return 0; 1224 1225 default: 1226 /* Anything else is unsupported. */ 1227 return EOPNOTSUPP; 1228 } 1229 1230 /* Immutable or append-only files cannot be modified, either. */ 1231 if (node->tn_flags & (IMMUTABLE | APPEND)) 1232 return EPERM; 1233 1234 error = tmpfs_truncate(vp, size); 1235 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1236 * for us, as will update tn_status; no need to do that here. */ 1237 1238 MPASS(VOP_ISLOCKED(vp)); 1239 1240 return error; 1241} 1242 1243/* --------------------------------------------------------------------- */ 1244 1245/* 1246 * Change access and modification times of the given vnode. 1247 * Caller should execute tmpfs_update on vp after a successful execution. 1248 * The vnode must be locked on entry and remain locked on exit. 1249 */ 1250int 1251tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime, 1252 struct timespec *birthtime, int vaflags, struct ucred *cred, struct thread *l) 1253{ 1254 int error; 1255 struct tmpfs_node *node; 1256 1257 MPASS(VOP_ISLOCKED(vp)); 1258 1259 node = VP_TO_TMPFS_NODE(vp); 1260 1261 /* Disallow this operation if the file system is mounted read-only. */ 1262 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1263 return EROFS; 1264 1265 /* Immutable or append-only files cannot be modified, either. */ 1266 if (node->tn_flags & (IMMUTABLE | APPEND)) 1267 return EPERM; 1268 1269 /* Determine if the user have proper privilege to update time. */ 1270 if (vaflags & VA_UTIMES_NULL) { 1271 error = VOP_ACCESS(vp, VADMIN, cred, l); 1272 if (error) 1273 error = VOP_ACCESS(vp, VWRITE, cred, l); 1274 } else 1275 error = VOP_ACCESS(vp, VADMIN, cred, l); 1276 if (error) 1277 return (error); 1278 1279 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL) 1280 node->tn_status |= TMPFS_NODE_ACCESSED; 1281 1282 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL) 1283 node->tn_status |= TMPFS_NODE_MODIFIED; 1284 1285 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL) 1286 node->tn_status |= TMPFS_NODE_MODIFIED; 1287 1288 tmpfs_itimes(vp, atime, mtime); 1289 1290 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL) 1291 node->tn_birthtime = *birthtime; 1292 MPASS(VOP_ISLOCKED(vp)); 1293 1294 return 0; 1295} 1296 1297/* --------------------------------------------------------------------- */ 1298/* Sync timestamps */ 1299void 1300tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1301 const struct timespec *mod) 1302{ 1303 struct tmpfs_node *node; 1304 struct timespec now; 1305 1306 node = VP_TO_TMPFS_NODE(vp); 1307 1308 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1309 TMPFS_NODE_CHANGED)) == 0) 1310 return; 1311 1312 vfs_timestamp(&now); 1313 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1314 if (acc == NULL) 1315 acc = &now; 1316 node->tn_atime = *acc; 1317 } 1318 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1319 if (mod == NULL) 1320 mod = &now; 1321 node->tn_mtime = *mod; 1322 } 1323 if (node->tn_status & TMPFS_NODE_CHANGED) { 1324 node->tn_ctime = now; 1325 } 1326 node->tn_status &= 1327 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED); 1328} 1329 1330/* --------------------------------------------------------------------- */ 1331 1332void 1333tmpfs_update(struct vnode *vp) 1334{ 1335 1336 tmpfs_itimes(vp, NULL, NULL); 1337} 1338 1339/* --------------------------------------------------------------------- */ 1340 1341int 1342tmpfs_truncate(struct vnode *vp, off_t length) 1343{ 1344 int error; 1345 struct tmpfs_node *node; 1346 1347 node = VP_TO_TMPFS_NODE(vp); 1348 1349 if (length < 0) { 1350 error = EINVAL; 1351 goto out; 1352 } 1353 1354 if (node->tn_size == length) { 1355 error = 0; 1356 goto out; 1357 } 1358 1359 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1360 return (EFBIG); 1361 1362 error = tmpfs_reg_resize(vp, length, FALSE); 1363 if (error == 0) { 1364 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1365 } 1366 1367out: 1368 tmpfs_update(vp); 1369 1370 return error; 1371} 1372