tmpfs_subr.c revision 1.34.4.6
1 /* $NetBSD: tmpfs_subr.c,v 1.34.4.6 2007/09/16 18:32:36 ad Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006, 2007 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Efficient memory file system supporting functions. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: tmpfs_subr.c,v 1.34.4.6 2007/09/16 18:32:36 ad Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/dirent.h> 49 #include <sys/event.h> 50 #include <sys/malloc.h> 51 #include <sys/mount.h> 52 #include <sys/namei.h> 53 #include <sys/time.h> 54 #include <sys/stat.h> 55 #include <sys/systm.h> 56 #include <sys/swap.h> 57 #include <sys/vnode.h> 58 #include <sys/kauth.h> 59 #include <sys/proc.h> 60 61 #include <uvm/uvm.h> 62 63 #include <miscfs/specfs/specdev.h> 64 #include <fs/tmpfs/tmpfs.h> 65 #include <fs/tmpfs/tmpfs_fifoops.h> 66 #include <fs/tmpfs/tmpfs_specops.h> 67 #include <fs/tmpfs/tmpfs_vnops.h> 68 69 /* --------------------------------------------------------------------- */ 70 71 /* 72 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 73 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 74 * using the credentials of the process 'p'. 75 * 76 * If the node type is set to 'VDIR', then the parent parameter must point 77 * to the parent directory of the node being created. It may only be NULL 78 * while allocating the root node. 79 * 80 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 81 * specifies the device the node represents. 82 * 83 * If the node type is set to 'VLNK', then the parameter target specifies 84 * the file name of the target file for the symbolic link that is being 85 * created. 86 * 87 * Note that new nodes are retrieved from the available list if it has 88 * items or, if it is empty, from the node pool as long as there is enough 89 * space to create them. 90 * 91 * Returns zero on success or an appropriate error code on failure. 92 */ 93 int 94 tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type, 95 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent, 96 char *target, dev_t rdev, struct proc *p, struct tmpfs_node **node) 97 { 98 struct tmpfs_node *nnode; 99 ino_t ino; 100 101 /* If the root directory of the 'tmp' file system is not yet 102 * allocated, this must be the request to do it. */ 103 KASSERT(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR)); 104 105 KASSERT(IFF(type == VLNK, target != NULL)); 106 KASSERT(IFF(type == VBLK || type == VCHR, rdev != VNOVAL)); 107 108 KASSERT(uid != VNOVAL && gid != VNOVAL && mode != VNOVAL); 109 110 nnode = NULL; 111 mutex_enter(&tmp->tm_lock); 112 if (LIST_EMPTY(&tmp->tm_nodes_avail)) { 113 KASSERT(tmp->tm_nodes_last <= tmp->tm_nodes_max); 114 if (tmp->tm_nodes_last == tmp->tm_nodes_max) { 115 mutex_exit(&tmp->tm_lock); 116 return ENOSPC; 117 } 118 ino = tmp->tm_nodes_last++; 119 mutex_exit(&tmp->tm_lock); 120 121 nnode = 122 (struct tmpfs_node *)TMPFS_POOL_GET(&tmp->tm_node_pool, 0); 123 if (nnode == NULL) { 124 mutex_enter(&tmp->tm_lock); 125 if (ino == tmp->tm_nodes_last - 1) 126 tmp->tm_nodes_last--; 127 else { 128 /* XXX Oops, just threw away inode number */ 129 } 130 mutex_exit(&tmp->tm_lock); 131 return ENOSPC; 132 } 133 nnode->tn_id = ino; 134 nnode->tn_gen = arc4random(); 135 mutex_init(&nnode->tn_vlock, MUTEX_DEFAULT, IPL_NONE); 136 137 mutex_enter(&tmp->tm_lock); 138 } else { 139 nnode = LIST_FIRST(&tmp->tm_nodes_avail); 140 LIST_REMOVE(nnode, tn_entries); 141 nnode->tn_gen++; 142 } 143 KASSERT(nnode != NULL); 144 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 145 mutex_exit(&tmp->tm_lock); 146 147 /* Generic initialization. */ 148 nnode->tn_type = type; 149 nnode->tn_size = 0; 150 nnode->tn_status = 0; 151 nnode->tn_flags = 0; 152 nnode->tn_links = 0; 153 getnanotime(&nnode->tn_atime); 154 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime = 155 nnode->tn_atime; 156 nnode->tn_uid = uid; 157 nnode->tn_gid = gid; 158 nnode->tn_mode = mode; 159 nnode->tn_lockf = NULL; 160 nnode->tn_vnode = NULL; 161 162 /* Type-specific initialization. */ 163 switch (nnode->tn_type) { 164 case VBLK: 165 case VCHR: 166 nnode->tn_spec.tn_dev.tn_rdev = rdev; 167 break; 168 169 case VDIR: 170 TAILQ_INIT(&nnode->tn_spec.tn_dir.tn_dir); 171 nnode->tn_spec.tn_dir.tn_parent = 172 (parent == NULL) ? nnode : parent; 173 nnode->tn_spec.tn_dir.tn_readdir_lastn = 0; 174 nnode->tn_spec.tn_dir.tn_readdir_lastp = NULL; 175 nnode->tn_links++; 176 nnode->tn_spec.tn_dir.tn_parent->tn_links++; 177 if (parent != NULL) { 178 KASSERT(parent->tn_vnode != NULL); 179 VN_KNOTE(parent->tn_vnode, NOTE_LINK); 180 } 181 break; 182 183 case VFIFO: 184 /* FALLTHROUGH */ 185 case VSOCK: 186 break; 187 188 case VLNK: 189 KASSERT(strlen(target) < MAXPATHLEN); 190 nnode->tn_size = strlen(target); 191 nnode->tn_spec.tn_lnk.tn_link = 192 tmpfs_str_pool_get(&tmp->tm_str_pool, nnode->tn_size, 0); 193 if (nnode->tn_spec.tn_lnk.tn_link == NULL) { 194 nnode->tn_type = VNON; 195 tmpfs_free_node(tmp, nnode); 196 return ENOSPC; 197 } 198 memcpy(nnode->tn_spec.tn_lnk.tn_link, target, nnode->tn_size); 199 break; 200 201 case VREG: 202 nnode->tn_spec.tn_reg.tn_aobj = 203 uao_create(INT32_MAX - PAGE_SIZE, 0); 204 nnode->tn_spec.tn_reg.tn_aobj_pages = 0; 205 break; 206 207 default: 208 KASSERT(0); 209 } 210 211 *node = nnode; 212 return 0; 213 } 214 215 /* --------------------------------------------------------------------- */ 216 217 /* 218 * Destroys the node pointed to by node from the file system 'tmp'. 219 * If the node does not belong to the given mount point, the results are 220 * unpredicted. 221 * 222 * If the node references a directory; no entries are allowed because 223 * their removal could need a recursive algorithm, something forbidden in 224 * kernel space. Furthermore, there is not need to provide such 225 * functionality (recursive removal) because the only primitives offered 226 * to the user are the removal of empty directories and the deletion of 227 * individual files. 228 * 229 * Note that nodes are not really deleted; in fact, when a node has been 230 * allocated, it cannot be deleted during the whole life of the file 231 * system. Instead, they are moved to the available list and remain there 232 * until reused. 233 */ 234 void 235 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 236 { 237 size_t pages; 238 239 if (node->tn_type == VREG) 240 pages = node->tn_spec.tn_reg.tn_aobj_pages; 241 else 242 pages = 0; 243 244 mutex_enter(&tmp->tm_lock); 245 tmp->tm_pages_used -= pages; 246 LIST_REMOVE(node, tn_entries); 247 mutex_exit(&tmp->tm_lock); 248 249 switch (node->tn_type) { 250 case VLNK: 251 tmpfs_str_pool_put(&tmp->tm_str_pool, 252 node->tn_spec.tn_lnk.tn_link, node->tn_size); 253 break; 254 255 case VREG: 256 if (node->tn_spec.tn_reg.tn_aobj != NULL) 257 uao_detach(node->tn_spec.tn_reg.tn_aobj); 258 break; 259 260 default: 261 break; 262 } 263 264 mutex_enter(&tmp->tm_lock); 265 node->tn_type = VNON; 266 LIST_INSERT_HEAD(&tmp->tm_nodes_avail, node, tn_entries); 267 mutex_exit(&tmp->tm_lock); 268 } 269 270 /* --------------------------------------------------------------------- */ 271 272 /* 273 * Allocates a new directory entry for the node node with a name of name. 274 * The new directory entry is returned in *de. 275 * 276 * The link count of node is increased by one to reflect the new object 277 * referencing it. This takes care of notifying kqueue listeners about 278 * this change. 279 * 280 * Returns zero on success or an appropriate error code on failure. 281 */ 282 int 283 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 284 const char *name, uint16_t len, struct tmpfs_dirent **de) 285 { 286 struct tmpfs_dirent *nde; 287 288 nde = (struct tmpfs_dirent *)TMPFS_POOL_GET(&tmp->tm_dirent_pool, 0); 289 if (nde == NULL) 290 return ENOSPC; 291 292 nde->td_name = tmpfs_str_pool_get(&tmp->tm_str_pool, len, 0); 293 if (nde->td_name == NULL) { 294 TMPFS_POOL_PUT(&tmp->tm_dirent_pool, nde); 295 return ENOSPC; 296 } 297 nde->td_namelen = len; 298 memcpy(nde->td_name, name, len); 299 nde->td_node = node; 300 301 node->tn_links++; 302 if (node->tn_links > 1 && node->tn_vnode != NULL) 303 VN_KNOTE(node->tn_vnode, NOTE_LINK); 304 *de = nde; 305 306 return 0; 307 } 308 309 /* --------------------------------------------------------------------- */ 310 311 /* 312 * Frees a directory entry. It is the caller's responsibility to destroy 313 * the node referenced by it if needed. 314 * 315 * The link count of node is decreased by one to reflect the removal of an 316 * object that referenced it. This only happens if 'node_exists' is true; 317 * otherwise the function will not access the node referred to by the 318 * directory entry, as it may already have been released from the outside. 319 * 320 * Interested parties (kqueue) are notified of the link count change; note 321 * that this can include both the node pointed to by the directory entry 322 * as well as its parent. 323 */ 324 void 325 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de, 326 bool node_exists) 327 { 328 if (node_exists) { 329 struct tmpfs_node *node; 330 331 node = de->td_node; 332 333 KASSERT(node->tn_links > 0); 334 node->tn_links--; 335 if (node->tn_vnode != NULL) 336 VN_KNOTE(node->tn_vnode, node->tn_links == 0 ? 337 NOTE_DELETE : NOTE_LINK); 338 if (node->tn_type == VDIR) 339 VN_KNOTE(node->tn_spec.tn_dir.tn_parent->tn_vnode, 340 NOTE_LINK); 341 } 342 343 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, de->td_namelen); 344 TMPFS_POOL_PUT(&tmp->tm_dirent_pool, de); 345 } 346 347 /* --------------------------------------------------------------------- */ 348 349 /* 350 * Allocates a new vnode for the node node or returns a new reference to 351 * an existing one if the node had already a vnode referencing it. The 352 * resulting locked vnode is returned in *vpp. 353 * 354 * Returns zero on success or an appropriate error code on failure. 355 */ 356 int 357 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, struct vnode **vpp) 358 { 359 int error; 360 struct vnode *nvp; 361 struct vnode *vp; 362 363 mutex_enter(&node->tn_vlock); 364 if ((vp = node->tn_vnode) != NULL) { 365 mutex_enter(&vp->v_interlock); 366 mutex_exit(&node->tn_vlock); 367 vget(vp, LK_EXCLUSIVE | LK_RETRY | LK_INTERLOCK); 368 *vpp = vp; 369 return 0; 370 } 371 372 /* Get a new vnode and associate it with our node. */ 373 error = getnewvnode(VT_TMPFS, mp, tmpfs_vnodeop_p, &vp); 374 if (error != 0) { 375 mutex_exit(&node->tn_vlock); 376 return error; 377 } 378 379 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 380 if (error != 0) { 381 mutex_exit(&node->tn_vlock); 382 ungetnewvnode(vp); 383 return error; 384 } 385 386 vp->v_type = node->tn_type; 387 388 /* Type-specific initialization. */ 389 switch (node->tn_type) { 390 case VBLK: 391 /* FALLTHROUGH */ 392 case VCHR: 393 vp->v_op = tmpfs_specop_p; 394 nvp = checkalias(vp, node->tn_spec.tn_dev.tn_rdev, mp); 395 if (nvp != NULL) { 396 /* Discard unneeded vnode, but save its inode. */ 397 nvp->v_data = node; 398 399 /* XXX spec_vnodeops has no locking, so we have to 400 * do it explicitly. */ 401 VOP_UNLOCK(vp, 0); 402 vp->v_op = spec_vnodeop_p; 403 mutex_enter(&vp->v_interlock); 404 vp->v_iflag &= ~VI_LOCKSWORK; 405 mutex_exit(&vp->v_interlock); 406 vgone(vp); 407 408 /* Reinitialize aliased node. */ 409 vp = nvp; 410 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 411 if (error != 0) { 412 mutex_exit(&node->tn_vlock); 413 return error; 414 } 415 } 416 break; 417 418 case VDIR: 419 vp->v_vflag |= (node->tn_spec.tn_dir.tn_parent == node ? VV_ROOT : 0); 420 break; 421 422 case VFIFO: 423 vp->v_op = tmpfs_fifoop_p; 424 break; 425 426 case VLNK: 427 /* FALLTHROUGH */ 428 case VREG: 429 /* FALLTHROUGH */ 430 case VSOCK: 431 break; 432 433 default: 434 KASSERT(0); 435 } 436 437 uvm_vnp_setsize(vp, node->tn_size); 438 vp->v_data = node; 439 node->tn_vnode = vp; 440 mutex_exit(&node->tn_vlock); 441 *vpp = vp; 442 443 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 444 445 return error; 446 } 447 448 /* --------------------------------------------------------------------- */ 449 450 /* 451 * Destroys the association between the vnode vp and the node it 452 * references. 453 */ 454 void 455 tmpfs_free_vp(struct vnode *vp) 456 { 457 struct tmpfs_node *node; 458 459 node = VP_TO_TMPFS_NODE(vp); 460 461 mutex_enter(&node->tn_vlock); 462 node->tn_vnode = NULL; 463 mutex_exit(&node->tn_vlock); 464 vp->v_data = NULL; 465 } 466 467 /* --------------------------------------------------------------------- */ 468 469 /* 470 * Allocates a new file of type 'type' and adds it to the parent directory 471 * 'dvp'; this addition is done using the component name given in 'cnp'. 472 * The ownership of the new file is automatically assigned based on the 473 * credentials of the caller (through 'cnp'), the group is set based on 474 * the parent directory and the mode is determined from the 'vap' argument. 475 * If successful, *vpp holds a vnode to the newly created file and zero 476 * is returned. Otherwise *vpp is NULL and the function returns an 477 * appropriate error code. 478 */ 479 int 480 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 481 struct componentname *cnp, char *target) 482 { 483 int error; 484 struct tmpfs_dirent *de; 485 struct tmpfs_mount *tmp; 486 struct tmpfs_node *dnode; 487 struct tmpfs_node *node; 488 struct tmpfs_node *parent; 489 490 KASSERT(VOP_ISLOCKED(dvp)); 491 KASSERT(cnp->cn_flags & HASBUF); 492 493 tmp = VFS_TO_TMPFS(dvp->v_mount); 494 dnode = VP_TO_TMPFS_DIR(dvp); 495 *vpp = NULL; 496 497 /* If the entry we are creating is a directory, we cannot overflow 498 * the number of links of its parent, because it will get a new 499 * link. */ 500 if (vap->va_type == VDIR) { 501 /* Ensure that we do not overflow the maximum number of links 502 * imposed by the system. */ 503 KASSERT(dnode->tn_links <= LINK_MAX); 504 if (dnode->tn_links == LINK_MAX) { 505 error = EMLINK; 506 goto out; 507 } 508 509 parent = dnode; 510 } else 511 parent = NULL; 512 513 /* Allocate a node that represents the new file. */ 514 error = tmpfs_alloc_node(tmp, vap->va_type, kauth_cred_geteuid(cnp->cn_cred), 515 dnode->tn_gid, vap->va_mode, parent, target, vap->va_rdev, 516 cnp->cn_lwp->l_proc, &node); 517 if (error != 0) 518 goto out; 519 520 /* Allocate a directory entry that points to the new file. */ 521 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen, 522 &de); 523 if (error != 0) { 524 tmpfs_free_node(tmp, node); 525 goto out; 526 } 527 528 /* Allocate a vnode for the new file. */ 529 error = tmpfs_alloc_vp(dvp->v_mount, node, vpp); 530 if (error != 0) { 531 tmpfs_free_dirent(tmp, de, true); 532 tmpfs_free_node(tmp, node); 533 goto out; 534 } 535 536 /* Now that all required items are allocated, we can proceed to 537 * insert the new node into the directory, an operation that 538 * cannot fail. */ 539 tmpfs_dir_attach(dvp, de); 540 541 out: 542 if (error != 0 || !(cnp->cn_flags & SAVESTART)) 543 PNBUF_PUT(cnp->cn_pnbuf); 544 vput(dvp); 545 546 KASSERT(IFF(error == 0, *vpp != NULL)); 547 548 return error; 549 } 550 551 /* --------------------------------------------------------------------- */ 552 553 /* 554 * Attaches the directory entry de to the directory represented by vp. 555 * Note that this does not change the link count of the node pointed by 556 * the directory entry, as this is done by tmpfs_alloc_dirent. 557 * 558 * As the "parent" directory changes, interested parties are notified of 559 * a write to it. 560 */ 561 void 562 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de) 563 { 564 struct tmpfs_node *dnode; 565 566 dnode = VP_TO_TMPFS_DIR(vp); 567 568 TAILQ_INSERT_TAIL(&dnode->tn_spec.tn_dir.tn_dir, de, td_entries); 569 dnode->tn_size += sizeof(struct tmpfs_dirent); 570 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 571 TMPFS_NODE_MODIFIED; 572 uvm_vnp_setsize(vp, dnode->tn_size); 573 574 VN_KNOTE(vp, NOTE_WRITE); 575 } 576 577 /* --------------------------------------------------------------------- */ 578 579 /* 580 * Detaches the directory entry de from the directory represented by vp. 581 * Note that this does not change the link count of the node pointed by 582 * the directory entry, as this is done by tmpfs_free_dirent. 583 * 584 * As the "parent" directory changes, interested parties are notified of 585 * a write to it. 586 */ 587 void 588 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de) 589 { 590 struct tmpfs_node *dnode; 591 592 KASSERT(VOP_ISLOCKED(vp)); 593 594 dnode = VP_TO_TMPFS_DIR(vp); 595 596 if (dnode->tn_spec.tn_dir.tn_readdir_lastp == de) { 597 dnode->tn_spec.tn_dir.tn_readdir_lastn = 0; 598 dnode->tn_spec.tn_dir.tn_readdir_lastp = NULL; 599 } 600 601 TAILQ_REMOVE(&dnode->tn_spec.tn_dir.tn_dir, de, td_entries); 602 dnode->tn_size -= sizeof(struct tmpfs_dirent); 603 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 604 TMPFS_NODE_MODIFIED; 605 uvm_vnp_setsize(vp, dnode->tn_size); 606 607 VN_KNOTE(vp, NOTE_WRITE); 608 } 609 610 /* --------------------------------------------------------------------- */ 611 612 /* 613 * Looks for a directory entry in the directory represented by node. 614 * 'cnp' describes the name of the entry to look for. Note that the . 615 * and .. components are not allowed as they do not physically exist 616 * within directories. 617 * 618 * Returns a pointer to the entry when found, otherwise NULL. 619 */ 620 struct tmpfs_dirent * 621 tmpfs_dir_lookup(struct tmpfs_node *node, struct componentname *cnp) 622 { 623 struct tmpfs_dirent *de; 624 625 KASSERT(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.')); 626 KASSERT(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' && 627 cnp->cn_nameptr[1] == '.'))); 628 TMPFS_VALIDATE_DIR(node); 629 630 node->tn_status |= TMPFS_NODE_ACCESSED; 631 632 TAILQ_FOREACH(de, &node->tn_spec.tn_dir.tn_dir, td_entries) { 633 KASSERT(cnp->cn_namelen < 0xffff); 634 if (de->td_namelen == (uint16_t)cnp->cn_namelen && 635 memcmp(de->td_name, cnp->cn_nameptr, de->td_namelen) == 0) 636 break; 637 } 638 639 return de; 640 } 641 642 /* --------------------------------------------------------------------- */ 643 644 /* 645 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 646 * directory and returns it in the uio space. The function returns 0 647 * on success, -1 if there was not enough space in the uio structure to 648 * hold the directory entry or an appropriate error code if another 649 * error happens. 650 */ 651 int 652 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 653 { 654 int error; 655 struct dirent dent; 656 657 TMPFS_VALIDATE_DIR(node); 658 KASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 659 660 dent.d_fileno = node->tn_id; 661 dent.d_type = DT_DIR; 662 dent.d_namlen = 1; 663 dent.d_name[0] = '.'; 664 dent.d_name[1] = '\0'; 665 dent.d_reclen = _DIRENT_SIZE(&dent); 666 667 if (dent.d_reclen > uio->uio_resid) 668 error = -1; 669 else { 670 error = uiomove(&dent, dent.d_reclen, uio); 671 if (error == 0) 672 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 673 } 674 675 node->tn_status |= TMPFS_NODE_ACCESSED; 676 677 return error; 678 } 679 680 /* --------------------------------------------------------------------- */ 681 682 /* 683 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 684 * directory and returns it in the uio space. The function returns 0 685 * on success, -1 if there was not enough space in the uio structure to 686 * hold the directory entry or an appropriate error code if another 687 * error happens. 688 */ 689 int 690 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio) 691 { 692 int error; 693 struct dirent dent; 694 695 TMPFS_VALIDATE_DIR(node); 696 KASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 697 698 dent.d_fileno = node->tn_spec.tn_dir.tn_parent->tn_id; 699 dent.d_type = DT_DIR; 700 dent.d_namlen = 2; 701 dent.d_name[0] = '.'; 702 dent.d_name[1] = '.'; 703 dent.d_name[2] = '\0'; 704 dent.d_reclen = _DIRENT_SIZE(&dent); 705 706 if (dent.d_reclen > uio->uio_resid) 707 error = -1; 708 else { 709 error = uiomove(&dent, dent.d_reclen, uio); 710 if (error == 0) { 711 struct tmpfs_dirent *de; 712 713 de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir); 714 if (de == NULL) 715 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 716 else 717 uio->uio_offset = tmpfs_dircookie(de); 718 } 719 } 720 721 node->tn_status |= TMPFS_NODE_ACCESSED; 722 723 return error; 724 } 725 726 /* --------------------------------------------------------------------- */ 727 728 /* 729 * Lookup a directory entry by its associated cookie. 730 */ 731 struct tmpfs_dirent * 732 tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie) 733 { 734 struct tmpfs_dirent *de; 735 736 if (cookie == node->tn_spec.tn_dir.tn_readdir_lastn && 737 node->tn_spec.tn_dir.tn_readdir_lastp != NULL) { 738 return node->tn_spec.tn_dir.tn_readdir_lastp; 739 } 740 741 TAILQ_FOREACH(de, &node->tn_spec.tn_dir.tn_dir, td_entries) { 742 if (tmpfs_dircookie(de) == cookie) { 743 break; 744 } 745 } 746 747 return de; 748 } 749 750 /* --------------------------------------------------------------------- */ 751 752 /* 753 * Helper function for tmpfs_readdir. Returns as much directory entries 754 * as can fit in the uio space. The read starts at uio->uio_offset. 755 * The function returns 0 on success, -1 if there was not enough space 756 * in the uio structure to hold the directory entry or an appropriate 757 * error code if another error happens. 758 */ 759 int 760 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp) 761 { 762 int error; 763 off_t startcookie; 764 struct tmpfs_dirent *de; 765 766 TMPFS_VALIDATE_DIR(node); 767 768 /* Locate the first directory entry we have to return. We have cached 769 * the last readdir in the node, so use those values if appropriate. 770 * Otherwise do a linear scan to find the requested entry. */ 771 startcookie = uio->uio_offset; 772 KASSERT(startcookie != TMPFS_DIRCOOKIE_DOT); 773 KASSERT(startcookie != TMPFS_DIRCOOKIE_DOTDOT); 774 if (startcookie == TMPFS_DIRCOOKIE_EOF) { 775 return 0; 776 } else { 777 de = tmpfs_dir_lookupbycookie(node, startcookie); 778 } 779 if (de == NULL) { 780 return EINVAL; 781 } 782 783 /* Read as much entries as possible; i.e., until we reach the end of 784 * the directory or we exhaust uio space. */ 785 do { 786 struct dirent d; 787 788 /* Create a dirent structure representing the current 789 * tmpfs_node and fill it. */ 790 d.d_fileno = de->td_node->tn_id; 791 switch (de->td_node->tn_type) { 792 case VBLK: 793 d.d_type = DT_BLK; 794 break; 795 796 case VCHR: 797 d.d_type = DT_CHR; 798 break; 799 800 case VDIR: 801 d.d_type = DT_DIR; 802 break; 803 804 case VFIFO: 805 d.d_type = DT_FIFO; 806 break; 807 808 case VLNK: 809 d.d_type = DT_LNK; 810 break; 811 812 case VREG: 813 d.d_type = DT_REG; 814 break; 815 816 case VSOCK: 817 d.d_type = DT_SOCK; 818 break; 819 820 default: 821 KASSERT(0); 822 } 823 d.d_namlen = de->td_namelen; 824 KASSERT(de->td_namelen < sizeof(d.d_name)); 825 (void)memcpy(d.d_name, de->td_name, de->td_namelen); 826 d.d_name[de->td_namelen] = '\0'; 827 d.d_reclen = _DIRENT_SIZE(&d); 828 829 /* Stop reading if the directory entry we are treating is 830 * bigger than the amount of data that can be returned. */ 831 if (d.d_reclen > uio->uio_resid) { 832 error = -1; 833 break; 834 } 835 836 /* Copy the new dirent structure into the output buffer and 837 * advance pointers. */ 838 error = uiomove(&d, d.d_reclen, uio); 839 840 (*cntp)++; 841 de = TAILQ_NEXT(de, td_entries); 842 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 843 844 /* Update the offset and cache. */ 845 if (de == NULL) { 846 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 847 node->tn_spec.tn_dir.tn_readdir_lastn = 0; 848 node->tn_spec.tn_dir.tn_readdir_lastp = NULL; 849 } else { 850 node->tn_spec.tn_dir.tn_readdir_lastn = uio->uio_offset = 851 tmpfs_dircookie(de); 852 node->tn_spec.tn_dir.tn_readdir_lastp = de; 853 } 854 855 node->tn_status |= TMPFS_NODE_ACCESSED; 856 857 return error; 858 } 859 860 /* --------------------------------------------------------------------- */ 861 862 /* 863 * Resizes the aobj associated to the regular file pointed to by vp to 864 * the size newsize. 'vp' must point to a vnode that represents a regular 865 * file. 'newsize' must be positive. 866 * 867 * If the file is extended, the appropriate kevent is raised. This does 868 * not rise a write event though because resizing is not the same as 869 * writing. 870 * 871 * Returns zero on success or an appropriate error code on failure. 872 */ 873 int 874 tmpfs_reg_resize(struct vnode *vp, off_t newsize) 875 { 876 int error; 877 size_t newpages, oldpages; 878 struct tmpfs_mount *tmp; 879 struct tmpfs_node *node; 880 off_t oldsize; 881 882 KASSERT(vp->v_type == VREG); 883 KASSERT(newsize >= 0); 884 885 node = VP_TO_TMPFS_NODE(vp); 886 tmp = VFS_TO_TMPFS(vp->v_mount); 887 888 /* Convert the old and new sizes to the number of pages needed to 889 * store them. It may happen that we do not need to do anything 890 * because the last allocated page can accommodate the change on 891 * its own. */ 892 oldsize = node->tn_size; 893 oldpages = round_page(oldsize) / PAGE_SIZE; 894 KASSERT(oldpages == node->tn_spec.tn_reg.tn_aobj_pages); 895 newpages = round_page(newsize) / PAGE_SIZE; 896 897 mutex_enter(&tmp->tm_lock); 898 if (newpages > oldpages && 899 newpages - oldpages > TMPFS_PAGES_AVAIL(tmp)) { 900 error = ENOSPC; 901 mutex_exit(&tmp->tm_lock); 902 goto out; 903 } 904 tmp->tm_pages_used += (newpages - oldpages); 905 mutex_exit(&tmp->tm_lock); 906 907 if (newsize < oldsize) { 908 int zerolen = MIN(round_page(newsize), node->tn_size) - newsize; 909 910 /* 911 * free "backing store" 912 */ 913 914 if (newpages < oldpages) { 915 struct uvm_object *uobj; 916 917 uobj = node->tn_spec.tn_reg.tn_aobj; 918 919 mutex_enter(&uobj->vmobjlock); 920 uao_dropswap_range(uobj, newpages, oldpages); 921 mutex_exit(&uobj->vmobjlock); 922 } 923 924 /* 925 * zero out the truncated part of the last page. 926 */ 927 928 uvm_vnp_zerorange(vp, newsize, zerolen); 929 } 930 931 node->tn_spec.tn_reg.tn_aobj_pages = newpages; 932 node->tn_size = newsize; 933 uvm_vnp_setsize(vp, newsize); 934 935 error = 0; 936 937 if (newsize > oldsize) 938 VN_KNOTE(vp, NOTE_EXTEND); 939 940 out: 941 return error; 942 } 943 944 /* --------------------------------------------------------------------- */ 945 946 /* 947 * Returns information about the number of available memory pages, 948 * including physical and virtual ones. 949 * 950 * If 'total' is true, the value returned is the total amount of memory 951 * pages configured for the system (either in use or free). 952 * If it is FALSE, the value returned is the amount of free memory pages. 953 * 954 * Remember to remove TMPFS_PAGES_RESERVED from the returned value to avoid 955 * excessive memory usage. 956 * 957 */ 958 size_t 959 tmpfs_mem_info(bool total) 960 { 961 size_t size; 962 963 size = 0; 964 size += uvmexp.swpgavail; 965 if (!total) { 966 size -= uvmexp.swpgonly; 967 } 968 size += uvmexp.free; 969 size += uvmexp.filepages; 970 if (size > uvmexp.wired) { 971 size -= uvmexp.wired; 972 } else { 973 size = 0; 974 } 975 976 return size; 977 } 978 979 /* --------------------------------------------------------------------- */ 980 981 /* 982 * Change flags of the given vnode. 983 * Caller should execute tmpfs_update on vp after a successful execution. 984 * The vnode must be locked on entry and remain locked on exit. 985 */ 986 int 987 tmpfs_chflags(struct vnode *vp, int flags, kauth_cred_t cred, struct lwp *l) 988 { 989 int error; 990 struct tmpfs_node *node; 991 992 KASSERT(VOP_ISLOCKED(vp)); 993 994 node = VP_TO_TMPFS_NODE(vp); 995 996 /* Disallow this operation if the file system is mounted read-only. */ 997 if (vp->v_mount->mnt_flag & MNT_RDONLY) 998 return EROFS; 999 1000 /* XXX: The following comes from UFS code, and can be found in 1001 * several other file systems. Shouldn't this be centralized 1002 * somewhere? */ 1003 if (kauth_cred_geteuid(cred) != node->tn_uid && 1004 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 1005 NULL))) 1006 return error; 1007 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) == 0) { 1008 /* The super-user is only allowed to change flags if the file 1009 * wasn't protected before and the securelevel is zero. */ 1010 if ((node->tn_flags & (SF_IMMUTABLE | SF_APPEND)) && 1011 kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHSYSFLAGS, 1012 0, NULL, NULL, NULL)) 1013 return EPERM; 1014 node->tn_flags = flags; 1015 } else { 1016 /* Regular users can change flags provided they only want to 1017 * change user-specific ones, not those reserved for the 1018 * super-user. */ 1019 if ((node->tn_flags & (SF_IMMUTABLE | SF_APPEND)) || 1020 (flags & UF_SETTABLE) != flags) 1021 return EPERM; 1022 if ((node->tn_flags & SF_SETTABLE) != (flags & SF_SETTABLE)) 1023 return EPERM; 1024 node->tn_flags &= SF_SETTABLE; 1025 node->tn_flags |= (flags & UF_SETTABLE); 1026 } 1027 1028 node->tn_status |= TMPFS_NODE_CHANGED; 1029 VN_KNOTE(vp, NOTE_ATTRIB); 1030 1031 KASSERT(VOP_ISLOCKED(vp)); 1032 1033 return 0; 1034 } 1035 1036 /* --------------------------------------------------------------------- */ 1037 1038 /* 1039 * Change access mode on the given vnode. 1040 * Caller should execute tmpfs_update on vp after a successful execution. 1041 * The vnode must be locked on entry and remain locked on exit. 1042 */ 1043 int 1044 tmpfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) 1045 { 1046 int error, ismember = 0; 1047 struct tmpfs_node *node; 1048 1049 KASSERT(VOP_ISLOCKED(vp)); 1050 1051 node = VP_TO_TMPFS_NODE(vp); 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 1057 /* Immutable or append-only files cannot be modified, either. */ 1058 if (node->tn_flags & (IMMUTABLE | APPEND)) 1059 return EPERM; 1060 1061 /* XXX: The following comes from UFS code, and can be found in 1062 * several other file systems. Shouldn't this be centralized 1063 * somewhere? */ 1064 if (kauth_cred_geteuid(cred) != node->tn_uid && 1065 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 1066 NULL))) 1067 return error; 1068 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 1069 if (vp->v_type != VDIR && (mode & S_ISTXT)) 1070 return EFTYPE; 1071 1072 if ((kauth_cred_ismember_gid(cred, node->tn_gid, 1073 &ismember) != 0 || !ismember) && (mode & S_ISGID)) 1074 return EPERM; 1075 } 1076 1077 node->tn_mode = (mode & ALLPERMS); 1078 1079 node->tn_status |= TMPFS_NODE_CHANGED; 1080 VN_KNOTE(vp, NOTE_ATTRIB); 1081 1082 KASSERT(VOP_ISLOCKED(vp)); 1083 1084 return 0; 1085 } 1086 1087 /* --------------------------------------------------------------------- */ 1088 1089 /* 1090 * Change ownership of the given vnode. At least one of uid or gid must 1091 * be different than VNOVAL. If one is set to that value, the attribute 1092 * is unchanged. 1093 * Caller should execute tmpfs_update on vp after a successful execution. 1094 * The vnode must be locked on entry and remain locked on exit. 1095 */ 1096 int 1097 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 1098 struct lwp *l) 1099 { 1100 int error, ismember = 0; 1101 struct tmpfs_node *node; 1102 1103 KASSERT(VOP_ISLOCKED(vp)); 1104 1105 node = VP_TO_TMPFS_NODE(vp); 1106 1107 /* Assign default values if they are unknown. */ 1108 KASSERT(uid != VNOVAL || gid != VNOVAL); 1109 if (uid == VNOVAL) 1110 uid = node->tn_uid; 1111 if (gid == VNOVAL) 1112 gid = node->tn_gid; 1113 KASSERT(uid != VNOVAL && gid != VNOVAL); 1114 1115 /* Disallow this operation if the file system is mounted read-only. */ 1116 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1117 return EROFS; 1118 1119 /* Immutable or append-only files cannot be modified, either. */ 1120 if (node->tn_flags & (IMMUTABLE | APPEND)) 1121 return EPERM; 1122 1123 /* XXX: The following comes from UFS code, and can be found in 1124 * several other file systems. Shouldn't this be centralized 1125 * somewhere? */ 1126 if ((kauth_cred_geteuid(cred) != node->tn_uid || uid != node->tn_uid || 1127 (gid != node->tn_gid && !(kauth_cred_getegid(cred) == node->tn_gid || 1128 (kauth_cred_ismember_gid(cred, gid, &ismember) == 0 && ismember)))) && 1129 ((error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 1130 NULL)) != 0)) 1131 return error; 1132 1133 node->tn_uid = uid; 1134 node->tn_gid = gid; 1135 1136 node->tn_status |= TMPFS_NODE_CHANGED; 1137 VN_KNOTE(vp, NOTE_ATTRIB); 1138 1139 KASSERT(VOP_ISLOCKED(vp)); 1140 1141 return 0; 1142 } 1143 1144 /* --------------------------------------------------------------------- */ 1145 1146 /* 1147 * Change size of the given vnode. 1148 * Caller should execute tmpfs_update on vp after a successful execution. 1149 * The vnode must be locked on entry and remain locked on exit. 1150 */ 1151 int 1152 tmpfs_chsize(struct vnode *vp, u_quad_t size, kauth_cred_t cred, 1153 struct lwp *l) 1154 { 1155 int error; 1156 struct tmpfs_node *node; 1157 1158 KASSERT(VOP_ISLOCKED(vp)); 1159 1160 node = VP_TO_TMPFS_NODE(vp); 1161 1162 /* Decide whether this is a valid operation based on the file type. */ 1163 error = 0; 1164 switch (vp->v_type) { 1165 case VDIR: 1166 return EISDIR; 1167 1168 case VREG: 1169 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1170 return EROFS; 1171 break; 1172 1173 case VBLK: 1174 /* FALLTHROUGH */ 1175 case VCHR: 1176 /* FALLTHROUGH */ 1177 case VFIFO: 1178 /* Allow modifications of special files even if in the file 1179 * system is mounted read-only (we are not modifying the 1180 * files themselves, but the objects they represent). */ 1181 return 0; 1182 1183 default: 1184 /* Anything else is unsupported. */ 1185 return EOPNOTSUPP; 1186 } 1187 1188 /* Immutable or append-only files cannot be modified, either. */ 1189 if (node->tn_flags & (IMMUTABLE | APPEND)) 1190 return EPERM; 1191 1192 error = tmpfs_truncate(vp, size); 1193 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1194 * for us, as will update tn_status; no need to do that here. */ 1195 1196 KASSERT(VOP_ISLOCKED(vp)); 1197 1198 return error; 1199 } 1200 1201 /* --------------------------------------------------------------------- */ 1202 1203 /* 1204 * Change access and modification times of the given vnode. 1205 * Caller should execute tmpfs_update on vp after a successful execution. 1206 * The vnode must be locked on entry and remain locked on exit. 1207 */ 1208 int 1209 tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime, 1210 int vaflags, kauth_cred_t cred, struct lwp *l) 1211 { 1212 int error; 1213 struct tmpfs_node *node; 1214 1215 KASSERT(VOP_ISLOCKED(vp)); 1216 1217 node = VP_TO_TMPFS_NODE(vp); 1218 1219 /* Disallow this operation if the file system is mounted read-only. */ 1220 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1221 return EROFS; 1222 1223 /* Immutable or append-only files cannot be modified, either. */ 1224 if (node->tn_flags & (IMMUTABLE | APPEND)) 1225 return EPERM; 1226 1227 /* XXX: The following comes from UFS code, and can be found in 1228 * several other file systems. Shouldn't this be centralized 1229 * somewhere? */ 1230 if (kauth_cred_geteuid(cred) != node->tn_uid && 1231 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 1232 NULL)) && ((vaflags & VA_UTIMES_NULL) == 0 || 1233 (error = VOP_ACCESS(vp, VWRITE, cred, l)))) 1234 return error; 1235 1236 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL) 1237 node->tn_status |= TMPFS_NODE_ACCESSED; 1238 1239 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL) 1240 node->tn_status |= TMPFS_NODE_MODIFIED; 1241 1242 tmpfs_update(vp, atime, mtime, 0); 1243 VN_KNOTE(vp, NOTE_ATTRIB); 1244 1245 KASSERT(VOP_ISLOCKED(vp)); 1246 1247 return 0; 1248 } 1249 1250 /* --------------------------------------------------------------------- */ 1251 1252 /* Sync timestamps */ 1253 void 1254 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1255 const struct timespec *mod) 1256 { 1257 struct timespec now; 1258 struct tmpfs_node *node; 1259 1260 node = VP_TO_TMPFS_NODE(vp); 1261 1262 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1263 TMPFS_NODE_CHANGED)) == 0) 1264 return; 1265 1266 getnanotime(&now); 1267 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1268 if (acc == NULL) 1269 acc = &now; 1270 node->tn_atime = *acc; 1271 } 1272 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1273 if (mod == NULL) 1274 mod = &now; 1275 node->tn_mtime = *mod; 1276 } 1277 if (node->tn_status & TMPFS_NODE_CHANGED) 1278 node->tn_ctime = now; 1279 1280 node->tn_status &= 1281 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED); 1282 } 1283 1284 /* --------------------------------------------------------------------- */ 1285 1286 void 1287 tmpfs_update(struct vnode *vp, const struct timespec *acc, 1288 const struct timespec *mod, int flags) 1289 { 1290 1291 struct tmpfs_node *node; 1292 1293 KASSERT(VOP_ISLOCKED(vp)); 1294 1295 node = VP_TO_TMPFS_NODE(vp); 1296 1297 #if 0 1298 if (flags & UPDATE_CLOSE) 1299 ; /* XXX Need to do anything special? */ 1300 #endif 1301 1302 tmpfs_itimes(vp, acc, mod); 1303 1304 KASSERT(VOP_ISLOCKED(vp)); 1305 } 1306 1307 /* --------------------------------------------------------------------- */ 1308 1309 int 1310 tmpfs_truncate(struct vnode *vp, off_t length) 1311 { 1312 bool extended; 1313 int error; 1314 struct tmpfs_node *node; 1315 1316 node = VP_TO_TMPFS_NODE(vp); 1317 extended = length > node->tn_size; 1318 1319 if (length < 0) { 1320 error = EINVAL; 1321 goto out; 1322 } 1323 1324 if (node->tn_size == length) { 1325 error = 0; 1326 goto out; 1327 } 1328 1329 error = tmpfs_reg_resize(vp, length); 1330 if (error == 0) 1331 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1332 1333 out: 1334 tmpfs_update(vp, NULL, NULL, 0); 1335 1336 return error; 1337 } 1338
Indexes created Sun Sep 21 20:09:37 GMT 2025