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/sysctl.h> 46 #include <sys/vnode.h> 47 #include <sys/vmmeter.h> 48 49 #include <vm/vm.h> 50 #include <vm/vm_object.h> 51 #include <vm/vm_page.h> 52 #include <vm/vm_pageout.h> 53 #include <vm/vm_pager.h> 54 #include <vm/vm_extern.h> 55 56 #include <fs/tmpfs/tmpfs.h> 57 #include <fs/tmpfs/tmpfs_fifoops.h> 58 #include <fs/tmpfs/tmpfs_vnops.h> 59 60 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system"); 61 62 static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED; 63 64 static int 65 sysctl_mem_reserved(SYSCTL_HANDLER_ARGS) 66 { 67 int error; 68 long pages, bytes; 69 70 pages = *(long *)arg1; 71 bytes = pages * PAGE_SIZE; 72 73 error = sysctl_handle_long(oidp, &bytes, 0, req); 74 if (error || !req->newptr) 75 return (error); 76 77 pages = bytes / PAGE_SIZE; 78 if (pages < TMPFS_PAGES_MINRESERVED) 79 return (EINVAL); 80 81 *(long *)arg1 = pages; 82 return (0); 83 } 84 85 SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW, 86 &tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L", 87 "Amount of available memory and swap below which tmpfs growth stops"); 88 89 size_t 90 tmpfs_mem_avail(void) 91 { 92 vm_ooffset_t avail; 93 94 avail = swap_pager_avail + cnt.v_free_count + cnt.v_cache_count - 95 tmpfs_pages_reserved; 96 if (__predict_false(avail < 0)) 97 avail = 0; 98 return (avail); 99 } 100 101 size_t 102 tmpfs_pages_used(struct tmpfs_mount *tmp) 103 { 104 const size_t node_size = sizeof(struct tmpfs_node) + 105 sizeof(struct tmpfs_dirent); 106 size_t meta_pages; 107 108 meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size, 109 PAGE_SIZE); 110 return (meta_pages + tmp->tm_pages_used); 111 } 112 113 static size_t 114 tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages) 115 { 116 if (tmpfs_mem_avail() < req_pages) 117 return (0); 118 119 if (tmp->tm_pages_max != SIZE_MAX && 120 tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp)) 121 return (0); 122 123 return (1); 124 } 125 126 /* --------------------------------------------------------------------- */ 127 128 /* 129 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 130 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 131 * using the credentials of the process 'p'. 132 * 133 * If the node type is set to 'VDIR', then the parent parameter must point 134 * to the parent directory of the node being created. It may only be NULL 135 * while allocating the root node. 136 * 137 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 138 * specifies the device the node represents. 139 * 140 * If the node type is set to 'VLNK', then the parameter target specifies 141 * the file name of the target file for the symbolic link that is being 142 * created. 143 * 144 * Note that new nodes are retrieved from the available list if it has 145 * items or, if it is empty, from the node pool as long as there is enough 146 * space to create them. 147 * 148 * Returns zero on success or an appropriate error code on failure. 149 */ 150 int 151 tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type, 152 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent, 153 char *target, dev_t rdev, struct tmpfs_node **node) 154 { 155 struct tmpfs_node *nnode; 156 157 /* If the root directory of the 'tmp' file system is not yet 158 * allocated, this must be the request to do it. */ 159 MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR)); 160 161 MPASS(IFF(type == VLNK, target != NULL)); 162 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL)); 163 164 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max) 165 return (ENOSPC); 166 if (tmpfs_pages_check_avail(tmp, 1) == 0) 167 return (ENOSPC); 168 169 nnode = (struct tmpfs_node *)uma_zalloc_arg( 170 tmp->tm_node_pool, tmp, M_WAITOK); 171 172 /* Generic initialization. */ 173 nnode->tn_type = type; 174 vfs_timestamp(&nnode->tn_atime); 175 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime = 176 nnode->tn_atime; 177 nnode->tn_uid = uid; 178 nnode->tn_gid = gid; 179 nnode->tn_mode = mode; 180 nnode->tn_id = alloc_unr(tmp->tm_ino_unr); 181 182 /* Type-specific initialization. */ 183 switch (nnode->tn_type) { 184 case VBLK: 185 case VCHR: 186 nnode->tn_rdev = rdev; 187 break; 188 189 case VDIR: 190 TAILQ_INIT(&nnode->tn_dir.tn_dirhead); 191 MPASS(parent != nnode); 192 MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL)); 193 nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent; 194 nnode->tn_dir.tn_readdir_lastn = 0; 195 nnode->tn_dir.tn_readdir_lastp = NULL; 196 nnode->tn_links++; 197 TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent); 198 nnode->tn_dir.tn_parent->tn_links++; 199 TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent); 200 break; 201 202 case VFIFO: 203 /* FALLTHROUGH */ 204 case VSOCK: 205 break; 206 207 case VLNK: 208 MPASS(strlen(target) < MAXPATHLEN); 209 nnode->tn_size = strlen(target); 210 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME, 211 M_WAITOK); 212 memcpy(nnode->tn_link, target, nnode->tn_size); 213 break; 214 215 case VREG: 216 nnode->tn_reg.tn_aobj = 217 vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0, 218 NULL /* XXXKIB - tmpfs needs swap reservation */); 219 break; 220 221 default: 222 panic("tmpfs_alloc_node: type %p %d", nnode, (int)nnode->tn_type); 223 } 224 225 TMPFS_LOCK(tmp); 226 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 227 tmp->tm_nodes_inuse++; 228 TMPFS_UNLOCK(tmp); 229 230 *node = nnode; 231 return 0; 232 } 233 234 /* --------------------------------------------------------------------- */ 235 236 /* 237 * Destroys the node pointed to by node from the file system 'tmp'. 238 * If the node does not belong to the given mount point, the results are 239 * unpredicted. 240 * 241 * If the node references a directory; no entries are allowed because 242 * their removal could need a recursive algorithm, something forbidden in 243 * kernel space. Furthermore, there is not need to provide such 244 * functionality (recursive removal) because the only primitives offered 245 * to the user are the removal of empty directories and the deletion of 246 * individual files. 247 * 248 * Note that nodes are not really deleted; in fact, when a node has been 249 * allocated, it cannot be deleted during the whole life of the file 250 * system. Instead, they are moved to the available list and remain there 251 * until reused. 252 */ 253 void 254 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 255 { 256 vm_object_t uobj; 257 258 #ifdef INVARIANTS 259 TMPFS_NODE_LOCK(node); 260 MPASS(node->tn_vnode == NULL); 261 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0); 262 TMPFS_NODE_UNLOCK(node); 263 #endif 264 265 TMPFS_LOCK(tmp); 266 LIST_REMOVE(node, tn_entries); 267 tmp->tm_nodes_inuse--; 268 TMPFS_UNLOCK(tmp); 269 270 switch (node->tn_type) { 271 case VNON: 272 /* Do not do anything. VNON is provided to let the 273 * allocation routine clean itself easily by avoiding 274 * duplicating code in it. */ 275 /* FALLTHROUGH */ 276 case VBLK: 277 /* FALLTHROUGH */ 278 case VCHR: 279 /* FALLTHROUGH */ 280 case VDIR: 281 /* FALLTHROUGH */ 282 case VFIFO: 283 /* FALLTHROUGH */ 284 case VSOCK: 285 break; 286 287 case VLNK: 288 free(node->tn_link, M_TMPFSNAME); 289 break; 290 291 case VREG: 292 uobj = node->tn_reg.tn_aobj; 293 if (uobj != NULL) { 294 TMPFS_LOCK(tmp); 295 tmp->tm_pages_used -= uobj->size; 296 TMPFS_UNLOCK(tmp); 297 vm_object_deallocate(uobj); 298 } 299 break; 300 301 default: 302 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type); 303 } 304 305 free_unr(tmp->tm_ino_unr, node->tn_id); 306 uma_zfree(tmp->tm_node_pool, node); 307 } 308 309 /* --------------------------------------------------------------------- */ 310 311 /* 312 * Allocates a new directory entry for the node node with a name of name. 313 * The new directory entry is returned in *de. 314 * 315 * The link count of node is increased by one to reflect the new object 316 * referencing it. 317 * 318 * Returns zero on success or an appropriate error code on failure. 319 */ 320 int 321 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 322 const char *name, uint16_t len, struct tmpfs_dirent **de) 323 { 324 struct tmpfs_dirent *nde; 325 326 nde = (struct tmpfs_dirent *)uma_zalloc( 327 tmp->tm_dirent_pool, M_WAITOK); 328 nde->td_name = malloc(len, M_TMPFSNAME, M_WAITOK); 329 nde->td_namelen = len; 330 memcpy(nde->td_name, name, len); 331 332 nde->td_node = node; 333 if (node != NULL) 334 node->tn_links++; 335 336 *de = nde; 337 338 return 0; 339 } 340 341 /* --------------------------------------------------------------------- */ 342 343 /* 344 * Frees a directory entry. It is the caller's responsibility to destroy 345 * the node referenced by it if needed. 346 * 347 * The link count of node is decreased by one to reflect the removal of an 348 * object that referenced it. This only happens if 'node_exists' is true; 349 * otherwise the function will not access the node referred to by the 350 * directory entry, as it may already have been released from the outside. 351 */ 352 void 353 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de, 354 boolean_t node_exists) 355 { 356 if (node_exists) { 357 struct tmpfs_node *node; 358 359 node = de->td_node; 360 if (node != NULL) { 361 MPASS(node->tn_links > 0); 362 node->tn_links--; 363 } 364 } 365 366 free(de->td_name, M_TMPFSNAME); 367 uma_zfree(tmp->tm_dirent_pool, de); 368 } 369 370 /* --------------------------------------------------------------------- */ 371 372 /* 373 * Allocates a new vnode for the node node or returns a new reference to 374 * an existing one if the node had already a vnode referencing it. The 375 * resulting locked vnode is returned in *vpp. 376 * 377 * Returns zero on success or an appropriate error code on failure. 378 */ 379 int 380 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag, 381 struct vnode **vpp) 382 { 383 int error = 0; 384 struct vnode *vp; 385 386 loop: 387 TMPFS_NODE_LOCK(node); 388 if ((vp = node->tn_vnode) != NULL) { 389 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0); 390 VI_LOCK(vp); 391 TMPFS_NODE_UNLOCK(node); 392 error = vget(vp, lkflag | LK_INTERLOCK, curthread); 393 if (error != 0) { 394 vp = NULL; 395 goto out; 396 } 397 398 /* 399 * Make sure the vnode is still there after 400 * getting the interlock to avoid racing a free. 401 */ 402 if (node->tn_vnode == NULL || node->tn_vnode != vp) { 403 vput(vp); 404 goto loop; 405 } 406 407 goto out; 408 } 409 410 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) || 411 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) { 412 TMPFS_NODE_UNLOCK(node); 413 error = ENOENT; 414 vp = NULL; 415 goto out; 416 } 417 418 /* 419 * otherwise lock the vp list while we call getnewvnode 420 * since that can block. 421 */ 422 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) { 423 node->tn_vpstate |= TMPFS_VNODE_WANT; 424 error = msleep((caddr_t) &node->tn_vpstate, 425 TMPFS_NODE_MTX(node), PDROP | PCATCH, 426 "tmpfs_alloc_vp", 0); 427 if (error) 428 return error; 429 430 goto loop; 431 } else 432 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING; 433 434 TMPFS_NODE_UNLOCK(node); 435 436 /* Get a new vnode and associate it with our node. */ 437 error = getnewvnode("tmpfs", mp, &tmpfs_vnodeop_entries, &vp); 438 if (error != 0) 439 goto unlock; 440 MPASS(vp != NULL); 441 442 (void) vn_lock(vp, lkflag | LK_RETRY); 443 444 vp->v_data = node; 445 vp->v_type = node->tn_type; 446 447 /* Type-specific initialization. */ 448 switch (node->tn_type) { 449 case VBLK: 450 /* FALLTHROUGH */ 451 case VCHR: 452 /* FALLTHROUGH */ 453 case VLNK: 454 /* FALLTHROUGH */ 455 case VREG: 456 /* FALLTHROUGH */ 457 case VSOCK: 458 break; 459 case VFIFO: 460 vp->v_op = &tmpfs_fifoop_entries; 461 break; 462 case VDIR: 463 MPASS(node->tn_dir.tn_parent != NULL); 464 if (node->tn_dir.tn_parent == node) 465 vp->v_vflag |= VV_ROOT; 466 break; 467 468 default: 469 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 470 } 471 472 vnode_pager_setsize(vp, node->tn_size); 473 error = insmntque(vp, mp); 474 if (error) 475 vp = NULL; 476 477 unlock: 478 TMPFS_NODE_LOCK(node); 479 480 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING); 481 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING; 482 node->tn_vnode = vp; 483 484 if (node->tn_vpstate & TMPFS_VNODE_WANT) { 485 node->tn_vpstate &= ~TMPFS_VNODE_WANT; 486 TMPFS_NODE_UNLOCK(node); 487 wakeup((caddr_t) &node->tn_vpstate); 488 } else 489 TMPFS_NODE_UNLOCK(node); 490 491 out: 492 *vpp = vp; 493 494 #ifdef INVARIANTS 495 if (error == 0) { 496 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp)); 497 TMPFS_NODE_LOCK(node); 498 MPASS(*vpp == node->tn_vnode); 499 TMPFS_NODE_UNLOCK(node); 500 } 501 #endif 502 503 return error; 504 } 505 506 /* --------------------------------------------------------------------- */ 507 508 /* 509 * Destroys the association between the vnode vp and the node it 510 * references. 511 */ 512 void 513 tmpfs_free_vp(struct vnode *vp) 514 { 515 struct tmpfs_node *node; 516 517 node = VP_TO_TMPFS_NODE(vp); 518 519 mtx_assert(TMPFS_NODE_MTX(node), MA_OWNED); 520 node->tn_vnode = NULL; 521 vp->v_data = NULL; 522 } 523 524 /* --------------------------------------------------------------------- */ 525 526 /* 527 * Allocates a new file of type 'type' and adds it to the parent directory 528 * 'dvp'; this addition is done using the component name given in 'cnp'. 529 * The ownership of the new file is automatically assigned based on the 530 * credentials of the caller (through 'cnp'), the group is set based on 531 * the parent directory and the mode is determined from the 'vap' argument. 532 * If successful, *vpp holds a vnode to the newly created file and zero 533 * is returned. Otherwise *vpp is NULL and the function returns an 534 * appropriate error code. 535 */ 536 int 537 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 538 struct componentname *cnp, char *target) 539 { 540 int error; 541 struct tmpfs_dirent *de; 542 struct tmpfs_mount *tmp; 543 struct tmpfs_node *dnode; 544 struct tmpfs_node *node; 545 struct tmpfs_node *parent; 546 547 MPASS(VOP_ISLOCKED(dvp)); 548 MPASS(cnp->cn_flags & HASBUF); 549 550 tmp = VFS_TO_TMPFS(dvp->v_mount); 551 dnode = VP_TO_TMPFS_DIR(dvp); 552 *vpp = NULL; 553 554 /* If the entry we are creating is a directory, we cannot overflow 555 * the number of links of its parent, because it will get a new 556 * link. */ 557 if (vap->va_type == VDIR) { 558 /* Ensure that we do not overflow the maximum number of links 559 * imposed by the system. */ 560 MPASS(dnode->tn_links <= LINK_MAX); 561 if (dnode->tn_links == LINK_MAX) { 562 error = EMLINK; 563 goto out; 564 } 565 566 parent = dnode; 567 MPASS(parent != NULL); 568 } else 569 parent = NULL; 570 571 /* Allocate a node that represents the new file. */ 572 error = tmpfs_alloc_node(tmp, vap->va_type, cnp->cn_cred->cr_uid, 573 dnode->tn_gid, vap->va_mode, parent, target, vap->va_rdev, &node); 574 if (error != 0) 575 goto out; 576 577 /* Allocate a directory entry that points to the new file. */ 578 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen, 579 &de); 580 if (error != 0) { 581 tmpfs_free_node(tmp, node); 582 goto out; 583 } 584 585 /* Allocate a vnode for the new file. */ 586 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp); 587 if (error != 0) { 588 tmpfs_free_dirent(tmp, de, TRUE); 589 tmpfs_free_node(tmp, node); 590 goto out; 591 } 592 593 /* Now that all required items are allocated, we can proceed to 594 * insert the new node into the directory, an operation that 595 * cannot fail. */ 596 if (cnp->cn_flags & ISWHITEOUT) 597 tmpfs_dir_whiteout_remove(dvp, cnp); 598 tmpfs_dir_attach(dvp, de); 599 600 out: 601 602 return error; 603 } 604 605 /* --------------------------------------------------------------------- */ 606 607 /* 608 * Attaches the directory entry de to the directory represented by vp. 609 * Note that this does not change the link count of the node pointed by 610 * the directory entry, as this is done by tmpfs_alloc_dirent. 611 */ 612 void 613 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de) 614 { 615 struct tmpfs_node *dnode; 616 617 ASSERT_VOP_ELOCKED(vp, __func__); 618 dnode = VP_TO_TMPFS_DIR(vp); 619 TAILQ_INSERT_TAIL(&dnode->tn_dir.tn_dirhead, de, td_entries); 620 dnode->tn_size += sizeof(struct tmpfs_dirent); 621 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 622 TMPFS_NODE_MODIFIED; 623 } 624 625 /* --------------------------------------------------------------------- */ 626 627 /* 628 * Detaches the directory entry de from the directory represented by vp. 629 * Note that this does not change the link count of the node pointed by 630 * the directory entry, as this is done by tmpfs_free_dirent. 631 */ 632 void 633 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de) 634 { 635 struct tmpfs_node *dnode; 636 637 ASSERT_VOP_ELOCKED(vp, __func__); 638 dnode = VP_TO_TMPFS_DIR(vp); 639 640 if (dnode->tn_dir.tn_readdir_lastp == de) { 641 dnode->tn_dir.tn_readdir_lastn = 0; 642 dnode->tn_dir.tn_readdir_lastp = NULL; 643 } 644 645 TAILQ_REMOVE(&dnode->tn_dir.tn_dirhead, de, td_entries); 646 dnode->tn_size -= sizeof(struct tmpfs_dirent); 647 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 648 TMPFS_NODE_MODIFIED; 649 } 650 651 /* --------------------------------------------------------------------- */ 652 653 /* 654 * Looks for a directory entry in the directory represented by node. 655 * 'cnp' describes the name of the entry to look for. Note that the . 656 * and .. components are not allowed as they do not physically exist 657 * within directories. 658 * 659 * Returns a pointer to the entry when found, otherwise NULL. 660 */ 661 struct tmpfs_dirent * 662 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 663 struct componentname *cnp) 664 { 665 boolean_t found; 666 struct tmpfs_dirent *de; 667 668 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.')); 669 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' && 670 cnp->cn_nameptr[1] == '.'))); 671 TMPFS_VALIDATE_DIR(node); 672 673 found = 0; 674 TAILQ_FOREACH(de, &node->tn_dir.tn_dirhead, td_entries) { 675 if (f != NULL && de->td_node != f) 676 continue; 677 MPASS(cnp->cn_namelen < 0xffff); 678 if (de->td_namelen == (uint16_t)cnp->cn_namelen && 679 bcmp(de->td_name, cnp->cn_nameptr, de->td_namelen) == 0) { 680 found = 1; 681 break; 682 } 683 } 684 node->tn_status |= TMPFS_NODE_ACCESSED; 685 686 return found ? de : NULL; 687 } 688 689 /* --------------------------------------------------------------------- */ 690 691 /* 692 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 693 * directory and returns it in the uio space. The function returns 0 694 * on success, -1 if there was not enough space in the uio structure to 695 * hold the directory entry or an appropriate error code if another 696 * error happens. 697 */ 698 int 699 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 700 { 701 int error; 702 struct dirent dent; 703 704 TMPFS_VALIDATE_DIR(node); 705 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 706 707 dent.d_fileno = node->tn_id; 708 dent.d_type = DT_DIR; 709 dent.d_namlen = 1; 710 dent.d_name[0] = '.'; 711 dent.d_name[1] = '\0'; 712 dent.d_reclen = GENERIC_DIRSIZ(&dent); 713 714 if (dent.d_reclen > uio->uio_resid) 715 error = -1; 716 else { 717 error = uiomove(&dent, dent.d_reclen, uio); 718 if (error == 0) 719 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 720 } 721 722 node->tn_status |= TMPFS_NODE_ACCESSED; 723 724 return error; 725 } 726 727 /* --------------------------------------------------------------------- */ 728 729 /* 730 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 731 * directory and returns it in the uio space. The function returns 0 732 * on success, -1 if there was not enough space in the uio structure to 733 * hold the directory entry or an appropriate error code if another 734 * error happens. 735 */ 736 int 737 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio) 738 { 739 int error; 740 struct dirent dent; 741 742 TMPFS_VALIDATE_DIR(node); 743 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 744 745 /* 746 * Return ENOENT if the current node is already removed. 747 */ 748 TMPFS_ASSERT_LOCKED(node); 749 if (node->tn_dir.tn_parent == NULL) { 750 return (ENOENT); 751 } 752 753 TMPFS_NODE_LOCK(node->tn_dir.tn_parent); 754 dent.d_fileno = node->tn_dir.tn_parent->tn_id; 755 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent); 756 757 dent.d_type = DT_DIR; 758 dent.d_namlen = 2; 759 dent.d_name[0] = '.'; 760 dent.d_name[1] = '.'; 761 dent.d_name[2] = '\0'; 762 dent.d_reclen = GENERIC_DIRSIZ(&dent); 763 764 if (dent.d_reclen > uio->uio_resid) 765 error = -1; 766 else { 767 error = uiomove(&dent, dent.d_reclen, uio); 768 if (error == 0) { 769 struct tmpfs_dirent *de; 770 771 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 772 if (de == NULL) 773 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 774 else 775 uio->uio_offset = tmpfs_dircookie(de); 776 } 777 } 778 779 node->tn_status |= TMPFS_NODE_ACCESSED; 780 781 return error; 782 } 783 784 /* --------------------------------------------------------------------- */ 785 786 /* 787 * Lookup a directory entry by its associated cookie. 788 */ 789 struct tmpfs_dirent * 790 tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie) 791 { 792 struct tmpfs_dirent *de; 793 794 if (cookie == node->tn_dir.tn_readdir_lastn && 795 node->tn_dir.tn_readdir_lastp != NULL) { 796 return node->tn_dir.tn_readdir_lastp; 797 } 798 799 TAILQ_FOREACH(de, &node->tn_dir.tn_dirhead, td_entries) { 800 if (tmpfs_dircookie(de) == cookie) { 801 break; 802 } 803 } 804 805 return de; 806 } 807 808 /* --------------------------------------------------------------------- */ 809 810 /* 811 * Helper function for tmpfs_readdir. Returns as much directory entries 812 * as can fit in the uio space. The read starts at uio->uio_offset. 813 * The function returns 0 on success, -1 if there was not enough space 814 * in the uio structure to hold the directory entry or an appropriate 815 * error code if another error happens. 816 */ 817 int 818 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp) 819 { 820 int error; 821 off_t startcookie; 822 struct tmpfs_dirent *de; 823 824 TMPFS_VALIDATE_DIR(node); 825 826 /* Locate the first directory entry we have to return. We have cached 827 * the last readdir in the node, so use those values if appropriate. 828 * Otherwise do a linear scan to find the requested entry. */ 829 startcookie = uio->uio_offset; 830 MPASS(startcookie != TMPFS_DIRCOOKIE_DOT); 831 MPASS(startcookie != TMPFS_DIRCOOKIE_DOTDOT); 832 if (startcookie == TMPFS_DIRCOOKIE_EOF) { 833 return 0; 834 } else { 835 de = tmpfs_dir_lookupbycookie(node, startcookie); 836 } 837 if (de == NULL) { 838 return EINVAL; 839 } 840 841 /* Read as much entries as possible; i.e., until we reach the end of 842 * the directory or we exhaust uio space. */ 843 do { 844 struct dirent d; 845 846 /* Create a dirent structure representing the current 847 * tmpfs_node and fill it. */ 848 if (de->td_node == NULL) { 849 d.d_fileno = 1; 850 d.d_type = DT_WHT; 851 } else { 852 d.d_fileno = de->td_node->tn_id; 853 switch (de->td_node->tn_type) { 854 case VBLK: 855 d.d_type = DT_BLK; 856 break; 857 858 case VCHR: 859 d.d_type = DT_CHR; 860 break; 861 862 case VDIR: 863 d.d_type = DT_DIR; 864 break; 865 866 case VFIFO: 867 d.d_type = DT_FIFO; 868 break; 869 870 case VLNK: 871 d.d_type = DT_LNK; 872 break; 873 874 case VREG: 875 d.d_type = DT_REG; 876 break; 877 878 case VSOCK: 879 d.d_type = DT_SOCK; 880 break; 881 882 default: 883 panic("tmpfs_dir_getdents: type %p %d", 884 de->td_node, (int)de->td_node->tn_type); 885 } 886 } 887 d.d_namlen = de->td_namelen; 888 MPASS(de->td_namelen < sizeof(d.d_name)); 889 (void)memcpy(d.d_name, de->td_name, de->td_namelen); 890 d.d_name[de->td_namelen] = '\0'; 891 d.d_reclen = GENERIC_DIRSIZ(&d); 892 893 /* Stop reading if the directory entry we are treating is 894 * bigger than the amount of data that can be returned. */ 895 if (d.d_reclen > uio->uio_resid) { 896 error = -1; 897 break; 898 } 899 900 /* Copy the new dirent structure into the output buffer and 901 * advance pointers. */ 902 error = uiomove(&d, d.d_reclen, uio); 903 if (error == 0) { 904 (*cntp)++; 905 de = TAILQ_NEXT(de, td_entries); 906 } 907 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 908 909 /* Update the offset and cache. */ 910 if (de == NULL) { 911 uio->uio_offset = TMPFS_DIRCOOKIE_EOF; 912 node->tn_dir.tn_readdir_lastn = 0; 913 node->tn_dir.tn_readdir_lastp = NULL; 914 } else { 915 node->tn_dir.tn_readdir_lastn = uio->uio_offset = tmpfs_dircookie(de); 916 node->tn_dir.tn_readdir_lastp = de; 917 } 918 919 node->tn_status |= TMPFS_NODE_ACCESSED; 920 return error; 921 } 922 923 int 924 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp) 925 { 926 struct tmpfs_dirent *de; 927 int error; 928 929 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL, 930 cnp->cn_nameptr, cnp->cn_namelen, &de); 931 if (error != 0) 932 return (error); 933 tmpfs_dir_attach(dvp, de); 934 return (0); 935 } 936 937 void 938 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp) 939 { 940 struct tmpfs_dirent *de; 941 942 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 943 MPASS(de != NULL && de->td_node == NULL); 944 tmpfs_dir_detach(dvp, de); 945 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de, TRUE); 946 } 947 948 /* --------------------------------------------------------------------- */ 949 950 /* 951 * Resizes the aobj associated with the regular file pointed to by 'vp' to the 952 * size 'newsize'. 'vp' must point to a vnode that represents a regular file. 953 * 'newsize' must be positive. 954 * 955 * Returns zero on success or an appropriate error code on failure. 956 */ 957 int 958 tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr) 959 { 960 struct tmpfs_mount *tmp; 961 struct tmpfs_node *node; 962 vm_object_t uobj; 963 vm_page_t m, ma[1]; 964 vm_pindex_t idx, newpages, oldpages; 965 off_t oldsize; 966 int base, rv; 967 968 MPASS(vp->v_type == VREG); 969 MPASS(newsize >= 0); 970 971 node = VP_TO_TMPFS_NODE(vp); 972 uobj = node->tn_reg.tn_aobj; 973 tmp = VFS_TO_TMPFS(vp->v_mount); 974 975 /* 976 * Convert the old and new sizes to the number of pages needed to 977 * store them. It may happen that we do not need to do anything 978 * because the last allocated page can accommodate the change on 979 * its own. 980 */ 981 oldsize = node->tn_size; 982 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK); 983 MPASS(oldpages == uobj->size); 984 newpages = OFF_TO_IDX(newsize + PAGE_MASK); 985 if (newpages > oldpages && 986 tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0) 987 return (ENOSPC); 988 989 VM_OBJECT_LOCK(uobj); 990 if (newsize < oldsize) { 991 /* 992 * Zero the truncated part of the last page. 993 */ 994 base = newsize & PAGE_MASK; 995 if (base != 0) { 996 idx = OFF_TO_IDX(newsize); 997 retry: 998 m = vm_page_lookup(uobj, idx); 999 if (m != NULL) { 1000 if ((m->oflags & VPO_BUSY) != 0 || 1001 m->busy != 0) { 1002 vm_page_sleep(m, "tmfssz"); 1003 goto retry; 1004 } 1005 MPASS(m->valid == VM_PAGE_BITS_ALL); 1006 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) { 1007 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL); 1008 if (m == NULL) { 1009 VM_OBJECT_UNLOCK(uobj); 1010 VM_WAIT; 1011 VM_OBJECT_LOCK(uobj); 1012 goto retry; 1013 } else if (m->valid != VM_PAGE_BITS_ALL) { 1014 ma[0] = m; 1015 rv = vm_pager_get_pages(uobj, ma, 1, 0); 1016 m = vm_page_lookup(uobj, idx); 1017 } else 1018 /* A cached page was reactivated. */ 1019 rv = VM_PAGER_OK; 1020 vm_page_lock(m); 1021 if (rv == VM_PAGER_OK) { 1022 vm_page_deactivate(m); 1023 vm_page_unlock(m); 1024 vm_page_wakeup(m); 1025 } else { 1026 vm_page_free(m); 1027 vm_page_unlock(m); 1028 if (ignerr) 1029 m = NULL; 1030 else { 1031 VM_OBJECT_UNLOCK(uobj); 1032 return (EIO); 1033 } 1034 } 1035 } 1036 if (m != NULL) { 1037 pmap_zero_page_area(m, base, PAGE_SIZE - base); 1038 vm_page_dirty(m); 1039 vm_pager_page_unswapped(m); 1040 } 1041 } 1042 1043 /* 1044 * Release any swap space and free any whole pages. 1045 */ 1046 if (newpages < oldpages) { 1047 swap_pager_freespace(uobj, newpages, oldpages - 1048 newpages); 1049 vm_object_page_remove(uobj, newpages, 0, 0); 1050 } 1051 } 1052 uobj->size = newpages; 1053 VM_OBJECT_UNLOCK(uobj); 1054 1055 TMPFS_LOCK(tmp); 1056 tmp->tm_pages_used += (newpages - oldpages); 1057 TMPFS_UNLOCK(tmp); 1058 1059 node->tn_size = newsize; 1060 vnode_pager_setsize(vp, newsize); 1061 return (0); 1062 } 1063 1064 /* --------------------------------------------------------------------- */ 1065 1066 /* 1067 * Change flags of the given vnode. 1068 * Caller should execute tmpfs_update on vp after a successful execution. 1069 * The vnode must be locked on entry and remain locked on exit. 1070 */ 1071 int 1072 tmpfs_chflags(struct vnode *vp, int flags, struct ucred *cred, struct thread *p) 1073 { 1074 int error; 1075 struct tmpfs_node *node; 1076 1077 MPASS(VOP_ISLOCKED(vp)); 1078 1079 node = VP_TO_TMPFS_NODE(vp); 1080 1081 if ((flags & ~(UF_NODUMP | UF_IMMUTABLE | UF_APPEND | UF_OPAQUE | 1082 UF_NOUNLINK | SF_ARCHIVED | SF_IMMUTABLE | SF_APPEND | 1083 SF_NOUNLINK)) != 0) 1084 return (EOPNOTSUPP); 1085 1086 /* Disallow this operation if the file system is mounted read-only. */ 1087 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1088 return EROFS; 1089 1090 /* 1091 * Callers may only modify the file flags on objects they 1092 * have VADMIN rights for. 1093 */ 1094 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1095 return (error); 1096 /* 1097 * Unprivileged processes are not permitted to unset system 1098 * flags, or modify flags if any system flags are set. 1099 */ 1100 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 1101 if (node->tn_flags & 1102 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 1103 error = securelevel_gt(cred, 0); 1104 if (error) 1105 return (error); 1106 } 1107 } else { 1108 if (node->tn_flags & 1109 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 1110 ((flags ^ node->tn_flags) & SF_SETTABLE)) 1111 return (EPERM); 1112 } 1113 node->tn_flags = flags; 1114 node->tn_status |= TMPFS_NODE_CHANGED; 1115 1116 MPASS(VOP_ISLOCKED(vp)); 1117 1118 return 0; 1119 } 1120 1121 /* --------------------------------------------------------------------- */ 1122 1123 /* 1124 * Change access mode on the given vnode. 1125 * Caller should execute tmpfs_update on vp after a successful execution. 1126 * The vnode must be locked on entry and remain locked on exit. 1127 */ 1128 int 1129 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p) 1130 { 1131 int error; 1132 struct tmpfs_node *node; 1133 1134 MPASS(VOP_ISLOCKED(vp)); 1135 1136 node = VP_TO_TMPFS_NODE(vp); 1137 1138 /* Disallow this operation if the file system is mounted read-only. */ 1139 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1140 return EROFS; 1141 1142 /* Immutable or append-only files cannot be modified, either. */ 1143 if (node->tn_flags & (IMMUTABLE | APPEND)) 1144 return EPERM; 1145 1146 /* 1147 * To modify the permissions on a file, must possess VADMIN 1148 * for that file. 1149 */ 1150 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1151 return (error); 1152 1153 /* 1154 * Privileged processes may set the sticky bit on non-directories, 1155 * as well as set the setgid bit on a file with a group that the 1156 * process is not a member of. 1157 */ 1158 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 1159 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 1160 return (EFTYPE); 1161 } 1162 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) { 1163 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 1164 if (error) 1165 return (error); 1166 } 1167 1168 1169 node->tn_mode &= ~ALLPERMS; 1170 node->tn_mode |= mode & ALLPERMS; 1171 1172 node->tn_status |= TMPFS_NODE_CHANGED; 1173 1174 MPASS(VOP_ISLOCKED(vp)); 1175 1176 return 0; 1177 } 1178 1179 /* --------------------------------------------------------------------- */ 1180 1181 /* 1182 * Change ownership of the given vnode. At least one of uid or gid must 1183 * be different than VNOVAL. If one is set to that value, the attribute 1184 * is unchanged. 1185 * Caller should execute tmpfs_update on vp after a successful execution. 1186 * The vnode must be locked on entry and remain locked on exit. 1187 */ 1188 int 1189 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 1190 struct thread *p) 1191 { 1192 int error; 1193 struct tmpfs_node *node; 1194 uid_t ouid; 1195 gid_t ogid; 1196 1197 MPASS(VOP_ISLOCKED(vp)); 1198 1199 node = VP_TO_TMPFS_NODE(vp); 1200 1201 /* Assign default values if they are unknown. */ 1202 MPASS(uid != VNOVAL || gid != VNOVAL); 1203 if (uid == VNOVAL) 1204 uid = node->tn_uid; 1205 if (gid == VNOVAL) 1206 gid = node->tn_gid; 1207 MPASS(uid != VNOVAL && gid != VNOVAL); 1208 1209 /* Disallow this operation if the file system is mounted read-only. */ 1210 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1211 return EROFS; 1212 1213 /* Immutable or append-only files cannot be modified, either. */ 1214 if (node->tn_flags & (IMMUTABLE | APPEND)) 1215 return EPERM; 1216 1217 /* 1218 * To modify the ownership of a file, must possess VADMIN for that 1219 * file. 1220 */ 1221 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1222 return (error); 1223 1224 /* 1225 * To change the owner of a file, or change the group of a file to a 1226 * group of which we are not a member, the caller must have 1227 * privilege. 1228 */ 1229 if ((uid != node->tn_uid || 1230 (gid != node->tn_gid && !groupmember(gid, cred))) && 1231 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 1232 return (error); 1233 1234 ogid = node->tn_gid; 1235 ouid = node->tn_uid; 1236 1237 node->tn_uid = uid; 1238 node->tn_gid = gid; 1239 1240 node->tn_status |= TMPFS_NODE_CHANGED; 1241 1242 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) { 1243 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) 1244 node->tn_mode &= ~(S_ISUID | S_ISGID); 1245 } 1246 1247 MPASS(VOP_ISLOCKED(vp)); 1248 1249 return 0; 1250 } 1251 1252 /* --------------------------------------------------------------------- */ 1253 1254 /* 1255 * Change size of the given vnode. 1256 * Caller should execute tmpfs_update on vp after a successful execution. 1257 * The vnode must be locked on entry and remain locked on exit. 1258 */ 1259 int 1260 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred, 1261 struct thread *p) 1262 { 1263 int error; 1264 struct tmpfs_node *node; 1265 1266 MPASS(VOP_ISLOCKED(vp)); 1267 1268 node = VP_TO_TMPFS_NODE(vp); 1269 1270 /* Decide whether this is a valid operation based on the file type. */ 1271 error = 0; 1272 switch (vp->v_type) { 1273 case VDIR: 1274 return EISDIR; 1275 1276 case VREG: 1277 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1278 return EROFS; 1279 break; 1280 1281 case VBLK: 1282 /* FALLTHROUGH */ 1283 case VCHR: 1284 /* FALLTHROUGH */ 1285 case VFIFO: 1286 /* Allow modifications of special files even if in the file 1287 * system is mounted read-only (we are not modifying the 1288 * files themselves, but the objects they represent). */ 1289 return 0; 1290 1291 default: 1292 /* Anything else is unsupported. */ 1293 return EOPNOTSUPP; 1294 } 1295 1296 /* Immutable or append-only files cannot be modified, either. */ 1297 if (node->tn_flags & (IMMUTABLE | APPEND)) 1298 return EPERM; 1299 1300 error = tmpfs_truncate(vp, size); 1301 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1302 * for us, as will update tn_status; no need to do that here. */ 1303 1304 MPASS(VOP_ISLOCKED(vp)); 1305 1306 return error; 1307 } 1308 1309 /* --------------------------------------------------------------------- */ 1310 1311 /* 1312 * Change access and modification times of the given vnode. 1313 * Caller should execute tmpfs_update on vp after a successful execution. 1314 * The vnode must be locked on entry and remain locked on exit. 1315 */ 1316 int 1317 tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime, 1318 struct timespec *birthtime, int vaflags, struct ucred *cred, struct thread *l) 1319 { 1320 int error; 1321 struct tmpfs_node *node; 1322 1323 MPASS(VOP_ISLOCKED(vp)); 1324 1325 node = VP_TO_TMPFS_NODE(vp); 1326 1327 /* Disallow this operation if the file system is mounted read-only. */ 1328 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1329 return EROFS; 1330 1331 /* Immutable or append-only files cannot be modified, either. */ 1332 if (node->tn_flags & (IMMUTABLE | APPEND)) 1333 return EPERM; 1334 1335 /* Determine if the user have proper privilege to update time. */ 1336 if (vaflags & VA_UTIMES_NULL) { 1337 error = VOP_ACCESS(vp, VADMIN, cred, l); 1338 if (error) 1339 error = VOP_ACCESS(vp, VWRITE, cred, l); 1340 } else 1341 error = VOP_ACCESS(vp, VADMIN, cred, l); 1342 if (error) 1343 return (error); 1344 1345 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL) 1346 node->tn_status |= TMPFS_NODE_ACCESSED; 1347 1348 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL) 1349 node->tn_status |= TMPFS_NODE_MODIFIED; 1350 1351 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL) 1352 node->tn_status |= TMPFS_NODE_MODIFIED; 1353 1354 tmpfs_itimes(vp, atime, mtime); 1355 1356 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL) 1357 node->tn_birthtime = *birthtime; 1358 MPASS(VOP_ISLOCKED(vp)); 1359 1360 return 0; 1361 } 1362 1363 /* --------------------------------------------------------------------- */ 1364 /* Sync timestamps */ 1365 void 1366 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1367 const struct timespec *mod) 1368 { 1369 struct tmpfs_node *node; 1370 struct timespec now; 1371 1372 node = VP_TO_TMPFS_NODE(vp); 1373 1374 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1375 TMPFS_NODE_CHANGED)) == 0) 1376 return; 1377 1378 vfs_timestamp(&now); 1379 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1380 if (acc == NULL) 1381 acc = &now; 1382 node->tn_atime = *acc; 1383 } 1384 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1385 if (mod == NULL) 1386 mod = &now; 1387 node->tn_mtime = *mod; 1388 } 1389 if (node->tn_status & TMPFS_NODE_CHANGED) { 1390 node->tn_ctime = now; 1391 } 1392 node->tn_status &= 1393 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED); 1394 } 1395 1396 /* --------------------------------------------------------------------- */ 1397 1398 void 1399 tmpfs_update(struct vnode *vp) 1400 { 1401 1402 tmpfs_itimes(vp, NULL, NULL); 1403 } 1404 1405 /* --------------------------------------------------------------------- */ 1406 1407 int 1408 tmpfs_truncate(struct vnode *vp, off_t length) 1409 { 1410 int error; 1411 struct tmpfs_node *node; 1412 1413 node = VP_TO_TMPFS_NODE(vp); 1414 1415 if (length < 0) { 1416 error = EINVAL; 1417 goto out; 1418 } 1419 1420 if (node->tn_size == length) { 1421 error = 0; 1422 goto out; 1423 } 1424 1425 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1426 return (EFBIG); 1427 1428 error = tmpfs_reg_resize(vp, length, FALSE); 1429 if (error == 0) { 1430 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1431 } 1432 1433 out: 1434 tmpfs_update(vp); 1435 1436 return error; 1437 } 1438