Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/fs/tmpfs/tmpfs_subr.c
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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/systm.h> 41 #include <sys/dirent.h> 42 #include <sys/fnv_hash.h> 43 #include <sys/lock.h> 44 #include <sys/namei.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/random.h> 48 #include <sys/rwlock.h> 49 #include <sys/stat.h> 50 #include <sys/sysctl.h> 51 #include <sys/vnode.h> 52 #include <sys/vmmeter.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_param.h> 56 #include <vm/vm_object.h> 57 #include <vm/vm_page.h> 58 #include <vm/vm_pageout.h> 59 #include <vm/vm_pager.h> 60 #include <vm/vm_extern.h> 61 62 #include <fs/tmpfs/tmpfs.h> 63 #include <fs/tmpfs/tmpfs_fifoops.h> 64 #include <fs/tmpfs/tmpfs_vnops.h> 65 66 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system"); 67 68 static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED; 69 70 static int 71 sysctl_mem_reserved(SYSCTL_HANDLER_ARGS) 72 { 73 int error; 74 long pages, bytes; 75 76 pages = *(long *)arg1; 77 bytes = pages * PAGE_SIZE; 78 79 error = sysctl_handle_long(oidp, &bytes, 0, req); 80 if (error || !req->newptr) 81 return (error); 82 83 pages = bytes / PAGE_SIZE; 84 if (pages < TMPFS_PAGES_MINRESERVED) 85 return (EINVAL); 86 87 *(long *)arg1 = pages; 88 return (0); 89 } 90 91 SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW, 92 &tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L", 93 "Amount of available memory and swap below which tmpfs growth stops"); 94 95 static __inline int tmpfs_dirtree_cmp(struct tmpfs_dirent *a, 96 struct tmpfs_dirent *b); 97 RB_PROTOTYPE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp); 98 99 size_t 100 tmpfs_mem_avail(void) 101 { 102 vm_ooffset_t avail; 103 104 avail = swap_pager_avail + vm_cnt.v_free_count - tmpfs_pages_reserved; 105 if (__predict_false(avail < 0)) 106 avail = 0; 107 return (avail); 108 } 109 110 size_t 111 tmpfs_pages_used(struct tmpfs_mount *tmp) 112 { 113 const size_t node_size = sizeof(struct tmpfs_node) + 114 sizeof(struct tmpfs_dirent); 115 size_t meta_pages; 116 117 meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size, 118 PAGE_SIZE); 119 return (meta_pages + tmp->tm_pages_used); 120 } 121 122 static size_t 123 tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages) 124 { 125 if (tmpfs_mem_avail() < req_pages) 126 return (0); 127 128 if (tmp->tm_pages_max != ULONG_MAX && 129 tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp)) 130 return (0); 131 132 return (1); 133 } 134 135 void 136 tmpfs_ref_node(struct tmpfs_node *node) 137 { 138 139 TMPFS_NODE_LOCK(node); 140 tmpfs_ref_node_locked(node); 141 TMPFS_NODE_UNLOCK(node); 142 } 143 144 void 145 tmpfs_ref_node_locked(struct tmpfs_node *node) 146 { 147 148 TMPFS_NODE_ASSERT_LOCKED(node); 149 KASSERT(node->tn_refcount > 0, ("node %p zero refcount", node)); 150 KASSERT(node->tn_refcount < UINT_MAX, ("node %p refcount %u", node, 151 node->tn_refcount)); 152 node->tn_refcount++; 153 } 154 155 /* 156 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 157 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 158 * using the credentials of the process 'p'. 159 * 160 * If the node type is set to 'VDIR', then the parent parameter must point 161 * to the parent directory of the node being created. It may only be NULL 162 * while allocating the root node. 163 * 164 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 165 * specifies the device the node represents. 166 * 167 * If the node type is set to 'VLNK', then the parameter target specifies 168 * the file name of the target file for the symbolic link that is being 169 * created. 170 * 171 * Note that new nodes are retrieved from the available list if it has 172 * items or, if it is empty, from the node pool as long as there is enough 173 * space to create them. 174 * 175 * Returns zero on success or an appropriate error code on failure. 176 */ 177 int 178 tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *tmp, enum vtype type, 179 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent, 180 char *target, dev_t rdev, struct tmpfs_node **node) 181 { 182 struct tmpfs_node *nnode; 183 vm_object_t obj; 184 185 /* If the root directory of the 'tmp' file system is not yet 186 * allocated, this must be the request to do it. */ 187 MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR)); 188 KASSERT(tmp->tm_root == NULL || mp->mnt_writeopcount > 0, 189 ("creating node not under vn_start_write")); 190 191 MPASS(IFF(type == VLNK, target != NULL)); 192 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL)); 193 194 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max) 195 return (ENOSPC); 196 if (tmpfs_pages_check_avail(tmp, 1) == 0) 197 return (ENOSPC); 198 199 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 200 /* 201 * When a new tmpfs node is created for fully 202 * constructed mount point, there must be a parent 203 * node, which vnode is locked exclusively. As 204 * consequence, if the unmount is executing in 205 * parallel, vflush() cannot reclaim the parent vnode. 206 * Due to this, the check for MNTK_UNMOUNT flag is not 207 * racy: if we did not see MNTK_UNMOUNT flag, then tmp 208 * cannot be destroyed until node construction is 209 * finished and the parent vnode unlocked. 210 * 211 * Tmpfs does not need to instantiate new nodes during 212 * unmount. 213 */ 214 return (EBUSY); 215 } 216 if ((mp->mnt_kern_flag & MNT_RDONLY) != 0) 217 return (EROFS); 218 219 nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp, 220 M_WAITOK); 221 222 /* Generic initialization. */ 223 nnode->tn_type = type; 224 vfs_timestamp(&nnode->tn_atime); 225 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime = 226 nnode->tn_atime; 227 nnode->tn_uid = uid; 228 nnode->tn_gid = gid; 229 nnode->tn_mode = mode; 230 nnode->tn_id = alloc_unr(tmp->tm_ino_unr); 231 nnode->tn_refcount = 1; 232 233 /* Type-specific initialization. */ 234 switch (nnode->tn_type) { 235 case VBLK: 236 case VCHR: 237 nnode->tn_rdev = rdev; 238 break; 239 240 case VDIR: 241 RB_INIT(&nnode->tn_dir.tn_dirhead); 242 LIST_INIT(&nnode->tn_dir.tn_dupindex); 243 MPASS(parent != nnode); 244 MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL)); 245 nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent; 246 nnode->tn_dir.tn_readdir_lastn = 0; 247 nnode->tn_dir.tn_readdir_lastp = NULL; 248 nnode->tn_links++; 249 TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent); 250 nnode->tn_dir.tn_parent->tn_links++; 251 TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent); 252 break; 253 254 case VFIFO: 255 /* FALLTHROUGH */ 256 case VSOCK: 257 break; 258 259 case VLNK: 260 MPASS(strlen(target) < MAXPATHLEN); 261 nnode->tn_size = strlen(target); 262 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME, 263 M_WAITOK); 264 memcpy(nnode->tn_link, target, nnode->tn_size); 265 break; 266 267 case VREG: 268 obj = nnode->tn_reg.tn_aobj = 269 vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0, 270 NULL /* XXXKIB - tmpfs needs swap reservation */); 271 VM_OBJECT_WLOCK(obj); 272 /* OBJ_TMPFS is set together with the setting of vp->v_object */ 273 vm_object_set_flag(obj, OBJ_NOSPLIT | OBJ_TMPFS_NODE); 274 vm_object_clear_flag(obj, OBJ_ONEMAPPING); 275 VM_OBJECT_WUNLOCK(obj); 276 break; 277 278 default: 279 panic("tmpfs_alloc_node: type %p %d", nnode, 280 (int)nnode->tn_type); 281 } 282 283 TMPFS_LOCK(tmp); 284 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 285 nnode->tn_attached = true; 286 tmp->tm_nodes_inuse++; 287 tmp->tm_refcount++; 288 TMPFS_UNLOCK(tmp); 289 290 *node = nnode; 291 return (0); 292 } 293 294 /* 295 * Destroys the node pointed to by node from the file system 'tmp'. 296 * If the node references a directory, no entries are allowed. 297 */ 298 void 299 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 300 { 301 302 TMPFS_LOCK(tmp); 303 TMPFS_NODE_LOCK(node); 304 if (!tmpfs_free_node_locked(tmp, node, false)) { 305 TMPFS_NODE_UNLOCK(node); 306 TMPFS_UNLOCK(tmp); 307 } 308 } 309 310 bool 311 tmpfs_free_node_locked(struct tmpfs_mount *tmp, struct tmpfs_node *node, 312 bool detach) 313 { 314 vm_object_t uobj; 315 316 TMPFS_MP_ASSERT_LOCKED(tmp); 317 TMPFS_NODE_ASSERT_LOCKED(node); 318 KASSERT(node->tn_refcount > 0, ("node %p refcount zero", node)); 319 320 node->tn_refcount--; 321 if (node->tn_attached && (detach || node->tn_refcount == 0)) { 322 MPASS(tmp->tm_nodes_inuse > 0); 323 tmp->tm_nodes_inuse--; 324 LIST_REMOVE(node, tn_entries); 325 node->tn_attached = false; 326 } 327 if (node->tn_refcount > 0) 328 return (false); 329 330 #ifdef INVARIANTS 331 MPASS(node->tn_vnode == NULL); 332 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0); 333 #endif 334 TMPFS_NODE_UNLOCK(node); 335 TMPFS_UNLOCK(tmp); 336 337 switch (node->tn_type) { 338 case VBLK: 339 /* FALLTHROUGH */ 340 case VCHR: 341 /* FALLTHROUGH */ 342 case VDIR: 343 /* FALLTHROUGH */ 344 case VFIFO: 345 /* FALLTHROUGH */ 346 case VSOCK: 347 break; 348 349 case VLNK: 350 free(node->tn_link, M_TMPFSNAME); 351 break; 352 353 case VREG: 354 uobj = node->tn_reg.tn_aobj; 355 if (uobj != NULL) { 356 if (uobj->size != 0) 357 atomic_subtract_long(&tmp->tm_pages_used, uobj->size); 358 KASSERT((uobj->flags & OBJ_TMPFS) == 0, 359 ("leaked OBJ_TMPFS node %p vm_obj %p", node, uobj)); 360 vm_object_deallocate(uobj); 361 } 362 break; 363 364 default: 365 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type); 366 } 367 368 free_unr(tmp->tm_ino_unr, node->tn_id); 369 uma_zfree(tmp->tm_node_pool, node); 370 TMPFS_LOCK(tmp); 371 tmpfs_free_tmp(tmp); 372 return (true); 373 } 374 375 static __inline uint32_t 376 tmpfs_dirent_hash(const char *name, u_int len) 377 { 378 uint32_t hash; 379 380 hash = fnv_32_buf(name, len, FNV1_32_INIT + len) & TMPFS_DIRCOOKIE_MASK; 381 #ifdef TMPFS_DEBUG_DIRCOOKIE_DUP 382 hash &= 0xf; 383 #endif 384 if (hash < TMPFS_DIRCOOKIE_MIN) 385 hash += TMPFS_DIRCOOKIE_MIN; 386 387 return (hash); 388 } 389 390 static __inline off_t 391 tmpfs_dirent_cookie(struct tmpfs_dirent *de) 392 { 393 if (de == NULL) 394 return (TMPFS_DIRCOOKIE_EOF); 395 396 MPASS(de->td_cookie >= TMPFS_DIRCOOKIE_MIN); 397 398 return (de->td_cookie); 399 } 400 401 static __inline boolean_t 402 tmpfs_dirent_dup(struct tmpfs_dirent *de) 403 { 404 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUP) != 0); 405 } 406 407 static __inline boolean_t 408 tmpfs_dirent_duphead(struct tmpfs_dirent *de) 409 { 410 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUPHEAD) != 0); 411 } 412 413 void 414 tmpfs_dirent_init(struct tmpfs_dirent *de, const char *name, u_int namelen) 415 { 416 de->td_hash = de->td_cookie = tmpfs_dirent_hash(name, namelen); 417 memcpy(de->ud.td_name, name, namelen); 418 de->td_namelen = namelen; 419 } 420 421 /* 422 * Allocates a new directory entry for the node node with a name of name. 423 * The new directory entry is returned in *de. 424 * 425 * The link count of node is increased by one to reflect the new object 426 * referencing it. 427 * 428 * Returns zero on success or an appropriate error code on failure. 429 */ 430 int 431 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 432 const char *name, u_int len, struct tmpfs_dirent **de) 433 { 434 struct tmpfs_dirent *nde; 435 436 nde = uma_zalloc(tmp->tm_dirent_pool, M_WAITOK); 437 nde->td_node = node; 438 if (name != NULL) { 439 nde->ud.td_name = malloc(len, M_TMPFSNAME, M_WAITOK); 440 tmpfs_dirent_init(nde, name, len); 441 } else 442 nde->td_namelen = 0; 443 if (node != NULL) 444 node->tn_links++; 445 446 *de = nde; 447 448 return 0; 449 } 450 451 /* 452 * Frees a directory entry. It is the caller's responsibility to destroy 453 * the node referenced by it if needed. 454 * 455 * The link count of node is decreased by one to reflect the removal of an 456 * object that referenced it. This only happens if 'node_exists' is true; 457 * otherwise the function will not access the node referred to by the 458 * directory entry, as it may already have been released from the outside. 459 */ 460 void 461 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de) 462 { 463 struct tmpfs_node *node; 464 465 node = de->td_node; 466 if (node != NULL) { 467 MPASS(node->tn_links > 0); 468 node->tn_links--; 469 } 470 if (!tmpfs_dirent_duphead(de) && de->ud.td_name != NULL) 471 free(de->ud.td_name, M_TMPFSNAME); 472 uma_zfree(tmp->tm_dirent_pool, de); 473 } 474 475 void 476 tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj) 477 { 478 479 ASSERT_VOP_ELOCKED(vp, "tmpfs_destroy_vobject"); 480 if (vp->v_type != VREG || obj == NULL) 481 return; 482 483 VM_OBJECT_WLOCK(obj); 484 VI_LOCK(vp); 485 vm_object_clear_flag(obj, OBJ_TMPFS); 486 obj->un_pager.swp.swp_tmpfs = NULL; 487 VI_UNLOCK(vp); 488 VM_OBJECT_WUNLOCK(obj); 489 } 490 491 /* 492 * Need to clear v_object for insmntque failure. 493 */ 494 static void 495 tmpfs_insmntque_dtr(struct vnode *vp, void *dtr_arg) 496 { 497 498 tmpfs_destroy_vobject(vp, vp->v_object); 499 vp->v_object = NULL; 500 vp->v_data = NULL; 501 vp->v_op = &dead_vnodeops; 502 vgone(vp); 503 vput(vp); 504 } 505 506 /* 507 * Allocates a new vnode for the node node or returns a new reference to 508 * an existing one if the node had already a vnode referencing it. The 509 * resulting locked vnode is returned in *vpp. 510 * 511 * Returns zero on success or an appropriate error code on failure. 512 */ 513 int 514 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag, 515 struct vnode **vpp) 516 { 517 struct vnode *vp; 518 struct tmpfs_mount *tm; 519 vm_object_t object; 520 int error; 521 522 error = 0; 523 tm = VFS_TO_TMPFS(mp); 524 TMPFS_NODE_LOCK(node); 525 tmpfs_ref_node_locked(node); 526 loop: 527 TMPFS_NODE_ASSERT_LOCKED(node); 528 if ((vp = node->tn_vnode) != NULL) { 529 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0); 530 VI_LOCK(vp); 531 if ((node->tn_type == VDIR && node->tn_dir.tn_parent == NULL) || 532 ((vp->v_iflag & VI_DOOMED) != 0 && 533 (lkflag & LK_NOWAIT) != 0)) { 534 VI_UNLOCK(vp); 535 TMPFS_NODE_UNLOCK(node); 536 error = ENOENT; 537 vp = NULL; 538 goto out; 539 } 540 if ((vp->v_iflag & VI_DOOMED) != 0) { 541 VI_UNLOCK(vp); 542 node->tn_vpstate |= TMPFS_VNODE_WRECLAIM; 543 while ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) { 544 msleep(&node->tn_vnode, TMPFS_NODE_MTX(node), 545 0, "tmpfsE", 0); 546 } 547 goto loop; 548 } 549 TMPFS_NODE_UNLOCK(node); 550 error = vget(vp, lkflag | LK_INTERLOCK, curthread); 551 if (error == ENOENT) { 552 TMPFS_NODE_LOCK(node); 553 goto loop; 554 } 555 if (error != 0) { 556 vp = NULL; 557 goto out; 558 } 559 560 /* 561 * Make sure the vnode is still there after 562 * getting the interlock to avoid racing a free. 563 */ 564 if (node->tn_vnode == NULL || node->tn_vnode != vp) { 565 vput(vp); 566 TMPFS_NODE_LOCK(node); 567 goto loop; 568 } 569 570 goto out; 571 } 572 573 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) || 574 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) { 575 TMPFS_NODE_UNLOCK(node); 576 error = ENOENT; 577 vp = NULL; 578 goto out; 579 } 580 581 /* 582 * otherwise lock the vp list while we call getnewvnode 583 * since that can block. 584 */ 585 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) { 586 node->tn_vpstate |= TMPFS_VNODE_WANT; 587 error = msleep((caddr_t) &node->tn_vpstate, 588 TMPFS_NODE_MTX(node), 0, "tmpfs_alloc_vp", 0); 589 if (error != 0) 590 goto out; 591 goto loop; 592 } else 593 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING; 594 595 TMPFS_NODE_UNLOCK(node); 596 597 /* Get a new vnode and associate it with our node. */ 598 error = getnewvnode("tmpfs", mp, VFS_TO_TMPFS(mp)->tm_nonc ? 599 &tmpfs_vnodeop_nonc_entries : &tmpfs_vnodeop_entries, &vp); 600 if (error != 0) 601 goto unlock; 602 MPASS(vp != NULL); 603 604 /* lkflag is ignored, the lock is exclusive */ 605 (void) vn_lock(vp, lkflag | LK_RETRY); 606 607 vp->v_data = node; 608 vp->v_type = node->tn_type; 609 610 /* Type-specific initialization. */ 611 switch (node->tn_type) { 612 case VBLK: 613 /* FALLTHROUGH */ 614 case VCHR: 615 /* FALLTHROUGH */ 616 case VLNK: 617 /* FALLTHROUGH */ 618 case VSOCK: 619 break; 620 case VFIFO: 621 vp->v_op = &tmpfs_fifoop_entries; 622 break; 623 case VREG: 624 object = node->tn_reg.tn_aobj; 625 VM_OBJECT_WLOCK(object); 626 VI_LOCK(vp); 627 KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs")); 628 vp->v_object = object; 629 object->un_pager.swp.swp_tmpfs = vp; 630 vm_object_set_flag(object, OBJ_TMPFS); 631 VI_UNLOCK(vp); 632 VM_OBJECT_WUNLOCK(object); 633 break; 634 case VDIR: 635 MPASS(node->tn_dir.tn_parent != NULL); 636 if (node->tn_dir.tn_parent == node) 637 vp->v_vflag |= VV_ROOT; 638 break; 639 640 default: 641 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 642 } 643 if (vp->v_type != VFIFO) 644 VN_LOCK_ASHARE(vp); 645 646 error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL); 647 if (error != 0) 648 vp = NULL; 649 650 unlock: 651 TMPFS_NODE_LOCK(node); 652 653 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING); 654 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING; 655 node->tn_vnode = vp; 656 657 if (node->tn_vpstate & TMPFS_VNODE_WANT) { 658 node->tn_vpstate &= ~TMPFS_VNODE_WANT; 659 TMPFS_NODE_UNLOCK(node); 660 wakeup((caddr_t) &node->tn_vpstate); 661 } else 662 TMPFS_NODE_UNLOCK(node); 663 664 out: 665 if (error == 0) { 666 *vpp = vp; 667 668 #ifdef INVARIANTS 669 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp)); 670 TMPFS_NODE_LOCK(node); 671 MPASS(*vpp == node->tn_vnode); 672 TMPFS_NODE_UNLOCK(node); 673 #endif 674 } 675 tmpfs_free_node(tm, node); 676 677 return (error); 678 } 679 680 /* 681 * Destroys the association between the vnode vp and the node it 682 * references. 683 */ 684 void 685 tmpfs_free_vp(struct vnode *vp) 686 { 687 struct tmpfs_node *node; 688 689 node = VP_TO_TMPFS_NODE(vp); 690 691 TMPFS_NODE_ASSERT_LOCKED(node); 692 node->tn_vnode = NULL; 693 if ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) 694 wakeup(&node->tn_vnode); 695 node->tn_vpstate &= ~TMPFS_VNODE_WRECLAIM; 696 vp->v_data = NULL; 697 } 698 699 /* 700 * Allocates a new file of type 'type' and adds it to the parent directory 701 * 'dvp'; this addition is done using the component name given in 'cnp'. 702 * The ownership of the new file is automatically assigned based on the 703 * credentials of the caller (through 'cnp'), the group is set based on 704 * the parent directory and the mode is determined from the 'vap' argument. 705 * If successful, *vpp holds a vnode to the newly created file and zero 706 * is returned. Otherwise *vpp is NULL and the function returns an 707 * appropriate error code. 708 */ 709 int 710 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 711 struct componentname *cnp, char *target) 712 { 713 int error; 714 struct tmpfs_dirent *de; 715 struct tmpfs_mount *tmp; 716 struct tmpfs_node *dnode; 717 struct tmpfs_node *node; 718 struct tmpfs_node *parent; 719 720 ASSERT_VOP_ELOCKED(dvp, "tmpfs_alloc_file"); 721 MPASS(cnp->cn_flags & HASBUF); 722 723 tmp = VFS_TO_TMPFS(dvp->v_mount); 724 dnode = VP_TO_TMPFS_DIR(dvp); 725 *vpp = NULL; 726 727 /* If the entry we are creating is a directory, we cannot overflow 728 * the number of links of its parent, because it will get a new 729 * link. */ 730 if (vap->va_type == VDIR) { 731 /* Ensure that we do not overflow the maximum number of links 732 * imposed by the system. */ 733 MPASS(dnode->tn_links <= LINK_MAX); 734 if (dnode->tn_links == LINK_MAX) { 735 return (EMLINK); 736 } 737 738 parent = dnode; 739 MPASS(parent != NULL); 740 } else 741 parent = NULL; 742 743 /* Allocate a node that represents the new file. */ 744 error = tmpfs_alloc_node(dvp->v_mount, tmp, vap->va_type, 745 cnp->cn_cred->cr_uid, dnode->tn_gid, vap->va_mode, parent, 746 target, vap->va_rdev, &node); 747 if (error != 0) 748 return (error); 749 750 /* Allocate a directory entry that points to the new file. */ 751 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen, 752 &de); 753 if (error != 0) { 754 tmpfs_free_node(tmp, node); 755 return (error); 756 } 757 758 /* Allocate a vnode for the new file. */ 759 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp); 760 if (error != 0) { 761 tmpfs_free_dirent(tmp, de); 762 tmpfs_free_node(tmp, node); 763 return (error); 764 } 765 766 /* Now that all required items are allocated, we can proceed to 767 * insert the new node into the directory, an operation that 768 * cannot fail. */ 769 if (cnp->cn_flags & ISWHITEOUT) 770 tmpfs_dir_whiteout_remove(dvp, cnp); 771 tmpfs_dir_attach(dvp, de); 772 return (0); 773 } 774 775 struct tmpfs_dirent * 776 tmpfs_dir_first(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc) 777 { 778 struct tmpfs_dirent *de; 779 780 de = RB_MIN(tmpfs_dir, &dnode->tn_dir.tn_dirhead); 781 dc->tdc_tree = de; 782 if (de != NULL && tmpfs_dirent_duphead(de)) 783 de = LIST_FIRST(&de->ud.td_duphead); 784 dc->tdc_current = de; 785 786 return (dc->tdc_current); 787 } 788 789 struct tmpfs_dirent * 790 tmpfs_dir_next(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc) 791 { 792 struct tmpfs_dirent *de; 793 794 MPASS(dc->tdc_tree != NULL); 795 if (tmpfs_dirent_dup(dc->tdc_current)) { 796 dc->tdc_current = LIST_NEXT(dc->tdc_current, uh.td_dup.entries); 797 if (dc->tdc_current != NULL) 798 return (dc->tdc_current); 799 } 800 dc->tdc_tree = dc->tdc_current = RB_NEXT(tmpfs_dir, 801 &dnode->tn_dir.tn_dirhead, dc->tdc_tree); 802 if ((de = dc->tdc_current) != NULL && tmpfs_dirent_duphead(de)) { 803 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead); 804 MPASS(dc->tdc_current != NULL); 805 } 806 807 return (dc->tdc_current); 808 } 809 810 /* Lookup directory entry in RB-Tree. Function may return duphead entry. */ 811 static struct tmpfs_dirent * 812 tmpfs_dir_xlookup_hash(struct tmpfs_node *dnode, uint32_t hash) 813 { 814 struct tmpfs_dirent *de, dekey; 815 816 dekey.td_hash = hash; 817 de = RB_FIND(tmpfs_dir, &dnode->tn_dir.tn_dirhead, &dekey); 818 return (de); 819 } 820 821 /* Lookup directory entry by cookie, initialize directory cursor accordingly. */ 822 static struct tmpfs_dirent * 823 tmpfs_dir_lookup_cookie(struct tmpfs_node *node, off_t cookie, 824 struct tmpfs_dir_cursor *dc) 825 { 826 struct tmpfs_dir *dirhead = &node->tn_dir.tn_dirhead; 827 struct tmpfs_dirent *de, dekey; 828 829 MPASS(cookie >= TMPFS_DIRCOOKIE_MIN); 830 831 if (cookie == node->tn_dir.tn_readdir_lastn && 832 (de = node->tn_dir.tn_readdir_lastp) != NULL) { 833 /* Protect against possible race, tn_readdir_last[pn] 834 * may be updated with only shared vnode lock held. */ 835 if (cookie == tmpfs_dirent_cookie(de)) 836 goto out; 837 } 838 839 if ((cookie & TMPFS_DIRCOOKIE_DUP) != 0) { 840 LIST_FOREACH(de, &node->tn_dir.tn_dupindex, 841 uh.td_dup.index_entries) { 842 MPASS(tmpfs_dirent_dup(de)); 843 if (de->td_cookie == cookie) 844 goto out; 845 /* dupindex list is sorted. */ 846 if (de->td_cookie < cookie) { 847 de = NULL; 848 goto out; 849 } 850 } 851 MPASS(de == NULL); 852 goto out; 853 } 854 855 if ((cookie & TMPFS_DIRCOOKIE_MASK) != cookie) { 856 de = NULL; 857 } else { 858 dekey.td_hash = cookie; 859 /* Recover if direntry for cookie was removed */ 860 de = RB_NFIND(tmpfs_dir, dirhead, &dekey); 861 } 862 dc->tdc_tree = de; 863 dc->tdc_current = de; 864 if (de != NULL && tmpfs_dirent_duphead(de)) { 865 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead); 866 MPASS(dc->tdc_current != NULL); 867 } 868 return (dc->tdc_current); 869 870 out: 871 dc->tdc_tree = de; 872 dc->tdc_current = de; 873 if (de != NULL && tmpfs_dirent_dup(de)) 874 dc->tdc_tree = tmpfs_dir_xlookup_hash(node, 875 de->td_hash); 876 return (dc->tdc_current); 877 } 878 879 /* 880 * Looks for a directory entry in the directory represented by node. 881 * 'cnp' describes the name of the entry to look for. Note that the . 882 * and .. components are not allowed as they do not physically exist 883 * within directories. 884 * 885 * Returns a pointer to the entry when found, otherwise NULL. 886 */ 887 struct tmpfs_dirent * 888 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 889 struct componentname *cnp) 890 { 891 struct tmpfs_dir_duphead *duphead; 892 struct tmpfs_dirent *de; 893 uint32_t hash; 894 895 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.')); 896 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' && 897 cnp->cn_nameptr[1] == '.'))); 898 TMPFS_VALIDATE_DIR(node); 899 900 hash = tmpfs_dirent_hash(cnp->cn_nameptr, cnp->cn_namelen); 901 de = tmpfs_dir_xlookup_hash(node, hash); 902 if (de != NULL && tmpfs_dirent_duphead(de)) { 903 duphead = &de->ud.td_duphead; 904 LIST_FOREACH(de, duphead, uh.td_dup.entries) { 905 if (TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr, 906 cnp->cn_namelen)) 907 break; 908 } 909 } else if (de != NULL) { 910 if (!TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr, 911 cnp->cn_namelen)) 912 de = NULL; 913 } 914 if (de != NULL && f != NULL && de->td_node != f) 915 de = NULL; 916 917 return (de); 918 } 919 920 /* 921 * Attach duplicate-cookie directory entry nde to dnode and insert to dupindex 922 * list, allocate new cookie value. 923 */ 924 static void 925 tmpfs_dir_attach_dup(struct tmpfs_node *dnode, 926 struct tmpfs_dir_duphead *duphead, struct tmpfs_dirent *nde) 927 { 928 struct tmpfs_dir_duphead *dupindex; 929 struct tmpfs_dirent *de, *pde; 930 931 dupindex = &dnode->tn_dir.tn_dupindex; 932 de = LIST_FIRST(dupindex); 933 if (de == NULL || de->td_cookie < TMPFS_DIRCOOKIE_DUP_MAX) { 934 if (de == NULL) 935 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN; 936 else 937 nde->td_cookie = de->td_cookie + 1; 938 MPASS(tmpfs_dirent_dup(nde)); 939 LIST_INSERT_HEAD(dupindex, nde, uh.td_dup.index_entries); 940 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 941 return; 942 } 943 944 /* 945 * Cookie numbers are near exhaustion. Scan dupindex list for unused 946 * numbers. dupindex list is sorted in descending order. Keep it so 947 * after inserting nde. 948 */ 949 while (1) { 950 pde = de; 951 de = LIST_NEXT(de, uh.td_dup.index_entries); 952 if (de == NULL && pde->td_cookie != TMPFS_DIRCOOKIE_DUP_MIN) { 953 /* 954 * Last element of the index doesn't have minimal cookie 955 * value, use it. 956 */ 957 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN; 958 LIST_INSERT_AFTER(pde, nde, uh.td_dup.index_entries); 959 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 960 return; 961 } else if (de == NULL) { 962 /* 963 * We are so lucky have 2^30 hash duplicates in single 964 * directory :) Return largest possible cookie value. 965 * It should be fine except possible issues with 966 * VOP_READDIR restart. 967 */ 968 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MAX; 969 LIST_INSERT_HEAD(dupindex, nde, 970 uh.td_dup.index_entries); 971 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 972 return; 973 } 974 if (de->td_cookie + 1 == pde->td_cookie || 975 de->td_cookie >= TMPFS_DIRCOOKIE_DUP_MAX) 976 continue; /* No hole or invalid cookie. */ 977 nde->td_cookie = de->td_cookie + 1; 978 MPASS(tmpfs_dirent_dup(nde)); 979 MPASS(pde->td_cookie > nde->td_cookie); 980 MPASS(nde->td_cookie > de->td_cookie); 981 LIST_INSERT_BEFORE(de, nde, uh.td_dup.index_entries); 982 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 983 return; 984 } 985 } 986 987 /* 988 * Attaches the directory entry de to the directory represented by vp. 989 * Note that this does not change the link count of the node pointed by 990 * the directory entry, as this is done by tmpfs_alloc_dirent. 991 */ 992 void 993 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de) 994 { 995 struct tmpfs_node *dnode; 996 struct tmpfs_dirent *xde, *nde; 997 998 ASSERT_VOP_ELOCKED(vp, __func__); 999 MPASS(de->td_namelen > 0); 1000 MPASS(de->td_hash >= TMPFS_DIRCOOKIE_MIN); 1001 MPASS(de->td_cookie == de->td_hash); 1002 1003 dnode = VP_TO_TMPFS_DIR(vp); 1004 dnode->tn_dir.tn_readdir_lastn = 0; 1005 dnode->tn_dir.tn_readdir_lastp = NULL; 1006 1007 MPASS(!tmpfs_dirent_dup(de)); 1008 xde = RB_INSERT(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de); 1009 if (xde != NULL && tmpfs_dirent_duphead(xde)) 1010 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de); 1011 else if (xde != NULL) { 1012 /* 1013 * Allocate new duphead. Swap xde with duphead to avoid 1014 * adding/removing elements with the same hash. 1015 */ 1016 MPASS(!tmpfs_dirent_dup(xde)); 1017 tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), NULL, NULL, 0, 1018 &nde); 1019 /* *nde = *xde; XXX gcc 4.2.1 may generate invalid code. */ 1020 memcpy(nde, xde, sizeof(*xde)); 1021 xde->td_cookie |= TMPFS_DIRCOOKIE_DUPHEAD; 1022 LIST_INIT(&xde->ud.td_duphead); 1023 xde->td_namelen = 0; 1024 xde->td_node = NULL; 1025 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, nde); 1026 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de); 1027 } 1028 dnode->tn_size += sizeof(struct tmpfs_dirent); 1029 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1030 TMPFS_NODE_MODIFIED; 1031 tmpfs_update(vp); 1032 } 1033 1034 /* 1035 * Detaches the directory entry de from the directory represented by vp. 1036 * Note that this does not change the link count of the node pointed by 1037 * the directory entry, as this is done by tmpfs_free_dirent. 1038 */ 1039 void 1040 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de) 1041 { 1042 struct tmpfs_mount *tmp; 1043 struct tmpfs_dir *head; 1044 struct tmpfs_node *dnode; 1045 struct tmpfs_dirent *xde; 1046 1047 ASSERT_VOP_ELOCKED(vp, __func__); 1048 1049 dnode = VP_TO_TMPFS_DIR(vp); 1050 head = &dnode->tn_dir.tn_dirhead; 1051 dnode->tn_dir.tn_readdir_lastn = 0; 1052 dnode->tn_dir.tn_readdir_lastp = NULL; 1053 1054 if (tmpfs_dirent_dup(de)) { 1055 /* Remove duphead if de was last entry. */ 1056 if (LIST_NEXT(de, uh.td_dup.entries) == NULL) { 1057 xde = tmpfs_dir_xlookup_hash(dnode, de->td_hash); 1058 MPASS(tmpfs_dirent_duphead(xde)); 1059 } else 1060 xde = NULL; 1061 LIST_REMOVE(de, uh.td_dup.entries); 1062 LIST_REMOVE(de, uh.td_dup.index_entries); 1063 if (xde != NULL) { 1064 if (LIST_EMPTY(&xde->ud.td_duphead)) { 1065 RB_REMOVE(tmpfs_dir, head, xde); 1066 tmp = VFS_TO_TMPFS(vp->v_mount); 1067 MPASS(xde->td_node == NULL); 1068 tmpfs_free_dirent(tmp, xde); 1069 } 1070 } 1071 de->td_cookie = de->td_hash; 1072 } else 1073 RB_REMOVE(tmpfs_dir, head, de); 1074 1075 dnode->tn_size -= sizeof(struct tmpfs_dirent); 1076 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1077 TMPFS_NODE_MODIFIED; 1078 tmpfs_update(vp); 1079 } 1080 1081 void 1082 tmpfs_dir_destroy(struct tmpfs_mount *tmp, struct tmpfs_node *dnode) 1083 { 1084 struct tmpfs_dirent *de, *dde, *nde; 1085 1086 RB_FOREACH_SAFE(de, tmpfs_dir, &dnode->tn_dir.tn_dirhead, nde) { 1087 RB_REMOVE(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de); 1088 /* Node may already be destroyed. */ 1089 de->td_node = NULL; 1090 if (tmpfs_dirent_duphead(de)) { 1091 while ((dde = LIST_FIRST(&de->ud.td_duphead)) != NULL) { 1092 LIST_REMOVE(dde, uh.td_dup.entries); 1093 dde->td_node = NULL; 1094 tmpfs_free_dirent(tmp, dde); 1095 } 1096 } 1097 tmpfs_free_dirent(tmp, de); 1098 } 1099 } 1100 1101 /* 1102 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 1103 * directory and returns it in the uio space. The function returns 0 1104 * on success, -1 if there was not enough space in the uio structure to 1105 * hold the directory entry or an appropriate error code if another 1106 * error happens. 1107 */ 1108 static int 1109 tmpfs_dir_getdotdent(struct tmpfs_mount *tm, struct tmpfs_node *node, 1110 struct uio *uio) 1111 { 1112 int error; 1113 struct dirent dent; 1114 1115 TMPFS_VALIDATE_DIR(node); 1116 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 1117 1118 dent.d_fileno = node->tn_id; 1119 dent.d_type = DT_DIR; 1120 dent.d_namlen = 1; 1121 dent.d_name[0] = '.'; 1122 dent.d_reclen = GENERIC_DIRSIZ(&dent); 1123 dirent_terminate(&dent); 1124 1125 if (dent.d_reclen > uio->uio_resid) 1126 error = EJUSTRETURN; 1127 else 1128 error = uiomove(&dent, dent.d_reclen, uio); 1129 1130 tmpfs_set_status(tm, node, TMPFS_NODE_ACCESSED); 1131 1132 return (error); 1133 } 1134 1135 /* 1136 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 1137 * directory and returns it in the uio space. The function returns 0 1138 * on success, -1 if there was not enough space in the uio structure to 1139 * hold the directory entry or an appropriate error code if another 1140 * error happens. 1141 */ 1142 static int 1143 tmpfs_dir_getdotdotdent(struct tmpfs_mount *tm, struct tmpfs_node *node, 1144 struct uio *uio) 1145 { 1146 struct tmpfs_node *parent; 1147 struct dirent dent; 1148 int error; 1149 1150 TMPFS_VALIDATE_DIR(node); 1151 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 1152 1153 /* 1154 * Return ENOENT if the current node is already removed. 1155 */ 1156 TMPFS_ASSERT_LOCKED(node); 1157 parent = node->tn_dir.tn_parent; 1158 if (parent == NULL) 1159 return (ENOENT); 1160 1161 TMPFS_NODE_LOCK(parent); 1162 dent.d_fileno = parent->tn_id; 1163 TMPFS_NODE_UNLOCK(parent); 1164 1165 dent.d_type = DT_DIR; 1166 dent.d_namlen = 2; 1167 dent.d_name[0] = '.'; 1168 dent.d_name[1] = '.'; 1169 dent.d_reclen = GENERIC_DIRSIZ(&dent); 1170 dirent_terminate(&dent); 1171 1172 if (dent.d_reclen > uio->uio_resid) 1173 error = EJUSTRETURN; 1174 else 1175 error = uiomove(&dent, dent.d_reclen, uio); 1176 1177 tmpfs_set_status(tm, node, TMPFS_NODE_ACCESSED); 1178 1179 return (error); 1180 } 1181 1182 /* 1183 * Helper function for tmpfs_readdir. Returns as much directory entries 1184 * as can fit in the uio space. The read starts at uio->uio_offset. 1185 * The function returns 0 on success, -1 if there was not enough space 1186 * in the uio structure to hold the directory entry or an appropriate 1187 * error code if another error happens. 1188 */ 1189 int 1190 tmpfs_dir_getdents(struct tmpfs_mount *tm, struct tmpfs_node *node, 1191 struct uio *uio, int maxcookies, u_long *cookies, int *ncookies) 1192 { 1193 struct tmpfs_dir_cursor dc; 1194 struct tmpfs_dirent *de; 1195 off_t off; 1196 int error; 1197 1198 TMPFS_VALIDATE_DIR(node); 1199 1200 off = 0; 1201 1202 /* 1203 * Lookup the node from the current offset. The starting offset of 1204 * 0 will lookup both '.' and '..', and then the first real entry, 1205 * or EOF if there are none. Then find all entries for the dir that 1206 * fit into the buffer. Once no more entries are found (de == NULL), 1207 * the offset is set to TMPFS_DIRCOOKIE_EOF, which will cause the next 1208 * call to return 0. 1209 */ 1210 switch (uio->uio_offset) { 1211 case TMPFS_DIRCOOKIE_DOT: 1212 error = tmpfs_dir_getdotdent(tm, node, uio); 1213 if (error != 0) 1214 return (error); 1215 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 1216 if (cookies != NULL) 1217 cookies[(*ncookies)++] = off = uio->uio_offset; 1218 /* FALLTHROUGH */ 1219 case TMPFS_DIRCOOKIE_DOTDOT: 1220 error = tmpfs_dir_getdotdotdent(tm, node, uio); 1221 if (error != 0) 1222 return (error); 1223 de = tmpfs_dir_first(node, &dc); 1224 uio->uio_offset = tmpfs_dirent_cookie(de); 1225 if (cookies != NULL) 1226 cookies[(*ncookies)++] = off = uio->uio_offset; 1227 /* EOF. */ 1228 if (de == NULL) 1229 return (0); 1230 break; 1231 case TMPFS_DIRCOOKIE_EOF: 1232 return (0); 1233 default: 1234 de = tmpfs_dir_lookup_cookie(node, uio->uio_offset, &dc); 1235 if (de == NULL) 1236 return (EINVAL); 1237 if (cookies != NULL) 1238 off = tmpfs_dirent_cookie(de); 1239 } 1240 1241 /* Read as much entries as possible; i.e., until we reach the end of 1242 * the directory or we exhaust uio space. */ 1243 do { 1244 struct dirent d; 1245 1246 /* Create a dirent structure representing the current 1247 * tmpfs_node and fill it. */ 1248 if (de->td_node == NULL) { 1249 d.d_fileno = 1; 1250 d.d_type = DT_WHT; 1251 } else { 1252 d.d_fileno = de->td_node->tn_id; 1253 switch (de->td_node->tn_type) { 1254 case VBLK: 1255 d.d_type = DT_BLK; 1256 break; 1257 1258 case VCHR: 1259 d.d_type = DT_CHR; 1260 break; 1261 1262 case VDIR: 1263 d.d_type = DT_DIR; 1264 break; 1265 1266 case VFIFO: 1267 d.d_type = DT_FIFO; 1268 break; 1269 1270 case VLNK: 1271 d.d_type = DT_LNK; 1272 break; 1273 1274 case VREG: 1275 d.d_type = DT_REG; 1276 break; 1277 1278 case VSOCK: 1279 d.d_type = DT_SOCK; 1280 break; 1281 1282 default: 1283 panic("tmpfs_dir_getdents: type %p %d", 1284 de->td_node, (int)de->td_node->tn_type); 1285 } 1286 } 1287 d.d_namlen = de->td_namelen; 1288 MPASS(de->td_namelen < sizeof(d.d_name)); 1289 (void)memcpy(d.d_name, de->ud.td_name, de->td_namelen); 1290 d.d_reclen = GENERIC_DIRSIZ(&d); 1291 dirent_terminate(&d); 1292 1293 /* Stop reading if the directory entry we are treating is 1294 * bigger than the amount of data that can be returned. */ 1295 if (d.d_reclen > uio->uio_resid) { 1296 error = EJUSTRETURN; 1297 break; 1298 } 1299 1300 /* Copy the new dirent structure into the output buffer and 1301 * advance pointers. */ 1302 error = uiomove(&d, d.d_reclen, uio); 1303 if (error == 0) { 1304 de = tmpfs_dir_next(node, &dc); 1305 if (cookies != NULL) { 1306 off = tmpfs_dirent_cookie(de); 1307 MPASS(*ncookies < maxcookies); 1308 cookies[(*ncookies)++] = off; 1309 } 1310 } 1311 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 1312 1313 /* Skip setting off when using cookies as it is already done above. */ 1314 if (cookies == NULL) 1315 off = tmpfs_dirent_cookie(de); 1316 1317 /* Update the offset and cache. */ 1318 uio->uio_offset = off; 1319 node->tn_dir.tn_readdir_lastn = off; 1320 node->tn_dir.tn_readdir_lastp = de; 1321 1322 tmpfs_set_status(tm, node, TMPFS_NODE_ACCESSED); 1323 return error; 1324 } 1325 1326 int 1327 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp) 1328 { 1329 struct tmpfs_dirent *de; 1330 int error; 1331 1332 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL, 1333 cnp->cn_nameptr, cnp->cn_namelen, &de); 1334 if (error != 0) 1335 return (error); 1336 tmpfs_dir_attach(dvp, de); 1337 return (0); 1338 } 1339 1340 void 1341 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp) 1342 { 1343 struct tmpfs_dirent *de; 1344 1345 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1346 MPASS(de != NULL && de->td_node == NULL); 1347 tmpfs_dir_detach(dvp, de); 1348 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de); 1349 } 1350 1351 /* 1352 * Resizes the aobj associated with the regular file pointed to by 'vp' to the 1353 * size 'newsize'. 'vp' must point to a vnode that represents a regular file. 1354 * 'newsize' must be positive. 1355 * 1356 * Returns zero on success or an appropriate error code on failure. 1357 */ 1358 int 1359 tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr) 1360 { 1361 struct tmpfs_mount *tmp; 1362 struct tmpfs_node *node; 1363 vm_object_t uobj; 1364 vm_page_t m; 1365 vm_pindex_t idx, newpages, oldpages; 1366 off_t oldsize; 1367 int base, rv; 1368 1369 MPASS(vp->v_type == VREG); 1370 MPASS(newsize >= 0); 1371 1372 node = VP_TO_TMPFS_NODE(vp); 1373 uobj = node->tn_reg.tn_aobj; 1374 tmp = VFS_TO_TMPFS(vp->v_mount); 1375 1376 /* 1377 * Convert the old and new sizes to the number of pages needed to 1378 * store them. It may happen that we do not need to do anything 1379 * because the last allocated page can accommodate the change on 1380 * its own. 1381 */ 1382 oldsize = node->tn_size; 1383 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK); 1384 MPASS(oldpages == uobj->size); 1385 newpages = OFF_TO_IDX(newsize + PAGE_MASK); 1386 1387 if (__predict_true(newpages == oldpages && newsize >= oldsize)) { 1388 node->tn_size = newsize; 1389 return (0); 1390 } 1391 1392 if (newpages > oldpages && 1393 tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0) 1394 return (ENOSPC); 1395 1396 VM_OBJECT_WLOCK(uobj); 1397 if (newsize < oldsize) { 1398 /* 1399 * Zero the truncated part of the last page. 1400 */ 1401 base = newsize & PAGE_MASK; 1402 if (base != 0) { 1403 idx = OFF_TO_IDX(newsize); 1404 retry: 1405 m = vm_page_lookup(uobj, idx); 1406 if (m != NULL) { 1407 if (vm_page_sleep_if_busy(m, "tmfssz")) 1408 goto retry; 1409 MPASS(m->valid == VM_PAGE_BITS_ALL); 1410 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) { 1411 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL | 1412 VM_ALLOC_WAITFAIL); 1413 if (m == NULL) 1414 goto retry; 1415 rv = vm_pager_get_pages(uobj, &m, 1, NULL, 1416 NULL); 1417 vm_page_lock(m); 1418 if (rv == VM_PAGER_OK) { 1419 vm_page_deactivate(m); 1420 vm_page_unlock(m); 1421 vm_page_xunbusy(m); 1422 } else { 1423 vm_page_free(m); 1424 vm_page_unlock(m); 1425 if (ignerr) 1426 m = NULL; 1427 else { 1428 VM_OBJECT_WUNLOCK(uobj); 1429 return (EIO); 1430 } 1431 } 1432 } 1433 if (m != NULL) { 1434 pmap_zero_page_area(m, base, PAGE_SIZE - base); 1435 vm_page_dirty(m); 1436 vm_pager_page_unswapped(m); 1437 } 1438 } 1439 1440 /* 1441 * Release any swap space and free any whole pages. 1442 */ 1443 if (newpages < oldpages) { 1444 swap_pager_freespace(uobj, newpages, oldpages - 1445 newpages); 1446 vm_object_page_remove(uobj, newpages, 0, 0); 1447 } 1448 } 1449 uobj->size = newpages; 1450 VM_OBJECT_WUNLOCK(uobj); 1451 1452 atomic_add_long(&tmp->tm_pages_used, newpages - oldpages); 1453 1454 node->tn_size = newsize; 1455 return (0); 1456 } 1457 1458 void 1459 tmpfs_check_mtime(struct vnode *vp) 1460 { 1461 struct tmpfs_node *node; 1462 struct vm_object *obj; 1463 1464 ASSERT_VOP_ELOCKED(vp, "check_mtime"); 1465 if (vp->v_type != VREG) 1466 return; 1467 obj = vp->v_object; 1468 KASSERT((obj->flags & (OBJ_TMPFS_NODE | OBJ_TMPFS)) == 1469 (OBJ_TMPFS_NODE | OBJ_TMPFS), ("non-tmpfs obj")); 1470 /* unlocked read */ 1471 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) { 1472 VM_OBJECT_WLOCK(obj); 1473 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) { 1474 obj->flags &= ~OBJ_TMPFS_DIRTY; 1475 node = VP_TO_TMPFS_NODE(vp); 1476 node->tn_status |= TMPFS_NODE_MODIFIED | 1477 TMPFS_NODE_CHANGED; 1478 } 1479 VM_OBJECT_WUNLOCK(obj); 1480 } 1481 } 1482 1483 /* 1484 * Change flags of the given vnode. 1485 * Caller should execute tmpfs_update on vp after a successful execution. 1486 * The vnode must be locked on entry and remain locked on exit. 1487 */ 1488 int 1489 tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred, 1490 struct thread *p) 1491 { 1492 int error; 1493 struct tmpfs_node *node; 1494 1495 ASSERT_VOP_ELOCKED(vp, "chflags"); 1496 1497 node = VP_TO_TMPFS_NODE(vp); 1498 1499 if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK | 1500 UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP | 1501 UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE | 1502 UF_SPARSE | UF_SYSTEM)) != 0) 1503 return (EOPNOTSUPP); 1504 1505 /* Disallow this operation if the file system is mounted read-only. */ 1506 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1507 return EROFS; 1508 1509 /* 1510 * Callers may only modify the file flags on objects they 1511 * have VADMIN rights for. 1512 */ 1513 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1514 return (error); 1515 /* 1516 * Unprivileged processes are not permitted to unset system 1517 * flags, or modify flags if any system flags are set. 1518 */ 1519 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 1520 if (node->tn_flags & 1521 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 1522 error = securelevel_gt(cred, 0); 1523 if (error) 1524 return (error); 1525 } 1526 } else { 1527 if (node->tn_flags & 1528 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 1529 ((flags ^ node->tn_flags) & SF_SETTABLE)) 1530 return (EPERM); 1531 } 1532 node->tn_flags = flags; 1533 node->tn_status |= TMPFS_NODE_CHANGED; 1534 1535 ASSERT_VOP_ELOCKED(vp, "chflags2"); 1536 1537 return (0); 1538 } 1539 1540 /* 1541 * Change access mode on the given vnode. 1542 * Caller should execute tmpfs_update on vp after a successful execution. 1543 * The vnode must be locked on entry and remain locked on exit. 1544 */ 1545 int 1546 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p) 1547 { 1548 int error; 1549 struct tmpfs_node *node; 1550 1551 ASSERT_VOP_ELOCKED(vp, "chmod"); 1552 1553 node = VP_TO_TMPFS_NODE(vp); 1554 1555 /* Disallow this operation if the file system is mounted read-only. */ 1556 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1557 return EROFS; 1558 1559 /* Immutable or append-only files cannot be modified, either. */ 1560 if (node->tn_flags & (IMMUTABLE | APPEND)) 1561 return EPERM; 1562 1563 /* 1564 * To modify the permissions on a file, must possess VADMIN 1565 * for that file. 1566 */ 1567 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1568 return (error); 1569 1570 /* 1571 * Privileged processes may set the sticky bit on non-directories, 1572 * as well as set the setgid bit on a file with a group that the 1573 * process is not a member of. 1574 */ 1575 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 1576 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 1577 return (EFTYPE); 1578 } 1579 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) { 1580 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 1581 if (error) 1582 return (error); 1583 } 1584 1585 1586 node->tn_mode &= ~ALLPERMS; 1587 node->tn_mode |= mode & ALLPERMS; 1588 1589 node->tn_status |= TMPFS_NODE_CHANGED; 1590 1591 ASSERT_VOP_ELOCKED(vp, "chmod2"); 1592 1593 return (0); 1594 } 1595 1596 /* 1597 * Change ownership of the given vnode. At least one of uid or gid must 1598 * be different than VNOVAL. If one is set to that value, the attribute 1599 * is unchanged. 1600 * Caller should execute tmpfs_update on vp after a successful execution. 1601 * The vnode must be locked on entry and remain locked on exit. 1602 */ 1603 int 1604 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 1605 struct thread *p) 1606 { 1607 int error; 1608 struct tmpfs_node *node; 1609 uid_t ouid; 1610 gid_t ogid; 1611 1612 ASSERT_VOP_ELOCKED(vp, "chown"); 1613 1614 node = VP_TO_TMPFS_NODE(vp); 1615 1616 /* Assign default values if they are unknown. */ 1617 MPASS(uid != VNOVAL || gid != VNOVAL); 1618 if (uid == VNOVAL) 1619 uid = node->tn_uid; 1620 if (gid == VNOVAL) 1621 gid = node->tn_gid; 1622 MPASS(uid != VNOVAL && gid != VNOVAL); 1623 1624 /* Disallow this operation if the file system is mounted read-only. */ 1625 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1626 return EROFS; 1627 1628 /* Immutable or append-only files cannot be modified, either. */ 1629 if (node->tn_flags & (IMMUTABLE | APPEND)) 1630 return EPERM; 1631 1632 /* 1633 * To modify the ownership of a file, must possess VADMIN for that 1634 * file. 1635 */ 1636 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1637 return (error); 1638 1639 /* 1640 * To change the owner of a file, or change the group of a file to a 1641 * group of which we are not a member, the caller must have 1642 * privilege. 1643 */ 1644 if ((uid != node->tn_uid || 1645 (gid != node->tn_gid && !groupmember(gid, cred))) && 1646 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 1647 return (error); 1648 1649 ogid = node->tn_gid; 1650 ouid = node->tn_uid; 1651 1652 node->tn_uid = uid; 1653 node->tn_gid = gid; 1654 1655 node->tn_status |= TMPFS_NODE_CHANGED; 1656 1657 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) { 1658 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) 1659 node->tn_mode &= ~(S_ISUID | S_ISGID); 1660 } 1661 1662 ASSERT_VOP_ELOCKED(vp, "chown2"); 1663 1664 return (0); 1665 } 1666 1667 /* 1668 * Change size of the given vnode. 1669 * Caller should execute tmpfs_update on vp after a successful execution. 1670 * The vnode must be locked on entry and remain locked on exit. 1671 */ 1672 int 1673 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred, 1674 struct thread *p) 1675 { 1676 int error; 1677 struct tmpfs_node *node; 1678 1679 ASSERT_VOP_ELOCKED(vp, "chsize"); 1680 1681 node = VP_TO_TMPFS_NODE(vp); 1682 1683 /* Decide whether this is a valid operation based on the file type. */ 1684 error = 0; 1685 switch (vp->v_type) { 1686 case VDIR: 1687 return EISDIR; 1688 1689 case VREG: 1690 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1691 return EROFS; 1692 break; 1693 1694 case VBLK: 1695 /* FALLTHROUGH */ 1696 case VCHR: 1697 /* FALLTHROUGH */ 1698 case VFIFO: 1699 /* Allow modifications of special files even if in the file 1700 * system is mounted read-only (we are not modifying the 1701 * files themselves, but the objects they represent). */ 1702 return 0; 1703 1704 default: 1705 /* Anything else is unsupported. */ 1706 return EOPNOTSUPP; 1707 } 1708 1709 /* Immutable or append-only files cannot be modified, either. */ 1710 if (node->tn_flags & (IMMUTABLE | APPEND)) 1711 return EPERM; 1712 1713 error = tmpfs_truncate(vp, size); 1714 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1715 * for us, as will update tn_status; no need to do that here. */ 1716 1717 ASSERT_VOP_ELOCKED(vp, "chsize2"); 1718 1719 return (error); 1720 } 1721 1722 /* 1723 * Change access and modification times of the given vnode. 1724 * Caller should execute tmpfs_update on vp after a successful execution. 1725 * The vnode must be locked on entry and remain locked on exit. 1726 */ 1727 int 1728 tmpfs_chtimes(struct vnode *vp, struct vattr *vap, 1729 struct ucred *cred, struct thread *l) 1730 { 1731 int error; 1732 struct tmpfs_node *node; 1733 1734 ASSERT_VOP_ELOCKED(vp, "chtimes"); 1735 1736 node = VP_TO_TMPFS_NODE(vp); 1737 1738 /* Disallow this operation if the file system is mounted read-only. */ 1739 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1740 return EROFS; 1741 1742 /* Immutable or append-only files cannot be modified, either. */ 1743 if (node->tn_flags & (IMMUTABLE | APPEND)) 1744 return EPERM; 1745 1746 error = vn_utimes_perm(vp, vap, cred, l); 1747 if (error != 0) 1748 return (error); 1749 1750 if (vap->va_atime.tv_sec != VNOVAL) 1751 node->tn_status |= TMPFS_NODE_ACCESSED; 1752 1753 if (vap->va_mtime.tv_sec != VNOVAL) 1754 node->tn_status |= TMPFS_NODE_MODIFIED; 1755 1756 if (vap->va_birthtime.tv_sec != VNOVAL) 1757 node->tn_status |= TMPFS_NODE_MODIFIED; 1758 1759 tmpfs_itimes(vp, &vap->va_atime, &vap->va_mtime); 1760 1761 if (vap->va_birthtime.tv_sec != VNOVAL) 1762 node->tn_birthtime = vap->va_birthtime; 1763 ASSERT_VOP_ELOCKED(vp, "chtimes2"); 1764 1765 return (0); 1766 } 1767 1768 void 1769 tmpfs_set_status(struct tmpfs_mount *tm, struct tmpfs_node *node, int status) 1770 { 1771 1772 if ((node->tn_status & status) == status || tm->tm_ronly) 1773 return; 1774 TMPFS_NODE_LOCK(node); 1775 node->tn_status |= status; 1776 TMPFS_NODE_UNLOCK(node); 1777 } 1778 1779 /* Sync timestamps */ 1780 void 1781 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1782 const struct timespec *mod) 1783 { 1784 struct tmpfs_node *node; 1785 struct timespec now; 1786 1787 ASSERT_VOP_LOCKED(vp, "tmpfs_itimes"); 1788 node = VP_TO_TMPFS_NODE(vp); 1789 1790 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1791 TMPFS_NODE_CHANGED)) == 0) 1792 return; 1793 1794 vfs_timestamp(&now); 1795 TMPFS_NODE_LOCK(node); 1796 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1797 if (acc == NULL) 1798 acc = &now; 1799 node->tn_atime = *acc; 1800 } 1801 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1802 if (mod == NULL) 1803 mod = &now; 1804 node->tn_mtime = *mod; 1805 } 1806 if (node->tn_status & TMPFS_NODE_CHANGED) 1807 node->tn_ctime = now; 1808 node->tn_status &= ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1809 TMPFS_NODE_CHANGED); 1810 TMPFS_NODE_UNLOCK(node); 1811 1812 /* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */ 1813 random_harvest_queue(node, sizeof(*node), 1, RANDOM_FS_ATIME); 1814 } 1815 1816 void 1817 tmpfs_update(struct vnode *vp) 1818 { 1819 1820 tmpfs_itimes(vp, NULL, NULL); 1821 } 1822 1823 int 1824 tmpfs_truncate(struct vnode *vp, off_t length) 1825 { 1826 int error; 1827 struct tmpfs_node *node; 1828 1829 node = VP_TO_TMPFS_NODE(vp); 1830 1831 if (length < 0) { 1832 error = EINVAL; 1833 goto out; 1834 } 1835 1836 if (node->tn_size == length) { 1837 error = 0; 1838 goto out; 1839 } 1840 1841 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1842 return (EFBIG); 1843 1844 error = tmpfs_reg_resize(vp, length, FALSE); 1845 if (error == 0) 1846 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1847 1848 out: 1849 tmpfs_update(vp); 1850 1851 return (error); 1852 } 1853 1854 static __inline int 1855 tmpfs_dirtree_cmp(struct tmpfs_dirent *a, struct tmpfs_dirent *b) 1856 { 1857 if (a->td_hash > b->td_hash) 1858 return (1); 1859 else if (a->td_hash < b->td_hash) 1860 return (-1); 1861 return (0); 1862 } 1863 1864 RB_GENERATE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);
Cache object: 29e9d895ecd335e80cef867edfab85b6
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