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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 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2005 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 11 * 2005 program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * Efficient memory file system supporting functions. 37 */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/12.0/sys/fs/tmpfs/tmpfs_subr.c 341085 2018-11-27 17:58:25Z markj $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/dirent.h> 44 #include <sys/fnv_hash.h> 45 #include <sys/lock.h> 46 #include <sys/limits.h> 47 #include <sys/mount.h> 48 #include <sys/namei.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/random.h> 52 #include <sys/rwlock.h> 53 #include <sys/stat.h> 54 #include <sys/sysctl.h> 55 #include <sys/vnode.h> 56 #include <sys/vmmeter.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_param.h> 60 #include <vm/vm_object.h> 61 #include <vm/vm_page.h> 62 #include <vm/vm_pageout.h> 63 #include <vm/vm_pager.h> 64 #include <vm/vm_extern.h> 65 #include <vm/swap_pager.h> 66 67 #include <fs/tmpfs/tmpfs.h> 68 #include <fs/tmpfs/tmpfs_fifoops.h> 69 #include <fs/tmpfs/tmpfs_vnops.h> 70 71 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system"); 72 73 static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED; 74 75 static int 76 sysctl_mem_reserved(SYSCTL_HANDLER_ARGS) 77 { 78 int error; 79 long pages, bytes; 80 81 pages = *(long *)arg1; 82 bytes = pages * PAGE_SIZE; 83 84 error = sysctl_handle_long(oidp, &bytes, 0, req); 85 if (error || !req->newptr) 86 return (error); 87 88 pages = bytes / PAGE_SIZE; 89 if (pages < TMPFS_PAGES_MINRESERVED) 90 return (EINVAL); 91 92 *(long *)arg1 = pages; 93 return (0); 94 } 95 96 SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW, 97 &tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L", 98 "Amount of available memory and swap below which tmpfs growth stops"); 99 100 static __inline int tmpfs_dirtree_cmp(struct tmpfs_dirent *a, 101 struct tmpfs_dirent *b); 102 RB_PROTOTYPE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp); 103 104 size_t 105 tmpfs_mem_avail(void) 106 { 107 vm_ooffset_t avail; 108 109 avail = swap_pager_avail + vm_free_count() - tmpfs_pages_reserved; 110 if (__predict_false(avail < 0)) 111 avail = 0; 112 return (avail); 113 } 114 115 size_t 116 tmpfs_pages_used(struct tmpfs_mount *tmp) 117 { 118 const size_t node_size = sizeof(struct tmpfs_node) + 119 sizeof(struct tmpfs_dirent); 120 size_t meta_pages; 121 122 meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size, 123 PAGE_SIZE); 124 return (meta_pages + tmp->tm_pages_used); 125 } 126 127 static size_t 128 tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages) 129 { 130 if (tmpfs_mem_avail() < req_pages) 131 return (0); 132 133 if (tmp->tm_pages_max != ULONG_MAX && 134 tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp)) 135 return (0); 136 137 return (1); 138 } 139 140 void 141 tmpfs_ref_node(struct tmpfs_node *node) 142 { 143 144 TMPFS_NODE_LOCK(node); 145 tmpfs_ref_node_locked(node); 146 TMPFS_NODE_UNLOCK(node); 147 } 148 149 void 150 tmpfs_ref_node_locked(struct tmpfs_node *node) 151 { 152 153 TMPFS_NODE_ASSERT_LOCKED(node); 154 KASSERT(node->tn_refcount > 0, ("node %p zero refcount", node)); 155 KASSERT(node->tn_refcount < UINT_MAX, ("node %p refcount %u", node, 156 node->tn_refcount)); 157 node->tn_refcount++; 158 } 159 160 /* 161 * Allocates a new node of type 'type' inside the 'tmp' mount point, with 162 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode', 163 * using the credentials of the process 'p'. 164 * 165 * If the node type is set to 'VDIR', then the parent parameter must point 166 * to the parent directory of the node being created. It may only be NULL 167 * while allocating the root node. 168 * 169 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter 170 * specifies the device the node represents. 171 * 172 * If the node type is set to 'VLNK', then the parameter target specifies 173 * the file name of the target file for the symbolic link that is being 174 * created. 175 * 176 * Note that new nodes are retrieved from the available list if it has 177 * items or, if it is empty, from the node pool as long as there is enough 178 * space to create them. 179 * 180 * Returns zero on success or an appropriate error code on failure. 181 */ 182 int 183 tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *tmp, enum vtype type, 184 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent, 185 char *target, dev_t rdev, struct tmpfs_node **node) 186 { 187 struct tmpfs_node *nnode; 188 vm_object_t obj; 189 190 /* If the root directory of the 'tmp' file system is not yet 191 * allocated, this must be the request to do it. */ 192 MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR)); 193 KASSERT(tmp->tm_root == NULL || mp->mnt_writeopcount > 0, 194 ("creating node not under vn_start_write")); 195 196 MPASS(IFF(type == VLNK, target != NULL)); 197 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL)); 198 199 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max) 200 return (ENOSPC); 201 if (tmpfs_pages_check_avail(tmp, 1) == 0) 202 return (ENOSPC); 203 204 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 205 /* 206 * When a new tmpfs node is created for fully 207 * constructed mount point, there must be a parent 208 * node, which vnode is locked exclusively. As 209 * consequence, if the unmount is executing in 210 * parallel, vflush() cannot reclaim the parent vnode. 211 * Due to this, the check for MNTK_UNMOUNT flag is not 212 * racy: if we did not see MNTK_UNMOUNT flag, then tmp 213 * cannot be destroyed until node construction is 214 * finished and the parent vnode unlocked. 215 * 216 * Tmpfs does not need to instantiate new nodes during 217 * unmount. 218 */ 219 return (EBUSY); 220 } 221 222 nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp, 223 M_WAITOK); 224 225 /* Generic initialization. */ 226 nnode->tn_type = type; 227 vfs_timestamp(&nnode->tn_atime); 228 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime = 229 nnode->tn_atime; 230 nnode->tn_uid = uid; 231 nnode->tn_gid = gid; 232 nnode->tn_mode = mode; 233 nnode->tn_id = alloc_unr(tmp->tm_ino_unr); 234 nnode->tn_refcount = 1; 235 236 /* Type-specific initialization. */ 237 switch (nnode->tn_type) { 238 case VBLK: 239 case VCHR: 240 nnode->tn_rdev = rdev; 241 break; 242 243 case VDIR: 244 RB_INIT(&nnode->tn_dir.tn_dirhead); 245 LIST_INIT(&nnode->tn_dir.tn_dupindex); 246 MPASS(parent != nnode); 247 MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL)); 248 nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent; 249 nnode->tn_dir.tn_readdir_lastn = 0; 250 nnode->tn_dir.tn_readdir_lastp = NULL; 251 nnode->tn_links++; 252 TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent); 253 nnode->tn_dir.tn_parent->tn_links++; 254 TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent); 255 break; 256 257 case VFIFO: 258 /* FALLTHROUGH */ 259 case VSOCK: 260 break; 261 262 case VLNK: 263 MPASS(strlen(target) < MAXPATHLEN); 264 nnode->tn_size = strlen(target); 265 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME, 266 M_WAITOK); 267 memcpy(nnode->tn_link, target, nnode->tn_size); 268 break; 269 270 case VREG: 271 obj = nnode->tn_reg.tn_aobj = 272 vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0, 273 NULL /* XXXKIB - tmpfs needs swap reservation */); 274 VM_OBJECT_WLOCK(obj); 275 /* OBJ_TMPFS is set together with the setting of vp->v_object */ 276 vm_object_set_flag(obj, OBJ_NOSPLIT | OBJ_TMPFS_NODE); 277 vm_object_clear_flag(obj, OBJ_ONEMAPPING); 278 VM_OBJECT_WUNLOCK(obj); 279 break; 280 281 default: 282 panic("tmpfs_alloc_node: type %p %d", nnode, 283 (int)nnode->tn_type); 284 } 285 286 TMPFS_LOCK(tmp); 287 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries); 288 nnode->tn_attached = true; 289 tmp->tm_nodes_inuse++; 290 tmp->tm_refcount++; 291 TMPFS_UNLOCK(tmp); 292 293 *node = nnode; 294 return (0); 295 } 296 297 /* 298 * Destroys the node pointed to by node from the file system 'tmp'. 299 * If the node references a directory, no entries are allowed. 300 */ 301 void 302 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node) 303 { 304 305 TMPFS_LOCK(tmp); 306 TMPFS_NODE_LOCK(node); 307 if (!tmpfs_free_node_locked(tmp, node, false)) { 308 TMPFS_NODE_UNLOCK(node); 309 TMPFS_UNLOCK(tmp); 310 } 311 } 312 313 bool 314 tmpfs_free_node_locked(struct tmpfs_mount *tmp, struct tmpfs_node *node, 315 bool detach) 316 { 317 vm_object_t uobj; 318 319 TMPFS_MP_ASSERT_LOCKED(tmp); 320 TMPFS_NODE_ASSERT_LOCKED(node); 321 KASSERT(node->tn_refcount > 0, ("node %p refcount zero", node)); 322 323 node->tn_refcount--; 324 if (node->tn_attached && (detach || node->tn_refcount == 0)) { 325 MPASS(tmp->tm_nodes_inuse > 0); 326 tmp->tm_nodes_inuse--; 327 LIST_REMOVE(node, tn_entries); 328 node->tn_attached = false; 329 } 330 if (node->tn_refcount > 0) 331 return (false); 332 333 #ifdef INVARIANTS 334 MPASS(node->tn_vnode == NULL); 335 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0); 336 #endif 337 TMPFS_NODE_UNLOCK(node); 338 TMPFS_UNLOCK(tmp); 339 340 switch (node->tn_type) { 341 case VBLK: 342 /* FALLTHROUGH */ 343 case VCHR: 344 /* FALLTHROUGH */ 345 case VDIR: 346 /* FALLTHROUGH */ 347 case VFIFO: 348 /* FALLTHROUGH */ 349 case VSOCK: 350 break; 351 352 case VLNK: 353 free(node->tn_link, M_TMPFSNAME); 354 break; 355 356 case VREG: 357 uobj = node->tn_reg.tn_aobj; 358 if (uobj != NULL) { 359 if (uobj->size != 0) 360 atomic_subtract_long(&tmp->tm_pages_used, uobj->size); 361 KASSERT((uobj->flags & OBJ_TMPFS) == 0, 362 ("leaked OBJ_TMPFS node %p vm_obj %p", node, uobj)); 363 vm_object_deallocate(uobj); 364 } 365 break; 366 367 default: 368 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type); 369 } 370 371 /* 372 * If we are unmounting there is no need for going through the overhead 373 * of freeing the inodes from the unr individually, so free them all in 374 * one go later. 375 */ 376 if (!detach) 377 free_unr(tmp->tm_ino_unr, node->tn_id); 378 uma_zfree(tmp->tm_node_pool, node); 379 TMPFS_LOCK(tmp); 380 tmpfs_free_tmp(tmp); 381 return (true); 382 } 383 384 static __inline uint32_t 385 tmpfs_dirent_hash(const char *name, u_int len) 386 { 387 uint32_t hash; 388 389 hash = fnv_32_buf(name, len, FNV1_32_INIT + len) & TMPFS_DIRCOOKIE_MASK; 390 #ifdef TMPFS_DEBUG_DIRCOOKIE_DUP 391 hash &= 0xf; 392 #endif 393 if (hash < TMPFS_DIRCOOKIE_MIN) 394 hash += TMPFS_DIRCOOKIE_MIN; 395 396 return (hash); 397 } 398 399 static __inline off_t 400 tmpfs_dirent_cookie(struct tmpfs_dirent *de) 401 { 402 if (de == NULL) 403 return (TMPFS_DIRCOOKIE_EOF); 404 405 MPASS(de->td_cookie >= TMPFS_DIRCOOKIE_MIN); 406 407 return (de->td_cookie); 408 } 409 410 static __inline boolean_t 411 tmpfs_dirent_dup(struct tmpfs_dirent *de) 412 { 413 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUP) != 0); 414 } 415 416 static __inline boolean_t 417 tmpfs_dirent_duphead(struct tmpfs_dirent *de) 418 { 419 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUPHEAD) != 0); 420 } 421 422 void 423 tmpfs_dirent_init(struct tmpfs_dirent *de, const char *name, u_int namelen) 424 { 425 de->td_hash = de->td_cookie = tmpfs_dirent_hash(name, namelen); 426 memcpy(de->ud.td_name, name, namelen); 427 de->td_namelen = namelen; 428 } 429 430 /* 431 * Allocates a new directory entry for the node node with a name of name. 432 * The new directory entry is returned in *de. 433 * 434 * The link count of node is increased by one to reflect the new object 435 * referencing it. 436 * 437 * Returns zero on success or an appropriate error code on failure. 438 */ 439 int 440 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node, 441 const char *name, u_int len, struct tmpfs_dirent **de) 442 { 443 struct tmpfs_dirent *nde; 444 445 nde = uma_zalloc(tmp->tm_dirent_pool, M_WAITOK); 446 nde->td_node = node; 447 if (name != NULL) { 448 nde->ud.td_name = malloc(len, M_TMPFSNAME, M_WAITOK); 449 tmpfs_dirent_init(nde, name, len); 450 } else 451 nde->td_namelen = 0; 452 if (node != NULL) 453 node->tn_links++; 454 455 *de = nde; 456 457 return 0; 458 } 459 460 /* 461 * Frees a directory entry. It is the caller's responsibility to destroy 462 * the node referenced by it if needed. 463 * 464 * The link count of node is decreased by one to reflect the removal of an 465 * object that referenced it. This only happens if 'node_exists' is true; 466 * otherwise the function will not access the node referred to by the 467 * directory entry, as it may already have been released from the outside. 468 */ 469 void 470 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de) 471 { 472 struct tmpfs_node *node; 473 474 node = de->td_node; 475 if (node != NULL) { 476 MPASS(node->tn_links > 0); 477 node->tn_links--; 478 } 479 if (!tmpfs_dirent_duphead(de) && de->ud.td_name != NULL) 480 free(de->ud.td_name, M_TMPFSNAME); 481 uma_zfree(tmp->tm_dirent_pool, de); 482 } 483 484 void 485 tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj) 486 { 487 488 ASSERT_VOP_ELOCKED(vp, "tmpfs_destroy_vobject"); 489 if (vp->v_type != VREG || obj == NULL) 490 return; 491 492 VM_OBJECT_WLOCK(obj); 493 VI_LOCK(vp); 494 vm_object_clear_flag(obj, OBJ_TMPFS); 495 obj->un_pager.swp.swp_tmpfs = NULL; 496 VI_UNLOCK(vp); 497 VM_OBJECT_WUNLOCK(obj); 498 } 499 500 /* 501 * Need to clear v_object for insmntque failure. 502 */ 503 static void 504 tmpfs_insmntque_dtr(struct vnode *vp, void *dtr_arg) 505 { 506 507 tmpfs_destroy_vobject(vp, vp->v_object); 508 vp->v_object = NULL; 509 vp->v_data = NULL; 510 vp->v_op = &dead_vnodeops; 511 vgone(vp); 512 vput(vp); 513 } 514 515 /* 516 * Allocates a new vnode for the node node or returns a new reference to 517 * an existing one if the node had already a vnode referencing it. The 518 * resulting locked vnode is returned in *vpp. 519 * 520 * Returns zero on success or an appropriate error code on failure. 521 */ 522 int 523 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag, 524 struct vnode **vpp) 525 { 526 struct vnode *vp; 527 struct tmpfs_mount *tm; 528 vm_object_t object; 529 int error; 530 531 error = 0; 532 tm = VFS_TO_TMPFS(mp); 533 TMPFS_NODE_LOCK(node); 534 tmpfs_ref_node_locked(node); 535 loop: 536 TMPFS_NODE_ASSERT_LOCKED(node); 537 if ((vp = node->tn_vnode) != NULL) { 538 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0); 539 VI_LOCK(vp); 540 if ((node->tn_type == VDIR && node->tn_dir.tn_parent == NULL) || 541 ((vp->v_iflag & VI_DOOMED) != 0 && 542 (lkflag & LK_NOWAIT) != 0)) { 543 VI_UNLOCK(vp); 544 TMPFS_NODE_UNLOCK(node); 545 error = ENOENT; 546 vp = NULL; 547 goto out; 548 } 549 if ((vp->v_iflag & VI_DOOMED) != 0) { 550 VI_UNLOCK(vp); 551 node->tn_vpstate |= TMPFS_VNODE_WRECLAIM; 552 while ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) { 553 msleep(&node->tn_vnode, TMPFS_NODE_MTX(node), 554 0, "tmpfsE", 0); 555 } 556 goto loop; 557 } 558 TMPFS_NODE_UNLOCK(node); 559 error = vget(vp, lkflag | LK_INTERLOCK, curthread); 560 if (error == ENOENT) { 561 TMPFS_NODE_LOCK(node); 562 goto loop; 563 } 564 if (error != 0) { 565 vp = NULL; 566 goto out; 567 } 568 569 /* 570 * Make sure the vnode is still there after 571 * getting the interlock to avoid racing a free. 572 */ 573 if (node->tn_vnode == NULL || node->tn_vnode != vp) { 574 vput(vp); 575 TMPFS_NODE_LOCK(node); 576 goto loop; 577 } 578 579 goto out; 580 } 581 582 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) || 583 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) { 584 TMPFS_NODE_UNLOCK(node); 585 error = ENOENT; 586 vp = NULL; 587 goto out; 588 } 589 590 /* 591 * otherwise lock the vp list while we call getnewvnode 592 * since that can block. 593 */ 594 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) { 595 node->tn_vpstate |= TMPFS_VNODE_WANT; 596 error = msleep((caddr_t) &node->tn_vpstate, 597 TMPFS_NODE_MTX(node), 0, "tmpfs_alloc_vp", 0); 598 if (error != 0) 599 goto out; 600 goto loop; 601 } else 602 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING; 603 604 TMPFS_NODE_UNLOCK(node); 605 606 /* Get a new vnode and associate it with our node. */ 607 error = getnewvnode("tmpfs", mp, VFS_TO_TMPFS(mp)->tm_nonc ? 608 &tmpfs_vnodeop_nonc_entries : &tmpfs_vnodeop_entries, &vp); 609 if (error != 0) 610 goto unlock; 611 MPASS(vp != NULL); 612 613 /* lkflag is ignored, the lock is exclusive */ 614 (void) vn_lock(vp, lkflag | LK_RETRY); 615 616 vp->v_data = node; 617 vp->v_type = node->tn_type; 618 619 /* Type-specific initialization. */ 620 switch (node->tn_type) { 621 case VBLK: 622 /* FALLTHROUGH */ 623 case VCHR: 624 /* FALLTHROUGH */ 625 case VLNK: 626 /* FALLTHROUGH */ 627 case VSOCK: 628 break; 629 case VFIFO: 630 vp->v_op = &tmpfs_fifoop_entries; 631 break; 632 case VREG: 633 object = node->tn_reg.tn_aobj; 634 VM_OBJECT_WLOCK(object); 635 VI_LOCK(vp); 636 KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs")); 637 vp->v_object = object; 638 object->un_pager.swp.swp_tmpfs = vp; 639 vm_object_set_flag(object, OBJ_TMPFS); 640 VI_UNLOCK(vp); 641 VM_OBJECT_WUNLOCK(object); 642 break; 643 case VDIR: 644 MPASS(node->tn_dir.tn_parent != NULL); 645 if (node->tn_dir.tn_parent == node) 646 vp->v_vflag |= VV_ROOT; 647 break; 648 649 default: 650 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type); 651 } 652 if (vp->v_type != VFIFO) 653 VN_LOCK_ASHARE(vp); 654 655 error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL); 656 if (error != 0) 657 vp = NULL; 658 659 unlock: 660 TMPFS_NODE_LOCK(node); 661 662 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING); 663 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING; 664 node->tn_vnode = vp; 665 666 if (node->tn_vpstate & TMPFS_VNODE_WANT) { 667 node->tn_vpstate &= ~TMPFS_VNODE_WANT; 668 TMPFS_NODE_UNLOCK(node); 669 wakeup((caddr_t) &node->tn_vpstate); 670 } else 671 TMPFS_NODE_UNLOCK(node); 672 673 out: 674 if (error == 0) { 675 *vpp = vp; 676 677 #ifdef INVARIANTS 678 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp)); 679 TMPFS_NODE_LOCK(node); 680 MPASS(*vpp == node->tn_vnode); 681 TMPFS_NODE_UNLOCK(node); 682 #endif 683 } 684 tmpfs_free_node(tm, node); 685 686 return (error); 687 } 688 689 /* 690 * Destroys the association between the vnode vp and the node it 691 * references. 692 */ 693 void 694 tmpfs_free_vp(struct vnode *vp) 695 { 696 struct tmpfs_node *node; 697 698 node = VP_TO_TMPFS_NODE(vp); 699 700 TMPFS_NODE_ASSERT_LOCKED(node); 701 node->tn_vnode = NULL; 702 if ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) 703 wakeup(&node->tn_vnode); 704 node->tn_vpstate &= ~TMPFS_VNODE_WRECLAIM; 705 vp->v_data = NULL; 706 } 707 708 /* 709 * Allocates a new file of type 'type' and adds it to the parent directory 710 * 'dvp'; this addition is done using the component name given in 'cnp'. 711 * The ownership of the new file is automatically assigned based on the 712 * credentials of the caller (through 'cnp'), the group is set based on 713 * the parent directory and the mode is determined from the 'vap' argument. 714 * If successful, *vpp holds a vnode to the newly created file and zero 715 * is returned. Otherwise *vpp is NULL and the function returns an 716 * appropriate error code. 717 */ 718 int 719 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, 720 struct componentname *cnp, char *target) 721 { 722 int error; 723 struct tmpfs_dirent *de; 724 struct tmpfs_mount *tmp; 725 struct tmpfs_node *dnode; 726 struct tmpfs_node *node; 727 struct tmpfs_node *parent; 728 729 ASSERT_VOP_ELOCKED(dvp, "tmpfs_alloc_file"); 730 MPASS(cnp->cn_flags & HASBUF); 731 732 tmp = VFS_TO_TMPFS(dvp->v_mount); 733 dnode = VP_TO_TMPFS_DIR(dvp); 734 *vpp = NULL; 735 736 /* If the entry we are creating is a directory, we cannot overflow 737 * the number of links of its parent, because it will get a new 738 * link. */ 739 if (vap->va_type == VDIR) { 740 /* Ensure that we do not overflow the maximum number of links 741 * imposed by the system. */ 742 MPASS(dnode->tn_links <= TMPFS_LINK_MAX); 743 if (dnode->tn_links == TMPFS_LINK_MAX) { 744 return (EMLINK); 745 } 746 747 parent = dnode; 748 MPASS(parent != NULL); 749 } else 750 parent = NULL; 751 752 /* Allocate a node that represents the new file. */ 753 error = tmpfs_alloc_node(dvp->v_mount, tmp, vap->va_type, 754 cnp->cn_cred->cr_uid, dnode->tn_gid, vap->va_mode, parent, 755 target, vap->va_rdev, &node); 756 if (error != 0) 757 return (error); 758 759 /* Allocate a directory entry that points to the new file. */ 760 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen, 761 &de); 762 if (error != 0) { 763 tmpfs_free_node(tmp, node); 764 return (error); 765 } 766 767 /* Allocate a vnode for the new file. */ 768 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp); 769 if (error != 0) { 770 tmpfs_free_dirent(tmp, de); 771 tmpfs_free_node(tmp, node); 772 return (error); 773 } 774 775 /* Now that all required items are allocated, we can proceed to 776 * insert the new node into the directory, an operation that 777 * cannot fail. */ 778 if (cnp->cn_flags & ISWHITEOUT) 779 tmpfs_dir_whiteout_remove(dvp, cnp); 780 tmpfs_dir_attach(dvp, de); 781 return (0); 782 } 783 784 struct tmpfs_dirent * 785 tmpfs_dir_first(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc) 786 { 787 struct tmpfs_dirent *de; 788 789 de = RB_MIN(tmpfs_dir, &dnode->tn_dir.tn_dirhead); 790 dc->tdc_tree = de; 791 if (de != NULL && tmpfs_dirent_duphead(de)) 792 de = LIST_FIRST(&de->ud.td_duphead); 793 dc->tdc_current = de; 794 795 return (dc->tdc_current); 796 } 797 798 struct tmpfs_dirent * 799 tmpfs_dir_next(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc) 800 { 801 struct tmpfs_dirent *de; 802 803 MPASS(dc->tdc_tree != NULL); 804 if (tmpfs_dirent_dup(dc->tdc_current)) { 805 dc->tdc_current = LIST_NEXT(dc->tdc_current, uh.td_dup.entries); 806 if (dc->tdc_current != NULL) 807 return (dc->tdc_current); 808 } 809 dc->tdc_tree = dc->tdc_current = RB_NEXT(tmpfs_dir, 810 &dnode->tn_dir.tn_dirhead, dc->tdc_tree); 811 if ((de = dc->tdc_current) != NULL && tmpfs_dirent_duphead(de)) { 812 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead); 813 MPASS(dc->tdc_current != NULL); 814 } 815 816 return (dc->tdc_current); 817 } 818 819 /* Lookup directory entry in RB-Tree. Function may return duphead entry. */ 820 static struct tmpfs_dirent * 821 tmpfs_dir_xlookup_hash(struct tmpfs_node *dnode, uint32_t hash) 822 { 823 struct tmpfs_dirent *de, dekey; 824 825 dekey.td_hash = hash; 826 de = RB_FIND(tmpfs_dir, &dnode->tn_dir.tn_dirhead, &dekey); 827 return (de); 828 } 829 830 /* Lookup directory entry by cookie, initialize directory cursor accordingly. */ 831 static struct tmpfs_dirent * 832 tmpfs_dir_lookup_cookie(struct tmpfs_node *node, off_t cookie, 833 struct tmpfs_dir_cursor *dc) 834 { 835 struct tmpfs_dir *dirhead = &node->tn_dir.tn_dirhead; 836 struct tmpfs_dirent *de, dekey; 837 838 MPASS(cookie >= TMPFS_DIRCOOKIE_MIN); 839 840 if (cookie == node->tn_dir.tn_readdir_lastn && 841 (de = node->tn_dir.tn_readdir_lastp) != NULL) { 842 /* Protect against possible race, tn_readdir_last[pn] 843 * may be updated with only shared vnode lock held. */ 844 if (cookie == tmpfs_dirent_cookie(de)) 845 goto out; 846 } 847 848 if ((cookie & TMPFS_DIRCOOKIE_DUP) != 0) { 849 LIST_FOREACH(de, &node->tn_dir.tn_dupindex, 850 uh.td_dup.index_entries) { 851 MPASS(tmpfs_dirent_dup(de)); 852 if (de->td_cookie == cookie) 853 goto out; 854 /* dupindex list is sorted. */ 855 if (de->td_cookie < cookie) { 856 de = NULL; 857 goto out; 858 } 859 } 860 MPASS(de == NULL); 861 goto out; 862 } 863 864 if ((cookie & TMPFS_DIRCOOKIE_MASK) != cookie) { 865 de = NULL; 866 } else { 867 dekey.td_hash = cookie; 868 /* Recover if direntry for cookie was removed */ 869 de = RB_NFIND(tmpfs_dir, dirhead, &dekey); 870 } 871 dc->tdc_tree = de; 872 dc->tdc_current = de; 873 if (de != NULL && tmpfs_dirent_duphead(de)) { 874 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead); 875 MPASS(dc->tdc_current != NULL); 876 } 877 return (dc->tdc_current); 878 879 out: 880 dc->tdc_tree = de; 881 dc->tdc_current = de; 882 if (de != NULL && tmpfs_dirent_dup(de)) 883 dc->tdc_tree = tmpfs_dir_xlookup_hash(node, 884 de->td_hash); 885 return (dc->tdc_current); 886 } 887 888 /* 889 * Looks for a directory entry in the directory represented by node. 890 * 'cnp' describes the name of the entry to look for. Note that the . 891 * and .. components are not allowed as they do not physically exist 892 * within directories. 893 * 894 * Returns a pointer to the entry when found, otherwise NULL. 895 */ 896 struct tmpfs_dirent * 897 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f, 898 struct componentname *cnp) 899 { 900 struct tmpfs_dir_duphead *duphead; 901 struct tmpfs_dirent *de; 902 uint32_t hash; 903 904 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.')); 905 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' && 906 cnp->cn_nameptr[1] == '.'))); 907 TMPFS_VALIDATE_DIR(node); 908 909 hash = tmpfs_dirent_hash(cnp->cn_nameptr, cnp->cn_namelen); 910 de = tmpfs_dir_xlookup_hash(node, hash); 911 if (de != NULL && tmpfs_dirent_duphead(de)) { 912 duphead = &de->ud.td_duphead; 913 LIST_FOREACH(de, duphead, uh.td_dup.entries) { 914 if (TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr, 915 cnp->cn_namelen)) 916 break; 917 } 918 } else if (de != NULL) { 919 if (!TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr, 920 cnp->cn_namelen)) 921 de = NULL; 922 } 923 if (de != NULL && f != NULL && de->td_node != f) 924 de = NULL; 925 926 return (de); 927 } 928 929 /* 930 * Attach duplicate-cookie directory entry nde to dnode and insert to dupindex 931 * list, allocate new cookie value. 932 */ 933 static void 934 tmpfs_dir_attach_dup(struct tmpfs_node *dnode, 935 struct tmpfs_dir_duphead *duphead, struct tmpfs_dirent *nde) 936 { 937 struct tmpfs_dir_duphead *dupindex; 938 struct tmpfs_dirent *de, *pde; 939 940 dupindex = &dnode->tn_dir.tn_dupindex; 941 de = LIST_FIRST(dupindex); 942 if (de == NULL || de->td_cookie < TMPFS_DIRCOOKIE_DUP_MAX) { 943 if (de == NULL) 944 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN; 945 else 946 nde->td_cookie = de->td_cookie + 1; 947 MPASS(tmpfs_dirent_dup(nde)); 948 LIST_INSERT_HEAD(dupindex, nde, uh.td_dup.index_entries); 949 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 950 return; 951 } 952 953 /* 954 * Cookie numbers are near exhaustion. Scan dupindex list for unused 955 * numbers. dupindex list is sorted in descending order. Keep it so 956 * after inserting nde. 957 */ 958 while (1) { 959 pde = de; 960 de = LIST_NEXT(de, uh.td_dup.index_entries); 961 if (de == NULL && pde->td_cookie != TMPFS_DIRCOOKIE_DUP_MIN) { 962 /* 963 * Last element of the index doesn't have minimal cookie 964 * value, use it. 965 */ 966 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN; 967 LIST_INSERT_AFTER(pde, nde, uh.td_dup.index_entries); 968 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 969 return; 970 } else if (de == NULL) { 971 /* 972 * We are so lucky have 2^30 hash duplicates in single 973 * directory :) Return largest possible cookie value. 974 * It should be fine except possible issues with 975 * VOP_READDIR restart. 976 */ 977 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MAX; 978 LIST_INSERT_HEAD(dupindex, nde, 979 uh.td_dup.index_entries); 980 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 981 return; 982 } 983 if (de->td_cookie + 1 == pde->td_cookie || 984 de->td_cookie >= TMPFS_DIRCOOKIE_DUP_MAX) 985 continue; /* No hole or invalid cookie. */ 986 nde->td_cookie = de->td_cookie + 1; 987 MPASS(tmpfs_dirent_dup(nde)); 988 MPASS(pde->td_cookie > nde->td_cookie); 989 MPASS(nde->td_cookie > de->td_cookie); 990 LIST_INSERT_BEFORE(de, nde, uh.td_dup.index_entries); 991 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries); 992 return; 993 } 994 } 995 996 /* 997 * Attaches the directory entry de to the directory represented by vp. 998 * Note that this does not change the link count of the node pointed by 999 * the directory entry, as this is done by tmpfs_alloc_dirent. 1000 */ 1001 void 1002 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de) 1003 { 1004 struct tmpfs_node *dnode; 1005 struct tmpfs_dirent *xde, *nde; 1006 1007 ASSERT_VOP_ELOCKED(vp, __func__); 1008 MPASS(de->td_namelen > 0); 1009 MPASS(de->td_hash >= TMPFS_DIRCOOKIE_MIN); 1010 MPASS(de->td_cookie == de->td_hash); 1011 1012 dnode = VP_TO_TMPFS_DIR(vp); 1013 dnode->tn_dir.tn_readdir_lastn = 0; 1014 dnode->tn_dir.tn_readdir_lastp = NULL; 1015 1016 MPASS(!tmpfs_dirent_dup(de)); 1017 xde = RB_INSERT(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de); 1018 if (xde != NULL && tmpfs_dirent_duphead(xde)) 1019 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de); 1020 else if (xde != NULL) { 1021 /* 1022 * Allocate new duphead. Swap xde with duphead to avoid 1023 * adding/removing elements with the same hash. 1024 */ 1025 MPASS(!tmpfs_dirent_dup(xde)); 1026 tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), NULL, NULL, 0, 1027 &nde); 1028 /* *nde = *xde; XXX gcc 4.2.1 may generate invalid code. */ 1029 memcpy(nde, xde, sizeof(*xde)); 1030 xde->td_cookie |= TMPFS_DIRCOOKIE_DUPHEAD; 1031 LIST_INIT(&xde->ud.td_duphead); 1032 xde->td_namelen = 0; 1033 xde->td_node = NULL; 1034 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, nde); 1035 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de); 1036 } 1037 dnode->tn_size += sizeof(struct tmpfs_dirent); 1038 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1039 TMPFS_NODE_MODIFIED; 1040 tmpfs_update(vp); 1041 } 1042 1043 /* 1044 * Detaches the directory entry de from the directory represented by vp. 1045 * Note that this does not change the link count of the node pointed by 1046 * the directory entry, as this is done by tmpfs_free_dirent. 1047 */ 1048 void 1049 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de) 1050 { 1051 struct tmpfs_mount *tmp; 1052 struct tmpfs_dir *head; 1053 struct tmpfs_node *dnode; 1054 struct tmpfs_dirent *xde; 1055 1056 ASSERT_VOP_ELOCKED(vp, __func__); 1057 1058 dnode = VP_TO_TMPFS_DIR(vp); 1059 head = &dnode->tn_dir.tn_dirhead; 1060 dnode->tn_dir.tn_readdir_lastn = 0; 1061 dnode->tn_dir.tn_readdir_lastp = NULL; 1062 1063 if (tmpfs_dirent_dup(de)) { 1064 /* Remove duphead if de was last entry. */ 1065 if (LIST_NEXT(de, uh.td_dup.entries) == NULL) { 1066 xde = tmpfs_dir_xlookup_hash(dnode, de->td_hash); 1067 MPASS(tmpfs_dirent_duphead(xde)); 1068 } else 1069 xde = NULL; 1070 LIST_REMOVE(de, uh.td_dup.entries); 1071 LIST_REMOVE(de, uh.td_dup.index_entries); 1072 if (xde != NULL) { 1073 if (LIST_EMPTY(&xde->ud.td_duphead)) { 1074 RB_REMOVE(tmpfs_dir, head, xde); 1075 tmp = VFS_TO_TMPFS(vp->v_mount); 1076 MPASS(xde->td_node == NULL); 1077 tmpfs_free_dirent(tmp, xde); 1078 } 1079 } 1080 de->td_cookie = de->td_hash; 1081 } else 1082 RB_REMOVE(tmpfs_dir, head, de); 1083 1084 dnode->tn_size -= sizeof(struct tmpfs_dirent); 1085 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1086 TMPFS_NODE_MODIFIED; 1087 tmpfs_update(vp); 1088 } 1089 1090 void 1091 tmpfs_dir_destroy(struct tmpfs_mount *tmp, struct tmpfs_node *dnode) 1092 { 1093 struct tmpfs_dirent *de, *dde, *nde; 1094 1095 RB_FOREACH_SAFE(de, tmpfs_dir, &dnode->tn_dir.tn_dirhead, nde) { 1096 RB_REMOVE(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de); 1097 /* Node may already be destroyed. */ 1098 de->td_node = NULL; 1099 if (tmpfs_dirent_duphead(de)) { 1100 while ((dde = LIST_FIRST(&de->ud.td_duphead)) != NULL) { 1101 LIST_REMOVE(dde, uh.td_dup.entries); 1102 dde->td_node = NULL; 1103 tmpfs_free_dirent(tmp, dde); 1104 } 1105 } 1106 tmpfs_free_dirent(tmp, de); 1107 } 1108 } 1109 1110 /* 1111 * Helper function for tmpfs_readdir. Creates a '.' entry for the given 1112 * directory and returns it in the uio space. The function returns 0 1113 * on success, -1 if there was not enough space in the uio structure to 1114 * hold the directory entry or an appropriate error code if another 1115 * error happens. 1116 */ 1117 static int 1118 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio) 1119 { 1120 int error; 1121 struct dirent dent; 1122 1123 TMPFS_VALIDATE_DIR(node); 1124 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT); 1125 1126 dent.d_fileno = node->tn_id; 1127 dent.d_type = DT_DIR; 1128 dent.d_namlen = 1; 1129 dent.d_name[0] = '.'; 1130 dent.d_reclen = GENERIC_DIRSIZ(&dent); 1131 dirent_terminate(&dent); 1132 1133 if (dent.d_reclen > uio->uio_resid) 1134 error = EJUSTRETURN; 1135 else 1136 error = uiomove(&dent, dent.d_reclen, uio); 1137 1138 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1139 1140 return (error); 1141 } 1142 1143 /* 1144 * Helper function for tmpfs_readdir. Creates a '..' entry for the given 1145 * directory and returns it in the uio space. The function returns 0 1146 * on success, -1 if there was not enough space in the uio structure to 1147 * hold the directory entry or an appropriate error code if another 1148 * error happens. 1149 */ 1150 static int 1151 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio) 1152 { 1153 int error; 1154 struct dirent dent; 1155 1156 TMPFS_VALIDATE_DIR(node); 1157 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT); 1158 1159 /* 1160 * Return ENOENT if the current node is already removed. 1161 */ 1162 TMPFS_ASSERT_LOCKED(node); 1163 if (node->tn_dir.tn_parent == NULL) 1164 return (ENOENT); 1165 1166 TMPFS_NODE_LOCK(node->tn_dir.tn_parent); 1167 dent.d_fileno = node->tn_dir.tn_parent->tn_id; 1168 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent); 1169 1170 dent.d_type = DT_DIR; 1171 dent.d_namlen = 2; 1172 dent.d_name[0] = '.'; 1173 dent.d_name[1] = '.'; 1174 dent.d_reclen = GENERIC_DIRSIZ(&dent); 1175 dirent_terminate(&dent); 1176 1177 if (dent.d_reclen > uio->uio_resid) 1178 error = EJUSTRETURN; 1179 else 1180 error = uiomove(&dent, dent.d_reclen, uio); 1181 1182 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1183 1184 return (error); 1185 } 1186 1187 /* 1188 * Helper function for tmpfs_readdir. Returns as much directory entries 1189 * as can fit in the uio space. The read starts at uio->uio_offset. 1190 * The function returns 0 on success, -1 if there was not enough space 1191 * in the uio structure to hold the directory entry or an appropriate 1192 * error code if another error happens. 1193 */ 1194 int 1195 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, int maxcookies, 1196 u_long *cookies, int *ncookies) 1197 { 1198 struct tmpfs_dir_cursor dc; 1199 struct tmpfs_dirent *de; 1200 off_t off; 1201 int error; 1202 1203 TMPFS_VALIDATE_DIR(node); 1204 1205 off = 0; 1206 1207 /* 1208 * Lookup the node from the current offset. The starting offset of 1209 * 0 will lookup both '.' and '..', and then the first real entry, 1210 * or EOF if there are none. Then find all entries for the dir that 1211 * fit into the buffer. Once no more entries are found (de == NULL), 1212 * the offset is set to TMPFS_DIRCOOKIE_EOF, which will cause the next 1213 * call to return 0. 1214 */ 1215 switch (uio->uio_offset) { 1216 case TMPFS_DIRCOOKIE_DOT: 1217 error = tmpfs_dir_getdotdent(node, uio); 1218 if (error != 0) 1219 return (error); 1220 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT; 1221 if (cookies != NULL) 1222 cookies[(*ncookies)++] = off = uio->uio_offset; 1223 /* FALLTHROUGH */ 1224 case TMPFS_DIRCOOKIE_DOTDOT: 1225 error = tmpfs_dir_getdotdotdent(node, uio); 1226 if (error != 0) 1227 return (error); 1228 de = tmpfs_dir_first(node, &dc); 1229 uio->uio_offset = tmpfs_dirent_cookie(de); 1230 if (cookies != NULL) 1231 cookies[(*ncookies)++] = off = uio->uio_offset; 1232 /* EOF. */ 1233 if (de == NULL) 1234 return (0); 1235 break; 1236 case TMPFS_DIRCOOKIE_EOF: 1237 return (0); 1238 default: 1239 de = tmpfs_dir_lookup_cookie(node, uio->uio_offset, &dc); 1240 if (de == NULL) 1241 return (EINVAL); 1242 if (cookies != NULL) 1243 off = tmpfs_dirent_cookie(de); 1244 } 1245 1246 /* Read as much entries as possible; i.e., until we reach the end of 1247 * the directory or we exhaust uio space. */ 1248 do { 1249 struct dirent d; 1250 1251 /* Create a dirent structure representing the current 1252 * tmpfs_node and fill it. */ 1253 if (de->td_node == NULL) { 1254 d.d_fileno = 1; 1255 d.d_type = DT_WHT; 1256 } else { 1257 d.d_fileno = de->td_node->tn_id; 1258 switch (de->td_node->tn_type) { 1259 case VBLK: 1260 d.d_type = DT_BLK; 1261 break; 1262 1263 case VCHR: 1264 d.d_type = DT_CHR; 1265 break; 1266 1267 case VDIR: 1268 d.d_type = DT_DIR; 1269 break; 1270 1271 case VFIFO: 1272 d.d_type = DT_FIFO; 1273 break; 1274 1275 case VLNK: 1276 d.d_type = DT_LNK; 1277 break; 1278 1279 case VREG: 1280 d.d_type = DT_REG; 1281 break; 1282 1283 case VSOCK: 1284 d.d_type = DT_SOCK; 1285 break; 1286 1287 default: 1288 panic("tmpfs_dir_getdents: type %p %d", 1289 de->td_node, (int)de->td_node->tn_type); 1290 } 1291 } 1292 d.d_namlen = de->td_namelen; 1293 MPASS(de->td_namelen < sizeof(d.d_name)); 1294 (void)memcpy(d.d_name, de->ud.td_name, de->td_namelen); 1295 d.d_reclen = GENERIC_DIRSIZ(&d); 1296 dirent_terminate(&d); 1297 1298 /* Stop reading if the directory entry we are treating is 1299 * bigger than the amount of data that can be returned. */ 1300 if (d.d_reclen > uio->uio_resid) { 1301 error = EJUSTRETURN; 1302 break; 1303 } 1304 1305 /* Copy the new dirent structure into the output buffer and 1306 * advance pointers. */ 1307 error = uiomove(&d, d.d_reclen, uio); 1308 if (error == 0) { 1309 de = tmpfs_dir_next(node, &dc); 1310 if (cookies != NULL) { 1311 off = tmpfs_dirent_cookie(de); 1312 MPASS(*ncookies < maxcookies); 1313 cookies[(*ncookies)++] = off; 1314 } 1315 } 1316 } while (error == 0 && uio->uio_resid > 0 && de != NULL); 1317 1318 /* Skip setting off when using cookies as it is already done above. */ 1319 if (cookies == NULL) 1320 off = tmpfs_dirent_cookie(de); 1321 1322 /* Update the offset and cache. */ 1323 uio->uio_offset = off; 1324 node->tn_dir.tn_readdir_lastn = off; 1325 node->tn_dir.tn_readdir_lastp = de; 1326 1327 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1328 return error; 1329 } 1330 1331 int 1332 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp) 1333 { 1334 struct tmpfs_dirent *de; 1335 int error; 1336 1337 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL, 1338 cnp->cn_nameptr, cnp->cn_namelen, &de); 1339 if (error != 0) 1340 return (error); 1341 tmpfs_dir_attach(dvp, de); 1342 return (0); 1343 } 1344 1345 void 1346 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp) 1347 { 1348 struct tmpfs_dirent *de; 1349 1350 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1351 MPASS(de != NULL && de->td_node == NULL); 1352 tmpfs_dir_detach(dvp, de); 1353 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de); 1354 } 1355 1356 /* 1357 * Resizes the aobj associated with the regular file pointed to by 'vp' to the 1358 * size 'newsize'. 'vp' must point to a vnode that represents a regular file. 1359 * 'newsize' must be positive. 1360 * 1361 * Returns zero on success or an appropriate error code on failure. 1362 */ 1363 int 1364 tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr) 1365 { 1366 struct tmpfs_mount *tmp; 1367 struct tmpfs_node *node; 1368 vm_object_t uobj; 1369 vm_page_t m; 1370 vm_pindex_t idx, newpages, oldpages; 1371 off_t oldsize; 1372 int base, rv; 1373 1374 MPASS(vp->v_type == VREG); 1375 MPASS(newsize >= 0); 1376 1377 node = VP_TO_TMPFS_NODE(vp); 1378 uobj = node->tn_reg.tn_aobj; 1379 tmp = VFS_TO_TMPFS(vp->v_mount); 1380 1381 /* 1382 * Convert the old and new sizes to the number of pages needed to 1383 * store them. It may happen that we do not need to do anything 1384 * because the last allocated page can accommodate the change on 1385 * its own. 1386 */ 1387 oldsize = node->tn_size; 1388 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK); 1389 MPASS(oldpages == uobj->size); 1390 newpages = OFF_TO_IDX(newsize + PAGE_MASK); 1391 1392 if (__predict_true(newpages == oldpages && newsize >= oldsize)) { 1393 node->tn_size = newsize; 1394 return (0); 1395 } 1396 1397 if (newpages > oldpages && 1398 tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0) 1399 return (ENOSPC); 1400 1401 VM_OBJECT_WLOCK(uobj); 1402 if (newsize < oldsize) { 1403 /* 1404 * Zero the truncated part of the last page. 1405 */ 1406 base = newsize & PAGE_MASK; 1407 if (base != 0) { 1408 idx = OFF_TO_IDX(newsize); 1409 retry: 1410 m = vm_page_lookup(uobj, idx); 1411 if (m != NULL) { 1412 if (vm_page_sleep_if_busy(m, "tmfssz")) 1413 goto retry; 1414 MPASS(m->valid == VM_PAGE_BITS_ALL); 1415 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) { 1416 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL | 1417 VM_ALLOC_WAITFAIL); 1418 if (m == NULL) 1419 goto retry; 1420 rv = vm_pager_get_pages(uobj, &m, 1, NULL, 1421 NULL); 1422 vm_page_lock(m); 1423 if (rv == VM_PAGER_OK) { 1424 /* 1425 * Since the page was not resident, 1426 * and therefore not recently 1427 * accessed, immediately enqueue it 1428 * for asynchronous laundering. The 1429 * current operation is not regarded 1430 * as an access. 1431 */ 1432 vm_page_launder(m); 1433 vm_page_unlock(m); 1434 vm_page_xunbusy(m); 1435 } else { 1436 vm_page_free(m); 1437 vm_page_unlock(m); 1438 if (ignerr) 1439 m = NULL; 1440 else { 1441 VM_OBJECT_WUNLOCK(uobj); 1442 return (EIO); 1443 } 1444 } 1445 } 1446 if (m != NULL) { 1447 pmap_zero_page_area(m, base, PAGE_SIZE - base); 1448 vm_page_dirty(m); 1449 vm_pager_page_unswapped(m); 1450 } 1451 } 1452 1453 /* 1454 * Release any swap space and free any whole pages. 1455 */ 1456 if (newpages < oldpages) { 1457 swap_pager_freespace(uobj, newpages, oldpages - 1458 newpages); 1459 vm_object_page_remove(uobj, newpages, 0, 0); 1460 } 1461 } 1462 uobj->size = newpages; 1463 VM_OBJECT_WUNLOCK(uobj); 1464 1465 atomic_add_long(&tmp->tm_pages_used, newpages - oldpages); 1466 1467 node->tn_size = newsize; 1468 return (0); 1469 } 1470 1471 void 1472 tmpfs_check_mtime(struct vnode *vp) 1473 { 1474 struct tmpfs_node *node; 1475 struct vm_object *obj; 1476 1477 ASSERT_VOP_ELOCKED(vp, "check_mtime"); 1478 if (vp->v_type != VREG) 1479 return; 1480 obj = vp->v_object; 1481 KASSERT((obj->flags & (OBJ_TMPFS_NODE | OBJ_TMPFS)) == 1482 (OBJ_TMPFS_NODE | OBJ_TMPFS), ("non-tmpfs obj")); 1483 /* unlocked read */ 1484 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) { 1485 VM_OBJECT_WLOCK(obj); 1486 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) { 1487 obj->flags &= ~OBJ_TMPFS_DIRTY; 1488 node = VP_TO_TMPFS_NODE(vp); 1489 node->tn_status |= TMPFS_NODE_MODIFIED | 1490 TMPFS_NODE_CHANGED; 1491 } 1492 VM_OBJECT_WUNLOCK(obj); 1493 } 1494 } 1495 1496 /* 1497 * Change flags of the given vnode. 1498 * Caller should execute tmpfs_update on vp after a successful execution. 1499 * The vnode must be locked on entry and remain locked on exit. 1500 */ 1501 int 1502 tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred, 1503 struct thread *p) 1504 { 1505 int error; 1506 struct tmpfs_node *node; 1507 1508 ASSERT_VOP_ELOCKED(vp, "chflags"); 1509 1510 node = VP_TO_TMPFS_NODE(vp); 1511 1512 if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK | 1513 UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP | 1514 UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE | 1515 UF_SPARSE | UF_SYSTEM)) != 0) 1516 return (EOPNOTSUPP); 1517 1518 /* Disallow this operation if the file system is mounted read-only. */ 1519 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1520 return EROFS; 1521 1522 /* 1523 * Callers may only modify the file flags on objects they 1524 * have VADMIN rights for. 1525 */ 1526 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1527 return (error); 1528 /* 1529 * Unprivileged processes are not permitted to unset system 1530 * flags, or modify flags if any system flags are set. 1531 */ 1532 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 1533 if (node->tn_flags & 1534 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 1535 error = securelevel_gt(cred, 0); 1536 if (error) 1537 return (error); 1538 } 1539 } else { 1540 if (node->tn_flags & 1541 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 1542 ((flags ^ node->tn_flags) & SF_SETTABLE)) 1543 return (EPERM); 1544 } 1545 node->tn_flags = flags; 1546 node->tn_status |= TMPFS_NODE_CHANGED; 1547 1548 ASSERT_VOP_ELOCKED(vp, "chflags2"); 1549 1550 return (0); 1551 } 1552 1553 /* 1554 * Change access mode on the given vnode. 1555 * Caller should execute tmpfs_update on vp after a successful execution. 1556 * The vnode must be locked on entry and remain locked on exit. 1557 */ 1558 int 1559 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p) 1560 { 1561 int error; 1562 struct tmpfs_node *node; 1563 1564 ASSERT_VOP_ELOCKED(vp, "chmod"); 1565 1566 node = VP_TO_TMPFS_NODE(vp); 1567 1568 /* Disallow this operation if the file system is mounted read-only. */ 1569 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1570 return EROFS; 1571 1572 /* Immutable or append-only files cannot be modified, either. */ 1573 if (node->tn_flags & (IMMUTABLE | APPEND)) 1574 return EPERM; 1575 1576 /* 1577 * To modify the permissions on a file, must possess VADMIN 1578 * for that file. 1579 */ 1580 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1581 return (error); 1582 1583 /* 1584 * Privileged processes may set the sticky bit on non-directories, 1585 * as well as set the setgid bit on a file with a group that the 1586 * process is not a member of. 1587 */ 1588 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 1589 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 1590 return (EFTYPE); 1591 } 1592 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) { 1593 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 1594 if (error) 1595 return (error); 1596 } 1597 1598 1599 node->tn_mode &= ~ALLPERMS; 1600 node->tn_mode |= mode & ALLPERMS; 1601 1602 node->tn_status |= TMPFS_NODE_CHANGED; 1603 1604 ASSERT_VOP_ELOCKED(vp, "chmod2"); 1605 1606 return (0); 1607 } 1608 1609 /* 1610 * Change ownership of the given vnode. At least one of uid or gid must 1611 * be different than VNOVAL. If one is set to that value, the attribute 1612 * is unchanged. 1613 * Caller should execute tmpfs_update on vp after a successful execution. 1614 * The vnode must be locked on entry and remain locked on exit. 1615 */ 1616 int 1617 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 1618 struct thread *p) 1619 { 1620 int error; 1621 struct tmpfs_node *node; 1622 uid_t ouid; 1623 gid_t ogid; 1624 1625 ASSERT_VOP_ELOCKED(vp, "chown"); 1626 1627 node = VP_TO_TMPFS_NODE(vp); 1628 1629 /* Assign default values if they are unknown. */ 1630 MPASS(uid != VNOVAL || gid != VNOVAL); 1631 if (uid == VNOVAL) 1632 uid = node->tn_uid; 1633 if (gid == VNOVAL) 1634 gid = node->tn_gid; 1635 MPASS(uid != VNOVAL && gid != VNOVAL); 1636 1637 /* Disallow this operation if the file system is mounted read-only. */ 1638 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1639 return EROFS; 1640 1641 /* Immutable or append-only files cannot be modified, either. */ 1642 if (node->tn_flags & (IMMUTABLE | APPEND)) 1643 return EPERM; 1644 1645 /* 1646 * To modify the ownership of a file, must possess VADMIN for that 1647 * file. 1648 */ 1649 if ((error = VOP_ACCESS(vp, VADMIN, cred, p))) 1650 return (error); 1651 1652 /* 1653 * To change the owner of a file, or change the group of a file to a 1654 * group of which we are not a member, the caller must have 1655 * privilege. 1656 */ 1657 if ((uid != node->tn_uid || 1658 (gid != node->tn_gid && !groupmember(gid, cred))) && 1659 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 1660 return (error); 1661 1662 ogid = node->tn_gid; 1663 ouid = node->tn_uid; 1664 1665 node->tn_uid = uid; 1666 node->tn_gid = gid; 1667 1668 node->tn_status |= TMPFS_NODE_CHANGED; 1669 1670 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) { 1671 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) 1672 node->tn_mode &= ~(S_ISUID | S_ISGID); 1673 } 1674 1675 ASSERT_VOP_ELOCKED(vp, "chown2"); 1676 1677 return (0); 1678 } 1679 1680 /* 1681 * Change size of the given vnode. 1682 * Caller should execute tmpfs_update on vp after a successful execution. 1683 * The vnode must be locked on entry and remain locked on exit. 1684 */ 1685 int 1686 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred, 1687 struct thread *p) 1688 { 1689 int error; 1690 struct tmpfs_node *node; 1691 1692 ASSERT_VOP_ELOCKED(vp, "chsize"); 1693 1694 node = VP_TO_TMPFS_NODE(vp); 1695 1696 /* Decide whether this is a valid operation based on the file type. */ 1697 error = 0; 1698 switch (vp->v_type) { 1699 case VDIR: 1700 return EISDIR; 1701 1702 case VREG: 1703 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1704 return EROFS; 1705 break; 1706 1707 case VBLK: 1708 /* FALLTHROUGH */ 1709 case VCHR: 1710 /* FALLTHROUGH */ 1711 case VFIFO: 1712 /* Allow modifications of special files even if in the file 1713 * system is mounted read-only (we are not modifying the 1714 * files themselves, but the objects they represent). */ 1715 return 0; 1716 1717 default: 1718 /* Anything else is unsupported. */ 1719 return EOPNOTSUPP; 1720 } 1721 1722 /* Immutable or append-only files cannot be modified, either. */ 1723 if (node->tn_flags & (IMMUTABLE | APPEND)) 1724 return EPERM; 1725 1726 error = tmpfs_truncate(vp, size); 1727 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents 1728 * for us, as will update tn_status; no need to do that here. */ 1729 1730 ASSERT_VOP_ELOCKED(vp, "chsize2"); 1731 1732 return (error); 1733 } 1734 1735 /* 1736 * Change access and modification times of the given vnode. 1737 * Caller should execute tmpfs_update on vp after a successful execution. 1738 * The vnode must be locked on entry and remain locked on exit. 1739 */ 1740 int 1741 tmpfs_chtimes(struct vnode *vp, struct vattr *vap, 1742 struct ucred *cred, struct thread *l) 1743 { 1744 int error; 1745 struct tmpfs_node *node; 1746 1747 ASSERT_VOP_ELOCKED(vp, "chtimes"); 1748 1749 node = VP_TO_TMPFS_NODE(vp); 1750 1751 /* Disallow this operation if the file system is mounted read-only. */ 1752 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1753 return EROFS; 1754 1755 /* Immutable or append-only files cannot be modified, either. */ 1756 if (node->tn_flags & (IMMUTABLE | APPEND)) 1757 return EPERM; 1758 1759 error = vn_utimes_perm(vp, vap, cred, l); 1760 if (error != 0) 1761 return (error); 1762 1763 if (vap->va_atime.tv_sec != VNOVAL) 1764 node->tn_status |= TMPFS_NODE_ACCESSED; 1765 1766 if (vap->va_mtime.tv_sec != VNOVAL) 1767 node->tn_status |= TMPFS_NODE_MODIFIED; 1768 1769 if (vap->va_birthtime.tv_sec != VNOVAL) 1770 node->tn_status |= TMPFS_NODE_MODIFIED; 1771 1772 tmpfs_itimes(vp, &vap->va_atime, &vap->va_mtime); 1773 1774 if (vap->va_birthtime.tv_sec != VNOVAL) 1775 node->tn_birthtime = vap->va_birthtime; 1776 ASSERT_VOP_ELOCKED(vp, "chtimes2"); 1777 1778 return (0); 1779 } 1780 1781 void 1782 tmpfs_set_status(struct tmpfs_node *node, int status) 1783 { 1784 1785 if ((node->tn_status & status) == status) 1786 return; 1787 TMPFS_NODE_LOCK(node); 1788 node->tn_status |= status; 1789 TMPFS_NODE_UNLOCK(node); 1790 } 1791 1792 /* Sync timestamps */ 1793 void 1794 tmpfs_itimes(struct vnode *vp, const struct timespec *acc, 1795 const struct timespec *mod) 1796 { 1797 struct tmpfs_node *node; 1798 struct timespec now; 1799 1800 ASSERT_VOP_LOCKED(vp, "tmpfs_itimes"); 1801 node = VP_TO_TMPFS_NODE(vp); 1802 1803 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1804 TMPFS_NODE_CHANGED)) == 0) 1805 return; 1806 1807 vfs_timestamp(&now); 1808 TMPFS_NODE_LOCK(node); 1809 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1810 if (acc == NULL) 1811 acc = &now; 1812 node->tn_atime = *acc; 1813 } 1814 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1815 if (mod == NULL) 1816 mod = &now; 1817 node->tn_mtime = *mod; 1818 } 1819 if (node->tn_status & TMPFS_NODE_CHANGED) 1820 node->tn_ctime = now; 1821 node->tn_status &= ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1822 TMPFS_NODE_CHANGED); 1823 TMPFS_NODE_UNLOCK(node); 1824 1825 /* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */ 1826 random_harvest_queue(node, sizeof(*node), RANDOM_FS_ATIME); 1827 } 1828 1829 void 1830 tmpfs_update(struct vnode *vp) 1831 { 1832 1833 tmpfs_itimes(vp, NULL, NULL); 1834 } 1835 1836 int 1837 tmpfs_truncate(struct vnode *vp, off_t length) 1838 { 1839 int error; 1840 struct tmpfs_node *node; 1841 1842 node = VP_TO_TMPFS_NODE(vp); 1843 1844 if (length < 0) { 1845 error = EINVAL; 1846 goto out; 1847 } 1848 1849 if (node->tn_size == length) { 1850 error = 0; 1851 goto out; 1852 } 1853 1854 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 1855 return (EFBIG); 1856 1857 error = tmpfs_reg_resize(vp, length, FALSE); 1858 if (error == 0) 1859 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1860 1861 out: 1862 tmpfs_update(vp); 1863 1864 return (error); 1865 } 1866 1867 static __inline int 1868 tmpfs_dirtree_cmp(struct tmpfs_dirent *a, struct tmpfs_dirent *b) 1869 { 1870 if (a->td_hash > b->td_hash) 1871 return (1); 1872 else if (a->td_hash < b->td_hash) 1873 return (-1); 1874 return (0); 1875 } 1876 1877 RB_GENERATE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);
Cache object: 710bdcc04998b8324ecc0ebee1cc8c29
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