1 /* $NetBSD: tmpfs_subr.c,v 1.35 2007/07/09 21:10:50 ad Exp $ */
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
6 * Copyright (c) 2005 The NetBSD Foundation, Inc.
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
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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.
36 * Efficient memory file system supporting functions.
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/dirent.h>
44 #include <sys/fnv_hash.h>
46 #include <sys/limits.h>
47 #include <sys/mount.h>
48 #include <sys/namei.h>
51 #include <sys/random.h>
52 #include <sys/rwlock.h>
54 #include <sys/sysctl.h>
55 #include <sys/vnode.h>
56 #include <sys/vmmeter.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>
67 #include <fs/tmpfs/tmpfs.h>
68 #include <fs/tmpfs/tmpfs_fifoops.h>
69 #include <fs/tmpfs/tmpfs_vnops.h>
71 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system");
73 static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;
76 sysctl_mem_reserved(SYSCTL_HANDLER_ARGS)
81 pages = *(long *)arg1;
82 bytes = pages * PAGE_SIZE;
84 error = sysctl_handle_long(oidp, &bytes, 0, req);
85 if (error || !req->newptr)
88 pages = bytes / PAGE_SIZE;
89 if (pages < TMPFS_PAGES_MINRESERVED)
92 *(long *)arg1 = pages;
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");
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);
105 tmpfs_mem_avail(void)
109 avail = swap_pager_avail + vm_free_count() - tmpfs_pages_reserved;
110 if (__predict_false(avail < 0))
116 tmpfs_pages_used(struct tmpfs_mount *tmp)
118 const size_t node_size = sizeof(struct tmpfs_node) +
119 sizeof(struct tmpfs_dirent);
122 meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size,
124 return (meta_pages + tmp->tm_pages_used);
128 tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages)
130 if (tmpfs_mem_avail() < req_pages)
133 if (tmp->tm_pages_max != ULONG_MAX &&
134 tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp))
141 tmpfs_ref_node(struct tmpfs_node *node)
144 TMPFS_NODE_LOCK(node);
145 tmpfs_ref_node_locked(node);
146 TMPFS_NODE_UNLOCK(node);
150 tmpfs_ref_node_locked(struct tmpfs_node *node)
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,
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'.
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.
169 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter
170 * specifies the device the node represents.
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
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.
180 * Returns zero on success or an appropriate error code on failure.
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 const char *target, dev_t rdev, struct tmpfs_node **node)
187 struct tmpfs_node *nnode;
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"));
196 MPASS(IFF(type == VLNK, target != NULL));
197 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL));
199 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max)
201 if (tmpfs_pages_check_avail(tmp, 1) == 0)
204 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
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.
216 * Tmpfs does not need to instantiate new nodes during
222 nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp,
225 /* Generic initialization. */
226 nnode->tn_type = type;
227 vfs_timestamp(&nnode->tn_atime);
228 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime =
232 nnode->tn_mode = mode;
233 nnode->tn_id = alloc_unr64(&tmp->tm_ino_unr);
234 nnode->tn_refcount = 1;
236 /* Type-specific initialization. */
237 switch (nnode->tn_type) {
240 nnode->tn_rdev = rdev;
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;
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);
263 MPASS(strlen(target) < MAXPATHLEN);
264 nnode->tn_size = strlen(target);
265 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME,
267 memcpy(nnode->tn_link, target, nnode->tn_size);
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);
282 panic("tmpfs_alloc_node: type %p %d", nnode,
283 (int)nnode->tn_type);
287 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries);
288 nnode->tn_attached = true;
289 tmp->tm_nodes_inuse++;
298 * Destroys the node pointed to by node from the file system 'tmp'.
299 * If the node references a directory, no entries are allowed.
302 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
306 TMPFS_NODE_LOCK(node);
307 if (!tmpfs_free_node_locked(tmp, node, false)) {
308 TMPFS_NODE_UNLOCK(node);
314 tmpfs_free_node_locked(struct tmpfs_mount *tmp, struct tmpfs_node *node,
319 TMPFS_MP_ASSERT_LOCKED(tmp);
320 TMPFS_NODE_ASSERT_LOCKED(node);
321 KASSERT(node->tn_refcount > 0, ("node %p refcount zero", node));
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;
330 if (node->tn_refcount > 0)
334 MPASS(node->tn_vnode == NULL);
335 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0);
337 TMPFS_NODE_UNLOCK(node);
340 switch (node->tn_type) {
353 free(node->tn_link, M_TMPFSNAME);
357 uobj = node->tn_reg.tn_aobj;
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);
368 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);
371 uma_zfree(tmp->tm_node_pool, node);
377 static __inline uint32_t
378 tmpfs_dirent_hash(const char *name, u_int len)
382 hash = fnv_32_buf(name, len, FNV1_32_INIT + len) & TMPFS_DIRCOOKIE_MASK;
383 #ifdef TMPFS_DEBUG_DIRCOOKIE_DUP
386 if (hash < TMPFS_DIRCOOKIE_MIN)
387 hash += TMPFS_DIRCOOKIE_MIN;
392 static __inline off_t
393 tmpfs_dirent_cookie(struct tmpfs_dirent *de)
396 return (TMPFS_DIRCOOKIE_EOF);
398 MPASS(de->td_cookie >= TMPFS_DIRCOOKIE_MIN);
400 return (de->td_cookie);
403 static __inline boolean_t
404 tmpfs_dirent_dup(struct tmpfs_dirent *de)
406 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUP) != 0);
409 static __inline boolean_t
410 tmpfs_dirent_duphead(struct tmpfs_dirent *de)
412 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUPHEAD) != 0);
416 tmpfs_dirent_init(struct tmpfs_dirent *de, const char *name, u_int namelen)
418 de->td_hash = de->td_cookie = tmpfs_dirent_hash(name, namelen);
419 memcpy(de->ud.td_name, name, namelen);
420 de->td_namelen = namelen;
424 * Allocates a new directory entry for the node node with a name of name.
425 * The new directory entry is returned in *de.
427 * The link count of node is increased by one to reflect the new object
430 * Returns zero on success or an appropriate error code on failure.
433 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node,
434 const char *name, u_int len, struct tmpfs_dirent **de)
436 struct tmpfs_dirent *nde;
438 nde = uma_zalloc(tmp->tm_dirent_pool, M_WAITOK);
441 nde->ud.td_name = malloc(len, M_TMPFSNAME, M_WAITOK);
442 tmpfs_dirent_init(nde, name, len);
454 * Frees a directory entry. It is the caller's responsibility to destroy
455 * the node referenced by it if needed.
457 * The link count of node is decreased by one to reflect the removal of an
458 * object that referenced it. This only happens if 'node_exists' is true;
459 * otherwise the function will not access the node referred to by the
460 * directory entry, as it may already have been released from the outside.
463 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de)
465 struct tmpfs_node *node;
469 MPASS(node->tn_links > 0);
472 if (!tmpfs_dirent_duphead(de) && de->ud.td_name != NULL)
473 free(de->ud.td_name, M_TMPFSNAME);
474 uma_zfree(tmp->tm_dirent_pool, de);
478 tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj)
481 ASSERT_VOP_ELOCKED(vp, "tmpfs_destroy_vobject");
482 if (vp->v_type != VREG || obj == NULL)
485 VM_OBJECT_WLOCK(obj);
487 vm_object_clear_flag(obj, OBJ_TMPFS);
488 obj->un_pager.swp.swp_tmpfs = NULL;
490 VM_OBJECT_WUNLOCK(obj);
494 * Need to clear v_object for insmntque failure.
497 tmpfs_insmntque_dtr(struct vnode *vp, void *dtr_arg)
500 tmpfs_destroy_vobject(vp, vp->v_object);
503 vp->v_op = &dead_vnodeops;
509 * Allocates a new vnode for the node node or returns a new reference to
510 * an existing one if the node had already a vnode referencing it. The
511 * resulting locked vnode is returned in *vpp.
513 * Returns zero on success or an appropriate error code on failure.
516 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag,
520 struct tmpfs_mount *tm;
525 tm = VFS_TO_TMPFS(mp);
526 TMPFS_NODE_LOCK(node);
527 tmpfs_ref_node_locked(node);
529 TMPFS_NODE_ASSERT_LOCKED(node);
530 if ((vp = node->tn_vnode) != NULL) {
531 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0);
533 if ((node->tn_type == VDIR && node->tn_dir.tn_parent == NULL) ||
534 ((vp->v_iflag & VI_DOOMED) != 0 &&
535 (lkflag & LK_NOWAIT) != 0)) {
537 TMPFS_NODE_UNLOCK(node);
542 if ((vp->v_iflag & VI_DOOMED) != 0) {
544 node->tn_vpstate |= TMPFS_VNODE_WRECLAIM;
545 while ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) {
546 msleep(&node->tn_vnode, TMPFS_NODE_MTX(node),
551 TMPFS_NODE_UNLOCK(node);
552 error = vget(vp, lkflag | LK_INTERLOCK, curthread);
553 if (error == ENOENT) {
554 TMPFS_NODE_LOCK(node);
563 * Make sure the vnode is still there after
564 * getting the interlock to avoid racing a free.
566 if (node->tn_vnode == NULL || node->tn_vnode != vp) {
568 TMPFS_NODE_LOCK(node);
575 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) ||
576 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) {
577 TMPFS_NODE_UNLOCK(node);
584 * otherwise lock the vp list while we call getnewvnode
585 * since that can block.
587 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) {
588 node->tn_vpstate |= TMPFS_VNODE_WANT;
589 error = msleep((caddr_t) &node->tn_vpstate,
590 TMPFS_NODE_MTX(node), 0, "tmpfs_alloc_vp", 0);
595 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING;
597 TMPFS_NODE_UNLOCK(node);
599 /* Get a new vnode and associate it with our node. */
600 error = getnewvnode("tmpfs", mp, VFS_TO_TMPFS(mp)->tm_nonc ?
601 &tmpfs_vnodeop_nonc_entries : &tmpfs_vnodeop_entries, &vp);
606 /* lkflag is ignored, the lock is exclusive */
607 (void) vn_lock(vp, lkflag | LK_RETRY);
610 vp->v_type = node->tn_type;
612 /* Type-specific initialization. */
613 switch (node->tn_type) {
623 vp->v_op = &tmpfs_fifoop_entries;
626 object = node->tn_reg.tn_aobj;
627 VM_OBJECT_WLOCK(object);
629 KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs"));
630 vp->v_object = object;
631 object->un_pager.swp.swp_tmpfs = vp;
632 vm_object_set_flag(object, OBJ_TMPFS);
634 VM_OBJECT_WUNLOCK(object);
637 MPASS(node->tn_dir.tn_parent != NULL);
638 if (node->tn_dir.tn_parent == node)
639 vp->v_vflag |= VV_ROOT;
643 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type);
645 if (vp->v_type != VFIFO)
648 error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL);
653 TMPFS_NODE_LOCK(node);
655 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING);
656 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING;
659 if (node->tn_vpstate & TMPFS_VNODE_WANT) {
660 node->tn_vpstate &= ~TMPFS_VNODE_WANT;
661 TMPFS_NODE_UNLOCK(node);
662 wakeup((caddr_t) &node->tn_vpstate);
664 TMPFS_NODE_UNLOCK(node);
671 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp));
672 TMPFS_NODE_LOCK(node);
673 MPASS(*vpp == node->tn_vnode);
674 TMPFS_NODE_UNLOCK(node);
677 tmpfs_free_node(tm, node);
683 * Destroys the association between the vnode vp and the node it
687 tmpfs_free_vp(struct vnode *vp)
689 struct tmpfs_node *node;
691 node = VP_TO_TMPFS_NODE(vp);
693 TMPFS_NODE_ASSERT_LOCKED(node);
694 node->tn_vnode = NULL;
695 if ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0)
696 wakeup(&node->tn_vnode);
697 node->tn_vpstate &= ~TMPFS_VNODE_WRECLAIM;
702 * Allocates a new file of type 'type' and adds it to the parent directory
703 * 'dvp'; this addition is done using the component name given in 'cnp'.
704 * The ownership of the new file is automatically assigned based on the
705 * credentials of the caller (through 'cnp'), the group is set based on
706 * the parent directory and the mode is determined from the 'vap' argument.
707 * If successful, *vpp holds a vnode to the newly created file and zero
708 * is returned. Otherwise *vpp is NULL and the function returns an
709 * appropriate error code.
712 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap,
713 struct componentname *cnp, const char *target)
716 struct tmpfs_dirent *de;
717 struct tmpfs_mount *tmp;
718 struct tmpfs_node *dnode;
719 struct tmpfs_node *node;
720 struct tmpfs_node *parent;
722 ASSERT_VOP_ELOCKED(dvp, "tmpfs_alloc_file");
723 MPASS(cnp->cn_flags & HASBUF);
725 tmp = VFS_TO_TMPFS(dvp->v_mount);
726 dnode = VP_TO_TMPFS_DIR(dvp);
729 /* If the entry we are creating is a directory, we cannot overflow
730 * the number of links of its parent, because it will get a new
732 if (vap->va_type == VDIR) {
733 /* Ensure that we do not overflow the maximum number of links
734 * imposed by the system. */
735 MPASS(dnode->tn_links <= TMPFS_LINK_MAX);
736 if (dnode->tn_links == TMPFS_LINK_MAX) {
741 MPASS(parent != NULL);
745 /* Allocate a node that represents the new file. */
746 error = tmpfs_alloc_node(dvp->v_mount, tmp, vap->va_type,
747 cnp->cn_cred->cr_uid, dnode->tn_gid, vap->va_mode, parent,
748 target, vap->va_rdev, &node);
752 /* Allocate a directory entry that points to the new file. */
753 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen,
756 tmpfs_free_node(tmp, node);
760 /* Allocate a vnode for the new file. */
761 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp);
763 tmpfs_free_dirent(tmp, de);
764 tmpfs_free_node(tmp, node);
768 /* Now that all required items are allocated, we can proceed to
769 * insert the new node into the directory, an operation that
771 if (cnp->cn_flags & ISWHITEOUT)
772 tmpfs_dir_whiteout_remove(dvp, cnp);
773 tmpfs_dir_attach(dvp, de);
777 struct tmpfs_dirent *
778 tmpfs_dir_first(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
780 struct tmpfs_dirent *de;
782 de = RB_MIN(tmpfs_dir, &dnode->tn_dir.tn_dirhead);
784 if (de != NULL && tmpfs_dirent_duphead(de))
785 de = LIST_FIRST(&de->ud.td_duphead);
786 dc->tdc_current = de;
788 return (dc->tdc_current);
791 struct tmpfs_dirent *
792 tmpfs_dir_next(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
794 struct tmpfs_dirent *de;
796 MPASS(dc->tdc_tree != NULL);
797 if (tmpfs_dirent_dup(dc->tdc_current)) {
798 dc->tdc_current = LIST_NEXT(dc->tdc_current, uh.td_dup.entries);
799 if (dc->tdc_current != NULL)
800 return (dc->tdc_current);
802 dc->tdc_tree = dc->tdc_current = RB_NEXT(tmpfs_dir,
803 &dnode->tn_dir.tn_dirhead, dc->tdc_tree);
804 if ((de = dc->tdc_current) != NULL && tmpfs_dirent_duphead(de)) {
805 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
806 MPASS(dc->tdc_current != NULL);
809 return (dc->tdc_current);
812 /* Lookup directory entry in RB-Tree. Function may return duphead entry. */
813 static struct tmpfs_dirent *
814 tmpfs_dir_xlookup_hash(struct tmpfs_node *dnode, uint32_t hash)
816 struct tmpfs_dirent *de, dekey;
818 dekey.td_hash = hash;
819 de = RB_FIND(tmpfs_dir, &dnode->tn_dir.tn_dirhead, &dekey);
823 /* Lookup directory entry by cookie, initialize directory cursor accordingly. */
824 static struct tmpfs_dirent *
825 tmpfs_dir_lookup_cookie(struct tmpfs_node *node, off_t cookie,
826 struct tmpfs_dir_cursor *dc)
828 struct tmpfs_dir *dirhead = &node->tn_dir.tn_dirhead;
829 struct tmpfs_dirent *de, dekey;
831 MPASS(cookie >= TMPFS_DIRCOOKIE_MIN);
833 if (cookie == node->tn_dir.tn_readdir_lastn &&
834 (de = node->tn_dir.tn_readdir_lastp) != NULL) {
835 /* Protect against possible race, tn_readdir_last[pn]
836 * may be updated with only shared vnode lock held. */
837 if (cookie == tmpfs_dirent_cookie(de))
841 if ((cookie & TMPFS_DIRCOOKIE_DUP) != 0) {
842 LIST_FOREACH(de, &node->tn_dir.tn_dupindex,
843 uh.td_dup.index_entries) {
844 MPASS(tmpfs_dirent_dup(de));
845 if (de->td_cookie == cookie)
847 /* dupindex list is sorted. */
848 if (de->td_cookie < cookie) {
857 if ((cookie & TMPFS_DIRCOOKIE_MASK) != cookie) {
860 dekey.td_hash = cookie;
861 /* Recover if direntry for cookie was removed */
862 de = RB_NFIND(tmpfs_dir, dirhead, &dekey);
865 dc->tdc_current = de;
866 if (de != NULL && tmpfs_dirent_duphead(de)) {
867 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
868 MPASS(dc->tdc_current != NULL);
870 return (dc->tdc_current);
874 dc->tdc_current = de;
875 if (de != NULL && tmpfs_dirent_dup(de))
876 dc->tdc_tree = tmpfs_dir_xlookup_hash(node,
878 return (dc->tdc_current);
882 * Looks for a directory entry in the directory represented by node.
883 * 'cnp' describes the name of the entry to look for. Note that the .
884 * and .. components are not allowed as they do not physically exist
885 * within directories.
887 * Returns a pointer to the entry when found, otherwise NULL.
889 struct tmpfs_dirent *
890 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f,
891 struct componentname *cnp)
893 struct tmpfs_dir_duphead *duphead;
894 struct tmpfs_dirent *de;
897 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.'));
898 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' &&
899 cnp->cn_nameptr[1] == '.')));
900 TMPFS_VALIDATE_DIR(node);
902 hash = tmpfs_dirent_hash(cnp->cn_nameptr, cnp->cn_namelen);
903 de = tmpfs_dir_xlookup_hash(node, hash);
904 if (de != NULL && tmpfs_dirent_duphead(de)) {
905 duphead = &de->ud.td_duphead;
906 LIST_FOREACH(de, duphead, uh.td_dup.entries) {
907 if (TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
911 } else if (de != NULL) {
912 if (!TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
916 if (de != NULL && f != NULL && de->td_node != f)
923 * Attach duplicate-cookie directory entry nde to dnode and insert to dupindex
924 * list, allocate new cookie value.
927 tmpfs_dir_attach_dup(struct tmpfs_node *dnode,
928 struct tmpfs_dir_duphead *duphead, struct tmpfs_dirent *nde)
930 struct tmpfs_dir_duphead *dupindex;
931 struct tmpfs_dirent *de, *pde;
933 dupindex = &dnode->tn_dir.tn_dupindex;
934 de = LIST_FIRST(dupindex);
935 if (de == NULL || de->td_cookie < TMPFS_DIRCOOKIE_DUP_MAX) {
937 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
939 nde->td_cookie = de->td_cookie + 1;
940 MPASS(tmpfs_dirent_dup(nde));
941 LIST_INSERT_HEAD(dupindex, nde, uh.td_dup.index_entries);
942 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
947 * Cookie numbers are near exhaustion. Scan dupindex list for unused
948 * numbers. dupindex list is sorted in descending order. Keep it so
949 * after inserting nde.
953 de = LIST_NEXT(de, uh.td_dup.index_entries);
954 if (de == NULL && pde->td_cookie != TMPFS_DIRCOOKIE_DUP_MIN) {
956 * Last element of the index doesn't have minimal cookie
959 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
960 LIST_INSERT_AFTER(pde, nde, uh.td_dup.index_entries);
961 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
963 } else if (de == NULL) {
965 * We are so lucky have 2^30 hash duplicates in single
966 * directory :) Return largest possible cookie value.
967 * It should be fine except possible issues with
968 * VOP_READDIR restart.
970 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MAX;
971 LIST_INSERT_HEAD(dupindex, nde,
972 uh.td_dup.index_entries);
973 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
976 if (de->td_cookie + 1 == pde->td_cookie ||
977 de->td_cookie >= TMPFS_DIRCOOKIE_DUP_MAX)
978 continue; /* No hole or invalid cookie. */
979 nde->td_cookie = de->td_cookie + 1;
980 MPASS(tmpfs_dirent_dup(nde));
981 MPASS(pde->td_cookie > nde->td_cookie);
982 MPASS(nde->td_cookie > de->td_cookie);
983 LIST_INSERT_BEFORE(de, nde, uh.td_dup.index_entries);
984 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
990 * Attaches the directory entry de to the directory represented by vp.
991 * Note that this does not change the link count of the node pointed by
992 * the directory entry, as this is done by tmpfs_alloc_dirent.
995 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de)
997 struct tmpfs_node *dnode;
998 struct tmpfs_dirent *xde, *nde;
1000 ASSERT_VOP_ELOCKED(vp, __func__);
1001 MPASS(de->td_namelen > 0);
1002 MPASS(de->td_hash >= TMPFS_DIRCOOKIE_MIN);
1003 MPASS(de->td_cookie == de->td_hash);
1005 dnode = VP_TO_TMPFS_DIR(vp);
1006 dnode->tn_dir.tn_readdir_lastn = 0;
1007 dnode->tn_dir.tn_readdir_lastp = NULL;
1009 MPASS(!tmpfs_dirent_dup(de));
1010 xde = RB_INSERT(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
1011 if (xde != NULL && tmpfs_dirent_duphead(xde))
1012 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
1013 else if (xde != NULL) {
1015 * Allocate new duphead. Swap xde with duphead to avoid
1016 * adding/removing elements with the same hash.
1018 MPASS(!tmpfs_dirent_dup(xde));
1019 tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), NULL, NULL, 0,
1021 /* *nde = *xde; XXX gcc 4.2.1 may generate invalid code. */
1022 memcpy(nde, xde, sizeof(*xde));
1023 xde->td_cookie |= TMPFS_DIRCOOKIE_DUPHEAD;
1024 LIST_INIT(&xde->ud.td_duphead);
1025 xde->td_namelen = 0;
1026 xde->td_node = NULL;
1027 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, nde);
1028 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
1030 dnode->tn_size += sizeof(struct tmpfs_dirent);
1031 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1032 TMPFS_NODE_MODIFIED;
1037 * Detaches the directory entry de from the directory represented by vp.
1038 * Note that this does not change the link count of the node pointed by
1039 * the directory entry, as this is done by tmpfs_free_dirent.
1042 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de)
1044 struct tmpfs_mount *tmp;
1045 struct tmpfs_dir *head;
1046 struct tmpfs_node *dnode;
1047 struct tmpfs_dirent *xde;
1049 ASSERT_VOP_ELOCKED(vp, __func__);
1051 dnode = VP_TO_TMPFS_DIR(vp);
1052 head = &dnode->tn_dir.tn_dirhead;
1053 dnode->tn_dir.tn_readdir_lastn = 0;
1054 dnode->tn_dir.tn_readdir_lastp = NULL;
1056 if (tmpfs_dirent_dup(de)) {
1057 /* Remove duphead if de was last entry. */
1058 if (LIST_NEXT(de, uh.td_dup.entries) == NULL) {
1059 xde = tmpfs_dir_xlookup_hash(dnode, de->td_hash);
1060 MPASS(tmpfs_dirent_duphead(xde));
1063 LIST_REMOVE(de, uh.td_dup.entries);
1064 LIST_REMOVE(de, uh.td_dup.index_entries);
1066 if (LIST_EMPTY(&xde->ud.td_duphead)) {
1067 RB_REMOVE(tmpfs_dir, head, xde);
1068 tmp = VFS_TO_TMPFS(vp->v_mount);
1069 MPASS(xde->td_node == NULL);
1070 tmpfs_free_dirent(tmp, xde);
1073 de->td_cookie = de->td_hash;
1075 RB_REMOVE(tmpfs_dir, head, de);
1077 dnode->tn_size -= sizeof(struct tmpfs_dirent);
1078 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1079 TMPFS_NODE_MODIFIED;
1084 tmpfs_dir_destroy(struct tmpfs_mount *tmp, struct tmpfs_node *dnode)
1086 struct tmpfs_dirent *de, *dde, *nde;
1088 RB_FOREACH_SAFE(de, tmpfs_dir, &dnode->tn_dir.tn_dirhead, nde) {
1089 RB_REMOVE(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
1090 /* Node may already be destroyed. */
1092 if (tmpfs_dirent_duphead(de)) {
1093 while ((dde = LIST_FIRST(&de->ud.td_duphead)) != NULL) {
1094 LIST_REMOVE(dde, uh.td_dup.entries);
1095 dde->td_node = NULL;
1096 tmpfs_free_dirent(tmp, dde);
1099 tmpfs_free_dirent(tmp, de);
1104 * Helper function for tmpfs_readdir. Creates a '.' entry for the given
1105 * directory and returns it in the uio space. The function returns 0
1106 * on success, -1 if there was not enough space in the uio structure to
1107 * hold the directory entry or an appropriate error code if another
1111 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio)
1116 TMPFS_VALIDATE_DIR(node);
1117 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT);
1119 dent.d_fileno = node->tn_id;
1120 dent.d_type = DT_DIR;
1122 dent.d_name[0] = '.';
1123 dent.d_reclen = GENERIC_DIRSIZ(&dent);
1124 dirent_terminate(&dent);
1126 if (dent.d_reclen > uio->uio_resid)
1127 error = EJUSTRETURN;
1129 error = uiomove(&dent, dent.d_reclen, uio);
1131 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1137 * Helper function for tmpfs_readdir. Creates a '..' entry for the given
1138 * directory and returns it in the uio space. The function returns 0
1139 * on success, -1 if there was not enough space in the uio structure to
1140 * hold the directory entry or an appropriate error code if another
1144 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio)
1149 TMPFS_VALIDATE_DIR(node);
1150 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
1153 * Return ENOENT if the current node is already removed.
1155 TMPFS_ASSERT_LOCKED(node);
1156 if (node->tn_dir.tn_parent == NULL)
1159 TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
1160 dent.d_fileno = node->tn_dir.tn_parent->tn_id;
1161 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent);
1163 dent.d_type = DT_DIR;
1165 dent.d_name[0] = '.';
1166 dent.d_name[1] = '.';
1167 dent.d_reclen = GENERIC_DIRSIZ(&dent);
1168 dirent_terminate(&dent);
1170 if (dent.d_reclen > uio->uio_resid)
1171 error = EJUSTRETURN;
1173 error = uiomove(&dent, dent.d_reclen, uio);
1175 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1181 * Helper function for tmpfs_readdir. Returns as much directory entries
1182 * as can fit in the uio space. The read starts at uio->uio_offset.
1183 * The function returns 0 on success, -1 if there was not enough space
1184 * in the uio structure to hold the directory entry or an appropriate
1185 * error code if another error happens.
1188 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, int maxcookies,
1189 u_long *cookies, int *ncookies)
1191 struct tmpfs_dir_cursor dc;
1192 struct tmpfs_dirent *de;
1196 TMPFS_VALIDATE_DIR(node);
1201 * Lookup the node from the current offset. The starting offset of
1202 * 0 will lookup both '.' and '..', and then the first real entry,
1203 * or EOF if there are none. Then find all entries for the dir that
1204 * fit into the buffer. Once no more entries are found (de == NULL),
1205 * the offset is set to TMPFS_DIRCOOKIE_EOF, which will cause the next
1208 switch (uio->uio_offset) {
1209 case TMPFS_DIRCOOKIE_DOT:
1210 error = tmpfs_dir_getdotdent(node, uio);
1213 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT;
1214 if (cookies != NULL)
1215 cookies[(*ncookies)++] = off = uio->uio_offset;
1217 case TMPFS_DIRCOOKIE_DOTDOT:
1218 error = tmpfs_dir_getdotdotdent(node, uio);
1221 de = tmpfs_dir_first(node, &dc);
1222 uio->uio_offset = tmpfs_dirent_cookie(de);
1223 if (cookies != NULL)
1224 cookies[(*ncookies)++] = off = uio->uio_offset;
1229 case TMPFS_DIRCOOKIE_EOF:
1232 de = tmpfs_dir_lookup_cookie(node, uio->uio_offset, &dc);
1235 if (cookies != NULL)
1236 off = tmpfs_dirent_cookie(de);
1239 /* Read as much entries as possible; i.e., until we reach the end of
1240 * the directory or we exhaust uio space. */
1244 /* Create a dirent structure representing the current
1245 * tmpfs_node and fill it. */
1246 if (de->td_node == NULL) {
1250 d.d_fileno = de->td_node->tn_id;
1251 switch (de->td_node->tn_type) {
1281 panic("tmpfs_dir_getdents: type %p %d",
1282 de->td_node, (int)de->td_node->tn_type);
1285 d.d_namlen = de->td_namelen;
1286 MPASS(de->td_namelen < sizeof(d.d_name));
1287 (void)memcpy(d.d_name, de->ud.td_name, de->td_namelen);
1288 d.d_reclen = GENERIC_DIRSIZ(&d);
1289 dirent_terminate(&d);
1291 /* Stop reading if the directory entry we are treating is
1292 * bigger than the amount of data that can be returned. */
1293 if (d.d_reclen > uio->uio_resid) {
1294 error = EJUSTRETURN;
1298 /* Copy the new dirent structure into the output buffer and
1299 * advance pointers. */
1300 error = uiomove(&d, d.d_reclen, uio);
1302 de = tmpfs_dir_next(node, &dc);
1303 if (cookies != NULL) {
1304 off = tmpfs_dirent_cookie(de);
1305 MPASS(*ncookies < maxcookies);
1306 cookies[(*ncookies)++] = off;
1309 } while (error == 0 && uio->uio_resid > 0 && de != NULL);
1311 /* Skip setting off when using cookies as it is already done above. */
1312 if (cookies == NULL)
1313 off = tmpfs_dirent_cookie(de);
1315 /* Update the offset and cache. */
1316 uio->uio_offset = off;
1317 node->tn_dir.tn_readdir_lastn = off;
1318 node->tn_dir.tn_readdir_lastp = de;
1320 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1325 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp)
1327 struct tmpfs_dirent *de;
1330 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL,
1331 cnp->cn_nameptr, cnp->cn_namelen, &de);
1334 tmpfs_dir_attach(dvp, de);
1339 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp)
1341 struct tmpfs_dirent *de;
1343 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1344 MPASS(de != NULL && de->td_node == NULL);
1345 tmpfs_dir_detach(dvp, de);
1346 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de);
1350 * Resizes the aobj associated with the regular file pointed to by 'vp' to the
1351 * size 'newsize'. 'vp' must point to a vnode that represents a regular file.
1352 * 'newsize' must be positive.
1354 * Returns zero on success or an appropriate error code on failure.
1357 tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr)
1359 struct tmpfs_mount *tmp;
1360 struct tmpfs_node *node;
1363 vm_pindex_t idx, newpages, oldpages;
1367 MPASS(vp->v_type == VREG);
1368 MPASS(newsize >= 0);
1370 node = VP_TO_TMPFS_NODE(vp);
1371 uobj = node->tn_reg.tn_aobj;
1372 tmp = VFS_TO_TMPFS(vp->v_mount);
1375 * Convert the old and new sizes to the number of pages needed to
1376 * store them. It may happen that we do not need to do anything
1377 * because the last allocated page can accommodate the change on
1380 oldsize = node->tn_size;
1381 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK);
1382 MPASS(oldpages == uobj->size);
1383 newpages = OFF_TO_IDX(newsize + PAGE_MASK);
1385 if (__predict_true(newpages == oldpages && newsize >= oldsize)) {
1386 node->tn_size = newsize;
1390 if (newpages > oldpages &&
1391 tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0)
1394 VM_OBJECT_WLOCK(uobj);
1395 if (newsize < oldsize) {
1397 * Zero the truncated part of the last page.
1399 base = newsize & PAGE_MASK;
1401 idx = OFF_TO_IDX(newsize);
1403 m = vm_page_lookup(uobj, idx);
1405 if (vm_page_sleep_if_busy(m, "tmfssz"))
1407 MPASS(m->valid == VM_PAGE_BITS_ALL);
1408 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) {
1409 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL |
1413 rv = vm_pager_get_pages(uobj, &m, 1, NULL,
1416 if (rv == VM_PAGER_OK) {
1418 * Since the page was not resident,
1419 * and therefore not recently
1420 * accessed, immediately enqueue it
1421 * for asynchronous laundering. The
1422 * current operation is not regarded
1434 VM_OBJECT_WUNLOCK(uobj);
1440 pmap_zero_page_area(m, base, PAGE_SIZE - base);
1442 vm_pager_page_unswapped(m);
1447 * Release any swap space and free any whole pages.
1449 if (newpages < oldpages) {
1450 swap_pager_freespace(uobj, newpages, oldpages -
1452 vm_object_page_remove(uobj, newpages, 0, 0);
1455 uobj->size = newpages;
1456 VM_OBJECT_WUNLOCK(uobj);
1458 atomic_add_long(&tmp->tm_pages_used, newpages - oldpages);
1460 node->tn_size = newsize;
1465 tmpfs_check_mtime(struct vnode *vp)
1467 struct tmpfs_node *node;
1468 struct vm_object *obj;
1470 ASSERT_VOP_ELOCKED(vp, "check_mtime");
1471 if (vp->v_type != VREG)
1474 KASSERT((obj->flags & (OBJ_TMPFS_NODE | OBJ_TMPFS)) ==
1475 (OBJ_TMPFS_NODE | OBJ_TMPFS), ("non-tmpfs obj"));
1477 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) {
1478 VM_OBJECT_WLOCK(obj);
1479 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) {
1480 obj->flags &= ~OBJ_TMPFS_DIRTY;
1481 node = VP_TO_TMPFS_NODE(vp);
1482 node->tn_status |= TMPFS_NODE_MODIFIED |
1485 VM_OBJECT_WUNLOCK(obj);
1490 * Change flags of the given vnode.
1491 * Caller should execute tmpfs_update on vp after a successful execution.
1492 * The vnode must be locked on entry and remain locked on exit.
1495 tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred,
1499 struct tmpfs_node *node;
1501 ASSERT_VOP_ELOCKED(vp, "chflags");
1503 node = VP_TO_TMPFS_NODE(vp);
1505 if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK |
1506 UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP |
1507 UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
1508 UF_SPARSE | UF_SYSTEM)) != 0)
1509 return (EOPNOTSUPP);
1511 /* Disallow this operation if the file system is mounted read-only. */
1512 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1516 * Callers may only modify the file flags on objects they
1517 * have VADMIN rights for.
1519 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1522 * Unprivileged processes are not permitted to unset system
1523 * flags, or modify flags if any system flags are set.
1525 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
1526 if (node->tn_flags &
1527 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
1528 error = securelevel_gt(cred, 0);
1533 if (node->tn_flags &
1534 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
1535 ((flags ^ node->tn_flags) & SF_SETTABLE))
1538 node->tn_flags = flags;
1539 node->tn_status |= TMPFS_NODE_CHANGED;
1541 ASSERT_VOP_ELOCKED(vp, "chflags2");
1547 * Change access mode on the given vnode.
1548 * Caller should execute tmpfs_update on vp after a successful execution.
1549 * The vnode must be locked on entry and remain locked on exit.
1552 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p)
1555 struct tmpfs_node *node;
1557 ASSERT_VOP_ELOCKED(vp, "chmod");
1559 node = VP_TO_TMPFS_NODE(vp);
1561 /* Disallow this operation if the file system is mounted read-only. */
1562 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1565 /* Immutable or append-only files cannot be modified, either. */
1566 if (node->tn_flags & (IMMUTABLE | APPEND))
1570 * To modify the permissions on a file, must possess VADMIN
1573 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1577 * Privileged processes may set the sticky bit on non-directories,
1578 * as well as set the setgid bit on a file with a group that the
1579 * process is not a member of.
1581 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
1582 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
1585 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) {
1586 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
1592 node->tn_mode &= ~ALLPERMS;
1593 node->tn_mode |= mode & ALLPERMS;
1595 node->tn_status |= TMPFS_NODE_CHANGED;
1597 ASSERT_VOP_ELOCKED(vp, "chmod2");
1603 * Change ownership of the given vnode. At least one of uid or gid must
1604 * be different than VNOVAL. If one is set to that value, the attribute
1606 * Caller should execute tmpfs_update on vp after a successful execution.
1607 * The vnode must be locked on entry and remain locked on exit.
1610 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
1614 struct tmpfs_node *node;
1618 ASSERT_VOP_ELOCKED(vp, "chown");
1620 node = VP_TO_TMPFS_NODE(vp);
1622 /* Assign default values if they are unknown. */
1623 MPASS(uid != VNOVAL || gid != VNOVAL);
1628 MPASS(uid != VNOVAL && gid != VNOVAL);
1630 /* Disallow this operation if the file system is mounted read-only. */
1631 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1634 /* Immutable or append-only files cannot be modified, either. */
1635 if (node->tn_flags & (IMMUTABLE | APPEND))
1639 * To modify the ownership of a file, must possess VADMIN for that
1642 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1646 * To change the owner of a file, or change the group of a file to a
1647 * group of which we are not a member, the caller must have
1650 if ((uid != node->tn_uid ||
1651 (gid != node->tn_gid && !groupmember(gid, cred))) &&
1652 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
1655 ogid = node->tn_gid;
1656 ouid = node->tn_uid;
1661 node->tn_status |= TMPFS_NODE_CHANGED;
1663 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) {
1664 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0))
1665 node->tn_mode &= ~(S_ISUID | S_ISGID);
1668 ASSERT_VOP_ELOCKED(vp, "chown2");
1674 * Change size of the given vnode.
1675 * Caller should execute tmpfs_update on vp after a successful execution.
1676 * The vnode must be locked on entry and remain locked on exit.
1679 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred,
1683 struct tmpfs_node *node;
1685 ASSERT_VOP_ELOCKED(vp, "chsize");
1687 node = VP_TO_TMPFS_NODE(vp);
1689 /* Decide whether this is a valid operation based on the file type. */
1691 switch (vp->v_type) {
1696 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1705 /* Allow modifications of special files even if in the file
1706 * system is mounted read-only (we are not modifying the
1707 * files themselves, but the objects they represent). */
1711 /* Anything else is unsupported. */
1715 /* Immutable or append-only files cannot be modified, either. */
1716 if (node->tn_flags & (IMMUTABLE | APPEND))
1719 error = tmpfs_truncate(vp, size);
1720 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents
1721 * for us, as will update tn_status; no need to do that here. */
1723 ASSERT_VOP_ELOCKED(vp, "chsize2");
1729 * Change access and modification times of the given vnode.
1730 * Caller should execute tmpfs_update on vp after a successful execution.
1731 * The vnode must be locked on entry and remain locked on exit.
1734 tmpfs_chtimes(struct vnode *vp, struct vattr *vap,
1735 struct ucred *cred, struct thread *l)
1738 struct tmpfs_node *node;
1740 ASSERT_VOP_ELOCKED(vp, "chtimes");
1742 node = VP_TO_TMPFS_NODE(vp);
1744 /* Disallow this operation if the file system is mounted read-only. */
1745 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1748 /* Immutable or append-only files cannot be modified, either. */
1749 if (node->tn_flags & (IMMUTABLE | APPEND))
1752 error = vn_utimes_perm(vp, vap, cred, l);
1756 if (vap->va_atime.tv_sec != VNOVAL)
1757 node->tn_status |= TMPFS_NODE_ACCESSED;
1759 if (vap->va_mtime.tv_sec != VNOVAL)
1760 node->tn_status |= TMPFS_NODE_MODIFIED;
1762 if (vap->va_birthtime.tv_sec != VNOVAL)
1763 node->tn_status |= TMPFS_NODE_MODIFIED;
1765 tmpfs_itimes(vp, &vap->va_atime, &vap->va_mtime);
1767 if (vap->va_birthtime.tv_sec != VNOVAL)
1768 node->tn_birthtime = vap->va_birthtime;
1769 ASSERT_VOP_ELOCKED(vp, "chtimes2");
1775 tmpfs_set_status(struct tmpfs_node *node, int status)
1778 if ((node->tn_status & status) == status)
1780 TMPFS_NODE_LOCK(node);
1781 node->tn_status |= status;
1782 TMPFS_NODE_UNLOCK(node);
1785 /* Sync timestamps */
1787 tmpfs_itimes(struct vnode *vp, const struct timespec *acc,
1788 const struct timespec *mod)
1790 struct tmpfs_node *node;
1791 struct timespec now;
1793 ASSERT_VOP_LOCKED(vp, "tmpfs_itimes");
1794 node = VP_TO_TMPFS_NODE(vp);
1796 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
1797 TMPFS_NODE_CHANGED)) == 0)
1800 vfs_timestamp(&now);
1801 TMPFS_NODE_LOCK(node);
1802 if (node->tn_status & TMPFS_NODE_ACCESSED) {
1805 node->tn_atime = *acc;
1807 if (node->tn_status & TMPFS_NODE_MODIFIED) {
1810 node->tn_mtime = *mod;
1812 if (node->tn_status & TMPFS_NODE_CHANGED)
1813 node->tn_ctime = now;
1814 node->tn_status &= ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
1815 TMPFS_NODE_CHANGED);
1816 TMPFS_NODE_UNLOCK(node);
1818 /* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */
1819 random_harvest_queue(node, sizeof(*node), RANDOM_FS_ATIME);
1823 tmpfs_update(struct vnode *vp)
1826 tmpfs_itimes(vp, NULL, NULL);
1830 tmpfs_truncate(struct vnode *vp, off_t length)
1833 struct tmpfs_node *node;
1835 node = VP_TO_TMPFS_NODE(vp);
1842 if (node->tn_size == length) {
1847 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
1850 error = tmpfs_reg_resize(vp, length, FALSE);
1852 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1861 tmpfs_dirtree_cmp(struct tmpfs_dirent *a, struct tmpfs_dirent *b)
1863 if (a->td_hash > b->td_hash)
1865 else if (a->td_hash < b->td_hash)
1870 RB_GENERATE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);